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 strlcpy(req->module, module_name, MODULE_NAME_LEN); 746 list_add_tail(&req->list, &nft_net->module_list); 747 748 return -EAGAIN; 749 } 750 EXPORT_SYMBOL_GPL(nft_request_module); 751 #endif 752 753 static void lockdep_nfnl_nft_mutex_not_held(void) 754 { 755 #ifdef CONFIG_PROVE_LOCKING 756 if (debug_locks) 757 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES)); 758 #endif 759 } 760 761 static const struct nft_chain_type * 762 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla, 763 u8 family, bool autoload) 764 { 765 const struct nft_chain_type *type; 766 767 type = __nf_tables_chain_type_lookup(nla, family); 768 if (type != NULL) 769 return type; 770 771 lockdep_nfnl_nft_mutex_not_held(); 772 #ifdef CONFIG_MODULES 773 if (autoload) { 774 if (nft_request_module(net, "nft-chain-%u-%.*s", family, 775 nla_len(nla), 776 (const char *)nla_data(nla)) == -EAGAIN) 777 return ERR_PTR(-EAGAIN); 778 } 779 #endif 780 return ERR_PTR(-ENOENT); 781 } 782 783 static __be16 nft_base_seq(const struct net *net) 784 { 785 struct nftables_pernet *nft_net = nft_pernet(net); 786 787 return htons(nft_net->base_seq & 0xffff); 788 } 789 790 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { 791 [NFTA_TABLE_NAME] = { .type = NLA_STRING, 792 .len = NFT_TABLE_MAXNAMELEN - 1 }, 793 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, 794 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 }, 795 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY, 796 .len = NFT_USERDATA_MAXLEN } 797 }; 798 799 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, 800 u32 portid, u32 seq, int event, u32 flags, 801 int family, const struct nft_table *table) 802 { 803 struct nlmsghdr *nlh; 804 805 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 806 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 807 NFNETLINK_V0, nft_base_seq(net)); 808 if (!nlh) 809 goto nla_put_failure; 810 811 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || 812 nla_put_be32(skb, NFTA_TABLE_FLAGS, 813 htonl(table->flags & NFT_TABLE_F_MASK)) || 814 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) || 815 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle), 816 NFTA_TABLE_PAD)) 817 goto nla_put_failure; 818 if (nft_table_has_owner(table) && 819 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid))) 820 goto nla_put_failure; 821 822 if (table->udata) { 823 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata)) 824 goto nla_put_failure; 825 } 826 827 nlmsg_end(skb, nlh); 828 return 0; 829 830 nla_put_failure: 831 nlmsg_trim(skb, nlh); 832 return -1; 833 } 834 835 struct nftnl_skb_parms { 836 bool report; 837 }; 838 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb)) 839 840 static void nft_notify_enqueue(struct sk_buff *skb, bool report, 841 struct list_head *notify_list) 842 { 843 NFT_CB(skb).report = report; 844 list_add_tail(&skb->list, notify_list); 845 } 846 847 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event) 848 { 849 struct nftables_pernet *nft_net; 850 struct sk_buff *skb; 851 u16 flags = 0; 852 int err; 853 854 if (!ctx->report && 855 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 856 return; 857 858 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 859 if (skb == NULL) 860 goto err; 861 862 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 863 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 864 865 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, 866 event, flags, ctx->family, ctx->table); 867 if (err < 0) { 868 kfree_skb(skb); 869 goto err; 870 } 871 872 nft_net = nft_pernet(ctx->net); 873 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 874 return; 875 err: 876 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 877 } 878 879 static int nf_tables_dump_tables(struct sk_buff *skb, 880 struct netlink_callback *cb) 881 { 882 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 883 struct nftables_pernet *nft_net; 884 const struct nft_table *table; 885 unsigned int idx = 0, s_idx = cb->args[0]; 886 struct net *net = sock_net(skb->sk); 887 int family = nfmsg->nfgen_family; 888 889 rcu_read_lock(); 890 nft_net = nft_pernet(net); 891 cb->seq = 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 return -EOPNOTSUPP; 2171 2172 flow_block_init(&basechain->flow_block); 2173 2174 return 0; 2175 } 2176 2177 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain) 2178 { 2179 int err; 2180 2181 err = rhltable_insert_key(&table->chains_ht, chain->name, 2182 &chain->rhlhead, nft_chain_ht_params); 2183 if (err) 2184 return err; 2185 2186 list_add_tail_rcu(&chain->list, &table->chains); 2187 2188 return 0; 2189 } 2190 2191 static u64 chain_id; 2192 2193 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask, 2194 u8 policy, u32 flags, 2195 struct netlink_ext_ack *extack) 2196 { 2197 const struct nlattr * const *nla = ctx->nla; 2198 struct nft_stats __percpu *stats = NULL; 2199 struct nft_table *table = ctx->table; 2200 struct nft_base_chain *basechain; 2201 struct net *net = ctx->net; 2202 char name[NFT_NAME_MAXLEN]; 2203 struct nft_rule_blob *blob; 2204 struct nft_trans *trans; 2205 struct nft_chain *chain; 2206 unsigned int data_size; 2207 int err; 2208 2209 if (table->use == UINT_MAX) 2210 return -EOVERFLOW; 2211 2212 if (nla[NFTA_CHAIN_HOOK]) { 2213 struct nft_chain_hook hook; 2214 2215 if (flags & NFT_CHAIN_BINDING) 2216 return -EOPNOTSUPP; 2217 2218 err = nft_chain_parse_hook(net, nla, &hook, family, extack, 2219 true); 2220 if (err < 0) 2221 return err; 2222 2223 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT); 2224 if (basechain == NULL) { 2225 nft_chain_release_hook(&hook); 2226 return -ENOMEM; 2227 } 2228 chain = &basechain->chain; 2229 2230 if (nla[NFTA_CHAIN_COUNTERS]) { 2231 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); 2232 if (IS_ERR(stats)) { 2233 nft_chain_release_hook(&hook); 2234 kfree(basechain); 2235 return PTR_ERR(stats); 2236 } 2237 rcu_assign_pointer(basechain->stats, stats); 2238 } 2239 2240 err = nft_basechain_init(basechain, family, &hook, flags); 2241 if (err < 0) { 2242 nft_chain_release_hook(&hook); 2243 kfree(basechain); 2244 return err; 2245 } 2246 } else { 2247 if (flags & NFT_CHAIN_BASE) 2248 return -EINVAL; 2249 if (flags & NFT_CHAIN_HW_OFFLOAD) 2250 return -EOPNOTSUPP; 2251 2252 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT); 2253 if (chain == NULL) 2254 return -ENOMEM; 2255 2256 chain->flags = flags; 2257 } 2258 ctx->chain = chain; 2259 2260 INIT_LIST_HEAD(&chain->rules); 2261 chain->handle = nf_tables_alloc_handle(table); 2262 chain->table = table; 2263 2264 if (nla[NFTA_CHAIN_NAME]) { 2265 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT); 2266 } else { 2267 if (!(flags & NFT_CHAIN_BINDING)) { 2268 err = -EINVAL; 2269 goto err_destroy_chain; 2270 } 2271 2272 snprintf(name, sizeof(name), "__chain%llu", ++chain_id); 2273 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT); 2274 } 2275 2276 if (!chain->name) { 2277 err = -ENOMEM; 2278 goto err_destroy_chain; 2279 } 2280 2281 if (nla[NFTA_CHAIN_USERDATA]) { 2282 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT); 2283 if (chain->udata == NULL) { 2284 err = -ENOMEM; 2285 goto err_destroy_chain; 2286 } 2287 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]); 2288 } 2289 2290 data_size = offsetof(struct nft_rule_dp, data); /* last rule */ 2291 blob = nf_tables_chain_alloc_rules(data_size); 2292 if (!blob) { 2293 err = -ENOMEM; 2294 goto err_destroy_chain; 2295 } 2296 2297 RCU_INIT_POINTER(chain->blob_gen_0, blob); 2298 RCU_INIT_POINTER(chain->blob_gen_1, blob); 2299 2300 err = nf_tables_register_hook(net, table, chain); 2301 if (err < 0) 2302 goto err_destroy_chain; 2303 2304 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN); 2305 if (IS_ERR(trans)) { 2306 err = PTR_ERR(trans); 2307 goto err_unregister_hook; 2308 } 2309 2310 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET; 2311 if (nft_is_base_chain(chain)) 2312 nft_trans_chain_policy(trans) = policy; 2313 2314 err = nft_chain_add(table, chain); 2315 if (err < 0) { 2316 nft_trans_destroy(trans); 2317 goto err_unregister_hook; 2318 } 2319 2320 if (stats) 2321 static_branch_inc(&nft_counters_enabled); 2322 2323 table->use++; 2324 2325 return 0; 2326 err_unregister_hook: 2327 nf_tables_unregister_hook(net, table, chain); 2328 err_destroy_chain: 2329 nf_tables_chain_destroy(ctx); 2330 2331 return err; 2332 } 2333 2334 static bool nft_hook_list_equal(struct list_head *hook_list1, 2335 struct list_head *hook_list2) 2336 { 2337 struct nft_hook *hook; 2338 int n = 0, m = 0; 2339 2340 n = 0; 2341 list_for_each_entry(hook, hook_list2, list) { 2342 if (!nft_hook_list_find(hook_list1, hook)) 2343 return false; 2344 2345 n++; 2346 } 2347 list_for_each_entry(hook, hook_list1, list) 2348 m++; 2349 2350 return n == m; 2351 } 2352 2353 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy, 2354 u32 flags, const struct nlattr *attr, 2355 struct netlink_ext_ack *extack) 2356 { 2357 const struct nlattr * const *nla = ctx->nla; 2358 struct nft_table *table = ctx->table; 2359 struct nft_chain *chain = ctx->chain; 2360 struct nft_base_chain *basechain; 2361 struct nft_stats *stats = NULL; 2362 struct nft_chain_hook hook; 2363 struct nf_hook_ops *ops; 2364 struct nft_trans *trans; 2365 int err; 2366 2367 if (chain->flags ^ flags) 2368 return -EOPNOTSUPP; 2369 2370 if (nla[NFTA_CHAIN_HOOK]) { 2371 if (!nft_is_base_chain(chain)) { 2372 NL_SET_BAD_ATTR(extack, attr); 2373 return -EEXIST; 2374 } 2375 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family, 2376 extack, false); 2377 if (err < 0) 2378 return err; 2379 2380 basechain = nft_base_chain(chain); 2381 if (basechain->type != hook.type) { 2382 nft_chain_release_hook(&hook); 2383 NL_SET_BAD_ATTR(extack, attr); 2384 return -EEXIST; 2385 } 2386 2387 if (nft_base_chain_netdev(ctx->family, hook.num)) { 2388 if (!nft_hook_list_equal(&basechain->hook_list, 2389 &hook.list)) { 2390 nft_chain_release_hook(&hook); 2391 NL_SET_BAD_ATTR(extack, attr); 2392 return -EEXIST; 2393 } 2394 } else { 2395 ops = &basechain->ops; 2396 if (ops->hooknum != hook.num || 2397 ops->priority != hook.priority) { 2398 nft_chain_release_hook(&hook); 2399 NL_SET_BAD_ATTR(extack, attr); 2400 return -EEXIST; 2401 } 2402 } 2403 nft_chain_release_hook(&hook); 2404 } 2405 2406 if (nla[NFTA_CHAIN_HANDLE] && 2407 nla[NFTA_CHAIN_NAME]) { 2408 struct nft_chain *chain2; 2409 2410 chain2 = nft_chain_lookup(ctx->net, table, 2411 nla[NFTA_CHAIN_NAME], genmask); 2412 if (!IS_ERR(chain2)) { 2413 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); 2414 return -EEXIST; 2415 } 2416 } 2417 2418 if (nla[NFTA_CHAIN_COUNTERS]) { 2419 if (!nft_is_base_chain(chain)) 2420 return -EOPNOTSUPP; 2421 2422 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); 2423 if (IS_ERR(stats)) 2424 return PTR_ERR(stats); 2425 } 2426 2427 err = -ENOMEM; 2428 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, 2429 sizeof(struct nft_trans_chain)); 2430 if (trans == NULL) 2431 goto err; 2432 2433 nft_trans_chain_stats(trans) = stats; 2434 nft_trans_chain_update(trans) = true; 2435 2436 if (nla[NFTA_CHAIN_POLICY]) 2437 nft_trans_chain_policy(trans) = policy; 2438 else 2439 nft_trans_chain_policy(trans) = -1; 2440 2441 if (nla[NFTA_CHAIN_HANDLE] && 2442 nla[NFTA_CHAIN_NAME]) { 2443 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 2444 struct nft_trans *tmp; 2445 char *name; 2446 2447 err = -ENOMEM; 2448 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT); 2449 if (!name) 2450 goto err; 2451 2452 err = -EEXIST; 2453 list_for_each_entry(tmp, &nft_net->commit_list, list) { 2454 if (tmp->msg_type == NFT_MSG_NEWCHAIN && 2455 tmp->ctx.table == table && 2456 nft_trans_chain_update(tmp) && 2457 nft_trans_chain_name(tmp) && 2458 strcmp(name, nft_trans_chain_name(tmp)) == 0) { 2459 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); 2460 kfree(name); 2461 goto err; 2462 } 2463 } 2464 2465 nft_trans_chain_name(trans) = name; 2466 } 2467 nft_trans_commit_list_add_tail(ctx->net, trans); 2468 2469 return 0; 2470 err: 2471 free_percpu(stats); 2472 kfree(trans); 2473 return err; 2474 } 2475 2476 static struct nft_chain *nft_chain_lookup_byid(const struct net *net, 2477 const struct nft_table *table, 2478 const struct nlattr *nla) 2479 { 2480 struct nftables_pernet *nft_net = nft_pernet(net); 2481 u32 id = ntohl(nla_get_be32(nla)); 2482 struct nft_trans *trans; 2483 2484 list_for_each_entry(trans, &nft_net->commit_list, list) { 2485 struct nft_chain *chain = trans->ctx.chain; 2486 2487 if (trans->msg_type == NFT_MSG_NEWCHAIN && 2488 chain->table == table && 2489 id == nft_trans_chain_id(trans)) 2490 return chain; 2491 } 2492 return ERR_PTR(-ENOENT); 2493 } 2494 2495 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info, 2496 const struct nlattr * const nla[]) 2497 { 2498 struct nftables_pernet *nft_net = nft_pernet(info->net); 2499 struct netlink_ext_ack *extack = info->extack; 2500 u8 genmask = nft_genmask_next(info->net); 2501 u8 family = info->nfmsg->nfgen_family; 2502 struct nft_chain *chain = NULL; 2503 struct net *net = info->net; 2504 const struct nlattr *attr; 2505 struct nft_table *table; 2506 u8 policy = NF_ACCEPT; 2507 struct nft_ctx ctx; 2508 u64 handle = 0; 2509 u32 flags = 0; 2510 2511 lockdep_assert_held(&nft_net->commit_mutex); 2512 2513 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 2514 NETLINK_CB(skb).portid); 2515 if (IS_ERR(table)) { 2516 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); 2517 return PTR_ERR(table); 2518 } 2519 2520 chain = NULL; 2521 attr = nla[NFTA_CHAIN_NAME]; 2522 2523 if (nla[NFTA_CHAIN_HANDLE]) { 2524 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); 2525 chain = nft_chain_lookup_byhandle(table, handle, genmask); 2526 if (IS_ERR(chain)) { 2527 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]); 2528 return PTR_ERR(chain); 2529 } 2530 attr = nla[NFTA_CHAIN_HANDLE]; 2531 } else if (nla[NFTA_CHAIN_NAME]) { 2532 chain = nft_chain_lookup(net, table, attr, genmask); 2533 if (IS_ERR(chain)) { 2534 if (PTR_ERR(chain) != -ENOENT) { 2535 NL_SET_BAD_ATTR(extack, attr); 2536 return PTR_ERR(chain); 2537 } 2538 chain = NULL; 2539 } 2540 } else if (!nla[NFTA_CHAIN_ID]) { 2541 return -EINVAL; 2542 } 2543 2544 if (nla[NFTA_CHAIN_POLICY]) { 2545 if (chain != NULL && 2546 !nft_is_base_chain(chain)) { 2547 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); 2548 return -EOPNOTSUPP; 2549 } 2550 2551 if (chain == NULL && 2552 nla[NFTA_CHAIN_HOOK] == NULL) { 2553 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); 2554 return -EOPNOTSUPP; 2555 } 2556 2557 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); 2558 switch (policy) { 2559 case NF_DROP: 2560 case NF_ACCEPT: 2561 break; 2562 default: 2563 return -EINVAL; 2564 } 2565 } 2566 2567 if (nla[NFTA_CHAIN_FLAGS]) 2568 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS])); 2569 else if (chain) 2570 flags = chain->flags; 2571 2572 if (flags & ~NFT_CHAIN_FLAGS) 2573 return -EOPNOTSUPP; 2574 2575 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 2576 2577 if (chain != NULL) { 2578 if (chain->flags & NFT_CHAIN_BINDING) 2579 return -EINVAL; 2580 2581 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 2582 NL_SET_BAD_ATTR(extack, attr); 2583 return -EEXIST; 2584 } 2585 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 2586 return -EOPNOTSUPP; 2587 2588 flags |= chain->flags & NFT_CHAIN_BASE; 2589 return nf_tables_updchain(&ctx, genmask, policy, flags, attr, 2590 extack); 2591 } 2592 2593 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack); 2594 } 2595 2596 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info, 2597 const struct nlattr * const nla[]) 2598 { 2599 struct netlink_ext_ack *extack = info->extack; 2600 u8 genmask = nft_genmask_next(info->net); 2601 u8 family = info->nfmsg->nfgen_family; 2602 struct net *net = info->net; 2603 const struct nlattr *attr; 2604 struct nft_table *table; 2605 struct nft_chain *chain; 2606 struct nft_rule *rule; 2607 struct nft_ctx ctx; 2608 u64 handle; 2609 u32 use; 2610 int err; 2611 2612 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 2613 NETLINK_CB(skb).portid); 2614 if (IS_ERR(table)) { 2615 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); 2616 return PTR_ERR(table); 2617 } 2618 2619 if (nla[NFTA_CHAIN_HANDLE]) { 2620 attr = nla[NFTA_CHAIN_HANDLE]; 2621 handle = be64_to_cpu(nla_get_be64(attr)); 2622 chain = nft_chain_lookup_byhandle(table, handle, genmask); 2623 } else { 2624 attr = nla[NFTA_CHAIN_NAME]; 2625 chain = nft_chain_lookup(net, table, attr, genmask); 2626 } 2627 if (IS_ERR(chain)) { 2628 NL_SET_BAD_ATTR(extack, attr); 2629 return PTR_ERR(chain); 2630 } 2631 2632 if (info->nlh->nlmsg_flags & NLM_F_NONREC && 2633 chain->use > 0) 2634 return -EBUSY; 2635 2636 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 2637 2638 use = chain->use; 2639 list_for_each_entry(rule, &chain->rules, list) { 2640 if (!nft_is_active_next(net, rule)) 2641 continue; 2642 use--; 2643 2644 err = nft_delrule(&ctx, rule); 2645 if (err < 0) 2646 return err; 2647 } 2648 2649 /* There are rules and elements that are still holding references to us, 2650 * we cannot do a recursive removal in this case. 2651 */ 2652 if (use > 0) { 2653 NL_SET_BAD_ATTR(extack, attr); 2654 return -EBUSY; 2655 } 2656 2657 return nft_delchain(&ctx); 2658 } 2659 2660 /* 2661 * Expressions 2662 */ 2663 2664 /** 2665 * nft_register_expr - register nf_tables expr type 2666 * @type: expr type 2667 * 2668 * Registers the expr type for use with nf_tables. Returns zero on 2669 * success or a negative errno code otherwise. 2670 */ 2671 int nft_register_expr(struct nft_expr_type *type) 2672 { 2673 nfnl_lock(NFNL_SUBSYS_NFTABLES); 2674 if (type->family == NFPROTO_UNSPEC) 2675 list_add_tail_rcu(&type->list, &nf_tables_expressions); 2676 else 2677 list_add_rcu(&type->list, &nf_tables_expressions); 2678 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 2679 return 0; 2680 } 2681 EXPORT_SYMBOL_GPL(nft_register_expr); 2682 2683 /** 2684 * nft_unregister_expr - unregister nf_tables expr type 2685 * @type: expr type 2686 * 2687 * Unregisters the expr typefor use with nf_tables. 2688 */ 2689 void nft_unregister_expr(struct nft_expr_type *type) 2690 { 2691 nfnl_lock(NFNL_SUBSYS_NFTABLES); 2692 list_del_rcu(&type->list); 2693 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 2694 } 2695 EXPORT_SYMBOL_GPL(nft_unregister_expr); 2696 2697 static const struct nft_expr_type *__nft_expr_type_get(u8 family, 2698 struct nlattr *nla) 2699 { 2700 const struct nft_expr_type *type, *candidate = NULL; 2701 2702 list_for_each_entry(type, &nf_tables_expressions, list) { 2703 if (!nla_strcmp(nla, type->name)) { 2704 if (!type->family && !candidate) 2705 candidate = type; 2706 else if (type->family == family) 2707 candidate = type; 2708 } 2709 } 2710 return candidate; 2711 } 2712 2713 #ifdef CONFIG_MODULES 2714 static int nft_expr_type_request_module(struct net *net, u8 family, 2715 struct nlattr *nla) 2716 { 2717 if (nft_request_module(net, "nft-expr-%u-%.*s", family, 2718 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN) 2719 return -EAGAIN; 2720 2721 return 0; 2722 } 2723 #endif 2724 2725 static const struct nft_expr_type *nft_expr_type_get(struct net *net, 2726 u8 family, 2727 struct nlattr *nla) 2728 { 2729 const struct nft_expr_type *type; 2730 2731 if (nla == NULL) 2732 return ERR_PTR(-EINVAL); 2733 2734 type = __nft_expr_type_get(family, nla); 2735 if (type != NULL && try_module_get(type->owner)) 2736 return type; 2737 2738 lockdep_nfnl_nft_mutex_not_held(); 2739 #ifdef CONFIG_MODULES 2740 if (type == NULL) { 2741 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN) 2742 return ERR_PTR(-EAGAIN); 2743 2744 if (nft_request_module(net, "nft-expr-%.*s", 2745 nla_len(nla), 2746 (char *)nla_data(nla)) == -EAGAIN) 2747 return ERR_PTR(-EAGAIN); 2748 } 2749 #endif 2750 return ERR_PTR(-ENOENT); 2751 } 2752 2753 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { 2754 [NFTA_EXPR_NAME] = { .type = NLA_STRING, 2755 .len = NFT_MODULE_AUTOLOAD_LIMIT }, 2756 [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, 2757 }; 2758 2759 static int nf_tables_fill_expr_info(struct sk_buff *skb, 2760 const struct nft_expr *expr) 2761 { 2762 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) 2763 goto nla_put_failure; 2764 2765 if (expr->ops->dump) { 2766 struct nlattr *data = nla_nest_start_noflag(skb, 2767 NFTA_EXPR_DATA); 2768 if (data == NULL) 2769 goto nla_put_failure; 2770 if (expr->ops->dump(skb, expr) < 0) 2771 goto nla_put_failure; 2772 nla_nest_end(skb, data); 2773 } 2774 2775 return skb->len; 2776 2777 nla_put_failure: 2778 return -1; 2779 }; 2780 2781 int nft_expr_dump(struct sk_buff *skb, unsigned int attr, 2782 const struct nft_expr *expr) 2783 { 2784 struct nlattr *nest; 2785 2786 nest = nla_nest_start_noflag(skb, attr); 2787 if (!nest) 2788 goto nla_put_failure; 2789 if (nf_tables_fill_expr_info(skb, expr) < 0) 2790 goto nla_put_failure; 2791 nla_nest_end(skb, nest); 2792 return 0; 2793 2794 nla_put_failure: 2795 return -1; 2796 } 2797 2798 struct nft_expr_info { 2799 const struct nft_expr_ops *ops; 2800 const struct nlattr *attr; 2801 struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; 2802 }; 2803 2804 static int nf_tables_expr_parse(const struct nft_ctx *ctx, 2805 const struct nlattr *nla, 2806 struct nft_expr_info *info) 2807 { 2808 const struct nft_expr_type *type; 2809 const struct nft_expr_ops *ops; 2810 struct nlattr *tb[NFTA_EXPR_MAX + 1]; 2811 int err; 2812 2813 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla, 2814 nft_expr_policy, NULL); 2815 if (err < 0) 2816 return err; 2817 2818 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]); 2819 if (IS_ERR(type)) 2820 return PTR_ERR(type); 2821 2822 if (tb[NFTA_EXPR_DATA]) { 2823 err = nla_parse_nested_deprecated(info->tb, type->maxattr, 2824 tb[NFTA_EXPR_DATA], 2825 type->policy, NULL); 2826 if (err < 0) 2827 goto err1; 2828 } else 2829 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); 2830 2831 if (type->select_ops != NULL) { 2832 ops = type->select_ops(ctx, 2833 (const struct nlattr * const *)info->tb); 2834 if (IS_ERR(ops)) { 2835 err = PTR_ERR(ops); 2836 #ifdef CONFIG_MODULES 2837 if (err == -EAGAIN) 2838 if (nft_expr_type_request_module(ctx->net, 2839 ctx->family, 2840 tb[NFTA_EXPR_NAME]) != -EAGAIN) 2841 err = -ENOENT; 2842 #endif 2843 goto err1; 2844 } 2845 } else 2846 ops = type->ops; 2847 2848 info->attr = nla; 2849 info->ops = ops; 2850 2851 return 0; 2852 2853 err1: 2854 module_put(type->owner); 2855 return err; 2856 } 2857 2858 static int nf_tables_newexpr(const struct nft_ctx *ctx, 2859 const struct nft_expr_info *expr_info, 2860 struct nft_expr *expr) 2861 { 2862 const struct nft_expr_ops *ops = expr_info->ops; 2863 int err; 2864 2865 expr->ops = ops; 2866 if (ops->init) { 2867 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb); 2868 if (err < 0) 2869 goto err1; 2870 } 2871 2872 return 0; 2873 err1: 2874 expr->ops = NULL; 2875 return err; 2876 } 2877 2878 static void nf_tables_expr_destroy(const struct nft_ctx *ctx, 2879 struct nft_expr *expr) 2880 { 2881 const struct nft_expr_type *type = expr->ops->type; 2882 2883 if (expr->ops->destroy) 2884 expr->ops->destroy(ctx, expr); 2885 module_put(type->owner); 2886 } 2887 2888 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, 2889 const struct nlattr *nla) 2890 { 2891 struct nft_expr_info expr_info; 2892 struct nft_expr *expr; 2893 struct module *owner; 2894 int err; 2895 2896 err = nf_tables_expr_parse(ctx, nla, &expr_info); 2897 if (err < 0) 2898 goto err_expr_parse; 2899 2900 err = -EOPNOTSUPP; 2901 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL)) 2902 goto err_expr_stateful; 2903 2904 err = -ENOMEM; 2905 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT); 2906 if (expr == NULL) 2907 goto err_expr_stateful; 2908 2909 err = nf_tables_newexpr(ctx, &expr_info, expr); 2910 if (err < 0) 2911 goto err_expr_new; 2912 2913 return expr; 2914 err_expr_new: 2915 kfree(expr); 2916 err_expr_stateful: 2917 owner = expr_info.ops->type->owner; 2918 if (expr_info.ops->type->release_ops) 2919 expr_info.ops->type->release_ops(expr_info.ops); 2920 2921 module_put(owner); 2922 err_expr_parse: 2923 return ERR_PTR(err); 2924 } 2925 2926 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src) 2927 { 2928 int err; 2929 2930 if (src->ops->clone) { 2931 dst->ops = src->ops; 2932 err = src->ops->clone(dst, src); 2933 if (err < 0) 2934 return err; 2935 } else { 2936 memcpy(dst, src, src->ops->size); 2937 } 2938 2939 __module_get(src->ops->type->owner); 2940 2941 return 0; 2942 } 2943 2944 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) 2945 { 2946 nf_tables_expr_destroy(ctx, expr); 2947 kfree(expr); 2948 } 2949 2950 /* 2951 * Rules 2952 */ 2953 2954 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain, 2955 u64 handle) 2956 { 2957 struct nft_rule *rule; 2958 2959 // FIXME: this sucks 2960 list_for_each_entry_rcu(rule, &chain->rules, list) { 2961 if (handle == rule->handle) 2962 return rule; 2963 } 2964 2965 return ERR_PTR(-ENOENT); 2966 } 2967 2968 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain, 2969 const struct nlattr *nla) 2970 { 2971 if (nla == NULL) 2972 return ERR_PTR(-EINVAL); 2973 2974 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); 2975 } 2976 2977 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { 2978 [NFTA_RULE_TABLE] = { .type = NLA_STRING, 2979 .len = NFT_TABLE_MAXNAMELEN - 1 }, 2980 [NFTA_RULE_CHAIN] = { .type = NLA_STRING, 2981 .len = NFT_CHAIN_MAXNAMELEN - 1 }, 2982 [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, 2983 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, 2984 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, 2985 [NFTA_RULE_POSITION] = { .type = NLA_U64 }, 2986 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, 2987 .len = NFT_USERDATA_MAXLEN }, 2988 [NFTA_RULE_ID] = { .type = NLA_U32 }, 2989 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 }, 2990 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 }, 2991 }; 2992 2993 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, 2994 u32 portid, u32 seq, int event, 2995 u32 flags, int family, 2996 const struct nft_table *table, 2997 const struct nft_chain *chain, 2998 const struct nft_rule *rule, u64 handle) 2999 { 3000 struct nlmsghdr *nlh; 3001 const struct nft_expr *expr, *next; 3002 struct nlattr *list; 3003 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 3004 3005 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0, 3006 nft_base_seq(net)); 3007 if (!nlh) 3008 goto nla_put_failure; 3009 3010 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) 3011 goto nla_put_failure; 3012 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) 3013 goto nla_put_failure; 3014 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), 3015 NFTA_RULE_PAD)) 3016 goto nla_put_failure; 3017 3018 if (event != NFT_MSG_DELRULE && handle) { 3019 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle), 3020 NFTA_RULE_PAD)) 3021 goto nla_put_failure; 3022 } 3023 3024 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) 3025 nft_flow_rule_stats(chain, rule); 3026 3027 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS); 3028 if (list == NULL) 3029 goto nla_put_failure; 3030 nft_rule_for_each_expr(expr, next, rule) { 3031 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) 3032 goto nla_put_failure; 3033 } 3034 nla_nest_end(skb, list); 3035 3036 if (rule->udata) { 3037 struct nft_userdata *udata = nft_userdata(rule); 3038 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, 3039 udata->data) < 0) 3040 goto nla_put_failure; 3041 } 3042 3043 nlmsg_end(skb, nlh); 3044 return 0; 3045 3046 nla_put_failure: 3047 nlmsg_trim(skb, nlh); 3048 return -1; 3049 } 3050 3051 static void nf_tables_rule_notify(const struct nft_ctx *ctx, 3052 const struct nft_rule *rule, int event) 3053 { 3054 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 3055 const struct nft_rule *prule; 3056 struct sk_buff *skb; 3057 u64 handle = 0; 3058 u16 flags = 0; 3059 int err; 3060 3061 if (!ctx->report && 3062 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 3063 return; 3064 3065 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 3066 if (skb == NULL) 3067 goto err; 3068 3069 if (event == NFT_MSG_NEWRULE && 3070 !list_is_first(&rule->list, &ctx->chain->rules) && 3071 !list_is_last(&rule->list, &ctx->chain->rules)) { 3072 prule = list_prev_entry(rule, list); 3073 handle = prule->handle; 3074 } 3075 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE)) 3076 flags |= NLM_F_APPEND; 3077 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 3078 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 3079 3080 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, 3081 event, flags, ctx->family, ctx->table, 3082 ctx->chain, rule, handle); 3083 if (err < 0) { 3084 kfree_skb(skb); 3085 goto err; 3086 } 3087 3088 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 3089 return; 3090 err: 3091 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 3092 } 3093 3094 struct nft_rule_dump_ctx { 3095 char *table; 3096 char *chain; 3097 }; 3098 3099 static int __nf_tables_dump_rules(struct sk_buff *skb, 3100 unsigned int *idx, 3101 struct netlink_callback *cb, 3102 const struct nft_table *table, 3103 const struct nft_chain *chain) 3104 { 3105 struct net *net = sock_net(skb->sk); 3106 const struct nft_rule *rule, *prule; 3107 unsigned int s_idx = cb->args[0]; 3108 u64 handle; 3109 3110 prule = NULL; 3111 list_for_each_entry_rcu(rule, &chain->rules, list) { 3112 if (!nft_is_active(net, rule)) 3113 goto cont_skip; 3114 if (*idx < s_idx) 3115 goto cont; 3116 if (*idx > s_idx) { 3117 memset(&cb->args[1], 0, 3118 sizeof(cb->args) - sizeof(cb->args[0])); 3119 } 3120 if (prule) 3121 handle = prule->handle; 3122 else 3123 handle = 0; 3124 3125 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, 3126 cb->nlh->nlmsg_seq, 3127 NFT_MSG_NEWRULE, 3128 NLM_F_MULTI | NLM_F_APPEND, 3129 table->family, 3130 table, chain, rule, handle) < 0) 3131 return 1; 3132 3133 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3134 cont: 3135 prule = rule; 3136 cont_skip: 3137 (*idx)++; 3138 } 3139 return 0; 3140 } 3141 3142 static int nf_tables_dump_rules(struct sk_buff *skb, 3143 struct netlink_callback *cb) 3144 { 3145 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 3146 const struct nft_rule_dump_ctx *ctx = cb->data; 3147 struct nft_table *table; 3148 const struct nft_chain *chain; 3149 unsigned int idx = 0; 3150 struct net *net = sock_net(skb->sk); 3151 int family = nfmsg->nfgen_family; 3152 struct nftables_pernet *nft_net; 3153 3154 rcu_read_lock(); 3155 nft_net = nft_pernet(net); 3156 cb->seq = READ_ONCE(nft_net->base_seq); 3157 3158 list_for_each_entry_rcu(table, &nft_net->tables, list) { 3159 if (family != NFPROTO_UNSPEC && family != table->family) 3160 continue; 3161 3162 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0) 3163 continue; 3164 3165 if (ctx && ctx->table && ctx->chain) { 3166 struct rhlist_head *list, *tmp; 3167 3168 list = rhltable_lookup(&table->chains_ht, ctx->chain, 3169 nft_chain_ht_params); 3170 if (!list) 3171 goto done; 3172 3173 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) { 3174 if (!nft_is_active(net, chain)) 3175 continue; 3176 __nf_tables_dump_rules(skb, &idx, 3177 cb, table, chain); 3178 break; 3179 } 3180 goto done; 3181 } 3182 3183 list_for_each_entry_rcu(chain, &table->chains, list) { 3184 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain)) 3185 goto done; 3186 } 3187 3188 if (ctx && ctx->table) 3189 break; 3190 } 3191 done: 3192 rcu_read_unlock(); 3193 3194 cb->args[0] = idx; 3195 return skb->len; 3196 } 3197 3198 static int nf_tables_dump_rules_start(struct netlink_callback *cb) 3199 { 3200 const struct nlattr * const *nla = cb->data; 3201 struct nft_rule_dump_ctx *ctx = NULL; 3202 3203 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { 3204 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); 3205 if (!ctx) 3206 return -ENOMEM; 3207 3208 if (nla[NFTA_RULE_TABLE]) { 3209 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], 3210 GFP_ATOMIC); 3211 if (!ctx->table) { 3212 kfree(ctx); 3213 return -ENOMEM; 3214 } 3215 } 3216 if (nla[NFTA_RULE_CHAIN]) { 3217 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], 3218 GFP_ATOMIC); 3219 if (!ctx->chain) { 3220 kfree(ctx->table); 3221 kfree(ctx); 3222 return -ENOMEM; 3223 } 3224 } 3225 } 3226 3227 cb->data = ctx; 3228 return 0; 3229 } 3230 3231 static int nf_tables_dump_rules_done(struct netlink_callback *cb) 3232 { 3233 struct nft_rule_dump_ctx *ctx = cb->data; 3234 3235 if (ctx) { 3236 kfree(ctx->table); 3237 kfree(ctx->chain); 3238 kfree(ctx); 3239 } 3240 return 0; 3241 } 3242 3243 /* called with rcu_read_lock held */ 3244 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info, 3245 const struct nlattr * const nla[]) 3246 { 3247 struct netlink_ext_ack *extack = info->extack; 3248 u8 genmask = nft_genmask_cur(info->net); 3249 u8 family = info->nfmsg->nfgen_family; 3250 const struct nft_chain *chain; 3251 const struct nft_rule *rule; 3252 struct net *net = info->net; 3253 struct nft_table *table; 3254 struct sk_buff *skb2; 3255 int err; 3256 3257 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 3258 struct netlink_dump_control c = { 3259 .start= nf_tables_dump_rules_start, 3260 .dump = nf_tables_dump_rules, 3261 .done = nf_tables_dump_rules_done, 3262 .module = THIS_MODULE, 3263 .data = (void *)nla, 3264 }; 3265 3266 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 3267 } 3268 3269 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0); 3270 if (IS_ERR(table)) { 3271 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3272 return PTR_ERR(table); 3273 } 3274 3275 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask); 3276 if (IS_ERR(chain)) { 3277 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3278 return PTR_ERR(chain); 3279 } 3280 3281 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); 3282 if (IS_ERR(rule)) { 3283 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3284 return PTR_ERR(rule); 3285 } 3286 3287 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 3288 if (!skb2) 3289 return -ENOMEM; 3290 3291 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, 3292 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, 3293 family, table, chain, rule, 0); 3294 if (err < 0) 3295 goto err_fill_rule_info; 3296 3297 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 3298 3299 err_fill_rule_info: 3300 kfree_skb(skb2); 3301 return err; 3302 } 3303 3304 static void nf_tables_rule_destroy(const struct nft_ctx *ctx, 3305 struct nft_rule *rule) 3306 { 3307 struct nft_expr *expr, *next; 3308 3309 /* 3310 * Careful: some expressions might not be initialized in case this 3311 * is called on error from nf_tables_newrule(). 3312 */ 3313 expr = nft_expr_first(rule); 3314 while (nft_expr_more(rule, expr)) { 3315 next = nft_expr_next(expr); 3316 nf_tables_expr_destroy(ctx, expr); 3317 expr = next; 3318 } 3319 kfree(rule); 3320 } 3321 3322 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule) 3323 { 3324 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE); 3325 nf_tables_rule_destroy(ctx, rule); 3326 } 3327 3328 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain) 3329 { 3330 struct nft_expr *expr, *last; 3331 const struct nft_data *data; 3332 struct nft_rule *rule; 3333 int err; 3334 3335 if (ctx->level == NFT_JUMP_STACK_SIZE) 3336 return -EMLINK; 3337 3338 list_for_each_entry(rule, &chain->rules, list) { 3339 if (!nft_is_active_next(ctx->net, rule)) 3340 continue; 3341 3342 nft_rule_for_each_expr(expr, last, rule) { 3343 if (!expr->ops->validate) 3344 continue; 3345 3346 err = expr->ops->validate(ctx, expr, &data); 3347 if (err < 0) 3348 return err; 3349 } 3350 3351 cond_resched(); 3352 } 3353 3354 return 0; 3355 } 3356 EXPORT_SYMBOL_GPL(nft_chain_validate); 3357 3358 static int nft_table_validate(struct net *net, const struct nft_table *table) 3359 { 3360 struct nft_chain *chain; 3361 struct nft_ctx ctx = { 3362 .net = net, 3363 .family = table->family, 3364 }; 3365 int err; 3366 3367 list_for_each_entry(chain, &table->chains, list) { 3368 if (!nft_is_base_chain(chain)) 3369 continue; 3370 3371 ctx.chain = chain; 3372 err = nft_chain_validate(&ctx, chain); 3373 if (err < 0) 3374 return err; 3375 } 3376 3377 return 0; 3378 } 3379 3380 static struct nft_rule *nft_rule_lookup_byid(const struct net *net, 3381 const struct nft_chain *chain, 3382 const struct nlattr *nla); 3383 3384 #define NFT_RULE_MAXEXPRS 128 3385 3386 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info, 3387 const struct nlattr * const nla[]) 3388 { 3389 struct nftables_pernet *nft_net = nft_pernet(info->net); 3390 struct netlink_ext_ack *extack = info->extack; 3391 unsigned int size, i, n, ulen = 0, usize = 0; 3392 u8 genmask = nft_genmask_next(info->net); 3393 struct nft_rule *rule, *old_rule = NULL; 3394 struct nft_expr_info *expr_info = NULL; 3395 u8 family = info->nfmsg->nfgen_family; 3396 struct nft_flow_rule *flow = NULL; 3397 struct net *net = info->net; 3398 struct nft_userdata *udata; 3399 struct nft_table *table; 3400 struct nft_chain *chain; 3401 struct nft_trans *trans; 3402 u64 handle, pos_handle; 3403 struct nft_expr *expr; 3404 struct nft_ctx ctx; 3405 struct nlattr *tmp; 3406 int err, rem; 3407 3408 lockdep_assert_held(&nft_net->commit_mutex); 3409 3410 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 3411 NETLINK_CB(skb).portid); 3412 if (IS_ERR(table)) { 3413 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3414 return PTR_ERR(table); 3415 } 3416 3417 if (nla[NFTA_RULE_CHAIN]) { 3418 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], 3419 genmask); 3420 if (IS_ERR(chain)) { 3421 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3422 return PTR_ERR(chain); 3423 } 3424 if (nft_chain_is_bound(chain)) 3425 return -EOPNOTSUPP; 3426 3427 } else if (nla[NFTA_RULE_CHAIN_ID]) { 3428 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]); 3429 if (IS_ERR(chain)) { 3430 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]); 3431 return PTR_ERR(chain); 3432 } 3433 } else { 3434 return -EINVAL; 3435 } 3436 3437 if (nla[NFTA_RULE_HANDLE]) { 3438 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); 3439 rule = __nft_rule_lookup(chain, handle); 3440 if (IS_ERR(rule)) { 3441 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3442 return PTR_ERR(rule); 3443 } 3444 3445 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 3446 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3447 return -EEXIST; 3448 } 3449 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 3450 old_rule = rule; 3451 else 3452 return -EOPNOTSUPP; 3453 } else { 3454 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) || 3455 info->nlh->nlmsg_flags & NLM_F_REPLACE) 3456 return -EINVAL; 3457 handle = nf_tables_alloc_handle(table); 3458 3459 if (chain->use == UINT_MAX) 3460 return -EOVERFLOW; 3461 3462 if (nla[NFTA_RULE_POSITION]) { 3463 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); 3464 old_rule = __nft_rule_lookup(chain, pos_handle); 3465 if (IS_ERR(old_rule)) { 3466 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]); 3467 return PTR_ERR(old_rule); 3468 } 3469 } else if (nla[NFTA_RULE_POSITION_ID]) { 3470 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]); 3471 if (IS_ERR(old_rule)) { 3472 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]); 3473 return PTR_ERR(old_rule); 3474 } 3475 } 3476 } 3477 3478 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 3479 3480 n = 0; 3481 size = 0; 3482 if (nla[NFTA_RULE_EXPRESSIONS]) { 3483 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS, 3484 sizeof(struct nft_expr_info), 3485 GFP_KERNEL); 3486 if (!expr_info) 3487 return -ENOMEM; 3488 3489 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { 3490 err = -EINVAL; 3491 if (nla_type(tmp) != NFTA_LIST_ELEM) 3492 goto err_release_expr; 3493 if (n == NFT_RULE_MAXEXPRS) 3494 goto err_release_expr; 3495 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]); 3496 if (err < 0) { 3497 NL_SET_BAD_ATTR(extack, tmp); 3498 goto err_release_expr; 3499 } 3500 size += expr_info[n].ops->size; 3501 n++; 3502 } 3503 } 3504 /* Check for overflow of dlen field */ 3505 err = -EFBIG; 3506 if (size >= 1 << 12) 3507 goto err_release_expr; 3508 3509 if (nla[NFTA_RULE_USERDATA]) { 3510 ulen = nla_len(nla[NFTA_RULE_USERDATA]); 3511 if (ulen > 0) 3512 usize = sizeof(struct nft_userdata) + ulen; 3513 } 3514 3515 err = -ENOMEM; 3516 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT); 3517 if (rule == NULL) 3518 goto err_release_expr; 3519 3520 nft_activate_next(net, rule); 3521 3522 rule->handle = handle; 3523 rule->dlen = size; 3524 rule->udata = ulen ? 1 : 0; 3525 3526 if (ulen) { 3527 udata = nft_userdata(rule); 3528 udata->len = ulen - 1; 3529 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); 3530 } 3531 3532 expr = nft_expr_first(rule); 3533 for (i = 0; i < n; i++) { 3534 err = nf_tables_newexpr(&ctx, &expr_info[i], expr); 3535 if (err < 0) { 3536 NL_SET_BAD_ATTR(extack, expr_info[i].attr); 3537 goto err_release_rule; 3538 } 3539 3540 if (expr_info[i].ops->validate) 3541 nft_validate_state_update(net, NFT_VALIDATE_NEED); 3542 3543 expr_info[i].ops = NULL; 3544 expr = nft_expr_next(expr); 3545 } 3546 3547 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) { 3548 flow = nft_flow_rule_create(net, rule); 3549 if (IS_ERR(flow)) { 3550 err = PTR_ERR(flow); 3551 goto err_release_rule; 3552 } 3553 } 3554 3555 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) { 3556 err = nft_delrule(&ctx, old_rule); 3557 if (err < 0) 3558 goto err_destroy_flow_rule; 3559 3560 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule); 3561 if (trans == NULL) { 3562 err = -ENOMEM; 3563 goto err_destroy_flow_rule; 3564 } 3565 list_add_tail_rcu(&rule->list, &old_rule->list); 3566 } else { 3567 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule); 3568 if (!trans) { 3569 err = -ENOMEM; 3570 goto err_destroy_flow_rule; 3571 } 3572 3573 if (info->nlh->nlmsg_flags & NLM_F_APPEND) { 3574 if (old_rule) 3575 list_add_rcu(&rule->list, &old_rule->list); 3576 else 3577 list_add_tail_rcu(&rule->list, &chain->rules); 3578 } else { 3579 if (old_rule) 3580 list_add_tail_rcu(&rule->list, &old_rule->list); 3581 else 3582 list_add_rcu(&rule->list, &chain->rules); 3583 } 3584 } 3585 kvfree(expr_info); 3586 chain->use++; 3587 3588 if (flow) 3589 nft_trans_flow_rule(trans) = flow; 3590 3591 if (nft_net->validate_state == NFT_VALIDATE_DO) 3592 return nft_table_validate(net, table); 3593 3594 return 0; 3595 3596 err_destroy_flow_rule: 3597 if (flow) 3598 nft_flow_rule_destroy(flow); 3599 err_release_rule: 3600 nf_tables_rule_release(&ctx, rule); 3601 err_release_expr: 3602 for (i = 0; i < n; i++) { 3603 if (expr_info[i].ops) { 3604 module_put(expr_info[i].ops->type->owner); 3605 if (expr_info[i].ops->type->release_ops) 3606 expr_info[i].ops->type->release_ops(expr_info[i].ops); 3607 } 3608 } 3609 kvfree(expr_info); 3610 3611 return err; 3612 } 3613 3614 static struct nft_rule *nft_rule_lookup_byid(const struct net *net, 3615 const struct nft_chain *chain, 3616 const struct nlattr *nla) 3617 { 3618 struct nftables_pernet *nft_net = nft_pernet(net); 3619 u32 id = ntohl(nla_get_be32(nla)); 3620 struct nft_trans *trans; 3621 3622 list_for_each_entry(trans, &nft_net->commit_list, list) { 3623 struct nft_rule *rule = nft_trans_rule(trans); 3624 3625 if (trans->msg_type == NFT_MSG_NEWRULE && 3626 trans->ctx.chain == chain && 3627 id == nft_trans_rule_id(trans)) 3628 return rule; 3629 } 3630 return ERR_PTR(-ENOENT); 3631 } 3632 3633 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info, 3634 const struct nlattr * const nla[]) 3635 { 3636 struct netlink_ext_ack *extack = info->extack; 3637 u8 genmask = nft_genmask_next(info->net); 3638 u8 family = info->nfmsg->nfgen_family; 3639 struct nft_chain *chain = NULL; 3640 struct net *net = info->net; 3641 struct nft_table *table; 3642 struct nft_rule *rule; 3643 struct nft_ctx ctx; 3644 int err = 0; 3645 3646 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 3647 NETLINK_CB(skb).portid); 3648 if (IS_ERR(table)) { 3649 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3650 return PTR_ERR(table); 3651 } 3652 3653 if (nla[NFTA_RULE_CHAIN]) { 3654 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], 3655 genmask); 3656 if (IS_ERR(chain)) { 3657 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3658 return PTR_ERR(chain); 3659 } 3660 if (nft_chain_is_bound(chain)) 3661 return -EOPNOTSUPP; 3662 } 3663 3664 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 3665 3666 if (chain) { 3667 if (nla[NFTA_RULE_HANDLE]) { 3668 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); 3669 if (IS_ERR(rule)) { 3670 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3671 return PTR_ERR(rule); 3672 } 3673 3674 err = nft_delrule(&ctx, rule); 3675 } else if (nla[NFTA_RULE_ID]) { 3676 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]); 3677 if (IS_ERR(rule)) { 3678 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]); 3679 return PTR_ERR(rule); 3680 } 3681 3682 err = nft_delrule(&ctx, rule); 3683 } else { 3684 err = nft_delrule_by_chain(&ctx); 3685 } 3686 } else { 3687 list_for_each_entry(chain, &table->chains, list) { 3688 if (!nft_is_active_next(net, chain)) 3689 continue; 3690 3691 ctx.chain = chain; 3692 err = nft_delrule_by_chain(&ctx); 3693 if (err < 0) 3694 break; 3695 } 3696 } 3697 3698 return err; 3699 } 3700 3701 /* 3702 * Sets 3703 */ 3704 static const struct nft_set_type *nft_set_types[] = { 3705 &nft_set_hash_fast_type, 3706 &nft_set_hash_type, 3707 &nft_set_rhash_type, 3708 &nft_set_bitmap_type, 3709 &nft_set_rbtree_type, 3710 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML) 3711 &nft_set_pipapo_avx2_type, 3712 #endif 3713 &nft_set_pipapo_type, 3714 }; 3715 3716 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ 3717 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \ 3718 NFT_SET_EVAL) 3719 3720 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags) 3721 { 3722 return (flags & type->features) == (flags & NFT_SET_FEATURES); 3723 } 3724 3725 /* 3726 * Select a set implementation based on the data characteristics and the 3727 * given policy. The total memory use might not be known if no size is 3728 * given, in that case the amount of memory per element is used. 3729 */ 3730 static const struct nft_set_ops * 3731 nft_select_set_ops(const struct nft_ctx *ctx, 3732 const struct nlattr * const nla[], 3733 const struct nft_set_desc *desc, 3734 enum nft_set_policies policy) 3735 { 3736 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 3737 const struct nft_set_ops *ops, *bops; 3738 struct nft_set_estimate est, best; 3739 const struct nft_set_type *type; 3740 u32 flags = 0; 3741 int i; 3742 3743 lockdep_assert_held(&nft_net->commit_mutex); 3744 lockdep_nfnl_nft_mutex_not_held(); 3745 3746 if (nla[NFTA_SET_FLAGS] != NULL) 3747 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); 3748 3749 bops = NULL; 3750 best.size = ~0; 3751 best.lookup = ~0; 3752 best.space = ~0; 3753 3754 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) { 3755 type = nft_set_types[i]; 3756 ops = &type->ops; 3757 3758 if (!nft_set_ops_candidate(type, flags)) 3759 continue; 3760 if (!ops->estimate(desc, flags, &est)) 3761 continue; 3762 3763 switch (policy) { 3764 case NFT_SET_POL_PERFORMANCE: 3765 if (est.lookup < best.lookup) 3766 break; 3767 if (est.lookup == best.lookup && 3768 est.space < best.space) 3769 break; 3770 continue; 3771 case NFT_SET_POL_MEMORY: 3772 if (!desc->size) { 3773 if (est.space < best.space) 3774 break; 3775 if (est.space == best.space && 3776 est.lookup < best.lookup) 3777 break; 3778 } else if (est.size < best.size || !bops) { 3779 break; 3780 } 3781 continue; 3782 default: 3783 break; 3784 } 3785 3786 bops = ops; 3787 best = est; 3788 } 3789 3790 if (bops != NULL) 3791 return bops; 3792 3793 return ERR_PTR(-EOPNOTSUPP); 3794 } 3795 3796 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { 3797 [NFTA_SET_TABLE] = { .type = NLA_STRING, 3798 .len = NFT_TABLE_MAXNAMELEN - 1 }, 3799 [NFTA_SET_NAME] = { .type = NLA_STRING, 3800 .len = NFT_SET_MAXNAMELEN - 1 }, 3801 [NFTA_SET_FLAGS] = { .type = NLA_U32 }, 3802 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, 3803 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, 3804 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, 3805 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, 3806 [NFTA_SET_POLICY] = { .type = NLA_U32 }, 3807 [NFTA_SET_DESC] = { .type = NLA_NESTED }, 3808 [NFTA_SET_ID] = { .type = NLA_U32 }, 3809 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, 3810 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, 3811 [NFTA_SET_USERDATA] = { .type = NLA_BINARY, 3812 .len = NFT_USERDATA_MAXLEN }, 3813 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, 3814 [NFTA_SET_HANDLE] = { .type = NLA_U64 }, 3815 [NFTA_SET_EXPR] = { .type = NLA_NESTED }, 3816 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED }, 3817 }; 3818 3819 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { 3820 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, 3821 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED }, 3822 }; 3823 3824 static struct nft_set *nft_set_lookup(const struct nft_table *table, 3825 const struct nlattr *nla, u8 genmask) 3826 { 3827 struct nft_set *set; 3828 3829 if (nla == NULL) 3830 return ERR_PTR(-EINVAL); 3831 3832 list_for_each_entry_rcu(set, &table->sets, list) { 3833 if (!nla_strcmp(nla, set->name) && 3834 nft_active_genmask(set, genmask)) 3835 return set; 3836 } 3837 return ERR_PTR(-ENOENT); 3838 } 3839 3840 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table, 3841 const struct nlattr *nla, 3842 u8 genmask) 3843 { 3844 struct nft_set *set; 3845 3846 list_for_each_entry(set, &table->sets, list) { 3847 if (be64_to_cpu(nla_get_be64(nla)) == set->handle && 3848 nft_active_genmask(set, genmask)) 3849 return set; 3850 } 3851 return ERR_PTR(-ENOENT); 3852 } 3853 3854 static struct nft_set *nft_set_lookup_byid(const struct net *net, 3855 const struct nft_table *table, 3856 const struct nlattr *nla, u8 genmask) 3857 { 3858 struct nftables_pernet *nft_net = nft_pernet(net); 3859 u32 id = ntohl(nla_get_be32(nla)); 3860 struct nft_trans *trans; 3861 3862 list_for_each_entry(trans, &nft_net->commit_list, list) { 3863 if (trans->msg_type == NFT_MSG_NEWSET) { 3864 struct nft_set *set = nft_trans_set(trans); 3865 3866 if (id == nft_trans_set_id(trans) && 3867 set->table == table && 3868 nft_active_genmask(set, genmask)) 3869 return set; 3870 } 3871 } 3872 return ERR_PTR(-ENOENT); 3873 } 3874 3875 struct nft_set *nft_set_lookup_global(const struct net *net, 3876 const struct nft_table *table, 3877 const struct nlattr *nla_set_name, 3878 const struct nlattr *nla_set_id, 3879 u8 genmask) 3880 { 3881 struct nft_set *set; 3882 3883 set = nft_set_lookup(table, nla_set_name, genmask); 3884 if (IS_ERR(set)) { 3885 if (!nla_set_id) 3886 return set; 3887 3888 set = nft_set_lookup_byid(net, table, nla_set_id, genmask); 3889 } 3890 return set; 3891 } 3892 EXPORT_SYMBOL_GPL(nft_set_lookup_global); 3893 3894 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, 3895 const char *name) 3896 { 3897 const struct nft_set *i; 3898 const char *p; 3899 unsigned long *inuse; 3900 unsigned int n = 0, min = 0; 3901 3902 p = strchr(name, '%'); 3903 if (p != NULL) { 3904 if (p[1] != 'd' || strchr(p + 2, '%')) 3905 return -EINVAL; 3906 3907 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); 3908 if (inuse == NULL) 3909 return -ENOMEM; 3910 cont: 3911 list_for_each_entry(i, &ctx->table->sets, list) { 3912 int tmp; 3913 3914 if (!nft_is_active_next(ctx->net, i)) 3915 continue; 3916 if (!sscanf(i->name, name, &tmp)) 3917 continue; 3918 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) 3919 continue; 3920 3921 set_bit(tmp - min, inuse); 3922 } 3923 3924 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); 3925 if (n >= BITS_PER_BYTE * PAGE_SIZE) { 3926 min += BITS_PER_BYTE * PAGE_SIZE; 3927 memset(inuse, 0, PAGE_SIZE); 3928 goto cont; 3929 } 3930 free_page((unsigned long)inuse); 3931 } 3932 3933 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n); 3934 if (!set->name) 3935 return -ENOMEM; 3936 3937 list_for_each_entry(i, &ctx->table->sets, list) { 3938 if (!nft_is_active_next(ctx->net, i)) 3939 continue; 3940 if (!strcmp(set->name, i->name)) { 3941 kfree(set->name); 3942 set->name = NULL; 3943 return -ENFILE; 3944 } 3945 } 3946 return 0; 3947 } 3948 3949 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result) 3950 { 3951 u64 ms = be64_to_cpu(nla_get_be64(nla)); 3952 u64 max = (u64)(~((u64)0)); 3953 3954 max = div_u64(max, NSEC_PER_MSEC); 3955 if (ms >= max) 3956 return -ERANGE; 3957 3958 ms *= NSEC_PER_MSEC; 3959 *result = nsecs_to_jiffies64(ms); 3960 return 0; 3961 } 3962 3963 __be64 nf_jiffies64_to_msecs(u64 input) 3964 { 3965 return cpu_to_be64(jiffies64_to_msecs(input)); 3966 } 3967 3968 static int nf_tables_fill_set_concat(struct sk_buff *skb, 3969 const struct nft_set *set) 3970 { 3971 struct nlattr *concat, *field; 3972 int i; 3973 3974 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT); 3975 if (!concat) 3976 return -ENOMEM; 3977 3978 for (i = 0; i < set->field_count; i++) { 3979 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM); 3980 if (!field) 3981 return -ENOMEM; 3982 3983 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN, 3984 htonl(set->field_len[i]))) 3985 return -ENOMEM; 3986 3987 nla_nest_end(skb, field); 3988 } 3989 3990 nla_nest_end(skb, concat); 3991 3992 return 0; 3993 } 3994 3995 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, 3996 const struct nft_set *set, u16 event, u16 flags) 3997 { 3998 struct nlmsghdr *nlh; 3999 u32 portid = ctx->portid; 4000 struct nlattr *nest; 4001 u32 seq = ctx->seq; 4002 int i; 4003 4004 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 4005 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family, 4006 NFNETLINK_V0, nft_base_seq(ctx->net)); 4007 if (!nlh) 4008 goto nla_put_failure; 4009 4010 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) 4011 goto nla_put_failure; 4012 if (nla_put_string(skb, NFTA_SET_NAME, set->name)) 4013 goto nla_put_failure; 4014 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle), 4015 NFTA_SET_PAD)) 4016 goto nla_put_failure; 4017 if (set->flags != 0) 4018 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) 4019 goto nla_put_failure; 4020 4021 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) 4022 goto nla_put_failure; 4023 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) 4024 goto nla_put_failure; 4025 if (set->flags & NFT_SET_MAP) { 4026 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) 4027 goto nla_put_failure; 4028 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) 4029 goto nla_put_failure; 4030 } 4031 if (set->flags & NFT_SET_OBJECT && 4032 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) 4033 goto nla_put_failure; 4034 4035 if (set->timeout && 4036 nla_put_be64(skb, NFTA_SET_TIMEOUT, 4037 nf_jiffies64_to_msecs(set->timeout), 4038 NFTA_SET_PAD)) 4039 goto nla_put_failure; 4040 if (set->gc_int && 4041 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) 4042 goto nla_put_failure; 4043 4044 if (set->policy != NFT_SET_POL_PERFORMANCE) { 4045 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) 4046 goto nla_put_failure; 4047 } 4048 4049 if (set->udata && 4050 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) 4051 goto nla_put_failure; 4052 4053 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC); 4054 if (!nest) 4055 goto nla_put_failure; 4056 if (set->size && 4057 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) 4058 goto nla_put_failure; 4059 4060 if (set->field_count > 1 && 4061 nf_tables_fill_set_concat(skb, set)) 4062 goto nla_put_failure; 4063 4064 nla_nest_end(skb, nest); 4065 4066 if (set->num_exprs == 1) { 4067 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR); 4068 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0) 4069 goto nla_put_failure; 4070 4071 nla_nest_end(skb, nest); 4072 } else if (set->num_exprs > 1) { 4073 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS); 4074 if (nest == NULL) 4075 goto nla_put_failure; 4076 4077 for (i = 0; i < set->num_exprs; i++) { 4078 if (nft_expr_dump(skb, NFTA_LIST_ELEM, 4079 set->exprs[i]) < 0) 4080 goto nla_put_failure; 4081 } 4082 nla_nest_end(skb, nest); 4083 } 4084 4085 nlmsg_end(skb, nlh); 4086 return 0; 4087 4088 nla_put_failure: 4089 nlmsg_trim(skb, nlh); 4090 return -1; 4091 } 4092 4093 static void nf_tables_set_notify(const struct nft_ctx *ctx, 4094 const struct nft_set *set, int event, 4095 gfp_t gfp_flags) 4096 { 4097 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 4098 u32 portid = ctx->portid; 4099 struct sk_buff *skb; 4100 u16 flags = 0; 4101 int err; 4102 4103 if (!ctx->report && 4104 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 4105 return; 4106 4107 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); 4108 if (skb == NULL) 4109 goto err; 4110 4111 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 4112 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 4113 4114 err = nf_tables_fill_set(skb, ctx, set, event, flags); 4115 if (err < 0) { 4116 kfree_skb(skb); 4117 goto err; 4118 } 4119 4120 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 4121 return; 4122 err: 4123 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 4124 } 4125 4126 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) 4127 { 4128 const struct nft_set *set; 4129 unsigned int idx, s_idx = cb->args[0]; 4130 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; 4131 struct net *net = sock_net(skb->sk); 4132 struct nft_ctx *ctx = cb->data, ctx_set; 4133 struct nftables_pernet *nft_net; 4134 4135 if (cb->args[1]) 4136 return skb->len; 4137 4138 rcu_read_lock(); 4139 nft_net = nft_pernet(net); 4140 cb->seq = READ_ONCE(nft_net->base_seq); 4141 4142 list_for_each_entry_rcu(table, &nft_net->tables, list) { 4143 if (ctx->family != NFPROTO_UNSPEC && 4144 ctx->family != table->family) 4145 continue; 4146 4147 if (ctx->table && ctx->table != table) 4148 continue; 4149 4150 if (cur_table) { 4151 if (cur_table != table) 4152 continue; 4153 4154 cur_table = NULL; 4155 } 4156 idx = 0; 4157 list_for_each_entry_rcu(set, &table->sets, list) { 4158 if (idx < s_idx) 4159 goto cont; 4160 if (!nft_is_active(net, set)) 4161 goto cont; 4162 4163 ctx_set = *ctx; 4164 ctx_set.table = table; 4165 ctx_set.family = table->family; 4166 4167 if (nf_tables_fill_set(skb, &ctx_set, set, 4168 NFT_MSG_NEWSET, 4169 NLM_F_MULTI) < 0) { 4170 cb->args[0] = idx; 4171 cb->args[2] = (unsigned long) table; 4172 goto done; 4173 } 4174 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4175 cont: 4176 idx++; 4177 } 4178 if (s_idx) 4179 s_idx = 0; 4180 } 4181 cb->args[1] = 1; 4182 done: 4183 rcu_read_unlock(); 4184 return skb->len; 4185 } 4186 4187 static int nf_tables_dump_sets_start(struct netlink_callback *cb) 4188 { 4189 struct nft_ctx *ctx_dump = NULL; 4190 4191 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC); 4192 if (ctx_dump == NULL) 4193 return -ENOMEM; 4194 4195 cb->data = ctx_dump; 4196 return 0; 4197 } 4198 4199 static int nf_tables_dump_sets_done(struct netlink_callback *cb) 4200 { 4201 kfree(cb->data); 4202 return 0; 4203 } 4204 4205 /* called with rcu_read_lock held */ 4206 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info, 4207 const struct nlattr * const nla[]) 4208 { 4209 struct netlink_ext_ack *extack = info->extack; 4210 u8 genmask = nft_genmask_cur(info->net); 4211 u8 family = info->nfmsg->nfgen_family; 4212 struct nft_table *table = NULL; 4213 struct net *net = info->net; 4214 const struct nft_set *set; 4215 struct sk_buff *skb2; 4216 struct nft_ctx ctx; 4217 int err; 4218 4219 if (nla[NFTA_SET_TABLE]) { 4220 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, 4221 genmask, 0); 4222 if (IS_ERR(table)) { 4223 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4224 return PTR_ERR(table); 4225 } 4226 } 4227 4228 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4229 4230 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 4231 struct netlink_dump_control c = { 4232 .start = nf_tables_dump_sets_start, 4233 .dump = nf_tables_dump_sets, 4234 .done = nf_tables_dump_sets_done, 4235 .data = &ctx, 4236 .module = THIS_MODULE, 4237 }; 4238 4239 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 4240 } 4241 4242 /* Only accept unspec with dump */ 4243 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC) 4244 return -EAFNOSUPPORT; 4245 if (!nla[NFTA_SET_TABLE]) 4246 return -EINVAL; 4247 4248 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask); 4249 if (IS_ERR(set)) 4250 return PTR_ERR(set); 4251 4252 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 4253 if (skb2 == NULL) 4254 return -ENOMEM; 4255 4256 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); 4257 if (err < 0) 4258 goto err_fill_set_info; 4259 4260 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 4261 4262 err_fill_set_info: 4263 kfree_skb(skb2); 4264 return err; 4265 } 4266 4267 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = { 4268 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 }, 4269 }; 4270 4271 static int nft_set_desc_concat_parse(const struct nlattr *attr, 4272 struct nft_set_desc *desc) 4273 { 4274 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1]; 4275 u32 len; 4276 int err; 4277 4278 if (desc->field_count >= ARRAY_SIZE(desc->field_len)) 4279 return -E2BIG; 4280 4281 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr, 4282 nft_concat_policy, NULL); 4283 if (err < 0) 4284 return err; 4285 4286 if (!tb[NFTA_SET_FIELD_LEN]) 4287 return -EINVAL; 4288 4289 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN])); 4290 if (!len || len > U8_MAX) 4291 return -EINVAL; 4292 4293 desc->field_len[desc->field_count++] = len; 4294 4295 return 0; 4296 } 4297 4298 static int nft_set_desc_concat(struct nft_set_desc *desc, 4299 const struct nlattr *nla) 4300 { 4301 struct nlattr *attr; 4302 u32 num_regs = 0; 4303 int rem, err, i; 4304 4305 nla_for_each_nested(attr, nla, rem) { 4306 if (nla_type(attr) != NFTA_LIST_ELEM) 4307 return -EINVAL; 4308 4309 err = nft_set_desc_concat_parse(attr, desc); 4310 if (err < 0) 4311 return err; 4312 } 4313 4314 for (i = 0; i < desc->field_count; i++) 4315 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32)); 4316 4317 if (num_regs > NFT_REG32_COUNT) 4318 return -E2BIG; 4319 4320 return 0; 4321 } 4322 4323 static int nf_tables_set_desc_parse(struct nft_set_desc *desc, 4324 const struct nlattr *nla) 4325 { 4326 struct nlattr *da[NFTA_SET_DESC_MAX + 1]; 4327 int err; 4328 4329 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla, 4330 nft_set_desc_policy, NULL); 4331 if (err < 0) 4332 return err; 4333 4334 if (da[NFTA_SET_DESC_SIZE] != NULL) 4335 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); 4336 if (da[NFTA_SET_DESC_CONCAT]) 4337 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]); 4338 4339 return err; 4340 } 4341 4342 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info, 4343 const struct nlattr * const nla[]) 4344 { 4345 u32 ktype, dtype, flags, policy, gc_int, objtype; 4346 struct netlink_ext_ack *extack = info->extack; 4347 u8 genmask = nft_genmask_next(info->net); 4348 u8 family = info->nfmsg->nfgen_family; 4349 const struct nft_set_ops *ops; 4350 struct nft_expr *expr = NULL; 4351 struct net *net = info->net; 4352 struct nft_set_desc desc; 4353 struct nft_table *table; 4354 unsigned char *udata; 4355 struct nft_set *set; 4356 struct nft_ctx ctx; 4357 size_t alloc_size; 4358 u64 timeout; 4359 char *name; 4360 int err, i; 4361 u16 udlen; 4362 u64 size; 4363 4364 if (nla[NFTA_SET_TABLE] == NULL || 4365 nla[NFTA_SET_NAME] == NULL || 4366 nla[NFTA_SET_KEY_LEN] == NULL || 4367 nla[NFTA_SET_ID] == NULL) 4368 return -EINVAL; 4369 4370 memset(&desc, 0, sizeof(desc)); 4371 4372 ktype = NFT_DATA_VALUE; 4373 if (nla[NFTA_SET_KEY_TYPE] != NULL) { 4374 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); 4375 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) 4376 return -EINVAL; 4377 } 4378 4379 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); 4380 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) 4381 return -EINVAL; 4382 4383 flags = 0; 4384 if (nla[NFTA_SET_FLAGS] != NULL) { 4385 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); 4386 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | 4387 NFT_SET_INTERVAL | NFT_SET_TIMEOUT | 4388 NFT_SET_MAP | NFT_SET_EVAL | 4389 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR)) 4390 return -EOPNOTSUPP; 4391 /* Only one of these operations is supported */ 4392 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) == 4393 (NFT_SET_MAP | NFT_SET_OBJECT)) 4394 return -EOPNOTSUPP; 4395 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) == 4396 (NFT_SET_EVAL | NFT_SET_OBJECT)) 4397 return -EOPNOTSUPP; 4398 } 4399 4400 dtype = 0; 4401 if (nla[NFTA_SET_DATA_TYPE] != NULL) { 4402 if (!(flags & NFT_SET_MAP)) 4403 return -EINVAL; 4404 4405 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); 4406 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && 4407 dtype != NFT_DATA_VERDICT) 4408 return -EINVAL; 4409 4410 if (dtype != NFT_DATA_VERDICT) { 4411 if (nla[NFTA_SET_DATA_LEN] == NULL) 4412 return -EINVAL; 4413 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); 4414 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) 4415 return -EINVAL; 4416 } else 4417 desc.dlen = sizeof(struct nft_verdict); 4418 } else if (flags & NFT_SET_MAP) 4419 return -EINVAL; 4420 4421 if (nla[NFTA_SET_OBJ_TYPE] != NULL) { 4422 if (!(flags & NFT_SET_OBJECT)) 4423 return -EINVAL; 4424 4425 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); 4426 if (objtype == NFT_OBJECT_UNSPEC || 4427 objtype > NFT_OBJECT_MAX) 4428 return -EOPNOTSUPP; 4429 } else if (flags & NFT_SET_OBJECT) 4430 return -EINVAL; 4431 else 4432 objtype = NFT_OBJECT_UNSPEC; 4433 4434 timeout = 0; 4435 if (nla[NFTA_SET_TIMEOUT] != NULL) { 4436 if (!(flags & NFT_SET_TIMEOUT)) 4437 return -EINVAL; 4438 4439 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout); 4440 if (err) 4441 return err; 4442 } 4443 gc_int = 0; 4444 if (nla[NFTA_SET_GC_INTERVAL] != NULL) { 4445 if (!(flags & NFT_SET_TIMEOUT)) 4446 return -EINVAL; 4447 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); 4448 } 4449 4450 policy = NFT_SET_POL_PERFORMANCE; 4451 if (nla[NFTA_SET_POLICY] != NULL) 4452 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); 4453 4454 if (nla[NFTA_SET_DESC] != NULL) { 4455 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]); 4456 if (err < 0) 4457 return err; 4458 4459 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT)) 4460 return -EINVAL; 4461 } else if (flags & NFT_SET_CONCAT) { 4462 return -EINVAL; 4463 } 4464 4465 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS]) 4466 desc.expr = true; 4467 4468 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask, 4469 NETLINK_CB(skb).portid); 4470 if (IS_ERR(table)) { 4471 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4472 return PTR_ERR(table); 4473 } 4474 4475 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4476 4477 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask); 4478 if (IS_ERR(set)) { 4479 if (PTR_ERR(set) != -ENOENT) { 4480 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); 4481 return PTR_ERR(set); 4482 } 4483 } else { 4484 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 4485 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); 4486 return -EEXIST; 4487 } 4488 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 4489 return -EOPNOTSUPP; 4490 4491 return 0; 4492 } 4493 4494 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE)) 4495 return -ENOENT; 4496 4497 ops = nft_select_set_ops(&ctx, nla, &desc, policy); 4498 if (IS_ERR(ops)) 4499 return PTR_ERR(ops); 4500 4501 udlen = 0; 4502 if (nla[NFTA_SET_USERDATA]) 4503 udlen = nla_len(nla[NFTA_SET_USERDATA]); 4504 4505 size = 0; 4506 if (ops->privsize != NULL) 4507 size = ops->privsize(nla, &desc); 4508 alloc_size = sizeof(*set) + size + udlen; 4509 if (alloc_size < size || alloc_size > INT_MAX) 4510 return -ENOMEM; 4511 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT); 4512 if (!set) 4513 return -ENOMEM; 4514 4515 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT); 4516 if (!name) { 4517 err = -ENOMEM; 4518 goto err_set_name; 4519 } 4520 4521 err = nf_tables_set_alloc_name(&ctx, set, name); 4522 kfree(name); 4523 if (err < 0) 4524 goto err_set_name; 4525 4526 udata = NULL; 4527 if (udlen) { 4528 udata = set->data + size; 4529 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); 4530 } 4531 4532 INIT_LIST_HEAD(&set->bindings); 4533 INIT_LIST_HEAD(&set->catchall_list); 4534 set->table = table; 4535 write_pnet(&set->net, net); 4536 set->ops = ops; 4537 set->ktype = ktype; 4538 set->klen = desc.klen; 4539 set->dtype = dtype; 4540 set->objtype = objtype; 4541 set->dlen = desc.dlen; 4542 set->flags = flags; 4543 set->size = desc.size; 4544 set->policy = policy; 4545 set->udlen = udlen; 4546 set->udata = udata; 4547 set->timeout = timeout; 4548 set->gc_int = gc_int; 4549 4550 set->field_count = desc.field_count; 4551 for (i = 0; i < desc.field_count; i++) 4552 set->field_len[i] = desc.field_len[i]; 4553 4554 err = ops->init(set, &desc, nla); 4555 if (err < 0) 4556 goto err_set_init; 4557 4558 if (nla[NFTA_SET_EXPR]) { 4559 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]); 4560 if (IS_ERR(expr)) { 4561 err = PTR_ERR(expr); 4562 goto err_set_expr_alloc; 4563 } 4564 set->exprs[0] = expr; 4565 set->num_exprs++; 4566 } else if (nla[NFTA_SET_EXPRESSIONS]) { 4567 struct nft_expr *expr; 4568 struct nlattr *tmp; 4569 int left; 4570 4571 if (!(flags & NFT_SET_EXPR)) { 4572 err = -EINVAL; 4573 goto err_set_expr_alloc; 4574 } 4575 i = 0; 4576 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) { 4577 if (i == NFT_SET_EXPR_MAX) { 4578 err = -E2BIG; 4579 goto err_set_expr_alloc; 4580 } 4581 if (nla_type(tmp) != NFTA_LIST_ELEM) { 4582 err = -EINVAL; 4583 goto err_set_expr_alloc; 4584 } 4585 expr = nft_set_elem_expr_alloc(&ctx, set, tmp); 4586 if (IS_ERR(expr)) { 4587 err = PTR_ERR(expr); 4588 goto err_set_expr_alloc; 4589 } 4590 set->exprs[i++] = expr; 4591 set->num_exprs++; 4592 } 4593 } 4594 4595 set->handle = nf_tables_alloc_handle(table); 4596 4597 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); 4598 if (err < 0) 4599 goto err_set_expr_alloc; 4600 4601 list_add_tail_rcu(&set->list, &table->sets); 4602 table->use++; 4603 return 0; 4604 4605 err_set_expr_alloc: 4606 for (i = 0; i < set->num_exprs; i++) 4607 nft_expr_destroy(&ctx, set->exprs[i]); 4608 4609 ops->destroy(set); 4610 err_set_init: 4611 kfree(set->name); 4612 err_set_name: 4613 kvfree(set); 4614 return err; 4615 } 4616 4617 struct nft_set_elem_catchall { 4618 struct list_head list; 4619 struct rcu_head rcu; 4620 void *elem; 4621 }; 4622 4623 static void nft_set_catchall_destroy(const struct nft_ctx *ctx, 4624 struct nft_set *set) 4625 { 4626 struct nft_set_elem_catchall *next, *catchall; 4627 4628 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { 4629 list_del_rcu(&catchall->list); 4630 nft_set_elem_destroy(set, catchall->elem, true); 4631 kfree_rcu(catchall, rcu); 4632 } 4633 } 4634 4635 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) 4636 { 4637 int i; 4638 4639 if (WARN_ON(set->use > 0)) 4640 return; 4641 4642 for (i = 0; i < set->num_exprs; i++) 4643 nft_expr_destroy(ctx, set->exprs[i]); 4644 4645 set->ops->destroy(set); 4646 nft_set_catchall_destroy(ctx, set); 4647 kfree(set->name); 4648 kvfree(set); 4649 } 4650 4651 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info, 4652 const struct nlattr * const nla[]) 4653 { 4654 struct netlink_ext_ack *extack = info->extack; 4655 u8 genmask = nft_genmask_next(info->net); 4656 u8 family = info->nfmsg->nfgen_family; 4657 struct net *net = info->net; 4658 const struct nlattr *attr; 4659 struct nft_table *table; 4660 struct nft_set *set; 4661 struct nft_ctx ctx; 4662 4663 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC) 4664 return -EAFNOSUPPORT; 4665 4666 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, 4667 genmask, NETLINK_CB(skb).portid); 4668 if (IS_ERR(table)) { 4669 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4670 return PTR_ERR(table); 4671 } 4672 4673 if (nla[NFTA_SET_HANDLE]) { 4674 attr = nla[NFTA_SET_HANDLE]; 4675 set = nft_set_lookup_byhandle(table, attr, genmask); 4676 } else { 4677 attr = nla[NFTA_SET_NAME]; 4678 set = nft_set_lookup(table, attr, genmask); 4679 } 4680 4681 if (IS_ERR(set)) { 4682 NL_SET_BAD_ATTR(extack, attr); 4683 return PTR_ERR(set); 4684 } 4685 if (set->use || 4686 (info->nlh->nlmsg_flags & NLM_F_NONREC && 4687 atomic_read(&set->nelems) > 0)) { 4688 NL_SET_BAD_ATTR(extack, attr); 4689 return -EBUSY; 4690 } 4691 4692 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4693 4694 return nft_delset(&ctx, set); 4695 } 4696 4697 static int nft_validate_register_store(const struct nft_ctx *ctx, 4698 enum nft_registers reg, 4699 const struct nft_data *data, 4700 enum nft_data_types type, 4701 unsigned int len); 4702 4703 static int nft_setelem_data_validate(const struct nft_ctx *ctx, 4704 struct nft_set *set, 4705 struct nft_set_elem *elem) 4706 { 4707 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 4708 enum nft_registers dreg; 4709 4710 dreg = nft_type_to_reg(set->dtype); 4711 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), 4712 set->dtype == NFT_DATA_VERDICT ? 4713 NFT_DATA_VERDICT : NFT_DATA_VALUE, 4714 set->dlen); 4715 } 4716 4717 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, 4718 struct nft_set *set, 4719 const struct nft_set_iter *iter, 4720 struct nft_set_elem *elem) 4721 { 4722 return nft_setelem_data_validate(ctx, set, elem); 4723 } 4724 4725 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx, 4726 struct nft_set *set) 4727 { 4728 u8 genmask = nft_genmask_next(ctx->net); 4729 struct nft_set_elem_catchall *catchall; 4730 struct nft_set_elem elem; 4731 struct nft_set_ext *ext; 4732 int ret = 0; 4733 4734 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 4735 ext = nft_set_elem_ext(set, catchall->elem); 4736 if (!nft_set_elem_active(ext, genmask)) 4737 continue; 4738 4739 elem.priv = catchall->elem; 4740 ret = nft_setelem_data_validate(ctx, set, &elem); 4741 if (ret < 0) 4742 break; 4743 } 4744 4745 return ret; 4746 } 4747 4748 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, 4749 struct nft_set_binding *binding) 4750 { 4751 struct nft_set_binding *i; 4752 struct nft_set_iter iter; 4753 4754 if (set->use == UINT_MAX) 4755 return -EOVERFLOW; 4756 4757 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set)) 4758 return -EBUSY; 4759 4760 if (binding->flags & NFT_SET_MAP) { 4761 /* If the set is already bound to the same chain all 4762 * jumps are already validated for that chain. 4763 */ 4764 list_for_each_entry(i, &set->bindings, list) { 4765 if (i->flags & NFT_SET_MAP && 4766 i->chain == binding->chain) 4767 goto bind; 4768 } 4769 4770 iter.genmask = nft_genmask_next(ctx->net); 4771 iter.skip = 0; 4772 iter.count = 0; 4773 iter.err = 0; 4774 iter.fn = nf_tables_bind_check_setelem; 4775 4776 set->ops->walk(ctx, set, &iter); 4777 if (!iter.err) 4778 iter.err = nft_set_catchall_bind_check(ctx, set); 4779 4780 if (iter.err < 0) 4781 return iter.err; 4782 } 4783 bind: 4784 binding->chain = ctx->chain; 4785 list_add_tail_rcu(&binding->list, &set->bindings); 4786 nft_set_trans_bind(ctx, set); 4787 set->use++; 4788 4789 return 0; 4790 } 4791 EXPORT_SYMBOL_GPL(nf_tables_bind_set); 4792 4793 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, 4794 struct nft_set_binding *binding, bool event) 4795 { 4796 list_del_rcu(&binding->list); 4797 4798 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) { 4799 list_del_rcu(&set->list); 4800 if (event) 4801 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, 4802 GFP_KERNEL); 4803 } 4804 } 4805 4806 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, 4807 struct nft_set_binding *binding, 4808 enum nft_trans_phase phase) 4809 { 4810 switch (phase) { 4811 case NFT_TRANS_PREPARE: 4812 set->use--; 4813 return; 4814 case NFT_TRANS_ABORT: 4815 case NFT_TRANS_RELEASE: 4816 set->use--; 4817 fallthrough; 4818 default: 4819 nf_tables_unbind_set(ctx, set, binding, 4820 phase == NFT_TRANS_COMMIT); 4821 } 4822 } 4823 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set); 4824 4825 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set) 4826 { 4827 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) 4828 nft_set_destroy(ctx, set); 4829 } 4830 EXPORT_SYMBOL_GPL(nf_tables_destroy_set); 4831 4832 const struct nft_set_ext_type nft_set_ext_types[] = { 4833 [NFT_SET_EXT_KEY] = { 4834 .align = __alignof__(u32), 4835 }, 4836 [NFT_SET_EXT_DATA] = { 4837 .align = __alignof__(u32), 4838 }, 4839 [NFT_SET_EXT_EXPRESSIONS] = { 4840 .align = __alignof__(struct nft_set_elem_expr), 4841 }, 4842 [NFT_SET_EXT_OBJREF] = { 4843 .len = sizeof(struct nft_object *), 4844 .align = __alignof__(struct nft_object *), 4845 }, 4846 [NFT_SET_EXT_FLAGS] = { 4847 .len = sizeof(u8), 4848 .align = __alignof__(u8), 4849 }, 4850 [NFT_SET_EXT_TIMEOUT] = { 4851 .len = sizeof(u64), 4852 .align = __alignof__(u64), 4853 }, 4854 [NFT_SET_EXT_EXPIRATION] = { 4855 .len = sizeof(u64), 4856 .align = __alignof__(u64), 4857 }, 4858 [NFT_SET_EXT_USERDATA] = { 4859 .len = sizeof(struct nft_userdata), 4860 .align = __alignof__(struct nft_userdata), 4861 }, 4862 [NFT_SET_EXT_KEY_END] = { 4863 .align = __alignof__(u32), 4864 }, 4865 }; 4866 4867 /* 4868 * Set elements 4869 */ 4870 4871 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { 4872 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, 4873 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, 4874 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, 4875 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, 4876 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 }, 4877 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, 4878 .len = NFT_USERDATA_MAXLEN }, 4879 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED }, 4880 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING, 4881 .len = NFT_OBJ_MAXNAMELEN - 1 }, 4882 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED }, 4883 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED }, 4884 }; 4885 4886 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { 4887 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, 4888 .len = NFT_TABLE_MAXNAMELEN - 1 }, 4889 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, 4890 .len = NFT_SET_MAXNAMELEN - 1 }, 4891 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, 4892 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, 4893 }; 4894 4895 static int nft_set_elem_expr_dump(struct sk_buff *skb, 4896 const struct nft_set *set, 4897 const struct nft_set_ext *ext) 4898 { 4899 struct nft_set_elem_expr *elem_expr; 4900 u32 size, num_exprs = 0; 4901 struct nft_expr *expr; 4902 struct nlattr *nest; 4903 4904 elem_expr = nft_set_ext_expr(ext); 4905 nft_setelem_expr_foreach(expr, elem_expr, size) 4906 num_exprs++; 4907 4908 if (num_exprs == 1) { 4909 expr = nft_setelem_expr_at(elem_expr, 0); 4910 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0) 4911 return -1; 4912 4913 return 0; 4914 } else if (num_exprs > 1) { 4915 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS); 4916 if (nest == NULL) 4917 goto nla_put_failure; 4918 4919 nft_setelem_expr_foreach(expr, elem_expr, size) { 4920 expr = nft_setelem_expr_at(elem_expr, size); 4921 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) 4922 goto nla_put_failure; 4923 } 4924 nla_nest_end(skb, nest); 4925 } 4926 return 0; 4927 4928 nla_put_failure: 4929 return -1; 4930 } 4931 4932 static int nf_tables_fill_setelem(struct sk_buff *skb, 4933 const struct nft_set *set, 4934 const struct nft_set_elem *elem) 4935 { 4936 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 4937 unsigned char *b = skb_tail_pointer(skb); 4938 struct nlattr *nest; 4939 4940 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM); 4941 if (nest == NULL) 4942 goto nla_put_failure; 4943 4944 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) && 4945 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), 4946 NFT_DATA_VALUE, set->klen) < 0) 4947 goto nla_put_failure; 4948 4949 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) && 4950 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext), 4951 NFT_DATA_VALUE, set->klen) < 0) 4952 goto nla_put_failure; 4953 4954 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && 4955 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), 4956 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, 4957 set->dlen) < 0) 4958 goto nla_put_failure; 4959 4960 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) && 4961 nft_set_elem_expr_dump(skb, set, ext)) 4962 goto nla_put_failure; 4963 4964 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && 4965 nla_put_string(skb, NFTA_SET_ELEM_OBJREF, 4966 (*nft_set_ext_obj(ext))->key.name) < 0) 4967 goto nla_put_failure; 4968 4969 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 4970 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, 4971 htonl(*nft_set_ext_flags(ext)))) 4972 goto nla_put_failure; 4973 4974 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && 4975 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, 4976 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)), 4977 NFTA_SET_ELEM_PAD)) 4978 goto nla_put_failure; 4979 4980 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { 4981 u64 expires, now = get_jiffies_64(); 4982 4983 expires = *nft_set_ext_expiration(ext); 4984 if (time_before64(now, expires)) 4985 expires -= now; 4986 else 4987 expires = 0; 4988 4989 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, 4990 nf_jiffies64_to_msecs(expires), 4991 NFTA_SET_ELEM_PAD)) 4992 goto nla_put_failure; 4993 } 4994 4995 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { 4996 struct nft_userdata *udata; 4997 4998 udata = nft_set_ext_userdata(ext); 4999 if (nla_put(skb, NFTA_SET_ELEM_USERDATA, 5000 udata->len + 1, udata->data)) 5001 goto nla_put_failure; 5002 } 5003 5004 nla_nest_end(skb, nest); 5005 return 0; 5006 5007 nla_put_failure: 5008 nlmsg_trim(skb, b); 5009 return -EMSGSIZE; 5010 } 5011 5012 struct nft_set_dump_args { 5013 const struct netlink_callback *cb; 5014 struct nft_set_iter iter; 5015 struct sk_buff *skb; 5016 }; 5017 5018 static int nf_tables_dump_setelem(const struct nft_ctx *ctx, 5019 struct nft_set *set, 5020 const struct nft_set_iter *iter, 5021 struct nft_set_elem *elem) 5022 { 5023 struct nft_set_dump_args *args; 5024 5025 args = container_of(iter, struct nft_set_dump_args, iter); 5026 return nf_tables_fill_setelem(args->skb, set, elem); 5027 } 5028 5029 struct nft_set_dump_ctx { 5030 const struct nft_set *set; 5031 struct nft_ctx ctx; 5032 }; 5033 5034 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb, 5035 const struct nft_set *set) 5036 { 5037 struct nft_set_elem_catchall *catchall; 5038 u8 genmask = nft_genmask_cur(net); 5039 struct nft_set_elem elem; 5040 struct nft_set_ext *ext; 5041 int ret = 0; 5042 5043 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 5044 ext = nft_set_elem_ext(set, catchall->elem); 5045 if (!nft_set_elem_active(ext, genmask) || 5046 nft_set_elem_expired(ext)) 5047 continue; 5048 5049 elem.priv = catchall->elem; 5050 ret = nf_tables_fill_setelem(skb, set, &elem); 5051 break; 5052 } 5053 5054 return ret; 5055 } 5056 5057 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) 5058 { 5059 struct nft_set_dump_ctx *dump_ctx = cb->data; 5060 struct net *net = sock_net(skb->sk); 5061 struct nftables_pernet *nft_net; 5062 struct nft_table *table; 5063 struct nft_set *set; 5064 struct nft_set_dump_args args; 5065 bool set_found = false; 5066 struct nlmsghdr *nlh; 5067 struct nlattr *nest; 5068 u32 portid, seq; 5069 int event; 5070 5071 rcu_read_lock(); 5072 nft_net = nft_pernet(net); 5073 cb->seq = READ_ONCE(nft_net->base_seq); 5074 5075 list_for_each_entry_rcu(table, &nft_net->tables, list) { 5076 if (dump_ctx->ctx.family != NFPROTO_UNSPEC && 5077 dump_ctx->ctx.family != table->family) 5078 continue; 5079 5080 if (table != dump_ctx->ctx.table) 5081 continue; 5082 5083 list_for_each_entry_rcu(set, &table->sets, list) { 5084 if (set == dump_ctx->set) { 5085 set_found = true; 5086 break; 5087 } 5088 } 5089 break; 5090 } 5091 5092 if (!set_found) { 5093 rcu_read_unlock(); 5094 return -ENOENT; 5095 } 5096 5097 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); 5098 portid = NETLINK_CB(cb->skb).portid; 5099 seq = cb->nlh->nlmsg_seq; 5100 5101 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI, 5102 table->family, NFNETLINK_V0, nft_base_seq(net)); 5103 if (!nlh) 5104 goto nla_put_failure; 5105 5106 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) 5107 goto nla_put_failure; 5108 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) 5109 goto nla_put_failure; 5110 5111 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS); 5112 if (nest == NULL) 5113 goto nla_put_failure; 5114 5115 args.cb = cb; 5116 args.skb = skb; 5117 args.iter.genmask = nft_genmask_cur(net); 5118 args.iter.skip = cb->args[0]; 5119 args.iter.count = 0; 5120 args.iter.err = 0; 5121 args.iter.fn = nf_tables_dump_setelem; 5122 set->ops->walk(&dump_ctx->ctx, set, &args.iter); 5123 5124 if (!args.iter.err && args.iter.count == cb->args[0]) 5125 args.iter.err = nft_set_catchall_dump(net, skb, set); 5126 rcu_read_unlock(); 5127 5128 nla_nest_end(skb, nest); 5129 nlmsg_end(skb, nlh); 5130 5131 if (args.iter.err && args.iter.err != -EMSGSIZE) 5132 return args.iter.err; 5133 if (args.iter.count == cb->args[0]) 5134 return 0; 5135 5136 cb->args[0] = args.iter.count; 5137 return skb->len; 5138 5139 nla_put_failure: 5140 rcu_read_unlock(); 5141 return -ENOSPC; 5142 } 5143 5144 static int nf_tables_dump_set_start(struct netlink_callback *cb) 5145 { 5146 struct nft_set_dump_ctx *dump_ctx = cb->data; 5147 5148 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC); 5149 5150 return cb->data ? 0 : -ENOMEM; 5151 } 5152 5153 static int nf_tables_dump_set_done(struct netlink_callback *cb) 5154 { 5155 kfree(cb->data); 5156 return 0; 5157 } 5158 5159 static int nf_tables_fill_setelem_info(struct sk_buff *skb, 5160 const struct nft_ctx *ctx, u32 seq, 5161 u32 portid, int event, u16 flags, 5162 const struct nft_set *set, 5163 const struct nft_set_elem *elem) 5164 { 5165 struct nlmsghdr *nlh; 5166 struct nlattr *nest; 5167 int err; 5168 5169 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 5170 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family, 5171 NFNETLINK_V0, nft_base_seq(ctx->net)); 5172 if (!nlh) 5173 goto nla_put_failure; 5174 5175 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) 5176 goto nla_put_failure; 5177 if (nla_put_string(skb, NFTA_SET_NAME, set->name)) 5178 goto nla_put_failure; 5179 5180 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS); 5181 if (nest == NULL) 5182 goto nla_put_failure; 5183 5184 err = nf_tables_fill_setelem(skb, set, elem); 5185 if (err < 0) 5186 goto nla_put_failure; 5187 5188 nla_nest_end(skb, nest); 5189 5190 nlmsg_end(skb, nlh); 5191 return 0; 5192 5193 nla_put_failure: 5194 nlmsg_trim(skb, nlh); 5195 return -1; 5196 } 5197 5198 static int nft_setelem_parse_flags(const struct nft_set *set, 5199 const struct nlattr *attr, u32 *flags) 5200 { 5201 if (attr == NULL) 5202 return 0; 5203 5204 *flags = ntohl(nla_get_be32(attr)); 5205 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) 5206 return -EOPNOTSUPP; 5207 if (!(set->flags & NFT_SET_INTERVAL) && 5208 *flags & NFT_SET_ELEM_INTERVAL_END) 5209 return -EINVAL; 5210 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) == 5211 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) 5212 return -EINVAL; 5213 5214 return 0; 5215 } 5216 5217 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set, 5218 struct nft_data *key, struct nlattr *attr) 5219 { 5220 struct nft_data_desc desc = { 5221 .type = NFT_DATA_VALUE, 5222 .size = NFT_DATA_VALUE_MAXLEN, 5223 .len = set->klen, 5224 }; 5225 5226 return nft_data_init(ctx, key, &desc, attr); 5227 } 5228 5229 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set, 5230 struct nft_data_desc *desc, 5231 struct nft_data *data, 5232 struct nlattr *attr) 5233 { 5234 u32 dtype; 5235 5236 if (set->dtype == NFT_DATA_VERDICT) 5237 dtype = NFT_DATA_VERDICT; 5238 else 5239 dtype = NFT_DATA_VALUE; 5240 5241 desc->type = dtype; 5242 desc->size = NFT_DATA_VALUE_MAXLEN; 5243 desc->len = set->dlen; 5244 desc->flags = NFT_DATA_DESC_SETELEM; 5245 5246 return nft_data_init(ctx, data, desc, attr); 5247 } 5248 5249 static void *nft_setelem_catchall_get(const struct net *net, 5250 const struct nft_set *set) 5251 { 5252 struct nft_set_elem_catchall *catchall; 5253 u8 genmask = nft_genmask_cur(net); 5254 struct nft_set_ext *ext; 5255 void *priv = NULL; 5256 5257 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 5258 ext = nft_set_elem_ext(set, catchall->elem); 5259 if (!nft_set_elem_active(ext, genmask) || 5260 nft_set_elem_expired(ext)) 5261 continue; 5262 5263 priv = catchall->elem; 5264 break; 5265 } 5266 5267 return priv; 5268 } 5269 5270 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set, 5271 struct nft_set_elem *elem, u32 flags) 5272 { 5273 void *priv; 5274 5275 if (!(flags & NFT_SET_ELEM_CATCHALL)) { 5276 priv = set->ops->get(ctx->net, set, elem, flags); 5277 if (IS_ERR(priv)) 5278 return PTR_ERR(priv); 5279 } else { 5280 priv = nft_setelem_catchall_get(ctx->net, set); 5281 if (!priv) 5282 return -ENOENT; 5283 } 5284 elem->priv = priv; 5285 5286 return 0; 5287 } 5288 5289 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set, 5290 const struct nlattr *attr) 5291 { 5292 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 5293 struct nft_set_elem elem; 5294 struct sk_buff *skb; 5295 uint32_t flags = 0; 5296 int err; 5297 5298 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 5299 nft_set_elem_policy, NULL); 5300 if (err < 0) 5301 return err; 5302 5303 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 5304 if (err < 0) 5305 return err; 5306 5307 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 5308 return -EINVAL; 5309 5310 if (nla[NFTA_SET_ELEM_KEY]) { 5311 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 5312 nla[NFTA_SET_ELEM_KEY]); 5313 if (err < 0) 5314 return err; 5315 } 5316 5317 if (nla[NFTA_SET_ELEM_KEY_END]) { 5318 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 5319 nla[NFTA_SET_ELEM_KEY_END]); 5320 if (err < 0) 5321 return err; 5322 } 5323 5324 err = nft_setelem_get(ctx, set, &elem, flags); 5325 if (err < 0) 5326 return err; 5327 5328 err = -ENOMEM; 5329 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); 5330 if (skb == NULL) 5331 return err; 5332 5333 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid, 5334 NFT_MSG_NEWSETELEM, 0, set, &elem); 5335 if (err < 0) 5336 goto err_fill_setelem; 5337 5338 return nfnetlink_unicast(skb, ctx->net, ctx->portid); 5339 5340 err_fill_setelem: 5341 kfree_skb(skb); 5342 return err; 5343 } 5344 5345 /* called with rcu_read_lock held */ 5346 static int nf_tables_getsetelem(struct sk_buff *skb, 5347 const struct nfnl_info *info, 5348 const struct nlattr * const nla[]) 5349 { 5350 struct netlink_ext_ack *extack = info->extack; 5351 u8 genmask = nft_genmask_cur(info->net); 5352 u8 family = info->nfmsg->nfgen_family; 5353 struct net *net = info->net; 5354 struct nft_table *table; 5355 struct nft_set *set; 5356 struct nlattr *attr; 5357 struct nft_ctx ctx; 5358 int rem, err = 0; 5359 5360 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 5361 genmask, NETLINK_CB(skb).portid); 5362 if (IS_ERR(table)) { 5363 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 5364 return PTR_ERR(table); 5365 } 5366 5367 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask); 5368 if (IS_ERR(set)) 5369 return PTR_ERR(set); 5370 5371 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 5372 5373 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 5374 struct netlink_dump_control c = { 5375 .start = nf_tables_dump_set_start, 5376 .dump = nf_tables_dump_set, 5377 .done = nf_tables_dump_set_done, 5378 .module = THIS_MODULE, 5379 }; 5380 struct nft_set_dump_ctx dump_ctx = { 5381 .set = set, 5382 .ctx = ctx, 5383 }; 5384 5385 c.data = &dump_ctx; 5386 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 5387 } 5388 5389 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) 5390 return -EINVAL; 5391 5392 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 5393 err = nft_get_set_elem(&ctx, set, attr); 5394 if (err < 0) { 5395 NL_SET_BAD_ATTR(extack, attr); 5396 break; 5397 } 5398 } 5399 5400 return err; 5401 } 5402 5403 static void nf_tables_setelem_notify(const struct nft_ctx *ctx, 5404 const struct nft_set *set, 5405 const struct nft_set_elem *elem, 5406 int event) 5407 { 5408 struct nftables_pernet *nft_net; 5409 struct net *net = ctx->net; 5410 u32 portid = ctx->portid; 5411 struct sk_buff *skb; 5412 u16 flags = 0; 5413 int err; 5414 5415 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 5416 return; 5417 5418 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 5419 if (skb == NULL) 5420 goto err; 5421 5422 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 5423 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 5424 5425 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, 5426 set, elem); 5427 if (err < 0) { 5428 kfree_skb(skb); 5429 goto err; 5430 } 5431 5432 nft_net = nft_pernet(net); 5433 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 5434 return; 5435 err: 5436 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 5437 } 5438 5439 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, 5440 int msg_type, 5441 struct nft_set *set) 5442 { 5443 struct nft_trans *trans; 5444 5445 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); 5446 if (trans == NULL) 5447 return NULL; 5448 5449 nft_trans_elem_set(trans) = set; 5450 return trans; 5451 } 5452 5453 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx, 5454 const struct nft_set *set, 5455 const struct nlattr *attr) 5456 { 5457 struct nft_expr *expr; 5458 int err; 5459 5460 expr = nft_expr_init(ctx, attr); 5461 if (IS_ERR(expr)) 5462 return expr; 5463 5464 err = -EOPNOTSUPP; 5465 if (expr->ops->type->flags & NFT_EXPR_GC) { 5466 if (set->flags & NFT_SET_TIMEOUT) 5467 goto err_set_elem_expr; 5468 if (!set->ops->gc_init) 5469 goto err_set_elem_expr; 5470 set->ops->gc_init(set); 5471 } 5472 5473 return expr; 5474 5475 err_set_elem_expr: 5476 nft_expr_destroy(ctx, expr); 5477 return ERR_PTR(err); 5478 } 5479 5480 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len) 5481 { 5482 len += nft_set_ext_types[id].len; 5483 if (len > tmpl->ext_len[id] || 5484 len > U8_MAX) 5485 return -1; 5486 5487 return 0; 5488 } 5489 5490 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id, 5491 void *to, const void *from, u32 len) 5492 { 5493 if (nft_set_ext_check(tmpl, id, len) < 0) 5494 return -1; 5495 5496 memcpy(to, from, len); 5497 5498 return 0; 5499 } 5500 5501 void *nft_set_elem_init(const struct nft_set *set, 5502 const struct nft_set_ext_tmpl *tmpl, 5503 const u32 *key, const u32 *key_end, 5504 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp) 5505 { 5506 struct nft_set_ext *ext; 5507 void *elem; 5508 5509 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); 5510 if (elem == NULL) 5511 return ERR_PTR(-ENOMEM); 5512 5513 ext = nft_set_elem_ext(set, elem); 5514 nft_set_ext_init(ext, tmpl); 5515 5516 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) && 5517 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY, 5518 nft_set_ext_key(ext), key, set->klen) < 0) 5519 goto err_ext_check; 5520 5521 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) && 5522 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END, 5523 nft_set_ext_key_end(ext), key_end, set->klen) < 0) 5524 goto err_ext_check; 5525 5526 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && 5527 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA, 5528 nft_set_ext_data(ext), data, set->dlen) < 0) 5529 goto err_ext_check; 5530 5531 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { 5532 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration; 5533 if (expiration == 0) 5534 *nft_set_ext_expiration(ext) += timeout; 5535 } 5536 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) 5537 *nft_set_ext_timeout(ext) = timeout; 5538 5539 return elem; 5540 5541 err_ext_check: 5542 kfree(elem); 5543 5544 return ERR_PTR(-EINVAL); 5545 } 5546 5547 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx, 5548 struct nft_expr *expr) 5549 { 5550 if (expr->ops->destroy_clone) { 5551 expr->ops->destroy_clone(ctx, expr); 5552 module_put(expr->ops->type->owner); 5553 } else { 5554 nf_tables_expr_destroy(ctx, expr); 5555 } 5556 } 5557 5558 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx, 5559 struct nft_set_elem_expr *elem_expr) 5560 { 5561 struct nft_expr *expr; 5562 u32 size; 5563 5564 nft_setelem_expr_foreach(expr, elem_expr, size) 5565 __nft_set_elem_expr_destroy(ctx, expr); 5566 } 5567 5568 void nft_set_elem_destroy(const struct nft_set *set, void *elem, 5569 bool destroy_expr) 5570 { 5571 struct nft_set_ext *ext = nft_set_elem_ext(set, elem); 5572 struct nft_ctx ctx = { 5573 .net = read_pnet(&set->net), 5574 .family = set->table->family, 5575 }; 5576 5577 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); 5578 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 5579 nft_data_release(nft_set_ext_data(ext), set->dtype); 5580 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) 5581 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext)); 5582 5583 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 5584 (*nft_set_ext_obj(ext))->use--; 5585 kfree(elem); 5586 } 5587 EXPORT_SYMBOL_GPL(nft_set_elem_destroy); 5588 5589 /* Only called from commit path, nft_setelem_data_deactivate() already deals 5590 * with the refcounting from the preparation phase. 5591 */ 5592 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, 5593 const struct nft_set *set, void *elem) 5594 { 5595 struct nft_set_ext *ext = nft_set_elem_ext(set, elem); 5596 5597 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) 5598 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext)); 5599 5600 kfree(elem); 5601 } 5602 5603 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, 5604 struct nft_expr *expr_array[]) 5605 { 5606 struct nft_expr *expr; 5607 int err, i, k; 5608 5609 for (i = 0; i < set->num_exprs; i++) { 5610 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT); 5611 if (!expr) 5612 goto err_expr; 5613 5614 err = nft_expr_clone(expr, set->exprs[i]); 5615 if (err < 0) { 5616 kfree(expr); 5617 goto err_expr; 5618 } 5619 expr_array[i] = expr; 5620 } 5621 5622 return 0; 5623 5624 err_expr: 5625 for (k = i - 1; k >= 0; k--) 5626 nft_expr_destroy(ctx, expr_array[k]); 5627 5628 return -ENOMEM; 5629 } 5630 5631 static int nft_set_elem_expr_setup(struct nft_ctx *ctx, 5632 const struct nft_set_ext_tmpl *tmpl, 5633 const struct nft_set_ext *ext, 5634 struct nft_expr *expr_array[], 5635 u32 num_exprs) 5636 { 5637 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext); 5638 u32 len = sizeof(struct nft_set_elem_expr); 5639 struct nft_expr *expr; 5640 int i, err; 5641 5642 if (num_exprs == 0) 5643 return 0; 5644 5645 for (i = 0; i < num_exprs; i++) 5646 len += expr_array[i]->ops->size; 5647 5648 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0) 5649 return -EINVAL; 5650 5651 for (i = 0; i < num_exprs; i++) { 5652 expr = nft_setelem_expr_at(elem_expr, elem_expr->size); 5653 err = nft_expr_clone(expr, expr_array[i]); 5654 if (err < 0) 5655 goto err_elem_expr_setup; 5656 5657 elem_expr->size += expr_array[i]->ops->size; 5658 nft_expr_destroy(ctx, expr_array[i]); 5659 expr_array[i] = NULL; 5660 } 5661 5662 return 0; 5663 5664 err_elem_expr_setup: 5665 for (; i < num_exprs; i++) { 5666 nft_expr_destroy(ctx, expr_array[i]); 5667 expr_array[i] = NULL; 5668 } 5669 5670 return -ENOMEM; 5671 } 5672 5673 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net, 5674 const struct nft_set *set) 5675 { 5676 struct nft_set_elem_catchall *catchall; 5677 u8 genmask = nft_genmask_cur(net); 5678 struct nft_set_ext *ext; 5679 5680 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 5681 ext = nft_set_elem_ext(set, catchall->elem); 5682 if (nft_set_elem_active(ext, genmask) && 5683 !nft_set_elem_expired(ext)) 5684 return ext; 5685 } 5686 5687 return NULL; 5688 } 5689 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup); 5690 5691 void *nft_set_catchall_gc(const struct nft_set *set) 5692 { 5693 struct nft_set_elem_catchall *catchall, *next; 5694 struct nft_set_ext *ext; 5695 void *elem = NULL; 5696 5697 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { 5698 ext = nft_set_elem_ext(set, catchall->elem); 5699 5700 if (!nft_set_elem_expired(ext) || 5701 nft_set_elem_mark_busy(ext)) 5702 continue; 5703 5704 elem = catchall->elem; 5705 list_del_rcu(&catchall->list); 5706 kfree_rcu(catchall, rcu); 5707 break; 5708 } 5709 5710 return elem; 5711 } 5712 EXPORT_SYMBOL_GPL(nft_set_catchall_gc); 5713 5714 static int nft_setelem_catchall_insert(const struct net *net, 5715 struct nft_set *set, 5716 const struct nft_set_elem *elem, 5717 struct nft_set_ext **pext) 5718 { 5719 struct nft_set_elem_catchall *catchall; 5720 u8 genmask = nft_genmask_next(net); 5721 struct nft_set_ext *ext; 5722 5723 list_for_each_entry(catchall, &set->catchall_list, list) { 5724 ext = nft_set_elem_ext(set, catchall->elem); 5725 if (nft_set_elem_active(ext, genmask)) { 5726 *pext = ext; 5727 return -EEXIST; 5728 } 5729 } 5730 5731 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL); 5732 if (!catchall) 5733 return -ENOMEM; 5734 5735 catchall->elem = elem->priv; 5736 list_add_tail_rcu(&catchall->list, &set->catchall_list); 5737 5738 return 0; 5739 } 5740 5741 static int nft_setelem_insert(const struct net *net, 5742 struct nft_set *set, 5743 const struct nft_set_elem *elem, 5744 struct nft_set_ext **ext, unsigned int flags) 5745 { 5746 int ret; 5747 5748 if (flags & NFT_SET_ELEM_CATCHALL) 5749 ret = nft_setelem_catchall_insert(net, set, elem, ext); 5750 else 5751 ret = set->ops->insert(net, set, elem, ext); 5752 5753 return ret; 5754 } 5755 5756 static bool nft_setelem_is_catchall(const struct nft_set *set, 5757 const struct nft_set_elem *elem) 5758 { 5759 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 5760 5761 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 5762 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL) 5763 return true; 5764 5765 return false; 5766 } 5767 5768 static void nft_setelem_activate(struct net *net, struct nft_set *set, 5769 struct nft_set_elem *elem) 5770 { 5771 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 5772 5773 if (nft_setelem_is_catchall(set, elem)) { 5774 nft_set_elem_change_active(net, set, ext); 5775 nft_set_elem_clear_busy(ext); 5776 } else { 5777 set->ops->activate(net, set, elem); 5778 } 5779 } 5780 5781 static int nft_setelem_catchall_deactivate(const struct net *net, 5782 struct nft_set *set, 5783 struct nft_set_elem *elem) 5784 { 5785 struct nft_set_elem_catchall *catchall; 5786 struct nft_set_ext *ext; 5787 5788 list_for_each_entry(catchall, &set->catchall_list, list) { 5789 ext = nft_set_elem_ext(set, catchall->elem); 5790 if (!nft_is_active(net, ext) || 5791 nft_set_elem_mark_busy(ext)) 5792 continue; 5793 5794 kfree(elem->priv); 5795 elem->priv = catchall->elem; 5796 nft_set_elem_change_active(net, set, ext); 5797 return 0; 5798 } 5799 5800 return -ENOENT; 5801 } 5802 5803 static int __nft_setelem_deactivate(const struct net *net, 5804 struct nft_set *set, 5805 struct nft_set_elem *elem) 5806 { 5807 void *priv; 5808 5809 priv = set->ops->deactivate(net, set, elem); 5810 if (!priv) 5811 return -ENOENT; 5812 5813 kfree(elem->priv); 5814 elem->priv = priv; 5815 set->ndeact++; 5816 5817 return 0; 5818 } 5819 5820 static int nft_setelem_deactivate(const struct net *net, 5821 struct nft_set *set, 5822 struct nft_set_elem *elem, u32 flags) 5823 { 5824 int ret; 5825 5826 if (flags & NFT_SET_ELEM_CATCHALL) 5827 ret = nft_setelem_catchall_deactivate(net, set, elem); 5828 else 5829 ret = __nft_setelem_deactivate(net, set, elem); 5830 5831 return ret; 5832 } 5833 5834 static void nft_setelem_catchall_remove(const struct net *net, 5835 const struct nft_set *set, 5836 const struct nft_set_elem *elem) 5837 { 5838 struct nft_set_elem_catchall *catchall, *next; 5839 5840 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { 5841 if (catchall->elem == elem->priv) { 5842 list_del_rcu(&catchall->list); 5843 kfree_rcu(catchall, rcu); 5844 break; 5845 } 5846 } 5847 } 5848 5849 static void nft_setelem_remove(const struct net *net, 5850 const struct nft_set *set, 5851 const struct nft_set_elem *elem) 5852 { 5853 if (nft_setelem_is_catchall(set, elem)) 5854 nft_setelem_catchall_remove(net, set, elem); 5855 else 5856 set->ops->remove(net, set, elem); 5857 } 5858 5859 static bool nft_setelem_valid_key_end(const struct nft_set *set, 5860 struct nlattr **nla, u32 flags) 5861 { 5862 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) == 5863 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) { 5864 if (flags & NFT_SET_ELEM_INTERVAL_END) 5865 return false; 5866 if (!nla[NFTA_SET_ELEM_KEY_END] && 5867 !(flags & NFT_SET_ELEM_CATCHALL)) 5868 return false; 5869 } else { 5870 if (nla[NFTA_SET_ELEM_KEY_END]) 5871 return false; 5872 } 5873 5874 return true; 5875 } 5876 5877 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, 5878 const struct nlattr *attr, u32 nlmsg_flags) 5879 { 5880 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {}; 5881 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 5882 u8 genmask = nft_genmask_next(ctx->net); 5883 u32 flags = 0, size = 0, num_exprs = 0; 5884 struct nft_set_ext_tmpl tmpl; 5885 struct nft_set_ext *ext, *ext2; 5886 struct nft_set_elem elem; 5887 struct nft_set_binding *binding; 5888 struct nft_object *obj = NULL; 5889 struct nft_userdata *udata; 5890 struct nft_data_desc desc; 5891 enum nft_registers dreg; 5892 struct nft_trans *trans; 5893 u64 timeout; 5894 u64 expiration; 5895 int err, i; 5896 u8 ulen; 5897 5898 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 5899 nft_set_elem_policy, NULL); 5900 if (err < 0) 5901 return err; 5902 5903 nft_set_ext_prepare(&tmpl); 5904 5905 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 5906 if (err < 0) 5907 return err; 5908 5909 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 5910 return -EINVAL; 5911 5912 if (flags != 0) { 5913 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); 5914 if (err < 0) 5915 return err; 5916 } 5917 5918 if (set->flags & NFT_SET_MAP) { 5919 if (nla[NFTA_SET_ELEM_DATA] == NULL && 5920 !(flags & NFT_SET_ELEM_INTERVAL_END)) 5921 return -EINVAL; 5922 } else { 5923 if (nla[NFTA_SET_ELEM_DATA] != NULL) 5924 return -EINVAL; 5925 } 5926 5927 if (set->flags & NFT_SET_OBJECT) { 5928 if (!nla[NFTA_SET_ELEM_OBJREF] && 5929 !(flags & NFT_SET_ELEM_INTERVAL_END)) 5930 return -EINVAL; 5931 } else { 5932 if (nla[NFTA_SET_ELEM_OBJREF]) 5933 return -EINVAL; 5934 } 5935 5936 if (!nft_setelem_valid_key_end(set, nla, flags)) 5937 return -EINVAL; 5938 5939 if ((flags & NFT_SET_ELEM_INTERVAL_END) && 5940 (nla[NFTA_SET_ELEM_DATA] || 5941 nla[NFTA_SET_ELEM_OBJREF] || 5942 nla[NFTA_SET_ELEM_TIMEOUT] || 5943 nla[NFTA_SET_ELEM_EXPIRATION] || 5944 nla[NFTA_SET_ELEM_USERDATA] || 5945 nla[NFTA_SET_ELEM_EXPR] || 5946 nla[NFTA_SET_ELEM_KEY_END] || 5947 nla[NFTA_SET_ELEM_EXPRESSIONS])) 5948 return -EINVAL; 5949 5950 timeout = 0; 5951 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { 5952 if (!(set->flags & NFT_SET_TIMEOUT)) 5953 return -EINVAL; 5954 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT], 5955 &timeout); 5956 if (err) 5957 return err; 5958 } else if (set->flags & NFT_SET_TIMEOUT) { 5959 timeout = set->timeout; 5960 } 5961 5962 expiration = 0; 5963 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) { 5964 if (!(set->flags & NFT_SET_TIMEOUT)) 5965 return -EINVAL; 5966 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION], 5967 &expiration); 5968 if (err) 5969 return err; 5970 } 5971 5972 if (nla[NFTA_SET_ELEM_EXPR]) { 5973 struct nft_expr *expr; 5974 5975 if (set->num_exprs && set->num_exprs != 1) 5976 return -EOPNOTSUPP; 5977 5978 expr = nft_set_elem_expr_alloc(ctx, set, 5979 nla[NFTA_SET_ELEM_EXPR]); 5980 if (IS_ERR(expr)) 5981 return PTR_ERR(expr); 5982 5983 expr_array[0] = expr; 5984 num_exprs = 1; 5985 5986 if (set->num_exprs && set->exprs[0]->ops != expr->ops) { 5987 err = -EOPNOTSUPP; 5988 goto err_set_elem_expr; 5989 } 5990 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) { 5991 struct nft_expr *expr; 5992 struct nlattr *tmp; 5993 int left; 5994 5995 i = 0; 5996 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) { 5997 if (i == NFT_SET_EXPR_MAX || 5998 (set->num_exprs && set->num_exprs == i)) { 5999 err = -E2BIG; 6000 goto err_set_elem_expr; 6001 } 6002 if (nla_type(tmp) != NFTA_LIST_ELEM) { 6003 err = -EINVAL; 6004 goto err_set_elem_expr; 6005 } 6006 expr = nft_set_elem_expr_alloc(ctx, set, tmp); 6007 if (IS_ERR(expr)) { 6008 err = PTR_ERR(expr); 6009 goto err_set_elem_expr; 6010 } 6011 expr_array[i] = expr; 6012 num_exprs++; 6013 6014 if (set->num_exprs && expr->ops != set->exprs[i]->ops) { 6015 err = -EOPNOTSUPP; 6016 goto err_set_elem_expr; 6017 } 6018 i++; 6019 } 6020 if (set->num_exprs && set->num_exprs != i) { 6021 err = -EOPNOTSUPP; 6022 goto err_set_elem_expr; 6023 } 6024 } else if (set->num_exprs > 0) { 6025 err = nft_set_elem_expr_clone(ctx, set, expr_array); 6026 if (err < 0) 6027 goto err_set_elem_expr_clone; 6028 6029 num_exprs = set->num_exprs; 6030 } 6031 6032 if (nla[NFTA_SET_ELEM_KEY]) { 6033 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 6034 nla[NFTA_SET_ELEM_KEY]); 6035 if (err < 0) 6036 goto err_set_elem_expr; 6037 6038 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen); 6039 if (err < 0) 6040 goto err_parse_key; 6041 } 6042 6043 if (nla[NFTA_SET_ELEM_KEY_END]) { 6044 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 6045 nla[NFTA_SET_ELEM_KEY_END]); 6046 if (err < 0) 6047 goto err_parse_key; 6048 6049 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen); 6050 if (err < 0) 6051 goto err_parse_key_end; 6052 } 6053 6054 if (timeout > 0) { 6055 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); 6056 if (err < 0) 6057 goto err_parse_key_end; 6058 6059 if (timeout != set->timeout) { 6060 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); 6061 if (err < 0) 6062 goto err_parse_key_end; 6063 } 6064 } 6065 6066 if (num_exprs) { 6067 for (i = 0; i < num_exprs; i++) 6068 size += expr_array[i]->ops->size; 6069 6070 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS, 6071 sizeof(struct nft_set_elem_expr) + size); 6072 if (err < 0) 6073 goto err_parse_key_end; 6074 } 6075 6076 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { 6077 obj = nft_obj_lookup(ctx->net, ctx->table, 6078 nla[NFTA_SET_ELEM_OBJREF], 6079 set->objtype, genmask); 6080 if (IS_ERR(obj)) { 6081 err = PTR_ERR(obj); 6082 goto err_parse_key_end; 6083 } 6084 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); 6085 if (err < 0) 6086 goto err_parse_key_end; 6087 } 6088 6089 if (nla[NFTA_SET_ELEM_DATA] != NULL) { 6090 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val, 6091 nla[NFTA_SET_ELEM_DATA]); 6092 if (err < 0) 6093 goto err_parse_key_end; 6094 6095 dreg = nft_type_to_reg(set->dtype); 6096 list_for_each_entry(binding, &set->bindings, list) { 6097 struct nft_ctx bind_ctx = { 6098 .net = ctx->net, 6099 .family = ctx->family, 6100 .table = ctx->table, 6101 .chain = (struct nft_chain *)binding->chain, 6102 }; 6103 6104 if (!(binding->flags & NFT_SET_MAP)) 6105 continue; 6106 6107 err = nft_validate_register_store(&bind_ctx, dreg, 6108 &elem.data.val, 6109 desc.type, desc.len); 6110 if (err < 0) 6111 goto err_parse_data; 6112 6113 if (desc.type == NFT_DATA_VERDICT && 6114 (elem.data.val.verdict.code == NFT_GOTO || 6115 elem.data.val.verdict.code == NFT_JUMP)) 6116 nft_validate_state_update(ctx->net, 6117 NFT_VALIDATE_NEED); 6118 } 6119 6120 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len); 6121 if (err < 0) 6122 goto err_parse_data; 6123 } 6124 6125 /* The full maximum length of userdata can exceed the maximum 6126 * offset value (U8_MAX) for following extensions, therefor it 6127 * must be the last extension added. 6128 */ 6129 ulen = 0; 6130 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { 6131 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); 6132 if (ulen > 0) { 6133 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, 6134 ulen); 6135 if (err < 0) 6136 goto err_parse_data; 6137 } 6138 } 6139 6140 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, 6141 elem.key_end.val.data, elem.data.val.data, 6142 timeout, expiration, GFP_KERNEL_ACCOUNT); 6143 if (IS_ERR(elem.priv)) { 6144 err = PTR_ERR(elem.priv); 6145 goto err_parse_data; 6146 } 6147 6148 ext = nft_set_elem_ext(set, elem.priv); 6149 if (flags) 6150 *nft_set_ext_flags(ext) = flags; 6151 6152 if (ulen > 0) { 6153 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) { 6154 err = -EINVAL; 6155 goto err_elem_userdata; 6156 } 6157 udata = nft_set_ext_userdata(ext); 6158 udata->len = ulen - 1; 6159 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); 6160 } 6161 if (obj) { 6162 *nft_set_ext_obj(ext) = obj; 6163 obj->use++; 6164 } 6165 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs); 6166 if (err < 0) 6167 goto err_elem_free; 6168 6169 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); 6170 if (trans == NULL) { 6171 err = -ENOMEM; 6172 goto err_elem_free; 6173 } 6174 6175 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; 6176 6177 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags); 6178 if (err) { 6179 if (err == -EEXIST) { 6180 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ 6181 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || 6182 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ 6183 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) 6184 goto err_element_clash; 6185 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && 6186 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && 6187 memcmp(nft_set_ext_data(ext), 6188 nft_set_ext_data(ext2), set->dlen) != 0) || 6189 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && 6190 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && 6191 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) 6192 goto err_element_clash; 6193 else if (!(nlmsg_flags & NLM_F_EXCL)) 6194 err = 0; 6195 } else if (err == -ENOTEMPTY) { 6196 /* ENOTEMPTY reports overlapping between this element 6197 * and an existing one. 6198 */ 6199 err = -EEXIST; 6200 } 6201 goto err_element_clash; 6202 } 6203 6204 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size && 6205 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { 6206 err = -ENFILE; 6207 goto err_set_full; 6208 } 6209 6210 nft_trans_elem(trans) = elem; 6211 nft_trans_commit_list_add_tail(ctx->net, trans); 6212 return 0; 6213 6214 err_set_full: 6215 nft_setelem_remove(ctx->net, set, &elem); 6216 err_element_clash: 6217 kfree(trans); 6218 err_elem_free: 6219 if (obj) 6220 obj->use--; 6221 err_elem_userdata: 6222 nf_tables_set_elem_destroy(ctx, set, elem.priv); 6223 err_parse_data: 6224 if (nla[NFTA_SET_ELEM_DATA] != NULL) 6225 nft_data_release(&elem.data.val, desc.type); 6226 err_parse_key_end: 6227 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE); 6228 err_parse_key: 6229 nft_data_release(&elem.key.val, NFT_DATA_VALUE); 6230 err_set_elem_expr: 6231 for (i = 0; i < num_exprs && expr_array[i]; i++) 6232 nft_expr_destroy(ctx, expr_array[i]); 6233 err_set_elem_expr_clone: 6234 return err; 6235 } 6236 6237 static int nf_tables_newsetelem(struct sk_buff *skb, 6238 const struct nfnl_info *info, 6239 const struct nlattr * const nla[]) 6240 { 6241 struct nftables_pernet *nft_net = nft_pernet(info->net); 6242 struct netlink_ext_ack *extack = info->extack; 6243 u8 genmask = nft_genmask_next(info->net); 6244 u8 family = info->nfmsg->nfgen_family; 6245 struct net *net = info->net; 6246 const struct nlattr *attr; 6247 struct nft_table *table; 6248 struct nft_set *set; 6249 struct nft_ctx ctx; 6250 int rem, err; 6251 6252 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) 6253 return -EINVAL; 6254 6255 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 6256 genmask, NETLINK_CB(skb).portid); 6257 if (IS_ERR(table)) { 6258 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 6259 return PTR_ERR(table); 6260 } 6261 6262 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET], 6263 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask); 6264 if (IS_ERR(set)) 6265 return PTR_ERR(set); 6266 6267 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) 6268 return -EBUSY; 6269 6270 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6271 6272 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 6273 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags); 6274 if (err < 0) { 6275 NL_SET_BAD_ATTR(extack, attr); 6276 return err; 6277 } 6278 } 6279 6280 if (nft_net->validate_state == NFT_VALIDATE_DO) 6281 return nft_table_validate(net, table); 6282 6283 return 0; 6284 } 6285 6286 /** 6287 * nft_data_hold - hold a nft_data item 6288 * 6289 * @data: struct nft_data to release 6290 * @type: type of data 6291 * 6292 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, 6293 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and 6294 * NFT_GOTO verdicts. This function must be called on active data objects 6295 * from the second phase of the commit protocol. 6296 */ 6297 void nft_data_hold(const struct nft_data *data, enum nft_data_types type) 6298 { 6299 struct nft_chain *chain; 6300 struct nft_rule *rule; 6301 6302 if (type == NFT_DATA_VERDICT) { 6303 switch (data->verdict.code) { 6304 case NFT_JUMP: 6305 case NFT_GOTO: 6306 chain = data->verdict.chain; 6307 chain->use++; 6308 6309 if (!nft_chain_is_bound(chain)) 6310 break; 6311 6312 chain->table->use++; 6313 list_for_each_entry(rule, &chain->rules, list) 6314 chain->use++; 6315 6316 nft_chain_add(chain->table, chain); 6317 break; 6318 } 6319 } 6320 } 6321 6322 static void nft_setelem_data_activate(const struct net *net, 6323 const struct nft_set *set, 6324 struct nft_set_elem *elem) 6325 { 6326 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 6327 6328 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 6329 nft_data_hold(nft_set_ext_data(ext), set->dtype); 6330 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 6331 (*nft_set_ext_obj(ext))->use++; 6332 } 6333 6334 static void nft_setelem_data_deactivate(const struct net *net, 6335 const struct nft_set *set, 6336 struct nft_set_elem *elem) 6337 { 6338 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 6339 6340 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 6341 nft_data_release(nft_set_ext_data(ext), set->dtype); 6342 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 6343 (*nft_set_ext_obj(ext))->use--; 6344 } 6345 6346 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, 6347 const struct nlattr *attr) 6348 { 6349 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 6350 struct nft_set_ext_tmpl tmpl; 6351 struct nft_set_elem elem; 6352 struct nft_set_ext *ext; 6353 struct nft_trans *trans; 6354 u32 flags = 0; 6355 int err; 6356 6357 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 6358 nft_set_elem_policy, NULL); 6359 if (err < 0) 6360 return err; 6361 6362 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 6363 if (err < 0) 6364 return err; 6365 6366 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 6367 return -EINVAL; 6368 6369 if (!nft_setelem_valid_key_end(set, nla, flags)) 6370 return -EINVAL; 6371 6372 nft_set_ext_prepare(&tmpl); 6373 6374 if (flags != 0) { 6375 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); 6376 if (err < 0) 6377 return err; 6378 } 6379 6380 if (nla[NFTA_SET_ELEM_KEY]) { 6381 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 6382 nla[NFTA_SET_ELEM_KEY]); 6383 if (err < 0) 6384 return err; 6385 6386 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen); 6387 if (err < 0) 6388 goto fail_elem; 6389 } 6390 6391 if (nla[NFTA_SET_ELEM_KEY_END]) { 6392 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 6393 nla[NFTA_SET_ELEM_KEY_END]); 6394 if (err < 0) 6395 goto fail_elem; 6396 6397 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen); 6398 if (err < 0) 6399 goto fail_elem_key_end; 6400 } 6401 6402 err = -ENOMEM; 6403 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, 6404 elem.key_end.val.data, NULL, 0, 0, 6405 GFP_KERNEL_ACCOUNT); 6406 if (IS_ERR(elem.priv)) { 6407 err = PTR_ERR(elem.priv); 6408 goto fail_elem_key_end; 6409 } 6410 6411 ext = nft_set_elem_ext(set, elem.priv); 6412 if (flags) 6413 *nft_set_ext_flags(ext) = flags; 6414 6415 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); 6416 if (trans == NULL) 6417 goto fail_trans; 6418 6419 err = nft_setelem_deactivate(ctx->net, set, &elem, flags); 6420 if (err < 0) 6421 goto fail_ops; 6422 6423 nft_setelem_data_deactivate(ctx->net, set, &elem); 6424 6425 nft_trans_elem(trans) = elem; 6426 nft_trans_commit_list_add_tail(ctx->net, trans); 6427 return 0; 6428 6429 fail_ops: 6430 kfree(trans); 6431 fail_trans: 6432 kfree(elem.priv); 6433 fail_elem_key_end: 6434 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE); 6435 fail_elem: 6436 nft_data_release(&elem.key.val, NFT_DATA_VALUE); 6437 return err; 6438 } 6439 6440 static int nft_setelem_flush(const struct nft_ctx *ctx, 6441 struct nft_set *set, 6442 const struct nft_set_iter *iter, 6443 struct nft_set_elem *elem) 6444 { 6445 struct nft_trans *trans; 6446 int err; 6447 6448 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, 6449 sizeof(struct nft_trans_elem), GFP_ATOMIC); 6450 if (!trans) 6451 return -ENOMEM; 6452 6453 if (!set->ops->flush(ctx->net, set, elem->priv)) { 6454 err = -ENOENT; 6455 goto err1; 6456 } 6457 set->ndeact++; 6458 6459 nft_setelem_data_deactivate(ctx->net, set, elem); 6460 nft_trans_elem_set(trans) = set; 6461 nft_trans_elem(trans) = *elem; 6462 nft_trans_commit_list_add_tail(ctx->net, trans); 6463 6464 return 0; 6465 err1: 6466 kfree(trans); 6467 return err; 6468 } 6469 6470 static int __nft_set_catchall_flush(const struct nft_ctx *ctx, 6471 struct nft_set *set, 6472 struct nft_set_elem *elem) 6473 { 6474 struct nft_trans *trans; 6475 6476 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, 6477 sizeof(struct nft_trans_elem), GFP_KERNEL); 6478 if (!trans) 6479 return -ENOMEM; 6480 6481 nft_setelem_data_deactivate(ctx->net, set, elem); 6482 nft_trans_elem_set(trans) = set; 6483 nft_trans_elem(trans) = *elem; 6484 nft_trans_commit_list_add_tail(ctx->net, trans); 6485 6486 return 0; 6487 } 6488 6489 static int nft_set_catchall_flush(const struct nft_ctx *ctx, 6490 struct nft_set *set) 6491 { 6492 u8 genmask = nft_genmask_next(ctx->net); 6493 struct nft_set_elem_catchall *catchall; 6494 struct nft_set_elem elem; 6495 struct nft_set_ext *ext; 6496 int ret = 0; 6497 6498 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 6499 ext = nft_set_elem_ext(set, catchall->elem); 6500 if (!nft_set_elem_active(ext, genmask) || 6501 nft_set_elem_mark_busy(ext)) 6502 continue; 6503 6504 elem.priv = catchall->elem; 6505 ret = __nft_set_catchall_flush(ctx, set, &elem); 6506 if (ret < 0) 6507 break; 6508 } 6509 6510 return ret; 6511 } 6512 6513 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask) 6514 { 6515 struct nft_set_iter iter = { 6516 .genmask = genmask, 6517 .fn = nft_setelem_flush, 6518 }; 6519 6520 set->ops->walk(ctx, set, &iter); 6521 if (!iter.err) 6522 iter.err = nft_set_catchall_flush(ctx, set); 6523 6524 return iter.err; 6525 } 6526 6527 static int nf_tables_delsetelem(struct sk_buff *skb, 6528 const struct nfnl_info *info, 6529 const struct nlattr * const nla[]) 6530 { 6531 struct netlink_ext_ack *extack = info->extack; 6532 u8 genmask = nft_genmask_next(info->net); 6533 u8 family = info->nfmsg->nfgen_family; 6534 struct net *net = info->net; 6535 const struct nlattr *attr; 6536 struct nft_table *table; 6537 struct nft_set *set; 6538 struct nft_ctx ctx; 6539 int rem, err = 0; 6540 6541 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 6542 genmask, NETLINK_CB(skb).portid); 6543 if (IS_ERR(table)) { 6544 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 6545 return PTR_ERR(table); 6546 } 6547 6548 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask); 6549 if (IS_ERR(set)) 6550 return PTR_ERR(set); 6551 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) 6552 return -EBUSY; 6553 6554 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6555 6556 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) 6557 return nft_set_flush(&ctx, set, genmask); 6558 6559 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 6560 err = nft_del_setelem(&ctx, set, attr); 6561 if (err < 0) { 6562 NL_SET_BAD_ATTR(extack, attr); 6563 break; 6564 } 6565 } 6566 return err; 6567 } 6568 6569 void nft_set_gc_batch_release(struct rcu_head *rcu) 6570 { 6571 struct nft_set_gc_batch *gcb; 6572 unsigned int i; 6573 6574 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); 6575 for (i = 0; i < gcb->head.cnt; i++) 6576 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); 6577 kfree(gcb); 6578 } 6579 6580 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, 6581 gfp_t gfp) 6582 { 6583 struct nft_set_gc_batch *gcb; 6584 6585 gcb = kzalloc(sizeof(*gcb), gfp); 6586 if (gcb == NULL) 6587 return gcb; 6588 gcb->head.set = set; 6589 return gcb; 6590 } 6591 6592 /* 6593 * Stateful objects 6594 */ 6595 6596 /** 6597 * nft_register_obj- register nf_tables stateful object type 6598 * @obj_type: object type 6599 * 6600 * Registers the object type for use with nf_tables. Returns zero on 6601 * success or a negative errno code otherwise. 6602 */ 6603 int nft_register_obj(struct nft_object_type *obj_type) 6604 { 6605 if (obj_type->type == NFT_OBJECT_UNSPEC) 6606 return -EINVAL; 6607 6608 nfnl_lock(NFNL_SUBSYS_NFTABLES); 6609 list_add_rcu(&obj_type->list, &nf_tables_objects); 6610 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 6611 return 0; 6612 } 6613 EXPORT_SYMBOL_GPL(nft_register_obj); 6614 6615 /** 6616 * nft_unregister_obj - unregister nf_tables object type 6617 * @obj_type: object type 6618 * 6619 * Unregisters the object type for use with nf_tables. 6620 */ 6621 void nft_unregister_obj(struct nft_object_type *obj_type) 6622 { 6623 nfnl_lock(NFNL_SUBSYS_NFTABLES); 6624 list_del_rcu(&obj_type->list); 6625 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 6626 } 6627 EXPORT_SYMBOL_GPL(nft_unregister_obj); 6628 6629 struct nft_object *nft_obj_lookup(const struct net *net, 6630 const struct nft_table *table, 6631 const struct nlattr *nla, u32 objtype, 6632 u8 genmask) 6633 { 6634 struct nft_object_hash_key k = { .table = table }; 6635 char search[NFT_OBJ_MAXNAMELEN]; 6636 struct rhlist_head *tmp, *list; 6637 struct nft_object *obj; 6638 6639 nla_strscpy(search, nla, sizeof(search)); 6640 k.name = search; 6641 6642 WARN_ON_ONCE(!rcu_read_lock_held() && 6643 !lockdep_commit_lock_is_held(net)); 6644 6645 rcu_read_lock(); 6646 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params); 6647 if (!list) 6648 goto out; 6649 6650 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) { 6651 if (objtype == obj->ops->type->type && 6652 nft_active_genmask(obj, genmask)) { 6653 rcu_read_unlock(); 6654 return obj; 6655 } 6656 } 6657 out: 6658 rcu_read_unlock(); 6659 return ERR_PTR(-ENOENT); 6660 } 6661 EXPORT_SYMBOL_GPL(nft_obj_lookup); 6662 6663 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table, 6664 const struct nlattr *nla, 6665 u32 objtype, u8 genmask) 6666 { 6667 struct nft_object *obj; 6668 6669 list_for_each_entry(obj, &table->objects, list) { 6670 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle && 6671 objtype == obj->ops->type->type && 6672 nft_active_genmask(obj, genmask)) 6673 return obj; 6674 } 6675 return ERR_PTR(-ENOENT); 6676 } 6677 6678 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { 6679 [NFTA_OBJ_TABLE] = { .type = NLA_STRING, 6680 .len = NFT_TABLE_MAXNAMELEN - 1 }, 6681 [NFTA_OBJ_NAME] = { .type = NLA_STRING, 6682 .len = NFT_OBJ_MAXNAMELEN - 1 }, 6683 [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, 6684 [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, 6685 [NFTA_OBJ_HANDLE] = { .type = NLA_U64}, 6686 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY, 6687 .len = NFT_USERDATA_MAXLEN }, 6688 }; 6689 6690 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, 6691 const struct nft_object_type *type, 6692 const struct nlattr *attr) 6693 { 6694 struct nlattr **tb; 6695 const struct nft_object_ops *ops; 6696 struct nft_object *obj; 6697 int err = -ENOMEM; 6698 6699 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL); 6700 if (!tb) 6701 goto err1; 6702 6703 if (attr) { 6704 err = nla_parse_nested_deprecated(tb, type->maxattr, attr, 6705 type->policy, NULL); 6706 if (err < 0) 6707 goto err2; 6708 } else { 6709 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); 6710 } 6711 6712 if (type->select_ops) { 6713 ops = type->select_ops(ctx, (const struct nlattr * const *)tb); 6714 if (IS_ERR(ops)) { 6715 err = PTR_ERR(ops); 6716 goto err2; 6717 } 6718 } else { 6719 ops = type->ops; 6720 } 6721 6722 err = -ENOMEM; 6723 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT); 6724 if (!obj) 6725 goto err2; 6726 6727 err = ops->init(ctx, (const struct nlattr * const *)tb, obj); 6728 if (err < 0) 6729 goto err3; 6730 6731 obj->ops = ops; 6732 6733 kfree(tb); 6734 return obj; 6735 err3: 6736 kfree(obj); 6737 err2: 6738 kfree(tb); 6739 err1: 6740 return ERR_PTR(err); 6741 } 6742 6743 static int nft_object_dump(struct sk_buff *skb, unsigned int attr, 6744 struct nft_object *obj, bool reset) 6745 { 6746 struct nlattr *nest; 6747 6748 nest = nla_nest_start_noflag(skb, attr); 6749 if (!nest) 6750 goto nla_put_failure; 6751 if (obj->ops->dump(skb, obj, reset) < 0) 6752 goto nla_put_failure; 6753 nla_nest_end(skb, nest); 6754 return 0; 6755 6756 nla_put_failure: 6757 return -1; 6758 } 6759 6760 static const struct nft_object_type *__nft_obj_type_get(u32 objtype) 6761 { 6762 const struct nft_object_type *type; 6763 6764 list_for_each_entry(type, &nf_tables_objects, list) { 6765 if (objtype == type->type) 6766 return type; 6767 } 6768 return NULL; 6769 } 6770 6771 static const struct nft_object_type * 6772 nft_obj_type_get(struct net *net, u32 objtype) 6773 { 6774 const struct nft_object_type *type; 6775 6776 type = __nft_obj_type_get(objtype); 6777 if (type != NULL && try_module_get(type->owner)) 6778 return type; 6779 6780 lockdep_nfnl_nft_mutex_not_held(); 6781 #ifdef CONFIG_MODULES 6782 if (type == NULL) { 6783 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN) 6784 return ERR_PTR(-EAGAIN); 6785 } 6786 #endif 6787 return ERR_PTR(-ENOENT); 6788 } 6789 6790 static int nf_tables_updobj(const struct nft_ctx *ctx, 6791 const struct nft_object_type *type, 6792 const struct nlattr *attr, 6793 struct nft_object *obj) 6794 { 6795 struct nft_object *newobj; 6796 struct nft_trans *trans; 6797 int err = -ENOMEM; 6798 6799 if (!try_module_get(type->owner)) 6800 return -ENOENT; 6801 6802 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ, 6803 sizeof(struct nft_trans_obj)); 6804 if (!trans) 6805 goto err_trans; 6806 6807 newobj = nft_obj_init(ctx, type, attr); 6808 if (IS_ERR(newobj)) { 6809 err = PTR_ERR(newobj); 6810 goto err_free_trans; 6811 } 6812 6813 nft_trans_obj(trans) = obj; 6814 nft_trans_obj_update(trans) = true; 6815 nft_trans_obj_newobj(trans) = newobj; 6816 nft_trans_commit_list_add_tail(ctx->net, trans); 6817 6818 return 0; 6819 6820 err_free_trans: 6821 kfree(trans); 6822 err_trans: 6823 module_put(type->owner); 6824 return err; 6825 } 6826 6827 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info, 6828 const struct nlattr * const nla[]) 6829 { 6830 struct netlink_ext_ack *extack = info->extack; 6831 u8 genmask = nft_genmask_next(info->net); 6832 u8 family = info->nfmsg->nfgen_family; 6833 const struct nft_object_type *type; 6834 struct net *net = info->net; 6835 struct nft_table *table; 6836 struct nft_object *obj; 6837 struct nft_ctx ctx; 6838 u32 objtype; 6839 int err; 6840 6841 if (!nla[NFTA_OBJ_TYPE] || 6842 !nla[NFTA_OBJ_NAME] || 6843 !nla[NFTA_OBJ_DATA]) 6844 return -EINVAL; 6845 6846 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 6847 NETLINK_CB(skb).portid); 6848 if (IS_ERR(table)) { 6849 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 6850 return PTR_ERR(table); 6851 } 6852 6853 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 6854 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask); 6855 if (IS_ERR(obj)) { 6856 err = PTR_ERR(obj); 6857 if (err != -ENOENT) { 6858 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 6859 return err; 6860 } 6861 } else { 6862 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 6863 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 6864 return -EEXIST; 6865 } 6866 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 6867 return -EOPNOTSUPP; 6868 6869 type = __nft_obj_type_get(objtype); 6870 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6871 6872 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj); 6873 } 6874 6875 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6876 6877 type = nft_obj_type_get(net, objtype); 6878 if (IS_ERR(type)) 6879 return PTR_ERR(type); 6880 6881 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); 6882 if (IS_ERR(obj)) { 6883 err = PTR_ERR(obj); 6884 goto err_init; 6885 } 6886 obj->key.table = table; 6887 obj->handle = nf_tables_alloc_handle(table); 6888 6889 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT); 6890 if (!obj->key.name) { 6891 err = -ENOMEM; 6892 goto err_strdup; 6893 } 6894 6895 if (nla[NFTA_OBJ_USERDATA]) { 6896 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL); 6897 if (obj->udata == NULL) 6898 goto err_userdata; 6899 6900 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]); 6901 } 6902 6903 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); 6904 if (err < 0) 6905 goto err_trans; 6906 6907 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead, 6908 nft_objname_ht_params); 6909 if (err < 0) 6910 goto err_obj_ht; 6911 6912 list_add_tail_rcu(&obj->list, &table->objects); 6913 table->use++; 6914 return 0; 6915 err_obj_ht: 6916 /* queued in transaction log */ 6917 INIT_LIST_HEAD(&obj->list); 6918 return err; 6919 err_trans: 6920 kfree(obj->udata); 6921 err_userdata: 6922 kfree(obj->key.name); 6923 err_strdup: 6924 if (obj->ops->destroy) 6925 obj->ops->destroy(&ctx, obj); 6926 kfree(obj); 6927 err_init: 6928 module_put(type->owner); 6929 return err; 6930 } 6931 6932 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, 6933 u32 portid, u32 seq, int event, u32 flags, 6934 int family, const struct nft_table *table, 6935 struct nft_object *obj, bool reset) 6936 { 6937 struct nlmsghdr *nlh; 6938 6939 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 6940 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 6941 NFNETLINK_V0, nft_base_seq(net)); 6942 if (!nlh) 6943 goto nla_put_failure; 6944 6945 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || 6946 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) || 6947 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) || 6948 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || 6949 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) || 6950 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle), 6951 NFTA_OBJ_PAD)) 6952 goto nla_put_failure; 6953 6954 if (obj->udata && 6955 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata)) 6956 goto nla_put_failure; 6957 6958 nlmsg_end(skb, nlh); 6959 return 0; 6960 6961 nla_put_failure: 6962 nlmsg_trim(skb, nlh); 6963 return -1; 6964 } 6965 6966 struct nft_obj_filter { 6967 char *table; 6968 u32 type; 6969 }; 6970 6971 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) 6972 { 6973 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 6974 const struct nft_table *table; 6975 unsigned int idx = 0, s_idx = cb->args[0]; 6976 struct nft_obj_filter *filter = cb->data; 6977 struct net *net = sock_net(skb->sk); 6978 int family = nfmsg->nfgen_family; 6979 struct nftables_pernet *nft_net; 6980 struct nft_object *obj; 6981 bool reset = false; 6982 6983 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) 6984 reset = true; 6985 6986 rcu_read_lock(); 6987 nft_net = nft_pernet(net); 6988 cb->seq = READ_ONCE(nft_net->base_seq); 6989 6990 list_for_each_entry_rcu(table, &nft_net->tables, list) { 6991 if (family != NFPROTO_UNSPEC && family != table->family) 6992 continue; 6993 6994 list_for_each_entry_rcu(obj, &table->objects, list) { 6995 if (!nft_is_active(net, obj)) 6996 goto cont; 6997 if (idx < s_idx) 6998 goto cont; 6999 if (idx > s_idx) 7000 memset(&cb->args[1], 0, 7001 sizeof(cb->args) - sizeof(cb->args[0])); 7002 if (filter && filter->table && 7003 strcmp(filter->table, table->name)) 7004 goto cont; 7005 if (filter && 7006 filter->type != NFT_OBJECT_UNSPEC && 7007 obj->ops->type->type != filter->type) 7008 goto cont; 7009 if (reset) { 7010 char *buf = kasprintf(GFP_ATOMIC, 7011 "%s:%u", 7012 table->name, 7013 nft_net->base_seq); 7014 7015 audit_log_nfcfg(buf, 7016 family, 7017 obj->handle, 7018 AUDIT_NFT_OP_OBJ_RESET, 7019 GFP_ATOMIC); 7020 kfree(buf); 7021 } 7022 7023 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, 7024 cb->nlh->nlmsg_seq, 7025 NFT_MSG_NEWOBJ, 7026 NLM_F_MULTI | NLM_F_APPEND, 7027 table->family, table, 7028 obj, reset) < 0) 7029 goto done; 7030 7031 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 7032 cont: 7033 idx++; 7034 } 7035 } 7036 done: 7037 rcu_read_unlock(); 7038 7039 cb->args[0] = idx; 7040 return skb->len; 7041 } 7042 7043 static int nf_tables_dump_obj_start(struct netlink_callback *cb) 7044 { 7045 const struct nlattr * const *nla = cb->data; 7046 struct nft_obj_filter *filter = NULL; 7047 7048 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) { 7049 filter = kzalloc(sizeof(*filter), GFP_ATOMIC); 7050 if (!filter) 7051 return -ENOMEM; 7052 7053 if (nla[NFTA_OBJ_TABLE]) { 7054 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC); 7055 if (!filter->table) { 7056 kfree(filter); 7057 return -ENOMEM; 7058 } 7059 } 7060 7061 if (nla[NFTA_OBJ_TYPE]) 7062 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 7063 } 7064 7065 cb->data = filter; 7066 return 0; 7067 } 7068 7069 static int nf_tables_dump_obj_done(struct netlink_callback *cb) 7070 { 7071 struct nft_obj_filter *filter = cb->data; 7072 7073 if (filter) { 7074 kfree(filter->table); 7075 kfree(filter); 7076 } 7077 7078 return 0; 7079 } 7080 7081 /* called with rcu_read_lock held */ 7082 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info, 7083 const struct nlattr * const nla[]) 7084 { 7085 struct netlink_ext_ack *extack = info->extack; 7086 u8 genmask = nft_genmask_cur(info->net); 7087 u8 family = info->nfmsg->nfgen_family; 7088 const struct nft_table *table; 7089 struct net *net = info->net; 7090 struct nft_object *obj; 7091 struct sk_buff *skb2; 7092 bool reset = false; 7093 u32 objtype; 7094 int err; 7095 7096 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 7097 struct netlink_dump_control c = { 7098 .start = nf_tables_dump_obj_start, 7099 .dump = nf_tables_dump_obj, 7100 .done = nf_tables_dump_obj_done, 7101 .module = THIS_MODULE, 7102 .data = (void *)nla, 7103 }; 7104 7105 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 7106 } 7107 7108 if (!nla[NFTA_OBJ_NAME] || 7109 !nla[NFTA_OBJ_TYPE]) 7110 return -EINVAL; 7111 7112 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0); 7113 if (IS_ERR(table)) { 7114 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 7115 return PTR_ERR(table); 7116 } 7117 7118 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 7119 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask); 7120 if (IS_ERR(obj)) { 7121 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 7122 return PTR_ERR(obj); 7123 } 7124 7125 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 7126 if (!skb2) 7127 return -ENOMEM; 7128 7129 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) 7130 reset = true; 7131 7132 if (reset) { 7133 const struct nftables_pernet *nft_net; 7134 char *buf; 7135 7136 nft_net = nft_pernet(net); 7137 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq); 7138 7139 audit_log_nfcfg(buf, 7140 family, 7141 obj->handle, 7142 AUDIT_NFT_OP_OBJ_RESET, 7143 GFP_ATOMIC); 7144 kfree(buf); 7145 } 7146 7147 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, 7148 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, 7149 family, table, obj, reset); 7150 if (err < 0) 7151 goto err_fill_obj_info; 7152 7153 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 7154 7155 err_fill_obj_info: 7156 kfree_skb(skb2); 7157 return err; 7158 } 7159 7160 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj) 7161 { 7162 if (obj->ops->destroy) 7163 obj->ops->destroy(ctx, obj); 7164 7165 module_put(obj->ops->type->owner); 7166 kfree(obj->key.name); 7167 kfree(obj->udata); 7168 kfree(obj); 7169 } 7170 7171 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info, 7172 const struct nlattr * const nla[]) 7173 { 7174 struct netlink_ext_ack *extack = info->extack; 7175 u8 genmask = nft_genmask_next(info->net); 7176 u8 family = info->nfmsg->nfgen_family; 7177 struct net *net = info->net; 7178 const struct nlattr *attr; 7179 struct nft_table *table; 7180 struct nft_object *obj; 7181 struct nft_ctx ctx; 7182 u32 objtype; 7183 7184 if (!nla[NFTA_OBJ_TYPE] || 7185 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE])) 7186 return -EINVAL; 7187 7188 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 7189 NETLINK_CB(skb).portid); 7190 if (IS_ERR(table)) { 7191 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 7192 return PTR_ERR(table); 7193 } 7194 7195 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 7196 if (nla[NFTA_OBJ_HANDLE]) { 7197 attr = nla[NFTA_OBJ_HANDLE]; 7198 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask); 7199 } else { 7200 attr = nla[NFTA_OBJ_NAME]; 7201 obj = nft_obj_lookup(net, table, attr, objtype, genmask); 7202 } 7203 7204 if (IS_ERR(obj)) { 7205 NL_SET_BAD_ATTR(extack, attr); 7206 return PTR_ERR(obj); 7207 } 7208 if (obj->use > 0) { 7209 NL_SET_BAD_ATTR(extack, attr); 7210 return -EBUSY; 7211 } 7212 7213 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7214 7215 return nft_delobj(&ctx, obj); 7216 } 7217 7218 void nft_obj_notify(struct net *net, const struct nft_table *table, 7219 struct nft_object *obj, u32 portid, u32 seq, int event, 7220 u16 flags, int family, int report, gfp_t gfp) 7221 { 7222 struct nftables_pernet *nft_net = nft_pernet(net); 7223 struct sk_buff *skb; 7224 int err; 7225 char *buf = kasprintf(gfp, "%s:%u", 7226 table->name, nft_net->base_seq); 7227 7228 audit_log_nfcfg(buf, 7229 family, 7230 obj->handle, 7231 event == NFT_MSG_NEWOBJ ? 7232 AUDIT_NFT_OP_OBJ_REGISTER : 7233 AUDIT_NFT_OP_OBJ_UNREGISTER, 7234 gfp); 7235 kfree(buf); 7236 7237 if (!report && 7238 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 7239 return; 7240 7241 skb = nlmsg_new(NLMSG_GOODSIZE, gfp); 7242 if (skb == NULL) 7243 goto err; 7244 7245 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 7246 flags & (NLM_F_CREATE | NLM_F_EXCL), 7247 family, table, obj, false); 7248 if (err < 0) { 7249 kfree_skb(skb); 7250 goto err; 7251 } 7252 7253 nft_notify_enqueue(skb, report, &nft_net->notify_list); 7254 return; 7255 err: 7256 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 7257 } 7258 EXPORT_SYMBOL_GPL(nft_obj_notify); 7259 7260 static void nf_tables_obj_notify(const struct nft_ctx *ctx, 7261 struct nft_object *obj, int event) 7262 { 7263 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, 7264 ctx->flags, ctx->family, ctx->report, GFP_KERNEL); 7265 } 7266 7267 /* 7268 * Flow tables 7269 */ 7270 void nft_register_flowtable_type(struct nf_flowtable_type *type) 7271 { 7272 nfnl_lock(NFNL_SUBSYS_NFTABLES); 7273 list_add_tail_rcu(&type->list, &nf_tables_flowtables); 7274 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 7275 } 7276 EXPORT_SYMBOL_GPL(nft_register_flowtable_type); 7277 7278 void nft_unregister_flowtable_type(struct nf_flowtable_type *type) 7279 { 7280 nfnl_lock(NFNL_SUBSYS_NFTABLES); 7281 list_del_rcu(&type->list); 7282 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 7283 } 7284 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type); 7285 7286 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = { 7287 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING, 7288 .len = NFT_NAME_MAXLEN - 1 }, 7289 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING, 7290 .len = NFT_NAME_MAXLEN - 1 }, 7291 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED }, 7292 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 }, 7293 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 }, 7294 }; 7295 7296 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, 7297 const struct nlattr *nla, u8 genmask) 7298 { 7299 struct nft_flowtable *flowtable; 7300 7301 list_for_each_entry_rcu(flowtable, &table->flowtables, list) { 7302 if (!nla_strcmp(nla, flowtable->name) && 7303 nft_active_genmask(flowtable, genmask)) 7304 return flowtable; 7305 } 7306 return ERR_PTR(-ENOENT); 7307 } 7308 EXPORT_SYMBOL_GPL(nft_flowtable_lookup); 7309 7310 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, 7311 struct nft_flowtable *flowtable, 7312 enum nft_trans_phase phase) 7313 { 7314 switch (phase) { 7315 case NFT_TRANS_PREPARE: 7316 case NFT_TRANS_ABORT: 7317 case NFT_TRANS_RELEASE: 7318 flowtable->use--; 7319 fallthrough; 7320 default: 7321 return; 7322 } 7323 } 7324 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable); 7325 7326 static struct nft_flowtable * 7327 nft_flowtable_lookup_byhandle(const struct nft_table *table, 7328 const struct nlattr *nla, u8 genmask) 7329 { 7330 struct nft_flowtable *flowtable; 7331 7332 list_for_each_entry(flowtable, &table->flowtables, list) { 7333 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle && 7334 nft_active_genmask(flowtable, genmask)) 7335 return flowtable; 7336 } 7337 return ERR_PTR(-ENOENT); 7338 } 7339 7340 struct nft_flowtable_hook { 7341 u32 num; 7342 int priority; 7343 struct list_head list; 7344 }; 7345 7346 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = { 7347 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 }, 7348 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 }, 7349 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED }, 7350 }; 7351 7352 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx, 7353 const struct nlattr *attr, 7354 struct nft_flowtable_hook *flowtable_hook, 7355 struct nft_flowtable *flowtable, bool add) 7356 { 7357 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1]; 7358 struct nft_hook *hook; 7359 int hooknum, priority; 7360 int err; 7361 7362 INIT_LIST_HEAD(&flowtable_hook->list); 7363 7364 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr, 7365 nft_flowtable_hook_policy, NULL); 7366 if (err < 0) 7367 return err; 7368 7369 if (add) { 7370 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] || 7371 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) 7372 return -EINVAL; 7373 7374 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); 7375 if (hooknum != NF_NETDEV_INGRESS) 7376 return -EOPNOTSUPP; 7377 7378 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); 7379 7380 flowtable_hook->priority = priority; 7381 flowtable_hook->num = hooknum; 7382 } else { 7383 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) { 7384 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); 7385 if (hooknum != flowtable->hooknum) 7386 return -EOPNOTSUPP; 7387 } 7388 7389 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) { 7390 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); 7391 if (priority != flowtable->data.priority) 7392 return -EOPNOTSUPP; 7393 } 7394 7395 flowtable_hook->priority = flowtable->data.priority; 7396 flowtable_hook->num = flowtable->hooknum; 7397 } 7398 7399 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) { 7400 err = nf_tables_parse_netdev_hooks(ctx->net, 7401 tb[NFTA_FLOWTABLE_HOOK_DEVS], 7402 &flowtable_hook->list); 7403 if (err < 0) 7404 return err; 7405 } 7406 7407 list_for_each_entry(hook, &flowtable_hook->list, list) { 7408 hook->ops.pf = NFPROTO_NETDEV; 7409 hook->ops.hooknum = flowtable_hook->num; 7410 hook->ops.priority = flowtable_hook->priority; 7411 hook->ops.priv = &flowtable->data; 7412 hook->ops.hook = flowtable->data.type->hook; 7413 } 7414 7415 return err; 7416 } 7417 7418 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family) 7419 { 7420 const struct nf_flowtable_type *type; 7421 7422 list_for_each_entry(type, &nf_tables_flowtables, list) { 7423 if (family == type->family) 7424 return type; 7425 } 7426 return NULL; 7427 } 7428 7429 static const struct nf_flowtable_type * 7430 nft_flowtable_type_get(struct net *net, u8 family) 7431 { 7432 const struct nf_flowtable_type *type; 7433 7434 type = __nft_flowtable_type_get(family); 7435 if (type != NULL && try_module_get(type->owner)) 7436 return type; 7437 7438 lockdep_nfnl_nft_mutex_not_held(); 7439 #ifdef CONFIG_MODULES 7440 if (type == NULL) { 7441 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN) 7442 return ERR_PTR(-EAGAIN); 7443 } 7444 #endif 7445 return ERR_PTR(-ENOENT); 7446 } 7447 7448 /* Only called from error and netdev event paths. */ 7449 static void nft_unregister_flowtable_hook(struct net *net, 7450 struct nft_flowtable *flowtable, 7451 struct nft_hook *hook) 7452 { 7453 nf_unregister_net_hook(net, &hook->ops); 7454 flowtable->data.type->setup(&flowtable->data, hook->ops.dev, 7455 FLOW_BLOCK_UNBIND); 7456 } 7457 7458 static void __nft_unregister_flowtable_net_hooks(struct net *net, 7459 struct list_head *hook_list, 7460 bool release_netdev) 7461 { 7462 struct nft_hook *hook, *next; 7463 7464 list_for_each_entry_safe(hook, next, hook_list, list) { 7465 nf_unregister_net_hook(net, &hook->ops); 7466 if (release_netdev) { 7467 list_del(&hook->list); 7468 kfree_rcu(hook, rcu); 7469 } 7470 } 7471 } 7472 7473 static void nft_unregister_flowtable_net_hooks(struct net *net, 7474 struct list_head *hook_list) 7475 { 7476 __nft_unregister_flowtable_net_hooks(net, hook_list, false); 7477 } 7478 7479 static int nft_register_flowtable_net_hooks(struct net *net, 7480 struct nft_table *table, 7481 struct list_head *hook_list, 7482 struct nft_flowtable *flowtable) 7483 { 7484 struct nft_hook *hook, *hook2, *next; 7485 struct nft_flowtable *ft; 7486 int err, i = 0; 7487 7488 list_for_each_entry(hook, hook_list, list) { 7489 list_for_each_entry(ft, &table->flowtables, list) { 7490 if (!nft_is_active_next(net, ft)) 7491 continue; 7492 7493 list_for_each_entry(hook2, &ft->hook_list, list) { 7494 if (hook->ops.dev == hook2->ops.dev && 7495 hook->ops.pf == hook2->ops.pf) { 7496 err = -EEXIST; 7497 goto err_unregister_net_hooks; 7498 } 7499 } 7500 } 7501 7502 err = flowtable->data.type->setup(&flowtable->data, 7503 hook->ops.dev, 7504 FLOW_BLOCK_BIND); 7505 if (err < 0) 7506 goto err_unregister_net_hooks; 7507 7508 err = nf_register_net_hook(net, &hook->ops); 7509 if (err < 0) { 7510 flowtable->data.type->setup(&flowtable->data, 7511 hook->ops.dev, 7512 FLOW_BLOCK_UNBIND); 7513 goto err_unregister_net_hooks; 7514 } 7515 7516 i++; 7517 } 7518 7519 return 0; 7520 7521 err_unregister_net_hooks: 7522 list_for_each_entry_safe(hook, next, hook_list, list) { 7523 if (i-- <= 0) 7524 break; 7525 7526 nft_unregister_flowtable_hook(net, flowtable, hook); 7527 list_del_rcu(&hook->list); 7528 kfree_rcu(hook, rcu); 7529 } 7530 7531 return err; 7532 } 7533 7534 static void nft_flowtable_hooks_destroy(struct list_head *hook_list) 7535 { 7536 struct nft_hook *hook, *next; 7537 7538 list_for_each_entry_safe(hook, next, hook_list, list) { 7539 list_del_rcu(&hook->list); 7540 kfree_rcu(hook, rcu); 7541 } 7542 } 7543 7544 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh, 7545 struct nft_flowtable *flowtable) 7546 { 7547 const struct nlattr * const *nla = ctx->nla; 7548 struct nft_flowtable_hook flowtable_hook; 7549 struct nft_hook *hook, *next; 7550 struct nft_trans *trans; 7551 bool unregister = false; 7552 u32 flags; 7553 int err; 7554 7555 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK], 7556 &flowtable_hook, flowtable, false); 7557 if (err < 0) 7558 return err; 7559 7560 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) { 7561 if (nft_hook_list_find(&flowtable->hook_list, hook)) { 7562 list_del(&hook->list); 7563 kfree(hook); 7564 } 7565 } 7566 7567 if (nla[NFTA_FLOWTABLE_FLAGS]) { 7568 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS])); 7569 if (flags & ~NFT_FLOWTABLE_MASK) { 7570 err = -EOPNOTSUPP; 7571 goto err_flowtable_update_hook; 7572 } 7573 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^ 7574 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) { 7575 err = -EOPNOTSUPP; 7576 goto err_flowtable_update_hook; 7577 } 7578 } else { 7579 flags = flowtable->data.flags; 7580 } 7581 7582 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table, 7583 &flowtable_hook.list, flowtable); 7584 if (err < 0) 7585 goto err_flowtable_update_hook; 7586 7587 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE, 7588 sizeof(struct nft_trans_flowtable)); 7589 if (!trans) { 7590 unregister = true; 7591 err = -ENOMEM; 7592 goto err_flowtable_update_hook; 7593 } 7594 7595 nft_trans_flowtable_flags(trans) = flags; 7596 nft_trans_flowtable(trans) = flowtable; 7597 nft_trans_flowtable_update(trans) = true; 7598 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans)); 7599 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans)); 7600 7601 nft_trans_commit_list_add_tail(ctx->net, trans); 7602 7603 return 0; 7604 7605 err_flowtable_update_hook: 7606 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) { 7607 if (unregister) 7608 nft_unregister_flowtable_hook(ctx->net, flowtable, hook); 7609 list_del_rcu(&hook->list); 7610 kfree_rcu(hook, rcu); 7611 } 7612 7613 return err; 7614 7615 } 7616 7617 static int nf_tables_newflowtable(struct sk_buff *skb, 7618 const struct nfnl_info *info, 7619 const struct nlattr * const nla[]) 7620 { 7621 struct netlink_ext_ack *extack = info->extack; 7622 struct nft_flowtable_hook flowtable_hook; 7623 u8 genmask = nft_genmask_next(info->net); 7624 u8 family = info->nfmsg->nfgen_family; 7625 const struct nf_flowtable_type *type; 7626 struct nft_flowtable *flowtable; 7627 struct nft_hook *hook, *next; 7628 struct net *net = info->net; 7629 struct nft_table *table; 7630 struct nft_ctx ctx; 7631 int err; 7632 7633 if (!nla[NFTA_FLOWTABLE_TABLE] || 7634 !nla[NFTA_FLOWTABLE_NAME] || 7635 !nla[NFTA_FLOWTABLE_HOOK]) 7636 return -EINVAL; 7637 7638 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 7639 genmask, NETLINK_CB(skb).portid); 7640 if (IS_ERR(table)) { 7641 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); 7642 return PTR_ERR(table); 7643 } 7644 7645 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], 7646 genmask); 7647 if (IS_ERR(flowtable)) { 7648 err = PTR_ERR(flowtable); 7649 if (err != -ENOENT) { 7650 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); 7651 return err; 7652 } 7653 } else { 7654 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 7655 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); 7656 return -EEXIST; 7657 } 7658 7659 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7660 7661 return nft_flowtable_update(&ctx, info->nlh, flowtable); 7662 } 7663 7664 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7665 7666 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT); 7667 if (!flowtable) 7668 return -ENOMEM; 7669 7670 flowtable->table = table; 7671 flowtable->handle = nf_tables_alloc_handle(table); 7672 INIT_LIST_HEAD(&flowtable->hook_list); 7673 7674 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT); 7675 if (!flowtable->name) { 7676 err = -ENOMEM; 7677 goto err1; 7678 } 7679 7680 type = nft_flowtable_type_get(net, family); 7681 if (IS_ERR(type)) { 7682 err = PTR_ERR(type); 7683 goto err2; 7684 } 7685 7686 if (nla[NFTA_FLOWTABLE_FLAGS]) { 7687 flowtable->data.flags = 7688 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS])); 7689 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) { 7690 err = -EOPNOTSUPP; 7691 goto err3; 7692 } 7693 } 7694 7695 write_pnet(&flowtable->data.net, net); 7696 flowtable->data.type = type; 7697 err = type->init(&flowtable->data); 7698 if (err < 0) 7699 goto err3; 7700 7701 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK], 7702 &flowtable_hook, flowtable, true); 7703 if (err < 0) 7704 goto err4; 7705 7706 list_splice(&flowtable_hook.list, &flowtable->hook_list); 7707 flowtable->data.priority = flowtable_hook.priority; 7708 flowtable->hooknum = flowtable_hook.num; 7709 7710 err = nft_register_flowtable_net_hooks(ctx.net, table, 7711 &flowtable->hook_list, 7712 flowtable); 7713 if (err < 0) { 7714 nft_flowtable_hooks_destroy(&flowtable->hook_list); 7715 goto err4; 7716 } 7717 7718 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable); 7719 if (err < 0) 7720 goto err5; 7721 7722 list_add_tail_rcu(&flowtable->list, &table->flowtables); 7723 table->use++; 7724 7725 return 0; 7726 err5: 7727 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) { 7728 nft_unregister_flowtable_hook(net, flowtable, hook); 7729 list_del_rcu(&hook->list); 7730 kfree_rcu(hook, rcu); 7731 } 7732 err4: 7733 flowtable->data.type->free(&flowtable->data); 7734 err3: 7735 module_put(type->owner); 7736 err2: 7737 kfree(flowtable->name); 7738 err1: 7739 kfree(flowtable); 7740 return err; 7741 } 7742 7743 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook) 7744 { 7745 struct nft_hook *this, *next; 7746 7747 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) { 7748 list_del(&this->list); 7749 kfree(this); 7750 } 7751 } 7752 7753 static int nft_delflowtable_hook(struct nft_ctx *ctx, 7754 struct nft_flowtable *flowtable) 7755 { 7756 const struct nlattr * const *nla = ctx->nla; 7757 struct nft_flowtable_hook flowtable_hook; 7758 LIST_HEAD(flowtable_del_list); 7759 struct nft_hook *this, *hook; 7760 struct nft_trans *trans; 7761 int err; 7762 7763 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK], 7764 &flowtable_hook, flowtable, false); 7765 if (err < 0) 7766 return err; 7767 7768 list_for_each_entry(this, &flowtable_hook.list, list) { 7769 hook = nft_hook_list_find(&flowtable->hook_list, this); 7770 if (!hook) { 7771 err = -ENOENT; 7772 goto err_flowtable_del_hook; 7773 } 7774 list_move(&hook->list, &flowtable_del_list); 7775 } 7776 7777 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE, 7778 sizeof(struct nft_trans_flowtable)); 7779 if (!trans) { 7780 err = -ENOMEM; 7781 goto err_flowtable_del_hook; 7782 } 7783 7784 nft_trans_flowtable(trans) = flowtable; 7785 nft_trans_flowtable_update(trans) = true; 7786 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans)); 7787 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans)); 7788 nft_flowtable_hook_release(&flowtable_hook); 7789 7790 nft_trans_commit_list_add_tail(ctx->net, trans); 7791 7792 return 0; 7793 7794 err_flowtable_del_hook: 7795 list_splice(&flowtable_del_list, &flowtable->hook_list); 7796 nft_flowtable_hook_release(&flowtable_hook); 7797 7798 return err; 7799 } 7800 7801 static int nf_tables_delflowtable(struct sk_buff *skb, 7802 const struct nfnl_info *info, 7803 const struct nlattr * const nla[]) 7804 { 7805 struct netlink_ext_ack *extack = info->extack; 7806 u8 genmask = nft_genmask_next(info->net); 7807 u8 family = info->nfmsg->nfgen_family; 7808 struct nft_flowtable *flowtable; 7809 struct net *net = info->net; 7810 const struct nlattr *attr; 7811 struct nft_table *table; 7812 struct nft_ctx ctx; 7813 7814 if (!nla[NFTA_FLOWTABLE_TABLE] || 7815 (!nla[NFTA_FLOWTABLE_NAME] && 7816 !nla[NFTA_FLOWTABLE_HANDLE])) 7817 return -EINVAL; 7818 7819 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 7820 genmask, NETLINK_CB(skb).portid); 7821 if (IS_ERR(table)) { 7822 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); 7823 return PTR_ERR(table); 7824 } 7825 7826 if (nla[NFTA_FLOWTABLE_HANDLE]) { 7827 attr = nla[NFTA_FLOWTABLE_HANDLE]; 7828 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask); 7829 } else { 7830 attr = nla[NFTA_FLOWTABLE_NAME]; 7831 flowtable = nft_flowtable_lookup(table, attr, genmask); 7832 } 7833 7834 if (IS_ERR(flowtable)) { 7835 NL_SET_BAD_ATTR(extack, attr); 7836 return PTR_ERR(flowtable); 7837 } 7838 7839 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7840 7841 if (nla[NFTA_FLOWTABLE_HOOK]) 7842 return nft_delflowtable_hook(&ctx, flowtable); 7843 7844 if (flowtable->use > 0) { 7845 NL_SET_BAD_ATTR(extack, attr); 7846 return -EBUSY; 7847 } 7848 7849 return nft_delflowtable(&ctx, flowtable); 7850 } 7851 7852 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net, 7853 u32 portid, u32 seq, int event, 7854 u32 flags, int family, 7855 struct nft_flowtable *flowtable, 7856 struct list_head *hook_list) 7857 { 7858 struct nlattr *nest, *nest_devs; 7859 struct nft_hook *hook; 7860 struct nlmsghdr *nlh; 7861 7862 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 7863 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 7864 NFNETLINK_V0, nft_base_seq(net)); 7865 if (!nlh) 7866 goto nla_put_failure; 7867 7868 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) || 7869 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) || 7870 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) || 7871 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle), 7872 NFTA_FLOWTABLE_PAD) || 7873 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags))) 7874 goto nla_put_failure; 7875 7876 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK); 7877 if (!nest) 7878 goto nla_put_failure; 7879 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) || 7880 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority))) 7881 goto nla_put_failure; 7882 7883 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS); 7884 if (!nest_devs) 7885 goto nla_put_failure; 7886 7887 list_for_each_entry_rcu(hook, hook_list, list) { 7888 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name)) 7889 goto nla_put_failure; 7890 } 7891 nla_nest_end(skb, nest_devs); 7892 nla_nest_end(skb, nest); 7893 7894 nlmsg_end(skb, nlh); 7895 return 0; 7896 7897 nla_put_failure: 7898 nlmsg_trim(skb, nlh); 7899 return -1; 7900 } 7901 7902 struct nft_flowtable_filter { 7903 char *table; 7904 }; 7905 7906 static int nf_tables_dump_flowtable(struct sk_buff *skb, 7907 struct netlink_callback *cb) 7908 { 7909 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 7910 struct nft_flowtable_filter *filter = cb->data; 7911 unsigned int idx = 0, s_idx = cb->args[0]; 7912 struct net *net = sock_net(skb->sk); 7913 int family = nfmsg->nfgen_family; 7914 struct nft_flowtable *flowtable; 7915 struct nftables_pernet *nft_net; 7916 const struct nft_table *table; 7917 7918 rcu_read_lock(); 7919 nft_net = nft_pernet(net); 7920 cb->seq = READ_ONCE(nft_net->base_seq); 7921 7922 list_for_each_entry_rcu(table, &nft_net->tables, list) { 7923 if (family != NFPROTO_UNSPEC && family != table->family) 7924 continue; 7925 7926 list_for_each_entry_rcu(flowtable, &table->flowtables, list) { 7927 if (!nft_is_active(net, flowtable)) 7928 goto cont; 7929 if (idx < s_idx) 7930 goto cont; 7931 if (idx > s_idx) 7932 memset(&cb->args[1], 0, 7933 sizeof(cb->args) - sizeof(cb->args[0])); 7934 if (filter && filter->table && 7935 strcmp(filter->table, table->name)) 7936 goto cont; 7937 7938 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid, 7939 cb->nlh->nlmsg_seq, 7940 NFT_MSG_NEWFLOWTABLE, 7941 NLM_F_MULTI | NLM_F_APPEND, 7942 table->family, 7943 flowtable, 7944 &flowtable->hook_list) < 0) 7945 goto done; 7946 7947 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 7948 cont: 7949 idx++; 7950 } 7951 } 7952 done: 7953 rcu_read_unlock(); 7954 7955 cb->args[0] = idx; 7956 return skb->len; 7957 } 7958 7959 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb) 7960 { 7961 const struct nlattr * const *nla = cb->data; 7962 struct nft_flowtable_filter *filter = NULL; 7963 7964 if (nla[NFTA_FLOWTABLE_TABLE]) { 7965 filter = kzalloc(sizeof(*filter), GFP_ATOMIC); 7966 if (!filter) 7967 return -ENOMEM; 7968 7969 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE], 7970 GFP_ATOMIC); 7971 if (!filter->table) { 7972 kfree(filter); 7973 return -ENOMEM; 7974 } 7975 } 7976 7977 cb->data = filter; 7978 return 0; 7979 } 7980 7981 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb) 7982 { 7983 struct nft_flowtable_filter *filter = cb->data; 7984 7985 if (!filter) 7986 return 0; 7987 7988 kfree(filter->table); 7989 kfree(filter); 7990 7991 return 0; 7992 } 7993 7994 /* called with rcu_read_lock held */ 7995 static int nf_tables_getflowtable(struct sk_buff *skb, 7996 const struct nfnl_info *info, 7997 const struct nlattr * const nla[]) 7998 { 7999 u8 genmask = nft_genmask_cur(info->net); 8000 u8 family = info->nfmsg->nfgen_family; 8001 struct nft_flowtable *flowtable; 8002 const struct nft_table *table; 8003 struct net *net = info->net; 8004 struct sk_buff *skb2; 8005 int err; 8006 8007 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 8008 struct netlink_dump_control c = { 8009 .start = nf_tables_dump_flowtable_start, 8010 .dump = nf_tables_dump_flowtable, 8011 .done = nf_tables_dump_flowtable_done, 8012 .module = THIS_MODULE, 8013 .data = (void *)nla, 8014 }; 8015 8016 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 8017 } 8018 8019 if (!nla[NFTA_FLOWTABLE_NAME]) 8020 return -EINVAL; 8021 8022 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 8023 genmask, 0); 8024 if (IS_ERR(table)) 8025 return PTR_ERR(table); 8026 8027 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], 8028 genmask); 8029 if (IS_ERR(flowtable)) 8030 return PTR_ERR(flowtable); 8031 8032 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 8033 if (!skb2) 8034 return -ENOMEM; 8035 8036 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid, 8037 info->nlh->nlmsg_seq, 8038 NFT_MSG_NEWFLOWTABLE, 0, family, 8039 flowtable, &flowtable->hook_list); 8040 if (err < 0) 8041 goto err_fill_flowtable_info; 8042 8043 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 8044 8045 err_fill_flowtable_info: 8046 kfree_skb(skb2); 8047 return err; 8048 } 8049 8050 static void nf_tables_flowtable_notify(struct nft_ctx *ctx, 8051 struct nft_flowtable *flowtable, 8052 struct list_head *hook_list, 8053 int event) 8054 { 8055 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 8056 struct sk_buff *skb; 8057 u16 flags = 0; 8058 int err; 8059 8060 if (!ctx->report && 8061 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 8062 return; 8063 8064 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 8065 if (skb == NULL) 8066 goto err; 8067 8068 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 8069 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 8070 8071 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid, 8072 ctx->seq, event, flags, 8073 ctx->family, flowtable, hook_list); 8074 if (err < 0) { 8075 kfree_skb(skb); 8076 goto err; 8077 } 8078 8079 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 8080 return; 8081 err: 8082 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 8083 } 8084 8085 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable) 8086 { 8087 struct nft_hook *hook, *next; 8088 8089 flowtable->data.type->free(&flowtable->data); 8090 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) { 8091 flowtable->data.type->setup(&flowtable->data, hook->ops.dev, 8092 FLOW_BLOCK_UNBIND); 8093 list_del_rcu(&hook->list); 8094 kfree(hook); 8095 } 8096 kfree(flowtable->name); 8097 module_put(flowtable->data.type->owner); 8098 kfree(flowtable); 8099 } 8100 8101 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, 8102 u32 portid, u32 seq) 8103 { 8104 struct nftables_pernet *nft_net = nft_pernet(net); 8105 struct nlmsghdr *nlh; 8106 char buf[TASK_COMM_LEN]; 8107 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); 8108 8109 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC, 8110 NFNETLINK_V0, nft_base_seq(net)); 8111 if (!nlh) 8112 goto nla_put_failure; 8113 8114 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) || 8115 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) || 8116 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current))) 8117 goto nla_put_failure; 8118 8119 nlmsg_end(skb, nlh); 8120 return 0; 8121 8122 nla_put_failure: 8123 nlmsg_trim(skb, nlh); 8124 return -EMSGSIZE; 8125 } 8126 8127 static void nft_flowtable_event(unsigned long event, struct net_device *dev, 8128 struct nft_flowtable *flowtable) 8129 { 8130 struct nft_hook *hook; 8131 8132 list_for_each_entry(hook, &flowtable->hook_list, list) { 8133 if (hook->ops.dev != dev) 8134 continue; 8135 8136 /* flow_offload_netdev_event() cleans up entries for us. */ 8137 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook); 8138 list_del_rcu(&hook->list); 8139 kfree_rcu(hook, rcu); 8140 break; 8141 } 8142 } 8143 8144 static int nf_tables_flowtable_event(struct notifier_block *this, 8145 unsigned long event, void *ptr) 8146 { 8147 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 8148 struct nft_flowtable *flowtable; 8149 struct nftables_pernet *nft_net; 8150 struct nft_table *table; 8151 struct net *net; 8152 8153 if (event != NETDEV_UNREGISTER) 8154 return 0; 8155 8156 net = dev_net(dev); 8157 nft_net = nft_pernet(net); 8158 mutex_lock(&nft_net->commit_mutex); 8159 list_for_each_entry(table, &nft_net->tables, list) { 8160 list_for_each_entry(flowtable, &table->flowtables, list) { 8161 nft_flowtable_event(event, dev, flowtable); 8162 } 8163 } 8164 mutex_unlock(&nft_net->commit_mutex); 8165 8166 return NOTIFY_DONE; 8167 } 8168 8169 static struct notifier_block nf_tables_flowtable_notifier = { 8170 .notifier_call = nf_tables_flowtable_event, 8171 }; 8172 8173 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, 8174 int event) 8175 { 8176 struct nlmsghdr *nlh = nlmsg_hdr(skb); 8177 struct sk_buff *skb2; 8178 int err; 8179 8180 if (!nlmsg_report(nlh) && 8181 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 8182 return; 8183 8184 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 8185 if (skb2 == NULL) 8186 goto err; 8187 8188 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, 8189 nlh->nlmsg_seq); 8190 if (err < 0) { 8191 kfree_skb(skb2); 8192 goto err; 8193 } 8194 8195 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, 8196 nlmsg_report(nlh), GFP_KERNEL); 8197 return; 8198 err: 8199 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, 8200 -ENOBUFS); 8201 } 8202 8203 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info, 8204 const struct nlattr * const nla[]) 8205 { 8206 struct sk_buff *skb2; 8207 int err; 8208 8209 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 8210 if (skb2 == NULL) 8211 return -ENOMEM; 8212 8213 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid, 8214 info->nlh->nlmsg_seq); 8215 if (err < 0) 8216 goto err_fill_gen_info; 8217 8218 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 8219 8220 err_fill_gen_info: 8221 kfree_skb(skb2); 8222 return err; 8223 } 8224 8225 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { 8226 [NFT_MSG_NEWTABLE] = { 8227 .call = nf_tables_newtable, 8228 .type = NFNL_CB_BATCH, 8229 .attr_count = NFTA_TABLE_MAX, 8230 .policy = nft_table_policy, 8231 }, 8232 [NFT_MSG_GETTABLE] = { 8233 .call = nf_tables_gettable, 8234 .type = NFNL_CB_RCU, 8235 .attr_count = NFTA_TABLE_MAX, 8236 .policy = nft_table_policy, 8237 }, 8238 [NFT_MSG_DELTABLE] = { 8239 .call = nf_tables_deltable, 8240 .type = NFNL_CB_BATCH, 8241 .attr_count = NFTA_TABLE_MAX, 8242 .policy = nft_table_policy, 8243 }, 8244 [NFT_MSG_NEWCHAIN] = { 8245 .call = nf_tables_newchain, 8246 .type = NFNL_CB_BATCH, 8247 .attr_count = NFTA_CHAIN_MAX, 8248 .policy = nft_chain_policy, 8249 }, 8250 [NFT_MSG_GETCHAIN] = { 8251 .call = nf_tables_getchain, 8252 .type = NFNL_CB_RCU, 8253 .attr_count = NFTA_CHAIN_MAX, 8254 .policy = nft_chain_policy, 8255 }, 8256 [NFT_MSG_DELCHAIN] = { 8257 .call = nf_tables_delchain, 8258 .type = NFNL_CB_BATCH, 8259 .attr_count = NFTA_CHAIN_MAX, 8260 .policy = nft_chain_policy, 8261 }, 8262 [NFT_MSG_NEWRULE] = { 8263 .call = nf_tables_newrule, 8264 .type = NFNL_CB_BATCH, 8265 .attr_count = NFTA_RULE_MAX, 8266 .policy = nft_rule_policy, 8267 }, 8268 [NFT_MSG_GETRULE] = { 8269 .call = nf_tables_getrule, 8270 .type = NFNL_CB_RCU, 8271 .attr_count = NFTA_RULE_MAX, 8272 .policy = nft_rule_policy, 8273 }, 8274 [NFT_MSG_DELRULE] = { 8275 .call = nf_tables_delrule, 8276 .type = NFNL_CB_BATCH, 8277 .attr_count = NFTA_RULE_MAX, 8278 .policy = nft_rule_policy, 8279 }, 8280 [NFT_MSG_NEWSET] = { 8281 .call = nf_tables_newset, 8282 .type = NFNL_CB_BATCH, 8283 .attr_count = NFTA_SET_MAX, 8284 .policy = nft_set_policy, 8285 }, 8286 [NFT_MSG_GETSET] = { 8287 .call = nf_tables_getset, 8288 .type = NFNL_CB_RCU, 8289 .attr_count = NFTA_SET_MAX, 8290 .policy = nft_set_policy, 8291 }, 8292 [NFT_MSG_DELSET] = { 8293 .call = nf_tables_delset, 8294 .type = NFNL_CB_BATCH, 8295 .attr_count = NFTA_SET_MAX, 8296 .policy = nft_set_policy, 8297 }, 8298 [NFT_MSG_NEWSETELEM] = { 8299 .call = nf_tables_newsetelem, 8300 .type = NFNL_CB_BATCH, 8301 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8302 .policy = nft_set_elem_list_policy, 8303 }, 8304 [NFT_MSG_GETSETELEM] = { 8305 .call = nf_tables_getsetelem, 8306 .type = NFNL_CB_RCU, 8307 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8308 .policy = nft_set_elem_list_policy, 8309 }, 8310 [NFT_MSG_DELSETELEM] = { 8311 .call = nf_tables_delsetelem, 8312 .type = NFNL_CB_BATCH, 8313 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8314 .policy = nft_set_elem_list_policy, 8315 }, 8316 [NFT_MSG_GETGEN] = { 8317 .call = nf_tables_getgen, 8318 .type = NFNL_CB_RCU, 8319 }, 8320 [NFT_MSG_NEWOBJ] = { 8321 .call = nf_tables_newobj, 8322 .type = NFNL_CB_BATCH, 8323 .attr_count = NFTA_OBJ_MAX, 8324 .policy = nft_obj_policy, 8325 }, 8326 [NFT_MSG_GETOBJ] = { 8327 .call = nf_tables_getobj, 8328 .type = NFNL_CB_RCU, 8329 .attr_count = NFTA_OBJ_MAX, 8330 .policy = nft_obj_policy, 8331 }, 8332 [NFT_MSG_DELOBJ] = { 8333 .call = nf_tables_delobj, 8334 .type = NFNL_CB_BATCH, 8335 .attr_count = NFTA_OBJ_MAX, 8336 .policy = nft_obj_policy, 8337 }, 8338 [NFT_MSG_GETOBJ_RESET] = { 8339 .call = nf_tables_getobj, 8340 .type = NFNL_CB_RCU, 8341 .attr_count = NFTA_OBJ_MAX, 8342 .policy = nft_obj_policy, 8343 }, 8344 [NFT_MSG_NEWFLOWTABLE] = { 8345 .call = nf_tables_newflowtable, 8346 .type = NFNL_CB_BATCH, 8347 .attr_count = NFTA_FLOWTABLE_MAX, 8348 .policy = nft_flowtable_policy, 8349 }, 8350 [NFT_MSG_GETFLOWTABLE] = { 8351 .call = nf_tables_getflowtable, 8352 .type = NFNL_CB_RCU, 8353 .attr_count = NFTA_FLOWTABLE_MAX, 8354 .policy = nft_flowtable_policy, 8355 }, 8356 [NFT_MSG_DELFLOWTABLE] = { 8357 .call = nf_tables_delflowtable, 8358 .type = NFNL_CB_BATCH, 8359 .attr_count = NFTA_FLOWTABLE_MAX, 8360 .policy = nft_flowtable_policy, 8361 }, 8362 }; 8363 8364 static int nf_tables_validate(struct net *net) 8365 { 8366 struct nftables_pernet *nft_net = nft_pernet(net); 8367 struct nft_table *table; 8368 8369 switch (nft_net->validate_state) { 8370 case NFT_VALIDATE_SKIP: 8371 break; 8372 case NFT_VALIDATE_NEED: 8373 nft_validate_state_update(net, NFT_VALIDATE_DO); 8374 fallthrough; 8375 case NFT_VALIDATE_DO: 8376 list_for_each_entry(table, &nft_net->tables, list) { 8377 if (nft_table_validate(net, table) < 0) 8378 return -EAGAIN; 8379 } 8380 break; 8381 } 8382 8383 return 0; 8384 } 8385 8386 /* a drop policy has to be deferred until all rules have been activated, 8387 * otherwise a large ruleset that contains a drop-policy base chain will 8388 * cause all packets to get dropped until the full transaction has been 8389 * processed. 8390 * 8391 * We defer the drop policy until the transaction has been finalized. 8392 */ 8393 static void nft_chain_commit_drop_policy(struct nft_trans *trans) 8394 { 8395 struct nft_base_chain *basechain; 8396 8397 if (nft_trans_chain_policy(trans) != NF_DROP) 8398 return; 8399 8400 if (!nft_is_base_chain(trans->ctx.chain)) 8401 return; 8402 8403 basechain = nft_base_chain(trans->ctx.chain); 8404 basechain->policy = NF_DROP; 8405 } 8406 8407 static void nft_chain_commit_update(struct nft_trans *trans) 8408 { 8409 struct nft_base_chain *basechain; 8410 8411 if (nft_trans_chain_name(trans)) { 8412 rhltable_remove(&trans->ctx.table->chains_ht, 8413 &trans->ctx.chain->rhlhead, 8414 nft_chain_ht_params); 8415 swap(trans->ctx.chain->name, nft_trans_chain_name(trans)); 8416 rhltable_insert_key(&trans->ctx.table->chains_ht, 8417 trans->ctx.chain->name, 8418 &trans->ctx.chain->rhlhead, 8419 nft_chain_ht_params); 8420 } 8421 8422 if (!nft_is_base_chain(trans->ctx.chain)) 8423 return; 8424 8425 nft_chain_stats_replace(trans); 8426 8427 basechain = nft_base_chain(trans->ctx.chain); 8428 8429 switch (nft_trans_chain_policy(trans)) { 8430 case NF_DROP: 8431 case NF_ACCEPT: 8432 basechain->policy = nft_trans_chain_policy(trans); 8433 break; 8434 } 8435 } 8436 8437 static void nft_obj_commit_update(struct nft_trans *trans) 8438 { 8439 struct nft_object *newobj; 8440 struct nft_object *obj; 8441 8442 obj = nft_trans_obj(trans); 8443 newobj = nft_trans_obj_newobj(trans); 8444 8445 if (obj->ops->update) 8446 obj->ops->update(obj, newobj); 8447 8448 nft_obj_destroy(&trans->ctx, newobj); 8449 } 8450 8451 static void nft_commit_release(struct nft_trans *trans) 8452 { 8453 switch (trans->msg_type) { 8454 case NFT_MSG_DELTABLE: 8455 nf_tables_table_destroy(&trans->ctx); 8456 break; 8457 case NFT_MSG_NEWCHAIN: 8458 free_percpu(nft_trans_chain_stats(trans)); 8459 kfree(nft_trans_chain_name(trans)); 8460 break; 8461 case NFT_MSG_DELCHAIN: 8462 nf_tables_chain_destroy(&trans->ctx); 8463 break; 8464 case NFT_MSG_DELRULE: 8465 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 8466 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 8467 8468 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); 8469 break; 8470 case NFT_MSG_DELSET: 8471 nft_set_destroy(&trans->ctx, nft_trans_set(trans)); 8472 break; 8473 case NFT_MSG_DELSETELEM: 8474 nf_tables_set_elem_destroy(&trans->ctx, 8475 nft_trans_elem_set(trans), 8476 nft_trans_elem(trans).priv); 8477 break; 8478 case NFT_MSG_DELOBJ: 8479 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); 8480 break; 8481 case NFT_MSG_DELFLOWTABLE: 8482 if (nft_trans_flowtable_update(trans)) 8483 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans)); 8484 else 8485 nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); 8486 break; 8487 } 8488 8489 if (trans->put_net) 8490 put_net(trans->ctx.net); 8491 8492 kfree(trans); 8493 } 8494 8495 static void nf_tables_trans_destroy_work(struct work_struct *w) 8496 { 8497 struct nft_trans *trans, *next; 8498 LIST_HEAD(head); 8499 8500 spin_lock(&nf_tables_destroy_list_lock); 8501 list_splice_init(&nf_tables_destroy_list, &head); 8502 spin_unlock(&nf_tables_destroy_list_lock); 8503 8504 if (list_empty(&head)) 8505 return; 8506 8507 synchronize_rcu(); 8508 8509 list_for_each_entry_safe(trans, next, &head, list) { 8510 list_del(&trans->list); 8511 nft_commit_release(trans); 8512 } 8513 } 8514 8515 void nf_tables_trans_destroy_flush_work(void) 8516 { 8517 flush_work(&trans_destroy_work); 8518 } 8519 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work); 8520 8521 static bool nft_expr_reduce(struct nft_regs_track *track, 8522 const struct nft_expr *expr) 8523 { 8524 return false; 8525 } 8526 8527 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain) 8528 { 8529 const struct nft_expr *expr, *last; 8530 struct nft_regs_track track = {}; 8531 unsigned int size, data_size; 8532 void *data, *data_boundary; 8533 struct nft_rule_dp *prule; 8534 struct nft_rule *rule; 8535 8536 /* already handled or inactive chain? */ 8537 if (chain->blob_next || !nft_is_active_next(net, chain)) 8538 return 0; 8539 8540 data_size = 0; 8541 list_for_each_entry(rule, &chain->rules, list) { 8542 if (nft_is_active_next(net, rule)) { 8543 data_size += sizeof(*prule) + rule->dlen; 8544 if (data_size > INT_MAX) 8545 return -ENOMEM; 8546 } 8547 } 8548 data_size += offsetof(struct nft_rule_dp, data); /* last rule */ 8549 8550 chain->blob_next = nf_tables_chain_alloc_rules(data_size); 8551 if (!chain->blob_next) 8552 return -ENOMEM; 8553 8554 data = (void *)chain->blob_next->data; 8555 data_boundary = data + data_size; 8556 size = 0; 8557 8558 list_for_each_entry(rule, &chain->rules, list) { 8559 if (!nft_is_active_next(net, rule)) 8560 continue; 8561 8562 prule = (struct nft_rule_dp *)data; 8563 data += offsetof(struct nft_rule_dp, data); 8564 if (WARN_ON_ONCE(data > data_boundary)) 8565 return -ENOMEM; 8566 8567 size = 0; 8568 track.last = nft_expr_last(rule); 8569 nft_rule_for_each_expr(expr, last, rule) { 8570 track.cur = expr; 8571 8572 if (nft_expr_reduce(&track, expr)) { 8573 expr = track.cur; 8574 continue; 8575 } 8576 8577 if (WARN_ON_ONCE(data + expr->ops->size > data_boundary)) 8578 return -ENOMEM; 8579 8580 memcpy(data + size, expr, expr->ops->size); 8581 size += expr->ops->size; 8582 } 8583 if (WARN_ON_ONCE(size >= 1 << 12)) 8584 return -ENOMEM; 8585 8586 prule->handle = rule->handle; 8587 prule->dlen = size; 8588 prule->is_last = 0; 8589 8590 data += size; 8591 size = 0; 8592 chain->blob_next->size += (unsigned long)(data - (void *)prule); 8593 } 8594 8595 prule = (struct nft_rule_dp *)data; 8596 data += offsetof(struct nft_rule_dp, data); 8597 if (WARN_ON_ONCE(data > data_boundary)) 8598 return -ENOMEM; 8599 8600 nft_last_rule(chain->blob_next, prule); 8601 8602 return 0; 8603 } 8604 8605 static void nf_tables_commit_chain_prepare_cancel(struct net *net) 8606 { 8607 struct nftables_pernet *nft_net = nft_pernet(net); 8608 struct nft_trans *trans, *next; 8609 8610 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8611 struct nft_chain *chain = trans->ctx.chain; 8612 8613 if (trans->msg_type == NFT_MSG_NEWRULE || 8614 trans->msg_type == NFT_MSG_DELRULE) { 8615 kvfree(chain->blob_next); 8616 chain->blob_next = NULL; 8617 } 8618 } 8619 } 8620 8621 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h) 8622 { 8623 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h); 8624 8625 kvfree(o->blob); 8626 } 8627 8628 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob) 8629 { 8630 struct nft_rules_old *old; 8631 8632 /* rcu_head is after end marker */ 8633 old = (void *)blob + sizeof(*blob) + blob->size; 8634 old->blob = blob; 8635 8636 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old); 8637 } 8638 8639 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain) 8640 { 8641 struct nft_rule_blob *g0, *g1; 8642 bool next_genbit; 8643 8644 next_genbit = nft_gencursor_next(net); 8645 8646 g0 = rcu_dereference_protected(chain->blob_gen_0, 8647 lockdep_commit_lock_is_held(net)); 8648 g1 = rcu_dereference_protected(chain->blob_gen_1, 8649 lockdep_commit_lock_is_held(net)); 8650 8651 /* No changes to this chain? */ 8652 if (chain->blob_next == NULL) { 8653 /* chain had no change in last or next generation */ 8654 if (g0 == g1) 8655 return; 8656 /* 8657 * chain had no change in this generation; make sure next 8658 * one uses same rules as current generation. 8659 */ 8660 if (next_genbit) { 8661 rcu_assign_pointer(chain->blob_gen_1, g0); 8662 nf_tables_commit_chain_free_rules_old(g1); 8663 } else { 8664 rcu_assign_pointer(chain->blob_gen_0, g1); 8665 nf_tables_commit_chain_free_rules_old(g0); 8666 } 8667 8668 return; 8669 } 8670 8671 if (next_genbit) 8672 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next); 8673 else 8674 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next); 8675 8676 chain->blob_next = NULL; 8677 8678 if (g0 == g1) 8679 return; 8680 8681 if (next_genbit) 8682 nf_tables_commit_chain_free_rules_old(g1); 8683 else 8684 nf_tables_commit_chain_free_rules_old(g0); 8685 } 8686 8687 static void nft_obj_del(struct nft_object *obj) 8688 { 8689 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params); 8690 list_del_rcu(&obj->list); 8691 } 8692 8693 void nft_chain_del(struct nft_chain *chain) 8694 { 8695 struct nft_table *table = chain->table; 8696 8697 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead, 8698 nft_chain_ht_params)); 8699 list_del_rcu(&chain->list); 8700 } 8701 8702 static void nf_tables_module_autoload_cleanup(struct net *net) 8703 { 8704 struct nftables_pernet *nft_net = nft_pernet(net); 8705 struct nft_module_request *req, *next; 8706 8707 WARN_ON_ONCE(!list_empty(&nft_net->commit_list)); 8708 list_for_each_entry_safe(req, next, &nft_net->module_list, list) { 8709 WARN_ON_ONCE(!req->done); 8710 list_del(&req->list); 8711 kfree(req); 8712 } 8713 } 8714 8715 static void nf_tables_commit_release(struct net *net) 8716 { 8717 struct nftables_pernet *nft_net = nft_pernet(net); 8718 struct nft_trans *trans; 8719 8720 /* all side effects have to be made visible. 8721 * For example, if a chain named 'foo' has been deleted, a 8722 * new transaction must not find it anymore. 8723 * 8724 * Memory reclaim happens asynchronously from work queue 8725 * to prevent expensive synchronize_rcu() in commit phase. 8726 */ 8727 if (list_empty(&nft_net->commit_list)) { 8728 nf_tables_module_autoload_cleanup(net); 8729 mutex_unlock(&nft_net->commit_mutex); 8730 return; 8731 } 8732 8733 trans = list_last_entry(&nft_net->commit_list, 8734 struct nft_trans, list); 8735 get_net(trans->ctx.net); 8736 WARN_ON_ONCE(trans->put_net); 8737 8738 trans->put_net = true; 8739 spin_lock(&nf_tables_destroy_list_lock); 8740 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list); 8741 spin_unlock(&nf_tables_destroy_list_lock); 8742 8743 nf_tables_module_autoload_cleanup(net); 8744 schedule_work(&trans_destroy_work); 8745 8746 mutex_unlock(&nft_net->commit_mutex); 8747 } 8748 8749 static void nft_commit_notify(struct net *net, u32 portid) 8750 { 8751 struct nftables_pernet *nft_net = nft_pernet(net); 8752 struct sk_buff *batch_skb = NULL, *nskb, *skb; 8753 unsigned char *data; 8754 int len; 8755 8756 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) { 8757 if (!batch_skb) { 8758 new_batch: 8759 batch_skb = skb; 8760 len = NLMSG_GOODSIZE - skb->len; 8761 list_del(&skb->list); 8762 continue; 8763 } 8764 len -= skb->len; 8765 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) { 8766 data = skb_put(batch_skb, skb->len); 8767 memcpy(data, skb->data, skb->len); 8768 list_del(&skb->list); 8769 kfree_skb(skb); 8770 continue; 8771 } 8772 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES, 8773 NFT_CB(batch_skb).report, GFP_KERNEL); 8774 goto new_batch; 8775 } 8776 8777 if (batch_skb) { 8778 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES, 8779 NFT_CB(batch_skb).report, GFP_KERNEL); 8780 } 8781 8782 WARN_ON_ONCE(!list_empty(&nft_net->notify_list)); 8783 } 8784 8785 static int nf_tables_commit_audit_alloc(struct list_head *adl, 8786 struct nft_table *table) 8787 { 8788 struct nft_audit_data *adp; 8789 8790 list_for_each_entry(adp, adl, list) { 8791 if (adp->table == table) 8792 return 0; 8793 } 8794 adp = kzalloc(sizeof(*adp), GFP_KERNEL); 8795 if (!adp) 8796 return -ENOMEM; 8797 adp->table = table; 8798 list_add(&adp->list, adl); 8799 return 0; 8800 } 8801 8802 static void nf_tables_commit_audit_free(struct list_head *adl) 8803 { 8804 struct nft_audit_data *adp, *adn; 8805 8806 list_for_each_entry_safe(adp, adn, adl, list) { 8807 list_del(&adp->list); 8808 kfree(adp); 8809 } 8810 } 8811 8812 static void nf_tables_commit_audit_collect(struct list_head *adl, 8813 struct nft_table *table, u32 op) 8814 { 8815 struct nft_audit_data *adp; 8816 8817 list_for_each_entry(adp, adl, list) { 8818 if (adp->table == table) 8819 goto found; 8820 } 8821 WARN_ONCE(1, "table=%s not expected in commit list", table->name); 8822 return; 8823 found: 8824 adp->entries++; 8825 if (!adp->op || adp->op > op) 8826 adp->op = op; 8827 } 8828 8829 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22) 8830 8831 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation) 8832 { 8833 struct nft_audit_data *adp, *adn; 8834 char aubuf[AUNFTABLENAMELEN]; 8835 8836 list_for_each_entry_safe(adp, adn, adl, list) { 8837 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name, 8838 generation); 8839 audit_log_nfcfg(aubuf, adp->table->family, adp->entries, 8840 nft2audit_op[adp->op], GFP_KERNEL); 8841 list_del(&adp->list); 8842 kfree(adp); 8843 } 8844 } 8845 8846 static int nf_tables_commit(struct net *net, struct sk_buff *skb) 8847 { 8848 struct nftables_pernet *nft_net = nft_pernet(net); 8849 struct nft_trans *trans, *next; 8850 struct nft_trans_elem *te; 8851 struct nft_chain *chain; 8852 struct nft_table *table; 8853 unsigned int base_seq; 8854 LIST_HEAD(adl); 8855 int err; 8856 8857 if (list_empty(&nft_net->commit_list)) { 8858 mutex_unlock(&nft_net->commit_mutex); 8859 return 0; 8860 } 8861 8862 /* 0. Validate ruleset, otherwise roll back for error reporting. */ 8863 if (nf_tables_validate(net) < 0) 8864 return -EAGAIN; 8865 8866 err = nft_flow_rule_offload_commit(net); 8867 if (err < 0) 8868 return err; 8869 8870 /* 1. Allocate space for next generation rules_gen_X[] */ 8871 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8872 int ret; 8873 8874 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table); 8875 if (ret) { 8876 nf_tables_commit_chain_prepare_cancel(net); 8877 nf_tables_commit_audit_free(&adl); 8878 return ret; 8879 } 8880 if (trans->msg_type == NFT_MSG_NEWRULE || 8881 trans->msg_type == NFT_MSG_DELRULE) { 8882 chain = trans->ctx.chain; 8883 8884 ret = nf_tables_commit_chain_prepare(net, chain); 8885 if (ret < 0) { 8886 nf_tables_commit_chain_prepare_cancel(net); 8887 nf_tables_commit_audit_free(&adl); 8888 return ret; 8889 } 8890 } 8891 } 8892 8893 /* step 2. Make rules_gen_X visible to packet path */ 8894 list_for_each_entry(table, &nft_net->tables, list) { 8895 list_for_each_entry(chain, &table->chains, list) 8896 nf_tables_commit_chain(net, chain); 8897 } 8898 8899 /* 8900 * Bump generation counter, invalidate any dump in progress. 8901 * Cannot fail after this point. 8902 */ 8903 base_seq = READ_ONCE(nft_net->base_seq); 8904 while (++base_seq == 0) 8905 ; 8906 8907 WRITE_ONCE(nft_net->base_seq, base_seq); 8908 8909 /* step 3. Start new generation, rules_gen_X now in use. */ 8910 net->nft.gencursor = nft_gencursor_next(net); 8911 8912 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8913 nf_tables_commit_audit_collect(&adl, trans->ctx.table, 8914 trans->msg_type); 8915 switch (trans->msg_type) { 8916 case NFT_MSG_NEWTABLE: 8917 if (nft_trans_table_update(trans)) { 8918 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) { 8919 nft_trans_destroy(trans); 8920 break; 8921 } 8922 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT) 8923 nf_tables_table_disable(net, trans->ctx.table); 8924 8925 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE; 8926 } else { 8927 nft_clear(net, trans->ctx.table); 8928 } 8929 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); 8930 nft_trans_destroy(trans); 8931 break; 8932 case NFT_MSG_DELTABLE: 8933 list_del_rcu(&trans->ctx.table->list); 8934 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); 8935 break; 8936 case NFT_MSG_NEWCHAIN: 8937 if (nft_trans_chain_update(trans)) { 8938 nft_chain_commit_update(trans); 8939 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); 8940 /* trans destroyed after rcu grace period */ 8941 } else { 8942 nft_chain_commit_drop_policy(trans); 8943 nft_clear(net, trans->ctx.chain); 8944 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); 8945 nft_trans_destroy(trans); 8946 } 8947 break; 8948 case NFT_MSG_DELCHAIN: 8949 nft_chain_del(trans->ctx.chain); 8950 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); 8951 nf_tables_unregister_hook(trans->ctx.net, 8952 trans->ctx.table, 8953 trans->ctx.chain); 8954 break; 8955 case NFT_MSG_NEWRULE: 8956 nft_clear(trans->ctx.net, nft_trans_rule(trans)); 8957 nf_tables_rule_notify(&trans->ctx, 8958 nft_trans_rule(trans), 8959 NFT_MSG_NEWRULE); 8960 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 8961 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 8962 8963 nft_trans_destroy(trans); 8964 break; 8965 case NFT_MSG_DELRULE: 8966 list_del_rcu(&nft_trans_rule(trans)->list); 8967 nf_tables_rule_notify(&trans->ctx, 8968 nft_trans_rule(trans), 8969 NFT_MSG_DELRULE); 8970 nft_rule_expr_deactivate(&trans->ctx, 8971 nft_trans_rule(trans), 8972 NFT_TRANS_COMMIT); 8973 break; 8974 case NFT_MSG_NEWSET: 8975 nft_clear(net, nft_trans_set(trans)); 8976 /* This avoids hitting -EBUSY when deleting the table 8977 * from the transaction. 8978 */ 8979 if (nft_set_is_anonymous(nft_trans_set(trans)) && 8980 !list_empty(&nft_trans_set(trans)->bindings)) 8981 trans->ctx.table->use--; 8982 8983 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), 8984 NFT_MSG_NEWSET, GFP_KERNEL); 8985 nft_trans_destroy(trans); 8986 break; 8987 case NFT_MSG_DELSET: 8988 list_del_rcu(&nft_trans_set(trans)->list); 8989 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), 8990 NFT_MSG_DELSET, GFP_KERNEL); 8991 break; 8992 case NFT_MSG_NEWSETELEM: 8993 te = (struct nft_trans_elem *)trans->data; 8994 8995 nft_setelem_activate(net, te->set, &te->elem); 8996 nf_tables_setelem_notify(&trans->ctx, te->set, 8997 &te->elem, 8998 NFT_MSG_NEWSETELEM); 8999 nft_trans_destroy(trans); 9000 break; 9001 case NFT_MSG_DELSETELEM: 9002 te = (struct nft_trans_elem *)trans->data; 9003 9004 nf_tables_setelem_notify(&trans->ctx, te->set, 9005 &te->elem, 9006 NFT_MSG_DELSETELEM); 9007 nft_setelem_remove(net, te->set, &te->elem); 9008 if (!nft_setelem_is_catchall(te->set, &te->elem)) { 9009 atomic_dec(&te->set->nelems); 9010 te->set->ndeact--; 9011 } 9012 break; 9013 case NFT_MSG_NEWOBJ: 9014 if (nft_trans_obj_update(trans)) { 9015 nft_obj_commit_update(trans); 9016 nf_tables_obj_notify(&trans->ctx, 9017 nft_trans_obj(trans), 9018 NFT_MSG_NEWOBJ); 9019 } else { 9020 nft_clear(net, nft_trans_obj(trans)); 9021 nf_tables_obj_notify(&trans->ctx, 9022 nft_trans_obj(trans), 9023 NFT_MSG_NEWOBJ); 9024 nft_trans_destroy(trans); 9025 } 9026 break; 9027 case NFT_MSG_DELOBJ: 9028 nft_obj_del(nft_trans_obj(trans)); 9029 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), 9030 NFT_MSG_DELOBJ); 9031 break; 9032 case NFT_MSG_NEWFLOWTABLE: 9033 if (nft_trans_flowtable_update(trans)) { 9034 nft_trans_flowtable(trans)->data.flags = 9035 nft_trans_flowtable_flags(trans); 9036 nf_tables_flowtable_notify(&trans->ctx, 9037 nft_trans_flowtable(trans), 9038 &nft_trans_flowtable_hooks(trans), 9039 NFT_MSG_NEWFLOWTABLE); 9040 list_splice(&nft_trans_flowtable_hooks(trans), 9041 &nft_trans_flowtable(trans)->hook_list); 9042 } else { 9043 nft_clear(net, nft_trans_flowtable(trans)); 9044 nf_tables_flowtable_notify(&trans->ctx, 9045 nft_trans_flowtable(trans), 9046 &nft_trans_flowtable(trans)->hook_list, 9047 NFT_MSG_NEWFLOWTABLE); 9048 } 9049 nft_trans_destroy(trans); 9050 break; 9051 case NFT_MSG_DELFLOWTABLE: 9052 if (nft_trans_flowtable_update(trans)) { 9053 nf_tables_flowtable_notify(&trans->ctx, 9054 nft_trans_flowtable(trans), 9055 &nft_trans_flowtable_hooks(trans), 9056 NFT_MSG_DELFLOWTABLE); 9057 nft_unregister_flowtable_net_hooks(net, 9058 &nft_trans_flowtable_hooks(trans)); 9059 } else { 9060 list_del_rcu(&nft_trans_flowtable(trans)->list); 9061 nf_tables_flowtable_notify(&trans->ctx, 9062 nft_trans_flowtable(trans), 9063 &nft_trans_flowtable(trans)->hook_list, 9064 NFT_MSG_DELFLOWTABLE); 9065 nft_unregister_flowtable_net_hooks(net, 9066 &nft_trans_flowtable(trans)->hook_list); 9067 } 9068 break; 9069 } 9070 } 9071 9072 nft_commit_notify(net, NETLINK_CB(skb).portid); 9073 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); 9074 nf_tables_commit_audit_log(&adl, nft_net->base_seq); 9075 nf_tables_commit_release(net); 9076 9077 return 0; 9078 } 9079 9080 static void nf_tables_module_autoload(struct net *net) 9081 { 9082 struct nftables_pernet *nft_net = nft_pernet(net); 9083 struct nft_module_request *req, *next; 9084 LIST_HEAD(module_list); 9085 9086 list_splice_init(&nft_net->module_list, &module_list); 9087 mutex_unlock(&nft_net->commit_mutex); 9088 list_for_each_entry_safe(req, next, &module_list, list) { 9089 request_module("%s", req->module); 9090 req->done = true; 9091 } 9092 mutex_lock(&nft_net->commit_mutex); 9093 list_splice(&module_list, &nft_net->module_list); 9094 } 9095 9096 static void nf_tables_abort_release(struct nft_trans *trans) 9097 { 9098 switch (trans->msg_type) { 9099 case NFT_MSG_NEWTABLE: 9100 nf_tables_table_destroy(&trans->ctx); 9101 break; 9102 case NFT_MSG_NEWCHAIN: 9103 nf_tables_chain_destroy(&trans->ctx); 9104 break; 9105 case NFT_MSG_NEWRULE: 9106 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); 9107 break; 9108 case NFT_MSG_NEWSET: 9109 nft_set_destroy(&trans->ctx, nft_trans_set(trans)); 9110 break; 9111 case NFT_MSG_NEWSETELEM: 9112 nft_set_elem_destroy(nft_trans_elem_set(trans), 9113 nft_trans_elem(trans).priv, true); 9114 break; 9115 case NFT_MSG_NEWOBJ: 9116 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); 9117 break; 9118 case NFT_MSG_NEWFLOWTABLE: 9119 if (nft_trans_flowtable_update(trans)) 9120 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans)); 9121 else 9122 nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); 9123 break; 9124 } 9125 kfree(trans); 9126 } 9127 9128 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action) 9129 { 9130 struct nftables_pernet *nft_net = nft_pernet(net); 9131 struct nft_trans *trans, *next; 9132 struct nft_trans_elem *te; 9133 9134 if (action == NFNL_ABORT_VALIDATE && 9135 nf_tables_validate(net) < 0) 9136 return -EAGAIN; 9137 9138 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list, 9139 list) { 9140 switch (trans->msg_type) { 9141 case NFT_MSG_NEWTABLE: 9142 if (nft_trans_table_update(trans)) { 9143 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) { 9144 nft_trans_destroy(trans); 9145 break; 9146 } 9147 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) { 9148 nf_tables_table_disable(net, trans->ctx.table); 9149 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; 9150 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) { 9151 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT; 9152 } 9153 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE; 9154 nft_trans_destroy(trans); 9155 } else { 9156 list_del_rcu(&trans->ctx.table->list); 9157 } 9158 break; 9159 case NFT_MSG_DELTABLE: 9160 nft_clear(trans->ctx.net, trans->ctx.table); 9161 nft_trans_destroy(trans); 9162 break; 9163 case NFT_MSG_NEWCHAIN: 9164 if (nft_trans_chain_update(trans)) { 9165 free_percpu(nft_trans_chain_stats(trans)); 9166 kfree(nft_trans_chain_name(trans)); 9167 nft_trans_destroy(trans); 9168 } else { 9169 if (nft_chain_is_bound(trans->ctx.chain)) { 9170 nft_trans_destroy(trans); 9171 break; 9172 } 9173 trans->ctx.table->use--; 9174 nft_chain_del(trans->ctx.chain); 9175 nf_tables_unregister_hook(trans->ctx.net, 9176 trans->ctx.table, 9177 trans->ctx.chain); 9178 } 9179 break; 9180 case NFT_MSG_DELCHAIN: 9181 trans->ctx.table->use++; 9182 nft_clear(trans->ctx.net, trans->ctx.chain); 9183 nft_trans_destroy(trans); 9184 break; 9185 case NFT_MSG_NEWRULE: 9186 trans->ctx.chain->use--; 9187 list_del_rcu(&nft_trans_rule(trans)->list); 9188 nft_rule_expr_deactivate(&trans->ctx, 9189 nft_trans_rule(trans), 9190 NFT_TRANS_ABORT); 9191 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 9192 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 9193 break; 9194 case NFT_MSG_DELRULE: 9195 trans->ctx.chain->use++; 9196 nft_clear(trans->ctx.net, nft_trans_rule(trans)); 9197 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans)); 9198 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 9199 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 9200 9201 nft_trans_destroy(trans); 9202 break; 9203 case NFT_MSG_NEWSET: 9204 trans->ctx.table->use--; 9205 if (nft_trans_set_bound(trans)) { 9206 nft_trans_destroy(trans); 9207 break; 9208 } 9209 list_del_rcu(&nft_trans_set(trans)->list); 9210 break; 9211 case NFT_MSG_DELSET: 9212 trans->ctx.table->use++; 9213 nft_clear(trans->ctx.net, nft_trans_set(trans)); 9214 nft_trans_destroy(trans); 9215 break; 9216 case NFT_MSG_NEWSETELEM: 9217 if (nft_trans_elem_set_bound(trans)) { 9218 nft_trans_destroy(trans); 9219 break; 9220 } 9221 te = (struct nft_trans_elem *)trans->data; 9222 nft_setelem_remove(net, te->set, &te->elem); 9223 if (!nft_setelem_is_catchall(te->set, &te->elem)) 9224 atomic_dec(&te->set->nelems); 9225 break; 9226 case NFT_MSG_DELSETELEM: 9227 te = (struct nft_trans_elem *)trans->data; 9228 9229 nft_setelem_data_activate(net, te->set, &te->elem); 9230 nft_setelem_activate(net, te->set, &te->elem); 9231 if (!nft_setelem_is_catchall(te->set, &te->elem)) 9232 te->set->ndeact--; 9233 9234 nft_trans_destroy(trans); 9235 break; 9236 case NFT_MSG_NEWOBJ: 9237 if (nft_trans_obj_update(trans)) { 9238 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans)); 9239 nft_trans_destroy(trans); 9240 } else { 9241 trans->ctx.table->use--; 9242 nft_obj_del(nft_trans_obj(trans)); 9243 } 9244 break; 9245 case NFT_MSG_DELOBJ: 9246 trans->ctx.table->use++; 9247 nft_clear(trans->ctx.net, nft_trans_obj(trans)); 9248 nft_trans_destroy(trans); 9249 break; 9250 case NFT_MSG_NEWFLOWTABLE: 9251 if (nft_trans_flowtable_update(trans)) { 9252 nft_unregister_flowtable_net_hooks(net, 9253 &nft_trans_flowtable_hooks(trans)); 9254 } else { 9255 trans->ctx.table->use--; 9256 list_del_rcu(&nft_trans_flowtable(trans)->list); 9257 nft_unregister_flowtable_net_hooks(net, 9258 &nft_trans_flowtable(trans)->hook_list); 9259 } 9260 break; 9261 case NFT_MSG_DELFLOWTABLE: 9262 if (nft_trans_flowtable_update(trans)) { 9263 list_splice(&nft_trans_flowtable_hooks(trans), 9264 &nft_trans_flowtable(trans)->hook_list); 9265 } else { 9266 trans->ctx.table->use++; 9267 nft_clear(trans->ctx.net, nft_trans_flowtable(trans)); 9268 } 9269 nft_trans_destroy(trans); 9270 break; 9271 } 9272 } 9273 9274 synchronize_rcu(); 9275 9276 list_for_each_entry_safe_reverse(trans, next, 9277 &nft_net->commit_list, list) { 9278 list_del(&trans->list); 9279 nf_tables_abort_release(trans); 9280 } 9281 9282 if (action == NFNL_ABORT_AUTOLOAD) 9283 nf_tables_module_autoload(net); 9284 else 9285 nf_tables_module_autoload_cleanup(net); 9286 9287 return 0; 9288 } 9289 9290 static void nf_tables_cleanup(struct net *net) 9291 { 9292 nft_validate_state_update(net, NFT_VALIDATE_SKIP); 9293 } 9294 9295 static int nf_tables_abort(struct net *net, struct sk_buff *skb, 9296 enum nfnl_abort_action action) 9297 { 9298 struct nftables_pernet *nft_net = nft_pernet(net); 9299 int ret = __nf_tables_abort(net, action); 9300 9301 mutex_unlock(&nft_net->commit_mutex); 9302 9303 return ret; 9304 } 9305 9306 static bool nf_tables_valid_genid(struct net *net, u32 genid) 9307 { 9308 struct nftables_pernet *nft_net = nft_pernet(net); 9309 bool genid_ok; 9310 9311 mutex_lock(&nft_net->commit_mutex); 9312 9313 genid_ok = genid == 0 || nft_net->base_seq == genid; 9314 if (!genid_ok) 9315 mutex_unlock(&nft_net->commit_mutex); 9316 9317 /* else, commit mutex has to be released by commit or abort function */ 9318 return genid_ok; 9319 } 9320 9321 static const struct nfnetlink_subsystem nf_tables_subsys = { 9322 .name = "nf_tables", 9323 .subsys_id = NFNL_SUBSYS_NFTABLES, 9324 .cb_count = NFT_MSG_MAX, 9325 .cb = nf_tables_cb, 9326 .commit = nf_tables_commit, 9327 .abort = nf_tables_abort, 9328 .cleanup = nf_tables_cleanup, 9329 .valid_genid = nf_tables_valid_genid, 9330 .owner = THIS_MODULE, 9331 }; 9332 9333 int nft_chain_validate_dependency(const struct nft_chain *chain, 9334 enum nft_chain_types type) 9335 { 9336 const struct nft_base_chain *basechain; 9337 9338 if (nft_is_base_chain(chain)) { 9339 basechain = nft_base_chain(chain); 9340 if (basechain->type->type != type) 9341 return -EOPNOTSUPP; 9342 } 9343 return 0; 9344 } 9345 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); 9346 9347 int nft_chain_validate_hooks(const struct nft_chain *chain, 9348 unsigned int hook_flags) 9349 { 9350 struct nft_base_chain *basechain; 9351 9352 if (nft_is_base_chain(chain)) { 9353 basechain = nft_base_chain(chain); 9354 9355 if ((1 << basechain->ops.hooknum) & hook_flags) 9356 return 0; 9357 9358 return -EOPNOTSUPP; 9359 } 9360 9361 return 0; 9362 } 9363 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); 9364 9365 /* 9366 * Loop detection - walk through the ruleset beginning at the destination chain 9367 * of a new jump until either the source chain is reached (loop) or all 9368 * reachable chains have been traversed. 9369 * 9370 * The loop check is performed whenever a new jump verdict is added to an 9371 * expression or verdict map or a verdict map is bound to a new chain. 9372 */ 9373 9374 static int nf_tables_check_loops(const struct nft_ctx *ctx, 9375 const struct nft_chain *chain); 9376 9377 static int nft_check_loops(const struct nft_ctx *ctx, 9378 const struct nft_set_ext *ext) 9379 { 9380 const struct nft_data *data; 9381 int ret; 9382 9383 data = nft_set_ext_data(ext); 9384 switch (data->verdict.code) { 9385 case NFT_JUMP: 9386 case NFT_GOTO: 9387 ret = nf_tables_check_loops(ctx, data->verdict.chain); 9388 break; 9389 default: 9390 ret = 0; 9391 break; 9392 } 9393 9394 return ret; 9395 } 9396 9397 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, 9398 struct nft_set *set, 9399 const struct nft_set_iter *iter, 9400 struct nft_set_elem *elem) 9401 { 9402 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 9403 9404 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 9405 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) 9406 return 0; 9407 9408 return nft_check_loops(ctx, ext); 9409 } 9410 9411 static int nft_set_catchall_loops(const struct nft_ctx *ctx, 9412 struct nft_set *set) 9413 { 9414 u8 genmask = nft_genmask_next(ctx->net); 9415 struct nft_set_elem_catchall *catchall; 9416 struct nft_set_ext *ext; 9417 int ret = 0; 9418 9419 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 9420 ext = nft_set_elem_ext(set, catchall->elem); 9421 if (!nft_set_elem_active(ext, genmask)) 9422 continue; 9423 9424 ret = nft_check_loops(ctx, ext); 9425 if (ret < 0) 9426 return ret; 9427 } 9428 9429 return ret; 9430 } 9431 9432 static int nf_tables_check_loops(const struct nft_ctx *ctx, 9433 const struct nft_chain *chain) 9434 { 9435 const struct nft_rule *rule; 9436 const struct nft_expr *expr, *last; 9437 struct nft_set *set; 9438 struct nft_set_binding *binding; 9439 struct nft_set_iter iter; 9440 9441 if (ctx->chain == chain) 9442 return -ELOOP; 9443 9444 list_for_each_entry(rule, &chain->rules, list) { 9445 nft_rule_for_each_expr(expr, last, rule) { 9446 struct nft_immediate_expr *priv; 9447 const struct nft_data *data; 9448 int err; 9449 9450 if (strcmp(expr->ops->type->name, "immediate")) 9451 continue; 9452 9453 priv = nft_expr_priv(expr); 9454 if (priv->dreg != NFT_REG_VERDICT) 9455 continue; 9456 9457 data = &priv->data; 9458 switch (data->verdict.code) { 9459 case NFT_JUMP: 9460 case NFT_GOTO: 9461 err = nf_tables_check_loops(ctx, 9462 data->verdict.chain); 9463 if (err < 0) 9464 return err; 9465 break; 9466 default: 9467 break; 9468 } 9469 } 9470 } 9471 9472 list_for_each_entry(set, &ctx->table->sets, list) { 9473 if (!nft_is_active_next(ctx->net, set)) 9474 continue; 9475 if (!(set->flags & NFT_SET_MAP) || 9476 set->dtype != NFT_DATA_VERDICT) 9477 continue; 9478 9479 list_for_each_entry(binding, &set->bindings, list) { 9480 if (!(binding->flags & NFT_SET_MAP) || 9481 binding->chain != chain) 9482 continue; 9483 9484 iter.genmask = nft_genmask_next(ctx->net); 9485 iter.skip = 0; 9486 iter.count = 0; 9487 iter.err = 0; 9488 iter.fn = nf_tables_loop_check_setelem; 9489 9490 set->ops->walk(ctx, set, &iter); 9491 if (!iter.err) 9492 iter.err = nft_set_catchall_loops(ctx, set); 9493 9494 if (iter.err < 0) 9495 return iter.err; 9496 } 9497 } 9498 9499 return 0; 9500 } 9501 9502 /** 9503 * nft_parse_u32_check - fetch u32 attribute and check for maximum value 9504 * 9505 * @attr: netlink attribute to fetch value from 9506 * @max: maximum value to be stored in dest 9507 * @dest: pointer to the variable 9508 * 9509 * Parse, check and store a given u32 netlink attribute into variable. 9510 * This function returns -ERANGE if the value goes over maximum value. 9511 * Otherwise a 0 is returned and the attribute value is stored in the 9512 * destination variable. 9513 */ 9514 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) 9515 { 9516 u32 val; 9517 9518 val = ntohl(nla_get_be32(attr)); 9519 if (val > max) 9520 return -ERANGE; 9521 9522 *dest = val; 9523 return 0; 9524 } 9525 EXPORT_SYMBOL_GPL(nft_parse_u32_check); 9526 9527 static int nft_parse_register(const struct nlattr *attr, u32 *preg) 9528 { 9529 unsigned int reg; 9530 9531 reg = ntohl(nla_get_be32(attr)); 9532 switch (reg) { 9533 case NFT_REG_VERDICT...NFT_REG_4: 9534 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE; 9535 break; 9536 case NFT_REG32_00...NFT_REG32_15: 9537 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; 9538 break; 9539 default: 9540 return -ERANGE; 9541 } 9542 9543 return 0; 9544 } 9545 9546 /** 9547 * nft_dump_register - dump a register value to a netlink attribute 9548 * 9549 * @skb: socket buffer 9550 * @attr: attribute number 9551 * @reg: register number 9552 * 9553 * Construct a netlink attribute containing the register number. For 9554 * compatibility reasons, register numbers being a multiple of 4 are 9555 * translated to the corresponding 128 bit register numbers. 9556 */ 9557 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) 9558 { 9559 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) 9560 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); 9561 else 9562 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; 9563 9564 return nla_put_be32(skb, attr, htonl(reg)); 9565 } 9566 EXPORT_SYMBOL_GPL(nft_dump_register); 9567 9568 static int nft_validate_register_load(enum nft_registers reg, unsigned int len) 9569 { 9570 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) 9571 return -EINVAL; 9572 if (len == 0) 9573 return -EINVAL; 9574 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data)) 9575 return -ERANGE; 9576 9577 return 0; 9578 } 9579 9580 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len) 9581 { 9582 u32 reg; 9583 int err; 9584 9585 err = nft_parse_register(attr, ®); 9586 if (err < 0) 9587 return err; 9588 9589 err = nft_validate_register_load(reg, len); 9590 if (err < 0) 9591 return err; 9592 9593 *sreg = reg; 9594 return 0; 9595 } 9596 EXPORT_SYMBOL_GPL(nft_parse_register_load); 9597 9598 static int nft_validate_register_store(const struct nft_ctx *ctx, 9599 enum nft_registers reg, 9600 const struct nft_data *data, 9601 enum nft_data_types type, 9602 unsigned int len) 9603 { 9604 int err; 9605 9606 switch (reg) { 9607 case NFT_REG_VERDICT: 9608 if (type != NFT_DATA_VERDICT) 9609 return -EINVAL; 9610 9611 if (data != NULL && 9612 (data->verdict.code == NFT_GOTO || 9613 data->verdict.code == NFT_JUMP)) { 9614 err = nf_tables_check_loops(ctx, data->verdict.chain); 9615 if (err < 0) 9616 return err; 9617 } 9618 9619 return 0; 9620 default: 9621 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) 9622 return -EINVAL; 9623 if (len == 0) 9624 return -EINVAL; 9625 if (reg * NFT_REG32_SIZE + len > 9626 sizeof_field(struct nft_regs, data)) 9627 return -ERANGE; 9628 9629 if (data != NULL && type != NFT_DATA_VALUE) 9630 return -EINVAL; 9631 return 0; 9632 } 9633 } 9634 9635 int nft_parse_register_store(const struct nft_ctx *ctx, 9636 const struct nlattr *attr, u8 *dreg, 9637 const struct nft_data *data, 9638 enum nft_data_types type, unsigned int len) 9639 { 9640 int err; 9641 u32 reg; 9642 9643 err = nft_parse_register(attr, ®); 9644 if (err < 0) 9645 return err; 9646 9647 err = nft_validate_register_store(ctx, reg, data, type, len); 9648 if (err < 0) 9649 return err; 9650 9651 *dreg = reg; 9652 return 0; 9653 } 9654 EXPORT_SYMBOL_GPL(nft_parse_register_store); 9655 9656 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { 9657 [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, 9658 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, 9659 .len = NFT_CHAIN_MAXNAMELEN - 1 }, 9660 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 }, 9661 }; 9662 9663 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, 9664 struct nft_data_desc *desc, const struct nlattr *nla) 9665 { 9666 u8 genmask = nft_genmask_next(ctx->net); 9667 struct nlattr *tb[NFTA_VERDICT_MAX + 1]; 9668 struct nft_chain *chain; 9669 int err; 9670 9671 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla, 9672 nft_verdict_policy, NULL); 9673 if (err < 0) 9674 return err; 9675 9676 if (!tb[NFTA_VERDICT_CODE]) 9677 return -EINVAL; 9678 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); 9679 9680 switch (data->verdict.code) { 9681 default: 9682 switch (data->verdict.code & NF_VERDICT_MASK) { 9683 case NF_ACCEPT: 9684 case NF_DROP: 9685 case NF_QUEUE: 9686 break; 9687 default: 9688 return -EINVAL; 9689 } 9690 fallthrough; 9691 case NFT_CONTINUE: 9692 case NFT_BREAK: 9693 case NFT_RETURN: 9694 break; 9695 case NFT_JUMP: 9696 case NFT_GOTO: 9697 if (tb[NFTA_VERDICT_CHAIN]) { 9698 chain = nft_chain_lookup(ctx->net, ctx->table, 9699 tb[NFTA_VERDICT_CHAIN], 9700 genmask); 9701 } else if (tb[NFTA_VERDICT_CHAIN_ID]) { 9702 chain = nft_chain_lookup_byid(ctx->net, ctx->table, 9703 tb[NFTA_VERDICT_CHAIN_ID]); 9704 if (IS_ERR(chain)) 9705 return PTR_ERR(chain); 9706 } else { 9707 return -EINVAL; 9708 } 9709 9710 if (IS_ERR(chain)) 9711 return PTR_ERR(chain); 9712 if (nft_is_base_chain(chain)) 9713 return -EOPNOTSUPP; 9714 if (nft_chain_is_bound(chain)) 9715 return -EINVAL; 9716 if (desc->flags & NFT_DATA_DESC_SETELEM && 9717 chain->flags & NFT_CHAIN_BINDING) 9718 return -EINVAL; 9719 9720 chain->use++; 9721 data->verdict.chain = chain; 9722 break; 9723 } 9724 9725 desc->len = sizeof(data->verdict); 9726 9727 return 0; 9728 } 9729 9730 static void nft_verdict_uninit(const struct nft_data *data) 9731 { 9732 struct nft_chain *chain; 9733 struct nft_rule *rule; 9734 9735 switch (data->verdict.code) { 9736 case NFT_JUMP: 9737 case NFT_GOTO: 9738 chain = data->verdict.chain; 9739 chain->use--; 9740 9741 if (!nft_chain_is_bound(chain)) 9742 break; 9743 9744 chain->table->use--; 9745 list_for_each_entry(rule, &chain->rules, list) 9746 chain->use--; 9747 9748 nft_chain_del(chain); 9749 break; 9750 } 9751 } 9752 9753 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) 9754 { 9755 struct nlattr *nest; 9756 9757 nest = nla_nest_start_noflag(skb, type); 9758 if (!nest) 9759 goto nla_put_failure; 9760 9761 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) 9762 goto nla_put_failure; 9763 9764 switch (v->code) { 9765 case NFT_JUMP: 9766 case NFT_GOTO: 9767 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, 9768 v->chain->name)) 9769 goto nla_put_failure; 9770 } 9771 nla_nest_end(skb, nest); 9772 return 0; 9773 9774 nla_put_failure: 9775 return -1; 9776 } 9777 9778 static int nft_value_init(const struct nft_ctx *ctx, 9779 struct nft_data *data, struct nft_data_desc *desc, 9780 const struct nlattr *nla) 9781 { 9782 unsigned int len; 9783 9784 len = nla_len(nla); 9785 if (len == 0) 9786 return -EINVAL; 9787 if (len > desc->size) 9788 return -EOVERFLOW; 9789 if (desc->len) { 9790 if (len != desc->len) 9791 return -EINVAL; 9792 } else { 9793 desc->len = len; 9794 } 9795 9796 nla_memcpy(data->data, nla, len); 9797 9798 return 0; 9799 } 9800 9801 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, 9802 unsigned int len) 9803 { 9804 return nla_put(skb, NFTA_DATA_VALUE, len, data->data); 9805 } 9806 9807 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { 9808 [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, 9809 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, 9810 }; 9811 9812 /** 9813 * nft_data_init - parse nf_tables data netlink attributes 9814 * 9815 * @ctx: context of the expression using the data 9816 * @data: destination struct nft_data 9817 * @desc: data description 9818 * @nla: netlink attribute containing data 9819 * 9820 * Parse the netlink data attributes and initialize a struct nft_data. 9821 * The type and length of data are returned in the data description. 9822 * 9823 * The caller can indicate that it only wants to accept data of type 9824 * NFT_DATA_VALUE by passing NULL for the ctx argument. 9825 */ 9826 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, 9827 struct nft_data_desc *desc, const struct nlattr *nla) 9828 { 9829 struct nlattr *tb[NFTA_DATA_MAX + 1]; 9830 int err; 9831 9832 if (WARN_ON_ONCE(!desc->size)) 9833 return -EINVAL; 9834 9835 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla, 9836 nft_data_policy, NULL); 9837 if (err < 0) 9838 return err; 9839 9840 if (tb[NFTA_DATA_VALUE]) { 9841 if (desc->type != NFT_DATA_VALUE) 9842 return -EINVAL; 9843 9844 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); 9845 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) { 9846 if (desc->type != NFT_DATA_VERDICT) 9847 return -EINVAL; 9848 9849 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); 9850 } else { 9851 err = -EINVAL; 9852 } 9853 9854 return err; 9855 } 9856 EXPORT_SYMBOL_GPL(nft_data_init); 9857 9858 /** 9859 * nft_data_release - release a nft_data item 9860 * 9861 * @data: struct nft_data to release 9862 * @type: type of data 9863 * 9864 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, 9865 * all others need to be released by calling this function. 9866 */ 9867 void nft_data_release(const struct nft_data *data, enum nft_data_types type) 9868 { 9869 if (type < NFT_DATA_VERDICT) 9870 return; 9871 switch (type) { 9872 case NFT_DATA_VERDICT: 9873 return nft_verdict_uninit(data); 9874 default: 9875 WARN_ON(1); 9876 } 9877 } 9878 EXPORT_SYMBOL_GPL(nft_data_release); 9879 9880 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, 9881 enum nft_data_types type, unsigned int len) 9882 { 9883 struct nlattr *nest; 9884 int err; 9885 9886 nest = nla_nest_start_noflag(skb, attr); 9887 if (nest == NULL) 9888 return -1; 9889 9890 switch (type) { 9891 case NFT_DATA_VALUE: 9892 err = nft_value_dump(skb, data, len); 9893 break; 9894 case NFT_DATA_VERDICT: 9895 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); 9896 break; 9897 default: 9898 err = -EINVAL; 9899 WARN_ON(1); 9900 } 9901 9902 nla_nest_end(skb, nest); 9903 return err; 9904 } 9905 EXPORT_SYMBOL_GPL(nft_data_dump); 9906 9907 int __nft_release_basechain(struct nft_ctx *ctx) 9908 { 9909 struct nft_rule *rule, *nr; 9910 9911 if (WARN_ON(!nft_is_base_chain(ctx->chain))) 9912 return 0; 9913 9914 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain); 9915 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { 9916 list_del(&rule->list); 9917 ctx->chain->use--; 9918 nf_tables_rule_release(ctx, rule); 9919 } 9920 nft_chain_del(ctx->chain); 9921 ctx->table->use--; 9922 nf_tables_chain_destroy(ctx); 9923 9924 return 0; 9925 } 9926 EXPORT_SYMBOL_GPL(__nft_release_basechain); 9927 9928 static void __nft_release_hook(struct net *net, struct nft_table *table) 9929 { 9930 struct nft_flowtable *flowtable; 9931 struct nft_chain *chain; 9932 9933 list_for_each_entry(chain, &table->chains, list) 9934 __nf_tables_unregister_hook(net, table, chain, true); 9935 list_for_each_entry(flowtable, &table->flowtables, list) 9936 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list, 9937 true); 9938 } 9939 9940 static void __nft_release_hooks(struct net *net) 9941 { 9942 struct nftables_pernet *nft_net = nft_pernet(net); 9943 struct nft_table *table; 9944 9945 list_for_each_entry(table, &nft_net->tables, list) { 9946 if (nft_table_has_owner(table)) 9947 continue; 9948 9949 __nft_release_hook(net, table); 9950 } 9951 } 9952 9953 static void __nft_release_table(struct net *net, struct nft_table *table) 9954 { 9955 struct nft_flowtable *flowtable, *nf; 9956 struct nft_chain *chain, *nc; 9957 struct nft_object *obj, *ne; 9958 struct nft_rule *rule, *nr; 9959 struct nft_set *set, *ns; 9960 struct nft_ctx ctx = { 9961 .net = net, 9962 .family = NFPROTO_NETDEV, 9963 }; 9964 9965 ctx.family = table->family; 9966 ctx.table = table; 9967 list_for_each_entry(chain, &table->chains, list) { 9968 ctx.chain = chain; 9969 list_for_each_entry_safe(rule, nr, &chain->rules, list) { 9970 list_del(&rule->list); 9971 chain->use--; 9972 nf_tables_rule_release(&ctx, rule); 9973 } 9974 } 9975 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) { 9976 list_del(&flowtable->list); 9977 table->use--; 9978 nf_tables_flowtable_destroy(flowtable); 9979 } 9980 list_for_each_entry_safe(set, ns, &table->sets, list) { 9981 list_del(&set->list); 9982 table->use--; 9983 nft_set_destroy(&ctx, set); 9984 } 9985 list_for_each_entry_safe(obj, ne, &table->objects, list) { 9986 nft_obj_del(obj); 9987 table->use--; 9988 nft_obj_destroy(&ctx, obj); 9989 } 9990 list_for_each_entry_safe(chain, nc, &table->chains, list) { 9991 ctx.chain = chain; 9992 nft_chain_del(chain); 9993 table->use--; 9994 nf_tables_chain_destroy(&ctx); 9995 } 9996 nf_tables_table_destroy(&ctx); 9997 } 9998 9999 static void __nft_release_tables(struct net *net) 10000 { 10001 struct nftables_pernet *nft_net = nft_pernet(net); 10002 struct nft_table *table, *nt; 10003 10004 list_for_each_entry_safe(table, nt, &nft_net->tables, list) { 10005 if (nft_table_has_owner(table)) 10006 continue; 10007 10008 list_del(&table->list); 10009 10010 __nft_release_table(net, table); 10011 } 10012 } 10013 10014 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event, 10015 void *ptr) 10016 { 10017 struct nft_table *table, *to_delete[8]; 10018 struct nftables_pernet *nft_net; 10019 struct netlink_notify *n = ptr; 10020 struct net *net = n->net; 10021 unsigned int deleted; 10022 bool restart = false; 10023 10024 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER) 10025 return NOTIFY_DONE; 10026 10027 nft_net = nft_pernet(net); 10028 deleted = 0; 10029 mutex_lock(&nft_net->commit_mutex); 10030 again: 10031 list_for_each_entry(table, &nft_net->tables, list) { 10032 if (nft_table_has_owner(table) && 10033 n->portid == table->nlpid) { 10034 __nft_release_hook(net, table); 10035 list_del_rcu(&table->list); 10036 to_delete[deleted++] = table; 10037 if (deleted >= ARRAY_SIZE(to_delete)) 10038 break; 10039 } 10040 } 10041 if (deleted) { 10042 restart = deleted >= ARRAY_SIZE(to_delete); 10043 synchronize_rcu(); 10044 while (deleted) 10045 __nft_release_table(net, to_delete[--deleted]); 10046 10047 if (restart) 10048 goto again; 10049 } 10050 mutex_unlock(&nft_net->commit_mutex); 10051 10052 return NOTIFY_DONE; 10053 } 10054 10055 static struct notifier_block nft_nl_notifier = { 10056 .notifier_call = nft_rcv_nl_event, 10057 }; 10058 10059 static int __net_init nf_tables_init_net(struct net *net) 10060 { 10061 struct nftables_pernet *nft_net = nft_pernet(net); 10062 10063 INIT_LIST_HEAD(&nft_net->tables); 10064 INIT_LIST_HEAD(&nft_net->commit_list); 10065 INIT_LIST_HEAD(&nft_net->module_list); 10066 INIT_LIST_HEAD(&nft_net->notify_list); 10067 mutex_init(&nft_net->commit_mutex); 10068 nft_net->base_seq = 1; 10069 nft_net->validate_state = NFT_VALIDATE_SKIP; 10070 10071 return 0; 10072 } 10073 10074 static void __net_exit nf_tables_pre_exit_net(struct net *net) 10075 { 10076 struct nftables_pernet *nft_net = nft_pernet(net); 10077 10078 mutex_lock(&nft_net->commit_mutex); 10079 __nft_release_hooks(net); 10080 mutex_unlock(&nft_net->commit_mutex); 10081 } 10082 10083 static void __net_exit nf_tables_exit_net(struct net *net) 10084 { 10085 struct nftables_pernet *nft_net = nft_pernet(net); 10086 10087 mutex_lock(&nft_net->commit_mutex); 10088 if (!list_empty(&nft_net->commit_list)) 10089 __nf_tables_abort(net, NFNL_ABORT_NONE); 10090 __nft_release_tables(net); 10091 mutex_unlock(&nft_net->commit_mutex); 10092 WARN_ON_ONCE(!list_empty(&nft_net->tables)); 10093 WARN_ON_ONCE(!list_empty(&nft_net->module_list)); 10094 WARN_ON_ONCE(!list_empty(&nft_net->notify_list)); 10095 } 10096 10097 static struct pernet_operations nf_tables_net_ops = { 10098 .init = nf_tables_init_net, 10099 .pre_exit = nf_tables_pre_exit_net, 10100 .exit = nf_tables_exit_net, 10101 .id = &nf_tables_net_id, 10102 .size = sizeof(struct nftables_pernet), 10103 }; 10104 10105 static int __init nf_tables_module_init(void) 10106 { 10107 int err; 10108 10109 err = register_pernet_subsys(&nf_tables_net_ops); 10110 if (err < 0) 10111 return err; 10112 10113 err = nft_chain_filter_init(); 10114 if (err < 0) 10115 goto err_chain_filter; 10116 10117 err = nf_tables_core_module_init(); 10118 if (err < 0) 10119 goto err_core_module; 10120 10121 err = register_netdevice_notifier(&nf_tables_flowtable_notifier); 10122 if (err < 0) 10123 goto err_netdev_notifier; 10124 10125 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params); 10126 if (err < 0) 10127 goto err_rht_objname; 10128 10129 err = nft_offload_init(); 10130 if (err < 0) 10131 goto err_offload; 10132 10133 err = netlink_register_notifier(&nft_nl_notifier); 10134 if (err < 0) 10135 goto err_netlink_notifier; 10136 10137 /* must be last */ 10138 err = nfnetlink_subsys_register(&nf_tables_subsys); 10139 if (err < 0) 10140 goto err_nfnl_subsys; 10141 10142 nft_chain_route_init(); 10143 10144 return err; 10145 10146 err_nfnl_subsys: 10147 netlink_unregister_notifier(&nft_nl_notifier); 10148 err_netlink_notifier: 10149 nft_offload_exit(); 10150 err_offload: 10151 rhltable_destroy(&nft_objname_ht); 10152 err_rht_objname: 10153 unregister_netdevice_notifier(&nf_tables_flowtable_notifier); 10154 err_netdev_notifier: 10155 nf_tables_core_module_exit(); 10156 err_core_module: 10157 nft_chain_filter_fini(); 10158 err_chain_filter: 10159 unregister_pernet_subsys(&nf_tables_net_ops); 10160 return err; 10161 } 10162 10163 static void __exit nf_tables_module_exit(void) 10164 { 10165 nfnetlink_subsys_unregister(&nf_tables_subsys); 10166 netlink_unregister_notifier(&nft_nl_notifier); 10167 nft_offload_exit(); 10168 unregister_netdevice_notifier(&nf_tables_flowtable_notifier); 10169 nft_chain_filter_fini(); 10170 nft_chain_route_fini(); 10171 unregister_pernet_subsys(&nf_tables_net_ops); 10172 cancel_work_sync(&trans_destroy_work); 10173 rcu_barrier(); 10174 rhltable_destroy(&nft_objname_ht); 10175 nf_tables_core_module_exit(); 10176 } 10177 10178 module_init(nf_tables_module_init); 10179 module_exit(nf_tables_module_exit); 10180 10181 MODULE_LICENSE("GPL"); 10182 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 10183 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); 10184