| 1 | /* |
| 2 | * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
| 9 | */ |
| 10 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/list.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/netlink.h> |
| 16 | #include <linux/netfilter.h> |
| 17 | #include <linux/netfilter/nfnetlink.h> |
| 18 | #include <linux/netfilter/nf_tables.h> |
| 19 | #include <net/netfilter/nf_tables_core.h> |
| 20 | #include <net/netfilter/nf_tables.h> |
| 21 | #include <net/net_namespace.h> |
| 22 | #include <net/sock.h> |
| 23 | |
| 24 | static LIST_HEAD(nf_tables_expressions); |
| 25 | |
| 26 | /** |
| 27 | * nft_register_afinfo - register nf_tables address family info |
| 28 | * |
| 29 | * @afi: address family info to register |
| 30 | * |
| 31 | * Register the address family for use with nf_tables. Returns zero on |
| 32 | * success or a negative errno code otherwise. |
| 33 | */ |
| 34 | int nft_register_afinfo(struct net *net, struct nft_af_info *afi) |
| 35 | { |
| 36 | INIT_LIST_HEAD(&afi->tables); |
| 37 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 38 | list_add_tail_rcu(&afi->list, &net->nft.af_info); |
| 39 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 40 | return 0; |
| 41 | } |
| 42 | EXPORT_SYMBOL_GPL(nft_register_afinfo); |
| 43 | |
| 44 | /** |
| 45 | * nft_unregister_afinfo - unregister nf_tables address family info |
| 46 | * |
| 47 | * @afi: address family info to unregister |
| 48 | * |
| 49 | * Unregister the address family for use with nf_tables. |
| 50 | */ |
| 51 | void nft_unregister_afinfo(struct nft_af_info *afi) |
| 52 | { |
| 53 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 54 | list_del_rcu(&afi->list); |
| 55 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 56 | } |
| 57 | EXPORT_SYMBOL_GPL(nft_unregister_afinfo); |
| 58 | |
| 59 | static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family) |
| 60 | { |
| 61 | struct nft_af_info *afi; |
| 62 | |
| 63 | list_for_each_entry(afi, &net->nft.af_info, list) { |
| 64 | if (afi->family == family) |
| 65 | return afi; |
| 66 | } |
| 67 | return NULL; |
| 68 | } |
| 69 | |
| 70 | static struct nft_af_info * |
| 71 | nf_tables_afinfo_lookup(struct net *net, int family, bool autoload) |
| 72 | { |
| 73 | struct nft_af_info *afi; |
| 74 | |
| 75 | afi = nft_afinfo_lookup(net, family); |
| 76 | if (afi != NULL) |
| 77 | return afi; |
| 78 | #ifdef CONFIG_MODULES |
| 79 | if (autoload) { |
| 80 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 81 | request_module("nft-afinfo-%u", family); |
| 82 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 83 | afi = nft_afinfo_lookup(net, family); |
| 84 | if (afi != NULL) |
| 85 | return ERR_PTR(-EAGAIN); |
| 86 | } |
| 87 | #endif |
| 88 | return ERR_PTR(-EAFNOSUPPORT); |
| 89 | } |
| 90 | |
| 91 | static void nft_ctx_init(struct nft_ctx *ctx, |
| 92 | struct net *net, |
| 93 | const struct sk_buff *skb, |
| 94 | const struct nlmsghdr *nlh, |
| 95 | struct nft_af_info *afi, |
| 96 | struct nft_table *table, |
| 97 | struct nft_chain *chain, |
| 98 | const struct nlattr * const *nla) |
| 99 | { |
| 100 | ctx->net = net; |
| 101 | ctx->afi = afi; |
| 102 | ctx->table = table; |
| 103 | ctx->chain = chain; |
| 104 | ctx->nla = nla; |
| 105 | ctx->portid = NETLINK_CB(skb).portid; |
| 106 | ctx->report = nlmsg_report(nlh); |
| 107 | ctx->seq = nlh->nlmsg_seq; |
| 108 | } |
| 109 | |
| 110 | static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type, |
| 111 | u32 size) |
| 112 | { |
| 113 | struct nft_trans *trans; |
| 114 | |
| 115 | trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL); |
| 116 | if (trans == NULL) |
| 117 | return NULL; |
| 118 | |
| 119 | trans->msg_type = msg_type; |
| 120 | trans->ctx = *ctx; |
| 121 | |
| 122 | return trans; |
| 123 | } |
| 124 | |
| 125 | static void nft_trans_destroy(struct nft_trans *trans) |
| 126 | { |
| 127 | list_del(&trans->list); |
| 128 | kfree(trans); |
| 129 | } |
| 130 | |
| 131 | int nft_register_basechain(struct nft_base_chain *basechain, |
| 132 | unsigned int hook_nops) |
| 133 | { |
| 134 | struct net *net = read_pnet(&basechain->pnet); |
| 135 | |
| 136 | if (basechain->flags & NFT_BASECHAIN_DISABLED) |
| 137 | return 0; |
| 138 | |
| 139 | return nf_register_net_hooks(net, basechain->ops, hook_nops); |
| 140 | } |
| 141 | EXPORT_SYMBOL_GPL(nft_register_basechain); |
| 142 | |
| 143 | void nft_unregister_basechain(struct nft_base_chain *basechain, |
| 144 | unsigned int hook_nops) |
| 145 | { |
| 146 | struct net *net = read_pnet(&basechain->pnet); |
| 147 | |
| 148 | if (basechain->flags & NFT_BASECHAIN_DISABLED) |
| 149 | return; |
| 150 | |
| 151 | nf_unregister_net_hooks(net, basechain->ops, hook_nops); |
| 152 | } |
| 153 | EXPORT_SYMBOL_GPL(nft_unregister_basechain); |
| 154 | |
| 155 | static int nf_tables_register_hooks(const struct nft_table *table, |
| 156 | struct nft_chain *chain, |
| 157 | unsigned int hook_nops) |
| 158 | { |
| 159 | if (table->flags & NFT_TABLE_F_DORMANT || |
| 160 | !(chain->flags & NFT_BASE_CHAIN)) |
| 161 | return 0; |
| 162 | |
| 163 | return nft_register_basechain(nft_base_chain(chain), hook_nops); |
| 164 | } |
| 165 | |
| 166 | static void nf_tables_unregister_hooks(const struct nft_table *table, |
| 167 | struct nft_chain *chain, |
| 168 | unsigned int hook_nops) |
| 169 | { |
| 170 | if (table->flags & NFT_TABLE_F_DORMANT || |
| 171 | !(chain->flags & NFT_BASE_CHAIN)) |
| 172 | return; |
| 173 | |
| 174 | nft_unregister_basechain(nft_base_chain(chain), hook_nops); |
| 175 | } |
| 176 | |
| 177 | /* Internal table flags */ |
| 178 | #define NFT_TABLE_INACTIVE (1 << 15) |
| 179 | |
| 180 | static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) |
| 181 | { |
| 182 | struct nft_trans *trans; |
| 183 | |
| 184 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); |
| 185 | if (trans == NULL) |
| 186 | return -ENOMEM; |
| 187 | |
| 188 | if (msg_type == NFT_MSG_NEWTABLE) |
| 189 | ctx->table->flags |= NFT_TABLE_INACTIVE; |
| 190 | |
| 191 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | static int nft_deltable(struct nft_ctx *ctx) |
| 196 | { |
| 197 | int err; |
| 198 | |
| 199 | err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); |
| 200 | if (err < 0) |
| 201 | return err; |
| 202 | |
| 203 | list_del_rcu(&ctx->table->list); |
| 204 | return err; |
| 205 | } |
| 206 | |
| 207 | static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) |
| 208 | { |
| 209 | struct nft_trans *trans; |
| 210 | |
| 211 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); |
| 212 | if (trans == NULL) |
| 213 | return -ENOMEM; |
| 214 | |
| 215 | if (msg_type == NFT_MSG_NEWCHAIN) |
| 216 | ctx->chain->flags |= NFT_CHAIN_INACTIVE; |
| 217 | |
| 218 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | static int nft_delchain(struct nft_ctx *ctx) |
| 223 | { |
| 224 | int err; |
| 225 | |
| 226 | err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); |
| 227 | if (err < 0) |
| 228 | return err; |
| 229 | |
| 230 | ctx->table->use--; |
| 231 | list_del_rcu(&ctx->chain->list); |
| 232 | |
| 233 | return err; |
| 234 | } |
| 235 | |
| 236 | static inline bool |
| 237 | nft_rule_is_active(struct net *net, const struct nft_rule *rule) |
| 238 | { |
| 239 | return (rule->genmask & nft_genmask_cur(net)) == 0; |
| 240 | } |
| 241 | |
| 242 | static inline int |
| 243 | nft_rule_is_active_next(struct net *net, const struct nft_rule *rule) |
| 244 | { |
| 245 | return (rule->genmask & nft_genmask_next(net)) == 0; |
| 246 | } |
| 247 | |
| 248 | static inline void |
| 249 | nft_rule_activate_next(struct net *net, struct nft_rule *rule) |
| 250 | { |
| 251 | /* Now inactive, will be active in the future */ |
| 252 | rule->genmask = nft_genmask_cur(net); |
| 253 | } |
| 254 | |
| 255 | static inline void |
| 256 | nft_rule_deactivate_next(struct net *net, struct nft_rule *rule) |
| 257 | { |
| 258 | rule->genmask = nft_genmask_next(net); |
| 259 | } |
| 260 | |
| 261 | static inline void nft_rule_clear(struct net *net, struct nft_rule *rule) |
| 262 | { |
| 263 | rule->genmask &= ~nft_genmask_next(net); |
| 264 | } |
| 265 | |
| 266 | static int |
| 267 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) |
| 268 | { |
| 269 | /* You cannot delete the same rule twice */ |
| 270 | if (nft_rule_is_active_next(ctx->net, rule)) { |
| 271 | nft_rule_deactivate_next(ctx->net, rule); |
| 272 | ctx->chain->use--; |
| 273 | return 0; |
| 274 | } |
| 275 | return -ENOENT; |
| 276 | } |
| 277 | |
| 278 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, |
| 279 | struct nft_rule *rule) |
| 280 | { |
| 281 | struct nft_trans *trans; |
| 282 | |
| 283 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); |
| 284 | if (trans == NULL) |
| 285 | return NULL; |
| 286 | |
| 287 | nft_trans_rule(trans) = rule; |
| 288 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 289 | |
| 290 | return trans; |
| 291 | } |
| 292 | |
| 293 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) |
| 294 | { |
| 295 | struct nft_trans *trans; |
| 296 | int err; |
| 297 | |
| 298 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); |
| 299 | if (trans == NULL) |
| 300 | return -ENOMEM; |
| 301 | |
| 302 | err = nf_tables_delrule_deactivate(ctx, rule); |
| 303 | if (err < 0) { |
| 304 | nft_trans_destroy(trans); |
| 305 | return err; |
| 306 | } |
| 307 | |
| 308 | return 0; |
| 309 | } |
| 310 | |
| 311 | static int nft_delrule_by_chain(struct nft_ctx *ctx) |
| 312 | { |
| 313 | struct nft_rule *rule; |
| 314 | int err; |
| 315 | |
| 316 | list_for_each_entry(rule, &ctx->chain->rules, list) { |
| 317 | err = nft_delrule(ctx, rule); |
| 318 | if (err < 0) |
| 319 | return err; |
| 320 | } |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | /* Internal set flag */ |
| 325 | #define NFT_SET_INACTIVE (1 << 15) |
| 326 | |
| 327 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, |
| 328 | struct nft_set *set) |
| 329 | { |
| 330 | struct nft_trans *trans; |
| 331 | |
| 332 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); |
| 333 | if (trans == NULL) |
| 334 | return -ENOMEM; |
| 335 | |
| 336 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { |
| 337 | nft_trans_set_id(trans) = |
| 338 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); |
| 339 | set->flags |= NFT_SET_INACTIVE; |
| 340 | } |
| 341 | nft_trans_set(trans) = set; |
| 342 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 343 | |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | static int nft_delset(struct nft_ctx *ctx, struct nft_set *set) |
| 348 | { |
| 349 | int err; |
| 350 | |
| 351 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); |
| 352 | if (err < 0) |
| 353 | return err; |
| 354 | |
| 355 | list_del_rcu(&set->list); |
| 356 | ctx->table->use--; |
| 357 | |
| 358 | return err; |
| 359 | } |
| 360 | |
| 361 | /* |
| 362 | * Tables |
| 363 | */ |
| 364 | |
| 365 | static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, |
| 366 | const struct nlattr *nla) |
| 367 | { |
| 368 | struct nft_table *table; |
| 369 | |
| 370 | list_for_each_entry(table, &afi->tables, list) { |
| 371 | if (!nla_strcmp(nla, table->name)) |
| 372 | return table; |
| 373 | } |
| 374 | return NULL; |
| 375 | } |
| 376 | |
| 377 | static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, |
| 378 | const struct nlattr *nla) |
| 379 | { |
| 380 | struct nft_table *table; |
| 381 | |
| 382 | if (nla == NULL) |
| 383 | return ERR_PTR(-EINVAL); |
| 384 | |
| 385 | table = nft_table_lookup(afi, nla); |
| 386 | if (table != NULL) |
| 387 | return table; |
| 388 | |
| 389 | return ERR_PTR(-ENOENT); |
| 390 | } |
| 391 | |
| 392 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) |
| 393 | { |
| 394 | return ++table->hgenerator; |
| 395 | } |
| 396 | |
| 397 | static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX]; |
| 398 | |
| 399 | static const struct nf_chain_type * |
| 400 | __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
| 401 | { |
| 402 | int i; |
| 403 | |
| 404 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
| 405 | if (chain_type[family][i] != NULL && |
| 406 | !nla_strcmp(nla, chain_type[family][i]->name)) |
| 407 | return chain_type[family][i]; |
| 408 | } |
| 409 | return NULL; |
| 410 | } |
| 411 | |
| 412 | static const struct nf_chain_type * |
| 413 | nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
| 414 | const struct nlattr *nla, |
| 415 | bool autoload) |
| 416 | { |
| 417 | const struct nf_chain_type *type; |
| 418 | |
| 419 | type = __nf_tables_chain_type_lookup(afi->family, nla); |
| 420 | if (type != NULL) |
| 421 | return type; |
| 422 | #ifdef CONFIG_MODULES |
| 423 | if (autoload) { |
| 424 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 425 | request_module("nft-chain-%u-%.*s", afi->family, |
| 426 | nla_len(nla), (const char *)nla_data(nla)); |
| 427 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 428 | type = __nf_tables_chain_type_lookup(afi->family, nla); |
| 429 | if (type != NULL) |
| 430 | return ERR_PTR(-EAGAIN); |
| 431 | } |
| 432 | #endif |
| 433 | return ERR_PTR(-ENOENT); |
| 434 | } |
| 435 | |
| 436 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
| 437 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
| 438 | .len = NFT_TABLE_MAXNAMELEN - 1 }, |
| 439 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
| 440 | }; |
| 441 | |
| 442 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
| 443 | u32 portid, u32 seq, int event, u32 flags, |
| 444 | int family, const struct nft_table *table) |
| 445 | { |
| 446 | struct nlmsghdr *nlh; |
| 447 | struct nfgenmsg *nfmsg; |
| 448 | |
| 449 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 450 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
| 451 | if (nlh == NULL) |
| 452 | goto nla_put_failure; |
| 453 | |
| 454 | nfmsg = nlmsg_data(nlh); |
| 455 | nfmsg->nfgen_family = family; |
| 456 | nfmsg->version = NFNETLINK_V0; |
| 457 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
| 458 | |
| 459 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
| 460 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
| 461 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) |
| 462 | goto nla_put_failure; |
| 463 | |
| 464 | nlmsg_end(skb, nlh); |
| 465 | return 0; |
| 466 | |
| 467 | nla_put_failure: |
| 468 | nlmsg_trim(skb, nlh); |
| 469 | return -1; |
| 470 | } |
| 471 | |
| 472 | static int nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
| 473 | { |
| 474 | struct sk_buff *skb; |
| 475 | int err; |
| 476 | |
| 477 | if (!ctx->report && |
| 478 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
| 479 | return 0; |
| 480 | |
| 481 | err = -ENOBUFS; |
| 482 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 483 | if (skb == NULL) |
| 484 | goto err; |
| 485 | |
| 486 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
| 487 | event, 0, ctx->afi->family, ctx->table); |
| 488 | if (err < 0) { |
| 489 | kfree_skb(skb); |
| 490 | goto err; |
| 491 | } |
| 492 | |
| 493 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 494 | ctx->report, GFP_KERNEL); |
| 495 | err: |
| 496 | if (err < 0) { |
| 497 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 498 | err); |
| 499 | } |
| 500 | return err; |
| 501 | } |
| 502 | |
| 503 | static int nf_tables_dump_tables(struct sk_buff *skb, |
| 504 | struct netlink_callback *cb) |
| 505 | { |
| 506 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
| 507 | const struct nft_af_info *afi; |
| 508 | const struct nft_table *table; |
| 509 | unsigned int idx = 0, s_idx = cb->args[0]; |
| 510 | struct net *net = sock_net(skb->sk); |
| 511 | int family = nfmsg->nfgen_family; |
| 512 | |
| 513 | rcu_read_lock(); |
| 514 | cb->seq = net->nft.base_seq; |
| 515 | |
| 516 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
| 517 | if (family != NFPROTO_UNSPEC && family != afi->family) |
| 518 | continue; |
| 519 | |
| 520 | list_for_each_entry_rcu(table, &afi->tables, list) { |
| 521 | if (idx < s_idx) |
| 522 | goto cont; |
| 523 | if (idx > s_idx) |
| 524 | memset(&cb->args[1], 0, |
| 525 | sizeof(cb->args) - sizeof(cb->args[0])); |
| 526 | if (nf_tables_fill_table_info(skb, net, |
| 527 | NETLINK_CB(cb->skb).portid, |
| 528 | cb->nlh->nlmsg_seq, |
| 529 | NFT_MSG_NEWTABLE, |
| 530 | NLM_F_MULTI, |
| 531 | afi->family, table) < 0) |
| 532 | goto done; |
| 533 | |
| 534 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
| 535 | cont: |
| 536 | idx++; |
| 537 | } |
| 538 | } |
| 539 | done: |
| 540 | rcu_read_unlock(); |
| 541 | cb->args[0] = idx; |
| 542 | return skb->len; |
| 543 | } |
| 544 | |
| 545 | static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb, |
| 546 | const struct nlmsghdr *nlh, |
| 547 | const struct nlattr * const nla[]) |
| 548 | { |
| 549 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 550 | const struct nft_af_info *afi; |
| 551 | const struct nft_table *table; |
| 552 | struct sk_buff *skb2; |
| 553 | struct net *net = sock_net(skb->sk); |
| 554 | int family = nfmsg->nfgen_family; |
| 555 | int err; |
| 556 | |
| 557 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 558 | struct netlink_dump_control c = { |
| 559 | .dump = nf_tables_dump_tables, |
| 560 | }; |
| 561 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 562 | } |
| 563 | |
| 564 | afi = nf_tables_afinfo_lookup(net, family, false); |
| 565 | if (IS_ERR(afi)) |
| 566 | return PTR_ERR(afi); |
| 567 | |
| 568 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
| 569 | if (IS_ERR(table)) |
| 570 | return PTR_ERR(table); |
| 571 | if (table->flags & NFT_TABLE_INACTIVE) |
| 572 | return -ENOENT; |
| 573 | |
| 574 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 575 | if (!skb2) |
| 576 | return -ENOMEM; |
| 577 | |
| 578 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
| 579 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
| 580 | family, table); |
| 581 | if (err < 0) |
| 582 | goto err; |
| 583 | |
| 584 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 585 | |
| 586 | err: |
| 587 | kfree_skb(skb2); |
| 588 | return err; |
| 589 | } |
| 590 | |
| 591 | static int nf_tables_table_enable(const struct nft_af_info *afi, |
| 592 | struct nft_table *table) |
| 593 | { |
| 594 | struct nft_chain *chain; |
| 595 | int err, i = 0; |
| 596 | |
| 597 | list_for_each_entry(chain, &table->chains, list) { |
| 598 | if (!(chain->flags & NFT_BASE_CHAIN)) |
| 599 | continue; |
| 600 | |
| 601 | err = nft_register_basechain(nft_base_chain(chain), afi->nops); |
| 602 | if (err < 0) |
| 603 | goto err; |
| 604 | |
| 605 | i++; |
| 606 | } |
| 607 | return 0; |
| 608 | err: |
| 609 | list_for_each_entry(chain, &table->chains, list) { |
| 610 | if (!(chain->flags & NFT_BASE_CHAIN)) |
| 611 | continue; |
| 612 | |
| 613 | if (i-- <= 0) |
| 614 | break; |
| 615 | |
| 616 | nft_unregister_basechain(nft_base_chain(chain), afi->nops); |
| 617 | } |
| 618 | return err; |
| 619 | } |
| 620 | |
| 621 | static void nf_tables_table_disable(const struct nft_af_info *afi, |
| 622 | struct nft_table *table) |
| 623 | { |
| 624 | struct nft_chain *chain; |
| 625 | |
| 626 | list_for_each_entry(chain, &table->chains, list) { |
| 627 | if (chain->flags & NFT_BASE_CHAIN) |
| 628 | nft_unregister_basechain(nft_base_chain(chain), |
| 629 | afi->nops); |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | static int nf_tables_updtable(struct nft_ctx *ctx) |
| 634 | { |
| 635 | struct nft_trans *trans; |
| 636 | u32 flags; |
| 637 | int ret = 0; |
| 638 | |
| 639 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
| 640 | return 0; |
| 641 | |
| 642 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
| 643 | if (flags & ~NFT_TABLE_F_DORMANT) |
| 644 | return -EINVAL; |
| 645 | |
| 646 | if (flags == ctx->table->flags) |
| 647 | return 0; |
| 648 | |
| 649 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
| 650 | sizeof(struct nft_trans_table)); |
| 651 | if (trans == NULL) |
| 652 | return -ENOMEM; |
| 653 | |
| 654 | if ((flags & NFT_TABLE_F_DORMANT) && |
| 655 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { |
| 656 | nft_trans_table_enable(trans) = false; |
| 657 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
| 658 | ctx->table->flags & NFT_TABLE_F_DORMANT) { |
| 659 | ret = nf_tables_table_enable(ctx->afi, ctx->table); |
| 660 | if (ret >= 0) { |
| 661 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
| 662 | nft_trans_table_enable(trans) = true; |
| 663 | } |
| 664 | } |
| 665 | if (ret < 0) |
| 666 | goto err; |
| 667 | |
| 668 | nft_trans_table_update(trans) = true; |
| 669 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 670 | return 0; |
| 671 | err: |
| 672 | nft_trans_destroy(trans); |
| 673 | return ret; |
| 674 | } |
| 675 | |
| 676 | static int nf_tables_newtable(struct net *net, struct sock *nlsk, |
| 677 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 678 | const struct nlattr * const nla[]) |
| 679 | { |
| 680 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 681 | const struct nlattr *name; |
| 682 | struct nft_af_info *afi; |
| 683 | struct nft_table *table; |
| 684 | int family = nfmsg->nfgen_family; |
| 685 | u32 flags = 0; |
| 686 | struct nft_ctx ctx; |
| 687 | int err; |
| 688 | |
| 689 | afi = nf_tables_afinfo_lookup(net, family, true); |
| 690 | if (IS_ERR(afi)) |
| 691 | return PTR_ERR(afi); |
| 692 | |
| 693 | name = nla[NFTA_TABLE_NAME]; |
| 694 | table = nf_tables_table_lookup(afi, name); |
| 695 | if (IS_ERR(table)) { |
| 696 | if (PTR_ERR(table) != -ENOENT) |
| 697 | return PTR_ERR(table); |
| 698 | table = NULL; |
| 699 | } |
| 700 | |
| 701 | if (table != NULL) { |
| 702 | if (table->flags & NFT_TABLE_INACTIVE) |
| 703 | return -ENOENT; |
| 704 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 705 | return -EEXIST; |
| 706 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 707 | return -EOPNOTSUPP; |
| 708 | |
| 709 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
| 710 | return nf_tables_updtable(&ctx); |
| 711 | } |
| 712 | |
| 713 | if (nla[NFTA_TABLE_FLAGS]) { |
| 714 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); |
| 715 | if (flags & ~NFT_TABLE_F_DORMANT) |
| 716 | return -EINVAL; |
| 717 | } |
| 718 | |
| 719 | err = -EAFNOSUPPORT; |
| 720 | if (!try_module_get(afi->owner)) |
| 721 | goto err1; |
| 722 | |
| 723 | err = -ENOMEM; |
| 724 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
| 725 | if (table == NULL) |
| 726 | goto err2; |
| 727 | |
| 728 | nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN); |
| 729 | INIT_LIST_HEAD(&table->chains); |
| 730 | INIT_LIST_HEAD(&table->sets); |
| 731 | table->flags = flags; |
| 732 | |
| 733 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
| 734 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
| 735 | if (err < 0) |
| 736 | goto err3; |
| 737 | |
| 738 | list_add_tail_rcu(&table->list, &afi->tables); |
| 739 | return 0; |
| 740 | err3: |
| 741 | kfree(table); |
| 742 | err2: |
| 743 | module_put(afi->owner); |
| 744 | err1: |
| 745 | return err; |
| 746 | } |
| 747 | |
| 748 | static int nft_flush_table(struct nft_ctx *ctx) |
| 749 | { |
| 750 | int err; |
| 751 | struct nft_chain *chain, *nc; |
| 752 | struct nft_set *set, *ns; |
| 753 | |
| 754 | list_for_each_entry(chain, &ctx->table->chains, list) { |
| 755 | ctx->chain = chain; |
| 756 | |
| 757 | err = nft_delrule_by_chain(ctx); |
| 758 | if (err < 0) |
| 759 | goto out; |
| 760 | } |
| 761 | |
| 762 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { |
| 763 | if (set->flags & NFT_SET_ANONYMOUS && |
| 764 | !list_empty(&set->bindings)) |
| 765 | continue; |
| 766 | |
| 767 | err = nft_delset(ctx, set); |
| 768 | if (err < 0) |
| 769 | goto out; |
| 770 | } |
| 771 | |
| 772 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
| 773 | ctx->chain = chain; |
| 774 | |
| 775 | err = nft_delchain(ctx); |
| 776 | if (err < 0) |
| 777 | goto out; |
| 778 | } |
| 779 | |
| 780 | err = nft_deltable(ctx); |
| 781 | out: |
| 782 | return err; |
| 783 | } |
| 784 | |
| 785 | static int nft_flush(struct nft_ctx *ctx, int family) |
| 786 | { |
| 787 | struct nft_af_info *afi; |
| 788 | struct nft_table *table, *nt; |
| 789 | const struct nlattr * const *nla = ctx->nla; |
| 790 | int err = 0; |
| 791 | |
| 792 | list_for_each_entry(afi, &ctx->net->nft.af_info, list) { |
| 793 | if (family != AF_UNSPEC && afi->family != family) |
| 794 | continue; |
| 795 | |
| 796 | ctx->afi = afi; |
| 797 | list_for_each_entry_safe(table, nt, &afi->tables, list) { |
| 798 | if (nla[NFTA_TABLE_NAME] && |
| 799 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) |
| 800 | continue; |
| 801 | |
| 802 | ctx->table = table; |
| 803 | |
| 804 | err = nft_flush_table(ctx); |
| 805 | if (err < 0) |
| 806 | goto out; |
| 807 | } |
| 808 | } |
| 809 | out: |
| 810 | return err; |
| 811 | } |
| 812 | |
| 813 | static int nf_tables_deltable(struct net *net, struct sock *nlsk, |
| 814 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 815 | const struct nlattr * const nla[]) |
| 816 | { |
| 817 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 818 | struct nft_af_info *afi; |
| 819 | struct nft_table *table; |
| 820 | int family = nfmsg->nfgen_family; |
| 821 | struct nft_ctx ctx; |
| 822 | |
| 823 | nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla); |
| 824 | if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL) |
| 825 | return nft_flush(&ctx, family); |
| 826 | |
| 827 | afi = nf_tables_afinfo_lookup(net, family, false); |
| 828 | if (IS_ERR(afi)) |
| 829 | return PTR_ERR(afi); |
| 830 | |
| 831 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
| 832 | if (IS_ERR(table)) |
| 833 | return PTR_ERR(table); |
| 834 | if (table->flags & NFT_TABLE_INACTIVE) |
| 835 | return -ENOENT; |
| 836 | |
| 837 | ctx.afi = afi; |
| 838 | ctx.table = table; |
| 839 | |
| 840 | return nft_flush_table(&ctx); |
| 841 | } |
| 842 | |
| 843 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
| 844 | { |
| 845 | BUG_ON(ctx->table->use > 0); |
| 846 | |
| 847 | kfree(ctx->table); |
| 848 | module_put(ctx->afi->owner); |
| 849 | } |
| 850 | |
| 851 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
| 852 | { |
| 853 | int err = 0; |
| 854 | |
| 855 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 856 | if (chain_type[ctype->family][ctype->type] != NULL) { |
| 857 | err = -EBUSY; |
| 858 | goto out; |
| 859 | } |
| 860 | chain_type[ctype->family][ctype->type] = ctype; |
| 861 | out: |
| 862 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 863 | return err; |
| 864 | } |
| 865 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
| 866 | |
| 867 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
| 868 | { |
| 869 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 870 | chain_type[ctype->family][ctype->type] = NULL; |
| 871 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 872 | } |
| 873 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
| 874 | |
| 875 | /* |
| 876 | * Chains |
| 877 | */ |
| 878 | |
| 879 | static struct nft_chain * |
| 880 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) |
| 881 | { |
| 882 | struct nft_chain *chain; |
| 883 | |
| 884 | list_for_each_entry(chain, &table->chains, list) { |
| 885 | if (chain->handle == handle) |
| 886 | return chain; |
| 887 | } |
| 888 | |
| 889 | return ERR_PTR(-ENOENT); |
| 890 | } |
| 891 | |
| 892 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, |
| 893 | const struct nlattr *nla) |
| 894 | { |
| 895 | struct nft_chain *chain; |
| 896 | |
| 897 | if (nla == NULL) |
| 898 | return ERR_PTR(-EINVAL); |
| 899 | |
| 900 | list_for_each_entry(chain, &table->chains, list) { |
| 901 | if (!nla_strcmp(nla, chain->name)) |
| 902 | return chain; |
| 903 | } |
| 904 | |
| 905 | return ERR_PTR(-ENOENT); |
| 906 | } |
| 907 | |
| 908 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { |
| 909 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, |
| 910 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
| 911 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, |
| 912 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, |
| 913 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, |
| 914 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
| 915 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
| 916 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
| 917 | }; |
| 918 | |
| 919 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { |
| 920 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, |
| 921 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, |
| 922 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
| 923 | .len = IFNAMSIZ - 1 }, |
| 924 | }; |
| 925 | |
| 926 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
| 927 | { |
| 928 | struct nft_stats *cpu_stats, total; |
| 929 | struct nlattr *nest; |
| 930 | unsigned int seq; |
| 931 | u64 pkts, bytes; |
| 932 | int cpu; |
| 933 | |
| 934 | memset(&total, 0, sizeof(total)); |
| 935 | for_each_possible_cpu(cpu) { |
| 936 | cpu_stats = per_cpu_ptr(stats, cpu); |
| 937 | do { |
| 938 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); |
| 939 | pkts = cpu_stats->pkts; |
| 940 | bytes = cpu_stats->bytes; |
| 941 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); |
| 942 | total.pkts += pkts; |
| 943 | total.bytes += bytes; |
| 944 | } |
| 945 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); |
| 946 | if (nest == NULL) |
| 947 | goto nla_put_failure; |
| 948 | |
| 949 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) || |
| 950 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes))) |
| 951 | goto nla_put_failure; |
| 952 | |
| 953 | nla_nest_end(skb, nest); |
| 954 | return 0; |
| 955 | |
| 956 | nla_put_failure: |
| 957 | return -ENOSPC; |
| 958 | } |
| 959 | |
| 960 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
| 961 | u32 portid, u32 seq, int event, u32 flags, |
| 962 | int family, const struct nft_table *table, |
| 963 | const struct nft_chain *chain) |
| 964 | { |
| 965 | struct nlmsghdr *nlh; |
| 966 | struct nfgenmsg *nfmsg; |
| 967 | |
| 968 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 969 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
| 970 | if (nlh == NULL) |
| 971 | goto nla_put_failure; |
| 972 | |
| 973 | nfmsg = nlmsg_data(nlh); |
| 974 | nfmsg->nfgen_family = family; |
| 975 | nfmsg->version = NFNETLINK_V0; |
| 976 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
| 977 | |
| 978 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) |
| 979 | goto nla_put_failure; |
| 980 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle))) |
| 981 | goto nla_put_failure; |
| 982 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) |
| 983 | goto nla_put_failure; |
| 984 | |
| 985 | if (chain->flags & NFT_BASE_CHAIN) { |
| 986 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
| 987 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
| 988 | struct nlattr *nest; |
| 989 | |
| 990 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); |
| 991 | if (nest == NULL) |
| 992 | goto nla_put_failure; |
| 993 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) |
| 994 | goto nla_put_failure; |
| 995 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) |
| 996 | goto nla_put_failure; |
| 997 | if (basechain->dev_name[0] && |
| 998 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) |
| 999 | goto nla_put_failure; |
| 1000 | nla_nest_end(skb, nest); |
| 1001 | |
| 1002 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
| 1003 | htonl(basechain->policy))) |
| 1004 | goto nla_put_failure; |
| 1005 | |
| 1006 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
| 1007 | goto nla_put_failure; |
| 1008 | |
| 1009 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) |
| 1010 | goto nla_put_failure; |
| 1011 | } |
| 1012 | |
| 1013 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
| 1014 | goto nla_put_failure; |
| 1015 | |
| 1016 | nlmsg_end(skb, nlh); |
| 1017 | return 0; |
| 1018 | |
| 1019 | nla_put_failure: |
| 1020 | nlmsg_trim(skb, nlh); |
| 1021 | return -1; |
| 1022 | } |
| 1023 | |
| 1024 | static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
| 1025 | { |
| 1026 | struct sk_buff *skb; |
| 1027 | int err; |
| 1028 | |
| 1029 | if (!ctx->report && |
| 1030 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
| 1031 | return 0; |
| 1032 | |
| 1033 | err = -ENOBUFS; |
| 1034 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1035 | if (skb == NULL) |
| 1036 | goto err; |
| 1037 | |
| 1038 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
| 1039 | event, 0, ctx->afi->family, ctx->table, |
| 1040 | ctx->chain); |
| 1041 | if (err < 0) { |
| 1042 | kfree_skb(skb); |
| 1043 | goto err; |
| 1044 | } |
| 1045 | |
| 1046 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1047 | ctx->report, GFP_KERNEL); |
| 1048 | err: |
| 1049 | if (err < 0) { |
| 1050 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1051 | err); |
| 1052 | } |
| 1053 | return err; |
| 1054 | } |
| 1055 | |
| 1056 | static int nf_tables_dump_chains(struct sk_buff *skb, |
| 1057 | struct netlink_callback *cb) |
| 1058 | { |
| 1059 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
| 1060 | const struct nft_af_info *afi; |
| 1061 | const struct nft_table *table; |
| 1062 | const struct nft_chain *chain; |
| 1063 | unsigned int idx = 0, s_idx = cb->args[0]; |
| 1064 | struct net *net = sock_net(skb->sk); |
| 1065 | int family = nfmsg->nfgen_family; |
| 1066 | |
| 1067 | rcu_read_lock(); |
| 1068 | cb->seq = net->nft.base_seq; |
| 1069 | |
| 1070 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
| 1071 | if (family != NFPROTO_UNSPEC && family != afi->family) |
| 1072 | continue; |
| 1073 | |
| 1074 | list_for_each_entry_rcu(table, &afi->tables, list) { |
| 1075 | list_for_each_entry_rcu(chain, &table->chains, list) { |
| 1076 | if (idx < s_idx) |
| 1077 | goto cont; |
| 1078 | if (idx > s_idx) |
| 1079 | memset(&cb->args[1], 0, |
| 1080 | sizeof(cb->args) - sizeof(cb->args[0])); |
| 1081 | if (nf_tables_fill_chain_info(skb, net, |
| 1082 | NETLINK_CB(cb->skb).portid, |
| 1083 | cb->nlh->nlmsg_seq, |
| 1084 | NFT_MSG_NEWCHAIN, |
| 1085 | NLM_F_MULTI, |
| 1086 | afi->family, table, chain) < 0) |
| 1087 | goto done; |
| 1088 | |
| 1089 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
| 1090 | cont: |
| 1091 | idx++; |
| 1092 | } |
| 1093 | } |
| 1094 | } |
| 1095 | done: |
| 1096 | rcu_read_unlock(); |
| 1097 | cb->args[0] = idx; |
| 1098 | return skb->len; |
| 1099 | } |
| 1100 | |
| 1101 | static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb, |
| 1102 | const struct nlmsghdr *nlh, |
| 1103 | const struct nlattr * const nla[]) |
| 1104 | { |
| 1105 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 1106 | const struct nft_af_info *afi; |
| 1107 | const struct nft_table *table; |
| 1108 | const struct nft_chain *chain; |
| 1109 | struct sk_buff *skb2; |
| 1110 | struct net *net = sock_net(skb->sk); |
| 1111 | int family = nfmsg->nfgen_family; |
| 1112 | int err; |
| 1113 | |
| 1114 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 1115 | struct netlink_dump_control c = { |
| 1116 | .dump = nf_tables_dump_chains, |
| 1117 | }; |
| 1118 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 1119 | } |
| 1120 | |
| 1121 | afi = nf_tables_afinfo_lookup(net, family, false); |
| 1122 | if (IS_ERR(afi)) |
| 1123 | return PTR_ERR(afi); |
| 1124 | |
| 1125 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
| 1126 | if (IS_ERR(table)) |
| 1127 | return PTR_ERR(table); |
| 1128 | if (table->flags & NFT_TABLE_INACTIVE) |
| 1129 | return -ENOENT; |
| 1130 | |
| 1131 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); |
| 1132 | if (IS_ERR(chain)) |
| 1133 | return PTR_ERR(chain); |
| 1134 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1135 | return -ENOENT; |
| 1136 | |
| 1137 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1138 | if (!skb2) |
| 1139 | return -ENOMEM; |
| 1140 | |
| 1141 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
| 1142 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
| 1143 | family, table, chain); |
| 1144 | if (err < 0) |
| 1145 | goto err; |
| 1146 | |
| 1147 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 1148 | |
| 1149 | err: |
| 1150 | kfree_skb(skb2); |
| 1151 | return err; |
| 1152 | } |
| 1153 | |
| 1154 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
| 1155 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, |
| 1156 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, |
| 1157 | }; |
| 1158 | |
| 1159 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
| 1160 | { |
| 1161 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; |
| 1162 | struct nft_stats __percpu *newstats; |
| 1163 | struct nft_stats *stats; |
| 1164 | int err; |
| 1165 | |
| 1166 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); |
| 1167 | if (err < 0) |
| 1168 | return ERR_PTR(err); |
| 1169 | |
| 1170 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) |
| 1171 | return ERR_PTR(-EINVAL); |
| 1172 | |
| 1173 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
| 1174 | if (newstats == NULL) |
| 1175 | return ERR_PTR(-ENOMEM); |
| 1176 | |
| 1177 | /* Restore old counters on this cpu, no problem. Per-cpu statistics |
| 1178 | * are not exposed to userspace. |
| 1179 | */ |
| 1180 | preempt_disable(); |
| 1181 | stats = this_cpu_ptr(newstats); |
| 1182 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); |
| 1183 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); |
| 1184 | preempt_enable(); |
| 1185 | |
| 1186 | return newstats; |
| 1187 | } |
| 1188 | |
| 1189 | static void nft_chain_stats_replace(struct nft_base_chain *chain, |
| 1190 | struct nft_stats __percpu *newstats) |
| 1191 | { |
| 1192 | if (newstats == NULL) |
| 1193 | return; |
| 1194 | |
| 1195 | if (chain->stats) { |
| 1196 | struct nft_stats __percpu *oldstats = |
| 1197 | nft_dereference(chain->stats); |
| 1198 | |
| 1199 | rcu_assign_pointer(chain->stats, newstats); |
| 1200 | synchronize_rcu(); |
| 1201 | free_percpu(oldstats); |
| 1202 | } else |
| 1203 | rcu_assign_pointer(chain->stats, newstats); |
| 1204 | } |
| 1205 | |
| 1206 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
| 1207 | { |
| 1208 | BUG_ON(chain->use > 0); |
| 1209 | |
| 1210 | if (chain->flags & NFT_BASE_CHAIN) { |
| 1211 | struct nft_base_chain *basechain = nft_base_chain(chain); |
| 1212 | |
| 1213 | module_put(basechain->type->owner); |
| 1214 | free_percpu(basechain->stats); |
| 1215 | if (basechain->ops[0].dev != NULL) |
| 1216 | dev_put(basechain->ops[0].dev); |
| 1217 | kfree(basechain); |
| 1218 | } else { |
| 1219 | kfree(chain); |
| 1220 | } |
| 1221 | } |
| 1222 | |
| 1223 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
| 1224 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 1225 | const struct nlattr * const nla[]) |
| 1226 | { |
| 1227 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 1228 | const struct nlattr * uninitialized_var(name); |
| 1229 | struct nft_af_info *afi; |
| 1230 | struct nft_table *table; |
| 1231 | struct nft_chain *chain; |
| 1232 | struct nft_base_chain *basechain = NULL; |
| 1233 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
| 1234 | int family = nfmsg->nfgen_family; |
| 1235 | struct net_device *dev = NULL; |
| 1236 | u8 policy = NF_ACCEPT; |
| 1237 | u64 handle = 0; |
| 1238 | unsigned int i; |
| 1239 | struct nft_stats __percpu *stats; |
| 1240 | int err; |
| 1241 | bool create; |
| 1242 | struct nft_ctx ctx; |
| 1243 | |
| 1244 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| 1245 | |
| 1246 | afi = nf_tables_afinfo_lookup(net, family, true); |
| 1247 | if (IS_ERR(afi)) |
| 1248 | return PTR_ERR(afi); |
| 1249 | |
| 1250 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
| 1251 | if (IS_ERR(table)) |
| 1252 | return PTR_ERR(table); |
| 1253 | |
| 1254 | chain = NULL; |
| 1255 | name = nla[NFTA_CHAIN_NAME]; |
| 1256 | |
| 1257 | if (nla[NFTA_CHAIN_HANDLE]) { |
| 1258 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); |
| 1259 | chain = nf_tables_chain_lookup_byhandle(table, handle); |
| 1260 | if (IS_ERR(chain)) |
| 1261 | return PTR_ERR(chain); |
| 1262 | } else { |
| 1263 | chain = nf_tables_chain_lookup(table, name); |
| 1264 | if (IS_ERR(chain)) { |
| 1265 | if (PTR_ERR(chain) != -ENOENT) |
| 1266 | return PTR_ERR(chain); |
| 1267 | chain = NULL; |
| 1268 | } |
| 1269 | } |
| 1270 | |
| 1271 | if (nla[NFTA_CHAIN_POLICY]) { |
| 1272 | if ((chain != NULL && |
| 1273 | !(chain->flags & NFT_BASE_CHAIN))) |
| 1274 | return -EOPNOTSUPP; |
| 1275 | |
| 1276 | if (chain == NULL && |
| 1277 | nla[NFTA_CHAIN_HOOK] == NULL) |
| 1278 | return -EOPNOTSUPP; |
| 1279 | |
| 1280 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
| 1281 | switch (policy) { |
| 1282 | case NF_DROP: |
| 1283 | case NF_ACCEPT: |
| 1284 | break; |
| 1285 | default: |
| 1286 | return -EINVAL; |
| 1287 | } |
| 1288 | } |
| 1289 | |
| 1290 | if (chain != NULL) { |
| 1291 | struct nft_stats *stats = NULL; |
| 1292 | struct nft_trans *trans; |
| 1293 | |
| 1294 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1295 | return -ENOENT; |
| 1296 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 1297 | return -EEXIST; |
| 1298 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 1299 | return -EOPNOTSUPP; |
| 1300 | |
| 1301 | if (nla[NFTA_CHAIN_HANDLE] && name && |
| 1302 | !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) |
| 1303 | return -EEXIST; |
| 1304 | |
| 1305 | if (nla[NFTA_CHAIN_COUNTERS]) { |
| 1306 | if (!(chain->flags & NFT_BASE_CHAIN)) |
| 1307 | return -EOPNOTSUPP; |
| 1308 | |
| 1309 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
| 1310 | if (IS_ERR(stats)) |
| 1311 | return PTR_ERR(stats); |
| 1312 | } |
| 1313 | |
| 1314 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
| 1315 | trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN, |
| 1316 | sizeof(struct nft_trans_chain)); |
| 1317 | if (trans == NULL) { |
| 1318 | free_percpu(stats); |
| 1319 | return -ENOMEM; |
| 1320 | } |
| 1321 | |
| 1322 | nft_trans_chain_stats(trans) = stats; |
| 1323 | nft_trans_chain_update(trans) = true; |
| 1324 | |
| 1325 | if (nla[NFTA_CHAIN_POLICY]) |
| 1326 | nft_trans_chain_policy(trans) = policy; |
| 1327 | else |
| 1328 | nft_trans_chain_policy(trans) = -1; |
| 1329 | |
| 1330 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
| 1331 | nla_strlcpy(nft_trans_chain_name(trans), name, |
| 1332 | NFT_CHAIN_MAXNAMELEN); |
| 1333 | } |
| 1334 | list_add_tail(&trans->list, &net->nft.commit_list); |
| 1335 | return 0; |
| 1336 | } |
| 1337 | |
| 1338 | if (table->use == UINT_MAX) |
| 1339 | return -EOVERFLOW; |
| 1340 | |
| 1341 | if (nla[NFTA_CHAIN_HOOK]) { |
| 1342 | const struct nf_chain_type *type; |
| 1343 | struct nf_hook_ops *ops; |
| 1344 | nf_hookfn *hookfn; |
| 1345 | u32 hooknum, priority; |
| 1346 | |
| 1347 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
| 1348 | if (nla[NFTA_CHAIN_TYPE]) { |
| 1349 | type = nf_tables_chain_type_lookup(afi, |
| 1350 | nla[NFTA_CHAIN_TYPE], |
| 1351 | create); |
| 1352 | if (IS_ERR(type)) |
| 1353 | return PTR_ERR(type); |
| 1354 | } |
| 1355 | |
| 1356 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], |
| 1357 | nft_hook_policy); |
| 1358 | if (err < 0) |
| 1359 | return err; |
| 1360 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || |
| 1361 | ha[NFTA_HOOK_PRIORITY] == NULL) |
| 1362 | return -EINVAL; |
| 1363 | |
| 1364 | hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); |
| 1365 | if (hooknum >= afi->nhooks) |
| 1366 | return -EINVAL; |
| 1367 | priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
| 1368 | |
| 1369 | if (!(type->hook_mask & (1 << hooknum))) |
| 1370 | return -EOPNOTSUPP; |
| 1371 | if (!try_module_get(type->owner)) |
| 1372 | return -ENOENT; |
| 1373 | hookfn = type->hooks[hooknum]; |
| 1374 | |
| 1375 | if (afi->flags & NFT_AF_NEEDS_DEV) { |
| 1376 | char ifname[IFNAMSIZ]; |
| 1377 | |
| 1378 | if (!ha[NFTA_HOOK_DEV]) { |
| 1379 | module_put(type->owner); |
| 1380 | return -EOPNOTSUPP; |
| 1381 | } |
| 1382 | |
| 1383 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); |
| 1384 | dev = dev_get_by_name(net, ifname); |
| 1385 | if (!dev) { |
| 1386 | module_put(type->owner); |
| 1387 | return -ENOENT; |
| 1388 | } |
| 1389 | } else if (ha[NFTA_HOOK_DEV]) { |
| 1390 | module_put(type->owner); |
| 1391 | return -EOPNOTSUPP; |
| 1392 | } |
| 1393 | |
| 1394 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
| 1395 | if (basechain == NULL) { |
| 1396 | module_put(type->owner); |
| 1397 | if (dev != NULL) |
| 1398 | dev_put(dev); |
| 1399 | return -ENOMEM; |
| 1400 | } |
| 1401 | |
| 1402 | if (dev != NULL) |
| 1403 | strncpy(basechain->dev_name, dev->name, IFNAMSIZ); |
| 1404 | |
| 1405 | if (nla[NFTA_CHAIN_COUNTERS]) { |
| 1406 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
| 1407 | if (IS_ERR(stats)) { |
| 1408 | module_put(type->owner); |
| 1409 | kfree(basechain); |
| 1410 | if (dev != NULL) |
| 1411 | dev_put(dev); |
| 1412 | return PTR_ERR(stats); |
| 1413 | } |
| 1414 | basechain->stats = stats; |
| 1415 | } else { |
| 1416 | stats = netdev_alloc_pcpu_stats(struct nft_stats); |
| 1417 | if (stats == NULL) { |
| 1418 | module_put(type->owner); |
| 1419 | kfree(basechain); |
| 1420 | if (dev != NULL) |
| 1421 | dev_put(dev); |
| 1422 | return -ENOMEM; |
| 1423 | } |
| 1424 | rcu_assign_pointer(basechain->stats, stats); |
| 1425 | } |
| 1426 | |
| 1427 | write_pnet(&basechain->pnet, net); |
| 1428 | basechain->type = type; |
| 1429 | chain = &basechain->chain; |
| 1430 | |
| 1431 | for (i = 0; i < afi->nops; i++) { |
| 1432 | ops = &basechain->ops[i]; |
| 1433 | ops->pf = family; |
| 1434 | ops->hooknum = hooknum; |
| 1435 | ops->priority = priority; |
| 1436 | ops->priv = chain; |
| 1437 | ops->hook = afi->hooks[ops->hooknum]; |
| 1438 | ops->dev = dev; |
| 1439 | if (hookfn) |
| 1440 | ops->hook = hookfn; |
| 1441 | if (afi->hook_ops_init) |
| 1442 | afi->hook_ops_init(ops, i); |
| 1443 | } |
| 1444 | |
| 1445 | chain->flags |= NFT_BASE_CHAIN; |
| 1446 | basechain->policy = policy; |
| 1447 | } else { |
| 1448 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); |
| 1449 | if (chain == NULL) |
| 1450 | return -ENOMEM; |
| 1451 | } |
| 1452 | |
| 1453 | INIT_LIST_HEAD(&chain->rules); |
| 1454 | chain->handle = nf_tables_alloc_handle(table); |
| 1455 | chain->table = table; |
| 1456 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
| 1457 | |
| 1458 | err = nf_tables_register_hooks(table, chain, afi->nops); |
| 1459 | if (err < 0) |
| 1460 | goto err1; |
| 1461 | |
| 1462 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
| 1463 | err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN); |
| 1464 | if (err < 0) |
| 1465 | goto err2; |
| 1466 | |
| 1467 | table->use++; |
| 1468 | list_add_tail_rcu(&chain->list, &table->chains); |
| 1469 | return 0; |
| 1470 | err2: |
| 1471 | nf_tables_unregister_hooks(table, chain, afi->nops); |
| 1472 | err1: |
| 1473 | nf_tables_chain_destroy(chain); |
| 1474 | return err; |
| 1475 | } |
| 1476 | |
| 1477 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
| 1478 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 1479 | const struct nlattr * const nla[]) |
| 1480 | { |
| 1481 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 1482 | struct nft_af_info *afi; |
| 1483 | struct nft_table *table; |
| 1484 | struct nft_chain *chain; |
| 1485 | int family = nfmsg->nfgen_family; |
| 1486 | struct nft_ctx ctx; |
| 1487 | |
| 1488 | afi = nf_tables_afinfo_lookup(net, family, false); |
| 1489 | if (IS_ERR(afi)) |
| 1490 | return PTR_ERR(afi); |
| 1491 | |
| 1492 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
| 1493 | if (IS_ERR(table)) |
| 1494 | return PTR_ERR(table); |
| 1495 | if (table->flags & NFT_TABLE_INACTIVE) |
| 1496 | return -ENOENT; |
| 1497 | |
| 1498 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); |
| 1499 | if (IS_ERR(chain)) |
| 1500 | return PTR_ERR(chain); |
| 1501 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1502 | return -ENOENT; |
| 1503 | if (chain->use > 0) |
| 1504 | return -EBUSY; |
| 1505 | |
| 1506 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
| 1507 | |
| 1508 | return nft_delchain(&ctx); |
| 1509 | } |
| 1510 | |
| 1511 | /* |
| 1512 | * Expressions |
| 1513 | */ |
| 1514 | |
| 1515 | /** |
| 1516 | * nft_register_expr - register nf_tables expr type |
| 1517 | * @ops: expr type |
| 1518 | * |
| 1519 | * Registers the expr type for use with nf_tables. Returns zero on |
| 1520 | * success or a negative errno code otherwise. |
| 1521 | */ |
| 1522 | int nft_register_expr(struct nft_expr_type *type) |
| 1523 | { |
| 1524 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 1525 | if (type->family == NFPROTO_UNSPEC) |
| 1526 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
| 1527 | else |
| 1528 | list_add_rcu(&type->list, &nf_tables_expressions); |
| 1529 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 1530 | return 0; |
| 1531 | } |
| 1532 | EXPORT_SYMBOL_GPL(nft_register_expr); |
| 1533 | |
| 1534 | /** |
| 1535 | * nft_unregister_expr - unregister nf_tables expr type |
| 1536 | * @ops: expr type |
| 1537 | * |
| 1538 | * Unregisters the expr typefor use with nf_tables. |
| 1539 | */ |
| 1540 | void nft_unregister_expr(struct nft_expr_type *type) |
| 1541 | { |
| 1542 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 1543 | list_del_rcu(&type->list); |
| 1544 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 1545 | } |
| 1546 | EXPORT_SYMBOL_GPL(nft_unregister_expr); |
| 1547 | |
| 1548 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
| 1549 | struct nlattr *nla) |
| 1550 | { |
| 1551 | const struct nft_expr_type *type; |
| 1552 | |
| 1553 | list_for_each_entry(type, &nf_tables_expressions, list) { |
| 1554 | if (!nla_strcmp(nla, type->name) && |
| 1555 | (!type->family || type->family == family)) |
| 1556 | return type; |
| 1557 | } |
| 1558 | return NULL; |
| 1559 | } |
| 1560 | |
| 1561 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
| 1562 | struct nlattr *nla) |
| 1563 | { |
| 1564 | const struct nft_expr_type *type; |
| 1565 | |
| 1566 | if (nla == NULL) |
| 1567 | return ERR_PTR(-EINVAL); |
| 1568 | |
| 1569 | type = __nft_expr_type_get(family, nla); |
| 1570 | if (type != NULL && try_module_get(type->owner)) |
| 1571 | return type; |
| 1572 | |
| 1573 | #ifdef CONFIG_MODULES |
| 1574 | if (type == NULL) { |
| 1575 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 1576 | request_module("nft-expr-%u-%.*s", family, |
| 1577 | nla_len(nla), (char *)nla_data(nla)); |
| 1578 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 1579 | if (__nft_expr_type_get(family, nla)) |
| 1580 | return ERR_PTR(-EAGAIN); |
| 1581 | |
| 1582 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 1583 | request_module("nft-expr-%.*s", |
| 1584 | nla_len(nla), (char *)nla_data(nla)); |
| 1585 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 1586 | if (__nft_expr_type_get(family, nla)) |
| 1587 | return ERR_PTR(-EAGAIN); |
| 1588 | } |
| 1589 | #endif |
| 1590 | return ERR_PTR(-ENOENT); |
| 1591 | } |
| 1592 | |
| 1593 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { |
| 1594 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, |
| 1595 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, |
| 1596 | }; |
| 1597 | |
| 1598 | static int nf_tables_fill_expr_info(struct sk_buff *skb, |
| 1599 | const struct nft_expr *expr) |
| 1600 | { |
| 1601 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
| 1602 | goto nla_put_failure; |
| 1603 | |
| 1604 | if (expr->ops->dump) { |
| 1605 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); |
| 1606 | if (data == NULL) |
| 1607 | goto nla_put_failure; |
| 1608 | if (expr->ops->dump(skb, expr) < 0) |
| 1609 | goto nla_put_failure; |
| 1610 | nla_nest_end(skb, data); |
| 1611 | } |
| 1612 | |
| 1613 | return skb->len; |
| 1614 | |
| 1615 | nla_put_failure: |
| 1616 | return -1; |
| 1617 | }; |
| 1618 | |
| 1619 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
| 1620 | const struct nft_expr *expr) |
| 1621 | { |
| 1622 | struct nlattr *nest; |
| 1623 | |
| 1624 | nest = nla_nest_start(skb, attr); |
| 1625 | if (!nest) |
| 1626 | goto nla_put_failure; |
| 1627 | if (nf_tables_fill_expr_info(skb, expr) < 0) |
| 1628 | goto nla_put_failure; |
| 1629 | nla_nest_end(skb, nest); |
| 1630 | return 0; |
| 1631 | |
| 1632 | nla_put_failure: |
| 1633 | return -1; |
| 1634 | } |
| 1635 | |
| 1636 | struct nft_expr_info { |
| 1637 | const struct nft_expr_ops *ops; |
| 1638 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
| 1639 | }; |
| 1640 | |
| 1641 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
| 1642 | const struct nlattr *nla, |
| 1643 | struct nft_expr_info *info) |
| 1644 | { |
| 1645 | const struct nft_expr_type *type; |
| 1646 | const struct nft_expr_ops *ops; |
| 1647 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
| 1648 | int err; |
| 1649 | |
| 1650 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
| 1651 | if (err < 0) |
| 1652 | return err; |
| 1653 | |
| 1654 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
| 1655 | if (IS_ERR(type)) |
| 1656 | return PTR_ERR(type); |
| 1657 | |
| 1658 | if (tb[NFTA_EXPR_DATA]) { |
| 1659 | err = nla_parse_nested(info->tb, type->maxattr, |
| 1660 | tb[NFTA_EXPR_DATA], type->policy); |
| 1661 | if (err < 0) |
| 1662 | goto err1; |
| 1663 | } else |
| 1664 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); |
| 1665 | |
| 1666 | if (type->select_ops != NULL) { |
| 1667 | ops = type->select_ops(ctx, |
| 1668 | (const struct nlattr * const *)info->tb); |
| 1669 | if (IS_ERR(ops)) { |
| 1670 | err = PTR_ERR(ops); |
| 1671 | goto err1; |
| 1672 | } |
| 1673 | } else |
| 1674 | ops = type->ops; |
| 1675 | |
| 1676 | info->ops = ops; |
| 1677 | return 0; |
| 1678 | |
| 1679 | err1: |
| 1680 | module_put(type->owner); |
| 1681 | return err; |
| 1682 | } |
| 1683 | |
| 1684 | static int nf_tables_newexpr(const struct nft_ctx *ctx, |
| 1685 | const struct nft_expr_info *info, |
| 1686 | struct nft_expr *expr) |
| 1687 | { |
| 1688 | const struct nft_expr_ops *ops = info->ops; |
| 1689 | int err; |
| 1690 | |
| 1691 | expr->ops = ops; |
| 1692 | if (ops->init) { |
| 1693 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
| 1694 | if (err < 0) |
| 1695 | goto err1; |
| 1696 | } |
| 1697 | |
| 1698 | return 0; |
| 1699 | |
| 1700 | err1: |
| 1701 | expr->ops = NULL; |
| 1702 | return err; |
| 1703 | } |
| 1704 | |
| 1705 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
| 1706 | struct nft_expr *expr) |
| 1707 | { |
| 1708 | if (expr->ops->destroy) |
| 1709 | expr->ops->destroy(ctx, expr); |
| 1710 | module_put(expr->ops->type->owner); |
| 1711 | } |
| 1712 | |
| 1713 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
| 1714 | const struct nlattr *nla) |
| 1715 | { |
| 1716 | struct nft_expr_info info; |
| 1717 | struct nft_expr *expr; |
| 1718 | int err; |
| 1719 | |
| 1720 | err = nf_tables_expr_parse(ctx, nla, &info); |
| 1721 | if (err < 0) |
| 1722 | goto err1; |
| 1723 | |
| 1724 | err = -ENOMEM; |
| 1725 | expr = kzalloc(info.ops->size, GFP_KERNEL); |
| 1726 | if (expr == NULL) |
| 1727 | goto err2; |
| 1728 | |
| 1729 | err = nf_tables_newexpr(ctx, &info, expr); |
| 1730 | if (err < 0) |
| 1731 | goto err2; |
| 1732 | |
| 1733 | return expr; |
| 1734 | err2: |
| 1735 | module_put(info.ops->type->owner); |
| 1736 | err1: |
| 1737 | return ERR_PTR(err); |
| 1738 | } |
| 1739 | |
| 1740 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) |
| 1741 | { |
| 1742 | nf_tables_expr_destroy(ctx, expr); |
| 1743 | kfree(expr); |
| 1744 | } |
| 1745 | |
| 1746 | /* |
| 1747 | * Rules |
| 1748 | */ |
| 1749 | |
| 1750 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, |
| 1751 | u64 handle) |
| 1752 | { |
| 1753 | struct nft_rule *rule; |
| 1754 | |
| 1755 | // FIXME: this sucks |
| 1756 | list_for_each_entry(rule, &chain->rules, list) { |
| 1757 | if (handle == rule->handle) |
| 1758 | return rule; |
| 1759 | } |
| 1760 | |
| 1761 | return ERR_PTR(-ENOENT); |
| 1762 | } |
| 1763 | |
| 1764 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, |
| 1765 | const struct nlattr *nla) |
| 1766 | { |
| 1767 | if (nla == NULL) |
| 1768 | return ERR_PTR(-EINVAL); |
| 1769 | |
| 1770 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); |
| 1771 | } |
| 1772 | |
| 1773 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { |
| 1774 | [NFTA_RULE_TABLE] = { .type = NLA_STRING }, |
| 1775 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
| 1776 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, |
| 1777 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, |
| 1778 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, |
| 1779 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
| 1780 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
| 1781 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
| 1782 | .len = NFT_USERDATA_MAXLEN }, |
| 1783 | }; |
| 1784 | |
| 1785 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
| 1786 | u32 portid, u32 seq, int event, |
| 1787 | u32 flags, int family, |
| 1788 | const struct nft_table *table, |
| 1789 | const struct nft_chain *chain, |
| 1790 | const struct nft_rule *rule) |
| 1791 | { |
| 1792 | struct nlmsghdr *nlh; |
| 1793 | struct nfgenmsg *nfmsg; |
| 1794 | const struct nft_expr *expr, *next; |
| 1795 | struct nlattr *list; |
| 1796 | const struct nft_rule *prule; |
| 1797 | int type = event | NFNL_SUBSYS_NFTABLES << 8; |
| 1798 | |
| 1799 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
| 1800 | flags); |
| 1801 | if (nlh == NULL) |
| 1802 | goto nla_put_failure; |
| 1803 | |
| 1804 | nfmsg = nlmsg_data(nlh); |
| 1805 | nfmsg->nfgen_family = family; |
| 1806 | nfmsg->version = NFNETLINK_V0; |
| 1807 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
| 1808 | |
| 1809 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) |
| 1810 | goto nla_put_failure; |
| 1811 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) |
| 1812 | goto nla_put_failure; |
| 1813 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle))) |
| 1814 | goto nla_put_failure; |
| 1815 | |
| 1816 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
| 1817 | prule = list_entry(rule->list.prev, struct nft_rule, list); |
| 1818 | if (nla_put_be64(skb, NFTA_RULE_POSITION, |
| 1819 | cpu_to_be64(prule->handle))) |
| 1820 | goto nla_put_failure; |
| 1821 | } |
| 1822 | |
| 1823 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
| 1824 | if (list == NULL) |
| 1825 | goto nla_put_failure; |
| 1826 | nft_rule_for_each_expr(expr, next, rule) { |
| 1827 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
| 1828 | goto nla_put_failure; |
| 1829 | } |
| 1830 | nla_nest_end(skb, list); |
| 1831 | |
| 1832 | if (rule->udata) { |
| 1833 | struct nft_userdata *udata = nft_userdata(rule); |
| 1834 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, |
| 1835 | udata->data) < 0) |
| 1836 | goto nla_put_failure; |
| 1837 | } |
| 1838 | |
| 1839 | nlmsg_end(skb, nlh); |
| 1840 | return 0; |
| 1841 | |
| 1842 | nla_put_failure: |
| 1843 | nlmsg_trim(skb, nlh); |
| 1844 | return -1; |
| 1845 | } |
| 1846 | |
| 1847 | static int nf_tables_rule_notify(const struct nft_ctx *ctx, |
| 1848 | const struct nft_rule *rule, |
| 1849 | int event) |
| 1850 | { |
| 1851 | struct sk_buff *skb; |
| 1852 | int err; |
| 1853 | |
| 1854 | if (!ctx->report && |
| 1855 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
| 1856 | return 0; |
| 1857 | |
| 1858 | err = -ENOBUFS; |
| 1859 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1860 | if (skb == NULL) |
| 1861 | goto err; |
| 1862 | |
| 1863 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
| 1864 | event, 0, ctx->afi->family, ctx->table, |
| 1865 | ctx->chain, rule); |
| 1866 | if (err < 0) { |
| 1867 | kfree_skb(skb); |
| 1868 | goto err; |
| 1869 | } |
| 1870 | |
| 1871 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1872 | ctx->report, GFP_KERNEL); |
| 1873 | err: |
| 1874 | if (err < 0) { |
| 1875 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1876 | err); |
| 1877 | } |
| 1878 | return err; |
| 1879 | } |
| 1880 | |
| 1881 | static int nf_tables_dump_rules(struct sk_buff *skb, |
| 1882 | struct netlink_callback *cb) |
| 1883 | { |
| 1884 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
| 1885 | const struct nft_af_info *afi; |
| 1886 | const struct nft_table *table; |
| 1887 | const struct nft_chain *chain; |
| 1888 | const struct nft_rule *rule; |
| 1889 | unsigned int idx = 0, s_idx = cb->args[0]; |
| 1890 | struct net *net = sock_net(skb->sk); |
| 1891 | int family = nfmsg->nfgen_family; |
| 1892 | |
| 1893 | rcu_read_lock(); |
| 1894 | cb->seq = net->nft.base_seq; |
| 1895 | |
| 1896 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
| 1897 | if (family != NFPROTO_UNSPEC && family != afi->family) |
| 1898 | continue; |
| 1899 | |
| 1900 | list_for_each_entry_rcu(table, &afi->tables, list) { |
| 1901 | list_for_each_entry_rcu(chain, &table->chains, list) { |
| 1902 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
| 1903 | if (!nft_rule_is_active(net, rule)) |
| 1904 | goto cont; |
| 1905 | if (idx < s_idx) |
| 1906 | goto cont; |
| 1907 | if (idx > s_idx) |
| 1908 | memset(&cb->args[1], 0, |
| 1909 | sizeof(cb->args) - sizeof(cb->args[0])); |
| 1910 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, |
| 1911 | cb->nlh->nlmsg_seq, |
| 1912 | NFT_MSG_NEWRULE, |
| 1913 | NLM_F_MULTI | NLM_F_APPEND, |
| 1914 | afi->family, table, chain, rule) < 0) |
| 1915 | goto done; |
| 1916 | |
| 1917 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
| 1918 | cont: |
| 1919 | idx++; |
| 1920 | } |
| 1921 | } |
| 1922 | } |
| 1923 | } |
| 1924 | done: |
| 1925 | rcu_read_unlock(); |
| 1926 | |
| 1927 | cb->args[0] = idx; |
| 1928 | return skb->len; |
| 1929 | } |
| 1930 | |
| 1931 | static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb, |
| 1932 | const struct nlmsghdr *nlh, |
| 1933 | const struct nlattr * const nla[]) |
| 1934 | { |
| 1935 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 1936 | const struct nft_af_info *afi; |
| 1937 | const struct nft_table *table; |
| 1938 | const struct nft_chain *chain; |
| 1939 | const struct nft_rule *rule; |
| 1940 | struct sk_buff *skb2; |
| 1941 | struct net *net = sock_net(skb->sk); |
| 1942 | int family = nfmsg->nfgen_family; |
| 1943 | int err; |
| 1944 | |
| 1945 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 1946 | struct netlink_dump_control c = { |
| 1947 | .dump = nf_tables_dump_rules, |
| 1948 | }; |
| 1949 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 1950 | } |
| 1951 | |
| 1952 | afi = nf_tables_afinfo_lookup(net, family, false); |
| 1953 | if (IS_ERR(afi)) |
| 1954 | return PTR_ERR(afi); |
| 1955 | |
| 1956 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
| 1957 | if (IS_ERR(table)) |
| 1958 | return PTR_ERR(table); |
| 1959 | if (table->flags & NFT_TABLE_INACTIVE) |
| 1960 | return -ENOENT; |
| 1961 | |
| 1962 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| 1963 | if (IS_ERR(chain)) |
| 1964 | return PTR_ERR(chain); |
| 1965 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1966 | return -ENOENT; |
| 1967 | |
| 1968 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); |
| 1969 | if (IS_ERR(rule)) |
| 1970 | return PTR_ERR(rule); |
| 1971 | |
| 1972 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1973 | if (!skb2) |
| 1974 | return -ENOMEM; |
| 1975 | |
| 1976 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
| 1977 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
| 1978 | family, table, chain, rule); |
| 1979 | if (err < 0) |
| 1980 | goto err; |
| 1981 | |
| 1982 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 1983 | |
| 1984 | err: |
| 1985 | kfree_skb(skb2); |
| 1986 | return err; |
| 1987 | } |
| 1988 | |
| 1989 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
| 1990 | struct nft_rule *rule) |
| 1991 | { |
| 1992 | struct nft_expr *expr; |
| 1993 | |
| 1994 | /* |
| 1995 | * Careful: some expressions might not be initialized in case this |
| 1996 | * is called on error from nf_tables_newrule(). |
| 1997 | */ |
| 1998 | expr = nft_expr_first(rule); |
| 1999 | while (expr != nft_expr_last(rule) && expr->ops) { |
| 2000 | nf_tables_expr_destroy(ctx, expr); |
| 2001 | expr = nft_expr_next(expr); |
| 2002 | } |
| 2003 | kfree(rule); |
| 2004 | } |
| 2005 | |
| 2006 | #define NFT_RULE_MAXEXPRS 128 |
| 2007 | |
| 2008 | static struct nft_expr_info *info; |
| 2009 | |
| 2010 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
| 2011 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 2012 | const struct nlattr * const nla[]) |
| 2013 | { |
| 2014 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 2015 | struct nft_af_info *afi; |
| 2016 | struct nft_table *table; |
| 2017 | struct nft_chain *chain; |
| 2018 | struct nft_rule *rule, *old_rule = NULL; |
| 2019 | struct nft_userdata *udata; |
| 2020 | struct nft_trans *trans = NULL; |
| 2021 | struct nft_expr *expr; |
| 2022 | struct nft_ctx ctx; |
| 2023 | struct nlattr *tmp; |
| 2024 | unsigned int size, i, n, ulen = 0, usize = 0; |
| 2025 | int err, rem; |
| 2026 | bool create; |
| 2027 | u64 handle, pos_handle; |
| 2028 | |
| 2029 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| 2030 | |
| 2031 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
| 2032 | if (IS_ERR(afi)) |
| 2033 | return PTR_ERR(afi); |
| 2034 | |
| 2035 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
| 2036 | if (IS_ERR(table)) |
| 2037 | return PTR_ERR(table); |
| 2038 | |
| 2039 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| 2040 | if (IS_ERR(chain)) |
| 2041 | return PTR_ERR(chain); |
| 2042 | |
| 2043 | if (nla[NFTA_RULE_HANDLE]) { |
| 2044 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); |
| 2045 | rule = __nf_tables_rule_lookup(chain, handle); |
| 2046 | if (IS_ERR(rule)) |
| 2047 | return PTR_ERR(rule); |
| 2048 | |
| 2049 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 2050 | return -EEXIST; |
| 2051 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 2052 | old_rule = rule; |
| 2053 | else |
| 2054 | return -EOPNOTSUPP; |
| 2055 | } else { |
| 2056 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) |
| 2057 | return -EINVAL; |
| 2058 | handle = nf_tables_alloc_handle(table); |
| 2059 | |
| 2060 | if (chain->use == UINT_MAX) |
| 2061 | return -EOVERFLOW; |
| 2062 | } |
| 2063 | |
| 2064 | if (nla[NFTA_RULE_POSITION]) { |
| 2065 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) |
| 2066 | return -EOPNOTSUPP; |
| 2067 | |
| 2068 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); |
| 2069 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); |
| 2070 | if (IS_ERR(old_rule)) |
| 2071 | return PTR_ERR(old_rule); |
| 2072 | } |
| 2073 | |
| 2074 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
| 2075 | |
| 2076 | n = 0; |
| 2077 | size = 0; |
| 2078 | if (nla[NFTA_RULE_EXPRESSIONS]) { |
| 2079 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { |
| 2080 | err = -EINVAL; |
| 2081 | if (nla_type(tmp) != NFTA_LIST_ELEM) |
| 2082 | goto err1; |
| 2083 | if (n == NFT_RULE_MAXEXPRS) |
| 2084 | goto err1; |
| 2085 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
| 2086 | if (err < 0) |
| 2087 | goto err1; |
| 2088 | size += info[n].ops->size; |
| 2089 | n++; |
| 2090 | } |
| 2091 | } |
| 2092 | /* Check for overflow of dlen field */ |
| 2093 | err = -EFBIG; |
| 2094 | if (size >= 1 << 12) |
| 2095 | goto err1; |
| 2096 | |
| 2097 | if (nla[NFTA_RULE_USERDATA]) { |
| 2098 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
| 2099 | if (ulen > 0) |
| 2100 | usize = sizeof(struct nft_userdata) + ulen; |
| 2101 | } |
| 2102 | |
| 2103 | err = -ENOMEM; |
| 2104 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
| 2105 | if (rule == NULL) |
| 2106 | goto err1; |
| 2107 | |
| 2108 | nft_rule_activate_next(net, rule); |
| 2109 | |
| 2110 | rule->handle = handle; |
| 2111 | rule->dlen = size; |
| 2112 | rule->udata = ulen ? 1 : 0; |
| 2113 | |
| 2114 | if (ulen) { |
| 2115 | udata = nft_userdata(rule); |
| 2116 | udata->len = ulen - 1; |
| 2117 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); |
| 2118 | } |
| 2119 | |
| 2120 | expr = nft_expr_first(rule); |
| 2121 | for (i = 0; i < n; i++) { |
| 2122 | err = nf_tables_newexpr(&ctx, &info[i], expr); |
| 2123 | if (err < 0) |
| 2124 | goto err2; |
| 2125 | info[i].ops = NULL; |
| 2126 | expr = nft_expr_next(expr); |
| 2127 | } |
| 2128 | |
| 2129 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
| 2130 | if (nft_rule_is_active_next(net, old_rule)) { |
| 2131 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
| 2132 | old_rule); |
| 2133 | if (trans == NULL) { |
| 2134 | err = -ENOMEM; |
| 2135 | goto err2; |
| 2136 | } |
| 2137 | nft_rule_deactivate_next(net, old_rule); |
| 2138 | chain->use--; |
| 2139 | list_add_tail_rcu(&rule->list, &old_rule->list); |
| 2140 | } else { |
| 2141 | err = -ENOENT; |
| 2142 | goto err2; |
| 2143 | } |
| 2144 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
| 2145 | if (old_rule) |
| 2146 | list_add_rcu(&rule->list, &old_rule->list); |
| 2147 | else |
| 2148 | list_add_tail_rcu(&rule->list, &chain->rules); |
| 2149 | else { |
| 2150 | if (old_rule) |
| 2151 | list_add_tail_rcu(&rule->list, &old_rule->list); |
| 2152 | else |
| 2153 | list_add_rcu(&rule->list, &chain->rules); |
| 2154 | } |
| 2155 | |
| 2156 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
| 2157 | err = -ENOMEM; |
| 2158 | goto err3; |
| 2159 | } |
| 2160 | chain->use++; |
| 2161 | return 0; |
| 2162 | |
| 2163 | err3: |
| 2164 | list_del_rcu(&rule->list); |
| 2165 | err2: |
| 2166 | nf_tables_rule_destroy(&ctx, rule); |
| 2167 | err1: |
| 2168 | for (i = 0; i < n; i++) { |
| 2169 | if (info[i].ops != NULL) |
| 2170 | module_put(info[i].ops->type->owner); |
| 2171 | } |
| 2172 | return err; |
| 2173 | } |
| 2174 | |
| 2175 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
| 2176 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 2177 | const struct nlattr * const nla[]) |
| 2178 | { |
| 2179 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 2180 | struct nft_af_info *afi; |
| 2181 | struct nft_table *table; |
| 2182 | struct nft_chain *chain = NULL; |
| 2183 | struct nft_rule *rule; |
| 2184 | int family = nfmsg->nfgen_family, err = 0; |
| 2185 | struct nft_ctx ctx; |
| 2186 | |
| 2187 | afi = nf_tables_afinfo_lookup(net, family, false); |
| 2188 | if (IS_ERR(afi)) |
| 2189 | return PTR_ERR(afi); |
| 2190 | |
| 2191 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
| 2192 | if (IS_ERR(table)) |
| 2193 | return PTR_ERR(table); |
| 2194 | if (table->flags & NFT_TABLE_INACTIVE) |
| 2195 | return -ENOENT; |
| 2196 | |
| 2197 | if (nla[NFTA_RULE_CHAIN]) { |
| 2198 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| 2199 | if (IS_ERR(chain)) |
| 2200 | return PTR_ERR(chain); |
| 2201 | } |
| 2202 | |
| 2203 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
| 2204 | |
| 2205 | if (chain) { |
| 2206 | if (nla[NFTA_RULE_HANDLE]) { |
| 2207 | rule = nf_tables_rule_lookup(chain, |
| 2208 | nla[NFTA_RULE_HANDLE]); |
| 2209 | if (IS_ERR(rule)) |
| 2210 | return PTR_ERR(rule); |
| 2211 | |
| 2212 | err = nft_delrule(&ctx, rule); |
| 2213 | } else { |
| 2214 | err = nft_delrule_by_chain(&ctx); |
| 2215 | } |
| 2216 | } else { |
| 2217 | list_for_each_entry(chain, &table->chains, list) { |
| 2218 | ctx.chain = chain; |
| 2219 | err = nft_delrule_by_chain(&ctx); |
| 2220 | if (err < 0) |
| 2221 | break; |
| 2222 | } |
| 2223 | } |
| 2224 | |
| 2225 | return err; |
| 2226 | } |
| 2227 | |
| 2228 | /* |
| 2229 | * Sets |
| 2230 | */ |
| 2231 | |
| 2232 | static LIST_HEAD(nf_tables_set_ops); |
| 2233 | |
| 2234 | int nft_register_set(struct nft_set_ops *ops) |
| 2235 | { |
| 2236 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 2237 | list_add_tail_rcu(&ops->list, &nf_tables_set_ops); |
| 2238 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 2239 | return 0; |
| 2240 | } |
| 2241 | EXPORT_SYMBOL_GPL(nft_register_set); |
| 2242 | |
| 2243 | void nft_unregister_set(struct nft_set_ops *ops) |
| 2244 | { |
| 2245 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 2246 | list_del_rcu(&ops->list); |
| 2247 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 2248 | } |
| 2249 | EXPORT_SYMBOL_GPL(nft_unregister_set); |
| 2250 | |
| 2251 | /* |
| 2252 | * Select a set implementation based on the data characteristics and the |
| 2253 | * given policy. The total memory use might not be known if no size is |
| 2254 | * given, in that case the amount of memory per element is used. |
| 2255 | */ |
| 2256 | static const struct nft_set_ops * |
| 2257 | nft_select_set_ops(const struct nlattr * const nla[], |
| 2258 | const struct nft_set_desc *desc, |
| 2259 | enum nft_set_policies policy) |
| 2260 | { |
| 2261 | const struct nft_set_ops *ops, *bops; |
| 2262 | struct nft_set_estimate est, best; |
| 2263 | u32 features; |
| 2264 | |
| 2265 | #ifdef CONFIG_MODULES |
| 2266 | if (list_empty(&nf_tables_set_ops)) { |
| 2267 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 2268 | request_module("nft-set"); |
| 2269 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 2270 | if (!list_empty(&nf_tables_set_ops)) |
| 2271 | return ERR_PTR(-EAGAIN); |
| 2272 | } |
| 2273 | #endif |
| 2274 | features = 0; |
| 2275 | if (nla[NFTA_SET_FLAGS] != NULL) { |
| 2276 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); |
| 2277 | features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT; |
| 2278 | } |
| 2279 | |
| 2280 | bops = NULL; |
| 2281 | best.size = ~0; |
| 2282 | best.class = ~0; |
| 2283 | |
| 2284 | list_for_each_entry(ops, &nf_tables_set_ops, list) { |
| 2285 | if ((ops->features & features) != features) |
| 2286 | continue; |
| 2287 | if (!ops->estimate(desc, features, &est)) |
| 2288 | continue; |
| 2289 | |
| 2290 | switch (policy) { |
| 2291 | case NFT_SET_POL_PERFORMANCE: |
| 2292 | if (est.class < best.class) |
| 2293 | break; |
| 2294 | if (est.class == best.class && est.size < best.size) |
| 2295 | break; |
| 2296 | continue; |
| 2297 | case NFT_SET_POL_MEMORY: |
| 2298 | if (est.size < best.size) |
| 2299 | break; |
| 2300 | if (est.size == best.size && est.class < best.class) |
| 2301 | break; |
| 2302 | continue; |
| 2303 | default: |
| 2304 | break; |
| 2305 | } |
| 2306 | |
| 2307 | if (!try_module_get(ops->owner)) |
| 2308 | continue; |
| 2309 | if (bops != NULL) |
| 2310 | module_put(bops->owner); |
| 2311 | |
| 2312 | bops = ops; |
| 2313 | best = est; |
| 2314 | } |
| 2315 | |
| 2316 | if (bops != NULL) |
| 2317 | return bops; |
| 2318 | |
| 2319 | return ERR_PTR(-EOPNOTSUPP); |
| 2320 | } |
| 2321 | |
| 2322 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { |
| 2323 | [NFTA_SET_TABLE] = { .type = NLA_STRING }, |
| 2324 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
| 2325 | .len = IFNAMSIZ - 1 }, |
| 2326 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
| 2327 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, |
| 2328 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, |
| 2329 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, |
| 2330 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, |
| 2331 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
| 2332 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, |
| 2333 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
| 2334 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
| 2335 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, |
| 2336 | }; |
| 2337 | |
| 2338 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { |
| 2339 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, |
| 2340 | }; |
| 2341 | |
| 2342 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
| 2343 | const struct sk_buff *skb, |
| 2344 | const struct nlmsghdr *nlh, |
| 2345 | const struct nlattr * const nla[]) |
| 2346 | { |
| 2347 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 2348 | struct nft_af_info *afi = NULL; |
| 2349 | struct nft_table *table = NULL; |
| 2350 | |
| 2351 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
| 2352 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
| 2353 | if (IS_ERR(afi)) |
| 2354 | return PTR_ERR(afi); |
| 2355 | } |
| 2356 | |
| 2357 | if (nla[NFTA_SET_TABLE] != NULL) { |
| 2358 | if (afi == NULL) |
| 2359 | return -EAFNOSUPPORT; |
| 2360 | |
| 2361 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
| 2362 | if (IS_ERR(table)) |
| 2363 | return PTR_ERR(table); |
| 2364 | if (table->flags & NFT_TABLE_INACTIVE) |
| 2365 | return -ENOENT; |
| 2366 | } |
| 2367 | |
| 2368 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
| 2369 | return 0; |
| 2370 | } |
| 2371 | |
| 2372 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, |
| 2373 | const struct nlattr *nla) |
| 2374 | { |
| 2375 | struct nft_set *set; |
| 2376 | |
| 2377 | if (nla == NULL) |
| 2378 | return ERR_PTR(-EINVAL); |
| 2379 | |
| 2380 | list_for_each_entry(set, &table->sets, list) { |
| 2381 | if (!nla_strcmp(nla, set->name)) |
| 2382 | return set; |
| 2383 | } |
| 2384 | return ERR_PTR(-ENOENT); |
| 2385 | } |
| 2386 | |
| 2387 | struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
| 2388 | const struct nlattr *nla) |
| 2389 | { |
| 2390 | struct nft_trans *trans; |
| 2391 | u32 id = ntohl(nla_get_be32(nla)); |
| 2392 | |
| 2393 | list_for_each_entry(trans, &net->nft.commit_list, list) { |
| 2394 | if (trans->msg_type == NFT_MSG_NEWSET && |
| 2395 | id == nft_trans_set_id(trans)) |
| 2396 | return nft_trans_set(trans); |
| 2397 | } |
| 2398 | return ERR_PTR(-ENOENT); |
| 2399 | } |
| 2400 | |
| 2401 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
| 2402 | const char *name) |
| 2403 | { |
| 2404 | const struct nft_set *i; |
| 2405 | const char *p; |
| 2406 | unsigned long *inuse; |
| 2407 | unsigned int n = 0, min = 0; |
| 2408 | |
| 2409 | p = strnchr(name, IFNAMSIZ, '%'); |
| 2410 | if (p != NULL) { |
| 2411 | if (p[1] != 'd' || strchr(p + 2, '%')) |
| 2412 | return -EINVAL; |
| 2413 | |
| 2414 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); |
| 2415 | if (inuse == NULL) |
| 2416 | return -ENOMEM; |
| 2417 | cont: |
| 2418 | list_for_each_entry(i, &ctx->table->sets, list) { |
| 2419 | int tmp; |
| 2420 | |
| 2421 | if (!sscanf(i->name, name, &tmp)) |
| 2422 | continue; |
| 2423 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
| 2424 | continue; |
| 2425 | |
| 2426 | set_bit(tmp - min, inuse); |
| 2427 | } |
| 2428 | |
| 2429 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
| 2430 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
| 2431 | min += BITS_PER_BYTE * PAGE_SIZE; |
| 2432 | memset(inuse, 0, PAGE_SIZE); |
| 2433 | goto cont; |
| 2434 | } |
| 2435 | free_page((unsigned long)inuse); |
| 2436 | } |
| 2437 | |
| 2438 | snprintf(set->name, sizeof(set->name), name, min + n); |
| 2439 | list_for_each_entry(i, &ctx->table->sets, list) { |
| 2440 | if (!strcmp(set->name, i->name)) |
| 2441 | return -ENFILE; |
| 2442 | } |
| 2443 | return 0; |
| 2444 | } |
| 2445 | |
| 2446 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, |
| 2447 | const struct nft_set *set, u16 event, u16 flags) |
| 2448 | { |
| 2449 | struct nfgenmsg *nfmsg; |
| 2450 | struct nlmsghdr *nlh; |
| 2451 | struct nlattr *desc; |
| 2452 | u32 portid = ctx->portid; |
| 2453 | u32 seq = ctx->seq; |
| 2454 | |
| 2455 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 2456 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
| 2457 | flags); |
| 2458 | if (nlh == NULL) |
| 2459 | goto nla_put_failure; |
| 2460 | |
| 2461 | nfmsg = nlmsg_data(nlh); |
| 2462 | nfmsg->nfgen_family = ctx->afi->family; |
| 2463 | nfmsg->version = NFNETLINK_V0; |
| 2464 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
| 2465 | |
| 2466 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) |
| 2467 | goto nla_put_failure; |
| 2468 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) |
| 2469 | goto nla_put_failure; |
| 2470 | if (set->flags != 0) |
| 2471 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) |
| 2472 | goto nla_put_failure; |
| 2473 | |
| 2474 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) |
| 2475 | goto nla_put_failure; |
| 2476 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) |
| 2477 | goto nla_put_failure; |
| 2478 | if (set->flags & NFT_SET_MAP) { |
| 2479 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) |
| 2480 | goto nla_put_failure; |
| 2481 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) |
| 2482 | goto nla_put_failure; |
| 2483 | } |
| 2484 | |
| 2485 | if (set->timeout && |
| 2486 | nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout))) |
| 2487 | goto nla_put_failure; |
| 2488 | if (set->gc_int && |
| 2489 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) |
| 2490 | goto nla_put_failure; |
| 2491 | |
| 2492 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
| 2493 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) |
| 2494 | goto nla_put_failure; |
| 2495 | } |
| 2496 | |
| 2497 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
| 2498 | if (desc == NULL) |
| 2499 | goto nla_put_failure; |
| 2500 | if (set->size && |
| 2501 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) |
| 2502 | goto nla_put_failure; |
| 2503 | nla_nest_end(skb, desc); |
| 2504 | |
| 2505 | nlmsg_end(skb, nlh); |
| 2506 | return 0; |
| 2507 | |
| 2508 | nla_put_failure: |
| 2509 | nlmsg_trim(skb, nlh); |
| 2510 | return -1; |
| 2511 | } |
| 2512 | |
| 2513 | static int nf_tables_set_notify(const struct nft_ctx *ctx, |
| 2514 | const struct nft_set *set, |
| 2515 | int event, gfp_t gfp_flags) |
| 2516 | { |
| 2517 | struct sk_buff *skb; |
| 2518 | u32 portid = ctx->portid; |
| 2519 | int err; |
| 2520 | |
| 2521 | if (!ctx->report && |
| 2522 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
| 2523 | return 0; |
| 2524 | |
| 2525 | err = -ENOBUFS; |
| 2526 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
| 2527 | if (skb == NULL) |
| 2528 | goto err; |
| 2529 | |
| 2530 | err = nf_tables_fill_set(skb, ctx, set, event, 0); |
| 2531 | if (err < 0) { |
| 2532 | kfree_skb(skb); |
| 2533 | goto err; |
| 2534 | } |
| 2535 | |
| 2536 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, |
| 2537 | ctx->report, gfp_flags); |
| 2538 | err: |
| 2539 | if (err < 0) |
| 2540 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
| 2541 | return err; |
| 2542 | } |
| 2543 | |
| 2544 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
| 2545 | { |
| 2546 | const struct nft_set *set; |
| 2547 | unsigned int idx, s_idx = cb->args[0]; |
| 2548 | struct nft_af_info *afi; |
| 2549 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
| 2550 | struct net *net = sock_net(skb->sk); |
| 2551 | int cur_family = cb->args[3]; |
| 2552 | struct nft_ctx *ctx = cb->data, ctx_set; |
| 2553 | |
| 2554 | if (cb->args[1]) |
| 2555 | return skb->len; |
| 2556 | |
| 2557 | rcu_read_lock(); |
| 2558 | cb->seq = net->nft.base_seq; |
| 2559 | |
| 2560 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
| 2561 | if (ctx->afi && ctx->afi != afi) |
| 2562 | continue; |
| 2563 | |
| 2564 | if (cur_family) { |
| 2565 | if (afi->family != cur_family) |
| 2566 | continue; |
| 2567 | |
| 2568 | cur_family = 0; |
| 2569 | } |
| 2570 | list_for_each_entry_rcu(table, &afi->tables, list) { |
| 2571 | if (ctx->table && ctx->table != table) |
| 2572 | continue; |
| 2573 | |
| 2574 | if (cur_table) { |
| 2575 | if (cur_table != table) |
| 2576 | continue; |
| 2577 | |
| 2578 | cur_table = NULL; |
| 2579 | } |
| 2580 | idx = 0; |
| 2581 | list_for_each_entry_rcu(set, &table->sets, list) { |
| 2582 | if (idx < s_idx) |
| 2583 | goto cont; |
| 2584 | |
| 2585 | ctx_set = *ctx; |
| 2586 | ctx_set.table = table; |
| 2587 | ctx_set.afi = afi; |
| 2588 | if (nf_tables_fill_set(skb, &ctx_set, set, |
| 2589 | NFT_MSG_NEWSET, |
| 2590 | NLM_F_MULTI) < 0) { |
| 2591 | cb->args[0] = idx; |
| 2592 | cb->args[2] = (unsigned long) table; |
| 2593 | cb->args[3] = afi->family; |
| 2594 | goto done; |
| 2595 | } |
| 2596 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
| 2597 | cont: |
| 2598 | idx++; |
| 2599 | } |
| 2600 | if (s_idx) |
| 2601 | s_idx = 0; |
| 2602 | } |
| 2603 | } |
| 2604 | cb->args[1] = 1; |
| 2605 | done: |
| 2606 | rcu_read_unlock(); |
| 2607 | return skb->len; |
| 2608 | } |
| 2609 | |
| 2610 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
| 2611 | { |
| 2612 | kfree(cb->data); |
| 2613 | return 0; |
| 2614 | } |
| 2615 | |
| 2616 | static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb, |
| 2617 | const struct nlmsghdr *nlh, |
| 2618 | const struct nlattr * const nla[]) |
| 2619 | { |
| 2620 | struct net *net = sock_net(skb->sk); |
| 2621 | const struct nft_set *set; |
| 2622 | struct nft_ctx ctx; |
| 2623 | struct sk_buff *skb2; |
| 2624 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 2625 | int err; |
| 2626 | |
| 2627 | /* Verify existence before starting dump */ |
| 2628 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla); |
| 2629 | if (err < 0) |
| 2630 | return err; |
| 2631 | |
| 2632 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 2633 | struct netlink_dump_control c = { |
| 2634 | .dump = nf_tables_dump_sets, |
| 2635 | .done = nf_tables_dump_sets_done, |
| 2636 | }; |
| 2637 | struct nft_ctx *ctx_dump; |
| 2638 | |
| 2639 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); |
| 2640 | if (ctx_dump == NULL) |
| 2641 | return -ENOMEM; |
| 2642 | |
| 2643 | *ctx_dump = ctx; |
| 2644 | c.data = ctx_dump; |
| 2645 | |
| 2646 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 2647 | } |
| 2648 | |
| 2649 | /* Only accept unspec with dump */ |
| 2650 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
| 2651 | return -EAFNOSUPPORT; |
| 2652 | |
| 2653 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
| 2654 | if (IS_ERR(set)) |
| 2655 | return PTR_ERR(set); |
| 2656 | if (set->flags & NFT_SET_INACTIVE) |
| 2657 | return -ENOENT; |
| 2658 | |
| 2659 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 2660 | if (skb2 == NULL) |
| 2661 | return -ENOMEM; |
| 2662 | |
| 2663 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); |
| 2664 | if (err < 0) |
| 2665 | goto err; |
| 2666 | |
| 2667 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 2668 | |
| 2669 | err: |
| 2670 | kfree_skb(skb2); |
| 2671 | return err; |
| 2672 | } |
| 2673 | |
| 2674 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
| 2675 | struct nft_set_desc *desc, |
| 2676 | const struct nlattr *nla) |
| 2677 | { |
| 2678 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; |
| 2679 | int err; |
| 2680 | |
| 2681 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy); |
| 2682 | if (err < 0) |
| 2683 | return err; |
| 2684 | |
| 2685 | if (da[NFTA_SET_DESC_SIZE] != NULL) |
| 2686 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); |
| 2687 | |
| 2688 | return 0; |
| 2689 | } |
| 2690 | |
| 2691 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
| 2692 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 2693 | const struct nlattr * const nla[]) |
| 2694 | { |
| 2695 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 2696 | const struct nft_set_ops *ops; |
| 2697 | struct nft_af_info *afi; |
| 2698 | struct nft_table *table; |
| 2699 | struct nft_set *set; |
| 2700 | struct nft_ctx ctx; |
| 2701 | char name[IFNAMSIZ]; |
| 2702 | unsigned int size; |
| 2703 | bool create; |
| 2704 | u64 timeout; |
| 2705 | u32 ktype, dtype, flags, policy, gc_int; |
| 2706 | struct nft_set_desc desc; |
| 2707 | int err; |
| 2708 | |
| 2709 | if (nla[NFTA_SET_TABLE] == NULL || |
| 2710 | nla[NFTA_SET_NAME] == NULL || |
| 2711 | nla[NFTA_SET_KEY_LEN] == NULL || |
| 2712 | nla[NFTA_SET_ID] == NULL) |
| 2713 | return -EINVAL; |
| 2714 | |
| 2715 | memset(&desc, 0, sizeof(desc)); |
| 2716 | |
| 2717 | ktype = NFT_DATA_VALUE; |
| 2718 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { |
| 2719 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); |
| 2720 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) |
| 2721 | return -EINVAL; |
| 2722 | } |
| 2723 | |
| 2724 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
| 2725 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
| 2726 | return -EINVAL; |
| 2727 | |
| 2728 | flags = 0; |
| 2729 | if (nla[NFTA_SET_FLAGS] != NULL) { |
| 2730 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); |
| 2731 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | |
| 2732 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
| 2733 | NFT_SET_MAP | NFT_SET_EVAL)) |
| 2734 | return -EINVAL; |
| 2735 | /* Only one of both operations is supported */ |
| 2736 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) == |
| 2737 | (NFT_SET_MAP | NFT_SET_EVAL)) |
| 2738 | return -EOPNOTSUPP; |
| 2739 | } |
| 2740 | |
| 2741 | dtype = 0; |
| 2742 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
| 2743 | if (!(flags & NFT_SET_MAP)) |
| 2744 | return -EINVAL; |
| 2745 | |
| 2746 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); |
| 2747 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && |
| 2748 | dtype != NFT_DATA_VERDICT) |
| 2749 | return -EINVAL; |
| 2750 | |
| 2751 | if (dtype != NFT_DATA_VERDICT) { |
| 2752 | if (nla[NFTA_SET_DATA_LEN] == NULL) |
| 2753 | return -EINVAL; |
| 2754 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
| 2755 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
| 2756 | return -EINVAL; |
| 2757 | } else |
| 2758 | desc.dlen = sizeof(struct nft_verdict); |
| 2759 | } else if (flags & NFT_SET_MAP) |
| 2760 | return -EINVAL; |
| 2761 | |
| 2762 | timeout = 0; |
| 2763 | if (nla[NFTA_SET_TIMEOUT] != NULL) { |
| 2764 | if (!(flags & NFT_SET_TIMEOUT)) |
| 2765 | return -EINVAL; |
| 2766 | timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT])); |
| 2767 | } |
| 2768 | gc_int = 0; |
| 2769 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { |
| 2770 | if (!(flags & NFT_SET_TIMEOUT)) |
| 2771 | return -EINVAL; |
| 2772 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); |
| 2773 | } |
| 2774 | |
| 2775 | policy = NFT_SET_POL_PERFORMANCE; |
| 2776 | if (nla[NFTA_SET_POLICY] != NULL) |
| 2777 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); |
| 2778 | |
| 2779 | if (nla[NFTA_SET_DESC] != NULL) { |
| 2780 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); |
| 2781 | if (err < 0) |
| 2782 | return err; |
| 2783 | } |
| 2784 | |
| 2785 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| 2786 | |
| 2787 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
| 2788 | if (IS_ERR(afi)) |
| 2789 | return PTR_ERR(afi); |
| 2790 | |
| 2791 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
| 2792 | if (IS_ERR(table)) |
| 2793 | return PTR_ERR(table); |
| 2794 | |
| 2795 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
| 2796 | |
| 2797 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); |
| 2798 | if (IS_ERR(set)) { |
| 2799 | if (PTR_ERR(set) != -ENOENT) |
| 2800 | return PTR_ERR(set); |
| 2801 | set = NULL; |
| 2802 | } |
| 2803 | |
| 2804 | if (set != NULL) { |
| 2805 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 2806 | return -EEXIST; |
| 2807 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 2808 | return -EOPNOTSUPP; |
| 2809 | return 0; |
| 2810 | } |
| 2811 | |
| 2812 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) |
| 2813 | return -ENOENT; |
| 2814 | |
| 2815 | ops = nft_select_set_ops(nla, &desc, policy); |
| 2816 | if (IS_ERR(ops)) |
| 2817 | return PTR_ERR(ops); |
| 2818 | |
| 2819 | size = 0; |
| 2820 | if (ops->privsize != NULL) |
| 2821 | size = ops->privsize(nla); |
| 2822 | |
| 2823 | err = -ENOMEM; |
| 2824 | set = kzalloc(sizeof(*set) + size, GFP_KERNEL); |
| 2825 | if (set == NULL) |
| 2826 | goto err1; |
| 2827 | |
| 2828 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); |
| 2829 | err = nf_tables_set_alloc_name(&ctx, set, name); |
| 2830 | if (err < 0) |
| 2831 | goto err2; |
| 2832 | |
| 2833 | INIT_LIST_HEAD(&set->bindings); |
| 2834 | write_pnet(&set->pnet, net); |
| 2835 | set->ops = ops; |
| 2836 | set->ktype = ktype; |
| 2837 | set->klen = desc.klen; |
| 2838 | set->dtype = dtype; |
| 2839 | set->dlen = desc.dlen; |
| 2840 | set->flags = flags; |
| 2841 | set->size = desc.size; |
| 2842 | set->policy = policy; |
| 2843 | set->timeout = timeout; |
| 2844 | set->gc_int = gc_int; |
| 2845 | |
| 2846 | err = ops->init(set, &desc, nla); |
| 2847 | if (err < 0) |
| 2848 | goto err2; |
| 2849 | |
| 2850 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
| 2851 | if (err < 0) |
| 2852 | goto err2; |
| 2853 | |
| 2854 | list_add_tail_rcu(&set->list, &table->sets); |
| 2855 | table->use++; |
| 2856 | return 0; |
| 2857 | |
| 2858 | err2: |
| 2859 | kfree(set); |
| 2860 | err1: |
| 2861 | module_put(ops->owner); |
| 2862 | return err; |
| 2863 | } |
| 2864 | |
| 2865 | static void nft_set_destroy(struct nft_set *set) |
| 2866 | { |
| 2867 | set->ops->destroy(set); |
| 2868 | module_put(set->ops->owner); |
| 2869 | kfree(set); |
| 2870 | } |
| 2871 | |
| 2872 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
| 2873 | { |
| 2874 | list_del_rcu(&set->list); |
| 2875 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
| 2876 | nft_set_destroy(set); |
| 2877 | } |
| 2878 | |
| 2879 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
| 2880 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 2881 | const struct nlattr * const nla[]) |
| 2882 | { |
| 2883 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 2884 | struct nft_set *set; |
| 2885 | struct nft_ctx ctx; |
| 2886 | int err; |
| 2887 | |
| 2888 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
| 2889 | return -EAFNOSUPPORT; |
| 2890 | if (nla[NFTA_SET_TABLE] == NULL) |
| 2891 | return -EINVAL; |
| 2892 | |
| 2893 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla); |
| 2894 | if (err < 0) |
| 2895 | return err; |
| 2896 | |
| 2897 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
| 2898 | if (IS_ERR(set)) |
| 2899 | return PTR_ERR(set); |
| 2900 | if (set->flags & NFT_SET_INACTIVE) |
| 2901 | return -ENOENT; |
| 2902 | if (!list_empty(&set->bindings)) |
| 2903 | return -EBUSY; |
| 2904 | |
| 2905 | return nft_delset(&ctx, set); |
| 2906 | } |
| 2907 | |
| 2908 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, |
| 2909 | const struct nft_set *set, |
| 2910 | const struct nft_set_iter *iter, |
| 2911 | const struct nft_set_elem *elem) |
| 2912 | { |
| 2913 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
| 2914 | enum nft_registers dreg; |
| 2915 | |
| 2916 | dreg = nft_type_to_reg(set->dtype); |
| 2917 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
| 2918 | set->dtype == NFT_DATA_VERDICT ? |
| 2919 | NFT_DATA_VERDICT : NFT_DATA_VALUE, |
| 2920 | set->dlen); |
| 2921 | } |
| 2922 | |
| 2923 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, |
| 2924 | struct nft_set_binding *binding) |
| 2925 | { |
| 2926 | struct nft_set_binding *i; |
| 2927 | struct nft_set_iter iter; |
| 2928 | |
| 2929 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) |
| 2930 | return -EBUSY; |
| 2931 | |
| 2932 | if (binding->flags & NFT_SET_MAP) { |
| 2933 | /* If the set is already bound to the same chain all |
| 2934 | * jumps are already validated for that chain. |
| 2935 | */ |
| 2936 | list_for_each_entry(i, &set->bindings, list) { |
| 2937 | if (binding->flags & NFT_SET_MAP && |
| 2938 | i->chain == binding->chain) |
| 2939 | goto bind; |
| 2940 | } |
| 2941 | |
| 2942 | iter.skip = 0; |
| 2943 | iter.count = 0; |
| 2944 | iter.err = 0; |
| 2945 | iter.fn = nf_tables_bind_check_setelem; |
| 2946 | |
| 2947 | set->ops->walk(ctx, set, &iter); |
| 2948 | if (iter.err < 0) { |
| 2949 | /* Destroy anonymous sets if binding fails */ |
| 2950 | if (set->flags & NFT_SET_ANONYMOUS) |
| 2951 | nf_tables_set_destroy(ctx, set); |
| 2952 | |
| 2953 | return iter.err; |
| 2954 | } |
| 2955 | } |
| 2956 | bind: |
| 2957 | binding->chain = ctx->chain; |
| 2958 | list_add_tail_rcu(&binding->list, &set->bindings); |
| 2959 | return 0; |
| 2960 | } |
| 2961 | |
| 2962 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, |
| 2963 | struct nft_set_binding *binding) |
| 2964 | { |
| 2965 | list_del_rcu(&binding->list); |
| 2966 | |
| 2967 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
| 2968 | !(set->flags & NFT_SET_INACTIVE)) |
| 2969 | nf_tables_set_destroy(ctx, set); |
| 2970 | } |
| 2971 | |
| 2972 | const struct nft_set_ext_type nft_set_ext_types[] = { |
| 2973 | [NFT_SET_EXT_KEY] = { |
| 2974 | .align = __alignof__(u32), |
| 2975 | }, |
| 2976 | [NFT_SET_EXT_DATA] = { |
| 2977 | .align = __alignof__(u32), |
| 2978 | }, |
| 2979 | [NFT_SET_EXT_EXPR] = { |
| 2980 | .align = __alignof__(struct nft_expr), |
| 2981 | }, |
| 2982 | [NFT_SET_EXT_FLAGS] = { |
| 2983 | .len = sizeof(u8), |
| 2984 | .align = __alignof__(u8), |
| 2985 | }, |
| 2986 | [NFT_SET_EXT_TIMEOUT] = { |
| 2987 | .len = sizeof(u64), |
| 2988 | .align = __alignof__(u64), |
| 2989 | }, |
| 2990 | [NFT_SET_EXT_EXPIRATION] = { |
| 2991 | .len = sizeof(unsigned long), |
| 2992 | .align = __alignof__(unsigned long), |
| 2993 | }, |
| 2994 | [NFT_SET_EXT_USERDATA] = { |
| 2995 | .len = sizeof(struct nft_userdata), |
| 2996 | .align = __alignof__(struct nft_userdata), |
| 2997 | }, |
| 2998 | }; |
| 2999 | EXPORT_SYMBOL_GPL(nft_set_ext_types); |
| 3000 | |
| 3001 | /* |
| 3002 | * Set elements |
| 3003 | */ |
| 3004 | |
| 3005 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { |
| 3006 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, |
| 3007 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, |
| 3008 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, |
| 3009 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
| 3010 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
| 3011 | .len = NFT_USERDATA_MAXLEN }, |
| 3012 | }; |
| 3013 | |
| 3014 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { |
| 3015 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING }, |
| 3016 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING }, |
| 3017 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
| 3018 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
| 3019 | }; |
| 3020 | |
| 3021 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
| 3022 | const struct sk_buff *skb, |
| 3023 | const struct nlmsghdr *nlh, |
| 3024 | const struct nlattr * const nla[], |
| 3025 | bool trans) |
| 3026 | { |
| 3027 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 3028 | struct nft_af_info *afi; |
| 3029 | struct nft_table *table; |
| 3030 | |
| 3031 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
| 3032 | if (IS_ERR(afi)) |
| 3033 | return PTR_ERR(afi); |
| 3034 | |
| 3035 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]); |
| 3036 | if (IS_ERR(table)) |
| 3037 | return PTR_ERR(table); |
| 3038 | if (!trans && (table->flags & NFT_TABLE_INACTIVE)) |
| 3039 | return -ENOENT; |
| 3040 | |
| 3041 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
| 3042 | return 0; |
| 3043 | } |
| 3044 | |
| 3045 | static int nf_tables_fill_setelem(struct sk_buff *skb, |
| 3046 | const struct nft_set *set, |
| 3047 | const struct nft_set_elem *elem) |
| 3048 | { |
| 3049 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
| 3050 | unsigned char *b = skb_tail_pointer(skb); |
| 3051 | struct nlattr *nest; |
| 3052 | |
| 3053 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); |
| 3054 | if (nest == NULL) |
| 3055 | goto nla_put_failure; |
| 3056 | |
| 3057 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
| 3058 | NFT_DATA_VALUE, set->klen) < 0) |
| 3059 | goto nla_put_failure; |
| 3060 | |
| 3061 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
| 3062 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), |
| 3063 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
| 3064 | set->dlen) < 0) |
| 3065 | goto nla_put_failure; |
| 3066 | |
| 3067 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
| 3068 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) |
| 3069 | goto nla_put_failure; |
| 3070 | |
| 3071 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
| 3072 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, |
| 3073 | htonl(*nft_set_ext_flags(ext)))) |
| 3074 | goto nla_put_failure; |
| 3075 | |
| 3076 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
| 3077 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, |
| 3078 | cpu_to_be64(*nft_set_ext_timeout(ext)))) |
| 3079 | goto nla_put_failure; |
| 3080 | |
| 3081 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { |
| 3082 | unsigned long expires, now = jiffies; |
| 3083 | |
| 3084 | expires = *nft_set_ext_expiration(ext); |
| 3085 | if (time_before(now, expires)) |
| 3086 | expires -= now; |
| 3087 | else |
| 3088 | expires = 0; |
| 3089 | |
| 3090 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, |
| 3091 | cpu_to_be64(jiffies_to_msecs(expires)))) |
| 3092 | goto nla_put_failure; |
| 3093 | } |
| 3094 | |
| 3095 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
| 3096 | struct nft_userdata *udata; |
| 3097 | |
| 3098 | udata = nft_set_ext_userdata(ext); |
| 3099 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, |
| 3100 | udata->len + 1, udata->data)) |
| 3101 | goto nla_put_failure; |
| 3102 | } |
| 3103 | |
| 3104 | nla_nest_end(skb, nest); |
| 3105 | return 0; |
| 3106 | |
| 3107 | nla_put_failure: |
| 3108 | nlmsg_trim(skb, b); |
| 3109 | return -EMSGSIZE; |
| 3110 | } |
| 3111 | |
| 3112 | struct nft_set_dump_args { |
| 3113 | const struct netlink_callback *cb; |
| 3114 | struct nft_set_iter iter; |
| 3115 | struct sk_buff *skb; |
| 3116 | }; |
| 3117 | |
| 3118 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, |
| 3119 | const struct nft_set *set, |
| 3120 | const struct nft_set_iter *iter, |
| 3121 | const struct nft_set_elem *elem) |
| 3122 | { |
| 3123 | struct nft_set_dump_args *args; |
| 3124 | |
| 3125 | args = container_of(iter, struct nft_set_dump_args, iter); |
| 3126 | return nf_tables_fill_setelem(args->skb, set, elem); |
| 3127 | } |
| 3128 | |
| 3129 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
| 3130 | { |
| 3131 | struct net *net = sock_net(skb->sk); |
| 3132 | const struct nft_set *set; |
| 3133 | struct nft_set_dump_args args; |
| 3134 | struct nft_ctx ctx; |
| 3135 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; |
| 3136 | struct nfgenmsg *nfmsg; |
| 3137 | struct nlmsghdr *nlh; |
| 3138 | struct nlattr *nest; |
| 3139 | u32 portid, seq; |
| 3140 | int event, err; |
| 3141 | |
| 3142 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
| 3143 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); |
| 3144 | if (err < 0) |
| 3145 | return err; |
| 3146 | |
| 3147 | err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh, |
| 3148 | (void *)nla, false); |
| 3149 | if (err < 0) |
| 3150 | return err; |
| 3151 | |
| 3152 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| 3153 | if (IS_ERR(set)) |
| 3154 | return PTR_ERR(set); |
| 3155 | if (set->flags & NFT_SET_INACTIVE) |
| 3156 | return -ENOENT; |
| 3157 | |
| 3158 | event = NFT_MSG_NEWSETELEM; |
| 3159 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 3160 | portid = NETLINK_CB(cb->skb).portid; |
| 3161 | seq = cb->nlh->nlmsg_seq; |
| 3162 | |
| 3163 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
| 3164 | NLM_F_MULTI); |
| 3165 | if (nlh == NULL) |
| 3166 | goto nla_put_failure; |
| 3167 | |
| 3168 | nfmsg = nlmsg_data(nlh); |
| 3169 | nfmsg->nfgen_family = ctx.afi->family; |
| 3170 | nfmsg->version = NFNETLINK_V0; |
| 3171 | nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff); |
| 3172 | |
| 3173 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) |
| 3174 | goto nla_put_failure; |
| 3175 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) |
| 3176 | goto nla_put_failure; |
| 3177 | |
| 3178 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); |
| 3179 | if (nest == NULL) |
| 3180 | goto nla_put_failure; |
| 3181 | |
| 3182 | args.cb = cb; |
| 3183 | args.skb = skb; |
| 3184 | args.iter.skip = cb->args[0]; |
| 3185 | args.iter.count = 0; |
| 3186 | args.iter.err = 0; |
| 3187 | args.iter.fn = nf_tables_dump_setelem; |
| 3188 | set->ops->walk(&ctx, set, &args.iter); |
| 3189 | |
| 3190 | nla_nest_end(skb, nest); |
| 3191 | nlmsg_end(skb, nlh); |
| 3192 | |
| 3193 | if (args.iter.err && args.iter.err != -EMSGSIZE) |
| 3194 | return args.iter.err; |
| 3195 | if (args.iter.count == cb->args[0]) |
| 3196 | return 0; |
| 3197 | |
| 3198 | cb->args[0] = args.iter.count; |
| 3199 | return skb->len; |
| 3200 | |
| 3201 | nla_put_failure: |
| 3202 | return -ENOSPC; |
| 3203 | } |
| 3204 | |
| 3205 | static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb, |
| 3206 | const struct nlmsghdr *nlh, |
| 3207 | const struct nlattr * const nla[]) |
| 3208 | { |
| 3209 | struct net *net = sock_net(skb->sk); |
| 3210 | const struct nft_set *set; |
| 3211 | struct nft_ctx ctx; |
| 3212 | int err; |
| 3213 | |
| 3214 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, false); |
| 3215 | if (err < 0) |
| 3216 | return err; |
| 3217 | |
| 3218 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| 3219 | if (IS_ERR(set)) |
| 3220 | return PTR_ERR(set); |
| 3221 | if (set->flags & NFT_SET_INACTIVE) |
| 3222 | return -ENOENT; |
| 3223 | |
| 3224 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 3225 | struct netlink_dump_control c = { |
| 3226 | .dump = nf_tables_dump_set, |
| 3227 | }; |
| 3228 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 3229 | } |
| 3230 | return -EOPNOTSUPP; |
| 3231 | } |
| 3232 | |
| 3233 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
| 3234 | const struct nft_ctx *ctx, u32 seq, |
| 3235 | u32 portid, int event, u16 flags, |
| 3236 | const struct nft_set *set, |
| 3237 | const struct nft_set_elem *elem) |
| 3238 | { |
| 3239 | struct nfgenmsg *nfmsg; |
| 3240 | struct nlmsghdr *nlh; |
| 3241 | struct nlattr *nest; |
| 3242 | int err; |
| 3243 | |
| 3244 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 3245 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
| 3246 | flags); |
| 3247 | if (nlh == NULL) |
| 3248 | goto nla_put_failure; |
| 3249 | |
| 3250 | nfmsg = nlmsg_data(nlh); |
| 3251 | nfmsg->nfgen_family = ctx->afi->family; |
| 3252 | nfmsg->version = NFNETLINK_V0; |
| 3253 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
| 3254 | |
| 3255 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) |
| 3256 | goto nla_put_failure; |
| 3257 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) |
| 3258 | goto nla_put_failure; |
| 3259 | |
| 3260 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); |
| 3261 | if (nest == NULL) |
| 3262 | goto nla_put_failure; |
| 3263 | |
| 3264 | err = nf_tables_fill_setelem(skb, set, elem); |
| 3265 | if (err < 0) |
| 3266 | goto nla_put_failure; |
| 3267 | |
| 3268 | nla_nest_end(skb, nest); |
| 3269 | |
| 3270 | nlmsg_end(skb, nlh); |
| 3271 | return 0; |
| 3272 | |
| 3273 | nla_put_failure: |
| 3274 | nlmsg_trim(skb, nlh); |
| 3275 | return -1; |
| 3276 | } |
| 3277 | |
| 3278 | static int nf_tables_setelem_notify(const struct nft_ctx *ctx, |
| 3279 | const struct nft_set *set, |
| 3280 | const struct nft_set_elem *elem, |
| 3281 | int event, u16 flags) |
| 3282 | { |
| 3283 | struct net *net = ctx->net; |
| 3284 | u32 portid = ctx->portid; |
| 3285 | struct sk_buff *skb; |
| 3286 | int err; |
| 3287 | |
| 3288 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
| 3289 | return 0; |
| 3290 | |
| 3291 | err = -ENOBUFS; |
| 3292 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 3293 | if (skb == NULL) |
| 3294 | goto err; |
| 3295 | |
| 3296 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, |
| 3297 | set, elem); |
| 3298 | if (err < 0) { |
| 3299 | kfree_skb(skb); |
| 3300 | goto err; |
| 3301 | } |
| 3302 | |
| 3303 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
| 3304 | GFP_KERNEL); |
| 3305 | err: |
| 3306 | if (err < 0) |
| 3307 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); |
| 3308 | return err; |
| 3309 | } |
| 3310 | |
| 3311 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
| 3312 | int msg_type, |
| 3313 | struct nft_set *set) |
| 3314 | { |
| 3315 | struct nft_trans *trans; |
| 3316 | |
| 3317 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); |
| 3318 | if (trans == NULL) |
| 3319 | return NULL; |
| 3320 | |
| 3321 | nft_trans_elem_set(trans) = set; |
| 3322 | return trans; |
| 3323 | } |
| 3324 | |
| 3325 | void *nft_set_elem_init(const struct nft_set *set, |
| 3326 | const struct nft_set_ext_tmpl *tmpl, |
| 3327 | const u32 *key, const u32 *data, |
| 3328 | u64 timeout, gfp_t gfp) |
| 3329 | { |
| 3330 | struct nft_set_ext *ext; |
| 3331 | void *elem; |
| 3332 | |
| 3333 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); |
| 3334 | if (elem == NULL) |
| 3335 | return NULL; |
| 3336 | |
| 3337 | ext = nft_set_elem_ext(set, elem); |
| 3338 | nft_set_ext_init(ext, tmpl); |
| 3339 | |
| 3340 | memcpy(nft_set_ext_key(ext), key, set->klen); |
| 3341 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) |
| 3342 | memcpy(nft_set_ext_data(ext), data, set->dlen); |
| 3343 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
| 3344 | *nft_set_ext_expiration(ext) = |
| 3345 | jiffies + msecs_to_jiffies(timeout); |
| 3346 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) |
| 3347 | *nft_set_ext_timeout(ext) = timeout; |
| 3348 | |
| 3349 | return elem; |
| 3350 | } |
| 3351 | |
| 3352 | void nft_set_elem_destroy(const struct nft_set *set, void *elem) |
| 3353 | { |
| 3354 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); |
| 3355 | |
| 3356 | nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE); |
| 3357 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) |
| 3358 | nft_data_uninit(nft_set_ext_data(ext), set->dtype); |
| 3359 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) |
| 3360 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); |
| 3361 | |
| 3362 | kfree(elem); |
| 3363 | } |
| 3364 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); |
| 3365 | |
| 3366 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
| 3367 | const struct nlattr *attr) |
| 3368 | { |
| 3369 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; |
| 3370 | struct nft_data_desc d1, d2; |
| 3371 | struct nft_set_ext_tmpl tmpl; |
| 3372 | struct nft_set_ext *ext; |
| 3373 | struct nft_set_elem elem; |
| 3374 | struct nft_set_binding *binding; |
| 3375 | struct nft_userdata *udata; |
| 3376 | struct nft_data data; |
| 3377 | enum nft_registers dreg; |
| 3378 | struct nft_trans *trans; |
| 3379 | u64 timeout; |
| 3380 | u32 flags; |
| 3381 | u8 ulen; |
| 3382 | int err; |
| 3383 | |
| 3384 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, |
| 3385 | nft_set_elem_policy); |
| 3386 | if (err < 0) |
| 3387 | return err; |
| 3388 | |
| 3389 | if (nla[NFTA_SET_ELEM_KEY] == NULL) |
| 3390 | return -EINVAL; |
| 3391 | |
| 3392 | nft_set_ext_prepare(&tmpl); |
| 3393 | |
| 3394 | flags = 0; |
| 3395 | if (nla[NFTA_SET_ELEM_FLAGS] != NULL) { |
| 3396 | flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS])); |
| 3397 | if (flags & ~NFT_SET_ELEM_INTERVAL_END) |
| 3398 | return -EINVAL; |
| 3399 | if (!(set->flags & NFT_SET_INTERVAL) && |
| 3400 | flags & NFT_SET_ELEM_INTERVAL_END) |
| 3401 | return -EINVAL; |
| 3402 | if (flags != 0) |
| 3403 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); |
| 3404 | } |
| 3405 | |
| 3406 | if (set->flags & NFT_SET_MAP) { |
| 3407 | if (nla[NFTA_SET_ELEM_DATA] == NULL && |
| 3408 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
| 3409 | return -EINVAL; |
| 3410 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
| 3411 | flags & NFT_SET_ELEM_INTERVAL_END) |
| 3412 | return -EINVAL; |
| 3413 | } else { |
| 3414 | if (nla[NFTA_SET_ELEM_DATA] != NULL) |
| 3415 | return -EINVAL; |
| 3416 | } |
| 3417 | |
| 3418 | timeout = 0; |
| 3419 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { |
| 3420 | if (!(set->flags & NFT_SET_TIMEOUT)) |
| 3421 | return -EINVAL; |
| 3422 | timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT])); |
| 3423 | } else if (set->flags & NFT_SET_TIMEOUT) { |
| 3424 | timeout = set->timeout; |
| 3425 | } |
| 3426 | |
| 3427 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
| 3428 | nla[NFTA_SET_ELEM_KEY]); |
| 3429 | if (err < 0) |
| 3430 | goto err1; |
| 3431 | err = -EINVAL; |
| 3432 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) |
| 3433 | goto err2; |
| 3434 | |
| 3435 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
| 3436 | if (timeout > 0) { |
| 3437 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); |
| 3438 | if (timeout != set->timeout) |
| 3439 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); |
| 3440 | } |
| 3441 | |
| 3442 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
| 3443 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
| 3444 | nla[NFTA_SET_ELEM_DATA]); |
| 3445 | if (err < 0) |
| 3446 | goto err2; |
| 3447 | |
| 3448 | err = -EINVAL; |
| 3449 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) |
| 3450 | goto err3; |
| 3451 | |
| 3452 | dreg = nft_type_to_reg(set->dtype); |
| 3453 | list_for_each_entry(binding, &set->bindings, list) { |
| 3454 | struct nft_ctx bind_ctx = { |
| 3455 | .afi = ctx->afi, |
| 3456 | .table = ctx->table, |
| 3457 | .chain = (struct nft_chain *)binding->chain, |
| 3458 | }; |
| 3459 | |
| 3460 | if (!(binding->flags & NFT_SET_MAP)) |
| 3461 | continue; |
| 3462 | |
| 3463 | err = nft_validate_register_store(&bind_ctx, dreg, |
| 3464 | &data, |
| 3465 | d2.type, d2.len); |
| 3466 | if (err < 0) |
| 3467 | goto err3; |
| 3468 | } |
| 3469 | |
| 3470 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
| 3471 | } |
| 3472 | |
| 3473 | /* The full maximum length of userdata can exceed the maximum |
| 3474 | * offset value (U8_MAX) for following extensions, therefor it |
| 3475 | * must be the last extension added. |
| 3476 | */ |
| 3477 | ulen = 0; |
| 3478 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { |
| 3479 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); |
| 3480 | if (ulen > 0) |
| 3481 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, |
| 3482 | ulen); |
| 3483 | } |
| 3484 | |
| 3485 | err = -ENOMEM; |
| 3486 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
| 3487 | timeout, GFP_KERNEL); |
| 3488 | if (elem.priv == NULL) |
| 3489 | goto err3; |
| 3490 | |
| 3491 | ext = nft_set_elem_ext(set, elem.priv); |
| 3492 | if (flags) |
| 3493 | *nft_set_ext_flags(ext) = flags; |
| 3494 | if (ulen > 0) { |
| 3495 | udata = nft_set_ext_userdata(ext); |
| 3496 | udata->len = ulen - 1; |
| 3497 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); |
| 3498 | } |
| 3499 | |
| 3500 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
| 3501 | if (trans == NULL) |
| 3502 | goto err4; |
| 3503 | |
| 3504 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
| 3505 | err = set->ops->insert(set, &elem); |
| 3506 | if (err < 0) |
| 3507 | goto err5; |
| 3508 | |
| 3509 | nft_trans_elem(trans) = elem; |
| 3510 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 3511 | return 0; |
| 3512 | |
| 3513 | err5: |
| 3514 | kfree(trans); |
| 3515 | err4: |
| 3516 | kfree(elem.priv); |
| 3517 | err3: |
| 3518 | if (nla[NFTA_SET_ELEM_DATA] != NULL) |
| 3519 | nft_data_uninit(&data, d2.type); |
| 3520 | err2: |
| 3521 | nft_data_uninit(&elem.key.val, d1.type); |
| 3522 | err1: |
| 3523 | return err; |
| 3524 | } |
| 3525 | |
| 3526 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
| 3527 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 3528 | const struct nlattr * const nla[]) |
| 3529 | { |
| 3530 | const struct nlattr *attr; |
| 3531 | struct nft_set *set; |
| 3532 | struct nft_ctx ctx; |
| 3533 | int rem, err = 0; |
| 3534 | |
| 3535 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
| 3536 | return -EINVAL; |
| 3537 | |
| 3538 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, true); |
| 3539 | if (err < 0) |
| 3540 | return err; |
| 3541 | |
| 3542 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| 3543 | if (IS_ERR(set)) { |
| 3544 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { |
| 3545 | set = nf_tables_set_lookup_byid(net, |
| 3546 | nla[NFTA_SET_ELEM_LIST_SET_ID]); |
| 3547 | } |
| 3548 | if (IS_ERR(set)) |
| 3549 | return PTR_ERR(set); |
| 3550 | } |
| 3551 | |
| 3552 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
| 3553 | return -EBUSY; |
| 3554 | |
| 3555 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
| 3556 | if (set->size && |
| 3557 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) |
| 3558 | return -ENFILE; |
| 3559 | |
| 3560 | err = nft_add_set_elem(&ctx, set, attr); |
| 3561 | if (err < 0) { |
| 3562 | atomic_dec(&set->nelems); |
| 3563 | break; |
| 3564 | } |
| 3565 | } |
| 3566 | return err; |
| 3567 | } |
| 3568 | |
| 3569 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
| 3570 | const struct nlattr *attr) |
| 3571 | { |
| 3572 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; |
| 3573 | struct nft_data_desc desc; |
| 3574 | struct nft_set_elem elem; |
| 3575 | struct nft_trans *trans; |
| 3576 | int err; |
| 3577 | |
| 3578 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, |
| 3579 | nft_set_elem_policy); |
| 3580 | if (err < 0) |
| 3581 | goto err1; |
| 3582 | |
| 3583 | err = -EINVAL; |
| 3584 | if (nla[NFTA_SET_ELEM_KEY] == NULL) |
| 3585 | goto err1; |
| 3586 | |
| 3587 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
| 3588 | nla[NFTA_SET_ELEM_KEY]); |
| 3589 | if (err < 0) |
| 3590 | goto err1; |
| 3591 | |
| 3592 | err = -EINVAL; |
| 3593 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) |
| 3594 | goto err2; |
| 3595 | |
| 3596 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
| 3597 | if (trans == NULL) { |
| 3598 | err = -ENOMEM; |
| 3599 | goto err2; |
| 3600 | } |
| 3601 | |
| 3602 | elem.priv = set->ops->deactivate(set, &elem); |
| 3603 | if (elem.priv == NULL) { |
| 3604 | err = -ENOENT; |
| 3605 | goto err3; |
| 3606 | } |
| 3607 | |
| 3608 | nft_trans_elem(trans) = elem; |
| 3609 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 3610 | return 0; |
| 3611 | |
| 3612 | err3: |
| 3613 | kfree(trans); |
| 3614 | err2: |
| 3615 | nft_data_uninit(&elem.key.val, desc.type); |
| 3616 | err1: |
| 3617 | return err; |
| 3618 | } |
| 3619 | |
| 3620 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
| 3621 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
| 3622 | const struct nlattr * const nla[]) |
| 3623 | { |
| 3624 | const struct nlattr *attr; |
| 3625 | struct nft_set *set; |
| 3626 | struct nft_ctx ctx; |
| 3627 | int rem, err = 0; |
| 3628 | |
| 3629 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
| 3630 | return -EINVAL; |
| 3631 | |
| 3632 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, false); |
| 3633 | if (err < 0) |
| 3634 | return err; |
| 3635 | |
| 3636 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| 3637 | if (IS_ERR(set)) |
| 3638 | return PTR_ERR(set); |
| 3639 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
| 3640 | return -EBUSY; |
| 3641 | |
| 3642 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
| 3643 | err = nft_del_setelem(&ctx, set, attr); |
| 3644 | if (err < 0) |
| 3645 | break; |
| 3646 | |
| 3647 | set->ndeact++; |
| 3648 | } |
| 3649 | return err; |
| 3650 | } |
| 3651 | |
| 3652 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
| 3653 | { |
| 3654 | struct nft_set_gc_batch *gcb; |
| 3655 | unsigned int i; |
| 3656 | |
| 3657 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); |
| 3658 | for (i = 0; i < gcb->head.cnt; i++) |
| 3659 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i]); |
| 3660 | kfree(gcb); |
| 3661 | } |
| 3662 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); |
| 3663 | |
| 3664 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, |
| 3665 | gfp_t gfp) |
| 3666 | { |
| 3667 | struct nft_set_gc_batch *gcb; |
| 3668 | |
| 3669 | gcb = kzalloc(sizeof(*gcb), gfp); |
| 3670 | if (gcb == NULL) |
| 3671 | return gcb; |
| 3672 | gcb->head.set = set; |
| 3673 | return gcb; |
| 3674 | } |
| 3675 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); |
| 3676 | |
| 3677 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
| 3678 | u32 portid, u32 seq) |
| 3679 | { |
| 3680 | struct nlmsghdr *nlh; |
| 3681 | struct nfgenmsg *nfmsg; |
| 3682 | int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN; |
| 3683 | |
| 3684 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); |
| 3685 | if (nlh == NULL) |
| 3686 | goto nla_put_failure; |
| 3687 | |
| 3688 | nfmsg = nlmsg_data(nlh); |
| 3689 | nfmsg->nfgen_family = AF_UNSPEC; |
| 3690 | nfmsg->version = NFNETLINK_V0; |
| 3691 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
| 3692 | |
| 3693 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq))) |
| 3694 | goto nla_put_failure; |
| 3695 | |
| 3696 | nlmsg_end(skb, nlh); |
| 3697 | return 0; |
| 3698 | |
| 3699 | nla_put_failure: |
| 3700 | nlmsg_trim(skb, nlh); |
| 3701 | return -EMSGSIZE; |
| 3702 | } |
| 3703 | |
| 3704 | static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event) |
| 3705 | { |
| 3706 | struct nlmsghdr *nlh = nlmsg_hdr(skb); |
| 3707 | struct sk_buff *skb2; |
| 3708 | int err; |
| 3709 | |
| 3710 | if (nlmsg_report(nlh) && |
| 3711 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
| 3712 | return 0; |
| 3713 | |
| 3714 | err = -ENOBUFS; |
| 3715 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 3716 | if (skb2 == NULL) |
| 3717 | goto err; |
| 3718 | |
| 3719 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, |
| 3720 | nlh->nlmsg_seq); |
| 3721 | if (err < 0) { |
| 3722 | kfree_skb(skb2); |
| 3723 | goto err; |
| 3724 | } |
| 3725 | |
| 3726 | err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, |
| 3727 | NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL); |
| 3728 | err: |
| 3729 | if (err < 0) { |
| 3730 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
| 3731 | err); |
| 3732 | } |
| 3733 | return err; |
| 3734 | } |
| 3735 | |
| 3736 | static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb, |
| 3737 | const struct nlmsghdr *nlh, |
| 3738 | const struct nlattr * const nla[]) |
| 3739 | { |
| 3740 | struct net *net = sock_net(skb->sk); |
| 3741 | struct sk_buff *skb2; |
| 3742 | int err; |
| 3743 | |
| 3744 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 3745 | if (skb2 == NULL) |
| 3746 | return -ENOMEM; |
| 3747 | |
| 3748 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, |
| 3749 | nlh->nlmsg_seq); |
| 3750 | if (err < 0) |
| 3751 | goto err; |
| 3752 | |
| 3753 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 3754 | err: |
| 3755 | kfree_skb(skb2); |
| 3756 | return err; |
| 3757 | } |
| 3758 | |
| 3759 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
| 3760 | [NFT_MSG_NEWTABLE] = { |
| 3761 | .call_batch = nf_tables_newtable, |
| 3762 | .attr_count = NFTA_TABLE_MAX, |
| 3763 | .policy = nft_table_policy, |
| 3764 | }, |
| 3765 | [NFT_MSG_GETTABLE] = { |
| 3766 | .call = nf_tables_gettable, |
| 3767 | .attr_count = NFTA_TABLE_MAX, |
| 3768 | .policy = nft_table_policy, |
| 3769 | }, |
| 3770 | [NFT_MSG_DELTABLE] = { |
| 3771 | .call_batch = nf_tables_deltable, |
| 3772 | .attr_count = NFTA_TABLE_MAX, |
| 3773 | .policy = nft_table_policy, |
| 3774 | }, |
| 3775 | [NFT_MSG_NEWCHAIN] = { |
| 3776 | .call_batch = nf_tables_newchain, |
| 3777 | .attr_count = NFTA_CHAIN_MAX, |
| 3778 | .policy = nft_chain_policy, |
| 3779 | }, |
| 3780 | [NFT_MSG_GETCHAIN] = { |
| 3781 | .call = nf_tables_getchain, |
| 3782 | .attr_count = NFTA_CHAIN_MAX, |
| 3783 | .policy = nft_chain_policy, |
| 3784 | }, |
| 3785 | [NFT_MSG_DELCHAIN] = { |
| 3786 | .call_batch = nf_tables_delchain, |
| 3787 | .attr_count = NFTA_CHAIN_MAX, |
| 3788 | .policy = nft_chain_policy, |
| 3789 | }, |
| 3790 | [NFT_MSG_NEWRULE] = { |
| 3791 | .call_batch = nf_tables_newrule, |
| 3792 | .attr_count = NFTA_RULE_MAX, |
| 3793 | .policy = nft_rule_policy, |
| 3794 | }, |
| 3795 | [NFT_MSG_GETRULE] = { |
| 3796 | .call = nf_tables_getrule, |
| 3797 | .attr_count = NFTA_RULE_MAX, |
| 3798 | .policy = nft_rule_policy, |
| 3799 | }, |
| 3800 | [NFT_MSG_DELRULE] = { |
| 3801 | .call_batch = nf_tables_delrule, |
| 3802 | .attr_count = NFTA_RULE_MAX, |
| 3803 | .policy = nft_rule_policy, |
| 3804 | }, |
| 3805 | [NFT_MSG_NEWSET] = { |
| 3806 | .call_batch = nf_tables_newset, |
| 3807 | .attr_count = NFTA_SET_MAX, |
| 3808 | .policy = nft_set_policy, |
| 3809 | }, |
| 3810 | [NFT_MSG_GETSET] = { |
| 3811 | .call = nf_tables_getset, |
| 3812 | .attr_count = NFTA_SET_MAX, |
| 3813 | .policy = nft_set_policy, |
| 3814 | }, |
| 3815 | [NFT_MSG_DELSET] = { |
| 3816 | .call_batch = nf_tables_delset, |
| 3817 | .attr_count = NFTA_SET_MAX, |
| 3818 | .policy = nft_set_policy, |
| 3819 | }, |
| 3820 | [NFT_MSG_NEWSETELEM] = { |
| 3821 | .call_batch = nf_tables_newsetelem, |
| 3822 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| 3823 | .policy = nft_set_elem_list_policy, |
| 3824 | }, |
| 3825 | [NFT_MSG_GETSETELEM] = { |
| 3826 | .call = nf_tables_getsetelem, |
| 3827 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| 3828 | .policy = nft_set_elem_list_policy, |
| 3829 | }, |
| 3830 | [NFT_MSG_DELSETELEM] = { |
| 3831 | .call_batch = nf_tables_delsetelem, |
| 3832 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| 3833 | .policy = nft_set_elem_list_policy, |
| 3834 | }, |
| 3835 | [NFT_MSG_GETGEN] = { |
| 3836 | .call = nf_tables_getgen, |
| 3837 | }, |
| 3838 | }; |
| 3839 | |
| 3840 | static void nft_chain_commit_update(struct nft_trans *trans) |
| 3841 | { |
| 3842 | struct nft_base_chain *basechain; |
| 3843 | |
| 3844 | if (nft_trans_chain_name(trans)[0]) |
| 3845 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); |
| 3846 | |
| 3847 | if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN)) |
| 3848 | return; |
| 3849 | |
| 3850 | basechain = nft_base_chain(trans->ctx.chain); |
| 3851 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); |
| 3852 | |
| 3853 | switch (nft_trans_chain_policy(trans)) { |
| 3854 | case NF_DROP: |
| 3855 | case NF_ACCEPT: |
| 3856 | basechain->policy = nft_trans_chain_policy(trans); |
| 3857 | break; |
| 3858 | } |
| 3859 | } |
| 3860 | |
| 3861 | static void nf_tables_commit_release(struct nft_trans *trans) |
| 3862 | { |
| 3863 | switch (trans->msg_type) { |
| 3864 | case NFT_MSG_DELTABLE: |
| 3865 | nf_tables_table_destroy(&trans->ctx); |
| 3866 | break; |
| 3867 | case NFT_MSG_DELCHAIN: |
| 3868 | nf_tables_chain_destroy(trans->ctx.chain); |
| 3869 | break; |
| 3870 | case NFT_MSG_DELRULE: |
| 3871 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); |
| 3872 | break; |
| 3873 | case NFT_MSG_DELSET: |
| 3874 | nft_set_destroy(nft_trans_set(trans)); |
| 3875 | break; |
| 3876 | case NFT_MSG_DELSETELEM: |
| 3877 | nft_set_elem_destroy(nft_trans_elem_set(trans), |
| 3878 | nft_trans_elem(trans).priv); |
| 3879 | break; |
| 3880 | } |
| 3881 | kfree(trans); |
| 3882 | } |
| 3883 | |
| 3884 | static int nf_tables_commit(struct sk_buff *skb) |
| 3885 | { |
| 3886 | struct net *net = sock_net(skb->sk); |
| 3887 | struct nft_trans *trans, *next; |
| 3888 | struct nft_trans_elem *te; |
| 3889 | |
| 3890 | /* Bump generation counter, invalidate any dump in progress */ |
| 3891 | while (++net->nft.base_seq == 0); |
| 3892 | |
| 3893 | /* A new generation has just started */ |
| 3894 | net->nft.gencursor = nft_gencursor_next(net); |
| 3895 | |
| 3896 | /* Make sure all packets have left the previous generation before |
| 3897 | * purging old rules. |
| 3898 | */ |
| 3899 | synchronize_rcu(); |
| 3900 | |
| 3901 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
| 3902 | switch (trans->msg_type) { |
| 3903 | case NFT_MSG_NEWTABLE: |
| 3904 | if (nft_trans_table_update(trans)) { |
| 3905 | if (!nft_trans_table_enable(trans)) { |
| 3906 | nf_tables_table_disable(trans->ctx.afi, |
| 3907 | trans->ctx.table); |
| 3908 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; |
| 3909 | } |
| 3910 | } else { |
| 3911 | trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE; |
| 3912 | } |
| 3913 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
| 3914 | nft_trans_destroy(trans); |
| 3915 | break; |
| 3916 | case NFT_MSG_DELTABLE: |
| 3917 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
| 3918 | break; |
| 3919 | case NFT_MSG_NEWCHAIN: |
| 3920 | if (nft_trans_chain_update(trans)) |
| 3921 | nft_chain_commit_update(trans); |
| 3922 | else |
| 3923 | trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE; |
| 3924 | |
| 3925 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
| 3926 | nft_trans_destroy(trans); |
| 3927 | break; |
| 3928 | case NFT_MSG_DELCHAIN: |
| 3929 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
| 3930 | nf_tables_unregister_hooks(trans->ctx.table, |
| 3931 | trans->ctx.chain, |
| 3932 | trans->ctx.afi->nops); |
| 3933 | break; |
| 3934 | case NFT_MSG_NEWRULE: |
| 3935 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); |
| 3936 | nf_tables_rule_notify(&trans->ctx, |
| 3937 | nft_trans_rule(trans), |
| 3938 | NFT_MSG_NEWRULE); |
| 3939 | nft_trans_destroy(trans); |
| 3940 | break; |
| 3941 | case NFT_MSG_DELRULE: |
| 3942 | list_del_rcu(&nft_trans_rule(trans)->list); |
| 3943 | nf_tables_rule_notify(&trans->ctx, |
| 3944 | nft_trans_rule(trans), |
| 3945 | NFT_MSG_DELRULE); |
| 3946 | break; |
| 3947 | case NFT_MSG_NEWSET: |
| 3948 | nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE; |
| 3949 | /* This avoids hitting -EBUSY when deleting the table |
| 3950 | * from the transaction. |
| 3951 | */ |
| 3952 | if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS && |
| 3953 | !list_empty(&nft_trans_set(trans)->bindings)) |
| 3954 | trans->ctx.table->use--; |
| 3955 | |
| 3956 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
| 3957 | NFT_MSG_NEWSET, GFP_KERNEL); |
| 3958 | nft_trans_destroy(trans); |
| 3959 | break; |
| 3960 | case NFT_MSG_DELSET: |
| 3961 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
| 3962 | NFT_MSG_DELSET, GFP_KERNEL); |
| 3963 | break; |
| 3964 | case NFT_MSG_NEWSETELEM: |
| 3965 | te = (struct nft_trans_elem *)trans->data; |
| 3966 | |
| 3967 | te->set->ops->activate(te->set, &te->elem); |
| 3968 | nf_tables_setelem_notify(&trans->ctx, te->set, |
| 3969 | &te->elem, |
| 3970 | NFT_MSG_NEWSETELEM, 0); |
| 3971 | nft_trans_destroy(trans); |
| 3972 | break; |
| 3973 | case NFT_MSG_DELSETELEM: |
| 3974 | te = (struct nft_trans_elem *)trans->data; |
| 3975 | |
| 3976 | nf_tables_setelem_notify(&trans->ctx, te->set, |
| 3977 | &te->elem, |
| 3978 | NFT_MSG_DELSETELEM, 0); |
| 3979 | te->set->ops->remove(te->set, &te->elem); |
| 3980 | atomic_dec(&te->set->nelems); |
| 3981 | te->set->ndeact--; |
| 3982 | break; |
| 3983 | } |
| 3984 | } |
| 3985 | |
| 3986 | synchronize_rcu(); |
| 3987 | |
| 3988 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
| 3989 | list_del(&trans->list); |
| 3990 | nf_tables_commit_release(trans); |
| 3991 | } |
| 3992 | |
| 3993 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); |
| 3994 | |
| 3995 | return 0; |
| 3996 | } |
| 3997 | |
| 3998 | static void nf_tables_abort_release(struct nft_trans *trans) |
| 3999 | { |
| 4000 | switch (trans->msg_type) { |
| 4001 | case NFT_MSG_NEWTABLE: |
| 4002 | nf_tables_table_destroy(&trans->ctx); |
| 4003 | break; |
| 4004 | case NFT_MSG_NEWCHAIN: |
| 4005 | nf_tables_chain_destroy(trans->ctx.chain); |
| 4006 | break; |
| 4007 | case NFT_MSG_NEWRULE: |
| 4008 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); |
| 4009 | break; |
| 4010 | case NFT_MSG_NEWSET: |
| 4011 | nft_set_destroy(nft_trans_set(trans)); |
| 4012 | break; |
| 4013 | case NFT_MSG_NEWSETELEM: |
| 4014 | nft_set_elem_destroy(nft_trans_elem_set(trans), |
| 4015 | nft_trans_elem(trans).priv); |
| 4016 | break; |
| 4017 | } |
| 4018 | kfree(trans); |
| 4019 | } |
| 4020 | |
| 4021 | static int nf_tables_abort(struct sk_buff *skb) |
| 4022 | { |
| 4023 | struct net *net = sock_net(skb->sk); |
| 4024 | struct nft_trans *trans, *next; |
| 4025 | struct nft_trans_elem *te; |
| 4026 | |
| 4027 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
| 4028 | list) { |
| 4029 | switch (trans->msg_type) { |
| 4030 | case NFT_MSG_NEWTABLE: |
| 4031 | if (nft_trans_table_update(trans)) { |
| 4032 | if (nft_trans_table_enable(trans)) { |
| 4033 | nf_tables_table_disable(trans->ctx.afi, |
| 4034 | trans->ctx.table); |
| 4035 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; |
| 4036 | } |
| 4037 | nft_trans_destroy(trans); |
| 4038 | } else { |
| 4039 | list_del_rcu(&trans->ctx.table->list); |
| 4040 | } |
| 4041 | break; |
| 4042 | case NFT_MSG_DELTABLE: |
| 4043 | list_add_tail_rcu(&trans->ctx.table->list, |
| 4044 | &trans->ctx.afi->tables); |
| 4045 | nft_trans_destroy(trans); |
| 4046 | break; |
| 4047 | case NFT_MSG_NEWCHAIN: |
| 4048 | if (nft_trans_chain_update(trans)) { |
| 4049 | free_percpu(nft_trans_chain_stats(trans)); |
| 4050 | |
| 4051 | nft_trans_destroy(trans); |
| 4052 | } else { |
| 4053 | trans->ctx.table->use--; |
| 4054 | list_del_rcu(&trans->ctx.chain->list); |
| 4055 | nf_tables_unregister_hooks(trans->ctx.table, |
| 4056 | trans->ctx.chain, |
| 4057 | trans->ctx.afi->nops); |
| 4058 | } |
| 4059 | break; |
| 4060 | case NFT_MSG_DELCHAIN: |
| 4061 | trans->ctx.table->use++; |
| 4062 | list_add_tail_rcu(&trans->ctx.chain->list, |
| 4063 | &trans->ctx.table->chains); |
| 4064 | nft_trans_destroy(trans); |
| 4065 | break; |
| 4066 | case NFT_MSG_NEWRULE: |
| 4067 | trans->ctx.chain->use--; |
| 4068 | list_del_rcu(&nft_trans_rule(trans)->list); |
| 4069 | break; |
| 4070 | case NFT_MSG_DELRULE: |
| 4071 | trans->ctx.chain->use++; |
| 4072 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); |
| 4073 | nft_trans_destroy(trans); |
| 4074 | break; |
| 4075 | case NFT_MSG_NEWSET: |
| 4076 | trans->ctx.table->use--; |
| 4077 | list_del_rcu(&nft_trans_set(trans)->list); |
| 4078 | break; |
| 4079 | case NFT_MSG_DELSET: |
| 4080 | trans->ctx.table->use++; |
| 4081 | list_add_tail_rcu(&nft_trans_set(trans)->list, |
| 4082 | &trans->ctx.table->sets); |
| 4083 | nft_trans_destroy(trans); |
| 4084 | break; |
| 4085 | case NFT_MSG_NEWSETELEM: |
| 4086 | te = (struct nft_trans_elem *)trans->data; |
| 4087 | |
| 4088 | te->set->ops->remove(te->set, &te->elem); |
| 4089 | atomic_dec(&te->set->nelems); |
| 4090 | break; |
| 4091 | case NFT_MSG_DELSETELEM: |
| 4092 | te = (struct nft_trans_elem *)trans->data; |
| 4093 | |
| 4094 | te->set->ops->activate(te->set, &te->elem); |
| 4095 | te->set->ndeact--; |
| 4096 | |
| 4097 | nft_trans_destroy(trans); |
| 4098 | break; |
| 4099 | } |
| 4100 | } |
| 4101 | |
| 4102 | synchronize_rcu(); |
| 4103 | |
| 4104 | list_for_each_entry_safe_reverse(trans, next, |
| 4105 | &net->nft.commit_list, list) { |
| 4106 | list_del(&trans->list); |
| 4107 | nf_tables_abort_release(trans); |
| 4108 | } |
| 4109 | |
| 4110 | return 0; |
| 4111 | } |
| 4112 | |
| 4113 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
| 4114 | .name = "nf_tables", |
| 4115 | .subsys_id = NFNL_SUBSYS_NFTABLES, |
| 4116 | .cb_count = NFT_MSG_MAX, |
| 4117 | .cb = nf_tables_cb, |
| 4118 | .commit = nf_tables_commit, |
| 4119 | .abort = nf_tables_abort, |
| 4120 | }; |
| 4121 | |
| 4122 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
| 4123 | enum nft_chain_type type) |
| 4124 | { |
| 4125 | const struct nft_base_chain *basechain; |
| 4126 | |
| 4127 | if (chain->flags & NFT_BASE_CHAIN) { |
| 4128 | basechain = nft_base_chain(chain); |
| 4129 | if (basechain->type->type != type) |
| 4130 | return -EOPNOTSUPP; |
| 4131 | } |
| 4132 | return 0; |
| 4133 | } |
| 4134 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); |
| 4135 | |
| 4136 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
| 4137 | unsigned int hook_flags) |
| 4138 | { |
| 4139 | struct nft_base_chain *basechain; |
| 4140 | |
| 4141 | if (chain->flags & NFT_BASE_CHAIN) { |
| 4142 | basechain = nft_base_chain(chain); |
| 4143 | |
| 4144 | if ((1 << basechain->ops[0].hooknum) & hook_flags) |
| 4145 | return 0; |
| 4146 | |
| 4147 | return -EOPNOTSUPP; |
| 4148 | } |
| 4149 | |
| 4150 | return 0; |
| 4151 | } |
| 4152 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); |
| 4153 | |
| 4154 | /* |
| 4155 | * Loop detection - walk through the ruleset beginning at the destination chain |
| 4156 | * of a new jump until either the source chain is reached (loop) or all |
| 4157 | * reachable chains have been traversed. |
| 4158 | * |
| 4159 | * The loop check is performed whenever a new jump verdict is added to an |
| 4160 | * expression or verdict map or a verdict map is bound to a new chain. |
| 4161 | */ |
| 4162 | |
| 4163 | static int nf_tables_check_loops(const struct nft_ctx *ctx, |
| 4164 | const struct nft_chain *chain); |
| 4165 | |
| 4166 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, |
| 4167 | const struct nft_set *set, |
| 4168 | const struct nft_set_iter *iter, |
| 4169 | const struct nft_set_elem *elem) |
| 4170 | { |
| 4171 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
| 4172 | const struct nft_data *data; |
| 4173 | |
| 4174 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
| 4175 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) |
| 4176 | return 0; |
| 4177 | |
| 4178 | data = nft_set_ext_data(ext); |
| 4179 | switch (data->verdict.code) { |
| 4180 | case NFT_JUMP: |
| 4181 | case NFT_GOTO: |
| 4182 | return nf_tables_check_loops(ctx, data->verdict.chain); |
| 4183 | default: |
| 4184 | return 0; |
| 4185 | } |
| 4186 | } |
| 4187 | |
| 4188 | static int nf_tables_check_loops(const struct nft_ctx *ctx, |
| 4189 | const struct nft_chain *chain) |
| 4190 | { |
| 4191 | const struct nft_rule *rule; |
| 4192 | const struct nft_expr *expr, *last; |
| 4193 | const struct nft_set *set; |
| 4194 | struct nft_set_binding *binding; |
| 4195 | struct nft_set_iter iter; |
| 4196 | |
| 4197 | if (ctx->chain == chain) |
| 4198 | return -ELOOP; |
| 4199 | |
| 4200 | list_for_each_entry(rule, &chain->rules, list) { |
| 4201 | nft_rule_for_each_expr(expr, last, rule) { |
| 4202 | const struct nft_data *data = NULL; |
| 4203 | int err; |
| 4204 | |
| 4205 | if (!expr->ops->validate) |
| 4206 | continue; |
| 4207 | |
| 4208 | err = expr->ops->validate(ctx, expr, &data); |
| 4209 | if (err < 0) |
| 4210 | return err; |
| 4211 | |
| 4212 | if (data == NULL) |
| 4213 | continue; |
| 4214 | |
| 4215 | switch (data->verdict.code) { |
| 4216 | case NFT_JUMP: |
| 4217 | case NFT_GOTO: |
| 4218 | err = nf_tables_check_loops(ctx, |
| 4219 | data->verdict.chain); |
| 4220 | if (err < 0) |
| 4221 | return err; |
| 4222 | default: |
| 4223 | break; |
| 4224 | } |
| 4225 | } |
| 4226 | } |
| 4227 | |
| 4228 | list_for_each_entry(set, &ctx->table->sets, list) { |
| 4229 | if (!(set->flags & NFT_SET_MAP) || |
| 4230 | set->dtype != NFT_DATA_VERDICT) |
| 4231 | continue; |
| 4232 | |
| 4233 | list_for_each_entry(binding, &set->bindings, list) { |
| 4234 | if (!(binding->flags & NFT_SET_MAP) || |
| 4235 | binding->chain != chain) |
| 4236 | continue; |
| 4237 | |
| 4238 | iter.skip = 0; |
| 4239 | iter.count = 0; |
| 4240 | iter.err = 0; |
| 4241 | iter.fn = nf_tables_loop_check_setelem; |
| 4242 | |
| 4243 | set->ops->walk(ctx, set, &iter); |
| 4244 | if (iter.err < 0) |
| 4245 | return iter.err; |
| 4246 | } |
| 4247 | } |
| 4248 | |
| 4249 | return 0; |
| 4250 | } |
| 4251 | |
| 4252 | /** |
| 4253 | * nft_parse_register - parse a register value from a netlink attribute |
| 4254 | * |
| 4255 | * @attr: netlink attribute |
| 4256 | * |
| 4257 | * Parse and translate a register value from a netlink attribute. |
| 4258 | * Registers used to be 128 bit wide, these register numbers will be |
| 4259 | * mapped to the corresponding 32 bit register numbers. |
| 4260 | */ |
| 4261 | unsigned int nft_parse_register(const struct nlattr *attr) |
| 4262 | { |
| 4263 | unsigned int reg; |
| 4264 | |
| 4265 | reg = ntohl(nla_get_be32(attr)); |
| 4266 | switch (reg) { |
| 4267 | case NFT_REG_VERDICT...NFT_REG_4: |
| 4268 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; |
| 4269 | default: |
| 4270 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; |
| 4271 | } |
| 4272 | } |
| 4273 | EXPORT_SYMBOL_GPL(nft_parse_register); |
| 4274 | |
| 4275 | /** |
| 4276 | * nft_dump_register - dump a register value to a netlink attribute |
| 4277 | * |
| 4278 | * @skb: socket buffer |
| 4279 | * @attr: attribute number |
| 4280 | * @reg: register number |
| 4281 | * |
| 4282 | * Construct a netlink attribute containing the register number. For |
| 4283 | * compatibility reasons, register numbers being a multiple of 4 are |
| 4284 | * translated to the corresponding 128 bit register numbers. |
| 4285 | */ |
| 4286 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
| 4287 | { |
| 4288 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
| 4289 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); |
| 4290 | else |
| 4291 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; |
| 4292 | |
| 4293 | return nla_put_be32(skb, attr, htonl(reg)); |
| 4294 | } |
| 4295 | EXPORT_SYMBOL_GPL(nft_dump_register); |
| 4296 | |
| 4297 | /** |
| 4298 | * nft_validate_register_load - validate a load from a register |
| 4299 | * |
| 4300 | * @reg: the register number |
| 4301 | * @len: the length of the data |
| 4302 | * |
| 4303 | * Validate that the input register is one of the general purpose |
| 4304 | * registers and that the length of the load is within the bounds. |
| 4305 | */ |
| 4306 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
| 4307 | { |
| 4308 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
| 4309 | return -EINVAL; |
| 4310 | if (len == 0) |
| 4311 | return -EINVAL; |
| 4312 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
| 4313 | return -ERANGE; |
| 4314 | |
| 4315 | return 0; |
| 4316 | } |
| 4317 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
| 4318 | |
| 4319 | /** |
| 4320 | * nft_validate_register_store - validate an expressions' register store |
| 4321 | * |
| 4322 | * @ctx: context of the expression performing the load |
| 4323 | * @reg: the destination register number |
| 4324 | * @data: the data to load |
| 4325 | * @type: the data type |
| 4326 | * @len: the length of the data |
| 4327 | * |
| 4328 | * Validate that a data load uses the appropriate data type for |
| 4329 | * the destination register and the length is within the bounds. |
| 4330 | * A value of NULL for the data means that its runtime gathered |
| 4331 | * data. |
| 4332 | */ |
| 4333 | int nft_validate_register_store(const struct nft_ctx *ctx, |
| 4334 | enum nft_registers reg, |
| 4335 | const struct nft_data *data, |
| 4336 | enum nft_data_types type, unsigned int len) |
| 4337 | { |
| 4338 | int err; |
| 4339 | |
| 4340 | switch (reg) { |
| 4341 | case NFT_REG_VERDICT: |
| 4342 | if (type != NFT_DATA_VERDICT) |
| 4343 | return -EINVAL; |
| 4344 | |
| 4345 | if (data != NULL && |
| 4346 | (data->verdict.code == NFT_GOTO || |
| 4347 | data->verdict.code == NFT_JUMP)) { |
| 4348 | err = nf_tables_check_loops(ctx, data->verdict.chain); |
| 4349 | if (err < 0) |
| 4350 | return err; |
| 4351 | |
| 4352 | if (ctx->chain->level + 1 > |
| 4353 | data->verdict.chain->level) { |
| 4354 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
| 4355 | return -EMLINK; |
| 4356 | data->verdict.chain->level = ctx->chain->level + 1; |
| 4357 | } |
| 4358 | } |
| 4359 | |
| 4360 | return 0; |
| 4361 | default: |
| 4362 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
| 4363 | return -EINVAL; |
| 4364 | if (len == 0) |
| 4365 | return -EINVAL; |
| 4366 | if (reg * NFT_REG32_SIZE + len > |
| 4367 | FIELD_SIZEOF(struct nft_regs, data)) |
| 4368 | return -ERANGE; |
| 4369 | |
| 4370 | if (data != NULL && type != NFT_DATA_VALUE) |
| 4371 | return -EINVAL; |
| 4372 | return 0; |
| 4373 | } |
| 4374 | } |
| 4375 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
| 4376 | |
| 4377 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { |
| 4378 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, |
| 4379 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, |
| 4380 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, |
| 4381 | }; |
| 4382 | |
| 4383 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, |
| 4384 | struct nft_data_desc *desc, const struct nlattr *nla) |
| 4385 | { |
| 4386 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
| 4387 | struct nft_chain *chain; |
| 4388 | int err; |
| 4389 | |
| 4390 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); |
| 4391 | if (err < 0) |
| 4392 | return err; |
| 4393 | |
| 4394 | if (!tb[NFTA_VERDICT_CODE]) |
| 4395 | return -EINVAL; |
| 4396 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
| 4397 | |
| 4398 | switch (data->verdict.code) { |
| 4399 | default: |
| 4400 | switch (data->verdict.code & NF_VERDICT_MASK) { |
| 4401 | case NF_ACCEPT: |
| 4402 | case NF_DROP: |
| 4403 | case NF_QUEUE: |
| 4404 | break; |
| 4405 | default: |
| 4406 | return -EINVAL; |
| 4407 | } |
| 4408 | /* fall through */ |
| 4409 | case NFT_CONTINUE: |
| 4410 | case NFT_BREAK: |
| 4411 | case NFT_RETURN: |
| 4412 | break; |
| 4413 | case NFT_JUMP: |
| 4414 | case NFT_GOTO: |
| 4415 | if (!tb[NFTA_VERDICT_CHAIN]) |
| 4416 | return -EINVAL; |
| 4417 | chain = nf_tables_chain_lookup(ctx->table, |
| 4418 | tb[NFTA_VERDICT_CHAIN]); |
| 4419 | if (IS_ERR(chain)) |
| 4420 | return PTR_ERR(chain); |
| 4421 | if (chain->flags & NFT_BASE_CHAIN) |
| 4422 | return -EOPNOTSUPP; |
| 4423 | |
| 4424 | chain->use++; |
| 4425 | data->verdict.chain = chain; |
| 4426 | break; |
| 4427 | } |
| 4428 | |
| 4429 | desc->len = sizeof(data->verdict); |
| 4430 | desc->type = NFT_DATA_VERDICT; |
| 4431 | return 0; |
| 4432 | } |
| 4433 | |
| 4434 | static void nft_verdict_uninit(const struct nft_data *data) |
| 4435 | { |
| 4436 | switch (data->verdict.code) { |
| 4437 | case NFT_JUMP: |
| 4438 | case NFT_GOTO: |
| 4439 | data->verdict.chain->use--; |
| 4440 | break; |
| 4441 | } |
| 4442 | } |
| 4443 | |
| 4444 | static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) |
| 4445 | { |
| 4446 | struct nlattr *nest; |
| 4447 | |
| 4448 | nest = nla_nest_start(skb, NFTA_DATA_VERDICT); |
| 4449 | if (!nest) |
| 4450 | goto nla_put_failure; |
| 4451 | |
| 4452 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict.code))) |
| 4453 | goto nla_put_failure; |
| 4454 | |
| 4455 | switch (data->verdict.code) { |
| 4456 | case NFT_JUMP: |
| 4457 | case NFT_GOTO: |
| 4458 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
| 4459 | data->verdict.chain->name)) |
| 4460 | goto nla_put_failure; |
| 4461 | } |
| 4462 | nla_nest_end(skb, nest); |
| 4463 | return 0; |
| 4464 | |
| 4465 | nla_put_failure: |
| 4466 | return -1; |
| 4467 | } |
| 4468 | |
| 4469 | static int nft_value_init(const struct nft_ctx *ctx, |
| 4470 | struct nft_data *data, unsigned int size, |
| 4471 | struct nft_data_desc *desc, const struct nlattr *nla) |
| 4472 | { |
| 4473 | unsigned int len; |
| 4474 | |
| 4475 | len = nla_len(nla); |
| 4476 | if (len == 0) |
| 4477 | return -EINVAL; |
| 4478 | if (len > size) |
| 4479 | return -EOVERFLOW; |
| 4480 | |
| 4481 | nla_memcpy(data->data, nla, len); |
| 4482 | desc->type = NFT_DATA_VALUE; |
| 4483 | desc->len = len; |
| 4484 | return 0; |
| 4485 | } |
| 4486 | |
| 4487 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, |
| 4488 | unsigned int len) |
| 4489 | { |
| 4490 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); |
| 4491 | } |
| 4492 | |
| 4493 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { |
| 4494 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
| 4495 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
| 4496 | }; |
| 4497 | |
| 4498 | /** |
| 4499 | * nft_data_init - parse nf_tables data netlink attributes |
| 4500 | * |
| 4501 | * @ctx: context of the expression using the data |
| 4502 | * @data: destination struct nft_data |
| 4503 | * @size: maximum data length |
| 4504 | * @desc: data description |
| 4505 | * @nla: netlink attribute containing data |
| 4506 | * |
| 4507 | * Parse the netlink data attributes and initialize a struct nft_data. |
| 4508 | * The type and length of data are returned in the data description. |
| 4509 | * |
| 4510 | * The caller can indicate that it only wants to accept data of type |
| 4511 | * NFT_DATA_VALUE by passing NULL for the ctx argument. |
| 4512 | */ |
| 4513 | int nft_data_init(const struct nft_ctx *ctx, |
| 4514 | struct nft_data *data, unsigned int size, |
| 4515 | struct nft_data_desc *desc, const struct nlattr *nla) |
| 4516 | { |
| 4517 | struct nlattr *tb[NFTA_DATA_MAX + 1]; |
| 4518 | int err; |
| 4519 | |
| 4520 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); |
| 4521 | if (err < 0) |
| 4522 | return err; |
| 4523 | |
| 4524 | if (tb[NFTA_DATA_VALUE]) |
| 4525 | return nft_value_init(ctx, data, size, desc, |
| 4526 | tb[NFTA_DATA_VALUE]); |
| 4527 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
| 4528 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); |
| 4529 | return -EINVAL; |
| 4530 | } |
| 4531 | EXPORT_SYMBOL_GPL(nft_data_init); |
| 4532 | |
| 4533 | /** |
| 4534 | * nft_data_uninit - release a nft_data item |
| 4535 | * |
| 4536 | * @data: struct nft_data to release |
| 4537 | * @type: type of data |
| 4538 | * |
| 4539 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, |
| 4540 | * all others need to be released by calling this function. |
| 4541 | */ |
| 4542 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) |
| 4543 | { |
| 4544 | if (type < NFT_DATA_VERDICT) |
| 4545 | return; |
| 4546 | switch (type) { |
| 4547 | case NFT_DATA_VERDICT: |
| 4548 | return nft_verdict_uninit(data); |
| 4549 | default: |
| 4550 | WARN_ON(1); |
| 4551 | } |
| 4552 | } |
| 4553 | EXPORT_SYMBOL_GPL(nft_data_uninit); |
| 4554 | |
| 4555 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, |
| 4556 | enum nft_data_types type, unsigned int len) |
| 4557 | { |
| 4558 | struct nlattr *nest; |
| 4559 | int err; |
| 4560 | |
| 4561 | nest = nla_nest_start(skb, attr); |
| 4562 | if (nest == NULL) |
| 4563 | return -1; |
| 4564 | |
| 4565 | switch (type) { |
| 4566 | case NFT_DATA_VALUE: |
| 4567 | err = nft_value_dump(skb, data, len); |
| 4568 | break; |
| 4569 | case NFT_DATA_VERDICT: |
| 4570 | err = nft_verdict_dump(skb, data); |
| 4571 | break; |
| 4572 | default: |
| 4573 | err = -EINVAL; |
| 4574 | WARN_ON(1); |
| 4575 | } |
| 4576 | |
| 4577 | nla_nest_end(skb, nest); |
| 4578 | return err; |
| 4579 | } |
| 4580 | EXPORT_SYMBOL_GPL(nft_data_dump); |
| 4581 | |
| 4582 | static int nf_tables_init_net(struct net *net) |
| 4583 | { |
| 4584 | INIT_LIST_HEAD(&net->nft.af_info); |
| 4585 | INIT_LIST_HEAD(&net->nft.commit_list); |
| 4586 | net->nft.base_seq = 1; |
| 4587 | return 0; |
| 4588 | } |
| 4589 | |
| 4590 | static struct pernet_operations nf_tables_net_ops = { |
| 4591 | .init = nf_tables_init_net, |
| 4592 | }; |
| 4593 | |
| 4594 | static int __init nf_tables_module_init(void) |
| 4595 | { |
| 4596 | int err; |
| 4597 | |
| 4598 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, |
| 4599 | GFP_KERNEL); |
| 4600 | if (info == NULL) { |
| 4601 | err = -ENOMEM; |
| 4602 | goto err1; |
| 4603 | } |
| 4604 | |
| 4605 | err = nf_tables_core_module_init(); |
| 4606 | if (err < 0) |
| 4607 | goto err2; |
| 4608 | |
| 4609 | err = nfnetlink_subsys_register(&nf_tables_subsys); |
| 4610 | if (err < 0) |
| 4611 | goto err3; |
| 4612 | |
| 4613 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); |
| 4614 | return register_pernet_subsys(&nf_tables_net_ops); |
| 4615 | err3: |
| 4616 | nf_tables_core_module_exit(); |
| 4617 | err2: |
| 4618 | kfree(info); |
| 4619 | err1: |
| 4620 | return err; |
| 4621 | } |
| 4622 | |
| 4623 | static void __exit nf_tables_module_exit(void) |
| 4624 | { |
| 4625 | unregister_pernet_subsys(&nf_tables_net_ops); |
| 4626 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
| 4627 | rcu_barrier(); |
| 4628 | nf_tables_core_module_exit(); |
| 4629 | kfree(info); |
| 4630 | } |
| 4631 | |
| 4632 | module_init(nf_tables_module_init); |
| 4633 | module_exit(nf_tables_module_exit); |
| 4634 | |
| 4635 | MODULE_LICENSE("GPL"); |
| 4636 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 4637 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |