Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1 | /* |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2 | * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 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> |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 21 | #include <net/net_namespace.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 22 | #include <net/sock.h> |
| 23 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 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 | */ |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 34 | int nft_register_afinfo(struct net *net, struct nft_af_info *afi) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 35 | { |
| 36 | INIT_LIST_HEAD(&afi->tables); |
| 37 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 38 | list_add_tail_rcu(&afi->list, &net->nft.af_info); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 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); |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 54 | list_del_rcu(&afi->list); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 55 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 56 | } |
| 57 | EXPORT_SYMBOL_GPL(nft_unregister_afinfo); |
| 58 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 59 | static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 60 | { |
| 61 | struct nft_af_info *afi; |
| 62 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 63 | list_for_each_entry(afi, &net->nft.af_info, list) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 64 | if (afi->family == family) |
| 65 | return afi; |
| 66 | } |
| 67 | return NULL; |
| 68 | } |
| 69 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 70 | static struct nft_af_info * |
| 71 | nf_tables_afinfo_lookup(struct net *net, int family, bool autoload) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 72 | { |
| 73 | struct nft_af_info *afi; |
| 74 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 75 | afi = nft_afinfo_lookup(net, family); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 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); |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 83 | afi = nft_afinfo_lookup(net, family); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 84 | if (afi != NULL) |
| 85 | return ERR_PTR(-EAGAIN); |
| 86 | } |
| 87 | #endif |
| 88 | return ERR_PTR(-EAFNOSUPPORT); |
| 89 | } |
| 90 | |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 91 | static void nft_ctx_init(struct nft_ctx *ctx, |
| 92 | const struct sk_buff *skb, |
| 93 | const struct nlmsghdr *nlh, |
| 94 | struct nft_af_info *afi, |
| 95 | struct nft_table *table, |
| 96 | struct nft_chain *chain, |
| 97 | const struct nlattr * const *nla) |
| 98 | { |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 99 | ctx->net = sock_net(skb->sk); |
| 100 | ctx->afi = afi; |
| 101 | ctx->table = table; |
| 102 | ctx->chain = chain; |
| 103 | ctx->nla = nla; |
| 104 | ctx->portid = NETLINK_CB(skb).portid; |
| 105 | ctx->report = nlmsg_report(nlh); |
| 106 | ctx->seq = nlh->nlmsg_seq; |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 107 | } |
| 108 | |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 109 | static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type, |
| 110 | u32 size) |
Pablo Neira Ayuso | 1081d11 | 2014-04-04 01:24:07 +0200 | [diff] [blame] | 111 | { |
| 112 | struct nft_trans *trans; |
| 113 | |
| 114 | trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL); |
| 115 | if (trans == NULL) |
| 116 | return NULL; |
| 117 | |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 118 | trans->msg_type = msg_type; |
Pablo Neira Ayuso | 1081d11 | 2014-04-04 01:24:07 +0200 | [diff] [blame] | 119 | trans->ctx = *ctx; |
| 120 | |
| 121 | return trans; |
| 122 | } |
| 123 | |
| 124 | static void nft_trans_destroy(struct nft_trans *trans) |
| 125 | { |
| 126 | list_del(&trans->list); |
| 127 | kfree(trans); |
| 128 | } |
| 129 | |
Arturo Borrero | c559879 | 2014-09-02 16:42:23 +0200 | [diff] [blame] | 130 | static void nf_tables_unregister_hooks(const struct nft_table *table, |
| 131 | const struct nft_chain *chain, |
| 132 | unsigned int hook_nops) |
| 133 | { |
| 134 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
| 135 | chain->flags & NFT_BASE_CHAIN) |
| 136 | nf_unregister_hooks(nft_base_chain(chain)->ops, hook_nops); |
| 137 | } |
| 138 | |
Arturo Borrero | ee01d54 | 2014-09-02 16:42:25 +0200 | [diff] [blame] | 139 | /* Internal table flags */ |
| 140 | #define NFT_TABLE_INACTIVE (1 << 15) |
| 141 | |
| 142 | static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) |
| 143 | { |
| 144 | struct nft_trans *trans; |
| 145 | |
| 146 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); |
| 147 | if (trans == NULL) |
| 148 | return -ENOMEM; |
| 149 | |
| 150 | if (msg_type == NFT_MSG_NEWTABLE) |
| 151 | ctx->table->flags |= NFT_TABLE_INACTIVE; |
| 152 | |
| 153 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | static int nft_deltable(struct nft_ctx *ctx) |
| 158 | { |
| 159 | int err; |
| 160 | |
| 161 | err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); |
| 162 | if (err < 0) |
| 163 | return err; |
| 164 | |
| 165 | list_del_rcu(&ctx->table->list); |
| 166 | return err; |
| 167 | } |
| 168 | |
| 169 | static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) |
| 170 | { |
| 171 | struct nft_trans *trans; |
| 172 | |
| 173 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); |
| 174 | if (trans == NULL) |
| 175 | return -ENOMEM; |
| 176 | |
| 177 | if (msg_type == NFT_MSG_NEWCHAIN) |
| 178 | ctx->chain->flags |= NFT_CHAIN_INACTIVE; |
| 179 | |
| 180 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | static int nft_delchain(struct nft_ctx *ctx) |
| 185 | { |
| 186 | int err; |
| 187 | |
| 188 | err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); |
| 189 | if (err < 0) |
| 190 | return err; |
| 191 | |
| 192 | ctx->table->use--; |
| 193 | list_del_rcu(&ctx->chain->list); |
| 194 | |
| 195 | return err; |
| 196 | } |
| 197 | |
| 198 | static inline bool |
| 199 | nft_rule_is_active(struct net *net, const struct nft_rule *rule) |
| 200 | { |
| 201 | return (rule->genmask & (1 << net->nft.gencursor)) == 0; |
| 202 | } |
| 203 | |
| 204 | static inline int gencursor_next(struct net *net) |
| 205 | { |
| 206 | return net->nft.gencursor+1 == 1 ? 1 : 0; |
| 207 | } |
| 208 | |
| 209 | static inline int |
| 210 | nft_rule_is_active_next(struct net *net, const struct nft_rule *rule) |
| 211 | { |
| 212 | return (rule->genmask & (1 << gencursor_next(net))) == 0; |
| 213 | } |
| 214 | |
| 215 | static inline void |
| 216 | nft_rule_activate_next(struct net *net, struct nft_rule *rule) |
| 217 | { |
| 218 | /* Now inactive, will be active in the future */ |
| 219 | rule->genmask = (1 << net->nft.gencursor); |
| 220 | } |
| 221 | |
| 222 | static inline void |
| 223 | nft_rule_deactivate_next(struct net *net, struct nft_rule *rule) |
| 224 | { |
| 225 | rule->genmask = (1 << gencursor_next(net)); |
| 226 | } |
| 227 | |
| 228 | static inline void nft_rule_clear(struct net *net, struct nft_rule *rule) |
| 229 | { |
| 230 | rule->genmask = 0; |
| 231 | } |
| 232 | |
| 233 | static int |
| 234 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) |
| 235 | { |
| 236 | /* You cannot delete the same rule twice */ |
| 237 | if (nft_rule_is_active_next(ctx->net, rule)) { |
| 238 | nft_rule_deactivate_next(ctx->net, rule); |
| 239 | ctx->chain->use--; |
| 240 | return 0; |
| 241 | } |
| 242 | return -ENOENT; |
| 243 | } |
| 244 | |
| 245 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, |
| 246 | struct nft_rule *rule) |
| 247 | { |
| 248 | struct nft_trans *trans; |
| 249 | |
| 250 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); |
| 251 | if (trans == NULL) |
| 252 | return NULL; |
| 253 | |
| 254 | nft_trans_rule(trans) = rule; |
| 255 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 256 | |
| 257 | return trans; |
| 258 | } |
| 259 | |
| 260 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) |
| 261 | { |
| 262 | struct nft_trans *trans; |
| 263 | int err; |
| 264 | |
| 265 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); |
| 266 | if (trans == NULL) |
| 267 | return -ENOMEM; |
| 268 | |
| 269 | err = nf_tables_delrule_deactivate(ctx, rule); |
| 270 | if (err < 0) { |
| 271 | nft_trans_destroy(trans); |
| 272 | return err; |
| 273 | } |
| 274 | |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | static int nft_delrule_by_chain(struct nft_ctx *ctx) |
| 279 | { |
| 280 | struct nft_rule *rule; |
| 281 | int err; |
| 282 | |
| 283 | list_for_each_entry(rule, &ctx->chain->rules, list) { |
| 284 | err = nft_delrule(ctx, rule); |
| 285 | if (err < 0) |
| 286 | return err; |
| 287 | } |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | /* Internal set flag */ |
| 292 | #define NFT_SET_INACTIVE (1 << 15) |
| 293 | |
| 294 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, |
| 295 | struct nft_set *set) |
| 296 | { |
| 297 | struct nft_trans *trans; |
| 298 | |
| 299 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); |
| 300 | if (trans == NULL) |
| 301 | return -ENOMEM; |
| 302 | |
| 303 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { |
| 304 | nft_trans_set_id(trans) = |
| 305 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); |
| 306 | set->flags |= NFT_SET_INACTIVE; |
| 307 | } |
| 308 | nft_trans_set(trans) = set; |
| 309 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 310 | |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | static int nft_delset(struct nft_ctx *ctx, struct nft_set *set) |
| 315 | { |
| 316 | int err; |
| 317 | |
| 318 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); |
| 319 | if (err < 0) |
| 320 | return err; |
| 321 | |
| 322 | list_del_rcu(&set->list); |
| 323 | ctx->table->use--; |
| 324 | |
| 325 | return err; |
| 326 | } |
| 327 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 328 | /* |
| 329 | * Tables |
| 330 | */ |
| 331 | |
| 332 | static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, |
| 333 | const struct nlattr *nla) |
| 334 | { |
| 335 | struct nft_table *table; |
| 336 | |
| 337 | list_for_each_entry(table, &afi->tables, list) { |
| 338 | if (!nla_strcmp(nla, table->name)) |
| 339 | return table; |
| 340 | } |
| 341 | return NULL; |
| 342 | } |
| 343 | |
| 344 | static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 345 | const struct nlattr *nla) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 346 | { |
| 347 | struct nft_table *table; |
| 348 | |
| 349 | if (nla == NULL) |
| 350 | return ERR_PTR(-EINVAL); |
| 351 | |
| 352 | table = nft_table_lookup(afi, nla); |
| 353 | if (table != NULL) |
| 354 | return table; |
| 355 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 356 | return ERR_PTR(-ENOENT); |
| 357 | } |
| 358 | |
| 359 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) |
| 360 | { |
| 361 | return ++table->hgenerator; |
| 362 | } |
| 363 | |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 364 | static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX]; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 365 | |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 366 | static const struct nf_chain_type * |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 367 | __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 368 | { |
| 369 | int i; |
| 370 | |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 371 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 372 | if (chain_type[family][i] != NULL && |
| 373 | !nla_strcmp(nla, chain_type[family][i]->name)) |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 374 | return chain_type[family][i]; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 375 | } |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 376 | return NULL; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 377 | } |
| 378 | |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 379 | static const struct nf_chain_type * |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 380 | nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
| 381 | const struct nlattr *nla, |
| 382 | bool autoload) |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 383 | { |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 384 | const struct nf_chain_type *type; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 385 | |
| 386 | type = __nf_tables_chain_type_lookup(afi->family, nla); |
Patrick McHardy | 93b0806 | 2014-01-09 18:42:36 +0000 | [diff] [blame] | 387 | if (type != NULL) |
| 388 | return type; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 389 | #ifdef CONFIG_MODULES |
Patrick McHardy | 93b0806 | 2014-01-09 18:42:36 +0000 | [diff] [blame] | 390 | if (autoload) { |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 391 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | 2fec6bb | 2014-03-31 12:26:39 +0200 | [diff] [blame] | 392 | request_module("nft-chain-%u-%.*s", afi->family, |
| 393 | nla_len(nla), (const char *)nla_data(nla)); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 394 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 395 | type = __nf_tables_chain_type_lookup(afi->family, nla); |
Patrick McHardy | 93b0806 | 2014-01-09 18:42:36 +0000 | [diff] [blame] | 396 | if (type != NULL) |
| 397 | return ERR_PTR(-EAGAIN); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 398 | } |
| 399 | #endif |
Patrick McHardy | 93b0806 | 2014-01-09 18:42:36 +0000 | [diff] [blame] | 400 | return ERR_PTR(-ENOENT); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 401 | } |
| 402 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 403 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
Pablo Neira Ayuso | 1cae565 | 2015-03-05 15:05:36 +0100 | [diff] [blame^] | 404 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
| 405 | .len = NFT_TABLE_MAXNAMELEN - 1 }, |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 406 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 407 | }; |
| 408 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 409 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
| 410 | u32 portid, u32 seq, int event, u32 flags, |
| 411 | int family, const struct nft_table *table) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 412 | { |
| 413 | struct nlmsghdr *nlh; |
| 414 | struct nfgenmsg *nfmsg; |
| 415 | |
| 416 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 417 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
| 418 | if (nlh == NULL) |
| 419 | goto nla_put_failure; |
| 420 | |
| 421 | nfmsg = nlmsg_data(nlh); |
| 422 | nfmsg->nfgen_family = family; |
| 423 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 424 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 425 | |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 426 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
Tomasz Bursztyka | d8bcc768 | 2013-12-12 15:00:42 +0200 | [diff] [blame] | 427 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
| 428 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 429 | goto nla_put_failure; |
| 430 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 431 | nlmsg_end(skb, nlh); |
| 432 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 433 | |
| 434 | nla_put_failure: |
| 435 | nlmsg_trim(skb, nlh); |
| 436 | return -1; |
| 437 | } |
| 438 | |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 439 | static int nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 440 | { |
| 441 | struct sk_buff *skb; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 442 | int err; |
| 443 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 444 | if (!ctx->report && |
| 445 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 446 | return 0; |
| 447 | |
| 448 | err = -ENOBUFS; |
| 449 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 450 | if (skb == NULL) |
| 451 | goto err; |
| 452 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 453 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
| 454 | event, 0, ctx->afi->family, ctx->table); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 455 | if (err < 0) { |
| 456 | kfree_skb(skb); |
| 457 | goto err; |
| 458 | } |
| 459 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 460 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 461 | ctx->report, GFP_KERNEL); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 462 | err: |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 463 | if (err < 0) { |
| 464 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 465 | err); |
| 466 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 467 | return err; |
| 468 | } |
| 469 | |
| 470 | static int nf_tables_dump_tables(struct sk_buff *skb, |
| 471 | struct netlink_callback *cb) |
| 472 | { |
| 473 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
| 474 | const struct nft_af_info *afi; |
| 475 | const struct nft_table *table; |
| 476 | unsigned int idx = 0, s_idx = cb->args[0]; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 477 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 478 | int family = nfmsg->nfgen_family; |
| 479 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 480 | rcu_read_lock(); |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 481 | cb->seq = net->nft.base_seq; |
| 482 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 483 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 484 | if (family != NFPROTO_UNSPEC && family != afi->family) |
| 485 | continue; |
| 486 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 487 | list_for_each_entry_rcu(table, &afi->tables, list) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 488 | if (idx < s_idx) |
| 489 | goto cont; |
| 490 | if (idx > s_idx) |
| 491 | memset(&cb->args[1], 0, |
| 492 | sizeof(cb->args) - sizeof(cb->args[0])); |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 493 | if (nf_tables_fill_table_info(skb, net, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 494 | NETLINK_CB(cb->skb).portid, |
| 495 | cb->nlh->nlmsg_seq, |
| 496 | NFT_MSG_NEWTABLE, |
| 497 | NLM_F_MULTI, |
| 498 | afi->family, table) < 0) |
| 499 | goto done; |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 500 | |
| 501 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 502 | cont: |
| 503 | idx++; |
| 504 | } |
| 505 | } |
| 506 | done: |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 507 | rcu_read_unlock(); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 508 | cb->args[0] = idx; |
| 509 | return skb->len; |
| 510 | } |
| 511 | |
| 512 | static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb, |
| 513 | const struct nlmsghdr *nlh, |
| 514 | const struct nlattr * const nla[]) |
| 515 | { |
| 516 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 517 | const struct nft_af_info *afi; |
| 518 | const struct nft_table *table; |
| 519 | struct sk_buff *skb2; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 520 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 521 | int family = nfmsg->nfgen_family; |
| 522 | int err; |
| 523 | |
| 524 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 525 | struct netlink_dump_control c = { |
| 526 | .dump = nf_tables_dump_tables, |
| 527 | }; |
| 528 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 529 | } |
| 530 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 531 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 532 | if (IS_ERR(afi)) |
| 533 | return PTR_ERR(afi); |
| 534 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 535 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 536 | if (IS_ERR(table)) |
| 537 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 538 | if (table->flags & NFT_TABLE_INACTIVE) |
| 539 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 540 | |
| 541 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 542 | if (!skb2) |
| 543 | return -ENOMEM; |
| 544 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 545 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 546 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
| 547 | family, table); |
| 548 | if (err < 0) |
| 549 | goto err; |
| 550 | |
| 551 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 552 | |
| 553 | err: |
| 554 | kfree_skb(skb2); |
| 555 | return err; |
| 556 | } |
| 557 | |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 558 | static int nf_tables_table_enable(const struct nft_af_info *afi, |
| 559 | struct nft_table *table) |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 560 | { |
| 561 | struct nft_chain *chain; |
| 562 | int err, i = 0; |
| 563 | |
| 564 | list_for_each_entry(chain, &table->chains, list) { |
Pablo Neira Ayuso | d201297 | 2013-12-27 10:44:23 +0100 | [diff] [blame] | 565 | if (!(chain->flags & NFT_BASE_CHAIN)) |
| 566 | continue; |
| 567 | |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 568 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 569 | if (err < 0) |
| 570 | goto err; |
| 571 | |
| 572 | i++; |
| 573 | } |
| 574 | return 0; |
| 575 | err: |
| 576 | list_for_each_entry(chain, &table->chains, list) { |
Pablo Neira Ayuso | d201297 | 2013-12-27 10:44:23 +0100 | [diff] [blame] | 577 | if (!(chain->flags & NFT_BASE_CHAIN)) |
| 578 | continue; |
| 579 | |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 580 | if (i-- <= 0) |
| 581 | break; |
| 582 | |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 583 | nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 584 | } |
| 585 | return err; |
| 586 | } |
| 587 | |
Pablo Neira Ayuso | f75edf5 | 2014-03-30 14:04:52 +0200 | [diff] [blame] | 588 | static void nf_tables_table_disable(const struct nft_af_info *afi, |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 589 | struct nft_table *table) |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 590 | { |
| 591 | struct nft_chain *chain; |
| 592 | |
Pablo Neira Ayuso | d201297 | 2013-12-27 10:44:23 +0100 | [diff] [blame] | 593 | list_for_each_entry(chain, &table->chains, list) { |
| 594 | if (chain->flags & NFT_BASE_CHAIN) |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 595 | nf_unregister_hooks(nft_base_chain(chain)->ops, |
| 596 | afi->nops); |
Pablo Neira Ayuso | d201297 | 2013-12-27 10:44:23 +0100 | [diff] [blame] | 597 | } |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 598 | } |
| 599 | |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 600 | static int nf_tables_updtable(struct nft_ctx *ctx) |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 601 | { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 602 | struct nft_trans *trans; |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 603 | u32 flags; |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 604 | int ret = 0; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 605 | |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 606 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
| 607 | return 0; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 608 | |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 609 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
| 610 | if (flags & ~NFT_TABLE_F_DORMANT) |
| 611 | return -EINVAL; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 612 | |
Pablo Neira Ayuso | 63283dd | 2014-06-27 18:51:39 +0200 | [diff] [blame] | 613 | if (flags == ctx->table->flags) |
| 614 | return 0; |
| 615 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 616 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
| 617 | sizeof(struct nft_trans_table)); |
| 618 | if (trans == NULL) |
| 619 | return -ENOMEM; |
| 620 | |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 621 | if ((flags & NFT_TABLE_F_DORMANT) && |
| 622 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 623 | nft_trans_table_enable(trans) = false; |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 624 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
| 625 | ctx->table->flags & NFT_TABLE_F_DORMANT) { |
| 626 | ret = nf_tables_table_enable(ctx->afi, ctx->table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 627 | if (ret >= 0) { |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 628 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 629 | nft_trans_table_enable(trans) = true; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 630 | } |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 631 | } |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 632 | if (ret < 0) |
| 633 | goto err; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 634 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 635 | nft_trans_table_update(trans) = true; |
| 636 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 637 | return 0; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 638 | err: |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 639 | nft_trans_destroy(trans); |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 640 | return ret; |
| 641 | } |
| 642 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 643 | static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb, |
| 644 | const struct nlmsghdr *nlh, |
| 645 | const struct nlattr * const nla[]) |
| 646 | { |
| 647 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 648 | const struct nlattr *name; |
| 649 | struct nft_af_info *afi; |
| 650 | struct nft_table *table; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 651 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 652 | int family = nfmsg->nfgen_family; |
Patrick McHardy | c5c1f97 | 2014-01-09 18:42:39 +0000 | [diff] [blame] | 653 | u32 flags = 0; |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 654 | struct nft_ctx ctx; |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 655 | int err; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 656 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 657 | afi = nf_tables_afinfo_lookup(net, family, true); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 658 | if (IS_ERR(afi)) |
| 659 | return PTR_ERR(afi); |
| 660 | |
| 661 | name = nla[NFTA_TABLE_NAME]; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 662 | table = nf_tables_table_lookup(afi, name); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 663 | if (IS_ERR(table)) { |
| 664 | if (PTR_ERR(table) != -ENOENT) |
| 665 | return PTR_ERR(table); |
| 666 | table = NULL; |
| 667 | } |
| 668 | |
| 669 | if (table != NULL) { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 670 | if (table->flags & NFT_TABLE_INACTIVE) |
| 671 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 672 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 673 | return -EEXIST; |
| 674 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 675 | return -EOPNOTSUPP; |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 676 | |
| 677 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
| 678 | return nf_tables_updtable(&ctx); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 679 | } |
| 680 | |
Patrick McHardy | c5c1f97 | 2014-01-09 18:42:39 +0000 | [diff] [blame] | 681 | if (nla[NFTA_TABLE_FLAGS]) { |
| 682 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); |
| 683 | if (flags & ~NFT_TABLE_F_DORMANT) |
| 684 | return -EINVAL; |
| 685 | } |
| 686 | |
Patrick McHardy | 7047f9d | 2014-01-09 18:42:40 +0000 | [diff] [blame] | 687 | if (!try_module_get(afi->owner)) |
| 688 | return -EAFNOSUPPORT; |
| 689 | |
Pablo Neira Ayuso | 1cae565 | 2015-03-05 15:05:36 +0100 | [diff] [blame^] | 690 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
Patrick McHardy | 7047f9d | 2014-01-09 18:42:40 +0000 | [diff] [blame] | 691 | if (table == NULL) { |
| 692 | module_put(afi->owner); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 693 | return -ENOMEM; |
Patrick McHardy | 7047f9d | 2014-01-09 18:42:40 +0000 | [diff] [blame] | 694 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 695 | |
Pablo Neira Ayuso | 1cae565 | 2015-03-05 15:05:36 +0100 | [diff] [blame^] | 696 | nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 697 | INIT_LIST_HEAD(&table->chains); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 698 | INIT_LIST_HEAD(&table->sets); |
Patrick McHardy | c5c1f97 | 2014-01-09 18:42:39 +0000 | [diff] [blame] | 699 | table->flags = flags; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 700 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 701 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
| 702 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
| 703 | if (err < 0) { |
| 704 | kfree(table); |
| 705 | module_put(afi->owner); |
| 706 | return err; |
| 707 | } |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 708 | list_add_tail_rcu(&table->list, &afi->tables); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 709 | return 0; |
| 710 | } |
| 711 | |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 712 | static int nft_flush_table(struct nft_ctx *ctx) |
| 713 | { |
| 714 | int err; |
| 715 | struct nft_chain *chain, *nc; |
| 716 | struct nft_set *set, *ns; |
| 717 | |
Pablo Neira Ayuso | a2f18db | 2015-01-04 15:14:22 +0100 | [diff] [blame] | 718 | list_for_each_entry(chain, &ctx->table->chains, list) { |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 719 | ctx->chain = chain; |
| 720 | |
| 721 | err = nft_delrule_by_chain(ctx); |
| 722 | if (err < 0) |
| 723 | goto out; |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 724 | } |
| 725 | |
| 726 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { |
| 727 | if (set->flags & NFT_SET_ANONYMOUS && |
| 728 | !list_empty(&set->bindings)) |
| 729 | continue; |
| 730 | |
| 731 | err = nft_delset(ctx, set); |
| 732 | if (err < 0) |
| 733 | goto out; |
| 734 | } |
| 735 | |
Pablo Neira Ayuso | a2f18db | 2015-01-04 15:14:22 +0100 | [diff] [blame] | 736 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
| 737 | ctx->chain = chain; |
| 738 | |
| 739 | err = nft_delchain(ctx); |
| 740 | if (err < 0) |
| 741 | goto out; |
| 742 | } |
| 743 | |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 744 | err = nft_deltable(ctx); |
| 745 | out: |
| 746 | return err; |
| 747 | } |
| 748 | |
| 749 | static int nft_flush(struct nft_ctx *ctx, int family) |
| 750 | { |
| 751 | struct nft_af_info *afi; |
| 752 | struct nft_table *table, *nt; |
| 753 | const struct nlattr * const *nla = ctx->nla; |
| 754 | int err = 0; |
| 755 | |
| 756 | list_for_each_entry(afi, &ctx->net->nft.af_info, list) { |
| 757 | if (family != AF_UNSPEC && afi->family != family) |
| 758 | continue; |
| 759 | |
| 760 | ctx->afi = afi; |
| 761 | list_for_each_entry_safe(table, nt, &afi->tables, list) { |
| 762 | if (nla[NFTA_TABLE_NAME] && |
| 763 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) |
| 764 | continue; |
| 765 | |
| 766 | ctx->table = table; |
| 767 | |
| 768 | err = nft_flush_table(ctx); |
| 769 | if (err < 0) |
| 770 | goto out; |
| 771 | } |
| 772 | } |
| 773 | out: |
| 774 | return err; |
| 775 | } |
| 776 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 777 | static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb, |
| 778 | const struct nlmsghdr *nlh, |
| 779 | const struct nlattr * const nla[]) |
| 780 | { |
| 781 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 782 | struct nft_af_info *afi; |
| 783 | struct nft_table *table; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 784 | struct net *net = sock_net(skb->sk); |
Arturo Borrero | ee01d54 | 2014-09-02 16:42:25 +0200 | [diff] [blame] | 785 | int family = nfmsg->nfgen_family; |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 786 | struct nft_ctx ctx; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 787 | |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 788 | nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla); |
| 789 | if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL) |
| 790 | return nft_flush(&ctx, family); |
| 791 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 792 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 793 | if (IS_ERR(afi)) |
| 794 | return PTR_ERR(afi); |
| 795 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 796 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 797 | if (IS_ERR(table)) |
| 798 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 799 | if (table->flags & NFT_TABLE_INACTIVE) |
| 800 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 801 | |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 802 | ctx.afi = afi; |
| 803 | ctx.table = table; |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 804 | |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 805 | return nft_flush_table(&ctx); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 806 | } |
| 807 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 808 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
| 809 | { |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 810 | BUG_ON(ctx->table->use > 0); |
| 811 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 812 | kfree(ctx->table); |
| 813 | module_put(ctx->afi->owner); |
| 814 | } |
| 815 | |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 816 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 817 | { |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 818 | int err = 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 819 | |
| 820 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 821 | if (chain_type[ctype->family][ctype->type] != NULL) { |
| 822 | err = -EBUSY; |
| 823 | goto out; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 824 | } |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 825 | chain_type[ctype->family][ctype->type] = ctype; |
| 826 | out: |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 827 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 828 | return err; |
| 829 | } |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 830 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 831 | |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 832 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 833 | { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 834 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 835 | chain_type[ctype->family][ctype->type] = NULL; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 836 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 837 | } |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 838 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 839 | |
| 840 | /* |
| 841 | * Chains |
| 842 | */ |
| 843 | |
| 844 | static struct nft_chain * |
| 845 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) |
| 846 | { |
| 847 | struct nft_chain *chain; |
| 848 | |
| 849 | list_for_each_entry(chain, &table->chains, list) { |
| 850 | if (chain->handle == handle) |
| 851 | return chain; |
| 852 | } |
| 853 | |
| 854 | return ERR_PTR(-ENOENT); |
| 855 | } |
| 856 | |
| 857 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, |
| 858 | const struct nlattr *nla) |
| 859 | { |
| 860 | struct nft_chain *chain; |
| 861 | |
| 862 | if (nla == NULL) |
| 863 | return ERR_PTR(-EINVAL); |
| 864 | |
| 865 | list_for_each_entry(chain, &table->chains, list) { |
| 866 | if (!nla_strcmp(nla, chain->name)) |
| 867 | return chain; |
| 868 | } |
| 869 | |
| 870 | return ERR_PTR(-ENOENT); |
| 871 | } |
| 872 | |
| 873 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { |
| 874 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, |
| 875 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
| 876 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, |
| 877 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, |
| 878 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 879 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
Pablo Neira | 4c1f781 | 2014-03-31 17:43:47 +0200 | [diff] [blame] | 880 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 881 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 882 | }; |
| 883 | |
| 884 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { |
| 885 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, |
| 886 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, |
| 887 | }; |
| 888 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 889 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
| 890 | { |
| 891 | struct nft_stats *cpu_stats, total; |
| 892 | struct nlattr *nest; |
Eric Dumazet | ce355e2 | 2014-07-09 15:14:06 +0200 | [diff] [blame] | 893 | unsigned int seq; |
| 894 | u64 pkts, bytes; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 895 | int cpu; |
| 896 | |
| 897 | memset(&total, 0, sizeof(total)); |
| 898 | for_each_possible_cpu(cpu) { |
| 899 | cpu_stats = per_cpu_ptr(stats, cpu); |
Eric Dumazet | ce355e2 | 2014-07-09 15:14:06 +0200 | [diff] [blame] | 900 | do { |
| 901 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); |
| 902 | pkts = cpu_stats->pkts; |
| 903 | bytes = cpu_stats->bytes; |
| 904 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); |
| 905 | total.pkts += pkts; |
| 906 | total.bytes += bytes; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 907 | } |
| 908 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); |
| 909 | if (nest == NULL) |
| 910 | goto nla_put_failure; |
| 911 | |
| 912 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) || |
| 913 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes))) |
| 914 | goto nla_put_failure; |
| 915 | |
| 916 | nla_nest_end(skb, nest); |
| 917 | return 0; |
| 918 | |
| 919 | nla_put_failure: |
| 920 | return -ENOSPC; |
| 921 | } |
| 922 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 923 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
| 924 | u32 portid, u32 seq, int event, u32 flags, |
| 925 | int family, const struct nft_table *table, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 926 | const struct nft_chain *chain) |
| 927 | { |
| 928 | struct nlmsghdr *nlh; |
| 929 | struct nfgenmsg *nfmsg; |
| 930 | |
| 931 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 932 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
| 933 | if (nlh == NULL) |
| 934 | goto nla_put_failure; |
| 935 | |
| 936 | nfmsg = nlmsg_data(nlh); |
| 937 | nfmsg->nfgen_family = family; |
| 938 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 939 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 940 | |
| 941 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) |
| 942 | goto nla_put_failure; |
| 943 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle))) |
| 944 | goto nla_put_failure; |
| 945 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) |
| 946 | goto nla_put_failure; |
| 947 | |
| 948 | if (chain->flags & NFT_BASE_CHAIN) { |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 949 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 950 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 951 | struct nlattr *nest; |
| 952 | |
| 953 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 954 | if (nest == NULL) |
| 955 | goto nla_put_failure; |
| 956 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) |
| 957 | goto nla_put_failure; |
| 958 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) |
| 959 | goto nla_put_failure; |
| 960 | nla_nest_end(skb, nest); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 961 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 962 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
| 963 | htonl(basechain->policy))) |
| 964 | goto nla_put_failure; |
| 965 | |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 966 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
| 967 | goto nla_put_failure; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 968 | |
| 969 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) |
| 970 | goto nla_put_failure; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 971 | } |
| 972 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 973 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
| 974 | goto nla_put_failure; |
| 975 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 976 | nlmsg_end(skb, nlh); |
| 977 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 978 | |
| 979 | nla_put_failure: |
| 980 | nlmsg_trim(skb, nlh); |
| 981 | return -1; |
| 982 | } |
| 983 | |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 984 | static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 985 | { |
| 986 | struct sk_buff *skb; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 987 | int err; |
| 988 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 989 | if (!ctx->report && |
| 990 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 991 | return 0; |
| 992 | |
| 993 | err = -ENOBUFS; |
| 994 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 995 | if (skb == NULL) |
| 996 | goto err; |
| 997 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 998 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
| 999 | event, 0, ctx->afi->family, ctx->table, |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 1000 | ctx->chain); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1001 | if (err < 0) { |
| 1002 | kfree_skb(skb); |
| 1003 | goto err; |
| 1004 | } |
| 1005 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 1006 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1007 | ctx->report, GFP_KERNEL); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1008 | err: |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 1009 | if (err < 0) { |
| 1010 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1011 | err); |
| 1012 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1013 | return err; |
| 1014 | } |
| 1015 | |
| 1016 | static int nf_tables_dump_chains(struct sk_buff *skb, |
| 1017 | struct netlink_callback *cb) |
| 1018 | { |
| 1019 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
| 1020 | const struct nft_af_info *afi; |
| 1021 | const struct nft_table *table; |
| 1022 | const struct nft_chain *chain; |
| 1023 | unsigned int idx = 0, s_idx = cb->args[0]; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1024 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1025 | int family = nfmsg->nfgen_family; |
| 1026 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1027 | rcu_read_lock(); |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 1028 | cb->seq = net->nft.base_seq; |
| 1029 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1030 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1031 | if (family != NFPROTO_UNSPEC && family != afi->family) |
| 1032 | continue; |
| 1033 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1034 | list_for_each_entry_rcu(table, &afi->tables, list) { |
| 1035 | list_for_each_entry_rcu(chain, &table->chains, list) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1036 | if (idx < s_idx) |
| 1037 | goto cont; |
| 1038 | if (idx > s_idx) |
| 1039 | memset(&cb->args[1], 0, |
| 1040 | sizeof(cb->args) - sizeof(cb->args[0])); |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1041 | if (nf_tables_fill_chain_info(skb, net, |
| 1042 | NETLINK_CB(cb->skb).portid, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1043 | cb->nlh->nlmsg_seq, |
| 1044 | NFT_MSG_NEWCHAIN, |
| 1045 | NLM_F_MULTI, |
| 1046 | afi->family, table, chain) < 0) |
| 1047 | goto done; |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 1048 | |
| 1049 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1050 | cont: |
| 1051 | idx++; |
| 1052 | } |
| 1053 | } |
| 1054 | } |
| 1055 | done: |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1056 | rcu_read_unlock(); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1057 | cb->args[0] = idx; |
| 1058 | return skb->len; |
| 1059 | } |
| 1060 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1061 | static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb, |
| 1062 | const struct nlmsghdr *nlh, |
| 1063 | const struct nlattr * const nla[]) |
| 1064 | { |
| 1065 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 1066 | const struct nft_af_info *afi; |
| 1067 | const struct nft_table *table; |
| 1068 | const struct nft_chain *chain; |
| 1069 | struct sk_buff *skb2; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1070 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1071 | int family = nfmsg->nfgen_family; |
| 1072 | int err; |
| 1073 | |
| 1074 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 1075 | struct netlink_dump_control c = { |
| 1076 | .dump = nf_tables_dump_chains, |
| 1077 | }; |
| 1078 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 1079 | } |
| 1080 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1081 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1082 | if (IS_ERR(afi)) |
| 1083 | return PTR_ERR(afi); |
| 1084 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1085 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1086 | if (IS_ERR(table)) |
| 1087 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 1088 | if (table->flags & NFT_TABLE_INACTIVE) |
| 1089 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1090 | |
| 1091 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); |
| 1092 | if (IS_ERR(chain)) |
| 1093 | return PTR_ERR(chain); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1094 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1095 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1096 | |
| 1097 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1098 | if (!skb2) |
| 1099 | return -ENOMEM; |
| 1100 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1101 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1102 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
| 1103 | family, table, chain); |
| 1104 | if (err < 0) |
| 1105 | goto err; |
| 1106 | |
| 1107 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 1108 | |
| 1109 | err: |
| 1110 | kfree_skb(skb2); |
| 1111 | return err; |
| 1112 | } |
| 1113 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1114 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
| 1115 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, |
| 1116 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, |
| 1117 | }; |
| 1118 | |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1119 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1120 | { |
| 1121 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; |
| 1122 | struct nft_stats __percpu *newstats; |
| 1123 | struct nft_stats *stats; |
| 1124 | int err; |
| 1125 | |
| 1126 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); |
| 1127 | if (err < 0) |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1128 | return ERR_PTR(err); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1129 | |
| 1130 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1131 | return ERR_PTR(-EINVAL); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1132 | |
Eric Dumazet | ce355e2 | 2014-07-09 15:14:06 +0200 | [diff] [blame] | 1133 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1134 | if (newstats == NULL) |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1135 | return ERR_PTR(-ENOMEM); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1136 | |
| 1137 | /* Restore old counters on this cpu, no problem. Per-cpu statistics |
| 1138 | * are not exposed to userspace. |
| 1139 | */ |
Pablo Neira Ayuso | e8781f7 | 2015-01-21 18:04:18 +0100 | [diff] [blame] | 1140 | preempt_disable(); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1141 | stats = this_cpu_ptr(newstats); |
| 1142 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); |
| 1143 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); |
Pablo Neira Ayuso | e8781f7 | 2015-01-21 18:04:18 +0100 | [diff] [blame] | 1144 | preempt_enable(); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1145 | |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1146 | return newstats; |
| 1147 | } |
| 1148 | |
| 1149 | static void nft_chain_stats_replace(struct nft_base_chain *chain, |
| 1150 | struct nft_stats __percpu *newstats) |
| 1151 | { |
Pablo Neira Ayuso | b88825d | 2014-08-05 17:25:59 +0200 | [diff] [blame] | 1152 | if (newstats == NULL) |
| 1153 | return; |
| 1154 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1155 | if (chain->stats) { |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1156 | struct nft_stats __percpu *oldstats = |
Patrick McHardy | 67a8fc2 | 2014-02-18 18:06:49 +0000 | [diff] [blame] | 1157 | nft_dereference(chain->stats); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1158 | |
| 1159 | rcu_assign_pointer(chain->stats, newstats); |
| 1160 | synchronize_rcu(); |
| 1161 | free_percpu(oldstats); |
| 1162 | } else |
| 1163 | rcu_assign_pointer(chain->stats, newstats); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1164 | } |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1165 | |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1166 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
| 1167 | { |
| 1168 | BUG_ON(chain->use > 0); |
| 1169 | |
| 1170 | if (chain->flags & NFT_BASE_CHAIN) { |
| 1171 | module_put(nft_base_chain(chain)->type->owner); |
| 1172 | free_percpu(nft_base_chain(chain)->stats); |
| 1173 | kfree(nft_base_chain(chain)); |
| 1174 | } else { |
| 1175 | kfree(chain); |
| 1176 | } |
| 1177 | } |
| 1178 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1179 | static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb, |
| 1180 | const struct nlmsghdr *nlh, |
| 1181 | const struct nlattr * const nla[]) |
| 1182 | { |
| 1183 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 1184 | const struct nlattr * uninitialized_var(name); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 1185 | struct nft_af_info *afi; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1186 | struct nft_table *table; |
| 1187 | struct nft_chain *chain; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1188 | struct nft_base_chain *basechain = NULL; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1189 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1190 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1191 | int family = nfmsg->nfgen_family; |
Patrick McHardy | 57de2a0 | 2014-01-09 18:42:31 +0000 | [diff] [blame] | 1192 | u8 policy = NF_ACCEPT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1193 | u64 handle = 0; |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 1194 | unsigned int i; |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1195 | struct nft_stats __percpu *stats; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1196 | int err; |
| 1197 | bool create; |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1198 | struct nft_ctx ctx; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1199 | |
| 1200 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| 1201 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1202 | afi = nf_tables_afinfo_lookup(net, family, true); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1203 | if (IS_ERR(afi)) |
| 1204 | return PTR_ERR(afi); |
| 1205 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1206 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1207 | if (IS_ERR(table)) |
| 1208 | return PTR_ERR(table); |
| 1209 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1210 | chain = NULL; |
| 1211 | name = nla[NFTA_CHAIN_NAME]; |
| 1212 | |
| 1213 | if (nla[NFTA_CHAIN_HANDLE]) { |
| 1214 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); |
| 1215 | chain = nf_tables_chain_lookup_byhandle(table, handle); |
| 1216 | if (IS_ERR(chain)) |
| 1217 | return PTR_ERR(chain); |
| 1218 | } else { |
| 1219 | chain = nf_tables_chain_lookup(table, name); |
| 1220 | if (IS_ERR(chain)) { |
| 1221 | if (PTR_ERR(chain) != -ENOENT) |
| 1222 | return PTR_ERR(chain); |
| 1223 | chain = NULL; |
| 1224 | } |
| 1225 | } |
| 1226 | |
Patrick McHardy | 57de2a0 | 2014-01-09 18:42:31 +0000 | [diff] [blame] | 1227 | if (nla[NFTA_CHAIN_POLICY]) { |
| 1228 | if ((chain != NULL && |
| 1229 | !(chain->flags & NFT_BASE_CHAIN)) || |
| 1230 | nla[NFTA_CHAIN_HOOK] == NULL) |
| 1231 | return -EOPNOTSUPP; |
| 1232 | |
Pablo Neira Ayuso | 8f46df1 | 2014-01-10 15:11:25 +0100 | [diff] [blame] | 1233 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
Patrick McHardy | 57de2a0 | 2014-01-09 18:42:31 +0000 | [diff] [blame] | 1234 | switch (policy) { |
| 1235 | case NF_DROP: |
| 1236 | case NF_ACCEPT: |
| 1237 | break; |
| 1238 | default: |
| 1239 | return -EINVAL; |
| 1240 | } |
| 1241 | } |
| 1242 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1243 | if (chain != NULL) { |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1244 | struct nft_stats *stats = NULL; |
| 1245 | struct nft_trans *trans; |
| 1246 | |
| 1247 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1248 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1249 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 1250 | return -EEXIST; |
| 1251 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 1252 | return -EOPNOTSUPP; |
| 1253 | |
| 1254 | if (nla[NFTA_CHAIN_HANDLE] && name && |
| 1255 | !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) |
| 1256 | return -EEXIST; |
| 1257 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1258 | if (nla[NFTA_CHAIN_COUNTERS]) { |
| 1259 | if (!(chain->flags & NFT_BASE_CHAIN)) |
| 1260 | return -EOPNOTSUPP; |
| 1261 | |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1262 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
| 1263 | if (IS_ERR(stats)) |
| 1264 | return PTR_ERR(stats); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1265 | } |
| 1266 | |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1267 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
| 1268 | trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN, |
| 1269 | sizeof(struct nft_trans_chain)); |
Pablo Neira Ayuso | f5553c1 | 2015-01-29 19:08:09 +0100 | [diff] [blame] | 1270 | if (trans == NULL) { |
| 1271 | free_percpu(stats); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1272 | return -ENOMEM; |
Pablo Neira Ayuso | f5553c1 | 2015-01-29 19:08:09 +0100 | [diff] [blame] | 1273 | } |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1274 | |
| 1275 | nft_trans_chain_stats(trans) = stats; |
| 1276 | nft_trans_chain_update(trans) = true; |
| 1277 | |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1278 | if (nla[NFTA_CHAIN_POLICY]) |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1279 | nft_trans_chain_policy(trans) = policy; |
| 1280 | else |
| 1281 | nft_trans_chain_policy(trans) = -1; |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1282 | |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1283 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
| 1284 | nla_strlcpy(nft_trans_chain_name(trans), name, |
| 1285 | NFT_CHAIN_MAXNAMELEN); |
| 1286 | } |
| 1287 | list_add_tail(&trans->list, &net->nft.commit_list); |
| 1288 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1289 | } |
| 1290 | |
Patrick McHardy | 7582067 | 2014-01-09 18:42:33 +0000 | [diff] [blame] | 1291 | if (table->use == UINT_MAX) |
| 1292 | return -EOVERFLOW; |
| 1293 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1294 | if (nla[NFTA_CHAIN_HOOK]) { |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 1295 | const struct nf_chain_type *type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1296 | struct nf_hook_ops *ops; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1297 | nf_hookfn *hookfn; |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 1298 | u32 hooknum, priority; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1299 | |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 1300 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1301 | if (nla[NFTA_CHAIN_TYPE]) { |
| 1302 | type = nf_tables_chain_type_lookup(afi, |
| 1303 | nla[NFTA_CHAIN_TYPE], |
| 1304 | create); |
Patrick McHardy | 93b0806 | 2014-01-09 18:42:36 +0000 | [diff] [blame] | 1305 | if (IS_ERR(type)) |
| 1306 | return PTR_ERR(type); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1307 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1308 | |
| 1309 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], |
| 1310 | nft_hook_policy); |
| 1311 | if (err < 0) |
| 1312 | return err; |
| 1313 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || |
| 1314 | ha[NFTA_HOOK_PRIORITY] == NULL) |
| 1315 | return -EINVAL; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1316 | |
| 1317 | hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); |
| 1318 | if (hooknum >= afi->nhooks) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1319 | return -EINVAL; |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 1320 | priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1321 | |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 1322 | if (!(type->hook_mask & (1 << hooknum))) |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1323 | return -EOPNOTSUPP; |
Patrick McHardy | fa2c1de | 2014-01-09 18:42:38 +0000 | [diff] [blame] | 1324 | if (!try_module_get(type->owner)) |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 1325 | return -ENOENT; |
Patrick McHardy | fa2c1de | 2014-01-09 18:42:38 +0000 | [diff] [blame] | 1326 | hookfn = type->hooks[hooknum]; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1327 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1328 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
Pablo Neira Ayuso | f5553c1 | 2015-01-29 19:08:09 +0100 | [diff] [blame] | 1329 | if (basechain == NULL) { |
| 1330 | module_put(type->owner); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1331 | return -ENOMEM; |
Pablo Neira Ayuso | f5553c1 | 2015-01-29 19:08:09 +0100 | [diff] [blame] | 1332 | } |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1333 | |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1334 | if (nla[NFTA_CHAIN_COUNTERS]) { |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1335 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
| 1336 | if (IS_ERR(stats)) { |
Patrick McHardy | fa2c1de | 2014-01-09 18:42:38 +0000 | [diff] [blame] | 1337 | module_put(type->owner); |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1338 | kfree(basechain); |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1339 | return PTR_ERR(stats); |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1340 | } |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1341 | basechain->stats = stats; |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1342 | } else { |
Eric Dumazet | ce355e2 | 2014-07-09 15:14:06 +0200 | [diff] [blame] | 1343 | stats = netdev_alloc_pcpu_stats(struct nft_stats); |
Sabrina Dubroca | c123bb7 | 2014-10-21 11:08:21 +0200 | [diff] [blame] | 1344 | if (stats == NULL) { |
Patrick McHardy | fa2c1de | 2014-01-09 18:42:38 +0000 | [diff] [blame] | 1345 | module_put(type->owner); |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1346 | kfree(basechain); |
Sabrina Dubroca | c123bb7 | 2014-10-21 11:08:21 +0200 | [diff] [blame] | 1347 | return -ENOMEM; |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1348 | } |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1349 | rcu_assign_pointer(basechain->stats, stats); |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1350 | } |
| 1351 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1352 | basechain->type = type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1353 | chain = &basechain->chain; |
| 1354 | |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 1355 | for (i = 0; i < afi->nops; i++) { |
| 1356 | ops = &basechain->ops[i]; |
| 1357 | ops->pf = family; |
| 1358 | ops->owner = afi->owner; |
| 1359 | ops->hooknum = hooknum; |
| 1360 | ops->priority = priority; |
| 1361 | ops->priv = chain; |
| 1362 | ops->hook = afi->hooks[ops->hooknum]; |
| 1363 | if (hookfn) |
| 1364 | ops->hook = hookfn; |
| 1365 | if (afi->hook_ops_init) |
| 1366 | afi->hook_ops_init(ops, i); |
| 1367 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1368 | |
| 1369 | chain->flags |= NFT_BASE_CHAIN; |
Patrick McHardy | 57de2a0 | 2014-01-09 18:42:31 +0000 | [diff] [blame] | 1370 | basechain->policy = policy; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1371 | } else { |
| 1372 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); |
| 1373 | if (chain == NULL) |
| 1374 | return -ENOMEM; |
| 1375 | } |
| 1376 | |
| 1377 | INIT_LIST_HEAD(&chain->rules); |
| 1378 | chain->handle = nf_tables_alloc_handle(table); |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 1379 | chain->net = net; |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 1380 | chain->table = table; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1381 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
| 1382 | |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 1383 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
| 1384 | chain->flags & NFT_BASE_CHAIN) { |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 1385 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1386 | if (err < 0) |
| 1387 | goto err1; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1388 | } |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1389 | |
| 1390 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
| 1391 | err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN); |
| 1392 | if (err < 0) |
| 1393 | goto err2; |
| 1394 | |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 1395 | table->use++; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1396 | list_add_tail_rcu(&chain->list, &table->chains); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1397 | return 0; |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1398 | err2: |
Arturo Borrero | c559879 | 2014-09-02 16:42:23 +0200 | [diff] [blame] | 1399 | nf_tables_unregister_hooks(table, chain, afi->nops); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1400 | err1: |
| 1401 | nf_tables_chain_destroy(chain); |
| 1402 | return err; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1403 | } |
| 1404 | |
| 1405 | static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb, |
| 1406 | const struct nlmsghdr *nlh, |
| 1407 | const struct nlattr * const nla[]) |
| 1408 | { |
| 1409 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 1410 | struct nft_af_info *afi; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1411 | struct nft_table *table; |
| 1412 | struct nft_chain *chain; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1413 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1414 | int family = nfmsg->nfgen_family; |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1415 | struct nft_ctx ctx; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1416 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1417 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1418 | if (IS_ERR(afi)) |
| 1419 | return PTR_ERR(afi); |
| 1420 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1421 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1422 | if (IS_ERR(table)) |
| 1423 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 1424 | if (table->flags & NFT_TABLE_INACTIVE) |
| 1425 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1426 | |
| 1427 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); |
| 1428 | if (IS_ERR(chain)) |
| 1429 | return PTR_ERR(chain); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1430 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1431 | return -ENOENT; |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 1432 | if (chain->use > 0) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1433 | return -EBUSY; |
| 1434 | |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1435 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1436 | |
Arturo Borrero | ee01d54 | 2014-09-02 16:42:25 +0200 | [diff] [blame] | 1437 | return nft_delchain(&ctx); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1438 | } |
| 1439 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1440 | /* |
| 1441 | * Expressions |
| 1442 | */ |
| 1443 | |
| 1444 | /** |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1445 | * nft_register_expr - register nf_tables expr type |
| 1446 | * @ops: expr type |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1447 | * |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1448 | * Registers the expr type for use with nf_tables. Returns zero on |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1449 | * success or a negative errno code otherwise. |
| 1450 | */ |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1451 | int nft_register_expr(struct nft_expr_type *type) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1452 | { |
| 1453 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Tomasz Bursztyka | 758dbce | 2014-04-14 15:41:26 +0300 | [diff] [blame] | 1454 | if (type->family == NFPROTO_UNSPEC) |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1455 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
Tomasz Bursztyka | 758dbce | 2014-04-14 15:41:26 +0300 | [diff] [blame] | 1456 | else |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1457 | list_add_rcu(&type->list, &nf_tables_expressions); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1458 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 1459 | return 0; |
| 1460 | } |
| 1461 | EXPORT_SYMBOL_GPL(nft_register_expr); |
| 1462 | |
| 1463 | /** |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1464 | * nft_unregister_expr - unregister nf_tables expr type |
| 1465 | * @ops: expr type |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1466 | * |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1467 | * Unregisters the expr typefor use with nf_tables. |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1468 | */ |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1469 | void nft_unregister_expr(struct nft_expr_type *type) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1470 | { |
| 1471 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1472 | list_del_rcu(&type->list); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1473 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 1474 | } |
| 1475 | EXPORT_SYMBOL_GPL(nft_unregister_expr); |
| 1476 | |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1477 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
| 1478 | struct nlattr *nla) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1479 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1480 | const struct nft_expr_type *type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1481 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1482 | list_for_each_entry(type, &nf_tables_expressions, list) { |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1483 | if (!nla_strcmp(nla, type->name) && |
| 1484 | (!type->family || type->family == family)) |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1485 | return type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1486 | } |
| 1487 | return NULL; |
| 1488 | } |
| 1489 | |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1490 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
| 1491 | struct nlattr *nla) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1492 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1493 | const struct nft_expr_type *type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1494 | |
| 1495 | if (nla == NULL) |
| 1496 | return ERR_PTR(-EINVAL); |
| 1497 | |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1498 | type = __nft_expr_type_get(family, nla); |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1499 | if (type != NULL && try_module_get(type->owner)) |
| 1500 | return type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1501 | |
| 1502 | #ifdef CONFIG_MODULES |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1503 | if (type == NULL) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1504 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1505 | request_module("nft-expr-%u-%.*s", family, |
| 1506 | nla_len(nla), (char *)nla_data(nla)); |
| 1507 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 1508 | if (__nft_expr_type_get(family, nla)) |
| 1509 | return ERR_PTR(-EAGAIN); |
| 1510 | |
| 1511 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1512 | request_module("nft-expr-%.*s", |
| 1513 | nla_len(nla), (char *)nla_data(nla)); |
| 1514 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1515 | if (__nft_expr_type_get(family, nla)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1516 | return ERR_PTR(-EAGAIN); |
| 1517 | } |
| 1518 | #endif |
| 1519 | return ERR_PTR(-ENOENT); |
| 1520 | } |
| 1521 | |
| 1522 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { |
| 1523 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, |
| 1524 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, |
| 1525 | }; |
| 1526 | |
| 1527 | static int nf_tables_fill_expr_info(struct sk_buff *skb, |
| 1528 | const struct nft_expr *expr) |
| 1529 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1530 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1531 | goto nla_put_failure; |
| 1532 | |
| 1533 | if (expr->ops->dump) { |
| 1534 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); |
| 1535 | if (data == NULL) |
| 1536 | goto nla_put_failure; |
| 1537 | if (expr->ops->dump(skb, expr) < 0) |
| 1538 | goto nla_put_failure; |
| 1539 | nla_nest_end(skb, data); |
| 1540 | } |
| 1541 | |
| 1542 | return skb->len; |
| 1543 | |
| 1544 | nla_put_failure: |
| 1545 | return -1; |
| 1546 | }; |
| 1547 | |
| 1548 | struct nft_expr_info { |
| 1549 | const struct nft_expr_ops *ops; |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1550 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1551 | }; |
| 1552 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1553 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
| 1554 | const struct nlattr *nla, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1555 | struct nft_expr_info *info) |
| 1556 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1557 | const struct nft_expr_type *type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1558 | const struct nft_expr_ops *ops; |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1559 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1560 | int err; |
| 1561 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1562 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1563 | if (err < 0) |
| 1564 | return err; |
| 1565 | |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1566 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1567 | if (IS_ERR(type)) |
| 1568 | return PTR_ERR(type); |
| 1569 | |
| 1570 | if (tb[NFTA_EXPR_DATA]) { |
| 1571 | err = nla_parse_nested(info->tb, type->maxattr, |
| 1572 | tb[NFTA_EXPR_DATA], type->policy); |
| 1573 | if (err < 0) |
| 1574 | goto err1; |
| 1575 | } else |
| 1576 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); |
| 1577 | |
| 1578 | if (type->select_ops != NULL) { |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1579 | ops = type->select_ops(ctx, |
| 1580 | (const struct nlattr * const *)info->tb); |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1581 | if (IS_ERR(ops)) { |
| 1582 | err = PTR_ERR(ops); |
| 1583 | goto err1; |
| 1584 | } |
| 1585 | } else |
| 1586 | ops = type->ops; |
| 1587 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1588 | info->ops = ops; |
| 1589 | return 0; |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1590 | |
| 1591 | err1: |
| 1592 | module_put(type->owner); |
| 1593 | return err; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1594 | } |
| 1595 | |
| 1596 | static int nf_tables_newexpr(const struct nft_ctx *ctx, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1597 | const struct nft_expr_info *info, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1598 | struct nft_expr *expr) |
| 1599 | { |
| 1600 | const struct nft_expr_ops *ops = info->ops; |
| 1601 | int err; |
| 1602 | |
| 1603 | expr->ops = ops; |
| 1604 | if (ops->init) { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1605 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1606 | if (err < 0) |
| 1607 | goto err1; |
| 1608 | } |
| 1609 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1610 | return 0; |
| 1611 | |
| 1612 | err1: |
| 1613 | expr->ops = NULL; |
| 1614 | return err; |
| 1615 | } |
| 1616 | |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 1617 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
| 1618 | struct nft_expr *expr) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1619 | { |
| 1620 | if (expr->ops->destroy) |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 1621 | expr->ops->destroy(ctx, expr); |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1622 | module_put(expr->ops->type->owner); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1623 | } |
| 1624 | |
| 1625 | /* |
| 1626 | * Rules |
| 1627 | */ |
| 1628 | |
| 1629 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, |
| 1630 | u64 handle) |
| 1631 | { |
| 1632 | struct nft_rule *rule; |
| 1633 | |
| 1634 | // FIXME: this sucks |
| 1635 | list_for_each_entry(rule, &chain->rules, list) { |
| 1636 | if (handle == rule->handle) |
| 1637 | return rule; |
| 1638 | } |
| 1639 | |
| 1640 | return ERR_PTR(-ENOENT); |
| 1641 | } |
| 1642 | |
| 1643 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, |
| 1644 | const struct nlattr *nla) |
| 1645 | { |
| 1646 | if (nla == NULL) |
| 1647 | return ERR_PTR(-EINVAL); |
| 1648 | |
| 1649 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); |
| 1650 | } |
| 1651 | |
| 1652 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { |
| 1653 | [NFTA_RULE_TABLE] = { .type = NLA_STRING }, |
| 1654 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
| 1655 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, |
| 1656 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, |
| 1657 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1658 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1659 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
Pablo Neira Ayuso | 0768b3b | 2014-02-19 17:27:06 +0100 | [diff] [blame] | 1660 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
| 1661 | .len = NFT_USERDATA_MAXLEN }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1662 | }; |
| 1663 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1664 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
| 1665 | u32 portid, u32 seq, int event, |
| 1666 | u32 flags, int family, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1667 | const struct nft_table *table, |
| 1668 | const struct nft_chain *chain, |
| 1669 | const struct nft_rule *rule) |
| 1670 | { |
| 1671 | struct nlmsghdr *nlh; |
| 1672 | struct nfgenmsg *nfmsg; |
| 1673 | const struct nft_expr *expr, *next; |
| 1674 | struct nlattr *list; |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1675 | const struct nft_rule *prule; |
| 1676 | int type = event | NFNL_SUBSYS_NFTABLES << 8; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1677 | |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1678 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1679 | flags); |
| 1680 | if (nlh == NULL) |
| 1681 | goto nla_put_failure; |
| 1682 | |
| 1683 | nfmsg = nlmsg_data(nlh); |
| 1684 | nfmsg->nfgen_family = family; |
| 1685 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1686 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1687 | |
| 1688 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) |
| 1689 | goto nla_put_failure; |
| 1690 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) |
| 1691 | goto nla_put_failure; |
| 1692 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle))) |
| 1693 | goto nla_put_failure; |
| 1694 | |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1695 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
| 1696 | prule = list_entry(rule->list.prev, struct nft_rule, list); |
| 1697 | if (nla_put_be64(skb, NFTA_RULE_POSITION, |
| 1698 | cpu_to_be64(prule->handle))) |
| 1699 | goto nla_put_failure; |
| 1700 | } |
| 1701 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1702 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
| 1703 | if (list == NULL) |
| 1704 | goto nla_put_failure; |
| 1705 | nft_rule_for_each_expr(expr, next, rule) { |
| 1706 | struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM); |
| 1707 | if (elem == NULL) |
| 1708 | goto nla_put_failure; |
| 1709 | if (nf_tables_fill_expr_info(skb, expr) < 0) |
| 1710 | goto nla_put_failure; |
| 1711 | nla_nest_end(skb, elem); |
| 1712 | } |
| 1713 | nla_nest_end(skb, list); |
| 1714 | |
Pablo Neira Ayuso | 0768b3b | 2014-02-19 17:27:06 +0100 | [diff] [blame] | 1715 | if (rule->ulen && |
| 1716 | nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule))) |
| 1717 | goto nla_put_failure; |
| 1718 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 1719 | nlmsg_end(skb, nlh); |
| 1720 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1721 | |
| 1722 | nla_put_failure: |
| 1723 | nlmsg_trim(skb, nlh); |
| 1724 | return -1; |
| 1725 | } |
| 1726 | |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 1727 | static int nf_tables_rule_notify(const struct nft_ctx *ctx, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1728 | const struct nft_rule *rule, |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 1729 | int event) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1730 | { |
| 1731 | struct sk_buff *skb; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1732 | int err; |
| 1733 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 1734 | if (!ctx->report && |
| 1735 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1736 | return 0; |
| 1737 | |
| 1738 | err = -ENOBUFS; |
| 1739 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1740 | if (skb == NULL) |
| 1741 | goto err; |
| 1742 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1743 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
| 1744 | event, 0, ctx->afi->family, ctx->table, |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 1745 | ctx->chain, rule); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1746 | if (err < 0) { |
| 1747 | kfree_skb(skb); |
| 1748 | goto err; |
| 1749 | } |
| 1750 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 1751 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1752 | ctx->report, GFP_KERNEL); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1753 | err: |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 1754 | if (err < 0) { |
| 1755 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1756 | err); |
| 1757 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1758 | return err; |
| 1759 | } |
| 1760 | |
| 1761 | static int nf_tables_dump_rules(struct sk_buff *skb, |
| 1762 | struct netlink_callback *cb) |
| 1763 | { |
| 1764 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
| 1765 | const struct nft_af_info *afi; |
| 1766 | const struct nft_table *table; |
| 1767 | const struct nft_chain *chain; |
| 1768 | const struct nft_rule *rule; |
| 1769 | unsigned int idx = 0, s_idx = cb->args[0]; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1770 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1771 | int family = nfmsg->nfgen_family; |
| 1772 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1773 | rcu_read_lock(); |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 1774 | cb->seq = net->nft.base_seq; |
| 1775 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1776 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1777 | if (family != NFPROTO_UNSPEC && family != afi->family) |
| 1778 | continue; |
| 1779 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1780 | list_for_each_entry_rcu(table, &afi->tables, list) { |
| 1781 | list_for_each_entry_rcu(chain, &table->chains, list) { |
| 1782 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 1783 | if (!nft_rule_is_active(net, rule)) |
| 1784 | goto cont; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1785 | if (idx < s_idx) |
| 1786 | goto cont; |
| 1787 | if (idx > s_idx) |
| 1788 | memset(&cb->args[1], 0, |
| 1789 | sizeof(cb->args) - sizeof(cb->args[0])); |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1790 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1791 | cb->nlh->nlmsg_seq, |
| 1792 | NFT_MSG_NEWRULE, |
| 1793 | NLM_F_MULTI | NLM_F_APPEND, |
| 1794 | afi->family, table, chain, rule) < 0) |
| 1795 | goto done; |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 1796 | |
| 1797 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1798 | cont: |
| 1799 | idx++; |
| 1800 | } |
| 1801 | } |
| 1802 | } |
| 1803 | } |
| 1804 | done: |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1805 | rcu_read_unlock(); |
| 1806 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1807 | cb->args[0] = idx; |
| 1808 | return skb->len; |
| 1809 | } |
| 1810 | |
| 1811 | static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb, |
| 1812 | const struct nlmsghdr *nlh, |
| 1813 | const struct nlattr * const nla[]) |
| 1814 | { |
| 1815 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 1816 | const struct nft_af_info *afi; |
| 1817 | const struct nft_table *table; |
| 1818 | const struct nft_chain *chain; |
| 1819 | const struct nft_rule *rule; |
| 1820 | struct sk_buff *skb2; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1821 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1822 | int family = nfmsg->nfgen_family; |
| 1823 | int err; |
| 1824 | |
| 1825 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 1826 | struct netlink_dump_control c = { |
| 1827 | .dump = nf_tables_dump_rules, |
| 1828 | }; |
| 1829 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 1830 | } |
| 1831 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1832 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1833 | if (IS_ERR(afi)) |
| 1834 | return PTR_ERR(afi); |
| 1835 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1836 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1837 | if (IS_ERR(table)) |
| 1838 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 1839 | if (table->flags & NFT_TABLE_INACTIVE) |
| 1840 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1841 | |
| 1842 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| 1843 | if (IS_ERR(chain)) |
| 1844 | return PTR_ERR(chain); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1845 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1846 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1847 | |
| 1848 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); |
| 1849 | if (IS_ERR(rule)) |
| 1850 | return PTR_ERR(rule); |
| 1851 | |
| 1852 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1853 | if (!skb2) |
| 1854 | return -ENOMEM; |
| 1855 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1856 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1857 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
| 1858 | family, table, chain, rule); |
| 1859 | if (err < 0) |
| 1860 | goto err; |
| 1861 | |
| 1862 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 1863 | |
| 1864 | err: |
| 1865 | kfree_skb(skb2); |
| 1866 | return err; |
| 1867 | } |
| 1868 | |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 1869 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
| 1870 | struct nft_rule *rule) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1871 | { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1872 | struct nft_expr *expr; |
| 1873 | |
| 1874 | /* |
| 1875 | * Careful: some expressions might not be initialized in case this |
| 1876 | * is called on error from nf_tables_newrule(). |
| 1877 | */ |
| 1878 | expr = nft_expr_first(rule); |
| 1879 | while (expr->ops && expr != nft_expr_last(rule)) { |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 1880 | nf_tables_expr_destroy(ctx, expr); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1881 | expr = nft_expr_next(expr); |
| 1882 | } |
| 1883 | kfree(rule); |
| 1884 | } |
| 1885 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1886 | #define NFT_RULE_MAXEXPRS 128 |
| 1887 | |
| 1888 | static struct nft_expr_info *info; |
| 1889 | |
| 1890 | static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, |
| 1891 | const struct nlmsghdr *nlh, |
| 1892 | const struct nlattr * const nla[]) |
| 1893 | { |
| 1894 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 1895 | struct nft_af_info *afi; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1896 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1897 | struct nft_table *table; |
| 1898 | struct nft_chain *chain; |
| 1899 | struct nft_rule *rule, *old_rule = NULL; |
Pablo Neira Ayuso | 1081d11 | 2014-04-04 01:24:07 +0200 | [diff] [blame] | 1900 | struct nft_trans *trans = NULL; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1901 | struct nft_expr *expr; |
| 1902 | struct nft_ctx ctx; |
| 1903 | struct nlattr *tmp; |
Pablo Neira Ayuso | 0768b3b | 2014-02-19 17:27:06 +0100 | [diff] [blame] | 1904 | unsigned int size, i, n, ulen = 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1905 | int err, rem; |
| 1906 | bool create; |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1907 | u64 handle, pos_handle; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1908 | |
| 1909 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| 1910 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1911 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1912 | if (IS_ERR(afi)) |
| 1913 | return PTR_ERR(afi); |
| 1914 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1915 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1916 | if (IS_ERR(table)) |
| 1917 | return PTR_ERR(table); |
| 1918 | |
| 1919 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| 1920 | if (IS_ERR(chain)) |
| 1921 | return PTR_ERR(chain); |
| 1922 | |
| 1923 | if (nla[NFTA_RULE_HANDLE]) { |
| 1924 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); |
| 1925 | rule = __nf_tables_rule_lookup(chain, handle); |
| 1926 | if (IS_ERR(rule)) |
| 1927 | return PTR_ERR(rule); |
| 1928 | |
| 1929 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 1930 | return -EEXIST; |
| 1931 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 1932 | old_rule = rule; |
| 1933 | else |
| 1934 | return -EOPNOTSUPP; |
| 1935 | } else { |
| 1936 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) |
| 1937 | return -EINVAL; |
| 1938 | handle = nf_tables_alloc_handle(table); |
Pablo Neira Ayuso | a0a7379 | 2014-06-10 10:53:01 +0200 | [diff] [blame] | 1939 | |
| 1940 | if (chain->use == UINT_MAX) |
| 1941 | return -EOVERFLOW; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1942 | } |
| 1943 | |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1944 | if (nla[NFTA_RULE_POSITION]) { |
| 1945 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) |
| 1946 | return -EOPNOTSUPP; |
| 1947 | |
| 1948 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); |
| 1949 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); |
| 1950 | if (IS_ERR(old_rule)) |
| 1951 | return PTR_ERR(old_rule); |
| 1952 | } |
| 1953 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1954 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
| 1955 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1956 | n = 0; |
| 1957 | size = 0; |
| 1958 | if (nla[NFTA_RULE_EXPRESSIONS]) { |
| 1959 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { |
| 1960 | err = -EINVAL; |
| 1961 | if (nla_type(tmp) != NFTA_LIST_ELEM) |
| 1962 | goto err1; |
| 1963 | if (n == NFT_RULE_MAXEXPRS) |
| 1964 | goto err1; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1965 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1966 | if (err < 0) |
| 1967 | goto err1; |
| 1968 | size += info[n].ops->size; |
| 1969 | n++; |
| 1970 | } |
| 1971 | } |
| 1972 | |
Pablo Neira Ayuso | 0768b3b | 2014-02-19 17:27:06 +0100 | [diff] [blame] | 1973 | if (nla[NFTA_RULE_USERDATA]) |
| 1974 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
| 1975 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1976 | err = -ENOMEM; |
Pablo Neira Ayuso | 0768b3b | 2014-02-19 17:27:06 +0100 | [diff] [blame] | 1977 | rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1978 | if (rule == NULL) |
| 1979 | goto err1; |
| 1980 | |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 1981 | nft_rule_activate_next(net, rule); |
| 1982 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1983 | rule->handle = handle; |
| 1984 | rule->dlen = size; |
Pablo Neira Ayuso | 0768b3b | 2014-02-19 17:27:06 +0100 | [diff] [blame] | 1985 | rule->ulen = ulen; |
| 1986 | |
| 1987 | if (ulen) |
| 1988 | nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1989 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1990 | expr = nft_expr_first(rule); |
| 1991 | for (i = 0; i < n; i++) { |
| 1992 | err = nf_tables_newexpr(&ctx, &info[i], expr); |
| 1993 | if (err < 0) |
| 1994 | goto err2; |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1995 | info[i].ops = NULL; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1996 | expr = nft_expr_next(expr); |
| 1997 | } |
| 1998 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1999 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2000 | if (nft_rule_is_active_next(net, old_rule)) { |
Pablo Neira Ayuso | ac904ac | 2014-06-10 10:53:03 +0200 | [diff] [blame] | 2001 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 2002 | old_rule); |
Pablo Neira Ayuso | 1081d11 | 2014-04-04 01:24:07 +0200 | [diff] [blame] | 2003 | if (trans == NULL) { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2004 | err = -ENOMEM; |
| 2005 | goto err2; |
| 2006 | } |
Arturo Borrero | ee01d54 | 2014-09-02 16:42:25 +0200 | [diff] [blame] | 2007 | nft_rule_deactivate_next(net, old_rule); |
Pablo Neira Ayuso | ac34b86 | 2014-06-10 10:53:02 +0200 | [diff] [blame] | 2008 | chain->use--; |
Pablo Neira Ayuso | 5bc5c30 | 2014-06-10 10:53:00 +0200 | [diff] [blame] | 2009 | list_add_tail_rcu(&rule->list, &old_rule->list); |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2010 | } else { |
| 2011 | err = -ENOENT; |
| 2012 | goto err2; |
| 2013 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2014 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 2015 | if (old_rule) |
| 2016 | list_add_rcu(&rule->list, &old_rule->list); |
| 2017 | else |
| 2018 | list_add_tail_rcu(&rule->list, &chain->rules); |
| 2019 | else { |
| 2020 | if (old_rule) |
| 2021 | list_add_tail_rcu(&rule->list, &old_rule->list); |
| 2022 | else |
| 2023 | list_add_rcu(&rule->list, &chain->rules); |
| 2024 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2025 | |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 2026 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2027 | err = -ENOMEM; |
| 2028 | goto err3; |
| 2029 | } |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 2030 | chain->use++; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2031 | return 0; |
| 2032 | |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2033 | err3: |
| 2034 | list_del_rcu(&rule->list); |
Pablo Neira Ayuso | 1081d11 | 2014-04-04 01:24:07 +0200 | [diff] [blame] | 2035 | if (trans) { |
| 2036 | list_del_rcu(&nft_trans_rule(trans)->list); |
| 2037 | nft_rule_clear(net, nft_trans_rule(trans)); |
| 2038 | nft_trans_destroy(trans); |
Pablo Neira Ayuso | ac34b86 | 2014-06-10 10:53:02 +0200 | [diff] [blame] | 2039 | chain->use++; |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2040 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2041 | err2: |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 2042 | nf_tables_rule_destroy(&ctx, rule); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2043 | err1: |
| 2044 | for (i = 0; i < n; i++) { |
| 2045 | if (info[i].ops != NULL) |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 2046 | module_put(info[i].ops->type->owner); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2047 | } |
| 2048 | return err; |
| 2049 | } |
| 2050 | |
| 2051 | static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb, |
| 2052 | const struct nlmsghdr *nlh, |
| 2053 | const struct nlattr * const nla[]) |
| 2054 | { |
| 2055 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2056 | struct nft_af_info *afi; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2057 | struct net *net = sock_net(skb->sk); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2058 | struct nft_table *table; |
Pablo Neira Ayuso | cf9dc09 | 2013-11-24 20:39:10 +0100 | [diff] [blame] | 2059 | struct nft_chain *chain = NULL; |
| 2060 | struct nft_rule *rule; |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2061 | int family = nfmsg->nfgen_family, err = 0; |
| 2062 | struct nft_ctx ctx; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2063 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2064 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2065 | if (IS_ERR(afi)) |
| 2066 | return PTR_ERR(afi); |
| 2067 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 2068 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2069 | if (IS_ERR(table)) |
| 2070 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 2071 | if (table->flags & NFT_TABLE_INACTIVE) |
| 2072 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2073 | |
Pablo Neira Ayuso | cf9dc09 | 2013-11-24 20:39:10 +0100 | [diff] [blame] | 2074 | if (nla[NFTA_RULE_CHAIN]) { |
| 2075 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| 2076 | if (IS_ERR(chain)) |
| 2077 | return PTR_ERR(chain); |
| 2078 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2079 | |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2080 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
| 2081 | |
Pablo Neira Ayuso | cf9dc09 | 2013-11-24 20:39:10 +0100 | [diff] [blame] | 2082 | if (chain) { |
| 2083 | if (nla[NFTA_RULE_HANDLE]) { |
| 2084 | rule = nf_tables_rule_lookup(chain, |
| 2085 | nla[NFTA_RULE_HANDLE]); |
| 2086 | if (IS_ERR(rule)) |
| 2087 | return PTR_ERR(rule); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2088 | |
Arturo Borrero | 5e266fe | 2014-09-02 16:42:21 +0200 | [diff] [blame] | 2089 | err = nft_delrule(&ctx, rule); |
Pablo Neira Ayuso | cf9dc09 | 2013-11-24 20:39:10 +0100 | [diff] [blame] | 2090 | } else { |
Arturo Borrero | ce24b72 | 2014-09-02 16:42:24 +0200 | [diff] [blame] | 2091 | err = nft_delrule_by_chain(&ctx); |
Pablo Neira Ayuso | cf9dc09 | 2013-11-24 20:39:10 +0100 | [diff] [blame] | 2092 | } |
| 2093 | } else { |
| 2094 | list_for_each_entry(chain, &table->chains, list) { |
| 2095 | ctx.chain = chain; |
Arturo Borrero | ce24b72 | 2014-09-02 16:42:24 +0200 | [diff] [blame] | 2096 | err = nft_delrule_by_chain(&ctx); |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2097 | if (err < 0) |
| 2098 | break; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2099 | } |
| 2100 | } |
| 2101 | |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2102 | return err; |
| 2103 | } |
| 2104 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2105 | /* |
| 2106 | * Sets |
| 2107 | */ |
| 2108 | |
| 2109 | static LIST_HEAD(nf_tables_set_ops); |
| 2110 | |
| 2111 | int nft_register_set(struct nft_set_ops *ops) |
| 2112 | { |
| 2113 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2114 | list_add_tail_rcu(&ops->list, &nf_tables_set_ops); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2115 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 2116 | return 0; |
| 2117 | } |
| 2118 | EXPORT_SYMBOL_GPL(nft_register_set); |
| 2119 | |
| 2120 | void nft_unregister_set(struct nft_set_ops *ops) |
| 2121 | { |
| 2122 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2123 | list_del_rcu(&ops->list); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2124 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 2125 | } |
| 2126 | EXPORT_SYMBOL_GPL(nft_unregister_set); |
| 2127 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2128 | /* |
| 2129 | * Select a set implementation based on the data characteristics and the |
| 2130 | * given policy. The total memory use might not be known if no size is |
| 2131 | * given, in that case the amount of memory per element is used. |
| 2132 | */ |
| 2133 | static const struct nft_set_ops * |
| 2134 | nft_select_set_ops(const struct nlattr * const nla[], |
| 2135 | const struct nft_set_desc *desc, |
| 2136 | enum nft_set_policies policy) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2137 | { |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2138 | const struct nft_set_ops *ops, *bops; |
| 2139 | struct nft_set_estimate est, best; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2140 | u32 features; |
| 2141 | |
| 2142 | #ifdef CONFIG_MODULES |
| 2143 | if (list_empty(&nf_tables_set_ops)) { |
| 2144 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 2145 | request_module("nft-set"); |
| 2146 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 2147 | if (!list_empty(&nf_tables_set_ops)) |
| 2148 | return ERR_PTR(-EAGAIN); |
| 2149 | } |
| 2150 | #endif |
| 2151 | features = 0; |
| 2152 | if (nla[NFTA_SET_FLAGS] != NULL) { |
| 2153 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); |
| 2154 | features &= NFT_SET_INTERVAL | NFT_SET_MAP; |
| 2155 | } |
| 2156 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2157 | bops = NULL; |
| 2158 | best.size = ~0; |
| 2159 | best.class = ~0; |
| 2160 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2161 | list_for_each_entry(ops, &nf_tables_set_ops, list) { |
| 2162 | if ((ops->features & features) != features) |
| 2163 | continue; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2164 | if (!ops->estimate(desc, features, &est)) |
| 2165 | continue; |
| 2166 | |
| 2167 | switch (policy) { |
| 2168 | case NFT_SET_POL_PERFORMANCE: |
| 2169 | if (est.class < best.class) |
| 2170 | break; |
| 2171 | if (est.class == best.class && est.size < best.size) |
| 2172 | break; |
| 2173 | continue; |
| 2174 | case NFT_SET_POL_MEMORY: |
| 2175 | if (est.size < best.size) |
| 2176 | break; |
| 2177 | if (est.size == best.size && est.class < best.class) |
| 2178 | break; |
| 2179 | continue; |
| 2180 | default: |
| 2181 | break; |
| 2182 | } |
| 2183 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2184 | if (!try_module_get(ops->owner)) |
| 2185 | continue; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2186 | if (bops != NULL) |
| 2187 | module_put(bops->owner); |
| 2188 | |
| 2189 | bops = ops; |
| 2190 | best = est; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2191 | } |
| 2192 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2193 | if (bops != NULL) |
| 2194 | return bops; |
| 2195 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2196 | return ERR_PTR(-EOPNOTSUPP); |
| 2197 | } |
| 2198 | |
| 2199 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { |
| 2200 | [NFTA_SET_TABLE] = { .type = NLA_STRING }, |
Pablo Neira Ayuso | a9bdd83 | 2014-03-24 15:10:37 +0100 | [diff] [blame] | 2201 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
| 2202 | .len = IFNAMSIZ - 1 }, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2203 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
| 2204 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, |
| 2205 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, |
| 2206 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, |
| 2207 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2208 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
| 2209 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2210 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2211 | }; |
| 2212 | |
| 2213 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { |
| 2214 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2215 | }; |
| 2216 | |
| 2217 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, |
| 2218 | const struct sk_buff *skb, |
| 2219 | const struct nlmsghdr *nlh, |
| 2220 | const struct nlattr * const nla[]) |
| 2221 | { |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2222 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2223 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2224 | struct nft_af_info *afi = NULL; |
| 2225 | struct nft_table *table = NULL; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2226 | |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2227 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
| 2228 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
| 2229 | if (IS_ERR(afi)) |
| 2230 | return PTR_ERR(afi); |
| 2231 | } |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2232 | |
| 2233 | if (nla[NFTA_SET_TABLE] != NULL) { |
Patrick McHardy | ec2c993 | 2014-02-05 15:03:35 +0000 | [diff] [blame] | 2234 | if (afi == NULL) |
| 2235 | return -EAFNOSUPPORT; |
| 2236 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 2237 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2238 | if (IS_ERR(table)) |
| 2239 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 2240 | if (table->flags & NFT_TABLE_INACTIVE) |
| 2241 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2242 | } |
| 2243 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 2244 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2245 | return 0; |
| 2246 | } |
| 2247 | |
| 2248 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, |
| 2249 | const struct nlattr *nla) |
| 2250 | { |
| 2251 | struct nft_set *set; |
| 2252 | |
| 2253 | if (nla == NULL) |
| 2254 | return ERR_PTR(-EINVAL); |
| 2255 | |
| 2256 | list_for_each_entry(set, &table->sets, list) { |
| 2257 | if (!nla_strcmp(nla, set->name)) |
| 2258 | return set; |
| 2259 | } |
| 2260 | return ERR_PTR(-ENOENT); |
| 2261 | } |
| 2262 | |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2263 | struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
| 2264 | const struct nlattr *nla) |
| 2265 | { |
| 2266 | struct nft_trans *trans; |
| 2267 | u32 id = ntohl(nla_get_be32(nla)); |
| 2268 | |
| 2269 | list_for_each_entry(trans, &net->nft.commit_list, list) { |
| 2270 | if (trans->msg_type == NFT_MSG_NEWSET && |
| 2271 | id == nft_trans_set_id(trans)) |
| 2272 | return nft_trans_set(trans); |
| 2273 | } |
| 2274 | return ERR_PTR(-ENOENT); |
| 2275 | } |
| 2276 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2277 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
| 2278 | const char *name) |
| 2279 | { |
| 2280 | const struct nft_set *i; |
| 2281 | const char *p; |
| 2282 | unsigned long *inuse; |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2283 | unsigned int n = 0, min = 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2284 | |
| 2285 | p = strnchr(name, IFNAMSIZ, '%'); |
| 2286 | if (p != NULL) { |
| 2287 | if (p[1] != 'd' || strchr(p + 2, '%')) |
| 2288 | return -EINVAL; |
| 2289 | |
| 2290 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); |
| 2291 | if (inuse == NULL) |
| 2292 | return -ENOMEM; |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2293 | cont: |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2294 | list_for_each_entry(i, &ctx->table->sets, list) { |
Daniel Borkmann | 1466291 | 2013-12-31 12:40:05 +0100 | [diff] [blame] | 2295 | int tmp; |
| 2296 | |
| 2297 | if (!sscanf(i->name, name, &tmp)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2298 | continue; |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2299 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2300 | continue; |
Daniel Borkmann | 1466291 | 2013-12-31 12:40:05 +0100 | [diff] [blame] | 2301 | |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2302 | set_bit(tmp - min, inuse); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2303 | } |
| 2304 | |
Patrick McHardy | 53b7028 | 2014-02-05 12:26:22 +0100 | [diff] [blame] | 2305 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2306 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
| 2307 | min += BITS_PER_BYTE * PAGE_SIZE; |
| 2308 | memset(inuse, 0, PAGE_SIZE); |
| 2309 | goto cont; |
| 2310 | } |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2311 | free_page((unsigned long)inuse); |
| 2312 | } |
| 2313 | |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2314 | snprintf(set->name, sizeof(set->name), name, min + n); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2315 | list_for_each_entry(i, &ctx->table->sets, list) { |
| 2316 | if (!strcmp(set->name, i->name)) |
| 2317 | return -ENFILE; |
| 2318 | } |
| 2319 | return 0; |
| 2320 | } |
| 2321 | |
| 2322 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, |
| 2323 | const struct nft_set *set, u16 event, u16 flags) |
| 2324 | { |
| 2325 | struct nfgenmsg *nfmsg; |
| 2326 | struct nlmsghdr *nlh; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2327 | struct nlattr *desc; |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 2328 | u32 portid = ctx->portid; |
| 2329 | u32 seq = ctx->seq; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2330 | |
| 2331 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 2332 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
| 2333 | flags); |
| 2334 | if (nlh == NULL) |
| 2335 | goto nla_put_failure; |
| 2336 | |
| 2337 | nfmsg = nlmsg_data(nlh); |
| 2338 | nfmsg->nfgen_family = ctx->afi->family; |
| 2339 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 2340 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2341 | |
| 2342 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) |
| 2343 | goto nla_put_failure; |
| 2344 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) |
| 2345 | goto nla_put_failure; |
| 2346 | if (set->flags != 0) |
| 2347 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) |
| 2348 | goto nla_put_failure; |
| 2349 | |
| 2350 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) |
| 2351 | goto nla_put_failure; |
| 2352 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) |
| 2353 | goto nla_put_failure; |
| 2354 | if (set->flags & NFT_SET_MAP) { |
| 2355 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) |
| 2356 | goto nla_put_failure; |
| 2357 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) |
| 2358 | goto nla_put_failure; |
| 2359 | } |
| 2360 | |
Arturo Borrero | 9363dc4 | 2014-09-23 13:30:41 +0200 | [diff] [blame] | 2361 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
| 2362 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) |
| 2363 | goto nla_put_failure; |
| 2364 | } |
| 2365 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2366 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
| 2367 | if (desc == NULL) |
| 2368 | goto nla_put_failure; |
| 2369 | if (set->size && |
| 2370 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) |
| 2371 | goto nla_put_failure; |
| 2372 | nla_nest_end(skb, desc); |
| 2373 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 2374 | nlmsg_end(skb, nlh); |
| 2375 | return 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2376 | |
| 2377 | nla_put_failure: |
| 2378 | nlmsg_trim(skb, nlh); |
| 2379 | return -1; |
| 2380 | } |
| 2381 | |
| 2382 | static int nf_tables_set_notify(const struct nft_ctx *ctx, |
| 2383 | const struct nft_set *set, |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 2384 | int event, gfp_t gfp_flags) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2385 | { |
| 2386 | struct sk_buff *skb; |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 2387 | u32 portid = ctx->portid; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2388 | int err; |
| 2389 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 2390 | if (!ctx->report && |
| 2391 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2392 | return 0; |
| 2393 | |
| 2394 | err = -ENOBUFS; |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 2395 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2396 | if (skb == NULL) |
| 2397 | goto err; |
| 2398 | |
| 2399 | err = nf_tables_fill_set(skb, ctx, set, event, 0); |
| 2400 | if (err < 0) { |
| 2401 | kfree_skb(skb); |
| 2402 | goto err; |
| 2403 | } |
| 2404 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 2405 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 2406 | ctx->report, gfp_flags); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2407 | err: |
| 2408 | if (err < 0) |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2409 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2410 | return err; |
| 2411 | } |
| 2412 | |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2413 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2414 | { |
| 2415 | const struct nft_set *set; |
| 2416 | unsigned int idx, s_idx = cb->args[0]; |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2417 | struct nft_af_info *afi; |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2418 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
| 2419 | struct net *net = sock_net(skb->sk); |
| 2420 | int cur_family = cb->args[3]; |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2421 | struct nft_ctx *ctx = cb->data, ctx_set; |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2422 | |
| 2423 | if (cb->args[1]) |
| 2424 | return skb->len; |
| 2425 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2426 | rcu_read_lock(); |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 2427 | cb->seq = net->nft.base_seq; |
| 2428 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2429 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2430 | if (ctx->afi && ctx->afi != afi) |
| 2431 | continue; |
| 2432 | |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2433 | if (cur_family) { |
| 2434 | if (afi->family != cur_family) |
| 2435 | continue; |
| 2436 | |
| 2437 | cur_family = 0; |
| 2438 | } |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2439 | list_for_each_entry_rcu(table, &afi->tables, list) { |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2440 | if (ctx->table && ctx->table != table) |
| 2441 | continue; |
| 2442 | |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2443 | if (cur_table) { |
| 2444 | if (cur_table != table) |
| 2445 | continue; |
| 2446 | |
| 2447 | cur_table = NULL; |
| 2448 | } |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2449 | idx = 0; |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2450 | list_for_each_entry_rcu(set, &table->sets, list) { |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2451 | if (idx < s_idx) |
| 2452 | goto cont; |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2453 | |
| 2454 | ctx_set = *ctx; |
| 2455 | ctx_set.table = table; |
| 2456 | ctx_set.afi = afi; |
| 2457 | if (nf_tables_fill_set(skb, &ctx_set, set, |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2458 | NFT_MSG_NEWSET, |
| 2459 | NLM_F_MULTI) < 0) { |
| 2460 | cb->args[0] = idx; |
| 2461 | cb->args[2] = (unsigned long) table; |
| 2462 | cb->args[3] = afi->family; |
| 2463 | goto done; |
| 2464 | } |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 2465 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2466 | cont: |
| 2467 | idx++; |
| 2468 | } |
| 2469 | if (s_idx) |
| 2470 | s_idx = 0; |
| 2471 | } |
| 2472 | } |
| 2473 | cb->args[1] = 1; |
| 2474 | done: |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2475 | rcu_read_unlock(); |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2476 | return skb->len; |
| 2477 | } |
| 2478 | |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2479 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2480 | { |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2481 | kfree(cb->data); |
| 2482 | return 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2483 | } |
| 2484 | |
| 2485 | static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb, |
| 2486 | const struct nlmsghdr *nlh, |
| 2487 | const struct nlattr * const nla[]) |
| 2488 | { |
| 2489 | const struct nft_set *set; |
| 2490 | struct nft_ctx ctx; |
| 2491 | struct sk_buff *skb2; |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2492 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2493 | int err; |
| 2494 | |
stephen hemminger | 01cfa0a | 2014-10-29 22:57:19 -0700 | [diff] [blame] | 2495 | /* Verify existence before starting dump */ |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2496 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); |
| 2497 | if (err < 0) |
| 2498 | return err; |
| 2499 | |
| 2500 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 2501 | struct netlink_dump_control c = { |
| 2502 | .dump = nf_tables_dump_sets, |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2503 | .done = nf_tables_dump_sets_done, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2504 | }; |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2505 | struct nft_ctx *ctx_dump; |
| 2506 | |
| 2507 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); |
| 2508 | if (ctx_dump == NULL) |
| 2509 | return -ENOMEM; |
| 2510 | |
| 2511 | *ctx_dump = ctx; |
| 2512 | c.data = ctx_dump; |
| 2513 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2514 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 2515 | } |
| 2516 | |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2517 | /* Only accept unspec with dump */ |
| 2518 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
| 2519 | return -EAFNOSUPPORT; |
| 2520 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2521 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
| 2522 | if (IS_ERR(set)) |
| 2523 | return PTR_ERR(set); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2524 | if (set->flags & NFT_SET_INACTIVE) |
| 2525 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2526 | |
| 2527 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 2528 | if (skb2 == NULL) |
| 2529 | return -ENOMEM; |
| 2530 | |
| 2531 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); |
| 2532 | if (err < 0) |
| 2533 | goto err; |
| 2534 | |
| 2535 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 2536 | |
| 2537 | err: |
| 2538 | kfree_skb(skb2); |
| 2539 | return err; |
| 2540 | } |
| 2541 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2542 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
| 2543 | struct nft_set_desc *desc, |
| 2544 | const struct nlattr *nla) |
| 2545 | { |
| 2546 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; |
| 2547 | int err; |
| 2548 | |
| 2549 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy); |
| 2550 | if (err < 0) |
| 2551 | return err; |
| 2552 | |
| 2553 | if (da[NFTA_SET_DESC_SIZE] != NULL) |
| 2554 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); |
| 2555 | |
| 2556 | return 0; |
| 2557 | } |
| 2558 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2559 | static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb, |
| 2560 | const struct nlmsghdr *nlh, |
| 2561 | const struct nlattr * const nla[]) |
| 2562 | { |
| 2563 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 2564 | const struct nft_set_ops *ops; |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2565 | struct nft_af_info *afi; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2566 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2567 | struct nft_table *table; |
| 2568 | struct nft_set *set; |
| 2569 | struct nft_ctx ctx; |
| 2570 | char name[IFNAMSIZ]; |
| 2571 | unsigned int size; |
| 2572 | bool create; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2573 | u32 ktype, dtype, flags, policy; |
| 2574 | struct nft_set_desc desc; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2575 | int err; |
| 2576 | |
| 2577 | if (nla[NFTA_SET_TABLE] == NULL || |
| 2578 | nla[NFTA_SET_NAME] == NULL || |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2579 | nla[NFTA_SET_KEY_LEN] == NULL || |
| 2580 | nla[NFTA_SET_ID] == NULL) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2581 | return -EINVAL; |
| 2582 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2583 | memset(&desc, 0, sizeof(desc)); |
| 2584 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2585 | ktype = NFT_DATA_VALUE; |
| 2586 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { |
| 2587 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); |
| 2588 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) |
| 2589 | return -EINVAL; |
| 2590 | } |
| 2591 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2592 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
| 2593 | if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2594 | return -EINVAL; |
| 2595 | |
| 2596 | flags = 0; |
| 2597 | if (nla[NFTA_SET_FLAGS] != NULL) { |
| 2598 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); |
| 2599 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | |
| 2600 | NFT_SET_INTERVAL | NFT_SET_MAP)) |
| 2601 | return -EINVAL; |
| 2602 | } |
| 2603 | |
| 2604 | dtype = 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2605 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
| 2606 | if (!(flags & NFT_SET_MAP)) |
| 2607 | return -EINVAL; |
| 2608 | |
| 2609 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); |
| 2610 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && |
| 2611 | dtype != NFT_DATA_VERDICT) |
| 2612 | return -EINVAL; |
| 2613 | |
| 2614 | if (dtype != NFT_DATA_VERDICT) { |
| 2615 | if (nla[NFTA_SET_DATA_LEN] == NULL) |
| 2616 | return -EINVAL; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2617 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
| 2618 | if (desc.dlen == 0 || |
| 2619 | desc.dlen > FIELD_SIZEOF(struct nft_data, data)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2620 | return -EINVAL; |
| 2621 | } else |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2622 | desc.dlen = sizeof(struct nft_data); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2623 | } else if (flags & NFT_SET_MAP) |
| 2624 | return -EINVAL; |
| 2625 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2626 | policy = NFT_SET_POL_PERFORMANCE; |
| 2627 | if (nla[NFTA_SET_POLICY] != NULL) |
| 2628 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); |
| 2629 | |
| 2630 | if (nla[NFTA_SET_DESC] != NULL) { |
| 2631 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); |
| 2632 | if (err < 0) |
| 2633 | return err; |
| 2634 | } |
| 2635 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2636 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| 2637 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2638 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2639 | if (IS_ERR(afi)) |
| 2640 | return PTR_ERR(afi); |
| 2641 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 2642 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2643 | if (IS_ERR(table)) |
| 2644 | return PTR_ERR(table); |
| 2645 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 2646 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2647 | |
| 2648 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); |
| 2649 | if (IS_ERR(set)) { |
| 2650 | if (PTR_ERR(set) != -ENOENT) |
| 2651 | return PTR_ERR(set); |
| 2652 | set = NULL; |
| 2653 | } |
| 2654 | |
| 2655 | if (set != NULL) { |
| 2656 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 2657 | return -EEXIST; |
| 2658 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 2659 | return -EOPNOTSUPP; |
| 2660 | return 0; |
| 2661 | } |
| 2662 | |
| 2663 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) |
| 2664 | return -ENOENT; |
| 2665 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2666 | ops = nft_select_set_ops(nla, &desc, policy); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2667 | if (IS_ERR(ops)) |
| 2668 | return PTR_ERR(ops); |
| 2669 | |
| 2670 | size = 0; |
| 2671 | if (ops->privsize != NULL) |
| 2672 | size = ops->privsize(nla); |
| 2673 | |
| 2674 | err = -ENOMEM; |
| 2675 | set = kzalloc(sizeof(*set) + size, GFP_KERNEL); |
| 2676 | if (set == NULL) |
| 2677 | goto err1; |
| 2678 | |
| 2679 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); |
| 2680 | err = nf_tables_set_alloc_name(&ctx, set, name); |
| 2681 | if (err < 0) |
| 2682 | goto err2; |
| 2683 | |
| 2684 | INIT_LIST_HEAD(&set->bindings); |
| 2685 | set->ops = ops; |
| 2686 | set->ktype = ktype; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2687 | set->klen = desc.klen; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2688 | set->dtype = dtype; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2689 | set->dlen = desc.dlen; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2690 | set->flags = flags; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2691 | set->size = desc.size; |
Arturo Borrero | 9363dc4 | 2014-09-23 13:30:41 +0200 | [diff] [blame] | 2692 | set->policy = policy; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2693 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2694 | err = ops->init(set, &desc, nla); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2695 | if (err < 0) |
| 2696 | goto err2; |
| 2697 | |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2698 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2699 | if (err < 0) |
| 2700 | goto err2; |
| 2701 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2702 | list_add_tail_rcu(&set->list, &table->sets); |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 2703 | table->use++; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2704 | return 0; |
| 2705 | |
| 2706 | err2: |
| 2707 | kfree(set); |
| 2708 | err1: |
| 2709 | module_put(ops->owner); |
| 2710 | return err; |
| 2711 | } |
| 2712 | |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2713 | static void nft_set_destroy(struct nft_set *set) |
| 2714 | { |
| 2715 | set->ops->destroy(set); |
| 2716 | module_put(set->ops->owner); |
| 2717 | kfree(set); |
| 2718 | } |
| 2719 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2720 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
| 2721 | { |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2722 | list_del_rcu(&set->list); |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 2723 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2724 | nft_set_destroy(set); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2725 | } |
| 2726 | |
| 2727 | static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb, |
| 2728 | const struct nlmsghdr *nlh, |
| 2729 | const struct nlattr * const nla[]) |
| 2730 | { |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2731 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2732 | struct nft_set *set; |
| 2733 | struct nft_ctx ctx; |
| 2734 | int err; |
| 2735 | |
Patrick McHardy | ec2c993 | 2014-02-05 15:03:35 +0000 | [diff] [blame] | 2736 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
| 2737 | return -EAFNOSUPPORT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2738 | if (nla[NFTA_SET_TABLE] == NULL) |
| 2739 | return -EINVAL; |
| 2740 | |
| 2741 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); |
| 2742 | if (err < 0) |
| 2743 | return err; |
| 2744 | |
| 2745 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
| 2746 | if (IS_ERR(set)) |
| 2747 | return PTR_ERR(set); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2748 | if (set->flags & NFT_SET_INACTIVE) |
| 2749 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2750 | if (!list_empty(&set->bindings)) |
| 2751 | return -EBUSY; |
| 2752 | |
Arturo Borrero | ee01d54 | 2014-09-02 16:42:25 +0200 | [diff] [blame] | 2753 | return nft_delset(&ctx, set); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2754 | } |
| 2755 | |
| 2756 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, |
| 2757 | const struct nft_set *set, |
| 2758 | const struct nft_set_iter *iter, |
| 2759 | const struct nft_set_elem *elem) |
| 2760 | { |
| 2761 | enum nft_registers dreg; |
| 2762 | |
| 2763 | dreg = nft_type_to_reg(set->dtype); |
Pablo Neira Ayuso | 2ee0d3c | 2013-12-28 00:59:38 +0100 | [diff] [blame] | 2764 | return nft_validate_data_load(ctx, dreg, &elem->data, |
| 2765 | set->dtype == NFT_DATA_VERDICT ? |
| 2766 | NFT_DATA_VERDICT : NFT_DATA_VALUE); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2767 | } |
| 2768 | |
| 2769 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, |
| 2770 | struct nft_set_binding *binding) |
| 2771 | { |
| 2772 | struct nft_set_binding *i; |
| 2773 | struct nft_set_iter iter; |
| 2774 | |
| 2775 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) |
| 2776 | return -EBUSY; |
| 2777 | |
| 2778 | if (set->flags & NFT_SET_MAP) { |
| 2779 | /* If the set is already bound to the same chain all |
| 2780 | * jumps are already validated for that chain. |
| 2781 | */ |
| 2782 | list_for_each_entry(i, &set->bindings, list) { |
| 2783 | if (i->chain == binding->chain) |
| 2784 | goto bind; |
| 2785 | } |
| 2786 | |
| 2787 | iter.skip = 0; |
| 2788 | iter.count = 0; |
| 2789 | iter.err = 0; |
| 2790 | iter.fn = nf_tables_bind_check_setelem; |
| 2791 | |
| 2792 | set->ops->walk(ctx, set, &iter); |
| 2793 | if (iter.err < 0) { |
| 2794 | /* Destroy anonymous sets if binding fails */ |
| 2795 | if (set->flags & NFT_SET_ANONYMOUS) |
| 2796 | nf_tables_set_destroy(ctx, set); |
| 2797 | |
| 2798 | return iter.err; |
| 2799 | } |
| 2800 | } |
| 2801 | bind: |
| 2802 | binding->chain = ctx->chain; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2803 | list_add_tail_rcu(&binding->list, &set->bindings); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2804 | return 0; |
| 2805 | } |
| 2806 | |
| 2807 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, |
| 2808 | struct nft_set_binding *binding) |
| 2809 | { |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2810 | list_del_rcu(&binding->list); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2811 | |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2812 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
| 2813 | !(set->flags & NFT_SET_INACTIVE)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2814 | nf_tables_set_destroy(ctx, set); |
| 2815 | } |
| 2816 | |
| 2817 | /* |
| 2818 | * Set elements |
| 2819 | */ |
| 2820 | |
| 2821 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { |
| 2822 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, |
| 2823 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, |
| 2824 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, |
| 2825 | }; |
| 2826 | |
| 2827 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { |
| 2828 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING }, |
| 2829 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING }, |
| 2830 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2831 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2832 | }; |
| 2833 | |
| 2834 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, |
| 2835 | const struct sk_buff *skb, |
| 2836 | const struct nlmsghdr *nlh, |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 2837 | const struct nlattr * const nla[], |
| 2838 | bool trans) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2839 | { |
| 2840 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2841 | struct nft_af_info *afi; |
| 2842 | struct nft_table *table; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2843 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2844 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2845 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2846 | if (IS_ERR(afi)) |
| 2847 | return PTR_ERR(afi); |
| 2848 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 2849 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2850 | if (IS_ERR(table)) |
| 2851 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 2852 | if (!trans && (table->flags & NFT_TABLE_INACTIVE)) |
| 2853 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2854 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 2855 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2856 | return 0; |
| 2857 | } |
| 2858 | |
| 2859 | static int nf_tables_fill_setelem(struct sk_buff *skb, |
| 2860 | const struct nft_set *set, |
| 2861 | const struct nft_set_elem *elem) |
| 2862 | { |
| 2863 | unsigned char *b = skb_tail_pointer(skb); |
| 2864 | struct nlattr *nest; |
| 2865 | |
| 2866 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); |
| 2867 | if (nest == NULL) |
| 2868 | goto nla_put_failure; |
| 2869 | |
| 2870 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE, |
| 2871 | set->klen) < 0) |
| 2872 | goto nla_put_failure; |
| 2873 | |
| 2874 | if (set->flags & NFT_SET_MAP && |
| 2875 | !(elem->flags & NFT_SET_ELEM_INTERVAL_END) && |
| 2876 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data, |
| 2877 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
| 2878 | set->dlen) < 0) |
| 2879 | goto nla_put_failure; |
| 2880 | |
| 2881 | if (elem->flags != 0) |
| 2882 | if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags))) |
| 2883 | goto nla_put_failure; |
| 2884 | |
| 2885 | nla_nest_end(skb, nest); |
| 2886 | return 0; |
| 2887 | |
| 2888 | nla_put_failure: |
| 2889 | nlmsg_trim(skb, b); |
| 2890 | return -EMSGSIZE; |
| 2891 | } |
| 2892 | |
| 2893 | struct nft_set_dump_args { |
| 2894 | const struct netlink_callback *cb; |
| 2895 | struct nft_set_iter iter; |
| 2896 | struct sk_buff *skb; |
| 2897 | }; |
| 2898 | |
| 2899 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, |
| 2900 | const struct nft_set *set, |
| 2901 | const struct nft_set_iter *iter, |
| 2902 | const struct nft_set_elem *elem) |
| 2903 | { |
| 2904 | struct nft_set_dump_args *args; |
| 2905 | |
| 2906 | args = container_of(iter, struct nft_set_dump_args, iter); |
| 2907 | return nf_tables_fill_setelem(args->skb, set, elem); |
| 2908 | } |
| 2909 | |
| 2910 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
| 2911 | { |
| 2912 | const struct nft_set *set; |
| 2913 | struct nft_set_dump_args args; |
| 2914 | struct nft_ctx ctx; |
| 2915 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; |
| 2916 | struct nfgenmsg *nfmsg; |
| 2917 | struct nlmsghdr *nlh; |
| 2918 | struct nlattr *nest; |
| 2919 | u32 portid, seq; |
| 2920 | int event, err; |
| 2921 | |
Michal Nazarewicz | 720e0df | 2014-01-01 06:27:19 +0100 | [diff] [blame] | 2922 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
| 2923 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2924 | if (err < 0) |
| 2925 | return err; |
| 2926 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 2927 | err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla, |
| 2928 | false); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2929 | if (err < 0) |
| 2930 | return err; |
| 2931 | |
| 2932 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| 2933 | if (IS_ERR(set)) |
| 2934 | return PTR_ERR(set); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2935 | if (set->flags & NFT_SET_INACTIVE) |
| 2936 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2937 | |
| 2938 | event = NFT_MSG_NEWSETELEM; |
| 2939 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 2940 | portid = NETLINK_CB(cb->skb).portid; |
| 2941 | seq = cb->nlh->nlmsg_seq; |
| 2942 | |
| 2943 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
| 2944 | NLM_F_MULTI); |
| 2945 | if (nlh == NULL) |
| 2946 | goto nla_put_failure; |
| 2947 | |
| 2948 | nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 6403d96 | 2014-06-11 19:05:28 +0200 | [diff] [blame] | 2949 | nfmsg->nfgen_family = ctx.afi->family; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2950 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 2951 | nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2952 | |
| 2953 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) |
| 2954 | goto nla_put_failure; |
| 2955 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) |
| 2956 | goto nla_put_failure; |
| 2957 | |
| 2958 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); |
| 2959 | if (nest == NULL) |
| 2960 | goto nla_put_failure; |
| 2961 | |
| 2962 | args.cb = cb; |
| 2963 | args.skb = skb; |
| 2964 | args.iter.skip = cb->args[0]; |
| 2965 | args.iter.count = 0; |
| 2966 | args.iter.err = 0; |
| 2967 | args.iter.fn = nf_tables_dump_setelem; |
| 2968 | set->ops->walk(&ctx, set, &args.iter); |
| 2969 | |
| 2970 | nla_nest_end(skb, nest); |
| 2971 | nlmsg_end(skb, nlh); |
| 2972 | |
| 2973 | if (args.iter.err && args.iter.err != -EMSGSIZE) |
| 2974 | return args.iter.err; |
| 2975 | if (args.iter.count == cb->args[0]) |
| 2976 | return 0; |
| 2977 | |
| 2978 | cb->args[0] = args.iter.count; |
| 2979 | return skb->len; |
| 2980 | |
| 2981 | nla_put_failure: |
| 2982 | return -ENOSPC; |
| 2983 | } |
| 2984 | |
| 2985 | static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb, |
| 2986 | const struct nlmsghdr *nlh, |
| 2987 | const struct nlattr * const nla[]) |
| 2988 | { |
| 2989 | const struct nft_set *set; |
| 2990 | struct nft_ctx ctx; |
| 2991 | int err; |
| 2992 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 2993 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2994 | if (err < 0) |
| 2995 | return err; |
| 2996 | |
| 2997 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| 2998 | if (IS_ERR(set)) |
| 2999 | return PTR_ERR(set); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3000 | if (set->flags & NFT_SET_INACTIVE) |
| 3001 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3002 | |
| 3003 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 3004 | struct netlink_dump_control c = { |
| 3005 | .dump = nf_tables_dump_set, |
| 3006 | }; |
| 3007 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 3008 | } |
| 3009 | return -EOPNOTSUPP; |
| 3010 | } |
| 3011 | |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3012 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
| 3013 | const struct nft_ctx *ctx, u32 seq, |
| 3014 | u32 portid, int event, u16 flags, |
| 3015 | const struct nft_set *set, |
| 3016 | const struct nft_set_elem *elem) |
| 3017 | { |
| 3018 | struct nfgenmsg *nfmsg; |
| 3019 | struct nlmsghdr *nlh; |
| 3020 | struct nlattr *nest; |
| 3021 | int err; |
| 3022 | |
| 3023 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 3024 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
| 3025 | flags); |
| 3026 | if (nlh == NULL) |
| 3027 | goto nla_put_failure; |
| 3028 | |
| 3029 | nfmsg = nlmsg_data(nlh); |
| 3030 | nfmsg->nfgen_family = ctx->afi->family; |
| 3031 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 3032 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3033 | |
| 3034 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) |
| 3035 | goto nla_put_failure; |
| 3036 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) |
| 3037 | goto nla_put_failure; |
| 3038 | |
| 3039 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); |
| 3040 | if (nest == NULL) |
| 3041 | goto nla_put_failure; |
| 3042 | |
| 3043 | err = nf_tables_fill_setelem(skb, set, elem); |
| 3044 | if (err < 0) |
| 3045 | goto nla_put_failure; |
| 3046 | |
| 3047 | nla_nest_end(skb, nest); |
| 3048 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 3049 | nlmsg_end(skb, nlh); |
| 3050 | return 0; |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3051 | |
| 3052 | nla_put_failure: |
| 3053 | nlmsg_trim(skb, nlh); |
| 3054 | return -1; |
| 3055 | } |
| 3056 | |
| 3057 | static int nf_tables_setelem_notify(const struct nft_ctx *ctx, |
| 3058 | const struct nft_set *set, |
| 3059 | const struct nft_set_elem *elem, |
| 3060 | int event, u16 flags) |
| 3061 | { |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 3062 | struct net *net = ctx->net; |
| 3063 | u32 portid = ctx->portid; |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3064 | struct sk_buff *skb; |
| 3065 | int err; |
| 3066 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 3067 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3068 | return 0; |
| 3069 | |
| 3070 | err = -ENOBUFS; |
| 3071 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 3072 | if (skb == NULL) |
| 3073 | goto err; |
| 3074 | |
| 3075 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, |
| 3076 | set, elem); |
| 3077 | if (err < 0) { |
| 3078 | kfree_skb(skb); |
| 3079 | goto err; |
| 3080 | } |
| 3081 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 3082 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3083 | GFP_KERNEL); |
| 3084 | err: |
| 3085 | if (err < 0) |
| 3086 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); |
| 3087 | return err; |
| 3088 | } |
| 3089 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3090 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
| 3091 | int msg_type, |
| 3092 | struct nft_set *set) |
| 3093 | { |
| 3094 | struct nft_trans *trans; |
| 3095 | |
| 3096 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); |
| 3097 | if (trans == NULL) |
| 3098 | return NULL; |
| 3099 | |
| 3100 | nft_trans_elem_set(trans) = set; |
| 3101 | return trans; |
| 3102 | } |
| 3103 | |
| 3104 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3105 | const struct nlattr *attr) |
| 3106 | { |
| 3107 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; |
| 3108 | struct nft_data_desc d1, d2; |
| 3109 | struct nft_set_elem elem; |
| 3110 | struct nft_set_binding *binding; |
| 3111 | enum nft_registers dreg; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3112 | struct nft_trans *trans; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3113 | int err; |
| 3114 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 3115 | if (set->size && set->nelems == set->size) |
| 3116 | return -ENFILE; |
| 3117 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3118 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, |
| 3119 | nft_set_elem_policy); |
| 3120 | if (err < 0) |
| 3121 | return err; |
| 3122 | |
| 3123 | if (nla[NFTA_SET_ELEM_KEY] == NULL) |
| 3124 | return -EINVAL; |
| 3125 | |
| 3126 | elem.flags = 0; |
| 3127 | if (nla[NFTA_SET_ELEM_FLAGS] != NULL) { |
| 3128 | elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS])); |
| 3129 | if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END) |
| 3130 | return -EINVAL; |
| 3131 | } |
| 3132 | |
| 3133 | if (set->flags & NFT_SET_MAP) { |
| 3134 | if (nla[NFTA_SET_ELEM_DATA] == NULL && |
| 3135 | !(elem.flags & NFT_SET_ELEM_INTERVAL_END)) |
| 3136 | return -EINVAL; |
Pablo Neira Ayuso | bd7fc64 | 2014-02-07 12:53:07 +0100 | [diff] [blame] | 3137 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
| 3138 | elem.flags & NFT_SET_ELEM_INTERVAL_END) |
| 3139 | return -EINVAL; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3140 | } else { |
| 3141 | if (nla[NFTA_SET_ELEM_DATA] != NULL) |
| 3142 | return -EINVAL; |
| 3143 | } |
| 3144 | |
| 3145 | err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]); |
| 3146 | if (err < 0) |
| 3147 | goto err1; |
| 3148 | err = -EINVAL; |
| 3149 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) |
| 3150 | goto err2; |
| 3151 | |
| 3152 | err = -EEXIST; |
| 3153 | if (set->ops->get(set, &elem) == 0) |
| 3154 | goto err2; |
| 3155 | |
| 3156 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
| 3157 | err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]); |
| 3158 | if (err < 0) |
| 3159 | goto err2; |
| 3160 | |
| 3161 | err = -EINVAL; |
| 3162 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) |
| 3163 | goto err3; |
| 3164 | |
| 3165 | dreg = nft_type_to_reg(set->dtype); |
| 3166 | list_for_each_entry(binding, &set->bindings, list) { |
| 3167 | struct nft_ctx bind_ctx = { |
| 3168 | .afi = ctx->afi, |
| 3169 | .table = ctx->table, |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 3170 | .chain = (struct nft_chain *)binding->chain, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3171 | }; |
| 3172 | |
| 3173 | err = nft_validate_data_load(&bind_ctx, dreg, |
| 3174 | &elem.data, d2.type); |
| 3175 | if (err < 0) |
| 3176 | goto err3; |
| 3177 | } |
| 3178 | } |
| 3179 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3180 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
| 3181 | if (trans == NULL) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3182 | goto err3; |
| 3183 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3184 | err = set->ops->insert(set, &elem); |
| 3185 | if (err < 0) |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3186 | goto err4; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3187 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3188 | nft_trans_elem(trans) = elem; |
Pablo Neira Ayuso | 46bbafc | 2014-05-22 12:36:03 +0200 | [diff] [blame] | 3189 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3190 | return 0; |
| 3191 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3192 | err4: |
| 3193 | kfree(trans); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3194 | err3: |
| 3195 | if (nla[NFTA_SET_ELEM_DATA] != NULL) |
| 3196 | nft_data_uninit(&elem.data, d2.type); |
| 3197 | err2: |
| 3198 | nft_data_uninit(&elem.key, d1.type); |
| 3199 | err1: |
| 3200 | return err; |
| 3201 | } |
| 3202 | |
| 3203 | static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb, |
| 3204 | const struct nlmsghdr *nlh, |
| 3205 | const struct nlattr * const nla[]) |
| 3206 | { |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3207 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3208 | const struct nlattr *attr; |
| 3209 | struct nft_set *set; |
| 3210 | struct nft_ctx ctx; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3211 | int rem, err = 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3212 | |
Pablo Neira Ayuso | 7d5570c | 2014-07-25 13:15:36 +0200 | [diff] [blame] | 3213 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
| 3214 | return -EINVAL; |
| 3215 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3216 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3217 | if (err < 0) |
| 3218 | return err; |
| 3219 | |
| 3220 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3221 | if (IS_ERR(set)) { |
| 3222 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { |
| 3223 | set = nf_tables_set_lookup_byid(net, |
| 3224 | nla[NFTA_SET_ELEM_LIST_SET_ID]); |
| 3225 | } |
| 3226 | if (IS_ERR(set)) |
| 3227 | return PTR_ERR(set); |
| 3228 | } |
| 3229 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3230 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
| 3231 | return -EBUSY; |
| 3232 | |
| 3233 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
| 3234 | err = nft_add_set_elem(&ctx, set, attr); |
| 3235 | if (err < 0) |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3236 | break; |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3237 | |
| 3238 | set->nelems++; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3239 | } |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3240 | return err; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3241 | } |
| 3242 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3243 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3244 | const struct nlattr *attr) |
| 3245 | { |
| 3246 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; |
| 3247 | struct nft_data_desc desc; |
| 3248 | struct nft_set_elem elem; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3249 | struct nft_trans *trans; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3250 | int err; |
| 3251 | |
| 3252 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, |
| 3253 | nft_set_elem_policy); |
| 3254 | if (err < 0) |
| 3255 | goto err1; |
| 3256 | |
| 3257 | err = -EINVAL; |
| 3258 | if (nla[NFTA_SET_ELEM_KEY] == NULL) |
| 3259 | goto err1; |
| 3260 | |
| 3261 | err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]); |
| 3262 | if (err < 0) |
| 3263 | goto err1; |
| 3264 | |
| 3265 | err = -EINVAL; |
| 3266 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) |
| 3267 | goto err2; |
| 3268 | |
| 3269 | err = set->ops->get(set, &elem); |
| 3270 | if (err < 0) |
| 3271 | goto err2; |
| 3272 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3273 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
Julia Lawall | 609ccf0 | 2014-08-07 14:49:08 +0200 | [diff] [blame] | 3274 | if (trans == NULL) { |
| 3275 | err = -ENOMEM; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3276 | goto err2; |
Julia Lawall | 609ccf0 | 2014-08-07 14:49:08 +0200 | [diff] [blame] | 3277 | } |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3278 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3279 | nft_trans_elem(trans) = elem; |
Pablo Neira Ayuso | 46bbafc | 2014-05-22 12:36:03 +0200 | [diff] [blame] | 3280 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
Thomas Graf | 0dc1362 | 2014-08-01 17:25:38 +0200 | [diff] [blame] | 3281 | return 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3282 | err2: |
| 3283 | nft_data_uninit(&elem.key, desc.type); |
| 3284 | err1: |
| 3285 | return err; |
| 3286 | } |
| 3287 | |
| 3288 | static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb, |
| 3289 | const struct nlmsghdr *nlh, |
| 3290 | const struct nlattr * const nla[]) |
| 3291 | { |
| 3292 | const struct nlattr *attr; |
| 3293 | struct nft_set *set; |
| 3294 | struct nft_ctx ctx; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3295 | int rem, err = 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3296 | |
Pablo Neira Ayuso | 7d5570c | 2014-07-25 13:15:36 +0200 | [diff] [blame] | 3297 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
| 3298 | return -EINVAL; |
| 3299 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3300 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3301 | if (err < 0) |
| 3302 | return err; |
| 3303 | |
| 3304 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| 3305 | if (IS_ERR(set)) |
| 3306 | return PTR_ERR(set); |
| 3307 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
| 3308 | return -EBUSY; |
| 3309 | |
| 3310 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
| 3311 | err = nft_del_setelem(&ctx, set, attr); |
| 3312 | if (err < 0) |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3313 | break; |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3314 | |
| 3315 | set->nelems--; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3316 | } |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3317 | return err; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3318 | } |
| 3319 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 3320 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
| 3321 | u32 portid, u32 seq) |
| 3322 | { |
| 3323 | struct nlmsghdr *nlh; |
| 3324 | struct nfgenmsg *nfmsg; |
| 3325 | int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN; |
| 3326 | |
| 3327 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); |
| 3328 | if (nlh == NULL) |
| 3329 | goto nla_put_failure; |
| 3330 | |
| 3331 | nfmsg = nlmsg_data(nlh); |
| 3332 | nfmsg->nfgen_family = AF_UNSPEC; |
| 3333 | nfmsg->version = NFNETLINK_V0; |
| 3334 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
| 3335 | |
| 3336 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq))) |
| 3337 | goto nla_put_failure; |
| 3338 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 3339 | nlmsg_end(skb, nlh); |
| 3340 | return 0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 3341 | |
| 3342 | nla_put_failure: |
| 3343 | nlmsg_trim(skb, nlh); |
| 3344 | return -EMSGSIZE; |
| 3345 | } |
| 3346 | |
| 3347 | static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event) |
| 3348 | { |
| 3349 | struct nlmsghdr *nlh = nlmsg_hdr(skb); |
| 3350 | struct sk_buff *skb2; |
| 3351 | int err; |
| 3352 | |
| 3353 | if (nlmsg_report(nlh) && |
| 3354 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
| 3355 | return 0; |
| 3356 | |
| 3357 | err = -ENOBUFS; |
| 3358 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 3359 | if (skb2 == NULL) |
| 3360 | goto err; |
| 3361 | |
| 3362 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, |
| 3363 | nlh->nlmsg_seq); |
| 3364 | if (err < 0) { |
| 3365 | kfree_skb(skb2); |
| 3366 | goto err; |
| 3367 | } |
| 3368 | |
| 3369 | err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, |
| 3370 | NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL); |
| 3371 | err: |
| 3372 | if (err < 0) { |
| 3373 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
| 3374 | err); |
| 3375 | } |
| 3376 | return err; |
| 3377 | } |
| 3378 | |
| 3379 | static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb, |
| 3380 | const struct nlmsghdr *nlh, |
| 3381 | const struct nlattr * const nla[]) |
| 3382 | { |
| 3383 | struct net *net = sock_net(skb->sk); |
| 3384 | struct sk_buff *skb2; |
| 3385 | int err; |
| 3386 | |
| 3387 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 3388 | if (skb2 == NULL) |
| 3389 | return -ENOMEM; |
| 3390 | |
| 3391 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, |
| 3392 | nlh->nlmsg_seq); |
| 3393 | if (err < 0) |
| 3394 | goto err; |
| 3395 | |
| 3396 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 3397 | err: |
| 3398 | kfree_skb(skb2); |
| 3399 | return err; |
| 3400 | } |
| 3401 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3402 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
| 3403 | [NFT_MSG_NEWTABLE] = { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3404 | .call_batch = nf_tables_newtable, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3405 | .attr_count = NFTA_TABLE_MAX, |
| 3406 | .policy = nft_table_policy, |
| 3407 | }, |
| 3408 | [NFT_MSG_GETTABLE] = { |
| 3409 | .call = nf_tables_gettable, |
| 3410 | .attr_count = NFTA_TABLE_MAX, |
| 3411 | .policy = nft_table_policy, |
| 3412 | }, |
| 3413 | [NFT_MSG_DELTABLE] = { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3414 | .call_batch = nf_tables_deltable, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3415 | .attr_count = NFTA_TABLE_MAX, |
| 3416 | .policy = nft_table_policy, |
| 3417 | }, |
| 3418 | [NFT_MSG_NEWCHAIN] = { |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3419 | .call_batch = nf_tables_newchain, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3420 | .attr_count = NFTA_CHAIN_MAX, |
| 3421 | .policy = nft_chain_policy, |
| 3422 | }, |
| 3423 | [NFT_MSG_GETCHAIN] = { |
| 3424 | .call = nf_tables_getchain, |
| 3425 | .attr_count = NFTA_CHAIN_MAX, |
| 3426 | .policy = nft_chain_policy, |
| 3427 | }, |
| 3428 | [NFT_MSG_DELCHAIN] = { |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3429 | .call_batch = nf_tables_delchain, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3430 | .attr_count = NFTA_CHAIN_MAX, |
| 3431 | .policy = nft_chain_policy, |
| 3432 | }, |
| 3433 | [NFT_MSG_NEWRULE] = { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 3434 | .call_batch = nf_tables_newrule, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3435 | .attr_count = NFTA_RULE_MAX, |
| 3436 | .policy = nft_rule_policy, |
| 3437 | }, |
| 3438 | [NFT_MSG_GETRULE] = { |
| 3439 | .call = nf_tables_getrule, |
| 3440 | .attr_count = NFTA_RULE_MAX, |
| 3441 | .policy = nft_rule_policy, |
| 3442 | }, |
| 3443 | [NFT_MSG_DELRULE] = { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 3444 | .call_batch = nf_tables_delrule, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3445 | .attr_count = NFTA_RULE_MAX, |
| 3446 | .policy = nft_rule_policy, |
| 3447 | }, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3448 | [NFT_MSG_NEWSET] = { |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3449 | .call_batch = nf_tables_newset, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3450 | .attr_count = NFTA_SET_MAX, |
| 3451 | .policy = nft_set_policy, |
| 3452 | }, |
| 3453 | [NFT_MSG_GETSET] = { |
| 3454 | .call = nf_tables_getset, |
| 3455 | .attr_count = NFTA_SET_MAX, |
| 3456 | .policy = nft_set_policy, |
| 3457 | }, |
| 3458 | [NFT_MSG_DELSET] = { |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3459 | .call_batch = nf_tables_delset, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3460 | .attr_count = NFTA_SET_MAX, |
| 3461 | .policy = nft_set_policy, |
| 3462 | }, |
| 3463 | [NFT_MSG_NEWSETELEM] = { |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3464 | .call_batch = nf_tables_newsetelem, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3465 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| 3466 | .policy = nft_set_elem_list_policy, |
| 3467 | }, |
| 3468 | [NFT_MSG_GETSETELEM] = { |
| 3469 | .call = nf_tables_getsetelem, |
| 3470 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| 3471 | .policy = nft_set_elem_list_policy, |
| 3472 | }, |
| 3473 | [NFT_MSG_DELSETELEM] = { |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3474 | .call_batch = nf_tables_delsetelem, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3475 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| 3476 | .policy = nft_set_elem_list_policy, |
| 3477 | }, |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 3478 | [NFT_MSG_GETGEN] = { |
| 3479 | .call = nf_tables_getgen, |
| 3480 | }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3481 | }; |
| 3482 | |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3483 | static void nft_chain_commit_update(struct nft_trans *trans) |
| 3484 | { |
| 3485 | struct nft_base_chain *basechain; |
| 3486 | |
| 3487 | if (nft_trans_chain_name(trans)[0]) |
| 3488 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); |
| 3489 | |
| 3490 | if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN)) |
| 3491 | return; |
| 3492 | |
| 3493 | basechain = nft_base_chain(trans->ctx.chain); |
| 3494 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); |
| 3495 | |
| 3496 | switch (nft_trans_chain_policy(trans)) { |
| 3497 | case NF_DROP: |
| 3498 | case NF_ACCEPT: |
| 3499 | basechain->policy = nft_trans_chain_policy(trans); |
| 3500 | break; |
| 3501 | } |
| 3502 | } |
| 3503 | |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3504 | static void nf_tables_commit_release(struct nft_trans *trans) |
Pablo Neira Ayuso | c7c32e7 | 2014-04-10 00:31:10 +0200 | [diff] [blame] | 3505 | { |
Pablo Neira Ayuso | c7c32e7 | 2014-04-10 00:31:10 +0200 | [diff] [blame] | 3506 | switch (trans->msg_type) { |
| 3507 | case NFT_MSG_DELTABLE: |
| 3508 | nf_tables_table_destroy(&trans->ctx); |
| 3509 | break; |
| 3510 | case NFT_MSG_DELCHAIN: |
| 3511 | nf_tables_chain_destroy(trans->ctx.chain); |
| 3512 | break; |
| 3513 | case NFT_MSG_DELRULE: |
| 3514 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); |
| 3515 | break; |
| 3516 | case NFT_MSG_DELSET: |
| 3517 | nft_set_destroy(nft_trans_set(trans)); |
| 3518 | break; |
| 3519 | } |
| 3520 | kfree(trans); |
| 3521 | } |
| 3522 | |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3523 | static int nf_tables_commit(struct sk_buff *skb) |
| 3524 | { |
| 3525 | struct net *net = sock_net(skb->sk); |
| 3526 | struct nft_trans *trans, *next; |
Pablo Neira Ayuso | a3716e7 | 2014-08-01 19:32:41 +0200 | [diff] [blame] | 3527 | struct nft_trans_elem *te; |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3528 | |
| 3529 | /* Bump generation counter, invalidate any dump in progress */ |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 3530 | while (++net->nft.base_seq == 0); |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3531 | |
| 3532 | /* A new generation has just started */ |
| 3533 | net->nft.gencursor = gencursor_next(net); |
| 3534 | |
| 3535 | /* Make sure all packets have left the previous generation before |
| 3536 | * purging old rules. |
| 3537 | */ |
| 3538 | synchronize_rcu(); |
| 3539 | |
| 3540 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3541 | switch (trans->msg_type) { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3542 | case NFT_MSG_NEWTABLE: |
| 3543 | if (nft_trans_table_update(trans)) { |
| 3544 | if (!nft_trans_table_enable(trans)) { |
| 3545 | nf_tables_table_disable(trans->ctx.afi, |
| 3546 | trans->ctx.table); |
| 3547 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; |
| 3548 | } |
| 3549 | } else { |
| 3550 | trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE; |
| 3551 | } |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3552 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3553 | nft_trans_destroy(trans); |
| 3554 | break; |
| 3555 | case NFT_MSG_DELTABLE: |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3556 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3557 | break; |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3558 | case NFT_MSG_NEWCHAIN: |
| 3559 | if (nft_trans_chain_update(trans)) |
| 3560 | nft_chain_commit_update(trans); |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3561 | else |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3562 | trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE; |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3563 | |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3564 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3565 | nft_trans_destroy(trans); |
| 3566 | break; |
| 3567 | case NFT_MSG_DELCHAIN: |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3568 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
Arturo Borrero | c559879 | 2014-09-02 16:42:23 +0200 | [diff] [blame] | 3569 | nf_tables_unregister_hooks(trans->ctx.table, |
| 3570 | trans->ctx.chain, |
| 3571 | trans->ctx.afi->nops); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3572 | break; |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3573 | case NFT_MSG_NEWRULE: |
| 3574 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3575 | nf_tables_rule_notify(&trans->ctx, |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3576 | nft_trans_rule(trans), |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3577 | NFT_MSG_NEWRULE); |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3578 | nft_trans_destroy(trans); |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3579 | break; |
| 3580 | case NFT_MSG_DELRULE: |
| 3581 | list_del_rcu(&nft_trans_rule(trans)->list); |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3582 | nf_tables_rule_notify(&trans->ctx, |
| 3583 | nft_trans_rule(trans), |
| 3584 | NFT_MSG_DELRULE); |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3585 | break; |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3586 | case NFT_MSG_NEWSET: |
| 3587 | nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE; |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3588 | /* This avoids hitting -EBUSY when deleting the table |
| 3589 | * from the transaction. |
| 3590 | */ |
| 3591 | if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS && |
| 3592 | !list_empty(&nft_trans_set(trans)->bindings)) |
| 3593 | trans->ctx.table->use--; |
| 3594 | |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3595 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 3596 | NFT_MSG_NEWSET, GFP_KERNEL); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3597 | nft_trans_destroy(trans); |
| 3598 | break; |
| 3599 | case NFT_MSG_DELSET: |
| 3600 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 3601 | NFT_MSG_DELSET, GFP_KERNEL); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3602 | break; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3603 | case NFT_MSG_NEWSETELEM: |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3604 | nf_tables_setelem_notify(&trans->ctx, |
| 3605 | nft_trans_elem_set(trans), |
| 3606 | &nft_trans_elem(trans), |
| 3607 | NFT_MSG_NEWSETELEM, 0); |
| 3608 | nft_trans_destroy(trans); |
| 3609 | break; |
| 3610 | case NFT_MSG_DELSETELEM: |
Pablo Neira Ayuso | a3716e7 | 2014-08-01 19:32:41 +0200 | [diff] [blame] | 3611 | te = (struct nft_trans_elem *)trans->data; |
| 3612 | nf_tables_setelem_notify(&trans->ctx, te->set, |
| 3613 | &te->elem, |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3614 | NFT_MSG_DELSETELEM, 0); |
Pablo Neira Ayuso | a3716e7 | 2014-08-01 19:32:41 +0200 | [diff] [blame] | 3615 | te->set->ops->get(te->set, &te->elem); |
| 3616 | te->set->ops->remove(te->set, &te->elem); |
| 3617 | nft_data_uninit(&te->elem.key, NFT_DATA_VALUE); |
| 3618 | if (te->elem.flags & NFT_SET_MAP) { |
| 3619 | nft_data_uninit(&te->elem.data, |
| 3620 | te->set->dtype); |
| 3621 | } |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3622 | nft_trans_destroy(trans); |
| 3623 | break; |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3624 | } |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3625 | } |
| 3626 | |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3627 | synchronize_rcu(); |
| 3628 | |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3629 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
Pablo Neira Ayuso | c7c32e7 | 2014-04-10 00:31:10 +0200 | [diff] [blame] | 3630 | list_del(&trans->list); |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3631 | nf_tables_commit_release(trans); |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3632 | } |
| 3633 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 3634 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); |
| 3635 | |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3636 | return 0; |
| 3637 | } |
| 3638 | |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3639 | static void nf_tables_abort_release(struct nft_trans *trans) |
Pablo Neira Ayuso | c7c32e7 | 2014-04-10 00:31:10 +0200 | [diff] [blame] | 3640 | { |
Pablo Neira Ayuso | c7c32e7 | 2014-04-10 00:31:10 +0200 | [diff] [blame] | 3641 | switch (trans->msg_type) { |
| 3642 | case NFT_MSG_NEWTABLE: |
| 3643 | nf_tables_table_destroy(&trans->ctx); |
| 3644 | break; |
| 3645 | case NFT_MSG_NEWCHAIN: |
| 3646 | nf_tables_chain_destroy(trans->ctx.chain); |
| 3647 | break; |
| 3648 | case NFT_MSG_NEWRULE: |
| 3649 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); |
| 3650 | break; |
| 3651 | case NFT_MSG_NEWSET: |
| 3652 | nft_set_destroy(nft_trans_set(trans)); |
| 3653 | break; |
| 3654 | } |
| 3655 | kfree(trans); |
| 3656 | } |
| 3657 | |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3658 | static int nf_tables_abort(struct sk_buff *skb) |
| 3659 | { |
| 3660 | struct net *net = sock_net(skb->sk); |
| 3661 | struct nft_trans *trans, *next; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3662 | struct nft_set *set; |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3663 | |
| 3664 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3665 | switch (trans->msg_type) { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3666 | case NFT_MSG_NEWTABLE: |
| 3667 | if (nft_trans_table_update(trans)) { |
| 3668 | if (nft_trans_table_enable(trans)) { |
| 3669 | nf_tables_table_disable(trans->ctx.afi, |
| 3670 | trans->ctx.table); |
| 3671 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; |
| 3672 | } |
| 3673 | nft_trans_destroy(trans); |
| 3674 | } else { |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3675 | list_del_rcu(&trans->ctx.table->list); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3676 | } |
| 3677 | break; |
| 3678 | case NFT_MSG_DELTABLE: |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3679 | list_add_tail_rcu(&trans->ctx.table->list, |
| 3680 | &trans->ctx.afi->tables); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3681 | nft_trans_destroy(trans); |
| 3682 | break; |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3683 | case NFT_MSG_NEWCHAIN: |
| 3684 | if (nft_trans_chain_update(trans)) { |
Markus Elfring | 982f405 | 2014-11-18 20:37:05 +0100 | [diff] [blame] | 3685 | free_percpu(nft_trans_chain_stats(trans)); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3686 | |
| 3687 | nft_trans_destroy(trans); |
| 3688 | } else { |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3689 | trans->ctx.table->use--; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3690 | list_del_rcu(&trans->ctx.chain->list); |
Arturo Borrero | c559879 | 2014-09-02 16:42:23 +0200 | [diff] [blame] | 3691 | nf_tables_unregister_hooks(trans->ctx.table, |
| 3692 | trans->ctx.chain, |
| 3693 | trans->ctx.afi->nops); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3694 | } |
| 3695 | break; |
| 3696 | case NFT_MSG_DELCHAIN: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3697 | trans->ctx.table->use++; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3698 | list_add_tail_rcu(&trans->ctx.chain->list, |
| 3699 | &trans->ctx.table->chains); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3700 | nft_trans_destroy(trans); |
| 3701 | break; |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3702 | case NFT_MSG_NEWRULE: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3703 | trans->ctx.chain->use--; |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3704 | list_del_rcu(&nft_trans_rule(trans)->list); |
| 3705 | break; |
| 3706 | case NFT_MSG_DELRULE: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3707 | trans->ctx.chain->use++; |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3708 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3709 | nft_trans_destroy(trans); |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3710 | break; |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3711 | case NFT_MSG_NEWSET: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3712 | trans->ctx.table->use--; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3713 | list_del_rcu(&nft_trans_set(trans)->list); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3714 | break; |
| 3715 | case NFT_MSG_DELSET: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3716 | trans->ctx.table->use++; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3717 | list_add_tail_rcu(&nft_trans_set(trans)->list, |
| 3718 | &trans->ctx.table->sets); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3719 | nft_trans_destroy(trans); |
| 3720 | break; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3721 | case NFT_MSG_NEWSETELEM: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3722 | nft_trans_elem_set(trans)->nelems--; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3723 | set = nft_trans_elem_set(trans); |
| 3724 | set->ops->get(set, &nft_trans_elem(trans)); |
| 3725 | set->ops->remove(set, &nft_trans_elem(trans)); |
| 3726 | nft_trans_destroy(trans); |
| 3727 | break; |
| 3728 | case NFT_MSG_DELSETELEM: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3729 | nft_trans_elem_set(trans)->nelems++; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3730 | nft_trans_destroy(trans); |
| 3731 | break; |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3732 | } |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3733 | } |
| 3734 | |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3735 | synchronize_rcu(); |
| 3736 | |
Pablo Neira Ayuso | a1cee07 | 2014-05-23 11:09:42 +0200 | [diff] [blame] | 3737 | list_for_each_entry_safe_reverse(trans, next, |
| 3738 | &net->nft.commit_list, list) { |
Pablo Neira Ayuso | c7c32e7 | 2014-04-10 00:31:10 +0200 | [diff] [blame] | 3739 | list_del(&trans->list); |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3740 | nf_tables_abort_release(trans); |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3741 | } |
| 3742 | |
| 3743 | return 0; |
| 3744 | } |
| 3745 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3746 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
| 3747 | .name = "nf_tables", |
| 3748 | .subsys_id = NFNL_SUBSYS_NFTABLES, |
| 3749 | .cb_count = NFT_MSG_MAX, |
| 3750 | .cb = nf_tables_cb, |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 3751 | .commit = nf_tables_commit, |
| 3752 | .abort = nf_tables_abort, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3753 | }; |
| 3754 | |
Pablo Neira Ayuso | 7210e4e | 2014-10-13 19:50:22 +0200 | [diff] [blame] | 3755 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
| 3756 | enum nft_chain_type type) |
| 3757 | { |
| 3758 | const struct nft_base_chain *basechain; |
| 3759 | |
| 3760 | if (chain->flags & NFT_BASE_CHAIN) { |
| 3761 | basechain = nft_base_chain(chain); |
| 3762 | if (basechain->type->type != type) |
| 3763 | return -EOPNOTSUPP; |
| 3764 | } |
| 3765 | return 0; |
| 3766 | } |
| 3767 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); |
| 3768 | |
Pablo Neira Ayuso | 75e8d06 | 2015-01-14 15:33:57 +0100 | [diff] [blame] | 3769 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
| 3770 | unsigned int hook_flags) |
| 3771 | { |
| 3772 | struct nft_base_chain *basechain; |
| 3773 | |
| 3774 | if (chain->flags & NFT_BASE_CHAIN) { |
| 3775 | basechain = nft_base_chain(chain); |
| 3776 | |
| 3777 | if ((1 << basechain->ops[0].hooknum) & hook_flags) |
| 3778 | return 0; |
| 3779 | |
| 3780 | return -EOPNOTSUPP; |
| 3781 | } |
| 3782 | |
| 3783 | return 0; |
| 3784 | } |
| 3785 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); |
| 3786 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3787 | /* |
| 3788 | * Loop detection - walk through the ruleset beginning at the destination chain |
| 3789 | * of a new jump until either the source chain is reached (loop) or all |
| 3790 | * reachable chains have been traversed. |
| 3791 | * |
| 3792 | * The loop check is performed whenever a new jump verdict is added to an |
| 3793 | * expression or verdict map or a verdict map is bound to a new chain. |
| 3794 | */ |
| 3795 | |
| 3796 | static int nf_tables_check_loops(const struct nft_ctx *ctx, |
| 3797 | const struct nft_chain *chain); |
| 3798 | |
| 3799 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, |
| 3800 | const struct nft_set *set, |
| 3801 | const struct nft_set_iter *iter, |
| 3802 | const struct nft_set_elem *elem) |
| 3803 | { |
Pablo Neira Ayuso | 62f9c8b | 2014-02-07 14:45:01 +0100 | [diff] [blame] | 3804 | if (elem->flags & NFT_SET_ELEM_INTERVAL_END) |
| 3805 | return 0; |
| 3806 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3807 | switch (elem->data.verdict) { |
| 3808 | case NFT_JUMP: |
| 3809 | case NFT_GOTO: |
| 3810 | return nf_tables_check_loops(ctx, elem->data.chain); |
| 3811 | default: |
| 3812 | return 0; |
| 3813 | } |
| 3814 | } |
| 3815 | |
| 3816 | static int nf_tables_check_loops(const struct nft_ctx *ctx, |
| 3817 | const struct nft_chain *chain) |
| 3818 | { |
| 3819 | const struct nft_rule *rule; |
| 3820 | const struct nft_expr *expr, *last; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3821 | const struct nft_set *set; |
| 3822 | struct nft_set_binding *binding; |
| 3823 | struct nft_set_iter iter; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3824 | |
| 3825 | if (ctx->chain == chain) |
| 3826 | return -ELOOP; |
| 3827 | |
| 3828 | list_for_each_entry(rule, &chain->rules, list) { |
| 3829 | nft_rule_for_each_expr(expr, last, rule) { |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 3830 | const struct nft_data *data = NULL; |
| 3831 | int err; |
| 3832 | |
| 3833 | if (!expr->ops->validate) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3834 | continue; |
| 3835 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 3836 | err = expr->ops->validate(ctx, expr, &data); |
| 3837 | if (err < 0) |
| 3838 | return err; |
| 3839 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3840 | if (data == NULL) |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 3841 | continue; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3842 | |
| 3843 | switch (data->verdict) { |
| 3844 | case NFT_JUMP: |
| 3845 | case NFT_GOTO: |
| 3846 | err = nf_tables_check_loops(ctx, data->chain); |
| 3847 | if (err < 0) |
| 3848 | return err; |
| 3849 | default: |
| 3850 | break; |
| 3851 | } |
| 3852 | } |
| 3853 | } |
| 3854 | |
| 3855 | list_for_each_entry(set, &ctx->table->sets, list) { |
| 3856 | if (!(set->flags & NFT_SET_MAP) || |
| 3857 | set->dtype != NFT_DATA_VERDICT) |
| 3858 | continue; |
| 3859 | |
| 3860 | list_for_each_entry(binding, &set->bindings, list) { |
| 3861 | if (binding->chain != chain) |
| 3862 | continue; |
| 3863 | |
| 3864 | iter.skip = 0; |
| 3865 | iter.count = 0; |
| 3866 | iter.err = 0; |
| 3867 | iter.fn = nf_tables_loop_check_setelem; |
| 3868 | |
| 3869 | set->ops->walk(ctx, set, &iter); |
| 3870 | if (iter.err < 0) |
| 3871 | return iter.err; |
| 3872 | } |
| 3873 | } |
| 3874 | |
| 3875 | return 0; |
| 3876 | } |
| 3877 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3878 | /** |
| 3879 | * nft_validate_input_register - validate an expressions' input register |
| 3880 | * |
| 3881 | * @reg: the register number |
| 3882 | * |
| 3883 | * Validate that the input register is one of the general purpose |
| 3884 | * registers. |
| 3885 | */ |
| 3886 | int nft_validate_input_register(enum nft_registers reg) |
| 3887 | { |
| 3888 | if (reg <= NFT_REG_VERDICT) |
| 3889 | return -EINVAL; |
| 3890 | if (reg > NFT_REG_MAX) |
| 3891 | return -ERANGE; |
| 3892 | return 0; |
| 3893 | } |
| 3894 | EXPORT_SYMBOL_GPL(nft_validate_input_register); |
| 3895 | |
| 3896 | /** |
| 3897 | * nft_validate_output_register - validate an expressions' output register |
| 3898 | * |
| 3899 | * @reg: the register number |
| 3900 | * |
| 3901 | * Validate that the output register is one of the general purpose |
| 3902 | * registers or the verdict register. |
| 3903 | */ |
| 3904 | int nft_validate_output_register(enum nft_registers reg) |
| 3905 | { |
| 3906 | if (reg < NFT_REG_VERDICT) |
| 3907 | return -EINVAL; |
| 3908 | if (reg > NFT_REG_MAX) |
| 3909 | return -ERANGE; |
| 3910 | return 0; |
| 3911 | } |
| 3912 | EXPORT_SYMBOL_GPL(nft_validate_output_register); |
| 3913 | |
| 3914 | /** |
| 3915 | * nft_validate_data_load - validate an expressions' data load |
| 3916 | * |
| 3917 | * @ctx: context of the expression performing the load |
| 3918 | * @reg: the destination register number |
| 3919 | * @data: the data to load |
| 3920 | * @type: the data type |
| 3921 | * |
| 3922 | * Validate that a data load uses the appropriate data type for |
| 3923 | * the destination register. A value of NULL for the data means |
| 3924 | * that its runtime gathered data, which is always of type |
| 3925 | * NFT_DATA_VALUE. |
| 3926 | */ |
| 3927 | int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg, |
| 3928 | const struct nft_data *data, |
| 3929 | enum nft_data_types type) |
| 3930 | { |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3931 | int err; |
| 3932 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3933 | switch (reg) { |
| 3934 | case NFT_REG_VERDICT: |
| 3935 | if (data == NULL || type != NFT_DATA_VERDICT) |
| 3936 | return -EINVAL; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3937 | |
| 3938 | if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) { |
| 3939 | err = nf_tables_check_loops(ctx, data->chain); |
| 3940 | if (err < 0) |
| 3941 | return err; |
| 3942 | |
| 3943 | if (ctx->chain->level + 1 > data->chain->level) { |
| 3944 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
| 3945 | return -EMLINK; |
| 3946 | data->chain->level = ctx->chain->level + 1; |
| 3947 | } |
| 3948 | } |
| 3949 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3950 | return 0; |
| 3951 | default: |
| 3952 | if (data != NULL && type != NFT_DATA_VALUE) |
| 3953 | return -EINVAL; |
| 3954 | return 0; |
| 3955 | } |
| 3956 | } |
| 3957 | EXPORT_SYMBOL_GPL(nft_validate_data_load); |
| 3958 | |
| 3959 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { |
| 3960 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, |
| 3961 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, |
| 3962 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, |
| 3963 | }; |
| 3964 | |
| 3965 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, |
| 3966 | struct nft_data_desc *desc, const struct nlattr *nla) |
| 3967 | { |
| 3968 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
| 3969 | struct nft_chain *chain; |
| 3970 | int err; |
| 3971 | |
| 3972 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); |
| 3973 | if (err < 0) |
| 3974 | return err; |
| 3975 | |
| 3976 | if (!tb[NFTA_VERDICT_CODE]) |
| 3977 | return -EINVAL; |
| 3978 | data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
| 3979 | |
| 3980 | switch (data->verdict) { |
Patrick McHardy | e0abdad | 2014-02-18 18:06:50 +0000 | [diff] [blame] | 3981 | default: |
| 3982 | switch (data->verdict & NF_VERDICT_MASK) { |
| 3983 | case NF_ACCEPT: |
| 3984 | case NF_DROP: |
| 3985 | case NF_QUEUE: |
| 3986 | break; |
| 3987 | default: |
| 3988 | return -EINVAL; |
| 3989 | } |
| 3990 | /* fall through */ |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3991 | case NFT_CONTINUE: |
| 3992 | case NFT_BREAK: |
| 3993 | case NFT_RETURN: |
| 3994 | desc->len = sizeof(data->verdict); |
| 3995 | break; |
| 3996 | case NFT_JUMP: |
| 3997 | case NFT_GOTO: |
| 3998 | if (!tb[NFTA_VERDICT_CHAIN]) |
| 3999 | return -EINVAL; |
| 4000 | chain = nf_tables_chain_lookup(ctx->table, |
| 4001 | tb[NFTA_VERDICT_CHAIN]); |
| 4002 | if (IS_ERR(chain)) |
| 4003 | return PTR_ERR(chain); |
| 4004 | if (chain->flags & NFT_BASE_CHAIN) |
| 4005 | return -EOPNOTSUPP; |
| 4006 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4007 | chain->use++; |
| 4008 | data->chain = chain; |
| 4009 | desc->len = sizeof(data); |
| 4010 | break; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4011 | } |
| 4012 | |
| 4013 | desc->type = NFT_DATA_VERDICT; |
| 4014 | return 0; |
| 4015 | } |
| 4016 | |
| 4017 | static void nft_verdict_uninit(const struct nft_data *data) |
| 4018 | { |
| 4019 | switch (data->verdict) { |
| 4020 | case NFT_JUMP: |
| 4021 | case NFT_GOTO: |
| 4022 | data->chain->use--; |
| 4023 | break; |
| 4024 | } |
| 4025 | } |
| 4026 | |
| 4027 | static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) |
| 4028 | { |
| 4029 | struct nlattr *nest; |
| 4030 | |
| 4031 | nest = nla_nest_start(skb, NFTA_DATA_VERDICT); |
| 4032 | if (!nest) |
| 4033 | goto nla_put_failure; |
| 4034 | |
| 4035 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict))) |
| 4036 | goto nla_put_failure; |
| 4037 | |
| 4038 | switch (data->verdict) { |
| 4039 | case NFT_JUMP: |
| 4040 | case NFT_GOTO: |
| 4041 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name)) |
| 4042 | goto nla_put_failure; |
| 4043 | } |
| 4044 | nla_nest_end(skb, nest); |
| 4045 | return 0; |
| 4046 | |
| 4047 | nla_put_failure: |
| 4048 | return -1; |
| 4049 | } |
| 4050 | |
| 4051 | static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data, |
| 4052 | struct nft_data_desc *desc, const struct nlattr *nla) |
| 4053 | { |
| 4054 | unsigned int len; |
| 4055 | |
| 4056 | len = nla_len(nla); |
| 4057 | if (len == 0) |
| 4058 | return -EINVAL; |
| 4059 | if (len > sizeof(data->data)) |
| 4060 | return -EOVERFLOW; |
| 4061 | |
| 4062 | nla_memcpy(data->data, nla, sizeof(data->data)); |
| 4063 | desc->type = NFT_DATA_VALUE; |
| 4064 | desc->len = len; |
| 4065 | return 0; |
| 4066 | } |
| 4067 | |
| 4068 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, |
| 4069 | unsigned int len) |
| 4070 | { |
| 4071 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); |
| 4072 | } |
| 4073 | |
| 4074 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { |
| 4075 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY, |
| 4076 | .len = FIELD_SIZEOF(struct nft_data, data) }, |
| 4077 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
| 4078 | }; |
| 4079 | |
| 4080 | /** |
| 4081 | * nft_data_init - parse nf_tables data netlink attributes |
| 4082 | * |
| 4083 | * @ctx: context of the expression using the data |
| 4084 | * @data: destination struct nft_data |
| 4085 | * @desc: data description |
| 4086 | * @nla: netlink attribute containing data |
| 4087 | * |
| 4088 | * Parse the netlink data attributes and initialize a struct nft_data. |
| 4089 | * The type and length of data are returned in the data description. |
| 4090 | * |
| 4091 | * The caller can indicate that it only wants to accept data of type |
| 4092 | * NFT_DATA_VALUE by passing NULL for the ctx argument. |
| 4093 | */ |
| 4094 | int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, |
| 4095 | struct nft_data_desc *desc, const struct nlattr *nla) |
| 4096 | { |
| 4097 | struct nlattr *tb[NFTA_DATA_MAX + 1]; |
| 4098 | int err; |
| 4099 | |
| 4100 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); |
| 4101 | if (err < 0) |
| 4102 | return err; |
| 4103 | |
| 4104 | if (tb[NFTA_DATA_VALUE]) |
| 4105 | return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); |
| 4106 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
| 4107 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); |
| 4108 | return -EINVAL; |
| 4109 | } |
| 4110 | EXPORT_SYMBOL_GPL(nft_data_init); |
| 4111 | |
| 4112 | /** |
| 4113 | * nft_data_uninit - release a nft_data item |
| 4114 | * |
| 4115 | * @data: struct nft_data to release |
| 4116 | * @type: type of data |
| 4117 | * |
| 4118 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, |
| 4119 | * all others need to be released by calling this function. |
| 4120 | */ |
| 4121 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) |
| 4122 | { |
| 4123 | switch (type) { |
| 4124 | case NFT_DATA_VALUE: |
| 4125 | return; |
| 4126 | case NFT_DATA_VERDICT: |
| 4127 | return nft_verdict_uninit(data); |
| 4128 | default: |
| 4129 | WARN_ON(1); |
| 4130 | } |
| 4131 | } |
| 4132 | EXPORT_SYMBOL_GPL(nft_data_uninit); |
| 4133 | |
| 4134 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, |
| 4135 | enum nft_data_types type, unsigned int len) |
| 4136 | { |
| 4137 | struct nlattr *nest; |
| 4138 | int err; |
| 4139 | |
| 4140 | nest = nla_nest_start(skb, attr); |
| 4141 | if (nest == NULL) |
| 4142 | return -1; |
| 4143 | |
| 4144 | switch (type) { |
| 4145 | case NFT_DATA_VALUE: |
| 4146 | err = nft_value_dump(skb, data, len); |
| 4147 | break; |
| 4148 | case NFT_DATA_VERDICT: |
| 4149 | err = nft_verdict_dump(skb, data); |
| 4150 | break; |
| 4151 | default: |
| 4152 | err = -EINVAL; |
| 4153 | WARN_ON(1); |
| 4154 | } |
| 4155 | |
| 4156 | nla_nest_end(skb, nest); |
| 4157 | return err; |
| 4158 | } |
| 4159 | EXPORT_SYMBOL_GPL(nft_data_dump); |
| 4160 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 4161 | static int nf_tables_init_net(struct net *net) |
| 4162 | { |
| 4163 | INIT_LIST_HEAD(&net->nft.af_info); |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 4164 | INIT_LIST_HEAD(&net->nft.commit_list); |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 4165 | net->nft.base_seq = 1; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 4166 | return 0; |
| 4167 | } |
| 4168 | |
| 4169 | static struct pernet_operations nf_tables_net_ops = { |
| 4170 | .init = nf_tables_init_net, |
| 4171 | }; |
| 4172 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4173 | static int __init nf_tables_module_init(void) |
| 4174 | { |
| 4175 | int err; |
| 4176 | |
| 4177 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, |
| 4178 | GFP_KERNEL); |
| 4179 | if (info == NULL) { |
| 4180 | err = -ENOMEM; |
| 4181 | goto err1; |
| 4182 | } |
| 4183 | |
| 4184 | err = nf_tables_core_module_init(); |
| 4185 | if (err < 0) |
| 4186 | goto err2; |
| 4187 | |
| 4188 | err = nfnetlink_subsys_register(&nf_tables_subsys); |
| 4189 | if (err < 0) |
| 4190 | goto err3; |
| 4191 | |
| 4192 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 4193 | return register_pernet_subsys(&nf_tables_net_ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4194 | err3: |
| 4195 | nf_tables_core_module_exit(); |
| 4196 | err2: |
| 4197 | kfree(info); |
| 4198 | err1: |
| 4199 | return err; |
| 4200 | } |
| 4201 | |
| 4202 | static void __exit nf_tables_module_exit(void) |
| 4203 | { |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 4204 | unregister_pernet_subsys(&nf_tables_net_ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4205 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
Pablo Neira Ayuso | 1b1bc49 | 2014-10-01 13:53:20 +0200 | [diff] [blame] | 4206 | rcu_barrier(); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4207 | nf_tables_core_module_exit(); |
| 4208 | kfree(info); |
| 4209 | } |
| 4210 | |
| 4211 | module_init(nf_tables_module_init); |
| 4212 | module_exit(nf_tables_module_exit); |
| 4213 | |
| 4214 | MODULE_LICENSE("GPL"); |
| 4215 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 4216 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |