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 | { |
Patrick McHardy | 8670c3a | 2015-03-03 20:04:18 +0000 | [diff] [blame] | 230 | rule->genmask &= ~(1 << gencursor_next(net)); |
Arturo Borrero | ee01d54 | 2014-09-02 16:42:25 +0200 | [diff] [blame] | 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] = { |
| 404 | [NFTA_TABLE_NAME] = { .type = NLA_STRING }, |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 405 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 406 | }; |
| 407 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 408 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
| 409 | u32 portid, u32 seq, int event, u32 flags, |
| 410 | int family, const struct nft_table *table) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 411 | { |
| 412 | struct nlmsghdr *nlh; |
| 413 | struct nfgenmsg *nfmsg; |
| 414 | |
| 415 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 416 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
| 417 | if (nlh == NULL) |
| 418 | goto nla_put_failure; |
| 419 | |
| 420 | nfmsg = nlmsg_data(nlh); |
| 421 | nfmsg->nfgen_family = family; |
| 422 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 423 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 424 | |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 425 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
Tomasz Bursztyka | d8bcc768 | 2013-12-12 15:00:42 +0200 | [diff] [blame] | 426 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
| 427 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 428 | goto nla_put_failure; |
| 429 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 430 | nlmsg_end(skb, nlh); |
| 431 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 432 | |
| 433 | nla_put_failure: |
| 434 | nlmsg_trim(skb, nlh); |
| 435 | return -1; |
| 436 | } |
| 437 | |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 438 | 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] | 439 | { |
| 440 | struct sk_buff *skb; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 441 | int err; |
| 442 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 443 | if (!ctx->report && |
| 444 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 445 | return 0; |
| 446 | |
| 447 | err = -ENOBUFS; |
| 448 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 449 | if (skb == NULL) |
| 450 | goto err; |
| 451 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 452 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
| 453 | event, 0, ctx->afi->family, ctx->table); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 454 | if (err < 0) { |
| 455 | kfree_skb(skb); |
| 456 | goto err; |
| 457 | } |
| 458 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 459 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 460 | ctx->report, GFP_KERNEL); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 461 | err: |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 462 | if (err < 0) { |
| 463 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 464 | err); |
| 465 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 466 | return err; |
| 467 | } |
| 468 | |
| 469 | static int nf_tables_dump_tables(struct sk_buff *skb, |
| 470 | struct netlink_callback *cb) |
| 471 | { |
| 472 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
| 473 | const struct nft_af_info *afi; |
| 474 | const struct nft_table *table; |
| 475 | unsigned int idx = 0, s_idx = cb->args[0]; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 476 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 477 | int family = nfmsg->nfgen_family; |
| 478 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 479 | rcu_read_lock(); |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 480 | cb->seq = net->nft.base_seq; |
| 481 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 482 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 483 | if (family != NFPROTO_UNSPEC && family != afi->family) |
| 484 | continue; |
| 485 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 486 | list_for_each_entry_rcu(table, &afi->tables, list) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 487 | if (idx < s_idx) |
| 488 | goto cont; |
| 489 | if (idx > s_idx) |
| 490 | memset(&cb->args[1], 0, |
| 491 | sizeof(cb->args) - sizeof(cb->args[0])); |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 492 | if (nf_tables_fill_table_info(skb, net, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 493 | NETLINK_CB(cb->skb).portid, |
| 494 | cb->nlh->nlmsg_seq, |
| 495 | NFT_MSG_NEWTABLE, |
| 496 | NLM_F_MULTI, |
| 497 | afi->family, table) < 0) |
| 498 | goto done; |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 499 | |
| 500 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 501 | cont: |
| 502 | idx++; |
| 503 | } |
| 504 | } |
| 505 | done: |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 506 | rcu_read_unlock(); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 507 | cb->args[0] = idx; |
| 508 | return skb->len; |
| 509 | } |
| 510 | |
| 511 | static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb, |
| 512 | const struct nlmsghdr *nlh, |
| 513 | const struct nlattr * const nla[]) |
| 514 | { |
| 515 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 516 | const struct nft_af_info *afi; |
| 517 | const struct nft_table *table; |
| 518 | struct sk_buff *skb2; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 519 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 520 | int family = nfmsg->nfgen_family; |
| 521 | int err; |
| 522 | |
| 523 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 524 | struct netlink_dump_control c = { |
| 525 | .dump = nf_tables_dump_tables, |
| 526 | }; |
| 527 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 528 | } |
| 529 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 530 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 531 | if (IS_ERR(afi)) |
| 532 | return PTR_ERR(afi); |
| 533 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 534 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 535 | if (IS_ERR(table)) |
| 536 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 537 | if (table->flags & NFT_TABLE_INACTIVE) |
| 538 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 539 | |
| 540 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 541 | if (!skb2) |
| 542 | return -ENOMEM; |
| 543 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 544 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 545 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
| 546 | family, table); |
| 547 | if (err < 0) |
| 548 | goto err; |
| 549 | |
| 550 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 551 | |
| 552 | err: |
| 553 | kfree_skb(skb2); |
| 554 | return err; |
| 555 | } |
| 556 | |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 557 | static int nf_tables_table_enable(const struct nft_af_info *afi, |
| 558 | struct nft_table *table) |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 559 | { |
| 560 | struct nft_chain *chain; |
| 561 | int err, i = 0; |
| 562 | |
| 563 | list_for_each_entry(chain, &table->chains, list) { |
Pablo Neira Ayuso | d201297 | 2013-12-27 10:44:23 +0100 | [diff] [blame] | 564 | if (!(chain->flags & NFT_BASE_CHAIN)) |
| 565 | continue; |
| 566 | |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 567 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 568 | if (err < 0) |
| 569 | goto err; |
| 570 | |
| 571 | i++; |
| 572 | } |
| 573 | return 0; |
| 574 | err: |
| 575 | list_for_each_entry(chain, &table->chains, list) { |
Pablo Neira Ayuso | d201297 | 2013-12-27 10:44:23 +0100 | [diff] [blame] | 576 | if (!(chain->flags & NFT_BASE_CHAIN)) |
| 577 | continue; |
| 578 | |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 579 | if (i-- <= 0) |
| 580 | break; |
| 581 | |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 582 | nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 583 | } |
| 584 | return err; |
| 585 | } |
| 586 | |
Pablo Neira Ayuso | f75edf5 | 2014-03-30 14:04:52 +0200 | [diff] [blame] | 587 | static void nf_tables_table_disable(const struct nft_af_info *afi, |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 588 | struct nft_table *table) |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 589 | { |
| 590 | struct nft_chain *chain; |
| 591 | |
Pablo Neira Ayuso | d201297 | 2013-12-27 10:44:23 +0100 | [diff] [blame] | 592 | list_for_each_entry(chain, &table->chains, list) { |
| 593 | if (chain->flags & NFT_BASE_CHAIN) |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 594 | nf_unregister_hooks(nft_base_chain(chain)->ops, |
| 595 | afi->nops); |
Pablo Neira Ayuso | d201297 | 2013-12-27 10:44:23 +0100 | [diff] [blame] | 596 | } |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 597 | } |
| 598 | |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 599 | static int nf_tables_updtable(struct nft_ctx *ctx) |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 600 | { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 601 | struct nft_trans *trans; |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 602 | u32 flags; |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 603 | int ret = 0; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 604 | |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 605 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
| 606 | return 0; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 607 | |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 608 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
| 609 | if (flags & ~NFT_TABLE_F_DORMANT) |
| 610 | return -EINVAL; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 611 | |
Pablo Neira Ayuso | 63283dd | 2014-06-27 18:51:39 +0200 | [diff] [blame] | 612 | if (flags == ctx->table->flags) |
| 613 | return 0; |
| 614 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 615 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
| 616 | sizeof(struct nft_trans_table)); |
| 617 | if (trans == NULL) |
| 618 | return -ENOMEM; |
| 619 | |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 620 | if ((flags & NFT_TABLE_F_DORMANT) && |
| 621 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 622 | nft_trans_table_enable(trans) = false; |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 623 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
| 624 | ctx->table->flags & NFT_TABLE_F_DORMANT) { |
| 625 | ret = nf_tables_table_enable(ctx->afi, ctx->table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 626 | if (ret >= 0) { |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 627 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 628 | nft_trans_table_enable(trans) = true; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 629 | } |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 630 | } |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 631 | if (ret < 0) |
| 632 | goto err; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 633 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 634 | nft_trans_table_update(trans) = true; |
| 635 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
| 636 | return 0; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 637 | err: |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 638 | nft_trans_destroy(trans); |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 639 | return ret; |
| 640 | } |
| 641 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 642 | static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb, |
| 643 | const struct nlmsghdr *nlh, |
| 644 | const struct nlattr * const nla[]) |
| 645 | { |
| 646 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 647 | const struct nlattr *name; |
| 648 | struct nft_af_info *afi; |
| 649 | struct nft_table *table; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 650 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 651 | int family = nfmsg->nfgen_family; |
Patrick McHardy | c5c1f97 | 2014-01-09 18:42:39 +0000 | [diff] [blame] | 652 | u32 flags = 0; |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 653 | struct nft_ctx ctx; |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 654 | int err; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 655 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 656 | afi = nf_tables_afinfo_lookup(net, family, true); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 657 | if (IS_ERR(afi)) |
| 658 | return PTR_ERR(afi); |
| 659 | |
| 660 | name = nla[NFTA_TABLE_NAME]; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 661 | table = nf_tables_table_lookup(afi, name); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 662 | if (IS_ERR(table)) { |
| 663 | if (PTR_ERR(table) != -ENOENT) |
| 664 | return PTR_ERR(table); |
| 665 | table = NULL; |
| 666 | } |
| 667 | |
| 668 | if (table != NULL) { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 669 | if (table->flags & NFT_TABLE_INACTIVE) |
| 670 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 671 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 672 | return -EEXIST; |
| 673 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 674 | return -EOPNOTSUPP; |
Pablo Neira Ayuso | e1aaca9 | 2014-03-30 14:04:53 +0200 | [diff] [blame] | 675 | |
| 676 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
| 677 | return nf_tables_updtable(&ctx); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 678 | } |
| 679 | |
Patrick McHardy | c5c1f97 | 2014-01-09 18:42:39 +0000 | [diff] [blame] | 680 | if (nla[NFTA_TABLE_FLAGS]) { |
| 681 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); |
| 682 | if (flags & ~NFT_TABLE_F_DORMANT) |
| 683 | return -EINVAL; |
| 684 | } |
| 685 | |
Patrick McHardy | 7047f9d | 2014-01-09 18:42:40 +0000 | [diff] [blame] | 686 | if (!try_module_get(afi->owner)) |
| 687 | return -EAFNOSUPPORT; |
| 688 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 689 | table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL); |
Patrick McHardy | 7047f9d | 2014-01-09 18:42:40 +0000 | [diff] [blame] | 690 | if (table == NULL) { |
| 691 | module_put(afi->owner); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 692 | return -ENOMEM; |
Patrick McHardy | 7047f9d | 2014-01-09 18:42:40 +0000 | [diff] [blame] | 693 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 694 | |
| 695 | nla_strlcpy(table->name, name, nla_len(name)); |
| 696 | INIT_LIST_HEAD(&table->chains); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 697 | INIT_LIST_HEAD(&table->sets); |
Patrick McHardy | c5c1f97 | 2014-01-09 18:42:39 +0000 | [diff] [blame] | 698 | table->flags = flags; |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 699 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 700 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
| 701 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
| 702 | if (err < 0) { |
| 703 | kfree(table); |
| 704 | module_put(afi->owner); |
| 705 | return err; |
| 706 | } |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 707 | list_add_tail_rcu(&table->list, &afi->tables); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 708 | return 0; |
| 709 | } |
| 710 | |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 711 | static int nft_flush_table(struct nft_ctx *ctx) |
| 712 | { |
| 713 | int err; |
| 714 | struct nft_chain *chain, *nc; |
| 715 | struct nft_set *set, *ns; |
| 716 | |
Pablo Neira Ayuso | a2f18db | 2015-01-04 15:14:22 +0100 | [diff] [blame] | 717 | list_for_each_entry(chain, &ctx->table->chains, list) { |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 718 | ctx->chain = chain; |
| 719 | |
| 720 | err = nft_delrule_by_chain(ctx); |
| 721 | if (err < 0) |
| 722 | goto out; |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 723 | } |
| 724 | |
| 725 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { |
| 726 | if (set->flags & NFT_SET_ANONYMOUS && |
| 727 | !list_empty(&set->bindings)) |
| 728 | continue; |
| 729 | |
| 730 | err = nft_delset(ctx, set); |
| 731 | if (err < 0) |
| 732 | goto out; |
| 733 | } |
| 734 | |
Pablo Neira Ayuso | a2f18db | 2015-01-04 15:14:22 +0100 | [diff] [blame] | 735 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
| 736 | ctx->chain = chain; |
| 737 | |
| 738 | err = nft_delchain(ctx); |
| 739 | if (err < 0) |
| 740 | goto out; |
| 741 | } |
| 742 | |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 743 | err = nft_deltable(ctx); |
| 744 | out: |
| 745 | return err; |
| 746 | } |
| 747 | |
| 748 | static int nft_flush(struct nft_ctx *ctx, int family) |
| 749 | { |
| 750 | struct nft_af_info *afi; |
| 751 | struct nft_table *table, *nt; |
| 752 | const struct nlattr * const *nla = ctx->nla; |
| 753 | int err = 0; |
| 754 | |
| 755 | list_for_each_entry(afi, &ctx->net->nft.af_info, list) { |
| 756 | if (family != AF_UNSPEC && afi->family != family) |
| 757 | continue; |
| 758 | |
| 759 | ctx->afi = afi; |
| 760 | list_for_each_entry_safe(table, nt, &afi->tables, list) { |
| 761 | if (nla[NFTA_TABLE_NAME] && |
| 762 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) |
| 763 | continue; |
| 764 | |
| 765 | ctx->table = table; |
| 766 | |
| 767 | err = nft_flush_table(ctx); |
| 768 | if (err < 0) |
| 769 | goto out; |
| 770 | } |
| 771 | } |
| 772 | out: |
| 773 | return err; |
| 774 | } |
| 775 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 776 | static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb, |
| 777 | const struct nlmsghdr *nlh, |
| 778 | const struct nlattr * const nla[]) |
| 779 | { |
| 780 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 781 | struct nft_af_info *afi; |
| 782 | struct nft_table *table; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 783 | struct net *net = sock_net(skb->sk); |
Arturo Borrero | ee01d54 | 2014-09-02 16:42:25 +0200 | [diff] [blame] | 784 | int family = nfmsg->nfgen_family; |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 785 | struct nft_ctx ctx; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 786 | |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 787 | nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla); |
| 788 | if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL) |
| 789 | return nft_flush(&ctx, family); |
| 790 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 791 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 792 | if (IS_ERR(afi)) |
| 793 | return PTR_ERR(afi); |
| 794 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 795 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 796 | if (IS_ERR(table)) |
| 797 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 798 | if (table->flags & NFT_TABLE_INACTIVE) |
| 799 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 800 | |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 801 | ctx.afi = afi; |
| 802 | ctx.table = table; |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 803 | |
Arturo Borrero | b9ac12e | 2014-09-02 16:42:26 +0200 | [diff] [blame] | 804 | return nft_flush_table(&ctx); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 805 | } |
| 806 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 807 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
| 808 | { |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 809 | BUG_ON(ctx->table->use > 0); |
| 810 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 811 | kfree(ctx->table); |
| 812 | module_put(ctx->afi->owner); |
| 813 | } |
| 814 | |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 815 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 816 | { |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 817 | int err = 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 818 | |
| 819 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 820 | if (chain_type[ctype->family][ctype->type] != NULL) { |
| 821 | err = -EBUSY; |
| 822 | goto out; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 823 | } |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 824 | chain_type[ctype->family][ctype->type] = ctype; |
| 825 | out: |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 826 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 827 | return err; |
| 828 | } |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 829 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 830 | |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 831 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 832 | { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 833 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 834 | chain_type[ctype->family][ctype->type] = NULL; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 835 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 836 | } |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 837 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 838 | |
| 839 | /* |
| 840 | * Chains |
| 841 | */ |
| 842 | |
| 843 | static struct nft_chain * |
| 844 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) |
| 845 | { |
| 846 | struct nft_chain *chain; |
| 847 | |
| 848 | list_for_each_entry(chain, &table->chains, list) { |
| 849 | if (chain->handle == handle) |
| 850 | return chain; |
| 851 | } |
| 852 | |
| 853 | return ERR_PTR(-ENOENT); |
| 854 | } |
| 855 | |
| 856 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, |
| 857 | const struct nlattr *nla) |
| 858 | { |
| 859 | struct nft_chain *chain; |
| 860 | |
| 861 | if (nla == NULL) |
| 862 | return ERR_PTR(-EINVAL); |
| 863 | |
| 864 | list_for_each_entry(chain, &table->chains, list) { |
| 865 | if (!nla_strcmp(nla, chain->name)) |
| 866 | return chain; |
| 867 | } |
| 868 | |
| 869 | return ERR_PTR(-ENOENT); |
| 870 | } |
| 871 | |
| 872 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { |
| 873 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, |
| 874 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
| 875 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, |
| 876 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, |
| 877 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 878 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
Pablo Neira | 4c1f781 | 2014-03-31 17:43:47 +0200 | [diff] [blame] | 879 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 880 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 881 | }; |
| 882 | |
| 883 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { |
| 884 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, |
| 885 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, |
| 886 | }; |
| 887 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 888 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
| 889 | { |
| 890 | struct nft_stats *cpu_stats, total; |
| 891 | struct nlattr *nest; |
Eric Dumazet | ce355e2 | 2014-07-09 15:14:06 +0200 | [diff] [blame] | 892 | unsigned int seq; |
| 893 | u64 pkts, bytes; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 894 | int cpu; |
| 895 | |
| 896 | memset(&total, 0, sizeof(total)); |
| 897 | for_each_possible_cpu(cpu) { |
| 898 | cpu_stats = per_cpu_ptr(stats, cpu); |
Eric Dumazet | ce355e2 | 2014-07-09 15:14:06 +0200 | [diff] [blame] | 899 | do { |
| 900 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); |
| 901 | pkts = cpu_stats->pkts; |
| 902 | bytes = cpu_stats->bytes; |
| 903 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); |
| 904 | total.pkts += pkts; |
| 905 | total.bytes += bytes; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 906 | } |
| 907 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); |
| 908 | if (nest == NULL) |
| 909 | goto nla_put_failure; |
| 910 | |
| 911 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) || |
| 912 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes))) |
| 913 | goto nla_put_failure; |
| 914 | |
| 915 | nla_nest_end(skb, nest); |
| 916 | return 0; |
| 917 | |
| 918 | nla_put_failure: |
| 919 | return -ENOSPC; |
| 920 | } |
| 921 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 922 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
| 923 | u32 portid, u32 seq, int event, u32 flags, |
| 924 | int family, const struct nft_table *table, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 925 | const struct nft_chain *chain) |
| 926 | { |
| 927 | struct nlmsghdr *nlh; |
| 928 | struct nfgenmsg *nfmsg; |
| 929 | |
| 930 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 931 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
| 932 | if (nlh == NULL) |
| 933 | goto nla_put_failure; |
| 934 | |
| 935 | nfmsg = nlmsg_data(nlh); |
| 936 | nfmsg->nfgen_family = family; |
| 937 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 938 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 939 | |
| 940 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) |
| 941 | goto nla_put_failure; |
| 942 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle))) |
| 943 | goto nla_put_failure; |
| 944 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) |
| 945 | goto nla_put_failure; |
| 946 | |
| 947 | if (chain->flags & NFT_BASE_CHAIN) { |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 948 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 949 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 950 | struct nlattr *nest; |
| 951 | |
| 952 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 953 | if (nest == NULL) |
| 954 | goto nla_put_failure; |
| 955 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) |
| 956 | goto nla_put_failure; |
| 957 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) |
| 958 | goto nla_put_failure; |
| 959 | nla_nest_end(skb, nest); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 960 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 961 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
| 962 | htonl(basechain->policy))) |
| 963 | goto nla_put_failure; |
| 964 | |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 965 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
| 966 | goto nla_put_failure; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 967 | |
| 968 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) |
| 969 | goto nla_put_failure; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 970 | } |
| 971 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 972 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
| 973 | goto nla_put_failure; |
| 974 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 975 | nlmsg_end(skb, nlh); |
| 976 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 977 | |
| 978 | nla_put_failure: |
| 979 | nlmsg_trim(skb, nlh); |
| 980 | return -1; |
| 981 | } |
| 982 | |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 983 | 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] | 984 | { |
| 985 | struct sk_buff *skb; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 986 | int err; |
| 987 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 988 | if (!ctx->report && |
| 989 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 990 | return 0; |
| 991 | |
| 992 | err = -ENOBUFS; |
| 993 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 994 | if (skb == NULL) |
| 995 | goto err; |
| 996 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 997 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
| 998 | event, 0, ctx->afi->family, ctx->table, |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 999 | ctx->chain); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1000 | if (err < 0) { |
| 1001 | kfree_skb(skb); |
| 1002 | goto err; |
| 1003 | } |
| 1004 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 1005 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1006 | ctx->report, GFP_KERNEL); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1007 | err: |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 1008 | if (err < 0) { |
| 1009 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1010 | err); |
| 1011 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1012 | return err; |
| 1013 | } |
| 1014 | |
| 1015 | static int nf_tables_dump_chains(struct sk_buff *skb, |
| 1016 | struct netlink_callback *cb) |
| 1017 | { |
| 1018 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
| 1019 | const struct nft_af_info *afi; |
| 1020 | const struct nft_table *table; |
| 1021 | const struct nft_chain *chain; |
| 1022 | unsigned int idx = 0, s_idx = cb->args[0]; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1023 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1024 | int family = nfmsg->nfgen_family; |
| 1025 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1026 | rcu_read_lock(); |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 1027 | cb->seq = net->nft.base_seq; |
| 1028 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1029 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1030 | if (family != NFPROTO_UNSPEC && family != afi->family) |
| 1031 | continue; |
| 1032 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1033 | list_for_each_entry_rcu(table, &afi->tables, list) { |
| 1034 | list_for_each_entry_rcu(chain, &table->chains, list) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1035 | if (idx < s_idx) |
| 1036 | goto cont; |
| 1037 | if (idx > s_idx) |
| 1038 | memset(&cb->args[1], 0, |
| 1039 | sizeof(cb->args) - sizeof(cb->args[0])); |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1040 | if (nf_tables_fill_chain_info(skb, net, |
| 1041 | NETLINK_CB(cb->skb).portid, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1042 | cb->nlh->nlmsg_seq, |
| 1043 | NFT_MSG_NEWCHAIN, |
| 1044 | NLM_F_MULTI, |
| 1045 | afi->family, table, chain) < 0) |
| 1046 | goto done; |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 1047 | |
| 1048 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1049 | cont: |
| 1050 | idx++; |
| 1051 | } |
| 1052 | } |
| 1053 | } |
| 1054 | done: |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1055 | rcu_read_unlock(); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1056 | cb->args[0] = idx; |
| 1057 | return skb->len; |
| 1058 | } |
| 1059 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1060 | static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb, |
| 1061 | const struct nlmsghdr *nlh, |
| 1062 | const struct nlattr * const nla[]) |
| 1063 | { |
| 1064 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 1065 | const struct nft_af_info *afi; |
| 1066 | const struct nft_table *table; |
| 1067 | const struct nft_chain *chain; |
| 1068 | struct sk_buff *skb2; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1069 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1070 | int family = nfmsg->nfgen_family; |
| 1071 | int err; |
| 1072 | |
| 1073 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 1074 | struct netlink_dump_control c = { |
| 1075 | .dump = nf_tables_dump_chains, |
| 1076 | }; |
| 1077 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 1078 | } |
| 1079 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1080 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1081 | if (IS_ERR(afi)) |
| 1082 | return PTR_ERR(afi); |
| 1083 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1084 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1085 | if (IS_ERR(table)) |
| 1086 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 1087 | if (table->flags & NFT_TABLE_INACTIVE) |
| 1088 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1089 | |
| 1090 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); |
| 1091 | if (IS_ERR(chain)) |
| 1092 | return PTR_ERR(chain); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1093 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1094 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1095 | |
| 1096 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1097 | if (!skb2) |
| 1098 | return -ENOMEM; |
| 1099 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1100 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1101 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
| 1102 | family, table, chain); |
| 1103 | if (err < 0) |
| 1104 | goto err; |
| 1105 | |
| 1106 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 1107 | |
| 1108 | err: |
| 1109 | kfree_skb(skb2); |
| 1110 | return err; |
| 1111 | } |
| 1112 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1113 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
| 1114 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, |
| 1115 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, |
| 1116 | }; |
| 1117 | |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1118 | 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] | 1119 | { |
| 1120 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; |
| 1121 | struct nft_stats __percpu *newstats; |
| 1122 | struct nft_stats *stats; |
| 1123 | int err; |
| 1124 | |
| 1125 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); |
| 1126 | if (err < 0) |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1127 | return ERR_PTR(err); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1128 | |
| 1129 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1130 | return ERR_PTR(-EINVAL); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1131 | |
Eric Dumazet | ce355e2 | 2014-07-09 15:14:06 +0200 | [diff] [blame] | 1132 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1133 | if (newstats == NULL) |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1134 | return ERR_PTR(-ENOMEM); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1135 | |
| 1136 | /* Restore old counters on this cpu, no problem. Per-cpu statistics |
| 1137 | * are not exposed to userspace. |
| 1138 | */ |
Pablo Neira Ayuso | e8781f7 | 2015-01-21 18:04:18 +0100 | [diff] [blame] | 1139 | preempt_disable(); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1140 | stats = this_cpu_ptr(newstats); |
| 1141 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); |
| 1142 | 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] | 1143 | preempt_enable(); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1144 | |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1145 | return newstats; |
| 1146 | } |
| 1147 | |
| 1148 | static void nft_chain_stats_replace(struct nft_base_chain *chain, |
| 1149 | struct nft_stats __percpu *newstats) |
| 1150 | { |
Pablo Neira Ayuso | b88825d | 2014-08-05 17:25:59 +0200 | [diff] [blame] | 1151 | if (newstats == NULL) |
| 1152 | return; |
| 1153 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1154 | if (chain->stats) { |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1155 | struct nft_stats __percpu *oldstats = |
Patrick McHardy | 67a8fc2 | 2014-02-18 18:06:49 +0000 | [diff] [blame] | 1156 | nft_dereference(chain->stats); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1157 | |
| 1158 | rcu_assign_pointer(chain->stats, newstats); |
| 1159 | synchronize_rcu(); |
| 1160 | free_percpu(oldstats); |
| 1161 | } else |
| 1162 | rcu_assign_pointer(chain->stats, newstats); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1163 | } |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1164 | |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1165 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
| 1166 | { |
| 1167 | BUG_ON(chain->use > 0); |
| 1168 | |
| 1169 | if (chain->flags & NFT_BASE_CHAIN) { |
| 1170 | module_put(nft_base_chain(chain)->type->owner); |
| 1171 | free_percpu(nft_base_chain(chain)->stats); |
| 1172 | kfree(nft_base_chain(chain)); |
| 1173 | } else { |
| 1174 | kfree(chain); |
| 1175 | } |
| 1176 | } |
| 1177 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1178 | static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb, |
| 1179 | const struct nlmsghdr *nlh, |
| 1180 | const struct nlattr * const nla[]) |
| 1181 | { |
| 1182 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 1183 | const struct nlattr * uninitialized_var(name); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 1184 | struct nft_af_info *afi; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1185 | struct nft_table *table; |
| 1186 | struct nft_chain *chain; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1187 | struct nft_base_chain *basechain = NULL; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1188 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1189 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1190 | int family = nfmsg->nfgen_family; |
Patrick McHardy | 57de2a0 | 2014-01-09 18:42:31 +0000 | [diff] [blame] | 1191 | u8 policy = NF_ACCEPT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1192 | u64 handle = 0; |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 1193 | unsigned int i; |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1194 | struct nft_stats __percpu *stats; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1195 | int err; |
| 1196 | bool create; |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1197 | struct nft_ctx ctx; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1198 | |
| 1199 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| 1200 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1201 | afi = nf_tables_afinfo_lookup(net, family, true); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1202 | if (IS_ERR(afi)) |
| 1203 | return PTR_ERR(afi); |
| 1204 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1205 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1206 | if (IS_ERR(table)) |
| 1207 | return PTR_ERR(table); |
| 1208 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1209 | chain = NULL; |
| 1210 | name = nla[NFTA_CHAIN_NAME]; |
| 1211 | |
| 1212 | if (nla[NFTA_CHAIN_HANDLE]) { |
| 1213 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); |
| 1214 | chain = nf_tables_chain_lookup_byhandle(table, handle); |
| 1215 | if (IS_ERR(chain)) |
| 1216 | return PTR_ERR(chain); |
| 1217 | } else { |
| 1218 | chain = nf_tables_chain_lookup(table, name); |
| 1219 | if (IS_ERR(chain)) { |
| 1220 | if (PTR_ERR(chain) != -ENOENT) |
| 1221 | return PTR_ERR(chain); |
| 1222 | chain = NULL; |
| 1223 | } |
| 1224 | } |
| 1225 | |
Patrick McHardy | 57de2a0 | 2014-01-09 18:42:31 +0000 | [diff] [blame] | 1226 | if (nla[NFTA_CHAIN_POLICY]) { |
| 1227 | if ((chain != NULL && |
| 1228 | !(chain->flags & NFT_BASE_CHAIN)) || |
| 1229 | nla[NFTA_CHAIN_HOOK] == NULL) |
| 1230 | return -EOPNOTSUPP; |
| 1231 | |
Pablo Neira Ayuso | 8f46df1 | 2014-01-10 15:11:25 +0100 | [diff] [blame] | 1232 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
Patrick McHardy | 57de2a0 | 2014-01-09 18:42:31 +0000 | [diff] [blame] | 1233 | switch (policy) { |
| 1234 | case NF_DROP: |
| 1235 | case NF_ACCEPT: |
| 1236 | break; |
| 1237 | default: |
| 1238 | return -EINVAL; |
| 1239 | } |
| 1240 | } |
| 1241 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1242 | if (chain != NULL) { |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1243 | struct nft_stats *stats = NULL; |
| 1244 | struct nft_trans *trans; |
| 1245 | |
| 1246 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1247 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1248 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 1249 | return -EEXIST; |
| 1250 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 1251 | return -EOPNOTSUPP; |
| 1252 | |
| 1253 | if (nla[NFTA_CHAIN_HANDLE] && name && |
| 1254 | !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) |
| 1255 | return -EEXIST; |
| 1256 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1257 | if (nla[NFTA_CHAIN_COUNTERS]) { |
| 1258 | if (!(chain->flags & NFT_BASE_CHAIN)) |
| 1259 | return -EOPNOTSUPP; |
| 1260 | |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1261 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
| 1262 | if (IS_ERR(stats)) |
| 1263 | return PTR_ERR(stats); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1264 | } |
| 1265 | |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1266 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
| 1267 | trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN, |
| 1268 | sizeof(struct nft_trans_chain)); |
Pablo Neira Ayuso | f5553c1 | 2015-01-29 19:08:09 +0100 | [diff] [blame] | 1269 | if (trans == NULL) { |
| 1270 | free_percpu(stats); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1271 | return -ENOMEM; |
Pablo Neira Ayuso | f5553c1 | 2015-01-29 19:08:09 +0100 | [diff] [blame] | 1272 | } |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1273 | |
| 1274 | nft_trans_chain_stats(trans) = stats; |
| 1275 | nft_trans_chain_update(trans) = true; |
| 1276 | |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1277 | if (nla[NFTA_CHAIN_POLICY]) |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1278 | nft_trans_chain_policy(trans) = policy; |
| 1279 | else |
| 1280 | nft_trans_chain_policy(trans) = -1; |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1281 | |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1282 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
| 1283 | nla_strlcpy(nft_trans_chain_name(trans), name, |
| 1284 | NFT_CHAIN_MAXNAMELEN); |
| 1285 | } |
| 1286 | list_add_tail(&trans->list, &net->nft.commit_list); |
| 1287 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1288 | } |
| 1289 | |
Patrick McHardy | 7582067 | 2014-01-09 18:42:33 +0000 | [diff] [blame] | 1290 | if (table->use == UINT_MAX) |
| 1291 | return -EOVERFLOW; |
| 1292 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1293 | if (nla[NFTA_CHAIN_HOOK]) { |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 1294 | const struct nf_chain_type *type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1295 | struct nf_hook_ops *ops; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1296 | nf_hookfn *hookfn; |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 1297 | u32 hooknum, priority; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1298 | |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 1299 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1300 | if (nla[NFTA_CHAIN_TYPE]) { |
| 1301 | type = nf_tables_chain_type_lookup(afi, |
| 1302 | nla[NFTA_CHAIN_TYPE], |
| 1303 | create); |
Patrick McHardy | 93b0806 | 2014-01-09 18:42:36 +0000 | [diff] [blame] | 1304 | if (IS_ERR(type)) |
| 1305 | return PTR_ERR(type); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1306 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1307 | |
| 1308 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], |
| 1309 | nft_hook_policy); |
| 1310 | if (err < 0) |
| 1311 | return err; |
| 1312 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || |
| 1313 | ha[NFTA_HOOK_PRIORITY] == NULL) |
| 1314 | return -EINVAL; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1315 | |
| 1316 | hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); |
| 1317 | if (hooknum >= afi->nhooks) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1318 | return -EINVAL; |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 1319 | priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1320 | |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 1321 | if (!(type->hook_mask & (1 << hooknum))) |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1322 | return -EOPNOTSUPP; |
Patrick McHardy | fa2c1de | 2014-01-09 18:42:38 +0000 | [diff] [blame] | 1323 | if (!try_module_get(type->owner)) |
Patrick McHardy | baae3e6 | 2014-01-09 18:42:34 +0000 | [diff] [blame] | 1324 | return -ENOENT; |
Patrick McHardy | fa2c1de | 2014-01-09 18:42:38 +0000 | [diff] [blame] | 1325 | hookfn = type->hooks[hooknum]; |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1326 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1327 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
Pablo Neira Ayuso | f5553c1 | 2015-01-29 19:08:09 +0100 | [diff] [blame] | 1328 | if (basechain == NULL) { |
| 1329 | module_put(type->owner); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1330 | return -ENOMEM; |
Pablo Neira Ayuso | f5553c1 | 2015-01-29 19:08:09 +0100 | [diff] [blame] | 1331 | } |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1332 | |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1333 | if (nla[NFTA_CHAIN_COUNTERS]) { |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1334 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
| 1335 | if (IS_ERR(stats)) { |
Patrick McHardy | fa2c1de | 2014-01-09 18:42:38 +0000 | [diff] [blame] | 1336 | module_put(type->owner); |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1337 | kfree(basechain); |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1338 | return PTR_ERR(stats); |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1339 | } |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1340 | basechain->stats = stats; |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1341 | } else { |
Eric Dumazet | ce355e2 | 2014-07-09 15:14:06 +0200 | [diff] [blame] | 1342 | stats = netdev_alloc_pcpu_stats(struct nft_stats); |
Sabrina Dubroca | c123bb7 | 2014-10-21 11:08:21 +0200 | [diff] [blame] | 1343 | if (stats == NULL) { |
Patrick McHardy | fa2c1de | 2014-01-09 18:42:38 +0000 | [diff] [blame] | 1344 | module_put(type->owner); |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1345 | kfree(basechain); |
Sabrina Dubroca | c123bb7 | 2014-10-21 11:08:21 +0200 | [diff] [blame] | 1346 | return -ENOMEM; |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1347 | } |
Pablo Neira Ayuso | ff3cd7b | 2014-04-09 11:53:06 +0200 | [diff] [blame] | 1348 | rcu_assign_pointer(basechain->stats, stats); |
Patrick McHardy | 4401a86 | 2014-01-09 18:42:32 +0000 | [diff] [blame] | 1349 | } |
| 1350 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1351 | basechain->type = type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1352 | chain = &basechain->chain; |
| 1353 | |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 1354 | for (i = 0; i < afi->nops; i++) { |
| 1355 | ops = &basechain->ops[i]; |
| 1356 | ops->pf = family; |
| 1357 | ops->owner = afi->owner; |
| 1358 | ops->hooknum = hooknum; |
| 1359 | ops->priority = priority; |
| 1360 | ops->priv = chain; |
| 1361 | ops->hook = afi->hooks[ops->hooknum]; |
| 1362 | if (hookfn) |
| 1363 | ops->hook = hookfn; |
| 1364 | if (afi->hook_ops_init) |
| 1365 | afi->hook_ops_init(ops, i); |
| 1366 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1367 | |
| 1368 | chain->flags |= NFT_BASE_CHAIN; |
Patrick McHardy | 57de2a0 | 2014-01-09 18:42:31 +0000 | [diff] [blame] | 1369 | basechain->policy = policy; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1370 | } else { |
| 1371 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); |
| 1372 | if (chain == NULL) |
| 1373 | return -ENOMEM; |
| 1374 | } |
| 1375 | |
| 1376 | INIT_LIST_HEAD(&chain->rules); |
| 1377 | chain->handle = nf_tables_alloc_handle(table); |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 1378 | chain->net = net; |
Pablo Neira Ayuso | b5bc89b | 2013-10-10 16:49:19 +0200 | [diff] [blame] | 1379 | chain->table = table; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1380 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
| 1381 | |
Pablo Neira Ayuso | 9ddf632 | 2013-10-10 13:26:33 +0200 | [diff] [blame] | 1382 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
| 1383 | chain->flags & NFT_BASE_CHAIN) { |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 1384 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1385 | if (err < 0) |
| 1386 | goto err1; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1387 | } |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1388 | |
| 1389 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
| 1390 | err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN); |
| 1391 | if (err < 0) |
| 1392 | goto err2; |
| 1393 | |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 1394 | table->use++; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1395 | list_add_tail_rcu(&chain->list, &table->chains); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1396 | return 0; |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1397 | err2: |
Arturo Borrero | c559879 | 2014-09-02 16:42:23 +0200 | [diff] [blame] | 1398 | nf_tables_unregister_hooks(table, chain, afi->nops); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1399 | err1: |
| 1400 | nf_tables_chain_destroy(chain); |
| 1401 | return err; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1402 | } |
| 1403 | |
| 1404 | static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb, |
| 1405 | const struct nlmsghdr *nlh, |
| 1406 | const struct nlattr * const nla[]) |
| 1407 | { |
| 1408 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 1409 | struct nft_af_info *afi; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1410 | struct nft_table *table; |
| 1411 | struct nft_chain *chain; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1412 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1413 | int family = nfmsg->nfgen_family; |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1414 | struct nft_ctx ctx; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1415 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1416 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1417 | if (IS_ERR(afi)) |
| 1418 | return PTR_ERR(afi); |
| 1419 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1420 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1421 | if (IS_ERR(table)) |
| 1422 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 1423 | if (table->flags & NFT_TABLE_INACTIVE) |
| 1424 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1425 | |
| 1426 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); |
| 1427 | if (IS_ERR(chain)) |
| 1428 | return PTR_ERR(chain); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1429 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1430 | return -ENOENT; |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 1431 | if (chain->use > 0) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1432 | return -EBUSY; |
| 1433 | |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1434 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1435 | |
Arturo Borrero | ee01d54 | 2014-09-02 16:42:25 +0200 | [diff] [blame] | 1436 | return nft_delchain(&ctx); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1437 | } |
| 1438 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1439 | /* |
| 1440 | * Expressions |
| 1441 | */ |
| 1442 | |
| 1443 | /** |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1444 | * nft_register_expr - register nf_tables expr type |
| 1445 | * @ops: expr type |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1446 | * |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1447 | * Registers the expr type for use with nf_tables. Returns zero on |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1448 | * success or a negative errno code otherwise. |
| 1449 | */ |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1450 | int nft_register_expr(struct nft_expr_type *type) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1451 | { |
| 1452 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Tomasz Bursztyka | 758dbce | 2014-04-14 15:41:26 +0300 | [diff] [blame] | 1453 | if (type->family == NFPROTO_UNSPEC) |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1454 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
Tomasz Bursztyka | 758dbce | 2014-04-14 15:41:26 +0300 | [diff] [blame] | 1455 | else |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1456 | list_add_rcu(&type->list, &nf_tables_expressions); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1457 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 1458 | return 0; |
| 1459 | } |
| 1460 | EXPORT_SYMBOL_GPL(nft_register_expr); |
| 1461 | |
| 1462 | /** |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1463 | * nft_unregister_expr - unregister nf_tables expr type |
| 1464 | * @ops: expr type |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1465 | * |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1466 | * Unregisters the expr typefor use with nf_tables. |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1467 | */ |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1468 | void nft_unregister_expr(struct nft_expr_type *type) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1469 | { |
| 1470 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1471 | list_del_rcu(&type->list); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1472 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 1473 | } |
| 1474 | EXPORT_SYMBOL_GPL(nft_unregister_expr); |
| 1475 | |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1476 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
| 1477 | struct nlattr *nla) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1478 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1479 | const struct nft_expr_type *type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1480 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1481 | list_for_each_entry(type, &nf_tables_expressions, list) { |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1482 | if (!nla_strcmp(nla, type->name) && |
| 1483 | (!type->family || type->family == family)) |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1484 | return type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1485 | } |
| 1486 | return NULL; |
| 1487 | } |
| 1488 | |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1489 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
| 1490 | struct nlattr *nla) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1491 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1492 | const struct nft_expr_type *type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1493 | |
| 1494 | if (nla == NULL) |
| 1495 | return ERR_PTR(-EINVAL); |
| 1496 | |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1497 | type = __nft_expr_type_get(family, nla); |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1498 | if (type != NULL && try_module_get(type->owner)) |
| 1499 | return type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1500 | |
| 1501 | #ifdef CONFIG_MODULES |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1502 | if (type == NULL) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1503 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1504 | request_module("nft-expr-%u-%.*s", family, |
| 1505 | nla_len(nla), (char *)nla_data(nla)); |
| 1506 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 1507 | if (__nft_expr_type_get(family, nla)) |
| 1508 | return ERR_PTR(-EAGAIN); |
| 1509 | |
| 1510 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1511 | request_module("nft-expr-%.*s", |
| 1512 | nla_len(nla), (char *)nla_data(nla)); |
| 1513 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1514 | if (__nft_expr_type_get(family, nla)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1515 | return ERR_PTR(-EAGAIN); |
| 1516 | } |
| 1517 | #endif |
| 1518 | return ERR_PTR(-ENOENT); |
| 1519 | } |
| 1520 | |
| 1521 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { |
| 1522 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, |
| 1523 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, |
| 1524 | }; |
| 1525 | |
| 1526 | static int nf_tables_fill_expr_info(struct sk_buff *skb, |
| 1527 | const struct nft_expr *expr) |
| 1528 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1529 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1530 | goto nla_put_failure; |
| 1531 | |
| 1532 | if (expr->ops->dump) { |
| 1533 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); |
| 1534 | if (data == NULL) |
| 1535 | goto nla_put_failure; |
| 1536 | if (expr->ops->dump(skb, expr) < 0) |
| 1537 | goto nla_put_failure; |
| 1538 | nla_nest_end(skb, data); |
| 1539 | } |
| 1540 | |
| 1541 | return skb->len; |
| 1542 | |
| 1543 | nla_put_failure: |
| 1544 | return -1; |
| 1545 | }; |
| 1546 | |
| 1547 | struct nft_expr_info { |
| 1548 | const struct nft_expr_ops *ops; |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1549 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1550 | }; |
| 1551 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1552 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
| 1553 | const struct nlattr *nla, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1554 | struct nft_expr_info *info) |
| 1555 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1556 | const struct nft_expr_type *type; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1557 | const struct nft_expr_ops *ops; |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1558 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1559 | int err; |
| 1560 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1561 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1562 | if (err < 0) |
| 1563 | return err; |
| 1564 | |
Patrick McHardy | 64d4680 | 2014-02-05 15:03:37 +0000 | [diff] [blame] | 1565 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1566 | if (IS_ERR(type)) |
| 1567 | return PTR_ERR(type); |
| 1568 | |
| 1569 | if (tb[NFTA_EXPR_DATA]) { |
| 1570 | err = nla_parse_nested(info->tb, type->maxattr, |
| 1571 | tb[NFTA_EXPR_DATA], type->policy); |
| 1572 | if (err < 0) |
| 1573 | goto err1; |
| 1574 | } else |
| 1575 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); |
| 1576 | |
| 1577 | if (type->select_ops != NULL) { |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1578 | ops = type->select_ops(ctx, |
| 1579 | (const struct nlattr * const *)info->tb); |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1580 | if (IS_ERR(ops)) { |
| 1581 | err = PTR_ERR(ops); |
| 1582 | goto err1; |
| 1583 | } |
| 1584 | } else |
| 1585 | ops = type->ops; |
| 1586 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1587 | info->ops = ops; |
| 1588 | return 0; |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1589 | |
| 1590 | err1: |
| 1591 | module_put(type->owner); |
| 1592 | return err; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1593 | } |
| 1594 | |
| 1595 | static int nf_tables_newexpr(const struct nft_ctx *ctx, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1596 | const struct nft_expr_info *info, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1597 | struct nft_expr *expr) |
| 1598 | { |
| 1599 | const struct nft_expr_ops *ops = info->ops; |
| 1600 | int err; |
| 1601 | |
| 1602 | expr->ops = ops; |
| 1603 | if (ops->init) { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1604 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1605 | if (err < 0) |
| 1606 | goto err1; |
| 1607 | } |
| 1608 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1609 | return 0; |
| 1610 | |
| 1611 | err1: |
| 1612 | expr->ops = NULL; |
| 1613 | return err; |
| 1614 | } |
| 1615 | |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 1616 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
| 1617 | struct nft_expr *expr) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1618 | { |
| 1619 | if (expr->ops->destroy) |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 1620 | expr->ops->destroy(ctx, expr); |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1621 | module_put(expr->ops->type->owner); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1622 | } |
| 1623 | |
| 1624 | /* |
| 1625 | * Rules |
| 1626 | */ |
| 1627 | |
| 1628 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, |
| 1629 | u64 handle) |
| 1630 | { |
| 1631 | struct nft_rule *rule; |
| 1632 | |
| 1633 | // FIXME: this sucks |
| 1634 | list_for_each_entry(rule, &chain->rules, list) { |
| 1635 | if (handle == rule->handle) |
| 1636 | return rule; |
| 1637 | } |
| 1638 | |
| 1639 | return ERR_PTR(-ENOENT); |
| 1640 | } |
| 1641 | |
| 1642 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, |
| 1643 | const struct nlattr *nla) |
| 1644 | { |
| 1645 | if (nla == NULL) |
| 1646 | return ERR_PTR(-EINVAL); |
| 1647 | |
| 1648 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); |
| 1649 | } |
| 1650 | |
| 1651 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { |
| 1652 | [NFTA_RULE_TABLE] = { .type = NLA_STRING }, |
| 1653 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
| 1654 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, |
| 1655 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, |
| 1656 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1657 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1658 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
Pablo Neira Ayuso | 0768b3b | 2014-02-19 17:27:06 +0100 | [diff] [blame] | 1659 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
| 1660 | .len = NFT_USERDATA_MAXLEN }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1661 | }; |
| 1662 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1663 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
| 1664 | u32 portid, u32 seq, int event, |
| 1665 | u32 flags, int family, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1666 | const struct nft_table *table, |
| 1667 | const struct nft_chain *chain, |
| 1668 | const struct nft_rule *rule) |
| 1669 | { |
| 1670 | struct nlmsghdr *nlh; |
| 1671 | struct nfgenmsg *nfmsg; |
| 1672 | const struct nft_expr *expr, *next; |
| 1673 | struct nlattr *list; |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1674 | const struct nft_rule *prule; |
| 1675 | int type = event | NFNL_SUBSYS_NFTABLES << 8; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1676 | |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1677 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1678 | flags); |
| 1679 | if (nlh == NULL) |
| 1680 | goto nla_put_failure; |
| 1681 | |
| 1682 | nfmsg = nlmsg_data(nlh); |
| 1683 | nfmsg->nfgen_family = family; |
| 1684 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1685 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1686 | |
| 1687 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) |
| 1688 | goto nla_put_failure; |
| 1689 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) |
| 1690 | goto nla_put_failure; |
| 1691 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle))) |
| 1692 | goto nla_put_failure; |
| 1693 | |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1694 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
| 1695 | prule = list_entry(rule->list.prev, struct nft_rule, list); |
| 1696 | if (nla_put_be64(skb, NFTA_RULE_POSITION, |
| 1697 | cpu_to_be64(prule->handle))) |
| 1698 | goto nla_put_failure; |
| 1699 | } |
| 1700 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1701 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
| 1702 | if (list == NULL) |
| 1703 | goto nla_put_failure; |
| 1704 | nft_rule_for_each_expr(expr, next, rule) { |
| 1705 | struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM); |
| 1706 | if (elem == NULL) |
| 1707 | goto nla_put_failure; |
| 1708 | if (nf_tables_fill_expr_info(skb, expr) < 0) |
| 1709 | goto nla_put_failure; |
| 1710 | nla_nest_end(skb, elem); |
| 1711 | } |
| 1712 | nla_nest_end(skb, list); |
| 1713 | |
Patrick McHardy | 86f1ec3 | 2015-03-03 20:04:20 +0000 | [diff] [blame] | 1714 | if (rule->udata) { |
| 1715 | struct nft_userdata *udata = nft_userdata(rule); |
| 1716 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, |
| 1717 | udata->data) < 0) |
| 1718 | goto nla_put_failure; |
| 1719 | } |
Pablo Neira Ayuso | 0768b3b | 2014-02-19 17:27:06 +0100 | [diff] [blame] | 1720 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 1721 | nlmsg_end(skb, nlh); |
| 1722 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1723 | |
| 1724 | nla_put_failure: |
| 1725 | nlmsg_trim(skb, nlh); |
| 1726 | return -1; |
| 1727 | } |
| 1728 | |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 1729 | static int nf_tables_rule_notify(const struct nft_ctx *ctx, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1730 | const struct nft_rule *rule, |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 1731 | int event) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1732 | { |
| 1733 | struct sk_buff *skb; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1734 | int err; |
| 1735 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 1736 | if (!ctx->report && |
| 1737 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1738 | return 0; |
| 1739 | |
| 1740 | err = -ENOBUFS; |
| 1741 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1742 | if (skb == NULL) |
| 1743 | goto err; |
| 1744 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1745 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
| 1746 | event, 0, ctx->afi->family, ctx->table, |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 1747 | ctx->chain, rule); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1748 | if (err < 0) { |
| 1749 | kfree_skb(skb); |
| 1750 | goto err; |
| 1751 | } |
| 1752 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 1753 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1754 | ctx->report, GFP_KERNEL); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1755 | err: |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 1756 | if (err < 0) { |
| 1757 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
| 1758 | err); |
| 1759 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1760 | return err; |
| 1761 | } |
| 1762 | |
| 1763 | static int nf_tables_dump_rules(struct sk_buff *skb, |
| 1764 | struct netlink_callback *cb) |
| 1765 | { |
| 1766 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
| 1767 | const struct nft_af_info *afi; |
| 1768 | const struct nft_table *table; |
| 1769 | const struct nft_chain *chain; |
| 1770 | const struct nft_rule *rule; |
| 1771 | unsigned int idx = 0, s_idx = cb->args[0]; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1772 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1773 | int family = nfmsg->nfgen_family; |
| 1774 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1775 | rcu_read_lock(); |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 1776 | cb->seq = net->nft.base_seq; |
| 1777 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1778 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1779 | if (family != NFPROTO_UNSPEC && family != afi->family) |
| 1780 | continue; |
| 1781 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1782 | list_for_each_entry_rcu(table, &afi->tables, list) { |
| 1783 | list_for_each_entry_rcu(chain, &table->chains, list) { |
| 1784 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 1785 | if (!nft_rule_is_active(net, rule)) |
| 1786 | goto cont; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1787 | if (idx < s_idx) |
| 1788 | goto cont; |
| 1789 | if (idx > s_idx) |
| 1790 | memset(&cb->args[1], 0, |
| 1791 | sizeof(cb->args) - sizeof(cb->args[0])); |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1792 | 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] | 1793 | cb->nlh->nlmsg_seq, |
| 1794 | NFT_MSG_NEWRULE, |
| 1795 | NLM_F_MULTI | NLM_F_APPEND, |
| 1796 | afi->family, table, chain, rule) < 0) |
| 1797 | goto done; |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 1798 | |
| 1799 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1800 | cont: |
| 1801 | idx++; |
| 1802 | } |
| 1803 | } |
| 1804 | } |
| 1805 | } |
| 1806 | done: |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 1807 | rcu_read_unlock(); |
| 1808 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1809 | cb->args[0] = idx; |
| 1810 | return skb->len; |
| 1811 | } |
| 1812 | |
| 1813 | static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb, |
| 1814 | const struct nlmsghdr *nlh, |
| 1815 | const struct nlattr * const nla[]) |
| 1816 | { |
| 1817 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 1818 | const struct nft_af_info *afi; |
| 1819 | const struct nft_table *table; |
| 1820 | const struct nft_chain *chain; |
| 1821 | const struct nft_rule *rule; |
| 1822 | struct sk_buff *skb2; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1823 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1824 | int family = nfmsg->nfgen_family; |
| 1825 | int err; |
| 1826 | |
| 1827 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 1828 | struct netlink_dump_control c = { |
| 1829 | .dump = nf_tables_dump_rules, |
| 1830 | }; |
| 1831 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 1832 | } |
| 1833 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1834 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1835 | if (IS_ERR(afi)) |
| 1836 | return PTR_ERR(afi); |
| 1837 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1838 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1839 | if (IS_ERR(table)) |
| 1840 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 1841 | if (table->flags & NFT_TABLE_INACTIVE) |
| 1842 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1843 | |
| 1844 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| 1845 | if (IS_ERR(chain)) |
| 1846 | return PTR_ERR(chain); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 1847 | if (chain->flags & NFT_CHAIN_INACTIVE) |
| 1848 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1849 | |
| 1850 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); |
| 1851 | if (IS_ERR(rule)) |
| 1852 | return PTR_ERR(rule); |
| 1853 | |
| 1854 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1855 | if (!skb2) |
| 1856 | return -ENOMEM; |
| 1857 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 1858 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1859 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
| 1860 | family, table, chain, rule); |
| 1861 | if (err < 0) |
| 1862 | goto err; |
| 1863 | |
| 1864 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 1865 | |
| 1866 | err: |
| 1867 | kfree_skb(skb2); |
| 1868 | return err; |
| 1869 | } |
| 1870 | |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 1871 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
| 1872 | struct nft_rule *rule) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1873 | { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1874 | struct nft_expr *expr; |
| 1875 | |
| 1876 | /* |
| 1877 | * Careful: some expressions might not be initialized in case this |
| 1878 | * is called on error from nf_tables_newrule(). |
| 1879 | */ |
| 1880 | expr = nft_expr_first(rule); |
| 1881 | while (expr->ops && expr != nft_expr_last(rule)) { |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 1882 | nf_tables_expr_destroy(ctx, expr); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1883 | expr = nft_expr_next(expr); |
| 1884 | } |
| 1885 | kfree(rule); |
| 1886 | } |
| 1887 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1888 | #define NFT_RULE_MAXEXPRS 128 |
| 1889 | |
| 1890 | static struct nft_expr_info *info; |
| 1891 | |
| 1892 | static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, |
| 1893 | const struct nlmsghdr *nlh, |
| 1894 | const struct nlattr * const nla[]) |
| 1895 | { |
| 1896 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 1897 | struct nft_af_info *afi; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1898 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1899 | struct nft_table *table; |
| 1900 | struct nft_chain *chain; |
| 1901 | struct nft_rule *rule, *old_rule = NULL; |
Patrick McHardy | 86f1ec3 | 2015-03-03 20:04:20 +0000 | [diff] [blame] | 1902 | struct nft_userdata *udata; |
Pablo Neira Ayuso | 1081d11 | 2014-04-04 01:24:07 +0200 | [diff] [blame] | 1903 | struct nft_trans *trans = NULL; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1904 | struct nft_expr *expr; |
| 1905 | struct nft_ctx ctx; |
| 1906 | struct nlattr *tmp; |
Patrick McHardy | 86f1ec3 | 2015-03-03 20:04:20 +0000 | [diff] [blame] | 1907 | unsigned int size, i, n, ulen = 0, usize = 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1908 | int err, rem; |
| 1909 | bool create; |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1910 | u64 handle, pos_handle; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1911 | |
| 1912 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| 1913 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 1914 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1915 | if (IS_ERR(afi)) |
| 1916 | return PTR_ERR(afi); |
| 1917 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 1918 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1919 | if (IS_ERR(table)) |
| 1920 | return PTR_ERR(table); |
| 1921 | |
| 1922 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| 1923 | if (IS_ERR(chain)) |
| 1924 | return PTR_ERR(chain); |
| 1925 | |
| 1926 | if (nla[NFTA_RULE_HANDLE]) { |
| 1927 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); |
| 1928 | rule = __nf_tables_rule_lookup(chain, handle); |
| 1929 | if (IS_ERR(rule)) |
| 1930 | return PTR_ERR(rule); |
| 1931 | |
| 1932 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 1933 | return -EEXIST; |
| 1934 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 1935 | old_rule = rule; |
| 1936 | else |
| 1937 | return -EOPNOTSUPP; |
| 1938 | } else { |
| 1939 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) |
| 1940 | return -EINVAL; |
| 1941 | handle = nf_tables_alloc_handle(table); |
Pablo Neira Ayuso | a0a7379 | 2014-06-10 10:53:01 +0200 | [diff] [blame] | 1942 | |
| 1943 | if (chain->use == UINT_MAX) |
| 1944 | return -EOVERFLOW; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1945 | } |
| 1946 | |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 1947 | if (nla[NFTA_RULE_POSITION]) { |
| 1948 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) |
| 1949 | return -EOPNOTSUPP; |
| 1950 | |
| 1951 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); |
| 1952 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); |
| 1953 | if (IS_ERR(old_rule)) |
| 1954 | return PTR_ERR(old_rule); |
| 1955 | } |
| 1956 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1957 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
| 1958 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1959 | n = 0; |
| 1960 | size = 0; |
| 1961 | if (nla[NFTA_RULE_EXPRESSIONS]) { |
| 1962 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { |
| 1963 | err = -EINVAL; |
| 1964 | if (nla_type(tmp) != NFTA_LIST_ELEM) |
| 1965 | goto err1; |
| 1966 | if (n == NFT_RULE_MAXEXPRS) |
| 1967 | goto err1; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1968 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1969 | if (err < 0) |
| 1970 | goto err1; |
| 1971 | size += info[n].ops->size; |
| 1972 | n++; |
| 1973 | } |
| 1974 | } |
Patrick McHardy | 9889840 | 2015-03-03 20:04:19 +0000 | [diff] [blame] | 1975 | /* Check for overflow of dlen field */ |
| 1976 | err = -EFBIG; |
| 1977 | if (size >= 1 << 12) |
| 1978 | goto err1; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1979 | |
Patrick McHardy | 86f1ec3 | 2015-03-03 20:04:20 +0000 | [diff] [blame] | 1980 | if (nla[NFTA_RULE_USERDATA]) { |
Pablo Neira Ayuso | 0768b3b | 2014-02-19 17:27:06 +0100 | [diff] [blame] | 1981 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
Patrick McHardy | 86f1ec3 | 2015-03-03 20:04:20 +0000 | [diff] [blame] | 1982 | if (ulen > 0) |
| 1983 | usize = sizeof(struct nft_userdata) + ulen; |
| 1984 | } |
Pablo Neira Ayuso | 0768b3b | 2014-02-19 17:27:06 +0100 | [diff] [blame] | 1985 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1986 | err = -ENOMEM; |
Patrick McHardy | 86f1ec3 | 2015-03-03 20:04:20 +0000 | [diff] [blame] | 1987 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1988 | if (rule == NULL) |
| 1989 | goto err1; |
| 1990 | |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 1991 | nft_rule_activate_next(net, rule); |
| 1992 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1993 | rule->handle = handle; |
| 1994 | rule->dlen = size; |
Patrick McHardy | 86f1ec3 | 2015-03-03 20:04:20 +0000 | [diff] [blame] | 1995 | rule->udata = ulen ? 1 : 0; |
Pablo Neira Ayuso | 0768b3b | 2014-02-19 17:27:06 +0100 | [diff] [blame] | 1996 | |
Patrick McHardy | 86f1ec3 | 2015-03-03 20:04:20 +0000 | [diff] [blame] | 1997 | if (ulen) { |
| 1998 | udata = nft_userdata(rule); |
| 1999 | udata->len = ulen - 1; |
| 2000 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); |
| 2001 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2002 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2003 | expr = nft_expr_first(rule); |
| 2004 | for (i = 0; i < n; i++) { |
| 2005 | err = nf_tables_newexpr(&ctx, &info[i], expr); |
| 2006 | if (err < 0) |
| 2007 | goto err2; |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 2008 | info[i].ops = NULL; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2009 | expr = nft_expr_next(expr); |
| 2010 | } |
| 2011 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2012 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2013 | if (nft_rule_is_active_next(net, old_rule)) { |
Pablo Neira Ayuso | ac904ac | 2014-06-10 10:53:03 +0200 | [diff] [blame] | 2014 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 2015 | old_rule); |
Pablo Neira Ayuso | 1081d11 | 2014-04-04 01:24:07 +0200 | [diff] [blame] | 2016 | if (trans == NULL) { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2017 | err = -ENOMEM; |
| 2018 | goto err2; |
| 2019 | } |
Arturo Borrero | ee01d54 | 2014-09-02 16:42:25 +0200 | [diff] [blame] | 2020 | nft_rule_deactivate_next(net, old_rule); |
Pablo Neira Ayuso | ac34b86 | 2014-06-10 10:53:02 +0200 | [diff] [blame] | 2021 | chain->use--; |
Pablo Neira Ayuso | 5bc5c30 | 2014-06-10 10:53:00 +0200 | [diff] [blame] | 2022 | list_add_tail_rcu(&rule->list, &old_rule->list); |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2023 | } else { |
| 2024 | err = -ENOENT; |
| 2025 | goto err2; |
| 2026 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2027 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
Eric Leblond | 5e94846 | 2013-10-10 13:41:44 +0200 | [diff] [blame] | 2028 | if (old_rule) |
| 2029 | list_add_rcu(&rule->list, &old_rule->list); |
| 2030 | else |
| 2031 | list_add_tail_rcu(&rule->list, &chain->rules); |
| 2032 | else { |
| 2033 | if (old_rule) |
| 2034 | list_add_tail_rcu(&rule->list, &old_rule->list); |
| 2035 | else |
| 2036 | list_add_rcu(&rule->list, &chain->rules); |
| 2037 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2038 | |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 2039 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2040 | err = -ENOMEM; |
| 2041 | goto err3; |
| 2042 | } |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 2043 | chain->use++; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2044 | return 0; |
| 2045 | |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2046 | err3: |
| 2047 | list_del_rcu(&rule->list); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2048 | err2: |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 2049 | nf_tables_rule_destroy(&ctx, rule); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2050 | err1: |
| 2051 | for (i = 0; i < n; i++) { |
| 2052 | if (info[i].ops != NULL) |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 2053 | module_put(info[i].ops->type->owner); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2054 | } |
| 2055 | return err; |
| 2056 | } |
| 2057 | |
| 2058 | static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb, |
| 2059 | const struct nlmsghdr *nlh, |
| 2060 | const struct nlattr * const nla[]) |
| 2061 | { |
| 2062 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2063 | struct nft_af_info *afi; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2064 | struct net *net = sock_net(skb->sk); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2065 | struct nft_table *table; |
Pablo Neira Ayuso | cf9dc09 | 2013-11-24 20:39:10 +0100 | [diff] [blame] | 2066 | struct nft_chain *chain = NULL; |
| 2067 | struct nft_rule *rule; |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2068 | int family = nfmsg->nfgen_family, err = 0; |
| 2069 | struct nft_ctx ctx; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2070 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2071 | afi = nf_tables_afinfo_lookup(net, family, false); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2072 | if (IS_ERR(afi)) |
| 2073 | return PTR_ERR(afi); |
| 2074 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 2075 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2076 | if (IS_ERR(table)) |
| 2077 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 2078 | if (table->flags & NFT_TABLE_INACTIVE) |
| 2079 | return -ENOENT; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2080 | |
Pablo Neira Ayuso | cf9dc09 | 2013-11-24 20:39:10 +0100 | [diff] [blame] | 2081 | if (nla[NFTA_RULE_CHAIN]) { |
| 2082 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| 2083 | if (IS_ERR(chain)) |
| 2084 | return PTR_ERR(chain); |
| 2085 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2086 | |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2087 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
| 2088 | |
Pablo Neira Ayuso | cf9dc09 | 2013-11-24 20:39:10 +0100 | [diff] [blame] | 2089 | if (chain) { |
| 2090 | if (nla[NFTA_RULE_HANDLE]) { |
| 2091 | rule = nf_tables_rule_lookup(chain, |
| 2092 | nla[NFTA_RULE_HANDLE]); |
| 2093 | if (IS_ERR(rule)) |
| 2094 | return PTR_ERR(rule); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2095 | |
Arturo Borrero | 5e266fe | 2014-09-02 16:42:21 +0200 | [diff] [blame] | 2096 | err = nft_delrule(&ctx, rule); |
Pablo Neira Ayuso | cf9dc09 | 2013-11-24 20:39:10 +0100 | [diff] [blame] | 2097 | } else { |
Arturo Borrero | ce24b72 | 2014-09-02 16:42:24 +0200 | [diff] [blame] | 2098 | err = nft_delrule_by_chain(&ctx); |
Pablo Neira Ayuso | cf9dc09 | 2013-11-24 20:39:10 +0100 | [diff] [blame] | 2099 | } |
| 2100 | } else { |
| 2101 | list_for_each_entry(chain, &table->chains, list) { |
| 2102 | ctx.chain = chain; |
Arturo Borrero | ce24b72 | 2014-09-02 16:42:24 +0200 | [diff] [blame] | 2103 | err = nft_delrule_by_chain(&ctx); |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2104 | if (err < 0) |
| 2105 | break; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2106 | } |
| 2107 | } |
| 2108 | |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 2109 | return err; |
| 2110 | } |
| 2111 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2112 | /* |
| 2113 | * Sets |
| 2114 | */ |
| 2115 | |
| 2116 | static LIST_HEAD(nf_tables_set_ops); |
| 2117 | |
| 2118 | int nft_register_set(struct nft_set_ops *ops) |
| 2119 | { |
| 2120 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2121 | list_add_tail_rcu(&ops->list, &nf_tables_set_ops); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2122 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 2123 | return 0; |
| 2124 | } |
| 2125 | EXPORT_SYMBOL_GPL(nft_register_set); |
| 2126 | |
| 2127 | void nft_unregister_set(struct nft_set_ops *ops) |
| 2128 | { |
| 2129 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2130 | list_del_rcu(&ops->list); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2131 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 2132 | } |
| 2133 | EXPORT_SYMBOL_GPL(nft_unregister_set); |
| 2134 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2135 | /* |
| 2136 | * Select a set implementation based on the data characteristics and the |
| 2137 | * given policy. The total memory use might not be known if no size is |
| 2138 | * given, in that case the amount of memory per element is used. |
| 2139 | */ |
| 2140 | static const struct nft_set_ops * |
| 2141 | nft_select_set_ops(const struct nlattr * const nla[], |
| 2142 | const struct nft_set_desc *desc, |
| 2143 | enum nft_set_policies policy) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2144 | { |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2145 | const struct nft_set_ops *ops, *bops; |
| 2146 | struct nft_set_estimate est, best; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2147 | u32 features; |
| 2148 | |
| 2149 | #ifdef CONFIG_MODULES |
| 2150 | if (list_empty(&nf_tables_set_ops)) { |
| 2151 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| 2152 | request_module("nft-set"); |
| 2153 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| 2154 | if (!list_empty(&nf_tables_set_ops)) |
| 2155 | return ERR_PTR(-EAGAIN); |
| 2156 | } |
| 2157 | #endif |
| 2158 | features = 0; |
| 2159 | if (nla[NFTA_SET_FLAGS] != NULL) { |
| 2160 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); |
| 2161 | features &= NFT_SET_INTERVAL | NFT_SET_MAP; |
| 2162 | } |
| 2163 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2164 | bops = NULL; |
| 2165 | best.size = ~0; |
| 2166 | best.class = ~0; |
| 2167 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2168 | list_for_each_entry(ops, &nf_tables_set_ops, list) { |
| 2169 | if ((ops->features & features) != features) |
| 2170 | continue; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2171 | if (!ops->estimate(desc, features, &est)) |
| 2172 | continue; |
| 2173 | |
| 2174 | switch (policy) { |
| 2175 | case NFT_SET_POL_PERFORMANCE: |
| 2176 | if (est.class < best.class) |
| 2177 | break; |
| 2178 | if (est.class == best.class && est.size < best.size) |
| 2179 | break; |
| 2180 | continue; |
| 2181 | case NFT_SET_POL_MEMORY: |
| 2182 | if (est.size < best.size) |
| 2183 | break; |
| 2184 | if (est.size == best.size && est.class < best.class) |
| 2185 | break; |
| 2186 | continue; |
| 2187 | default: |
| 2188 | break; |
| 2189 | } |
| 2190 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2191 | if (!try_module_get(ops->owner)) |
| 2192 | continue; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2193 | if (bops != NULL) |
| 2194 | module_put(bops->owner); |
| 2195 | |
| 2196 | bops = ops; |
| 2197 | best = est; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2198 | } |
| 2199 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2200 | if (bops != NULL) |
| 2201 | return bops; |
| 2202 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2203 | return ERR_PTR(-EOPNOTSUPP); |
| 2204 | } |
| 2205 | |
| 2206 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { |
| 2207 | [NFTA_SET_TABLE] = { .type = NLA_STRING }, |
Pablo Neira Ayuso | a9bdd83 | 2014-03-24 15:10:37 +0100 | [diff] [blame] | 2208 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
| 2209 | .len = IFNAMSIZ - 1 }, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2210 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
| 2211 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, |
| 2212 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, |
| 2213 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, |
| 2214 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2215 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
| 2216 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2217 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2218 | }; |
| 2219 | |
| 2220 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { |
| 2221 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2222 | }; |
| 2223 | |
| 2224 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, |
| 2225 | const struct sk_buff *skb, |
| 2226 | const struct nlmsghdr *nlh, |
| 2227 | const struct nlattr * const nla[]) |
| 2228 | { |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2229 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2230 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2231 | struct nft_af_info *afi = NULL; |
| 2232 | struct nft_table *table = NULL; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2233 | |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2234 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
| 2235 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
| 2236 | if (IS_ERR(afi)) |
| 2237 | return PTR_ERR(afi); |
| 2238 | } |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2239 | |
| 2240 | if (nla[NFTA_SET_TABLE] != NULL) { |
Patrick McHardy | ec2c993 | 2014-02-05 15:03:35 +0000 | [diff] [blame] | 2241 | if (afi == NULL) |
| 2242 | return -EAFNOSUPPORT; |
| 2243 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 2244 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2245 | if (IS_ERR(table)) |
| 2246 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 2247 | if (table->flags & NFT_TABLE_INACTIVE) |
| 2248 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2249 | } |
| 2250 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 2251 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2252 | return 0; |
| 2253 | } |
| 2254 | |
| 2255 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, |
| 2256 | const struct nlattr *nla) |
| 2257 | { |
| 2258 | struct nft_set *set; |
| 2259 | |
| 2260 | if (nla == NULL) |
| 2261 | return ERR_PTR(-EINVAL); |
| 2262 | |
| 2263 | list_for_each_entry(set, &table->sets, list) { |
| 2264 | if (!nla_strcmp(nla, set->name)) |
| 2265 | return set; |
| 2266 | } |
| 2267 | return ERR_PTR(-ENOENT); |
| 2268 | } |
| 2269 | |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2270 | struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
| 2271 | const struct nlattr *nla) |
| 2272 | { |
| 2273 | struct nft_trans *trans; |
| 2274 | u32 id = ntohl(nla_get_be32(nla)); |
| 2275 | |
| 2276 | list_for_each_entry(trans, &net->nft.commit_list, list) { |
| 2277 | if (trans->msg_type == NFT_MSG_NEWSET && |
| 2278 | id == nft_trans_set_id(trans)) |
| 2279 | return nft_trans_set(trans); |
| 2280 | } |
| 2281 | return ERR_PTR(-ENOENT); |
| 2282 | } |
| 2283 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2284 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
| 2285 | const char *name) |
| 2286 | { |
| 2287 | const struct nft_set *i; |
| 2288 | const char *p; |
| 2289 | unsigned long *inuse; |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2290 | unsigned int n = 0, min = 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2291 | |
| 2292 | p = strnchr(name, IFNAMSIZ, '%'); |
| 2293 | if (p != NULL) { |
| 2294 | if (p[1] != 'd' || strchr(p + 2, '%')) |
| 2295 | return -EINVAL; |
| 2296 | |
| 2297 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); |
| 2298 | if (inuse == NULL) |
| 2299 | return -ENOMEM; |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2300 | cont: |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2301 | list_for_each_entry(i, &ctx->table->sets, list) { |
Daniel Borkmann | 1466291 | 2013-12-31 12:40:05 +0100 | [diff] [blame] | 2302 | int tmp; |
| 2303 | |
| 2304 | if (!sscanf(i->name, name, &tmp)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2305 | continue; |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2306 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2307 | continue; |
Daniel Borkmann | 1466291 | 2013-12-31 12:40:05 +0100 | [diff] [blame] | 2308 | |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2309 | set_bit(tmp - min, inuse); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2310 | } |
| 2311 | |
Patrick McHardy | 53b7028 | 2014-02-05 12:26:22 +0100 | [diff] [blame] | 2312 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2313 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
| 2314 | min += BITS_PER_BYTE * PAGE_SIZE; |
| 2315 | memset(inuse, 0, PAGE_SIZE); |
| 2316 | goto cont; |
| 2317 | } |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2318 | free_page((unsigned long)inuse); |
| 2319 | } |
| 2320 | |
Patrick McHardy | 60eb189 | 2014-03-07 12:34:05 +0100 | [diff] [blame] | 2321 | snprintf(set->name, sizeof(set->name), name, min + n); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2322 | list_for_each_entry(i, &ctx->table->sets, list) { |
| 2323 | if (!strcmp(set->name, i->name)) |
| 2324 | return -ENFILE; |
| 2325 | } |
| 2326 | return 0; |
| 2327 | } |
| 2328 | |
| 2329 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, |
| 2330 | const struct nft_set *set, u16 event, u16 flags) |
| 2331 | { |
| 2332 | struct nfgenmsg *nfmsg; |
| 2333 | struct nlmsghdr *nlh; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2334 | struct nlattr *desc; |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 2335 | u32 portid = ctx->portid; |
| 2336 | u32 seq = ctx->seq; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2337 | |
| 2338 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 2339 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
| 2340 | flags); |
| 2341 | if (nlh == NULL) |
| 2342 | goto nla_put_failure; |
| 2343 | |
| 2344 | nfmsg = nlmsg_data(nlh); |
| 2345 | nfmsg->nfgen_family = ctx->afi->family; |
| 2346 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 2347 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2348 | |
| 2349 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) |
| 2350 | goto nla_put_failure; |
| 2351 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) |
| 2352 | goto nla_put_failure; |
| 2353 | if (set->flags != 0) |
| 2354 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) |
| 2355 | goto nla_put_failure; |
| 2356 | |
| 2357 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) |
| 2358 | goto nla_put_failure; |
| 2359 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) |
| 2360 | goto nla_put_failure; |
| 2361 | if (set->flags & NFT_SET_MAP) { |
| 2362 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) |
| 2363 | goto nla_put_failure; |
| 2364 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) |
| 2365 | goto nla_put_failure; |
| 2366 | } |
| 2367 | |
Arturo Borrero | 9363dc4 | 2014-09-23 13:30:41 +0200 | [diff] [blame] | 2368 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
| 2369 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) |
| 2370 | goto nla_put_failure; |
| 2371 | } |
| 2372 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2373 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
| 2374 | if (desc == NULL) |
| 2375 | goto nla_put_failure; |
| 2376 | if (set->size && |
| 2377 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) |
| 2378 | goto nla_put_failure; |
| 2379 | nla_nest_end(skb, desc); |
| 2380 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 2381 | nlmsg_end(skb, nlh); |
| 2382 | return 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2383 | |
| 2384 | nla_put_failure: |
| 2385 | nlmsg_trim(skb, nlh); |
| 2386 | return -1; |
| 2387 | } |
| 2388 | |
| 2389 | static int nf_tables_set_notify(const struct nft_ctx *ctx, |
| 2390 | const struct nft_set *set, |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 2391 | int event, gfp_t gfp_flags) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2392 | { |
| 2393 | struct sk_buff *skb; |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 2394 | u32 portid = ctx->portid; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2395 | int err; |
| 2396 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 2397 | if (!ctx->report && |
| 2398 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2399 | return 0; |
| 2400 | |
| 2401 | err = -ENOBUFS; |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 2402 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2403 | if (skb == NULL) |
| 2404 | goto err; |
| 2405 | |
| 2406 | err = nf_tables_fill_set(skb, ctx, set, event, 0); |
| 2407 | if (err < 0) { |
| 2408 | kfree_skb(skb); |
| 2409 | goto err; |
| 2410 | } |
| 2411 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 2412 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 2413 | ctx->report, gfp_flags); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2414 | err: |
| 2415 | if (err < 0) |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2416 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2417 | return err; |
| 2418 | } |
| 2419 | |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2420 | 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] | 2421 | { |
| 2422 | const struct nft_set *set; |
| 2423 | unsigned int idx, s_idx = cb->args[0]; |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2424 | struct nft_af_info *afi; |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2425 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
| 2426 | struct net *net = sock_net(skb->sk); |
| 2427 | int cur_family = cb->args[3]; |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2428 | struct nft_ctx *ctx = cb->data, ctx_set; |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2429 | |
| 2430 | if (cb->args[1]) |
| 2431 | return skb->len; |
| 2432 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2433 | rcu_read_lock(); |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 2434 | cb->seq = net->nft.base_seq; |
| 2435 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2436 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2437 | if (ctx->afi && ctx->afi != afi) |
| 2438 | continue; |
| 2439 | |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2440 | if (cur_family) { |
| 2441 | if (afi->family != cur_family) |
| 2442 | continue; |
| 2443 | |
| 2444 | cur_family = 0; |
| 2445 | } |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2446 | list_for_each_entry_rcu(table, &afi->tables, list) { |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2447 | if (ctx->table && ctx->table != table) |
| 2448 | continue; |
| 2449 | |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2450 | if (cur_table) { |
| 2451 | if (cur_table != table) |
| 2452 | continue; |
| 2453 | |
| 2454 | cur_table = NULL; |
| 2455 | } |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2456 | idx = 0; |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2457 | list_for_each_entry_rcu(set, &table->sets, list) { |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2458 | if (idx < s_idx) |
| 2459 | goto cont; |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2460 | |
| 2461 | ctx_set = *ctx; |
| 2462 | ctx_set.table = table; |
| 2463 | ctx_set.afi = afi; |
| 2464 | if (nf_tables_fill_set(skb, &ctx_set, set, |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2465 | NFT_MSG_NEWSET, |
| 2466 | NLM_F_MULTI) < 0) { |
| 2467 | cb->args[0] = idx; |
| 2468 | cb->args[2] = (unsigned long) table; |
| 2469 | cb->args[3] = afi->family; |
| 2470 | goto done; |
| 2471 | } |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 2472 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2473 | cont: |
| 2474 | idx++; |
| 2475 | } |
| 2476 | if (s_idx) |
| 2477 | s_idx = 0; |
| 2478 | } |
| 2479 | } |
| 2480 | cb->args[1] = 1; |
| 2481 | done: |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2482 | rcu_read_unlock(); |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2483 | return skb->len; |
| 2484 | } |
| 2485 | |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2486 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2487 | { |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2488 | kfree(cb->data); |
| 2489 | return 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2490 | } |
| 2491 | |
| 2492 | static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb, |
| 2493 | const struct nlmsghdr *nlh, |
| 2494 | const struct nlattr * const nla[]) |
| 2495 | { |
| 2496 | const struct nft_set *set; |
| 2497 | struct nft_ctx ctx; |
| 2498 | struct sk_buff *skb2; |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2499 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2500 | int err; |
| 2501 | |
stephen hemminger | 01cfa0a | 2014-10-29 22:57:19 -0700 | [diff] [blame] | 2502 | /* Verify existence before starting dump */ |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2503 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); |
| 2504 | if (err < 0) |
| 2505 | return err; |
| 2506 | |
| 2507 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 2508 | struct netlink_dump_control c = { |
| 2509 | .dump = nf_tables_dump_sets, |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2510 | .done = nf_tables_dump_sets_done, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2511 | }; |
Pablo Neira Ayuso | 5b96af7 | 2014-07-16 17:35:18 +0200 | [diff] [blame] | 2512 | struct nft_ctx *ctx_dump; |
| 2513 | |
| 2514 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); |
| 2515 | if (ctx_dump == NULL) |
| 2516 | return -ENOMEM; |
| 2517 | |
| 2518 | *ctx_dump = ctx; |
| 2519 | c.data = ctx_dump; |
| 2520 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2521 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 2522 | } |
| 2523 | |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2524 | /* Only accept unspec with dump */ |
| 2525 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
| 2526 | return -EAFNOSUPPORT; |
| 2527 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2528 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
| 2529 | if (IS_ERR(set)) |
| 2530 | return PTR_ERR(set); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2531 | if (set->flags & NFT_SET_INACTIVE) |
| 2532 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2533 | |
| 2534 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 2535 | if (skb2 == NULL) |
| 2536 | return -ENOMEM; |
| 2537 | |
| 2538 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); |
| 2539 | if (err < 0) |
| 2540 | goto err; |
| 2541 | |
| 2542 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 2543 | |
| 2544 | err: |
| 2545 | kfree_skb(skb2); |
| 2546 | return err; |
| 2547 | } |
| 2548 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2549 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
| 2550 | struct nft_set_desc *desc, |
| 2551 | const struct nlattr *nla) |
| 2552 | { |
| 2553 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; |
| 2554 | int err; |
| 2555 | |
| 2556 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy); |
| 2557 | if (err < 0) |
| 2558 | return err; |
| 2559 | |
| 2560 | if (da[NFTA_SET_DESC_SIZE] != NULL) |
| 2561 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); |
| 2562 | |
| 2563 | return 0; |
| 2564 | } |
| 2565 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2566 | static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb, |
| 2567 | const struct nlmsghdr *nlh, |
| 2568 | const struct nlattr * const nla[]) |
| 2569 | { |
| 2570 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| 2571 | const struct nft_set_ops *ops; |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2572 | struct nft_af_info *afi; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2573 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2574 | struct nft_table *table; |
| 2575 | struct nft_set *set; |
| 2576 | struct nft_ctx ctx; |
| 2577 | char name[IFNAMSIZ]; |
| 2578 | unsigned int size; |
| 2579 | bool create; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2580 | u32 ktype, dtype, flags, policy; |
| 2581 | struct nft_set_desc desc; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2582 | int err; |
| 2583 | |
| 2584 | if (nla[NFTA_SET_TABLE] == NULL || |
| 2585 | nla[NFTA_SET_NAME] == NULL || |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2586 | nla[NFTA_SET_KEY_LEN] == NULL || |
| 2587 | nla[NFTA_SET_ID] == NULL) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2588 | return -EINVAL; |
| 2589 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2590 | memset(&desc, 0, sizeof(desc)); |
| 2591 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2592 | ktype = NFT_DATA_VALUE; |
| 2593 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { |
| 2594 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); |
| 2595 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) |
| 2596 | return -EINVAL; |
| 2597 | } |
| 2598 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2599 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
| 2600 | if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2601 | return -EINVAL; |
| 2602 | |
| 2603 | flags = 0; |
| 2604 | if (nla[NFTA_SET_FLAGS] != NULL) { |
| 2605 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); |
| 2606 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | |
| 2607 | NFT_SET_INTERVAL | NFT_SET_MAP)) |
| 2608 | return -EINVAL; |
| 2609 | } |
| 2610 | |
| 2611 | dtype = 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2612 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
| 2613 | if (!(flags & NFT_SET_MAP)) |
| 2614 | return -EINVAL; |
| 2615 | |
| 2616 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); |
| 2617 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && |
| 2618 | dtype != NFT_DATA_VERDICT) |
| 2619 | return -EINVAL; |
| 2620 | |
| 2621 | if (dtype != NFT_DATA_VERDICT) { |
| 2622 | if (nla[NFTA_SET_DATA_LEN] == NULL) |
| 2623 | return -EINVAL; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2624 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
| 2625 | if (desc.dlen == 0 || |
| 2626 | desc.dlen > FIELD_SIZEOF(struct nft_data, data)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2627 | return -EINVAL; |
| 2628 | } else |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2629 | desc.dlen = sizeof(struct nft_data); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2630 | } else if (flags & NFT_SET_MAP) |
| 2631 | return -EINVAL; |
| 2632 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2633 | policy = NFT_SET_POL_PERFORMANCE; |
| 2634 | if (nla[NFTA_SET_POLICY] != NULL) |
| 2635 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); |
| 2636 | |
| 2637 | if (nla[NFTA_SET_DESC] != NULL) { |
| 2638 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); |
| 2639 | if (err < 0) |
| 2640 | return err; |
| 2641 | } |
| 2642 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2643 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| 2644 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2645 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2646 | if (IS_ERR(afi)) |
| 2647 | return PTR_ERR(afi); |
| 2648 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 2649 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2650 | if (IS_ERR(table)) |
| 2651 | return PTR_ERR(table); |
| 2652 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 2653 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2654 | |
| 2655 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); |
| 2656 | if (IS_ERR(set)) { |
| 2657 | if (PTR_ERR(set) != -ENOENT) |
| 2658 | return PTR_ERR(set); |
| 2659 | set = NULL; |
| 2660 | } |
| 2661 | |
| 2662 | if (set != NULL) { |
| 2663 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
| 2664 | return -EEXIST; |
| 2665 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| 2666 | return -EOPNOTSUPP; |
| 2667 | return 0; |
| 2668 | } |
| 2669 | |
| 2670 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) |
| 2671 | return -ENOENT; |
| 2672 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2673 | ops = nft_select_set_ops(nla, &desc, policy); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2674 | if (IS_ERR(ops)) |
| 2675 | return PTR_ERR(ops); |
| 2676 | |
| 2677 | size = 0; |
| 2678 | if (ops->privsize != NULL) |
| 2679 | size = ops->privsize(nla); |
| 2680 | |
| 2681 | err = -ENOMEM; |
| 2682 | set = kzalloc(sizeof(*set) + size, GFP_KERNEL); |
| 2683 | if (set == NULL) |
| 2684 | goto err1; |
| 2685 | |
| 2686 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); |
| 2687 | err = nf_tables_set_alloc_name(&ctx, set, name); |
| 2688 | if (err < 0) |
| 2689 | goto err2; |
| 2690 | |
| 2691 | INIT_LIST_HEAD(&set->bindings); |
| 2692 | set->ops = ops; |
| 2693 | set->ktype = ktype; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2694 | set->klen = desc.klen; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2695 | set->dtype = dtype; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2696 | set->dlen = desc.dlen; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2697 | set->flags = flags; |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2698 | set->size = desc.size; |
Arturo Borrero | 9363dc4 | 2014-09-23 13:30:41 +0200 | [diff] [blame] | 2699 | set->policy = policy; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2700 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 2701 | err = ops->init(set, &desc, nla); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2702 | if (err < 0) |
| 2703 | goto err2; |
| 2704 | |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2705 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2706 | if (err < 0) |
| 2707 | goto err2; |
| 2708 | |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2709 | list_add_tail_rcu(&set->list, &table->sets); |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 2710 | table->use++; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2711 | return 0; |
| 2712 | |
| 2713 | err2: |
| 2714 | kfree(set); |
| 2715 | err1: |
| 2716 | module_put(ops->owner); |
| 2717 | return err; |
| 2718 | } |
| 2719 | |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2720 | static void nft_set_destroy(struct nft_set *set) |
| 2721 | { |
| 2722 | set->ops->destroy(set); |
| 2723 | module_put(set->ops->owner); |
| 2724 | kfree(set); |
| 2725 | } |
| 2726 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2727 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
| 2728 | { |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2729 | list_del_rcu(&set->list); |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 2730 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2731 | nft_set_destroy(set); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2732 | } |
| 2733 | |
| 2734 | static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb, |
| 2735 | const struct nlmsghdr *nlh, |
| 2736 | const struct nlattr * const nla[]) |
| 2737 | { |
Pablo Neira Ayuso | c9c8e48 | 2013-12-26 16:49:03 +0100 | [diff] [blame] | 2738 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2739 | struct nft_set *set; |
| 2740 | struct nft_ctx ctx; |
| 2741 | int err; |
| 2742 | |
Patrick McHardy | ec2c993 | 2014-02-05 15:03:35 +0000 | [diff] [blame] | 2743 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
| 2744 | return -EAFNOSUPPORT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2745 | if (nla[NFTA_SET_TABLE] == NULL) |
| 2746 | return -EINVAL; |
| 2747 | |
| 2748 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); |
| 2749 | if (err < 0) |
| 2750 | return err; |
| 2751 | |
| 2752 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
| 2753 | if (IS_ERR(set)) |
| 2754 | return PTR_ERR(set); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2755 | if (set->flags & NFT_SET_INACTIVE) |
| 2756 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2757 | if (!list_empty(&set->bindings)) |
| 2758 | return -EBUSY; |
| 2759 | |
Arturo Borrero | ee01d54 | 2014-09-02 16:42:25 +0200 | [diff] [blame] | 2760 | return nft_delset(&ctx, set); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2761 | } |
| 2762 | |
| 2763 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, |
| 2764 | const struct nft_set *set, |
| 2765 | const struct nft_set_iter *iter, |
| 2766 | const struct nft_set_elem *elem) |
| 2767 | { |
| 2768 | enum nft_registers dreg; |
| 2769 | |
| 2770 | dreg = nft_type_to_reg(set->dtype); |
Pablo Neira Ayuso | 2ee0d3c | 2013-12-28 00:59:38 +0100 | [diff] [blame] | 2771 | return nft_validate_data_load(ctx, dreg, &elem->data, |
| 2772 | set->dtype == NFT_DATA_VERDICT ? |
| 2773 | NFT_DATA_VERDICT : NFT_DATA_VALUE); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2774 | } |
| 2775 | |
| 2776 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, |
| 2777 | struct nft_set_binding *binding) |
| 2778 | { |
| 2779 | struct nft_set_binding *i; |
| 2780 | struct nft_set_iter iter; |
| 2781 | |
| 2782 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) |
| 2783 | return -EBUSY; |
| 2784 | |
| 2785 | if (set->flags & NFT_SET_MAP) { |
| 2786 | /* If the set is already bound to the same chain all |
| 2787 | * jumps are already validated for that chain. |
| 2788 | */ |
| 2789 | list_for_each_entry(i, &set->bindings, list) { |
| 2790 | if (i->chain == binding->chain) |
| 2791 | goto bind; |
| 2792 | } |
| 2793 | |
| 2794 | iter.skip = 0; |
| 2795 | iter.count = 0; |
| 2796 | iter.err = 0; |
| 2797 | iter.fn = nf_tables_bind_check_setelem; |
| 2798 | |
| 2799 | set->ops->walk(ctx, set, &iter); |
| 2800 | if (iter.err < 0) { |
| 2801 | /* Destroy anonymous sets if binding fails */ |
| 2802 | if (set->flags & NFT_SET_ANONYMOUS) |
| 2803 | nf_tables_set_destroy(ctx, set); |
| 2804 | |
| 2805 | return iter.err; |
| 2806 | } |
| 2807 | } |
| 2808 | bind: |
| 2809 | binding->chain = ctx->chain; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2810 | list_add_tail_rcu(&binding->list, &set->bindings); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2811 | return 0; |
| 2812 | } |
| 2813 | |
| 2814 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, |
| 2815 | struct nft_set_binding *binding) |
| 2816 | { |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 2817 | list_del_rcu(&binding->list); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2818 | |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2819 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
| 2820 | !(set->flags & NFT_SET_INACTIVE)) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2821 | nf_tables_set_destroy(ctx, set); |
| 2822 | } |
| 2823 | |
| 2824 | /* |
| 2825 | * Set elements |
| 2826 | */ |
| 2827 | |
| 2828 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { |
| 2829 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, |
| 2830 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, |
| 2831 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, |
| 2832 | }; |
| 2833 | |
| 2834 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { |
| 2835 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING }, |
| 2836 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING }, |
| 2837 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2838 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2839 | }; |
| 2840 | |
| 2841 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, |
| 2842 | const struct sk_buff *skb, |
| 2843 | const struct nlmsghdr *nlh, |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 2844 | const struct nlattr * const nla[], |
| 2845 | bool trans) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2846 | { |
| 2847 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 2848 | struct nft_af_info *afi; |
| 2849 | struct nft_table *table; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2850 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2851 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 2852 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2853 | if (IS_ERR(afi)) |
| 2854 | return PTR_ERR(afi); |
| 2855 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 2856 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2857 | if (IS_ERR(table)) |
| 2858 | return PTR_ERR(table); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 2859 | if (!trans && (table->flags & NFT_TABLE_INACTIVE)) |
| 2860 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2861 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 2862 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2863 | return 0; |
| 2864 | } |
| 2865 | |
| 2866 | static int nf_tables_fill_setelem(struct sk_buff *skb, |
| 2867 | const struct nft_set *set, |
| 2868 | const struct nft_set_elem *elem) |
| 2869 | { |
| 2870 | unsigned char *b = skb_tail_pointer(skb); |
| 2871 | struct nlattr *nest; |
| 2872 | |
| 2873 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); |
| 2874 | if (nest == NULL) |
| 2875 | goto nla_put_failure; |
| 2876 | |
| 2877 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE, |
| 2878 | set->klen) < 0) |
| 2879 | goto nla_put_failure; |
| 2880 | |
| 2881 | if (set->flags & NFT_SET_MAP && |
| 2882 | !(elem->flags & NFT_SET_ELEM_INTERVAL_END) && |
| 2883 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data, |
| 2884 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
| 2885 | set->dlen) < 0) |
| 2886 | goto nla_put_failure; |
| 2887 | |
| 2888 | if (elem->flags != 0) |
| 2889 | if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags))) |
| 2890 | goto nla_put_failure; |
| 2891 | |
| 2892 | nla_nest_end(skb, nest); |
| 2893 | return 0; |
| 2894 | |
| 2895 | nla_put_failure: |
| 2896 | nlmsg_trim(skb, b); |
| 2897 | return -EMSGSIZE; |
| 2898 | } |
| 2899 | |
| 2900 | struct nft_set_dump_args { |
| 2901 | const struct netlink_callback *cb; |
| 2902 | struct nft_set_iter iter; |
| 2903 | struct sk_buff *skb; |
| 2904 | }; |
| 2905 | |
| 2906 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, |
| 2907 | const struct nft_set *set, |
| 2908 | const struct nft_set_iter *iter, |
| 2909 | const struct nft_set_elem *elem) |
| 2910 | { |
| 2911 | struct nft_set_dump_args *args; |
| 2912 | |
| 2913 | args = container_of(iter, struct nft_set_dump_args, iter); |
| 2914 | return nf_tables_fill_setelem(args->skb, set, elem); |
| 2915 | } |
| 2916 | |
| 2917 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
| 2918 | { |
| 2919 | const struct nft_set *set; |
| 2920 | struct nft_set_dump_args args; |
| 2921 | struct nft_ctx ctx; |
| 2922 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; |
| 2923 | struct nfgenmsg *nfmsg; |
| 2924 | struct nlmsghdr *nlh; |
| 2925 | struct nlattr *nest; |
| 2926 | u32 portid, seq; |
| 2927 | int event, err; |
| 2928 | |
Michal Nazarewicz | 720e0df | 2014-01-01 06:27:19 +0100 | [diff] [blame] | 2929 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
| 2930 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2931 | if (err < 0) |
| 2932 | return err; |
| 2933 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 2934 | err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla, |
| 2935 | false); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2936 | if (err < 0) |
| 2937 | return err; |
| 2938 | |
| 2939 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| 2940 | if (IS_ERR(set)) |
| 2941 | return PTR_ERR(set); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 2942 | if (set->flags & NFT_SET_INACTIVE) |
| 2943 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2944 | |
| 2945 | event = NFT_MSG_NEWSETELEM; |
| 2946 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 2947 | portid = NETLINK_CB(cb->skb).portid; |
| 2948 | seq = cb->nlh->nlmsg_seq; |
| 2949 | |
| 2950 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
| 2951 | NLM_F_MULTI); |
| 2952 | if (nlh == NULL) |
| 2953 | goto nla_put_failure; |
| 2954 | |
| 2955 | nfmsg = nlmsg_data(nlh); |
Pablo Neira Ayuso | 6403d96 | 2014-06-11 19:05:28 +0200 | [diff] [blame] | 2956 | nfmsg->nfgen_family = ctx.afi->family; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2957 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 2958 | nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 2959 | |
| 2960 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) |
| 2961 | goto nla_put_failure; |
| 2962 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) |
| 2963 | goto nla_put_failure; |
| 2964 | |
| 2965 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); |
| 2966 | if (nest == NULL) |
| 2967 | goto nla_put_failure; |
| 2968 | |
| 2969 | args.cb = cb; |
| 2970 | args.skb = skb; |
| 2971 | args.iter.skip = cb->args[0]; |
| 2972 | args.iter.count = 0; |
| 2973 | args.iter.err = 0; |
| 2974 | args.iter.fn = nf_tables_dump_setelem; |
| 2975 | set->ops->walk(&ctx, set, &args.iter); |
| 2976 | |
| 2977 | nla_nest_end(skb, nest); |
| 2978 | nlmsg_end(skb, nlh); |
| 2979 | |
| 2980 | if (args.iter.err && args.iter.err != -EMSGSIZE) |
| 2981 | return args.iter.err; |
| 2982 | if (args.iter.count == cb->args[0]) |
| 2983 | return 0; |
| 2984 | |
| 2985 | cb->args[0] = args.iter.count; |
| 2986 | return skb->len; |
| 2987 | |
| 2988 | nla_put_failure: |
| 2989 | return -ENOSPC; |
| 2990 | } |
| 2991 | |
| 2992 | static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb, |
| 2993 | const struct nlmsghdr *nlh, |
| 2994 | const struct nlattr * const nla[]) |
| 2995 | { |
| 2996 | const struct nft_set *set; |
| 2997 | struct nft_ctx ctx; |
| 2998 | int err; |
| 2999 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3000 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3001 | if (err < 0) |
| 3002 | return err; |
| 3003 | |
| 3004 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| 3005 | if (IS_ERR(set)) |
| 3006 | return PTR_ERR(set); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3007 | if (set->flags & NFT_SET_INACTIVE) |
| 3008 | return -ENOENT; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3009 | |
| 3010 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 3011 | struct netlink_dump_control c = { |
| 3012 | .dump = nf_tables_dump_set, |
| 3013 | }; |
| 3014 | return netlink_dump_start(nlsk, skb, nlh, &c); |
| 3015 | } |
| 3016 | return -EOPNOTSUPP; |
| 3017 | } |
| 3018 | |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3019 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
| 3020 | const struct nft_ctx *ctx, u32 seq, |
| 3021 | u32 portid, int event, u16 flags, |
| 3022 | const struct nft_set *set, |
| 3023 | const struct nft_set_elem *elem) |
| 3024 | { |
| 3025 | struct nfgenmsg *nfmsg; |
| 3026 | struct nlmsghdr *nlh; |
| 3027 | struct nlattr *nest; |
| 3028 | int err; |
| 3029 | |
| 3030 | event |= NFNL_SUBSYS_NFTABLES << 8; |
| 3031 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
| 3032 | flags); |
| 3033 | if (nlh == NULL) |
| 3034 | goto nla_put_failure; |
| 3035 | |
| 3036 | nfmsg = nlmsg_data(nlh); |
| 3037 | nfmsg->nfgen_family = ctx->afi->family; |
| 3038 | nfmsg->version = NFNETLINK_V0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 3039 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3040 | |
| 3041 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) |
| 3042 | goto nla_put_failure; |
| 3043 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) |
| 3044 | goto nla_put_failure; |
| 3045 | |
| 3046 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); |
| 3047 | if (nest == NULL) |
| 3048 | goto nla_put_failure; |
| 3049 | |
| 3050 | err = nf_tables_fill_setelem(skb, set, elem); |
| 3051 | if (err < 0) |
| 3052 | goto nla_put_failure; |
| 3053 | |
| 3054 | nla_nest_end(skb, nest); |
| 3055 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 3056 | nlmsg_end(skb, nlh); |
| 3057 | return 0; |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3058 | |
| 3059 | nla_put_failure: |
| 3060 | nlmsg_trim(skb, nlh); |
| 3061 | return -1; |
| 3062 | } |
| 3063 | |
| 3064 | static int nf_tables_setelem_notify(const struct nft_ctx *ctx, |
| 3065 | const struct nft_set *set, |
| 3066 | const struct nft_set_elem *elem, |
| 3067 | int event, u16 flags) |
| 3068 | { |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 3069 | struct net *net = ctx->net; |
| 3070 | u32 portid = ctx->portid; |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3071 | struct sk_buff *skb; |
| 3072 | int err; |
| 3073 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 3074 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3075 | return 0; |
| 3076 | |
| 3077 | err = -ENOBUFS; |
| 3078 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 3079 | if (skb == NULL) |
| 3080 | goto err; |
| 3081 | |
| 3082 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, |
| 3083 | set, elem); |
| 3084 | if (err < 0) { |
| 3085 | kfree_skb(skb); |
| 3086 | goto err; |
| 3087 | } |
| 3088 | |
Pablo Neira Ayuso | 128ad33 | 2014-05-09 17:14:24 +0200 | [diff] [blame] | 3089 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
Arturo Borrero | d60ce62 | 2014-04-01 14:06:07 +0200 | [diff] [blame] | 3090 | GFP_KERNEL); |
| 3091 | err: |
| 3092 | if (err < 0) |
| 3093 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); |
| 3094 | return err; |
| 3095 | } |
| 3096 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3097 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
| 3098 | int msg_type, |
| 3099 | struct nft_set *set) |
| 3100 | { |
| 3101 | struct nft_trans *trans; |
| 3102 | |
| 3103 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); |
| 3104 | if (trans == NULL) |
| 3105 | return NULL; |
| 3106 | |
| 3107 | nft_trans_elem_set(trans) = set; |
| 3108 | return trans; |
| 3109 | } |
| 3110 | |
| 3111 | 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] | 3112 | const struct nlattr *attr) |
| 3113 | { |
| 3114 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; |
| 3115 | struct nft_data_desc d1, d2; |
| 3116 | struct nft_set_elem elem; |
| 3117 | struct nft_set_binding *binding; |
| 3118 | enum nft_registers dreg; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3119 | struct nft_trans *trans; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3120 | int err; |
| 3121 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 3122 | if (set->size && set->nelems == set->size) |
| 3123 | return -ENFILE; |
| 3124 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3125 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, |
| 3126 | nft_set_elem_policy); |
| 3127 | if (err < 0) |
| 3128 | return err; |
| 3129 | |
| 3130 | if (nla[NFTA_SET_ELEM_KEY] == NULL) |
| 3131 | return -EINVAL; |
| 3132 | |
| 3133 | elem.flags = 0; |
| 3134 | if (nla[NFTA_SET_ELEM_FLAGS] != NULL) { |
| 3135 | elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS])); |
| 3136 | if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END) |
| 3137 | return -EINVAL; |
| 3138 | } |
| 3139 | |
| 3140 | if (set->flags & NFT_SET_MAP) { |
| 3141 | if (nla[NFTA_SET_ELEM_DATA] == NULL && |
| 3142 | !(elem.flags & NFT_SET_ELEM_INTERVAL_END)) |
| 3143 | return -EINVAL; |
Pablo Neira Ayuso | bd7fc64 | 2014-02-07 12:53:07 +0100 | [diff] [blame] | 3144 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
| 3145 | elem.flags & NFT_SET_ELEM_INTERVAL_END) |
| 3146 | return -EINVAL; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3147 | } else { |
| 3148 | if (nla[NFTA_SET_ELEM_DATA] != NULL) |
| 3149 | return -EINVAL; |
| 3150 | } |
| 3151 | |
| 3152 | err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]); |
| 3153 | if (err < 0) |
| 3154 | goto err1; |
| 3155 | err = -EINVAL; |
| 3156 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) |
| 3157 | goto err2; |
| 3158 | |
| 3159 | err = -EEXIST; |
| 3160 | if (set->ops->get(set, &elem) == 0) |
| 3161 | goto err2; |
| 3162 | |
| 3163 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
| 3164 | err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]); |
| 3165 | if (err < 0) |
| 3166 | goto err2; |
| 3167 | |
| 3168 | err = -EINVAL; |
| 3169 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) |
| 3170 | goto err3; |
| 3171 | |
| 3172 | dreg = nft_type_to_reg(set->dtype); |
| 3173 | list_for_each_entry(binding, &set->bindings, list) { |
| 3174 | struct nft_ctx bind_ctx = { |
| 3175 | .afi = ctx->afi, |
| 3176 | .table = ctx->table, |
Pablo Neira Ayuso | 7c95f6d | 2014-04-04 01:22:45 +0200 | [diff] [blame] | 3177 | .chain = (struct nft_chain *)binding->chain, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3178 | }; |
| 3179 | |
| 3180 | err = nft_validate_data_load(&bind_ctx, dreg, |
| 3181 | &elem.data, d2.type); |
| 3182 | if (err < 0) |
| 3183 | goto err3; |
| 3184 | } |
| 3185 | } |
| 3186 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3187 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
| 3188 | if (trans == NULL) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3189 | goto err3; |
| 3190 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3191 | err = set->ops->insert(set, &elem); |
| 3192 | if (err < 0) |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3193 | goto err4; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3194 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3195 | nft_trans_elem(trans) = elem; |
Pablo Neira Ayuso | 46bbafc | 2014-05-22 12:36:03 +0200 | [diff] [blame] | 3196 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3197 | return 0; |
| 3198 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3199 | err4: |
| 3200 | kfree(trans); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3201 | err3: |
| 3202 | if (nla[NFTA_SET_ELEM_DATA] != NULL) |
| 3203 | nft_data_uninit(&elem.data, d2.type); |
| 3204 | err2: |
| 3205 | nft_data_uninit(&elem.key, d1.type); |
| 3206 | err1: |
| 3207 | return err; |
| 3208 | } |
| 3209 | |
| 3210 | static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb, |
| 3211 | const struct nlmsghdr *nlh, |
| 3212 | const struct nlattr * const nla[]) |
| 3213 | { |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3214 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3215 | const struct nlattr *attr; |
| 3216 | struct nft_set *set; |
| 3217 | struct nft_ctx ctx; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3218 | int rem, err = 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3219 | |
Pablo Neira Ayuso | 7d5570c | 2014-07-25 13:15:36 +0200 | [diff] [blame] | 3220 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
| 3221 | return -EINVAL; |
| 3222 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3223 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3224 | if (err < 0) |
| 3225 | return err; |
| 3226 | |
| 3227 | 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] | 3228 | if (IS_ERR(set)) { |
| 3229 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { |
| 3230 | set = nf_tables_set_lookup_byid(net, |
| 3231 | nla[NFTA_SET_ELEM_LIST_SET_ID]); |
| 3232 | } |
| 3233 | if (IS_ERR(set)) |
| 3234 | return PTR_ERR(set); |
| 3235 | } |
| 3236 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3237 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
| 3238 | return -EBUSY; |
| 3239 | |
| 3240 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
| 3241 | err = nft_add_set_elem(&ctx, set, attr); |
| 3242 | if (err < 0) |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3243 | break; |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3244 | |
| 3245 | set->nelems++; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3246 | } |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3247 | return err; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3248 | } |
| 3249 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3250 | 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] | 3251 | const struct nlattr *attr) |
| 3252 | { |
| 3253 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; |
| 3254 | struct nft_data_desc desc; |
| 3255 | struct nft_set_elem elem; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3256 | struct nft_trans *trans; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3257 | int err; |
| 3258 | |
| 3259 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, |
| 3260 | nft_set_elem_policy); |
| 3261 | if (err < 0) |
| 3262 | goto err1; |
| 3263 | |
| 3264 | err = -EINVAL; |
| 3265 | if (nla[NFTA_SET_ELEM_KEY] == NULL) |
| 3266 | goto err1; |
| 3267 | |
| 3268 | err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]); |
| 3269 | if (err < 0) |
| 3270 | goto err1; |
| 3271 | |
| 3272 | err = -EINVAL; |
| 3273 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) |
| 3274 | goto err2; |
| 3275 | |
| 3276 | err = set->ops->get(set, &elem); |
| 3277 | if (err < 0) |
| 3278 | goto err2; |
| 3279 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3280 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
Julia Lawall | 609ccf0 | 2014-08-07 14:49:08 +0200 | [diff] [blame] | 3281 | if (trans == NULL) { |
| 3282 | err = -ENOMEM; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3283 | goto err2; |
Julia Lawall | 609ccf0 | 2014-08-07 14:49:08 +0200 | [diff] [blame] | 3284 | } |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3285 | |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3286 | nft_trans_elem(trans) = elem; |
Pablo Neira Ayuso | 46bbafc | 2014-05-22 12:36:03 +0200 | [diff] [blame] | 3287 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
Thomas Graf | 0dc1362 | 2014-08-01 17:25:38 +0200 | [diff] [blame] | 3288 | return 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3289 | err2: |
| 3290 | nft_data_uninit(&elem.key, desc.type); |
| 3291 | err1: |
| 3292 | return err; |
| 3293 | } |
| 3294 | |
| 3295 | static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb, |
| 3296 | const struct nlmsghdr *nlh, |
| 3297 | const struct nlattr * const nla[]) |
| 3298 | { |
| 3299 | const struct nlattr *attr; |
| 3300 | struct nft_set *set; |
| 3301 | struct nft_ctx ctx; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3302 | int rem, err = 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3303 | |
Pablo Neira Ayuso | 7d5570c | 2014-07-25 13:15:36 +0200 | [diff] [blame] | 3304 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
| 3305 | return -EINVAL; |
| 3306 | |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3307 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3308 | if (err < 0) |
| 3309 | return err; |
| 3310 | |
| 3311 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| 3312 | if (IS_ERR(set)) |
| 3313 | return PTR_ERR(set); |
| 3314 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
| 3315 | return -EBUSY; |
| 3316 | |
| 3317 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
| 3318 | err = nft_del_setelem(&ctx, set, attr); |
| 3319 | if (err < 0) |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3320 | break; |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3321 | |
| 3322 | set->nelems--; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3323 | } |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3324 | return err; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3325 | } |
| 3326 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 3327 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
| 3328 | u32 portid, u32 seq) |
| 3329 | { |
| 3330 | struct nlmsghdr *nlh; |
| 3331 | struct nfgenmsg *nfmsg; |
| 3332 | int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN; |
| 3333 | |
| 3334 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); |
| 3335 | if (nlh == NULL) |
| 3336 | goto nla_put_failure; |
| 3337 | |
| 3338 | nfmsg = nlmsg_data(nlh); |
| 3339 | nfmsg->nfgen_family = AF_UNSPEC; |
| 3340 | nfmsg->version = NFNETLINK_V0; |
| 3341 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
| 3342 | |
| 3343 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq))) |
| 3344 | goto nla_put_failure; |
| 3345 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 3346 | nlmsg_end(skb, nlh); |
| 3347 | return 0; |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 3348 | |
| 3349 | nla_put_failure: |
| 3350 | nlmsg_trim(skb, nlh); |
| 3351 | return -EMSGSIZE; |
| 3352 | } |
| 3353 | |
| 3354 | static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event) |
| 3355 | { |
| 3356 | struct nlmsghdr *nlh = nlmsg_hdr(skb); |
| 3357 | struct sk_buff *skb2; |
| 3358 | int err; |
| 3359 | |
| 3360 | if (nlmsg_report(nlh) && |
| 3361 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
| 3362 | return 0; |
| 3363 | |
| 3364 | err = -ENOBUFS; |
| 3365 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 3366 | if (skb2 == NULL) |
| 3367 | goto err; |
| 3368 | |
| 3369 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, |
| 3370 | nlh->nlmsg_seq); |
| 3371 | if (err < 0) { |
| 3372 | kfree_skb(skb2); |
| 3373 | goto err; |
| 3374 | } |
| 3375 | |
| 3376 | err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, |
| 3377 | NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL); |
| 3378 | err: |
| 3379 | if (err < 0) { |
| 3380 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
| 3381 | err); |
| 3382 | } |
| 3383 | return err; |
| 3384 | } |
| 3385 | |
| 3386 | static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb, |
| 3387 | const struct nlmsghdr *nlh, |
| 3388 | const struct nlattr * const nla[]) |
| 3389 | { |
| 3390 | struct net *net = sock_net(skb->sk); |
| 3391 | struct sk_buff *skb2; |
| 3392 | int err; |
| 3393 | |
| 3394 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 3395 | if (skb2 == NULL) |
| 3396 | return -ENOMEM; |
| 3397 | |
| 3398 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, |
| 3399 | nlh->nlmsg_seq); |
| 3400 | if (err < 0) |
| 3401 | goto err; |
| 3402 | |
| 3403 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| 3404 | err: |
| 3405 | kfree_skb(skb2); |
| 3406 | return err; |
| 3407 | } |
| 3408 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3409 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
| 3410 | [NFT_MSG_NEWTABLE] = { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3411 | .call_batch = nf_tables_newtable, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3412 | .attr_count = NFTA_TABLE_MAX, |
| 3413 | .policy = nft_table_policy, |
| 3414 | }, |
| 3415 | [NFT_MSG_GETTABLE] = { |
| 3416 | .call = nf_tables_gettable, |
| 3417 | .attr_count = NFTA_TABLE_MAX, |
| 3418 | .policy = nft_table_policy, |
| 3419 | }, |
| 3420 | [NFT_MSG_DELTABLE] = { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3421 | .call_batch = nf_tables_deltable, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3422 | .attr_count = NFTA_TABLE_MAX, |
| 3423 | .policy = nft_table_policy, |
| 3424 | }, |
| 3425 | [NFT_MSG_NEWCHAIN] = { |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3426 | .call_batch = nf_tables_newchain, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3427 | .attr_count = NFTA_CHAIN_MAX, |
| 3428 | .policy = nft_chain_policy, |
| 3429 | }, |
| 3430 | [NFT_MSG_GETCHAIN] = { |
| 3431 | .call = nf_tables_getchain, |
| 3432 | .attr_count = NFTA_CHAIN_MAX, |
| 3433 | .policy = nft_chain_policy, |
| 3434 | }, |
| 3435 | [NFT_MSG_DELCHAIN] = { |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3436 | .call_batch = nf_tables_delchain, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3437 | .attr_count = NFTA_CHAIN_MAX, |
| 3438 | .policy = nft_chain_policy, |
| 3439 | }, |
| 3440 | [NFT_MSG_NEWRULE] = { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 3441 | .call_batch = nf_tables_newrule, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3442 | .attr_count = NFTA_RULE_MAX, |
| 3443 | .policy = nft_rule_policy, |
| 3444 | }, |
| 3445 | [NFT_MSG_GETRULE] = { |
| 3446 | .call = nf_tables_getrule, |
| 3447 | .attr_count = NFTA_RULE_MAX, |
| 3448 | .policy = nft_rule_policy, |
| 3449 | }, |
| 3450 | [NFT_MSG_DELRULE] = { |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 3451 | .call_batch = nf_tables_delrule, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3452 | .attr_count = NFTA_RULE_MAX, |
| 3453 | .policy = nft_rule_policy, |
| 3454 | }, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3455 | [NFT_MSG_NEWSET] = { |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3456 | .call_batch = nf_tables_newset, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3457 | .attr_count = NFTA_SET_MAX, |
| 3458 | .policy = nft_set_policy, |
| 3459 | }, |
| 3460 | [NFT_MSG_GETSET] = { |
| 3461 | .call = nf_tables_getset, |
| 3462 | .attr_count = NFTA_SET_MAX, |
| 3463 | .policy = nft_set_policy, |
| 3464 | }, |
| 3465 | [NFT_MSG_DELSET] = { |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3466 | .call_batch = nf_tables_delset, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3467 | .attr_count = NFTA_SET_MAX, |
| 3468 | .policy = nft_set_policy, |
| 3469 | }, |
| 3470 | [NFT_MSG_NEWSETELEM] = { |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3471 | .call_batch = nf_tables_newsetelem, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3472 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| 3473 | .policy = nft_set_elem_list_policy, |
| 3474 | }, |
| 3475 | [NFT_MSG_GETSETELEM] = { |
| 3476 | .call = nf_tables_getsetelem, |
| 3477 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| 3478 | .policy = nft_set_elem_list_policy, |
| 3479 | }, |
| 3480 | [NFT_MSG_DELSETELEM] = { |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3481 | .call_batch = nf_tables_delsetelem, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3482 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| 3483 | .policy = nft_set_elem_list_policy, |
| 3484 | }, |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 3485 | [NFT_MSG_GETGEN] = { |
| 3486 | .call = nf_tables_getgen, |
| 3487 | }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3488 | }; |
| 3489 | |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3490 | static void nft_chain_commit_update(struct nft_trans *trans) |
| 3491 | { |
| 3492 | struct nft_base_chain *basechain; |
| 3493 | |
| 3494 | if (nft_trans_chain_name(trans)[0]) |
| 3495 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); |
| 3496 | |
| 3497 | if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN)) |
| 3498 | return; |
| 3499 | |
| 3500 | basechain = nft_base_chain(trans->ctx.chain); |
| 3501 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); |
| 3502 | |
| 3503 | switch (nft_trans_chain_policy(trans)) { |
| 3504 | case NF_DROP: |
| 3505 | case NF_ACCEPT: |
| 3506 | basechain->policy = nft_trans_chain_policy(trans); |
| 3507 | break; |
| 3508 | } |
| 3509 | } |
| 3510 | |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3511 | static void nf_tables_commit_release(struct nft_trans *trans) |
Pablo Neira Ayuso | c7c32e7 | 2014-04-10 00:31:10 +0200 | [diff] [blame] | 3512 | { |
Pablo Neira Ayuso | c7c32e7 | 2014-04-10 00:31:10 +0200 | [diff] [blame] | 3513 | switch (trans->msg_type) { |
| 3514 | case NFT_MSG_DELTABLE: |
| 3515 | nf_tables_table_destroy(&trans->ctx); |
| 3516 | break; |
| 3517 | case NFT_MSG_DELCHAIN: |
| 3518 | nf_tables_chain_destroy(trans->ctx.chain); |
| 3519 | break; |
| 3520 | case NFT_MSG_DELRULE: |
| 3521 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); |
| 3522 | break; |
| 3523 | case NFT_MSG_DELSET: |
| 3524 | nft_set_destroy(nft_trans_set(trans)); |
| 3525 | break; |
| 3526 | } |
| 3527 | kfree(trans); |
| 3528 | } |
| 3529 | |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3530 | static int nf_tables_commit(struct sk_buff *skb) |
| 3531 | { |
| 3532 | struct net *net = sock_net(skb->sk); |
| 3533 | struct nft_trans *trans, *next; |
Pablo Neira Ayuso | a3716e7 | 2014-08-01 19:32:41 +0200 | [diff] [blame] | 3534 | struct nft_trans_elem *te; |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3535 | |
| 3536 | /* Bump generation counter, invalidate any dump in progress */ |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 3537 | while (++net->nft.base_seq == 0); |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3538 | |
| 3539 | /* A new generation has just started */ |
| 3540 | net->nft.gencursor = gencursor_next(net); |
| 3541 | |
| 3542 | /* Make sure all packets have left the previous generation before |
| 3543 | * purging old rules. |
| 3544 | */ |
| 3545 | synchronize_rcu(); |
| 3546 | |
| 3547 | 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] | 3548 | switch (trans->msg_type) { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3549 | case NFT_MSG_NEWTABLE: |
| 3550 | if (nft_trans_table_update(trans)) { |
| 3551 | if (!nft_trans_table_enable(trans)) { |
| 3552 | nf_tables_table_disable(trans->ctx.afi, |
| 3553 | trans->ctx.table); |
| 3554 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; |
| 3555 | } |
| 3556 | } else { |
| 3557 | trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE; |
| 3558 | } |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3559 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3560 | nft_trans_destroy(trans); |
| 3561 | break; |
| 3562 | case NFT_MSG_DELTABLE: |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3563 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3564 | break; |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3565 | case NFT_MSG_NEWCHAIN: |
| 3566 | if (nft_trans_chain_update(trans)) |
| 3567 | nft_chain_commit_update(trans); |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3568 | else |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3569 | trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE; |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3570 | |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3571 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3572 | nft_trans_destroy(trans); |
| 3573 | break; |
| 3574 | case NFT_MSG_DELCHAIN: |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3575 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
Arturo Borrero | c559879 | 2014-09-02 16:42:23 +0200 | [diff] [blame] | 3576 | nf_tables_unregister_hooks(trans->ctx.table, |
| 3577 | trans->ctx.chain, |
| 3578 | trans->ctx.afi->nops); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3579 | break; |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3580 | case NFT_MSG_NEWRULE: |
| 3581 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3582 | nf_tables_rule_notify(&trans->ctx, |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3583 | nft_trans_rule(trans), |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3584 | NFT_MSG_NEWRULE); |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3585 | nft_trans_destroy(trans); |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3586 | break; |
| 3587 | case NFT_MSG_DELRULE: |
| 3588 | list_del_rcu(&nft_trans_rule(trans)->list); |
Pablo Neira Ayuso | 35151d8 | 2014-05-05 17:12:40 +0200 | [diff] [blame] | 3589 | nf_tables_rule_notify(&trans->ctx, |
| 3590 | nft_trans_rule(trans), |
| 3591 | NFT_MSG_DELRULE); |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3592 | break; |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3593 | case NFT_MSG_NEWSET: |
| 3594 | nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE; |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3595 | /* This avoids hitting -EBUSY when deleting the table |
| 3596 | * from the transaction. |
| 3597 | */ |
| 3598 | if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS && |
| 3599 | !list_empty(&nft_trans_set(trans)->bindings)) |
| 3600 | trans->ctx.table->use--; |
| 3601 | |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3602 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 3603 | NFT_MSG_NEWSET, GFP_KERNEL); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3604 | nft_trans_destroy(trans); |
| 3605 | break; |
| 3606 | case NFT_MSG_DELSET: |
| 3607 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
Pablo Neira Ayuso | 31f8441 | 2014-05-29 10:29:58 +0200 | [diff] [blame] | 3608 | NFT_MSG_DELSET, GFP_KERNEL); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3609 | break; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3610 | case NFT_MSG_NEWSETELEM: |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3611 | nf_tables_setelem_notify(&trans->ctx, |
| 3612 | nft_trans_elem_set(trans), |
| 3613 | &nft_trans_elem(trans), |
| 3614 | NFT_MSG_NEWSETELEM, 0); |
| 3615 | nft_trans_destroy(trans); |
| 3616 | break; |
| 3617 | case NFT_MSG_DELSETELEM: |
Pablo Neira Ayuso | a3716e7 | 2014-08-01 19:32:41 +0200 | [diff] [blame] | 3618 | te = (struct nft_trans_elem *)trans->data; |
| 3619 | nf_tables_setelem_notify(&trans->ctx, te->set, |
| 3620 | &te->elem, |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3621 | NFT_MSG_DELSETELEM, 0); |
Pablo Neira Ayuso | a3716e7 | 2014-08-01 19:32:41 +0200 | [diff] [blame] | 3622 | te->set->ops->get(te->set, &te->elem); |
Pablo Neira Ayuso | a3716e7 | 2014-08-01 19:32:41 +0200 | [diff] [blame] | 3623 | nft_data_uninit(&te->elem.key, NFT_DATA_VALUE); |
Pablo Neira Ayuso | 02263db | 2015-02-20 17:11:10 +0100 | [diff] [blame] | 3624 | if (te->set->flags & NFT_SET_MAP && |
| 3625 | !(te->elem.flags & NFT_SET_ELEM_INTERVAL_END)) |
| 3626 | nft_data_uninit(&te->elem.data, te->set->dtype); |
| 3627 | te->set->ops->remove(te->set, &te->elem); |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3628 | nft_trans_destroy(trans); |
| 3629 | break; |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3630 | } |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3631 | } |
| 3632 | |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3633 | synchronize_rcu(); |
| 3634 | |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3635 | 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] | 3636 | list_del(&trans->list); |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3637 | nf_tables_commit_release(trans); |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3638 | } |
| 3639 | |
Pablo Neira Ayuso | 84d7fce | 2014-09-04 14:30:22 +0200 | [diff] [blame] | 3640 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); |
| 3641 | |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3642 | return 0; |
| 3643 | } |
| 3644 | |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3645 | static void nf_tables_abort_release(struct nft_trans *trans) |
Pablo Neira Ayuso | c7c32e7 | 2014-04-10 00:31:10 +0200 | [diff] [blame] | 3646 | { |
Pablo Neira Ayuso | c7c32e7 | 2014-04-10 00:31:10 +0200 | [diff] [blame] | 3647 | switch (trans->msg_type) { |
| 3648 | case NFT_MSG_NEWTABLE: |
| 3649 | nf_tables_table_destroy(&trans->ctx); |
| 3650 | break; |
| 3651 | case NFT_MSG_NEWCHAIN: |
| 3652 | nf_tables_chain_destroy(trans->ctx.chain); |
| 3653 | break; |
| 3654 | case NFT_MSG_NEWRULE: |
| 3655 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); |
| 3656 | break; |
| 3657 | case NFT_MSG_NEWSET: |
| 3658 | nft_set_destroy(nft_trans_set(trans)); |
| 3659 | break; |
| 3660 | } |
| 3661 | kfree(trans); |
| 3662 | } |
| 3663 | |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3664 | static int nf_tables_abort(struct sk_buff *skb) |
| 3665 | { |
| 3666 | struct net *net = sock_net(skb->sk); |
| 3667 | struct nft_trans *trans, *next; |
Pablo Neira Ayuso | 02263db | 2015-02-20 17:11:10 +0100 | [diff] [blame] | 3668 | struct nft_trans_elem *te; |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3669 | |
| 3670 | 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] | 3671 | switch (trans->msg_type) { |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3672 | case NFT_MSG_NEWTABLE: |
| 3673 | if (nft_trans_table_update(trans)) { |
| 3674 | if (nft_trans_table_enable(trans)) { |
| 3675 | nf_tables_table_disable(trans->ctx.afi, |
| 3676 | trans->ctx.table); |
| 3677 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; |
| 3678 | } |
| 3679 | nft_trans_destroy(trans); |
| 3680 | } else { |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3681 | list_del_rcu(&trans->ctx.table->list); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3682 | } |
| 3683 | break; |
| 3684 | case NFT_MSG_DELTABLE: |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3685 | list_add_tail_rcu(&trans->ctx.table->list, |
| 3686 | &trans->ctx.afi->tables); |
Pablo Neira Ayuso | 55dd6f9 | 2014-04-03 11:53:37 +0200 | [diff] [blame] | 3687 | nft_trans_destroy(trans); |
| 3688 | break; |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3689 | case NFT_MSG_NEWCHAIN: |
| 3690 | if (nft_trans_chain_update(trans)) { |
Markus Elfring | 982f405 | 2014-11-18 20:37:05 +0100 | [diff] [blame] | 3691 | free_percpu(nft_trans_chain_stats(trans)); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3692 | |
| 3693 | nft_trans_destroy(trans); |
| 3694 | } else { |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3695 | trans->ctx.table->use--; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3696 | list_del_rcu(&trans->ctx.chain->list); |
Arturo Borrero | c559879 | 2014-09-02 16:42:23 +0200 | [diff] [blame] | 3697 | nf_tables_unregister_hooks(trans->ctx.table, |
| 3698 | trans->ctx.chain, |
| 3699 | trans->ctx.afi->nops); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3700 | } |
| 3701 | break; |
| 3702 | case NFT_MSG_DELCHAIN: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3703 | trans->ctx.table->use++; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3704 | list_add_tail_rcu(&trans->ctx.chain->list, |
| 3705 | &trans->ctx.table->chains); |
Pablo Neira Ayuso | 91c7b38 | 2014-04-09 11:58:08 +0200 | [diff] [blame] | 3706 | nft_trans_destroy(trans); |
| 3707 | break; |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3708 | case NFT_MSG_NEWRULE: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3709 | trans->ctx.chain->use--; |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3710 | list_del_rcu(&nft_trans_rule(trans)->list); |
| 3711 | break; |
| 3712 | case NFT_MSG_DELRULE: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3713 | trans->ctx.chain->use++; |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3714 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3715 | nft_trans_destroy(trans); |
Pablo Neira Ayuso | b380e5c | 2014-04-04 01:38:51 +0200 | [diff] [blame] | 3716 | break; |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3717 | case NFT_MSG_NEWSET: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3718 | trans->ctx.table->use--; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3719 | list_del_rcu(&nft_trans_set(trans)->list); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3720 | break; |
| 3721 | case NFT_MSG_DELSET: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3722 | trans->ctx.table->use++; |
Pablo Neira Ayuso | e688a7f | 2014-07-01 11:49:18 +0200 | [diff] [blame] | 3723 | list_add_tail_rcu(&nft_trans_set(trans)->list, |
| 3724 | &trans->ctx.table->sets); |
Pablo Neira Ayuso | 958bee1 | 2014-04-03 11:48:44 +0200 | [diff] [blame] | 3725 | nft_trans_destroy(trans); |
| 3726 | break; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3727 | case NFT_MSG_NEWSETELEM: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3728 | nft_trans_elem_set(trans)->nelems--; |
Pablo Neira Ayuso | 02263db | 2015-02-20 17:11:10 +0100 | [diff] [blame] | 3729 | te = (struct nft_trans_elem *)trans->data; |
| 3730 | te->set->ops->get(te->set, &te->elem); |
| 3731 | nft_data_uninit(&te->elem.key, NFT_DATA_VALUE); |
| 3732 | if (te->set->flags & NFT_SET_MAP && |
| 3733 | !(te->elem.flags & NFT_SET_ELEM_INTERVAL_END)) |
| 3734 | nft_data_uninit(&te->elem.data, te->set->dtype); |
| 3735 | te->set->ops->remove(te->set, &te->elem); |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3736 | nft_trans_destroy(trans); |
| 3737 | break; |
| 3738 | case NFT_MSG_DELSETELEM: |
Pablo Neira Ayuso | 4fefee5 | 2014-05-23 12:39:26 +0200 | [diff] [blame] | 3739 | nft_trans_elem_set(trans)->nelems++; |
Pablo Neira Ayuso | 60319eb | 2014-04-04 03:36:42 +0200 | [diff] [blame] | 3740 | nft_trans_destroy(trans); |
| 3741 | break; |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3742 | } |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3743 | } |
| 3744 | |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3745 | synchronize_rcu(); |
| 3746 | |
Pablo Neira Ayuso | a1cee07 | 2014-05-23 11:09:42 +0200 | [diff] [blame] | 3747 | list_for_each_entry_safe_reverse(trans, next, |
| 3748 | &net->nft.commit_list, list) { |
Pablo Neira Ayuso | c7c32e7 | 2014-04-10 00:31:10 +0200 | [diff] [blame] | 3749 | list_del(&trans->list); |
Pablo Neira Ayuso | b326dd3 | 2014-11-10 21:14:12 +0100 | [diff] [blame] | 3750 | nf_tables_abort_release(trans); |
Pablo Neira Ayuso | 37082f9 | 2014-04-03 11:56:37 +0200 | [diff] [blame] | 3751 | } |
| 3752 | |
| 3753 | return 0; |
| 3754 | } |
| 3755 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3756 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
| 3757 | .name = "nf_tables", |
| 3758 | .subsys_id = NFNL_SUBSYS_NFTABLES, |
| 3759 | .cb_count = NFT_MSG_MAX, |
| 3760 | .cb = nf_tables_cb, |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 3761 | .commit = nf_tables_commit, |
| 3762 | .abort = nf_tables_abort, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3763 | }; |
| 3764 | |
Pablo Neira Ayuso | 7210e4e | 2014-10-13 19:50:22 +0200 | [diff] [blame] | 3765 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
| 3766 | enum nft_chain_type type) |
| 3767 | { |
| 3768 | const struct nft_base_chain *basechain; |
| 3769 | |
| 3770 | if (chain->flags & NFT_BASE_CHAIN) { |
| 3771 | basechain = nft_base_chain(chain); |
| 3772 | if (basechain->type->type != type) |
| 3773 | return -EOPNOTSUPP; |
| 3774 | } |
| 3775 | return 0; |
| 3776 | } |
| 3777 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); |
| 3778 | |
Pablo Neira Ayuso | 75e8d06 | 2015-01-14 15:33:57 +0100 | [diff] [blame] | 3779 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
| 3780 | unsigned int hook_flags) |
| 3781 | { |
| 3782 | struct nft_base_chain *basechain; |
| 3783 | |
| 3784 | if (chain->flags & NFT_BASE_CHAIN) { |
| 3785 | basechain = nft_base_chain(chain); |
| 3786 | |
| 3787 | if ((1 << basechain->ops[0].hooknum) & hook_flags) |
| 3788 | return 0; |
| 3789 | |
| 3790 | return -EOPNOTSUPP; |
| 3791 | } |
| 3792 | |
| 3793 | return 0; |
| 3794 | } |
| 3795 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); |
| 3796 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3797 | /* |
| 3798 | * Loop detection - walk through the ruleset beginning at the destination chain |
| 3799 | * of a new jump until either the source chain is reached (loop) or all |
| 3800 | * reachable chains have been traversed. |
| 3801 | * |
| 3802 | * The loop check is performed whenever a new jump verdict is added to an |
| 3803 | * expression or verdict map or a verdict map is bound to a new chain. |
| 3804 | */ |
| 3805 | |
| 3806 | static int nf_tables_check_loops(const struct nft_ctx *ctx, |
| 3807 | const struct nft_chain *chain); |
| 3808 | |
| 3809 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, |
| 3810 | const struct nft_set *set, |
| 3811 | const struct nft_set_iter *iter, |
| 3812 | const struct nft_set_elem *elem) |
| 3813 | { |
Pablo Neira Ayuso | 62f9c8b | 2014-02-07 14:45:01 +0100 | [diff] [blame] | 3814 | if (elem->flags & NFT_SET_ELEM_INTERVAL_END) |
| 3815 | return 0; |
| 3816 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3817 | switch (elem->data.verdict) { |
| 3818 | case NFT_JUMP: |
| 3819 | case NFT_GOTO: |
| 3820 | return nf_tables_check_loops(ctx, elem->data.chain); |
| 3821 | default: |
| 3822 | return 0; |
| 3823 | } |
| 3824 | } |
| 3825 | |
| 3826 | static int nf_tables_check_loops(const struct nft_ctx *ctx, |
| 3827 | const struct nft_chain *chain) |
| 3828 | { |
| 3829 | const struct nft_rule *rule; |
| 3830 | const struct nft_expr *expr, *last; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3831 | const struct nft_set *set; |
| 3832 | struct nft_set_binding *binding; |
| 3833 | struct nft_set_iter iter; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3834 | |
| 3835 | if (ctx->chain == chain) |
| 3836 | return -ELOOP; |
| 3837 | |
| 3838 | list_for_each_entry(rule, &chain->rules, list) { |
| 3839 | nft_rule_for_each_expr(expr, last, rule) { |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 3840 | const struct nft_data *data = NULL; |
| 3841 | int err; |
| 3842 | |
| 3843 | if (!expr->ops->validate) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3844 | continue; |
| 3845 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 3846 | err = expr->ops->validate(ctx, expr, &data); |
| 3847 | if (err < 0) |
| 3848 | return err; |
| 3849 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3850 | if (data == NULL) |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 3851 | continue; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3852 | |
| 3853 | switch (data->verdict) { |
| 3854 | case NFT_JUMP: |
| 3855 | case NFT_GOTO: |
| 3856 | err = nf_tables_check_loops(ctx, data->chain); |
| 3857 | if (err < 0) |
| 3858 | return err; |
| 3859 | default: |
| 3860 | break; |
| 3861 | } |
| 3862 | } |
| 3863 | } |
| 3864 | |
| 3865 | list_for_each_entry(set, &ctx->table->sets, list) { |
| 3866 | if (!(set->flags & NFT_SET_MAP) || |
| 3867 | set->dtype != NFT_DATA_VERDICT) |
| 3868 | continue; |
| 3869 | |
| 3870 | list_for_each_entry(binding, &set->bindings, list) { |
| 3871 | if (binding->chain != chain) |
| 3872 | continue; |
| 3873 | |
| 3874 | iter.skip = 0; |
| 3875 | iter.count = 0; |
| 3876 | iter.err = 0; |
| 3877 | iter.fn = nf_tables_loop_check_setelem; |
| 3878 | |
| 3879 | set->ops->walk(ctx, set, &iter); |
| 3880 | if (iter.err < 0) |
| 3881 | return iter.err; |
| 3882 | } |
| 3883 | } |
| 3884 | |
| 3885 | return 0; |
| 3886 | } |
| 3887 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3888 | /** |
| 3889 | * nft_validate_input_register - validate an expressions' input register |
| 3890 | * |
| 3891 | * @reg: the register number |
| 3892 | * |
| 3893 | * Validate that the input register is one of the general purpose |
| 3894 | * registers. |
| 3895 | */ |
| 3896 | int nft_validate_input_register(enum nft_registers reg) |
| 3897 | { |
| 3898 | if (reg <= NFT_REG_VERDICT) |
| 3899 | return -EINVAL; |
| 3900 | if (reg > NFT_REG_MAX) |
| 3901 | return -ERANGE; |
| 3902 | return 0; |
| 3903 | } |
| 3904 | EXPORT_SYMBOL_GPL(nft_validate_input_register); |
| 3905 | |
| 3906 | /** |
| 3907 | * nft_validate_output_register - validate an expressions' output register |
| 3908 | * |
| 3909 | * @reg: the register number |
| 3910 | * |
| 3911 | * Validate that the output register is one of the general purpose |
| 3912 | * registers or the verdict register. |
| 3913 | */ |
| 3914 | int nft_validate_output_register(enum nft_registers reg) |
| 3915 | { |
| 3916 | if (reg < NFT_REG_VERDICT) |
| 3917 | return -EINVAL; |
| 3918 | if (reg > NFT_REG_MAX) |
| 3919 | return -ERANGE; |
| 3920 | return 0; |
| 3921 | } |
| 3922 | EXPORT_SYMBOL_GPL(nft_validate_output_register); |
| 3923 | |
| 3924 | /** |
| 3925 | * nft_validate_data_load - validate an expressions' data load |
| 3926 | * |
| 3927 | * @ctx: context of the expression performing the load |
| 3928 | * @reg: the destination register number |
| 3929 | * @data: the data to load |
| 3930 | * @type: the data type |
| 3931 | * |
| 3932 | * Validate that a data load uses the appropriate data type for |
| 3933 | * the destination register. A value of NULL for the data means |
| 3934 | * that its runtime gathered data, which is always of type |
| 3935 | * NFT_DATA_VALUE. |
| 3936 | */ |
| 3937 | int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg, |
| 3938 | const struct nft_data *data, |
| 3939 | enum nft_data_types type) |
| 3940 | { |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3941 | int err; |
| 3942 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3943 | switch (reg) { |
| 3944 | case NFT_REG_VERDICT: |
| 3945 | if (data == NULL || type != NFT_DATA_VERDICT) |
| 3946 | return -EINVAL; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 3947 | |
| 3948 | if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) { |
| 3949 | err = nf_tables_check_loops(ctx, data->chain); |
| 3950 | if (err < 0) |
| 3951 | return err; |
| 3952 | |
| 3953 | if (ctx->chain->level + 1 > data->chain->level) { |
| 3954 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
| 3955 | return -EMLINK; |
| 3956 | data->chain->level = ctx->chain->level + 1; |
| 3957 | } |
| 3958 | } |
| 3959 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3960 | return 0; |
| 3961 | default: |
| 3962 | if (data != NULL && type != NFT_DATA_VALUE) |
| 3963 | return -EINVAL; |
| 3964 | return 0; |
| 3965 | } |
| 3966 | } |
| 3967 | EXPORT_SYMBOL_GPL(nft_validate_data_load); |
| 3968 | |
| 3969 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { |
| 3970 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, |
| 3971 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, |
| 3972 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, |
| 3973 | }; |
| 3974 | |
| 3975 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, |
| 3976 | struct nft_data_desc *desc, const struct nlattr *nla) |
| 3977 | { |
| 3978 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
| 3979 | struct nft_chain *chain; |
| 3980 | int err; |
| 3981 | |
| 3982 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); |
| 3983 | if (err < 0) |
| 3984 | return err; |
| 3985 | |
| 3986 | if (!tb[NFTA_VERDICT_CODE]) |
| 3987 | return -EINVAL; |
| 3988 | data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
| 3989 | |
| 3990 | switch (data->verdict) { |
Patrick McHardy | e0abdad | 2014-02-18 18:06:50 +0000 | [diff] [blame] | 3991 | default: |
| 3992 | switch (data->verdict & NF_VERDICT_MASK) { |
| 3993 | case NF_ACCEPT: |
| 3994 | case NF_DROP: |
| 3995 | case NF_QUEUE: |
| 3996 | break; |
| 3997 | default: |
| 3998 | return -EINVAL; |
| 3999 | } |
| 4000 | /* fall through */ |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4001 | case NFT_CONTINUE: |
| 4002 | case NFT_BREAK: |
| 4003 | case NFT_RETURN: |
| 4004 | desc->len = sizeof(data->verdict); |
| 4005 | break; |
| 4006 | case NFT_JUMP: |
| 4007 | case NFT_GOTO: |
| 4008 | if (!tb[NFTA_VERDICT_CHAIN]) |
| 4009 | return -EINVAL; |
| 4010 | chain = nf_tables_chain_lookup(ctx->table, |
| 4011 | tb[NFTA_VERDICT_CHAIN]); |
| 4012 | if (IS_ERR(chain)) |
| 4013 | return PTR_ERR(chain); |
| 4014 | if (chain->flags & NFT_BASE_CHAIN) |
| 4015 | return -EOPNOTSUPP; |
| 4016 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4017 | chain->use++; |
| 4018 | data->chain = chain; |
| 4019 | desc->len = sizeof(data); |
| 4020 | break; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4021 | } |
| 4022 | |
| 4023 | desc->type = NFT_DATA_VERDICT; |
| 4024 | return 0; |
| 4025 | } |
| 4026 | |
| 4027 | static void nft_verdict_uninit(const struct nft_data *data) |
| 4028 | { |
| 4029 | switch (data->verdict) { |
| 4030 | case NFT_JUMP: |
| 4031 | case NFT_GOTO: |
| 4032 | data->chain->use--; |
| 4033 | break; |
| 4034 | } |
| 4035 | } |
| 4036 | |
| 4037 | static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) |
| 4038 | { |
| 4039 | struct nlattr *nest; |
| 4040 | |
| 4041 | nest = nla_nest_start(skb, NFTA_DATA_VERDICT); |
| 4042 | if (!nest) |
| 4043 | goto nla_put_failure; |
| 4044 | |
| 4045 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict))) |
| 4046 | goto nla_put_failure; |
| 4047 | |
| 4048 | switch (data->verdict) { |
| 4049 | case NFT_JUMP: |
| 4050 | case NFT_GOTO: |
| 4051 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name)) |
| 4052 | goto nla_put_failure; |
| 4053 | } |
| 4054 | nla_nest_end(skb, nest); |
| 4055 | return 0; |
| 4056 | |
| 4057 | nla_put_failure: |
| 4058 | return -1; |
| 4059 | } |
| 4060 | |
| 4061 | static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data, |
| 4062 | struct nft_data_desc *desc, const struct nlattr *nla) |
| 4063 | { |
| 4064 | unsigned int len; |
| 4065 | |
| 4066 | len = nla_len(nla); |
| 4067 | if (len == 0) |
| 4068 | return -EINVAL; |
| 4069 | if (len > sizeof(data->data)) |
| 4070 | return -EOVERFLOW; |
| 4071 | |
| 4072 | nla_memcpy(data->data, nla, sizeof(data->data)); |
| 4073 | desc->type = NFT_DATA_VALUE; |
| 4074 | desc->len = len; |
| 4075 | return 0; |
| 4076 | } |
| 4077 | |
| 4078 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, |
| 4079 | unsigned int len) |
| 4080 | { |
| 4081 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); |
| 4082 | } |
| 4083 | |
| 4084 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { |
| 4085 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY, |
| 4086 | .len = FIELD_SIZEOF(struct nft_data, data) }, |
| 4087 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
| 4088 | }; |
| 4089 | |
| 4090 | /** |
| 4091 | * nft_data_init - parse nf_tables data netlink attributes |
| 4092 | * |
| 4093 | * @ctx: context of the expression using the data |
| 4094 | * @data: destination struct nft_data |
| 4095 | * @desc: data description |
| 4096 | * @nla: netlink attribute containing data |
| 4097 | * |
| 4098 | * Parse the netlink data attributes and initialize a struct nft_data. |
| 4099 | * The type and length of data are returned in the data description. |
| 4100 | * |
| 4101 | * The caller can indicate that it only wants to accept data of type |
| 4102 | * NFT_DATA_VALUE by passing NULL for the ctx argument. |
| 4103 | */ |
| 4104 | int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, |
| 4105 | struct nft_data_desc *desc, const struct nlattr *nla) |
| 4106 | { |
| 4107 | struct nlattr *tb[NFTA_DATA_MAX + 1]; |
| 4108 | int err; |
| 4109 | |
| 4110 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); |
| 4111 | if (err < 0) |
| 4112 | return err; |
| 4113 | |
| 4114 | if (tb[NFTA_DATA_VALUE]) |
| 4115 | return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); |
| 4116 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
| 4117 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); |
| 4118 | return -EINVAL; |
| 4119 | } |
| 4120 | EXPORT_SYMBOL_GPL(nft_data_init); |
| 4121 | |
| 4122 | /** |
| 4123 | * nft_data_uninit - release a nft_data item |
| 4124 | * |
| 4125 | * @data: struct nft_data to release |
| 4126 | * @type: type of data |
| 4127 | * |
| 4128 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, |
| 4129 | * all others need to be released by calling this function. |
| 4130 | */ |
| 4131 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) |
| 4132 | { |
| 4133 | switch (type) { |
| 4134 | case NFT_DATA_VALUE: |
| 4135 | return; |
| 4136 | case NFT_DATA_VERDICT: |
| 4137 | return nft_verdict_uninit(data); |
| 4138 | default: |
| 4139 | WARN_ON(1); |
| 4140 | } |
| 4141 | } |
| 4142 | EXPORT_SYMBOL_GPL(nft_data_uninit); |
| 4143 | |
| 4144 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, |
| 4145 | enum nft_data_types type, unsigned int len) |
| 4146 | { |
| 4147 | struct nlattr *nest; |
| 4148 | int err; |
| 4149 | |
| 4150 | nest = nla_nest_start(skb, attr); |
| 4151 | if (nest == NULL) |
| 4152 | return -1; |
| 4153 | |
| 4154 | switch (type) { |
| 4155 | case NFT_DATA_VALUE: |
| 4156 | err = nft_value_dump(skb, data, len); |
| 4157 | break; |
| 4158 | case NFT_DATA_VERDICT: |
| 4159 | err = nft_verdict_dump(skb, data); |
| 4160 | break; |
| 4161 | default: |
| 4162 | err = -EINVAL; |
| 4163 | WARN_ON(1); |
| 4164 | } |
| 4165 | |
| 4166 | nla_nest_end(skb, nest); |
| 4167 | return err; |
| 4168 | } |
| 4169 | EXPORT_SYMBOL_GPL(nft_data_dump); |
| 4170 | |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 4171 | static int nf_tables_init_net(struct net *net) |
| 4172 | { |
| 4173 | INIT_LIST_HEAD(&net->nft.af_info); |
Pablo Neira Ayuso | 0628b12 | 2013-10-14 11:05:33 +0200 | [diff] [blame] | 4174 | INIT_LIST_HEAD(&net->nft.commit_list); |
Pablo Neira Ayuso | 38e029f | 2014-07-01 12:23:12 +0200 | [diff] [blame] | 4175 | net->nft.base_seq = 1; |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 4176 | return 0; |
| 4177 | } |
| 4178 | |
| 4179 | static struct pernet_operations nf_tables_net_ops = { |
| 4180 | .init = nf_tables_init_net, |
| 4181 | }; |
| 4182 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4183 | static int __init nf_tables_module_init(void) |
| 4184 | { |
| 4185 | int err; |
| 4186 | |
| 4187 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, |
| 4188 | GFP_KERNEL); |
| 4189 | if (info == NULL) { |
| 4190 | err = -ENOMEM; |
| 4191 | goto err1; |
| 4192 | } |
| 4193 | |
| 4194 | err = nf_tables_core_module_init(); |
| 4195 | if (err < 0) |
| 4196 | goto err2; |
| 4197 | |
| 4198 | err = nfnetlink_subsys_register(&nf_tables_subsys); |
| 4199 | if (err < 0) |
| 4200 | goto err3; |
| 4201 | |
| 4202 | 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] | 4203 | return register_pernet_subsys(&nf_tables_net_ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4204 | err3: |
| 4205 | nf_tables_core_module_exit(); |
| 4206 | err2: |
| 4207 | kfree(info); |
| 4208 | err1: |
| 4209 | return err; |
| 4210 | } |
| 4211 | |
| 4212 | static void __exit nf_tables_module_exit(void) |
| 4213 | { |
Pablo Neira Ayuso | 99633ab | 2013-10-10 23:28:33 +0200 | [diff] [blame] | 4214 | unregister_pernet_subsys(&nf_tables_net_ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4215 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
Pablo Neira Ayuso | 1b1bc49 | 2014-10-01 13:53:20 +0200 | [diff] [blame] | 4216 | rcu_barrier(); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4217 | nf_tables_core_module_exit(); |
| 4218 | kfree(info); |
| 4219 | } |
| 4220 | |
| 4221 | module_init(nf_tables_module_init); |
| 4222 | module_exit(nf_tables_module_exit); |
| 4223 | |
| 4224 | MODULE_LICENSE("GPL"); |
| 4225 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 4226 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |