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Commit | Line | Data |
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96518518 | 1 | /* |
20a69341 | 2 | * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
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> | |
99633ab2 | 21 | #include <net/net_namespace.h> |
96518518 PM |
22 | #include <net/sock.h> |
23 | ||
96518518 PM |
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 | */ | |
99633ab2 | 34 | int nft_register_afinfo(struct net *net, struct nft_af_info *afi) |
96518518 PM |
35 | { |
36 | INIT_LIST_HEAD(&afi->tables); | |
37 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 38 | list_add_tail_rcu(&afi->list, &net->nft.af_info); |
96518518 PM |
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); | |
e688a7f8 | 54 | list_del_rcu(&afi->list); |
96518518 PM |
55 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
56 | } | |
57 | EXPORT_SYMBOL_GPL(nft_unregister_afinfo); | |
58 | ||
99633ab2 | 59 | static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family) |
96518518 PM |
60 | { |
61 | struct nft_af_info *afi; | |
62 | ||
99633ab2 | 63 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
64 | if (afi->family == family) |
65 | return afi; | |
66 | } | |
67 | return NULL; | |
68 | } | |
69 | ||
99633ab2 PNA |
70 | static struct nft_af_info * |
71 | nf_tables_afinfo_lookup(struct net *net, int family, bool autoload) | |
96518518 PM |
72 | { |
73 | struct nft_af_info *afi; | |
74 | ||
99633ab2 | 75 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
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); | |
99633ab2 | 83 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
84 | if (afi != NULL) |
85 | return ERR_PTR(-EAGAIN); | |
86 | } | |
87 | #endif | |
88 | return ERR_PTR(-EAFNOSUPPORT); | |
89 | } | |
90 | ||
7c95f6d8 PNA |
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 | { | |
128ad332 PNA |
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; | |
7c95f6d8 PNA |
107 | } |
108 | ||
b380e5c7 PNA |
109 | static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type, |
110 | u32 size) | |
1081d11b PNA |
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 | ||
b380e5c7 | 118 | trans->msg_type = msg_type; |
1081d11b PNA |
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 | ||
c5598794 AB |
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 | ||
ee01d542 AB |
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 | { | |
ea4bd995 | 201 | return (rule->genmask & nft_genmask_cur(net)) == 0; |
ee01d542 AB |
202 | } |
203 | ||
204 | static inline int | |
205 | nft_rule_is_active_next(struct net *net, const struct nft_rule *rule) | |
206 | { | |
ea4bd995 | 207 | return (rule->genmask & nft_genmask_next(net)) == 0; |
ee01d542 AB |
208 | } |
209 | ||
210 | static inline void | |
211 | nft_rule_activate_next(struct net *net, struct nft_rule *rule) | |
212 | { | |
213 | /* Now inactive, will be active in the future */ | |
ea4bd995 | 214 | rule->genmask = nft_genmask_cur(net); |
ee01d542 AB |
215 | } |
216 | ||
217 | static inline void | |
218 | nft_rule_deactivate_next(struct net *net, struct nft_rule *rule) | |
219 | { | |
ea4bd995 | 220 | rule->genmask = nft_genmask_next(net); |
ee01d542 AB |
221 | } |
222 | ||
223 | static inline void nft_rule_clear(struct net *net, struct nft_rule *rule) | |
224 | { | |
ea4bd995 | 225 | rule->genmask &= ~nft_genmask_next(net); |
ee01d542 AB |
226 | } |
227 | ||
228 | static int | |
229 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) | |
230 | { | |
231 | /* You cannot delete the same rule twice */ | |
232 | if (nft_rule_is_active_next(ctx->net, rule)) { | |
233 | nft_rule_deactivate_next(ctx->net, rule); | |
234 | ctx->chain->use--; | |
235 | return 0; | |
236 | } | |
237 | return -ENOENT; | |
238 | } | |
239 | ||
240 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, | |
241 | struct nft_rule *rule) | |
242 | { | |
243 | struct nft_trans *trans; | |
244 | ||
245 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); | |
246 | if (trans == NULL) | |
247 | return NULL; | |
248 | ||
249 | nft_trans_rule(trans) = rule; | |
250 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
251 | ||
252 | return trans; | |
253 | } | |
254 | ||
255 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) | |
256 | { | |
257 | struct nft_trans *trans; | |
258 | int err; | |
259 | ||
260 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); | |
261 | if (trans == NULL) | |
262 | return -ENOMEM; | |
263 | ||
264 | err = nf_tables_delrule_deactivate(ctx, rule); | |
265 | if (err < 0) { | |
266 | nft_trans_destroy(trans); | |
267 | return err; | |
268 | } | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
273 | static int nft_delrule_by_chain(struct nft_ctx *ctx) | |
274 | { | |
275 | struct nft_rule *rule; | |
276 | int err; | |
277 | ||
278 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
279 | err = nft_delrule(ctx, rule); | |
280 | if (err < 0) | |
281 | return err; | |
282 | } | |
283 | return 0; | |
284 | } | |
285 | ||
286 | /* Internal set flag */ | |
287 | #define NFT_SET_INACTIVE (1 << 15) | |
288 | ||
289 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, | |
290 | struct nft_set *set) | |
291 | { | |
292 | struct nft_trans *trans; | |
293 | ||
294 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); | |
295 | if (trans == NULL) | |
296 | return -ENOMEM; | |
297 | ||
298 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { | |
299 | nft_trans_set_id(trans) = | |
300 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); | |
301 | set->flags |= NFT_SET_INACTIVE; | |
302 | } | |
303 | nft_trans_set(trans) = set; | |
304 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | static int nft_delset(struct nft_ctx *ctx, struct nft_set *set) | |
310 | { | |
311 | int err; | |
312 | ||
313 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); | |
314 | if (err < 0) | |
315 | return err; | |
316 | ||
317 | list_del_rcu(&set->list); | |
318 | ctx->table->use--; | |
319 | ||
320 | return err; | |
321 | } | |
322 | ||
96518518 PM |
323 | /* |
324 | * Tables | |
325 | */ | |
326 | ||
327 | static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, | |
328 | const struct nlattr *nla) | |
329 | { | |
330 | struct nft_table *table; | |
331 | ||
332 | list_for_each_entry(table, &afi->tables, list) { | |
333 | if (!nla_strcmp(nla, table->name)) | |
334 | return table; | |
335 | } | |
336 | return NULL; | |
337 | } | |
338 | ||
339 | static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, | |
9370761c | 340 | const struct nlattr *nla) |
96518518 PM |
341 | { |
342 | struct nft_table *table; | |
343 | ||
344 | if (nla == NULL) | |
345 | return ERR_PTR(-EINVAL); | |
346 | ||
347 | table = nft_table_lookup(afi, nla); | |
348 | if (table != NULL) | |
349 | return table; | |
350 | ||
96518518 PM |
351 | return ERR_PTR(-ENOENT); |
352 | } | |
353 | ||
354 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) | |
355 | { | |
356 | return ++table->hgenerator; | |
357 | } | |
358 | ||
2a37d755 | 359 | static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX]; |
9370761c | 360 | |
2a37d755 | 361 | static const struct nf_chain_type * |
baae3e62 | 362 | __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
9370761c PNA |
363 | { |
364 | int i; | |
365 | ||
baae3e62 | 366 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
367 | if (chain_type[family][i] != NULL && |
368 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 369 | return chain_type[family][i]; |
9370761c | 370 | } |
baae3e62 | 371 | return NULL; |
9370761c PNA |
372 | } |
373 | ||
2a37d755 | 374 | static const struct nf_chain_type * |
baae3e62 PM |
375 | nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
376 | const struct nlattr *nla, | |
377 | bool autoload) | |
9370761c | 378 | { |
2a37d755 | 379 | const struct nf_chain_type *type; |
9370761c PNA |
380 | |
381 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
382 | if (type != NULL) |
383 | return type; | |
9370761c | 384 | #ifdef CONFIG_MODULES |
93b0806f | 385 | if (autoload) { |
9370761c | 386 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2fec6bb6 PNA |
387 | request_module("nft-chain-%u-%.*s", afi->family, |
388 | nla_len(nla), (const char *)nla_data(nla)); | |
9370761c PNA |
389 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
390 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
391 | if (type != NULL) |
392 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
393 | } |
394 | #endif | |
93b0806f | 395 | return ERR_PTR(-ENOENT); |
9370761c PNA |
396 | } |
397 | ||
96518518 | 398 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
1cae565e PNA |
399 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
400 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
9ddf6323 | 401 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
402 | }; |
403 | ||
84d7fce6 PNA |
404 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
405 | u32 portid, u32 seq, int event, u32 flags, | |
406 | int family, const struct nft_table *table) | |
96518518 PM |
407 | { |
408 | struct nlmsghdr *nlh; | |
409 | struct nfgenmsg *nfmsg; | |
410 | ||
411 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
412 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
413 | if (nlh == NULL) | |
414 | goto nla_put_failure; | |
415 | ||
416 | nfmsg = nlmsg_data(nlh); | |
417 | nfmsg->nfgen_family = family; | |
418 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 419 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 | 420 | |
9ddf6323 | 421 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 TB |
422 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
423 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) | |
96518518 PM |
424 | goto nla_put_failure; |
425 | ||
053c095a JB |
426 | nlmsg_end(skb, nlh); |
427 | return 0; | |
96518518 PM |
428 | |
429 | nla_put_failure: | |
430 | nlmsg_trim(skb, nlh); | |
431 | return -1; | |
432 | } | |
433 | ||
35151d84 | 434 | static int nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
435 | { |
436 | struct sk_buff *skb; | |
96518518 PM |
437 | int err; |
438 | ||
128ad332 PNA |
439 | if (!ctx->report && |
440 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
441 | return 0; |
442 | ||
443 | err = -ENOBUFS; | |
444 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
445 | if (skb == NULL) | |
446 | goto err; | |
447 | ||
84d7fce6 PNA |
448 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
449 | event, 0, ctx->afi->family, ctx->table); | |
96518518 PM |
450 | if (err < 0) { |
451 | kfree_skb(skb); | |
452 | goto err; | |
453 | } | |
454 | ||
128ad332 PNA |
455 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
456 | ctx->report, GFP_KERNEL); | |
96518518 | 457 | err: |
128ad332 PNA |
458 | if (err < 0) { |
459 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
460 | err); | |
461 | } | |
96518518 PM |
462 | return err; |
463 | } | |
464 | ||
465 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
466 | struct netlink_callback *cb) | |
467 | { | |
468 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
469 | const struct nft_af_info *afi; | |
470 | const struct nft_table *table; | |
471 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 472 | struct net *net = sock_net(skb->sk); |
96518518 PM |
473 | int family = nfmsg->nfgen_family; |
474 | ||
e688a7f8 | 475 | rcu_read_lock(); |
38e029f1 PNA |
476 | cb->seq = net->nft.base_seq; |
477 | ||
e688a7f8 | 478 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
479 | if (family != NFPROTO_UNSPEC && family != afi->family) |
480 | continue; | |
481 | ||
e688a7f8 | 482 | list_for_each_entry_rcu(table, &afi->tables, list) { |
96518518 PM |
483 | if (idx < s_idx) |
484 | goto cont; | |
485 | if (idx > s_idx) | |
486 | memset(&cb->args[1], 0, | |
487 | sizeof(cb->args) - sizeof(cb->args[0])); | |
84d7fce6 | 488 | if (nf_tables_fill_table_info(skb, net, |
96518518 PM |
489 | NETLINK_CB(cb->skb).portid, |
490 | cb->nlh->nlmsg_seq, | |
491 | NFT_MSG_NEWTABLE, | |
492 | NLM_F_MULTI, | |
493 | afi->family, table) < 0) | |
494 | goto done; | |
38e029f1 PNA |
495 | |
496 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
497 | cont: |
498 | idx++; | |
499 | } | |
500 | } | |
501 | done: | |
e688a7f8 | 502 | rcu_read_unlock(); |
96518518 PM |
503 | cb->args[0] = idx; |
504 | return skb->len; | |
505 | } | |
506 | ||
507 | static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb, | |
508 | const struct nlmsghdr *nlh, | |
509 | const struct nlattr * const nla[]) | |
510 | { | |
511 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
512 | const struct nft_af_info *afi; | |
513 | const struct nft_table *table; | |
514 | struct sk_buff *skb2; | |
99633ab2 | 515 | struct net *net = sock_net(skb->sk); |
96518518 PM |
516 | int family = nfmsg->nfgen_family; |
517 | int err; | |
518 | ||
519 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
520 | struct netlink_dump_control c = { | |
521 | .dump = nf_tables_dump_tables, | |
522 | }; | |
523 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
524 | } | |
525 | ||
99633ab2 | 526 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
527 | if (IS_ERR(afi)) |
528 | return PTR_ERR(afi); | |
529 | ||
9370761c | 530 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
531 | if (IS_ERR(table)) |
532 | return PTR_ERR(table); | |
55dd6f93 PNA |
533 | if (table->flags & NFT_TABLE_INACTIVE) |
534 | return -ENOENT; | |
96518518 PM |
535 | |
536 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
537 | if (!skb2) | |
538 | return -ENOMEM; | |
539 | ||
84d7fce6 | 540 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
541 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
542 | family, table); | |
543 | if (err < 0) | |
544 | goto err; | |
545 | ||
546 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
547 | ||
548 | err: | |
549 | kfree_skb(skb2); | |
550 | return err; | |
551 | } | |
552 | ||
115a60b1 PM |
553 | static int nf_tables_table_enable(const struct nft_af_info *afi, |
554 | struct nft_table *table) | |
9ddf6323 PNA |
555 | { |
556 | struct nft_chain *chain; | |
557 | int err, i = 0; | |
558 | ||
559 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
560 | if (!(chain->flags & NFT_BASE_CHAIN)) |
561 | continue; | |
562 | ||
115a60b1 | 563 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
564 | if (err < 0) |
565 | goto err; | |
566 | ||
567 | i++; | |
568 | } | |
569 | return 0; | |
570 | err: | |
571 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
572 | if (!(chain->flags & NFT_BASE_CHAIN)) |
573 | continue; | |
574 | ||
9ddf6323 PNA |
575 | if (i-- <= 0) |
576 | break; | |
577 | ||
115a60b1 | 578 | nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
579 | } |
580 | return err; | |
581 | } | |
582 | ||
f75edf5e | 583 | static void nf_tables_table_disable(const struct nft_af_info *afi, |
115a60b1 | 584 | struct nft_table *table) |
9ddf6323 PNA |
585 | { |
586 | struct nft_chain *chain; | |
587 | ||
d2012975 PNA |
588 | list_for_each_entry(chain, &table->chains, list) { |
589 | if (chain->flags & NFT_BASE_CHAIN) | |
115a60b1 PM |
590 | nf_unregister_hooks(nft_base_chain(chain)->ops, |
591 | afi->nops); | |
d2012975 | 592 | } |
9ddf6323 PNA |
593 | } |
594 | ||
e1aaca93 | 595 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 596 | { |
55dd6f93 | 597 | struct nft_trans *trans; |
e1aaca93 | 598 | u32 flags; |
55dd6f93 | 599 | int ret = 0; |
9ddf6323 | 600 | |
e1aaca93 PNA |
601 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
602 | return 0; | |
9ddf6323 | 603 | |
e1aaca93 PNA |
604 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
605 | if (flags & ~NFT_TABLE_F_DORMANT) | |
606 | return -EINVAL; | |
607 | ||
63283dd2 PNA |
608 | if (flags == ctx->table->flags) |
609 | return 0; | |
610 | ||
55dd6f93 PNA |
611 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
612 | sizeof(struct nft_trans_table)); | |
613 | if (trans == NULL) | |
614 | return -ENOMEM; | |
9ddf6323 | 615 | |
e1aaca93 PNA |
616 | if ((flags & NFT_TABLE_F_DORMANT) && |
617 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 618 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
619 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
620 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
621 | ret = nf_tables_table_enable(ctx->afi, ctx->table); | |
55dd6f93 | 622 | if (ret >= 0) { |
e1aaca93 | 623 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 624 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 625 | } |
9ddf6323 | 626 | } |
e1aaca93 PNA |
627 | if (ret < 0) |
628 | goto err; | |
9ddf6323 | 629 | |
55dd6f93 PNA |
630 | nft_trans_table_update(trans) = true; |
631 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
632 | return 0; | |
9ddf6323 | 633 | err: |
55dd6f93 | 634 | nft_trans_destroy(trans); |
9ddf6323 PNA |
635 | return ret; |
636 | } | |
637 | ||
96518518 PM |
638 | static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb, |
639 | const struct nlmsghdr *nlh, | |
640 | const struct nlattr * const nla[]) | |
641 | { | |
642 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
643 | const struct nlattr *name; | |
644 | struct nft_af_info *afi; | |
645 | struct nft_table *table; | |
99633ab2 | 646 | struct net *net = sock_net(skb->sk); |
96518518 | 647 | int family = nfmsg->nfgen_family; |
c5c1f975 | 648 | u32 flags = 0; |
e1aaca93 | 649 | struct nft_ctx ctx; |
55dd6f93 | 650 | int err; |
96518518 | 651 | |
99633ab2 | 652 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
653 | if (IS_ERR(afi)) |
654 | return PTR_ERR(afi); | |
655 | ||
656 | name = nla[NFTA_TABLE_NAME]; | |
9370761c | 657 | table = nf_tables_table_lookup(afi, name); |
96518518 PM |
658 | if (IS_ERR(table)) { |
659 | if (PTR_ERR(table) != -ENOENT) | |
660 | return PTR_ERR(table); | |
661 | table = NULL; | |
662 | } | |
663 | ||
664 | if (table != NULL) { | |
55dd6f93 PNA |
665 | if (table->flags & NFT_TABLE_INACTIVE) |
666 | return -ENOENT; | |
96518518 PM |
667 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
668 | return -EEXIST; | |
669 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
670 | return -EOPNOTSUPP; | |
e1aaca93 PNA |
671 | |
672 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); | |
673 | return nf_tables_updtable(&ctx); | |
96518518 PM |
674 | } |
675 | ||
c5c1f975 PM |
676 | if (nla[NFTA_TABLE_FLAGS]) { |
677 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
678 | if (flags & ~NFT_TABLE_F_DORMANT) | |
679 | return -EINVAL; | |
680 | } | |
681 | ||
7047f9d0 PM |
682 | if (!try_module_get(afi->owner)) |
683 | return -EAFNOSUPPORT; | |
684 | ||
ffdb210e | 685 | err = -ENOMEM; |
1cae565e | 686 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
ffdb210e PNA |
687 | if (table == NULL) |
688 | goto err1; | |
96518518 | 689 | |
1cae565e | 690 | nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN); |
96518518 | 691 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 692 | INIT_LIST_HEAD(&table->sets); |
c5c1f975 | 693 | table->flags = flags; |
9ddf6323 | 694 | |
55dd6f93 PNA |
695 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
696 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); | |
ffdb210e PNA |
697 | if (err < 0) |
698 | goto err2; | |
699 | ||
e688a7f8 | 700 | list_add_tail_rcu(&table->list, &afi->tables); |
96518518 | 701 | return 0; |
ffdb210e PNA |
702 | err2: |
703 | kfree(table); | |
704 | err1: | |
705 | module_put(afi->owner); | |
706 | return err; | |
96518518 PM |
707 | } |
708 | ||
b9ac12ef AB |
709 | static int nft_flush_table(struct nft_ctx *ctx) |
710 | { | |
711 | int err; | |
712 | struct nft_chain *chain, *nc; | |
713 | struct nft_set *set, *ns; | |
714 | ||
a2f18db0 | 715 | list_for_each_entry(chain, &ctx->table->chains, list) { |
b9ac12ef AB |
716 | ctx->chain = chain; |
717 | ||
718 | err = nft_delrule_by_chain(ctx); | |
719 | if (err < 0) | |
720 | goto out; | |
b9ac12ef AB |
721 | } |
722 | ||
723 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
724 | if (set->flags & NFT_SET_ANONYMOUS && | |
725 | !list_empty(&set->bindings)) | |
726 | continue; | |
727 | ||
728 | err = nft_delset(ctx, set); | |
729 | if (err < 0) | |
730 | goto out; | |
731 | } | |
732 | ||
a2f18db0 PNA |
733 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
734 | ctx->chain = chain; | |
735 | ||
736 | err = nft_delchain(ctx); | |
737 | if (err < 0) | |
738 | goto out; | |
739 | } | |
740 | ||
b9ac12ef AB |
741 | err = nft_deltable(ctx); |
742 | out: | |
743 | return err; | |
744 | } | |
745 | ||
746 | static int nft_flush(struct nft_ctx *ctx, int family) | |
747 | { | |
748 | struct nft_af_info *afi; | |
749 | struct nft_table *table, *nt; | |
750 | const struct nlattr * const *nla = ctx->nla; | |
751 | int err = 0; | |
752 | ||
753 | list_for_each_entry(afi, &ctx->net->nft.af_info, list) { | |
754 | if (family != AF_UNSPEC && afi->family != family) | |
755 | continue; | |
756 | ||
757 | ctx->afi = afi; | |
758 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
759 | if (nla[NFTA_TABLE_NAME] && | |
760 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
761 | continue; | |
762 | ||
763 | ctx->table = table; | |
764 | ||
765 | err = nft_flush_table(ctx); | |
766 | if (err < 0) | |
767 | goto out; | |
768 | } | |
769 | } | |
770 | out: | |
771 | return err; | |
772 | } | |
773 | ||
96518518 PM |
774 | static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb, |
775 | const struct nlmsghdr *nlh, | |
776 | const struct nlattr * const nla[]) | |
777 | { | |
778 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
779 | struct nft_af_info *afi; | |
780 | struct nft_table *table; | |
99633ab2 | 781 | struct net *net = sock_net(skb->sk); |
ee01d542 | 782 | int family = nfmsg->nfgen_family; |
55dd6f93 | 783 | struct nft_ctx ctx; |
96518518 | 784 | |
b9ac12ef AB |
785 | nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla); |
786 | if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL) | |
787 | return nft_flush(&ctx, family); | |
788 | ||
99633ab2 | 789 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
790 | if (IS_ERR(afi)) |
791 | return PTR_ERR(afi); | |
792 | ||
9370761c | 793 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
794 | if (IS_ERR(table)) |
795 | return PTR_ERR(table); | |
55dd6f93 PNA |
796 | if (table->flags & NFT_TABLE_INACTIVE) |
797 | return -ENOENT; | |
96518518 | 798 | |
b9ac12ef AB |
799 | ctx.afi = afi; |
800 | ctx.table = table; | |
55dd6f93 | 801 | |
b9ac12ef | 802 | return nft_flush_table(&ctx); |
96518518 PM |
803 | } |
804 | ||
55dd6f93 PNA |
805 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
806 | { | |
4fefee57 PNA |
807 | BUG_ON(ctx->table->use > 0); |
808 | ||
55dd6f93 PNA |
809 | kfree(ctx->table); |
810 | module_put(ctx->afi->owner); | |
811 | } | |
812 | ||
2a37d755 | 813 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 814 | { |
9370761c | 815 | int err = 0; |
96518518 PM |
816 | |
817 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
9370761c PNA |
818 | if (chain_type[ctype->family][ctype->type] != NULL) { |
819 | err = -EBUSY; | |
820 | goto out; | |
96518518 | 821 | } |
9370761c PNA |
822 | chain_type[ctype->family][ctype->type] = ctype; |
823 | out: | |
96518518 PM |
824 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
825 | return err; | |
826 | } | |
9370761c | 827 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 828 | |
2a37d755 | 829 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 830 | { |
96518518 | 831 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 832 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
833 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
834 | } | |
9370761c | 835 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
836 | |
837 | /* | |
838 | * Chains | |
839 | */ | |
840 | ||
841 | static struct nft_chain * | |
842 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) | |
843 | { | |
844 | struct nft_chain *chain; | |
845 | ||
846 | list_for_each_entry(chain, &table->chains, list) { | |
847 | if (chain->handle == handle) | |
848 | return chain; | |
849 | } | |
850 | ||
851 | return ERR_PTR(-ENOENT); | |
852 | } | |
853 | ||
854 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
855 | const struct nlattr *nla) | |
856 | { | |
857 | struct nft_chain *chain; | |
858 | ||
859 | if (nla == NULL) | |
860 | return ERR_PTR(-EINVAL); | |
861 | ||
862 | list_for_each_entry(chain, &table->chains, list) { | |
863 | if (!nla_strcmp(nla, chain->name)) | |
864 | return chain; | |
865 | } | |
866 | ||
867 | return ERR_PTR(-ENOENT); | |
868 | } | |
869 | ||
870 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
871 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, | |
872 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, | |
873 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
874 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
875 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 876 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 877 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 878 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
879 | }; |
880 | ||
881 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
882 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
883 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
884 | }; | |
885 | ||
0ca743a5 PNA |
886 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
887 | { | |
888 | struct nft_stats *cpu_stats, total; | |
889 | struct nlattr *nest; | |
ce355e20 ED |
890 | unsigned int seq; |
891 | u64 pkts, bytes; | |
0ca743a5 PNA |
892 | int cpu; |
893 | ||
894 | memset(&total, 0, sizeof(total)); | |
895 | for_each_possible_cpu(cpu) { | |
896 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
897 | do { |
898 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
899 | pkts = cpu_stats->pkts; | |
900 | bytes = cpu_stats->bytes; | |
901 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
902 | total.pkts += pkts; | |
903 | total.bytes += bytes; | |
0ca743a5 PNA |
904 | } |
905 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
906 | if (nest == NULL) | |
907 | goto nla_put_failure; | |
908 | ||
909 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) || | |
910 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes))) | |
911 | goto nla_put_failure; | |
912 | ||
913 | nla_nest_end(skb, nest); | |
914 | return 0; | |
915 | ||
916 | nla_put_failure: | |
917 | return -ENOSPC; | |
918 | } | |
919 | ||
84d7fce6 PNA |
920 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
921 | u32 portid, u32 seq, int event, u32 flags, | |
922 | int family, const struct nft_table *table, | |
96518518 PM |
923 | const struct nft_chain *chain) |
924 | { | |
925 | struct nlmsghdr *nlh; | |
926 | struct nfgenmsg *nfmsg; | |
927 | ||
928 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
929 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
930 | if (nlh == NULL) | |
931 | goto nla_put_failure; | |
932 | ||
933 | nfmsg = nlmsg_data(nlh); | |
934 | nfmsg->nfgen_family = family; | |
935 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 936 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
937 | |
938 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
939 | goto nla_put_failure; | |
940 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle))) | |
941 | goto nla_put_failure; | |
942 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
943 | goto nla_put_failure; | |
944 | ||
945 | if (chain->flags & NFT_BASE_CHAIN) { | |
0ca743a5 | 946 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 947 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
948 | struct nlattr *nest; |
949 | ||
950 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
951 | if (nest == NULL) |
952 | goto nla_put_failure; | |
953 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
954 | goto nla_put_failure; | |
955 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
956 | goto nla_put_failure; | |
957 | nla_nest_end(skb, nest); | |
9370761c | 958 | |
0ca743a5 PNA |
959 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
960 | htonl(basechain->policy))) | |
961 | goto nla_put_failure; | |
962 | ||
baae3e62 PM |
963 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
964 | goto nla_put_failure; | |
0ca743a5 PNA |
965 | |
966 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
967 | goto nla_put_failure; | |
96518518 PM |
968 | } |
969 | ||
0ca743a5 PNA |
970 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
971 | goto nla_put_failure; | |
972 | ||
053c095a JB |
973 | nlmsg_end(skb, nlh); |
974 | return 0; | |
96518518 PM |
975 | |
976 | nla_put_failure: | |
977 | nlmsg_trim(skb, nlh); | |
978 | return -1; | |
979 | } | |
980 | ||
35151d84 | 981 | static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
982 | { |
983 | struct sk_buff *skb; | |
96518518 PM |
984 | int err; |
985 | ||
128ad332 PNA |
986 | if (!ctx->report && |
987 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
988 | return 0; |
989 | ||
990 | err = -ENOBUFS; | |
991 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
992 | if (skb == NULL) | |
993 | goto err; | |
994 | ||
84d7fce6 PNA |
995 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
996 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 997 | ctx->chain); |
96518518 PM |
998 | if (err < 0) { |
999 | kfree_skb(skb); | |
1000 | goto err; | |
1001 | } | |
1002 | ||
128ad332 PNA |
1003 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1004 | ctx->report, GFP_KERNEL); | |
96518518 | 1005 | err: |
128ad332 PNA |
1006 | if (err < 0) { |
1007 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
1008 | err); | |
1009 | } | |
96518518 PM |
1010 | return err; |
1011 | } | |
1012 | ||
1013 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1014 | struct netlink_callback *cb) | |
1015 | { | |
1016 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1017 | const struct nft_af_info *afi; | |
1018 | const struct nft_table *table; | |
1019 | const struct nft_chain *chain; | |
1020 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1021 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1022 | int family = nfmsg->nfgen_family; |
1023 | ||
e688a7f8 | 1024 | rcu_read_lock(); |
38e029f1 PNA |
1025 | cb->seq = net->nft.base_seq; |
1026 | ||
e688a7f8 | 1027 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1028 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1029 | continue; | |
1030 | ||
e688a7f8 PNA |
1031 | list_for_each_entry_rcu(table, &afi->tables, list) { |
1032 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
96518518 PM |
1033 | if (idx < s_idx) |
1034 | goto cont; | |
1035 | if (idx > s_idx) | |
1036 | memset(&cb->args[1], 0, | |
1037 | sizeof(cb->args) - sizeof(cb->args[0])); | |
84d7fce6 PNA |
1038 | if (nf_tables_fill_chain_info(skb, net, |
1039 | NETLINK_CB(cb->skb).portid, | |
96518518 PM |
1040 | cb->nlh->nlmsg_seq, |
1041 | NFT_MSG_NEWCHAIN, | |
1042 | NLM_F_MULTI, | |
1043 | afi->family, table, chain) < 0) | |
1044 | goto done; | |
38e029f1 PNA |
1045 | |
1046 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
1047 | cont: |
1048 | idx++; | |
1049 | } | |
1050 | } | |
1051 | } | |
1052 | done: | |
e688a7f8 | 1053 | rcu_read_unlock(); |
96518518 PM |
1054 | cb->args[0] = idx; |
1055 | return skb->len; | |
1056 | } | |
1057 | ||
96518518 PM |
1058 | static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb, |
1059 | const struct nlmsghdr *nlh, | |
1060 | const struct nlattr * const nla[]) | |
1061 | { | |
1062 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1063 | const struct nft_af_info *afi; | |
1064 | const struct nft_table *table; | |
1065 | const struct nft_chain *chain; | |
1066 | struct sk_buff *skb2; | |
99633ab2 | 1067 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1068 | int family = nfmsg->nfgen_family; |
1069 | int err; | |
1070 | ||
1071 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1072 | struct netlink_dump_control c = { | |
1073 | .dump = nf_tables_dump_chains, | |
1074 | }; | |
1075 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1076 | } | |
1077 | ||
99633ab2 | 1078 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1079 | if (IS_ERR(afi)) |
1080 | return PTR_ERR(afi); | |
1081 | ||
9370761c | 1082 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
1083 | if (IS_ERR(table)) |
1084 | return PTR_ERR(table); | |
55dd6f93 PNA |
1085 | if (table->flags & NFT_TABLE_INACTIVE) |
1086 | return -ENOENT; | |
96518518 PM |
1087 | |
1088 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
1089 | if (IS_ERR(chain)) | |
1090 | return PTR_ERR(chain); | |
91c7b38d PNA |
1091 | if (chain->flags & NFT_CHAIN_INACTIVE) |
1092 | return -ENOENT; | |
96518518 PM |
1093 | |
1094 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1095 | if (!skb2) | |
1096 | return -ENOMEM; | |
1097 | ||
84d7fce6 | 1098 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1099 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1100 | family, table, chain); | |
1101 | if (err < 0) | |
1102 | goto err; | |
1103 | ||
1104 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1105 | ||
1106 | err: | |
1107 | kfree_skb(skb2); | |
1108 | return err; | |
1109 | } | |
1110 | ||
0ca743a5 PNA |
1111 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1112 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1113 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1114 | }; | |
1115 | ||
ff3cd7b3 | 1116 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1117 | { |
1118 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1119 | struct nft_stats __percpu *newstats; | |
1120 | struct nft_stats *stats; | |
1121 | int err; | |
1122 | ||
1123 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); | |
1124 | if (err < 0) | |
ff3cd7b3 | 1125 | return ERR_PTR(err); |
0ca743a5 PNA |
1126 | |
1127 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1128 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1129 | |
ce355e20 | 1130 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1131 | if (newstats == NULL) |
ff3cd7b3 | 1132 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1133 | |
1134 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1135 | * are not exposed to userspace. | |
1136 | */ | |
e8781f70 | 1137 | preempt_disable(); |
0ca743a5 PNA |
1138 | stats = this_cpu_ptr(newstats); |
1139 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1140 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1141 | preempt_enable(); |
0ca743a5 | 1142 | |
ff3cd7b3 PNA |
1143 | return newstats; |
1144 | } | |
1145 | ||
1146 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
1147 | struct nft_stats __percpu *newstats) | |
1148 | { | |
b88825de PNA |
1149 | if (newstats == NULL) |
1150 | return; | |
1151 | ||
0ca743a5 | 1152 | if (chain->stats) { |
0ca743a5 | 1153 | struct nft_stats __percpu *oldstats = |
67a8fc27 | 1154 | nft_dereference(chain->stats); |
0ca743a5 PNA |
1155 | |
1156 | rcu_assign_pointer(chain->stats, newstats); | |
1157 | synchronize_rcu(); | |
1158 | free_percpu(oldstats); | |
1159 | } else | |
1160 | rcu_assign_pointer(chain->stats, newstats); | |
0ca743a5 PNA |
1161 | } |
1162 | ||
91c7b38d PNA |
1163 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
1164 | { | |
1165 | BUG_ON(chain->use > 0); | |
1166 | ||
1167 | if (chain->flags & NFT_BASE_CHAIN) { | |
1168 | module_put(nft_base_chain(chain)->type->owner); | |
1169 | free_percpu(nft_base_chain(chain)->stats); | |
1170 | kfree(nft_base_chain(chain)); | |
1171 | } else { | |
1172 | kfree(chain); | |
1173 | } | |
1174 | } | |
1175 | ||
96518518 PM |
1176 | static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb, |
1177 | const struct nlmsghdr *nlh, | |
1178 | const struct nlattr * const nla[]) | |
1179 | { | |
1180 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1181 | const struct nlattr * uninitialized_var(name); | |
7c95f6d8 | 1182 | struct nft_af_info *afi; |
96518518 PM |
1183 | struct nft_table *table; |
1184 | struct nft_chain *chain; | |
0ca743a5 | 1185 | struct nft_base_chain *basechain = NULL; |
96518518 | 1186 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
99633ab2 | 1187 | struct net *net = sock_net(skb->sk); |
96518518 | 1188 | int family = nfmsg->nfgen_family; |
57de2a0c | 1189 | u8 policy = NF_ACCEPT; |
96518518 | 1190 | u64 handle = 0; |
115a60b1 | 1191 | unsigned int i; |
ff3cd7b3 | 1192 | struct nft_stats __percpu *stats; |
96518518 PM |
1193 | int err; |
1194 | bool create; | |
91c7b38d | 1195 | struct nft_ctx ctx; |
96518518 PM |
1196 | |
1197 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1198 | ||
99633ab2 | 1199 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
1200 | if (IS_ERR(afi)) |
1201 | return PTR_ERR(afi); | |
1202 | ||
9370761c | 1203 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
1204 | if (IS_ERR(table)) |
1205 | return PTR_ERR(table); | |
1206 | ||
96518518 PM |
1207 | chain = NULL; |
1208 | name = nla[NFTA_CHAIN_NAME]; | |
1209 | ||
1210 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1211 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
1212 | chain = nf_tables_chain_lookup_byhandle(table, handle); | |
1213 | if (IS_ERR(chain)) | |
1214 | return PTR_ERR(chain); | |
1215 | } else { | |
1216 | chain = nf_tables_chain_lookup(table, name); | |
1217 | if (IS_ERR(chain)) { | |
1218 | if (PTR_ERR(chain) != -ENOENT) | |
1219 | return PTR_ERR(chain); | |
1220 | chain = NULL; | |
1221 | } | |
1222 | } | |
1223 | ||
57de2a0c PM |
1224 | if (nla[NFTA_CHAIN_POLICY]) { |
1225 | if ((chain != NULL && | |
d6b6cb1d PNA |
1226 | !(chain->flags & NFT_BASE_CHAIN))) |
1227 | return -EOPNOTSUPP; | |
1228 | ||
1229 | if (chain == NULL && | |
57de2a0c PM |
1230 | nla[NFTA_CHAIN_HOOK] == NULL) |
1231 | return -EOPNOTSUPP; | |
1232 | ||
8f46df18 | 1233 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1234 | switch (policy) { |
1235 | case NF_DROP: | |
1236 | case NF_ACCEPT: | |
1237 | break; | |
1238 | default: | |
1239 | return -EINVAL; | |
1240 | } | |
1241 | } | |
1242 | ||
96518518 | 1243 | if (chain != NULL) { |
91c7b38d PNA |
1244 | struct nft_stats *stats = NULL; |
1245 | struct nft_trans *trans; | |
1246 | ||
1247 | if (chain->flags & NFT_CHAIN_INACTIVE) | |
1248 | return -ENOENT; | |
96518518 PM |
1249 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
1250 | return -EEXIST; | |
1251 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1252 | return -EOPNOTSUPP; | |
1253 | ||
1254 | if (nla[NFTA_CHAIN_HANDLE] && name && | |
1255 | !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) | |
1256 | return -EEXIST; | |
1257 | ||
0ca743a5 PNA |
1258 | if (nla[NFTA_CHAIN_COUNTERS]) { |
1259 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
1260 | return -EOPNOTSUPP; | |
1261 | ||
ff3cd7b3 PNA |
1262 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1263 | if (IS_ERR(stats)) | |
1264 | return PTR_ERR(stats); | |
0ca743a5 PNA |
1265 | } |
1266 | ||
91c7b38d PNA |
1267 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1268 | trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN, | |
1269 | sizeof(struct nft_trans_chain)); | |
f5553c19 PNA |
1270 | if (trans == NULL) { |
1271 | free_percpu(stats); | |
91c7b38d | 1272 | return -ENOMEM; |
f5553c19 | 1273 | } |
4401a862 | 1274 | |
91c7b38d PNA |
1275 | nft_trans_chain_stats(trans) = stats; |
1276 | nft_trans_chain_update(trans) = true; | |
4401a862 | 1277 | |
91c7b38d PNA |
1278 | if (nla[NFTA_CHAIN_POLICY]) |
1279 | nft_trans_chain_policy(trans) = policy; | |
1280 | else | |
1281 | nft_trans_chain_policy(trans) = -1; | |
96518518 | 1282 | |
91c7b38d PNA |
1283 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
1284 | nla_strlcpy(nft_trans_chain_name(trans), name, | |
1285 | NFT_CHAIN_MAXNAMELEN); | |
1286 | } | |
1287 | list_add_tail(&trans->list, &net->nft.commit_list); | |
1288 | return 0; | |
96518518 PM |
1289 | } |
1290 | ||
75820676 PM |
1291 | if (table->use == UINT_MAX) |
1292 | return -EOVERFLOW; | |
1293 | ||
96518518 | 1294 | if (nla[NFTA_CHAIN_HOOK]) { |
2a37d755 | 1295 | const struct nf_chain_type *type; |
96518518 | 1296 | struct nf_hook_ops *ops; |
9370761c | 1297 | nf_hookfn *hookfn; |
115a60b1 | 1298 | u32 hooknum, priority; |
9370761c | 1299 | |
baae3e62 | 1300 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
9370761c PNA |
1301 | if (nla[NFTA_CHAIN_TYPE]) { |
1302 | type = nf_tables_chain_type_lookup(afi, | |
1303 | nla[NFTA_CHAIN_TYPE], | |
1304 | create); | |
93b0806f PM |
1305 | if (IS_ERR(type)) |
1306 | return PTR_ERR(type); | |
9370761c | 1307 | } |
96518518 PM |
1308 | |
1309 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
1310 | nft_hook_policy); | |
1311 | if (err < 0) | |
1312 | return err; | |
1313 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1314 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1315 | return -EINVAL; | |
9370761c PNA |
1316 | |
1317 | hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
1318 | if (hooknum >= afi->nhooks) | |
96518518 | 1319 | return -EINVAL; |
115a60b1 | 1320 | priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
96518518 | 1321 | |
baae3e62 | 1322 | if (!(type->hook_mask & (1 << hooknum))) |
9370761c | 1323 | return -EOPNOTSUPP; |
fa2c1de0 | 1324 | if (!try_module_get(type->owner)) |
baae3e62 | 1325 | return -ENOENT; |
fa2c1de0 | 1326 | hookfn = type->hooks[hooknum]; |
9370761c | 1327 | |
96518518 | 1328 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
f5553c19 PNA |
1329 | if (basechain == NULL) { |
1330 | module_put(type->owner); | |
96518518 | 1331 | return -ENOMEM; |
f5553c19 | 1332 | } |
9370761c | 1333 | |
4401a862 | 1334 | if (nla[NFTA_CHAIN_COUNTERS]) { |
ff3cd7b3 PNA |
1335 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1336 | if (IS_ERR(stats)) { | |
fa2c1de0 | 1337 | module_put(type->owner); |
4401a862 | 1338 | kfree(basechain); |
ff3cd7b3 | 1339 | return PTR_ERR(stats); |
4401a862 | 1340 | } |
ff3cd7b3 | 1341 | basechain->stats = stats; |
4401a862 | 1342 | } else { |
ce355e20 | 1343 | stats = netdev_alloc_pcpu_stats(struct nft_stats); |
c123bb71 | 1344 | if (stats == NULL) { |
fa2c1de0 | 1345 | module_put(type->owner); |
4401a862 | 1346 | kfree(basechain); |
c123bb71 | 1347 | return -ENOMEM; |
4401a862 | 1348 | } |
ff3cd7b3 | 1349 | rcu_assign_pointer(basechain->stats, stats); |
4401a862 PM |
1350 | } |
1351 | ||
5ebb335d | 1352 | write_pnet(&basechain->pnet, net); |
9370761c | 1353 | basechain->type = type; |
96518518 PM |
1354 | chain = &basechain->chain; |
1355 | ||
115a60b1 PM |
1356 | for (i = 0; i < afi->nops; i++) { |
1357 | ops = &basechain->ops[i]; | |
1358 | ops->pf = family; | |
1359 | ops->owner = afi->owner; | |
1360 | ops->hooknum = hooknum; | |
1361 | ops->priority = priority; | |
1362 | ops->priv = chain; | |
1363 | ops->hook = afi->hooks[ops->hooknum]; | |
1364 | if (hookfn) | |
1365 | ops->hook = hookfn; | |
1366 | if (afi->hook_ops_init) | |
1367 | afi->hook_ops_init(ops, i); | |
1368 | } | |
96518518 PM |
1369 | |
1370 | chain->flags |= NFT_BASE_CHAIN; | |
57de2a0c | 1371 | basechain->policy = policy; |
96518518 PM |
1372 | } else { |
1373 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1374 | if (chain == NULL) | |
1375 | return -ENOMEM; | |
1376 | } | |
1377 | ||
1378 | INIT_LIST_HEAD(&chain->rules); | |
1379 | chain->handle = nf_tables_alloc_handle(table); | |
b5bc89bf | 1380 | chain->table = table; |
96518518 PM |
1381 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
1382 | ||
9ddf6323 PNA |
1383 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
1384 | chain->flags & NFT_BASE_CHAIN) { | |
115a60b1 | 1385 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
91c7b38d PNA |
1386 | if (err < 0) |
1387 | goto err1; | |
0ca743a5 | 1388 | } |
96518518 | 1389 | |
91c7b38d PNA |
1390 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1391 | err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN); | |
1392 | if (err < 0) | |
1393 | goto err2; | |
96518518 | 1394 | |
4fefee57 | 1395 | table->use++; |
e688a7f8 | 1396 | list_add_tail_rcu(&chain->list, &table->chains); |
91c7b38d PNA |
1397 | return 0; |
1398 | err2: | |
c5598794 | 1399 | nf_tables_unregister_hooks(table, chain, afi->nops); |
91c7b38d PNA |
1400 | err1: |
1401 | nf_tables_chain_destroy(chain); | |
1402 | return err; | |
96518518 PM |
1403 | } |
1404 | ||
1405 | static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb, | |
1406 | const struct nlmsghdr *nlh, | |
1407 | const struct nlattr * const nla[]) | |
1408 | { | |
1409 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 | 1410 | struct nft_af_info *afi; |
96518518 PM |
1411 | struct nft_table *table; |
1412 | struct nft_chain *chain; | |
99633ab2 | 1413 | struct net *net = sock_net(skb->sk); |
96518518 | 1414 | int family = nfmsg->nfgen_family; |
91c7b38d | 1415 | struct nft_ctx ctx; |
96518518 | 1416 | |
99633ab2 | 1417 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1418 | if (IS_ERR(afi)) |
1419 | return PTR_ERR(afi); | |
1420 | ||
9370761c | 1421 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
1422 | if (IS_ERR(table)) |
1423 | return PTR_ERR(table); | |
55dd6f93 PNA |
1424 | if (table->flags & NFT_TABLE_INACTIVE) |
1425 | return -ENOENT; | |
96518518 PM |
1426 | |
1427 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
1428 | if (IS_ERR(chain)) | |
1429 | return PTR_ERR(chain); | |
91c7b38d PNA |
1430 | if (chain->flags & NFT_CHAIN_INACTIVE) |
1431 | return -ENOENT; | |
4fefee57 | 1432 | if (chain->use > 0) |
96518518 PM |
1433 | return -EBUSY; |
1434 | ||
91c7b38d | 1435 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
0165d932 | 1436 | |
ee01d542 | 1437 | return nft_delchain(&ctx); |
96518518 PM |
1438 | } |
1439 | ||
96518518 PM |
1440 | /* |
1441 | * Expressions | |
1442 | */ | |
1443 | ||
1444 | /** | |
ef1f7df9 PM |
1445 | * nft_register_expr - register nf_tables expr type |
1446 | * @ops: expr type | |
96518518 | 1447 | * |
ef1f7df9 | 1448 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1449 | * success or a negative errno code otherwise. |
1450 | */ | |
ef1f7df9 | 1451 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1452 | { |
1453 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1454 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1455 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1456 | else |
e688a7f8 | 1457 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1458 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1459 | return 0; | |
1460 | } | |
1461 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1462 | ||
1463 | /** | |
ef1f7df9 PM |
1464 | * nft_unregister_expr - unregister nf_tables expr type |
1465 | * @ops: expr type | |
96518518 | 1466 | * |
ef1f7df9 | 1467 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1468 | */ |
ef1f7df9 | 1469 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1470 | { |
1471 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1472 | list_del_rcu(&type->list); |
96518518 PM |
1473 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1474 | } | |
1475 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1476 | ||
64d46806 PM |
1477 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1478 | struct nlattr *nla) | |
96518518 | 1479 | { |
ef1f7df9 | 1480 | const struct nft_expr_type *type; |
96518518 | 1481 | |
ef1f7df9 | 1482 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1483 | if (!nla_strcmp(nla, type->name) && |
1484 | (!type->family || type->family == family)) | |
ef1f7df9 | 1485 | return type; |
96518518 PM |
1486 | } |
1487 | return NULL; | |
1488 | } | |
1489 | ||
64d46806 PM |
1490 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1491 | struct nlattr *nla) | |
96518518 | 1492 | { |
ef1f7df9 | 1493 | const struct nft_expr_type *type; |
96518518 PM |
1494 | |
1495 | if (nla == NULL) | |
1496 | return ERR_PTR(-EINVAL); | |
1497 | ||
64d46806 | 1498 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1499 | if (type != NULL && try_module_get(type->owner)) |
1500 | return type; | |
96518518 PM |
1501 | |
1502 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1503 | if (type == NULL) { |
64d46806 PM |
1504 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1505 | request_module("nft-expr-%u-%.*s", family, | |
1506 | nla_len(nla), (char *)nla_data(nla)); | |
1507 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1508 | if (__nft_expr_type_get(family, nla)) | |
1509 | return ERR_PTR(-EAGAIN); | |
1510 | ||
96518518 PM |
1511 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1512 | request_module("nft-expr-%.*s", | |
1513 | nla_len(nla), (char *)nla_data(nla)); | |
1514 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1515 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1516 | return ERR_PTR(-EAGAIN); |
1517 | } | |
1518 | #endif | |
1519 | return ERR_PTR(-ENOENT); | |
1520 | } | |
1521 | ||
1522 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1523 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1524 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1525 | }; | |
1526 | ||
1527 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1528 | const struct nft_expr *expr) | |
1529 | { | |
ef1f7df9 | 1530 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1531 | goto nla_put_failure; |
1532 | ||
1533 | if (expr->ops->dump) { | |
1534 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1535 | if (data == NULL) | |
1536 | goto nla_put_failure; | |
1537 | if (expr->ops->dump(skb, expr) < 0) | |
1538 | goto nla_put_failure; | |
1539 | nla_nest_end(skb, data); | |
1540 | } | |
1541 | ||
1542 | return skb->len; | |
1543 | ||
1544 | nla_put_failure: | |
1545 | return -1; | |
1546 | }; | |
1547 | ||
0b2d8a7b PM |
1548 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
1549 | const struct nft_expr *expr) | |
1550 | { | |
1551 | struct nlattr *nest; | |
1552 | ||
1553 | nest = nla_nest_start(skb, attr); | |
1554 | if (!nest) | |
1555 | goto nla_put_failure; | |
1556 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1557 | goto nla_put_failure; | |
1558 | nla_nest_end(skb, nest); | |
1559 | return 0; | |
1560 | ||
1561 | nla_put_failure: | |
1562 | return -1; | |
1563 | } | |
1564 | ||
96518518 PM |
1565 | struct nft_expr_info { |
1566 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1567 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1568 | }; |
1569 | ||
0ca743a5 PNA |
1570 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1571 | const struct nlattr *nla, | |
96518518 PM |
1572 | struct nft_expr_info *info) |
1573 | { | |
ef1f7df9 | 1574 | const struct nft_expr_type *type; |
96518518 | 1575 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1576 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1577 | int err; |
1578 | ||
ef1f7df9 | 1579 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
96518518 PM |
1580 | if (err < 0) |
1581 | return err; | |
1582 | ||
64d46806 | 1583 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1584 | if (IS_ERR(type)) |
1585 | return PTR_ERR(type); | |
1586 | ||
1587 | if (tb[NFTA_EXPR_DATA]) { | |
1588 | err = nla_parse_nested(info->tb, type->maxattr, | |
1589 | tb[NFTA_EXPR_DATA], type->policy); | |
1590 | if (err < 0) | |
1591 | goto err1; | |
1592 | } else | |
1593 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1594 | ||
1595 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1596 | ops = type->select_ops(ctx, |
1597 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1598 | if (IS_ERR(ops)) { |
1599 | err = PTR_ERR(ops); | |
1600 | goto err1; | |
1601 | } | |
1602 | } else | |
1603 | ops = type->ops; | |
1604 | ||
96518518 PM |
1605 | info->ops = ops; |
1606 | return 0; | |
ef1f7df9 PM |
1607 | |
1608 | err1: | |
1609 | module_put(type->owner); | |
1610 | return err; | |
96518518 PM |
1611 | } |
1612 | ||
1613 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1614 | const struct nft_expr_info *info, |
96518518 PM |
1615 | struct nft_expr *expr) |
1616 | { | |
1617 | const struct nft_expr_ops *ops = info->ops; | |
1618 | int err; | |
1619 | ||
1620 | expr->ops = ops; | |
1621 | if (ops->init) { | |
ef1f7df9 | 1622 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1623 | if (err < 0) |
1624 | goto err1; | |
1625 | } | |
1626 | ||
96518518 PM |
1627 | return 0; |
1628 | ||
1629 | err1: | |
1630 | expr->ops = NULL; | |
1631 | return err; | |
1632 | } | |
1633 | ||
62472bce PM |
1634 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1635 | struct nft_expr *expr) | |
96518518 PM |
1636 | { |
1637 | if (expr->ops->destroy) | |
62472bce | 1638 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1639 | module_put(expr->ops->type->owner); |
96518518 PM |
1640 | } |
1641 | ||
0b2d8a7b PM |
1642 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
1643 | const struct nlattr *nla) | |
1644 | { | |
1645 | struct nft_expr_info info; | |
1646 | struct nft_expr *expr; | |
1647 | int err; | |
1648 | ||
1649 | err = nf_tables_expr_parse(ctx, nla, &info); | |
1650 | if (err < 0) | |
1651 | goto err1; | |
1652 | ||
1653 | err = -ENOMEM; | |
1654 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
1655 | if (expr == NULL) | |
1656 | goto err2; | |
1657 | ||
1658 | err = nf_tables_newexpr(ctx, &info, expr); | |
1659 | if (err < 0) | |
1660 | goto err2; | |
1661 | ||
1662 | return expr; | |
1663 | err2: | |
1664 | module_put(info.ops->type->owner); | |
1665 | err1: | |
1666 | return ERR_PTR(err); | |
1667 | } | |
1668 | ||
1669 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
1670 | { | |
1671 | nf_tables_expr_destroy(ctx, expr); | |
1672 | kfree(expr); | |
1673 | } | |
1674 | ||
96518518 PM |
1675 | /* |
1676 | * Rules | |
1677 | */ | |
1678 | ||
1679 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1680 | u64 handle) | |
1681 | { | |
1682 | struct nft_rule *rule; | |
1683 | ||
1684 | // FIXME: this sucks | |
1685 | list_for_each_entry(rule, &chain->rules, list) { | |
1686 | if (handle == rule->handle) | |
1687 | return rule; | |
1688 | } | |
1689 | ||
1690 | return ERR_PTR(-ENOENT); | |
1691 | } | |
1692 | ||
1693 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1694 | const struct nlattr *nla) | |
1695 | { | |
1696 | if (nla == NULL) | |
1697 | return ERR_PTR(-EINVAL); | |
1698 | ||
1699 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1700 | } | |
1701 | ||
1702 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
1703 | [NFTA_RULE_TABLE] = { .type = NLA_STRING }, | |
1704 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, | |
1705 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1706 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1707 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1708 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1709 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1710 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1711 | .len = NFT_USERDATA_MAXLEN }, | |
96518518 PM |
1712 | }; |
1713 | ||
84d7fce6 PNA |
1714 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
1715 | u32 portid, u32 seq, int event, | |
1716 | u32 flags, int family, | |
96518518 PM |
1717 | const struct nft_table *table, |
1718 | const struct nft_chain *chain, | |
1719 | const struct nft_rule *rule) | |
1720 | { | |
1721 | struct nlmsghdr *nlh; | |
1722 | struct nfgenmsg *nfmsg; | |
1723 | const struct nft_expr *expr, *next; | |
1724 | struct nlattr *list; | |
5e948466 EL |
1725 | const struct nft_rule *prule; |
1726 | int type = event | NFNL_SUBSYS_NFTABLES << 8; | |
96518518 | 1727 | |
5e948466 | 1728 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
96518518 PM |
1729 | flags); |
1730 | if (nlh == NULL) | |
1731 | goto nla_put_failure; | |
1732 | ||
1733 | nfmsg = nlmsg_data(nlh); | |
1734 | nfmsg->nfgen_family = family; | |
1735 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1736 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1737 | |
1738 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1739 | goto nla_put_failure; | |
1740 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1741 | goto nla_put_failure; | |
1742 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle))) | |
1743 | goto nla_put_failure; | |
1744 | ||
5e948466 EL |
1745 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
1746 | prule = list_entry(rule->list.prev, struct nft_rule, list); | |
1747 | if (nla_put_be64(skb, NFTA_RULE_POSITION, | |
1748 | cpu_to_be64(prule->handle))) | |
1749 | goto nla_put_failure; | |
1750 | } | |
1751 | ||
96518518 PM |
1752 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
1753 | if (list == NULL) | |
1754 | goto nla_put_failure; | |
1755 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 1756 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 1757 | goto nla_put_failure; |
96518518 PM |
1758 | } |
1759 | nla_nest_end(skb, list); | |
1760 | ||
86f1ec32 PM |
1761 | if (rule->udata) { |
1762 | struct nft_userdata *udata = nft_userdata(rule); | |
1763 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
1764 | udata->data) < 0) | |
1765 | goto nla_put_failure; | |
1766 | } | |
0768b3b3 | 1767 | |
053c095a JB |
1768 | nlmsg_end(skb, nlh); |
1769 | return 0; | |
96518518 PM |
1770 | |
1771 | nla_put_failure: | |
1772 | nlmsg_trim(skb, nlh); | |
1773 | return -1; | |
1774 | } | |
1775 | ||
35151d84 | 1776 | static int nf_tables_rule_notify(const struct nft_ctx *ctx, |
96518518 | 1777 | const struct nft_rule *rule, |
35151d84 | 1778 | int event) |
96518518 PM |
1779 | { |
1780 | struct sk_buff *skb; | |
96518518 PM |
1781 | int err; |
1782 | ||
128ad332 PNA |
1783 | if (!ctx->report && |
1784 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
1785 | return 0; |
1786 | ||
1787 | err = -ENOBUFS; | |
1788 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1789 | if (skb == NULL) | |
1790 | goto err; | |
1791 | ||
84d7fce6 PNA |
1792 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
1793 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1794 | ctx->chain, rule); |
96518518 PM |
1795 | if (err < 0) { |
1796 | kfree_skb(skb); | |
1797 | goto err; | |
1798 | } | |
1799 | ||
128ad332 PNA |
1800 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1801 | ctx->report, GFP_KERNEL); | |
96518518 | 1802 | err: |
128ad332 PNA |
1803 | if (err < 0) { |
1804 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
1805 | err); | |
1806 | } | |
96518518 PM |
1807 | return err; |
1808 | } | |
1809 | ||
1810 | static int nf_tables_dump_rules(struct sk_buff *skb, | |
1811 | struct netlink_callback *cb) | |
1812 | { | |
1813 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1814 | const struct nft_af_info *afi; | |
1815 | const struct nft_table *table; | |
1816 | const struct nft_chain *chain; | |
1817 | const struct nft_rule *rule; | |
1818 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1819 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1820 | int family = nfmsg->nfgen_family; |
1821 | ||
e688a7f8 | 1822 | rcu_read_lock(); |
38e029f1 PNA |
1823 | cb->seq = net->nft.base_seq; |
1824 | ||
e688a7f8 | 1825 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1826 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1827 | continue; | |
1828 | ||
e688a7f8 PNA |
1829 | list_for_each_entry_rcu(table, &afi->tables, list) { |
1830 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
1831 | list_for_each_entry_rcu(rule, &chain->rules, list) { | |
0628b123 PNA |
1832 | if (!nft_rule_is_active(net, rule)) |
1833 | goto cont; | |
96518518 PM |
1834 | if (idx < s_idx) |
1835 | goto cont; | |
1836 | if (idx > s_idx) | |
1837 | memset(&cb->args[1], 0, | |
1838 | sizeof(cb->args) - sizeof(cb->args[0])); | |
84d7fce6 | 1839 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, |
96518518 PM |
1840 | cb->nlh->nlmsg_seq, |
1841 | NFT_MSG_NEWRULE, | |
1842 | NLM_F_MULTI | NLM_F_APPEND, | |
1843 | afi->family, table, chain, rule) < 0) | |
1844 | goto done; | |
38e029f1 PNA |
1845 | |
1846 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
1847 | cont: |
1848 | idx++; | |
1849 | } | |
1850 | } | |
1851 | } | |
1852 | } | |
1853 | done: | |
e688a7f8 PNA |
1854 | rcu_read_unlock(); |
1855 | ||
96518518 PM |
1856 | cb->args[0] = idx; |
1857 | return skb->len; | |
1858 | } | |
1859 | ||
1860 | static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb, | |
1861 | const struct nlmsghdr *nlh, | |
1862 | const struct nlattr * const nla[]) | |
1863 | { | |
1864 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1865 | const struct nft_af_info *afi; | |
1866 | const struct nft_table *table; | |
1867 | const struct nft_chain *chain; | |
1868 | const struct nft_rule *rule; | |
1869 | struct sk_buff *skb2; | |
99633ab2 | 1870 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1871 | int family = nfmsg->nfgen_family; |
1872 | int err; | |
1873 | ||
1874 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1875 | struct netlink_dump_control c = { | |
1876 | .dump = nf_tables_dump_rules, | |
1877 | }; | |
1878 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1879 | } | |
1880 | ||
99633ab2 | 1881 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1882 | if (IS_ERR(afi)) |
1883 | return PTR_ERR(afi); | |
1884 | ||
9370761c | 1885 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1886 | if (IS_ERR(table)) |
1887 | return PTR_ERR(table); | |
55dd6f93 PNA |
1888 | if (table->flags & NFT_TABLE_INACTIVE) |
1889 | return -ENOENT; | |
96518518 PM |
1890 | |
1891 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1892 | if (IS_ERR(chain)) | |
1893 | return PTR_ERR(chain); | |
91c7b38d PNA |
1894 | if (chain->flags & NFT_CHAIN_INACTIVE) |
1895 | return -ENOENT; | |
96518518 PM |
1896 | |
1897 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
1898 | if (IS_ERR(rule)) | |
1899 | return PTR_ERR(rule); | |
1900 | ||
1901 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1902 | if (!skb2) | |
1903 | return -ENOMEM; | |
1904 | ||
84d7fce6 | 1905 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1906 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
1907 | family, table, chain, rule); | |
1908 | if (err < 0) | |
1909 | goto err; | |
1910 | ||
1911 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1912 | ||
1913 | err: | |
1914 | kfree_skb(skb2); | |
1915 | return err; | |
1916 | } | |
1917 | ||
62472bce PM |
1918 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
1919 | struct nft_rule *rule) | |
96518518 | 1920 | { |
96518518 PM |
1921 | struct nft_expr *expr; |
1922 | ||
1923 | /* | |
1924 | * Careful: some expressions might not be initialized in case this | |
1925 | * is called on error from nf_tables_newrule(). | |
1926 | */ | |
1927 | expr = nft_expr_first(rule); | |
1928 | while (expr->ops && expr != nft_expr_last(rule)) { | |
62472bce | 1929 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
1930 | expr = nft_expr_next(expr); |
1931 | } | |
1932 | kfree(rule); | |
1933 | } | |
1934 | ||
1081d11b PNA |
1935 | #define NFT_RULE_MAXEXPRS 128 |
1936 | ||
1937 | static struct nft_expr_info *info; | |
1938 | ||
96518518 PM |
1939 | static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, |
1940 | const struct nlmsghdr *nlh, | |
1941 | const struct nlattr * const nla[]) | |
1942 | { | |
1943 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 | 1944 | struct nft_af_info *afi; |
99633ab2 | 1945 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1946 | struct nft_table *table; |
1947 | struct nft_chain *chain; | |
1948 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 1949 | struct nft_userdata *udata; |
1081d11b | 1950 | struct nft_trans *trans = NULL; |
96518518 PM |
1951 | struct nft_expr *expr; |
1952 | struct nft_ctx ctx; | |
1953 | struct nlattr *tmp; | |
86f1ec32 | 1954 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 PM |
1955 | int err, rem; |
1956 | bool create; | |
5e948466 | 1957 | u64 handle, pos_handle; |
96518518 PM |
1958 | |
1959 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1960 | ||
99633ab2 | 1961 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
1962 | if (IS_ERR(afi)) |
1963 | return PTR_ERR(afi); | |
1964 | ||
9370761c | 1965 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1966 | if (IS_ERR(table)) |
1967 | return PTR_ERR(table); | |
1968 | ||
1969 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1970 | if (IS_ERR(chain)) | |
1971 | return PTR_ERR(chain); | |
1972 | ||
1973 | if (nla[NFTA_RULE_HANDLE]) { | |
1974 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
1975 | rule = __nf_tables_rule_lookup(chain, handle); | |
1976 | if (IS_ERR(rule)) | |
1977 | return PTR_ERR(rule); | |
1978 | ||
1979 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1980 | return -EEXIST; | |
1981 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1982 | old_rule = rule; | |
1983 | else | |
1984 | return -EOPNOTSUPP; | |
1985 | } else { | |
1986 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
1987 | return -EINVAL; | |
1988 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
1989 | |
1990 | if (chain->use == UINT_MAX) | |
1991 | return -EOVERFLOW; | |
96518518 PM |
1992 | } |
1993 | ||
5e948466 EL |
1994 | if (nla[NFTA_RULE_POSITION]) { |
1995 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
1996 | return -EOPNOTSUPP; | |
1997 | ||
1998 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
1999 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
2000 | if (IS_ERR(old_rule)) | |
2001 | return PTR_ERR(old_rule); | |
2002 | } | |
2003 | ||
0ca743a5 PNA |
2004 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
2005 | ||
96518518 PM |
2006 | n = 0; |
2007 | size = 0; | |
2008 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2009 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
2010 | err = -EINVAL; | |
2011 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2012 | goto err1; | |
2013 | if (n == NFT_RULE_MAXEXPRS) | |
2014 | goto err1; | |
0ca743a5 | 2015 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2016 | if (err < 0) |
2017 | goto err1; | |
2018 | size += info[n].ops->size; | |
2019 | n++; | |
2020 | } | |
2021 | } | |
9889840f PM |
2022 | /* Check for overflow of dlen field */ |
2023 | err = -EFBIG; | |
2024 | if (size >= 1 << 12) | |
2025 | goto err1; | |
96518518 | 2026 | |
86f1ec32 | 2027 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2028 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2029 | if (ulen > 0) |
2030 | usize = sizeof(struct nft_userdata) + ulen; | |
2031 | } | |
0768b3b3 | 2032 | |
96518518 | 2033 | err = -ENOMEM; |
86f1ec32 | 2034 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2035 | if (rule == NULL) |
2036 | goto err1; | |
2037 | ||
0628b123 PNA |
2038 | nft_rule_activate_next(net, rule); |
2039 | ||
96518518 PM |
2040 | rule->handle = handle; |
2041 | rule->dlen = size; | |
86f1ec32 | 2042 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2043 | |
86f1ec32 PM |
2044 | if (ulen) { |
2045 | udata = nft_userdata(rule); | |
2046 | udata->len = ulen - 1; | |
2047 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2048 | } | |
96518518 | 2049 | |
96518518 PM |
2050 | expr = nft_expr_first(rule); |
2051 | for (i = 0; i < n; i++) { | |
2052 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2053 | if (err < 0) | |
2054 | goto err2; | |
ef1f7df9 | 2055 | info[i].ops = NULL; |
96518518 PM |
2056 | expr = nft_expr_next(expr); |
2057 | } | |
2058 | ||
96518518 | 2059 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
0628b123 | 2060 | if (nft_rule_is_active_next(net, old_rule)) { |
ac904ac8 | 2061 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
b380e5c7 | 2062 | old_rule); |
1081d11b | 2063 | if (trans == NULL) { |
0628b123 PNA |
2064 | err = -ENOMEM; |
2065 | goto err2; | |
2066 | } | |
ee01d542 | 2067 | nft_rule_deactivate_next(net, old_rule); |
ac34b861 | 2068 | chain->use--; |
5bc5c307 | 2069 | list_add_tail_rcu(&rule->list, &old_rule->list); |
0628b123 PNA |
2070 | } else { |
2071 | err = -ENOENT; | |
2072 | goto err2; | |
2073 | } | |
96518518 | 2074 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
2075 | if (old_rule) |
2076 | list_add_rcu(&rule->list, &old_rule->list); | |
2077 | else | |
2078 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2079 | else { | |
2080 | if (old_rule) | |
2081 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2082 | else | |
2083 | list_add_rcu(&rule->list, &chain->rules); | |
2084 | } | |
96518518 | 2085 | |
b380e5c7 | 2086 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
0628b123 PNA |
2087 | err = -ENOMEM; |
2088 | goto err3; | |
2089 | } | |
4fefee57 | 2090 | chain->use++; |
96518518 PM |
2091 | return 0; |
2092 | ||
0628b123 PNA |
2093 | err3: |
2094 | list_del_rcu(&rule->list); | |
96518518 | 2095 | err2: |
62472bce | 2096 | nf_tables_rule_destroy(&ctx, rule); |
96518518 PM |
2097 | err1: |
2098 | for (i = 0; i < n; i++) { | |
2099 | if (info[i].ops != NULL) | |
ef1f7df9 | 2100 | module_put(info[i].ops->type->owner); |
96518518 PM |
2101 | } |
2102 | return err; | |
2103 | } | |
2104 | ||
2105 | static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb, | |
2106 | const struct nlmsghdr *nlh, | |
2107 | const struct nlattr * const nla[]) | |
2108 | { | |
2109 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 | 2110 | struct nft_af_info *afi; |
99633ab2 | 2111 | struct net *net = sock_net(skb->sk); |
7c95f6d8 | 2112 | struct nft_table *table; |
cf9dc09d PNA |
2113 | struct nft_chain *chain = NULL; |
2114 | struct nft_rule *rule; | |
0628b123 PNA |
2115 | int family = nfmsg->nfgen_family, err = 0; |
2116 | struct nft_ctx ctx; | |
96518518 | 2117 | |
99633ab2 | 2118 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2119 | if (IS_ERR(afi)) |
2120 | return PTR_ERR(afi); | |
2121 | ||
9370761c | 2122 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
2123 | if (IS_ERR(table)) |
2124 | return PTR_ERR(table); | |
55dd6f93 PNA |
2125 | if (table->flags & NFT_TABLE_INACTIVE) |
2126 | return -ENOENT; | |
96518518 | 2127 | |
cf9dc09d PNA |
2128 | if (nla[NFTA_RULE_CHAIN]) { |
2129 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
2130 | if (IS_ERR(chain)) | |
2131 | return PTR_ERR(chain); | |
2132 | } | |
96518518 | 2133 | |
0628b123 PNA |
2134 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
2135 | ||
cf9dc09d PNA |
2136 | if (chain) { |
2137 | if (nla[NFTA_RULE_HANDLE]) { | |
2138 | rule = nf_tables_rule_lookup(chain, | |
2139 | nla[NFTA_RULE_HANDLE]); | |
2140 | if (IS_ERR(rule)) | |
2141 | return PTR_ERR(rule); | |
96518518 | 2142 | |
5e266fe7 | 2143 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2144 | } else { |
ce24b721 | 2145 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2146 | } |
2147 | } else { | |
2148 | list_for_each_entry(chain, &table->chains, list) { | |
2149 | ctx.chain = chain; | |
ce24b721 | 2150 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2151 | if (err < 0) |
2152 | break; | |
2153 | } | |
2154 | } | |
2155 | ||
2156 | return err; | |
2157 | } | |
2158 | ||
20a69341 PM |
2159 | /* |
2160 | * Sets | |
2161 | */ | |
2162 | ||
2163 | static LIST_HEAD(nf_tables_set_ops); | |
2164 | ||
2165 | int nft_register_set(struct nft_set_ops *ops) | |
2166 | { | |
2167 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 2168 | list_add_tail_rcu(&ops->list, &nf_tables_set_ops); |
20a69341 PM |
2169 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2170 | return 0; | |
2171 | } | |
2172 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2173 | ||
2174 | void nft_unregister_set(struct nft_set_ops *ops) | |
2175 | { | |
2176 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 2177 | list_del_rcu(&ops->list); |
20a69341 PM |
2178 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2179 | } | |
2180 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2181 | ||
c50b960c PM |
2182 | /* |
2183 | * Select a set implementation based on the data characteristics and the | |
2184 | * given policy. The total memory use might not be known if no size is | |
2185 | * given, in that case the amount of memory per element is used. | |
2186 | */ | |
2187 | static const struct nft_set_ops * | |
2188 | nft_select_set_ops(const struct nlattr * const nla[], | |
2189 | const struct nft_set_desc *desc, | |
2190 | enum nft_set_policies policy) | |
20a69341 | 2191 | { |
c50b960c PM |
2192 | const struct nft_set_ops *ops, *bops; |
2193 | struct nft_set_estimate est, best; | |
20a69341 PM |
2194 | u32 features; |
2195 | ||
2196 | #ifdef CONFIG_MODULES | |
2197 | if (list_empty(&nf_tables_set_ops)) { | |
2198 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
2199 | request_module("nft-set"); | |
2200 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2201 | if (!list_empty(&nf_tables_set_ops)) | |
2202 | return ERR_PTR(-EAGAIN); | |
2203 | } | |
2204 | #endif | |
2205 | features = 0; | |
2206 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2207 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
4a8678ef | 2208 | features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT; |
20a69341 PM |
2209 | } |
2210 | ||
c50b960c PM |
2211 | bops = NULL; |
2212 | best.size = ~0; | |
2213 | best.class = ~0; | |
2214 | ||
20a69341 PM |
2215 | list_for_each_entry(ops, &nf_tables_set_ops, list) { |
2216 | if ((ops->features & features) != features) | |
2217 | continue; | |
c50b960c PM |
2218 | if (!ops->estimate(desc, features, &est)) |
2219 | continue; | |
2220 | ||
2221 | switch (policy) { | |
2222 | case NFT_SET_POL_PERFORMANCE: | |
2223 | if (est.class < best.class) | |
2224 | break; | |
2225 | if (est.class == best.class && est.size < best.size) | |
2226 | break; | |
2227 | continue; | |
2228 | case NFT_SET_POL_MEMORY: | |
2229 | if (est.size < best.size) | |
2230 | break; | |
2231 | if (est.size == best.size && est.class < best.class) | |
2232 | break; | |
2233 | continue; | |
2234 | default: | |
2235 | break; | |
2236 | } | |
2237 | ||
20a69341 PM |
2238 | if (!try_module_get(ops->owner)) |
2239 | continue; | |
c50b960c PM |
2240 | if (bops != NULL) |
2241 | module_put(bops->owner); | |
2242 | ||
2243 | bops = ops; | |
2244 | best = est; | |
20a69341 PM |
2245 | } |
2246 | ||
c50b960c PM |
2247 | if (bops != NULL) |
2248 | return bops; | |
2249 | ||
20a69341 PM |
2250 | return ERR_PTR(-EOPNOTSUPP); |
2251 | } | |
2252 | ||
2253 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
2254 | [NFTA_SET_TABLE] = { .type = NLA_STRING }, | |
a9bdd836 PNA |
2255 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
2256 | .len = IFNAMSIZ - 1 }, | |
20a69341 PM |
2257 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2258 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2259 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2260 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2261 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2262 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2263 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2264 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2265 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2266 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
c50b960c PM |
2267 | }; |
2268 | ||
2269 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2270 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2271 | }; |
2272 | ||
2273 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, | |
2274 | const struct sk_buff *skb, | |
2275 | const struct nlmsghdr *nlh, | |
2276 | const struct nlattr * const nla[]) | |
2277 | { | |
99633ab2 | 2278 | struct net *net = sock_net(skb->sk); |
20a69341 | 2279 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7c95f6d8 PNA |
2280 | struct nft_af_info *afi = NULL; |
2281 | struct nft_table *table = NULL; | |
20a69341 | 2282 | |
c9c8e485 PNA |
2283 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
2284 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
2285 | if (IS_ERR(afi)) | |
2286 | return PTR_ERR(afi); | |
2287 | } | |
20a69341 PM |
2288 | |
2289 | if (nla[NFTA_SET_TABLE] != NULL) { | |
ec2c9935 PM |
2290 | if (afi == NULL) |
2291 | return -EAFNOSUPPORT; | |
2292 | ||
9370761c | 2293 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
2294 | if (IS_ERR(table)) |
2295 | return PTR_ERR(table); | |
55dd6f93 PNA |
2296 | if (table->flags & NFT_TABLE_INACTIVE) |
2297 | return -ENOENT; | |
20a69341 PM |
2298 | } |
2299 | ||
0ca743a5 | 2300 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2301 | return 0; |
2302 | } | |
2303 | ||
2304 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, | |
2305 | const struct nlattr *nla) | |
2306 | { | |
2307 | struct nft_set *set; | |
2308 | ||
2309 | if (nla == NULL) | |
2310 | return ERR_PTR(-EINVAL); | |
2311 | ||
2312 | list_for_each_entry(set, &table->sets, list) { | |
2313 | if (!nla_strcmp(nla, set->name)) | |
2314 | return set; | |
2315 | } | |
2316 | return ERR_PTR(-ENOENT); | |
2317 | } | |
2318 | ||
958bee14 PNA |
2319 | struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
2320 | const struct nlattr *nla) | |
2321 | { | |
2322 | struct nft_trans *trans; | |
2323 | u32 id = ntohl(nla_get_be32(nla)); | |
2324 | ||
2325 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
2326 | if (trans->msg_type == NFT_MSG_NEWSET && | |
2327 | id == nft_trans_set_id(trans)) | |
2328 | return nft_trans_set(trans); | |
2329 | } | |
2330 | return ERR_PTR(-ENOENT); | |
2331 | } | |
2332 | ||
20a69341 PM |
2333 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
2334 | const char *name) | |
2335 | { | |
2336 | const struct nft_set *i; | |
2337 | const char *p; | |
2338 | unsigned long *inuse; | |
60eb1894 | 2339 | unsigned int n = 0, min = 0; |
20a69341 PM |
2340 | |
2341 | p = strnchr(name, IFNAMSIZ, '%'); | |
2342 | if (p != NULL) { | |
2343 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2344 | return -EINVAL; | |
2345 | ||
2346 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2347 | if (inuse == NULL) | |
2348 | return -ENOMEM; | |
60eb1894 | 2349 | cont: |
20a69341 | 2350 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2351 | int tmp; |
2352 | ||
2353 | if (!sscanf(i->name, name, &tmp)) | |
20a69341 | 2354 | continue; |
60eb1894 | 2355 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2356 | continue; |
14662917 | 2357 | |
60eb1894 | 2358 | set_bit(tmp - min, inuse); |
20a69341 PM |
2359 | } |
2360 | ||
53b70287 | 2361 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2362 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2363 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2364 | memset(inuse, 0, PAGE_SIZE); | |
2365 | goto cont; | |
2366 | } | |
20a69341 PM |
2367 | free_page((unsigned long)inuse); |
2368 | } | |
2369 | ||
60eb1894 | 2370 | snprintf(set->name, sizeof(set->name), name, min + n); |
20a69341 PM |
2371 | list_for_each_entry(i, &ctx->table->sets, list) { |
2372 | if (!strcmp(set->name, i->name)) | |
2373 | return -ENFILE; | |
2374 | } | |
2375 | return 0; | |
2376 | } | |
2377 | ||
2378 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2379 | const struct nft_set *set, u16 event, u16 flags) | |
2380 | { | |
2381 | struct nfgenmsg *nfmsg; | |
2382 | struct nlmsghdr *nlh; | |
c50b960c | 2383 | struct nlattr *desc; |
128ad332 PNA |
2384 | u32 portid = ctx->portid; |
2385 | u32 seq = ctx->seq; | |
20a69341 PM |
2386 | |
2387 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2388 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2389 | flags); | |
2390 | if (nlh == NULL) | |
2391 | goto nla_put_failure; | |
2392 | ||
2393 | nfmsg = nlmsg_data(nlh); | |
2394 | nfmsg->nfgen_family = ctx->afi->family; | |
2395 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2396 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
2397 | |
2398 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2399 | goto nla_put_failure; | |
2400 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2401 | goto nla_put_failure; | |
2402 | if (set->flags != 0) | |
2403 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2404 | goto nla_put_failure; | |
2405 | ||
2406 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2407 | goto nla_put_failure; | |
2408 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2409 | goto nla_put_failure; | |
2410 | if (set->flags & NFT_SET_MAP) { | |
2411 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2412 | goto nla_put_failure; | |
2413 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2414 | goto nla_put_failure; | |
2415 | } | |
2416 | ||
761da293 PM |
2417 | if (set->timeout && |
2418 | nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout))) | |
2419 | goto nla_put_failure; | |
2420 | if (set->gc_int && | |
2421 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
2422 | goto nla_put_failure; | |
2423 | ||
9363dc4b AB |
2424 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
2425 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
2426 | goto nla_put_failure; | |
2427 | } | |
2428 | ||
c50b960c PM |
2429 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
2430 | if (desc == NULL) | |
2431 | goto nla_put_failure; | |
2432 | if (set->size && | |
2433 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
2434 | goto nla_put_failure; | |
2435 | nla_nest_end(skb, desc); | |
2436 | ||
053c095a JB |
2437 | nlmsg_end(skb, nlh); |
2438 | return 0; | |
20a69341 PM |
2439 | |
2440 | nla_put_failure: | |
2441 | nlmsg_trim(skb, nlh); | |
2442 | return -1; | |
2443 | } | |
2444 | ||
2445 | static int nf_tables_set_notify(const struct nft_ctx *ctx, | |
2446 | const struct nft_set *set, | |
31f8441c | 2447 | int event, gfp_t gfp_flags) |
20a69341 PM |
2448 | { |
2449 | struct sk_buff *skb; | |
128ad332 | 2450 | u32 portid = ctx->portid; |
20a69341 PM |
2451 | int err; |
2452 | ||
128ad332 PNA |
2453 | if (!ctx->report && |
2454 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
20a69341 PM |
2455 | return 0; |
2456 | ||
2457 | err = -ENOBUFS; | |
31f8441c | 2458 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
2459 | if (skb == NULL) |
2460 | goto err; | |
2461 | ||
2462 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2463 | if (err < 0) { | |
2464 | kfree_skb(skb); | |
2465 | goto err; | |
2466 | } | |
2467 | ||
128ad332 | 2468 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, |
31f8441c | 2469 | ctx->report, gfp_flags); |
20a69341 PM |
2470 | err: |
2471 | if (err < 0) | |
99633ab2 | 2472 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
20a69341 PM |
2473 | return err; |
2474 | } | |
2475 | ||
5b96af77 | 2476 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
2477 | { |
2478 | const struct nft_set *set; | |
2479 | unsigned int idx, s_idx = cb->args[0]; | |
7c95f6d8 | 2480 | struct nft_af_info *afi; |
c9c8e485 PNA |
2481 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2482 | struct net *net = sock_net(skb->sk); | |
2483 | int cur_family = cb->args[3]; | |
5b96af77 | 2484 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
2485 | |
2486 | if (cb->args[1]) | |
2487 | return skb->len; | |
2488 | ||
e688a7f8 | 2489 | rcu_read_lock(); |
38e029f1 PNA |
2490 | cb->seq = net->nft.base_seq; |
2491 | ||
e688a7f8 | 2492 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
5b96af77 PNA |
2493 | if (ctx->afi && ctx->afi != afi) |
2494 | continue; | |
2495 | ||
c9c8e485 PNA |
2496 | if (cur_family) { |
2497 | if (afi->family != cur_family) | |
2498 | continue; | |
2499 | ||
2500 | cur_family = 0; | |
2501 | } | |
e688a7f8 | 2502 | list_for_each_entry_rcu(table, &afi->tables, list) { |
5b96af77 PNA |
2503 | if (ctx->table && ctx->table != table) |
2504 | continue; | |
2505 | ||
c9c8e485 PNA |
2506 | if (cur_table) { |
2507 | if (cur_table != table) | |
2508 | continue; | |
2509 | ||
2510 | cur_table = NULL; | |
2511 | } | |
c9c8e485 | 2512 | idx = 0; |
5b96af77 | 2513 | list_for_each_entry_rcu(set, &table->sets, list) { |
c9c8e485 PNA |
2514 | if (idx < s_idx) |
2515 | goto cont; | |
5b96af77 PNA |
2516 | |
2517 | ctx_set = *ctx; | |
2518 | ctx_set.table = table; | |
2519 | ctx_set.afi = afi; | |
2520 | if (nf_tables_fill_set(skb, &ctx_set, set, | |
c9c8e485 PNA |
2521 | NFT_MSG_NEWSET, |
2522 | NLM_F_MULTI) < 0) { | |
2523 | cb->args[0] = idx; | |
2524 | cb->args[2] = (unsigned long) table; | |
2525 | cb->args[3] = afi->family; | |
2526 | goto done; | |
2527 | } | |
38e029f1 | 2528 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 PNA |
2529 | cont: |
2530 | idx++; | |
2531 | } | |
2532 | if (s_idx) | |
2533 | s_idx = 0; | |
2534 | } | |
2535 | } | |
2536 | cb->args[1] = 1; | |
2537 | done: | |
e688a7f8 | 2538 | rcu_read_unlock(); |
c9c8e485 PNA |
2539 | return skb->len; |
2540 | } | |
2541 | ||
5b96af77 | 2542 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 2543 | { |
5b96af77 PNA |
2544 | kfree(cb->data); |
2545 | return 0; | |
20a69341 PM |
2546 | } |
2547 | ||
2548 | static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb, | |
2549 | const struct nlmsghdr *nlh, | |
2550 | const struct nlattr * const nla[]) | |
2551 | { | |
2552 | const struct nft_set *set; | |
2553 | struct nft_ctx ctx; | |
2554 | struct sk_buff *skb2; | |
c9c8e485 | 2555 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2556 | int err; |
2557 | ||
01cfa0a4 | 2558 | /* Verify existence before starting dump */ |
20a69341 PM |
2559 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); |
2560 | if (err < 0) | |
2561 | return err; | |
2562 | ||
2563 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2564 | struct netlink_dump_control c = { | |
2565 | .dump = nf_tables_dump_sets, | |
5b96af77 | 2566 | .done = nf_tables_dump_sets_done, |
20a69341 | 2567 | }; |
5b96af77 PNA |
2568 | struct nft_ctx *ctx_dump; |
2569 | ||
2570 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); | |
2571 | if (ctx_dump == NULL) | |
2572 | return -ENOMEM; | |
2573 | ||
2574 | *ctx_dump = ctx; | |
2575 | c.data = ctx_dump; | |
2576 | ||
20a69341 PM |
2577 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2578 | } | |
2579 | ||
c9c8e485 PNA |
2580 | /* Only accept unspec with dump */ |
2581 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2582 | return -EAFNOSUPPORT; | |
2583 | ||
20a69341 PM |
2584 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
2585 | if (IS_ERR(set)) | |
2586 | return PTR_ERR(set); | |
958bee14 PNA |
2587 | if (set->flags & NFT_SET_INACTIVE) |
2588 | return -ENOENT; | |
20a69341 PM |
2589 | |
2590 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2591 | if (skb2 == NULL) | |
2592 | return -ENOMEM; | |
2593 | ||
2594 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2595 | if (err < 0) | |
2596 | goto err; | |
2597 | ||
2598 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2599 | ||
2600 | err: | |
2601 | kfree_skb(skb2); | |
2602 | return err; | |
2603 | } | |
2604 | ||
c50b960c PM |
2605 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
2606 | struct nft_set_desc *desc, | |
2607 | const struct nlattr *nla) | |
2608 | { | |
2609 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
2610 | int err; | |
2611 | ||
2612 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy); | |
2613 | if (err < 0) | |
2614 | return err; | |
2615 | ||
2616 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
2617 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
2618 | ||
2619 | return 0; | |
2620 | } | |
2621 | ||
20a69341 PM |
2622 | static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb, |
2623 | const struct nlmsghdr *nlh, | |
2624 | const struct nlattr * const nla[]) | |
2625 | { | |
2626 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
2627 | const struct nft_set_ops *ops; | |
7c95f6d8 | 2628 | struct nft_af_info *afi; |
99633ab2 | 2629 | struct net *net = sock_net(skb->sk); |
20a69341 PM |
2630 | struct nft_table *table; |
2631 | struct nft_set *set; | |
2632 | struct nft_ctx ctx; | |
2633 | char name[IFNAMSIZ]; | |
2634 | unsigned int size; | |
2635 | bool create; | |
761da293 PM |
2636 | u64 timeout; |
2637 | u32 ktype, dtype, flags, policy, gc_int; | |
c50b960c | 2638 | struct nft_set_desc desc; |
20a69341 PM |
2639 | int err; |
2640 | ||
2641 | if (nla[NFTA_SET_TABLE] == NULL || | |
2642 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
2643 | nla[NFTA_SET_KEY_LEN] == NULL || |
2644 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
2645 | return -EINVAL; |
2646 | ||
c50b960c PM |
2647 | memset(&desc, 0, sizeof(desc)); |
2648 | ||
20a69341 PM |
2649 | ktype = NFT_DATA_VALUE; |
2650 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
2651 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
2652 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
2653 | return -EINVAL; | |
2654 | } | |
2655 | ||
c50b960c | 2656 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 2657 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
2658 | return -EINVAL; |
2659 | ||
2660 | flags = 0; | |
2661 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2662 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
2663 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 PM |
2664 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
2665 | NFT_SET_MAP | NFT_SET_EVAL)) | |
20a69341 | 2666 | return -EINVAL; |
7c6c6e95 PM |
2667 | /* Only one of both operations is supported */ |
2668 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) == | |
2669 | (NFT_SET_MAP | NFT_SET_EVAL)) | |
2670 | return -EOPNOTSUPP; | |
20a69341 PM |
2671 | } |
2672 | ||
2673 | dtype = 0; | |
20a69341 PM |
2674 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
2675 | if (!(flags & NFT_SET_MAP)) | |
2676 | return -EINVAL; | |
2677 | ||
2678 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
2679 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
2680 | dtype != NFT_DATA_VERDICT) | |
2681 | return -EINVAL; | |
2682 | ||
2683 | if (dtype != NFT_DATA_VERDICT) { | |
2684 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
2685 | return -EINVAL; | |
c50b960c | 2686 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 2687 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
2688 | return -EINVAL; |
2689 | } else | |
7d740264 | 2690 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
2691 | } else if (flags & NFT_SET_MAP) |
2692 | return -EINVAL; | |
2693 | ||
761da293 PM |
2694 | timeout = 0; |
2695 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
2696 | if (!(flags & NFT_SET_TIMEOUT)) | |
2697 | return -EINVAL; | |
2698 | timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT])); | |
2699 | } | |
2700 | gc_int = 0; | |
2701 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
2702 | if (!(flags & NFT_SET_TIMEOUT)) | |
2703 | return -EINVAL; | |
2704 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
2705 | } | |
2706 | ||
c50b960c PM |
2707 | policy = NFT_SET_POL_PERFORMANCE; |
2708 | if (nla[NFTA_SET_POLICY] != NULL) | |
2709 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
2710 | ||
2711 | if (nla[NFTA_SET_DESC] != NULL) { | |
2712 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
2713 | if (err < 0) | |
2714 | return err; | |
2715 | } | |
2716 | ||
20a69341 PM |
2717 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
2718 | ||
99633ab2 | 2719 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
2720 | if (IS_ERR(afi)) |
2721 | return PTR_ERR(afi); | |
2722 | ||
9370761c | 2723 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
2724 | if (IS_ERR(table)) |
2725 | return PTR_ERR(table); | |
2726 | ||
0ca743a5 | 2727 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2728 | |
2729 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); | |
2730 | if (IS_ERR(set)) { | |
2731 | if (PTR_ERR(set) != -ENOENT) | |
2732 | return PTR_ERR(set); | |
2733 | set = NULL; | |
2734 | } | |
2735 | ||
2736 | if (set != NULL) { | |
2737 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2738 | return -EEXIST; | |
2739 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2740 | return -EOPNOTSUPP; | |
2741 | return 0; | |
2742 | } | |
2743 | ||
2744 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2745 | return -ENOENT; | |
2746 | ||
c50b960c | 2747 | ops = nft_select_set_ops(nla, &desc, policy); |
20a69341 PM |
2748 | if (IS_ERR(ops)) |
2749 | return PTR_ERR(ops); | |
2750 | ||
2751 | size = 0; | |
2752 | if (ops->privsize != NULL) | |
2753 | size = ops->privsize(nla); | |
2754 | ||
2755 | err = -ENOMEM; | |
2756 | set = kzalloc(sizeof(*set) + size, GFP_KERNEL); | |
2757 | if (set == NULL) | |
2758 | goto err1; | |
2759 | ||
2760 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); | |
2761 | err = nf_tables_set_alloc_name(&ctx, set, name); | |
2762 | if (err < 0) | |
2763 | goto err2; | |
2764 | ||
2765 | INIT_LIST_HEAD(&set->bindings); | |
cc02e457 | 2766 | write_pnet(&set->pnet, net); |
20a69341 PM |
2767 | set->ops = ops; |
2768 | set->ktype = ktype; | |
c50b960c | 2769 | set->klen = desc.klen; |
20a69341 | 2770 | set->dtype = dtype; |
c50b960c | 2771 | set->dlen = desc.dlen; |
20a69341 | 2772 | set->flags = flags; |
c50b960c | 2773 | set->size = desc.size; |
9363dc4b | 2774 | set->policy = policy; |
761da293 PM |
2775 | set->timeout = timeout; |
2776 | set->gc_int = gc_int; | |
20a69341 | 2777 | |
c50b960c | 2778 | err = ops->init(set, &desc, nla); |
20a69341 PM |
2779 | if (err < 0) |
2780 | goto err2; | |
2781 | ||
958bee14 | 2782 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 PM |
2783 | if (err < 0) |
2784 | goto err2; | |
2785 | ||
e688a7f8 | 2786 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 2787 | table->use++; |
20a69341 PM |
2788 | return 0; |
2789 | ||
2790 | err2: | |
2791 | kfree(set); | |
2792 | err1: | |
2793 | module_put(ops->owner); | |
2794 | return err; | |
2795 | } | |
2796 | ||
958bee14 | 2797 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 2798 | { |
20a69341 PM |
2799 | set->ops->destroy(set); |
2800 | module_put(set->ops->owner); | |
2801 | kfree(set); | |
2802 | } | |
2803 | ||
958bee14 PNA |
2804 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
2805 | { | |
e688a7f8 | 2806 | list_del_rcu(&set->list); |
31f8441c | 2807 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
2808 | nft_set_destroy(set); |
2809 | } | |
2810 | ||
20a69341 PM |
2811 | static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb, |
2812 | const struct nlmsghdr *nlh, | |
2813 | const struct nlattr * const nla[]) | |
2814 | { | |
c9c8e485 | 2815 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2816 | struct nft_set *set; |
2817 | struct nft_ctx ctx; | |
2818 | int err; | |
2819 | ||
ec2c9935 PM |
2820 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
2821 | return -EAFNOSUPPORT; | |
20a69341 PM |
2822 | if (nla[NFTA_SET_TABLE] == NULL) |
2823 | return -EINVAL; | |
2824 | ||
2825 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); | |
2826 | if (err < 0) | |
2827 | return err; | |
2828 | ||
2829 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); | |
2830 | if (IS_ERR(set)) | |
2831 | return PTR_ERR(set); | |
958bee14 PNA |
2832 | if (set->flags & NFT_SET_INACTIVE) |
2833 | return -ENOENT; | |
20a69341 PM |
2834 | if (!list_empty(&set->bindings)) |
2835 | return -EBUSY; | |
2836 | ||
ee01d542 | 2837 | return nft_delset(&ctx, set); |
20a69341 PM |
2838 | } |
2839 | ||
2840 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
2841 | const struct nft_set *set, | |
2842 | const struct nft_set_iter *iter, | |
2843 | const struct nft_set_elem *elem) | |
2844 | { | |
fe2811eb | 2845 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
2846 | enum nft_registers dreg; |
2847 | ||
2848 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
2849 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
2850 | set->dtype == NFT_DATA_VERDICT ? | |
2851 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
2852 | set->dlen); | |
20a69341 PM |
2853 | } |
2854 | ||
2855 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2856 | struct nft_set_binding *binding) | |
2857 | { | |
2858 | struct nft_set_binding *i; | |
2859 | struct nft_set_iter iter; | |
2860 | ||
2861 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
2862 | return -EBUSY; | |
2863 | ||
11113e19 | 2864 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
2865 | /* If the set is already bound to the same chain all |
2866 | * jumps are already validated for that chain. | |
2867 | */ | |
2868 | list_for_each_entry(i, &set->bindings, list) { | |
11113e19 PM |
2869 | if (binding->flags & NFT_SET_MAP && |
2870 | i->chain == binding->chain) | |
20a69341 PM |
2871 | goto bind; |
2872 | } | |
2873 | ||
2874 | iter.skip = 0; | |
2875 | iter.count = 0; | |
2876 | iter.err = 0; | |
2877 | iter.fn = nf_tables_bind_check_setelem; | |
2878 | ||
2879 | set->ops->walk(ctx, set, &iter); | |
2880 | if (iter.err < 0) { | |
2881 | /* Destroy anonymous sets if binding fails */ | |
2882 | if (set->flags & NFT_SET_ANONYMOUS) | |
2883 | nf_tables_set_destroy(ctx, set); | |
2884 | ||
2885 | return iter.err; | |
2886 | } | |
2887 | } | |
2888 | bind: | |
2889 | binding->chain = ctx->chain; | |
e688a7f8 | 2890 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
2891 | return 0; |
2892 | } | |
2893 | ||
2894 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2895 | struct nft_set_binding *binding) | |
2896 | { | |
e688a7f8 | 2897 | list_del_rcu(&binding->list); |
20a69341 | 2898 | |
958bee14 PNA |
2899 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
2900 | !(set->flags & NFT_SET_INACTIVE)) | |
20a69341 PM |
2901 | nf_tables_set_destroy(ctx, set); |
2902 | } | |
2903 | ||
3ac4c07a PM |
2904 | const struct nft_set_ext_type nft_set_ext_types[] = { |
2905 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 2906 | .align = __alignof__(u32), |
3ac4c07a PM |
2907 | }, |
2908 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 2909 | .align = __alignof__(u32), |
3ac4c07a | 2910 | }, |
f25ad2e9 PM |
2911 | [NFT_SET_EXT_EXPR] = { |
2912 | .align = __alignof__(struct nft_expr), | |
2913 | }, | |
3ac4c07a PM |
2914 | [NFT_SET_EXT_FLAGS] = { |
2915 | .len = sizeof(u8), | |
2916 | .align = __alignof__(u8), | |
2917 | }, | |
c3e1b005 PM |
2918 | [NFT_SET_EXT_TIMEOUT] = { |
2919 | .len = sizeof(u64), | |
2920 | .align = __alignof__(u64), | |
2921 | }, | |
2922 | [NFT_SET_EXT_EXPIRATION] = { | |
2923 | .len = sizeof(unsigned long), | |
2924 | .align = __alignof__(unsigned long), | |
2925 | }, | |
68e942e8 PM |
2926 | [NFT_SET_EXT_USERDATA] = { |
2927 | .len = sizeof(struct nft_userdata), | |
2928 | .align = __alignof__(struct nft_userdata), | |
2929 | }, | |
3ac4c07a PM |
2930 | }; |
2931 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
2932 | ||
20a69341 PM |
2933 | /* |
2934 | * Set elements | |
2935 | */ | |
2936 | ||
2937 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
2938 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
2939 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
2940 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 2941 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
2942 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
2943 | .len = NFT_USERDATA_MAXLEN }, | |
20a69341 PM |
2944 | }; |
2945 | ||
2946 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
2947 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING }, | |
2948 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING }, | |
2949 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, | |
958bee14 | 2950 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
2951 | }; |
2952 | ||
2953 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, | |
2954 | const struct sk_buff *skb, | |
2955 | const struct nlmsghdr *nlh, | |
55dd6f93 PNA |
2956 | const struct nlattr * const nla[], |
2957 | bool trans) | |
20a69341 PM |
2958 | { |
2959 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
2960 | struct nft_af_info *afi; |
2961 | struct nft_table *table; | |
99633ab2 | 2962 | struct net *net = sock_net(skb->sk); |
20a69341 | 2963 | |
99633ab2 | 2964 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
2965 | if (IS_ERR(afi)) |
2966 | return PTR_ERR(afi); | |
2967 | ||
9370761c | 2968 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]); |
20a69341 PM |
2969 | if (IS_ERR(table)) |
2970 | return PTR_ERR(table); | |
55dd6f93 PNA |
2971 | if (!trans && (table->flags & NFT_TABLE_INACTIVE)) |
2972 | return -ENOENT; | |
20a69341 | 2973 | |
0ca743a5 | 2974 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2975 | return 0; |
2976 | } | |
2977 | ||
2978 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
2979 | const struct nft_set *set, | |
2980 | const struct nft_set_elem *elem) | |
2981 | { | |
fe2811eb | 2982 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
2983 | unsigned char *b = skb_tail_pointer(skb); |
2984 | struct nlattr *nest; | |
2985 | ||
2986 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
2987 | if (nest == NULL) | |
2988 | goto nla_put_failure; | |
2989 | ||
fe2811eb PM |
2990 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
2991 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
2992 | goto nla_put_failure; |
2993 | ||
fe2811eb PM |
2994 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
2995 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
2996 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
2997 | set->dlen) < 0) | |
2998 | goto nla_put_failure; | |
2999 | ||
f25ad2e9 PM |
3000 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3001 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3002 | goto nla_put_failure; | |
3003 | ||
fe2811eb PM |
3004 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3005 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3006 | htonl(*nft_set_ext_flags(ext)))) | |
3007 | goto nla_put_failure; | |
20a69341 | 3008 | |
c3e1b005 PM |
3009 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3010 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
3011 | cpu_to_be64(*nft_set_ext_timeout(ext)))) | |
3012 | goto nla_put_failure; | |
3013 | ||
3014 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
3015 | unsigned long expires, now = jiffies; | |
3016 | ||
3017 | expires = *nft_set_ext_expiration(ext); | |
3018 | if (time_before(now, expires)) | |
3019 | expires -= now; | |
3020 | else | |
3021 | expires = 0; | |
3022 | ||
3023 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
3024 | cpu_to_be64(jiffies_to_msecs(expires)))) | |
3025 | goto nla_put_failure; | |
3026 | } | |
3027 | ||
68e942e8 PM |
3028 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3029 | struct nft_userdata *udata; | |
3030 | ||
3031 | udata = nft_set_ext_userdata(ext); | |
3032 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3033 | udata->len + 1, udata->data)) | |
3034 | goto nla_put_failure; | |
3035 | } | |
3036 | ||
20a69341 PM |
3037 | nla_nest_end(skb, nest); |
3038 | return 0; | |
3039 | ||
3040 | nla_put_failure: | |
3041 | nlmsg_trim(skb, b); | |
3042 | return -EMSGSIZE; | |
3043 | } | |
3044 | ||
3045 | struct nft_set_dump_args { | |
3046 | const struct netlink_callback *cb; | |
3047 | struct nft_set_iter iter; | |
3048 | struct sk_buff *skb; | |
3049 | }; | |
3050 | ||
3051 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
3052 | const struct nft_set *set, | |
3053 | const struct nft_set_iter *iter, | |
3054 | const struct nft_set_elem *elem) | |
3055 | { | |
3056 | struct nft_set_dump_args *args; | |
3057 | ||
3058 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3059 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3060 | } | |
3061 | ||
3062 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) | |
3063 | { | |
3064 | const struct nft_set *set; | |
3065 | struct nft_set_dump_args args; | |
3066 | struct nft_ctx ctx; | |
3067 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; | |
3068 | struct nfgenmsg *nfmsg; | |
3069 | struct nlmsghdr *nlh; | |
3070 | struct nlattr *nest; | |
3071 | u32 portid, seq; | |
3072 | int event, err; | |
3073 | ||
720e0dfa MN |
3074 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
3075 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); | |
20a69341 PM |
3076 | if (err < 0) |
3077 | return err; | |
3078 | ||
55dd6f93 PNA |
3079 | err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla, |
3080 | false); | |
20a69341 PM |
3081 | if (err < 0) |
3082 | return err; | |
3083 | ||
3084 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
3085 | if (IS_ERR(set)) | |
3086 | return PTR_ERR(set); | |
958bee14 PNA |
3087 | if (set->flags & NFT_SET_INACTIVE) |
3088 | return -ENOENT; | |
20a69341 PM |
3089 | |
3090 | event = NFT_MSG_NEWSETELEM; | |
3091 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
3092 | portid = NETLINK_CB(cb->skb).portid; | |
3093 | seq = cb->nlh->nlmsg_seq; | |
3094 | ||
3095 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3096 | NLM_F_MULTI); | |
3097 | if (nlh == NULL) | |
3098 | goto nla_put_failure; | |
3099 | ||
3100 | nfmsg = nlmsg_data(nlh); | |
6403d962 | 3101 | nfmsg->nfgen_family = ctx.afi->family; |
20a69341 | 3102 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 3103 | nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff); |
20a69341 PM |
3104 | |
3105 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) | |
3106 | goto nla_put_failure; | |
3107 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3108 | goto nla_put_failure; | |
3109 | ||
3110 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3111 | if (nest == NULL) | |
3112 | goto nla_put_failure; | |
3113 | ||
3114 | args.cb = cb; | |
3115 | args.skb = skb; | |
3116 | args.iter.skip = cb->args[0]; | |
3117 | args.iter.count = 0; | |
3118 | args.iter.err = 0; | |
3119 | args.iter.fn = nf_tables_dump_setelem; | |
3120 | set->ops->walk(&ctx, set, &args.iter); | |
3121 | ||
3122 | nla_nest_end(skb, nest); | |
3123 | nlmsg_end(skb, nlh); | |
3124 | ||
3125 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3126 | return args.iter.err; | |
3127 | if (args.iter.count == cb->args[0]) | |
3128 | return 0; | |
3129 | ||
3130 | cb->args[0] = args.iter.count; | |
3131 | return skb->len; | |
3132 | ||
3133 | nla_put_failure: | |
3134 | return -ENOSPC; | |
3135 | } | |
3136 | ||
3137 | static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb, | |
3138 | const struct nlmsghdr *nlh, | |
3139 | const struct nlattr * const nla[]) | |
3140 | { | |
3141 | const struct nft_set *set; | |
3142 | struct nft_ctx ctx; | |
3143 | int err; | |
3144 | ||
55dd6f93 | 3145 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false); |
20a69341 PM |
3146 | if (err < 0) |
3147 | return err; | |
3148 | ||
3149 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
3150 | if (IS_ERR(set)) | |
3151 | return PTR_ERR(set); | |
958bee14 PNA |
3152 | if (set->flags & NFT_SET_INACTIVE) |
3153 | return -ENOENT; | |
20a69341 PM |
3154 | |
3155 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3156 | struct netlink_dump_control c = { | |
3157 | .dump = nf_tables_dump_set, | |
3158 | }; | |
3159 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
3160 | } | |
3161 | return -EOPNOTSUPP; | |
3162 | } | |
3163 | ||
d60ce62f AB |
3164 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
3165 | const struct nft_ctx *ctx, u32 seq, | |
3166 | u32 portid, int event, u16 flags, | |
3167 | const struct nft_set *set, | |
3168 | const struct nft_set_elem *elem) | |
3169 | { | |
3170 | struct nfgenmsg *nfmsg; | |
3171 | struct nlmsghdr *nlh; | |
3172 | struct nlattr *nest; | |
3173 | int err; | |
3174 | ||
3175 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
3176 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3177 | flags); | |
3178 | if (nlh == NULL) | |
3179 | goto nla_put_failure; | |
3180 | ||
3181 | nfmsg = nlmsg_data(nlh); | |
3182 | nfmsg->nfgen_family = ctx->afi->family; | |
3183 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 3184 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
3185 | |
3186 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3187 | goto nla_put_failure; | |
3188 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3189 | goto nla_put_failure; | |
3190 | ||
3191 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3192 | if (nest == NULL) | |
3193 | goto nla_put_failure; | |
3194 | ||
3195 | err = nf_tables_fill_setelem(skb, set, elem); | |
3196 | if (err < 0) | |
3197 | goto nla_put_failure; | |
3198 | ||
3199 | nla_nest_end(skb, nest); | |
3200 | ||
053c095a JB |
3201 | nlmsg_end(skb, nlh); |
3202 | return 0; | |
d60ce62f AB |
3203 | |
3204 | nla_put_failure: | |
3205 | nlmsg_trim(skb, nlh); | |
3206 | return -1; | |
3207 | } | |
3208 | ||
3209 | static int nf_tables_setelem_notify(const struct nft_ctx *ctx, | |
3210 | const struct nft_set *set, | |
3211 | const struct nft_set_elem *elem, | |
3212 | int event, u16 flags) | |
3213 | { | |
128ad332 PNA |
3214 | struct net *net = ctx->net; |
3215 | u32 portid = ctx->portid; | |
d60ce62f AB |
3216 | struct sk_buff *skb; |
3217 | int err; | |
3218 | ||
128ad332 | 3219 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
d60ce62f AB |
3220 | return 0; |
3221 | ||
3222 | err = -ENOBUFS; | |
3223 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
3224 | if (skb == NULL) | |
3225 | goto err; | |
3226 | ||
3227 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
3228 | set, elem); | |
3229 | if (err < 0) { | |
3230 | kfree_skb(skb); | |
3231 | goto err; | |
3232 | } | |
3233 | ||
128ad332 | 3234 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
d60ce62f AB |
3235 | GFP_KERNEL); |
3236 | err: | |
3237 | if (err < 0) | |
3238 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
3239 | return err; | |
3240 | } | |
3241 | ||
60319eb1 PNA |
3242 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
3243 | int msg_type, | |
3244 | struct nft_set *set) | |
3245 | { | |
3246 | struct nft_trans *trans; | |
3247 | ||
3248 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
3249 | if (trans == NULL) | |
3250 | return NULL; | |
3251 | ||
3252 | nft_trans_elem_set(trans) = set; | |
3253 | return trans; | |
3254 | } | |
3255 | ||
22fe54d5 PM |
3256 | void *nft_set_elem_init(const struct nft_set *set, |
3257 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 3258 | const u32 *key, const u32 *data, |
22fe54d5 | 3259 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
3260 | { |
3261 | struct nft_set_ext *ext; | |
3262 | void *elem; | |
3263 | ||
3264 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
3265 | if (elem == NULL) | |
3266 | return NULL; | |
3267 | ||
3268 | ext = nft_set_elem_ext(set, elem); | |
3269 | nft_set_ext_init(ext, tmpl); | |
3270 | ||
3271 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
3272 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3273 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
3274 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
3275 | *nft_set_ext_expiration(ext) = | |
3276 | jiffies + msecs_to_jiffies(timeout); | |
3277 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) | |
3278 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
3279 | |
3280 | return elem; | |
3281 | } | |
3282 | ||
61edafbb PM |
3283 | void nft_set_elem_destroy(const struct nft_set *set, void *elem) |
3284 | { | |
3285 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3286 | ||
3287 | nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE); | |
3288 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3289 | nft_data_uninit(nft_set_ext_data(ext), set->dtype); | |
f25ad2e9 PM |
3290 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) |
3291 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); | |
61edafbb PM |
3292 | |
3293 | kfree(elem); | |
3294 | } | |
3295 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
3296 | ||
60319eb1 | 3297 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
3298 | const struct nlattr *attr) |
3299 | { | |
3300 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3301 | struct nft_data_desc d1, d2; | |
fe2811eb PM |
3302 | struct nft_set_ext_tmpl tmpl; |
3303 | struct nft_set_ext *ext; | |
20a69341 PM |
3304 | struct nft_set_elem elem; |
3305 | struct nft_set_binding *binding; | |
68e942e8 | 3306 | struct nft_userdata *udata; |
fe2811eb | 3307 | struct nft_data data; |
20a69341 | 3308 | enum nft_registers dreg; |
60319eb1 | 3309 | struct nft_trans *trans; |
c3e1b005 | 3310 | u64 timeout; |
fe2811eb | 3311 | u32 flags; |
68e942e8 | 3312 | u8 ulen; |
20a69341 PM |
3313 | int err; |
3314 | ||
3315 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3316 | nft_set_elem_policy); | |
3317 | if (err < 0) | |
3318 | return err; | |
3319 | ||
3320 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3321 | return -EINVAL; | |
3322 | ||
fe2811eb PM |
3323 | nft_set_ext_prepare(&tmpl); |
3324 | ||
3325 | flags = 0; | |
20a69341 | 3326 | if (nla[NFTA_SET_ELEM_FLAGS] != NULL) { |
fe2811eb PM |
3327 | flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS])); |
3328 | if (flags & ~NFT_SET_ELEM_INTERVAL_END) | |
20a69341 | 3329 | return -EINVAL; |
55df35d2 | 3330 | if (!(set->flags & NFT_SET_INTERVAL) && |
fe2811eb | 3331 | flags & NFT_SET_ELEM_INTERVAL_END) |
55df35d2 | 3332 | return -EINVAL; |
fe2811eb PM |
3333 | if (flags != 0) |
3334 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
3335 | } |
3336 | ||
3337 | if (set->flags & NFT_SET_MAP) { | |
3338 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 3339 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 3340 | return -EINVAL; |
bd7fc645 | 3341 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 3342 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 3343 | return -EINVAL; |
20a69341 PM |
3344 | } else { |
3345 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
3346 | return -EINVAL; | |
3347 | } | |
3348 | ||
c3e1b005 PM |
3349 | timeout = 0; |
3350 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
3351 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
3352 | return -EINVAL; | |
3353 | timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT])); | |
3354 | } else if (set->flags & NFT_SET_TIMEOUT) { | |
3355 | timeout = set->timeout; | |
3356 | } | |
3357 | ||
7d740264 | 3358 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 3359 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3360 | if (err < 0) |
3361 | goto err1; | |
3362 | err = -EINVAL; | |
3363 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
3364 | goto err2; | |
3365 | ||
7d740264 | 3366 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
3367 | if (timeout > 0) { |
3368 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
3369 | if (timeout != set->timeout) | |
3370 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
3371 | } | |
fe2811eb | 3372 | |
20a69341 | 3373 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
3374 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
3375 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
3376 | if (err < 0) |
3377 | goto err2; | |
3378 | ||
3379 | err = -EINVAL; | |
3380 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
3381 | goto err3; | |
3382 | ||
3383 | dreg = nft_type_to_reg(set->dtype); | |
3384 | list_for_each_entry(binding, &set->bindings, list) { | |
3385 | struct nft_ctx bind_ctx = { | |
3386 | .afi = ctx->afi, | |
3387 | .table = ctx->table, | |
7c95f6d8 | 3388 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
3389 | }; |
3390 | ||
11113e19 PM |
3391 | if (!(binding->flags & NFT_SET_MAP)) |
3392 | continue; | |
3393 | ||
1ec10212 PM |
3394 | err = nft_validate_register_store(&bind_ctx, dreg, |
3395 | &data, | |
3396 | d2.type, d2.len); | |
20a69341 PM |
3397 | if (err < 0) |
3398 | goto err3; | |
3399 | } | |
fe2811eb | 3400 | |
7d740264 | 3401 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
3402 | } |
3403 | ||
68e942e8 PM |
3404 | /* The full maximum length of userdata can exceed the maximum |
3405 | * offset value (U8_MAX) for following extensions, therefor it | |
3406 | * must be the last extension added. | |
3407 | */ | |
3408 | ulen = 0; | |
3409 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
3410 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
3411 | if (ulen > 0) | |
3412 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
3413 | ulen); | |
3414 | } | |
3415 | ||
fe2811eb | 3416 | err = -ENOMEM; |
7d740264 | 3417 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 3418 | timeout, GFP_KERNEL); |
fe2811eb PM |
3419 | if (elem.priv == NULL) |
3420 | goto err3; | |
3421 | ||
3422 | ext = nft_set_elem_ext(set, elem.priv); | |
3423 | if (flags) | |
3424 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
3425 | if (ulen > 0) { |
3426 | udata = nft_set_ext_userdata(ext); | |
3427 | udata->len = ulen - 1; | |
3428 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
3429 | } | |
fe2811eb | 3430 | |
60319eb1 PNA |
3431 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
3432 | if (trans == NULL) | |
fe2811eb | 3433 | goto err4; |
60319eb1 | 3434 | |
69086658 | 3435 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
20a69341 PM |
3436 | err = set->ops->insert(set, &elem); |
3437 | if (err < 0) | |
fe2811eb | 3438 | goto err5; |
20a69341 | 3439 | |
60319eb1 | 3440 | nft_trans_elem(trans) = elem; |
46bbafce | 3441 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
3442 | return 0; |
3443 | ||
fe2811eb | 3444 | err5: |
60319eb1 | 3445 | kfree(trans); |
fe2811eb PM |
3446 | err4: |
3447 | kfree(elem.priv); | |
20a69341 PM |
3448 | err3: |
3449 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
fe2811eb | 3450 | nft_data_uninit(&data, d2.type); |
20a69341 | 3451 | err2: |
7d740264 | 3452 | nft_data_uninit(&elem.key.val, d1.type); |
20a69341 PM |
3453 | err1: |
3454 | return err; | |
3455 | } | |
3456 | ||
3457 | static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb, | |
3458 | const struct nlmsghdr *nlh, | |
3459 | const struct nlattr * const nla[]) | |
3460 | { | |
958bee14 | 3461 | struct net *net = sock_net(skb->sk); |
20a69341 PM |
3462 | const struct nlattr *attr; |
3463 | struct nft_set *set; | |
3464 | struct nft_ctx ctx; | |
60319eb1 | 3465 | int rem, err = 0; |
20a69341 | 3466 | |
7d5570ca PNA |
3467 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
3468 | return -EINVAL; | |
3469 | ||
55dd6f93 | 3470 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true); |
20a69341 PM |
3471 | if (err < 0) |
3472 | return err; | |
3473 | ||
3474 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
958bee14 PNA |
3475 | if (IS_ERR(set)) { |
3476 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { | |
3477 | set = nf_tables_set_lookup_byid(net, | |
3478 | nla[NFTA_SET_ELEM_LIST_SET_ID]); | |
3479 | } | |
3480 | if (IS_ERR(set)) | |
3481 | return PTR_ERR(set); | |
3482 | } | |
3483 | ||
20a69341 PM |
3484 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
3485 | return -EBUSY; | |
3486 | ||
3487 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3dd0673a PM |
3488 | if (set->size && |
3489 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) | |
3490 | return -ENFILE; | |
3491 | ||
20a69341 | 3492 | err = nft_add_set_elem(&ctx, set, attr); |
3dd0673a PM |
3493 | if (err < 0) { |
3494 | atomic_dec(&set->nelems); | |
60319eb1 | 3495 | break; |
3dd0673a | 3496 | } |
20a69341 | 3497 | } |
60319eb1 | 3498 | return err; |
20a69341 PM |
3499 | } |
3500 | ||
60319eb1 | 3501 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
3502 | const struct nlattr *attr) |
3503 | { | |
3504 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3505 | struct nft_data_desc desc; | |
3506 | struct nft_set_elem elem; | |
60319eb1 | 3507 | struct nft_trans *trans; |
20a69341 PM |
3508 | int err; |
3509 | ||
3510 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3511 | nft_set_elem_policy); | |
3512 | if (err < 0) | |
3513 | goto err1; | |
3514 | ||
3515 | err = -EINVAL; | |
3516 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3517 | goto err1; | |
3518 | ||
7d740264 | 3519 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 3520 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3521 | if (err < 0) |
3522 | goto err1; | |
3523 | ||
3524 | err = -EINVAL; | |
3525 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
3526 | goto err2; | |
3527 | ||
60319eb1 | 3528 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
3529 | if (trans == NULL) { |
3530 | err = -ENOMEM; | |
60319eb1 | 3531 | goto err2; |
609ccf08 | 3532 | } |
20a69341 | 3533 | |
cc02e457 PM |
3534 | elem.priv = set->ops->deactivate(set, &elem); |
3535 | if (elem.priv == NULL) { | |
3536 | err = -ENOENT; | |
3537 | goto err3; | |
3538 | } | |
3539 | ||
60319eb1 | 3540 | nft_trans_elem(trans) = elem; |
46bbafce | 3541 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 3542 | return 0; |
cc02e457 PM |
3543 | |
3544 | err3: | |
3545 | kfree(trans); | |
20a69341 | 3546 | err2: |
7d740264 | 3547 | nft_data_uninit(&elem.key.val, desc.type); |
20a69341 PM |
3548 | err1: |
3549 | return err; | |
3550 | } | |
3551 | ||
3552 | static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb, | |
3553 | const struct nlmsghdr *nlh, | |
3554 | const struct nlattr * const nla[]) | |
3555 | { | |
3556 | const struct nlattr *attr; | |
3557 | struct nft_set *set; | |
3558 | struct nft_ctx ctx; | |
60319eb1 | 3559 | int rem, err = 0; |
20a69341 | 3560 | |
7d5570ca PNA |
3561 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
3562 | return -EINVAL; | |
3563 | ||
55dd6f93 | 3564 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false); |
20a69341 PM |
3565 | if (err < 0) |
3566 | return err; | |
3567 | ||
3568 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
3569 | if (IS_ERR(set)) | |
3570 | return PTR_ERR(set); | |
3571 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
3572 | return -EBUSY; | |
3573 | ||
3574 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3575 | err = nft_del_setelem(&ctx, set, attr); | |
3576 | if (err < 0) | |
60319eb1 | 3577 | break; |
4fefee57 | 3578 | |
3dd0673a | 3579 | set->ndeact++; |
20a69341 | 3580 | } |
60319eb1 | 3581 | return err; |
20a69341 PM |
3582 | } |
3583 | ||
cfed7e1b PM |
3584 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
3585 | { | |
3586 | struct nft_set_gc_batch *gcb; | |
3587 | unsigned int i; | |
3588 | ||
3589 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
3590 | for (i = 0; i < gcb->head.cnt; i++) | |
3591 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i]); | |
3592 | kfree(gcb); | |
3593 | } | |
3594 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
3595 | ||
3596 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
3597 | gfp_t gfp) | |
3598 | { | |
3599 | struct nft_set_gc_batch *gcb; | |
3600 | ||
3601 | gcb = kzalloc(sizeof(*gcb), gfp); | |
3602 | if (gcb == NULL) | |
3603 | return gcb; | |
3604 | gcb->head.set = set; | |
3605 | return gcb; | |
3606 | } | |
3607 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
3608 | ||
84d7fce6 PNA |
3609 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
3610 | u32 portid, u32 seq) | |
3611 | { | |
3612 | struct nlmsghdr *nlh; | |
3613 | struct nfgenmsg *nfmsg; | |
3614 | int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN; | |
3615 | ||
3616 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
3617 | if (nlh == NULL) | |
3618 | goto nla_put_failure; | |
3619 | ||
3620 | nfmsg = nlmsg_data(nlh); | |
3621 | nfmsg->nfgen_family = AF_UNSPEC; | |
3622 | nfmsg->version = NFNETLINK_V0; | |
3623 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
3624 | ||
3625 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq))) | |
3626 | goto nla_put_failure; | |
3627 | ||
053c095a JB |
3628 | nlmsg_end(skb, nlh); |
3629 | return 0; | |
84d7fce6 PNA |
3630 | |
3631 | nla_put_failure: | |
3632 | nlmsg_trim(skb, nlh); | |
3633 | return -EMSGSIZE; | |
3634 | } | |
3635 | ||
3636 | static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event) | |
3637 | { | |
3638 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
3639 | struct sk_buff *skb2; | |
3640 | int err; | |
3641 | ||
3642 | if (nlmsg_report(nlh) && | |
3643 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
3644 | return 0; | |
3645 | ||
3646 | err = -ENOBUFS; | |
3647 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
3648 | if (skb2 == NULL) | |
3649 | goto err; | |
3650 | ||
3651 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
3652 | nlh->nlmsg_seq); | |
3653 | if (err < 0) { | |
3654 | kfree_skb(skb2); | |
3655 | goto err; | |
3656 | } | |
3657 | ||
3658 | err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, | |
3659 | NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL); | |
3660 | err: | |
3661 | if (err < 0) { | |
3662 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, | |
3663 | err); | |
3664 | } | |
3665 | return err; | |
3666 | } | |
3667 | ||
3668 | static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb, | |
3669 | const struct nlmsghdr *nlh, | |
3670 | const struct nlattr * const nla[]) | |
3671 | { | |
3672 | struct net *net = sock_net(skb->sk); | |
3673 | struct sk_buff *skb2; | |
3674 | int err; | |
3675 | ||
3676 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
3677 | if (skb2 == NULL) | |
3678 | return -ENOMEM; | |
3679 | ||
3680 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
3681 | nlh->nlmsg_seq); | |
3682 | if (err < 0) | |
3683 | goto err; | |
3684 | ||
3685 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
3686 | err: | |
3687 | kfree_skb(skb2); | |
3688 | return err; | |
3689 | } | |
3690 | ||
96518518 PM |
3691 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
3692 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 3693 | .call_batch = nf_tables_newtable, |
96518518 PM |
3694 | .attr_count = NFTA_TABLE_MAX, |
3695 | .policy = nft_table_policy, | |
3696 | }, | |
3697 | [NFT_MSG_GETTABLE] = { | |
3698 | .call = nf_tables_gettable, | |
3699 | .attr_count = NFTA_TABLE_MAX, | |
3700 | .policy = nft_table_policy, | |
3701 | }, | |
3702 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 3703 | .call_batch = nf_tables_deltable, |
96518518 PM |
3704 | .attr_count = NFTA_TABLE_MAX, |
3705 | .policy = nft_table_policy, | |
3706 | }, | |
3707 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 3708 | .call_batch = nf_tables_newchain, |
96518518 PM |
3709 | .attr_count = NFTA_CHAIN_MAX, |
3710 | .policy = nft_chain_policy, | |
3711 | }, | |
3712 | [NFT_MSG_GETCHAIN] = { | |
3713 | .call = nf_tables_getchain, | |
3714 | .attr_count = NFTA_CHAIN_MAX, | |
3715 | .policy = nft_chain_policy, | |
3716 | }, | |
3717 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 3718 | .call_batch = nf_tables_delchain, |
96518518 PM |
3719 | .attr_count = NFTA_CHAIN_MAX, |
3720 | .policy = nft_chain_policy, | |
3721 | }, | |
3722 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 3723 | .call_batch = nf_tables_newrule, |
96518518 PM |
3724 | .attr_count = NFTA_RULE_MAX, |
3725 | .policy = nft_rule_policy, | |
3726 | }, | |
3727 | [NFT_MSG_GETRULE] = { | |
3728 | .call = nf_tables_getrule, | |
3729 | .attr_count = NFTA_RULE_MAX, | |
3730 | .policy = nft_rule_policy, | |
3731 | }, | |
3732 | [NFT_MSG_DELRULE] = { | |
0628b123 | 3733 | .call_batch = nf_tables_delrule, |
96518518 PM |
3734 | .attr_count = NFTA_RULE_MAX, |
3735 | .policy = nft_rule_policy, | |
3736 | }, | |
20a69341 | 3737 | [NFT_MSG_NEWSET] = { |
958bee14 | 3738 | .call_batch = nf_tables_newset, |
20a69341 PM |
3739 | .attr_count = NFTA_SET_MAX, |
3740 | .policy = nft_set_policy, | |
3741 | }, | |
3742 | [NFT_MSG_GETSET] = { | |
3743 | .call = nf_tables_getset, | |
3744 | .attr_count = NFTA_SET_MAX, | |
3745 | .policy = nft_set_policy, | |
3746 | }, | |
3747 | [NFT_MSG_DELSET] = { | |
958bee14 | 3748 | .call_batch = nf_tables_delset, |
20a69341 PM |
3749 | .attr_count = NFTA_SET_MAX, |
3750 | .policy = nft_set_policy, | |
3751 | }, | |
3752 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 3753 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
3754 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
3755 | .policy = nft_set_elem_list_policy, | |
3756 | }, | |
3757 | [NFT_MSG_GETSETELEM] = { | |
3758 | .call = nf_tables_getsetelem, | |
3759 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
3760 | .policy = nft_set_elem_list_policy, | |
3761 | }, | |
3762 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 3763 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
3764 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
3765 | .policy = nft_set_elem_list_policy, | |
3766 | }, | |
84d7fce6 PNA |
3767 | [NFT_MSG_GETGEN] = { |
3768 | .call = nf_tables_getgen, | |
3769 | }, | |
96518518 PM |
3770 | }; |
3771 | ||
91c7b38d PNA |
3772 | static void nft_chain_commit_update(struct nft_trans *trans) |
3773 | { | |
3774 | struct nft_base_chain *basechain; | |
3775 | ||
3776 | if (nft_trans_chain_name(trans)[0]) | |
3777 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); | |
3778 | ||
3779 | if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN)) | |
3780 | return; | |
3781 | ||
3782 | basechain = nft_base_chain(trans->ctx.chain); | |
3783 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
3784 | ||
3785 | switch (nft_trans_chain_policy(trans)) { | |
3786 | case NF_DROP: | |
3787 | case NF_ACCEPT: | |
3788 | basechain->policy = nft_trans_chain_policy(trans); | |
3789 | break; | |
3790 | } | |
3791 | } | |
3792 | ||
b326dd37 | 3793 | static void nf_tables_commit_release(struct nft_trans *trans) |
c7c32e72 | 3794 | { |
c7c32e72 PNA |
3795 | switch (trans->msg_type) { |
3796 | case NFT_MSG_DELTABLE: | |
3797 | nf_tables_table_destroy(&trans->ctx); | |
3798 | break; | |
3799 | case NFT_MSG_DELCHAIN: | |
3800 | nf_tables_chain_destroy(trans->ctx.chain); | |
3801 | break; | |
3802 | case NFT_MSG_DELRULE: | |
3803 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
3804 | break; | |
3805 | case NFT_MSG_DELSET: | |
3806 | nft_set_destroy(nft_trans_set(trans)); | |
3807 | break; | |
61edafbb PM |
3808 | case NFT_MSG_DELSETELEM: |
3809 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
3810 | nft_trans_elem(trans).priv); | |
3811 | break; | |
c7c32e72 PNA |
3812 | } |
3813 | kfree(trans); | |
3814 | } | |
3815 | ||
37082f93 PNA |
3816 | static int nf_tables_commit(struct sk_buff *skb) |
3817 | { | |
3818 | struct net *net = sock_net(skb->sk); | |
3819 | struct nft_trans *trans, *next; | |
a3716e70 | 3820 | struct nft_trans_elem *te; |
37082f93 PNA |
3821 | |
3822 | /* Bump generation counter, invalidate any dump in progress */ | |
38e029f1 | 3823 | while (++net->nft.base_seq == 0); |
37082f93 PNA |
3824 | |
3825 | /* A new generation has just started */ | |
ea4bd995 | 3826 | net->nft.gencursor = nft_gencursor_next(net); |
37082f93 PNA |
3827 | |
3828 | /* Make sure all packets have left the previous generation before | |
3829 | * purging old rules. | |
3830 | */ | |
3831 | synchronize_rcu(); | |
3832 | ||
3833 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 3834 | switch (trans->msg_type) { |
55dd6f93 PNA |
3835 | case NFT_MSG_NEWTABLE: |
3836 | if (nft_trans_table_update(trans)) { | |
3837 | if (!nft_trans_table_enable(trans)) { | |
3838 | nf_tables_table_disable(trans->ctx.afi, | |
3839 | trans->ctx.table); | |
3840 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
3841 | } | |
3842 | } else { | |
3843 | trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE; | |
3844 | } | |
35151d84 | 3845 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
3846 | nft_trans_destroy(trans); |
3847 | break; | |
3848 | case NFT_MSG_DELTABLE: | |
35151d84 | 3849 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 3850 | break; |
91c7b38d PNA |
3851 | case NFT_MSG_NEWCHAIN: |
3852 | if (nft_trans_chain_update(trans)) | |
3853 | nft_chain_commit_update(trans); | |
4fefee57 | 3854 | else |
91c7b38d | 3855 | trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE; |
4fefee57 | 3856 | |
35151d84 | 3857 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
3858 | nft_trans_destroy(trans); |
3859 | break; | |
3860 | case NFT_MSG_DELCHAIN: | |
35151d84 | 3861 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
c5598794 AB |
3862 | nf_tables_unregister_hooks(trans->ctx.table, |
3863 | trans->ctx.chain, | |
3864 | trans->ctx.afi->nops); | |
91c7b38d | 3865 | break; |
b380e5c7 PNA |
3866 | case NFT_MSG_NEWRULE: |
3867 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); | |
35151d84 | 3868 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 3869 | nft_trans_rule(trans), |
35151d84 | 3870 | NFT_MSG_NEWRULE); |
37082f93 | 3871 | nft_trans_destroy(trans); |
b380e5c7 PNA |
3872 | break; |
3873 | case NFT_MSG_DELRULE: | |
3874 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
3875 | nf_tables_rule_notify(&trans->ctx, |
3876 | nft_trans_rule(trans), | |
3877 | NFT_MSG_DELRULE); | |
b380e5c7 | 3878 | break; |
958bee14 PNA |
3879 | case NFT_MSG_NEWSET: |
3880 | nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE; | |
4fefee57 PNA |
3881 | /* This avoids hitting -EBUSY when deleting the table |
3882 | * from the transaction. | |
3883 | */ | |
3884 | if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS && | |
3885 | !list_empty(&nft_trans_set(trans)->bindings)) | |
3886 | trans->ctx.table->use--; | |
3887 | ||
958bee14 | 3888 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 3889 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
3890 | nft_trans_destroy(trans); |
3891 | break; | |
3892 | case NFT_MSG_DELSET: | |
3893 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), | |
31f8441c | 3894 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 3895 | break; |
60319eb1 | 3896 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
3897 | te = (struct nft_trans_elem *)trans->data; |
3898 | ||
3899 | te->set->ops->activate(te->set, &te->elem); | |
3900 | nf_tables_setelem_notify(&trans->ctx, te->set, | |
3901 | &te->elem, | |
60319eb1 PNA |
3902 | NFT_MSG_NEWSETELEM, 0); |
3903 | nft_trans_destroy(trans); | |
3904 | break; | |
3905 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 3906 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 3907 | |
a3716e70 PNA |
3908 | nf_tables_setelem_notify(&trans->ctx, te->set, |
3909 | &te->elem, | |
60319eb1 | 3910 | NFT_MSG_DELSETELEM, 0); |
02263db0 | 3911 | te->set->ops->remove(te->set, &te->elem); |
3dd0673a PM |
3912 | atomic_dec(&te->set->nelems); |
3913 | te->set->ndeact--; | |
60319eb1 | 3914 | break; |
37082f93 | 3915 | } |
37082f93 PNA |
3916 | } |
3917 | ||
b326dd37 PNA |
3918 | synchronize_rcu(); |
3919 | ||
37082f93 | 3920 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 | 3921 | list_del(&trans->list); |
b326dd37 | 3922 | nf_tables_commit_release(trans); |
37082f93 | 3923 | } |
84d7fce6 PNA |
3924 | |
3925 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); | |
37082f93 PNA |
3926 | |
3927 | return 0; | |
3928 | } | |
3929 | ||
b326dd37 | 3930 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 3931 | { |
c7c32e72 PNA |
3932 | switch (trans->msg_type) { |
3933 | case NFT_MSG_NEWTABLE: | |
3934 | nf_tables_table_destroy(&trans->ctx); | |
3935 | break; | |
3936 | case NFT_MSG_NEWCHAIN: | |
3937 | nf_tables_chain_destroy(trans->ctx.chain); | |
3938 | break; | |
3939 | case NFT_MSG_NEWRULE: | |
3940 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
3941 | break; | |
3942 | case NFT_MSG_NEWSET: | |
3943 | nft_set_destroy(nft_trans_set(trans)); | |
3944 | break; | |
61edafbb PM |
3945 | case NFT_MSG_NEWSETELEM: |
3946 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
3947 | nft_trans_elem(trans).priv); | |
3948 | break; | |
c7c32e72 PNA |
3949 | } |
3950 | kfree(trans); | |
3951 | } | |
3952 | ||
37082f93 PNA |
3953 | static int nf_tables_abort(struct sk_buff *skb) |
3954 | { | |
3955 | struct net *net = sock_net(skb->sk); | |
3956 | struct nft_trans *trans, *next; | |
02263db0 | 3957 | struct nft_trans_elem *te; |
37082f93 PNA |
3958 | |
3959 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 3960 | switch (trans->msg_type) { |
55dd6f93 PNA |
3961 | case NFT_MSG_NEWTABLE: |
3962 | if (nft_trans_table_update(trans)) { | |
3963 | if (nft_trans_table_enable(trans)) { | |
3964 | nf_tables_table_disable(trans->ctx.afi, | |
3965 | trans->ctx.table); | |
3966 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
3967 | } | |
3968 | nft_trans_destroy(trans); | |
3969 | } else { | |
e688a7f8 | 3970 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
3971 | } |
3972 | break; | |
3973 | case NFT_MSG_DELTABLE: | |
e688a7f8 PNA |
3974 | list_add_tail_rcu(&trans->ctx.table->list, |
3975 | &trans->ctx.afi->tables); | |
55dd6f93 PNA |
3976 | nft_trans_destroy(trans); |
3977 | break; | |
91c7b38d PNA |
3978 | case NFT_MSG_NEWCHAIN: |
3979 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 3980 | free_percpu(nft_trans_chain_stats(trans)); |
91c7b38d PNA |
3981 | |
3982 | nft_trans_destroy(trans); | |
3983 | } else { | |
4fefee57 | 3984 | trans->ctx.table->use--; |
e688a7f8 | 3985 | list_del_rcu(&trans->ctx.chain->list); |
c5598794 AB |
3986 | nf_tables_unregister_hooks(trans->ctx.table, |
3987 | trans->ctx.chain, | |
3988 | trans->ctx.afi->nops); | |
91c7b38d PNA |
3989 | } |
3990 | break; | |
3991 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 3992 | trans->ctx.table->use++; |
e688a7f8 PNA |
3993 | list_add_tail_rcu(&trans->ctx.chain->list, |
3994 | &trans->ctx.table->chains); | |
91c7b38d PNA |
3995 | nft_trans_destroy(trans); |
3996 | break; | |
b380e5c7 | 3997 | case NFT_MSG_NEWRULE: |
4fefee57 | 3998 | trans->ctx.chain->use--; |
b380e5c7 PNA |
3999 | list_del_rcu(&nft_trans_rule(trans)->list); |
4000 | break; | |
4001 | case NFT_MSG_DELRULE: | |
4fefee57 | 4002 | trans->ctx.chain->use++; |
b380e5c7 | 4003 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); |
37082f93 | 4004 | nft_trans_destroy(trans); |
b380e5c7 | 4005 | break; |
958bee14 | 4006 | case NFT_MSG_NEWSET: |
4fefee57 | 4007 | trans->ctx.table->use--; |
e688a7f8 | 4008 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
4009 | break; |
4010 | case NFT_MSG_DELSET: | |
4fefee57 | 4011 | trans->ctx.table->use++; |
e688a7f8 PNA |
4012 | list_add_tail_rcu(&nft_trans_set(trans)->list, |
4013 | &trans->ctx.table->sets); | |
958bee14 PNA |
4014 | nft_trans_destroy(trans); |
4015 | break; | |
60319eb1 | 4016 | case NFT_MSG_NEWSETELEM: |
02263db0 | 4017 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 4018 | |
02263db0 | 4019 | te->set->ops->remove(te->set, &te->elem); |
3dd0673a | 4020 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
4021 | break; |
4022 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
4023 | te = (struct nft_trans_elem *)trans->data; |
4024 | ||
cc02e457 | 4025 | te->set->ops->activate(te->set, &te->elem); |
3dd0673a | 4026 | te->set->ndeact--; |
cc02e457 | 4027 | |
60319eb1 PNA |
4028 | nft_trans_destroy(trans); |
4029 | break; | |
37082f93 | 4030 | } |
37082f93 PNA |
4031 | } |
4032 | ||
b326dd37 PNA |
4033 | synchronize_rcu(); |
4034 | ||
a1cee076 PNA |
4035 | list_for_each_entry_safe_reverse(trans, next, |
4036 | &net->nft.commit_list, list) { | |
c7c32e72 | 4037 | list_del(&trans->list); |
b326dd37 | 4038 | nf_tables_abort_release(trans); |
37082f93 PNA |
4039 | } |
4040 | ||
4041 | return 0; | |
4042 | } | |
4043 | ||
96518518 PM |
4044 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
4045 | .name = "nf_tables", | |
4046 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
4047 | .cb_count = NFT_MSG_MAX, | |
4048 | .cb = nf_tables_cb, | |
0628b123 PNA |
4049 | .commit = nf_tables_commit, |
4050 | .abort = nf_tables_abort, | |
96518518 PM |
4051 | }; |
4052 | ||
7210e4e3 PNA |
4053 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
4054 | enum nft_chain_type type) | |
4055 | { | |
4056 | const struct nft_base_chain *basechain; | |
4057 | ||
4058 | if (chain->flags & NFT_BASE_CHAIN) { | |
4059 | basechain = nft_base_chain(chain); | |
4060 | if (basechain->type->type != type) | |
4061 | return -EOPNOTSUPP; | |
4062 | } | |
4063 | return 0; | |
4064 | } | |
4065 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
4066 | ||
75e8d06d PNA |
4067 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
4068 | unsigned int hook_flags) | |
4069 | { | |
4070 | struct nft_base_chain *basechain; | |
4071 | ||
4072 | if (chain->flags & NFT_BASE_CHAIN) { | |
4073 | basechain = nft_base_chain(chain); | |
4074 | ||
4075 | if ((1 << basechain->ops[0].hooknum) & hook_flags) | |
4076 | return 0; | |
4077 | ||
4078 | return -EOPNOTSUPP; | |
4079 | } | |
4080 | ||
4081 | return 0; | |
4082 | } | |
4083 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
4084 | ||
20a69341 PM |
4085 | /* |
4086 | * Loop detection - walk through the ruleset beginning at the destination chain | |
4087 | * of a new jump until either the source chain is reached (loop) or all | |
4088 | * reachable chains have been traversed. | |
4089 | * | |
4090 | * The loop check is performed whenever a new jump verdict is added to an | |
4091 | * expression or verdict map or a verdict map is bound to a new chain. | |
4092 | */ | |
4093 | ||
4094 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
4095 | const struct nft_chain *chain); | |
4096 | ||
4097 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
4098 | const struct nft_set *set, | |
4099 | const struct nft_set_iter *iter, | |
4100 | const struct nft_set_elem *elem) | |
4101 | { | |
fe2811eb PM |
4102 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
4103 | const struct nft_data *data; | |
4104 | ||
4105 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
4106 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
4107 | return 0; |
4108 | ||
fe2811eb | 4109 | data = nft_set_ext_data(ext); |
1ca2e170 | 4110 | switch (data->verdict.code) { |
20a69341 PM |
4111 | case NFT_JUMP: |
4112 | case NFT_GOTO: | |
1ca2e170 | 4113 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
4114 | default: |
4115 | return 0; | |
4116 | } | |
4117 | } | |
4118 | ||
4119 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
4120 | const struct nft_chain *chain) | |
4121 | { | |
4122 | const struct nft_rule *rule; | |
4123 | const struct nft_expr *expr, *last; | |
20a69341 PM |
4124 | const struct nft_set *set; |
4125 | struct nft_set_binding *binding; | |
4126 | struct nft_set_iter iter; | |
20a69341 PM |
4127 | |
4128 | if (ctx->chain == chain) | |
4129 | return -ELOOP; | |
4130 | ||
4131 | list_for_each_entry(rule, &chain->rules, list) { | |
4132 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
4133 | const struct nft_data *data = NULL; |
4134 | int err; | |
4135 | ||
4136 | if (!expr->ops->validate) | |
20a69341 PM |
4137 | continue; |
4138 | ||
0ca743a5 PNA |
4139 | err = expr->ops->validate(ctx, expr, &data); |
4140 | if (err < 0) | |
4141 | return err; | |
4142 | ||
20a69341 | 4143 | if (data == NULL) |
0ca743a5 | 4144 | continue; |
20a69341 | 4145 | |
1ca2e170 | 4146 | switch (data->verdict.code) { |
20a69341 PM |
4147 | case NFT_JUMP: |
4148 | case NFT_GOTO: | |
1ca2e170 PM |
4149 | err = nf_tables_check_loops(ctx, |
4150 | data->verdict.chain); | |
20a69341 PM |
4151 | if (err < 0) |
4152 | return err; | |
4153 | default: | |
4154 | break; | |
4155 | } | |
4156 | } | |
4157 | } | |
4158 | ||
4159 | list_for_each_entry(set, &ctx->table->sets, list) { | |
4160 | if (!(set->flags & NFT_SET_MAP) || | |
4161 | set->dtype != NFT_DATA_VERDICT) | |
4162 | continue; | |
4163 | ||
4164 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
4165 | if (!(binding->flags & NFT_SET_MAP) || |
4166 | binding->chain != chain) | |
20a69341 PM |
4167 | continue; |
4168 | ||
4169 | iter.skip = 0; | |
4170 | iter.count = 0; | |
4171 | iter.err = 0; | |
4172 | iter.fn = nf_tables_loop_check_setelem; | |
4173 | ||
4174 | set->ops->walk(ctx, set, &iter); | |
4175 | if (iter.err < 0) | |
4176 | return iter.err; | |
4177 | } | |
4178 | } | |
4179 | ||
4180 | return 0; | |
4181 | } | |
4182 | ||
49499c3e PM |
4183 | /** |
4184 | * nft_parse_register - parse a register value from a netlink attribute | |
4185 | * | |
4186 | * @attr: netlink attribute | |
4187 | * | |
4188 | * Parse and translate a register value from a netlink attribute. | |
4189 | * Registers used to be 128 bit wide, these register numbers will be | |
4190 | * mapped to the corresponding 32 bit register numbers. | |
4191 | */ | |
b1c96ed3 PM |
4192 | unsigned int nft_parse_register(const struct nlattr *attr) |
4193 | { | |
49499c3e PM |
4194 | unsigned int reg; |
4195 | ||
4196 | reg = ntohl(nla_get_be32(attr)); | |
4197 | switch (reg) { | |
4198 | case NFT_REG_VERDICT...NFT_REG_4: | |
4199 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
4200 | default: | |
4201 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
4202 | } | |
b1c96ed3 PM |
4203 | } |
4204 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
4205 | ||
49499c3e PM |
4206 | /** |
4207 | * nft_dump_register - dump a register value to a netlink attribute | |
4208 | * | |
4209 | * @skb: socket buffer | |
4210 | * @attr: attribute number | |
4211 | * @reg: register number | |
4212 | * | |
4213 | * Construct a netlink attribute containing the register number. For | |
4214 | * compatibility reasons, register numbers being a multiple of 4 are | |
4215 | * translated to the corresponding 128 bit register numbers. | |
4216 | */ | |
b1c96ed3 PM |
4217 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
4218 | { | |
49499c3e PM |
4219 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
4220 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
4221 | else | |
4222 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
4223 | ||
b1c96ed3 PM |
4224 | return nla_put_be32(skb, attr, htonl(reg)); |
4225 | } | |
4226 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
4227 | ||
96518518 | 4228 | /** |
d07db988 | 4229 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
4230 | * |
4231 | * @reg: the register number | |
d07db988 | 4232 | * @len: the length of the data |
96518518 PM |
4233 | * |
4234 | * Validate that the input register is one of the general purpose | |
d07db988 | 4235 | * registers and that the length of the load is within the bounds. |
96518518 | 4236 | */ |
d07db988 | 4237 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 4238 | { |
49499c3e | 4239 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 4240 | return -EINVAL; |
d07db988 PM |
4241 | if (len == 0) |
4242 | return -EINVAL; | |
49499c3e | 4243 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 4244 | return -ERANGE; |
49499c3e | 4245 | |
96518518 PM |
4246 | return 0; |
4247 | } | |
d07db988 | 4248 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 4249 | |
96518518 | 4250 | /** |
1ec10212 | 4251 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
4252 | * |
4253 | * @ctx: context of the expression performing the load | |
4254 | * @reg: the destination register number | |
4255 | * @data: the data to load | |
4256 | * @type: the data type | |
45d9bcda | 4257 | * @len: the length of the data |
96518518 PM |
4258 | * |
4259 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
4260 | * the destination register and the length is within the bounds. |
4261 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 4262 | * data. |
96518518 | 4263 | */ |
1ec10212 PM |
4264 | int nft_validate_register_store(const struct nft_ctx *ctx, |
4265 | enum nft_registers reg, | |
4266 | const struct nft_data *data, | |
4267 | enum nft_data_types type, unsigned int len) | |
96518518 | 4268 | { |
20a69341 PM |
4269 | int err; |
4270 | ||
96518518 PM |
4271 | switch (reg) { |
4272 | case NFT_REG_VERDICT: | |
58f40ab6 | 4273 | if (type != NFT_DATA_VERDICT) |
96518518 | 4274 | return -EINVAL; |
20a69341 | 4275 | |
58f40ab6 | 4276 | if (data != NULL && |
1ca2e170 PM |
4277 | (data->verdict.code == NFT_GOTO || |
4278 | data->verdict.code == NFT_JUMP)) { | |
4279 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
4280 | if (err < 0) |
4281 | return err; | |
4282 | ||
1ca2e170 PM |
4283 | if (ctx->chain->level + 1 > |
4284 | data->verdict.chain->level) { | |
20a69341 PM |
4285 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
4286 | return -EMLINK; | |
1ca2e170 | 4287 | data->verdict.chain->level = ctx->chain->level + 1; |
20a69341 PM |
4288 | } |
4289 | } | |
4290 | ||
96518518 PM |
4291 | return 0; |
4292 | default: | |
49499c3e | 4293 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 4294 | return -EINVAL; |
45d9bcda PM |
4295 | if (len == 0) |
4296 | return -EINVAL; | |
49499c3e PM |
4297 | if (reg * NFT_REG32_SIZE + len > |
4298 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 4299 | return -ERANGE; |
27e6d201 | 4300 | |
96518518 PM |
4301 | if (data != NULL && type != NFT_DATA_VALUE) |
4302 | return -EINVAL; | |
4303 | return 0; | |
4304 | } | |
4305 | } | |
1ec10212 | 4306 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
4307 | |
4308 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
4309 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
4310 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
4311 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
4312 | }; | |
4313 | ||
4314 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
4315 | struct nft_data_desc *desc, const struct nlattr *nla) | |
4316 | { | |
4317 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; | |
4318 | struct nft_chain *chain; | |
4319 | int err; | |
4320 | ||
4321 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); | |
4322 | if (err < 0) | |
4323 | return err; | |
4324 | ||
4325 | if (!tb[NFTA_VERDICT_CODE]) | |
4326 | return -EINVAL; | |
1ca2e170 | 4327 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 4328 | |
1ca2e170 | 4329 | switch (data->verdict.code) { |
e0abdadc | 4330 | default: |
1ca2e170 | 4331 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
4332 | case NF_ACCEPT: |
4333 | case NF_DROP: | |
4334 | case NF_QUEUE: | |
4335 | break; | |
4336 | default: | |
4337 | return -EINVAL; | |
4338 | } | |
4339 | /* fall through */ | |
96518518 PM |
4340 | case NFT_CONTINUE: |
4341 | case NFT_BREAK: | |
4342 | case NFT_RETURN: | |
96518518 PM |
4343 | break; |
4344 | case NFT_JUMP: | |
4345 | case NFT_GOTO: | |
4346 | if (!tb[NFTA_VERDICT_CHAIN]) | |
4347 | return -EINVAL; | |
4348 | chain = nf_tables_chain_lookup(ctx->table, | |
4349 | tb[NFTA_VERDICT_CHAIN]); | |
4350 | if (IS_ERR(chain)) | |
4351 | return PTR_ERR(chain); | |
4352 | if (chain->flags & NFT_BASE_CHAIN) | |
4353 | return -EOPNOTSUPP; | |
4354 | ||
96518518 | 4355 | chain->use++; |
1ca2e170 | 4356 | data->verdict.chain = chain; |
96518518 | 4357 | break; |
96518518 PM |
4358 | } |
4359 | ||
4c4ed074 | 4360 | desc->len = sizeof(data->verdict); |
96518518 PM |
4361 | desc->type = NFT_DATA_VERDICT; |
4362 | return 0; | |
4363 | } | |
4364 | ||
4365 | static void nft_verdict_uninit(const struct nft_data *data) | |
4366 | { | |
1ca2e170 | 4367 | switch (data->verdict.code) { |
96518518 PM |
4368 | case NFT_JUMP: |
4369 | case NFT_GOTO: | |
1ca2e170 | 4370 | data->verdict.chain->use--; |
96518518 PM |
4371 | break; |
4372 | } | |
4373 | } | |
4374 | ||
4375 | static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) | |
4376 | { | |
4377 | struct nlattr *nest; | |
4378 | ||
4379 | nest = nla_nest_start(skb, NFTA_DATA_VERDICT); | |
4380 | if (!nest) | |
4381 | goto nla_put_failure; | |
4382 | ||
1ca2e170 | 4383 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict.code))) |
96518518 PM |
4384 | goto nla_put_failure; |
4385 | ||
1ca2e170 | 4386 | switch (data->verdict.code) { |
96518518 PM |
4387 | case NFT_JUMP: |
4388 | case NFT_GOTO: | |
1ca2e170 PM |
4389 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
4390 | data->verdict.chain->name)) | |
96518518 PM |
4391 | goto nla_put_failure; |
4392 | } | |
4393 | nla_nest_end(skb, nest); | |
4394 | return 0; | |
4395 | ||
4396 | nla_put_failure: | |
4397 | return -1; | |
4398 | } | |
4399 | ||
d0a11fc3 PM |
4400 | static int nft_value_init(const struct nft_ctx *ctx, |
4401 | struct nft_data *data, unsigned int size, | |
96518518 PM |
4402 | struct nft_data_desc *desc, const struct nlattr *nla) |
4403 | { | |
4404 | unsigned int len; | |
4405 | ||
4406 | len = nla_len(nla); | |
4407 | if (len == 0) | |
4408 | return -EINVAL; | |
d0a11fc3 | 4409 | if (len > size) |
96518518 PM |
4410 | return -EOVERFLOW; |
4411 | ||
d0a11fc3 | 4412 | nla_memcpy(data->data, nla, len); |
96518518 PM |
4413 | desc->type = NFT_DATA_VALUE; |
4414 | desc->len = len; | |
4415 | return 0; | |
4416 | } | |
4417 | ||
4418 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
4419 | unsigned int len) | |
4420 | { | |
4421 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
4422 | } | |
4423 | ||
4424 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 4425 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
4426 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
4427 | }; | |
4428 | ||
4429 | /** | |
4430 | * nft_data_init - parse nf_tables data netlink attributes | |
4431 | * | |
4432 | * @ctx: context of the expression using the data | |
4433 | * @data: destination struct nft_data | |
d0a11fc3 | 4434 | * @size: maximum data length |
96518518 PM |
4435 | * @desc: data description |
4436 | * @nla: netlink attribute containing data | |
4437 | * | |
4438 | * Parse the netlink data attributes and initialize a struct nft_data. | |
4439 | * The type and length of data are returned in the data description. | |
4440 | * | |
4441 | * The caller can indicate that it only wants to accept data of type | |
4442 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
4443 | */ | |
d0a11fc3 PM |
4444 | int nft_data_init(const struct nft_ctx *ctx, |
4445 | struct nft_data *data, unsigned int size, | |
96518518 PM |
4446 | struct nft_data_desc *desc, const struct nlattr *nla) |
4447 | { | |
4448 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
4449 | int err; | |
4450 | ||
4451 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); | |
4452 | if (err < 0) | |
4453 | return err; | |
4454 | ||
4455 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
4456 | return nft_value_init(ctx, data, size, desc, |
4457 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
4458 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
4459 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
4460 | return -EINVAL; | |
4461 | } | |
4462 | EXPORT_SYMBOL_GPL(nft_data_init); | |
4463 | ||
4464 | /** | |
4465 | * nft_data_uninit - release a nft_data item | |
4466 | * | |
4467 | * @data: struct nft_data to release | |
4468 | * @type: type of data | |
4469 | * | |
4470 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
4471 | * all others need to be released by calling this function. | |
4472 | */ | |
4473 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) | |
4474 | { | |
960bd2c2 | 4475 | if (type < NFT_DATA_VERDICT) |
96518518 | 4476 | return; |
960bd2c2 | 4477 | switch (type) { |
96518518 PM |
4478 | case NFT_DATA_VERDICT: |
4479 | return nft_verdict_uninit(data); | |
4480 | default: | |
4481 | WARN_ON(1); | |
4482 | } | |
4483 | } | |
4484 | EXPORT_SYMBOL_GPL(nft_data_uninit); | |
4485 | ||
4486 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
4487 | enum nft_data_types type, unsigned int len) | |
4488 | { | |
4489 | struct nlattr *nest; | |
4490 | int err; | |
4491 | ||
4492 | nest = nla_nest_start(skb, attr); | |
4493 | if (nest == NULL) | |
4494 | return -1; | |
4495 | ||
4496 | switch (type) { | |
4497 | case NFT_DATA_VALUE: | |
4498 | err = nft_value_dump(skb, data, len); | |
4499 | break; | |
4500 | case NFT_DATA_VERDICT: | |
4501 | err = nft_verdict_dump(skb, data); | |
4502 | break; | |
4503 | default: | |
4504 | err = -EINVAL; | |
4505 | WARN_ON(1); | |
4506 | } | |
4507 | ||
4508 | nla_nest_end(skb, nest); | |
4509 | return err; | |
4510 | } | |
4511 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
4512 | ||
99633ab2 PNA |
4513 | static int nf_tables_init_net(struct net *net) |
4514 | { | |
4515 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 4516 | INIT_LIST_HEAD(&net->nft.commit_list); |
38e029f1 | 4517 | net->nft.base_seq = 1; |
99633ab2 PNA |
4518 | return 0; |
4519 | } | |
4520 | ||
4521 | static struct pernet_operations nf_tables_net_ops = { | |
4522 | .init = nf_tables_init_net, | |
4523 | }; | |
4524 | ||
96518518 PM |
4525 | static int __init nf_tables_module_init(void) |
4526 | { | |
4527 | int err; | |
4528 | ||
4529 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
4530 | GFP_KERNEL); | |
4531 | if (info == NULL) { | |
4532 | err = -ENOMEM; | |
4533 | goto err1; | |
4534 | } | |
4535 | ||
4536 | err = nf_tables_core_module_init(); | |
4537 | if (err < 0) | |
4538 | goto err2; | |
4539 | ||
4540 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
4541 | if (err < 0) | |
4542 | goto err3; | |
4543 | ||
4544 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 4545 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
4546 | err3: |
4547 | nf_tables_core_module_exit(); | |
4548 | err2: | |
4549 | kfree(info); | |
4550 | err1: | |
4551 | return err; | |
4552 | } | |
4553 | ||
4554 | static void __exit nf_tables_module_exit(void) | |
4555 | { | |
99633ab2 | 4556 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 | 4557 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
1b1bc49c | 4558 | rcu_barrier(); |
96518518 PM |
4559 | nf_tables_core_module_exit(); |
4560 | kfree(info); | |
4561 | } | |
4562 | ||
4563 | module_init(nf_tables_module_init); | |
4564 | module_exit(nf_tables_module_exit); | |
4565 | ||
4566 | MODULE_LICENSE("GPL"); | |
4567 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
4568 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |