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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 | ||
df05ef87 PNA |
44 | static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi); |
45 | ||
96518518 PM |
46 | /** |
47 | * nft_unregister_afinfo - unregister nf_tables address family info | |
48 | * | |
49 | * @afi: address family info to unregister | |
50 | * | |
51 | * Unregister the address family for use with nf_tables. | |
52 | */ | |
df05ef87 | 53 | void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi) |
96518518 PM |
54 | { |
55 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
df05ef87 | 56 | __nft_release_afinfo(net, afi); |
e688a7f8 | 57 | list_del_rcu(&afi->list); |
96518518 PM |
58 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
59 | } | |
60 | EXPORT_SYMBOL_GPL(nft_unregister_afinfo); | |
61 | ||
99633ab2 | 62 | static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family) |
96518518 PM |
63 | { |
64 | struct nft_af_info *afi; | |
65 | ||
99633ab2 | 66 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
67 | if (afi->family == family) |
68 | return afi; | |
69 | } | |
70 | return NULL; | |
71 | } | |
72 | ||
99633ab2 PNA |
73 | static struct nft_af_info * |
74 | nf_tables_afinfo_lookup(struct net *net, int family, bool autoload) | |
96518518 PM |
75 | { |
76 | struct nft_af_info *afi; | |
77 | ||
99633ab2 | 78 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
79 | if (afi != NULL) |
80 | return afi; | |
81 | #ifdef CONFIG_MODULES | |
82 | if (autoload) { | |
83 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
84 | request_module("nft-afinfo-%u", family); | |
85 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
99633ab2 | 86 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
87 | if (afi != NULL) |
88 | return ERR_PTR(-EAGAIN); | |
89 | } | |
90 | #endif | |
91 | return ERR_PTR(-EAFNOSUPPORT); | |
92 | } | |
93 | ||
7c95f6d8 | 94 | static void nft_ctx_init(struct nft_ctx *ctx, |
633c9a84 | 95 | struct net *net, |
7c95f6d8 PNA |
96 | const struct sk_buff *skb, |
97 | const struct nlmsghdr *nlh, | |
98 | struct nft_af_info *afi, | |
99 | struct nft_table *table, | |
100 | struct nft_chain *chain, | |
101 | const struct nlattr * const *nla) | |
102 | { | |
633c9a84 | 103 | ctx->net = net; |
128ad332 PNA |
104 | ctx->afi = afi; |
105 | ctx->table = table; | |
106 | ctx->chain = chain; | |
107 | ctx->nla = nla; | |
108 | ctx->portid = NETLINK_CB(skb).portid; | |
109 | ctx->report = nlmsg_report(nlh); | |
110 | ctx->seq = nlh->nlmsg_seq; | |
7c95f6d8 PNA |
111 | } |
112 | ||
b380e5c7 PNA |
113 | static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type, |
114 | u32 size) | |
1081d11b PNA |
115 | { |
116 | struct nft_trans *trans; | |
117 | ||
118 | trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL); | |
119 | if (trans == NULL) | |
120 | return NULL; | |
121 | ||
b380e5c7 | 122 | trans->msg_type = msg_type; |
1081d11b PNA |
123 | trans->ctx = *ctx; |
124 | ||
125 | return trans; | |
126 | } | |
127 | ||
128 | static void nft_trans_destroy(struct nft_trans *trans) | |
129 | { | |
130 | list_del(&trans->list); | |
131 | kfree(trans); | |
132 | } | |
133 | ||
5ebe0b0e PNA |
134 | static int nft_register_basechain(struct nft_base_chain *basechain, |
135 | unsigned int hook_nops) | |
d8ee8f7c | 136 | { |
fd2ecda0 EB |
137 | struct net *net = read_pnet(&basechain->pnet); |
138 | ||
835b8033 PNA |
139 | if (basechain->flags & NFT_BASECHAIN_DISABLED) |
140 | return 0; | |
141 | ||
fd2ecda0 | 142 | return nf_register_net_hooks(net, basechain->ops, hook_nops); |
d8ee8f7c PNA |
143 | } |
144 | ||
5ebe0b0e PNA |
145 | static void nft_unregister_basechain(struct nft_base_chain *basechain, |
146 | unsigned int hook_nops) | |
d8ee8f7c | 147 | { |
fd2ecda0 EB |
148 | struct net *net = read_pnet(&basechain->pnet); |
149 | ||
835b8033 PNA |
150 | if (basechain->flags & NFT_BASECHAIN_DISABLED) |
151 | return; | |
152 | ||
fd2ecda0 | 153 | nf_unregister_net_hooks(net, basechain->ops, hook_nops); |
d8ee8f7c PNA |
154 | } |
155 | ||
156 | static int nf_tables_register_hooks(const struct nft_table *table, | |
157 | struct nft_chain *chain, | |
158 | unsigned int hook_nops) | |
159 | { | |
160 | if (table->flags & NFT_TABLE_F_DORMANT || | |
161 | !(chain->flags & NFT_BASE_CHAIN)) | |
162 | return 0; | |
163 | ||
164 | return nft_register_basechain(nft_base_chain(chain), hook_nops); | |
165 | } | |
166 | ||
c5598794 | 167 | static void nf_tables_unregister_hooks(const struct nft_table *table, |
d8ee8f7c | 168 | struct nft_chain *chain, |
c5598794 AB |
169 | unsigned int hook_nops) |
170 | { | |
d8ee8f7c PNA |
171 | if (table->flags & NFT_TABLE_F_DORMANT || |
172 | !(chain->flags & NFT_BASE_CHAIN)) | |
173 | return; | |
174 | ||
175 | nft_unregister_basechain(nft_base_chain(chain), hook_nops); | |
c5598794 AB |
176 | } |
177 | ||
ee01d542 AB |
178 | static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) |
179 | { | |
180 | struct nft_trans *trans; | |
181 | ||
182 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); | |
183 | if (trans == NULL) | |
184 | return -ENOMEM; | |
185 | ||
186 | if (msg_type == NFT_MSG_NEWTABLE) | |
f2a6d766 | 187 | nft_activate_next(ctx->net, ctx->table); |
ee01d542 AB |
188 | |
189 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static int nft_deltable(struct nft_ctx *ctx) | |
194 | { | |
195 | int err; | |
196 | ||
197 | err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); | |
198 | if (err < 0) | |
199 | return err; | |
200 | ||
f2a6d766 | 201 | nft_deactivate_next(ctx->net, ctx->table); |
ee01d542 AB |
202 | return err; |
203 | } | |
204 | ||
205 | static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) | |
206 | { | |
207 | struct nft_trans *trans; | |
208 | ||
209 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); | |
210 | if (trans == NULL) | |
211 | return -ENOMEM; | |
212 | ||
213 | if (msg_type == NFT_MSG_NEWCHAIN) | |
214 | ctx->chain->flags |= NFT_CHAIN_INACTIVE; | |
215 | ||
216 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
217 | return 0; | |
218 | } | |
219 | ||
220 | static int nft_delchain(struct nft_ctx *ctx) | |
221 | { | |
222 | int err; | |
223 | ||
224 | err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); | |
225 | if (err < 0) | |
226 | return err; | |
227 | ||
228 | ctx->table->use--; | |
229 | list_del_rcu(&ctx->chain->list); | |
230 | ||
231 | return err; | |
232 | } | |
233 | ||
ee01d542 AB |
234 | static int |
235 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) | |
236 | { | |
237 | /* You cannot delete the same rule twice */ | |
889f7ee7 PNA |
238 | if (nft_is_active_next(ctx->net, rule)) { |
239 | nft_deactivate_next(ctx->net, rule); | |
ee01d542 AB |
240 | ctx->chain->use--; |
241 | return 0; | |
242 | } | |
243 | return -ENOENT; | |
244 | } | |
245 | ||
246 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, | |
247 | struct nft_rule *rule) | |
248 | { | |
249 | struct nft_trans *trans; | |
250 | ||
251 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); | |
252 | if (trans == NULL) | |
253 | return NULL; | |
254 | ||
255 | nft_trans_rule(trans) = rule; | |
256 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
257 | ||
258 | return trans; | |
259 | } | |
260 | ||
261 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) | |
262 | { | |
263 | struct nft_trans *trans; | |
264 | int err; | |
265 | ||
266 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); | |
267 | if (trans == NULL) | |
268 | return -ENOMEM; | |
269 | ||
270 | err = nf_tables_delrule_deactivate(ctx, rule); | |
271 | if (err < 0) { | |
272 | nft_trans_destroy(trans); | |
273 | return err; | |
274 | } | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | static int nft_delrule_by_chain(struct nft_ctx *ctx) | |
280 | { | |
281 | struct nft_rule *rule; | |
282 | int err; | |
283 | ||
284 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
285 | err = nft_delrule(ctx, rule); | |
286 | if (err < 0) | |
287 | return err; | |
288 | } | |
289 | return 0; | |
290 | } | |
291 | ||
292 | /* Internal set flag */ | |
293 | #define NFT_SET_INACTIVE (1 << 15) | |
294 | ||
295 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, | |
296 | struct nft_set *set) | |
297 | { | |
298 | struct nft_trans *trans; | |
299 | ||
300 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); | |
301 | if (trans == NULL) | |
302 | return -ENOMEM; | |
303 | ||
304 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { | |
305 | nft_trans_set_id(trans) = | |
306 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); | |
307 | set->flags |= NFT_SET_INACTIVE; | |
308 | } | |
309 | nft_trans_set(trans) = set; | |
310 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
315 | static int nft_delset(struct nft_ctx *ctx, struct nft_set *set) | |
316 | { | |
317 | int err; | |
318 | ||
319 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); | |
320 | if (err < 0) | |
321 | return err; | |
322 | ||
323 | list_del_rcu(&set->list); | |
324 | ctx->table->use--; | |
325 | ||
326 | return err; | |
327 | } | |
328 | ||
96518518 PM |
329 | /* |
330 | * Tables | |
331 | */ | |
332 | ||
333 | static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, | |
f2a6d766 PNA |
334 | const struct nlattr *nla, |
335 | u8 genmask) | |
96518518 PM |
336 | { |
337 | struct nft_table *table; | |
338 | ||
339 | list_for_each_entry(table, &afi->tables, list) { | |
f2a6d766 PNA |
340 | if (!nla_strcmp(nla, table->name) && |
341 | nft_active_genmask(table, genmask)) | |
96518518 PM |
342 | return table; |
343 | } | |
344 | return NULL; | |
345 | } | |
346 | ||
347 | static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, | |
f2a6d766 PNA |
348 | const struct nlattr *nla, |
349 | u8 genmask) | |
96518518 PM |
350 | { |
351 | struct nft_table *table; | |
352 | ||
353 | if (nla == NULL) | |
354 | return ERR_PTR(-EINVAL); | |
355 | ||
f2a6d766 | 356 | table = nft_table_lookup(afi, nla, genmask); |
96518518 PM |
357 | if (table != NULL) |
358 | return table; | |
359 | ||
96518518 PM |
360 | return ERR_PTR(-ENOENT); |
361 | } | |
362 | ||
363 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) | |
364 | { | |
365 | return ++table->hgenerator; | |
366 | } | |
367 | ||
2a37d755 | 368 | static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX]; |
9370761c | 369 | |
2a37d755 | 370 | static const struct nf_chain_type * |
baae3e62 | 371 | __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
9370761c PNA |
372 | { |
373 | int i; | |
374 | ||
baae3e62 | 375 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
376 | if (chain_type[family][i] != NULL && |
377 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 378 | return chain_type[family][i]; |
9370761c | 379 | } |
baae3e62 | 380 | return NULL; |
9370761c PNA |
381 | } |
382 | ||
2a37d755 | 383 | static const struct nf_chain_type * |
baae3e62 PM |
384 | nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
385 | const struct nlattr *nla, | |
386 | bool autoload) | |
9370761c | 387 | { |
2a37d755 | 388 | const struct nf_chain_type *type; |
9370761c PNA |
389 | |
390 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
391 | if (type != NULL) |
392 | return type; | |
9370761c | 393 | #ifdef CONFIG_MODULES |
93b0806f | 394 | if (autoload) { |
9370761c | 395 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2fec6bb6 PNA |
396 | request_module("nft-chain-%u-%.*s", afi->family, |
397 | nla_len(nla), (const char *)nla_data(nla)); | |
9370761c PNA |
398 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
399 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
400 | if (type != NULL) |
401 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
402 | } |
403 | #endif | |
93b0806f | 404 | return ERR_PTR(-ENOENT); |
9370761c PNA |
405 | } |
406 | ||
96518518 | 407 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
1cae565e PNA |
408 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
409 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
9ddf6323 | 410 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
411 | }; |
412 | ||
84d7fce6 PNA |
413 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
414 | u32 portid, u32 seq, int event, u32 flags, | |
415 | int family, const struct nft_table *table) | |
96518518 PM |
416 | { |
417 | struct nlmsghdr *nlh; | |
418 | struct nfgenmsg *nfmsg; | |
419 | ||
420 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
421 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
422 | if (nlh == NULL) | |
423 | goto nla_put_failure; | |
424 | ||
425 | nfmsg = nlmsg_data(nlh); | |
426 | nfmsg->nfgen_family = family; | |
427 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 428 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 | 429 | |
9ddf6323 | 430 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 TB |
431 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
432 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) | |
96518518 PM |
433 | goto nla_put_failure; |
434 | ||
053c095a JB |
435 | nlmsg_end(skb, nlh); |
436 | return 0; | |
96518518 PM |
437 | |
438 | nla_put_failure: | |
439 | nlmsg_trim(skb, nlh); | |
440 | return -1; | |
441 | } | |
442 | ||
35151d84 | 443 | static int nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
444 | { |
445 | struct sk_buff *skb; | |
96518518 PM |
446 | int err; |
447 | ||
128ad332 PNA |
448 | if (!ctx->report && |
449 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
450 | return 0; |
451 | ||
452 | err = -ENOBUFS; | |
453 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
454 | if (skb == NULL) | |
455 | goto err; | |
456 | ||
84d7fce6 PNA |
457 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
458 | event, 0, ctx->afi->family, ctx->table); | |
96518518 PM |
459 | if (err < 0) { |
460 | kfree_skb(skb); | |
461 | goto err; | |
462 | } | |
463 | ||
128ad332 PNA |
464 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
465 | ctx->report, GFP_KERNEL); | |
96518518 | 466 | err: |
128ad332 PNA |
467 | if (err < 0) { |
468 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
469 | err); | |
470 | } | |
96518518 PM |
471 | return err; |
472 | } | |
473 | ||
474 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
475 | struct netlink_callback *cb) | |
476 | { | |
477 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
478 | const struct nft_af_info *afi; | |
479 | const struct nft_table *table; | |
480 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 481 | struct net *net = sock_net(skb->sk); |
96518518 PM |
482 | int family = nfmsg->nfgen_family; |
483 | ||
e688a7f8 | 484 | rcu_read_lock(); |
38e029f1 PNA |
485 | cb->seq = net->nft.base_seq; |
486 | ||
e688a7f8 | 487 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
488 | if (family != NFPROTO_UNSPEC && family != afi->family) |
489 | continue; | |
490 | ||
e688a7f8 | 491 | list_for_each_entry_rcu(table, &afi->tables, list) { |
96518518 PM |
492 | if (idx < s_idx) |
493 | goto cont; | |
494 | if (idx > s_idx) | |
495 | memset(&cb->args[1], 0, | |
496 | sizeof(cb->args) - sizeof(cb->args[0])); | |
f2a6d766 PNA |
497 | if (!nft_is_active(net, table)) |
498 | continue; | |
84d7fce6 | 499 | if (nf_tables_fill_table_info(skb, net, |
96518518 PM |
500 | NETLINK_CB(cb->skb).portid, |
501 | cb->nlh->nlmsg_seq, | |
502 | NFT_MSG_NEWTABLE, | |
503 | NLM_F_MULTI, | |
504 | afi->family, table) < 0) | |
505 | goto done; | |
38e029f1 PNA |
506 | |
507 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
508 | cont: |
509 | idx++; | |
510 | } | |
511 | } | |
512 | done: | |
e688a7f8 | 513 | rcu_read_unlock(); |
96518518 PM |
514 | cb->args[0] = idx; |
515 | return skb->len; | |
516 | } | |
517 | ||
7b8002a1 PNA |
518 | static int nf_tables_gettable(struct net *net, struct sock *nlsk, |
519 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
520 | const struct nlattr * const nla[]) |
521 | { | |
522 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 523 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
524 | const struct nft_af_info *afi; |
525 | const struct nft_table *table; | |
526 | struct sk_buff *skb2; | |
527 | int family = nfmsg->nfgen_family; | |
528 | int err; | |
529 | ||
530 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
531 | struct netlink_dump_control c = { | |
532 | .dump = nf_tables_dump_tables, | |
533 | }; | |
534 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
535 | } | |
536 | ||
99633ab2 | 537 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
538 | if (IS_ERR(afi)) |
539 | return PTR_ERR(afi); | |
540 | ||
f2a6d766 | 541 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
542 | if (IS_ERR(table)) |
543 | return PTR_ERR(table); | |
544 | ||
545 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
546 | if (!skb2) | |
547 | return -ENOMEM; | |
548 | ||
84d7fce6 | 549 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
550 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
551 | family, table); | |
552 | if (err < 0) | |
553 | goto err; | |
554 | ||
555 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
556 | ||
557 | err: | |
558 | kfree_skb(skb2); | |
559 | return err; | |
560 | } | |
561 | ||
115a60b1 PM |
562 | static int nf_tables_table_enable(const struct nft_af_info *afi, |
563 | struct nft_table *table) | |
9ddf6323 PNA |
564 | { |
565 | struct nft_chain *chain; | |
566 | int err, i = 0; | |
567 | ||
568 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
569 | if (!(chain->flags & NFT_BASE_CHAIN)) |
570 | continue; | |
571 | ||
d8ee8f7c | 572 | err = nft_register_basechain(nft_base_chain(chain), afi->nops); |
9ddf6323 PNA |
573 | if (err < 0) |
574 | goto err; | |
575 | ||
576 | i++; | |
577 | } | |
578 | return 0; | |
579 | err: | |
580 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
581 | if (!(chain->flags & NFT_BASE_CHAIN)) |
582 | continue; | |
583 | ||
9ddf6323 PNA |
584 | if (i-- <= 0) |
585 | break; | |
586 | ||
d8ee8f7c | 587 | nft_unregister_basechain(nft_base_chain(chain), afi->nops); |
9ddf6323 PNA |
588 | } |
589 | return err; | |
590 | } | |
591 | ||
f75edf5e | 592 | static void nf_tables_table_disable(const struct nft_af_info *afi, |
d8ee8f7c | 593 | struct nft_table *table) |
9ddf6323 PNA |
594 | { |
595 | struct nft_chain *chain; | |
596 | ||
d2012975 PNA |
597 | list_for_each_entry(chain, &table->chains, list) { |
598 | if (chain->flags & NFT_BASE_CHAIN) | |
d8ee8f7c PNA |
599 | nft_unregister_basechain(nft_base_chain(chain), |
600 | afi->nops); | |
d2012975 | 601 | } |
9ddf6323 PNA |
602 | } |
603 | ||
e1aaca93 | 604 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 605 | { |
55dd6f93 | 606 | struct nft_trans *trans; |
e1aaca93 | 607 | u32 flags; |
55dd6f93 | 608 | int ret = 0; |
9ddf6323 | 609 | |
e1aaca93 PNA |
610 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
611 | return 0; | |
9ddf6323 | 612 | |
e1aaca93 PNA |
613 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
614 | if (flags & ~NFT_TABLE_F_DORMANT) | |
615 | return -EINVAL; | |
616 | ||
63283dd2 PNA |
617 | if (flags == ctx->table->flags) |
618 | return 0; | |
619 | ||
55dd6f93 PNA |
620 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
621 | sizeof(struct nft_trans_table)); | |
622 | if (trans == NULL) | |
623 | return -ENOMEM; | |
9ddf6323 | 624 | |
e1aaca93 PNA |
625 | if ((flags & NFT_TABLE_F_DORMANT) && |
626 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 627 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
628 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
629 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
630 | ret = nf_tables_table_enable(ctx->afi, ctx->table); | |
55dd6f93 | 631 | if (ret >= 0) { |
e1aaca93 | 632 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 633 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 634 | } |
9ddf6323 | 635 | } |
e1aaca93 PNA |
636 | if (ret < 0) |
637 | goto err; | |
9ddf6323 | 638 | |
55dd6f93 PNA |
639 | nft_trans_table_update(trans) = true; |
640 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
641 | return 0; | |
9ddf6323 | 642 | err: |
55dd6f93 | 643 | nft_trans_destroy(trans); |
9ddf6323 PNA |
644 | return ret; |
645 | } | |
646 | ||
633c9a84 PNA |
647 | static int nf_tables_newtable(struct net *net, struct sock *nlsk, |
648 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
649 | const struct nlattr * const nla[]) |
650 | { | |
651 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 652 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
653 | const struct nlattr *name; |
654 | struct nft_af_info *afi; | |
655 | struct nft_table *table; | |
656 | int family = nfmsg->nfgen_family; | |
c5c1f975 | 657 | u32 flags = 0; |
e1aaca93 | 658 | struct nft_ctx ctx; |
55dd6f93 | 659 | int err; |
96518518 | 660 | |
99633ab2 | 661 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
662 | if (IS_ERR(afi)) |
663 | return PTR_ERR(afi); | |
664 | ||
665 | name = nla[NFTA_TABLE_NAME]; | |
f2a6d766 | 666 | table = nf_tables_table_lookup(afi, name, genmask); |
96518518 PM |
667 | if (IS_ERR(table)) { |
668 | if (PTR_ERR(table) != -ENOENT) | |
669 | return PTR_ERR(table); | |
670 | table = NULL; | |
671 | } | |
672 | ||
673 | if (table != NULL) { | |
674 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
675 | return -EEXIST; | |
676 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
677 | return -EOPNOTSUPP; | |
e1aaca93 | 678 | |
633c9a84 | 679 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
e1aaca93 | 680 | return nf_tables_updtable(&ctx); |
96518518 PM |
681 | } |
682 | ||
c5c1f975 PM |
683 | if (nla[NFTA_TABLE_FLAGS]) { |
684 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
685 | if (flags & ~NFT_TABLE_F_DORMANT) | |
686 | return -EINVAL; | |
687 | } | |
688 | ||
ebddf1a8 | 689 | err = -EAFNOSUPPORT; |
7047f9d0 | 690 | if (!try_module_get(afi->owner)) |
ebddf1a8 | 691 | goto err1; |
7047f9d0 | 692 | |
ffdb210e | 693 | err = -ENOMEM; |
1cae565e | 694 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
ffdb210e | 695 | if (table == NULL) |
ebddf1a8 | 696 | goto err2; |
96518518 | 697 | |
1cae565e | 698 | nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN); |
96518518 | 699 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 700 | INIT_LIST_HEAD(&table->sets); |
c5c1f975 | 701 | table->flags = flags; |
9ddf6323 | 702 | |
633c9a84 | 703 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
55dd6f93 | 704 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
ffdb210e | 705 | if (err < 0) |
ebddf1a8 | 706 | goto err3; |
ffdb210e | 707 | |
e688a7f8 | 708 | list_add_tail_rcu(&table->list, &afi->tables); |
96518518 | 709 | return 0; |
ebddf1a8 | 710 | err3: |
ffdb210e | 711 | kfree(table); |
ebddf1a8 | 712 | err2: |
ffdb210e | 713 | module_put(afi->owner); |
ebddf1a8 | 714 | err1: |
ffdb210e | 715 | return err; |
96518518 PM |
716 | } |
717 | ||
b9ac12ef AB |
718 | static int nft_flush_table(struct nft_ctx *ctx) |
719 | { | |
720 | int err; | |
721 | struct nft_chain *chain, *nc; | |
722 | struct nft_set *set, *ns; | |
723 | ||
a2f18db0 | 724 | list_for_each_entry(chain, &ctx->table->chains, list) { |
b9ac12ef AB |
725 | ctx->chain = chain; |
726 | ||
727 | err = nft_delrule_by_chain(ctx); | |
728 | if (err < 0) | |
729 | goto out; | |
b9ac12ef AB |
730 | } |
731 | ||
732 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
733 | if (set->flags & NFT_SET_ANONYMOUS && | |
734 | !list_empty(&set->bindings)) | |
735 | continue; | |
736 | ||
737 | err = nft_delset(ctx, set); | |
738 | if (err < 0) | |
739 | goto out; | |
740 | } | |
741 | ||
a2f18db0 PNA |
742 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
743 | ctx->chain = chain; | |
744 | ||
745 | err = nft_delchain(ctx); | |
746 | if (err < 0) | |
747 | goto out; | |
748 | } | |
749 | ||
b9ac12ef AB |
750 | err = nft_deltable(ctx); |
751 | out: | |
752 | return err; | |
753 | } | |
754 | ||
755 | static int nft_flush(struct nft_ctx *ctx, int family) | |
756 | { | |
757 | struct nft_af_info *afi; | |
758 | struct nft_table *table, *nt; | |
759 | const struct nlattr * const *nla = ctx->nla; | |
760 | int err = 0; | |
761 | ||
762 | list_for_each_entry(afi, &ctx->net->nft.af_info, list) { | |
763 | if (family != AF_UNSPEC && afi->family != family) | |
764 | continue; | |
765 | ||
766 | ctx->afi = afi; | |
767 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
f2a6d766 PNA |
768 | if (!nft_is_active_next(ctx->net, table)) |
769 | continue; | |
770 | ||
b9ac12ef AB |
771 | if (nla[NFTA_TABLE_NAME] && |
772 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
773 | continue; | |
774 | ||
775 | ctx->table = table; | |
776 | ||
777 | err = nft_flush_table(ctx); | |
778 | if (err < 0) | |
779 | goto out; | |
780 | } | |
781 | } | |
782 | out: | |
783 | return err; | |
784 | } | |
785 | ||
633c9a84 PNA |
786 | static int nf_tables_deltable(struct net *net, struct sock *nlsk, |
787 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
788 | const struct nlattr * const nla[]) |
789 | { | |
790 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 791 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
792 | struct nft_af_info *afi; |
793 | struct nft_table *table; | |
ee01d542 | 794 | int family = nfmsg->nfgen_family; |
55dd6f93 | 795 | struct nft_ctx ctx; |
96518518 | 796 | |
633c9a84 | 797 | nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla); |
b9ac12ef AB |
798 | if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL) |
799 | return nft_flush(&ctx, family); | |
800 | ||
99633ab2 | 801 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
802 | if (IS_ERR(afi)) |
803 | return PTR_ERR(afi); | |
804 | ||
f2a6d766 | 805 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
806 | if (IS_ERR(table)) |
807 | return PTR_ERR(table); | |
96518518 | 808 | |
b9ac12ef AB |
809 | ctx.afi = afi; |
810 | ctx.table = table; | |
55dd6f93 | 811 | |
b9ac12ef | 812 | return nft_flush_table(&ctx); |
96518518 PM |
813 | } |
814 | ||
55dd6f93 PNA |
815 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
816 | { | |
4fefee57 PNA |
817 | BUG_ON(ctx->table->use > 0); |
818 | ||
55dd6f93 PNA |
819 | kfree(ctx->table); |
820 | module_put(ctx->afi->owner); | |
821 | } | |
822 | ||
2a37d755 | 823 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 824 | { |
9370761c | 825 | int err = 0; |
96518518 PM |
826 | |
827 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
9370761c PNA |
828 | if (chain_type[ctype->family][ctype->type] != NULL) { |
829 | err = -EBUSY; | |
830 | goto out; | |
96518518 | 831 | } |
9370761c PNA |
832 | chain_type[ctype->family][ctype->type] = ctype; |
833 | out: | |
96518518 PM |
834 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
835 | return err; | |
836 | } | |
9370761c | 837 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 838 | |
2a37d755 | 839 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 840 | { |
96518518 | 841 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 842 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
843 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
844 | } | |
9370761c | 845 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
846 | |
847 | /* | |
848 | * Chains | |
849 | */ | |
850 | ||
851 | static struct nft_chain * | |
852 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) | |
853 | { | |
854 | struct nft_chain *chain; | |
855 | ||
856 | list_for_each_entry(chain, &table->chains, list) { | |
857 | if (chain->handle == handle) | |
858 | return chain; | |
859 | } | |
860 | ||
861 | return ERR_PTR(-ENOENT); | |
862 | } | |
863 | ||
864 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
865 | const struct nlattr *nla) | |
866 | { | |
867 | struct nft_chain *chain; | |
868 | ||
869 | if (nla == NULL) | |
870 | return ERR_PTR(-EINVAL); | |
871 | ||
872 | list_for_each_entry(chain, &table->chains, list) { | |
873 | if (!nla_strcmp(nla, chain->name)) | |
874 | return chain; | |
875 | } | |
876 | ||
877 | return ERR_PTR(-ENOENT); | |
878 | } | |
879 | ||
880 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
881 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, | |
882 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, | |
883 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
884 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
885 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 886 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 887 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 888 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
889 | }; |
890 | ||
891 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
892 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
893 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
2cbce139 PNA |
894 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
895 | .len = IFNAMSIZ - 1 }, | |
96518518 PM |
896 | }; |
897 | ||
0ca743a5 PNA |
898 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
899 | { | |
900 | struct nft_stats *cpu_stats, total; | |
901 | struct nlattr *nest; | |
ce355e20 ED |
902 | unsigned int seq; |
903 | u64 pkts, bytes; | |
0ca743a5 PNA |
904 | int cpu; |
905 | ||
906 | memset(&total, 0, sizeof(total)); | |
907 | for_each_possible_cpu(cpu) { | |
908 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
909 | do { |
910 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
911 | pkts = cpu_stats->pkts; | |
912 | bytes = cpu_stats->bytes; | |
913 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
914 | total.pkts += pkts; | |
915 | total.bytes += bytes; | |
0ca743a5 PNA |
916 | } |
917 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
918 | if (nest == NULL) | |
919 | goto nla_put_failure; | |
920 | ||
b46f6ded ND |
921 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), |
922 | NFTA_COUNTER_PAD) || | |
923 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), | |
924 | NFTA_COUNTER_PAD)) | |
0ca743a5 PNA |
925 | goto nla_put_failure; |
926 | ||
927 | nla_nest_end(skb, nest); | |
928 | return 0; | |
929 | ||
930 | nla_put_failure: | |
931 | return -ENOSPC; | |
932 | } | |
933 | ||
84d7fce6 PNA |
934 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
935 | u32 portid, u32 seq, int event, u32 flags, | |
936 | int family, const struct nft_table *table, | |
96518518 PM |
937 | const struct nft_chain *chain) |
938 | { | |
939 | struct nlmsghdr *nlh; | |
940 | struct nfgenmsg *nfmsg; | |
941 | ||
942 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
943 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
944 | if (nlh == NULL) | |
945 | goto nla_put_failure; | |
946 | ||
947 | nfmsg = nlmsg_data(nlh); | |
948 | nfmsg->nfgen_family = family; | |
949 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 950 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
951 | |
952 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
953 | goto nla_put_failure; | |
b46f6ded ND |
954 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), |
955 | NFTA_CHAIN_PAD)) | |
96518518 PM |
956 | goto nla_put_failure; |
957 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
958 | goto nla_put_failure; | |
959 | ||
960 | if (chain->flags & NFT_BASE_CHAIN) { | |
0ca743a5 | 961 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 962 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
963 | struct nlattr *nest; |
964 | ||
965 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
966 | if (nest == NULL) |
967 | goto nla_put_failure; | |
968 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
969 | goto nla_put_failure; | |
970 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
971 | goto nla_put_failure; | |
2cbce139 PNA |
972 | if (basechain->dev_name[0] && |
973 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) | |
974 | goto nla_put_failure; | |
96518518 | 975 | nla_nest_end(skb, nest); |
9370761c | 976 | |
0ca743a5 PNA |
977 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
978 | htonl(basechain->policy))) | |
979 | goto nla_put_failure; | |
980 | ||
baae3e62 PM |
981 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
982 | goto nla_put_failure; | |
0ca743a5 PNA |
983 | |
984 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
985 | goto nla_put_failure; | |
96518518 PM |
986 | } |
987 | ||
0ca743a5 PNA |
988 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
989 | goto nla_put_failure; | |
990 | ||
053c095a JB |
991 | nlmsg_end(skb, nlh); |
992 | return 0; | |
96518518 PM |
993 | |
994 | nla_put_failure: | |
995 | nlmsg_trim(skb, nlh); | |
996 | return -1; | |
997 | } | |
998 | ||
35151d84 | 999 | static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
1000 | { |
1001 | struct sk_buff *skb; | |
96518518 PM |
1002 | int err; |
1003 | ||
128ad332 PNA |
1004 | if (!ctx->report && |
1005 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
1006 | return 0; |
1007 | ||
1008 | err = -ENOBUFS; | |
1009 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1010 | if (skb == NULL) | |
1011 | goto err; | |
1012 | ||
84d7fce6 PNA |
1013 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
1014 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1015 | ctx->chain); |
96518518 PM |
1016 | if (err < 0) { |
1017 | kfree_skb(skb); | |
1018 | goto err; | |
1019 | } | |
1020 | ||
128ad332 PNA |
1021 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1022 | ctx->report, GFP_KERNEL); | |
96518518 | 1023 | err: |
128ad332 PNA |
1024 | if (err < 0) { |
1025 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
1026 | err); | |
1027 | } | |
96518518 PM |
1028 | return err; |
1029 | } | |
1030 | ||
1031 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1032 | struct netlink_callback *cb) | |
1033 | { | |
1034 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1035 | const struct nft_af_info *afi; | |
1036 | const struct nft_table *table; | |
1037 | const struct nft_chain *chain; | |
1038 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1039 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1040 | int family = nfmsg->nfgen_family; |
1041 | ||
e688a7f8 | 1042 | rcu_read_lock(); |
38e029f1 PNA |
1043 | cb->seq = net->nft.base_seq; |
1044 | ||
e688a7f8 | 1045 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1046 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1047 | continue; | |
1048 | ||
e688a7f8 PNA |
1049 | list_for_each_entry_rcu(table, &afi->tables, list) { |
1050 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
96518518 PM |
1051 | if (idx < s_idx) |
1052 | goto cont; | |
1053 | if (idx > s_idx) | |
1054 | memset(&cb->args[1], 0, | |
1055 | sizeof(cb->args) - sizeof(cb->args[0])); | |
84d7fce6 PNA |
1056 | if (nf_tables_fill_chain_info(skb, net, |
1057 | NETLINK_CB(cb->skb).portid, | |
96518518 PM |
1058 | cb->nlh->nlmsg_seq, |
1059 | NFT_MSG_NEWCHAIN, | |
1060 | NLM_F_MULTI, | |
1061 | afi->family, table, chain) < 0) | |
1062 | goto done; | |
38e029f1 PNA |
1063 | |
1064 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
1065 | cont: |
1066 | idx++; | |
1067 | } | |
1068 | } | |
1069 | } | |
1070 | done: | |
e688a7f8 | 1071 | rcu_read_unlock(); |
96518518 PM |
1072 | cb->args[0] = idx; |
1073 | return skb->len; | |
1074 | } | |
1075 | ||
7b8002a1 PNA |
1076 | static int nf_tables_getchain(struct net *net, struct sock *nlsk, |
1077 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
1078 | const struct nlattr * const nla[]) |
1079 | { | |
1080 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1081 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
1082 | const struct nft_af_info *afi; |
1083 | const struct nft_table *table; | |
1084 | const struct nft_chain *chain; | |
1085 | struct sk_buff *skb2; | |
1086 | int family = nfmsg->nfgen_family; | |
1087 | int err; | |
1088 | ||
1089 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1090 | struct netlink_dump_control c = { | |
1091 | .dump = nf_tables_dump_chains, | |
1092 | }; | |
1093 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1094 | } | |
1095 | ||
99633ab2 | 1096 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1097 | if (IS_ERR(afi)) |
1098 | return PTR_ERR(afi); | |
1099 | ||
f2a6d766 | 1100 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1101 | if (IS_ERR(table)) |
1102 | return PTR_ERR(table); | |
1103 | ||
1104 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
1105 | if (IS_ERR(chain)) | |
1106 | return PTR_ERR(chain); | |
91c7b38d PNA |
1107 | if (chain->flags & NFT_CHAIN_INACTIVE) |
1108 | return -ENOENT; | |
96518518 PM |
1109 | |
1110 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1111 | if (!skb2) | |
1112 | return -ENOMEM; | |
1113 | ||
84d7fce6 | 1114 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1115 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1116 | family, table, chain); | |
1117 | if (err < 0) | |
1118 | goto err; | |
1119 | ||
1120 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1121 | ||
1122 | err: | |
1123 | kfree_skb(skb2); | |
1124 | return err; | |
1125 | } | |
1126 | ||
0ca743a5 PNA |
1127 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1128 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1129 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1130 | }; | |
1131 | ||
ff3cd7b3 | 1132 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1133 | { |
1134 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1135 | struct nft_stats __percpu *newstats; | |
1136 | struct nft_stats *stats; | |
1137 | int err; | |
1138 | ||
1139 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); | |
1140 | if (err < 0) | |
ff3cd7b3 | 1141 | return ERR_PTR(err); |
0ca743a5 PNA |
1142 | |
1143 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1144 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1145 | |
ce355e20 | 1146 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1147 | if (newstats == NULL) |
ff3cd7b3 | 1148 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1149 | |
1150 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1151 | * are not exposed to userspace. | |
1152 | */ | |
e8781f70 | 1153 | preempt_disable(); |
0ca743a5 PNA |
1154 | stats = this_cpu_ptr(newstats); |
1155 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1156 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1157 | preempt_enable(); |
0ca743a5 | 1158 | |
ff3cd7b3 PNA |
1159 | return newstats; |
1160 | } | |
1161 | ||
1162 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
1163 | struct nft_stats __percpu *newstats) | |
1164 | { | |
b88825de PNA |
1165 | if (newstats == NULL) |
1166 | return; | |
1167 | ||
0ca743a5 | 1168 | if (chain->stats) { |
0ca743a5 | 1169 | struct nft_stats __percpu *oldstats = |
67a8fc27 | 1170 | nft_dereference(chain->stats); |
0ca743a5 PNA |
1171 | |
1172 | rcu_assign_pointer(chain->stats, newstats); | |
1173 | synchronize_rcu(); | |
1174 | free_percpu(oldstats); | |
1175 | } else | |
1176 | rcu_assign_pointer(chain->stats, newstats); | |
0ca743a5 PNA |
1177 | } |
1178 | ||
91c7b38d PNA |
1179 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
1180 | { | |
1181 | BUG_ON(chain->use > 0); | |
1182 | ||
1183 | if (chain->flags & NFT_BASE_CHAIN) { | |
2cbce139 PNA |
1184 | struct nft_base_chain *basechain = nft_base_chain(chain); |
1185 | ||
1186 | module_put(basechain->type->owner); | |
1187 | free_percpu(basechain->stats); | |
1188 | if (basechain->ops[0].dev != NULL) | |
1189 | dev_put(basechain->ops[0].dev); | |
1190 | kfree(basechain); | |
91c7b38d PNA |
1191 | } else { |
1192 | kfree(chain); | |
1193 | } | |
1194 | } | |
1195 | ||
633c9a84 PNA |
1196 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
1197 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
1198 | const struct nlattr * const nla[]) |
1199 | { | |
1200 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1201 | const struct nlattr * uninitialized_var(name); | |
7c95f6d8 | 1202 | struct nft_af_info *afi; |
96518518 PM |
1203 | struct nft_table *table; |
1204 | struct nft_chain *chain; | |
0ca743a5 | 1205 | struct nft_base_chain *basechain = NULL; |
96518518 | 1206 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
f2a6d766 | 1207 | u8 genmask = nft_genmask_next(net); |
96518518 | 1208 | int family = nfmsg->nfgen_family; |
2cbce139 | 1209 | struct net_device *dev = NULL; |
57de2a0c | 1210 | u8 policy = NF_ACCEPT; |
96518518 | 1211 | u64 handle = 0; |
115a60b1 | 1212 | unsigned int i; |
ff3cd7b3 | 1213 | struct nft_stats __percpu *stats; |
96518518 PM |
1214 | int err; |
1215 | bool create; | |
91c7b38d | 1216 | struct nft_ctx ctx; |
96518518 PM |
1217 | |
1218 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1219 | ||
99633ab2 | 1220 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
1221 | if (IS_ERR(afi)) |
1222 | return PTR_ERR(afi); | |
1223 | ||
f2a6d766 | 1224 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1225 | if (IS_ERR(table)) |
1226 | return PTR_ERR(table); | |
1227 | ||
96518518 PM |
1228 | chain = NULL; |
1229 | name = nla[NFTA_CHAIN_NAME]; | |
1230 | ||
1231 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1232 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
1233 | chain = nf_tables_chain_lookup_byhandle(table, handle); | |
1234 | if (IS_ERR(chain)) | |
1235 | return PTR_ERR(chain); | |
1236 | } else { | |
1237 | chain = nf_tables_chain_lookup(table, name); | |
1238 | if (IS_ERR(chain)) { | |
1239 | if (PTR_ERR(chain) != -ENOENT) | |
1240 | return PTR_ERR(chain); | |
1241 | chain = NULL; | |
1242 | } | |
1243 | } | |
1244 | ||
57de2a0c PM |
1245 | if (nla[NFTA_CHAIN_POLICY]) { |
1246 | if ((chain != NULL && | |
d6b6cb1d PNA |
1247 | !(chain->flags & NFT_BASE_CHAIN))) |
1248 | return -EOPNOTSUPP; | |
1249 | ||
1250 | if (chain == NULL && | |
57de2a0c PM |
1251 | nla[NFTA_CHAIN_HOOK] == NULL) |
1252 | return -EOPNOTSUPP; | |
1253 | ||
8f46df18 | 1254 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1255 | switch (policy) { |
1256 | case NF_DROP: | |
1257 | case NF_ACCEPT: | |
1258 | break; | |
1259 | default: | |
1260 | return -EINVAL; | |
1261 | } | |
1262 | } | |
1263 | ||
96518518 | 1264 | if (chain != NULL) { |
91c7b38d PNA |
1265 | struct nft_stats *stats = NULL; |
1266 | struct nft_trans *trans; | |
1267 | ||
1268 | if (chain->flags & NFT_CHAIN_INACTIVE) | |
1269 | return -ENOENT; | |
96518518 PM |
1270 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
1271 | return -EEXIST; | |
1272 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1273 | return -EOPNOTSUPP; | |
1274 | ||
1275 | if (nla[NFTA_CHAIN_HANDLE] && name && | |
1276 | !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) | |
1277 | return -EEXIST; | |
1278 | ||
0ca743a5 PNA |
1279 | if (nla[NFTA_CHAIN_COUNTERS]) { |
1280 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
1281 | return -EOPNOTSUPP; | |
1282 | ||
ff3cd7b3 PNA |
1283 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1284 | if (IS_ERR(stats)) | |
1285 | return PTR_ERR(stats); | |
0ca743a5 PNA |
1286 | } |
1287 | ||
633c9a84 | 1288 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
91c7b38d PNA |
1289 | trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN, |
1290 | sizeof(struct nft_trans_chain)); | |
f5553c19 PNA |
1291 | if (trans == NULL) { |
1292 | free_percpu(stats); | |
91c7b38d | 1293 | return -ENOMEM; |
f5553c19 | 1294 | } |
4401a862 | 1295 | |
91c7b38d PNA |
1296 | nft_trans_chain_stats(trans) = stats; |
1297 | nft_trans_chain_update(trans) = true; | |
4401a862 | 1298 | |
91c7b38d PNA |
1299 | if (nla[NFTA_CHAIN_POLICY]) |
1300 | nft_trans_chain_policy(trans) = policy; | |
1301 | else | |
1302 | nft_trans_chain_policy(trans) = -1; | |
96518518 | 1303 | |
91c7b38d PNA |
1304 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
1305 | nla_strlcpy(nft_trans_chain_name(trans), name, | |
1306 | NFT_CHAIN_MAXNAMELEN); | |
1307 | } | |
1308 | list_add_tail(&trans->list, &net->nft.commit_list); | |
1309 | return 0; | |
96518518 PM |
1310 | } |
1311 | ||
75820676 PM |
1312 | if (table->use == UINT_MAX) |
1313 | return -EOVERFLOW; | |
1314 | ||
96518518 | 1315 | if (nla[NFTA_CHAIN_HOOK]) { |
2a37d755 | 1316 | const struct nf_chain_type *type; |
96518518 | 1317 | struct nf_hook_ops *ops; |
9370761c | 1318 | nf_hookfn *hookfn; |
115a60b1 | 1319 | u32 hooknum, priority; |
9370761c | 1320 | |
baae3e62 | 1321 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
9370761c PNA |
1322 | if (nla[NFTA_CHAIN_TYPE]) { |
1323 | type = nf_tables_chain_type_lookup(afi, | |
1324 | nla[NFTA_CHAIN_TYPE], | |
1325 | create); | |
93b0806f PM |
1326 | if (IS_ERR(type)) |
1327 | return PTR_ERR(type); | |
9370761c | 1328 | } |
96518518 PM |
1329 | |
1330 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
1331 | nft_hook_policy); | |
1332 | if (err < 0) | |
1333 | return err; | |
1334 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1335 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1336 | return -EINVAL; | |
9370761c PNA |
1337 | |
1338 | hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
1339 | if (hooknum >= afi->nhooks) | |
96518518 | 1340 | return -EINVAL; |
115a60b1 | 1341 | priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
96518518 | 1342 | |
baae3e62 | 1343 | if (!(type->hook_mask & (1 << hooknum))) |
9370761c | 1344 | return -EOPNOTSUPP; |
fa2c1de0 | 1345 | if (!try_module_get(type->owner)) |
baae3e62 | 1346 | return -ENOENT; |
fa2c1de0 | 1347 | hookfn = type->hooks[hooknum]; |
9370761c | 1348 | |
2cbce139 PNA |
1349 | if (afi->flags & NFT_AF_NEEDS_DEV) { |
1350 | char ifname[IFNAMSIZ]; | |
1351 | ||
1352 | if (!ha[NFTA_HOOK_DEV]) { | |
1353 | module_put(type->owner); | |
1354 | return -EOPNOTSUPP; | |
1355 | } | |
1356 | ||
1357 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); | |
1358 | dev = dev_get_by_name(net, ifname); | |
1359 | if (!dev) { | |
1360 | module_put(type->owner); | |
1361 | return -ENOENT; | |
1362 | } | |
1363 | } else if (ha[NFTA_HOOK_DEV]) { | |
1364 | module_put(type->owner); | |
1365 | return -EOPNOTSUPP; | |
1366 | } | |
1367 | ||
96518518 | 1368 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
f5553c19 PNA |
1369 | if (basechain == NULL) { |
1370 | module_put(type->owner); | |
2cbce139 PNA |
1371 | if (dev != NULL) |
1372 | dev_put(dev); | |
96518518 | 1373 | return -ENOMEM; |
f5553c19 | 1374 | } |
9370761c | 1375 | |
2cbce139 PNA |
1376 | if (dev != NULL) |
1377 | strncpy(basechain->dev_name, dev->name, IFNAMSIZ); | |
1378 | ||
4401a862 | 1379 | if (nla[NFTA_CHAIN_COUNTERS]) { |
ff3cd7b3 PNA |
1380 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1381 | if (IS_ERR(stats)) { | |
fa2c1de0 | 1382 | module_put(type->owner); |
4401a862 | 1383 | kfree(basechain); |
2cbce139 PNA |
1384 | if (dev != NULL) |
1385 | dev_put(dev); | |
ff3cd7b3 | 1386 | return PTR_ERR(stats); |
4401a862 | 1387 | } |
ff3cd7b3 | 1388 | basechain->stats = stats; |
4401a862 | 1389 | } else { |
ce355e20 | 1390 | stats = netdev_alloc_pcpu_stats(struct nft_stats); |
c123bb71 | 1391 | if (stats == NULL) { |
fa2c1de0 | 1392 | module_put(type->owner); |
4401a862 | 1393 | kfree(basechain); |
2cbce139 PNA |
1394 | if (dev != NULL) |
1395 | dev_put(dev); | |
c123bb71 | 1396 | return -ENOMEM; |
4401a862 | 1397 | } |
ff3cd7b3 | 1398 | rcu_assign_pointer(basechain->stats, stats); |
4401a862 PM |
1399 | } |
1400 | ||
5ebb335d | 1401 | write_pnet(&basechain->pnet, net); |
9370761c | 1402 | basechain->type = type; |
96518518 PM |
1403 | chain = &basechain->chain; |
1404 | ||
115a60b1 PM |
1405 | for (i = 0; i < afi->nops; i++) { |
1406 | ops = &basechain->ops[i]; | |
1407 | ops->pf = family; | |
115a60b1 PM |
1408 | ops->hooknum = hooknum; |
1409 | ops->priority = priority; | |
1410 | ops->priv = chain; | |
1411 | ops->hook = afi->hooks[ops->hooknum]; | |
2cbce139 | 1412 | ops->dev = dev; |
115a60b1 PM |
1413 | if (hookfn) |
1414 | ops->hook = hookfn; | |
1415 | if (afi->hook_ops_init) | |
1416 | afi->hook_ops_init(ops, i); | |
1417 | } | |
96518518 PM |
1418 | |
1419 | chain->flags |= NFT_BASE_CHAIN; | |
57de2a0c | 1420 | basechain->policy = policy; |
96518518 PM |
1421 | } else { |
1422 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1423 | if (chain == NULL) | |
1424 | return -ENOMEM; | |
1425 | } | |
1426 | ||
1427 | INIT_LIST_HEAD(&chain->rules); | |
1428 | chain->handle = nf_tables_alloc_handle(table); | |
b5bc89bf | 1429 | chain->table = table; |
96518518 PM |
1430 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
1431 | ||
d8ee8f7c PNA |
1432 | err = nf_tables_register_hooks(table, chain, afi->nops); |
1433 | if (err < 0) | |
1434 | goto err1; | |
96518518 | 1435 | |
633c9a84 | 1436 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
91c7b38d PNA |
1437 | err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN); |
1438 | if (err < 0) | |
1439 | goto err2; | |
96518518 | 1440 | |
4fefee57 | 1441 | table->use++; |
e688a7f8 | 1442 | list_add_tail_rcu(&chain->list, &table->chains); |
91c7b38d PNA |
1443 | return 0; |
1444 | err2: | |
c5598794 | 1445 | nf_tables_unregister_hooks(table, chain, afi->nops); |
91c7b38d PNA |
1446 | err1: |
1447 | nf_tables_chain_destroy(chain); | |
1448 | return err; | |
96518518 PM |
1449 | } |
1450 | ||
633c9a84 PNA |
1451 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
1452 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
1453 | const struct nlattr * const nla[]) |
1454 | { | |
1455 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1456 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 1457 | struct nft_af_info *afi; |
96518518 PM |
1458 | struct nft_table *table; |
1459 | struct nft_chain *chain; | |
1460 | int family = nfmsg->nfgen_family; | |
91c7b38d | 1461 | struct nft_ctx ctx; |
96518518 | 1462 | |
99633ab2 | 1463 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1464 | if (IS_ERR(afi)) |
1465 | return PTR_ERR(afi); | |
1466 | ||
f2a6d766 | 1467 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1468 | if (IS_ERR(table)) |
1469 | return PTR_ERR(table); | |
1470 | ||
1471 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
1472 | if (IS_ERR(chain)) | |
1473 | return PTR_ERR(chain); | |
4fefee57 | 1474 | if (chain->use > 0) |
96518518 PM |
1475 | return -EBUSY; |
1476 | ||
633c9a84 | 1477 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0165d932 | 1478 | |
ee01d542 | 1479 | return nft_delchain(&ctx); |
96518518 PM |
1480 | } |
1481 | ||
96518518 PM |
1482 | /* |
1483 | * Expressions | |
1484 | */ | |
1485 | ||
1486 | /** | |
ef1f7df9 PM |
1487 | * nft_register_expr - register nf_tables expr type |
1488 | * @ops: expr type | |
96518518 | 1489 | * |
ef1f7df9 | 1490 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1491 | * success or a negative errno code otherwise. |
1492 | */ | |
ef1f7df9 | 1493 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1494 | { |
1495 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1496 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1497 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1498 | else |
e688a7f8 | 1499 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1500 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1501 | return 0; | |
1502 | } | |
1503 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1504 | ||
1505 | /** | |
ef1f7df9 PM |
1506 | * nft_unregister_expr - unregister nf_tables expr type |
1507 | * @ops: expr type | |
96518518 | 1508 | * |
ef1f7df9 | 1509 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1510 | */ |
ef1f7df9 | 1511 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1512 | { |
1513 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1514 | list_del_rcu(&type->list); |
96518518 PM |
1515 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1516 | } | |
1517 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1518 | ||
64d46806 PM |
1519 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1520 | struct nlattr *nla) | |
96518518 | 1521 | { |
ef1f7df9 | 1522 | const struct nft_expr_type *type; |
96518518 | 1523 | |
ef1f7df9 | 1524 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1525 | if (!nla_strcmp(nla, type->name) && |
1526 | (!type->family || type->family == family)) | |
ef1f7df9 | 1527 | return type; |
96518518 PM |
1528 | } |
1529 | return NULL; | |
1530 | } | |
1531 | ||
64d46806 PM |
1532 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1533 | struct nlattr *nla) | |
96518518 | 1534 | { |
ef1f7df9 | 1535 | const struct nft_expr_type *type; |
96518518 PM |
1536 | |
1537 | if (nla == NULL) | |
1538 | return ERR_PTR(-EINVAL); | |
1539 | ||
64d46806 | 1540 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1541 | if (type != NULL && try_module_get(type->owner)) |
1542 | return type; | |
96518518 PM |
1543 | |
1544 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1545 | if (type == NULL) { |
64d46806 PM |
1546 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1547 | request_module("nft-expr-%u-%.*s", family, | |
1548 | nla_len(nla), (char *)nla_data(nla)); | |
1549 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1550 | if (__nft_expr_type_get(family, nla)) | |
1551 | return ERR_PTR(-EAGAIN); | |
1552 | ||
96518518 PM |
1553 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1554 | request_module("nft-expr-%.*s", | |
1555 | nla_len(nla), (char *)nla_data(nla)); | |
1556 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1557 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1558 | return ERR_PTR(-EAGAIN); |
1559 | } | |
1560 | #endif | |
1561 | return ERR_PTR(-ENOENT); | |
1562 | } | |
1563 | ||
1564 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1565 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1566 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1567 | }; | |
1568 | ||
1569 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1570 | const struct nft_expr *expr) | |
1571 | { | |
ef1f7df9 | 1572 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1573 | goto nla_put_failure; |
1574 | ||
1575 | if (expr->ops->dump) { | |
1576 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1577 | if (data == NULL) | |
1578 | goto nla_put_failure; | |
1579 | if (expr->ops->dump(skb, expr) < 0) | |
1580 | goto nla_put_failure; | |
1581 | nla_nest_end(skb, data); | |
1582 | } | |
1583 | ||
1584 | return skb->len; | |
1585 | ||
1586 | nla_put_failure: | |
1587 | return -1; | |
1588 | }; | |
1589 | ||
0b2d8a7b PM |
1590 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
1591 | const struct nft_expr *expr) | |
1592 | { | |
1593 | struct nlattr *nest; | |
1594 | ||
1595 | nest = nla_nest_start(skb, attr); | |
1596 | if (!nest) | |
1597 | goto nla_put_failure; | |
1598 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1599 | goto nla_put_failure; | |
1600 | nla_nest_end(skb, nest); | |
1601 | return 0; | |
1602 | ||
1603 | nla_put_failure: | |
1604 | return -1; | |
1605 | } | |
1606 | ||
96518518 PM |
1607 | struct nft_expr_info { |
1608 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1609 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1610 | }; |
1611 | ||
0ca743a5 PNA |
1612 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1613 | const struct nlattr *nla, | |
96518518 PM |
1614 | struct nft_expr_info *info) |
1615 | { | |
ef1f7df9 | 1616 | const struct nft_expr_type *type; |
96518518 | 1617 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1618 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1619 | int err; |
1620 | ||
ef1f7df9 | 1621 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
96518518 PM |
1622 | if (err < 0) |
1623 | return err; | |
1624 | ||
64d46806 | 1625 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1626 | if (IS_ERR(type)) |
1627 | return PTR_ERR(type); | |
1628 | ||
1629 | if (tb[NFTA_EXPR_DATA]) { | |
1630 | err = nla_parse_nested(info->tb, type->maxattr, | |
1631 | tb[NFTA_EXPR_DATA], type->policy); | |
1632 | if (err < 0) | |
1633 | goto err1; | |
1634 | } else | |
1635 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1636 | ||
1637 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1638 | ops = type->select_ops(ctx, |
1639 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1640 | if (IS_ERR(ops)) { |
1641 | err = PTR_ERR(ops); | |
1642 | goto err1; | |
1643 | } | |
1644 | } else | |
1645 | ops = type->ops; | |
1646 | ||
96518518 PM |
1647 | info->ops = ops; |
1648 | return 0; | |
ef1f7df9 PM |
1649 | |
1650 | err1: | |
1651 | module_put(type->owner); | |
1652 | return err; | |
96518518 PM |
1653 | } |
1654 | ||
1655 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1656 | const struct nft_expr_info *info, |
96518518 PM |
1657 | struct nft_expr *expr) |
1658 | { | |
1659 | const struct nft_expr_ops *ops = info->ops; | |
1660 | int err; | |
1661 | ||
1662 | expr->ops = ops; | |
1663 | if (ops->init) { | |
ef1f7df9 | 1664 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1665 | if (err < 0) |
1666 | goto err1; | |
1667 | } | |
1668 | ||
96518518 PM |
1669 | return 0; |
1670 | ||
1671 | err1: | |
1672 | expr->ops = NULL; | |
1673 | return err; | |
1674 | } | |
1675 | ||
62472bce PM |
1676 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1677 | struct nft_expr *expr) | |
96518518 PM |
1678 | { |
1679 | if (expr->ops->destroy) | |
62472bce | 1680 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1681 | module_put(expr->ops->type->owner); |
96518518 PM |
1682 | } |
1683 | ||
0b2d8a7b PM |
1684 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
1685 | const struct nlattr *nla) | |
1686 | { | |
1687 | struct nft_expr_info info; | |
1688 | struct nft_expr *expr; | |
1689 | int err; | |
1690 | ||
1691 | err = nf_tables_expr_parse(ctx, nla, &info); | |
1692 | if (err < 0) | |
1693 | goto err1; | |
1694 | ||
1695 | err = -ENOMEM; | |
1696 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
1697 | if (expr == NULL) | |
1698 | goto err2; | |
1699 | ||
1700 | err = nf_tables_newexpr(ctx, &info, expr); | |
1701 | if (err < 0) | |
1702 | goto err2; | |
1703 | ||
1704 | return expr; | |
1705 | err2: | |
1706 | module_put(info.ops->type->owner); | |
1707 | err1: | |
1708 | return ERR_PTR(err); | |
1709 | } | |
1710 | ||
1711 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
1712 | { | |
1713 | nf_tables_expr_destroy(ctx, expr); | |
1714 | kfree(expr); | |
1715 | } | |
1716 | ||
96518518 PM |
1717 | /* |
1718 | * Rules | |
1719 | */ | |
1720 | ||
1721 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1722 | u64 handle) | |
1723 | { | |
1724 | struct nft_rule *rule; | |
1725 | ||
1726 | // FIXME: this sucks | |
1727 | list_for_each_entry(rule, &chain->rules, list) { | |
1728 | if (handle == rule->handle) | |
1729 | return rule; | |
1730 | } | |
1731 | ||
1732 | return ERR_PTR(-ENOENT); | |
1733 | } | |
1734 | ||
1735 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1736 | const struct nlattr *nla) | |
1737 | { | |
1738 | if (nla == NULL) | |
1739 | return ERR_PTR(-EINVAL); | |
1740 | ||
1741 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1742 | } | |
1743 | ||
1744 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
1745 | [NFTA_RULE_TABLE] = { .type = NLA_STRING }, | |
1746 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, | |
1747 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1748 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1749 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1750 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1751 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1752 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1753 | .len = NFT_USERDATA_MAXLEN }, | |
96518518 PM |
1754 | }; |
1755 | ||
84d7fce6 PNA |
1756 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
1757 | u32 portid, u32 seq, int event, | |
1758 | u32 flags, int family, | |
96518518 PM |
1759 | const struct nft_table *table, |
1760 | const struct nft_chain *chain, | |
1761 | const struct nft_rule *rule) | |
1762 | { | |
1763 | struct nlmsghdr *nlh; | |
1764 | struct nfgenmsg *nfmsg; | |
1765 | const struct nft_expr *expr, *next; | |
1766 | struct nlattr *list; | |
5e948466 EL |
1767 | const struct nft_rule *prule; |
1768 | int type = event | NFNL_SUBSYS_NFTABLES << 8; | |
96518518 | 1769 | |
5e948466 | 1770 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
96518518 PM |
1771 | flags); |
1772 | if (nlh == NULL) | |
1773 | goto nla_put_failure; | |
1774 | ||
1775 | nfmsg = nlmsg_data(nlh); | |
1776 | nfmsg->nfgen_family = family; | |
1777 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1778 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1779 | |
1780 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1781 | goto nla_put_failure; | |
1782 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1783 | goto nla_put_failure; | |
b46f6ded ND |
1784 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), |
1785 | NFTA_RULE_PAD)) | |
96518518 PM |
1786 | goto nla_put_failure; |
1787 | ||
5e948466 EL |
1788 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
1789 | prule = list_entry(rule->list.prev, struct nft_rule, list); | |
1790 | if (nla_put_be64(skb, NFTA_RULE_POSITION, | |
b46f6ded ND |
1791 | cpu_to_be64(prule->handle), |
1792 | NFTA_RULE_PAD)) | |
5e948466 EL |
1793 | goto nla_put_failure; |
1794 | } | |
1795 | ||
96518518 PM |
1796 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
1797 | if (list == NULL) | |
1798 | goto nla_put_failure; | |
1799 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 1800 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 1801 | goto nla_put_failure; |
96518518 PM |
1802 | } |
1803 | nla_nest_end(skb, list); | |
1804 | ||
86f1ec32 PM |
1805 | if (rule->udata) { |
1806 | struct nft_userdata *udata = nft_userdata(rule); | |
1807 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
1808 | udata->data) < 0) | |
1809 | goto nla_put_failure; | |
1810 | } | |
0768b3b3 | 1811 | |
053c095a JB |
1812 | nlmsg_end(skb, nlh); |
1813 | return 0; | |
96518518 PM |
1814 | |
1815 | nla_put_failure: | |
1816 | nlmsg_trim(skb, nlh); | |
1817 | return -1; | |
1818 | } | |
1819 | ||
35151d84 | 1820 | static int nf_tables_rule_notify(const struct nft_ctx *ctx, |
96518518 | 1821 | const struct nft_rule *rule, |
35151d84 | 1822 | int event) |
96518518 PM |
1823 | { |
1824 | struct sk_buff *skb; | |
96518518 PM |
1825 | int err; |
1826 | ||
128ad332 PNA |
1827 | if (!ctx->report && |
1828 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
1829 | return 0; |
1830 | ||
1831 | err = -ENOBUFS; | |
1832 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1833 | if (skb == NULL) | |
1834 | goto err; | |
1835 | ||
84d7fce6 PNA |
1836 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
1837 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1838 | ctx->chain, rule); |
96518518 PM |
1839 | if (err < 0) { |
1840 | kfree_skb(skb); | |
1841 | goto err; | |
1842 | } | |
1843 | ||
128ad332 PNA |
1844 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1845 | ctx->report, GFP_KERNEL); | |
96518518 | 1846 | err: |
128ad332 PNA |
1847 | if (err < 0) { |
1848 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
1849 | err); | |
1850 | } | |
96518518 PM |
1851 | return err; |
1852 | } | |
1853 | ||
1854 | static int nf_tables_dump_rules(struct sk_buff *skb, | |
1855 | struct netlink_callback *cb) | |
1856 | { | |
1857 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1858 | const struct nft_af_info *afi; | |
1859 | const struct nft_table *table; | |
1860 | const struct nft_chain *chain; | |
1861 | const struct nft_rule *rule; | |
1862 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1863 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1864 | int family = nfmsg->nfgen_family; |
1865 | ||
e688a7f8 | 1866 | rcu_read_lock(); |
38e029f1 PNA |
1867 | cb->seq = net->nft.base_seq; |
1868 | ||
e688a7f8 | 1869 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1870 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1871 | continue; | |
1872 | ||
e688a7f8 PNA |
1873 | list_for_each_entry_rcu(table, &afi->tables, list) { |
1874 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
1875 | list_for_each_entry_rcu(rule, &chain->rules, list) { | |
889f7ee7 | 1876 | if (!nft_is_active(net, rule)) |
0628b123 | 1877 | goto cont; |
96518518 PM |
1878 | if (idx < s_idx) |
1879 | goto cont; | |
1880 | if (idx > s_idx) | |
1881 | memset(&cb->args[1], 0, | |
1882 | sizeof(cb->args) - sizeof(cb->args[0])); | |
84d7fce6 | 1883 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, |
96518518 PM |
1884 | cb->nlh->nlmsg_seq, |
1885 | NFT_MSG_NEWRULE, | |
1886 | NLM_F_MULTI | NLM_F_APPEND, | |
1887 | afi->family, table, chain, rule) < 0) | |
1888 | goto done; | |
38e029f1 PNA |
1889 | |
1890 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
1891 | cont: |
1892 | idx++; | |
1893 | } | |
1894 | } | |
1895 | } | |
1896 | } | |
1897 | done: | |
e688a7f8 PNA |
1898 | rcu_read_unlock(); |
1899 | ||
96518518 PM |
1900 | cb->args[0] = idx; |
1901 | return skb->len; | |
1902 | } | |
1903 | ||
7b8002a1 PNA |
1904 | static int nf_tables_getrule(struct net *net, struct sock *nlsk, |
1905 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
1906 | const struct nlattr * const nla[]) |
1907 | { | |
1908 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1909 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
1910 | const struct nft_af_info *afi; |
1911 | const struct nft_table *table; | |
1912 | const struct nft_chain *chain; | |
1913 | const struct nft_rule *rule; | |
1914 | struct sk_buff *skb2; | |
1915 | int family = nfmsg->nfgen_family; | |
1916 | int err; | |
1917 | ||
1918 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1919 | struct netlink_dump_control c = { | |
1920 | .dump = nf_tables_dump_rules, | |
1921 | }; | |
1922 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1923 | } | |
1924 | ||
99633ab2 | 1925 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1926 | if (IS_ERR(afi)) |
1927 | return PTR_ERR(afi); | |
1928 | ||
f2a6d766 | 1929 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
1930 | if (IS_ERR(table)) |
1931 | return PTR_ERR(table); | |
1932 | ||
1933 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1934 | if (IS_ERR(chain)) | |
1935 | return PTR_ERR(chain); | |
91c7b38d PNA |
1936 | if (chain->flags & NFT_CHAIN_INACTIVE) |
1937 | return -ENOENT; | |
96518518 PM |
1938 | |
1939 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
1940 | if (IS_ERR(rule)) | |
1941 | return PTR_ERR(rule); | |
1942 | ||
1943 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1944 | if (!skb2) | |
1945 | return -ENOMEM; | |
1946 | ||
84d7fce6 | 1947 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1948 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
1949 | family, table, chain, rule); | |
1950 | if (err < 0) | |
1951 | goto err; | |
1952 | ||
1953 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1954 | ||
1955 | err: | |
1956 | kfree_skb(skb2); | |
1957 | return err; | |
1958 | } | |
1959 | ||
62472bce PM |
1960 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
1961 | struct nft_rule *rule) | |
96518518 | 1962 | { |
96518518 PM |
1963 | struct nft_expr *expr; |
1964 | ||
1965 | /* | |
1966 | * Careful: some expressions might not be initialized in case this | |
1967 | * is called on error from nf_tables_newrule(). | |
1968 | */ | |
1969 | expr = nft_expr_first(rule); | |
1970 | while (expr->ops && expr != nft_expr_last(rule)) { | |
62472bce | 1971 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
1972 | expr = nft_expr_next(expr); |
1973 | } | |
1974 | kfree(rule); | |
1975 | } | |
1976 | ||
1081d11b PNA |
1977 | #define NFT_RULE_MAXEXPRS 128 |
1978 | ||
1979 | static struct nft_expr_info *info; | |
1980 | ||
633c9a84 PNA |
1981 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
1982 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
1983 | const struct nlattr * const nla[]) |
1984 | { | |
1985 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1986 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 1987 | struct nft_af_info *afi; |
96518518 PM |
1988 | struct nft_table *table; |
1989 | struct nft_chain *chain; | |
1990 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 1991 | struct nft_userdata *udata; |
1081d11b | 1992 | struct nft_trans *trans = NULL; |
96518518 PM |
1993 | struct nft_expr *expr; |
1994 | struct nft_ctx ctx; | |
1995 | struct nlattr *tmp; | |
86f1ec32 | 1996 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 PM |
1997 | int err, rem; |
1998 | bool create; | |
5e948466 | 1999 | u64 handle, pos_handle; |
96518518 PM |
2000 | |
2001 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
2002 | ||
99633ab2 | 2003 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
2004 | if (IS_ERR(afi)) |
2005 | return PTR_ERR(afi); | |
2006 | ||
f2a6d766 | 2007 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2008 | if (IS_ERR(table)) |
2009 | return PTR_ERR(table); | |
2010 | ||
2011 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
2012 | if (IS_ERR(chain)) | |
2013 | return PTR_ERR(chain); | |
2014 | ||
2015 | if (nla[NFTA_RULE_HANDLE]) { | |
2016 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
2017 | rule = __nf_tables_rule_lookup(chain, handle); | |
2018 | if (IS_ERR(rule)) | |
2019 | return PTR_ERR(rule); | |
2020 | ||
2021 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2022 | return -EEXIST; | |
2023 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2024 | old_rule = rule; | |
2025 | else | |
2026 | return -EOPNOTSUPP; | |
2027 | } else { | |
2028 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
2029 | return -EINVAL; | |
2030 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
2031 | |
2032 | if (chain->use == UINT_MAX) | |
2033 | return -EOVERFLOW; | |
96518518 PM |
2034 | } |
2035 | ||
5e948466 EL |
2036 | if (nla[NFTA_RULE_POSITION]) { |
2037 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2038 | return -EOPNOTSUPP; | |
2039 | ||
2040 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
2041 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
2042 | if (IS_ERR(old_rule)) | |
2043 | return PTR_ERR(old_rule); | |
2044 | } | |
2045 | ||
633c9a84 | 2046 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0ca743a5 | 2047 | |
96518518 PM |
2048 | n = 0; |
2049 | size = 0; | |
2050 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2051 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
2052 | err = -EINVAL; | |
2053 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2054 | goto err1; | |
2055 | if (n == NFT_RULE_MAXEXPRS) | |
2056 | goto err1; | |
0ca743a5 | 2057 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2058 | if (err < 0) |
2059 | goto err1; | |
2060 | size += info[n].ops->size; | |
2061 | n++; | |
2062 | } | |
2063 | } | |
9889840f PM |
2064 | /* Check for overflow of dlen field */ |
2065 | err = -EFBIG; | |
2066 | if (size >= 1 << 12) | |
2067 | goto err1; | |
96518518 | 2068 | |
86f1ec32 | 2069 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2070 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2071 | if (ulen > 0) |
2072 | usize = sizeof(struct nft_userdata) + ulen; | |
2073 | } | |
0768b3b3 | 2074 | |
96518518 | 2075 | err = -ENOMEM; |
86f1ec32 | 2076 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2077 | if (rule == NULL) |
2078 | goto err1; | |
2079 | ||
889f7ee7 | 2080 | nft_activate_next(net, rule); |
0628b123 | 2081 | |
96518518 PM |
2082 | rule->handle = handle; |
2083 | rule->dlen = size; | |
86f1ec32 | 2084 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2085 | |
86f1ec32 PM |
2086 | if (ulen) { |
2087 | udata = nft_userdata(rule); | |
2088 | udata->len = ulen - 1; | |
2089 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2090 | } | |
96518518 | 2091 | |
96518518 PM |
2092 | expr = nft_expr_first(rule); |
2093 | for (i = 0; i < n; i++) { | |
2094 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2095 | if (err < 0) | |
2096 | goto err2; | |
ef1f7df9 | 2097 | info[i].ops = NULL; |
96518518 PM |
2098 | expr = nft_expr_next(expr); |
2099 | } | |
2100 | ||
96518518 | 2101 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
889f7ee7 | 2102 | if (nft_is_active_next(net, old_rule)) { |
ac904ac8 | 2103 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
b380e5c7 | 2104 | old_rule); |
1081d11b | 2105 | if (trans == NULL) { |
0628b123 PNA |
2106 | err = -ENOMEM; |
2107 | goto err2; | |
2108 | } | |
889f7ee7 | 2109 | nft_deactivate_next(net, old_rule); |
ac34b861 | 2110 | chain->use--; |
5bc5c307 | 2111 | list_add_tail_rcu(&rule->list, &old_rule->list); |
0628b123 PNA |
2112 | } else { |
2113 | err = -ENOENT; | |
2114 | goto err2; | |
2115 | } | |
96518518 | 2116 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
2117 | if (old_rule) |
2118 | list_add_rcu(&rule->list, &old_rule->list); | |
2119 | else | |
2120 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2121 | else { | |
2122 | if (old_rule) | |
2123 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2124 | else | |
2125 | list_add_rcu(&rule->list, &chain->rules); | |
2126 | } | |
96518518 | 2127 | |
b380e5c7 | 2128 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
0628b123 PNA |
2129 | err = -ENOMEM; |
2130 | goto err3; | |
2131 | } | |
4fefee57 | 2132 | chain->use++; |
96518518 PM |
2133 | return 0; |
2134 | ||
0628b123 PNA |
2135 | err3: |
2136 | list_del_rcu(&rule->list); | |
96518518 | 2137 | err2: |
62472bce | 2138 | nf_tables_rule_destroy(&ctx, rule); |
96518518 PM |
2139 | err1: |
2140 | for (i = 0; i < n; i++) { | |
2141 | if (info[i].ops != NULL) | |
ef1f7df9 | 2142 | module_put(info[i].ops->type->owner); |
96518518 PM |
2143 | } |
2144 | return err; | |
2145 | } | |
2146 | ||
633c9a84 PNA |
2147 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
2148 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
2149 | const struct nlattr * const nla[]) |
2150 | { | |
2151 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2152 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2153 | struct nft_af_info *afi; |
7c95f6d8 | 2154 | struct nft_table *table; |
cf9dc09d PNA |
2155 | struct nft_chain *chain = NULL; |
2156 | struct nft_rule *rule; | |
0628b123 PNA |
2157 | int family = nfmsg->nfgen_family, err = 0; |
2158 | struct nft_ctx ctx; | |
96518518 | 2159 | |
99633ab2 | 2160 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2161 | if (IS_ERR(afi)) |
2162 | return PTR_ERR(afi); | |
2163 | ||
f2a6d766 | 2164 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2165 | if (IS_ERR(table)) |
2166 | return PTR_ERR(table); | |
2167 | ||
cf9dc09d PNA |
2168 | if (nla[NFTA_RULE_CHAIN]) { |
2169 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
2170 | if (IS_ERR(chain)) | |
2171 | return PTR_ERR(chain); | |
2172 | } | |
96518518 | 2173 | |
633c9a84 | 2174 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0628b123 | 2175 | |
cf9dc09d PNA |
2176 | if (chain) { |
2177 | if (nla[NFTA_RULE_HANDLE]) { | |
2178 | rule = nf_tables_rule_lookup(chain, | |
2179 | nla[NFTA_RULE_HANDLE]); | |
2180 | if (IS_ERR(rule)) | |
2181 | return PTR_ERR(rule); | |
96518518 | 2182 | |
5e266fe7 | 2183 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2184 | } else { |
ce24b721 | 2185 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2186 | } |
2187 | } else { | |
2188 | list_for_each_entry(chain, &table->chains, list) { | |
2189 | ctx.chain = chain; | |
ce24b721 | 2190 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2191 | if (err < 0) |
2192 | break; | |
2193 | } | |
2194 | } | |
2195 | ||
2196 | return err; | |
2197 | } | |
2198 | ||
20a69341 PM |
2199 | /* |
2200 | * Sets | |
2201 | */ | |
2202 | ||
2203 | static LIST_HEAD(nf_tables_set_ops); | |
2204 | ||
2205 | int nft_register_set(struct nft_set_ops *ops) | |
2206 | { | |
2207 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 2208 | list_add_tail_rcu(&ops->list, &nf_tables_set_ops); |
20a69341 PM |
2209 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2210 | return 0; | |
2211 | } | |
2212 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2213 | ||
2214 | void nft_unregister_set(struct nft_set_ops *ops) | |
2215 | { | |
2216 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 2217 | list_del_rcu(&ops->list); |
20a69341 PM |
2218 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2219 | } | |
2220 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2221 | ||
c50b960c PM |
2222 | /* |
2223 | * Select a set implementation based on the data characteristics and the | |
2224 | * given policy. The total memory use might not be known if no size is | |
2225 | * given, in that case the amount of memory per element is used. | |
2226 | */ | |
2227 | static const struct nft_set_ops * | |
2228 | nft_select_set_ops(const struct nlattr * const nla[], | |
2229 | const struct nft_set_desc *desc, | |
2230 | enum nft_set_policies policy) | |
20a69341 | 2231 | { |
c50b960c PM |
2232 | const struct nft_set_ops *ops, *bops; |
2233 | struct nft_set_estimate est, best; | |
20a69341 PM |
2234 | u32 features; |
2235 | ||
2236 | #ifdef CONFIG_MODULES | |
2237 | if (list_empty(&nf_tables_set_ops)) { | |
2238 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
2239 | request_module("nft-set"); | |
2240 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2241 | if (!list_empty(&nf_tables_set_ops)) | |
2242 | return ERR_PTR(-EAGAIN); | |
2243 | } | |
2244 | #endif | |
2245 | features = 0; | |
2246 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2247 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
4a8678ef | 2248 | features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT; |
20a69341 PM |
2249 | } |
2250 | ||
c50b960c PM |
2251 | bops = NULL; |
2252 | best.size = ~0; | |
2253 | best.class = ~0; | |
2254 | ||
20a69341 PM |
2255 | list_for_each_entry(ops, &nf_tables_set_ops, list) { |
2256 | if ((ops->features & features) != features) | |
2257 | continue; | |
c50b960c PM |
2258 | if (!ops->estimate(desc, features, &est)) |
2259 | continue; | |
2260 | ||
2261 | switch (policy) { | |
2262 | case NFT_SET_POL_PERFORMANCE: | |
2263 | if (est.class < best.class) | |
2264 | break; | |
2265 | if (est.class == best.class && est.size < best.size) | |
2266 | break; | |
2267 | continue; | |
2268 | case NFT_SET_POL_MEMORY: | |
2269 | if (est.size < best.size) | |
2270 | break; | |
2271 | if (est.size == best.size && est.class < best.class) | |
2272 | break; | |
2273 | continue; | |
2274 | default: | |
2275 | break; | |
2276 | } | |
2277 | ||
20a69341 PM |
2278 | if (!try_module_get(ops->owner)) |
2279 | continue; | |
c50b960c PM |
2280 | if (bops != NULL) |
2281 | module_put(bops->owner); | |
2282 | ||
2283 | bops = ops; | |
2284 | best = est; | |
20a69341 PM |
2285 | } |
2286 | ||
c50b960c PM |
2287 | if (bops != NULL) |
2288 | return bops; | |
2289 | ||
20a69341 PM |
2290 | return ERR_PTR(-EOPNOTSUPP); |
2291 | } | |
2292 | ||
2293 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
2294 | [NFTA_SET_TABLE] = { .type = NLA_STRING }, | |
a9bdd836 | 2295 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
cb39ad8b | 2296 | .len = NFT_SET_MAXNAMELEN - 1 }, |
20a69341 PM |
2297 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2298 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2299 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2300 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2301 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2302 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2303 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2304 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2305 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2306 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
e6d8ecac CFG |
2307 | [NFTA_SET_USERDATA] = { .type = NLA_BINARY, |
2308 | .len = NFT_USERDATA_MAXLEN }, | |
c50b960c PM |
2309 | }; |
2310 | ||
2311 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2312 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2313 | }; |
2314 | ||
633c9a84 | 2315 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
2316 | const struct sk_buff *skb, |
2317 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
2318 | const struct nlattr * const nla[], |
2319 | u8 genmask) | |
20a69341 PM |
2320 | { |
2321 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
2322 | struct nft_af_info *afi = NULL; |
2323 | struct nft_table *table = NULL; | |
20a69341 | 2324 | |
c9c8e485 PNA |
2325 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
2326 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
2327 | if (IS_ERR(afi)) | |
2328 | return PTR_ERR(afi); | |
2329 | } | |
20a69341 PM |
2330 | |
2331 | if (nla[NFTA_SET_TABLE] != NULL) { | |
ec2c9935 PM |
2332 | if (afi == NULL) |
2333 | return -EAFNOSUPPORT; | |
2334 | ||
f2a6d766 PNA |
2335 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], |
2336 | genmask); | |
20a69341 PM |
2337 | if (IS_ERR(table)) |
2338 | return PTR_ERR(table); | |
2339 | } | |
2340 | ||
633c9a84 | 2341 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2342 | return 0; |
2343 | } | |
2344 | ||
2345 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, | |
2346 | const struct nlattr *nla) | |
2347 | { | |
2348 | struct nft_set *set; | |
2349 | ||
2350 | if (nla == NULL) | |
2351 | return ERR_PTR(-EINVAL); | |
2352 | ||
2353 | list_for_each_entry(set, &table->sets, list) { | |
2354 | if (!nla_strcmp(nla, set->name)) | |
2355 | return set; | |
2356 | } | |
2357 | return ERR_PTR(-ENOENT); | |
2358 | } | |
2359 | ||
958bee14 PNA |
2360 | struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
2361 | const struct nlattr *nla) | |
2362 | { | |
2363 | struct nft_trans *trans; | |
2364 | u32 id = ntohl(nla_get_be32(nla)); | |
2365 | ||
2366 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
2367 | if (trans->msg_type == NFT_MSG_NEWSET && | |
2368 | id == nft_trans_set_id(trans)) | |
2369 | return nft_trans_set(trans); | |
2370 | } | |
2371 | return ERR_PTR(-ENOENT); | |
2372 | } | |
2373 | ||
20a69341 PM |
2374 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
2375 | const char *name) | |
2376 | { | |
2377 | const struct nft_set *i; | |
2378 | const char *p; | |
2379 | unsigned long *inuse; | |
60eb1894 | 2380 | unsigned int n = 0, min = 0; |
20a69341 | 2381 | |
cb39ad8b | 2382 | p = strnchr(name, NFT_SET_MAXNAMELEN, '%'); |
20a69341 PM |
2383 | if (p != NULL) { |
2384 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2385 | return -EINVAL; | |
2386 | ||
2387 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2388 | if (inuse == NULL) | |
2389 | return -ENOMEM; | |
60eb1894 | 2390 | cont: |
20a69341 | 2391 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2392 | int tmp; |
2393 | ||
2394 | if (!sscanf(i->name, name, &tmp)) | |
20a69341 | 2395 | continue; |
60eb1894 | 2396 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2397 | continue; |
14662917 | 2398 | |
60eb1894 | 2399 | set_bit(tmp - min, inuse); |
20a69341 PM |
2400 | } |
2401 | ||
53b70287 | 2402 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2403 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2404 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2405 | memset(inuse, 0, PAGE_SIZE); | |
2406 | goto cont; | |
2407 | } | |
20a69341 PM |
2408 | free_page((unsigned long)inuse); |
2409 | } | |
2410 | ||
60eb1894 | 2411 | snprintf(set->name, sizeof(set->name), name, min + n); |
20a69341 PM |
2412 | list_for_each_entry(i, &ctx->table->sets, list) { |
2413 | if (!strcmp(set->name, i->name)) | |
2414 | return -ENFILE; | |
2415 | } | |
2416 | return 0; | |
2417 | } | |
2418 | ||
2419 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2420 | const struct nft_set *set, u16 event, u16 flags) | |
2421 | { | |
2422 | struct nfgenmsg *nfmsg; | |
2423 | struct nlmsghdr *nlh; | |
c50b960c | 2424 | struct nlattr *desc; |
128ad332 PNA |
2425 | u32 portid = ctx->portid; |
2426 | u32 seq = ctx->seq; | |
20a69341 PM |
2427 | |
2428 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2429 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2430 | flags); | |
2431 | if (nlh == NULL) | |
2432 | goto nla_put_failure; | |
2433 | ||
2434 | nfmsg = nlmsg_data(nlh); | |
2435 | nfmsg->nfgen_family = ctx->afi->family; | |
2436 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2437 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
2438 | |
2439 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2440 | goto nla_put_failure; | |
2441 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2442 | goto nla_put_failure; | |
2443 | if (set->flags != 0) | |
2444 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2445 | goto nla_put_failure; | |
2446 | ||
2447 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2448 | goto nla_put_failure; | |
2449 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2450 | goto nla_put_failure; | |
2451 | if (set->flags & NFT_SET_MAP) { | |
2452 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2453 | goto nla_put_failure; | |
2454 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2455 | goto nla_put_failure; | |
2456 | } | |
2457 | ||
761da293 | 2458 | if (set->timeout && |
b46f6ded ND |
2459 | nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout), |
2460 | NFTA_SET_PAD)) | |
761da293 PM |
2461 | goto nla_put_failure; |
2462 | if (set->gc_int && | |
2463 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
2464 | goto nla_put_failure; | |
2465 | ||
9363dc4b AB |
2466 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
2467 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
2468 | goto nla_put_failure; | |
2469 | } | |
2470 | ||
e6d8ecac CFG |
2471 | if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) |
2472 | goto nla_put_failure; | |
2473 | ||
c50b960c PM |
2474 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
2475 | if (desc == NULL) | |
2476 | goto nla_put_failure; | |
2477 | if (set->size && | |
2478 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
2479 | goto nla_put_failure; | |
2480 | nla_nest_end(skb, desc); | |
2481 | ||
053c095a JB |
2482 | nlmsg_end(skb, nlh); |
2483 | return 0; | |
20a69341 PM |
2484 | |
2485 | nla_put_failure: | |
2486 | nlmsg_trim(skb, nlh); | |
2487 | return -1; | |
2488 | } | |
2489 | ||
2490 | static int nf_tables_set_notify(const struct nft_ctx *ctx, | |
2491 | const struct nft_set *set, | |
31f8441c | 2492 | int event, gfp_t gfp_flags) |
20a69341 PM |
2493 | { |
2494 | struct sk_buff *skb; | |
128ad332 | 2495 | u32 portid = ctx->portid; |
20a69341 PM |
2496 | int err; |
2497 | ||
128ad332 PNA |
2498 | if (!ctx->report && |
2499 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
20a69341 PM |
2500 | return 0; |
2501 | ||
2502 | err = -ENOBUFS; | |
31f8441c | 2503 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
2504 | if (skb == NULL) |
2505 | goto err; | |
2506 | ||
2507 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2508 | if (err < 0) { | |
2509 | kfree_skb(skb); | |
2510 | goto err; | |
2511 | } | |
2512 | ||
128ad332 | 2513 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, |
31f8441c | 2514 | ctx->report, gfp_flags); |
20a69341 PM |
2515 | err: |
2516 | if (err < 0) | |
99633ab2 | 2517 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
20a69341 PM |
2518 | return err; |
2519 | } | |
2520 | ||
5b96af77 | 2521 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
2522 | { |
2523 | const struct nft_set *set; | |
2524 | unsigned int idx, s_idx = cb->args[0]; | |
7c95f6d8 | 2525 | struct nft_af_info *afi; |
c9c8e485 PNA |
2526 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2527 | struct net *net = sock_net(skb->sk); | |
2528 | int cur_family = cb->args[3]; | |
5b96af77 | 2529 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
2530 | |
2531 | if (cb->args[1]) | |
2532 | return skb->len; | |
2533 | ||
e688a7f8 | 2534 | rcu_read_lock(); |
38e029f1 PNA |
2535 | cb->seq = net->nft.base_seq; |
2536 | ||
e688a7f8 | 2537 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
5b96af77 PNA |
2538 | if (ctx->afi && ctx->afi != afi) |
2539 | continue; | |
2540 | ||
c9c8e485 PNA |
2541 | if (cur_family) { |
2542 | if (afi->family != cur_family) | |
2543 | continue; | |
2544 | ||
2545 | cur_family = 0; | |
2546 | } | |
e688a7f8 | 2547 | list_for_each_entry_rcu(table, &afi->tables, list) { |
5b96af77 PNA |
2548 | if (ctx->table && ctx->table != table) |
2549 | continue; | |
2550 | ||
c9c8e485 PNA |
2551 | if (cur_table) { |
2552 | if (cur_table != table) | |
2553 | continue; | |
2554 | ||
2555 | cur_table = NULL; | |
2556 | } | |
c9c8e485 | 2557 | idx = 0; |
5b96af77 | 2558 | list_for_each_entry_rcu(set, &table->sets, list) { |
c9c8e485 PNA |
2559 | if (idx < s_idx) |
2560 | goto cont; | |
5b96af77 PNA |
2561 | |
2562 | ctx_set = *ctx; | |
2563 | ctx_set.table = table; | |
2564 | ctx_set.afi = afi; | |
2565 | if (nf_tables_fill_set(skb, &ctx_set, set, | |
c9c8e485 PNA |
2566 | NFT_MSG_NEWSET, |
2567 | NLM_F_MULTI) < 0) { | |
2568 | cb->args[0] = idx; | |
2569 | cb->args[2] = (unsigned long) table; | |
2570 | cb->args[3] = afi->family; | |
2571 | goto done; | |
2572 | } | |
38e029f1 | 2573 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 PNA |
2574 | cont: |
2575 | idx++; | |
2576 | } | |
2577 | if (s_idx) | |
2578 | s_idx = 0; | |
2579 | } | |
2580 | } | |
2581 | cb->args[1] = 1; | |
2582 | done: | |
e688a7f8 | 2583 | rcu_read_unlock(); |
c9c8e485 PNA |
2584 | return skb->len; |
2585 | } | |
2586 | ||
5b96af77 | 2587 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 2588 | { |
5b96af77 PNA |
2589 | kfree(cb->data); |
2590 | return 0; | |
20a69341 PM |
2591 | } |
2592 | ||
7b8002a1 PNA |
2593 | static int nf_tables_getset(struct net *net, struct sock *nlsk, |
2594 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
2595 | const struct nlattr * const nla[]) |
2596 | { | |
f2a6d766 | 2597 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
2598 | const struct nft_set *set; |
2599 | struct nft_ctx ctx; | |
2600 | struct sk_buff *skb2; | |
c9c8e485 | 2601 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2602 | int err; |
2603 | ||
01cfa0a4 | 2604 | /* Verify existence before starting dump */ |
f2a6d766 | 2605 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
2606 | if (err < 0) |
2607 | return err; | |
2608 | ||
2609 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2610 | struct netlink_dump_control c = { | |
2611 | .dump = nf_tables_dump_sets, | |
5b96af77 | 2612 | .done = nf_tables_dump_sets_done, |
20a69341 | 2613 | }; |
5b96af77 PNA |
2614 | struct nft_ctx *ctx_dump; |
2615 | ||
2616 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); | |
2617 | if (ctx_dump == NULL) | |
2618 | return -ENOMEM; | |
2619 | ||
2620 | *ctx_dump = ctx; | |
2621 | c.data = ctx_dump; | |
2622 | ||
20a69341 PM |
2623 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2624 | } | |
2625 | ||
c9c8e485 PNA |
2626 | /* Only accept unspec with dump */ |
2627 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2628 | return -EAFNOSUPPORT; | |
2629 | ||
20a69341 PM |
2630 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
2631 | if (IS_ERR(set)) | |
2632 | return PTR_ERR(set); | |
958bee14 PNA |
2633 | if (set->flags & NFT_SET_INACTIVE) |
2634 | return -ENOENT; | |
20a69341 PM |
2635 | |
2636 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2637 | if (skb2 == NULL) | |
2638 | return -ENOMEM; | |
2639 | ||
2640 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2641 | if (err < 0) | |
2642 | goto err; | |
2643 | ||
2644 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2645 | ||
2646 | err: | |
2647 | kfree_skb(skb2); | |
2648 | return err; | |
2649 | } | |
2650 | ||
c50b960c PM |
2651 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
2652 | struct nft_set_desc *desc, | |
2653 | const struct nlattr *nla) | |
2654 | { | |
2655 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
2656 | int err; | |
2657 | ||
2658 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy); | |
2659 | if (err < 0) | |
2660 | return err; | |
2661 | ||
2662 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
2663 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
2664 | ||
2665 | return 0; | |
2666 | } | |
2667 | ||
633c9a84 PNA |
2668 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
2669 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
2670 | const struct nlattr * const nla[]) |
2671 | { | |
2672 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2673 | u8 genmask = nft_genmask_next(net); |
20a69341 | 2674 | const struct nft_set_ops *ops; |
7c95f6d8 | 2675 | struct nft_af_info *afi; |
20a69341 PM |
2676 | struct nft_table *table; |
2677 | struct nft_set *set; | |
2678 | struct nft_ctx ctx; | |
cb39ad8b | 2679 | char name[NFT_SET_MAXNAMELEN]; |
20a69341 PM |
2680 | unsigned int size; |
2681 | bool create; | |
761da293 PM |
2682 | u64 timeout; |
2683 | u32 ktype, dtype, flags, policy, gc_int; | |
c50b960c | 2684 | struct nft_set_desc desc; |
e6d8ecac CFG |
2685 | unsigned char *udata; |
2686 | u16 udlen; | |
20a69341 PM |
2687 | int err; |
2688 | ||
2689 | if (nla[NFTA_SET_TABLE] == NULL || | |
2690 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
2691 | nla[NFTA_SET_KEY_LEN] == NULL || |
2692 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
2693 | return -EINVAL; |
2694 | ||
c50b960c PM |
2695 | memset(&desc, 0, sizeof(desc)); |
2696 | ||
20a69341 PM |
2697 | ktype = NFT_DATA_VALUE; |
2698 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
2699 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
2700 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
2701 | return -EINVAL; | |
2702 | } | |
2703 | ||
c50b960c | 2704 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 2705 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
2706 | return -EINVAL; |
2707 | ||
2708 | flags = 0; | |
2709 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2710 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
2711 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 PM |
2712 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
2713 | NFT_SET_MAP | NFT_SET_EVAL)) | |
20a69341 | 2714 | return -EINVAL; |
7c6c6e95 PM |
2715 | /* Only one of both operations is supported */ |
2716 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) == | |
2717 | (NFT_SET_MAP | NFT_SET_EVAL)) | |
2718 | return -EOPNOTSUPP; | |
20a69341 PM |
2719 | } |
2720 | ||
2721 | dtype = 0; | |
20a69341 PM |
2722 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
2723 | if (!(flags & NFT_SET_MAP)) | |
2724 | return -EINVAL; | |
2725 | ||
2726 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
2727 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
2728 | dtype != NFT_DATA_VERDICT) | |
2729 | return -EINVAL; | |
2730 | ||
2731 | if (dtype != NFT_DATA_VERDICT) { | |
2732 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
2733 | return -EINVAL; | |
c50b960c | 2734 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 2735 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
2736 | return -EINVAL; |
2737 | } else | |
7d740264 | 2738 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
2739 | } else if (flags & NFT_SET_MAP) |
2740 | return -EINVAL; | |
2741 | ||
761da293 PM |
2742 | timeout = 0; |
2743 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
2744 | if (!(flags & NFT_SET_TIMEOUT)) | |
2745 | return -EINVAL; | |
2746 | timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT])); | |
2747 | } | |
2748 | gc_int = 0; | |
2749 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
2750 | if (!(flags & NFT_SET_TIMEOUT)) | |
2751 | return -EINVAL; | |
2752 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
2753 | } | |
2754 | ||
c50b960c PM |
2755 | policy = NFT_SET_POL_PERFORMANCE; |
2756 | if (nla[NFTA_SET_POLICY] != NULL) | |
2757 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
2758 | ||
2759 | if (nla[NFTA_SET_DESC] != NULL) { | |
2760 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
2761 | if (err < 0) | |
2762 | return err; | |
2763 | } | |
2764 | ||
20a69341 PM |
2765 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
2766 | ||
99633ab2 | 2767 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
2768 | if (IS_ERR(afi)) |
2769 | return PTR_ERR(afi); | |
2770 | ||
f2a6d766 | 2771 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask); |
20a69341 PM |
2772 | if (IS_ERR(table)) |
2773 | return PTR_ERR(table); | |
2774 | ||
633c9a84 | 2775 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2776 | |
2777 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); | |
2778 | if (IS_ERR(set)) { | |
2779 | if (PTR_ERR(set) != -ENOENT) | |
2780 | return PTR_ERR(set); | |
2781 | set = NULL; | |
2782 | } | |
2783 | ||
2784 | if (set != NULL) { | |
2785 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2786 | return -EEXIST; | |
2787 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2788 | return -EOPNOTSUPP; | |
2789 | return 0; | |
2790 | } | |
2791 | ||
2792 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2793 | return -ENOENT; | |
2794 | ||
c50b960c | 2795 | ops = nft_select_set_ops(nla, &desc, policy); |
20a69341 PM |
2796 | if (IS_ERR(ops)) |
2797 | return PTR_ERR(ops); | |
2798 | ||
e6d8ecac CFG |
2799 | udlen = 0; |
2800 | if (nla[NFTA_SET_USERDATA]) | |
2801 | udlen = nla_len(nla[NFTA_SET_USERDATA]); | |
2802 | ||
20a69341 PM |
2803 | size = 0; |
2804 | if (ops->privsize != NULL) | |
2805 | size = ops->privsize(nla); | |
2806 | ||
2807 | err = -ENOMEM; | |
e6d8ecac | 2808 | set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); |
20a69341 PM |
2809 | if (set == NULL) |
2810 | goto err1; | |
2811 | ||
2812 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); | |
2813 | err = nf_tables_set_alloc_name(&ctx, set, name); | |
2814 | if (err < 0) | |
2815 | goto err2; | |
2816 | ||
e6d8ecac CFG |
2817 | udata = NULL; |
2818 | if (udlen) { | |
2819 | udata = set->data + size; | |
2820 | nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); | |
2821 | } | |
2822 | ||
20a69341 | 2823 | INIT_LIST_HEAD(&set->bindings); |
cc02e457 | 2824 | write_pnet(&set->pnet, net); |
20a69341 PM |
2825 | set->ops = ops; |
2826 | set->ktype = ktype; | |
c50b960c | 2827 | set->klen = desc.klen; |
20a69341 | 2828 | set->dtype = dtype; |
c50b960c | 2829 | set->dlen = desc.dlen; |
20a69341 | 2830 | set->flags = flags; |
c50b960c | 2831 | set->size = desc.size; |
9363dc4b | 2832 | set->policy = policy; |
e6d8ecac CFG |
2833 | set->udlen = udlen; |
2834 | set->udata = udata; | |
761da293 PM |
2835 | set->timeout = timeout; |
2836 | set->gc_int = gc_int; | |
20a69341 | 2837 | |
c50b960c | 2838 | err = ops->init(set, &desc, nla); |
20a69341 PM |
2839 | if (err < 0) |
2840 | goto err2; | |
2841 | ||
958bee14 | 2842 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 PM |
2843 | if (err < 0) |
2844 | goto err2; | |
2845 | ||
e688a7f8 | 2846 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 2847 | table->use++; |
20a69341 PM |
2848 | return 0; |
2849 | ||
2850 | err2: | |
2851 | kfree(set); | |
2852 | err1: | |
2853 | module_put(ops->owner); | |
2854 | return err; | |
2855 | } | |
2856 | ||
958bee14 | 2857 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 2858 | { |
20a69341 PM |
2859 | set->ops->destroy(set); |
2860 | module_put(set->ops->owner); | |
2861 | kfree(set); | |
2862 | } | |
2863 | ||
958bee14 PNA |
2864 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
2865 | { | |
e688a7f8 | 2866 | list_del_rcu(&set->list); |
31f8441c | 2867 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
2868 | nft_set_destroy(set); |
2869 | } | |
2870 | ||
633c9a84 PNA |
2871 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
2872 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
2873 | const struct nlattr * const nla[]) |
2874 | { | |
c9c8e485 | 2875 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
f2a6d766 | 2876 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
2877 | struct nft_set *set; |
2878 | struct nft_ctx ctx; | |
2879 | int err; | |
2880 | ||
ec2c9935 PM |
2881 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
2882 | return -EAFNOSUPPORT; | |
20a69341 PM |
2883 | if (nla[NFTA_SET_TABLE] == NULL) |
2884 | return -EINVAL; | |
2885 | ||
f2a6d766 | 2886 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
2887 | if (err < 0) |
2888 | return err; | |
2889 | ||
2890 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); | |
2891 | if (IS_ERR(set)) | |
2892 | return PTR_ERR(set); | |
2893 | if (!list_empty(&set->bindings)) | |
2894 | return -EBUSY; | |
2895 | ||
ee01d542 | 2896 | return nft_delset(&ctx, set); |
20a69341 PM |
2897 | } |
2898 | ||
2899 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
2900 | const struct nft_set *set, | |
2901 | const struct nft_set_iter *iter, | |
2902 | const struct nft_set_elem *elem) | |
2903 | { | |
fe2811eb | 2904 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
2905 | enum nft_registers dreg; |
2906 | ||
2907 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
2908 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
2909 | set->dtype == NFT_DATA_VERDICT ? | |
2910 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
2911 | set->dlen); | |
20a69341 PM |
2912 | } |
2913 | ||
2914 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2915 | struct nft_set_binding *binding) | |
2916 | { | |
2917 | struct nft_set_binding *i; | |
2918 | struct nft_set_iter iter; | |
2919 | ||
2920 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
2921 | return -EBUSY; | |
2922 | ||
11113e19 | 2923 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
2924 | /* If the set is already bound to the same chain all |
2925 | * jumps are already validated for that chain. | |
2926 | */ | |
2927 | list_for_each_entry(i, &set->bindings, list) { | |
11113e19 PM |
2928 | if (binding->flags & NFT_SET_MAP && |
2929 | i->chain == binding->chain) | |
20a69341 PM |
2930 | goto bind; |
2931 | } | |
2932 | ||
2933 | iter.skip = 0; | |
2934 | iter.count = 0; | |
2935 | iter.err = 0; | |
2936 | iter.fn = nf_tables_bind_check_setelem; | |
2937 | ||
2938 | set->ops->walk(ctx, set, &iter); | |
2939 | if (iter.err < 0) { | |
2940 | /* Destroy anonymous sets if binding fails */ | |
2941 | if (set->flags & NFT_SET_ANONYMOUS) | |
2942 | nf_tables_set_destroy(ctx, set); | |
2943 | ||
2944 | return iter.err; | |
2945 | } | |
2946 | } | |
2947 | bind: | |
2948 | binding->chain = ctx->chain; | |
e688a7f8 | 2949 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
2950 | return 0; |
2951 | } | |
2952 | ||
2953 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2954 | struct nft_set_binding *binding) | |
2955 | { | |
e688a7f8 | 2956 | list_del_rcu(&binding->list); |
20a69341 | 2957 | |
958bee14 PNA |
2958 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
2959 | !(set->flags & NFT_SET_INACTIVE)) | |
20a69341 PM |
2960 | nf_tables_set_destroy(ctx, set); |
2961 | } | |
2962 | ||
3ac4c07a PM |
2963 | const struct nft_set_ext_type nft_set_ext_types[] = { |
2964 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 2965 | .align = __alignof__(u32), |
3ac4c07a PM |
2966 | }, |
2967 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 2968 | .align = __alignof__(u32), |
3ac4c07a | 2969 | }, |
f25ad2e9 PM |
2970 | [NFT_SET_EXT_EXPR] = { |
2971 | .align = __alignof__(struct nft_expr), | |
2972 | }, | |
3ac4c07a PM |
2973 | [NFT_SET_EXT_FLAGS] = { |
2974 | .len = sizeof(u8), | |
2975 | .align = __alignof__(u8), | |
2976 | }, | |
c3e1b005 PM |
2977 | [NFT_SET_EXT_TIMEOUT] = { |
2978 | .len = sizeof(u64), | |
2979 | .align = __alignof__(u64), | |
2980 | }, | |
2981 | [NFT_SET_EXT_EXPIRATION] = { | |
2982 | .len = sizeof(unsigned long), | |
2983 | .align = __alignof__(unsigned long), | |
2984 | }, | |
68e942e8 PM |
2985 | [NFT_SET_EXT_USERDATA] = { |
2986 | .len = sizeof(struct nft_userdata), | |
2987 | .align = __alignof__(struct nft_userdata), | |
2988 | }, | |
3ac4c07a PM |
2989 | }; |
2990 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
2991 | ||
20a69341 PM |
2992 | /* |
2993 | * Set elements | |
2994 | */ | |
2995 | ||
2996 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
2997 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
2998 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
2999 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 3000 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
3001 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
3002 | .len = NFT_USERDATA_MAXLEN }, | |
20a69341 PM |
3003 | }; |
3004 | ||
3005 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
3006 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING }, | |
3007 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING }, | |
3008 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, | |
958bee14 | 3009 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
3010 | }; |
3011 | ||
633c9a84 | 3012 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
3013 | const struct sk_buff *skb, |
3014 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
3015 | const struct nlattr * const nla[], |
3016 | u8 genmask) | |
20a69341 PM |
3017 | { |
3018 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
3019 | struct nft_af_info *afi; |
3020 | struct nft_table *table; | |
20a69341 | 3021 | |
99633ab2 | 3022 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
3023 | if (IS_ERR(afi)) |
3024 | return PTR_ERR(afi); | |
3025 | ||
f2a6d766 PNA |
3026 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE], |
3027 | genmask); | |
20a69341 PM |
3028 | if (IS_ERR(table)) |
3029 | return PTR_ERR(table); | |
3030 | ||
633c9a84 | 3031 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
3032 | return 0; |
3033 | } | |
3034 | ||
3035 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
3036 | const struct nft_set *set, | |
3037 | const struct nft_set_elem *elem) | |
3038 | { | |
fe2811eb | 3039 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3040 | unsigned char *b = skb_tail_pointer(skb); |
3041 | struct nlattr *nest; | |
3042 | ||
3043 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
3044 | if (nest == NULL) | |
3045 | goto nla_put_failure; | |
3046 | ||
fe2811eb PM |
3047 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
3048 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
3049 | goto nla_put_failure; |
3050 | ||
fe2811eb PM |
3051 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3052 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
3053 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
3054 | set->dlen) < 0) | |
3055 | goto nla_put_failure; | |
3056 | ||
f25ad2e9 PM |
3057 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3058 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3059 | goto nla_put_failure; | |
3060 | ||
fe2811eb PM |
3061 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3062 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3063 | htonl(*nft_set_ext_flags(ext)))) | |
3064 | goto nla_put_failure; | |
20a69341 | 3065 | |
c3e1b005 PM |
3066 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3067 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
b46f6ded ND |
3068 | cpu_to_be64(*nft_set_ext_timeout(ext)), |
3069 | NFTA_SET_ELEM_PAD)) | |
c3e1b005 PM |
3070 | goto nla_put_failure; |
3071 | ||
3072 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
3073 | unsigned long expires, now = jiffies; | |
3074 | ||
3075 | expires = *nft_set_ext_expiration(ext); | |
3076 | if (time_before(now, expires)) | |
3077 | expires -= now; | |
3078 | else | |
3079 | expires = 0; | |
3080 | ||
3081 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
b46f6ded ND |
3082 | cpu_to_be64(jiffies_to_msecs(expires)), |
3083 | NFTA_SET_ELEM_PAD)) | |
c3e1b005 PM |
3084 | goto nla_put_failure; |
3085 | } | |
3086 | ||
68e942e8 PM |
3087 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3088 | struct nft_userdata *udata; | |
3089 | ||
3090 | udata = nft_set_ext_userdata(ext); | |
3091 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3092 | udata->len + 1, udata->data)) | |
3093 | goto nla_put_failure; | |
3094 | } | |
3095 | ||
20a69341 PM |
3096 | nla_nest_end(skb, nest); |
3097 | return 0; | |
3098 | ||
3099 | nla_put_failure: | |
3100 | nlmsg_trim(skb, b); | |
3101 | return -EMSGSIZE; | |
3102 | } | |
3103 | ||
3104 | struct nft_set_dump_args { | |
3105 | const struct netlink_callback *cb; | |
3106 | struct nft_set_iter iter; | |
3107 | struct sk_buff *skb; | |
3108 | }; | |
3109 | ||
3110 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
3111 | const struct nft_set *set, | |
3112 | const struct nft_set_iter *iter, | |
3113 | const struct nft_set_elem *elem) | |
3114 | { | |
3115 | struct nft_set_dump_args *args; | |
3116 | ||
3117 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3118 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3119 | } | |
3120 | ||
3121 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) | |
3122 | { | |
633c9a84 | 3123 | struct net *net = sock_net(skb->sk); |
f2a6d766 | 3124 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
3125 | const struct nft_set *set; |
3126 | struct nft_set_dump_args args; | |
3127 | struct nft_ctx ctx; | |
3128 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; | |
3129 | struct nfgenmsg *nfmsg; | |
3130 | struct nlmsghdr *nlh; | |
3131 | struct nlattr *nest; | |
3132 | u32 portid, seq; | |
3133 | int event, err; | |
3134 | ||
720e0dfa MN |
3135 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
3136 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); | |
20a69341 PM |
3137 | if (err < 0) |
3138 | return err; | |
3139 | ||
633c9a84 | 3140 | err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh, |
f2a6d766 | 3141 | (void *)nla, genmask); |
20a69341 PM |
3142 | if (err < 0) |
3143 | return err; | |
3144 | ||
3145 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
3146 | if (IS_ERR(set)) | |
3147 | return PTR_ERR(set); | |
958bee14 PNA |
3148 | if (set->flags & NFT_SET_INACTIVE) |
3149 | return -ENOENT; | |
20a69341 PM |
3150 | |
3151 | event = NFT_MSG_NEWSETELEM; | |
3152 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
3153 | portid = NETLINK_CB(cb->skb).portid; | |
3154 | seq = cb->nlh->nlmsg_seq; | |
3155 | ||
3156 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3157 | NLM_F_MULTI); | |
3158 | if (nlh == NULL) | |
3159 | goto nla_put_failure; | |
3160 | ||
3161 | nfmsg = nlmsg_data(nlh); | |
6403d962 | 3162 | nfmsg->nfgen_family = ctx.afi->family; |
20a69341 | 3163 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 3164 | nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff); |
20a69341 PM |
3165 | |
3166 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) | |
3167 | goto nla_put_failure; | |
3168 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3169 | goto nla_put_failure; | |
3170 | ||
3171 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3172 | if (nest == NULL) | |
3173 | goto nla_put_failure; | |
3174 | ||
3175 | args.cb = cb; | |
3176 | args.skb = skb; | |
3177 | args.iter.skip = cb->args[0]; | |
3178 | args.iter.count = 0; | |
3179 | args.iter.err = 0; | |
3180 | args.iter.fn = nf_tables_dump_setelem; | |
3181 | set->ops->walk(&ctx, set, &args.iter); | |
3182 | ||
3183 | nla_nest_end(skb, nest); | |
3184 | nlmsg_end(skb, nlh); | |
3185 | ||
3186 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3187 | return args.iter.err; | |
3188 | if (args.iter.count == cb->args[0]) | |
3189 | return 0; | |
3190 | ||
3191 | cb->args[0] = args.iter.count; | |
3192 | return skb->len; | |
3193 | ||
3194 | nla_put_failure: | |
3195 | return -ENOSPC; | |
3196 | } | |
3197 | ||
7b8002a1 PNA |
3198 | static int nf_tables_getsetelem(struct net *net, struct sock *nlsk, |
3199 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
3200 | const struct nlattr * const nla[]) |
3201 | { | |
f2a6d766 | 3202 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
3203 | const struct nft_set *set; |
3204 | struct nft_ctx ctx; | |
3205 | int err; | |
3206 | ||
f2a6d766 | 3207 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3208 | if (err < 0) |
3209 | return err; | |
3210 | ||
3211 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
3212 | if (IS_ERR(set)) | |
3213 | return PTR_ERR(set); | |
958bee14 PNA |
3214 | if (set->flags & NFT_SET_INACTIVE) |
3215 | return -ENOENT; | |
20a69341 PM |
3216 | |
3217 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3218 | struct netlink_dump_control c = { | |
3219 | .dump = nf_tables_dump_set, | |
3220 | }; | |
3221 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
3222 | } | |
3223 | return -EOPNOTSUPP; | |
3224 | } | |
3225 | ||
d60ce62f AB |
3226 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
3227 | const struct nft_ctx *ctx, u32 seq, | |
3228 | u32 portid, int event, u16 flags, | |
3229 | const struct nft_set *set, | |
3230 | const struct nft_set_elem *elem) | |
3231 | { | |
3232 | struct nfgenmsg *nfmsg; | |
3233 | struct nlmsghdr *nlh; | |
3234 | struct nlattr *nest; | |
3235 | int err; | |
3236 | ||
3237 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
3238 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3239 | flags); | |
3240 | if (nlh == NULL) | |
3241 | goto nla_put_failure; | |
3242 | ||
3243 | nfmsg = nlmsg_data(nlh); | |
3244 | nfmsg->nfgen_family = ctx->afi->family; | |
3245 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 3246 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
3247 | |
3248 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3249 | goto nla_put_failure; | |
3250 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3251 | goto nla_put_failure; | |
3252 | ||
3253 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3254 | if (nest == NULL) | |
3255 | goto nla_put_failure; | |
3256 | ||
3257 | err = nf_tables_fill_setelem(skb, set, elem); | |
3258 | if (err < 0) | |
3259 | goto nla_put_failure; | |
3260 | ||
3261 | nla_nest_end(skb, nest); | |
3262 | ||
053c095a JB |
3263 | nlmsg_end(skb, nlh); |
3264 | return 0; | |
d60ce62f AB |
3265 | |
3266 | nla_put_failure: | |
3267 | nlmsg_trim(skb, nlh); | |
3268 | return -1; | |
3269 | } | |
3270 | ||
3271 | static int nf_tables_setelem_notify(const struct nft_ctx *ctx, | |
3272 | const struct nft_set *set, | |
3273 | const struct nft_set_elem *elem, | |
3274 | int event, u16 flags) | |
3275 | { | |
128ad332 PNA |
3276 | struct net *net = ctx->net; |
3277 | u32 portid = ctx->portid; | |
d60ce62f AB |
3278 | struct sk_buff *skb; |
3279 | int err; | |
3280 | ||
128ad332 | 3281 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
d60ce62f AB |
3282 | return 0; |
3283 | ||
3284 | err = -ENOBUFS; | |
3285 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
3286 | if (skb == NULL) | |
3287 | goto err; | |
3288 | ||
3289 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
3290 | set, elem); | |
3291 | if (err < 0) { | |
3292 | kfree_skb(skb); | |
3293 | goto err; | |
3294 | } | |
3295 | ||
128ad332 | 3296 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
d60ce62f AB |
3297 | GFP_KERNEL); |
3298 | err: | |
3299 | if (err < 0) | |
3300 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
3301 | return err; | |
3302 | } | |
3303 | ||
60319eb1 PNA |
3304 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
3305 | int msg_type, | |
3306 | struct nft_set *set) | |
3307 | { | |
3308 | struct nft_trans *trans; | |
3309 | ||
3310 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
3311 | if (trans == NULL) | |
3312 | return NULL; | |
3313 | ||
3314 | nft_trans_elem_set(trans) = set; | |
3315 | return trans; | |
3316 | } | |
3317 | ||
22fe54d5 PM |
3318 | void *nft_set_elem_init(const struct nft_set *set, |
3319 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 3320 | const u32 *key, const u32 *data, |
22fe54d5 | 3321 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
3322 | { |
3323 | struct nft_set_ext *ext; | |
3324 | void *elem; | |
3325 | ||
3326 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
3327 | if (elem == NULL) | |
3328 | return NULL; | |
3329 | ||
3330 | ext = nft_set_elem_ext(set, elem); | |
3331 | nft_set_ext_init(ext, tmpl); | |
3332 | ||
3333 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
3334 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3335 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
3336 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
3337 | *nft_set_ext_expiration(ext) = | |
3338 | jiffies + msecs_to_jiffies(timeout); | |
3339 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) | |
3340 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
3341 | |
3342 | return elem; | |
3343 | } | |
3344 | ||
61edafbb PM |
3345 | void nft_set_elem_destroy(const struct nft_set *set, void *elem) |
3346 | { | |
3347 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3348 | ||
3349 | nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE); | |
3350 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3351 | nft_data_uninit(nft_set_ext_data(ext), set->dtype); | |
f25ad2e9 PM |
3352 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) |
3353 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); | |
61edafbb PM |
3354 | |
3355 | kfree(elem); | |
3356 | } | |
3357 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
3358 | ||
0e9091d6 PNA |
3359 | static int nft_setelem_parse_flags(const struct nft_set *set, |
3360 | const struct nlattr *attr, u32 *flags) | |
3361 | { | |
3362 | if (attr == NULL) | |
3363 | return 0; | |
3364 | ||
3365 | *flags = ntohl(nla_get_be32(attr)); | |
3366 | if (*flags & ~NFT_SET_ELEM_INTERVAL_END) | |
3367 | return -EINVAL; | |
3368 | if (!(set->flags & NFT_SET_INTERVAL) && | |
3369 | *flags & NFT_SET_ELEM_INTERVAL_END) | |
3370 | return -EINVAL; | |
3371 | ||
3372 | return 0; | |
3373 | } | |
3374 | ||
60319eb1 | 3375 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
3376 | const struct nlattr *attr) |
3377 | { | |
3378 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3379 | struct nft_data_desc d1, d2; | |
fe2811eb PM |
3380 | struct nft_set_ext_tmpl tmpl; |
3381 | struct nft_set_ext *ext; | |
20a69341 PM |
3382 | struct nft_set_elem elem; |
3383 | struct nft_set_binding *binding; | |
68e942e8 | 3384 | struct nft_userdata *udata; |
fe2811eb | 3385 | struct nft_data data; |
20a69341 | 3386 | enum nft_registers dreg; |
60319eb1 | 3387 | struct nft_trans *trans; |
0e9091d6 | 3388 | u32 flags = 0; |
c3e1b005 | 3389 | u64 timeout; |
68e942e8 | 3390 | u8 ulen; |
20a69341 PM |
3391 | int err; |
3392 | ||
3393 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3394 | nft_set_elem_policy); | |
3395 | if (err < 0) | |
3396 | return err; | |
3397 | ||
3398 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3399 | return -EINVAL; | |
3400 | ||
fe2811eb PM |
3401 | nft_set_ext_prepare(&tmpl); |
3402 | ||
0e9091d6 PNA |
3403 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); |
3404 | if (err < 0) | |
3405 | return err; | |
3406 | if (flags != 0) | |
3407 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
3408 | |
3409 | if (set->flags & NFT_SET_MAP) { | |
3410 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 3411 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 3412 | return -EINVAL; |
bd7fc645 | 3413 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 3414 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 3415 | return -EINVAL; |
20a69341 PM |
3416 | } else { |
3417 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
3418 | return -EINVAL; | |
3419 | } | |
3420 | ||
c3e1b005 PM |
3421 | timeout = 0; |
3422 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
3423 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
3424 | return -EINVAL; | |
3425 | timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT])); | |
3426 | } else if (set->flags & NFT_SET_TIMEOUT) { | |
3427 | timeout = set->timeout; | |
3428 | } | |
3429 | ||
7d740264 | 3430 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 3431 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3432 | if (err < 0) |
3433 | goto err1; | |
3434 | err = -EINVAL; | |
3435 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
3436 | goto err2; | |
3437 | ||
7d740264 | 3438 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
3439 | if (timeout > 0) { |
3440 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
3441 | if (timeout != set->timeout) | |
3442 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
3443 | } | |
fe2811eb | 3444 | |
20a69341 | 3445 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
3446 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
3447 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
3448 | if (err < 0) |
3449 | goto err2; | |
3450 | ||
3451 | err = -EINVAL; | |
3452 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
3453 | goto err3; | |
3454 | ||
3455 | dreg = nft_type_to_reg(set->dtype); | |
3456 | list_for_each_entry(binding, &set->bindings, list) { | |
3457 | struct nft_ctx bind_ctx = { | |
3458 | .afi = ctx->afi, | |
3459 | .table = ctx->table, | |
7c95f6d8 | 3460 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
3461 | }; |
3462 | ||
11113e19 PM |
3463 | if (!(binding->flags & NFT_SET_MAP)) |
3464 | continue; | |
3465 | ||
1ec10212 PM |
3466 | err = nft_validate_register_store(&bind_ctx, dreg, |
3467 | &data, | |
3468 | d2.type, d2.len); | |
20a69341 PM |
3469 | if (err < 0) |
3470 | goto err3; | |
3471 | } | |
fe2811eb | 3472 | |
7d740264 | 3473 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
3474 | } |
3475 | ||
68e942e8 PM |
3476 | /* The full maximum length of userdata can exceed the maximum |
3477 | * offset value (U8_MAX) for following extensions, therefor it | |
3478 | * must be the last extension added. | |
3479 | */ | |
3480 | ulen = 0; | |
3481 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
3482 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
3483 | if (ulen > 0) | |
3484 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
3485 | ulen); | |
3486 | } | |
3487 | ||
fe2811eb | 3488 | err = -ENOMEM; |
7d740264 | 3489 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 3490 | timeout, GFP_KERNEL); |
fe2811eb PM |
3491 | if (elem.priv == NULL) |
3492 | goto err3; | |
3493 | ||
3494 | ext = nft_set_elem_ext(set, elem.priv); | |
3495 | if (flags) | |
3496 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
3497 | if (ulen > 0) { |
3498 | udata = nft_set_ext_userdata(ext); | |
3499 | udata->len = ulen - 1; | |
3500 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
3501 | } | |
fe2811eb | 3502 | |
60319eb1 PNA |
3503 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
3504 | if (trans == NULL) | |
fe2811eb | 3505 | goto err4; |
60319eb1 | 3506 | |
69086658 | 3507 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
20a69341 PM |
3508 | err = set->ops->insert(set, &elem); |
3509 | if (err < 0) | |
fe2811eb | 3510 | goto err5; |
20a69341 | 3511 | |
60319eb1 | 3512 | nft_trans_elem(trans) = elem; |
46bbafce | 3513 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
3514 | return 0; |
3515 | ||
fe2811eb | 3516 | err5: |
60319eb1 | 3517 | kfree(trans); |
fe2811eb PM |
3518 | err4: |
3519 | kfree(elem.priv); | |
20a69341 PM |
3520 | err3: |
3521 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
fe2811eb | 3522 | nft_data_uninit(&data, d2.type); |
20a69341 | 3523 | err2: |
7d740264 | 3524 | nft_data_uninit(&elem.key.val, d1.type); |
20a69341 PM |
3525 | err1: |
3526 | return err; | |
3527 | } | |
3528 | ||
633c9a84 PNA |
3529 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
3530 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
3531 | const struct nlattr * const nla[]) |
3532 | { | |
f2a6d766 | 3533 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3534 | const struct nlattr *attr; |
3535 | struct nft_set *set; | |
3536 | struct nft_ctx ctx; | |
60319eb1 | 3537 | int rem, err = 0; |
20a69341 | 3538 | |
7d5570ca PNA |
3539 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
3540 | return -EINVAL; | |
3541 | ||
f2a6d766 | 3542 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3543 | if (err < 0) |
3544 | return err; | |
3545 | ||
3546 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
958bee14 PNA |
3547 | if (IS_ERR(set)) { |
3548 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { | |
3549 | set = nf_tables_set_lookup_byid(net, | |
3550 | nla[NFTA_SET_ELEM_LIST_SET_ID]); | |
3551 | } | |
3552 | if (IS_ERR(set)) | |
3553 | return PTR_ERR(set); | |
3554 | } | |
3555 | ||
20a69341 PM |
3556 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
3557 | return -EBUSY; | |
3558 | ||
3559 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3dd0673a PM |
3560 | if (set->size && |
3561 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) | |
3562 | return -ENFILE; | |
3563 | ||
20a69341 | 3564 | err = nft_add_set_elem(&ctx, set, attr); |
3dd0673a PM |
3565 | if (err < 0) { |
3566 | atomic_dec(&set->nelems); | |
60319eb1 | 3567 | break; |
3dd0673a | 3568 | } |
20a69341 | 3569 | } |
60319eb1 | 3570 | return err; |
20a69341 PM |
3571 | } |
3572 | ||
60319eb1 | 3573 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
3574 | const struct nlattr *attr) |
3575 | { | |
3576 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3971ca14 | 3577 | struct nft_set_ext_tmpl tmpl; |
20a69341 PM |
3578 | struct nft_data_desc desc; |
3579 | struct nft_set_elem elem; | |
3971ca14 | 3580 | struct nft_set_ext *ext; |
60319eb1 | 3581 | struct nft_trans *trans; |
3971ca14 PNA |
3582 | u32 flags = 0; |
3583 | void *priv; | |
20a69341 PM |
3584 | int err; |
3585 | ||
3586 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3587 | nft_set_elem_policy); | |
3588 | if (err < 0) | |
3589 | goto err1; | |
3590 | ||
3591 | err = -EINVAL; | |
3592 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3593 | goto err1; | |
3594 | ||
3971ca14 PNA |
3595 | nft_set_ext_prepare(&tmpl); |
3596 | ||
3597 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
3598 | if (err < 0) | |
3599 | return err; | |
3600 | if (flags != 0) | |
3601 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
3602 | ||
7d740264 | 3603 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 3604 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3605 | if (err < 0) |
3606 | goto err1; | |
3607 | ||
3608 | err = -EINVAL; | |
3609 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
3610 | goto err2; | |
3611 | ||
3971ca14 PNA |
3612 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len); |
3613 | ||
3614 | err = -ENOMEM; | |
3615 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0, | |
3616 | GFP_KERNEL); | |
3617 | if (elem.priv == NULL) | |
3618 | goto err2; | |
3619 | ||
3620 | ext = nft_set_elem_ext(set, elem.priv); | |
3621 | if (flags) | |
3622 | *nft_set_ext_flags(ext) = flags; | |
3623 | ||
60319eb1 | 3624 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
3625 | if (trans == NULL) { |
3626 | err = -ENOMEM; | |
3971ca14 | 3627 | goto err3; |
609ccf08 | 3628 | } |
20a69341 | 3629 | |
3971ca14 PNA |
3630 | priv = set->ops->deactivate(set, &elem); |
3631 | if (priv == NULL) { | |
cc02e457 | 3632 | err = -ENOENT; |
3971ca14 | 3633 | goto err4; |
cc02e457 | 3634 | } |
3971ca14 PNA |
3635 | kfree(elem.priv); |
3636 | elem.priv = priv; | |
cc02e457 | 3637 | |
60319eb1 | 3638 | nft_trans_elem(trans) = elem; |
46bbafce | 3639 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 3640 | return 0; |
cc02e457 | 3641 | |
3971ca14 | 3642 | err4: |
cc02e457 | 3643 | kfree(trans); |
3971ca14 PNA |
3644 | err3: |
3645 | kfree(elem.priv); | |
20a69341 | 3646 | err2: |
7d740264 | 3647 | nft_data_uninit(&elem.key.val, desc.type); |
20a69341 PM |
3648 | err1: |
3649 | return err; | |
3650 | } | |
3651 | ||
633c9a84 PNA |
3652 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
3653 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
3654 | const struct nlattr * const nla[]) |
3655 | { | |
f2a6d766 | 3656 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3657 | const struct nlattr *attr; |
3658 | struct nft_set *set; | |
3659 | struct nft_ctx ctx; | |
60319eb1 | 3660 | int rem, err = 0; |
20a69341 | 3661 | |
7d5570ca PNA |
3662 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
3663 | return -EINVAL; | |
3664 | ||
f2a6d766 | 3665 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3666 | if (err < 0) |
3667 | return err; | |
3668 | ||
3669 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
3670 | if (IS_ERR(set)) | |
3671 | return PTR_ERR(set); | |
3672 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
3673 | return -EBUSY; | |
3674 | ||
3675 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3676 | err = nft_del_setelem(&ctx, set, attr); | |
3677 | if (err < 0) | |
60319eb1 | 3678 | break; |
4fefee57 | 3679 | |
3dd0673a | 3680 | set->ndeact++; |
20a69341 | 3681 | } |
60319eb1 | 3682 | return err; |
20a69341 PM |
3683 | } |
3684 | ||
cfed7e1b PM |
3685 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
3686 | { | |
3687 | struct nft_set_gc_batch *gcb; | |
3688 | unsigned int i; | |
3689 | ||
3690 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
3691 | for (i = 0; i < gcb->head.cnt; i++) | |
3692 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i]); | |
3693 | kfree(gcb); | |
3694 | } | |
3695 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
3696 | ||
3697 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
3698 | gfp_t gfp) | |
3699 | { | |
3700 | struct nft_set_gc_batch *gcb; | |
3701 | ||
3702 | gcb = kzalloc(sizeof(*gcb), gfp); | |
3703 | if (gcb == NULL) | |
3704 | return gcb; | |
3705 | gcb->head.set = set; | |
3706 | return gcb; | |
3707 | } | |
3708 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
3709 | ||
84d7fce6 PNA |
3710 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
3711 | u32 portid, u32 seq) | |
3712 | { | |
3713 | struct nlmsghdr *nlh; | |
3714 | struct nfgenmsg *nfmsg; | |
3715 | int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN; | |
3716 | ||
3717 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
3718 | if (nlh == NULL) | |
3719 | goto nla_put_failure; | |
3720 | ||
3721 | nfmsg = nlmsg_data(nlh); | |
3722 | nfmsg->nfgen_family = AF_UNSPEC; | |
3723 | nfmsg->version = NFNETLINK_V0; | |
3724 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
3725 | ||
3726 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq))) | |
3727 | goto nla_put_failure; | |
3728 | ||
053c095a JB |
3729 | nlmsg_end(skb, nlh); |
3730 | return 0; | |
84d7fce6 PNA |
3731 | |
3732 | nla_put_failure: | |
3733 | nlmsg_trim(skb, nlh); | |
3734 | return -EMSGSIZE; | |
3735 | } | |
3736 | ||
3737 | static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event) | |
3738 | { | |
3739 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
3740 | struct sk_buff *skb2; | |
3741 | int err; | |
3742 | ||
3743 | if (nlmsg_report(nlh) && | |
3744 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
3745 | return 0; | |
3746 | ||
3747 | err = -ENOBUFS; | |
3748 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
3749 | if (skb2 == NULL) | |
3750 | goto err; | |
3751 | ||
3752 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
3753 | nlh->nlmsg_seq); | |
3754 | if (err < 0) { | |
3755 | kfree_skb(skb2); | |
3756 | goto err; | |
3757 | } | |
3758 | ||
3759 | err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, | |
3760 | NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL); | |
3761 | err: | |
3762 | if (err < 0) { | |
3763 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, | |
3764 | err); | |
3765 | } | |
3766 | return err; | |
3767 | } | |
3768 | ||
7b8002a1 PNA |
3769 | static int nf_tables_getgen(struct net *net, struct sock *nlsk, |
3770 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
84d7fce6 PNA |
3771 | const struct nlattr * const nla[]) |
3772 | { | |
84d7fce6 PNA |
3773 | struct sk_buff *skb2; |
3774 | int err; | |
3775 | ||
3776 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
3777 | if (skb2 == NULL) | |
3778 | return -ENOMEM; | |
3779 | ||
3780 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
3781 | nlh->nlmsg_seq); | |
3782 | if (err < 0) | |
3783 | goto err; | |
3784 | ||
3785 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
3786 | err: | |
3787 | kfree_skb(skb2); | |
3788 | return err; | |
3789 | } | |
3790 | ||
96518518 PM |
3791 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
3792 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 3793 | .call_batch = nf_tables_newtable, |
96518518 PM |
3794 | .attr_count = NFTA_TABLE_MAX, |
3795 | .policy = nft_table_policy, | |
3796 | }, | |
3797 | [NFT_MSG_GETTABLE] = { | |
3798 | .call = nf_tables_gettable, | |
3799 | .attr_count = NFTA_TABLE_MAX, | |
3800 | .policy = nft_table_policy, | |
3801 | }, | |
3802 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 3803 | .call_batch = nf_tables_deltable, |
96518518 PM |
3804 | .attr_count = NFTA_TABLE_MAX, |
3805 | .policy = nft_table_policy, | |
3806 | }, | |
3807 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 3808 | .call_batch = nf_tables_newchain, |
96518518 PM |
3809 | .attr_count = NFTA_CHAIN_MAX, |
3810 | .policy = nft_chain_policy, | |
3811 | }, | |
3812 | [NFT_MSG_GETCHAIN] = { | |
3813 | .call = nf_tables_getchain, | |
3814 | .attr_count = NFTA_CHAIN_MAX, | |
3815 | .policy = nft_chain_policy, | |
3816 | }, | |
3817 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 3818 | .call_batch = nf_tables_delchain, |
96518518 PM |
3819 | .attr_count = NFTA_CHAIN_MAX, |
3820 | .policy = nft_chain_policy, | |
3821 | }, | |
3822 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 3823 | .call_batch = nf_tables_newrule, |
96518518 PM |
3824 | .attr_count = NFTA_RULE_MAX, |
3825 | .policy = nft_rule_policy, | |
3826 | }, | |
3827 | [NFT_MSG_GETRULE] = { | |
3828 | .call = nf_tables_getrule, | |
3829 | .attr_count = NFTA_RULE_MAX, | |
3830 | .policy = nft_rule_policy, | |
3831 | }, | |
3832 | [NFT_MSG_DELRULE] = { | |
0628b123 | 3833 | .call_batch = nf_tables_delrule, |
96518518 PM |
3834 | .attr_count = NFTA_RULE_MAX, |
3835 | .policy = nft_rule_policy, | |
3836 | }, | |
20a69341 | 3837 | [NFT_MSG_NEWSET] = { |
958bee14 | 3838 | .call_batch = nf_tables_newset, |
20a69341 PM |
3839 | .attr_count = NFTA_SET_MAX, |
3840 | .policy = nft_set_policy, | |
3841 | }, | |
3842 | [NFT_MSG_GETSET] = { | |
3843 | .call = nf_tables_getset, | |
3844 | .attr_count = NFTA_SET_MAX, | |
3845 | .policy = nft_set_policy, | |
3846 | }, | |
3847 | [NFT_MSG_DELSET] = { | |
958bee14 | 3848 | .call_batch = nf_tables_delset, |
20a69341 PM |
3849 | .attr_count = NFTA_SET_MAX, |
3850 | .policy = nft_set_policy, | |
3851 | }, | |
3852 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 3853 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
3854 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
3855 | .policy = nft_set_elem_list_policy, | |
3856 | }, | |
3857 | [NFT_MSG_GETSETELEM] = { | |
3858 | .call = nf_tables_getsetelem, | |
3859 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
3860 | .policy = nft_set_elem_list_policy, | |
3861 | }, | |
3862 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 3863 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
3864 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
3865 | .policy = nft_set_elem_list_policy, | |
3866 | }, | |
84d7fce6 PNA |
3867 | [NFT_MSG_GETGEN] = { |
3868 | .call = nf_tables_getgen, | |
3869 | }, | |
96518518 PM |
3870 | }; |
3871 | ||
91c7b38d PNA |
3872 | static void nft_chain_commit_update(struct nft_trans *trans) |
3873 | { | |
3874 | struct nft_base_chain *basechain; | |
3875 | ||
3876 | if (nft_trans_chain_name(trans)[0]) | |
3877 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); | |
3878 | ||
3879 | if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN)) | |
3880 | return; | |
3881 | ||
3882 | basechain = nft_base_chain(trans->ctx.chain); | |
3883 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
3884 | ||
3885 | switch (nft_trans_chain_policy(trans)) { | |
3886 | case NF_DROP: | |
3887 | case NF_ACCEPT: | |
3888 | basechain->policy = nft_trans_chain_policy(trans); | |
3889 | break; | |
3890 | } | |
3891 | } | |
3892 | ||
b326dd37 | 3893 | static void nf_tables_commit_release(struct nft_trans *trans) |
c7c32e72 | 3894 | { |
c7c32e72 PNA |
3895 | switch (trans->msg_type) { |
3896 | case NFT_MSG_DELTABLE: | |
3897 | nf_tables_table_destroy(&trans->ctx); | |
3898 | break; | |
3899 | case NFT_MSG_DELCHAIN: | |
3900 | nf_tables_chain_destroy(trans->ctx.chain); | |
3901 | break; | |
3902 | case NFT_MSG_DELRULE: | |
3903 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
3904 | break; | |
3905 | case NFT_MSG_DELSET: | |
3906 | nft_set_destroy(nft_trans_set(trans)); | |
3907 | break; | |
61edafbb PM |
3908 | case NFT_MSG_DELSETELEM: |
3909 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
3910 | nft_trans_elem(trans).priv); | |
3911 | break; | |
c7c32e72 PNA |
3912 | } |
3913 | kfree(trans); | |
3914 | } | |
3915 | ||
5913beaf | 3916 | static int nf_tables_commit(struct net *net, struct sk_buff *skb) |
37082f93 | 3917 | { |
37082f93 | 3918 | struct nft_trans *trans, *next; |
a3716e70 | 3919 | struct nft_trans_elem *te; |
37082f93 PNA |
3920 | |
3921 | /* Bump generation counter, invalidate any dump in progress */ | |
38e029f1 | 3922 | while (++net->nft.base_seq == 0); |
37082f93 PNA |
3923 | |
3924 | /* A new generation has just started */ | |
ea4bd995 | 3925 | net->nft.gencursor = nft_gencursor_next(net); |
37082f93 PNA |
3926 | |
3927 | /* Make sure all packets have left the previous generation before | |
3928 | * purging old rules. | |
3929 | */ | |
3930 | synchronize_rcu(); | |
3931 | ||
3932 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 3933 | switch (trans->msg_type) { |
55dd6f93 PNA |
3934 | case NFT_MSG_NEWTABLE: |
3935 | if (nft_trans_table_update(trans)) { | |
3936 | if (!nft_trans_table_enable(trans)) { | |
3937 | nf_tables_table_disable(trans->ctx.afi, | |
3938 | trans->ctx.table); | |
3939 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
3940 | } | |
3941 | } else { | |
f2a6d766 | 3942 | nft_clear(net, trans->ctx.table); |
55dd6f93 | 3943 | } |
35151d84 | 3944 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
3945 | nft_trans_destroy(trans); |
3946 | break; | |
3947 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 3948 | list_del_rcu(&trans->ctx.table->list); |
35151d84 | 3949 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 3950 | break; |
91c7b38d PNA |
3951 | case NFT_MSG_NEWCHAIN: |
3952 | if (nft_trans_chain_update(trans)) | |
3953 | nft_chain_commit_update(trans); | |
4fefee57 | 3954 | else |
91c7b38d | 3955 | trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE; |
4fefee57 | 3956 | |
35151d84 | 3957 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
3958 | nft_trans_destroy(trans); |
3959 | break; | |
3960 | case NFT_MSG_DELCHAIN: | |
35151d84 | 3961 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
c5598794 AB |
3962 | nf_tables_unregister_hooks(trans->ctx.table, |
3963 | trans->ctx.chain, | |
3964 | trans->ctx.afi->nops); | |
91c7b38d | 3965 | break; |
b380e5c7 | 3966 | case NFT_MSG_NEWRULE: |
889f7ee7 | 3967 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
35151d84 | 3968 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 3969 | nft_trans_rule(trans), |
35151d84 | 3970 | NFT_MSG_NEWRULE); |
37082f93 | 3971 | nft_trans_destroy(trans); |
b380e5c7 PNA |
3972 | break; |
3973 | case NFT_MSG_DELRULE: | |
3974 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
3975 | nf_tables_rule_notify(&trans->ctx, |
3976 | nft_trans_rule(trans), | |
3977 | NFT_MSG_DELRULE); | |
b380e5c7 | 3978 | break; |
958bee14 PNA |
3979 | case NFT_MSG_NEWSET: |
3980 | nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE; | |
4fefee57 PNA |
3981 | /* This avoids hitting -EBUSY when deleting the table |
3982 | * from the transaction. | |
3983 | */ | |
3984 | if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS && | |
3985 | !list_empty(&nft_trans_set(trans)->bindings)) | |
3986 | trans->ctx.table->use--; | |
3987 | ||
958bee14 | 3988 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 3989 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
3990 | nft_trans_destroy(trans); |
3991 | break; | |
3992 | case NFT_MSG_DELSET: | |
3993 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), | |
31f8441c | 3994 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 3995 | break; |
60319eb1 | 3996 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
3997 | te = (struct nft_trans_elem *)trans->data; |
3998 | ||
3999 | te->set->ops->activate(te->set, &te->elem); | |
4000 | nf_tables_setelem_notify(&trans->ctx, te->set, | |
4001 | &te->elem, | |
60319eb1 PNA |
4002 | NFT_MSG_NEWSETELEM, 0); |
4003 | nft_trans_destroy(trans); | |
4004 | break; | |
4005 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 4006 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 4007 | |
a3716e70 PNA |
4008 | nf_tables_setelem_notify(&trans->ctx, te->set, |
4009 | &te->elem, | |
60319eb1 | 4010 | NFT_MSG_DELSETELEM, 0); |
02263db0 | 4011 | te->set->ops->remove(te->set, &te->elem); |
3dd0673a PM |
4012 | atomic_dec(&te->set->nelems); |
4013 | te->set->ndeact--; | |
60319eb1 | 4014 | break; |
37082f93 | 4015 | } |
37082f93 PNA |
4016 | } |
4017 | ||
b326dd37 PNA |
4018 | synchronize_rcu(); |
4019 | ||
37082f93 | 4020 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 | 4021 | list_del(&trans->list); |
b326dd37 | 4022 | nf_tables_commit_release(trans); |
37082f93 | 4023 | } |
84d7fce6 PNA |
4024 | |
4025 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); | |
37082f93 PNA |
4026 | |
4027 | return 0; | |
4028 | } | |
4029 | ||
b326dd37 | 4030 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 4031 | { |
c7c32e72 PNA |
4032 | switch (trans->msg_type) { |
4033 | case NFT_MSG_NEWTABLE: | |
4034 | nf_tables_table_destroy(&trans->ctx); | |
4035 | break; | |
4036 | case NFT_MSG_NEWCHAIN: | |
4037 | nf_tables_chain_destroy(trans->ctx.chain); | |
4038 | break; | |
4039 | case NFT_MSG_NEWRULE: | |
4040 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
4041 | break; | |
4042 | case NFT_MSG_NEWSET: | |
4043 | nft_set_destroy(nft_trans_set(trans)); | |
4044 | break; | |
61edafbb PM |
4045 | case NFT_MSG_NEWSETELEM: |
4046 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
4047 | nft_trans_elem(trans).priv); | |
4048 | break; | |
c7c32e72 PNA |
4049 | } |
4050 | kfree(trans); | |
4051 | } | |
4052 | ||
5913beaf | 4053 | static int nf_tables_abort(struct net *net, struct sk_buff *skb) |
37082f93 | 4054 | { |
37082f93 | 4055 | struct nft_trans *trans, *next; |
02263db0 | 4056 | struct nft_trans_elem *te; |
37082f93 | 4057 | |
a907e36d XL |
4058 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
4059 | list) { | |
b380e5c7 | 4060 | switch (trans->msg_type) { |
55dd6f93 PNA |
4061 | case NFT_MSG_NEWTABLE: |
4062 | if (nft_trans_table_update(trans)) { | |
4063 | if (nft_trans_table_enable(trans)) { | |
4064 | nf_tables_table_disable(trans->ctx.afi, | |
4065 | trans->ctx.table); | |
4066 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
4067 | } | |
4068 | nft_trans_destroy(trans); | |
4069 | } else { | |
e688a7f8 | 4070 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
4071 | } |
4072 | break; | |
4073 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 4074 | nft_clear(trans->ctx.net, trans->ctx.table); |
55dd6f93 PNA |
4075 | nft_trans_destroy(trans); |
4076 | break; | |
91c7b38d PNA |
4077 | case NFT_MSG_NEWCHAIN: |
4078 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 4079 | free_percpu(nft_trans_chain_stats(trans)); |
91c7b38d PNA |
4080 | |
4081 | nft_trans_destroy(trans); | |
4082 | } else { | |
4fefee57 | 4083 | trans->ctx.table->use--; |
e688a7f8 | 4084 | list_del_rcu(&trans->ctx.chain->list); |
c5598794 AB |
4085 | nf_tables_unregister_hooks(trans->ctx.table, |
4086 | trans->ctx.chain, | |
4087 | trans->ctx.afi->nops); | |
91c7b38d PNA |
4088 | } |
4089 | break; | |
4090 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 4091 | trans->ctx.table->use++; |
e688a7f8 PNA |
4092 | list_add_tail_rcu(&trans->ctx.chain->list, |
4093 | &trans->ctx.table->chains); | |
91c7b38d PNA |
4094 | nft_trans_destroy(trans); |
4095 | break; | |
b380e5c7 | 4096 | case NFT_MSG_NEWRULE: |
4fefee57 | 4097 | trans->ctx.chain->use--; |
b380e5c7 PNA |
4098 | list_del_rcu(&nft_trans_rule(trans)->list); |
4099 | break; | |
4100 | case NFT_MSG_DELRULE: | |
4fefee57 | 4101 | trans->ctx.chain->use++; |
889f7ee7 | 4102 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
37082f93 | 4103 | nft_trans_destroy(trans); |
b380e5c7 | 4104 | break; |
958bee14 | 4105 | case NFT_MSG_NEWSET: |
4fefee57 | 4106 | trans->ctx.table->use--; |
e688a7f8 | 4107 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
4108 | break; |
4109 | case NFT_MSG_DELSET: | |
4fefee57 | 4110 | trans->ctx.table->use++; |
e688a7f8 PNA |
4111 | list_add_tail_rcu(&nft_trans_set(trans)->list, |
4112 | &trans->ctx.table->sets); | |
958bee14 PNA |
4113 | nft_trans_destroy(trans); |
4114 | break; | |
60319eb1 | 4115 | case NFT_MSG_NEWSETELEM: |
02263db0 | 4116 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 4117 | |
02263db0 | 4118 | te->set->ops->remove(te->set, &te->elem); |
3dd0673a | 4119 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
4120 | break; |
4121 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
4122 | te = (struct nft_trans_elem *)trans->data; |
4123 | ||
cc02e457 | 4124 | te->set->ops->activate(te->set, &te->elem); |
3dd0673a | 4125 | te->set->ndeact--; |
cc02e457 | 4126 | |
60319eb1 PNA |
4127 | nft_trans_destroy(trans); |
4128 | break; | |
37082f93 | 4129 | } |
37082f93 PNA |
4130 | } |
4131 | ||
b326dd37 PNA |
4132 | synchronize_rcu(); |
4133 | ||
a1cee076 PNA |
4134 | list_for_each_entry_safe_reverse(trans, next, |
4135 | &net->nft.commit_list, list) { | |
c7c32e72 | 4136 | list_del(&trans->list); |
b326dd37 | 4137 | nf_tables_abort_release(trans); |
37082f93 PNA |
4138 | } |
4139 | ||
4140 | return 0; | |
4141 | } | |
4142 | ||
96518518 PM |
4143 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
4144 | .name = "nf_tables", | |
4145 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
4146 | .cb_count = NFT_MSG_MAX, | |
4147 | .cb = nf_tables_cb, | |
0628b123 PNA |
4148 | .commit = nf_tables_commit, |
4149 | .abort = nf_tables_abort, | |
96518518 PM |
4150 | }; |
4151 | ||
7210e4e3 PNA |
4152 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
4153 | enum nft_chain_type type) | |
4154 | { | |
4155 | const struct nft_base_chain *basechain; | |
4156 | ||
4157 | if (chain->flags & NFT_BASE_CHAIN) { | |
4158 | basechain = nft_base_chain(chain); | |
4159 | if (basechain->type->type != type) | |
4160 | return -EOPNOTSUPP; | |
4161 | } | |
4162 | return 0; | |
4163 | } | |
4164 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
4165 | ||
75e8d06d PNA |
4166 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
4167 | unsigned int hook_flags) | |
4168 | { | |
4169 | struct nft_base_chain *basechain; | |
4170 | ||
4171 | if (chain->flags & NFT_BASE_CHAIN) { | |
4172 | basechain = nft_base_chain(chain); | |
4173 | ||
4174 | if ((1 << basechain->ops[0].hooknum) & hook_flags) | |
4175 | return 0; | |
4176 | ||
4177 | return -EOPNOTSUPP; | |
4178 | } | |
4179 | ||
4180 | return 0; | |
4181 | } | |
4182 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
4183 | ||
20a69341 PM |
4184 | /* |
4185 | * Loop detection - walk through the ruleset beginning at the destination chain | |
4186 | * of a new jump until either the source chain is reached (loop) or all | |
4187 | * reachable chains have been traversed. | |
4188 | * | |
4189 | * The loop check is performed whenever a new jump verdict is added to an | |
4190 | * expression or verdict map or a verdict map is bound to a new chain. | |
4191 | */ | |
4192 | ||
4193 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
4194 | const struct nft_chain *chain); | |
4195 | ||
4196 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
4197 | const struct nft_set *set, | |
4198 | const struct nft_set_iter *iter, | |
4199 | const struct nft_set_elem *elem) | |
4200 | { | |
fe2811eb PM |
4201 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
4202 | const struct nft_data *data; | |
4203 | ||
4204 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
4205 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
4206 | return 0; |
4207 | ||
fe2811eb | 4208 | data = nft_set_ext_data(ext); |
1ca2e170 | 4209 | switch (data->verdict.code) { |
20a69341 PM |
4210 | case NFT_JUMP: |
4211 | case NFT_GOTO: | |
1ca2e170 | 4212 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
4213 | default: |
4214 | return 0; | |
4215 | } | |
4216 | } | |
4217 | ||
4218 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
4219 | const struct nft_chain *chain) | |
4220 | { | |
4221 | const struct nft_rule *rule; | |
4222 | const struct nft_expr *expr, *last; | |
20a69341 PM |
4223 | const struct nft_set *set; |
4224 | struct nft_set_binding *binding; | |
4225 | struct nft_set_iter iter; | |
20a69341 PM |
4226 | |
4227 | if (ctx->chain == chain) | |
4228 | return -ELOOP; | |
4229 | ||
4230 | list_for_each_entry(rule, &chain->rules, list) { | |
4231 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
4232 | const struct nft_data *data = NULL; |
4233 | int err; | |
4234 | ||
4235 | if (!expr->ops->validate) | |
20a69341 PM |
4236 | continue; |
4237 | ||
0ca743a5 PNA |
4238 | err = expr->ops->validate(ctx, expr, &data); |
4239 | if (err < 0) | |
4240 | return err; | |
4241 | ||
20a69341 | 4242 | if (data == NULL) |
0ca743a5 | 4243 | continue; |
20a69341 | 4244 | |
1ca2e170 | 4245 | switch (data->verdict.code) { |
20a69341 PM |
4246 | case NFT_JUMP: |
4247 | case NFT_GOTO: | |
1ca2e170 PM |
4248 | err = nf_tables_check_loops(ctx, |
4249 | data->verdict.chain); | |
20a69341 PM |
4250 | if (err < 0) |
4251 | return err; | |
4252 | default: | |
4253 | break; | |
4254 | } | |
4255 | } | |
4256 | } | |
4257 | ||
4258 | list_for_each_entry(set, &ctx->table->sets, list) { | |
4259 | if (!(set->flags & NFT_SET_MAP) || | |
4260 | set->dtype != NFT_DATA_VERDICT) | |
4261 | continue; | |
4262 | ||
4263 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
4264 | if (!(binding->flags & NFT_SET_MAP) || |
4265 | binding->chain != chain) | |
20a69341 PM |
4266 | continue; |
4267 | ||
4268 | iter.skip = 0; | |
4269 | iter.count = 0; | |
4270 | iter.err = 0; | |
4271 | iter.fn = nf_tables_loop_check_setelem; | |
4272 | ||
4273 | set->ops->walk(ctx, set, &iter); | |
4274 | if (iter.err < 0) | |
4275 | return iter.err; | |
4276 | } | |
4277 | } | |
4278 | ||
4279 | return 0; | |
4280 | } | |
4281 | ||
49499c3e PM |
4282 | /** |
4283 | * nft_parse_register - parse a register value from a netlink attribute | |
4284 | * | |
4285 | * @attr: netlink attribute | |
4286 | * | |
4287 | * Parse and translate a register value from a netlink attribute. | |
4288 | * Registers used to be 128 bit wide, these register numbers will be | |
4289 | * mapped to the corresponding 32 bit register numbers. | |
4290 | */ | |
b1c96ed3 PM |
4291 | unsigned int nft_parse_register(const struct nlattr *attr) |
4292 | { | |
49499c3e PM |
4293 | unsigned int reg; |
4294 | ||
4295 | reg = ntohl(nla_get_be32(attr)); | |
4296 | switch (reg) { | |
4297 | case NFT_REG_VERDICT...NFT_REG_4: | |
4298 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
4299 | default: | |
4300 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
4301 | } | |
b1c96ed3 PM |
4302 | } |
4303 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
4304 | ||
49499c3e PM |
4305 | /** |
4306 | * nft_dump_register - dump a register value to a netlink attribute | |
4307 | * | |
4308 | * @skb: socket buffer | |
4309 | * @attr: attribute number | |
4310 | * @reg: register number | |
4311 | * | |
4312 | * Construct a netlink attribute containing the register number. For | |
4313 | * compatibility reasons, register numbers being a multiple of 4 are | |
4314 | * translated to the corresponding 128 bit register numbers. | |
4315 | */ | |
b1c96ed3 PM |
4316 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
4317 | { | |
49499c3e PM |
4318 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
4319 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
4320 | else | |
4321 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
4322 | ||
b1c96ed3 PM |
4323 | return nla_put_be32(skb, attr, htonl(reg)); |
4324 | } | |
4325 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
4326 | ||
96518518 | 4327 | /** |
d07db988 | 4328 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
4329 | * |
4330 | * @reg: the register number | |
d07db988 | 4331 | * @len: the length of the data |
96518518 PM |
4332 | * |
4333 | * Validate that the input register is one of the general purpose | |
d07db988 | 4334 | * registers and that the length of the load is within the bounds. |
96518518 | 4335 | */ |
d07db988 | 4336 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 4337 | { |
49499c3e | 4338 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 4339 | return -EINVAL; |
d07db988 PM |
4340 | if (len == 0) |
4341 | return -EINVAL; | |
49499c3e | 4342 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 4343 | return -ERANGE; |
49499c3e | 4344 | |
96518518 PM |
4345 | return 0; |
4346 | } | |
d07db988 | 4347 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 4348 | |
96518518 | 4349 | /** |
1ec10212 | 4350 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
4351 | * |
4352 | * @ctx: context of the expression performing the load | |
4353 | * @reg: the destination register number | |
4354 | * @data: the data to load | |
4355 | * @type: the data type | |
45d9bcda | 4356 | * @len: the length of the data |
96518518 PM |
4357 | * |
4358 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
4359 | * the destination register and the length is within the bounds. |
4360 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 4361 | * data. |
96518518 | 4362 | */ |
1ec10212 PM |
4363 | int nft_validate_register_store(const struct nft_ctx *ctx, |
4364 | enum nft_registers reg, | |
4365 | const struct nft_data *data, | |
4366 | enum nft_data_types type, unsigned int len) | |
96518518 | 4367 | { |
20a69341 PM |
4368 | int err; |
4369 | ||
96518518 PM |
4370 | switch (reg) { |
4371 | case NFT_REG_VERDICT: | |
58f40ab6 | 4372 | if (type != NFT_DATA_VERDICT) |
96518518 | 4373 | return -EINVAL; |
20a69341 | 4374 | |
58f40ab6 | 4375 | if (data != NULL && |
1ca2e170 PM |
4376 | (data->verdict.code == NFT_GOTO || |
4377 | data->verdict.code == NFT_JUMP)) { | |
4378 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
4379 | if (err < 0) |
4380 | return err; | |
4381 | ||
1ca2e170 PM |
4382 | if (ctx->chain->level + 1 > |
4383 | data->verdict.chain->level) { | |
20a69341 PM |
4384 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
4385 | return -EMLINK; | |
1ca2e170 | 4386 | data->verdict.chain->level = ctx->chain->level + 1; |
20a69341 PM |
4387 | } |
4388 | } | |
4389 | ||
96518518 PM |
4390 | return 0; |
4391 | default: | |
49499c3e | 4392 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 4393 | return -EINVAL; |
45d9bcda PM |
4394 | if (len == 0) |
4395 | return -EINVAL; | |
49499c3e PM |
4396 | if (reg * NFT_REG32_SIZE + len > |
4397 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 4398 | return -ERANGE; |
27e6d201 | 4399 | |
96518518 PM |
4400 | if (data != NULL && type != NFT_DATA_VALUE) |
4401 | return -EINVAL; | |
4402 | return 0; | |
4403 | } | |
4404 | } | |
1ec10212 | 4405 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
4406 | |
4407 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
4408 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
4409 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
4410 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
4411 | }; | |
4412 | ||
4413 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
4414 | struct nft_data_desc *desc, const struct nlattr *nla) | |
4415 | { | |
4416 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; | |
4417 | struct nft_chain *chain; | |
4418 | int err; | |
4419 | ||
4420 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); | |
4421 | if (err < 0) | |
4422 | return err; | |
4423 | ||
4424 | if (!tb[NFTA_VERDICT_CODE]) | |
4425 | return -EINVAL; | |
1ca2e170 | 4426 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 4427 | |
1ca2e170 | 4428 | switch (data->verdict.code) { |
e0abdadc | 4429 | default: |
1ca2e170 | 4430 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
4431 | case NF_ACCEPT: |
4432 | case NF_DROP: | |
4433 | case NF_QUEUE: | |
4434 | break; | |
4435 | default: | |
4436 | return -EINVAL; | |
4437 | } | |
4438 | /* fall through */ | |
96518518 PM |
4439 | case NFT_CONTINUE: |
4440 | case NFT_BREAK: | |
4441 | case NFT_RETURN: | |
96518518 PM |
4442 | break; |
4443 | case NFT_JUMP: | |
4444 | case NFT_GOTO: | |
4445 | if (!tb[NFTA_VERDICT_CHAIN]) | |
4446 | return -EINVAL; | |
4447 | chain = nf_tables_chain_lookup(ctx->table, | |
4448 | tb[NFTA_VERDICT_CHAIN]); | |
4449 | if (IS_ERR(chain)) | |
4450 | return PTR_ERR(chain); | |
4451 | if (chain->flags & NFT_BASE_CHAIN) | |
4452 | return -EOPNOTSUPP; | |
4453 | ||
96518518 | 4454 | chain->use++; |
1ca2e170 | 4455 | data->verdict.chain = chain; |
96518518 | 4456 | break; |
96518518 PM |
4457 | } |
4458 | ||
4c4ed074 | 4459 | desc->len = sizeof(data->verdict); |
96518518 PM |
4460 | desc->type = NFT_DATA_VERDICT; |
4461 | return 0; | |
4462 | } | |
4463 | ||
4464 | static void nft_verdict_uninit(const struct nft_data *data) | |
4465 | { | |
1ca2e170 | 4466 | switch (data->verdict.code) { |
96518518 PM |
4467 | case NFT_JUMP: |
4468 | case NFT_GOTO: | |
1ca2e170 | 4469 | data->verdict.chain->use--; |
96518518 PM |
4470 | break; |
4471 | } | |
4472 | } | |
4473 | ||
33d5a7b1 | 4474 | int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) |
96518518 PM |
4475 | { |
4476 | struct nlattr *nest; | |
4477 | ||
33d5a7b1 | 4478 | nest = nla_nest_start(skb, type); |
96518518 PM |
4479 | if (!nest) |
4480 | goto nla_put_failure; | |
4481 | ||
33d5a7b1 | 4482 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) |
96518518 PM |
4483 | goto nla_put_failure; |
4484 | ||
33d5a7b1 | 4485 | switch (v->code) { |
96518518 PM |
4486 | case NFT_JUMP: |
4487 | case NFT_GOTO: | |
1ca2e170 | 4488 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
33d5a7b1 | 4489 | v->chain->name)) |
96518518 PM |
4490 | goto nla_put_failure; |
4491 | } | |
4492 | nla_nest_end(skb, nest); | |
4493 | return 0; | |
4494 | ||
4495 | nla_put_failure: | |
4496 | return -1; | |
4497 | } | |
4498 | ||
d0a11fc3 PM |
4499 | static int nft_value_init(const struct nft_ctx *ctx, |
4500 | struct nft_data *data, unsigned int size, | |
96518518 PM |
4501 | struct nft_data_desc *desc, const struct nlattr *nla) |
4502 | { | |
4503 | unsigned int len; | |
4504 | ||
4505 | len = nla_len(nla); | |
4506 | if (len == 0) | |
4507 | return -EINVAL; | |
d0a11fc3 | 4508 | if (len > size) |
96518518 PM |
4509 | return -EOVERFLOW; |
4510 | ||
d0a11fc3 | 4511 | nla_memcpy(data->data, nla, len); |
96518518 PM |
4512 | desc->type = NFT_DATA_VALUE; |
4513 | desc->len = len; | |
4514 | return 0; | |
4515 | } | |
4516 | ||
4517 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
4518 | unsigned int len) | |
4519 | { | |
4520 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
4521 | } | |
4522 | ||
4523 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 4524 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
4525 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
4526 | }; | |
4527 | ||
4528 | /** | |
4529 | * nft_data_init - parse nf_tables data netlink attributes | |
4530 | * | |
4531 | * @ctx: context of the expression using the data | |
4532 | * @data: destination struct nft_data | |
d0a11fc3 | 4533 | * @size: maximum data length |
96518518 PM |
4534 | * @desc: data description |
4535 | * @nla: netlink attribute containing data | |
4536 | * | |
4537 | * Parse the netlink data attributes and initialize a struct nft_data. | |
4538 | * The type and length of data are returned in the data description. | |
4539 | * | |
4540 | * The caller can indicate that it only wants to accept data of type | |
4541 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
4542 | */ | |
d0a11fc3 PM |
4543 | int nft_data_init(const struct nft_ctx *ctx, |
4544 | struct nft_data *data, unsigned int size, | |
96518518 PM |
4545 | struct nft_data_desc *desc, const struct nlattr *nla) |
4546 | { | |
4547 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
4548 | int err; | |
4549 | ||
4550 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); | |
4551 | if (err < 0) | |
4552 | return err; | |
4553 | ||
4554 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
4555 | return nft_value_init(ctx, data, size, desc, |
4556 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
4557 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
4558 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
4559 | return -EINVAL; | |
4560 | } | |
4561 | EXPORT_SYMBOL_GPL(nft_data_init); | |
4562 | ||
4563 | /** | |
4564 | * nft_data_uninit - release a nft_data item | |
4565 | * | |
4566 | * @data: struct nft_data to release | |
4567 | * @type: type of data | |
4568 | * | |
4569 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
4570 | * all others need to be released by calling this function. | |
4571 | */ | |
4572 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) | |
4573 | { | |
960bd2c2 | 4574 | if (type < NFT_DATA_VERDICT) |
96518518 | 4575 | return; |
960bd2c2 | 4576 | switch (type) { |
96518518 PM |
4577 | case NFT_DATA_VERDICT: |
4578 | return nft_verdict_uninit(data); | |
4579 | default: | |
4580 | WARN_ON(1); | |
4581 | } | |
4582 | } | |
4583 | EXPORT_SYMBOL_GPL(nft_data_uninit); | |
4584 | ||
4585 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
4586 | enum nft_data_types type, unsigned int len) | |
4587 | { | |
4588 | struct nlattr *nest; | |
4589 | int err; | |
4590 | ||
4591 | nest = nla_nest_start(skb, attr); | |
4592 | if (nest == NULL) | |
4593 | return -1; | |
4594 | ||
4595 | switch (type) { | |
4596 | case NFT_DATA_VALUE: | |
4597 | err = nft_value_dump(skb, data, len); | |
4598 | break; | |
4599 | case NFT_DATA_VERDICT: | |
33d5a7b1 | 4600 | err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); |
96518518 PM |
4601 | break; |
4602 | default: | |
4603 | err = -EINVAL; | |
4604 | WARN_ON(1); | |
4605 | } | |
4606 | ||
4607 | nla_nest_end(skb, nest); | |
4608 | return err; | |
4609 | } | |
4610 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
4611 | ||
df05ef87 | 4612 | static int __net_init nf_tables_init_net(struct net *net) |
99633ab2 PNA |
4613 | { |
4614 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 4615 | INIT_LIST_HEAD(&net->nft.commit_list); |
38e029f1 | 4616 | net->nft.base_seq = 1; |
99633ab2 PNA |
4617 | return 0; |
4618 | } | |
4619 | ||
5ebe0b0e PNA |
4620 | int __nft_release_basechain(struct nft_ctx *ctx) |
4621 | { | |
4622 | struct nft_rule *rule, *nr; | |
4623 | ||
4624 | BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN)); | |
4625 | ||
4626 | nf_tables_unregister_hooks(ctx->chain->table, ctx->chain, | |
4627 | ctx->afi->nops); | |
4628 | list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { | |
4629 | list_del(&rule->list); | |
4630 | ctx->chain->use--; | |
4631 | nf_tables_rule_destroy(ctx, rule); | |
4632 | } | |
4633 | list_del(&ctx->chain->list); | |
4634 | ctx->table->use--; | |
4635 | nf_tables_chain_destroy(ctx->chain); | |
4636 | ||
4637 | return 0; | |
4638 | } | |
4639 | EXPORT_SYMBOL_GPL(__nft_release_basechain); | |
4640 | ||
df05ef87 PNA |
4641 | /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */ |
4642 | static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi) | |
4643 | { | |
4644 | struct nft_table *table, *nt; | |
4645 | struct nft_chain *chain, *nc; | |
4646 | struct nft_rule *rule, *nr; | |
4647 | struct nft_set *set, *ns; | |
4648 | struct nft_ctx ctx = { | |
4649 | .net = net, | |
4650 | .afi = afi, | |
4651 | }; | |
4652 | ||
4653 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
4654 | list_for_each_entry(chain, &table->chains, list) | |
4655 | nf_tables_unregister_hooks(table, chain, afi->nops); | |
4656 | /* No packets are walking on these chains anymore. */ | |
4657 | ctx.table = table; | |
4658 | list_for_each_entry(chain, &table->chains, list) { | |
4659 | ctx.chain = chain; | |
4660 | list_for_each_entry_safe(rule, nr, &chain->rules, list) { | |
4661 | list_del(&rule->list); | |
4662 | chain->use--; | |
4663 | nf_tables_rule_destroy(&ctx, rule); | |
4664 | } | |
4665 | } | |
4666 | list_for_each_entry_safe(set, ns, &table->sets, list) { | |
4667 | list_del(&set->list); | |
4668 | table->use--; | |
4669 | nft_set_destroy(set); | |
4670 | } | |
4671 | list_for_each_entry_safe(chain, nc, &table->chains, list) { | |
4672 | list_del(&chain->list); | |
4673 | table->use--; | |
4674 | nf_tables_chain_destroy(chain); | |
4675 | } | |
4676 | list_del(&table->list); | |
4677 | nf_tables_table_destroy(&ctx); | |
4678 | } | |
4679 | } | |
4680 | ||
99633ab2 PNA |
4681 | static struct pernet_operations nf_tables_net_ops = { |
4682 | .init = nf_tables_init_net, | |
4683 | }; | |
4684 | ||
96518518 PM |
4685 | static int __init nf_tables_module_init(void) |
4686 | { | |
4687 | int err; | |
4688 | ||
4689 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
4690 | GFP_KERNEL); | |
4691 | if (info == NULL) { | |
4692 | err = -ENOMEM; | |
4693 | goto err1; | |
4694 | } | |
4695 | ||
4696 | err = nf_tables_core_module_init(); | |
4697 | if (err < 0) | |
4698 | goto err2; | |
4699 | ||
4700 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
4701 | if (err < 0) | |
4702 | goto err3; | |
4703 | ||
4704 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 4705 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
4706 | err3: |
4707 | nf_tables_core_module_exit(); | |
4708 | err2: | |
4709 | kfree(info); | |
4710 | err1: | |
4711 | return err; | |
4712 | } | |
4713 | ||
4714 | static void __exit nf_tables_module_exit(void) | |
4715 | { | |
99633ab2 | 4716 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 | 4717 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
1b1bc49c | 4718 | rcu_barrier(); |
96518518 PM |
4719 | nf_tables_core_module_exit(); |
4720 | kfree(info); | |
4721 | } | |
4722 | ||
4723 | module_init(nf_tables_module_init); | |
4724 | module_exit(nf_tables_module_exit); | |
4725 | ||
4726 | MODULE_LICENSE("GPL"); | |
4727 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
4728 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |