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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 | 24 | static LIST_HEAD(nf_tables_expressions); |
e5009240 | 25 | static LIST_HEAD(nf_tables_objects); |
96518518 PM |
26 | |
27 | /** | |
28 | * nft_register_afinfo - register nf_tables address family info | |
29 | * | |
30 | * @afi: address family info to register | |
31 | * | |
32 | * Register the address family for use with nf_tables. Returns zero on | |
33 | * success or a negative errno code otherwise. | |
34 | */ | |
99633ab2 | 35 | int nft_register_afinfo(struct net *net, struct nft_af_info *afi) |
96518518 PM |
36 | { |
37 | INIT_LIST_HEAD(&afi->tables); | |
38 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 39 | list_add_tail_rcu(&afi->list, &net->nft.af_info); |
96518518 PM |
40 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
41 | return 0; | |
42 | } | |
43 | EXPORT_SYMBOL_GPL(nft_register_afinfo); | |
44 | ||
df05ef87 PNA |
45 | static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi); |
46 | ||
96518518 PM |
47 | /** |
48 | * nft_unregister_afinfo - unregister nf_tables address family info | |
49 | * | |
50 | * @afi: address family info to unregister | |
51 | * | |
52 | * Unregister the address family for use with nf_tables. | |
53 | */ | |
df05ef87 | 54 | void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi) |
96518518 PM |
55 | { |
56 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
df05ef87 | 57 | __nft_release_afinfo(net, afi); |
e688a7f8 | 58 | list_del_rcu(&afi->list); |
96518518 PM |
59 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
60 | } | |
61 | EXPORT_SYMBOL_GPL(nft_unregister_afinfo); | |
62 | ||
99633ab2 | 63 | static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family) |
96518518 PM |
64 | { |
65 | struct nft_af_info *afi; | |
66 | ||
99633ab2 | 67 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
68 | if (afi->family == family) |
69 | return afi; | |
70 | } | |
71 | return NULL; | |
72 | } | |
73 | ||
99633ab2 PNA |
74 | static struct nft_af_info * |
75 | nf_tables_afinfo_lookup(struct net *net, int family, bool autoload) | |
96518518 PM |
76 | { |
77 | struct nft_af_info *afi; | |
78 | ||
99633ab2 | 79 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
80 | if (afi != NULL) |
81 | return afi; | |
82 | #ifdef CONFIG_MODULES | |
83 | if (autoload) { | |
84 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
85 | request_module("nft-afinfo-%u", family); | |
86 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
99633ab2 | 87 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
88 | if (afi != NULL) |
89 | return ERR_PTR(-EAGAIN); | |
90 | } | |
91 | #endif | |
92 | return ERR_PTR(-EAFNOSUPPORT); | |
93 | } | |
94 | ||
7c95f6d8 | 95 | static void nft_ctx_init(struct nft_ctx *ctx, |
633c9a84 | 96 | struct net *net, |
7c95f6d8 PNA |
97 | const struct sk_buff *skb, |
98 | const struct nlmsghdr *nlh, | |
99 | struct nft_af_info *afi, | |
100 | struct nft_table *table, | |
101 | struct nft_chain *chain, | |
102 | const struct nlattr * const *nla) | |
103 | { | |
633c9a84 | 104 | ctx->net = net; |
128ad332 PNA |
105 | ctx->afi = afi; |
106 | ctx->table = table; | |
107 | ctx->chain = chain; | |
108 | ctx->nla = nla; | |
109 | ctx->portid = NETLINK_CB(skb).portid; | |
110 | ctx->report = nlmsg_report(nlh); | |
111 | ctx->seq = nlh->nlmsg_seq; | |
7c95f6d8 PNA |
112 | } |
113 | ||
8411b644 PNA |
114 | static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx, |
115 | int msg_type, u32 size, gfp_t gfp) | |
1081d11b PNA |
116 | { |
117 | struct nft_trans *trans; | |
118 | ||
8411b644 | 119 | trans = kzalloc(sizeof(struct nft_trans) + size, gfp); |
1081d11b PNA |
120 | if (trans == NULL) |
121 | return NULL; | |
122 | ||
b380e5c7 | 123 | trans->msg_type = msg_type; |
1081d11b PNA |
124 | trans->ctx = *ctx; |
125 | ||
126 | return trans; | |
127 | } | |
128 | ||
8411b644 PNA |
129 | static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx, |
130 | int msg_type, u32 size) | |
131 | { | |
132 | return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL); | |
133 | } | |
134 | ||
1081d11b PNA |
135 | static void nft_trans_destroy(struct nft_trans *trans) |
136 | { | |
137 | list_del(&trans->list); | |
138 | kfree(trans); | |
139 | } | |
140 | ||
82bec71d PNA |
141 | static int nf_tables_register_hooks(struct net *net, |
142 | const struct nft_table *table, | |
d8ee8f7c PNA |
143 | struct nft_chain *chain, |
144 | unsigned int hook_nops) | |
145 | { | |
146 | if (table->flags & NFT_TABLE_F_DORMANT || | |
147 | !(chain->flags & NFT_BASE_CHAIN)) | |
148 | return 0; | |
149 | ||
82bec71d PNA |
150 | return nf_register_net_hooks(net, nft_base_chain(chain)->ops, |
151 | hook_nops); | |
d8ee8f7c PNA |
152 | } |
153 | ||
82bec71d PNA |
154 | static void nf_tables_unregister_hooks(struct net *net, |
155 | const struct nft_table *table, | |
d8ee8f7c | 156 | struct nft_chain *chain, |
c5598794 AB |
157 | unsigned int hook_nops) |
158 | { | |
d8ee8f7c PNA |
159 | if (table->flags & NFT_TABLE_F_DORMANT || |
160 | !(chain->flags & NFT_BASE_CHAIN)) | |
161 | return; | |
162 | ||
82bec71d | 163 | nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops); |
c5598794 AB |
164 | } |
165 | ||
ee01d542 AB |
166 | static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) |
167 | { | |
168 | struct nft_trans *trans; | |
169 | ||
170 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); | |
171 | if (trans == NULL) | |
172 | return -ENOMEM; | |
173 | ||
174 | if (msg_type == NFT_MSG_NEWTABLE) | |
f2a6d766 | 175 | nft_activate_next(ctx->net, ctx->table); |
ee01d542 AB |
176 | |
177 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int nft_deltable(struct nft_ctx *ctx) | |
182 | { | |
183 | int err; | |
184 | ||
185 | err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); | |
186 | if (err < 0) | |
187 | return err; | |
188 | ||
f2a6d766 | 189 | nft_deactivate_next(ctx->net, ctx->table); |
ee01d542 AB |
190 | return err; |
191 | } | |
192 | ||
193 | static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) | |
194 | { | |
195 | struct nft_trans *trans; | |
196 | ||
197 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); | |
198 | if (trans == NULL) | |
199 | return -ENOMEM; | |
200 | ||
201 | if (msg_type == NFT_MSG_NEWCHAIN) | |
664b0f8c | 202 | nft_activate_next(ctx->net, ctx->chain); |
ee01d542 AB |
203 | |
204 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static int nft_delchain(struct nft_ctx *ctx) | |
209 | { | |
210 | int err; | |
211 | ||
212 | err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); | |
213 | if (err < 0) | |
214 | return err; | |
215 | ||
216 | ctx->table->use--; | |
664b0f8c | 217 | nft_deactivate_next(ctx->net, ctx->chain); |
ee01d542 AB |
218 | |
219 | return err; | |
220 | } | |
221 | ||
ee01d542 AB |
222 | static int |
223 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) | |
224 | { | |
225 | /* You cannot delete the same rule twice */ | |
889f7ee7 PNA |
226 | if (nft_is_active_next(ctx->net, rule)) { |
227 | nft_deactivate_next(ctx->net, rule); | |
ee01d542 AB |
228 | ctx->chain->use--; |
229 | return 0; | |
230 | } | |
231 | return -ENOENT; | |
232 | } | |
233 | ||
234 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, | |
235 | struct nft_rule *rule) | |
236 | { | |
237 | struct nft_trans *trans; | |
238 | ||
239 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); | |
240 | if (trans == NULL) | |
241 | return NULL; | |
242 | ||
243 | nft_trans_rule(trans) = rule; | |
244 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
245 | ||
246 | return trans; | |
247 | } | |
248 | ||
249 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) | |
250 | { | |
251 | struct nft_trans *trans; | |
252 | int err; | |
253 | ||
254 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); | |
255 | if (trans == NULL) | |
256 | return -ENOMEM; | |
257 | ||
258 | err = nf_tables_delrule_deactivate(ctx, rule); | |
259 | if (err < 0) { | |
260 | nft_trans_destroy(trans); | |
261 | return err; | |
262 | } | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | static int nft_delrule_by_chain(struct nft_ctx *ctx) | |
268 | { | |
269 | struct nft_rule *rule; | |
270 | int err; | |
271 | ||
272 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
273 | err = nft_delrule(ctx, rule); | |
274 | if (err < 0) | |
275 | return err; | |
276 | } | |
277 | return 0; | |
278 | } | |
279 | ||
ee01d542 AB |
280 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, |
281 | struct nft_set *set) | |
282 | { | |
283 | struct nft_trans *trans; | |
284 | ||
285 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); | |
286 | if (trans == NULL) | |
287 | return -ENOMEM; | |
288 | ||
289 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { | |
290 | nft_trans_set_id(trans) = | |
291 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); | |
37a9cc52 | 292 | nft_activate_next(ctx->net, set); |
ee01d542 AB |
293 | } |
294 | nft_trans_set(trans) = set; | |
295 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | static int nft_delset(struct nft_ctx *ctx, struct nft_set *set) | |
301 | { | |
302 | int err; | |
303 | ||
304 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); | |
305 | if (err < 0) | |
306 | return err; | |
307 | ||
37a9cc52 | 308 | nft_deactivate_next(ctx->net, set); |
ee01d542 AB |
309 | ctx->table->use--; |
310 | ||
311 | return err; | |
312 | } | |
313 | ||
e5009240 PNA |
314 | static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type, |
315 | struct nft_object *obj) | |
316 | { | |
317 | struct nft_trans *trans; | |
318 | ||
319 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj)); | |
320 | if (trans == NULL) | |
321 | return -ENOMEM; | |
322 | ||
323 | if (msg_type == NFT_MSG_NEWOBJ) | |
324 | nft_activate_next(ctx->net, obj); | |
325 | ||
326 | nft_trans_obj(trans) = obj; | |
327 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
332 | static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj) | |
333 | { | |
334 | int err; | |
335 | ||
336 | err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj); | |
337 | if (err < 0) | |
338 | return err; | |
339 | ||
340 | nft_deactivate_next(ctx->net, obj); | |
341 | ctx->table->use--; | |
342 | ||
343 | return err; | |
344 | } | |
345 | ||
96518518 PM |
346 | /* |
347 | * Tables | |
348 | */ | |
349 | ||
350 | static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, | |
f2a6d766 PNA |
351 | const struct nlattr *nla, |
352 | u8 genmask) | |
96518518 PM |
353 | { |
354 | struct nft_table *table; | |
355 | ||
356 | list_for_each_entry(table, &afi->tables, list) { | |
f2a6d766 PNA |
357 | if (!nla_strcmp(nla, table->name) && |
358 | nft_active_genmask(table, genmask)) | |
96518518 PM |
359 | return table; |
360 | } | |
361 | return NULL; | |
362 | } | |
363 | ||
364 | static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, | |
f2a6d766 PNA |
365 | const struct nlattr *nla, |
366 | u8 genmask) | |
96518518 PM |
367 | { |
368 | struct nft_table *table; | |
369 | ||
370 | if (nla == NULL) | |
371 | return ERR_PTR(-EINVAL); | |
372 | ||
f2a6d766 | 373 | table = nft_table_lookup(afi, nla, genmask); |
96518518 PM |
374 | if (table != NULL) |
375 | return table; | |
376 | ||
96518518 PM |
377 | return ERR_PTR(-ENOENT); |
378 | } | |
379 | ||
380 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) | |
381 | { | |
382 | return ++table->hgenerator; | |
383 | } | |
384 | ||
2a37d755 | 385 | static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX]; |
9370761c | 386 | |
2a37d755 | 387 | static const struct nf_chain_type * |
baae3e62 | 388 | __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
9370761c PNA |
389 | { |
390 | int i; | |
391 | ||
baae3e62 | 392 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
393 | if (chain_type[family][i] != NULL && |
394 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 395 | return chain_type[family][i]; |
9370761c | 396 | } |
baae3e62 | 397 | return NULL; |
9370761c PNA |
398 | } |
399 | ||
2a37d755 | 400 | static const struct nf_chain_type * |
baae3e62 PM |
401 | nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
402 | const struct nlattr *nla, | |
403 | bool autoload) | |
9370761c | 404 | { |
2a37d755 | 405 | const struct nf_chain_type *type; |
9370761c PNA |
406 | |
407 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
408 | if (type != NULL) |
409 | return type; | |
9370761c | 410 | #ifdef CONFIG_MODULES |
93b0806f | 411 | if (autoload) { |
9370761c | 412 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2fec6bb6 PNA |
413 | request_module("nft-chain-%u-%.*s", afi->family, |
414 | nla_len(nla), (const char *)nla_data(nla)); | |
9370761c PNA |
415 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
416 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
417 | if (type != NULL) |
418 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
419 | } |
420 | #endif | |
93b0806f | 421 | return ERR_PTR(-ENOENT); |
9370761c PNA |
422 | } |
423 | ||
96518518 | 424 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
1cae565e PNA |
425 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
426 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
9ddf6323 | 427 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
428 | }; |
429 | ||
84d7fce6 PNA |
430 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
431 | u32 portid, u32 seq, int event, u32 flags, | |
432 | int family, const struct nft_table *table) | |
96518518 PM |
433 | { |
434 | struct nlmsghdr *nlh; | |
435 | struct nfgenmsg *nfmsg; | |
436 | ||
437 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
438 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
439 | if (nlh == NULL) | |
440 | goto nla_put_failure; | |
441 | ||
442 | nfmsg = nlmsg_data(nlh); | |
443 | nfmsg->nfgen_family = family; | |
444 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 445 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 | 446 | |
9ddf6323 | 447 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 TB |
448 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
449 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) | |
96518518 PM |
450 | goto nla_put_failure; |
451 | ||
053c095a JB |
452 | nlmsg_end(skb, nlh); |
453 | return 0; | |
96518518 PM |
454 | |
455 | nla_put_failure: | |
456 | nlmsg_trim(skb, nlh); | |
457 | return -1; | |
458 | } | |
459 | ||
35151d84 | 460 | static int nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
461 | { |
462 | struct sk_buff *skb; | |
96518518 PM |
463 | int err; |
464 | ||
128ad332 PNA |
465 | if (!ctx->report && |
466 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
467 | return 0; |
468 | ||
469 | err = -ENOBUFS; | |
470 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
471 | if (skb == NULL) | |
472 | goto err; | |
473 | ||
84d7fce6 PNA |
474 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
475 | event, 0, ctx->afi->family, ctx->table); | |
96518518 PM |
476 | if (err < 0) { |
477 | kfree_skb(skb); | |
478 | goto err; | |
479 | } | |
480 | ||
128ad332 PNA |
481 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
482 | ctx->report, GFP_KERNEL); | |
96518518 | 483 | err: |
128ad332 PNA |
484 | if (err < 0) { |
485 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
486 | err); | |
487 | } | |
96518518 PM |
488 | return err; |
489 | } | |
490 | ||
491 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
492 | struct netlink_callback *cb) | |
493 | { | |
494 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
495 | const struct nft_af_info *afi; | |
496 | const struct nft_table *table; | |
497 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 498 | struct net *net = sock_net(skb->sk); |
96518518 PM |
499 | int family = nfmsg->nfgen_family; |
500 | ||
e688a7f8 | 501 | rcu_read_lock(); |
38e029f1 PNA |
502 | cb->seq = net->nft.base_seq; |
503 | ||
e688a7f8 | 504 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
505 | if (family != NFPROTO_UNSPEC && family != afi->family) |
506 | continue; | |
507 | ||
e688a7f8 | 508 | list_for_each_entry_rcu(table, &afi->tables, list) { |
96518518 PM |
509 | if (idx < s_idx) |
510 | goto cont; | |
511 | if (idx > s_idx) | |
512 | memset(&cb->args[1], 0, | |
513 | sizeof(cb->args) - sizeof(cb->args[0])); | |
f2a6d766 PNA |
514 | if (!nft_is_active(net, table)) |
515 | continue; | |
84d7fce6 | 516 | if (nf_tables_fill_table_info(skb, net, |
96518518 PM |
517 | NETLINK_CB(cb->skb).portid, |
518 | cb->nlh->nlmsg_seq, | |
519 | NFT_MSG_NEWTABLE, | |
520 | NLM_F_MULTI, | |
521 | afi->family, table) < 0) | |
522 | goto done; | |
38e029f1 PNA |
523 | |
524 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
525 | cont: |
526 | idx++; | |
527 | } | |
528 | } | |
529 | done: | |
e688a7f8 | 530 | rcu_read_unlock(); |
96518518 PM |
531 | cb->args[0] = idx; |
532 | return skb->len; | |
533 | } | |
534 | ||
7b8002a1 PNA |
535 | static int nf_tables_gettable(struct net *net, struct sock *nlsk, |
536 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
537 | const struct nlattr * const nla[]) |
538 | { | |
539 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 540 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
541 | const struct nft_af_info *afi; |
542 | const struct nft_table *table; | |
543 | struct sk_buff *skb2; | |
544 | int family = nfmsg->nfgen_family; | |
545 | int err; | |
546 | ||
547 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
548 | struct netlink_dump_control c = { | |
549 | .dump = nf_tables_dump_tables, | |
550 | }; | |
551 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
552 | } | |
553 | ||
99633ab2 | 554 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
555 | if (IS_ERR(afi)) |
556 | return PTR_ERR(afi); | |
557 | ||
f2a6d766 | 558 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
559 | if (IS_ERR(table)) |
560 | return PTR_ERR(table); | |
561 | ||
562 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
563 | if (!skb2) | |
564 | return -ENOMEM; | |
565 | ||
84d7fce6 | 566 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
567 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
568 | family, table); | |
569 | if (err < 0) | |
570 | goto err; | |
571 | ||
572 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
573 | ||
574 | err: | |
575 | kfree_skb(skb2); | |
576 | return err; | |
577 | } | |
578 | ||
664b0f8c PNA |
579 | static int nf_tables_table_enable(struct net *net, |
580 | const struct nft_af_info *afi, | |
115a60b1 | 581 | struct nft_table *table) |
9ddf6323 PNA |
582 | { |
583 | struct nft_chain *chain; | |
584 | int err, i = 0; | |
585 | ||
586 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
587 | if (!nft_is_active_next(net, chain)) |
588 | continue; | |
d2012975 PNA |
589 | if (!(chain->flags & NFT_BASE_CHAIN)) |
590 | continue; | |
591 | ||
82bec71d PNA |
592 | err = nf_register_net_hooks(net, nft_base_chain(chain)->ops, |
593 | afi->nops); | |
9ddf6323 PNA |
594 | if (err < 0) |
595 | goto err; | |
596 | ||
597 | i++; | |
598 | } | |
599 | return 0; | |
600 | err: | |
601 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
602 | if (!nft_is_active_next(net, chain)) |
603 | continue; | |
d2012975 PNA |
604 | if (!(chain->flags & NFT_BASE_CHAIN)) |
605 | continue; | |
606 | ||
9ddf6323 PNA |
607 | if (i-- <= 0) |
608 | break; | |
609 | ||
82bec71d PNA |
610 | nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, |
611 | afi->nops); | |
9ddf6323 PNA |
612 | } |
613 | return err; | |
614 | } | |
615 | ||
664b0f8c PNA |
616 | static void nf_tables_table_disable(struct net *net, |
617 | const struct nft_af_info *afi, | |
d8ee8f7c | 618 | struct nft_table *table) |
9ddf6323 PNA |
619 | { |
620 | struct nft_chain *chain; | |
621 | ||
d2012975 | 622 | list_for_each_entry(chain, &table->chains, list) { |
664b0f8c PNA |
623 | if (!nft_is_active_next(net, chain)) |
624 | continue; | |
82bec71d PNA |
625 | if (!(chain->flags & NFT_BASE_CHAIN)) |
626 | continue; | |
627 | ||
628 | nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, | |
629 | afi->nops); | |
d2012975 | 630 | } |
9ddf6323 PNA |
631 | } |
632 | ||
e1aaca93 | 633 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 634 | { |
55dd6f93 | 635 | struct nft_trans *trans; |
e1aaca93 | 636 | u32 flags; |
55dd6f93 | 637 | int ret = 0; |
9ddf6323 | 638 | |
e1aaca93 PNA |
639 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
640 | return 0; | |
9ddf6323 | 641 | |
e1aaca93 PNA |
642 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
643 | if (flags & ~NFT_TABLE_F_DORMANT) | |
644 | return -EINVAL; | |
645 | ||
63283dd2 PNA |
646 | if (flags == ctx->table->flags) |
647 | return 0; | |
648 | ||
55dd6f93 PNA |
649 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
650 | sizeof(struct nft_trans_table)); | |
651 | if (trans == NULL) | |
652 | return -ENOMEM; | |
9ddf6323 | 653 | |
e1aaca93 PNA |
654 | if ((flags & NFT_TABLE_F_DORMANT) && |
655 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 656 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
657 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
658 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
664b0f8c | 659 | ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table); |
55dd6f93 | 660 | if (ret >= 0) { |
e1aaca93 | 661 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 662 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 663 | } |
9ddf6323 | 664 | } |
e1aaca93 PNA |
665 | if (ret < 0) |
666 | goto err; | |
9ddf6323 | 667 | |
55dd6f93 PNA |
668 | nft_trans_table_update(trans) = true; |
669 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
670 | return 0; | |
9ddf6323 | 671 | err: |
55dd6f93 | 672 | nft_trans_destroy(trans); |
9ddf6323 PNA |
673 | return ret; |
674 | } | |
675 | ||
633c9a84 PNA |
676 | static int nf_tables_newtable(struct net *net, struct sock *nlsk, |
677 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
678 | const struct nlattr * const nla[]) |
679 | { | |
680 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 681 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
682 | const struct nlattr *name; |
683 | struct nft_af_info *afi; | |
684 | struct nft_table *table; | |
685 | int family = nfmsg->nfgen_family; | |
c5c1f975 | 686 | u32 flags = 0; |
e1aaca93 | 687 | struct nft_ctx ctx; |
55dd6f93 | 688 | int err; |
96518518 | 689 | |
99633ab2 | 690 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
691 | if (IS_ERR(afi)) |
692 | return PTR_ERR(afi); | |
693 | ||
694 | name = nla[NFTA_TABLE_NAME]; | |
f2a6d766 | 695 | table = nf_tables_table_lookup(afi, name, genmask); |
96518518 PM |
696 | if (IS_ERR(table)) { |
697 | if (PTR_ERR(table) != -ENOENT) | |
698 | return PTR_ERR(table); | |
699 | table = NULL; | |
700 | } | |
701 | ||
702 | if (table != NULL) { | |
703 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
704 | return -EEXIST; | |
705 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
706 | return -EOPNOTSUPP; | |
e1aaca93 | 707 | |
633c9a84 | 708 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
e1aaca93 | 709 | return nf_tables_updtable(&ctx); |
96518518 PM |
710 | } |
711 | ||
c5c1f975 PM |
712 | if (nla[NFTA_TABLE_FLAGS]) { |
713 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
714 | if (flags & ~NFT_TABLE_F_DORMANT) | |
715 | return -EINVAL; | |
716 | } | |
717 | ||
ebddf1a8 | 718 | err = -EAFNOSUPPORT; |
7047f9d0 | 719 | if (!try_module_get(afi->owner)) |
ebddf1a8 | 720 | goto err1; |
7047f9d0 | 721 | |
ffdb210e | 722 | err = -ENOMEM; |
1cae565e | 723 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
ffdb210e | 724 | if (table == NULL) |
ebddf1a8 | 725 | goto err2; |
96518518 | 726 | |
1cae565e | 727 | nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN); |
96518518 | 728 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 729 | INIT_LIST_HEAD(&table->sets); |
e5009240 | 730 | INIT_LIST_HEAD(&table->objects); |
c5c1f975 | 731 | table->flags = flags; |
9ddf6323 | 732 | |
633c9a84 | 733 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
55dd6f93 | 734 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
ffdb210e | 735 | if (err < 0) |
ebddf1a8 | 736 | goto err3; |
ffdb210e | 737 | |
e688a7f8 | 738 | list_add_tail_rcu(&table->list, &afi->tables); |
96518518 | 739 | return 0; |
ebddf1a8 | 740 | err3: |
ffdb210e | 741 | kfree(table); |
ebddf1a8 | 742 | err2: |
ffdb210e | 743 | module_put(afi->owner); |
ebddf1a8 | 744 | err1: |
ffdb210e | 745 | return err; |
96518518 PM |
746 | } |
747 | ||
b9ac12ef AB |
748 | static int nft_flush_table(struct nft_ctx *ctx) |
749 | { | |
750 | int err; | |
751 | struct nft_chain *chain, *nc; | |
e5009240 | 752 | struct nft_object *obj, *ne; |
b9ac12ef AB |
753 | struct nft_set *set, *ns; |
754 | ||
a2f18db0 | 755 | list_for_each_entry(chain, &ctx->table->chains, list) { |
664b0f8c PNA |
756 | if (!nft_is_active_next(ctx->net, chain)) |
757 | continue; | |
758 | ||
b9ac12ef AB |
759 | ctx->chain = chain; |
760 | ||
761 | err = nft_delrule_by_chain(ctx); | |
762 | if (err < 0) | |
763 | goto out; | |
b9ac12ef AB |
764 | } |
765 | ||
766 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
37a9cc52 PNA |
767 | if (!nft_is_active_next(ctx->net, set)) |
768 | continue; | |
769 | ||
b9ac12ef AB |
770 | if (set->flags & NFT_SET_ANONYMOUS && |
771 | !list_empty(&set->bindings)) | |
772 | continue; | |
773 | ||
774 | err = nft_delset(ctx, set); | |
775 | if (err < 0) | |
776 | goto out; | |
777 | } | |
778 | ||
e5009240 PNA |
779 | list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { |
780 | err = nft_delobj(ctx, obj); | |
781 | if (err < 0) | |
782 | goto out; | |
783 | } | |
784 | ||
a2f18db0 | 785 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
664b0f8c PNA |
786 | if (!nft_is_active_next(ctx->net, chain)) |
787 | continue; | |
788 | ||
a2f18db0 PNA |
789 | ctx->chain = chain; |
790 | ||
791 | err = nft_delchain(ctx); | |
792 | if (err < 0) | |
793 | goto out; | |
794 | } | |
795 | ||
b9ac12ef AB |
796 | err = nft_deltable(ctx); |
797 | out: | |
798 | return err; | |
799 | } | |
800 | ||
801 | static int nft_flush(struct nft_ctx *ctx, int family) | |
802 | { | |
803 | struct nft_af_info *afi; | |
804 | struct nft_table *table, *nt; | |
805 | const struct nlattr * const *nla = ctx->nla; | |
806 | int err = 0; | |
807 | ||
808 | list_for_each_entry(afi, &ctx->net->nft.af_info, list) { | |
809 | if (family != AF_UNSPEC && afi->family != family) | |
810 | continue; | |
811 | ||
812 | ctx->afi = afi; | |
813 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
f2a6d766 PNA |
814 | if (!nft_is_active_next(ctx->net, table)) |
815 | continue; | |
816 | ||
b9ac12ef AB |
817 | if (nla[NFTA_TABLE_NAME] && |
818 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
819 | continue; | |
820 | ||
821 | ctx->table = table; | |
822 | ||
823 | err = nft_flush_table(ctx); | |
824 | if (err < 0) | |
825 | goto out; | |
826 | } | |
827 | } | |
828 | out: | |
829 | return err; | |
830 | } | |
831 | ||
633c9a84 PNA |
832 | static int nf_tables_deltable(struct net *net, struct sock *nlsk, |
833 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
834 | const struct nlattr * const nla[]) |
835 | { | |
836 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 837 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
838 | struct nft_af_info *afi; |
839 | struct nft_table *table; | |
ee01d542 | 840 | int family = nfmsg->nfgen_family; |
55dd6f93 | 841 | struct nft_ctx ctx; |
96518518 | 842 | |
633c9a84 | 843 | nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla); |
b9ac12ef AB |
844 | if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL) |
845 | return nft_flush(&ctx, family); | |
846 | ||
99633ab2 | 847 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
848 | if (IS_ERR(afi)) |
849 | return PTR_ERR(afi); | |
850 | ||
f2a6d766 | 851 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
852 | if (IS_ERR(table)) |
853 | return PTR_ERR(table); | |
96518518 | 854 | |
b9ac12ef AB |
855 | ctx.afi = afi; |
856 | ctx.table = table; | |
55dd6f93 | 857 | |
b9ac12ef | 858 | return nft_flush_table(&ctx); |
96518518 PM |
859 | } |
860 | ||
55dd6f93 PNA |
861 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
862 | { | |
4fefee57 PNA |
863 | BUG_ON(ctx->table->use > 0); |
864 | ||
55dd6f93 PNA |
865 | kfree(ctx->table); |
866 | module_put(ctx->afi->owner); | |
867 | } | |
868 | ||
2a37d755 | 869 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 870 | { |
9370761c | 871 | int err = 0; |
96518518 PM |
872 | |
873 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
9370761c PNA |
874 | if (chain_type[ctype->family][ctype->type] != NULL) { |
875 | err = -EBUSY; | |
876 | goto out; | |
96518518 | 877 | } |
9370761c PNA |
878 | chain_type[ctype->family][ctype->type] = ctype; |
879 | out: | |
96518518 PM |
880 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
881 | return err; | |
882 | } | |
9370761c | 883 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 884 | |
2a37d755 | 885 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 886 | { |
96518518 | 887 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 888 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
889 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
890 | } | |
9370761c | 891 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
892 | |
893 | /* | |
894 | * Chains | |
895 | */ | |
896 | ||
897 | static struct nft_chain * | |
664b0f8c PNA |
898 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle, |
899 | u8 genmask) | |
96518518 PM |
900 | { |
901 | struct nft_chain *chain; | |
902 | ||
903 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
904 | if (chain->handle == handle && |
905 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
906 | return chain; |
907 | } | |
908 | ||
909 | return ERR_PTR(-ENOENT); | |
910 | } | |
911 | ||
912 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
664b0f8c PNA |
913 | const struct nlattr *nla, |
914 | u8 genmask) | |
96518518 PM |
915 | { |
916 | struct nft_chain *chain; | |
917 | ||
918 | if (nla == NULL) | |
919 | return ERR_PTR(-EINVAL); | |
920 | ||
921 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
922 | if (!nla_strcmp(nla, chain->name) && |
923 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
924 | return chain; |
925 | } | |
926 | ||
927 | return ERR_PTR(-ENOENT); | |
928 | } | |
929 | ||
930 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
b2fbd044 LZ |
931 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, |
932 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
933 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
934 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
935 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
936 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 937 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 938 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 939 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
940 | }; |
941 | ||
942 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
943 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
944 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
2cbce139 PNA |
945 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
946 | .len = IFNAMSIZ - 1 }, | |
96518518 PM |
947 | }; |
948 | ||
0ca743a5 PNA |
949 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
950 | { | |
951 | struct nft_stats *cpu_stats, total; | |
952 | struct nlattr *nest; | |
ce355e20 ED |
953 | unsigned int seq; |
954 | u64 pkts, bytes; | |
0ca743a5 PNA |
955 | int cpu; |
956 | ||
957 | memset(&total, 0, sizeof(total)); | |
958 | for_each_possible_cpu(cpu) { | |
959 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
960 | do { |
961 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
962 | pkts = cpu_stats->pkts; | |
963 | bytes = cpu_stats->bytes; | |
964 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
965 | total.pkts += pkts; | |
966 | total.bytes += bytes; | |
0ca743a5 PNA |
967 | } |
968 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
969 | if (nest == NULL) | |
970 | goto nla_put_failure; | |
971 | ||
b46f6ded ND |
972 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), |
973 | NFTA_COUNTER_PAD) || | |
974 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), | |
975 | NFTA_COUNTER_PAD)) | |
0ca743a5 PNA |
976 | goto nla_put_failure; |
977 | ||
978 | nla_nest_end(skb, nest); | |
979 | return 0; | |
980 | ||
981 | nla_put_failure: | |
982 | return -ENOSPC; | |
983 | } | |
984 | ||
84d7fce6 PNA |
985 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
986 | u32 portid, u32 seq, int event, u32 flags, | |
987 | int family, const struct nft_table *table, | |
96518518 PM |
988 | const struct nft_chain *chain) |
989 | { | |
990 | struct nlmsghdr *nlh; | |
991 | struct nfgenmsg *nfmsg; | |
992 | ||
993 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
994 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
995 | if (nlh == NULL) | |
996 | goto nla_put_failure; | |
997 | ||
998 | nfmsg = nlmsg_data(nlh); | |
999 | nfmsg->nfgen_family = family; | |
1000 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1001 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1002 | |
1003 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
1004 | goto nla_put_failure; | |
b46f6ded ND |
1005 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), |
1006 | NFTA_CHAIN_PAD)) | |
96518518 PM |
1007 | goto nla_put_failure; |
1008 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
1009 | goto nla_put_failure; | |
1010 | ||
1011 | if (chain->flags & NFT_BASE_CHAIN) { | |
0ca743a5 | 1012 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 1013 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
1014 | struct nlattr *nest; |
1015 | ||
1016 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
1017 | if (nest == NULL) |
1018 | goto nla_put_failure; | |
1019 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
1020 | goto nla_put_failure; | |
1021 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
1022 | goto nla_put_failure; | |
2cbce139 PNA |
1023 | if (basechain->dev_name[0] && |
1024 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) | |
1025 | goto nla_put_failure; | |
96518518 | 1026 | nla_nest_end(skb, nest); |
9370761c | 1027 | |
0ca743a5 PNA |
1028 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
1029 | htonl(basechain->policy))) | |
1030 | goto nla_put_failure; | |
1031 | ||
baae3e62 PM |
1032 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
1033 | goto nla_put_failure; | |
0ca743a5 PNA |
1034 | |
1035 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
1036 | goto nla_put_failure; | |
96518518 PM |
1037 | } |
1038 | ||
0ca743a5 PNA |
1039 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
1040 | goto nla_put_failure; | |
1041 | ||
053c095a JB |
1042 | nlmsg_end(skb, nlh); |
1043 | return 0; | |
96518518 PM |
1044 | |
1045 | nla_put_failure: | |
1046 | nlmsg_trim(skb, nlh); | |
1047 | return -1; | |
1048 | } | |
1049 | ||
35151d84 | 1050 | static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
1051 | { |
1052 | struct sk_buff *skb; | |
96518518 PM |
1053 | int err; |
1054 | ||
128ad332 PNA |
1055 | if (!ctx->report && |
1056 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
1057 | return 0; |
1058 | ||
1059 | err = -ENOBUFS; | |
1060 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1061 | if (skb == NULL) | |
1062 | goto err; | |
1063 | ||
84d7fce6 PNA |
1064 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
1065 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1066 | ctx->chain); |
96518518 PM |
1067 | if (err < 0) { |
1068 | kfree_skb(skb); | |
1069 | goto err; | |
1070 | } | |
1071 | ||
128ad332 PNA |
1072 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1073 | ctx->report, GFP_KERNEL); | |
96518518 | 1074 | err: |
128ad332 PNA |
1075 | if (err < 0) { |
1076 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
1077 | err); | |
1078 | } | |
96518518 PM |
1079 | return err; |
1080 | } | |
1081 | ||
1082 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1083 | struct netlink_callback *cb) | |
1084 | { | |
1085 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1086 | const struct nft_af_info *afi; | |
1087 | const struct nft_table *table; | |
1088 | const struct nft_chain *chain; | |
1089 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1090 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1091 | int family = nfmsg->nfgen_family; |
1092 | ||
e688a7f8 | 1093 | rcu_read_lock(); |
38e029f1 PNA |
1094 | cb->seq = net->nft.base_seq; |
1095 | ||
e688a7f8 | 1096 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1097 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1098 | continue; | |
1099 | ||
e688a7f8 PNA |
1100 | list_for_each_entry_rcu(table, &afi->tables, list) { |
1101 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
96518518 PM |
1102 | if (idx < s_idx) |
1103 | goto cont; | |
1104 | if (idx > s_idx) | |
1105 | memset(&cb->args[1], 0, | |
1106 | sizeof(cb->args) - sizeof(cb->args[0])); | |
664b0f8c PNA |
1107 | if (!nft_is_active(net, chain)) |
1108 | continue; | |
84d7fce6 PNA |
1109 | if (nf_tables_fill_chain_info(skb, net, |
1110 | NETLINK_CB(cb->skb).portid, | |
96518518 PM |
1111 | cb->nlh->nlmsg_seq, |
1112 | NFT_MSG_NEWCHAIN, | |
1113 | NLM_F_MULTI, | |
1114 | afi->family, table, chain) < 0) | |
1115 | goto done; | |
38e029f1 PNA |
1116 | |
1117 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
1118 | cont: |
1119 | idx++; | |
1120 | } | |
1121 | } | |
1122 | } | |
1123 | done: | |
e688a7f8 | 1124 | rcu_read_unlock(); |
96518518 PM |
1125 | cb->args[0] = idx; |
1126 | return skb->len; | |
1127 | } | |
1128 | ||
7b8002a1 PNA |
1129 | static int nf_tables_getchain(struct net *net, struct sock *nlsk, |
1130 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
1131 | const struct nlattr * const nla[]) |
1132 | { | |
1133 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1134 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
1135 | const struct nft_af_info *afi; |
1136 | const struct nft_table *table; | |
1137 | const struct nft_chain *chain; | |
1138 | struct sk_buff *skb2; | |
1139 | int family = nfmsg->nfgen_family; | |
1140 | int err; | |
1141 | ||
1142 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1143 | struct netlink_dump_control c = { | |
1144 | .dump = nf_tables_dump_chains, | |
1145 | }; | |
1146 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1147 | } | |
1148 | ||
99633ab2 | 1149 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1150 | if (IS_ERR(afi)) |
1151 | return PTR_ERR(afi); | |
1152 | ||
f2a6d766 | 1153 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1154 | if (IS_ERR(table)) |
1155 | return PTR_ERR(table); | |
1156 | ||
664b0f8c | 1157 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1158 | if (IS_ERR(chain)) |
1159 | return PTR_ERR(chain); | |
1160 | ||
1161 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1162 | if (!skb2) | |
1163 | return -ENOMEM; | |
1164 | ||
84d7fce6 | 1165 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1166 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1167 | family, table, chain); | |
1168 | if (err < 0) | |
1169 | goto err; | |
1170 | ||
1171 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1172 | ||
1173 | err: | |
1174 | kfree_skb(skb2); | |
1175 | return err; | |
1176 | } | |
1177 | ||
0ca743a5 PNA |
1178 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1179 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1180 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1181 | }; | |
1182 | ||
ff3cd7b3 | 1183 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1184 | { |
1185 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1186 | struct nft_stats __percpu *newstats; | |
1187 | struct nft_stats *stats; | |
1188 | int err; | |
1189 | ||
1190 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); | |
1191 | if (err < 0) | |
ff3cd7b3 | 1192 | return ERR_PTR(err); |
0ca743a5 PNA |
1193 | |
1194 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1195 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1196 | |
ce355e20 | 1197 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1198 | if (newstats == NULL) |
ff3cd7b3 | 1199 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1200 | |
1201 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1202 | * are not exposed to userspace. | |
1203 | */ | |
e8781f70 | 1204 | preempt_disable(); |
0ca743a5 PNA |
1205 | stats = this_cpu_ptr(newstats); |
1206 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1207 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1208 | preempt_enable(); |
0ca743a5 | 1209 | |
ff3cd7b3 PNA |
1210 | return newstats; |
1211 | } | |
1212 | ||
1213 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
1214 | struct nft_stats __percpu *newstats) | |
1215 | { | |
b88825de PNA |
1216 | if (newstats == NULL) |
1217 | return; | |
1218 | ||
0ca743a5 | 1219 | if (chain->stats) { |
0ca743a5 | 1220 | struct nft_stats __percpu *oldstats = |
67a8fc27 | 1221 | nft_dereference(chain->stats); |
0ca743a5 PNA |
1222 | |
1223 | rcu_assign_pointer(chain->stats, newstats); | |
1224 | synchronize_rcu(); | |
1225 | free_percpu(oldstats); | |
1226 | } else | |
1227 | rcu_assign_pointer(chain->stats, newstats); | |
0ca743a5 PNA |
1228 | } |
1229 | ||
91c7b38d PNA |
1230 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
1231 | { | |
1232 | BUG_ON(chain->use > 0); | |
1233 | ||
1234 | if (chain->flags & NFT_BASE_CHAIN) { | |
2cbce139 PNA |
1235 | struct nft_base_chain *basechain = nft_base_chain(chain); |
1236 | ||
1237 | module_put(basechain->type->owner); | |
1238 | free_percpu(basechain->stats); | |
1239 | if (basechain->ops[0].dev != NULL) | |
1240 | dev_put(basechain->ops[0].dev); | |
1241 | kfree(basechain); | |
91c7b38d PNA |
1242 | } else { |
1243 | kfree(chain); | |
1244 | } | |
1245 | } | |
1246 | ||
508f8ccd PNA |
1247 | struct nft_chain_hook { |
1248 | u32 num; | |
1249 | u32 priority; | |
1250 | const struct nf_chain_type *type; | |
1251 | struct net_device *dev; | |
1252 | }; | |
1253 | ||
1254 | static int nft_chain_parse_hook(struct net *net, | |
1255 | const struct nlattr * const nla[], | |
1256 | struct nft_af_info *afi, | |
1257 | struct nft_chain_hook *hook, bool create) | |
1258 | { | |
1259 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; | |
1260 | const struct nf_chain_type *type; | |
1261 | struct net_device *dev; | |
1262 | int err; | |
1263 | ||
1264 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
1265 | nft_hook_policy); | |
1266 | if (err < 0) | |
1267 | return err; | |
1268 | ||
1269 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1270 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1271 | return -EINVAL; | |
1272 | ||
1273 | hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
1274 | if (hook->num >= afi->nhooks) | |
1275 | return -EINVAL; | |
1276 | ||
1277 | hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); | |
1278 | ||
1279 | type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT]; | |
1280 | if (nla[NFTA_CHAIN_TYPE]) { | |
1281 | type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE], | |
1282 | create); | |
1283 | if (IS_ERR(type)) | |
1284 | return PTR_ERR(type); | |
1285 | } | |
1286 | if (!(type->hook_mask & (1 << hook->num))) | |
1287 | return -EOPNOTSUPP; | |
1288 | if (!try_module_get(type->owner)) | |
1289 | return -ENOENT; | |
1290 | ||
1291 | hook->type = type; | |
1292 | ||
1293 | hook->dev = NULL; | |
1294 | if (afi->flags & NFT_AF_NEEDS_DEV) { | |
1295 | char ifname[IFNAMSIZ]; | |
1296 | ||
1297 | if (!ha[NFTA_HOOK_DEV]) { | |
1298 | module_put(type->owner); | |
1299 | return -EOPNOTSUPP; | |
1300 | } | |
1301 | ||
1302 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); | |
1303 | dev = dev_get_by_name(net, ifname); | |
1304 | if (!dev) { | |
1305 | module_put(type->owner); | |
1306 | return -ENOENT; | |
1307 | } | |
1308 | hook->dev = dev; | |
1309 | } else if (ha[NFTA_HOOK_DEV]) { | |
1310 | module_put(type->owner); | |
1311 | return -EOPNOTSUPP; | |
1312 | } | |
1313 | ||
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | static void nft_chain_release_hook(struct nft_chain_hook *hook) | |
1318 | { | |
1319 | module_put(hook->type->owner); | |
1320 | if (hook->dev != NULL) | |
1321 | dev_put(hook->dev); | |
1322 | } | |
1323 | ||
633c9a84 PNA |
1324 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
1325 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
1326 | const struct nlattr * const nla[]) |
1327 | { | |
1328 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1329 | const struct nlattr * uninitialized_var(name); | |
7c95f6d8 | 1330 | struct nft_af_info *afi; |
96518518 PM |
1331 | struct nft_table *table; |
1332 | struct nft_chain *chain; | |
0ca743a5 | 1333 | struct nft_base_chain *basechain = NULL; |
f2a6d766 | 1334 | u8 genmask = nft_genmask_next(net); |
96518518 | 1335 | int family = nfmsg->nfgen_family; |
57de2a0c | 1336 | u8 policy = NF_ACCEPT; |
96518518 | 1337 | u64 handle = 0; |
115a60b1 | 1338 | unsigned int i; |
ff3cd7b3 | 1339 | struct nft_stats __percpu *stats; |
96518518 PM |
1340 | int err; |
1341 | bool create; | |
91c7b38d | 1342 | struct nft_ctx ctx; |
96518518 PM |
1343 | |
1344 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1345 | ||
99633ab2 | 1346 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
1347 | if (IS_ERR(afi)) |
1348 | return PTR_ERR(afi); | |
1349 | ||
f2a6d766 | 1350 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1351 | if (IS_ERR(table)) |
1352 | return PTR_ERR(table); | |
1353 | ||
96518518 PM |
1354 | chain = NULL; |
1355 | name = nla[NFTA_CHAIN_NAME]; | |
1356 | ||
1357 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1358 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
664b0f8c | 1359 | chain = nf_tables_chain_lookup_byhandle(table, handle, genmask); |
96518518 PM |
1360 | if (IS_ERR(chain)) |
1361 | return PTR_ERR(chain); | |
1362 | } else { | |
664b0f8c | 1363 | chain = nf_tables_chain_lookup(table, name, genmask); |
96518518 PM |
1364 | if (IS_ERR(chain)) { |
1365 | if (PTR_ERR(chain) != -ENOENT) | |
1366 | return PTR_ERR(chain); | |
1367 | chain = NULL; | |
1368 | } | |
1369 | } | |
1370 | ||
57de2a0c PM |
1371 | if (nla[NFTA_CHAIN_POLICY]) { |
1372 | if ((chain != NULL && | |
d6b6cb1d PNA |
1373 | !(chain->flags & NFT_BASE_CHAIN))) |
1374 | return -EOPNOTSUPP; | |
1375 | ||
1376 | if (chain == NULL && | |
57de2a0c PM |
1377 | nla[NFTA_CHAIN_HOOK] == NULL) |
1378 | return -EOPNOTSUPP; | |
1379 | ||
8f46df18 | 1380 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1381 | switch (policy) { |
1382 | case NF_DROP: | |
1383 | case NF_ACCEPT: | |
1384 | break; | |
1385 | default: | |
1386 | return -EINVAL; | |
1387 | } | |
1388 | } | |
1389 | ||
96518518 | 1390 | if (chain != NULL) { |
91c7b38d PNA |
1391 | struct nft_stats *stats = NULL; |
1392 | struct nft_trans *trans; | |
1393 | ||
96518518 PM |
1394 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
1395 | return -EEXIST; | |
1396 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1397 | return -EOPNOTSUPP; | |
1398 | ||
6133740d PNA |
1399 | if (nla[NFTA_CHAIN_HOOK]) { |
1400 | struct nft_base_chain *basechain; | |
1401 | struct nft_chain_hook hook; | |
1402 | struct nf_hook_ops *ops; | |
1403 | ||
1404 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
1405 | return -EBUSY; | |
1406 | ||
1407 | err = nft_chain_parse_hook(net, nla, afi, &hook, | |
1408 | create); | |
1409 | if (err < 0) | |
1410 | return err; | |
1411 | ||
1412 | basechain = nft_base_chain(chain); | |
1413 | if (basechain->type != hook.type) { | |
1414 | nft_chain_release_hook(&hook); | |
1415 | return -EBUSY; | |
1416 | } | |
1417 | ||
1418 | for (i = 0; i < afi->nops; i++) { | |
1419 | ops = &basechain->ops[i]; | |
1420 | if (ops->hooknum != hook.num || | |
1421 | ops->priority != hook.priority || | |
1422 | ops->dev != hook.dev) { | |
1423 | nft_chain_release_hook(&hook); | |
1424 | return -EBUSY; | |
1425 | } | |
1426 | } | |
1427 | nft_chain_release_hook(&hook); | |
1428 | } | |
1429 | ||
664b0f8c PNA |
1430 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
1431 | struct nft_chain *chain2; | |
1432 | ||
1433 | chain2 = nf_tables_chain_lookup(table, | |
1434 | nla[NFTA_CHAIN_NAME], | |
1435 | genmask); | |
1436 | if (IS_ERR(chain2)) | |
1437 | return PTR_ERR(chain2); | |
1438 | } | |
96518518 | 1439 | |
0ca743a5 PNA |
1440 | if (nla[NFTA_CHAIN_COUNTERS]) { |
1441 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
1442 | return -EOPNOTSUPP; | |
1443 | ||
ff3cd7b3 PNA |
1444 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1445 | if (IS_ERR(stats)) | |
1446 | return PTR_ERR(stats); | |
0ca743a5 PNA |
1447 | } |
1448 | ||
633c9a84 | 1449 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
91c7b38d PNA |
1450 | trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN, |
1451 | sizeof(struct nft_trans_chain)); | |
f5553c19 PNA |
1452 | if (trans == NULL) { |
1453 | free_percpu(stats); | |
91c7b38d | 1454 | return -ENOMEM; |
f5553c19 | 1455 | } |
4401a862 | 1456 | |
91c7b38d PNA |
1457 | nft_trans_chain_stats(trans) = stats; |
1458 | nft_trans_chain_update(trans) = true; | |
4401a862 | 1459 | |
91c7b38d PNA |
1460 | if (nla[NFTA_CHAIN_POLICY]) |
1461 | nft_trans_chain_policy(trans) = policy; | |
1462 | else | |
1463 | nft_trans_chain_policy(trans) = -1; | |
96518518 | 1464 | |
91c7b38d PNA |
1465 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
1466 | nla_strlcpy(nft_trans_chain_name(trans), name, | |
1467 | NFT_CHAIN_MAXNAMELEN); | |
1468 | } | |
1469 | list_add_tail(&trans->list, &net->nft.commit_list); | |
1470 | return 0; | |
96518518 PM |
1471 | } |
1472 | ||
75820676 PM |
1473 | if (table->use == UINT_MAX) |
1474 | return -EOVERFLOW; | |
1475 | ||
96518518 | 1476 | if (nla[NFTA_CHAIN_HOOK]) { |
508f8ccd | 1477 | struct nft_chain_hook hook; |
96518518 | 1478 | struct nf_hook_ops *ops; |
9370761c | 1479 | nf_hookfn *hookfn; |
96518518 | 1480 | |
508f8ccd | 1481 | err = nft_chain_parse_hook(net, nla, afi, &hook, create); |
96518518 PM |
1482 | if (err < 0) |
1483 | return err; | |
2cbce139 | 1484 | |
96518518 | 1485 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
f5553c19 | 1486 | if (basechain == NULL) { |
508f8ccd | 1487 | nft_chain_release_hook(&hook); |
96518518 | 1488 | return -ENOMEM; |
f5553c19 | 1489 | } |
9370761c | 1490 | |
508f8ccd PNA |
1491 | if (hook.dev != NULL) |
1492 | strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ); | |
2cbce139 | 1493 | |
4401a862 | 1494 | if (nla[NFTA_CHAIN_COUNTERS]) { |
ff3cd7b3 PNA |
1495 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1496 | if (IS_ERR(stats)) { | |
508f8ccd | 1497 | nft_chain_release_hook(&hook); |
4401a862 | 1498 | kfree(basechain); |
ff3cd7b3 | 1499 | return PTR_ERR(stats); |
4401a862 | 1500 | } |
ff3cd7b3 | 1501 | basechain->stats = stats; |
4401a862 | 1502 | } else { |
ce355e20 | 1503 | stats = netdev_alloc_pcpu_stats(struct nft_stats); |
c123bb71 | 1504 | if (stats == NULL) { |
508f8ccd | 1505 | nft_chain_release_hook(&hook); |
4401a862 | 1506 | kfree(basechain); |
c123bb71 | 1507 | return -ENOMEM; |
4401a862 | 1508 | } |
ff3cd7b3 | 1509 | rcu_assign_pointer(basechain->stats, stats); |
4401a862 PM |
1510 | } |
1511 | ||
508f8ccd PNA |
1512 | hookfn = hook.type->hooks[hook.num]; |
1513 | basechain->type = hook.type; | |
96518518 PM |
1514 | chain = &basechain->chain; |
1515 | ||
115a60b1 PM |
1516 | for (i = 0; i < afi->nops; i++) { |
1517 | ops = &basechain->ops[i]; | |
1518 | ops->pf = family; | |
508f8ccd PNA |
1519 | ops->hooknum = hook.num; |
1520 | ops->priority = hook.priority; | |
115a60b1 PM |
1521 | ops->priv = chain; |
1522 | ops->hook = afi->hooks[ops->hooknum]; | |
508f8ccd | 1523 | ops->dev = hook.dev; |
115a60b1 PM |
1524 | if (hookfn) |
1525 | ops->hook = hookfn; | |
1526 | if (afi->hook_ops_init) | |
1527 | afi->hook_ops_init(ops, i); | |
1528 | } | |
96518518 PM |
1529 | |
1530 | chain->flags |= NFT_BASE_CHAIN; | |
57de2a0c | 1531 | basechain->policy = policy; |
96518518 PM |
1532 | } else { |
1533 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1534 | if (chain == NULL) | |
1535 | return -ENOMEM; | |
1536 | } | |
1537 | ||
1538 | INIT_LIST_HEAD(&chain->rules); | |
1539 | chain->handle = nf_tables_alloc_handle(table); | |
b5bc89bf | 1540 | chain->table = table; |
96518518 PM |
1541 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
1542 | ||
82bec71d | 1543 | err = nf_tables_register_hooks(net, table, chain, afi->nops); |
d8ee8f7c PNA |
1544 | if (err < 0) |
1545 | goto err1; | |
96518518 | 1546 | |
633c9a84 | 1547 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
91c7b38d PNA |
1548 | err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN); |
1549 | if (err < 0) | |
1550 | goto err2; | |
96518518 | 1551 | |
4fefee57 | 1552 | table->use++; |
e688a7f8 | 1553 | list_add_tail_rcu(&chain->list, &table->chains); |
91c7b38d PNA |
1554 | return 0; |
1555 | err2: | |
82bec71d | 1556 | nf_tables_unregister_hooks(net, table, chain, afi->nops); |
91c7b38d PNA |
1557 | err1: |
1558 | nf_tables_chain_destroy(chain); | |
1559 | return err; | |
96518518 PM |
1560 | } |
1561 | ||
633c9a84 PNA |
1562 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
1563 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
1564 | const struct nlattr * const nla[]) |
1565 | { | |
1566 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1567 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 1568 | struct nft_af_info *afi; |
96518518 PM |
1569 | struct nft_table *table; |
1570 | struct nft_chain *chain; | |
1571 | int family = nfmsg->nfgen_family; | |
91c7b38d | 1572 | struct nft_ctx ctx; |
96518518 | 1573 | |
99633ab2 | 1574 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1575 | if (IS_ERR(afi)) |
1576 | return PTR_ERR(afi); | |
1577 | ||
f2a6d766 | 1578 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1579 | if (IS_ERR(table)) |
1580 | return PTR_ERR(table); | |
1581 | ||
664b0f8c | 1582 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1583 | if (IS_ERR(chain)) |
1584 | return PTR_ERR(chain); | |
4fefee57 | 1585 | if (chain->use > 0) |
96518518 PM |
1586 | return -EBUSY; |
1587 | ||
633c9a84 | 1588 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0165d932 | 1589 | |
ee01d542 | 1590 | return nft_delchain(&ctx); |
96518518 PM |
1591 | } |
1592 | ||
96518518 PM |
1593 | /* |
1594 | * Expressions | |
1595 | */ | |
1596 | ||
1597 | /** | |
ef1f7df9 PM |
1598 | * nft_register_expr - register nf_tables expr type |
1599 | * @ops: expr type | |
96518518 | 1600 | * |
ef1f7df9 | 1601 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1602 | * success or a negative errno code otherwise. |
1603 | */ | |
ef1f7df9 | 1604 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1605 | { |
1606 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1607 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1608 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1609 | else |
e688a7f8 | 1610 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1611 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1612 | return 0; | |
1613 | } | |
1614 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1615 | ||
1616 | /** | |
ef1f7df9 PM |
1617 | * nft_unregister_expr - unregister nf_tables expr type |
1618 | * @ops: expr type | |
96518518 | 1619 | * |
ef1f7df9 | 1620 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1621 | */ |
ef1f7df9 | 1622 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1623 | { |
1624 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1625 | list_del_rcu(&type->list); |
96518518 PM |
1626 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1627 | } | |
1628 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1629 | ||
64d46806 PM |
1630 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1631 | struct nlattr *nla) | |
96518518 | 1632 | { |
ef1f7df9 | 1633 | const struct nft_expr_type *type; |
96518518 | 1634 | |
ef1f7df9 | 1635 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1636 | if (!nla_strcmp(nla, type->name) && |
1637 | (!type->family || type->family == family)) | |
ef1f7df9 | 1638 | return type; |
96518518 PM |
1639 | } |
1640 | return NULL; | |
1641 | } | |
1642 | ||
64d46806 PM |
1643 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1644 | struct nlattr *nla) | |
96518518 | 1645 | { |
ef1f7df9 | 1646 | const struct nft_expr_type *type; |
96518518 PM |
1647 | |
1648 | if (nla == NULL) | |
1649 | return ERR_PTR(-EINVAL); | |
1650 | ||
64d46806 | 1651 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1652 | if (type != NULL && try_module_get(type->owner)) |
1653 | return type; | |
96518518 PM |
1654 | |
1655 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1656 | if (type == NULL) { |
64d46806 PM |
1657 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1658 | request_module("nft-expr-%u-%.*s", family, | |
1659 | nla_len(nla), (char *)nla_data(nla)); | |
1660 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1661 | if (__nft_expr_type_get(family, nla)) | |
1662 | return ERR_PTR(-EAGAIN); | |
1663 | ||
96518518 PM |
1664 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1665 | request_module("nft-expr-%.*s", | |
1666 | nla_len(nla), (char *)nla_data(nla)); | |
1667 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1668 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1669 | return ERR_PTR(-EAGAIN); |
1670 | } | |
1671 | #endif | |
1672 | return ERR_PTR(-ENOENT); | |
1673 | } | |
1674 | ||
1675 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1676 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1677 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1678 | }; | |
1679 | ||
1680 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1681 | const struct nft_expr *expr) | |
1682 | { | |
ef1f7df9 | 1683 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1684 | goto nla_put_failure; |
1685 | ||
1686 | if (expr->ops->dump) { | |
1687 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1688 | if (data == NULL) | |
1689 | goto nla_put_failure; | |
1690 | if (expr->ops->dump(skb, expr) < 0) | |
1691 | goto nla_put_failure; | |
1692 | nla_nest_end(skb, data); | |
1693 | } | |
1694 | ||
1695 | return skb->len; | |
1696 | ||
1697 | nla_put_failure: | |
1698 | return -1; | |
1699 | }; | |
1700 | ||
0b2d8a7b PM |
1701 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
1702 | const struct nft_expr *expr) | |
1703 | { | |
1704 | struct nlattr *nest; | |
1705 | ||
1706 | nest = nla_nest_start(skb, attr); | |
1707 | if (!nest) | |
1708 | goto nla_put_failure; | |
1709 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1710 | goto nla_put_failure; | |
1711 | nla_nest_end(skb, nest); | |
1712 | return 0; | |
1713 | ||
1714 | nla_put_failure: | |
1715 | return -1; | |
1716 | } | |
1717 | ||
96518518 PM |
1718 | struct nft_expr_info { |
1719 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1720 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1721 | }; |
1722 | ||
0ca743a5 PNA |
1723 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1724 | const struct nlattr *nla, | |
96518518 PM |
1725 | struct nft_expr_info *info) |
1726 | { | |
ef1f7df9 | 1727 | const struct nft_expr_type *type; |
96518518 | 1728 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1729 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1730 | int err; |
1731 | ||
ef1f7df9 | 1732 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
96518518 PM |
1733 | if (err < 0) |
1734 | return err; | |
1735 | ||
64d46806 | 1736 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1737 | if (IS_ERR(type)) |
1738 | return PTR_ERR(type); | |
1739 | ||
1740 | if (tb[NFTA_EXPR_DATA]) { | |
1741 | err = nla_parse_nested(info->tb, type->maxattr, | |
1742 | tb[NFTA_EXPR_DATA], type->policy); | |
1743 | if (err < 0) | |
1744 | goto err1; | |
1745 | } else | |
1746 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1747 | ||
1748 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1749 | ops = type->select_ops(ctx, |
1750 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1751 | if (IS_ERR(ops)) { |
1752 | err = PTR_ERR(ops); | |
1753 | goto err1; | |
1754 | } | |
1755 | } else | |
1756 | ops = type->ops; | |
1757 | ||
96518518 PM |
1758 | info->ops = ops; |
1759 | return 0; | |
ef1f7df9 PM |
1760 | |
1761 | err1: | |
1762 | module_put(type->owner); | |
1763 | return err; | |
96518518 PM |
1764 | } |
1765 | ||
1766 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1767 | const struct nft_expr_info *info, |
96518518 PM |
1768 | struct nft_expr *expr) |
1769 | { | |
1770 | const struct nft_expr_ops *ops = info->ops; | |
1771 | int err; | |
1772 | ||
1773 | expr->ops = ops; | |
1774 | if (ops->init) { | |
ef1f7df9 | 1775 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1776 | if (err < 0) |
1777 | goto err1; | |
1778 | } | |
1779 | ||
96518518 PM |
1780 | return 0; |
1781 | ||
1782 | err1: | |
1783 | expr->ops = NULL; | |
1784 | return err; | |
1785 | } | |
1786 | ||
62472bce PM |
1787 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1788 | struct nft_expr *expr) | |
96518518 PM |
1789 | { |
1790 | if (expr->ops->destroy) | |
62472bce | 1791 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1792 | module_put(expr->ops->type->owner); |
96518518 PM |
1793 | } |
1794 | ||
0b2d8a7b PM |
1795 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
1796 | const struct nlattr *nla) | |
1797 | { | |
1798 | struct nft_expr_info info; | |
1799 | struct nft_expr *expr; | |
1800 | int err; | |
1801 | ||
1802 | err = nf_tables_expr_parse(ctx, nla, &info); | |
1803 | if (err < 0) | |
1804 | goto err1; | |
1805 | ||
1806 | err = -ENOMEM; | |
1807 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
1808 | if (expr == NULL) | |
1809 | goto err2; | |
1810 | ||
1811 | err = nf_tables_newexpr(ctx, &info, expr); | |
1812 | if (err < 0) | |
6cafaf47 | 1813 | goto err3; |
0b2d8a7b PM |
1814 | |
1815 | return expr; | |
6cafaf47 LZ |
1816 | err3: |
1817 | kfree(expr); | |
0b2d8a7b PM |
1818 | err2: |
1819 | module_put(info.ops->type->owner); | |
1820 | err1: | |
1821 | return ERR_PTR(err); | |
1822 | } | |
1823 | ||
1824 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
1825 | { | |
1826 | nf_tables_expr_destroy(ctx, expr); | |
1827 | kfree(expr); | |
1828 | } | |
1829 | ||
96518518 PM |
1830 | /* |
1831 | * Rules | |
1832 | */ | |
1833 | ||
1834 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1835 | u64 handle) | |
1836 | { | |
1837 | struct nft_rule *rule; | |
1838 | ||
1839 | // FIXME: this sucks | |
1840 | list_for_each_entry(rule, &chain->rules, list) { | |
1841 | if (handle == rule->handle) | |
1842 | return rule; | |
1843 | } | |
1844 | ||
1845 | return ERR_PTR(-ENOENT); | |
1846 | } | |
1847 | ||
1848 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1849 | const struct nlattr *nla) | |
1850 | { | |
1851 | if (nla == NULL) | |
1852 | return ERR_PTR(-EINVAL); | |
1853 | ||
1854 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1855 | } | |
1856 | ||
1857 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
b2fbd044 LZ |
1858 | [NFTA_RULE_TABLE] = { .type = NLA_STRING, |
1859 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
1860 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
1861 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1862 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1863 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1864 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1865 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1866 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1867 | .len = NFT_USERDATA_MAXLEN }, | |
96518518 PM |
1868 | }; |
1869 | ||
84d7fce6 PNA |
1870 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
1871 | u32 portid, u32 seq, int event, | |
1872 | u32 flags, int family, | |
96518518 PM |
1873 | const struct nft_table *table, |
1874 | const struct nft_chain *chain, | |
1875 | const struct nft_rule *rule) | |
1876 | { | |
1877 | struct nlmsghdr *nlh; | |
1878 | struct nfgenmsg *nfmsg; | |
1879 | const struct nft_expr *expr, *next; | |
1880 | struct nlattr *list; | |
5e948466 EL |
1881 | const struct nft_rule *prule; |
1882 | int type = event | NFNL_SUBSYS_NFTABLES << 8; | |
96518518 | 1883 | |
5e948466 | 1884 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
96518518 PM |
1885 | flags); |
1886 | if (nlh == NULL) | |
1887 | goto nla_put_failure; | |
1888 | ||
1889 | nfmsg = nlmsg_data(nlh); | |
1890 | nfmsg->nfgen_family = family; | |
1891 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1892 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1893 | |
1894 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1895 | goto nla_put_failure; | |
1896 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1897 | goto nla_put_failure; | |
b46f6ded ND |
1898 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), |
1899 | NFTA_RULE_PAD)) | |
96518518 PM |
1900 | goto nla_put_failure; |
1901 | ||
5e948466 EL |
1902 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
1903 | prule = list_entry(rule->list.prev, struct nft_rule, list); | |
1904 | if (nla_put_be64(skb, NFTA_RULE_POSITION, | |
b46f6ded ND |
1905 | cpu_to_be64(prule->handle), |
1906 | NFTA_RULE_PAD)) | |
5e948466 EL |
1907 | goto nla_put_failure; |
1908 | } | |
1909 | ||
96518518 PM |
1910 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
1911 | if (list == NULL) | |
1912 | goto nla_put_failure; | |
1913 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 1914 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 1915 | goto nla_put_failure; |
96518518 PM |
1916 | } |
1917 | nla_nest_end(skb, list); | |
1918 | ||
86f1ec32 PM |
1919 | if (rule->udata) { |
1920 | struct nft_userdata *udata = nft_userdata(rule); | |
1921 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
1922 | udata->data) < 0) | |
1923 | goto nla_put_failure; | |
1924 | } | |
0768b3b3 | 1925 | |
053c095a JB |
1926 | nlmsg_end(skb, nlh); |
1927 | return 0; | |
96518518 PM |
1928 | |
1929 | nla_put_failure: | |
1930 | nlmsg_trim(skb, nlh); | |
1931 | return -1; | |
1932 | } | |
1933 | ||
35151d84 | 1934 | static int nf_tables_rule_notify(const struct nft_ctx *ctx, |
96518518 | 1935 | const struct nft_rule *rule, |
35151d84 | 1936 | int event) |
96518518 PM |
1937 | { |
1938 | struct sk_buff *skb; | |
96518518 PM |
1939 | int err; |
1940 | ||
128ad332 PNA |
1941 | if (!ctx->report && |
1942 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
1943 | return 0; |
1944 | ||
1945 | err = -ENOBUFS; | |
1946 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1947 | if (skb == NULL) | |
1948 | goto err; | |
1949 | ||
84d7fce6 PNA |
1950 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
1951 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1952 | ctx->chain, rule); |
96518518 PM |
1953 | if (err < 0) { |
1954 | kfree_skb(skb); | |
1955 | goto err; | |
1956 | } | |
1957 | ||
128ad332 PNA |
1958 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1959 | ctx->report, GFP_KERNEL); | |
96518518 | 1960 | err: |
128ad332 PNA |
1961 | if (err < 0) { |
1962 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
1963 | err); | |
1964 | } | |
96518518 PM |
1965 | return err; |
1966 | } | |
1967 | ||
6e1f760e PNA |
1968 | struct nft_rule_dump_ctx { |
1969 | char table[NFT_TABLE_MAXNAMELEN]; | |
1970 | char chain[NFT_CHAIN_MAXNAMELEN]; | |
1971 | }; | |
1972 | ||
96518518 PM |
1973 | static int nf_tables_dump_rules(struct sk_buff *skb, |
1974 | struct netlink_callback *cb) | |
1975 | { | |
1976 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
6e1f760e | 1977 | const struct nft_rule_dump_ctx *ctx = cb->data; |
96518518 PM |
1978 | const struct nft_af_info *afi; |
1979 | const struct nft_table *table; | |
1980 | const struct nft_chain *chain; | |
1981 | const struct nft_rule *rule; | |
1982 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1983 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1984 | int family = nfmsg->nfgen_family; |
1985 | ||
e688a7f8 | 1986 | rcu_read_lock(); |
38e029f1 PNA |
1987 | cb->seq = net->nft.base_seq; |
1988 | ||
e688a7f8 | 1989 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1990 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1991 | continue; | |
1992 | ||
e688a7f8 | 1993 | list_for_each_entry_rcu(table, &afi->tables, list) { |
6e1f760e PNA |
1994 | if (ctx && ctx->table[0] && |
1995 | strcmp(ctx->table, table->name) != 0) | |
1996 | continue; | |
1997 | ||
e688a7f8 | 1998 | list_for_each_entry_rcu(chain, &table->chains, list) { |
6e1f760e PNA |
1999 | if (ctx && ctx->chain[0] && |
2000 | strcmp(ctx->chain, chain->name) != 0) | |
2001 | continue; | |
2002 | ||
e688a7f8 | 2003 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
889f7ee7 | 2004 | if (!nft_is_active(net, rule)) |
0628b123 | 2005 | goto cont; |
96518518 PM |
2006 | if (idx < s_idx) |
2007 | goto cont; | |
2008 | if (idx > s_idx) | |
2009 | memset(&cb->args[1], 0, | |
2010 | sizeof(cb->args) - sizeof(cb->args[0])); | |
84d7fce6 | 2011 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, |
96518518 PM |
2012 | cb->nlh->nlmsg_seq, |
2013 | NFT_MSG_NEWRULE, | |
2014 | NLM_F_MULTI | NLM_F_APPEND, | |
2015 | afi->family, table, chain, rule) < 0) | |
2016 | goto done; | |
38e029f1 PNA |
2017 | |
2018 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
2019 | cont: |
2020 | idx++; | |
2021 | } | |
2022 | } | |
2023 | } | |
2024 | } | |
2025 | done: | |
e688a7f8 PNA |
2026 | rcu_read_unlock(); |
2027 | ||
96518518 PM |
2028 | cb->args[0] = idx; |
2029 | return skb->len; | |
2030 | } | |
2031 | ||
6e1f760e PNA |
2032 | static int nf_tables_dump_rules_done(struct netlink_callback *cb) |
2033 | { | |
2034 | kfree(cb->data); | |
2035 | return 0; | |
2036 | } | |
2037 | ||
7b8002a1 PNA |
2038 | static int nf_tables_getrule(struct net *net, struct sock *nlsk, |
2039 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
2040 | const struct nlattr * const nla[]) |
2041 | { | |
2042 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2043 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
2044 | const struct nft_af_info *afi; |
2045 | const struct nft_table *table; | |
2046 | const struct nft_chain *chain; | |
2047 | const struct nft_rule *rule; | |
2048 | struct sk_buff *skb2; | |
2049 | int family = nfmsg->nfgen_family; | |
2050 | int err; | |
2051 | ||
2052 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2053 | struct netlink_dump_control c = { | |
2054 | .dump = nf_tables_dump_rules, | |
6e1f760e | 2055 | .done = nf_tables_dump_rules_done, |
96518518 | 2056 | }; |
6e1f760e PNA |
2057 | |
2058 | if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { | |
2059 | struct nft_rule_dump_ctx *ctx; | |
2060 | ||
2061 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
2062 | if (!ctx) | |
2063 | return -ENOMEM; | |
2064 | ||
2065 | if (nla[NFTA_RULE_TABLE]) | |
2066 | nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE], | |
2067 | sizeof(ctx->table)); | |
2068 | if (nla[NFTA_RULE_CHAIN]) | |
2069 | nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN], | |
2070 | sizeof(ctx->chain)); | |
2071 | c.data = ctx; | |
2072 | } | |
2073 | ||
96518518 PM |
2074 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2075 | } | |
2076 | ||
99633ab2 | 2077 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2078 | if (IS_ERR(afi)) |
2079 | return PTR_ERR(afi); | |
2080 | ||
f2a6d766 | 2081 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2082 | if (IS_ERR(table)) |
2083 | return PTR_ERR(table); | |
2084 | ||
664b0f8c | 2085 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2086 | if (IS_ERR(chain)) |
2087 | return PTR_ERR(chain); | |
2088 | ||
2089 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
2090 | if (IS_ERR(rule)) | |
2091 | return PTR_ERR(rule); | |
2092 | ||
2093 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2094 | if (!skb2) | |
2095 | return -ENOMEM; | |
2096 | ||
84d7fce6 | 2097 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
2098 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
2099 | family, table, chain, rule); | |
2100 | if (err < 0) | |
2101 | goto err; | |
2102 | ||
2103 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2104 | ||
2105 | err: | |
2106 | kfree_skb(skb2); | |
2107 | return err; | |
2108 | } | |
2109 | ||
62472bce PM |
2110 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
2111 | struct nft_rule *rule) | |
96518518 | 2112 | { |
96518518 PM |
2113 | struct nft_expr *expr; |
2114 | ||
2115 | /* | |
2116 | * Careful: some expressions might not be initialized in case this | |
2117 | * is called on error from nf_tables_newrule(). | |
2118 | */ | |
2119 | expr = nft_expr_first(rule); | |
3e38df13 | 2120 | while (expr != nft_expr_last(rule) && expr->ops) { |
62472bce | 2121 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
2122 | expr = nft_expr_next(expr); |
2123 | } | |
2124 | kfree(rule); | |
2125 | } | |
2126 | ||
1081d11b PNA |
2127 | #define NFT_RULE_MAXEXPRS 128 |
2128 | ||
2129 | static struct nft_expr_info *info; | |
2130 | ||
633c9a84 PNA |
2131 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
2132 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
2133 | const struct nlattr * const nla[]) |
2134 | { | |
2135 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2136 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2137 | struct nft_af_info *afi; |
96518518 PM |
2138 | struct nft_table *table; |
2139 | struct nft_chain *chain; | |
2140 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 2141 | struct nft_userdata *udata; |
1081d11b | 2142 | struct nft_trans *trans = NULL; |
96518518 PM |
2143 | struct nft_expr *expr; |
2144 | struct nft_ctx ctx; | |
2145 | struct nlattr *tmp; | |
86f1ec32 | 2146 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 PM |
2147 | int err, rem; |
2148 | bool create; | |
5e948466 | 2149 | u64 handle, pos_handle; |
96518518 PM |
2150 | |
2151 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
2152 | ||
99633ab2 | 2153 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
2154 | if (IS_ERR(afi)) |
2155 | return PTR_ERR(afi); | |
2156 | ||
f2a6d766 | 2157 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2158 | if (IS_ERR(table)) |
2159 | return PTR_ERR(table); | |
2160 | ||
664b0f8c | 2161 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2162 | if (IS_ERR(chain)) |
2163 | return PTR_ERR(chain); | |
2164 | ||
2165 | if (nla[NFTA_RULE_HANDLE]) { | |
2166 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
2167 | rule = __nf_tables_rule_lookup(chain, handle); | |
2168 | if (IS_ERR(rule)) | |
2169 | return PTR_ERR(rule); | |
2170 | ||
2171 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2172 | return -EEXIST; | |
2173 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2174 | old_rule = rule; | |
2175 | else | |
2176 | return -EOPNOTSUPP; | |
2177 | } else { | |
2178 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
2179 | return -EINVAL; | |
2180 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
2181 | |
2182 | if (chain->use == UINT_MAX) | |
2183 | return -EOVERFLOW; | |
96518518 PM |
2184 | } |
2185 | ||
5e948466 EL |
2186 | if (nla[NFTA_RULE_POSITION]) { |
2187 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2188 | return -EOPNOTSUPP; | |
2189 | ||
2190 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
2191 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
2192 | if (IS_ERR(old_rule)) | |
2193 | return PTR_ERR(old_rule); | |
2194 | } | |
2195 | ||
633c9a84 | 2196 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0ca743a5 | 2197 | |
96518518 PM |
2198 | n = 0; |
2199 | size = 0; | |
2200 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2201 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
2202 | err = -EINVAL; | |
2203 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2204 | goto err1; | |
2205 | if (n == NFT_RULE_MAXEXPRS) | |
2206 | goto err1; | |
0ca743a5 | 2207 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2208 | if (err < 0) |
2209 | goto err1; | |
2210 | size += info[n].ops->size; | |
2211 | n++; | |
2212 | } | |
2213 | } | |
9889840f PM |
2214 | /* Check for overflow of dlen field */ |
2215 | err = -EFBIG; | |
2216 | if (size >= 1 << 12) | |
2217 | goto err1; | |
96518518 | 2218 | |
86f1ec32 | 2219 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2220 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2221 | if (ulen > 0) |
2222 | usize = sizeof(struct nft_userdata) + ulen; | |
2223 | } | |
0768b3b3 | 2224 | |
96518518 | 2225 | err = -ENOMEM; |
86f1ec32 | 2226 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2227 | if (rule == NULL) |
2228 | goto err1; | |
2229 | ||
889f7ee7 | 2230 | nft_activate_next(net, rule); |
0628b123 | 2231 | |
96518518 PM |
2232 | rule->handle = handle; |
2233 | rule->dlen = size; | |
86f1ec32 | 2234 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2235 | |
86f1ec32 PM |
2236 | if (ulen) { |
2237 | udata = nft_userdata(rule); | |
2238 | udata->len = ulen - 1; | |
2239 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2240 | } | |
96518518 | 2241 | |
96518518 PM |
2242 | expr = nft_expr_first(rule); |
2243 | for (i = 0; i < n; i++) { | |
2244 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2245 | if (err < 0) | |
2246 | goto err2; | |
ef1f7df9 | 2247 | info[i].ops = NULL; |
96518518 PM |
2248 | expr = nft_expr_next(expr); |
2249 | } | |
2250 | ||
96518518 | 2251 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
889f7ee7 | 2252 | if (nft_is_active_next(net, old_rule)) { |
ac904ac8 | 2253 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
b380e5c7 | 2254 | old_rule); |
1081d11b | 2255 | if (trans == NULL) { |
0628b123 PNA |
2256 | err = -ENOMEM; |
2257 | goto err2; | |
2258 | } | |
889f7ee7 | 2259 | nft_deactivate_next(net, old_rule); |
ac34b861 | 2260 | chain->use--; |
5bc5c307 | 2261 | list_add_tail_rcu(&rule->list, &old_rule->list); |
0628b123 PNA |
2262 | } else { |
2263 | err = -ENOENT; | |
2264 | goto err2; | |
2265 | } | |
96518518 | 2266 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
2267 | if (old_rule) |
2268 | list_add_rcu(&rule->list, &old_rule->list); | |
2269 | else | |
2270 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2271 | else { | |
2272 | if (old_rule) | |
2273 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2274 | else | |
2275 | list_add_rcu(&rule->list, &chain->rules); | |
2276 | } | |
96518518 | 2277 | |
b380e5c7 | 2278 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
0628b123 PNA |
2279 | err = -ENOMEM; |
2280 | goto err3; | |
2281 | } | |
4fefee57 | 2282 | chain->use++; |
96518518 PM |
2283 | return 0; |
2284 | ||
0628b123 PNA |
2285 | err3: |
2286 | list_del_rcu(&rule->list); | |
96518518 | 2287 | err2: |
62472bce | 2288 | nf_tables_rule_destroy(&ctx, rule); |
96518518 PM |
2289 | err1: |
2290 | for (i = 0; i < n; i++) { | |
2291 | if (info[i].ops != NULL) | |
ef1f7df9 | 2292 | module_put(info[i].ops->type->owner); |
96518518 PM |
2293 | } |
2294 | return err; | |
2295 | } | |
2296 | ||
633c9a84 PNA |
2297 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
2298 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
2299 | const struct nlattr * const nla[]) |
2300 | { | |
2301 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2302 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2303 | struct nft_af_info *afi; |
7c95f6d8 | 2304 | struct nft_table *table; |
cf9dc09d PNA |
2305 | struct nft_chain *chain = NULL; |
2306 | struct nft_rule *rule; | |
0628b123 PNA |
2307 | int family = nfmsg->nfgen_family, err = 0; |
2308 | struct nft_ctx ctx; | |
96518518 | 2309 | |
99633ab2 | 2310 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2311 | if (IS_ERR(afi)) |
2312 | return PTR_ERR(afi); | |
2313 | ||
f2a6d766 | 2314 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2315 | if (IS_ERR(table)) |
2316 | return PTR_ERR(table); | |
2317 | ||
cf9dc09d | 2318 | if (nla[NFTA_RULE_CHAIN]) { |
664b0f8c PNA |
2319 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], |
2320 | genmask); | |
cf9dc09d PNA |
2321 | if (IS_ERR(chain)) |
2322 | return PTR_ERR(chain); | |
2323 | } | |
96518518 | 2324 | |
633c9a84 | 2325 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0628b123 | 2326 | |
cf9dc09d PNA |
2327 | if (chain) { |
2328 | if (nla[NFTA_RULE_HANDLE]) { | |
2329 | rule = nf_tables_rule_lookup(chain, | |
2330 | nla[NFTA_RULE_HANDLE]); | |
2331 | if (IS_ERR(rule)) | |
2332 | return PTR_ERR(rule); | |
96518518 | 2333 | |
5e266fe7 | 2334 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2335 | } else { |
ce24b721 | 2336 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2337 | } |
2338 | } else { | |
2339 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
2340 | if (!nft_is_active_next(net, chain)) |
2341 | continue; | |
2342 | ||
cf9dc09d | 2343 | ctx.chain = chain; |
ce24b721 | 2344 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2345 | if (err < 0) |
2346 | break; | |
2347 | } | |
2348 | } | |
2349 | ||
2350 | return err; | |
2351 | } | |
2352 | ||
20a69341 PM |
2353 | /* |
2354 | * Sets | |
2355 | */ | |
2356 | ||
2357 | static LIST_HEAD(nf_tables_set_ops); | |
2358 | ||
2359 | int nft_register_set(struct nft_set_ops *ops) | |
2360 | { | |
2361 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 2362 | list_add_tail_rcu(&ops->list, &nf_tables_set_ops); |
20a69341 PM |
2363 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2364 | return 0; | |
2365 | } | |
2366 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2367 | ||
2368 | void nft_unregister_set(struct nft_set_ops *ops) | |
2369 | { | |
2370 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 2371 | list_del_rcu(&ops->list); |
20a69341 PM |
2372 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2373 | } | |
2374 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2375 | ||
c50b960c PM |
2376 | /* |
2377 | * Select a set implementation based on the data characteristics and the | |
2378 | * given policy. The total memory use might not be known if no size is | |
2379 | * given, in that case the amount of memory per element is used. | |
2380 | */ | |
2381 | static const struct nft_set_ops * | |
2382 | nft_select_set_ops(const struct nlattr * const nla[], | |
2383 | const struct nft_set_desc *desc, | |
2384 | enum nft_set_policies policy) | |
20a69341 | 2385 | { |
c50b960c PM |
2386 | const struct nft_set_ops *ops, *bops; |
2387 | struct nft_set_estimate est, best; | |
20a69341 PM |
2388 | u32 features; |
2389 | ||
2390 | #ifdef CONFIG_MODULES | |
2391 | if (list_empty(&nf_tables_set_ops)) { | |
2392 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
2393 | request_module("nft-set"); | |
2394 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2395 | if (!list_empty(&nf_tables_set_ops)) | |
2396 | return ERR_PTR(-EAGAIN); | |
2397 | } | |
2398 | #endif | |
2399 | features = 0; | |
2400 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2401 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
4a8678ef | 2402 | features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT; |
20a69341 PM |
2403 | } |
2404 | ||
c50b960c PM |
2405 | bops = NULL; |
2406 | best.size = ~0; | |
2407 | best.class = ~0; | |
2408 | ||
20a69341 PM |
2409 | list_for_each_entry(ops, &nf_tables_set_ops, list) { |
2410 | if ((ops->features & features) != features) | |
2411 | continue; | |
c50b960c PM |
2412 | if (!ops->estimate(desc, features, &est)) |
2413 | continue; | |
2414 | ||
2415 | switch (policy) { | |
2416 | case NFT_SET_POL_PERFORMANCE: | |
2417 | if (est.class < best.class) | |
2418 | break; | |
2419 | if (est.class == best.class && est.size < best.size) | |
2420 | break; | |
2421 | continue; | |
2422 | case NFT_SET_POL_MEMORY: | |
2423 | if (est.size < best.size) | |
2424 | break; | |
2425 | if (est.size == best.size && est.class < best.class) | |
2426 | break; | |
2427 | continue; | |
2428 | default: | |
2429 | break; | |
2430 | } | |
2431 | ||
20a69341 PM |
2432 | if (!try_module_get(ops->owner)) |
2433 | continue; | |
c50b960c PM |
2434 | if (bops != NULL) |
2435 | module_put(bops->owner); | |
2436 | ||
2437 | bops = ops; | |
2438 | best = est; | |
20a69341 PM |
2439 | } |
2440 | ||
c50b960c PM |
2441 | if (bops != NULL) |
2442 | return bops; | |
2443 | ||
20a69341 PM |
2444 | return ERR_PTR(-EOPNOTSUPP); |
2445 | } | |
2446 | ||
2447 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
b2fbd044 LZ |
2448 | [NFTA_SET_TABLE] = { .type = NLA_STRING, |
2449 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
a9bdd836 | 2450 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
cb39ad8b | 2451 | .len = NFT_SET_MAXNAMELEN - 1 }, |
20a69341 PM |
2452 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2453 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2454 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2455 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2456 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2457 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2458 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2459 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2460 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2461 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
e6d8ecac CFG |
2462 | [NFTA_SET_USERDATA] = { .type = NLA_BINARY, |
2463 | .len = NFT_USERDATA_MAXLEN }, | |
8aeff920 | 2464 | [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, |
c50b960c PM |
2465 | }; |
2466 | ||
2467 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2468 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2469 | }; |
2470 | ||
633c9a84 | 2471 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
2472 | const struct sk_buff *skb, |
2473 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
2474 | const struct nlattr * const nla[], |
2475 | u8 genmask) | |
20a69341 PM |
2476 | { |
2477 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
2478 | struct nft_af_info *afi = NULL; |
2479 | struct nft_table *table = NULL; | |
20a69341 | 2480 | |
c9c8e485 PNA |
2481 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
2482 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
2483 | if (IS_ERR(afi)) | |
2484 | return PTR_ERR(afi); | |
2485 | } | |
20a69341 PM |
2486 | |
2487 | if (nla[NFTA_SET_TABLE] != NULL) { | |
ec2c9935 PM |
2488 | if (afi == NULL) |
2489 | return -EAFNOSUPPORT; | |
2490 | ||
f2a6d766 PNA |
2491 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], |
2492 | genmask); | |
20a69341 PM |
2493 | if (IS_ERR(table)) |
2494 | return PTR_ERR(table); | |
2495 | } | |
2496 | ||
633c9a84 | 2497 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2498 | return 0; |
2499 | } | |
2500 | ||
2501 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, | |
37a9cc52 | 2502 | const struct nlattr *nla, u8 genmask) |
20a69341 PM |
2503 | { |
2504 | struct nft_set *set; | |
2505 | ||
2506 | if (nla == NULL) | |
2507 | return ERR_PTR(-EINVAL); | |
2508 | ||
2509 | list_for_each_entry(set, &table->sets, list) { | |
37a9cc52 PNA |
2510 | if (!nla_strcmp(nla, set->name) && |
2511 | nft_active_genmask(set, genmask)) | |
20a69341 PM |
2512 | return set; |
2513 | } | |
2514 | return ERR_PTR(-ENOENT); | |
2515 | } | |
63aea290 | 2516 | EXPORT_SYMBOL_GPL(nf_tables_set_lookup); |
20a69341 | 2517 | |
958bee14 | 2518 | struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
37a9cc52 PNA |
2519 | const struct nlattr *nla, |
2520 | u8 genmask) | |
958bee14 PNA |
2521 | { |
2522 | struct nft_trans *trans; | |
2523 | u32 id = ntohl(nla_get_be32(nla)); | |
2524 | ||
2525 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
37a9cc52 PNA |
2526 | struct nft_set *set = nft_trans_set(trans); |
2527 | ||
958bee14 | 2528 | if (trans->msg_type == NFT_MSG_NEWSET && |
37a9cc52 PNA |
2529 | id == nft_trans_set_id(trans) && |
2530 | nft_active_genmask(set, genmask)) | |
2531 | return set; | |
958bee14 PNA |
2532 | } |
2533 | return ERR_PTR(-ENOENT); | |
2534 | } | |
63aea290 | 2535 | EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid); |
958bee14 | 2536 | |
20a69341 PM |
2537 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
2538 | const char *name) | |
2539 | { | |
2540 | const struct nft_set *i; | |
2541 | const char *p; | |
2542 | unsigned long *inuse; | |
60eb1894 | 2543 | unsigned int n = 0, min = 0; |
20a69341 | 2544 | |
cb39ad8b | 2545 | p = strnchr(name, NFT_SET_MAXNAMELEN, '%'); |
20a69341 PM |
2546 | if (p != NULL) { |
2547 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2548 | return -EINVAL; | |
2549 | ||
2550 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2551 | if (inuse == NULL) | |
2552 | return -ENOMEM; | |
60eb1894 | 2553 | cont: |
20a69341 | 2554 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2555 | int tmp; |
2556 | ||
37a9cc52 PNA |
2557 | if (!nft_is_active_next(ctx->net, set)) |
2558 | continue; | |
14662917 | 2559 | if (!sscanf(i->name, name, &tmp)) |
20a69341 | 2560 | continue; |
60eb1894 | 2561 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2562 | continue; |
14662917 | 2563 | |
60eb1894 | 2564 | set_bit(tmp - min, inuse); |
20a69341 PM |
2565 | } |
2566 | ||
53b70287 | 2567 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2568 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2569 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2570 | memset(inuse, 0, PAGE_SIZE); | |
2571 | goto cont; | |
2572 | } | |
20a69341 PM |
2573 | free_page((unsigned long)inuse); |
2574 | } | |
2575 | ||
60eb1894 | 2576 | snprintf(set->name, sizeof(set->name), name, min + n); |
20a69341 | 2577 | list_for_each_entry(i, &ctx->table->sets, list) { |
37a9cc52 PNA |
2578 | if (!nft_is_active_next(ctx->net, i)) |
2579 | continue; | |
20a69341 PM |
2580 | if (!strcmp(set->name, i->name)) |
2581 | return -ENFILE; | |
2582 | } | |
2583 | return 0; | |
2584 | } | |
2585 | ||
2586 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2587 | const struct nft_set *set, u16 event, u16 flags) | |
2588 | { | |
2589 | struct nfgenmsg *nfmsg; | |
2590 | struct nlmsghdr *nlh; | |
c50b960c | 2591 | struct nlattr *desc; |
128ad332 PNA |
2592 | u32 portid = ctx->portid; |
2593 | u32 seq = ctx->seq; | |
20a69341 PM |
2594 | |
2595 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2596 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2597 | flags); | |
2598 | if (nlh == NULL) | |
2599 | goto nla_put_failure; | |
2600 | ||
2601 | nfmsg = nlmsg_data(nlh); | |
2602 | nfmsg->nfgen_family = ctx->afi->family; | |
2603 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2604 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
2605 | |
2606 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2607 | goto nla_put_failure; | |
2608 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2609 | goto nla_put_failure; | |
2610 | if (set->flags != 0) | |
2611 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2612 | goto nla_put_failure; | |
2613 | ||
2614 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2615 | goto nla_put_failure; | |
2616 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2617 | goto nla_put_failure; | |
2618 | if (set->flags & NFT_SET_MAP) { | |
2619 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2620 | goto nla_put_failure; | |
2621 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2622 | goto nla_put_failure; | |
2623 | } | |
8aeff920 PNA |
2624 | if (set->flags & NFT_SET_OBJECT && |
2625 | nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) | |
2626 | goto nla_put_failure; | |
20a69341 | 2627 | |
761da293 | 2628 | if (set->timeout && |
d3e2a111 AP |
2629 | nla_put_be64(skb, NFTA_SET_TIMEOUT, |
2630 | cpu_to_be64(jiffies_to_msecs(set->timeout)), | |
b46f6ded | 2631 | NFTA_SET_PAD)) |
761da293 PM |
2632 | goto nla_put_failure; |
2633 | if (set->gc_int && | |
2634 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
2635 | goto nla_put_failure; | |
2636 | ||
9363dc4b AB |
2637 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
2638 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
2639 | goto nla_put_failure; | |
2640 | } | |
2641 | ||
e6d8ecac CFG |
2642 | if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) |
2643 | goto nla_put_failure; | |
2644 | ||
c50b960c PM |
2645 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
2646 | if (desc == NULL) | |
2647 | goto nla_put_failure; | |
2648 | if (set->size && | |
2649 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
2650 | goto nla_put_failure; | |
2651 | nla_nest_end(skb, desc); | |
2652 | ||
053c095a JB |
2653 | nlmsg_end(skb, nlh); |
2654 | return 0; | |
20a69341 PM |
2655 | |
2656 | nla_put_failure: | |
2657 | nlmsg_trim(skb, nlh); | |
2658 | return -1; | |
2659 | } | |
2660 | ||
2661 | static int nf_tables_set_notify(const struct nft_ctx *ctx, | |
2662 | const struct nft_set *set, | |
31f8441c | 2663 | int event, gfp_t gfp_flags) |
20a69341 PM |
2664 | { |
2665 | struct sk_buff *skb; | |
128ad332 | 2666 | u32 portid = ctx->portid; |
20a69341 PM |
2667 | int err; |
2668 | ||
128ad332 PNA |
2669 | if (!ctx->report && |
2670 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
20a69341 PM |
2671 | return 0; |
2672 | ||
2673 | err = -ENOBUFS; | |
31f8441c | 2674 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
2675 | if (skb == NULL) |
2676 | goto err; | |
2677 | ||
2678 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2679 | if (err < 0) { | |
2680 | kfree_skb(skb); | |
2681 | goto err; | |
2682 | } | |
2683 | ||
128ad332 | 2684 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, |
31f8441c | 2685 | ctx->report, gfp_flags); |
20a69341 PM |
2686 | err: |
2687 | if (err < 0) | |
99633ab2 | 2688 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
20a69341 PM |
2689 | return err; |
2690 | } | |
2691 | ||
5b96af77 | 2692 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
2693 | { |
2694 | const struct nft_set *set; | |
2695 | unsigned int idx, s_idx = cb->args[0]; | |
7c95f6d8 | 2696 | struct nft_af_info *afi; |
c9c8e485 PNA |
2697 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2698 | struct net *net = sock_net(skb->sk); | |
2699 | int cur_family = cb->args[3]; | |
5b96af77 | 2700 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
2701 | |
2702 | if (cb->args[1]) | |
2703 | return skb->len; | |
2704 | ||
e688a7f8 | 2705 | rcu_read_lock(); |
38e029f1 PNA |
2706 | cb->seq = net->nft.base_seq; |
2707 | ||
e688a7f8 | 2708 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
5b96af77 PNA |
2709 | if (ctx->afi && ctx->afi != afi) |
2710 | continue; | |
2711 | ||
c9c8e485 PNA |
2712 | if (cur_family) { |
2713 | if (afi->family != cur_family) | |
2714 | continue; | |
2715 | ||
2716 | cur_family = 0; | |
2717 | } | |
e688a7f8 | 2718 | list_for_each_entry_rcu(table, &afi->tables, list) { |
5b96af77 PNA |
2719 | if (ctx->table && ctx->table != table) |
2720 | continue; | |
2721 | ||
c9c8e485 PNA |
2722 | if (cur_table) { |
2723 | if (cur_table != table) | |
2724 | continue; | |
2725 | ||
2726 | cur_table = NULL; | |
2727 | } | |
c9c8e485 | 2728 | idx = 0; |
5b96af77 | 2729 | list_for_each_entry_rcu(set, &table->sets, list) { |
c9c8e485 PNA |
2730 | if (idx < s_idx) |
2731 | goto cont; | |
37a9cc52 PNA |
2732 | if (!nft_is_active(net, set)) |
2733 | goto cont; | |
5b96af77 PNA |
2734 | |
2735 | ctx_set = *ctx; | |
2736 | ctx_set.table = table; | |
2737 | ctx_set.afi = afi; | |
2738 | if (nf_tables_fill_set(skb, &ctx_set, set, | |
c9c8e485 PNA |
2739 | NFT_MSG_NEWSET, |
2740 | NLM_F_MULTI) < 0) { | |
2741 | cb->args[0] = idx; | |
2742 | cb->args[2] = (unsigned long) table; | |
2743 | cb->args[3] = afi->family; | |
2744 | goto done; | |
2745 | } | |
38e029f1 | 2746 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 PNA |
2747 | cont: |
2748 | idx++; | |
2749 | } | |
2750 | if (s_idx) | |
2751 | s_idx = 0; | |
2752 | } | |
2753 | } | |
2754 | cb->args[1] = 1; | |
2755 | done: | |
e688a7f8 | 2756 | rcu_read_unlock(); |
c9c8e485 PNA |
2757 | return skb->len; |
2758 | } | |
2759 | ||
5b96af77 | 2760 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 2761 | { |
5b96af77 PNA |
2762 | kfree(cb->data); |
2763 | return 0; | |
20a69341 PM |
2764 | } |
2765 | ||
7b8002a1 PNA |
2766 | static int nf_tables_getset(struct net *net, struct sock *nlsk, |
2767 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
2768 | const struct nlattr * const nla[]) |
2769 | { | |
f2a6d766 | 2770 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
2771 | const struct nft_set *set; |
2772 | struct nft_ctx ctx; | |
2773 | struct sk_buff *skb2; | |
c9c8e485 | 2774 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2775 | int err; |
2776 | ||
01cfa0a4 | 2777 | /* Verify existence before starting dump */ |
f2a6d766 | 2778 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
2779 | if (err < 0) |
2780 | return err; | |
2781 | ||
2782 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2783 | struct netlink_dump_control c = { | |
2784 | .dump = nf_tables_dump_sets, | |
5b96af77 | 2785 | .done = nf_tables_dump_sets_done, |
20a69341 | 2786 | }; |
5b96af77 PNA |
2787 | struct nft_ctx *ctx_dump; |
2788 | ||
2789 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); | |
2790 | if (ctx_dump == NULL) | |
2791 | return -ENOMEM; | |
2792 | ||
2793 | *ctx_dump = ctx; | |
2794 | c.data = ctx_dump; | |
2795 | ||
20a69341 PM |
2796 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2797 | } | |
2798 | ||
c9c8e485 PNA |
2799 | /* Only accept unspec with dump */ |
2800 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2801 | return -EAFNOSUPPORT; | |
eaa2bcd6 PT |
2802 | if (!nla[NFTA_SET_TABLE]) |
2803 | return -EINVAL; | |
c9c8e485 | 2804 | |
37a9cc52 | 2805 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
2806 | if (IS_ERR(set)) |
2807 | return PTR_ERR(set); | |
2808 | ||
2809 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2810 | if (skb2 == NULL) | |
2811 | return -ENOMEM; | |
2812 | ||
2813 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2814 | if (err < 0) | |
2815 | goto err; | |
2816 | ||
2817 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2818 | ||
2819 | err: | |
2820 | kfree_skb(skb2); | |
2821 | return err; | |
2822 | } | |
2823 | ||
c50b960c PM |
2824 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
2825 | struct nft_set_desc *desc, | |
2826 | const struct nlattr *nla) | |
2827 | { | |
2828 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
2829 | int err; | |
2830 | ||
2831 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy); | |
2832 | if (err < 0) | |
2833 | return err; | |
2834 | ||
2835 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
2836 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
2837 | ||
2838 | return 0; | |
2839 | } | |
2840 | ||
633c9a84 PNA |
2841 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
2842 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
2843 | const struct nlattr * const nla[]) |
2844 | { | |
2845 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2846 | u8 genmask = nft_genmask_next(net); |
20a69341 | 2847 | const struct nft_set_ops *ops; |
7c95f6d8 | 2848 | struct nft_af_info *afi; |
20a69341 PM |
2849 | struct nft_table *table; |
2850 | struct nft_set *set; | |
2851 | struct nft_ctx ctx; | |
cb39ad8b | 2852 | char name[NFT_SET_MAXNAMELEN]; |
20a69341 PM |
2853 | unsigned int size; |
2854 | bool create; | |
761da293 | 2855 | u64 timeout; |
8aeff920 | 2856 | u32 ktype, dtype, flags, policy, gc_int, objtype; |
c50b960c | 2857 | struct nft_set_desc desc; |
e6d8ecac CFG |
2858 | unsigned char *udata; |
2859 | u16 udlen; | |
20a69341 PM |
2860 | int err; |
2861 | ||
2862 | if (nla[NFTA_SET_TABLE] == NULL || | |
2863 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
2864 | nla[NFTA_SET_KEY_LEN] == NULL || |
2865 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
2866 | return -EINVAL; |
2867 | ||
c50b960c PM |
2868 | memset(&desc, 0, sizeof(desc)); |
2869 | ||
20a69341 PM |
2870 | ktype = NFT_DATA_VALUE; |
2871 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
2872 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
2873 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
2874 | return -EINVAL; | |
2875 | } | |
2876 | ||
c50b960c | 2877 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 2878 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
2879 | return -EINVAL; |
2880 | ||
2881 | flags = 0; | |
2882 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2883 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
2884 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 | 2885 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
8aeff920 PNA |
2886 | NFT_SET_MAP | NFT_SET_EVAL | |
2887 | NFT_SET_OBJECT)) | |
20a69341 | 2888 | return -EINVAL; |
8aeff920 PNA |
2889 | /* Only one of these operations is supported */ |
2890 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) == | |
2891 | (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) | |
7c6c6e95 | 2892 | return -EOPNOTSUPP; |
20a69341 PM |
2893 | } |
2894 | ||
2895 | dtype = 0; | |
20a69341 PM |
2896 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
2897 | if (!(flags & NFT_SET_MAP)) | |
2898 | return -EINVAL; | |
2899 | ||
2900 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
2901 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
2902 | dtype != NFT_DATA_VERDICT) | |
2903 | return -EINVAL; | |
2904 | ||
2905 | if (dtype != NFT_DATA_VERDICT) { | |
2906 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
2907 | return -EINVAL; | |
c50b960c | 2908 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 2909 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
2910 | return -EINVAL; |
2911 | } else | |
7d740264 | 2912 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
2913 | } else if (flags & NFT_SET_MAP) |
2914 | return -EINVAL; | |
2915 | ||
8aeff920 PNA |
2916 | if (nla[NFTA_SET_OBJ_TYPE] != NULL) { |
2917 | if (!(flags & NFT_SET_OBJECT)) | |
2918 | return -EINVAL; | |
2919 | ||
2920 | objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); | |
2921 | if (objtype == NFT_OBJECT_UNSPEC || | |
2922 | objtype > NFT_OBJECT_MAX) | |
2923 | return -EINVAL; | |
2924 | } else if (flags & NFT_SET_OBJECT) | |
2925 | return -EINVAL; | |
2926 | else | |
2927 | objtype = NFT_OBJECT_UNSPEC; | |
2928 | ||
761da293 PM |
2929 | timeout = 0; |
2930 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
2931 | if (!(flags & NFT_SET_TIMEOUT)) | |
2932 | return -EINVAL; | |
d3e2a111 AP |
2933 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
2934 | nla[NFTA_SET_TIMEOUT]))); | |
761da293 PM |
2935 | } |
2936 | gc_int = 0; | |
2937 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
2938 | if (!(flags & NFT_SET_TIMEOUT)) | |
2939 | return -EINVAL; | |
2940 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
2941 | } | |
2942 | ||
c50b960c PM |
2943 | policy = NFT_SET_POL_PERFORMANCE; |
2944 | if (nla[NFTA_SET_POLICY] != NULL) | |
2945 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
2946 | ||
2947 | if (nla[NFTA_SET_DESC] != NULL) { | |
2948 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
2949 | if (err < 0) | |
2950 | return err; | |
2951 | } | |
2952 | ||
20a69341 PM |
2953 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
2954 | ||
99633ab2 | 2955 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
2956 | if (IS_ERR(afi)) |
2957 | return PTR_ERR(afi); | |
2958 | ||
f2a6d766 | 2959 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask); |
20a69341 PM |
2960 | if (IS_ERR(table)) |
2961 | return PTR_ERR(table); | |
2962 | ||
633c9a84 | 2963 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 | 2964 | |
37a9cc52 | 2965 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
2966 | if (IS_ERR(set)) { |
2967 | if (PTR_ERR(set) != -ENOENT) | |
2968 | return PTR_ERR(set); | |
2969 | set = NULL; | |
2970 | } | |
2971 | ||
2972 | if (set != NULL) { | |
2973 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2974 | return -EEXIST; | |
2975 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2976 | return -EOPNOTSUPP; | |
2977 | return 0; | |
2978 | } | |
2979 | ||
2980 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2981 | return -ENOENT; | |
2982 | ||
c50b960c | 2983 | ops = nft_select_set_ops(nla, &desc, policy); |
20a69341 PM |
2984 | if (IS_ERR(ops)) |
2985 | return PTR_ERR(ops); | |
2986 | ||
e6d8ecac CFG |
2987 | udlen = 0; |
2988 | if (nla[NFTA_SET_USERDATA]) | |
2989 | udlen = nla_len(nla[NFTA_SET_USERDATA]); | |
2990 | ||
20a69341 PM |
2991 | size = 0; |
2992 | if (ops->privsize != NULL) | |
2993 | size = ops->privsize(nla); | |
2994 | ||
2995 | err = -ENOMEM; | |
e6d8ecac | 2996 | set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); |
20a69341 PM |
2997 | if (set == NULL) |
2998 | goto err1; | |
2999 | ||
3000 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); | |
3001 | err = nf_tables_set_alloc_name(&ctx, set, name); | |
3002 | if (err < 0) | |
3003 | goto err2; | |
3004 | ||
e6d8ecac CFG |
3005 | udata = NULL; |
3006 | if (udlen) { | |
3007 | udata = set->data + size; | |
3008 | nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); | |
3009 | } | |
3010 | ||
20a69341 PM |
3011 | INIT_LIST_HEAD(&set->bindings); |
3012 | set->ops = ops; | |
3013 | set->ktype = ktype; | |
c50b960c | 3014 | set->klen = desc.klen; |
20a69341 | 3015 | set->dtype = dtype; |
8aeff920 | 3016 | set->objtype = objtype; |
c50b960c | 3017 | set->dlen = desc.dlen; |
20a69341 | 3018 | set->flags = flags; |
c50b960c | 3019 | set->size = desc.size; |
9363dc4b | 3020 | set->policy = policy; |
e6d8ecac CFG |
3021 | set->udlen = udlen; |
3022 | set->udata = udata; | |
761da293 PM |
3023 | set->timeout = timeout; |
3024 | set->gc_int = gc_int; | |
20a69341 | 3025 | |
c50b960c | 3026 | err = ops->init(set, &desc, nla); |
20a69341 PM |
3027 | if (err < 0) |
3028 | goto err2; | |
3029 | ||
958bee14 | 3030 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 | 3031 | if (err < 0) |
c17c3cdf | 3032 | goto err3; |
20a69341 | 3033 | |
e688a7f8 | 3034 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 3035 | table->use++; |
20a69341 PM |
3036 | return 0; |
3037 | ||
c17c3cdf LZ |
3038 | err3: |
3039 | ops->destroy(set); | |
20a69341 PM |
3040 | err2: |
3041 | kfree(set); | |
3042 | err1: | |
3043 | module_put(ops->owner); | |
3044 | return err; | |
3045 | } | |
3046 | ||
958bee14 | 3047 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 3048 | { |
20a69341 PM |
3049 | set->ops->destroy(set); |
3050 | module_put(set->ops->owner); | |
3051 | kfree(set); | |
3052 | } | |
3053 | ||
958bee14 PNA |
3054 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
3055 | { | |
e688a7f8 | 3056 | list_del_rcu(&set->list); |
31f8441c | 3057 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
3058 | nft_set_destroy(set); |
3059 | } | |
3060 | ||
633c9a84 PNA |
3061 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
3062 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
3063 | const struct nlattr * const nla[]) |
3064 | { | |
c9c8e485 | 3065 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
f2a6d766 | 3066 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3067 | struct nft_set *set; |
3068 | struct nft_ctx ctx; | |
3069 | int err; | |
3070 | ||
ec2c9935 PM |
3071 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
3072 | return -EAFNOSUPPORT; | |
20a69341 PM |
3073 | if (nla[NFTA_SET_TABLE] == NULL) |
3074 | return -EINVAL; | |
3075 | ||
f2a6d766 | 3076 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3077 | if (err < 0) |
3078 | return err; | |
3079 | ||
37a9cc52 | 3080 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3081 | if (IS_ERR(set)) |
3082 | return PTR_ERR(set); | |
3083 | if (!list_empty(&set->bindings)) | |
3084 | return -EBUSY; | |
3085 | ||
ee01d542 | 3086 | return nft_delset(&ctx, set); |
20a69341 PM |
3087 | } |
3088 | ||
3089 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 3090 | struct nft_set *set, |
20a69341 | 3091 | const struct nft_set_iter *iter, |
de70185d | 3092 | struct nft_set_elem *elem) |
20a69341 | 3093 | { |
fe2811eb | 3094 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3095 | enum nft_registers dreg; |
3096 | ||
3097 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
3098 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
3099 | set->dtype == NFT_DATA_VERDICT ? | |
3100 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
3101 | set->dlen); | |
20a69341 PM |
3102 | } |
3103 | ||
3104 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3105 | struct nft_set_binding *binding) | |
3106 | { | |
3107 | struct nft_set_binding *i; | |
3108 | struct nft_set_iter iter; | |
3109 | ||
3110 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
3111 | return -EBUSY; | |
3112 | ||
11113e19 | 3113 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
3114 | /* If the set is already bound to the same chain all |
3115 | * jumps are already validated for that chain. | |
3116 | */ | |
3117 | list_for_each_entry(i, &set->bindings, list) { | |
a4684402 | 3118 | if (i->flags & NFT_SET_MAP && |
11113e19 | 3119 | i->chain == binding->chain) |
20a69341 PM |
3120 | goto bind; |
3121 | } | |
3122 | ||
8588ac09 | 3123 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
3124 | iter.skip = 0; |
3125 | iter.count = 0; | |
3126 | iter.err = 0; | |
3127 | iter.fn = nf_tables_bind_check_setelem; | |
3128 | ||
3129 | set->ops->walk(ctx, set, &iter); | |
a02f4248 | 3130 | if (iter.err < 0) |
20a69341 | 3131 | return iter.err; |
20a69341 PM |
3132 | } |
3133 | bind: | |
3134 | binding->chain = ctx->chain; | |
e688a7f8 | 3135 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
3136 | return 0; |
3137 | } | |
63aea290 | 3138 | EXPORT_SYMBOL_GPL(nf_tables_bind_set); |
20a69341 PM |
3139 | |
3140 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3141 | struct nft_set_binding *binding) | |
3142 | { | |
e688a7f8 | 3143 | list_del_rcu(&binding->list); |
20a69341 | 3144 | |
958bee14 | 3145 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
37a9cc52 | 3146 | nft_is_active(ctx->net, set)) |
20a69341 PM |
3147 | nf_tables_set_destroy(ctx, set); |
3148 | } | |
63aea290 | 3149 | EXPORT_SYMBOL_GPL(nf_tables_unbind_set); |
20a69341 | 3150 | |
3ac4c07a PM |
3151 | const struct nft_set_ext_type nft_set_ext_types[] = { |
3152 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 3153 | .align = __alignof__(u32), |
3ac4c07a PM |
3154 | }, |
3155 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 3156 | .align = __alignof__(u32), |
3ac4c07a | 3157 | }, |
f25ad2e9 PM |
3158 | [NFT_SET_EXT_EXPR] = { |
3159 | .align = __alignof__(struct nft_expr), | |
3160 | }, | |
8aeff920 PNA |
3161 | [NFT_SET_EXT_OBJREF] = { |
3162 | .len = sizeof(struct nft_object *), | |
3163 | .align = __alignof__(struct nft_object *), | |
3164 | }, | |
3ac4c07a PM |
3165 | [NFT_SET_EXT_FLAGS] = { |
3166 | .len = sizeof(u8), | |
3167 | .align = __alignof__(u8), | |
3168 | }, | |
c3e1b005 PM |
3169 | [NFT_SET_EXT_TIMEOUT] = { |
3170 | .len = sizeof(u64), | |
3171 | .align = __alignof__(u64), | |
3172 | }, | |
3173 | [NFT_SET_EXT_EXPIRATION] = { | |
3174 | .len = sizeof(unsigned long), | |
3175 | .align = __alignof__(unsigned long), | |
3176 | }, | |
68e942e8 PM |
3177 | [NFT_SET_EXT_USERDATA] = { |
3178 | .len = sizeof(struct nft_userdata), | |
3179 | .align = __alignof__(struct nft_userdata), | |
3180 | }, | |
3ac4c07a PM |
3181 | }; |
3182 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
3183 | ||
20a69341 PM |
3184 | /* |
3185 | * Set elements | |
3186 | */ | |
3187 | ||
3188 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
3189 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
3190 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
3191 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 3192 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
3193 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
3194 | .len = NFT_USERDATA_MAXLEN }, | |
20a69341 PM |
3195 | }; |
3196 | ||
3197 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
b2fbd044 LZ |
3198 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, |
3199 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
3200 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, | |
3201 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
20a69341 | 3202 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
958bee14 | 3203 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
3204 | }; |
3205 | ||
633c9a84 | 3206 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
3207 | const struct sk_buff *skb, |
3208 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
3209 | const struct nlattr * const nla[], |
3210 | u8 genmask) | |
20a69341 PM |
3211 | { |
3212 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
3213 | struct nft_af_info *afi; |
3214 | struct nft_table *table; | |
20a69341 | 3215 | |
99633ab2 | 3216 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
3217 | if (IS_ERR(afi)) |
3218 | return PTR_ERR(afi); | |
3219 | ||
f2a6d766 PNA |
3220 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE], |
3221 | genmask); | |
20a69341 PM |
3222 | if (IS_ERR(table)) |
3223 | return PTR_ERR(table); | |
3224 | ||
633c9a84 | 3225 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
3226 | return 0; |
3227 | } | |
3228 | ||
3229 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
3230 | const struct nft_set *set, | |
3231 | const struct nft_set_elem *elem) | |
3232 | { | |
fe2811eb | 3233 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3234 | unsigned char *b = skb_tail_pointer(skb); |
3235 | struct nlattr *nest; | |
3236 | ||
3237 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
3238 | if (nest == NULL) | |
3239 | goto nla_put_failure; | |
3240 | ||
fe2811eb PM |
3241 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
3242 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
3243 | goto nla_put_failure; |
3244 | ||
fe2811eb PM |
3245 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3246 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
3247 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
3248 | set->dlen) < 0) | |
3249 | goto nla_put_failure; | |
3250 | ||
f25ad2e9 PM |
3251 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3252 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3253 | goto nla_put_failure; | |
3254 | ||
8aeff920 PNA |
3255 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && |
3256 | nla_put_string(skb, NFTA_SET_ELEM_OBJREF, | |
3257 | (*nft_set_ext_obj(ext))->name) < 0) | |
3258 | goto nla_put_failure; | |
3259 | ||
fe2811eb PM |
3260 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3261 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3262 | htonl(*nft_set_ext_flags(ext)))) | |
3263 | goto nla_put_failure; | |
20a69341 | 3264 | |
c3e1b005 PM |
3265 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3266 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
d3e2a111 AP |
3267 | cpu_to_be64(jiffies_to_msecs( |
3268 | *nft_set_ext_timeout(ext))), | |
b46f6ded | 3269 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3270 | goto nla_put_failure; |
3271 | ||
3272 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
3273 | unsigned long expires, now = jiffies; | |
3274 | ||
3275 | expires = *nft_set_ext_expiration(ext); | |
3276 | if (time_before(now, expires)) | |
3277 | expires -= now; | |
3278 | else | |
3279 | expires = 0; | |
3280 | ||
3281 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
b46f6ded ND |
3282 | cpu_to_be64(jiffies_to_msecs(expires)), |
3283 | NFTA_SET_ELEM_PAD)) | |
c3e1b005 PM |
3284 | goto nla_put_failure; |
3285 | } | |
3286 | ||
68e942e8 PM |
3287 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3288 | struct nft_userdata *udata; | |
3289 | ||
3290 | udata = nft_set_ext_userdata(ext); | |
3291 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3292 | udata->len + 1, udata->data)) | |
3293 | goto nla_put_failure; | |
3294 | } | |
3295 | ||
20a69341 PM |
3296 | nla_nest_end(skb, nest); |
3297 | return 0; | |
3298 | ||
3299 | nla_put_failure: | |
3300 | nlmsg_trim(skb, b); | |
3301 | return -EMSGSIZE; | |
3302 | } | |
3303 | ||
3304 | struct nft_set_dump_args { | |
3305 | const struct netlink_callback *cb; | |
3306 | struct nft_set_iter iter; | |
3307 | struct sk_buff *skb; | |
3308 | }; | |
3309 | ||
3310 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
de70185d | 3311 | struct nft_set *set, |
20a69341 | 3312 | const struct nft_set_iter *iter, |
de70185d | 3313 | struct nft_set_elem *elem) |
20a69341 PM |
3314 | { |
3315 | struct nft_set_dump_args *args; | |
3316 | ||
3317 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3318 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3319 | } | |
3320 | ||
3321 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) | |
3322 | { | |
633c9a84 | 3323 | struct net *net = sock_net(skb->sk); |
f2a6d766 | 3324 | u8 genmask = nft_genmask_cur(net); |
de70185d | 3325 | struct nft_set *set; |
20a69341 PM |
3326 | struct nft_set_dump_args args; |
3327 | struct nft_ctx ctx; | |
3328 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; | |
3329 | struct nfgenmsg *nfmsg; | |
3330 | struct nlmsghdr *nlh; | |
3331 | struct nlattr *nest; | |
3332 | u32 portid, seq; | |
3333 | int event, err; | |
3334 | ||
720e0dfa MN |
3335 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
3336 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); | |
20a69341 PM |
3337 | if (err < 0) |
3338 | return err; | |
3339 | ||
633c9a84 | 3340 | err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh, |
f2a6d766 | 3341 | (void *)nla, genmask); |
20a69341 PM |
3342 | if (err < 0) |
3343 | return err; | |
3344 | ||
37a9cc52 PNA |
3345 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3346 | genmask); | |
20a69341 PM |
3347 | if (IS_ERR(set)) |
3348 | return PTR_ERR(set); | |
3349 | ||
3350 | event = NFT_MSG_NEWSETELEM; | |
3351 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
3352 | portid = NETLINK_CB(cb->skb).portid; | |
3353 | seq = cb->nlh->nlmsg_seq; | |
3354 | ||
3355 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3356 | NLM_F_MULTI); | |
3357 | if (nlh == NULL) | |
3358 | goto nla_put_failure; | |
3359 | ||
3360 | nfmsg = nlmsg_data(nlh); | |
6403d962 | 3361 | nfmsg->nfgen_family = ctx.afi->family; |
20a69341 | 3362 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 3363 | nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff); |
20a69341 PM |
3364 | |
3365 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) | |
3366 | goto nla_put_failure; | |
3367 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3368 | goto nla_put_failure; | |
3369 | ||
3370 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3371 | if (nest == NULL) | |
3372 | goto nla_put_failure; | |
3373 | ||
8588ac09 PNA |
3374 | args.cb = cb; |
3375 | args.skb = skb; | |
3376 | args.iter.genmask = nft_genmask_cur(ctx.net); | |
3377 | args.iter.skip = cb->args[0]; | |
3378 | args.iter.count = 0; | |
3379 | args.iter.err = 0; | |
3380 | args.iter.fn = nf_tables_dump_setelem; | |
20a69341 PM |
3381 | set->ops->walk(&ctx, set, &args.iter); |
3382 | ||
3383 | nla_nest_end(skb, nest); | |
3384 | nlmsg_end(skb, nlh); | |
3385 | ||
3386 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3387 | return args.iter.err; | |
3388 | if (args.iter.count == cb->args[0]) | |
3389 | return 0; | |
3390 | ||
3391 | cb->args[0] = args.iter.count; | |
3392 | return skb->len; | |
3393 | ||
3394 | nla_put_failure: | |
3395 | return -ENOSPC; | |
3396 | } | |
3397 | ||
7b8002a1 PNA |
3398 | static int nf_tables_getsetelem(struct net *net, struct sock *nlsk, |
3399 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
3400 | const struct nlattr * const nla[]) |
3401 | { | |
f2a6d766 | 3402 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
3403 | const struct nft_set *set; |
3404 | struct nft_ctx ctx; | |
3405 | int err; | |
3406 | ||
f2a6d766 | 3407 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3408 | if (err < 0) |
3409 | return err; | |
3410 | ||
37a9cc52 PNA |
3411 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3412 | genmask); | |
20a69341 PM |
3413 | if (IS_ERR(set)) |
3414 | return PTR_ERR(set); | |
3415 | ||
3416 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3417 | struct netlink_dump_control c = { | |
3418 | .dump = nf_tables_dump_set, | |
3419 | }; | |
3420 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
3421 | } | |
3422 | return -EOPNOTSUPP; | |
3423 | } | |
3424 | ||
d60ce62f AB |
3425 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
3426 | const struct nft_ctx *ctx, u32 seq, | |
3427 | u32 portid, int event, u16 flags, | |
3428 | const struct nft_set *set, | |
3429 | const struct nft_set_elem *elem) | |
3430 | { | |
3431 | struct nfgenmsg *nfmsg; | |
3432 | struct nlmsghdr *nlh; | |
3433 | struct nlattr *nest; | |
3434 | int err; | |
3435 | ||
3436 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
3437 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3438 | flags); | |
3439 | if (nlh == NULL) | |
3440 | goto nla_put_failure; | |
3441 | ||
3442 | nfmsg = nlmsg_data(nlh); | |
3443 | nfmsg->nfgen_family = ctx->afi->family; | |
3444 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 3445 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
3446 | |
3447 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3448 | goto nla_put_failure; | |
3449 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3450 | goto nla_put_failure; | |
3451 | ||
3452 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3453 | if (nest == NULL) | |
3454 | goto nla_put_failure; | |
3455 | ||
3456 | err = nf_tables_fill_setelem(skb, set, elem); | |
3457 | if (err < 0) | |
3458 | goto nla_put_failure; | |
3459 | ||
3460 | nla_nest_end(skb, nest); | |
3461 | ||
053c095a JB |
3462 | nlmsg_end(skb, nlh); |
3463 | return 0; | |
d60ce62f AB |
3464 | |
3465 | nla_put_failure: | |
3466 | nlmsg_trim(skb, nlh); | |
3467 | return -1; | |
3468 | } | |
3469 | ||
3470 | static int nf_tables_setelem_notify(const struct nft_ctx *ctx, | |
3471 | const struct nft_set *set, | |
3472 | const struct nft_set_elem *elem, | |
3473 | int event, u16 flags) | |
3474 | { | |
128ad332 PNA |
3475 | struct net *net = ctx->net; |
3476 | u32 portid = ctx->portid; | |
d60ce62f AB |
3477 | struct sk_buff *skb; |
3478 | int err; | |
3479 | ||
128ad332 | 3480 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
d60ce62f AB |
3481 | return 0; |
3482 | ||
3483 | err = -ENOBUFS; | |
3484 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
3485 | if (skb == NULL) | |
3486 | goto err; | |
3487 | ||
3488 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
3489 | set, elem); | |
3490 | if (err < 0) { | |
3491 | kfree_skb(skb); | |
3492 | goto err; | |
3493 | } | |
3494 | ||
128ad332 | 3495 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
d60ce62f AB |
3496 | GFP_KERNEL); |
3497 | err: | |
3498 | if (err < 0) | |
3499 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
3500 | return err; | |
3501 | } | |
3502 | ||
60319eb1 PNA |
3503 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
3504 | int msg_type, | |
3505 | struct nft_set *set) | |
3506 | { | |
3507 | struct nft_trans *trans; | |
3508 | ||
3509 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
3510 | if (trans == NULL) | |
3511 | return NULL; | |
3512 | ||
3513 | nft_trans_elem_set(trans) = set; | |
3514 | return trans; | |
3515 | } | |
3516 | ||
22fe54d5 PM |
3517 | void *nft_set_elem_init(const struct nft_set *set, |
3518 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 3519 | const u32 *key, const u32 *data, |
22fe54d5 | 3520 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
3521 | { |
3522 | struct nft_set_ext *ext; | |
3523 | void *elem; | |
3524 | ||
3525 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
3526 | if (elem == NULL) | |
3527 | return NULL; | |
3528 | ||
3529 | ext = nft_set_elem_ext(set, elem); | |
3530 | nft_set_ext_init(ext, tmpl); | |
3531 | ||
3532 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
3533 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3534 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
3535 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
3536 | *nft_set_ext_expiration(ext) = | |
d3e2a111 | 3537 | jiffies + timeout; |
c3e1b005 PM |
3538 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) |
3539 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
3540 | |
3541 | return elem; | |
3542 | } | |
3543 | ||
61f9e292 LZ |
3544 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
3545 | bool destroy_expr) | |
61edafbb PM |
3546 | { |
3547 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3548 | ||
3549 | nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE); | |
3550 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3551 | nft_data_uninit(nft_set_ext_data(ext), set->dtype); | |
61f9e292 | 3552 | if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) |
f25ad2e9 | 3553 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); |
8aeff920 PNA |
3554 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) |
3555 | (*nft_set_ext_obj(ext))->use--; | |
61edafbb PM |
3556 | kfree(elem); |
3557 | } | |
3558 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
3559 | ||
0e9091d6 PNA |
3560 | static int nft_setelem_parse_flags(const struct nft_set *set, |
3561 | const struct nlattr *attr, u32 *flags) | |
3562 | { | |
3563 | if (attr == NULL) | |
3564 | return 0; | |
3565 | ||
3566 | *flags = ntohl(nla_get_be32(attr)); | |
3567 | if (*flags & ~NFT_SET_ELEM_INTERVAL_END) | |
3568 | return -EINVAL; | |
3569 | if (!(set->flags & NFT_SET_INTERVAL) && | |
3570 | *flags & NFT_SET_ELEM_INTERVAL_END) | |
3571 | return -EINVAL; | |
3572 | ||
3573 | return 0; | |
3574 | } | |
3575 | ||
60319eb1 | 3576 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
c016c7e4 | 3577 | const struct nlattr *attr, u32 nlmsg_flags) |
20a69341 PM |
3578 | { |
3579 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
8aeff920 | 3580 | u8 genmask = nft_genmask_next(ctx->net); |
20a69341 | 3581 | struct nft_data_desc d1, d2; |
fe2811eb | 3582 | struct nft_set_ext_tmpl tmpl; |
c016c7e4 | 3583 | struct nft_set_ext *ext, *ext2; |
20a69341 PM |
3584 | struct nft_set_elem elem; |
3585 | struct nft_set_binding *binding; | |
8aeff920 | 3586 | struct nft_object *obj = NULL; |
68e942e8 | 3587 | struct nft_userdata *udata; |
fe2811eb | 3588 | struct nft_data data; |
20a69341 | 3589 | enum nft_registers dreg; |
60319eb1 | 3590 | struct nft_trans *trans; |
0e9091d6 | 3591 | u32 flags = 0; |
c3e1b005 | 3592 | u64 timeout; |
68e942e8 | 3593 | u8 ulen; |
20a69341 PM |
3594 | int err; |
3595 | ||
3596 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3597 | nft_set_elem_policy); | |
3598 | if (err < 0) | |
3599 | return err; | |
3600 | ||
3601 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3602 | return -EINVAL; | |
3603 | ||
fe2811eb PM |
3604 | nft_set_ext_prepare(&tmpl); |
3605 | ||
0e9091d6 PNA |
3606 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); |
3607 | if (err < 0) | |
3608 | return err; | |
3609 | if (flags != 0) | |
3610 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
3611 | |
3612 | if (set->flags & NFT_SET_MAP) { | |
3613 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 3614 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 3615 | return -EINVAL; |
bd7fc645 | 3616 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 3617 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 3618 | return -EINVAL; |
20a69341 PM |
3619 | } else { |
3620 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
3621 | return -EINVAL; | |
3622 | } | |
3623 | ||
c3e1b005 PM |
3624 | timeout = 0; |
3625 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
3626 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
3627 | return -EINVAL; | |
d3e2a111 AP |
3628 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3629 | nla[NFTA_SET_ELEM_TIMEOUT]))); | |
c3e1b005 PM |
3630 | } else if (set->flags & NFT_SET_TIMEOUT) { |
3631 | timeout = set->timeout; | |
3632 | } | |
3633 | ||
7d740264 | 3634 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 3635 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3636 | if (err < 0) |
3637 | goto err1; | |
3638 | err = -EINVAL; | |
3639 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
3640 | goto err2; | |
3641 | ||
7d740264 | 3642 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
3643 | if (timeout > 0) { |
3644 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
3645 | if (timeout != set->timeout) | |
3646 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
3647 | } | |
fe2811eb | 3648 | |
8aeff920 PNA |
3649 | if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { |
3650 | if (!(set->flags & NFT_SET_OBJECT)) { | |
3651 | err = -EINVAL; | |
3652 | goto err2; | |
3653 | } | |
3654 | obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF], | |
3655 | set->objtype, genmask); | |
3656 | if (IS_ERR(obj)) { | |
3657 | err = PTR_ERR(obj); | |
3658 | goto err2; | |
3659 | } | |
3660 | nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); | |
3661 | } | |
3662 | ||
20a69341 | 3663 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
3664 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
3665 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
3666 | if (err < 0) |
3667 | goto err2; | |
3668 | ||
3669 | err = -EINVAL; | |
3670 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
3671 | goto err3; | |
3672 | ||
3673 | dreg = nft_type_to_reg(set->dtype); | |
3674 | list_for_each_entry(binding, &set->bindings, list) { | |
3675 | struct nft_ctx bind_ctx = { | |
58c78e10 | 3676 | .net = ctx->net, |
20a69341 PM |
3677 | .afi = ctx->afi, |
3678 | .table = ctx->table, | |
7c95f6d8 | 3679 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
3680 | }; |
3681 | ||
11113e19 PM |
3682 | if (!(binding->flags & NFT_SET_MAP)) |
3683 | continue; | |
3684 | ||
1ec10212 PM |
3685 | err = nft_validate_register_store(&bind_ctx, dreg, |
3686 | &data, | |
3687 | d2.type, d2.len); | |
20a69341 PM |
3688 | if (err < 0) |
3689 | goto err3; | |
3690 | } | |
fe2811eb | 3691 | |
7d740264 | 3692 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
3693 | } |
3694 | ||
68e942e8 PM |
3695 | /* The full maximum length of userdata can exceed the maximum |
3696 | * offset value (U8_MAX) for following extensions, therefor it | |
3697 | * must be the last extension added. | |
3698 | */ | |
3699 | ulen = 0; | |
3700 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
3701 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
3702 | if (ulen > 0) | |
3703 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
3704 | ulen); | |
3705 | } | |
3706 | ||
fe2811eb | 3707 | err = -ENOMEM; |
7d740264 | 3708 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 3709 | timeout, GFP_KERNEL); |
fe2811eb PM |
3710 | if (elem.priv == NULL) |
3711 | goto err3; | |
3712 | ||
3713 | ext = nft_set_elem_ext(set, elem.priv); | |
3714 | if (flags) | |
3715 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
3716 | if (ulen > 0) { |
3717 | udata = nft_set_ext_userdata(ext); | |
3718 | udata->len = ulen - 1; | |
3719 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
3720 | } | |
8aeff920 PNA |
3721 | if (obj) { |
3722 | *nft_set_ext_obj(ext) = obj; | |
3723 | obj->use++; | |
3724 | } | |
fe2811eb | 3725 | |
60319eb1 PNA |
3726 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
3727 | if (trans == NULL) | |
fe2811eb | 3728 | goto err4; |
60319eb1 | 3729 | |
69086658 | 3730 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
c016c7e4 PNA |
3731 | err = set->ops->insert(ctx->net, set, &elem, &ext2); |
3732 | if (err) { | |
3733 | if (err == -EEXIST) { | |
8aeff920 PNA |
3734 | if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3735 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && | |
3736 | memcmp(nft_set_ext_data(ext), | |
3737 | nft_set_ext_data(ext2), set->dlen) != 0) || | |
3738 | (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && | |
3739 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && | |
3740 | *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) | |
c016c7e4 PNA |
3741 | err = -EBUSY; |
3742 | else if (!(nlmsg_flags & NLM_F_EXCL)) | |
3743 | err = 0; | |
3744 | } | |
fe2811eb | 3745 | goto err5; |
c016c7e4 | 3746 | } |
20a69341 | 3747 | |
35d0ac90 PNA |
3748 | if (set->size && |
3749 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { | |
3750 | err = -ENFILE; | |
3751 | goto err6; | |
3752 | } | |
3753 | ||
60319eb1 | 3754 | nft_trans_elem(trans) = elem; |
46bbafce | 3755 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
3756 | return 0; |
3757 | ||
35d0ac90 PNA |
3758 | err6: |
3759 | set->ops->remove(set, &elem); | |
fe2811eb | 3760 | err5: |
60319eb1 | 3761 | kfree(trans); |
fe2811eb PM |
3762 | err4: |
3763 | kfree(elem.priv); | |
20a69341 PM |
3764 | err3: |
3765 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
fe2811eb | 3766 | nft_data_uninit(&data, d2.type); |
20a69341 | 3767 | err2: |
7d740264 | 3768 | nft_data_uninit(&elem.key.val, d1.type); |
20a69341 PM |
3769 | err1: |
3770 | return err; | |
3771 | } | |
3772 | ||
633c9a84 PNA |
3773 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
3774 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
3775 | const struct nlattr * const nla[]) |
3776 | { | |
f2a6d766 | 3777 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3778 | const struct nlattr *attr; |
3779 | struct nft_set *set; | |
3780 | struct nft_ctx ctx; | |
60319eb1 | 3781 | int rem, err = 0; |
20a69341 | 3782 | |
7d5570ca PNA |
3783 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
3784 | return -EINVAL; | |
3785 | ||
f2a6d766 | 3786 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3787 | if (err < 0) |
3788 | return err; | |
3789 | ||
37a9cc52 PNA |
3790 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3791 | genmask); | |
958bee14 PNA |
3792 | if (IS_ERR(set)) { |
3793 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { | |
3794 | set = nf_tables_set_lookup_byid(net, | |
37a9cc52 PNA |
3795 | nla[NFTA_SET_ELEM_LIST_SET_ID], |
3796 | genmask); | |
958bee14 PNA |
3797 | } |
3798 | if (IS_ERR(set)) | |
3799 | return PTR_ERR(set); | |
3800 | } | |
3801 | ||
20a69341 PM |
3802 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
3803 | return -EBUSY; | |
3804 | ||
3805 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
c016c7e4 | 3806 | err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags); |
35d0ac90 | 3807 | if (err < 0) |
60319eb1 | 3808 | break; |
20a69341 | 3809 | } |
60319eb1 | 3810 | return err; |
20a69341 PM |
3811 | } |
3812 | ||
60319eb1 | 3813 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
3814 | const struct nlattr *attr) |
3815 | { | |
3816 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3971ca14 | 3817 | struct nft_set_ext_tmpl tmpl; |
20a69341 PM |
3818 | struct nft_data_desc desc; |
3819 | struct nft_set_elem elem; | |
3971ca14 | 3820 | struct nft_set_ext *ext; |
60319eb1 | 3821 | struct nft_trans *trans; |
3971ca14 PNA |
3822 | u32 flags = 0; |
3823 | void *priv; | |
20a69341 PM |
3824 | int err; |
3825 | ||
3826 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3827 | nft_set_elem_policy); | |
3828 | if (err < 0) | |
3829 | goto err1; | |
3830 | ||
3831 | err = -EINVAL; | |
3832 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3833 | goto err1; | |
3834 | ||
3971ca14 PNA |
3835 | nft_set_ext_prepare(&tmpl); |
3836 | ||
3837 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
3838 | if (err < 0) | |
3839 | return err; | |
3840 | if (flags != 0) | |
3841 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
3842 | ||
7d740264 | 3843 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 3844 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3845 | if (err < 0) |
3846 | goto err1; | |
3847 | ||
3848 | err = -EINVAL; | |
3849 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
3850 | goto err2; | |
3851 | ||
3971ca14 PNA |
3852 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len); |
3853 | ||
3854 | err = -ENOMEM; | |
3855 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0, | |
3856 | GFP_KERNEL); | |
3857 | if (elem.priv == NULL) | |
3858 | goto err2; | |
3859 | ||
3860 | ext = nft_set_elem_ext(set, elem.priv); | |
3861 | if (flags) | |
3862 | *nft_set_ext_flags(ext) = flags; | |
3863 | ||
60319eb1 | 3864 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
3865 | if (trans == NULL) { |
3866 | err = -ENOMEM; | |
3971ca14 | 3867 | goto err3; |
609ccf08 | 3868 | } |
20a69341 | 3869 | |
42a55769 | 3870 | priv = set->ops->deactivate(ctx->net, set, &elem); |
3971ca14 | 3871 | if (priv == NULL) { |
cc02e457 | 3872 | err = -ENOENT; |
3971ca14 | 3873 | goto err4; |
cc02e457 | 3874 | } |
3971ca14 PNA |
3875 | kfree(elem.priv); |
3876 | elem.priv = priv; | |
cc02e457 | 3877 | |
60319eb1 | 3878 | nft_trans_elem(trans) = elem; |
46bbafce | 3879 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 3880 | return 0; |
cc02e457 | 3881 | |
3971ca14 | 3882 | err4: |
cc02e457 | 3883 | kfree(trans); |
3971ca14 PNA |
3884 | err3: |
3885 | kfree(elem.priv); | |
20a69341 | 3886 | err2: |
7d740264 | 3887 | nft_data_uninit(&elem.key.val, desc.type); |
20a69341 PM |
3888 | err1: |
3889 | return err; | |
3890 | } | |
3891 | ||
8411b644 | 3892 | static int nft_flush_set(const struct nft_ctx *ctx, |
de70185d | 3893 | struct nft_set *set, |
8411b644 | 3894 | const struct nft_set_iter *iter, |
de70185d | 3895 | struct nft_set_elem *elem) |
8411b644 PNA |
3896 | { |
3897 | struct nft_trans *trans; | |
3898 | int err; | |
3899 | ||
3900 | trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, | |
3901 | sizeof(struct nft_trans_elem), GFP_ATOMIC); | |
3902 | if (!trans) | |
3903 | return -ENOMEM; | |
3904 | ||
3905 | if (!set->ops->deactivate_one(ctx->net, set, elem->priv)) { | |
3906 | err = -ENOENT; | |
3907 | goto err1; | |
3908 | } | |
b2c11e4b | 3909 | set->ndeact++; |
8411b644 | 3910 | |
de70185d PNA |
3911 | nft_trans_elem_set(trans) = set; |
3912 | nft_trans_elem(trans) = *elem; | |
8411b644 PNA |
3913 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
3914 | ||
3915 | return 0; | |
3916 | err1: | |
3917 | kfree(trans); | |
3918 | return err; | |
3919 | } | |
3920 | ||
633c9a84 PNA |
3921 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
3922 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
3923 | const struct nlattr * const nla[]) |
3924 | { | |
f2a6d766 | 3925 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3926 | const struct nlattr *attr; |
3927 | struct nft_set *set; | |
3928 | struct nft_ctx ctx; | |
60319eb1 | 3929 | int rem, err = 0; |
20a69341 | 3930 | |
f2a6d766 | 3931 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3932 | if (err < 0) |
3933 | return err; | |
3934 | ||
37a9cc52 PNA |
3935 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3936 | genmask); | |
20a69341 PM |
3937 | if (IS_ERR(set)) |
3938 | return PTR_ERR(set); | |
3939 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
3940 | return -EBUSY; | |
3941 | ||
8411b644 PNA |
3942 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) { |
3943 | struct nft_set_dump_args args = { | |
3944 | .iter = { | |
3945 | .genmask = genmask, | |
3946 | .fn = nft_flush_set, | |
3947 | }, | |
3948 | }; | |
3949 | set->ops->walk(&ctx, set, &args.iter); | |
3950 | ||
3951 | return args.iter.err; | |
3952 | } | |
3953 | ||
20a69341 PM |
3954 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
3955 | err = nft_del_setelem(&ctx, set, attr); | |
3956 | if (err < 0) | |
60319eb1 | 3957 | break; |
4fefee57 | 3958 | |
3dd0673a | 3959 | set->ndeact++; |
20a69341 | 3960 | } |
60319eb1 | 3961 | return err; |
20a69341 PM |
3962 | } |
3963 | ||
cfed7e1b PM |
3964 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
3965 | { | |
3966 | struct nft_set_gc_batch *gcb; | |
3967 | unsigned int i; | |
3968 | ||
3969 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
3970 | for (i = 0; i < gcb->head.cnt; i++) | |
61f9e292 | 3971 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); |
cfed7e1b PM |
3972 | kfree(gcb); |
3973 | } | |
3974 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
3975 | ||
3976 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
3977 | gfp_t gfp) | |
3978 | { | |
3979 | struct nft_set_gc_batch *gcb; | |
3980 | ||
3981 | gcb = kzalloc(sizeof(*gcb), gfp); | |
3982 | if (gcb == NULL) | |
3983 | return gcb; | |
3984 | gcb->head.set = set; | |
3985 | return gcb; | |
3986 | } | |
3987 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
3988 | ||
e5009240 PNA |
3989 | /* |
3990 | * Stateful objects | |
3991 | */ | |
3992 | ||
3993 | /** | |
3994 | * nft_register_obj- register nf_tables stateful object type | |
3995 | * @obj: object type | |
3996 | * | |
3997 | * Registers the object type for use with nf_tables. Returns zero on | |
3998 | * success or a negative errno code otherwise. | |
3999 | */ | |
4000 | int nft_register_obj(struct nft_object_type *obj_type) | |
4001 | { | |
4002 | if (obj_type->type == NFT_OBJECT_UNSPEC) | |
4003 | return -EINVAL; | |
4004 | ||
4005 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4006 | list_add_rcu(&obj_type->list, &nf_tables_objects); | |
4007 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4008 | return 0; | |
4009 | } | |
4010 | EXPORT_SYMBOL_GPL(nft_register_obj); | |
4011 | ||
4012 | /** | |
4013 | * nft_unregister_obj - unregister nf_tables object type | |
4014 | * @obj: object type | |
4015 | * | |
4016 | * Unregisters the object type for use with nf_tables. | |
4017 | */ | |
4018 | void nft_unregister_obj(struct nft_object_type *obj_type) | |
4019 | { | |
4020 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4021 | list_del_rcu(&obj_type->list); | |
4022 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4023 | } | |
4024 | EXPORT_SYMBOL_GPL(nft_unregister_obj); | |
4025 | ||
4026 | struct nft_object *nf_tables_obj_lookup(const struct nft_table *table, | |
4027 | const struct nlattr *nla, | |
4028 | u32 objtype, u8 genmask) | |
4029 | { | |
4030 | struct nft_object *obj; | |
4031 | ||
4032 | list_for_each_entry(obj, &table->objects, list) { | |
4033 | if (!nla_strcmp(nla, obj->name) && | |
4034 | objtype == obj->type->type && | |
4035 | nft_active_genmask(obj, genmask)) | |
4036 | return obj; | |
4037 | } | |
4038 | return ERR_PTR(-ENOENT); | |
4039 | } | |
4040 | EXPORT_SYMBOL_GPL(nf_tables_obj_lookup); | |
4041 | ||
4042 | static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { | |
b2fbd044 LZ |
4043 | [NFTA_OBJ_TABLE] = { .type = NLA_STRING, |
4044 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
4045 | [NFTA_OBJ_NAME] = { .type = NLA_STRING, | |
4046 | .len = NFT_OBJ_MAXNAMELEN - 1 }, | |
e5009240 PNA |
4047 | [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, |
4048 | [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, | |
4049 | }; | |
4050 | ||
4051 | static struct nft_object *nft_obj_init(const struct nft_object_type *type, | |
4052 | const struct nlattr *attr) | |
4053 | { | |
4054 | struct nlattr *tb[type->maxattr + 1]; | |
4055 | struct nft_object *obj; | |
4056 | int err; | |
4057 | ||
4058 | if (attr) { | |
4059 | err = nla_parse_nested(tb, type->maxattr, attr, type->policy); | |
4060 | if (err < 0) | |
4061 | goto err1; | |
4062 | } else { | |
4063 | memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); | |
4064 | } | |
4065 | ||
4066 | err = -ENOMEM; | |
4067 | obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL); | |
4068 | if (obj == NULL) | |
4069 | goto err1; | |
4070 | ||
4071 | err = type->init((const struct nlattr * const *)tb, obj); | |
4072 | if (err < 0) | |
4073 | goto err2; | |
4074 | ||
4075 | obj->type = type; | |
4076 | return obj; | |
4077 | err2: | |
4078 | kfree(obj); | |
4079 | err1: | |
4080 | return ERR_PTR(err); | |
4081 | } | |
4082 | ||
4083 | static int nft_object_dump(struct sk_buff *skb, unsigned int attr, | |
43da04a5 | 4084 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4085 | { |
4086 | struct nlattr *nest; | |
4087 | ||
4088 | nest = nla_nest_start(skb, attr); | |
4089 | if (!nest) | |
4090 | goto nla_put_failure; | |
43da04a5 | 4091 | if (obj->type->dump(skb, obj, reset) < 0) |
e5009240 PNA |
4092 | goto nla_put_failure; |
4093 | nla_nest_end(skb, nest); | |
4094 | return 0; | |
4095 | ||
4096 | nla_put_failure: | |
4097 | return -1; | |
4098 | } | |
4099 | ||
4100 | static const struct nft_object_type *__nft_obj_type_get(u32 objtype) | |
4101 | { | |
4102 | const struct nft_object_type *type; | |
4103 | ||
4104 | list_for_each_entry(type, &nf_tables_objects, list) { | |
4105 | if (objtype == type->type) | |
4106 | return type; | |
4107 | } | |
4108 | return NULL; | |
4109 | } | |
4110 | ||
4111 | static const struct nft_object_type *nft_obj_type_get(u32 objtype) | |
4112 | { | |
4113 | const struct nft_object_type *type; | |
4114 | ||
4115 | type = __nft_obj_type_get(objtype); | |
4116 | if (type != NULL && try_module_get(type->owner)) | |
4117 | return type; | |
4118 | ||
4119 | #ifdef CONFIG_MODULES | |
4120 | if (type == NULL) { | |
4121 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4122 | request_module("nft-obj-%u", objtype); | |
4123 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4124 | if (__nft_obj_type_get(objtype)) | |
4125 | return ERR_PTR(-EAGAIN); | |
4126 | } | |
4127 | #endif | |
4128 | return ERR_PTR(-ENOENT); | |
4129 | } | |
4130 | ||
4131 | static int nf_tables_newobj(struct net *net, struct sock *nlsk, | |
4132 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
4133 | const struct nlattr * const nla[]) | |
4134 | { | |
4135 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4136 | const struct nft_object_type *type; | |
4137 | u8 genmask = nft_genmask_next(net); | |
4138 | int family = nfmsg->nfgen_family; | |
4139 | struct nft_af_info *afi; | |
4140 | struct nft_table *table; | |
4141 | struct nft_object *obj; | |
4142 | struct nft_ctx ctx; | |
4143 | u32 objtype; | |
4144 | int err; | |
4145 | ||
4146 | if (!nla[NFTA_OBJ_TYPE] || | |
4147 | !nla[NFTA_OBJ_NAME] || | |
4148 | !nla[NFTA_OBJ_DATA]) | |
4149 | return -EINVAL; | |
4150 | ||
4151 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4152 | if (IS_ERR(afi)) | |
4153 | return PTR_ERR(afi); | |
4154 | ||
4155 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4156 | if (IS_ERR(table)) | |
4157 | return PTR_ERR(table); | |
4158 | ||
4159 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4160 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4161 | if (IS_ERR(obj)) { | |
4162 | err = PTR_ERR(obj); | |
4163 | if (err != -ENOENT) | |
4164 | return err; | |
4165 | ||
4166 | obj = NULL; | |
4167 | } | |
4168 | ||
4169 | if (obj != NULL) { | |
4170 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
4171 | return -EEXIST; | |
4172 | ||
4173 | return 0; | |
4174 | } | |
4175 | ||
4176 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4177 | ||
4178 | type = nft_obj_type_get(objtype); | |
4179 | if (IS_ERR(type)) | |
4180 | return PTR_ERR(type); | |
4181 | ||
4182 | obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]); | |
4183 | if (IS_ERR(obj)) { | |
4184 | err = PTR_ERR(obj); | |
4185 | goto err1; | |
4186 | } | |
18965317 | 4187 | obj->table = table; |
e5009240 PNA |
4188 | nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN); |
4189 | ||
4190 | err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); | |
4191 | if (err < 0) | |
4192 | goto err2; | |
4193 | ||
4194 | list_add_tail_rcu(&obj->list, &table->objects); | |
4195 | table->use++; | |
4196 | return 0; | |
4197 | err2: | |
4198 | if (obj->type->destroy) | |
4199 | obj->type->destroy(obj); | |
4200 | kfree(obj); | |
4201 | err1: | |
4202 | module_put(type->owner); | |
4203 | return err; | |
4204 | } | |
4205 | ||
4206 | static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, | |
4207 | u32 portid, u32 seq, int event, u32 flags, | |
4208 | int family, const struct nft_table *table, | |
43da04a5 | 4209 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4210 | { |
4211 | struct nfgenmsg *nfmsg; | |
4212 | struct nlmsghdr *nlh; | |
4213 | ||
4214 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
4215 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
4216 | if (nlh == NULL) | |
4217 | goto nla_put_failure; | |
4218 | ||
4219 | nfmsg = nlmsg_data(nlh); | |
4220 | nfmsg->nfgen_family = family; | |
4221 | nfmsg->version = NFNETLINK_V0; | |
4222 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4223 | ||
4224 | if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || | |
4225 | nla_put_string(skb, NFTA_OBJ_NAME, obj->name) || | |
4226 | nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) || | |
4227 | nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || | |
43da04a5 | 4228 | nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset)) |
e5009240 PNA |
4229 | goto nla_put_failure; |
4230 | ||
4231 | nlmsg_end(skb, nlh); | |
4232 | return 0; | |
4233 | ||
4234 | nla_put_failure: | |
4235 | nlmsg_trim(skb, nlh); | |
4236 | return -1; | |
4237 | } | |
4238 | ||
a9fea2a3 PNA |
4239 | struct nft_obj_filter { |
4240 | char table[NFT_OBJ_MAXNAMELEN]; | |
4241 | u32 type; | |
4242 | }; | |
4243 | ||
e5009240 PNA |
4244 | static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) |
4245 | { | |
4246 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
4247 | const struct nft_af_info *afi; | |
4248 | const struct nft_table *table; | |
e5009240 | 4249 | unsigned int idx = 0, s_idx = cb->args[0]; |
a9fea2a3 | 4250 | struct nft_obj_filter *filter = cb->data; |
e5009240 PNA |
4251 | struct net *net = sock_net(skb->sk); |
4252 | int family = nfmsg->nfgen_family; | |
43da04a5 PNA |
4253 | struct nft_object *obj; |
4254 | bool reset = false; | |
4255 | ||
4256 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) | |
4257 | reset = true; | |
e5009240 PNA |
4258 | |
4259 | rcu_read_lock(); | |
4260 | cb->seq = net->nft.base_seq; | |
4261 | ||
4262 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
4263 | if (family != NFPROTO_UNSPEC && family != afi->family) | |
4264 | continue; | |
4265 | ||
4266 | list_for_each_entry_rcu(table, &afi->tables, list) { | |
4267 | list_for_each_entry_rcu(obj, &table->objects, list) { | |
4268 | if (!nft_is_active(net, obj)) | |
4269 | goto cont; | |
4270 | if (idx < s_idx) | |
4271 | goto cont; | |
4272 | if (idx > s_idx) | |
4273 | memset(&cb->args[1], 0, | |
4274 | sizeof(cb->args) - sizeof(cb->args[0])); | |
d21e540b | 4275 | if (filter && filter->table[0] && |
a9fea2a3 PNA |
4276 | strcmp(filter->table, table->name)) |
4277 | goto cont; | |
d21e540b LZ |
4278 | if (filter && |
4279 | filter->type != NFT_OBJECT_UNSPEC && | |
a9fea2a3 PNA |
4280 | obj->type->type != filter->type) |
4281 | goto cont; | |
4282 | ||
e5009240 PNA |
4283 | if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, |
4284 | cb->nlh->nlmsg_seq, | |
4285 | NFT_MSG_NEWOBJ, | |
4286 | NLM_F_MULTI | NLM_F_APPEND, | |
43da04a5 | 4287 | afi->family, table, obj, reset) < 0) |
e5009240 PNA |
4288 | goto done; |
4289 | ||
4290 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
4291 | cont: | |
4292 | idx++; | |
4293 | } | |
4294 | } | |
4295 | } | |
4296 | done: | |
4297 | rcu_read_unlock(); | |
4298 | ||
4299 | cb->args[0] = idx; | |
4300 | return skb->len; | |
4301 | } | |
4302 | ||
a9fea2a3 PNA |
4303 | static int nf_tables_dump_obj_done(struct netlink_callback *cb) |
4304 | { | |
4305 | kfree(cb->data); | |
4306 | ||
4307 | return 0; | |
4308 | } | |
4309 | ||
4310 | static struct nft_obj_filter * | |
4311 | nft_obj_filter_alloc(const struct nlattr * const nla[]) | |
4312 | { | |
4313 | struct nft_obj_filter *filter; | |
4314 | ||
4315 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); | |
4316 | if (!filter) | |
4317 | return ERR_PTR(-ENOMEM); | |
4318 | ||
4319 | if (nla[NFTA_OBJ_TABLE]) | |
4320 | nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE], | |
4321 | NFT_TABLE_MAXNAMELEN); | |
4322 | if (nla[NFTA_OBJ_TYPE]) | |
4323 | filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4324 | ||
4325 | return filter; | |
4326 | } | |
4327 | ||
e5009240 PNA |
4328 | static int nf_tables_getobj(struct net *net, struct sock *nlsk, |
4329 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
4330 | const struct nlattr * const nla[]) | |
4331 | { | |
4332 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4333 | u8 genmask = nft_genmask_cur(net); | |
4334 | int family = nfmsg->nfgen_family; | |
4335 | const struct nft_af_info *afi; | |
4336 | const struct nft_table *table; | |
4337 | struct nft_object *obj; | |
4338 | struct sk_buff *skb2; | |
43da04a5 | 4339 | bool reset = false; |
e5009240 PNA |
4340 | u32 objtype; |
4341 | int err; | |
4342 | ||
4343 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
4344 | struct netlink_dump_control c = { | |
4345 | .dump = nf_tables_dump_obj, | |
a9fea2a3 | 4346 | .done = nf_tables_dump_obj_done, |
e5009240 | 4347 | }; |
a9fea2a3 PNA |
4348 | |
4349 | if (nla[NFTA_OBJ_TABLE] || | |
4350 | nla[NFTA_OBJ_TYPE]) { | |
4351 | struct nft_obj_filter *filter; | |
4352 | ||
4353 | filter = nft_obj_filter_alloc(nla); | |
4354 | if (IS_ERR(filter)) | |
4355 | return -ENOMEM; | |
4356 | ||
4357 | c.data = filter; | |
4358 | } | |
e5009240 PNA |
4359 | return netlink_dump_start(nlsk, skb, nlh, &c); |
4360 | } | |
4361 | ||
4362 | if (!nla[NFTA_OBJ_NAME] || | |
4363 | !nla[NFTA_OBJ_TYPE]) | |
4364 | return -EINVAL; | |
4365 | ||
4366 | afi = nf_tables_afinfo_lookup(net, family, false); | |
4367 | if (IS_ERR(afi)) | |
4368 | return PTR_ERR(afi); | |
4369 | ||
4370 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4371 | if (IS_ERR(table)) | |
4372 | return PTR_ERR(table); | |
4373 | ||
4374 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4375 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4376 | if (IS_ERR(obj)) | |
4377 | return PTR_ERR(obj); | |
4378 | ||
4379 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4380 | if (!skb2) | |
4381 | return -ENOMEM; | |
4382 | ||
43da04a5 PNA |
4383 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) |
4384 | reset = true; | |
4385 | ||
e5009240 PNA |
4386 | err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, |
4387 | nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, | |
43da04a5 | 4388 | family, table, obj, reset); |
e5009240 PNA |
4389 | if (err < 0) |
4390 | goto err; | |
4391 | ||
4392 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4393 | err: | |
4394 | kfree_skb(skb2); | |
4395 | return err; | |
4396 | ||
4397 | return 0; | |
4398 | } | |
4399 | ||
4400 | static void nft_obj_destroy(struct nft_object *obj) | |
4401 | { | |
4402 | if (obj->type->destroy) | |
4403 | obj->type->destroy(obj); | |
4404 | ||
4405 | module_put(obj->type->owner); | |
4406 | kfree(obj); | |
4407 | } | |
4408 | ||
4409 | static int nf_tables_delobj(struct net *net, struct sock *nlsk, | |
4410 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
4411 | const struct nlattr * const nla[]) | |
4412 | { | |
4413 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4414 | u8 genmask = nft_genmask_next(net); | |
4415 | int family = nfmsg->nfgen_family; | |
4416 | struct nft_af_info *afi; | |
4417 | struct nft_table *table; | |
4418 | struct nft_object *obj; | |
4419 | struct nft_ctx ctx; | |
4420 | u32 objtype; | |
4421 | ||
4422 | if (!nla[NFTA_OBJ_TYPE] || | |
4423 | !nla[NFTA_OBJ_NAME]) | |
4424 | return -EINVAL; | |
4425 | ||
4426 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4427 | if (IS_ERR(afi)) | |
4428 | return PTR_ERR(afi); | |
4429 | ||
4430 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4431 | if (IS_ERR(table)) | |
4432 | return PTR_ERR(table); | |
4433 | ||
4434 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4435 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4436 | if (IS_ERR(obj)) | |
4437 | return PTR_ERR(obj); | |
4438 | if (obj->use > 0) | |
4439 | return -EBUSY; | |
4440 | ||
4441 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4442 | ||
4443 | return nft_delobj(&ctx, obj); | |
4444 | } | |
4445 | ||
2599e989 PNA |
4446 | int nft_obj_notify(struct net *net, struct nft_table *table, |
4447 | struct nft_object *obj, u32 portid, u32 seq, int event, | |
4448 | int family, int report, gfp_t gfp) | |
e5009240 PNA |
4449 | { |
4450 | struct sk_buff *skb; | |
4451 | int err; | |
4452 | ||
2599e989 PNA |
4453 | if (!report && |
4454 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
e5009240 PNA |
4455 | return 0; |
4456 | ||
4457 | err = -ENOBUFS; | |
2599e989 | 4458 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp); |
e5009240 PNA |
4459 | if (skb == NULL) |
4460 | goto err; | |
4461 | ||
2599e989 PNA |
4462 | err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family, |
4463 | table, obj, false); | |
e5009240 PNA |
4464 | if (err < 0) { |
4465 | kfree_skb(skb); | |
4466 | goto err; | |
4467 | } | |
4468 | ||
2599e989 | 4469 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp); |
e5009240 PNA |
4470 | err: |
4471 | if (err < 0) { | |
2599e989 | 4472 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); |
e5009240 PNA |
4473 | } |
4474 | return err; | |
4475 | } | |
2599e989 PNA |
4476 | EXPORT_SYMBOL_GPL(nft_obj_notify); |
4477 | ||
4478 | static int nf_tables_obj_notify(const struct nft_ctx *ctx, | |
4479 | struct nft_object *obj, int event) | |
4480 | { | |
4481 | return nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, | |
4482 | ctx->seq, event, ctx->afi->family, ctx->report, | |
4483 | GFP_KERNEL); | |
4484 | } | |
e5009240 | 4485 | |
84d7fce6 PNA |
4486 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
4487 | u32 portid, u32 seq) | |
4488 | { | |
4489 | struct nlmsghdr *nlh; | |
4490 | struct nfgenmsg *nfmsg; | |
4491 | int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN; | |
4492 | ||
4493 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
4494 | if (nlh == NULL) | |
4495 | goto nla_put_failure; | |
4496 | ||
4497 | nfmsg = nlmsg_data(nlh); | |
4498 | nfmsg->nfgen_family = AF_UNSPEC; | |
4499 | nfmsg->version = NFNETLINK_V0; | |
4500 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4501 | ||
4502 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq))) | |
4503 | goto nla_put_failure; | |
4504 | ||
053c095a JB |
4505 | nlmsg_end(skb, nlh); |
4506 | return 0; | |
84d7fce6 PNA |
4507 | |
4508 | nla_put_failure: | |
4509 | nlmsg_trim(skb, nlh); | |
4510 | return -EMSGSIZE; | |
4511 | } | |
4512 | ||
4513 | static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event) | |
4514 | { | |
4515 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
4516 | struct sk_buff *skb2; | |
4517 | int err; | |
4518 | ||
4519 | if (nlmsg_report(nlh) && | |
4520 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
4521 | return 0; | |
4522 | ||
4523 | err = -ENOBUFS; | |
4524 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
4525 | if (skb2 == NULL) | |
4526 | goto err; | |
4527 | ||
4528 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
4529 | nlh->nlmsg_seq); | |
4530 | if (err < 0) { | |
4531 | kfree_skb(skb2); | |
4532 | goto err; | |
4533 | } | |
4534 | ||
4535 | err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, | |
4536 | NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL); | |
4537 | err: | |
4538 | if (err < 0) { | |
4539 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, | |
4540 | err); | |
4541 | } | |
4542 | return err; | |
4543 | } | |
4544 | ||
7b8002a1 PNA |
4545 | static int nf_tables_getgen(struct net *net, struct sock *nlsk, |
4546 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
84d7fce6 PNA |
4547 | const struct nlattr * const nla[]) |
4548 | { | |
84d7fce6 PNA |
4549 | struct sk_buff *skb2; |
4550 | int err; | |
4551 | ||
4552 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4553 | if (skb2 == NULL) | |
4554 | return -ENOMEM; | |
4555 | ||
4556 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
4557 | nlh->nlmsg_seq); | |
4558 | if (err < 0) | |
4559 | goto err; | |
4560 | ||
4561 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4562 | err: | |
4563 | kfree_skb(skb2); | |
4564 | return err; | |
4565 | } | |
4566 | ||
96518518 PM |
4567 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
4568 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 4569 | .call_batch = nf_tables_newtable, |
96518518 PM |
4570 | .attr_count = NFTA_TABLE_MAX, |
4571 | .policy = nft_table_policy, | |
4572 | }, | |
4573 | [NFT_MSG_GETTABLE] = { | |
4574 | .call = nf_tables_gettable, | |
4575 | .attr_count = NFTA_TABLE_MAX, | |
4576 | .policy = nft_table_policy, | |
4577 | }, | |
4578 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 4579 | .call_batch = nf_tables_deltable, |
96518518 PM |
4580 | .attr_count = NFTA_TABLE_MAX, |
4581 | .policy = nft_table_policy, | |
4582 | }, | |
4583 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 4584 | .call_batch = nf_tables_newchain, |
96518518 PM |
4585 | .attr_count = NFTA_CHAIN_MAX, |
4586 | .policy = nft_chain_policy, | |
4587 | }, | |
4588 | [NFT_MSG_GETCHAIN] = { | |
4589 | .call = nf_tables_getchain, | |
4590 | .attr_count = NFTA_CHAIN_MAX, | |
4591 | .policy = nft_chain_policy, | |
4592 | }, | |
4593 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 4594 | .call_batch = nf_tables_delchain, |
96518518 PM |
4595 | .attr_count = NFTA_CHAIN_MAX, |
4596 | .policy = nft_chain_policy, | |
4597 | }, | |
4598 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 4599 | .call_batch = nf_tables_newrule, |
96518518 PM |
4600 | .attr_count = NFTA_RULE_MAX, |
4601 | .policy = nft_rule_policy, | |
4602 | }, | |
4603 | [NFT_MSG_GETRULE] = { | |
4604 | .call = nf_tables_getrule, | |
4605 | .attr_count = NFTA_RULE_MAX, | |
4606 | .policy = nft_rule_policy, | |
4607 | }, | |
4608 | [NFT_MSG_DELRULE] = { | |
0628b123 | 4609 | .call_batch = nf_tables_delrule, |
96518518 PM |
4610 | .attr_count = NFTA_RULE_MAX, |
4611 | .policy = nft_rule_policy, | |
4612 | }, | |
20a69341 | 4613 | [NFT_MSG_NEWSET] = { |
958bee14 | 4614 | .call_batch = nf_tables_newset, |
20a69341 PM |
4615 | .attr_count = NFTA_SET_MAX, |
4616 | .policy = nft_set_policy, | |
4617 | }, | |
4618 | [NFT_MSG_GETSET] = { | |
4619 | .call = nf_tables_getset, | |
4620 | .attr_count = NFTA_SET_MAX, | |
4621 | .policy = nft_set_policy, | |
4622 | }, | |
4623 | [NFT_MSG_DELSET] = { | |
958bee14 | 4624 | .call_batch = nf_tables_delset, |
20a69341 PM |
4625 | .attr_count = NFTA_SET_MAX, |
4626 | .policy = nft_set_policy, | |
4627 | }, | |
4628 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 4629 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
4630 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
4631 | .policy = nft_set_elem_list_policy, | |
4632 | }, | |
4633 | [NFT_MSG_GETSETELEM] = { | |
4634 | .call = nf_tables_getsetelem, | |
4635 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
4636 | .policy = nft_set_elem_list_policy, | |
4637 | }, | |
4638 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 4639 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
4640 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
4641 | .policy = nft_set_elem_list_policy, | |
4642 | }, | |
84d7fce6 PNA |
4643 | [NFT_MSG_GETGEN] = { |
4644 | .call = nf_tables_getgen, | |
4645 | }, | |
e5009240 PNA |
4646 | [NFT_MSG_NEWOBJ] = { |
4647 | .call_batch = nf_tables_newobj, | |
4648 | .attr_count = NFTA_OBJ_MAX, | |
4649 | .policy = nft_obj_policy, | |
4650 | }, | |
4651 | [NFT_MSG_GETOBJ] = { | |
4652 | .call = nf_tables_getobj, | |
4653 | .attr_count = NFTA_OBJ_MAX, | |
4654 | .policy = nft_obj_policy, | |
4655 | }, | |
4656 | [NFT_MSG_DELOBJ] = { | |
4657 | .call_batch = nf_tables_delobj, | |
4658 | .attr_count = NFTA_OBJ_MAX, | |
4659 | .policy = nft_obj_policy, | |
4660 | }, | |
43da04a5 PNA |
4661 | [NFT_MSG_GETOBJ_RESET] = { |
4662 | .call = nf_tables_getobj, | |
4663 | .attr_count = NFTA_OBJ_MAX, | |
4664 | .policy = nft_obj_policy, | |
4665 | }, | |
96518518 PM |
4666 | }; |
4667 | ||
91c7b38d PNA |
4668 | static void nft_chain_commit_update(struct nft_trans *trans) |
4669 | { | |
4670 | struct nft_base_chain *basechain; | |
4671 | ||
4672 | if (nft_trans_chain_name(trans)[0]) | |
4673 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); | |
4674 | ||
4675 | if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN)) | |
4676 | return; | |
4677 | ||
4678 | basechain = nft_base_chain(trans->ctx.chain); | |
4679 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
4680 | ||
4681 | switch (nft_trans_chain_policy(trans)) { | |
4682 | case NF_DROP: | |
4683 | case NF_ACCEPT: | |
4684 | basechain->policy = nft_trans_chain_policy(trans); | |
4685 | break; | |
4686 | } | |
4687 | } | |
4688 | ||
b326dd37 | 4689 | static void nf_tables_commit_release(struct nft_trans *trans) |
c7c32e72 | 4690 | { |
c7c32e72 PNA |
4691 | switch (trans->msg_type) { |
4692 | case NFT_MSG_DELTABLE: | |
4693 | nf_tables_table_destroy(&trans->ctx); | |
4694 | break; | |
4695 | case NFT_MSG_DELCHAIN: | |
4696 | nf_tables_chain_destroy(trans->ctx.chain); | |
4697 | break; | |
4698 | case NFT_MSG_DELRULE: | |
4699 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
4700 | break; | |
4701 | case NFT_MSG_DELSET: | |
4702 | nft_set_destroy(nft_trans_set(trans)); | |
4703 | break; | |
61edafbb PM |
4704 | case NFT_MSG_DELSETELEM: |
4705 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 4706 | nft_trans_elem(trans).priv, true); |
61edafbb | 4707 | break; |
e5009240 PNA |
4708 | case NFT_MSG_DELOBJ: |
4709 | nft_obj_destroy(nft_trans_obj(trans)); | |
4710 | break; | |
c7c32e72 PNA |
4711 | } |
4712 | kfree(trans); | |
4713 | } | |
4714 | ||
5913beaf | 4715 | static int nf_tables_commit(struct net *net, struct sk_buff *skb) |
37082f93 | 4716 | { |
37082f93 | 4717 | struct nft_trans *trans, *next; |
a3716e70 | 4718 | struct nft_trans_elem *te; |
37082f93 PNA |
4719 | |
4720 | /* Bump generation counter, invalidate any dump in progress */ | |
38e029f1 | 4721 | while (++net->nft.base_seq == 0); |
37082f93 PNA |
4722 | |
4723 | /* A new generation has just started */ | |
ea4bd995 | 4724 | net->nft.gencursor = nft_gencursor_next(net); |
37082f93 PNA |
4725 | |
4726 | /* Make sure all packets have left the previous generation before | |
4727 | * purging old rules. | |
4728 | */ | |
4729 | synchronize_rcu(); | |
4730 | ||
4731 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 4732 | switch (trans->msg_type) { |
55dd6f93 PNA |
4733 | case NFT_MSG_NEWTABLE: |
4734 | if (nft_trans_table_update(trans)) { | |
4735 | if (!nft_trans_table_enable(trans)) { | |
664b0f8c PNA |
4736 | nf_tables_table_disable(net, |
4737 | trans->ctx.afi, | |
55dd6f93 PNA |
4738 | trans->ctx.table); |
4739 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
4740 | } | |
4741 | } else { | |
f2a6d766 | 4742 | nft_clear(net, trans->ctx.table); |
55dd6f93 | 4743 | } |
35151d84 | 4744 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
4745 | nft_trans_destroy(trans); |
4746 | break; | |
4747 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 4748 | list_del_rcu(&trans->ctx.table->list); |
35151d84 | 4749 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 4750 | break; |
91c7b38d PNA |
4751 | case NFT_MSG_NEWCHAIN: |
4752 | if (nft_trans_chain_update(trans)) | |
4753 | nft_chain_commit_update(trans); | |
4fefee57 | 4754 | else |
664b0f8c | 4755 | nft_clear(net, trans->ctx.chain); |
4fefee57 | 4756 | |
35151d84 | 4757 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
4758 | nft_trans_destroy(trans); |
4759 | break; | |
4760 | case NFT_MSG_DELCHAIN: | |
664b0f8c | 4761 | list_del_rcu(&trans->ctx.chain->list); |
35151d84 | 4762 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
82bec71d PNA |
4763 | nf_tables_unregister_hooks(trans->ctx.net, |
4764 | trans->ctx.table, | |
c5598794 AB |
4765 | trans->ctx.chain, |
4766 | trans->ctx.afi->nops); | |
91c7b38d | 4767 | break; |
b380e5c7 | 4768 | case NFT_MSG_NEWRULE: |
889f7ee7 | 4769 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
35151d84 | 4770 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 4771 | nft_trans_rule(trans), |
35151d84 | 4772 | NFT_MSG_NEWRULE); |
37082f93 | 4773 | nft_trans_destroy(trans); |
b380e5c7 PNA |
4774 | break; |
4775 | case NFT_MSG_DELRULE: | |
4776 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
4777 | nf_tables_rule_notify(&trans->ctx, |
4778 | nft_trans_rule(trans), | |
4779 | NFT_MSG_DELRULE); | |
b380e5c7 | 4780 | break; |
958bee14 | 4781 | case NFT_MSG_NEWSET: |
37a9cc52 | 4782 | nft_clear(net, nft_trans_set(trans)); |
4fefee57 PNA |
4783 | /* This avoids hitting -EBUSY when deleting the table |
4784 | * from the transaction. | |
4785 | */ | |
4786 | if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS && | |
4787 | !list_empty(&nft_trans_set(trans)->bindings)) | |
4788 | trans->ctx.table->use--; | |
4789 | ||
958bee14 | 4790 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 4791 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
4792 | nft_trans_destroy(trans); |
4793 | break; | |
4794 | case NFT_MSG_DELSET: | |
37a9cc52 | 4795 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 | 4796 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 4797 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 4798 | break; |
60319eb1 | 4799 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
4800 | te = (struct nft_trans_elem *)trans->data; |
4801 | ||
42a55769 | 4802 | te->set->ops->activate(net, te->set, &te->elem); |
cc02e457 PM |
4803 | nf_tables_setelem_notify(&trans->ctx, te->set, |
4804 | &te->elem, | |
60319eb1 PNA |
4805 | NFT_MSG_NEWSETELEM, 0); |
4806 | nft_trans_destroy(trans); | |
4807 | break; | |
4808 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 4809 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 4810 | |
a3716e70 PNA |
4811 | nf_tables_setelem_notify(&trans->ctx, te->set, |
4812 | &te->elem, | |
60319eb1 | 4813 | NFT_MSG_DELSETELEM, 0); |
02263db0 | 4814 | te->set->ops->remove(te->set, &te->elem); |
3dd0673a PM |
4815 | atomic_dec(&te->set->nelems); |
4816 | te->set->ndeact--; | |
60319eb1 | 4817 | break; |
e5009240 PNA |
4818 | case NFT_MSG_NEWOBJ: |
4819 | nft_clear(net, nft_trans_obj(trans)); | |
4820 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
4821 | NFT_MSG_NEWOBJ); | |
4822 | nft_trans_destroy(trans); | |
4823 | break; | |
4824 | case NFT_MSG_DELOBJ: | |
4825 | list_del_rcu(&nft_trans_obj(trans)->list); | |
4826 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
4827 | NFT_MSG_DELOBJ); | |
4828 | break; | |
37082f93 | 4829 | } |
37082f93 PNA |
4830 | } |
4831 | ||
b326dd37 PNA |
4832 | synchronize_rcu(); |
4833 | ||
37082f93 | 4834 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 | 4835 | list_del(&trans->list); |
b326dd37 | 4836 | nf_tables_commit_release(trans); |
37082f93 | 4837 | } |
84d7fce6 PNA |
4838 | |
4839 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); | |
37082f93 PNA |
4840 | |
4841 | return 0; | |
4842 | } | |
4843 | ||
b326dd37 | 4844 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 4845 | { |
c7c32e72 PNA |
4846 | switch (trans->msg_type) { |
4847 | case NFT_MSG_NEWTABLE: | |
4848 | nf_tables_table_destroy(&trans->ctx); | |
4849 | break; | |
4850 | case NFT_MSG_NEWCHAIN: | |
4851 | nf_tables_chain_destroy(trans->ctx.chain); | |
4852 | break; | |
4853 | case NFT_MSG_NEWRULE: | |
4854 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
4855 | break; | |
4856 | case NFT_MSG_NEWSET: | |
4857 | nft_set_destroy(nft_trans_set(trans)); | |
4858 | break; | |
61edafbb PM |
4859 | case NFT_MSG_NEWSETELEM: |
4860 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 4861 | nft_trans_elem(trans).priv, true); |
61edafbb | 4862 | break; |
e5009240 PNA |
4863 | case NFT_MSG_NEWOBJ: |
4864 | nft_obj_destroy(nft_trans_obj(trans)); | |
4865 | break; | |
c7c32e72 PNA |
4866 | } |
4867 | kfree(trans); | |
4868 | } | |
4869 | ||
5913beaf | 4870 | static int nf_tables_abort(struct net *net, struct sk_buff *skb) |
37082f93 | 4871 | { |
37082f93 | 4872 | struct nft_trans *trans, *next; |
02263db0 | 4873 | struct nft_trans_elem *te; |
37082f93 | 4874 | |
a907e36d XL |
4875 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
4876 | list) { | |
b380e5c7 | 4877 | switch (trans->msg_type) { |
55dd6f93 PNA |
4878 | case NFT_MSG_NEWTABLE: |
4879 | if (nft_trans_table_update(trans)) { | |
4880 | if (nft_trans_table_enable(trans)) { | |
664b0f8c PNA |
4881 | nf_tables_table_disable(net, |
4882 | trans->ctx.afi, | |
55dd6f93 PNA |
4883 | trans->ctx.table); |
4884 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
4885 | } | |
4886 | nft_trans_destroy(trans); | |
4887 | } else { | |
e688a7f8 | 4888 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
4889 | } |
4890 | break; | |
4891 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 4892 | nft_clear(trans->ctx.net, trans->ctx.table); |
55dd6f93 PNA |
4893 | nft_trans_destroy(trans); |
4894 | break; | |
91c7b38d PNA |
4895 | case NFT_MSG_NEWCHAIN: |
4896 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 4897 | free_percpu(nft_trans_chain_stats(trans)); |
91c7b38d PNA |
4898 | |
4899 | nft_trans_destroy(trans); | |
4900 | } else { | |
4fefee57 | 4901 | trans->ctx.table->use--; |
e688a7f8 | 4902 | list_del_rcu(&trans->ctx.chain->list); |
82bec71d PNA |
4903 | nf_tables_unregister_hooks(trans->ctx.net, |
4904 | trans->ctx.table, | |
c5598794 AB |
4905 | trans->ctx.chain, |
4906 | trans->ctx.afi->nops); | |
91c7b38d PNA |
4907 | } |
4908 | break; | |
4909 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 4910 | trans->ctx.table->use++; |
664b0f8c | 4911 | nft_clear(trans->ctx.net, trans->ctx.chain); |
91c7b38d PNA |
4912 | nft_trans_destroy(trans); |
4913 | break; | |
b380e5c7 | 4914 | case NFT_MSG_NEWRULE: |
4fefee57 | 4915 | trans->ctx.chain->use--; |
b380e5c7 PNA |
4916 | list_del_rcu(&nft_trans_rule(trans)->list); |
4917 | break; | |
4918 | case NFT_MSG_DELRULE: | |
4fefee57 | 4919 | trans->ctx.chain->use++; |
889f7ee7 | 4920 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
37082f93 | 4921 | nft_trans_destroy(trans); |
b380e5c7 | 4922 | break; |
958bee14 | 4923 | case NFT_MSG_NEWSET: |
4fefee57 | 4924 | trans->ctx.table->use--; |
e688a7f8 | 4925 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
4926 | break; |
4927 | case NFT_MSG_DELSET: | |
4fefee57 | 4928 | trans->ctx.table->use++; |
37a9cc52 | 4929 | nft_clear(trans->ctx.net, nft_trans_set(trans)); |
958bee14 PNA |
4930 | nft_trans_destroy(trans); |
4931 | break; | |
60319eb1 | 4932 | case NFT_MSG_NEWSETELEM: |
02263db0 | 4933 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 4934 | |
02263db0 | 4935 | te->set->ops->remove(te->set, &te->elem); |
3dd0673a | 4936 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
4937 | break; |
4938 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
4939 | te = (struct nft_trans_elem *)trans->data; |
4940 | ||
42a55769 | 4941 | te->set->ops->activate(net, te->set, &te->elem); |
3dd0673a | 4942 | te->set->ndeact--; |
cc02e457 | 4943 | |
e5009240 PNA |
4944 | nft_trans_destroy(trans); |
4945 | break; | |
4946 | case NFT_MSG_NEWOBJ: | |
4947 | trans->ctx.table->use--; | |
4948 | list_del_rcu(&nft_trans_obj(trans)->list); | |
4949 | break; | |
4950 | case NFT_MSG_DELOBJ: | |
4951 | trans->ctx.table->use++; | |
4952 | nft_clear(trans->ctx.net, nft_trans_obj(trans)); | |
60319eb1 PNA |
4953 | nft_trans_destroy(trans); |
4954 | break; | |
37082f93 | 4955 | } |
37082f93 PNA |
4956 | } |
4957 | ||
b326dd37 PNA |
4958 | synchronize_rcu(); |
4959 | ||
a1cee076 PNA |
4960 | list_for_each_entry_safe_reverse(trans, next, |
4961 | &net->nft.commit_list, list) { | |
c7c32e72 | 4962 | list_del(&trans->list); |
b326dd37 | 4963 | nf_tables_abort_release(trans); |
37082f93 PNA |
4964 | } |
4965 | ||
4966 | return 0; | |
4967 | } | |
4968 | ||
96518518 PM |
4969 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
4970 | .name = "nf_tables", | |
4971 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
4972 | .cb_count = NFT_MSG_MAX, | |
4973 | .cb = nf_tables_cb, | |
0628b123 PNA |
4974 | .commit = nf_tables_commit, |
4975 | .abort = nf_tables_abort, | |
96518518 PM |
4976 | }; |
4977 | ||
7210e4e3 PNA |
4978 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
4979 | enum nft_chain_type type) | |
4980 | { | |
4981 | const struct nft_base_chain *basechain; | |
4982 | ||
4983 | if (chain->flags & NFT_BASE_CHAIN) { | |
4984 | basechain = nft_base_chain(chain); | |
4985 | if (basechain->type->type != type) | |
4986 | return -EOPNOTSUPP; | |
4987 | } | |
4988 | return 0; | |
4989 | } | |
4990 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
4991 | ||
75e8d06d PNA |
4992 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
4993 | unsigned int hook_flags) | |
4994 | { | |
4995 | struct nft_base_chain *basechain; | |
4996 | ||
4997 | if (chain->flags & NFT_BASE_CHAIN) { | |
4998 | basechain = nft_base_chain(chain); | |
4999 | ||
5000 | if ((1 << basechain->ops[0].hooknum) & hook_flags) | |
5001 | return 0; | |
5002 | ||
5003 | return -EOPNOTSUPP; | |
5004 | } | |
5005 | ||
5006 | return 0; | |
5007 | } | |
5008 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
5009 | ||
20a69341 PM |
5010 | /* |
5011 | * Loop detection - walk through the ruleset beginning at the destination chain | |
5012 | * of a new jump until either the source chain is reached (loop) or all | |
5013 | * reachable chains have been traversed. | |
5014 | * | |
5015 | * The loop check is performed whenever a new jump verdict is added to an | |
5016 | * expression or verdict map or a verdict map is bound to a new chain. | |
5017 | */ | |
5018 | ||
5019 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
5020 | const struct nft_chain *chain); | |
5021 | ||
5022 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 5023 | struct nft_set *set, |
20a69341 | 5024 | const struct nft_set_iter *iter, |
de70185d | 5025 | struct nft_set_elem *elem) |
20a69341 | 5026 | { |
fe2811eb PM |
5027 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
5028 | const struct nft_data *data; | |
5029 | ||
5030 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
5031 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
5032 | return 0; |
5033 | ||
fe2811eb | 5034 | data = nft_set_ext_data(ext); |
1ca2e170 | 5035 | switch (data->verdict.code) { |
20a69341 PM |
5036 | case NFT_JUMP: |
5037 | case NFT_GOTO: | |
1ca2e170 | 5038 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
5039 | default: |
5040 | return 0; | |
5041 | } | |
5042 | } | |
5043 | ||
5044 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
5045 | const struct nft_chain *chain) | |
5046 | { | |
5047 | const struct nft_rule *rule; | |
5048 | const struct nft_expr *expr, *last; | |
de70185d | 5049 | struct nft_set *set; |
20a69341 PM |
5050 | struct nft_set_binding *binding; |
5051 | struct nft_set_iter iter; | |
20a69341 PM |
5052 | |
5053 | if (ctx->chain == chain) | |
5054 | return -ELOOP; | |
5055 | ||
5056 | list_for_each_entry(rule, &chain->rules, list) { | |
5057 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
5058 | const struct nft_data *data = NULL; |
5059 | int err; | |
5060 | ||
5061 | if (!expr->ops->validate) | |
20a69341 PM |
5062 | continue; |
5063 | ||
0ca743a5 PNA |
5064 | err = expr->ops->validate(ctx, expr, &data); |
5065 | if (err < 0) | |
5066 | return err; | |
5067 | ||
20a69341 | 5068 | if (data == NULL) |
0ca743a5 | 5069 | continue; |
20a69341 | 5070 | |
1ca2e170 | 5071 | switch (data->verdict.code) { |
20a69341 PM |
5072 | case NFT_JUMP: |
5073 | case NFT_GOTO: | |
1ca2e170 PM |
5074 | err = nf_tables_check_loops(ctx, |
5075 | data->verdict.chain); | |
20a69341 PM |
5076 | if (err < 0) |
5077 | return err; | |
5078 | default: | |
5079 | break; | |
5080 | } | |
5081 | } | |
5082 | } | |
5083 | ||
5084 | list_for_each_entry(set, &ctx->table->sets, list) { | |
37a9cc52 PNA |
5085 | if (!nft_is_active_next(ctx->net, set)) |
5086 | continue; | |
20a69341 PM |
5087 | if (!(set->flags & NFT_SET_MAP) || |
5088 | set->dtype != NFT_DATA_VERDICT) | |
5089 | continue; | |
5090 | ||
5091 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
5092 | if (!(binding->flags & NFT_SET_MAP) || |
5093 | binding->chain != chain) | |
20a69341 PM |
5094 | continue; |
5095 | ||
8588ac09 | 5096 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
5097 | iter.skip = 0; |
5098 | iter.count = 0; | |
5099 | iter.err = 0; | |
5100 | iter.fn = nf_tables_loop_check_setelem; | |
5101 | ||
5102 | set->ops->walk(ctx, set, &iter); | |
5103 | if (iter.err < 0) | |
5104 | return iter.err; | |
5105 | } | |
5106 | } | |
5107 | ||
5108 | return 0; | |
5109 | } | |
5110 | ||
36b701fa LGL |
5111 | /** |
5112 | * nft_parse_u32_check - fetch u32 attribute and check for maximum value | |
5113 | * | |
5114 | * @attr: netlink attribute to fetch value from | |
5115 | * @max: maximum value to be stored in dest | |
5116 | * @dest: pointer to the variable | |
5117 | * | |
5118 | * Parse, check and store a given u32 netlink attribute into variable. | |
5119 | * This function returns -ERANGE if the value goes over maximum value. | |
5120 | * Otherwise a 0 is returned and the attribute value is stored in the | |
5121 | * destination variable. | |
5122 | */ | |
f1d505bb | 5123 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) |
36b701fa | 5124 | { |
09525a09 | 5125 | u32 val; |
36b701fa LGL |
5126 | |
5127 | val = ntohl(nla_get_be32(attr)); | |
5128 | if (val > max) | |
5129 | return -ERANGE; | |
5130 | ||
5131 | *dest = val; | |
5132 | return 0; | |
5133 | } | |
5134 | EXPORT_SYMBOL_GPL(nft_parse_u32_check); | |
5135 | ||
49499c3e PM |
5136 | /** |
5137 | * nft_parse_register - parse a register value from a netlink attribute | |
5138 | * | |
5139 | * @attr: netlink attribute | |
5140 | * | |
5141 | * Parse and translate a register value from a netlink attribute. | |
5142 | * Registers used to be 128 bit wide, these register numbers will be | |
5143 | * mapped to the corresponding 32 bit register numbers. | |
5144 | */ | |
b1c96ed3 PM |
5145 | unsigned int nft_parse_register(const struct nlattr *attr) |
5146 | { | |
49499c3e PM |
5147 | unsigned int reg; |
5148 | ||
5149 | reg = ntohl(nla_get_be32(attr)); | |
5150 | switch (reg) { | |
5151 | case NFT_REG_VERDICT...NFT_REG_4: | |
5152 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
5153 | default: | |
5154 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
5155 | } | |
b1c96ed3 PM |
5156 | } |
5157 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
5158 | ||
49499c3e PM |
5159 | /** |
5160 | * nft_dump_register - dump a register value to a netlink attribute | |
5161 | * | |
5162 | * @skb: socket buffer | |
5163 | * @attr: attribute number | |
5164 | * @reg: register number | |
5165 | * | |
5166 | * Construct a netlink attribute containing the register number. For | |
5167 | * compatibility reasons, register numbers being a multiple of 4 are | |
5168 | * translated to the corresponding 128 bit register numbers. | |
5169 | */ | |
b1c96ed3 PM |
5170 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
5171 | { | |
49499c3e PM |
5172 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
5173 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
5174 | else | |
5175 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
5176 | ||
b1c96ed3 PM |
5177 | return nla_put_be32(skb, attr, htonl(reg)); |
5178 | } | |
5179 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
5180 | ||
96518518 | 5181 | /** |
d07db988 | 5182 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
5183 | * |
5184 | * @reg: the register number | |
d07db988 | 5185 | * @len: the length of the data |
96518518 PM |
5186 | * |
5187 | * Validate that the input register is one of the general purpose | |
d07db988 | 5188 | * registers and that the length of the load is within the bounds. |
96518518 | 5189 | */ |
d07db988 | 5190 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 5191 | { |
49499c3e | 5192 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 5193 | return -EINVAL; |
d07db988 PM |
5194 | if (len == 0) |
5195 | return -EINVAL; | |
49499c3e | 5196 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 5197 | return -ERANGE; |
49499c3e | 5198 | |
96518518 PM |
5199 | return 0; |
5200 | } | |
d07db988 | 5201 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 5202 | |
96518518 | 5203 | /** |
1ec10212 | 5204 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
5205 | * |
5206 | * @ctx: context of the expression performing the load | |
5207 | * @reg: the destination register number | |
5208 | * @data: the data to load | |
5209 | * @type: the data type | |
45d9bcda | 5210 | * @len: the length of the data |
96518518 PM |
5211 | * |
5212 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
5213 | * the destination register and the length is within the bounds. |
5214 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 5215 | * data. |
96518518 | 5216 | */ |
1ec10212 PM |
5217 | int nft_validate_register_store(const struct nft_ctx *ctx, |
5218 | enum nft_registers reg, | |
5219 | const struct nft_data *data, | |
5220 | enum nft_data_types type, unsigned int len) | |
96518518 | 5221 | { |
20a69341 PM |
5222 | int err; |
5223 | ||
96518518 PM |
5224 | switch (reg) { |
5225 | case NFT_REG_VERDICT: | |
58f40ab6 | 5226 | if (type != NFT_DATA_VERDICT) |
96518518 | 5227 | return -EINVAL; |
20a69341 | 5228 | |
58f40ab6 | 5229 | if (data != NULL && |
1ca2e170 PM |
5230 | (data->verdict.code == NFT_GOTO || |
5231 | data->verdict.code == NFT_JUMP)) { | |
5232 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
5233 | if (err < 0) |
5234 | return err; | |
5235 | ||
1ca2e170 PM |
5236 | if (ctx->chain->level + 1 > |
5237 | data->verdict.chain->level) { | |
20a69341 PM |
5238 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
5239 | return -EMLINK; | |
1ca2e170 | 5240 | data->verdict.chain->level = ctx->chain->level + 1; |
20a69341 PM |
5241 | } |
5242 | } | |
5243 | ||
96518518 PM |
5244 | return 0; |
5245 | default: | |
49499c3e | 5246 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 5247 | return -EINVAL; |
45d9bcda PM |
5248 | if (len == 0) |
5249 | return -EINVAL; | |
49499c3e PM |
5250 | if (reg * NFT_REG32_SIZE + len > |
5251 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 5252 | return -ERANGE; |
27e6d201 | 5253 | |
96518518 PM |
5254 | if (data != NULL && type != NFT_DATA_VALUE) |
5255 | return -EINVAL; | |
5256 | return 0; | |
5257 | } | |
5258 | } | |
1ec10212 | 5259 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
5260 | |
5261 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
5262 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
5263 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
5264 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
5265 | }; | |
5266 | ||
5267 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
5268 | struct nft_data_desc *desc, const struct nlattr *nla) | |
5269 | { | |
664b0f8c | 5270 | u8 genmask = nft_genmask_next(ctx->net); |
96518518 PM |
5271 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
5272 | struct nft_chain *chain; | |
5273 | int err; | |
5274 | ||
5275 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); | |
5276 | if (err < 0) | |
5277 | return err; | |
5278 | ||
5279 | if (!tb[NFTA_VERDICT_CODE]) | |
5280 | return -EINVAL; | |
1ca2e170 | 5281 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 5282 | |
1ca2e170 | 5283 | switch (data->verdict.code) { |
e0abdadc | 5284 | default: |
1ca2e170 | 5285 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
5286 | case NF_ACCEPT: |
5287 | case NF_DROP: | |
5288 | case NF_QUEUE: | |
5289 | break; | |
5290 | default: | |
5291 | return -EINVAL; | |
5292 | } | |
5293 | /* fall through */ | |
96518518 PM |
5294 | case NFT_CONTINUE: |
5295 | case NFT_BREAK: | |
5296 | case NFT_RETURN: | |
96518518 PM |
5297 | break; |
5298 | case NFT_JUMP: | |
5299 | case NFT_GOTO: | |
5300 | if (!tb[NFTA_VERDICT_CHAIN]) | |
5301 | return -EINVAL; | |
5302 | chain = nf_tables_chain_lookup(ctx->table, | |
664b0f8c | 5303 | tb[NFTA_VERDICT_CHAIN], genmask); |
96518518 PM |
5304 | if (IS_ERR(chain)) |
5305 | return PTR_ERR(chain); | |
5306 | if (chain->flags & NFT_BASE_CHAIN) | |
5307 | return -EOPNOTSUPP; | |
5308 | ||
96518518 | 5309 | chain->use++; |
1ca2e170 | 5310 | data->verdict.chain = chain; |
96518518 | 5311 | break; |
96518518 PM |
5312 | } |
5313 | ||
4c4ed074 | 5314 | desc->len = sizeof(data->verdict); |
96518518 PM |
5315 | desc->type = NFT_DATA_VERDICT; |
5316 | return 0; | |
5317 | } | |
5318 | ||
5319 | static void nft_verdict_uninit(const struct nft_data *data) | |
5320 | { | |
1ca2e170 | 5321 | switch (data->verdict.code) { |
96518518 PM |
5322 | case NFT_JUMP: |
5323 | case NFT_GOTO: | |
1ca2e170 | 5324 | data->verdict.chain->use--; |
96518518 PM |
5325 | break; |
5326 | } | |
5327 | } | |
5328 | ||
33d5a7b1 | 5329 | int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) |
96518518 PM |
5330 | { |
5331 | struct nlattr *nest; | |
5332 | ||
33d5a7b1 | 5333 | nest = nla_nest_start(skb, type); |
96518518 PM |
5334 | if (!nest) |
5335 | goto nla_put_failure; | |
5336 | ||
33d5a7b1 | 5337 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) |
96518518 PM |
5338 | goto nla_put_failure; |
5339 | ||
33d5a7b1 | 5340 | switch (v->code) { |
96518518 PM |
5341 | case NFT_JUMP: |
5342 | case NFT_GOTO: | |
1ca2e170 | 5343 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
33d5a7b1 | 5344 | v->chain->name)) |
96518518 PM |
5345 | goto nla_put_failure; |
5346 | } | |
5347 | nla_nest_end(skb, nest); | |
5348 | return 0; | |
5349 | ||
5350 | nla_put_failure: | |
5351 | return -1; | |
5352 | } | |
5353 | ||
d0a11fc3 PM |
5354 | static int nft_value_init(const struct nft_ctx *ctx, |
5355 | struct nft_data *data, unsigned int size, | |
96518518 PM |
5356 | struct nft_data_desc *desc, const struct nlattr *nla) |
5357 | { | |
5358 | unsigned int len; | |
5359 | ||
5360 | len = nla_len(nla); | |
5361 | if (len == 0) | |
5362 | return -EINVAL; | |
d0a11fc3 | 5363 | if (len > size) |
96518518 PM |
5364 | return -EOVERFLOW; |
5365 | ||
d0a11fc3 | 5366 | nla_memcpy(data->data, nla, len); |
96518518 PM |
5367 | desc->type = NFT_DATA_VALUE; |
5368 | desc->len = len; | |
5369 | return 0; | |
5370 | } | |
5371 | ||
5372 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
5373 | unsigned int len) | |
5374 | { | |
5375 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
5376 | } | |
5377 | ||
5378 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 5379 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
5380 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
5381 | }; | |
5382 | ||
5383 | /** | |
5384 | * nft_data_init - parse nf_tables data netlink attributes | |
5385 | * | |
5386 | * @ctx: context of the expression using the data | |
5387 | * @data: destination struct nft_data | |
d0a11fc3 | 5388 | * @size: maximum data length |
96518518 PM |
5389 | * @desc: data description |
5390 | * @nla: netlink attribute containing data | |
5391 | * | |
5392 | * Parse the netlink data attributes and initialize a struct nft_data. | |
5393 | * The type and length of data are returned in the data description. | |
5394 | * | |
5395 | * The caller can indicate that it only wants to accept data of type | |
5396 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
5397 | */ | |
d0a11fc3 PM |
5398 | int nft_data_init(const struct nft_ctx *ctx, |
5399 | struct nft_data *data, unsigned int size, | |
96518518 PM |
5400 | struct nft_data_desc *desc, const struct nlattr *nla) |
5401 | { | |
5402 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
5403 | int err; | |
5404 | ||
5405 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); | |
5406 | if (err < 0) | |
5407 | return err; | |
5408 | ||
5409 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
5410 | return nft_value_init(ctx, data, size, desc, |
5411 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
5412 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
5413 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
5414 | return -EINVAL; | |
5415 | } | |
5416 | EXPORT_SYMBOL_GPL(nft_data_init); | |
5417 | ||
5418 | /** | |
5419 | * nft_data_uninit - release a nft_data item | |
5420 | * | |
5421 | * @data: struct nft_data to release | |
5422 | * @type: type of data | |
5423 | * | |
5424 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
5425 | * all others need to be released by calling this function. | |
5426 | */ | |
5427 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) | |
5428 | { | |
960bd2c2 | 5429 | if (type < NFT_DATA_VERDICT) |
96518518 | 5430 | return; |
960bd2c2 | 5431 | switch (type) { |
96518518 PM |
5432 | case NFT_DATA_VERDICT: |
5433 | return nft_verdict_uninit(data); | |
5434 | default: | |
5435 | WARN_ON(1); | |
5436 | } | |
5437 | } | |
5438 | EXPORT_SYMBOL_GPL(nft_data_uninit); | |
5439 | ||
5440 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
5441 | enum nft_data_types type, unsigned int len) | |
5442 | { | |
5443 | struct nlattr *nest; | |
5444 | int err; | |
5445 | ||
5446 | nest = nla_nest_start(skb, attr); | |
5447 | if (nest == NULL) | |
5448 | return -1; | |
5449 | ||
5450 | switch (type) { | |
5451 | case NFT_DATA_VALUE: | |
5452 | err = nft_value_dump(skb, data, len); | |
5453 | break; | |
5454 | case NFT_DATA_VERDICT: | |
33d5a7b1 | 5455 | err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); |
96518518 PM |
5456 | break; |
5457 | default: | |
5458 | err = -EINVAL; | |
5459 | WARN_ON(1); | |
5460 | } | |
5461 | ||
5462 | nla_nest_end(skb, nest); | |
5463 | return err; | |
5464 | } | |
5465 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
5466 | ||
df05ef87 | 5467 | static int __net_init nf_tables_init_net(struct net *net) |
99633ab2 PNA |
5468 | { |
5469 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 5470 | INIT_LIST_HEAD(&net->nft.commit_list); |
38e029f1 | 5471 | net->nft.base_seq = 1; |
99633ab2 PNA |
5472 | return 0; |
5473 | } | |
5474 | ||
5ebe0b0e PNA |
5475 | int __nft_release_basechain(struct nft_ctx *ctx) |
5476 | { | |
5477 | struct nft_rule *rule, *nr; | |
5478 | ||
5479 | BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN)); | |
5480 | ||
82bec71d | 5481 | nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain, |
5ebe0b0e PNA |
5482 | ctx->afi->nops); |
5483 | list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { | |
5484 | list_del(&rule->list); | |
5485 | ctx->chain->use--; | |
5486 | nf_tables_rule_destroy(ctx, rule); | |
5487 | } | |
5488 | list_del(&ctx->chain->list); | |
5489 | ctx->table->use--; | |
5490 | nf_tables_chain_destroy(ctx->chain); | |
5491 | ||
5492 | return 0; | |
5493 | } | |
5494 | EXPORT_SYMBOL_GPL(__nft_release_basechain); | |
5495 | ||
df05ef87 PNA |
5496 | /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */ |
5497 | static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi) | |
5498 | { | |
5499 | struct nft_table *table, *nt; | |
5500 | struct nft_chain *chain, *nc; | |
e5009240 | 5501 | struct nft_object *obj, *ne; |
df05ef87 PNA |
5502 | struct nft_rule *rule, *nr; |
5503 | struct nft_set *set, *ns; | |
5504 | struct nft_ctx ctx = { | |
5505 | .net = net, | |
5506 | .afi = afi, | |
5507 | }; | |
5508 | ||
5509 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
5510 | list_for_each_entry(chain, &table->chains, list) | |
82bec71d PNA |
5511 | nf_tables_unregister_hooks(net, table, chain, |
5512 | afi->nops); | |
df05ef87 PNA |
5513 | /* No packets are walking on these chains anymore. */ |
5514 | ctx.table = table; | |
5515 | list_for_each_entry(chain, &table->chains, list) { | |
5516 | ctx.chain = chain; | |
5517 | list_for_each_entry_safe(rule, nr, &chain->rules, list) { | |
5518 | list_del(&rule->list); | |
5519 | chain->use--; | |
5520 | nf_tables_rule_destroy(&ctx, rule); | |
5521 | } | |
5522 | } | |
5523 | list_for_each_entry_safe(set, ns, &table->sets, list) { | |
5524 | list_del(&set->list); | |
5525 | table->use--; | |
5526 | nft_set_destroy(set); | |
5527 | } | |
e5009240 PNA |
5528 | list_for_each_entry_safe(obj, ne, &table->objects, list) { |
5529 | list_del(&obj->list); | |
5530 | table->use--; | |
5531 | nft_obj_destroy(obj); | |
5532 | } | |
df05ef87 PNA |
5533 | list_for_each_entry_safe(chain, nc, &table->chains, list) { |
5534 | list_del(&chain->list); | |
5535 | table->use--; | |
5536 | nf_tables_chain_destroy(chain); | |
5537 | } | |
5538 | list_del(&table->list); | |
5539 | nf_tables_table_destroy(&ctx); | |
5540 | } | |
5541 | } | |
5542 | ||
99633ab2 PNA |
5543 | static struct pernet_operations nf_tables_net_ops = { |
5544 | .init = nf_tables_init_net, | |
5545 | }; | |
5546 | ||
96518518 PM |
5547 | static int __init nf_tables_module_init(void) |
5548 | { | |
5549 | int err; | |
5550 | ||
5551 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
5552 | GFP_KERNEL); | |
5553 | if (info == NULL) { | |
5554 | err = -ENOMEM; | |
5555 | goto err1; | |
5556 | } | |
5557 | ||
5558 | err = nf_tables_core_module_init(); | |
5559 | if (err < 0) | |
5560 | goto err2; | |
5561 | ||
5562 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
5563 | if (err < 0) | |
5564 | goto err3; | |
5565 | ||
5566 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 5567 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
5568 | err3: |
5569 | nf_tables_core_module_exit(); | |
5570 | err2: | |
5571 | kfree(info); | |
5572 | err1: | |
5573 | return err; | |
5574 | } | |
5575 | ||
5576 | static void __exit nf_tables_module_exit(void) | |
5577 | { | |
99633ab2 | 5578 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 | 5579 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
1b1bc49c | 5580 | rcu_barrier(); |
96518518 PM |
5581 | nf_tables_core_module_exit(); |
5582 | kfree(info); | |
5583 | } | |
5584 | ||
5585 | module_init(nf_tables_module_init); | |
5586 | module_exit(nf_tables_module_exit); | |
5587 | ||
5588 | MODULE_LICENSE("GPL"); | |
5589 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
5590 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |