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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 | ||
10435c11 F |
579 | static void _nf_tables_table_disable(struct net *net, |
580 | const struct nft_af_info *afi, | |
581 | struct nft_table *table, | |
582 | u32 cnt) | |
583 | { | |
584 | struct nft_chain *chain; | |
585 | u32 i = 0; | |
586 | ||
587 | list_for_each_entry(chain, &table->chains, list) { | |
588 | if (!nft_is_active_next(net, chain)) | |
589 | continue; | |
590 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
591 | continue; | |
592 | ||
593 | if (cnt && i++ == cnt) | |
594 | break; | |
595 | ||
596 | nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, | |
597 | afi->nops); | |
598 | } | |
599 | } | |
600 | ||
664b0f8c PNA |
601 | static int nf_tables_table_enable(struct net *net, |
602 | const struct nft_af_info *afi, | |
115a60b1 | 603 | struct nft_table *table) |
9ddf6323 PNA |
604 | { |
605 | struct nft_chain *chain; | |
606 | int err, i = 0; | |
607 | ||
608 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
609 | if (!nft_is_active_next(net, chain)) |
610 | continue; | |
d2012975 PNA |
611 | if (!(chain->flags & NFT_BASE_CHAIN)) |
612 | continue; | |
613 | ||
82bec71d PNA |
614 | err = nf_register_net_hooks(net, nft_base_chain(chain)->ops, |
615 | afi->nops); | |
9ddf6323 PNA |
616 | if (err < 0) |
617 | goto err; | |
618 | ||
619 | i++; | |
620 | } | |
621 | return 0; | |
622 | err: | |
10435c11 F |
623 | if (i) |
624 | _nf_tables_table_disable(net, afi, table, i); | |
9ddf6323 PNA |
625 | return err; |
626 | } | |
627 | ||
664b0f8c PNA |
628 | static void nf_tables_table_disable(struct net *net, |
629 | const struct nft_af_info *afi, | |
d8ee8f7c | 630 | struct nft_table *table) |
9ddf6323 | 631 | { |
10435c11 | 632 | _nf_tables_table_disable(net, afi, table, 0); |
9ddf6323 PNA |
633 | } |
634 | ||
e1aaca93 | 635 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 636 | { |
55dd6f93 | 637 | struct nft_trans *trans; |
e1aaca93 | 638 | u32 flags; |
55dd6f93 | 639 | int ret = 0; |
9ddf6323 | 640 | |
e1aaca93 PNA |
641 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
642 | return 0; | |
9ddf6323 | 643 | |
e1aaca93 PNA |
644 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
645 | if (flags & ~NFT_TABLE_F_DORMANT) | |
646 | return -EINVAL; | |
647 | ||
63283dd2 PNA |
648 | if (flags == ctx->table->flags) |
649 | return 0; | |
650 | ||
55dd6f93 PNA |
651 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
652 | sizeof(struct nft_trans_table)); | |
653 | if (trans == NULL) | |
654 | return -ENOMEM; | |
9ddf6323 | 655 | |
e1aaca93 PNA |
656 | if ((flags & NFT_TABLE_F_DORMANT) && |
657 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 658 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
659 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
660 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
664b0f8c | 661 | ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table); |
55dd6f93 | 662 | if (ret >= 0) { |
e1aaca93 | 663 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 664 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 665 | } |
9ddf6323 | 666 | } |
e1aaca93 PNA |
667 | if (ret < 0) |
668 | goto err; | |
9ddf6323 | 669 | |
55dd6f93 PNA |
670 | nft_trans_table_update(trans) = true; |
671 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
672 | return 0; | |
9ddf6323 | 673 | err: |
55dd6f93 | 674 | nft_trans_destroy(trans); |
9ddf6323 PNA |
675 | return ret; |
676 | } | |
677 | ||
633c9a84 PNA |
678 | static int nf_tables_newtable(struct net *net, struct sock *nlsk, |
679 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
680 | const struct nlattr * const nla[]) |
681 | { | |
682 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 683 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
684 | const struct nlattr *name; |
685 | struct nft_af_info *afi; | |
686 | struct nft_table *table; | |
687 | int family = nfmsg->nfgen_family; | |
c5c1f975 | 688 | u32 flags = 0; |
e1aaca93 | 689 | struct nft_ctx ctx; |
55dd6f93 | 690 | int err; |
96518518 | 691 | |
99633ab2 | 692 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
693 | if (IS_ERR(afi)) |
694 | return PTR_ERR(afi); | |
695 | ||
696 | name = nla[NFTA_TABLE_NAME]; | |
f2a6d766 | 697 | table = nf_tables_table_lookup(afi, name, genmask); |
96518518 PM |
698 | if (IS_ERR(table)) { |
699 | if (PTR_ERR(table) != -ENOENT) | |
700 | return PTR_ERR(table); | |
1a28ad74 | 701 | } else { |
96518518 PM |
702 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
703 | return -EEXIST; | |
704 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
705 | return -EOPNOTSUPP; | |
e1aaca93 | 706 | |
633c9a84 | 707 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
e1aaca93 | 708 | return nf_tables_updtable(&ctx); |
96518518 PM |
709 | } |
710 | ||
c5c1f975 PM |
711 | if (nla[NFTA_TABLE_FLAGS]) { |
712 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
713 | if (flags & ~NFT_TABLE_F_DORMANT) | |
714 | return -EINVAL; | |
715 | } | |
716 | ||
ebddf1a8 | 717 | err = -EAFNOSUPPORT; |
7047f9d0 | 718 | if (!try_module_get(afi->owner)) |
ebddf1a8 | 719 | goto err1; |
7047f9d0 | 720 | |
ffdb210e | 721 | err = -ENOMEM; |
1cae565e | 722 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
ffdb210e | 723 | if (table == NULL) |
ebddf1a8 | 724 | goto err2; |
96518518 | 725 | |
1cae565e | 726 | nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN); |
96518518 | 727 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 728 | INIT_LIST_HEAD(&table->sets); |
e5009240 | 729 | INIT_LIST_HEAD(&table->objects); |
c5c1f975 | 730 | table->flags = flags; |
9ddf6323 | 731 | |
633c9a84 | 732 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
55dd6f93 | 733 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
ffdb210e | 734 | if (err < 0) |
ebddf1a8 | 735 | goto err3; |
ffdb210e | 736 | |
e688a7f8 | 737 | list_add_tail_rcu(&table->list, &afi->tables); |
96518518 | 738 | return 0; |
ebddf1a8 | 739 | err3: |
ffdb210e | 740 | kfree(table); |
ebddf1a8 | 741 | err2: |
ffdb210e | 742 | module_put(afi->owner); |
ebddf1a8 | 743 | err1: |
ffdb210e | 744 | return err; |
96518518 PM |
745 | } |
746 | ||
b9ac12ef AB |
747 | static int nft_flush_table(struct nft_ctx *ctx) |
748 | { | |
749 | int err; | |
750 | struct nft_chain *chain, *nc; | |
e5009240 | 751 | struct nft_object *obj, *ne; |
b9ac12ef AB |
752 | struct nft_set *set, *ns; |
753 | ||
a2f18db0 | 754 | list_for_each_entry(chain, &ctx->table->chains, list) { |
664b0f8c PNA |
755 | if (!nft_is_active_next(ctx->net, chain)) |
756 | continue; | |
757 | ||
b9ac12ef AB |
758 | ctx->chain = chain; |
759 | ||
760 | err = nft_delrule_by_chain(ctx); | |
761 | if (err < 0) | |
762 | goto out; | |
b9ac12ef AB |
763 | } |
764 | ||
765 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
37a9cc52 PNA |
766 | if (!nft_is_active_next(ctx->net, set)) |
767 | continue; | |
768 | ||
b9ac12ef AB |
769 | if (set->flags & NFT_SET_ANONYMOUS && |
770 | !list_empty(&set->bindings)) | |
771 | continue; | |
772 | ||
773 | err = nft_delset(ctx, set); | |
774 | if (err < 0) | |
775 | goto out; | |
776 | } | |
777 | ||
e5009240 PNA |
778 | list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { |
779 | err = nft_delobj(ctx, obj); | |
780 | if (err < 0) | |
781 | goto out; | |
782 | } | |
783 | ||
a2f18db0 | 784 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
664b0f8c PNA |
785 | if (!nft_is_active_next(ctx->net, chain)) |
786 | continue; | |
787 | ||
a2f18db0 PNA |
788 | ctx->chain = chain; |
789 | ||
790 | err = nft_delchain(ctx); | |
791 | if (err < 0) | |
792 | goto out; | |
793 | } | |
794 | ||
b9ac12ef AB |
795 | err = nft_deltable(ctx); |
796 | out: | |
797 | return err; | |
798 | } | |
799 | ||
800 | static int nft_flush(struct nft_ctx *ctx, int family) | |
801 | { | |
802 | struct nft_af_info *afi; | |
803 | struct nft_table *table, *nt; | |
804 | const struct nlattr * const *nla = ctx->nla; | |
805 | int err = 0; | |
806 | ||
807 | list_for_each_entry(afi, &ctx->net->nft.af_info, list) { | |
808 | if (family != AF_UNSPEC && afi->family != family) | |
809 | continue; | |
810 | ||
811 | ctx->afi = afi; | |
812 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
f2a6d766 PNA |
813 | if (!nft_is_active_next(ctx->net, table)) |
814 | continue; | |
815 | ||
b9ac12ef AB |
816 | if (nla[NFTA_TABLE_NAME] && |
817 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
818 | continue; | |
819 | ||
820 | ctx->table = table; | |
821 | ||
822 | err = nft_flush_table(ctx); | |
823 | if (err < 0) | |
824 | goto out; | |
825 | } | |
826 | } | |
827 | out: | |
828 | return err; | |
829 | } | |
830 | ||
633c9a84 PNA |
831 | static int nf_tables_deltable(struct net *net, struct sock *nlsk, |
832 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
833 | const struct nlattr * const nla[]) |
834 | { | |
835 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 836 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
837 | struct nft_af_info *afi; |
838 | struct nft_table *table; | |
ee01d542 | 839 | int family = nfmsg->nfgen_family; |
55dd6f93 | 840 | struct nft_ctx ctx; |
96518518 | 841 | |
633c9a84 | 842 | nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla); |
b9ac12ef AB |
843 | if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL) |
844 | return nft_flush(&ctx, family); | |
845 | ||
99633ab2 | 846 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
847 | if (IS_ERR(afi)) |
848 | return PTR_ERR(afi); | |
849 | ||
f2a6d766 | 850 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
851 | if (IS_ERR(table)) |
852 | return PTR_ERR(table); | |
96518518 | 853 | |
b9ac12ef AB |
854 | ctx.afi = afi; |
855 | ctx.table = table; | |
55dd6f93 | 856 | |
b9ac12ef | 857 | return nft_flush_table(&ctx); |
96518518 PM |
858 | } |
859 | ||
55dd6f93 PNA |
860 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
861 | { | |
4fefee57 PNA |
862 | BUG_ON(ctx->table->use > 0); |
863 | ||
55dd6f93 PNA |
864 | kfree(ctx->table); |
865 | module_put(ctx->afi->owner); | |
866 | } | |
867 | ||
2a37d755 | 868 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 869 | { |
9370761c | 870 | int err = 0; |
96518518 PM |
871 | |
872 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
9370761c PNA |
873 | if (chain_type[ctype->family][ctype->type] != NULL) { |
874 | err = -EBUSY; | |
875 | goto out; | |
96518518 | 876 | } |
9370761c PNA |
877 | chain_type[ctype->family][ctype->type] = ctype; |
878 | out: | |
96518518 PM |
879 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
880 | return err; | |
881 | } | |
9370761c | 882 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 883 | |
2a37d755 | 884 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 885 | { |
96518518 | 886 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 887 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
888 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
889 | } | |
9370761c | 890 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
891 | |
892 | /* | |
893 | * Chains | |
894 | */ | |
895 | ||
896 | static struct nft_chain * | |
664b0f8c PNA |
897 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle, |
898 | u8 genmask) | |
96518518 PM |
899 | { |
900 | struct nft_chain *chain; | |
901 | ||
902 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
903 | if (chain->handle == handle && |
904 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
905 | return chain; |
906 | } | |
907 | ||
908 | return ERR_PTR(-ENOENT); | |
909 | } | |
910 | ||
911 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
664b0f8c PNA |
912 | const struct nlattr *nla, |
913 | u8 genmask) | |
96518518 PM |
914 | { |
915 | struct nft_chain *chain; | |
916 | ||
917 | if (nla == NULL) | |
918 | return ERR_PTR(-EINVAL); | |
919 | ||
920 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
921 | if (!nla_strcmp(nla, chain->name) && |
922 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
923 | return chain; |
924 | } | |
925 | ||
926 | return ERR_PTR(-ENOENT); | |
927 | } | |
928 | ||
929 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
b2fbd044 LZ |
930 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, |
931 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
932 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
933 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
934 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
935 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 936 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 937 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 938 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
939 | }; |
940 | ||
941 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
942 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
943 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
2cbce139 PNA |
944 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
945 | .len = IFNAMSIZ - 1 }, | |
96518518 PM |
946 | }; |
947 | ||
0ca743a5 PNA |
948 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
949 | { | |
950 | struct nft_stats *cpu_stats, total; | |
951 | struct nlattr *nest; | |
ce355e20 ED |
952 | unsigned int seq; |
953 | u64 pkts, bytes; | |
0ca743a5 PNA |
954 | int cpu; |
955 | ||
956 | memset(&total, 0, sizeof(total)); | |
957 | for_each_possible_cpu(cpu) { | |
958 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
959 | do { |
960 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
961 | pkts = cpu_stats->pkts; | |
962 | bytes = cpu_stats->bytes; | |
963 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
964 | total.pkts += pkts; | |
965 | total.bytes += bytes; | |
0ca743a5 PNA |
966 | } |
967 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
968 | if (nest == NULL) | |
969 | goto nla_put_failure; | |
970 | ||
b46f6ded ND |
971 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), |
972 | NFTA_COUNTER_PAD) || | |
973 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), | |
974 | NFTA_COUNTER_PAD)) | |
0ca743a5 PNA |
975 | goto nla_put_failure; |
976 | ||
977 | nla_nest_end(skb, nest); | |
978 | return 0; | |
979 | ||
980 | nla_put_failure: | |
981 | return -ENOSPC; | |
982 | } | |
983 | ||
84d7fce6 PNA |
984 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
985 | u32 portid, u32 seq, int event, u32 flags, | |
986 | int family, const struct nft_table *table, | |
96518518 PM |
987 | const struct nft_chain *chain) |
988 | { | |
989 | struct nlmsghdr *nlh; | |
990 | struct nfgenmsg *nfmsg; | |
991 | ||
992 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
993 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
994 | if (nlh == NULL) | |
995 | goto nla_put_failure; | |
996 | ||
997 | nfmsg = nlmsg_data(nlh); | |
998 | nfmsg->nfgen_family = family; | |
999 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1000 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1001 | |
1002 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
1003 | goto nla_put_failure; | |
b46f6ded ND |
1004 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), |
1005 | NFTA_CHAIN_PAD)) | |
96518518 PM |
1006 | goto nla_put_failure; |
1007 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
1008 | goto nla_put_failure; | |
1009 | ||
1010 | if (chain->flags & NFT_BASE_CHAIN) { | |
0ca743a5 | 1011 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 1012 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
1013 | struct nlattr *nest; |
1014 | ||
1015 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
1016 | if (nest == NULL) |
1017 | goto nla_put_failure; | |
1018 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
1019 | goto nla_put_failure; | |
1020 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
1021 | goto nla_put_failure; | |
2cbce139 PNA |
1022 | if (basechain->dev_name[0] && |
1023 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) | |
1024 | goto nla_put_failure; | |
96518518 | 1025 | nla_nest_end(skb, nest); |
9370761c | 1026 | |
0ca743a5 PNA |
1027 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
1028 | htonl(basechain->policy))) | |
1029 | goto nla_put_failure; | |
1030 | ||
baae3e62 PM |
1031 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
1032 | goto nla_put_failure; | |
0ca743a5 PNA |
1033 | |
1034 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
1035 | goto nla_put_failure; | |
96518518 PM |
1036 | } |
1037 | ||
0ca743a5 PNA |
1038 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
1039 | goto nla_put_failure; | |
1040 | ||
053c095a JB |
1041 | nlmsg_end(skb, nlh); |
1042 | return 0; | |
96518518 PM |
1043 | |
1044 | nla_put_failure: | |
1045 | nlmsg_trim(skb, nlh); | |
1046 | return -1; | |
1047 | } | |
1048 | ||
35151d84 | 1049 | static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
1050 | { |
1051 | struct sk_buff *skb; | |
96518518 PM |
1052 | int err; |
1053 | ||
128ad332 PNA |
1054 | if (!ctx->report && |
1055 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
1056 | return 0; |
1057 | ||
1058 | err = -ENOBUFS; | |
1059 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1060 | if (skb == NULL) | |
1061 | goto err; | |
1062 | ||
84d7fce6 PNA |
1063 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
1064 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1065 | ctx->chain); |
96518518 PM |
1066 | if (err < 0) { |
1067 | kfree_skb(skb); | |
1068 | goto err; | |
1069 | } | |
1070 | ||
128ad332 PNA |
1071 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1072 | ctx->report, GFP_KERNEL); | |
96518518 | 1073 | err: |
128ad332 PNA |
1074 | if (err < 0) { |
1075 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
1076 | err); | |
1077 | } | |
96518518 PM |
1078 | return err; |
1079 | } | |
1080 | ||
1081 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1082 | struct netlink_callback *cb) | |
1083 | { | |
1084 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1085 | const struct nft_af_info *afi; | |
1086 | const struct nft_table *table; | |
1087 | const struct nft_chain *chain; | |
1088 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1089 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1090 | int family = nfmsg->nfgen_family; |
1091 | ||
e688a7f8 | 1092 | rcu_read_lock(); |
38e029f1 PNA |
1093 | cb->seq = net->nft.base_seq; |
1094 | ||
e688a7f8 | 1095 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1096 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1097 | continue; | |
1098 | ||
e688a7f8 PNA |
1099 | list_for_each_entry_rcu(table, &afi->tables, list) { |
1100 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
96518518 PM |
1101 | if (idx < s_idx) |
1102 | goto cont; | |
1103 | if (idx > s_idx) | |
1104 | memset(&cb->args[1], 0, | |
1105 | sizeof(cb->args) - sizeof(cb->args[0])); | |
664b0f8c PNA |
1106 | if (!nft_is_active(net, chain)) |
1107 | continue; | |
84d7fce6 PNA |
1108 | if (nf_tables_fill_chain_info(skb, net, |
1109 | NETLINK_CB(cb->skb).portid, | |
96518518 PM |
1110 | cb->nlh->nlmsg_seq, |
1111 | NFT_MSG_NEWCHAIN, | |
1112 | NLM_F_MULTI, | |
1113 | afi->family, table, chain) < 0) | |
1114 | goto done; | |
38e029f1 PNA |
1115 | |
1116 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
1117 | cont: |
1118 | idx++; | |
1119 | } | |
1120 | } | |
1121 | } | |
1122 | done: | |
e688a7f8 | 1123 | rcu_read_unlock(); |
96518518 PM |
1124 | cb->args[0] = idx; |
1125 | return skb->len; | |
1126 | } | |
1127 | ||
7b8002a1 PNA |
1128 | static int nf_tables_getchain(struct net *net, struct sock *nlsk, |
1129 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
1130 | const struct nlattr * const nla[]) |
1131 | { | |
1132 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1133 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
1134 | const struct nft_af_info *afi; |
1135 | const struct nft_table *table; | |
1136 | const struct nft_chain *chain; | |
1137 | struct sk_buff *skb2; | |
1138 | int family = nfmsg->nfgen_family; | |
1139 | int err; | |
1140 | ||
1141 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1142 | struct netlink_dump_control c = { | |
1143 | .dump = nf_tables_dump_chains, | |
1144 | }; | |
1145 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1146 | } | |
1147 | ||
99633ab2 | 1148 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1149 | if (IS_ERR(afi)) |
1150 | return PTR_ERR(afi); | |
1151 | ||
f2a6d766 | 1152 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1153 | if (IS_ERR(table)) |
1154 | return PTR_ERR(table); | |
1155 | ||
664b0f8c | 1156 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1157 | if (IS_ERR(chain)) |
1158 | return PTR_ERR(chain); | |
1159 | ||
1160 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1161 | if (!skb2) | |
1162 | return -ENOMEM; | |
1163 | ||
84d7fce6 | 1164 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1165 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1166 | family, table, chain); | |
1167 | if (err < 0) | |
1168 | goto err; | |
1169 | ||
1170 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1171 | ||
1172 | err: | |
1173 | kfree_skb(skb2); | |
1174 | return err; | |
1175 | } | |
1176 | ||
0ca743a5 PNA |
1177 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1178 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1179 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1180 | }; | |
1181 | ||
ff3cd7b3 | 1182 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1183 | { |
1184 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1185 | struct nft_stats __percpu *newstats; | |
1186 | struct nft_stats *stats; | |
1187 | int err; | |
1188 | ||
1189 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); | |
1190 | if (err < 0) | |
ff3cd7b3 | 1191 | return ERR_PTR(err); |
0ca743a5 PNA |
1192 | |
1193 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1194 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1195 | |
ce355e20 | 1196 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1197 | if (newstats == NULL) |
ff3cd7b3 | 1198 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1199 | |
1200 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1201 | * are not exposed to userspace. | |
1202 | */ | |
e8781f70 | 1203 | preempt_disable(); |
0ca743a5 PNA |
1204 | stats = this_cpu_ptr(newstats); |
1205 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1206 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1207 | preempt_enable(); |
0ca743a5 | 1208 | |
ff3cd7b3 PNA |
1209 | return newstats; |
1210 | } | |
1211 | ||
1212 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
1213 | struct nft_stats __percpu *newstats) | |
1214 | { | |
b88825de PNA |
1215 | if (newstats == NULL) |
1216 | return; | |
1217 | ||
0ca743a5 | 1218 | if (chain->stats) { |
0ca743a5 | 1219 | struct nft_stats __percpu *oldstats = |
67a8fc27 | 1220 | nft_dereference(chain->stats); |
0ca743a5 PNA |
1221 | |
1222 | rcu_assign_pointer(chain->stats, newstats); | |
1223 | synchronize_rcu(); | |
1224 | free_percpu(oldstats); | |
1225 | } else | |
1226 | rcu_assign_pointer(chain->stats, newstats); | |
0ca743a5 PNA |
1227 | } |
1228 | ||
91c7b38d PNA |
1229 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
1230 | { | |
1231 | BUG_ON(chain->use > 0); | |
1232 | ||
1233 | if (chain->flags & NFT_BASE_CHAIN) { | |
2cbce139 PNA |
1234 | struct nft_base_chain *basechain = nft_base_chain(chain); |
1235 | ||
1236 | module_put(basechain->type->owner); | |
1237 | free_percpu(basechain->stats); | |
1238 | if (basechain->ops[0].dev != NULL) | |
1239 | dev_put(basechain->ops[0].dev); | |
1240 | kfree(basechain); | |
91c7b38d PNA |
1241 | } else { |
1242 | kfree(chain); | |
1243 | } | |
1244 | } | |
1245 | ||
508f8ccd PNA |
1246 | struct nft_chain_hook { |
1247 | u32 num; | |
1248 | u32 priority; | |
1249 | const struct nf_chain_type *type; | |
1250 | struct net_device *dev; | |
1251 | }; | |
1252 | ||
1253 | static int nft_chain_parse_hook(struct net *net, | |
1254 | const struct nlattr * const nla[], | |
1255 | struct nft_af_info *afi, | |
1256 | struct nft_chain_hook *hook, bool create) | |
1257 | { | |
1258 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; | |
1259 | const struct nf_chain_type *type; | |
1260 | struct net_device *dev; | |
1261 | int err; | |
1262 | ||
1263 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
1264 | nft_hook_policy); | |
1265 | if (err < 0) | |
1266 | return err; | |
1267 | ||
1268 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1269 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1270 | return -EINVAL; | |
1271 | ||
1272 | hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
1273 | if (hook->num >= afi->nhooks) | |
1274 | return -EINVAL; | |
1275 | ||
1276 | hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); | |
1277 | ||
1278 | type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT]; | |
1279 | if (nla[NFTA_CHAIN_TYPE]) { | |
1280 | type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE], | |
1281 | create); | |
1282 | if (IS_ERR(type)) | |
1283 | return PTR_ERR(type); | |
1284 | } | |
1285 | if (!(type->hook_mask & (1 << hook->num))) | |
1286 | return -EOPNOTSUPP; | |
1287 | if (!try_module_get(type->owner)) | |
1288 | return -ENOENT; | |
1289 | ||
1290 | hook->type = type; | |
1291 | ||
1292 | hook->dev = NULL; | |
1293 | if (afi->flags & NFT_AF_NEEDS_DEV) { | |
1294 | char ifname[IFNAMSIZ]; | |
1295 | ||
1296 | if (!ha[NFTA_HOOK_DEV]) { | |
1297 | module_put(type->owner); | |
1298 | return -EOPNOTSUPP; | |
1299 | } | |
1300 | ||
1301 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); | |
1302 | dev = dev_get_by_name(net, ifname); | |
1303 | if (!dev) { | |
1304 | module_put(type->owner); | |
1305 | return -ENOENT; | |
1306 | } | |
1307 | hook->dev = dev; | |
1308 | } else if (ha[NFTA_HOOK_DEV]) { | |
1309 | module_put(type->owner); | |
1310 | return -EOPNOTSUPP; | |
1311 | } | |
1312 | ||
1313 | return 0; | |
1314 | } | |
1315 | ||
1316 | static void nft_chain_release_hook(struct nft_chain_hook *hook) | |
1317 | { | |
1318 | module_put(hook->type->owner); | |
1319 | if (hook->dev != NULL) | |
1320 | dev_put(hook->dev); | |
1321 | } | |
1322 | ||
633c9a84 PNA |
1323 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
1324 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
1325 | const struct nlattr * const nla[]) |
1326 | { | |
1327 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1328 | const struct nlattr * uninitialized_var(name); | |
7c95f6d8 | 1329 | struct nft_af_info *afi; |
96518518 PM |
1330 | struct nft_table *table; |
1331 | struct nft_chain *chain; | |
0ca743a5 | 1332 | struct nft_base_chain *basechain = NULL; |
f2a6d766 | 1333 | u8 genmask = nft_genmask_next(net); |
96518518 | 1334 | int family = nfmsg->nfgen_family; |
57de2a0c | 1335 | u8 policy = NF_ACCEPT; |
96518518 | 1336 | u64 handle = 0; |
115a60b1 | 1337 | unsigned int i; |
ff3cd7b3 | 1338 | struct nft_stats __percpu *stats; |
96518518 PM |
1339 | int err; |
1340 | bool create; | |
91c7b38d | 1341 | struct nft_ctx ctx; |
96518518 PM |
1342 | |
1343 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1344 | ||
99633ab2 | 1345 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
1346 | if (IS_ERR(afi)) |
1347 | return PTR_ERR(afi); | |
1348 | ||
f2a6d766 | 1349 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1350 | if (IS_ERR(table)) |
1351 | return PTR_ERR(table); | |
1352 | ||
96518518 PM |
1353 | chain = NULL; |
1354 | name = nla[NFTA_CHAIN_NAME]; | |
1355 | ||
1356 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1357 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
664b0f8c | 1358 | chain = nf_tables_chain_lookup_byhandle(table, handle, genmask); |
96518518 PM |
1359 | if (IS_ERR(chain)) |
1360 | return PTR_ERR(chain); | |
1361 | } else { | |
664b0f8c | 1362 | chain = nf_tables_chain_lookup(table, name, genmask); |
96518518 PM |
1363 | if (IS_ERR(chain)) { |
1364 | if (PTR_ERR(chain) != -ENOENT) | |
1365 | return PTR_ERR(chain); | |
1366 | chain = NULL; | |
1367 | } | |
1368 | } | |
1369 | ||
57de2a0c PM |
1370 | if (nla[NFTA_CHAIN_POLICY]) { |
1371 | if ((chain != NULL && | |
d6b6cb1d PNA |
1372 | !(chain->flags & NFT_BASE_CHAIN))) |
1373 | return -EOPNOTSUPP; | |
1374 | ||
1375 | if (chain == NULL && | |
57de2a0c PM |
1376 | nla[NFTA_CHAIN_HOOK] == NULL) |
1377 | return -EOPNOTSUPP; | |
1378 | ||
8f46df18 | 1379 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1380 | switch (policy) { |
1381 | case NF_DROP: | |
1382 | case NF_ACCEPT: | |
1383 | break; | |
1384 | default: | |
1385 | return -EINVAL; | |
1386 | } | |
1387 | } | |
1388 | ||
96518518 | 1389 | if (chain != NULL) { |
91c7b38d PNA |
1390 | struct nft_stats *stats = NULL; |
1391 | struct nft_trans *trans; | |
1392 | ||
96518518 PM |
1393 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
1394 | return -EEXIST; | |
1395 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1396 | return -EOPNOTSUPP; | |
1397 | ||
6133740d PNA |
1398 | if (nla[NFTA_CHAIN_HOOK]) { |
1399 | struct nft_base_chain *basechain; | |
1400 | struct nft_chain_hook hook; | |
1401 | struct nf_hook_ops *ops; | |
1402 | ||
1403 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
1404 | return -EBUSY; | |
1405 | ||
1406 | err = nft_chain_parse_hook(net, nla, afi, &hook, | |
1407 | create); | |
1408 | if (err < 0) | |
1409 | return err; | |
1410 | ||
1411 | basechain = nft_base_chain(chain); | |
1412 | if (basechain->type != hook.type) { | |
1413 | nft_chain_release_hook(&hook); | |
1414 | return -EBUSY; | |
1415 | } | |
1416 | ||
1417 | for (i = 0; i < afi->nops; i++) { | |
1418 | ops = &basechain->ops[i]; | |
1419 | if (ops->hooknum != hook.num || | |
1420 | ops->priority != hook.priority || | |
1421 | ops->dev != hook.dev) { | |
1422 | nft_chain_release_hook(&hook); | |
1423 | return -EBUSY; | |
1424 | } | |
1425 | } | |
1426 | nft_chain_release_hook(&hook); | |
1427 | } | |
1428 | ||
664b0f8c PNA |
1429 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
1430 | struct nft_chain *chain2; | |
1431 | ||
1432 | chain2 = nf_tables_chain_lookup(table, | |
1433 | nla[NFTA_CHAIN_NAME], | |
1434 | genmask); | |
1435 | if (IS_ERR(chain2)) | |
1436 | return PTR_ERR(chain2); | |
1437 | } | |
96518518 | 1438 | |
0ca743a5 PNA |
1439 | if (nla[NFTA_CHAIN_COUNTERS]) { |
1440 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
1441 | return -EOPNOTSUPP; | |
1442 | ||
ff3cd7b3 PNA |
1443 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1444 | if (IS_ERR(stats)) | |
1445 | return PTR_ERR(stats); | |
0ca743a5 PNA |
1446 | } |
1447 | ||
633c9a84 | 1448 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
91c7b38d PNA |
1449 | trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN, |
1450 | sizeof(struct nft_trans_chain)); | |
f5553c19 PNA |
1451 | if (trans == NULL) { |
1452 | free_percpu(stats); | |
91c7b38d | 1453 | return -ENOMEM; |
f5553c19 | 1454 | } |
4401a862 | 1455 | |
91c7b38d PNA |
1456 | nft_trans_chain_stats(trans) = stats; |
1457 | nft_trans_chain_update(trans) = true; | |
4401a862 | 1458 | |
91c7b38d PNA |
1459 | if (nla[NFTA_CHAIN_POLICY]) |
1460 | nft_trans_chain_policy(trans) = policy; | |
1461 | else | |
1462 | nft_trans_chain_policy(trans) = -1; | |
96518518 | 1463 | |
91c7b38d PNA |
1464 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
1465 | nla_strlcpy(nft_trans_chain_name(trans), name, | |
1466 | NFT_CHAIN_MAXNAMELEN); | |
1467 | } | |
1468 | list_add_tail(&trans->list, &net->nft.commit_list); | |
1469 | return 0; | |
96518518 PM |
1470 | } |
1471 | ||
75820676 PM |
1472 | if (table->use == UINT_MAX) |
1473 | return -EOVERFLOW; | |
1474 | ||
96518518 | 1475 | if (nla[NFTA_CHAIN_HOOK]) { |
508f8ccd | 1476 | struct nft_chain_hook hook; |
96518518 | 1477 | struct nf_hook_ops *ops; |
9370761c | 1478 | nf_hookfn *hookfn; |
96518518 | 1479 | |
508f8ccd | 1480 | err = nft_chain_parse_hook(net, nla, afi, &hook, create); |
96518518 PM |
1481 | if (err < 0) |
1482 | return err; | |
2cbce139 | 1483 | |
96518518 | 1484 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
f5553c19 | 1485 | if (basechain == NULL) { |
508f8ccd | 1486 | nft_chain_release_hook(&hook); |
96518518 | 1487 | return -ENOMEM; |
f5553c19 | 1488 | } |
9370761c | 1489 | |
508f8ccd PNA |
1490 | if (hook.dev != NULL) |
1491 | strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ); | |
2cbce139 | 1492 | |
4401a862 | 1493 | if (nla[NFTA_CHAIN_COUNTERS]) { |
ff3cd7b3 PNA |
1494 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1495 | if (IS_ERR(stats)) { | |
508f8ccd | 1496 | nft_chain_release_hook(&hook); |
4401a862 | 1497 | kfree(basechain); |
ff3cd7b3 | 1498 | return PTR_ERR(stats); |
4401a862 | 1499 | } |
ff3cd7b3 | 1500 | basechain->stats = stats; |
4401a862 | 1501 | } else { |
ce355e20 | 1502 | stats = netdev_alloc_pcpu_stats(struct nft_stats); |
c123bb71 | 1503 | if (stats == NULL) { |
508f8ccd | 1504 | nft_chain_release_hook(&hook); |
4401a862 | 1505 | kfree(basechain); |
c123bb71 | 1506 | return -ENOMEM; |
4401a862 | 1507 | } |
ff3cd7b3 | 1508 | rcu_assign_pointer(basechain->stats, stats); |
4401a862 PM |
1509 | } |
1510 | ||
508f8ccd PNA |
1511 | hookfn = hook.type->hooks[hook.num]; |
1512 | basechain->type = hook.type; | |
96518518 PM |
1513 | chain = &basechain->chain; |
1514 | ||
115a60b1 PM |
1515 | for (i = 0; i < afi->nops; i++) { |
1516 | ops = &basechain->ops[i]; | |
1517 | ops->pf = family; | |
508f8ccd PNA |
1518 | ops->hooknum = hook.num; |
1519 | ops->priority = hook.priority; | |
115a60b1 PM |
1520 | ops->priv = chain; |
1521 | ops->hook = afi->hooks[ops->hooknum]; | |
508f8ccd | 1522 | ops->dev = hook.dev; |
115a60b1 PM |
1523 | if (hookfn) |
1524 | ops->hook = hookfn; | |
1525 | if (afi->hook_ops_init) | |
1526 | afi->hook_ops_init(ops, i); | |
1527 | } | |
96518518 PM |
1528 | |
1529 | chain->flags |= NFT_BASE_CHAIN; | |
57de2a0c | 1530 | basechain->policy = policy; |
96518518 PM |
1531 | } else { |
1532 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1533 | if (chain == NULL) | |
1534 | return -ENOMEM; | |
1535 | } | |
1536 | ||
1537 | INIT_LIST_HEAD(&chain->rules); | |
1538 | chain->handle = nf_tables_alloc_handle(table); | |
b5bc89bf | 1539 | chain->table = table; |
96518518 PM |
1540 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
1541 | ||
82bec71d | 1542 | err = nf_tables_register_hooks(net, table, chain, afi->nops); |
d8ee8f7c PNA |
1543 | if (err < 0) |
1544 | goto err1; | |
96518518 | 1545 | |
633c9a84 | 1546 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
91c7b38d PNA |
1547 | err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN); |
1548 | if (err < 0) | |
1549 | goto err2; | |
96518518 | 1550 | |
4fefee57 | 1551 | table->use++; |
e688a7f8 | 1552 | list_add_tail_rcu(&chain->list, &table->chains); |
91c7b38d PNA |
1553 | return 0; |
1554 | err2: | |
82bec71d | 1555 | nf_tables_unregister_hooks(net, table, chain, afi->nops); |
91c7b38d PNA |
1556 | err1: |
1557 | nf_tables_chain_destroy(chain); | |
1558 | return err; | |
96518518 PM |
1559 | } |
1560 | ||
633c9a84 PNA |
1561 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
1562 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
1563 | const struct nlattr * const nla[]) |
1564 | { | |
1565 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1566 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 1567 | struct nft_af_info *afi; |
96518518 PM |
1568 | struct nft_table *table; |
1569 | struct nft_chain *chain; | |
1570 | int family = nfmsg->nfgen_family; | |
91c7b38d | 1571 | struct nft_ctx ctx; |
96518518 | 1572 | |
99633ab2 | 1573 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1574 | if (IS_ERR(afi)) |
1575 | return PTR_ERR(afi); | |
1576 | ||
f2a6d766 | 1577 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1578 | if (IS_ERR(table)) |
1579 | return PTR_ERR(table); | |
1580 | ||
664b0f8c | 1581 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1582 | if (IS_ERR(chain)) |
1583 | return PTR_ERR(chain); | |
4fefee57 | 1584 | if (chain->use > 0) |
96518518 PM |
1585 | return -EBUSY; |
1586 | ||
633c9a84 | 1587 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0165d932 | 1588 | |
ee01d542 | 1589 | return nft_delchain(&ctx); |
96518518 PM |
1590 | } |
1591 | ||
96518518 PM |
1592 | /* |
1593 | * Expressions | |
1594 | */ | |
1595 | ||
1596 | /** | |
ef1f7df9 PM |
1597 | * nft_register_expr - register nf_tables expr type |
1598 | * @ops: expr type | |
96518518 | 1599 | * |
ef1f7df9 | 1600 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1601 | * success or a negative errno code otherwise. |
1602 | */ | |
ef1f7df9 | 1603 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1604 | { |
1605 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1606 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1607 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1608 | else |
e688a7f8 | 1609 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1610 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1611 | return 0; | |
1612 | } | |
1613 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1614 | ||
1615 | /** | |
ef1f7df9 PM |
1616 | * nft_unregister_expr - unregister nf_tables expr type |
1617 | * @ops: expr type | |
96518518 | 1618 | * |
ef1f7df9 | 1619 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1620 | */ |
ef1f7df9 | 1621 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1622 | { |
1623 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1624 | list_del_rcu(&type->list); |
96518518 PM |
1625 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1626 | } | |
1627 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1628 | ||
64d46806 PM |
1629 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1630 | struct nlattr *nla) | |
96518518 | 1631 | { |
ef1f7df9 | 1632 | const struct nft_expr_type *type; |
96518518 | 1633 | |
ef1f7df9 | 1634 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1635 | if (!nla_strcmp(nla, type->name) && |
1636 | (!type->family || type->family == family)) | |
ef1f7df9 | 1637 | return type; |
96518518 PM |
1638 | } |
1639 | return NULL; | |
1640 | } | |
1641 | ||
64d46806 PM |
1642 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1643 | struct nlattr *nla) | |
96518518 | 1644 | { |
ef1f7df9 | 1645 | const struct nft_expr_type *type; |
96518518 PM |
1646 | |
1647 | if (nla == NULL) | |
1648 | return ERR_PTR(-EINVAL); | |
1649 | ||
64d46806 | 1650 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1651 | if (type != NULL && try_module_get(type->owner)) |
1652 | return type; | |
96518518 PM |
1653 | |
1654 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1655 | if (type == NULL) { |
64d46806 PM |
1656 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1657 | request_module("nft-expr-%u-%.*s", family, | |
1658 | nla_len(nla), (char *)nla_data(nla)); | |
1659 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1660 | if (__nft_expr_type_get(family, nla)) | |
1661 | return ERR_PTR(-EAGAIN); | |
1662 | ||
96518518 PM |
1663 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1664 | request_module("nft-expr-%.*s", | |
1665 | nla_len(nla), (char *)nla_data(nla)); | |
1666 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1667 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1668 | return ERR_PTR(-EAGAIN); |
1669 | } | |
1670 | #endif | |
1671 | return ERR_PTR(-ENOENT); | |
1672 | } | |
1673 | ||
1674 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1675 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1676 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1677 | }; | |
1678 | ||
1679 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1680 | const struct nft_expr *expr) | |
1681 | { | |
ef1f7df9 | 1682 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1683 | goto nla_put_failure; |
1684 | ||
1685 | if (expr->ops->dump) { | |
1686 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1687 | if (data == NULL) | |
1688 | goto nla_put_failure; | |
1689 | if (expr->ops->dump(skb, expr) < 0) | |
1690 | goto nla_put_failure; | |
1691 | nla_nest_end(skb, data); | |
1692 | } | |
1693 | ||
1694 | return skb->len; | |
1695 | ||
1696 | nla_put_failure: | |
1697 | return -1; | |
1698 | }; | |
1699 | ||
0b2d8a7b PM |
1700 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
1701 | const struct nft_expr *expr) | |
1702 | { | |
1703 | struct nlattr *nest; | |
1704 | ||
1705 | nest = nla_nest_start(skb, attr); | |
1706 | if (!nest) | |
1707 | goto nla_put_failure; | |
1708 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1709 | goto nla_put_failure; | |
1710 | nla_nest_end(skb, nest); | |
1711 | return 0; | |
1712 | ||
1713 | nla_put_failure: | |
1714 | return -1; | |
1715 | } | |
1716 | ||
96518518 PM |
1717 | struct nft_expr_info { |
1718 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1719 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1720 | }; |
1721 | ||
0ca743a5 PNA |
1722 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1723 | const struct nlattr *nla, | |
96518518 PM |
1724 | struct nft_expr_info *info) |
1725 | { | |
ef1f7df9 | 1726 | const struct nft_expr_type *type; |
96518518 | 1727 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1728 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1729 | int err; |
1730 | ||
ef1f7df9 | 1731 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
96518518 PM |
1732 | if (err < 0) |
1733 | return err; | |
1734 | ||
64d46806 | 1735 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1736 | if (IS_ERR(type)) |
1737 | return PTR_ERR(type); | |
1738 | ||
1739 | if (tb[NFTA_EXPR_DATA]) { | |
1740 | err = nla_parse_nested(info->tb, type->maxattr, | |
1741 | tb[NFTA_EXPR_DATA], type->policy); | |
1742 | if (err < 0) | |
1743 | goto err1; | |
1744 | } else | |
1745 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1746 | ||
1747 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1748 | ops = type->select_ops(ctx, |
1749 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1750 | if (IS_ERR(ops)) { |
1751 | err = PTR_ERR(ops); | |
1752 | goto err1; | |
1753 | } | |
1754 | } else | |
1755 | ops = type->ops; | |
1756 | ||
96518518 PM |
1757 | info->ops = ops; |
1758 | return 0; | |
ef1f7df9 PM |
1759 | |
1760 | err1: | |
1761 | module_put(type->owner); | |
1762 | return err; | |
96518518 PM |
1763 | } |
1764 | ||
1765 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1766 | const struct nft_expr_info *info, |
96518518 PM |
1767 | struct nft_expr *expr) |
1768 | { | |
1769 | const struct nft_expr_ops *ops = info->ops; | |
1770 | int err; | |
1771 | ||
1772 | expr->ops = ops; | |
1773 | if (ops->init) { | |
ef1f7df9 | 1774 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1775 | if (err < 0) |
1776 | goto err1; | |
1777 | } | |
1778 | ||
96518518 PM |
1779 | return 0; |
1780 | ||
1781 | err1: | |
1782 | expr->ops = NULL; | |
1783 | return err; | |
1784 | } | |
1785 | ||
62472bce PM |
1786 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1787 | struct nft_expr *expr) | |
96518518 PM |
1788 | { |
1789 | if (expr->ops->destroy) | |
62472bce | 1790 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1791 | module_put(expr->ops->type->owner); |
96518518 PM |
1792 | } |
1793 | ||
0b2d8a7b PM |
1794 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
1795 | const struct nlattr *nla) | |
1796 | { | |
1797 | struct nft_expr_info info; | |
1798 | struct nft_expr *expr; | |
1799 | int err; | |
1800 | ||
1801 | err = nf_tables_expr_parse(ctx, nla, &info); | |
1802 | if (err < 0) | |
1803 | goto err1; | |
1804 | ||
1805 | err = -ENOMEM; | |
1806 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
1807 | if (expr == NULL) | |
1808 | goto err2; | |
1809 | ||
1810 | err = nf_tables_newexpr(ctx, &info, expr); | |
1811 | if (err < 0) | |
6cafaf47 | 1812 | goto err3; |
0b2d8a7b PM |
1813 | |
1814 | return expr; | |
6cafaf47 LZ |
1815 | err3: |
1816 | kfree(expr); | |
0b2d8a7b PM |
1817 | err2: |
1818 | module_put(info.ops->type->owner); | |
1819 | err1: | |
1820 | return ERR_PTR(err); | |
1821 | } | |
1822 | ||
1823 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
1824 | { | |
1825 | nf_tables_expr_destroy(ctx, expr); | |
1826 | kfree(expr); | |
1827 | } | |
1828 | ||
96518518 PM |
1829 | /* |
1830 | * Rules | |
1831 | */ | |
1832 | ||
1833 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1834 | u64 handle) | |
1835 | { | |
1836 | struct nft_rule *rule; | |
1837 | ||
1838 | // FIXME: this sucks | |
1839 | list_for_each_entry(rule, &chain->rules, list) { | |
1840 | if (handle == rule->handle) | |
1841 | return rule; | |
1842 | } | |
1843 | ||
1844 | return ERR_PTR(-ENOENT); | |
1845 | } | |
1846 | ||
1847 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1848 | const struct nlattr *nla) | |
1849 | { | |
1850 | if (nla == NULL) | |
1851 | return ERR_PTR(-EINVAL); | |
1852 | ||
1853 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1854 | } | |
1855 | ||
1856 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
b2fbd044 LZ |
1857 | [NFTA_RULE_TABLE] = { .type = NLA_STRING, |
1858 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
1859 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
1860 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1861 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1862 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1863 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1864 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1865 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1866 | .len = NFT_USERDATA_MAXLEN }, | |
96518518 PM |
1867 | }; |
1868 | ||
84d7fce6 PNA |
1869 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
1870 | u32 portid, u32 seq, int event, | |
1871 | u32 flags, int family, | |
96518518 PM |
1872 | const struct nft_table *table, |
1873 | const struct nft_chain *chain, | |
1874 | const struct nft_rule *rule) | |
1875 | { | |
1876 | struct nlmsghdr *nlh; | |
1877 | struct nfgenmsg *nfmsg; | |
1878 | const struct nft_expr *expr, *next; | |
1879 | struct nlattr *list; | |
5e948466 EL |
1880 | const struct nft_rule *prule; |
1881 | int type = event | NFNL_SUBSYS_NFTABLES << 8; | |
96518518 | 1882 | |
5e948466 | 1883 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
96518518 PM |
1884 | flags); |
1885 | if (nlh == NULL) | |
1886 | goto nla_put_failure; | |
1887 | ||
1888 | nfmsg = nlmsg_data(nlh); | |
1889 | nfmsg->nfgen_family = family; | |
1890 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1891 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1892 | |
1893 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1894 | goto nla_put_failure; | |
1895 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1896 | goto nla_put_failure; | |
b46f6ded ND |
1897 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), |
1898 | NFTA_RULE_PAD)) | |
96518518 PM |
1899 | goto nla_put_failure; |
1900 | ||
5e948466 EL |
1901 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
1902 | prule = list_entry(rule->list.prev, struct nft_rule, list); | |
1903 | if (nla_put_be64(skb, NFTA_RULE_POSITION, | |
b46f6ded ND |
1904 | cpu_to_be64(prule->handle), |
1905 | NFTA_RULE_PAD)) | |
5e948466 EL |
1906 | goto nla_put_failure; |
1907 | } | |
1908 | ||
96518518 PM |
1909 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
1910 | if (list == NULL) | |
1911 | goto nla_put_failure; | |
1912 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 1913 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 1914 | goto nla_put_failure; |
96518518 PM |
1915 | } |
1916 | nla_nest_end(skb, list); | |
1917 | ||
86f1ec32 PM |
1918 | if (rule->udata) { |
1919 | struct nft_userdata *udata = nft_userdata(rule); | |
1920 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
1921 | udata->data) < 0) | |
1922 | goto nla_put_failure; | |
1923 | } | |
0768b3b3 | 1924 | |
053c095a JB |
1925 | nlmsg_end(skb, nlh); |
1926 | return 0; | |
96518518 PM |
1927 | |
1928 | nla_put_failure: | |
1929 | nlmsg_trim(skb, nlh); | |
1930 | return -1; | |
1931 | } | |
1932 | ||
35151d84 | 1933 | static int nf_tables_rule_notify(const struct nft_ctx *ctx, |
96518518 | 1934 | const struct nft_rule *rule, |
35151d84 | 1935 | int event) |
96518518 PM |
1936 | { |
1937 | struct sk_buff *skb; | |
96518518 PM |
1938 | int err; |
1939 | ||
128ad332 PNA |
1940 | if (!ctx->report && |
1941 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
1942 | return 0; |
1943 | ||
1944 | err = -ENOBUFS; | |
1945 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1946 | if (skb == NULL) | |
1947 | goto err; | |
1948 | ||
84d7fce6 PNA |
1949 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
1950 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1951 | ctx->chain, rule); |
96518518 PM |
1952 | if (err < 0) { |
1953 | kfree_skb(skb); | |
1954 | goto err; | |
1955 | } | |
1956 | ||
128ad332 PNA |
1957 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1958 | ctx->report, GFP_KERNEL); | |
96518518 | 1959 | err: |
128ad332 PNA |
1960 | if (err < 0) { |
1961 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
1962 | err); | |
1963 | } | |
96518518 PM |
1964 | return err; |
1965 | } | |
1966 | ||
6e1f760e PNA |
1967 | struct nft_rule_dump_ctx { |
1968 | char table[NFT_TABLE_MAXNAMELEN]; | |
1969 | char chain[NFT_CHAIN_MAXNAMELEN]; | |
1970 | }; | |
1971 | ||
96518518 PM |
1972 | static int nf_tables_dump_rules(struct sk_buff *skb, |
1973 | struct netlink_callback *cb) | |
1974 | { | |
1975 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
6e1f760e | 1976 | const struct nft_rule_dump_ctx *ctx = cb->data; |
96518518 PM |
1977 | const struct nft_af_info *afi; |
1978 | const struct nft_table *table; | |
1979 | const struct nft_chain *chain; | |
1980 | const struct nft_rule *rule; | |
1981 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1982 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1983 | int family = nfmsg->nfgen_family; |
1984 | ||
e688a7f8 | 1985 | rcu_read_lock(); |
38e029f1 PNA |
1986 | cb->seq = net->nft.base_seq; |
1987 | ||
e688a7f8 | 1988 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1989 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1990 | continue; | |
1991 | ||
e688a7f8 | 1992 | list_for_each_entry_rcu(table, &afi->tables, list) { |
6e1f760e PNA |
1993 | if (ctx && ctx->table[0] && |
1994 | strcmp(ctx->table, table->name) != 0) | |
1995 | continue; | |
1996 | ||
e688a7f8 | 1997 | list_for_each_entry_rcu(chain, &table->chains, list) { |
6e1f760e PNA |
1998 | if (ctx && ctx->chain[0] && |
1999 | strcmp(ctx->chain, chain->name) != 0) | |
2000 | continue; | |
2001 | ||
e688a7f8 | 2002 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
889f7ee7 | 2003 | if (!nft_is_active(net, rule)) |
0628b123 | 2004 | goto cont; |
96518518 PM |
2005 | if (idx < s_idx) |
2006 | goto cont; | |
2007 | if (idx > s_idx) | |
2008 | memset(&cb->args[1], 0, | |
2009 | sizeof(cb->args) - sizeof(cb->args[0])); | |
84d7fce6 | 2010 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, |
96518518 PM |
2011 | cb->nlh->nlmsg_seq, |
2012 | NFT_MSG_NEWRULE, | |
2013 | NLM_F_MULTI | NLM_F_APPEND, | |
2014 | afi->family, table, chain, rule) < 0) | |
2015 | goto done; | |
38e029f1 PNA |
2016 | |
2017 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
2018 | cont: |
2019 | idx++; | |
2020 | } | |
2021 | } | |
2022 | } | |
2023 | } | |
2024 | done: | |
e688a7f8 PNA |
2025 | rcu_read_unlock(); |
2026 | ||
96518518 PM |
2027 | cb->args[0] = idx; |
2028 | return skb->len; | |
2029 | } | |
2030 | ||
6e1f760e PNA |
2031 | static int nf_tables_dump_rules_done(struct netlink_callback *cb) |
2032 | { | |
2033 | kfree(cb->data); | |
2034 | return 0; | |
2035 | } | |
2036 | ||
7b8002a1 PNA |
2037 | static int nf_tables_getrule(struct net *net, struct sock *nlsk, |
2038 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
2039 | const struct nlattr * const nla[]) |
2040 | { | |
2041 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2042 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
2043 | const struct nft_af_info *afi; |
2044 | const struct nft_table *table; | |
2045 | const struct nft_chain *chain; | |
2046 | const struct nft_rule *rule; | |
2047 | struct sk_buff *skb2; | |
2048 | int family = nfmsg->nfgen_family; | |
2049 | int err; | |
2050 | ||
2051 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2052 | struct netlink_dump_control c = { | |
2053 | .dump = nf_tables_dump_rules, | |
6e1f760e | 2054 | .done = nf_tables_dump_rules_done, |
96518518 | 2055 | }; |
6e1f760e PNA |
2056 | |
2057 | if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { | |
2058 | struct nft_rule_dump_ctx *ctx; | |
2059 | ||
2060 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
2061 | if (!ctx) | |
2062 | return -ENOMEM; | |
2063 | ||
2064 | if (nla[NFTA_RULE_TABLE]) | |
2065 | nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE], | |
2066 | sizeof(ctx->table)); | |
2067 | if (nla[NFTA_RULE_CHAIN]) | |
2068 | nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN], | |
2069 | sizeof(ctx->chain)); | |
2070 | c.data = ctx; | |
2071 | } | |
2072 | ||
96518518 PM |
2073 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2074 | } | |
2075 | ||
99633ab2 | 2076 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2077 | if (IS_ERR(afi)) |
2078 | return PTR_ERR(afi); | |
2079 | ||
f2a6d766 | 2080 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2081 | if (IS_ERR(table)) |
2082 | return PTR_ERR(table); | |
2083 | ||
664b0f8c | 2084 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2085 | if (IS_ERR(chain)) |
2086 | return PTR_ERR(chain); | |
2087 | ||
2088 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
2089 | if (IS_ERR(rule)) | |
2090 | return PTR_ERR(rule); | |
2091 | ||
2092 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2093 | if (!skb2) | |
2094 | return -ENOMEM; | |
2095 | ||
84d7fce6 | 2096 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
2097 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
2098 | family, table, chain, rule); | |
2099 | if (err < 0) | |
2100 | goto err; | |
2101 | ||
2102 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2103 | ||
2104 | err: | |
2105 | kfree_skb(skb2); | |
2106 | return err; | |
2107 | } | |
2108 | ||
62472bce PM |
2109 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
2110 | struct nft_rule *rule) | |
96518518 | 2111 | { |
96518518 PM |
2112 | struct nft_expr *expr; |
2113 | ||
2114 | /* | |
2115 | * Careful: some expressions might not be initialized in case this | |
2116 | * is called on error from nf_tables_newrule(). | |
2117 | */ | |
2118 | expr = nft_expr_first(rule); | |
3e38df13 | 2119 | while (expr != nft_expr_last(rule) && expr->ops) { |
62472bce | 2120 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
2121 | expr = nft_expr_next(expr); |
2122 | } | |
2123 | kfree(rule); | |
2124 | } | |
2125 | ||
1081d11b PNA |
2126 | #define NFT_RULE_MAXEXPRS 128 |
2127 | ||
2128 | static struct nft_expr_info *info; | |
2129 | ||
633c9a84 PNA |
2130 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
2131 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
2132 | const struct nlattr * const nla[]) |
2133 | { | |
2134 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2135 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2136 | struct nft_af_info *afi; |
96518518 PM |
2137 | struct nft_table *table; |
2138 | struct nft_chain *chain; | |
2139 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 2140 | struct nft_userdata *udata; |
1081d11b | 2141 | struct nft_trans *trans = NULL; |
96518518 PM |
2142 | struct nft_expr *expr; |
2143 | struct nft_ctx ctx; | |
2144 | struct nlattr *tmp; | |
86f1ec32 | 2145 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 PM |
2146 | int err, rem; |
2147 | bool create; | |
5e948466 | 2148 | u64 handle, pos_handle; |
96518518 PM |
2149 | |
2150 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
2151 | ||
99633ab2 | 2152 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
2153 | if (IS_ERR(afi)) |
2154 | return PTR_ERR(afi); | |
2155 | ||
f2a6d766 | 2156 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2157 | if (IS_ERR(table)) |
2158 | return PTR_ERR(table); | |
2159 | ||
664b0f8c | 2160 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2161 | if (IS_ERR(chain)) |
2162 | return PTR_ERR(chain); | |
2163 | ||
2164 | if (nla[NFTA_RULE_HANDLE]) { | |
2165 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
2166 | rule = __nf_tables_rule_lookup(chain, handle); | |
2167 | if (IS_ERR(rule)) | |
2168 | return PTR_ERR(rule); | |
2169 | ||
2170 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2171 | return -EEXIST; | |
2172 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2173 | old_rule = rule; | |
2174 | else | |
2175 | return -EOPNOTSUPP; | |
2176 | } else { | |
2177 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
2178 | return -EINVAL; | |
2179 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
2180 | |
2181 | if (chain->use == UINT_MAX) | |
2182 | return -EOVERFLOW; | |
96518518 PM |
2183 | } |
2184 | ||
5e948466 EL |
2185 | if (nla[NFTA_RULE_POSITION]) { |
2186 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2187 | return -EOPNOTSUPP; | |
2188 | ||
2189 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
2190 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
2191 | if (IS_ERR(old_rule)) | |
2192 | return PTR_ERR(old_rule); | |
2193 | } | |
2194 | ||
633c9a84 | 2195 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0ca743a5 | 2196 | |
96518518 PM |
2197 | n = 0; |
2198 | size = 0; | |
2199 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2200 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
2201 | err = -EINVAL; | |
2202 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2203 | goto err1; | |
2204 | if (n == NFT_RULE_MAXEXPRS) | |
2205 | goto err1; | |
0ca743a5 | 2206 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2207 | if (err < 0) |
2208 | goto err1; | |
2209 | size += info[n].ops->size; | |
2210 | n++; | |
2211 | } | |
2212 | } | |
9889840f PM |
2213 | /* Check for overflow of dlen field */ |
2214 | err = -EFBIG; | |
2215 | if (size >= 1 << 12) | |
2216 | goto err1; | |
96518518 | 2217 | |
86f1ec32 | 2218 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2219 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2220 | if (ulen > 0) |
2221 | usize = sizeof(struct nft_userdata) + ulen; | |
2222 | } | |
0768b3b3 | 2223 | |
96518518 | 2224 | err = -ENOMEM; |
86f1ec32 | 2225 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2226 | if (rule == NULL) |
2227 | goto err1; | |
2228 | ||
889f7ee7 | 2229 | nft_activate_next(net, rule); |
0628b123 | 2230 | |
96518518 PM |
2231 | rule->handle = handle; |
2232 | rule->dlen = size; | |
86f1ec32 | 2233 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2234 | |
86f1ec32 PM |
2235 | if (ulen) { |
2236 | udata = nft_userdata(rule); | |
2237 | udata->len = ulen - 1; | |
2238 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2239 | } | |
96518518 | 2240 | |
96518518 PM |
2241 | expr = nft_expr_first(rule); |
2242 | for (i = 0; i < n; i++) { | |
2243 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2244 | if (err < 0) | |
2245 | goto err2; | |
ef1f7df9 | 2246 | info[i].ops = NULL; |
96518518 PM |
2247 | expr = nft_expr_next(expr); |
2248 | } | |
2249 | ||
96518518 | 2250 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
889f7ee7 | 2251 | if (nft_is_active_next(net, old_rule)) { |
ac904ac8 | 2252 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
b380e5c7 | 2253 | old_rule); |
1081d11b | 2254 | if (trans == NULL) { |
0628b123 PNA |
2255 | err = -ENOMEM; |
2256 | goto err2; | |
2257 | } | |
889f7ee7 | 2258 | nft_deactivate_next(net, old_rule); |
ac34b861 | 2259 | chain->use--; |
5bc5c307 | 2260 | list_add_tail_rcu(&rule->list, &old_rule->list); |
0628b123 PNA |
2261 | } else { |
2262 | err = -ENOENT; | |
2263 | goto err2; | |
2264 | } | |
96518518 | 2265 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
2266 | if (old_rule) |
2267 | list_add_rcu(&rule->list, &old_rule->list); | |
2268 | else | |
2269 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2270 | else { | |
2271 | if (old_rule) | |
2272 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2273 | else | |
2274 | list_add_rcu(&rule->list, &chain->rules); | |
2275 | } | |
96518518 | 2276 | |
b380e5c7 | 2277 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
0628b123 PNA |
2278 | err = -ENOMEM; |
2279 | goto err3; | |
2280 | } | |
4fefee57 | 2281 | chain->use++; |
96518518 PM |
2282 | return 0; |
2283 | ||
0628b123 PNA |
2284 | err3: |
2285 | list_del_rcu(&rule->list); | |
96518518 | 2286 | err2: |
62472bce | 2287 | nf_tables_rule_destroy(&ctx, rule); |
96518518 PM |
2288 | err1: |
2289 | for (i = 0; i < n; i++) { | |
2290 | if (info[i].ops != NULL) | |
ef1f7df9 | 2291 | module_put(info[i].ops->type->owner); |
96518518 PM |
2292 | } |
2293 | return err; | |
2294 | } | |
2295 | ||
633c9a84 PNA |
2296 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
2297 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
96518518 PM |
2298 | const struct nlattr * const nla[]) |
2299 | { | |
2300 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2301 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2302 | struct nft_af_info *afi; |
7c95f6d8 | 2303 | struct nft_table *table; |
cf9dc09d PNA |
2304 | struct nft_chain *chain = NULL; |
2305 | struct nft_rule *rule; | |
0628b123 PNA |
2306 | int family = nfmsg->nfgen_family, err = 0; |
2307 | struct nft_ctx ctx; | |
96518518 | 2308 | |
99633ab2 | 2309 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2310 | if (IS_ERR(afi)) |
2311 | return PTR_ERR(afi); | |
2312 | ||
f2a6d766 | 2313 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2314 | if (IS_ERR(table)) |
2315 | return PTR_ERR(table); | |
2316 | ||
cf9dc09d | 2317 | if (nla[NFTA_RULE_CHAIN]) { |
664b0f8c PNA |
2318 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], |
2319 | genmask); | |
cf9dc09d PNA |
2320 | if (IS_ERR(chain)) |
2321 | return PTR_ERR(chain); | |
2322 | } | |
96518518 | 2323 | |
633c9a84 | 2324 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0628b123 | 2325 | |
cf9dc09d PNA |
2326 | if (chain) { |
2327 | if (nla[NFTA_RULE_HANDLE]) { | |
2328 | rule = nf_tables_rule_lookup(chain, | |
2329 | nla[NFTA_RULE_HANDLE]); | |
2330 | if (IS_ERR(rule)) | |
2331 | return PTR_ERR(rule); | |
96518518 | 2332 | |
5e266fe7 | 2333 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2334 | } else { |
ce24b721 | 2335 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2336 | } |
2337 | } else { | |
2338 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
2339 | if (!nft_is_active_next(net, chain)) |
2340 | continue; | |
2341 | ||
cf9dc09d | 2342 | ctx.chain = chain; |
ce24b721 | 2343 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2344 | if (err < 0) |
2345 | break; | |
2346 | } | |
2347 | } | |
2348 | ||
2349 | return err; | |
2350 | } | |
2351 | ||
20a69341 PM |
2352 | /* |
2353 | * Sets | |
2354 | */ | |
2355 | ||
2356 | static LIST_HEAD(nf_tables_set_ops); | |
2357 | ||
2358 | int nft_register_set(struct nft_set_ops *ops) | |
2359 | { | |
2360 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 2361 | list_add_tail_rcu(&ops->list, &nf_tables_set_ops); |
20a69341 PM |
2362 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2363 | return 0; | |
2364 | } | |
2365 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2366 | ||
2367 | void nft_unregister_set(struct nft_set_ops *ops) | |
2368 | { | |
2369 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 2370 | list_del_rcu(&ops->list); |
20a69341 PM |
2371 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2372 | } | |
2373 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2374 | ||
c50b960c PM |
2375 | /* |
2376 | * Select a set implementation based on the data characteristics and the | |
2377 | * given policy. The total memory use might not be known if no size is | |
2378 | * given, in that case the amount of memory per element is used. | |
2379 | */ | |
2380 | static const struct nft_set_ops * | |
2381 | nft_select_set_ops(const struct nlattr * const nla[], | |
2382 | const struct nft_set_desc *desc, | |
2383 | enum nft_set_policies policy) | |
20a69341 | 2384 | { |
c50b960c PM |
2385 | const struct nft_set_ops *ops, *bops; |
2386 | struct nft_set_estimate est, best; | |
20a69341 PM |
2387 | u32 features; |
2388 | ||
2389 | #ifdef CONFIG_MODULES | |
2390 | if (list_empty(&nf_tables_set_ops)) { | |
2391 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
2392 | request_module("nft-set"); | |
2393 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2394 | if (!list_empty(&nf_tables_set_ops)) | |
2395 | return ERR_PTR(-EAGAIN); | |
2396 | } | |
2397 | #endif | |
2398 | features = 0; | |
2399 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2400 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
4a8678ef | 2401 | features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT; |
20a69341 PM |
2402 | } |
2403 | ||
c50b960c PM |
2404 | bops = NULL; |
2405 | best.size = ~0; | |
2406 | best.class = ~0; | |
2407 | ||
20a69341 PM |
2408 | list_for_each_entry(ops, &nf_tables_set_ops, list) { |
2409 | if ((ops->features & features) != features) | |
2410 | continue; | |
c50b960c PM |
2411 | if (!ops->estimate(desc, features, &est)) |
2412 | continue; | |
2413 | ||
2414 | switch (policy) { | |
2415 | case NFT_SET_POL_PERFORMANCE: | |
2416 | if (est.class < best.class) | |
2417 | break; | |
2418 | if (est.class == best.class && est.size < best.size) | |
2419 | break; | |
2420 | continue; | |
2421 | case NFT_SET_POL_MEMORY: | |
2422 | if (est.size < best.size) | |
2423 | break; | |
2424 | if (est.size == best.size && est.class < best.class) | |
2425 | break; | |
2426 | continue; | |
2427 | default: | |
2428 | break; | |
2429 | } | |
2430 | ||
20a69341 PM |
2431 | if (!try_module_get(ops->owner)) |
2432 | continue; | |
c50b960c PM |
2433 | if (bops != NULL) |
2434 | module_put(bops->owner); | |
2435 | ||
2436 | bops = ops; | |
2437 | best = est; | |
20a69341 PM |
2438 | } |
2439 | ||
c50b960c PM |
2440 | if (bops != NULL) |
2441 | return bops; | |
2442 | ||
20a69341 PM |
2443 | return ERR_PTR(-EOPNOTSUPP); |
2444 | } | |
2445 | ||
2446 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
b2fbd044 LZ |
2447 | [NFTA_SET_TABLE] = { .type = NLA_STRING, |
2448 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
a9bdd836 | 2449 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
cb39ad8b | 2450 | .len = NFT_SET_MAXNAMELEN - 1 }, |
20a69341 PM |
2451 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2452 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2453 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2454 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2455 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2456 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2457 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2458 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2459 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2460 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
e6d8ecac CFG |
2461 | [NFTA_SET_USERDATA] = { .type = NLA_BINARY, |
2462 | .len = NFT_USERDATA_MAXLEN }, | |
8aeff920 | 2463 | [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, |
c50b960c PM |
2464 | }; |
2465 | ||
2466 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2467 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2468 | }; |
2469 | ||
633c9a84 | 2470 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
2471 | const struct sk_buff *skb, |
2472 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
2473 | const struct nlattr * const nla[], |
2474 | u8 genmask) | |
20a69341 PM |
2475 | { |
2476 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
2477 | struct nft_af_info *afi = NULL; |
2478 | struct nft_table *table = NULL; | |
20a69341 | 2479 | |
c9c8e485 PNA |
2480 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
2481 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
2482 | if (IS_ERR(afi)) | |
2483 | return PTR_ERR(afi); | |
2484 | } | |
20a69341 PM |
2485 | |
2486 | if (nla[NFTA_SET_TABLE] != NULL) { | |
ec2c9935 PM |
2487 | if (afi == NULL) |
2488 | return -EAFNOSUPPORT; | |
2489 | ||
f2a6d766 PNA |
2490 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], |
2491 | genmask); | |
20a69341 PM |
2492 | if (IS_ERR(table)) |
2493 | return PTR_ERR(table); | |
2494 | } | |
2495 | ||
633c9a84 | 2496 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2497 | return 0; |
2498 | } | |
2499 | ||
2500 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, | |
37a9cc52 | 2501 | const struct nlattr *nla, u8 genmask) |
20a69341 PM |
2502 | { |
2503 | struct nft_set *set; | |
2504 | ||
2505 | if (nla == NULL) | |
2506 | return ERR_PTR(-EINVAL); | |
2507 | ||
2508 | list_for_each_entry(set, &table->sets, list) { | |
37a9cc52 PNA |
2509 | if (!nla_strcmp(nla, set->name) && |
2510 | nft_active_genmask(set, genmask)) | |
20a69341 PM |
2511 | return set; |
2512 | } | |
2513 | return ERR_PTR(-ENOENT); | |
2514 | } | |
63aea290 | 2515 | EXPORT_SYMBOL_GPL(nf_tables_set_lookup); |
20a69341 | 2516 | |
958bee14 | 2517 | struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
37a9cc52 PNA |
2518 | const struct nlattr *nla, |
2519 | u8 genmask) | |
958bee14 PNA |
2520 | { |
2521 | struct nft_trans *trans; | |
2522 | u32 id = ntohl(nla_get_be32(nla)); | |
2523 | ||
2524 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
37a9cc52 PNA |
2525 | struct nft_set *set = nft_trans_set(trans); |
2526 | ||
958bee14 | 2527 | if (trans->msg_type == NFT_MSG_NEWSET && |
37a9cc52 PNA |
2528 | id == nft_trans_set_id(trans) && |
2529 | nft_active_genmask(set, genmask)) | |
2530 | return set; | |
958bee14 PNA |
2531 | } |
2532 | return ERR_PTR(-ENOENT); | |
2533 | } | |
63aea290 | 2534 | EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid); |
958bee14 | 2535 | |
20a69341 PM |
2536 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
2537 | const char *name) | |
2538 | { | |
2539 | const struct nft_set *i; | |
2540 | const char *p; | |
2541 | unsigned long *inuse; | |
60eb1894 | 2542 | unsigned int n = 0, min = 0; |
20a69341 | 2543 | |
cb39ad8b | 2544 | p = strnchr(name, NFT_SET_MAXNAMELEN, '%'); |
20a69341 PM |
2545 | if (p != NULL) { |
2546 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2547 | return -EINVAL; | |
2548 | ||
2549 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2550 | if (inuse == NULL) | |
2551 | return -ENOMEM; | |
60eb1894 | 2552 | cont: |
20a69341 | 2553 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2554 | int tmp; |
2555 | ||
37a9cc52 PNA |
2556 | if (!nft_is_active_next(ctx->net, set)) |
2557 | continue; | |
14662917 | 2558 | if (!sscanf(i->name, name, &tmp)) |
20a69341 | 2559 | continue; |
60eb1894 | 2560 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2561 | continue; |
14662917 | 2562 | |
60eb1894 | 2563 | set_bit(tmp - min, inuse); |
20a69341 PM |
2564 | } |
2565 | ||
53b70287 | 2566 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2567 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2568 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2569 | memset(inuse, 0, PAGE_SIZE); | |
2570 | goto cont; | |
2571 | } | |
20a69341 PM |
2572 | free_page((unsigned long)inuse); |
2573 | } | |
2574 | ||
60eb1894 | 2575 | snprintf(set->name, sizeof(set->name), name, min + n); |
20a69341 | 2576 | list_for_each_entry(i, &ctx->table->sets, list) { |
37a9cc52 PNA |
2577 | if (!nft_is_active_next(ctx->net, i)) |
2578 | continue; | |
20a69341 PM |
2579 | if (!strcmp(set->name, i->name)) |
2580 | return -ENFILE; | |
2581 | } | |
2582 | return 0; | |
2583 | } | |
2584 | ||
2585 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2586 | const struct nft_set *set, u16 event, u16 flags) | |
2587 | { | |
2588 | struct nfgenmsg *nfmsg; | |
2589 | struct nlmsghdr *nlh; | |
c50b960c | 2590 | struct nlattr *desc; |
128ad332 PNA |
2591 | u32 portid = ctx->portid; |
2592 | u32 seq = ctx->seq; | |
20a69341 PM |
2593 | |
2594 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2595 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2596 | flags); | |
2597 | if (nlh == NULL) | |
2598 | goto nla_put_failure; | |
2599 | ||
2600 | nfmsg = nlmsg_data(nlh); | |
2601 | nfmsg->nfgen_family = ctx->afi->family; | |
2602 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2603 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
2604 | |
2605 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2606 | goto nla_put_failure; | |
2607 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2608 | goto nla_put_failure; | |
2609 | if (set->flags != 0) | |
2610 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2611 | goto nla_put_failure; | |
2612 | ||
2613 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2614 | goto nla_put_failure; | |
2615 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2616 | goto nla_put_failure; | |
2617 | if (set->flags & NFT_SET_MAP) { | |
2618 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2619 | goto nla_put_failure; | |
2620 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2621 | goto nla_put_failure; | |
2622 | } | |
8aeff920 PNA |
2623 | if (set->flags & NFT_SET_OBJECT && |
2624 | nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) | |
2625 | goto nla_put_failure; | |
20a69341 | 2626 | |
761da293 | 2627 | if (set->timeout && |
d3e2a111 AP |
2628 | nla_put_be64(skb, NFTA_SET_TIMEOUT, |
2629 | cpu_to_be64(jiffies_to_msecs(set->timeout)), | |
b46f6ded | 2630 | NFTA_SET_PAD)) |
761da293 PM |
2631 | goto nla_put_failure; |
2632 | if (set->gc_int && | |
2633 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
2634 | goto nla_put_failure; | |
2635 | ||
9363dc4b AB |
2636 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
2637 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
2638 | goto nla_put_failure; | |
2639 | } | |
2640 | ||
e6d8ecac CFG |
2641 | if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) |
2642 | goto nla_put_failure; | |
2643 | ||
c50b960c PM |
2644 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
2645 | if (desc == NULL) | |
2646 | goto nla_put_failure; | |
2647 | if (set->size && | |
2648 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
2649 | goto nla_put_failure; | |
2650 | nla_nest_end(skb, desc); | |
2651 | ||
053c095a JB |
2652 | nlmsg_end(skb, nlh); |
2653 | return 0; | |
20a69341 PM |
2654 | |
2655 | nla_put_failure: | |
2656 | nlmsg_trim(skb, nlh); | |
2657 | return -1; | |
2658 | } | |
2659 | ||
2660 | static int nf_tables_set_notify(const struct nft_ctx *ctx, | |
2661 | const struct nft_set *set, | |
31f8441c | 2662 | int event, gfp_t gfp_flags) |
20a69341 PM |
2663 | { |
2664 | struct sk_buff *skb; | |
128ad332 | 2665 | u32 portid = ctx->portid; |
20a69341 PM |
2666 | int err; |
2667 | ||
128ad332 PNA |
2668 | if (!ctx->report && |
2669 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
20a69341 PM |
2670 | return 0; |
2671 | ||
2672 | err = -ENOBUFS; | |
31f8441c | 2673 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
2674 | if (skb == NULL) |
2675 | goto err; | |
2676 | ||
2677 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2678 | if (err < 0) { | |
2679 | kfree_skb(skb); | |
2680 | goto err; | |
2681 | } | |
2682 | ||
128ad332 | 2683 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, |
31f8441c | 2684 | ctx->report, gfp_flags); |
20a69341 PM |
2685 | err: |
2686 | if (err < 0) | |
99633ab2 | 2687 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
20a69341 PM |
2688 | return err; |
2689 | } | |
2690 | ||
5b96af77 | 2691 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
2692 | { |
2693 | const struct nft_set *set; | |
2694 | unsigned int idx, s_idx = cb->args[0]; | |
7c95f6d8 | 2695 | struct nft_af_info *afi; |
c9c8e485 PNA |
2696 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2697 | struct net *net = sock_net(skb->sk); | |
2698 | int cur_family = cb->args[3]; | |
5b96af77 | 2699 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
2700 | |
2701 | if (cb->args[1]) | |
2702 | return skb->len; | |
2703 | ||
e688a7f8 | 2704 | rcu_read_lock(); |
38e029f1 PNA |
2705 | cb->seq = net->nft.base_seq; |
2706 | ||
e688a7f8 | 2707 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
5b96af77 PNA |
2708 | if (ctx->afi && ctx->afi != afi) |
2709 | continue; | |
2710 | ||
c9c8e485 PNA |
2711 | if (cur_family) { |
2712 | if (afi->family != cur_family) | |
2713 | continue; | |
2714 | ||
2715 | cur_family = 0; | |
2716 | } | |
e688a7f8 | 2717 | list_for_each_entry_rcu(table, &afi->tables, list) { |
5b96af77 PNA |
2718 | if (ctx->table && ctx->table != table) |
2719 | continue; | |
2720 | ||
c9c8e485 PNA |
2721 | if (cur_table) { |
2722 | if (cur_table != table) | |
2723 | continue; | |
2724 | ||
2725 | cur_table = NULL; | |
2726 | } | |
c9c8e485 | 2727 | idx = 0; |
5b96af77 | 2728 | list_for_each_entry_rcu(set, &table->sets, list) { |
c9c8e485 PNA |
2729 | if (idx < s_idx) |
2730 | goto cont; | |
37a9cc52 PNA |
2731 | if (!nft_is_active(net, set)) |
2732 | goto cont; | |
5b96af77 PNA |
2733 | |
2734 | ctx_set = *ctx; | |
2735 | ctx_set.table = table; | |
2736 | ctx_set.afi = afi; | |
2737 | if (nf_tables_fill_set(skb, &ctx_set, set, | |
c9c8e485 PNA |
2738 | NFT_MSG_NEWSET, |
2739 | NLM_F_MULTI) < 0) { | |
2740 | cb->args[0] = idx; | |
2741 | cb->args[2] = (unsigned long) table; | |
2742 | cb->args[3] = afi->family; | |
2743 | goto done; | |
2744 | } | |
38e029f1 | 2745 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 PNA |
2746 | cont: |
2747 | idx++; | |
2748 | } | |
2749 | if (s_idx) | |
2750 | s_idx = 0; | |
2751 | } | |
2752 | } | |
2753 | cb->args[1] = 1; | |
2754 | done: | |
e688a7f8 | 2755 | rcu_read_unlock(); |
c9c8e485 PNA |
2756 | return skb->len; |
2757 | } | |
2758 | ||
5b96af77 | 2759 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 2760 | { |
5b96af77 PNA |
2761 | kfree(cb->data); |
2762 | return 0; | |
20a69341 PM |
2763 | } |
2764 | ||
7b8002a1 PNA |
2765 | static int nf_tables_getset(struct net *net, struct sock *nlsk, |
2766 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
2767 | const struct nlattr * const nla[]) |
2768 | { | |
f2a6d766 | 2769 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
2770 | const struct nft_set *set; |
2771 | struct nft_ctx ctx; | |
2772 | struct sk_buff *skb2; | |
c9c8e485 | 2773 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2774 | int err; |
2775 | ||
01cfa0a4 | 2776 | /* Verify existence before starting dump */ |
f2a6d766 | 2777 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
2778 | if (err < 0) |
2779 | return err; | |
2780 | ||
2781 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2782 | struct netlink_dump_control c = { | |
2783 | .dump = nf_tables_dump_sets, | |
5b96af77 | 2784 | .done = nf_tables_dump_sets_done, |
20a69341 | 2785 | }; |
5b96af77 PNA |
2786 | struct nft_ctx *ctx_dump; |
2787 | ||
2788 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); | |
2789 | if (ctx_dump == NULL) | |
2790 | return -ENOMEM; | |
2791 | ||
2792 | *ctx_dump = ctx; | |
2793 | c.data = ctx_dump; | |
2794 | ||
20a69341 PM |
2795 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2796 | } | |
2797 | ||
c9c8e485 PNA |
2798 | /* Only accept unspec with dump */ |
2799 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2800 | return -EAFNOSUPPORT; | |
eaa2bcd6 PT |
2801 | if (!nla[NFTA_SET_TABLE]) |
2802 | return -EINVAL; | |
c9c8e485 | 2803 | |
37a9cc52 | 2804 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
2805 | if (IS_ERR(set)) |
2806 | return PTR_ERR(set); | |
2807 | ||
2808 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2809 | if (skb2 == NULL) | |
2810 | return -ENOMEM; | |
2811 | ||
2812 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2813 | if (err < 0) | |
2814 | goto err; | |
2815 | ||
2816 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2817 | ||
2818 | err: | |
2819 | kfree_skb(skb2); | |
2820 | return err; | |
2821 | } | |
2822 | ||
c50b960c PM |
2823 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
2824 | struct nft_set_desc *desc, | |
2825 | const struct nlattr *nla) | |
2826 | { | |
2827 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
2828 | int err; | |
2829 | ||
2830 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy); | |
2831 | if (err < 0) | |
2832 | return err; | |
2833 | ||
2834 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
2835 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
2836 | ||
2837 | return 0; | |
2838 | } | |
2839 | ||
633c9a84 PNA |
2840 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
2841 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
2842 | const struct nlattr * const nla[]) |
2843 | { | |
2844 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2845 | u8 genmask = nft_genmask_next(net); |
20a69341 | 2846 | const struct nft_set_ops *ops; |
7c95f6d8 | 2847 | struct nft_af_info *afi; |
20a69341 PM |
2848 | struct nft_table *table; |
2849 | struct nft_set *set; | |
2850 | struct nft_ctx ctx; | |
cb39ad8b | 2851 | char name[NFT_SET_MAXNAMELEN]; |
20a69341 PM |
2852 | unsigned int size; |
2853 | bool create; | |
761da293 | 2854 | u64 timeout; |
8aeff920 | 2855 | u32 ktype, dtype, flags, policy, gc_int, objtype; |
c50b960c | 2856 | struct nft_set_desc desc; |
e6d8ecac CFG |
2857 | unsigned char *udata; |
2858 | u16 udlen; | |
20a69341 PM |
2859 | int err; |
2860 | ||
2861 | if (nla[NFTA_SET_TABLE] == NULL || | |
2862 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
2863 | nla[NFTA_SET_KEY_LEN] == NULL || |
2864 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
2865 | return -EINVAL; |
2866 | ||
c50b960c PM |
2867 | memset(&desc, 0, sizeof(desc)); |
2868 | ||
20a69341 PM |
2869 | ktype = NFT_DATA_VALUE; |
2870 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
2871 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
2872 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
2873 | return -EINVAL; | |
2874 | } | |
2875 | ||
c50b960c | 2876 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 2877 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
2878 | return -EINVAL; |
2879 | ||
2880 | flags = 0; | |
2881 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2882 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
2883 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 | 2884 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
8aeff920 PNA |
2885 | NFT_SET_MAP | NFT_SET_EVAL | |
2886 | NFT_SET_OBJECT)) | |
20a69341 | 2887 | return -EINVAL; |
8aeff920 PNA |
2888 | /* Only one of these operations is supported */ |
2889 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) == | |
2890 | (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) | |
7c6c6e95 | 2891 | return -EOPNOTSUPP; |
20a69341 PM |
2892 | } |
2893 | ||
2894 | dtype = 0; | |
20a69341 PM |
2895 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
2896 | if (!(flags & NFT_SET_MAP)) | |
2897 | return -EINVAL; | |
2898 | ||
2899 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
2900 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
2901 | dtype != NFT_DATA_VERDICT) | |
2902 | return -EINVAL; | |
2903 | ||
2904 | if (dtype != NFT_DATA_VERDICT) { | |
2905 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
2906 | return -EINVAL; | |
c50b960c | 2907 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 2908 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
2909 | return -EINVAL; |
2910 | } else | |
7d740264 | 2911 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
2912 | } else if (flags & NFT_SET_MAP) |
2913 | return -EINVAL; | |
2914 | ||
8aeff920 PNA |
2915 | if (nla[NFTA_SET_OBJ_TYPE] != NULL) { |
2916 | if (!(flags & NFT_SET_OBJECT)) | |
2917 | return -EINVAL; | |
2918 | ||
2919 | objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); | |
2920 | if (objtype == NFT_OBJECT_UNSPEC || | |
2921 | objtype > NFT_OBJECT_MAX) | |
2922 | return -EINVAL; | |
2923 | } else if (flags & NFT_SET_OBJECT) | |
2924 | return -EINVAL; | |
2925 | else | |
2926 | objtype = NFT_OBJECT_UNSPEC; | |
2927 | ||
761da293 PM |
2928 | timeout = 0; |
2929 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
2930 | if (!(flags & NFT_SET_TIMEOUT)) | |
2931 | return -EINVAL; | |
d3e2a111 AP |
2932 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
2933 | nla[NFTA_SET_TIMEOUT]))); | |
761da293 PM |
2934 | } |
2935 | gc_int = 0; | |
2936 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
2937 | if (!(flags & NFT_SET_TIMEOUT)) | |
2938 | return -EINVAL; | |
2939 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
2940 | } | |
2941 | ||
c50b960c PM |
2942 | policy = NFT_SET_POL_PERFORMANCE; |
2943 | if (nla[NFTA_SET_POLICY] != NULL) | |
2944 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
2945 | ||
2946 | if (nla[NFTA_SET_DESC] != NULL) { | |
2947 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
2948 | if (err < 0) | |
2949 | return err; | |
2950 | } | |
2951 | ||
20a69341 PM |
2952 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
2953 | ||
99633ab2 | 2954 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
2955 | if (IS_ERR(afi)) |
2956 | return PTR_ERR(afi); | |
2957 | ||
f2a6d766 | 2958 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask); |
20a69341 PM |
2959 | if (IS_ERR(table)) |
2960 | return PTR_ERR(table); | |
2961 | ||
633c9a84 | 2962 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 | 2963 | |
37a9cc52 | 2964 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
2965 | if (IS_ERR(set)) { |
2966 | if (PTR_ERR(set) != -ENOENT) | |
2967 | return PTR_ERR(set); | |
1a28ad74 | 2968 | } else { |
20a69341 PM |
2969 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
2970 | return -EEXIST; | |
2971 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2972 | return -EOPNOTSUPP; | |
2973 | return 0; | |
2974 | } | |
2975 | ||
2976 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2977 | return -ENOENT; | |
2978 | ||
c50b960c | 2979 | ops = nft_select_set_ops(nla, &desc, policy); |
20a69341 PM |
2980 | if (IS_ERR(ops)) |
2981 | return PTR_ERR(ops); | |
2982 | ||
e6d8ecac CFG |
2983 | udlen = 0; |
2984 | if (nla[NFTA_SET_USERDATA]) | |
2985 | udlen = nla_len(nla[NFTA_SET_USERDATA]); | |
2986 | ||
20a69341 PM |
2987 | size = 0; |
2988 | if (ops->privsize != NULL) | |
2989 | size = ops->privsize(nla); | |
2990 | ||
2991 | err = -ENOMEM; | |
e6d8ecac | 2992 | set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); |
20a69341 PM |
2993 | if (set == NULL) |
2994 | goto err1; | |
2995 | ||
2996 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); | |
2997 | err = nf_tables_set_alloc_name(&ctx, set, name); | |
2998 | if (err < 0) | |
2999 | goto err2; | |
3000 | ||
e6d8ecac CFG |
3001 | udata = NULL; |
3002 | if (udlen) { | |
3003 | udata = set->data + size; | |
3004 | nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); | |
3005 | } | |
3006 | ||
20a69341 PM |
3007 | INIT_LIST_HEAD(&set->bindings); |
3008 | set->ops = ops; | |
3009 | set->ktype = ktype; | |
c50b960c | 3010 | set->klen = desc.klen; |
20a69341 | 3011 | set->dtype = dtype; |
8aeff920 | 3012 | set->objtype = objtype; |
c50b960c | 3013 | set->dlen = desc.dlen; |
20a69341 | 3014 | set->flags = flags; |
c50b960c | 3015 | set->size = desc.size; |
9363dc4b | 3016 | set->policy = policy; |
e6d8ecac CFG |
3017 | set->udlen = udlen; |
3018 | set->udata = udata; | |
761da293 PM |
3019 | set->timeout = timeout; |
3020 | set->gc_int = gc_int; | |
20a69341 | 3021 | |
c50b960c | 3022 | err = ops->init(set, &desc, nla); |
20a69341 PM |
3023 | if (err < 0) |
3024 | goto err2; | |
3025 | ||
958bee14 | 3026 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 | 3027 | if (err < 0) |
c17c3cdf | 3028 | goto err3; |
20a69341 | 3029 | |
e688a7f8 | 3030 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 3031 | table->use++; |
20a69341 PM |
3032 | return 0; |
3033 | ||
c17c3cdf LZ |
3034 | err3: |
3035 | ops->destroy(set); | |
20a69341 PM |
3036 | err2: |
3037 | kfree(set); | |
3038 | err1: | |
3039 | module_put(ops->owner); | |
3040 | return err; | |
3041 | } | |
3042 | ||
958bee14 | 3043 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 3044 | { |
20a69341 PM |
3045 | set->ops->destroy(set); |
3046 | module_put(set->ops->owner); | |
3047 | kfree(set); | |
3048 | } | |
3049 | ||
958bee14 PNA |
3050 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
3051 | { | |
e688a7f8 | 3052 | list_del_rcu(&set->list); |
31f8441c | 3053 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
3054 | nft_set_destroy(set); |
3055 | } | |
3056 | ||
633c9a84 PNA |
3057 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
3058 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
3059 | const struct nlattr * const nla[]) |
3060 | { | |
c9c8e485 | 3061 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
f2a6d766 | 3062 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3063 | struct nft_set *set; |
3064 | struct nft_ctx ctx; | |
3065 | int err; | |
3066 | ||
ec2c9935 PM |
3067 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
3068 | return -EAFNOSUPPORT; | |
20a69341 PM |
3069 | if (nla[NFTA_SET_TABLE] == NULL) |
3070 | return -EINVAL; | |
3071 | ||
f2a6d766 | 3072 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3073 | if (err < 0) |
3074 | return err; | |
3075 | ||
37a9cc52 | 3076 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3077 | if (IS_ERR(set)) |
3078 | return PTR_ERR(set); | |
3079 | if (!list_empty(&set->bindings)) | |
3080 | return -EBUSY; | |
3081 | ||
ee01d542 | 3082 | return nft_delset(&ctx, set); |
20a69341 PM |
3083 | } |
3084 | ||
3085 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 3086 | struct nft_set *set, |
20a69341 | 3087 | const struct nft_set_iter *iter, |
de70185d | 3088 | struct nft_set_elem *elem) |
20a69341 | 3089 | { |
fe2811eb | 3090 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3091 | enum nft_registers dreg; |
3092 | ||
3093 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
3094 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
3095 | set->dtype == NFT_DATA_VERDICT ? | |
3096 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
3097 | set->dlen); | |
20a69341 PM |
3098 | } |
3099 | ||
3100 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3101 | struct nft_set_binding *binding) | |
3102 | { | |
3103 | struct nft_set_binding *i; | |
3104 | struct nft_set_iter iter; | |
3105 | ||
3106 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
3107 | return -EBUSY; | |
3108 | ||
11113e19 | 3109 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
3110 | /* If the set is already bound to the same chain all |
3111 | * jumps are already validated for that chain. | |
3112 | */ | |
3113 | list_for_each_entry(i, &set->bindings, list) { | |
a4684402 | 3114 | if (i->flags & NFT_SET_MAP && |
11113e19 | 3115 | i->chain == binding->chain) |
20a69341 PM |
3116 | goto bind; |
3117 | } | |
3118 | ||
8588ac09 | 3119 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
3120 | iter.skip = 0; |
3121 | iter.count = 0; | |
3122 | iter.err = 0; | |
3123 | iter.fn = nf_tables_bind_check_setelem; | |
1f48ff6c | 3124 | iter.flush = false; |
20a69341 PM |
3125 | |
3126 | set->ops->walk(ctx, set, &iter); | |
a02f4248 | 3127 | if (iter.err < 0) |
20a69341 | 3128 | return iter.err; |
20a69341 PM |
3129 | } |
3130 | bind: | |
3131 | binding->chain = ctx->chain; | |
e688a7f8 | 3132 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
3133 | return 0; |
3134 | } | |
63aea290 | 3135 | EXPORT_SYMBOL_GPL(nf_tables_bind_set); |
20a69341 PM |
3136 | |
3137 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3138 | struct nft_set_binding *binding) | |
3139 | { | |
e688a7f8 | 3140 | list_del_rcu(&binding->list); |
20a69341 | 3141 | |
958bee14 | 3142 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
37a9cc52 | 3143 | nft_is_active(ctx->net, set)) |
20a69341 PM |
3144 | nf_tables_set_destroy(ctx, set); |
3145 | } | |
63aea290 | 3146 | EXPORT_SYMBOL_GPL(nf_tables_unbind_set); |
20a69341 | 3147 | |
3ac4c07a PM |
3148 | const struct nft_set_ext_type nft_set_ext_types[] = { |
3149 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 3150 | .align = __alignof__(u32), |
3ac4c07a PM |
3151 | }, |
3152 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 3153 | .align = __alignof__(u32), |
3ac4c07a | 3154 | }, |
f25ad2e9 PM |
3155 | [NFT_SET_EXT_EXPR] = { |
3156 | .align = __alignof__(struct nft_expr), | |
3157 | }, | |
8aeff920 PNA |
3158 | [NFT_SET_EXT_OBJREF] = { |
3159 | .len = sizeof(struct nft_object *), | |
3160 | .align = __alignof__(struct nft_object *), | |
3161 | }, | |
3ac4c07a PM |
3162 | [NFT_SET_EXT_FLAGS] = { |
3163 | .len = sizeof(u8), | |
3164 | .align = __alignof__(u8), | |
3165 | }, | |
c3e1b005 PM |
3166 | [NFT_SET_EXT_TIMEOUT] = { |
3167 | .len = sizeof(u64), | |
3168 | .align = __alignof__(u64), | |
3169 | }, | |
3170 | [NFT_SET_EXT_EXPIRATION] = { | |
3171 | .len = sizeof(unsigned long), | |
3172 | .align = __alignof__(unsigned long), | |
3173 | }, | |
68e942e8 PM |
3174 | [NFT_SET_EXT_USERDATA] = { |
3175 | .len = sizeof(struct nft_userdata), | |
3176 | .align = __alignof__(struct nft_userdata), | |
3177 | }, | |
3ac4c07a PM |
3178 | }; |
3179 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
3180 | ||
20a69341 PM |
3181 | /* |
3182 | * Set elements | |
3183 | */ | |
3184 | ||
3185 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
3186 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
3187 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
3188 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 3189 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
3190 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
3191 | .len = NFT_USERDATA_MAXLEN }, | |
20a69341 PM |
3192 | }; |
3193 | ||
3194 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
b2fbd044 LZ |
3195 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, |
3196 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
3197 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, | |
3198 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
20a69341 | 3199 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
958bee14 | 3200 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
3201 | }; |
3202 | ||
633c9a84 | 3203 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
3204 | const struct sk_buff *skb, |
3205 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
3206 | const struct nlattr * const nla[], |
3207 | u8 genmask) | |
20a69341 PM |
3208 | { |
3209 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
3210 | struct nft_af_info *afi; |
3211 | struct nft_table *table; | |
20a69341 | 3212 | |
99633ab2 | 3213 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
3214 | if (IS_ERR(afi)) |
3215 | return PTR_ERR(afi); | |
3216 | ||
f2a6d766 PNA |
3217 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE], |
3218 | genmask); | |
20a69341 PM |
3219 | if (IS_ERR(table)) |
3220 | return PTR_ERR(table); | |
3221 | ||
633c9a84 | 3222 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
3223 | return 0; |
3224 | } | |
3225 | ||
3226 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
3227 | const struct nft_set *set, | |
3228 | const struct nft_set_elem *elem) | |
3229 | { | |
fe2811eb | 3230 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3231 | unsigned char *b = skb_tail_pointer(skb); |
3232 | struct nlattr *nest; | |
3233 | ||
3234 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
3235 | if (nest == NULL) | |
3236 | goto nla_put_failure; | |
3237 | ||
fe2811eb PM |
3238 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
3239 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
3240 | goto nla_put_failure; |
3241 | ||
fe2811eb PM |
3242 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3243 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
3244 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
3245 | set->dlen) < 0) | |
3246 | goto nla_put_failure; | |
3247 | ||
f25ad2e9 PM |
3248 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3249 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3250 | goto nla_put_failure; | |
3251 | ||
8aeff920 PNA |
3252 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && |
3253 | nla_put_string(skb, NFTA_SET_ELEM_OBJREF, | |
3254 | (*nft_set_ext_obj(ext))->name) < 0) | |
3255 | goto nla_put_failure; | |
3256 | ||
fe2811eb PM |
3257 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3258 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3259 | htonl(*nft_set_ext_flags(ext)))) | |
3260 | goto nla_put_failure; | |
20a69341 | 3261 | |
c3e1b005 PM |
3262 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3263 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
d3e2a111 AP |
3264 | cpu_to_be64(jiffies_to_msecs( |
3265 | *nft_set_ext_timeout(ext))), | |
b46f6ded | 3266 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3267 | goto nla_put_failure; |
3268 | ||
3269 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
3270 | unsigned long expires, now = jiffies; | |
3271 | ||
3272 | expires = *nft_set_ext_expiration(ext); | |
3273 | if (time_before(now, expires)) | |
3274 | expires -= now; | |
3275 | else | |
3276 | expires = 0; | |
3277 | ||
3278 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
b46f6ded ND |
3279 | cpu_to_be64(jiffies_to_msecs(expires)), |
3280 | NFTA_SET_ELEM_PAD)) | |
c3e1b005 PM |
3281 | goto nla_put_failure; |
3282 | } | |
3283 | ||
68e942e8 PM |
3284 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3285 | struct nft_userdata *udata; | |
3286 | ||
3287 | udata = nft_set_ext_userdata(ext); | |
3288 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3289 | udata->len + 1, udata->data)) | |
3290 | goto nla_put_failure; | |
3291 | } | |
3292 | ||
20a69341 PM |
3293 | nla_nest_end(skb, nest); |
3294 | return 0; | |
3295 | ||
3296 | nla_put_failure: | |
3297 | nlmsg_trim(skb, b); | |
3298 | return -EMSGSIZE; | |
3299 | } | |
3300 | ||
3301 | struct nft_set_dump_args { | |
3302 | const struct netlink_callback *cb; | |
3303 | struct nft_set_iter iter; | |
3304 | struct sk_buff *skb; | |
3305 | }; | |
3306 | ||
3307 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
de70185d | 3308 | struct nft_set *set, |
20a69341 | 3309 | const struct nft_set_iter *iter, |
de70185d | 3310 | struct nft_set_elem *elem) |
20a69341 PM |
3311 | { |
3312 | struct nft_set_dump_args *args; | |
3313 | ||
3314 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3315 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3316 | } | |
3317 | ||
3318 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) | |
3319 | { | |
633c9a84 | 3320 | struct net *net = sock_net(skb->sk); |
f2a6d766 | 3321 | u8 genmask = nft_genmask_cur(net); |
de70185d | 3322 | struct nft_set *set; |
20a69341 PM |
3323 | struct nft_set_dump_args args; |
3324 | struct nft_ctx ctx; | |
3325 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; | |
3326 | struct nfgenmsg *nfmsg; | |
3327 | struct nlmsghdr *nlh; | |
3328 | struct nlattr *nest; | |
3329 | u32 portid, seq; | |
3330 | int event, err; | |
3331 | ||
720e0dfa MN |
3332 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
3333 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); | |
20a69341 PM |
3334 | if (err < 0) |
3335 | return err; | |
3336 | ||
633c9a84 | 3337 | err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh, |
f2a6d766 | 3338 | (void *)nla, genmask); |
20a69341 PM |
3339 | if (err < 0) |
3340 | return err; | |
3341 | ||
37a9cc52 PNA |
3342 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3343 | genmask); | |
20a69341 PM |
3344 | if (IS_ERR(set)) |
3345 | return PTR_ERR(set); | |
3346 | ||
3347 | event = NFT_MSG_NEWSETELEM; | |
3348 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
3349 | portid = NETLINK_CB(cb->skb).portid; | |
3350 | seq = cb->nlh->nlmsg_seq; | |
3351 | ||
3352 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3353 | NLM_F_MULTI); | |
3354 | if (nlh == NULL) | |
3355 | goto nla_put_failure; | |
3356 | ||
3357 | nfmsg = nlmsg_data(nlh); | |
6403d962 | 3358 | nfmsg->nfgen_family = ctx.afi->family; |
20a69341 | 3359 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 3360 | nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff); |
20a69341 PM |
3361 | |
3362 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) | |
3363 | goto nla_put_failure; | |
3364 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3365 | goto nla_put_failure; | |
3366 | ||
3367 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3368 | if (nest == NULL) | |
3369 | goto nla_put_failure; | |
3370 | ||
8588ac09 PNA |
3371 | args.cb = cb; |
3372 | args.skb = skb; | |
3373 | args.iter.genmask = nft_genmask_cur(ctx.net); | |
3374 | args.iter.skip = cb->args[0]; | |
3375 | args.iter.count = 0; | |
3376 | args.iter.err = 0; | |
3377 | args.iter.fn = nf_tables_dump_setelem; | |
1f48ff6c | 3378 | args.iter.flush = false; |
20a69341 PM |
3379 | set->ops->walk(&ctx, set, &args.iter); |
3380 | ||
3381 | nla_nest_end(skb, nest); | |
3382 | nlmsg_end(skb, nlh); | |
3383 | ||
3384 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3385 | return args.iter.err; | |
3386 | if (args.iter.count == cb->args[0]) | |
3387 | return 0; | |
3388 | ||
3389 | cb->args[0] = args.iter.count; | |
3390 | return skb->len; | |
3391 | ||
3392 | nla_put_failure: | |
3393 | return -ENOSPC; | |
3394 | } | |
3395 | ||
7b8002a1 PNA |
3396 | static int nf_tables_getsetelem(struct net *net, struct sock *nlsk, |
3397 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
3398 | const struct nlattr * const nla[]) |
3399 | { | |
f2a6d766 | 3400 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
3401 | const struct nft_set *set; |
3402 | struct nft_ctx ctx; | |
3403 | int err; | |
3404 | ||
f2a6d766 | 3405 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3406 | if (err < 0) |
3407 | return err; | |
3408 | ||
37a9cc52 PNA |
3409 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3410 | genmask); | |
20a69341 PM |
3411 | if (IS_ERR(set)) |
3412 | return PTR_ERR(set); | |
3413 | ||
3414 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3415 | struct netlink_dump_control c = { | |
3416 | .dump = nf_tables_dump_set, | |
3417 | }; | |
3418 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
3419 | } | |
3420 | return -EOPNOTSUPP; | |
3421 | } | |
3422 | ||
d60ce62f AB |
3423 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
3424 | const struct nft_ctx *ctx, u32 seq, | |
3425 | u32 portid, int event, u16 flags, | |
3426 | const struct nft_set *set, | |
3427 | const struct nft_set_elem *elem) | |
3428 | { | |
3429 | struct nfgenmsg *nfmsg; | |
3430 | struct nlmsghdr *nlh; | |
3431 | struct nlattr *nest; | |
3432 | int err; | |
3433 | ||
3434 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
3435 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3436 | flags); | |
3437 | if (nlh == NULL) | |
3438 | goto nla_put_failure; | |
3439 | ||
3440 | nfmsg = nlmsg_data(nlh); | |
3441 | nfmsg->nfgen_family = ctx->afi->family; | |
3442 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 3443 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
3444 | |
3445 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3446 | goto nla_put_failure; | |
3447 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3448 | goto nla_put_failure; | |
3449 | ||
3450 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3451 | if (nest == NULL) | |
3452 | goto nla_put_failure; | |
3453 | ||
3454 | err = nf_tables_fill_setelem(skb, set, elem); | |
3455 | if (err < 0) | |
3456 | goto nla_put_failure; | |
3457 | ||
3458 | nla_nest_end(skb, nest); | |
3459 | ||
053c095a JB |
3460 | nlmsg_end(skb, nlh); |
3461 | return 0; | |
d60ce62f AB |
3462 | |
3463 | nla_put_failure: | |
3464 | nlmsg_trim(skb, nlh); | |
3465 | return -1; | |
3466 | } | |
3467 | ||
3468 | static int nf_tables_setelem_notify(const struct nft_ctx *ctx, | |
3469 | const struct nft_set *set, | |
3470 | const struct nft_set_elem *elem, | |
3471 | int event, u16 flags) | |
3472 | { | |
128ad332 PNA |
3473 | struct net *net = ctx->net; |
3474 | u32 portid = ctx->portid; | |
d60ce62f AB |
3475 | struct sk_buff *skb; |
3476 | int err; | |
3477 | ||
128ad332 | 3478 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
d60ce62f AB |
3479 | return 0; |
3480 | ||
3481 | err = -ENOBUFS; | |
3482 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
3483 | if (skb == NULL) | |
3484 | goto err; | |
3485 | ||
3486 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
3487 | set, elem); | |
3488 | if (err < 0) { | |
3489 | kfree_skb(skb); | |
3490 | goto err; | |
3491 | } | |
3492 | ||
128ad332 | 3493 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
d60ce62f AB |
3494 | GFP_KERNEL); |
3495 | err: | |
3496 | if (err < 0) | |
3497 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
3498 | return err; | |
3499 | } | |
3500 | ||
60319eb1 PNA |
3501 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
3502 | int msg_type, | |
3503 | struct nft_set *set) | |
3504 | { | |
3505 | struct nft_trans *trans; | |
3506 | ||
3507 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
3508 | if (trans == NULL) | |
3509 | return NULL; | |
3510 | ||
3511 | nft_trans_elem_set(trans) = set; | |
3512 | return trans; | |
3513 | } | |
3514 | ||
22fe54d5 PM |
3515 | void *nft_set_elem_init(const struct nft_set *set, |
3516 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 3517 | const u32 *key, const u32 *data, |
22fe54d5 | 3518 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
3519 | { |
3520 | struct nft_set_ext *ext; | |
3521 | void *elem; | |
3522 | ||
3523 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
3524 | if (elem == NULL) | |
3525 | return NULL; | |
3526 | ||
3527 | ext = nft_set_elem_ext(set, elem); | |
3528 | nft_set_ext_init(ext, tmpl); | |
3529 | ||
3530 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
3531 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3532 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
3533 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
3534 | *nft_set_ext_expiration(ext) = | |
d3e2a111 | 3535 | jiffies + timeout; |
c3e1b005 PM |
3536 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) |
3537 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
3538 | |
3539 | return elem; | |
3540 | } | |
3541 | ||
61f9e292 LZ |
3542 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
3543 | bool destroy_expr) | |
61edafbb PM |
3544 | { |
3545 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3546 | ||
3547 | nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE); | |
3548 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3549 | nft_data_uninit(nft_set_ext_data(ext), set->dtype); | |
61f9e292 | 3550 | if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) |
f25ad2e9 | 3551 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); |
8aeff920 PNA |
3552 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) |
3553 | (*nft_set_ext_obj(ext))->use--; | |
61edafbb PM |
3554 | kfree(elem); |
3555 | } | |
3556 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
3557 | ||
0e9091d6 PNA |
3558 | static int nft_setelem_parse_flags(const struct nft_set *set, |
3559 | const struct nlattr *attr, u32 *flags) | |
3560 | { | |
3561 | if (attr == NULL) | |
3562 | return 0; | |
3563 | ||
3564 | *flags = ntohl(nla_get_be32(attr)); | |
3565 | if (*flags & ~NFT_SET_ELEM_INTERVAL_END) | |
3566 | return -EINVAL; | |
3567 | if (!(set->flags & NFT_SET_INTERVAL) && | |
3568 | *flags & NFT_SET_ELEM_INTERVAL_END) | |
3569 | return -EINVAL; | |
3570 | ||
3571 | return 0; | |
3572 | } | |
3573 | ||
60319eb1 | 3574 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
c016c7e4 | 3575 | const struct nlattr *attr, u32 nlmsg_flags) |
20a69341 PM |
3576 | { |
3577 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
8aeff920 | 3578 | u8 genmask = nft_genmask_next(ctx->net); |
20a69341 | 3579 | struct nft_data_desc d1, d2; |
fe2811eb | 3580 | struct nft_set_ext_tmpl tmpl; |
c016c7e4 | 3581 | struct nft_set_ext *ext, *ext2; |
20a69341 PM |
3582 | struct nft_set_elem elem; |
3583 | struct nft_set_binding *binding; | |
8aeff920 | 3584 | struct nft_object *obj = NULL; |
68e942e8 | 3585 | struct nft_userdata *udata; |
fe2811eb | 3586 | struct nft_data data; |
20a69341 | 3587 | enum nft_registers dreg; |
60319eb1 | 3588 | struct nft_trans *trans; |
0e9091d6 | 3589 | u32 flags = 0; |
c3e1b005 | 3590 | u64 timeout; |
68e942e8 | 3591 | u8 ulen; |
20a69341 PM |
3592 | int err; |
3593 | ||
3594 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3595 | nft_set_elem_policy); | |
3596 | if (err < 0) | |
3597 | return err; | |
3598 | ||
3599 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3600 | return -EINVAL; | |
3601 | ||
fe2811eb PM |
3602 | nft_set_ext_prepare(&tmpl); |
3603 | ||
0e9091d6 PNA |
3604 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); |
3605 | if (err < 0) | |
3606 | return err; | |
3607 | if (flags != 0) | |
3608 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
3609 | |
3610 | if (set->flags & NFT_SET_MAP) { | |
3611 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 3612 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 3613 | return -EINVAL; |
bd7fc645 | 3614 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 3615 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 3616 | return -EINVAL; |
20a69341 PM |
3617 | } else { |
3618 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
3619 | return -EINVAL; | |
3620 | } | |
3621 | ||
c3e1b005 PM |
3622 | timeout = 0; |
3623 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
3624 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
3625 | return -EINVAL; | |
d3e2a111 AP |
3626 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3627 | nla[NFTA_SET_ELEM_TIMEOUT]))); | |
c3e1b005 PM |
3628 | } else if (set->flags & NFT_SET_TIMEOUT) { |
3629 | timeout = set->timeout; | |
3630 | } | |
3631 | ||
7d740264 | 3632 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 3633 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3634 | if (err < 0) |
3635 | goto err1; | |
3636 | err = -EINVAL; | |
3637 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
3638 | goto err2; | |
3639 | ||
7d740264 | 3640 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
3641 | if (timeout > 0) { |
3642 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
3643 | if (timeout != set->timeout) | |
3644 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
3645 | } | |
fe2811eb | 3646 | |
8aeff920 PNA |
3647 | if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { |
3648 | if (!(set->flags & NFT_SET_OBJECT)) { | |
3649 | err = -EINVAL; | |
3650 | goto err2; | |
3651 | } | |
3652 | obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF], | |
3653 | set->objtype, genmask); | |
3654 | if (IS_ERR(obj)) { | |
3655 | err = PTR_ERR(obj); | |
3656 | goto err2; | |
3657 | } | |
3658 | nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); | |
3659 | } | |
3660 | ||
20a69341 | 3661 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
3662 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
3663 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
3664 | if (err < 0) |
3665 | goto err2; | |
3666 | ||
3667 | err = -EINVAL; | |
3668 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
3669 | goto err3; | |
3670 | ||
3671 | dreg = nft_type_to_reg(set->dtype); | |
3672 | list_for_each_entry(binding, &set->bindings, list) { | |
3673 | struct nft_ctx bind_ctx = { | |
58c78e10 | 3674 | .net = ctx->net, |
20a69341 PM |
3675 | .afi = ctx->afi, |
3676 | .table = ctx->table, | |
7c95f6d8 | 3677 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
3678 | }; |
3679 | ||
11113e19 PM |
3680 | if (!(binding->flags & NFT_SET_MAP)) |
3681 | continue; | |
3682 | ||
1ec10212 PM |
3683 | err = nft_validate_register_store(&bind_ctx, dreg, |
3684 | &data, | |
3685 | d2.type, d2.len); | |
20a69341 PM |
3686 | if (err < 0) |
3687 | goto err3; | |
3688 | } | |
fe2811eb | 3689 | |
7d740264 | 3690 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
3691 | } |
3692 | ||
68e942e8 PM |
3693 | /* The full maximum length of userdata can exceed the maximum |
3694 | * offset value (U8_MAX) for following extensions, therefor it | |
3695 | * must be the last extension added. | |
3696 | */ | |
3697 | ulen = 0; | |
3698 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
3699 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
3700 | if (ulen > 0) | |
3701 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
3702 | ulen); | |
3703 | } | |
3704 | ||
fe2811eb | 3705 | err = -ENOMEM; |
7d740264 | 3706 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 3707 | timeout, GFP_KERNEL); |
fe2811eb PM |
3708 | if (elem.priv == NULL) |
3709 | goto err3; | |
3710 | ||
3711 | ext = nft_set_elem_ext(set, elem.priv); | |
3712 | if (flags) | |
3713 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
3714 | if (ulen > 0) { |
3715 | udata = nft_set_ext_userdata(ext); | |
3716 | udata->len = ulen - 1; | |
3717 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
3718 | } | |
8aeff920 PNA |
3719 | if (obj) { |
3720 | *nft_set_ext_obj(ext) = obj; | |
3721 | obj->use++; | |
3722 | } | |
fe2811eb | 3723 | |
60319eb1 PNA |
3724 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
3725 | if (trans == NULL) | |
fe2811eb | 3726 | goto err4; |
60319eb1 | 3727 | |
69086658 | 3728 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
c016c7e4 PNA |
3729 | err = set->ops->insert(ctx->net, set, &elem, &ext2); |
3730 | if (err) { | |
3731 | if (err == -EEXIST) { | |
8aeff920 PNA |
3732 | if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3733 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && | |
3734 | memcmp(nft_set_ext_data(ext), | |
3735 | nft_set_ext_data(ext2), set->dlen) != 0) || | |
3736 | (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && | |
3737 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && | |
3738 | *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) | |
c016c7e4 PNA |
3739 | err = -EBUSY; |
3740 | else if (!(nlmsg_flags & NLM_F_EXCL)) | |
3741 | err = 0; | |
3742 | } | |
fe2811eb | 3743 | goto err5; |
c016c7e4 | 3744 | } |
20a69341 | 3745 | |
35d0ac90 PNA |
3746 | if (set->size && |
3747 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { | |
3748 | err = -ENFILE; | |
3749 | goto err6; | |
3750 | } | |
3751 | ||
60319eb1 | 3752 | nft_trans_elem(trans) = elem; |
46bbafce | 3753 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
3754 | return 0; |
3755 | ||
35d0ac90 | 3756 | err6: |
5cb82a38 | 3757 | set->ops->remove(ctx->net, set, &elem); |
fe2811eb | 3758 | err5: |
60319eb1 | 3759 | kfree(trans); |
fe2811eb PM |
3760 | err4: |
3761 | kfree(elem.priv); | |
20a69341 PM |
3762 | err3: |
3763 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
fe2811eb | 3764 | nft_data_uninit(&data, d2.type); |
20a69341 | 3765 | err2: |
7d740264 | 3766 | nft_data_uninit(&elem.key.val, d1.type); |
20a69341 PM |
3767 | err1: |
3768 | return err; | |
3769 | } | |
3770 | ||
633c9a84 PNA |
3771 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
3772 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
3773 | const struct nlattr * const nla[]) |
3774 | { | |
f2a6d766 | 3775 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3776 | const struct nlattr *attr; |
3777 | struct nft_set *set; | |
3778 | struct nft_ctx ctx; | |
60319eb1 | 3779 | int rem, err = 0; |
20a69341 | 3780 | |
7d5570ca PNA |
3781 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
3782 | return -EINVAL; | |
3783 | ||
f2a6d766 | 3784 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3785 | if (err < 0) |
3786 | return err; | |
3787 | ||
37a9cc52 PNA |
3788 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3789 | genmask); | |
958bee14 PNA |
3790 | if (IS_ERR(set)) { |
3791 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { | |
3792 | set = nf_tables_set_lookup_byid(net, | |
37a9cc52 PNA |
3793 | nla[NFTA_SET_ELEM_LIST_SET_ID], |
3794 | genmask); | |
958bee14 PNA |
3795 | } |
3796 | if (IS_ERR(set)) | |
3797 | return PTR_ERR(set); | |
3798 | } | |
3799 | ||
20a69341 PM |
3800 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
3801 | return -EBUSY; | |
3802 | ||
3803 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
c016c7e4 | 3804 | err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags); |
35d0ac90 | 3805 | if (err < 0) |
60319eb1 | 3806 | break; |
20a69341 | 3807 | } |
60319eb1 | 3808 | return err; |
20a69341 PM |
3809 | } |
3810 | ||
60319eb1 | 3811 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
3812 | const struct nlattr *attr) |
3813 | { | |
3814 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3971ca14 | 3815 | struct nft_set_ext_tmpl tmpl; |
20a69341 PM |
3816 | struct nft_data_desc desc; |
3817 | struct nft_set_elem elem; | |
3971ca14 | 3818 | struct nft_set_ext *ext; |
60319eb1 | 3819 | struct nft_trans *trans; |
3971ca14 PNA |
3820 | u32 flags = 0; |
3821 | void *priv; | |
20a69341 PM |
3822 | int err; |
3823 | ||
3824 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3825 | nft_set_elem_policy); | |
3826 | if (err < 0) | |
3827 | goto err1; | |
3828 | ||
3829 | err = -EINVAL; | |
3830 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3831 | goto err1; | |
3832 | ||
3971ca14 PNA |
3833 | nft_set_ext_prepare(&tmpl); |
3834 | ||
3835 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
3836 | if (err < 0) | |
3837 | return err; | |
3838 | if (flags != 0) | |
3839 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
3840 | ||
7d740264 | 3841 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 3842 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3843 | if (err < 0) |
3844 | goto err1; | |
3845 | ||
3846 | err = -EINVAL; | |
3847 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
3848 | goto err2; | |
3849 | ||
3971ca14 PNA |
3850 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len); |
3851 | ||
3852 | err = -ENOMEM; | |
3853 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0, | |
3854 | GFP_KERNEL); | |
3855 | if (elem.priv == NULL) | |
3856 | goto err2; | |
3857 | ||
3858 | ext = nft_set_elem_ext(set, elem.priv); | |
3859 | if (flags) | |
3860 | *nft_set_ext_flags(ext) = flags; | |
3861 | ||
60319eb1 | 3862 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
3863 | if (trans == NULL) { |
3864 | err = -ENOMEM; | |
3971ca14 | 3865 | goto err3; |
609ccf08 | 3866 | } |
20a69341 | 3867 | |
42a55769 | 3868 | priv = set->ops->deactivate(ctx->net, set, &elem); |
3971ca14 | 3869 | if (priv == NULL) { |
cc02e457 | 3870 | err = -ENOENT; |
3971ca14 | 3871 | goto err4; |
cc02e457 | 3872 | } |
3971ca14 PNA |
3873 | kfree(elem.priv); |
3874 | elem.priv = priv; | |
cc02e457 | 3875 | |
60319eb1 | 3876 | nft_trans_elem(trans) = elem; |
46bbafce | 3877 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 3878 | return 0; |
cc02e457 | 3879 | |
3971ca14 | 3880 | err4: |
cc02e457 | 3881 | kfree(trans); |
3971ca14 PNA |
3882 | err3: |
3883 | kfree(elem.priv); | |
20a69341 | 3884 | err2: |
7d740264 | 3885 | nft_data_uninit(&elem.key.val, desc.type); |
20a69341 PM |
3886 | err1: |
3887 | return err; | |
3888 | } | |
3889 | ||
8411b644 | 3890 | static int nft_flush_set(const struct nft_ctx *ctx, |
de70185d | 3891 | struct nft_set *set, |
8411b644 | 3892 | const struct nft_set_iter *iter, |
de70185d | 3893 | struct nft_set_elem *elem) |
8411b644 PNA |
3894 | { |
3895 | struct nft_trans *trans; | |
3896 | int err; | |
3897 | ||
3898 | trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, | |
3899 | sizeof(struct nft_trans_elem), GFP_ATOMIC); | |
3900 | if (!trans) | |
3901 | return -ENOMEM; | |
3902 | ||
1ba1c414 | 3903 | if (!set->ops->flush(ctx->net, set, elem->priv)) { |
8411b644 PNA |
3904 | err = -ENOENT; |
3905 | goto err1; | |
3906 | } | |
b2c11e4b | 3907 | set->ndeact++; |
8411b644 | 3908 | |
de70185d PNA |
3909 | nft_trans_elem_set(trans) = set; |
3910 | nft_trans_elem(trans) = *elem; | |
8411b644 PNA |
3911 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
3912 | ||
3913 | return 0; | |
3914 | err1: | |
3915 | kfree(trans); | |
3916 | return err; | |
3917 | } | |
3918 | ||
633c9a84 PNA |
3919 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
3920 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
20a69341 PM |
3921 | const struct nlattr * const nla[]) |
3922 | { | |
f2a6d766 | 3923 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3924 | const struct nlattr *attr; |
3925 | struct nft_set *set; | |
3926 | struct nft_ctx ctx; | |
60319eb1 | 3927 | int rem, err = 0; |
20a69341 | 3928 | |
f2a6d766 | 3929 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3930 | if (err < 0) |
3931 | return err; | |
3932 | ||
37a9cc52 PNA |
3933 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3934 | genmask); | |
20a69341 PM |
3935 | if (IS_ERR(set)) |
3936 | return PTR_ERR(set); | |
3937 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
3938 | return -EBUSY; | |
3939 | ||
8411b644 | 3940 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) { |
baa2d42c PNA |
3941 | struct nft_set_iter iter = { |
3942 | .genmask = genmask, | |
3943 | .fn = nft_flush_set, | |
1f48ff6c | 3944 | .flush = true, |
8411b644 | 3945 | }; |
baa2d42c | 3946 | set->ops->walk(&ctx, set, &iter); |
8411b644 | 3947 | |
baa2d42c | 3948 | return iter.err; |
8411b644 PNA |
3949 | } |
3950 | ||
20a69341 PM |
3951 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
3952 | err = nft_del_setelem(&ctx, set, attr); | |
3953 | if (err < 0) | |
60319eb1 | 3954 | break; |
4fefee57 | 3955 | |
3dd0673a | 3956 | set->ndeact++; |
20a69341 | 3957 | } |
60319eb1 | 3958 | return err; |
20a69341 PM |
3959 | } |
3960 | ||
cfed7e1b PM |
3961 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
3962 | { | |
3963 | struct nft_set_gc_batch *gcb; | |
3964 | unsigned int i; | |
3965 | ||
3966 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
3967 | for (i = 0; i < gcb->head.cnt; i++) | |
61f9e292 | 3968 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); |
cfed7e1b PM |
3969 | kfree(gcb); |
3970 | } | |
3971 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
3972 | ||
3973 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
3974 | gfp_t gfp) | |
3975 | { | |
3976 | struct nft_set_gc_batch *gcb; | |
3977 | ||
3978 | gcb = kzalloc(sizeof(*gcb), gfp); | |
3979 | if (gcb == NULL) | |
3980 | return gcb; | |
3981 | gcb->head.set = set; | |
3982 | return gcb; | |
3983 | } | |
3984 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
3985 | ||
e5009240 PNA |
3986 | /* |
3987 | * Stateful objects | |
3988 | */ | |
3989 | ||
3990 | /** | |
3991 | * nft_register_obj- register nf_tables stateful object type | |
3992 | * @obj: object type | |
3993 | * | |
3994 | * Registers the object type for use with nf_tables. Returns zero on | |
3995 | * success or a negative errno code otherwise. | |
3996 | */ | |
3997 | int nft_register_obj(struct nft_object_type *obj_type) | |
3998 | { | |
3999 | if (obj_type->type == NFT_OBJECT_UNSPEC) | |
4000 | return -EINVAL; | |
4001 | ||
4002 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4003 | list_add_rcu(&obj_type->list, &nf_tables_objects); | |
4004 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4005 | return 0; | |
4006 | } | |
4007 | EXPORT_SYMBOL_GPL(nft_register_obj); | |
4008 | ||
4009 | /** | |
4010 | * nft_unregister_obj - unregister nf_tables object type | |
4011 | * @obj: object type | |
4012 | * | |
4013 | * Unregisters the object type for use with nf_tables. | |
4014 | */ | |
4015 | void nft_unregister_obj(struct nft_object_type *obj_type) | |
4016 | { | |
4017 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4018 | list_del_rcu(&obj_type->list); | |
4019 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4020 | } | |
4021 | EXPORT_SYMBOL_GPL(nft_unregister_obj); | |
4022 | ||
4023 | struct nft_object *nf_tables_obj_lookup(const struct nft_table *table, | |
4024 | const struct nlattr *nla, | |
4025 | u32 objtype, u8 genmask) | |
4026 | { | |
4027 | struct nft_object *obj; | |
4028 | ||
4029 | list_for_each_entry(obj, &table->objects, list) { | |
4030 | if (!nla_strcmp(nla, obj->name) && | |
4031 | objtype == obj->type->type && | |
4032 | nft_active_genmask(obj, genmask)) | |
4033 | return obj; | |
4034 | } | |
4035 | return ERR_PTR(-ENOENT); | |
4036 | } | |
4037 | EXPORT_SYMBOL_GPL(nf_tables_obj_lookup); | |
4038 | ||
4039 | static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { | |
b2fbd044 LZ |
4040 | [NFTA_OBJ_TABLE] = { .type = NLA_STRING, |
4041 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
4042 | [NFTA_OBJ_NAME] = { .type = NLA_STRING, | |
4043 | .len = NFT_OBJ_MAXNAMELEN - 1 }, | |
e5009240 PNA |
4044 | [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, |
4045 | [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, | |
4046 | }; | |
4047 | ||
4048 | static struct nft_object *nft_obj_init(const struct nft_object_type *type, | |
4049 | const struct nlattr *attr) | |
4050 | { | |
4051 | struct nlattr *tb[type->maxattr + 1]; | |
4052 | struct nft_object *obj; | |
4053 | int err; | |
4054 | ||
4055 | if (attr) { | |
4056 | err = nla_parse_nested(tb, type->maxattr, attr, type->policy); | |
4057 | if (err < 0) | |
4058 | goto err1; | |
4059 | } else { | |
4060 | memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); | |
4061 | } | |
4062 | ||
4063 | err = -ENOMEM; | |
4064 | obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL); | |
4065 | if (obj == NULL) | |
4066 | goto err1; | |
4067 | ||
4068 | err = type->init((const struct nlattr * const *)tb, obj); | |
4069 | if (err < 0) | |
4070 | goto err2; | |
4071 | ||
4072 | obj->type = type; | |
4073 | return obj; | |
4074 | err2: | |
4075 | kfree(obj); | |
4076 | err1: | |
4077 | return ERR_PTR(err); | |
4078 | } | |
4079 | ||
4080 | static int nft_object_dump(struct sk_buff *skb, unsigned int attr, | |
43da04a5 | 4081 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4082 | { |
4083 | struct nlattr *nest; | |
4084 | ||
4085 | nest = nla_nest_start(skb, attr); | |
4086 | if (!nest) | |
4087 | goto nla_put_failure; | |
43da04a5 | 4088 | if (obj->type->dump(skb, obj, reset) < 0) |
e5009240 PNA |
4089 | goto nla_put_failure; |
4090 | nla_nest_end(skb, nest); | |
4091 | return 0; | |
4092 | ||
4093 | nla_put_failure: | |
4094 | return -1; | |
4095 | } | |
4096 | ||
4097 | static const struct nft_object_type *__nft_obj_type_get(u32 objtype) | |
4098 | { | |
4099 | const struct nft_object_type *type; | |
4100 | ||
4101 | list_for_each_entry(type, &nf_tables_objects, list) { | |
4102 | if (objtype == type->type) | |
4103 | return type; | |
4104 | } | |
4105 | return NULL; | |
4106 | } | |
4107 | ||
4108 | static const struct nft_object_type *nft_obj_type_get(u32 objtype) | |
4109 | { | |
4110 | const struct nft_object_type *type; | |
4111 | ||
4112 | type = __nft_obj_type_get(objtype); | |
4113 | if (type != NULL && try_module_get(type->owner)) | |
4114 | return type; | |
4115 | ||
4116 | #ifdef CONFIG_MODULES | |
4117 | if (type == NULL) { | |
4118 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4119 | request_module("nft-obj-%u", objtype); | |
4120 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4121 | if (__nft_obj_type_get(objtype)) | |
4122 | return ERR_PTR(-EAGAIN); | |
4123 | } | |
4124 | #endif | |
4125 | return ERR_PTR(-ENOENT); | |
4126 | } | |
4127 | ||
4128 | static int nf_tables_newobj(struct net *net, struct sock *nlsk, | |
4129 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
4130 | const struct nlattr * const nla[]) | |
4131 | { | |
4132 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4133 | const struct nft_object_type *type; | |
4134 | u8 genmask = nft_genmask_next(net); | |
4135 | int family = nfmsg->nfgen_family; | |
4136 | struct nft_af_info *afi; | |
4137 | struct nft_table *table; | |
4138 | struct nft_object *obj; | |
4139 | struct nft_ctx ctx; | |
4140 | u32 objtype; | |
4141 | int err; | |
4142 | ||
4143 | if (!nla[NFTA_OBJ_TYPE] || | |
4144 | !nla[NFTA_OBJ_NAME] || | |
4145 | !nla[NFTA_OBJ_DATA]) | |
4146 | return -EINVAL; | |
4147 | ||
4148 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4149 | if (IS_ERR(afi)) | |
4150 | return PTR_ERR(afi); | |
4151 | ||
4152 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4153 | if (IS_ERR(table)) | |
4154 | return PTR_ERR(table); | |
4155 | ||
4156 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4157 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4158 | if (IS_ERR(obj)) { | |
4159 | err = PTR_ERR(obj); | |
4160 | if (err != -ENOENT) | |
4161 | return err; | |
4162 | ||
1a28ad74 | 4163 | } else { |
e5009240 PNA |
4164 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
4165 | return -EEXIST; | |
4166 | ||
4167 | return 0; | |
4168 | } | |
4169 | ||
4170 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4171 | ||
4172 | type = nft_obj_type_get(objtype); | |
4173 | if (IS_ERR(type)) | |
4174 | return PTR_ERR(type); | |
4175 | ||
4176 | obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]); | |
4177 | if (IS_ERR(obj)) { | |
4178 | err = PTR_ERR(obj); | |
4179 | goto err1; | |
4180 | } | |
18965317 | 4181 | obj->table = table; |
e5009240 PNA |
4182 | nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN); |
4183 | ||
4184 | err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); | |
4185 | if (err < 0) | |
4186 | goto err2; | |
4187 | ||
4188 | list_add_tail_rcu(&obj->list, &table->objects); | |
4189 | table->use++; | |
4190 | return 0; | |
4191 | err2: | |
4192 | if (obj->type->destroy) | |
4193 | obj->type->destroy(obj); | |
4194 | kfree(obj); | |
4195 | err1: | |
4196 | module_put(type->owner); | |
4197 | return err; | |
4198 | } | |
4199 | ||
4200 | static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, | |
4201 | u32 portid, u32 seq, int event, u32 flags, | |
4202 | int family, const struct nft_table *table, | |
43da04a5 | 4203 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4204 | { |
4205 | struct nfgenmsg *nfmsg; | |
4206 | struct nlmsghdr *nlh; | |
4207 | ||
4208 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
4209 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
4210 | if (nlh == NULL) | |
4211 | goto nla_put_failure; | |
4212 | ||
4213 | nfmsg = nlmsg_data(nlh); | |
4214 | nfmsg->nfgen_family = family; | |
4215 | nfmsg->version = NFNETLINK_V0; | |
4216 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4217 | ||
4218 | if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || | |
4219 | nla_put_string(skb, NFTA_OBJ_NAME, obj->name) || | |
4220 | nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) || | |
4221 | nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || | |
43da04a5 | 4222 | nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset)) |
e5009240 PNA |
4223 | goto nla_put_failure; |
4224 | ||
4225 | nlmsg_end(skb, nlh); | |
4226 | return 0; | |
4227 | ||
4228 | nla_put_failure: | |
4229 | nlmsg_trim(skb, nlh); | |
4230 | return -1; | |
4231 | } | |
4232 | ||
a9fea2a3 PNA |
4233 | struct nft_obj_filter { |
4234 | char table[NFT_OBJ_MAXNAMELEN]; | |
4235 | u32 type; | |
4236 | }; | |
4237 | ||
e5009240 PNA |
4238 | static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) |
4239 | { | |
4240 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
4241 | const struct nft_af_info *afi; | |
4242 | const struct nft_table *table; | |
e5009240 | 4243 | unsigned int idx = 0, s_idx = cb->args[0]; |
a9fea2a3 | 4244 | struct nft_obj_filter *filter = cb->data; |
e5009240 PNA |
4245 | struct net *net = sock_net(skb->sk); |
4246 | int family = nfmsg->nfgen_family; | |
43da04a5 PNA |
4247 | struct nft_object *obj; |
4248 | bool reset = false; | |
4249 | ||
4250 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) | |
4251 | reset = true; | |
e5009240 PNA |
4252 | |
4253 | rcu_read_lock(); | |
4254 | cb->seq = net->nft.base_seq; | |
4255 | ||
4256 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
4257 | if (family != NFPROTO_UNSPEC && family != afi->family) | |
4258 | continue; | |
4259 | ||
4260 | list_for_each_entry_rcu(table, &afi->tables, list) { | |
4261 | list_for_each_entry_rcu(obj, &table->objects, list) { | |
4262 | if (!nft_is_active(net, obj)) | |
4263 | goto cont; | |
4264 | if (idx < s_idx) | |
4265 | goto cont; | |
4266 | if (idx > s_idx) | |
4267 | memset(&cb->args[1], 0, | |
4268 | sizeof(cb->args) - sizeof(cb->args[0])); | |
d21e540b | 4269 | if (filter && filter->table[0] && |
a9fea2a3 PNA |
4270 | strcmp(filter->table, table->name)) |
4271 | goto cont; | |
d21e540b LZ |
4272 | if (filter && |
4273 | filter->type != NFT_OBJECT_UNSPEC && | |
a9fea2a3 PNA |
4274 | obj->type->type != filter->type) |
4275 | goto cont; | |
4276 | ||
e5009240 PNA |
4277 | if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, |
4278 | cb->nlh->nlmsg_seq, | |
4279 | NFT_MSG_NEWOBJ, | |
4280 | NLM_F_MULTI | NLM_F_APPEND, | |
43da04a5 | 4281 | afi->family, table, obj, reset) < 0) |
e5009240 PNA |
4282 | goto done; |
4283 | ||
4284 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
4285 | cont: | |
4286 | idx++; | |
4287 | } | |
4288 | } | |
4289 | } | |
4290 | done: | |
4291 | rcu_read_unlock(); | |
4292 | ||
4293 | cb->args[0] = idx; | |
4294 | return skb->len; | |
4295 | } | |
4296 | ||
a9fea2a3 PNA |
4297 | static int nf_tables_dump_obj_done(struct netlink_callback *cb) |
4298 | { | |
4299 | kfree(cb->data); | |
4300 | ||
4301 | return 0; | |
4302 | } | |
4303 | ||
4304 | static struct nft_obj_filter * | |
4305 | nft_obj_filter_alloc(const struct nlattr * const nla[]) | |
4306 | { | |
4307 | struct nft_obj_filter *filter; | |
4308 | ||
4309 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); | |
4310 | if (!filter) | |
4311 | return ERR_PTR(-ENOMEM); | |
4312 | ||
4313 | if (nla[NFTA_OBJ_TABLE]) | |
4314 | nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE], | |
4315 | NFT_TABLE_MAXNAMELEN); | |
4316 | if (nla[NFTA_OBJ_TYPE]) | |
4317 | filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4318 | ||
4319 | return filter; | |
4320 | } | |
4321 | ||
e5009240 PNA |
4322 | static int nf_tables_getobj(struct net *net, struct sock *nlsk, |
4323 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
4324 | const struct nlattr * const nla[]) | |
4325 | { | |
4326 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4327 | u8 genmask = nft_genmask_cur(net); | |
4328 | int family = nfmsg->nfgen_family; | |
4329 | const struct nft_af_info *afi; | |
4330 | const struct nft_table *table; | |
4331 | struct nft_object *obj; | |
4332 | struct sk_buff *skb2; | |
43da04a5 | 4333 | bool reset = false; |
e5009240 PNA |
4334 | u32 objtype; |
4335 | int err; | |
4336 | ||
4337 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
4338 | struct netlink_dump_control c = { | |
4339 | .dump = nf_tables_dump_obj, | |
a9fea2a3 | 4340 | .done = nf_tables_dump_obj_done, |
e5009240 | 4341 | }; |
a9fea2a3 PNA |
4342 | |
4343 | if (nla[NFTA_OBJ_TABLE] || | |
4344 | nla[NFTA_OBJ_TYPE]) { | |
4345 | struct nft_obj_filter *filter; | |
4346 | ||
4347 | filter = nft_obj_filter_alloc(nla); | |
4348 | if (IS_ERR(filter)) | |
4349 | return -ENOMEM; | |
4350 | ||
4351 | c.data = filter; | |
4352 | } | |
e5009240 PNA |
4353 | return netlink_dump_start(nlsk, skb, nlh, &c); |
4354 | } | |
4355 | ||
4356 | if (!nla[NFTA_OBJ_NAME] || | |
4357 | !nla[NFTA_OBJ_TYPE]) | |
4358 | return -EINVAL; | |
4359 | ||
4360 | afi = nf_tables_afinfo_lookup(net, family, false); | |
4361 | if (IS_ERR(afi)) | |
4362 | return PTR_ERR(afi); | |
4363 | ||
4364 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4365 | if (IS_ERR(table)) | |
4366 | return PTR_ERR(table); | |
4367 | ||
4368 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4369 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4370 | if (IS_ERR(obj)) | |
4371 | return PTR_ERR(obj); | |
4372 | ||
4373 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4374 | if (!skb2) | |
4375 | return -ENOMEM; | |
4376 | ||
43da04a5 PNA |
4377 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) |
4378 | reset = true; | |
4379 | ||
e5009240 PNA |
4380 | err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, |
4381 | nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, | |
43da04a5 | 4382 | family, table, obj, reset); |
e5009240 PNA |
4383 | if (err < 0) |
4384 | goto err; | |
4385 | ||
4386 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4387 | err: | |
4388 | kfree_skb(skb2); | |
4389 | return err; | |
4390 | ||
4391 | return 0; | |
4392 | } | |
4393 | ||
4394 | static void nft_obj_destroy(struct nft_object *obj) | |
4395 | { | |
4396 | if (obj->type->destroy) | |
4397 | obj->type->destroy(obj); | |
4398 | ||
4399 | module_put(obj->type->owner); | |
4400 | kfree(obj); | |
4401 | } | |
4402 | ||
4403 | static int nf_tables_delobj(struct net *net, struct sock *nlsk, | |
4404 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
4405 | const struct nlattr * const nla[]) | |
4406 | { | |
4407 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4408 | u8 genmask = nft_genmask_next(net); | |
4409 | int family = nfmsg->nfgen_family; | |
4410 | struct nft_af_info *afi; | |
4411 | struct nft_table *table; | |
4412 | struct nft_object *obj; | |
4413 | struct nft_ctx ctx; | |
4414 | u32 objtype; | |
4415 | ||
4416 | if (!nla[NFTA_OBJ_TYPE] || | |
4417 | !nla[NFTA_OBJ_NAME]) | |
4418 | return -EINVAL; | |
4419 | ||
4420 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4421 | if (IS_ERR(afi)) | |
4422 | return PTR_ERR(afi); | |
4423 | ||
4424 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4425 | if (IS_ERR(table)) | |
4426 | return PTR_ERR(table); | |
4427 | ||
4428 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4429 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4430 | if (IS_ERR(obj)) | |
4431 | return PTR_ERR(obj); | |
4432 | if (obj->use > 0) | |
4433 | return -EBUSY; | |
4434 | ||
4435 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4436 | ||
4437 | return nft_delobj(&ctx, obj); | |
4438 | } | |
4439 | ||
2599e989 PNA |
4440 | int nft_obj_notify(struct net *net, struct nft_table *table, |
4441 | struct nft_object *obj, u32 portid, u32 seq, int event, | |
4442 | int family, int report, gfp_t gfp) | |
e5009240 PNA |
4443 | { |
4444 | struct sk_buff *skb; | |
4445 | int err; | |
4446 | ||
2599e989 PNA |
4447 | if (!report && |
4448 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
e5009240 PNA |
4449 | return 0; |
4450 | ||
4451 | err = -ENOBUFS; | |
2599e989 | 4452 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp); |
e5009240 PNA |
4453 | if (skb == NULL) |
4454 | goto err; | |
4455 | ||
2599e989 PNA |
4456 | err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family, |
4457 | table, obj, false); | |
e5009240 PNA |
4458 | if (err < 0) { |
4459 | kfree_skb(skb); | |
4460 | goto err; | |
4461 | } | |
4462 | ||
2599e989 | 4463 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp); |
e5009240 PNA |
4464 | err: |
4465 | if (err < 0) { | |
2599e989 | 4466 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); |
e5009240 PNA |
4467 | } |
4468 | return err; | |
4469 | } | |
2599e989 PNA |
4470 | EXPORT_SYMBOL_GPL(nft_obj_notify); |
4471 | ||
4472 | static int nf_tables_obj_notify(const struct nft_ctx *ctx, | |
4473 | struct nft_object *obj, int event) | |
4474 | { | |
4475 | return nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, | |
4476 | ctx->seq, event, ctx->afi->family, ctx->report, | |
4477 | GFP_KERNEL); | |
4478 | } | |
e5009240 | 4479 | |
84d7fce6 PNA |
4480 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
4481 | u32 portid, u32 seq) | |
4482 | { | |
4483 | struct nlmsghdr *nlh; | |
4484 | struct nfgenmsg *nfmsg; | |
4485 | int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN; | |
4486 | ||
4487 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
4488 | if (nlh == NULL) | |
4489 | goto nla_put_failure; | |
4490 | ||
4491 | nfmsg = nlmsg_data(nlh); | |
4492 | nfmsg->nfgen_family = AF_UNSPEC; | |
4493 | nfmsg->version = NFNETLINK_V0; | |
4494 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4495 | ||
4496 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq))) | |
4497 | goto nla_put_failure; | |
4498 | ||
053c095a JB |
4499 | nlmsg_end(skb, nlh); |
4500 | return 0; | |
84d7fce6 PNA |
4501 | |
4502 | nla_put_failure: | |
4503 | nlmsg_trim(skb, nlh); | |
4504 | return -EMSGSIZE; | |
4505 | } | |
4506 | ||
4507 | static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event) | |
4508 | { | |
4509 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
4510 | struct sk_buff *skb2; | |
4511 | int err; | |
4512 | ||
4513 | if (nlmsg_report(nlh) && | |
4514 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
4515 | return 0; | |
4516 | ||
4517 | err = -ENOBUFS; | |
4518 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
4519 | if (skb2 == NULL) | |
4520 | goto err; | |
4521 | ||
4522 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
4523 | nlh->nlmsg_seq); | |
4524 | if (err < 0) { | |
4525 | kfree_skb(skb2); | |
4526 | goto err; | |
4527 | } | |
4528 | ||
4529 | err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, | |
4530 | NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL); | |
4531 | err: | |
4532 | if (err < 0) { | |
4533 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, | |
4534 | err); | |
4535 | } | |
4536 | return err; | |
4537 | } | |
4538 | ||
7b8002a1 PNA |
4539 | static int nf_tables_getgen(struct net *net, struct sock *nlsk, |
4540 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
84d7fce6 PNA |
4541 | const struct nlattr * const nla[]) |
4542 | { | |
84d7fce6 PNA |
4543 | struct sk_buff *skb2; |
4544 | int err; | |
4545 | ||
4546 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4547 | if (skb2 == NULL) | |
4548 | return -ENOMEM; | |
4549 | ||
4550 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
4551 | nlh->nlmsg_seq); | |
4552 | if (err < 0) | |
4553 | goto err; | |
4554 | ||
4555 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4556 | err: | |
4557 | kfree_skb(skb2); | |
4558 | return err; | |
4559 | } | |
4560 | ||
96518518 PM |
4561 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
4562 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 4563 | .call_batch = nf_tables_newtable, |
96518518 PM |
4564 | .attr_count = NFTA_TABLE_MAX, |
4565 | .policy = nft_table_policy, | |
4566 | }, | |
4567 | [NFT_MSG_GETTABLE] = { | |
4568 | .call = nf_tables_gettable, | |
4569 | .attr_count = NFTA_TABLE_MAX, | |
4570 | .policy = nft_table_policy, | |
4571 | }, | |
4572 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 4573 | .call_batch = nf_tables_deltable, |
96518518 PM |
4574 | .attr_count = NFTA_TABLE_MAX, |
4575 | .policy = nft_table_policy, | |
4576 | }, | |
4577 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 4578 | .call_batch = nf_tables_newchain, |
96518518 PM |
4579 | .attr_count = NFTA_CHAIN_MAX, |
4580 | .policy = nft_chain_policy, | |
4581 | }, | |
4582 | [NFT_MSG_GETCHAIN] = { | |
4583 | .call = nf_tables_getchain, | |
4584 | .attr_count = NFTA_CHAIN_MAX, | |
4585 | .policy = nft_chain_policy, | |
4586 | }, | |
4587 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 4588 | .call_batch = nf_tables_delchain, |
96518518 PM |
4589 | .attr_count = NFTA_CHAIN_MAX, |
4590 | .policy = nft_chain_policy, | |
4591 | }, | |
4592 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 4593 | .call_batch = nf_tables_newrule, |
96518518 PM |
4594 | .attr_count = NFTA_RULE_MAX, |
4595 | .policy = nft_rule_policy, | |
4596 | }, | |
4597 | [NFT_MSG_GETRULE] = { | |
4598 | .call = nf_tables_getrule, | |
4599 | .attr_count = NFTA_RULE_MAX, | |
4600 | .policy = nft_rule_policy, | |
4601 | }, | |
4602 | [NFT_MSG_DELRULE] = { | |
0628b123 | 4603 | .call_batch = nf_tables_delrule, |
96518518 PM |
4604 | .attr_count = NFTA_RULE_MAX, |
4605 | .policy = nft_rule_policy, | |
4606 | }, | |
20a69341 | 4607 | [NFT_MSG_NEWSET] = { |
958bee14 | 4608 | .call_batch = nf_tables_newset, |
20a69341 PM |
4609 | .attr_count = NFTA_SET_MAX, |
4610 | .policy = nft_set_policy, | |
4611 | }, | |
4612 | [NFT_MSG_GETSET] = { | |
4613 | .call = nf_tables_getset, | |
4614 | .attr_count = NFTA_SET_MAX, | |
4615 | .policy = nft_set_policy, | |
4616 | }, | |
4617 | [NFT_MSG_DELSET] = { | |
958bee14 | 4618 | .call_batch = nf_tables_delset, |
20a69341 PM |
4619 | .attr_count = NFTA_SET_MAX, |
4620 | .policy = nft_set_policy, | |
4621 | }, | |
4622 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 4623 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
4624 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
4625 | .policy = nft_set_elem_list_policy, | |
4626 | }, | |
4627 | [NFT_MSG_GETSETELEM] = { | |
4628 | .call = nf_tables_getsetelem, | |
4629 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
4630 | .policy = nft_set_elem_list_policy, | |
4631 | }, | |
4632 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 4633 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
4634 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
4635 | .policy = nft_set_elem_list_policy, | |
4636 | }, | |
84d7fce6 PNA |
4637 | [NFT_MSG_GETGEN] = { |
4638 | .call = nf_tables_getgen, | |
4639 | }, | |
e5009240 PNA |
4640 | [NFT_MSG_NEWOBJ] = { |
4641 | .call_batch = nf_tables_newobj, | |
4642 | .attr_count = NFTA_OBJ_MAX, | |
4643 | .policy = nft_obj_policy, | |
4644 | }, | |
4645 | [NFT_MSG_GETOBJ] = { | |
4646 | .call = nf_tables_getobj, | |
4647 | .attr_count = NFTA_OBJ_MAX, | |
4648 | .policy = nft_obj_policy, | |
4649 | }, | |
4650 | [NFT_MSG_DELOBJ] = { | |
4651 | .call_batch = nf_tables_delobj, | |
4652 | .attr_count = NFTA_OBJ_MAX, | |
4653 | .policy = nft_obj_policy, | |
4654 | }, | |
43da04a5 PNA |
4655 | [NFT_MSG_GETOBJ_RESET] = { |
4656 | .call = nf_tables_getobj, | |
4657 | .attr_count = NFTA_OBJ_MAX, | |
4658 | .policy = nft_obj_policy, | |
4659 | }, | |
96518518 PM |
4660 | }; |
4661 | ||
91c7b38d PNA |
4662 | static void nft_chain_commit_update(struct nft_trans *trans) |
4663 | { | |
4664 | struct nft_base_chain *basechain; | |
4665 | ||
4666 | if (nft_trans_chain_name(trans)[0]) | |
4667 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); | |
4668 | ||
4669 | if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN)) | |
4670 | return; | |
4671 | ||
4672 | basechain = nft_base_chain(trans->ctx.chain); | |
4673 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
4674 | ||
4675 | switch (nft_trans_chain_policy(trans)) { | |
4676 | case NF_DROP: | |
4677 | case NF_ACCEPT: | |
4678 | basechain->policy = nft_trans_chain_policy(trans); | |
4679 | break; | |
4680 | } | |
4681 | } | |
4682 | ||
b326dd37 | 4683 | static void nf_tables_commit_release(struct nft_trans *trans) |
c7c32e72 | 4684 | { |
c7c32e72 PNA |
4685 | switch (trans->msg_type) { |
4686 | case NFT_MSG_DELTABLE: | |
4687 | nf_tables_table_destroy(&trans->ctx); | |
4688 | break; | |
4689 | case NFT_MSG_DELCHAIN: | |
4690 | nf_tables_chain_destroy(trans->ctx.chain); | |
4691 | break; | |
4692 | case NFT_MSG_DELRULE: | |
4693 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
4694 | break; | |
4695 | case NFT_MSG_DELSET: | |
4696 | nft_set_destroy(nft_trans_set(trans)); | |
4697 | break; | |
61edafbb PM |
4698 | case NFT_MSG_DELSETELEM: |
4699 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 4700 | nft_trans_elem(trans).priv, true); |
61edafbb | 4701 | break; |
e5009240 PNA |
4702 | case NFT_MSG_DELOBJ: |
4703 | nft_obj_destroy(nft_trans_obj(trans)); | |
4704 | break; | |
c7c32e72 PNA |
4705 | } |
4706 | kfree(trans); | |
4707 | } | |
4708 | ||
5913beaf | 4709 | static int nf_tables_commit(struct net *net, struct sk_buff *skb) |
37082f93 | 4710 | { |
37082f93 | 4711 | struct nft_trans *trans, *next; |
a3716e70 | 4712 | struct nft_trans_elem *te; |
37082f93 PNA |
4713 | |
4714 | /* Bump generation counter, invalidate any dump in progress */ | |
38e029f1 | 4715 | while (++net->nft.base_seq == 0); |
37082f93 PNA |
4716 | |
4717 | /* A new generation has just started */ | |
ea4bd995 | 4718 | net->nft.gencursor = nft_gencursor_next(net); |
37082f93 PNA |
4719 | |
4720 | /* Make sure all packets have left the previous generation before | |
4721 | * purging old rules. | |
4722 | */ | |
4723 | synchronize_rcu(); | |
4724 | ||
4725 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 4726 | switch (trans->msg_type) { |
55dd6f93 PNA |
4727 | case NFT_MSG_NEWTABLE: |
4728 | if (nft_trans_table_update(trans)) { | |
4729 | if (!nft_trans_table_enable(trans)) { | |
664b0f8c PNA |
4730 | nf_tables_table_disable(net, |
4731 | trans->ctx.afi, | |
55dd6f93 PNA |
4732 | trans->ctx.table); |
4733 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
4734 | } | |
4735 | } else { | |
f2a6d766 | 4736 | nft_clear(net, trans->ctx.table); |
55dd6f93 | 4737 | } |
35151d84 | 4738 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
4739 | nft_trans_destroy(trans); |
4740 | break; | |
4741 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 4742 | list_del_rcu(&trans->ctx.table->list); |
35151d84 | 4743 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 4744 | break; |
91c7b38d PNA |
4745 | case NFT_MSG_NEWCHAIN: |
4746 | if (nft_trans_chain_update(trans)) | |
4747 | nft_chain_commit_update(trans); | |
4fefee57 | 4748 | else |
664b0f8c | 4749 | nft_clear(net, trans->ctx.chain); |
4fefee57 | 4750 | |
35151d84 | 4751 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
4752 | nft_trans_destroy(trans); |
4753 | break; | |
4754 | case NFT_MSG_DELCHAIN: | |
664b0f8c | 4755 | list_del_rcu(&trans->ctx.chain->list); |
35151d84 | 4756 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
82bec71d PNA |
4757 | nf_tables_unregister_hooks(trans->ctx.net, |
4758 | trans->ctx.table, | |
c5598794 AB |
4759 | trans->ctx.chain, |
4760 | trans->ctx.afi->nops); | |
91c7b38d | 4761 | break; |
b380e5c7 | 4762 | case NFT_MSG_NEWRULE: |
889f7ee7 | 4763 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
35151d84 | 4764 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 4765 | nft_trans_rule(trans), |
35151d84 | 4766 | NFT_MSG_NEWRULE); |
37082f93 | 4767 | nft_trans_destroy(trans); |
b380e5c7 PNA |
4768 | break; |
4769 | case NFT_MSG_DELRULE: | |
4770 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
4771 | nf_tables_rule_notify(&trans->ctx, |
4772 | nft_trans_rule(trans), | |
4773 | NFT_MSG_DELRULE); | |
b380e5c7 | 4774 | break; |
958bee14 | 4775 | case NFT_MSG_NEWSET: |
37a9cc52 | 4776 | nft_clear(net, nft_trans_set(trans)); |
4fefee57 PNA |
4777 | /* This avoids hitting -EBUSY when deleting the table |
4778 | * from the transaction. | |
4779 | */ | |
4780 | if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS && | |
4781 | !list_empty(&nft_trans_set(trans)->bindings)) | |
4782 | trans->ctx.table->use--; | |
4783 | ||
958bee14 | 4784 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 4785 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
4786 | nft_trans_destroy(trans); |
4787 | break; | |
4788 | case NFT_MSG_DELSET: | |
37a9cc52 | 4789 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 | 4790 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 4791 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 4792 | break; |
60319eb1 | 4793 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
4794 | te = (struct nft_trans_elem *)trans->data; |
4795 | ||
42a55769 | 4796 | te->set->ops->activate(net, te->set, &te->elem); |
cc02e457 PM |
4797 | nf_tables_setelem_notify(&trans->ctx, te->set, |
4798 | &te->elem, | |
60319eb1 PNA |
4799 | NFT_MSG_NEWSETELEM, 0); |
4800 | nft_trans_destroy(trans); | |
4801 | break; | |
4802 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 4803 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 4804 | |
a3716e70 PNA |
4805 | nf_tables_setelem_notify(&trans->ctx, te->set, |
4806 | &te->elem, | |
60319eb1 | 4807 | NFT_MSG_DELSETELEM, 0); |
5cb82a38 | 4808 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a PM |
4809 | atomic_dec(&te->set->nelems); |
4810 | te->set->ndeact--; | |
60319eb1 | 4811 | break; |
e5009240 PNA |
4812 | case NFT_MSG_NEWOBJ: |
4813 | nft_clear(net, nft_trans_obj(trans)); | |
4814 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
4815 | NFT_MSG_NEWOBJ); | |
4816 | nft_trans_destroy(trans); | |
4817 | break; | |
4818 | case NFT_MSG_DELOBJ: | |
4819 | list_del_rcu(&nft_trans_obj(trans)->list); | |
4820 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
4821 | NFT_MSG_DELOBJ); | |
4822 | break; | |
37082f93 | 4823 | } |
37082f93 PNA |
4824 | } |
4825 | ||
b326dd37 PNA |
4826 | synchronize_rcu(); |
4827 | ||
37082f93 | 4828 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 | 4829 | list_del(&trans->list); |
b326dd37 | 4830 | nf_tables_commit_release(trans); |
37082f93 | 4831 | } |
84d7fce6 PNA |
4832 | |
4833 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); | |
37082f93 PNA |
4834 | |
4835 | return 0; | |
4836 | } | |
4837 | ||
b326dd37 | 4838 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 4839 | { |
c7c32e72 PNA |
4840 | switch (trans->msg_type) { |
4841 | case NFT_MSG_NEWTABLE: | |
4842 | nf_tables_table_destroy(&trans->ctx); | |
4843 | break; | |
4844 | case NFT_MSG_NEWCHAIN: | |
4845 | nf_tables_chain_destroy(trans->ctx.chain); | |
4846 | break; | |
4847 | case NFT_MSG_NEWRULE: | |
4848 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
4849 | break; | |
4850 | case NFT_MSG_NEWSET: | |
4851 | nft_set_destroy(nft_trans_set(trans)); | |
4852 | break; | |
61edafbb PM |
4853 | case NFT_MSG_NEWSETELEM: |
4854 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 4855 | nft_trans_elem(trans).priv, true); |
61edafbb | 4856 | break; |
e5009240 PNA |
4857 | case NFT_MSG_NEWOBJ: |
4858 | nft_obj_destroy(nft_trans_obj(trans)); | |
4859 | break; | |
c7c32e72 PNA |
4860 | } |
4861 | kfree(trans); | |
4862 | } | |
4863 | ||
5913beaf | 4864 | static int nf_tables_abort(struct net *net, struct sk_buff *skb) |
37082f93 | 4865 | { |
37082f93 | 4866 | struct nft_trans *trans, *next; |
02263db0 | 4867 | struct nft_trans_elem *te; |
37082f93 | 4868 | |
a907e36d XL |
4869 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
4870 | list) { | |
b380e5c7 | 4871 | switch (trans->msg_type) { |
55dd6f93 PNA |
4872 | case NFT_MSG_NEWTABLE: |
4873 | if (nft_trans_table_update(trans)) { | |
4874 | if (nft_trans_table_enable(trans)) { | |
664b0f8c PNA |
4875 | nf_tables_table_disable(net, |
4876 | trans->ctx.afi, | |
55dd6f93 PNA |
4877 | trans->ctx.table); |
4878 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
4879 | } | |
4880 | nft_trans_destroy(trans); | |
4881 | } else { | |
e688a7f8 | 4882 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
4883 | } |
4884 | break; | |
4885 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 4886 | nft_clear(trans->ctx.net, trans->ctx.table); |
55dd6f93 PNA |
4887 | nft_trans_destroy(trans); |
4888 | break; | |
91c7b38d PNA |
4889 | case NFT_MSG_NEWCHAIN: |
4890 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 4891 | free_percpu(nft_trans_chain_stats(trans)); |
91c7b38d PNA |
4892 | |
4893 | nft_trans_destroy(trans); | |
4894 | } else { | |
4fefee57 | 4895 | trans->ctx.table->use--; |
e688a7f8 | 4896 | list_del_rcu(&trans->ctx.chain->list); |
82bec71d PNA |
4897 | nf_tables_unregister_hooks(trans->ctx.net, |
4898 | trans->ctx.table, | |
c5598794 AB |
4899 | trans->ctx.chain, |
4900 | trans->ctx.afi->nops); | |
91c7b38d PNA |
4901 | } |
4902 | break; | |
4903 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 4904 | trans->ctx.table->use++; |
664b0f8c | 4905 | nft_clear(trans->ctx.net, trans->ctx.chain); |
91c7b38d PNA |
4906 | nft_trans_destroy(trans); |
4907 | break; | |
b380e5c7 | 4908 | case NFT_MSG_NEWRULE: |
4fefee57 | 4909 | trans->ctx.chain->use--; |
b380e5c7 PNA |
4910 | list_del_rcu(&nft_trans_rule(trans)->list); |
4911 | break; | |
4912 | case NFT_MSG_DELRULE: | |
4fefee57 | 4913 | trans->ctx.chain->use++; |
889f7ee7 | 4914 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
37082f93 | 4915 | nft_trans_destroy(trans); |
b380e5c7 | 4916 | break; |
958bee14 | 4917 | case NFT_MSG_NEWSET: |
4fefee57 | 4918 | trans->ctx.table->use--; |
e688a7f8 | 4919 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
4920 | break; |
4921 | case NFT_MSG_DELSET: | |
4fefee57 | 4922 | trans->ctx.table->use++; |
37a9cc52 | 4923 | nft_clear(trans->ctx.net, nft_trans_set(trans)); |
958bee14 PNA |
4924 | nft_trans_destroy(trans); |
4925 | break; | |
60319eb1 | 4926 | case NFT_MSG_NEWSETELEM: |
02263db0 | 4927 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 4928 | |
5cb82a38 | 4929 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a | 4930 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
4931 | break; |
4932 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
4933 | te = (struct nft_trans_elem *)trans->data; |
4934 | ||
42a55769 | 4935 | te->set->ops->activate(net, te->set, &te->elem); |
3dd0673a | 4936 | te->set->ndeact--; |
cc02e457 | 4937 | |
e5009240 PNA |
4938 | nft_trans_destroy(trans); |
4939 | break; | |
4940 | case NFT_MSG_NEWOBJ: | |
4941 | trans->ctx.table->use--; | |
4942 | list_del_rcu(&nft_trans_obj(trans)->list); | |
4943 | break; | |
4944 | case NFT_MSG_DELOBJ: | |
4945 | trans->ctx.table->use++; | |
4946 | nft_clear(trans->ctx.net, nft_trans_obj(trans)); | |
60319eb1 PNA |
4947 | nft_trans_destroy(trans); |
4948 | break; | |
37082f93 | 4949 | } |
37082f93 PNA |
4950 | } |
4951 | ||
b326dd37 PNA |
4952 | synchronize_rcu(); |
4953 | ||
a1cee076 PNA |
4954 | list_for_each_entry_safe_reverse(trans, next, |
4955 | &net->nft.commit_list, list) { | |
c7c32e72 | 4956 | list_del(&trans->list); |
b326dd37 | 4957 | nf_tables_abort_release(trans); |
37082f93 PNA |
4958 | } |
4959 | ||
4960 | return 0; | |
4961 | } | |
4962 | ||
96518518 PM |
4963 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
4964 | .name = "nf_tables", | |
4965 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
4966 | .cb_count = NFT_MSG_MAX, | |
4967 | .cb = nf_tables_cb, | |
0628b123 PNA |
4968 | .commit = nf_tables_commit, |
4969 | .abort = nf_tables_abort, | |
96518518 PM |
4970 | }; |
4971 | ||
7210e4e3 PNA |
4972 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
4973 | enum nft_chain_type type) | |
4974 | { | |
4975 | const struct nft_base_chain *basechain; | |
4976 | ||
4977 | if (chain->flags & NFT_BASE_CHAIN) { | |
4978 | basechain = nft_base_chain(chain); | |
4979 | if (basechain->type->type != type) | |
4980 | return -EOPNOTSUPP; | |
4981 | } | |
4982 | return 0; | |
4983 | } | |
4984 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
4985 | ||
75e8d06d PNA |
4986 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
4987 | unsigned int hook_flags) | |
4988 | { | |
4989 | struct nft_base_chain *basechain; | |
4990 | ||
4991 | if (chain->flags & NFT_BASE_CHAIN) { | |
4992 | basechain = nft_base_chain(chain); | |
4993 | ||
4994 | if ((1 << basechain->ops[0].hooknum) & hook_flags) | |
4995 | return 0; | |
4996 | ||
4997 | return -EOPNOTSUPP; | |
4998 | } | |
4999 | ||
5000 | return 0; | |
5001 | } | |
5002 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
5003 | ||
20a69341 PM |
5004 | /* |
5005 | * Loop detection - walk through the ruleset beginning at the destination chain | |
5006 | * of a new jump until either the source chain is reached (loop) or all | |
5007 | * reachable chains have been traversed. | |
5008 | * | |
5009 | * The loop check is performed whenever a new jump verdict is added to an | |
5010 | * expression or verdict map or a verdict map is bound to a new chain. | |
5011 | */ | |
5012 | ||
5013 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
5014 | const struct nft_chain *chain); | |
5015 | ||
5016 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 5017 | struct nft_set *set, |
20a69341 | 5018 | const struct nft_set_iter *iter, |
de70185d | 5019 | struct nft_set_elem *elem) |
20a69341 | 5020 | { |
fe2811eb PM |
5021 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
5022 | const struct nft_data *data; | |
5023 | ||
5024 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
5025 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
5026 | return 0; |
5027 | ||
fe2811eb | 5028 | data = nft_set_ext_data(ext); |
1ca2e170 | 5029 | switch (data->verdict.code) { |
20a69341 PM |
5030 | case NFT_JUMP: |
5031 | case NFT_GOTO: | |
1ca2e170 | 5032 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
5033 | default: |
5034 | return 0; | |
5035 | } | |
5036 | } | |
5037 | ||
5038 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
5039 | const struct nft_chain *chain) | |
5040 | { | |
5041 | const struct nft_rule *rule; | |
5042 | const struct nft_expr *expr, *last; | |
de70185d | 5043 | struct nft_set *set; |
20a69341 PM |
5044 | struct nft_set_binding *binding; |
5045 | struct nft_set_iter iter; | |
20a69341 PM |
5046 | |
5047 | if (ctx->chain == chain) | |
5048 | return -ELOOP; | |
5049 | ||
5050 | list_for_each_entry(rule, &chain->rules, list) { | |
5051 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
5052 | const struct nft_data *data = NULL; |
5053 | int err; | |
5054 | ||
5055 | if (!expr->ops->validate) | |
20a69341 PM |
5056 | continue; |
5057 | ||
0ca743a5 PNA |
5058 | err = expr->ops->validate(ctx, expr, &data); |
5059 | if (err < 0) | |
5060 | return err; | |
5061 | ||
20a69341 | 5062 | if (data == NULL) |
0ca743a5 | 5063 | continue; |
20a69341 | 5064 | |
1ca2e170 | 5065 | switch (data->verdict.code) { |
20a69341 PM |
5066 | case NFT_JUMP: |
5067 | case NFT_GOTO: | |
1ca2e170 PM |
5068 | err = nf_tables_check_loops(ctx, |
5069 | data->verdict.chain); | |
20a69341 PM |
5070 | if (err < 0) |
5071 | return err; | |
5072 | default: | |
5073 | break; | |
5074 | } | |
5075 | } | |
5076 | } | |
5077 | ||
5078 | list_for_each_entry(set, &ctx->table->sets, list) { | |
37a9cc52 PNA |
5079 | if (!nft_is_active_next(ctx->net, set)) |
5080 | continue; | |
20a69341 PM |
5081 | if (!(set->flags & NFT_SET_MAP) || |
5082 | set->dtype != NFT_DATA_VERDICT) | |
5083 | continue; | |
5084 | ||
5085 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
5086 | if (!(binding->flags & NFT_SET_MAP) || |
5087 | binding->chain != chain) | |
20a69341 PM |
5088 | continue; |
5089 | ||
8588ac09 | 5090 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
5091 | iter.skip = 0; |
5092 | iter.count = 0; | |
5093 | iter.err = 0; | |
5094 | iter.fn = nf_tables_loop_check_setelem; | |
1f48ff6c | 5095 | iter.flush = false; |
20a69341 PM |
5096 | |
5097 | set->ops->walk(ctx, set, &iter); | |
5098 | if (iter.err < 0) | |
5099 | return iter.err; | |
5100 | } | |
5101 | } | |
5102 | ||
5103 | return 0; | |
5104 | } | |
5105 | ||
36b701fa LGL |
5106 | /** |
5107 | * nft_parse_u32_check - fetch u32 attribute and check for maximum value | |
5108 | * | |
5109 | * @attr: netlink attribute to fetch value from | |
5110 | * @max: maximum value to be stored in dest | |
5111 | * @dest: pointer to the variable | |
5112 | * | |
5113 | * Parse, check and store a given u32 netlink attribute into variable. | |
5114 | * This function returns -ERANGE if the value goes over maximum value. | |
5115 | * Otherwise a 0 is returned and the attribute value is stored in the | |
5116 | * destination variable. | |
5117 | */ | |
f1d505bb | 5118 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) |
36b701fa | 5119 | { |
09525a09 | 5120 | u32 val; |
36b701fa LGL |
5121 | |
5122 | val = ntohl(nla_get_be32(attr)); | |
5123 | if (val > max) | |
5124 | return -ERANGE; | |
5125 | ||
5126 | *dest = val; | |
5127 | return 0; | |
5128 | } | |
5129 | EXPORT_SYMBOL_GPL(nft_parse_u32_check); | |
5130 | ||
49499c3e PM |
5131 | /** |
5132 | * nft_parse_register - parse a register value from a netlink attribute | |
5133 | * | |
5134 | * @attr: netlink attribute | |
5135 | * | |
5136 | * Parse and translate a register value from a netlink attribute. | |
5137 | * Registers used to be 128 bit wide, these register numbers will be | |
5138 | * mapped to the corresponding 32 bit register numbers. | |
5139 | */ | |
b1c96ed3 PM |
5140 | unsigned int nft_parse_register(const struct nlattr *attr) |
5141 | { | |
49499c3e PM |
5142 | unsigned int reg; |
5143 | ||
5144 | reg = ntohl(nla_get_be32(attr)); | |
5145 | switch (reg) { | |
5146 | case NFT_REG_VERDICT...NFT_REG_4: | |
5147 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
5148 | default: | |
5149 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
5150 | } | |
b1c96ed3 PM |
5151 | } |
5152 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
5153 | ||
49499c3e PM |
5154 | /** |
5155 | * nft_dump_register - dump a register value to a netlink attribute | |
5156 | * | |
5157 | * @skb: socket buffer | |
5158 | * @attr: attribute number | |
5159 | * @reg: register number | |
5160 | * | |
5161 | * Construct a netlink attribute containing the register number. For | |
5162 | * compatibility reasons, register numbers being a multiple of 4 are | |
5163 | * translated to the corresponding 128 bit register numbers. | |
5164 | */ | |
b1c96ed3 PM |
5165 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
5166 | { | |
49499c3e PM |
5167 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
5168 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
5169 | else | |
5170 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
5171 | ||
b1c96ed3 PM |
5172 | return nla_put_be32(skb, attr, htonl(reg)); |
5173 | } | |
5174 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
5175 | ||
96518518 | 5176 | /** |
d07db988 | 5177 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
5178 | * |
5179 | * @reg: the register number | |
d07db988 | 5180 | * @len: the length of the data |
96518518 PM |
5181 | * |
5182 | * Validate that the input register is one of the general purpose | |
d07db988 | 5183 | * registers and that the length of the load is within the bounds. |
96518518 | 5184 | */ |
d07db988 | 5185 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 5186 | { |
49499c3e | 5187 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 5188 | return -EINVAL; |
d07db988 PM |
5189 | if (len == 0) |
5190 | return -EINVAL; | |
49499c3e | 5191 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 5192 | return -ERANGE; |
49499c3e | 5193 | |
96518518 PM |
5194 | return 0; |
5195 | } | |
d07db988 | 5196 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 5197 | |
96518518 | 5198 | /** |
1ec10212 | 5199 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
5200 | * |
5201 | * @ctx: context of the expression performing the load | |
5202 | * @reg: the destination register number | |
5203 | * @data: the data to load | |
5204 | * @type: the data type | |
45d9bcda | 5205 | * @len: the length of the data |
96518518 PM |
5206 | * |
5207 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
5208 | * the destination register and the length is within the bounds. |
5209 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 5210 | * data. |
96518518 | 5211 | */ |
1ec10212 PM |
5212 | int nft_validate_register_store(const struct nft_ctx *ctx, |
5213 | enum nft_registers reg, | |
5214 | const struct nft_data *data, | |
5215 | enum nft_data_types type, unsigned int len) | |
96518518 | 5216 | { |
20a69341 PM |
5217 | int err; |
5218 | ||
96518518 PM |
5219 | switch (reg) { |
5220 | case NFT_REG_VERDICT: | |
58f40ab6 | 5221 | if (type != NFT_DATA_VERDICT) |
96518518 | 5222 | return -EINVAL; |
20a69341 | 5223 | |
58f40ab6 | 5224 | if (data != NULL && |
1ca2e170 PM |
5225 | (data->verdict.code == NFT_GOTO || |
5226 | data->verdict.code == NFT_JUMP)) { | |
5227 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
5228 | if (err < 0) |
5229 | return err; | |
5230 | ||
1ca2e170 PM |
5231 | if (ctx->chain->level + 1 > |
5232 | data->verdict.chain->level) { | |
20a69341 PM |
5233 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
5234 | return -EMLINK; | |
1ca2e170 | 5235 | data->verdict.chain->level = ctx->chain->level + 1; |
20a69341 PM |
5236 | } |
5237 | } | |
5238 | ||
96518518 PM |
5239 | return 0; |
5240 | default: | |
49499c3e | 5241 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 5242 | return -EINVAL; |
45d9bcda PM |
5243 | if (len == 0) |
5244 | return -EINVAL; | |
49499c3e PM |
5245 | if (reg * NFT_REG32_SIZE + len > |
5246 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 5247 | return -ERANGE; |
27e6d201 | 5248 | |
96518518 PM |
5249 | if (data != NULL && type != NFT_DATA_VALUE) |
5250 | return -EINVAL; | |
5251 | return 0; | |
5252 | } | |
5253 | } | |
1ec10212 | 5254 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
5255 | |
5256 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
5257 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
5258 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
5259 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
5260 | }; | |
5261 | ||
5262 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
5263 | struct nft_data_desc *desc, const struct nlattr *nla) | |
5264 | { | |
664b0f8c | 5265 | u8 genmask = nft_genmask_next(ctx->net); |
96518518 PM |
5266 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
5267 | struct nft_chain *chain; | |
5268 | int err; | |
5269 | ||
5270 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); | |
5271 | if (err < 0) | |
5272 | return err; | |
5273 | ||
5274 | if (!tb[NFTA_VERDICT_CODE]) | |
5275 | return -EINVAL; | |
1ca2e170 | 5276 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 5277 | |
1ca2e170 | 5278 | switch (data->verdict.code) { |
e0abdadc | 5279 | default: |
1ca2e170 | 5280 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
5281 | case NF_ACCEPT: |
5282 | case NF_DROP: | |
5283 | case NF_QUEUE: | |
5284 | break; | |
5285 | default: | |
5286 | return -EINVAL; | |
5287 | } | |
5288 | /* fall through */ | |
96518518 PM |
5289 | case NFT_CONTINUE: |
5290 | case NFT_BREAK: | |
5291 | case NFT_RETURN: | |
96518518 PM |
5292 | break; |
5293 | case NFT_JUMP: | |
5294 | case NFT_GOTO: | |
5295 | if (!tb[NFTA_VERDICT_CHAIN]) | |
5296 | return -EINVAL; | |
5297 | chain = nf_tables_chain_lookup(ctx->table, | |
664b0f8c | 5298 | tb[NFTA_VERDICT_CHAIN], genmask); |
96518518 PM |
5299 | if (IS_ERR(chain)) |
5300 | return PTR_ERR(chain); | |
5301 | if (chain->flags & NFT_BASE_CHAIN) | |
5302 | return -EOPNOTSUPP; | |
5303 | ||
96518518 | 5304 | chain->use++; |
1ca2e170 | 5305 | data->verdict.chain = chain; |
96518518 | 5306 | break; |
96518518 PM |
5307 | } |
5308 | ||
4c4ed074 | 5309 | desc->len = sizeof(data->verdict); |
96518518 PM |
5310 | desc->type = NFT_DATA_VERDICT; |
5311 | return 0; | |
5312 | } | |
5313 | ||
5314 | static void nft_verdict_uninit(const struct nft_data *data) | |
5315 | { | |
1ca2e170 | 5316 | switch (data->verdict.code) { |
96518518 PM |
5317 | case NFT_JUMP: |
5318 | case NFT_GOTO: | |
1ca2e170 | 5319 | data->verdict.chain->use--; |
96518518 PM |
5320 | break; |
5321 | } | |
5322 | } | |
5323 | ||
33d5a7b1 | 5324 | int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) |
96518518 PM |
5325 | { |
5326 | struct nlattr *nest; | |
5327 | ||
33d5a7b1 | 5328 | nest = nla_nest_start(skb, type); |
96518518 PM |
5329 | if (!nest) |
5330 | goto nla_put_failure; | |
5331 | ||
33d5a7b1 | 5332 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) |
96518518 PM |
5333 | goto nla_put_failure; |
5334 | ||
33d5a7b1 | 5335 | switch (v->code) { |
96518518 PM |
5336 | case NFT_JUMP: |
5337 | case NFT_GOTO: | |
1ca2e170 | 5338 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
33d5a7b1 | 5339 | v->chain->name)) |
96518518 PM |
5340 | goto nla_put_failure; |
5341 | } | |
5342 | nla_nest_end(skb, nest); | |
5343 | return 0; | |
5344 | ||
5345 | nla_put_failure: | |
5346 | return -1; | |
5347 | } | |
5348 | ||
d0a11fc3 PM |
5349 | static int nft_value_init(const struct nft_ctx *ctx, |
5350 | struct nft_data *data, unsigned int size, | |
96518518 PM |
5351 | struct nft_data_desc *desc, const struct nlattr *nla) |
5352 | { | |
5353 | unsigned int len; | |
5354 | ||
5355 | len = nla_len(nla); | |
5356 | if (len == 0) | |
5357 | return -EINVAL; | |
d0a11fc3 | 5358 | if (len > size) |
96518518 PM |
5359 | return -EOVERFLOW; |
5360 | ||
d0a11fc3 | 5361 | nla_memcpy(data->data, nla, len); |
96518518 PM |
5362 | desc->type = NFT_DATA_VALUE; |
5363 | desc->len = len; | |
5364 | return 0; | |
5365 | } | |
5366 | ||
5367 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
5368 | unsigned int len) | |
5369 | { | |
5370 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
5371 | } | |
5372 | ||
5373 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 5374 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
5375 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
5376 | }; | |
5377 | ||
5378 | /** | |
5379 | * nft_data_init - parse nf_tables data netlink attributes | |
5380 | * | |
5381 | * @ctx: context of the expression using the data | |
5382 | * @data: destination struct nft_data | |
d0a11fc3 | 5383 | * @size: maximum data length |
96518518 PM |
5384 | * @desc: data description |
5385 | * @nla: netlink attribute containing data | |
5386 | * | |
5387 | * Parse the netlink data attributes and initialize a struct nft_data. | |
5388 | * The type and length of data are returned in the data description. | |
5389 | * | |
5390 | * The caller can indicate that it only wants to accept data of type | |
5391 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
5392 | */ | |
d0a11fc3 PM |
5393 | int nft_data_init(const struct nft_ctx *ctx, |
5394 | struct nft_data *data, unsigned int size, | |
96518518 PM |
5395 | struct nft_data_desc *desc, const struct nlattr *nla) |
5396 | { | |
5397 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
5398 | int err; | |
5399 | ||
5400 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); | |
5401 | if (err < 0) | |
5402 | return err; | |
5403 | ||
5404 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
5405 | return nft_value_init(ctx, data, size, desc, |
5406 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
5407 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
5408 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
5409 | return -EINVAL; | |
5410 | } | |
5411 | EXPORT_SYMBOL_GPL(nft_data_init); | |
5412 | ||
5413 | /** | |
5414 | * nft_data_uninit - release a nft_data item | |
5415 | * | |
5416 | * @data: struct nft_data to release | |
5417 | * @type: type of data | |
5418 | * | |
5419 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
5420 | * all others need to be released by calling this function. | |
5421 | */ | |
5422 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) | |
5423 | { | |
960bd2c2 | 5424 | if (type < NFT_DATA_VERDICT) |
96518518 | 5425 | return; |
960bd2c2 | 5426 | switch (type) { |
96518518 PM |
5427 | case NFT_DATA_VERDICT: |
5428 | return nft_verdict_uninit(data); | |
5429 | default: | |
5430 | WARN_ON(1); | |
5431 | } | |
5432 | } | |
5433 | EXPORT_SYMBOL_GPL(nft_data_uninit); | |
5434 | ||
5435 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
5436 | enum nft_data_types type, unsigned int len) | |
5437 | { | |
5438 | struct nlattr *nest; | |
5439 | int err; | |
5440 | ||
5441 | nest = nla_nest_start(skb, attr); | |
5442 | if (nest == NULL) | |
5443 | return -1; | |
5444 | ||
5445 | switch (type) { | |
5446 | case NFT_DATA_VALUE: | |
5447 | err = nft_value_dump(skb, data, len); | |
5448 | break; | |
5449 | case NFT_DATA_VERDICT: | |
33d5a7b1 | 5450 | err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); |
96518518 PM |
5451 | break; |
5452 | default: | |
5453 | err = -EINVAL; | |
5454 | WARN_ON(1); | |
5455 | } | |
5456 | ||
5457 | nla_nest_end(skb, nest); | |
5458 | return err; | |
5459 | } | |
5460 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
5461 | ||
df05ef87 | 5462 | static int __net_init nf_tables_init_net(struct net *net) |
99633ab2 PNA |
5463 | { |
5464 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 5465 | INIT_LIST_HEAD(&net->nft.commit_list); |
38e029f1 | 5466 | net->nft.base_seq = 1; |
99633ab2 PNA |
5467 | return 0; |
5468 | } | |
5469 | ||
5ebe0b0e PNA |
5470 | int __nft_release_basechain(struct nft_ctx *ctx) |
5471 | { | |
5472 | struct nft_rule *rule, *nr; | |
5473 | ||
5474 | BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN)); | |
5475 | ||
82bec71d | 5476 | nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain, |
5ebe0b0e PNA |
5477 | ctx->afi->nops); |
5478 | list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { | |
5479 | list_del(&rule->list); | |
5480 | ctx->chain->use--; | |
5481 | nf_tables_rule_destroy(ctx, rule); | |
5482 | } | |
5483 | list_del(&ctx->chain->list); | |
5484 | ctx->table->use--; | |
5485 | nf_tables_chain_destroy(ctx->chain); | |
5486 | ||
5487 | return 0; | |
5488 | } | |
5489 | EXPORT_SYMBOL_GPL(__nft_release_basechain); | |
5490 | ||
df05ef87 PNA |
5491 | /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */ |
5492 | static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi) | |
5493 | { | |
5494 | struct nft_table *table, *nt; | |
5495 | struct nft_chain *chain, *nc; | |
e5009240 | 5496 | struct nft_object *obj, *ne; |
df05ef87 PNA |
5497 | struct nft_rule *rule, *nr; |
5498 | struct nft_set *set, *ns; | |
5499 | struct nft_ctx ctx = { | |
5500 | .net = net, | |
5501 | .afi = afi, | |
5502 | }; | |
5503 | ||
5504 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
5505 | list_for_each_entry(chain, &table->chains, list) | |
82bec71d PNA |
5506 | nf_tables_unregister_hooks(net, table, chain, |
5507 | afi->nops); | |
df05ef87 PNA |
5508 | /* No packets are walking on these chains anymore. */ |
5509 | ctx.table = table; | |
5510 | list_for_each_entry(chain, &table->chains, list) { | |
5511 | ctx.chain = chain; | |
5512 | list_for_each_entry_safe(rule, nr, &chain->rules, list) { | |
5513 | list_del(&rule->list); | |
5514 | chain->use--; | |
5515 | nf_tables_rule_destroy(&ctx, rule); | |
5516 | } | |
5517 | } | |
5518 | list_for_each_entry_safe(set, ns, &table->sets, list) { | |
5519 | list_del(&set->list); | |
5520 | table->use--; | |
5521 | nft_set_destroy(set); | |
5522 | } | |
e5009240 PNA |
5523 | list_for_each_entry_safe(obj, ne, &table->objects, list) { |
5524 | list_del(&obj->list); | |
5525 | table->use--; | |
5526 | nft_obj_destroy(obj); | |
5527 | } | |
df05ef87 PNA |
5528 | list_for_each_entry_safe(chain, nc, &table->chains, list) { |
5529 | list_del(&chain->list); | |
5530 | table->use--; | |
5531 | nf_tables_chain_destroy(chain); | |
5532 | } | |
5533 | list_del(&table->list); | |
5534 | nf_tables_table_destroy(&ctx); | |
5535 | } | |
5536 | } | |
5537 | ||
99633ab2 PNA |
5538 | static struct pernet_operations nf_tables_net_ops = { |
5539 | .init = nf_tables_init_net, | |
5540 | }; | |
5541 | ||
96518518 PM |
5542 | static int __init nf_tables_module_init(void) |
5543 | { | |
5544 | int err; | |
5545 | ||
5546 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
5547 | GFP_KERNEL); | |
5548 | if (info == NULL) { | |
5549 | err = -ENOMEM; | |
5550 | goto err1; | |
5551 | } | |
5552 | ||
5553 | err = nf_tables_core_module_init(); | |
5554 | if (err < 0) | |
5555 | goto err2; | |
5556 | ||
5557 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
5558 | if (err < 0) | |
5559 | goto err3; | |
5560 | ||
5561 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 5562 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
5563 | err3: |
5564 | nf_tables_core_module_exit(); | |
5565 | err2: | |
5566 | kfree(info); | |
5567 | err1: | |
5568 | return err; | |
5569 | } | |
5570 | ||
5571 | static void __exit nf_tables_module_exit(void) | |
5572 | { | |
99633ab2 | 5573 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 | 5574 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
1b1bc49c | 5575 | rcu_barrier(); |
96518518 PM |
5576 | nf_tables_core_module_exit(); |
5577 | kfree(info); | |
5578 | } | |
5579 | ||
5580 | module_init(nf_tables_module_init); | |
5581 | module_exit(nf_tables_module_exit); | |
5582 | ||
5583 | MODULE_LICENSE("GPL"); | |
5584 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
5585 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |