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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> | |
1ff75a3e | 16 | #include <linux/vmalloc.h> |
96518518 PM |
17 | #include <linux/netfilter.h> |
18 | #include <linux/netfilter/nfnetlink.h> | |
19 | #include <linux/netfilter/nf_tables.h> | |
20 | #include <net/netfilter/nf_tables_core.h> | |
21 | #include <net/netfilter/nf_tables.h> | |
99633ab2 | 22 | #include <net/net_namespace.h> |
96518518 PM |
23 | #include <net/sock.h> |
24 | ||
96518518 | 25 | static LIST_HEAD(nf_tables_expressions); |
e5009240 | 26 | static LIST_HEAD(nf_tables_objects); |
96518518 PM |
27 | |
28 | /** | |
29 | * nft_register_afinfo - register nf_tables address family info | |
30 | * | |
31 | * @afi: address family info to register | |
32 | * | |
33 | * Register the address family for use with nf_tables. Returns zero on | |
34 | * success or a negative errno code otherwise. | |
35 | */ | |
99633ab2 | 36 | int nft_register_afinfo(struct net *net, struct nft_af_info *afi) |
96518518 PM |
37 | { |
38 | INIT_LIST_HEAD(&afi->tables); | |
39 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 40 | list_add_tail_rcu(&afi->list, &net->nft.af_info); |
96518518 PM |
41 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
42 | return 0; | |
43 | } | |
44 | EXPORT_SYMBOL_GPL(nft_register_afinfo); | |
45 | ||
df05ef87 PNA |
46 | static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi); |
47 | ||
96518518 PM |
48 | /** |
49 | * nft_unregister_afinfo - unregister nf_tables address family info | |
50 | * | |
51 | * @afi: address family info to unregister | |
52 | * | |
53 | * Unregister the address family for use with nf_tables. | |
54 | */ | |
df05ef87 | 55 | void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi) |
96518518 PM |
56 | { |
57 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
df05ef87 | 58 | __nft_release_afinfo(net, afi); |
e688a7f8 | 59 | list_del_rcu(&afi->list); |
96518518 PM |
60 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
61 | } | |
62 | EXPORT_SYMBOL_GPL(nft_unregister_afinfo); | |
63 | ||
99633ab2 | 64 | static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family) |
96518518 PM |
65 | { |
66 | struct nft_af_info *afi; | |
67 | ||
99633ab2 | 68 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
69 | if (afi->family == family) |
70 | return afi; | |
71 | } | |
72 | return NULL; | |
73 | } | |
74 | ||
99633ab2 PNA |
75 | static struct nft_af_info * |
76 | nf_tables_afinfo_lookup(struct net *net, int family, bool autoload) | |
96518518 PM |
77 | { |
78 | struct nft_af_info *afi; | |
79 | ||
99633ab2 | 80 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
81 | if (afi != NULL) |
82 | return afi; | |
83 | #ifdef CONFIG_MODULES | |
84 | if (autoload) { | |
85 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
86 | request_module("nft-afinfo-%u", family); | |
87 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
99633ab2 | 88 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
89 | if (afi != NULL) |
90 | return ERR_PTR(-EAGAIN); | |
91 | } | |
92 | #endif | |
93 | return ERR_PTR(-EAFNOSUPPORT); | |
94 | } | |
95 | ||
7c95f6d8 | 96 | static void nft_ctx_init(struct nft_ctx *ctx, |
633c9a84 | 97 | struct net *net, |
7c95f6d8 PNA |
98 | const struct sk_buff *skb, |
99 | const struct nlmsghdr *nlh, | |
100 | struct nft_af_info *afi, | |
101 | struct nft_table *table, | |
102 | struct nft_chain *chain, | |
103 | const struct nlattr * const *nla) | |
104 | { | |
633c9a84 | 105 | ctx->net = net; |
128ad332 PNA |
106 | ctx->afi = afi; |
107 | ctx->table = table; | |
108 | ctx->chain = chain; | |
109 | ctx->nla = nla; | |
110 | ctx->portid = NETLINK_CB(skb).portid; | |
111 | ctx->report = nlmsg_report(nlh); | |
112 | ctx->seq = nlh->nlmsg_seq; | |
7c95f6d8 PNA |
113 | } |
114 | ||
8411b644 PNA |
115 | static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx, |
116 | int msg_type, u32 size, gfp_t gfp) | |
1081d11b PNA |
117 | { |
118 | struct nft_trans *trans; | |
119 | ||
8411b644 | 120 | trans = kzalloc(sizeof(struct nft_trans) + size, gfp); |
1081d11b PNA |
121 | if (trans == NULL) |
122 | return NULL; | |
123 | ||
b380e5c7 | 124 | trans->msg_type = msg_type; |
1081d11b PNA |
125 | trans->ctx = *ctx; |
126 | ||
127 | return trans; | |
128 | } | |
129 | ||
8411b644 PNA |
130 | static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx, |
131 | int msg_type, u32 size) | |
132 | { | |
133 | return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL); | |
134 | } | |
135 | ||
1081d11b PNA |
136 | static void nft_trans_destroy(struct nft_trans *trans) |
137 | { | |
138 | list_del(&trans->list); | |
139 | kfree(trans); | |
140 | } | |
141 | ||
82bec71d PNA |
142 | static int nf_tables_register_hooks(struct net *net, |
143 | const struct nft_table *table, | |
d8ee8f7c PNA |
144 | struct nft_chain *chain, |
145 | unsigned int hook_nops) | |
146 | { | |
147 | if (table->flags & NFT_TABLE_F_DORMANT || | |
f323d954 | 148 | !nft_is_base_chain(chain)) |
d8ee8f7c PNA |
149 | return 0; |
150 | ||
82bec71d PNA |
151 | return nf_register_net_hooks(net, nft_base_chain(chain)->ops, |
152 | hook_nops); | |
d8ee8f7c PNA |
153 | } |
154 | ||
82bec71d PNA |
155 | static void nf_tables_unregister_hooks(struct net *net, |
156 | const struct nft_table *table, | |
d8ee8f7c | 157 | struct nft_chain *chain, |
c5598794 AB |
158 | unsigned int hook_nops) |
159 | { | |
d8ee8f7c | 160 | if (table->flags & NFT_TABLE_F_DORMANT || |
f323d954 | 161 | !nft_is_base_chain(chain)) |
d8ee8f7c PNA |
162 | return; |
163 | ||
82bec71d | 164 | nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops); |
c5598794 AB |
165 | } |
166 | ||
ee01d542 AB |
167 | static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) |
168 | { | |
169 | struct nft_trans *trans; | |
170 | ||
171 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); | |
172 | if (trans == NULL) | |
173 | return -ENOMEM; | |
174 | ||
175 | if (msg_type == NFT_MSG_NEWTABLE) | |
f2a6d766 | 176 | nft_activate_next(ctx->net, ctx->table); |
ee01d542 AB |
177 | |
178 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static int nft_deltable(struct nft_ctx *ctx) | |
183 | { | |
184 | int err; | |
185 | ||
186 | err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); | |
187 | if (err < 0) | |
188 | return err; | |
189 | ||
f2a6d766 | 190 | nft_deactivate_next(ctx->net, ctx->table); |
ee01d542 AB |
191 | return err; |
192 | } | |
193 | ||
194 | static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) | |
195 | { | |
196 | struct nft_trans *trans; | |
197 | ||
198 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); | |
199 | if (trans == NULL) | |
200 | return -ENOMEM; | |
201 | ||
202 | if (msg_type == NFT_MSG_NEWCHAIN) | |
664b0f8c | 203 | nft_activate_next(ctx->net, ctx->chain); |
ee01d542 AB |
204 | |
205 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static int nft_delchain(struct nft_ctx *ctx) | |
210 | { | |
211 | int err; | |
212 | ||
213 | err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); | |
214 | if (err < 0) | |
215 | return err; | |
216 | ||
217 | ctx->table->use--; | |
664b0f8c | 218 | nft_deactivate_next(ctx->net, ctx->chain); |
ee01d542 AB |
219 | |
220 | return err; | |
221 | } | |
222 | ||
ee01d542 AB |
223 | static int |
224 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) | |
225 | { | |
226 | /* You cannot delete the same rule twice */ | |
889f7ee7 PNA |
227 | if (nft_is_active_next(ctx->net, rule)) { |
228 | nft_deactivate_next(ctx->net, rule); | |
ee01d542 AB |
229 | ctx->chain->use--; |
230 | return 0; | |
231 | } | |
232 | return -ENOENT; | |
233 | } | |
234 | ||
235 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, | |
236 | struct nft_rule *rule) | |
237 | { | |
238 | struct nft_trans *trans; | |
239 | ||
240 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); | |
241 | if (trans == NULL) | |
242 | return NULL; | |
243 | ||
1a94e38d PNA |
244 | if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) { |
245 | nft_trans_rule_id(trans) = | |
246 | ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID])); | |
247 | } | |
ee01d542 AB |
248 | nft_trans_rule(trans) = rule; |
249 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
250 | ||
251 | return trans; | |
252 | } | |
253 | ||
254 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) | |
255 | { | |
256 | struct nft_trans *trans; | |
257 | int err; | |
258 | ||
259 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); | |
260 | if (trans == NULL) | |
261 | return -ENOMEM; | |
262 | ||
263 | err = nf_tables_delrule_deactivate(ctx, rule); | |
264 | if (err < 0) { | |
265 | nft_trans_destroy(trans); | |
266 | return err; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static int nft_delrule_by_chain(struct nft_ctx *ctx) | |
273 | { | |
274 | struct nft_rule *rule; | |
275 | int err; | |
276 | ||
277 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
278 | err = nft_delrule(ctx, rule); | |
279 | if (err < 0) | |
280 | return err; | |
281 | } | |
282 | return 0; | |
283 | } | |
284 | ||
ee01d542 AB |
285 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, |
286 | struct nft_set *set) | |
287 | { | |
288 | struct nft_trans *trans; | |
289 | ||
290 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); | |
291 | if (trans == NULL) | |
292 | return -ENOMEM; | |
293 | ||
294 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { | |
295 | nft_trans_set_id(trans) = | |
296 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); | |
37a9cc52 | 297 | nft_activate_next(ctx->net, set); |
ee01d542 AB |
298 | } |
299 | nft_trans_set(trans) = set; | |
300 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static int nft_delset(struct nft_ctx *ctx, struct nft_set *set) | |
306 | { | |
307 | int err; | |
308 | ||
309 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); | |
310 | if (err < 0) | |
311 | return err; | |
312 | ||
37a9cc52 | 313 | nft_deactivate_next(ctx->net, set); |
ee01d542 AB |
314 | ctx->table->use--; |
315 | ||
316 | return err; | |
317 | } | |
318 | ||
e5009240 PNA |
319 | static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type, |
320 | struct nft_object *obj) | |
321 | { | |
322 | struct nft_trans *trans; | |
323 | ||
324 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj)); | |
325 | if (trans == NULL) | |
326 | return -ENOMEM; | |
327 | ||
328 | if (msg_type == NFT_MSG_NEWOBJ) | |
329 | nft_activate_next(ctx->net, obj); | |
330 | ||
331 | nft_trans_obj(trans) = obj; | |
332 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj) | |
338 | { | |
339 | int err; | |
340 | ||
341 | err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj); | |
342 | if (err < 0) | |
343 | return err; | |
344 | ||
345 | nft_deactivate_next(ctx->net, obj); | |
346 | ctx->table->use--; | |
347 | ||
348 | return err; | |
349 | } | |
350 | ||
96518518 PM |
351 | /* |
352 | * Tables | |
353 | */ | |
354 | ||
355 | static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, | |
f2a6d766 PNA |
356 | const struct nlattr *nla, |
357 | u8 genmask) | |
96518518 PM |
358 | { |
359 | struct nft_table *table; | |
360 | ||
361 | list_for_each_entry(table, &afi->tables, list) { | |
f2a6d766 PNA |
362 | if (!nla_strcmp(nla, table->name) && |
363 | nft_active_genmask(table, genmask)) | |
96518518 PM |
364 | return table; |
365 | } | |
366 | return NULL; | |
367 | } | |
368 | ||
369 | static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, | |
f2a6d766 PNA |
370 | const struct nlattr *nla, |
371 | u8 genmask) | |
96518518 PM |
372 | { |
373 | struct nft_table *table; | |
374 | ||
375 | if (nla == NULL) | |
376 | return ERR_PTR(-EINVAL); | |
377 | ||
f2a6d766 | 378 | table = nft_table_lookup(afi, nla, genmask); |
96518518 PM |
379 | if (table != NULL) |
380 | return table; | |
381 | ||
96518518 PM |
382 | return ERR_PTR(-ENOENT); |
383 | } | |
384 | ||
385 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) | |
386 | { | |
387 | return ++table->hgenerator; | |
388 | } | |
389 | ||
d8297d4f | 390 | static const struct nf_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX]; |
9370761c | 391 | |
2a37d755 | 392 | static const struct nf_chain_type * |
baae3e62 | 393 | __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
9370761c PNA |
394 | { |
395 | int i; | |
396 | ||
baae3e62 | 397 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
398 | if (chain_type[family][i] != NULL && |
399 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 400 | return chain_type[family][i]; |
9370761c | 401 | } |
baae3e62 | 402 | return NULL; |
9370761c PNA |
403 | } |
404 | ||
2a37d755 | 405 | static const struct nf_chain_type * |
baae3e62 PM |
406 | nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
407 | const struct nlattr *nla, | |
408 | bool autoload) | |
9370761c | 409 | { |
2a37d755 | 410 | const struct nf_chain_type *type; |
9370761c PNA |
411 | |
412 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
413 | if (type != NULL) |
414 | return type; | |
9370761c | 415 | #ifdef CONFIG_MODULES |
93b0806f | 416 | if (autoload) { |
9370761c | 417 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2fec6bb6 PNA |
418 | request_module("nft-chain-%u-%.*s", afi->family, |
419 | nla_len(nla), (const char *)nla_data(nla)); | |
9370761c PNA |
420 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
421 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
422 | if (type != NULL) |
423 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
424 | } |
425 | #endif | |
93b0806f | 426 | return ERR_PTR(-ENOENT); |
9370761c PNA |
427 | } |
428 | ||
96518518 | 429 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
1cae565e PNA |
430 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
431 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
9ddf6323 | 432 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
433 | }; |
434 | ||
84d7fce6 PNA |
435 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
436 | u32 portid, u32 seq, int event, u32 flags, | |
437 | int family, const struct nft_table *table) | |
96518518 PM |
438 | { |
439 | struct nlmsghdr *nlh; | |
440 | struct nfgenmsg *nfmsg; | |
441 | ||
dedb67c4 | 442 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
443 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
444 | if (nlh == NULL) | |
445 | goto nla_put_failure; | |
446 | ||
447 | nfmsg = nlmsg_data(nlh); | |
448 | nfmsg->nfgen_family = family; | |
449 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 450 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 | 451 | |
9ddf6323 | 452 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 TB |
453 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
454 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) | |
96518518 PM |
455 | goto nla_put_failure; |
456 | ||
053c095a JB |
457 | nlmsg_end(skb, nlh); |
458 | return 0; | |
96518518 PM |
459 | |
460 | nla_put_failure: | |
461 | nlmsg_trim(skb, nlh); | |
462 | return -1; | |
463 | } | |
464 | ||
25e94a99 | 465 | static void nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
466 | { |
467 | struct sk_buff *skb; | |
96518518 PM |
468 | int err; |
469 | ||
128ad332 PNA |
470 | if (!ctx->report && |
471 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 472 | return; |
96518518 | 473 | |
96518518 PM |
474 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
475 | if (skb == NULL) | |
476 | goto err; | |
477 | ||
84d7fce6 PNA |
478 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
479 | event, 0, ctx->afi->family, ctx->table); | |
96518518 PM |
480 | if (err < 0) { |
481 | kfree_skb(skb); | |
482 | goto err; | |
483 | } | |
484 | ||
25e94a99 PNA |
485 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
486 | ctx->report, GFP_KERNEL); | |
487 | return; | |
96518518 | 488 | err: |
25e94a99 | 489 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
490 | } |
491 | ||
492 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
493 | struct netlink_callback *cb) | |
494 | { | |
495 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
496 | const struct nft_af_info *afi; | |
497 | const struct nft_table *table; | |
498 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 499 | struct net *net = sock_net(skb->sk); |
96518518 PM |
500 | int family = nfmsg->nfgen_family; |
501 | ||
e688a7f8 | 502 | rcu_read_lock(); |
38e029f1 PNA |
503 | cb->seq = net->nft.base_seq; |
504 | ||
e688a7f8 | 505 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
506 | if (family != NFPROTO_UNSPEC && family != afi->family) |
507 | continue; | |
508 | ||
e688a7f8 | 509 | list_for_each_entry_rcu(table, &afi->tables, list) { |
96518518 PM |
510 | if (idx < s_idx) |
511 | goto cont; | |
512 | if (idx > s_idx) | |
513 | memset(&cb->args[1], 0, | |
514 | sizeof(cb->args) - sizeof(cb->args[0])); | |
f2a6d766 PNA |
515 | if (!nft_is_active(net, table)) |
516 | continue; | |
84d7fce6 | 517 | if (nf_tables_fill_table_info(skb, net, |
96518518 PM |
518 | NETLINK_CB(cb->skb).portid, |
519 | cb->nlh->nlmsg_seq, | |
520 | NFT_MSG_NEWTABLE, | |
521 | NLM_F_MULTI, | |
522 | afi->family, table) < 0) | |
523 | goto done; | |
38e029f1 PNA |
524 | |
525 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
526 | cont: |
527 | idx++; | |
528 | } | |
529 | } | |
530 | done: | |
e688a7f8 | 531 | rcu_read_unlock(); |
96518518 PM |
532 | cb->args[0] = idx; |
533 | return skb->len; | |
534 | } | |
535 | ||
7b8002a1 PNA |
536 | static int nf_tables_gettable(struct net *net, struct sock *nlsk, |
537 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
538 | const struct nlattr * const nla[], |
539 | struct netlink_ext_ack *extack) | |
96518518 PM |
540 | { |
541 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 542 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
543 | const struct nft_af_info *afi; |
544 | const struct nft_table *table; | |
545 | struct sk_buff *skb2; | |
546 | int family = nfmsg->nfgen_family; | |
547 | int err; | |
548 | ||
549 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
550 | struct netlink_dump_control c = { | |
551 | .dump = nf_tables_dump_tables, | |
552 | }; | |
553 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
554 | } | |
555 | ||
99633ab2 | 556 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
557 | if (IS_ERR(afi)) |
558 | return PTR_ERR(afi); | |
559 | ||
f2a6d766 | 560 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
561 | if (IS_ERR(table)) |
562 | return PTR_ERR(table); | |
563 | ||
564 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
565 | if (!skb2) | |
566 | return -ENOMEM; | |
567 | ||
84d7fce6 | 568 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
569 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
570 | family, table); | |
571 | if (err < 0) | |
572 | goto err; | |
573 | ||
574 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
575 | ||
576 | err: | |
577 | kfree_skb(skb2); | |
578 | return err; | |
579 | } | |
580 | ||
10435c11 F |
581 | static void _nf_tables_table_disable(struct net *net, |
582 | const struct nft_af_info *afi, | |
583 | struct nft_table *table, | |
584 | u32 cnt) | |
585 | { | |
586 | struct nft_chain *chain; | |
587 | u32 i = 0; | |
588 | ||
589 | list_for_each_entry(chain, &table->chains, list) { | |
590 | if (!nft_is_active_next(net, chain)) | |
591 | continue; | |
f323d954 | 592 | if (!nft_is_base_chain(chain)) |
10435c11 F |
593 | continue; |
594 | ||
595 | if (cnt && i++ == cnt) | |
596 | break; | |
597 | ||
598 | nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, | |
599 | afi->nops); | |
600 | } | |
601 | } | |
602 | ||
664b0f8c PNA |
603 | static int nf_tables_table_enable(struct net *net, |
604 | const struct nft_af_info *afi, | |
115a60b1 | 605 | struct nft_table *table) |
9ddf6323 PNA |
606 | { |
607 | struct nft_chain *chain; | |
608 | int err, i = 0; | |
609 | ||
610 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
611 | if (!nft_is_active_next(net, chain)) |
612 | continue; | |
f323d954 | 613 | if (!nft_is_base_chain(chain)) |
d2012975 PNA |
614 | continue; |
615 | ||
82bec71d PNA |
616 | err = nf_register_net_hooks(net, nft_base_chain(chain)->ops, |
617 | afi->nops); | |
9ddf6323 PNA |
618 | if (err < 0) |
619 | goto err; | |
620 | ||
621 | i++; | |
622 | } | |
623 | return 0; | |
624 | err: | |
10435c11 F |
625 | if (i) |
626 | _nf_tables_table_disable(net, afi, table, i); | |
9ddf6323 PNA |
627 | return err; |
628 | } | |
629 | ||
664b0f8c PNA |
630 | static void nf_tables_table_disable(struct net *net, |
631 | const struct nft_af_info *afi, | |
d8ee8f7c | 632 | struct nft_table *table) |
9ddf6323 | 633 | { |
10435c11 | 634 | _nf_tables_table_disable(net, afi, table, 0); |
9ddf6323 PNA |
635 | } |
636 | ||
e1aaca93 | 637 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 638 | { |
55dd6f93 | 639 | struct nft_trans *trans; |
e1aaca93 | 640 | u32 flags; |
55dd6f93 | 641 | int ret = 0; |
9ddf6323 | 642 | |
e1aaca93 PNA |
643 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
644 | return 0; | |
9ddf6323 | 645 | |
e1aaca93 PNA |
646 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
647 | if (flags & ~NFT_TABLE_F_DORMANT) | |
648 | return -EINVAL; | |
649 | ||
63283dd2 PNA |
650 | if (flags == ctx->table->flags) |
651 | return 0; | |
652 | ||
55dd6f93 PNA |
653 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
654 | sizeof(struct nft_trans_table)); | |
655 | if (trans == NULL) | |
656 | return -ENOMEM; | |
9ddf6323 | 657 | |
e1aaca93 PNA |
658 | if ((flags & NFT_TABLE_F_DORMANT) && |
659 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 660 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
661 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
662 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
664b0f8c | 663 | ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table); |
55dd6f93 | 664 | if (ret >= 0) { |
e1aaca93 | 665 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 666 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 667 | } |
9ddf6323 | 668 | } |
e1aaca93 PNA |
669 | if (ret < 0) |
670 | goto err; | |
9ddf6323 | 671 | |
55dd6f93 PNA |
672 | nft_trans_table_update(trans) = true; |
673 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
674 | return 0; | |
9ddf6323 | 675 | err: |
55dd6f93 | 676 | nft_trans_destroy(trans); |
9ddf6323 PNA |
677 | return ret; |
678 | } | |
679 | ||
633c9a84 PNA |
680 | static int nf_tables_newtable(struct net *net, struct sock *nlsk, |
681 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
682 | const struct nlattr * const nla[], |
683 | struct netlink_ext_ack *extack) | |
96518518 PM |
684 | { |
685 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 686 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
687 | const struct nlattr *name; |
688 | struct nft_af_info *afi; | |
689 | struct nft_table *table; | |
690 | int family = nfmsg->nfgen_family; | |
c5c1f975 | 691 | u32 flags = 0; |
e1aaca93 | 692 | struct nft_ctx ctx; |
55dd6f93 | 693 | int err; |
96518518 | 694 | |
99633ab2 | 695 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
696 | if (IS_ERR(afi)) |
697 | return PTR_ERR(afi); | |
698 | ||
699 | name = nla[NFTA_TABLE_NAME]; | |
f2a6d766 | 700 | table = nf_tables_table_lookup(afi, name, genmask); |
96518518 PM |
701 | if (IS_ERR(table)) { |
702 | if (PTR_ERR(table) != -ENOENT) | |
703 | return PTR_ERR(table); | |
1a28ad74 | 704 | } else { |
96518518 PM |
705 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
706 | return -EEXIST; | |
707 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
708 | return -EOPNOTSUPP; | |
e1aaca93 | 709 | |
633c9a84 | 710 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
e1aaca93 | 711 | return nf_tables_updtable(&ctx); |
96518518 PM |
712 | } |
713 | ||
c5c1f975 PM |
714 | if (nla[NFTA_TABLE_FLAGS]) { |
715 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
716 | if (flags & ~NFT_TABLE_F_DORMANT) | |
717 | return -EINVAL; | |
718 | } | |
719 | ||
ebddf1a8 | 720 | err = -EAFNOSUPPORT; |
7047f9d0 | 721 | if (!try_module_get(afi->owner)) |
ebddf1a8 | 722 | goto err1; |
7047f9d0 | 723 | |
ffdb210e | 724 | err = -ENOMEM; |
1cae565e | 725 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
ffdb210e | 726 | if (table == NULL) |
ebddf1a8 | 727 | goto err2; |
96518518 | 728 | |
e46abbcc PS |
729 | table->name = nla_strdup(name, GFP_KERNEL); |
730 | if (table->name == NULL) | |
731 | goto err3; | |
732 | ||
96518518 | 733 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 734 | INIT_LIST_HEAD(&table->sets); |
e5009240 | 735 | INIT_LIST_HEAD(&table->objects); |
c5c1f975 | 736 | table->flags = flags; |
9ddf6323 | 737 | |
633c9a84 | 738 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
55dd6f93 | 739 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
ffdb210e | 740 | if (err < 0) |
e46abbcc | 741 | goto err4; |
ffdb210e | 742 | |
e688a7f8 | 743 | list_add_tail_rcu(&table->list, &afi->tables); |
96518518 | 744 | return 0; |
e46abbcc PS |
745 | err4: |
746 | kfree(table->name); | |
ebddf1a8 | 747 | err3: |
ffdb210e | 748 | kfree(table); |
ebddf1a8 | 749 | err2: |
ffdb210e | 750 | module_put(afi->owner); |
ebddf1a8 | 751 | err1: |
ffdb210e | 752 | return err; |
96518518 PM |
753 | } |
754 | ||
b9ac12ef AB |
755 | static int nft_flush_table(struct nft_ctx *ctx) |
756 | { | |
757 | int err; | |
758 | struct nft_chain *chain, *nc; | |
e5009240 | 759 | struct nft_object *obj, *ne; |
b9ac12ef AB |
760 | struct nft_set *set, *ns; |
761 | ||
a2f18db0 | 762 | list_for_each_entry(chain, &ctx->table->chains, list) { |
664b0f8c PNA |
763 | if (!nft_is_active_next(ctx->net, chain)) |
764 | continue; | |
765 | ||
b9ac12ef AB |
766 | ctx->chain = chain; |
767 | ||
768 | err = nft_delrule_by_chain(ctx); | |
769 | if (err < 0) | |
770 | goto out; | |
b9ac12ef AB |
771 | } |
772 | ||
773 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
37a9cc52 PNA |
774 | if (!nft_is_active_next(ctx->net, set)) |
775 | continue; | |
776 | ||
b9ac12ef AB |
777 | if (set->flags & NFT_SET_ANONYMOUS && |
778 | !list_empty(&set->bindings)) | |
779 | continue; | |
780 | ||
781 | err = nft_delset(ctx, set); | |
782 | if (err < 0) | |
783 | goto out; | |
784 | } | |
785 | ||
e5009240 PNA |
786 | list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { |
787 | err = nft_delobj(ctx, obj); | |
788 | if (err < 0) | |
789 | goto out; | |
790 | } | |
791 | ||
a2f18db0 | 792 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
664b0f8c PNA |
793 | if (!nft_is_active_next(ctx->net, chain)) |
794 | continue; | |
795 | ||
a2f18db0 PNA |
796 | ctx->chain = chain; |
797 | ||
798 | err = nft_delchain(ctx); | |
799 | if (err < 0) | |
800 | goto out; | |
801 | } | |
802 | ||
b9ac12ef AB |
803 | err = nft_deltable(ctx); |
804 | out: | |
805 | return err; | |
806 | } | |
807 | ||
808 | static int nft_flush(struct nft_ctx *ctx, int family) | |
809 | { | |
810 | struct nft_af_info *afi; | |
811 | struct nft_table *table, *nt; | |
812 | const struct nlattr * const *nla = ctx->nla; | |
813 | int err = 0; | |
814 | ||
815 | list_for_each_entry(afi, &ctx->net->nft.af_info, list) { | |
816 | if (family != AF_UNSPEC && afi->family != family) | |
817 | continue; | |
818 | ||
819 | ctx->afi = afi; | |
820 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
f2a6d766 PNA |
821 | if (!nft_is_active_next(ctx->net, table)) |
822 | continue; | |
823 | ||
b9ac12ef AB |
824 | if (nla[NFTA_TABLE_NAME] && |
825 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
826 | continue; | |
827 | ||
828 | ctx->table = table; | |
829 | ||
830 | err = nft_flush_table(ctx); | |
831 | if (err < 0) | |
832 | goto out; | |
833 | } | |
834 | } | |
835 | out: | |
836 | return err; | |
837 | } | |
838 | ||
633c9a84 PNA |
839 | static int nf_tables_deltable(struct net *net, struct sock *nlsk, |
840 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
841 | const struct nlattr * const nla[], |
842 | struct netlink_ext_ack *extack) | |
96518518 PM |
843 | { |
844 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 845 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
846 | struct nft_af_info *afi; |
847 | struct nft_table *table; | |
ee01d542 | 848 | int family = nfmsg->nfgen_family; |
55dd6f93 | 849 | struct nft_ctx ctx; |
96518518 | 850 | |
633c9a84 | 851 | nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla); |
b9ac12ef AB |
852 | if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL) |
853 | return nft_flush(&ctx, family); | |
854 | ||
99633ab2 | 855 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
856 | if (IS_ERR(afi)) |
857 | return PTR_ERR(afi); | |
858 | ||
f2a6d766 | 859 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
860 | if (IS_ERR(table)) |
861 | return PTR_ERR(table); | |
96518518 | 862 | |
a8278400 PNA |
863 | if (nlh->nlmsg_flags & NLM_F_NONREC && |
864 | table->use > 0) | |
865 | return -EBUSY; | |
866 | ||
b9ac12ef AB |
867 | ctx.afi = afi; |
868 | ctx.table = table; | |
55dd6f93 | 869 | |
b9ac12ef | 870 | return nft_flush_table(&ctx); |
96518518 PM |
871 | } |
872 | ||
55dd6f93 PNA |
873 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
874 | { | |
4fefee57 PNA |
875 | BUG_ON(ctx->table->use > 0); |
876 | ||
e46abbcc | 877 | kfree(ctx->table->name); |
55dd6f93 PNA |
878 | kfree(ctx->table); |
879 | module_put(ctx->afi->owner); | |
880 | } | |
881 | ||
2a37d755 | 882 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 883 | { |
9370761c | 884 | int err = 0; |
96518518 | 885 | |
d8297d4f FW |
886 | if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO)) |
887 | return -EINVAL; | |
888 | ||
96518518 | 889 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c PNA |
890 | if (chain_type[ctype->family][ctype->type] != NULL) { |
891 | err = -EBUSY; | |
892 | goto out; | |
96518518 | 893 | } |
9370761c PNA |
894 | chain_type[ctype->family][ctype->type] = ctype; |
895 | out: | |
96518518 PM |
896 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
897 | return err; | |
898 | } | |
9370761c | 899 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 900 | |
2a37d755 | 901 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 902 | { |
96518518 | 903 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 904 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
905 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
906 | } | |
9370761c | 907 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
908 | |
909 | /* | |
910 | * Chains | |
911 | */ | |
912 | ||
913 | static struct nft_chain * | |
664b0f8c PNA |
914 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle, |
915 | u8 genmask) | |
96518518 PM |
916 | { |
917 | struct nft_chain *chain; | |
918 | ||
919 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
920 | if (chain->handle == handle && |
921 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
922 | return chain; |
923 | } | |
924 | ||
925 | return ERR_PTR(-ENOENT); | |
926 | } | |
927 | ||
928 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
664b0f8c PNA |
929 | const struct nlattr *nla, |
930 | u8 genmask) | |
96518518 PM |
931 | { |
932 | struct nft_chain *chain; | |
933 | ||
934 | if (nla == NULL) | |
935 | return ERR_PTR(-EINVAL); | |
936 | ||
937 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
938 | if (!nla_strcmp(nla, chain->name) && |
939 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
940 | return chain; |
941 | } | |
942 | ||
943 | return ERR_PTR(-ENOENT); | |
944 | } | |
945 | ||
946 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
b2fbd044 LZ |
947 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, |
948 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
949 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
950 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
951 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
952 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 953 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 954 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 955 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
956 | }; |
957 | ||
958 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
959 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
960 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
2cbce139 PNA |
961 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
962 | .len = IFNAMSIZ - 1 }, | |
96518518 PM |
963 | }; |
964 | ||
0ca743a5 PNA |
965 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
966 | { | |
967 | struct nft_stats *cpu_stats, total; | |
968 | struct nlattr *nest; | |
ce355e20 ED |
969 | unsigned int seq; |
970 | u64 pkts, bytes; | |
0ca743a5 PNA |
971 | int cpu; |
972 | ||
973 | memset(&total, 0, sizeof(total)); | |
974 | for_each_possible_cpu(cpu) { | |
975 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
976 | do { |
977 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
978 | pkts = cpu_stats->pkts; | |
979 | bytes = cpu_stats->bytes; | |
980 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
981 | total.pkts += pkts; | |
982 | total.bytes += bytes; | |
0ca743a5 PNA |
983 | } |
984 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
985 | if (nest == NULL) | |
986 | goto nla_put_failure; | |
987 | ||
b46f6ded ND |
988 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), |
989 | NFTA_COUNTER_PAD) || | |
990 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), | |
991 | NFTA_COUNTER_PAD)) | |
0ca743a5 PNA |
992 | goto nla_put_failure; |
993 | ||
994 | nla_nest_end(skb, nest); | |
995 | return 0; | |
996 | ||
997 | nla_put_failure: | |
998 | return -ENOSPC; | |
999 | } | |
1000 | ||
84d7fce6 PNA |
1001 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
1002 | u32 portid, u32 seq, int event, u32 flags, | |
1003 | int family, const struct nft_table *table, | |
96518518 PM |
1004 | const struct nft_chain *chain) |
1005 | { | |
1006 | struct nlmsghdr *nlh; | |
1007 | struct nfgenmsg *nfmsg; | |
1008 | ||
dedb67c4 | 1009 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
1010 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
1011 | if (nlh == NULL) | |
1012 | goto nla_put_failure; | |
1013 | ||
1014 | nfmsg = nlmsg_data(nlh); | |
1015 | nfmsg->nfgen_family = family; | |
1016 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1017 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1018 | |
1019 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
1020 | goto nla_put_failure; | |
b46f6ded ND |
1021 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), |
1022 | NFTA_CHAIN_PAD)) | |
96518518 PM |
1023 | goto nla_put_failure; |
1024 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
1025 | goto nla_put_failure; | |
1026 | ||
f323d954 | 1027 | if (nft_is_base_chain(chain)) { |
0ca743a5 | 1028 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 1029 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
1030 | struct nlattr *nest; |
1031 | ||
1032 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
1033 | if (nest == NULL) |
1034 | goto nla_put_failure; | |
1035 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
1036 | goto nla_put_failure; | |
1037 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
1038 | goto nla_put_failure; | |
2cbce139 PNA |
1039 | if (basechain->dev_name[0] && |
1040 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) | |
1041 | goto nla_put_failure; | |
96518518 | 1042 | nla_nest_end(skb, nest); |
9370761c | 1043 | |
0ca743a5 PNA |
1044 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
1045 | htonl(basechain->policy))) | |
1046 | goto nla_put_failure; | |
1047 | ||
baae3e62 PM |
1048 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
1049 | goto nla_put_failure; | |
0ca743a5 PNA |
1050 | |
1051 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
1052 | goto nla_put_failure; | |
96518518 PM |
1053 | } |
1054 | ||
0ca743a5 PNA |
1055 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
1056 | goto nla_put_failure; | |
1057 | ||
053c095a JB |
1058 | nlmsg_end(skb, nlh); |
1059 | return 0; | |
96518518 PM |
1060 | |
1061 | nla_put_failure: | |
1062 | nlmsg_trim(skb, nlh); | |
1063 | return -1; | |
1064 | } | |
1065 | ||
25e94a99 | 1066 | static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
1067 | { |
1068 | struct sk_buff *skb; | |
96518518 PM |
1069 | int err; |
1070 | ||
128ad332 PNA |
1071 | if (!ctx->report && |
1072 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 1073 | return; |
96518518 | 1074 | |
96518518 PM |
1075 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1076 | if (skb == NULL) | |
1077 | goto err; | |
1078 | ||
84d7fce6 PNA |
1079 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
1080 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1081 | ctx->chain); |
96518518 PM |
1082 | if (err < 0) { |
1083 | kfree_skb(skb); | |
1084 | goto err; | |
1085 | } | |
1086 | ||
25e94a99 PNA |
1087 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1088 | ctx->report, GFP_KERNEL); | |
1089 | return; | |
96518518 | 1090 | err: |
25e94a99 | 1091 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
1092 | } |
1093 | ||
1094 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1095 | struct netlink_callback *cb) | |
1096 | { | |
1097 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1098 | const struct nft_af_info *afi; | |
1099 | const struct nft_table *table; | |
1100 | const struct nft_chain *chain; | |
1101 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1102 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1103 | int family = nfmsg->nfgen_family; |
1104 | ||
e688a7f8 | 1105 | rcu_read_lock(); |
38e029f1 PNA |
1106 | cb->seq = net->nft.base_seq; |
1107 | ||
e688a7f8 | 1108 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1109 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1110 | continue; | |
1111 | ||
e688a7f8 PNA |
1112 | list_for_each_entry_rcu(table, &afi->tables, list) { |
1113 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
96518518 PM |
1114 | if (idx < s_idx) |
1115 | goto cont; | |
1116 | if (idx > s_idx) | |
1117 | memset(&cb->args[1], 0, | |
1118 | sizeof(cb->args) - sizeof(cb->args[0])); | |
664b0f8c PNA |
1119 | if (!nft_is_active(net, chain)) |
1120 | continue; | |
84d7fce6 PNA |
1121 | if (nf_tables_fill_chain_info(skb, net, |
1122 | NETLINK_CB(cb->skb).portid, | |
96518518 PM |
1123 | cb->nlh->nlmsg_seq, |
1124 | NFT_MSG_NEWCHAIN, | |
1125 | NLM_F_MULTI, | |
1126 | afi->family, table, chain) < 0) | |
1127 | goto done; | |
38e029f1 PNA |
1128 | |
1129 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
1130 | cont: |
1131 | idx++; | |
1132 | } | |
1133 | } | |
1134 | } | |
1135 | done: | |
e688a7f8 | 1136 | rcu_read_unlock(); |
96518518 PM |
1137 | cb->args[0] = idx; |
1138 | return skb->len; | |
1139 | } | |
1140 | ||
7b8002a1 PNA |
1141 | static int nf_tables_getchain(struct net *net, struct sock *nlsk, |
1142 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1143 | const struct nlattr * const nla[], |
1144 | struct netlink_ext_ack *extack) | |
96518518 PM |
1145 | { |
1146 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1147 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
1148 | const struct nft_af_info *afi; |
1149 | const struct nft_table *table; | |
1150 | const struct nft_chain *chain; | |
1151 | struct sk_buff *skb2; | |
1152 | int family = nfmsg->nfgen_family; | |
1153 | int err; | |
1154 | ||
1155 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1156 | struct netlink_dump_control c = { | |
1157 | .dump = nf_tables_dump_chains, | |
1158 | }; | |
1159 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1160 | } | |
1161 | ||
99633ab2 | 1162 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1163 | if (IS_ERR(afi)) |
1164 | return PTR_ERR(afi); | |
1165 | ||
f2a6d766 | 1166 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1167 | if (IS_ERR(table)) |
1168 | return PTR_ERR(table); | |
1169 | ||
664b0f8c | 1170 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1171 | if (IS_ERR(chain)) |
1172 | return PTR_ERR(chain); | |
1173 | ||
1174 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1175 | if (!skb2) | |
1176 | return -ENOMEM; | |
1177 | ||
84d7fce6 | 1178 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1179 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1180 | family, table, chain); | |
1181 | if (err < 0) | |
1182 | goto err; | |
1183 | ||
1184 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1185 | ||
1186 | err: | |
1187 | kfree_skb(skb2); | |
1188 | return err; | |
1189 | } | |
1190 | ||
0ca743a5 PNA |
1191 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1192 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1193 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1194 | }; | |
1195 | ||
ff3cd7b3 | 1196 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1197 | { |
1198 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1199 | struct nft_stats __percpu *newstats; | |
1200 | struct nft_stats *stats; | |
1201 | int err; | |
1202 | ||
fceb6435 JB |
1203 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy, |
1204 | NULL); | |
0ca743a5 | 1205 | if (err < 0) |
ff3cd7b3 | 1206 | return ERR_PTR(err); |
0ca743a5 PNA |
1207 | |
1208 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1209 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1210 | |
ce355e20 | 1211 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1212 | if (newstats == NULL) |
ff3cd7b3 | 1213 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1214 | |
1215 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1216 | * are not exposed to userspace. | |
1217 | */ | |
e8781f70 | 1218 | preempt_disable(); |
0ca743a5 PNA |
1219 | stats = this_cpu_ptr(newstats); |
1220 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1221 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1222 | preempt_enable(); |
0ca743a5 | 1223 | |
ff3cd7b3 PNA |
1224 | return newstats; |
1225 | } | |
1226 | ||
1227 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
1228 | struct nft_stats __percpu *newstats) | |
1229 | { | |
b88825de PNA |
1230 | if (newstats == NULL) |
1231 | return; | |
1232 | ||
0ca743a5 | 1233 | if (chain->stats) { |
0ca743a5 | 1234 | struct nft_stats __percpu *oldstats = |
67a8fc27 | 1235 | nft_dereference(chain->stats); |
0ca743a5 PNA |
1236 | |
1237 | rcu_assign_pointer(chain->stats, newstats); | |
1238 | synchronize_rcu(); | |
1239 | free_percpu(oldstats); | |
1240 | } else | |
1241 | rcu_assign_pointer(chain->stats, newstats); | |
0ca743a5 PNA |
1242 | } |
1243 | ||
91c7b38d PNA |
1244 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
1245 | { | |
1246 | BUG_ON(chain->use > 0); | |
1247 | ||
f323d954 | 1248 | if (nft_is_base_chain(chain)) { |
2cbce139 PNA |
1249 | struct nft_base_chain *basechain = nft_base_chain(chain); |
1250 | ||
1251 | module_put(basechain->type->owner); | |
1252 | free_percpu(basechain->stats); | |
9f08ea84 PNA |
1253 | if (basechain->stats) |
1254 | static_branch_dec(&nft_counters_enabled); | |
2cbce139 PNA |
1255 | if (basechain->ops[0].dev != NULL) |
1256 | dev_put(basechain->ops[0].dev); | |
b7263e07 | 1257 | kfree(chain->name); |
2cbce139 | 1258 | kfree(basechain); |
91c7b38d | 1259 | } else { |
b7263e07 | 1260 | kfree(chain->name); |
91c7b38d PNA |
1261 | kfree(chain); |
1262 | } | |
1263 | } | |
1264 | ||
508f8ccd PNA |
1265 | struct nft_chain_hook { |
1266 | u32 num; | |
1267 | u32 priority; | |
1268 | const struct nf_chain_type *type; | |
1269 | struct net_device *dev; | |
1270 | }; | |
1271 | ||
1272 | static int nft_chain_parse_hook(struct net *net, | |
1273 | const struct nlattr * const nla[], | |
1274 | struct nft_af_info *afi, | |
1275 | struct nft_chain_hook *hook, bool create) | |
1276 | { | |
1277 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; | |
1278 | const struct nf_chain_type *type; | |
1279 | struct net_device *dev; | |
1280 | int err; | |
1281 | ||
1282 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
fceb6435 | 1283 | nft_hook_policy, NULL); |
508f8ccd PNA |
1284 | if (err < 0) |
1285 | return err; | |
1286 | ||
1287 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1288 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1289 | return -EINVAL; | |
1290 | ||
1291 | hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
1292 | if (hook->num >= afi->nhooks) | |
1293 | return -EINVAL; | |
1294 | ||
1295 | hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); | |
1296 | ||
1297 | type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT]; | |
1298 | if (nla[NFTA_CHAIN_TYPE]) { | |
1299 | type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE], | |
1300 | create); | |
1301 | if (IS_ERR(type)) | |
1302 | return PTR_ERR(type); | |
1303 | } | |
1304 | if (!(type->hook_mask & (1 << hook->num))) | |
1305 | return -EOPNOTSUPP; | |
1306 | if (!try_module_get(type->owner)) | |
1307 | return -ENOENT; | |
1308 | ||
1309 | hook->type = type; | |
1310 | ||
1311 | hook->dev = NULL; | |
1312 | if (afi->flags & NFT_AF_NEEDS_DEV) { | |
1313 | char ifname[IFNAMSIZ]; | |
1314 | ||
1315 | if (!ha[NFTA_HOOK_DEV]) { | |
1316 | module_put(type->owner); | |
1317 | return -EOPNOTSUPP; | |
1318 | } | |
1319 | ||
1320 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); | |
1321 | dev = dev_get_by_name(net, ifname); | |
1322 | if (!dev) { | |
1323 | module_put(type->owner); | |
1324 | return -ENOENT; | |
1325 | } | |
1326 | hook->dev = dev; | |
1327 | } else if (ha[NFTA_HOOK_DEV]) { | |
1328 | module_put(type->owner); | |
1329 | return -EOPNOTSUPP; | |
1330 | } | |
1331 | ||
1332 | return 0; | |
1333 | } | |
1334 | ||
1335 | static void nft_chain_release_hook(struct nft_chain_hook *hook) | |
1336 | { | |
1337 | module_put(hook->type->owner); | |
1338 | if (hook->dev != NULL) | |
1339 | dev_put(hook->dev); | |
1340 | } | |
1341 | ||
4035285f PNA |
1342 | static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask, |
1343 | u8 policy, bool create) | |
1344 | { | |
1345 | const struct nlattr * const *nla = ctx->nla; | |
1346 | struct nft_table *table = ctx->table; | |
1347 | struct nft_af_info *afi = ctx->afi; | |
1348 | struct nft_base_chain *basechain; | |
1349 | struct nft_stats __percpu *stats; | |
1350 | struct net *net = ctx->net; | |
1351 | struct nft_chain *chain; | |
1352 | unsigned int i; | |
1353 | int err; | |
1354 | ||
1355 | if (table->use == UINT_MAX) | |
1356 | return -EOVERFLOW; | |
1357 | ||
1358 | if (nla[NFTA_CHAIN_HOOK]) { | |
1359 | struct nft_chain_hook hook; | |
1360 | struct nf_hook_ops *ops; | |
1361 | nf_hookfn *hookfn; | |
1362 | ||
1363 | err = nft_chain_parse_hook(net, nla, afi, &hook, create); | |
1364 | if (err < 0) | |
1365 | return err; | |
1366 | ||
1367 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); | |
1368 | if (basechain == NULL) { | |
1369 | nft_chain_release_hook(&hook); | |
1370 | return -ENOMEM; | |
1371 | } | |
1372 | ||
1373 | if (hook.dev != NULL) | |
1374 | strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ); | |
1375 | ||
1376 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1377 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1378 | if (IS_ERR(stats)) { | |
1379 | nft_chain_release_hook(&hook); | |
1380 | kfree(basechain); | |
1381 | return PTR_ERR(stats); | |
1382 | } | |
1383 | basechain->stats = stats; | |
1384 | static_branch_inc(&nft_counters_enabled); | |
1385 | } | |
1386 | ||
1387 | hookfn = hook.type->hooks[hook.num]; | |
1388 | basechain->type = hook.type; | |
1389 | chain = &basechain->chain; | |
1390 | ||
1391 | for (i = 0; i < afi->nops; i++) { | |
1392 | ops = &basechain->ops[i]; | |
1393 | ops->pf = family; | |
1394 | ops->hooknum = hook.num; | |
1395 | ops->priority = hook.priority; | |
1396 | ops->priv = chain; | |
1397 | ops->hook = afi->hooks[ops->hooknum]; | |
1398 | ops->dev = hook.dev; | |
1399 | if (hookfn) | |
1400 | ops->hook = hookfn; | |
1401 | if (afi->hook_ops_init) | |
1402 | afi->hook_ops_init(ops, i); | |
1403 | } | |
1404 | ||
1405 | chain->flags |= NFT_BASE_CHAIN; | |
1406 | basechain->policy = policy; | |
1407 | } else { | |
1408 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1409 | if (chain == NULL) | |
1410 | return -ENOMEM; | |
1411 | } | |
1412 | INIT_LIST_HEAD(&chain->rules); | |
1413 | chain->handle = nf_tables_alloc_handle(table); | |
1414 | chain->table = table; | |
1415 | chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL); | |
1416 | if (!chain->name) { | |
1417 | err = -ENOMEM; | |
1418 | goto err1; | |
1419 | } | |
1420 | ||
1421 | err = nf_tables_register_hooks(net, table, chain, afi->nops); | |
1422 | if (err < 0) | |
1423 | goto err1; | |
1424 | ||
1425 | ctx->chain = chain; | |
1426 | err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN); | |
1427 | if (err < 0) | |
1428 | goto err2; | |
1429 | ||
1430 | table->use++; | |
1431 | list_add_tail_rcu(&chain->list, &table->chains); | |
1432 | ||
1433 | return 0; | |
1434 | err2: | |
1435 | nf_tables_unregister_hooks(net, table, chain, afi->nops); | |
1436 | err1: | |
1437 | nf_tables_chain_destroy(chain); | |
1438 | ||
1439 | return err; | |
1440 | } | |
1441 | ||
2c4a488a PNA |
1442 | static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy, |
1443 | bool create) | |
1444 | { | |
1445 | const struct nlattr * const *nla = ctx->nla; | |
1446 | struct nft_table *table = ctx->table; | |
1447 | struct nft_chain *chain = ctx->chain; | |
1448 | struct nft_af_info *afi = ctx->afi; | |
1449 | struct nft_base_chain *basechain; | |
1450 | struct nft_stats *stats = NULL; | |
1451 | struct nft_chain_hook hook; | |
1452 | const struct nlattr *name; | |
1453 | struct nf_hook_ops *ops; | |
1454 | struct nft_trans *trans; | |
1455 | int err, i; | |
1456 | ||
1457 | if (nla[NFTA_CHAIN_HOOK]) { | |
1458 | if (!nft_is_base_chain(chain)) | |
1459 | return -EBUSY; | |
1460 | ||
1461 | err = nft_chain_parse_hook(ctx->net, nla, ctx->afi, &hook, | |
1462 | create); | |
1463 | if (err < 0) | |
1464 | return err; | |
1465 | ||
1466 | basechain = nft_base_chain(chain); | |
1467 | if (basechain->type != hook.type) { | |
1468 | nft_chain_release_hook(&hook); | |
1469 | return -EBUSY; | |
1470 | } | |
1471 | ||
1472 | for (i = 0; i < afi->nops; i++) { | |
1473 | ops = &basechain->ops[i]; | |
1474 | if (ops->hooknum != hook.num || | |
1475 | ops->priority != hook.priority || | |
1476 | ops->dev != hook.dev) { | |
1477 | nft_chain_release_hook(&hook); | |
1478 | return -EBUSY; | |
1479 | } | |
1480 | } | |
1481 | nft_chain_release_hook(&hook); | |
1482 | } | |
1483 | ||
1484 | if (nla[NFTA_CHAIN_HANDLE] && | |
1485 | nla[NFTA_CHAIN_NAME]) { | |
1486 | struct nft_chain *chain2; | |
1487 | ||
1488 | chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], | |
1489 | genmask); | |
1490 | if (IS_ERR(chain2)) | |
1491 | return PTR_ERR(chain2); | |
1492 | } | |
1493 | ||
1494 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1495 | if (!nft_is_base_chain(chain)) | |
1496 | return -EOPNOTSUPP; | |
1497 | ||
1498 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1499 | if (IS_ERR(stats)) | |
1500 | return PTR_ERR(stats); | |
1501 | } | |
1502 | ||
1503 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, | |
1504 | sizeof(struct nft_trans_chain)); | |
1505 | if (trans == NULL) { | |
1506 | free_percpu(stats); | |
1507 | return -ENOMEM; | |
1508 | } | |
1509 | ||
1510 | nft_trans_chain_stats(trans) = stats; | |
1511 | nft_trans_chain_update(trans) = true; | |
1512 | ||
1513 | if (nla[NFTA_CHAIN_POLICY]) | |
1514 | nft_trans_chain_policy(trans) = policy; | |
1515 | else | |
1516 | nft_trans_chain_policy(trans) = -1; | |
1517 | ||
1518 | name = nla[NFTA_CHAIN_NAME]; | |
1519 | if (nla[NFTA_CHAIN_HANDLE] && name) { | |
1520 | nft_trans_chain_name(trans) = | |
1521 | nla_strdup(name, GFP_KERNEL); | |
1522 | if (!nft_trans_chain_name(trans)) { | |
1523 | kfree(trans); | |
1524 | free_percpu(stats); | |
1525 | return -ENOMEM; | |
1526 | } | |
1527 | } | |
1528 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
633c9a84 PNA |
1533 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
1534 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1535 | const struct nlattr * const nla[], |
1536 | struct netlink_ext_ack *extack) | |
96518518 PM |
1537 | { |
1538 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1539 | const struct nlattr * uninitialized_var(name); | |
4035285f PNA |
1540 | u8 genmask = nft_genmask_next(net); |
1541 | int family = nfmsg->nfgen_family; | |
7c95f6d8 | 1542 | struct nft_af_info *afi; |
96518518 PM |
1543 | struct nft_table *table; |
1544 | struct nft_chain *chain; | |
57de2a0c | 1545 | u8 policy = NF_ACCEPT; |
4035285f | 1546 | struct nft_ctx ctx; |
96518518 | 1547 | u64 handle = 0; |
96518518 PM |
1548 | bool create; |
1549 | ||
1550 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1551 | ||
99633ab2 | 1552 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
1553 | if (IS_ERR(afi)) |
1554 | return PTR_ERR(afi); | |
1555 | ||
f2a6d766 | 1556 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1557 | if (IS_ERR(table)) |
1558 | return PTR_ERR(table); | |
1559 | ||
96518518 PM |
1560 | chain = NULL; |
1561 | name = nla[NFTA_CHAIN_NAME]; | |
1562 | ||
1563 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1564 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
664b0f8c | 1565 | chain = nf_tables_chain_lookup_byhandle(table, handle, genmask); |
96518518 PM |
1566 | if (IS_ERR(chain)) |
1567 | return PTR_ERR(chain); | |
1568 | } else { | |
664b0f8c | 1569 | chain = nf_tables_chain_lookup(table, name, genmask); |
96518518 PM |
1570 | if (IS_ERR(chain)) { |
1571 | if (PTR_ERR(chain) != -ENOENT) | |
1572 | return PTR_ERR(chain); | |
1573 | chain = NULL; | |
1574 | } | |
1575 | } | |
1576 | ||
57de2a0c | 1577 | if (nla[NFTA_CHAIN_POLICY]) { |
f323d954 PNA |
1578 | if (chain != NULL && |
1579 | !nft_is_base_chain(chain)) | |
d6b6cb1d PNA |
1580 | return -EOPNOTSUPP; |
1581 | ||
1582 | if (chain == NULL && | |
57de2a0c PM |
1583 | nla[NFTA_CHAIN_HOOK] == NULL) |
1584 | return -EOPNOTSUPP; | |
1585 | ||
8f46df18 | 1586 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1587 | switch (policy) { |
1588 | case NF_DROP: | |
1589 | case NF_ACCEPT: | |
1590 | break; | |
1591 | default: | |
1592 | return -EINVAL; | |
1593 | } | |
1594 | } | |
1595 | ||
4035285f PNA |
1596 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
1597 | ||
96518518 PM |
1598 | if (chain != NULL) { |
1599 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1600 | return -EEXIST; | |
1601 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1602 | return -EOPNOTSUPP; | |
1603 | ||
2c4a488a | 1604 | return nf_tables_updchain(&ctx, genmask, policy, create); |
96518518 PM |
1605 | } |
1606 | ||
4035285f | 1607 | return nf_tables_addchain(&ctx, family, genmask, policy, create); |
96518518 PM |
1608 | } |
1609 | ||
633c9a84 PNA |
1610 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
1611 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1612 | const struct nlattr * const nla[], |
1613 | struct netlink_ext_ack *extack) | |
96518518 PM |
1614 | { |
1615 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1616 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 1617 | struct nft_af_info *afi; |
96518518 PM |
1618 | struct nft_table *table; |
1619 | struct nft_chain *chain; | |
1620 | int family = nfmsg->nfgen_family; | |
91c7b38d | 1621 | struct nft_ctx ctx; |
96518518 | 1622 | |
99633ab2 | 1623 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1624 | if (IS_ERR(afi)) |
1625 | return PTR_ERR(afi); | |
1626 | ||
f2a6d766 | 1627 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1628 | if (IS_ERR(table)) |
1629 | return PTR_ERR(table); | |
1630 | ||
664b0f8c | 1631 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1632 | if (IS_ERR(chain)) |
1633 | return PTR_ERR(chain); | |
4fefee57 | 1634 | if (chain->use > 0) |
96518518 PM |
1635 | return -EBUSY; |
1636 | ||
633c9a84 | 1637 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0165d932 | 1638 | |
ee01d542 | 1639 | return nft_delchain(&ctx); |
96518518 PM |
1640 | } |
1641 | ||
96518518 PM |
1642 | /* |
1643 | * Expressions | |
1644 | */ | |
1645 | ||
1646 | /** | |
ef1f7df9 PM |
1647 | * nft_register_expr - register nf_tables expr type |
1648 | * @ops: expr type | |
96518518 | 1649 | * |
ef1f7df9 | 1650 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1651 | * success or a negative errno code otherwise. |
1652 | */ | |
ef1f7df9 | 1653 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1654 | { |
1655 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1656 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1657 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1658 | else |
e688a7f8 | 1659 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1660 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1661 | return 0; | |
1662 | } | |
1663 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1664 | ||
1665 | /** | |
ef1f7df9 PM |
1666 | * nft_unregister_expr - unregister nf_tables expr type |
1667 | * @ops: expr type | |
96518518 | 1668 | * |
ef1f7df9 | 1669 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1670 | */ |
ef1f7df9 | 1671 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1672 | { |
1673 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1674 | list_del_rcu(&type->list); |
96518518 PM |
1675 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1676 | } | |
1677 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1678 | ||
64d46806 PM |
1679 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1680 | struct nlattr *nla) | |
96518518 | 1681 | { |
ef1f7df9 | 1682 | const struct nft_expr_type *type; |
96518518 | 1683 | |
ef1f7df9 | 1684 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1685 | if (!nla_strcmp(nla, type->name) && |
1686 | (!type->family || type->family == family)) | |
ef1f7df9 | 1687 | return type; |
96518518 PM |
1688 | } |
1689 | return NULL; | |
1690 | } | |
1691 | ||
64d46806 PM |
1692 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1693 | struct nlattr *nla) | |
96518518 | 1694 | { |
ef1f7df9 | 1695 | const struct nft_expr_type *type; |
96518518 PM |
1696 | |
1697 | if (nla == NULL) | |
1698 | return ERR_PTR(-EINVAL); | |
1699 | ||
64d46806 | 1700 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1701 | if (type != NULL && try_module_get(type->owner)) |
1702 | return type; | |
96518518 PM |
1703 | |
1704 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1705 | if (type == NULL) { |
64d46806 PM |
1706 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1707 | request_module("nft-expr-%u-%.*s", family, | |
1708 | nla_len(nla), (char *)nla_data(nla)); | |
1709 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1710 | if (__nft_expr_type_get(family, nla)) | |
1711 | return ERR_PTR(-EAGAIN); | |
1712 | ||
96518518 PM |
1713 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1714 | request_module("nft-expr-%.*s", | |
1715 | nla_len(nla), (char *)nla_data(nla)); | |
1716 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1717 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1718 | return ERR_PTR(-EAGAIN); |
1719 | } | |
1720 | #endif | |
1721 | return ERR_PTR(-ENOENT); | |
1722 | } | |
1723 | ||
1724 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1725 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1726 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1727 | }; | |
1728 | ||
1729 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1730 | const struct nft_expr *expr) | |
1731 | { | |
ef1f7df9 | 1732 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1733 | goto nla_put_failure; |
1734 | ||
1735 | if (expr->ops->dump) { | |
1736 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1737 | if (data == NULL) | |
1738 | goto nla_put_failure; | |
1739 | if (expr->ops->dump(skb, expr) < 0) | |
1740 | goto nla_put_failure; | |
1741 | nla_nest_end(skb, data); | |
1742 | } | |
1743 | ||
1744 | return skb->len; | |
1745 | ||
1746 | nla_put_failure: | |
1747 | return -1; | |
1748 | }; | |
1749 | ||
0b2d8a7b PM |
1750 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
1751 | const struct nft_expr *expr) | |
1752 | { | |
1753 | struct nlattr *nest; | |
1754 | ||
1755 | nest = nla_nest_start(skb, attr); | |
1756 | if (!nest) | |
1757 | goto nla_put_failure; | |
1758 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1759 | goto nla_put_failure; | |
1760 | nla_nest_end(skb, nest); | |
1761 | return 0; | |
1762 | ||
1763 | nla_put_failure: | |
1764 | return -1; | |
1765 | } | |
1766 | ||
96518518 PM |
1767 | struct nft_expr_info { |
1768 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1769 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1770 | }; |
1771 | ||
0ca743a5 PNA |
1772 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1773 | const struct nlattr *nla, | |
96518518 PM |
1774 | struct nft_expr_info *info) |
1775 | { | |
ef1f7df9 | 1776 | const struct nft_expr_type *type; |
96518518 | 1777 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1778 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1779 | int err; |
1780 | ||
fceb6435 | 1781 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL); |
96518518 PM |
1782 | if (err < 0) |
1783 | return err; | |
1784 | ||
64d46806 | 1785 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1786 | if (IS_ERR(type)) |
1787 | return PTR_ERR(type); | |
1788 | ||
1789 | if (tb[NFTA_EXPR_DATA]) { | |
1790 | err = nla_parse_nested(info->tb, type->maxattr, | |
fceb6435 | 1791 | tb[NFTA_EXPR_DATA], type->policy, NULL); |
ef1f7df9 PM |
1792 | if (err < 0) |
1793 | goto err1; | |
1794 | } else | |
1795 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1796 | ||
1797 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1798 | ops = type->select_ops(ctx, |
1799 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1800 | if (IS_ERR(ops)) { |
1801 | err = PTR_ERR(ops); | |
1802 | goto err1; | |
1803 | } | |
1804 | } else | |
1805 | ops = type->ops; | |
1806 | ||
96518518 PM |
1807 | info->ops = ops; |
1808 | return 0; | |
ef1f7df9 PM |
1809 | |
1810 | err1: | |
1811 | module_put(type->owner); | |
1812 | return err; | |
96518518 PM |
1813 | } |
1814 | ||
1815 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1816 | const struct nft_expr_info *info, |
96518518 PM |
1817 | struct nft_expr *expr) |
1818 | { | |
1819 | const struct nft_expr_ops *ops = info->ops; | |
1820 | int err; | |
1821 | ||
1822 | expr->ops = ops; | |
1823 | if (ops->init) { | |
ef1f7df9 | 1824 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1825 | if (err < 0) |
1826 | goto err1; | |
1827 | } | |
1828 | ||
c56e3956 LZ |
1829 | if (ops->validate) { |
1830 | const struct nft_data *data = NULL; | |
1831 | ||
1832 | err = ops->validate(ctx, expr, &data); | |
1833 | if (err < 0) | |
1834 | goto err2; | |
1835 | } | |
1836 | ||
96518518 PM |
1837 | return 0; |
1838 | ||
c56e3956 LZ |
1839 | err2: |
1840 | if (ops->destroy) | |
1841 | ops->destroy(ctx, expr); | |
96518518 PM |
1842 | err1: |
1843 | expr->ops = NULL; | |
1844 | return err; | |
1845 | } | |
1846 | ||
62472bce PM |
1847 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1848 | struct nft_expr *expr) | |
96518518 PM |
1849 | { |
1850 | if (expr->ops->destroy) | |
62472bce | 1851 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1852 | module_put(expr->ops->type->owner); |
96518518 PM |
1853 | } |
1854 | ||
0b2d8a7b PM |
1855 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
1856 | const struct nlattr *nla) | |
1857 | { | |
1858 | struct nft_expr_info info; | |
1859 | struct nft_expr *expr; | |
1860 | int err; | |
1861 | ||
1862 | err = nf_tables_expr_parse(ctx, nla, &info); | |
1863 | if (err < 0) | |
1864 | goto err1; | |
1865 | ||
1866 | err = -ENOMEM; | |
1867 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
1868 | if (expr == NULL) | |
1869 | goto err2; | |
1870 | ||
1871 | err = nf_tables_newexpr(ctx, &info, expr); | |
1872 | if (err < 0) | |
6cafaf47 | 1873 | goto err3; |
0b2d8a7b PM |
1874 | |
1875 | return expr; | |
6cafaf47 LZ |
1876 | err3: |
1877 | kfree(expr); | |
0b2d8a7b PM |
1878 | err2: |
1879 | module_put(info.ops->type->owner); | |
1880 | err1: | |
1881 | return ERR_PTR(err); | |
1882 | } | |
1883 | ||
1884 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
1885 | { | |
1886 | nf_tables_expr_destroy(ctx, expr); | |
1887 | kfree(expr); | |
1888 | } | |
1889 | ||
96518518 PM |
1890 | /* |
1891 | * Rules | |
1892 | */ | |
1893 | ||
1894 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1895 | u64 handle) | |
1896 | { | |
1897 | struct nft_rule *rule; | |
1898 | ||
1899 | // FIXME: this sucks | |
1900 | list_for_each_entry(rule, &chain->rules, list) { | |
1901 | if (handle == rule->handle) | |
1902 | return rule; | |
1903 | } | |
1904 | ||
1905 | return ERR_PTR(-ENOENT); | |
1906 | } | |
1907 | ||
1908 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1909 | const struct nlattr *nla) | |
1910 | { | |
1911 | if (nla == NULL) | |
1912 | return ERR_PTR(-EINVAL); | |
1913 | ||
1914 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1915 | } | |
1916 | ||
1917 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
b2fbd044 LZ |
1918 | [NFTA_RULE_TABLE] = { .type = NLA_STRING, |
1919 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
1920 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
1921 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1922 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1923 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1924 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1925 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1926 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1927 | .len = NFT_USERDATA_MAXLEN }, | |
96518518 PM |
1928 | }; |
1929 | ||
84d7fce6 PNA |
1930 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
1931 | u32 portid, u32 seq, int event, | |
1932 | u32 flags, int family, | |
96518518 PM |
1933 | const struct nft_table *table, |
1934 | const struct nft_chain *chain, | |
1935 | const struct nft_rule *rule) | |
1936 | { | |
1937 | struct nlmsghdr *nlh; | |
1938 | struct nfgenmsg *nfmsg; | |
1939 | const struct nft_expr *expr, *next; | |
1940 | struct nlattr *list; | |
5e948466 | 1941 | const struct nft_rule *prule; |
dedb67c4 | 1942 | u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 | 1943 | |
dedb67c4 | 1944 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags); |
96518518 PM |
1945 | if (nlh == NULL) |
1946 | goto nla_put_failure; | |
1947 | ||
1948 | nfmsg = nlmsg_data(nlh); | |
1949 | nfmsg->nfgen_family = family; | |
1950 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1951 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1952 | |
1953 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1954 | goto nla_put_failure; | |
1955 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1956 | goto nla_put_failure; | |
b46f6ded ND |
1957 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), |
1958 | NFTA_RULE_PAD)) | |
96518518 PM |
1959 | goto nla_put_failure; |
1960 | ||
5e948466 | 1961 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
cbbb40e2 | 1962 | prule = list_prev_entry(rule, list); |
5e948466 | 1963 | if (nla_put_be64(skb, NFTA_RULE_POSITION, |
b46f6ded ND |
1964 | cpu_to_be64(prule->handle), |
1965 | NFTA_RULE_PAD)) | |
5e948466 EL |
1966 | goto nla_put_failure; |
1967 | } | |
1968 | ||
96518518 PM |
1969 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
1970 | if (list == NULL) | |
1971 | goto nla_put_failure; | |
1972 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 1973 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 1974 | goto nla_put_failure; |
96518518 PM |
1975 | } |
1976 | nla_nest_end(skb, list); | |
1977 | ||
86f1ec32 PM |
1978 | if (rule->udata) { |
1979 | struct nft_userdata *udata = nft_userdata(rule); | |
1980 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
1981 | udata->data) < 0) | |
1982 | goto nla_put_failure; | |
1983 | } | |
0768b3b3 | 1984 | |
053c095a JB |
1985 | nlmsg_end(skb, nlh); |
1986 | return 0; | |
96518518 PM |
1987 | |
1988 | nla_put_failure: | |
1989 | nlmsg_trim(skb, nlh); | |
1990 | return -1; | |
1991 | } | |
1992 | ||
25e94a99 PNA |
1993 | static void nf_tables_rule_notify(const struct nft_ctx *ctx, |
1994 | const struct nft_rule *rule, int event) | |
96518518 PM |
1995 | { |
1996 | struct sk_buff *skb; | |
96518518 PM |
1997 | int err; |
1998 | ||
128ad332 PNA |
1999 | if (!ctx->report && |
2000 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 2001 | return; |
96518518 | 2002 | |
96518518 PM |
2003 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
2004 | if (skb == NULL) | |
2005 | goto err; | |
2006 | ||
84d7fce6 PNA |
2007 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
2008 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 2009 | ctx->chain, rule); |
96518518 PM |
2010 | if (err < 0) { |
2011 | kfree_skb(skb); | |
2012 | goto err; | |
2013 | } | |
2014 | ||
25e94a99 PNA |
2015 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
2016 | ctx->report, GFP_KERNEL); | |
2017 | return; | |
96518518 | 2018 | err: |
25e94a99 | 2019 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
2020 | } |
2021 | ||
6e1f760e | 2022 | struct nft_rule_dump_ctx { |
e46abbcc | 2023 | char *table; |
b7263e07 | 2024 | char *chain; |
6e1f760e PNA |
2025 | }; |
2026 | ||
96518518 PM |
2027 | static int nf_tables_dump_rules(struct sk_buff *skb, |
2028 | struct netlink_callback *cb) | |
2029 | { | |
2030 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
6e1f760e | 2031 | const struct nft_rule_dump_ctx *ctx = cb->data; |
96518518 PM |
2032 | const struct nft_af_info *afi; |
2033 | const struct nft_table *table; | |
2034 | const struct nft_chain *chain; | |
2035 | const struct nft_rule *rule; | |
2036 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 2037 | struct net *net = sock_net(skb->sk); |
96518518 PM |
2038 | int family = nfmsg->nfgen_family; |
2039 | ||
e688a7f8 | 2040 | rcu_read_lock(); |
38e029f1 PNA |
2041 | cb->seq = net->nft.base_seq; |
2042 | ||
e688a7f8 | 2043 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
2044 | if (family != NFPROTO_UNSPEC && family != afi->family) |
2045 | continue; | |
2046 | ||
e688a7f8 | 2047 | list_for_each_entry_rcu(table, &afi->tables, list) { |
e46abbcc | 2048 | if (ctx && ctx->table && |
6e1f760e PNA |
2049 | strcmp(ctx->table, table->name) != 0) |
2050 | continue; | |
2051 | ||
e688a7f8 | 2052 | list_for_each_entry_rcu(chain, &table->chains, list) { |
6e1f760e PNA |
2053 | if (ctx && ctx->chain[0] && |
2054 | strcmp(ctx->chain, chain->name) != 0) | |
2055 | continue; | |
2056 | ||
e688a7f8 | 2057 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
889f7ee7 | 2058 | if (!nft_is_active(net, rule)) |
0628b123 | 2059 | goto cont; |
96518518 PM |
2060 | if (idx < s_idx) |
2061 | goto cont; | |
2062 | if (idx > s_idx) | |
2063 | memset(&cb->args[1], 0, | |
2064 | sizeof(cb->args) - sizeof(cb->args[0])); | |
84d7fce6 | 2065 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, |
96518518 PM |
2066 | cb->nlh->nlmsg_seq, |
2067 | NFT_MSG_NEWRULE, | |
2068 | NLM_F_MULTI | NLM_F_APPEND, | |
2069 | afi->family, table, chain, rule) < 0) | |
2070 | goto done; | |
38e029f1 PNA |
2071 | |
2072 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
2073 | cont: |
2074 | idx++; | |
2075 | } | |
2076 | } | |
2077 | } | |
2078 | } | |
2079 | done: | |
e688a7f8 PNA |
2080 | rcu_read_unlock(); |
2081 | ||
96518518 PM |
2082 | cb->args[0] = idx; |
2083 | return skb->len; | |
2084 | } | |
2085 | ||
6e1f760e PNA |
2086 | static int nf_tables_dump_rules_done(struct netlink_callback *cb) |
2087 | { | |
e46abbcc PS |
2088 | struct nft_rule_dump_ctx *ctx = cb->data; |
2089 | ||
2090 | if (ctx) { | |
2091 | kfree(ctx->table); | |
b7263e07 | 2092 | kfree(ctx->chain); |
e46abbcc PS |
2093 | kfree(ctx); |
2094 | } | |
6e1f760e PNA |
2095 | return 0; |
2096 | } | |
2097 | ||
7b8002a1 PNA |
2098 | static int nf_tables_getrule(struct net *net, struct sock *nlsk, |
2099 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2100 | const struct nlattr * const nla[], |
2101 | struct netlink_ext_ack *extack) | |
96518518 PM |
2102 | { |
2103 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2104 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
2105 | const struct nft_af_info *afi; |
2106 | const struct nft_table *table; | |
2107 | const struct nft_chain *chain; | |
2108 | const struct nft_rule *rule; | |
2109 | struct sk_buff *skb2; | |
2110 | int family = nfmsg->nfgen_family; | |
2111 | int err; | |
2112 | ||
2113 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2114 | struct netlink_dump_control c = { | |
2115 | .dump = nf_tables_dump_rules, | |
6e1f760e | 2116 | .done = nf_tables_dump_rules_done, |
96518518 | 2117 | }; |
6e1f760e PNA |
2118 | |
2119 | if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { | |
2120 | struct nft_rule_dump_ctx *ctx; | |
2121 | ||
2122 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
2123 | if (!ctx) | |
2124 | return -ENOMEM; | |
2125 | ||
e46abbcc PS |
2126 | if (nla[NFTA_RULE_TABLE]) { |
2127 | ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], | |
2128 | GFP_KERNEL); | |
2129 | if (!ctx->table) { | |
2130 | kfree(ctx); | |
2131 | return -ENOMEM; | |
2132 | } | |
2133 | } | |
b7263e07 PS |
2134 | if (nla[NFTA_RULE_CHAIN]) { |
2135 | ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], | |
2136 | GFP_KERNEL); | |
2137 | if (!ctx->chain) { | |
2138 | kfree(ctx->table); | |
2139 | kfree(ctx); | |
2140 | return -ENOMEM; | |
2141 | } | |
2142 | } | |
6e1f760e PNA |
2143 | c.data = ctx; |
2144 | } | |
2145 | ||
96518518 PM |
2146 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2147 | } | |
2148 | ||
99633ab2 | 2149 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2150 | if (IS_ERR(afi)) |
2151 | return PTR_ERR(afi); | |
2152 | ||
f2a6d766 | 2153 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2154 | if (IS_ERR(table)) |
2155 | return PTR_ERR(table); | |
2156 | ||
664b0f8c | 2157 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2158 | if (IS_ERR(chain)) |
2159 | return PTR_ERR(chain); | |
2160 | ||
2161 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
2162 | if (IS_ERR(rule)) | |
2163 | return PTR_ERR(rule); | |
2164 | ||
2165 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2166 | if (!skb2) | |
2167 | return -ENOMEM; | |
2168 | ||
84d7fce6 | 2169 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
2170 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
2171 | family, table, chain, rule); | |
2172 | if (err < 0) | |
2173 | goto err; | |
2174 | ||
2175 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2176 | ||
2177 | err: | |
2178 | kfree_skb(skb2); | |
2179 | return err; | |
2180 | } | |
2181 | ||
62472bce PM |
2182 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
2183 | struct nft_rule *rule) | |
96518518 | 2184 | { |
96518518 PM |
2185 | struct nft_expr *expr; |
2186 | ||
2187 | /* | |
2188 | * Careful: some expressions might not be initialized in case this | |
2189 | * is called on error from nf_tables_newrule(). | |
2190 | */ | |
2191 | expr = nft_expr_first(rule); | |
3e38df13 | 2192 | while (expr != nft_expr_last(rule) && expr->ops) { |
62472bce | 2193 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
2194 | expr = nft_expr_next(expr); |
2195 | } | |
2196 | kfree(rule); | |
2197 | } | |
2198 | ||
1081d11b PNA |
2199 | #define NFT_RULE_MAXEXPRS 128 |
2200 | ||
2201 | static struct nft_expr_info *info; | |
2202 | ||
633c9a84 PNA |
2203 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
2204 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2205 | const struct nlattr * const nla[], |
2206 | struct netlink_ext_ack *extack) | |
96518518 PM |
2207 | { |
2208 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2209 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2210 | struct nft_af_info *afi; |
96518518 PM |
2211 | struct nft_table *table; |
2212 | struct nft_chain *chain; | |
2213 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 2214 | struct nft_userdata *udata; |
1081d11b | 2215 | struct nft_trans *trans = NULL; |
96518518 PM |
2216 | struct nft_expr *expr; |
2217 | struct nft_ctx ctx; | |
2218 | struct nlattr *tmp; | |
86f1ec32 | 2219 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 PM |
2220 | int err, rem; |
2221 | bool create; | |
5e948466 | 2222 | u64 handle, pos_handle; |
96518518 PM |
2223 | |
2224 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
2225 | ||
99633ab2 | 2226 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
2227 | if (IS_ERR(afi)) |
2228 | return PTR_ERR(afi); | |
2229 | ||
f2a6d766 | 2230 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2231 | if (IS_ERR(table)) |
2232 | return PTR_ERR(table); | |
2233 | ||
664b0f8c | 2234 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2235 | if (IS_ERR(chain)) |
2236 | return PTR_ERR(chain); | |
2237 | ||
2238 | if (nla[NFTA_RULE_HANDLE]) { | |
2239 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
2240 | rule = __nf_tables_rule_lookup(chain, handle); | |
2241 | if (IS_ERR(rule)) | |
2242 | return PTR_ERR(rule); | |
2243 | ||
2244 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2245 | return -EEXIST; | |
2246 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2247 | old_rule = rule; | |
2248 | else | |
2249 | return -EOPNOTSUPP; | |
2250 | } else { | |
2251 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
2252 | return -EINVAL; | |
2253 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
2254 | |
2255 | if (chain->use == UINT_MAX) | |
2256 | return -EOVERFLOW; | |
96518518 PM |
2257 | } |
2258 | ||
5e948466 EL |
2259 | if (nla[NFTA_RULE_POSITION]) { |
2260 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2261 | return -EOPNOTSUPP; | |
2262 | ||
2263 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
2264 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
2265 | if (IS_ERR(old_rule)) | |
2266 | return PTR_ERR(old_rule); | |
2267 | } | |
2268 | ||
633c9a84 | 2269 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0ca743a5 | 2270 | |
96518518 PM |
2271 | n = 0; |
2272 | size = 0; | |
2273 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2274 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
2275 | err = -EINVAL; | |
2276 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2277 | goto err1; | |
2278 | if (n == NFT_RULE_MAXEXPRS) | |
2279 | goto err1; | |
0ca743a5 | 2280 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2281 | if (err < 0) |
2282 | goto err1; | |
2283 | size += info[n].ops->size; | |
2284 | n++; | |
2285 | } | |
2286 | } | |
9889840f PM |
2287 | /* Check for overflow of dlen field */ |
2288 | err = -EFBIG; | |
2289 | if (size >= 1 << 12) | |
2290 | goto err1; | |
96518518 | 2291 | |
86f1ec32 | 2292 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2293 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2294 | if (ulen > 0) |
2295 | usize = sizeof(struct nft_userdata) + ulen; | |
2296 | } | |
0768b3b3 | 2297 | |
96518518 | 2298 | err = -ENOMEM; |
86f1ec32 | 2299 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2300 | if (rule == NULL) |
2301 | goto err1; | |
2302 | ||
889f7ee7 | 2303 | nft_activate_next(net, rule); |
0628b123 | 2304 | |
96518518 PM |
2305 | rule->handle = handle; |
2306 | rule->dlen = size; | |
86f1ec32 | 2307 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2308 | |
86f1ec32 PM |
2309 | if (ulen) { |
2310 | udata = nft_userdata(rule); | |
2311 | udata->len = ulen - 1; | |
2312 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2313 | } | |
96518518 | 2314 | |
96518518 PM |
2315 | expr = nft_expr_first(rule); |
2316 | for (i = 0; i < n; i++) { | |
2317 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2318 | if (err < 0) | |
2319 | goto err2; | |
ef1f7df9 | 2320 | info[i].ops = NULL; |
96518518 PM |
2321 | expr = nft_expr_next(expr); |
2322 | } | |
2323 | ||
96518518 | 2324 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
889f7ee7 | 2325 | if (nft_is_active_next(net, old_rule)) { |
ac904ac8 | 2326 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
b380e5c7 | 2327 | old_rule); |
1081d11b | 2328 | if (trans == NULL) { |
0628b123 PNA |
2329 | err = -ENOMEM; |
2330 | goto err2; | |
2331 | } | |
889f7ee7 | 2332 | nft_deactivate_next(net, old_rule); |
ac34b861 | 2333 | chain->use--; |
5bc5c307 | 2334 | list_add_tail_rcu(&rule->list, &old_rule->list); |
0628b123 PNA |
2335 | } else { |
2336 | err = -ENOENT; | |
2337 | goto err2; | |
2338 | } | |
96518518 | 2339 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
2340 | if (old_rule) |
2341 | list_add_rcu(&rule->list, &old_rule->list); | |
2342 | else | |
2343 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2344 | else { | |
2345 | if (old_rule) | |
2346 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2347 | else | |
2348 | list_add_rcu(&rule->list, &chain->rules); | |
2349 | } | |
96518518 | 2350 | |
b380e5c7 | 2351 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
0628b123 PNA |
2352 | err = -ENOMEM; |
2353 | goto err3; | |
2354 | } | |
4fefee57 | 2355 | chain->use++; |
96518518 PM |
2356 | return 0; |
2357 | ||
0628b123 PNA |
2358 | err3: |
2359 | list_del_rcu(&rule->list); | |
96518518 | 2360 | err2: |
62472bce | 2361 | nf_tables_rule_destroy(&ctx, rule); |
96518518 PM |
2362 | err1: |
2363 | for (i = 0; i < n; i++) { | |
2364 | if (info[i].ops != NULL) | |
ef1f7df9 | 2365 | module_put(info[i].ops->type->owner); |
96518518 PM |
2366 | } |
2367 | return err; | |
2368 | } | |
2369 | ||
1a94e38d PNA |
2370 | static struct nft_rule *nft_rule_lookup_byid(const struct net *net, |
2371 | const struct nlattr *nla) | |
2372 | { | |
2373 | u32 id = ntohl(nla_get_be32(nla)); | |
2374 | struct nft_trans *trans; | |
2375 | ||
2376 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
2377 | struct nft_rule *rule = nft_trans_rule(trans); | |
2378 | ||
2379 | if (trans->msg_type == NFT_MSG_NEWRULE && | |
2380 | id == nft_trans_rule_id(trans)) | |
2381 | return rule; | |
2382 | } | |
2383 | return ERR_PTR(-ENOENT); | |
2384 | } | |
2385 | ||
633c9a84 PNA |
2386 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
2387 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2388 | const struct nlattr * const nla[], |
2389 | struct netlink_ext_ack *extack) | |
96518518 PM |
2390 | { |
2391 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2392 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2393 | struct nft_af_info *afi; |
7c95f6d8 | 2394 | struct nft_table *table; |
cf9dc09d PNA |
2395 | struct nft_chain *chain = NULL; |
2396 | struct nft_rule *rule; | |
0628b123 PNA |
2397 | int family = nfmsg->nfgen_family, err = 0; |
2398 | struct nft_ctx ctx; | |
96518518 | 2399 | |
99633ab2 | 2400 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2401 | if (IS_ERR(afi)) |
2402 | return PTR_ERR(afi); | |
2403 | ||
f2a6d766 | 2404 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2405 | if (IS_ERR(table)) |
2406 | return PTR_ERR(table); | |
2407 | ||
cf9dc09d | 2408 | if (nla[NFTA_RULE_CHAIN]) { |
664b0f8c PNA |
2409 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], |
2410 | genmask); | |
cf9dc09d PNA |
2411 | if (IS_ERR(chain)) |
2412 | return PTR_ERR(chain); | |
2413 | } | |
96518518 | 2414 | |
633c9a84 | 2415 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0628b123 | 2416 | |
cf9dc09d PNA |
2417 | if (chain) { |
2418 | if (nla[NFTA_RULE_HANDLE]) { | |
2419 | rule = nf_tables_rule_lookup(chain, | |
2420 | nla[NFTA_RULE_HANDLE]); | |
2421 | if (IS_ERR(rule)) | |
2422 | return PTR_ERR(rule); | |
96518518 | 2423 | |
1a94e38d PNA |
2424 | err = nft_delrule(&ctx, rule); |
2425 | } else if (nla[NFTA_RULE_ID]) { | |
2426 | rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]); | |
2427 | if (IS_ERR(rule)) | |
2428 | return PTR_ERR(rule); | |
2429 | ||
5e266fe7 | 2430 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2431 | } else { |
ce24b721 | 2432 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2433 | } |
2434 | } else { | |
2435 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
2436 | if (!nft_is_active_next(net, chain)) |
2437 | continue; | |
2438 | ||
cf9dc09d | 2439 | ctx.chain = chain; |
ce24b721 | 2440 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2441 | if (err < 0) |
2442 | break; | |
2443 | } | |
2444 | } | |
2445 | ||
2446 | return err; | |
2447 | } | |
2448 | ||
20a69341 PM |
2449 | /* |
2450 | * Sets | |
2451 | */ | |
2452 | ||
2b664957 | 2453 | static LIST_HEAD(nf_tables_set_types); |
20a69341 | 2454 | |
2b664957 | 2455 | int nft_register_set(struct nft_set_type *type) |
20a69341 PM |
2456 | { |
2457 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2458 | list_add_tail_rcu(&type->list, &nf_tables_set_types); |
20a69341 PM |
2459 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2460 | return 0; | |
2461 | } | |
2462 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2463 | ||
2b664957 | 2464 | void nft_unregister_set(struct nft_set_type *type) |
20a69341 PM |
2465 | { |
2466 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2467 | list_del_rcu(&type->list); |
20a69341 PM |
2468 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2469 | } | |
2470 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2471 | ||
2b664957 PNA |
2472 | #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ |
2473 | NFT_SET_TIMEOUT | NFT_SET_OBJECT) | |
2474 | ||
2475 | static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags) | |
2476 | { | |
2477 | return (flags & ops->features) == (flags & NFT_SET_FEATURES); | |
2478 | } | |
2479 | ||
c50b960c PM |
2480 | /* |
2481 | * Select a set implementation based on the data characteristics and the | |
2482 | * given policy. The total memory use might not be known if no size is | |
2483 | * given, in that case the amount of memory per element is used. | |
2484 | */ | |
2485 | static const struct nft_set_ops * | |
2b664957 PNA |
2486 | nft_select_set_ops(const struct nft_ctx *ctx, |
2487 | const struct nlattr * const nla[], | |
c50b960c PM |
2488 | const struct nft_set_desc *desc, |
2489 | enum nft_set_policies policy) | |
20a69341 | 2490 | { |
c50b960c PM |
2491 | const struct nft_set_ops *ops, *bops; |
2492 | struct nft_set_estimate est, best; | |
2b664957 PNA |
2493 | const struct nft_set_type *type; |
2494 | u32 flags = 0; | |
20a69341 PM |
2495 | |
2496 | #ifdef CONFIG_MODULES | |
2b664957 | 2497 | if (list_empty(&nf_tables_set_types)) { |
20a69341 PM |
2498 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2499 | request_module("nft-set"); | |
2500 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2501 | if (!list_empty(&nf_tables_set_types)) |
20a69341 PM |
2502 | return ERR_PTR(-EAGAIN); |
2503 | } | |
2504 | #endif | |
2b664957 PNA |
2505 | if (nla[NFTA_SET_FLAGS] != NULL) |
2506 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
20a69341 | 2507 | |
55af753c PNA |
2508 | bops = NULL; |
2509 | best.size = ~0; | |
2510 | best.lookup = ~0; | |
0b5a7874 | 2511 | best.space = ~0; |
c50b960c | 2512 | |
2b664957 PNA |
2513 | list_for_each_entry(type, &nf_tables_set_types, list) { |
2514 | if (!type->select_ops) | |
2515 | ops = type->ops; | |
2516 | else | |
2517 | ops = type->select_ops(ctx, desc, flags); | |
2518 | if (!ops) | |
2519 | continue; | |
2520 | ||
2521 | if (!nft_set_ops_candidate(ops, flags)) | |
20a69341 | 2522 | continue; |
2b664957 | 2523 | if (!ops->estimate(desc, flags, &est)) |
c50b960c PM |
2524 | continue; |
2525 | ||
2526 | switch (policy) { | |
2527 | case NFT_SET_POL_PERFORMANCE: | |
55af753c | 2528 | if (est.lookup < best.lookup) |
c50b960c | 2529 | break; |
0b5a7874 PNA |
2530 | if (est.lookup == best.lookup) { |
2531 | if (!desc->size) { | |
2532 | if (est.space < best.space) | |
2533 | break; | |
2534 | } else if (est.size < best.size) { | |
2535 | break; | |
2536 | } | |
2537 | } | |
c50b960c PM |
2538 | continue; |
2539 | case NFT_SET_POL_MEMORY: | |
0b5a7874 PNA |
2540 | if (!desc->size) { |
2541 | if (est.space < best.space) | |
2542 | break; | |
2543 | if (est.space == best.space && | |
2544 | est.lookup < best.lookup) | |
2545 | break; | |
2546 | } else if (est.size < best.size) { | |
c50b960c | 2547 | break; |
0b5a7874 | 2548 | } |
c50b960c PM |
2549 | continue; |
2550 | default: | |
2551 | break; | |
2552 | } | |
2553 | ||
2b664957 | 2554 | if (!try_module_get(type->owner)) |
20a69341 | 2555 | continue; |
c50b960c | 2556 | if (bops != NULL) |
2b664957 | 2557 | module_put(bops->type->owner); |
c50b960c PM |
2558 | |
2559 | bops = ops; | |
2560 | best = est; | |
20a69341 PM |
2561 | } |
2562 | ||
c50b960c PM |
2563 | if (bops != NULL) |
2564 | return bops; | |
2565 | ||
20a69341 PM |
2566 | return ERR_PTR(-EOPNOTSUPP); |
2567 | } | |
2568 | ||
2569 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
b2fbd044 LZ |
2570 | [NFTA_SET_TABLE] = { .type = NLA_STRING, |
2571 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
a9bdd836 | 2572 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
cb39ad8b | 2573 | .len = NFT_SET_MAXNAMELEN - 1 }, |
20a69341 PM |
2574 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2575 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2576 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2577 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2578 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2579 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2580 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2581 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2582 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2583 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
e6d8ecac CFG |
2584 | [NFTA_SET_USERDATA] = { .type = NLA_BINARY, |
2585 | .len = NFT_USERDATA_MAXLEN }, | |
8aeff920 | 2586 | [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, |
c50b960c PM |
2587 | }; |
2588 | ||
2589 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2590 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2591 | }; |
2592 | ||
633c9a84 | 2593 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
2594 | const struct sk_buff *skb, |
2595 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
2596 | const struct nlattr * const nla[], |
2597 | u8 genmask) | |
20a69341 PM |
2598 | { |
2599 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
2600 | struct nft_af_info *afi = NULL; |
2601 | struct nft_table *table = NULL; | |
20a69341 | 2602 | |
c9c8e485 PNA |
2603 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
2604 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
2605 | if (IS_ERR(afi)) | |
2606 | return PTR_ERR(afi); | |
2607 | } | |
20a69341 PM |
2608 | |
2609 | if (nla[NFTA_SET_TABLE] != NULL) { | |
ec2c9935 PM |
2610 | if (afi == NULL) |
2611 | return -EAFNOSUPPORT; | |
2612 | ||
f2a6d766 PNA |
2613 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], |
2614 | genmask); | |
20a69341 PM |
2615 | if (IS_ERR(table)) |
2616 | return PTR_ERR(table); | |
2617 | } | |
2618 | ||
633c9a84 | 2619 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2620 | return 0; |
2621 | } | |
2622 | ||
c7a72e3f PNA |
2623 | static struct nft_set *nf_tables_set_lookup(const struct nft_table *table, |
2624 | const struct nlattr *nla, u8 genmask) | |
20a69341 PM |
2625 | { |
2626 | struct nft_set *set; | |
2627 | ||
2628 | if (nla == NULL) | |
2629 | return ERR_PTR(-EINVAL); | |
2630 | ||
2631 | list_for_each_entry(set, &table->sets, list) { | |
37a9cc52 PNA |
2632 | if (!nla_strcmp(nla, set->name) && |
2633 | nft_active_genmask(set, genmask)) | |
20a69341 PM |
2634 | return set; |
2635 | } | |
2636 | return ERR_PTR(-ENOENT); | |
2637 | } | |
2638 | ||
c7a72e3f PNA |
2639 | static struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
2640 | const struct nlattr *nla, | |
2641 | u8 genmask) | |
958bee14 PNA |
2642 | { |
2643 | struct nft_trans *trans; | |
2644 | u32 id = ntohl(nla_get_be32(nla)); | |
2645 | ||
2646 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
37a9cc52 PNA |
2647 | struct nft_set *set = nft_trans_set(trans); |
2648 | ||
958bee14 | 2649 | if (trans->msg_type == NFT_MSG_NEWSET && |
37a9cc52 PNA |
2650 | id == nft_trans_set_id(trans) && |
2651 | nft_active_genmask(set, genmask)) | |
2652 | return set; | |
958bee14 PNA |
2653 | } |
2654 | return ERR_PTR(-ENOENT); | |
2655 | } | |
c7a72e3f PNA |
2656 | |
2657 | struct nft_set *nft_set_lookup(const struct net *net, | |
2658 | const struct nft_table *table, | |
2659 | const struct nlattr *nla_set_name, | |
2660 | const struct nlattr *nla_set_id, | |
2661 | u8 genmask) | |
2662 | { | |
2663 | struct nft_set *set; | |
2664 | ||
2665 | set = nf_tables_set_lookup(table, nla_set_name, genmask); | |
2666 | if (IS_ERR(set)) { | |
2667 | if (!nla_set_id) | |
2668 | return set; | |
2669 | ||
2670 | set = nf_tables_set_lookup_byid(net, nla_set_id, genmask); | |
2671 | } | |
2672 | return set; | |
2673 | } | |
2674 | EXPORT_SYMBOL_GPL(nft_set_lookup); | |
958bee14 | 2675 | |
20a69341 PM |
2676 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
2677 | const char *name) | |
2678 | { | |
2679 | const struct nft_set *i; | |
2680 | const char *p; | |
2681 | unsigned long *inuse; | |
60eb1894 | 2682 | unsigned int n = 0, min = 0; |
20a69341 | 2683 | |
38745490 | 2684 | p = strchr(name, '%'); |
20a69341 PM |
2685 | if (p != NULL) { |
2686 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2687 | return -EINVAL; | |
2688 | ||
2689 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2690 | if (inuse == NULL) | |
2691 | return -ENOMEM; | |
60eb1894 | 2692 | cont: |
20a69341 | 2693 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2694 | int tmp; |
2695 | ||
37a9cc52 PNA |
2696 | if (!nft_is_active_next(ctx->net, set)) |
2697 | continue; | |
14662917 | 2698 | if (!sscanf(i->name, name, &tmp)) |
20a69341 | 2699 | continue; |
60eb1894 | 2700 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2701 | continue; |
14662917 | 2702 | |
60eb1894 | 2703 | set_bit(tmp - min, inuse); |
20a69341 PM |
2704 | } |
2705 | ||
53b70287 | 2706 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2707 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2708 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2709 | memset(inuse, 0, PAGE_SIZE); | |
2710 | goto cont; | |
2711 | } | |
20a69341 PM |
2712 | free_page((unsigned long)inuse); |
2713 | } | |
2714 | ||
38745490 PS |
2715 | set->name = kasprintf(GFP_KERNEL, name, min + n); |
2716 | if (!set->name) | |
2717 | return -ENOMEM; | |
2718 | ||
20a69341 | 2719 | list_for_each_entry(i, &ctx->table->sets, list) { |
37a9cc52 PNA |
2720 | if (!nft_is_active_next(ctx->net, i)) |
2721 | continue; | |
20a69341 PM |
2722 | if (!strcmp(set->name, i->name)) |
2723 | return -ENFILE; | |
2724 | } | |
2725 | return 0; | |
2726 | } | |
2727 | ||
2728 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2729 | const struct nft_set *set, u16 event, u16 flags) | |
2730 | { | |
2731 | struct nfgenmsg *nfmsg; | |
2732 | struct nlmsghdr *nlh; | |
c50b960c | 2733 | struct nlattr *desc; |
128ad332 PNA |
2734 | u32 portid = ctx->portid; |
2735 | u32 seq = ctx->seq; | |
20a69341 | 2736 | |
dedb67c4 | 2737 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
20a69341 PM |
2738 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
2739 | flags); | |
2740 | if (nlh == NULL) | |
2741 | goto nla_put_failure; | |
2742 | ||
2743 | nfmsg = nlmsg_data(nlh); | |
2744 | nfmsg->nfgen_family = ctx->afi->family; | |
2745 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2746 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
2747 | |
2748 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2749 | goto nla_put_failure; | |
2750 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2751 | goto nla_put_failure; | |
2752 | if (set->flags != 0) | |
2753 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2754 | goto nla_put_failure; | |
2755 | ||
2756 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2757 | goto nla_put_failure; | |
2758 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2759 | goto nla_put_failure; | |
2760 | if (set->flags & NFT_SET_MAP) { | |
2761 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2762 | goto nla_put_failure; | |
2763 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2764 | goto nla_put_failure; | |
2765 | } | |
8aeff920 PNA |
2766 | if (set->flags & NFT_SET_OBJECT && |
2767 | nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) | |
2768 | goto nla_put_failure; | |
20a69341 | 2769 | |
761da293 | 2770 | if (set->timeout && |
d3e2a111 AP |
2771 | nla_put_be64(skb, NFTA_SET_TIMEOUT, |
2772 | cpu_to_be64(jiffies_to_msecs(set->timeout)), | |
b46f6ded | 2773 | NFTA_SET_PAD)) |
761da293 PM |
2774 | goto nla_put_failure; |
2775 | if (set->gc_int && | |
2776 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
2777 | goto nla_put_failure; | |
2778 | ||
9363dc4b AB |
2779 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
2780 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
2781 | goto nla_put_failure; | |
2782 | } | |
2783 | ||
e6d8ecac CFG |
2784 | if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) |
2785 | goto nla_put_failure; | |
2786 | ||
c50b960c PM |
2787 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
2788 | if (desc == NULL) | |
2789 | goto nla_put_failure; | |
2790 | if (set->size && | |
2791 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
2792 | goto nla_put_failure; | |
2793 | nla_nest_end(skb, desc); | |
2794 | ||
053c095a JB |
2795 | nlmsg_end(skb, nlh); |
2796 | return 0; | |
20a69341 PM |
2797 | |
2798 | nla_put_failure: | |
2799 | nlmsg_trim(skb, nlh); | |
2800 | return -1; | |
2801 | } | |
2802 | ||
25e94a99 PNA |
2803 | static void nf_tables_set_notify(const struct nft_ctx *ctx, |
2804 | const struct nft_set *set, int event, | |
2805 | gfp_t gfp_flags) | |
20a69341 PM |
2806 | { |
2807 | struct sk_buff *skb; | |
128ad332 | 2808 | u32 portid = ctx->portid; |
20a69341 PM |
2809 | int err; |
2810 | ||
128ad332 PNA |
2811 | if (!ctx->report && |
2812 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 2813 | return; |
20a69341 | 2814 | |
31f8441c | 2815 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
2816 | if (skb == NULL) |
2817 | goto err; | |
2818 | ||
2819 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2820 | if (err < 0) { | |
2821 | kfree_skb(skb); | |
2822 | goto err; | |
2823 | } | |
2824 | ||
25e94a99 PNA |
2825 | nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report, |
2826 | gfp_flags); | |
2827 | return; | |
20a69341 | 2828 | err: |
25e94a99 | 2829 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
20a69341 PM |
2830 | } |
2831 | ||
5b96af77 | 2832 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
2833 | { |
2834 | const struct nft_set *set; | |
2835 | unsigned int idx, s_idx = cb->args[0]; | |
7c95f6d8 | 2836 | struct nft_af_info *afi; |
c9c8e485 PNA |
2837 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2838 | struct net *net = sock_net(skb->sk); | |
2839 | int cur_family = cb->args[3]; | |
5b96af77 | 2840 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
2841 | |
2842 | if (cb->args[1]) | |
2843 | return skb->len; | |
2844 | ||
e688a7f8 | 2845 | rcu_read_lock(); |
38e029f1 PNA |
2846 | cb->seq = net->nft.base_seq; |
2847 | ||
e688a7f8 | 2848 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
5b96af77 PNA |
2849 | if (ctx->afi && ctx->afi != afi) |
2850 | continue; | |
2851 | ||
c9c8e485 PNA |
2852 | if (cur_family) { |
2853 | if (afi->family != cur_family) | |
2854 | continue; | |
2855 | ||
2856 | cur_family = 0; | |
2857 | } | |
e688a7f8 | 2858 | list_for_each_entry_rcu(table, &afi->tables, list) { |
5b96af77 PNA |
2859 | if (ctx->table && ctx->table != table) |
2860 | continue; | |
2861 | ||
c9c8e485 PNA |
2862 | if (cur_table) { |
2863 | if (cur_table != table) | |
2864 | continue; | |
2865 | ||
2866 | cur_table = NULL; | |
2867 | } | |
c9c8e485 | 2868 | idx = 0; |
5b96af77 | 2869 | list_for_each_entry_rcu(set, &table->sets, list) { |
c9c8e485 PNA |
2870 | if (idx < s_idx) |
2871 | goto cont; | |
37a9cc52 PNA |
2872 | if (!nft_is_active(net, set)) |
2873 | goto cont; | |
5b96af77 PNA |
2874 | |
2875 | ctx_set = *ctx; | |
2876 | ctx_set.table = table; | |
2877 | ctx_set.afi = afi; | |
2878 | if (nf_tables_fill_set(skb, &ctx_set, set, | |
c9c8e485 PNA |
2879 | NFT_MSG_NEWSET, |
2880 | NLM_F_MULTI) < 0) { | |
2881 | cb->args[0] = idx; | |
2882 | cb->args[2] = (unsigned long) table; | |
2883 | cb->args[3] = afi->family; | |
2884 | goto done; | |
2885 | } | |
38e029f1 | 2886 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 PNA |
2887 | cont: |
2888 | idx++; | |
2889 | } | |
2890 | if (s_idx) | |
2891 | s_idx = 0; | |
2892 | } | |
2893 | } | |
2894 | cb->args[1] = 1; | |
2895 | done: | |
e688a7f8 | 2896 | rcu_read_unlock(); |
c9c8e485 PNA |
2897 | return skb->len; |
2898 | } | |
2899 | ||
5b96af77 | 2900 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 2901 | { |
5b96af77 PNA |
2902 | kfree(cb->data); |
2903 | return 0; | |
20a69341 PM |
2904 | } |
2905 | ||
7b8002a1 PNA |
2906 | static int nf_tables_getset(struct net *net, struct sock *nlsk, |
2907 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2908 | const struct nlattr * const nla[], |
2909 | struct netlink_ext_ack *extack) | |
20a69341 | 2910 | { |
f2a6d766 | 2911 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
2912 | const struct nft_set *set; |
2913 | struct nft_ctx ctx; | |
2914 | struct sk_buff *skb2; | |
c9c8e485 | 2915 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2916 | int err; |
2917 | ||
01cfa0a4 | 2918 | /* Verify existence before starting dump */ |
f2a6d766 | 2919 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
2920 | if (err < 0) |
2921 | return err; | |
2922 | ||
2923 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2924 | struct netlink_dump_control c = { | |
2925 | .dump = nf_tables_dump_sets, | |
5b96af77 | 2926 | .done = nf_tables_dump_sets_done, |
20a69341 | 2927 | }; |
5b96af77 PNA |
2928 | struct nft_ctx *ctx_dump; |
2929 | ||
2930 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); | |
2931 | if (ctx_dump == NULL) | |
2932 | return -ENOMEM; | |
2933 | ||
2934 | *ctx_dump = ctx; | |
2935 | c.data = ctx_dump; | |
2936 | ||
20a69341 PM |
2937 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2938 | } | |
2939 | ||
c9c8e485 PNA |
2940 | /* Only accept unspec with dump */ |
2941 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2942 | return -EAFNOSUPPORT; | |
eaa2bcd6 PT |
2943 | if (!nla[NFTA_SET_TABLE]) |
2944 | return -EINVAL; | |
c9c8e485 | 2945 | |
37a9cc52 | 2946 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
2947 | if (IS_ERR(set)) |
2948 | return PTR_ERR(set); | |
2949 | ||
2950 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2951 | if (skb2 == NULL) | |
2952 | return -ENOMEM; | |
2953 | ||
2954 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2955 | if (err < 0) | |
2956 | goto err; | |
2957 | ||
2958 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2959 | ||
2960 | err: | |
2961 | kfree_skb(skb2); | |
2962 | return err; | |
2963 | } | |
2964 | ||
c50b960c PM |
2965 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
2966 | struct nft_set_desc *desc, | |
2967 | const struct nlattr *nla) | |
2968 | { | |
2969 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
2970 | int err; | |
2971 | ||
fceb6435 JB |
2972 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, |
2973 | nft_set_desc_policy, NULL); | |
c50b960c PM |
2974 | if (err < 0) |
2975 | return err; | |
2976 | ||
2977 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
2978 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
2979 | ||
2980 | return 0; | |
2981 | } | |
2982 | ||
633c9a84 PNA |
2983 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
2984 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2985 | const struct nlattr * const nla[], |
2986 | struct netlink_ext_ack *extack) | |
20a69341 PM |
2987 | { |
2988 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2989 | u8 genmask = nft_genmask_next(net); |
20a69341 | 2990 | const struct nft_set_ops *ops; |
7c95f6d8 | 2991 | struct nft_af_info *afi; |
20a69341 PM |
2992 | struct nft_table *table; |
2993 | struct nft_set *set; | |
2994 | struct nft_ctx ctx; | |
38745490 | 2995 | char *name; |
20a69341 PM |
2996 | unsigned int size; |
2997 | bool create; | |
761da293 | 2998 | u64 timeout; |
8aeff920 | 2999 | u32 ktype, dtype, flags, policy, gc_int, objtype; |
c50b960c | 3000 | struct nft_set_desc desc; |
e6d8ecac CFG |
3001 | unsigned char *udata; |
3002 | u16 udlen; | |
20a69341 PM |
3003 | int err; |
3004 | ||
3005 | if (nla[NFTA_SET_TABLE] == NULL || | |
3006 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
3007 | nla[NFTA_SET_KEY_LEN] == NULL || |
3008 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
3009 | return -EINVAL; |
3010 | ||
c50b960c PM |
3011 | memset(&desc, 0, sizeof(desc)); |
3012 | ||
20a69341 PM |
3013 | ktype = NFT_DATA_VALUE; |
3014 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
3015 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
3016 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
3017 | return -EINVAL; | |
3018 | } | |
3019 | ||
c50b960c | 3020 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 3021 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3022 | return -EINVAL; |
3023 | ||
3024 | flags = 0; | |
3025 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
3026 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
3027 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 | 3028 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
8aeff920 PNA |
3029 | NFT_SET_MAP | NFT_SET_EVAL | |
3030 | NFT_SET_OBJECT)) | |
20a69341 | 3031 | return -EINVAL; |
8aeff920 PNA |
3032 | /* Only one of these operations is supported */ |
3033 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) == | |
3034 | (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) | |
7c6c6e95 | 3035 | return -EOPNOTSUPP; |
20a69341 PM |
3036 | } |
3037 | ||
3038 | dtype = 0; | |
20a69341 PM |
3039 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
3040 | if (!(flags & NFT_SET_MAP)) | |
3041 | return -EINVAL; | |
3042 | ||
3043 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
3044 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
3045 | dtype != NFT_DATA_VERDICT) | |
3046 | return -EINVAL; | |
3047 | ||
3048 | if (dtype != NFT_DATA_VERDICT) { | |
3049 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
3050 | return -EINVAL; | |
c50b960c | 3051 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 3052 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3053 | return -EINVAL; |
3054 | } else | |
7d740264 | 3055 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
3056 | } else if (flags & NFT_SET_MAP) |
3057 | return -EINVAL; | |
3058 | ||
8aeff920 PNA |
3059 | if (nla[NFTA_SET_OBJ_TYPE] != NULL) { |
3060 | if (!(flags & NFT_SET_OBJECT)) | |
3061 | return -EINVAL; | |
3062 | ||
3063 | objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); | |
3064 | if (objtype == NFT_OBJECT_UNSPEC || | |
3065 | objtype > NFT_OBJECT_MAX) | |
3066 | return -EINVAL; | |
3067 | } else if (flags & NFT_SET_OBJECT) | |
3068 | return -EINVAL; | |
3069 | else | |
3070 | objtype = NFT_OBJECT_UNSPEC; | |
3071 | ||
761da293 PM |
3072 | timeout = 0; |
3073 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
3074 | if (!(flags & NFT_SET_TIMEOUT)) | |
3075 | return -EINVAL; | |
d3e2a111 AP |
3076 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3077 | nla[NFTA_SET_TIMEOUT]))); | |
761da293 PM |
3078 | } |
3079 | gc_int = 0; | |
3080 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
3081 | if (!(flags & NFT_SET_TIMEOUT)) | |
3082 | return -EINVAL; | |
3083 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
3084 | } | |
3085 | ||
c50b960c PM |
3086 | policy = NFT_SET_POL_PERFORMANCE; |
3087 | if (nla[NFTA_SET_POLICY] != NULL) | |
3088 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
3089 | ||
3090 | if (nla[NFTA_SET_DESC] != NULL) { | |
3091 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
3092 | if (err < 0) | |
3093 | return err; | |
3094 | } | |
3095 | ||
20a69341 PM |
3096 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
3097 | ||
99633ab2 | 3098 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
3099 | if (IS_ERR(afi)) |
3100 | return PTR_ERR(afi); | |
3101 | ||
f2a6d766 | 3102 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask); |
20a69341 PM |
3103 | if (IS_ERR(table)) |
3104 | return PTR_ERR(table); | |
3105 | ||
633c9a84 | 3106 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 | 3107 | |
37a9cc52 | 3108 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3109 | if (IS_ERR(set)) { |
3110 | if (PTR_ERR(set) != -ENOENT) | |
3111 | return PTR_ERR(set); | |
1a28ad74 | 3112 | } else { |
20a69341 PM |
3113 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
3114 | return -EEXIST; | |
3115 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
3116 | return -EOPNOTSUPP; | |
3117 | return 0; | |
3118 | } | |
3119 | ||
3120 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
3121 | return -ENOENT; | |
3122 | ||
2b664957 | 3123 | ops = nft_select_set_ops(&ctx, nla, &desc, policy); |
20a69341 PM |
3124 | if (IS_ERR(ops)) |
3125 | return PTR_ERR(ops); | |
3126 | ||
e6d8ecac CFG |
3127 | udlen = 0; |
3128 | if (nla[NFTA_SET_USERDATA]) | |
3129 | udlen = nla_len(nla[NFTA_SET_USERDATA]); | |
3130 | ||
20a69341 PM |
3131 | size = 0; |
3132 | if (ops->privsize != NULL) | |
347b408d | 3133 | size = ops->privsize(nla, &desc); |
20a69341 | 3134 | |
1ff75a3e PNA |
3135 | set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); |
3136 | if (!set) { | |
3137 | err = -ENOMEM; | |
20a69341 | 3138 | goto err1; |
1ff75a3e | 3139 | } |
20a69341 | 3140 | |
38745490 PS |
3141 | name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL); |
3142 | if (!name) { | |
3143 | err = -ENOMEM; | |
3144 | goto err2; | |
3145 | } | |
3146 | ||
20a69341 | 3147 | err = nf_tables_set_alloc_name(&ctx, set, name); |
38745490 | 3148 | kfree(name); |
20a69341 PM |
3149 | if (err < 0) |
3150 | goto err2; | |
3151 | ||
e6d8ecac CFG |
3152 | udata = NULL; |
3153 | if (udlen) { | |
3154 | udata = set->data + size; | |
3155 | nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); | |
3156 | } | |
3157 | ||
20a69341 PM |
3158 | INIT_LIST_HEAD(&set->bindings); |
3159 | set->ops = ops; | |
3160 | set->ktype = ktype; | |
c50b960c | 3161 | set->klen = desc.klen; |
20a69341 | 3162 | set->dtype = dtype; |
8aeff920 | 3163 | set->objtype = objtype; |
c50b960c | 3164 | set->dlen = desc.dlen; |
20a69341 | 3165 | set->flags = flags; |
c50b960c | 3166 | set->size = desc.size; |
9363dc4b | 3167 | set->policy = policy; |
e6d8ecac CFG |
3168 | set->udlen = udlen; |
3169 | set->udata = udata; | |
761da293 PM |
3170 | set->timeout = timeout; |
3171 | set->gc_int = gc_int; | |
20a69341 | 3172 | |
c50b960c | 3173 | err = ops->init(set, &desc, nla); |
20a69341 PM |
3174 | if (err < 0) |
3175 | goto err2; | |
3176 | ||
958bee14 | 3177 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 | 3178 | if (err < 0) |
c17c3cdf | 3179 | goto err3; |
20a69341 | 3180 | |
e688a7f8 | 3181 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 3182 | table->use++; |
20a69341 PM |
3183 | return 0; |
3184 | ||
c17c3cdf LZ |
3185 | err3: |
3186 | ops->destroy(set); | |
20a69341 | 3187 | err2: |
1ff75a3e | 3188 | kvfree(set); |
20a69341 | 3189 | err1: |
2b664957 | 3190 | module_put(ops->type->owner); |
20a69341 PM |
3191 | return err; |
3192 | } | |
3193 | ||
958bee14 | 3194 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 3195 | { |
20a69341 | 3196 | set->ops->destroy(set); |
2b664957 | 3197 | module_put(set->ops->type->owner); |
38745490 | 3198 | kfree(set->name); |
1ff75a3e | 3199 | kvfree(set); |
20a69341 PM |
3200 | } |
3201 | ||
958bee14 PNA |
3202 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
3203 | { | |
e688a7f8 | 3204 | list_del_rcu(&set->list); |
31f8441c | 3205 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
3206 | nft_set_destroy(set); |
3207 | } | |
3208 | ||
633c9a84 PNA |
3209 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
3210 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3211 | const struct nlattr * const nla[], |
3212 | struct netlink_ext_ack *extack) | |
20a69341 | 3213 | { |
c9c8e485 | 3214 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
f2a6d766 | 3215 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3216 | struct nft_set *set; |
3217 | struct nft_ctx ctx; | |
3218 | int err; | |
3219 | ||
ec2c9935 PM |
3220 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
3221 | return -EAFNOSUPPORT; | |
20a69341 PM |
3222 | if (nla[NFTA_SET_TABLE] == NULL) |
3223 | return -EINVAL; | |
3224 | ||
f2a6d766 | 3225 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3226 | if (err < 0) |
3227 | return err; | |
3228 | ||
37a9cc52 | 3229 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3230 | if (IS_ERR(set)) |
3231 | return PTR_ERR(set); | |
a8278400 PNA |
3232 | |
3233 | if (!list_empty(&set->bindings) || | |
3234 | (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) | |
20a69341 PM |
3235 | return -EBUSY; |
3236 | ||
ee01d542 | 3237 | return nft_delset(&ctx, set); |
20a69341 PM |
3238 | } |
3239 | ||
3240 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 3241 | struct nft_set *set, |
20a69341 | 3242 | const struct nft_set_iter *iter, |
de70185d | 3243 | struct nft_set_elem *elem) |
20a69341 | 3244 | { |
fe2811eb | 3245 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3246 | enum nft_registers dreg; |
3247 | ||
3248 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
3249 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
3250 | set->dtype == NFT_DATA_VERDICT ? | |
3251 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
3252 | set->dlen); | |
20a69341 PM |
3253 | } |
3254 | ||
3255 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3256 | struct nft_set_binding *binding) | |
3257 | { | |
3258 | struct nft_set_binding *i; | |
3259 | struct nft_set_iter iter; | |
3260 | ||
3261 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
3262 | return -EBUSY; | |
3263 | ||
11113e19 | 3264 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
3265 | /* If the set is already bound to the same chain all |
3266 | * jumps are already validated for that chain. | |
3267 | */ | |
3268 | list_for_each_entry(i, &set->bindings, list) { | |
a4684402 | 3269 | if (i->flags & NFT_SET_MAP && |
11113e19 | 3270 | i->chain == binding->chain) |
20a69341 PM |
3271 | goto bind; |
3272 | } | |
3273 | ||
8588ac09 | 3274 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
3275 | iter.skip = 0; |
3276 | iter.count = 0; | |
3277 | iter.err = 0; | |
3278 | iter.fn = nf_tables_bind_check_setelem; | |
3279 | ||
3280 | set->ops->walk(ctx, set, &iter); | |
a02f4248 | 3281 | if (iter.err < 0) |
20a69341 | 3282 | return iter.err; |
20a69341 PM |
3283 | } |
3284 | bind: | |
3285 | binding->chain = ctx->chain; | |
e688a7f8 | 3286 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
3287 | return 0; |
3288 | } | |
63aea290 | 3289 | EXPORT_SYMBOL_GPL(nf_tables_bind_set); |
20a69341 PM |
3290 | |
3291 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3292 | struct nft_set_binding *binding) | |
3293 | { | |
e688a7f8 | 3294 | list_del_rcu(&binding->list); |
20a69341 | 3295 | |
958bee14 | 3296 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
37a9cc52 | 3297 | nft_is_active(ctx->net, set)) |
20a69341 PM |
3298 | nf_tables_set_destroy(ctx, set); |
3299 | } | |
63aea290 | 3300 | EXPORT_SYMBOL_GPL(nf_tables_unbind_set); |
20a69341 | 3301 | |
3ac4c07a PM |
3302 | const struct nft_set_ext_type nft_set_ext_types[] = { |
3303 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 3304 | .align = __alignof__(u32), |
3ac4c07a PM |
3305 | }, |
3306 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 3307 | .align = __alignof__(u32), |
3ac4c07a | 3308 | }, |
f25ad2e9 PM |
3309 | [NFT_SET_EXT_EXPR] = { |
3310 | .align = __alignof__(struct nft_expr), | |
3311 | }, | |
8aeff920 PNA |
3312 | [NFT_SET_EXT_OBJREF] = { |
3313 | .len = sizeof(struct nft_object *), | |
3314 | .align = __alignof__(struct nft_object *), | |
3315 | }, | |
3ac4c07a PM |
3316 | [NFT_SET_EXT_FLAGS] = { |
3317 | .len = sizeof(u8), | |
3318 | .align = __alignof__(u8), | |
3319 | }, | |
c3e1b005 PM |
3320 | [NFT_SET_EXT_TIMEOUT] = { |
3321 | .len = sizeof(u64), | |
3322 | .align = __alignof__(u64), | |
3323 | }, | |
3324 | [NFT_SET_EXT_EXPIRATION] = { | |
3325 | .len = sizeof(unsigned long), | |
3326 | .align = __alignof__(unsigned long), | |
3327 | }, | |
68e942e8 PM |
3328 | [NFT_SET_EXT_USERDATA] = { |
3329 | .len = sizeof(struct nft_userdata), | |
3330 | .align = __alignof__(struct nft_userdata), | |
3331 | }, | |
3ac4c07a PM |
3332 | }; |
3333 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
3334 | ||
20a69341 PM |
3335 | /* |
3336 | * Set elements | |
3337 | */ | |
3338 | ||
3339 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
3340 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
3341 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
3342 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 3343 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
3344 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
3345 | .len = NFT_USERDATA_MAXLEN }, | |
20a69341 PM |
3346 | }; |
3347 | ||
3348 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
b2fbd044 LZ |
3349 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, |
3350 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
3351 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, | |
3352 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
20a69341 | 3353 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
958bee14 | 3354 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
3355 | }; |
3356 | ||
633c9a84 | 3357 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
3358 | const struct sk_buff *skb, |
3359 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
3360 | const struct nlattr * const nla[], |
3361 | u8 genmask) | |
20a69341 PM |
3362 | { |
3363 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
3364 | struct nft_af_info *afi; |
3365 | struct nft_table *table; | |
20a69341 | 3366 | |
99633ab2 | 3367 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
3368 | if (IS_ERR(afi)) |
3369 | return PTR_ERR(afi); | |
3370 | ||
f2a6d766 PNA |
3371 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE], |
3372 | genmask); | |
20a69341 PM |
3373 | if (IS_ERR(table)) |
3374 | return PTR_ERR(table); | |
3375 | ||
633c9a84 | 3376 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
3377 | return 0; |
3378 | } | |
3379 | ||
3380 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
3381 | const struct nft_set *set, | |
3382 | const struct nft_set_elem *elem) | |
3383 | { | |
fe2811eb | 3384 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3385 | unsigned char *b = skb_tail_pointer(skb); |
3386 | struct nlattr *nest; | |
3387 | ||
3388 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
3389 | if (nest == NULL) | |
3390 | goto nla_put_failure; | |
3391 | ||
fe2811eb PM |
3392 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
3393 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
3394 | goto nla_put_failure; |
3395 | ||
fe2811eb PM |
3396 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3397 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
3398 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
3399 | set->dlen) < 0) | |
3400 | goto nla_put_failure; | |
3401 | ||
f25ad2e9 PM |
3402 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3403 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3404 | goto nla_put_failure; | |
3405 | ||
8aeff920 PNA |
3406 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && |
3407 | nla_put_string(skb, NFTA_SET_ELEM_OBJREF, | |
3408 | (*nft_set_ext_obj(ext))->name) < 0) | |
3409 | goto nla_put_failure; | |
3410 | ||
fe2811eb PM |
3411 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3412 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3413 | htonl(*nft_set_ext_flags(ext)))) | |
3414 | goto nla_put_failure; | |
20a69341 | 3415 | |
c3e1b005 PM |
3416 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3417 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
d3e2a111 AP |
3418 | cpu_to_be64(jiffies_to_msecs( |
3419 | *nft_set_ext_timeout(ext))), | |
b46f6ded | 3420 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3421 | goto nla_put_failure; |
3422 | ||
3423 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
3424 | unsigned long expires, now = jiffies; | |
3425 | ||
3426 | expires = *nft_set_ext_expiration(ext); | |
3427 | if (time_before(now, expires)) | |
3428 | expires -= now; | |
3429 | else | |
3430 | expires = 0; | |
3431 | ||
3432 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
b46f6ded ND |
3433 | cpu_to_be64(jiffies_to_msecs(expires)), |
3434 | NFTA_SET_ELEM_PAD)) | |
c3e1b005 PM |
3435 | goto nla_put_failure; |
3436 | } | |
3437 | ||
68e942e8 PM |
3438 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3439 | struct nft_userdata *udata; | |
3440 | ||
3441 | udata = nft_set_ext_userdata(ext); | |
3442 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3443 | udata->len + 1, udata->data)) | |
3444 | goto nla_put_failure; | |
3445 | } | |
3446 | ||
20a69341 PM |
3447 | nla_nest_end(skb, nest); |
3448 | return 0; | |
3449 | ||
3450 | nla_put_failure: | |
3451 | nlmsg_trim(skb, b); | |
3452 | return -EMSGSIZE; | |
3453 | } | |
3454 | ||
3455 | struct nft_set_dump_args { | |
3456 | const struct netlink_callback *cb; | |
3457 | struct nft_set_iter iter; | |
3458 | struct sk_buff *skb; | |
3459 | }; | |
3460 | ||
3461 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
de70185d | 3462 | struct nft_set *set, |
20a69341 | 3463 | const struct nft_set_iter *iter, |
de70185d | 3464 | struct nft_set_elem *elem) |
20a69341 PM |
3465 | { |
3466 | struct nft_set_dump_args *args; | |
3467 | ||
3468 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3469 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3470 | } | |
3471 | ||
fa803605 LZ |
3472 | struct nft_set_dump_ctx { |
3473 | const struct nft_set *set; | |
3474 | struct nft_ctx ctx; | |
3475 | }; | |
3476 | ||
20a69341 PM |
3477 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
3478 | { | |
fa803605 | 3479 | struct nft_set_dump_ctx *dump_ctx = cb->data; |
633c9a84 | 3480 | struct net *net = sock_net(skb->sk); |
fa803605 LZ |
3481 | struct nft_af_info *afi; |
3482 | struct nft_table *table; | |
de70185d | 3483 | struct nft_set *set; |
20a69341 | 3484 | struct nft_set_dump_args args; |
fa803605 | 3485 | bool set_found = false; |
20a69341 PM |
3486 | struct nfgenmsg *nfmsg; |
3487 | struct nlmsghdr *nlh; | |
3488 | struct nlattr *nest; | |
3489 | u32 portid, seq; | |
fa803605 | 3490 | int event; |
20a69341 | 3491 | |
fa803605 LZ |
3492 | rcu_read_lock(); |
3493 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
3494 | if (afi != dump_ctx->ctx.afi) | |
3495 | continue; | |
20a69341 | 3496 | |
fa803605 LZ |
3497 | list_for_each_entry_rcu(table, &afi->tables, list) { |
3498 | if (table != dump_ctx->ctx.table) | |
3499 | continue; | |
20a69341 | 3500 | |
fa803605 LZ |
3501 | list_for_each_entry_rcu(set, &table->sets, list) { |
3502 | if (set == dump_ctx->set) { | |
3503 | set_found = true; | |
3504 | break; | |
3505 | } | |
3506 | } | |
3507 | break; | |
3508 | } | |
3509 | break; | |
3510 | } | |
3511 | ||
3512 | if (!set_found) { | |
3513 | rcu_read_unlock(); | |
3514 | return -ENOENT; | |
3515 | } | |
20a69341 | 3516 | |
dedb67c4 | 3517 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); |
20a69341 PM |
3518 | portid = NETLINK_CB(cb->skb).portid; |
3519 | seq = cb->nlh->nlmsg_seq; | |
3520 | ||
3521 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3522 | NLM_F_MULTI); | |
3523 | if (nlh == NULL) | |
3524 | goto nla_put_failure; | |
3525 | ||
3526 | nfmsg = nlmsg_data(nlh); | |
fa803605 | 3527 | nfmsg->nfgen_family = afi->family; |
20a69341 | 3528 | nfmsg->version = NFNETLINK_V0; |
fa803605 | 3529 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
20a69341 | 3530 | |
fa803605 | 3531 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) |
20a69341 PM |
3532 | goto nla_put_failure; |
3533 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3534 | goto nla_put_failure; | |
3535 | ||
3536 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3537 | if (nest == NULL) | |
3538 | goto nla_put_failure; | |
3539 | ||
8588ac09 PNA |
3540 | args.cb = cb; |
3541 | args.skb = skb; | |
fa803605 | 3542 | args.iter.genmask = nft_genmask_cur(net); |
8588ac09 PNA |
3543 | args.iter.skip = cb->args[0]; |
3544 | args.iter.count = 0; | |
3545 | args.iter.err = 0; | |
3546 | args.iter.fn = nf_tables_dump_setelem; | |
fa803605 LZ |
3547 | set->ops->walk(&dump_ctx->ctx, set, &args.iter); |
3548 | rcu_read_unlock(); | |
20a69341 PM |
3549 | |
3550 | nla_nest_end(skb, nest); | |
3551 | nlmsg_end(skb, nlh); | |
3552 | ||
3553 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3554 | return args.iter.err; | |
3555 | if (args.iter.count == cb->args[0]) | |
3556 | return 0; | |
3557 | ||
3558 | cb->args[0] = args.iter.count; | |
3559 | return skb->len; | |
3560 | ||
3561 | nla_put_failure: | |
fa803605 | 3562 | rcu_read_unlock(); |
20a69341 PM |
3563 | return -ENOSPC; |
3564 | } | |
3565 | ||
fa803605 LZ |
3566 | static int nf_tables_dump_set_done(struct netlink_callback *cb) |
3567 | { | |
3568 | kfree(cb->data); | |
3569 | return 0; | |
3570 | } | |
3571 | ||
7b8002a1 PNA |
3572 | static int nf_tables_getsetelem(struct net *net, struct sock *nlsk, |
3573 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3574 | const struct nlattr * const nla[], |
3575 | struct netlink_ext_ack *extack) | |
20a69341 | 3576 | { |
f2a6d766 | 3577 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
3578 | const struct nft_set *set; |
3579 | struct nft_ctx ctx; | |
3580 | int err; | |
3581 | ||
f2a6d766 | 3582 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3583 | if (err < 0) |
3584 | return err; | |
3585 | ||
37a9cc52 PNA |
3586 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3587 | genmask); | |
20a69341 PM |
3588 | if (IS_ERR(set)) |
3589 | return PTR_ERR(set); | |
3590 | ||
3591 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3592 | struct netlink_dump_control c = { | |
3593 | .dump = nf_tables_dump_set, | |
fa803605 | 3594 | .done = nf_tables_dump_set_done, |
20a69341 | 3595 | }; |
fa803605 LZ |
3596 | struct nft_set_dump_ctx *dump_ctx; |
3597 | ||
3598 | dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL); | |
3599 | if (!dump_ctx) | |
3600 | return -ENOMEM; | |
3601 | ||
3602 | dump_ctx->set = set; | |
3603 | dump_ctx->ctx = ctx; | |
3604 | ||
3605 | c.data = dump_ctx; | |
20a69341 PM |
3606 | return netlink_dump_start(nlsk, skb, nlh, &c); |
3607 | } | |
3608 | return -EOPNOTSUPP; | |
3609 | } | |
3610 | ||
d60ce62f AB |
3611 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
3612 | const struct nft_ctx *ctx, u32 seq, | |
3613 | u32 portid, int event, u16 flags, | |
3614 | const struct nft_set *set, | |
3615 | const struct nft_set_elem *elem) | |
3616 | { | |
3617 | struct nfgenmsg *nfmsg; | |
3618 | struct nlmsghdr *nlh; | |
3619 | struct nlattr *nest; | |
3620 | int err; | |
3621 | ||
dedb67c4 | 3622 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
d60ce62f AB |
3623 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
3624 | flags); | |
3625 | if (nlh == NULL) | |
3626 | goto nla_put_failure; | |
3627 | ||
3628 | nfmsg = nlmsg_data(nlh); | |
3629 | nfmsg->nfgen_family = ctx->afi->family; | |
3630 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 3631 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
3632 | |
3633 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3634 | goto nla_put_failure; | |
3635 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3636 | goto nla_put_failure; | |
3637 | ||
3638 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3639 | if (nest == NULL) | |
3640 | goto nla_put_failure; | |
3641 | ||
3642 | err = nf_tables_fill_setelem(skb, set, elem); | |
3643 | if (err < 0) | |
3644 | goto nla_put_failure; | |
3645 | ||
3646 | nla_nest_end(skb, nest); | |
3647 | ||
053c095a JB |
3648 | nlmsg_end(skb, nlh); |
3649 | return 0; | |
d60ce62f AB |
3650 | |
3651 | nla_put_failure: | |
3652 | nlmsg_trim(skb, nlh); | |
3653 | return -1; | |
3654 | } | |
3655 | ||
25e94a99 PNA |
3656 | static void nf_tables_setelem_notify(const struct nft_ctx *ctx, |
3657 | const struct nft_set *set, | |
3658 | const struct nft_set_elem *elem, | |
3659 | int event, u16 flags) | |
d60ce62f | 3660 | { |
128ad332 PNA |
3661 | struct net *net = ctx->net; |
3662 | u32 portid = ctx->portid; | |
d60ce62f AB |
3663 | struct sk_buff *skb; |
3664 | int err; | |
3665 | ||
128ad332 | 3666 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
25e94a99 | 3667 | return; |
d60ce62f | 3668 | |
d60ce62f AB |
3669 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
3670 | if (skb == NULL) | |
3671 | goto err; | |
3672 | ||
3673 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
3674 | set, elem); | |
3675 | if (err < 0) { | |
3676 | kfree_skb(skb); | |
3677 | goto err; | |
3678 | } | |
3679 | ||
25e94a99 PNA |
3680 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
3681 | GFP_KERNEL); | |
3682 | return; | |
d60ce62f | 3683 | err: |
25e94a99 | 3684 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
d60ce62f AB |
3685 | } |
3686 | ||
60319eb1 PNA |
3687 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
3688 | int msg_type, | |
3689 | struct nft_set *set) | |
3690 | { | |
3691 | struct nft_trans *trans; | |
3692 | ||
3693 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
3694 | if (trans == NULL) | |
3695 | return NULL; | |
3696 | ||
3697 | nft_trans_elem_set(trans) = set; | |
3698 | return trans; | |
3699 | } | |
3700 | ||
22fe54d5 PM |
3701 | void *nft_set_elem_init(const struct nft_set *set, |
3702 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 3703 | const u32 *key, const u32 *data, |
22fe54d5 | 3704 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
3705 | { |
3706 | struct nft_set_ext *ext; | |
3707 | void *elem; | |
3708 | ||
3709 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
3710 | if (elem == NULL) | |
3711 | return NULL; | |
3712 | ||
3713 | ext = nft_set_elem_ext(set, elem); | |
3714 | nft_set_ext_init(ext, tmpl); | |
3715 | ||
3716 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
3717 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3718 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
3719 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
3720 | *nft_set_ext_expiration(ext) = | |
d3e2a111 | 3721 | jiffies + timeout; |
c3e1b005 PM |
3722 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) |
3723 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
3724 | |
3725 | return elem; | |
3726 | } | |
3727 | ||
61f9e292 LZ |
3728 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
3729 | bool destroy_expr) | |
61edafbb PM |
3730 | { |
3731 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3732 | ||
59105446 | 3733 | nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); |
61edafbb | 3734 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) |
59105446 | 3735 | nft_data_release(nft_set_ext_data(ext), set->dtype); |
61f9e292 | 3736 | if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) |
f25ad2e9 | 3737 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); |
8aeff920 PNA |
3738 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) |
3739 | (*nft_set_ext_obj(ext))->use--; | |
61edafbb PM |
3740 | kfree(elem); |
3741 | } | |
3742 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
3743 | ||
59105446 PNA |
3744 | /* Only called from commit path, nft_set_elem_deactivate() already deals with |
3745 | * the refcounting from the preparation phase. | |
3746 | */ | |
3747 | static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem) | |
3748 | { | |
3749 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3750 | ||
3751 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) | |
3752 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); | |
3753 | kfree(elem); | |
3754 | } | |
3755 | ||
0e9091d6 PNA |
3756 | static int nft_setelem_parse_flags(const struct nft_set *set, |
3757 | const struct nlattr *attr, u32 *flags) | |
3758 | { | |
3759 | if (attr == NULL) | |
3760 | return 0; | |
3761 | ||
3762 | *flags = ntohl(nla_get_be32(attr)); | |
3763 | if (*flags & ~NFT_SET_ELEM_INTERVAL_END) | |
3764 | return -EINVAL; | |
3765 | if (!(set->flags & NFT_SET_INTERVAL) && | |
3766 | *flags & NFT_SET_ELEM_INTERVAL_END) | |
3767 | return -EINVAL; | |
3768 | ||
3769 | return 0; | |
3770 | } | |
3771 | ||
60319eb1 | 3772 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
c016c7e4 | 3773 | const struct nlattr *attr, u32 nlmsg_flags) |
20a69341 PM |
3774 | { |
3775 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
8aeff920 | 3776 | u8 genmask = nft_genmask_next(ctx->net); |
20a69341 | 3777 | struct nft_data_desc d1, d2; |
fe2811eb | 3778 | struct nft_set_ext_tmpl tmpl; |
c016c7e4 | 3779 | struct nft_set_ext *ext, *ext2; |
20a69341 PM |
3780 | struct nft_set_elem elem; |
3781 | struct nft_set_binding *binding; | |
8aeff920 | 3782 | struct nft_object *obj = NULL; |
68e942e8 | 3783 | struct nft_userdata *udata; |
fe2811eb | 3784 | struct nft_data data; |
20a69341 | 3785 | enum nft_registers dreg; |
60319eb1 | 3786 | struct nft_trans *trans; |
0e9091d6 | 3787 | u32 flags = 0; |
c3e1b005 | 3788 | u64 timeout; |
68e942e8 | 3789 | u8 ulen; |
20a69341 PM |
3790 | int err; |
3791 | ||
3792 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 3793 | nft_set_elem_policy, NULL); |
20a69341 PM |
3794 | if (err < 0) |
3795 | return err; | |
3796 | ||
3797 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3798 | return -EINVAL; | |
3799 | ||
fe2811eb PM |
3800 | nft_set_ext_prepare(&tmpl); |
3801 | ||
0e9091d6 PNA |
3802 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); |
3803 | if (err < 0) | |
3804 | return err; | |
3805 | if (flags != 0) | |
3806 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
3807 | |
3808 | if (set->flags & NFT_SET_MAP) { | |
3809 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 3810 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 3811 | return -EINVAL; |
bd7fc645 | 3812 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 3813 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 3814 | return -EINVAL; |
20a69341 PM |
3815 | } else { |
3816 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
3817 | return -EINVAL; | |
3818 | } | |
3819 | ||
c3e1b005 PM |
3820 | timeout = 0; |
3821 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
3822 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
3823 | return -EINVAL; | |
d3e2a111 AP |
3824 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3825 | nla[NFTA_SET_ELEM_TIMEOUT]))); | |
c3e1b005 PM |
3826 | } else if (set->flags & NFT_SET_TIMEOUT) { |
3827 | timeout = set->timeout; | |
3828 | } | |
3829 | ||
7d740264 | 3830 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 3831 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3832 | if (err < 0) |
3833 | goto err1; | |
3834 | err = -EINVAL; | |
3835 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
3836 | goto err2; | |
3837 | ||
7d740264 | 3838 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
3839 | if (timeout > 0) { |
3840 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
3841 | if (timeout != set->timeout) | |
3842 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
3843 | } | |
fe2811eb | 3844 | |
8aeff920 PNA |
3845 | if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { |
3846 | if (!(set->flags & NFT_SET_OBJECT)) { | |
3847 | err = -EINVAL; | |
3848 | goto err2; | |
3849 | } | |
3850 | obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF], | |
3851 | set->objtype, genmask); | |
3852 | if (IS_ERR(obj)) { | |
3853 | err = PTR_ERR(obj); | |
3854 | goto err2; | |
3855 | } | |
3856 | nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); | |
3857 | } | |
3858 | ||
20a69341 | 3859 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
3860 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
3861 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
3862 | if (err < 0) |
3863 | goto err2; | |
3864 | ||
3865 | err = -EINVAL; | |
3866 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
3867 | goto err3; | |
3868 | ||
3869 | dreg = nft_type_to_reg(set->dtype); | |
3870 | list_for_each_entry(binding, &set->bindings, list) { | |
3871 | struct nft_ctx bind_ctx = { | |
58c78e10 | 3872 | .net = ctx->net, |
20a69341 PM |
3873 | .afi = ctx->afi, |
3874 | .table = ctx->table, | |
7c95f6d8 | 3875 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
3876 | }; |
3877 | ||
11113e19 PM |
3878 | if (!(binding->flags & NFT_SET_MAP)) |
3879 | continue; | |
3880 | ||
1ec10212 PM |
3881 | err = nft_validate_register_store(&bind_ctx, dreg, |
3882 | &data, | |
3883 | d2.type, d2.len); | |
20a69341 PM |
3884 | if (err < 0) |
3885 | goto err3; | |
3886 | } | |
fe2811eb | 3887 | |
7d740264 | 3888 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
3889 | } |
3890 | ||
68e942e8 PM |
3891 | /* The full maximum length of userdata can exceed the maximum |
3892 | * offset value (U8_MAX) for following extensions, therefor it | |
3893 | * must be the last extension added. | |
3894 | */ | |
3895 | ulen = 0; | |
3896 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
3897 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
3898 | if (ulen > 0) | |
3899 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
3900 | ulen); | |
3901 | } | |
3902 | ||
fe2811eb | 3903 | err = -ENOMEM; |
7d740264 | 3904 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 3905 | timeout, GFP_KERNEL); |
fe2811eb PM |
3906 | if (elem.priv == NULL) |
3907 | goto err3; | |
3908 | ||
3909 | ext = nft_set_elem_ext(set, elem.priv); | |
3910 | if (flags) | |
3911 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
3912 | if (ulen > 0) { |
3913 | udata = nft_set_ext_userdata(ext); | |
3914 | udata->len = ulen - 1; | |
3915 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
3916 | } | |
8aeff920 PNA |
3917 | if (obj) { |
3918 | *nft_set_ext_obj(ext) = obj; | |
3919 | obj->use++; | |
3920 | } | |
fe2811eb | 3921 | |
60319eb1 PNA |
3922 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
3923 | if (trans == NULL) | |
fe2811eb | 3924 | goto err4; |
60319eb1 | 3925 | |
69086658 | 3926 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
c016c7e4 PNA |
3927 | err = set->ops->insert(ctx->net, set, &elem, &ext2); |
3928 | if (err) { | |
3929 | if (err == -EEXIST) { | |
9744a6fc PNA |
3930 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ |
3931 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || | |
3932 | nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ | |
3933 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) | |
3934 | return -EBUSY; | |
8aeff920 PNA |
3935 | if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3936 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && | |
3937 | memcmp(nft_set_ext_data(ext), | |
3938 | nft_set_ext_data(ext2), set->dlen) != 0) || | |
3939 | (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && | |
3940 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && | |
3941 | *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) | |
c016c7e4 PNA |
3942 | err = -EBUSY; |
3943 | else if (!(nlmsg_flags & NLM_F_EXCL)) | |
3944 | err = 0; | |
3945 | } | |
fe2811eb | 3946 | goto err5; |
c016c7e4 | 3947 | } |
20a69341 | 3948 | |
35d0ac90 PNA |
3949 | if (set->size && |
3950 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { | |
3951 | err = -ENFILE; | |
3952 | goto err6; | |
3953 | } | |
3954 | ||
60319eb1 | 3955 | nft_trans_elem(trans) = elem; |
46bbafce | 3956 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
3957 | return 0; |
3958 | ||
35d0ac90 | 3959 | err6: |
5cb82a38 | 3960 | set->ops->remove(ctx->net, set, &elem); |
fe2811eb | 3961 | err5: |
60319eb1 | 3962 | kfree(trans); |
fe2811eb PM |
3963 | err4: |
3964 | kfree(elem.priv); | |
20a69341 PM |
3965 | err3: |
3966 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
59105446 | 3967 | nft_data_release(&data, d2.type); |
20a69341 | 3968 | err2: |
59105446 | 3969 | nft_data_release(&elem.key.val, d1.type); |
20a69341 PM |
3970 | err1: |
3971 | return err; | |
3972 | } | |
3973 | ||
633c9a84 PNA |
3974 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
3975 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3976 | const struct nlattr * const nla[], |
3977 | struct netlink_ext_ack *extack) | |
20a69341 | 3978 | { |
f2a6d766 | 3979 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3980 | const struct nlattr *attr; |
3981 | struct nft_set *set; | |
3982 | struct nft_ctx ctx; | |
60319eb1 | 3983 | int rem, err = 0; |
20a69341 | 3984 | |
7d5570ca PNA |
3985 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
3986 | return -EINVAL; | |
3987 | ||
f2a6d766 | 3988 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3989 | if (err < 0) |
3990 | return err; | |
3991 | ||
37a9cc52 PNA |
3992 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3993 | genmask); | |
958bee14 PNA |
3994 | if (IS_ERR(set)) { |
3995 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { | |
3996 | set = nf_tables_set_lookup_byid(net, | |
37a9cc52 PNA |
3997 | nla[NFTA_SET_ELEM_LIST_SET_ID], |
3998 | genmask); | |
958bee14 PNA |
3999 | } |
4000 | if (IS_ERR(set)) | |
4001 | return PTR_ERR(set); | |
4002 | } | |
4003 | ||
20a69341 PM |
4004 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
4005 | return -EBUSY; | |
4006 | ||
4007 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
c016c7e4 | 4008 | err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags); |
35d0ac90 | 4009 | if (err < 0) |
60319eb1 | 4010 | break; |
20a69341 | 4011 | } |
60319eb1 | 4012 | return err; |
20a69341 PM |
4013 | } |
4014 | ||
59105446 PNA |
4015 | /** |
4016 | * nft_data_hold - hold a nft_data item | |
4017 | * | |
4018 | * @data: struct nft_data to release | |
4019 | * @type: type of data | |
4020 | * | |
4021 | * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
4022 | * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and | |
4023 | * NFT_GOTO verdicts. This function must be called on active data objects | |
4024 | * from the second phase of the commit protocol. | |
4025 | */ | |
4026 | static void nft_data_hold(const struct nft_data *data, enum nft_data_types type) | |
4027 | { | |
4028 | if (type == NFT_DATA_VERDICT) { | |
4029 | switch (data->verdict.code) { | |
4030 | case NFT_JUMP: | |
4031 | case NFT_GOTO: | |
4032 | data->verdict.chain->use++; | |
4033 | break; | |
4034 | } | |
4035 | } | |
4036 | } | |
4037 | ||
4038 | static void nft_set_elem_activate(const struct net *net, | |
4039 | const struct nft_set *set, | |
4040 | struct nft_set_elem *elem) | |
4041 | { | |
4042 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4043 | ||
4044 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4045 | nft_data_hold(nft_set_ext_data(ext), set->dtype); | |
4046 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4047 | (*nft_set_ext_obj(ext))->use++; | |
4048 | } | |
4049 | ||
4050 | static void nft_set_elem_deactivate(const struct net *net, | |
4051 | const struct nft_set *set, | |
4052 | struct nft_set_elem *elem) | |
4053 | { | |
4054 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4055 | ||
4056 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4057 | nft_data_release(nft_set_ext_data(ext), set->dtype); | |
4058 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4059 | (*nft_set_ext_obj(ext))->use--; | |
4060 | } | |
4061 | ||
60319eb1 | 4062 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
4063 | const struct nlattr *attr) |
4064 | { | |
4065 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3971ca14 | 4066 | struct nft_set_ext_tmpl tmpl; |
20a69341 PM |
4067 | struct nft_data_desc desc; |
4068 | struct nft_set_elem elem; | |
3971ca14 | 4069 | struct nft_set_ext *ext; |
60319eb1 | 4070 | struct nft_trans *trans; |
3971ca14 PNA |
4071 | u32 flags = 0; |
4072 | void *priv; | |
20a69341 PM |
4073 | int err; |
4074 | ||
4075 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 4076 | nft_set_elem_policy, NULL); |
20a69341 PM |
4077 | if (err < 0) |
4078 | goto err1; | |
4079 | ||
4080 | err = -EINVAL; | |
4081 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
4082 | goto err1; | |
4083 | ||
3971ca14 PNA |
4084 | nft_set_ext_prepare(&tmpl); |
4085 | ||
4086 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
4087 | if (err < 0) | |
4088 | return err; | |
4089 | if (flags != 0) | |
4090 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
4091 | ||
7d740264 | 4092 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 4093 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
4094 | if (err < 0) |
4095 | goto err1; | |
4096 | ||
4097 | err = -EINVAL; | |
4098 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
4099 | goto err2; | |
4100 | ||
3971ca14 PNA |
4101 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len); |
4102 | ||
4103 | err = -ENOMEM; | |
4104 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0, | |
4105 | GFP_KERNEL); | |
4106 | if (elem.priv == NULL) | |
4107 | goto err2; | |
4108 | ||
4109 | ext = nft_set_elem_ext(set, elem.priv); | |
4110 | if (flags) | |
4111 | *nft_set_ext_flags(ext) = flags; | |
4112 | ||
60319eb1 | 4113 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
4114 | if (trans == NULL) { |
4115 | err = -ENOMEM; | |
3971ca14 | 4116 | goto err3; |
609ccf08 | 4117 | } |
20a69341 | 4118 | |
42a55769 | 4119 | priv = set->ops->deactivate(ctx->net, set, &elem); |
3971ca14 | 4120 | if (priv == NULL) { |
cc02e457 | 4121 | err = -ENOENT; |
3971ca14 | 4122 | goto err4; |
cc02e457 | 4123 | } |
3971ca14 PNA |
4124 | kfree(elem.priv); |
4125 | elem.priv = priv; | |
cc02e457 | 4126 | |
59105446 PNA |
4127 | nft_set_elem_deactivate(ctx->net, set, &elem); |
4128 | ||
60319eb1 | 4129 | nft_trans_elem(trans) = elem; |
46bbafce | 4130 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 4131 | return 0; |
cc02e457 | 4132 | |
3971ca14 | 4133 | err4: |
cc02e457 | 4134 | kfree(trans); |
3971ca14 PNA |
4135 | err3: |
4136 | kfree(elem.priv); | |
20a69341 | 4137 | err2: |
59105446 | 4138 | nft_data_release(&elem.key.val, desc.type); |
20a69341 PM |
4139 | err1: |
4140 | return err; | |
4141 | } | |
4142 | ||
8411b644 | 4143 | static int nft_flush_set(const struct nft_ctx *ctx, |
de70185d | 4144 | struct nft_set *set, |
8411b644 | 4145 | const struct nft_set_iter *iter, |
de70185d | 4146 | struct nft_set_elem *elem) |
8411b644 PNA |
4147 | { |
4148 | struct nft_trans *trans; | |
4149 | int err; | |
4150 | ||
4151 | trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, | |
4152 | sizeof(struct nft_trans_elem), GFP_ATOMIC); | |
4153 | if (!trans) | |
4154 | return -ENOMEM; | |
4155 | ||
1ba1c414 | 4156 | if (!set->ops->flush(ctx->net, set, elem->priv)) { |
8411b644 PNA |
4157 | err = -ENOENT; |
4158 | goto err1; | |
4159 | } | |
b2c11e4b | 4160 | set->ndeact++; |
8411b644 | 4161 | |
de70185d PNA |
4162 | nft_trans_elem_set(trans) = set; |
4163 | nft_trans_elem(trans) = *elem; | |
8411b644 PNA |
4164 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
4165 | ||
4166 | return 0; | |
4167 | err1: | |
4168 | kfree(trans); | |
4169 | return err; | |
4170 | } | |
4171 | ||
633c9a84 PNA |
4172 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
4173 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4174 | const struct nlattr * const nla[], |
4175 | struct netlink_ext_ack *extack) | |
20a69341 | 4176 | { |
f2a6d766 | 4177 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4178 | const struct nlattr *attr; |
4179 | struct nft_set *set; | |
4180 | struct nft_ctx ctx; | |
60319eb1 | 4181 | int rem, err = 0; |
20a69341 | 4182 | |
f2a6d766 | 4183 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
4184 | if (err < 0) |
4185 | return err; | |
4186 | ||
37a9cc52 PNA |
4187 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
4188 | genmask); | |
20a69341 PM |
4189 | if (IS_ERR(set)) |
4190 | return PTR_ERR(set); | |
4191 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
4192 | return -EBUSY; | |
4193 | ||
8411b644 | 4194 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) { |
baa2d42c PNA |
4195 | struct nft_set_iter iter = { |
4196 | .genmask = genmask, | |
4197 | .fn = nft_flush_set, | |
8411b644 | 4198 | }; |
baa2d42c | 4199 | set->ops->walk(&ctx, set, &iter); |
8411b644 | 4200 | |
baa2d42c | 4201 | return iter.err; |
8411b644 PNA |
4202 | } |
4203 | ||
20a69341 PM |
4204 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
4205 | err = nft_del_setelem(&ctx, set, attr); | |
4206 | if (err < 0) | |
60319eb1 | 4207 | break; |
4fefee57 | 4208 | |
3dd0673a | 4209 | set->ndeact++; |
20a69341 | 4210 | } |
60319eb1 | 4211 | return err; |
20a69341 PM |
4212 | } |
4213 | ||
cfed7e1b PM |
4214 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
4215 | { | |
4216 | struct nft_set_gc_batch *gcb; | |
4217 | unsigned int i; | |
4218 | ||
4219 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
4220 | for (i = 0; i < gcb->head.cnt; i++) | |
61f9e292 | 4221 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); |
cfed7e1b PM |
4222 | kfree(gcb); |
4223 | } | |
4224 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
4225 | ||
4226 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
4227 | gfp_t gfp) | |
4228 | { | |
4229 | struct nft_set_gc_batch *gcb; | |
4230 | ||
4231 | gcb = kzalloc(sizeof(*gcb), gfp); | |
4232 | if (gcb == NULL) | |
4233 | return gcb; | |
4234 | gcb->head.set = set; | |
4235 | return gcb; | |
4236 | } | |
4237 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
4238 | ||
e5009240 PNA |
4239 | /* |
4240 | * Stateful objects | |
4241 | */ | |
4242 | ||
4243 | /** | |
4244 | * nft_register_obj- register nf_tables stateful object type | |
4245 | * @obj: object type | |
4246 | * | |
4247 | * Registers the object type for use with nf_tables. Returns zero on | |
4248 | * success or a negative errno code otherwise. | |
4249 | */ | |
4250 | int nft_register_obj(struct nft_object_type *obj_type) | |
4251 | { | |
4252 | if (obj_type->type == NFT_OBJECT_UNSPEC) | |
4253 | return -EINVAL; | |
4254 | ||
4255 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4256 | list_add_rcu(&obj_type->list, &nf_tables_objects); | |
4257 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4258 | return 0; | |
4259 | } | |
4260 | EXPORT_SYMBOL_GPL(nft_register_obj); | |
4261 | ||
4262 | /** | |
4263 | * nft_unregister_obj - unregister nf_tables object type | |
4264 | * @obj: object type | |
4265 | * | |
4266 | * Unregisters the object type for use with nf_tables. | |
4267 | */ | |
4268 | void nft_unregister_obj(struct nft_object_type *obj_type) | |
4269 | { | |
4270 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4271 | list_del_rcu(&obj_type->list); | |
4272 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4273 | } | |
4274 | EXPORT_SYMBOL_GPL(nft_unregister_obj); | |
4275 | ||
4276 | struct nft_object *nf_tables_obj_lookup(const struct nft_table *table, | |
4277 | const struct nlattr *nla, | |
4278 | u32 objtype, u8 genmask) | |
4279 | { | |
4280 | struct nft_object *obj; | |
4281 | ||
4282 | list_for_each_entry(obj, &table->objects, list) { | |
4283 | if (!nla_strcmp(nla, obj->name) && | |
dfc46034 | 4284 | objtype == obj->ops->type->type && |
e5009240 PNA |
4285 | nft_active_genmask(obj, genmask)) |
4286 | return obj; | |
4287 | } | |
4288 | return ERR_PTR(-ENOENT); | |
4289 | } | |
4290 | EXPORT_SYMBOL_GPL(nf_tables_obj_lookup); | |
4291 | ||
4292 | static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { | |
b2fbd044 LZ |
4293 | [NFTA_OBJ_TABLE] = { .type = NLA_STRING, |
4294 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
4295 | [NFTA_OBJ_NAME] = { .type = NLA_STRING, | |
4296 | .len = NFT_OBJ_MAXNAMELEN - 1 }, | |
e5009240 PNA |
4297 | [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, |
4298 | [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, | |
4299 | }; | |
4300 | ||
84fba055 FW |
4301 | static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, |
4302 | const struct nft_object_type *type, | |
e5009240 PNA |
4303 | const struct nlattr *attr) |
4304 | { | |
4305 | struct nlattr *tb[type->maxattr + 1]; | |
dfc46034 | 4306 | const struct nft_object_ops *ops; |
e5009240 PNA |
4307 | struct nft_object *obj; |
4308 | int err; | |
4309 | ||
4310 | if (attr) { | |
fceb6435 JB |
4311 | err = nla_parse_nested(tb, type->maxattr, attr, type->policy, |
4312 | NULL); | |
e5009240 PNA |
4313 | if (err < 0) |
4314 | goto err1; | |
4315 | } else { | |
4316 | memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); | |
4317 | } | |
4318 | ||
dfc46034 PBG |
4319 | if (type->select_ops) { |
4320 | ops = type->select_ops(ctx, (const struct nlattr * const *)tb); | |
4321 | if (IS_ERR(ops)) { | |
4322 | err = PTR_ERR(ops); | |
4323 | goto err1; | |
4324 | } | |
4325 | } else { | |
4326 | ops = type->ops; | |
4327 | } | |
4328 | ||
e5009240 | 4329 | err = -ENOMEM; |
dfc46034 | 4330 | obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL); |
e5009240 PNA |
4331 | if (obj == NULL) |
4332 | goto err1; | |
4333 | ||
dfc46034 | 4334 | err = ops->init(ctx, (const struct nlattr * const *)tb, obj); |
e5009240 PNA |
4335 | if (err < 0) |
4336 | goto err2; | |
4337 | ||
dfc46034 PBG |
4338 | obj->ops = ops; |
4339 | ||
e5009240 PNA |
4340 | return obj; |
4341 | err2: | |
4342 | kfree(obj); | |
4343 | err1: | |
4344 | return ERR_PTR(err); | |
4345 | } | |
4346 | ||
4347 | static int nft_object_dump(struct sk_buff *skb, unsigned int attr, | |
43da04a5 | 4348 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4349 | { |
4350 | struct nlattr *nest; | |
4351 | ||
4352 | nest = nla_nest_start(skb, attr); | |
4353 | if (!nest) | |
4354 | goto nla_put_failure; | |
dfc46034 | 4355 | if (obj->ops->dump(skb, obj, reset) < 0) |
e5009240 PNA |
4356 | goto nla_put_failure; |
4357 | nla_nest_end(skb, nest); | |
4358 | return 0; | |
4359 | ||
4360 | nla_put_failure: | |
4361 | return -1; | |
4362 | } | |
4363 | ||
4364 | static const struct nft_object_type *__nft_obj_type_get(u32 objtype) | |
4365 | { | |
4366 | const struct nft_object_type *type; | |
4367 | ||
4368 | list_for_each_entry(type, &nf_tables_objects, list) { | |
4369 | if (objtype == type->type) | |
4370 | return type; | |
4371 | } | |
4372 | return NULL; | |
4373 | } | |
4374 | ||
4375 | static const struct nft_object_type *nft_obj_type_get(u32 objtype) | |
4376 | { | |
4377 | const struct nft_object_type *type; | |
4378 | ||
4379 | type = __nft_obj_type_get(objtype); | |
4380 | if (type != NULL && try_module_get(type->owner)) | |
4381 | return type; | |
4382 | ||
4383 | #ifdef CONFIG_MODULES | |
4384 | if (type == NULL) { | |
4385 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4386 | request_module("nft-obj-%u", objtype); | |
4387 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4388 | if (__nft_obj_type_get(objtype)) | |
4389 | return ERR_PTR(-EAGAIN); | |
4390 | } | |
4391 | #endif | |
4392 | return ERR_PTR(-ENOENT); | |
4393 | } | |
4394 | ||
4395 | static int nf_tables_newobj(struct net *net, struct sock *nlsk, | |
4396 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4397 | const struct nlattr * const nla[], |
4398 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4399 | { |
4400 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4401 | const struct nft_object_type *type; | |
4402 | u8 genmask = nft_genmask_next(net); | |
4403 | int family = nfmsg->nfgen_family; | |
4404 | struct nft_af_info *afi; | |
4405 | struct nft_table *table; | |
4406 | struct nft_object *obj; | |
4407 | struct nft_ctx ctx; | |
4408 | u32 objtype; | |
4409 | int err; | |
4410 | ||
4411 | if (!nla[NFTA_OBJ_TYPE] || | |
4412 | !nla[NFTA_OBJ_NAME] || | |
4413 | !nla[NFTA_OBJ_DATA]) | |
4414 | return -EINVAL; | |
4415 | ||
4416 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4417 | if (IS_ERR(afi)) | |
4418 | return PTR_ERR(afi); | |
4419 | ||
4420 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4421 | if (IS_ERR(table)) | |
4422 | return PTR_ERR(table); | |
4423 | ||
4424 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4425 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4426 | if (IS_ERR(obj)) { | |
4427 | err = PTR_ERR(obj); | |
4428 | if (err != -ENOENT) | |
4429 | return err; | |
4430 | ||
1a28ad74 | 4431 | } else { |
e5009240 PNA |
4432 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
4433 | return -EEXIST; | |
4434 | ||
4435 | return 0; | |
4436 | } | |
4437 | ||
4438 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4439 | ||
4440 | type = nft_obj_type_get(objtype); | |
4441 | if (IS_ERR(type)) | |
4442 | return PTR_ERR(type); | |
4443 | ||
84fba055 | 4444 | obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); |
e5009240 PNA |
4445 | if (IS_ERR(obj)) { |
4446 | err = PTR_ERR(obj); | |
4447 | goto err1; | |
4448 | } | |
18965317 | 4449 | obj->table = table; |
61509575 PS |
4450 | obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL); |
4451 | if (!obj->name) { | |
4452 | err = -ENOMEM; | |
4453 | goto err2; | |
4454 | } | |
e5009240 PNA |
4455 | |
4456 | err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); | |
4457 | if (err < 0) | |
61509575 | 4458 | goto err3; |
e5009240 PNA |
4459 | |
4460 | list_add_tail_rcu(&obj->list, &table->objects); | |
4461 | table->use++; | |
4462 | return 0; | |
61509575 PS |
4463 | err3: |
4464 | kfree(obj->name); | |
e5009240 | 4465 | err2: |
dfc46034 PBG |
4466 | if (obj->ops->destroy) |
4467 | obj->ops->destroy(obj); | |
e5009240 PNA |
4468 | kfree(obj); |
4469 | err1: | |
4470 | module_put(type->owner); | |
4471 | return err; | |
4472 | } | |
4473 | ||
4474 | static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, | |
4475 | u32 portid, u32 seq, int event, u32 flags, | |
4476 | int family, const struct nft_table *table, | |
43da04a5 | 4477 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4478 | { |
4479 | struct nfgenmsg *nfmsg; | |
4480 | struct nlmsghdr *nlh; | |
4481 | ||
dedb67c4 | 4482 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
e5009240 PNA |
4483 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
4484 | if (nlh == NULL) | |
4485 | goto nla_put_failure; | |
4486 | ||
4487 | nfmsg = nlmsg_data(nlh); | |
4488 | nfmsg->nfgen_family = family; | |
4489 | nfmsg->version = NFNETLINK_V0; | |
4490 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4491 | ||
4492 | if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || | |
4493 | nla_put_string(skb, NFTA_OBJ_NAME, obj->name) || | |
dfc46034 | 4494 | nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) || |
e5009240 | 4495 | nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || |
43da04a5 | 4496 | nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset)) |
e5009240 PNA |
4497 | goto nla_put_failure; |
4498 | ||
4499 | nlmsg_end(skb, nlh); | |
4500 | return 0; | |
4501 | ||
4502 | nla_put_failure: | |
4503 | nlmsg_trim(skb, nlh); | |
4504 | return -1; | |
4505 | } | |
4506 | ||
a9fea2a3 | 4507 | struct nft_obj_filter { |
e46abbcc | 4508 | char *table; |
a9fea2a3 PNA |
4509 | u32 type; |
4510 | }; | |
4511 | ||
e5009240 PNA |
4512 | static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) |
4513 | { | |
4514 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
4515 | const struct nft_af_info *afi; | |
4516 | const struct nft_table *table; | |
e5009240 | 4517 | unsigned int idx = 0, s_idx = cb->args[0]; |
a9fea2a3 | 4518 | struct nft_obj_filter *filter = cb->data; |
e5009240 PNA |
4519 | struct net *net = sock_net(skb->sk); |
4520 | int family = nfmsg->nfgen_family; | |
43da04a5 PNA |
4521 | struct nft_object *obj; |
4522 | bool reset = false; | |
4523 | ||
4524 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) | |
4525 | reset = true; | |
e5009240 PNA |
4526 | |
4527 | rcu_read_lock(); | |
4528 | cb->seq = net->nft.base_seq; | |
4529 | ||
4530 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
4531 | if (family != NFPROTO_UNSPEC && family != afi->family) | |
4532 | continue; | |
4533 | ||
4534 | list_for_each_entry_rcu(table, &afi->tables, list) { | |
4535 | list_for_each_entry_rcu(obj, &table->objects, list) { | |
4536 | if (!nft_is_active(net, obj)) | |
4537 | goto cont; | |
4538 | if (idx < s_idx) | |
4539 | goto cont; | |
4540 | if (idx > s_idx) | |
4541 | memset(&cb->args[1], 0, | |
4542 | sizeof(cb->args) - sizeof(cb->args[0])); | |
d21e540b | 4543 | if (filter && filter->table[0] && |
a9fea2a3 PNA |
4544 | strcmp(filter->table, table->name)) |
4545 | goto cont; | |
d21e540b LZ |
4546 | if (filter && |
4547 | filter->type != NFT_OBJECT_UNSPEC && | |
dfc46034 | 4548 | obj->ops->type->type != filter->type) |
a9fea2a3 PNA |
4549 | goto cont; |
4550 | ||
e5009240 PNA |
4551 | if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, |
4552 | cb->nlh->nlmsg_seq, | |
4553 | NFT_MSG_NEWOBJ, | |
4554 | NLM_F_MULTI | NLM_F_APPEND, | |
43da04a5 | 4555 | afi->family, table, obj, reset) < 0) |
e5009240 PNA |
4556 | goto done; |
4557 | ||
4558 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
4559 | cont: | |
4560 | idx++; | |
4561 | } | |
4562 | } | |
4563 | } | |
4564 | done: | |
4565 | rcu_read_unlock(); | |
4566 | ||
4567 | cb->args[0] = idx; | |
4568 | return skb->len; | |
4569 | } | |
4570 | ||
a9fea2a3 PNA |
4571 | static int nf_tables_dump_obj_done(struct netlink_callback *cb) |
4572 | { | |
e46abbcc PS |
4573 | struct nft_obj_filter *filter = cb->data; |
4574 | ||
4575 | kfree(filter->table); | |
4576 | kfree(filter); | |
a9fea2a3 PNA |
4577 | |
4578 | return 0; | |
4579 | } | |
4580 | ||
4581 | static struct nft_obj_filter * | |
4582 | nft_obj_filter_alloc(const struct nlattr * const nla[]) | |
4583 | { | |
4584 | struct nft_obj_filter *filter; | |
4585 | ||
4586 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); | |
4587 | if (!filter) | |
4588 | return ERR_PTR(-ENOMEM); | |
4589 | ||
e46abbcc PS |
4590 | if (nla[NFTA_OBJ_TABLE]) { |
4591 | filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL); | |
4592 | if (!filter->table) { | |
4593 | kfree(filter); | |
4594 | return ERR_PTR(-ENOMEM); | |
4595 | } | |
4596 | } | |
a9fea2a3 PNA |
4597 | if (nla[NFTA_OBJ_TYPE]) |
4598 | filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4599 | ||
4600 | return filter; | |
4601 | } | |
4602 | ||
e5009240 PNA |
4603 | static int nf_tables_getobj(struct net *net, struct sock *nlsk, |
4604 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4605 | const struct nlattr * const nla[], |
4606 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4607 | { |
4608 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4609 | u8 genmask = nft_genmask_cur(net); | |
4610 | int family = nfmsg->nfgen_family; | |
4611 | const struct nft_af_info *afi; | |
4612 | const struct nft_table *table; | |
4613 | struct nft_object *obj; | |
4614 | struct sk_buff *skb2; | |
43da04a5 | 4615 | bool reset = false; |
e5009240 PNA |
4616 | u32 objtype; |
4617 | int err; | |
4618 | ||
4619 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
4620 | struct netlink_dump_control c = { | |
4621 | .dump = nf_tables_dump_obj, | |
a9fea2a3 | 4622 | .done = nf_tables_dump_obj_done, |
e5009240 | 4623 | }; |
a9fea2a3 PNA |
4624 | |
4625 | if (nla[NFTA_OBJ_TABLE] || | |
4626 | nla[NFTA_OBJ_TYPE]) { | |
4627 | struct nft_obj_filter *filter; | |
4628 | ||
4629 | filter = nft_obj_filter_alloc(nla); | |
4630 | if (IS_ERR(filter)) | |
4631 | return -ENOMEM; | |
4632 | ||
4633 | c.data = filter; | |
4634 | } | |
e5009240 PNA |
4635 | return netlink_dump_start(nlsk, skb, nlh, &c); |
4636 | } | |
4637 | ||
4638 | if (!nla[NFTA_OBJ_NAME] || | |
4639 | !nla[NFTA_OBJ_TYPE]) | |
4640 | return -EINVAL; | |
4641 | ||
4642 | afi = nf_tables_afinfo_lookup(net, family, false); | |
4643 | if (IS_ERR(afi)) | |
4644 | return PTR_ERR(afi); | |
4645 | ||
4646 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4647 | if (IS_ERR(table)) | |
4648 | return PTR_ERR(table); | |
4649 | ||
4650 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4651 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4652 | if (IS_ERR(obj)) | |
4653 | return PTR_ERR(obj); | |
4654 | ||
4655 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4656 | if (!skb2) | |
4657 | return -ENOMEM; | |
4658 | ||
43da04a5 PNA |
4659 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) |
4660 | reset = true; | |
4661 | ||
e5009240 PNA |
4662 | err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, |
4663 | nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, | |
43da04a5 | 4664 | family, table, obj, reset); |
e5009240 PNA |
4665 | if (err < 0) |
4666 | goto err; | |
4667 | ||
4668 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4669 | err: | |
4670 | kfree_skb(skb2); | |
4671 | return err; | |
e5009240 PNA |
4672 | } |
4673 | ||
4674 | static void nft_obj_destroy(struct nft_object *obj) | |
4675 | { | |
dfc46034 PBG |
4676 | if (obj->ops->destroy) |
4677 | obj->ops->destroy(obj); | |
e5009240 | 4678 | |
dfc46034 | 4679 | module_put(obj->ops->type->owner); |
61509575 | 4680 | kfree(obj->name); |
e5009240 PNA |
4681 | kfree(obj); |
4682 | } | |
4683 | ||
4684 | static int nf_tables_delobj(struct net *net, struct sock *nlsk, | |
04ba724b PNA |
4685 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
4686 | const struct nlattr * const nla[], | |
4687 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4688 | { |
4689 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4690 | u8 genmask = nft_genmask_next(net); | |
4691 | int family = nfmsg->nfgen_family; | |
4692 | struct nft_af_info *afi; | |
4693 | struct nft_table *table; | |
4694 | struct nft_object *obj; | |
4695 | struct nft_ctx ctx; | |
4696 | u32 objtype; | |
4697 | ||
4698 | if (!nla[NFTA_OBJ_TYPE] || | |
4699 | !nla[NFTA_OBJ_NAME]) | |
4700 | return -EINVAL; | |
4701 | ||
4702 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4703 | if (IS_ERR(afi)) | |
4704 | return PTR_ERR(afi); | |
4705 | ||
4706 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4707 | if (IS_ERR(table)) | |
4708 | return PTR_ERR(table); | |
4709 | ||
4710 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4711 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4712 | if (IS_ERR(obj)) | |
4713 | return PTR_ERR(obj); | |
4714 | if (obj->use > 0) | |
4715 | return -EBUSY; | |
4716 | ||
4717 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4718 | ||
4719 | return nft_delobj(&ctx, obj); | |
4720 | } | |
4721 | ||
25e94a99 PNA |
4722 | void nft_obj_notify(struct net *net, struct nft_table *table, |
4723 | struct nft_object *obj, u32 portid, u32 seq, int event, | |
4724 | int family, int report, gfp_t gfp) | |
e5009240 PNA |
4725 | { |
4726 | struct sk_buff *skb; | |
4727 | int err; | |
4728 | ||
2599e989 PNA |
4729 | if (!report && |
4730 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 4731 | return; |
e5009240 | 4732 | |
2599e989 | 4733 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp); |
e5009240 PNA |
4734 | if (skb == NULL) |
4735 | goto err; | |
4736 | ||
2599e989 PNA |
4737 | err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family, |
4738 | table, obj, false); | |
e5009240 PNA |
4739 | if (err < 0) { |
4740 | kfree_skb(skb); | |
4741 | goto err; | |
4742 | } | |
4743 | ||
25e94a99 PNA |
4744 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp); |
4745 | return; | |
e5009240 | 4746 | err: |
25e94a99 | 4747 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
e5009240 | 4748 | } |
2599e989 PNA |
4749 | EXPORT_SYMBOL_GPL(nft_obj_notify); |
4750 | ||
25e94a99 PNA |
4751 | static void nf_tables_obj_notify(const struct nft_ctx *ctx, |
4752 | struct nft_object *obj, int event) | |
2599e989 | 4753 | { |
25e94a99 PNA |
4754 | nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, |
4755 | ctx->afi->family, ctx->report, GFP_KERNEL); | |
2599e989 | 4756 | } |
e5009240 | 4757 | |
84d7fce6 PNA |
4758 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
4759 | u32 portid, u32 seq) | |
4760 | { | |
4761 | struct nlmsghdr *nlh; | |
4762 | struct nfgenmsg *nfmsg; | |
784b4e61 | 4763 | char buf[TASK_COMM_LEN]; |
dedb67c4 | 4764 | int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); |
84d7fce6 PNA |
4765 | |
4766 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
4767 | if (nlh == NULL) | |
4768 | goto nla_put_failure; | |
4769 | ||
4770 | nfmsg = nlmsg_data(nlh); | |
4771 | nfmsg->nfgen_family = AF_UNSPEC; | |
4772 | nfmsg->version = NFNETLINK_V0; | |
4773 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4774 | ||
784b4e61 PS |
4775 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) || |
4776 | nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) || | |
4777 | nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current))) | |
84d7fce6 PNA |
4778 | goto nla_put_failure; |
4779 | ||
053c095a JB |
4780 | nlmsg_end(skb, nlh); |
4781 | return 0; | |
84d7fce6 PNA |
4782 | |
4783 | nla_put_failure: | |
4784 | nlmsg_trim(skb, nlh); | |
4785 | return -EMSGSIZE; | |
4786 | } | |
4787 | ||
25e94a99 PNA |
4788 | static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, |
4789 | int event) | |
84d7fce6 PNA |
4790 | { |
4791 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
4792 | struct sk_buff *skb2; | |
4793 | int err; | |
4794 | ||
4795 | if (nlmsg_report(nlh) && | |
4796 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 4797 | return; |
84d7fce6 | 4798 | |
84d7fce6 PNA |
4799 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
4800 | if (skb2 == NULL) | |
4801 | goto err; | |
4802 | ||
4803 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
4804 | nlh->nlmsg_seq); | |
4805 | if (err < 0) { | |
4806 | kfree_skb(skb2); | |
4807 | goto err; | |
4808 | } | |
4809 | ||
25e94a99 PNA |
4810 | nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
4811 | nlmsg_report(nlh), GFP_KERNEL); | |
4812 | return; | |
84d7fce6 | 4813 | err: |
25e94a99 PNA |
4814 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
4815 | -ENOBUFS); | |
84d7fce6 PNA |
4816 | } |
4817 | ||
7b8002a1 PNA |
4818 | static int nf_tables_getgen(struct net *net, struct sock *nlsk, |
4819 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4820 | const struct nlattr * const nla[], |
4821 | struct netlink_ext_ack *extack) | |
84d7fce6 | 4822 | { |
84d7fce6 PNA |
4823 | struct sk_buff *skb2; |
4824 | int err; | |
4825 | ||
4826 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4827 | if (skb2 == NULL) | |
4828 | return -ENOMEM; | |
4829 | ||
4830 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
4831 | nlh->nlmsg_seq); | |
4832 | if (err < 0) | |
4833 | goto err; | |
4834 | ||
4835 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4836 | err: | |
4837 | kfree_skb(skb2); | |
4838 | return err; | |
4839 | } | |
4840 | ||
96518518 PM |
4841 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
4842 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 4843 | .call_batch = nf_tables_newtable, |
96518518 PM |
4844 | .attr_count = NFTA_TABLE_MAX, |
4845 | .policy = nft_table_policy, | |
4846 | }, | |
4847 | [NFT_MSG_GETTABLE] = { | |
4848 | .call = nf_tables_gettable, | |
4849 | .attr_count = NFTA_TABLE_MAX, | |
4850 | .policy = nft_table_policy, | |
4851 | }, | |
4852 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 4853 | .call_batch = nf_tables_deltable, |
96518518 PM |
4854 | .attr_count = NFTA_TABLE_MAX, |
4855 | .policy = nft_table_policy, | |
4856 | }, | |
4857 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 4858 | .call_batch = nf_tables_newchain, |
96518518 PM |
4859 | .attr_count = NFTA_CHAIN_MAX, |
4860 | .policy = nft_chain_policy, | |
4861 | }, | |
4862 | [NFT_MSG_GETCHAIN] = { | |
4863 | .call = nf_tables_getchain, | |
4864 | .attr_count = NFTA_CHAIN_MAX, | |
4865 | .policy = nft_chain_policy, | |
4866 | }, | |
4867 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 4868 | .call_batch = nf_tables_delchain, |
96518518 PM |
4869 | .attr_count = NFTA_CHAIN_MAX, |
4870 | .policy = nft_chain_policy, | |
4871 | }, | |
4872 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 4873 | .call_batch = nf_tables_newrule, |
96518518 PM |
4874 | .attr_count = NFTA_RULE_MAX, |
4875 | .policy = nft_rule_policy, | |
4876 | }, | |
4877 | [NFT_MSG_GETRULE] = { | |
4878 | .call = nf_tables_getrule, | |
4879 | .attr_count = NFTA_RULE_MAX, | |
4880 | .policy = nft_rule_policy, | |
4881 | }, | |
4882 | [NFT_MSG_DELRULE] = { | |
0628b123 | 4883 | .call_batch = nf_tables_delrule, |
96518518 PM |
4884 | .attr_count = NFTA_RULE_MAX, |
4885 | .policy = nft_rule_policy, | |
4886 | }, | |
20a69341 | 4887 | [NFT_MSG_NEWSET] = { |
958bee14 | 4888 | .call_batch = nf_tables_newset, |
20a69341 PM |
4889 | .attr_count = NFTA_SET_MAX, |
4890 | .policy = nft_set_policy, | |
4891 | }, | |
4892 | [NFT_MSG_GETSET] = { | |
4893 | .call = nf_tables_getset, | |
4894 | .attr_count = NFTA_SET_MAX, | |
4895 | .policy = nft_set_policy, | |
4896 | }, | |
4897 | [NFT_MSG_DELSET] = { | |
958bee14 | 4898 | .call_batch = nf_tables_delset, |
20a69341 PM |
4899 | .attr_count = NFTA_SET_MAX, |
4900 | .policy = nft_set_policy, | |
4901 | }, | |
4902 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 4903 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
4904 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
4905 | .policy = nft_set_elem_list_policy, | |
4906 | }, | |
4907 | [NFT_MSG_GETSETELEM] = { | |
4908 | .call = nf_tables_getsetelem, | |
4909 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
4910 | .policy = nft_set_elem_list_policy, | |
4911 | }, | |
4912 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 4913 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
4914 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
4915 | .policy = nft_set_elem_list_policy, | |
4916 | }, | |
84d7fce6 PNA |
4917 | [NFT_MSG_GETGEN] = { |
4918 | .call = nf_tables_getgen, | |
4919 | }, | |
e5009240 PNA |
4920 | [NFT_MSG_NEWOBJ] = { |
4921 | .call_batch = nf_tables_newobj, | |
4922 | .attr_count = NFTA_OBJ_MAX, | |
4923 | .policy = nft_obj_policy, | |
4924 | }, | |
4925 | [NFT_MSG_GETOBJ] = { | |
4926 | .call = nf_tables_getobj, | |
4927 | .attr_count = NFTA_OBJ_MAX, | |
4928 | .policy = nft_obj_policy, | |
4929 | }, | |
4930 | [NFT_MSG_DELOBJ] = { | |
4931 | .call_batch = nf_tables_delobj, | |
4932 | .attr_count = NFTA_OBJ_MAX, | |
4933 | .policy = nft_obj_policy, | |
4934 | }, | |
43da04a5 PNA |
4935 | [NFT_MSG_GETOBJ_RESET] = { |
4936 | .call = nf_tables_getobj, | |
4937 | .attr_count = NFTA_OBJ_MAX, | |
4938 | .policy = nft_obj_policy, | |
4939 | }, | |
96518518 PM |
4940 | }; |
4941 | ||
91c7b38d PNA |
4942 | static void nft_chain_commit_update(struct nft_trans *trans) |
4943 | { | |
4944 | struct nft_base_chain *basechain; | |
4945 | ||
b7263e07 | 4946 | if (nft_trans_chain_name(trans)) |
91c7b38d PNA |
4947 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); |
4948 | ||
f323d954 | 4949 | if (!nft_is_base_chain(trans->ctx.chain)) |
91c7b38d PNA |
4950 | return; |
4951 | ||
4952 | basechain = nft_base_chain(trans->ctx.chain); | |
4953 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
4954 | ||
4955 | switch (nft_trans_chain_policy(trans)) { | |
4956 | case NF_DROP: | |
4957 | case NF_ACCEPT: | |
4958 | basechain->policy = nft_trans_chain_policy(trans); | |
4959 | break; | |
4960 | } | |
4961 | } | |
4962 | ||
b326dd37 | 4963 | static void nf_tables_commit_release(struct nft_trans *trans) |
c7c32e72 | 4964 | { |
c7c32e72 PNA |
4965 | switch (trans->msg_type) { |
4966 | case NFT_MSG_DELTABLE: | |
4967 | nf_tables_table_destroy(&trans->ctx); | |
4968 | break; | |
4969 | case NFT_MSG_DELCHAIN: | |
4970 | nf_tables_chain_destroy(trans->ctx.chain); | |
4971 | break; | |
4972 | case NFT_MSG_DELRULE: | |
4973 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
4974 | break; | |
4975 | case NFT_MSG_DELSET: | |
4976 | nft_set_destroy(nft_trans_set(trans)); | |
4977 | break; | |
61edafbb | 4978 | case NFT_MSG_DELSETELEM: |
59105446 PNA |
4979 | nf_tables_set_elem_destroy(nft_trans_elem_set(trans), |
4980 | nft_trans_elem(trans).priv); | |
61edafbb | 4981 | break; |
e5009240 PNA |
4982 | case NFT_MSG_DELOBJ: |
4983 | nft_obj_destroy(nft_trans_obj(trans)); | |
4984 | break; | |
c7c32e72 PNA |
4985 | } |
4986 | kfree(trans); | |
4987 | } | |
4988 | ||
5913beaf | 4989 | static int nf_tables_commit(struct net *net, struct sk_buff *skb) |
37082f93 | 4990 | { |
37082f93 | 4991 | struct nft_trans *trans, *next; |
a3716e70 | 4992 | struct nft_trans_elem *te; |
37082f93 PNA |
4993 | |
4994 | /* Bump generation counter, invalidate any dump in progress */ | |
38e029f1 | 4995 | while (++net->nft.base_seq == 0); |
37082f93 PNA |
4996 | |
4997 | /* A new generation has just started */ | |
ea4bd995 | 4998 | net->nft.gencursor = nft_gencursor_next(net); |
37082f93 PNA |
4999 | |
5000 | /* Make sure all packets have left the previous generation before | |
5001 | * purging old rules. | |
5002 | */ | |
5003 | synchronize_rcu(); | |
5004 | ||
5005 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 5006 | switch (trans->msg_type) { |
55dd6f93 PNA |
5007 | case NFT_MSG_NEWTABLE: |
5008 | if (nft_trans_table_update(trans)) { | |
5009 | if (!nft_trans_table_enable(trans)) { | |
664b0f8c PNA |
5010 | nf_tables_table_disable(net, |
5011 | trans->ctx.afi, | |
55dd6f93 PNA |
5012 | trans->ctx.table); |
5013 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
5014 | } | |
5015 | } else { | |
f2a6d766 | 5016 | nft_clear(net, trans->ctx.table); |
55dd6f93 | 5017 | } |
35151d84 | 5018 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
5019 | nft_trans_destroy(trans); |
5020 | break; | |
5021 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 5022 | list_del_rcu(&trans->ctx.table->list); |
35151d84 | 5023 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 5024 | break; |
91c7b38d PNA |
5025 | case NFT_MSG_NEWCHAIN: |
5026 | if (nft_trans_chain_update(trans)) | |
5027 | nft_chain_commit_update(trans); | |
4fefee57 | 5028 | else |
664b0f8c | 5029 | nft_clear(net, trans->ctx.chain); |
4fefee57 | 5030 | |
35151d84 | 5031 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
5032 | nft_trans_destroy(trans); |
5033 | break; | |
5034 | case NFT_MSG_DELCHAIN: | |
664b0f8c | 5035 | list_del_rcu(&trans->ctx.chain->list); |
35151d84 | 5036 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
82bec71d PNA |
5037 | nf_tables_unregister_hooks(trans->ctx.net, |
5038 | trans->ctx.table, | |
c5598794 AB |
5039 | trans->ctx.chain, |
5040 | trans->ctx.afi->nops); | |
91c7b38d | 5041 | break; |
b380e5c7 | 5042 | case NFT_MSG_NEWRULE: |
889f7ee7 | 5043 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
35151d84 | 5044 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 5045 | nft_trans_rule(trans), |
35151d84 | 5046 | NFT_MSG_NEWRULE); |
37082f93 | 5047 | nft_trans_destroy(trans); |
b380e5c7 PNA |
5048 | break; |
5049 | case NFT_MSG_DELRULE: | |
5050 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
5051 | nf_tables_rule_notify(&trans->ctx, |
5052 | nft_trans_rule(trans), | |
5053 | NFT_MSG_DELRULE); | |
b380e5c7 | 5054 | break; |
958bee14 | 5055 | case NFT_MSG_NEWSET: |
37a9cc52 | 5056 | nft_clear(net, nft_trans_set(trans)); |
4fefee57 PNA |
5057 | /* This avoids hitting -EBUSY when deleting the table |
5058 | * from the transaction. | |
5059 | */ | |
5060 | if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS && | |
5061 | !list_empty(&nft_trans_set(trans)->bindings)) | |
5062 | trans->ctx.table->use--; | |
5063 | ||
958bee14 | 5064 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 5065 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
5066 | nft_trans_destroy(trans); |
5067 | break; | |
5068 | case NFT_MSG_DELSET: | |
37a9cc52 | 5069 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 | 5070 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 5071 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 5072 | break; |
60319eb1 | 5073 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
5074 | te = (struct nft_trans_elem *)trans->data; |
5075 | ||
42a55769 | 5076 | te->set->ops->activate(net, te->set, &te->elem); |
cc02e457 PM |
5077 | nf_tables_setelem_notify(&trans->ctx, te->set, |
5078 | &te->elem, | |
60319eb1 PNA |
5079 | NFT_MSG_NEWSETELEM, 0); |
5080 | nft_trans_destroy(trans); | |
5081 | break; | |
5082 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 5083 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 5084 | |
a3716e70 PNA |
5085 | nf_tables_setelem_notify(&trans->ctx, te->set, |
5086 | &te->elem, | |
60319eb1 | 5087 | NFT_MSG_DELSETELEM, 0); |
5cb82a38 | 5088 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a PM |
5089 | atomic_dec(&te->set->nelems); |
5090 | te->set->ndeact--; | |
60319eb1 | 5091 | break; |
e5009240 PNA |
5092 | case NFT_MSG_NEWOBJ: |
5093 | nft_clear(net, nft_trans_obj(trans)); | |
5094 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
5095 | NFT_MSG_NEWOBJ); | |
5096 | nft_trans_destroy(trans); | |
5097 | break; | |
5098 | case NFT_MSG_DELOBJ: | |
5099 | list_del_rcu(&nft_trans_obj(trans)->list); | |
5100 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
5101 | NFT_MSG_DELOBJ); | |
5102 | break; | |
37082f93 | 5103 | } |
37082f93 PNA |
5104 | } |
5105 | ||
b326dd37 PNA |
5106 | synchronize_rcu(); |
5107 | ||
37082f93 | 5108 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 | 5109 | list_del(&trans->list); |
b326dd37 | 5110 | nf_tables_commit_release(trans); |
37082f93 | 5111 | } |
84d7fce6 PNA |
5112 | |
5113 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); | |
37082f93 PNA |
5114 | |
5115 | return 0; | |
5116 | } | |
5117 | ||
b326dd37 | 5118 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 5119 | { |
c7c32e72 PNA |
5120 | switch (trans->msg_type) { |
5121 | case NFT_MSG_NEWTABLE: | |
5122 | nf_tables_table_destroy(&trans->ctx); | |
5123 | break; | |
5124 | case NFT_MSG_NEWCHAIN: | |
5125 | nf_tables_chain_destroy(trans->ctx.chain); | |
5126 | break; | |
5127 | case NFT_MSG_NEWRULE: | |
5128 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
5129 | break; | |
5130 | case NFT_MSG_NEWSET: | |
5131 | nft_set_destroy(nft_trans_set(trans)); | |
5132 | break; | |
61edafbb PM |
5133 | case NFT_MSG_NEWSETELEM: |
5134 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 5135 | nft_trans_elem(trans).priv, true); |
61edafbb | 5136 | break; |
e5009240 PNA |
5137 | case NFT_MSG_NEWOBJ: |
5138 | nft_obj_destroy(nft_trans_obj(trans)); | |
5139 | break; | |
c7c32e72 PNA |
5140 | } |
5141 | kfree(trans); | |
5142 | } | |
5143 | ||
5913beaf | 5144 | static int nf_tables_abort(struct net *net, struct sk_buff *skb) |
37082f93 | 5145 | { |
37082f93 | 5146 | struct nft_trans *trans, *next; |
02263db0 | 5147 | struct nft_trans_elem *te; |
37082f93 | 5148 | |
a907e36d XL |
5149 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
5150 | list) { | |
b380e5c7 | 5151 | switch (trans->msg_type) { |
55dd6f93 PNA |
5152 | case NFT_MSG_NEWTABLE: |
5153 | if (nft_trans_table_update(trans)) { | |
5154 | if (nft_trans_table_enable(trans)) { | |
664b0f8c PNA |
5155 | nf_tables_table_disable(net, |
5156 | trans->ctx.afi, | |
55dd6f93 PNA |
5157 | trans->ctx.table); |
5158 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
5159 | } | |
5160 | nft_trans_destroy(trans); | |
5161 | } else { | |
e688a7f8 | 5162 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
5163 | } |
5164 | break; | |
5165 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 5166 | nft_clear(trans->ctx.net, trans->ctx.table); |
55dd6f93 PNA |
5167 | nft_trans_destroy(trans); |
5168 | break; | |
91c7b38d PNA |
5169 | case NFT_MSG_NEWCHAIN: |
5170 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 5171 | free_percpu(nft_trans_chain_stats(trans)); |
91c7b38d PNA |
5172 | |
5173 | nft_trans_destroy(trans); | |
5174 | } else { | |
4fefee57 | 5175 | trans->ctx.table->use--; |
e688a7f8 | 5176 | list_del_rcu(&trans->ctx.chain->list); |
82bec71d PNA |
5177 | nf_tables_unregister_hooks(trans->ctx.net, |
5178 | trans->ctx.table, | |
c5598794 AB |
5179 | trans->ctx.chain, |
5180 | trans->ctx.afi->nops); | |
91c7b38d PNA |
5181 | } |
5182 | break; | |
5183 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 5184 | trans->ctx.table->use++; |
664b0f8c | 5185 | nft_clear(trans->ctx.net, trans->ctx.chain); |
91c7b38d PNA |
5186 | nft_trans_destroy(trans); |
5187 | break; | |
b380e5c7 | 5188 | case NFT_MSG_NEWRULE: |
4fefee57 | 5189 | trans->ctx.chain->use--; |
b380e5c7 PNA |
5190 | list_del_rcu(&nft_trans_rule(trans)->list); |
5191 | break; | |
5192 | case NFT_MSG_DELRULE: | |
4fefee57 | 5193 | trans->ctx.chain->use++; |
889f7ee7 | 5194 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
37082f93 | 5195 | nft_trans_destroy(trans); |
b380e5c7 | 5196 | break; |
958bee14 | 5197 | case NFT_MSG_NEWSET: |
4fefee57 | 5198 | trans->ctx.table->use--; |
e688a7f8 | 5199 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
5200 | break; |
5201 | case NFT_MSG_DELSET: | |
4fefee57 | 5202 | trans->ctx.table->use++; |
37a9cc52 | 5203 | nft_clear(trans->ctx.net, nft_trans_set(trans)); |
958bee14 PNA |
5204 | nft_trans_destroy(trans); |
5205 | break; | |
60319eb1 | 5206 | case NFT_MSG_NEWSETELEM: |
02263db0 | 5207 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 5208 | |
5cb82a38 | 5209 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a | 5210 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
5211 | break; |
5212 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
5213 | te = (struct nft_trans_elem *)trans->data; |
5214 | ||
59105446 | 5215 | nft_set_elem_activate(net, te->set, &te->elem); |
42a55769 | 5216 | te->set->ops->activate(net, te->set, &te->elem); |
3dd0673a | 5217 | te->set->ndeact--; |
cc02e457 | 5218 | |
e5009240 PNA |
5219 | nft_trans_destroy(trans); |
5220 | break; | |
5221 | case NFT_MSG_NEWOBJ: | |
5222 | trans->ctx.table->use--; | |
5223 | list_del_rcu(&nft_trans_obj(trans)->list); | |
5224 | break; | |
5225 | case NFT_MSG_DELOBJ: | |
5226 | trans->ctx.table->use++; | |
5227 | nft_clear(trans->ctx.net, nft_trans_obj(trans)); | |
60319eb1 PNA |
5228 | nft_trans_destroy(trans); |
5229 | break; | |
37082f93 | 5230 | } |
37082f93 PNA |
5231 | } |
5232 | ||
b326dd37 PNA |
5233 | synchronize_rcu(); |
5234 | ||
a1cee076 PNA |
5235 | list_for_each_entry_safe_reverse(trans, next, |
5236 | &net->nft.commit_list, list) { | |
c7c32e72 | 5237 | list_del(&trans->list); |
b326dd37 | 5238 | nf_tables_abort_release(trans); |
37082f93 PNA |
5239 | } |
5240 | ||
5241 | return 0; | |
5242 | } | |
5243 | ||
74e8bcd2 PNA |
5244 | static bool nf_tables_valid_genid(struct net *net, u32 genid) |
5245 | { | |
5246 | return net->nft.base_seq == genid; | |
5247 | } | |
5248 | ||
96518518 PM |
5249 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
5250 | .name = "nf_tables", | |
5251 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
5252 | .cb_count = NFT_MSG_MAX, | |
5253 | .cb = nf_tables_cb, | |
0628b123 PNA |
5254 | .commit = nf_tables_commit, |
5255 | .abort = nf_tables_abort, | |
74e8bcd2 | 5256 | .valid_genid = nf_tables_valid_genid, |
96518518 PM |
5257 | }; |
5258 | ||
7210e4e3 PNA |
5259 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
5260 | enum nft_chain_type type) | |
5261 | { | |
5262 | const struct nft_base_chain *basechain; | |
5263 | ||
f323d954 | 5264 | if (nft_is_base_chain(chain)) { |
7210e4e3 PNA |
5265 | basechain = nft_base_chain(chain); |
5266 | if (basechain->type->type != type) | |
5267 | return -EOPNOTSUPP; | |
5268 | } | |
5269 | return 0; | |
5270 | } | |
5271 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
5272 | ||
75e8d06d PNA |
5273 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
5274 | unsigned int hook_flags) | |
5275 | { | |
5276 | struct nft_base_chain *basechain; | |
5277 | ||
f323d954 | 5278 | if (nft_is_base_chain(chain)) { |
75e8d06d PNA |
5279 | basechain = nft_base_chain(chain); |
5280 | ||
5281 | if ((1 << basechain->ops[0].hooknum) & hook_flags) | |
5282 | return 0; | |
5283 | ||
5284 | return -EOPNOTSUPP; | |
5285 | } | |
5286 | ||
5287 | return 0; | |
5288 | } | |
5289 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
5290 | ||
20a69341 PM |
5291 | /* |
5292 | * Loop detection - walk through the ruleset beginning at the destination chain | |
5293 | * of a new jump until either the source chain is reached (loop) or all | |
5294 | * reachable chains have been traversed. | |
5295 | * | |
5296 | * The loop check is performed whenever a new jump verdict is added to an | |
5297 | * expression or verdict map or a verdict map is bound to a new chain. | |
5298 | */ | |
5299 | ||
5300 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
5301 | const struct nft_chain *chain); | |
5302 | ||
5303 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 5304 | struct nft_set *set, |
20a69341 | 5305 | const struct nft_set_iter *iter, |
de70185d | 5306 | struct nft_set_elem *elem) |
20a69341 | 5307 | { |
fe2811eb PM |
5308 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
5309 | const struct nft_data *data; | |
5310 | ||
5311 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
5312 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
5313 | return 0; |
5314 | ||
fe2811eb | 5315 | data = nft_set_ext_data(ext); |
1ca2e170 | 5316 | switch (data->verdict.code) { |
20a69341 PM |
5317 | case NFT_JUMP: |
5318 | case NFT_GOTO: | |
1ca2e170 | 5319 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
5320 | default: |
5321 | return 0; | |
5322 | } | |
5323 | } | |
5324 | ||
5325 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
5326 | const struct nft_chain *chain) | |
5327 | { | |
5328 | const struct nft_rule *rule; | |
5329 | const struct nft_expr *expr, *last; | |
de70185d | 5330 | struct nft_set *set; |
20a69341 PM |
5331 | struct nft_set_binding *binding; |
5332 | struct nft_set_iter iter; | |
20a69341 PM |
5333 | |
5334 | if (ctx->chain == chain) | |
5335 | return -ELOOP; | |
5336 | ||
5337 | list_for_each_entry(rule, &chain->rules, list) { | |
5338 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
5339 | const struct nft_data *data = NULL; |
5340 | int err; | |
5341 | ||
5342 | if (!expr->ops->validate) | |
20a69341 PM |
5343 | continue; |
5344 | ||
0ca743a5 PNA |
5345 | err = expr->ops->validate(ctx, expr, &data); |
5346 | if (err < 0) | |
5347 | return err; | |
5348 | ||
20a69341 | 5349 | if (data == NULL) |
0ca743a5 | 5350 | continue; |
20a69341 | 5351 | |
1ca2e170 | 5352 | switch (data->verdict.code) { |
20a69341 PM |
5353 | case NFT_JUMP: |
5354 | case NFT_GOTO: | |
1ca2e170 PM |
5355 | err = nf_tables_check_loops(ctx, |
5356 | data->verdict.chain); | |
20a69341 PM |
5357 | if (err < 0) |
5358 | return err; | |
5359 | default: | |
5360 | break; | |
5361 | } | |
5362 | } | |
5363 | } | |
5364 | ||
5365 | list_for_each_entry(set, &ctx->table->sets, list) { | |
37a9cc52 PNA |
5366 | if (!nft_is_active_next(ctx->net, set)) |
5367 | continue; | |
20a69341 PM |
5368 | if (!(set->flags & NFT_SET_MAP) || |
5369 | set->dtype != NFT_DATA_VERDICT) | |
5370 | continue; | |
5371 | ||
5372 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
5373 | if (!(binding->flags & NFT_SET_MAP) || |
5374 | binding->chain != chain) | |
20a69341 PM |
5375 | continue; |
5376 | ||
8588ac09 | 5377 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
5378 | iter.skip = 0; |
5379 | iter.count = 0; | |
5380 | iter.err = 0; | |
5381 | iter.fn = nf_tables_loop_check_setelem; | |
5382 | ||
5383 | set->ops->walk(ctx, set, &iter); | |
5384 | if (iter.err < 0) | |
5385 | return iter.err; | |
5386 | } | |
5387 | } | |
5388 | ||
5389 | return 0; | |
5390 | } | |
5391 | ||
36b701fa LGL |
5392 | /** |
5393 | * nft_parse_u32_check - fetch u32 attribute and check for maximum value | |
5394 | * | |
5395 | * @attr: netlink attribute to fetch value from | |
5396 | * @max: maximum value to be stored in dest | |
5397 | * @dest: pointer to the variable | |
5398 | * | |
5399 | * Parse, check and store a given u32 netlink attribute into variable. | |
5400 | * This function returns -ERANGE if the value goes over maximum value. | |
5401 | * Otherwise a 0 is returned and the attribute value is stored in the | |
5402 | * destination variable. | |
5403 | */ | |
f1d505bb | 5404 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) |
36b701fa | 5405 | { |
09525a09 | 5406 | u32 val; |
36b701fa LGL |
5407 | |
5408 | val = ntohl(nla_get_be32(attr)); | |
5409 | if (val > max) | |
5410 | return -ERANGE; | |
5411 | ||
5412 | *dest = val; | |
5413 | return 0; | |
5414 | } | |
5415 | EXPORT_SYMBOL_GPL(nft_parse_u32_check); | |
5416 | ||
49499c3e PM |
5417 | /** |
5418 | * nft_parse_register - parse a register value from a netlink attribute | |
5419 | * | |
5420 | * @attr: netlink attribute | |
5421 | * | |
5422 | * Parse and translate a register value from a netlink attribute. | |
5423 | * Registers used to be 128 bit wide, these register numbers will be | |
5424 | * mapped to the corresponding 32 bit register numbers. | |
5425 | */ | |
b1c96ed3 PM |
5426 | unsigned int nft_parse_register(const struct nlattr *attr) |
5427 | { | |
49499c3e PM |
5428 | unsigned int reg; |
5429 | ||
5430 | reg = ntohl(nla_get_be32(attr)); | |
5431 | switch (reg) { | |
5432 | case NFT_REG_VERDICT...NFT_REG_4: | |
5433 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
5434 | default: | |
5435 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
5436 | } | |
b1c96ed3 PM |
5437 | } |
5438 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
5439 | ||
49499c3e PM |
5440 | /** |
5441 | * nft_dump_register - dump a register value to a netlink attribute | |
5442 | * | |
5443 | * @skb: socket buffer | |
5444 | * @attr: attribute number | |
5445 | * @reg: register number | |
5446 | * | |
5447 | * Construct a netlink attribute containing the register number. For | |
5448 | * compatibility reasons, register numbers being a multiple of 4 are | |
5449 | * translated to the corresponding 128 bit register numbers. | |
5450 | */ | |
b1c96ed3 PM |
5451 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
5452 | { | |
49499c3e PM |
5453 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
5454 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
5455 | else | |
5456 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
5457 | ||
b1c96ed3 PM |
5458 | return nla_put_be32(skb, attr, htonl(reg)); |
5459 | } | |
5460 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
5461 | ||
96518518 | 5462 | /** |
d07db988 | 5463 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
5464 | * |
5465 | * @reg: the register number | |
d07db988 | 5466 | * @len: the length of the data |
96518518 PM |
5467 | * |
5468 | * Validate that the input register is one of the general purpose | |
d07db988 | 5469 | * registers and that the length of the load is within the bounds. |
96518518 | 5470 | */ |
d07db988 | 5471 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 5472 | { |
49499c3e | 5473 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 5474 | return -EINVAL; |
d07db988 PM |
5475 | if (len == 0) |
5476 | return -EINVAL; | |
49499c3e | 5477 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 5478 | return -ERANGE; |
49499c3e | 5479 | |
96518518 PM |
5480 | return 0; |
5481 | } | |
d07db988 | 5482 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 5483 | |
96518518 | 5484 | /** |
1ec10212 | 5485 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
5486 | * |
5487 | * @ctx: context of the expression performing the load | |
5488 | * @reg: the destination register number | |
5489 | * @data: the data to load | |
5490 | * @type: the data type | |
45d9bcda | 5491 | * @len: the length of the data |
96518518 PM |
5492 | * |
5493 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
5494 | * the destination register and the length is within the bounds. |
5495 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 5496 | * data. |
96518518 | 5497 | */ |
1ec10212 PM |
5498 | int nft_validate_register_store(const struct nft_ctx *ctx, |
5499 | enum nft_registers reg, | |
5500 | const struct nft_data *data, | |
5501 | enum nft_data_types type, unsigned int len) | |
96518518 | 5502 | { |
20a69341 PM |
5503 | int err; |
5504 | ||
96518518 PM |
5505 | switch (reg) { |
5506 | case NFT_REG_VERDICT: | |
58f40ab6 | 5507 | if (type != NFT_DATA_VERDICT) |
96518518 | 5508 | return -EINVAL; |
20a69341 | 5509 | |
58f40ab6 | 5510 | if (data != NULL && |
1ca2e170 PM |
5511 | (data->verdict.code == NFT_GOTO || |
5512 | data->verdict.code == NFT_JUMP)) { | |
5513 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
5514 | if (err < 0) |
5515 | return err; | |
5516 | ||
1ca2e170 PM |
5517 | if (ctx->chain->level + 1 > |
5518 | data->verdict.chain->level) { | |
20a69341 PM |
5519 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
5520 | return -EMLINK; | |
1ca2e170 | 5521 | data->verdict.chain->level = ctx->chain->level + 1; |
20a69341 PM |
5522 | } |
5523 | } | |
5524 | ||
96518518 PM |
5525 | return 0; |
5526 | default: | |
49499c3e | 5527 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 5528 | return -EINVAL; |
45d9bcda PM |
5529 | if (len == 0) |
5530 | return -EINVAL; | |
49499c3e PM |
5531 | if (reg * NFT_REG32_SIZE + len > |
5532 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 5533 | return -ERANGE; |
27e6d201 | 5534 | |
96518518 PM |
5535 | if (data != NULL && type != NFT_DATA_VALUE) |
5536 | return -EINVAL; | |
5537 | return 0; | |
5538 | } | |
5539 | } | |
1ec10212 | 5540 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
5541 | |
5542 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
5543 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
5544 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
5545 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
5546 | }; | |
5547 | ||
5548 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
5549 | struct nft_data_desc *desc, const struct nlattr *nla) | |
5550 | { | |
664b0f8c | 5551 | u8 genmask = nft_genmask_next(ctx->net); |
96518518 PM |
5552 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
5553 | struct nft_chain *chain; | |
5554 | int err; | |
5555 | ||
fceb6435 JB |
5556 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy, |
5557 | NULL); | |
96518518 PM |
5558 | if (err < 0) |
5559 | return err; | |
5560 | ||
5561 | if (!tb[NFTA_VERDICT_CODE]) | |
5562 | return -EINVAL; | |
1ca2e170 | 5563 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 5564 | |
1ca2e170 | 5565 | switch (data->verdict.code) { |
e0abdadc | 5566 | default: |
1ca2e170 | 5567 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
5568 | case NF_ACCEPT: |
5569 | case NF_DROP: | |
5570 | case NF_QUEUE: | |
5571 | break; | |
5572 | default: | |
5573 | return -EINVAL; | |
5574 | } | |
5575 | /* fall through */ | |
96518518 PM |
5576 | case NFT_CONTINUE: |
5577 | case NFT_BREAK: | |
5578 | case NFT_RETURN: | |
96518518 PM |
5579 | break; |
5580 | case NFT_JUMP: | |
5581 | case NFT_GOTO: | |
5582 | if (!tb[NFTA_VERDICT_CHAIN]) | |
5583 | return -EINVAL; | |
5584 | chain = nf_tables_chain_lookup(ctx->table, | |
664b0f8c | 5585 | tb[NFTA_VERDICT_CHAIN], genmask); |
96518518 PM |
5586 | if (IS_ERR(chain)) |
5587 | return PTR_ERR(chain); | |
f323d954 | 5588 | if (nft_is_base_chain(chain)) |
96518518 PM |
5589 | return -EOPNOTSUPP; |
5590 | ||
96518518 | 5591 | chain->use++; |
1ca2e170 | 5592 | data->verdict.chain = chain; |
96518518 | 5593 | break; |
96518518 PM |
5594 | } |
5595 | ||
4c4ed074 | 5596 | desc->len = sizeof(data->verdict); |
96518518 PM |
5597 | desc->type = NFT_DATA_VERDICT; |
5598 | return 0; | |
5599 | } | |
5600 | ||
5601 | static void nft_verdict_uninit(const struct nft_data *data) | |
5602 | { | |
1ca2e170 | 5603 | switch (data->verdict.code) { |
96518518 PM |
5604 | case NFT_JUMP: |
5605 | case NFT_GOTO: | |
1ca2e170 | 5606 | data->verdict.chain->use--; |
96518518 PM |
5607 | break; |
5608 | } | |
5609 | } | |
5610 | ||
33d5a7b1 | 5611 | int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) |
96518518 PM |
5612 | { |
5613 | struct nlattr *nest; | |
5614 | ||
33d5a7b1 | 5615 | nest = nla_nest_start(skb, type); |
96518518 PM |
5616 | if (!nest) |
5617 | goto nla_put_failure; | |
5618 | ||
33d5a7b1 | 5619 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) |
96518518 PM |
5620 | goto nla_put_failure; |
5621 | ||
33d5a7b1 | 5622 | switch (v->code) { |
96518518 PM |
5623 | case NFT_JUMP: |
5624 | case NFT_GOTO: | |
1ca2e170 | 5625 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
33d5a7b1 | 5626 | v->chain->name)) |
96518518 PM |
5627 | goto nla_put_failure; |
5628 | } | |
5629 | nla_nest_end(skb, nest); | |
5630 | return 0; | |
5631 | ||
5632 | nla_put_failure: | |
5633 | return -1; | |
5634 | } | |
5635 | ||
d0a11fc3 PM |
5636 | static int nft_value_init(const struct nft_ctx *ctx, |
5637 | struct nft_data *data, unsigned int size, | |
96518518 PM |
5638 | struct nft_data_desc *desc, const struct nlattr *nla) |
5639 | { | |
5640 | unsigned int len; | |
5641 | ||
5642 | len = nla_len(nla); | |
5643 | if (len == 0) | |
5644 | return -EINVAL; | |
d0a11fc3 | 5645 | if (len > size) |
96518518 PM |
5646 | return -EOVERFLOW; |
5647 | ||
d0a11fc3 | 5648 | nla_memcpy(data->data, nla, len); |
96518518 PM |
5649 | desc->type = NFT_DATA_VALUE; |
5650 | desc->len = len; | |
5651 | return 0; | |
5652 | } | |
5653 | ||
5654 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
5655 | unsigned int len) | |
5656 | { | |
5657 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
5658 | } | |
5659 | ||
5660 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 5661 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
5662 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
5663 | }; | |
5664 | ||
5665 | /** | |
5666 | * nft_data_init - parse nf_tables data netlink attributes | |
5667 | * | |
5668 | * @ctx: context of the expression using the data | |
5669 | * @data: destination struct nft_data | |
d0a11fc3 | 5670 | * @size: maximum data length |
96518518 PM |
5671 | * @desc: data description |
5672 | * @nla: netlink attribute containing data | |
5673 | * | |
5674 | * Parse the netlink data attributes and initialize a struct nft_data. | |
5675 | * The type and length of data are returned in the data description. | |
5676 | * | |
5677 | * The caller can indicate that it only wants to accept data of type | |
5678 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
5679 | */ | |
d0a11fc3 PM |
5680 | int nft_data_init(const struct nft_ctx *ctx, |
5681 | struct nft_data *data, unsigned int size, | |
96518518 PM |
5682 | struct nft_data_desc *desc, const struct nlattr *nla) |
5683 | { | |
5684 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
5685 | int err; | |
5686 | ||
fceb6435 | 5687 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL); |
96518518 PM |
5688 | if (err < 0) |
5689 | return err; | |
5690 | ||
5691 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
5692 | return nft_value_init(ctx, data, size, desc, |
5693 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
5694 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
5695 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
5696 | return -EINVAL; | |
5697 | } | |
5698 | EXPORT_SYMBOL_GPL(nft_data_init); | |
5699 | ||
5700 | /** | |
59105446 | 5701 | * nft_data_release - release a nft_data item |
96518518 PM |
5702 | * |
5703 | * @data: struct nft_data to release | |
5704 | * @type: type of data | |
5705 | * | |
5706 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
5707 | * all others need to be released by calling this function. | |
5708 | */ | |
59105446 | 5709 | void nft_data_release(const struct nft_data *data, enum nft_data_types type) |
96518518 | 5710 | { |
960bd2c2 | 5711 | if (type < NFT_DATA_VERDICT) |
96518518 | 5712 | return; |
960bd2c2 | 5713 | switch (type) { |
96518518 PM |
5714 | case NFT_DATA_VERDICT: |
5715 | return nft_verdict_uninit(data); | |
5716 | default: | |
5717 | WARN_ON(1); | |
5718 | } | |
5719 | } | |
59105446 | 5720 | EXPORT_SYMBOL_GPL(nft_data_release); |
96518518 PM |
5721 | |
5722 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
5723 | enum nft_data_types type, unsigned int len) | |
5724 | { | |
5725 | struct nlattr *nest; | |
5726 | int err; | |
5727 | ||
5728 | nest = nla_nest_start(skb, attr); | |
5729 | if (nest == NULL) | |
5730 | return -1; | |
5731 | ||
5732 | switch (type) { | |
5733 | case NFT_DATA_VALUE: | |
5734 | err = nft_value_dump(skb, data, len); | |
5735 | break; | |
5736 | case NFT_DATA_VERDICT: | |
33d5a7b1 | 5737 | err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); |
96518518 PM |
5738 | break; |
5739 | default: | |
5740 | err = -EINVAL; | |
5741 | WARN_ON(1); | |
5742 | } | |
5743 | ||
5744 | nla_nest_end(skb, nest); | |
5745 | return err; | |
5746 | } | |
5747 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
5748 | ||
df05ef87 | 5749 | static int __net_init nf_tables_init_net(struct net *net) |
99633ab2 PNA |
5750 | { |
5751 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 5752 | INIT_LIST_HEAD(&net->nft.commit_list); |
38e029f1 | 5753 | net->nft.base_seq = 1; |
99633ab2 PNA |
5754 | return 0; |
5755 | } | |
5756 | ||
5ebe0b0e PNA |
5757 | int __nft_release_basechain(struct nft_ctx *ctx) |
5758 | { | |
5759 | struct nft_rule *rule, *nr; | |
5760 | ||
f323d954 | 5761 | BUG_ON(!nft_is_base_chain(ctx->chain)); |
5ebe0b0e | 5762 | |
82bec71d | 5763 | nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain, |
5ebe0b0e PNA |
5764 | ctx->afi->nops); |
5765 | list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { | |
5766 | list_del(&rule->list); | |
5767 | ctx->chain->use--; | |
5768 | nf_tables_rule_destroy(ctx, rule); | |
5769 | } | |
5770 | list_del(&ctx->chain->list); | |
5771 | ctx->table->use--; | |
5772 | nf_tables_chain_destroy(ctx->chain); | |
5773 | ||
5774 | return 0; | |
5775 | } | |
5776 | EXPORT_SYMBOL_GPL(__nft_release_basechain); | |
5777 | ||
df05ef87 PNA |
5778 | /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */ |
5779 | static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi) | |
5780 | { | |
5781 | struct nft_table *table, *nt; | |
5782 | struct nft_chain *chain, *nc; | |
e5009240 | 5783 | struct nft_object *obj, *ne; |
df05ef87 PNA |
5784 | struct nft_rule *rule, *nr; |
5785 | struct nft_set *set, *ns; | |
5786 | struct nft_ctx ctx = { | |
5787 | .net = net, | |
5788 | .afi = afi, | |
5789 | }; | |
5790 | ||
5791 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
5792 | list_for_each_entry(chain, &table->chains, list) | |
82bec71d PNA |
5793 | nf_tables_unregister_hooks(net, table, chain, |
5794 | afi->nops); | |
df05ef87 PNA |
5795 | /* No packets are walking on these chains anymore. */ |
5796 | ctx.table = table; | |
5797 | list_for_each_entry(chain, &table->chains, list) { | |
5798 | ctx.chain = chain; | |
5799 | list_for_each_entry_safe(rule, nr, &chain->rules, list) { | |
5800 | list_del(&rule->list); | |
5801 | chain->use--; | |
5802 | nf_tables_rule_destroy(&ctx, rule); | |
5803 | } | |
5804 | } | |
5805 | list_for_each_entry_safe(set, ns, &table->sets, list) { | |
5806 | list_del(&set->list); | |
5807 | table->use--; | |
5808 | nft_set_destroy(set); | |
5809 | } | |
e5009240 PNA |
5810 | list_for_each_entry_safe(obj, ne, &table->objects, list) { |
5811 | list_del(&obj->list); | |
5812 | table->use--; | |
5813 | nft_obj_destroy(obj); | |
5814 | } | |
df05ef87 PNA |
5815 | list_for_each_entry_safe(chain, nc, &table->chains, list) { |
5816 | list_del(&chain->list); | |
5817 | table->use--; | |
5818 | nf_tables_chain_destroy(chain); | |
5819 | } | |
5820 | list_del(&table->list); | |
5821 | nf_tables_table_destroy(&ctx); | |
5822 | } | |
5823 | } | |
5824 | ||
99633ab2 PNA |
5825 | static struct pernet_operations nf_tables_net_ops = { |
5826 | .init = nf_tables_init_net, | |
5827 | }; | |
5828 | ||
96518518 PM |
5829 | static int __init nf_tables_module_init(void) |
5830 | { | |
5831 | int err; | |
5832 | ||
5833 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
5834 | GFP_KERNEL); | |
5835 | if (info == NULL) { | |
5836 | err = -ENOMEM; | |
5837 | goto err1; | |
5838 | } | |
5839 | ||
5840 | err = nf_tables_core_module_init(); | |
5841 | if (err < 0) | |
5842 | goto err2; | |
5843 | ||
5844 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
5845 | if (err < 0) | |
5846 | goto err3; | |
5847 | ||
5848 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 5849 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
5850 | err3: |
5851 | nf_tables_core_module_exit(); | |
5852 | err2: | |
5853 | kfree(info); | |
5854 | err1: | |
5855 | return err; | |
5856 | } | |
5857 | ||
5858 | static void __exit nf_tables_module_exit(void) | |
5859 | { | |
99633ab2 | 5860 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 | 5861 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
1b1bc49c | 5862 | rcu_barrier(); |
96518518 PM |
5863 | nf_tables_core_module_exit(); |
5864 | kfree(info); | |
5865 | } | |
5866 | ||
5867 | module_init(nf_tables_module_init); | |
5868 | module_exit(nf_tables_module_exit); | |
5869 | ||
5870 | MODULE_LICENSE("GPL"); | |
5871 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
5872 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |