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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 | |
1cae565e | 729 | nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN); |
96518518 | 730 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 731 | INIT_LIST_HEAD(&table->sets); |
e5009240 | 732 | INIT_LIST_HEAD(&table->objects); |
c5c1f975 | 733 | table->flags = flags; |
9ddf6323 | 734 | |
633c9a84 | 735 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
55dd6f93 | 736 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
ffdb210e | 737 | if (err < 0) |
ebddf1a8 | 738 | goto err3; |
ffdb210e | 739 | |
e688a7f8 | 740 | list_add_tail_rcu(&table->list, &afi->tables); |
96518518 | 741 | return 0; |
ebddf1a8 | 742 | err3: |
ffdb210e | 743 | kfree(table); |
ebddf1a8 | 744 | err2: |
ffdb210e | 745 | module_put(afi->owner); |
ebddf1a8 | 746 | err1: |
ffdb210e | 747 | return err; |
96518518 PM |
748 | } |
749 | ||
b9ac12ef AB |
750 | static int nft_flush_table(struct nft_ctx *ctx) |
751 | { | |
752 | int err; | |
753 | struct nft_chain *chain, *nc; | |
e5009240 | 754 | struct nft_object *obj, *ne; |
b9ac12ef AB |
755 | struct nft_set *set, *ns; |
756 | ||
a2f18db0 | 757 | list_for_each_entry(chain, &ctx->table->chains, list) { |
664b0f8c PNA |
758 | if (!nft_is_active_next(ctx->net, chain)) |
759 | continue; | |
760 | ||
b9ac12ef AB |
761 | ctx->chain = chain; |
762 | ||
763 | err = nft_delrule_by_chain(ctx); | |
764 | if (err < 0) | |
765 | goto out; | |
b9ac12ef AB |
766 | } |
767 | ||
768 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
37a9cc52 PNA |
769 | if (!nft_is_active_next(ctx->net, set)) |
770 | continue; | |
771 | ||
b9ac12ef AB |
772 | if (set->flags & NFT_SET_ANONYMOUS && |
773 | !list_empty(&set->bindings)) | |
774 | continue; | |
775 | ||
776 | err = nft_delset(ctx, set); | |
777 | if (err < 0) | |
778 | goto out; | |
779 | } | |
780 | ||
e5009240 PNA |
781 | list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { |
782 | err = nft_delobj(ctx, obj); | |
783 | if (err < 0) | |
784 | goto out; | |
785 | } | |
786 | ||
a2f18db0 | 787 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
664b0f8c PNA |
788 | if (!nft_is_active_next(ctx->net, chain)) |
789 | continue; | |
790 | ||
a2f18db0 PNA |
791 | ctx->chain = chain; |
792 | ||
793 | err = nft_delchain(ctx); | |
794 | if (err < 0) | |
795 | goto out; | |
796 | } | |
797 | ||
b9ac12ef AB |
798 | err = nft_deltable(ctx); |
799 | out: | |
800 | return err; | |
801 | } | |
802 | ||
803 | static int nft_flush(struct nft_ctx *ctx, int family) | |
804 | { | |
805 | struct nft_af_info *afi; | |
806 | struct nft_table *table, *nt; | |
807 | const struct nlattr * const *nla = ctx->nla; | |
808 | int err = 0; | |
809 | ||
810 | list_for_each_entry(afi, &ctx->net->nft.af_info, list) { | |
811 | if (family != AF_UNSPEC && afi->family != family) | |
812 | continue; | |
813 | ||
814 | ctx->afi = afi; | |
815 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
f2a6d766 PNA |
816 | if (!nft_is_active_next(ctx->net, table)) |
817 | continue; | |
818 | ||
b9ac12ef AB |
819 | if (nla[NFTA_TABLE_NAME] && |
820 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
821 | continue; | |
822 | ||
823 | ctx->table = table; | |
824 | ||
825 | err = nft_flush_table(ctx); | |
826 | if (err < 0) | |
827 | goto out; | |
828 | } | |
829 | } | |
830 | out: | |
831 | return err; | |
832 | } | |
833 | ||
633c9a84 PNA |
834 | static int nf_tables_deltable(struct net *net, struct sock *nlsk, |
835 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
836 | const struct nlattr * const nla[], |
837 | struct netlink_ext_ack *extack) | |
96518518 PM |
838 | { |
839 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 840 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
841 | struct nft_af_info *afi; |
842 | struct nft_table *table; | |
ee01d542 | 843 | int family = nfmsg->nfgen_family; |
55dd6f93 | 844 | struct nft_ctx ctx; |
96518518 | 845 | |
633c9a84 | 846 | nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla); |
b9ac12ef AB |
847 | if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL) |
848 | return nft_flush(&ctx, family); | |
849 | ||
99633ab2 | 850 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
851 | if (IS_ERR(afi)) |
852 | return PTR_ERR(afi); | |
853 | ||
f2a6d766 | 854 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
855 | if (IS_ERR(table)) |
856 | return PTR_ERR(table); | |
96518518 | 857 | |
b9ac12ef AB |
858 | ctx.afi = afi; |
859 | ctx.table = table; | |
55dd6f93 | 860 | |
b9ac12ef | 861 | return nft_flush_table(&ctx); |
96518518 PM |
862 | } |
863 | ||
55dd6f93 PNA |
864 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
865 | { | |
4fefee57 PNA |
866 | BUG_ON(ctx->table->use > 0); |
867 | ||
55dd6f93 PNA |
868 | kfree(ctx->table); |
869 | module_put(ctx->afi->owner); | |
870 | } | |
871 | ||
2a37d755 | 872 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 873 | { |
9370761c | 874 | int err = 0; |
96518518 | 875 | |
d8297d4f FW |
876 | if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO)) |
877 | return -EINVAL; | |
878 | ||
96518518 | 879 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c PNA |
880 | if (chain_type[ctype->family][ctype->type] != NULL) { |
881 | err = -EBUSY; | |
882 | goto out; | |
96518518 | 883 | } |
9370761c PNA |
884 | chain_type[ctype->family][ctype->type] = ctype; |
885 | out: | |
96518518 PM |
886 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
887 | return err; | |
888 | } | |
9370761c | 889 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 890 | |
2a37d755 | 891 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 892 | { |
96518518 | 893 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 894 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
895 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
896 | } | |
9370761c | 897 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
898 | |
899 | /* | |
900 | * Chains | |
901 | */ | |
902 | ||
903 | static struct nft_chain * | |
664b0f8c PNA |
904 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle, |
905 | u8 genmask) | |
96518518 PM |
906 | { |
907 | struct nft_chain *chain; | |
908 | ||
909 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
910 | if (chain->handle == handle && |
911 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
912 | return chain; |
913 | } | |
914 | ||
915 | return ERR_PTR(-ENOENT); | |
916 | } | |
917 | ||
918 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
664b0f8c PNA |
919 | const struct nlattr *nla, |
920 | u8 genmask) | |
96518518 PM |
921 | { |
922 | struct nft_chain *chain; | |
923 | ||
924 | if (nla == NULL) | |
925 | return ERR_PTR(-EINVAL); | |
926 | ||
927 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
928 | if (!nla_strcmp(nla, chain->name) && |
929 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
930 | return chain; |
931 | } | |
932 | ||
933 | return ERR_PTR(-ENOENT); | |
934 | } | |
935 | ||
936 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
b2fbd044 LZ |
937 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, |
938 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
939 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
940 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
941 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
942 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 943 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 944 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 945 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
946 | }; |
947 | ||
948 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
949 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
950 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
2cbce139 PNA |
951 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
952 | .len = IFNAMSIZ - 1 }, | |
96518518 PM |
953 | }; |
954 | ||
0ca743a5 PNA |
955 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
956 | { | |
957 | struct nft_stats *cpu_stats, total; | |
958 | struct nlattr *nest; | |
ce355e20 ED |
959 | unsigned int seq; |
960 | u64 pkts, bytes; | |
0ca743a5 PNA |
961 | int cpu; |
962 | ||
963 | memset(&total, 0, sizeof(total)); | |
964 | for_each_possible_cpu(cpu) { | |
965 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
966 | do { |
967 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
968 | pkts = cpu_stats->pkts; | |
969 | bytes = cpu_stats->bytes; | |
970 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
971 | total.pkts += pkts; | |
972 | total.bytes += bytes; | |
0ca743a5 PNA |
973 | } |
974 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
975 | if (nest == NULL) | |
976 | goto nla_put_failure; | |
977 | ||
b46f6ded ND |
978 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), |
979 | NFTA_COUNTER_PAD) || | |
980 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), | |
981 | NFTA_COUNTER_PAD)) | |
0ca743a5 PNA |
982 | goto nla_put_failure; |
983 | ||
984 | nla_nest_end(skb, nest); | |
985 | return 0; | |
986 | ||
987 | nla_put_failure: | |
988 | return -ENOSPC; | |
989 | } | |
990 | ||
84d7fce6 PNA |
991 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
992 | u32 portid, u32 seq, int event, u32 flags, | |
993 | int family, const struct nft_table *table, | |
96518518 PM |
994 | const struct nft_chain *chain) |
995 | { | |
996 | struct nlmsghdr *nlh; | |
997 | struct nfgenmsg *nfmsg; | |
998 | ||
dedb67c4 | 999 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
1000 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
1001 | if (nlh == NULL) | |
1002 | goto nla_put_failure; | |
1003 | ||
1004 | nfmsg = nlmsg_data(nlh); | |
1005 | nfmsg->nfgen_family = family; | |
1006 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1007 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1008 | |
1009 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
1010 | goto nla_put_failure; | |
b46f6ded ND |
1011 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), |
1012 | NFTA_CHAIN_PAD)) | |
96518518 PM |
1013 | goto nla_put_failure; |
1014 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
1015 | goto nla_put_failure; | |
1016 | ||
f323d954 | 1017 | if (nft_is_base_chain(chain)) { |
0ca743a5 | 1018 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 1019 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
1020 | struct nlattr *nest; |
1021 | ||
1022 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
1023 | if (nest == NULL) |
1024 | goto nla_put_failure; | |
1025 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
1026 | goto nla_put_failure; | |
1027 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
1028 | goto nla_put_failure; | |
2cbce139 PNA |
1029 | if (basechain->dev_name[0] && |
1030 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) | |
1031 | goto nla_put_failure; | |
96518518 | 1032 | nla_nest_end(skb, nest); |
9370761c | 1033 | |
0ca743a5 PNA |
1034 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
1035 | htonl(basechain->policy))) | |
1036 | goto nla_put_failure; | |
1037 | ||
baae3e62 PM |
1038 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
1039 | goto nla_put_failure; | |
0ca743a5 PNA |
1040 | |
1041 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
1042 | goto nla_put_failure; | |
96518518 PM |
1043 | } |
1044 | ||
0ca743a5 PNA |
1045 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
1046 | goto nla_put_failure; | |
1047 | ||
053c095a JB |
1048 | nlmsg_end(skb, nlh); |
1049 | return 0; | |
96518518 PM |
1050 | |
1051 | nla_put_failure: | |
1052 | nlmsg_trim(skb, nlh); | |
1053 | return -1; | |
1054 | } | |
1055 | ||
25e94a99 | 1056 | static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
1057 | { |
1058 | struct sk_buff *skb; | |
96518518 PM |
1059 | int err; |
1060 | ||
128ad332 PNA |
1061 | if (!ctx->report && |
1062 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 1063 | return; |
96518518 | 1064 | |
96518518 PM |
1065 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1066 | if (skb == NULL) | |
1067 | goto err; | |
1068 | ||
84d7fce6 PNA |
1069 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
1070 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1071 | ctx->chain); |
96518518 PM |
1072 | if (err < 0) { |
1073 | kfree_skb(skb); | |
1074 | goto err; | |
1075 | } | |
1076 | ||
25e94a99 PNA |
1077 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1078 | ctx->report, GFP_KERNEL); | |
1079 | return; | |
96518518 | 1080 | err: |
25e94a99 | 1081 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
1082 | } |
1083 | ||
1084 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1085 | struct netlink_callback *cb) | |
1086 | { | |
1087 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1088 | const struct nft_af_info *afi; | |
1089 | const struct nft_table *table; | |
1090 | const struct nft_chain *chain; | |
1091 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1092 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1093 | int family = nfmsg->nfgen_family; |
1094 | ||
e688a7f8 | 1095 | rcu_read_lock(); |
38e029f1 PNA |
1096 | cb->seq = net->nft.base_seq; |
1097 | ||
e688a7f8 | 1098 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1099 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1100 | continue; | |
1101 | ||
e688a7f8 PNA |
1102 | list_for_each_entry_rcu(table, &afi->tables, list) { |
1103 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
96518518 PM |
1104 | if (idx < s_idx) |
1105 | goto cont; | |
1106 | if (idx > s_idx) | |
1107 | memset(&cb->args[1], 0, | |
1108 | sizeof(cb->args) - sizeof(cb->args[0])); | |
664b0f8c PNA |
1109 | if (!nft_is_active(net, chain)) |
1110 | continue; | |
84d7fce6 PNA |
1111 | if (nf_tables_fill_chain_info(skb, net, |
1112 | NETLINK_CB(cb->skb).portid, | |
96518518 PM |
1113 | cb->nlh->nlmsg_seq, |
1114 | NFT_MSG_NEWCHAIN, | |
1115 | NLM_F_MULTI, | |
1116 | afi->family, table, chain) < 0) | |
1117 | goto done; | |
38e029f1 PNA |
1118 | |
1119 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
1120 | cont: |
1121 | idx++; | |
1122 | } | |
1123 | } | |
1124 | } | |
1125 | done: | |
e688a7f8 | 1126 | rcu_read_unlock(); |
96518518 PM |
1127 | cb->args[0] = idx; |
1128 | return skb->len; | |
1129 | } | |
1130 | ||
7b8002a1 PNA |
1131 | static int nf_tables_getchain(struct net *net, struct sock *nlsk, |
1132 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1133 | const struct nlattr * const nla[], |
1134 | struct netlink_ext_ack *extack) | |
96518518 PM |
1135 | { |
1136 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1137 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
1138 | const struct nft_af_info *afi; |
1139 | const struct nft_table *table; | |
1140 | const struct nft_chain *chain; | |
1141 | struct sk_buff *skb2; | |
1142 | int family = nfmsg->nfgen_family; | |
1143 | int err; | |
1144 | ||
1145 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1146 | struct netlink_dump_control c = { | |
1147 | .dump = nf_tables_dump_chains, | |
1148 | }; | |
1149 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1150 | } | |
1151 | ||
99633ab2 | 1152 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1153 | if (IS_ERR(afi)) |
1154 | return PTR_ERR(afi); | |
1155 | ||
f2a6d766 | 1156 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1157 | if (IS_ERR(table)) |
1158 | return PTR_ERR(table); | |
1159 | ||
664b0f8c | 1160 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1161 | if (IS_ERR(chain)) |
1162 | return PTR_ERR(chain); | |
1163 | ||
1164 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1165 | if (!skb2) | |
1166 | return -ENOMEM; | |
1167 | ||
84d7fce6 | 1168 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1169 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1170 | family, table, chain); | |
1171 | if (err < 0) | |
1172 | goto err; | |
1173 | ||
1174 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1175 | ||
1176 | err: | |
1177 | kfree_skb(skb2); | |
1178 | return err; | |
1179 | } | |
1180 | ||
0ca743a5 PNA |
1181 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1182 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1183 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1184 | }; | |
1185 | ||
ff3cd7b3 | 1186 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1187 | { |
1188 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1189 | struct nft_stats __percpu *newstats; | |
1190 | struct nft_stats *stats; | |
1191 | int err; | |
1192 | ||
fceb6435 JB |
1193 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy, |
1194 | NULL); | |
0ca743a5 | 1195 | if (err < 0) |
ff3cd7b3 | 1196 | return ERR_PTR(err); |
0ca743a5 PNA |
1197 | |
1198 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1199 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1200 | |
ce355e20 | 1201 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1202 | if (newstats == NULL) |
ff3cd7b3 | 1203 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1204 | |
1205 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1206 | * are not exposed to userspace. | |
1207 | */ | |
e8781f70 | 1208 | preempt_disable(); |
0ca743a5 PNA |
1209 | stats = this_cpu_ptr(newstats); |
1210 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1211 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1212 | preempt_enable(); |
0ca743a5 | 1213 | |
ff3cd7b3 PNA |
1214 | return newstats; |
1215 | } | |
1216 | ||
1217 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
1218 | struct nft_stats __percpu *newstats) | |
1219 | { | |
b88825de PNA |
1220 | if (newstats == NULL) |
1221 | return; | |
1222 | ||
0ca743a5 | 1223 | if (chain->stats) { |
0ca743a5 | 1224 | struct nft_stats __percpu *oldstats = |
67a8fc27 | 1225 | nft_dereference(chain->stats); |
0ca743a5 PNA |
1226 | |
1227 | rcu_assign_pointer(chain->stats, newstats); | |
1228 | synchronize_rcu(); | |
1229 | free_percpu(oldstats); | |
1230 | } else | |
1231 | rcu_assign_pointer(chain->stats, newstats); | |
0ca743a5 PNA |
1232 | } |
1233 | ||
91c7b38d PNA |
1234 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
1235 | { | |
1236 | BUG_ON(chain->use > 0); | |
1237 | ||
f323d954 | 1238 | if (nft_is_base_chain(chain)) { |
2cbce139 PNA |
1239 | struct nft_base_chain *basechain = nft_base_chain(chain); |
1240 | ||
1241 | module_put(basechain->type->owner); | |
1242 | free_percpu(basechain->stats); | |
1243 | if (basechain->ops[0].dev != NULL) | |
1244 | dev_put(basechain->ops[0].dev); | |
1245 | kfree(basechain); | |
91c7b38d PNA |
1246 | } else { |
1247 | kfree(chain); | |
1248 | } | |
1249 | } | |
1250 | ||
508f8ccd PNA |
1251 | struct nft_chain_hook { |
1252 | u32 num; | |
1253 | u32 priority; | |
1254 | const struct nf_chain_type *type; | |
1255 | struct net_device *dev; | |
1256 | }; | |
1257 | ||
1258 | static int nft_chain_parse_hook(struct net *net, | |
1259 | const struct nlattr * const nla[], | |
1260 | struct nft_af_info *afi, | |
1261 | struct nft_chain_hook *hook, bool create) | |
1262 | { | |
1263 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; | |
1264 | const struct nf_chain_type *type; | |
1265 | struct net_device *dev; | |
1266 | int err; | |
1267 | ||
1268 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
fceb6435 | 1269 | nft_hook_policy, NULL); |
508f8ccd PNA |
1270 | if (err < 0) |
1271 | return err; | |
1272 | ||
1273 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1274 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1275 | return -EINVAL; | |
1276 | ||
1277 | hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
1278 | if (hook->num >= afi->nhooks) | |
1279 | return -EINVAL; | |
1280 | ||
1281 | hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); | |
1282 | ||
1283 | type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT]; | |
1284 | if (nla[NFTA_CHAIN_TYPE]) { | |
1285 | type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE], | |
1286 | create); | |
1287 | if (IS_ERR(type)) | |
1288 | return PTR_ERR(type); | |
1289 | } | |
1290 | if (!(type->hook_mask & (1 << hook->num))) | |
1291 | return -EOPNOTSUPP; | |
1292 | if (!try_module_get(type->owner)) | |
1293 | return -ENOENT; | |
1294 | ||
1295 | hook->type = type; | |
1296 | ||
1297 | hook->dev = NULL; | |
1298 | if (afi->flags & NFT_AF_NEEDS_DEV) { | |
1299 | char ifname[IFNAMSIZ]; | |
1300 | ||
1301 | if (!ha[NFTA_HOOK_DEV]) { | |
1302 | module_put(type->owner); | |
1303 | return -EOPNOTSUPP; | |
1304 | } | |
1305 | ||
1306 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); | |
1307 | dev = dev_get_by_name(net, ifname); | |
1308 | if (!dev) { | |
1309 | module_put(type->owner); | |
1310 | return -ENOENT; | |
1311 | } | |
1312 | hook->dev = dev; | |
1313 | } else if (ha[NFTA_HOOK_DEV]) { | |
1314 | module_put(type->owner); | |
1315 | return -EOPNOTSUPP; | |
1316 | } | |
1317 | ||
1318 | return 0; | |
1319 | } | |
1320 | ||
1321 | static void nft_chain_release_hook(struct nft_chain_hook *hook) | |
1322 | { | |
1323 | module_put(hook->type->owner); | |
1324 | if (hook->dev != NULL) | |
1325 | dev_put(hook->dev); | |
1326 | } | |
1327 | ||
633c9a84 PNA |
1328 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
1329 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1330 | const struct nlattr * const nla[], |
1331 | struct netlink_ext_ack *extack) | |
96518518 PM |
1332 | { |
1333 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1334 | const struct nlattr * uninitialized_var(name); | |
7c95f6d8 | 1335 | struct nft_af_info *afi; |
96518518 PM |
1336 | struct nft_table *table; |
1337 | struct nft_chain *chain; | |
0ca743a5 | 1338 | struct nft_base_chain *basechain = NULL; |
f2a6d766 | 1339 | u8 genmask = nft_genmask_next(net); |
96518518 | 1340 | int family = nfmsg->nfgen_family; |
57de2a0c | 1341 | u8 policy = NF_ACCEPT; |
96518518 | 1342 | u64 handle = 0; |
115a60b1 | 1343 | unsigned int i; |
ff3cd7b3 | 1344 | struct nft_stats __percpu *stats; |
96518518 PM |
1345 | int err; |
1346 | bool create; | |
91c7b38d | 1347 | struct nft_ctx ctx; |
96518518 PM |
1348 | |
1349 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1350 | ||
99633ab2 | 1351 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
1352 | if (IS_ERR(afi)) |
1353 | return PTR_ERR(afi); | |
1354 | ||
f2a6d766 | 1355 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1356 | if (IS_ERR(table)) |
1357 | return PTR_ERR(table); | |
1358 | ||
96518518 PM |
1359 | chain = NULL; |
1360 | name = nla[NFTA_CHAIN_NAME]; | |
1361 | ||
1362 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1363 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
664b0f8c | 1364 | chain = nf_tables_chain_lookup_byhandle(table, handle, genmask); |
96518518 PM |
1365 | if (IS_ERR(chain)) |
1366 | return PTR_ERR(chain); | |
1367 | } else { | |
664b0f8c | 1368 | chain = nf_tables_chain_lookup(table, name, genmask); |
96518518 PM |
1369 | if (IS_ERR(chain)) { |
1370 | if (PTR_ERR(chain) != -ENOENT) | |
1371 | return PTR_ERR(chain); | |
1372 | chain = NULL; | |
1373 | } | |
1374 | } | |
1375 | ||
57de2a0c | 1376 | if (nla[NFTA_CHAIN_POLICY]) { |
f323d954 PNA |
1377 | if (chain != NULL && |
1378 | !nft_is_base_chain(chain)) | |
d6b6cb1d PNA |
1379 | return -EOPNOTSUPP; |
1380 | ||
1381 | if (chain == NULL && | |
57de2a0c PM |
1382 | nla[NFTA_CHAIN_HOOK] == NULL) |
1383 | return -EOPNOTSUPP; | |
1384 | ||
8f46df18 | 1385 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1386 | switch (policy) { |
1387 | case NF_DROP: | |
1388 | case NF_ACCEPT: | |
1389 | break; | |
1390 | default: | |
1391 | return -EINVAL; | |
1392 | } | |
1393 | } | |
1394 | ||
96518518 | 1395 | if (chain != NULL) { |
91c7b38d PNA |
1396 | struct nft_stats *stats = NULL; |
1397 | struct nft_trans *trans; | |
1398 | ||
96518518 PM |
1399 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
1400 | return -EEXIST; | |
1401 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1402 | return -EOPNOTSUPP; | |
1403 | ||
6133740d PNA |
1404 | if (nla[NFTA_CHAIN_HOOK]) { |
1405 | struct nft_base_chain *basechain; | |
1406 | struct nft_chain_hook hook; | |
1407 | struct nf_hook_ops *ops; | |
1408 | ||
f323d954 | 1409 | if (!nft_is_base_chain(chain)) |
6133740d PNA |
1410 | return -EBUSY; |
1411 | ||
1412 | err = nft_chain_parse_hook(net, nla, afi, &hook, | |
1413 | create); | |
1414 | if (err < 0) | |
1415 | return err; | |
1416 | ||
1417 | basechain = nft_base_chain(chain); | |
1418 | if (basechain->type != hook.type) { | |
1419 | nft_chain_release_hook(&hook); | |
1420 | return -EBUSY; | |
1421 | } | |
1422 | ||
1423 | for (i = 0; i < afi->nops; i++) { | |
1424 | ops = &basechain->ops[i]; | |
1425 | if (ops->hooknum != hook.num || | |
1426 | ops->priority != hook.priority || | |
1427 | ops->dev != hook.dev) { | |
1428 | nft_chain_release_hook(&hook); | |
1429 | return -EBUSY; | |
1430 | } | |
1431 | } | |
1432 | nft_chain_release_hook(&hook); | |
1433 | } | |
1434 | ||
664b0f8c PNA |
1435 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
1436 | struct nft_chain *chain2; | |
1437 | ||
1438 | chain2 = nf_tables_chain_lookup(table, | |
1439 | nla[NFTA_CHAIN_NAME], | |
1440 | genmask); | |
1441 | if (IS_ERR(chain2)) | |
1442 | return PTR_ERR(chain2); | |
1443 | } | |
96518518 | 1444 | |
0ca743a5 | 1445 | if (nla[NFTA_CHAIN_COUNTERS]) { |
f323d954 | 1446 | if (!nft_is_base_chain(chain)) |
0ca743a5 PNA |
1447 | return -EOPNOTSUPP; |
1448 | ||
ff3cd7b3 PNA |
1449 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1450 | if (IS_ERR(stats)) | |
1451 | return PTR_ERR(stats); | |
0ca743a5 PNA |
1452 | } |
1453 | ||
633c9a84 | 1454 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
91c7b38d PNA |
1455 | trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN, |
1456 | sizeof(struct nft_trans_chain)); | |
f5553c19 PNA |
1457 | if (trans == NULL) { |
1458 | free_percpu(stats); | |
91c7b38d | 1459 | return -ENOMEM; |
f5553c19 | 1460 | } |
4401a862 | 1461 | |
91c7b38d PNA |
1462 | nft_trans_chain_stats(trans) = stats; |
1463 | nft_trans_chain_update(trans) = true; | |
4401a862 | 1464 | |
91c7b38d PNA |
1465 | if (nla[NFTA_CHAIN_POLICY]) |
1466 | nft_trans_chain_policy(trans) = policy; | |
1467 | else | |
1468 | nft_trans_chain_policy(trans) = -1; | |
96518518 | 1469 | |
91c7b38d PNA |
1470 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
1471 | nla_strlcpy(nft_trans_chain_name(trans), name, | |
1472 | NFT_CHAIN_MAXNAMELEN); | |
1473 | } | |
1474 | list_add_tail(&trans->list, &net->nft.commit_list); | |
1475 | return 0; | |
96518518 PM |
1476 | } |
1477 | ||
75820676 PM |
1478 | if (table->use == UINT_MAX) |
1479 | return -EOVERFLOW; | |
1480 | ||
96518518 | 1481 | if (nla[NFTA_CHAIN_HOOK]) { |
508f8ccd | 1482 | struct nft_chain_hook hook; |
96518518 | 1483 | struct nf_hook_ops *ops; |
9370761c | 1484 | nf_hookfn *hookfn; |
96518518 | 1485 | |
508f8ccd | 1486 | err = nft_chain_parse_hook(net, nla, afi, &hook, create); |
96518518 PM |
1487 | if (err < 0) |
1488 | return err; | |
2cbce139 | 1489 | |
96518518 | 1490 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
f5553c19 | 1491 | if (basechain == NULL) { |
508f8ccd | 1492 | nft_chain_release_hook(&hook); |
96518518 | 1493 | return -ENOMEM; |
f5553c19 | 1494 | } |
9370761c | 1495 | |
508f8ccd PNA |
1496 | if (hook.dev != NULL) |
1497 | strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ); | |
2cbce139 | 1498 | |
4401a862 | 1499 | if (nla[NFTA_CHAIN_COUNTERS]) { |
ff3cd7b3 PNA |
1500 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1501 | if (IS_ERR(stats)) { | |
508f8ccd | 1502 | nft_chain_release_hook(&hook); |
4401a862 | 1503 | kfree(basechain); |
ff3cd7b3 | 1504 | return PTR_ERR(stats); |
4401a862 | 1505 | } |
ff3cd7b3 | 1506 | basechain->stats = stats; |
4401a862 | 1507 | } else { |
ce355e20 | 1508 | stats = netdev_alloc_pcpu_stats(struct nft_stats); |
c123bb71 | 1509 | if (stats == NULL) { |
508f8ccd | 1510 | nft_chain_release_hook(&hook); |
4401a862 | 1511 | kfree(basechain); |
c123bb71 | 1512 | return -ENOMEM; |
4401a862 | 1513 | } |
ff3cd7b3 | 1514 | rcu_assign_pointer(basechain->stats, stats); |
4401a862 PM |
1515 | } |
1516 | ||
508f8ccd PNA |
1517 | hookfn = hook.type->hooks[hook.num]; |
1518 | basechain->type = hook.type; | |
96518518 PM |
1519 | chain = &basechain->chain; |
1520 | ||
115a60b1 PM |
1521 | for (i = 0; i < afi->nops; i++) { |
1522 | ops = &basechain->ops[i]; | |
1523 | ops->pf = family; | |
508f8ccd PNA |
1524 | ops->hooknum = hook.num; |
1525 | ops->priority = hook.priority; | |
115a60b1 PM |
1526 | ops->priv = chain; |
1527 | ops->hook = afi->hooks[ops->hooknum]; | |
508f8ccd | 1528 | ops->dev = hook.dev; |
115a60b1 PM |
1529 | if (hookfn) |
1530 | ops->hook = hookfn; | |
1531 | if (afi->hook_ops_init) | |
1532 | afi->hook_ops_init(ops, i); | |
1533 | } | |
96518518 PM |
1534 | |
1535 | chain->flags |= NFT_BASE_CHAIN; | |
57de2a0c | 1536 | basechain->policy = policy; |
96518518 PM |
1537 | } else { |
1538 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1539 | if (chain == NULL) | |
1540 | return -ENOMEM; | |
1541 | } | |
1542 | ||
1543 | INIT_LIST_HEAD(&chain->rules); | |
1544 | chain->handle = nf_tables_alloc_handle(table); | |
b5bc89bf | 1545 | chain->table = table; |
96518518 PM |
1546 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
1547 | ||
82bec71d | 1548 | err = nf_tables_register_hooks(net, table, chain, afi->nops); |
d8ee8f7c PNA |
1549 | if (err < 0) |
1550 | goto err1; | |
96518518 | 1551 | |
633c9a84 | 1552 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
91c7b38d PNA |
1553 | err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN); |
1554 | if (err < 0) | |
1555 | goto err2; | |
96518518 | 1556 | |
4fefee57 | 1557 | table->use++; |
e688a7f8 | 1558 | list_add_tail_rcu(&chain->list, &table->chains); |
91c7b38d PNA |
1559 | return 0; |
1560 | err2: | |
82bec71d | 1561 | nf_tables_unregister_hooks(net, table, chain, afi->nops); |
91c7b38d PNA |
1562 | err1: |
1563 | nf_tables_chain_destroy(chain); | |
1564 | return err; | |
96518518 PM |
1565 | } |
1566 | ||
633c9a84 PNA |
1567 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
1568 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1569 | const struct nlattr * const nla[], |
1570 | struct netlink_ext_ack *extack) | |
96518518 PM |
1571 | { |
1572 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1573 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 1574 | struct nft_af_info *afi; |
96518518 PM |
1575 | struct nft_table *table; |
1576 | struct nft_chain *chain; | |
1577 | int family = nfmsg->nfgen_family; | |
91c7b38d | 1578 | struct nft_ctx ctx; |
96518518 | 1579 | |
99633ab2 | 1580 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1581 | if (IS_ERR(afi)) |
1582 | return PTR_ERR(afi); | |
1583 | ||
f2a6d766 | 1584 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1585 | if (IS_ERR(table)) |
1586 | return PTR_ERR(table); | |
1587 | ||
664b0f8c | 1588 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1589 | if (IS_ERR(chain)) |
1590 | return PTR_ERR(chain); | |
4fefee57 | 1591 | if (chain->use > 0) |
96518518 PM |
1592 | return -EBUSY; |
1593 | ||
633c9a84 | 1594 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0165d932 | 1595 | |
ee01d542 | 1596 | return nft_delchain(&ctx); |
96518518 PM |
1597 | } |
1598 | ||
96518518 PM |
1599 | /* |
1600 | * Expressions | |
1601 | */ | |
1602 | ||
1603 | /** | |
ef1f7df9 PM |
1604 | * nft_register_expr - register nf_tables expr type |
1605 | * @ops: expr type | |
96518518 | 1606 | * |
ef1f7df9 | 1607 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1608 | * success or a negative errno code otherwise. |
1609 | */ | |
ef1f7df9 | 1610 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1611 | { |
1612 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1613 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1614 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1615 | else |
e688a7f8 | 1616 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1617 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1618 | return 0; | |
1619 | } | |
1620 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1621 | ||
1622 | /** | |
ef1f7df9 PM |
1623 | * nft_unregister_expr - unregister nf_tables expr type |
1624 | * @ops: expr type | |
96518518 | 1625 | * |
ef1f7df9 | 1626 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1627 | */ |
ef1f7df9 | 1628 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1629 | { |
1630 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1631 | list_del_rcu(&type->list); |
96518518 PM |
1632 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1633 | } | |
1634 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1635 | ||
64d46806 PM |
1636 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1637 | struct nlattr *nla) | |
96518518 | 1638 | { |
ef1f7df9 | 1639 | const struct nft_expr_type *type; |
96518518 | 1640 | |
ef1f7df9 | 1641 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1642 | if (!nla_strcmp(nla, type->name) && |
1643 | (!type->family || type->family == family)) | |
ef1f7df9 | 1644 | return type; |
96518518 PM |
1645 | } |
1646 | return NULL; | |
1647 | } | |
1648 | ||
64d46806 PM |
1649 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1650 | struct nlattr *nla) | |
96518518 | 1651 | { |
ef1f7df9 | 1652 | const struct nft_expr_type *type; |
96518518 PM |
1653 | |
1654 | if (nla == NULL) | |
1655 | return ERR_PTR(-EINVAL); | |
1656 | ||
64d46806 | 1657 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1658 | if (type != NULL && try_module_get(type->owner)) |
1659 | return type; | |
96518518 PM |
1660 | |
1661 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1662 | if (type == NULL) { |
64d46806 PM |
1663 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1664 | request_module("nft-expr-%u-%.*s", family, | |
1665 | nla_len(nla), (char *)nla_data(nla)); | |
1666 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1667 | if (__nft_expr_type_get(family, nla)) | |
1668 | return ERR_PTR(-EAGAIN); | |
1669 | ||
96518518 PM |
1670 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1671 | request_module("nft-expr-%.*s", | |
1672 | nla_len(nla), (char *)nla_data(nla)); | |
1673 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1674 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1675 | return ERR_PTR(-EAGAIN); |
1676 | } | |
1677 | #endif | |
1678 | return ERR_PTR(-ENOENT); | |
1679 | } | |
1680 | ||
1681 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1682 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1683 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1684 | }; | |
1685 | ||
1686 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1687 | const struct nft_expr *expr) | |
1688 | { | |
ef1f7df9 | 1689 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1690 | goto nla_put_failure; |
1691 | ||
1692 | if (expr->ops->dump) { | |
1693 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1694 | if (data == NULL) | |
1695 | goto nla_put_failure; | |
1696 | if (expr->ops->dump(skb, expr) < 0) | |
1697 | goto nla_put_failure; | |
1698 | nla_nest_end(skb, data); | |
1699 | } | |
1700 | ||
1701 | return skb->len; | |
1702 | ||
1703 | nla_put_failure: | |
1704 | return -1; | |
1705 | }; | |
1706 | ||
0b2d8a7b PM |
1707 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
1708 | const struct nft_expr *expr) | |
1709 | { | |
1710 | struct nlattr *nest; | |
1711 | ||
1712 | nest = nla_nest_start(skb, attr); | |
1713 | if (!nest) | |
1714 | goto nla_put_failure; | |
1715 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1716 | goto nla_put_failure; | |
1717 | nla_nest_end(skb, nest); | |
1718 | return 0; | |
1719 | ||
1720 | nla_put_failure: | |
1721 | return -1; | |
1722 | } | |
1723 | ||
96518518 PM |
1724 | struct nft_expr_info { |
1725 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1726 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1727 | }; |
1728 | ||
0ca743a5 PNA |
1729 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1730 | const struct nlattr *nla, | |
96518518 PM |
1731 | struct nft_expr_info *info) |
1732 | { | |
ef1f7df9 | 1733 | const struct nft_expr_type *type; |
96518518 | 1734 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1735 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1736 | int err; |
1737 | ||
fceb6435 | 1738 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL); |
96518518 PM |
1739 | if (err < 0) |
1740 | return err; | |
1741 | ||
64d46806 | 1742 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1743 | if (IS_ERR(type)) |
1744 | return PTR_ERR(type); | |
1745 | ||
1746 | if (tb[NFTA_EXPR_DATA]) { | |
1747 | err = nla_parse_nested(info->tb, type->maxattr, | |
fceb6435 | 1748 | tb[NFTA_EXPR_DATA], type->policy, NULL); |
ef1f7df9 PM |
1749 | if (err < 0) |
1750 | goto err1; | |
1751 | } else | |
1752 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1753 | ||
1754 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1755 | ops = type->select_ops(ctx, |
1756 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1757 | if (IS_ERR(ops)) { |
1758 | err = PTR_ERR(ops); | |
1759 | goto err1; | |
1760 | } | |
1761 | } else | |
1762 | ops = type->ops; | |
1763 | ||
96518518 PM |
1764 | info->ops = ops; |
1765 | return 0; | |
ef1f7df9 PM |
1766 | |
1767 | err1: | |
1768 | module_put(type->owner); | |
1769 | return err; | |
96518518 PM |
1770 | } |
1771 | ||
1772 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1773 | const struct nft_expr_info *info, |
96518518 PM |
1774 | struct nft_expr *expr) |
1775 | { | |
1776 | const struct nft_expr_ops *ops = info->ops; | |
1777 | int err; | |
1778 | ||
1779 | expr->ops = ops; | |
1780 | if (ops->init) { | |
ef1f7df9 | 1781 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1782 | if (err < 0) |
1783 | goto err1; | |
1784 | } | |
1785 | ||
c56e3956 LZ |
1786 | if (ops->validate) { |
1787 | const struct nft_data *data = NULL; | |
1788 | ||
1789 | err = ops->validate(ctx, expr, &data); | |
1790 | if (err < 0) | |
1791 | goto err2; | |
1792 | } | |
1793 | ||
96518518 PM |
1794 | return 0; |
1795 | ||
c56e3956 LZ |
1796 | err2: |
1797 | if (ops->destroy) | |
1798 | ops->destroy(ctx, expr); | |
96518518 PM |
1799 | err1: |
1800 | expr->ops = NULL; | |
1801 | return err; | |
1802 | } | |
1803 | ||
62472bce PM |
1804 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1805 | struct nft_expr *expr) | |
96518518 PM |
1806 | { |
1807 | if (expr->ops->destroy) | |
62472bce | 1808 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1809 | module_put(expr->ops->type->owner); |
96518518 PM |
1810 | } |
1811 | ||
0b2d8a7b PM |
1812 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
1813 | const struct nlattr *nla) | |
1814 | { | |
1815 | struct nft_expr_info info; | |
1816 | struct nft_expr *expr; | |
1817 | int err; | |
1818 | ||
1819 | err = nf_tables_expr_parse(ctx, nla, &info); | |
1820 | if (err < 0) | |
1821 | goto err1; | |
1822 | ||
1823 | err = -ENOMEM; | |
1824 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
1825 | if (expr == NULL) | |
1826 | goto err2; | |
1827 | ||
1828 | err = nf_tables_newexpr(ctx, &info, expr); | |
1829 | if (err < 0) | |
6cafaf47 | 1830 | goto err3; |
0b2d8a7b PM |
1831 | |
1832 | return expr; | |
6cafaf47 LZ |
1833 | err3: |
1834 | kfree(expr); | |
0b2d8a7b PM |
1835 | err2: |
1836 | module_put(info.ops->type->owner); | |
1837 | err1: | |
1838 | return ERR_PTR(err); | |
1839 | } | |
1840 | ||
1841 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
1842 | { | |
1843 | nf_tables_expr_destroy(ctx, expr); | |
1844 | kfree(expr); | |
1845 | } | |
1846 | ||
96518518 PM |
1847 | /* |
1848 | * Rules | |
1849 | */ | |
1850 | ||
1851 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1852 | u64 handle) | |
1853 | { | |
1854 | struct nft_rule *rule; | |
1855 | ||
1856 | // FIXME: this sucks | |
1857 | list_for_each_entry(rule, &chain->rules, list) { | |
1858 | if (handle == rule->handle) | |
1859 | return rule; | |
1860 | } | |
1861 | ||
1862 | return ERR_PTR(-ENOENT); | |
1863 | } | |
1864 | ||
1865 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1866 | const struct nlattr *nla) | |
1867 | { | |
1868 | if (nla == NULL) | |
1869 | return ERR_PTR(-EINVAL); | |
1870 | ||
1871 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1872 | } | |
1873 | ||
1874 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
b2fbd044 LZ |
1875 | [NFTA_RULE_TABLE] = { .type = NLA_STRING, |
1876 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
1877 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
1878 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1879 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1880 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1881 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1882 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1883 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1884 | .len = NFT_USERDATA_MAXLEN }, | |
96518518 PM |
1885 | }; |
1886 | ||
84d7fce6 PNA |
1887 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
1888 | u32 portid, u32 seq, int event, | |
1889 | u32 flags, int family, | |
96518518 PM |
1890 | const struct nft_table *table, |
1891 | const struct nft_chain *chain, | |
1892 | const struct nft_rule *rule) | |
1893 | { | |
1894 | struct nlmsghdr *nlh; | |
1895 | struct nfgenmsg *nfmsg; | |
1896 | const struct nft_expr *expr, *next; | |
1897 | struct nlattr *list; | |
5e948466 | 1898 | const struct nft_rule *prule; |
dedb67c4 | 1899 | u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 | 1900 | |
dedb67c4 | 1901 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags); |
96518518 PM |
1902 | if (nlh == NULL) |
1903 | goto nla_put_failure; | |
1904 | ||
1905 | nfmsg = nlmsg_data(nlh); | |
1906 | nfmsg->nfgen_family = family; | |
1907 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1908 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1909 | |
1910 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1911 | goto nla_put_failure; | |
1912 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1913 | goto nla_put_failure; | |
b46f6ded ND |
1914 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), |
1915 | NFTA_RULE_PAD)) | |
96518518 PM |
1916 | goto nla_put_failure; |
1917 | ||
5e948466 | 1918 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
cbbb40e2 | 1919 | prule = list_prev_entry(rule, list); |
5e948466 | 1920 | if (nla_put_be64(skb, NFTA_RULE_POSITION, |
b46f6ded ND |
1921 | cpu_to_be64(prule->handle), |
1922 | NFTA_RULE_PAD)) | |
5e948466 EL |
1923 | goto nla_put_failure; |
1924 | } | |
1925 | ||
96518518 PM |
1926 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
1927 | if (list == NULL) | |
1928 | goto nla_put_failure; | |
1929 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 1930 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 1931 | goto nla_put_failure; |
96518518 PM |
1932 | } |
1933 | nla_nest_end(skb, list); | |
1934 | ||
86f1ec32 PM |
1935 | if (rule->udata) { |
1936 | struct nft_userdata *udata = nft_userdata(rule); | |
1937 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
1938 | udata->data) < 0) | |
1939 | goto nla_put_failure; | |
1940 | } | |
0768b3b3 | 1941 | |
053c095a JB |
1942 | nlmsg_end(skb, nlh); |
1943 | return 0; | |
96518518 PM |
1944 | |
1945 | nla_put_failure: | |
1946 | nlmsg_trim(skb, nlh); | |
1947 | return -1; | |
1948 | } | |
1949 | ||
25e94a99 PNA |
1950 | static void nf_tables_rule_notify(const struct nft_ctx *ctx, |
1951 | const struct nft_rule *rule, int event) | |
96518518 PM |
1952 | { |
1953 | struct sk_buff *skb; | |
96518518 PM |
1954 | int err; |
1955 | ||
128ad332 PNA |
1956 | if (!ctx->report && |
1957 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 1958 | return; |
96518518 | 1959 | |
96518518 PM |
1960 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1961 | if (skb == NULL) | |
1962 | goto err; | |
1963 | ||
84d7fce6 PNA |
1964 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
1965 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1966 | ctx->chain, rule); |
96518518 PM |
1967 | if (err < 0) { |
1968 | kfree_skb(skb); | |
1969 | goto err; | |
1970 | } | |
1971 | ||
25e94a99 PNA |
1972 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1973 | ctx->report, GFP_KERNEL); | |
1974 | return; | |
96518518 | 1975 | err: |
25e94a99 | 1976 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
1977 | } |
1978 | ||
6e1f760e PNA |
1979 | struct nft_rule_dump_ctx { |
1980 | char table[NFT_TABLE_MAXNAMELEN]; | |
1981 | char chain[NFT_CHAIN_MAXNAMELEN]; | |
1982 | }; | |
1983 | ||
96518518 PM |
1984 | static int nf_tables_dump_rules(struct sk_buff *skb, |
1985 | struct netlink_callback *cb) | |
1986 | { | |
1987 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
6e1f760e | 1988 | const struct nft_rule_dump_ctx *ctx = cb->data; |
96518518 PM |
1989 | const struct nft_af_info *afi; |
1990 | const struct nft_table *table; | |
1991 | const struct nft_chain *chain; | |
1992 | const struct nft_rule *rule; | |
1993 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1994 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1995 | int family = nfmsg->nfgen_family; |
1996 | ||
e688a7f8 | 1997 | rcu_read_lock(); |
38e029f1 PNA |
1998 | cb->seq = net->nft.base_seq; |
1999 | ||
e688a7f8 | 2000 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
2001 | if (family != NFPROTO_UNSPEC && family != afi->family) |
2002 | continue; | |
2003 | ||
e688a7f8 | 2004 | list_for_each_entry_rcu(table, &afi->tables, list) { |
6e1f760e PNA |
2005 | if (ctx && ctx->table[0] && |
2006 | strcmp(ctx->table, table->name) != 0) | |
2007 | continue; | |
2008 | ||
e688a7f8 | 2009 | list_for_each_entry_rcu(chain, &table->chains, list) { |
6e1f760e PNA |
2010 | if (ctx && ctx->chain[0] && |
2011 | strcmp(ctx->chain, chain->name) != 0) | |
2012 | continue; | |
2013 | ||
e688a7f8 | 2014 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
889f7ee7 | 2015 | if (!nft_is_active(net, rule)) |
0628b123 | 2016 | goto cont; |
96518518 PM |
2017 | if (idx < s_idx) |
2018 | goto cont; | |
2019 | if (idx > s_idx) | |
2020 | memset(&cb->args[1], 0, | |
2021 | sizeof(cb->args) - sizeof(cb->args[0])); | |
84d7fce6 | 2022 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, |
96518518 PM |
2023 | cb->nlh->nlmsg_seq, |
2024 | NFT_MSG_NEWRULE, | |
2025 | NLM_F_MULTI | NLM_F_APPEND, | |
2026 | afi->family, table, chain, rule) < 0) | |
2027 | goto done; | |
38e029f1 PNA |
2028 | |
2029 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
2030 | cont: |
2031 | idx++; | |
2032 | } | |
2033 | } | |
2034 | } | |
2035 | } | |
2036 | done: | |
e688a7f8 PNA |
2037 | rcu_read_unlock(); |
2038 | ||
96518518 PM |
2039 | cb->args[0] = idx; |
2040 | return skb->len; | |
2041 | } | |
2042 | ||
6e1f760e PNA |
2043 | static int nf_tables_dump_rules_done(struct netlink_callback *cb) |
2044 | { | |
2045 | kfree(cb->data); | |
2046 | return 0; | |
2047 | } | |
2048 | ||
7b8002a1 PNA |
2049 | static int nf_tables_getrule(struct net *net, struct sock *nlsk, |
2050 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2051 | const struct nlattr * const nla[], |
2052 | struct netlink_ext_ack *extack) | |
96518518 PM |
2053 | { |
2054 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2055 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
2056 | const struct nft_af_info *afi; |
2057 | const struct nft_table *table; | |
2058 | const struct nft_chain *chain; | |
2059 | const struct nft_rule *rule; | |
2060 | struct sk_buff *skb2; | |
2061 | int family = nfmsg->nfgen_family; | |
2062 | int err; | |
2063 | ||
2064 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2065 | struct netlink_dump_control c = { | |
2066 | .dump = nf_tables_dump_rules, | |
6e1f760e | 2067 | .done = nf_tables_dump_rules_done, |
96518518 | 2068 | }; |
6e1f760e PNA |
2069 | |
2070 | if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { | |
2071 | struct nft_rule_dump_ctx *ctx; | |
2072 | ||
2073 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
2074 | if (!ctx) | |
2075 | return -ENOMEM; | |
2076 | ||
2077 | if (nla[NFTA_RULE_TABLE]) | |
2078 | nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE], | |
2079 | sizeof(ctx->table)); | |
2080 | if (nla[NFTA_RULE_CHAIN]) | |
2081 | nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN], | |
2082 | sizeof(ctx->chain)); | |
2083 | c.data = ctx; | |
2084 | } | |
2085 | ||
96518518 PM |
2086 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2087 | } | |
2088 | ||
99633ab2 | 2089 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2090 | if (IS_ERR(afi)) |
2091 | return PTR_ERR(afi); | |
2092 | ||
f2a6d766 | 2093 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2094 | if (IS_ERR(table)) |
2095 | return PTR_ERR(table); | |
2096 | ||
664b0f8c | 2097 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2098 | if (IS_ERR(chain)) |
2099 | return PTR_ERR(chain); | |
2100 | ||
2101 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
2102 | if (IS_ERR(rule)) | |
2103 | return PTR_ERR(rule); | |
2104 | ||
2105 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2106 | if (!skb2) | |
2107 | return -ENOMEM; | |
2108 | ||
84d7fce6 | 2109 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
2110 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
2111 | family, table, chain, rule); | |
2112 | if (err < 0) | |
2113 | goto err; | |
2114 | ||
2115 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2116 | ||
2117 | err: | |
2118 | kfree_skb(skb2); | |
2119 | return err; | |
2120 | } | |
2121 | ||
62472bce PM |
2122 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
2123 | struct nft_rule *rule) | |
96518518 | 2124 | { |
96518518 PM |
2125 | struct nft_expr *expr; |
2126 | ||
2127 | /* | |
2128 | * Careful: some expressions might not be initialized in case this | |
2129 | * is called on error from nf_tables_newrule(). | |
2130 | */ | |
2131 | expr = nft_expr_first(rule); | |
3e38df13 | 2132 | while (expr != nft_expr_last(rule) && expr->ops) { |
62472bce | 2133 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
2134 | expr = nft_expr_next(expr); |
2135 | } | |
2136 | kfree(rule); | |
2137 | } | |
2138 | ||
1081d11b PNA |
2139 | #define NFT_RULE_MAXEXPRS 128 |
2140 | ||
2141 | static struct nft_expr_info *info; | |
2142 | ||
633c9a84 PNA |
2143 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
2144 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2145 | const struct nlattr * const nla[], |
2146 | struct netlink_ext_ack *extack) | |
96518518 PM |
2147 | { |
2148 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2149 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2150 | struct nft_af_info *afi; |
96518518 PM |
2151 | struct nft_table *table; |
2152 | struct nft_chain *chain; | |
2153 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 2154 | struct nft_userdata *udata; |
1081d11b | 2155 | struct nft_trans *trans = NULL; |
96518518 PM |
2156 | struct nft_expr *expr; |
2157 | struct nft_ctx ctx; | |
2158 | struct nlattr *tmp; | |
86f1ec32 | 2159 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 PM |
2160 | int err, rem; |
2161 | bool create; | |
5e948466 | 2162 | u64 handle, pos_handle; |
96518518 PM |
2163 | |
2164 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
2165 | ||
99633ab2 | 2166 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
2167 | if (IS_ERR(afi)) |
2168 | return PTR_ERR(afi); | |
2169 | ||
f2a6d766 | 2170 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2171 | if (IS_ERR(table)) |
2172 | return PTR_ERR(table); | |
2173 | ||
664b0f8c | 2174 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2175 | if (IS_ERR(chain)) |
2176 | return PTR_ERR(chain); | |
2177 | ||
2178 | if (nla[NFTA_RULE_HANDLE]) { | |
2179 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
2180 | rule = __nf_tables_rule_lookup(chain, handle); | |
2181 | if (IS_ERR(rule)) | |
2182 | return PTR_ERR(rule); | |
2183 | ||
2184 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2185 | return -EEXIST; | |
2186 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2187 | old_rule = rule; | |
2188 | else | |
2189 | return -EOPNOTSUPP; | |
2190 | } else { | |
2191 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
2192 | return -EINVAL; | |
2193 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
2194 | |
2195 | if (chain->use == UINT_MAX) | |
2196 | return -EOVERFLOW; | |
96518518 PM |
2197 | } |
2198 | ||
5e948466 EL |
2199 | if (nla[NFTA_RULE_POSITION]) { |
2200 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2201 | return -EOPNOTSUPP; | |
2202 | ||
2203 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
2204 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
2205 | if (IS_ERR(old_rule)) | |
2206 | return PTR_ERR(old_rule); | |
2207 | } | |
2208 | ||
633c9a84 | 2209 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0ca743a5 | 2210 | |
96518518 PM |
2211 | n = 0; |
2212 | size = 0; | |
2213 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2214 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
2215 | err = -EINVAL; | |
2216 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2217 | goto err1; | |
2218 | if (n == NFT_RULE_MAXEXPRS) | |
2219 | goto err1; | |
0ca743a5 | 2220 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2221 | if (err < 0) |
2222 | goto err1; | |
2223 | size += info[n].ops->size; | |
2224 | n++; | |
2225 | } | |
2226 | } | |
9889840f PM |
2227 | /* Check for overflow of dlen field */ |
2228 | err = -EFBIG; | |
2229 | if (size >= 1 << 12) | |
2230 | goto err1; | |
96518518 | 2231 | |
86f1ec32 | 2232 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2233 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2234 | if (ulen > 0) |
2235 | usize = sizeof(struct nft_userdata) + ulen; | |
2236 | } | |
0768b3b3 | 2237 | |
96518518 | 2238 | err = -ENOMEM; |
86f1ec32 | 2239 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2240 | if (rule == NULL) |
2241 | goto err1; | |
2242 | ||
889f7ee7 | 2243 | nft_activate_next(net, rule); |
0628b123 | 2244 | |
96518518 PM |
2245 | rule->handle = handle; |
2246 | rule->dlen = size; | |
86f1ec32 | 2247 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2248 | |
86f1ec32 PM |
2249 | if (ulen) { |
2250 | udata = nft_userdata(rule); | |
2251 | udata->len = ulen - 1; | |
2252 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2253 | } | |
96518518 | 2254 | |
96518518 PM |
2255 | expr = nft_expr_first(rule); |
2256 | for (i = 0; i < n; i++) { | |
2257 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2258 | if (err < 0) | |
2259 | goto err2; | |
ef1f7df9 | 2260 | info[i].ops = NULL; |
96518518 PM |
2261 | expr = nft_expr_next(expr); |
2262 | } | |
2263 | ||
96518518 | 2264 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
889f7ee7 | 2265 | if (nft_is_active_next(net, old_rule)) { |
ac904ac8 | 2266 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
b380e5c7 | 2267 | old_rule); |
1081d11b | 2268 | if (trans == NULL) { |
0628b123 PNA |
2269 | err = -ENOMEM; |
2270 | goto err2; | |
2271 | } | |
889f7ee7 | 2272 | nft_deactivate_next(net, old_rule); |
ac34b861 | 2273 | chain->use--; |
5bc5c307 | 2274 | list_add_tail_rcu(&rule->list, &old_rule->list); |
0628b123 PNA |
2275 | } else { |
2276 | err = -ENOENT; | |
2277 | goto err2; | |
2278 | } | |
96518518 | 2279 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
2280 | if (old_rule) |
2281 | list_add_rcu(&rule->list, &old_rule->list); | |
2282 | else | |
2283 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2284 | else { | |
2285 | if (old_rule) | |
2286 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2287 | else | |
2288 | list_add_rcu(&rule->list, &chain->rules); | |
2289 | } | |
96518518 | 2290 | |
b380e5c7 | 2291 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
0628b123 PNA |
2292 | err = -ENOMEM; |
2293 | goto err3; | |
2294 | } | |
4fefee57 | 2295 | chain->use++; |
96518518 PM |
2296 | return 0; |
2297 | ||
0628b123 PNA |
2298 | err3: |
2299 | list_del_rcu(&rule->list); | |
96518518 | 2300 | err2: |
62472bce | 2301 | nf_tables_rule_destroy(&ctx, rule); |
96518518 PM |
2302 | err1: |
2303 | for (i = 0; i < n; i++) { | |
2304 | if (info[i].ops != NULL) | |
ef1f7df9 | 2305 | module_put(info[i].ops->type->owner); |
96518518 PM |
2306 | } |
2307 | return err; | |
2308 | } | |
2309 | ||
1a94e38d PNA |
2310 | static struct nft_rule *nft_rule_lookup_byid(const struct net *net, |
2311 | const struct nlattr *nla) | |
2312 | { | |
2313 | u32 id = ntohl(nla_get_be32(nla)); | |
2314 | struct nft_trans *trans; | |
2315 | ||
2316 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
2317 | struct nft_rule *rule = nft_trans_rule(trans); | |
2318 | ||
2319 | if (trans->msg_type == NFT_MSG_NEWRULE && | |
2320 | id == nft_trans_rule_id(trans)) | |
2321 | return rule; | |
2322 | } | |
2323 | return ERR_PTR(-ENOENT); | |
2324 | } | |
2325 | ||
633c9a84 PNA |
2326 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
2327 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2328 | const struct nlattr * const nla[], |
2329 | struct netlink_ext_ack *extack) | |
96518518 PM |
2330 | { |
2331 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2332 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2333 | struct nft_af_info *afi; |
7c95f6d8 | 2334 | struct nft_table *table; |
cf9dc09d PNA |
2335 | struct nft_chain *chain = NULL; |
2336 | struct nft_rule *rule; | |
0628b123 PNA |
2337 | int family = nfmsg->nfgen_family, err = 0; |
2338 | struct nft_ctx ctx; | |
96518518 | 2339 | |
99633ab2 | 2340 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2341 | if (IS_ERR(afi)) |
2342 | return PTR_ERR(afi); | |
2343 | ||
f2a6d766 | 2344 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2345 | if (IS_ERR(table)) |
2346 | return PTR_ERR(table); | |
2347 | ||
cf9dc09d | 2348 | if (nla[NFTA_RULE_CHAIN]) { |
664b0f8c PNA |
2349 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], |
2350 | genmask); | |
cf9dc09d PNA |
2351 | if (IS_ERR(chain)) |
2352 | return PTR_ERR(chain); | |
2353 | } | |
96518518 | 2354 | |
633c9a84 | 2355 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0628b123 | 2356 | |
cf9dc09d PNA |
2357 | if (chain) { |
2358 | if (nla[NFTA_RULE_HANDLE]) { | |
2359 | rule = nf_tables_rule_lookup(chain, | |
2360 | nla[NFTA_RULE_HANDLE]); | |
2361 | if (IS_ERR(rule)) | |
2362 | return PTR_ERR(rule); | |
96518518 | 2363 | |
1a94e38d PNA |
2364 | err = nft_delrule(&ctx, rule); |
2365 | } else if (nla[NFTA_RULE_ID]) { | |
2366 | rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]); | |
2367 | if (IS_ERR(rule)) | |
2368 | return PTR_ERR(rule); | |
2369 | ||
5e266fe7 | 2370 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2371 | } else { |
ce24b721 | 2372 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2373 | } |
2374 | } else { | |
2375 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
2376 | if (!nft_is_active_next(net, chain)) |
2377 | continue; | |
2378 | ||
cf9dc09d | 2379 | ctx.chain = chain; |
ce24b721 | 2380 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2381 | if (err < 0) |
2382 | break; | |
2383 | } | |
2384 | } | |
2385 | ||
2386 | return err; | |
2387 | } | |
2388 | ||
20a69341 PM |
2389 | /* |
2390 | * Sets | |
2391 | */ | |
2392 | ||
2b664957 | 2393 | static LIST_HEAD(nf_tables_set_types); |
20a69341 | 2394 | |
2b664957 | 2395 | int nft_register_set(struct nft_set_type *type) |
20a69341 PM |
2396 | { |
2397 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2398 | list_add_tail_rcu(&type->list, &nf_tables_set_types); |
20a69341 PM |
2399 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2400 | return 0; | |
2401 | } | |
2402 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2403 | ||
2b664957 | 2404 | void nft_unregister_set(struct nft_set_type *type) |
20a69341 PM |
2405 | { |
2406 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2407 | list_del_rcu(&type->list); |
20a69341 PM |
2408 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2409 | } | |
2410 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2411 | ||
2b664957 PNA |
2412 | #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ |
2413 | NFT_SET_TIMEOUT | NFT_SET_OBJECT) | |
2414 | ||
2415 | static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags) | |
2416 | { | |
2417 | return (flags & ops->features) == (flags & NFT_SET_FEATURES); | |
2418 | } | |
2419 | ||
c50b960c PM |
2420 | /* |
2421 | * Select a set implementation based on the data characteristics and the | |
2422 | * given policy. The total memory use might not be known if no size is | |
2423 | * given, in that case the amount of memory per element is used. | |
2424 | */ | |
2425 | static const struct nft_set_ops * | |
2b664957 PNA |
2426 | nft_select_set_ops(const struct nft_ctx *ctx, |
2427 | const struct nlattr * const nla[], | |
c50b960c PM |
2428 | const struct nft_set_desc *desc, |
2429 | enum nft_set_policies policy) | |
20a69341 | 2430 | { |
c50b960c PM |
2431 | const struct nft_set_ops *ops, *bops; |
2432 | struct nft_set_estimate est, best; | |
2b664957 PNA |
2433 | const struct nft_set_type *type; |
2434 | u32 flags = 0; | |
20a69341 PM |
2435 | |
2436 | #ifdef CONFIG_MODULES | |
2b664957 | 2437 | if (list_empty(&nf_tables_set_types)) { |
20a69341 PM |
2438 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2439 | request_module("nft-set"); | |
2440 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2441 | if (!list_empty(&nf_tables_set_types)) |
20a69341 PM |
2442 | return ERR_PTR(-EAGAIN); |
2443 | } | |
2444 | #endif | |
2b664957 PNA |
2445 | if (nla[NFTA_SET_FLAGS] != NULL) |
2446 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
20a69341 | 2447 | |
55af753c PNA |
2448 | bops = NULL; |
2449 | best.size = ~0; | |
2450 | best.lookup = ~0; | |
0b5a7874 | 2451 | best.space = ~0; |
c50b960c | 2452 | |
2b664957 PNA |
2453 | list_for_each_entry(type, &nf_tables_set_types, list) { |
2454 | if (!type->select_ops) | |
2455 | ops = type->ops; | |
2456 | else | |
2457 | ops = type->select_ops(ctx, desc, flags); | |
2458 | if (!ops) | |
2459 | continue; | |
2460 | ||
2461 | if (!nft_set_ops_candidate(ops, flags)) | |
20a69341 | 2462 | continue; |
2b664957 | 2463 | if (!ops->estimate(desc, flags, &est)) |
c50b960c PM |
2464 | continue; |
2465 | ||
2466 | switch (policy) { | |
2467 | case NFT_SET_POL_PERFORMANCE: | |
55af753c | 2468 | if (est.lookup < best.lookup) |
c50b960c | 2469 | break; |
0b5a7874 PNA |
2470 | if (est.lookup == best.lookup) { |
2471 | if (!desc->size) { | |
2472 | if (est.space < best.space) | |
2473 | break; | |
2474 | } else if (est.size < best.size) { | |
2475 | break; | |
2476 | } | |
2477 | } | |
c50b960c PM |
2478 | continue; |
2479 | case NFT_SET_POL_MEMORY: | |
0b5a7874 PNA |
2480 | if (!desc->size) { |
2481 | if (est.space < best.space) | |
2482 | break; | |
2483 | if (est.space == best.space && | |
2484 | est.lookup < best.lookup) | |
2485 | break; | |
2486 | } else if (est.size < best.size) { | |
c50b960c | 2487 | break; |
0b5a7874 | 2488 | } |
c50b960c PM |
2489 | continue; |
2490 | default: | |
2491 | break; | |
2492 | } | |
2493 | ||
2b664957 | 2494 | if (!try_module_get(type->owner)) |
20a69341 | 2495 | continue; |
c50b960c | 2496 | if (bops != NULL) |
2b664957 | 2497 | module_put(bops->type->owner); |
c50b960c PM |
2498 | |
2499 | bops = ops; | |
2500 | best = est; | |
20a69341 PM |
2501 | } |
2502 | ||
c50b960c PM |
2503 | if (bops != NULL) |
2504 | return bops; | |
2505 | ||
20a69341 PM |
2506 | return ERR_PTR(-EOPNOTSUPP); |
2507 | } | |
2508 | ||
2509 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
b2fbd044 LZ |
2510 | [NFTA_SET_TABLE] = { .type = NLA_STRING, |
2511 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
a9bdd836 | 2512 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
cb39ad8b | 2513 | .len = NFT_SET_MAXNAMELEN - 1 }, |
20a69341 PM |
2514 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2515 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2516 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2517 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2518 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2519 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2520 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2521 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2522 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2523 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
e6d8ecac CFG |
2524 | [NFTA_SET_USERDATA] = { .type = NLA_BINARY, |
2525 | .len = NFT_USERDATA_MAXLEN }, | |
8aeff920 | 2526 | [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, |
c50b960c PM |
2527 | }; |
2528 | ||
2529 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2530 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2531 | }; |
2532 | ||
633c9a84 | 2533 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
2534 | const struct sk_buff *skb, |
2535 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
2536 | const struct nlattr * const nla[], |
2537 | u8 genmask) | |
20a69341 PM |
2538 | { |
2539 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
2540 | struct nft_af_info *afi = NULL; |
2541 | struct nft_table *table = NULL; | |
20a69341 | 2542 | |
c9c8e485 PNA |
2543 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
2544 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
2545 | if (IS_ERR(afi)) | |
2546 | return PTR_ERR(afi); | |
2547 | } | |
20a69341 PM |
2548 | |
2549 | if (nla[NFTA_SET_TABLE] != NULL) { | |
ec2c9935 PM |
2550 | if (afi == NULL) |
2551 | return -EAFNOSUPPORT; | |
2552 | ||
f2a6d766 PNA |
2553 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], |
2554 | genmask); | |
20a69341 PM |
2555 | if (IS_ERR(table)) |
2556 | return PTR_ERR(table); | |
2557 | } | |
2558 | ||
633c9a84 | 2559 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2560 | return 0; |
2561 | } | |
2562 | ||
c7a72e3f PNA |
2563 | static struct nft_set *nf_tables_set_lookup(const struct nft_table *table, |
2564 | const struct nlattr *nla, u8 genmask) | |
20a69341 PM |
2565 | { |
2566 | struct nft_set *set; | |
2567 | ||
2568 | if (nla == NULL) | |
2569 | return ERR_PTR(-EINVAL); | |
2570 | ||
2571 | list_for_each_entry(set, &table->sets, list) { | |
37a9cc52 PNA |
2572 | if (!nla_strcmp(nla, set->name) && |
2573 | nft_active_genmask(set, genmask)) | |
20a69341 PM |
2574 | return set; |
2575 | } | |
2576 | return ERR_PTR(-ENOENT); | |
2577 | } | |
2578 | ||
c7a72e3f PNA |
2579 | static struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
2580 | const struct nlattr *nla, | |
2581 | u8 genmask) | |
958bee14 PNA |
2582 | { |
2583 | struct nft_trans *trans; | |
2584 | u32 id = ntohl(nla_get_be32(nla)); | |
2585 | ||
2586 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
37a9cc52 PNA |
2587 | struct nft_set *set = nft_trans_set(trans); |
2588 | ||
958bee14 | 2589 | if (trans->msg_type == NFT_MSG_NEWSET && |
37a9cc52 PNA |
2590 | id == nft_trans_set_id(trans) && |
2591 | nft_active_genmask(set, genmask)) | |
2592 | return set; | |
958bee14 PNA |
2593 | } |
2594 | return ERR_PTR(-ENOENT); | |
2595 | } | |
c7a72e3f PNA |
2596 | |
2597 | struct nft_set *nft_set_lookup(const struct net *net, | |
2598 | const struct nft_table *table, | |
2599 | const struct nlattr *nla_set_name, | |
2600 | const struct nlattr *nla_set_id, | |
2601 | u8 genmask) | |
2602 | { | |
2603 | struct nft_set *set; | |
2604 | ||
2605 | set = nf_tables_set_lookup(table, nla_set_name, genmask); | |
2606 | if (IS_ERR(set)) { | |
2607 | if (!nla_set_id) | |
2608 | return set; | |
2609 | ||
2610 | set = nf_tables_set_lookup_byid(net, nla_set_id, genmask); | |
2611 | } | |
2612 | return set; | |
2613 | } | |
2614 | EXPORT_SYMBOL_GPL(nft_set_lookup); | |
958bee14 | 2615 | |
20a69341 PM |
2616 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
2617 | const char *name) | |
2618 | { | |
2619 | const struct nft_set *i; | |
2620 | const char *p; | |
2621 | unsigned long *inuse; | |
60eb1894 | 2622 | unsigned int n = 0, min = 0; |
20a69341 | 2623 | |
cb39ad8b | 2624 | p = strnchr(name, NFT_SET_MAXNAMELEN, '%'); |
20a69341 PM |
2625 | if (p != NULL) { |
2626 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2627 | return -EINVAL; | |
2628 | ||
2629 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2630 | if (inuse == NULL) | |
2631 | return -ENOMEM; | |
60eb1894 | 2632 | cont: |
20a69341 | 2633 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2634 | int tmp; |
2635 | ||
37a9cc52 PNA |
2636 | if (!nft_is_active_next(ctx->net, set)) |
2637 | continue; | |
14662917 | 2638 | if (!sscanf(i->name, name, &tmp)) |
20a69341 | 2639 | continue; |
60eb1894 | 2640 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2641 | continue; |
14662917 | 2642 | |
60eb1894 | 2643 | set_bit(tmp - min, inuse); |
20a69341 PM |
2644 | } |
2645 | ||
53b70287 | 2646 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2647 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2648 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2649 | memset(inuse, 0, PAGE_SIZE); | |
2650 | goto cont; | |
2651 | } | |
20a69341 PM |
2652 | free_page((unsigned long)inuse); |
2653 | } | |
2654 | ||
60eb1894 | 2655 | snprintf(set->name, sizeof(set->name), name, min + n); |
20a69341 | 2656 | list_for_each_entry(i, &ctx->table->sets, list) { |
37a9cc52 PNA |
2657 | if (!nft_is_active_next(ctx->net, i)) |
2658 | continue; | |
20a69341 PM |
2659 | if (!strcmp(set->name, i->name)) |
2660 | return -ENFILE; | |
2661 | } | |
2662 | return 0; | |
2663 | } | |
2664 | ||
2665 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2666 | const struct nft_set *set, u16 event, u16 flags) | |
2667 | { | |
2668 | struct nfgenmsg *nfmsg; | |
2669 | struct nlmsghdr *nlh; | |
c50b960c | 2670 | struct nlattr *desc; |
128ad332 PNA |
2671 | u32 portid = ctx->portid; |
2672 | u32 seq = ctx->seq; | |
20a69341 | 2673 | |
dedb67c4 | 2674 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
20a69341 PM |
2675 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
2676 | flags); | |
2677 | if (nlh == NULL) | |
2678 | goto nla_put_failure; | |
2679 | ||
2680 | nfmsg = nlmsg_data(nlh); | |
2681 | nfmsg->nfgen_family = ctx->afi->family; | |
2682 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2683 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
2684 | |
2685 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2686 | goto nla_put_failure; | |
2687 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2688 | goto nla_put_failure; | |
2689 | if (set->flags != 0) | |
2690 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2691 | goto nla_put_failure; | |
2692 | ||
2693 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2694 | goto nla_put_failure; | |
2695 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2696 | goto nla_put_failure; | |
2697 | if (set->flags & NFT_SET_MAP) { | |
2698 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2699 | goto nla_put_failure; | |
2700 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2701 | goto nla_put_failure; | |
2702 | } | |
8aeff920 PNA |
2703 | if (set->flags & NFT_SET_OBJECT && |
2704 | nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) | |
2705 | goto nla_put_failure; | |
20a69341 | 2706 | |
761da293 | 2707 | if (set->timeout && |
d3e2a111 AP |
2708 | nla_put_be64(skb, NFTA_SET_TIMEOUT, |
2709 | cpu_to_be64(jiffies_to_msecs(set->timeout)), | |
b46f6ded | 2710 | NFTA_SET_PAD)) |
761da293 PM |
2711 | goto nla_put_failure; |
2712 | if (set->gc_int && | |
2713 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
2714 | goto nla_put_failure; | |
2715 | ||
9363dc4b AB |
2716 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
2717 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
2718 | goto nla_put_failure; | |
2719 | } | |
2720 | ||
e6d8ecac CFG |
2721 | if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) |
2722 | goto nla_put_failure; | |
2723 | ||
c50b960c PM |
2724 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
2725 | if (desc == NULL) | |
2726 | goto nla_put_failure; | |
2727 | if (set->size && | |
2728 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
2729 | goto nla_put_failure; | |
2730 | nla_nest_end(skb, desc); | |
2731 | ||
053c095a JB |
2732 | nlmsg_end(skb, nlh); |
2733 | return 0; | |
20a69341 PM |
2734 | |
2735 | nla_put_failure: | |
2736 | nlmsg_trim(skb, nlh); | |
2737 | return -1; | |
2738 | } | |
2739 | ||
25e94a99 PNA |
2740 | static void nf_tables_set_notify(const struct nft_ctx *ctx, |
2741 | const struct nft_set *set, int event, | |
2742 | gfp_t gfp_flags) | |
20a69341 PM |
2743 | { |
2744 | struct sk_buff *skb; | |
128ad332 | 2745 | u32 portid = ctx->portid; |
20a69341 PM |
2746 | int err; |
2747 | ||
128ad332 PNA |
2748 | if (!ctx->report && |
2749 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 2750 | return; |
20a69341 | 2751 | |
31f8441c | 2752 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
2753 | if (skb == NULL) |
2754 | goto err; | |
2755 | ||
2756 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2757 | if (err < 0) { | |
2758 | kfree_skb(skb); | |
2759 | goto err; | |
2760 | } | |
2761 | ||
25e94a99 PNA |
2762 | nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report, |
2763 | gfp_flags); | |
2764 | return; | |
20a69341 | 2765 | err: |
25e94a99 | 2766 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
20a69341 PM |
2767 | } |
2768 | ||
5b96af77 | 2769 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
2770 | { |
2771 | const struct nft_set *set; | |
2772 | unsigned int idx, s_idx = cb->args[0]; | |
7c95f6d8 | 2773 | struct nft_af_info *afi; |
c9c8e485 PNA |
2774 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2775 | struct net *net = sock_net(skb->sk); | |
2776 | int cur_family = cb->args[3]; | |
5b96af77 | 2777 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
2778 | |
2779 | if (cb->args[1]) | |
2780 | return skb->len; | |
2781 | ||
e688a7f8 | 2782 | rcu_read_lock(); |
38e029f1 PNA |
2783 | cb->seq = net->nft.base_seq; |
2784 | ||
e688a7f8 | 2785 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
5b96af77 PNA |
2786 | if (ctx->afi && ctx->afi != afi) |
2787 | continue; | |
2788 | ||
c9c8e485 PNA |
2789 | if (cur_family) { |
2790 | if (afi->family != cur_family) | |
2791 | continue; | |
2792 | ||
2793 | cur_family = 0; | |
2794 | } | |
e688a7f8 | 2795 | list_for_each_entry_rcu(table, &afi->tables, list) { |
5b96af77 PNA |
2796 | if (ctx->table && ctx->table != table) |
2797 | continue; | |
2798 | ||
c9c8e485 PNA |
2799 | if (cur_table) { |
2800 | if (cur_table != table) | |
2801 | continue; | |
2802 | ||
2803 | cur_table = NULL; | |
2804 | } | |
c9c8e485 | 2805 | idx = 0; |
5b96af77 | 2806 | list_for_each_entry_rcu(set, &table->sets, list) { |
c9c8e485 PNA |
2807 | if (idx < s_idx) |
2808 | goto cont; | |
37a9cc52 PNA |
2809 | if (!nft_is_active(net, set)) |
2810 | goto cont; | |
5b96af77 PNA |
2811 | |
2812 | ctx_set = *ctx; | |
2813 | ctx_set.table = table; | |
2814 | ctx_set.afi = afi; | |
2815 | if (nf_tables_fill_set(skb, &ctx_set, set, | |
c9c8e485 PNA |
2816 | NFT_MSG_NEWSET, |
2817 | NLM_F_MULTI) < 0) { | |
2818 | cb->args[0] = idx; | |
2819 | cb->args[2] = (unsigned long) table; | |
2820 | cb->args[3] = afi->family; | |
2821 | goto done; | |
2822 | } | |
38e029f1 | 2823 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 PNA |
2824 | cont: |
2825 | idx++; | |
2826 | } | |
2827 | if (s_idx) | |
2828 | s_idx = 0; | |
2829 | } | |
2830 | } | |
2831 | cb->args[1] = 1; | |
2832 | done: | |
e688a7f8 | 2833 | rcu_read_unlock(); |
c9c8e485 PNA |
2834 | return skb->len; |
2835 | } | |
2836 | ||
5b96af77 | 2837 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 2838 | { |
5b96af77 PNA |
2839 | kfree(cb->data); |
2840 | return 0; | |
20a69341 PM |
2841 | } |
2842 | ||
7b8002a1 PNA |
2843 | static int nf_tables_getset(struct net *net, struct sock *nlsk, |
2844 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2845 | const struct nlattr * const nla[], |
2846 | struct netlink_ext_ack *extack) | |
20a69341 | 2847 | { |
f2a6d766 | 2848 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
2849 | const struct nft_set *set; |
2850 | struct nft_ctx ctx; | |
2851 | struct sk_buff *skb2; | |
c9c8e485 | 2852 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2853 | int err; |
2854 | ||
01cfa0a4 | 2855 | /* Verify existence before starting dump */ |
f2a6d766 | 2856 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
2857 | if (err < 0) |
2858 | return err; | |
2859 | ||
2860 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2861 | struct netlink_dump_control c = { | |
2862 | .dump = nf_tables_dump_sets, | |
5b96af77 | 2863 | .done = nf_tables_dump_sets_done, |
20a69341 | 2864 | }; |
5b96af77 PNA |
2865 | struct nft_ctx *ctx_dump; |
2866 | ||
2867 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); | |
2868 | if (ctx_dump == NULL) | |
2869 | return -ENOMEM; | |
2870 | ||
2871 | *ctx_dump = ctx; | |
2872 | c.data = ctx_dump; | |
2873 | ||
20a69341 PM |
2874 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2875 | } | |
2876 | ||
c9c8e485 PNA |
2877 | /* Only accept unspec with dump */ |
2878 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2879 | return -EAFNOSUPPORT; | |
eaa2bcd6 PT |
2880 | if (!nla[NFTA_SET_TABLE]) |
2881 | return -EINVAL; | |
c9c8e485 | 2882 | |
37a9cc52 | 2883 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
2884 | if (IS_ERR(set)) |
2885 | return PTR_ERR(set); | |
2886 | ||
2887 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2888 | if (skb2 == NULL) | |
2889 | return -ENOMEM; | |
2890 | ||
2891 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2892 | if (err < 0) | |
2893 | goto err; | |
2894 | ||
2895 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2896 | ||
2897 | err: | |
2898 | kfree_skb(skb2); | |
2899 | return err; | |
2900 | } | |
2901 | ||
c50b960c PM |
2902 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
2903 | struct nft_set_desc *desc, | |
2904 | const struct nlattr *nla) | |
2905 | { | |
2906 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
2907 | int err; | |
2908 | ||
fceb6435 JB |
2909 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, |
2910 | nft_set_desc_policy, NULL); | |
c50b960c PM |
2911 | if (err < 0) |
2912 | return err; | |
2913 | ||
2914 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
2915 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
2916 | ||
2917 | return 0; | |
2918 | } | |
2919 | ||
633c9a84 PNA |
2920 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
2921 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2922 | const struct nlattr * const nla[], |
2923 | struct netlink_ext_ack *extack) | |
20a69341 PM |
2924 | { |
2925 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2926 | u8 genmask = nft_genmask_next(net); |
20a69341 | 2927 | const struct nft_set_ops *ops; |
7c95f6d8 | 2928 | struct nft_af_info *afi; |
20a69341 PM |
2929 | struct nft_table *table; |
2930 | struct nft_set *set; | |
2931 | struct nft_ctx ctx; | |
cb39ad8b | 2932 | char name[NFT_SET_MAXNAMELEN]; |
20a69341 PM |
2933 | unsigned int size; |
2934 | bool create; | |
761da293 | 2935 | u64 timeout; |
8aeff920 | 2936 | u32 ktype, dtype, flags, policy, gc_int, objtype; |
c50b960c | 2937 | struct nft_set_desc desc; |
e6d8ecac CFG |
2938 | unsigned char *udata; |
2939 | u16 udlen; | |
20a69341 PM |
2940 | int err; |
2941 | ||
2942 | if (nla[NFTA_SET_TABLE] == NULL || | |
2943 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
2944 | nla[NFTA_SET_KEY_LEN] == NULL || |
2945 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
2946 | return -EINVAL; |
2947 | ||
c50b960c PM |
2948 | memset(&desc, 0, sizeof(desc)); |
2949 | ||
20a69341 PM |
2950 | ktype = NFT_DATA_VALUE; |
2951 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
2952 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
2953 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
2954 | return -EINVAL; | |
2955 | } | |
2956 | ||
c50b960c | 2957 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 2958 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
2959 | return -EINVAL; |
2960 | ||
2961 | flags = 0; | |
2962 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2963 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
2964 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 | 2965 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
8aeff920 PNA |
2966 | NFT_SET_MAP | NFT_SET_EVAL | |
2967 | NFT_SET_OBJECT)) | |
20a69341 | 2968 | return -EINVAL; |
8aeff920 PNA |
2969 | /* Only one of these operations is supported */ |
2970 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) == | |
2971 | (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) | |
7c6c6e95 | 2972 | return -EOPNOTSUPP; |
20a69341 PM |
2973 | } |
2974 | ||
2975 | dtype = 0; | |
20a69341 PM |
2976 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
2977 | if (!(flags & NFT_SET_MAP)) | |
2978 | return -EINVAL; | |
2979 | ||
2980 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
2981 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
2982 | dtype != NFT_DATA_VERDICT) | |
2983 | return -EINVAL; | |
2984 | ||
2985 | if (dtype != NFT_DATA_VERDICT) { | |
2986 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
2987 | return -EINVAL; | |
c50b960c | 2988 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 2989 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
2990 | return -EINVAL; |
2991 | } else | |
7d740264 | 2992 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
2993 | } else if (flags & NFT_SET_MAP) |
2994 | return -EINVAL; | |
2995 | ||
8aeff920 PNA |
2996 | if (nla[NFTA_SET_OBJ_TYPE] != NULL) { |
2997 | if (!(flags & NFT_SET_OBJECT)) | |
2998 | return -EINVAL; | |
2999 | ||
3000 | objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); | |
3001 | if (objtype == NFT_OBJECT_UNSPEC || | |
3002 | objtype > NFT_OBJECT_MAX) | |
3003 | return -EINVAL; | |
3004 | } else if (flags & NFT_SET_OBJECT) | |
3005 | return -EINVAL; | |
3006 | else | |
3007 | objtype = NFT_OBJECT_UNSPEC; | |
3008 | ||
761da293 PM |
3009 | timeout = 0; |
3010 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
3011 | if (!(flags & NFT_SET_TIMEOUT)) | |
3012 | return -EINVAL; | |
d3e2a111 AP |
3013 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3014 | nla[NFTA_SET_TIMEOUT]))); | |
761da293 PM |
3015 | } |
3016 | gc_int = 0; | |
3017 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
3018 | if (!(flags & NFT_SET_TIMEOUT)) | |
3019 | return -EINVAL; | |
3020 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
3021 | } | |
3022 | ||
c50b960c PM |
3023 | policy = NFT_SET_POL_PERFORMANCE; |
3024 | if (nla[NFTA_SET_POLICY] != NULL) | |
3025 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
3026 | ||
3027 | if (nla[NFTA_SET_DESC] != NULL) { | |
3028 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
3029 | if (err < 0) | |
3030 | return err; | |
3031 | } | |
3032 | ||
20a69341 PM |
3033 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
3034 | ||
99633ab2 | 3035 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
3036 | if (IS_ERR(afi)) |
3037 | return PTR_ERR(afi); | |
3038 | ||
f2a6d766 | 3039 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask); |
20a69341 PM |
3040 | if (IS_ERR(table)) |
3041 | return PTR_ERR(table); | |
3042 | ||
633c9a84 | 3043 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 | 3044 | |
37a9cc52 | 3045 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3046 | if (IS_ERR(set)) { |
3047 | if (PTR_ERR(set) != -ENOENT) | |
3048 | return PTR_ERR(set); | |
1a28ad74 | 3049 | } else { |
20a69341 PM |
3050 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
3051 | return -EEXIST; | |
3052 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
3053 | return -EOPNOTSUPP; | |
3054 | return 0; | |
3055 | } | |
3056 | ||
3057 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
3058 | return -ENOENT; | |
3059 | ||
2b664957 | 3060 | ops = nft_select_set_ops(&ctx, nla, &desc, policy); |
20a69341 PM |
3061 | if (IS_ERR(ops)) |
3062 | return PTR_ERR(ops); | |
3063 | ||
e6d8ecac CFG |
3064 | udlen = 0; |
3065 | if (nla[NFTA_SET_USERDATA]) | |
3066 | udlen = nla_len(nla[NFTA_SET_USERDATA]); | |
3067 | ||
20a69341 PM |
3068 | size = 0; |
3069 | if (ops->privsize != NULL) | |
347b408d | 3070 | size = ops->privsize(nla, &desc); |
20a69341 | 3071 | |
1ff75a3e PNA |
3072 | set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); |
3073 | if (!set) { | |
3074 | err = -ENOMEM; | |
20a69341 | 3075 | goto err1; |
1ff75a3e | 3076 | } |
20a69341 PM |
3077 | |
3078 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); | |
3079 | err = nf_tables_set_alloc_name(&ctx, set, name); | |
3080 | if (err < 0) | |
3081 | goto err2; | |
3082 | ||
e6d8ecac CFG |
3083 | udata = NULL; |
3084 | if (udlen) { | |
3085 | udata = set->data + size; | |
3086 | nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); | |
3087 | } | |
3088 | ||
20a69341 PM |
3089 | INIT_LIST_HEAD(&set->bindings); |
3090 | set->ops = ops; | |
3091 | set->ktype = ktype; | |
c50b960c | 3092 | set->klen = desc.klen; |
20a69341 | 3093 | set->dtype = dtype; |
8aeff920 | 3094 | set->objtype = objtype; |
c50b960c | 3095 | set->dlen = desc.dlen; |
20a69341 | 3096 | set->flags = flags; |
c50b960c | 3097 | set->size = desc.size; |
9363dc4b | 3098 | set->policy = policy; |
e6d8ecac CFG |
3099 | set->udlen = udlen; |
3100 | set->udata = udata; | |
761da293 PM |
3101 | set->timeout = timeout; |
3102 | set->gc_int = gc_int; | |
20a69341 | 3103 | |
c50b960c | 3104 | err = ops->init(set, &desc, nla); |
20a69341 PM |
3105 | if (err < 0) |
3106 | goto err2; | |
3107 | ||
958bee14 | 3108 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 | 3109 | if (err < 0) |
c17c3cdf | 3110 | goto err3; |
20a69341 | 3111 | |
e688a7f8 | 3112 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 3113 | table->use++; |
20a69341 PM |
3114 | return 0; |
3115 | ||
c17c3cdf LZ |
3116 | err3: |
3117 | ops->destroy(set); | |
20a69341 | 3118 | err2: |
1ff75a3e | 3119 | kvfree(set); |
20a69341 | 3120 | err1: |
2b664957 | 3121 | module_put(ops->type->owner); |
20a69341 PM |
3122 | return err; |
3123 | } | |
3124 | ||
958bee14 | 3125 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 3126 | { |
20a69341 | 3127 | set->ops->destroy(set); |
2b664957 | 3128 | module_put(set->ops->type->owner); |
1ff75a3e | 3129 | kvfree(set); |
20a69341 PM |
3130 | } |
3131 | ||
958bee14 PNA |
3132 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
3133 | { | |
e688a7f8 | 3134 | list_del_rcu(&set->list); |
31f8441c | 3135 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
3136 | nft_set_destroy(set); |
3137 | } | |
3138 | ||
633c9a84 PNA |
3139 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
3140 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3141 | const struct nlattr * const nla[], |
3142 | struct netlink_ext_ack *extack) | |
20a69341 | 3143 | { |
c9c8e485 | 3144 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
f2a6d766 | 3145 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3146 | struct nft_set *set; |
3147 | struct nft_ctx ctx; | |
3148 | int err; | |
3149 | ||
ec2c9935 PM |
3150 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
3151 | return -EAFNOSUPPORT; | |
20a69341 PM |
3152 | if (nla[NFTA_SET_TABLE] == NULL) |
3153 | return -EINVAL; | |
3154 | ||
f2a6d766 | 3155 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3156 | if (err < 0) |
3157 | return err; | |
3158 | ||
37a9cc52 | 3159 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3160 | if (IS_ERR(set)) |
3161 | return PTR_ERR(set); | |
3162 | if (!list_empty(&set->bindings)) | |
3163 | return -EBUSY; | |
3164 | ||
ee01d542 | 3165 | return nft_delset(&ctx, set); |
20a69341 PM |
3166 | } |
3167 | ||
3168 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 3169 | struct nft_set *set, |
20a69341 | 3170 | const struct nft_set_iter *iter, |
de70185d | 3171 | struct nft_set_elem *elem) |
20a69341 | 3172 | { |
fe2811eb | 3173 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3174 | enum nft_registers dreg; |
3175 | ||
3176 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
3177 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
3178 | set->dtype == NFT_DATA_VERDICT ? | |
3179 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
3180 | set->dlen); | |
20a69341 PM |
3181 | } |
3182 | ||
3183 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3184 | struct nft_set_binding *binding) | |
3185 | { | |
3186 | struct nft_set_binding *i; | |
3187 | struct nft_set_iter iter; | |
3188 | ||
3189 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
3190 | return -EBUSY; | |
3191 | ||
11113e19 | 3192 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
3193 | /* If the set is already bound to the same chain all |
3194 | * jumps are already validated for that chain. | |
3195 | */ | |
3196 | list_for_each_entry(i, &set->bindings, list) { | |
a4684402 | 3197 | if (i->flags & NFT_SET_MAP && |
11113e19 | 3198 | i->chain == binding->chain) |
20a69341 PM |
3199 | goto bind; |
3200 | } | |
3201 | ||
8588ac09 | 3202 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
3203 | iter.skip = 0; |
3204 | iter.count = 0; | |
3205 | iter.err = 0; | |
3206 | iter.fn = nf_tables_bind_check_setelem; | |
3207 | ||
3208 | set->ops->walk(ctx, set, &iter); | |
a02f4248 | 3209 | if (iter.err < 0) |
20a69341 | 3210 | return iter.err; |
20a69341 PM |
3211 | } |
3212 | bind: | |
3213 | binding->chain = ctx->chain; | |
e688a7f8 | 3214 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
3215 | return 0; |
3216 | } | |
63aea290 | 3217 | EXPORT_SYMBOL_GPL(nf_tables_bind_set); |
20a69341 PM |
3218 | |
3219 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3220 | struct nft_set_binding *binding) | |
3221 | { | |
e688a7f8 | 3222 | list_del_rcu(&binding->list); |
20a69341 | 3223 | |
958bee14 | 3224 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
37a9cc52 | 3225 | nft_is_active(ctx->net, set)) |
20a69341 PM |
3226 | nf_tables_set_destroy(ctx, set); |
3227 | } | |
63aea290 | 3228 | EXPORT_SYMBOL_GPL(nf_tables_unbind_set); |
20a69341 | 3229 | |
3ac4c07a PM |
3230 | const struct nft_set_ext_type nft_set_ext_types[] = { |
3231 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 3232 | .align = __alignof__(u32), |
3ac4c07a PM |
3233 | }, |
3234 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 3235 | .align = __alignof__(u32), |
3ac4c07a | 3236 | }, |
f25ad2e9 PM |
3237 | [NFT_SET_EXT_EXPR] = { |
3238 | .align = __alignof__(struct nft_expr), | |
3239 | }, | |
8aeff920 PNA |
3240 | [NFT_SET_EXT_OBJREF] = { |
3241 | .len = sizeof(struct nft_object *), | |
3242 | .align = __alignof__(struct nft_object *), | |
3243 | }, | |
3ac4c07a PM |
3244 | [NFT_SET_EXT_FLAGS] = { |
3245 | .len = sizeof(u8), | |
3246 | .align = __alignof__(u8), | |
3247 | }, | |
c3e1b005 PM |
3248 | [NFT_SET_EXT_TIMEOUT] = { |
3249 | .len = sizeof(u64), | |
3250 | .align = __alignof__(u64), | |
3251 | }, | |
3252 | [NFT_SET_EXT_EXPIRATION] = { | |
3253 | .len = sizeof(unsigned long), | |
3254 | .align = __alignof__(unsigned long), | |
3255 | }, | |
68e942e8 PM |
3256 | [NFT_SET_EXT_USERDATA] = { |
3257 | .len = sizeof(struct nft_userdata), | |
3258 | .align = __alignof__(struct nft_userdata), | |
3259 | }, | |
3ac4c07a PM |
3260 | }; |
3261 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
3262 | ||
20a69341 PM |
3263 | /* |
3264 | * Set elements | |
3265 | */ | |
3266 | ||
3267 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
3268 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
3269 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
3270 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 3271 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
3272 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
3273 | .len = NFT_USERDATA_MAXLEN }, | |
20a69341 PM |
3274 | }; |
3275 | ||
3276 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
b2fbd044 LZ |
3277 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, |
3278 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
3279 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, | |
3280 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
20a69341 | 3281 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
958bee14 | 3282 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
3283 | }; |
3284 | ||
633c9a84 | 3285 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
3286 | const struct sk_buff *skb, |
3287 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
3288 | const struct nlattr * const nla[], |
3289 | u8 genmask) | |
20a69341 PM |
3290 | { |
3291 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
3292 | struct nft_af_info *afi; |
3293 | struct nft_table *table; | |
20a69341 | 3294 | |
99633ab2 | 3295 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
3296 | if (IS_ERR(afi)) |
3297 | return PTR_ERR(afi); | |
3298 | ||
f2a6d766 PNA |
3299 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE], |
3300 | genmask); | |
20a69341 PM |
3301 | if (IS_ERR(table)) |
3302 | return PTR_ERR(table); | |
3303 | ||
633c9a84 | 3304 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
3305 | return 0; |
3306 | } | |
3307 | ||
3308 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
3309 | const struct nft_set *set, | |
3310 | const struct nft_set_elem *elem) | |
3311 | { | |
fe2811eb | 3312 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3313 | unsigned char *b = skb_tail_pointer(skb); |
3314 | struct nlattr *nest; | |
3315 | ||
3316 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
3317 | if (nest == NULL) | |
3318 | goto nla_put_failure; | |
3319 | ||
fe2811eb PM |
3320 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
3321 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
3322 | goto nla_put_failure; |
3323 | ||
fe2811eb PM |
3324 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3325 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
3326 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
3327 | set->dlen) < 0) | |
3328 | goto nla_put_failure; | |
3329 | ||
f25ad2e9 PM |
3330 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3331 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3332 | goto nla_put_failure; | |
3333 | ||
8aeff920 PNA |
3334 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && |
3335 | nla_put_string(skb, NFTA_SET_ELEM_OBJREF, | |
3336 | (*nft_set_ext_obj(ext))->name) < 0) | |
3337 | goto nla_put_failure; | |
3338 | ||
fe2811eb PM |
3339 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3340 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3341 | htonl(*nft_set_ext_flags(ext)))) | |
3342 | goto nla_put_failure; | |
20a69341 | 3343 | |
c3e1b005 PM |
3344 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3345 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
d3e2a111 AP |
3346 | cpu_to_be64(jiffies_to_msecs( |
3347 | *nft_set_ext_timeout(ext))), | |
b46f6ded | 3348 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3349 | goto nla_put_failure; |
3350 | ||
3351 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
3352 | unsigned long expires, now = jiffies; | |
3353 | ||
3354 | expires = *nft_set_ext_expiration(ext); | |
3355 | if (time_before(now, expires)) | |
3356 | expires -= now; | |
3357 | else | |
3358 | expires = 0; | |
3359 | ||
3360 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
b46f6ded ND |
3361 | cpu_to_be64(jiffies_to_msecs(expires)), |
3362 | NFTA_SET_ELEM_PAD)) | |
c3e1b005 PM |
3363 | goto nla_put_failure; |
3364 | } | |
3365 | ||
68e942e8 PM |
3366 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3367 | struct nft_userdata *udata; | |
3368 | ||
3369 | udata = nft_set_ext_userdata(ext); | |
3370 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3371 | udata->len + 1, udata->data)) | |
3372 | goto nla_put_failure; | |
3373 | } | |
3374 | ||
20a69341 PM |
3375 | nla_nest_end(skb, nest); |
3376 | return 0; | |
3377 | ||
3378 | nla_put_failure: | |
3379 | nlmsg_trim(skb, b); | |
3380 | return -EMSGSIZE; | |
3381 | } | |
3382 | ||
3383 | struct nft_set_dump_args { | |
3384 | const struct netlink_callback *cb; | |
3385 | struct nft_set_iter iter; | |
3386 | struct sk_buff *skb; | |
3387 | }; | |
3388 | ||
3389 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
de70185d | 3390 | struct nft_set *set, |
20a69341 | 3391 | const struct nft_set_iter *iter, |
de70185d | 3392 | struct nft_set_elem *elem) |
20a69341 PM |
3393 | { |
3394 | struct nft_set_dump_args *args; | |
3395 | ||
3396 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3397 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3398 | } | |
3399 | ||
fa803605 LZ |
3400 | struct nft_set_dump_ctx { |
3401 | const struct nft_set *set; | |
3402 | struct nft_ctx ctx; | |
3403 | }; | |
3404 | ||
20a69341 PM |
3405 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
3406 | { | |
fa803605 | 3407 | struct nft_set_dump_ctx *dump_ctx = cb->data; |
633c9a84 | 3408 | struct net *net = sock_net(skb->sk); |
fa803605 LZ |
3409 | struct nft_af_info *afi; |
3410 | struct nft_table *table; | |
de70185d | 3411 | struct nft_set *set; |
20a69341 | 3412 | struct nft_set_dump_args args; |
fa803605 | 3413 | bool set_found = false; |
20a69341 PM |
3414 | struct nfgenmsg *nfmsg; |
3415 | struct nlmsghdr *nlh; | |
3416 | struct nlattr *nest; | |
3417 | u32 portid, seq; | |
fa803605 | 3418 | int event; |
20a69341 | 3419 | |
fa803605 LZ |
3420 | rcu_read_lock(); |
3421 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
3422 | if (afi != dump_ctx->ctx.afi) | |
3423 | continue; | |
20a69341 | 3424 | |
fa803605 LZ |
3425 | list_for_each_entry_rcu(table, &afi->tables, list) { |
3426 | if (table != dump_ctx->ctx.table) | |
3427 | continue; | |
20a69341 | 3428 | |
fa803605 LZ |
3429 | list_for_each_entry_rcu(set, &table->sets, list) { |
3430 | if (set == dump_ctx->set) { | |
3431 | set_found = true; | |
3432 | break; | |
3433 | } | |
3434 | } | |
3435 | break; | |
3436 | } | |
3437 | break; | |
3438 | } | |
3439 | ||
3440 | if (!set_found) { | |
3441 | rcu_read_unlock(); | |
3442 | return -ENOENT; | |
3443 | } | |
20a69341 | 3444 | |
dedb67c4 | 3445 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); |
20a69341 PM |
3446 | portid = NETLINK_CB(cb->skb).portid; |
3447 | seq = cb->nlh->nlmsg_seq; | |
3448 | ||
3449 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3450 | NLM_F_MULTI); | |
3451 | if (nlh == NULL) | |
3452 | goto nla_put_failure; | |
3453 | ||
3454 | nfmsg = nlmsg_data(nlh); | |
fa803605 | 3455 | nfmsg->nfgen_family = afi->family; |
20a69341 | 3456 | nfmsg->version = NFNETLINK_V0; |
fa803605 | 3457 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
20a69341 | 3458 | |
fa803605 | 3459 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) |
20a69341 PM |
3460 | goto nla_put_failure; |
3461 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3462 | goto nla_put_failure; | |
3463 | ||
3464 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3465 | if (nest == NULL) | |
3466 | goto nla_put_failure; | |
3467 | ||
8588ac09 PNA |
3468 | args.cb = cb; |
3469 | args.skb = skb; | |
fa803605 | 3470 | args.iter.genmask = nft_genmask_cur(net); |
8588ac09 PNA |
3471 | args.iter.skip = cb->args[0]; |
3472 | args.iter.count = 0; | |
3473 | args.iter.err = 0; | |
3474 | args.iter.fn = nf_tables_dump_setelem; | |
fa803605 LZ |
3475 | set->ops->walk(&dump_ctx->ctx, set, &args.iter); |
3476 | rcu_read_unlock(); | |
20a69341 PM |
3477 | |
3478 | nla_nest_end(skb, nest); | |
3479 | nlmsg_end(skb, nlh); | |
3480 | ||
3481 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3482 | return args.iter.err; | |
3483 | if (args.iter.count == cb->args[0]) | |
3484 | return 0; | |
3485 | ||
3486 | cb->args[0] = args.iter.count; | |
3487 | return skb->len; | |
3488 | ||
3489 | nla_put_failure: | |
fa803605 | 3490 | rcu_read_unlock(); |
20a69341 PM |
3491 | return -ENOSPC; |
3492 | } | |
3493 | ||
fa803605 LZ |
3494 | static int nf_tables_dump_set_done(struct netlink_callback *cb) |
3495 | { | |
3496 | kfree(cb->data); | |
3497 | return 0; | |
3498 | } | |
3499 | ||
7b8002a1 PNA |
3500 | static int nf_tables_getsetelem(struct net *net, struct sock *nlsk, |
3501 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3502 | const struct nlattr * const nla[], |
3503 | struct netlink_ext_ack *extack) | |
20a69341 | 3504 | { |
f2a6d766 | 3505 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
3506 | const struct nft_set *set; |
3507 | struct nft_ctx ctx; | |
3508 | int err; | |
3509 | ||
f2a6d766 | 3510 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3511 | if (err < 0) |
3512 | return err; | |
3513 | ||
37a9cc52 PNA |
3514 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3515 | genmask); | |
20a69341 PM |
3516 | if (IS_ERR(set)) |
3517 | return PTR_ERR(set); | |
3518 | ||
3519 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3520 | struct netlink_dump_control c = { | |
3521 | .dump = nf_tables_dump_set, | |
fa803605 | 3522 | .done = nf_tables_dump_set_done, |
20a69341 | 3523 | }; |
fa803605 LZ |
3524 | struct nft_set_dump_ctx *dump_ctx; |
3525 | ||
3526 | dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL); | |
3527 | if (!dump_ctx) | |
3528 | return -ENOMEM; | |
3529 | ||
3530 | dump_ctx->set = set; | |
3531 | dump_ctx->ctx = ctx; | |
3532 | ||
3533 | c.data = dump_ctx; | |
20a69341 PM |
3534 | return netlink_dump_start(nlsk, skb, nlh, &c); |
3535 | } | |
3536 | return -EOPNOTSUPP; | |
3537 | } | |
3538 | ||
d60ce62f AB |
3539 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
3540 | const struct nft_ctx *ctx, u32 seq, | |
3541 | u32 portid, int event, u16 flags, | |
3542 | const struct nft_set *set, | |
3543 | const struct nft_set_elem *elem) | |
3544 | { | |
3545 | struct nfgenmsg *nfmsg; | |
3546 | struct nlmsghdr *nlh; | |
3547 | struct nlattr *nest; | |
3548 | int err; | |
3549 | ||
dedb67c4 | 3550 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
d60ce62f AB |
3551 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
3552 | flags); | |
3553 | if (nlh == NULL) | |
3554 | goto nla_put_failure; | |
3555 | ||
3556 | nfmsg = nlmsg_data(nlh); | |
3557 | nfmsg->nfgen_family = ctx->afi->family; | |
3558 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 3559 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
3560 | |
3561 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3562 | goto nla_put_failure; | |
3563 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3564 | goto nla_put_failure; | |
3565 | ||
3566 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3567 | if (nest == NULL) | |
3568 | goto nla_put_failure; | |
3569 | ||
3570 | err = nf_tables_fill_setelem(skb, set, elem); | |
3571 | if (err < 0) | |
3572 | goto nla_put_failure; | |
3573 | ||
3574 | nla_nest_end(skb, nest); | |
3575 | ||
053c095a JB |
3576 | nlmsg_end(skb, nlh); |
3577 | return 0; | |
d60ce62f AB |
3578 | |
3579 | nla_put_failure: | |
3580 | nlmsg_trim(skb, nlh); | |
3581 | return -1; | |
3582 | } | |
3583 | ||
25e94a99 PNA |
3584 | static void nf_tables_setelem_notify(const struct nft_ctx *ctx, |
3585 | const struct nft_set *set, | |
3586 | const struct nft_set_elem *elem, | |
3587 | int event, u16 flags) | |
d60ce62f | 3588 | { |
128ad332 PNA |
3589 | struct net *net = ctx->net; |
3590 | u32 portid = ctx->portid; | |
d60ce62f AB |
3591 | struct sk_buff *skb; |
3592 | int err; | |
3593 | ||
128ad332 | 3594 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
25e94a99 | 3595 | return; |
d60ce62f | 3596 | |
d60ce62f AB |
3597 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
3598 | if (skb == NULL) | |
3599 | goto err; | |
3600 | ||
3601 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
3602 | set, elem); | |
3603 | if (err < 0) { | |
3604 | kfree_skb(skb); | |
3605 | goto err; | |
3606 | } | |
3607 | ||
25e94a99 PNA |
3608 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
3609 | GFP_KERNEL); | |
3610 | return; | |
d60ce62f | 3611 | err: |
25e94a99 | 3612 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
d60ce62f AB |
3613 | } |
3614 | ||
60319eb1 PNA |
3615 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
3616 | int msg_type, | |
3617 | struct nft_set *set) | |
3618 | { | |
3619 | struct nft_trans *trans; | |
3620 | ||
3621 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
3622 | if (trans == NULL) | |
3623 | return NULL; | |
3624 | ||
3625 | nft_trans_elem_set(trans) = set; | |
3626 | return trans; | |
3627 | } | |
3628 | ||
22fe54d5 PM |
3629 | void *nft_set_elem_init(const struct nft_set *set, |
3630 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 3631 | const u32 *key, const u32 *data, |
22fe54d5 | 3632 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
3633 | { |
3634 | struct nft_set_ext *ext; | |
3635 | void *elem; | |
3636 | ||
3637 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
3638 | if (elem == NULL) | |
3639 | return NULL; | |
3640 | ||
3641 | ext = nft_set_elem_ext(set, elem); | |
3642 | nft_set_ext_init(ext, tmpl); | |
3643 | ||
3644 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
3645 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3646 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
3647 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
3648 | *nft_set_ext_expiration(ext) = | |
d3e2a111 | 3649 | jiffies + timeout; |
c3e1b005 PM |
3650 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) |
3651 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
3652 | |
3653 | return elem; | |
3654 | } | |
3655 | ||
61f9e292 LZ |
3656 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
3657 | bool destroy_expr) | |
61edafbb PM |
3658 | { |
3659 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3660 | ||
59105446 | 3661 | nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); |
61edafbb | 3662 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) |
59105446 | 3663 | nft_data_release(nft_set_ext_data(ext), set->dtype); |
61f9e292 | 3664 | if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) |
f25ad2e9 | 3665 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); |
8aeff920 PNA |
3666 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) |
3667 | (*nft_set_ext_obj(ext))->use--; | |
61edafbb PM |
3668 | kfree(elem); |
3669 | } | |
3670 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
3671 | ||
59105446 PNA |
3672 | /* Only called from commit path, nft_set_elem_deactivate() already deals with |
3673 | * the refcounting from the preparation phase. | |
3674 | */ | |
3675 | static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem) | |
3676 | { | |
3677 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3678 | ||
3679 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) | |
3680 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); | |
3681 | kfree(elem); | |
3682 | } | |
3683 | ||
0e9091d6 PNA |
3684 | static int nft_setelem_parse_flags(const struct nft_set *set, |
3685 | const struct nlattr *attr, u32 *flags) | |
3686 | { | |
3687 | if (attr == NULL) | |
3688 | return 0; | |
3689 | ||
3690 | *flags = ntohl(nla_get_be32(attr)); | |
3691 | if (*flags & ~NFT_SET_ELEM_INTERVAL_END) | |
3692 | return -EINVAL; | |
3693 | if (!(set->flags & NFT_SET_INTERVAL) && | |
3694 | *flags & NFT_SET_ELEM_INTERVAL_END) | |
3695 | return -EINVAL; | |
3696 | ||
3697 | return 0; | |
3698 | } | |
3699 | ||
60319eb1 | 3700 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
c016c7e4 | 3701 | const struct nlattr *attr, u32 nlmsg_flags) |
20a69341 PM |
3702 | { |
3703 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
8aeff920 | 3704 | u8 genmask = nft_genmask_next(ctx->net); |
20a69341 | 3705 | struct nft_data_desc d1, d2; |
fe2811eb | 3706 | struct nft_set_ext_tmpl tmpl; |
c016c7e4 | 3707 | struct nft_set_ext *ext, *ext2; |
20a69341 PM |
3708 | struct nft_set_elem elem; |
3709 | struct nft_set_binding *binding; | |
8aeff920 | 3710 | struct nft_object *obj = NULL; |
68e942e8 | 3711 | struct nft_userdata *udata; |
fe2811eb | 3712 | struct nft_data data; |
20a69341 | 3713 | enum nft_registers dreg; |
60319eb1 | 3714 | struct nft_trans *trans; |
0e9091d6 | 3715 | u32 flags = 0; |
c3e1b005 | 3716 | u64 timeout; |
68e942e8 | 3717 | u8 ulen; |
20a69341 PM |
3718 | int err; |
3719 | ||
3720 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 3721 | nft_set_elem_policy, NULL); |
20a69341 PM |
3722 | if (err < 0) |
3723 | return err; | |
3724 | ||
3725 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3726 | return -EINVAL; | |
3727 | ||
fe2811eb PM |
3728 | nft_set_ext_prepare(&tmpl); |
3729 | ||
0e9091d6 PNA |
3730 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); |
3731 | if (err < 0) | |
3732 | return err; | |
3733 | if (flags != 0) | |
3734 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
3735 | |
3736 | if (set->flags & NFT_SET_MAP) { | |
3737 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 3738 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 3739 | return -EINVAL; |
bd7fc645 | 3740 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 3741 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 3742 | return -EINVAL; |
20a69341 PM |
3743 | } else { |
3744 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
3745 | return -EINVAL; | |
3746 | } | |
3747 | ||
c3e1b005 PM |
3748 | timeout = 0; |
3749 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
3750 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
3751 | return -EINVAL; | |
d3e2a111 AP |
3752 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3753 | nla[NFTA_SET_ELEM_TIMEOUT]))); | |
c3e1b005 PM |
3754 | } else if (set->flags & NFT_SET_TIMEOUT) { |
3755 | timeout = set->timeout; | |
3756 | } | |
3757 | ||
7d740264 | 3758 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 3759 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3760 | if (err < 0) |
3761 | goto err1; | |
3762 | err = -EINVAL; | |
3763 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
3764 | goto err2; | |
3765 | ||
7d740264 | 3766 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
3767 | if (timeout > 0) { |
3768 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
3769 | if (timeout != set->timeout) | |
3770 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
3771 | } | |
fe2811eb | 3772 | |
8aeff920 PNA |
3773 | if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { |
3774 | if (!(set->flags & NFT_SET_OBJECT)) { | |
3775 | err = -EINVAL; | |
3776 | goto err2; | |
3777 | } | |
3778 | obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF], | |
3779 | set->objtype, genmask); | |
3780 | if (IS_ERR(obj)) { | |
3781 | err = PTR_ERR(obj); | |
3782 | goto err2; | |
3783 | } | |
3784 | nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); | |
3785 | } | |
3786 | ||
20a69341 | 3787 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
3788 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
3789 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
3790 | if (err < 0) |
3791 | goto err2; | |
3792 | ||
3793 | err = -EINVAL; | |
3794 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
3795 | goto err3; | |
3796 | ||
3797 | dreg = nft_type_to_reg(set->dtype); | |
3798 | list_for_each_entry(binding, &set->bindings, list) { | |
3799 | struct nft_ctx bind_ctx = { | |
58c78e10 | 3800 | .net = ctx->net, |
20a69341 PM |
3801 | .afi = ctx->afi, |
3802 | .table = ctx->table, | |
7c95f6d8 | 3803 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
3804 | }; |
3805 | ||
11113e19 PM |
3806 | if (!(binding->flags & NFT_SET_MAP)) |
3807 | continue; | |
3808 | ||
1ec10212 PM |
3809 | err = nft_validate_register_store(&bind_ctx, dreg, |
3810 | &data, | |
3811 | d2.type, d2.len); | |
20a69341 PM |
3812 | if (err < 0) |
3813 | goto err3; | |
3814 | } | |
fe2811eb | 3815 | |
7d740264 | 3816 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
3817 | } |
3818 | ||
68e942e8 PM |
3819 | /* The full maximum length of userdata can exceed the maximum |
3820 | * offset value (U8_MAX) for following extensions, therefor it | |
3821 | * must be the last extension added. | |
3822 | */ | |
3823 | ulen = 0; | |
3824 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
3825 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
3826 | if (ulen > 0) | |
3827 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
3828 | ulen); | |
3829 | } | |
3830 | ||
fe2811eb | 3831 | err = -ENOMEM; |
7d740264 | 3832 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 3833 | timeout, GFP_KERNEL); |
fe2811eb PM |
3834 | if (elem.priv == NULL) |
3835 | goto err3; | |
3836 | ||
3837 | ext = nft_set_elem_ext(set, elem.priv); | |
3838 | if (flags) | |
3839 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
3840 | if (ulen > 0) { |
3841 | udata = nft_set_ext_userdata(ext); | |
3842 | udata->len = ulen - 1; | |
3843 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
3844 | } | |
8aeff920 PNA |
3845 | if (obj) { |
3846 | *nft_set_ext_obj(ext) = obj; | |
3847 | obj->use++; | |
3848 | } | |
fe2811eb | 3849 | |
60319eb1 PNA |
3850 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
3851 | if (trans == NULL) | |
fe2811eb | 3852 | goto err4; |
60319eb1 | 3853 | |
69086658 | 3854 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
c016c7e4 PNA |
3855 | err = set->ops->insert(ctx->net, set, &elem, &ext2); |
3856 | if (err) { | |
3857 | if (err == -EEXIST) { | |
9744a6fc PNA |
3858 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ |
3859 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || | |
3860 | nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ | |
3861 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) | |
3862 | return -EBUSY; | |
8aeff920 PNA |
3863 | if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3864 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && | |
3865 | memcmp(nft_set_ext_data(ext), | |
3866 | nft_set_ext_data(ext2), set->dlen) != 0) || | |
3867 | (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && | |
3868 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && | |
3869 | *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) | |
c016c7e4 PNA |
3870 | err = -EBUSY; |
3871 | else if (!(nlmsg_flags & NLM_F_EXCL)) | |
3872 | err = 0; | |
3873 | } | |
fe2811eb | 3874 | goto err5; |
c016c7e4 | 3875 | } |
20a69341 | 3876 | |
35d0ac90 PNA |
3877 | if (set->size && |
3878 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { | |
3879 | err = -ENFILE; | |
3880 | goto err6; | |
3881 | } | |
3882 | ||
60319eb1 | 3883 | nft_trans_elem(trans) = elem; |
46bbafce | 3884 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
3885 | return 0; |
3886 | ||
35d0ac90 | 3887 | err6: |
5cb82a38 | 3888 | set->ops->remove(ctx->net, set, &elem); |
fe2811eb | 3889 | err5: |
60319eb1 | 3890 | kfree(trans); |
fe2811eb PM |
3891 | err4: |
3892 | kfree(elem.priv); | |
20a69341 PM |
3893 | err3: |
3894 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
59105446 | 3895 | nft_data_release(&data, d2.type); |
20a69341 | 3896 | err2: |
59105446 | 3897 | nft_data_release(&elem.key.val, d1.type); |
20a69341 PM |
3898 | err1: |
3899 | return err; | |
3900 | } | |
3901 | ||
633c9a84 PNA |
3902 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
3903 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3904 | const struct nlattr * const nla[], |
3905 | struct netlink_ext_ack *extack) | |
20a69341 | 3906 | { |
f2a6d766 | 3907 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3908 | const struct nlattr *attr; |
3909 | struct nft_set *set; | |
3910 | struct nft_ctx ctx; | |
60319eb1 | 3911 | int rem, err = 0; |
20a69341 | 3912 | |
7d5570ca PNA |
3913 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
3914 | return -EINVAL; | |
3915 | ||
f2a6d766 | 3916 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3917 | if (err < 0) |
3918 | return err; | |
3919 | ||
37a9cc52 PNA |
3920 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
3921 | genmask); | |
958bee14 PNA |
3922 | if (IS_ERR(set)) { |
3923 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { | |
3924 | set = nf_tables_set_lookup_byid(net, | |
37a9cc52 PNA |
3925 | nla[NFTA_SET_ELEM_LIST_SET_ID], |
3926 | genmask); | |
958bee14 PNA |
3927 | } |
3928 | if (IS_ERR(set)) | |
3929 | return PTR_ERR(set); | |
3930 | } | |
3931 | ||
20a69341 PM |
3932 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
3933 | return -EBUSY; | |
3934 | ||
3935 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
c016c7e4 | 3936 | err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags); |
35d0ac90 | 3937 | if (err < 0) |
60319eb1 | 3938 | break; |
20a69341 | 3939 | } |
60319eb1 | 3940 | return err; |
20a69341 PM |
3941 | } |
3942 | ||
59105446 PNA |
3943 | /** |
3944 | * nft_data_hold - hold a nft_data item | |
3945 | * | |
3946 | * @data: struct nft_data to release | |
3947 | * @type: type of data | |
3948 | * | |
3949 | * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
3950 | * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and | |
3951 | * NFT_GOTO verdicts. This function must be called on active data objects | |
3952 | * from the second phase of the commit protocol. | |
3953 | */ | |
3954 | static void nft_data_hold(const struct nft_data *data, enum nft_data_types type) | |
3955 | { | |
3956 | if (type == NFT_DATA_VERDICT) { | |
3957 | switch (data->verdict.code) { | |
3958 | case NFT_JUMP: | |
3959 | case NFT_GOTO: | |
3960 | data->verdict.chain->use++; | |
3961 | break; | |
3962 | } | |
3963 | } | |
3964 | } | |
3965 | ||
3966 | static void nft_set_elem_activate(const struct net *net, | |
3967 | const struct nft_set *set, | |
3968 | struct nft_set_elem *elem) | |
3969 | { | |
3970 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
3971 | ||
3972 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3973 | nft_data_hold(nft_set_ext_data(ext), set->dtype); | |
3974 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
3975 | (*nft_set_ext_obj(ext))->use++; | |
3976 | } | |
3977 | ||
3978 | static void nft_set_elem_deactivate(const struct net *net, | |
3979 | const struct nft_set *set, | |
3980 | struct nft_set_elem *elem) | |
3981 | { | |
3982 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
3983 | ||
3984 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3985 | nft_data_release(nft_set_ext_data(ext), set->dtype); | |
3986 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
3987 | (*nft_set_ext_obj(ext))->use--; | |
3988 | } | |
3989 | ||
60319eb1 | 3990 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
3991 | const struct nlattr *attr) |
3992 | { | |
3993 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3971ca14 | 3994 | struct nft_set_ext_tmpl tmpl; |
20a69341 PM |
3995 | struct nft_data_desc desc; |
3996 | struct nft_set_elem elem; | |
3971ca14 | 3997 | struct nft_set_ext *ext; |
60319eb1 | 3998 | struct nft_trans *trans; |
3971ca14 PNA |
3999 | u32 flags = 0; |
4000 | void *priv; | |
20a69341 PM |
4001 | int err; |
4002 | ||
4003 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 4004 | nft_set_elem_policy, NULL); |
20a69341 PM |
4005 | if (err < 0) |
4006 | goto err1; | |
4007 | ||
4008 | err = -EINVAL; | |
4009 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
4010 | goto err1; | |
4011 | ||
3971ca14 PNA |
4012 | nft_set_ext_prepare(&tmpl); |
4013 | ||
4014 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
4015 | if (err < 0) | |
4016 | return err; | |
4017 | if (flags != 0) | |
4018 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
4019 | ||
7d740264 | 4020 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 4021 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
4022 | if (err < 0) |
4023 | goto err1; | |
4024 | ||
4025 | err = -EINVAL; | |
4026 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
4027 | goto err2; | |
4028 | ||
3971ca14 PNA |
4029 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len); |
4030 | ||
4031 | err = -ENOMEM; | |
4032 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0, | |
4033 | GFP_KERNEL); | |
4034 | if (elem.priv == NULL) | |
4035 | goto err2; | |
4036 | ||
4037 | ext = nft_set_elem_ext(set, elem.priv); | |
4038 | if (flags) | |
4039 | *nft_set_ext_flags(ext) = flags; | |
4040 | ||
60319eb1 | 4041 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
4042 | if (trans == NULL) { |
4043 | err = -ENOMEM; | |
3971ca14 | 4044 | goto err3; |
609ccf08 | 4045 | } |
20a69341 | 4046 | |
42a55769 | 4047 | priv = set->ops->deactivate(ctx->net, set, &elem); |
3971ca14 | 4048 | if (priv == NULL) { |
cc02e457 | 4049 | err = -ENOENT; |
3971ca14 | 4050 | goto err4; |
cc02e457 | 4051 | } |
3971ca14 PNA |
4052 | kfree(elem.priv); |
4053 | elem.priv = priv; | |
cc02e457 | 4054 | |
59105446 PNA |
4055 | nft_set_elem_deactivate(ctx->net, set, &elem); |
4056 | ||
60319eb1 | 4057 | nft_trans_elem(trans) = elem; |
46bbafce | 4058 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 4059 | return 0; |
cc02e457 | 4060 | |
3971ca14 | 4061 | err4: |
cc02e457 | 4062 | kfree(trans); |
3971ca14 PNA |
4063 | err3: |
4064 | kfree(elem.priv); | |
20a69341 | 4065 | err2: |
59105446 | 4066 | nft_data_release(&elem.key.val, desc.type); |
20a69341 PM |
4067 | err1: |
4068 | return err; | |
4069 | } | |
4070 | ||
8411b644 | 4071 | static int nft_flush_set(const struct nft_ctx *ctx, |
de70185d | 4072 | struct nft_set *set, |
8411b644 | 4073 | const struct nft_set_iter *iter, |
de70185d | 4074 | struct nft_set_elem *elem) |
8411b644 PNA |
4075 | { |
4076 | struct nft_trans *trans; | |
4077 | int err; | |
4078 | ||
4079 | trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, | |
4080 | sizeof(struct nft_trans_elem), GFP_ATOMIC); | |
4081 | if (!trans) | |
4082 | return -ENOMEM; | |
4083 | ||
1ba1c414 | 4084 | if (!set->ops->flush(ctx->net, set, elem->priv)) { |
8411b644 PNA |
4085 | err = -ENOENT; |
4086 | goto err1; | |
4087 | } | |
b2c11e4b | 4088 | set->ndeact++; |
8411b644 | 4089 | |
de70185d PNA |
4090 | nft_trans_elem_set(trans) = set; |
4091 | nft_trans_elem(trans) = *elem; | |
8411b644 PNA |
4092 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
4093 | ||
4094 | return 0; | |
4095 | err1: | |
4096 | kfree(trans); | |
4097 | return err; | |
4098 | } | |
4099 | ||
633c9a84 PNA |
4100 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
4101 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4102 | const struct nlattr * const nla[], |
4103 | struct netlink_ext_ack *extack) | |
20a69341 | 4104 | { |
f2a6d766 | 4105 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4106 | const struct nlattr *attr; |
4107 | struct nft_set *set; | |
4108 | struct nft_ctx ctx; | |
60319eb1 | 4109 | int rem, err = 0; |
20a69341 | 4110 | |
f2a6d766 | 4111 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
4112 | if (err < 0) |
4113 | return err; | |
4114 | ||
37a9cc52 PNA |
4115 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
4116 | genmask); | |
20a69341 PM |
4117 | if (IS_ERR(set)) |
4118 | return PTR_ERR(set); | |
4119 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
4120 | return -EBUSY; | |
4121 | ||
8411b644 | 4122 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) { |
baa2d42c PNA |
4123 | struct nft_set_iter iter = { |
4124 | .genmask = genmask, | |
4125 | .fn = nft_flush_set, | |
8411b644 | 4126 | }; |
baa2d42c | 4127 | set->ops->walk(&ctx, set, &iter); |
8411b644 | 4128 | |
baa2d42c | 4129 | return iter.err; |
8411b644 PNA |
4130 | } |
4131 | ||
20a69341 PM |
4132 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
4133 | err = nft_del_setelem(&ctx, set, attr); | |
4134 | if (err < 0) | |
60319eb1 | 4135 | break; |
4fefee57 | 4136 | |
3dd0673a | 4137 | set->ndeact++; |
20a69341 | 4138 | } |
60319eb1 | 4139 | return err; |
20a69341 PM |
4140 | } |
4141 | ||
cfed7e1b PM |
4142 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
4143 | { | |
4144 | struct nft_set_gc_batch *gcb; | |
4145 | unsigned int i; | |
4146 | ||
4147 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
4148 | for (i = 0; i < gcb->head.cnt; i++) | |
61f9e292 | 4149 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); |
cfed7e1b PM |
4150 | kfree(gcb); |
4151 | } | |
4152 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
4153 | ||
4154 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
4155 | gfp_t gfp) | |
4156 | { | |
4157 | struct nft_set_gc_batch *gcb; | |
4158 | ||
4159 | gcb = kzalloc(sizeof(*gcb), gfp); | |
4160 | if (gcb == NULL) | |
4161 | return gcb; | |
4162 | gcb->head.set = set; | |
4163 | return gcb; | |
4164 | } | |
4165 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
4166 | ||
e5009240 PNA |
4167 | /* |
4168 | * Stateful objects | |
4169 | */ | |
4170 | ||
4171 | /** | |
4172 | * nft_register_obj- register nf_tables stateful object type | |
4173 | * @obj: object type | |
4174 | * | |
4175 | * Registers the object type for use with nf_tables. Returns zero on | |
4176 | * success or a negative errno code otherwise. | |
4177 | */ | |
4178 | int nft_register_obj(struct nft_object_type *obj_type) | |
4179 | { | |
4180 | if (obj_type->type == NFT_OBJECT_UNSPEC) | |
4181 | return -EINVAL; | |
4182 | ||
4183 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4184 | list_add_rcu(&obj_type->list, &nf_tables_objects); | |
4185 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4186 | return 0; | |
4187 | } | |
4188 | EXPORT_SYMBOL_GPL(nft_register_obj); | |
4189 | ||
4190 | /** | |
4191 | * nft_unregister_obj - unregister nf_tables object type | |
4192 | * @obj: object type | |
4193 | * | |
4194 | * Unregisters the object type for use with nf_tables. | |
4195 | */ | |
4196 | void nft_unregister_obj(struct nft_object_type *obj_type) | |
4197 | { | |
4198 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4199 | list_del_rcu(&obj_type->list); | |
4200 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4201 | } | |
4202 | EXPORT_SYMBOL_GPL(nft_unregister_obj); | |
4203 | ||
4204 | struct nft_object *nf_tables_obj_lookup(const struct nft_table *table, | |
4205 | const struct nlattr *nla, | |
4206 | u32 objtype, u8 genmask) | |
4207 | { | |
4208 | struct nft_object *obj; | |
4209 | ||
4210 | list_for_each_entry(obj, &table->objects, list) { | |
4211 | if (!nla_strcmp(nla, obj->name) && | |
4212 | objtype == obj->type->type && | |
4213 | nft_active_genmask(obj, genmask)) | |
4214 | return obj; | |
4215 | } | |
4216 | return ERR_PTR(-ENOENT); | |
4217 | } | |
4218 | EXPORT_SYMBOL_GPL(nf_tables_obj_lookup); | |
4219 | ||
4220 | static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { | |
b2fbd044 LZ |
4221 | [NFTA_OBJ_TABLE] = { .type = NLA_STRING, |
4222 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
4223 | [NFTA_OBJ_NAME] = { .type = NLA_STRING, | |
4224 | .len = NFT_OBJ_MAXNAMELEN - 1 }, | |
e5009240 PNA |
4225 | [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, |
4226 | [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, | |
4227 | }; | |
4228 | ||
84fba055 FW |
4229 | static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, |
4230 | const struct nft_object_type *type, | |
e5009240 PNA |
4231 | const struct nlattr *attr) |
4232 | { | |
4233 | struct nlattr *tb[type->maxattr + 1]; | |
4234 | struct nft_object *obj; | |
4235 | int err; | |
4236 | ||
4237 | if (attr) { | |
fceb6435 JB |
4238 | err = nla_parse_nested(tb, type->maxattr, attr, type->policy, |
4239 | NULL); | |
e5009240 PNA |
4240 | if (err < 0) |
4241 | goto err1; | |
4242 | } else { | |
4243 | memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); | |
4244 | } | |
4245 | ||
4246 | err = -ENOMEM; | |
4247 | obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL); | |
4248 | if (obj == NULL) | |
4249 | goto err1; | |
4250 | ||
84fba055 | 4251 | err = type->init(ctx, (const struct nlattr * const *)tb, obj); |
e5009240 PNA |
4252 | if (err < 0) |
4253 | goto err2; | |
4254 | ||
4255 | obj->type = type; | |
4256 | return obj; | |
4257 | err2: | |
4258 | kfree(obj); | |
4259 | err1: | |
4260 | return ERR_PTR(err); | |
4261 | } | |
4262 | ||
4263 | static int nft_object_dump(struct sk_buff *skb, unsigned int attr, | |
43da04a5 | 4264 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4265 | { |
4266 | struct nlattr *nest; | |
4267 | ||
4268 | nest = nla_nest_start(skb, attr); | |
4269 | if (!nest) | |
4270 | goto nla_put_failure; | |
43da04a5 | 4271 | if (obj->type->dump(skb, obj, reset) < 0) |
e5009240 PNA |
4272 | goto nla_put_failure; |
4273 | nla_nest_end(skb, nest); | |
4274 | return 0; | |
4275 | ||
4276 | nla_put_failure: | |
4277 | return -1; | |
4278 | } | |
4279 | ||
4280 | static const struct nft_object_type *__nft_obj_type_get(u32 objtype) | |
4281 | { | |
4282 | const struct nft_object_type *type; | |
4283 | ||
4284 | list_for_each_entry(type, &nf_tables_objects, list) { | |
4285 | if (objtype == type->type) | |
4286 | return type; | |
4287 | } | |
4288 | return NULL; | |
4289 | } | |
4290 | ||
4291 | static const struct nft_object_type *nft_obj_type_get(u32 objtype) | |
4292 | { | |
4293 | const struct nft_object_type *type; | |
4294 | ||
4295 | type = __nft_obj_type_get(objtype); | |
4296 | if (type != NULL && try_module_get(type->owner)) | |
4297 | return type; | |
4298 | ||
4299 | #ifdef CONFIG_MODULES | |
4300 | if (type == NULL) { | |
4301 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4302 | request_module("nft-obj-%u", objtype); | |
4303 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4304 | if (__nft_obj_type_get(objtype)) | |
4305 | return ERR_PTR(-EAGAIN); | |
4306 | } | |
4307 | #endif | |
4308 | return ERR_PTR(-ENOENT); | |
4309 | } | |
4310 | ||
4311 | static int nf_tables_newobj(struct net *net, struct sock *nlsk, | |
4312 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4313 | const struct nlattr * const nla[], |
4314 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4315 | { |
4316 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4317 | const struct nft_object_type *type; | |
4318 | u8 genmask = nft_genmask_next(net); | |
4319 | int family = nfmsg->nfgen_family; | |
4320 | struct nft_af_info *afi; | |
4321 | struct nft_table *table; | |
4322 | struct nft_object *obj; | |
4323 | struct nft_ctx ctx; | |
4324 | u32 objtype; | |
4325 | int err; | |
4326 | ||
4327 | if (!nla[NFTA_OBJ_TYPE] || | |
4328 | !nla[NFTA_OBJ_NAME] || | |
4329 | !nla[NFTA_OBJ_DATA]) | |
4330 | return -EINVAL; | |
4331 | ||
4332 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4333 | if (IS_ERR(afi)) | |
4334 | return PTR_ERR(afi); | |
4335 | ||
4336 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4337 | if (IS_ERR(table)) | |
4338 | return PTR_ERR(table); | |
4339 | ||
4340 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4341 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4342 | if (IS_ERR(obj)) { | |
4343 | err = PTR_ERR(obj); | |
4344 | if (err != -ENOENT) | |
4345 | return err; | |
4346 | ||
1a28ad74 | 4347 | } else { |
e5009240 PNA |
4348 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
4349 | return -EEXIST; | |
4350 | ||
4351 | return 0; | |
4352 | } | |
4353 | ||
4354 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4355 | ||
4356 | type = nft_obj_type_get(objtype); | |
4357 | if (IS_ERR(type)) | |
4358 | return PTR_ERR(type); | |
4359 | ||
84fba055 | 4360 | obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); |
e5009240 PNA |
4361 | if (IS_ERR(obj)) { |
4362 | err = PTR_ERR(obj); | |
4363 | goto err1; | |
4364 | } | |
18965317 | 4365 | obj->table = table; |
e5009240 PNA |
4366 | nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN); |
4367 | ||
4368 | err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); | |
4369 | if (err < 0) | |
4370 | goto err2; | |
4371 | ||
4372 | list_add_tail_rcu(&obj->list, &table->objects); | |
4373 | table->use++; | |
4374 | return 0; | |
4375 | err2: | |
4376 | if (obj->type->destroy) | |
4377 | obj->type->destroy(obj); | |
4378 | kfree(obj); | |
4379 | err1: | |
4380 | module_put(type->owner); | |
4381 | return err; | |
4382 | } | |
4383 | ||
4384 | static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, | |
4385 | u32 portid, u32 seq, int event, u32 flags, | |
4386 | int family, const struct nft_table *table, | |
43da04a5 | 4387 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4388 | { |
4389 | struct nfgenmsg *nfmsg; | |
4390 | struct nlmsghdr *nlh; | |
4391 | ||
dedb67c4 | 4392 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
e5009240 PNA |
4393 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
4394 | if (nlh == NULL) | |
4395 | goto nla_put_failure; | |
4396 | ||
4397 | nfmsg = nlmsg_data(nlh); | |
4398 | nfmsg->nfgen_family = family; | |
4399 | nfmsg->version = NFNETLINK_V0; | |
4400 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4401 | ||
4402 | if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || | |
4403 | nla_put_string(skb, NFTA_OBJ_NAME, obj->name) || | |
4404 | nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) || | |
4405 | nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || | |
43da04a5 | 4406 | nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset)) |
e5009240 PNA |
4407 | goto nla_put_failure; |
4408 | ||
4409 | nlmsg_end(skb, nlh); | |
4410 | return 0; | |
4411 | ||
4412 | nla_put_failure: | |
4413 | nlmsg_trim(skb, nlh); | |
4414 | return -1; | |
4415 | } | |
4416 | ||
a9fea2a3 PNA |
4417 | struct nft_obj_filter { |
4418 | char table[NFT_OBJ_MAXNAMELEN]; | |
4419 | u32 type; | |
4420 | }; | |
4421 | ||
e5009240 PNA |
4422 | static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) |
4423 | { | |
4424 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
4425 | const struct nft_af_info *afi; | |
4426 | const struct nft_table *table; | |
e5009240 | 4427 | unsigned int idx = 0, s_idx = cb->args[0]; |
a9fea2a3 | 4428 | struct nft_obj_filter *filter = cb->data; |
e5009240 PNA |
4429 | struct net *net = sock_net(skb->sk); |
4430 | int family = nfmsg->nfgen_family; | |
43da04a5 PNA |
4431 | struct nft_object *obj; |
4432 | bool reset = false; | |
4433 | ||
4434 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) | |
4435 | reset = true; | |
e5009240 PNA |
4436 | |
4437 | rcu_read_lock(); | |
4438 | cb->seq = net->nft.base_seq; | |
4439 | ||
4440 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
4441 | if (family != NFPROTO_UNSPEC && family != afi->family) | |
4442 | continue; | |
4443 | ||
4444 | list_for_each_entry_rcu(table, &afi->tables, list) { | |
4445 | list_for_each_entry_rcu(obj, &table->objects, list) { | |
4446 | if (!nft_is_active(net, obj)) | |
4447 | goto cont; | |
4448 | if (idx < s_idx) | |
4449 | goto cont; | |
4450 | if (idx > s_idx) | |
4451 | memset(&cb->args[1], 0, | |
4452 | sizeof(cb->args) - sizeof(cb->args[0])); | |
d21e540b | 4453 | if (filter && filter->table[0] && |
a9fea2a3 PNA |
4454 | strcmp(filter->table, table->name)) |
4455 | goto cont; | |
d21e540b LZ |
4456 | if (filter && |
4457 | filter->type != NFT_OBJECT_UNSPEC && | |
a9fea2a3 PNA |
4458 | obj->type->type != filter->type) |
4459 | goto cont; | |
4460 | ||
e5009240 PNA |
4461 | if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, |
4462 | cb->nlh->nlmsg_seq, | |
4463 | NFT_MSG_NEWOBJ, | |
4464 | NLM_F_MULTI | NLM_F_APPEND, | |
43da04a5 | 4465 | afi->family, table, obj, reset) < 0) |
e5009240 PNA |
4466 | goto done; |
4467 | ||
4468 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
4469 | cont: | |
4470 | idx++; | |
4471 | } | |
4472 | } | |
4473 | } | |
4474 | done: | |
4475 | rcu_read_unlock(); | |
4476 | ||
4477 | cb->args[0] = idx; | |
4478 | return skb->len; | |
4479 | } | |
4480 | ||
a9fea2a3 PNA |
4481 | static int nf_tables_dump_obj_done(struct netlink_callback *cb) |
4482 | { | |
4483 | kfree(cb->data); | |
4484 | ||
4485 | return 0; | |
4486 | } | |
4487 | ||
4488 | static struct nft_obj_filter * | |
4489 | nft_obj_filter_alloc(const struct nlattr * const nla[]) | |
4490 | { | |
4491 | struct nft_obj_filter *filter; | |
4492 | ||
4493 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); | |
4494 | if (!filter) | |
4495 | return ERR_PTR(-ENOMEM); | |
4496 | ||
4497 | if (nla[NFTA_OBJ_TABLE]) | |
4498 | nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE], | |
4499 | NFT_TABLE_MAXNAMELEN); | |
4500 | if (nla[NFTA_OBJ_TYPE]) | |
4501 | filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4502 | ||
4503 | return filter; | |
4504 | } | |
4505 | ||
e5009240 PNA |
4506 | static int nf_tables_getobj(struct net *net, struct sock *nlsk, |
4507 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4508 | const struct nlattr * const nla[], |
4509 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4510 | { |
4511 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4512 | u8 genmask = nft_genmask_cur(net); | |
4513 | int family = nfmsg->nfgen_family; | |
4514 | const struct nft_af_info *afi; | |
4515 | const struct nft_table *table; | |
4516 | struct nft_object *obj; | |
4517 | struct sk_buff *skb2; | |
43da04a5 | 4518 | bool reset = false; |
e5009240 PNA |
4519 | u32 objtype; |
4520 | int err; | |
4521 | ||
4522 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
4523 | struct netlink_dump_control c = { | |
4524 | .dump = nf_tables_dump_obj, | |
a9fea2a3 | 4525 | .done = nf_tables_dump_obj_done, |
e5009240 | 4526 | }; |
a9fea2a3 PNA |
4527 | |
4528 | if (nla[NFTA_OBJ_TABLE] || | |
4529 | nla[NFTA_OBJ_TYPE]) { | |
4530 | struct nft_obj_filter *filter; | |
4531 | ||
4532 | filter = nft_obj_filter_alloc(nla); | |
4533 | if (IS_ERR(filter)) | |
4534 | return -ENOMEM; | |
4535 | ||
4536 | c.data = filter; | |
4537 | } | |
e5009240 PNA |
4538 | return netlink_dump_start(nlsk, skb, nlh, &c); |
4539 | } | |
4540 | ||
4541 | if (!nla[NFTA_OBJ_NAME] || | |
4542 | !nla[NFTA_OBJ_TYPE]) | |
4543 | return -EINVAL; | |
4544 | ||
4545 | afi = nf_tables_afinfo_lookup(net, family, false); | |
4546 | if (IS_ERR(afi)) | |
4547 | return PTR_ERR(afi); | |
4548 | ||
4549 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4550 | if (IS_ERR(table)) | |
4551 | return PTR_ERR(table); | |
4552 | ||
4553 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4554 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4555 | if (IS_ERR(obj)) | |
4556 | return PTR_ERR(obj); | |
4557 | ||
4558 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4559 | if (!skb2) | |
4560 | return -ENOMEM; | |
4561 | ||
43da04a5 PNA |
4562 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) |
4563 | reset = true; | |
4564 | ||
e5009240 PNA |
4565 | err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, |
4566 | nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, | |
43da04a5 | 4567 | family, table, obj, reset); |
e5009240 PNA |
4568 | if (err < 0) |
4569 | goto err; | |
4570 | ||
4571 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4572 | err: | |
4573 | kfree_skb(skb2); | |
4574 | return err; | |
e5009240 PNA |
4575 | } |
4576 | ||
4577 | static void nft_obj_destroy(struct nft_object *obj) | |
4578 | { | |
4579 | if (obj->type->destroy) | |
4580 | obj->type->destroy(obj); | |
4581 | ||
4582 | module_put(obj->type->owner); | |
4583 | kfree(obj); | |
4584 | } | |
4585 | ||
4586 | static int nf_tables_delobj(struct net *net, struct sock *nlsk, | |
04ba724b PNA |
4587 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
4588 | const struct nlattr * const nla[], | |
4589 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4590 | { |
4591 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4592 | u8 genmask = nft_genmask_next(net); | |
4593 | int family = nfmsg->nfgen_family; | |
4594 | struct nft_af_info *afi; | |
4595 | struct nft_table *table; | |
4596 | struct nft_object *obj; | |
4597 | struct nft_ctx ctx; | |
4598 | u32 objtype; | |
4599 | ||
4600 | if (!nla[NFTA_OBJ_TYPE] || | |
4601 | !nla[NFTA_OBJ_NAME]) | |
4602 | return -EINVAL; | |
4603 | ||
4604 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4605 | if (IS_ERR(afi)) | |
4606 | return PTR_ERR(afi); | |
4607 | ||
4608 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4609 | if (IS_ERR(table)) | |
4610 | return PTR_ERR(table); | |
4611 | ||
4612 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4613 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4614 | if (IS_ERR(obj)) | |
4615 | return PTR_ERR(obj); | |
4616 | if (obj->use > 0) | |
4617 | return -EBUSY; | |
4618 | ||
4619 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4620 | ||
4621 | return nft_delobj(&ctx, obj); | |
4622 | } | |
4623 | ||
25e94a99 PNA |
4624 | void nft_obj_notify(struct net *net, struct nft_table *table, |
4625 | struct nft_object *obj, u32 portid, u32 seq, int event, | |
4626 | int family, int report, gfp_t gfp) | |
e5009240 PNA |
4627 | { |
4628 | struct sk_buff *skb; | |
4629 | int err; | |
4630 | ||
2599e989 PNA |
4631 | if (!report && |
4632 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 4633 | return; |
e5009240 | 4634 | |
2599e989 | 4635 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp); |
e5009240 PNA |
4636 | if (skb == NULL) |
4637 | goto err; | |
4638 | ||
2599e989 PNA |
4639 | err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family, |
4640 | table, obj, false); | |
e5009240 PNA |
4641 | if (err < 0) { |
4642 | kfree_skb(skb); | |
4643 | goto err; | |
4644 | } | |
4645 | ||
25e94a99 PNA |
4646 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp); |
4647 | return; | |
e5009240 | 4648 | err: |
25e94a99 | 4649 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
e5009240 | 4650 | } |
2599e989 PNA |
4651 | EXPORT_SYMBOL_GPL(nft_obj_notify); |
4652 | ||
25e94a99 PNA |
4653 | static void nf_tables_obj_notify(const struct nft_ctx *ctx, |
4654 | struct nft_object *obj, int event) | |
2599e989 | 4655 | { |
25e94a99 PNA |
4656 | nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, |
4657 | ctx->afi->family, ctx->report, GFP_KERNEL); | |
2599e989 | 4658 | } |
e5009240 | 4659 | |
84d7fce6 PNA |
4660 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
4661 | u32 portid, u32 seq) | |
4662 | { | |
4663 | struct nlmsghdr *nlh; | |
4664 | struct nfgenmsg *nfmsg; | |
dedb67c4 | 4665 | int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); |
84d7fce6 PNA |
4666 | |
4667 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
4668 | if (nlh == NULL) | |
4669 | goto nla_put_failure; | |
4670 | ||
4671 | nfmsg = nlmsg_data(nlh); | |
4672 | nfmsg->nfgen_family = AF_UNSPEC; | |
4673 | nfmsg->version = NFNETLINK_V0; | |
4674 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4675 | ||
4676 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq))) | |
4677 | goto nla_put_failure; | |
4678 | ||
053c095a JB |
4679 | nlmsg_end(skb, nlh); |
4680 | return 0; | |
84d7fce6 PNA |
4681 | |
4682 | nla_put_failure: | |
4683 | nlmsg_trim(skb, nlh); | |
4684 | return -EMSGSIZE; | |
4685 | } | |
4686 | ||
25e94a99 PNA |
4687 | static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, |
4688 | int event) | |
84d7fce6 PNA |
4689 | { |
4690 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
4691 | struct sk_buff *skb2; | |
4692 | int err; | |
4693 | ||
4694 | if (nlmsg_report(nlh) && | |
4695 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 4696 | return; |
84d7fce6 | 4697 | |
84d7fce6 PNA |
4698 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
4699 | if (skb2 == NULL) | |
4700 | goto err; | |
4701 | ||
4702 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
4703 | nlh->nlmsg_seq); | |
4704 | if (err < 0) { | |
4705 | kfree_skb(skb2); | |
4706 | goto err; | |
4707 | } | |
4708 | ||
25e94a99 PNA |
4709 | nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
4710 | nlmsg_report(nlh), GFP_KERNEL); | |
4711 | return; | |
84d7fce6 | 4712 | err: |
25e94a99 PNA |
4713 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
4714 | -ENOBUFS); | |
84d7fce6 PNA |
4715 | } |
4716 | ||
7b8002a1 PNA |
4717 | static int nf_tables_getgen(struct net *net, struct sock *nlsk, |
4718 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4719 | const struct nlattr * const nla[], |
4720 | struct netlink_ext_ack *extack) | |
84d7fce6 | 4721 | { |
84d7fce6 PNA |
4722 | struct sk_buff *skb2; |
4723 | int err; | |
4724 | ||
4725 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4726 | if (skb2 == NULL) | |
4727 | return -ENOMEM; | |
4728 | ||
4729 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
4730 | nlh->nlmsg_seq); | |
4731 | if (err < 0) | |
4732 | goto err; | |
4733 | ||
4734 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4735 | err: | |
4736 | kfree_skb(skb2); | |
4737 | return err; | |
4738 | } | |
4739 | ||
96518518 PM |
4740 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
4741 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 4742 | .call_batch = nf_tables_newtable, |
96518518 PM |
4743 | .attr_count = NFTA_TABLE_MAX, |
4744 | .policy = nft_table_policy, | |
4745 | }, | |
4746 | [NFT_MSG_GETTABLE] = { | |
4747 | .call = nf_tables_gettable, | |
4748 | .attr_count = NFTA_TABLE_MAX, | |
4749 | .policy = nft_table_policy, | |
4750 | }, | |
4751 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 4752 | .call_batch = nf_tables_deltable, |
96518518 PM |
4753 | .attr_count = NFTA_TABLE_MAX, |
4754 | .policy = nft_table_policy, | |
4755 | }, | |
4756 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 4757 | .call_batch = nf_tables_newchain, |
96518518 PM |
4758 | .attr_count = NFTA_CHAIN_MAX, |
4759 | .policy = nft_chain_policy, | |
4760 | }, | |
4761 | [NFT_MSG_GETCHAIN] = { | |
4762 | .call = nf_tables_getchain, | |
4763 | .attr_count = NFTA_CHAIN_MAX, | |
4764 | .policy = nft_chain_policy, | |
4765 | }, | |
4766 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 4767 | .call_batch = nf_tables_delchain, |
96518518 PM |
4768 | .attr_count = NFTA_CHAIN_MAX, |
4769 | .policy = nft_chain_policy, | |
4770 | }, | |
4771 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 4772 | .call_batch = nf_tables_newrule, |
96518518 PM |
4773 | .attr_count = NFTA_RULE_MAX, |
4774 | .policy = nft_rule_policy, | |
4775 | }, | |
4776 | [NFT_MSG_GETRULE] = { | |
4777 | .call = nf_tables_getrule, | |
4778 | .attr_count = NFTA_RULE_MAX, | |
4779 | .policy = nft_rule_policy, | |
4780 | }, | |
4781 | [NFT_MSG_DELRULE] = { | |
0628b123 | 4782 | .call_batch = nf_tables_delrule, |
96518518 PM |
4783 | .attr_count = NFTA_RULE_MAX, |
4784 | .policy = nft_rule_policy, | |
4785 | }, | |
20a69341 | 4786 | [NFT_MSG_NEWSET] = { |
958bee14 | 4787 | .call_batch = nf_tables_newset, |
20a69341 PM |
4788 | .attr_count = NFTA_SET_MAX, |
4789 | .policy = nft_set_policy, | |
4790 | }, | |
4791 | [NFT_MSG_GETSET] = { | |
4792 | .call = nf_tables_getset, | |
4793 | .attr_count = NFTA_SET_MAX, | |
4794 | .policy = nft_set_policy, | |
4795 | }, | |
4796 | [NFT_MSG_DELSET] = { | |
958bee14 | 4797 | .call_batch = nf_tables_delset, |
20a69341 PM |
4798 | .attr_count = NFTA_SET_MAX, |
4799 | .policy = nft_set_policy, | |
4800 | }, | |
4801 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 4802 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
4803 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
4804 | .policy = nft_set_elem_list_policy, | |
4805 | }, | |
4806 | [NFT_MSG_GETSETELEM] = { | |
4807 | .call = nf_tables_getsetelem, | |
4808 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
4809 | .policy = nft_set_elem_list_policy, | |
4810 | }, | |
4811 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 4812 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
4813 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
4814 | .policy = nft_set_elem_list_policy, | |
4815 | }, | |
84d7fce6 PNA |
4816 | [NFT_MSG_GETGEN] = { |
4817 | .call = nf_tables_getgen, | |
4818 | }, | |
e5009240 PNA |
4819 | [NFT_MSG_NEWOBJ] = { |
4820 | .call_batch = nf_tables_newobj, | |
4821 | .attr_count = NFTA_OBJ_MAX, | |
4822 | .policy = nft_obj_policy, | |
4823 | }, | |
4824 | [NFT_MSG_GETOBJ] = { | |
4825 | .call = nf_tables_getobj, | |
4826 | .attr_count = NFTA_OBJ_MAX, | |
4827 | .policy = nft_obj_policy, | |
4828 | }, | |
4829 | [NFT_MSG_DELOBJ] = { | |
4830 | .call_batch = nf_tables_delobj, | |
4831 | .attr_count = NFTA_OBJ_MAX, | |
4832 | .policy = nft_obj_policy, | |
4833 | }, | |
43da04a5 PNA |
4834 | [NFT_MSG_GETOBJ_RESET] = { |
4835 | .call = nf_tables_getobj, | |
4836 | .attr_count = NFTA_OBJ_MAX, | |
4837 | .policy = nft_obj_policy, | |
4838 | }, | |
96518518 PM |
4839 | }; |
4840 | ||
91c7b38d PNA |
4841 | static void nft_chain_commit_update(struct nft_trans *trans) |
4842 | { | |
4843 | struct nft_base_chain *basechain; | |
4844 | ||
4845 | if (nft_trans_chain_name(trans)[0]) | |
4846 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); | |
4847 | ||
f323d954 | 4848 | if (!nft_is_base_chain(trans->ctx.chain)) |
91c7b38d PNA |
4849 | return; |
4850 | ||
4851 | basechain = nft_base_chain(trans->ctx.chain); | |
4852 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
4853 | ||
4854 | switch (nft_trans_chain_policy(trans)) { | |
4855 | case NF_DROP: | |
4856 | case NF_ACCEPT: | |
4857 | basechain->policy = nft_trans_chain_policy(trans); | |
4858 | break; | |
4859 | } | |
4860 | } | |
4861 | ||
b326dd37 | 4862 | static void nf_tables_commit_release(struct nft_trans *trans) |
c7c32e72 | 4863 | { |
c7c32e72 PNA |
4864 | switch (trans->msg_type) { |
4865 | case NFT_MSG_DELTABLE: | |
4866 | nf_tables_table_destroy(&trans->ctx); | |
4867 | break; | |
4868 | case NFT_MSG_DELCHAIN: | |
4869 | nf_tables_chain_destroy(trans->ctx.chain); | |
4870 | break; | |
4871 | case NFT_MSG_DELRULE: | |
4872 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
4873 | break; | |
4874 | case NFT_MSG_DELSET: | |
4875 | nft_set_destroy(nft_trans_set(trans)); | |
4876 | break; | |
61edafbb | 4877 | case NFT_MSG_DELSETELEM: |
59105446 PNA |
4878 | nf_tables_set_elem_destroy(nft_trans_elem_set(trans), |
4879 | nft_trans_elem(trans).priv); | |
61edafbb | 4880 | break; |
e5009240 PNA |
4881 | case NFT_MSG_DELOBJ: |
4882 | nft_obj_destroy(nft_trans_obj(trans)); | |
4883 | break; | |
c7c32e72 PNA |
4884 | } |
4885 | kfree(trans); | |
4886 | } | |
4887 | ||
5913beaf | 4888 | static int nf_tables_commit(struct net *net, struct sk_buff *skb) |
37082f93 | 4889 | { |
37082f93 | 4890 | struct nft_trans *trans, *next; |
a3716e70 | 4891 | struct nft_trans_elem *te; |
37082f93 PNA |
4892 | |
4893 | /* Bump generation counter, invalidate any dump in progress */ | |
38e029f1 | 4894 | while (++net->nft.base_seq == 0); |
37082f93 PNA |
4895 | |
4896 | /* A new generation has just started */ | |
ea4bd995 | 4897 | net->nft.gencursor = nft_gencursor_next(net); |
37082f93 PNA |
4898 | |
4899 | /* Make sure all packets have left the previous generation before | |
4900 | * purging old rules. | |
4901 | */ | |
4902 | synchronize_rcu(); | |
4903 | ||
4904 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 4905 | switch (trans->msg_type) { |
55dd6f93 PNA |
4906 | case NFT_MSG_NEWTABLE: |
4907 | if (nft_trans_table_update(trans)) { | |
4908 | if (!nft_trans_table_enable(trans)) { | |
664b0f8c PNA |
4909 | nf_tables_table_disable(net, |
4910 | trans->ctx.afi, | |
55dd6f93 PNA |
4911 | trans->ctx.table); |
4912 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
4913 | } | |
4914 | } else { | |
f2a6d766 | 4915 | nft_clear(net, trans->ctx.table); |
55dd6f93 | 4916 | } |
35151d84 | 4917 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
4918 | nft_trans_destroy(trans); |
4919 | break; | |
4920 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 4921 | list_del_rcu(&trans->ctx.table->list); |
35151d84 | 4922 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 4923 | break; |
91c7b38d PNA |
4924 | case NFT_MSG_NEWCHAIN: |
4925 | if (nft_trans_chain_update(trans)) | |
4926 | nft_chain_commit_update(trans); | |
4fefee57 | 4927 | else |
664b0f8c | 4928 | nft_clear(net, trans->ctx.chain); |
4fefee57 | 4929 | |
35151d84 | 4930 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
4931 | nft_trans_destroy(trans); |
4932 | break; | |
4933 | case NFT_MSG_DELCHAIN: | |
664b0f8c | 4934 | list_del_rcu(&trans->ctx.chain->list); |
35151d84 | 4935 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
82bec71d PNA |
4936 | nf_tables_unregister_hooks(trans->ctx.net, |
4937 | trans->ctx.table, | |
c5598794 AB |
4938 | trans->ctx.chain, |
4939 | trans->ctx.afi->nops); | |
91c7b38d | 4940 | break; |
b380e5c7 | 4941 | case NFT_MSG_NEWRULE: |
889f7ee7 | 4942 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
35151d84 | 4943 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 4944 | nft_trans_rule(trans), |
35151d84 | 4945 | NFT_MSG_NEWRULE); |
37082f93 | 4946 | nft_trans_destroy(trans); |
b380e5c7 PNA |
4947 | break; |
4948 | case NFT_MSG_DELRULE: | |
4949 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
4950 | nf_tables_rule_notify(&trans->ctx, |
4951 | nft_trans_rule(trans), | |
4952 | NFT_MSG_DELRULE); | |
b380e5c7 | 4953 | break; |
958bee14 | 4954 | case NFT_MSG_NEWSET: |
37a9cc52 | 4955 | nft_clear(net, nft_trans_set(trans)); |
4fefee57 PNA |
4956 | /* This avoids hitting -EBUSY when deleting the table |
4957 | * from the transaction. | |
4958 | */ | |
4959 | if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS && | |
4960 | !list_empty(&nft_trans_set(trans)->bindings)) | |
4961 | trans->ctx.table->use--; | |
4962 | ||
958bee14 | 4963 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 4964 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
4965 | nft_trans_destroy(trans); |
4966 | break; | |
4967 | case NFT_MSG_DELSET: | |
37a9cc52 | 4968 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 | 4969 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 4970 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 4971 | break; |
60319eb1 | 4972 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
4973 | te = (struct nft_trans_elem *)trans->data; |
4974 | ||
42a55769 | 4975 | te->set->ops->activate(net, te->set, &te->elem); |
cc02e457 PM |
4976 | nf_tables_setelem_notify(&trans->ctx, te->set, |
4977 | &te->elem, | |
60319eb1 PNA |
4978 | NFT_MSG_NEWSETELEM, 0); |
4979 | nft_trans_destroy(trans); | |
4980 | break; | |
4981 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 4982 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 4983 | |
a3716e70 PNA |
4984 | nf_tables_setelem_notify(&trans->ctx, te->set, |
4985 | &te->elem, | |
60319eb1 | 4986 | NFT_MSG_DELSETELEM, 0); |
5cb82a38 | 4987 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a PM |
4988 | atomic_dec(&te->set->nelems); |
4989 | te->set->ndeact--; | |
60319eb1 | 4990 | break; |
e5009240 PNA |
4991 | case NFT_MSG_NEWOBJ: |
4992 | nft_clear(net, nft_trans_obj(trans)); | |
4993 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
4994 | NFT_MSG_NEWOBJ); | |
4995 | nft_trans_destroy(trans); | |
4996 | break; | |
4997 | case NFT_MSG_DELOBJ: | |
4998 | list_del_rcu(&nft_trans_obj(trans)->list); | |
4999 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
5000 | NFT_MSG_DELOBJ); | |
5001 | break; | |
37082f93 | 5002 | } |
37082f93 PNA |
5003 | } |
5004 | ||
b326dd37 PNA |
5005 | synchronize_rcu(); |
5006 | ||
37082f93 | 5007 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 | 5008 | list_del(&trans->list); |
b326dd37 | 5009 | nf_tables_commit_release(trans); |
37082f93 | 5010 | } |
84d7fce6 PNA |
5011 | |
5012 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); | |
37082f93 PNA |
5013 | |
5014 | return 0; | |
5015 | } | |
5016 | ||
b326dd37 | 5017 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 5018 | { |
c7c32e72 PNA |
5019 | switch (trans->msg_type) { |
5020 | case NFT_MSG_NEWTABLE: | |
5021 | nf_tables_table_destroy(&trans->ctx); | |
5022 | break; | |
5023 | case NFT_MSG_NEWCHAIN: | |
5024 | nf_tables_chain_destroy(trans->ctx.chain); | |
5025 | break; | |
5026 | case NFT_MSG_NEWRULE: | |
5027 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
5028 | break; | |
5029 | case NFT_MSG_NEWSET: | |
5030 | nft_set_destroy(nft_trans_set(trans)); | |
5031 | break; | |
61edafbb PM |
5032 | case NFT_MSG_NEWSETELEM: |
5033 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 5034 | nft_trans_elem(trans).priv, true); |
61edafbb | 5035 | break; |
e5009240 PNA |
5036 | case NFT_MSG_NEWOBJ: |
5037 | nft_obj_destroy(nft_trans_obj(trans)); | |
5038 | break; | |
c7c32e72 PNA |
5039 | } |
5040 | kfree(trans); | |
5041 | } | |
5042 | ||
5913beaf | 5043 | static int nf_tables_abort(struct net *net, struct sk_buff *skb) |
37082f93 | 5044 | { |
37082f93 | 5045 | struct nft_trans *trans, *next; |
02263db0 | 5046 | struct nft_trans_elem *te; |
37082f93 | 5047 | |
a907e36d XL |
5048 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
5049 | list) { | |
b380e5c7 | 5050 | switch (trans->msg_type) { |
55dd6f93 PNA |
5051 | case NFT_MSG_NEWTABLE: |
5052 | if (nft_trans_table_update(trans)) { | |
5053 | if (nft_trans_table_enable(trans)) { | |
664b0f8c PNA |
5054 | nf_tables_table_disable(net, |
5055 | trans->ctx.afi, | |
55dd6f93 PNA |
5056 | trans->ctx.table); |
5057 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
5058 | } | |
5059 | nft_trans_destroy(trans); | |
5060 | } else { | |
e688a7f8 | 5061 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
5062 | } |
5063 | break; | |
5064 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 5065 | nft_clear(trans->ctx.net, trans->ctx.table); |
55dd6f93 PNA |
5066 | nft_trans_destroy(trans); |
5067 | break; | |
91c7b38d PNA |
5068 | case NFT_MSG_NEWCHAIN: |
5069 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 5070 | free_percpu(nft_trans_chain_stats(trans)); |
91c7b38d PNA |
5071 | |
5072 | nft_trans_destroy(trans); | |
5073 | } else { | |
4fefee57 | 5074 | trans->ctx.table->use--; |
e688a7f8 | 5075 | list_del_rcu(&trans->ctx.chain->list); |
82bec71d PNA |
5076 | nf_tables_unregister_hooks(trans->ctx.net, |
5077 | trans->ctx.table, | |
c5598794 AB |
5078 | trans->ctx.chain, |
5079 | trans->ctx.afi->nops); | |
91c7b38d PNA |
5080 | } |
5081 | break; | |
5082 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 5083 | trans->ctx.table->use++; |
664b0f8c | 5084 | nft_clear(trans->ctx.net, trans->ctx.chain); |
91c7b38d PNA |
5085 | nft_trans_destroy(trans); |
5086 | break; | |
b380e5c7 | 5087 | case NFT_MSG_NEWRULE: |
4fefee57 | 5088 | trans->ctx.chain->use--; |
b380e5c7 PNA |
5089 | list_del_rcu(&nft_trans_rule(trans)->list); |
5090 | break; | |
5091 | case NFT_MSG_DELRULE: | |
4fefee57 | 5092 | trans->ctx.chain->use++; |
889f7ee7 | 5093 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
37082f93 | 5094 | nft_trans_destroy(trans); |
b380e5c7 | 5095 | break; |
958bee14 | 5096 | case NFT_MSG_NEWSET: |
4fefee57 | 5097 | trans->ctx.table->use--; |
e688a7f8 | 5098 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
5099 | break; |
5100 | case NFT_MSG_DELSET: | |
4fefee57 | 5101 | trans->ctx.table->use++; |
37a9cc52 | 5102 | nft_clear(trans->ctx.net, nft_trans_set(trans)); |
958bee14 PNA |
5103 | nft_trans_destroy(trans); |
5104 | break; | |
60319eb1 | 5105 | case NFT_MSG_NEWSETELEM: |
02263db0 | 5106 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 5107 | |
5cb82a38 | 5108 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a | 5109 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
5110 | break; |
5111 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
5112 | te = (struct nft_trans_elem *)trans->data; |
5113 | ||
59105446 | 5114 | nft_set_elem_activate(net, te->set, &te->elem); |
42a55769 | 5115 | te->set->ops->activate(net, te->set, &te->elem); |
3dd0673a | 5116 | te->set->ndeact--; |
cc02e457 | 5117 | |
e5009240 PNA |
5118 | nft_trans_destroy(trans); |
5119 | break; | |
5120 | case NFT_MSG_NEWOBJ: | |
5121 | trans->ctx.table->use--; | |
5122 | list_del_rcu(&nft_trans_obj(trans)->list); | |
5123 | break; | |
5124 | case NFT_MSG_DELOBJ: | |
5125 | trans->ctx.table->use++; | |
5126 | nft_clear(trans->ctx.net, nft_trans_obj(trans)); | |
60319eb1 PNA |
5127 | nft_trans_destroy(trans); |
5128 | break; | |
37082f93 | 5129 | } |
37082f93 PNA |
5130 | } |
5131 | ||
b326dd37 PNA |
5132 | synchronize_rcu(); |
5133 | ||
a1cee076 PNA |
5134 | list_for_each_entry_safe_reverse(trans, next, |
5135 | &net->nft.commit_list, list) { | |
c7c32e72 | 5136 | list_del(&trans->list); |
b326dd37 | 5137 | nf_tables_abort_release(trans); |
37082f93 PNA |
5138 | } |
5139 | ||
5140 | return 0; | |
5141 | } | |
5142 | ||
74e8bcd2 PNA |
5143 | static bool nf_tables_valid_genid(struct net *net, u32 genid) |
5144 | { | |
5145 | return net->nft.base_seq == genid; | |
5146 | } | |
5147 | ||
96518518 PM |
5148 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
5149 | .name = "nf_tables", | |
5150 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
5151 | .cb_count = NFT_MSG_MAX, | |
5152 | .cb = nf_tables_cb, | |
0628b123 PNA |
5153 | .commit = nf_tables_commit, |
5154 | .abort = nf_tables_abort, | |
74e8bcd2 | 5155 | .valid_genid = nf_tables_valid_genid, |
96518518 PM |
5156 | }; |
5157 | ||
7210e4e3 PNA |
5158 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
5159 | enum nft_chain_type type) | |
5160 | { | |
5161 | const struct nft_base_chain *basechain; | |
5162 | ||
f323d954 | 5163 | if (nft_is_base_chain(chain)) { |
7210e4e3 PNA |
5164 | basechain = nft_base_chain(chain); |
5165 | if (basechain->type->type != type) | |
5166 | return -EOPNOTSUPP; | |
5167 | } | |
5168 | return 0; | |
5169 | } | |
5170 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
5171 | ||
75e8d06d PNA |
5172 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
5173 | unsigned int hook_flags) | |
5174 | { | |
5175 | struct nft_base_chain *basechain; | |
5176 | ||
f323d954 | 5177 | if (nft_is_base_chain(chain)) { |
75e8d06d PNA |
5178 | basechain = nft_base_chain(chain); |
5179 | ||
5180 | if ((1 << basechain->ops[0].hooknum) & hook_flags) | |
5181 | return 0; | |
5182 | ||
5183 | return -EOPNOTSUPP; | |
5184 | } | |
5185 | ||
5186 | return 0; | |
5187 | } | |
5188 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
5189 | ||
20a69341 PM |
5190 | /* |
5191 | * Loop detection - walk through the ruleset beginning at the destination chain | |
5192 | * of a new jump until either the source chain is reached (loop) or all | |
5193 | * reachable chains have been traversed. | |
5194 | * | |
5195 | * The loop check is performed whenever a new jump verdict is added to an | |
5196 | * expression or verdict map or a verdict map is bound to a new chain. | |
5197 | */ | |
5198 | ||
5199 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
5200 | const struct nft_chain *chain); | |
5201 | ||
5202 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 5203 | struct nft_set *set, |
20a69341 | 5204 | const struct nft_set_iter *iter, |
de70185d | 5205 | struct nft_set_elem *elem) |
20a69341 | 5206 | { |
fe2811eb PM |
5207 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
5208 | const struct nft_data *data; | |
5209 | ||
5210 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
5211 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
5212 | return 0; |
5213 | ||
fe2811eb | 5214 | data = nft_set_ext_data(ext); |
1ca2e170 | 5215 | switch (data->verdict.code) { |
20a69341 PM |
5216 | case NFT_JUMP: |
5217 | case NFT_GOTO: | |
1ca2e170 | 5218 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
5219 | default: |
5220 | return 0; | |
5221 | } | |
5222 | } | |
5223 | ||
5224 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
5225 | const struct nft_chain *chain) | |
5226 | { | |
5227 | const struct nft_rule *rule; | |
5228 | const struct nft_expr *expr, *last; | |
de70185d | 5229 | struct nft_set *set; |
20a69341 PM |
5230 | struct nft_set_binding *binding; |
5231 | struct nft_set_iter iter; | |
20a69341 PM |
5232 | |
5233 | if (ctx->chain == chain) | |
5234 | return -ELOOP; | |
5235 | ||
5236 | list_for_each_entry(rule, &chain->rules, list) { | |
5237 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
5238 | const struct nft_data *data = NULL; |
5239 | int err; | |
5240 | ||
5241 | if (!expr->ops->validate) | |
20a69341 PM |
5242 | continue; |
5243 | ||
0ca743a5 PNA |
5244 | err = expr->ops->validate(ctx, expr, &data); |
5245 | if (err < 0) | |
5246 | return err; | |
5247 | ||
20a69341 | 5248 | if (data == NULL) |
0ca743a5 | 5249 | continue; |
20a69341 | 5250 | |
1ca2e170 | 5251 | switch (data->verdict.code) { |
20a69341 PM |
5252 | case NFT_JUMP: |
5253 | case NFT_GOTO: | |
1ca2e170 PM |
5254 | err = nf_tables_check_loops(ctx, |
5255 | data->verdict.chain); | |
20a69341 PM |
5256 | if (err < 0) |
5257 | return err; | |
5258 | default: | |
5259 | break; | |
5260 | } | |
5261 | } | |
5262 | } | |
5263 | ||
5264 | list_for_each_entry(set, &ctx->table->sets, list) { | |
37a9cc52 PNA |
5265 | if (!nft_is_active_next(ctx->net, set)) |
5266 | continue; | |
20a69341 PM |
5267 | if (!(set->flags & NFT_SET_MAP) || |
5268 | set->dtype != NFT_DATA_VERDICT) | |
5269 | continue; | |
5270 | ||
5271 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
5272 | if (!(binding->flags & NFT_SET_MAP) || |
5273 | binding->chain != chain) | |
20a69341 PM |
5274 | continue; |
5275 | ||
8588ac09 | 5276 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
5277 | iter.skip = 0; |
5278 | iter.count = 0; | |
5279 | iter.err = 0; | |
5280 | iter.fn = nf_tables_loop_check_setelem; | |
5281 | ||
5282 | set->ops->walk(ctx, set, &iter); | |
5283 | if (iter.err < 0) | |
5284 | return iter.err; | |
5285 | } | |
5286 | } | |
5287 | ||
5288 | return 0; | |
5289 | } | |
5290 | ||
36b701fa LGL |
5291 | /** |
5292 | * nft_parse_u32_check - fetch u32 attribute and check for maximum value | |
5293 | * | |
5294 | * @attr: netlink attribute to fetch value from | |
5295 | * @max: maximum value to be stored in dest | |
5296 | * @dest: pointer to the variable | |
5297 | * | |
5298 | * Parse, check and store a given u32 netlink attribute into variable. | |
5299 | * This function returns -ERANGE if the value goes over maximum value. | |
5300 | * Otherwise a 0 is returned and the attribute value is stored in the | |
5301 | * destination variable. | |
5302 | */ | |
f1d505bb | 5303 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) |
36b701fa | 5304 | { |
09525a09 | 5305 | u32 val; |
36b701fa LGL |
5306 | |
5307 | val = ntohl(nla_get_be32(attr)); | |
5308 | if (val > max) | |
5309 | return -ERANGE; | |
5310 | ||
5311 | *dest = val; | |
5312 | return 0; | |
5313 | } | |
5314 | EXPORT_SYMBOL_GPL(nft_parse_u32_check); | |
5315 | ||
49499c3e PM |
5316 | /** |
5317 | * nft_parse_register - parse a register value from a netlink attribute | |
5318 | * | |
5319 | * @attr: netlink attribute | |
5320 | * | |
5321 | * Parse and translate a register value from a netlink attribute. | |
5322 | * Registers used to be 128 bit wide, these register numbers will be | |
5323 | * mapped to the corresponding 32 bit register numbers. | |
5324 | */ | |
b1c96ed3 PM |
5325 | unsigned int nft_parse_register(const struct nlattr *attr) |
5326 | { | |
49499c3e PM |
5327 | unsigned int reg; |
5328 | ||
5329 | reg = ntohl(nla_get_be32(attr)); | |
5330 | switch (reg) { | |
5331 | case NFT_REG_VERDICT...NFT_REG_4: | |
5332 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
5333 | default: | |
5334 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
5335 | } | |
b1c96ed3 PM |
5336 | } |
5337 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
5338 | ||
49499c3e PM |
5339 | /** |
5340 | * nft_dump_register - dump a register value to a netlink attribute | |
5341 | * | |
5342 | * @skb: socket buffer | |
5343 | * @attr: attribute number | |
5344 | * @reg: register number | |
5345 | * | |
5346 | * Construct a netlink attribute containing the register number. For | |
5347 | * compatibility reasons, register numbers being a multiple of 4 are | |
5348 | * translated to the corresponding 128 bit register numbers. | |
5349 | */ | |
b1c96ed3 PM |
5350 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
5351 | { | |
49499c3e PM |
5352 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
5353 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
5354 | else | |
5355 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
5356 | ||
b1c96ed3 PM |
5357 | return nla_put_be32(skb, attr, htonl(reg)); |
5358 | } | |
5359 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
5360 | ||
96518518 | 5361 | /** |
d07db988 | 5362 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
5363 | * |
5364 | * @reg: the register number | |
d07db988 | 5365 | * @len: the length of the data |
96518518 PM |
5366 | * |
5367 | * Validate that the input register is one of the general purpose | |
d07db988 | 5368 | * registers and that the length of the load is within the bounds. |
96518518 | 5369 | */ |
d07db988 | 5370 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 5371 | { |
49499c3e | 5372 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 5373 | return -EINVAL; |
d07db988 PM |
5374 | if (len == 0) |
5375 | return -EINVAL; | |
49499c3e | 5376 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 5377 | return -ERANGE; |
49499c3e | 5378 | |
96518518 PM |
5379 | return 0; |
5380 | } | |
d07db988 | 5381 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 5382 | |
96518518 | 5383 | /** |
1ec10212 | 5384 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
5385 | * |
5386 | * @ctx: context of the expression performing the load | |
5387 | * @reg: the destination register number | |
5388 | * @data: the data to load | |
5389 | * @type: the data type | |
45d9bcda | 5390 | * @len: the length of the data |
96518518 PM |
5391 | * |
5392 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
5393 | * the destination register and the length is within the bounds. |
5394 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 5395 | * data. |
96518518 | 5396 | */ |
1ec10212 PM |
5397 | int nft_validate_register_store(const struct nft_ctx *ctx, |
5398 | enum nft_registers reg, | |
5399 | const struct nft_data *data, | |
5400 | enum nft_data_types type, unsigned int len) | |
96518518 | 5401 | { |
20a69341 PM |
5402 | int err; |
5403 | ||
96518518 PM |
5404 | switch (reg) { |
5405 | case NFT_REG_VERDICT: | |
58f40ab6 | 5406 | if (type != NFT_DATA_VERDICT) |
96518518 | 5407 | return -EINVAL; |
20a69341 | 5408 | |
58f40ab6 | 5409 | if (data != NULL && |
1ca2e170 PM |
5410 | (data->verdict.code == NFT_GOTO || |
5411 | data->verdict.code == NFT_JUMP)) { | |
5412 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
5413 | if (err < 0) |
5414 | return err; | |
5415 | ||
1ca2e170 PM |
5416 | if (ctx->chain->level + 1 > |
5417 | data->verdict.chain->level) { | |
20a69341 PM |
5418 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
5419 | return -EMLINK; | |
1ca2e170 | 5420 | data->verdict.chain->level = ctx->chain->level + 1; |
20a69341 PM |
5421 | } |
5422 | } | |
5423 | ||
96518518 PM |
5424 | return 0; |
5425 | default: | |
49499c3e | 5426 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 5427 | return -EINVAL; |
45d9bcda PM |
5428 | if (len == 0) |
5429 | return -EINVAL; | |
49499c3e PM |
5430 | if (reg * NFT_REG32_SIZE + len > |
5431 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 5432 | return -ERANGE; |
27e6d201 | 5433 | |
96518518 PM |
5434 | if (data != NULL && type != NFT_DATA_VALUE) |
5435 | return -EINVAL; | |
5436 | return 0; | |
5437 | } | |
5438 | } | |
1ec10212 | 5439 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
5440 | |
5441 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
5442 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
5443 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
5444 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
5445 | }; | |
5446 | ||
5447 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
5448 | struct nft_data_desc *desc, const struct nlattr *nla) | |
5449 | { | |
664b0f8c | 5450 | u8 genmask = nft_genmask_next(ctx->net); |
96518518 PM |
5451 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
5452 | struct nft_chain *chain; | |
5453 | int err; | |
5454 | ||
fceb6435 JB |
5455 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy, |
5456 | NULL); | |
96518518 PM |
5457 | if (err < 0) |
5458 | return err; | |
5459 | ||
5460 | if (!tb[NFTA_VERDICT_CODE]) | |
5461 | return -EINVAL; | |
1ca2e170 | 5462 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 5463 | |
1ca2e170 | 5464 | switch (data->verdict.code) { |
e0abdadc | 5465 | default: |
1ca2e170 | 5466 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
5467 | case NF_ACCEPT: |
5468 | case NF_DROP: | |
5469 | case NF_QUEUE: | |
5470 | break; | |
5471 | default: | |
5472 | return -EINVAL; | |
5473 | } | |
5474 | /* fall through */ | |
96518518 PM |
5475 | case NFT_CONTINUE: |
5476 | case NFT_BREAK: | |
5477 | case NFT_RETURN: | |
96518518 PM |
5478 | break; |
5479 | case NFT_JUMP: | |
5480 | case NFT_GOTO: | |
5481 | if (!tb[NFTA_VERDICT_CHAIN]) | |
5482 | return -EINVAL; | |
5483 | chain = nf_tables_chain_lookup(ctx->table, | |
664b0f8c | 5484 | tb[NFTA_VERDICT_CHAIN], genmask); |
96518518 PM |
5485 | if (IS_ERR(chain)) |
5486 | return PTR_ERR(chain); | |
f323d954 | 5487 | if (nft_is_base_chain(chain)) |
96518518 PM |
5488 | return -EOPNOTSUPP; |
5489 | ||
96518518 | 5490 | chain->use++; |
1ca2e170 | 5491 | data->verdict.chain = chain; |
96518518 | 5492 | break; |
96518518 PM |
5493 | } |
5494 | ||
4c4ed074 | 5495 | desc->len = sizeof(data->verdict); |
96518518 PM |
5496 | desc->type = NFT_DATA_VERDICT; |
5497 | return 0; | |
5498 | } | |
5499 | ||
5500 | static void nft_verdict_uninit(const struct nft_data *data) | |
5501 | { | |
1ca2e170 | 5502 | switch (data->verdict.code) { |
96518518 PM |
5503 | case NFT_JUMP: |
5504 | case NFT_GOTO: | |
1ca2e170 | 5505 | data->verdict.chain->use--; |
96518518 PM |
5506 | break; |
5507 | } | |
5508 | } | |
5509 | ||
33d5a7b1 | 5510 | int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) |
96518518 PM |
5511 | { |
5512 | struct nlattr *nest; | |
5513 | ||
33d5a7b1 | 5514 | nest = nla_nest_start(skb, type); |
96518518 PM |
5515 | if (!nest) |
5516 | goto nla_put_failure; | |
5517 | ||
33d5a7b1 | 5518 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) |
96518518 PM |
5519 | goto nla_put_failure; |
5520 | ||
33d5a7b1 | 5521 | switch (v->code) { |
96518518 PM |
5522 | case NFT_JUMP: |
5523 | case NFT_GOTO: | |
1ca2e170 | 5524 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
33d5a7b1 | 5525 | v->chain->name)) |
96518518 PM |
5526 | goto nla_put_failure; |
5527 | } | |
5528 | nla_nest_end(skb, nest); | |
5529 | return 0; | |
5530 | ||
5531 | nla_put_failure: | |
5532 | return -1; | |
5533 | } | |
5534 | ||
d0a11fc3 PM |
5535 | static int nft_value_init(const struct nft_ctx *ctx, |
5536 | struct nft_data *data, unsigned int size, | |
96518518 PM |
5537 | struct nft_data_desc *desc, const struct nlattr *nla) |
5538 | { | |
5539 | unsigned int len; | |
5540 | ||
5541 | len = nla_len(nla); | |
5542 | if (len == 0) | |
5543 | return -EINVAL; | |
d0a11fc3 | 5544 | if (len > size) |
96518518 PM |
5545 | return -EOVERFLOW; |
5546 | ||
d0a11fc3 | 5547 | nla_memcpy(data->data, nla, len); |
96518518 PM |
5548 | desc->type = NFT_DATA_VALUE; |
5549 | desc->len = len; | |
5550 | return 0; | |
5551 | } | |
5552 | ||
5553 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
5554 | unsigned int len) | |
5555 | { | |
5556 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
5557 | } | |
5558 | ||
5559 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 5560 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
5561 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
5562 | }; | |
5563 | ||
5564 | /** | |
5565 | * nft_data_init - parse nf_tables data netlink attributes | |
5566 | * | |
5567 | * @ctx: context of the expression using the data | |
5568 | * @data: destination struct nft_data | |
d0a11fc3 | 5569 | * @size: maximum data length |
96518518 PM |
5570 | * @desc: data description |
5571 | * @nla: netlink attribute containing data | |
5572 | * | |
5573 | * Parse the netlink data attributes and initialize a struct nft_data. | |
5574 | * The type and length of data are returned in the data description. | |
5575 | * | |
5576 | * The caller can indicate that it only wants to accept data of type | |
5577 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
5578 | */ | |
d0a11fc3 PM |
5579 | int nft_data_init(const struct nft_ctx *ctx, |
5580 | struct nft_data *data, unsigned int size, | |
96518518 PM |
5581 | struct nft_data_desc *desc, const struct nlattr *nla) |
5582 | { | |
5583 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
5584 | int err; | |
5585 | ||
fceb6435 | 5586 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL); |
96518518 PM |
5587 | if (err < 0) |
5588 | return err; | |
5589 | ||
5590 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
5591 | return nft_value_init(ctx, data, size, desc, |
5592 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
5593 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
5594 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
5595 | return -EINVAL; | |
5596 | } | |
5597 | EXPORT_SYMBOL_GPL(nft_data_init); | |
5598 | ||
5599 | /** | |
59105446 | 5600 | * nft_data_release - release a nft_data item |
96518518 PM |
5601 | * |
5602 | * @data: struct nft_data to release | |
5603 | * @type: type of data | |
5604 | * | |
5605 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
5606 | * all others need to be released by calling this function. | |
5607 | */ | |
59105446 | 5608 | void nft_data_release(const struct nft_data *data, enum nft_data_types type) |
96518518 | 5609 | { |
960bd2c2 | 5610 | if (type < NFT_DATA_VERDICT) |
96518518 | 5611 | return; |
960bd2c2 | 5612 | switch (type) { |
96518518 PM |
5613 | case NFT_DATA_VERDICT: |
5614 | return nft_verdict_uninit(data); | |
5615 | default: | |
5616 | WARN_ON(1); | |
5617 | } | |
5618 | } | |
59105446 | 5619 | EXPORT_SYMBOL_GPL(nft_data_release); |
96518518 PM |
5620 | |
5621 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
5622 | enum nft_data_types type, unsigned int len) | |
5623 | { | |
5624 | struct nlattr *nest; | |
5625 | int err; | |
5626 | ||
5627 | nest = nla_nest_start(skb, attr); | |
5628 | if (nest == NULL) | |
5629 | return -1; | |
5630 | ||
5631 | switch (type) { | |
5632 | case NFT_DATA_VALUE: | |
5633 | err = nft_value_dump(skb, data, len); | |
5634 | break; | |
5635 | case NFT_DATA_VERDICT: | |
33d5a7b1 | 5636 | err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); |
96518518 PM |
5637 | break; |
5638 | default: | |
5639 | err = -EINVAL; | |
5640 | WARN_ON(1); | |
5641 | } | |
5642 | ||
5643 | nla_nest_end(skb, nest); | |
5644 | return err; | |
5645 | } | |
5646 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
5647 | ||
df05ef87 | 5648 | static int __net_init nf_tables_init_net(struct net *net) |
99633ab2 PNA |
5649 | { |
5650 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 5651 | INIT_LIST_HEAD(&net->nft.commit_list); |
38e029f1 | 5652 | net->nft.base_seq = 1; |
99633ab2 PNA |
5653 | return 0; |
5654 | } | |
5655 | ||
5ebe0b0e PNA |
5656 | int __nft_release_basechain(struct nft_ctx *ctx) |
5657 | { | |
5658 | struct nft_rule *rule, *nr; | |
5659 | ||
f323d954 | 5660 | BUG_ON(!nft_is_base_chain(ctx->chain)); |
5ebe0b0e | 5661 | |
82bec71d | 5662 | nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain, |
5ebe0b0e PNA |
5663 | ctx->afi->nops); |
5664 | list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { | |
5665 | list_del(&rule->list); | |
5666 | ctx->chain->use--; | |
5667 | nf_tables_rule_destroy(ctx, rule); | |
5668 | } | |
5669 | list_del(&ctx->chain->list); | |
5670 | ctx->table->use--; | |
5671 | nf_tables_chain_destroy(ctx->chain); | |
5672 | ||
5673 | return 0; | |
5674 | } | |
5675 | EXPORT_SYMBOL_GPL(__nft_release_basechain); | |
5676 | ||
df05ef87 PNA |
5677 | /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */ |
5678 | static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi) | |
5679 | { | |
5680 | struct nft_table *table, *nt; | |
5681 | struct nft_chain *chain, *nc; | |
e5009240 | 5682 | struct nft_object *obj, *ne; |
df05ef87 PNA |
5683 | struct nft_rule *rule, *nr; |
5684 | struct nft_set *set, *ns; | |
5685 | struct nft_ctx ctx = { | |
5686 | .net = net, | |
5687 | .afi = afi, | |
5688 | }; | |
5689 | ||
5690 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
5691 | list_for_each_entry(chain, &table->chains, list) | |
82bec71d PNA |
5692 | nf_tables_unregister_hooks(net, table, chain, |
5693 | afi->nops); | |
df05ef87 PNA |
5694 | /* No packets are walking on these chains anymore. */ |
5695 | ctx.table = table; | |
5696 | list_for_each_entry(chain, &table->chains, list) { | |
5697 | ctx.chain = chain; | |
5698 | list_for_each_entry_safe(rule, nr, &chain->rules, list) { | |
5699 | list_del(&rule->list); | |
5700 | chain->use--; | |
5701 | nf_tables_rule_destroy(&ctx, rule); | |
5702 | } | |
5703 | } | |
5704 | list_for_each_entry_safe(set, ns, &table->sets, list) { | |
5705 | list_del(&set->list); | |
5706 | table->use--; | |
5707 | nft_set_destroy(set); | |
5708 | } | |
e5009240 PNA |
5709 | list_for_each_entry_safe(obj, ne, &table->objects, list) { |
5710 | list_del(&obj->list); | |
5711 | table->use--; | |
5712 | nft_obj_destroy(obj); | |
5713 | } | |
df05ef87 PNA |
5714 | list_for_each_entry_safe(chain, nc, &table->chains, list) { |
5715 | list_del(&chain->list); | |
5716 | table->use--; | |
5717 | nf_tables_chain_destroy(chain); | |
5718 | } | |
5719 | list_del(&table->list); | |
5720 | nf_tables_table_destroy(&ctx); | |
5721 | } | |
5722 | } | |
5723 | ||
99633ab2 PNA |
5724 | static struct pernet_operations nf_tables_net_ops = { |
5725 | .init = nf_tables_init_net, | |
5726 | }; | |
5727 | ||
96518518 PM |
5728 | static int __init nf_tables_module_init(void) |
5729 | { | |
5730 | int err; | |
5731 | ||
5732 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
5733 | GFP_KERNEL); | |
5734 | if (info == NULL) { | |
5735 | err = -ENOMEM; | |
5736 | goto err1; | |
5737 | } | |
5738 | ||
5739 | err = nf_tables_core_module_init(); | |
5740 | if (err < 0) | |
5741 | goto err2; | |
5742 | ||
5743 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
5744 | if (err < 0) | |
5745 | goto err3; | |
5746 | ||
5747 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 5748 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
5749 | err3: |
5750 | nf_tables_core_module_exit(); | |
5751 | err2: | |
5752 | kfree(info); | |
5753 | err1: | |
5754 | return err; | |
5755 | } | |
5756 | ||
5757 | static void __exit nf_tables_module_exit(void) | |
5758 | { | |
99633ab2 | 5759 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 | 5760 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
1b1bc49c | 5761 | rcu_barrier(); |
96518518 PM |
5762 | nf_tables_core_module_exit(); |
5763 | kfree(info); | |
5764 | } | |
5765 | ||
5766 | module_init(nf_tables_module_init); | |
5767 | module_exit(nf_tables_module_exit); | |
5768 | ||
5769 | MODULE_LICENSE("GPL"); | |
5770 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
5771 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |