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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 | ||
aa06e0ca PNA |
223 | static void nft_rule_expr_activate(const struct nft_ctx *ctx, |
224 | struct nft_rule *rule) | |
225 | { | |
226 | struct nft_expr *expr; | |
227 | ||
228 | expr = nft_expr_first(rule); | |
229 | while (expr != nft_expr_last(rule) && expr->ops) { | |
230 | if (expr->ops->activate) | |
231 | expr->ops->activate(ctx, expr); | |
232 | ||
233 | expr = nft_expr_next(expr); | |
234 | } | |
235 | } | |
236 | ||
237 | static void nft_rule_expr_deactivate(const struct nft_ctx *ctx, | |
238 | struct nft_rule *rule) | |
239 | { | |
240 | struct nft_expr *expr; | |
241 | ||
242 | expr = nft_expr_first(rule); | |
243 | while (expr != nft_expr_last(rule) && expr->ops) { | |
244 | if (expr->ops->deactivate) | |
245 | expr->ops->deactivate(ctx, expr); | |
246 | ||
247 | expr = nft_expr_next(expr); | |
248 | } | |
249 | } | |
250 | ||
ee01d542 AB |
251 | static int |
252 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) | |
253 | { | |
254 | /* You cannot delete the same rule twice */ | |
889f7ee7 PNA |
255 | if (nft_is_active_next(ctx->net, rule)) { |
256 | nft_deactivate_next(ctx->net, rule); | |
ee01d542 AB |
257 | ctx->chain->use--; |
258 | return 0; | |
259 | } | |
260 | return -ENOENT; | |
261 | } | |
262 | ||
263 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, | |
264 | struct nft_rule *rule) | |
265 | { | |
266 | struct nft_trans *trans; | |
267 | ||
268 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); | |
269 | if (trans == NULL) | |
270 | return NULL; | |
271 | ||
1a94e38d PNA |
272 | if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) { |
273 | nft_trans_rule_id(trans) = | |
274 | ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID])); | |
275 | } | |
ee01d542 AB |
276 | nft_trans_rule(trans) = rule; |
277 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
278 | ||
279 | return trans; | |
280 | } | |
281 | ||
282 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) | |
283 | { | |
284 | struct nft_trans *trans; | |
285 | int err; | |
286 | ||
287 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); | |
288 | if (trans == NULL) | |
289 | return -ENOMEM; | |
290 | ||
291 | err = nf_tables_delrule_deactivate(ctx, rule); | |
292 | if (err < 0) { | |
293 | nft_trans_destroy(trans); | |
294 | return err; | |
295 | } | |
aa06e0ca | 296 | nft_rule_expr_deactivate(ctx, rule); |
ee01d542 AB |
297 | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static int nft_delrule_by_chain(struct nft_ctx *ctx) | |
302 | { | |
303 | struct nft_rule *rule; | |
304 | int err; | |
305 | ||
306 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
307 | err = nft_delrule(ctx, rule); | |
308 | if (err < 0) | |
309 | return err; | |
310 | } | |
311 | return 0; | |
312 | } | |
313 | ||
ee01d542 AB |
314 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, |
315 | struct nft_set *set) | |
316 | { | |
317 | struct nft_trans *trans; | |
318 | ||
319 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); | |
320 | if (trans == NULL) | |
321 | return -ENOMEM; | |
322 | ||
323 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { | |
324 | nft_trans_set_id(trans) = | |
325 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); | |
37a9cc52 | 326 | nft_activate_next(ctx->net, set); |
ee01d542 AB |
327 | } |
328 | nft_trans_set(trans) = set; | |
329 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | static int nft_delset(struct nft_ctx *ctx, struct nft_set *set) | |
335 | { | |
336 | int err; | |
337 | ||
338 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); | |
339 | if (err < 0) | |
340 | return err; | |
341 | ||
37a9cc52 | 342 | nft_deactivate_next(ctx->net, set); |
ee01d542 AB |
343 | ctx->table->use--; |
344 | ||
345 | return err; | |
346 | } | |
347 | ||
e5009240 PNA |
348 | static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type, |
349 | struct nft_object *obj) | |
350 | { | |
351 | struct nft_trans *trans; | |
352 | ||
353 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj)); | |
354 | if (trans == NULL) | |
355 | return -ENOMEM; | |
356 | ||
357 | if (msg_type == NFT_MSG_NEWOBJ) | |
358 | nft_activate_next(ctx->net, obj); | |
359 | ||
360 | nft_trans_obj(trans) = obj; | |
361 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj) | |
367 | { | |
368 | int err; | |
369 | ||
370 | err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj); | |
371 | if (err < 0) | |
372 | return err; | |
373 | ||
374 | nft_deactivate_next(ctx->net, obj); | |
375 | ctx->table->use--; | |
376 | ||
377 | return err; | |
378 | } | |
379 | ||
96518518 PM |
380 | /* |
381 | * Tables | |
382 | */ | |
383 | ||
384 | static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, | |
f2a6d766 PNA |
385 | const struct nlattr *nla, |
386 | u8 genmask) | |
96518518 PM |
387 | { |
388 | struct nft_table *table; | |
389 | ||
390 | list_for_each_entry(table, &afi->tables, list) { | |
f2a6d766 PNA |
391 | if (!nla_strcmp(nla, table->name) && |
392 | nft_active_genmask(table, genmask)) | |
96518518 PM |
393 | return table; |
394 | } | |
395 | return NULL; | |
396 | } | |
397 | ||
398 | static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, | |
f2a6d766 PNA |
399 | const struct nlattr *nla, |
400 | u8 genmask) | |
96518518 PM |
401 | { |
402 | struct nft_table *table; | |
403 | ||
404 | if (nla == NULL) | |
405 | return ERR_PTR(-EINVAL); | |
406 | ||
f2a6d766 | 407 | table = nft_table_lookup(afi, nla, genmask); |
96518518 PM |
408 | if (table != NULL) |
409 | return table; | |
410 | ||
96518518 PM |
411 | return ERR_PTR(-ENOENT); |
412 | } | |
413 | ||
414 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) | |
415 | { | |
416 | return ++table->hgenerator; | |
417 | } | |
418 | ||
d8297d4f | 419 | static const struct nf_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX]; |
9370761c | 420 | |
2a37d755 | 421 | static const struct nf_chain_type * |
baae3e62 | 422 | __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
9370761c PNA |
423 | { |
424 | int i; | |
425 | ||
baae3e62 | 426 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
427 | if (chain_type[family][i] != NULL && |
428 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 429 | return chain_type[family][i]; |
9370761c | 430 | } |
baae3e62 | 431 | return NULL; |
9370761c PNA |
432 | } |
433 | ||
2a37d755 | 434 | static const struct nf_chain_type * |
baae3e62 PM |
435 | nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
436 | const struct nlattr *nla, | |
437 | bool autoload) | |
9370761c | 438 | { |
2a37d755 | 439 | const struct nf_chain_type *type; |
9370761c PNA |
440 | |
441 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
442 | if (type != NULL) |
443 | return type; | |
9370761c | 444 | #ifdef CONFIG_MODULES |
93b0806f | 445 | if (autoload) { |
9370761c | 446 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2fec6bb6 PNA |
447 | request_module("nft-chain-%u-%.*s", afi->family, |
448 | nla_len(nla), (const char *)nla_data(nla)); | |
9370761c PNA |
449 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
450 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
451 | if (type != NULL) |
452 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
453 | } |
454 | #endif | |
93b0806f | 455 | return ERR_PTR(-ENOENT); |
9370761c PNA |
456 | } |
457 | ||
96518518 | 458 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
1cae565e PNA |
459 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
460 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
9ddf6323 | 461 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
462 | }; |
463 | ||
84d7fce6 PNA |
464 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
465 | u32 portid, u32 seq, int event, u32 flags, | |
466 | int family, const struct nft_table *table) | |
96518518 PM |
467 | { |
468 | struct nlmsghdr *nlh; | |
469 | struct nfgenmsg *nfmsg; | |
470 | ||
dedb67c4 | 471 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
472 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
473 | if (nlh == NULL) | |
474 | goto nla_put_failure; | |
475 | ||
476 | nfmsg = nlmsg_data(nlh); | |
477 | nfmsg->nfgen_family = family; | |
478 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 479 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 | 480 | |
9ddf6323 | 481 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 TB |
482 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
483 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) | |
96518518 PM |
484 | goto nla_put_failure; |
485 | ||
053c095a JB |
486 | nlmsg_end(skb, nlh); |
487 | return 0; | |
96518518 PM |
488 | |
489 | nla_put_failure: | |
490 | nlmsg_trim(skb, nlh); | |
491 | return -1; | |
492 | } | |
493 | ||
25e94a99 | 494 | static void nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
495 | { |
496 | struct sk_buff *skb; | |
96518518 PM |
497 | int err; |
498 | ||
128ad332 PNA |
499 | if (!ctx->report && |
500 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 501 | return; |
96518518 | 502 | |
96518518 PM |
503 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
504 | if (skb == NULL) | |
505 | goto err; | |
506 | ||
84d7fce6 PNA |
507 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
508 | event, 0, ctx->afi->family, ctx->table); | |
96518518 PM |
509 | if (err < 0) { |
510 | kfree_skb(skb); | |
511 | goto err; | |
512 | } | |
513 | ||
25e94a99 PNA |
514 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
515 | ctx->report, GFP_KERNEL); | |
516 | return; | |
96518518 | 517 | err: |
25e94a99 | 518 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
519 | } |
520 | ||
521 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
522 | struct netlink_callback *cb) | |
523 | { | |
524 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
525 | const struct nft_af_info *afi; | |
526 | const struct nft_table *table; | |
527 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 528 | struct net *net = sock_net(skb->sk); |
96518518 PM |
529 | int family = nfmsg->nfgen_family; |
530 | ||
e688a7f8 | 531 | rcu_read_lock(); |
38e029f1 PNA |
532 | cb->seq = net->nft.base_seq; |
533 | ||
e688a7f8 | 534 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
535 | if (family != NFPROTO_UNSPEC && family != afi->family) |
536 | continue; | |
537 | ||
e688a7f8 | 538 | list_for_each_entry_rcu(table, &afi->tables, list) { |
96518518 PM |
539 | if (idx < s_idx) |
540 | goto cont; | |
541 | if (idx > s_idx) | |
542 | memset(&cb->args[1], 0, | |
543 | sizeof(cb->args) - sizeof(cb->args[0])); | |
f2a6d766 PNA |
544 | if (!nft_is_active(net, table)) |
545 | continue; | |
84d7fce6 | 546 | if (nf_tables_fill_table_info(skb, net, |
96518518 PM |
547 | NETLINK_CB(cb->skb).portid, |
548 | cb->nlh->nlmsg_seq, | |
549 | NFT_MSG_NEWTABLE, | |
550 | NLM_F_MULTI, | |
551 | afi->family, table) < 0) | |
552 | goto done; | |
38e029f1 PNA |
553 | |
554 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
555 | cont: |
556 | idx++; | |
557 | } | |
558 | } | |
559 | done: | |
e688a7f8 | 560 | rcu_read_unlock(); |
96518518 PM |
561 | cb->args[0] = idx; |
562 | return skb->len; | |
563 | } | |
564 | ||
7b8002a1 PNA |
565 | static int nf_tables_gettable(struct net *net, struct sock *nlsk, |
566 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
567 | const struct nlattr * const nla[], |
568 | struct netlink_ext_ack *extack) | |
96518518 PM |
569 | { |
570 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 571 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
572 | const struct nft_af_info *afi; |
573 | const struct nft_table *table; | |
574 | struct sk_buff *skb2; | |
575 | int family = nfmsg->nfgen_family; | |
576 | int err; | |
577 | ||
578 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
579 | struct netlink_dump_control c = { | |
580 | .dump = nf_tables_dump_tables, | |
581 | }; | |
582 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
583 | } | |
584 | ||
99633ab2 | 585 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
586 | if (IS_ERR(afi)) |
587 | return PTR_ERR(afi); | |
588 | ||
f2a6d766 | 589 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
590 | if (IS_ERR(table)) |
591 | return PTR_ERR(table); | |
592 | ||
593 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
594 | if (!skb2) | |
595 | return -ENOMEM; | |
596 | ||
84d7fce6 | 597 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
598 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
599 | family, table); | |
600 | if (err < 0) | |
601 | goto err; | |
602 | ||
603 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
604 | ||
605 | err: | |
606 | kfree_skb(skb2); | |
607 | return err; | |
608 | } | |
609 | ||
10435c11 F |
610 | static void _nf_tables_table_disable(struct net *net, |
611 | const struct nft_af_info *afi, | |
612 | struct nft_table *table, | |
613 | u32 cnt) | |
614 | { | |
615 | struct nft_chain *chain; | |
616 | u32 i = 0; | |
617 | ||
618 | list_for_each_entry(chain, &table->chains, list) { | |
619 | if (!nft_is_active_next(net, chain)) | |
620 | continue; | |
f323d954 | 621 | if (!nft_is_base_chain(chain)) |
10435c11 F |
622 | continue; |
623 | ||
624 | if (cnt && i++ == cnt) | |
625 | break; | |
626 | ||
627 | nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, | |
628 | afi->nops); | |
629 | } | |
630 | } | |
631 | ||
664b0f8c PNA |
632 | static int nf_tables_table_enable(struct net *net, |
633 | const struct nft_af_info *afi, | |
115a60b1 | 634 | struct nft_table *table) |
9ddf6323 PNA |
635 | { |
636 | struct nft_chain *chain; | |
637 | int err, i = 0; | |
638 | ||
639 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
640 | if (!nft_is_active_next(net, chain)) |
641 | continue; | |
f323d954 | 642 | if (!nft_is_base_chain(chain)) |
d2012975 PNA |
643 | continue; |
644 | ||
82bec71d PNA |
645 | err = nf_register_net_hooks(net, nft_base_chain(chain)->ops, |
646 | afi->nops); | |
9ddf6323 PNA |
647 | if (err < 0) |
648 | goto err; | |
649 | ||
650 | i++; | |
651 | } | |
652 | return 0; | |
653 | err: | |
10435c11 F |
654 | if (i) |
655 | _nf_tables_table_disable(net, afi, table, i); | |
9ddf6323 PNA |
656 | return err; |
657 | } | |
658 | ||
664b0f8c PNA |
659 | static void nf_tables_table_disable(struct net *net, |
660 | const struct nft_af_info *afi, | |
d8ee8f7c | 661 | struct nft_table *table) |
9ddf6323 | 662 | { |
10435c11 | 663 | _nf_tables_table_disable(net, afi, table, 0); |
9ddf6323 PNA |
664 | } |
665 | ||
e1aaca93 | 666 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 667 | { |
55dd6f93 | 668 | struct nft_trans *trans; |
e1aaca93 | 669 | u32 flags; |
55dd6f93 | 670 | int ret = 0; |
9ddf6323 | 671 | |
e1aaca93 PNA |
672 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
673 | return 0; | |
9ddf6323 | 674 | |
e1aaca93 PNA |
675 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
676 | if (flags & ~NFT_TABLE_F_DORMANT) | |
677 | return -EINVAL; | |
678 | ||
63283dd2 PNA |
679 | if (flags == ctx->table->flags) |
680 | return 0; | |
681 | ||
55dd6f93 PNA |
682 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
683 | sizeof(struct nft_trans_table)); | |
684 | if (trans == NULL) | |
685 | return -ENOMEM; | |
9ddf6323 | 686 | |
e1aaca93 PNA |
687 | if ((flags & NFT_TABLE_F_DORMANT) && |
688 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 689 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
690 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
691 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
664b0f8c | 692 | ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table); |
55dd6f93 | 693 | if (ret >= 0) { |
e1aaca93 | 694 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 695 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 696 | } |
9ddf6323 | 697 | } |
e1aaca93 PNA |
698 | if (ret < 0) |
699 | goto err; | |
9ddf6323 | 700 | |
55dd6f93 PNA |
701 | nft_trans_table_update(trans) = true; |
702 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
703 | return 0; | |
9ddf6323 | 704 | err: |
55dd6f93 | 705 | nft_trans_destroy(trans); |
9ddf6323 PNA |
706 | return ret; |
707 | } | |
708 | ||
633c9a84 PNA |
709 | static int nf_tables_newtable(struct net *net, struct sock *nlsk, |
710 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
711 | const struct nlattr * const nla[], |
712 | struct netlink_ext_ack *extack) | |
96518518 PM |
713 | { |
714 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 715 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
716 | const struct nlattr *name; |
717 | struct nft_af_info *afi; | |
718 | struct nft_table *table; | |
719 | int family = nfmsg->nfgen_family; | |
c5c1f975 | 720 | u32 flags = 0; |
e1aaca93 | 721 | struct nft_ctx ctx; |
55dd6f93 | 722 | int err; |
96518518 | 723 | |
99633ab2 | 724 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
725 | if (IS_ERR(afi)) |
726 | return PTR_ERR(afi); | |
727 | ||
728 | name = nla[NFTA_TABLE_NAME]; | |
f2a6d766 | 729 | table = nf_tables_table_lookup(afi, name, genmask); |
96518518 PM |
730 | if (IS_ERR(table)) { |
731 | if (PTR_ERR(table) != -ENOENT) | |
732 | return PTR_ERR(table); | |
1a28ad74 | 733 | } else { |
96518518 PM |
734 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
735 | return -EEXIST; | |
736 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
737 | return -EOPNOTSUPP; | |
e1aaca93 | 738 | |
633c9a84 | 739 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
e1aaca93 | 740 | return nf_tables_updtable(&ctx); |
96518518 PM |
741 | } |
742 | ||
c5c1f975 PM |
743 | if (nla[NFTA_TABLE_FLAGS]) { |
744 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
745 | if (flags & ~NFT_TABLE_F_DORMANT) | |
746 | return -EINVAL; | |
747 | } | |
748 | ||
ebddf1a8 | 749 | err = -EAFNOSUPPORT; |
7047f9d0 | 750 | if (!try_module_get(afi->owner)) |
ebddf1a8 | 751 | goto err1; |
7047f9d0 | 752 | |
ffdb210e | 753 | err = -ENOMEM; |
1cae565e | 754 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
ffdb210e | 755 | if (table == NULL) |
ebddf1a8 | 756 | goto err2; |
96518518 | 757 | |
e46abbcc PS |
758 | table->name = nla_strdup(name, GFP_KERNEL); |
759 | if (table->name == NULL) | |
760 | goto err3; | |
761 | ||
96518518 | 762 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 763 | INIT_LIST_HEAD(&table->sets); |
e5009240 | 764 | INIT_LIST_HEAD(&table->objects); |
c5c1f975 | 765 | table->flags = flags; |
9ddf6323 | 766 | |
633c9a84 | 767 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
55dd6f93 | 768 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
ffdb210e | 769 | if (err < 0) |
e46abbcc | 770 | goto err4; |
ffdb210e | 771 | |
e688a7f8 | 772 | list_add_tail_rcu(&table->list, &afi->tables); |
96518518 | 773 | return 0; |
e46abbcc PS |
774 | err4: |
775 | kfree(table->name); | |
ebddf1a8 | 776 | err3: |
ffdb210e | 777 | kfree(table); |
ebddf1a8 | 778 | err2: |
ffdb210e | 779 | module_put(afi->owner); |
ebddf1a8 | 780 | err1: |
ffdb210e | 781 | return err; |
96518518 PM |
782 | } |
783 | ||
b9ac12ef AB |
784 | static int nft_flush_table(struct nft_ctx *ctx) |
785 | { | |
786 | int err; | |
787 | struct nft_chain *chain, *nc; | |
e5009240 | 788 | struct nft_object *obj, *ne; |
b9ac12ef AB |
789 | struct nft_set *set, *ns; |
790 | ||
a2f18db0 | 791 | list_for_each_entry(chain, &ctx->table->chains, list) { |
664b0f8c PNA |
792 | if (!nft_is_active_next(ctx->net, chain)) |
793 | continue; | |
794 | ||
b9ac12ef AB |
795 | ctx->chain = chain; |
796 | ||
797 | err = nft_delrule_by_chain(ctx); | |
798 | if (err < 0) | |
799 | goto out; | |
b9ac12ef AB |
800 | } |
801 | ||
802 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
37a9cc52 PNA |
803 | if (!nft_is_active_next(ctx->net, set)) |
804 | continue; | |
805 | ||
b9ac12ef AB |
806 | if (set->flags & NFT_SET_ANONYMOUS && |
807 | !list_empty(&set->bindings)) | |
808 | continue; | |
809 | ||
810 | err = nft_delset(ctx, set); | |
811 | if (err < 0) | |
812 | goto out; | |
813 | } | |
814 | ||
e5009240 PNA |
815 | list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { |
816 | err = nft_delobj(ctx, obj); | |
817 | if (err < 0) | |
818 | goto out; | |
819 | } | |
820 | ||
a2f18db0 | 821 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
664b0f8c PNA |
822 | if (!nft_is_active_next(ctx->net, chain)) |
823 | continue; | |
824 | ||
a2f18db0 PNA |
825 | ctx->chain = chain; |
826 | ||
827 | err = nft_delchain(ctx); | |
828 | if (err < 0) | |
829 | goto out; | |
830 | } | |
831 | ||
b9ac12ef AB |
832 | err = nft_deltable(ctx); |
833 | out: | |
834 | return err; | |
835 | } | |
836 | ||
837 | static int nft_flush(struct nft_ctx *ctx, int family) | |
838 | { | |
839 | struct nft_af_info *afi; | |
840 | struct nft_table *table, *nt; | |
841 | const struct nlattr * const *nla = ctx->nla; | |
842 | int err = 0; | |
843 | ||
844 | list_for_each_entry(afi, &ctx->net->nft.af_info, list) { | |
845 | if (family != AF_UNSPEC && afi->family != family) | |
846 | continue; | |
847 | ||
848 | ctx->afi = afi; | |
849 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
f2a6d766 PNA |
850 | if (!nft_is_active_next(ctx->net, table)) |
851 | continue; | |
852 | ||
b9ac12ef AB |
853 | if (nla[NFTA_TABLE_NAME] && |
854 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
855 | continue; | |
856 | ||
857 | ctx->table = table; | |
858 | ||
859 | err = nft_flush_table(ctx); | |
860 | if (err < 0) | |
861 | goto out; | |
862 | } | |
863 | } | |
864 | out: | |
865 | return err; | |
866 | } | |
867 | ||
633c9a84 PNA |
868 | static int nf_tables_deltable(struct net *net, struct sock *nlsk, |
869 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
870 | const struct nlattr * const nla[], |
871 | struct netlink_ext_ack *extack) | |
96518518 PM |
872 | { |
873 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 874 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
875 | struct nft_af_info *afi; |
876 | struct nft_table *table; | |
ee01d542 | 877 | int family = nfmsg->nfgen_family; |
55dd6f93 | 878 | struct nft_ctx ctx; |
96518518 | 879 | |
633c9a84 | 880 | nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla); |
b9ac12ef AB |
881 | if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL) |
882 | return nft_flush(&ctx, family); | |
883 | ||
99633ab2 | 884 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
885 | if (IS_ERR(afi)) |
886 | return PTR_ERR(afi); | |
887 | ||
f2a6d766 | 888 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
889 | if (IS_ERR(table)) |
890 | return PTR_ERR(table); | |
96518518 | 891 | |
a8278400 PNA |
892 | if (nlh->nlmsg_flags & NLM_F_NONREC && |
893 | table->use > 0) | |
894 | return -EBUSY; | |
895 | ||
b9ac12ef AB |
896 | ctx.afi = afi; |
897 | ctx.table = table; | |
55dd6f93 | 898 | |
b9ac12ef | 899 | return nft_flush_table(&ctx); |
96518518 PM |
900 | } |
901 | ||
55dd6f93 PNA |
902 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
903 | { | |
4fefee57 PNA |
904 | BUG_ON(ctx->table->use > 0); |
905 | ||
e46abbcc | 906 | kfree(ctx->table->name); |
55dd6f93 PNA |
907 | kfree(ctx->table); |
908 | module_put(ctx->afi->owner); | |
909 | } | |
910 | ||
2a37d755 | 911 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 912 | { |
9370761c | 913 | int err = 0; |
96518518 | 914 | |
d8297d4f FW |
915 | if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO)) |
916 | return -EINVAL; | |
917 | ||
96518518 | 918 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c PNA |
919 | if (chain_type[ctype->family][ctype->type] != NULL) { |
920 | err = -EBUSY; | |
921 | goto out; | |
96518518 | 922 | } |
9370761c PNA |
923 | chain_type[ctype->family][ctype->type] = ctype; |
924 | out: | |
96518518 PM |
925 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
926 | return err; | |
927 | } | |
9370761c | 928 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 929 | |
2a37d755 | 930 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 931 | { |
96518518 | 932 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 933 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
934 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
935 | } | |
9370761c | 936 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
937 | |
938 | /* | |
939 | * Chains | |
940 | */ | |
941 | ||
942 | static struct nft_chain * | |
664b0f8c PNA |
943 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle, |
944 | u8 genmask) | |
96518518 PM |
945 | { |
946 | struct nft_chain *chain; | |
947 | ||
948 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
949 | if (chain->handle == handle && |
950 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
951 | return chain; |
952 | } | |
953 | ||
954 | return ERR_PTR(-ENOENT); | |
955 | } | |
956 | ||
957 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
664b0f8c PNA |
958 | const struct nlattr *nla, |
959 | u8 genmask) | |
96518518 PM |
960 | { |
961 | struct nft_chain *chain; | |
962 | ||
963 | if (nla == NULL) | |
964 | return ERR_PTR(-EINVAL); | |
965 | ||
966 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
967 | if (!nla_strcmp(nla, chain->name) && |
968 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
969 | return chain; |
970 | } | |
971 | ||
972 | return ERR_PTR(-ENOENT); | |
973 | } | |
974 | ||
975 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
b2fbd044 LZ |
976 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, |
977 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
978 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
979 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
980 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
981 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 982 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 983 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 984 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
985 | }; |
986 | ||
987 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
988 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
989 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
2cbce139 PNA |
990 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
991 | .len = IFNAMSIZ - 1 }, | |
96518518 PM |
992 | }; |
993 | ||
0ca743a5 PNA |
994 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
995 | { | |
996 | struct nft_stats *cpu_stats, total; | |
997 | struct nlattr *nest; | |
ce355e20 ED |
998 | unsigned int seq; |
999 | u64 pkts, bytes; | |
0ca743a5 PNA |
1000 | int cpu; |
1001 | ||
1002 | memset(&total, 0, sizeof(total)); | |
1003 | for_each_possible_cpu(cpu) { | |
1004 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
1005 | do { |
1006 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
1007 | pkts = cpu_stats->pkts; | |
1008 | bytes = cpu_stats->bytes; | |
1009 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
1010 | total.pkts += pkts; | |
1011 | total.bytes += bytes; | |
0ca743a5 PNA |
1012 | } |
1013 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
1014 | if (nest == NULL) | |
1015 | goto nla_put_failure; | |
1016 | ||
b46f6ded ND |
1017 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), |
1018 | NFTA_COUNTER_PAD) || | |
1019 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), | |
1020 | NFTA_COUNTER_PAD)) | |
0ca743a5 PNA |
1021 | goto nla_put_failure; |
1022 | ||
1023 | nla_nest_end(skb, nest); | |
1024 | return 0; | |
1025 | ||
1026 | nla_put_failure: | |
1027 | return -ENOSPC; | |
1028 | } | |
1029 | ||
84d7fce6 PNA |
1030 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
1031 | u32 portid, u32 seq, int event, u32 flags, | |
1032 | int family, const struct nft_table *table, | |
96518518 PM |
1033 | const struct nft_chain *chain) |
1034 | { | |
1035 | struct nlmsghdr *nlh; | |
1036 | struct nfgenmsg *nfmsg; | |
1037 | ||
dedb67c4 | 1038 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
1039 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
1040 | if (nlh == NULL) | |
1041 | goto nla_put_failure; | |
1042 | ||
1043 | nfmsg = nlmsg_data(nlh); | |
1044 | nfmsg->nfgen_family = family; | |
1045 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1046 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1047 | |
1048 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
1049 | goto nla_put_failure; | |
b46f6ded ND |
1050 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), |
1051 | NFTA_CHAIN_PAD)) | |
96518518 PM |
1052 | goto nla_put_failure; |
1053 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
1054 | goto nla_put_failure; | |
1055 | ||
f323d954 | 1056 | if (nft_is_base_chain(chain)) { |
0ca743a5 | 1057 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 1058 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
1059 | struct nlattr *nest; |
1060 | ||
1061 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
1062 | if (nest == NULL) |
1063 | goto nla_put_failure; | |
1064 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
1065 | goto nla_put_failure; | |
1066 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
1067 | goto nla_put_failure; | |
2cbce139 PNA |
1068 | if (basechain->dev_name[0] && |
1069 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) | |
1070 | goto nla_put_failure; | |
96518518 | 1071 | nla_nest_end(skb, nest); |
9370761c | 1072 | |
0ca743a5 PNA |
1073 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
1074 | htonl(basechain->policy))) | |
1075 | goto nla_put_failure; | |
1076 | ||
baae3e62 PM |
1077 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
1078 | goto nla_put_failure; | |
0ca743a5 | 1079 | |
5f9bfe0e | 1080 | if (basechain->stats && nft_dump_stats(skb, basechain->stats)) |
0ca743a5 | 1081 | goto nla_put_failure; |
96518518 PM |
1082 | } |
1083 | ||
0ca743a5 PNA |
1084 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
1085 | goto nla_put_failure; | |
1086 | ||
053c095a JB |
1087 | nlmsg_end(skb, nlh); |
1088 | return 0; | |
96518518 PM |
1089 | |
1090 | nla_put_failure: | |
1091 | nlmsg_trim(skb, nlh); | |
1092 | return -1; | |
1093 | } | |
1094 | ||
25e94a99 | 1095 | static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
1096 | { |
1097 | struct sk_buff *skb; | |
96518518 PM |
1098 | int err; |
1099 | ||
128ad332 PNA |
1100 | if (!ctx->report && |
1101 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 1102 | return; |
96518518 | 1103 | |
96518518 PM |
1104 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1105 | if (skb == NULL) | |
1106 | goto err; | |
1107 | ||
84d7fce6 PNA |
1108 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
1109 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1110 | ctx->chain); |
96518518 PM |
1111 | if (err < 0) { |
1112 | kfree_skb(skb); | |
1113 | goto err; | |
1114 | } | |
1115 | ||
25e94a99 PNA |
1116 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1117 | ctx->report, GFP_KERNEL); | |
1118 | return; | |
96518518 | 1119 | err: |
25e94a99 | 1120 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
1121 | } |
1122 | ||
1123 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1124 | struct netlink_callback *cb) | |
1125 | { | |
1126 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1127 | const struct nft_af_info *afi; | |
1128 | const struct nft_table *table; | |
1129 | const struct nft_chain *chain; | |
1130 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1131 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1132 | int family = nfmsg->nfgen_family; |
1133 | ||
e688a7f8 | 1134 | rcu_read_lock(); |
38e029f1 PNA |
1135 | cb->seq = net->nft.base_seq; |
1136 | ||
e688a7f8 | 1137 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1138 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1139 | continue; | |
1140 | ||
e688a7f8 PNA |
1141 | list_for_each_entry_rcu(table, &afi->tables, list) { |
1142 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
96518518 PM |
1143 | if (idx < s_idx) |
1144 | goto cont; | |
1145 | if (idx > s_idx) | |
1146 | memset(&cb->args[1], 0, | |
1147 | sizeof(cb->args) - sizeof(cb->args[0])); | |
664b0f8c PNA |
1148 | if (!nft_is_active(net, chain)) |
1149 | continue; | |
84d7fce6 PNA |
1150 | if (nf_tables_fill_chain_info(skb, net, |
1151 | NETLINK_CB(cb->skb).portid, | |
96518518 PM |
1152 | cb->nlh->nlmsg_seq, |
1153 | NFT_MSG_NEWCHAIN, | |
1154 | NLM_F_MULTI, | |
1155 | afi->family, table, chain) < 0) | |
1156 | goto done; | |
38e029f1 PNA |
1157 | |
1158 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
1159 | cont: |
1160 | idx++; | |
1161 | } | |
1162 | } | |
1163 | } | |
1164 | done: | |
e688a7f8 | 1165 | rcu_read_unlock(); |
96518518 PM |
1166 | cb->args[0] = idx; |
1167 | return skb->len; | |
1168 | } | |
1169 | ||
7b8002a1 PNA |
1170 | static int nf_tables_getchain(struct net *net, struct sock *nlsk, |
1171 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1172 | const struct nlattr * const nla[], |
1173 | struct netlink_ext_ack *extack) | |
96518518 PM |
1174 | { |
1175 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1176 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
1177 | const struct nft_af_info *afi; |
1178 | const struct nft_table *table; | |
1179 | const struct nft_chain *chain; | |
1180 | struct sk_buff *skb2; | |
1181 | int family = nfmsg->nfgen_family; | |
1182 | int err; | |
1183 | ||
1184 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1185 | struct netlink_dump_control c = { | |
1186 | .dump = nf_tables_dump_chains, | |
1187 | }; | |
1188 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1189 | } | |
1190 | ||
99633ab2 | 1191 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1192 | if (IS_ERR(afi)) |
1193 | return PTR_ERR(afi); | |
1194 | ||
f2a6d766 | 1195 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1196 | if (IS_ERR(table)) |
1197 | return PTR_ERR(table); | |
1198 | ||
664b0f8c | 1199 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1200 | if (IS_ERR(chain)) |
1201 | return PTR_ERR(chain); | |
1202 | ||
1203 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1204 | if (!skb2) | |
1205 | return -ENOMEM; | |
1206 | ||
84d7fce6 | 1207 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1208 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1209 | family, table, chain); | |
1210 | if (err < 0) | |
1211 | goto err; | |
1212 | ||
1213 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1214 | ||
1215 | err: | |
1216 | kfree_skb(skb2); | |
1217 | return err; | |
1218 | } | |
1219 | ||
0ca743a5 PNA |
1220 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1221 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1222 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1223 | }; | |
1224 | ||
ff3cd7b3 | 1225 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1226 | { |
1227 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1228 | struct nft_stats __percpu *newstats; | |
1229 | struct nft_stats *stats; | |
1230 | int err; | |
1231 | ||
fceb6435 JB |
1232 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy, |
1233 | NULL); | |
0ca743a5 | 1234 | if (err < 0) |
ff3cd7b3 | 1235 | return ERR_PTR(err); |
0ca743a5 PNA |
1236 | |
1237 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1238 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1239 | |
ce355e20 | 1240 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1241 | if (newstats == NULL) |
ff3cd7b3 | 1242 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1243 | |
1244 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1245 | * are not exposed to userspace. | |
1246 | */ | |
e8781f70 | 1247 | preempt_disable(); |
0ca743a5 PNA |
1248 | stats = this_cpu_ptr(newstats); |
1249 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1250 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1251 | preempt_enable(); |
0ca743a5 | 1252 | |
ff3cd7b3 PNA |
1253 | return newstats; |
1254 | } | |
1255 | ||
1256 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
1257 | struct nft_stats __percpu *newstats) | |
1258 | { | |
b88825de PNA |
1259 | if (newstats == NULL) |
1260 | return; | |
1261 | ||
0ca743a5 | 1262 | if (chain->stats) { |
0ca743a5 | 1263 | struct nft_stats __percpu *oldstats = |
67a8fc27 | 1264 | nft_dereference(chain->stats); |
0ca743a5 PNA |
1265 | |
1266 | rcu_assign_pointer(chain->stats, newstats); | |
1267 | synchronize_rcu(); | |
1268 | free_percpu(oldstats); | |
6a3cffc7 | 1269 | } else { |
0ca743a5 | 1270 | rcu_assign_pointer(chain->stats, newstats); |
6a3cffc7 TY |
1271 | static_branch_inc(&nft_counters_enabled); |
1272 | } | |
0ca743a5 PNA |
1273 | } |
1274 | ||
91c7b38d PNA |
1275 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
1276 | { | |
1277 | BUG_ON(chain->use > 0); | |
1278 | ||
f323d954 | 1279 | if (nft_is_base_chain(chain)) { |
2cbce139 PNA |
1280 | struct nft_base_chain *basechain = nft_base_chain(chain); |
1281 | ||
1282 | module_put(basechain->type->owner); | |
1283 | free_percpu(basechain->stats); | |
9f08ea84 PNA |
1284 | if (basechain->stats) |
1285 | static_branch_dec(&nft_counters_enabled); | |
2cbce139 PNA |
1286 | if (basechain->ops[0].dev != NULL) |
1287 | dev_put(basechain->ops[0].dev); | |
b7263e07 | 1288 | kfree(chain->name); |
2cbce139 | 1289 | kfree(basechain); |
91c7b38d | 1290 | } else { |
b7263e07 | 1291 | kfree(chain->name); |
91c7b38d PNA |
1292 | kfree(chain); |
1293 | } | |
1294 | } | |
1295 | ||
508f8ccd PNA |
1296 | struct nft_chain_hook { |
1297 | u32 num; | |
1298 | u32 priority; | |
1299 | const struct nf_chain_type *type; | |
1300 | struct net_device *dev; | |
1301 | }; | |
1302 | ||
1303 | static int nft_chain_parse_hook(struct net *net, | |
1304 | const struct nlattr * const nla[], | |
1305 | struct nft_af_info *afi, | |
1306 | struct nft_chain_hook *hook, bool create) | |
1307 | { | |
1308 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; | |
1309 | const struct nf_chain_type *type; | |
1310 | struct net_device *dev; | |
1311 | int err; | |
1312 | ||
1313 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
fceb6435 | 1314 | nft_hook_policy, NULL); |
508f8ccd PNA |
1315 | if (err < 0) |
1316 | return err; | |
1317 | ||
1318 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1319 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1320 | return -EINVAL; | |
1321 | ||
1322 | hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
1323 | if (hook->num >= afi->nhooks) | |
1324 | return -EINVAL; | |
1325 | ||
1326 | hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); | |
1327 | ||
1328 | type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT]; | |
1329 | if (nla[NFTA_CHAIN_TYPE]) { | |
1330 | type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE], | |
1331 | create); | |
1332 | if (IS_ERR(type)) | |
1333 | return PTR_ERR(type); | |
1334 | } | |
1335 | if (!(type->hook_mask & (1 << hook->num))) | |
1336 | return -EOPNOTSUPP; | |
1337 | if (!try_module_get(type->owner)) | |
1338 | return -ENOENT; | |
1339 | ||
1340 | hook->type = type; | |
1341 | ||
1342 | hook->dev = NULL; | |
1343 | if (afi->flags & NFT_AF_NEEDS_DEV) { | |
1344 | char ifname[IFNAMSIZ]; | |
1345 | ||
1346 | if (!ha[NFTA_HOOK_DEV]) { | |
1347 | module_put(type->owner); | |
1348 | return -EOPNOTSUPP; | |
1349 | } | |
1350 | ||
1351 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); | |
1352 | dev = dev_get_by_name(net, ifname); | |
1353 | if (!dev) { | |
1354 | module_put(type->owner); | |
1355 | return -ENOENT; | |
1356 | } | |
1357 | hook->dev = dev; | |
1358 | } else if (ha[NFTA_HOOK_DEV]) { | |
1359 | module_put(type->owner); | |
1360 | return -EOPNOTSUPP; | |
1361 | } | |
1362 | ||
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | static void nft_chain_release_hook(struct nft_chain_hook *hook) | |
1367 | { | |
1368 | module_put(hook->type->owner); | |
1369 | if (hook->dev != NULL) | |
1370 | dev_put(hook->dev); | |
1371 | } | |
1372 | ||
4035285f PNA |
1373 | static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask, |
1374 | u8 policy, bool create) | |
1375 | { | |
1376 | const struct nlattr * const *nla = ctx->nla; | |
1377 | struct nft_table *table = ctx->table; | |
1378 | struct nft_af_info *afi = ctx->afi; | |
1379 | struct nft_base_chain *basechain; | |
1380 | struct nft_stats __percpu *stats; | |
1381 | struct net *net = ctx->net; | |
1382 | struct nft_chain *chain; | |
1383 | unsigned int i; | |
1384 | int err; | |
1385 | ||
1386 | if (table->use == UINT_MAX) | |
1387 | return -EOVERFLOW; | |
1388 | ||
1389 | if (nla[NFTA_CHAIN_HOOK]) { | |
1390 | struct nft_chain_hook hook; | |
1391 | struct nf_hook_ops *ops; | |
1392 | nf_hookfn *hookfn; | |
1393 | ||
1394 | err = nft_chain_parse_hook(net, nla, afi, &hook, create); | |
1395 | if (err < 0) | |
1396 | return err; | |
1397 | ||
1398 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); | |
1399 | if (basechain == NULL) { | |
1400 | nft_chain_release_hook(&hook); | |
1401 | return -ENOMEM; | |
1402 | } | |
1403 | ||
1404 | if (hook.dev != NULL) | |
1405 | strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ); | |
1406 | ||
1407 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1408 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1409 | if (IS_ERR(stats)) { | |
1410 | nft_chain_release_hook(&hook); | |
1411 | kfree(basechain); | |
1412 | return PTR_ERR(stats); | |
1413 | } | |
1414 | basechain->stats = stats; | |
1415 | static_branch_inc(&nft_counters_enabled); | |
1416 | } | |
1417 | ||
1418 | hookfn = hook.type->hooks[hook.num]; | |
1419 | basechain->type = hook.type; | |
1420 | chain = &basechain->chain; | |
1421 | ||
1422 | for (i = 0; i < afi->nops; i++) { | |
1423 | ops = &basechain->ops[i]; | |
1424 | ops->pf = family; | |
1425 | ops->hooknum = hook.num; | |
1426 | ops->priority = hook.priority; | |
1427 | ops->priv = chain; | |
1428 | ops->hook = afi->hooks[ops->hooknum]; | |
1429 | ops->dev = hook.dev; | |
1430 | if (hookfn) | |
1431 | ops->hook = hookfn; | |
1432 | if (afi->hook_ops_init) | |
1433 | afi->hook_ops_init(ops, i); | |
1434 | } | |
1435 | ||
1436 | chain->flags |= NFT_BASE_CHAIN; | |
1437 | basechain->policy = policy; | |
1438 | } else { | |
1439 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1440 | if (chain == NULL) | |
1441 | return -ENOMEM; | |
1442 | } | |
1443 | INIT_LIST_HEAD(&chain->rules); | |
1444 | chain->handle = nf_tables_alloc_handle(table); | |
1445 | chain->table = table; | |
1446 | chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL); | |
1447 | if (!chain->name) { | |
1448 | err = -ENOMEM; | |
1449 | goto err1; | |
1450 | } | |
1451 | ||
1452 | err = nf_tables_register_hooks(net, table, chain, afi->nops); | |
1453 | if (err < 0) | |
1454 | goto err1; | |
1455 | ||
1456 | ctx->chain = chain; | |
1457 | err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN); | |
1458 | if (err < 0) | |
1459 | goto err2; | |
1460 | ||
1461 | table->use++; | |
1462 | list_add_tail_rcu(&chain->list, &table->chains); | |
1463 | ||
1464 | return 0; | |
1465 | err2: | |
1466 | nf_tables_unregister_hooks(net, table, chain, afi->nops); | |
1467 | err1: | |
1468 | nf_tables_chain_destroy(chain); | |
1469 | ||
1470 | return err; | |
1471 | } | |
1472 | ||
2c4a488a PNA |
1473 | static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy, |
1474 | bool create) | |
1475 | { | |
1476 | const struct nlattr * const *nla = ctx->nla; | |
1477 | struct nft_table *table = ctx->table; | |
1478 | struct nft_chain *chain = ctx->chain; | |
1479 | struct nft_af_info *afi = ctx->afi; | |
1480 | struct nft_base_chain *basechain; | |
1481 | struct nft_stats *stats = NULL; | |
1482 | struct nft_chain_hook hook; | |
1483 | const struct nlattr *name; | |
1484 | struct nf_hook_ops *ops; | |
1485 | struct nft_trans *trans; | |
1486 | int err, i; | |
1487 | ||
1488 | if (nla[NFTA_CHAIN_HOOK]) { | |
1489 | if (!nft_is_base_chain(chain)) | |
1490 | return -EBUSY; | |
1491 | ||
1492 | err = nft_chain_parse_hook(ctx->net, nla, ctx->afi, &hook, | |
1493 | create); | |
1494 | if (err < 0) | |
1495 | return err; | |
1496 | ||
1497 | basechain = nft_base_chain(chain); | |
1498 | if (basechain->type != hook.type) { | |
1499 | nft_chain_release_hook(&hook); | |
1500 | return -EBUSY; | |
1501 | } | |
1502 | ||
1503 | for (i = 0; i < afi->nops; i++) { | |
1504 | ops = &basechain->ops[i]; | |
1505 | if (ops->hooknum != hook.num || | |
1506 | ops->priority != hook.priority || | |
1507 | ops->dev != hook.dev) { | |
1508 | nft_chain_release_hook(&hook); | |
1509 | return -EBUSY; | |
1510 | } | |
1511 | } | |
1512 | nft_chain_release_hook(&hook); | |
1513 | } | |
1514 | ||
1515 | if (nla[NFTA_CHAIN_HANDLE] && | |
1516 | nla[NFTA_CHAIN_NAME]) { | |
1517 | struct nft_chain *chain2; | |
1518 | ||
1519 | chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], | |
1520 | genmask); | |
0d18779b JC |
1521 | if (!IS_ERR(chain2)) |
1522 | return -EEXIST; | |
2c4a488a PNA |
1523 | } |
1524 | ||
1525 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1526 | if (!nft_is_base_chain(chain)) | |
1527 | return -EOPNOTSUPP; | |
1528 | ||
1529 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1530 | if (IS_ERR(stats)) | |
1531 | return PTR_ERR(stats); | |
1532 | } | |
1533 | ||
1534 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, | |
1535 | sizeof(struct nft_trans_chain)); | |
1536 | if (trans == NULL) { | |
1537 | free_percpu(stats); | |
1538 | return -ENOMEM; | |
1539 | } | |
1540 | ||
1541 | nft_trans_chain_stats(trans) = stats; | |
1542 | nft_trans_chain_update(trans) = true; | |
1543 | ||
1544 | if (nla[NFTA_CHAIN_POLICY]) | |
1545 | nft_trans_chain_policy(trans) = policy; | |
1546 | else | |
1547 | nft_trans_chain_policy(trans) = -1; | |
1548 | ||
1549 | name = nla[NFTA_CHAIN_NAME]; | |
1550 | if (nla[NFTA_CHAIN_HANDLE] && name) { | |
1551 | nft_trans_chain_name(trans) = | |
1552 | nla_strdup(name, GFP_KERNEL); | |
1553 | if (!nft_trans_chain_name(trans)) { | |
1554 | kfree(trans); | |
1555 | free_percpu(stats); | |
1556 | return -ENOMEM; | |
1557 | } | |
1558 | } | |
1559 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
1560 | ||
1561 | return 0; | |
1562 | } | |
1563 | ||
633c9a84 PNA |
1564 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
1565 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1566 | const struct nlattr * const nla[], |
1567 | struct netlink_ext_ack *extack) | |
96518518 PM |
1568 | { |
1569 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1570 | const struct nlattr * uninitialized_var(name); | |
4035285f PNA |
1571 | u8 genmask = nft_genmask_next(net); |
1572 | int family = nfmsg->nfgen_family; | |
7c95f6d8 | 1573 | struct nft_af_info *afi; |
96518518 PM |
1574 | struct nft_table *table; |
1575 | struct nft_chain *chain; | |
57de2a0c | 1576 | u8 policy = NF_ACCEPT; |
4035285f | 1577 | struct nft_ctx ctx; |
96518518 | 1578 | u64 handle = 0; |
96518518 PM |
1579 | bool create; |
1580 | ||
1581 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1582 | ||
99633ab2 | 1583 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
1584 | if (IS_ERR(afi)) |
1585 | return PTR_ERR(afi); | |
1586 | ||
f2a6d766 | 1587 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1588 | if (IS_ERR(table)) |
1589 | return PTR_ERR(table); | |
1590 | ||
96518518 PM |
1591 | chain = NULL; |
1592 | name = nla[NFTA_CHAIN_NAME]; | |
1593 | ||
1594 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1595 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
664b0f8c | 1596 | chain = nf_tables_chain_lookup_byhandle(table, handle, genmask); |
96518518 PM |
1597 | if (IS_ERR(chain)) |
1598 | return PTR_ERR(chain); | |
1599 | } else { | |
664b0f8c | 1600 | chain = nf_tables_chain_lookup(table, name, genmask); |
96518518 PM |
1601 | if (IS_ERR(chain)) { |
1602 | if (PTR_ERR(chain) != -ENOENT) | |
1603 | return PTR_ERR(chain); | |
1604 | chain = NULL; | |
1605 | } | |
1606 | } | |
1607 | ||
57de2a0c | 1608 | if (nla[NFTA_CHAIN_POLICY]) { |
f323d954 PNA |
1609 | if (chain != NULL && |
1610 | !nft_is_base_chain(chain)) | |
d6b6cb1d PNA |
1611 | return -EOPNOTSUPP; |
1612 | ||
1613 | if (chain == NULL && | |
57de2a0c PM |
1614 | nla[NFTA_CHAIN_HOOK] == NULL) |
1615 | return -EOPNOTSUPP; | |
1616 | ||
8f46df18 | 1617 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1618 | switch (policy) { |
1619 | case NF_DROP: | |
1620 | case NF_ACCEPT: | |
1621 | break; | |
1622 | default: | |
1623 | return -EINVAL; | |
1624 | } | |
1625 | } | |
1626 | ||
4035285f PNA |
1627 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
1628 | ||
96518518 PM |
1629 | if (chain != NULL) { |
1630 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1631 | return -EEXIST; | |
1632 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1633 | return -EOPNOTSUPP; | |
1634 | ||
2c4a488a | 1635 | return nf_tables_updchain(&ctx, genmask, policy, create); |
96518518 PM |
1636 | } |
1637 | ||
4035285f | 1638 | return nf_tables_addchain(&ctx, family, genmask, policy, create); |
96518518 PM |
1639 | } |
1640 | ||
633c9a84 PNA |
1641 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
1642 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1643 | const struct nlattr * const nla[], |
1644 | struct netlink_ext_ack *extack) | |
96518518 PM |
1645 | { |
1646 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1647 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 1648 | struct nft_af_info *afi; |
96518518 PM |
1649 | struct nft_table *table; |
1650 | struct nft_chain *chain; | |
9dee1474 | 1651 | struct nft_rule *rule; |
96518518 | 1652 | int family = nfmsg->nfgen_family; |
91c7b38d | 1653 | struct nft_ctx ctx; |
9dee1474 PNA |
1654 | u32 use; |
1655 | int err; | |
96518518 | 1656 | |
99633ab2 | 1657 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1658 | if (IS_ERR(afi)) |
1659 | return PTR_ERR(afi); | |
1660 | ||
f2a6d766 | 1661 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1662 | if (IS_ERR(table)) |
1663 | return PTR_ERR(table); | |
1664 | ||
664b0f8c | 1665 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1666 | if (IS_ERR(chain)) |
1667 | return PTR_ERR(chain); | |
9dee1474 PNA |
1668 | |
1669 | if (nlh->nlmsg_flags & NLM_F_NONREC && | |
1670 | chain->use > 0) | |
96518518 PM |
1671 | return -EBUSY; |
1672 | ||
633c9a84 | 1673 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0165d932 | 1674 | |
9dee1474 PNA |
1675 | use = chain->use; |
1676 | list_for_each_entry(rule, &chain->rules, list) { | |
1677 | if (!nft_is_active_next(net, rule)) | |
1678 | continue; | |
1679 | use--; | |
1680 | ||
1681 | err = nft_delrule(&ctx, rule); | |
1682 | if (err < 0) | |
1683 | return err; | |
1684 | } | |
1685 | ||
1686 | /* There are rules and elements that are still holding references to us, | |
1687 | * we cannot do a recursive removal in this case. | |
1688 | */ | |
1689 | if (use > 0) | |
1690 | return -EBUSY; | |
1691 | ||
ee01d542 | 1692 | return nft_delchain(&ctx); |
96518518 PM |
1693 | } |
1694 | ||
96518518 PM |
1695 | /* |
1696 | * Expressions | |
1697 | */ | |
1698 | ||
1699 | /** | |
ef1f7df9 PM |
1700 | * nft_register_expr - register nf_tables expr type |
1701 | * @ops: expr type | |
96518518 | 1702 | * |
ef1f7df9 | 1703 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1704 | * success or a negative errno code otherwise. |
1705 | */ | |
ef1f7df9 | 1706 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1707 | { |
1708 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1709 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1710 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1711 | else |
e688a7f8 | 1712 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1713 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1714 | return 0; | |
1715 | } | |
1716 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1717 | ||
1718 | /** | |
ef1f7df9 PM |
1719 | * nft_unregister_expr - unregister nf_tables expr type |
1720 | * @ops: expr type | |
96518518 | 1721 | * |
ef1f7df9 | 1722 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1723 | */ |
ef1f7df9 | 1724 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1725 | { |
1726 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1727 | list_del_rcu(&type->list); |
96518518 PM |
1728 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1729 | } | |
1730 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1731 | ||
64d46806 PM |
1732 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1733 | struct nlattr *nla) | |
96518518 | 1734 | { |
ef1f7df9 | 1735 | const struct nft_expr_type *type; |
96518518 | 1736 | |
ef1f7df9 | 1737 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1738 | if (!nla_strcmp(nla, type->name) && |
1739 | (!type->family || type->family == family)) | |
ef1f7df9 | 1740 | return type; |
96518518 PM |
1741 | } |
1742 | return NULL; | |
1743 | } | |
1744 | ||
64d46806 PM |
1745 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1746 | struct nlattr *nla) | |
96518518 | 1747 | { |
ef1f7df9 | 1748 | const struct nft_expr_type *type; |
96518518 PM |
1749 | |
1750 | if (nla == NULL) | |
1751 | return ERR_PTR(-EINVAL); | |
1752 | ||
64d46806 | 1753 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1754 | if (type != NULL && try_module_get(type->owner)) |
1755 | return type; | |
96518518 PM |
1756 | |
1757 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1758 | if (type == NULL) { |
64d46806 PM |
1759 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1760 | request_module("nft-expr-%u-%.*s", family, | |
1761 | nla_len(nla), (char *)nla_data(nla)); | |
1762 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1763 | if (__nft_expr_type_get(family, nla)) | |
1764 | return ERR_PTR(-EAGAIN); | |
1765 | ||
96518518 PM |
1766 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1767 | request_module("nft-expr-%.*s", | |
1768 | nla_len(nla), (char *)nla_data(nla)); | |
1769 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1770 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1771 | return ERR_PTR(-EAGAIN); |
1772 | } | |
1773 | #endif | |
1774 | return ERR_PTR(-ENOENT); | |
1775 | } | |
1776 | ||
1777 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1778 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1779 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1780 | }; | |
1781 | ||
1782 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1783 | const struct nft_expr *expr) | |
1784 | { | |
ef1f7df9 | 1785 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1786 | goto nla_put_failure; |
1787 | ||
1788 | if (expr->ops->dump) { | |
1789 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1790 | if (data == NULL) | |
1791 | goto nla_put_failure; | |
1792 | if (expr->ops->dump(skb, expr) < 0) | |
1793 | goto nla_put_failure; | |
1794 | nla_nest_end(skb, data); | |
1795 | } | |
1796 | ||
1797 | return skb->len; | |
1798 | ||
1799 | nla_put_failure: | |
1800 | return -1; | |
1801 | }; | |
1802 | ||
0b2d8a7b PM |
1803 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
1804 | const struct nft_expr *expr) | |
1805 | { | |
1806 | struct nlattr *nest; | |
1807 | ||
1808 | nest = nla_nest_start(skb, attr); | |
1809 | if (!nest) | |
1810 | goto nla_put_failure; | |
1811 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1812 | goto nla_put_failure; | |
1813 | nla_nest_end(skb, nest); | |
1814 | return 0; | |
1815 | ||
1816 | nla_put_failure: | |
1817 | return -1; | |
1818 | } | |
1819 | ||
96518518 PM |
1820 | struct nft_expr_info { |
1821 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1822 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1823 | }; |
1824 | ||
0ca743a5 PNA |
1825 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1826 | const struct nlattr *nla, | |
96518518 PM |
1827 | struct nft_expr_info *info) |
1828 | { | |
ef1f7df9 | 1829 | const struct nft_expr_type *type; |
96518518 | 1830 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1831 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1832 | int err; |
1833 | ||
fceb6435 | 1834 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL); |
96518518 PM |
1835 | if (err < 0) |
1836 | return err; | |
1837 | ||
64d46806 | 1838 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1839 | if (IS_ERR(type)) |
1840 | return PTR_ERR(type); | |
1841 | ||
1842 | if (tb[NFTA_EXPR_DATA]) { | |
1843 | err = nla_parse_nested(info->tb, type->maxattr, | |
fceb6435 | 1844 | tb[NFTA_EXPR_DATA], type->policy, NULL); |
ef1f7df9 PM |
1845 | if (err < 0) |
1846 | goto err1; | |
1847 | } else | |
1848 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1849 | ||
1850 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1851 | ops = type->select_ops(ctx, |
1852 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1853 | if (IS_ERR(ops)) { |
1854 | err = PTR_ERR(ops); | |
1855 | goto err1; | |
1856 | } | |
1857 | } else | |
1858 | ops = type->ops; | |
1859 | ||
96518518 PM |
1860 | info->ops = ops; |
1861 | return 0; | |
ef1f7df9 PM |
1862 | |
1863 | err1: | |
1864 | module_put(type->owner); | |
1865 | return err; | |
96518518 PM |
1866 | } |
1867 | ||
1868 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1869 | const struct nft_expr_info *info, |
96518518 PM |
1870 | struct nft_expr *expr) |
1871 | { | |
1872 | const struct nft_expr_ops *ops = info->ops; | |
1873 | int err; | |
1874 | ||
1875 | expr->ops = ops; | |
1876 | if (ops->init) { | |
ef1f7df9 | 1877 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1878 | if (err < 0) |
1879 | goto err1; | |
1880 | } | |
1881 | ||
c56e3956 LZ |
1882 | if (ops->validate) { |
1883 | const struct nft_data *data = NULL; | |
1884 | ||
1885 | err = ops->validate(ctx, expr, &data); | |
1886 | if (err < 0) | |
1887 | goto err2; | |
1888 | } | |
1889 | ||
96518518 PM |
1890 | return 0; |
1891 | ||
c56e3956 LZ |
1892 | err2: |
1893 | if (ops->destroy) | |
1894 | ops->destroy(ctx, expr); | |
96518518 PM |
1895 | err1: |
1896 | expr->ops = NULL; | |
1897 | return err; | |
1898 | } | |
1899 | ||
62472bce PM |
1900 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1901 | struct nft_expr *expr) | |
96518518 PM |
1902 | { |
1903 | if (expr->ops->destroy) | |
62472bce | 1904 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1905 | module_put(expr->ops->type->owner); |
96518518 PM |
1906 | } |
1907 | ||
0b2d8a7b PM |
1908 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
1909 | const struct nlattr *nla) | |
1910 | { | |
1911 | struct nft_expr_info info; | |
1912 | struct nft_expr *expr; | |
1913 | int err; | |
1914 | ||
1915 | err = nf_tables_expr_parse(ctx, nla, &info); | |
1916 | if (err < 0) | |
1917 | goto err1; | |
1918 | ||
1919 | err = -ENOMEM; | |
1920 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
1921 | if (expr == NULL) | |
1922 | goto err2; | |
1923 | ||
1924 | err = nf_tables_newexpr(ctx, &info, expr); | |
1925 | if (err < 0) | |
6cafaf47 | 1926 | goto err3; |
0b2d8a7b PM |
1927 | |
1928 | return expr; | |
6cafaf47 LZ |
1929 | err3: |
1930 | kfree(expr); | |
0b2d8a7b PM |
1931 | err2: |
1932 | module_put(info.ops->type->owner); | |
1933 | err1: | |
1934 | return ERR_PTR(err); | |
1935 | } | |
1936 | ||
1937 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
1938 | { | |
1939 | nf_tables_expr_destroy(ctx, expr); | |
1940 | kfree(expr); | |
1941 | } | |
1942 | ||
96518518 PM |
1943 | /* |
1944 | * Rules | |
1945 | */ | |
1946 | ||
1947 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1948 | u64 handle) | |
1949 | { | |
1950 | struct nft_rule *rule; | |
1951 | ||
1952 | // FIXME: this sucks | |
1953 | list_for_each_entry(rule, &chain->rules, list) { | |
1954 | if (handle == rule->handle) | |
1955 | return rule; | |
1956 | } | |
1957 | ||
1958 | return ERR_PTR(-ENOENT); | |
1959 | } | |
1960 | ||
1961 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1962 | const struct nlattr *nla) | |
1963 | { | |
1964 | if (nla == NULL) | |
1965 | return ERR_PTR(-EINVAL); | |
1966 | ||
1967 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1968 | } | |
1969 | ||
1970 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
b2fbd044 LZ |
1971 | [NFTA_RULE_TABLE] = { .type = NLA_STRING, |
1972 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
1973 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
1974 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1975 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1976 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1977 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1978 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1979 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1980 | .len = NFT_USERDATA_MAXLEN }, | |
7018f184 | 1981 | [NFTA_RULE_ID] = { .type = NLA_U32 }, |
96518518 PM |
1982 | }; |
1983 | ||
84d7fce6 PNA |
1984 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
1985 | u32 portid, u32 seq, int event, | |
1986 | u32 flags, int family, | |
96518518 PM |
1987 | const struct nft_table *table, |
1988 | const struct nft_chain *chain, | |
1989 | const struct nft_rule *rule) | |
1990 | { | |
1991 | struct nlmsghdr *nlh; | |
1992 | struct nfgenmsg *nfmsg; | |
1993 | const struct nft_expr *expr, *next; | |
1994 | struct nlattr *list; | |
5e948466 | 1995 | const struct nft_rule *prule; |
dedb67c4 | 1996 | u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 | 1997 | |
dedb67c4 | 1998 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags); |
96518518 PM |
1999 | if (nlh == NULL) |
2000 | goto nla_put_failure; | |
2001 | ||
2002 | nfmsg = nlmsg_data(nlh); | |
2003 | nfmsg->nfgen_family = family; | |
2004 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2005 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
2006 | |
2007 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
2008 | goto nla_put_failure; | |
2009 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
2010 | goto nla_put_failure; | |
b46f6ded ND |
2011 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), |
2012 | NFTA_RULE_PAD)) | |
96518518 PM |
2013 | goto nla_put_failure; |
2014 | ||
5e948466 | 2015 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
cbbb40e2 | 2016 | prule = list_prev_entry(rule, list); |
5e948466 | 2017 | if (nla_put_be64(skb, NFTA_RULE_POSITION, |
b46f6ded ND |
2018 | cpu_to_be64(prule->handle), |
2019 | NFTA_RULE_PAD)) | |
5e948466 EL |
2020 | goto nla_put_failure; |
2021 | } | |
2022 | ||
96518518 PM |
2023 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
2024 | if (list == NULL) | |
2025 | goto nla_put_failure; | |
2026 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 2027 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 2028 | goto nla_put_failure; |
96518518 PM |
2029 | } |
2030 | nla_nest_end(skb, list); | |
2031 | ||
86f1ec32 PM |
2032 | if (rule->udata) { |
2033 | struct nft_userdata *udata = nft_userdata(rule); | |
2034 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
2035 | udata->data) < 0) | |
2036 | goto nla_put_failure; | |
2037 | } | |
0768b3b3 | 2038 | |
053c095a JB |
2039 | nlmsg_end(skb, nlh); |
2040 | return 0; | |
96518518 PM |
2041 | |
2042 | nla_put_failure: | |
2043 | nlmsg_trim(skb, nlh); | |
2044 | return -1; | |
2045 | } | |
2046 | ||
25e94a99 PNA |
2047 | static void nf_tables_rule_notify(const struct nft_ctx *ctx, |
2048 | const struct nft_rule *rule, int event) | |
96518518 PM |
2049 | { |
2050 | struct sk_buff *skb; | |
96518518 PM |
2051 | int err; |
2052 | ||
128ad332 PNA |
2053 | if (!ctx->report && |
2054 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 2055 | return; |
96518518 | 2056 | |
96518518 PM |
2057 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
2058 | if (skb == NULL) | |
2059 | goto err; | |
2060 | ||
84d7fce6 PNA |
2061 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
2062 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 2063 | ctx->chain, rule); |
96518518 PM |
2064 | if (err < 0) { |
2065 | kfree_skb(skb); | |
2066 | goto err; | |
2067 | } | |
2068 | ||
25e94a99 PNA |
2069 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
2070 | ctx->report, GFP_KERNEL); | |
2071 | return; | |
96518518 | 2072 | err: |
25e94a99 | 2073 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
2074 | } |
2075 | ||
6e1f760e | 2076 | struct nft_rule_dump_ctx { |
e46abbcc | 2077 | char *table; |
b7263e07 | 2078 | char *chain; |
6e1f760e PNA |
2079 | }; |
2080 | ||
96518518 PM |
2081 | static int nf_tables_dump_rules(struct sk_buff *skb, |
2082 | struct netlink_callback *cb) | |
2083 | { | |
2084 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
6e1f760e | 2085 | const struct nft_rule_dump_ctx *ctx = cb->data; |
96518518 PM |
2086 | const struct nft_af_info *afi; |
2087 | const struct nft_table *table; | |
2088 | const struct nft_chain *chain; | |
2089 | const struct nft_rule *rule; | |
2090 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 2091 | struct net *net = sock_net(skb->sk); |
96518518 PM |
2092 | int family = nfmsg->nfgen_family; |
2093 | ||
e688a7f8 | 2094 | rcu_read_lock(); |
38e029f1 PNA |
2095 | cb->seq = net->nft.base_seq; |
2096 | ||
e688a7f8 | 2097 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
2098 | if (family != NFPROTO_UNSPEC && family != afi->family) |
2099 | continue; | |
2100 | ||
e688a7f8 | 2101 | list_for_each_entry_rcu(table, &afi->tables, list) { |
e46abbcc | 2102 | if (ctx && ctx->table && |
6e1f760e PNA |
2103 | strcmp(ctx->table, table->name) != 0) |
2104 | continue; | |
2105 | ||
e688a7f8 | 2106 | list_for_each_entry_rcu(chain, &table->chains, list) { |
24c0df82 | 2107 | if (ctx && ctx->chain && |
6e1f760e PNA |
2108 | strcmp(ctx->chain, chain->name) != 0) |
2109 | continue; | |
2110 | ||
e688a7f8 | 2111 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
889f7ee7 | 2112 | if (!nft_is_active(net, rule)) |
0628b123 | 2113 | goto cont; |
96518518 PM |
2114 | if (idx < s_idx) |
2115 | goto cont; | |
2116 | if (idx > s_idx) | |
2117 | memset(&cb->args[1], 0, | |
2118 | sizeof(cb->args) - sizeof(cb->args[0])); | |
84d7fce6 | 2119 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, |
96518518 PM |
2120 | cb->nlh->nlmsg_seq, |
2121 | NFT_MSG_NEWRULE, | |
2122 | NLM_F_MULTI | NLM_F_APPEND, | |
2123 | afi->family, table, chain, rule) < 0) | |
2124 | goto done; | |
38e029f1 PNA |
2125 | |
2126 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
2127 | cont: |
2128 | idx++; | |
2129 | } | |
2130 | } | |
2131 | } | |
2132 | } | |
2133 | done: | |
e688a7f8 PNA |
2134 | rcu_read_unlock(); |
2135 | ||
96518518 PM |
2136 | cb->args[0] = idx; |
2137 | return skb->len; | |
2138 | } | |
2139 | ||
6e1f760e PNA |
2140 | static int nf_tables_dump_rules_done(struct netlink_callback *cb) |
2141 | { | |
e46abbcc PS |
2142 | struct nft_rule_dump_ctx *ctx = cb->data; |
2143 | ||
2144 | if (ctx) { | |
2145 | kfree(ctx->table); | |
b7263e07 | 2146 | kfree(ctx->chain); |
e46abbcc PS |
2147 | kfree(ctx); |
2148 | } | |
6e1f760e PNA |
2149 | return 0; |
2150 | } | |
2151 | ||
7b8002a1 PNA |
2152 | static int nf_tables_getrule(struct net *net, struct sock *nlsk, |
2153 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2154 | const struct nlattr * const nla[], |
2155 | struct netlink_ext_ack *extack) | |
96518518 PM |
2156 | { |
2157 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2158 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
2159 | const struct nft_af_info *afi; |
2160 | const struct nft_table *table; | |
2161 | const struct nft_chain *chain; | |
2162 | const struct nft_rule *rule; | |
2163 | struct sk_buff *skb2; | |
2164 | int family = nfmsg->nfgen_family; | |
2165 | int err; | |
2166 | ||
2167 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2168 | struct netlink_dump_control c = { | |
2169 | .dump = nf_tables_dump_rules, | |
6e1f760e | 2170 | .done = nf_tables_dump_rules_done, |
96518518 | 2171 | }; |
6e1f760e PNA |
2172 | |
2173 | if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { | |
2174 | struct nft_rule_dump_ctx *ctx; | |
2175 | ||
2176 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
2177 | if (!ctx) | |
2178 | return -ENOMEM; | |
2179 | ||
e46abbcc PS |
2180 | if (nla[NFTA_RULE_TABLE]) { |
2181 | ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], | |
2182 | GFP_KERNEL); | |
2183 | if (!ctx->table) { | |
2184 | kfree(ctx); | |
2185 | return -ENOMEM; | |
2186 | } | |
2187 | } | |
b7263e07 PS |
2188 | if (nla[NFTA_RULE_CHAIN]) { |
2189 | ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], | |
2190 | GFP_KERNEL); | |
2191 | if (!ctx->chain) { | |
2192 | kfree(ctx->table); | |
2193 | kfree(ctx); | |
2194 | return -ENOMEM; | |
2195 | } | |
2196 | } | |
6e1f760e PNA |
2197 | c.data = ctx; |
2198 | } | |
2199 | ||
96518518 PM |
2200 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2201 | } | |
2202 | ||
99633ab2 | 2203 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2204 | if (IS_ERR(afi)) |
2205 | return PTR_ERR(afi); | |
2206 | ||
f2a6d766 | 2207 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2208 | if (IS_ERR(table)) |
2209 | return PTR_ERR(table); | |
2210 | ||
664b0f8c | 2211 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2212 | if (IS_ERR(chain)) |
2213 | return PTR_ERR(chain); | |
2214 | ||
2215 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
2216 | if (IS_ERR(rule)) | |
2217 | return PTR_ERR(rule); | |
2218 | ||
2219 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2220 | if (!skb2) | |
2221 | return -ENOMEM; | |
2222 | ||
84d7fce6 | 2223 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
2224 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
2225 | family, table, chain, rule); | |
2226 | if (err < 0) | |
2227 | goto err; | |
2228 | ||
2229 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2230 | ||
2231 | err: | |
2232 | kfree_skb(skb2); | |
2233 | return err; | |
2234 | } | |
2235 | ||
62472bce PM |
2236 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
2237 | struct nft_rule *rule) | |
96518518 | 2238 | { |
96518518 PM |
2239 | struct nft_expr *expr; |
2240 | ||
2241 | /* | |
2242 | * Careful: some expressions might not be initialized in case this | |
2243 | * is called on error from nf_tables_newrule(). | |
2244 | */ | |
2245 | expr = nft_expr_first(rule); | |
3e38df13 | 2246 | while (expr != nft_expr_last(rule) && expr->ops) { |
62472bce | 2247 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
2248 | expr = nft_expr_next(expr); |
2249 | } | |
2250 | kfree(rule); | |
2251 | } | |
2252 | ||
aa06e0ca PNA |
2253 | static void nf_tables_rule_release(const struct nft_ctx *ctx, |
2254 | struct nft_rule *rule) | |
2255 | { | |
2256 | nft_rule_expr_deactivate(ctx, rule); | |
2257 | nf_tables_rule_destroy(ctx, rule); | |
2258 | } | |
2259 | ||
1081d11b PNA |
2260 | #define NFT_RULE_MAXEXPRS 128 |
2261 | ||
2262 | static struct nft_expr_info *info; | |
2263 | ||
633c9a84 PNA |
2264 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
2265 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2266 | const struct nlattr * const nla[], |
2267 | struct netlink_ext_ack *extack) | |
96518518 PM |
2268 | { |
2269 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2270 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2271 | struct nft_af_info *afi; |
96518518 PM |
2272 | struct nft_table *table; |
2273 | struct nft_chain *chain; | |
2274 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 2275 | struct nft_userdata *udata; |
1081d11b | 2276 | struct nft_trans *trans = NULL; |
96518518 PM |
2277 | struct nft_expr *expr; |
2278 | struct nft_ctx ctx; | |
2279 | struct nlattr *tmp; | |
86f1ec32 | 2280 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 PM |
2281 | int err, rem; |
2282 | bool create; | |
5e948466 | 2283 | u64 handle, pos_handle; |
96518518 PM |
2284 | |
2285 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
2286 | ||
99633ab2 | 2287 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
2288 | if (IS_ERR(afi)) |
2289 | return PTR_ERR(afi); | |
2290 | ||
f2a6d766 | 2291 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2292 | if (IS_ERR(table)) |
2293 | return PTR_ERR(table); | |
2294 | ||
664b0f8c | 2295 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2296 | if (IS_ERR(chain)) |
2297 | return PTR_ERR(chain); | |
2298 | ||
2299 | if (nla[NFTA_RULE_HANDLE]) { | |
2300 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
2301 | rule = __nf_tables_rule_lookup(chain, handle); | |
2302 | if (IS_ERR(rule)) | |
2303 | return PTR_ERR(rule); | |
2304 | ||
2305 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2306 | return -EEXIST; | |
2307 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2308 | old_rule = rule; | |
2309 | else | |
2310 | return -EOPNOTSUPP; | |
2311 | } else { | |
2312 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
2313 | return -EINVAL; | |
2314 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
2315 | |
2316 | if (chain->use == UINT_MAX) | |
2317 | return -EOVERFLOW; | |
96518518 PM |
2318 | } |
2319 | ||
5e948466 EL |
2320 | if (nla[NFTA_RULE_POSITION]) { |
2321 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2322 | return -EOPNOTSUPP; | |
2323 | ||
2324 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
2325 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
2326 | if (IS_ERR(old_rule)) | |
2327 | return PTR_ERR(old_rule); | |
2328 | } | |
2329 | ||
633c9a84 | 2330 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0ca743a5 | 2331 | |
96518518 PM |
2332 | n = 0; |
2333 | size = 0; | |
2334 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2335 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
2336 | err = -EINVAL; | |
2337 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2338 | goto err1; | |
2339 | if (n == NFT_RULE_MAXEXPRS) | |
2340 | goto err1; | |
0ca743a5 | 2341 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2342 | if (err < 0) |
2343 | goto err1; | |
2344 | size += info[n].ops->size; | |
2345 | n++; | |
2346 | } | |
2347 | } | |
9889840f PM |
2348 | /* Check for overflow of dlen field */ |
2349 | err = -EFBIG; | |
2350 | if (size >= 1 << 12) | |
2351 | goto err1; | |
96518518 | 2352 | |
86f1ec32 | 2353 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2354 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2355 | if (ulen > 0) |
2356 | usize = sizeof(struct nft_userdata) + ulen; | |
2357 | } | |
0768b3b3 | 2358 | |
96518518 | 2359 | err = -ENOMEM; |
86f1ec32 | 2360 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2361 | if (rule == NULL) |
2362 | goto err1; | |
2363 | ||
889f7ee7 | 2364 | nft_activate_next(net, rule); |
0628b123 | 2365 | |
96518518 PM |
2366 | rule->handle = handle; |
2367 | rule->dlen = size; | |
86f1ec32 | 2368 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2369 | |
86f1ec32 PM |
2370 | if (ulen) { |
2371 | udata = nft_userdata(rule); | |
2372 | udata->len = ulen - 1; | |
2373 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2374 | } | |
96518518 | 2375 | |
96518518 PM |
2376 | expr = nft_expr_first(rule); |
2377 | for (i = 0; i < n; i++) { | |
2378 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2379 | if (err < 0) | |
2380 | goto err2; | |
ef1f7df9 | 2381 | info[i].ops = NULL; |
96518518 PM |
2382 | expr = nft_expr_next(expr); |
2383 | } | |
2384 | ||
96518518 | 2385 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
9bdeedc0 | 2386 | if (!nft_is_active_next(net, old_rule)) { |
0628b123 PNA |
2387 | err = -ENOENT; |
2388 | goto err2; | |
2389 | } | |
9bdeedc0 FW |
2390 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
2391 | old_rule); | |
2392 | if (trans == NULL) { | |
2393 | err = -ENOMEM; | |
2394 | goto err2; | |
2395 | } | |
2396 | nft_deactivate_next(net, old_rule); | |
2397 | chain->use--; | |
96518518 | 2398 | |
9bdeedc0 FW |
2399 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
2400 | err = -ENOMEM; | |
2401 | goto err2; | |
2402 | } | |
2403 | ||
2404 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2405 | } else { | |
2406 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { | |
2407 | err = -ENOMEM; | |
2408 | goto err2; | |
2409 | } | |
2410 | ||
2411 | if (nlh->nlmsg_flags & NLM_F_APPEND) { | |
2412 | if (old_rule) | |
2413 | list_add_rcu(&rule->list, &old_rule->list); | |
2414 | else | |
2415 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2416 | } else { | |
2417 | if (old_rule) | |
2418 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2419 | else | |
2420 | list_add_rcu(&rule->list, &chain->rules); | |
2421 | } | |
0628b123 | 2422 | } |
4fefee57 | 2423 | chain->use++; |
96518518 PM |
2424 | return 0; |
2425 | ||
2426 | err2: | |
aa06e0ca | 2427 | nf_tables_rule_release(&ctx, rule); |
96518518 PM |
2428 | err1: |
2429 | for (i = 0; i < n; i++) { | |
2430 | if (info[i].ops != NULL) | |
ef1f7df9 | 2431 | module_put(info[i].ops->type->owner); |
96518518 PM |
2432 | } |
2433 | return err; | |
2434 | } | |
2435 | ||
1a94e38d PNA |
2436 | static struct nft_rule *nft_rule_lookup_byid(const struct net *net, |
2437 | const struct nlattr *nla) | |
2438 | { | |
2439 | u32 id = ntohl(nla_get_be32(nla)); | |
2440 | struct nft_trans *trans; | |
2441 | ||
2442 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
2443 | struct nft_rule *rule = nft_trans_rule(trans); | |
2444 | ||
2445 | if (trans->msg_type == NFT_MSG_NEWRULE && | |
2446 | id == nft_trans_rule_id(trans)) | |
2447 | return rule; | |
2448 | } | |
2449 | return ERR_PTR(-ENOENT); | |
2450 | } | |
2451 | ||
633c9a84 PNA |
2452 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
2453 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2454 | const struct nlattr * const nla[], |
2455 | struct netlink_ext_ack *extack) | |
96518518 PM |
2456 | { |
2457 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2458 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2459 | struct nft_af_info *afi; |
7c95f6d8 | 2460 | struct nft_table *table; |
cf9dc09d PNA |
2461 | struct nft_chain *chain = NULL; |
2462 | struct nft_rule *rule; | |
0628b123 PNA |
2463 | int family = nfmsg->nfgen_family, err = 0; |
2464 | struct nft_ctx ctx; | |
96518518 | 2465 | |
99633ab2 | 2466 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2467 | if (IS_ERR(afi)) |
2468 | return PTR_ERR(afi); | |
2469 | ||
f2a6d766 | 2470 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2471 | if (IS_ERR(table)) |
2472 | return PTR_ERR(table); | |
2473 | ||
cf9dc09d | 2474 | if (nla[NFTA_RULE_CHAIN]) { |
664b0f8c PNA |
2475 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], |
2476 | genmask); | |
cf9dc09d PNA |
2477 | if (IS_ERR(chain)) |
2478 | return PTR_ERR(chain); | |
2479 | } | |
96518518 | 2480 | |
633c9a84 | 2481 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0628b123 | 2482 | |
cf9dc09d PNA |
2483 | if (chain) { |
2484 | if (nla[NFTA_RULE_HANDLE]) { | |
2485 | rule = nf_tables_rule_lookup(chain, | |
2486 | nla[NFTA_RULE_HANDLE]); | |
2487 | if (IS_ERR(rule)) | |
2488 | return PTR_ERR(rule); | |
96518518 | 2489 | |
1a94e38d PNA |
2490 | err = nft_delrule(&ctx, rule); |
2491 | } else if (nla[NFTA_RULE_ID]) { | |
2492 | rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]); | |
2493 | if (IS_ERR(rule)) | |
2494 | return PTR_ERR(rule); | |
2495 | ||
5e266fe7 | 2496 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2497 | } else { |
ce24b721 | 2498 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2499 | } |
2500 | } else { | |
2501 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
2502 | if (!nft_is_active_next(net, chain)) |
2503 | continue; | |
2504 | ||
cf9dc09d | 2505 | ctx.chain = chain; |
ce24b721 | 2506 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2507 | if (err < 0) |
2508 | break; | |
2509 | } | |
2510 | } | |
2511 | ||
2512 | return err; | |
2513 | } | |
2514 | ||
20a69341 PM |
2515 | /* |
2516 | * Sets | |
2517 | */ | |
2518 | ||
2b664957 | 2519 | static LIST_HEAD(nf_tables_set_types); |
20a69341 | 2520 | |
2b664957 | 2521 | int nft_register_set(struct nft_set_type *type) |
20a69341 PM |
2522 | { |
2523 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2524 | list_add_tail_rcu(&type->list, &nf_tables_set_types); |
20a69341 PM |
2525 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2526 | return 0; | |
2527 | } | |
2528 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2529 | ||
2b664957 | 2530 | void nft_unregister_set(struct nft_set_type *type) |
20a69341 PM |
2531 | { |
2532 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2533 | list_del_rcu(&type->list); |
20a69341 PM |
2534 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2535 | } | |
2536 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2537 | ||
2b664957 PNA |
2538 | #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ |
2539 | NFT_SET_TIMEOUT | NFT_SET_OBJECT) | |
2540 | ||
2541 | static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags) | |
2542 | { | |
2543 | return (flags & ops->features) == (flags & NFT_SET_FEATURES); | |
2544 | } | |
2545 | ||
c50b960c PM |
2546 | /* |
2547 | * Select a set implementation based on the data characteristics and the | |
2548 | * given policy. The total memory use might not be known if no size is | |
2549 | * given, in that case the amount of memory per element is used. | |
2550 | */ | |
2551 | static const struct nft_set_ops * | |
2b664957 PNA |
2552 | nft_select_set_ops(const struct nft_ctx *ctx, |
2553 | const struct nlattr * const nla[], | |
c50b960c PM |
2554 | const struct nft_set_desc *desc, |
2555 | enum nft_set_policies policy) | |
20a69341 | 2556 | { |
c50b960c PM |
2557 | const struct nft_set_ops *ops, *bops; |
2558 | struct nft_set_estimate est, best; | |
2b664957 PNA |
2559 | const struct nft_set_type *type; |
2560 | u32 flags = 0; | |
20a69341 PM |
2561 | |
2562 | #ifdef CONFIG_MODULES | |
2b664957 | 2563 | if (list_empty(&nf_tables_set_types)) { |
20a69341 PM |
2564 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2565 | request_module("nft-set"); | |
2566 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2567 | if (!list_empty(&nf_tables_set_types)) |
20a69341 PM |
2568 | return ERR_PTR(-EAGAIN); |
2569 | } | |
2570 | #endif | |
2b664957 PNA |
2571 | if (nla[NFTA_SET_FLAGS] != NULL) |
2572 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
20a69341 | 2573 | |
55af753c PNA |
2574 | bops = NULL; |
2575 | best.size = ~0; | |
2576 | best.lookup = ~0; | |
0b5a7874 | 2577 | best.space = ~0; |
c50b960c | 2578 | |
2b664957 PNA |
2579 | list_for_each_entry(type, &nf_tables_set_types, list) { |
2580 | if (!type->select_ops) | |
2581 | ops = type->ops; | |
2582 | else | |
2583 | ops = type->select_ops(ctx, desc, flags); | |
2584 | if (!ops) | |
2585 | continue; | |
2586 | ||
2587 | if (!nft_set_ops_candidate(ops, flags)) | |
20a69341 | 2588 | continue; |
2b664957 | 2589 | if (!ops->estimate(desc, flags, &est)) |
c50b960c PM |
2590 | continue; |
2591 | ||
2592 | switch (policy) { | |
2593 | case NFT_SET_POL_PERFORMANCE: | |
55af753c | 2594 | if (est.lookup < best.lookup) |
c50b960c | 2595 | break; |
644e334e PNA |
2596 | if (est.lookup == best.lookup && |
2597 | est.space < best.space) | |
2598 | break; | |
c50b960c PM |
2599 | continue; |
2600 | case NFT_SET_POL_MEMORY: | |
0b5a7874 PNA |
2601 | if (!desc->size) { |
2602 | if (est.space < best.space) | |
2603 | break; | |
2604 | if (est.space == best.space && | |
2605 | est.lookup < best.lookup) | |
2606 | break; | |
2607 | } else if (est.size < best.size) { | |
c50b960c | 2608 | break; |
0b5a7874 | 2609 | } |
c50b960c PM |
2610 | continue; |
2611 | default: | |
2612 | break; | |
2613 | } | |
2614 | ||
2b664957 | 2615 | if (!try_module_get(type->owner)) |
20a69341 | 2616 | continue; |
c50b960c | 2617 | if (bops != NULL) |
2b664957 | 2618 | module_put(bops->type->owner); |
c50b960c PM |
2619 | |
2620 | bops = ops; | |
2621 | best = est; | |
20a69341 PM |
2622 | } |
2623 | ||
c50b960c PM |
2624 | if (bops != NULL) |
2625 | return bops; | |
2626 | ||
20a69341 PM |
2627 | return ERR_PTR(-EOPNOTSUPP); |
2628 | } | |
2629 | ||
2630 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
b2fbd044 LZ |
2631 | [NFTA_SET_TABLE] = { .type = NLA_STRING, |
2632 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
a9bdd836 | 2633 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
cb39ad8b | 2634 | .len = NFT_SET_MAXNAMELEN - 1 }, |
20a69341 PM |
2635 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2636 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2637 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2638 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2639 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2640 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2641 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2642 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2643 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2644 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
e6d8ecac CFG |
2645 | [NFTA_SET_USERDATA] = { .type = NLA_BINARY, |
2646 | .len = NFT_USERDATA_MAXLEN }, | |
8aeff920 | 2647 | [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, |
c50b960c PM |
2648 | }; |
2649 | ||
2650 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2651 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2652 | }; |
2653 | ||
633c9a84 | 2654 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
2655 | const struct sk_buff *skb, |
2656 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
2657 | const struct nlattr * const nla[], |
2658 | u8 genmask) | |
20a69341 PM |
2659 | { |
2660 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
2661 | struct nft_af_info *afi = NULL; |
2662 | struct nft_table *table = NULL; | |
20a69341 | 2663 | |
c9c8e485 PNA |
2664 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
2665 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
2666 | if (IS_ERR(afi)) | |
2667 | return PTR_ERR(afi); | |
2668 | } | |
20a69341 PM |
2669 | |
2670 | if (nla[NFTA_SET_TABLE] != NULL) { | |
ec2c9935 PM |
2671 | if (afi == NULL) |
2672 | return -EAFNOSUPPORT; | |
2673 | ||
f2a6d766 PNA |
2674 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], |
2675 | genmask); | |
20a69341 PM |
2676 | if (IS_ERR(table)) |
2677 | return PTR_ERR(table); | |
2678 | } | |
2679 | ||
633c9a84 | 2680 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2681 | return 0; |
2682 | } | |
2683 | ||
c7a72e3f PNA |
2684 | static struct nft_set *nf_tables_set_lookup(const struct nft_table *table, |
2685 | const struct nlattr *nla, u8 genmask) | |
20a69341 PM |
2686 | { |
2687 | struct nft_set *set; | |
2688 | ||
2689 | if (nla == NULL) | |
2690 | return ERR_PTR(-EINVAL); | |
2691 | ||
2692 | list_for_each_entry(set, &table->sets, list) { | |
37a9cc52 PNA |
2693 | if (!nla_strcmp(nla, set->name) && |
2694 | nft_active_genmask(set, genmask)) | |
20a69341 PM |
2695 | return set; |
2696 | } | |
2697 | return ERR_PTR(-ENOENT); | |
2698 | } | |
2699 | ||
c7a72e3f PNA |
2700 | static struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
2701 | const struct nlattr *nla, | |
2702 | u8 genmask) | |
958bee14 PNA |
2703 | { |
2704 | struct nft_trans *trans; | |
2705 | u32 id = ntohl(nla_get_be32(nla)); | |
2706 | ||
2707 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
37a9cc52 PNA |
2708 | struct nft_set *set = nft_trans_set(trans); |
2709 | ||
958bee14 | 2710 | if (trans->msg_type == NFT_MSG_NEWSET && |
37a9cc52 PNA |
2711 | id == nft_trans_set_id(trans) && |
2712 | nft_active_genmask(set, genmask)) | |
2713 | return set; | |
958bee14 PNA |
2714 | } |
2715 | return ERR_PTR(-ENOENT); | |
2716 | } | |
c7a72e3f PNA |
2717 | |
2718 | struct nft_set *nft_set_lookup(const struct net *net, | |
2719 | const struct nft_table *table, | |
2720 | const struct nlattr *nla_set_name, | |
2721 | const struct nlattr *nla_set_id, | |
2722 | u8 genmask) | |
2723 | { | |
2724 | struct nft_set *set; | |
2725 | ||
2726 | set = nf_tables_set_lookup(table, nla_set_name, genmask); | |
2727 | if (IS_ERR(set)) { | |
2728 | if (!nla_set_id) | |
2729 | return set; | |
2730 | ||
2731 | set = nf_tables_set_lookup_byid(net, nla_set_id, genmask); | |
2732 | } | |
2733 | return set; | |
2734 | } | |
2735 | EXPORT_SYMBOL_GPL(nft_set_lookup); | |
958bee14 | 2736 | |
20a69341 PM |
2737 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
2738 | const char *name) | |
2739 | { | |
2740 | const struct nft_set *i; | |
2741 | const char *p; | |
2742 | unsigned long *inuse; | |
60eb1894 | 2743 | unsigned int n = 0, min = 0; |
20a69341 | 2744 | |
38745490 | 2745 | p = strchr(name, '%'); |
20a69341 PM |
2746 | if (p != NULL) { |
2747 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2748 | return -EINVAL; | |
2749 | ||
2750 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2751 | if (inuse == NULL) | |
2752 | return -ENOMEM; | |
60eb1894 | 2753 | cont: |
20a69341 | 2754 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2755 | int tmp; |
2756 | ||
37a9cc52 PNA |
2757 | if (!nft_is_active_next(ctx->net, set)) |
2758 | continue; | |
14662917 | 2759 | if (!sscanf(i->name, name, &tmp)) |
20a69341 | 2760 | continue; |
60eb1894 | 2761 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2762 | continue; |
14662917 | 2763 | |
60eb1894 | 2764 | set_bit(tmp - min, inuse); |
20a69341 PM |
2765 | } |
2766 | ||
53b70287 | 2767 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2768 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2769 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2770 | memset(inuse, 0, PAGE_SIZE); | |
2771 | goto cont; | |
2772 | } | |
20a69341 PM |
2773 | free_page((unsigned long)inuse); |
2774 | } | |
2775 | ||
38745490 PS |
2776 | set->name = kasprintf(GFP_KERNEL, name, min + n); |
2777 | if (!set->name) | |
2778 | return -ENOMEM; | |
2779 | ||
20a69341 | 2780 | list_for_each_entry(i, &ctx->table->sets, list) { |
37a9cc52 PNA |
2781 | if (!nft_is_active_next(ctx->net, i)) |
2782 | continue; | |
e63aaaa6 AY |
2783 | if (!strcmp(set->name, i->name)) { |
2784 | kfree(set->name); | |
20a69341 | 2785 | return -ENFILE; |
e63aaaa6 | 2786 | } |
20a69341 PM |
2787 | } |
2788 | return 0; | |
2789 | } | |
2790 | ||
2791 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2792 | const struct nft_set *set, u16 event, u16 flags) | |
2793 | { | |
2794 | struct nfgenmsg *nfmsg; | |
2795 | struct nlmsghdr *nlh; | |
c50b960c | 2796 | struct nlattr *desc; |
128ad332 PNA |
2797 | u32 portid = ctx->portid; |
2798 | u32 seq = ctx->seq; | |
20a69341 | 2799 | |
dedb67c4 | 2800 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
20a69341 PM |
2801 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
2802 | flags); | |
2803 | if (nlh == NULL) | |
2804 | goto nla_put_failure; | |
2805 | ||
2806 | nfmsg = nlmsg_data(nlh); | |
2807 | nfmsg->nfgen_family = ctx->afi->family; | |
2808 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2809 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
2810 | |
2811 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2812 | goto nla_put_failure; | |
2813 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2814 | goto nla_put_failure; | |
2815 | if (set->flags != 0) | |
2816 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2817 | goto nla_put_failure; | |
2818 | ||
2819 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2820 | goto nla_put_failure; | |
2821 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2822 | goto nla_put_failure; | |
2823 | if (set->flags & NFT_SET_MAP) { | |
2824 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2825 | goto nla_put_failure; | |
2826 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2827 | goto nla_put_failure; | |
2828 | } | |
8aeff920 PNA |
2829 | if (set->flags & NFT_SET_OBJECT && |
2830 | nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) | |
2831 | goto nla_put_failure; | |
20a69341 | 2832 | |
761da293 | 2833 | if (set->timeout && |
d3e2a111 AP |
2834 | nla_put_be64(skb, NFTA_SET_TIMEOUT, |
2835 | cpu_to_be64(jiffies_to_msecs(set->timeout)), | |
b46f6ded | 2836 | NFTA_SET_PAD)) |
761da293 PM |
2837 | goto nla_put_failure; |
2838 | if (set->gc_int && | |
2839 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
2840 | goto nla_put_failure; | |
2841 | ||
9363dc4b AB |
2842 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
2843 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
2844 | goto nla_put_failure; | |
2845 | } | |
2846 | ||
e6d8ecac CFG |
2847 | if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) |
2848 | goto nla_put_failure; | |
2849 | ||
c50b960c PM |
2850 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
2851 | if (desc == NULL) | |
2852 | goto nla_put_failure; | |
2853 | if (set->size && | |
2854 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
2855 | goto nla_put_failure; | |
2856 | nla_nest_end(skb, desc); | |
2857 | ||
053c095a JB |
2858 | nlmsg_end(skb, nlh); |
2859 | return 0; | |
20a69341 PM |
2860 | |
2861 | nla_put_failure: | |
2862 | nlmsg_trim(skb, nlh); | |
2863 | return -1; | |
2864 | } | |
2865 | ||
25e94a99 PNA |
2866 | static void nf_tables_set_notify(const struct nft_ctx *ctx, |
2867 | const struct nft_set *set, int event, | |
2868 | gfp_t gfp_flags) | |
20a69341 PM |
2869 | { |
2870 | struct sk_buff *skb; | |
128ad332 | 2871 | u32 portid = ctx->portid; |
20a69341 PM |
2872 | int err; |
2873 | ||
128ad332 PNA |
2874 | if (!ctx->report && |
2875 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 2876 | return; |
20a69341 | 2877 | |
31f8441c | 2878 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
2879 | if (skb == NULL) |
2880 | goto err; | |
2881 | ||
2882 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2883 | if (err < 0) { | |
2884 | kfree_skb(skb); | |
2885 | goto err; | |
2886 | } | |
2887 | ||
25e94a99 PNA |
2888 | nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report, |
2889 | gfp_flags); | |
2890 | return; | |
20a69341 | 2891 | err: |
25e94a99 | 2892 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
20a69341 PM |
2893 | } |
2894 | ||
5b96af77 | 2895 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
2896 | { |
2897 | const struct nft_set *set; | |
2898 | unsigned int idx, s_idx = cb->args[0]; | |
7c95f6d8 | 2899 | struct nft_af_info *afi; |
c9c8e485 PNA |
2900 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2901 | struct net *net = sock_net(skb->sk); | |
2902 | int cur_family = cb->args[3]; | |
5b96af77 | 2903 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
2904 | |
2905 | if (cb->args[1]) | |
2906 | return skb->len; | |
2907 | ||
e688a7f8 | 2908 | rcu_read_lock(); |
38e029f1 PNA |
2909 | cb->seq = net->nft.base_seq; |
2910 | ||
e688a7f8 | 2911 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
5b96af77 PNA |
2912 | if (ctx->afi && ctx->afi != afi) |
2913 | continue; | |
2914 | ||
c9c8e485 PNA |
2915 | if (cur_family) { |
2916 | if (afi->family != cur_family) | |
2917 | continue; | |
2918 | ||
2919 | cur_family = 0; | |
2920 | } | |
e688a7f8 | 2921 | list_for_each_entry_rcu(table, &afi->tables, list) { |
5b96af77 PNA |
2922 | if (ctx->table && ctx->table != table) |
2923 | continue; | |
2924 | ||
c9c8e485 PNA |
2925 | if (cur_table) { |
2926 | if (cur_table != table) | |
2927 | continue; | |
2928 | ||
2929 | cur_table = NULL; | |
2930 | } | |
c9c8e485 | 2931 | idx = 0; |
5b96af77 | 2932 | list_for_each_entry_rcu(set, &table->sets, list) { |
c9c8e485 PNA |
2933 | if (idx < s_idx) |
2934 | goto cont; | |
37a9cc52 PNA |
2935 | if (!nft_is_active(net, set)) |
2936 | goto cont; | |
5b96af77 PNA |
2937 | |
2938 | ctx_set = *ctx; | |
2939 | ctx_set.table = table; | |
2940 | ctx_set.afi = afi; | |
2941 | if (nf_tables_fill_set(skb, &ctx_set, set, | |
c9c8e485 PNA |
2942 | NFT_MSG_NEWSET, |
2943 | NLM_F_MULTI) < 0) { | |
2944 | cb->args[0] = idx; | |
2945 | cb->args[2] = (unsigned long) table; | |
2946 | cb->args[3] = afi->family; | |
2947 | goto done; | |
2948 | } | |
38e029f1 | 2949 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 PNA |
2950 | cont: |
2951 | idx++; | |
2952 | } | |
2953 | if (s_idx) | |
2954 | s_idx = 0; | |
2955 | } | |
2956 | } | |
2957 | cb->args[1] = 1; | |
2958 | done: | |
e688a7f8 | 2959 | rcu_read_unlock(); |
c9c8e485 PNA |
2960 | return skb->len; |
2961 | } | |
2962 | ||
5b96af77 | 2963 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 2964 | { |
5b96af77 PNA |
2965 | kfree(cb->data); |
2966 | return 0; | |
20a69341 PM |
2967 | } |
2968 | ||
7b8002a1 PNA |
2969 | static int nf_tables_getset(struct net *net, struct sock *nlsk, |
2970 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2971 | const struct nlattr * const nla[], |
2972 | struct netlink_ext_ack *extack) | |
20a69341 | 2973 | { |
f2a6d766 | 2974 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
2975 | const struct nft_set *set; |
2976 | struct nft_ctx ctx; | |
2977 | struct sk_buff *skb2; | |
c9c8e485 | 2978 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2979 | int err; |
2980 | ||
01cfa0a4 | 2981 | /* Verify existence before starting dump */ |
f2a6d766 | 2982 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
2983 | if (err < 0) |
2984 | return err; | |
2985 | ||
2986 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2987 | struct netlink_dump_control c = { | |
2988 | .dump = nf_tables_dump_sets, | |
5b96af77 | 2989 | .done = nf_tables_dump_sets_done, |
20a69341 | 2990 | }; |
5b96af77 PNA |
2991 | struct nft_ctx *ctx_dump; |
2992 | ||
2993 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); | |
2994 | if (ctx_dump == NULL) | |
2995 | return -ENOMEM; | |
2996 | ||
2997 | *ctx_dump = ctx; | |
2998 | c.data = ctx_dump; | |
2999 | ||
20a69341 PM |
3000 | return netlink_dump_start(nlsk, skb, nlh, &c); |
3001 | } | |
3002 | ||
c9c8e485 PNA |
3003 | /* Only accept unspec with dump */ |
3004 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
3005 | return -EAFNOSUPPORT; | |
eaa2bcd6 PT |
3006 | if (!nla[NFTA_SET_TABLE]) |
3007 | return -EINVAL; | |
c9c8e485 | 3008 | |
37a9cc52 | 3009 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3010 | if (IS_ERR(set)) |
3011 | return PTR_ERR(set); | |
3012 | ||
3013 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
3014 | if (skb2 == NULL) | |
3015 | return -ENOMEM; | |
3016 | ||
3017 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
3018 | if (err < 0) | |
3019 | goto err; | |
3020 | ||
3021 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
3022 | ||
3023 | err: | |
3024 | kfree_skb(skb2); | |
3025 | return err; | |
3026 | } | |
3027 | ||
c50b960c PM |
3028 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
3029 | struct nft_set_desc *desc, | |
3030 | const struct nlattr *nla) | |
3031 | { | |
3032 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
3033 | int err; | |
3034 | ||
fceb6435 JB |
3035 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, |
3036 | nft_set_desc_policy, NULL); | |
c50b960c PM |
3037 | if (err < 0) |
3038 | return err; | |
3039 | ||
3040 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
3041 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
3042 | ||
3043 | return 0; | |
3044 | } | |
3045 | ||
633c9a84 PNA |
3046 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
3047 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3048 | const struct nlattr * const nla[], |
3049 | struct netlink_ext_ack *extack) | |
20a69341 PM |
3050 | { |
3051 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 3052 | u8 genmask = nft_genmask_next(net); |
20a69341 | 3053 | const struct nft_set_ops *ops; |
7c95f6d8 | 3054 | struct nft_af_info *afi; |
20a69341 PM |
3055 | struct nft_table *table; |
3056 | struct nft_set *set; | |
3057 | struct nft_ctx ctx; | |
38745490 | 3058 | char *name; |
20a69341 PM |
3059 | unsigned int size; |
3060 | bool create; | |
761da293 | 3061 | u64 timeout; |
8aeff920 | 3062 | u32 ktype, dtype, flags, policy, gc_int, objtype; |
c50b960c | 3063 | struct nft_set_desc desc; |
e6d8ecac CFG |
3064 | unsigned char *udata; |
3065 | u16 udlen; | |
20a69341 PM |
3066 | int err; |
3067 | ||
3068 | if (nla[NFTA_SET_TABLE] == NULL || | |
3069 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
3070 | nla[NFTA_SET_KEY_LEN] == NULL || |
3071 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
3072 | return -EINVAL; |
3073 | ||
c50b960c PM |
3074 | memset(&desc, 0, sizeof(desc)); |
3075 | ||
20a69341 PM |
3076 | ktype = NFT_DATA_VALUE; |
3077 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
3078 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
3079 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
3080 | return -EINVAL; | |
3081 | } | |
3082 | ||
c50b960c | 3083 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 3084 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3085 | return -EINVAL; |
3086 | ||
3087 | flags = 0; | |
3088 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
3089 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
3090 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 | 3091 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
8aeff920 PNA |
3092 | NFT_SET_MAP | NFT_SET_EVAL | |
3093 | NFT_SET_OBJECT)) | |
20a69341 | 3094 | return -EINVAL; |
8aeff920 PNA |
3095 | /* Only one of these operations is supported */ |
3096 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) == | |
3097 | (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) | |
7c6c6e95 | 3098 | return -EOPNOTSUPP; |
20a69341 PM |
3099 | } |
3100 | ||
3101 | dtype = 0; | |
20a69341 PM |
3102 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
3103 | if (!(flags & NFT_SET_MAP)) | |
3104 | return -EINVAL; | |
3105 | ||
3106 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
3107 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
3108 | dtype != NFT_DATA_VERDICT) | |
3109 | return -EINVAL; | |
3110 | ||
3111 | if (dtype != NFT_DATA_VERDICT) { | |
3112 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
3113 | return -EINVAL; | |
c50b960c | 3114 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 3115 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3116 | return -EINVAL; |
3117 | } else | |
7d740264 | 3118 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
3119 | } else if (flags & NFT_SET_MAP) |
3120 | return -EINVAL; | |
3121 | ||
8aeff920 PNA |
3122 | if (nla[NFTA_SET_OBJ_TYPE] != NULL) { |
3123 | if (!(flags & NFT_SET_OBJECT)) | |
3124 | return -EINVAL; | |
3125 | ||
3126 | objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); | |
3127 | if (objtype == NFT_OBJECT_UNSPEC || | |
3128 | objtype > NFT_OBJECT_MAX) | |
3129 | return -EINVAL; | |
3130 | } else if (flags & NFT_SET_OBJECT) | |
3131 | return -EINVAL; | |
3132 | else | |
3133 | objtype = NFT_OBJECT_UNSPEC; | |
3134 | ||
761da293 PM |
3135 | timeout = 0; |
3136 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
3137 | if (!(flags & NFT_SET_TIMEOUT)) | |
3138 | return -EINVAL; | |
d3e2a111 AP |
3139 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3140 | nla[NFTA_SET_TIMEOUT]))); | |
761da293 PM |
3141 | } |
3142 | gc_int = 0; | |
3143 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
3144 | if (!(flags & NFT_SET_TIMEOUT)) | |
3145 | return -EINVAL; | |
3146 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
3147 | } | |
3148 | ||
c50b960c PM |
3149 | policy = NFT_SET_POL_PERFORMANCE; |
3150 | if (nla[NFTA_SET_POLICY] != NULL) | |
3151 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
3152 | ||
3153 | if (nla[NFTA_SET_DESC] != NULL) { | |
3154 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
3155 | if (err < 0) | |
3156 | return err; | |
3157 | } | |
3158 | ||
20a69341 PM |
3159 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
3160 | ||
99633ab2 | 3161 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
3162 | if (IS_ERR(afi)) |
3163 | return PTR_ERR(afi); | |
3164 | ||
f2a6d766 | 3165 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask); |
20a69341 PM |
3166 | if (IS_ERR(table)) |
3167 | return PTR_ERR(table); | |
3168 | ||
633c9a84 | 3169 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 | 3170 | |
37a9cc52 | 3171 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3172 | if (IS_ERR(set)) { |
3173 | if (PTR_ERR(set) != -ENOENT) | |
3174 | return PTR_ERR(set); | |
1a28ad74 | 3175 | } else { |
20a69341 PM |
3176 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
3177 | return -EEXIST; | |
3178 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
3179 | return -EOPNOTSUPP; | |
3180 | return 0; | |
3181 | } | |
3182 | ||
3183 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
3184 | return -ENOENT; | |
3185 | ||
2b664957 | 3186 | ops = nft_select_set_ops(&ctx, nla, &desc, policy); |
20a69341 PM |
3187 | if (IS_ERR(ops)) |
3188 | return PTR_ERR(ops); | |
3189 | ||
e6d8ecac CFG |
3190 | udlen = 0; |
3191 | if (nla[NFTA_SET_USERDATA]) | |
3192 | udlen = nla_len(nla[NFTA_SET_USERDATA]); | |
3193 | ||
20a69341 PM |
3194 | size = 0; |
3195 | if (ops->privsize != NULL) | |
347b408d | 3196 | size = ops->privsize(nla, &desc); |
20a69341 | 3197 | |
1ff75a3e PNA |
3198 | set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); |
3199 | if (!set) { | |
3200 | err = -ENOMEM; | |
20a69341 | 3201 | goto err1; |
1ff75a3e | 3202 | } |
20a69341 | 3203 | |
38745490 PS |
3204 | name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL); |
3205 | if (!name) { | |
3206 | err = -ENOMEM; | |
3207 | goto err2; | |
3208 | } | |
3209 | ||
20a69341 | 3210 | err = nf_tables_set_alloc_name(&ctx, set, name); |
38745490 | 3211 | kfree(name); |
20a69341 PM |
3212 | if (err < 0) |
3213 | goto err2; | |
3214 | ||
e6d8ecac CFG |
3215 | udata = NULL; |
3216 | if (udlen) { | |
3217 | udata = set->data + size; | |
3218 | nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); | |
3219 | } | |
3220 | ||
20a69341 PM |
3221 | INIT_LIST_HEAD(&set->bindings); |
3222 | set->ops = ops; | |
3223 | set->ktype = ktype; | |
c50b960c | 3224 | set->klen = desc.klen; |
20a69341 | 3225 | set->dtype = dtype; |
8aeff920 | 3226 | set->objtype = objtype; |
c50b960c | 3227 | set->dlen = desc.dlen; |
20a69341 | 3228 | set->flags = flags; |
c50b960c | 3229 | set->size = desc.size; |
9363dc4b | 3230 | set->policy = policy; |
e6d8ecac CFG |
3231 | set->udlen = udlen; |
3232 | set->udata = udata; | |
761da293 PM |
3233 | set->timeout = timeout; |
3234 | set->gc_int = gc_int; | |
20a69341 | 3235 | |
c50b960c | 3236 | err = ops->init(set, &desc, nla); |
20a69341 | 3237 | if (err < 0) |
903d9f9a | 3238 | goto err3; |
20a69341 | 3239 | |
958bee14 | 3240 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 | 3241 | if (err < 0) |
903d9f9a | 3242 | goto err4; |
20a69341 | 3243 | |
e688a7f8 | 3244 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 3245 | table->use++; |
20a69341 PM |
3246 | return 0; |
3247 | ||
903d9f9a | 3248 | err4: |
c17c3cdf | 3249 | ops->destroy(set); |
903d9f9a FW |
3250 | err3: |
3251 | kfree(set->name); | |
20a69341 | 3252 | err2: |
1ff75a3e | 3253 | kvfree(set); |
20a69341 | 3254 | err1: |
2b664957 | 3255 | module_put(ops->type->owner); |
20a69341 PM |
3256 | return err; |
3257 | } | |
3258 | ||
958bee14 | 3259 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 3260 | { |
20a69341 | 3261 | set->ops->destroy(set); |
2b664957 | 3262 | module_put(set->ops->type->owner); |
38745490 | 3263 | kfree(set->name); |
1ff75a3e | 3264 | kvfree(set); |
20a69341 PM |
3265 | } |
3266 | ||
958bee14 PNA |
3267 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
3268 | { | |
e688a7f8 | 3269 | list_del_rcu(&set->list); |
31f8441c | 3270 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
3271 | nft_set_destroy(set); |
3272 | } | |
3273 | ||
633c9a84 PNA |
3274 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
3275 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3276 | const struct nlattr * const nla[], |
3277 | struct netlink_ext_ack *extack) | |
20a69341 | 3278 | { |
c9c8e485 | 3279 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
f2a6d766 | 3280 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3281 | struct nft_set *set; |
3282 | struct nft_ctx ctx; | |
3283 | int err; | |
3284 | ||
ec2c9935 PM |
3285 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
3286 | return -EAFNOSUPPORT; | |
20a69341 PM |
3287 | if (nla[NFTA_SET_TABLE] == NULL) |
3288 | return -EINVAL; | |
3289 | ||
f2a6d766 | 3290 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3291 | if (err < 0) |
3292 | return err; | |
3293 | ||
37a9cc52 | 3294 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3295 | if (IS_ERR(set)) |
3296 | return PTR_ERR(set); | |
a8278400 PNA |
3297 | |
3298 | if (!list_empty(&set->bindings) || | |
3299 | (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) | |
20a69341 PM |
3300 | return -EBUSY; |
3301 | ||
ee01d542 | 3302 | return nft_delset(&ctx, set); |
20a69341 PM |
3303 | } |
3304 | ||
3305 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 3306 | struct nft_set *set, |
20a69341 | 3307 | const struct nft_set_iter *iter, |
de70185d | 3308 | struct nft_set_elem *elem) |
20a69341 | 3309 | { |
fe2811eb | 3310 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3311 | enum nft_registers dreg; |
3312 | ||
3313 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
3314 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
3315 | set->dtype == NFT_DATA_VERDICT ? | |
3316 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
3317 | set->dlen); | |
20a69341 PM |
3318 | } |
3319 | ||
3320 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3321 | struct nft_set_binding *binding) | |
3322 | { | |
3323 | struct nft_set_binding *i; | |
3324 | struct nft_set_iter iter; | |
3325 | ||
3326 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
3327 | return -EBUSY; | |
3328 | ||
11113e19 | 3329 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
3330 | /* If the set is already bound to the same chain all |
3331 | * jumps are already validated for that chain. | |
3332 | */ | |
3333 | list_for_each_entry(i, &set->bindings, list) { | |
a4684402 | 3334 | if (i->flags & NFT_SET_MAP && |
11113e19 | 3335 | i->chain == binding->chain) |
20a69341 PM |
3336 | goto bind; |
3337 | } | |
3338 | ||
8588ac09 | 3339 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
3340 | iter.skip = 0; |
3341 | iter.count = 0; | |
3342 | iter.err = 0; | |
3343 | iter.fn = nf_tables_bind_check_setelem; | |
3344 | ||
3345 | set->ops->walk(ctx, set, &iter); | |
a02f4248 | 3346 | if (iter.err < 0) |
20a69341 | 3347 | return iter.err; |
20a69341 PM |
3348 | } |
3349 | bind: | |
3350 | binding->chain = ctx->chain; | |
e688a7f8 | 3351 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
3352 | return 0; |
3353 | } | |
63aea290 | 3354 | EXPORT_SYMBOL_GPL(nf_tables_bind_set); |
20a69341 PM |
3355 | |
3356 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3357 | struct nft_set_binding *binding) | |
3358 | { | |
e688a7f8 | 3359 | list_del_rcu(&binding->list); |
20a69341 | 3360 | |
958bee14 | 3361 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
37a9cc52 | 3362 | nft_is_active(ctx->net, set)) |
20a69341 PM |
3363 | nf_tables_set_destroy(ctx, set); |
3364 | } | |
63aea290 | 3365 | EXPORT_SYMBOL_GPL(nf_tables_unbind_set); |
20a69341 | 3366 | |
3ac4c07a PM |
3367 | const struct nft_set_ext_type nft_set_ext_types[] = { |
3368 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 3369 | .align = __alignof__(u32), |
3ac4c07a PM |
3370 | }, |
3371 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 3372 | .align = __alignof__(u32), |
3ac4c07a | 3373 | }, |
f25ad2e9 PM |
3374 | [NFT_SET_EXT_EXPR] = { |
3375 | .align = __alignof__(struct nft_expr), | |
3376 | }, | |
8aeff920 PNA |
3377 | [NFT_SET_EXT_OBJREF] = { |
3378 | .len = sizeof(struct nft_object *), | |
3379 | .align = __alignof__(struct nft_object *), | |
3380 | }, | |
3ac4c07a PM |
3381 | [NFT_SET_EXT_FLAGS] = { |
3382 | .len = sizeof(u8), | |
3383 | .align = __alignof__(u8), | |
3384 | }, | |
c3e1b005 PM |
3385 | [NFT_SET_EXT_TIMEOUT] = { |
3386 | .len = sizeof(u64), | |
3387 | .align = __alignof__(u64), | |
3388 | }, | |
3389 | [NFT_SET_EXT_EXPIRATION] = { | |
3390 | .len = sizeof(unsigned long), | |
3391 | .align = __alignof__(unsigned long), | |
3392 | }, | |
68e942e8 PM |
3393 | [NFT_SET_EXT_USERDATA] = { |
3394 | .len = sizeof(struct nft_userdata), | |
3395 | .align = __alignof__(struct nft_userdata), | |
3396 | }, | |
3ac4c07a PM |
3397 | }; |
3398 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
3399 | ||
20a69341 PM |
3400 | /* |
3401 | * Set elements | |
3402 | */ | |
3403 | ||
3404 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
3405 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
3406 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
3407 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 3408 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
3409 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
3410 | .len = NFT_USERDATA_MAXLEN }, | |
7018f184 FW |
3411 | [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED }, |
3412 | [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING }, | |
20a69341 PM |
3413 | }; |
3414 | ||
3415 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
b2fbd044 LZ |
3416 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, |
3417 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
3418 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, | |
3419 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
20a69341 | 3420 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
958bee14 | 3421 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
3422 | }; |
3423 | ||
633c9a84 | 3424 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
3425 | const struct sk_buff *skb, |
3426 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
3427 | const struct nlattr * const nla[], |
3428 | u8 genmask) | |
20a69341 PM |
3429 | { |
3430 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
3431 | struct nft_af_info *afi; |
3432 | struct nft_table *table; | |
20a69341 | 3433 | |
99633ab2 | 3434 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
3435 | if (IS_ERR(afi)) |
3436 | return PTR_ERR(afi); | |
3437 | ||
f2a6d766 PNA |
3438 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE], |
3439 | genmask); | |
20a69341 PM |
3440 | if (IS_ERR(table)) |
3441 | return PTR_ERR(table); | |
3442 | ||
633c9a84 | 3443 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
3444 | return 0; |
3445 | } | |
3446 | ||
3447 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
3448 | const struct nft_set *set, | |
3449 | const struct nft_set_elem *elem) | |
3450 | { | |
fe2811eb | 3451 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3452 | unsigned char *b = skb_tail_pointer(skb); |
3453 | struct nlattr *nest; | |
3454 | ||
3455 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
3456 | if (nest == NULL) | |
3457 | goto nla_put_failure; | |
3458 | ||
fe2811eb PM |
3459 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
3460 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
3461 | goto nla_put_failure; |
3462 | ||
fe2811eb PM |
3463 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3464 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
3465 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
3466 | set->dlen) < 0) | |
3467 | goto nla_put_failure; | |
3468 | ||
f25ad2e9 PM |
3469 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3470 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3471 | goto nla_put_failure; | |
3472 | ||
8aeff920 PNA |
3473 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && |
3474 | nla_put_string(skb, NFTA_SET_ELEM_OBJREF, | |
3475 | (*nft_set_ext_obj(ext))->name) < 0) | |
3476 | goto nla_put_failure; | |
3477 | ||
fe2811eb PM |
3478 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3479 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3480 | htonl(*nft_set_ext_flags(ext)))) | |
3481 | goto nla_put_failure; | |
20a69341 | 3482 | |
c3e1b005 PM |
3483 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3484 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
d3e2a111 AP |
3485 | cpu_to_be64(jiffies_to_msecs( |
3486 | *nft_set_ext_timeout(ext))), | |
b46f6ded | 3487 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3488 | goto nla_put_failure; |
3489 | ||
3490 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
3491 | unsigned long expires, now = jiffies; | |
3492 | ||
3493 | expires = *nft_set_ext_expiration(ext); | |
3494 | if (time_before(now, expires)) | |
3495 | expires -= now; | |
3496 | else | |
3497 | expires = 0; | |
3498 | ||
3499 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
b46f6ded ND |
3500 | cpu_to_be64(jiffies_to_msecs(expires)), |
3501 | NFTA_SET_ELEM_PAD)) | |
c3e1b005 PM |
3502 | goto nla_put_failure; |
3503 | } | |
3504 | ||
68e942e8 PM |
3505 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3506 | struct nft_userdata *udata; | |
3507 | ||
3508 | udata = nft_set_ext_userdata(ext); | |
3509 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3510 | udata->len + 1, udata->data)) | |
3511 | goto nla_put_failure; | |
3512 | } | |
3513 | ||
20a69341 PM |
3514 | nla_nest_end(skb, nest); |
3515 | return 0; | |
3516 | ||
3517 | nla_put_failure: | |
3518 | nlmsg_trim(skb, b); | |
3519 | return -EMSGSIZE; | |
3520 | } | |
3521 | ||
3522 | struct nft_set_dump_args { | |
3523 | const struct netlink_callback *cb; | |
3524 | struct nft_set_iter iter; | |
3525 | struct sk_buff *skb; | |
3526 | }; | |
3527 | ||
3528 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
de70185d | 3529 | struct nft_set *set, |
20a69341 | 3530 | const struct nft_set_iter *iter, |
de70185d | 3531 | struct nft_set_elem *elem) |
20a69341 PM |
3532 | { |
3533 | struct nft_set_dump_args *args; | |
3534 | ||
3535 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3536 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3537 | } | |
3538 | ||
fa803605 LZ |
3539 | struct nft_set_dump_ctx { |
3540 | const struct nft_set *set; | |
3541 | struct nft_ctx ctx; | |
3542 | }; | |
3543 | ||
20a69341 PM |
3544 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
3545 | { | |
fa803605 | 3546 | struct nft_set_dump_ctx *dump_ctx = cb->data; |
633c9a84 | 3547 | struct net *net = sock_net(skb->sk); |
fa803605 LZ |
3548 | struct nft_af_info *afi; |
3549 | struct nft_table *table; | |
de70185d | 3550 | struct nft_set *set; |
20a69341 | 3551 | struct nft_set_dump_args args; |
fa803605 | 3552 | bool set_found = false; |
20a69341 PM |
3553 | struct nfgenmsg *nfmsg; |
3554 | struct nlmsghdr *nlh; | |
3555 | struct nlattr *nest; | |
3556 | u32 portid, seq; | |
fa803605 | 3557 | int event; |
20a69341 | 3558 | |
fa803605 LZ |
3559 | rcu_read_lock(); |
3560 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
3561 | if (afi != dump_ctx->ctx.afi) | |
3562 | continue; | |
20a69341 | 3563 | |
fa803605 LZ |
3564 | list_for_each_entry_rcu(table, &afi->tables, list) { |
3565 | if (table != dump_ctx->ctx.table) | |
3566 | continue; | |
20a69341 | 3567 | |
fa803605 LZ |
3568 | list_for_each_entry_rcu(set, &table->sets, list) { |
3569 | if (set == dump_ctx->set) { | |
3570 | set_found = true; | |
3571 | break; | |
3572 | } | |
3573 | } | |
3574 | break; | |
3575 | } | |
3576 | break; | |
3577 | } | |
3578 | ||
3579 | if (!set_found) { | |
3580 | rcu_read_unlock(); | |
3581 | return -ENOENT; | |
3582 | } | |
20a69341 | 3583 | |
dedb67c4 | 3584 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); |
20a69341 PM |
3585 | portid = NETLINK_CB(cb->skb).portid; |
3586 | seq = cb->nlh->nlmsg_seq; | |
3587 | ||
3588 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3589 | NLM_F_MULTI); | |
3590 | if (nlh == NULL) | |
3591 | goto nla_put_failure; | |
3592 | ||
3593 | nfmsg = nlmsg_data(nlh); | |
fa803605 | 3594 | nfmsg->nfgen_family = afi->family; |
20a69341 | 3595 | nfmsg->version = NFNETLINK_V0; |
fa803605 | 3596 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
20a69341 | 3597 | |
fa803605 | 3598 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) |
20a69341 PM |
3599 | goto nla_put_failure; |
3600 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3601 | goto nla_put_failure; | |
3602 | ||
3603 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3604 | if (nest == NULL) | |
3605 | goto nla_put_failure; | |
3606 | ||
8588ac09 PNA |
3607 | args.cb = cb; |
3608 | args.skb = skb; | |
fa803605 | 3609 | args.iter.genmask = nft_genmask_cur(net); |
8588ac09 PNA |
3610 | args.iter.skip = cb->args[0]; |
3611 | args.iter.count = 0; | |
3612 | args.iter.err = 0; | |
3613 | args.iter.fn = nf_tables_dump_setelem; | |
fa803605 LZ |
3614 | set->ops->walk(&dump_ctx->ctx, set, &args.iter); |
3615 | rcu_read_unlock(); | |
20a69341 PM |
3616 | |
3617 | nla_nest_end(skb, nest); | |
3618 | nlmsg_end(skb, nlh); | |
3619 | ||
3620 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3621 | return args.iter.err; | |
3622 | if (args.iter.count == cb->args[0]) | |
3623 | return 0; | |
3624 | ||
3625 | cb->args[0] = args.iter.count; | |
3626 | return skb->len; | |
3627 | ||
3628 | nla_put_failure: | |
fa803605 | 3629 | rcu_read_unlock(); |
20a69341 PM |
3630 | return -ENOSPC; |
3631 | } | |
3632 | ||
fa803605 LZ |
3633 | static int nf_tables_dump_set_done(struct netlink_callback *cb) |
3634 | { | |
3635 | kfree(cb->data); | |
3636 | return 0; | |
3637 | } | |
3638 | ||
d60ce62f AB |
3639 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
3640 | const struct nft_ctx *ctx, u32 seq, | |
3641 | u32 portid, int event, u16 flags, | |
3642 | const struct nft_set *set, | |
3643 | const struct nft_set_elem *elem) | |
3644 | { | |
3645 | struct nfgenmsg *nfmsg; | |
3646 | struct nlmsghdr *nlh; | |
3647 | struct nlattr *nest; | |
3648 | int err; | |
3649 | ||
dedb67c4 | 3650 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
d60ce62f AB |
3651 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
3652 | flags); | |
3653 | if (nlh == NULL) | |
3654 | goto nla_put_failure; | |
3655 | ||
3656 | nfmsg = nlmsg_data(nlh); | |
3657 | nfmsg->nfgen_family = ctx->afi->family; | |
3658 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 3659 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
3660 | |
3661 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3662 | goto nla_put_failure; | |
3663 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3664 | goto nla_put_failure; | |
3665 | ||
3666 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3667 | if (nest == NULL) | |
3668 | goto nla_put_failure; | |
3669 | ||
3670 | err = nf_tables_fill_setelem(skb, set, elem); | |
3671 | if (err < 0) | |
3672 | goto nla_put_failure; | |
3673 | ||
3674 | nla_nest_end(skb, nest); | |
3675 | ||
053c095a JB |
3676 | nlmsg_end(skb, nlh); |
3677 | return 0; | |
d60ce62f AB |
3678 | |
3679 | nla_put_failure: | |
3680 | nlmsg_trim(skb, nlh); | |
3681 | return -1; | |
3682 | } | |
3683 | ||
ba0e4d99 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 | ||
3700 | static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set, | |
3701 | const struct nlattr *attr) | |
3702 | { | |
3703 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3704 | const struct nft_set_ext *ext; | |
3705 | struct nft_data_desc desc; | |
3706 | struct nft_set_elem elem; | |
3707 | struct sk_buff *skb; | |
3708 | uint32_t flags = 0; | |
3709 | void *priv; | |
3710 | int err; | |
3711 | ||
3712 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3713 | nft_set_elem_policy, NULL); | |
3714 | if (err < 0) | |
3715 | return err; | |
3716 | ||
3717 | if (!nla[NFTA_SET_ELEM_KEY]) | |
3718 | return -EINVAL; | |
3719 | ||
3720 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
3721 | if (err < 0) | |
3722 | return err; | |
3723 | ||
3724 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, | |
3725 | nla[NFTA_SET_ELEM_KEY]); | |
3726 | if (err < 0) | |
3727 | return err; | |
3728 | ||
3729 | err = -EINVAL; | |
3730 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
3731 | return err; | |
3732 | ||
3733 | priv = set->ops->get(ctx->net, set, &elem, flags); | |
3734 | if (IS_ERR(priv)) | |
3735 | return PTR_ERR(priv); | |
3736 | ||
3737 | elem.priv = priv; | |
3738 | ext = nft_set_elem_ext(set, &elem); | |
3739 | ||
3740 | err = -ENOMEM; | |
3741 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
3742 | if (skb == NULL) | |
3743 | goto err1; | |
3744 | ||
3745 | err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid, | |
3746 | NFT_MSG_NEWSETELEM, 0, set, &elem); | |
3747 | if (err < 0) | |
3748 | goto err2; | |
3749 | ||
3750 | err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT); | |
3751 | /* This avoids a loop in nfnetlink. */ | |
3752 | if (err < 0) | |
3753 | goto err1; | |
3754 | ||
3755 | return 0; | |
3756 | err2: | |
3757 | kfree_skb(skb); | |
3758 | err1: | |
3759 | /* this avoids a loop in nfnetlink. */ | |
3760 | return err == -EAGAIN ? -ENOBUFS : err; | |
3761 | } | |
3762 | ||
3763 | static int nf_tables_getsetelem(struct net *net, struct sock *nlsk, | |
3764 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
3765 | const struct nlattr * const nla[], | |
3766 | struct netlink_ext_ack *extack) | |
3767 | { | |
3768 | u8 genmask = nft_genmask_cur(net); | |
3769 | struct nft_set *set; | |
3770 | struct nlattr *attr; | |
3771 | struct nft_ctx ctx; | |
3772 | int rem, err = 0; | |
3773 | ||
3774 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); | |
3775 | if (err < 0) | |
3776 | return err; | |
3777 | ||
3778 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], | |
3779 | genmask); | |
3780 | if (IS_ERR(set)) | |
3781 | return PTR_ERR(set); | |
3782 | ||
3783 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3784 | struct netlink_dump_control c = { | |
3785 | .dump = nf_tables_dump_set, | |
3786 | .done = nf_tables_dump_set_done, | |
3787 | }; | |
3788 | struct nft_set_dump_ctx *dump_ctx; | |
3789 | ||
3790 | dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL); | |
3791 | if (!dump_ctx) | |
3792 | return -ENOMEM; | |
3793 | ||
3794 | dump_ctx->set = set; | |
3795 | dump_ctx->ctx = ctx; | |
3796 | ||
3797 | c.data = dump_ctx; | |
3798 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
3799 | } | |
3800 | ||
3801 | if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) | |
3802 | return -EINVAL; | |
3803 | ||
3804 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3805 | err = nft_get_set_elem(&ctx, set, attr); | |
3806 | if (err < 0) | |
3807 | break; | |
3808 | } | |
3809 | ||
3810 | return err; | |
3811 | } | |
3812 | ||
25e94a99 PNA |
3813 | static void nf_tables_setelem_notify(const struct nft_ctx *ctx, |
3814 | const struct nft_set *set, | |
3815 | const struct nft_set_elem *elem, | |
3816 | int event, u16 flags) | |
d60ce62f | 3817 | { |
128ad332 PNA |
3818 | struct net *net = ctx->net; |
3819 | u32 portid = ctx->portid; | |
d60ce62f AB |
3820 | struct sk_buff *skb; |
3821 | int err; | |
3822 | ||
128ad332 | 3823 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
25e94a99 | 3824 | return; |
d60ce62f | 3825 | |
d60ce62f AB |
3826 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
3827 | if (skb == NULL) | |
3828 | goto err; | |
3829 | ||
3830 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
3831 | set, elem); | |
3832 | if (err < 0) { | |
3833 | kfree_skb(skb); | |
3834 | goto err; | |
3835 | } | |
3836 | ||
25e94a99 PNA |
3837 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
3838 | GFP_KERNEL); | |
3839 | return; | |
d60ce62f | 3840 | err: |
25e94a99 | 3841 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
d60ce62f AB |
3842 | } |
3843 | ||
60319eb1 PNA |
3844 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
3845 | int msg_type, | |
3846 | struct nft_set *set) | |
3847 | { | |
3848 | struct nft_trans *trans; | |
3849 | ||
3850 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
3851 | if (trans == NULL) | |
3852 | return NULL; | |
3853 | ||
3854 | nft_trans_elem_set(trans) = set; | |
3855 | return trans; | |
3856 | } | |
3857 | ||
22fe54d5 PM |
3858 | void *nft_set_elem_init(const struct nft_set *set, |
3859 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 3860 | const u32 *key, const u32 *data, |
22fe54d5 | 3861 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
3862 | { |
3863 | struct nft_set_ext *ext; | |
3864 | void *elem; | |
3865 | ||
3866 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
3867 | if (elem == NULL) | |
3868 | return NULL; | |
3869 | ||
3870 | ext = nft_set_elem_ext(set, elem); | |
3871 | nft_set_ext_init(ext, tmpl); | |
3872 | ||
3873 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
3874 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3875 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
3876 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
3877 | *nft_set_ext_expiration(ext) = | |
d3e2a111 | 3878 | jiffies + timeout; |
c3e1b005 PM |
3879 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) |
3880 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
3881 | |
3882 | return elem; | |
3883 | } | |
3884 | ||
61f9e292 LZ |
3885 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
3886 | bool destroy_expr) | |
61edafbb PM |
3887 | { |
3888 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3889 | ||
59105446 | 3890 | nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); |
61edafbb | 3891 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) |
59105446 | 3892 | nft_data_release(nft_set_ext_data(ext), set->dtype); |
61f9e292 | 3893 | if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) |
f25ad2e9 | 3894 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); |
8aeff920 PNA |
3895 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) |
3896 | (*nft_set_ext_obj(ext))->use--; | |
61edafbb PM |
3897 | kfree(elem); |
3898 | } | |
3899 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
3900 | ||
59105446 PNA |
3901 | /* Only called from commit path, nft_set_elem_deactivate() already deals with |
3902 | * the refcounting from the preparation phase. | |
3903 | */ | |
3904 | static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem) | |
3905 | { | |
3906 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3907 | ||
3908 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) | |
3909 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); | |
3910 | kfree(elem); | |
3911 | } | |
3912 | ||
60319eb1 | 3913 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
c016c7e4 | 3914 | const struct nlattr *attr, u32 nlmsg_flags) |
20a69341 PM |
3915 | { |
3916 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
8aeff920 | 3917 | u8 genmask = nft_genmask_next(ctx->net); |
20a69341 | 3918 | struct nft_data_desc d1, d2; |
fe2811eb | 3919 | struct nft_set_ext_tmpl tmpl; |
c016c7e4 | 3920 | struct nft_set_ext *ext, *ext2; |
20a69341 PM |
3921 | struct nft_set_elem elem; |
3922 | struct nft_set_binding *binding; | |
8aeff920 | 3923 | struct nft_object *obj = NULL; |
68e942e8 | 3924 | struct nft_userdata *udata; |
fe2811eb | 3925 | struct nft_data data; |
20a69341 | 3926 | enum nft_registers dreg; |
60319eb1 | 3927 | struct nft_trans *trans; |
0e9091d6 | 3928 | u32 flags = 0; |
c3e1b005 | 3929 | u64 timeout; |
68e942e8 | 3930 | u8 ulen; |
20a69341 PM |
3931 | int err; |
3932 | ||
3933 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 3934 | nft_set_elem_policy, NULL); |
20a69341 PM |
3935 | if (err < 0) |
3936 | return err; | |
3937 | ||
3938 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3939 | return -EINVAL; | |
3940 | ||
fe2811eb PM |
3941 | nft_set_ext_prepare(&tmpl); |
3942 | ||
0e9091d6 PNA |
3943 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); |
3944 | if (err < 0) | |
3945 | return err; | |
3946 | if (flags != 0) | |
3947 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
3948 | |
3949 | if (set->flags & NFT_SET_MAP) { | |
3950 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 3951 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 3952 | return -EINVAL; |
bd7fc645 | 3953 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 3954 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 3955 | return -EINVAL; |
20a69341 PM |
3956 | } else { |
3957 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
3958 | return -EINVAL; | |
3959 | } | |
3960 | ||
c3e1b005 PM |
3961 | timeout = 0; |
3962 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
3963 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
3964 | return -EINVAL; | |
d3e2a111 AP |
3965 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3966 | nla[NFTA_SET_ELEM_TIMEOUT]))); | |
c3e1b005 PM |
3967 | } else if (set->flags & NFT_SET_TIMEOUT) { |
3968 | timeout = set->timeout; | |
3969 | } | |
3970 | ||
7d740264 | 3971 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 3972 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3973 | if (err < 0) |
3974 | goto err1; | |
3975 | err = -EINVAL; | |
3976 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
3977 | goto err2; | |
3978 | ||
7d740264 | 3979 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
3980 | if (timeout > 0) { |
3981 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
3982 | if (timeout != set->timeout) | |
3983 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
3984 | } | |
fe2811eb | 3985 | |
8aeff920 PNA |
3986 | if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { |
3987 | if (!(set->flags & NFT_SET_OBJECT)) { | |
3988 | err = -EINVAL; | |
3989 | goto err2; | |
3990 | } | |
3991 | obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF], | |
3992 | set->objtype, genmask); | |
3993 | if (IS_ERR(obj)) { | |
3994 | err = PTR_ERR(obj); | |
3995 | goto err2; | |
3996 | } | |
3997 | nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); | |
3998 | } | |
3999 | ||
20a69341 | 4000 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
4001 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
4002 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
4003 | if (err < 0) |
4004 | goto err2; | |
4005 | ||
4006 | err = -EINVAL; | |
4007 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
4008 | goto err3; | |
4009 | ||
4010 | dreg = nft_type_to_reg(set->dtype); | |
4011 | list_for_each_entry(binding, &set->bindings, list) { | |
4012 | struct nft_ctx bind_ctx = { | |
58c78e10 | 4013 | .net = ctx->net, |
20a69341 PM |
4014 | .afi = ctx->afi, |
4015 | .table = ctx->table, | |
7c95f6d8 | 4016 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
4017 | }; |
4018 | ||
11113e19 PM |
4019 | if (!(binding->flags & NFT_SET_MAP)) |
4020 | continue; | |
4021 | ||
1ec10212 PM |
4022 | err = nft_validate_register_store(&bind_ctx, dreg, |
4023 | &data, | |
4024 | d2.type, d2.len); | |
20a69341 PM |
4025 | if (err < 0) |
4026 | goto err3; | |
4027 | } | |
fe2811eb | 4028 | |
7d740264 | 4029 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
4030 | } |
4031 | ||
68e942e8 PM |
4032 | /* The full maximum length of userdata can exceed the maximum |
4033 | * offset value (U8_MAX) for following extensions, therefor it | |
4034 | * must be the last extension added. | |
4035 | */ | |
4036 | ulen = 0; | |
4037 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
4038 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
4039 | if (ulen > 0) | |
4040 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
4041 | ulen); | |
4042 | } | |
4043 | ||
fe2811eb | 4044 | err = -ENOMEM; |
7d740264 | 4045 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 4046 | timeout, GFP_KERNEL); |
fe2811eb PM |
4047 | if (elem.priv == NULL) |
4048 | goto err3; | |
4049 | ||
4050 | ext = nft_set_elem_ext(set, elem.priv); | |
4051 | if (flags) | |
4052 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
4053 | if (ulen > 0) { |
4054 | udata = nft_set_ext_userdata(ext); | |
4055 | udata->len = ulen - 1; | |
4056 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
4057 | } | |
8aeff920 PNA |
4058 | if (obj) { |
4059 | *nft_set_ext_obj(ext) = obj; | |
4060 | obj->use++; | |
4061 | } | |
fe2811eb | 4062 | |
60319eb1 PNA |
4063 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
4064 | if (trans == NULL) | |
fe2811eb | 4065 | goto err4; |
60319eb1 | 4066 | |
69086658 | 4067 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
c016c7e4 PNA |
4068 | err = set->ops->insert(ctx->net, set, &elem, &ext2); |
4069 | if (err) { | |
4070 | if (err == -EEXIST) { | |
9744a6fc PNA |
4071 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ |
4072 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || | |
4073 | nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ | |
b4b8230f CIK |
4074 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) { |
4075 | err = -EBUSY; | |
4076 | goto err5; | |
4077 | } | |
8aeff920 PNA |
4078 | if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
4079 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && | |
4080 | memcmp(nft_set_ext_data(ext), | |
4081 | nft_set_ext_data(ext2), set->dlen) != 0) || | |
4082 | (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && | |
4083 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && | |
4084 | *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) | |
c016c7e4 PNA |
4085 | err = -EBUSY; |
4086 | else if (!(nlmsg_flags & NLM_F_EXCL)) | |
4087 | err = 0; | |
4088 | } | |
fe2811eb | 4089 | goto err5; |
c016c7e4 | 4090 | } |
20a69341 | 4091 | |
35d0ac90 PNA |
4092 | if (set->size && |
4093 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { | |
4094 | err = -ENFILE; | |
4095 | goto err6; | |
4096 | } | |
4097 | ||
60319eb1 | 4098 | nft_trans_elem(trans) = elem; |
46bbafce | 4099 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
4100 | return 0; |
4101 | ||
35d0ac90 | 4102 | err6: |
5cb82a38 | 4103 | set->ops->remove(ctx->net, set, &elem); |
fe2811eb | 4104 | err5: |
60319eb1 | 4105 | kfree(trans); |
fe2811eb PM |
4106 | err4: |
4107 | kfree(elem.priv); | |
20a69341 PM |
4108 | err3: |
4109 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
59105446 | 4110 | nft_data_release(&data, d2.type); |
20a69341 | 4111 | err2: |
59105446 | 4112 | nft_data_release(&elem.key.val, d1.type); |
20a69341 PM |
4113 | err1: |
4114 | return err; | |
4115 | } | |
4116 | ||
633c9a84 PNA |
4117 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
4118 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4119 | const struct nlattr * const nla[], |
4120 | struct netlink_ext_ack *extack) | |
20a69341 | 4121 | { |
f2a6d766 | 4122 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4123 | const struct nlattr *attr; |
4124 | struct nft_set *set; | |
4125 | struct nft_ctx ctx; | |
60319eb1 | 4126 | int rem, err = 0; |
20a69341 | 4127 | |
7d5570ca PNA |
4128 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
4129 | return -EINVAL; | |
4130 | ||
f2a6d766 | 4131 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
4132 | if (err < 0) |
4133 | return err; | |
4134 | ||
37a9cc52 PNA |
4135 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
4136 | genmask); | |
958bee14 PNA |
4137 | if (IS_ERR(set)) { |
4138 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { | |
4139 | set = nf_tables_set_lookup_byid(net, | |
37a9cc52 PNA |
4140 | nla[NFTA_SET_ELEM_LIST_SET_ID], |
4141 | genmask); | |
958bee14 PNA |
4142 | } |
4143 | if (IS_ERR(set)) | |
4144 | return PTR_ERR(set); | |
4145 | } | |
4146 | ||
20a69341 PM |
4147 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
4148 | return -EBUSY; | |
4149 | ||
4150 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
c016c7e4 | 4151 | err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags); |
35d0ac90 | 4152 | if (err < 0) |
60319eb1 | 4153 | break; |
20a69341 | 4154 | } |
60319eb1 | 4155 | return err; |
20a69341 PM |
4156 | } |
4157 | ||
59105446 PNA |
4158 | /** |
4159 | * nft_data_hold - hold a nft_data item | |
4160 | * | |
4161 | * @data: struct nft_data to release | |
4162 | * @type: type of data | |
4163 | * | |
4164 | * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
4165 | * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and | |
4166 | * NFT_GOTO verdicts. This function must be called on active data objects | |
4167 | * from the second phase of the commit protocol. | |
4168 | */ | |
aa06e0ca | 4169 | void nft_data_hold(const struct nft_data *data, enum nft_data_types type) |
59105446 PNA |
4170 | { |
4171 | if (type == NFT_DATA_VERDICT) { | |
4172 | switch (data->verdict.code) { | |
4173 | case NFT_JUMP: | |
4174 | case NFT_GOTO: | |
4175 | data->verdict.chain->use++; | |
4176 | break; | |
4177 | } | |
4178 | } | |
4179 | } | |
4180 | ||
4181 | static void nft_set_elem_activate(const struct net *net, | |
4182 | const struct nft_set *set, | |
4183 | struct nft_set_elem *elem) | |
4184 | { | |
4185 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4186 | ||
4187 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4188 | nft_data_hold(nft_set_ext_data(ext), set->dtype); | |
4189 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4190 | (*nft_set_ext_obj(ext))->use++; | |
4191 | } | |
4192 | ||
4193 | static void nft_set_elem_deactivate(const struct net *net, | |
4194 | const struct nft_set *set, | |
4195 | struct nft_set_elem *elem) | |
4196 | { | |
4197 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4198 | ||
4199 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4200 | nft_data_release(nft_set_ext_data(ext), set->dtype); | |
4201 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4202 | (*nft_set_ext_obj(ext))->use--; | |
4203 | } | |
4204 | ||
60319eb1 | 4205 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
4206 | const struct nlattr *attr) |
4207 | { | |
4208 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3971ca14 | 4209 | struct nft_set_ext_tmpl tmpl; |
20a69341 PM |
4210 | struct nft_data_desc desc; |
4211 | struct nft_set_elem elem; | |
3971ca14 | 4212 | struct nft_set_ext *ext; |
60319eb1 | 4213 | struct nft_trans *trans; |
3971ca14 PNA |
4214 | u32 flags = 0; |
4215 | void *priv; | |
20a69341 PM |
4216 | int err; |
4217 | ||
4218 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 4219 | nft_set_elem_policy, NULL); |
20a69341 PM |
4220 | if (err < 0) |
4221 | goto err1; | |
4222 | ||
4223 | err = -EINVAL; | |
4224 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
4225 | goto err1; | |
4226 | ||
3971ca14 PNA |
4227 | nft_set_ext_prepare(&tmpl); |
4228 | ||
4229 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
4230 | if (err < 0) | |
4231 | return err; | |
4232 | if (flags != 0) | |
4233 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
4234 | ||
7d740264 | 4235 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 4236 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
4237 | if (err < 0) |
4238 | goto err1; | |
4239 | ||
4240 | err = -EINVAL; | |
4241 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
4242 | goto err2; | |
4243 | ||
3971ca14 PNA |
4244 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len); |
4245 | ||
4246 | err = -ENOMEM; | |
4247 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0, | |
4248 | GFP_KERNEL); | |
4249 | if (elem.priv == NULL) | |
4250 | goto err2; | |
4251 | ||
4252 | ext = nft_set_elem_ext(set, elem.priv); | |
4253 | if (flags) | |
4254 | *nft_set_ext_flags(ext) = flags; | |
4255 | ||
60319eb1 | 4256 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
4257 | if (trans == NULL) { |
4258 | err = -ENOMEM; | |
3971ca14 | 4259 | goto err3; |
609ccf08 | 4260 | } |
20a69341 | 4261 | |
42a55769 | 4262 | priv = set->ops->deactivate(ctx->net, set, &elem); |
3971ca14 | 4263 | if (priv == NULL) { |
cc02e457 | 4264 | err = -ENOENT; |
3971ca14 | 4265 | goto err4; |
cc02e457 | 4266 | } |
3971ca14 PNA |
4267 | kfree(elem.priv); |
4268 | elem.priv = priv; | |
cc02e457 | 4269 | |
59105446 PNA |
4270 | nft_set_elem_deactivate(ctx->net, set, &elem); |
4271 | ||
60319eb1 | 4272 | nft_trans_elem(trans) = elem; |
46bbafce | 4273 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 4274 | return 0; |
cc02e457 | 4275 | |
3971ca14 | 4276 | err4: |
cc02e457 | 4277 | kfree(trans); |
3971ca14 PNA |
4278 | err3: |
4279 | kfree(elem.priv); | |
20a69341 | 4280 | err2: |
59105446 | 4281 | nft_data_release(&elem.key.val, desc.type); |
20a69341 PM |
4282 | err1: |
4283 | return err; | |
4284 | } | |
4285 | ||
8411b644 | 4286 | static int nft_flush_set(const struct nft_ctx *ctx, |
de70185d | 4287 | struct nft_set *set, |
8411b644 | 4288 | const struct nft_set_iter *iter, |
de70185d | 4289 | struct nft_set_elem *elem) |
8411b644 PNA |
4290 | { |
4291 | struct nft_trans *trans; | |
4292 | int err; | |
4293 | ||
4294 | trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, | |
4295 | sizeof(struct nft_trans_elem), GFP_ATOMIC); | |
4296 | if (!trans) | |
4297 | return -ENOMEM; | |
4298 | ||
1ba1c414 | 4299 | if (!set->ops->flush(ctx->net, set, elem->priv)) { |
8411b644 PNA |
4300 | err = -ENOENT; |
4301 | goto err1; | |
4302 | } | |
b2c11e4b | 4303 | set->ndeact++; |
8411b644 | 4304 | |
de70185d PNA |
4305 | nft_trans_elem_set(trans) = set; |
4306 | nft_trans_elem(trans) = *elem; | |
8411b644 PNA |
4307 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
4308 | ||
4309 | return 0; | |
4310 | err1: | |
4311 | kfree(trans); | |
4312 | return err; | |
4313 | } | |
4314 | ||
633c9a84 PNA |
4315 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
4316 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4317 | const struct nlattr * const nla[], |
4318 | struct netlink_ext_ack *extack) | |
20a69341 | 4319 | { |
f2a6d766 | 4320 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4321 | const struct nlattr *attr; |
4322 | struct nft_set *set; | |
4323 | struct nft_ctx ctx; | |
60319eb1 | 4324 | int rem, err = 0; |
20a69341 | 4325 | |
f2a6d766 | 4326 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
4327 | if (err < 0) |
4328 | return err; | |
4329 | ||
37a9cc52 PNA |
4330 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
4331 | genmask); | |
20a69341 PM |
4332 | if (IS_ERR(set)) |
4333 | return PTR_ERR(set); | |
4334 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
4335 | return -EBUSY; | |
4336 | ||
8411b644 | 4337 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) { |
baa2d42c PNA |
4338 | struct nft_set_iter iter = { |
4339 | .genmask = genmask, | |
4340 | .fn = nft_flush_set, | |
8411b644 | 4341 | }; |
baa2d42c | 4342 | set->ops->walk(&ctx, set, &iter); |
8411b644 | 4343 | |
baa2d42c | 4344 | return iter.err; |
8411b644 PNA |
4345 | } |
4346 | ||
20a69341 PM |
4347 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
4348 | err = nft_del_setelem(&ctx, set, attr); | |
4349 | if (err < 0) | |
60319eb1 | 4350 | break; |
4fefee57 | 4351 | |
3dd0673a | 4352 | set->ndeact++; |
20a69341 | 4353 | } |
60319eb1 | 4354 | return err; |
20a69341 PM |
4355 | } |
4356 | ||
cfed7e1b PM |
4357 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
4358 | { | |
4359 | struct nft_set_gc_batch *gcb; | |
4360 | unsigned int i; | |
4361 | ||
4362 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
4363 | for (i = 0; i < gcb->head.cnt; i++) | |
61f9e292 | 4364 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); |
cfed7e1b PM |
4365 | kfree(gcb); |
4366 | } | |
4367 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
4368 | ||
4369 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
4370 | gfp_t gfp) | |
4371 | { | |
4372 | struct nft_set_gc_batch *gcb; | |
4373 | ||
4374 | gcb = kzalloc(sizeof(*gcb), gfp); | |
4375 | if (gcb == NULL) | |
4376 | return gcb; | |
4377 | gcb->head.set = set; | |
4378 | return gcb; | |
4379 | } | |
4380 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
4381 | ||
e5009240 PNA |
4382 | /* |
4383 | * Stateful objects | |
4384 | */ | |
4385 | ||
4386 | /** | |
4387 | * nft_register_obj- register nf_tables stateful object type | |
4388 | * @obj: object type | |
4389 | * | |
4390 | * Registers the object type for use with nf_tables. Returns zero on | |
4391 | * success or a negative errno code otherwise. | |
4392 | */ | |
4393 | int nft_register_obj(struct nft_object_type *obj_type) | |
4394 | { | |
4395 | if (obj_type->type == NFT_OBJECT_UNSPEC) | |
4396 | return -EINVAL; | |
4397 | ||
4398 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4399 | list_add_rcu(&obj_type->list, &nf_tables_objects); | |
4400 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4401 | return 0; | |
4402 | } | |
4403 | EXPORT_SYMBOL_GPL(nft_register_obj); | |
4404 | ||
4405 | /** | |
4406 | * nft_unregister_obj - unregister nf_tables object type | |
4407 | * @obj: object type | |
4408 | * | |
4409 | * Unregisters the object type for use with nf_tables. | |
4410 | */ | |
4411 | void nft_unregister_obj(struct nft_object_type *obj_type) | |
4412 | { | |
4413 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4414 | list_del_rcu(&obj_type->list); | |
4415 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4416 | } | |
4417 | EXPORT_SYMBOL_GPL(nft_unregister_obj); | |
4418 | ||
4419 | struct nft_object *nf_tables_obj_lookup(const struct nft_table *table, | |
4420 | const struct nlattr *nla, | |
4421 | u32 objtype, u8 genmask) | |
4422 | { | |
4423 | struct nft_object *obj; | |
4424 | ||
4425 | list_for_each_entry(obj, &table->objects, list) { | |
4426 | if (!nla_strcmp(nla, obj->name) && | |
dfc46034 | 4427 | objtype == obj->ops->type->type && |
e5009240 PNA |
4428 | nft_active_genmask(obj, genmask)) |
4429 | return obj; | |
4430 | } | |
4431 | return ERR_PTR(-ENOENT); | |
4432 | } | |
4433 | EXPORT_SYMBOL_GPL(nf_tables_obj_lookup); | |
4434 | ||
4435 | static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { | |
b2fbd044 LZ |
4436 | [NFTA_OBJ_TABLE] = { .type = NLA_STRING, |
4437 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
4438 | [NFTA_OBJ_NAME] = { .type = NLA_STRING, | |
4439 | .len = NFT_OBJ_MAXNAMELEN - 1 }, | |
e5009240 PNA |
4440 | [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, |
4441 | [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, | |
4442 | }; | |
4443 | ||
84fba055 FW |
4444 | static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, |
4445 | const struct nft_object_type *type, | |
e5009240 PNA |
4446 | const struct nlattr *attr) |
4447 | { | |
4448 | struct nlattr *tb[type->maxattr + 1]; | |
dfc46034 | 4449 | const struct nft_object_ops *ops; |
e5009240 PNA |
4450 | struct nft_object *obj; |
4451 | int err; | |
4452 | ||
4453 | if (attr) { | |
fceb6435 JB |
4454 | err = nla_parse_nested(tb, type->maxattr, attr, type->policy, |
4455 | NULL); | |
e5009240 PNA |
4456 | if (err < 0) |
4457 | goto err1; | |
4458 | } else { | |
4459 | memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); | |
4460 | } | |
4461 | ||
dfc46034 PBG |
4462 | if (type->select_ops) { |
4463 | ops = type->select_ops(ctx, (const struct nlattr * const *)tb); | |
4464 | if (IS_ERR(ops)) { | |
4465 | err = PTR_ERR(ops); | |
4466 | goto err1; | |
4467 | } | |
4468 | } else { | |
4469 | ops = type->ops; | |
4470 | } | |
4471 | ||
e5009240 | 4472 | err = -ENOMEM; |
dfc46034 | 4473 | obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL); |
e5009240 PNA |
4474 | if (obj == NULL) |
4475 | goto err1; | |
4476 | ||
dfc46034 | 4477 | err = ops->init(ctx, (const struct nlattr * const *)tb, obj); |
e5009240 PNA |
4478 | if (err < 0) |
4479 | goto err2; | |
4480 | ||
dfc46034 PBG |
4481 | obj->ops = ops; |
4482 | ||
e5009240 PNA |
4483 | return obj; |
4484 | err2: | |
4485 | kfree(obj); | |
4486 | err1: | |
4487 | return ERR_PTR(err); | |
4488 | } | |
4489 | ||
4490 | static int nft_object_dump(struct sk_buff *skb, unsigned int attr, | |
43da04a5 | 4491 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4492 | { |
4493 | struct nlattr *nest; | |
4494 | ||
4495 | nest = nla_nest_start(skb, attr); | |
4496 | if (!nest) | |
4497 | goto nla_put_failure; | |
dfc46034 | 4498 | if (obj->ops->dump(skb, obj, reset) < 0) |
e5009240 PNA |
4499 | goto nla_put_failure; |
4500 | nla_nest_end(skb, nest); | |
4501 | return 0; | |
4502 | ||
4503 | nla_put_failure: | |
4504 | return -1; | |
4505 | } | |
4506 | ||
4507 | static const struct nft_object_type *__nft_obj_type_get(u32 objtype) | |
4508 | { | |
4509 | const struct nft_object_type *type; | |
4510 | ||
4511 | list_for_each_entry(type, &nf_tables_objects, list) { | |
4512 | if (objtype == type->type) | |
4513 | return type; | |
4514 | } | |
4515 | return NULL; | |
4516 | } | |
4517 | ||
4518 | static const struct nft_object_type *nft_obj_type_get(u32 objtype) | |
4519 | { | |
4520 | const struct nft_object_type *type; | |
4521 | ||
4522 | type = __nft_obj_type_get(objtype); | |
4523 | if (type != NULL && try_module_get(type->owner)) | |
4524 | return type; | |
4525 | ||
4526 | #ifdef CONFIG_MODULES | |
4527 | if (type == NULL) { | |
4528 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4529 | request_module("nft-obj-%u", objtype); | |
4530 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4531 | if (__nft_obj_type_get(objtype)) | |
4532 | return ERR_PTR(-EAGAIN); | |
4533 | } | |
4534 | #endif | |
4535 | return ERR_PTR(-ENOENT); | |
4536 | } | |
4537 | ||
4538 | static int nf_tables_newobj(struct net *net, struct sock *nlsk, | |
4539 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4540 | const struct nlattr * const nla[], |
4541 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4542 | { |
4543 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4544 | const struct nft_object_type *type; | |
4545 | u8 genmask = nft_genmask_next(net); | |
4546 | int family = nfmsg->nfgen_family; | |
4547 | struct nft_af_info *afi; | |
4548 | struct nft_table *table; | |
4549 | struct nft_object *obj; | |
4550 | struct nft_ctx ctx; | |
4551 | u32 objtype; | |
4552 | int err; | |
4553 | ||
4554 | if (!nla[NFTA_OBJ_TYPE] || | |
4555 | !nla[NFTA_OBJ_NAME] || | |
4556 | !nla[NFTA_OBJ_DATA]) | |
4557 | return -EINVAL; | |
4558 | ||
4559 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4560 | if (IS_ERR(afi)) | |
4561 | return PTR_ERR(afi); | |
4562 | ||
4563 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4564 | if (IS_ERR(table)) | |
4565 | return PTR_ERR(table); | |
4566 | ||
4567 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4568 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4569 | if (IS_ERR(obj)) { | |
4570 | err = PTR_ERR(obj); | |
4571 | if (err != -ENOENT) | |
4572 | return err; | |
4573 | ||
1a28ad74 | 4574 | } else { |
e5009240 PNA |
4575 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
4576 | return -EEXIST; | |
4577 | ||
4578 | return 0; | |
4579 | } | |
4580 | ||
4581 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4582 | ||
4583 | type = nft_obj_type_get(objtype); | |
4584 | if (IS_ERR(type)) | |
4585 | return PTR_ERR(type); | |
4586 | ||
84fba055 | 4587 | obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); |
e5009240 PNA |
4588 | if (IS_ERR(obj)) { |
4589 | err = PTR_ERR(obj); | |
4590 | goto err1; | |
4591 | } | |
18965317 | 4592 | obj->table = table; |
61509575 PS |
4593 | obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL); |
4594 | if (!obj->name) { | |
4595 | err = -ENOMEM; | |
4596 | goto err2; | |
4597 | } | |
e5009240 PNA |
4598 | |
4599 | err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); | |
4600 | if (err < 0) | |
61509575 | 4601 | goto err3; |
e5009240 PNA |
4602 | |
4603 | list_add_tail_rcu(&obj->list, &table->objects); | |
4604 | table->use++; | |
4605 | return 0; | |
61509575 PS |
4606 | err3: |
4607 | kfree(obj->name); | |
e5009240 | 4608 | err2: |
dfc46034 PBG |
4609 | if (obj->ops->destroy) |
4610 | obj->ops->destroy(obj); | |
e5009240 PNA |
4611 | kfree(obj); |
4612 | err1: | |
4613 | module_put(type->owner); | |
4614 | return err; | |
4615 | } | |
4616 | ||
4617 | static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, | |
4618 | u32 portid, u32 seq, int event, u32 flags, | |
4619 | int family, const struct nft_table *table, | |
43da04a5 | 4620 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4621 | { |
4622 | struct nfgenmsg *nfmsg; | |
4623 | struct nlmsghdr *nlh; | |
4624 | ||
dedb67c4 | 4625 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
e5009240 PNA |
4626 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
4627 | if (nlh == NULL) | |
4628 | goto nla_put_failure; | |
4629 | ||
4630 | nfmsg = nlmsg_data(nlh); | |
4631 | nfmsg->nfgen_family = family; | |
4632 | nfmsg->version = NFNETLINK_V0; | |
4633 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4634 | ||
4635 | if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || | |
4636 | nla_put_string(skb, NFTA_OBJ_NAME, obj->name) || | |
dfc46034 | 4637 | nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) || |
e5009240 | 4638 | nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || |
43da04a5 | 4639 | nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset)) |
e5009240 PNA |
4640 | goto nla_put_failure; |
4641 | ||
4642 | nlmsg_end(skb, nlh); | |
4643 | return 0; | |
4644 | ||
4645 | nla_put_failure: | |
4646 | nlmsg_trim(skb, nlh); | |
4647 | return -1; | |
4648 | } | |
4649 | ||
a9fea2a3 | 4650 | struct nft_obj_filter { |
e46abbcc | 4651 | char *table; |
a9fea2a3 PNA |
4652 | u32 type; |
4653 | }; | |
4654 | ||
e5009240 PNA |
4655 | static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) |
4656 | { | |
4657 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
4658 | const struct nft_af_info *afi; | |
4659 | const struct nft_table *table; | |
e5009240 | 4660 | unsigned int idx = 0, s_idx = cb->args[0]; |
a9fea2a3 | 4661 | struct nft_obj_filter *filter = cb->data; |
e5009240 PNA |
4662 | struct net *net = sock_net(skb->sk); |
4663 | int family = nfmsg->nfgen_family; | |
43da04a5 PNA |
4664 | struct nft_object *obj; |
4665 | bool reset = false; | |
4666 | ||
4667 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) | |
4668 | reset = true; | |
e5009240 PNA |
4669 | |
4670 | rcu_read_lock(); | |
4671 | cb->seq = net->nft.base_seq; | |
4672 | ||
4673 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
4674 | if (family != NFPROTO_UNSPEC && family != afi->family) | |
4675 | continue; | |
4676 | ||
4677 | list_for_each_entry_rcu(table, &afi->tables, list) { | |
4678 | list_for_each_entry_rcu(obj, &table->objects, list) { | |
4679 | if (!nft_is_active(net, obj)) | |
4680 | goto cont; | |
4681 | if (idx < s_idx) | |
4682 | goto cont; | |
4683 | if (idx > s_idx) | |
4684 | memset(&cb->args[1], 0, | |
4685 | sizeof(cb->args) - sizeof(cb->args[0])); | |
ee084004 | 4686 | if (filter && filter->table && |
a9fea2a3 PNA |
4687 | strcmp(filter->table, table->name)) |
4688 | goto cont; | |
d21e540b LZ |
4689 | if (filter && |
4690 | filter->type != NFT_OBJECT_UNSPEC && | |
dfc46034 | 4691 | obj->ops->type->type != filter->type) |
a9fea2a3 PNA |
4692 | goto cont; |
4693 | ||
e5009240 PNA |
4694 | if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, |
4695 | cb->nlh->nlmsg_seq, | |
4696 | NFT_MSG_NEWOBJ, | |
4697 | NLM_F_MULTI | NLM_F_APPEND, | |
43da04a5 | 4698 | afi->family, table, obj, reset) < 0) |
e5009240 PNA |
4699 | goto done; |
4700 | ||
4701 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
4702 | cont: | |
4703 | idx++; | |
4704 | } | |
4705 | } | |
4706 | } | |
4707 | done: | |
4708 | rcu_read_unlock(); | |
4709 | ||
4710 | cb->args[0] = idx; | |
4711 | return skb->len; | |
4712 | } | |
4713 | ||
a9fea2a3 PNA |
4714 | static int nf_tables_dump_obj_done(struct netlink_callback *cb) |
4715 | { | |
e46abbcc PS |
4716 | struct nft_obj_filter *filter = cb->data; |
4717 | ||
8bea728d HL |
4718 | if (filter) { |
4719 | kfree(filter->table); | |
4720 | kfree(filter); | |
4721 | } | |
a9fea2a3 PNA |
4722 | |
4723 | return 0; | |
4724 | } | |
4725 | ||
4726 | static struct nft_obj_filter * | |
4727 | nft_obj_filter_alloc(const struct nlattr * const nla[]) | |
4728 | { | |
4729 | struct nft_obj_filter *filter; | |
4730 | ||
4731 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); | |
4732 | if (!filter) | |
4733 | return ERR_PTR(-ENOMEM); | |
4734 | ||
e46abbcc PS |
4735 | if (nla[NFTA_OBJ_TABLE]) { |
4736 | filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL); | |
4737 | if (!filter->table) { | |
4738 | kfree(filter); | |
4739 | return ERR_PTR(-ENOMEM); | |
4740 | } | |
4741 | } | |
a9fea2a3 PNA |
4742 | if (nla[NFTA_OBJ_TYPE]) |
4743 | filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4744 | ||
4745 | return filter; | |
4746 | } | |
4747 | ||
e5009240 PNA |
4748 | static int nf_tables_getobj(struct net *net, struct sock *nlsk, |
4749 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4750 | const struct nlattr * const nla[], |
4751 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4752 | { |
4753 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4754 | u8 genmask = nft_genmask_cur(net); | |
4755 | int family = nfmsg->nfgen_family; | |
4756 | const struct nft_af_info *afi; | |
4757 | const struct nft_table *table; | |
4758 | struct nft_object *obj; | |
4759 | struct sk_buff *skb2; | |
43da04a5 | 4760 | bool reset = false; |
e5009240 PNA |
4761 | u32 objtype; |
4762 | int err; | |
4763 | ||
4764 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
4765 | struct netlink_dump_control c = { | |
4766 | .dump = nf_tables_dump_obj, | |
a9fea2a3 | 4767 | .done = nf_tables_dump_obj_done, |
e5009240 | 4768 | }; |
a9fea2a3 PNA |
4769 | |
4770 | if (nla[NFTA_OBJ_TABLE] || | |
4771 | nla[NFTA_OBJ_TYPE]) { | |
4772 | struct nft_obj_filter *filter; | |
4773 | ||
4774 | filter = nft_obj_filter_alloc(nla); | |
4775 | if (IS_ERR(filter)) | |
4776 | return -ENOMEM; | |
4777 | ||
4778 | c.data = filter; | |
4779 | } | |
e5009240 PNA |
4780 | return netlink_dump_start(nlsk, skb, nlh, &c); |
4781 | } | |
4782 | ||
4783 | if (!nla[NFTA_OBJ_NAME] || | |
4784 | !nla[NFTA_OBJ_TYPE]) | |
4785 | return -EINVAL; | |
4786 | ||
4787 | afi = nf_tables_afinfo_lookup(net, family, false); | |
4788 | if (IS_ERR(afi)) | |
4789 | return PTR_ERR(afi); | |
4790 | ||
4791 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4792 | if (IS_ERR(table)) | |
4793 | return PTR_ERR(table); | |
4794 | ||
4795 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4796 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4797 | if (IS_ERR(obj)) | |
4798 | return PTR_ERR(obj); | |
4799 | ||
4800 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4801 | if (!skb2) | |
4802 | return -ENOMEM; | |
4803 | ||
43da04a5 PNA |
4804 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) |
4805 | reset = true; | |
4806 | ||
e5009240 PNA |
4807 | err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, |
4808 | nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, | |
43da04a5 | 4809 | family, table, obj, reset); |
e5009240 PNA |
4810 | if (err < 0) |
4811 | goto err; | |
4812 | ||
4813 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4814 | err: | |
4815 | kfree_skb(skb2); | |
4816 | return err; | |
e5009240 PNA |
4817 | } |
4818 | ||
4819 | static void nft_obj_destroy(struct nft_object *obj) | |
4820 | { | |
dfc46034 PBG |
4821 | if (obj->ops->destroy) |
4822 | obj->ops->destroy(obj); | |
e5009240 | 4823 | |
dfc46034 | 4824 | module_put(obj->ops->type->owner); |
61509575 | 4825 | kfree(obj->name); |
e5009240 PNA |
4826 | kfree(obj); |
4827 | } | |
4828 | ||
4829 | static int nf_tables_delobj(struct net *net, struct sock *nlsk, | |
04ba724b PNA |
4830 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
4831 | const struct nlattr * const nla[], | |
4832 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4833 | { |
4834 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4835 | u8 genmask = nft_genmask_next(net); | |
4836 | int family = nfmsg->nfgen_family; | |
4837 | struct nft_af_info *afi; | |
4838 | struct nft_table *table; | |
4839 | struct nft_object *obj; | |
4840 | struct nft_ctx ctx; | |
4841 | u32 objtype; | |
4842 | ||
4843 | if (!nla[NFTA_OBJ_TYPE] || | |
4844 | !nla[NFTA_OBJ_NAME]) | |
4845 | return -EINVAL; | |
4846 | ||
4847 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4848 | if (IS_ERR(afi)) | |
4849 | return PTR_ERR(afi); | |
4850 | ||
4851 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4852 | if (IS_ERR(table)) | |
4853 | return PTR_ERR(table); | |
4854 | ||
4855 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4856 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4857 | if (IS_ERR(obj)) | |
4858 | return PTR_ERR(obj); | |
4859 | if (obj->use > 0) | |
4860 | return -EBUSY; | |
4861 | ||
4862 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4863 | ||
4864 | return nft_delobj(&ctx, obj); | |
4865 | } | |
4866 | ||
25e94a99 PNA |
4867 | void nft_obj_notify(struct net *net, struct nft_table *table, |
4868 | struct nft_object *obj, u32 portid, u32 seq, int event, | |
4869 | int family, int report, gfp_t gfp) | |
e5009240 PNA |
4870 | { |
4871 | struct sk_buff *skb; | |
4872 | int err; | |
4873 | ||
2599e989 PNA |
4874 | if (!report && |
4875 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 4876 | return; |
e5009240 | 4877 | |
2599e989 | 4878 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp); |
e5009240 PNA |
4879 | if (skb == NULL) |
4880 | goto err; | |
4881 | ||
2599e989 PNA |
4882 | err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family, |
4883 | table, obj, false); | |
e5009240 PNA |
4884 | if (err < 0) { |
4885 | kfree_skb(skb); | |
4886 | goto err; | |
4887 | } | |
4888 | ||
25e94a99 PNA |
4889 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp); |
4890 | return; | |
e5009240 | 4891 | err: |
25e94a99 | 4892 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
e5009240 | 4893 | } |
2599e989 PNA |
4894 | EXPORT_SYMBOL_GPL(nft_obj_notify); |
4895 | ||
25e94a99 PNA |
4896 | static void nf_tables_obj_notify(const struct nft_ctx *ctx, |
4897 | struct nft_object *obj, int event) | |
2599e989 | 4898 | { |
25e94a99 PNA |
4899 | nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, |
4900 | ctx->afi->family, ctx->report, GFP_KERNEL); | |
2599e989 | 4901 | } |
e5009240 | 4902 | |
84d7fce6 PNA |
4903 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
4904 | u32 portid, u32 seq) | |
4905 | { | |
4906 | struct nlmsghdr *nlh; | |
4907 | struct nfgenmsg *nfmsg; | |
784b4e61 | 4908 | char buf[TASK_COMM_LEN]; |
dedb67c4 | 4909 | int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); |
84d7fce6 PNA |
4910 | |
4911 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
4912 | if (nlh == NULL) | |
4913 | goto nla_put_failure; | |
4914 | ||
4915 | nfmsg = nlmsg_data(nlh); | |
4916 | nfmsg->nfgen_family = AF_UNSPEC; | |
4917 | nfmsg->version = NFNETLINK_V0; | |
4918 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4919 | ||
784b4e61 PS |
4920 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) || |
4921 | nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) || | |
4922 | nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current))) | |
84d7fce6 PNA |
4923 | goto nla_put_failure; |
4924 | ||
053c095a JB |
4925 | nlmsg_end(skb, nlh); |
4926 | return 0; | |
84d7fce6 PNA |
4927 | |
4928 | nla_put_failure: | |
4929 | nlmsg_trim(skb, nlh); | |
4930 | return -EMSGSIZE; | |
4931 | } | |
4932 | ||
25e94a99 PNA |
4933 | static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, |
4934 | int event) | |
84d7fce6 PNA |
4935 | { |
4936 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
4937 | struct sk_buff *skb2; | |
4938 | int err; | |
4939 | ||
4940 | if (nlmsg_report(nlh) && | |
4941 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 4942 | return; |
84d7fce6 | 4943 | |
84d7fce6 PNA |
4944 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
4945 | if (skb2 == NULL) | |
4946 | goto err; | |
4947 | ||
4948 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
4949 | nlh->nlmsg_seq); | |
4950 | if (err < 0) { | |
4951 | kfree_skb(skb2); | |
4952 | goto err; | |
4953 | } | |
4954 | ||
25e94a99 PNA |
4955 | nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
4956 | nlmsg_report(nlh), GFP_KERNEL); | |
4957 | return; | |
84d7fce6 | 4958 | err: |
25e94a99 PNA |
4959 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
4960 | -ENOBUFS); | |
84d7fce6 PNA |
4961 | } |
4962 | ||
7b8002a1 PNA |
4963 | static int nf_tables_getgen(struct net *net, struct sock *nlsk, |
4964 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4965 | const struct nlattr * const nla[], |
4966 | struct netlink_ext_ack *extack) | |
84d7fce6 | 4967 | { |
84d7fce6 PNA |
4968 | struct sk_buff *skb2; |
4969 | int err; | |
4970 | ||
4971 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4972 | if (skb2 == NULL) | |
4973 | return -ENOMEM; | |
4974 | ||
4975 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
4976 | nlh->nlmsg_seq); | |
4977 | if (err < 0) | |
4978 | goto err; | |
4979 | ||
4980 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4981 | err: | |
4982 | kfree_skb(skb2); | |
4983 | return err; | |
4984 | } | |
4985 | ||
96518518 PM |
4986 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
4987 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 4988 | .call_batch = nf_tables_newtable, |
96518518 PM |
4989 | .attr_count = NFTA_TABLE_MAX, |
4990 | .policy = nft_table_policy, | |
4991 | }, | |
4992 | [NFT_MSG_GETTABLE] = { | |
4993 | .call = nf_tables_gettable, | |
4994 | .attr_count = NFTA_TABLE_MAX, | |
4995 | .policy = nft_table_policy, | |
4996 | }, | |
4997 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 4998 | .call_batch = nf_tables_deltable, |
96518518 PM |
4999 | .attr_count = NFTA_TABLE_MAX, |
5000 | .policy = nft_table_policy, | |
5001 | }, | |
5002 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 5003 | .call_batch = nf_tables_newchain, |
96518518 PM |
5004 | .attr_count = NFTA_CHAIN_MAX, |
5005 | .policy = nft_chain_policy, | |
5006 | }, | |
5007 | [NFT_MSG_GETCHAIN] = { | |
5008 | .call = nf_tables_getchain, | |
5009 | .attr_count = NFTA_CHAIN_MAX, | |
5010 | .policy = nft_chain_policy, | |
5011 | }, | |
5012 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 5013 | .call_batch = nf_tables_delchain, |
96518518 PM |
5014 | .attr_count = NFTA_CHAIN_MAX, |
5015 | .policy = nft_chain_policy, | |
5016 | }, | |
5017 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 5018 | .call_batch = nf_tables_newrule, |
96518518 PM |
5019 | .attr_count = NFTA_RULE_MAX, |
5020 | .policy = nft_rule_policy, | |
5021 | }, | |
5022 | [NFT_MSG_GETRULE] = { | |
5023 | .call = nf_tables_getrule, | |
5024 | .attr_count = NFTA_RULE_MAX, | |
5025 | .policy = nft_rule_policy, | |
5026 | }, | |
5027 | [NFT_MSG_DELRULE] = { | |
0628b123 | 5028 | .call_batch = nf_tables_delrule, |
96518518 PM |
5029 | .attr_count = NFTA_RULE_MAX, |
5030 | .policy = nft_rule_policy, | |
5031 | }, | |
20a69341 | 5032 | [NFT_MSG_NEWSET] = { |
958bee14 | 5033 | .call_batch = nf_tables_newset, |
20a69341 PM |
5034 | .attr_count = NFTA_SET_MAX, |
5035 | .policy = nft_set_policy, | |
5036 | }, | |
5037 | [NFT_MSG_GETSET] = { | |
5038 | .call = nf_tables_getset, | |
5039 | .attr_count = NFTA_SET_MAX, | |
5040 | .policy = nft_set_policy, | |
5041 | }, | |
5042 | [NFT_MSG_DELSET] = { | |
958bee14 | 5043 | .call_batch = nf_tables_delset, |
20a69341 PM |
5044 | .attr_count = NFTA_SET_MAX, |
5045 | .policy = nft_set_policy, | |
5046 | }, | |
5047 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 5048 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
5049 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
5050 | .policy = nft_set_elem_list_policy, | |
5051 | }, | |
5052 | [NFT_MSG_GETSETELEM] = { | |
5053 | .call = nf_tables_getsetelem, | |
5054 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
5055 | .policy = nft_set_elem_list_policy, | |
5056 | }, | |
5057 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 5058 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
5059 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
5060 | .policy = nft_set_elem_list_policy, | |
5061 | }, | |
84d7fce6 PNA |
5062 | [NFT_MSG_GETGEN] = { |
5063 | .call = nf_tables_getgen, | |
5064 | }, | |
e5009240 PNA |
5065 | [NFT_MSG_NEWOBJ] = { |
5066 | .call_batch = nf_tables_newobj, | |
5067 | .attr_count = NFTA_OBJ_MAX, | |
5068 | .policy = nft_obj_policy, | |
5069 | }, | |
5070 | [NFT_MSG_GETOBJ] = { | |
5071 | .call = nf_tables_getobj, | |
5072 | .attr_count = NFTA_OBJ_MAX, | |
5073 | .policy = nft_obj_policy, | |
5074 | }, | |
5075 | [NFT_MSG_DELOBJ] = { | |
5076 | .call_batch = nf_tables_delobj, | |
5077 | .attr_count = NFTA_OBJ_MAX, | |
5078 | .policy = nft_obj_policy, | |
5079 | }, | |
43da04a5 PNA |
5080 | [NFT_MSG_GETOBJ_RESET] = { |
5081 | .call = nf_tables_getobj, | |
5082 | .attr_count = NFTA_OBJ_MAX, | |
5083 | .policy = nft_obj_policy, | |
5084 | }, | |
96518518 PM |
5085 | }; |
5086 | ||
91c7b38d PNA |
5087 | static void nft_chain_commit_update(struct nft_trans *trans) |
5088 | { | |
5089 | struct nft_base_chain *basechain; | |
5090 | ||
b7263e07 | 5091 | if (nft_trans_chain_name(trans)) |
ebcd5ea1 | 5092 | swap(trans->ctx.chain->name, nft_trans_chain_name(trans)); |
91c7b38d | 5093 | |
f323d954 | 5094 | if (!nft_is_base_chain(trans->ctx.chain)) |
91c7b38d PNA |
5095 | return; |
5096 | ||
5097 | basechain = nft_base_chain(trans->ctx.chain); | |
5098 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
5099 | ||
5100 | switch (nft_trans_chain_policy(trans)) { | |
5101 | case NF_DROP: | |
5102 | case NF_ACCEPT: | |
5103 | basechain->policy = nft_trans_chain_policy(trans); | |
5104 | break; | |
5105 | } | |
5106 | } | |
5107 | ||
b326dd37 | 5108 | static void nf_tables_commit_release(struct nft_trans *trans) |
c7c32e72 | 5109 | { |
c7c32e72 PNA |
5110 | switch (trans->msg_type) { |
5111 | case NFT_MSG_DELTABLE: | |
5112 | nf_tables_table_destroy(&trans->ctx); | |
5113 | break; | |
5114 | case NFT_MSG_DELCHAIN: | |
5115 | nf_tables_chain_destroy(trans->ctx.chain); | |
5116 | break; | |
5117 | case NFT_MSG_DELRULE: | |
5118 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
5119 | break; | |
5120 | case NFT_MSG_DELSET: | |
5121 | nft_set_destroy(nft_trans_set(trans)); | |
5122 | break; | |
61edafbb | 5123 | case NFT_MSG_DELSETELEM: |
59105446 PNA |
5124 | nf_tables_set_elem_destroy(nft_trans_elem_set(trans), |
5125 | nft_trans_elem(trans).priv); | |
61edafbb | 5126 | break; |
e5009240 PNA |
5127 | case NFT_MSG_DELOBJ: |
5128 | nft_obj_destroy(nft_trans_obj(trans)); | |
5129 | break; | |
c7c32e72 PNA |
5130 | } |
5131 | kfree(trans); | |
5132 | } | |
5133 | ||
5913beaf | 5134 | static int nf_tables_commit(struct net *net, struct sk_buff *skb) |
37082f93 | 5135 | { |
37082f93 | 5136 | struct nft_trans *trans, *next; |
a3716e70 | 5137 | struct nft_trans_elem *te; |
37082f93 PNA |
5138 | |
5139 | /* Bump generation counter, invalidate any dump in progress */ | |
38e029f1 | 5140 | while (++net->nft.base_seq == 0); |
37082f93 PNA |
5141 | |
5142 | /* A new generation has just started */ | |
ea4bd995 | 5143 | net->nft.gencursor = nft_gencursor_next(net); |
37082f93 PNA |
5144 | |
5145 | /* Make sure all packets have left the previous generation before | |
5146 | * purging old rules. | |
5147 | */ | |
5148 | synchronize_rcu(); | |
5149 | ||
5150 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 5151 | switch (trans->msg_type) { |
55dd6f93 PNA |
5152 | case NFT_MSG_NEWTABLE: |
5153 | if (nft_trans_table_update(trans)) { | |
5154 | if (!nft_trans_table_enable(trans)) { | |
664b0f8c PNA |
5155 | nf_tables_table_disable(net, |
5156 | trans->ctx.afi, | |
55dd6f93 PNA |
5157 | trans->ctx.table); |
5158 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
5159 | } | |
5160 | } else { | |
f2a6d766 | 5161 | nft_clear(net, trans->ctx.table); |
55dd6f93 | 5162 | } |
35151d84 | 5163 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
5164 | nft_trans_destroy(trans); |
5165 | break; | |
5166 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 5167 | list_del_rcu(&trans->ctx.table->list); |
35151d84 | 5168 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 5169 | break; |
91c7b38d PNA |
5170 | case NFT_MSG_NEWCHAIN: |
5171 | if (nft_trans_chain_update(trans)) | |
5172 | nft_chain_commit_update(trans); | |
4fefee57 | 5173 | else |
664b0f8c | 5174 | nft_clear(net, trans->ctx.chain); |
4fefee57 | 5175 | |
35151d84 | 5176 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
5177 | nft_trans_destroy(trans); |
5178 | break; | |
5179 | case NFT_MSG_DELCHAIN: | |
664b0f8c | 5180 | list_del_rcu(&trans->ctx.chain->list); |
35151d84 | 5181 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
82bec71d PNA |
5182 | nf_tables_unregister_hooks(trans->ctx.net, |
5183 | trans->ctx.table, | |
c5598794 AB |
5184 | trans->ctx.chain, |
5185 | trans->ctx.afi->nops); | |
91c7b38d | 5186 | break; |
b380e5c7 | 5187 | case NFT_MSG_NEWRULE: |
889f7ee7 | 5188 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
35151d84 | 5189 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 5190 | nft_trans_rule(trans), |
35151d84 | 5191 | NFT_MSG_NEWRULE); |
37082f93 | 5192 | nft_trans_destroy(trans); |
b380e5c7 PNA |
5193 | break; |
5194 | case NFT_MSG_DELRULE: | |
5195 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
5196 | nf_tables_rule_notify(&trans->ctx, |
5197 | nft_trans_rule(trans), | |
5198 | NFT_MSG_DELRULE); | |
b380e5c7 | 5199 | break; |
958bee14 | 5200 | case NFT_MSG_NEWSET: |
37a9cc52 | 5201 | nft_clear(net, nft_trans_set(trans)); |
4fefee57 PNA |
5202 | /* This avoids hitting -EBUSY when deleting the table |
5203 | * from the transaction. | |
5204 | */ | |
5205 | if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS && | |
5206 | !list_empty(&nft_trans_set(trans)->bindings)) | |
5207 | trans->ctx.table->use--; | |
5208 | ||
958bee14 | 5209 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 5210 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
5211 | nft_trans_destroy(trans); |
5212 | break; | |
5213 | case NFT_MSG_DELSET: | |
37a9cc52 | 5214 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 | 5215 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 5216 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 5217 | break; |
60319eb1 | 5218 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
5219 | te = (struct nft_trans_elem *)trans->data; |
5220 | ||
42a55769 | 5221 | te->set->ops->activate(net, te->set, &te->elem); |
cc02e457 PM |
5222 | nf_tables_setelem_notify(&trans->ctx, te->set, |
5223 | &te->elem, | |
60319eb1 PNA |
5224 | NFT_MSG_NEWSETELEM, 0); |
5225 | nft_trans_destroy(trans); | |
5226 | break; | |
5227 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 5228 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 5229 | |
a3716e70 PNA |
5230 | nf_tables_setelem_notify(&trans->ctx, te->set, |
5231 | &te->elem, | |
60319eb1 | 5232 | NFT_MSG_DELSETELEM, 0); |
5cb82a38 | 5233 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a PM |
5234 | atomic_dec(&te->set->nelems); |
5235 | te->set->ndeact--; | |
60319eb1 | 5236 | break; |
e5009240 PNA |
5237 | case NFT_MSG_NEWOBJ: |
5238 | nft_clear(net, nft_trans_obj(trans)); | |
5239 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
5240 | NFT_MSG_NEWOBJ); | |
5241 | nft_trans_destroy(trans); | |
5242 | break; | |
5243 | case NFT_MSG_DELOBJ: | |
5244 | list_del_rcu(&nft_trans_obj(trans)->list); | |
5245 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
5246 | NFT_MSG_DELOBJ); | |
5247 | break; | |
37082f93 | 5248 | } |
37082f93 PNA |
5249 | } |
5250 | ||
b326dd37 PNA |
5251 | synchronize_rcu(); |
5252 | ||
37082f93 | 5253 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 | 5254 | list_del(&trans->list); |
b326dd37 | 5255 | nf_tables_commit_release(trans); |
37082f93 | 5256 | } |
84d7fce6 PNA |
5257 | |
5258 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); | |
37082f93 PNA |
5259 | |
5260 | return 0; | |
5261 | } | |
5262 | ||
b326dd37 | 5263 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 5264 | { |
c7c32e72 PNA |
5265 | switch (trans->msg_type) { |
5266 | case NFT_MSG_NEWTABLE: | |
5267 | nf_tables_table_destroy(&trans->ctx); | |
5268 | break; | |
5269 | case NFT_MSG_NEWCHAIN: | |
5270 | nf_tables_chain_destroy(trans->ctx.chain); | |
5271 | break; | |
5272 | case NFT_MSG_NEWRULE: | |
5273 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
5274 | break; | |
5275 | case NFT_MSG_NEWSET: | |
5276 | nft_set_destroy(nft_trans_set(trans)); | |
5277 | break; | |
61edafbb PM |
5278 | case NFT_MSG_NEWSETELEM: |
5279 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 5280 | nft_trans_elem(trans).priv, true); |
61edafbb | 5281 | break; |
e5009240 PNA |
5282 | case NFT_MSG_NEWOBJ: |
5283 | nft_obj_destroy(nft_trans_obj(trans)); | |
5284 | break; | |
c7c32e72 PNA |
5285 | } |
5286 | kfree(trans); | |
5287 | } | |
5288 | ||
5913beaf | 5289 | static int nf_tables_abort(struct net *net, struct sk_buff *skb) |
37082f93 | 5290 | { |
37082f93 | 5291 | struct nft_trans *trans, *next; |
02263db0 | 5292 | struct nft_trans_elem *te; |
37082f93 | 5293 | |
a907e36d XL |
5294 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
5295 | list) { | |
b380e5c7 | 5296 | switch (trans->msg_type) { |
55dd6f93 PNA |
5297 | case NFT_MSG_NEWTABLE: |
5298 | if (nft_trans_table_update(trans)) { | |
5299 | if (nft_trans_table_enable(trans)) { | |
664b0f8c PNA |
5300 | nf_tables_table_disable(net, |
5301 | trans->ctx.afi, | |
55dd6f93 PNA |
5302 | trans->ctx.table); |
5303 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
5304 | } | |
5305 | nft_trans_destroy(trans); | |
5306 | } else { | |
e688a7f8 | 5307 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
5308 | } |
5309 | break; | |
5310 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 5311 | nft_clear(trans->ctx.net, trans->ctx.table); |
55dd6f93 PNA |
5312 | nft_trans_destroy(trans); |
5313 | break; | |
91c7b38d PNA |
5314 | case NFT_MSG_NEWCHAIN: |
5315 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 5316 | free_percpu(nft_trans_chain_stats(trans)); |
91c7b38d PNA |
5317 | |
5318 | nft_trans_destroy(trans); | |
5319 | } else { | |
4fefee57 | 5320 | trans->ctx.table->use--; |
e688a7f8 | 5321 | list_del_rcu(&trans->ctx.chain->list); |
82bec71d PNA |
5322 | nf_tables_unregister_hooks(trans->ctx.net, |
5323 | trans->ctx.table, | |
c5598794 AB |
5324 | trans->ctx.chain, |
5325 | trans->ctx.afi->nops); | |
91c7b38d PNA |
5326 | } |
5327 | break; | |
5328 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 5329 | trans->ctx.table->use++; |
664b0f8c | 5330 | nft_clear(trans->ctx.net, trans->ctx.chain); |
91c7b38d PNA |
5331 | nft_trans_destroy(trans); |
5332 | break; | |
b380e5c7 | 5333 | case NFT_MSG_NEWRULE: |
4fefee57 | 5334 | trans->ctx.chain->use--; |
b380e5c7 | 5335 | list_del_rcu(&nft_trans_rule(trans)->list); |
aa06e0ca | 5336 | nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans)); |
b380e5c7 PNA |
5337 | break; |
5338 | case NFT_MSG_DELRULE: | |
4fefee57 | 5339 | trans->ctx.chain->use++; |
889f7ee7 | 5340 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
aa06e0ca | 5341 | nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans)); |
37082f93 | 5342 | nft_trans_destroy(trans); |
b380e5c7 | 5343 | break; |
958bee14 | 5344 | case NFT_MSG_NEWSET: |
4fefee57 | 5345 | trans->ctx.table->use--; |
e688a7f8 | 5346 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
5347 | break; |
5348 | case NFT_MSG_DELSET: | |
4fefee57 | 5349 | trans->ctx.table->use++; |
37a9cc52 | 5350 | nft_clear(trans->ctx.net, nft_trans_set(trans)); |
958bee14 PNA |
5351 | nft_trans_destroy(trans); |
5352 | break; | |
60319eb1 | 5353 | case NFT_MSG_NEWSETELEM: |
02263db0 | 5354 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 5355 | |
5cb82a38 | 5356 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a | 5357 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
5358 | break; |
5359 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
5360 | te = (struct nft_trans_elem *)trans->data; |
5361 | ||
59105446 | 5362 | nft_set_elem_activate(net, te->set, &te->elem); |
42a55769 | 5363 | te->set->ops->activate(net, te->set, &te->elem); |
3dd0673a | 5364 | te->set->ndeact--; |
cc02e457 | 5365 | |
e5009240 PNA |
5366 | nft_trans_destroy(trans); |
5367 | break; | |
5368 | case NFT_MSG_NEWOBJ: | |
5369 | trans->ctx.table->use--; | |
5370 | list_del_rcu(&nft_trans_obj(trans)->list); | |
5371 | break; | |
5372 | case NFT_MSG_DELOBJ: | |
5373 | trans->ctx.table->use++; | |
5374 | nft_clear(trans->ctx.net, nft_trans_obj(trans)); | |
60319eb1 PNA |
5375 | nft_trans_destroy(trans); |
5376 | break; | |
37082f93 | 5377 | } |
37082f93 PNA |
5378 | } |
5379 | ||
b326dd37 PNA |
5380 | synchronize_rcu(); |
5381 | ||
a1cee076 PNA |
5382 | list_for_each_entry_safe_reverse(trans, next, |
5383 | &net->nft.commit_list, list) { | |
c7c32e72 | 5384 | list_del(&trans->list); |
b326dd37 | 5385 | nf_tables_abort_release(trans); |
37082f93 PNA |
5386 | } |
5387 | ||
5388 | return 0; | |
5389 | } | |
5390 | ||
74e8bcd2 PNA |
5391 | static bool nf_tables_valid_genid(struct net *net, u32 genid) |
5392 | { | |
5393 | return net->nft.base_seq == genid; | |
5394 | } | |
5395 | ||
96518518 PM |
5396 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
5397 | .name = "nf_tables", | |
5398 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
5399 | .cb_count = NFT_MSG_MAX, | |
5400 | .cb = nf_tables_cb, | |
0628b123 PNA |
5401 | .commit = nf_tables_commit, |
5402 | .abort = nf_tables_abort, | |
74e8bcd2 | 5403 | .valid_genid = nf_tables_valid_genid, |
96518518 PM |
5404 | }; |
5405 | ||
7210e4e3 PNA |
5406 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
5407 | enum nft_chain_type type) | |
5408 | { | |
5409 | const struct nft_base_chain *basechain; | |
5410 | ||
f323d954 | 5411 | if (nft_is_base_chain(chain)) { |
7210e4e3 PNA |
5412 | basechain = nft_base_chain(chain); |
5413 | if (basechain->type->type != type) | |
5414 | return -EOPNOTSUPP; | |
5415 | } | |
5416 | return 0; | |
5417 | } | |
5418 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
5419 | ||
75e8d06d PNA |
5420 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
5421 | unsigned int hook_flags) | |
5422 | { | |
5423 | struct nft_base_chain *basechain; | |
5424 | ||
f323d954 | 5425 | if (nft_is_base_chain(chain)) { |
75e8d06d PNA |
5426 | basechain = nft_base_chain(chain); |
5427 | ||
5428 | if ((1 << basechain->ops[0].hooknum) & hook_flags) | |
5429 | return 0; | |
5430 | ||
5431 | return -EOPNOTSUPP; | |
5432 | } | |
5433 | ||
5434 | return 0; | |
5435 | } | |
5436 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
5437 | ||
20a69341 PM |
5438 | /* |
5439 | * Loop detection - walk through the ruleset beginning at the destination chain | |
5440 | * of a new jump until either the source chain is reached (loop) or all | |
5441 | * reachable chains have been traversed. | |
5442 | * | |
5443 | * The loop check is performed whenever a new jump verdict is added to an | |
5444 | * expression or verdict map or a verdict map is bound to a new chain. | |
5445 | */ | |
5446 | ||
5447 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
5448 | const struct nft_chain *chain); | |
5449 | ||
5450 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 5451 | struct nft_set *set, |
20a69341 | 5452 | const struct nft_set_iter *iter, |
de70185d | 5453 | struct nft_set_elem *elem) |
20a69341 | 5454 | { |
fe2811eb PM |
5455 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
5456 | const struct nft_data *data; | |
5457 | ||
5458 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
5459 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
5460 | return 0; |
5461 | ||
fe2811eb | 5462 | data = nft_set_ext_data(ext); |
1ca2e170 | 5463 | switch (data->verdict.code) { |
20a69341 PM |
5464 | case NFT_JUMP: |
5465 | case NFT_GOTO: | |
1ca2e170 | 5466 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
5467 | default: |
5468 | return 0; | |
5469 | } | |
5470 | } | |
5471 | ||
5472 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
5473 | const struct nft_chain *chain) | |
5474 | { | |
5475 | const struct nft_rule *rule; | |
5476 | const struct nft_expr *expr, *last; | |
de70185d | 5477 | struct nft_set *set; |
20a69341 PM |
5478 | struct nft_set_binding *binding; |
5479 | struct nft_set_iter iter; | |
20a69341 PM |
5480 | |
5481 | if (ctx->chain == chain) | |
5482 | return -ELOOP; | |
5483 | ||
5484 | list_for_each_entry(rule, &chain->rules, list) { | |
5485 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
5486 | const struct nft_data *data = NULL; |
5487 | int err; | |
5488 | ||
5489 | if (!expr->ops->validate) | |
20a69341 PM |
5490 | continue; |
5491 | ||
0ca743a5 PNA |
5492 | err = expr->ops->validate(ctx, expr, &data); |
5493 | if (err < 0) | |
5494 | return err; | |
5495 | ||
20a69341 | 5496 | if (data == NULL) |
0ca743a5 | 5497 | continue; |
20a69341 | 5498 | |
1ca2e170 | 5499 | switch (data->verdict.code) { |
20a69341 PM |
5500 | case NFT_JUMP: |
5501 | case NFT_GOTO: | |
1ca2e170 PM |
5502 | err = nf_tables_check_loops(ctx, |
5503 | data->verdict.chain); | |
20a69341 PM |
5504 | if (err < 0) |
5505 | return err; | |
5506 | default: | |
5507 | break; | |
5508 | } | |
5509 | } | |
5510 | } | |
5511 | ||
5512 | list_for_each_entry(set, &ctx->table->sets, list) { | |
37a9cc52 PNA |
5513 | if (!nft_is_active_next(ctx->net, set)) |
5514 | continue; | |
20a69341 PM |
5515 | if (!(set->flags & NFT_SET_MAP) || |
5516 | set->dtype != NFT_DATA_VERDICT) | |
5517 | continue; | |
5518 | ||
5519 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
5520 | if (!(binding->flags & NFT_SET_MAP) || |
5521 | binding->chain != chain) | |
20a69341 PM |
5522 | continue; |
5523 | ||
8588ac09 | 5524 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
5525 | iter.skip = 0; |
5526 | iter.count = 0; | |
5527 | iter.err = 0; | |
5528 | iter.fn = nf_tables_loop_check_setelem; | |
5529 | ||
5530 | set->ops->walk(ctx, set, &iter); | |
5531 | if (iter.err < 0) | |
5532 | return iter.err; | |
5533 | } | |
5534 | } | |
5535 | ||
5536 | return 0; | |
5537 | } | |
5538 | ||
36b701fa LGL |
5539 | /** |
5540 | * nft_parse_u32_check - fetch u32 attribute and check for maximum value | |
5541 | * | |
5542 | * @attr: netlink attribute to fetch value from | |
5543 | * @max: maximum value to be stored in dest | |
5544 | * @dest: pointer to the variable | |
5545 | * | |
5546 | * Parse, check and store a given u32 netlink attribute into variable. | |
5547 | * This function returns -ERANGE if the value goes over maximum value. | |
5548 | * Otherwise a 0 is returned and the attribute value is stored in the | |
5549 | * destination variable. | |
5550 | */ | |
f1d505bb | 5551 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) |
36b701fa | 5552 | { |
09525a09 | 5553 | u32 val; |
36b701fa LGL |
5554 | |
5555 | val = ntohl(nla_get_be32(attr)); | |
5556 | if (val > max) | |
5557 | return -ERANGE; | |
5558 | ||
5559 | *dest = val; | |
5560 | return 0; | |
5561 | } | |
5562 | EXPORT_SYMBOL_GPL(nft_parse_u32_check); | |
5563 | ||
49499c3e PM |
5564 | /** |
5565 | * nft_parse_register - parse a register value from a netlink attribute | |
5566 | * | |
5567 | * @attr: netlink attribute | |
5568 | * | |
5569 | * Parse and translate a register value from a netlink attribute. | |
5570 | * Registers used to be 128 bit wide, these register numbers will be | |
5571 | * mapped to the corresponding 32 bit register numbers. | |
5572 | */ | |
b1c96ed3 PM |
5573 | unsigned int nft_parse_register(const struct nlattr *attr) |
5574 | { | |
49499c3e PM |
5575 | unsigned int reg; |
5576 | ||
5577 | reg = ntohl(nla_get_be32(attr)); | |
5578 | switch (reg) { | |
5579 | case NFT_REG_VERDICT...NFT_REG_4: | |
5580 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
5581 | default: | |
5582 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
5583 | } | |
b1c96ed3 PM |
5584 | } |
5585 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
5586 | ||
49499c3e PM |
5587 | /** |
5588 | * nft_dump_register - dump a register value to a netlink attribute | |
5589 | * | |
5590 | * @skb: socket buffer | |
5591 | * @attr: attribute number | |
5592 | * @reg: register number | |
5593 | * | |
5594 | * Construct a netlink attribute containing the register number. For | |
5595 | * compatibility reasons, register numbers being a multiple of 4 are | |
5596 | * translated to the corresponding 128 bit register numbers. | |
5597 | */ | |
b1c96ed3 PM |
5598 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
5599 | { | |
49499c3e PM |
5600 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
5601 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
5602 | else | |
5603 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
5604 | ||
b1c96ed3 PM |
5605 | return nla_put_be32(skb, attr, htonl(reg)); |
5606 | } | |
5607 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
5608 | ||
96518518 | 5609 | /** |
d07db988 | 5610 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
5611 | * |
5612 | * @reg: the register number | |
d07db988 | 5613 | * @len: the length of the data |
96518518 PM |
5614 | * |
5615 | * Validate that the input register is one of the general purpose | |
d07db988 | 5616 | * registers and that the length of the load is within the bounds. |
96518518 | 5617 | */ |
d07db988 | 5618 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 5619 | { |
49499c3e | 5620 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 5621 | return -EINVAL; |
d07db988 PM |
5622 | if (len == 0) |
5623 | return -EINVAL; | |
49499c3e | 5624 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 5625 | return -ERANGE; |
49499c3e | 5626 | |
96518518 PM |
5627 | return 0; |
5628 | } | |
d07db988 | 5629 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 5630 | |
96518518 | 5631 | /** |
1ec10212 | 5632 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
5633 | * |
5634 | * @ctx: context of the expression performing the load | |
5635 | * @reg: the destination register number | |
5636 | * @data: the data to load | |
5637 | * @type: the data type | |
45d9bcda | 5638 | * @len: the length of the data |
96518518 PM |
5639 | * |
5640 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
5641 | * the destination register and the length is within the bounds. |
5642 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 5643 | * data. |
96518518 | 5644 | */ |
1ec10212 PM |
5645 | int nft_validate_register_store(const struct nft_ctx *ctx, |
5646 | enum nft_registers reg, | |
5647 | const struct nft_data *data, | |
5648 | enum nft_data_types type, unsigned int len) | |
96518518 | 5649 | { |
20a69341 PM |
5650 | int err; |
5651 | ||
96518518 PM |
5652 | switch (reg) { |
5653 | case NFT_REG_VERDICT: | |
58f40ab6 | 5654 | if (type != NFT_DATA_VERDICT) |
96518518 | 5655 | return -EINVAL; |
20a69341 | 5656 | |
58f40ab6 | 5657 | if (data != NULL && |
1ca2e170 PM |
5658 | (data->verdict.code == NFT_GOTO || |
5659 | data->verdict.code == NFT_JUMP)) { | |
5660 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
5661 | if (err < 0) |
5662 | return err; | |
5663 | ||
1ca2e170 PM |
5664 | if (ctx->chain->level + 1 > |
5665 | data->verdict.chain->level) { | |
20a69341 PM |
5666 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
5667 | return -EMLINK; | |
1ca2e170 | 5668 | data->verdict.chain->level = ctx->chain->level + 1; |
20a69341 PM |
5669 | } |
5670 | } | |
5671 | ||
96518518 PM |
5672 | return 0; |
5673 | default: | |
49499c3e | 5674 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 5675 | return -EINVAL; |
45d9bcda PM |
5676 | if (len == 0) |
5677 | return -EINVAL; | |
49499c3e PM |
5678 | if (reg * NFT_REG32_SIZE + len > |
5679 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 5680 | return -ERANGE; |
27e6d201 | 5681 | |
96518518 PM |
5682 | if (data != NULL && type != NFT_DATA_VALUE) |
5683 | return -EINVAL; | |
5684 | return 0; | |
5685 | } | |
5686 | } | |
1ec10212 | 5687 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
5688 | |
5689 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
5690 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
5691 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
5692 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
5693 | }; | |
5694 | ||
5695 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
5696 | struct nft_data_desc *desc, const struct nlattr *nla) | |
5697 | { | |
664b0f8c | 5698 | u8 genmask = nft_genmask_next(ctx->net); |
96518518 PM |
5699 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
5700 | struct nft_chain *chain; | |
5701 | int err; | |
5702 | ||
fceb6435 JB |
5703 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy, |
5704 | NULL); | |
96518518 PM |
5705 | if (err < 0) |
5706 | return err; | |
5707 | ||
5708 | if (!tb[NFTA_VERDICT_CODE]) | |
5709 | return -EINVAL; | |
1ca2e170 | 5710 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 5711 | |
1ca2e170 | 5712 | switch (data->verdict.code) { |
e0abdadc | 5713 | default: |
1ca2e170 | 5714 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
5715 | case NF_ACCEPT: |
5716 | case NF_DROP: | |
5717 | case NF_QUEUE: | |
5718 | break; | |
5719 | default: | |
5720 | return -EINVAL; | |
5721 | } | |
5722 | /* fall through */ | |
96518518 PM |
5723 | case NFT_CONTINUE: |
5724 | case NFT_BREAK: | |
5725 | case NFT_RETURN: | |
96518518 PM |
5726 | break; |
5727 | case NFT_JUMP: | |
5728 | case NFT_GOTO: | |
5729 | if (!tb[NFTA_VERDICT_CHAIN]) | |
5730 | return -EINVAL; | |
5731 | chain = nf_tables_chain_lookup(ctx->table, | |
664b0f8c | 5732 | tb[NFTA_VERDICT_CHAIN], genmask); |
96518518 PM |
5733 | if (IS_ERR(chain)) |
5734 | return PTR_ERR(chain); | |
f323d954 | 5735 | if (nft_is_base_chain(chain)) |
96518518 PM |
5736 | return -EOPNOTSUPP; |
5737 | ||
96518518 | 5738 | chain->use++; |
1ca2e170 | 5739 | data->verdict.chain = chain; |
96518518 | 5740 | break; |
96518518 PM |
5741 | } |
5742 | ||
4c4ed074 | 5743 | desc->len = sizeof(data->verdict); |
96518518 PM |
5744 | desc->type = NFT_DATA_VERDICT; |
5745 | return 0; | |
5746 | } | |
5747 | ||
5748 | static void nft_verdict_uninit(const struct nft_data *data) | |
5749 | { | |
1ca2e170 | 5750 | switch (data->verdict.code) { |
96518518 PM |
5751 | case NFT_JUMP: |
5752 | case NFT_GOTO: | |
1ca2e170 | 5753 | data->verdict.chain->use--; |
96518518 PM |
5754 | break; |
5755 | } | |
5756 | } | |
5757 | ||
33d5a7b1 | 5758 | int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) |
96518518 PM |
5759 | { |
5760 | struct nlattr *nest; | |
5761 | ||
33d5a7b1 | 5762 | nest = nla_nest_start(skb, type); |
96518518 PM |
5763 | if (!nest) |
5764 | goto nla_put_failure; | |
5765 | ||
33d5a7b1 | 5766 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) |
96518518 PM |
5767 | goto nla_put_failure; |
5768 | ||
33d5a7b1 | 5769 | switch (v->code) { |
96518518 PM |
5770 | case NFT_JUMP: |
5771 | case NFT_GOTO: | |
1ca2e170 | 5772 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
33d5a7b1 | 5773 | v->chain->name)) |
96518518 PM |
5774 | goto nla_put_failure; |
5775 | } | |
5776 | nla_nest_end(skb, nest); | |
5777 | return 0; | |
5778 | ||
5779 | nla_put_failure: | |
5780 | return -1; | |
5781 | } | |
5782 | ||
d0a11fc3 PM |
5783 | static int nft_value_init(const struct nft_ctx *ctx, |
5784 | struct nft_data *data, unsigned int size, | |
96518518 PM |
5785 | struct nft_data_desc *desc, const struct nlattr *nla) |
5786 | { | |
5787 | unsigned int len; | |
5788 | ||
5789 | len = nla_len(nla); | |
5790 | if (len == 0) | |
5791 | return -EINVAL; | |
d0a11fc3 | 5792 | if (len > size) |
96518518 PM |
5793 | return -EOVERFLOW; |
5794 | ||
d0a11fc3 | 5795 | nla_memcpy(data->data, nla, len); |
96518518 PM |
5796 | desc->type = NFT_DATA_VALUE; |
5797 | desc->len = len; | |
5798 | return 0; | |
5799 | } | |
5800 | ||
5801 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
5802 | unsigned int len) | |
5803 | { | |
5804 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
5805 | } | |
5806 | ||
5807 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 5808 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
5809 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
5810 | }; | |
5811 | ||
5812 | /** | |
5813 | * nft_data_init - parse nf_tables data netlink attributes | |
5814 | * | |
5815 | * @ctx: context of the expression using the data | |
5816 | * @data: destination struct nft_data | |
d0a11fc3 | 5817 | * @size: maximum data length |
96518518 PM |
5818 | * @desc: data description |
5819 | * @nla: netlink attribute containing data | |
5820 | * | |
5821 | * Parse the netlink data attributes and initialize a struct nft_data. | |
5822 | * The type and length of data are returned in the data description. | |
5823 | * | |
5824 | * The caller can indicate that it only wants to accept data of type | |
5825 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
5826 | */ | |
d0a11fc3 PM |
5827 | int nft_data_init(const struct nft_ctx *ctx, |
5828 | struct nft_data *data, unsigned int size, | |
96518518 PM |
5829 | struct nft_data_desc *desc, const struct nlattr *nla) |
5830 | { | |
5831 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
5832 | int err; | |
5833 | ||
fceb6435 | 5834 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL); |
96518518 PM |
5835 | if (err < 0) |
5836 | return err; | |
5837 | ||
5838 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
5839 | return nft_value_init(ctx, data, size, desc, |
5840 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
5841 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
5842 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
5843 | return -EINVAL; | |
5844 | } | |
5845 | EXPORT_SYMBOL_GPL(nft_data_init); | |
5846 | ||
5847 | /** | |
59105446 | 5848 | * nft_data_release - release a nft_data item |
96518518 PM |
5849 | * |
5850 | * @data: struct nft_data to release | |
5851 | * @type: type of data | |
5852 | * | |
5853 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
5854 | * all others need to be released by calling this function. | |
5855 | */ | |
59105446 | 5856 | void nft_data_release(const struct nft_data *data, enum nft_data_types type) |
96518518 | 5857 | { |
960bd2c2 | 5858 | if (type < NFT_DATA_VERDICT) |
96518518 | 5859 | return; |
960bd2c2 | 5860 | switch (type) { |
96518518 PM |
5861 | case NFT_DATA_VERDICT: |
5862 | return nft_verdict_uninit(data); | |
5863 | default: | |
5864 | WARN_ON(1); | |
5865 | } | |
5866 | } | |
59105446 | 5867 | EXPORT_SYMBOL_GPL(nft_data_release); |
96518518 PM |
5868 | |
5869 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
5870 | enum nft_data_types type, unsigned int len) | |
5871 | { | |
5872 | struct nlattr *nest; | |
5873 | int err; | |
5874 | ||
5875 | nest = nla_nest_start(skb, attr); | |
5876 | if (nest == NULL) | |
5877 | return -1; | |
5878 | ||
5879 | switch (type) { | |
5880 | case NFT_DATA_VALUE: | |
5881 | err = nft_value_dump(skb, data, len); | |
5882 | break; | |
5883 | case NFT_DATA_VERDICT: | |
33d5a7b1 | 5884 | err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); |
96518518 PM |
5885 | break; |
5886 | default: | |
5887 | err = -EINVAL; | |
5888 | WARN_ON(1); | |
5889 | } | |
5890 | ||
5891 | nla_nest_end(skb, nest); | |
5892 | return err; | |
5893 | } | |
5894 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
5895 | ||
df05ef87 | 5896 | static int __net_init nf_tables_init_net(struct net *net) |
99633ab2 PNA |
5897 | { |
5898 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 5899 | INIT_LIST_HEAD(&net->nft.commit_list); |
38e029f1 | 5900 | net->nft.base_seq = 1; |
99633ab2 PNA |
5901 | return 0; |
5902 | } | |
5903 | ||
613d0776 VA |
5904 | static void __net_exit nf_tables_exit_net(struct net *net) |
5905 | { | |
5906 | WARN_ON_ONCE(!list_empty(&net->nft.af_info)); | |
5907 | WARN_ON_ONCE(!list_empty(&net->nft.commit_list)); | |
5908 | } | |
5909 | ||
5ebe0b0e PNA |
5910 | int __nft_release_basechain(struct nft_ctx *ctx) |
5911 | { | |
5912 | struct nft_rule *rule, *nr; | |
5913 | ||
f323d954 | 5914 | BUG_ON(!nft_is_base_chain(ctx->chain)); |
5ebe0b0e | 5915 | |
82bec71d | 5916 | nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain, |
5ebe0b0e PNA |
5917 | ctx->afi->nops); |
5918 | list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { | |
5919 | list_del(&rule->list); | |
5920 | ctx->chain->use--; | |
aa06e0ca | 5921 | nf_tables_rule_release(ctx, rule); |
5ebe0b0e PNA |
5922 | } |
5923 | list_del(&ctx->chain->list); | |
5924 | ctx->table->use--; | |
5925 | nf_tables_chain_destroy(ctx->chain); | |
5926 | ||
5927 | return 0; | |
5928 | } | |
5929 | EXPORT_SYMBOL_GPL(__nft_release_basechain); | |
5930 | ||
df05ef87 PNA |
5931 | /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */ |
5932 | static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi) | |
5933 | { | |
5934 | struct nft_table *table, *nt; | |
5935 | struct nft_chain *chain, *nc; | |
e5009240 | 5936 | struct nft_object *obj, *ne; |
df05ef87 PNA |
5937 | struct nft_rule *rule, *nr; |
5938 | struct nft_set *set, *ns; | |
5939 | struct nft_ctx ctx = { | |
5940 | .net = net, | |
5941 | .afi = afi, | |
5942 | }; | |
5943 | ||
5944 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
5945 | list_for_each_entry(chain, &table->chains, list) | |
82bec71d PNA |
5946 | nf_tables_unregister_hooks(net, table, chain, |
5947 | afi->nops); | |
df05ef87 PNA |
5948 | /* No packets are walking on these chains anymore. */ |
5949 | ctx.table = table; | |
5950 | list_for_each_entry(chain, &table->chains, list) { | |
5951 | ctx.chain = chain; | |
5952 | list_for_each_entry_safe(rule, nr, &chain->rules, list) { | |
5953 | list_del(&rule->list); | |
5954 | chain->use--; | |
aa06e0ca | 5955 | nf_tables_rule_release(&ctx, rule); |
df05ef87 PNA |
5956 | } |
5957 | } | |
5958 | list_for_each_entry_safe(set, ns, &table->sets, list) { | |
5959 | list_del(&set->list); | |
5960 | table->use--; | |
5961 | nft_set_destroy(set); | |
5962 | } | |
e5009240 PNA |
5963 | list_for_each_entry_safe(obj, ne, &table->objects, list) { |
5964 | list_del(&obj->list); | |
5965 | table->use--; | |
5966 | nft_obj_destroy(obj); | |
5967 | } | |
df05ef87 PNA |
5968 | list_for_each_entry_safe(chain, nc, &table->chains, list) { |
5969 | list_del(&chain->list); | |
5970 | table->use--; | |
5971 | nf_tables_chain_destroy(chain); | |
5972 | } | |
5973 | list_del(&table->list); | |
5974 | nf_tables_table_destroy(&ctx); | |
5975 | } | |
5976 | } | |
5977 | ||
99633ab2 PNA |
5978 | static struct pernet_operations nf_tables_net_ops = { |
5979 | .init = nf_tables_init_net, | |
613d0776 | 5980 | .exit = nf_tables_exit_net, |
99633ab2 PNA |
5981 | }; |
5982 | ||
96518518 PM |
5983 | static int __init nf_tables_module_init(void) |
5984 | { | |
5985 | int err; | |
5986 | ||
5987 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
5988 | GFP_KERNEL); | |
5989 | if (info == NULL) { | |
5990 | err = -ENOMEM; | |
5991 | goto err1; | |
5992 | } | |
5993 | ||
5994 | err = nf_tables_core_module_init(); | |
5995 | if (err < 0) | |
5996 | goto err2; | |
5997 | ||
5998 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
5999 | if (err < 0) | |
6000 | goto err3; | |
6001 | ||
6002 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 6003 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
6004 | err3: |
6005 | nf_tables_core_module_exit(); | |
6006 | err2: | |
6007 | kfree(info); | |
6008 | err1: | |
6009 | return err; | |
6010 | } | |
6011 | ||
6012 | static void __exit nf_tables_module_exit(void) | |
6013 | { | |
99633ab2 | 6014 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 | 6015 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
1b1bc49c | 6016 | rcu_barrier(); |
96518518 PM |
6017 | nf_tables_core_module_exit(); |
6018 | kfree(info); | |
6019 | } | |
6020 | ||
6021 | module_init(nf_tables_module_init); | |
6022 | module_exit(nf_tables_module_exit); | |
6023 | ||
6024 | MODULE_LICENSE("GPL"); | |
6025 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
6026 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |