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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> | |
3b49e2e9 | 20 | #include <net/netfilter/nf_flow_table.h> |
96518518 PM |
21 | #include <net/netfilter/nf_tables_core.h> |
22 | #include <net/netfilter/nf_tables.h> | |
99633ab2 | 23 | #include <net/net_namespace.h> |
96518518 PM |
24 | #include <net/sock.h> |
25 | ||
96518518 | 26 | static LIST_HEAD(nf_tables_expressions); |
e5009240 | 27 | static LIST_HEAD(nf_tables_objects); |
3b49e2e9 | 28 | static LIST_HEAD(nf_tables_flowtables); |
96518518 PM |
29 | |
30 | /** | |
31 | * nft_register_afinfo - register nf_tables address family info | |
32 | * | |
33 | * @afi: address family info to register | |
34 | * | |
35 | * Register the address family for use with nf_tables. Returns zero on | |
36 | * success or a negative errno code otherwise. | |
37 | */ | |
99633ab2 | 38 | int nft_register_afinfo(struct net *net, struct nft_af_info *afi) |
96518518 PM |
39 | { |
40 | INIT_LIST_HEAD(&afi->tables); | |
41 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 42 | list_add_tail_rcu(&afi->list, &net->nft.af_info); |
96518518 PM |
43 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
44 | return 0; | |
45 | } | |
46 | EXPORT_SYMBOL_GPL(nft_register_afinfo); | |
47 | ||
df05ef87 PNA |
48 | static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi); |
49 | ||
96518518 PM |
50 | /** |
51 | * nft_unregister_afinfo - unregister nf_tables address family info | |
52 | * | |
53 | * @afi: address family info to unregister | |
54 | * | |
55 | * Unregister the address family for use with nf_tables. | |
56 | */ | |
df05ef87 | 57 | void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi) |
96518518 PM |
58 | { |
59 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
df05ef87 | 60 | __nft_release_afinfo(net, afi); |
e688a7f8 | 61 | list_del_rcu(&afi->list); |
96518518 PM |
62 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
63 | } | |
64 | EXPORT_SYMBOL_GPL(nft_unregister_afinfo); | |
65 | ||
99633ab2 | 66 | static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family) |
96518518 PM |
67 | { |
68 | struct nft_af_info *afi; | |
69 | ||
99633ab2 | 70 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
71 | if (afi->family == family) |
72 | return afi; | |
73 | } | |
74 | return NULL; | |
75 | } | |
76 | ||
99633ab2 PNA |
77 | static struct nft_af_info * |
78 | nf_tables_afinfo_lookup(struct net *net, int family, bool autoload) | |
96518518 PM |
79 | { |
80 | struct nft_af_info *afi; | |
81 | ||
99633ab2 | 82 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
83 | if (afi != NULL) |
84 | return afi; | |
85 | #ifdef CONFIG_MODULES | |
86 | if (autoload) { | |
87 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
88 | request_module("nft-afinfo-%u", family); | |
89 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
99633ab2 | 90 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
91 | if (afi != NULL) |
92 | return ERR_PTR(-EAGAIN); | |
93 | } | |
94 | #endif | |
95 | return ERR_PTR(-EAFNOSUPPORT); | |
96 | } | |
97 | ||
7c95f6d8 | 98 | static void nft_ctx_init(struct nft_ctx *ctx, |
633c9a84 | 99 | struct net *net, |
7c95f6d8 PNA |
100 | const struct sk_buff *skb, |
101 | const struct nlmsghdr *nlh, | |
102 | struct nft_af_info *afi, | |
103 | struct nft_table *table, | |
104 | struct nft_chain *chain, | |
105 | const struct nlattr * const *nla) | |
106 | { | |
633c9a84 | 107 | ctx->net = net; |
128ad332 PNA |
108 | ctx->afi = afi; |
109 | ctx->table = table; | |
110 | ctx->chain = chain; | |
111 | ctx->nla = nla; | |
112 | ctx->portid = NETLINK_CB(skb).portid; | |
113 | ctx->report = nlmsg_report(nlh); | |
114 | ctx->seq = nlh->nlmsg_seq; | |
7c95f6d8 PNA |
115 | } |
116 | ||
8411b644 PNA |
117 | static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx, |
118 | int msg_type, u32 size, gfp_t gfp) | |
1081d11b PNA |
119 | { |
120 | struct nft_trans *trans; | |
121 | ||
8411b644 | 122 | trans = kzalloc(sizeof(struct nft_trans) + size, gfp); |
1081d11b PNA |
123 | if (trans == NULL) |
124 | return NULL; | |
125 | ||
b380e5c7 | 126 | trans->msg_type = msg_type; |
1081d11b PNA |
127 | trans->ctx = *ctx; |
128 | ||
129 | return trans; | |
130 | } | |
131 | ||
8411b644 PNA |
132 | static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx, |
133 | int msg_type, u32 size) | |
134 | { | |
135 | return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL); | |
136 | } | |
137 | ||
1081d11b PNA |
138 | static void nft_trans_destroy(struct nft_trans *trans) |
139 | { | |
140 | list_del(&trans->list); | |
141 | kfree(trans); | |
142 | } | |
143 | ||
c974a3a3 PNA |
144 | static int nf_tables_register_hook(struct net *net, |
145 | const struct nft_table *table, | |
146 | struct nft_chain *chain) | |
d8ee8f7c PNA |
147 | { |
148 | if (table->flags & NFT_TABLE_F_DORMANT || | |
f323d954 | 149 | !nft_is_base_chain(chain)) |
d8ee8f7c PNA |
150 | return 0; |
151 | ||
c974a3a3 | 152 | return nf_register_net_hook(net, &nft_base_chain(chain)->ops); |
d8ee8f7c PNA |
153 | } |
154 | ||
c974a3a3 PNA |
155 | static void nf_tables_unregister_hook(struct net *net, |
156 | const struct nft_table *table, | |
157 | struct nft_chain *chain) | |
c5598794 | 158 | { |
d8ee8f7c | 159 | if (table->flags & NFT_TABLE_F_DORMANT || |
f323d954 | 160 | !nft_is_base_chain(chain)) |
d8ee8f7c PNA |
161 | return; |
162 | ||
c974a3a3 | 163 | nf_unregister_net_hook(net, &nft_base_chain(chain)->ops); |
c5598794 AB |
164 | } |
165 | ||
ee01d542 AB |
166 | static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) |
167 | { | |
168 | struct nft_trans *trans; | |
169 | ||
170 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); | |
171 | if (trans == NULL) | |
172 | return -ENOMEM; | |
173 | ||
174 | if (msg_type == NFT_MSG_NEWTABLE) | |
f2a6d766 | 175 | nft_activate_next(ctx->net, ctx->table); |
ee01d542 AB |
176 | |
177 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int nft_deltable(struct nft_ctx *ctx) | |
182 | { | |
183 | int err; | |
184 | ||
185 | err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); | |
186 | if (err < 0) | |
187 | return err; | |
188 | ||
f2a6d766 | 189 | nft_deactivate_next(ctx->net, ctx->table); |
ee01d542 AB |
190 | return err; |
191 | } | |
192 | ||
193 | static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) | |
194 | { | |
195 | struct nft_trans *trans; | |
196 | ||
197 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); | |
198 | if (trans == NULL) | |
199 | return -ENOMEM; | |
200 | ||
201 | if (msg_type == NFT_MSG_NEWCHAIN) | |
664b0f8c | 202 | nft_activate_next(ctx->net, ctx->chain); |
ee01d542 AB |
203 | |
204 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static int nft_delchain(struct nft_ctx *ctx) | |
209 | { | |
210 | int err; | |
211 | ||
212 | err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); | |
213 | if (err < 0) | |
214 | return err; | |
215 | ||
216 | ctx->table->use--; | |
664b0f8c | 217 | nft_deactivate_next(ctx->net, ctx->chain); |
ee01d542 AB |
218 | |
219 | return err; | |
220 | } | |
221 | ||
ee01d542 AB |
222 | static int |
223 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) | |
224 | { | |
225 | /* You cannot delete the same rule twice */ | |
889f7ee7 PNA |
226 | if (nft_is_active_next(ctx->net, rule)) { |
227 | nft_deactivate_next(ctx->net, rule); | |
ee01d542 AB |
228 | ctx->chain->use--; |
229 | return 0; | |
230 | } | |
231 | return -ENOENT; | |
232 | } | |
233 | ||
234 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, | |
235 | struct nft_rule *rule) | |
236 | { | |
237 | struct nft_trans *trans; | |
238 | ||
239 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); | |
240 | if (trans == NULL) | |
241 | return NULL; | |
242 | ||
1a94e38d PNA |
243 | if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) { |
244 | nft_trans_rule_id(trans) = | |
245 | ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID])); | |
246 | } | |
ee01d542 AB |
247 | nft_trans_rule(trans) = rule; |
248 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
249 | ||
250 | return trans; | |
251 | } | |
252 | ||
253 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) | |
254 | { | |
255 | struct nft_trans *trans; | |
256 | int err; | |
257 | ||
258 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); | |
259 | if (trans == NULL) | |
260 | return -ENOMEM; | |
261 | ||
262 | err = nf_tables_delrule_deactivate(ctx, rule); | |
263 | if (err < 0) { | |
264 | nft_trans_destroy(trans); | |
265 | return err; | |
266 | } | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | static int nft_delrule_by_chain(struct nft_ctx *ctx) | |
272 | { | |
273 | struct nft_rule *rule; | |
274 | int err; | |
275 | ||
276 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
277 | err = nft_delrule(ctx, rule); | |
278 | if (err < 0) | |
279 | return err; | |
280 | } | |
281 | return 0; | |
282 | } | |
283 | ||
ee01d542 AB |
284 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, |
285 | struct nft_set *set) | |
286 | { | |
287 | struct nft_trans *trans; | |
288 | ||
289 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); | |
290 | if (trans == NULL) | |
291 | return -ENOMEM; | |
292 | ||
293 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { | |
294 | nft_trans_set_id(trans) = | |
295 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); | |
37a9cc52 | 296 | nft_activate_next(ctx->net, set); |
ee01d542 AB |
297 | } |
298 | nft_trans_set(trans) = set; | |
299 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static int nft_delset(struct nft_ctx *ctx, struct nft_set *set) | |
305 | { | |
306 | int err; | |
307 | ||
308 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); | |
309 | if (err < 0) | |
310 | return err; | |
311 | ||
37a9cc52 | 312 | nft_deactivate_next(ctx->net, set); |
ee01d542 AB |
313 | ctx->table->use--; |
314 | ||
315 | return err; | |
316 | } | |
317 | ||
e5009240 PNA |
318 | static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type, |
319 | struct nft_object *obj) | |
320 | { | |
321 | struct nft_trans *trans; | |
322 | ||
323 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj)); | |
324 | if (trans == NULL) | |
325 | return -ENOMEM; | |
326 | ||
327 | if (msg_type == NFT_MSG_NEWOBJ) | |
328 | nft_activate_next(ctx->net, obj); | |
329 | ||
330 | nft_trans_obj(trans) = obj; | |
331 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj) | |
337 | { | |
338 | int err; | |
339 | ||
340 | err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj); | |
341 | if (err < 0) | |
342 | return err; | |
343 | ||
344 | nft_deactivate_next(ctx->net, obj); | |
345 | ctx->table->use--; | |
346 | ||
347 | return err; | |
348 | } | |
349 | ||
3b49e2e9 PNA |
350 | static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type, |
351 | struct nft_flowtable *flowtable) | |
352 | { | |
353 | struct nft_trans *trans; | |
354 | ||
355 | trans = nft_trans_alloc(ctx, msg_type, | |
356 | sizeof(struct nft_trans_flowtable)); | |
357 | if (trans == NULL) | |
358 | return -ENOMEM; | |
359 | ||
360 | if (msg_type == NFT_MSG_NEWFLOWTABLE) | |
361 | nft_activate_next(ctx->net, flowtable); | |
362 | ||
363 | nft_trans_flowtable(trans) = flowtable; | |
364 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | static int nft_delflowtable(struct nft_ctx *ctx, | |
370 | struct nft_flowtable *flowtable) | |
371 | { | |
372 | int err; | |
373 | ||
374 | err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable); | |
375 | if (err < 0) | |
376 | return err; | |
377 | ||
378 | nft_deactivate_next(ctx->net, flowtable); | |
379 | ctx->table->use--; | |
380 | ||
381 | return err; | |
382 | } | |
383 | ||
96518518 PM |
384 | /* |
385 | * Tables | |
386 | */ | |
387 | ||
388 | static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, | |
f2a6d766 PNA |
389 | const struct nlattr *nla, |
390 | u8 genmask) | |
96518518 PM |
391 | { |
392 | struct nft_table *table; | |
393 | ||
394 | list_for_each_entry(table, &afi->tables, list) { | |
f2a6d766 PNA |
395 | if (!nla_strcmp(nla, table->name) && |
396 | nft_active_genmask(table, genmask)) | |
96518518 PM |
397 | return table; |
398 | } | |
399 | return NULL; | |
400 | } | |
401 | ||
402 | static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, | |
f2a6d766 PNA |
403 | const struct nlattr *nla, |
404 | u8 genmask) | |
96518518 PM |
405 | { |
406 | struct nft_table *table; | |
407 | ||
408 | if (nla == NULL) | |
409 | return ERR_PTR(-EINVAL); | |
410 | ||
f2a6d766 | 411 | table = nft_table_lookup(afi, nla, genmask); |
96518518 PM |
412 | if (table != NULL) |
413 | return table; | |
414 | ||
96518518 PM |
415 | return ERR_PTR(-ENOENT); |
416 | } | |
417 | ||
418 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) | |
419 | { | |
420 | return ++table->hgenerator; | |
421 | } | |
422 | ||
d8297d4f | 423 | static const struct nf_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX]; |
9370761c | 424 | |
2a37d755 | 425 | static const struct nf_chain_type * |
baae3e62 | 426 | __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
9370761c PNA |
427 | { |
428 | int i; | |
429 | ||
baae3e62 | 430 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
431 | if (chain_type[family][i] != NULL && |
432 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 433 | return chain_type[family][i]; |
9370761c | 434 | } |
baae3e62 | 435 | return NULL; |
9370761c PNA |
436 | } |
437 | ||
2a37d755 | 438 | static const struct nf_chain_type * |
baae3e62 PM |
439 | nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
440 | const struct nlattr *nla, | |
441 | bool autoload) | |
9370761c | 442 | { |
2a37d755 | 443 | const struct nf_chain_type *type; |
9370761c PNA |
444 | |
445 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
446 | if (type != NULL) |
447 | return type; | |
9370761c | 448 | #ifdef CONFIG_MODULES |
93b0806f | 449 | if (autoload) { |
9370761c | 450 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2fec6bb6 PNA |
451 | request_module("nft-chain-%u-%.*s", afi->family, |
452 | nla_len(nla), (const char *)nla_data(nla)); | |
9370761c PNA |
453 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
454 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
455 | if (type != NULL) |
456 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
457 | } |
458 | #endif | |
93b0806f | 459 | return ERR_PTR(-ENOENT); |
9370761c PNA |
460 | } |
461 | ||
96518518 | 462 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
1cae565e PNA |
463 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
464 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
9ddf6323 | 465 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
466 | }; |
467 | ||
84d7fce6 PNA |
468 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
469 | u32 portid, u32 seq, int event, u32 flags, | |
470 | int family, const struct nft_table *table) | |
96518518 PM |
471 | { |
472 | struct nlmsghdr *nlh; | |
473 | struct nfgenmsg *nfmsg; | |
474 | ||
dedb67c4 | 475 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
476 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
477 | if (nlh == NULL) | |
478 | goto nla_put_failure; | |
479 | ||
480 | nfmsg = nlmsg_data(nlh); | |
481 | nfmsg->nfgen_family = family; | |
482 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 483 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 | 484 | |
9ddf6323 | 485 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 TB |
486 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
487 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) | |
96518518 PM |
488 | goto nla_put_failure; |
489 | ||
053c095a JB |
490 | nlmsg_end(skb, nlh); |
491 | return 0; | |
96518518 PM |
492 | |
493 | nla_put_failure: | |
494 | nlmsg_trim(skb, nlh); | |
495 | return -1; | |
496 | } | |
497 | ||
25e94a99 | 498 | static void nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
499 | { |
500 | struct sk_buff *skb; | |
96518518 PM |
501 | int err; |
502 | ||
128ad332 PNA |
503 | if (!ctx->report && |
504 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 505 | return; |
96518518 | 506 | |
96518518 PM |
507 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
508 | if (skb == NULL) | |
509 | goto err; | |
510 | ||
84d7fce6 PNA |
511 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
512 | event, 0, ctx->afi->family, ctx->table); | |
96518518 PM |
513 | if (err < 0) { |
514 | kfree_skb(skb); | |
515 | goto err; | |
516 | } | |
517 | ||
25e94a99 PNA |
518 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
519 | ctx->report, GFP_KERNEL); | |
520 | return; | |
96518518 | 521 | err: |
25e94a99 | 522 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
523 | } |
524 | ||
525 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
526 | struct netlink_callback *cb) | |
527 | { | |
528 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
529 | const struct nft_af_info *afi; | |
530 | const struct nft_table *table; | |
531 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 532 | struct net *net = sock_net(skb->sk); |
96518518 PM |
533 | int family = nfmsg->nfgen_family; |
534 | ||
e688a7f8 | 535 | rcu_read_lock(); |
38e029f1 PNA |
536 | cb->seq = net->nft.base_seq; |
537 | ||
e688a7f8 | 538 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
539 | if (family != NFPROTO_UNSPEC && family != afi->family) |
540 | continue; | |
541 | ||
e688a7f8 | 542 | list_for_each_entry_rcu(table, &afi->tables, list) { |
96518518 PM |
543 | if (idx < s_idx) |
544 | goto cont; | |
545 | if (idx > s_idx) | |
546 | memset(&cb->args[1], 0, | |
547 | sizeof(cb->args) - sizeof(cb->args[0])); | |
f2a6d766 PNA |
548 | if (!nft_is_active(net, table)) |
549 | continue; | |
84d7fce6 | 550 | if (nf_tables_fill_table_info(skb, net, |
96518518 PM |
551 | NETLINK_CB(cb->skb).portid, |
552 | cb->nlh->nlmsg_seq, | |
553 | NFT_MSG_NEWTABLE, | |
554 | NLM_F_MULTI, | |
555 | afi->family, table) < 0) | |
556 | goto done; | |
38e029f1 PNA |
557 | |
558 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
559 | cont: |
560 | idx++; | |
561 | } | |
562 | } | |
563 | done: | |
e688a7f8 | 564 | rcu_read_unlock(); |
96518518 PM |
565 | cb->args[0] = idx; |
566 | return skb->len; | |
567 | } | |
568 | ||
7b8002a1 PNA |
569 | static int nf_tables_gettable(struct net *net, struct sock *nlsk, |
570 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
571 | const struct nlattr * const nla[], |
572 | struct netlink_ext_ack *extack) | |
96518518 PM |
573 | { |
574 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 575 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
576 | const struct nft_af_info *afi; |
577 | const struct nft_table *table; | |
578 | struct sk_buff *skb2; | |
579 | int family = nfmsg->nfgen_family; | |
580 | int err; | |
581 | ||
582 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
583 | struct netlink_dump_control c = { | |
584 | .dump = nf_tables_dump_tables, | |
585 | }; | |
586 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
587 | } | |
588 | ||
99633ab2 | 589 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
590 | if (IS_ERR(afi)) |
591 | return PTR_ERR(afi); | |
592 | ||
f2a6d766 | 593 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
594 | if (IS_ERR(table)) |
595 | return PTR_ERR(table); | |
596 | ||
597 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
598 | if (!skb2) | |
599 | return -ENOMEM; | |
600 | ||
84d7fce6 | 601 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
602 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
603 | family, table); | |
604 | if (err < 0) | |
605 | goto err; | |
606 | ||
607 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
608 | ||
609 | err: | |
610 | kfree_skb(skb2); | |
611 | return err; | |
612 | } | |
613 | ||
c9c17211 | 614 | static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt) |
10435c11 F |
615 | { |
616 | struct nft_chain *chain; | |
617 | u32 i = 0; | |
618 | ||
619 | list_for_each_entry(chain, &table->chains, list) { | |
620 | if (!nft_is_active_next(net, chain)) | |
621 | continue; | |
f323d954 | 622 | if (!nft_is_base_chain(chain)) |
10435c11 F |
623 | continue; |
624 | ||
625 | if (cnt && i++ == cnt) | |
626 | break; | |
627 | ||
c974a3a3 | 628 | nf_unregister_net_hook(net, &nft_base_chain(chain)->ops); |
10435c11 F |
629 | } |
630 | } | |
631 | ||
c9c17211 | 632 | static int nf_tables_table_enable(struct net *net, struct nft_table *table) |
9ddf6323 PNA |
633 | { |
634 | struct nft_chain *chain; | |
635 | int err, i = 0; | |
636 | ||
637 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
638 | if (!nft_is_active_next(net, chain)) |
639 | continue; | |
f323d954 | 640 | if (!nft_is_base_chain(chain)) |
d2012975 PNA |
641 | continue; |
642 | ||
c974a3a3 | 643 | err = nf_register_net_hook(net, &nft_base_chain(chain)->ops); |
9ddf6323 PNA |
644 | if (err < 0) |
645 | goto err; | |
646 | ||
647 | i++; | |
648 | } | |
649 | return 0; | |
650 | err: | |
10435c11 | 651 | if (i) |
c9c17211 | 652 | nft_table_disable(net, table, i); |
9ddf6323 PNA |
653 | return err; |
654 | } | |
655 | ||
c9c17211 | 656 | static void nf_tables_table_disable(struct net *net, struct nft_table *table) |
9ddf6323 | 657 | { |
c9c17211 | 658 | nft_table_disable(net, table, 0); |
9ddf6323 PNA |
659 | } |
660 | ||
e1aaca93 | 661 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 662 | { |
55dd6f93 | 663 | struct nft_trans *trans; |
e1aaca93 | 664 | u32 flags; |
55dd6f93 | 665 | int ret = 0; |
9ddf6323 | 666 | |
e1aaca93 PNA |
667 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
668 | return 0; | |
9ddf6323 | 669 | |
e1aaca93 PNA |
670 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
671 | if (flags & ~NFT_TABLE_F_DORMANT) | |
672 | return -EINVAL; | |
673 | ||
63283dd2 PNA |
674 | if (flags == ctx->table->flags) |
675 | return 0; | |
676 | ||
55dd6f93 PNA |
677 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
678 | sizeof(struct nft_trans_table)); | |
679 | if (trans == NULL) | |
680 | return -ENOMEM; | |
9ddf6323 | 681 | |
e1aaca93 PNA |
682 | if ((flags & NFT_TABLE_F_DORMANT) && |
683 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 684 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
685 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
686 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
c9c17211 | 687 | ret = nf_tables_table_enable(ctx->net, ctx->table); |
55dd6f93 | 688 | if (ret >= 0) { |
e1aaca93 | 689 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 690 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 691 | } |
9ddf6323 | 692 | } |
e1aaca93 PNA |
693 | if (ret < 0) |
694 | goto err; | |
9ddf6323 | 695 | |
55dd6f93 PNA |
696 | nft_trans_table_update(trans) = true; |
697 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
698 | return 0; | |
9ddf6323 | 699 | err: |
55dd6f93 | 700 | nft_trans_destroy(trans); |
9ddf6323 PNA |
701 | return ret; |
702 | } | |
703 | ||
633c9a84 PNA |
704 | static int nf_tables_newtable(struct net *net, struct sock *nlsk, |
705 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
706 | const struct nlattr * const nla[], |
707 | struct netlink_ext_ack *extack) | |
96518518 PM |
708 | { |
709 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 710 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
711 | const struct nlattr *name; |
712 | struct nft_af_info *afi; | |
713 | struct nft_table *table; | |
714 | int family = nfmsg->nfgen_family; | |
c5c1f975 | 715 | u32 flags = 0; |
e1aaca93 | 716 | struct nft_ctx ctx; |
55dd6f93 | 717 | int err; |
96518518 | 718 | |
99633ab2 | 719 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
720 | if (IS_ERR(afi)) |
721 | return PTR_ERR(afi); | |
722 | ||
723 | name = nla[NFTA_TABLE_NAME]; | |
f2a6d766 | 724 | table = nf_tables_table_lookup(afi, name, genmask); |
96518518 PM |
725 | if (IS_ERR(table)) { |
726 | if (PTR_ERR(table) != -ENOENT) | |
727 | return PTR_ERR(table); | |
1a28ad74 | 728 | } else { |
96518518 PM |
729 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
730 | return -EEXIST; | |
731 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
732 | return -EOPNOTSUPP; | |
e1aaca93 | 733 | |
633c9a84 | 734 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
e1aaca93 | 735 | return nf_tables_updtable(&ctx); |
96518518 PM |
736 | } |
737 | ||
c5c1f975 PM |
738 | if (nla[NFTA_TABLE_FLAGS]) { |
739 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
740 | if (flags & ~NFT_TABLE_F_DORMANT) | |
741 | return -EINVAL; | |
742 | } | |
743 | ||
ebddf1a8 | 744 | err = -EAFNOSUPPORT; |
7047f9d0 | 745 | if (!try_module_get(afi->owner)) |
ebddf1a8 | 746 | goto err1; |
7047f9d0 | 747 | |
ffdb210e | 748 | err = -ENOMEM; |
1cae565e | 749 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
ffdb210e | 750 | if (table == NULL) |
ebddf1a8 | 751 | goto err2; |
96518518 | 752 | |
e46abbcc PS |
753 | table->name = nla_strdup(name, GFP_KERNEL); |
754 | if (table->name == NULL) | |
755 | goto err3; | |
756 | ||
96518518 | 757 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 758 | INIT_LIST_HEAD(&table->sets); |
e5009240 | 759 | INIT_LIST_HEAD(&table->objects); |
3b49e2e9 | 760 | INIT_LIST_HEAD(&table->flowtables); |
c5c1f975 | 761 | table->flags = flags; |
9ddf6323 | 762 | |
633c9a84 | 763 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
55dd6f93 | 764 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
ffdb210e | 765 | if (err < 0) |
e46abbcc | 766 | goto err4; |
ffdb210e | 767 | |
e688a7f8 | 768 | list_add_tail_rcu(&table->list, &afi->tables); |
96518518 | 769 | return 0; |
e46abbcc PS |
770 | err4: |
771 | kfree(table->name); | |
ebddf1a8 | 772 | err3: |
ffdb210e | 773 | kfree(table); |
ebddf1a8 | 774 | err2: |
ffdb210e | 775 | module_put(afi->owner); |
ebddf1a8 | 776 | err1: |
ffdb210e | 777 | return err; |
96518518 PM |
778 | } |
779 | ||
b9ac12ef AB |
780 | static int nft_flush_table(struct nft_ctx *ctx) |
781 | { | |
3b49e2e9 | 782 | struct nft_flowtable *flowtable, *nft; |
b9ac12ef | 783 | struct nft_chain *chain, *nc; |
e5009240 | 784 | struct nft_object *obj, *ne; |
b9ac12ef | 785 | struct nft_set *set, *ns; |
3b49e2e9 | 786 | int err; |
b9ac12ef | 787 | |
a2f18db0 | 788 | list_for_each_entry(chain, &ctx->table->chains, list) { |
664b0f8c PNA |
789 | if (!nft_is_active_next(ctx->net, chain)) |
790 | continue; | |
791 | ||
b9ac12ef AB |
792 | ctx->chain = chain; |
793 | ||
794 | err = nft_delrule_by_chain(ctx); | |
795 | if (err < 0) | |
796 | goto out; | |
b9ac12ef AB |
797 | } |
798 | ||
799 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
37a9cc52 PNA |
800 | if (!nft_is_active_next(ctx->net, set)) |
801 | continue; | |
802 | ||
408070d6 | 803 | if (nft_set_is_anonymous(set) && |
b9ac12ef AB |
804 | !list_empty(&set->bindings)) |
805 | continue; | |
806 | ||
807 | err = nft_delset(ctx, set); | |
808 | if (err < 0) | |
809 | goto out; | |
810 | } | |
811 | ||
3b49e2e9 PNA |
812 | list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) { |
813 | err = nft_delflowtable(ctx, flowtable); | |
814 | if (err < 0) | |
815 | goto out; | |
816 | } | |
817 | ||
e5009240 PNA |
818 | list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { |
819 | err = nft_delobj(ctx, obj); | |
820 | if (err < 0) | |
821 | goto out; | |
822 | } | |
823 | ||
a2f18db0 | 824 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
664b0f8c PNA |
825 | if (!nft_is_active_next(ctx->net, chain)) |
826 | continue; | |
827 | ||
a2f18db0 PNA |
828 | ctx->chain = chain; |
829 | ||
830 | err = nft_delchain(ctx); | |
831 | if (err < 0) | |
832 | goto out; | |
833 | } | |
834 | ||
b9ac12ef AB |
835 | err = nft_deltable(ctx); |
836 | out: | |
837 | return err; | |
838 | } | |
839 | ||
840 | static int nft_flush(struct nft_ctx *ctx, int family) | |
841 | { | |
842 | struct nft_af_info *afi; | |
843 | struct nft_table *table, *nt; | |
844 | const struct nlattr * const *nla = ctx->nla; | |
845 | int err = 0; | |
846 | ||
847 | list_for_each_entry(afi, &ctx->net->nft.af_info, list) { | |
848 | if (family != AF_UNSPEC && afi->family != family) | |
849 | continue; | |
850 | ||
851 | ctx->afi = afi; | |
852 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
f2a6d766 PNA |
853 | if (!nft_is_active_next(ctx->net, table)) |
854 | continue; | |
855 | ||
b9ac12ef AB |
856 | if (nla[NFTA_TABLE_NAME] && |
857 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
858 | continue; | |
859 | ||
860 | ctx->table = table; | |
861 | ||
862 | err = nft_flush_table(ctx); | |
863 | if (err < 0) | |
864 | goto out; | |
865 | } | |
866 | } | |
867 | out: | |
868 | return err; | |
869 | } | |
870 | ||
633c9a84 PNA |
871 | static int nf_tables_deltable(struct net *net, struct sock *nlsk, |
872 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
873 | const struct nlattr * const nla[], |
874 | struct netlink_ext_ack *extack) | |
96518518 PM |
875 | { |
876 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 877 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
878 | struct nft_af_info *afi; |
879 | struct nft_table *table; | |
ee01d542 | 880 | int family = nfmsg->nfgen_family; |
55dd6f93 | 881 | struct nft_ctx ctx; |
96518518 | 882 | |
633c9a84 | 883 | nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla); |
b9ac12ef AB |
884 | if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL) |
885 | return nft_flush(&ctx, family); | |
886 | ||
99633ab2 | 887 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
888 | if (IS_ERR(afi)) |
889 | return PTR_ERR(afi); | |
890 | ||
f2a6d766 | 891 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask); |
96518518 PM |
892 | if (IS_ERR(table)) |
893 | return PTR_ERR(table); | |
96518518 | 894 | |
a8278400 PNA |
895 | if (nlh->nlmsg_flags & NLM_F_NONREC && |
896 | table->use > 0) | |
897 | return -EBUSY; | |
898 | ||
b9ac12ef AB |
899 | ctx.afi = afi; |
900 | ctx.table = table; | |
55dd6f93 | 901 | |
b9ac12ef | 902 | return nft_flush_table(&ctx); |
96518518 PM |
903 | } |
904 | ||
55dd6f93 PNA |
905 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
906 | { | |
4fefee57 PNA |
907 | BUG_ON(ctx->table->use > 0); |
908 | ||
e46abbcc | 909 | kfree(ctx->table->name); |
55dd6f93 PNA |
910 | kfree(ctx->table); |
911 | module_put(ctx->afi->owner); | |
912 | } | |
913 | ||
2a37d755 | 914 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 915 | { |
9370761c | 916 | int err = 0; |
96518518 | 917 | |
d8297d4f FW |
918 | if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO)) |
919 | return -EINVAL; | |
920 | ||
96518518 | 921 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c PNA |
922 | if (chain_type[ctype->family][ctype->type] != NULL) { |
923 | err = -EBUSY; | |
924 | goto out; | |
96518518 | 925 | } |
9370761c PNA |
926 | chain_type[ctype->family][ctype->type] = ctype; |
927 | out: | |
96518518 PM |
928 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
929 | return err; | |
930 | } | |
9370761c | 931 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 932 | |
2a37d755 | 933 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 934 | { |
96518518 | 935 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 936 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
937 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
938 | } | |
9370761c | 939 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
940 | |
941 | /* | |
942 | * Chains | |
943 | */ | |
944 | ||
945 | static struct nft_chain * | |
664b0f8c PNA |
946 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle, |
947 | u8 genmask) | |
96518518 PM |
948 | { |
949 | struct nft_chain *chain; | |
950 | ||
951 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
952 | if (chain->handle == handle && |
953 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
954 | return chain; |
955 | } | |
956 | ||
957 | return ERR_PTR(-ENOENT); | |
958 | } | |
959 | ||
960 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
664b0f8c PNA |
961 | const struct nlattr *nla, |
962 | u8 genmask) | |
96518518 PM |
963 | { |
964 | struct nft_chain *chain; | |
965 | ||
966 | if (nla == NULL) | |
967 | return ERR_PTR(-EINVAL); | |
968 | ||
969 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
970 | if (!nla_strcmp(nla, chain->name) && |
971 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
972 | return chain; |
973 | } | |
974 | ||
975 | return ERR_PTR(-ENOENT); | |
976 | } | |
977 | ||
978 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
b2fbd044 LZ |
979 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, |
980 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
981 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
982 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
983 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
984 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 985 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 986 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 987 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
988 | }; |
989 | ||
990 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
991 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
992 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
2cbce139 PNA |
993 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
994 | .len = IFNAMSIZ - 1 }, | |
96518518 PM |
995 | }; |
996 | ||
0ca743a5 PNA |
997 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
998 | { | |
999 | struct nft_stats *cpu_stats, total; | |
1000 | struct nlattr *nest; | |
ce355e20 ED |
1001 | unsigned int seq; |
1002 | u64 pkts, bytes; | |
0ca743a5 PNA |
1003 | int cpu; |
1004 | ||
1005 | memset(&total, 0, sizeof(total)); | |
1006 | for_each_possible_cpu(cpu) { | |
1007 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
1008 | do { |
1009 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
1010 | pkts = cpu_stats->pkts; | |
1011 | bytes = cpu_stats->bytes; | |
1012 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
1013 | total.pkts += pkts; | |
1014 | total.bytes += bytes; | |
0ca743a5 PNA |
1015 | } |
1016 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
1017 | if (nest == NULL) | |
1018 | goto nla_put_failure; | |
1019 | ||
b46f6ded ND |
1020 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), |
1021 | NFTA_COUNTER_PAD) || | |
1022 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), | |
1023 | NFTA_COUNTER_PAD)) | |
0ca743a5 PNA |
1024 | goto nla_put_failure; |
1025 | ||
1026 | nla_nest_end(skb, nest); | |
1027 | return 0; | |
1028 | ||
1029 | nla_put_failure: | |
1030 | return -ENOSPC; | |
1031 | } | |
1032 | ||
84d7fce6 PNA |
1033 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
1034 | u32 portid, u32 seq, int event, u32 flags, | |
1035 | int family, const struct nft_table *table, | |
96518518 PM |
1036 | const struct nft_chain *chain) |
1037 | { | |
1038 | struct nlmsghdr *nlh; | |
1039 | struct nfgenmsg *nfmsg; | |
1040 | ||
dedb67c4 | 1041 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
1042 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
1043 | if (nlh == NULL) | |
1044 | goto nla_put_failure; | |
1045 | ||
1046 | nfmsg = nlmsg_data(nlh); | |
1047 | nfmsg->nfgen_family = family; | |
1048 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1049 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1050 | |
1051 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
1052 | goto nla_put_failure; | |
b46f6ded ND |
1053 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), |
1054 | NFTA_CHAIN_PAD)) | |
96518518 PM |
1055 | goto nla_put_failure; |
1056 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
1057 | goto nla_put_failure; | |
1058 | ||
f323d954 | 1059 | if (nft_is_base_chain(chain)) { |
0ca743a5 | 1060 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
c974a3a3 | 1061 | const struct nf_hook_ops *ops = &basechain->ops; |
0ca743a5 PNA |
1062 | struct nlattr *nest; |
1063 | ||
1064 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
1065 | if (nest == NULL) |
1066 | goto nla_put_failure; | |
1067 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
1068 | goto nla_put_failure; | |
1069 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
1070 | goto nla_put_failure; | |
2cbce139 PNA |
1071 | if (basechain->dev_name[0] && |
1072 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) | |
1073 | goto nla_put_failure; | |
96518518 | 1074 | nla_nest_end(skb, nest); |
9370761c | 1075 | |
0ca743a5 PNA |
1076 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
1077 | htonl(basechain->policy))) | |
1078 | goto nla_put_failure; | |
1079 | ||
baae3e62 PM |
1080 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
1081 | goto nla_put_failure; | |
0ca743a5 | 1082 | |
5f9bfe0e | 1083 | if (basechain->stats && nft_dump_stats(skb, basechain->stats)) |
0ca743a5 | 1084 | goto nla_put_failure; |
96518518 PM |
1085 | } |
1086 | ||
0ca743a5 PNA |
1087 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
1088 | goto nla_put_failure; | |
1089 | ||
053c095a JB |
1090 | nlmsg_end(skb, nlh); |
1091 | return 0; | |
96518518 PM |
1092 | |
1093 | nla_put_failure: | |
1094 | nlmsg_trim(skb, nlh); | |
1095 | return -1; | |
1096 | } | |
1097 | ||
25e94a99 | 1098 | static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
1099 | { |
1100 | struct sk_buff *skb; | |
96518518 PM |
1101 | int err; |
1102 | ||
128ad332 PNA |
1103 | if (!ctx->report && |
1104 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 1105 | return; |
96518518 | 1106 | |
96518518 PM |
1107 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1108 | if (skb == NULL) | |
1109 | goto err; | |
1110 | ||
84d7fce6 PNA |
1111 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
1112 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 1113 | ctx->chain); |
96518518 PM |
1114 | if (err < 0) { |
1115 | kfree_skb(skb); | |
1116 | goto err; | |
1117 | } | |
1118 | ||
25e94a99 PNA |
1119 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1120 | ctx->report, GFP_KERNEL); | |
1121 | return; | |
96518518 | 1122 | err: |
25e94a99 | 1123 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
1124 | } |
1125 | ||
1126 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1127 | struct netlink_callback *cb) | |
1128 | { | |
1129 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1130 | const struct nft_af_info *afi; | |
1131 | const struct nft_table *table; | |
1132 | const struct nft_chain *chain; | |
1133 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1134 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1135 | int family = nfmsg->nfgen_family; |
1136 | ||
e688a7f8 | 1137 | rcu_read_lock(); |
38e029f1 PNA |
1138 | cb->seq = net->nft.base_seq; |
1139 | ||
e688a7f8 | 1140 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1141 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1142 | continue; | |
1143 | ||
e688a7f8 PNA |
1144 | list_for_each_entry_rcu(table, &afi->tables, list) { |
1145 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
96518518 PM |
1146 | if (idx < s_idx) |
1147 | goto cont; | |
1148 | if (idx > s_idx) | |
1149 | memset(&cb->args[1], 0, | |
1150 | sizeof(cb->args) - sizeof(cb->args[0])); | |
664b0f8c PNA |
1151 | if (!nft_is_active(net, chain)) |
1152 | continue; | |
84d7fce6 PNA |
1153 | if (nf_tables_fill_chain_info(skb, net, |
1154 | NETLINK_CB(cb->skb).portid, | |
96518518 PM |
1155 | cb->nlh->nlmsg_seq, |
1156 | NFT_MSG_NEWCHAIN, | |
1157 | NLM_F_MULTI, | |
1158 | afi->family, table, chain) < 0) | |
1159 | goto done; | |
38e029f1 PNA |
1160 | |
1161 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
1162 | cont: |
1163 | idx++; | |
1164 | } | |
1165 | } | |
1166 | } | |
1167 | done: | |
e688a7f8 | 1168 | rcu_read_unlock(); |
96518518 PM |
1169 | cb->args[0] = idx; |
1170 | return skb->len; | |
1171 | } | |
1172 | ||
7b8002a1 PNA |
1173 | static int nf_tables_getchain(struct net *net, struct sock *nlsk, |
1174 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1175 | const struct nlattr * const nla[], |
1176 | struct netlink_ext_ack *extack) | |
96518518 PM |
1177 | { |
1178 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1179 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
1180 | const struct nft_af_info *afi; |
1181 | const struct nft_table *table; | |
1182 | const struct nft_chain *chain; | |
1183 | struct sk_buff *skb2; | |
1184 | int family = nfmsg->nfgen_family; | |
1185 | int err; | |
1186 | ||
1187 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1188 | struct netlink_dump_control c = { | |
1189 | .dump = nf_tables_dump_chains, | |
1190 | }; | |
1191 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1192 | } | |
1193 | ||
99633ab2 | 1194 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1195 | if (IS_ERR(afi)) |
1196 | return PTR_ERR(afi); | |
1197 | ||
f2a6d766 | 1198 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1199 | if (IS_ERR(table)) |
1200 | return PTR_ERR(table); | |
1201 | ||
664b0f8c | 1202 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1203 | if (IS_ERR(chain)) |
1204 | return PTR_ERR(chain); | |
1205 | ||
1206 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1207 | if (!skb2) | |
1208 | return -ENOMEM; | |
1209 | ||
84d7fce6 | 1210 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1211 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1212 | family, table, chain); | |
1213 | if (err < 0) | |
1214 | goto err; | |
1215 | ||
1216 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1217 | ||
1218 | err: | |
1219 | kfree_skb(skb2); | |
1220 | return err; | |
1221 | } | |
1222 | ||
0ca743a5 PNA |
1223 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1224 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1225 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1226 | }; | |
1227 | ||
ff3cd7b3 | 1228 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1229 | { |
1230 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1231 | struct nft_stats __percpu *newstats; | |
1232 | struct nft_stats *stats; | |
1233 | int err; | |
1234 | ||
fceb6435 JB |
1235 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy, |
1236 | NULL); | |
0ca743a5 | 1237 | if (err < 0) |
ff3cd7b3 | 1238 | return ERR_PTR(err); |
0ca743a5 PNA |
1239 | |
1240 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1241 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1242 | |
ce355e20 | 1243 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1244 | if (newstats == NULL) |
ff3cd7b3 | 1245 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1246 | |
1247 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1248 | * are not exposed to userspace. | |
1249 | */ | |
e8781f70 | 1250 | preempt_disable(); |
0ca743a5 PNA |
1251 | stats = this_cpu_ptr(newstats); |
1252 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1253 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1254 | preempt_enable(); |
0ca743a5 | 1255 | |
ff3cd7b3 PNA |
1256 | return newstats; |
1257 | } | |
1258 | ||
1259 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
1260 | struct nft_stats __percpu *newstats) | |
1261 | { | |
0befd061 PNA |
1262 | struct nft_stats __percpu *oldstats; |
1263 | ||
b88825de PNA |
1264 | if (newstats == NULL) |
1265 | return; | |
1266 | ||
0ca743a5 | 1267 | if (chain->stats) { |
0befd061 | 1268 | oldstats = nfnl_dereference(chain->stats, NFNL_SUBSYS_NFTABLES); |
0ca743a5 PNA |
1269 | rcu_assign_pointer(chain->stats, newstats); |
1270 | synchronize_rcu(); | |
1271 | free_percpu(oldstats); | |
1272 | } else | |
1273 | rcu_assign_pointer(chain->stats, newstats); | |
0ca743a5 PNA |
1274 | } |
1275 | ||
91c7b38d PNA |
1276 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
1277 | { | |
1278 | BUG_ON(chain->use > 0); | |
1279 | ||
f323d954 | 1280 | if (nft_is_base_chain(chain)) { |
2cbce139 PNA |
1281 | struct nft_base_chain *basechain = nft_base_chain(chain); |
1282 | ||
1283 | module_put(basechain->type->owner); | |
1284 | free_percpu(basechain->stats); | |
9f08ea84 PNA |
1285 | if (basechain->stats) |
1286 | static_branch_dec(&nft_counters_enabled); | |
c974a3a3 PNA |
1287 | if (basechain->ops.dev != NULL) |
1288 | dev_put(basechain->ops.dev); | |
b7263e07 | 1289 | kfree(chain->name); |
2cbce139 | 1290 | kfree(basechain); |
91c7b38d | 1291 | } else { |
b7263e07 | 1292 | kfree(chain->name); |
91c7b38d PNA |
1293 | kfree(chain); |
1294 | } | |
1295 | } | |
1296 | ||
508f8ccd PNA |
1297 | struct nft_chain_hook { |
1298 | u32 num; | |
84ba7dd7 | 1299 | s32 priority; |
508f8ccd PNA |
1300 | const struct nf_chain_type *type; |
1301 | struct net_device *dev; | |
1302 | }; | |
1303 | ||
1304 | static int nft_chain_parse_hook(struct net *net, | |
1305 | const struct nlattr * const nla[], | |
1306 | struct nft_af_info *afi, | |
1307 | struct nft_chain_hook *hook, bool create) | |
1308 | { | |
1309 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; | |
1310 | const struct nf_chain_type *type; | |
1311 | struct net_device *dev; | |
1312 | int err; | |
1313 | ||
1314 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
fceb6435 | 1315 | nft_hook_policy, NULL); |
508f8ccd PNA |
1316 | if (err < 0) |
1317 | return err; | |
1318 | ||
1319 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1320 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1321 | return -EINVAL; | |
1322 | ||
1323 | hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
508f8ccd PNA |
1324 | hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
1325 | ||
1326 | type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT]; | |
1327 | if (nla[NFTA_CHAIN_TYPE]) { | |
1328 | type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE], | |
1329 | create); | |
1330 | if (IS_ERR(type)) | |
1331 | return PTR_ERR(type); | |
1332 | } | |
1333 | if (!(type->hook_mask & (1 << hook->num))) | |
1334 | return -EOPNOTSUPP; | |
84ba7dd7 FW |
1335 | |
1336 | if (type->type == NFT_CHAIN_T_NAT && | |
1337 | hook->priority <= NF_IP_PRI_CONNTRACK) | |
1338 | return -EOPNOTSUPP; | |
1339 | ||
508f8ccd PNA |
1340 | if (!try_module_get(type->owner)) |
1341 | return -ENOENT; | |
1342 | ||
1343 | hook->type = type; | |
1344 | ||
1345 | hook->dev = NULL; | |
e7bb5c71 | 1346 | if (afi->family == NFPROTO_NETDEV) { |
508f8ccd PNA |
1347 | char ifname[IFNAMSIZ]; |
1348 | ||
1349 | if (!ha[NFTA_HOOK_DEV]) { | |
1350 | module_put(type->owner); | |
1351 | return -EOPNOTSUPP; | |
1352 | } | |
1353 | ||
1354 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); | |
1355 | dev = dev_get_by_name(net, ifname); | |
1356 | if (!dev) { | |
1357 | module_put(type->owner); | |
1358 | return -ENOENT; | |
1359 | } | |
1360 | hook->dev = dev; | |
1361 | } else if (ha[NFTA_HOOK_DEV]) { | |
1362 | module_put(type->owner); | |
1363 | return -EOPNOTSUPP; | |
1364 | } | |
1365 | ||
1366 | return 0; | |
1367 | } | |
1368 | ||
1369 | static void nft_chain_release_hook(struct nft_chain_hook *hook) | |
1370 | { | |
1371 | module_put(hook->type->owner); | |
1372 | if (hook->dev != NULL) | |
1373 | dev_put(hook->dev); | |
1374 | } | |
1375 | ||
4035285f PNA |
1376 | static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask, |
1377 | u8 policy, bool create) | |
1378 | { | |
1379 | const struct nlattr * const *nla = ctx->nla; | |
1380 | struct nft_table *table = ctx->table; | |
1381 | struct nft_af_info *afi = ctx->afi; | |
1382 | struct nft_base_chain *basechain; | |
1383 | struct nft_stats __percpu *stats; | |
1384 | struct net *net = ctx->net; | |
1385 | struct nft_chain *chain; | |
4035285f PNA |
1386 | int err; |
1387 | ||
1388 | if (table->use == UINT_MAX) | |
1389 | return -EOVERFLOW; | |
1390 | ||
1391 | if (nla[NFTA_CHAIN_HOOK]) { | |
1392 | struct nft_chain_hook hook; | |
1393 | struct nf_hook_ops *ops; | |
4035285f PNA |
1394 | |
1395 | err = nft_chain_parse_hook(net, nla, afi, &hook, create); | |
1396 | if (err < 0) | |
1397 | return err; | |
1398 | ||
1399 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); | |
1400 | if (basechain == NULL) { | |
1401 | nft_chain_release_hook(&hook); | |
1402 | return -ENOMEM; | |
1403 | } | |
1404 | ||
1405 | if (hook.dev != NULL) | |
1406 | strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ); | |
1407 | ||
1408 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1409 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1410 | if (IS_ERR(stats)) { | |
1411 | nft_chain_release_hook(&hook); | |
1412 | kfree(basechain); | |
1413 | return PTR_ERR(stats); | |
1414 | } | |
1415 | basechain->stats = stats; | |
1416 | static_branch_inc(&nft_counters_enabled); | |
1417 | } | |
1418 | ||
4035285f PNA |
1419 | basechain->type = hook.type; |
1420 | chain = &basechain->chain; | |
1421 | ||
c974a3a3 PNA |
1422 | ops = &basechain->ops; |
1423 | ops->pf = family; | |
1424 | ops->hooknum = hook.num; | |
1425 | ops->priority = hook.priority; | |
1426 | ops->priv = chain; | |
c2f9eafe | 1427 | ops->hook = hook.type->hooks[ops->hooknum]; |
c974a3a3 | 1428 | ops->dev = hook.dev; |
c974a3a3 PNA |
1429 | |
1430 | if (basechain->type->type == NFT_CHAIN_T_NAT) | |
1431 | ops->nat_hook = true; | |
4035285f PNA |
1432 | |
1433 | chain->flags |= NFT_BASE_CHAIN; | |
1434 | basechain->policy = policy; | |
1435 | } else { | |
1436 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1437 | if (chain == NULL) | |
1438 | return -ENOMEM; | |
1439 | } | |
1440 | INIT_LIST_HEAD(&chain->rules); | |
1441 | chain->handle = nf_tables_alloc_handle(table); | |
1442 | chain->table = table; | |
1443 | chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL); | |
1444 | if (!chain->name) { | |
1445 | err = -ENOMEM; | |
1446 | goto err1; | |
1447 | } | |
1448 | ||
c974a3a3 | 1449 | err = nf_tables_register_hook(net, table, chain); |
4035285f PNA |
1450 | if (err < 0) |
1451 | goto err1; | |
1452 | ||
1453 | ctx->chain = chain; | |
1454 | err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN); | |
1455 | if (err < 0) | |
1456 | goto err2; | |
1457 | ||
1458 | table->use++; | |
1459 | list_add_tail_rcu(&chain->list, &table->chains); | |
1460 | ||
1461 | return 0; | |
1462 | err2: | |
c974a3a3 | 1463 | nf_tables_unregister_hook(net, table, chain); |
4035285f PNA |
1464 | err1: |
1465 | nf_tables_chain_destroy(chain); | |
1466 | ||
1467 | return err; | |
1468 | } | |
1469 | ||
2c4a488a PNA |
1470 | static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy, |
1471 | bool create) | |
1472 | { | |
1473 | const struct nlattr * const *nla = ctx->nla; | |
1474 | struct nft_table *table = ctx->table; | |
1475 | struct nft_chain *chain = ctx->chain; | |
2c4a488a PNA |
1476 | struct nft_base_chain *basechain; |
1477 | struct nft_stats *stats = NULL; | |
1478 | struct nft_chain_hook hook; | |
1479 | const struct nlattr *name; | |
1480 | struct nf_hook_ops *ops; | |
1481 | struct nft_trans *trans; | |
c974a3a3 | 1482 | int err; |
2c4a488a PNA |
1483 | |
1484 | if (nla[NFTA_CHAIN_HOOK]) { | |
1485 | if (!nft_is_base_chain(chain)) | |
1486 | return -EBUSY; | |
1487 | ||
1488 | err = nft_chain_parse_hook(ctx->net, nla, ctx->afi, &hook, | |
1489 | create); | |
1490 | if (err < 0) | |
1491 | return err; | |
1492 | ||
1493 | basechain = nft_base_chain(chain); | |
1494 | if (basechain->type != hook.type) { | |
1495 | nft_chain_release_hook(&hook); | |
1496 | return -EBUSY; | |
1497 | } | |
1498 | ||
c974a3a3 PNA |
1499 | ops = &basechain->ops; |
1500 | if (ops->hooknum != hook.num || | |
1501 | ops->priority != hook.priority || | |
1502 | ops->dev != hook.dev) { | |
1503 | nft_chain_release_hook(&hook); | |
1504 | return -EBUSY; | |
2c4a488a PNA |
1505 | } |
1506 | nft_chain_release_hook(&hook); | |
1507 | } | |
1508 | ||
1509 | if (nla[NFTA_CHAIN_HANDLE] && | |
1510 | nla[NFTA_CHAIN_NAME]) { | |
1511 | struct nft_chain *chain2; | |
1512 | ||
1513 | chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], | |
1514 | genmask); | |
0d18779b JC |
1515 | if (!IS_ERR(chain2)) |
1516 | return -EEXIST; | |
2c4a488a PNA |
1517 | } |
1518 | ||
1519 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1520 | if (!nft_is_base_chain(chain)) | |
1521 | return -EOPNOTSUPP; | |
1522 | ||
1523 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1524 | if (IS_ERR(stats)) | |
1525 | return PTR_ERR(stats); | |
1526 | } | |
1527 | ||
1528 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, | |
1529 | sizeof(struct nft_trans_chain)); | |
1530 | if (trans == NULL) { | |
1531 | free_percpu(stats); | |
1532 | return -ENOMEM; | |
1533 | } | |
1534 | ||
1535 | nft_trans_chain_stats(trans) = stats; | |
1536 | nft_trans_chain_update(trans) = true; | |
1537 | ||
1538 | if (nla[NFTA_CHAIN_POLICY]) | |
1539 | nft_trans_chain_policy(trans) = policy; | |
1540 | else | |
1541 | nft_trans_chain_policy(trans) = -1; | |
1542 | ||
1543 | name = nla[NFTA_CHAIN_NAME]; | |
1544 | if (nla[NFTA_CHAIN_HANDLE] && name) { | |
1545 | nft_trans_chain_name(trans) = | |
1546 | nla_strdup(name, GFP_KERNEL); | |
1547 | if (!nft_trans_chain_name(trans)) { | |
1548 | kfree(trans); | |
1549 | free_percpu(stats); | |
1550 | return -ENOMEM; | |
1551 | } | |
1552 | } | |
1553 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
1554 | ||
1555 | return 0; | |
1556 | } | |
1557 | ||
633c9a84 PNA |
1558 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
1559 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1560 | const struct nlattr * const nla[], |
1561 | struct netlink_ext_ack *extack) | |
96518518 PM |
1562 | { |
1563 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1564 | const struct nlattr * uninitialized_var(name); | |
4035285f PNA |
1565 | u8 genmask = nft_genmask_next(net); |
1566 | int family = nfmsg->nfgen_family; | |
7c95f6d8 | 1567 | struct nft_af_info *afi; |
96518518 PM |
1568 | struct nft_table *table; |
1569 | struct nft_chain *chain; | |
57de2a0c | 1570 | u8 policy = NF_ACCEPT; |
4035285f | 1571 | struct nft_ctx ctx; |
96518518 | 1572 | u64 handle = 0; |
96518518 PM |
1573 | bool create; |
1574 | ||
1575 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1576 | ||
99633ab2 | 1577 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
1578 | if (IS_ERR(afi)) |
1579 | return PTR_ERR(afi); | |
1580 | ||
f2a6d766 | 1581 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1582 | if (IS_ERR(table)) |
1583 | return PTR_ERR(table); | |
1584 | ||
96518518 PM |
1585 | chain = NULL; |
1586 | name = nla[NFTA_CHAIN_NAME]; | |
1587 | ||
1588 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1589 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
664b0f8c | 1590 | chain = nf_tables_chain_lookup_byhandle(table, handle, genmask); |
96518518 PM |
1591 | if (IS_ERR(chain)) |
1592 | return PTR_ERR(chain); | |
1593 | } else { | |
664b0f8c | 1594 | chain = nf_tables_chain_lookup(table, name, genmask); |
96518518 PM |
1595 | if (IS_ERR(chain)) { |
1596 | if (PTR_ERR(chain) != -ENOENT) | |
1597 | return PTR_ERR(chain); | |
1598 | chain = NULL; | |
1599 | } | |
1600 | } | |
1601 | ||
57de2a0c | 1602 | if (nla[NFTA_CHAIN_POLICY]) { |
f323d954 PNA |
1603 | if (chain != NULL && |
1604 | !nft_is_base_chain(chain)) | |
d6b6cb1d PNA |
1605 | return -EOPNOTSUPP; |
1606 | ||
1607 | if (chain == NULL && | |
57de2a0c PM |
1608 | nla[NFTA_CHAIN_HOOK] == NULL) |
1609 | return -EOPNOTSUPP; | |
1610 | ||
8f46df18 | 1611 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1612 | switch (policy) { |
1613 | case NF_DROP: | |
1614 | case NF_ACCEPT: | |
1615 | break; | |
1616 | default: | |
1617 | return -EINVAL; | |
1618 | } | |
1619 | } | |
1620 | ||
4035285f PNA |
1621 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
1622 | ||
96518518 PM |
1623 | if (chain != NULL) { |
1624 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1625 | return -EEXIST; | |
1626 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1627 | return -EOPNOTSUPP; | |
1628 | ||
2c4a488a | 1629 | return nf_tables_updchain(&ctx, genmask, policy, create); |
96518518 PM |
1630 | } |
1631 | ||
4035285f | 1632 | return nf_tables_addchain(&ctx, family, genmask, policy, create); |
96518518 PM |
1633 | } |
1634 | ||
633c9a84 PNA |
1635 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
1636 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1637 | const struct nlattr * const nla[], |
1638 | struct netlink_ext_ack *extack) | |
96518518 PM |
1639 | { |
1640 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1641 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 1642 | struct nft_af_info *afi; |
96518518 PM |
1643 | struct nft_table *table; |
1644 | struct nft_chain *chain; | |
9dee1474 | 1645 | struct nft_rule *rule; |
96518518 | 1646 | int family = nfmsg->nfgen_family; |
91c7b38d | 1647 | struct nft_ctx ctx; |
9dee1474 PNA |
1648 | u32 use; |
1649 | int err; | |
96518518 | 1650 | |
99633ab2 | 1651 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1652 | if (IS_ERR(afi)) |
1653 | return PTR_ERR(afi); | |
1654 | ||
f2a6d766 | 1655 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask); |
96518518 PM |
1656 | if (IS_ERR(table)) |
1657 | return PTR_ERR(table); | |
1658 | ||
664b0f8c | 1659 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1660 | if (IS_ERR(chain)) |
1661 | return PTR_ERR(chain); | |
9dee1474 PNA |
1662 | |
1663 | if (nlh->nlmsg_flags & NLM_F_NONREC && | |
1664 | chain->use > 0) | |
96518518 PM |
1665 | return -EBUSY; |
1666 | ||
633c9a84 | 1667 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0165d932 | 1668 | |
9dee1474 PNA |
1669 | use = chain->use; |
1670 | list_for_each_entry(rule, &chain->rules, list) { | |
1671 | if (!nft_is_active_next(net, rule)) | |
1672 | continue; | |
1673 | use--; | |
1674 | ||
1675 | err = nft_delrule(&ctx, rule); | |
1676 | if (err < 0) | |
1677 | return err; | |
1678 | } | |
1679 | ||
1680 | /* There are rules and elements that are still holding references to us, | |
1681 | * we cannot do a recursive removal in this case. | |
1682 | */ | |
1683 | if (use > 0) | |
1684 | return -EBUSY; | |
1685 | ||
ee01d542 | 1686 | return nft_delchain(&ctx); |
96518518 PM |
1687 | } |
1688 | ||
96518518 PM |
1689 | /* |
1690 | * Expressions | |
1691 | */ | |
1692 | ||
1693 | /** | |
ef1f7df9 PM |
1694 | * nft_register_expr - register nf_tables expr type |
1695 | * @ops: expr type | |
96518518 | 1696 | * |
ef1f7df9 | 1697 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1698 | * success or a negative errno code otherwise. |
1699 | */ | |
ef1f7df9 | 1700 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1701 | { |
1702 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1703 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1704 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1705 | else |
e688a7f8 | 1706 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1707 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1708 | return 0; | |
1709 | } | |
1710 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1711 | ||
1712 | /** | |
ef1f7df9 PM |
1713 | * nft_unregister_expr - unregister nf_tables expr type |
1714 | * @ops: expr type | |
96518518 | 1715 | * |
ef1f7df9 | 1716 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1717 | */ |
ef1f7df9 | 1718 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1719 | { |
1720 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1721 | list_del_rcu(&type->list); |
96518518 PM |
1722 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1723 | } | |
1724 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1725 | ||
64d46806 PM |
1726 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1727 | struct nlattr *nla) | |
96518518 | 1728 | { |
ef1f7df9 | 1729 | const struct nft_expr_type *type; |
96518518 | 1730 | |
ef1f7df9 | 1731 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1732 | if (!nla_strcmp(nla, type->name) && |
1733 | (!type->family || type->family == family)) | |
ef1f7df9 | 1734 | return type; |
96518518 PM |
1735 | } |
1736 | return NULL; | |
1737 | } | |
1738 | ||
64d46806 PM |
1739 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1740 | struct nlattr *nla) | |
96518518 | 1741 | { |
ef1f7df9 | 1742 | const struct nft_expr_type *type; |
96518518 PM |
1743 | |
1744 | if (nla == NULL) | |
1745 | return ERR_PTR(-EINVAL); | |
1746 | ||
64d46806 | 1747 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1748 | if (type != NULL && try_module_get(type->owner)) |
1749 | return type; | |
96518518 PM |
1750 | |
1751 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1752 | if (type == NULL) { |
64d46806 PM |
1753 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1754 | request_module("nft-expr-%u-%.*s", family, | |
1755 | nla_len(nla), (char *)nla_data(nla)); | |
1756 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1757 | if (__nft_expr_type_get(family, nla)) | |
1758 | return ERR_PTR(-EAGAIN); | |
1759 | ||
96518518 PM |
1760 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1761 | request_module("nft-expr-%.*s", | |
1762 | nla_len(nla), (char *)nla_data(nla)); | |
1763 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1764 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1765 | return ERR_PTR(-EAGAIN); |
1766 | } | |
1767 | #endif | |
1768 | return ERR_PTR(-ENOENT); | |
1769 | } | |
1770 | ||
1771 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1772 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1773 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1774 | }; | |
1775 | ||
1776 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1777 | const struct nft_expr *expr) | |
1778 | { | |
ef1f7df9 | 1779 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1780 | goto nla_put_failure; |
1781 | ||
1782 | if (expr->ops->dump) { | |
1783 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1784 | if (data == NULL) | |
1785 | goto nla_put_failure; | |
1786 | if (expr->ops->dump(skb, expr) < 0) | |
1787 | goto nla_put_failure; | |
1788 | nla_nest_end(skb, data); | |
1789 | } | |
1790 | ||
1791 | return skb->len; | |
1792 | ||
1793 | nla_put_failure: | |
1794 | return -1; | |
1795 | }; | |
1796 | ||
0b2d8a7b PM |
1797 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
1798 | const struct nft_expr *expr) | |
1799 | { | |
1800 | struct nlattr *nest; | |
1801 | ||
1802 | nest = nla_nest_start(skb, attr); | |
1803 | if (!nest) | |
1804 | goto nla_put_failure; | |
1805 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1806 | goto nla_put_failure; | |
1807 | nla_nest_end(skb, nest); | |
1808 | return 0; | |
1809 | ||
1810 | nla_put_failure: | |
1811 | return -1; | |
1812 | } | |
1813 | ||
96518518 PM |
1814 | struct nft_expr_info { |
1815 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1816 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1817 | }; |
1818 | ||
0ca743a5 PNA |
1819 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1820 | const struct nlattr *nla, | |
96518518 PM |
1821 | struct nft_expr_info *info) |
1822 | { | |
ef1f7df9 | 1823 | const struct nft_expr_type *type; |
96518518 | 1824 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1825 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1826 | int err; |
1827 | ||
fceb6435 | 1828 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL); |
96518518 PM |
1829 | if (err < 0) |
1830 | return err; | |
1831 | ||
64d46806 | 1832 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1833 | if (IS_ERR(type)) |
1834 | return PTR_ERR(type); | |
1835 | ||
1836 | if (tb[NFTA_EXPR_DATA]) { | |
1837 | err = nla_parse_nested(info->tb, type->maxattr, | |
fceb6435 | 1838 | tb[NFTA_EXPR_DATA], type->policy, NULL); |
ef1f7df9 PM |
1839 | if (err < 0) |
1840 | goto err1; | |
1841 | } else | |
1842 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1843 | ||
1844 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1845 | ops = type->select_ops(ctx, |
1846 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1847 | if (IS_ERR(ops)) { |
1848 | err = PTR_ERR(ops); | |
1849 | goto err1; | |
1850 | } | |
1851 | } else | |
1852 | ops = type->ops; | |
1853 | ||
96518518 PM |
1854 | info->ops = ops; |
1855 | return 0; | |
ef1f7df9 PM |
1856 | |
1857 | err1: | |
1858 | module_put(type->owner); | |
1859 | return err; | |
96518518 PM |
1860 | } |
1861 | ||
1862 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1863 | const struct nft_expr_info *info, |
96518518 PM |
1864 | struct nft_expr *expr) |
1865 | { | |
1866 | const struct nft_expr_ops *ops = info->ops; | |
1867 | int err; | |
1868 | ||
1869 | expr->ops = ops; | |
1870 | if (ops->init) { | |
ef1f7df9 | 1871 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1872 | if (err < 0) |
1873 | goto err1; | |
1874 | } | |
1875 | ||
c56e3956 LZ |
1876 | if (ops->validate) { |
1877 | const struct nft_data *data = NULL; | |
1878 | ||
1879 | err = ops->validate(ctx, expr, &data); | |
1880 | if (err < 0) | |
1881 | goto err2; | |
1882 | } | |
1883 | ||
96518518 PM |
1884 | return 0; |
1885 | ||
c56e3956 LZ |
1886 | err2: |
1887 | if (ops->destroy) | |
1888 | ops->destroy(ctx, expr); | |
96518518 PM |
1889 | err1: |
1890 | expr->ops = NULL; | |
1891 | return err; | |
1892 | } | |
1893 | ||
62472bce PM |
1894 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1895 | struct nft_expr *expr) | |
96518518 PM |
1896 | { |
1897 | if (expr->ops->destroy) | |
62472bce | 1898 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1899 | module_put(expr->ops->type->owner); |
96518518 PM |
1900 | } |
1901 | ||
0b2d8a7b PM |
1902 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
1903 | const struct nlattr *nla) | |
1904 | { | |
1905 | struct nft_expr_info info; | |
1906 | struct nft_expr *expr; | |
1907 | int err; | |
1908 | ||
1909 | err = nf_tables_expr_parse(ctx, nla, &info); | |
1910 | if (err < 0) | |
1911 | goto err1; | |
1912 | ||
1913 | err = -ENOMEM; | |
1914 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
1915 | if (expr == NULL) | |
1916 | goto err2; | |
1917 | ||
1918 | err = nf_tables_newexpr(ctx, &info, expr); | |
1919 | if (err < 0) | |
6cafaf47 | 1920 | goto err3; |
0b2d8a7b PM |
1921 | |
1922 | return expr; | |
6cafaf47 LZ |
1923 | err3: |
1924 | kfree(expr); | |
0b2d8a7b PM |
1925 | err2: |
1926 | module_put(info.ops->type->owner); | |
1927 | err1: | |
1928 | return ERR_PTR(err); | |
1929 | } | |
1930 | ||
1931 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
1932 | { | |
1933 | nf_tables_expr_destroy(ctx, expr); | |
1934 | kfree(expr); | |
1935 | } | |
1936 | ||
96518518 PM |
1937 | /* |
1938 | * Rules | |
1939 | */ | |
1940 | ||
1941 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1942 | u64 handle) | |
1943 | { | |
1944 | struct nft_rule *rule; | |
1945 | ||
1946 | // FIXME: this sucks | |
1947 | list_for_each_entry(rule, &chain->rules, list) { | |
1948 | if (handle == rule->handle) | |
1949 | return rule; | |
1950 | } | |
1951 | ||
1952 | return ERR_PTR(-ENOENT); | |
1953 | } | |
1954 | ||
1955 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1956 | const struct nlattr *nla) | |
1957 | { | |
1958 | if (nla == NULL) | |
1959 | return ERR_PTR(-EINVAL); | |
1960 | ||
1961 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1962 | } | |
1963 | ||
1964 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
b2fbd044 LZ |
1965 | [NFTA_RULE_TABLE] = { .type = NLA_STRING, |
1966 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
1967 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
1968 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1969 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1970 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1971 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1972 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1973 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1974 | .len = NFT_USERDATA_MAXLEN }, | |
96518518 PM |
1975 | }; |
1976 | ||
84d7fce6 PNA |
1977 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
1978 | u32 portid, u32 seq, int event, | |
1979 | u32 flags, int family, | |
96518518 PM |
1980 | const struct nft_table *table, |
1981 | const struct nft_chain *chain, | |
1982 | const struct nft_rule *rule) | |
1983 | { | |
1984 | struct nlmsghdr *nlh; | |
1985 | struct nfgenmsg *nfmsg; | |
1986 | const struct nft_expr *expr, *next; | |
1987 | struct nlattr *list; | |
5e948466 | 1988 | const struct nft_rule *prule; |
dedb67c4 | 1989 | u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 | 1990 | |
dedb67c4 | 1991 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags); |
96518518 PM |
1992 | if (nlh == NULL) |
1993 | goto nla_put_failure; | |
1994 | ||
1995 | nfmsg = nlmsg_data(nlh); | |
1996 | nfmsg->nfgen_family = family; | |
1997 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1998 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1999 | |
2000 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
2001 | goto nla_put_failure; | |
2002 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
2003 | goto nla_put_failure; | |
b46f6ded ND |
2004 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), |
2005 | NFTA_RULE_PAD)) | |
96518518 PM |
2006 | goto nla_put_failure; |
2007 | ||
5e948466 | 2008 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
cbbb40e2 | 2009 | prule = list_prev_entry(rule, list); |
5e948466 | 2010 | if (nla_put_be64(skb, NFTA_RULE_POSITION, |
b46f6ded ND |
2011 | cpu_to_be64(prule->handle), |
2012 | NFTA_RULE_PAD)) | |
5e948466 EL |
2013 | goto nla_put_failure; |
2014 | } | |
2015 | ||
96518518 PM |
2016 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
2017 | if (list == NULL) | |
2018 | goto nla_put_failure; | |
2019 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 2020 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 2021 | goto nla_put_failure; |
96518518 PM |
2022 | } |
2023 | nla_nest_end(skb, list); | |
2024 | ||
86f1ec32 PM |
2025 | if (rule->udata) { |
2026 | struct nft_userdata *udata = nft_userdata(rule); | |
2027 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
2028 | udata->data) < 0) | |
2029 | goto nla_put_failure; | |
2030 | } | |
0768b3b3 | 2031 | |
053c095a JB |
2032 | nlmsg_end(skb, nlh); |
2033 | return 0; | |
96518518 PM |
2034 | |
2035 | nla_put_failure: | |
2036 | nlmsg_trim(skb, nlh); | |
2037 | return -1; | |
2038 | } | |
2039 | ||
25e94a99 PNA |
2040 | static void nf_tables_rule_notify(const struct nft_ctx *ctx, |
2041 | const struct nft_rule *rule, int event) | |
96518518 PM |
2042 | { |
2043 | struct sk_buff *skb; | |
96518518 PM |
2044 | int err; |
2045 | ||
128ad332 PNA |
2046 | if (!ctx->report && |
2047 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 2048 | return; |
96518518 | 2049 | |
96518518 PM |
2050 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
2051 | if (skb == NULL) | |
2052 | goto err; | |
2053 | ||
84d7fce6 PNA |
2054 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
2055 | event, 0, ctx->afi->family, ctx->table, | |
35151d84 | 2056 | ctx->chain, rule); |
96518518 PM |
2057 | if (err < 0) { |
2058 | kfree_skb(skb); | |
2059 | goto err; | |
2060 | } | |
2061 | ||
25e94a99 PNA |
2062 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
2063 | ctx->report, GFP_KERNEL); | |
2064 | return; | |
96518518 | 2065 | err: |
25e94a99 | 2066 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
2067 | } |
2068 | ||
6e1f760e | 2069 | struct nft_rule_dump_ctx { |
e46abbcc | 2070 | char *table; |
b7263e07 | 2071 | char *chain; |
6e1f760e PNA |
2072 | }; |
2073 | ||
96518518 PM |
2074 | static int nf_tables_dump_rules(struct sk_buff *skb, |
2075 | struct netlink_callback *cb) | |
2076 | { | |
2077 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
6e1f760e | 2078 | const struct nft_rule_dump_ctx *ctx = cb->data; |
96518518 PM |
2079 | const struct nft_af_info *afi; |
2080 | const struct nft_table *table; | |
2081 | const struct nft_chain *chain; | |
2082 | const struct nft_rule *rule; | |
2083 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 2084 | struct net *net = sock_net(skb->sk); |
96518518 PM |
2085 | int family = nfmsg->nfgen_family; |
2086 | ||
e688a7f8 | 2087 | rcu_read_lock(); |
38e029f1 PNA |
2088 | cb->seq = net->nft.base_seq; |
2089 | ||
e688a7f8 | 2090 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
2091 | if (family != NFPROTO_UNSPEC && family != afi->family) |
2092 | continue; | |
2093 | ||
e688a7f8 | 2094 | list_for_each_entry_rcu(table, &afi->tables, list) { |
e46abbcc | 2095 | if (ctx && ctx->table && |
6e1f760e PNA |
2096 | strcmp(ctx->table, table->name) != 0) |
2097 | continue; | |
2098 | ||
e688a7f8 | 2099 | list_for_each_entry_rcu(chain, &table->chains, list) { |
24c0df82 | 2100 | if (ctx && ctx->chain && |
6e1f760e PNA |
2101 | strcmp(ctx->chain, chain->name) != 0) |
2102 | continue; | |
2103 | ||
e688a7f8 | 2104 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
889f7ee7 | 2105 | if (!nft_is_active(net, rule)) |
0628b123 | 2106 | goto cont; |
96518518 PM |
2107 | if (idx < s_idx) |
2108 | goto cont; | |
2109 | if (idx > s_idx) | |
2110 | memset(&cb->args[1], 0, | |
2111 | sizeof(cb->args) - sizeof(cb->args[0])); | |
84d7fce6 | 2112 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, |
96518518 PM |
2113 | cb->nlh->nlmsg_seq, |
2114 | NFT_MSG_NEWRULE, | |
2115 | NLM_F_MULTI | NLM_F_APPEND, | |
2116 | afi->family, table, chain, rule) < 0) | |
2117 | goto done; | |
38e029f1 PNA |
2118 | |
2119 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
2120 | cont: |
2121 | idx++; | |
2122 | } | |
2123 | } | |
2124 | } | |
2125 | } | |
2126 | done: | |
e688a7f8 PNA |
2127 | rcu_read_unlock(); |
2128 | ||
96518518 PM |
2129 | cb->args[0] = idx; |
2130 | return skb->len; | |
2131 | } | |
2132 | ||
6e1f760e PNA |
2133 | static int nf_tables_dump_rules_done(struct netlink_callback *cb) |
2134 | { | |
e46abbcc PS |
2135 | struct nft_rule_dump_ctx *ctx = cb->data; |
2136 | ||
2137 | if (ctx) { | |
2138 | kfree(ctx->table); | |
b7263e07 | 2139 | kfree(ctx->chain); |
e46abbcc PS |
2140 | kfree(ctx); |
2141 | } | |
6e1f760e PNA |
2142 | return 0; |
2143 | } | |
2144 | ||
7b8002a1 PNA |
2145 | static int nf_tables_getrule(struct net *net, struct sock *nlsk, |
2146 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2147 | const struct nlattr * const nla[], |
2148 | struct netlink_ext_ack *extack) | |
96518518 PM |
2149 | { |
2150 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2151 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
2152 | const struct nft_af_info *afi; |
2153 | const struct nft_table *table; | |
2154 | const struct nft_chain *chain; | |
2155 | const struct nft_rule *rule; | |
2156 | struct sk_buff *skb2; | |
2157 | int family = nfmsg->nfgen_family; | |
2158 | int err; | |
2159 | ||
2160 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2161 | struct netlink_dump_control c = { | |
2162 | .dump = nf_tables_dump_rules, | |
6e1f760e | 2163 | .done = nf_tables_dump_rules_done, |
96518518 | 2164 | }; |
6e1f760e PNA |
2165 | |
2166 | if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { | |
2167 | struct nft_rule_dump_ctx *ctx; | |
2168 | ||
2169 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
2170 | if (!ctx) | |
2171 | return -ENOMEM; | |
2172 | ||
e46abbcc PS |
2173 | if (nla[NFTA_RULE_TABLE]) { |
2174 | ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], | |
2175 | GFP_KERNEL); | |
2176 | if (!ctx->table) { | |
2177 | kfree(ctx); | |
2178 | return -ENOMEM; | |
2179 | } | |
2180 | } | |
b7263e07 PS |
2181 | if (nla[NFTA_RULE_CHAIN]) { |
2182 | ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], | |
2183 | GFP_KERNEL); | |
2184 | if (!ctx->chain) { | |
2185 | kfree(ctx->table); | |
2186 | kfree(ctx); | |
2187 | return -ENOMEM; | |
2188 | } | |
2189 | } | |
6e1f760e PNA |
2190 | c.data = ctx; |
2191 | } | |
2192 | ||
96518518 PM |
2193 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2194 | } | |
2195 | ||
99633ab2 | 2196 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2197 | if (IS_ERR(afi)) |
2198 | return PTR_ERR(afi); | |
2199 | ||
f2a6d766 | 2200 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2201 | if (IS_ERR(table)) |
2202 | return PTR_ERR(table); | |
2203 | ||
664b0f8c | 2204 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2205 | if (IS_ERR(chain)) |
2206 | return PTR_ERR(chain); | |
2207 | ||
2208 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
2209 | if (IS_ERR(rule)) | |
2210 | return PTR_ERR(rule); | |
2211 | ||
2212 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2213 | if (!skb2) | |
2214 | return -ENOMEM; | |
2215 | ||
84d7fce6 | 2216 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
2217 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
2218 | family, table, chain, rule); | |
2219 | if (err < 0) | |
2220 | goto err; | |
2221 | ||
2222 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2223 | ||
2224 | err: | |
2225 | kfree_skb(skb2); | |
2226 | return err; | |
2227 | } | |
2228 | ||
62472bce PM |
2229 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
2230 | struct nft_rule *rule) | |
96518518 | 2231 | { |
96518518 PM |
2232 | struct nft_expr *expr; |
2233 | ||
2234 | /* | |
2235 | * Careful: some expressions might not be initialized in case this | |
2236 | * is called on error from nf_tables_newrule(). | |
2237 | */ | |
2238 | expr = nft_expr_first(rule); | |
3e38df13 | 2239 | while (expr != nft_expr_last(rule) && expr->ops) { |
62472bce | 2240 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
2241 | expr = nft_expr_next(expr); |
2242 | } | |
2243 | kfree(rule); | |
2244 | } | |
2245 | ||
1081d11b PNA |
2246 | #define NFT_RULE_MAXEXPRS 128 |
2247 | ||
2248 | static struct nft_expr_info *info; | |
2249 | ||
633c9a84 PNA |
2250 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
2251 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2252 | const struct nlattr * const nla[], |
2253 | struct netlink_ext_ack *extack) | |
96518518 PM |
2254 | { |
2255 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2256 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2257 | struct nft_af_info *afi; |
96518518 PM |
2258 | struct nft_table *table; |
2259 | struct nft_chain *chain; | |
2260 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 2261 | struct nft_userdata *udata; |
1081d11b | 2262 | struct nft_trans *trans = NULL; |
96518518 PM |
2263 | struct nft_expr *expr; |
2264 | struct nft_ctx ctx; | |
2265 | struct nlattr *tmp; | |
86f1ec32 | 2266 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 PM |
2267 | int err, rem; |
2268 | bool create; | |
5e948466 | 2269 | u64 handle, pos_handle; |
96518518 PM |
2270 | |
2271 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
2272 | ||
99633ab2 | 2273 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
2274 | if (IS_ERR(afi)) |
2275 | return PTR_ERR(afi); | |
2276 | ||
f2a6d766 | 2277 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2278 | if (IS_ERR(table)) |
2279 | return PTR_ERR(table); | |
2280 | ||
664b0f8c | 2281 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2282 | if (IS_ERR(chain)) |
2283 | return PTR_ERR(chain); | |
2284 | ||
2285 | if (nla[NFTA_RULE_HANDLE]) { | |
2286 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
2287 | rule = __nf_tables_rule_lookup(chain, handle); | |
2288 | if (IS_ERR(rule)) | |
2289 | return PTR_ERR(rule); | |
2290 | ||
2291 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2292 | return -EEXIST; | |
2293 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2294 | old_rule = rule; | |
2295 | else | |
2296 | return -EOPNOTSUPP; | |
2297 | } else { | |
2298 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
2299 | return -EINVAL; | |
2300 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
2301 | |
2302 | if (chain->use == UINT_MAX) | |
2303 | return -EOVERFLOW; | |
96518518 PM |
2304 | } |
2305 | ||
5e948466 EL |
2306 | if (nla[NFTA_RULE_POSITION]) { |
2307 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2308 | return -EOPNOTSUPP; | |
2309 | ||
2310 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
2311 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
2312 | if (IS_ERR(old_rule)) | |
2313 | return PTR_ERR(old_rule); | |
2314 | } | |
2315 | ||
633c9a84 | 2316 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0ca743a5 | 2317 | |
96518518 PM |
2318 | n = 0; |
2319 | size = 0; | |
2320 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2321 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
2322 | err = -EINVAL; | |
2323 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2324 | goto err1; | |
2325 | if (n == NFT_RULE_MAXEXPRS) | |
2326 | goto err1; | |
0ca743a5 | 2327 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2328 | if (err < 0) |
2329 | goto err1; | |
2330 | size += info[n].ops->size; | |
2331 | n++; | |
2332 | } | |
2333 | } | |
9889840f PM |
2334 | /* Check for overflow of dlen field */ |
2335 | err = -EFBIG; | |
2336 | if (size >= 1 << 12) | |
2337 | goto err1; | |
96518518 | 2338 | |
86f1ec32 | 2339 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2340 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2341 | if (ulen > 0) |
2342 | usize = sizeof(struct nft_userdata) + ulen; | |
2343 | } | |
0768b3b3 | 2344 | |
96518518 | 2345 | err = -ENOMEM; |
86f1ec32 | 2346 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2347 | if (rule == NULL) |
2348 | goto err1; | |
2349 | ||
889f7ee7 | 2350 | nft_activate_next(net, rule); |
0628b123 | 2351 | |
96518518 PM |
2352 | rule->handle = handle; |
2353 | rule->dlen = size; | |
86f1ec32 | 2354 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2355 | |
86f1ec32 PM |
2356 | if (ulen) { |
2357 | udata = nft_userdata(rule); | |
2358 | udata->len = ulen - 1; | |
2359 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2360 | } | |
96518518 | 2361 | |
96518518 PM |
2362 | expr = nft_expr_first(rule); |
2363 | for (i = 0; i < n; i++) { | |
2364 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2365 | if (err < 0) | |
2366 | goto err2; | |
ef1f7df9 | 2367 | info[i].ops = NULL; |
96518518 PM |
2368 | expr = nft_expr_next(expr); |
2369 | } | |
2370 | ||
96518518 | 2371 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
889f7ee7 | 2372 | if (nft_is_active_next(net, old_rule)) { |
ac904ac8 | 2373 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
b380e5c7 | 2374 | old_rule); |
1081d11b | 2375 | if (trans == NULL) { |
0628b123 PNA |
2376 | err = -ENOMEM; |
2377 | goto err2; | |
2378 | } | |
889f7ee7 | 2379 | nft_deactivate_next(net, old_rule); |
ac34b861 | 2380 | chain->use--; |
5bc5c307 | 2381 | list_add_tail_rcu(&rule->list, &old_rule->list); |
0628b123 PNA |
2382 | } else { |
2383 | err = -ENOENT; | |
2384 | goto err2; | |
2385 | } | |
96518518 | 2386 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
2387 | if (old_rule) |
2388 | list_add_rcu(&rule->list, &old_rule->list); | |
2389 | else | |
2390 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2391 | else { | |
2392 | if (old_rule) | |
2393 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2394 | else | |
2395 | list_add_rcu(&rule->list, &chain->rules); | |
2396 | } | |
96518518 | 2397 | |
b380e5c7 | 2398 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
0628b123 PNA |
2399 | err = -ENOMEM; |
2400 | goto err3; | |
2401 | } | |
4fefee57 | 2402 | chain->use++; |
96518518 PM |
2403 | return 0; |
2404 | ||
0628b123 PNA |
2405 | err3: |
2406 | list_del_rcu(&rule->list); | |
96518518 | 2407 | err2: |
62472bce | 2408 | nf_tables_rule_destroy(&ctx, rule); |
96518518 PM |
2409 | err1: |
2410 | for (i = 0; i < n; i++) { | |
2411 | if (info[i].ops != NULL) | |
ef1f7df9 | 2412 | module_put(info[i].ops->type->owner); |
96518518 PM |
2413 | } |
2414 | return err; | |
2415 | } | |
2416 | ||
1a94e38d PNA |
2417 | static struct nft_rule *nft_rule_lookup_byid(const struct net *net, |
2418 | const struct nlattr *nla) | |
2419 | { | |
2420 | u32 id = ntohl(nla_get_be32(nla)); | |
2421 | struct nft_trans *trans; | |
2422 | ||
2423 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
2424 | struct nft_rule *rule = nft_trans_rule(trans); | |
2425 | ||
2426 | if (trans->msg_type == NFT_MSG_NEWRULE && | |
2427 | id == nft_trans_rule_id(trans)) | |
2428 | return rule; | |
2429 | } | |
2430 | return ERR_PTR(-ENOENT); | |
2431 | } | |
2432 | ||
633c9a84 PNA |
2433 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
2434 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2435 | const struct nlattr * const nla[], |
2436 | struct netlink_ext_ack *extack) | |
96518518 PM |
2437 | { |
2438 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2439 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2440 | struct nft_af_info *afi; |
7c95f6d8 | 2441 | struct nft_table *table; |
cf9dc09d PNA |
2442 | struct nft_chain *chain = NULL; |
2443 | struct nft_rule *rule; | |
0628b123 PNA |
2444 | int family = nfmsg->nfgen_family, err = 0; |
2445 | struct nft_ctx ctx; | |
96518518 | 2446 | |
99633ab2 | 2447 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
2448 | if (IS_ERR(afi)) |
2449 | return PTR_ERR(afi); | |
2450 | ||
f2a6d766 | 2451 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask); |
96518518 PM |
2452 | if (IS_ERR(table)) |
2453 | return PTR_ERR(table); | |
2454 | ||
cf9dc09d | 2455 | if (nla[NFTA_RULE_CHAIN]) { |
664b0f8c PNA |
2456 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], |
2457 | genmask); | |
cf9dc09d PNA |
2458 | if (IS_ERR(chain)) |
2459 | return PTR_ERR(chain); | |
2460 | } | |
96518518 | 2461 | |
633c9a84 | 2462 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla); |
0628b123 | 2463 | |
cf9dc09d PNA |
2464 | if (chain) { |
2465 | if (nla[NFTA_RULE_HANDLE]) { | |
2466 | rule = nf_tables_rule_lookup(chain, | |
2467 | nla[NFTA_RULE_HANDLE]); | |
2468 | if (IS_ERR(rule)) | |
2469 | return PTR_ERR(rule); | |
96518518 | 2470 | |
1a94e38d PNA |
2471 | err = nft_delrule(&ctx, rule); |
2472 | } else if (nla[NFTA_RULE_ID]) { | |
2473 | rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]); | |
2474 | if (IS_ERR(rule)) | |
2475 | return PTR_ERR(rule); | |
2476 | ||
5e266fe7 | 2477 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2478 | } else { |
ce24b721 | 2479 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2480 | } |
2481 | } else { | |
2482 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
2483 | if (!nft_is_active_next(net, chain)) |
2484 | continue; | |
2485 | ||
cf9dc09d | 2486 | ctx.chain = chain; |
ce24b721 | 2487 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2488 | if (err < 0) |
2489 | break; | |
2490 | } | |
2491 | } | |
2492 | ||
2493 | return err; | |
2494 | } | |
2495 | ||
20a69341 PM |
2496 | /* |
2497 | * Sets | |
2498 | */ | |
2499 | ||
2b664957 | 2500 | static LIST_HEAD(nf_tables_set_types); |
20a69341 | 2501 | |
2b664957 | 2502 | int nft_register_set(struct nft_set_type *type) |
20a69341 PM |
2503 | { |
2504 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2505 | list_add_tail_rcu(&type->list, &nf_tables_set_types); |
20a69341 PM |
2506 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2507 | return 0; | |
2508 | } | |
2509 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2510 | ||
2b664957 | 2511 | void nft_unregister_set(struct nft_set_type *type) |
20a69341 PM |
2512 | { |
2513 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2514 | list_del_rcu(&type->list); |
20a69341 PM |
2515 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2516 | } | |
2517 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2518 | ||
2b664957 PNA |
2519 | #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ |
2520 | NFT_SET_TIMEOUT | NFT_SET_OBJECT) | |
2521 | ||
2522 | static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags) | |
2523 | { | |
2524 | return (flags & ops->features) == (flags & NFT_SET_FEATURES); | |
2525 | } | |
2526 | ||
c50b960c PM |
2527 | /* |
2528 | * Select a set implementation based on the data characteristics and the | |
2529 | * given policy. The total memory use might not be known if no size is | |
2530 | * given, in that case the amount of memory per element is used. | |
2531 | */ | |
2532 | static const struct nft_set_ops * | |
2b664957 PNA |
2533 | nft_select_set_ops(const struct nft_ctx *ctx, |
2534 | const struct nlattr * const nla[], | |
c50b960c PM |
2535 | const struct nft_set_desc *desc, |
2536 | enum nft_set_policies policy) | |
20a69341 | 2537 | { |
c50b960c PM |
2538 | const struct nft_set_ops *ops, *bops; |
2539 | struct nft_set_estimate est, best; | |
2b664957 PNA |
2540 | const struct nft_set_type *type; |
2541 | u32 flags = 0; | |
20a69341 PM |
2542 | |
2543 | #ifdef CONFIG_MODULES | |
2b664957 | 2544 | if (list_empty(&nf_tables_set_types)) { |
20a69341 PM |
2545 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2546 | request_module("nft-set"); | |
2547 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2548 | if (!list_empty(&nf_tables_set_types)) |
20a69341 PM |
2549 | return ERR_PTR(-EAGAIN); |
2550 | } | |
2551 | #endif | |
2b664957 PNA |
2552 | if (nla[NFTA_SET_FLAGS] != NULL) |
2553 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
20a69341 | 2554 | |
55af753c PNA |
2555 | bops = NULL; |
2556 | best.size = ~0; | |
2557 | best.lookup = ~0; | |
0b5a7874 | 2558 | best.space = ~0; |
c50b960c | 2559 | |
2b664957 PNA |
2560 | list_for_each_entry(type, &nf_tables_set_types, list) { |
2561 | if (!type->select_ops) | |
2562 | ops = type->ops; | |
2563 | else | |
2564 | ops = type->select_ops(ctx, desc, flags); | |
2565 | if (!ops) | |
2566 | continue; | |
2567 | ||
2568 | if (!nft_set_ops_candidate(ops, flags)) | |
20a69341 | 2569 | continue; |
2b664957 | 2570 | if (!ops->estimate(desc, flags, &est)) |
c50b960c PM |
2571 | continue; |
2572 | ||
2573 | switch (policy) { | |
2574 | case NFT_SET_POL_PERFORMANCE: | |
55af753c | 2575 | if (est.lookup < best.lookup) |
c50b960c | 2576 | break; |
644e334e PNA |
2577 | if (est.lookup == best.lookup && |
2578 | est.space < best.space) | |
2579 | break; | |
c50b960c PM |
2580 | continue; |
2581 | case NFT_SET_POL_MEMORY: | |
0b5a7874 PNA |
2582 | if (!desc->size) { |
2583 | if (est.space < best.space) | |
2584 | break; | |
2585 | if (est.space == best.space && | |
2586 | est.lookup < best.lookup) | |
2587 | break; | |
2588 | } else if (est.size < best.size) { | |
c50b960c | 2589 | break; |
0b5a7874 | 2590 | } |
c50b960c PM |
2591 | continue; |
2592 | default: | |
2593 | break; | |
2594 | } | |
2595 | ||
2b664957 | 2596 | if (!try_module_get(type->owner)) |
20a69341 | 2597 | continue; |
c50b960c | 2598 | if (bops != NULL) |
2b664957 | 2599 | module_put(bops->type->owner); |
c50b960c PM |
2600 | |
2601 | bops = ops; | |
2602 | best = est; | |
20a69341 PM |
2603 | } |
2604 | ||
c50b960c PM |
2605 | if (bops != NULL) |
2606 | return bops; | |
2607 | ||
20a69341 PM |
2608 | return ERR_PTR(-EOPNOTSUPP); |
2609 | } | |
2610 | ||
2611 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
b2fbd044 LZ |
2612 | [NFTA_SET_TABLE] = { .type = NLA_STRING, |
2613 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
a9bdd836 | 2614 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
cb39ad8b | 2615 | .len = NFT_SET_MAXNAMELEN - 1 }, |
20a69341 PM |
2616 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2617 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2618 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2619 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2620 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2621 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2622 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2623 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2624 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2625 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
e6d8ecac CFG |
2626 | [NFTA_SET_USERDATA] = { .type = NLA_BINARY, |
2627 | .len = NFT_USERDATA_MAXLEN }, | |
8aeff920 | 2628 | [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, |
c50b960c PM |
2629 | }; |
2630 | ||
2631 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2632 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2633 | }; |
2634 | ||
633c9a84 | 2635 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
2636 | const struct sk_buff *skb, |
2637 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
2638 | const struct nlattr * const nla[], |
2639 | u8 genmask) | |
20a69341 PM |
2640 | { |
2641 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
2642 | struct nft_af_info *afi = NULL; |
2643 | struct nft_table *table = NULL; | |
20a69341 | 2644 | |
c9c8e485 PNA |
2645 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
2646 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
2647 | if (IS_ERR(afi)) | |
2648 | return PTR_ERR(afi); | |
2649 | } | |
20a69341 PM |
2650 | |
2651 | if (nla[NFTA_SET_TABLE] != NULL) { | |
ec2c9935 PM |
2652 | if (afi == NULL) |
2653 | return -EAFNOSUPPORT; | |
2654 | ||
f2a6d766 PNA |
2655 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], |
2656 | genmask); | |
20a69341 PM |
2657 | if (IS_ERR(table)) |
2658 | return PTR_ERR(table); | |
2659 | } | |
2660 | ||
633c9a84 | 2661 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2662 | return 0; |
2663 | } | |
2664 | ||
c7a72e3f PNA |
2665 | static struct nft_set *nf_tables_set_lookup(const struct nft_table *table, |
2666 | const struct nlattr *nla, u8 genmask) | |
20a69341 PM |
2667 | { |
2668 | struct nft_set *set; | |
2669 | ||
2670 | if (nla == NULL) | |
2671 | return ERR_PTR(-EINVAL); | |
2672 | ||
2673 | list_for_each_entry(set, &table->sets, list) { | |
37a9cc52 PNA |
2674 | if (!nla_strcmp(nla, set->name) && |
2675 | nft_active_genmask(set, genmask)) | |
20a69341 PM |
2676 | return set; |
2677 | } | |
2678 | return ERR_PTR(-ENOENT); | |
2679 | } | |
2680 | ||
c7a72e3f PNA |
2681 | static struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
2682 | const struct nlattr *nla, | |
2683 | u8 genmask) | |
958bee14 PNA |
2684 | { |
2685 | struct nft_trans *trans; | |
2686 | u32 id = ntohl(nla_get_be32(nla)); | |
2687 | ||
2688 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
37a9cc52 PNA |
2689 | struct nft_set *set = nft_trans_set(trans); |
2690 | ||
958bee14 | 2691 | if (trans->msg_type == NFT_MSG_NEWSET && |
37a9cc52 PNA |
2692 | id == nft_trans_set_id(trans) && |
2693 | nft_active_genmask(set, genmask)) | |
2694 | return set; | |
958bee14 PNA |
2695 | } |
2696 | return ERR_PTR(-ENOENT); | |
2697 | } | |
c7a72e3f PNA |
2698 | |
2699 | struct nft_set *nft_set_lookup(const struct net *net, | |
2700 | const struct nft_table *table, | |
2701 | const struct nlattr *nla_set_name, | |
2702 | const struct nlattr *nla_set_id, | |
2703 | u8 genmask) | |
2704 | { | |
2705 | struct nft_set *set; | |
2706 | ||
2707 | set = nf_tables_set_lookup(table, nla_set_name, genmask); | |
2708 | if (IS_ERR(set)) { | |
2709 | if (!nla_set_id) | |
2710 | return set; | |
2711 | ||
2712 | set = nf_tables_set_lookup_byid(net, nla_set_id, genmask); | |
2713 | } | |
2714 | return set; | |
2715 | } | |
2716 | EXPORT_SYMBOL_GPL(nft_set_lookup); | |
958bee14 | 2717 | |
20a69341 PM |
2718 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
2719 | const char *name) | |
2720 | { | |
2721 | const struct nft_set *i; | |
2722 | const char *p; | |
2723 | unsigned long *inuse; | |
60eb1894 | 2724 | unsigned int n = 0, min = 0; |
20a69341 | 2725 | |
38745490 | 2726 | p = strchr(name, '%'); |
20a69341 PM |
2727 | if (p != NULL) { |
2728 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2729 | return -EINVAL; | |
2730 | ||
2731 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2732 | if (inuse == NULL) | |
2733 | return -ENOMEM; | |
60eb1894 | 2734 | cont: |
20a69341 | 2735 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2736 | int tmp; |
2737 | ||
37a9cc52 PNA |
2738 | if (!nft_is_active_next(ctx->net, set)) |
2739 | continue; | |
14662917 | 2740 | if (!sscanf(i->name, name, &tmp)) |
20a69341 | 2741 | continue; |
60eb1894 | 2742 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2743 | continue; |
14662917 | 2744 | |
60eb1894 | 2745 | set_bit(tmp - min, inuse); |
20a69341 PM |
2746 | } |
2747 | ||
53b70287 | 2748 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2749 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2750 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2751 | memset(inuse, 0, PAGE_SIZE); | |
2752 | goto cont; | |
2753 | } | |
20a69341 PM |
2754 | free_page((unsigned long)inuse); |
2755 | } | |
2756 | ||
38745490 PS |
2757 | set->name = kasprintf(GFP_KERNEL, name, min + n); |
2758 | if (!set->name) | |
2759 | return -ENOMEM; | |
2760 | ||
20a69341 | 2761 | list_for_each_entry(i, &ctx->table->sets, list) { |
37a9cc52 PNA |
2762 | if (!nft_is_active_next(ctx->net, i)) |
2763 | continue; | |
e63aaaa6 AY |
2764 | if (!strcmp(set->name, i->name)) { |
2765 | kfree(set->name); | |
20a69341 | 2766 | return -ENFILE; |
e63aaaa6 | 2767 | } |
20a69341 PM |
2768 | } |
2769 | return 0; | |
2770 | } | |
2771 | ||
2772 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2773 | const struct nft_set *set, u16 event, u16 flags) | |
2774 | { | |
2775 | struct nfgenmsg *nfmsg; | |
2776 | struct nlmsghdr *nlh; | |
c50b960c | 2777 | struct nlattr *desc; |
128ad332 PNA |
2778 | u32 portid = ctx->portid; |
2779 | u32 seq = ctx->seq; | |
20a69341 | 2780 | |
dedb67c4 | 2781 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
20a69341 PM |
2782 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
2783 | flags); | |
2784 | if (nlh == NULL) | |
2785 | goto nla_put_failure; | |
2786 | ||
2787 | nfmsg = nlmsg_data(nlh); | |
2788 | nfmsg->nfgen_family = ctx->afi->family; | |
2789 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2790 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
2791 | |
2792 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2793 | goto nla_put_failure; | |
2794 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2795 | goto nla_put_failure; | |
2796 | if (set->flags != 0) | |
2797 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2798 | goto nla_put_failure; | |
2799 | ||
2800 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2801 | goto nla_put_failure; | |
2802 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2803 | goto nla_put_failure; | |
2804 | if (set->flags & NFT_SET_MAP) { | |
2805 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2806 | goto nla_put_failure; | |
2807 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2808 | goto nla_put_failure; | |
2809 | } | |
8aeff920 PNA |
2810 | if (set->flags & NFT_SET_OBJECT && |
2811 | nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) | |
2812 | goto nla_put_failure; | |
20a69341 | 2813 | |
761da293 | 2814 | if (set->timeout && |
d3e2a111 AP |
2815 | nla_put_be64(skb, NFTA_SET_TIMEOUT, |
2816 | cpu_to_be64(jiffies_to_msecs(set->timeout)), | |
b46f6ded | 2817 | NFTA_SET_PAD)) |
761da293 PM |
2818 | goto nla_put_failure; |
2819 | if (set->gc_int && | |
2820 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
2821 | goto nla_put_failure; | |
2822 | ||
9363dc4b AB |
2823 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
2824 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
2825 | goto nla_put_failure; | |
2826 | } | |
2827 | ||
e6d8ecac CFG |
2828 | if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) |
2829 | goto nla_put_failure; | |
2830 | ||
c50b960c PM |
2831 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
2832 | if (desc == NULL) | |
2833 | goto nla_put_failure; | |
2834 | if (set->size && | |
2835 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
2836 | goto nla_put_failure; | |
2837 | nla_nest_end(skb, desc); | |
2838 | ||
053c095a JB |
2839 | nlmsg_end(skb, nlh); |
2840 | return 0; | |
20a69341 PM |
2841 | |
2842 | nla_put_failure: | |
2843 | nlmsg_trim(skb, nlh); | |
2844 | return -1; | |
2845 | } | |
2846 | ||
25e94a99 PNA |
2847 | static void nf_tables_set_notify(const struct nft_ctx *ctx, |
2848 | const struct nft_set *set, int event, | |
2849 | gfp_t gfp_flags) | |
20a69341 PM |
2850 | { |
2851 | struct sk_buff *skb; | |
128ad332 | 2852 | u32 portid = ctx->portid; |
20a69341 PM |
2853 | int err; |
2854 | ||
128ad332 PNA |
2855 | if (!ctx->report && |
2856 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 2857 | return; |
20a69341 | 2858 | |
31f8441c | 2859 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
2860 | if (skb == NULL) |
2861 | goto err; | |
2862 | ||
2863 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2864 | if (err < 0) { | |
2865 | kfree_skb(skb); | |
2866 | goto err; | |
2867 | } | |
2868 | ||
25e94a99 PNA |
2869 | nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report, |
2870 | gfp_flags); | |
2871 | return; | |
20a69341 | 2872 | err: |
25e94a99 | 2873 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
20a69341 PM |
2874 | } |
2875 | ||
5b96af77 | 2876 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
2877 | { |
2878 | const struct nft_set *set; | |
2879 | unsigned int idx, s_idx = cb->args[0]; | |
7c95f6d8 | 2880 | struct nft_af_info *afi; |
c9c8e485 PNA |
2881 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2882 | struct net *net = sock_net(skb->sk); | |
2883 | int cur_family = cb->args[3]; | |
5b96af77 | 2884 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
2885 | |
2886 | if (cb->args[1]) | |
2887 | return skb->len; | |
2888 | ||
e688a7f8 | 2889 | rcu_read_lock(); |
38e029f1 PNA |
2890 | cb->seq = net->nft.base_seq; |
2891 | ||
e688a7f8 | 2892 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
5b96af77 PNA |
2893 | if (ctx->afi && ctx->afi != afi) |
2894 | continue; | |
2895 | ||
c9c8e485 PNA |
2896 | if (cur_family) { |
2897 | if (afi->family != cur_family) | |
2898 | continue; | |
2899 | ||
2900 | cur_family = 0; | |
2901 | } | |
e688a7f8 | 2902 | list_for_each_entry_rcu(table, &afi->tables, list) { |
5b96af77 PNA |
2903 | if (ctx->table && ctx->table != table) |
2904 | continue; | |
2905 | ||
c9c8e485 PNA |
2906 | if (cur_table) { |
2907 | if (cur_table != table) | |
2908 | continue; | |
2909 | ||
2910 | cur_table = NULL; | |
2911 | } | |
c9c8e485 | 2912 | idx = 0; |
5b96af77 | 2913 | list_for_each_entry_rcu(set, &table->sets, list) { |
c9c8e485 PNA |
2914 | if (idx < s_idx) |
2915 | goto cont; | |
37a9cc52 PNA |
2916 | if (!nft_is_active(net, set)) |
2917 | goto cont; | |
5b96af77 PNA |
2918 | |
2919 | ctx_set = *ctx; | |
2920 | ctx_set.table = table; | |
2921 | ctx_set.afi = afi; | |
2922 | if (nf_tables_fill_set(skb, &ctx_set, set, | |
c9c8e485 PNA |
2923 | NFT_MSG_NEWSET, |
2924 | NLM_F_MULTI) < 0) { | |
2925 | cb->args[0] = idx; | |
2926 | cb->args[2] = (unsigned long) table; | |
2927 | cb->args[3] = afi->family; | |
2928 | goto done; | |
2929 | } | |
38e029f1 | 2930 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 PNA |
2931 | cont: |
2932 | idx++; | |
2933 | } | |
2934 | if (s_idx) | |
2935 | s_idx = 0; | |
2936 | } | |
2937 | } | |
2938 | cb->args[1] = 1; | |
2939 | done: | |
e688a7f8 | 2940 | rcu_read_unlock(); |
c9c8e485 PNA |
2941 | return skb->len; |
2942 | } | |
2943 | ||
5b96af77 | 2944 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 2945 | { |
5b96af77 PNA |
2946 | kfree(cb->data); |
2947 | return 0; | |
20a69341 PM |
2948 | } |
2949 | ||
7b8002a1 PNA |
2950 | static int nf_tables_getset(struct net *net, struct sock *nlsk, |
2951 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2952 | const struct nlattr * const nla[], |
2953 | struct netlink_ext_ack *extack) | |
20a69341 | 2954 | { |
f2a6d766 | 2955 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
2956 | const struct nft_set *set; |
2957 | struct nft_ctx ctx; | |
2958 | struct sk_buff *skb2; | |
c9c8e485 | 2959 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2960 | int err; |
2961 | ||
01cfa0a4 | 2962 | /* Verify existence before starting dump */ |
f2a6d766 | 2963 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
2964 | if (err < 0) |
2965 | return err; | |
2966 | ||
2967 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2968 | struct netlink_dump_control c = { | |
2969 | .dump = nf_tables_dump_sets, | |
5b96af77 | 2970 | .done = nf_tables_dump_sets_done, |
20a69341 | 2971 | }; |
5b96af77 PNA |
2972 | struct nft_ctx *ctx_dump; |
2973 | ||
2974 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); | |
2975 | if (ctx_dump == NULL) | |
2976 | return -ENOMEM; | |
2977 | ||
2978 | *ctx_dump = ctx; | |
2979 | c.data = ctx_dump; | |
2980 | ||
20a69341 PM |
2981 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2982 | } | |
2983 | ||
c9c8e485 PNA |
2984 | /* Only accept unspec with dump */ |
2985 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2986 | return -EAFNOSUPPORT; | |
eaa2bcd6 PT |
2987 | if (!nla[NFTA_SET_TABLE]) |
2988 | return -EINVAL; | |
c9c8e485 | 2989 | |
37a9cc52 | 2990 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
2991 | if (IS_ERR(set)) |
2992 | return PTR_ERR(set); | |
2993 | ||
2994 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2995 | if (skb2 == NULL) | |
2996 | return -ENOMEM; | |
2997 | ||
2998 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2999 | if (err < 0) | |
3000 | goto err; | |
3001 | ||
3002 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
3003 | ||
3004 | err: | |
3005 | kfree_skb(skb2); | |
3006 | return err; | |
3007 | } | |
3008 | ||
c50b960c PM |
3009 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
3010 | struct nft_set_desc *desc, | |
3011 | const struct nlattr *nla) | |
3012 | { | |
3013 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
3014 | int err; | |
3015 | ||
fceb6435 JB |
3016 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, |
3017 | nft_set_desc_policy, NULL); | |
c50b960c PM |
3018 | if (err < 0) |
3019 | return err; | |
3020 | ||
3021 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
3022 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
3023 | ||
3024 | return 0; | |
3025 | } | |
3026 | ||
633c9a84 PNA |
3027 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
3028 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3029 | const struct nlattr * const nla[], |
3030 | struct netlink_ext_ack *extack) | |
20a69341 PM |
3031 | { |
3032 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 3033 | u8 genmask = nft_genmask_next(net); |
20a69341 | 3034 | const struct nft_set_ops *ops; |
7c95f6d8 | 3035 | struct nft_af_info *afi; |
20a69341 PM |
3036 | struct nft_table *table; |
3037 | struct nft_set *set; | |
3038 | struct nft_ctx ctx; | |
38745490 | 3039 | char *name; |
20a69341 PM |
3040 | unsigned int size; |
3041 | bool create; | |
761da293 | 3042 | u64 timeout; |
8aeff920 | 3043 | u32 ktype, dtype, flags, policy, gc_int, objtype; |
c50b960c | 3044 | struct nft_set_desc desc; |
e6d8ecac CFG |
3045 | unsigned char *udata; |
3046 | u16 udlen; | |
20a69341 PM |
3047 | int err; |
3048 | ||
3049 | if (nla[NFTA_SET_TABLE] == NULL || | |
3050 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
3051 | nla[NFTA_SET_KEY_LEN] == NULL || |
3052 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
3053 | return -EINVAL; |
3054 | ||
c50b960c PM |
3055 | memset(&desc, 0, sizeof(desc)); |
3056 | ||
20a69341 PM |
3057 | ktype = NFT_DATA_VALUE; |
3058 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
3059 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
3060 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
3061 | return -EINVAL; | |
3062 | } | |
3063 | ||
c50b960c | 3064 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 3065 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3066 | return -EINVAL; |
3067 | ||
3068 | flags = 0; | |
3069 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
3070 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
3071 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 | 3072 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
8aeff920 PNA |
3073 | NFT_SET_MAP | NFT_SET_EVAL | |
3074 | NFT_SET_OBJECT)) | |
20a69341 | 3075 | return -EINVAL; |
8aeff920 PNA |
3076 | /* Only one of these operations is supported */ |
3077 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) == | |
3078 | (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) | |
7c6c6e95 | 3079 | return -EOPNOTSUPP; |
20a69341 PM |
3080 | } |
3081 | ||
3082 | dtype = 0; | |
20a69341 PM |
3083 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
3084 | if (!(flags & NFT_SET_MAP)) | |
3085 | return -EINVAL; | |
3086 | ||
3087 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
3088 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
3089 | dtype != NFT_DATA_VERDICT) | |
3090 | return -EINVAL; | |
3091 | ||
3092 | if (dtype != NFT_DATA_VERDICT) { | |
3093 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
3094 | return -EINVAL; | |
c50b960c | 3095 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 3096 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3097 | return -EINVAL; |
3098 | } else | |
7d740264 | 3099 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
3100 | } else if (flags & NFT_SET_MAP) |
3101 | return -EINVAL; | |
3102 | ||
8aeff920 PNA |
3103 | if (nla[NFTA_SET_OBJ_TYPE] != NULL) { |
3104 | if (!(flags & NFT_SET_OBJECT)) | |
3105 | return -EINVAL; | |
3106 | ||
3107 | objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); | |
3108 | if (objtype == NFT_OBJECT_UNSPEC || | |
3109 | objtype > NFT_OBJECT_MAX) | |
3110 | return -EINVAL; | |
3111 | } else if (flags & NFT_SET_OBJECT) | |
3112 | return -EINVAL; | |
3113 | else | |
3114 | objtype = NFT_OBJECT_UNSPEC; | |
3115 | ||
761da293 PM |
3116 | timeout = 0; |
3117 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
3118 | if (!(flags & NFT_SET_TIMEOUT)) | |
3119 | return -EINVAL; | |
d3e2a111 AP |
3120 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3121 | nla[NFTA_SET_TIMEOUT]))); | |
761da293 PM |
3122 | } |
3123 | gc_int = 0; | |
3124 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
3125 | if (!(flags & NFT_SET_TIMEOUT)) | |
3126 | return -EINVAL; | |
3127 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
3128 | } | |
3129 | ||
c50b960c PM |
3130 | policy = NFT_SET_POL_PERFORMANCE; |
3131 | if (nla[NFTA_SET_POLICY] != NULL) | |
3132 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
3133 | ||
3134 | if (nla[NFTA_SET_DESC] != NULL) { | |
3135 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
3136 | if (err < 0) | |
3137 | return err; | |
3138 | } | |
3139 | ||
20a69341 PM |
3140 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
3141 | ||
99633ab2 | 3142 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
3143 | if (IS_ERR(afi)) |
3144 | return PTR_ERR(afi); | |
3145 | ||
f2a6d766 | 3146 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask); |
20a69341 PM |
3147 | if (IS_ERR(table)) |
3148 | return PTR_ERR(table); | |
3149 | ||
633c9a84 | 3150 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 | 3151 | |
37a9cc52 | 3152 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3153 | if (IS_ERR(set)) { |
3154 | if (PTR_ERR(set) != -ENOENT) | |
3155 | return PTR_ERR(set); | |
1a28ad74 | 3156 | } else { |
20a69341 PM |
3157 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
3158 | return -EEXIST; | |
3159 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
3160 | return -EOPNOTSUPP; | |
3161 | return 0; | |
3162 | } | |
3163 | ||
3164 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
3165 | return -ENOENT; | |
3166 | ||
2b664957 | 3167 | ops = nft_select_set_ops(&ctx, nla, &desc, policy); |
20a69341 PM |
3168 | if (IS_ERR(ops)) |
3169 | return PTR_ERR(ops); | |
3170 | ||
e6d8ecac CFG |
3171 | udlen = 0; |
3172 | if (nla[NFTA_SET_USERDATA]) | |
3173 | udlen = nla_len(nla[NFTA_SET_USERDATA]); | |
3174 | ||
20a69341 PM |
3175 | size = 0; |
3176 | if (ops->privsize != NULL) | |
347b408d | 3177 | size = ops->privsize(nla, &desc); |
20a69341 | 3178 | |
1ff75a3e PNA |
3179 | set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); |
3180 | if (!set) { | |
3181 | err = -ENOMEM; | |
20a69341 | 3182 | goto err1; |
1ff75a3e | 3183 | } |
20a69341 | 3184 | |
38745490 PS |
3185 | name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL); |
3186 | if (!name) { | |
3187 | err = -ENOMEM; | |
3188 | goto err2; | |
3189 | } | |
3190 | ||
20a69341 | 3191 | err = nf_tables_set_alloc_name(&ctx, set, name); |
38745490 | 3192 | kfree(name); |
20a69341 PM |
3193 | if (err < 0) |
3194 | goto err2; | |
3195 | ||
e6d8ecac CFG |
3196 | udata = NULL; |
3197 | if (udlen) { | |
3198 | udata = set->data + size; | |
3199 | nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); | |
3200 | } | |
3201 | ||
20a69341 PM |
3202 | INIT_LIST_HEAD(&set->bindings); |
3203 | set->ops = ops; | |
3204 | set->ktype = ktype; | |
c50b960c | 3205 | set->klen = desc.klen; |
20a69341 | 3206 | set->dtype = dtype; |
8aeff920 | 3207 | set->objtype = objtype; |
c50b960c | 3208 | set->dlen = desc.dlen; |
20a69341 | 3209 | set->flags = flags; |
c50b960c | 3210 | set->size = desc.size; |
9363dc4b | 3211 | set->policy = policy; |
e6d8ecac CFG |
3212 | set->udlen = udlen; |
3213 | set->udata = udata; | |
761da293 PM |
3214 | set->timeout = timeout; |
3215 | set->gc_int = gc_int; | |
20a69341 | 3216 | |
c50b960c | 3217 | err = ops->init(set, &desc, nla); |
20a69341 PM |
3218 | if (err < 0) |
3219 | goto err2; | |
3220 | ||
958bee14 | 3221 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 | 3222 | if (err < 0) |
c17c3cdf | 3223 | goto err3; |
20a69341 | 3224 | |
e688a7f8 | 3225 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 3226 | table->use++; |
20a69341 PM |
3227 | return 0; |
3228 | ||
c17c3cdf LZ |
3229 | err3: |
3230 | ops->destroy(set); | |
20a69341 | 3231 | err2: |
1ff75a3e | 3232 | kvfree(set); |
20a69341 | 3233 | err1: |
2b664957 | 3234 | module_put(ops->type->owner); |
20a69341 PM |
3235 | return err; |
3236 | } | |
3237 | ||
958bee14 | 3238 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 3239 | { |
20a69341 | 3240 | set->ops->destroy(set); |
2b664957 | 3241 | module_put(set->ops->type->owner); |
38745490 | 3242 | kfree(set->name); |
1ff75a3e | 3243 | kvfree(set); |
20a69341 PM |
3244 | } |
3245 | ||
958bee14 PNA |
3246 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
3247 | { | |
e688a7f8 | 3248 | list_del_rcu(&set->list); |
31f8441c | 3249 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
3250 | nft_set_destroy(set); |
3251 | } | |
3252 | ||
633c9a84 PNA |
3253 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
3254 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3255 | const struct nlattr * const nla[], |
3256 | struct netlink_ext_ack *extack) | |
20a69341 | 3257 | { |
c9c8e485 | 3258 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
f2a6d766 | 3259 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3260 | struct nft_set *set; |
3261 | struct nft_ctx ctx; | |
3262 | int err; | |
3263 | ||
ec2c9935 PM |
3264 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
3265 | return -EAFNOSUPPORT; | |
20a69341 PM |
3266 | if (nla[NFTA_SET_TABLE] == NULL) |
3267 | return -EINVAL; | |
3268 | ||
f2a6d766 | 3269 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3270 | if (err < 0) |
3271 | return err; | |
3272 | ||
37a9cc52 | 3273 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3274 | if (IS_ERR(set)) |
3275 | return PTR_ERR(set); | |
a8278400 PNA |
3276 | |
3277 | if (!list_empty(&set->bindings) || | |
3278 | (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) | |
20a69341 PM |
3279 | return -EBUSY; |
3280 | ||
ee01d542 | 3281 | return nft_delset(&ctx, set); |
20a69341 PM |
3282 | } |
3283 | ||
3284 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 3285 | struct nft_set *set, |
20a69341 | 3286 | const struct nft_set_iter *iter, |
de70185d | 3287 | struct nft_set_elem *elem) |
20a69341 | 3288 | { |
fe2811eb | 3289 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3290 | enum nft_registers dreg; |
3291 | ||
3292 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
3293 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
3294 | set->dtype == NFT_DATA_VERDICT ? | |
3295 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
3296 | set->dlen); | |
20a69341 PM |
3297 | } |
3298 | ||
3299 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3300 | struct nft_set_binding *binding) | |
3301 | { | |
3302 | struct nft_set_binding *i; | |
3303 | struct nft_set_iter iter; | |
3304 | ||
408070d6 | 3305 | if (!list_empty(&set->bindings) && nft_set_is_anonymous(set)) |
20a69341 PM |
3306 | return -EBUSY; |
3307 | ||
11113e19 | 3308 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
3309 | /* If the set is already bound to the same chain all |
3310 | * jumps are already validated for that chain. | |
3311 | */ | |
3312 | list_for_each_entry(i, &set->bindings, list) { | |
a4684402 | 3313 | if (i->flags & NFT_SET_MAP && |
11113e19 | 3314 | i->chain == binding->chain) |
20a69341 PM |
3315 | goto bind; |
3316 | } | |
3317 | ||
8588ac09 | 3318 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
3319 | iter.skip = 0; |
3320 | iter.count = 0; | |
3321 | iter.err = 0; | |
3322 | iter.fn = nf_tables_bind_check_setelem; | |
3323 | ||
3324 | set->ops->walk(ctx, set, &iter); | |
a02f4248 | 3325 | if (iter.err < 0) |
20a69341 | 3326 | return iter.err; |
20a69341 PM |
3327 | } |
3328 | bind: | |
3329 | binding->chain = ctx->chain; | |
e688a7f8 | 3330 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
3331 | return 0; |
3332 | } | |
63aea290 | 3333 | EXPORT_SYMBOL_GPL(nf_tables_bind_set); |
20a69341 PM |
3334 | |
3335 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3336 | struct nft_set_binding *binding) | |
3337 | { | |
e688a7f8 | 3338 | list_del_rcu(&binding->list); |
20a69341 | 3339 | |
408070d6 | 3340 | if (list_empty(&set->bindings) && nft_set_is_anonymous(set) && |
37a9cc52 | 3341 | nft_is_active(ctx->net, set)) |
20a69341 PM |
3342 | nf_tables_set_destroy(ctx, set); |
3343 | } | |
63aea290 | 3344 | EXPORT_SYMBOL_GPL(nf_tables_unbind_set); |
20a69341 | 3345 | |
3ac4c07a PM |
3346 | const struct nft_set_ext_type nft_set_ext_types[] = { |
3347 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 3348 | .align = __alignof__(u32), |
3ac4c07a PM |
3349 | }, |
3350 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 3351 | .align = __alignof__(u32), |
3ac4c07a | 3352 | }, |
f25ad2e9 PM |
3353 | [NFT_SET_EXT_EXPR] = { |
3354 | .align = __alignof__(struct nft_expr), | |
3355 | }, | |
8aeff920 PNA |
3356 | [NFT_SET_EXT_OBJREF] = { |
3357 | .len = sizeof(struct nft_object *), | |
3358 | .align = __alignof__(struct nft_object *), | |
3359 | }, | |
3ac4c07a PM |
3360 | [NFT_SET_EXT_FLAGS] = { |
3361 | .len = sizeof(u8), | |
3362 | .align = __alignof__(u8), | |
3363 | }, | |
c3e1b005 PM |
3364 | [NFT_SET_EXT_TIMEOUT] = { |
3365 | .len = sizeof(u64), | |
3366 | .align = __alignof__(u64), | |
3367 | }, | |
3368 | [NFT_SET_EXT_EXPIRATION] = { | |
3369 | .len = sizeof(unsigned long), | |
3370 | .align = __alignof__(unsigned long), | |
3371 | }, | |
68e942e8 PM |
3372 | [NFT_SET_EXT_USERDATA] = { |
3373 | .len = sizeof(struct nft_userdata), | |
3374 | .align = __alignof__(struct nft_userdata), | |
3375 | }, | |
3ac4c07a PM |
3376 | }; |
3377 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
3378 | ||
20a69341 PM |
3379 | /* |
3380 | * Set elements | |
3381 | */ | |
3382 | ||
3383 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
3384 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
3385 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
3386 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 3387 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
3388 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
3389 | .len = NFT_USERDATA_MAXLEN }, | |
20a69341 PM |
3390 | }; |
3391 | ||
3392 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
b2fbd044 LZ |
3393 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, |
3394 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
3395 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, | |
3396 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
20a69341 | 3397 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
958bee14 | 3398 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
3399 | }; |
3400 | ||
633c9a84 | 3401 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
3402 | const struct sk_buff *skb, |
3403 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
3404 | const struct nlattr * const nla[], |
3405 | u8 genmask) | |
20a69341 PM |
3406 | { |
3407 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
3408 | struct nft_af_info *afi; |
3409 | struct nft_table *table; | |
20a69341 | 3410 | |
99633ab2 | 3411 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
3412 | if (IS_ERR(afi)) |
3413 | return PTR_ERR(afi); | |
3414 | ||
f2a6d766 PNA |
3415 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE], |
3416 | genmask); | |
20a69341 PM |
3417 | if (IS_ERR(table)) |
3418 | return PTR_ERR(table); | |
3419 | ||
633c9a84 | 3420 | nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
3421 | return 0; |
3422 | } | |
3423 | ||
3424 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
3425 | const struct nft_set *set, | |
3426 | const struct nft_set_elem *elem) | |
3427 | { | |
fe2811eb | 3428 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3429 | unsigned char *b = skb_tail_pointer(skb); |
3430 | struct nlattr *nest; | |
3431 | ||
3432 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
3433 | if (nest == NULL) | |
3434 | goto nla_put_failure; | |
3435 | ||
fe2811eb PM |
3436 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
3437 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
3438 | goto nla_put_failure; |
3439 | ||
fe2811eb PM |
3440 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3441 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
3442 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
3443 | set->dlen) < 0) | |
3444 | goto nla_put_failure; | |
3445 | ||
f25ad2e9 PM |
3446 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3447 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3448 | goto nla_put_failure; | |
3449 | ||
8aeff920 PNA |
3450 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && |
3451 | nla_put_string(skb, NFTA_SET_ELEM_OBJREF, | |
3452 | (*nft_set_ext_obj(ext))->name) < 0) | |
3453 | goto nla_put_failure; | |
3454 | ||
fe2811eb PM |
3455 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3456 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3457 | htonl(*nft_set_ext_flags(ext)))) | |
3458 | goto nla_put_failure; | |
20a69341 | 3459 | |
c3e1b005 PM |
3460 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3461 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
d3e2a111 AP |
3462 | cpu_to_be64(jiffies_to_msecs( |
3463 | *nft_set_ext_timeout(ext))), | |
b46f6ded | 3464 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3465 | goto nla_put_failure; |
3466 | ||
3467 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
3468 | unsigned long expires, now = jiffies; | |
3469 | ||
3470 | expires = *nft_set_ext_expiration(ext); | |
3471 | if (time_before(now, expires)) | |
3472 | expires -= now; | |
3473 | else | |
3474 | expires = 0; | |
3475 | ||
3476 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
b46f6ded ND |
3477 | cpu_to_be64(jiffies_to_msecs(expires)), |
3478 | NFTA_SET_ELEM_PAD)) | |
c3e1b005 PM |
3479 | goto nla_put_failure; |
3480 | } | |
3481 | ||
68e942e8 PM |
3482 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3483 | struct nft_userdata *udata; | |
3484 | ||
3485 | udata = nft_set_ext_userdata(ext); | |
3486 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3487 | udata->len + 1, udata->data)) | |
3488 | goto nla_put_failure; | |
3489 | } | |
3490 | ||
20a69341 PM |
3491 | nla_nest_end(skb, nest); |
3492 | return 0; | |
3493 | ||
3494 | nla_put_failure: | |
3495 | nlmsg_trim(skb, b); | |
3496 | return -EMSGSIZE; | |
3497 | } | |
3498 | ||
3499 | struct nft_set_dump_args { | |
3500 | const struct netlink_callback *cb; | |
3501 | struct nft_set_iter iter; | |
3502 | struct sk_buff *skb; | |
3503 | }; | |
3504 | ||
3505 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
de70185d | 3506 | struct nft_set *set, |
20a69341 | 3507 | const struct nft_set_iter *iter, |
de70185d | 3508 | struct nft_set_elem *elem) |
20a69341 PM |
3509 | { |
3510 | struct nft_set_dump_args *args; | |
3511 | ||
3512 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3513 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3514 | } | |
3515 | ||
fa803605 LZ |
3516 | struct nft_set_dump_ctx { |
3517 | const struct nft_set *set; | |
3518 | struct nft_ctx ctx; | |
3519 | }; | |
3520 | ||
20a69341 PM |
3521 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
3522 | { | |
fa803605 | 3523 | struct nft_set_dump_ctx *dump_ctx = cb->data; |
633c9a84 | 3524 | struct net *net = sock_net(skb->sk); |
fa803605 LZ |
3525 | struct nft_af_info *afi; |
3526 | struct nft_table *table; | |
de70185d | 3527 | struct nft_set *set; |
20a69341 | 3528 | struct nft_set_dump_args args; |
fa803605 | 3529 | bool set_found = false; |
20a69341 PM |
3530 | struct nfgenmsg *nfmsg; |
3531 | struct nlmsghdr *nlh; | |
3532 | struct nlattr *nest; | |
3533 | u32 portid, seq; | |
fa803605 | 3534 | int event; |
20a69341 | 3535 | |
fa803605 LZ |
3536 | rcu_read_lock(); |
3537 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
3538 | if (afi != dump_ctx->ctx.afi) | |
3539 | continue; | |
20a69341 | 3540 | |
fa803605 LZ |
3541 | list_for_each_entry_rcu(table, &afi->tables, list) { |
3542 | if (table != dump_ctx->ctx.table) | |
3543 | continue; | |
20a69341 | 3544 | |
fa803605 LZ |
3545 | list_for_each_entry_rcu(set, &table->sets, list) { |
3546 | if (set == dump_ctx->set) { | |
3547 | set_found = true; | |
3548 | break; | |
3549 | } | |
3550 | } | |
3551 | break; | |
3552 | } | |
3553 | break; | |
3554 | } | |
3555 | ||
3556 | if (!set_found) { | |
3557 | rcu_read_unlock(); | |
3558 | return -ENOENT; | |
3559 | } | |
20a69341 | 3560 | |
dedb67c4 | 3561 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); |
20a69341 PM |
3562 | portid = NETLINK_CB(cb->skb).portid; |
3563 | seq = cb->nlh->nlmsg_seq; | |
3564 | ||
3565 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3566 | NLM_F_MULTI); | |
3567 | if (nlh == NULL) | |
3568 | goto nla_put_failure; | |
3569 | ||
3570 | nfmsg = nlmsg_data(nlh); | |
fa803605 | 3571 | nfmsg->nfgen_family = afi->family; |
20a69341 | 3572 | nfmsg->version = NFNETLINK_V0; |
fa803605 | 3573 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
20a69341 | 3574 | |
fa803605 | 3575 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) |
20a69341 PM |
3576 | goto nla_put_failure; |
3577 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3578 | goto nla_put_failure; | |
3579 | ||
3580 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3581 | if (nest == NULL) | |
3582 | goto nla_put_failure; | |
3583 | ||
8588ac09 PNA |
3584 | args.cb = cb; |
3585 | args.skb = skb; | |
fa803605 | 3586 | args.iter.genmask = nft_genmask_cur(net); |
8588ac09 PNA |
3587 | args.iter.skip = cb->args[0]; |
3588 | args.iter.count = 0; | |
3589 | args.iter.err = 0; | |
3590 | args.iter.fn = nf_tables_dump_setelem; | |
fa803605 LZ |
3591 | set->ops->walk(&dump_ctx->ctx, set, &args.iter); |
3592 | rcu_read_unlock(); | |
20a69341 PM |
3593 | |
3594 | nla_nest_end(skb, nest); | |
3595 | nlmsg_end(skb, nlh); | |
3596 | ||
3597 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3598 | return args.iter.err; | |
3599 | if (args.iter.count == cb->args[0]) | |
3600 | return 0; | |
3601 | ||
3602 | cb->args[0] = args.iter.count; | |
3603 | return skb->len; | |
3604 | ||
3605 | nla_put_failure: | |
fa803605 | 3606 | rcu_read_unlock(); |
20a69341 PM |
3607 | return -ENOSPC; |
3608 | } | |
3609 | ||
fa803605 LZ |
3610 | static int nf_tables_dump_set_done(struct netlink_callback *cb) |
3611 | { | |
3612 | kfree(cb->data); | |
3613 | return 0; | |
3614 | } | |
3615 | ||
d60ce62f AB |
3616 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
3617 | const struct nft_ctx *ctx, u32 seq, | |
3618 | u32 portid, int event, u16 flags, | |
3619 | const struct nft_set *set, | |
3620 | const struct nft_set_elem *elem) | |
3621 | { | |
3622 | struct nfgenmsg *nfmsg; | |
3623 | struct nlmsghdr *nlh; | |
3624 | struct nlattr *nest; | |
3625 | int err; | |
3626 | ||
dedb67c4 | 3627 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
d60ce62f AB |
3628 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
3629 | flags); | |
3630 | if (nlh == NULL) | |
3631 | goto nla_put_failure; | |
3632 | ||
3633 | nfmsg = nlmsg_data(nlh); | |
3634 | nfmsg->nfgen_family = ctx->afi->family; | |
3635 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 3636 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
3637 | |
3638 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3639 | goto nla_put_failure; | |
3640 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3641 | goto nla_put_failure; | |
3642 | ||
3643 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3644 | if (nest == NULL) | |
3645 | goto nla_put_failure; | |
3646 | ||
3647 | err = nf_tables_fill_setelem(skb, set, elem); | |
3648 | if (err < 0) | |
3649 | goto nla_put_failure; | |
3650 | ||
3651 | nla_nest_end(skb, nest); | |
3652 | ||
053c095a JB |
3653 | nlmsg_end(skb, nlh); |
3654 | return 0; | |
d60ce62f AB |
3655 | |
3656 | nla_put_failure: | |
3657 | nlmsg_trim(skb, nlh); | |
3658 | return -1; | |
3659 | } | |
3660 | ||
ba0e4d99 PNA |
3661 | static int nft_setelem_parse_flags(const struct nft_set *set, |
3662 | const struct nlattr *attr, u32 *flags) | |
3663 | { | |
3664 | if (attr == NULL) | |
3665 | return 0; | |
3666 | ||
3667 | *flags = ntohl(nla_get_be32(attr)); | |
3668 | if (*flags & ~NFT_SET_ELEM_INTERVAL_END) | |
3669 | return -EINVAL; | |
3670 | if (!(set->flags & NFT_SET_INTERVAL) && | |
3671 | *flags & NFT_SET_ELEM_INTERVAL_END) | |
3672 | return -EINVAL; | |
3673 | ||
3674 | return 0; | |
3675 | } | |
3676 | ||
3677 | static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set, | |
3678 | const struct nlattr *attr) | |
3679 | { | |
3680 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3681 | const struct nft_set_ext *ext; | |
3682 | struct nft_data_desc desc; | |
3683 | struct nft_set_elem elem; | |
3684 | struct sk_buff *skb; | |
3685 | uint32_t flags = 0; | |
3686 | void *priv; | |
3687 | int err; | |
3688 | ||
3689 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3690 | nft_set_elem_policy, NULL); | |
3691 | if (err < 0) | |
3692 | return err; | |
3693 | ||
3694 | if (!nla[NFTA_SET_ELEM_KEY]) | |
3695 | return -EINVAL; | |
3696 | ||
3697 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
3698 | if (err < 0) | |
3699 | return err; | |
3700 | ||
3701 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, | |
3702 | nla[NFTA_SET_ELEM_KEY]); | |
3703 | if (err < 0) | |
3704 | return err; | |
3705 | ||
3706 | err = -EINVAL; | |
3707 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
3708 | return err; | |
3709 | ||
3710 | priv = set->ops->get(ctx->net, set, &elem, flags); | |
3711 | if (IS_ERR(priv)) | |
3712 | return PTR_ERR(priv); | |
3713 | ||
3714 | elem.priv = priv; | |
3715 | ext = nft_set_elem_ext(set, &elem); | |
3716 | ||
3717 | err = -ENOMEM; | |
3718 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
3719 | if (skb == NULL) | |
3720 | goto err1; | |
3721 | ||
3722 | err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid, | |
3723 | NFT_MSG_NEWSETELEM, 0, set, &elem); | |
3724 | if (err < 0) | |
3725 | goto err2; | |
3726 | ||
3727 | err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT); | |
3728 | /* This avoids a loop in nfnetlink. */ | |
3729 | if (err < 0) | |
3730 | goto err1; | |
3731 | ||
3732 | return 0; | |
3733 | err2: | |
3734 | kfree_skb(skb); | |
3735 | err1: | |
3736 | /* this avoids a loop in nfnetlink. */ | |
3737 | return err == -EAGAIN ? -ENOBUFS : err; | |
3738 | } | |
3739 | ||
3740 | static int nf_tables_getsetelem(struct net *net, struct sock *nlsk, | |
3741 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
3742 | const struct nlattr * const nla[], | |
3743 | struct netlink_ext_ack *extack) | |
3744 | { | |
3745 | u8 genmask = nft_genmask_cur(net); | |
3746 | struct nft_set *set; | |
3747 | struct nlattr *attr; | |
3748 | struct nft_ctx ctx; | |
3749 | int rem, err = 0; | |
3750 | ||
3751 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); | |
3752 | if (err < 0) | |
3753 | return err; | |
3754 | ||
3755 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], | |
3756 | genmask); | |
3757 | if (IS_ERR(set)) | |
3758 | return PTR_ERR(set); | |
3759 | ||
3760 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3761 | struct netlink_dump_control c = { | |
3762 | .dump = nf_tables_dump_set, | |
3763 | .done = nf_tables_dump_set_done, | |
3764 | }; | |
3765 | struct nft_set_dump_ctx *dump_ctx; | |
3766 | ||
3767 | dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL); | |
3768 | if (!dump_ctx) | |
3769 | return -ENOMEM; | |
3770 | ||
3771 | dump_ctx->set = set; | |
3772 | dump_ctx->ctx = ctx; | |
3773 | ||
3774 | c.data = dump_ctx; | |
3775 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
3776 | } | |
3777 | ||
3778 | if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) | |
3779 | return -EINVAL; | |
3780 | ||
3781 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3782 | err = nft_get_set_elem(&ctx, set, attr); | |
3783 | if (err < 0) | |
3784 | break; | |
3785 | } | |
3786 | ||
3787 | return err; | |
3788 | } | |
3789 | ||
25e94a99 PNA |
3790 | static void nf_tables_setelem_notify(const struct nft_ctx *ctx, |
3791 | const struct nft_set *set, | |
3792 | const struct nft_set_elem *elem, | |
3793 | int event, u16 flags) | |
d60ce62f | 3794 | { |
128ad332 PNA |
3795 | struct net *net = ctx->net; |
3796 | u32 portid = ctx->portid; | |
d60ce62f AB |
3797 | struct sk_buff *skb; |
3798 | int err; | |
3799 | ||
128ad332 | 3800 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
25e94a99 | 3801 | return; |
d60ce62f | 3802 | |
d60ce62f AB |
3803 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
3804 | if (skb == NULL) | |
3805 | goto err; | |
3806 | ||
3807 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
3808 | set, elem); | |
3809 | if (err < 0) { | |
3810 | kfree_skb(skb); | |
3811 | goto err; | |
3812 | } | |
3813 | ||
25e94a99 PNA |
3814 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
3815 | GFP_KERNEL); | |
3816 | return; | |
d60ce62f | 3817 | err: |
25e94a99 | 3818 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
d60ce62f AB |
3819 | } |
3820 | ||
60319eb1 PNA |
3821 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
3822 | int msg_type, | |
3823 | struct nft_set *set) | |
3824 | { | |
3825 | struct nft_trans *trans; | |
3826 | ||
3827 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
3828 | if (trans == NULL) | |
3829 | return NULL; | |
3830 | ||
3831 | nft_trans_elem_set(trans) = set; | |
3832 | return trans; | |
3833 | } | |
3834 | ||
22fe54d5 PM |
3835 | void *nft_set_elem_init(const struct nft_set *set, |
3836 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 3837 | const u32 *key, const u32 *data, |
22fe54d5 | 3838 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
3839 | { |
3840 | struct nft_set_ext *ext; | |
3841 | void *elem; | |
3842 | ||
3843 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
3844 | if (elem == NULL) | |
3845 | return NULL; | |
3846 | ||
3847 | ext = nft_set_elem_ext(set, elem); | |
3848 | nft_set_ext_init(ext, tmpl); | |
3849 | ||
3850 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
3851 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3852 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
3853 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
3854 | *nft_set_ext_expiration(ext) = | |
d3e2a111 | 3855 | jiffies + timeout; |
c3e1b005 PM |
3856 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) |
3857 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
3858 | |
3859 | return elem; | |
3860 | } | |
3861 | ||
61f9e292 LZ |
3862 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
3863 | bool destroy_expr) | |
61edafbb PM |
3864 | { |
3865 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3866 | ||
59105446 | 3867 | nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); |
61edafbb | 3868 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) |
59105446 | 3869 | nft_data_release(nft_set_ext_data(ext), set->dtype); |
61f9e292 | 3870 | if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) |
f25ad2e9 | 3871 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); |
8aeff920 PNA |
3872 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) |
3873 | (*nft_set_ext_obj(ext))->use--; | |
61edafbb PM |
3874 | kfree(elem); |
3875 | } | |
3876 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
3877 | ||
59105446 PNA |
3878 | /* Only called from commit path, nft_set_elem_deactivate() already deals with |
3879 | * the refcounting from the preparation phase. | |
3880 | */ | |
3881 | static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem) | |
3882 | { | |
3883 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3884 | ||
3885 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) | |
3886 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); | |
3887 | kfree(elem); | |
3888 | } | |
3889 | ||
60319eb1 | 3890 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
c016c7e4 | 3891 | const struct nlattr *attr, u32 nlmsg_flags) |
20a69341 PM |
3892 | { |
3893 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
8aeff920 | 3894 | u8 genmask = nft_genmask_next(ctx->net); |
20a69341 | 3895 | struct nft_data_desc d1, d2; |
fe2811eb | 3896 | struct nft_set_ext_tmpl tmpl; |
c016c7e4 | 3897 | struct nft_set_ext *ext, *ext2; |
20a69341 PM |
3898 | struct nft_set_elem elem; |
3899 | struct nft_set_binding *binding; | |
8aeff920 | 3900 | struct nft_object *obj = NULL; |
68e942e8 | 3901 | struct nft_userdata *udata; |
fe2811eb | 3902 | struct nft_data data; |
20a69341 | 3903 | enum nft_registers dreg; |
60319eb1 | 3904 | struct nft_trans *trans; |
0e9091d6 | 3905 | u32 flags = 0; |
c3e1b005 | 3906 | u64 timeout; |
68e942e8 | 3907 | u8 ulen; |
20a69341 PM |
3908 | int err; |
3909 | ||
3910 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 3911 | nft_set_elem_policy, NULL); |
20a69341 PM |
3912 | if (err < 0) |
3913 | return err; | |
3914 | ||
3915 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3916 | return -EINVAL; | |
3917 | ||
fe2811eb PM |
3918 | nft_set_ext_prepare(&tmpl); |
3919 | ||
0e9091d6 PNA |
3920 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); |
3921 | if (err < 0) | |
3922 | return err; | |
3923 | if (flags != 0) | |
3924 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
3925 | |
3926 | if (set->flags & NFT_SET_MAP) { | |
3927 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 3928 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 3929 | return -EINVAL; |
bd7fc645 | 3930 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 3931 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 3932 | return -EINVAL; |
20a69341 PM |
3933 | } else { |
3934 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
3935 | return -EINVAL; | |
3936 | } | |
3937 | ||
c3e1b005 PM |
3938 | timeout = 0; |
3939 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
3940 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
3941 | return -EINVAL; | |
d3e2a111 AP |
3942 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3943 | nla[NFTA_SET_ELEM_TIMEOUT]))); | |
c3e1b005 PM |
3944 | } else if (set->flags & NFT_SET_TIMEOUT) { |
3945 | timeout = set->timeout; | |
3946 | } | |
3947 | ||
7d740264 | 3948 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 3949 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3950 | if (err < 0) |
3951 | goto err1; | |
3952 | err = -EINVAL; | |
3953 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
3954 | goto err2; | |
3955 | ||
7d740264 | 3956 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
3957 | if (timeout > 0) { |
3958 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
3959 | if (timeout != set->timeout) | |
3960 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
3961 | } | |
fe2811eb | 3962 | |
8aeff920 PNA |
3963 | if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { |
3964 | if (!(set->flags & NFT_SET_OBJECT)) { | |
3965 | err = -EINVAL; | |
3966 | goto err2; | |
3967 | } | |
3968 | obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF], | |
3969 | set->objtype, genmask); | |
3970 | if (IS_ERR(obj)) { | |
3971 | err = PTR_ERR(obj); | |
3972 | goto err2; | |
3973 | } | |
3974 | nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); | |
3975 | } | |
3976 | ||
20a69341 | 3977 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
3978 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
3979 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
3980 | if (err < 0) |
3981 | goto err2; | |
3982 | ||
3983 | err = -EINVAL; | |
3984 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
3985 | goto err3; | |
3986 | ||
3987 | dreg = nft_type_to_reg(set->dtype); | |
3988 | list_for_each_entry(binding, &set->bindings, list) { | |
3989 | struct nft_ctx bind_ctx = { | |
58c78e10 | 3990 | .net = ctx->net, |
20a69341 PM |
3991 | .afi = ctx->afi, |
3992 | .table = ctx->table, | |
7c95f6d8 | 3993 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
3994 | }; |
3995 | ||
11113e19 PM |
3996 | if (!(binding->flags & NFT_SET_MAP)) |
3997 | continue; | |
3998 | ||
1ec10212 PM |
3999 | err = nft_validate_register_store(&bind_ctx, dreg, |
4000 | &data, | |
4001 | d2.type, d2.len); | |
20a69341 PM |
4002 | if (err < 0) |
4003 | goto err3; | |
4004 | } | |
fe2811eb | 4005 | |
7d740264 | 4006 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
4007 | } |
4008 | ||
68e942e8 PM |
4009 | /* The full maximum length of userdata can exceed the maximum |
4010 | * offset value (U8_MAX) for following extensions, therefor it | |
4011 | * must be the last extension added. | |
4012 | */ | |
4013 | ulen = 0; | |
4014 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
4015 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
4016 | if (ulen > 0) | |
4017 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
4018 | ulen); | |
4019 | } | |
4020 | ||
fe2811eb | 4021 | err = -ENOMEM; |
7d740264 | 4022 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 4023 | timeout, GFP_KERNEL); |
fe2811eb PM |
4024 | if (elem.priv == NULL) |
4025 | goto err3; | |
4026 | ||
4027 | ext = nft_set_elem_ext(set, elem.priv); | |
4028 | if (flags) | |
4029 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
4030 | if (ulen > 0) { |
4031 | udata = nft_set_ext_userdata(ext); | |
4032 | udata->len = ulen - 1; | |
4033 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
4034 | } | |
8aeff920 PNA |
4035 | if (obj) { |
4036 | *nft_set_ext_obj(ext) = obj; | |
4037 | obj->use++; | |
4038 | } | |
fe2811eb | 4039 | |
60319eb1 PNA |
4040 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
4041 | if (trans == NULL) | |
fe2811eb | 4042 | goto err4; |
60319eb1 | 4043 | |
69086658 | 4044 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
c016c7e4 PNA |
4045 | err = set->ops->insert(ctx->net, set, &elem, &ext2); |
4046 | if (err) { | |
4047 | if (err == -EEXIST) { | |
9744a6fc PNA |
4048 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ |
4049 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || | |
4050 | nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ | |
4051 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) | |
4052 | return -EBUSY; | |
8aeff920 PNA |
4053 | if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
4054 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && | |
4055 | memcmp(nft_set_ext_data(ext), | |
4056 | nft_set_ext_data(ext2), set->dlen) != 0) || | |
4057 | (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && | |
4058 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && | |
4059 | *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) | |
c016c7e4 PNA |
4060 | err = -EBUSY; |
4061 | else if (!(nlmsg_flags & NLM_F_EXCL)) | |
4062 | err = 0; | |
4063 | } | |
fe2811eb | 4064 | goto err5; |
c016c7e4 | 4065 | } |
20a69341 | 4066 | |
35d0ac90 PNA |
4067 | if (set->size && |
4068 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { | |
4069 | err = -ENFILE; | |
4070 | goto err6; | |
4071 | } | |
4072 | ||
60319eb1 | 4073 | nft_trans_elem(trans) = elem; |
46bbafce | 4074 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
4075 | return 0; |
4076 | ||
35d0ac90 | 4077 | err6: |
5cb82a38 | 4078 | set->ops->remove(ctx->net, set, &elem); |
fe2811eb | 4079 | err5: |
60319eb1 | 4080 | kfree(trans); |
fe2811eb PM |
4081 | err4: |
4082 | kfree(elem.priv); | |
20a69341 PM |
4083 | err3: |
4084 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
59105446 | 4085 | nft_data_release(&data, d2.type); |
20a69341 | 4086 | err2: |
59105446 | 4087 | nft_data_release(&elem.key.val, d1.type); |
20a69341 PM |
4088 | err1: |
4089 | return err; | |
4090 | } | |
4091 | ||
633c9a84 PNA |
4092 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
4093 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4094 | const struct nlattr * const nla[], |
4095 | struct netlink_ext_ack *extack) | |
20a69341 | 4096 | { |
f2a6d766 | 4097 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4098 | const struct nlattr *attr; |
4099 | struct nft_set *set; | |
4100 | struct nft_ctx ctx; | |
60319eb1 | 4101 | int rem, err = 0; |
20a69341 | 4102 | |
7d5570ca PNA |
4103 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
4104 | return -EINVAL; | |
4105 | ||
f2a6d766 | 4106 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
4107 | if (err < 0) |
4108 | return err; | |
4109 | ||
37a9cc52 PNA |
4110 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
4111 | genmask); | |
958bee14 PNA |
4112 | if (IS_ERR(set)) { |
4113 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { | |
4114 | set = nf_tables_set_lookup_byid(net, | |
37a9cc52 PNA |
4115 | nla[NFTA_SET_ELEM_LIST_SET_ID], |
4116 | genmask); | |
958bee14 PNA |
4117 | } |
4118 | if (IS_ERR(set)) | |
4119 | return PTR_ERR(set); | |
4120 | } | |
4121 | ||
20a69341 PM |
4122 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
4123 | return -EBUSY; | |
4124 | ||
4125 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
c016c7e4 | 4126 | err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags); |
35d0ac90 | 4127 | if (err < 0) |
60319eb1 | 4128 | break; |
20a69341 | 4129 | } |
60319eb1 | 4130 | return err; |
20a69341 PM |
4131 | } |
4132 | ||
59105446 PNA |
4133 | /** |
4134 | * nft_data_hold - hold a nft_data item | |
4135 | * | |
4136 | * @data: struct nft_data to release | |
4137 | * @type: type of data | |
4138 | * | |
4139 | * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
4140 | * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and | |
4141 | * NFT_GOTO verdicts. This function must be called on active data objects | |
4142 | * from the second phase of the commit protocol. | |
4143 | */ | |
4144 | static void nft_data_hold(const struct nft_data *data, enum nft_data_types type) | |
4145 | { | |
4146 | if (type == NFT_DATA_VERDICT) { | |
4147 | switch (data->verdict.code) { | |
4148 | case NFT_JUMP: | |
4149 | case NFT_GOTO: | |
4150 | data->verdict.chain->use++; | |
4151 | break; | |
4152 | } | |
4153 | } | |
4154 | } | |
4155 | ||
4156 | static void nft_set_elem_activate(const struct net *net, | |
4157 | const struct nft_set *set, | |
4158 | struct nft_set_elem *elem) | |
4159 | { | |
4160 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4161 | ||
4162 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4163 | nft_data_hold(nft_set_ext_data(ext), set->dtype); | |
4164 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4165 | (*nft_set_ext_obj(ext))->use++; | |
4166 | } | |
4167 | ||
4168 | static void nft_set_elem_deactivate(const struct net *net, | |
4169 | const struct nft_set *set, | |
4170 | struct nft_set_elem *elem) | |
4171 | { | |
4172 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4173 | ||
4174 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4175 | nft_data_release(nft_set_ext_data(ext), set->dtype); | |
4176 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4177 | (*nft_set_ext_obj(ext))->use--; | |
4178 | } | |
4179 | ||
60319eb1 | 4180 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
4181 | const struct nlattr *attr) |
4182 | { | |
4183 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3971ca14 | 4184 | struct nft_set_ext_tmpl tmpl; |
20a69341 PM |
4185 | struct nft_data_desc desc; |
4186 | struct nft_set_elem elem; | |
3971ca14 | 4187 | struct nft_set_ext *ext; |
60319eb1 | 4188 | struct nft_trans *trans; |
3971ca14 PNA |
4189 | u32 flags = 0; |
4190 | void *priv; | |
20a69341 PM |
4191 | int err; |
4192 | ||
4193 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 4194 | nft_set_elem_policy, NULL); |
20a69341 PM |
4195 | if (err < 0) |
4196 | goto err1; | |
4197 | ||
4198 | err = -EINVAL; | |
4199 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
4200 | goto err1; | |
4201 | ||
3971ca14 PNA |
4202 | nft_set_ext_prepare(&tmpl); |
4203 | ||
4204 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
4205 | if (err < 0) | |
4206 | return err; | |
4207 | if (flags != 0) | |
4208 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
4209 | ||
7d740264 | 4210 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 4211 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
4212 | if (err < 0) |
4213 | goto err1; | |
4214 | ||
4215 | err = -EINVAL; | |
4216 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
4217 | goto err2; | |
4218 | ||
3971ca14 PNA |
4219 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len); |
4220 | ||
4221 | err = -ENOMEM; | |
4222 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0, | |
4223 | GFP_KERNEL); | |
4224 | if (elem.priv == NULL) | |
4225 | goto err2; | |
4226 | ||
4227 | ext = nft_set_elem_ext(set, elem.priv); | |
4228 | if (flags) | |
4229 | *nft_set_ext_flags(ext) = flags; | |
4230 | ||
60319eb1 | 4231 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
4232 | if (trans == NULL) { |
4233 | err = -ENOMEM; | |
3971ca14 | 4234 | goto err3; |
609ccf08 | 4235 | } |
20a69341 | 4236 | |
42a55769 | 4237 | priv = set->ops->deactivate(ctx->net, set, &elem); |
3971ca14 | 4238 | if (priv == NULL) { |
cc02e457 | 4239 | err = -ENOENT; |
3971ca14 | 4240 | goto err4; |
cc02e457 | 4241 | } |
3971ca14 PNA |
4242 | kfree(elem.priv); |
4243 | elem.priv = priv; | |
cc02e457 | 4244 | |
59105446 PNA |
4245 | nft_set_elem_deactivate(ctx->net, set, &elem); |
4246 | ||
60319eb1 | 4247 | nft_trans_elem(trans) = elem; |
46bbafce | 4248 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 4249 | return 0; |
cc02e457 | 4250 | |
3971ca14 | 4251 | err4: |
cc02e457 | 4252 | kfree(trans); |
3971ca14 PNA |
4253 | err3: |
4254 | kfree(elem.priv); | |
20a69341 | 4255 | err2: |
59105446 | 4256 | nft_data_release(&elem.key.val, desc.type); |
20a69341 PM |
4257 | err1: |
4258 | return err; | |
4259 | } | |
4260 | ||
8411b644 | 4261 | static int nft_flush_set(const struct nft_ctx *ctx, |
de70185d | 4262 | struct nft_set *set, |
8411b644 | 4263 | const struct nft_set_iter *iter, |
de70185d | 4264 | struct nft_set_elem *elem) |
8411b644 PNA |
4265 | { |
4266 | struct nft_trans *trans; | |
4267 | int err; | |
4268 | ||
4269 | trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, | |
4270 | sizeof(struct nft_trans_elem), GFP_ATOMIC); | |
4271 | if (!trans) | |
4272 | return -ENOMEM; | |
4273 | ||
1ba1c414 | 4274 | if (!set->ops->flush(ctx->net, set, elem->priv)) { |
8411b644 PNA |
4275 | err = -ENOENT; |
4276 | goto err1; | |
4277 | } | |
b2c11e4b | 4278 | set->ndeact++; |
8411b644 | 4279 | |
de70185d PNA |
4280 | nft_trans_elem_set(trans) = set; |
4281 | nft_trans_elem(trans) = *elem; | |
8411b644 PNA |
4282 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
4283 | ||
4284 | return 0; | |
4285 | err1: | |
4286 | kfree(trans); | |
4287 | return err; | |
4288 | } | |
4289 | ||
633c9a84 PNA |
4290 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
4291 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4292 | const struct nlattr * const nla[], |
4293 | struct netlink_ext_ack *extack) | |
20a69341 | 4294 | { |
f2a6d766 | 4295 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4296 | const struct nlattr *attr; |
4297 | struct nft_set *set; | |
4298 | struct nft_ctx ctx; | |
60319eb1 | 4299 | int rem, err = 0; |
20a69341 | 4300 | |
f2a6d766 | 4301 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
4302 | if (err < 0) |
4303 | return err; | |
4304 | ||
37a9cc52 PNA |
4305 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
4306 | genmask); | |
20a69341 PM |
4307 | if (IS_ERR(set)) |
4308 | return PTR_ERR(set); | |
4309 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
4310 | return -EBUSY; | |
4311 | ||
8411b644 | 4312 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) { |
baa2d42c PNA |
4313 | struct nft_set_iter iter = { |
4314 | .genmask = genmask, | |
4315 | .fn = nft_flush_set, | |
8411b644 | 4316 | }; |
baa2d42c | 4317 | set->ops->walk(&ctx, set, &iter); |
8411b644 | 4318 | |
baa2d42c | 4319 | return iter.err; |
8411b644 PNA |
4320 | } |
4321 | ||
20a69341 PM |
4322 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
4323 | err = nft_del_setelem(&ctx, set, attr); | |
4324 | if (err < 0) | |
60319eb1 | 4325 | break; |
4fefee57 | 4326 | |
3dd0673a | 4327 | set->ndeact++; |
20a69341 | 4328 | } |
60319eb1 | 4329 | return err; |
20a69341 PM |
4330 | } |
4331 | ||
cfed7e1b PM |
4332 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
4333 | { | |
4334 | struct nft_set_gc_batch *gcb; | |
4335 | unsigned int i; | |
4336 | ||
4337 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
4338 | for (i = 0; i < gcb->head.cnt; i++) | |
61f9e292 | 4339 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); |
cfed7e1b PM |
4340 | kfree(gcb); |
4341 | } | |
4342 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
4343 | ||
4344 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
4345 | gfp_t gfp) | |
4346 | { | |
4347 | struct nft_set_gc_batch *gcb; | |
4348 | ||
4349 | gcb = kzalloc(sizeof(*gcb), gfp); | |
4350 | if (gcb == NULL) | |
4351 | return gcb; | |
4352 | gcb->head.set = set; | |
4353 | return gcb; | |
4354 | } | |
4355 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
4356 | ||
e5009240 PNA |
4357 | /* |
4358 | * Stateful objects | |
4359 | */ | |
4360 | ||
4361 | /** | |
4362 | * nft_register_obj- register nf_tables stateful object type | |
4363 | * @obj: object type | |
4364 | * | |
4365 | * Registers the object type for use with nf_tables. Returns zero on | |
4366 | * success or a negative errno code otherwise. | |
4367 | */ | |
4368 | int nft_register_obj(struct nft_object_type *obj_type) | |
4369 | { | |
4370 | if (obj_type->type == NFT_OBJECT_UNSPEC) | |
4371 | return -EINVAL; | |
4372 | ||
4373 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4374 | list_add_rcu(&obj_type->list, &nf_tables_objects); | |
4375 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4376 | return 0; | |
4377 | } | |
4378 | EXPORT_SYMBOL_GPL(nft_register_obj); | |
4379 | ||
4380 | /** | |
4381 | * nft_unregister_obj - unregister nf_tables object type | |
4382 | * @obj: object type | |
4383 | * | |
4384 | * Unregisters the object type for use with nf_tables. | |
4385 | */ | |
4386 | void nft_unregister_obj(struct nft_object_type *obj_type) | |
4387 | { | |
4388 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4389 | list_del_rcu(&obj_type->list); | |
4390 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4391 | } | |
4392 | EXPORT_SYMBOL_GPL(nft_unregister_obj); | |
4393 | ||
4394 | struct nft_object *nf_tables_obj_lookup(const struct nft_table *table, | |
4395 | const struct nlattr *nla, | |
4396 | u32 objtype, u8 genmask) | |
4397 | { | |
4398 | struct nft_object *obj; | |
4399 | ||
4400 | list_for_each_entry(obj, &table->objects, list) { | |
4401 | if (!nla_strcmp(nla, obj->name) && | |
dfc46034 | 4402 | objtype == obj->ops->type->type && |
e5009240 PNA |
4403 | nft_active_genmask(obj, genmask)) |
4404 | return obj; | |
4405 | } | |
4406 | return ERR_PTR(-ENOENT); | |
4407 | } | |
4408 | EXPORT_SYMBOL_GPL(nf_tables_obj_lookup); | |
4409 | ||
4410 | static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { | |
b2fbd044 LZ |
4411 | [NFTA_OBJ_TABLE] = { .type = NLA_STRING, |
4412 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
4413 | [NFTA_OBJ_NAME] = { .type = NLA_STRING, | |
4414 | .len = NFT_OBJ_MAXNAMELEN - 1 }, | |
e5009240 PNA |
4415 | [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, |
4416 | [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, | |
4417 | }; | |
4418 | ||
84fba055 FW |
4419 | static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, |
4420 | const struct nft_object_type *type, | |
e5009240 PNA |
4421 | const struct nlattr *attr) |
4422 | { | |
4423 | struct nlattr *tb[type->maxattr + 1]; | |
dfc46034 | 4424 | const struct nft_object_ops *ops; |
e5009240 PNA |
4425 | struct nft_object *obj; |
4426 | int err; | |
4427 | ||
4428 | if (attr) { | |
fceb6435 JB |
4429 | err = nla_parse_nested(tb, type->maxattr, attr, type->policy, |
4430 | NULL); | |
e5009240 PNA |
4431 | if (err < 0) |
4432 | goto err1; | |
4433 | } else { | |
4434 | memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); | |
4435 | } | |
4436 | ||
dfc46034 PBG |
4437 | if (type->select_ops) { |
4438 | ops = type->select_ops(ctx, (const struct nlattr * const *)tb); | |
4439 | if (IS_ERR(ops)) { | |
4440 | err = PTR_ERR(ops); | |
4441 | goto err1; | |
4442 | } | |
4443 | } else { | |
4444 | ops = type->ops; | |
4445 | } | |
4446 | ||
e5009240 | 4447 | err = -ENOMEM; |
dfc46034 | 4448 | obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL); |
e5009240 PNA |
4449 | if (obj == NULL) |
4450 | goto err1; | |
4451 | ||
dfc46034 | 4452 | err = ops->init(ctx, (const struct nlattr * const *)tb, obj); |
e5009240 PNA |
4453 | if (err < 0) |
4454 | goto err2; | |
4455 | ||
dfc46034 PBG |
4456 | obj->ops = ops; |
4457 | ||
e5009240 PNA |
4458 | return obj; |
4459 | err2: | |
4460 | kfree(obj); | |
4461 | err1: | |
4462 | return ERR_PTR(err); | |
4463 | } | |
4464 | ||
4465 | static int nft_object_dump(struct sk_buff *skb, unsigned int attr, | |
43da04a5 | 4466 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4467 | { |
4468 | struct nlattr *nest; | |
4469 | ||
4470 | nest = nla_nest_start(skb, attr); | |
4471 | if (!nest) | |
4472 | goto nla_put_failure; | |
dfc46034 | 4473 | if (obj->ops->dump(skb, obj, reset) < 0) |
e5009240 PNA |
4474 | goto nla_put_failure; |
4475 | nla_nest_end(skb, nest); | |
4476 | return 0; | |
4477 | ||
4478 | nla_put_failure: | |
4479 | return -1; | |
4480 | } | |
4481 | ||
4482 | static const struct nft_object_type *__nft_obj_type_get(u32 objtype) | |
4483 | { | |
4484 | const struct nft_object_type *type; | |
4485 | ||
4486 | list_for_each_entry(type, &nf_tables_objects, list) { | |
4487 | if (objtype == type->type) | |
4488 | return type; | |
4489 | } | |
4490 | return NULL; | |
4491 | } | |
4492 | ||
4493 | static const struct nft_object_type *nft_obj_type_get(u32 objtype) | |
4494 | { | |
4495 | const struct nft_object_type *type; | |
4496 | ||
4497 | type = __nft_obj_type_get(objtype); | |
4498 | if (type != NULL && try_module_get(type->owner)) | |
4499 | return type; | |
4500 | ||
4501 | #ifdef CONFIG_MODULES | |
4502 | if (type == NULL) { | |
4503 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4504 | request_module("nft-obj-%u", objtype); | |
4505 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4506 | if (__nft_obj_type_get(objtype)) | |
4507 | return ERR_PTR(-EAGAIN); | |
4508 | } | |
4509 | #endif | |
4510 | return ERR_PTR(-ENOENT); | |
4511 | } | |
4512 | ||
4513 | static int nf_tables_newobj(struct net *net, struct sock *nlsk, | |
4514 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4515 | const struct nlattr * const nla[], |
4516 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4517 | { |
4518 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4519 | const struct nft_object_type *type; | |
4520 | u8 genmask = nft_genmask_next(net); | |
4521 | int family = nfmsg->nfgen_family; | |
4522 | struct nft_af_info *afi; | |
4523 | struct nft_table *table; | |
4524 | struct nft_object *obj; | |
4525 | struct nft_ctx ctx; | |
4526 | u32 objtype; | |
4527 | int err; | |
4528 | ||
4529 | if (!nla[NFTA_OBJ_TYPE] || | |
4530 | !nla[NFTA_OBJ_NAME] || | |
4531 | !nla[NFTA_OBJ_DATA]) | |
4532 | return -EINVAL; | |
4533 | ||
4534 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4535 | if (IS_ERR(afi)) | |
4536 | return PTR_ERR(afi); | |
4537 | ||
4538 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4539 | if (IS_ERR(table)) | |
4540 | return PTR_ERR(table); | |
4541 | ||
4542 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4543 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4544 | if (IS_ERR(obj)) { | |
4545 | err = PTR_ERR(obj); | |
4546 | if (err != -ENOENT) | |
4547 | return err; | |
4548 | ||
1a28ad74 | 4549 | } else { |
e5009240 PNA |
4550 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
4551 | return -EEXIST; | |
4552 | ||
4553 | return 0; | |
4554 | } | |
4555 | ||
4556 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4557 | ||
4558 | type = nft_obj_type_get(objtype); | |
4559 | if (IS_ERR(type)) | |
4560 | return PTR_ERR(type); | |
4561 | ||
84fba055 | 4562 | obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); |
e5009240 PNA |
4563 | if (IS_ERR(obj)) { |
4564 | err = PTR_ERR(obj); | |
4565 | goto err1; | |
4566 | } | |
18965317 | 4567 | obj->table = table; |
61509575 PS |
4568 | obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL); |
4569 | if (!obj->name) { | |
4570 | err = -ENOMEM; | |
4571 | goto err2; | |
4572 | } | |
e5009240 PNA |
4573 | |
4574 | err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); | |
4575 | if (err < 0) | |
61509575 | 4576 | goto err3; |
e5009240 PNA |
4577 | |
4578 | list_add_tail_rcu(&obj->list, &table->objects); | |
4579 | table->use++; | |
4580 | return 0; | |
61509575 PS |
4581 | err3: |
4582 | kfree(obj->name); | |
e5009240 | 4583 | err2: |
dfc46034 PBG |
4584 | if (obj->ops->destroy) |
4585 | obj->ops->destroy(obj); | |
e5009240 PNA |
4586 | kfree(obj); |
4587 | err1: | |
4588 | module_put(type->owner); | |
4589 | return err; | |
4590 | } | |
4591 | ||
4592 | static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, | |
4593 | u32 portid, u32 seq, int event, u32 flags, | |
4594 | int family, const struct nft_table *table, | |
43da04a5 | 4595 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4596 | { |
4597 | struct nfgenmsg *nfmsg; | |
4598 | struct nlmsghdr *nlh; | |
4599 | ||
dedb67c4 | 4600 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
e5009240 PNA |
4601 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
4602 | if (nlh == NULL) | |
4603 | goto nla_put_failure; | |
4604 | ||
4605 | nfmsg = nlmsg_data(nlh); | |
4606 | nfmsg->nfgen_family = family; | |
4607 | nfmsg->version = NFNETLINK_V0; | |
4608 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4609 | ||
4610 | if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || | |
4611 | nla_put_string(skb, NFTA_OBJ_NAME, obj->name) || | |
dfc46034 | 4612 | nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) || |
e5009240 | 4613 | nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || |
43da04a5 | 4614 | nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset)) |
e5009240 PNA |
4615 | goto nla_put_failure; |
4616 | ||
4617 | nlmsg_end(skb, nlh); | |
4618 | return 0; | |
4619 | ||
4620 | nla_put_failure: | |
4621 | nlmsg_trim(skb, nlh); | |
4622 | return -1; | |
4623 | } | |
4624 | ||
a9fea2a3 | 4625 | struct nft_obj_filter { |
e46abbcc | 4626 | char *table; |
a9fea2a3 PNA |
4627 | u32 type; |
4628 | }; | |
4629 | ||
e5009240 PNA |
4630 | static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) |
4631 | { | |
4632 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
4633 | const struct nft_af_info *afi; | |
4634 | const struct nft_table *table; | |
e5009240 | 4635 | unsigned int idx = 0, s_idx = cb->args[0]; |
a9fea2a3 | 4636 | struct nft_obj_filter *filter = cb->data; |
e5009240 PNA |
4637 | struct net *net = sock_net(skb->sk); |
4638 | int family = nfmsg->nfgen_family; | |
43da04a5 PNA |
4639 | struct nft_object *obj; |
4640 | bool reset = false; | |
4641 | ||
4642 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) | |
4643 | reset = true; | |
e5009240 PNA |
4644 | |
4645 | rcu_read_lock(); | |
4646 | cb->seq = net->nft.base_seq; | |
4647 | ||
4648 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
4649 | if (family != NFPROTO_UNSPEC && family != afi->family) | |
4650 | continue; | |
4651 | ||
4652 | list_for_each_entry_rcu(table, &afi->tables, list) { | |
4653 | list_for_each_entry_rcu(obj, &table->objects, list) { | |
4654 | if (!nft_is_active(net, obj)) | |
4655 | goto cont; | |
4656 | if (idx < s_idx) | |
4657 | goto cont; | |
4658 | if (idx > s_idx) | |
4659 | memset(&cb->args[1], 0, | |
4660 | sizeof(cb->args) - sizeof(cb->args[0])); | |
d21e540b | 4661 | if (filter && filter->table[0] && |
a9fea2a3 PNA |
4662 | strcmp(filter->table, table->name)) |
4663 | goto cont; | |
d21e540b LZ |
4664 | if (filter && |
4665 | filter->type != NFT_OBJECT_UNSPEC && | |
dfc46034 | 4666 | obj->ops->type->type != filter->type) |
a9fea2a3 PNA |
4667 | goto cont; |
4668 | ||
e5009240 PNA |
4669 | if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, |
4670 | cb->nlh->nlmsg_seq, | |
4671 | NFT_MSG_NEWOBJ, | |
4672 | NLM_F_MULTI | NLM_F_APPEND, | |
43da04a5 | 4673 | afi->family, table, obj, reset) < 0) |
e5009240 PNA |
4674 | goto done; |
4675 | ||
4676 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
4677 | cont: | |
4678 | idx++; | |
4679 | } | |
4680 | } | |
4681 | } | |
4682 | done: | |
4683 | rcu_read_unlock(); | |
4684 | ||
4685 | cb->args[0] = idx; | |
4686 | return skb->len; | |
4687 | } | |
4688 | ||
a9fea2a3 PNA |
4689 | static int nf_tables_dump_obj_done(struct netlink_callback *cb) |
4690 | { | |
e46abbcc PS |
4691 | struct nft_obj_filter *filter = cb->data; |
4692 | ||
8bea728d HL |
4693 | if (filter) { |
4694 | kfree(filter->table); | |
4695 | kfree(filter); | |
4696 | } | |
a9fea2a3 PNA |
4697 | |
4698 | return 0; | |
4699 | } | |
4700 | ||
4701 | static struct nft_obj_filter * | |
4702 | nft_obj_filter_alloc(const struct nlattr * const nla[]) | |
4703 | { | |
4704 | struct nft_obj_filter *filter; | |
4705 | ||
4706 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); | |
4707 | if (!filter) | |
4708 | return ERR_PTR(-ENOMEM); | |
4709 | ||
e46abbcc PS |
4710 | if (nla[NFTA_OBJ_TABLE]) { |
4711 | filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL); | |
4712 | if (!filter->table) { | |
4713 | kfree(filter); | |
4714 | return ERR_PTR(-ENOMEM); | |
4715 | } | |
4716 | } | |
a9fea2a3 PNA |
4717 | if (nla[NFTA_OBJ_TYPE]) |
4718 | filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4719 | ||
4720 | return filter; | |
4721 | } | |
4722 | ||
e5009240 PNA |
4723 | static int nf_tables_getobj(struct net *net, struct sock *nlsk, |
4724 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4725 | const struct nlattr * const nla[], |
4726 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4727 | { |
4728 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4729 | u8 genmask = nft_genmask_cur(net); | |
4730 | int family = nfmsg->nfgen_family; | |
4731 | const struct nft_af_info *afi; | |
4732 | const struct nft_table *table; | |
4733 | struct nft_object *obj; | |
4734 | struct sk_buff *skb2; | |
43da04a5 | 4735 | bool reset = false; |
e5009240 PNA |
4736 | u32 objtype; |
4737 | int err; | |
4738 | ||
4739 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
4740 | struct netlink_dump_control c = { | |
4741 | .dump = nf_tables_dump_obj, | |
a9fea2a3 | 4742 | .done = nf_tables_dump_obj_done, |
e5009240 | 4743 | }; |
a9fea2a3 PNA |
4744 | |
4745 | if (nla[NFTA_OBJ_TABLE] || | |
4746 | nla[NFTA_OBJ_TYPE]) { | |
4747 | struct nft_obj_filter *filter; | |
4748 | ||
4749 | filter = nft_obj_filter_alloc(nla); | |
4750 | if (IS_ERR(filter)) | |
4751 | return -ENOMEM; | |
4752 | ||
4753 | c.data = filter; | |
4754 | } | |
e5009240 PNA |
4755 | return netlink_dump_start(nlsk, skb, nlh, &c); |
4756 | } | |
4757 | ||
4758 | if (!nla[NFTA_OBJ_NAME] || | |
4759 | !nla[NFTA_OBJ_TYPE]) | |
4760 | return -EINVAL; | |
4761 | ||
4762 | afi = nf_tables_afinfo_lookup(net, family, false); | |
4763 | if (IS_ERR(afi)) | |
4764 | return PTR_ERR(afi); | |
4765 | ||
4766 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4767 | if (IS_ERR(table)) | |
4768 | return PTR_ERR(table); | |
4769 | ||
4770 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4771 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4772 | if (IS_ERR(obj)) | |
4773 | return PTR_ERR(obj); | |
4774 | ||
4775 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4776 | if (!skb2) | |
4777 | return -ENOMEM; | |
4778 | ||
43da04a5 PNA |
4779 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) |
4780 | reset = true; | |
4781 | ||
e5009240 PNA |
4782 | err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, |
4783 | nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, | |
43da04a5 | 4784 | family, table, obj, reset); |
e5009240 PNA |
4785 | if (err < 0) |
4786 | goto err; | |
4787 | ||
4788 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4789 | err: | |
4790 | kfree_skb(skb2); | |
4791 | return err; | |
e5009240 PNA |
4792 | } |
4793 | ||
4794 | static void nft_obj_destroy(struct nft_object *obj) | |
4795 | { | |
dfc46034 PBG |
4796 | if (obj->ops->destroy) |
4797 | obj->ops->destroy(obj); | |
e5009240 | 4798 | |
dfc46034 | 4799 | module_put(obj->ops->type->owner); |
61509575 | 4800 | kfree(obj->name); |
e5009240 PNA |
4801 | kfree(obj); |
4802 | } | |
4803 | ||
4804 | static int nf_tables_delobj(struct net *net, struct sock *nlsk, | |
04ba724b PNA |
4805 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
4806 | const struct nlattr * const nla[], | |
4807 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4808 | { |
4809 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4810 | u8 genmask = nft_genmask_next(net); | |
4811 | int family = nfmsg->nfgen_family; | |
4812 | struct nft_af_info *afi; | |
4813 | struct nft_table *table; | |
4814 | struct nft_object *obj; | |
4815 | struct nft_ctx ctx; | |
4816 | u32 objtype; | |
4817 | ||
4818 | if (!nla[NFTA_OBJ_TYPE] || | |
4819 | !nla[NFTA_OBJ_NAME]) | |
4820 | return -EINVAL; | |
4821 | ||
4822 | afi = nf_tables_afinfo_lookup(net, family, true); | |
4823 | if (IS_ERR(afi)) | |
4824 | return PTR_ERR(afi); | |
4825 | ||
4826 | table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask); | |
4827 | if (IS_ERR(table)) | |
4828 | return PTR_ERR(table); | |
4829 | ||
4830 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4831 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4832 | if (IS_ERR(obj)) | |
4833 | return PTR_ERR(obj); | |
4834 | if (obj->use > 0) | |
4835 | return -EBUSY; | |
4836 | ||
4837 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
4838 | ||
4839 | return nft_delobj(&ctx, obj); | |
4840 | } | |
4841 | ||
25e94a99 PNA |
4842 | void nft_obj_notify(struct net *net, struct nft_table *table, |
4843 | struct nft_object *obj, u32 portid, u32 seq, int event, | |
4844 | int family, int report, gfp_t gfp) | |
e5009240 PNA |
4845 | { |
4846 | struct sk_buff *skb; | |
4847 | int err; | |
4848 | ||
2599e989 PNA |
4849 | if (!report && |
4850 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 4851 | return; |
e5009240 | 4852 | |
2599e989 | 4853 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp); |
e5009240 PNA |
4854 | if (skb == NULL) |
4855 | goto err; | |
4856 | ||
2599e989 PNA |
4857 | err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family, |
4858 | table, obj, false); | |
e5009240 PNA |
4859 | if (err < 0) { |
4860 | kfree_skb(skb); | |
4861 | goto err; | |
4862 | } | |
4863 | ||
25e94a99 PNA |
4864 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp); |
4865 | return; | |
e5009240 | 4866 | err: |
25e94a99 | 4867 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
e5009240 | 4868 | } |
2599e989 PNA |
4869 | EXPORT_SYMBOL_GPL(nft_obj_notify); |
4870 | ||
25e94a99 PNA |
4871 | static void nf_tables_obj_notify(const struct nft_ctx *ctx, |
4872 | struct nft_object *obj, int event) | |
2599e989 | 4873 | { |
25e94a99 PNA |
4874 | nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, |
4875 | ctx->afi->family, ctx->report, GFP_KERNEL); | |
2599e989 | 4876 | } |
e5009240 | 4877 | |
3b49e2e9 PNA |
4878 | /* |
4879 | * Flow tables | |
4880 | */ | |
4881 | void nft_register_flowtable_type(struct nf_flowtable_type *type) | |
4882 | { | |
4883 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4884 | list_add_tail_rcu(&type->list, &nf_tables_flowtables); | |
4885 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4886 | } | |
4887 | EXPORT_SYMBOL_GPL(nft_register_flowtable_type); | |
4888 | ||
4889 | void nft_unregister_flowtable_type(struct nf_flowtable_type *type) | |
4890 | { | |
4891 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4892 | list_del_rcu(&type->list); | |
4893 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4894 | } | |
4895 | EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type); | |
4896 | ||
4897 | static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = { | |
4898 | [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING, | |
4899 | .len = NFT_NAME_MAXLEN - 1 }, | |
4900 | [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING, | |
4901 | .len = NFT_NAME_MAXLEN - 1 }, | |
4902 | [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED }, | |
4903 | }; | |
4904 | ||
4905 | struct nft_flowtable *nf_tables_flowtable_lookup(const struct nft_table *table, | |
4906 | const struct nlattr *nla, | |
4907 | u8 genmask) | |
4908 | { | |
4909 | struct nft_flowtable *flowtable; | |
4910 | ||
4911 | list_for_each_entry(flowtable, &table->flowtables, list) { | |
4912 | if (!nla_strcmp(nla, flowtable->name) && | |
4913 | nft_active_genmask(flowtable, genmask)) | |
4914 | return flowtable; | |
4915 | } | |
4916 | return ERR_PTR(-ENOENT); | |
4917 | } | |
4918 | EXPORT_SYMBOL_GPL(nf_tables_flowtable_lookup); | |
4919 | ||
4920 | #define NFT_FLOWTABLE_DEVICE_MAX 8 | |
4921 | ||
4922 | static int nf_tables_parse_devices(const struct nft_ctx *ctx, | |
4923 | const struct nlattr *attr, | |
4924 | struct net_device *dev_array[], int *len) | |
4925 | { | |
4926 | const struct nlattr *tmp; | |
4927 | struct net_device *dev; | |
4928 | char ifname[IFNAMSIZ]; | |
4929 | int rem, n = 0, err; | |
4930 | ||
4931 | nla_for_each_nested(tmp, attr, rem) { | |
4932 | if (nla_type(tmp) != NFTA_DEVICE_NAME) { | |
4933 | err = -EINVAL; | |
4934 | goto err1; | |
4935 | } | |
4936 | ||
4937 | nla_strlcpy(ifname, tmp, IFNAMSIZ); | |
4938 | dev = dev_get_by_name(ctx->net, ifname); | |
4939 | if (!dev) { | |
4940 | err = -ENOENT; | |
4941 | goto err1; | |
4942 | } | |
4943 | ||
4944 | dev_array[n++] = dev; | |
4945 | if (n == NFT_FLOWTABLE_DEVICE_MAX) { | |
4946 | err = -EFBIG; | |
4947 | goto err1; | |
4948 | } | |
4949 | } | |
4950 | if (!len) | |
4951 | return -EINVAL; | |
4952 | ||
4953 | err = 0; | |
4954 | err1: | |
4955 | *len = n; | |
4956 | return err; | |
4957 | } | |
4958 | ||
4959 | static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = { | |
4960 | [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 }, | |
4961 | [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
4962 | [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED }, | |
4963 | }; | |
4964 | ||
4965 | static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx, | |
4966 | const struct nlattr *attr, | |
4967 | struct nft_flowtable *flowtable) | |
4968 | { | |
4969 | struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX]; | |
4970 | struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1]; | |
4971 | struct nf_hook_ops *ops; | |
4972 | int hooknum, priority; | |
4973 | int err, n = 0, i; | |
4974 | ||
4975 | err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr, | |
4976 | nft_flowtable_hook_policy, NULL); | |
4977 | if (err < 0) | |
4978 | return err; | |
4979 | ||
4980 | if (!tb[NFTA_FLOWTABLE_HOOK_NUM] || | |
4981 | !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] || | |
4982 | !tb[NFTA_FLOWTABLE_HOOK_DEVS]) | |
4983 | return -EINVAL; | |
4984 | ||
4985 | hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); | |
fe19c04c | 4986 | if (hooknum != NF_NETDEV_INGRESS) |
3b49e2e9 PNA |
4987 | return -EINVAL; |
4988 | ||
4989 | priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); | |
4990 | ||
4991 | err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS], | |
4992 | dev_array, &n); | |
4993 | if (err < 0) | |
4994 | goto err1; | |
4995 | ||
4996 | ops = kzalloc(sizeof(struct nf_hook_ops) * n, GFP_KERNEL); | |
4997 | if (!ops) { | |
4998 | err = -ENOMEM; | |
4999 | goto err1; | |
5000 | } | |
5001 | ||
5002 | flowtable->ops = ops; | |
5003 | flowtable->ops_len = n; | |
5004 | ||
5005 | for (i = 0; i < n; i++) { | |
5006 | flowtable->ops[i].pf = NFPROTO_NETDEV; | |
5007 | flowtable->ops[i].hooknum = hooknum; | |
5008 | flowtable->ops[i].priority = priority; | |
5009 | flowtable->ops[i].priv = &flowtable->data.rhashtable; | |
5010 | flowtable->ops[i].hook = flowtable->data.type->hook; | |
5011 | flowtable->ops[i].dev = dev_array[i]; | |
5012 | } | |
5013 | ||
5014 | err = 0; | |
5015 | err1: | |
5016 | for (i = 0; i < n; i++) | |
5017 | dev_put(dev_array[i]); | |
5018 | ||
5019 | return err; | |
5020 | } | |
5021 | ||
5022 | static const struct nf_flowtable_type * | |
5023 | __nft_flowtable_type_get(const struct nft_af_info *afi) | |
5024 | { | |
5025 | const struct nf_flowtable_type *type; | |
5026 | ||
5027 | list_for_each_entry(type, &nf_tables_flowtables, list) { | |
5028 | if (afi->family == type->family) | |
5029 | return type; | |
5030 | } | |
5031 | return NULL; | |
5032 | } | |
5033 | ||
5034 | static const struct nf_flowtable_type * | |
5035 | nft_flowtable_type_get(const struct nft_af_info *afi) | |
5036 | { | |
5037 | const struct nf_flowtable_type *type; | |
5038 | ||
5039 | type = __nft_flowtable_type_get(afi); | |
5040 | if (type != NULL && try_module_get(type->owner)) | |
5041 | return type; | |
5042 | ||
5043 | #ifdef CONFIG_MODULES | |
5044 | if (type == NULL) { | |
5045 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
5046 | request_module("nf-flowtable-%u", afi->family); | |
5047 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
5048 | if (__nft_flowtable_type_get(afi)) | |
5049 | return ERR_PTR(-EAGAIN); | |
5050 | } | |
5051 | #endif | |
5052 | return ERR_PTR(-ENOENT); | |
5053 | } | |
5054 | ||
5055 | void nft_flow_table_iterate(struct net *net, | |
5056 | void (*iter)(struct nf_flowtable *flowtable, void *data), | |
5057 | void *data) | |
5058 | { | |
5059 | struct nft_flowtable *flowtable; | |
5060 | const struct nft_af_info *afi; | |
5061 | const struct nft_table *table; | |
5062 | ||
5063 | rcu_read_lock(); | |
5064 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
5065 | list_for_each_entry_rcu(table, &afi->tables, list) { | |
5066 | list_for_each_entry_rcu(flowtable, &table->flowtables, list) { | |
5067 | iter(&flowtable->data, data); | |
5068 | } | |
5069 | } | |
5070 | } | |
5071 | rcu_read_unlock(); | |
5072 | } | |
5073 | EXPORT_SYMBOL_GPL(nft_flow_table_iterate); | |
5074 | ||
5075 | static void nft_unregister_flowtable_net_hooks(struct net *net, | |
5076 | struct nft_flowtable *flowtable) | |
5077 | { | |
5078 | int i; | |
5079 | ||
5080 | for (i = 0; i < flowtable->ops_len; i++) { | |
5081 | if (!flowtable->ops[i].dev) | |
5082 | continue; | |
5083 | ||
5084 | nf_unregister_net_hook(net, &flowtable->ops[i]); | |
5085 | } | |
5086 | } | |
5087 | ||
5088 | static int nf_tables_newflowtable(struct net *net, struct sock *nlsk, | |
5089 | struct sk_buff *skb, | |
5090 | const struct nlmsghdr *nlh, | |
5091 | const struct nlattr * const nla[], | |
5092 | struct netlink_ext_ack *extack) | |
5093 | { | |
5094 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5095 | const struct nf_flowtable_type *type; | |
5096 | u8 genmask = nft_genmask_next(net); | |
5097 | int family = nfmsg->nfgen_family; | |
5098 | struct nft_flowtable *flowtable; | |
5099 | struct nft_af_info *afi; | |
5100 | struct nft_table *table; | |
5101 | struct nft_ctx ctx; | |
5102 | int err, i, k; | |
5103 | ||
5104 | if (!nla[NFTA_FLOWTABLE_TABLE] || | |
5105 | !nla[NFTA_FLOWTABLE_NAME] || | |
5106 | !nla[NFTA_FLOWTABLE_HOOK]) | |
5107 | return -EINVAL; | |
5108 | ||
5109 | afi = nf_tables_afinfo_lookup(net, family, true); | |
5110 | if (IS_ERR(afi)) | |
5111 | return PTR_ERR(afi); | |
5112 | ||
5113 | table = nf_tables_table_lookup(afi, nla[NFTA_FLOWTABLE_TABLE], genmask); | |
5114 | if (IS_ERR(table)) | |
5115 | return PTR_ERR(table); | |
5116 | ||
5117 | flowtable = nf_tables_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], | |
5118 | genmask); | |
5119 | if (IS_ERR(flowtable)) { | |
5120 | err = PTR_ERR(flowtable); | |
5121 | if (err != -ENOENT) | |
5122 | return err; | |
5123 | } else { | |
5124 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
5125 | return -EEXIST; | |
5126 | ||
5127 | return 0; | |
5128 | } | |
5129 | ||
5130 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
5131 | ||
5132 | flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL); | |
5133 | if (!flowtable) | |
5134 | return -ENOMEM; | |
5135 | ||
5136 | flowtable->table = table; | |
5137 | flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL); | |
5138 | if (!flowtable->name) { | |
5139 | err = -ENOMEM; | |
5140 | goto err1; | |
5141 | } | |
5142 | ||
5143 | type = nft_flowtable_type_get(afi); | |
5144 | if (IS_ERR(type)) { | |
5145 | err = PTR_ERR(type); | |
5146 | goto err2; | |
5147 | } | |
5148 | ||
5149 | flowtable->data.type = type; | |
5150 | err = rhashtable_init(&flowtable->data.rhashtable, type->params); | |
5151 | if (err < 0) | |
5152 | goto err3; | |
5153 | ||
5154 | err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK], | |
5155 | flowtable); | |
5156 | if (err < 0) | |
5157 | goto err3; | |
5158 | ||
5159 | for (i = 0; i < flowtable->ops_len; i++) { | |
5160 | err = nf_register_net_hook(net, &flowtable->ops[i]); | |
5161 | if (err < 0) | |
5162 | goto err4; | |
5163 | } | |
5164 | ||
5165 | err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable); | |
5166 | if (err < 0) | |
5167 | goto err5; | |
5168 | ||
5169 | INIT_DEFERRABLE_WORK(&flowtable->data.gc_work, type->gc); | |
5170 | queue_delayed_work(system_power_efficient_wq, | |
5171 | &flowtable->data.gc_work, HZ); | |
5172 | ||
5173 | list_add_tail_rcu(&flowtable->list, &table->flowtables); | |
5174 | table->use++; | |
5175 | ||
5176 | return 0; | |
5177 | err5: | |
5178 | i = flowtable->ops_len; | |
5179 | err4: | |
5180 | for (k = i - 1; k >= 0; k--) | |
5181 | nf_unregister_net_hook(net, &flowtable->ops[i]); | |
5182 | ||
5183 | kfree(flowtable->ops); | |
5184 | err3: | |
5185 | module_put(type->owner); | |
5186 | err2: | |
5187 | kfree(flowtable->name); | |
5188 | err1: | |
5189 | kfree(flowtable); | |
5190 | return err; | |
5191 | } | |
5192 | ||
5193 | static int nf_tables_delflowtable(struct net *net, struct sock *nlsk, | |
5194 | struct sk_buff *skb, | |
5195 | const struct nlmsghdr *nlh, | |
5196 | const struct nlattr * const nla[], | |
5197 | struct netlink_ext_ack *extack) | |
5198 | { | |
5199 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5200 | u8 genmask = nft_genmask_next(net); | |
5201 | int family = nfmsg->nfgen_family; | |
5202 | struct nft_flowtable *flowtable; | |
5203 | struct nft_af_info *afi; | |
5204 | struct nft_table *table; | |
5205 | struct nft_ctx ctx; | |
5206 | ||
5207 | afi = nf_tables_afinfo_lookup(net, family, true); | |
5208 | if (IS_ERR(afi)) | |
5209 | return PTR_ERR(afi); | |
5210 | ||
5211 | table = nf_tables_table_lookup(afi, nla[NFTA_FLOWTABLE_TABLE], genmask); | |
5212 | if (IS_ERR(table)) | |
5213 | return PTR_ERR(table); | |
5214 | ||
5215 | flowtable = nf_tables_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], | |
5216 | genmask); | |
5217 | if (IS_ERR(flowtable)) | |
5218 | return PTR_ERR(flowtable); | |
5219 | if (flowtable->use > 0) | |
5220 | return -EBUSY; | |
5221 | ||
5222 | nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); | |
5223 | ||
5224 | return nft_delflowtable(&ctx, flowtable); | |
5225 | } | |
5226 | ||
5227 | static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net, | |
5228 | u32 portid, u32 seq, int event, | |
5229 | u32 flags, int family, | |
5230 | struct nft_flowtable *flowtable) | |
5231 | { | |
5232 | struct nlattr *nest, *nest_devs; | |
5233 | struct nfgenmsg *nfmsg; | |
5234 | struct nlmsghdr *nlh; | |
5235 | int i; | |
5236 | ||
5237 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); | |
5238 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
5239 | if (nlh == NULL) | |
5240 | goto nla_put_failure; | |
5241 | ||
5242 | nfmsg = nlmsg_data(nlh); | |
5243 | nfmsg->nfgen_family = family; | |
5244 | nfmsg->version = NFNETLINK_V0; | |
5245 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
5246 | ||
5247 | if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) || | |
5248 | nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) || | |
5249 | nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use))) | |
5250 | goto nla_put_failure; | |
5251 | ||
5252 | nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK); | |
5253 | if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) || | |
5254 | nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority))) | |
5255 | goto nla_put_failure; | |
5256 | ||
5257 | nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS); | |
5258 | if (!nest_devs) | |
5259 | goto nla_put_failure; | |
5260 | ||
5261 | for (i = 0; i < flowtable->ops_len; i++) { | |
5262 | if (flowtable->ops[i].dev && | |
5263 | nla_put_string(skb, NFTA_DEVICE_NAME, | |
5264 | flowtable->ops[i].dev->name)) | |
5265 | goto nla_put_failure; | |
5266 | } | |
5267 | nla_nest_end(skb, nest_devs); | |
5268 | nla_nest_end(skb, nest); | |
5269 | ||
5270 | nlmsg_end(skb, nlh); | |
5271 | return 0; | |
5272 | ||
5273 | nla_put_failure: | |
5274 | nlmsg_trim(skb, nlh); | |
5275 | return -1; | |
5276 | } | |
5277 | ||
5278 | struct nft_flowtable_filter { | |
5279 | char *table; | |
5280 | }; | |
5281 | ||
5282 | static int nf_tables_dump_flowtable(struct sk_buff *skb, | |
5283 | struct netlink_callback *cb) | |
5284 | { | |
5285 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
5286 | struct nft_flowtable_filter *filter = cb->data; | |
5287 | unsigned int idx = 0, s_idx = cb->args[0]; | |
5288 | struct net *net = sock_net(skb->sk); | |
5289 | int family = nfmsg->nfgen_family; | |
5290 | struct nft_flowtable *flowtable; | |
5291 | const struct nft_af_info *afi; | |
5292 | const struct nft_table *table; | |
5293 | ||
5294 | rcu_read_lock(); | |
5295 | cb->seq = net->nft.base_seq; | |
5296 | ||
5297 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { | |
5298 | if (family != NFPROTO_UNSPEC && family != afi->family) | |
5299 | continue; | |
5300 | ||
5301 | list_for_each_entry_rcu(table, &afi->tables, list) { | |
5302 | list_for_each_entry_rcu(flowtable, &table->flowtables, list) { | |
5303 | if (!nft_is_active(net, flowtable)) | |
5304 | goto cont; | |
5305 | if (idx < s_idx) | |
5306 | goto cont; | |
5307 | if (idx > s_idx) | |
5308 | memset(&cb->args[1], 0, | |
5309 | sizeof(cb->args) - sizeof(cb->args[0])); | |
5310 | if (filter && filter->table[0] && | |
5311 | strcmp(filter->table, table->name)) | |
5312 | goto cont; | |
5313 | ||
5314 | if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid, | |
5315 | cb->nlh->nlmsg_seq, | |
5316 | NFT_MSG_NEWFLOWTABLE, | |
5317 | NLM_F_MULTI | NLM_F_APPEND, | |
5318 | afi->family, flowtable) < 0) | |
5319 | goto done; | |
5320 | ||
5321 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
5322 | cont: | |
5323 | idx++; | |
5324 | } | |
5325 | } | |
5326 | } | |
5327 | done: | |
5328 | rcu_read_unlock(); | |
5329 | ||
5330 | cb->args[0] = idx; | |
5331 | return skb->len; | |
5332 | } | |
5333 | ||
5334 | static int nf_tables_dump_flowtable_done(struct netlink_callback *cb) | |
5335 | { | |
5336 | struct nft_flowtable_filter *filter = cb->data; | |
5337 | ||
5338 | if (!filter) | |
5339 | return 0; | |
5340 | ||
5341 | kfree(filter->table); | |
5342 | kfree(filter); | |
5343 | ||
5344 | return 0; | |
5345 | } | |
5346 | ||
5347 | static struct nft_flowtable_filter * | |
5348 | nft_flowtable_filter_alloc(const struct nlattr * const nla[]) | |
5349 | { | |
5350 | struct nft_flowtable_filter *filter; | |
5351 | ||
5352 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); | |
5353 | if (!filter) | |
5354 | return ERR_PTR(-ENOMEM); | |
5355 | ||
5356 | if (nla[NFTA_FLOWTABLE_TABLE]) { | |
5357 | filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE], | |
5358 | GFP_KERNEL); | |
5359 | if (!filter->table) { | |
5360 | kfree(filter); | |
5361 | return ERR_PTR(-ENOMEM); | |
5362 | } | |
5363 | } | |
5364 | return filter; | |
5365 | } | |
5366 | ||
5367 | static int nf_tables_getflowtable(struct net *net, struct sock *nlsk, | |
5368 | struct sk_buff *skb, | |
5369 | const struct nlmsghdr *nlh, | |
5370 | const struct nlattr * const nla[], | |
5371 | struct netlink_ext_ack *extack) | |
5372 | { | |
5373 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5374 | u8 genmask = nft_genmask_cur(net); | |
5375 | int family = nfmsg->nfgen_family; | |
5376 | struct nft_flowtable *flowtable; | |
5377 | const struct nft_af_info *afi; | |
5378 | const struct nft_table *table; | |
5379 | struct sk_buff *skb2; | |
5380 | int err; | |
5381 | ||
5382 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
5383 | struct netlink_dump_control c = { | |
5384 | .dump = nf_tables_dump_flowtable, | |
5385 | .done = nf_tables_dump_flowtable_done, | |
5386 | }; | |
5387 | ||
5388 | if (nla[NFTA_FLOWTABLE_TABLE]) { | |
5389 | struct nft_flowtable_filter *filter; | |
5390 | ||
5391 | filter = nft_flowtable_filter_alloc(nla); | |
5392 | if (IS_ERR(filter)) | |
5393 | return -ENOMEM; | |
5394 | ||
5395 | c.data = filter; | |
5396 | } | |
5397 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
5398 | } | |
5399 | ||
5400 | if (!nla[NFTA_FLOWTABLE_NAME]) | |
5401 | return -EINVAL; | |
5402 | ||
5403 | afi = nf_tables_afinfo_lookup(net, family, false); | |
5404 | if (IS_ERR(afi)) | |
5405 | return PTR_ERR(afi); | |
5406 | ||
5407 | table = nf_tables_table_lookup(afi, nla[NFTA_FLOWTABLE_TABLE], genmask); | |
5408 | if (IS_ERR(table)) | |
5409 | return PTR_ERR(table); | |
5410 | ||
5411 | flowtable = nf_tables_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], | |
5412 | genmask); | |
5413 | if (IS_ERR(table)) | |
5414 | return PTR_ERR(flowtable); | |
5415 | ||
5416 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
5417 | if (!skb2) | |
5418 | return -ENOMEM; | |
5419 | ||
5420 | err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid, | |
5421 | nlh->nlmsg_seq, | |
5422 | NFT_MSG_NEWFLOWTABLE, 0, family, | |
5423 | flowtable); | |
5424 | if (err < 0) | |
5425 | goto err; | |
5426 | ||
5427 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5428 | err: | |
5429 | kfree_skb(skb2); | |
5430 | return err; | |
5431 | } | |
5432 | ||
5433 | static void nf_tables_flowtable_notify(struct nft_ctx *ctx, | |
5434 | struct nft_flowtable *flowtable, | |
5435 | int event) | |
5436 | { | |
5437 | struct sk_buff *skb; | |
5438 | int err; | |
5439 | ||
5440 | if (ctx->report && | |
5441 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
5442 | return; | |
5443 | ||
5444 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
5445 | if (skb == NULL) | |
5446 | goto err; | |
5447 | ||
5448 | err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid, | |
5449 | ctx->seq, event, 0, | |
5450 | ctx->afi->family, flowtable); | |
5451 | if (err < 0) { | |
5452 | kfree_skb(skb); | |
5453 | goto err; | |
5454 | } | |
5455 | ||
5456 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
5457 | ctx->report, GFP_KERNEL); | |
5458 | return; | |
5459 | err: | |
5460 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); | |
5461 | } | |
5462 | ||
5463 | static void nft_flowtable_destroy(void *ptr, void *arg) | |
5464 | { | |
5465 | kfree(ptr); | |
5466 | } | |
5467 | ||
5468 | static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable) | |
5469 | { | |
5470 | cancel_delayed_work_sync(&flowtable->data.gc_work); | |
5471 | kfree(flowtable->name); | |
5472 | rhashtable_free_and_destroy(&flowtable->data.rhashtable, | |
5473 | nft_flowtable_destroy, NULL); | |
5474 | module_put(flowtable->data.type->owner); | |
5475 | } | |
5476 | ||
84d7fce6 PNA |
5477 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
5478 | u32 portid, u32 seq) | |
5479 | { | |
5480 | struct nlmsghdr *nlh; | |
5481 | struct nfgenmsg *nfmsg; | |
784b4e61 | 5482 | char buf[TASK_COMM_LEN]; |
dedb67c4 | 5483 | int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); |
84d7fce6 PNA |
5484 | |
5485 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
5486 | if (nlh == NULL) | |
5487 | goto nla_put_failure; | |
5488 | ||
5489 | nfmsg = nlmsg_data(nlh); | |
5490 | nfmsg->nfgen_family = AF_UNSPEC; | |
5491 | nfmsg->version = NFNETLINK_V0; | |
5492 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
5493 | ||
784b4e61 PS |
5494 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) || |
5495 | nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) || | |
5496 | nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current))) | |
84d7fce6 PNA |
5497 | goto nla_put_failure; |
5498 | ||
053c095a JB |
5499 | nlmsg_end(skb, nlh); |
5500 | return 0; | |
84d7fce6 PNA |
5501 | |
5502 | nla_put_failure: | |
5503 | nlmsg_trim(skb, nlh); | |
5504 | return -EMSGSIZE; | |
5505 | } | |
5506 | ||
3b49e2e9 PNA |
5507 | static void nft_flowtable_event(unsigned long event, struct net_device *dev, |
5508 | struct nft_flowtable *flowtable) | |
5509 | { | |
5510 | int i; | |
5511 | ||
5512 | for (i = 0; i < flowtable->ops_len; i++) { | |
5513 | if (flowtable->ops[i].dev != dev) | |
5514 | continue; | |
5515 | ||
5516 | nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]); | |
5517 | flowtable->ops[i].dev = NULL; | |
5518 | break; | |
5519 | } | |
5520 | } | |
5521 | ||
5522 | static int nf_tables_flowtable_event(struct notifier_block *this, | |
5523 | unsigned long event, void *ptr) | |
5524 | { | |
5525 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
5526 | struct nft_flowtable *flowtable; | |
5527 | struct nft_table *table; | |
5528 | struct nft_af_info *afi; | |
5529 | ||
5530 | if (event != NETDEV_UNREGISTER) | |
5531 | return 0; | |
5532 | ||
5533 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
5534 | list_for_each_entry(afi, &dev_net(dev)->nft.af_info, list) { | |
5535 | list_for_each_entry(table, &afi->tables, list) { | |
5536 | list_for_each_entry(flowtable, &table->flowtables, list) { | |
5537 | nft_flowtable_event(event, dev, flowtable); | |
5538 | } | |
5539 | } | |
5540 | } | |
5541 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
5542 | ||
5543 | return NOTIFY_DONE; | |
5544 | } | |
5545 | ||
5546 | static struct notifier_block nf_tables_flowtable_notifier = { | |
5547 | .notifier_call = nf_tables_flowtable_event, | |
5548 | }; | |
5549 | ||
25e94a99 PNA |
5550 | static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, |
5551 | int event) | |
84d7fce6 PNA |
5552 | { |
5553 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
5554 | struct sk_buff *skb2; | |
5555 | int err; | |
5556 | ||
5557 | if (nlmsg_report(nlh) && | |
5558 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 5559 | return; |
84d7fce6 | 5560 | |
84d7fce6 PNA |
5561 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
5562 | if (skb2 == NULL) | |
5563 | goto err; | |
5564 | ||
5565 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
5566 | nlh->nlmsg_seq); | |
5567 | if (err < 0) { | |
5568 | kfree_skb(skb2); | |
5569 | goto err; | |
5570 | } | |
5571 | ||
25e94a99 PNA |
5572 | nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
5573 | nlmsg_report(nlh), GFP_KERNEL); | |
5574 | return; | |
84d7fce6 | 5575 | err: |
25e94a99 PNA |
5576 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
5577 | -ENOBUFS); | |
84d7fce6 PNA |
5578 | } |
5579 | ||
7b8002a1 PNA |
5580 | static int nf_tables_getgen(struct net *net, struct sock *nlsk, |
5581 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
5582 | const struct nlattr * const nla[], |
5583 | struct netlink_ext_ack *extack) | |
84d7fce6 | 5584 | { |
84d7fce6 PNA |
5585 | struct sk_buff *skb2; |
5586 | int err; | |
5587 | ||
5588 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
5589 | if (skb2 == NULL) | |
5590 | return -ENOMEM; | |
5591 | ||
5592 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
5593 | nlh->nlmsg_seq); | |
5594 | if (err < 0) | |
5595 | goto err; | |
5596 | ||
5597 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5598 | err: | |
5599 | kfree_skb(skb2); | |
5600 | return err; | |
5601 | } | |
5602 | ||
96518518 PM |
5603 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
5604 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 5605 | .call_batch = nf_tables_newtable, |
96518518 PM |
5606 | .attr_count = NFTA_TABLE_MAX, |
5607 | .policy = nft_table_policy, | |
5608 | }, | |
5609 | [NFT_MSG_GETTABLE] = { | |
5610 | .call = nf_tables_gettable, | |
5611 | .attr_count = NFTA_TABLE_MAX, | |
5612 | .policy = nft_table_policy, | |
5613 | }, | |
5614 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 5615 | .call_batch = nf_tables_deltable, |
96518518 PM |
5616 | .attr_count = NFTA_TABLE_MAX, |
5617 | .policy = nft_table_policy, | |
5618 | }, | |
5619 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 5620 | .call_batch = nf_tables_newchain, |
96518518 PM |
5621 | .attr_count = NFTA_CHAIN_MAX, |
5622 | .policy = nft_chain_policy, | |
5623 | }, | |
5624 | [NFT_MSG_GETCHAIN] = { | |
5625 | .call = nf_tables_getchain, | |
5626 | .attr_count = NFTA_CHAIN_MAX, | |
5627 | .policy = nft_chain_policy, | |
5628 | }, | |
5629 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 5630 | .call_batch = nf_tables_delchain, |
96518518 PM |
5631 | .attr_count = NFTA_CHAIN_MAX, |
5632 | .policy = nft_chain_policy, | |
5633 | }, | |
5634 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 5635 | .call_batch = nf_tables_newrule, |
96518518 PM |
5636 | .attr_count = NFTA_RULE_MAX, |
5637 | .policy = nft_rule_policy, | |
5638 | }, | |
5639 | [NFT_MSG_GETRULE] = { | |
5640 | .call = nf_tables_getrule, | |
5641 | .attr_count = NFTA_RULE_MAX, | |
5642 | .policy = nft_rule_policy, | |
5643 | }, | |
5644 | [NFT_MSG_DELRULE] = { | |
0628b123 | 5645 | .call_batch = nf_tables_delrule, |
96518518 PM |
5646 | .attr_count = NFTA_RULE_MAX, |
5647 | .policy = nft_rule_policy, | |
5648 | }, | |
20a69341 | 5649 | [NFT_MSG_NEWSET] = { |
958bee14 | 5650 | .call_batch = nf_tables_newset, |
20a69341 PM |
5651 | .attr_count = NFTA_SET_MAX, |
5652 | .policy = nft_set_policy, | |
5653 | }, | |
5654 | [NFT_MSG_GETSET] = { | |
5655 | .call = nf_tables_getset, | |
5656 | .attr_count = NFTA_SET_MAX, | |
5657 | .policy = nft_set_policy, | |
5658 | }, | |
5659 | [NFT_MSG_DELSET] = { | |
958bee14 | 5660 | .call_batch = nf_tables_delset, |
20a69341 PM |
5661 | .attr_count = NFTA_SET_MAX, |
5662 | .policy = nft_set_policy, | |
5663 | }, | |
5664 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 5665 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
5666 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
5667 | .policy = nft_set_elem_list_policy, | |
5668 | }, | |
5669 | [NFT_MSG_GETSETELEM] = { | |
5670 | .call = nf_tables_getsetelem, | |
5671 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
5672 | .policy = nft_set_elem_list_policy, | |
5673 | }, | |
5674 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 5675 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
5676 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
5677 | .policy = nft_set_elem_list_policy, | |
5678 | }, | |
84d7fce6 PNA |
5679 | [NFT_MSG_GETGEN] = { |
5680 | .call = nf_tables_getgen, | |
5681 | }, | |
e5009240 PNA |
5682 | [NFT_MSG_NEWOBJ] = { |
5683 | .call_batch = nf_tables_newobj, | |
5684 | .attr_count = NFTA_OBJ_MAX, | |
5685 | .policy = nft_obj_policy, | |
5686 | }, | |
5687 | [NFT_MSG_GETOBJ] = { | |
5688 | .call = nf_tables_getobj, | |
5689 | .attr_count = NFTA_OBJ_MAX, | |
5690 | .policy = nft_obj_policy, | |
5691 | }, | |
5692 | [NFT_MSG_DELOBJ] = { | |
5693 | .call_batch = nf_tables_delobj, | |
5694 | .attr_count = NFTA_OBJ_MAX, | |
5695 | .policy = nft_obj_policy, | |
5696 | }, | |
43da04a5 PNA |
5697 | [NFT_MSG_GETOBJ_RESET] = { |
5698 | .call = nf_tables_getobj, | |
5699 | .attr_count = NFTA_OBJ_MAX, | |
5700 | .policy = nft_obj_policy, | |
5701 | }, | |
3b49e2e9 PNA |
5702 | [NFT_MSG_NEWFLOWTABLE] = { |
5703 | .call_batch = nf_tables_newflowtable, | |
5704 | .attr_count = NFTA_FLOWTABLE_MAX, | |
5705 | .policy = nft_flowtable_policy, | |
5706 | }, | |
5707 | [NFT_MSG_GETFLOWTABLE] = { | |
5708 | .call = nf_tables_getflowtable, | |
5709 | .attr_count = NFTA_FLOWTABLE_MAX, | |
5710 | .policy = nft_flowtable_policy, | |
5711 | }, | |
5712 | [NFT_MSG_DELFLOWTABLE] = { | |
5713 | .call_batch = nf_tables_delflowtable, | |
5714 | .attr_count = NFTA_FLOWTABLE_MAX, | |
5715 | .policy = nft_flowtable_policy, | |
5716 | }, | |
96518518 PM |
5717 | }; |
5718 | ||
91c7b38d PNA |
5719 | static void nft_chain_commit_update(struct nft_trans *trans) |
5720 | { | |
5721 | struct nft_base_chain *basechain; | |
5722 | ||
b7263e07 | 5723 | if (nft_trans_chain_name(trans)) |
91c7b38d PNA |
5724 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); |
5725 | ||
f323d954 | 5726 | if (!nft_is_base_chain(trans->ctx.chain)) |
91c7b38d PNA |
5727 | return; |
5728 | ||
5729 | basechain = nft_base_chain(trans->ctx.chain); | |
5730 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
5731 | ||
5732 | switch (nft_trans_chain_policy(trans)) { | |
5733 | case NF_DROP: | |
5734 | case NF_ACCEPT: | |
5735 | basechain->policy = nft_trans_chain_policy(trans); | |
5736 | break; | |
5737 | } | |
5738 | } | |
5739 | ||
b326dd37 | 5740 | static void nf_tables_commit_release(struct nft_trans *trans) |
c7c32e72 | 5741 | { |
c7c32e72 PNA |
5742 | switch (trans->msg_type) { |
5743 | case NFT_MSG_DELTABLE: | |
5744 | nf_tables_table_destroy(&trans->ctx); | |
5745 | break; | |
5746 | case NFT_MSG_DELCHAIN: | |
5747 | nf_tables_chain_destroy(trans->ctx.chain); | |
5748 | break; | |
5749 | case NFT_MSG_DELRULE: | |
5750 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
5751 | break; | |
5752 | case NFT_MSG_DELSET: | |
5753 | nft_set_destroy(nft_trans_set(trans)); | |
5754 | break; | |
61edafbb | 5755 | case NFT_MSG_DELSETELEM: |
59105446 PNA |
5756 | nf_tables_set_elem_destroy(nft_trans_elem_set(trans), |
5757 | nft_trans_elem(trans).priv); | |
61edafbb | 5758 | break; |
e5009240 PNA |
5759 | case NFT_MSG_DELOBJ: |
5760 | nft_obj_destroy(nft_trans_obj(trans)); | |
5761 | break; | |
3b49e2e9 PNA |
5762 | case NFT_MSG_DELFLOWTABLE: |
5763 | nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); | |
5764 | break; | |
c7c32e72 PNA |
5765 | } |
5766 | kfree(trans); | |
5767 | } | |
5768 | ||
5913beaf | 5769 | static int nf_tables_commit(struct net *net, struct sk_buff *skb) |
37082f93 | 5770 | { |
37082f93 | 5771 | struct nft_trans *trans, *next; |
a3716e70 | 5772 | struct nft_trans_elem *te; |
37082f93 PNA |
5773 | |
5774 | /* Bump generation counter, invalidate any dump in progress */ | |
38e029f1 | 5775 | while (++net->nft.base_seq == 0); |
37082f93 PNA |
5776 | |
5777 | /* A new generation has just started */ | |
ea4bd995 | 5778 | net->nft.gencursor = nft_gencursor_next(net); |
37082f93 PNA |
5779 | |
5780 | /* Make sure all packets have left the previous generation before | |
5781 | * purging old rules. | |
5782 | */ | |
5783 | synchronize_rcu(); | |
5784 | ||
5785 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 5786 | switch (trans->msg_type) { |
55dd6f93 PNA |
5787 | case NFT_MSG_NEWTABLE: |
5788 | if (nft_trans_table_update(trans)) { | |
5789 | if (!nft_trans_table_enable(trans)) { | |
664b0f8c | 5790 | nf_tables_table_disable(net, |
55dd6f93 PNA |
5791 | trans->ctx.table); |
5792 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
5793 | } | |
5794 | } else { | |
f2a6d766 | 5795 | nft_clear(net, trans->ctx.table); |
55dd6f93 | 5796 | } |
35151d84 | 5797 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
5798 | nft_trans_destroy(trans); |
5799 | break; | |
5800 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 5801 | list_del_rcu(&trans->ctx.table->list); |
35151d84 | 5802 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 5803 | break; |
91c7b38d PNA |
5804 | case NFT_MSG_NEWCHAIN: |
5805 | if (nft_trans_chain_update(trans)) | |
5806 | nft_chain_commit_update(trans); | |
4fefee57 | 5807 | else |
664b0f8c | 5808 | nft_clear(net, trans->ctx.chain); |
4fefee57 | 5809 | |
35151d84 | 5810 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
5811 | nft_trans_destroy(trans); |
5812 | break; | |
5813 | case NFT_MSG_DELCHAIN: | |
664b0f8c | 5814 | list_del_rcu(&trans->ctx.chain->list); |
35151d84 | 5815 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
c974a3a3 PNA |
5816 | nf_tables_unregister_hook(trans->ctx.net, |
5817 | trans->ctx.table, | |
5818 | trans->ctx.chain); | |
91c7b38d | 5819 | break; |
b380e5c7 | 5820 | case NFT_MSG_NEWRULE: |
889f7ee7 | 5821 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
35151d84 | 5822 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 5823 | nft_trans_rule(trans), |
35151d84 | 5824 | NFT_MSG_NEWRULE); |
37082f93 | 5825 | nft_trans_destroy(trans); |
b380e5c7 PNA |
5826 | break; |
5827 | case NFT_MSG_DELRULE: | |
5828 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
5829 | nf_tables_rule_notify(&trans->ctx, |
5830 | nft_trans_rule(trans), | |
5831 | NFT_MSG_DELRULE); | |
b380e5c7 | 5832 | break; |
958bee14 | 5833 | case NFT_MSG_NEWSET: |
37a9cc52 | 5834 | nft_clear(net, nft_trans_set(trans)); |
4fefee57 PNA |
5835 | /* This avoids hitting -EBUSY when deleting the table |
5836 | * from the transaction. | |
5837 | */ | |
408070d6 | 5838 | if (nft_set_is_anonymous(nft_trans_set(trans)) && |
4fefee57 PNA |
5839 | !list_empty(&nft_trans_set(trans)->bindings)) |
5840 | trans->ctx.table->use--; | |
5841 | ||
958bee14 | 5842 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 5843 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
5844 | nft_trans_destroy(trans); |
5845 | break; | |
5846 | case NFT_MSG_DELSET: | |
37a9cc52 | 5847 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 | 5848 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 5849 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 5850 | break; |
60319eb1 | 5851 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
5852 | te = (struct nft_trans_elem *)trans->data; |
5853 | ||
42a55769 | 5854 | te->set->ops->activate(net, te->set, &te->elem); |
cc02e457 PM |
5855 | nf_tables_setelem_notify(&trans->ctx, te->set, |
5856 | &te->elem, | |
60319eb1 PNA |
5857 | NFT_MSG_NEWSETELEM, 0); |
5858 | nft_trans_destroy(trans); | |
5859 | break; | |
5860 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 5861 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 5862 | |
a3716e70 PNA |
5863 | nf_tables_setelem_notify(&trans->ctx, te->set, |
5864 | &te->elem, | |
60319eb1 | 5865 | NFT_MSG_DELSETELEM, 0); |
5cb82a38 | 5866 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a PM |
5867 | atomic_dec(&te->set->nelems); |
5868 | te->set->ndeact--; | |
60319eb1 | 5869 | break; |
e5009240 PNA |
5870 | case NFT_MSG_NEWOBJ: |
5871 | nft_clear(net, nft_trans_obj(trans)); | |
5872 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
5873 | NFT_MSG_NEWOBJ); | |
5874 | nft_trans_destroy(trans); | |
5875 | break; | |
5876 | case NFT_MSG_DELOBJ: | |
5877 | list_del_rcu(&nft_trans_obj(trans)->list); | |
5878 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
5879 | NFT_MSG_DELOBJ); | |
5880 | break; | |
3b49e2e9 PNA |
5881 | case NFT_MSG_NEWFLOWTABLE: |
5882 | nft_clear(net, nft_trans_flowtable(trans)); | |
5883 | nf_tables_flowtable_notify(&trans->ctx, | |
5884 | nft_trans_flowtable(trans), | |
5885 | NFT_MSG_NEWFLOWTABLE); | |
5886 | nft_trans_destroy(trans); | |
5887 | break; | |
5888 | case NFT_MSG_DELFLOWTABLE: | |
5889 | list_del_rcu(&nft_trans_flowtable(trans)->list); | |
5890 | nf_tables_flowtable_notify(&trans->ctx, | |
5891 | nft_trans_flowtable(trans), | |
5892 | NFT_MSG_DELFLOWTABLE); | |
5893 | nft_unregister_flowtable_net_hooks(net, | |
5894 | nft_trans_flowtable(trans)); | |
5895 | break; | |
37082f93 | 5896 | } |
37082f93 PNA |
5897 | } |
5898 | ||
b326dd37 PNA |
5899 | synchronize_rcu(); |
5900 | ||
37082f93 | 5901 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 | 5902 | list_del(&trans->list); |
b326dd37 | 5903 | nf_tables_commit_release(trans); |
37082f93 | 5904 | } |
84d7fce6 PNA |
5905 | |
5906 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); | |
37082f93 PNA |
5907 | |
5908 | return 0; | |
5909 | } | |
5910 | ||
b326dd37 | 5911 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 5912 | { |
c7c32e72 PNA |
5913 | switch (trans->msg_type) { |
5914 | case NFT_MSG_NEWTABLE: | |
5915 | nf_tables_table_destroy(&trans->ctx); | |
5916 | break; | |
5917 | case NFT_MSG_NEWCHAIN: | |
5918 | nf_tables_chain_destroy(trans->ctx.chain); | |
5919 | break; | |
5920 | case NFT_MSG_NEWRULE: | |
5921 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
5922 | break; | |
5923 | case NFT_MSG_NEWSET: | |
5924 | nft_set_destroy(nft_trans_set(trans)); | |
5925 | break; | |
61edafbb PM |
5926 | case NFT_MSG_NEWSETELEM: |
5927 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 5928 | nft_trans_elem(trans).priv, true); |
61edafbb | 5929 | break; |
e5009240 PNA |
5930 | case NFT_MSG_NEWOBJ: |
5931 | nft_obj_destroy(nft_trans_obj(trans)); | |
5932 | break; | |
3b49e2e9 PNA |
5933 | case NFT_MSG_NEWFLOWTABLE: |
5934 | nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); | |
5935 | break; | |
c7c32e72 PNA |
5936 | } |
5937 | kfree(trans); | |
5938 | } | |
5939 | ||
5913beaf | 5940 | static int nf_tables_abort(struct net *net, struct sk_buff *skb) |
37082f93 | 5941 | { |
37082f93 | 5942 | struct nft_trans *trans, *next; |
02263db0 | 5943 | struct nft_trans_elem *te; |
37082f93 | 5944 | |
a907e36d XL |
5945 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
5946 | list) { | |
b380e5c7 | 5947 | switch (trans->msg_type) { |
55dd6f93 PNA |
5948 | case NFT_MSG_NEWTABLE: |
5949 | if (nft_trans_table_update(trans)) { | |
5950 | if (nft_trans_table_enable(trans)) { | |
664b0f8c | 5951 | nf_tables_table_disable(net, |
55dd6f93 PNA |
5952 | trans->ctx.table); |
5953 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
5954 | } | |
5955 | nft_trans_destroy(trans); | |
5956 | } else { | |
e688a7f8 | 5957 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
5958 | } |
5959 | break; | |
5960 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 5961 | nft_clear(trans->ctx.net, trans->ctx.table); |
55dd6f93 PNA |
5962 | nft_trans_destroy(trans); |
5963 | break; | |
91c7b38d PNA |
5964 | case NFT_MSG_NEWCHAIN: |
5965 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 5966 | free_percpu(nft_trans_chain_stats(trans)); |
91c7b38d PNA |
5967 | |
5968 | nft_trans_destroy(trans); | |
5969 | } else { | |
4fefee57 | 5970 | trans->ctx.table->use--; |
e688a7f8 | 5971 | list_del_rcu(&trans->ctx.chain->list); |
c974a3a3 PNA |
5972 | nf_tables_unregister_hook(trans->ctx.net, |
5973 | trans->ctx.table, | |
5974 | trans->ctx.chain); | |
91c7b38d PNA |
5975 | } |
5976 | break; | |
5977 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 5978 | trans->ctx.table->use++; |
664b0f8c | 5979 | nft_clear(trans->ctx.net, trans->ctx.chain); |
91c7b38d PNA |
5980 | nft_trans_destroy(trans); |
5981 | break; | |
b380e5c7 | 5982 | case NFT_MSG_NEWRULE: |
4fefee57 | 5983 | trans->ctx.chain->use--; |
b380e5c7 PNA |
5984 | list_del_rcu(&nft_trans_rule(trans)->list); |
5985 | break; | |
5986 | case NFT_MSG_DELRULE: | |
4fefee57 | 5987 | trans->ctx.chain->use++; |
889f7ee7 | 5988 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
37082f93 | 5989 | nft_trans_destroy(trans); |
b380e5c7 | 5990 | break; |
958bee14 | 5991 | case NFT_MSG_NEWSET: |
4fefee57 | 5992 | trans->ctx.table->use--; |
e688a7f8 | 5993 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
5994 | break; |
5995 | case NFT_MSG_DELSET: | |
4fefee57 | 5996 | trans->ctx.table->use++; |
37a9cc52 | 5997 | nft_clear(trans->ctx.net, nft_trans_set(trans)); |
958bee14 PNA |
5998 | nft_trans_destroy(trans); |
5999 | break; | |
60319eb1 | 6000 | case NFT_MSG_NEWSETELEM: |
02263db0 | 6001 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 6002 | |
5cb82a38 | 6003 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a | 6004 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
6005 | break; |
6006 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
6007 | te = (struct nft_trans_elem *)trans->data; |
6008 | ||
59105446 | 6009 | nft_set_elem_activate(net, te->set, &te->elem); |
42a55769 | 6010 | te->set->ops->activate(net, te->set, &te->elem); |
3dd0673a | 6011 | te->set->ndeact--; |
cc02e457 | 6012 | |
e5009240 PNA |
6013 | nft_trans_destroy(trans); |
6014 | break; | |
6015 | case NFT_MSG_NEWOBJ: | |
6016 | trans->ctx.table->use--; | |
6017 | list_del_rcu(&nft_trans_obj(trans)->list); | |
6018 | break; | |
6019 | case NFT_MSG_DELOBJ: | |
6020 | trans->ctx.table->use++; | |
6021 | nft_clear(trans->ctx.net, nft_trans_obj(trans)); | |
60319eb1 PNA |
6022 | nft_trans_destroy(trans); |
6023 | break; | |
3b49e2e9 PNA |
6024 | case NFT_MSG_NEWFLOWTABLE: |
6025 | trans->ctx.table->use--; | |
6026 | list_del_rcu(&nft_trans_flowtable(trans)->list); | |
6027 | nft_unregister_flowtable_net_hooks(net, | |
6028 | nft_trans_flowtable(trans)); | |
6029 | break; | |
6030 | case NFT_MSG_DELFLOWTABLE: | |
6031 | trans->ctx.table->use++; | |
6032 | nft_clear(trans->ctx.net, nft_trans_flowtable(trans)); | |
6033 | nft_trans_destroy(trans); | |
6034 | break; | |
37082f93 | 6035 | } |
37082f93 PNA |
6036 | } |
6037 | ||
b326dd37 PNA |
6038 | synchronize_rcu(); |
6039 | ||
a1cee076 PNA |
6040 | list_for_each_entry_safe_reverse(trans, next, |
6041 | &net->nft.commit_list, list) { | |
c7c32e72 | 6042 | list_del(&trans->list); |
b326dd37 | 6043 | nf_tables_abort_release(trans); |
37082f93 PNA |
6044 | } |
6045 | ||
6046 | return 0; | |
6047 | } | |
6048 | ||
74e8bcd2 PNA |
6049 | static bool nf_tables_valid_genid(struct net *net, u32 genid) |
6050 | { | |
6051 | return net->nft.base_seq == genid; | |
6052 | } | |
6053 | ||
96518518 PM |
6054 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
6055 | .name = "nf_tables", | |
6056 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
6057 | .cb_count = NFT_MSG_MAX, | |
6058 | .cb = nf_tables_cb, | |
0628b123 PNA |
6059 | .commit = nf_tables_commit, |
6060 | .abort = nf_tables_abort, | |
74e8bcd2 | 6061 | .valid_genid = nf_tables_valid_genid, |
96518518 PM |
6062 | }; |
6063 | ||
7210e4e3 PNA |
6064 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
6065 | enum nft_chain_type type) | |
6066 | { | |
6067 | const struct nft_base_chain *basechain; | |
6068 | ||
f323d954 | 6069 | if (nft_is_base_chain(chain)) { |
7210e4e3 PNA |
6070 | basechain = nft_base_chain(chain); |
6071 | if (basechain->type->type != type) | |
6072 | return -EOPNOTSUPP; | |
6073 | } | |
6074 | return 0; | |
6075 | } | |
6076 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
6077 | ||
75e8d06d PNA |
6078 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
6079 | unsigned int hook_flags) | |
6080 | { | |
6081 | struct nft_base_chain *basechain; | |
6082 | ||
f323d954 | 6083 | if (nft_is_base_chain(chain)) { |
75e8d06d PNA |
6084 | basechain = nft_base_chain(chain); |
6085 | ||
c974a3a3 | 6086 | if ((1 << basechain->ops.hooknum) & hook_flags) |
75e8d06d PNA |
6087 | return 0; |
6088 | ||
6089 | return -EOPNOTSUPP; | |
6090 | } | |
6091 | ||
6092 | return 0; | |
6093 | } | |
6094 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
6095 | ||
20a69341 PM |
6096 | /* |
6097 | * Loop detection - walk through the ruleset beginning at the destination chain | |
6098 | * of a new jump until either the source chain is reached (loop) or all | |
6099 | * reachable chains have been traversed. | |
6100 | * | |
6101 | * The loop check is performed whenever a new jump verdict is added to an | |
6102 | * expression or verdict map or a verdict map is bound to a new chain. | |
6103 | */ | |
6104 | ||
6105 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
6106 | const struct nft_chain *chain); | |
6107 | ||
6108 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 6109 | struct nft_set *set, |
20a69341 | 6110 | const struct nft_set_iter *iter, |
de70185d | 6111 | struct nft_set_elem *elem) |
20a69341 | 6112 | { |
fe2811eb PM |
6113 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
6114 | const struct nft_data *data; | |
6115 | ||
6116 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
6117 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
6118 | return 0; |
6119 | ||
fe2811eb | 6120 | data = nft_set_ext_data(ext); |
1ca2e170 | 6121 | switch (data->verdict.code) { |
20a69341 PM |
6122 | case NFT_JUMP: |
6123 | case NFT_GOTO: | |
1ca2e170 | 6124 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
6125 | default: |
6126 | return 0; | |
6127 | } | |
6128 | } | |
6129 | ||
6130 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
6131 | const struct nft_chain *chain) | |
6132 | { | |
6133 | const struct nft_rule *rule; | |
6134 | const struct nft_expr *expr, *last; | |
de70185d | 6135 | struct nft_set *set; |
20a69341 PM |
6136 | struct nft_set_binding *binding; |
6137 | struct nft_set_iter iter; | |
20a69341 PM |
6138 | |
6139 | if (ctx->chain == chain) | |
6140 | return -ELOOP; | |
6141 | ||
6142 | list_for_each_entry(rule, &chain->rules, list) { | |
6143 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
6144 | const struct nft_data *data = NULL; |
6145 | int err; | |
6146 | ||
6147 | if (!expr->ops->validate) | |
20a69341 PM |
6148 | continue; |
6149 | ||
0ca743a5 PNA |
6150 | err = expr->ops->validate(ctx, expr, &data); |
6151 | if (err < 0) | |
6152 | return err; | |
6153 | ||
20a69341 | 6154 | if (data == NULL) |
0ca743a5 | 6155 | continue; |
20a69341 | 6156 | |
1ca2e170 | 6157 | switch (data->verdict.code) { |
20a69341 PM |
6158 | case NFT_JUMP: |
6159 | case NFT_GOTO: | |
1ca2e170 PM |
6160 | err = nf_tables_check_loops(ctx, |
6161 | data->verdict.chain); | |
20a69341 PM |
6162 | if (err < 0) |
6163 | return err; | |
6164 | default: | |
6165 | break; | |
6166 | } | |
6167 | } | |
6168 | } | |
6169 | ||
6170 | list_for_each_entry(set, &ctx->table->sets, list) { | |
37a9cc52 PNA |
6171 | if (!nft_is_active_next(ctx->net, set)) |
6172 | continue; | |
20a69341 PM |
6173 | if (!(set->flags & NFT_SET_MAP) || |
6174 | set->dtype != NFT_DATA_VERDICT) | |
6175 | continue; | |
6176 | ||
6177 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
6178 | if (!(binding->flags & NFT_SET_MAP) || |
6179 | binding->chain != chain) | |
20a69341 PM |
6180 | continue; |
6181 | ||
8588ac09 | 6182 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
6183 | iter.skip = 0; |
6184 | iter.count = 0; | |
6185 | iter.err = 0; | |
6186 | iter.fn = nf_tables_loop_check_setelem; | |
6187 | ||
6188 | set->ops->walk(ctx, set, &iter); | |
6189 | if (iter.err < 0) | |
6190 | return iter.err; | |
6191 | } | |
6192 | } | |
6193 | ||
6194 | return 0; | |
6195 | } | |
6196 | ||
36b701fa LGL |
6197 | /** |
6198 | * nft_parse_u32_check - fetch u32 attribute and check for maximum value | |
6199 | * | |
6200 | * @attr: netlink attribute to fetch value from | |
6201 | * @max: maximum value to be stored in dest | |
6202 | * @dest: pointer to the variable | |
6203 | * | |
6204 | * Parse, check and store a given u32 netlink attribute into variable. | |
6205 | * This function returns -ERANGE if the value goes over maximum value. | |
6206 | * Otherwise a 0 is returned and the attribute value is stored in the | |
6207 | * destination variable. | |
6208 | */ | |
f1d505bb | 6209 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) |
36b701fa | 6210 | { |
09525a09 | 6211 | u32 val; |
36b701fa LGL |
6212 | |
6213 | val = ntohl(nla_get_be32(attr)); | |
6214 | if (val > max) | |
6215 | return -ERANGE; | |
6216 | ||
6217 | *dest = val; | |
6218 | return 0; | |
6219 | } | |
6220 | EXPORT_SYMBOL_GPL(nft_parse_u32_check); | |
6221 | ||
49499c3e PM |
6222 | /** |
6223 | * nft_parse_register - parse a register value from a netlink attribute | |
6224 | * | |
6225 | * @attr: netlink attribute | |
6226 | * | |
6227 | * Parse and translate a register value from a netlink attribute. | |
6228 | * Registers used to be 128 bit wide, these register numbers will be | |
6229 | * mapped to the corresponding 32 bit register numbers. | |
6230 | */ | |
b1c96ed3 PM |
6231 | unsigned int nft_parse_register(const struct nlattr *attr) |
6232 | { | |
49499c3e PM |
6233 | unsigned int reg; |
6234 | ||
6235 | reg = ntohl(nla_get_be32(attr)); | |
6236 | switch (reg) { | |
6237 | case NFT_REG_VERDICT...NFT_REG_4: | |
6238 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
6239 | default: | |
6240 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
6241 | } | |
b1c96ed3 PM |
6242 | } |
6243 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
6244 | ||
49499c3e PM |
6245 | /** |
6246 | * nft_dump_register - dump a register value to a netlink attribute | |
6247 | * | |
6248 | * @skb: socket buffer | |
6249 | * @attr: attribute number | |
6250 | * @reg: register number | |
6251 | * | |
6252 | * Construct a netlink attribute containing the register number. For | |
6253 | * compatibility reasons, register numbers being a multiple of 4 are | |
6254 | * translated to the corresponding 128 bit register numbers. | |
6255 | */ | |
b1c96ed3 PM |
6256 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
6257 | { | |
49499c3e PM |
6258 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
6259 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
6260 | else | |
6261 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
6262 | ||
b1c96ed3 PM |
6263 | return nla_put_be32(skb, attr, htonl(reg)); |
6264 | } | |
6265 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
6266 | ||
96518518 | 6267 | /** |
d07db988 | 6268 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
6269 | * |
6270 | * @reg: the register number | |
d07db988 | 6271 | * @len: the length of the data |
96518518 PM |
6272 | * |
6273 | * Validate that the input register is one of the general purpose | |
d07db988 | 6274 | * registers and that the length of the load is within the bounds. |
96518518 | 6275 | */ |
d07db988 | 6276 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 6277 | { |
49499c3e | 6278 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 6279 | return -EINVAL; |
d07db988 PM |
6280 | if (len == 0) |
6281 | return -EINVAL; | |
49499c3e | 6282 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 6283 | return -ERANGE; |
49499c3e | 6284 | |
96518518 PM |
6285 | return 0; |
6286 | } | |
d07db988 | 6287 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 6288 | |
96518518 | 6289 | /** |
1ec10212 | 6290 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
6291 | * |
6292 | * @ctx: context of the expression performing the load | |
6293 | * @reg: the destination register number | |
6294 | * @data: the data to load | |
6295 | * @type: the data type | |
45d9bcda | 6296 | * @len: the length of the data |
96518518 PM |
6297 | * |
6298 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
6299 | * the destination register and the length is within the bounds. |
6300 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 6301 | * data. |
96518518 | 6302 | */ |
1ec10212 PM |
6303 | int nft_validate_register_store(const struct nft_ctx *ctx, |
6304 | enum nft_registers reg, | |
6305 | const struct nft_data *data, | |
6306 | enum nft_data_types type, unsigned int len) | |
96518518 | 6307 | { |
20a69341 PM |
6308 | int err; |
6309 | ||
96518518 PM |
6310 | switch (reg) { |
6311 | case NFT_REG_VERDICT: | |
58f40ab6 | 6312 | if (type != NFT_DATA_VERDICT) |
96518518 | 6313 | return -EINVAL; |
20a69341 | 6314 | |
58f40ab6 | 6315 | if (data != NULL && |
1ca2e170 PM |
6316 | (data->verdict.code == NFT_GOTO || |
6317 | data->verdict.code == NFT_JUMP)) { | |
6318 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
6319 | if (err < 0) |
6320 | return err; | |
6321 | ||
1ca2e170 PM |
6322 | if (ctx->chain->level + 1 > |
6323 | data->verdict.chain->level) { | |
20a69341 PM |
6324 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
6325 | return -EMLINK; | |
1ca2e170 | 6326 | data->verdict.chain->level = ctx->chain->level + 1; |
20a69341 PM |
6327 | } |
6328 | } | |
6329 | ||
96518518 PM |
6330 | return 0; |
6331 | default: | |
49499c3e | 6332 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 6333 | return -EINVAL; |
45d9bcda PM |
6334 | if (len == 0) |
6335 | return -EINVAL; | |
49499c3e PM |
6336 | if (reg * NFT_REG32_SIZE + len > |
6337 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 6338 | return -ERANGE; |
27e6d201 | 6339 | |
96518518 PM |
6340 | if (data != NULL && type != NFT_DATA_VALUE) |
6341 | return -EINVAL; | |
6342 | return 0; | |
6343 | } | |
6344 | } | |
1ec10212 | 6345 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
6346 | |
6347 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
6348 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
6349 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
6350 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
6351 | }; | |
6352 | ||
6353 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
6354 | struct nft_data_desc *desc, const struct nlattr *nla) | |
6355 | { | |
664b0f8c | 6356 | u8 genmask = nft_genmask_next(ctx->net); |
96518518 PM |
6357 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
6358 | struct nft_chain *chain; | |
6359 | int err; | |
6360 | ||
fceb6435 JB |
6361 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy, |
6362 | NULL); | |
96518518 PM |
6363 | if (err < 0) |
6364 | return err; | |
6365 | ||
6366 | if (!tb[NFTA_VERDICT_CODE]) | |
6367 | return -EINVAL; | |
1ca2e170 | 6368 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 6369 | |
1ca2e170 | 6370 | switch (data->verdict.code) { |
e0abdadc | 6371 | default: |
1ca2e170 | 6372 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
6373 | case NF_ACCEPT: |
6374 | case NF_DROP: | |
6375 | case NF_QUEUE: | |
6376 | break; | |
6377 | default: | |
6378 | return -EINVAL; | |
6379 | } | |
6380 | /* fall through */ | |
96518518 PM |
6381 | case NFT_CONTINUE: |
6382 | case NFT_BREAK: | |
6383 | case NFT_RETURN: | |
96518518 PM |
6384 | break; |
6385 | case NFT_JUMP: | |
6386 | case NFT_GOTO: | |
6387 | if (!tb[NFTA_VERDICT_CHAIN]) | |
6388 | return -EINVAL; | |
6389 | chain = nf_tables_chain_lookup(ctx->table, | |
664b0f8c | 6390 | tb[NFTA_VERDICT_CHAIN], genmask); |
96518518 PM |
6391 | if (IS_ERR(chain)) |
6392 | return PTR_ERR(chain); | |
f323d954 | 6393 | if (nft_is_base_chain(chain)) |
96518518 PM |
6394 | return -EOPNOTSUPP; |
6395 | ||
96518518 | 6396 | chain->use++; |
1ca2e170 | 6397 | data->verdict.chain = chain; |
96518518 | 6398 | break; |
96518518 PM |
6399 | } |
6400 | ||
4c4ed074 | 6401 | desc->len = sizeof(data->verdict); |
96518518 PM |
6402 | desc->type = NFT_DATA_VERDICT; |
6403 | return 0; | |
6404 | } | |
6405 | ||
6406 | static void nft_verdict_uninit(const struct nft_data *data) | |
6407 | { | |
1ca2e170 | 6408 | switch (data->verdict.code) { |
96518518 PM |
6409 | case NFT_JUMP: |
6410 | case NFT_GOTO: | |
1ca2e170 | 6411 | data->verdict.chain->use--; |
96518518 PM |
6412 | break; |
6413 | } | |
6414 | } | |
6415 | ||
33d5a7b1 | 6416 | int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) |
96518518 PM |
6417 | { |
6418 | struct nlattr *nest; | |
6419 | ||
33d5a7b1 | 6420 | nest = nla_nest_start(skb, type); |
96518518 PM |
6421 | if (!nest) |
6422 | goto nla_put_failure; | |
6423 | ||
33d5a7b1 | 6424 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) |
96518518 PM |
6425 | goto nla_put_failure; |
6426 | ||
33d5a7b1 | 6427 | switch (v->code) { |
96518518 PM |
6428 | case NFT_JUMP: |
6429 | case NFT_GOTO: | |
1ca2e170 | 6430 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
33d5a7b1 | 6431 | v->chain->name)) |
96518518 PM |
6432 | goto nla_put_failure; |
6433 | } | |
6434 | nla_nest_end(skb, nest); | |
6435 | return 0; | |
6436 | ||
6437 | nla_put_failure: | |
6438 | return -1; | |
6439 | } | |
6440 | ||
d0a11fc3 PM |
6441 | static int nft_value_init(const struct nft_ctx *ctx, |
6442 | struct nft_data *data, unsigned int size, | |
96518518 PM |
6443 | struct nft_data_desc *desc, const struct nlattr *nla) |
6444 | { | |
6445 | unsigned int len; | |
6446 | ||
6447 | len = nla_len(nla); | |
6448 | if (len == 0) | |
6449 | return -EINVAL; | |
d0a11fc3 | 6450 | if (len > size) |
96518518 PM |
6451 | return -EOVERFLOW; |
6452 | ||
d0a11fc3 | 6453 | nla_memcpy(data->data, nla, len); |
96518518 PM |
6454 | desc->type = NFT_DATA_VALUE; |
6455 | desc->len = len; | |
6456 | return 0; | |
6457 | } | |
6458 | ||
6459 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
6460 | unsigned int len) | |
6461 | { | |
6462 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
6463 | } | |
6464 | ||
6465 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 6466 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
6467 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
6468 | }; | |
6469 | ||
6470 | /** | |
6471 | * nft_data_init - parse nf_tables data netlink attributes | |
6472 | * | |
6473 | * @ctx: context of the expression using the data | |
6474 | * @data: destination struct nft_data | |
d0a11fc3 | 6475 | * @size: maximum data length |
96518518 PM |
6476 | * @desc: data description |
6477 | * @nla: netlink attribute containing data | |
6478 | * | |
6479 | * Parse the netlink data attributes and initialize a struct nft_data. | |
6480 | * The type and length of data are returned in the data description. | |
6481 | * | |
6482 | * The caller can indicate that it only wants to accept data of type | |
6483 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
6484 | */ | |
d0a11fc3 PM |
6485 | int nft_data_init(const struct nft_ctx *ctx, |
6486 | struct nft_data *data, unsigned int size, | |
96518518 PM |
6487 | struct nft_data_desc *desc, const struct nlattr *nla) |
6488 | { | |
6489 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
6490 | int err; | |
6491 | ||
fceb6435 | 6492 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL); |
96518518 PM |
6493 | if (err < 0) |
6494 | return err; | |
6495 | ||
6496 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
6497 | return nft_value_init(ctx, data, size, desc, |
6498 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
6499 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
6500 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
6501 | return -EINVAL; | |
6502 | } | |
6503 | EXPORT_SYMBOL_GPL(nft_data_init); | |
6504 | ||
6505 | /** | |
59105446 | 6506 | * nft_data_release - release a nft_data item |
96518518 PM |
6507 | * |
6508 | * @data: struct nft_data to release | |
6509 | * @type: type of data | |
6510 | * | |
6511 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
6512 | * all others need to be released by calling this function. | |
6513 | */ | |
59105446 | 6514 | void nft_data_release(const struct nft_data *data, enum nft_data_types type) |
96518518 | 6515 | { |
960bd2c2 | 6516 | if (type < NFT_DATA_VERDICT) |
96518518 | 6517 | return; |
960bd2c2 | 6518 | switch (type) { |
96518518 PM |
6519 | case NFT_DATA_VERDICT: |
6520 | return nft_verdict_uninit(data); | |
6521 | default: | |
6522 | WARN_ON(1); | |
6523 | } | |
6524 | } | |
59105446 | 6525 | EXPORT_SYMBOL_GPL(nft_data_release); |
96518518 PM |
6526 | |
6527 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
6528 | enum nft_data_types type, unsigned int len) | |
6529 | { | |
6530 | struct nlattr *nest; | |
6531 | int err; | |
6532 | ||
6533 | nest = nla_nest_start(skb, attr); | |
6534 | if (nest == NULL) | |
6535 | return -1; | |
6536 | ||
6537 | switch (type) { | |
6538 | case NFT_DATA_VALUE: | |
6539 | err = nft_value_dump(skb, data, len); | |
6540 | break; | |
6541 | case NFT_DATA_VERDICT: | |
33d5a7b1 | 6542 | err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); |
96518518 PM |
6543 | break; |
6544 | default: | |
6545 | err = -EINVAL; | |
6546 | WARN_ON(1); | |
6547 | } | |
6548 | ||
6549 | nla_nest_end(skb, nest); | |
6550 | return err; | |
6551 | } | |
6552 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
6553 | ||
df05ef87 | 6554 | static int __net_init nf_tables_init_net(struct net *net) |
99633ab2 PNA |
6555 | { |
6556 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 6557 | INIT_LIST_HEAD(&net->nft.commit_list); |
38e029f1 | 6558 | net->nft.base_seq = 1; |
99633ab2 PNA |
6559 | return 0; |
6560 | } | |
6561 | ||
613d0776 VA |
6562 | static void __net_exit nf_tables_exit_net(struct net *net) |
6563 | { | |
6564 | WARN_ON_ONCE(!list_empty(&net->nft.af_info)); | |
6565 | WARN_ON_ONCE(!list_empty(&net->nft.commit_list)); | |
6566 | } | |
6567 | ||
5ebe0b0e PNA |
6568 | int __nft_release_basechain(struct nft_ctx *ctx) |
6569 | { | |
6570 | struct nft_rule *rule, *nr; | |
6571 | ||
f323d954 | 6572 | BUG_ON(!nft_is_base_chain(ctx->chain)); |
5ebe0b0e | 6573 | |
c974a3a3 | 6574 | nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain); |
5ebe0b0e PNA |
6575 | list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { |
6576 | list_del(&rule->list); | |
6577 | ctx->chain->use--; | |
6578 | nf_tables_rule_destroy(ctx, rule); | |
6579 | } | |
6580 | list_del(&ctx->chain->list); | |
6581 | ctx->table->use--; | |
6582 | nf_tables_chain_destroy(ctx->chain); | |
6583 | ||
6584 | return 0; | |
6585 | } | |
6586 | EXPORT_SYMBOL_GPL(__nft_release_basechain); | |
6587 | ||
df05ef87 PNA |
6588 | /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */ |
6589 | static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi) | |
6590 | { | |
3b49e2e9 | 6591 | struct nft_flowtable *flowtable, *nf; |
df05ef87 PNA |
6592 | struct nft_table *table, *nt; |
6593 | struct nft_chain *chain, *nc; | |
e5009240 | 6594 | struct nft_object *obj, *ne; |
df05ef87 PNA |
6595 | struct nft_rule *rule, *nr; |
6596 | struct nft_set *set, *ns; | |
6597 | struct nft_ctx ctx = { | |
6598 | .net = net, | |
6599 | .afi = afi, | |
6600 | }; | |
6601 | ||
6602 | list_for_each_entry_safe(table, nt, &afi->tables, list) { | |
6603 | list_for_each_entry(chain, &table->chains, list) | |
c974a3a3 | 6604 | nf_tables_unregister_hook(net, table, chain); |
3b49e2e9 PNA |
6605 | list_for_each_entry(flowtable, &table->flowtables, list) |
6606 | nf_unregister_net_hooks(net, flowtable->ops, | |
6607 | flowtable->ops_len); | |
df05ef87 PNA |
6608 | /* No packets are walking on these chains anymore. */ |
6609 | ctx.table = table; | |
6610 | list_for_each_entry(chain, &table->chains, list) { | |
6611 | ctx.chain = chain; | |
6612 | list_for_each_entry_safe(rule, nr, &chain->rules, list) { | |
6613 | list_del(&rule->list); | |
6614 | chain->use--; | |
6615 | nf_tables_rule_destroy(&ctx, rule); | |
6616 | } | |
6617 | } | |
3b49e2e9 PNA |
6618 | list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) { |
6619 | list_del(&flowtable->list); | |
6620 | table->use--; | |
6621 | nf_tables_flowtable_destroy(flowtable); | |
6622 | } | |
df05ef87 PNA |
6623 | list_for_each_entry_safe(set, ns, &table->sets, list) { |
6624 | list_del(&set->list); | |
6625 | table->use--; | |
6626 | nft_set_destroy(set); | |
6627 | } | |
e5009240 PNA |
6628 | list_for_each_entry_safe(obj, ne, &table->objects, list) { |
6629 | list_del(&obj->list); | |
6630 | table->use--; | |
6631 | nft_obj_destroy(obj); | |
6632 | } | |
df05ef87 PNA |
6633 | list_for_each_entry_safe(chain, nc, &table->chains, list) { |
6634 | list_del(&chain->list); | |
6635 | table->use--; | |
6636 | nf_tables_chain_destroy(chain); | |
6637 | } | |
6638 | list_del(&table->list); | |
6639 | nf_tables_table_destroy(&ctx); | |
6640 | } | |
6641 | } | |
6642 | ||
99633ab2 PNA |
6643 | static struct pernet_operations nf_tables_net_ops = { |
6644 | .init = nf_tables_init_net, | |
613d0776 | 6645 | .exit = nf_tables_exit_net, |
99633ab2 PNA |
6646 | }; |
6647 | ||
96518518 PM |
6648 | static int __init nf_tables_module_init(void) |
6649 | { | |
6650 | int err; | |
6651 | ||
6652 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
6653 | GFP_KERNEL); | |
6654 | if (info == NULL) { | |
6655 | err = -ENOMEM; | |
6656 | goto err1; | |
6657 | } | |
6658 | ||
6659 | err = nf_tables_core_module_init(); | |
6660 | if (err < 0) | |
6661 | goto err2; | |
6662 | ||
6663 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
6664 | if (err < 0) | |
6665 | goto err3; | |
6666 | ||
3b49e2e9 PNA |
6667 | register_netdevice_notifier(&nf_tables_flowtable_notifier); |
6668 | ||
96518518 | 6669 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); |
99633ab2 | 6670 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
6671 | err3: |
6672 | nf_tables_core_module_exit(); | |
6673 | err2: | |
6674 | kfree(info); | |
6675 | err1: | |
6676 | return err; | |
6677 | } | |
6678 | ||
6679 | static void __exit nf_tables_module_exit(void) | |
6680 | { | |
99633ab2 | 6681 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 | 6682 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
3b49e2e9 | 6683 | unregister_netdevice_notifier(&nf_tables_flowtable_notifier); |
1b1bc49c | 6684 | rcu_barrier(); |
96518518 PM |
6685 | nf_tables_core_module_exit(); |
6686 | kfree(info); | |
6687 | } | |
6688 | ||
6689 | module_init(nf_tables_module_init); | |
6690 | module_exit(nf_tables_module_exit); | |
6691 | ||
6692 | MODULE_LICENSE("GPL"); | |
6693 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
6694 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |