Commit | Line | Data |
---|---|---|
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); |
3ecbfd65 | 29 | static u64 table_handle; |
96518518 | 30 | |
a654de8f PNA |
31 | enum { |
32 | NFT_VALIDATE_SKIP = 0, | |
33 | NFT_VALIDATE_NEED, | |
34 | NFT_VALIDATE_DO, | |
35 | }; | |
36 | ||
1b2470e5 FW |
37 | static u32 nft_chain_hash(const void *data, u32 len, u32 seed); |
38 | static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed); | |
39 | static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *); | |
40 | ||
41 | static const struct rhashtable_params nft_chain_ht_params = { | |
42 | .head_offset = offsetof(struct nft_chain, rhlhead), | |
43 | .key_offset = offsetof(struct nft_chain, name), | |
44 | .hashfn = nft_chain_hash, | |
45 | .obj_hashfn = nft_chain_hash_obj, | |
46 | .obj_cmpfn = nft_chain_hash_cmp, | |
47 | .locks_mul = 1, | |
48 | .automatic_shrinking = true, | |
49 | }; | |
50 | ||
a654de8f PNA |
51 | static void nft_validate_state_update(struct net *net, u8 new_validate_state) |
52 | { | |
53 | switch (net->nft.validate_state) { | |
54 | case NFT_VALIDATE_SKIP: | |
55 | WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO); | |
56 | break; | |
57 | case NFT_VALIDATE_NEED: | |
58 | break; | |
59 | case NFT_VALIDATE_DO: | |
60 | if (new_validate_state == NFT_VALIDATE_NEED) | |
61 | return; | |
62 | } | |
63 | ||
64 | net->nft.validate_state = new_validate_state; | |
65 | } | |
66 | ||
7c95f6d8 | 67 | static void nft_ctx_init(struct nft_ctx *ctx, |
633c9a84 | 68 | struct net *net, |
7c95f6d8 PNA |
69 | const struct sk_buff *skb, |
70 | const struct nlmsghdr *nlh, | |
36596dad | 71 | u8 family, |
7c95f6d8 PNA |
72 | struct nft_table *table, |
73 | struct nft_chain *chain, | |
74 | const struct nlattr * const *nla) | |
75 | { | |
633c9a84 | 76 | ctx->net = net; |
36596dad | 77 | ctx->family = family; |
128ad332 PNA |
78 | ctx->table = table; |
79 | ctx->chain = chain; | |
80 | ctx->nla = nla; | |
81 | ctx->portid = NETLINK_CB(skb).portid; | |
82 | ctx->report = nlmsg_report(nlh); | |
83 | ctx->seq = nlh->nlmsg_seq; | |
7c95f6d8 PNA |
84 | } |
85 | ||
8411b644 PNA |
86 | static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx, |
87 | int msg_type, u32 size, gfp_t gfp) | |
1081d11b PNA |
88 | { |
89 | struct nft_trans *trans; | |
90 | ||
8411b644 | 91 | trans = kzalloc(sizeof(struct nft_trans) + size, gfp); |
1081d11b PNA |
92 | if (trans == NULL) |
93 | return NULL; | |
94 | ||
b380e5c7 | 95 | trans->msg_type = msg_type; |
1081d11b PNA |
96 | trans->ctx = *ctx; |
97 | ||
98 | return trans; | |
99 | } | |
100 | ||
8411b644 PNA |
101 | static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx, |
102 | int msg_type, u32 size) | |
103 | { | |
104 | return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL); | |
105 | } | |
106 | ||
1081d11b PNA |
107 | static void nft_trans_destroy(struct nft_trans *trans) |
108 | { | |
109 | list_del(&trans->list); | |
110 | kfree(trans); | |
111 | } | |
112 | ||
c974a3a3 PNA |
113 | static int nf_tables_register_hook(struct net *net, |
114 | const struct nft_table *table, | |
115 | struct nft_chain *chain) | |
d8ee8f7c | 116 | { |
4e25ceb8 | 117 | const struct nft_base_chain *basechain; |
a37061a6 | 118 | const struct nf_hook_ops *ops; |
ae6153b5 | 119 | |
d8ee8f7c | 120 | if (table->flags & NFT_TABLE_F_DORMANT || |
f323d954 | 121 | !nft_is_base_chain(chain)) |
d8ee8f7c PNA |
122 | return 0; |
123 | ||
4e25ceb8 FW |
124 | basechain = nft_base_chain(chain); |
125 | ops = &basechain->ops; | |
ae6153b5 | 126 | |
4e25ceb8 FW |
127 | if (basechain->type->ops_register) |
128 | return basechain->type->ops_register(net, ops); | |
129 | ||
a37061a6 | 130 | return nf_register_net_hook(net, ops); |
d8ee8f7c PNA |
131 | } |
132 | ||
c974a3a3 PNA |
133 | static void nf_tables_unregister_hook(struct net *net, |
134 | const struct nft_table *table, | |
135 | struct nft_chain *chain) | |
c5598794 | 136 | { |
4e25ceb8 FW |
137 | const struct nft_base_chain *basechain; |
138 | const struct nf_hook_ops *ops; | |
139 | ||
d8ee8f7c | 140 | if (table->flags & NFT_TABLE_F_DORMANT || |
f323d954 | 141 | !nft_is_base_chain(chain)) |
d8ee8f7c | 142 | return; |
4e25ceb8 FW |
143 | basechain = nft_base_chain(chain); |
144 | ops = &basechain->ops; | |
d8ee8f7c | 145 | |
4e25ceb8 FW |
146 | if (basechain->type->ops_unregister) |
147 | return basechain->type->ops_unregister(net, ops); | |
148 | ||
149 | nf_unregister_net_hook(net, ops); | |
c5598794 AB |
150 | } |
151 | ||
ee01d542 AB |
152 | static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) |
153 | { | |
154 | struct nft_trans *trans; | |
155 | ||
156 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); | |
157 | if (trans == NULL) | |
158 | return -ENOMEM; | |
159 | ||
160 | if (msg_type == NFT_MSG_NEWTABLE) | |
f2a6d766 | 161 | nft_activate_next(ctx->net, ctx->table); |
ee01d542 AB |
162 | |
163 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
164 | return 0; | |
165 | } | |
166 | ||
167 | static int nft_deltable(struct nft_ctx *ctx) | |
168 | { | |
169 | int err; | |
170 | ||
171 | err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); | |
172 | if (err < 0) | |
173 | return err; | |
174 | ||
f2a6d766 | 175 | nft_deactivate_next(ctx->net, ctx->table); |
ee01d542 AB |
176 | return err; |
177 | } | |
178 | ||
179 | static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) | |
180 | { | |
181 | struct nft_trans *trans; | |
182 | ||
183 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); | |
184 | if (trans == NULL) | |
185 | return -ENOMEM; | |
186 | ||
187 | if (msg_type == NFT_MSG_NEWCHAIN) | |
664b0f8c | 188 | nft_activate_next(ctx->net, ctx->chain); |
ee01d542 AB |
189 | |
190 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static int nft_delchain(struct nft_ctx *ctx) | |
195 | { | |
196 | int err; | |
197 | ||
198 | err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); | |
199 | if (err < 0) | |
200 | return err; | |
201 | ||
202 | ctx->table->use--; | |
664b0f8c | 203 | nft_deactivate_next(ctx->net, ctx->chain); |
ee01d542 AB |
204 | |
205 | return err; | |
206 | } | |
207 | ||
bb7b40ae PNA |
208 | static void nft_rule_expr_activate(const struct nft_ctx *ctx, |
209 | struct nft_rule *rule) | |
210 | { | |
211 | struct nft_expr *expr; | |
212 | ||
213 | expr = nft_expr_first(rule); | |
214 | while (expr != nft_expr_last(rule) && expr->ops) { | |
215 | if (expr->ops->activate) | |
216 | expr->ops->activate(ctx, expr); | |
217 | ||
218 | expr = nft_expr_next(expr); | |
219 | } | |
220 | } | |
221 | ||
222 | static void nft_rule_expr_deactivate(const struct nft_ctx *ctx, | |
223 | struct nft_rule *rule) | |
224 | { | |
225 | struct nft_expr *expr; | |
226 | ||
227 | expr = nft_expr_first(rule); | |
228 | while (expr != nft_expr_last(rule) && expr->ops) { | |
229 | if (expr->ops->deactivate) | |
230 | expr->ops->deactivate(ctx, expr); | |
231 | ||
232 | expr = nft_expr_next(expr); | |
233 | } | |
234 | } | |
235 | ||
ee01d542 AB |
236 | static int |
237 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) | |
238 | { | |
239 | /* You cannot delete the same rule twice */ | |
889f7ee7 PNA |
240 | if (nft_is_active_next(ctx->net, rule)) { |
241 | nft_deactivate_next(ctx->net, rule); | |
ee01d542 AB |
242 | ctx->chain->use--; |
243 | return 0; | |
244 | } | |
245 | return -ENOENT; | |
246 | } | |
247 | ||
248 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, | |
249 | struct nft_rule *rule) | |
250 | { | |
251 | struct nft_trans *trans; | |
252 | ||
253 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); | |
254 | if (trans == NULL) | |
255 | return NULL; | |
256 | ||
1a94e38d PNA |
257 | if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) { |
258 | nft_trans_rule_id(trans) = | |
259 | ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID])); | |
260 | } | |
ee01d542 AB |
261 | nft_trans_rule(trans) = rule; |
262 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
263 | ||
264 | return trans; | |
265 | } | |
266 | ||
267 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) | |
268 | { | |
269 | struct nft_trans *trans; | |
270 | int err; | |
271 | ||
272 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); | |
273 | if (trans == NULL) | |
274 | return -ENOMEM; | |
275 | ||
276 | err = nf_tables_delrule_deactivate(ctx, rule); | |
277 | if (err < 0) { | |
278 | nft_trans_destroy(trans); | |
279 | return err; | |
280 | } | |
bb7b40ae | 281 | nft_rule_expr_deactivate(ctx, rule); |
ee01d542 AB |
282 | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static int nft_delrule_by_chain(struct nft_ctx *ctx) | |
287 | { | |
288 | struct nft_rule *rule; | |
289 | int err; | |
290 | ||
291 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
292 | err = nft_delrule(ctx, rule); | |
293 | if (err < 0) | |
294 | return err; | |
295 | } | |
296 | return 0; | |
297 | } | |
298 | ||
ee01d542 AB |
299 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, |
300 | struct nft_set *set) | |
301 | { | |
302 | struct nft_trans *trans; | |
303 | ||
304 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); | |
305 | if (trans == NULL) | |
306 | return -ENOMEM; | |
307 | ||
308 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { | |
309 | nft_trans_set_id(trans) = | |
310 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); | |
37a9cc52 | 311 | nft_activate_next(ctx->net, set); |
ee01d542 AB |
312 | } |
313 | nft_trans_set(trans) = set; | |
314 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static int nft_delset(struct nft_ctx *ctx, struct nft_set *set) | |
320 | { | |
321 | int err; | |
322 | ||
323 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); | |
324 | if (err < 0) | |
325 | return err; | |
326 | ||
37a9cc52 | 327 | nft_deactivate_next(ctx->net, set); |
ee01d542 AB |
328 | ctx->table->use--; |
329 | ||
330 | return err; | |
331 | } | |
332 | ||
e5009240 PNA |
333 | static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type, |
334 | struct nft_object *obj) | |
335 | { | |
336 | struct nft_trans *trans; | |
337 | ||
338 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj)); | |
339 | if (trans == NULL) | |
340 | return -ENOMEM; | |
341 | ||
342 | if (msg_type == NFT_MSG_NEWOBJ) | |
343 | nft_activate_next(ctx->net, obj); | |
344 | ||
345 | nft_trans_obj(trans) = obj; | |
346 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj) | |
352 | { | |
353 | int err; | |
354 | ||
355 | err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj); | |
356 | if (err < 0) | |
357 | return err; | |
358 | ||
359 | nft_deactivate_next(ctx->net, obj); | |
360 | ctx->table->use--; | |
361 | ||
362 | return err; | |
363 | } | |
364 | ||
3b49e2e9 PNA |
365 | static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type, |
366 | struct nft_flowtable *flowtable) | |
367 | { | |
368 | struct nft_trans *trans; | |
369 | ||
370 | trans = nft_trans_alloc(ctx, msg_type, | |
371 | sizeof(struct nft_trans_flowtable)); | |
372 | if (trans == NULL) | |
373 | return -ENOMEM; | |
374 | ||
375 | if (msg_type == NFT_MSG_NEWFLOWTABLE) | |
376 | nft_activate_next(ctx->net, flowtable); | |
377 | ||
378 | nft_trans_flowtable(trans) = flowtable; | |
379 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | static int nft_delflowtable(struct nft_ctx *ctx, | |
385 | struct nft_flowtable *flowtable) | |
386 | { | |
387 | int err; | |
388 | ||
389 | err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable); | |
390 | if (err < 0) | |
391 | return err; | |
392 | ||
393 | nft_deactivate_next(ctx->net, flowtable); | |
394 | ctx->table->use--; | |
395 | ||
396 | return err; | |
397 | } | |
398 | ||
96518518 PM |
399 | /* |
400 | * Tables | |
401 | */ | |
402 | ||
36596dad | 403 | static struct nft_table *nft_table_lookup(const struct net *net, |
f2a6d766 | 404 | const struct nlattr *nla, |
36596dad | 405 | u8 family, u8 genmask) |
96518518 PM |
406 | { |
407 | struct nft_table *table; | |
408 | ||
cac20fcd PNA |
409 | if (nla == NULL) |
410 | return ERR_PTR(-EINVAL); | |
411 | ||
d9adf22a | 412 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
f2a6d766 | 413 | if (!nla_strcmp(nla, table->name) && |
98319cb9 | 414 | table->family == family && |
f2a6d766 | 415 | nft_active_genmask(table, genmask)) |
96518518 PM |
416 | return table; |
417 | } | |
cac20fcd PNA |
418 | |
419 | return ERR_PTR(-ENOENT); | |
96518518 PM |
420 | } |
421 | ||
3ecbfd65 HS |
422 | static struct nft_table *nft_table_lookup_byhandle(const struct net *net, |
423 | const struct nlattr *nla, | |
424 | u8 genmask) | |
425 | { | |
426 | struct nft_table *table; | |
427 | ||
428 | list_for_each_entry(table, &net->nft.tables, list) { | |
429 | if (be64_to_cpu(nla_get_be64(nla)) == table->handle && | |
430 | nft_active_genmask(table, genmask)) | |
431 | return table; | |
432 | } | |
3ecbfd65 HS |
433 | |
434 | return ERR_PTR(-ENOENT); | |
435 | } | |
436 | ||
96518518 PM |
437 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) |
438 | { | |
439 | return ++table->hgenerator; | |
440 | } | |
441 | ||
32537e91 | 442 | static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX]; |
9370761c | 443 | |
32537e91 | 444 | static const struct nft_chain_type * |
1ea26cca | 445 | __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family) |
9370761c PNA |
446 | { |
447 | int i; | |
448 | ||
baae3e62 | 449 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
450 | if (chain_type[family][i] != NULL && |
451 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 452 | return chain_type[family][i]; |
9370761c | 453 | } |
baae3e62 | 454 | return NULL; |
9370761c PNA |
455 | } |
456 | ||
32537e91 | 457 | static const struct nft_chain_type * |
1ea26cca | 458 | nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family, bool autoload) |
9370761c | 459 | { |
32537e91 | 460 | const struct nft_chain_type *type; |
9370761c | 461 | |
1ea26cca | 462 | type = __nf_tables_chain_type_lookup(nla, family); |
93b0806f PM |
463 | if (type != NULL) |
464 | return type; | |
9370761c | 465 | #ifdef CONFIG_MODULES |
93b0806f | 466 | if (autoload) { |
9370761c | 467 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1ea26cca | 468 | request_module("nft-chain-%u-%.*s", family, |
2fec6bb6 | 469 | nla_len(nla), (const char *)nla_data(nla)); |
9370761c | 470 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
1ea26cca | 471 | type = __nf_tables_chain_type_lookup(nla, family); |
93b0806f PM |
472 | if (type != NULL) |
473 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
474 | } |
475 | #endif | |
93b0806f | 476 | return ERR_PTR(-ENOENT); |
9370761c PNA |
477 | } |
478 | ||
96518518 | 479 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
1cae565e PNA |
480 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
481 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
9ddf6323 | 482 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
3ecbfd65 | 483 | [NFTA_TABLE_HANDLE] = { .type = NLA_U64 }, |
96518518 PM |
484 | }; |
485 | ||
84d7fce6 PNA |
486 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
487 | u32 portid, u32 seq, int event, u32 flags, | |
488 | int family, const struct nft_table *table) | |
96518518 PM |
489 | { |
490 | struct nlmsghdr *nlh; | |
491 | struct nfgenmsg *nfmsg; | |
492 | ||
dedb67c4 | 493 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
494 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
495 | if (nlh == NULL) | |
496 | goto nla_put_failure; | |
497 | ||
498 | nfmsg = nlmsg_data(nlh); | |
499 | nfmsg->nfgen_family = family; | |
500 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 501 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 | 502 | |
9ddf6323 | 503 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 | 504 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
3ecbfd65 HS |
505 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) || |
506 | nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle), | |
507 | NFTA_TABLE_PAD)) | |
96518518 PM |
508 | goto nla_put_failure; |
509 | ||
053c095a JB |
510 | nlmsg_end(skb, nlh); |
511 | return 0; | |
96518518 PM |
512 | |
513 | nla_put_failure: | |
514 | nlmsg_trim(skb, nlh); | |
515 | return -1; | |
516 | } | |
517 | ||
25e94a99 | 518 | static void nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
519 | { |
520 | struct sk_buff *skb; | |
96518518 PM |
521 | int err; |
522 | ||
128ad332 PNA |
523 | if (!ctx->report && |
524 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 525 | return; |
96518518 | 526 | |
96518518 PM |
527 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
528 | if (skb == NULL) | |
529 | goto err; | |
530 | ||
84d7fce6 | 531 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 532 | event, 0, ctx->family, ctx->table); |
96518518 PM |
533 | if (err < 0) { |
534 | kfree_skb(skb); | |
535 | goto err; | |
536 | } | |
537 | ||
25e94a99 PNA |
538 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
539 | ctx->report, GFP_KERNEL); | |
540 | return; | |
96518518 | 541 | err: |
25e94a99 | 542 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
543 | } |
544 | ||
545 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
546 | struct netlink_callback *cb) | |
547 | { | |
548 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
96518518 PM |
549 | const struct nft_table *table; |
550 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 551 | struct net *net = sock_net(skb->sk); |
96518518 PM |
552 | int family = nfmsg->nfgen_family; |
553 | ||
e688a7f8 | 554 | rcu_read_lock(); |
38e029f1 PNA |
555 | cb->seq = net->nft.base_seq; |
556 | ||
36596dad | 557 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 558 | if (family != NFPROTO_UNSPEC && family != table->family) |
96518518 PM |
559 | continue; |
560 | ||
36596dad PNA |
561 | if (idx < s_idx) |
562 | goto cont; | |
563 | if (idx > s_idx) | |
564 | memset(&cb->args[1], 0, | |
565 | sizeof(cb->args) - sizeof(cb->args[0])); | |
566 | if (!nft_is_active(net, table)) | |
567 | continue; | |
568 | if (nf_tables_fill_table_info(skb, net, | |
569 | NETLINK_CB(cb->skb).portid, | |
570 | cb->nlh->nlmsg_seq, | |
571 | NFT_MSG_NEWTABLE, NLM_F_MULTI, | |
98319cb9 | 572 | table->family, table) < 0) |
36596dad PNA |
573 | goto done; |
574 | ||
575 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 | 576 | cont: |
36596dad | 577 | idx++; |
96518518 PM |
578 | } |
579 | done: | |
e688a7f8 | 580 | rcu_read_unlock(); |
96518518 PM |
581 | cb->args[0] = idx; |
582 | return skb->len; | |
583 | } | |
584 | ||
d9adf22a FW |
585 | static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb, |
586 | const struct nlmsghdr *nlh, | |
587 | struct netlink_dump_control *c) | |
588 | { | |
589 | int err; | |
590 | ||
591 | if (!try_module_get(THIS_MODULE)) | |
592 | return -EINVAL; | |
593 | ||
594 | rcu_read_unlock(); | |
595 | err = netlink_dump_start(nlsk, skb, nlh, c); | |
596 | rcu_read_lock(); | |
597 | module_put(THIS_MODULE); | |
598 | ||
599 | return err; | |
600 | } | |
601 | ||
602 | /* called with rcu_read_lock held */ | |
7b8002a1 PNA |
603 | static int nf_tables_gettable(struct net *net, struct sock *nlsk, |
604 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
605 | const struct nlattr * const nla[], |
606 | struct netlink_ext_ack *extack) | |
96518518 PM |
607 | { |
608 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 609 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
610 | const struct nft_table *table; |
611 | struct sk_buff *skb2; | |
612 | int family = nfmsg->nfgen_family; | |
613 | int err; | |
614 | ||
615 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
616 | struct netlink_dump_control c = { | |
617 | .dump = nf_tables_dump_tables, | |
d9adf22a | 618 | .module = THIS_MODULE, |
96518518 | 619 | }; |
d9adf22a FW |
620 | |
621 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); | |
96518518 PM |
622 | } |
623 | ||
cac20fcd | 624 | table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask); |
36dd1bcc PNA |
625 | if (IS_ERR(table)) { |
626 | NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]); | |
96518518 | 627 | return PTR_ERR(table); |
36dd1bcc | 628 | } |
96518518 | 629 | |
d9adf22a | 630 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
96518518 PM |
631 | if (!skb2) |
632 | return -ENOMEM; | |
633 | ||
84d7fce6 | 634 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
635 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
636 | family, table); | |
637 | if (err < 0) | |
638 | goto err; | |
639 | ||
640 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
641 | ||
642 | err: | |
643 | kfree_skb(skb2); | |
644 | return err; | |
645 | } | |
646 | ||
c9c17211 | 647 | static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt) |
10435c11 F |
648 | { |
649 | struct nft_chain *chain; | |
650 | u32 i = 0; | |
651 | ||
652 | list_for_each_entry(chain, &table->chains, list) { | |
653 | if (!nft_is_active_next(net, chain)) | |
654 | continue; | |
f323d954 | 655 | if (!nft_is_base_chain(chain)) |
10435c11 F |
656 | continue; |
657 | ||
658 | if (cnt && i++ == cnt) | |
659 | break; | |
660 | ||
c974a3a3 | 661 | nf_unregister_net_hook(net, &nft_base_chain(chain)->ops); |
10435c11 F |
662 | } |
663 | } | |
664 | ||
c9c17211 | 665 | static int nf_tables_table_enable(struct net *net, struct nft_table *table) |
9ddf6323 PNA |
666 | { |
667 | struct nft_chain *chain; | |
668 | int err, i = 0; | |
669 | ||
670 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
671 | if (!nft_is_active_next(net, chain)) |
672 | continue; | |
f323d954 | 673 | if (!nft_is_base_chain(chain)) |
d2012975 PNA |
674 | continue; |
675 | ||
c974a3a3 | 676 | err = nf_register_net_hook(net, &nft_base_chain(chain)->ops); |
9ddf6323 PNA |
677 | if (err < 0) |
678 | goto err; | |
679 | ||
680 | i++; | |
681 | } | |
682 | return 0; | |
683 | err: | |
10435c11 | 684 | if (i) |
c9c17211 | 685 | nft_table_disable(net, table, i); |
9ddf6323 PNA |
686 | return err; |
687 | } | |
688 | ||
c9c17211 | 689 | static void nf_tables_table_disable(struct net *net, struct nft_table *table) |
9ddf6323 | 690 | { |
c9c17211 | 691 | nft_table_disable(net, table, 0); |
9ddf6323 PNA |
692 | } |
693 | ||
e1aaca93 | 694 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 695 | { |
55dd6f93 | 696 | struct nft_trans *trans; |
e1aaca93 | 697 | u32 flags; |
55dd6f93 | 698 | int ret = 0; |
9ddf6323 | 699 | |
e1aaca93 PNA |
700 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
701 | return 0; | |
9ddf6323 | 702 | |
e1aaca93 PNA |
703 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
704 | if (flags & ~NFT_TABLE_F_DORMANT) | |
705 | return -EINVAL; | |
706 | ||
63283dd2 PNA |
707 | if (flags == ctx->table->flags) |
708 | return 0; | |
709 | ||
55dd6f93 PNA |
710 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
711 | sizeof(struct nft_trans_table)); | |
712 | if (trans == NULL) | |
713 | return -ENOMEM; | |
9ddf6323 | 714 | |
e1aaca93 PNA |
715 | if ((flags & NFT_TABLE_F_DORMANT) && |
716 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 717 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
718 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
719 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
c9c17211 | 720 | ret = nf_tables_table_enable(ctx->net, ctx->table); |
55dd6f93 | 721 | if (ret >= 0) { |
e1aaca93 | 722 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 723 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 724 | } |
9ddf6323 | 725 | } |
e1aaca93 PNA |
726 | if (ret < 0) |
727 | goto err; | |
9ddf6323 | 728 | |
55dd6f93 PNA |
729 | nft_trans_table_update(trans) = true; |
730 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
731 | return 0; | |
9ddf6323 | 732 | err: |
55dd6f93 | 733 | nft_trans_destroy(trans); |
9ddf6323 PNA |
734 | return ret; |
735 | } | |
736 | ||
1b2470e5 FW |
737 | static u32 nft_chain_hash(const void *data, u32 len, u32 seed) |
738 | { | |
739 | const char *name = data; | |
740 | ||
741 | return jhash(name, strlen(name), seed); | |
742 | } | |
743 | ||
744 | static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed) | |
745 | { | |
746 | const struct nft_chain *chain = data; | |
747 | ||
748 | return nft_chain_hash(chain->name, 0, seed); | |
749 | } | |
750 | ||
751 | static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg, | |
752 | const void *ptr) | |
753 | { | |
754 | const struct nft_chain *chain = ptr; | |
755 | const char *name = arg->key; | |
756 | ||
757 | return strcmp(chain->name, name); | |
758 | } | |
759 | ||
633c9a84 PNA |
760 | static int nf_tables_newtable(struct net *net, struct sock *nlsk, |
761 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
762 | const struct nlattr * const nla[], |
763 | struct netlink_ext_ack *extack) | |
96518518 PM |
764 | { |
765 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 766 | u8 genmask = nft_genmask_next(net); |
96518518 | 767 | int family = nfmsg->nfgen_family; |
36dd1bcc PNA |
768 | const struct nlattr *attr; |
769 | struct nft_table *table; | |
c5c1f975 | 770 | u32 flags = 0; |
e1aaca93 | 771 | struct nft_ctx ctx; |
55dd6f93 | 772 | int err; |
96518518 | 773 | |
36dd1bcc PNA |
774 | attr = nla[NFTA_TABLE_NAME]; |
775 | table = nft_table_lookup(net, attr, family, genmask); | |
96518518 PM |
776 | if (IS_ERR(table)) { |
777 | if (PTR_ERR(table) != -ENOENT) | |
778 | return PTR_ERR(table); | |
1a28ad74 | 779 | } else { |
36dd1bcc PNA |
780 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
781 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 782 | return -EEXIST; |
36dd1bcc | 783 | } |
96518518 PM |
784 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
785 | return -EOPNOTSUPP; | |
e1aaca93 | 786 | |
98319cb9 | 787 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e1aaca93 | 788 | return nf_tables_updtable(&ctx); |
96518518 PM |
789 | } |
790 | ||
c5c1f975 PM |
791 | if (nla[NFTA_TABLE_FLAGS]) { |
792 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
793 | if (flags & ~NFT_TABLE_F_DORMANT) | |
794 | return -EINVAL; | |
795 | } | |
796 | ||
ffdb210e | 797 | err = -ENOMEM; |
1cae565e | 798 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
ffdb210e | 799 | if (table == NULL) |
98319cb9 | 800 | goto err_kzalloc; |
96518518 | 801 | |
36dd1bcc | 802 | table->name = nla_strdup(attr, GFP_KERNEL); |
e46abbcc | 803 | if (table->name == NULL) |
98319cb9 | 804 | goto err_strdup; |
e46abbcc | 805 | |
1b2470e5 FW |
806 | err = rhltable_init(&table->chains_ht, &nft_chain_ht_params); |
807 | if (err) | |
808 | goto err_chain_ht; | |
809 | ||
96518518 | 810 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 811 | INIT_LIST_HEAD(&table->sets); |
e5009240 | 812 | INIT_LIST_HEAD(&table->objects); |
3b49e2e9 | 813 | INIT_LIST_HEAD(&table->flowtables); |
98319cb9 | 814 | table->family = family; |
c5c1f975 | 815 | table->flags = flags; |
3ecbfd65 | 816 | table->handle = ++table_handle; |
9ddf6323 | 817 | |
98319cb9 | 818 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
55dd6f93 | 819 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
ffdb210e | 820 | if (err < 0) |
98319cb9 | 821 | goto err_trans; |
ffdb210e | 822 | |
36596dad | 823 | list_add_tail_rcu(&table->list, &net->nft.tables); |
96518518 | 824 | return 0; |
98319cb9 | 825 | err_trans: |
1b2470e5 FW |
826 | rhltable_destroy(&table->chains_ht); |
827 | err_chain_ht: | |
e46abbcc | 828 | kfree(table->name); |
98319cb9 | 829 | err_strdup: |
ffdb210e | 830 | kfree(table); |
98319cb9 | 831 | err_kzalloc: |
ffdb210e | 832 | return err; |
96518518 PM |
833 | } |
834 | ||
b9ac12ef AB |
835 | static int nft_flush_table(struct nft_ctx *ctx) |
836 | { | |
3b49e2e9 | 837 | struct nft_flowtable *flowtable, *nft; |
b9ac12ef | 838 | struct nft_chain *chain, *nc; |
e5009240 | 839 | struct nft_object *obj, *ne; |
b9ac12ef | 840 | struct nft_set *set, *ns; |
3b49e2e9 | 841 | int err; |
b9ac12ef | 842 | |
a2f18db0 | 843 | list_for_each_entry(chain, &ctx->table->chains, list) { |
664b0f8c PNA |
844 | if (!nft_is_active_next(ctx->net, chain)) |
845 | continue; | |
846 | ||
b9ac12ef AB |
847 | ctx->chain = chain; |
848 | ||
849 | err = nft_delrule_by_chain(ctx); | |
850 | if (err < 0) | |
851 | goto out; | |
b9ac12ef AB |
852 | } |
853 | ||
854 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
37a9cc52 PNA |
855 | if (!nft_is_active_next(ctx->net, set)) |
856 | continue; | |
857 | ||
408070d6 | 858 | if (nft_set_is_anonymous(set) && |
b9ac12ef AB |
859 | !list_empty(&set->bindings)) |
860 | continue; | |
861 | ||
862 | err = nft_delset(ctx, set); | |
863 | if (err < 0) | |
864 | goto out; | |
865 | } | |
866 | ||
3b49e2e9 PNA |
867 | list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) { |
868 | err = nft_delflowtable(ctx, flowtable); | |
869 | if (err < 0) | |
870 | goto out; | |
871 | } | |
872 | ||
e5009240 PNA |
873 | list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { |
874 | err = nft_delobj(ctx, obj); | |
875 | if (err < 0) | |
876 | goto out; | |
877 | } | |
878 | ||
a2f18db0 | 879 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
664b0f8c PNA |
880 | if (!nft_is_active_next(ctx->net, chain)) |
881 | continue; | |
882 | ||
a2f18db0 PNA |
883 | ctx->chain = chain; |
884 | ||
885 | err = nft_delchain(ctx); | |
886 | if (err < 0) | |
887 | goto out; | |
888 | } | |
889 | ||
b9ac12ef AB |
890 | err = nft_deltable(ctx); |
891 | out: | |
892 | return err; | |
893 | } | |
894 | ||
895 | static int nft_flush(struct nft_ctx *ctx, int family) | |
896 | { | |
b9ac12ef AB |
897 | struct nft_table *table, *nt; |
898 | const struct nlattr * const *nla = ctx->nla; | |
899 | int err = 0; | |
900 | ||
36596dad | 901 | list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) { |
98319cb9 | 902 | if (family != AF_UNSPEC && table->family != family) |
b9ac12ef AB |
903 | continue; |
904 | ||
98319cb9 | 905 | ctx->family = table->family; |
f2a6d766 | 906 | |
36596dad PNA |
907 | if (!nft_is_active_next(ctx->net, table)) |
908 | continue; | |
b9ac12ef | 909 | |
36596dad PNA |
910 | if (nla[NFTA_TABLE_NAME] && |
911 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
912 | continue; | |
b9ac12ef | 913 | |
36596dad PNA |
914 | ctx->table = table; |
915 | ||
916 | err = nft_flush_table(ctx); | |
917 | if (err < 0) | |
918 | goto out; | |
b9ac12ef AB |
919 | } |
920 | out: | |
921 | return err; | |
922 | } | |
923 | ||
633c9a84 PNA |
924 | static int nf_tables_deltable(struct net *net, struct sock *nlsk, |
925 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
926 | const struct nlattr * const nla[], |
927 | struct netlink_ext_ack *extack) | |
96518518 PM |
928 | { |
929 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 930 | u8 genmask = nft_genmask_next(net); |
ee01d542 | 931 | int family = nfmsg->nfgen_family; |
36dd1bcc PNA |
932 | const struct nlattr *attr; |
933 | struct nft_table *table; | |
55dd6f93 | 934 | struct nft_ctx ctx; |
96518518 | 935 | |
36596dad | 936 | nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla); |
3ecbfd65 HS |
937 | if (family == AF_UNSPEC || |
938 | (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE])) | |
b9ac12ef AB |
939 | return nft_flush(&ctx, family); |
940 | ||
36dd1bcc PNA |
941 | if (nla[NFTA_TABLE_HANDLE]) { |
942 | attr = nla[NFTA_TABLE_HANDLE]; | |
943 | table = nft_table_lookup_byhandle(net, attr, genmask); | |
944 | } else { | |
945 | attr = nla[NFTA_TABLE_NAME]; | |
946 | table = nft_table_lookup(net, attr, family, genmask); | |
947 | } | |
3ecbfd65 | 948 | |
36dd1bcc PNA |
949 | if (IS_ERR(table)) { |
950 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 951 | return PTR_ERR(table); |
36dd1bcc | 952 | } |
96518518 | 953 | |
a8278400 PNA |
954 | if (nlh->nlmsg_flags & NLM_F_NONREC && |
955 | table->use > 0) | |
956 | return -EBUSY; | |
957 | ||
98319cb9 | 958 | ctx.family = family; |
b9ac12ef | 959 | ctx.table = table; |
55dd6f93 | 960 | |
b9ac12ef | 961 | return nft_flush_table(&ctx); |
96518518 PM |
962 | } |
963 | ||
55dd6f93 PNA |
964 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
965 | { | |
4fefee57 PNA |
966 | BUG_ON(ctx->table->use > 0); |
967 | ||
1b2470e5 | 968 | rhltable_destroy(&ctx->table->chains_ht); |
e46abbcc | 969 | kfree(ctx->table->name); |
55dd6f93 | 970 | kfree(ctx->table); |
55dd6f93 PNA |
971 | } |
972 | ||
cc07eeb0 | 973 | void nft_register_chain_type(const struct nft_chain_type *ctype) |
96518518 | 974 | { |
d8297d4f | 975 | if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO)) |
cc07eeb0 | 976 | return; |
d8297d4f | 977 | |
96518518 | 978 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
cc07eeb0 PNA |
979 | if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) { |
980 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
981 | return; | |
96518518 | 982 | } |
9370761c | 983 | chain_type[ctype->family][ctype->type] = ctype; |
96518518 | 984 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
96518518 | 985 | } |
9370761c | 986 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 987 | |
32537e91 | 988 | void nft_unregister_chain_type(const struct nft_chain_type *ctype) |
96518518 | 989 | { |
96518518 | 990 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 991 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
992 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
993 | } | |
9370761c | 994 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
995 | |
996 | /* | |
997 | * Chains | |
998 | */ | |
999 | ||
1000 | static struct nft_chain * | |
cac20fcd | 1001 | nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask) |
96518518 PM |
1002 | { |
1003 | struct nft_chain *chain; | |
1004 | ||
1005 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
1006 | if (chain->handle == handle && |
1007 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
1008 | return chain; |
1009 | } | |
1010 | ||
1011 | return ERR_PTR(-ENOENT); | |
1012 | } | |
1013 | ||
1b2470e5 | 1014 | static struct nft_chain *nft_chain_lookup(struct nft_table *table, |
cac20fcd | 1015 | const struct nlattr *nla, u8 genmask) |
96518518 | 1016 | { |
1b2470e5 FW |
1017 | char search[NFT_CHAIN_MAXNAMELEN + 1]; |
1018 | struct rhlist_head *tmp, *list; | |
96518518 PM |
1019 | struct nft_chain *chain; |
1020 | ||
1021 | if (nla == NULL) | |
1022 | return ERR_PTR(-EINVAL); | |
1023 | ||
1b2470e5 | 1024 | nla_strlcpy(search, nla, sizeof(search)); |
96518518 | 1025 | |
1b2470e5 FW |
1026 | WARN_ON(!rcu_read_lock_held() && |
1027 | !lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES)); | |
1028 | ||
1029 | chain = ERR_PTR(-ENOENT); | |
1030 | rcu_read_lock(); | |
1031 | list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params); | |
1032 | if (!list) | |
1033 | goto out_unlock; | |
1034 | ||
1035 | rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) { | |
1036 | if (nft_active_genmask(chain, genmask)) | |
1037 | goto out_unlock; | |
1038 | } | |
1039 | chain = ERR_PTR(-ENOENT); | |
1040 | out_unlock: | |
1041 | rcu_read_unlock(); | |
1042 | return chain; | |
96518518 PM |
1043 | } |
1044 | ||
1045 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
b2fbd044 LZ |
1046 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, |
1047 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
1048 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
1049 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
1050 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1051 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 1052 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 1053 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 1054 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
1055 | }; |
1056 | ||
1057 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
1058 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
1059 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
2cbce139 PNA |
1060 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
1061 | .len = IFNAMSIZ - 1 }, | |
96518518 PM |
1062 | }; |
1063 | ||
0ca743a5 PNA |
1064 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
1065 | { | |
1066 | struct nft_stats *cpu_stats, total; | |
1067 | struct nlattr *nest; | |
ce355e20 ED |
1068 | unsigned int seq; |
1069 | u64 pkts, bytes; | |
0ca743a5 PNA |
1070 | int cpu; |
1071 | ||
1072 | memset(&total, 0, sizeof(total)); | |
1073 | for_each_possible_cpu(cpu) { | |
1074 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
1075 | do { |
1076 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
1077 | pkts = cpu_stats->pkts; | |
1078 | bytes = cpu_stats->bytes; | |
1079 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
1080 | total.pkts += pkts; | |
1081 | total.bytes += bytes; | |
0ca743a5 PNA |
1082 | } |
1083 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
1084 | if (nest == NULL) | |
1085 | goto nla_put_failure; | |
1086 | ||
b46f6ded ND |
1087 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), |
1088 | NFTA_COUNTER_PAD) || | |
1089 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), | |
1090 | NFTA_COUNTER_PAD)) | |
0ca743a5 PNA |
1091 | goto nla_put_failure; |
1092 | ||
1093 | nla_nest_end(skb, nest); | |
1094 | return 0; | |
1095 | ||
1096 | nla_put_failure: | |
1097 | return -ENOSPC; | |
1098 | } | |
1099 | ||
84d7fce6 PNA |
1100 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
1101 | u32 portid, u32 seq, int event, u32 flags, | |
1102 | int family, const struct nft_table *table, | |
96518518 PM |
1103 | const struct nft_chain *chain) |
1104 | { | |
1105 | struct nlmsghdr *nlh; | |
1106 | struct nfgenmsg *nfmsg; | |
1107 | ||
dedb67c4 | 1108 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
1109 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
1110 | if (nlh == NULL) | |
1111 | goto nla_put_failure; | |
1112 | ||
1113 | nfmsg = nlmsg_data(nlh); | |
1114 | nfmsg->nfgen_family = family; | |
1115 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1116 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1117 | |
1118 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
1119 | goto nla_put_failure; | |
b46f6ded ND |
1120 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), |
1121 | NFTA_CHAIN_PAD)) | |
96518518 PM |
1122 | goto nla_put_failure; |
1123 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
1124 | goto nla_put_failure; | |
1125 | ||
f323d954 | 1126 | if (nft_is_base_chain(chain)) { |
0ca743a5 | 1127 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
c974a3a3 | 1128 | const struct nf_hook_ops *ops = &basechain->ops; |
0ca743a5 PNA |
1129 | struct nlattr *nest; |
1130 | ||
1131 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
1132 | if (nest == NULL) |
1133 | goto nla_put_failure; | |
1134 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
1135 | goto nla_put_failure; | |
1136 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
1137 | goto nla_put_failure; | |
2cbce139 PNA |
1138 | if (basechain->dev_name[0] && |
1139 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) | |
1140 | goto nla_put_failure; | |
96518518 | 1141 | nla_nest_end(skb, nest); |
9370761c | 1142 | |
0ca743a5 PNA |
1143 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
1144 | htonl(basechain->policy))) | |
1145 | goto nla_put_failure; | |
1146 | ||
baae3e62 PM |
1147 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
1148 | goto nla_put_failure; | |
0ca743a5 | 1149 | |
5f9bfe0e | 1150 | if (basechain->stats && nft_dump_stats(skb, basechain->stats)) |
0ca743a5 | 1151 | goto nla_put_failure; |
96518518 PM |
1152 | } |
1153 | ||
0ca743a5 PNA |
1154 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
1155 | goto nla_put_failure; | |
1156 | ||
053c095a JB |
1157 | nlmsg_end(skb, nlh); |
1158 | return 0; | |
96518518 PM |
1159 | |
1160 | nla_put_failure: | |
1161 | nlmsg_trim(skb, nlh); | |
1162 | return -1; | |
1163 | } | |
1164 | ||
25e94a99 | 1165 | static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
1166 | { |
1167 | struct sk_buff *skb; | |
96518518 PM |
1168 | int err; |
1169 | ||
128ad332 PNA |
1170 | if (!ctx->report && |
1171 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 1172 | return; |
96518518 | 1173 | |
96518518 PM |
1174 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1175 | if (skb == NULL) | |
1176 | goto err; | |
1177 | ||
84d7fce6 | 1178 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 1179 | event, 0, ctx->family, ctx->table, |
35151d84 | 1180 | ctx->chain); |
96518518 PM |
1181 | if (err < 0) { |
1182 | kfree_skb(skb); | |
1183 | goto err; | |
1184 | } | |
1185 | ||
25e94a99 PNA |
1186 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1187 | ctx->report, GFP_KERNEL); | |
1188 | return; | |
96518518 | 1189 | err: |
25e94a99 | 1190 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
1191 | } |
1192 | ||
1193 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1194 | struct netlink_callback *cb) | |
1195 | { | |
1196 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
96518518 PM |
1197 | const struct nft_table *table; |
1198 | const struct nft_chain *chain; | |
1199 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1200 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1201 | int family = nfmsg->nfgen_family; |
1202 | ||
e688a7f8 | 1203 | rcu_read_lock(); |
38e029f1 PNA |
1204 | cb->seq = net->nft.base_seq; |
1205 | ||
36596dad | 1206 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 1207 | if (family != NFPROTO_UNSPEC && family != table->family) |
96518518 PM |
1208 | continue; |
1209 | ||
36596dad PNA |
1210 | list_for_each_entry_rcu(chain, &table->chains, list) { |
1211 | if (idx < s_idx) | |
1212 | goto cont; | |
1213 | if (idx > s_idx) | |
1214 | memset(&cb->args[1], 0, | |
1215 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1216 | if (!nft_is_active(net, chain)) | |
1217 | continue; | |
1218 | if (nf_tables_fill_chain_info(skb, net, | |
1219 | NETLINK_CB(cb->skb).portid, | |
1220 | cb->nlh->nlmsg_seq, | |
1221 | NFT_MSG_NEWCHAIN, | |
1222 | NLM_F_MULTI, | |
98319cb9 | 1223 | table->family, table, |
36596dad PNA |
1224 | chain) < 0) |
1225 | goto done; | |
38e029f1 | 1226 | |
36596dad | 1227 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
96518518 | 1228 | cont: |
36596dad | 1229 | idx++; |
96518518 PM |
1230 | } |
1231 | } | |
1232 | done: | |
e688a7f8 | 1233 | rcu_read_unlock(); |
96518518 PM |
1234 | cb->args[0] = idx; |
1235 | return skb->len; | |
1236 | } | |
1237 | ||
d9adf22a | 1238 | /* called with rcu_read_lock held */ |
7b8002a1 PNA |
1239 | static int nf_tables_getchain(struct net *net, struct sock *nlsk, |
1240 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1241 | const struct nlattr * const nla[], |
1242 | struct netlink_ext_ack *extack) | |
96518518 PM |
1243 | { |
1244 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1245 | u8 genmask = nft_genmask_cur(net); |
96518518 | 1246 | const struct nft_chain *chain; |
1b2470e5 | 1247 | struct nft_table *table; |
96518518 PM |
1248 | struct sk_buff *skb2; |
1249 | int family = nfmsg->nfgen_family; | |
1250 | int err; | |
1251 | ||
1252 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1253 | struct netlink_dump_control c = { | |
1254 | .dump = nf_tables_dump_chains, | |
d9adf22a | 1255 | .module = THIS_MODULE, |
96518518 | 1256 | }; |
d9adf22a FW |
1257 | |
1258 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); | |
96518518 PM |
1259 | } |
1260 | ||
cac20fcd | 1261 | table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask); |
36dd1bcc PNA |
1262 | if (IS_ERR(table)) { |
1263 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); | |
96518518 | 1264 | return PTR_ERR(table); |
36dd1bcc | 1265 | } |
96518518 | 1266 | |
cac20fcd | 1267 | chain = nft_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
36dd1bcc PNA |
1268 | if (IS_ERR(chain)) { |
1269 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); | |
96518518 | 1270 | return PTR_ERR(chain); |
36dd1bcc | 1271 | } |
96518518 | 1272 | |
d9adf22a | 1273 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
96518518 PM |
1274 | if (!skb2) |
1275 | return -ENOMEM; | |
1276 | ||
84d7fce6 | 1277 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1278 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1279 | family, table, chain); | |
1280 | if (err < 0) | |
1281 | goto err; | |
1282 | ||
1283 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1284 | ||
1285 | err: | |
1286 | kfree_skb(skb2); | |
1287 | return err; | |
1288 | } | |
1289 | ||
0ca743a5 PNA |
1290 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1291 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1292 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1293 | }; | |
1294 | ||
ff3cd7b3 | 1295 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1296 | { |
1297 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1298 | struct nft_stats __percpu *newstats; | |
1299 | struct nft_stats *stats; | |
1300 | int err; | |
1301 | ||
fceb6435 JB |
1302 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy, |
1303 | NULL); | |
0ca743a5 | 1304 | if (err < 0) |
ff3cd7b3 | 1305 | return ERR_PTR(err); |
0ca743a5 PNA |
1306 | |
1307 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1308 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1309 | |
ce355e20 | 1310 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1311 | if (newstats == NULL) |
ff3cd7b3 | 1312 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1313 | |
1314 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1315 | * are not exposed to userspace. | |
1316 | */ | |
e8781f70 | 1317 | preempt_disable(); |
0ca743a5 PNA |
1318 | stats = this_cpu_ptr(newstats); |
1319 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1320 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1321 | preempt_enable(); |
0ca743a5 | 1322 | |
ff3cd7b3 PNA |
1323 | return newstats; |
1324 | } | |
1325 | ||
1326 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
1327 | struct nft_stats __percpu *newstats) | |
1328 | { | |
0befd061 PNA |
1329 | struct nft_stats __percpu *oldstats; |
1330 | ||
b88825de PNA |
1331 | if (newstats == NULL) |
1332 | return; | |
1333 | ||
0ca743a5 | 1334 | if (chain->stats) { |
0befd061 | 1335 | oldstats = nfnl_dereference(chain->stats, NFNL_SUBSYS_NFTABLES); |
0ca743a5 PNA |
1336 | rcu_assign_pointer(chain->stats, newstats); |
1337 | synchronize_rcu(); | |
1338 | free_percpu(oldstats); | |
bbb8c61f | 1339 | } else { |
0ca743a5 | 1340 | rcu_assign_pointer(chain->stats, newstats); |
bbb8c61f TY |
1341 | static_branch_inc(&nft_counters_enabled); |
1342 | } | |
0ca743a5 PNA |
1343 | } |
1344 | ||
0cbc06b3 FW |
1345 | static void nf_tables_chain_free_chain_rules(struct nft_chain *chain) |
1346 | { | |
1347 | struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0); | |
1348 | struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1); | |
1349 | ||
1350 | if (g0 != g1) | |
1351 | kvfree(g1); | |
1352 | kvfree(g0); | |
1353 | ||
1354 | /* should be NULL either via abort or via successful commit */ | |
1355 | WARN_ON_ONCE(chain->rules_next); | |
1356 | kvfree(chain->rules_next); | |
1357 | } | |
1358 | ||
43a605f2 | 1359 | static void nf_tables_chain_destroy(struct nft_ctx *ctx) |
91c7b38d | 1360 | { |
43a605f2 PNA |
1361 | struct nft_chain *chain = ctx->chain; |
1362 | ||
91c7b38d PNA |
1363 | BUG_ON(chain->use > 0); |
1364 | ||
0cbc06b3 FW |
1365 | /* no concurrent access possible anymore */ |
1366 | nf_tables_chain_free_chain_rules(chain); | |
1367 | ||
f323d954 | 1368 | if (nft_is_base_chain(chain)) { |
2cbce139 PNA |
1369 | struct nft_base_chain *basechain = nft_base_chain(chain); |
1370 | ||
1371 | module_put(basechain->type->owner); | |
1372 | free_percpu(basechain->stats); | |
9f08ea84 PNA |
1373 | if (basechain->stats) |
1374 | static_branch_dec(&nft_counters_enabled); | |
b7263e07 | 1375 | kfree(chain->name); |
2cbce139 | 1376 | kfree(basechain); |
91c7b38d | 1377 | } else { |
b7263e07 | 1378 | kfree(chain->name); |
91c7b38d PNA |
1379 | kfree(chain); |
1380 | } | |
1381 | } | |
1382 | ||
508f8ccd PNA |
1383 | struct nft_chain_hook { |
1384 | u32 num; | |
84ba7dd7 | 1385 | s32 priority; |
32537e91 | 1386 | const struct nft_chain_type *type; |
508f8ccd PNA |
1387 | struct net_device *dev; |
1388 | }; | |
1389 | ||
1390 | static int nft_chain_parse_hook(struct net *net, | |
1391 | const struct nlattr * const nla[], | |
36596dad PNA |
1392 | struct nft_chain_hook *hook, u8 family, |
1393 | bool create) | |
508f8ccd PNA |
1394 | { |
1395 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; | |
32537e91 | 1396 | const struct nft_chain_type *type; |
508f8ccd PNA |
1397 | struct net_device *dev; |
1398 | int err; | |
1399 | ||
1400 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
fceb6435 | 1401 | nft_hook_policy, NULL); |
508f8ccd PNA |
1402 | if (err < 0) |
1403 | return err; | |
1404 | ||
1405 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1406 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1407 | return -EINVAL; | |
1408 | ||
1409 | hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
508f8ccd PNA |
1410 | hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
1411 | ||
36596dad | 1412 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
508f8ccd | 1413 | if (nla[NFTA_CHAIN_TYPE]) { |
1ea26cca | 1414 | type = nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE], |
36596dad | 1415 | family, create); |
508f8ccd PNA |
1416 | if (IS_ERR(type)) |
1417 | return PTR_ERR(type); | |
1418 | } | |
1419 | if (!(type->hook_mask & (1 << hook->num))) | |
1420 | return -EOPNOTSUPP; | |
84ba7dd7 FW |
1421 | |
1422 | if (type->type == NFT_CHAIN_T_NAT && | |
1423 | hook->priority <= NF_IP_PRI_CONNTRACK) | |
1424 | return -EOPNOTSUPP; | |
1425 | ||
508f8ccd PNA |
1426 | if (!try_module_get(type->owner)) |
1427 | return -ENOENT; | |
1428 | ||
1429 | hook->type = type; | |
1430 | ||
1431 | hook->dev = NULL; | |
36596dad | 1432 | if (family == NFPROTO_NETDEV) { |
508f8ccd PNA |
1433 | char ifname[IFNAMSIZ]; |
1434 | ||
1435 | if (!ha[NFTA_HOOK_DEV]) { | |
1436 | module_put(type->owner); | |
1437 | return -EOPNOTSUPP; | |
1438 | } | |
1439 | ||
1440 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); | |
90d2723c | 1441 | dev = __dev_get_by_name(net, ifname); |
508f8ccd PNA |
1442 | if (!dev) { |
1443 | module_put(type->owner); | |
1444 | return -ENOENT; | |
1445 | } | |
1446 | hook->dev = dev; | |
1447 | } else if (ha[NFTA_HOOK_DEV]) { | |
1448 | module_put(type->owner); | |
1449 | return -EOPNOTSUPP; | |
1450 | } | |
1451 | ||
1452 | return 0; | |
1453 | } | |
1454 | ||
1455 | static void nft_chain_release_hook(struct nft_chain_hook *hook) | |
1456 | { | |
1457 | module_put(hook->type->owner); | |
508f8ccd PNA |
1458 | } |
1459 | ||
0cbc06b3 FW |
1460 | struct nft_rules_old { |
1461 | struct rcu_head h; | |
1462 | struct nft_rule **start; | |
1463 | }; | |
1464 | ||
1465 | static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain, | |
1466 | unsigned int alloc) | |
1467 | { | |
1468 | if (alloc > INT_MAX) | |
1469 | return NULL; | |
1470 | ||
1471 | alloc += 1; /* NULL, ends rules */ | |
1472 | if (sizeof(struct nft_rule *) > INT_MAX / alloc) | |
1473 | return NULL; | |
1474 | ||
1475 | alloc *= sizeof(struct nft_rule *); | |
1476 | alloc += sizeof(struct nft_rules_old); | |
1477 | ||
1478 | return kvmalloc(alloc, GFP_KERNEL); | |
1479 | } | |
1480 | ||
4035285f PNA |
1481 | static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask, |
1482 | u8 policy, bool create) | |
1483 | { | |
1484 | const struct nlattr * const *nla = ctx->nla; | |
1485 | struct nft_table *table = ctx->table; | |
4035285f PNA |
1486 | struct nft_base_chain *basechain; |
1487 | struct nft_stats __percpu *stats; | |
1488 | struct net *net = ctx->net; | |
1489 | struct nft_chain *chain; | |
0cbc06b3 | 1490 | struct nft_rule **rules; |
4035285f PNA |
1491 | int err; |
1492 | ||
1493 | if (table->use == UINT_MAX) | |
1494 | return -EOVERFLOW; | |
1495 | ||
1496 | if (nla[NFTA_CHAIN_HOOK]) { | |
1497 | struct nft_chain_hook hook; | |
1498 | struct nf_hook_ops *ops; | |
4035285f | 1499 | |
36596dad | 1500 | err = nft_chain_parse_hook(net, nla, &hook, family, create); |
4035285f PNA |
1501 | if (err < 0) |
1502 | return err; | |
1503 | ||
1504 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); | |
1505 | if (basechain == NULL) { | |
1506 | nft_chain_release_hook(&hook); | |
1507 | return -ENOMEM; | |
1508 | } | |
1509 | ||
1510 | if (hook.dev != NULL) | |
1511 | strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ); | |
1512 | ||
1513 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1514 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1515 | if (IS_ERR(stats)) { | |
1516 | nft_chain_release_hook(&hook); | |
1517 | kfree(basechain); | |
1518 | return PTR_ERR(stats); | |
1519 | } | |
1520 | basechain->stats = stats; | |
1521 | static_branch_inc(&nft_counters_enabled); | |
1522 | } | |
1523 | ||
4035285f PNA |
1524 | basechain->type = hook.type; |
1525 | chain = &basechain->chain; | |
1526 | ||
c974a3a3 PNA |
1527 | ops = &basechain->ops; |
1528 | ops->pf = family; | |
1529 | ops->hooknum = hook.num; | |
1530 | ops->priority = hook.priority; | |
1531 | ops->priv = chain; | |
c2f9eafe | 1532 | ops->hook = hook.type->hooks[ops->hooknum]; |
c974a3a3 | 1533 | ops->dev = hook.dev; |
c974a3a3 | 1534 | |
4035285f PNA |
1535 | chain->flags |= NFT_BASE_CHAIN; |
1536 | basechain->policy = policy; | |
1537 | } else { | |
1538 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1539 | if (chain == NULL) | |
1540 | return -ENOMEM; | |
1541 | } | |
43a605f2 PNA |
1542 | ctx->chain = chain; |
1543 | ||
4035285f PNA |
1544 | INIT_LIST_HEAD(&chain->rules); |
1545 | chain->handle = nf_tables_alloc_handle(table); | |
1546 | chain->table = table; | |
1547 | chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL); | |
1548 | if (!chain->name) { | |
1549 | err = -ENOMEM; | |
1550 | goto err1; | |
1551 | } | |
1552 | ||
0cbc06b3 FW |
1553 | rules = nf_tables_chain_alloc_rules(chain, 0); |
1554 | if (!rules) { | |
1555 | err = -ENOMEM; | |
1556 | goto err1; | |
1557 | } | |
1558 | ||
1559 | *rules = NULL; | |
1560 | rcu_assign_pointer(chain->rules_gen_0, rules); | |
1561 | rcu_assign_pointer(chain->rules_gen_1, rules); | |
1562 | ||
c974a3a3 | 1563 | err = nf_tables_register_hook(net, table, chain); |
4035285f PNA |
1564 | if (err < 0) |
1565 | goto err1; | |
1566 | ||
1b2470e5 FW |
1567 | err = rhltable_insert_key(&table->chains_ht, chain->name, |
1568 | &chain->rhlhead, nft_chain_ht_params); | |
1569 | if (err) | |
1570 | goto err2; | |
1571 | ||
4035285f | 1572 | err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN); |
1b2470e5 FW |
1573 | if (err < 0) { |
1574 | rhltable_remove(&table->chains_ht, &chain->rhlhead, | |
1575 | nft_chain_ht_params); | |
4035285f | 1576 | goto err2; |
1b2470e5 | 1577 | } |
4035285f PNA |
1578 | |
1579 | table->use++; | |
1580 | list_add_tail_rcu(&chain->list, &table->chains); | |
1581 | ||
1582 | return 0; | |
1583 | err2: | |
c974a3a3 | 1584 | nf_tables_unregister_hook(net, table, chain); |
4035285f | 1585 | err1: |
43a605f2 | 1586 | nf_tables_chain_destroy(ctx); |
4035285f PNA |
1587 | |
1588 | return err; | |
1589 | } | |
1590 | ||
2c4a488a PNA |
1591 | static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy, |
1592 | bool create) | |
1593 | { | |
1594 | const struct nlattr * const *nla = ctx->nla; | |
1595 | struct nft_table *table = ctx->table; | |
1596 | struct nft_chain *chain = ctx->chain; | |
2c4a488a PNA |
1597 | struct nft_base_chain *basechain; |
1598 | struct nft_stats *stats = NULL; | |
1599 | struct nft_chain_hook hook; | |
1600 | const struct nlattr *name; | |
1601 | struct nf_hook_ops *ops; | |
1602 | struct nft_trans *trans; | |
c974a3a3 | 1603 | int err; |
2c4a488a PNA |
1604 | |
1605 | if (nla[NFTA_CHAIN_HOOK]) { | |
1606 | if (!nft_is_base_chain(chain)) | |
1607 | return -EBUSY; | |
1608 | ||
36596dad | 1609 | err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family, |
2c4a488a PNA |
1610 | create); |
1611 | if (err < 0) | |
1612 | return err; | |
1613 | ||
1614 | basechain = nft_base_chain(chain); | |
1615 | if (basechain->type != hook.type) { | |
1616 | nft_chain_release_hook(&hook); | |
1617 | return -EBUSY; | |
1618 | } | |
1619 | ||
c974a3a3 PNA |
1620 | ops = &basechain->ops; |
1621 | if (ops->hooknum != hook.num || | |
1622 | ops->priority != hook.priority || | |
1623 | ops->dev != hook.dev) { | |
1624 | nft_chain_release_hook(&hook); | |
1625 | return -EBUSY; | |
2c4a488a PNA |
1626 | } |
1627 | nft_chain_release_hook(&hook); | |
1628 | } | |
1629 | ||
1630 | if (nla[NFTA_CHAIN_HANDLE] && | |
1631 | nla[NFTA_CHAIN_NAME]) { | |
1632 | struct nft_chain *chain2; | |
1633 | ||
cac20fcd | 1634 | chain2 = nft_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
0d18779b JC |
1635 | if (!IS_ERR(chain2)) |
1636 | return -EEXIST; | |
2c4a488a PNA |
1637 | } |
1638 | ||
1639 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1640 | if (!nft_is_base_chain(chain)) | |
1641 | return -EOPNOTSUPP; | |
1642 | ||
1643 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1644 | if (IS_ERR(stats)) | |
1645 | return PTR_ERR(stats); | |
1646 | } | |
1647 | ||
1648 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, | |
1649 | sizeof(struct nft_trans_chain)); | |
1650 | if (trans == NULL) { | |
1651 | free_percpu(stats); | |
1652 | return -ENOMEM; | |
1653 | } | |
1654 | ||
1655 | nft_trans_chain_stats(trans) = stats; | |
1656 | nft_trans_chain_update(trans) = true; | |
1657 | ||
1658 | if (nla[NFTA_CHAIN_POLICY]) | |
1659 | nft_trans_chain_policy(trans) = policy; | |
1660 | else | |
1661 | nft_trans_chain_policy(trans) = -1; | |
1662 | ||
1663 | name = nla[NFTA_CHAIN_NAME]; | |
1664 | if (nla[NFTA_CHAIN_HANDLE] && name) { | |
1665 | nft_trans_chain_name(trans) = | |
1666 | nla_strdup(name, GFP_KERNEL); | |
1667 | if (!nft_trans_chain_name(trans)) { | |
1668 | kfree(trans); | |
1669 | free_percpu(stats); | |
1670 | return -ENOMEM; | |
1671 | } | |
1672 | } | |
1673 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
1674 | ||
1675 | return 0; | |
1676 | } | |
1677 | ||
633c9a84 PNA |
1678 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
1679 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1680 | const struct nlattr * const nla[], |
1681 | struct netlink_ext_ack *extack) | |
96518518 PM |
1682 | { |
1683 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4035285f PNA |
1684 | u8 genmask = nft_genmask_next(net); |
1685 | int family = nfmsg->nfgen_family; | |
36dd1bcc | 1686 | const struct nlattr *attr; |
96518518 PM |
1687 | struct nft_table *table; |
1688 | struct nft_chain *chain; | |
57de2a0c | 1689 | u8 policy = NF_ACCEPT; |
4035285f | 1690 | struct nft_ctx ctx; |
96518518 | 1691 | u64 handle = 0; |
96518518 PM |
1692 | bool create; |
1693 | ||
1694 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1695 | ||
cac20fcd | 1696 | table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask); |
36dd1bcc PNA |
1697 | if (IS_ERR(table)) { |
1698 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); | |
96518518 | 1699 | return PTR_ERR(table); |
36dd1bcc | 1700 | } |
96518518 | 1701 | |
96518518 | 1702 | chain = NULL; |
36dd1bcc | 1703 | attr = nla[NFTA_CHAIN_NAME]; |
96518518 PM |
1704 | |
1705 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1706 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
cac20fcd | 1707 | chain = nft_chain_lookup_byhandle(table, handle, genmask); |
36dd1bcc PNA |
1708 | if (IS_ERR(chain)) { |
1709 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]); | |
96518518 | 1710 | return PTR_ERR(chain); |
36dd1bcc PNA |
1711 | } |
1712 | attr = nla[NFTA_CHAIN_HANDLE]; | |
96518518 | 1713 | } else { |
36dd1bcc | 1714 | chain = nft_chain_lookup(table, attr, genmask); |
96518518 | 1715 | if (IS_ERR(chain)) { |
36dd1bcc PNA |
1716 | if (PTR_ERR(chain) != -ENOENT) { |
1717 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 1718 | return PTR_ERR(chain); |
36dd1bcc | 1719 | } |
96518518 PM |
1720 | chain = NULL; |
1721 | } | |
1722 | } | |
1723 | ||
57de2a0c | 1724 | if (nla[NFTA_CHAIN_POLICY]) { |
f323d954 | 1725 | if (chain != NULL && |
36dd1bcc PNA |
1726 | !nft_is_base_chain(chain)) { |
1727 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); | |
d6b6cb1d | 1728 | return -EOPNOTSUPP; |
36dd1bcc | 1729 | } |
d6b6cb1d PNA |
1730 | |
1731 | if (chain == NULL && | |
36dd1bcc PNA |
1732 | nla[NFTA_CHAIN_HOOK] == NULL) { |
1733 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); | |
57de2a0c | 1734 | return -EOPNOTSUPP; |
36dd1bcc | 1735 | } |
57de2a0c | 1736 | |
8f46df18 | 1737 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1738 | switch (policy) { |
1739 | case NF_DROP: | |
1740 | case NF_ACCEPT: | |
1741 | break; | |
1742 | default: | |
1743 | return -EINVAL; | |
1744 | } | |
1745 | } | |
1746 | ||
98319cb9 | 1747 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
4035285f | 1748 | |
96518518 | 1749 | if (chain != NULL) { |
36dd1bcc PNA |
1750 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
1751 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 1752 | return -EEXIST; |
36dd1bcc | 1753 | } |
96518518 PM |
1754 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
1755 | return -EOPNOTSUPP; | |
1756 | ||
2c4a488a | 1757 | return nf_tables_updchain(&ctx, genmask, policy, create); |
96518518 PM |
1758 | } |
1759 | ||
4035285f | 1760 | return nf_tables_addchain(&ctx, family, genmask, policy, create); |
96518518 PM |
1761 | } |
1762 | ||
633c9a84 PNA |
1763 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
1764 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1765 | const struct nlattr * const nla[], |
1766 | struct netlink_ext_ack *extack) | |
96518518 PM |
1767 | { |
1768 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1769 | u8 genmask = nft_genmask_next(net); |
36dd1bcc PNA |
1770 | int family = nfmsg->nfgen_family; |
1771 | const struct nlattr *attr; | |
96518518 PM |
1772 | struct nft_table *table; |
1773 | struct nft_chain *chain; | |
9dee1474 | 1774 | struct nft_rule *rule; |
91c7b38d | 1775 | struct nft_ctx ctx; |
3ecbfd65 | 1776 | u64 handle; |
9dee1474 PNA |
1777 | u32 use; |
1778 | int err; | |
96518518 | 1779 | |
cac20fcd | 1780 | table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask); |
36dd1bcc PNA |
1781 | if (IS_ERR(table)) { |
1782 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); | |
96518518 | 1783 | return PTR_ERR(table); |
36dd1bcc | 1784 | } |
96518518 | 1785 | |
3ecbfd65 | 1786 | if (nla[NFTA_CHAIN_HANDLE]) { |
36dd1bcc PNA |
1787 | attr = nla[NFTA_CHAIN_HANDLE]; |
1788 | handle = be64_to_cpu(nla_get_be64(attr)); | |
cac20fcd | 1789 | chain = nft_chain_lookup_byhandle(table, handle, genmask); |
3ecbfd65 | 1790 | } else { |
36dd1bcc PNA |
1791 | attr = nla[NFTA_CHAIN_NAME]; |
1792 | chain = nft_chain_lookup(table, attr, genmask); | |
3ecbfd65 | 1793 | } |
36dd1bcc PNA |
1794 | if (IS_ERR(chain)) { |
1795 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 1796 | return PTR_ERR(chain); |
36dd1bcc | 1797 | } |
9dee1474 PNA |
1798 | |
1799 | if (nlh->nlmsg_flags & NLM_F_NONREC && | |
1800 | chain->use > 0) | |
96518518 PM |
1801 | return -EBUSY; |
1802 | ||
98319cb9 | 1803 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0165d932 | 1804 | |
9dee1474 PNA |
1805 | use = chain->use; |
1806 | list_for_each_entry(rule, &chain->rules, list) { | |
1807 | if (!nft_is_active_next(net, rule)) | |
1808 | continue; | |
1809 | use--; | |
1810 | ||
1811 | err = nft_delrule(&ctx, rule); | |
1812 | if (err < 0) | |
1813 | return err; | |
1814 | } | |
1815 | ||
1816 | /* There are rules and elements that are still holding references to us, | |
1817 | * we cannot do a recursive removal in this case. | |
1818 | */ | |
36dd1bcc PNA |
1819 | if (use > 0) { |
1820 | NL_SET_BAD_ATTR(extack, attr); | |
9dee1474 | 1821 | return -EBUSY; |
36dd1bcc | 1822 | } |
9dee1474 | 1823 | |
ee01d542 | 1824 | return nft_delchain(&ctx); |
96518518 PM |
1825 | } |
1826 | ||
96518518 PM |
1827 | /* |
1828 | * Expressions | |
1829 | */ | |
1830 | ||
1831 | /** | |
ef1f7df9 PM |
1832 | * nft_register_expr - register nf_tables expr type |
1833 | * @ops: expr type | |
96518518 | 1834 | * |
ef1f7df9 | 1835 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1836 | * success or a negative errno code otherwise. |
1837 | */ | |
ef1f7df9 | 1838 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1839 | { |
1840 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1841 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1842 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1843 | else |
e688a7f8 | 1844 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1845 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1846 | return 0; | |
1847 | } | |
1848 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1849 | ||
1850 | /** | |
ef1f7df9 PM |
1851 | * nft_unregister_expr - unregister nf_tables expr type |
1852 | * @ops: expr type | |
96518518 | 1853 | * |
ef1f7df9 | 1854 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1855 | */ |
ef1f7df9 | 1856 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1857 | { |
1858 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1859 | list_del_rcu(&type->list); |
96518518 PM |
1860 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1861 | } | |
1862 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1863 | ||
64d46806 PM |
1864 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1865 | struct nlattr *nla) | |
96518518 | 1866 | { |
ef1f7df9 | 1867 | const struct nft_expr_type *type; |
96518518 | 1868 | |
ef1f7df9 | 1869 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1870 | if (!nla_strcmp(nla, type->name) && |
1871 | (!type->family || type->family == family)) | |
ef1f7df9 | 1872 | return type; |
96518518 PM |
1873 | } |
1874 | return NULL; | |
1875 | } | |
1876 | ||
64d46806 PM |
1877 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1878 | struct nlattr *nla) | |
96518518 | 1879 | { |
ef1f7df9 | 1880 | const struct nft_expr_type *type; |
96518518 PM |
1881 | |
1882 | if (nla == NULL) | |
1883 | return ERR_PTR(-EINVAL); | |
1884 | ||
64d46806 | 1885 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1886 | if (type != NULL && try_module_get(type->owner)) |
1887 | return type; | |
96518518 PM |
1888 | |
1889 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1890 | if (type == NULL) { |
64d46806 PM |
1891 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1892 | request_module("nft-expr-%u-%.*s", family, | |
1893 | nla_len(nla), (char *)nla_data(nla)); | |
1894 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1895 | if (__nft_expr_type_get(family, nla)) | |
1896 | return ERR_PTR(-EAGAIN); | |
1897 | ||
96518518 PM |
1898 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1899 | request_module("nft-expr-%.*s", | |
1900 | nla_len(nla), (char *)nla_data(nla)); | |
1901 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1902 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1903 | return ERR_PTR(-EAGAIN); |
1904 | } | |
1905 | #endif | |
1906 | return ERR_PTR(-ENOENT); | |
1907 | } | |
1908 | ||
1909 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1910 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1911 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1912 | }; | |
1913 | ||
1914 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1915 | const struct nft_expr *expr) | |
1916 | { | |
ef1f7df9 | 1917 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1918 | goto nla_put_failure; |
1919 | ||
1920 | if (expr->ops->dump) { | |
1921 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1922 | if (data == NULL) | |
1923 | goto nla_put_failure; | |
1924 | if (expr->ops->dump(skb, expr) < 0) | |
1925 | goto nla_put_failure; | |
1926 | nla_nest_end(skb, data); | |
1927 | } | |
1928 | ||
1929 | return skb->len; | |
1930 | ||
1931 | nla_put_failure: | |
1932 | return -1; | |
1933 | }; | |
1934 | ||
0b2d8a7b PM |
1935 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
1936 | const struct nft_expr *expr) | |
1937 | { | |
1938 | struct nlattr *nest; | |
1939 | ||
1940 | nest = nla_nest_start(skb, attr); | |
1941 | if (!nest) | |
1942 | goto nla_put_failure; | |
1943 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1944 | goto nla_put_failure; | |
1945 | nla_nest_end(skb, nest); | |
1946 | return 0; | |
1947 | ||
1948 | nla_put_failure: | |
1949 | return -1; | |
1950 | } | |
1951 | ||
96518518 PM |
1952 | struct nft_expr_info { |
1953 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1954 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1955 | }; |
1956 | ||
0ca743a5 PNA |
1957 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1958 | const struct nlattr *nla, | |
96518518 PM |
1959 | struct nft_expr_info *info) |
1960 | { | |
ef1f7df9 | 1961 | const struct nft_expr_type *type; |
96518518 | 1962 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1963 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1964 | int err; |
1965 | ||
fceb6435 | 1966 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL); |
96518518 PM |
1967 | if (err < 0) |
1968 | return err; | |
1969 | ||
36596dad | 1970 | type = nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1971 | if (IS_ERR(type)) |
1972 | return PTR_ERR(type); | |
1973 | ||
1974 | if (tb[NFTA_EXPR_DATA]) { | |
1975 | err = nla_parse_nested(info->tb, type->maxattr, | |
fceb6435 | 1976 | tb[NFTA_EXPR_DATA], type->policy, NULL); |
ef1f7df9 PM |
1977 | if (err < 0) |
1978 | goto err1; | |
1979 | } else | |
1980 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1981 | ||
1982 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1983 | ops = type->select_ops(ctx, |
1984 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1985 | if (IS_ERR(ops)) { |
1986 | err = PTR_ERR(ops); | |
1987 | goto err1; | |
1988 | } | |
1989 | } else | |
1990 | ops = type->ops; | |
1991 | ||
96518518 PM |
1992 | info->ops = ops; |
1993 | return 0; | |
ef1f7df9 PM |
1994 | |
1995 | err1: | |
1996 | module_put(type->owner); | |
1997 | return err; | |
96518518 PM |
1998 | } |
1999 | ||
2000 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 2001 | const struct nft_expr_info *info, |
96518518 PM |
2002 | struct nft_expr *expr) |
2003 | { | |
2004 | const struct nft_expr_ops *ops = info->ops; | |
2005 | int err; | |
2006 | ||
2007 | expr->ops = ops; | |
2008 | if (ops->init) { | |
ef1f7df9 | 2009 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
2010 | if (err < 0) |
2011 | goto err1; | |
2012 | } | |
2013 | ||
96518518 | 2014 | return 0; |
96518518 PM |
2015 | err1: |
2016 | expr->ops = NULL; | |
2017 | return err; | |
2018 | } | |
2019 | ||
62472bce PM |
2020 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
2021 | struct nft_expr *expr) | |
96518518 PM |
2022 | { |
2023 | if (expr->ops->destroy) | |
62472bce | 2024 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 2025 | module_put(expr->ops->type->owner); |
96518518 PM |
2026 | } |
2027 | ||
0b2d8a7b PM |
2028 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
2029 | const struct nlattr *nla) | |
2030 | { | |
2031 | struct nft_expr_info info; | |
2032 | struct nft_expr *expr; | |
2033 | int err; | |
2034 | ||
2035 | err = nf_tables_expr_parse(ctx, nla, &info); | |
2036 | if (err < 0) | |
2037 | goto err1; | |
2038 | ||
2039 | err = -ENOMEM; | |
2040 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
2041 | if (expr == NULL) | |
2042 | goto err2; | |
2043 | ||
2044 | err = nf_tables_newexpr(ctx, &info, expr); | |
2045 | if (err < 0) | |
6cafaf47 | 2046 | goto err3; |
0b2d8a7b PM |
2047 | |
2048 | return expr; | |
6cafaf47 LZ |
2049 | err3: |
2050 | kfree(expr); | |
0b2d8a7b PM |
2051 | err2: |
2052 | module_put(info.ops->type->owner); | |
2053 | err1: | |
2054 | return ERR_PTR(err); | |
2055 | } | |
2056 | ||
2057 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
2058 | { | |
2059 | nf_tables_expr_destroy(ctx, expr); | |
2060 | kfree(expr); | |
2061 | } | |
2062 | ||
96518518 PM |
2063 | /* |
2064 | * Rules | |
2065 | */ | |
2066 | ||
cac20fcd PNA |
2067 | static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain, |
2068 | u64 handle) | |
96518518 PM |
2069 | { |
2070 | struct nft_rule *rule; | |
2071 | ||
2072 | // FIXME: this sucks | |
d9adf22a | 2073 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
96518518 PM |
2074 | if (handle == rule->handle) |
2075 | return rule; | |
2076 | } | |
2077 | ||
2078 | return ERR_PTR(-ENOENT); | |
2079 | } | |
2080 | ||
cac20fcd PNA |
2081 | static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain, |
2082 | const struct nlattr *nla) | |
96518518 PM |
2083 | { |
2084 | if (nla == NULL) | |
2085 | return ERR_PTR(-EINVAL); | |
2086 | ||
cac20fcd | 2087 | return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); |
96518518 PM |
2088 | } |
2089 | ||
2090 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
b2fbd044 LZ |
2091 | [NFTA_RULE_TABLE] = { .type = NLA_STRING, |
2092 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
2093 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
2094 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
2095 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
2096 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 2097 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 2098 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
2099 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
2100 | .len = NFT_USERDATA_MAXLEN }, | |
467697d2 | 2101 | [NFTA_RULE_ID] = { .type = NLA_U32 }, |
96518518 PM |
2102 | }; |
2103 | ||
84d7fce6 PNA |
2104 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
2105 | u32 portid, u32 seq, int event, | |
2106 | u32 flags, int family, | |
96518518 PM |
2107 | const struct nft_table *table, |
2108 | const struct nft_chain *chain, | |
2109 | const struct nft_rule *rule) | |
2110 | { | |
2111 | struct nlmsghdr *nlh; | |
2112 | struct nfgenmsg *nfmsg; | |
2113 | const struct nft_expr *expr, *next; | |
2114 | struct nlattr *list; | |
5e948466 | 2115 | const struct nft_rule *prule; |
dedb67c4 | 2116 | u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 | 2117 | |
dedb67c4 | 2118 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags); |
96518518 PM |
2119 | if (nlh == NULL) |
2120 | goto nla_put_failure; | |
2121 | ||
2122 | nfmsg = nlmsg_data(nlh); | |
2123 | nfmsg->nfgen_family = family; | |
2124 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2125 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
2126 | |
2127 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
2128 | goto nla_put_failure; | |
2129 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
2130 | goto nla_put_failure; | |
b46f6ded ND |
2131 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), |
2132 | NFTA_RULE_PAD)) | |
96518518 PM |
2133 | goto nla_put_failure; |
2134 | ||
5e948466 | 2135 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
cbbb40e2 | 2136 | prule = list_prev_entry(rule, list); |
5e948466 | 2137 | if (nla_put_be64(skb, NFTA_RULE_POSITION, |
b46f6ded ND |
2138 | cpu_to_be64(prule->handle), |
2139 | NFTA_RULE_PAD)) | |
5e948466 EL |
2140 | goto nla_put_failure; |
2141 | } | |
2142 | ||
96518518 PM |
2143 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
2144 | if (list == NULL) | |
2145 | goto nla_put_failure; | |
2146 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 2147 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 2148 | goto nla_put_failure; |
96518518 PM |
2149 | } |
2150 | nla_nest_end(skb, list); | |
2151 | ||
86f1ec32 PM |
2152 | if (rule->udata) { |
2153 | struct nft_userdata *udata = nft_userdata(rule); | |
2154 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
2155 | udata->data) < 0) | |
2156 | goto nla_put_failure; | |
2157 | } | |
0768b3b3 | 2158 | |
053c095a JB |
2159 | nlmsg_end(skb, nlh); |
2160 | return 0; | |
96518518 PM |
2161 | |
2162 | nla_put_failure: | |
2163 | nlmsg_trim(skb, nlh); | |
2164 | return -1; | |
2165 | } | |
2166 | ||
25e94a99 PNA |
2167 | static void nf_tables_rule_notify(const struct nft_ctx *ctx, |
2168 | const struct nft_rule *rule, int event) | |
96518518 PM |
2169 | { |
2170 | struct sk_buff *skb; | |
96518518 PM |
2171 | int err; |
2172 | ||
128ad332 PNA |
2173 | if (!ctx->report && |
2174 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 2175 | return; |
96518518 | 2176 | |
96518518 PM |
2177 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
2178 | if (skb == NULL) | |
2179 | goto err; | |
2180 | ||
84d7fce6 | 2181 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 2182 | event, 0, ctx->family, ctx->table, |
35151d84 | 2183 | ctx->chain, rule); |
96518518 PM |
2184 | if (err < 0) { |
2185 | kfree_skb(skb); | |
2186 | goto err; | |
2187 | } | |
2188 | ||
25e94a99 PNA |
2189 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
2190 | ctx->report, GFP_KERNEL); | |
2191 | return; | |
96518518 | 2192 | err: |
25e94a99 | 2193 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
2194 | } |
2195 | ||
6e1f760e | 2196 | struct nft_rule_dump_ctx { |
e46abbcc | 2197 | char *table; |
b7263e07 | 2198 | char *chain; |
6e1f760e PNA |
2199 | }; |
2200 | ||
96518518 PM |
2201 | static int nf_tables_dump_rules(struct sk_buff *skb, |
2202 | struct netlink_callback *cb) | |
2203 | { | |
2204 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
6e1f760e | 2205 | const struct nft_rule_dump_ctx *ctx = cb->data; |
96518518 PM |
2206 | const struct nft_table *table; |
2207 | const struct nft_chain *chain; | |
2208 | const struct nft_rule *rule; | |
2209 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 2210 | struct net *net = sock_net(skb->sk); |
96518518 PM |
2211 | int family = nfmsg->nfgen_family; |
2212 | ||
e688a7f8 | 2213 | rcu_read_lock(); |
38e029f1 PNA |
2214 | cb->seq = net->nft.base_seq; |
2215 | ||
36596dad | 2216 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 2217 | if (family != NFPROTO_UNSPEC && family != table->family) |
36596dad PNA |
2218 | continue; |
2219 | ||
2220 | if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0) | |
96518518 PM |
2221 | continue; |
2222 | ||
36596dad PNA |
2223 | list_for_each_entry_rcu(chain, &table->chains, list) { |
2224 | if (ctx && ctx->chain && | |
2225 | strcmp(ctx->chain, chain->name) != 0) | |
6e1f760e PNA |
2226 | continue; |
2227 | ||
36596dad PNA |
2228 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
2229 | if (!nft_is_active(net, rule)) | |
2230 | goto cont; | |
2231 | if (idx < s_idx) | |
2232 | goto cont; | |
2233 | if (idx > s_idx) | |
2234 | memset(&cb->args[1], 0, | |
2235 | sizeof(cb->args) - sizeof(cb->args[0])); | |
2236 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, | |
2237 | cb->nlh->nlmsg_seq, | |
2238 | NFT_MSG_NEWRULE, | |
2239 | NLM_F_MULTI | NLM_F_APPEND, | |
98319cb9 | 2240 | table->family, |
36596dad PNA |
2241 | table, chain, rule) < 0) |
2242 | goto done; | |
2243 | ||
2244 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 | 2245 | cont: |
36596dad | 2246 | idx++; |
96518518 PM |
2247 | } |
2248 | } | |
2249 | } | |
2250 | done: | |
e688a7f8 PNA |
2251 | rcu_read_unlock(); |
2252 | ||
96518518 PM |
2253 | cb->args[0] = idx; |
2254 | return skb->len; | |
2255 | } | |
2256 | ||
6e1f760e PNA |
2257 | static int nf_tables_dump_rules_done(struct netlink_callback *cb) |
2258 | { | |
e46abbcc PS |
2259 | struct nft_rule_dump_ctx *ctx = cb->data; |
2260 | ||
2261 | if (ctx) { | |
2262 | kfree(ctx->table); | |
b7263e07 | 2263 | kfree(ctx->chain); |
e46abbcc PS |
2264 | kfree(ctx); |
2265 | } | |
6e1f760e PNA |
2266 | return 0; |
2267 | } | |
2268 | ||
d9adf22a | 2269 | /* called with rcu_read_lock held */ |
7b8002a1 PNA |
2270 | static int nf_tables_getrule(struct net *net, struct sock *nlsk, |
2271 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2272 | const struct nlattr * const nla[], |
2273 | struct netlink_ext_ack *extack) | |
96518518 PM |
2274 | { |
2275 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2276 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
2277 | const struct nft_chain *chain; |
2278 | const struct nft_rule *rule; | |
1b2470e5 | 2279 | struct nft_table *table; |
96518518 PM |
2280 | struct sk_buff *skb2; |
2281 | int family = nfmsg->nfgen_family; | |
2282 | int err; | |
2283 | ||
2284 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2285 | struct netlink_dump_control c = { | |
2286 | .dump = nf_tables_dump_rules, | |
6e1f760e | 2287 | .done = nf_tables_dump_rules_done, |
d9adf22a | 2288 | .module = THIS_MODULE, |
96518518 | 2289 | }; |
6e1f760e PNA |
2290 | |
2291 | if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { | |
2292 | struct nft_rule_dump_ctx *ctx; | |
2293 | ||
d9adf22a | 2294 | ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); |
6e1f760e PNA |
2295 | if (!ctx) |
2296 | return -ENOMEM; | |
2297 | ||
e46abbcc PS |
2298 | if (nla[NFTA_RULE_TABLE]) { |
2299 | ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], | |
d9adf22a | 2300 | GFP_ATOMIC); |
e46abbcc PS |
2301 | if (!ctx->table) { |
2302 | kfree(ctx); | |
2303 | return -ENOMEM; | |
2304 | } | |
2305 | } | |
b7263e07 PS |
2306 | if (nla[NFTA_RULE_CHAIN]) { |
2307 | ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], | |
d9adf22a | 2308 | GFP_ATOMIC); |
b7263e07 PS |
2309 | if (!ctx->chain) { |
2310 | kfree(ctx->table); | |
2311 | kfree(ctx); | |
2312 | return -ENOMEM; | |
2313 | } | |
2314 | } | |
6e1f760e PNA |
2315 | c.data = ctx; |
2316 | } | |
2317 | ||
d9adf22a | 2318 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
96518518 PM |
2319 | } |
2320 | ||
cac20fcd | 2321 | table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask); |
36dd1bcc PNA |
2322 | if (IS_ERR(table)) { |
2323 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); | |
96518518 | 2324 | return PTR_ERR(table); |
36dd1bcc | 2325 | } |
96518518 | 2326 | |
cac20fcd | 2327 | chain = nft_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
36dd1bcc PNA |
2328 | if (IS_ERR(chain)) { |
2329 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); | |
96518518 | 2330 | return PTR_ERR(chain); |
36dd1bcc | 2331 | } |
96518518 | 2332 | |
cac20fcd | 2333 | rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); |
36dd1bcc PNA |
2334 | if (IS_ERR(rule)) { |
2335 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
96518518 | 2336 | return PTR_ERR(rule); |
36dd1bcc | 2337 | } |
96518518 | 2338 | |
d9adf22a | 2339 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
96518518 PM |
2340 | if (!skb2) |
2341 | return -ENOMEM; | |
2342 | ||
84d7fce6 | 2343 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
2344 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
2345 | family, table, chain, rule); | |
2346 | if (err < 0) | |
2347 | goto err; | |
2348 | ||
2349 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2350 | ||
2351 | err: | |
2352 | kfree_skb(skb2); | |
2353 | return err; | |
2354 | } | |
2355 | ||
62472bce PM |
2356 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
2357 | struct nft_rule *rule) | |
96518518 | 2358 | { |
96518518 PM |
2359 | struct nft_expr *expr; |
2360 | ||
2361 | /* | |
2362 | * Careful: some expressions might not be initialized in case this | |
2363 | * is called on error from nf_tables_newrule(). | |
2364 | */ | |
2365 | expr = nft_expr_first(rule); | |
3e38df13 | 2366 | while (expr != nft_expr_last(rule) && expr->ops) { |
62472bce | 2367 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
2368 | expr = nft_expr_next(expr); |
2369 | } | |
2370 | kfree(rule); | |
2371 | } | |
2372 | ||
bb7b40ae PNA |
2373 | static void nf_tables_rule_release(const struct nft_ctx *ctx, |
2374 | struct nft_rule *rule) | |
2375 | { | |
2376 | nft_rule_expr_deactivate(ctx, rule); | |
2377 | nf_tables_rule_destroy(ctx, rule); | |
2378 | } | |
2379 | ||
a654de8f PNA |
2380 | int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain) |
2381 | { | |
2382 | struct nft_expr *expr, *last; | |
2383 | const struct nft_data *data; | |
2384 | struct nft_rule *rule; | |
2385 | int err; | |
2386 | ||
2387 | list_for_each_entry(rule, &chain->rules, list) { | |
2388 | if (!nft_is_active_next(ctx->net, rule)) | |
2389 | continue; | |
2390 | ||
2391 | nft_rule_for_each_expr(expr, last, rule) { | |
2392 | if (!expr->ops->validate) | |
2393 | continue; | |
2394 | ||
2395 | err = expr->ops->validate(ctx, expr, &data); | |
2396 | if (err < 0) | |
2397 | return err; | |
2398 | } | |
2399 | } | |
2400 | ||
2401 | return 0; | |
2402 | } | |
2403 | EXPORT_SYMBOL_GPL(nft_chain_validate); | |
2404 | ||
2405 | static int nft_table_validate(struct net *net, const struct nft_table *table) | |
2406 | { | |
2407 | struct nft_chain *chain; | |
2408 | struct nft_ctx ctx = { | |
2409 | .net = net, | |
2410 | .family = table->family, | |
2411 | }; | |
2412 | int err; | |
2413 | ||
2414 | list_for_each_entry(chain, &table->chains, list) { | |
2415 | if (!nft_is_base_chain(chain)) | |
2416 | continue; | |
2417 | ||
2418 | ctx.chain = chain; | |
2419 | err = nft_chain_validate(&ctx, chain); | |
2420 | if (err < 0) | |
2421 | return err; | |
2422 | } | |
2423 | ||
2424 | return 0; | |
2425 | } | |
2426 | ||
1081d11b PNA |
2427 | #define NFT_RULE_MAXEXPRS 128 |
2428 | ||
2429 | static struct nft_expr_info *info; | |
2430 | ||
633c9a84 PNA |
2431 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
2432 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2433 | const struct nlattr * const nla[], |
2434 | struct netlink_ext_ack *extack) | |
96518518 PM |
2435 | { |
2436 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2437 | u8 genmask = nft_genmask_next(net); |
98319cb9 | 2438 | int family = nfmsg->nfgen_family; |
96518518 PM |
2439 | struct nft_table *table; |
2440 | struct nft_chain *chain; | |
2441 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 2442 | struct nft_userdata *udata; |
1081d11b | 2443 | struct nft_trans *trans = NULL; |
96518518 PM |
2444 | struct nft_expr *expr; |
2445 | struct nft_ctx ctx; | |
2446 | struct nlattr *tmp; | |
86f1ec32 | 2447 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 PM |
2448 | int err, rem; |
2449 | bool create; | |
5e948466 | 2450 | u64 handle, pos_handle; |
96518518 PM |
2451 | |
2452 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
2453 | ||
cac20fcd | 2454 | table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask); |
36dd1bcc PNA |
2455 | if (IS_ERR(table)) { |
2456 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); | |
96518518 | 2457 | return PTR_ERR(table); |
36dd1bcc | 2458 | } |
96518518 | 2459 | |
cac20fcd | 2460 | chain = nft_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
36dd1bcc PNA |
2461 | if (IS_ERR(chain)) { |
2462 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); | |
96518518 | 2463 | return PTR_ERR(chain); |
36dd1bcc | 2464 | } |
96518518 PM |
2465 | |
2466 | if (nla[NFTA_RULE_HANDLE]) { | |
2467 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
cac20fcd | 2468 | rule = __nft_rule_lookup(chain, handle); |
36dd1bcc PNA |
2469 | if (IS_ERR(rule)) { |
2470 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
96518518 | 2471 | return PTR_ERR(rule); |
36dd1bcc | 2472 | } |
96518518 | 2473 | |
36dd1bcc PNA |
2474 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
2475 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
96518518 | 2476 | return -EEXIST; |
36dd1bcc | 2477 | } |
96518518 PM |
2478 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
2479 | old_rule = rule; | |
2480 | else | |
2481 | return -EOPNOTSUPP; | |
2482 | } else { | |
2483 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
2484 | return -EINVAL; | |
2485 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
2486 | |
2487 | if (chain->use == UINT_MAX) | |
2488 | return -EOVERFLOW; | |
96518518 PM |
2489 | } |
2490 | ||
5e948466 EL |
2491 | if (nla[NFTA_RULE_POSITION]) { |
2492 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2493 | return -EOPNOTSUPP; | |
2494 | ||
2495 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
cac20fcd | 2496 | old_rule = __nft_rule_lookup(chain, pos_handle); |
36dd1bcc PNA |
2497 | if (IS_ERR(old_rule)) { |
2498 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]); | |
5e948466 | 2499 | return PTR_ERR(old_rule); |
36dd1bcc | 2500 | } |
5e948466 EL |
2501 | } |
2502 | ||
98319cb9 | 2503 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0ca743a5 | 2504 | |
96518518 PM |
2505 | n = 0; |
2506 | size = 0; | |
2507 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2508 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
2509 | err = -EINVAL; | |
2510 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2511 | goto err1; | |
2512 | if (n == NFT_RULE_MAXEXPRS) | |
2513 | goto err1; | |
0ca743a5 | 2514 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2515 | if (err < 0) |
2516 | goto err1; | |
2517 | size += info[n].ops->size; | |
2518 | n++; | |
2519 | } | |
2520 | } | |
9889840f PM |
2521 | /* Check for overflow of dlen field */ |
2522 | err = -EFBIG; | |
2523 | if (size >= 1 << 12) | |
2524 | goto err1; | |
96518518 | 2525 | |
86f1ec32 | 2526 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2527 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2528 | if (ulen > 0) |
2529 | usize = sizeof(struct nft_userdata) + ulen; | |
2530 | } | |
0768b3b3 | 2531 | |
96518518 | 2532 | err = -ENOMEM; |
86f1ec32 | 2533 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2534 | if (rule == NULL) |
2535 | goto err1; | |
2536 | ||
889f7ee7 | 2537 | nft_activate_next(net, rule); |
0628b123 | 2538 | |
96518518 PM |
2539 | rule->handle = handle; |
2540 | rule->dlen = size; | |
86f1ec32 | 2541 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2542 | |
86f1ec32 PM |
2543 | if (ulen) { |
2544 | udata = nft_userdata(rule); | |
2545 | udata->len = ulen - 1; | |
2546 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2547 | } | |
96518518 | 2548 | |
96518518 PM |
2549 | expr = nft_expr_first(rule); |
2550 | for (i = 0; i < n; i++) { | |
2551 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2552 | if (err < 0) | |
2553 | goto err2; | |
a654de8f PNA |
2554 | |
2555 | if (info[i].ops->validate) | |
2556 | nft_validate_state_update(net, NFT_VALIDATE_NEED); | |
2557 | ||
ef1f7df9 | 2558 | info[i].ops = NULL; |
96518518 PM |
2559 | expr = nft_expr_next(expr); |
2560 | } | |
2561 | ||
96518518 | 2562 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
569ccae6 | 2563 | if (!nft_is_active_next(net, old_rule)) { |
0628b123 PNA |
2564 | err = -ENOENT; |
2565 | goto err2; | |
2566 | } | |
569ccae6 FW |
2567 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
2568 | old_rule); | |
2569 | if (trans == NULL) { | |
2570 | err = -ENOMEM; | |
2571 | goto err2; | |
2572 | } | |
2573 | nft_deactivate_next(net, old_rule); | |
2574 | chain->use--; | |
96518518 | 2575 | |
569ccae6 FW |
2576 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
2577 | err = -ENOMEM; | |
2578 | goto err2; | |
2579 | } | |
2580 | ||
2581 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2582 | } else { | |
2583 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { | |
2584 | err = -ENOMEM; | |
2585 | goto err2; | |
2586 | } | |
2587 | ||
2588 | if (nlh->nlmsg_flags & NLM_F_APPEND) { | |
2589 | if (old_rule) | |
2590 | list_add_rcu(&rule->list, &old_rule->list); | |
2591 | else | |
2592 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2593 | } else { | |
2594 | if (old_rule) | |
2595 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2596 | else | |
2597 | list_add_rcu(&rule->list, &chain->rules); | |
2598 | } | |
0628b123 | 2599 | } |
4fefee57 | 2600 | chain->use++; |
96518518 | 2601 | |
a654de8f PNA |
2602 | if (net->nft.validate_state == NFT_VALIDATE_DO) |
2603 | return nft_table_validate(net, table); | |
2604 | ||
2605 | return 0; | |
96518518 | 2606 | err2: |
bb7b40ae | 2607 | nf_tables_rule_release(&ctx, rule); |
96518518 PM |
2608 | err1: |
2609 | for (i = 0; i < n; i++) { | |
2610 | if (info[i].ops != NULL) | |
ef1f7df9 | 2611 | module_put(info[i].ops->type->owner); |
96518518 PM |
2612 | } |
2613 | return err; | |
2614 | } | |
2615 | ||
1a94e38d PNA |
2616 | static struct nft_rule *nft_rule_lookup_byid(const struct net *net, |
2617 | const struct nlattr *nla) | |
2618 | { | |
2619 | u32 id = ntohl(nla_get_be32(nla)); | |
2620 | struct nft_trans *trans; | |
2621 | ||
2622 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
2623 | struct nft_rule *rule = nft_trans_rule(trans); | |
2624 | ||
2625 | if (trans->msg_type == NFT_MSG_NEWRULE && | |
2626 | id == nft_trans_rule_id(trans)) | |
2627 | return rule; | |
2628 | } | |
2629 | return ERR_PTR(-ENOENT); | |
2630 | } | |
2631 | ||
633c9a84 PNA |
2632 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
2633 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2634 | const struct nlattr * const nla[], |
2635 | struct netlink_ext_ack *extack) | |
96518518 PM |
2636 | { |
2637 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2638 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2639 | struct nft_table *table; |
cf9dc09d PNA |
2640 | struct nft_chain *chain = NULL; |
2641 | struct nft_rule *rule; | |
0628b123 PNA |
2642 | int family = nfmsg->nfgen_family, err = 0; |
2643 | struct nft_ctx ctx; | |
96518518 | 2644 | |
cac20fcd | 2645 | table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask); |
36dd1bcc PNA |
2646 | if (IS_ERR(table)) { |
2647 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); | |
96518518 | 2648 | return PTR_ERR(table); |
36dd1bcc | 2649 | } |
96518518 | 2650 | |
cf9dc09d | 2651 | if (nla[NFTA_RULE_CHAIN]) { |
cac20fcd | 2652 | chain = nft_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
36dd1bcc PNA |
2653 | if (IS_ERR(chain)) { |
2654 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); | |
cf9dc09d | 2655 | return PTR_ERR(chain); |
36dd1bcc | 2656 | } |
cf9dc09d | 2657 | } |
96518518 | 2658 | |
98319cb9 | 2659 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0628b123 | 2660 | |
cf9dc09d PNA |
2661 | if (chain) { |
2662 | if (nla[NFTA_RULE_HANDLE]) { | |
cac20fcd | 2663 | rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); |
36dd1bcc PNA |
2664 | if (IS_ERR(rule)) { |
2665 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
cf9dc09d | 2666 | return PTR_ERR(rule); |
36dd1bcc | 2667 | } |
96518518 | 2668 | |
1a94e38d PNA |
2669 | err = nft_delrule(&ctx, rule); |
2670 | } else if (nla[NFTA_RULE_ID]) { | |
2671 | rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]); | |
36dd1bcc PNA |
2672 | if (IS_ERR(rule)) { |
2673 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]); | |
1a94e38d | 2674 | return PTR_ERR(rule); |
36dd1bcc | 2675 | } |
1a94e38d | 2676 | |
5e266fe7 | 2677 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2678 | } else { |
ce24b721 | 2679 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2680 | } |
2681 | } else { | |
2682 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
2683 | if (!nft_is_active_next(net, chain)) |
2684 | continue; | |
2685 | ||
cf9dc09d | 2686 | ctx.chain = chain; |
ce24b721 | 2687 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2688 | if (err < 0) |
2689 | break; | |
2690 | } | |
2691 | } | |
2692 | ||
2693 | return err; | |
2694 | } | |
2695 | ||
20a69341 PM |
2696 | /* |
2697 | * Sets | |
2698 | */ | |
2699 | ||
2b664957 | 2700 | static LIST_HEAD(nf_tables_set_types); |
20a69341 | 2701 | |
2b664957 | 2702 | int nft_register_set(struct nft_set_type *type) |
20a69341 PM |
2703 | { |
2704 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2705 | list_add_tail_rcu(&type->list, &nf_tables_set_types); |
20a69341 PM |
2706 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2707 | return 0; | |
2708 | } | |
2709 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2710 | ||
2b664957 | 2711 | void nft_unregister_set(struct nft_set_type *type) |
20a69341 PM |
2712 | { |
2713 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2714 | list_del_rcu(&type->list); |
20a69341 PM |
2715 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2716 | } | |
2717 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2718 | ||
2b664957 | 2719 | #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ |
71cc0873 PS |
2720 | NFT_SET_TIMEOUT | NFT_SET_OBJECT | \ |
2721 | NFT_SET_EVAL) | |
2b664957 | 2722 | |
71cc0873 | 2723 | static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags) |
2b664957 | 2724 | { |
71cc0873 | 2725 | return (flags & type->features) == (flags & NFT_SET_FEATURES); |
2b664957 PNA |
2726 | } |
2727 | ||
c50b960c PM |
2728 | /* |
2729 | * Select a set implementation based on the data characteristics and the | |
2730 | * given policy. The total memory use might not be known if no size is | |
2731 | * given, in that case the amount of memory per element is used. | |
2732 | */ | |
2733 | static const struct nft_set_ops * | |
2b664957 PNA |
2734 | nft_select_set_ops(const struct nft_ctx *ctx, |
2735 | const struct nlattr * const nla[], | |
c50b960c PM |
2736 | const struct nft_set_desc *desc, |
2737 | enum nft_set_policies policy) | |
20a69341 | 2738 | { |
c50b960c PM |
2739 | const struct nft_set_ops *ops, *bops; |
2740 | struct nft_set_estimate est, best; | |
2b664957 PNA |
2741 | const struct nft_set_type *type; |
2742 | u32 flags = 0; | |
20a69341 PM |
2743 | |
2744 | #ifdef CONFIG_MODULES | |
2b664957 | 2745 | if (list_empty(&nf_tables_set_types)) { |
20a69341 PM |
2746 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2747 | request_module("nft-set"); | |
2748 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2749 | if (!list_empty(&nf_tables_set_types)) |
20a69341 PM |
2750 | return ERR_PTR(-EAGAIN); |
2751 | } | |
2752 | #endif | |
2b664957 PNA |
2753 | if (nla[NFTA_SET_FLAGS] != NULL) |
2754 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
20a69341 | 2755 | |
55af753c PNA |
2756 | bops = NULL; |
2757 | best.size = ~0; | |
2758 | best.lookup = ~0; | |
0b5a7874 | 2759 | best.space = ~0; |
c50b960c | 2760 | |
2b664957 | 2761 | list_for_each_entry(type, &nf_tables_set_types, list) { |
71cc0873 | 2762 | ops = &type->ops; |
2b664957 | 2763 | |
71cc0873 | 2764 | if (!nft_set_ops_candidate(type, flags)) |
20a69341 | 2765 | continue; |
2b664957 | 2766 | if (!ops->estimate(desc, flags, &est)) |
c50b960c PM |
2767 | continue; |
2768 | ||
2769 | switch (policy) { | |
2770 | case NFT_SET_POL_PERFORMANCE: | |
55af753c | 2771 | if (est.lookup < best.lookup) |
c50b960c | 2772 | break; |
644e334e PNA |
2773 | if (est.lookup == best.lookup && |
2774 | est.space < best.space) | |
2775 | break; | |
c50b960c PM |
2776 | continue; |
2777 | case NFT_SET_POL_MEMORY: | |
0b5a7874 PNA |
2778 | if (!desc->size) { |
2779 | if (est.space < best.space) | |
2780 | break; | |
2781 | if (est.space == best.space && | |
2782 | est.lookup < best.lookup) | |
2783 | break; | |
4f2921ca | 2784 | } else if (est.size < best.size || !bops) { |
c50b960c | 2785 | break; |
0b5a7874 | 2786 | } |
c50b960c PM |
2787 | continue; |
2788 | default: | |
2789 | break; | |
2790 | } | |
2791 | ||
2b664957 | 2792 | if (!try_module_get(type->owner)) |
20a69341 | 2793 | continue; |
c50b960c | 2794 | if (bops != NULL) |
71cc0873 | 2795 | module_put(to_set_type(bops)->owner); |
c50b960c PM |
2796 | |
2797 | bops = ops; | |
2798 | best = est; | |
20a69341 PM |
2799 | } |
2800 | ||
c50b960c PM |
2801 | if (bops != NULL) |
2802 | return bops; | |
2803 | ||
20a69341 PM |
2804 | return ERR_PTR(-EOPNOTSUPP); |
2805 | } | |
2806 | ||
2807 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
b2fbd044 LZ |
2808 | [NFTA_SET_TABLE] = { .type = NLA_STRING, |
2809 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
a9bdd836 | 2810 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
cb39ad8b | 2811 | .len = NFT_SET_MAXNAMELEN - 1 }, |
20a69341 PM |
2812 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2813 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2814 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2815 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2816 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2817 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2818 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2819 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2820 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2821 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
e6d8ecac CFG |
2822 | [NFTA_SET_USERDATA] = { .type = NLA_BINARY, |
2823 | .len = NFT_USERDATA_MAXLEN }, | |
8aeff920 | 2824 | [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, |
3ecbfd65 | 2825 | [NFTA_SET_HANDLE] = { .type = NLA_U64 }, |
c50b960c PM |
2826 | }; |
2827 | ||
2828 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2829 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2830 | }; |
2831 | ||
633c9a84 | 2832 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
2833 | const struct sk_buff *skb, |
2834 | const struct nlmsghdr *nlh, | |
f2a6d766 | 2835 | const struct nlattr * const nla[], |
36dd1bcc | 2836 | struct netlink_ext_ack *extack, |
f2a6d766 | 2837 | u8 genmask) |
20a69341 PM |
2838 | { |
2839 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
98319cb9 | 2840 | int family = nfmsg->nfgen_family; |
7c95f6d8 | 2841 | struct nft_table *table = NULL; |
20a69341 | 2842 | |
20a69341 | 2843 | if (nla[NFTA_SET_TABLE] != NULL) { |
cac20fcd PNA |
2844 | table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, |
2845 | genmask); | |
36dd1bcc PNA |
2846 | if (IS_ERR(table)) { |
2847 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); | |
20a69341 | 2848 | return PTR_ERR(table); |
36dd1bcc | 2849 | } |
20a69341 PM |
2850 | } |
2851 | ||
98319cb9 | 2852 | nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 PM |
2853 | return 0; |
2854 | } | |
2855 | ||
cac20fcd PNA |
2856 | static struct nft_set *nft_set_lookup(const struct nft_table *table, |
2857 | const struct nlattr *nla, u8 genmask) | |
20a69341 PM |
2858 | { |
2859 | struct nft_set *set; | |
2860 | ||
2861 | if (nla == NULL) | |
2862 | return ERR_PTR(-EINVAL); | |
2863 | ||
d9adf22a | 2864 | list_for_each_entry_rcu(set, &table->sets, list) { |
37a9cc52 PNA |
2865 | if (!nla_strcmp(nla, set->name) && |
2866 | nft_active_genmask(set, genmask)) | |
20a69341 PM |
2867 | return set; |
2868 | } | |
2869 | return ERR_PTR(-ENOENT); | |
2870 | } | |
2871 | ||
cac20fcd PNA |
2872 | static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table, |
2873 | const struct nlattr *nla, | |
2874 | u8 genmask) | |
3ecbfd65 HS |
2875 | { |
2876 | struct nft_set *set; | |
2877 | ||
3ecbfd65 HS |
2878 | list_for_each_entry(set, &table->sets, list) { |
2879 | if (be64_to_cpu(nla_get_be64(nla)) == set->handle && | |
2880 | nft_active_genmask(set, genmask)) | |
2881 | return set; | |
2882 | } | |
2883 | return ERR_PTR(-ENOENT); | |
2884 | } | |
2885 | ||
cac20fcd PNA |
2886 | static struct nft_set *nft_set_lookup_byid(const struct net *net, |
2887 | const struct nlattr *nla, u8 genmask) | |
958bee14 PNA |
2888 | { |
2889 | struct nft_trans *trans; | |
2890 | u32 id = ntohl(nla_get_be32(nla)); | |
2891 | ||
2892 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
37a9cc52 PNA |
2893 | struct nft_set *set = nft_trans_set(trans); |
2894 | ||
958bee14 | 2895 | if (trans->msg_type == NFT_MSG_NEWSET && |
37a9cc52 PNA |
2896 | id == nft_trans_set_id(trans) && |
2897 | nft_active_genmask(set, genmask)) | |
2898 | return set; | |
958bee14 PNA |
2899 | } |
2900 | return ERR_PTR(-ENOENT); | |
2901 | } | |
c7a72e3f | 2902 | |
10659cba PNA |
2903 | struct nft_set *nft_set_lookup_global(const struct net *net, |
2904 | const struct nft_table *table, | |
2905 | const struct nlattr *nla_set_name, | |
2906 | const struct nlattr *nla_set_id, | |
2907 | u8 genmask) | |
c7a72e3f PNA |
2908 | { |
2909 | struct nft_set *set; | |
2910 | ||
cac20fcd | 2911 | set = nft_set_lookup(table, nla_set_name, genmask); |
c7a72e3f PNA |
2912 | if (IS_ERR(set)) { |
2913 | if (!nla_set_id) | |
2914 | return set; | |
2915 | ||
cac20fcd | 2916 | set = nft_set_lookup_byid(net, nla_set_id, genmask); |
c7a72e3f PNA |
2917 | } |
2918 | return set; | |
2919 | } | |
10659cba | 2920 | EXPORT_SYMBOL_GPL(nft_set_lookup_global); |
958bee14 | 2921 | |
20a69341 PM |
2922 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
2923 | const char *name) | |
2924 | { | |
2925 | const struct nft_set *i; | |
2926 | const char *p; | |
2927 | unsigned long *inuse; | |
60eb1894 | 2928 | unsigned int n = 0, min = 0; |
20a69341 | 2929 | |
38745490 | 2930 | p = strchr(name, '%'); |
20a69341 PM |
2931 | if (p != NULL) { |
2932 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2933 | return -EINVAL; | |
2934 | ||
2935 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2936 | if (inuse == NULL) | |
2937 | return -ENOMEM; | |
60eb1894 | 2938 | cont: |
20a69341 | 2939 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2940 | int tmp; |
2941 | ||
37a9cc52 PNA |
2942 | if (!nft_is_active_next(ctx->net, set)) |
2943 | continue; | |
14662917 | 2944 | if (!sscanf(i->name, name, &tmp)) |
20a69341 | 2945 | continue; |
60eb1894 | 2946 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2947 | continue; |
14662917 | 2948 | |
60eb1894 | 2949 | set_bit(tmp - min, inuse); |
20a69341 PM |
2950 | } |
2951 | ||
53b70287 | 2952 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2953 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2954 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2955 | memset(inuse, 0, PAGE_SIZE); | |
2956 | goto cont; | |
2957 | } | |
20a69341 PM |
2958 | free_page((unsigned long)inuse); |
2959 | } | |
2960 | ||
38745490 PS |
2961 | set->name = kasprintf(GFP_KERNEL, name, min + n); |
2962 | if (!set->name) | |
2963 | return -ENOMEM; | |
2964 | ||
20a69341 | 2965 | list_for_each_entry(i, &ctx->table->sets, list) { |
37a9cc52 PNA |
2966 | if (!nft_is_active_next(ctx->net, i)) |
2967 | continue; | |
e63aaaa6 AY |
2968 | if (!strcmp(set->name, i->name)) { |
2969 | kfree(set->name); | |
20a69341 | 2970 | return -ENFILE; |
e63aaaa6 | 2971 | } |
20a69341 PM |
2972 | } |
2973 | return 0; | |
2974 | } | |
2975 | ||
8e1102d5 FW |
2976 | static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result) |
2977 | { | |
2978 | u64 ms = be64_to_cpu(nla_get_be64(nla)); | |
2979 | u64 max = (u64)(~((u64)0)); | |
2980 | ||
2981 | max = div_u64(max, NSEC_PER_MSEC); | |
2982 | if (ms >= max) | |
2983 | return -ERANGE; | |
2984 | ||
2985 | ms *= NSEC_PER_MSEC; | |
2986 | *result = nsecs_to_jiffies64(ms); | |
2987 | return 0; | |
2988 | } | |
2989 | ||
d6501de8 | 2990 | static __be64 nf_jiffies64_to_msecs(u64 input) |
8e1102d5 FW |
2991 | { |
2992 | u64 ms = jiffies64_to_nsecs(input); | |
2993 | ||
2994 | return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC)); | |
2995 | } | |
2996 | ||
20a69341 PM |
2997 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, |
2998 | const struct nft_set *set, u16 event, u16 flags) | |
2999 | { | |
3000 | struct nfgenmsg *nfmsg; | |
3001 | struct nlmsghdr *nlh; | |
c50b960c | 3002 | struct nlattr *desc; |
128ad332 PNA |
3003 | u32 portid = ctx->portid; |
3004 | u32 seq = ctx->seq; | |
20a69341 | 3005 | |
dedb67c4 | 3006 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
20a69341 PM |
3007 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
3008 | flags); | |
3009 | if (nlh == NULL) | |
3010 | goto nla_put_failure; | |
3011 | ||
3012 | nfmsg = nlmsg_data(nlh); | |
36596dad | 3013 | nfmsg->nfgen_family = ctx->family; |
20a69341 | 3014 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 3015 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
3016 | |
3017 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3018 | goto nla_put_failure; | |
3019 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3020 | goto nla_put_failure; | |
3ecbfd65 HS |
3021 | if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle), |
3022 | NFTA_SET_PAD)) | |
3023 | goto nla_put_failure; | |
20a69341 PM |
3024 | if (set->flags != 0) |
3025 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
3026 | goto nla_put_failure; | |
3027 | ||
3028 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
3029 | goto nla_put_failure; | |
3030 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
3031 | goto nla_put_failure; | |
3032 | if (set->flags & NFT_SET_MAP) { | |
3033 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
3034 | goto nla_put_failure; | |
3035 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
3036 | goto nla_put_failure; | |
3037 | } | |
8aeff920 PNA |
3038 | if (set->flags & NFT_SET_OBJECT && |
3039 | nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) | |
3040 | goto nla_put_failure; | |
20a69341 | 3041 | |
761da293 | 3042 | if (set->timeout && |
d3e2a111 | 3043 | nla_put_be64(skb, NFTA_SET_TIMEOUT, |
8e1102d5 | 3044 | nf_jiffies64_to_msecs(set->timeout), |
b46f6ded | 3045 | NFTA_SET_PAD)) |
761da293 PM |
3046 | goto nla_put_failure; |
3047 | if (set->gc_int && | |
3048 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
3049 | goto nla_put_failure; | |
3050 | ||
9363dc4b AB |
3051 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
3052 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
3053 | goto nla_put_failure; | |
3054 | } | |
3055 | ||
e6d8ecac CFG |
3056 | if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) |
3057 | goto nla_put_failure; | |
3058 | ||
c50b960c PM |
3059 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
3060 | if (desc == NULL) | |
3061 | goto nla_put_failure; | |
3062 | if (set->size && | |
3063 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
3064 | goto nla_put_failure; | |
3065 | nla_nest_end(skb, desc); | |
3066 | ||
053c095a JB |
3067 | nlmsg_end(skb, nlh); |
3068 | return 0; | |
20a69341 PM |
3069 | |
3070 | nla_put_failure: | |
3071 | nlmsg_trim(skb, nlh); | |
3072 | return -1; | |
3073 | } | |
3074 | ||
25e94a99 PNA |
3075 | static void nf_tables_set_notify(const struct nft_ctx *ctx, |
3076 | const struct nft_set *set, int event, | |
3077 | gfp_t gfp_flags) | |
20a69341 PM |
3078 | { |
3079 | struct sk_buff *skb; | |
128ad332 | 3080 | u32 portid = ctx->portid; |
20a69341 PM |
3081 | int err; |
3082 | ||
128ad332 PNA |
3083 | if (!ctx->report && |
3084 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 3085 | return; |
20a69341 | 3086 | |
31f8441c | 3087 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
3088 | if (skb == NULL) |
3089 | goto err; | |
3090 | ||
3091 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
3092 | if (err < 0) { | |
3093 | kfree_skb(skb); | |
3094 | goto err; | |
3095 | } | |
3096 | ||
25e94a99 PNA |
3097 | nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report, |
3098 | gfp_flags); | |
3099 | return; | |
20a69341 | 3100 | err: |
25e94a99 | 3101 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
20a69341 PM |
3102 | } |
3103 | ||
5b96af77 | 3104 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
3105 | { |
3106 | const struct nft_set *set; | |
3107 | unsigned int idx, s_idx = cb->args[0]; | |
c9c8e485 PNA |
3108 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
3109 | struct net *net = sock_net(skb->sk); | |
5b96af77 | 3110 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
3111 | |
3112 | if (cb->args[1]) | |
3113 | return skb->len; | |
3114 | ||
e688a7f8 | 3115 | rcu_read_lock(); |
38e029f1 PNA |
3116 | cb->seq = net->nft.base_seq; |
3117 | ||
36596dad PNA |
3118 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
3119 | if (ctx->family != NFPROTO_UNSPEC && | |
98319cb9 | 3120 | ctx->family != table->family) |
36596dad PNA |
3121 | continue; |
3122 | ||
3123 | if (ctx->table && ctx->table != table) | |
5b96af77 PNA |
3124 | continue; |
3125 | ||
36596dad PNA |
3126 | if (cur_table) { |
3127 | if (cur_table != table) | |
c9c8e485 PNA |
3128 | continue; |
3129 | ||
36596dad | 3130 | cur_table = NULL; |
c9c8e485 | 3131 | } |
36596dad PNA |
3132 | idx = 0; |
3133 | list_for_each_entry_rcu(set, &table->sets, list) { | |
3134 | if (idx < s_idx) | |
3135 | goto cont; | |
3136 | if (!nft_is_active(net, set)) | |
3137 | goto cont; | |
5b96af77 | 3138 | |
36596dad PNA |
3139 | ctx_set = *ctx; |
3140 | ctx_set.table = table; | |
98319cb9 | 3141 | ctx_set.family = table->family; |
c9c8e485 | 3142 | |
36596dad PNA |
3143 | if (nf_tables_fill_set(skb, &ctx_set, set, |
3144 | NFT_MSG_NEWSET, | |
3145 | NLM_F_MULTI) < 0) { | |
3146 | cb->args[0] = idx; | |
3147 | cb->args[2] = (unsigned long) table; | |
3148 | goto done; | |
c9c8e485 | 3149 | } |
36596dad | 3150 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 | 3151 | cont: |
36596dad | 3152 | idx++; |
c9c8e485 | 3153 | } |
36596dad PNA |
3154 | if (s_idx) |
3155 | s_idx = 0; | |
c9c8e485 PNA |
3156 | } |
3157 | cb->args[1] = 1; | |
3158 | done: | |
e688a7f8 | 3159 | rcu_read_unlock(); |
c9c8e485 PNA |
3160 | return skb->len; |
3161 | } | |
3162 | ||
5b96af77 | 3163 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 3164 | { |
5b96af77 PNA |
3165 | kfree(cb->data); |
3166 | return 0; | |
20a69341 PM |
3167 | } |
3168 | ||
d9adf22a | 3169 | /* called with rcu_read_lock held */ |
7b8002a1 PNA |
3170 | static int nf_tables_getset(struct net *net, struct sock *nlsk, |
3171 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3172 | const struct nlattr * const nla[], |
3173 | struct netlink_ext_ack *extack) | |
20a69341 | 3174 | { |
f2a6d766 | 3175 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
3176 | const struct nft_set *set; |
3177 | struct nft_ctx ctx; | |
3178 | struct sk_buff *skb2; | |
c9c8e485 | 3179 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
3180 | int err; |
3181 | ||
01cfa0a4 | 3182 | /* Verify existence before starting dump */ |
36dd1bcc PNA |
3183 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack, |
3184 | genmask); | |
20a69341 PM |
3185 | if (err < 0) |
3186 | return err; | |
3187 | ||
3188 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3189 | struct netlink_dump_control c = { | |
3190 | .dump = nf_tables_dump_sets, | |
5b96af77 | 3191 | .done = nf_tables_dump_sets_done, |
d9adf22a | 3192 | .module = THIS_MODULE, |
20a69341 | 3193 | }; |
5b96af77 PNA |
3194 | struct nft_ctx *ctx_dump; |
3195 | ||
d9adf22a | 3196 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_ATOMIC); |
5b96af77 PNA |
3197 | if (ctx_dump == NULL) |
3198 | return -ENOMEM; | |
3199 | ||
3200 | *ctx_dump = ctx; | |
3201 | c.data = ctx_dump; | |
3202 | ||
d9adf22a | 3203 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
20a69341 PM |
3204 | } |
3205 | ||
c9c8e485 PNA |
3206 | /* Only accept unspec with dump */ |
3207 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
3208 | return -EAFNOSUPPORT; | |
eaa2bcd6 PT |
3209 | if (!nla[NFTA_SET_TABLE]) |
3210 | return -EINVAL; | |
c9c8e485 | 3211 | |
cac20fcd | 3212 | set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3213 | if (IS_ERR(set)) |
3214 | return PTR_ERR(set); | |
3215 | ||
d9adf22a | 3216 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
20a69341 PM |
3217 | if (skb2 == NULL) |
3218 | return -ENOMEM; | |
3219 | ||
3220 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
3221 | if (err < 0) | |
3222 | goto err; | |
3223 | ||
3224 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
3225 | ||
3226 | err: | |
3227 | kfree_skb(skb2); | |
3228 | return err; | |
3229 | } | |
3230 | ||
c50b960c PM |
3231 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
3232 | struct nft_set_desc *desc, | |
3233 | const struct nlattr *nla) | |
3234 | { | |
3235 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
3236 | int err; | |
3237 | ||
fceb6435 JB |
3238 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, |
3239 | nft_set_desc_policy, NULL); | |
c50b960c PM |
3240 | if (err < 0) |
3241 | return err; | |
3242 | ||
3243 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
3244 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
3245 | ||
3246 | return 0; | |
3247 | } | |
3248 | ||
633c9a84 PNA |
3249 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
3250 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3251 | const struct nlattr * const nla[], |
3252 | struct netlink_ext_ack *extack) | |
20a69341 PM |
3253 | { |
3254 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 3255 | u8 genmask = nft_genmask_next(net); |
98319cb9 | 3256 | int family = nfmsg->nfgen_family; |
20a69341 | 3257 | const struct nft_set_ops *ops; |
20a69341 PM |
3258 | struct nft_table *table; |
3259 | struct nft_set *set; | |
3260 | struct nft_ctx ctx; | |
38745490 | 3261 | char *name; |
20a69341 PM |
3262 | unsigned int size; |
3263 | bool create; | |
761da293 | 3264 | u64 timeout; |
8aeff920 | 3265 | u32 ktype, dtype, flags, policy, gc_int, objtype; |
c50b960c | 3266 | struct nft_set_desc desc; |
e6d8ecac CFG |
3267 | unsigned char *udata; |
3268 | u16 udlen; | |
20a69341 PM |
3269 | int err; |
3270 | ||
3271 | if (nla[NFTA_SET_TABLE] == NULL || | |
3272 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
3273 | nla[NFTA_SET_KEY_LEN] == NULL || |
3274 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
3275 | return -EINVAL; |
3276 | ||
c50b960c PM |
3277 | memset(&desc, 0, sizeof(desc)); |
3278 | ||
20a69341 PM |
3279 | ktype = NFT_DATA_VALUE; |
3280 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
3281 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
3282 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
3283 | return -EINVAL; | |
3284 | } | |
3285 | ||
c50b960c | 3286 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 3287 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3288 | return -EINVAL; |
3289 | ||
3290 | flags = 0; | |
3291 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
3292 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
3293 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 | 3294 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
8aeff920 PNA |
3295 | NFT_SET_MAP | NFT_SET_EVAL | |
3296 | NFT_SET_OBJECT)) | |
20a69341 | 3297 | return -EINVAL; |
8aeff920 PNA |
3298 | /* Only one of these operations is supported */ |
3299 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) == | |
3300 | (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) | |
7c6c6e95 | 3301 | return -EOPNOTSUPP; |
20a69341 PM |
3302 | } |
3303 | ||
3304 | dtype = 0; | |
20a69341 PM |
3305 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
3306 | if (!(flags & NFT_SET_MAP)) | |
3307 | return -EINVAL; | |
3308 | ||
3309 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
3310 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
3311 | dtype != NFT_DATA_VERDICT) | |
3312 | return -EINVAL; | |
3313 | ||
3314 | if (dtype != NFT_DATA_VERDICT) { | |
3315 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
3316 | return -EINVAL; | |
c50b960c | 3317 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 3318 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3319 | return -EINVAL; |
3320 | } else | |
7d740264 | 3321 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
3322 | } else if (flags & NFT_SET_MAP) |
3323 | return -EINVAL; | |
3324 | ||
8aeff920 PNA |
3325 | if (nla[NFTA_SET_OBJ_TYPE] != NULL) { |
3326 | if (!(flags & NFT_SET_OBJECT)) | |
3327 | return -EINVAL; | |
3328 | ||
3329 | objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); | |
3330 | if (objtype == NFT_OBJECT_UNSPEC || | |
3331 | objtype > NFT_OBJECT_MAX) | |
3332 | return -EINVAL; | |
3333 | } else if (flags & NFT_SET_OBJECT) | |
3334 | return -EINVAL; | |
3335 | else | |
3336 | objtype = NFT_OBJECT_UNSPEC; | |
3337 | ||
761da293 PM |
3338 | timeout = 0; |
3339 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
3340 | if (!(flags & NFT_SET_TIMEOUT)) | |
3341 | return -EINVAL; | |
8e1102d5 FW |
3342 | |
3343 | err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout); | |
3344 | if (err) | |
3345 | return err; | |
761da293 PM |
3346 | } |
3347 | gc_int = 0; | |
3348 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
3349 | if (!(flags & NFT_SET_TIMEOUT)) | |
3350 | return -EINVAL; | |
3351 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
3352 | } | |
3353 | ||
c50b960c PM |
3354 | policy = NFT_SET_POL_PERFORMANCE; |
3355 | if (nla[NFTA_SET_POLICY] != NULL) | |
3356 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
3357 | ||
3358 | if (nla[NFTA_SET_DESC] != NULL) { | |
3359 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
3360 | if (err < 0) | |
3361 | return err; | |
3362 | } | |
3363 | ||
20a69341 PM |
3364 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
3365 | ||
cac20fcd | 3366 | table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask); |
36dd1bcc PNA |
3367 | if (IS_ERR(table)) { |
3368 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); | |
20a69341 | 3369 | return PTR_ERR(table); |
36dd1bcc | 3370 | } |
20a69341 | 3371 | |
98319cb9 | 3372 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 | 3373 | |
cac20fcd | 3374 | set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask); |
20a69341 | 3375 | if (IS_ERR(set)) { |
36dd1bcc PNA |
3376 | if (PTR_ERR(set) != -ENOENT) { |
3377 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); | |
20a69341 | 3378 | return PTR_ERR(set); |
36dd1bcc | 3379 | } |
1a28ad74 | 3380 | } else { |
36dd1bcc PNA |
3381 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
3382 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); | |
20a69341 | 3383 | return -EEXIST; |
36dd1bcc | 3384 | } |
20a69341 PM |
3385 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
3386 | return -EOPNOTSUPP; | |
36dd1bcc | 3387 | |
20a69341 PM |
3388 | return 0; |
3389 | } | |
3390 | ||
3391 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
3392 | return -ENOENT; | |
3393 | ||
2b664957 | 3394 | ops = nft_select_set_ops(&ctx, nla, &desc, policy); |
20a69341 PM |
3395 | if (IS_ERR(ops)) |
3396 | return PTR_ERR(ops); | |
3397 | ||
e6d8ecac CFG |
3398 | udlen = 0; |
3399 | if (nla[NFTA_SET_USERDATA]) | |
3400 | udlen = nla_len(nla[NFTA_SET_USERDATA]); | |
3401 | ||
20a69341 PM |
3402 | size = 0; |
3403 | if (ops->privsize != NULL) | |
347b408d | 3404 | size = ops->privsize(nla, &desc); |
20a69341 | 3405 | |
1ff75a3e PNA |
3406 | set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); |
3407 | if (!set) { | |
3408 | err = -ENOMEM; | |
20a69341 | 3409 | goto err1; |
1ff75a3e | 3410 | } |
20a69341 | 3411 | |
38745490 PS |
3412 | name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL); |
3413 | if (!name) { | |
3414 | err = -ENOMEM; | |
3415 | goto err2; | |
3416 | } | |
3417 | ||
20a69341 | 3418 | err = nf_tables_set_alloc_name(&ctx, set, name); |
38745490 | 3419 | kfree(name); |
20a69341 PM |
3420 | if (err < 0) |
3421 | goto err2; | |
3422 | ||
e6d8ecac CFG |
3423 | udata = NULL; |
3424 | if (udlen) { | |
3425 | udata = set->data + size; | |
3426 | nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); | |
3427 | } | |
3428 | ||
20a69341 | 3429 | INIT_LIST_HEAD(&set->bindings); |
3453c927 PNA |
3430 | set->table = table; |
3431 | write_pnet(&set->net, net); | |
20a69341 PM |
3432 | set->ops = ops; |
3433 | set->ktype = ktype; | |
c50b960c | 3434 | set->klen = desc.klen; |
20a69341 | 3435 | set->dtype = dtype; |
8aeff920 | 3436 | set->objtype = objtype; |
c50b960c | 3437 | set->dlen = desc.dlen; |
20a69341 | 3438 | set->flags = flags; |
c50b960c | 3439 | set->size = desc.size; |
9363dc4b | 3440 | set->policy = policy; |
e6d8ecac CFG |
3441 | set->udlen = udlen; |
3442 | set->udata = udata; | |
761da293 PM |
3443 | set->timeout = timeout; |
3444 | set->gc_int = gc_int; | |
3ecbfd65 | 3445 | set->handle = nf_tables_alloc_handle(table); |
20a69341 | 3446 | |
c50b960c | 3447 | err = ops->init(set, &desc, nla); |
20a69341 | 3448 | if (err < 0) |
2f6adf48 | 3449 | goto err3; |
20a69341 | 3450 | |
958bee14 | 3451 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 | 3452 | if (err < 0) |
2f6adf48 | 3453 | goto err4; |
20a69341 | 3454 | |
e688a7f8 | 3455 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 3456 | table->use++; |
20a69341 PM |
3457 | return 0; |
3458 | ||
2f6adf48 | 3459 | err4: |
c17c3cdf | 3460 | ops->destroy(set); |
2f6adf48 FW |
3461 | err3: |
3462 | kfree(set->name); | |
20a69341 | 3463 | err2: |
1ff75a3e | 3464 | kvfree(set); |
20a69341 | 3465 | err1: |
71cc0873 | 3466 | module_put(to_set_type(ops)->owner); |
20a69341 PM |
3467 | return err; |
3468 | } | |
3469 | ||
958bee14 | 3470 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 3471 | { |
20a69341 | 3472 | set->ops->destroy(set); |
71cc0873 | 3473 | module_put(to_set_type(set->ops)->owner); |
38745490 | 3474 | kfree(set->name); |
1ff75a3e | 3475 | kvfree(set); |
20a69341 PM |
3476 | } |
3477 | ||
958bee14 PNA |
3478 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
3479 | { | |
e688a7f8 | 3480 | list_del_rcu(&set->list); |
31f8441c | 3481 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
3482 | nft_set_destroy(set); |
3483 | } | |
3484 | ||
633c9a84 PNA |
3485 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
3486 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3487 | const struct nlattr * const nla[], |
3488 | struct netlink_ext_ack *extack) | |
20a69341 | 3489 | { |
c9c8e485 | 3490 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
f2a6d766 | 3491 | u8 genmask = nft_genmask_next(net); |
36dd1bcc | 3492 | const struct nlattr *attr; |
20a69341 PM |
3493 | struct nft_set *set; |
3494 | struct nft_ctx ctx; | |
3495 | int err; | |
3496 | ||
ec2c9935 PM |
3497 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
3498 | return -EAFNOSUPPORT; | |
20a69341 PM |
3499 | if (nla[NFTA_SET_TABLE] == NULL) |
3500 | return -EINVAL; | |
3501 | ||
36dd1bcc PNA |
3502 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack, |
3503 | genmask); | |
20a69341 PM |
3504 | if (err < 0) |
3505 | return err; | |
3506 | ||
36dd1bcc PNA |
3507 | if (nla[NFTA_SET_HANDLE]) { |
3508 | attr = nla[NFTA_SET_HANDLE]; | |
3509 | set = nft_set_lookup_byhandle(ctx.table, attr, genmask); | |
3510 | } else { | |
3511 | attr = nla[NFTA_SET_NAME]; | |
3512 | set = nft_set_lookup(ctx.table, attr, genmask); | |
3513 | } | |
a8278400 | 3514 | |
36dd1bcc PNA |
3515 | if (IS_ERR(set)) { |
3516 | NL_SET_BAD_ATTR(extack, attr); | |
3517 | return PTR_ERR(set); | |
3518 | } | |
a8278400 | 3519 | if (!list_empty(&set->bindings) || |
36dd1bcc PNA |
3520 | (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) { |
3521 | NL_SET_BAD_ATTR(extack, attr); | |
20a69341 | 3522 | return -EBUSY; |
36dd1bcc | 3523 | } |
20a69341 | 3524 | |
ee01d542 | 3525 | return nft_delset(&ctx, set); |
20a69341 PM |
3526 | } |
3527 | ||
3528 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 3529 | struct nft_set *set, |
20a69341 | 3530 | const struct nft_set_iter *iter, |
de70185d | 3531 | struct nft_set_elem *elem) |
20a69341 | 3532 | { |
fe2811eb | 3533 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3534 | enum nft_registers dreg; |
3535 | ||
3536 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
3537 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
3538 | set->dtype == NFT_DATA_VERDICT ? | |
3539 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
3540 | set->dlen); | |
20a69341 PM |
3541 | } |
3542 | ||
3543 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3544 | struct nft_set_binding *binding) | |
3545 | { | |
3546 | struct nft_set_binding *i; | |
3547 | struct nft_set_iter iter; | |
3548 | ||
408070d6 | 3549 | if (!list_empty(&set->bindings) && nft_set_is_anonymous(set)) |
20a69341 PM |
3550 | return -EBUSY; |
3551 | ||
11113e19 | 3552 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
3553 | /* If the set is already bound to the same chain all |
3554 | * jumps are already validated for that chain. | |
3555 | */ | |
3556 | list_for_each_entry(i, &set->bindings, list) { | |
a4684402 | 3557 | if (i->flags & NFT_SET_MAP && |
11113e19 | 3558 | i->chain == binding->chain) |
20a69341 PM |
3559 | goto bind; |
3560 | } | |
3561 | ||
8588ac09 | 3562 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
3563 | iter.skip = 0; |
3564 | iter.count = 0; | |
3565 | iter.err = 0; | |
3566 | iter.fn = nf_tables_bind_check_setelem; | |
3567 | ||
3568 | set->ops->walk(ctx, set, &iter); | |
a02f4248 | 3569 | if (iter.err < 0) |
20a69341 | 3570 | return iter.err; |
20a69341 PM |
3571 | } |
3572 | bind: | |
3573 | binding->chain = ctx->chain; | |
e688a7f8 | 3574 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
3575 | return 0; |
3576 | } | |
63aea290 | 3577 | EXPORT_SYMBOL_GPL(nf_tables_bind_set); |
20a69341 PM |
3578 | |
3579 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3580 | struct nft_set_binding *binding) | |
3581 | { | |
e688a7f8 | 3582 | list_del_rcu(&binding->list); |
20a69341 | 3583 | |
408070d6 | 3584 | if (list_empty(&set->bindings) && nft_set_is_anonymous(set) && |
37a9cc52 | 3585 | nft_is_active(ctx->net, set)) |
20a69341 PM |
3586 | nf_tables_set_destroy(ctx, set); |
3587 | } | |
63aea290 | 3588 | EXPORT_SYMBOL_GPL(nf_tables_unbind_set); |
20a69341 | 3589 | |
3ac4c07a PM |
3590 | const struct nft_set_ext_type nft_set_ext_types[] = { |
3591 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 3592 | .align = __alignof__(u32), |
3ac4c07a PM |
3593 | }, |
3594 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 3595 | .align = __alignof__(u32), |
3ac4c07a | 3596 | }, |
f25ad2e9 PM |
3597 | [NFT_SET_EXT_EXPR] = { |
3598 | .align = __alignof__(struct nft_expr), | |
3599 | }, | |
8aeff920 PNA |
3600 | [NFT_SET_EXT_OBJREF] = { |
3601 | .len = sizeof(struct nft_object *), | |
3602 | .align = __alignof__(struct nft_object *), | |
3603 | }, | |
3ac4c07a PM |
3604 | [NFT_SET_EXT_FLAGS] = { |
3605 | .len = sizeof(u8), | |
3606 | .align = __alignof__(u8), | |
3607 | }, | |
c3e1b005 PM |
3608 | [NFT_SET_EXT_TIMEOUT] = { |
3609 | .len = sizeof(u64), | |
3610 | .align = __alignof__(u64), | |
3611 | }, | |
3612 | [NFT_SET_EXT_EXPIRATION] = { | |
8e1102d5 FW |
3613 | .len = sizeof(u64), |
3614 | .align = __alignof__(u64), | |
c3e1b005 | 3615 | }, |
68e942e8 PM |
3616 | [NFT_SET_EXT_USERDATA] = { |
3617 | .len = sizeof(struct nft_userdata), | |
3618 | .align = __alignof__(struct nft_userdata), | |
3619 | }, | |
3ac4c07a PM |
3620 | }; |
3621 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
3622 | ||
20a69341 PM |
3623 | /* |
3624 | * Set elements | |
3625 | */ | |
3626 | ||
3627 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
3628 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
3629 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
3630 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 3631 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
3632 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
3633 | .len = NFT_USERDATA_MAXLEN }, | |
467697d2 FW |
3634 | [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED }, |
3635 | [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING }, | |
20a69341 PM |
3636 | }; |
3637 | ||
3638 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
b2fbd044 LZ |
3639 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, |
3640 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
3641 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, | |
3642 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
20a69341 | 3643 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
958bee14 | 3644 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
3645 | }; |
3646 | ||
633c9a84 | 3647 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
3648 | const struct sk_buff *skb, |
3649 | const struct nlmsghdr *nlh, | |
f2a6d766 | 3650 | const struct nlattr * const nla[], |
36dd1bcc | 3651 | struct netlink_ext_ack *extack, |
f2a6d766 | 3652 | u8 genmask) |
20a69341 PM |
3653 | { |
3654 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
98319cb9 | 3655 | int family = nfmsg->nfgen_family; |
7c95f6d8 | 3656 | struct nft_table *table; |
20a69341 | 3657 | |
cac20fcd PNA |
3658 | table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, |
3659 | genmask); | |
36dd1bcc PNA |
3660 | if (IS_ERR(table)) { |
3661 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); | |
20a69341 | 3662 | return PTR_ERR(table); |
36dd1bcc | 3663 | } |
20a69341 | 3664 | |
98319cb9 | 3665 | nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 PM |
3666 | return 0; |
3667 | } | |
3668 | ||
3669 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
3670 | const struct nft_set *set, | |
3671 | const struct nft_set_elem *elem) | |
3672 | { | |
fe2811eb | 3673 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3674 | unsigned char *b = skb_tail_pointer(skb); |
3675 | struct nlattr *nest; | |
3676 | ||
3677 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
3678 | if (nest == NULL) | |
3679 | goto nla_put_failure; | |
3680 | ||
fe2811eb PM |
3681 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
3682 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
3683 | goto nla_put_failure; |
3684 | ||
fe2811eb PM |
3685 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3686 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
3687 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
3688 | set->dlen) < 0) | |
3689 | goto nla_put_failure; | |
3690 | ||
f25ad2e9 PM |
3691 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3692 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3693 | goto nla_put_failure; | |
3694 | ||
8aeff920 PNA |
3695 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && |
3696 | nla_put_string(skb, NFTA_SET_ELEM_OBJREF, | |
3697 | (*nft_set_ext_obj(ext))->name) < 0) | |
3698 | goto nla_put_failure; | |
3699 | ||
fe2811eb PM |
3700 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3701 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3702 | htonl(*nft_set_ext_flags(ext)))) | |
3703 | goto nla_put_failure; | |
20a69341 | 3704 | |
c3e1b005 PM |
3705 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3706 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
8e1102d5 | 3707 | nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)), |
b46f6ded | 3708 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3709 | goto nla_put_failure; |
3710 | ||
3711 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
8e1102d5 | 3712 | u64 expires, now = get_jiffies_64(); |
c3e1b005 PM |
3713 | |
3714 | expires = *nft_set_ext_expiration(ext); | |
8e1102d5 | 3715 | if (time_before64(now, expires)) |
c3e1b005 PM |
3716 | expires -= now; |
3717 | else | |
3718 | expires = 0; | |
3719 | ||
3720 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
8e1102d5 | 3721 | nf_jiffies64_to_msecs(expires), |
b46f6ded | 3722 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3723 | goto nla_put_failure; |
3724 | } | |
3725 | ||
68e942e8 PM |
3726 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3727 | struct nft_userdata *udata; | |
3728 | ||
3729 | udata = nft_set_ext_userdata(ext); | |
3730 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3731 | udata->len + 1, udata->data)) | |
3732 | goto nla_put_failure; | |
3733 | } | |
3734 | ||
20a69341 PM |
3735 | nla_nest_end(skb, nest); |
3736 | return 0; | |
3737 | ||
3738 | nla_put_failure: | |
3739 | nlmsg_trim(skb, b); | |
3740 | return -EMSGSIZE; | |
3741 | } | |
3742 | ||
3743 | struct nft_set_dump_args { | |
3744 | const struct netlink_callback *cb; | |
3745 | struct nft_set_iter iter; | |
3746 | struct sk_buff *skb; | |
3747 | }; | |
3748 | ||
3749 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
de70185d | 3750 | struct nft_set *set, |
20a69341 | 3751 | const struct nft_set_iter *iter, |
de70185d | 3752 | struct nft_set_elem *elem) |
20a69341 PM |
3753 | { |
3754 | struct nft_set_dump_args *args; | |
3755 | ||
3756 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3757 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3758 | } | |
3759 | ||
fa803605 LZ |
3760 | struct nft_set_dump_ctx { |
3761 | const struct nft_set *set; | |
3762 | struct nft_ctx ctx; | |
3763 | }; | |
3764 | ||
20a69341 PM |
3765 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
3766 | { | |
fa803605 | 3767 | struct nft_set_dump_ctx *dump_ctx = cb->data; |
633c9a84 | 3768 | struct net *net = sock_net(skb->sk); |
fa803605 | 3769 | struct nft_table *table; |
de70185d | 3770 | struct nft_set *set; |
20a69341 | 3771 | struct nft_set_dump_args args; |
fa803605 | 3772 | bool set_found = false; |
20a69341 PM |
3773 | struct nfgenmsg *nfmsg; |
3774 | struct nlmsghdr *nlh; | |
3775 | struct nlattr *nest; | |
3776 | u32 portid, seq; | |
fa803605 | 3777 | int event; |
20a69341 | 3778 | |
fa803605 | 3779 | rcu_read_lock(); |
36596dad PNA |
3780 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
3781 | if (dump_ctx->ctx.family != NFPROTO_UNSPEC && | |
98319cb9 | 3782 | dump_ctx->ctx.family != table->family) |
fa803605 | 3783 | continue; |
20a69341 | 3784 | |
36596dad PNA |
3785 | if (table != dump_ctx->ctx.table) |
3786 | continue; | |
20a69341 | 3787 | |
36596dad PNA |
3788 | list_for_each_entry_rcu(set, &table->sets, list) { |
3789 | if (set == dump_ctx->set) { | |
3790 | set_found = true; | |
3791 | break; | |
fa803605 | 3792 | } |
fa803605 LZ |
3793 | } |
3794 | break; | |
3795 | } | |
3796 | ||
3797 | if (!set_found) { | |
3798 | rcu_read_unlock(); | |
3799 | return -ENOENT; | |
3800 | } | |
20a69341 | 3801 | |
dedb67c4 | 3802 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); |
20a69341 PM |
3803 | portid = NETLINK_CB(cb->skb).portid; |
3804 | seq = cb->nlh->nlmsg_seq; | |
3805 | ||
3806 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3807 | NLM_F_MULTI); | |
3808 | if (nlh == NULL) | |
3809 | goto nla_put_failure; | |
3810 | ||
3811 | nfmsg = nlmsg_data(nlh); | |
98319cb9 | 3812 | nfmsg->nfgen_family = table->family; |
20a69341 | 3813 | nfmsg->version = NFNETLINK_V0; |
fa803605 | 3814 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
20a69341 | 3815 | |
fa803605 | 3816 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) |
20a69341 PM |
3817 | goto nla_put_failure; |
3818 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3819 | goto nla_put_failure; | |
3820 | ||
3821 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3822 | if (nest == NULL) | |
3823 | goto nla_put_failure; | |
3824 | ||
8588ac09 PNA |
3825 | args.cb = cb; |
3826 | args.skb = skb; | |
fa803605 | 3827 | args.iter.genmask = nft_genmask_cur(net); |
8588ac09 PNA |
3828 | args.iter.skip = cb->args[0]; |
3829 | args.iter.count = 0; | |
3830 | args.iter.err = 0; | |
3831 | args.iter.fn = nf_tables_dump_setelem; | |
fa803605 LZ |
3832 | set->ops->walk(&dump_ctx->ctx, set, &args.iter); |
3833 | rcu_read_unlock(); | |
20a69341 PM |
3834 | |
3835 | nla_nest_end(skb, nest); | |
3836 | nlmsg_end(skb, nlh); | |
3837 | ||
3838 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3839 | return args.iter.err; | |
3840 | if (args.iter.count == cb->args[0]) | |
3841 | return 0; | |
3842 | ||
3843 | cb->args[0] = args.iter.count; | |
3844 | return skb->len; | |
3845 | ||
3846 | nla_put_failure: | |
fa803605 | 3847 | rcu_read_unlock(); |
20a69341 PM |
3848 | return -ENOSPC; |
3849 | } | |
3850 | ||
fa803605 LZ |
3851 | static int nf_tables_dump_set_done(struct netlink_callback *cb) |
3852 | { | |
3853 | kfree(cb->data); | |
3854 | return 0; | |
3855 | } | |
3856 | ||
d60ce62f AB |
3857 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
3858 | const struct nft_ctx *ctx, u32 seq, | |
3859 | u32 portid, int event, u16 flags, | |
3860 | const struct nft_set *set, | |
3861 | const struct nft_set_elem *elem) | |
3862 | { | |
3863 | struct nfgenmsg *nfmsg; | |
3864 | struct nlmsghdr *nlh; | |
3865 | struct nlattr *nest; | |
3866 | int err; | |
3867 | ||
dedb67c4 | 3868 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
d60ce62f AB |
3869 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
3870 | flags); | |
3871 | if (nlh == NULL) | |
3872 | goto nla_put_failure; | |
3873 | ||
3874 | nfmsg = nlmsg_data(nlh); | |
36596dad | 3875 | nfmsg->nfgen_family = ctx->family; |
d60ce62f | 3876 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 3877 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
3878 | |
3879 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3880 | goto nla_put_failure; | |
3881 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3882 | goto nla_put_failure; | |
3883 | ||
3884 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3885 | if (nest == NULL) | |
3886 | goto nla_put_failure; | |
3887 | ||
3888 | err = nf_tables_fill_setelem(skb, set, elem); | |
3889 | if (err < 0) | |
3890 | goto nla_put_failure; | |
3891 | ||
3892 | nla_nest_end(skb, nest); | |
3893 | ||
053c095a JB |
3894 | nlmsg_end(skb, nlh); |
3895 | return 0; | |
d60ce62f AB |
3896 | |
3897 | nla_put_failure: | |
3898 | nlmsg_trim(skb, nlh); | |
3899 | return -1; | |
3900 | } | |
3901 | ||
ba0e4d99 PNA |
3902 | static int nft_setelem_parse_flags(const struct nft_set *set, |
3903 | const struct nlattr *attr, u32 *flags) | |
3904 | { | |
3905 | if (attr == NULL) | |
3906 | return 0; | |
3907 | ||
3908 | *flags = ntohl(nla_get_be32(attr)); | |
3909 | if (*flags & ~NFT_SET_ELEM_INTERVAL_END) | |
3910 | return -EINVAL; | |
3911 | if (!(set->flags & NFT_SET_INTERVAL) && | |
3912 | *flags & NFT_SET_ELEM_INTERVAL_END) | |
3913 | return -EINVAL; | |
3914 | ||
3915 | return 0; | |
3916 | } | |
3917 | ||
3918 | static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set, | |
3919 | const struct nlattr *attr) | |
3920 | { | |
3921 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3922 | const struct nft_set_ext *ext; | |
3923 | struct nft_data_desc desc; | |
3924 | struct nft_set_elem elem; | |
3925 | struct sk_buff *skb; | |
3926 | uint32_t flags = 0; | |
3927 | void *priv; | |
3928 | int err; | |
3929 | ||
3930 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3931 | nft_set_elem_policy, NULL); | |
3932 | if (err < 0) | |
3933 | return err; | |
3934 | ||
3935 | if (!nla[NFTA_SET_ELEM_KEY]) | |
3936 | return -EINVAL; | |
3937 | ||
3938 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
3939 | if (err < 0) | |
3940 | return err; | |
3941 | ||
3942 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, | |
3943 | nla[NFTA_SET_ELEM_KEY]); | |
3944 | if (err < 0) | |
3945 | return err; | |
3946 | ||
3947 | err = -EINVAL; | |
3948 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
3949 | return err; | |
3950 | ||
3951 | priv = set->ops->get(ctx->net, set, &elem, flags); | |
3952 | if (IS_ERR(priv)) | |
3953 | return PTR_ERR(priv); | |
3954 | ||
3955 | elem.priv = priv; | |
3956 | ext = nft_set_elem_ext(set, &elem); | |
3957 | ||
3958 | err = -ENOMEM; | |
d9adf22a | 3959 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); |
ba0e4d99 PNA |
3960 | if (skb == NULL) |
3961 | goto err1; | |
3962 | ||
3963 | err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid, | |
3964 | NFT_MSG_NEWSETELEM, 0, set, &elem); | |
3965 | if (err < 0) | |
3966 | goto err2; | |
3967 | ||
3968 | err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT); | |
3969 | /* This avoids a loop in nfnetlink. */ | |
3970 | if (err < 0) | |
3971 | goto err1; | |
3972 | ||
3973 | return 0; | |
3974 | err2: | |
3975 | kfree_skb(skb); | |
3976 | err1: | |
3977 | /* this avoids a loop in nfnetlink. */ | |
3978 | return err == -EAGAIN ? -ENOBUFS : err; | |
3979 | } | |
3980 | ||
d9adf22a | 3981 | /* called with rcu_read_lock held */ |
ba0e4d99 PNA |
3982 | static int nf_tables_getsetelem(struct net *net, struct sock *nlsk, |
3983 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
3984 | const struct nlattr * const nla[], | |
3985 | struct netlink_ext_ack *extack) | |
3986 | { | |
3987 | u8 genmask = nft_genmask_cur(net); | |
3988 | struct nft_set *set; | |
3989 | struct nlattr *attr; | |
3990 | struct nft_ctx ctx; | |
3991 | int rem, err = 0; | |
3992 | ||
36dd1bcc PNA |
3993 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack, |
3994 | genmask); | |
ba0e4d99 PNA |
3995 | if (err < 0) |
3996 | return err; | |
3997 | ||
cac20fcd | 3998 | set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask); |
ba0e4d99 PNA |
3999 | if (IS_ERR(set)) |
4000 | return PTR_ERR(set); | |
4001 | ||
4002 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
4003 | struct netlink_dump_control c = { | |
4004 | .dump = nf_tables_dump_set, | |
4005 | .done = nf_tables_dump_set_done, | |
d9adf22a | 4006 | .module = THIS_MODULE, |
ba0e4d99 PNA |
4007 | }; |
4008 | struct nft_set_dump_ctx *dump_ctx; | |
4009 | ||
d9adf22a | 4010 | dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_ATOMIC); |
ba0e4d99 PNA |
4011 | if (!dump_ctx) |
4012 | return -ENOMEM; | |
4013 | ||
4014 | dump_ctx->set = set; | |
4015 | dump_ctx->ctx = ctx; | |
4016 | ||
4017 | c.data = dump_ctx; | |
d9adf22a | 4018 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
ba0e4d99 PNA |
4019 | } |
4020 | ||
4021 | if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) | |
4022 | return -EINVAL; | |
4023 | ||
4024 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
4025 | err = nft_get_set_elem(&ctx, set, attr); | |
4026 | if (err < 0) | |
4027 | break; | |
4028 | } | |
4029 | ||
4030 | return err; | |
4031 | } | |
4032 | ||
25e94a99 PNA |
4033 | static void nf_tables_setelem_notify(const struct nft_ctx *ctx, |
4034 | const struct nft_set *set, | |
4035 | const struct nft_set_elem *elem, | |
4036 | int event, u16 flags) | |
d60ce62f | 4037 | { |
128ad332 PNA |
4038 | struct net *net = ctx->net; |
4039 | u32 portid = ctx->portid; | |
d60ce62f AB |
4040 | struct sk_buff *skb; |
4041 | int err; | |
4042 | ||
128ad332 | 4043 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
25e94a99 | 4044 | return; |
d60ce62f | 4045 | |
d60ce62f AB |
4046 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
4047 | if (skb == NULL) | |
4048 | goto err; | |
4049 | ||
4050 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
4051 | set, elem); | |
4052 | if (err < 0) { | |
4053 | kfree_skb(skb); | |
4054 | goto err; | |
4055 | } | |
4056 | ||
25e94a99 PNA |
4057 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
4058 | GFP_KERNEL); | |
4059 | return; | |
d60ce62f | 4060 | err: |
25e94a99 | 4061 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
d60ce62f AB |
4062 | } |
4063 | ||
60319eb1 PNA |
4064 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
4065 | int msg_type, | |
4066 | struct nft_set *set) | |
4067 | { | |
4068 | struct nft_trans *trans; | |
4069 | ||
4070 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
4071 | if (trans == NULL) | |
4072 | return NULL; | |
4073 | ||
4074 | nft_trans_elem_set(trans) = set; | |
4075 | return trans; | |
4076 | } | |
4077 | ||
22fe54d5 PM |
4078 | void *nft_set_elem_init(const struct nft_set *set, |
4079 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 4080 | const u32 *key, const u32 *data, |
22fe54d5 | 4081 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
4082 | { |
4083 | struct nft_set_ext *ext; | |
4084 | void *elem; | |
4085 | ||
4086 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
4087 | if (elem == NULL) | |
4088 | return NULL; | |
4089 | ||
4090 | ext = nft_set_elem_ext(set, elem); | |
4091 | nft_set_ext_init(ext, tmpl); | |
4092 | ||
4093 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
4094 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4095 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
4096 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
4097 | *nft_set_ext_expiration(ext) = | |
8e1102d5 | 4098 | get_jiffies_64() + timeout; |
c3e1b005 PM |
4099 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) |
4100 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
4101 | |
4102 | return elem; | |
4103 | } | |
4104 | ||
61f9e292 LZ |
4105 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
4106 | bool destroy_expr) | |
61edafbb PM |
4107 | { |
4108 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3453c927 PNA |
4109 | struct nft_ctx ctx = { |
4110 | .net = read_pnet(&set->net), | |
4111 | .family = set->table->family, | |
4112 | }; | |
61edafbb | 4113 | |
59105446 | 4114 | nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); |
61edafbb | 4115 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) |
59105446 | 4116 | nft_data_release(nft_set_ext_data(ext), set->dtype); |
371ebcbb PNA |
4117 | if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) { |
4118 | struct nft_expr *expr = nft_set_ext_expr(ext); | |
4119 | ||
4120 | if (expr->ops->destroy_clone) { | |
4121 | expr->ops->destroy_clone(&ctx, expr); | |
4122 | module_put(expr->ops->type->owner); | |
4123 | } else { | |
4124 | nf_tables_expr_destroy(&ctx, expr); | |
4125 | } | |
4126 | } | |
8aeff920 PNA |
4127 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) |
4128 | (*nft_set_ext_obj(ext))->use--; | |
61edafbb PM |
4129 | kfree(elem); |
4130 | } | |
4131 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
4132 | ||
59105446 PNA |
4133 | /* Only called from commit path, nft_set_elem_deactivate() already deals with |
4134 | * the refcounting from the preparation phase. | |
4135 | */ | |
3453c927 PNA |
4136 | static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, |
4137 | const struct nft_set *set, void *elem) | |
59105446 PNA |
4138 | { |
4139 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
4140 | ||
4141 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) | |
3453c927 | 4142 | nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext)); |
59105446 PNA |
4143 | kfree(elem); |
4144 | } | |
4145 | ||
60319eb1 | 4146 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
c016c7e4 | 4147 | const struct nlattr *attr, u32 nlmsg_flags) |
20a69341 PM |
4148 | { |
4149 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
8aeff920 | 4150 | u8 genmask = nft_genmask_next(ctx->net); |
20a69341 | 4151 | struct nft_data_desc d1, d2; |
fe2811eb | 4152 | struct nft_set_ext_tmpl tmpl; |
c016c7e4 | 4153 | struct nft_set_ext *ext, *ext2; |
20a69341 PM |
4154 | struct nft_set_elem elem; |
4155 | struct nft_set_binding *binding; | |
8aeff920 | 4156 | struct nft_object *obj = NULL; |
68e942e8 | 4157 | struct nft_userdata *udata; |
fe2811eb | 4158 | struct nft_data data; |
20a69341 | 4159 | enum nft_registers dreg; |
60319eb1 | 4160 | struct nft_trans *trans; |
0e9091d6 | 4161 | u32 flags = 0; |
c3e1b005 | 4162 | u64 timeout; |
68e942e8 | 4163 | u8 ulen; |
20a69341 PM |
4164 | int err; |
4165 | ||
4166 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 4167 | nft_set_elem_policy, NULL); |
20a69341 PM |
4168 | if (err < 0) |
4169 | return err; | |
4170 | ||
4171 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
4172 | return -EINVAL; | |
4173 | ||
fe2811eb PM |
4174 | nft_set_ext_prepare(&tmpl); |
4175 | ||
0e9091d6 PNA |
4176 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); |
4177 | if (err < 0) | |
4178 | return err; | |
4179 | if (flags != 0) | |
4180 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
4181 | |
4182 | if (set->flags & NFT_SET_MAP) { | |
4183 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 4184 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 4185 | return -EINVAL; |
bd7fc645 | 4186 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 4187 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 4188 | return -EINVAL; |
20a69341 PM |
4189 | } else { |
4190 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
4191 | return -EINVAL; | |
4192 | } | |
4193 | ||
c3e1b005 PM |
4194 | timeout = 0; |
4195 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
4196 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
4197 | return -EINVAL; | |
8e1102d5 FW |
4198 | err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT], |
4199 | &timeout); | |
4200 | if (err) | |
4201 | return err; | |
c3e1b005 PM |
4202 | } else if (set->flags & NFT_SET_TIMEOUT) { |
4203 | timeout = set->timeout; | |
4204 | } | |
4205 | ||
7d740264 | 4206 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 4207 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
4208 | if (err < 0) |
4209 | goto err1; | |
4210 | err = -EINVAL; | |
4211 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
4212 | goto err2; | |
4213 | ||
7d740264 | 4214 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
4215 | if (timeout > 0) { |
4216 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
4217 | if (timeout != set->timeout) | |
4218 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
4219 | } | |
fe2811eb | 4220 | |
8aeff920 PNA |
4221 | if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { |
4222 | if (!(set->flags & NFT_SET_OBJECT)) { | |
4223 | err = -EINVAL; | |
4224 | goto err2; | |
4225 | } | |
cac20fcd PNA |
4226 | obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF], |
4227 | set->objtype, genmask); | |
8aeff920 PNA |
4228 | if (IS_ERR(obj)) { |
4229 | err = PTR_ERR(obj); | |
4230 | goto err2; | |
4231 | } | |
4232 | nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); | |
4233 | } | |
4234 | ||
20a69341 | 4235 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
4236 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
4237 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
4238 | if (err < 0) |
4239 | goto err2; | |
4240 | ||
4241 | err = -EINVAL; | |
4242 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
4243 | goto err3; | |
4244 | ||
4245 | dreg = nft_type_to_reg(set->dtype); | |
4246 | list_for_each_entry(binding, &set->bindings, list) { | |
4247 | struct nft_ctx bind_ctx = { | |
58c78e10 | 4248 | .net = ctx->net, |
36596dad | 4249 | .family = ctx->family, |
20a69341 | 4250 | .table = ctx->table, |
7c95f6d8 | 4251 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
4252 | }; |
4253 | ||
11113e19 PM |
4254 | if (!(binding->flags & NFT_SET_MAP)) |
4255 | continue; | |
4256 | ||
1ec10212 PM |
4257 | err = nft_validate_register_store(&bind_ctx, dreg, |
4258 | &data, | |
4259 | d2.type, d2.len); | |
20a69341 PM |
4260 | if (err < 0) |
4261 | goto err3; | |
a654de8f PNA |
4262 | |
4263 | if (d2.type == NFT_DATA_VERDICT && | |
4264 | (data.verdict.code == NFT_GOTO || | |
4265 | data.verdict.code == NFT_JUMP)) | |
4266 | nft_validate_state_update(ctx->net, | |
4267 | NFT_VALIDATE_NEED); | |
20a69341 | 4268 | } |
fe2811eb | 4269 | |
7d740264 | 4270 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
4271 | } |
4272 | ||
68e942e8 PM |
4273 | /* The full maximum length of userdata can exceed the maximum |
4274 | * offset value (U8_MAX) for following extensions, therefor it | |
4275 | * must be the last extension added. | |
4276 | */ | |
4277 | ulen = 0; | |
4278 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
4279 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
4280 | if (ulen > 0) | |
4281 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
4282 | ulen); | |
4283 | } | |
4284 | ||
fe2811eb | 4285 | err = -ENOMEM; |
7d740264 | 4286 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 4287 | timeout, GFP_KERNEL); |
fe2811eb PM |
4288 | if (elem.priv == NULL) |
4289 | goto err3; | |
4290 | ||
4291 | ext = nft_set_elem_ext(set, elem.priv); | |
4292 | if (flags) | |
4293 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
4294 | if (ulen > 0) { |
4295 | udata = nft_set_ext_userdata(ext); | |
4296 | udata->len = ulen - 1; | |
4297 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
4298 | } | |
8aeff920 PNA |
4299 | if (obj) { |
4300 | *nft_set_ext_obj(ext) = obj; | |
4301 | obj->use++; | |
4302 | } | |
fe2811eb | 4303 | |
60319eb1 PNA |
4304 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
4305 | if (trans == NULL) | |
fe2811eb | 4306 | goto err4; |
60319eb1 | 4307 | |
69086658 | 4308 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
c016c7e4 PNA |
4309 | err = set->ops->insert(ctx->net, set, &elem, &ext2); |
4310 | if (err) { | |
4311 | if (err == -EEXIST) { | |
9744a6fc PNA |
4312 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ |
4313 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || | |
4314 | nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ | |
f0dfd7a2 CIK |
4315 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) { |
4316 | err = -EBUSY; | |
4317 | goto err5; | |
4318 | } | |
8aeff920 PNA |
4319 | if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
4320 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && | |
4321 | memcmp(nft_set_ext_data(ext), | |
4322 | nft_set_ext_data(ext2), set->dlen) != 0) || | |
4323 | (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && | |
4324 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && | |
4325 | *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) | |
c016c7e4 PNA |
4326 | err = -EBUSY; |
4327 | else if (!(nlmsg_flags & NLM_F_EXCL)) | |
4328 | err = 0; | |
4329 | } | |
fe2811eb | 4330 | goto err5; |
c016c7e4 | 4331 | } |
20a69341 | 4332 | |
35d0ac90 PNA |
4333 | if (set->size && |
4334 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { | |
4335 | err = -ENFILE; | |
4336 | goto err6; | |
4337 | } | |
4338 | ||
60319eb1 | 4339 | nft_trans_elem(trans) = elem; |
46bbafce | 4340 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
4341 | return 0; |
4342 | ||
35d0ac90 | 4343 | err6: |
5cb82a38 | 4344 | set->ops->remove(ctx->net, set, &elem); |
fe2811eb | 4345 | err5: |
60319eb1 | 4346 | kfree(trans); |
fe2811eb PM |
4347 | err4: |
4348 | kfree(elem.priv); | |
20a69341 PM |
4349 | err3: |
4350 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
59105446 | 4351 | nft_data_release(&data, d2.type); |
20a69341 | 4352 | err2: |
59105446 | 4353 | nft_data_release(&elem.key.val, d1.type); |
20a69341 PM |
4354 | err1: |
4355 | return err; | |
4356 | } | |
4357 | ||
633c9a84 PNA |
4358 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
4359 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4360 | const struct nlattr * const nla[], |
4361 | struct netlink_ext_ack *extack) | |
20a69341 | 4362 | { |
f2a6d766 | 4363 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4364 | const struct nlattr *attr; |
4365 | struct nft_set *set; | |
4366 | struct nft_ctx ctx; | |
a654de8f | 4367 | int rem, err; |
20a69341 | 4368 | |
7d5570ca PNA |
4369 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
4370 | return -EINVAL; | |
4371 | ||
36dd1bcc PNA |
4372 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack, |
4373 | genmask); | |
20a69341 PM |
4374 | if (err < 0) |
4375 | return err; | |
4376 | ||
a3073c17 PNA |
4377 | set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
4378 | nla[NFTA_SET_ELEM_LIST_SET_ID], genmask); | |
4379 | if (IS_ERR(set)) | |
4380 | return PTR_ERR(set); | |
958bee14 | 4381 | |
20a69341 PM |
4382 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
4383 | return -EBUSY; | |
4384 | ||
4385 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
c016c7e4 | 4386 | err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags); |
35d0ac90 | 4387 | if (err < 0) |
a654de8f | 4388 | return err; |
20a69341 | 4389 | } |
a654de8f PNA |
4390 | |
4391 | if (net->nft.validate_state == NFT_VALIDATE_DO) | |
4392 | return nft_table_validate(net, ctx.table); | |
4393 | ||
4394 | return 0; | |
20a69341 PM |
4395 | } |
4396 | ||
59105446 PNA |
4397 | /** |
4398 | * nft_data_hold - hold a nft_data item | |
4399 | * | |
4400 | * @data: struct nft_data to release | |
4401 | * @type: type of data | |
4402 | * | |
4403 | * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
4404 | * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and | |
4405 | * NFT_GOTO verdicts. This function must be called on active data objects | |
4406 | * from the second phase of the commit protocol. | |
4407 | */ | |
bb7b40ae | 4408 | void nft_data_hold(const struct nft_data *data, enum nft_data_types type) |
59105446 PNA |
4409 | { |
4410 | if (type == NFT_DATA_VERDICT) { | |
4411 | switch (data->verdict.code) { | |
4412 | case NFT_JUMP: | |
4413 | case NFT_GOTO: | |
4414 | data->verdict.chain->use++; | |
4415 | break; | |
4416 | } | |
4417 | } | |
4418 | } | |
4419 | ||
4420 | static void nft_set_elem_activate(const struct net *net, | |
4421 | const struct nft_set *set, | |
4422 | struct nft_set_elem *elem) | |
4423 | { | |
4424 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4425 | ||
4426 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4427 | nft_data_hold(nft_set_ext_data(ext), set->dtype); | |
4428 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4429 | (*nft_set_ext_obj(ext))->use++; | |
4430 | } | |
4431 | ||
4432 | static void nft_set_elem_deactivate(const struct net *net, | |
4433 | const struct nft_set *set, | |
4434 | struct nft_set_elem *elem) | |
4435 | { | |
4436 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4437 | ||
4438 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4439 | nft_data_release(nft_set_ext_data(ext), set->dtype); | |
4440 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4441 | (*nft_set_ext_obj(ext))->use--; | |
4442 | } | |
4443 | ||
60319eb1 | 4444 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
4445 | const struct nlattr *attr) |
4446 | { | |
4447 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3971ca14 | 4448 | struct nft_set_ext_tmpl tmpl; |
20a69341 PM |
4449 | struct nft_data_desc desc; |
4450 | struct nft_set_elem elem; | |
3971ca14 | 4451 | struct nft_set_ext *ext; |
60319eb1 | 4452 | struct nft_trans *trans; |
3971ca14 PNA |
4453 | u32 flags = 0; |
4454 | void *priv; | |
20a69341 PM |
4455 | int err; |
4456 | ||
4457 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 4458 | nft_set_elem_policy, NULL); |
20a69341 PM |
4459 | if (err < 0) |
4460 | goto err1; | |
4461 | ||
4462 | err = -EINVAL; | |
4463 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
4464 | goto err1; | |
4465 | ||
3971ca14 PNA |
4466 | nft_set_ext_prepare(&tmpl); |
4467 | ||
4468 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
4469 | if (err < 0) | |
4470 | return err; | |
4471 | if (flags != 0) | |
4472 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
4473 | ||
7d740264 | 4474 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 4475 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
4476 | if (err < 0) |
4477 | goto err1; | |
4478 | ||
4479 | err = -EINVAL; | |
4480 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
4481 | goto err2; | |
4482 | ||
3971ca14 PNA |
4483 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len); |
4484 | ||
4485 | err = -ENOMEM; | |
4486 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0, | |
4487 | GFP_KERNEL); | |
4488 | if (elem.priv == NULL) | |
4489 | goto err2; | |
4490 | ||
4491 | ext = nft_set_elem_ext(set, elem.priv); | |
4492 | if (flags) | |
4493 | *nft_set_ext_flags(ext) = flags; | |
4494 | ||
60319eb1 | 4495 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
4496 | if (trans == NULL) { |
4497 | err = -ENOMEM; | |
3971ca14 | 4498 | goto err3; |
609ccf08 | 4499 | } |
20a69341 | 4500 | |
42a55769 | 4501 | priv = set->ops->deactivate(ctx->net, set, &elem); |
3971ca14 | 4502 | if (priv == NULL) { |
cc02e457 | 4503 | err = -ENOENT; |
3971ca14 | 4504 | goto err4; |
cc02e457 | 4505 | } |
3971ca14 PNA |
4506 | kfree(elem.priv); |
4507 | elem.priv = priv; | |
cc02e457 | 4508 | |
59105446 PNA |
4509 | nft_set_elem_deactivate(ctx->net, set, &elem); |
4510 | ||
60319eb1 | 4511 | nft_trans_elem(trans) = elem; |
46bbafce | 4512 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 4513 | return 0; |
cc02e457 | 4514 | |
3971ca14 | 4515 | err4: |
cc02e457 | 4516 | kfree(trans); |
3971ca14 PNA |
4517 | err3: |
4518 | kfree(elem.priv); | |
20a69341 | 4519 | err2: |
59105446 | 4520 | nft_data_release(&elem.key.val, desc.type); |
20a69341 PM |
4521 | err1: |
4522 | return err; | |
4523 | } | |
4524 | ||
8411b644 | 4525 | static int nft_flush_set(const struct nft_ctx *ctx, |
de70185d | 4526 | struct nft_set *set, |
8411b644 | 4527 | const struct nft_set_iter *iter, |
de70185d | 4528 | struct nft_set_elem *elem) |
8411b644 PNA |
4529 | { |
4530 | struct nft_trans *trans; | |
4531 | int err; | |
4532 | ||
4533 | trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, | |
4534 | sizeof(struct nft_trans_elem), GFP_ATOMIC); | |
4535 | if (!trans) | |
4536 | return -ENOMEM; | |
4537 | ||
1ba1c414 | 4538 | if (!set->ops->flush(ctx->net, set, elem->priv)) { |
8411b644 PNA |
4539 | err = -ENOENT; |
4540 | goto err1; | |
4541 | } | |
b2c11e4b | 4542 | set->ndeact++; |
8411b644 | 4543 | |
de70185d PNA |
4544 | nft_trans_elem_set(trans) = set; |
4545 | nft_trans_elem(trans) = *elem; | |
8411b644 PNA |
4546 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
4547 | ||
4548 | return 0; | |
4549 | err1: | |
4550 | kfree(trans); | |
4551 | return err; | |
4552 | } | |
4553 | ||
633c9a84 PNA |
4554 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
4555 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4556 | const struct nlattr * const nla[], |
4557 | struct netlink_ext_ack *extack) | |
20a69341 | 4558 | { |
f2a6d766 | 4559 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4560 | const struct nlattr *attr; |
4561 | struct nft_set *set; | |
4562 | struct nft_ctx ctx; | |
60319eb1 | 4563 | int rem, err = 0; |
20a69341 | 4564 | |
36dd1bcc PNA |
4565 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack, |
4566 | genmask); | |
20a69341 PM |
4567 | if (err < 0) |
4568 | return err; | |
4569 | ||
cac20fcd | 4570 | set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask); |
20a69341 PM |
4571 | if (IS_ERR(set)) |
4572 | return PTR_ERR(set); | |
4573 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
4574 | return -EBUSY; | |
4575 | ||
8411b644 | 4576 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) { |
baa2d42c PNA |
4577 | struct nft_set_iter iter = { |
4578 | .genmask = genmask, | |
4579 | .fn = nft_flush_set, | |
8411b644 | 4580 | }; |
baa2d42c | 4581 | set->ops->walk(&ctx, set, &iter); |
8411b644 | 4582 | |
baa2d42c | 4583 | return iter.err; |
8411b644 PNA |
4584 | } |
4585 | ||
20a69341 PM |
4586 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
4587 | err = nft_del_setelem(&ctx, set, attr); | |
4588 | if (err < 0) | |
60319eb1 | 4589 | break; |
4fefee57 | 4590 | |
3dd0673a | 4591 | set->ndeact++; |
20a69341 | 4592 | } |
60319eb1 | 4593 | return err; |
20a69341 PM |
4594 | } |
4595 | ||
cfed7e1b PM |
4596 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
4597 | { | |
4598 | struct nft_set_gc_batch *gcb; | |
4599 | unsigned int i; | |
4600 | ||
4601 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
4602 | for (i = 0; i < gcb->head.cnt; i++) | |
61f9e292 | 4603 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); |
cfed7e1b PM |
4604 | kfree(gcb); |
4605 | } | |
4606 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
4607 | ||
4608 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
4609 | gfp_t gfp) | |
4610 | { | |
4611 | struct nft_set_gc_batch *gcb; | |
4612 | ||
4613 | gcb = kzalloc(sizeof(*gcb), gfp); | |
4614 | if (gcb == NULL) | |
4615 | return gcb; | |
4616 | gcb->head.set = set; | |
4617 | return gcb; | |
4618 | } | |
4619 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
4620 | ||
e5009240 PNA |
4621 | /* |
4622 | * Stateful objects | |
4623 | */ | |
4624 | ||
4625 | /** | |
4626 | * nft_register_obj- register nf_tables stateful object type | |
4627 | * @obj: object type | |
4628 | * | |
4629 | * Registers the object type for use with nf_tables. Returns zero on | |
4630 | * success or a negative errno code otherwise. | |
4631 | */ | |
4632 | int nft_register_obj(struct nft_object_type *obj_type) | |
4633 | { | |
4634 | if (obj_type->type == NFT_OBJECT_UNSPEC) | |
4635 | return -EINVAL; | |
4636 | ||
4637 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4638 | list_add_rcu(&obj_type->list, &nf_tables_objects); | |
4639 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4640 | return 0; | |
4641 | } | |
4642 | EXPORT_SYMBOL_GPL(nft_register_obj); | |
4643 | ||
4644 | /** | |
4645 | * nft_unregister_obj - unregister nf_tables object type | |
4646 | * @obj: object type | |
4647 | * | |
4648 | * Unregisters the object type for use with nf_tables. | |
4649 | */ | |
4650 | void nft_unregister_obj(struct nft_object_type *obj_type) | |
4651 | { | |
4652 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4653 | list_del_rcu(&obj_type->list); | |
4654 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4655 | } | |
4656 | EXPORT_SYMBOL_GPL(nft_unregister_obj); | |
4657 | ||
cac20fcd PNA |
4658 | struct nft_object *nft_obj_lookup(const struct nft_table *table, |
4659 | const struct nlattr *nla, u32 objtype, | |
4660 | u8 genmask) | |
e5009240 PNA |
4661 | { |
4662 | struct nft_object *obj; | |
4663 | ||
d9adf22a | 4664 | list_for_each_entry_rcu(obj, &table->objects, list) { |
e5009240 | 4665 | if (!nla_strcmp(nla, obj->name) && |
dfc46034 | 4666 | objtype == obj->ops->type->type && |
e5009240 PNA |
4667 | nft_active_genmask(obj, genmask)) |
4668 | return obj; | |
4669 | } | |
4670 | return ERR_PTR(-ENOENT); | |
4671 | } | |
cac20fcd | 4672 | EXPORT_SYMBOL_GPL(nft_obj_lookup); |
e5009240 | 4673 | |
cac20fcd PNA |
4674 | static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table, |
4675 | const struct nlattr *nla, | |
4676 | u32 objtype, u8 genmask) | |
3ecbfd65 HS |
4677 | { |
4678 | struct nft_object *obj; | |
4679 | ||
4680 | list_for_each_entry(obj, &table->objects, list) { | |
4681 | if (be64_to_cpu(nla_get_be64(nla)) == obj->handle && | |
4682 | objtype == obj->ops->type->type && | |
4683 | nft_active_genmask(obj, genmask)) | |
4684 | return obj; | |
4685 | } | |
4686 | return ERR_PTR(-ENOENT); | |
4687 | } | |
4688 | ||
e5009240 | 4689 | static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { |
b2fbd044 LZ |
4690 | [NFTA_OBJ_TABLE] = { .type = NLA_STRING, |
4691 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
4692 | [NFTA_OBJ_NAME] = { .type = NLA_STRING, | |
4693 | .len = NFT_OBJ_MAXNAMELEN - 1 }, | |
e5009240 PNA |
4694 | [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, |
4695 | [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, | |
3ecbfd65 | 4696 | [NFTA_OBJ_HANDLE] = { .type = NLA_U64}, |
e5009240 PNA |
4697 | }; |
4698 | ||
84fba055 FW |
4699 | static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, |
4700 | const struct nft_object_type *type, | |
e5009240 PNA |
4701 | const struct nlattr *attr) |
4702 | { | |
5b4c6e38 | 4703 | struct nlattr **tb; |
dfc46034 | 4704 | const struct nft_object_ops *ops; |
e5009240 | 4705 | struct nft_object *obj; |
5b4c6e38 GS |
4706 | int err = -ENOMEM; |
4707 | ||
4708 | tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL); | |
4709 | if (!tb) | |
4710 | goto err1; | |
e5009240 PNA |
4711 | |
4712 | if (attr) { | |
fceb6435 JB |
4713 | err = nla_parse_nested(tb, type->maxattr, attr, type->policy, |
4714 | NULL); | |
e5009240 | 4715 | if (err < 0) |
5b4c6e38 | 4716 | goto err2; |
e5009240 PNA |
4717 | } else { |
4718 | memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); | |
4719 | } | |
4720 | ||
dfc46034 PBG |
4721 | if (type->select_ops) { |
4722 | ops = type->select_ops(ctx, (const struct nlattr * const *)tb); | |
4723 | if (IS_ERR(ops)) { | |
4724 | err = PTR_ERR(ops); | |
5b4c6e38 | 4725 | goto err2; |
dfc46034 PBG |
4726 | } |
4727 | } else { | |
4728 | ops = type->ops; | |
4729 | } | |
4730 | ||
e5009240 | 4731 | err = -ENOMEM; |
dfc46034 | 4732 | obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL); |
5b4c6e38 GS |
4733 | if (!obj) |
4734 | goto err2; | |
e5009240 | 4735 | |
dfc46034 | 4736 | err = ops->init(ctx, (const struct nlattr * const *)tb, obj); |
e5009240 | 4737 | if (err < 0) |
5b4c6e38 | 4738 | goto err3; |
e5009240 | 4739 | |
dfc46034 PBG |
4740 | obj->ops = ops; |
4741 | ||
5b4c6e38 | 4742 | kfree(tb); |
e5009240 | 4743 | return obj; |
5b4c6e38 | 4744 | err3: |
e5009240 | 4745 | kfree(obj); |
5b4c6e38 GS |
4746 | err2: |
4747 | kfree(tb); | |
e5009240 PNA |
4748 | err1: |
4749 | return ERR_PTR(err); | |
4750 | } | |
4751 | ||
4752 | static int nft_object_dump(struct sk_buff *skb, unsigned int attr, | |
43da04a5 | 4753 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4754 | { |
4755 | struct nlattr *nest; | |
4756 | ||
4757 | nest = nla_nest_start(skb, attr); | |
4758 | if (!nest) | |
4759 | goto nla_put_failure; | |
dfc46034 | 4760 | if (obj->ops->dump(skb, obj, reset) < 0) |
e5009240 PNA |
4761 | goto nla_put_failure; |
4762 | nla_nest_end(skb, nest); | |
4763 | return 0; | |
4764 | ||
4765 | nla_put_failure: | |
4766 | return -1; | |
4767 | } | |
4768 | ||
4769 | static const struct nft_object_type *__nft_obj_type_get(u32 objtype) | |
4770 | { | |
4771 | const struct nft_object_type *type; | |
4772 | ||
4773 | list_for_each_entry(type, &nf_tables_objects, list) { | |
4774 | if (objtype == type->type) | |
4775 | return type; | |
4776 | } | |
4777 | return NULL; | |
4778 | } | |
4779 | ||
4780 | static const struct nft_object_type *nft_obj_type_get(u32 objtype) | |
4781 | { | |
4782 | const struct nft_object_type *type; | |
4783 | ||
4784 | type = __nft_obj_type_get(objtype); | |
4785 | if (type != NULL && try_module_get(type->owner)) | |
4786 | return type; | |
4787 | ||
4788 | #ifdef CONFIG_MODULES | |
4789 | if (type == NULL) { | |
4790 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4791 | request_module("nft-obj-%u", objtype); | |
4792 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4793 | if (__nft_obj_type_get(objtype)) | |
4794 | return ERR_PTR(-EAGAIN); | |
4795 | } | |
4796 | #endif | |
4797 | return ERR_PTR(-ENOENT); | |
4798 | } | |
4799 | ||
4800 | static int nf_tables_newobj(struct net *net, struct sock *nlsk, | |
4801 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4802 | const struct nlattr * const nla[], |
4803 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4804 | { |
4805 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4806 | const struct nft_object_type *type; | |
4807 | u8 genmask = nft_genmask_next(net); | |
4808 | int family = nfmsg->nfgen_family; | |
e5009240 PNA |
4809 | struct nft_table *table; |
4810 | struct nft_object *obj; | |
4811 | struct nft_ctx ctx; | |
4812 | u32 objtype; | |
4813 | int err; | |
4814 | ||
4815 | if (!nla[NFTA_OBJ_TYPE] || | |
4816 | !nla[NFTA_OBJ_NAME] || | |
4817 | !nla[NFTA_OBJ_DATA]) | |
4818 | return -EINVAL; | |
4819 | ||
cac20fcd | 4820 | table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask); |
36dd1bcc PNA |
4821 | if (IS_ERR(table)) { |
4822 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); | |
e5009240 | 4823 | return PTR_ERR(table); |
36dd1bcc | 4824 | } |
e5009240 PNA |
4825 | |
4826 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
cac20fcd | 4827 | obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); |
e5009240 PNA |
4828 | if (IS_ERR(obj)) { |
4829 | err = PTR_ERR(obj); | |
36dd1bcc PNA |
4830 | if (err != -ENOENT) { |
4831 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); | |
e5009240 | 4832 | return err; |
36dd1bcc | 4833 | } |
1a28ad74 | 4834 | } else { |
36dd1bcc PNA |
4835 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
4836 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); | |
e5009240 | 4837 | return -EEXIST; |
36dd1bcc | 4838 | } |
e5009240 PNA |
4839 | return 0; |
4840 | } | |
4841 | ||
98319cb9 | 4842 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e5009240 PNA |
4843 | |
4844 | type = nft_obj_type_get(objtype); | |
4845 | if (IS_ERR(type)) | |
4846 | return PTR_ERR(type); | |
4847 | ||
84fba055 | 4848 | obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); |
e5009240 PNA |
4849 | if (IS_ERR(obj)) { |
4850 | err = PTR_ERR(obj); | |
4851 | goto err1; | |
4852 | } | |
18965317 | 4853 | obj->table = table; |
3ecbfd65 HS |
4854 | obj->handle = nf_tables_alloc_handle(table); |
4855 | ||
61509575 PS |
4856 | obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL); |
4857 | if (!obj->name) { | |
4858 | err = -ENOMEM; | |
4859 | goto err2; | |
4860 | } | |
e5009240 PNA |
4861 | |
4862 | err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); | |
4863 | if (err < 0) | |
61509575 | 4864 | goto err3; |
e5009240 PNA |
4865 | |
4866 | list_add_tail_rcu(&obj->list, &table->objects); | |
4867 | table->use++; | |
4868 | return 0; | |
61509575 PS |
4869 | err3: |
4870 | kfree(obj->name); | |
e5009240 | 4871 | err2: |
dfc46034 | 4872 | if (obj->ops->destroy) |
00bfb320 | 4873 | obj->ops->destroy(&ctx, obj); |
e5009240 PNA |
4874 | kfree(obj); |
4875 | err1: | |
4876 | module_put(type->owner); | |
4877 | return err; | |
4878 | } | |
4879 | ||
4880 | static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, | |
4881 | u32 portid, u32 seq, int event, u32 flags, | |
4882 | int family, const struct nft_table *table, | |
43da04a5 | 4883 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4884 | { |
4885 | struct nfgenmsg *nfmsg; | |
4886 | struct nlmsghdr *nlh; | |
4887 | ||
dedb67c4 | 4888 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
e5009240 PNA |
4889 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
4890 | if (nlh == NULL) | |
4891 | goto nla_put_failure; | |
4892 | ||
4893 | nfmsg = nlmsg_data(nlh); | |
4894 | nfmsg->nfgen_family = family; | |
4895 | nfmsg->version = NFNETLINK_V0; | |
4896 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4897 | ||
4898 | if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || | |
4899 | nla_put_string(skb, NFTA_OBJ_NAME, obj->name) || | |
dfc46034 | 4900 | nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) || |
e5009240 | 4901 | nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || |
3ecbfd65 HS |
4902 | nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) || |
4903 | nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle), | |
4904 | NFTA_OBJ_PAD)) | |
e5009240 PNA |
4905 | goto nla_put_failure; |
4906 | ||
4907 | nlmsg_end(skb, nlh); | |
4908 | return 0; | |
4909 | ||
4910 | nla_put_failure: | |
4911 | nlmsg_trim(skb, nlh); | |
4912 | return -1; | |
4913 | } | |
4914 | ||
a9fea2a3 | 4915 | struct nft_obj_filter { |
e46abbcc | 4916 | char *table; |
a9fea2a3 PNA |
4917 | u32 type; |
4918 | }; | |
4919 | ||
e5009240 PNA |
4920 | static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) |
4921 | { | |
4922 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
e5009240 | 4923 | const struct nft_table *table; |
e5009240 | 4924 | unsigned int idx = 0, s_idx = cb->args[0]; |
a9fea2a3 | 4925 | struct nft_obj_filter *filter = cb->data; |
e5009240 PNA |
4926 | struct net *net = sock_net(skb->sk); |
4927 | int family = nfmsg->nfgen_family; | |
43da04a5 PNA |
4928 | struct nft_object *obj; |
4929 | bool reset = false; | |
4930 | ||
4931 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) | |
4932 | reset = true; | |
e5009240 PNA |
4933 | |
4934 | rcu_read_lock(); | |
4935 | cb->seq = net->nft.base_seq; | |
4936 | ||
36596dad | 4937 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 4938 | if (family != NFPROTO_UNSPEC && family != table->family) |
e5009240 PNA |
4939 | continue; |
4940 | ||
36596dad PNA |
4941 | list_for_each_entry_rcu(obj, &table->objects, list) { |
4942 | if (!nft_is_active(net, obj)) | |
4943 | goto cont; | |
4944 | if (idx < s_idx) | |
4945 | goto cont; | |
4946 | if (idx > s_idx) | |
4947 | memset(&cb->args[1], 0, | |
4948 | sizeof(cb->args) - sizeof(cb->args[0])); | |
360cc79d | 4949 | if (filter && filter->table && |
36596dad PNA |
4950 | strcmp(filter->table, table->name)) |
4951 | goto cont; | |
4952 | if (filter && | |
4953 | filter->type != NFT_OBJECT_UNSPEC && | |
4954 | obj->ops->type->type != filter->type) | |
4955 | goto cont; | |
a9fea2a3 | 4956 | |
36596dad PNA |
4957 | if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, |
4958 | cb->nlh->nlmsg_seq, | |
4959 | NFT_MSG_NEWOBJ, | |
4960 | NLM_F_MULTI | NLM_F_APPEND, | |
98319cb9 | 4961 | table->family, table, |
36596dad PNA |
4962 | obj, reset) < 0) |
4963 | goto done; | |
e5009240 | 4964 | |
36596dad | 4965 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
e5009240 | 4966 | cont: |
36596dad | 4967 | idx++; |
e5009240 PNA |
4968 | } |
4969 | } | |
4970 | done: | |
4971 | rcu_read_unlock(); | |
4972 | ||
4973 | cb->args[0] = idx; | |
4974 | return skb->len; | |
4975 | } | |
4976 | ||
a9fea2a3 PNA |
4977 | static int nf_tables_dump_obj_done(struct netlink_callback *cb) |
4978 | { | |
e46abbcc PS |
4979 | struct nft_obj_filter *filter = cb->data; |
4980 | ||
8bea728d HL |
4981 | if (filter) { |
4982 | kfree(filter->table); | |
4983 | kfree(filter); | |
4984 | } | |
a9fea2a3 PNA |
4985 | |
4986 | return 0; | |
4987 | } | |
4988 | ||
4989 | static struct nft_obj_filter * | |
4990 | nft_obj_filter_alloc(const struct nlattr * const nla[]) | |
4991 | { | |
4992 | struct nft_obj_filter *filter; | |
4993 | ||
d9adf22a | 4994 | filter = kzalloc(sizeof(*filter), GFP_ATOMIC); |
a9fea2a3 PNA |
4995 | if (!filter) |
4996 | return ERR_PTR(-ENOMEM); | |
4997 | ||
e46abbcc | 4998 | if (nla[NFTA_OBJ_TABLE]) { |
d9adf22a | 4999 | filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC); |
e46abbcc PS |
5000 | if (!filter->table) { |
5001 | kfree(filter); | |
5002 | return ERR_PTR(-ENOMEM); | |
5003 | } | |
5004 | } | |
a9fea2a3 PNA |
5005 | if (nla[NFTA_OBJ_TYPE]) |
5006 | filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
5007 | ||
5008 | return filter; | |
5009 | } | |
5010 | ||
d9adf22a | 5011 | /* called with rcu_read_lock held */ |
e5009240 PNA |
5012 | static int nf_tables_getobj(struct net *net, struct sock *nlsk, |
5013 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
5014 | const struct nlattr * const nla[], |
5015 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
5016 | { |
5017 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5018 | u8 genmask = nft_genmask_cur(net); | |
5019 | int family = nfmsg->nfgen_family; | |
e5009240 PNA |
5020 | const struct nft_table *table; |
5021 | struct nft_object *obj; | |
5022 | struct sk_buff *skb2; | |
43da04a5 | 5023 | bool reset = false; |
e5009240 PNA |
5024 | u32 objtype; |
5025 | int err; | |
5026 | ||
5027 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
5028 | struct netlink_dump_control c = { | |
5029 | .dump = nf_tables_dump_obj, | |
a9fea2a3 | 5030 | .done = nf_tables_dump_obj_done, |
d9adf22a | 5031 | .module = THIS_MODULE, |
e5009240 | 5032 | }; |
a9fea2a3 PNA |
5033 | |
5034 | if (nla[NFTA_OBJ_TABLE] || | |
5035 | nla[NFTA_OBJ_TYPE]) { | |
5036 | struct nft_obj_filter *filter; | |
5037 | ||
5038 | filter = nft_obj_filter_alloc(nla); | |
5039 | if (IS_ERR(filter)) | |
5040 | return -ENOMEM; | |
5041 | ||
5042 | c.data = filter; | |
5043 | } | |
d9adf22a | 5044 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
e5009240 PNA |
5045 | } |
5046 | ||
5047 | if (!nla[NFTA_OBJ_NAME] || | |
5048 | !nla[NFTA_OBJ_TYPE]) | |
5049 | return -EINVAL; | |
5050 | ||
cac20fcd | 5051 | table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask); |
36dd1bcc PNA |
5052 | if (IS_ERR(table)) { |
5053 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); | |
e5009240 | 5054 | return PTR_ERR(table); |
36dd1bcc | 5055 | } |
e5009240 PNA |
5056 | |
5057 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
cac20fcd | 5058 | obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); |
36dd1bcc PNA |
5059 | if (IS_ERR(obj)) { |
5060 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); | |
e5009240 | 5061 | return PTR_ERR(obj); |
36dd1bcc | 5062 | } |
e5009240 | 5063 | |
d9adf22a | 5064 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
e5009240 PNA |
5065 | if (!skb2) |
5066 | return -ENOMEM; | |
5067 | ||
43da04a5 PNA |
5068 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) |
5069 | reset = true; | |
5070 | ||
e5009240 PNA |
5071 | err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, |
5072 | nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, | |
43da04a5 | 5073 | family, table, obj, reset); |
e5009240 PNA |
5074 | if (err < 0) |
5075 | goto err; | |
5076 | ||
5077 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5078 | err: | |
5079 | kfree_skb(skb2); | |
5080 | return err; | |
e5009240 PNA |
5081 | } |
5082 | ||
00bfb320 | 5083 | static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj) |
e5009240 | 5084 | { |
dfc46034 | 5085 | if (obj->ops->destroy) |
00bfb320 | 5086 | obj->ops->destroy(ctx, obj); |
e5009240 | 5087 | |
dfc46034 | 5088 | module_put(obj->ops->type->owner); |
61509575 | 5089 | kfree(obj->name); |
e5009240 PNA |
5090 | kfree(obj); |
5091 | } | |
5092 | ||
5093 | static int nf_tables_delobj(struct net *net, struct sock *nlsk, | |
04ba724b PNA |
5094 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
5095 | const struct nlattr * const nla[], | |
5096 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
5097 | { |
5098 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5099 | u8 genmask = nft_genmask_next(net); | |
5100 | int family = nfmsg->nfgen_family; | |
36dd1bcc | 5101 | const struct nlattr *attr; |
e5009240 PNA |
5102 | struct nft_table *table; |
5103 | struct nft_object *obj; | |
5104 | struct nft_ctx ctx; | |
5105 | u32 objtype; | |
5106 | ||
5107 | if (!nla[NFTA_OBJ_TYPE] || | |
3ecbfd65 | 5108 | (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE])) |
e5009240 PNA |
5109 | return -EINVAL; |
5110 | ||
cac20fcd | 5111 | table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask); |
36dd1bcc PNA |
5112 | if (IS_ERR(table)) { |
5113 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); | |
e5009240 | 5114 | return PTR_ERR(table); |
36dd1bcc | 5115 | } |
e5009240 PNA |
5116 | |
5117 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
36dd1bcc PNA |
5118 | if (nla[NFTA_OBJ_HANDLE]) { |
5119 | attr = nla[NFTA_OBJ_HANDLE]; | |
5120 | obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask); | |
5121 | } else { | |
5122 | attr = nla[NFTA_OBJ_NAME]; | |
5123 | obj = nft_obj_lookup(table, attr, objtype, genmask); | |
5124 | } | |
5125 | ||
5126 | if (IS_ERR(obj)) { | |
5127 | NL_SET_BAD_ATTR(extack, attr); | |
e5009240 | 5128 | return PTR_ERR(obj); |
36dd1bcc PNA |
5129 | } |
5130 | if (obj->use > 0) { | |
5131 | NL_SET_BAD_ATTR(extack, attr); | |
e5009240 | 5132 | return -EBUSY; |
36dd1bcc | 5133 | } |
e5009240 | 5134 | |
98319cb9 | 5135 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e5009240 PNA |
5136 | |
5137 | return nft_delobj(&ctx, obj); | |
5138 | } | |
5139 | ||
25e94a99 PNA |
5140 | void nft_obj_notify(struct net *net, struct nft_table *table, |
5141 | struct nft_object *obj, u32 portid, u32 seq, int event, | |
5142 | int family, int report, gfp_t gfp) | |
e5009240 PNA |
5143 | { |
5144 | struct sk_buff *skb; | |
5145 | int err; | |
5146 | ||
2599e989 PNA |
5147 | if (!report && |
5148 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 5149 | return; |
e5009240 | 5150 | |
2599e989 | 5151 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp); |
e5009240 PNA |
5152 | if (skb == NULL) |
5153 | goto err; | |
5154 | ||
2599e989 PNA |
5155 | err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family, |
5156 | table, obj, false); | |
e5009240 PNA |
5157 | if (err < 0) { |
5158 | kfree_skb(skb); | |
5159 | goto err; | |
5160 | } | |
5161 | ||
25e94a99 PNA |
5162 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp); |
5163 | return; | |
e5009240 | 5164 | err: |
25e94a99 | 5165 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
e5009240 | 5166 | } |
2599e989 PNA |
5167 | EXPORT_SYMBOL_GPL(nft_obj_notify); |
5168 | ||
25e94a99 PNA |
5169 | static void nf_tables_obj_notify(const struct nft_ctx *ctx, |
5170 | struct nft_object *obj, int event) | |
2599e989 | 5171 | { |
25e94a99 | 5172 | nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, |
36596dad | 5173 | ctx->family, ctx->report, GFP_KERNEL); |
2599e989 | 5174 | } |
e5009240 | 5175 | |
3b49e2e9 PNA |
5176 | /* |
5177 | * Flow tables | |
5178 | */ | |
5179 | void nft_register_flowtable_type(struct nf_flowtable_type *type) | |
5180 | { | |
5181 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
5182 | list_add_tail_rcu(&type->list, &nf_tables_flowtables); | |
5183 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
5184 | } | |
5185 | EXPORT_SYMBOL_GPL(nft_register_flowtable_type); | |
5186 | ||
5187 | void nft_unregister_flowtable_type(struct nf_flowtable_type *type) | |
5188 | { | |
5189 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
5190 | list_del_rcu(&type->list); | |
5191 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
5192 | } | |
5193 | EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type); | |
5194 | ||
5195 | static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = { | |
5196 | [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING, | |
5197 | .len = NFT_NAME_MAXLEN - 1 }, | |
5198 | [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING, | |
5199 | .len = NFT_NAME_MAXLEN - 1 }, | |
5200 | [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED }, | |
3ecbfd65 | 5201 | [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 }, |
3b49e2e9 PNA |
5202 | }; |
5203 | ||
cac20fcd PNA |
5204 | struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, |
5205 | const struct nlattr *nla, u8 genmask) | |
3b49e2e9 PNA |
5206 | { |
5207 | struct nft_flowtable *flowtable; | |
5208 | ||
d9adf22a | 5209 | list_for_each_entry_rcu(flowtable, &table->flowtables, list) { |
3b49e2e9 PNA |
5210 | if (!nla_strcmp(nla, flowtable->name) && |
5211 | nft_active_genmask(flowtable, genmask)) | |
5212 | return flowtable; | |
5213 | } | |
5214 | return ERR_PTR(-ENOENT); | |
5215 | } | |
cac20fcd | 5216 | EXPORT_SYMBOL_GPL(nft_flowtable_lookup); |
3b49e2e9 | 5217 | |
ae0662f8 | 5218 | static struct nft_flowtable * |
cac20fcd PNA |
5219 | nft_flowtable_lookup_byhandle(const struct nft_table *table, |
5220 | const struct nlattr *nla, u8 genmask) | |
3ecbfd65 HS |
5221 | { |
5222 | struct nft_flowtable *flowtable; | |
5223 | ||
5224 | list_for_each_entry(flowtable, &table->flowtables, list) { | |
5225 | if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle && | |
5226 | nft_active_genmask(flowtable, genmask)) | |
5227 | return flowtable; | |
5228 | } | |
5229 | return ERR_PTR(-ENOENT); | |
5230 | } | |
5231 | ||
3b49e2e9 PNA |
5232 | static int nf_tables_parse_devices(const struct nft_ctx *ctx, |
5233 | const struct nlattr *attr, | |
5234 | struct net_device *dev_array[], int *len) | |
5235 | { | |
5236 | const struct nlattr *tmp; | |
5237 | struct net_device *dev; | |
5238 | char ifname[IFNAMSIZ]; | |
5239 | int rem, n = 0, err; | |
5240 | ||
5241 | nla_for_each_nested(tmp, attr, rem) { | |
5242 | if (nla_type(tmp) != NFTA_DEVICE_NAME) { | |
5243 | err = -EINVAL; | |
5244 | goto err1; | |
5245 | } | |
5246 | ||
5247 | nla_strlcpy(ifname, tmp, IFNAMSIZ); | |
90d2723c | 5248 | dev = __dev_get_by_name(ctx->net, ifname); |
3b49e2e9 PNA |
5249 | if (!dev) { |
5250 | err = -ENOENT; | |
5251 | goto err1; | |
5252 | } | |
5253 | ||
5254 | dev_array[n++] = dev; | |
5255 | if (n == NFT_FLOWTABLE_DEVICE_MAX) { | |
5256 | err = -EFBIG; | |
5257 | goto err1; | |
5258 | } | |
5259 | } | |
5260 | if (!len) | |
5261 | return -EINVAL; | |
5262 | ||
5263 | err = 0; | |
5264 | err1: | |
5265 | *len = n; | |
5266 | return err; | |
5267 | } | |
5268 | ||
5269 | static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = { | |
5270 | [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 }, | |
5271 | [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
5272 | [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED }, | |
5273 | }; | |
5274 | ||
5275 | static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx, | |
5276 | const struct nlattr *attr, | |
5277 | struct nft_flowtable *flowtable) | |
5278 | { | |
5279 | struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX]; | |
5280 | struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1]; | |
5281 | struct nf_hook_ops *ops; | |
5282 | int hooknum, priority; | |
5283 | int err, n = 0, i; | |
5284 | ||
5285 | err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr, | |
5286 | nft_flowtable_hook_policy, NULL); | |
5287 | if (err < 0) | |
5288 | return err; | |
5289 | ||
5290 | if (!tb[NFTA_FLOWTABLE_HOOK_NUM] || | |
5291 | !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] || | |
5292 | !tb[NFTA_FLOWTABLE_HOOK_DEVS]) | |
5293 | return -EINVAL; | |
5294 | ||
5295 | hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); | |
fe19c04c | 5296 | if (hooknum != NF_NETDEV_INGRESS) |
3b49e2e9 PNA |
5297 | return -EINVAL; |
5298 | ||
5299 | priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); | |
5300 | ||
5301 | err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS], | |
5302 | dev_array, &n); | |
5303 | if (err < 0) | |
d92191aa | 5304 | return err; |
3b49e2e9 PNA |
5305 | |
5306 | ops = kzalloc(sizeof(struct nf_hook_ops) * n, GFP_KERNEL); | |
90d2723c PNA |
5307 | if (!ops) |
5308 | return -ENOMEM; | |
3b49e2e9 | 5309 | |
0e839dfa PNA |
5310 | flowtable->hooknum = hooknum; |
5311 | flowtable->priority = priority; | |
3b49e2e9 PNA |
5312 | flowtable->ops = ops; |
5313 | flowtable->ops_len = n; | |
5314 | ||
5315 | for (i = 0; i < n; i++) { | |
5316 | flowtable->ops[i].pf = NFPROTO_NETDEV; | |
5317 | flowtable->ops[i].hooknum = hooknum; | |
5318 | flowtable->ops[i].priority = priority; | |
17857d92 | 5319 | flowtable->ops[i].priv = &flowtable->data; |
3b49e2e9 PNA |
5320 | flowtable->ops[i].hook = flowtable->data.type->hook; |
5321 | flowtable->ops[i].dev = dev_array[i]; | |
d92191aa PNA |
5322 | flowtable->dev_name[i] = kstrdup(dev_array[i]->name, |
5323 | GFP_KERNEL); | |
3b49e2e9 PNA |
5324 | } |
5325 | ||
3b49e2e9 PNA |
5326 | return err; |
5327 | } | |
5328 | ||
98319cb9 | 5329 | static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family) |
3b49e2e9 PNA |
5330 | { |
5331 | const struct nf_flowtable_type *type; | |
5332 | ||
5333 | list_for_each_entry(type, &nf_tables_flowtables, list) { | |
98319cb9 | 5334 | if (family == type->family) |
3b49e2e9 PNA |
5335 | return type; |
5336 | } | |
5337 | return NULL; | |
5338 | } | |
5339 | ||
98319cb9 | 5340 | static const struct nf_flowtable_type *nft_flowtable_type_get(u8 family) |
3b49e2e9 PNA |
5341 | { |
5342 | const struct nf_flowtable_type *type; | |
5343 | ||
98319cb9 | 5344 | type = __nft_flowtable_type_get(family); |
3b49e2e9 PNA |
5345 | if (type != NULL && try_module_get(type->owner)) |
5346 | return type; | |
5347 | ||
5348 | #ifdef CONFIG_MODULES | |
5349 | if (type == NULL) { | |
5350 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
98319cb9 | 5351 | request_module("nf-flowtable-%u", family); |
3b49e2e9 | 5352 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
98319cb9 | 5353 | if (__nft_flowtable_type_get(family)) |
3b49e2e9 PNA |
5354 | return ERR_PTR(-EAGAIN); |
5355 | } | |
5356 | #endif | |
5357 | return ERR_PTR(-ENOENT); | |
5358 | } | |
5359 | ||
3b49e2e9 PNA |
5360 | static void nft_unregister_flowtable_net_hooks(struct net *net, |
5361 | struct nft_flowtable *flowtable) | |
5362 | { | |
5363 | int i; | |
5364 | ||
5365 | for (i = 0; i < flowtable->ops_len; i++) { | |
5366 | if (!flowtable->ops[i].dev) | |
5367 | continue; | |
5368 | ||
5369 | nf_unregister_net_hook(net, &flowtable->ops[i]); | |
5370 | } | |
5371 | } | |
5372 | ||
5373 | static int nf_tables_newflowtable(struct net *net, struct sock *nlsk, | |
5374 | struct sk_buff *skb, | |
5375 | const struct nlmsghdr *nlh, | |
5376 | const struct nlattr * const nla[], | |
5377 | struct netlink_ext_ack *extack) | |
5378 | { | |
5379 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5380 | const struct nf_flowtable_type *type; | |
32fc7187 | 5381 | struct nft_flowtable *flowtable, *ft; |
3b49e2e9 PNA |
5382 | u8 genmask = nft_genmask_next(net); |
5383 | int family = nfmsg->nfgen_family; | |
3b49e2e9 PNA |
5384 | struct nft_table *table; |
5385 | struct nft_ctx ctx; | |
5386 | int err, i, k; | |
5387 | ||
5388 | if (!nla[NFTA_FLOWTABLE_TABLE] || | |
5389 | !nla[NFTA_FLOWTABLE_NAME] || | |
5390 | !nla[NFTA_FLOWTABLE_HOOK]) | |
5391 | return -EINVAL; | |
5392 | ||
cac20fcd PNA |
5393 | table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, |
5394 | genmask); | |
36dd1bcc PNA |
5395 | if (IS_ERR(table)) { |
5396 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); | |
3b49e2e9 | 5397 | return PTR_ERR(table); |
36dd1bcc | 5398 | } |
3b49e2e9 | 5399 | |
cac20fcd PNA |
5400 | flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], |
5401 | genmask); | |
3b49e2e9 PNA |
5402 | if (IS_ERR(flowtable)) { |
5403 | err = PTR_ERR(flowtable); | |
36dd1bcc PNA |
5404 | if (err != -ENOENT) { |
5405 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); | |
3b49e2e9 | 5406 | return err; |
36dd1bcc | 5407 | } |
3b49e2e9 | 5408 | } else { |
36dd1bcc PNA |
5409 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
5410 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); | |
3b49e2e9 | 5411 | return -EEXIST; |
36dd1bcc | 5412 | } |
3b49e2e9 PNA |
5413 | |
5414 | return 0; | |
5415 | } | |
5416 | ||
98319cb9 | 5417 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
3b49e2e9 PNA |
5418 | |
5419 | flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL); | |
5420 | if (!flowtable) | |
5421 | return -ENOMEM; | |
5422 | ||
5423 | flowtable->table = table; | |
3ecbfd65 HS |
5424 | flowtable->handle = nf_tables_alloc_handle(table); |
5425 | ||
3b49e2e9 PNA |
5426 | flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL); |
5427 | if (!flowtable->name) { | |
5428 | err = -ENOMEM; | |
5429 | goto err1; | |
5430 | } | |
5431 | ||
98319cb9 | 5432 | type = nft_flowtable_type_get(family); |
3b49e2e9 PNA |
5433 | if (IS_ERR(type)) { |
5434 | err = PTR_ERR(type); | |
5435 | goto err2; | |
5436 | } | |
5437 | ||
5438 | flowtable->data.type = type; | |
a268de77 | 5439 | err = type->init(&flowtable->data); |
3b49e2e9 PNA |
5440 | if (err < 0) |
5441 | goto err3; | |
5442 | ||
5443 | err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK], | |
5444 | flowtable); | |
5445 | if (err < 0) | |
a268de77 | 5446 | goto err4; |
3b49e2e9 PNA |
5447 | |
5448 | for (i = 0; i < flowtable->ops_len; i++) { | |
32fc7187 PNA |
5449 | if (!flowtable->ops[i].dev) |
5450 | continue; | |
5451 | ||
5452 | list_for_each_entry(ft, &table->flowtables, list) { | |
5453 | for (k = 0; k < ft->ops_len; k++) { | |
5454 | if (!ft->ops[k].dev) | |
5455 | continue; | |
5456 | ||
5457 | if (flowtable->ops[i].dev == ft->ops[k].dev && | |
5458 | flowtable->ops[i].pf == ft->ops[k].pf) { | |
5459 | err = -EBUSY; | |
a268de77 | 5460 | goto err5; |
32fc7187 PNA |
5461 | } |
5462 | } | |
5463 | } | |
5464 | ||
3b49e2e9 PNA |
5465 | err = nf_register_net_hook(net, &flowtable->ops[i]); |
5466 | if (err < 0) | |
a268de77 | 5467 | goto err5; |
3b49e2e9 PNA |
5468 | } |
5469 | ||
5470 | err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable); | |
5471 | if (err < 0) | |
a268de77 | 5472 | goto err6; |
3b49e2e9 PNA |
5473 | |
5474 | list_add_tail_rcu(&flowtable->list, &table->flowtables); | |
5475 | table->use++; | |
5476 | ||
5477 | return 0; | |
a268de77 | 5478 | err6: |
3b49e2e9 | 5479 | i = flowtable->ops_len; |
a268de77 | 5480 | err5: |
d92191aa PNA |
5481 | for (k = i - 1; k >= 0; k--) { |
5482 | kfree(flowtable->dev_name[k]); | |
0e0d5002 | 5483 | nf_unregister_net_hook(net, &flowtable->ops[k]); |
d92191aa | 5484 | } |
3b49e2e9 PNA |
5485 | |
5486 | kfree(flowtable->ops); | |
a268de77 FF |
5487 | err4: |
5488 | flowtable->data.type->free(&flowtable->data); | |
3b49e2e9 PNA |
5489 | err3: |
5490 | module_put(type->owner); | |
5491 | err2: | |
5492 | kfree(flowtable->name); | |
5493 | err1: | |
5494 | kfree(flowtable); | |
5495 | return err; | |
5496 | } | |
5497 | ||
5498 | static int nf_tables_delflowtable(struct net *net, struct sock *nlsk, | |
5499 | struct sk_buff *skb, | |
5500 | const struct nlmsghdr *nlh, | |
5501 | const struct nlattr * const nla[], | |
5502 | struct netlink_ext_ack *extack) | |
5503 | { | |
5504 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5505 | u8 genmask = nft_genmask_next(net); | |
5506 | int family = nfmsg->nfgen_family; | |
5507 | struct nft_flowtable *flowtable; | |
36dd1bcc | 5508 | const struct nlattr *attr; |
3b49e2e9 PNA |
5509 | struct nft_table *table; |
5510 | struct nft_ctx ctx; | |
5511 | ||
e603ea4b PNA |
5512 | if (!nla[NFTA_FLOWTABLE_TABLE] || |
5513 | (!nla[NFTA_FLOWTABLE_NAME] && | |
5514 | !nla[NFTA_FLOWTABLE_HANDLE])) | |
5515 | return -EINVAL; | |
5516 | ||
cac20fcd PNA |
5517 | table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, |
5518 | genmask); | |
36dd1bcc PNA |
5519 | if (IS_ERR(table)) { |
5520 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); | |
3b49e2e9 | 5521 | return PTR_ERR(table); |
36dd1bcc | 5522 | } |
3b49e2e9 | 5523 | |
36dd1bcc PNA |
5524 | if (nla[NFTA_FLOWTABLE_HANDLE]) { |
5525 | attr = nla[NFTA_FLOWTABLE_HANDLE]; | |
5526 | flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask); | |
5527 | } else { | |
5528 | attr = nla[NFTA_FLOWTABLE_NAME]; | |
5529 | flowtable = nft_flowtable_lookup(table, attr, genmask); | |
5530 | } | |
5531 | ||
5532 | if (IS_ERR(flowtable)) { | |
5533 | NL_SET_BAD_ATTR(extack, attr); | |
5534 | return PTR_ERR(flowtable); | |
5535 | } | |
5536 | if (flowtable->use > 0) { | |
5537 | NL_SET_BAD_ATTR(extack, attr); | |
3b49e2e9 | 5538 | return -EBUSY; |
36dd1bcc | 5539 | } |
3b49e2e9 | 5540 | |
98319cb9 | 5541 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
3b49e2e9 PNA |
5542 | |
5543 | return nft_delflowtable(&ctx, flowtable); | |
5544 | } | |
5545 | ||
5546 | static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net, | |
5547 | u32 portid, u32 seq, int event, | |
5548 | u32 flags, int family, | |
5549 | struct nft_flowtable *flowtable) | |
5550 | { | |
5551 | struct nlattr *nest, *nest_devs; | |
5552 | struct nfgenmsg *nfmsg; | |
5553 | struct nlmsghdr *nlh; | |
5554 | int i; | |
5555 | ||
5556 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); | |
5557 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
5558 | if (nlh == NULL) | |
5559 | goto nla_put_failure; | |
5560 | ||
5561 | nfmsg = nlmsg_data(nlh); | |
5562 | nfmsg->nfgen_family = family; | |
5563 | nfmsg->version = NFNETLINK_V0; | |
5564 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
5565 | ||
5566 | if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) || | |
5567 | nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) || | |
3ecbfd65 HS |
5568 | nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) || |
5569 | nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle), | |
5570 | NFTA_FLOWTABLE_PAD)) | |
3b49e2e9 PNA |
5571 | goto nla_put_failure; |
5572 | ||
5573 | nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK); | |
5574 | if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) || | |
5575 | nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority))) | |
5576 | goto nla_put_failure; | |
5577 | ||
5578 | nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS); | |
5579 | if (!nest_devs) | |
5580 | goto nla_put_failure; | |
5581 | ||
5582 | for (i = 0; i < flowtable->ops_len; i++) { | |
d92191aa | 5583 | if (flowtable->dev_name[i][0] && |
3b49e2e9 | 5584 | nla_put_string(skb, NFTA_DEVICE_NAME, |
d92191aa | 5585 | flowtable->dev_name[i])) |
3b49e2e9 PNA |
5586 | goto nla_put_failure; |
5587 | } | |
5588 | nla_nest_end(skb, nest_devs); | |
5589 | nla_nest_end(skb, nest); | |
5590 | ||
5591 | nlmsg_end(skb, nlh); | |
5592 | return 0; | |
5593 | ||
5594 | nla_put_failure: | |
5595 | nlmsg_trim(skb, nlh); | |
5596 | return -1; | |
5597 | } | |
5598 | ||
5599 | struct nft_flowtable_filter { | |
5600 | char *table; | |
5601 | }; | |
5602 | ||
5603 | static int nf_tables_dump_flowtable(struct sk_buff *skb, | |
5604 | struct netlink_callback *cb) | |
5605 | { | |
5606 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
5607 | struct nft_flowtable_filter *filter = cb->data; | |
5608 | unsigned int idx = 0, s_idx = cb->args[0]; | |
5609 | struct net *net = sock_net(skb->sk); | |
5610 | int family = nfmsg->nfgen_family; | |
5611 | struct nft_flowtable *flowtable; | |
3b49e2e9 PNA |
5612 | const struct nft_table *table; |
5613 | ||
5614 | rcu_read_lock(); | |
5615 | cb->seq = net->nft.base_seq; | |
5616 | ||
36596dad | 5617 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 5618 | if (family != NFPROTO_UNSPEC && family != table->family) |
3b49e2e9 PNA |
5619 | continue; |
5620 | ||
36596dad PNA |
5621 | list_for_each_entry_rcu(flowtable, &table->flowtables, list) { |
5622 | if (!nft_is_active(net, flowtable)) | |
5623 | goto cont; | |
5624 | if (idx < s_idx) | |
5625 | goto cont; | |
5626 | if (idx > s_idx) | |
5627 | memset(&cb->args[1], 0, | |
5628 | sizeof(cb->args) - sizeof(cb->args[0])); | |
360cc79d | 5629 | if (filter && filter->table && |
36596dad PNA |
5630 | strcmp(filter->table, table->name)) |
5631 | goto cont; | |
3b49e2e9 | 5632 | |
36596dad PNA |
5633 | if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid, |
5634 | cb->nlh->nlmsg_seq, | |
5635 | NFT_MSG_NEWFLOWTABLE, | |
5636 | NLM_F_MULTI | NLM_F_APPEND, | |
98319cb9 | 5637 | table->family, flowtable) < 0) |
36596dad | 5638 | goto done; |
3b49e2e9 | 5639 | |
36596dad | 5640 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
3b49e2e9 | 5641 | cont: |
36596dad | 5642 | idx++; |
3b49e2e9 PNA |
5643 | } |
5644 | } | |
5645 | done: | |
5646 | rcu_read_unlock(); | |
5647 | ||
5648 | cb->args[0] = idx; | |
5649 | return skb->len; | |
5650 | } | |
5651 | ||
5652 | static int nf_tables_dump_flowtable_done(struct netlink_callback *cb) | |
5653 | { | |
5654 | struct nft_flowtable_filter *filter = cb->data; | |
5655 | ||
5656 | if (!filter) | |
5657 | return 0; | |
5658 | ||
5659 | kfree(filter->table); | |
5660 | kfree(filter); | |
5661 | ||
5662 | return 0; | |
5663 | } | |
5664 | ||
5665 | static struct nft_flowtable_filter * | |
5666 | nft_flowtable_filter_alloc(const struct nlattr * const nla[]) | |
5667 | { | |
5668 | struct nft_flowtable_filter *filter; | |
5669 | ||
d9adf22a | 5670 | filter = kzalloc(sizeof(*filter), GFP_ATOMIC); |
3b49e2e9 PNA |
5671 | if (!filter) |
5672 | return ERR_PTR(-ENOMEM); | |
5673 | ||
5674 | if (nla[NFTA_FLOWTABLE_TABLE]) { | |
5675 | filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE], | |
d9adf22a | 5676 | GFP_ATOMIC); |
3b49e2e9 PNA |
5677 | if (!filter->table) { |
5678 | kfree(filter); | |
5679 | return ERR_PTR(-ENOMEM); | |
5680 | } | |
5681 | } | |
5682 | return filter; | |
5683 | } | |
5684 | ||
d9adf22a | 5685 | /* called with rcu_read_lock held */ |
3b49e2e9 PNA |
5686 | static int nf_tables_getflowtable(struct net *net, struct sock *nlsk, |
5687 | struct sk_buff *skb, | |
5688 | const struct nlmsghdr *nlh, | |
5689 | const struct nlattr * const nla[], | |
5690 | struct netlink_ext_ack *extack) | |
5691 | { | |
5692 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5693 | u8 genmask = nft_genmask_cur(net); | |
5694 | int family = nfmsg->nfgen_family; | |
5695 | struct nft_flowtable *flowtable; | |
3b49e2e9 PNA |
5696 | const struct nft_table *table; |
5697 | struct sk_buff *skb2; | |
5698 | int err; | |
5699 | ||
5700 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
5701 | struct netlink_dump_control c = { | |
5702 | .dump = nf_tables_dump_flowtable, | |
5703 | .done = nf_tables_dump_flowtable_done, | |
d9adf22a | 5704 | .module = THIS_MODULE, |
3b49e2e9 PNA |
5705 | }; |
5706 | ||
5707 | if (nla[NFTA_FLOWTABLE_TABLE]) { | |
5708 | struct nft_flowtable_filter *filter; | |
5709 | ||
5710 | filter = nft_flowtable_filter_alloc(nla); | |
5711 | if (IS_ERR(filter)) | |
5712 | return -ENOMEM; | |
5713 | ||
5714 | c.data = filter; | |
5715 | } | |
d9adf22a | 5716 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
3b49e2e9 PNA |
5717 | } |
5718 | ||
5719 | if (!nla[NFTA_FLOWTABLE_NAME]) | |
5720 | return -EINVAL; | |
5721 | ||
cac20fcd PNA |
5722 | table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, |
5723 | genmask); | |
3b49e2e9 PNA |
5724 | if (IS_ERR(table)) |
5725 | return PTR_ERR(table); | |
5726 | ||
cac20fcd PNA |
5727 | flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], |
5728 | genmask); | |
03a0120f | 5729 | if (IS_ERR(flowtable)) |
3b49e2e9 PNA |
5730 | return PTR_ERR(flowtable); |
5731 | ||
d9adf22a | 5732 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
3b49e2e9 PNA |
5733 | if (!skb2) |
5734 | return -ENOMEM; | |
5735 | ||
5736 | err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid, | |
5737 | nlh->nlmsg_seq, | |
5738 | NFT_MSG_NEWFLOWTABLE, 0, family, | |
5739 | flowtable); | |
5740 | if (err < 0) | |
5741 | goto err; | |
5742 | ||
5743 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5744 | err: | |
5745 | kfree_skb(skb2); | |
5746 | return err; | |
5747 | } | |
5748 | ||
5749 | static void nf_tables_flowtable_notify(struct nft_ctx *ctx, | |
5750 | struct nft_flowtable *flowtable, | |
5751 | int event) | |
5752 | { | |
5753 | struct sk_buff *skb; | |
5754 | int err; | |
5755 | ||
5756 | if (ctx->report && | |
5757 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
5758 | return; | |
5759 | ||
5760 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
5761 | if (skb == NULL) | |
5762 | goto err; | |
5763 | ||
5764 | err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid, | |
5765 | ctx->seq, event, 0, | |
36596dad | 5766 | ctx->family, flowtable); |
3b49e2e9 PNA |
5767 | if (err < 0) { |
5768 | kfree_skb(skb); | |
5769 | goto err; | |
5770 | } | |
5771 | ||
5772 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
5773 | ctx->report, GFP_KERNEL); | |
5774 | return; | |
5775 | err: | |
5776 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); | |
5777 | } | |
5778 | ||
3b49e2e9 PNA |
5779 | static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable) |
5780 | { | |
c04a3f73 | 5781 | kfree(flowtable->ops); |
3b49e2e9 | 5782 | kfree(flowtable->name); |
b408c5b0 | 5783 | flowtable->data.type->free(&flowtable->data); |
3b49e2e9 PNA |
5784 | module_put(flowtable->data.type->owner); |
5785 | } | |
5786 | ||
84d7fce6 PNA |
5787 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
5788 | u32 portid, u32 seq) | |
5789 | { | |
5790 | struct nlmsghdr *nlh; | |
5791 | struct nfgenmsg *nfmsg; | |
784b4e61 | 5792 | char buf[TASK_COMM_LEN]; |
dedb67c4 | 5793 | int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); |
84d7fce6 PNA |
5794 | |
5795 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
5796 | if (nlh == NULL) | |
5797 | goto nla_put_failure; | |
5798 | ||
5799 | nfmsg = nlmsg_data(nlh); | |
5800 | nfmsg->nfgen_family = AF_UNSPEC; | |
5801 | nfmsg->version = NFNETLINK_V0; | |
5802 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
5803 | ||
784b4e61 PS |
5804 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) || |
5805 | nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) || | |
5806 | nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current))) | |
84d7fce6 PNA |
5807 | goto nla_put_failure; |
5808 | ||
053c095a JB |
5809 | nlmsg_end(skb, nlh); |
5810 | return 0; | |
84d7fce6 PNA |
5811 | |
5812 | nla_put_failure: | |
5813 | nlmsg_trim(skb, nlh); | |
5814 | return -EMSGSIZE; | |
5815 | } | |
5816 | ||
3b49e2e9 PNA |
5817 | static void nft_flowtable_event(unsigned long event, struct net_device *dev, |
5818 | struct nft_flowtable *flowtable) | |
5819 | { | |
5820 | int i; | |
5821 | ||
5822 | for (i = 0; i < flowtable->ops_len; i++) { | |
5823 | if (flowtable->ops[i].dev != dev) | |
5824 | continue; | |
5825 | ||
5826 | nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]); | |
d92191aa | 5827 | flowtable->dev_name[i][0] = '\0'; |
3b49e2e9 PNA |
5828 | flowtable->ops[i].dev = NULL; |
5829 | break; | |
5830 | } | |
5831 | } | |
5832 | ||
5833 | static int nf_tables_flowtable_event(struct notifier_block *this, | |
5834 | unsigned long event, void *ptr) | |
5835 | { | |
5836 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
5837 | struct nft_flowtable *flowtable; | |
5838 | struct nft_table *table; | |
3b49e2e9 PNA |
5839 | |
5840 | if (event != NETDEV_UNREGISTER) | |
5841 | return 0; | |
5842 | ||
5843 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
36596dad PNA |
5844 | list_for_each_entry(table, &dev_net(dev)->nft.tables, list) { |
5845 | list_for_each_entry(flowtable, &table->flowtables, list) { | |
5846 | nft_flowtable_event(event, dev, flowtable); | |
3b49e2e9 PNA |
5847 | } |
5848 | } | |
5849 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
5850 | ||
5851 | return NOTIFY_DONE; | |
5852 | } | |
5853 | ||
5854 | static struct notifier_block nf_tables_flowtable_notifier = { | |
5855 | .notifier_call = nf_tables_flowtable_event, | |
5856 | }; | |
5857 | ||
25e94a99 PNA |
5858 | static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, |
5859 | int event) | |
84d7fce6 PNA |
5860 | { |
5861 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
5862 | struct sk_buff *skb2; | |
5863 | int err; | |
5864 | ||
5865 | if (nlmsg_report(nlh) && | |
5866 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 5867 | return; |
84d7fce6 | 5868 | |
84d7fce6 PNA |
5869 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
5870 | if (skb2 == NULL) | |
5871 | goto err; | |
5872 | ||
5873 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
5874 | nlh->nlmsg_seq); | |
5875 | if (err < 0) { | |
5876 | kfree_skb(skb2); | |
5877 | goto err; | |
5878 | } | |
5879 | ||
25e94a99 PNA |
5880 | nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
5881 | nlmsg_report(nlh), GFP_KERNEL); | |
5882 | return; | |
84d7fce6 | 5883 | err: |
25e94a99 PNA |
5884 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
5885 | -ENOBUFS); | |
84d7fce6 PNA |
5886 | } |
5887 | ||
7b8002a1 PNA |
5888 | static int nf_tables_getgen(struct net *net, struct sock *nlsk, |
5889 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
5890 | const struct nlattr * const nla[], |
5891 | struct netlink_ext_ack *extack) | |
84d7fce6 | 5892 | { |
84d7fce6 PNA |
5893 | struct sk_buff *skb2; |
5894 | int err; | |
5895 | ||
d9adf22a | 5896 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
84d7fce6 PNA |
5897 | if (skb2 == NULL) |
5898 | return -ENOMEM; | |
5899 | ||
5900 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
5901 | nlh->nlmsg_seq); | |
5902 | if (err < 0) | |
5903 | goto err; | |
5904 | ||
5905 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5906 | err: | |
5907 | kfree_skb(skb2); | |
5908 | return err; | |
5909 | } | |
5910 | ||
96518518 PM |
5911 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
5912 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 5913 | .call_batch = nf_tables_newtable, |
96518518 PM |
5914 | .attr_count = NFTA_TABLE_MAX, |
5915 | .policy = nft_table_policy, | |
5916 | }, | |
5917 | [NFT_MSG_GETTABLE] = { | |
d9adf22a | 5918 | .call_rcu = nf_tables_gettable, |
96518518 PM |
5919 | .attr_count = NFTA_TABLE_MAX, |
5920 | .policy = nft_table_policy, | |
5921 | }, | |
5922 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 5923 | .call_batch = nf_tables_deltable, |
96518518 PM |
5924 | .attr_count = NFTA_TABLE_MAX, |
5925 | .policy = nft_table_policy, | |
5926 | }, | |
5927 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 5928 | .call_batch = nf_tables_newchain, |
96518518 PM |
5929 | .attr_count = NFTA_CHAIN_MAX, |
5930 | .policy = nft_chain_policy, | |
5931 | }, | |
5932 | [NFT_MSG_GETCHAIN] = { | |
d9adf22a | 5933 | .call_rcu = nf_tables_getchain, |
96518518 PM |
5934 | .attr_count = NFTA_CHAIN_MAX, |
5935 | .policy = nft_chain_policy, | |
5936 | }, | |
5937 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 5938 | .call_batch = nf_tables_delchain, |
96518518 PM |
5939 | .attr_count = NFTA_CHAIN_MAX, |
5940 | .policy = nft_chain_policy, | |
5941 | }, | |
5942 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 5943 | .call_batch = nf_tables_newrule, |
96518518 PM |
5944 | .attr_count = NFTA_RULE_MAX, |
5945 | .policy = nft_rule_policy, | |
5946 | }, | |
5947 | [NFT_MSG_GETRULE] = { | |
d9adf22a | 5948 | .call_rcu = nf_tables_getrule, |
96518518 PM |
5949 | .attr_count = NFTA_RULE_MAX, |
5950 | .policy = nft_rule_policy, | |
5951 | }, | |
5952 | [NFT_MSG_DELRULE] = { | |
0628b123 | 5953 | .call_batch = nf_tables_delrule, |
96518518 PM |
5954 | .attr_count = NFTA_RULE_MAX, |
5955 | .policy = nft_rule_policy, | |
5956 | }, | |
20a69341 | 5957 | [NFT_MSG_NEWSET] = { |
958bee14 | 5958 | .call_batch = nf_tables_newset, |
20a69341 PM |
5959 | .attr_count = NFTA_SET_MAX, |
5960 | .policy = nft_set_policy, | |
5961 | }, | |
5962 | [NFT_MSG_GETSET] = { | |
d9adf22a | 5963 | .call_rcu = nf_tables_getset, |
20a69341 PM |
5964 | .attr_count = NFTA_SET_MAX, |
5965 | .policy = nft_set_policy, | |
5966 | }, | |
5967 | [NFT_MSG_DELSET] = { | |
958bee14 | 5968 | .call_batch = nf_tables_delset, |
20a69341 PM |
5969 | .attr_count = NFTA_SET_MAX, |
5970 | .policy = nft_set_policy, | |
5971 | }, | |
5972 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 5973 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
5974 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
5975 | .policy = nft_set_elem_list_policy, | |
5976 | }, | |
5977 | [NFT_MSG_GETSETELEM] = { | |
d9adf22a | 5978 | .call_rcu = nf_tables_getsetelem, |
20a69341 PM |
5979 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
5980 | .policy = nft_set_elem_list_policy, | |
5981 | }, | |
5982 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 5983 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
5984 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
5985 | .policy = nft_set_elem_list_policy, | |
5986 | }, | |
84d7fce6 | 5987 | [NFT_MSG_GETGEN] = { |
d9adf22a | 5988 | .call_rcu = nf_tables_getgen, |
84d7fce6 | 5989 | }, |
e5009240 PNA |
5990 | [NFT_MSG_NEWOBJ] = { |
5991 | .call_batch = nf_tables_newobj, | |
5992 | .attr_count = NFTA_OBJ_MAX, | |
5993 | .policy = nft_obj_policy, | |
5994 | }, | |
5995 | [NFT_MSG_GETOBJ] = { | |
d9adf22a | 5996 | .call_rcu = nf_tables_getobj, |
e5009240 PNA |
5997 | .attr_count = NFTA_OBJ_MAX, |
5998 | .policy = nft_obj_policy, | |
5999 | }, | |
6000 | [NFT_MSG_DELOBJ] = { | |
6001 | .call_batch = nf_tables_delobj, | |
6002 | .attr_count = NFTA_OBJ_MAX, | |
6003 | .policy = nft_obj_policy, | |
6004 | }, | |
43da04a5 | 6005 | [NFT_MSG_GETOBJ_RESET] = { |
d9adf22a | 6006 | .call_rcu = nf_tables_getobj, |
43da04a5 PNA |
6007 | .attr_count = NFTA_OBJ_MAX, |
6008 | .policy = nft_obj_policy, | |
6009 | }, | |
3b49e2e9 PNA |
6010 | [NFT_MSG_NEWFLOWTABLE] = { |
6011 | .call_batch = nf_tables_newflowtable, | |
6012 | .attr_count = NFTA_FLOWTABLE_MAX, | |
6013 | .policy = nft_flowtable_policy, | |
6014 | }, | |
6015 | [NFT_MSG_GETFLOWTABLE] = { | |
d9adf22a | 6016 | .call_rcu = nf_tables_getflowtable, |
3b49e2e9 PNA |
6017 | .attr_count = NFTA_FLOWTABLE_MAX, |
6018 | .policy = nft_flowtable_policy, | |
6019 | }, | |
6020 | [NFT_MSG_DELFLOWTABLE] = { | |
6021 | .call_batch = nf_tables_delflowtable, | |
6022 | .attr_count = NFTA_FLOWTABLE_MAX, | |
6023 | .policy = nft_flowtable_policy, | |
6024 | }, | |
96518518 PM |
6025 | }; |
6026 | ||
a654de8f PNA |
6027 | static int nf_tables_validate(struct net *net) |
6028 | { | |
6029 | struct nft_table *table; | |
6030 | ||
6031 | switch (net->nft.validate_state) { | |
6032 | case NFT_VALIDATE_SKIP: | |
6033 | break; | |
6034 | case NFT_VALIDATE_NEED: | |
6035 | nft_validate_state_update(net, NFT_VALIDATE_DO); | |
6036 | /* fall through */ | |
6037 | case NFT_VALIDATE_DO: | |
6038 | list_for_each_entry(table, &net->nft.tables, list) { | |
6039 | if (nft_table_validate(net, table) < 0) | |
6040 | return -EAGAIN; | |
6041 | } | |
6042 | break; | |
6043 | } | |
6044 | ||
6045 | return 0; | |
6046 | } | |
6047 | ||
91c7b38d PNA |
6048 | static void nft_chain_commit_update(struct nft_trans *trans) |
6049 | { | |
6050 | struct nft_base_chain *basechain; | |
6051 | ||
1b2470e5 FW |
6052 | if (nft_trans_chain_name(trans)) { |
6053 | rhltable_remove(&trans->ctx.table->chains_ht, | |
6054 | &trans->ctx.chain->rhlhead, | |
6055 | nft_chain_ht_params); | |
d71efb59 | 6056 | swap(trans->ctx.chain->name, nft_trans_chain_name(trans)); |
1b2470e5 FW |
6057 | rhltable_insert_key(&trans->ctx.table->chains_ht, |
6058 | trans->ctx.chain->name, | |
6059 | &trans->ctx.chain->rhlhead, | |
6060 | nft_chain_ht_params); | |
6061 | } | |
91c7b38d | 6062 | |
f323d954 | 6063 | if (!nft_is_base_chain(trans->ctx.chain)) |
91c7b38d PNA |
6064 | return; |
6065 | ||
6066 | basechain = nft_base_chain(trans->ctx.chain); | |
6067 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
6068 | ||
6069 | switch (nft_trans_chain_policy(trans)) { | |
6070 | case NF_DROP: | |
6071 | case NF_ACCEPT: | |
6072 | basechain->policy = nft_trans_chain_policy(trans); | |
6073 | break; | |
6074 | } | |
6075 | } | |
6076 | ||
2f99aa31 | 6077 | static void nft_commit_release(struct nft_trans *trans) |
c7c32e72 | 6078 | { |
c7c32e72 PNA |
6079 | switch (trans->msg_type) { |
6080 | case NFT_MSG_DELTABLE: | |
6081 | nf_tables_table_destroy(&trans->ctx); | |
6082 | break; | |
6083 | case NFT_MSG_DELCHAIN: | |
43a605f2 | 6084 | nf_tables_chain_destroy(&trans->ctx); |
c7c32e72 PNA |
6085 | break; |
6086 | case NFT_MSG_DELRULE: | |
6087 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
6088 | break; | |
6089 | case NFT_MSG_DELSET: | |
6090 | nft_set_destroy(nft_trans_set(trans)); | |
6091 | break; | |
61edafbb | 6092 | case NFT_MSG_DELSETELEM: |
3453c927 PNA |
6093 | nf_tables_set_elem_destroy(&trans->ctx, |
6094 | nft_trans_elem_set(trans), | |
59105446 | 6095 | nft_trans_elem(trans).priv); |
61edafbb | 6096 | break; |
e5009240 | 6097 | case NFT_MSG_DELOBJ: |
00bfb320 | 6098 | nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); |
e5009240 | 6099 | break; |
3b49e2e9 PNA |
6100 | case NFT_MSG_DELFLOWTABLE: |
6101 | nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); | |
6102 | break; | |
c7c32e72 PNA |
6103 | } |
6104 | kfree(trans); | |
6105 | } | |
6106 | ||
2f99aa31 FW |
6107 | static void nf_tables_commit_release(struct net *net) |
6108 | { | |
6109 | struct nft_trans *trans, *next; | |
6110 | ||
6111 | if (list_empty(&net->nft.commit_list)) | |
6112 | return; | |
6113 | ||
6114 | synchronize_rcu(); | |
6115 | ||
6116 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
6117 | list_del(&trans->list); | |
6118 | nft_commit_release(trans); | |
6119 | } | |
6120 | } | |
6121 | ||
0cbc06b3 FW |
6122 | static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain) |
6123 | { | |
6124 | struct nft_rule *rule; | |
6125 | unsigned int alloc = 0; | |
6126 | int i; | |
6127 | ||
6128 | /* already handled or inactive chain? */ | |
6129 | if (chain->rules_next || !nft_is_active_next(net, chain)) | |
6130 | return 0; | |
6131 | ||
6132 | rule = list_entry(&chain->rules, struct nft_rule, list); | |
6133 | i = 0; | |
6134 | ||
6135 | list_for_each_entry_continue(rule, &chain->rules, list) { | |
6136 | if (nft_is_active_next(net, rule)) | |
6137 | alloc++; | |
6138 | } | |
6139 | ||
6140 | chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc); | |
6141 | if (!chain->rules_next) | |
6142 | return -ENOMEM; | |
6143 | ||
6144 | list_for_each_entry_continue(rule, &chain->rules, list) { | |
6145 | if (nft_is_active_next(net, rule)) | |
6146 | chain->rules_next[i++] = rule; | |
6147 | } | |
6148 | ||
6149 | chain->rules_next[i] = NULL; | |
6150 | return 0; | |
6151 | } | |
6152 | ||
6153 | static void nf_tables_commit_chain_prepare_cancel(struct net *net) | |
6154 | { | |
6155 | struct nft_trans *trans, *next; | |
6156 | ||
6157 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
6158 | struct nft_chain *chain = trans->ctx.chain; | |
6159 | ||
6160 | if (trans->msg_type == NFT_MSG_NEWRULE || | |
6161 | trans->msg_type == NFT_MSG_DELRULE) { | |
6162 | kvfree(chain->rules_next); | |
6163 | chain->rules_next = NULL; | |
6164 | } | |
6165 | } | |
6166 | } | |
6167 | ||
6168 | static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h) | |
6169 | { | |
6170 | struct nft_rules_old *o = container_of(h, struct nft_rules_old, h); | |
6171 | ||
6172 | kvfree(o->start); | |
6173 | } | |
6174 | ||
6175 | static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules) | |
6176 | { | |
6177 | struct nft_rule **r = rules; | |
6178 | struct nft_rules_old *old; | |
6179 | ||
6180 | while (*r) | |
6181 | r++; | |
6182 | ||
6183 | r++; /* rcu_head is after end marker */ | |
6184 | old = (void *) r; | |
6185 | old->start = rules; | |
6186 | ||
6187 | call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old); | |
6188 | } | |
6189 | ||
6190 | static void nf_tables_commit_chain_active(struct net *net, struct nft_chain *chain) | |
6191 | { | |
6192 | struct nft_rule **g0, **g1; | |
6193 | bool next_genbit; | |
6194 | ||
6195 | next_genbit = nft_gencursor_next(net); | |
6196 | ||
6197 | g0 = rcu_dereference_protected(chain->rules_gen_0, | |
6198 | lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES)); | |
6199 | g1 = rcu_dereference_protected(chain->rules_gen_1, | |
6200 | lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES)); | |
6201 | ||
6202 | /* No changes to this chain? */ | |
6203 | if (chain->rules_next == NULL) { | |
6204 | /* chain had no change in last or next generation */ | |
6205 | if (g0 == g1) | |
6206 | return; | |
6207 | /* | |
6208 | * chain had no change in this generation; make sure next | |
6209 | * one uses same rules as current generation. | |
6210 | */ | |
6211 | if (next_genbit) { | |
6212 | rcu_assign_pointer(chain->rules_gen_1, g0); | |
6213 | nf_tables_commit_chain_free_rules_old(g1); | |
6214 | } else { | |
6215 | rcu_assign_pointer(chain->rules_gen_0, g1); | |
6216 | nf_tables_commit_chain_free_rules_old(g0); | |
6217 | } | |
6218 | ||
6219 | return; | |
6220 | } | |
6221 | ||
6222 | if (next_genbit) | |
6223 | rcu_assign_pointer(chain->rules_gen_1, chain->rules_next); | |
6224 | else | |
6225 | rcu_assign_pointer(chain->rules_gen_0, chain->rules_next); | |
6226 | ||
6227 | chain->rules_next = NULL; | |
6228 | ||
6229 | if (g0 == g1) | |
6230 | return; | |
6231 | ||
6232 | if (next_genbit) | |
6233 | nf_tables_commit_chain_free_rules_old(g1); | |
6234 | else | |
6235 | nf_tables_commit_chain_free_rules_old(g0); | |
6236 | } | |
6237 | ||
1b2470e5 FW |
6238 | static void nft_chain_del(struct nft_chain *chain) |
6239 | { | |
6240 | struct nft_table *table = chain->table; | |
6241 | ||
6242 | WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead, | |
6243 | nft_chain_ht_params)); | |
6244 | list_del_rcu(&chain->list); | |
6245 | } | |
6246 | ||
5913beaf | 6247 | static int nf_tables_commit(struct net *net, struct sk_buff *skb) |
37082f93 | 6248 | { |
37082f93 | 6249 | struct nft_trans *trans, *next; |
a3716e70 | 6250 | struct nft_trans_elem *te; |
0cbc06b3 FW |
6251 | struct nft_chain *chain; |
6252 | struct nft_table *table; | |
37082f93 | 6253 | |
a654de8f PNA |
6254 | /* 0. Validate ruleset, otherwise roll back for error reporting. */ |
6255 | if (nf_tables_validate(net) < 0) | |
6256 | return -EAGAIN; | |
6257 | ||
0cbc06b3 FW |
6258 | /* 1. Allocate space for next generation rules_gen_X[] */ |
6259 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
6260 | int ret; | |
37082f93 | 6261 | |
0cbc06b3 FW |
6262 | if (trans->msg_type == NFT_MSG_NEWRULE || |
6263 | trans->msg_type == NFT_MSG_DELRULE) { | |
6264 | chain = trans->ctx.chain; | |
6265 | ||
6266 | ret = nf_tables_commit_chain_prepare(net, chain); | |
6267 | if (ret < 0) { | |
6268 | nf_tables_commit_chain_prepare_cancel(net); | |
6269 | return ret; | |
6270 | } | |
6271 | } | |
6272 | } | |
37082f93 | 6273 | |
0cbc06b3 FW |
6274 | /* step 2. Make rules_gen_X visible to packet path */ |
6275 | list_for_each_entry(table, &net->nft.tables, list) { | |
6276 | list_for_each_entry(chain, &table->chains, list) { | |
6277 | if (!nft_is_active_next(net, chain)) | |
6278 | continue; | |
6279 | nf_tables_commit_chain_active(net, chain); | |
6280 | } | |
6281 | } | |
6282 | ||
6283 | /* | |
6284 | * Bump generation counter, invalidate any dump in progress. | |
6285 | * Cannot fail after this point. | |
37082f93 | 6286 | */ |
0cbc06b3 FW |
6287 | while (++net->nft.base_seq == 0); |
6288 | ||
6289 | /* step 3. Start new generation, rules_gen_X now in use. */ | |
6290 | net->nft.gencursor = nft_gencursor_next(net); | |
37082f93 PNA |
6291 | |
6292 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 6293 | switch (trans->msg_type) { |
55dd6f93 PNA |
6294 | case NFT_MSG_NEWTABLE: |
6295 | if (nft_trans_table_update(trans)) { | |
6296 | if (!nft_trans_table_enable(trans)) { | |
664b0f8c | 6297 | nf_tables_table_disable(net, |
55dd6f93 PNA |
6298 | trans->ctx.table); |
6299 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
6300 | } | |
6301 | } else { | |
f2a6d766 | 6302 | nft_clear(net, trans->ctx.table); |
55dd6f93 | 6303 | } |
35151d84 | 6304 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
6305 | nft_trans_destroy(trans); |
6306 | break; | |
6307 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 6308 | list_del_rcu(&trans->ctx.table->list); |
35151d84 | 6309 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 6310 | break; |
91c7b38d PNA |
6311 | case NFT_MSG_NEWCHAIN: |
6312 | if (nft_trans_chain_update(trans)) | |
6313 | nft_chain_commit_update(trans); | |
4fefee57 | 6314 | else |
664b0f8c | 6315 | nft_clear(net, trans->ctx.chain); |
4fefee57 | 6316 | |
35151d84 | 6317 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
6318 | nft_trans_destroy(trans); |
6319 | break; | |
6320 | case NFT_MSG_DELCHAIN: | |
1b2470e5 | 6321 | nft_chain_del(trans->ctx.chain); |
35151d84 | 6322 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
c974a3a3 PNA |
6323 | nf_tables_unregister_hook(trans->ctx.net, |
6324 | trans->ctx.table, | |
6325 | trans->ctx.chain); | |
91c7b38d | 6326 | break; |
b380e5c7 | 6327 | case NFT_MSG_NEWRULE: |
889f7ee7 | 6328 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
35151d84 | 6329 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 6330 | nft_trans_rule(trans), |
35151d84 | 6331 | NFT_MSG_NEWRULE); |
37082f93 | 6332 | nft_trans_destroy(trans); |
b380e5c7 PNA |
6333 | break; |
6334 | case NFT_MSG_DELRULE: | |
6335 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
6336 | nf_tables_rule_notify(&trans->ctx, |
6337 | nft_trans_rule(trans), | |
6338 | NFT_MSG_DELRULE); | |
b380e5c7 | 6339 | break; |
958bee14 | 6340 | case NFT_MSG_NEWSET: |
37a9cc52 | 6341 | nft_clear(net, nft_trans_set(trans)); |
4fefee57 PNA |
6342 | /* This avoids hitting -EBUSY when deleting the table |
6343 | * from the transaction. | |
6344 | */ | |
408070d6 | 6345 | if (nft_set_is_anonymous(nft_trans_set(trans)) && |
4fefee57 PNA |
6346 | !list_empty(&nft_trans_set(trans)->bindings)) |
6347 | trans->ctx.table->use--; | |
6348 | ||
958bee14 | 6349 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 6350 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
6351 | nft_trans_destroy(trans); |
6352 | break; | |
6353 | case NFT_MSG_DELSET: | |
37a9cc52 | 6354 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 | 6355 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 6356 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 6357 | break; |
60319eb1 | 6358 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
6359 | te = (struct nft_trans_elem *)trans->data; |
6360 | ||
42a55769 | 6361 | te->set->ops->activate(net, te->set, &te->elem); |
cc02e457 PM |
6362 | nf_tables_setelem_notify(&trans->ctx, te->set, |
6363 | &te->elem, | |
60319eb1 PNA |
6364 | NFT_MSG_NEWSETELEM, 0); |
6365 | nft_trans_destroy(trans); | |
6366 | break; | |
6367 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 6368 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 6369 | |
a3716e70 PNA |
6370 | nf_tables_setelem_notify(&trans->ctx, te->set, |
6371 | &te->elem, | |
60319eb1 | 6372 | NFT_MSG_DELSETELEM, 0); |
5cb82a38 | 6373 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a PM |
6374 | atomic_dec(&te->set->nelems); |
6375 | te->set->ndeact--; | |
60319eb1 | 6376 | break; |
e5009240 PNA |
6377 | case NFT_MSG_NEWOBJ: |
6378 | nft_clear(net, nft_trans_obj(trans)); | |
6379 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
6380 | NFT_MSG_NEWOBJ); | |
6381 | nft_trans_destroy(trans); | |
6382 | break; | |
6383 | case NFT_MSG_DELOBJ: | |
6384 | list_del_rcu(&nft_trans_obj(trans)->list); | |
6385 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
6386 | NFT_MSG_DELOBJ); | |
6387 | break; | |
3b49e2e9 PNA |
6388 | case NFT_MSG_NEWFLOWTABLE: |
6389 | nft_clear(net, nft_trans_flowtable(trans)); | |
6390 | nf_tables_flowtable_notify(&trans->ctx, | |
6391 | nft_trans_flowtable(trans), | |
6392 | NFT_MSG_NEWFLOWTABLE); | |
6393 | nft_trans_destroy(trans); | |
6394 | break; | |
6395 | case NFT_MSG_DELFLOWTABLE: | |
6396 | list_del_rcu(&nft_trans_flowtable(trans)->list); | |
6397 | nf_tables_flowtable_notify(&trans->ctx, | |
6398 | nft_trans_flowtable(trans), | |
6399 | NFT_MSG_DELFLOWTABLE); | |
6400 | nft_unregister_flowtable_net_hooks(net, | |
6401 | nft_trans_flowtable(trans)); | |
6402 | break; | |
37082f93 | 6403 | } |
37082f93 PNA |
6404 | } |
6405 | ||
2f99aa31 | 6406 | nf_tables_commit_release(net); |
84d7fce6 | 6407 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); |
37082f93 PNA |
6408 | |
6409 | return 0; | |
6410 | } | |
6411 | ||
b326dd37 | 6412 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 6413 | { |
c7c32e72 PNA |
6414 | switch (trans->msg_type) { |
6415 | case NFT_MSG_NEWTABLE: | |
6416 | nf_tables_table_destroy(&trans->ctx); | |
6417 | break; | |
6418 | case NFT_MSG_NEWCHAIN: | |
43a605f2 | 6419 | nf_tables_chain_destroy(&trans->ctx); |
c7c32e72 PNA |
6420 | break; |
6421 | case NFT_MSG_NEWRULE: | |
6422 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
6423 | break; | |
6424 | case NFT_MSG_NEWSET: | |
6425 | nft_set_destroy(nft_trans_set(trans)); | |
6426 | break; | |
61edafbb PM |
6427 | case NFT_MSG_NEWSETELEM: |
6428 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 6429 | nft_trans_elem(trans).priv, true); |
61edafbb | 6430 | break; |
e5009240 | 6431 | case NFT_MSG_NEWOBJ: |
00bfb320 | 6432 | nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); |
e5009240 | 6433 | break; |
3b49e2e9 PNA |
6434 | case NFT_MSG_NEWFLOWTABLE: |
6435 | nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); | |
6436 | break; | |
c7c32e72 PNA |
6437 | } |
6438 | kfree(trans); | |
6439 | } | |
6440 | ||
5913beaf | 6441 | static int nf_tables_abort(struct net *net, struct sk_buff *skb) |
37082f93 | 6442 | { |
37082f93 | 6443 | struct nft_trans *trans, *next; |
02263db0 | 6444 | struct nft_trans_elem *te; |
37082f93 | 6445 | |
a907e36d XL |
6446 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
6447 | list) { | |
b380e5c7 | 6448 | switch (trans->msg_type) { |
55dd6f93 PNA |
6449 | case NFT_MSG_NEWTABLE: |
6450 | if (nft_trans_table_update(trans)) { | |
6451 | if (nft_trans_table_enable(trans)) { | |
664b0f8c | 6452 | nf_tables_table_disable(net, |
55dd6f93 PNA |
6453 | trans->ctx.table); |
6454 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
6455 | } | |
6456 | nft_trans_destroy(trans); | |
6457 | } else { | |
e688a7f8 | 6458 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
6459 | } |
6460 | break; | |
6461 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 6462 | nft_clear(trans->ctx.net, trans->ctx.table); |
55dd6f93 PNA |
6463 | nft_trans_destroy(trans); |
6464 | break; | |
91c7b38d PNA |
6465 | case NFT_MSG_NEWCHAIN: |
6466 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 6467 | free_percpu(nft_trans_chain_stats(trans)); |
91c7b38d PNA |
6468 | |
6469 | nft_trans_destroy(trans); | |
6470 | } else { | |
4fefee57 | 6471 | trans->ctx.table->use--; |
1b2470e5 | 6472 | nft_chain_del(trans->ctx.chain); |
c974a3a3 PNA |
6473 | nf_tables_unregister_hook(trans->ctx.net, |
6474 | trans->ctx.table, | |
6475 | trans->ctx.chain); | |
91c7b38d PNA |
6476 | } |
6477 | break; | |
6478 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 6479 | trans->ctx.table->use++; |
664b0f8c | 6480 | nft_clear(trans->ctx.net, trans->ctx.chain); |
91c7b38d PNA |
6481 | nft_trans_destroy(trans); |
6482 | break; | |
b380e5c7 | 6483 | case NFT_MSG_NEWRULE: |
4fefee57 | 6484 | trans->ctx.chain->use--; |
b380e5c7 | 6485 | list_del_rcu(&nft_trans_rule(trans)->list); |
bb7b40ae | 6486 | nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans)); |
b380e5c7 PNA |
6487 | break; |
6488 | case NFT_MSG_DELRULE: | |
4fefee57 | 6489 | trans->ctx.chain->use++; |
889f7ee7 | 6490 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
bb7b40ae | 6491 | nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans)); |
37082f93 | 6492 | nft_trans_destroy(trans); |
b380e5c7 | 6493 | break; |
958bee14 | 6494 | case NFT_MSG_NEWSET: |
4fefee57 | 6495 | trans->ctx.table->use--; |
e688a7f8 | 6496 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
6497 | break; |
6498 | case NFT_MSG_DELSET: | |
4fefee57 | 6499 | trans->ctx.table->use++; |
37a9cc52 | 6500 | nft_clear(trans->ctx.net, nft_trans_set(trans)); |
958bee14 PNA |
6501 | nft_trans_destroy(trans); |
6502 | break; | |
60319eb1 | 6503 | case NFT_MSG_NEWSETELEM: |
02263db0 | 6504 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 6505 | |
5cb82a38 | 6506 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a | 6507 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
6508 | break; |
6509 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
6510 | te = (struct nft_trans_elem *)trans->data; |
6511 | ||
59105446 | 6512 | nft_set_elem_activate(net, te->set, &te->elem); |
42a55769 | 6513 | te->set->ops->activate(net, te->set, &te->elem); |
3dd0673a | 6514 | te->set->ndeact--; |
cc02e457 | 6515 | |
e5009240 PNA |
6516 | nft_trans_destroy(trans); |
6517 | break; | |
6518 | case NFT_MSG_NEWOBJ: | |
6519 | trans->ctx.table->use--; | |
6520 | list_del_rcu(&nft_trans_obj(trans)->list); | |
6521 | break; | |
6522 | case NFT_MSG_DELOBJ: | |
6523 | trans->ctx.table->use++; | |
6524 | nft_clear(trans->ctx.net, nft_trans_obj(trans)); | |
60319eb1 PNA |
6525 | nft_trans_destroy(trans); |
6526 | break; | |
3b49e2e9 PNA |
6527 | case NFT_MSG_NEWFLOWTABLE: |
6528 | trans->ctx.table->use--; | |
6529 | list_del_rcu(&nft_trans_flowtable(trans)->list); | |
6530 | nft_unregister_flowtable_net_hooks(net, | |
6531 | nft_trans_flowtable(trans)); | |
6532 | break; | |
6533 | case NFT_MSG_DELFLOWTABLE: | |
6534 | trans->ctx.table->use++; | |
6535 | nft_clear(trans->ctx.net, nft_trans_flowtable(trans)); | |
6536 | nft_trans_destroy(trans); | |
6537 | break; | |
37082f93 | 6538 | } |
37082f93 PNA |
6539 | } |
6540 | ||
b326dd37 PNA |
6541 | synchronize_rcu(); |
6542 | ||
a1cee076 PNA |
6543 | list_for_each_entry_safe_reverse(trans, next, |
6544 | &net->nft.commit_list, list) { | |
c7c32e72 | 6545 | list_del(&trans->list); |
b326dd37 | 6546 | nf_tables_abort_release(trans); |
37082f93 PNA |
6547 | } |
6548 | ||
6549 | return 0; | |
6550 | } | |
6551 | ||
a654de8f PNA |
6552 | static void nf_tables_cleanup(struct net *net) |
6553 | { | |
6554 | nft_validate_state_update(net, NFT_VALIDATE_SKIP); | |
6555 | } | |
6556 | ||
74e8bcd2 PNA |
6557 | static bool nf_tables_valid_genid(struct net *net, u32 genid) |
6558 | { | |
6559 | return net->nft.base_seq == genid; | |
6560 | } | |
6561 | ||
96518518 PM |
6562 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
6563 | .name = "nf_tables", | |
6564 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
6565 | .cb_count = NFT_MSG_MAX, | |
6566 | .cb = nf_tables_cb, | |
0628b123 PNA |
6567 | .commit = nf_tables_commit, |
6568 | .abort = nf_tables_abort, | |
a654de8f | 6569 | .cleanup = nf_tables_cleanup, |
74e8bcd2 | 6570 | .valid_genid = nf_tables_valid_genid, |
96518518 PM |
6571 | }; |
6572 | ||
7210e4e3 | 6573 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
32537e91 | 6574 | enum nft_chain_types type) |
7210e4e3 PNA |
6575 | { |
6576 | const struct nft_base_chain *basechain; | |
6577 | ||
f323d954 | 6578 | if (nft_is_base_chain(chain)) { |
7210e4e3 PNA |
6579 | basechain = nft_base_chain(chain); |
6580 | if (basechain->type->type != type) | |
6581 | return -EOPNOTSUPP; | |
6582 | } | |
6583 | return 0; | |
6584 | } | |
6585 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
6586 | ||
75e8d06d PNA |
6587 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
6588 | unsigned int hook_flags) | |
6589 | { | |
6590 | struct nft_base_chain *basechain; | |
6591 | ||
f323d954 | 6592 | if (nft_is_base_chain(chain)) { |
75e8d06d PNA |
6593 | basechain = nft_base_chain(chain); |
6594 | ||
c974a3a3 | 6595 | if ((1 << basechain->ops.hooknum) & hook_flags) |
75e8d06d PNA |
6596 | return 0; |
6597 | ||
6598 | return -EOPNOTSUPP; | |
6599 | } | |
6600 | ||
6601 | return 0; | |
6602 | } | |
6603 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
6604 | ||
20a69341 PM |
6605 | /* |
6606 | * Loop detection - walk through the ruleset beginning at the destination chain | |
6607 | * of a new jump until either the source chain is reached (loop) or all | |
6608 | * reachable chains have been traversed. | |
6609 | * | |
6610 | * The loop check is performed whenever a new jump verdict is added to an | |
6611 | * expression or verdict map or a verdict map is bound to a new chain. | |
6612 | */ | |
6613 | ||
6614 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
6615 | const struct nft_chain *chain); | |
6616 | ||
6617 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 6618 | struct nft_set *set, |
20a69341 | 6619 | const struct nft_set_iter *iter, |
de70185d | 6620 | struct nft_set_elem *elem) |
20a69341 | 6621 | { |
fe2811eb PM |
6622 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
6623 | const struct nft_data *data; | |
6624 | ||
6625 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
6626 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
6627 | return 0; |
6628 | ||
fe2811eb | 6629 | data = nft_set_ext_data(ext); |
1ca2e170 | 6630 | switch (data->verdict.code) { |
20a69341 PM |
6631 | case NFT_JUMP: |
6632 | case NFT_GOTO: | |
1ca2e170 | 6633 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
6634 | default: |
6635 | return 0; | |
6636 | } | |
6637 | } | |
6638 | ||
6639 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
6640 | const struct nft_chain *chain) | |
6641 | { | |
6642 | const struct nft_rule *rule; | |
6643 | const struct nft_expr *expr, *last; | |
de70185d | 6644 | struct nft_set *set; |
20a69341 PM |
6645 | struct nft_set_binding *binding; |
6646 | struct nft_set_iter iter; | |
20a69341 PM |
6647 | |
6648 | if (ctx->chain == chain) | |
6649 | return -ELOOP; | |
6650 | ||
6651 | list_for_each_entry(rule, &chain->rules, list) { | |
6652 | nft_rule_for_each_expr(expr, last, rule) { | |
a654de8f PNA |
6653 | struct nft_immediate_expr *priv; |
6654 | const struct nft_data *data; | |
0ca743a5 PNA |
6655 | int err; |
6656 | ||
a654de8f | 6657 | if (strcmp(expr->ops->type->name, "immediate")) |
20a69341 PM |
6658 | continue; |
6659 | ||
a654de8f PNA |
6660 | priv = nft_expr_priv(expr); |
6661 | if (priv->dreg != NFT_REG_VERDICT) | |
0ca743a5 | 6662 | continue; |
20a69341 | 6663 | |
a654de8f | 6664 | data = &priv->data; |
1ca2e170 | 6665 | switch (data->verdict.code) { |
20a69341 PM |
6666 | case NFT_JUMP: |
6667 | case NFT_GOTO: | |
1ca2e170 PM |
6668 | err = nf_tables_check_loops(ctx, |
6669 | data->verdict.chain); | |
20a69341 PM |
6670 | if (err < 0) |
6671 | return err; | |
6672 | default: | |
6673 | break; | |
6674 | } | |
6675 | } | |
6676 | } | |
6677 | ||
6678 | list_for_each_entry(set, &ctx->table->sets, list) { | |
37a9cc52 PNA |
6679 | if (!nft_is_active_next(ctx->net, set)) |
6680 | continue; | |
20a69341 PM |
6681 | if (!(set->flags & NFT_SET_MAP) || |
6682 | set->dtype != NFT_DATA_VERDICT) | |
6683 | continue; | |
6684 | ||
6685 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
6686 | if (!(binding->flags & NFT_SET_MAP) || |
6687 | binding->chain != chain) | |
20a69341 PM |
6688 | continue; |
6689 | ||
8588ac09 | 6690 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
6691 | iter.skip = 0; |
6692 | iter.count = 0; | |
6693 | iter.err = 0; | |
6694 | iter.fn = nf_tables_loop_check_setelem; | |
6695 | ||
6696 | set->ops->walk(ctx, set, &iter); | |
6697 | if (iter.err < 0) | |
6698 | return iter.err; | |
6699 | } | |
6700 | } | |
6701 | ||
6702 | return 0; | |
6703 | } | |
6704 | ||
36b701fa LGL |
6705 | /** |
6706 | * nft_parse_u32_check - fetch u32 attribute and check for maximum value | |
6707 | * | |
6708 | * @attr: netlink attribute to fetch value from | |
6709 | * @max: maximum value to be stored in dest | |
6710 | * @dest: pointer to the variable | |
6711 | * | |
6712 | * Parse, check and store a given u32 netlink attribute into variable. | |
6713 | * This function returns -ERANGE if the value goes over maximum value. | |
6714 | * Otherwise a 0 is returned and the attribute value is stored in the | |
6715 | * destination variable. | |
6716 | */ | |
f1d505bb | 6717 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) |
36b701fa | 6718 | { |
09525a09 | 6719 | u32 val; |
36b701fa LGL |
6720 | |
6721 | val = ntohl(nla_get_be32(attr)); | |
6722 | if (val > max) | |
6723 | return -ERANGE; | |
6724 | ||
6725 | *dest = val; | |
6726 | return 0; | |
6727 | } | |
6728 | EXPORT_SYMBOL_GPL(nft_parse_u32_check); | |
6729 | ||
49499c3e PM |
6730 | /** |
6731 | * nft_parse_register - parse a register value from a netlink attribute | |
6732 | * | |
6733 | * @attr: netlink attribute | |
6734 | * | |
6735 | * Parse and translate a register value from a netlink attribute. | |
6736 | * Registers used to be 128 bit wide, these register numbers will be | |
6737 | * mapped to the corresponding 32 bit register numbers. | |
6738 | */ | |
b1c96ed3 PM |
6739 | unsigned int nft_parse_register(const struct nlattr *attr) |
6740 | { | |
49499c3e PM |
6741 | unsigned int reg; |
6742 | ||
6743 | reg = ntohl(nla_get_be32(attr)); | |
6744 | switch (reg) { | |
6745 | case NFT_REG_VERDICT...NFT_REG_4: | |
6746 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
6747 | default: | |
6748 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
6749 | } | |
b1c96ed3 PM |
6750 | } |
6751 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
6752 | ||
49499c3e PM |
6753 | /** |
6754 | * nft_dump_register - dump a register value to a netlink attribute | |
6755 | * | |
6756 | * @skb: socket buffer | |
6757 | * @attr: attribute number | |
6758 | * @reg: register number | |
6759 | * | |
6760 | * Construct a netlink attribute containing the register number. For | |
6761 | * compatibility reasons, register numbers being a multiple of 4 are | |
6762 | * translated to the corresponding 128 bit register numbers. | |
6763 | */ | |
b1c96ed3 PM |
6764 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
6765 | { | |
49499c3e PM |
6766 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
6767 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
6768 | else | |
6769 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
6770 | ||
b1c96ed3 PM |
6771 | return nla_put_be32(skb, attr, htonl(reg)); |
6772 | } | |
6773 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
6774 | ||
96518518 | 6775 | /** |
d07db988 | 6776 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
6777 | * |
6778 | * @reg: the register number | |
d07db988 | 6779 | * @len: the length of the data |
96518518 PM |
6780 | * |
6781 | * Validate that the input register is one of the general purpose | |
d07db988 | 6782 | * registers and that the length of the load is within the bounds. |
96518518 | 6783 | */ |
d07db988 | 6784 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 6785 | { |
49499c3e | 6786 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 6787 | return -EINVAL; |
d07db988 PM |
6788 | if (len == 0) |
6789 | return -EINVAL; | |
49499c3e | 6790 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 6791 | return -ERANGE; |
49499c3e | 6792 | |
96518518 PM |
6793 | return 0; |
6794 | } | |
d07db988 | 6795 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 6796 | |
96518518 | 6797 | /** |
1ec10212 | 6798 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
6799 | * |
6800 | * @ctx: context of the expression performing the load | |
6801 | * @reg: the destination register number | |
6802 | * @data: the data to load | |
6803 | * @type: the data type | |
45d9bcda | 6804 | * @len: the length of the data |
96518518 PM |
6805 | * |
6806 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
6807 | * the destination register and the length is within the bounds. |
6808 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 6809 | * data. |
96518518 | 6810 | */ |
1ec10212 PM |
6811 | int nft_validate_register_store(const struct nft_ctx *ctx, |
6812 | enum nft_registers reg, | |
6813 | const struct nft_data *data, | |
6814 | enum nft_data_types type, unsigned int len) | |
96518518 | 6815 | { |
20a69341 PM |
6816 | int err; |
6817 | ||
96518518 PM |
6818 | switch (reg) { |
6819 | case NFT_REG_VERDICT: | |
58f40ab6 | 6820 | if (type != NFT_DATA_VERDICT) |
96518518 | 6821 | return -EINVAL; |
20a69341 | 6822 | |
58f40ab6 | 6823 | if (data != NULL && |
1ca2e170 PM |
6824 | (data->verdict.code == NFT_GOTO || |
6825 | data->verdict.code == NFT_JUMP)) { | |
6826 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
6827 | if (err < 0) |
6828 | return err; | |
6829 | ||
1ca2e170 PM |
6830 | if (ctx->chain->level + 1 > |
6831 | data->verdict.chain->level) { | |
20a69341 PM |
6832 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
6833 | return -EMLINK; | |
1ca2e170 | 6834 | data->verdict.chain->level = ctx->chain->level + 1; |
20a69341 PM |
6835 | } |
6836 | } | |
6837 | ||
96518518 PM |
6838 | return 0; |
6839 | default: | |
49499c3e | 6840 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 6841 | return -EINVAL; |
45d9bcda PM |
6842 | if (len == 0) |
6843 | return -EINVAL; | |
49499c3e PM |
6844 | if (reg * NFT_REG32_SIZE + len > |
6845 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 6846 | return -ERANGE; |
27e6d201 | 6847 | |
96518518 PM |
6848 | if (data != NULL && type != NFT_DATA_VALUE) |
6849 | return -EINVAL; | |
6850 | return 0; | |
6851 | } | |
6852 | } | |
1ec10212 | 6853 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
6854 | |
6855 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
6856 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
6857 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
6858 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
6859 | }; | |
6860 | ||
6861 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
6862 | struct nft_data_desc *desc, const struct nlattr *nla) | |
6863 | { | |
664b0f8c | 6864 | u8 genmask = nft_genmask_next(ctx->net); |
96518518 PM |
6865 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
6866 | struct nft_chain *chain; | |
6867 | int err; | |
6868 | ||
fceb6435 JB |
6869 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy, |
6870 | NULL); | |
96518518 PM |
6871 | if (err < 0) |
6872 | return err; | |
6873 | ||
6874 | if (!tb[NFTA_VERDICT_CODE]) | |
6875 | return -EINVAL; | |
1ca2e170 | 6876 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 6877 | |
1ca2e170 | 6878 | switch (data->verdict.code) { |
e0abdadc | 6879 | default: |
1ca2e170 | 6880 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
6881 | case NF_ACCEPT: |
6882 | case NF_DROP: | |
6883 | case NF_QUEUE: | |
6884 | break; | |
6885 | default: | |
6886 | return -EINVAL; | |
6887 | } | |
6888 | /* fall through */ | |
96518518 PM |
6889 | case NFT_CONTINUE: |
6890 | case NFT_BREAK: | |
6891 | case NFT_RETURN: | |
96518518 PM |
6892 | break; |
6893 | case NFT_JUMP: | |
6894 | case NFT_GOTO: | |
6895 | if (!tb[NFTA_VERDICT_CHAIN]) | |
6896 | return -EINVAL; | |
cac20fcd PNA |
6897 | chain = nft_chain_lookup(ctx->table, tb[NFTA_VERDICT_CHAIN], |
6898 | genmask); | |
96518518 PM |
6899 | if (IS_ERR(chain)) |
6900 | return PTR_ERR(chain); | |
f323d954 | 6901 | if (nft_is_base_chain(chain)) |
96518518 PM |
6902 | return -EOPNOTSUPP; |
6903 | ||
96518518 | 6904 | chain->use++; |
1ca2e170 | 6905 | data->verdict.chain = chain; |
96518518 | 6906 | break; |
96518518 PM |
6907 | } |
6908 | ||
4c4ed074 | 6909 | desc->len = sizeof(data->verdict); |
96518518 PM |
6910 | desc->type = NFT_DATA_VERDICT; |
6911 | return 0; | |
6912 | } | |
6913 | ||
6914 | static void nft_verdict_uninit(const struct nft_data *data) | |
6915 | { | |
1ca2e170 | 6916 | switch (data->verdict.code) { |
96518518 PM |
6917 | case NFT_JUMP: |
6918 | case NFT_GOTO: | |
1ca2e170 | 6919 | data->verdict.chain->use--; |
96518518 PM |
6920 | break; |
6921 | } | |
6922 | } | |
6923 | ||
33d5a7b1 | 6924 | int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) |
96518518 PM |
6925 | { |
6926 | struct nlattr *nest; | |
6927 | ||
33d5a7b1 | 6928 | nest = nla_nest_start(skb, type); |
96518518 PM |
6929 | if (!nest) |
6930 | goto nla_put_failure; | |
6931 | ||
33d5a7b1 | 6932 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) |
96518518 PM |
6933 | goto nla_put_failure; |
6934 | ||
33d5a7b1 | 6935 | switch (v->code) { |
96518518 PM |
6936 | case NFT_JUMP: |
6937 | case NFT_GOTO: | |
1ca2e170 | 6938 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
33d5a7b1 | 6939 | v->chain->name)) |
96518518 PM |
6940 | goto nla_put_failure; |
6941 | } | |
6942 | nla_nest_end(skb, nest); | |
6943 | return 0; | |
6944 | ||
6945 | nla_put_failure: | |
6946 | return -1; | |
6947 | } | |
6948 | ||
d0a11fc3 PM |
6949 | static int nft_value_init(const struct nft_ctx *ctx, |
6950 | struct nft_data *data, unsigned int size, | |
96518518 PM |
6951 | struct nft_data_desc *desc, const struct nlattr *nla) |
6952 | { | |
6953 | unsigned int len; | |
6954 | ||
6955 | len = nla_len(nla); | |
6956 | if (len == 0) | |
6957 | return -EINVAL; | |
d0a11fc3 | 6958 | if (len > size) |
96518518 PM |
6959 | return -EOVERFLOW; |
6960 | ||
d0a11fc3 | 6961 | nla_memcpy(data->data, nla, len); |
96518518 PM |
6962 | desc->type = NFT_DATA_VALUE; |
6963 | desc->len = len; | |
6964 | return 0; | |
6965 | } | |
6966 | ||
6967 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
6968 | unsigned int len) | |
6969 | { | |
6970 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
6971 | } | |
6972 | ||
6973 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 6974 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
6975 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
6976 | }; | |
6977 | ||
6978 | /** | |
6979 | * nft_data_init - parse nf_tables data netlink attributes | |
6980 | * | |
6981 | * @ctx: context of the expression using the data | |
6982 | * @data: destination struct nft_data | |
d0a11fc3 | 6983 | * @size: maximum data length |
96518518 PM |
6984 | * @desc: data description |
6985 | * @nla: netlink attribute containing data | |
6986 | * | |
6987 | * Parse the netlink data attributes and initialize a struct nft_data. | |
6988 | * The type and length of data are returned in the data description. | |
6989 | * | |
6990 | * The caller can indicate that it only wants to accept data of type | |
6991 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
6992 | */ | |
d0a11fc3 PM |
6993 | int nft_data_init(const struct nft_ctx *ctx, |
6994 | struct nft_data *data, unsigned int size, | |
96518518 PM |
6995 | struct nft_data_desc *desc, const struct nlattr *nla) |
6996 | { | |
6997 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
6998 | int err; | |
6999 | ||
fceb6435 | 7000 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL); |
96518518 PM |
7001 | if (err < 0) |
7002 | return err; | |
7003 | ||
7004 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
7005 | return nft_value_init(ctx, data, size, desc, |
7006 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
7007 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
7008 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
7009 | return -EINVAL; | |
7010 | } | |
7011 | EXPORT_SYMBOL_GPL(nft_data_init); | |
7012 | ||
7013 | /** | |
59105446 | 7014 | * nft_data_release - release a nft_data item |
96518518 PM |
7015 | * |
7016 | * @data: struct nft_data to release | |
7017 | * @type: type of data | |
7018 | * | |
7019 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
7020 | * all others need to be released by calling this function. | |
7021 | */ | |
59105446 | 7022 | void nft_data_release(const struct nft_data *data, enum nft_data_types type) |
96518518 | 7023 | { |
960bd2c2 | 7024 | if (type < NFT_DATA_VERDICT) |
96518518 | 7025 | return; |
960bd2c2 | 7026 | switch (type) { |
96518518 PM |
7027 | case NFT_DATA_VERDICT: |
7028 | return nft_verdict_uninit(data); | |
7029 | default: | |
7030 | WARN_ON(1); | |
7031 | } | |
7032 | } | |
59105446 | 7033 | EXPORT_SYMBOL_GPL(nft_data_release); |
96518518 PM |
7034 | |
7035 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
7036 | enum nft_data_types type, unsigned int len) | |
7037 | { | |
7038 | struct nlattr *nest; | |
7039 | int err; | |
7040 | ||
7041 | nest = nla_nest_start(skb, attr); | |
7042 | if (nest == NULL) | |
7043 | return -1; | |
7044 | ||
7045 | switch (type) { | |
7046 | case NFT_DATA_VALUE: | |
7047 | err = nft_value_dump(skb, data, len); | |
7048 | break; | |
7049 | case NFT_DATA_VERDICT: | |
33d5a7b1 | 7050 | err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); |
96518518 PM |
7051 | break; |
7052 | default: | |
7053 | err = -EINVAL; | |
7054 | WARN_ON(1); | |
7055 | } | |
7056 | ||
7057 | nla_nest_end(skb, nest); | |
7058 | return err; | |
7059 | } | |
7060 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
7061 | ||
5ebe0b0e PNA |
7062 | int __nft_release_basechain(struct nft_ctx *ctx) |
7063 | { | |
7064 | struct nft_rule *rule, *nr; | |
7065 | ||
f323d954 | 7066 | BUG_ON(!nft_is_base_chain(ctx->chain)); |
5ebe0b0e | 7067 | |
c974a3a3 | 7068 | nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain); |
5ebe0b0e PNA |
7069 | list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { |
7070 | list_del(&rule->list); | |
7071 | ctx->chain->use--; | |
bb7b40ae | 7072 | nf_tables_rule_release(ctx, rule); |
5ebe0b0e | 7073 | } |
1b2470e5 | 7074 | nft_chain_del(ctx->chain); |
5ebe0b0e | 7075 | ctx->table->use--; |
43a605f2 | 7076 | nf_tables_chain_destroy(ctx); |
5ebe0b0e PNA |
7077 | |
7078 | return 0; | |
7079 | } | |
7080 | EXPORT_SYMBOL_GPL(__nft_release_basechain); | |
7081 | ||
98319cb9 | 7082 | static void __nft_release_tables(struct net *net) |
df05ef87 | 7083 | { |
3b49e2e9 | 7084 | struct nft_flowtable *flowtable, *nf; |
df05ef87 PNA |
7085 | struct nft_table *table, *nt; |
7086 | struct nft_chain *chain, *nc; | |
e5009240 | 7087 | struct nft_object *obj, *ne; |
df05ef87 PNA |
7088 | struct nft_rule *rule, *nr; |
7089 | struct nft_set *set, *ns; | |
7090 | struct nft_ctx ctx = { | |
7091 | .net = net, | |
43a605f2 | 7092 | .family = NFPROTO_NETDEV, |
df05ef87 PNA |
7093 | }; |
7094 | ||
36596dad | 7095 | list_for_each_entry_safe(table, nt, &net->nft.tables, list) { |
98319cb9 | 7096 | ctx.family = table->family; |
dd4cbef7 | 7097 | |
df05ef87 | 7098 | list_for_each_entry(chain, &table->chains, list) |
c974a3a3 | 7099 | nf_tables_unregister_hook(net, table, chain); |
3b49e2e9 PNA |
7100 | list_for_each_entry(flowtable, &table->flowtables, list) |
7101 | nf_unregister_net_hooks(net, flowtable->ops, | |
7102 | flowtable->ops_len); | |
df05ef87 PNA |
7103 | /* No packets are walking on these chains anymore. */ |
7104 | ctx.table = table; | |
7105 | list_for_each_entry(chain, &table->chains, list) { | |
7106 | ctx.chain = chain; | |
7107 | list_for_each_entry_safe(rule, nr, &chain->rules, list) { | |
7108 | list_del(&rule->list); | |
7109 | chain->use--; | |
bb7b40ae | 7110 | nf_tables_rule_release(&ctx, rule); |
df05ef87 PNA |
7111 | } |
7112 | } | |
3b49e2e9 PNA |
7113 | list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) { |
7114 | list_del(&flowtable->list); | |
7115 | table->use--; | |
7116 | nf_tables_flowtable_destroy(flowtable); | |
7117 | } | |
df05ef87 PNA |
7118 | list_for_each_entry_safe(set, ns, &table->sets, list) { |
7119 | list_del(&set->list); | |
7120 | table->use--; | |
7121 | nft_set_destroy(set); | |
7122 | } | |
e5009240 PNA |
7123 | list_for_each_entry_safe(obj, ne, &table->objects, list) { |
7124 | list_del(&obj->list); | |
7125 | table->use--; | |
00bfb320 | 7126 | nft_obj_destroy(&ctx, obj); |
e5009240 | 7127 | } |
df05ef87 | 7128 | list_for_each_entry_safe(chain, nc, &table->chains, list) { |
43a605f2 | 7129 | ctx.chain = chain; |
1b2470e5 | 7130 | nft_chain_del(chain); |
df05ef87 | 7131 | table->use--; |
43a605f2 | 7132 | nf_tables_chain_destroy(&ctx); |
df05ef87 PNA |
7133 | } |
7134 | list_del(&table->list); | |
7135 | nf_tables_table_destroy(&ctx); | |
7136 | } | |
7137 | } | |
7138 | ||
dd4cbef7 PNA |
7139 | static int __net_init nf_tables_init_net(struct net *net) |
7140 | { | |
7141 | INIT_LIST_HEAD(&net->nft.tables); | |
7142 | INIT_LIST_HEAD(&net->nft.commit_list); | |
7143 | net->nft.base_seq = 1; | |
a654de8f PNA |
7144 | net->nft.validate_state = NFT_VALIDATE_SKIP; |
7145 | ||
dd4cbef7 PNA |
7146 | return 0; |
7147 | } | |
7148 | ||
7149 | static void __net_exit nf_tables_exit_net(struct net *net) | |
7150 | { | |
98319cb9 | 7151 | __nft_release_tables(net); |
dd4cbef7 PNA |
7152 | WARN_ON_ONCE(!list_empty(&net->nft.tables)); |
7153 | WARN_ON_ONCE(!list_empty(&net->nft.commit_list)); | |
7154 | } | |
7155 | ||
99633ab2 PNA |
7156 | static struct pernet_operations nf_tables_net_ops = { |
7157 | .init = nf_tables_init_net, | |
613d0776 | 7158 | .exit = nf_tables_exit_net, |
99633ab2 PNA |
7159 | }; |
7160 | ||
96518518 PM |
7161 | static int __init nf_tables_module_init(void) |
7162 | { | |
7163 | int err; | |
7164 | ||
02c7b25e PNA |
7165 | nft_chain_filter_init(); |
7166 | ||
6da2ec56 KC |
7167 | info = kmalloc_array(NFT_RULE_MAXEXPRS, sizeof(struct nft_expr_info), |
7168 | GFP_KERNEL); | |
96518518 PM |
7169 | if (info == NULL) { |
7170 | err = -ENOMEM; | |
7171 | goto err1; | |
7172 | } | |
7173 | ||
7174 | err = nf_tables_core_module_init(); | |
7175 | if (err < 0) | |
7176 | goto err2; | |
7177 | ||
7178 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
7179 | if (err < 0) | |
7180 | goto err3; | |
7181 | ||
3b49e2e9 PNA |
7182 | register_netdevice_notifier(&nf_tables_flowtable_notifier); |
7183 | ||
99633ab2 | 7184 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
7185 | err3: |
7186 | nf_tables_core_module_exit(); | |
7187 | err2: | |
7188 | kfree(info); | |
7189 | err1: | |
7190 | return err; | |
7191 | } | |
7192 | ||
7193 | static void __exit nf_tables_module_exit(void) | |
7194 | { | |
99633ab2 | 7195 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 | 7196 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
3b49e2e9 | 7197 | unregister_netdevice_notifier(&nf_tables_flowtable_notifier); |
1b1bc49c | 7198 | rcu_barrier(); |
96518518 PM |
7199 | nf_tables_core_module_exit(); |
7200 | kfree(info); | |
02c7b25e | 7201 | nft_chain_filter_fini(); |
96518518 PM |
7202 | } |
7203 | ||
7204 | module_init(nf_tables_module_init); | |
7205 | module_exit(nf_tables_module_exit); | |
7206 | ||
7207 | MODULE_LICENSE("GPL"); | |
7208 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
7209 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |