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> |
0eb71a9d | 17 | #include <linux/rhashtable.h> |
96518518 PM |
18 | #include <linux/netfilter.h> |
19 | #include <linux/netfilter/nfnetlink.h> | |
20 | #include <linux/netfilter/nf_tables.h> | |
3b49e2e9 | 21 | #include <net/netfilter/nf_flow_table.h> |
96518518 PM |
22 | #include <net/netfilter/nf_tables_core.h> |
23 | #include <net/netfilter/nf_tables.h> | |
99633ab2 | 24 | #include <net/net_namespace.h> |
96518518 PM |
25 | #include <net/sock.h> |
26 | ||
96518518 | 27 | static LIST_HEAD(nf_tables_expressions); |
e5009240 | 28 | static LIST_HEAD(nf_tables_objects); |
3b49e2e9 | 29 | static LIST_HEAD(nf_tables_flowtables); |
3ecbfd65 | 30 | static u64 table_handle; |
96518518 | 31 | |
a654de8f PNA |
32 | enum { |
33 | NFT_VALIDATE_SKIP = 0, | |
34 | NFT_VALIDATE_NEED, | |
35 | NFT_VALIDATE_DO, | |
36 | }; | |
37 | ||
1b2470e5 FW |
38 | static u32 nft_chain_hash(const void *data, u32 len, u32 seed); |
39 | static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed); | |
40 | static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *); | |
41 | ||
42 | static const struct rhashtable_params nft_chain_ht_params = { | |
43 | .head_offset = offsetof(struct nft_chain, rhlhead), | |
44 | .key_offset = offsetof(struct nft_chain, name), | |
45 | .hashfn = nft_chain_hash, | |
46 | .obj_hashfn = nft_chain_hash_obj, | |
47 | .obj_cmpfn = nft_chain_hash_cmp, | |
48 | .locks_mul = 1, | |
49 | .automatic_shrinking = true, | |
50 | }; | |
51 | ||
a654de8f PNA |
52 | static void nft_validate_state_update(struct net *net, u8 new_validate_state) |
53 | { | |
54 | switch (net->nft.validate_state) { | |
55 | case NFT_VALIDATE_SKIP: | |
56 | WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO); | |
57 | break; | |
58 | case NFT_VALIDATE_NEED: | |
59 | break; | |
60 | case NFT_VALIDATE_DO: | |
61 | if (new_validate_state == NFT_VALIDATE_NEED) | |
62 | return; | |
63 | } | |
64 | ||
65 | net->nft.validate_state = new_validate_state; | |
66 | } | |
67 | ||
7c95f6d8 | 68 | static void nft_ctx_init(struct nft_ctx *ctx, |
633c9a84 | 69 | struct net *net, |
7c95f6d8 PNA |
70 | const struct sk_buff *skb, |
71 | const struct nlmsghdr *nlh, | |
36596dad | 72 | u8 family, |
7c95f6d8 PNA |
73 | struct nft_table *table, |
74 | struct nft_chain *chain, | |
75 | const struct nlattr * const *nla) | |
76 | { | |
633c9a84 | 77 | ctx->net = net; |
36596dad | 78 | ctx->family = family; |
26b2f552 | 79 | ctx->level = 0; |
128ad332 PNA |
80 | ctx->table = table; |
81 | ctx->chain = chain; | |
82 | ctx->nla = nla; | |
83 | ctx->portid = NETLINK_CB(skb).portid; | |
84 | ctx->report = nlmsg_report(nlh); | |
85 | ctx->seq = nlh->nlmsg_seq; | |
7c95f6d8 PNA |
86 | } |
87 | ||
8411b644 PNA |
88 | static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx, |
89 | int msg_type, u32 size, gfp_t gfp) | |
1081d11b PNA |
90 | { |
91 | struct nft_trans *trans; | |
92 | ||
8411b644 | 93 | trans = kzalloc(sizeof(struct nft_trans) + size, gfp); |
1081d11b PNA |
94 | if (trans == NULL) |
95 | return NULL; | |
96 | ||
b380e5c7 | 97 | trans->msg_type = msg_type; |
1081d11b PNA |
98 | trans->ctx = *ctx; |
99 | ||
100 | return trans; | |
101 | } | |
102 | ||
8411b644 PNA |
103 | static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx, |
104 | int msg_type, u32 size) | |
105 | { | |
106 | return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL); | |
107 | } | |
108 | ||
1081d11b PNA |
109 | static void nft_trans_destroy(struct nft_trans *trans) |
110 | { | |
111 | list_del(&trans->list); | |
112 | kfree(trans); | |
113 | } | |
114 | ||
c974a3a3 PNA |
115 | static int nf_tables_register_hook(struct net *net, |
116 | const struct nft_table *table, | |
117 | struct nft_chain *chain) | |
d8ee8f7c | 118 | { |
4e25ceb8 | 119 | const struct nft_base_chain *basechain; |
a37061a6 | 120 | const struct nf_hook_ops *ops; |
ae6153b5 | 121 | |
d8ee8f7c | 122 | if (table->flags & NFT_TABLE_F_DORMANT || |
f323d954 | 123 | !nft_is_base_chain(chain)) |
d8ee8f7c PNA |
124 | return 0; |
125 | ||
4e25ceb8 FW |
126 | basechain = nft_base_chain(chain); |
127 | ops = &basechain->ops; | |
ae6153b5 | 128 | |
4e25ceb8 FW |
129 | if (basechain->type->ops_register) |
130 | return basechain->type->ops_register(net, ops); | |
131 | ||
a37061a6 | 132 | return nf_register_net_hook(net, ops); |
d8ee8f7c PNA |
133 | } |
134 | ||
c974a3a3 PNA |
135 | static void nf_tables_unregister_hook(struct net *net, |
136 | const struct nft_table *table, | |
137 | struct nft_chain *chain) | |
c5598794 | 138 | { |
4e25ceb8 FW |
139 | const struct nft_base_chain *basechain; |
140 | const struct nf_hook_ops *ops; | |
141 | ||
d8ee8f7c | 142 | if (table->flags & NFT_TABLE_F_DORMANT || |
f323d954 | 143 | !nft_is_base_chain(chain)) |
d8ee8f7c | 144 | return; |
4e25ceb8 FW |
145 | basechain = nft_base_chain(chain); |
146 | ops = &basechain->ops; | |
d8ee8f7c | 147 | |
4e25ceb8 FW |
148 | if (basechain->type->ops_unregister) |
149 | return basechain->type->ops_unregister(net, ops); | |
150 | ||
151 | nf_unregister_net_hook(net, ops); | |
c5598794 AB |
152 | } |
153 | ||
ee01d542 AB |
154 | static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) |
155 | { | |
156 | struct nft_trans *trans; | |
157 | ||
158 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); | |
159 | if (trans == NULL) | |
160 | return -ENOMEM; | |
161 | ||
162 | if (msg_type == NFT_MSG_NEWTABLE) | |
f2a6d766 | 163 | nft_activate_next(ctx->net, ctx->table); |
ee01d542 AB |
164 | |
165 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
166 | return 0; | |
167 | } | |
168 | ||
169 | static int nft_deltable(struct nft_ctx *ctx) | |
170 | { | |
171 | int err; | |
172 | ||
173 | err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); | |
174 | if (err < 0) | |
175 | return err; | |
176 | ||
f2a6d766 | 177 | nft_deactivate_next(ctx->net, ctx->table); |
ee01d542 AB |
178 | return err; |
179 | } | |
180 | ||
181 | static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) | |
182 | { | |
183 | struct nft_trans *trans; | |
184 | ||
185 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); | |
186 | if (trans == NULL) | |
187 | return -ENOMEM; | |
188 | ||
189 | if (msg_type == NFT_MSG_NEWCHAIN) | |
664b0f8c | 190 | nft_activate_next(ctx->net, ctx->chain); |
ee01d542 AB |
191 | |
192 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static int nft_delchain(struct nft_ctx *ctx) | |
197 | { | |
198 | int err; | |
199 | ||
200 | err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); | |
201 | if (err < 0) | |
202 | return err; | |
203 | ||
204 | ctx->table->use--; | |
664b0f8c | 205 | nft_deactivate_next(ctx->net, ctx->chain); |
ee01d542 AB |
206 | |
207 | return err; | |
208 | } | |
209 | ||
bb7b40ae PNA |
210 | static void nft_rule_expr_activate(const struct nft_ctx *ctx, |
211 | struct nft_rule *rule) | |
212 | { | |
213 | struct nft_expr *expr; | |
214 | ||
215 | expr = nft_expr_first(rule); | |
216 | while (expr != nft_expr_last(rule) && expr->ops) { | |
217 | if (expr->ops->activate) | |
218 | expr->ops->activate(ctx, expr); | |
219 | ||
220 | expr = nft_expr_next(expr); | |
221 | } | |
222 | } | |
223 | ||
224 | static void nft_rule_expr_deactivate(const struct nft_ctx *ctx, | |
225 | struct nft_rule *rule) | |
226 | { | |
227 | struct nft_expr *expr; | |
228 | ||
229 | expr = nft_expr_first(rule); | |
230 | while (expr != nft_expr_last(rule) && expr->ops) { | |
231 | if (expr->ops->deactivate) | |
232 | expr->ops->deactivate(ctx, expr); | |
233 | ||
234 | expr = nft_expr_next(expr); | |
235 | } | |
236 | } | |
237 | ||
ee01d542 AB |
238 | static int |
239 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) | |
240 | { | |
241 | /* You cannot delete the same rule twice */ | |
889f7ee7 PNA |
242 | if (nft_is_active_next(ctx->net, rule)) { |
243 | nft_deactivate_next(ctx->net, rule); | |
ee01d542 AB |
244 | ctx->chain->use--; |
245 | return 0; | |
246 | } | |
247 | return -ENOENT; | |
248 | } | |
249 | ||
250 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, | |
251 | struct nft_rule *rule) | |
252 | { | |
253 | struct nft_trans *trans; | |
254 | ||
255 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); | |
256 | if (trans == NULL) | |
257 | return NULL; | |
258 | ||
1a94e38d PNA |
259 | if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) { |
260 | nft_trans_rule_id(trans) = | |
261 | ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID])); | |
262 | } | |
ee01d542 AB |
263 | nft_trans_rule(trans) = rule; |
264 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
265 | ||
266 | return trans; | |
267 | } | |
268 | ||
269 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) | |
270 | { | |
271 | struct nft_trans *trans; | |
272 | int err; | |
273 | ||
274 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); | |
275 | if (trans == NULL) | |
276 | return -ENOMEM; | |
277 | ||
278 | err = nf_tables_delrule_deactivate(ctx, rule); | |
279 | if (err < 0) { | |
280 | nft_trans_destroy(trans); | |
281 | return err; | |
282 | } | |
bb7b40ae | 283 | nft_rule_expr_deactivate(ctx, rule); |
ee01d542 AB |
284 | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static int nft_delrule_by_chain(struct nft_ctx *ctx) | |
289 | { | |
290 | struct nft_rule *rule; | |
291 | int err; | |
292 | ||
293 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
294 | err = nft_delrule(ctx, rule); | |
295 | if (err < 0) | |
296 | return err; | |
297 | } | |
298 | return 0; | |
299 | } | |
300 | ||
ee01d542 AB |
301 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, |
302 | struct nft_set *set) | |
303 | { | |
304 | struct nft_trans *trans; | |
305 | ||
306 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); | |
307 | if (trans == NULL) | |
308 | return -ENOMEM; | |
309 | ||
310 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { | |
311 | nft_trans_set_id(trans) = | |
312 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); | |
37a9cc52 | 313 | nft_activate_next(ctx->net, set); |
ee01d542 AB |
314 | } |
315 | nft_trans_set(trans) = set; | |
316 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
321 | static int nft_delset(struct nft_ctx *ctx, struct nft_set *set) | |
322 | { | |
323 | int err; | |
324 | ||
325 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); | |
326 | if (err < 0) | |
327 | return err; | |
328 | ||
37a9cc52 | 329 | nft_deactivate_next(ctx->net, set); |
ee01d542 AB |
330 | ctx->table->use--; |
331 | ||
332 | return err; | |
333 | } | |
334 | ||
e5009240 PNA |
335 | static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type, |
336 | struct nft_object *obj) | |
337 | { | |
338 | struct nft_trans *trans; | |
339 | ||
340 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj)); | |
341 | if (trans == NULL) | |
342 | return -ENOMEM; | |
343 | ||
344 | if (msg_type == NFT_MSG_NEWOBJ) | |
345 | nft_activate_next(ctx->net, obj); | |
346 | ||
347 | nft_trans_obj(trans) = obj; | |
348 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj) | |
354 | { | |
355 | int err; | |
356 | ||
357 | err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj); | |
358 | if (err < 0) | |
359 | return err; | |
360 | ||
361 | nft_deactivate_next(ctx->net, obj); | |
362 | ctx->table->use--; | |
363 | ||
364 | return err; | |
365 | } | |
366 | ||
3b49e2e9 PNA |
367 | static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type, |
368 | struct nft_flowtable *flowtable) | |
369 | { | |
370 | struct nft_trans *trans; | |
371 | ||
372 | trans = nft_trans_alloc(ctx, msg_type, | |
373 | sizeof(struct nft_trans_flowtable)); | |
374 | if (trans == NULL) | |
375 | return -ENOMEM; | |
376 | ||
377 | if (msg_type == NFT_MSG_NEWFLOWTABLE) | |
378 | nft_activate_next(ctx->net, flowtable); | |
379 | ||
380 | nft_trans_flowtable(trans) = flowtable; | |
381 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | static int nft_delflowtable(struct nft_ctx *ctx, | |
387 | struct nft_flowtable *flowtable) | |
388 | { | |
389 | int err; | |
390 | ||
391 | err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable); | |
392 | if (err < 0) | |
393 | return err; | |
394 | ||
395 | nft_deactivate_next(ctx->net, flowtable); | |
396 | ctx->table->use--; | |
397 | ||
398 | return err; | |
399 | } | |
400 | ||
96518518 PM |
401 | /* |
402 | * Tables | |
403 | */ | |
404 | ||
36596dad | 405 | static struct nft_table *nft_table_lookup(const struct net *net, |
f2a6d766 | 406 | const struct nlattr *nla, |
36596dad | 407 | u8 family, u8 genmask) |
96518518 PM |
408 | { |
409 | struct nft_table *table; | |
410 | ||
cac20fcd PNA |
411 | if (nla == NULL) |
412 | return ERR_PTR(-EINVAL); | |
413 | ||
d9adf22a | 414 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
f2a6d766 | 415 | if (!nla_strcmp(nla, table->name) && |
98319cb9 | 416 | table->family == family && |
f2a6d766 | 417 | nft_active_genmask(table, genmask)) |
96518518 PM |
418 | return table; |
419 | } | |
cac20fcd PNA |
420 | |
421 | return ERR_PTR(-ENOENT); | |
96518518 PM |
422 | } |
423 | ||
3ecbfd65 HS |
424 | static struct nft_table *nft_table_lookup_byhandle(const struct net *net, |
425 | const struct nlattr *nla, | |
426 | u8 genmask) | |
427 | { | |
428 | struct nft_table *table; | |
429 | ||
430 | list_for_each_entry(table, &net->nft.tables, list) { | |
431 | if (be64_to_cpu(nla_get_be64(nla)) == table->handle && | |
432 | nft_active_genmask(table, genmask)) | |
433 | return table; | |
434 | } | |
3ecbfd65 HS |
435 | |
436 | return ERR_PTR(-ENOENT); | |
437 | } | |
438 | ||
96518518 PM |
439 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) |
440 | { | |
441 | return ++table->hgenerator; | |
442 | } | |
443 | ||
32537e91 | 444 | static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX]; |
9370761c | 445 | |
32537e91 | 446 | static const struct nft_chain_type * |
1ea26cca | 447 | __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family) |
9370761c PNA |
448 | { |
449 | int i; | |
450 | ||
baae3e62 | 451 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
452 | if (chain_type[family][i] != NULL && |
453 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 454 | return chain_type[family][i]; |
9370761c | 455 | } |
baae3e62 | 456 | return NULL; |
9370761c PNA |
457 | } |
458 | ||
452238e8 FW |
459 | /* |
460 | * Loading a module requires dropping mutex that guards the | |
461 | * transaction. | |
462 | * We first need to abort any pending transactions as once | |
463 | * mutex is unlocked a different client could start a new | |
464 | * transaction. It must not see any 'future generation' | |
465 | * changes * as these changes will never happen. | |
466 | */ | |
467 | #ifdef CONFIG_MODULES | |
468 | static int __nf_tables_abort(struct net *net); | |
469 | ||
470 | static void nft_request_module(struct net *net, const char *fmt, ...) | |
471 | { | |
472 | char module_name[MODULE_NAME_LEN]; | |
473 | va_list args; | |
474 | int ret; | |
475 | ||
476 | __nf_tables_abort(net); | |
477 | ||
478 | va_start(args, fmt); | |
479 | ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args); | |
480 | va_end(args); | |
481 | if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret)) | |
482 | return; | |
483 | ||
f102d66b | 484 | mutex_unlock(&net->nft.commit_mutex); |
452238e8 | 485 | request_module("%s", module_name); |
f102d66b | 486 | mutex_lock(&net->nft.commit_mutex); |
452238e8 FW |
487 | } |
488 | #endif | |
489 | ||
f102d66b FW |
490 | static void lockdep_nfnl_nft_mutex_not_held(void) |
491 | { | |
492 | #ifdef CONFIG_PROVE_LOCKING | |
493 | WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES)); | |
494 | #endif | |
495 | } | |
496 | ||
32537e91 | 497 | static const struct nft_chain_type * |
452238e8 FW |
498 | nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla, |
499 | u8 family, bool autoload) | |
9370761c | 500 | { |
32537e91 | 501 | const struct nft_chain_type *type; |
9370761c | 502 | |
1ea26cca | 503 | type = __nf_tables_chain_type_lookup(nla, family); |
93b0806f PM |
504 | if (type != NULL) |
505 | return type; | |
f102d66b FW |
506 | |
507 | lockdep_nfnl_nft_mutex_not_held(); | |
9370761c | 508 | #ifdef CONFIG_MODULES |
93b0806f | 509 | if (autoload) { |
452238e8 FW |
510 | nft_request_module(net, "nft-chain-%u-%.*s", family, |
511 | nla_len(nla), (const char *)nla_data(nla)); | |
1ea26cca | 512 | type = __nf_tables_chain_type_lookup(nla, family); |
93b0806f PM |
513 | if (type != NULL) |
514 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
515 | } |
516 | #endif | |
93b0806f | 517 | return ERR_PTR(-ENOENT); |
9370761c PNA |
518 | } |
519 | ||
96518518 | 520 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
1cae565e PNA |
521 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
522 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
9ddf6323 | 523 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
3ecbfd65 | 524 | [NFTA_TABLE_HANDLE] = { .type = NLA_U64 }, |
96518518 PM |
525 | }; |
526 | ||
84d7fce6 PNA |
527 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
528 | u32 portid, u32 seq, int event, u32 flags, | |
529 | int family, const struct nft_table *table) | |
96518518 PM |
530 | { |
531 | struct nlmsghdr *nlh; | |
532 | struct nfgenmsg *nfmsg; | |
533 | ||
dedb67c4 | 534 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
535 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
536 | if (nlh == NULL) | |
537 | goto nla_put_failure; | |
538 | ||
539 | nfmsg = nlmsg_data(nlh); | |
540 | nfmsg->nfgen_family = family; | |
541 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 542 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 | 543 | |
9ddf6323 | 544 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 | 545 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
3ecbfd65 HS |
546 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) || |
547 | nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle), | |
548 | NFTA_TABLE_PAD)) | |
96518518 PM |
549 | goto nla_put_failure; |
550 | ||
053c095a JB |
551 | nlmsg_end(skb, nlh); |
552 | return 0; | |
96518518 PM |
553 | |
554 | nla_put_failure: | |
555 | nlmsg_trim(skb, nlh); | |
556 | return -1; | |
557 | } | |
558 | ||
25e94a99 | 559 | static void nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
560 | { |
561 | struct sk_buff *skb; | |
96518518 PM |
562 | int err; |
563 | ||
128ad332 PNA |
564 | if (!ctx->report && |
565 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 566 | return; |
96518518 | 567 | |
96518518 PM |
568 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
569 | if (skb == NULL) | |
570 | goto err; | |
571 | ||
84d7fce6 | 572 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 573 | event, 0, ctx->family, ctx->table); |
96518518 PM |
574 | if (err < 0) { |
575 | kfree_skb(skb); | |
576 | goto err; | |
577 | } | |
578 | ||
25e94a99 PNA |
579 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
580 | ctx->report, GFP_KERNEL); | |
581 | return; | |
96518518 | 582 | err: |
25e94a99 | 583 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
584 | } |
585 | ||
586 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
587 | struct netlink_callback *cb) | |
588 | { | |
589 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
96518518 PM |
590 | const struct nft_table *table; |
591 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 592 | struct net *net = sock_net(skb->sk); |
96518518 PM |
593 | int family = nfmsg->nfgen_family; |
594 | ||
e688a7f8 | 595 | rcu_read_lock(); |
38e029f1 PNA |
596 | cb->seq = net->nft.base_seq; |
597 | ||
36596dad | 598 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 599 | if (family != NFPROTO_UNSPEC && family != table->family) |
96518518 PM |
600 | continue; |
601 | ||
36596dad PNA |
602 | if (idx < s_idx) |
603 | goto cont; | |
604 | if (idx > s_idx) | |
605 | memset(&cb->args[1], 0, | |
606 | sizeof(cb->args) - sizeof(cb->args[0])); | |
607 | if (!nft_is_active(net, table)) | |
608 | continue; | |
609 | if (nf_tables_fill_table_info(skb, net, | |
610 | NETLINK_CB(cb->skb).portid, | |
611 | cb->nlh->nlmsg_seq, | |
612 | NFT_MSG_NEWTABLE, NLM_F_MULTI, | |
98319cb9 | 613 | table->family, table) < 0) |
36596dad PNA |
614 | goto done; |
615 | ||
616 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 | 617 | cont: |
36596dad | 618 | idx++; |
96518518 PM |
619 | } |
620 | done: | |
e688a7f8 | 621 | rcu_read_unlock(); |
96518518 PM |
622 | cb->args[0] = idx; |
623 | return skb->len; | |
624 | } | |
625 | ||
d9adf22a FW |
626 | static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb, |
627 | const struct nlmsghdr *nlh, | |
628 | struct netlink_dump_control *c) | |
629 | { | |
630 | int err; | |
631 | ||
632 | if (!try_module_get(THIS_MODULE)) | |
633 | return -EINVAL; | |
634 | ||
635 | rcu_read_unlock(); | |
636 | err = netlink_dump_start(nlsk, skb, nlh, c); | |
637 | rcu_read_lock(); | |
638 | module_put(THIS_MODULE); | |
639 | ||
640 | return err; | |
641 | } | |
642 | ||
643 | /* called with rcu_read_lock held */ | |
7b8002a1 PNA |
644 | static int nf_tables_gettable(struct net *net, struct sock *nlsk, |
645 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
646 | const struct nlattr * const nla[], |
647 | struct netlink_ext_ack *extack) | |
96518518 PM |
648 | { |
649 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 650 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
651 | const struct nft_table *table; |
652 | struct sk_buff *skb2; | |
653 | int family = nfmsg->nfgen_family; | |
654 | int err; | |
655 | ||
656 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
657 | struct netlink_dump_control c = { | |
658 | .dump = nf_tables_dump_tables, | |
d9adf22a | 659 | .module = THIS_MODULE, |
96518518 | 660 | }; |
d9adf22a FW |
661 | |
662 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); | |
96518518 PM |
663 | } |
664 | ||
cac20fcd | 665 | table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask); |
36dd1bcc PNA |
666 | if (IS_ERR(table)) { |
667 | NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]); | |
96518518 | 668 | return PTR_ERR(table); |
36dd1bcc | 669 | } |
96518518 | 670 | |
d9adf22a | 671 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
96518518 PM |
672 | if (!skb2) |
673 | return -ENOMEM; | |
674 | ||
84d7fce6 | 675 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
676 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
677 | family, table); | |
678 | if (err < 0) | |
679 | goto err; | |
680 | ||
681 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
682 | ||
683 | err: | |
684 | kfree_skb(skb2); | |
685 | return err; | |
686 | } | |
687 | ||
c9c17211 | 688 | static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt) |
10435c11 F |
689 | { |
690 | struct nft_chain *chain; | |
691 | u32 i = 0; | |
692 | ||
693 | list_for_each_entry(chain, &table->chains, list) { | |
694 | if (!nft_is_active_next(net, chain)) | |
695 | continue; | |
f323d954 | 696 | if (!nft_is_base_chain(chain)) |
10435c11 F |
697 | continue; |
698 | ||
699 | if (cnt && i++ == cnt) | |
700 | break; | |
701 | ||
c974a3a3 | 702 | nf_unregister_net_hook(net, &nft_base_chain(chain)->ops); |
10435c11 F |
703 | } |
704 | } | |
705 | ||
c9c17211 | 706 | static int nf_tables_table_enable(struct net *net, struct nft_table *table) |
9ddf6323 PNA |
707 | { |
708 | struct nft_chain *chain; | |
709 | int err, i = 0; | |
710 | ||
711 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
712 | if (!nft_is_active_next(net, chain)) |
713 | continue; | |
f323d954 | 714 | if (!nft_is_base_chain(chain)) |
d2012975 PNA |
715 | continue; |
716 | ||
c974a3a3 | 717 | err = nf_register_net_hook(net, &nft_base_chain(chain)->ops); |
9ddf6323 PNA |
718 | if (err < 0) |
719 | goto err; | |
720 | ||
721 | i++; | |
722 | } | |
723 | return 0; | |
724 | err: | |
10435c11 | 725 | if (i) |
c9c17211 | 726 | nft_table_disable(net, table, i); |
9ddf6323 PNA |
727 | return err; |
728 | } | |
729 | ||
c9c17211 | 730 | static void nf_tables_table_disable(struct net *net, struct nft_table *table) |
9ddf6323 | 731 | { |
c9c17211 | 732 | nft_table_disable(net, table, 0); |
9ddf6323 PNA |
733 | } |
734 | ||
e1aaca93 | 735 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 736 | { |
55dd6f93 | 737 | struct nft_trans *trans; |
e1aaca93 | 738 | u32 flags; |
55dd6f93 | 739 | int ret = 0; |
9ddf6323 | 740 | |
e1aaca93 PNA |
741 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
742 | return 0; | |
9ddf6323 | 743 | |
e1aaca93 PNA |
744 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
745 | if (flags & ~NFT_TABLE_F_DORMANT) | |
746 | return -EINVAL; | |
747 | ||
63283dd2 PNA |
748 | if (flags == ctx->table->flags) |
749 | return 0; | |
750 | ||
55dd6f93 PNA |
751 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
752 | sizeof(struct nft_trans_table)); | |
753 | if (trans == NULL) | |
754 | return -ENOMEM; | |
9ddf6323 | 755 | |
e1aaca93 PNA |
756 | if ((flags & NFT_TABLE_F_DORMANT) && |
757 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 758 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
759 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
760 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
c9c17211 | 761 | ret = nf_tables_table_enable(ctx->net, ctx->table); |
55dd6f93 | 762 | if (ret >= 0) { |
e1aaca93 | 763 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 764 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 765 | } |
9ddf6323 | 766 | } |
e1aaca93 PNA |
767 | if (ret < 0) |
768 | goto err; | |
9ddf6323 | 769 | |
55dd6f93 PNA |
770 | nft_trans_table_update(trans) = true; |
771 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
772 | return 0; | |
9ddf6323 | 773 | err: |
55dd6f93 | 774 | nft_trans_destroy(trans); |
9ddf6323 PNA |
775 | return ret; |
776 | } | |
777 | ||
1b2470e5 FW |
778 | static u32 nft_chain_hash(const void *data, u32 len, u32 seed) |
779 | { | |
780 | const char *name = data; | |
781 | ||
782 | return jhash(name, strlen(name), seed); | |
783 | } | |
784 | ||
785 | static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed) | |
786 | { | |
787 | const struct nft_chain *chain = data; | |
788 | ||
789 | return nft_chain_hash(chain->name, 0, seed); | |
790 | } | |
791 | ||
792 | static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg, | |
793 | const void *ptr) | |
794 | { | |
795 | const struct nft_chain *chain = ptr; | |
796 | const char *name = arg->key; | |
797 | ||
798 | return strcmp(chain->name, name); | |
799 | } | |
800 | ||
633c9a84 PNA |
801 | static int nf_tables_newtable(struct net *net, struct sock *nlsk, |
802 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
803 | const struct nlattr * const nla[], |
804 | struct netlink_ext_ack *extack) | |
96518518 PM |
805 | { |
806 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 807 | u8 genmask = nft_genmask_next(net); |
96518518 | 808 | int family = nfmsg->nfgen_family; |
36dd1bcc PNA |
809 | const struct nlattr *attr; |
810 | struct nft_table *table; | |
c5c1f975 | 811 | u32 flags = 0; |
e1aaca93 | 812 | struct nft_ctx ctx; |
55dd6f93 | 813 | int err; |
96518518 | 814 | |
f102d66b | 815 | lockdep_assert_held(&net->nft.commit_mutex); |
36dd1bcc PNA |
816 | attr = nla[NFTA_TABLE_NAME]; |
817 | table = nft_table_lookup(net, attr, family, genmask); | |
96518518 PM |
818 | if (IS_ERR(table)) { |
819 | if (PTR_ERR(table) != -ENOENT) | |
820 | return PTR_ERR(table); | |
1a28ad74 | 821 | } else { |
36dd1bcc PNA |
822 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
823 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 824 | return -EEXIST; |
36dd1bcc | 825 | } |
96518518 PM |
826 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
827 | return -EOPNOTSUPP; | |
e1aaca93 | 828 | |
98319cb9 | 829 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e1aaca93 | 830 | return nf_tables_updtable(&ctx); |
96518518 PM |
831 | } |
832 | ||
c5c1f975 PM |
833 | if (nla[NFTA_TABLE_FLAGS]) { |
834 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
835 | if (flags & ~NFT_TABLE_F_DORMANT) | |
836 | return -EINVAL; | |
837 | } | |
838 | ||
ffdb210e | 839 | err = -ENOMEM; |
1cae565e | 840 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
ffdb210e | 841 | if (table == NULL) |
98319cb9 | 842 | goto err_kzalloc; |
96518518 | 843 | |
36dd1bcc | 844 | table->name = nla_strdup(attr, GFP_KERNEL); |
e46abbcc | 845 | if (table->name == NULL) |
98319cb9 | 846 | goto err_strdup; |
e46abbcc | 847 | |
1b2470e5 FW |
848 | err = rhltable_init(&table->chains_ht, &nft_chain_ht_params); |
849 | if (err) | |
850 | goto err_chain_ht; | |
851 | ||
96518518 | 852 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 853 | INIT_LIST_HEAD(&table->sets); |
e5009240 | 854 | INIT_LIST_HEAD(&table->objects); |
3b49e2e9 | 855 | INIT_LIST_HEAD(&table->flowtables); |
98319cb9 | 856 | table->family = family; |
c5c1f975 | 857 | table->flags = flags; |
3ecbfd65 | 858 | table->handle = ++table_handle; |
9ddf6323 | 859 | |
98319cb9 | 860 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
55dd6f93 | 861 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
ffdb210e | 862 | if (err < 0) |
98319cb9 | 863 | goto err_trans; |
ffdb210e | 864 | |
36596dad | 865 | list_add_tail_rcu(&table->list, &net->nft.tables); |
96518518 | 866 | return 0; |
98319cb9 | 867 | err_trans: |
1b2470e5 FW |
868 | rhltable_destroy(&table->chains_ht); |
869 | err_chain_ht: | |
e46abbcc | 870 | kfree(table->name); |
98319cb9 | 871 | err_strdup: |
ffdb210e | 872 | kfree(table); |
98319cb9 | 873 | err_kzalloc: |
ffdb210e | 874 | return err; |
96518518 PM |
875 | } |
876 | ||
b9ac12ef AB |
877 | static int nft_flush_table(struct nft_ctx *ctx) |
878 | { | |
3b49e2e9 | 879 | struct nft_flowtable *flowtable, *nft; |
b9ac12ef | 880 | struct nft_chain *chain, *nc; |
e5009240 | 881 | struct nft_object *obj, *ne; |
b9ac12ef | 882 | struct nft_set *set, *ns; |
3b49e2e9 | 883 | int err; |
b9ac12ef | 884 | |
a2f18db0 | 885 | list_for_each_entry(chain, &ctx->table->chains, list) { |
664b0f8c PNA |
886 | if (!nft_is_active_next(ctx->net, chain)) |
887 | continue; | |
888 | ||
b9ac12ef AB |
889 | ctx->chain = chain; |
890 | ||
891 | err = nft_delrule_by_chain(ctx); | |
892 | if (err < 0) | |
893 | goto out; | |
b9ac12ef AB |
894 | } |
895 | ||
896 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
37a9cc52 PNA |
897 | if (!nft_is_active_next(ctx->net, set)) |
898 | continue; | |
899 | ||
408070d6 | 900 | if (nft_set_is_anonymous(set) && |
b9ac12ef AB |
901 | !list_empty(&set->bindings)) |
902 | continue; | |
903 | ||
904 | err = nft_delset(ctx, set); | |
905 | if (err < 0) | |
906 | goto out; | |
907 | } | |
908 | ||
3b49e2e9 PNA |
909 | list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) { |
910 | err = nft_delflowtable(ctx, flowtable); | |
911 | if (err < 0) | |
912 | goto out; | |
913 | } | |
914 | ||
e5009240 PNA |
915 | list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { |
916 | err = nft_delobj(ctx, obj); | |
917 | if (err < 0) | |
918 | goto out; | |
919 | } | |
920 | ||
a2f18db0 | 921 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
664b0f8c PNA |
922 | if (!nft_is_active_next(ctx->net, chain)) |
923 | continue; | |
924 | ||
a2f18db0 PNA |
925 | ctx->chain = chain; |
926 | ||
927 | err = nft_delchain(ctx); | |
928 | if (err < 0) | |
929 | goto out; | |
930 | } | |
931 | ||
b9ac12ef AB |
932 | err = nft_deltable(ctx); |
933 | out: | |
934 | return err; | |
935 | } | |
936 | ||
937 | static int nft_flush(struct nft_ctx *ctx, int family) | |
938 | { | |
b9ac12ef AB |
939 | struct nft_table *table, *nt; |
940 | const struct nlattr * const *nla = ctx->nla; | |
941 | int err = 0; | |
942 | ||
36596dad | 943 | list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) { |
98319cb9 | 944 | if (family != AF_UNSPEC && table->family != family) |
b9ac12ef AB |
945 | continue; |
946 | ||
98319cb9 | 947 | ctx->family = table->family; |
f2a6d766 | 948 | |
36596dad PNA |
949 | if (!nft_is_active_next(ctx->net, table)) |
950 | continue; | |
b9ac12ef | 951 | |
36596dad PNA |
952 | if (nla[NFTA_TABLE_NAME] && |
953 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
954 | continue; | |
b9ac12ef | 955 | |
36596dad PNA |
956 | ctx->table = table; |
957 | ||
958 | err = nft_flush_table(ctx); | |
959 | if (err < 0) | |
960 | goto out; | |
b9ac12ef AB |
961 | } |
962 | out: | |
963 | return err; | |
964 | } | |
965 | ||
633c9a84 PNA |
966 | static int nf_tables_deltable(struct net *net, struct sock *nlsk, |
967 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
968 | const struct nlattr * const nla[], |
969 | struct netlink_ext_ack *extack) | |
96518518 PM |
970 | { |
971 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 972 | u8 genmask = nft_genmask_next(net); |
ee01d542 | 973 | int family = nfmsg->nfgen_family; |
36dd1bcc PNA |
974 | const struct nlattr *attr; |
975 | struct nft_table *table; | |
55dd6f93 | 976 | struct nft_ctx ctx; |
96518518 | 977 | |
36596dad | 978 | nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla); |
3ecbfd65 HS |
979 | if (family == AF_UNSPEC || |
980 | (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE])) | |
b9ac12ef AB |
981 | return nft_flush(&ctx, family); |
982 | ||
36dd1bcc PNA |
983 | if (nla[NFTA_TABLE_HANDLE]) { |
984 | attr = nla[NFTA_TABLE_HANDLE]; | |
985 | table = nft_table_lookup_byhandle(net, attr, genmask); | |
986 | } else { | |
987 | attr = nla[NFTA_TABLE_NAME]; | |
988 | table = nft_table_lookup(net, attr, family, genmask); | |
989 | } | |
3ecbfd65 | 990 | |
36dd1bcc PNA |
991 | if (IS_ERR(table)) { |
992 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 993 | return PTR_ERR(table); |
36dd1bcc | 994 | } |
96518518 | 995 | |
a8278400 PNA |
996 | if (nlh->nlmsg_flags & NLM_F_NONREC && |
997 | table->use > 0) | |
998 | return -EBUSY; | |
999 | ||
98319cb9 | 1000 | ctx.family = family; |
b9ac12ef | 1001 | ctx.table = table; |
55dd6f93 | 1002 | |
b9ac12ef | 1003 | return nft_flush_table(&ctx); |
96518518 PM |
1004 | } |
1005 | ||
55dd6f93 PNA |
1006 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
1007 | { | |
4fefee57 PNA |
1008 | BUG_ON(ctx->table->use > 0); |
1009 | ||
1b2470e5 | 1010 | rhltable_destroy(&ctx->table->chains_ht); |
e46abbcc | 1011 | kfree(ctx->table->name); |
55dd6f93 | 1012 | kfree(ctx->table); |
55dd6f93 PNA |
1013 | } |
1014 | ||
cc07eeb0 | 1015 | void nft_register_chain_type(const struct nft_chain_type *ctype) |
96518518 | 1016 | { |
d8297d4f | 1017 | if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO)) |
cc07eeb0 | 1018 | return; |
d8297d4f | 1019 | |
96518518 | 1020 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
cc07eeb0 PNA |
1021 | if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) { |
1022 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1023 | return; | |
96518518 | 1024 | } |
9370761c | 1025 | chain_type[ctype->family][ctype->type] = ctype; |
96518518 | 1026 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
96518518 | 1027 | } |
9370761c | 1028 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 1029 | |
32537e91 | 1030 | void nft_unregister_chain_type(const struct nft_chain_type *ctype) |
96518518 | 1031 | { |
96518518 | 1032 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 1033 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
1034 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1035 | } | |
9370761c | 1036 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
1037 | |
1038 | /* | |
1039 | * Chains | |
1040 | */ | |
1041 | ||
1042 | static struct nft_chain * | |
cac20fcd | 1043 | nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask) |
96518518 PM |
1044 | { |
1045 | struct nft_chain *chain; | |
1046 | ||
1047 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
1048 | if (chain->handle == handle && |
1049 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
1050 | return chain; |
1051 | } | |
1052 | ||
1053 | return ERR_PTR(-ENOENT); | |
1054 | } | |
1055 | ||
f102d66b FW |
1056 | static bool lockdep_commit_lock_is_held(struct net *net) |
1057 | { | |
1058 | #ifdef CONFIG_PROVE_LOCKING | |
1059 | return lockdep_is_held(&net->nft.commit_mutex); | |
1060 | #else | |
1061 | return true; | |
1062 | #endif | |
1063 | } | |
1064 | ||
1065 | static struct nft_chain *nft_chain_lookup(struct net *net, | |
1066 | struct nft_table *table, | |
cac20fcd | 1067 | const struct nlattr *nla, u8 genmask) |
96518518 | 1068 | { |
1b2470e5 FW |
1069 | char search[NFT_CHAIN_MAXNAMELEN + 1]; |
1070 | struct rhlist_head *tmp, *list; | |
96518518 PM |
1071 | struct nft_chain *chain; |
1072 | ||
1073 | if (nla == NULL) | |
1074 | return ERR_PTR(-EINVAL); | |
1075 | ||
1b2470e5 | 1076 | nla_strlcpy(search, nla, sizeof(search)); |
96518518 | 1077 | |
1b2470e5 | 1078 | WARN_ON(!rcu_read_lock_held() && |
f102d66b | 1079 | !lockdep_commit_lock_is_held(net)); |
1b2470e5 FW |
1080 | |
1081 | chain = ERR_PTR(-ENOENT); | |
1082 | rcu_read_lock(); | |
1083 | list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params); | |
1084 | if (!list) | |
1085 | goto out_unlock; | |
1086 | ||
1087 | rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) { | |
1088 | if (nft_active_genmask(chain, genmask)) | |
1089 | goto out_unlock; | |
1090 | } | |
1091 | chain = ERR_PTR(-ENOENT); | |
1092 | out_unlock: | |
1093 | rcu_read_unlock(); | |
1094 | return chain; | |
96518518 PM |
1095 | } |
1096 | ||
1097 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
b2fbd044 LZ |
1098 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, |
1099 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
1100 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
1101 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
1102 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1103 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 1104 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 1105 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 1106 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
1107 | }; |
1108 | ||
1109 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
1110 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
1111 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
2cbce139 PNA |
1112 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
1113 | .len = IFNAMSIZ - 1 }, | |
96518518 PM |
1114 | }; |
1115 | ||
0ca743a5 PNA |
1116 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
1117 | { | |
1118 | struct nft_stats *cpu_stats, total; | |
1119 | struct nlattr *nest; | |
ce355e20 ED |
1120 | unsigned int seq; |
1121 | u64 pkts, bytes; | |
0ca743a5 PNA |
1122 | int cpu; |
1123 | ||
1124 | memset(&total, 0, sizeof(total)); | |
1125 | for_each_possible_cpu(cpu) { | |
1126 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
1127 | do { |
1128 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
1129 | pkts = cpu_stats->pkts; | |
1130 | bytes = cpu_stats->bytes; | |
1131 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
1132 | total.pkts += pkts; | |
1133 | total.bytes += bytes; | |
0ca743a5 PNA |
1134 | } |
1135 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
1136 | if (nest == NULL) | |
1137 | goto nla_put_failure; | |
1138 | ||
b46f6ded ND |
1139 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), |
1140 | NFTA_COUNTER_PAD) || | |
1141 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), | |
1142 | NFTA_COUNTER_PAD)) | |
0ca743a5 PNA |
1143 | goto nla_put_failure; |
1144 | ||
1145 | nla_nest_end(skb, nest); | |
1146 | return 0; | |
1147 | ||
1148 | nla_put_failure: | |
1149 | return -ENOSPC; | |
1150 | } | |
1151 | ||
84d7fce6 PNA |
1152 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
1153 | u32 portid, u32 seq, int event, u32 flags, | |
1154 | int family, const struct nft_table *table, | |
96518518 PM |
1155 | const struct nft_chain *chain) |
1156 | { | |
1157 | struct nlmsghdr *nlh; | |
1158 | struct nfgenmsg *nfmsg; | |
1159 | ||
dedb67c4 | 1160 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
1161 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
1162 | if (nlh == NULL) | |
1163 | goto nla_put_failure; | |
1164 | ||
1165 | nfmsg = nlmsg_data(nlh); | |
1166 | nfmsg->nfgen_family = family; | |
1167 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1168 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1169 | |
1170 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
1171 | goto nla_put_failure; | |
b46f6ded ND |
1172 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), |
1173 | NFTA_CHAIN_PAD)) | |
96518518 PM |
1174 | goto nla_put_failure; |
1175 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
1176 | goto nla_put_failure; | |
1177 | ||
f323d954 | 1178 | if (nft_is_base_chain(chain)) { |
0ca743a5 | 1179 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
c974a3a3 | 1180 | const struct nf_hook_ops *ops = &basechain->ops; |
0ca743a5 PNA |
1181 | struct nlattr *nest; |
1182 | ||
1183 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
1184 | if (nest == NULL) |
1185 | goto nla_put_failure; | |
1186 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
1187 | goto nla_put_failure; | |
1188 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
1189 | goto nla_put_failure; | |
2cbce139 PNA |
1190 | if (basechain->dev_name[0] && |
1191 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) | |
1192 | goto nla_put_failure; | |
96518518 | 1193 | nla_nest_end(skb, nest); |
9370761c | 1194 | |
0ca743a5 PNA |
1195 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
1196 | htonl(basechain->policy))) | |
1197 | goto nla_put_failure; | |
1198 | ||
baae3e62 PM |
1199 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
1200 | goto nla_put_failure; | |
0ca743a5 | 1201 | |
5f9bfe0e | 1202 | if (basechain->stats && nft_dump_stats(skb, basechain->stats)) |
0ca743a5 | 1203 | goto nla_put_failure; |
96518518 PM |
1204 | } |
1205 | ||
0ca743a5 PNA |
1206 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
1207 | goto nla_put_failure; | |
1208 | ||
053c095a JB |
1209 | nlmsg_end(skb, nlh); |
1210 | return 0; | |
96518518 PM |
1211 | |
1212 | nla_put_failure: | |
1213 | nlmsg_trim(skb, nlh); | |
1214 | return -1; | |
1215 | } | |
1216 | ||
25e94a99 | 1217 | static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
1218 | { |
1219 | struct sk_buff *skb; | |
96518518 PM |
1220 | int err; |
1221 | ||
128ad332 PNA |
1222 | if (!ctx->report && |
1223 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 1224 | return; |
96518518 | 1225 | |
96518518 PM |
1226 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1227 | if (skb == NULL) | |
1228 | goto err; | |
1229 | ||
84d7fce6 | 1230 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 1231 | event, 0, ctx->family, ctx->table, |
35151d84 | 1232 | ctx->chain); |
96518518 PM |
1233 | if (err < 0) { |
1234 | kfree_skb(skb); | |
1235 | goto err; | |
1236 | } | |
1237 | ||
25e94a99 PNA |
1238 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1239 | ctx->report, GFP_KERNEL); | |
1240 | return; | |
96518518 | 1241 | err: |
25e94a99 | 1242 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
1243 | } |
1244 | ||
1245 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1246 | struct netlink_callback *cb) | |
1247 | { | |
1248 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
96518518 PM |
1249 | const struct nft_table *table; |
1250 | const struct nft_chain *chain; | |
1251 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1252 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1253 | int family = nfmsg->nfgen_family; |
1254 | ||
e688a7f8 | 1255 | rcu_read_lock(); |
38e029f1 PNA |
1256 | cb->seq = net->nft.base_seq; |
1257 | ||
36596dad | 1258 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 1259 | if (family != NFPROTO_UNSPEC && family != table->family) |
96518518 PM |
1260 | continue; |
1261 | ||
36596dad PNA |
1262 | list_for_each_entry_rcu(chain, &table->chains, list) { |
1263 | if (idx < s_idx) | |
1264 | goto cont; | |
1265 | if (idx > s_idx) | |
1266 | memset(&cb->args[1], 0, | |
1267 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1268 | if (!nft_is_active(net, chain)) | |
1269 | continue; | |
1270 | if (nf_tables_fill_chain_info(skb, net, | |
1271 | NETLINK_CB(cb->skb).portid, | |
1272 | cb->nlh->nlmsg_seq, | |
1273 | NFT_MSG_NEWCHAIN, | |
1274 | NLM_F_MULTI, | |
98319cb9 | 1275 | table->family, table, |
36596dad PNA |
1276 | chain) < 0) |
1277 | goto done; | |
38e029f1 | 1278 | |
36596dad | 1279 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
96518518 | 1280 | cont: |
36596dad | 1281 | idx++; |
96518518 PM |
1282 | } |
1283 | } | |
1284 | done: | |
e688a7f8 | 1285 | rcu_read_unlock(); |
96518518 PM |
1286 | cb->args[0] = idx; |
1287 | return skb->len; | |
1288 | } | |
1289 | ||
d9adf22a | 1290 | /* called with rcu_read_lock held */ |
7b8002a1 PNA |
1291 | static int nf_tables_getchain(struct net *net, struct sock *nlsk, |
1292 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1293 | const struct nlattr * const nla[], |
1294 | struct netlink_ext_ack *extack) | |
96518518 PM |
1295 | { |
1296 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1297 | u8 genmask = nft_genmask_cur(net); |
96518518 | 1298 | const struct nft_chain *chain; |
1b2470e5 | 1299 | struct nft_table *table; |
96518518 PM |
1300 | struct sk_buff *skb2; |
1301 | int family = nfmsg->nfgen_family; | |
1302 | int err; | |
1303 | ||
1304 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1305 | struct netlink_dump_control c = { | |
1306 | .dump = nf_tables_dump_chains, | |
d9adf22a | 1307 | .module = THIS_MODULE, |
96518518 | 1308 | }; |
d9adf22a FW |
1309 | |
1310 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); | |
96518518 PM |
1311 | } |
1312 | ||
cac20fcd | 1313 | table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask); |
36dd1bcc PNA |
1314 | if (IS_ERR(table)) { |
1315 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); | |
96518518 | 1316 | return PTR_ERR(table); |
36dd1bcc | 1317 | } |
96518518 | 1318 | |
f102d66b | 1319 | chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask); |
36dd1bcc PNA |
1320 | if (IS_ERR(chain)) { |
1321 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); | |
96518518 | 1322 | return PTR_ERR(chain); |
36dd1bcc | 1323 | } |
96518518 | 1324 | |
d9adf22a | 1325 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
96518518 PM |
1326 | if (!skb2) |
1327 | return -ENOMEM; | |
1328 | ||
84d7fce6 | 1329 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1330 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1331 | family, table, chain); | |
1332 | if (err < 0) | |
1333 | goto err; | |
1334 | ||
1335 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1336 | ||
1337 | err: | |
1338 | kfree_skb(skb2); | |
1339 | return err; | |
1340 | } | |
1341 | ||
0ca743a5 PNA |
1342 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1343 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1344 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1345 | }; | |
1346 | ||
ff3cd7b3 | 1347 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1348 | { |
1349 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1350 | struct nft_stats __percpu *newstats; | |
1351 | struct nft_stats *stats; | |
1352 | int err; | |
1353 | ||
fceb6435 JB |
1354 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy, |
1355 | NULL); | |
0ca743a5 | 1356 | if (err < 0) |
ff3cd7b3 | 1357 | return ERR_PTR(err); |
0ca743a5 PNA |
1358 | |
1359 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1360 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1361 | |
ce355e20 | 1362 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1363 | if (newstats == NULL) |
ff3cd7b3 | 1364 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1365 | |
1366 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1367 | * are not exposed to userspace. | |
1368 | */ | |
e8781f70 | 1369 | preempt_disable(); |
0ca743a5 PNA |
1370 | stats = this_cpu_ptr(newstats); |
1371 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1372 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1373 | preempt_enable(); |
0ca743a5 | 1374 | |
ff3cd7b3 PNA |
1375 | return newstats; |
1376 | } | |
1377 | ||
1378 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
1379 | struct nft_stats __percpu *newstats) | |
1380 | { | |
0befd061 PNA |
1381 | struct nft_stats __percpu *oldstats; |
1382 | ||
b88825de PNA |
1383 | if (newstats == NULL) |
1384 | return; | |
1385 | ||
0ca743a5 | 1386 | if (chain->stats) { |
0befd061 | 1387 | oldstats = nfnl_dereference(chain->stats, NFNL_SUBSYS_NFTABLES); |
0ca743a5 PNA |
1388 | rcu_assign_pointer(chain->stats, newstats); |
1389 | synchronize_rcu(); | |
1390 | free_percpu(oldstats); | |
bbb8c61f | 1391 | } else { |
0ca743a5 | 1392 | rcu_assign_pointer(chain->stats, newstats); |
bbb8c61f TY |
1393 | static_branch_inc(&nft_counters_enabled); |
1394 | } | |
0ca743a5 PNA |
1395 | } |
1396 | ||
0cbc06b3 FW |
1397 | static void nf_tables_chain_free_chain_rules(struct nft_chain *chain) |
1398 | { | |
1399 | struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0); | |
1400 | struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1); | |
1401 | ||
1402 | if (g0 != g1) | |
1403 | kvfree(g1); | |
1404 | kvfree(g0); | |
1405 | ||
1406 | /* should be NULL either via abort or via successful commit */ | |
1407 | WARN_ON_ONCE(chain->rules_next); | |
1408 | kvfree(chain->rules_next); | |
1409 | } | |
1410 | ||
43a605f2 | 1411 | static void nf_tables_chain_destroy(struct nft_ctx *ctx) |
91c7b38d | 1412 | { |
43a605f2 PNA |
1413 | struct nft_chain *chain = ctx->chain; |
1414 | ||
91c7b38d PNA |
1415 | BUG_ON(chain->use > 0); |
1416 | ||
0cbc06b3 FW |
1417 | /* no concurrent access possible anymore */ |
1418 | nf_tables_chain_free_chain_rules(chain); | |
1419 | ||
f323d954 | 1420 | if (nft_is_base_chain(chain)) { |
2cbce139 PNA |
1421 | struct nft_base_chain *basechain = nft_base_chain(chain); |
1422 | ||
1423 | module_put(basechain->type->owner); | |
1424 | free_percpu(basechain->stats); | |
9f08ea84 PNA |
1425 | if (basechain->stats) |
1426 | static_branch_dec(&nft_counters_enabled); | |
b7263e07 | 1427 | kfree(chain->name); |
2cbce139 | 1428 | kfree(basechain); |
91c7b38d | 1429 | } else { |
b7263e07 | 1430 | kfree(chain->name); |
91c7b38d PNA |
1431 | kfree(chain); |
1432 | } | |
1433 | } | |
1434 | ||
508f8ccd PNA |
1435 | struct nft_chain_hook { |
1436 | u32 num; | |
84ba7dd7 | 1437 | s32 priority; |
32537e91 | 1438 | const struct nft_chain_type *type; |
508f8ccd PNA |
1439 | struct net_device *dev; |
1440 | }; | |
1441 | ||
1442 | static int nft_chain_parse_hook(struct net *net, | |
1443 | const struct nlattr * const nla[], | |
36596dad | 1444 | struct nft_chain_hook *hook, u8 family, |
445509eb | 1445 | bool autoload) |
508f8ccd PNA |
1446 | { |
1447 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; | |
32537e91 | 1448 | const struct nft_chain_type *type; |
508f8ccd PNA |
1449 | struct net_device *dev; |
1450 | int err; | |
1451 | ||
f102d66b FW |
1452 | lockdep_assert_held(&net->nft.commit_mutex); |
1453 | lockdep_nfnl_nft_mutex_not_held(); | |
1454 | ||
508f8ccd | 1455 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], |
fceb6435 | 1456 | nft_hook_policy, NULL); |
508f8ccd PNA |
1457 | if (err < 0) |
1458 | return err; | |
1459 | ||
1460 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1461 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1462 | return -EINVAL; | |
1463 | ||
1464 | hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
508f8ccd PNA |
1465 | hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
1466 | ||
36596dad | 1467 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
508f8ccd | 1468 | if (nla[NFTA_CHAIN_TYPE]) { |
452238e8 | 1469 | type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE], |
445509eb | 1470 | family, autoload); |
508f8ccd PNA |
1471 | if (IS_ERR(type)) |
1472 | return PTR_ERR(type); | |
1473 | } | |
1474 | if (!(type->hook_mask & (1 << hook->num))) | |
1475 | return -EOPNOTSUPP; | |
84ba7dd7 FW |
1476 | |
1477 | if (type->type == NFT_CHAIN_T_NAT && | |
1478 | hook->priority <= NF_IP_PRI_CONNTRACK) | |
1479 | return -EOPNOTSUPP; | |
1480 | ||
508f8ccd PNA |
1481 | if (!try_module_get(type->owner)) |
1482 | return -ENOENT; | |
1483 | ||
1484 | hook->type = type; | |
1485 | ||
1486 | hook->dev = NULL; | |
36596dad | 1487 | if (family == NFPROTO_NETDEV) { |
508f8ccd PNA |
1488 | char ifname[IFNAMSIZ]; |
1489 | ||
1490 | if (!ha[NFTA_HOOK_DEV]) { | |
1491 | module_put(type->owner); | |
1492 | return -EOPNOTSUPP; | |
1493 | } | |
1494 | ||
1495 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); | |
90d2723c | 1496 | dev = __dev_get_by_name(net, ifname); |
508f8ccd PNA |
1497 | if (!dev) { |
1498 | module_put(type->owner); | |
1499 | return -ENOENT; | |
1500 | } | |
1501 | hook->dev = dev; | |
1502 | } else if (ha[NFTA_HOOK_DEV]) { | |
1503 | module_put(type->owner); | |
1504 | return -EOPNOTSUPP; | |
1505 | } | |
1506 | ||
1507 | return 0; | |
1508 | } | |
1509 | ||
1510 | static void nft_chain_release_hook(struct nft_chain_hook *hook) | |
1511 | { | |
1512 | module_put(hook->type->owner); | |
508f8ccd PNA |
1513 | } |
1514 | ||
0cbc06b3 FW |
1515 | struct nft_rules_old { |
1516 | struct rcu_head h; | |
1517 | struct nft_rule **start; | |
1518 | }; | |
1519 | ||
1520 | static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain, | |
1521 | unsigned int alloc) | |
1522 | { | |
1523 | if (alloc > INT_MAX) | |
1524 | return NULL; | |
1525 | ||
1526 | alloc += 1; /* NULL, ends rules */ | |
1527 | if (sizeof(struct nft_rule *) > INT_MAX / alloc) | |
1528 | return NULL; | |
1529 | ||
1530 | alloc *= sizeof(struct nft_rule *); | |
1531 | alloc += sizeof(struct nft_rules_old); | |
1532 | ||
1533 | return kvmalloc(alloc, GFP_KERNEL); | |
1534 | } | |
1535 | ||
4035285f | 1536 | static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask, |
445509eb | 1537 | u8 policy) |
4035285f PNA |
1538 | { |
1539 | const struct nlattr * const *nla = ctx->nla; | |
1540 | struct nft_table *table = ctx->table; | |
4035285f PNA |
1541 | struct nft_base_chain *basechain; |
1542 | struct nft_stats __percpu *stats; | |
1543 | struct net *net = ctx->net; | |
1544 | struct nft_chain *chain; | |
0cbc06b3 | 1545 | struct nft_rule **rules; |
4035285f PNA |
1546 | int err; |
1547 | ||
1548 | if (table->use == UINT_MAX) | |
1549 | return -EOVERFLOW; | |
1550 | ||
1551 | if (nla[NFTA_CHAIN_HOOK]) { | |
1552 | struct nft_chain_hook hook; | |
1553 | struct nf_hook_ops *ops; | |
4035285f | 1554 | |
445509eb | 1555 | err = nft_chain_parse_hook(net, nla, &hook, family, true); |
4035285f PNA |
1556 | if (err < 0) |
1557 | return err; | |
1558 | ||
1559 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); | |
1560 | if (basechain == NULL) { | |
1561 | nft_chain_release_hook(&hook); | |
1562 | return -ENOMEM; | |
1563 | } | |
1564 | ||
1565 | if (hook.dev != NULL) | |
1566 | strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ); | |
1567 | ||
1568 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1569 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1570 | if (IS_ERR(stats)) { | |
1571 | nft_chain_release_hook(&hook); | |
1572 | kfree(basechain); | |
1573 | return PTR_ERR(stats); | |
1574 | } | |
1575 | basechain->stats = stats; | |
1576 | static_branch_inc(&nft_counters_enabled); | |
1577 | } | |
1578 | ||
4035285f PNA |
1579 | basechain->type = hook.type; |
1580 | chain = &basechain->chain; | |
1581 | ||
c974a3a3 PNA |
1582 | ops = &basechain->ops; |
1583 | ops->pf = family; | |
1584 | ops->hooknum = hook.num; | |
1585 | ops->priority = hook.priority; | |
1586 | ops->priv = chain; | |
c2f9eafe | 1587 | ops->hook = hook.type->hooks[ops->hooknum]; |
c974a3a3 | 1588 | ops->dev = hook.dev; |
c974a3a3 | 1589 | |
4035285f PNA |
1590 | chain->flags |= NFT_BASE_CHAIN; |
1591 | basechain->policy = policy; | |
1592 | } else { | |
1593 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1594 | if (chain == NULL) | |
1595 | return -ENOMEM; | |
1596 | } | |
43a605f2 PNA |
1597 | ctx->chain = chain; |
1598 | ||
4035285f PNA |
1599 | INIT_LIST_HEAD(&chain->rules); |
1600 | chain->handle = nf_tables_alloc_handle(table); | |
1601 | chain->table = table; | |
1602 | chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL); | |
1603 | if (!chain->name) { | |
1604 | err = -ENOMEM; | |
1605 | goto err1; | |
1606 | } | |
1607 | ||
0cbc06b3 FW |
1608 | rules = nf_tables_chain_alloc_rules(chain, 0); |
1609 | if (!rules) { | |
1610 | err = -ENOMEM; | |
1611 | goto err1; | |
1612 | } | |
1613 | ||
1614 | *rules = NULL; | |
1615 | rcu_assign_pointer(chain->rules_gen_0, rules); | |
1616 | rcu_assign_pointer(chain->rules_gen_1, rules); | |
1617 | ||
c974a3a3 | 1618 | err = nf_tables_register_hook(net, table, chain); |
4035285f PNA |
1619 | if (err < 0) |
1620 | goto err1; | |
1621 | ||
1b2470e5 FW |
1622 | err = rhltable_insert_key(&table->chains_ht, chain->name, |
1623 | &chain->rhlhead, nft_chain_ht_params); | |
1624 | if (err) | |
1625 | goto err2; | |
1626 | ||
4035285f | 1627 | err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN); |
1b2470e5 FW |
1628 | if (err < 0) { |
1629 | rhltable_remove(&table->chains_ht, &chain->rhlhead, | |
1630 | nft_chain_ht_params); | |
4035285f | 1631 | goto err2; |
1b2470e5 | 1632 | } |
4035285f PNA |
1633 | |
1634 | table->use++; | |
1635 | list_add_tail_rcu(&chain->list, &table->chains); | |
1636 | ||
1637 | return 0; | |
1638 | err2: | |
c974a3a3 | 1639 | nf_tables_unregister_hook(net, table, chain); |
4035285f | 1640 | err1: |
43a605f2 | 1641 | nf_tables_chain_destroy(ctx); |
4035285f PNA |
1642 | |
1643 | return err; | |
1644 | } | |
1645 | ||
445509eb | 1646 | static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy) |
2c4a488a PNA |
1647 | { |
1648 | const struct nlattr * const *nla = ctx->nla; | |
1649 | struct nft_table *table = ctx->table; | |
1650 | struct nft_chain *chain = ctx->chain; | |
2c4a488a PNA |
1651 | struct nft_base_chain *basechain; |
1652 | struct nft_stats *stats = NULL; | |
1653 | struct nft_chain_hook hook; | |
2c4a488a PNA |
1654 | struct nf_hook_ops *ops; |
1655 | struct nft_trans *trans; | |
c974a3a3 | 1656 | int err; |
2c4a488a PNA |
1657 | |
1658 | if (nla[NFTA_CHAIN_HOOK]) { | |
1659 | if (!nft_is_base_chain(chain)) | |
1660 | return -EBUSY; | |
1661 | ||
36596dad | 1662 | err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family, |
445509eb | 1663 | false); |
2c4a488a PNA |
1664 | if (err < 0) |
1665 | return err; | |
1666 | ||
1667 | basechain = nft_base_chain(chain); | |
1668 | if (basechain->type != hook.type) { | |
1669 | nft_chain_release_hook(&hook); | |
1670 | return -EBUSY; | |
1671 | } | |
1672 | ||
c974a3a3 PNA |
1673 | ops = &basechain->ops; |
1674 | if (ops->hooknum != hook.num || | |
1675 | ops->priority != hook.priority || | |
1676 | ops->dev != hook.dev) { | |
1677 | nft_chain_release_hook(&hook); | |
1678 | return -EBUSY; | |
2c4a488a PNA |
1679 | } |
1680 | nft_chain_release_hook(&hook); | |
1681 | } | |
1682 | ||
1683 | if (nla[NFTA_CHAIN_HANDLE] && | |
1684 | nla[NFTA_CHAIN_NAME]) { | |
1685 | struct nft_chain *chain2; | |
1686 | ||
f102d66b FW |
1687 | chain2 = nft_chain_lookup(ctx->net, table, |
1688 | nla[NFTA_CHAIN_NAME], genmask); | |
0d18779b JC |
1689 | if (!IS_ERR(chain2)) |
1690 | return -EEXIST; | |
2c4a488a PNA |
1691 | } |
1692 | ||
1693 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1694 | if (!nft_is_base_chain(chain)) | |
1695 | return -EOPNOTSUPP; | |
1696 | ||
1697 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1698 | if (IS_ERR(stats)) | |
1699 | return PTR_ERR(stats); | |
1700 | } | |
1701 | ||
c6cc94df | 1702 | err = -ENOMEM; |
2c4a488a PNA |
1703 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, |
1704 | sizeof(struct nft_trans_chain)); | |
c6cc94df FW |
1705 | if (trans == NULL) |
1706 | goto err; | |
2c4a488a PNA |
1707 | |
1708 | nft_trans_chain_stats(trans) = stats; | |
1709 | nft_trans_chain_update(trans) = true; | |
1710 | ||
1711 | if (nla[NFTA_CHAIN_POLICY]) | |
1712 | nft_trans_chain_policy(trans) = policy; | |
1713 | else | |
1714 | nft_trans_chain_policy(trans) = -1; | |
1715 | ||
c6cc94df FW |
1716 | if (nla[NFTA_CHAIN_HANDLE] && |
1717 | nla[NFTA_CHAIN_NAME]) { | |
1718 | struct nft_trans *tmp; | |
1719 | char *name; | |
1720 | ||
1721 | err = -ENOMEM; | |
1722 | name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL); | |
1723 | if (!name) | |
1724 | goto err; | |
1725 | ||
1726 | err = -EEXIST; | |
1727 | list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) { | |
1728 | if (tmp->msg_type == NFT_MSG_NEWCHAIN && | |
1729 | tmp->ctx.table == table && | |
1730 | nft_trans_chain_update(tmp) && | |
1731 | nft_trans_chain_name(tmp) && | |
1732 | strcmp(name, nft_trans_chain_name(tmp)) == 0) { | |
1733 | kfree(name); | |
1734 | goto err; | |
1735 | } | |
2c4a488a | 1736 | } |
c6cc94df FW |
1737 | |
1738 | nft_trans_chain_name(trans) = name; | |
2c4a488a PNA |
1739 | } |
1740 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
1741 | ||
1742 | return 0; | |
c6cc94df FW |
1743 | err: |
1744 | free_percpu(stats); | |
1745 | kfree(trans); | |
1746 | return err; | |
2c4a488a PNA |
1747 | } |
1748 | ||
633c9a84 PNA |
1749 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
1750 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1751 | const struct nlattr * const nla[], |
1752 | struct netlink_ext_ack *extack) | |
96518518 PM |
1753 | { |
1754 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4035285f PNA |
1755 | u8 genmask = nft_genmask_next(net); |
1756 | int family = nfmsg->nfgen_family; | |
36dd1bcc | 1757 | const struct nlattr *attr; |
96518518 PM |
1758 | struct nft_table *table; |
1759 | struct nft_chain *chain; | |
57de2a0c | 1760 | u8 policy = NF_ACCEPT; |
4035285f | 1761 | struct nft_ctx ctx; |
96518518 | 1762 | u64 handle = 0; |
96518518 | 1763 | |
f102d66b FW |
1764 | lockdep_assert_held(&net->nft.commit_mutex); |
1765 | ||
cac20fcd | 1766 | table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask); |
36dd1bcc PNA |
1767 | if (IS_ERR(table)) { |
1768 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); | |
96518518 | 1769 | return PTR_ERR(table); |
36dd1bcc | 1770 | } |
96518518 | 1771 | |
96518518 | 1772 | chain = NULL; |
36dd1bcc | 1773 | attr = nla[NFTA_CHAIN_NAME]; |
96518518 PM |
1774 | |
1775 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1776 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
cac20fcd | 1777 | chain = nft_chain_lookup_byhandle(table, handle, genmask); |
36dd1bcc PNA |
1778 | if (IS_ERR(chain)) { |
1779 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]); | |
96518518 | 1780 | return PTR_ERR(chain); |
36dd1bcc PNA |
1781 | } |
1782 | attr = nla[NFTA_CHAIN_HANDLE]; | |
96518518 | 1783 | } else { |
f102d66b | 1784 | chain = nft_chain_lookup(net, table, attr, genmask); |
96518518 | 1785 | if (IS_ERR(chain)) { |
36dd1bcc PNA |
1786 | if (PTR_ERR(chain) != -ENOENT) { |
1787 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 1788 | return PTR_ERR(chain); |
36dd1bcc | 1789 | } |
96518518 PM |
1790 | chain = NULL; |
1791 | } | |
1792 | } | |
1793 | ||
57de2a0c | 1794 | if (nla[NFTA_CHAIN_POLICY]) { |
f323d954 | 1795 | if (chain != NULL && |
36dd1bcc PNA |
1796 | !nft_is_base_chain(chain)) { |
1797 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); | |
d6b6cb1d | 1798 | return -EOPNOTSUPP; |
36dd1bcc | 1799 | } |
d6b6cb1d PNA |
1800 | |
1801 | if (chain == NULL && | |
36dd1bcc PNA |
1802 | nla[NFTA_CHAIN_HOOK] == NULL) { |
1803 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); | |
57de2a0c | 1804 | return -EOPNOTSUPP; |
36dd1bcc | 1805 | } |
57de2a0c | 1806 | |
8f46df18 | 1807 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1808 | switch (policy) { |
1809 | case NF_DROP: | |
1810 | case NF_ACCEPT: | |
1811 | break; | |
1812 | default: | |
1813 | return -EINVAL; | |
1814 | } | |
1815 | } | |
1816 | ||
98319cb9 | 1817 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
4035285f | 1818 | |
96518518 | 1819 | if (chain != NULL) { |
36dd1bcc PNA |
1820 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
1821 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 1822 | return -EEXIST; |
36dd1bcc | 1823 | } |
96518518 PM |
1824 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
1825 | return -EOPNOTSUPP; | |
1826 | ||
445509eb | 1827 | return nf_tables_updchain(&ctx, genmask, policy); |
96518518 PM |
1828 | } |
1829 | ||
445509eb | 1830 | return nf_tables_addchain(&ctx, family, genmask, policy); |
96518518 PM |
1831 | } |
1832 | ||
633c9a84 PNA |
1833 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
1834 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1835 | const struct nlattr * const nla[], |
1836 | struct netlink_ext_ack *extack) | |
96518518 PM |
1837 | { |
1838 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1839 | u8 genmask = nft_genmask_next(net); |
36dd1bcc PNA |
1840 | int family = nfmsg->nfgen_family; |
1841 | const struct nlattr *attr; | |
96518518 PM |
1842 | struct nft_table *table; |
1843 | struct nft_chain *chain; | |
9dee1474 | 1844 | struct nft_rule *rule; |
91c7b38d | 1845 | struct nft_ctx ctx; |
3ecbfd65 | 1846 | u64 handle; |
9dee1474 PNA |
1847 | u32 use; |
1848 | int err; | |
96518518 | 1849 | |
cac20fcd | 1850 | table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask); |
36dd1bcc PNA |
1851 | if (IS_ERR(table)) { |
1852 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); | |
96518518 | 1853 | return PTR_ERR(table); |
36dd1bcc | 1854 | } |
96518518 | 1855 | |
3ecbfd65 | 1856 | if (nla[NFTA_CHAIN_HANDLE]) { |
36dd1bcc PNA |
1857 | attr = nla[NFTA_CHAIN_HANDLE]; |
1858 | handle = be64_to_cpu(nla_get_be64(attr)); | |
cac20fcd | 1859 | chain = nft_chain_lookup_byhandle(table, handle, genmask); |
3ecbfd65 | 1860 | } else { |
36dd1bcc | 1861 | attr = nla[NFTA_CHAIN_NAME]; |
f102d66b | 1862 | chain = nft_chain_lookup(net, table, attr, genmask); |
3ecbfd65 | 1863 | } |
36dd1bcc PNA |
1864 | if (IS_ERR(chain)) { |
1865 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 1866 | return PTR_ERR(chain); |
36dd1bcc | 1867 | } |
9dee1474 PNA |
1868 | |
1869 | if (nlh->nlmsg_flags & NLM_F_NONREC && | |
1870 | chain->use > 0) | |
96518518 PM |
1871 | return -EBUSY; |
1872 | ||
98319cb9 | 1873 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0165d932 | 1874 | |
9dee1474 PNA |
1875 | use = chain->use; |
1876 | list_for_each_entry(rule, &chain->rules, list) { | |
1877 | if (!nft_is_active_next(net, rule)) | |
1878 | continue; | |
1879 | use--; | |
1880 | ||
1881 | err = nft_delrule(&ctx, rule); | |
1882 | if (err < 0) | |
1883 | return err; | |
1884 | } | |
1885 | ||
1886 | /* There are rules and elements that are still holding references to us, | |
1887 | * we cannot do a recursive removal in this case. | |
1888 | */ | |
36dd1bcc PNA |
1889 | if (use > 0) { |
1890 | NL_SET_BAD_ATTR(extack, attr); | |
9dee1474 | 1891 | return -EBUSY; |
36dd1bcc | 1892 | } |
9dee1474 | 1893 | |
ee01d542 | 1894 | return nft_delchain(&ctx); |
96518518 PM |
1895 | } |
1896 | ||
96518518 PM |
1897 | /* |
1898 | * Expressions | |
1899 | */ | |
1900 | ||
1901 | /** | |
ef1f7df9 PM |
1902 | * nft_register_expr - register nf_tables expr type |
1903 | * @ops: expr type | |
96518518 | 1904 | * |
ef1f7df9 | 1905 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1906 | * success or a negative errno code otherwise. |
1907 | */ | |
ef1f7df9 | 1908 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1909 | { |
1910 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1911 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1912 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1913 | else |
e688a7f8 | 1914 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1915 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1916 | return 0; | |
1917 | } | |
1918 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1919 | ||
1920 | /** | |
ef1f7df9 PM |
1921 | * nft_unregister_expr - unregister nf_tables expr type |
1922 | * @ops: expr type | |
96518518 | 1923 | * |
ef1f7df9 | 1924 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1925 | */ |
ef1f7df9 | 1926 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1927 | { |
1928 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1929 | list_del_rcu(&type->list); |
96518518 PM |
1930 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1931 | } | |
1932 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1933 | ||
64d46806 PM |
1934 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1935 | struct nlattr *nla) | |
96518518 | 1936 | { |
ef1f7df9 | 1937 | const struct nft_expr_type *type; |
96518518 | 1938 | |
ef1f7df9 | 1939 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1940 | if (!nla_strcmp(nla, type->name) && |
1941 | (!type->family || type->family == family)) | |
ef1f7df9 | 1942 | return type; |
96518518 PM |
1943 | } |
1944 | return NULL; | |
1945 | } | |
1946 | ||
452238e8 FW |
1947 | static const struct nft_expr_type *nft_expr_type_get(struct net *net, |
1948 | u8 family, | |
64d46806 | 1949 | struct nlattr *nla) |
96518518 | 1950 | { |
ef1f7df9 | 1951 | const struct nft_expr_type *type; |
96518518 PM |
1952 | |
1953 | if (nla == NULL) | |
1954 | return ERR_PTR(-EINVAL); | |
1955 | ||
64d46806 | 1956 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1957 | if (type != NULL && try_module_get(type->owner)) |
1958 | return type; | |
96518518 | 1959 | |
f102d66b | 1960 | lockdep_nfnl_nft_mutex_not_held(); |
96518518 | 1961 | #ifdef CONFIG_MODULES |
ef1f7df9 | 1962 | if (type == NULL) { |
452238e8 FW |
1963 | nft_request_module(net, "nft-expr-%u-%.*s", family, |
1964 | nla_len(nla), (char *)nla_data(nla)); | |
64d46806 PM |
1965 | if (__nft_expr_type_get(family, nla)) |
1966 | return ERR_PTR(-EAGAIN); | |
1967 | ||
452238e8 FW |
1968 | nft_request_module(net, "nft-expr-%.*s", |
1969 | nla_len(nla), (char *)nla_data(nla)); | |
64d46806 | 1970 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1971 | return ERR_PTR(-EAGAIN); |
1972 | } | |
1973 | #endif | |
1974 | return ERR_PTR(-ENOENT); | |
1975 | } | |
1976 | ||
1977 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1978 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1979 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1980 | }; | |
1981 | ||
1982 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1983 | const struct nft_expr *expr) | |
1984 | { | |
ef1f7df9 | 1985 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1986 | goto nla_put_failure; |
1987 | ||
1988 | if (expr->ops->dump) { | |
1989 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1990 | if (data == NULL) | |
1991 | goto nla_put_failure; | |
1992 | if (expr->ops->dump(skb, expr) < 0) | |
1993 | goto nla_put_failure; | |
1994 | nla_nest_end(skb, data); | |
1995 | } | |
1996 | ||
1997 | return skb->len; | |
1998 | ||
1999 | nla_put_failure: | |
2000 | return -1; | |
2001 | }; | |
2002 | ||
0b2d8a7b PM |
2003 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
2004 | const struct nft_expr *expr) | |
2005 | { | |
2006 | struct nlattr *nest; | |
2007 | ||
2008 | nest = nla_nest_start(skb, attr); | |
2009 | if (!nest) | |
2010 | goto nla_put_failure; | |
2011 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
2012 | goto nla_put_failure; | |
2013 | nla_nest_end(skb, nest); | |
2014 | return 0; | |
2015 | ||
2016 | nla_put_failure: | |
2017 | return -1; | |
2018 | } | |
2019 | ||
96518518 PM |
2020 | struct nft_expr_info { |
2021 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 2022 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
2023 | }; |
2024 | ||
0ca743a5 PNA |
2025 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
2026 | const struct nlattr *nla, | |
96518518 PM |
2027 | struct nft_expr_info *info) |
2028 | { | |
ef1f7df9 | 2029 | const struct nft_expr_type *type; |
96518518 | 2030 | const struct nft_expr_ops *ops; |
ef1f7df9 | 2031 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
2032 | int err; |
2033 | ||
fceb6435 | 2034 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL); |
96518518 PM |
2035 | if (err < 0) |
2036 | return err; | |
2037 | ||
452238e8 | 2038 | type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
2039 | if (IS_ERR(type)) |
2040 | return PTR_ERR(type); | |
2041 | ||
2042 | if (tb[NFTA_EXPR_DATA]) { | |
2043 | err = nla_parse_nested(info->tb, type->maxattr, | |
fceb6435 | 2044 | tb[NFTA_EXPR_DATA], type->policy, NULL); |
ef1f7df9 PM |
2045 | if (err < 0) |
2046 | goto err1; | |
2047 | } else | |
2048 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
2049 | ||
2050 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
2051 | ops = type->select_ops(ctx, |
2052 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
2053 | if (IS_ERR(ops)) { |
2054 | err = PTR_ERR(ops); | |
2055 | goto err1; | |
2056 | } | |
2057 | } else | |
2058 | ops = type->ops; | |
2059 | ||
96518518 PM |
2060 | info->ops = ops; |
2061 | return 0; | |
ef1f7df9 PM |
2062 | |
2063 | err1: | |
2064 | module_put(type->owner); | |
2065 | return err; | |
96518518 PM |
2066 | } |
2067 | ||
2068 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 2069 | const struct nft_expr_info *info, |
96518518 PM |
2070 | struct nft_expr *expr) |
2071 | { | |
2072 | const struct nft_expr_ops *ops = info->ops; | |
2073 | int err; | |
2074 | ||
2075 | expr->ops = ops; | |
2076 | if (ops->init) { | |
ef1f7df9 | 2077 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
2078 | if (err < 0) |
2079 | goto err1; | |
2080 | } | |
2081 | ||
96518518 | 2082 | return 0; |
96518518 PM |
2083 | err1: |
2084 | expr->ops = NULL; | |
2085 | return err; | |
2086 | } | |
2087 | ||
62472bce PM |
2088 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
2089 | struct nft_expr *expr) | |
96518518 PM |
2090 | { |
2091 | if (expr->ops->destroy) | |
62472bce | 2092 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 2093 | module_put(expr->ops->type->owner); |
96518518 PM |
2094 | } |
2095 | ||
0b2d8a7b PM |
2096 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
2097 | const struct nlattr *nla) | |
2098 | { | |
2099 | struct nft_expr_info info; | |
2100 | struct nft_expr *expr; | |
2101 | int err; | |
2102 | ||
2103 | err = nf_tables_expr_parse(ctx, nla, &info); | |
2104 | if (err < 0) | |
2105 | goto err1; | |
2106 | ||
2107 | err = -ENOMEM; | |
2108 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
2109 | if (expr == NULL) | |
2110 | goto err2; | |
2111 | ||
2112 | err = nf_tables_newexpr(ctx, &info, expr); | |
2113 | if (err < 0) | |
6cafaf47 | 2114 | goto err3; |
0b2d8a7b PM |
2115 | |
2116 | return expr; | |
6cafaf47 LZ |
2117 | err3: |
2118 | kfree(expr); | |
0b2d8a7b PM |
2119 | err2: |
2120 | module_put(info.ops->type->owner); | |
2121 | err1: | |
2122 | return ERR_PTR(err); | |
2123 | } | |
2124 | ||
2125 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
2126 | { | |
2127 | nf_tables_expr_destroy(ctx, expr); | |
2128 | kfree(expr); | |
2129 | } | |
2130 | ||
96518518 PM |
2131 | /* |
2132 | * Rules | |
2133 | */ | |
2134 | ||
cac20fcd PNA |
2135 | static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain, |
2136 | u64 handle) | |
96518518 PM |
2137 | { |
2138 | struct nft_rule *rule; | |
2139 | ||
2140 | // FIXME: this sucks | |
d9adf22a | 2141 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
96518518 PM |
2142 | if (handle == rule->handle) |
2143 | return rule; | |
2144 | } | |
2145 | ||
2146 | return ERR_PTR(-ENOENT); | |
2147 | } | |
2148 | ||
cac20fcd PNA |
2149 | static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain, |
2150 | const struct nlattr *nla) | |
96518518 PM |
2151 | { |
2152 | if (nla == NULL) | |
2153 | return ERR_PTR(-EINVAL); | |
2154 | ||
cac20fcd | 2155 | return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); |
96518518 PM |
2156 | } |
2157 | ||
2158 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
b2fbd044 LZ |
2159 | [NFTA_RULE_TABLE] = { .type = NLA_STRING, |
2160 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
2161 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
2162 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
2163 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
2164 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 2165 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 2166 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
2167 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
2168 | .len = NFT_USERDATA_MAXLEN }, | |
467697d2 | 2169 | [NFTA_RULE_ID] = { .type = NLA_U32 }, |
96518518 PM |
2170 | }; |
2171 | ||
84d7fce6 PNA |
2172 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
2173 | u32 portid, u32 seq, int event, | |
2174 | u32 flags, int family, | |
96518518 PM |
2175 | const struct nft_table *table, |
2176 | const struct nft_chain *chain, | |
2177 | const struct nft_rule *rule) | |
2178 | { | |
2179 | struct nlmsghdr *nlh; | |
2180 | struct nfgenmsg *nfmsg; | |
2181 | const struct nft_expr *expr, *next; | |
2182 | struct nlattr *list; | |
5e948466 | 2183 | const struct nft_rule *prule; |
dedb67c4 | 2184 | u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 | 2185 | |
dedb67c4 | 2186 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags); |
96518518 PM |
2187 | if (nlh == NULL) |
2188 | goto nla_put_failure; | |
2189 | ||
2190 | nfmsg = nlmsg_data(nlh); | |
2191 | nfmsg->nfgen_family = family; | |
2192 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2193 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
2194 | |
2195 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
2196 | goto nla_put_failure; | |
2197 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
2198 | goto nla_put_failure; | |
b46f6ded ND |
2199 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), |
2200 | NFTA_RULE_PAD)) | |
96518518 PM |
2201 | goto nla_put_failure; |
2202 | ||
5e948466 | 2203 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
cbbb40e2 | 2204 | prule = list_prev_entry(rule, list); |
5e948466 | 2205 | if (nla_put_be64(skb, NFTA_RULE_POSITION, |
b46f6ded ND |
2206 | cpu_to_be64(prule->handle), |
2207 | NFTA_RULE_PAD)) | |
5e948466 EL |
2208 | goto nla_put_failure; |
2209 | } | |
2210 | ||
96518518 PM |
2211 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
2212 | if (list == NULL) | |
2213 | goto nla_put_failure; | |
2214 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 2215 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 2216 | goto nla_put_failure; |
96518518 PM |
2217 | } |
2218 | nla_nest_end(skb, list); | |
2219 | ||
86f1ec32 PM |
2220 | if (rule->udata) { |
2221 | struct nft_userdata *udata = nft_userdata(rule); | |
2222 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
2223 | udata->data) < 0) | |
2224 | goto nla_put_failure; | |
2225 | } | |
0768b3b3 | 2226 | |
053c095a JB |
2227 | nlmsg_end(skb, nlh); |
2228 | return 0; | |
96518518 PM |
2229 | |
2230 | nla_put_failure: | |
2231 | nlmsg_trim(skb, nlh); | |
2232 | return -1; | |
2233 | } | |
2234 | ||
25e94a99 PNA |
2235 | static void nf_tables_rule_notify(const struct nft_ctx *ctx, |
2236 | const struct nft_rule *rule, int event) | |
96518518 PM |
2237 | { |
2238 | struct sk_buff *skb; | |
96518518 PM |
2239 | int err; |
2240 | ||
128ad332 PNA |
2241 | if (!ctx->report && |
2242 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 2243 | return; |
96518518 | 2244 | |
96518518 PM |
2245 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
2246 | if (skb == NULL) | |
2247 | goto err; | |
2248 | ||
84d7fce6 | 2249 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 2250 | event, 0, ctx->family, ctx->table, |
35151d84 | 2251 | ctx->chain, rule); |
96518518 PM |
2252 | if (err < 0) { |
2253 | kfree_skb(skb); | |
2254 | goto err; | |
2255 | } | |
2256 | ||
25e94a99 PNA |
2257 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
2258 | ctx->report, GFP_KERNEL); | |
2259 | return; | |
96518518 | 2260 | err: |
25e94a99 | 2261 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
2262 | } |
2263 | ||
6e1f760e | 2264 | struct nft_rule_dump_ctx { |
e46abbcc | 2265 | char *table; |
b7263e07 | 2266 | char *chain; |
6e1f760e PNA |
2267 | }; |
2268 | ||
96518518 PM |
2269 | static int nf_tables_dump_rules(struct sk_buff *skb, |
2270 | struct netlink_callback *cb) | |
2271 | { | |
2272 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
6e1f760e | 2273 | const struct nft_rule_dump_ctx *ctx = cb->data; |
96518518 PM |
2274 | const struct nft_table *table; |
2275 | const struct nft_chain *chain; | |
2276 | const struct nft_rule *rule; | |
2277 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 2278 | struct net *net = sock_net(skb->sk); |
96518518 PM |
2279 | int family = nfmsg->nfgen_family; |
2280 | ||
e688a7f8 | 2281 | rcu_read_lock(); |
38e029f1 PNA |
2282 | cb->seq = net->nft.base_seq; |
2283 | ||
36596dad | 2284 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 2285 | if (family != NFPROTO_UNSPEC && family != table->family) |
36596dad PNA |
2286 | continue; |
2287 | ||
2288 | if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0) | |
96518518 PM |
2289 | continue; |
2290 | ||
36596dad PNA |
2291 | list_for_each_entry_rcu(chain, &table->chains, list) { |
2292 | if (ctx && ctx->chain && | |
2293 | strcmp(ctx->chain, chain->name) != 0) | |
6e1f760e PNA |
2294 | continue; |
2295 | ||
36596dad PNA |
2296 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
2297 | if (!nft_is_active(net, rule)) | |
2298 | goto cont; | |
2299 | if (idx < s_idx) | |
2300 | goto cont; | |
2301 | if (idx > s_idx) | |
2302 | memset(&cb->args[1], 0, | |
2303 | sizeof(cb->args) - sizeof(cb->args[0])); | |
2304 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, | |
2305 | cb->nlh->nlmsg_seq, | |
2306 | NFT_MSG_NEWRULE, | |
2307 | NLM_F_MULTI | NLM_F_APPEND, | |
98319cb9 | 2308 | table->family, |
36596dad PNA |
2309 | table, chain, rule) < 0) |
2310 | goto done; | |
2311 | ||
2312 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 | 2313 | cont: |
36596dad | 2314 | idx++; |
96518518 PM |
2315 | } |
2316 | } | |
2317 | } | |
2318 | done: | |
e688a7f8 PNA |
2319 | rcu_read_unlock(); |
2320 | ||
96518518 PM |
2321 | cb->args[0] = idx; |
2322 | return skb->len; | |
2323 | } | |
2324 | ||
90fd131a FW |
2325 | static int nf_tables_dump_rules_start(struct netlink_callback *cb) |
2326 | { | |
2327 | const struct nlattr * const *nla = cb->data; | |
2328 | struct nft_rule_dump_ctx *ctx = NULL; | |
2329 | ||
2330 | if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { | |
2331 | ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); | |
2332 | if (!ctx) | |
2333 | return -ENOMEM; | |
2334 | ||
2335 | if (nla[NFTA_RULE_TABLE]) { | |
2336 | ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], | |
2337 | GFP_ATOMIC); | |
2338 | if (!ctx->table) { | |
2339 | kfree(ctx); | |
2340 | return -ENOMEM; | |
2341 | } | |
2342 | } | |
2343 | if (nla[NFTA_RULE_CHAIN]) { | |
2344 | ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], | |
2345 | GFP_ATOMIC); | |
2346 | if (!ctx->chain) { | |
2347 | kfree(ctx->table); | |
2348 | kfree(ctx); | |
2349 | return -ENOMEM; | |
2350 | } | |
2351 | } | |
2352 | } | |
2353 | ||
2354 | cb->data = ctx; | |
2355 | return 0; | |
2356 | } | |
2357 | ||
6e1f760e PNA |
2358 | static int nf_tables_dump_rules_done(struct netlink_callback *cb) |
2359 | { | |
e46abbcc PS |
2360 | struct nft_rule_dump_ctx *ctx = cb->data; |
2361 | ||
2362 | if (ctx) { | |
2363 | kfree(ctx->table); | |
b7263e07 | 2364 | kfree(ctx->chain); |
e46abbcc PS |
2365 | kfree(ctx); |
2366 | } | |
6e1f760e PNA |
2367 | return 0; |
2368 | } | |
2369 | ||
d9adf22a | 2370 | /* called with rcu_read_lock held */ |
7b8002a1 PNA |
2371 | static int nf_tables_getrule(struct net *net, struct sock *nlsk, |
2372 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2373 | const struct nlattr * const nla[], |
2374 | struct netlink_ext_ack *extack) | |
96518518 PM |
2375 | { |
2376 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2377 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
2378 | const struct nft_chain *chain; |
2379 | const struct nft_rule *rule; | |
1b2470e5 | 2380 | struct nft_table *table; |
96518518 PM |
2381 | struct sk_buff *skb2; |
2382 | int family = nfmsg->nfgen_family; | |
2383 | int err; | |
2384 | ||
2385 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2386 | struct netlink_dump_control c = { | |
90fd131a | 2387 | .start= nf_tables_dump_rules_start, |
96518518 | 2388 | .dump = nf_tables_dump_rules, |
6e1f760e | 2389 | .done = nf_tables_dump_rules_done, |
d9adf22a | 2390 | .module = THIS_MODULE, |
90fd131a | 2391 | .data = (void *)nla, |
96518518 | 2392 | }; |
6e1f760e | 2393 | |
d9adf22a | 2394 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
96518518 PM |
2395 | } |
2396 | ||
cac20fcd | 2397 | table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask); |
36dd1bcc PNA |
2398 | if (IS_ERR(table)) { |
2399 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); | |
96518518 | 2400 | return PTR_ERR(table); |
36dd1bcc | 2401 | } |
96518518 | 2402 | |
f102d66b | 2403 | chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask); |
36dd1bcc PNA |
2404 | if (IS_ERR(chain)) { |
2405 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); | |
96518518 | 2406 | return PTR_ERR(chain); |
36dd1bcc | 2407 | } |
96518518 | 2408 | |
cac20fcd | 2409 | rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); |
36dd1bcc PNA |
2410 | if (IS_ERR(rule)) { |
2411 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
96518518 | 2412 | return PTR_ERR(rule); |
36dd1bcc | 2413 | } |
96518518 | 2414 | |
d9adf22a | 2415 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
96518518 PM |
2416 | if (!skb2) |
2417 | return -ENOMEM; | |
2418 | ||
84d7fce6 | 2419 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
2420 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
2421 | family, table, chain, rule); | |
2422 | if (err < 0) | |
2423 | goto err; | |
2424 | ||
2425 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2426 | ||
2427 | err: | |
2428 | kfree_skb(skb2); | |
2429 | return err; | |
2430 | } | |
2431 | ||
62472bce PM |
2432 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
2433 | struct nft_rule *rule) | |
96518518 | 2434 | { |
96518518 PM |
2435 | struct nft_expr *expr; |
2436 | ||
f102d66b | 2437 | lockdep_assert_held(&ctx->net->nft.commit_mutex); |
96518518 PM |
2438 | /* |
2439 | * Careful: some expressions might not be initialized in case this | |
2440 | * is called on error from nf_tables_newrule(). | |
2441 | */ | |
2442 | expr = nft_expr_first(rule); | |
3e38df13 | 2443 | while (expr != nft_expr_last(rule) && expr->ops) { |
62472bce | 2444 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
2445 | expr = nft_expr_next(expr); |
2446 | } | |
2447 | kfree(rule); | |
2448 | } | |
2449 | ||
bb7b40ae PNA |
2450 | static void nf_tables_rule_release(const struct nft_ctx *ctx, |
2451 | struct nft_rule *rule) | |
2452 | { | |
2453 | nft_rule_expr_deactivate(ctx, rule); | |
2454 | nf_tables_rule_destroy(ctx, rule); | |
2455 | } | |
2456 | ||
a654de8f PNA |
2457 | int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain) |
2458 | { | |
2459 | struct nft_expr *expr, *last; | |
2460 | const struct nft_data *data; | |
2461 | struct nft_rule *rule; | |
2462 | int err; | |
2463 | ||
26b2f552 TY |
2464 | if (ctx->level == NFT_JUMP_STACK_SIZE) |
2465 | return -EMLINK; | |
2466 | ||
a654de8f PNA |
2467 | list_for_each_entry(rule, &chain->rules, list) { |
2468 | if (!nft_is_active_next(ctx->net, rule)) | |
2469 | continue; | |
2470 | ||
2471 | nft_rule_for_each_expr(expr, last, rule) { | |
2472 | if (!expr->ops->validate) | |
2473 | continue; | |
2474 | ||
2475 | err = expr->ops->validate(ctx, expr, &data); | |
2476 | if (err < 0) | |
2477 | return err; | |
2478 | } | |
2479 | } | |
2480 | ||
2481 | return 0; | |
2482 | } | |
2483 | EXPORT_SYMBOL_GPL(nft_chain_validate); | |
2484 | ||
2485 | static int nft_table_validate(struct net *net, const struct nft_table *table) | |
2486 | { | |
2487 | struct nft_chain *chain; | |
2488 | struct nft_ctx ctx = { | |
2489 | .net = net, | |
2490 | .family = table->family, | |
2491 | }; | |
2492 | int err; | |
2493 | ||
2494 | list_for_each_entry(chain, &table->chains, list) { | |
2495 | if (!nft_is_base_chain(chain)) | |
2496 | continue; | |
2497 | ||
2498 | ctx.chain = chain; | |
2499 | err = nft_chain_validate(&ctx, chain); | |
2500 | if (err < 0) | |
2501 | return err; | |
2502 | } | |
2503 | ||
2504 | return 0; | |
2505 | } | |
2506 | ||
1081d11b PNA |
2507 | #define NFT_RULE_MAXEXPRS 128 |
2508 | ||
633c9a84 PNA |
2509 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
2510 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2511 | const struct nlattr * const nla[], |
2512 | struct netlink_ext_ack *extack) | |
96518518 PM |
2513 | { |
2514 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2515 | u8 genmask = nft_genmask_next(net); |
2a43ecf9 | 2516 | struct nft_expr_info *info = NULL; |
98319cb9 | 2517 | int family = nfmsg->nfgen_family; |
96518518 PM |
2518 | struct nft_table *table; |
2519 | struct nft_chain *chain; | |
2520 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 2521 | struct nft_userdata *udata; |
1081d11b | 2522 | struct nft_trans *trans = NULL; |
96518518 PM |
2523 | struct nft_expr *expr; |
2524 | struct nft_ctx ctx; | |
2525 | struct nlattr *tmp; | |
86f1ec32 | 2526 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 | 2527 | int err, rem; |
5e948466 | 2528 | u64 handle, pos_handle; |
96518518 | 2529 | |
f102d66b FW |
2530 | lockdep_assert_held(&net->nft.commit_mutex); |
2531 | ||
cac20fcd | 2532 | table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask); |
36dd1bcc PNA |
2533 | if (IS_ERR(table)) { |
2534 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); | |
96518518 | 2535 | return PTR_ERR(table); |
36dd1bcc | 2536 | } |
96518518 | 2537 | |
f102d66b | 2538 | chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask); |
36dd1bcc PNA |
2539 | if (IS_ERR(chain)) { |
2540 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); | |
96518518 | 2541 | return PTR_ERR(chain); |
36dd1bcc | 2542 | } |
96518518 PM |
2543 | |
2544 | if (nla[NFTA_RULE_HANDLE]) { | |
2545 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
cac20fcd | 2546 | rule = __nft_rule_lookup(chain, handle); |
36dd1bcc PNA |
2547 | if (IS_ERR(rule)) { |
2548 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
96518518 | 2549 | return PTR_ERR(rule); |
36dd1bcc | 2550 | } |
96518518 | 2551 | |
36dd1bcc PNA |
2552 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
2553 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
96518518 | 2554 | return -EEXIST; |
36dd1bcc | 2555 | } |
96518518 PM |
2556 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
2557 | old_rule = rule; | |
2558 | else | |
2559 | return -EOPNOTSUPP; | |
2560 | } else { | |
445509eb PNA |
2561 | if (!(nlh->nlmsg_flags & NLM_F_CREATE) || |
2562 | nlh->nlmsg_flags & NLM_F_REPLACE) | |
96518518 PM |
2563 | return -EINVAL; |
2564 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
2565 | |
2566 | if (chain->use == UINT_MAX) | |
2567 | return -EOVERFLOW; | |
96518518 PM |
2568 | } |
2569 | ||
5e948466 EL |
2570 | if (nla[NFTA_RULE_POSITION]) { |
2571 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2572 | return -EOPNOTSUPP; | |
2573 | ||
2574 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
cac20fcd | 2575 | old_rule = __nft_rule_lookup(chain, pos_handle); |
36dd1bcc PNA |
2576 | if (IS_ERR(old_rule)) { |
2577 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]); | |
5e948466 | 2578 | return PTR_ERR(old_rule); |
36dd1bcc | 2579 | } |
5e948466 EL |
2580 | } |
2581 | ||
98319cb9 | 2582 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0ca743a5 | 2583 | |
96518518 PM |
2584 | n = 0; |
2585 | size = 0; | |
2586 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2a43ecf9 FW |
2587 | info = kvmalloc_array(NFT_RULE_MAXEXPRS, |
2588 | sizeof(struct nft_expr_info), | |
2589 | GFP_KERNEL); | |
2590 | if (!info) | |
2591 | return -ENOMEM; | |
2592 | ||
96518518 PM |
2593 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { |
2594 | err = -EINVAL; | |
2595 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2596 | goto err1; | |
2597 | if (n == NFT_RULE_MAXEXPRS) | |
2598 | goto err1; | |
0ca743a5 | 2599 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2600 | if (err < 0) |
2601 | goto err1; | |
2602 | size += info[n].ops->size; | |
2603 | n++; | |
2604 | } | |
2605 | } | |
9889840f PM |
2606 | /* Check for overflow of dlen field */ |
2607 | err = -EFBIG; | |
2608 | if (size >= 1 << 12) | |
2609 | goto err1; | |
96518518 | 2610 | |
86f1ec32 | 2611 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2612 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2613 | if (ulen > 0) |
2614 | usize = sizeof(struct nft_userdata) + ulen; | |
2615 | } | |
0768b3b3 | 2616 | |
96518518 | 2617 | err = -ENOMEM; |
86f1ec32 | 2618 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2619 | if (rule == NULL) |
2620 | goto err1; | |
2621 | ||
889f7ee7 | 2622 | nft_activate_next(net, rule); |
0628b123 | 2623 | |
96518518 PM |
2624 | rule->handle = handle; |
2625 | rule->dlen = size; | |
86f1ec32 | 2626 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2627 | |
86f1ec32 PM |
2628 | if (ulen) { |
2629 | udata = nft_userdata(rule); | |
2630 | udata->len = ulen - 1; | |
2631 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2632 | } | |
96518518 | 2633 | |
96518518 PM |
2634 | expr = nft_expr_first(rule); |
2635 | for (i = 0; i < n; i++) { | |
2636 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2637 | if (err < 0) | |
2638 | goto err2; | |
a654de8f PNA |
2639 | |
2640 | if (info[i].ops->validate) | |
2641 | nft_validate_state_update(net, NFT_VALIDATE_NEED); | |
2642 | ||
ef1f7df9 | 2643 | info[i].ops = NULL; |
96518518 PM |
2644 | expr = nft_expr_next(expr); |
2645 | } | |
2646 | ||
96518518 | 2647 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
569ccae6 | 2648 | if (!nft_is_active_next(net, old_rule)) { |
0628b123 PNA |
2649 | err = -ENOENT; |
2650 | goto err2; | |
2651 | } | |
569ccae6 FW |
2652 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
2653 | old_rule); | |
2654 | if (trans == NULL) { | |
2655 | err = -ENOMEM; | |
2656 | goto err2; | |
2657 | } | |
2658 | nft_deactivate_next(net, old_rule); | |
2659 | chain->use--; | |
96518518 | 2660 | |
569ccae6 FW |
2661 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
2662 | err = -ENOMEM; | |
2663 | goto err2; | |
2664 | } | |
2665 | ||
2666 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2667 | } else { | |
2668 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { | |
2669 | err = -ENOMEM; | |
2670 | goto err2; | |
2671 | } | |
2672 | ||
2673 | if (nlh->nlmsg_flags & NLM_F_APPEND) { | |
2674 | if (old_rule) | |
2675 | list_add_rcu(&rule->list, &old_rule->list); | |
2676 | else | |
2677 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2678 | } else { | |
2679 | if (old_rule) | |
2680 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2681 | else | |
2682 | list_add_rcu(&rule->list, &chain->rules); | |
2683 | } | |
0628b123 | 2684 | } |
2a43ecf9 | 2685 | kvfree(info); |
4fefee57 | 2686 | chain->use++; |
96518518 | 2687 | |
a654de8f PNA |
2688 | if (net->nft.validate_state == NFT_VALIDATE_DO) |
2689 | return nft_table_validate(net, table); | |
2690 | ||
2691 | return 0; | |
96518518 | 2692 | err2: |
bb7b40ae | 2693 | nf_tables_rule_release(&ctx, rule); |
96518518 PM |
2694 | err1: |
2695 | for (i = 0; i < n; i++) { | |
2696 | if (info[i].ops != NULL) | |
ef1f7df9 | 2697 | module_put(info[i].ops->type->owner); |
96518518 | 2698 | } |
2a43ecf9 | 2699 | kvfree(info); |
96518518 PM |
2700 | return err; |
2701 | } | |
2702 | ||
1a94e38d PNA |
2703 | static struct nft_rule *nft_rule_lookup_byid(const struct net *net, |
2704 | const struct nlattr *nla) | |
2705 | { | |
2706 | u32 id = ntohl(nla_get_be32(nla)); | |
2707 | struct nft_trans *trans; | |
2708 | ||
2709 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
2710 | struct nft_rule *rule = nft_trans_rule(trans); | |
2711 | ||
2712 | if (trans->msg_type == NFT_MSG_NEWRULE && | |
2713 | id == nft_trans_rule_id(trans)) | |
2714 | return rule; | |
2715 | } | |
2716 | return ERR_PTR(-ENOENT); | |
2717 | } | |
2718 | ||
633c9a84 PNA |
2719 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
2720 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2721 | const struct nlattr * const nla[], |
2722 | struct netlink_ext_ack *extack) | |
96518518 PM |
2723 | { |
2724 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2725 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2726 | struct nft_table *table; |
cf9dc09d PNA |
2727 | struct nft_chain *chain = NULL; |
2728 | struct nft_rule *rule; | |
0628b123 PNA |
2729 | int family = nfmsg->nfgen_family, err = 0; |
2730 | struct nft_ctx ctx; | |
96518518 | 2731 | |
cac20fcd | 2732 | table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask); |
36dd1bcc PNA |
2733 | if (IS_ERR(table)) { |
2734 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); | |
96518518 | 2735 | return PTR_ERR(table); |
36dd1bcc | 2736 | } |
96518518 | 2737 | |
cf9dc09d | 2738 | if (nla[NFTA_RULE_CHAIN]) { |
f102d66b FW |
2739 | chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], |
2740 | genmask); | |
36dd1bcc PNA |
2741 | if (IS_ERR(chain)) { |
2742 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); | |
cf9dc09d | 2743 | return PTR_ERR(chain); |
36dd1bcc | 2744 | } |
cf9dc09d | 2745 | } |
96518518 | 2746 | |
98319cb9 | 2747 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0628b123 | 2748 | |
cf9dc09d PNA |
2749 | if (chain) { |
2750 | if (nla[NFTA_RULE_HANDLE]) { | |
cac20fcd | 2751 | rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); |
36dd1bcc PNA |
2752 | if (IS_ERR(rule)) { |
2753 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
cf9dc09d | 2754 | return PTR_ERR(rule); |
36dd1bcc | 2755 | } |
96518518 | 2756 | |
1a94e38d PNA |
2757 | err = nft_delrule(&ctx, rule); |
2758 | } else if (nla[NFTA_RULE_ID]) { | |
2759 | rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]); | |
36dd1bcc PNA |
2760 | if (IS_ERR(rule)) { |
2761 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]); | |
1a94e38d | 2762 | return PTR_ERR(rule); |
36dd1bcc | 2763 | } |
1a94e38d | 2764 | |
5e266fe7 | 2765 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2766 | } else { |
ce24b721 | 2767 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2768 | } |
2769 | } else { | |
2770 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
2771 | if (!nft_is_active_next(net, chain)) |
2772 | continue; | |
2773 | ||
cf9dc09d | 2774 | ctx.chain = chain; |
ce24b721 | 2775 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2776 | if (err < 0) |
2777 | break; | |
2778 | } | |
2779 | } | |
2780 | ||
2781 | return err; | |
2782 | } | |
2783 | ||
20a69341 PM |
2784 | /* |
2785 | * Sets | |
2786 | */ | |
2787 | ||
2b664957 | 2788 | static LIST_HEAD(nf_tables_set_types); |
20a69341 | 2789 | |
2b664957 | 2790 | int nft_register_set(struct nft_set_type *type) |
20a69341 PM |
2791 | { |
2792 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2793 | list_add_tail_rcu(&type->list, &nf_tables_set_types); |
20a69341 PM |
2794 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2795 | return 0; | |
2796 | } | |
2797 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2798 | ||
2b664957 | 2799 | void nft_unregister_set(struct nft_set_type *type) |
20a69341 PM |
2800 | { |
2801 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2802 | list_del_rcu(&type->list); |
20a69341 PM |
2803 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2804 | } | |
2805 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2806 | ||
2b664957 | 2807 | #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ |
71cc0873 PS |
2808 | NFT_SET_TIMEOUT | NFT_SET_OBJECT | \ |
2809 | NFT_SET_EVAL) | |
2b664957 | 2810 | |
71cc0873 | 2811 | static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags) |
2b664957 | 2812 | { |
71cc0873 | 2813 | return (flags & type->features) == (flags & NFT_SET_FEATURES); |
2b664957 PNA |
2814 | } |
2815 | ||
c50b960c PM |
2816 | /* |
2817 | * Select a set implementation based on the data characteristics and the | |
2818 | * given policy. The total memory use might not be known if no size is | |
2819 | * given, in that case the amount of memory per element is used. | |
2820 | */ | |
2821 | static const struct nft_set_ops * | |
2b664957 PNA |
2822 | nft_select_set_ops(const struct nft_ctx *ctx, |
2823 | const struct nlattr * const nla[], | |
c50b960c PM |
2824 | const struct nft_set_desc *desc, |
2825 | enum nft_set_policies policy) | |
20a69341 | 2826 | { |
c50b960c PM |
2827 | const struct nft_set_ops *ops, *bops; |
2828 | struct nft_set_estimate est, best; | |
2b664957 PNA |
2829 | const struct nft_set_type *type; |
2830 | u32 flags = 0; | |
20a69341 | 2831 | |
f102d66b FW |
2832 | lockdep_assert_held(&ctx->net->nft.commit_mutex); |
2833 | lockdep_nfnl_nft_mutex_not_held(); | |
20a69341 | 2834 | #ifdef CONFIG_MODULES |
2b664957 | 2835 | if (list_empty(&nf_tables_set_types)) { |
452238e8 | 2836 | nft_request_module(ctx->net, "nft-set"); |
2b664957 | 2837 | if (!list_empty(&nf_tables_set_types)) |
20a69341 PM |
2838 | return ERR_PTR(-EAGAIN); |
2839 | } | |
2840 | #endif | |
2b664957 PNA |
2841 | if (nla[NFTA_SET_FLAGS] != NULL) |
2842 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
20a69341 | 2843 | |
55af753c PNA |
2844 | bops = NULL; |
2845 | best.size = ~0; | |
2846 | best.lookup = ~0; | |
0b5a7874 | 2847 | best.space = ~0; |
c50b960c | 2848 | |
2b664957 | 2849 | list_for_each_entry(type, &nf_tables_set_types, list) { |
71cc0873 | 2850 | ops = &type->ops; |
2b664957 | 2851 | |
71cc0873 | 2852 | if (!nft_set_ops_candidate(type, flags)) |
20a69341 | 2853 | continue; |
2b664957 | 2854 | if (!ops->estimate(desc, flags, &est)) |
c50b960c PM |
2855 | continue; |
2856 | ||
2857 | switch (policy) { | |
2858 | case NFT_SET_POL_PERFORMANCE: | |
55af753c | 2859 | if (est.lookup < best.lookup) |
c50b960c | 2860 | break; |
644e334e PNA |
2861 | if (est.lookup == best.lookup && |
2862 | est.space < best.space) | |
2863 | break; | |
c50b960c PM |
2864 | continue; |
2865 | case NFT_SET_POL_MEMORY: | |
0b5a7874 PNA |
2866 | if (!desc->size) { |
2867 | if (est.space < best.space) | |
2868 | break; | |
2869 | if (est.space == best.space && | |
2870 | est.lookup < best.lookup) | |
2871 | break; | |
4f2921ca | 2872 | } else if (est.size < best.size || !bops) { |
c50b960c | 2873 | break; |
0b5a7874 | 2874 | } |
c50b960c PM |
2875 | continue; |
2876 | default: | |
2877 | break; | |
2878 | } | |
2879 | ||
2b664957 | 2880 | if (!try_module_get(type->owner)) |
20a69341 | 2881 | continue; |
c50b960c | 2882 | if (bops != NULL) |
71cc0873 | 2883 | module_put(to_set_type(bops)->owner); |
c50b960c PM |
2884 | |
2885 | bops = ops; | |
2886 | best = est; | |
20a69341 PM |
2887 | } |
2888 | ||
c50b960c PM |
2889 | if (bops != NULL) |
2890 | return bops; | |
2891 | ||
20a69341 PM |
2892 | return ERR_PTR(-EOPNOTSUPP); |
2893 | } | |
2894 | ||
2895 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
b2fbd044 LZ |
2896 | [NFTA_SET_TABLE] = { .type = NLA_STRING, |
2897 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
a9bdd836 | 2898 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
cb39ad8b | 2899 | .len = NFT_SET_MAXNAMELEN - 1 }, |
20a69341 PM |
2900 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2901 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2902 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2903 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2904 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2905 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2906 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2907 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2908 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2909 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
e6d8ecac CFG |
2910 | [NFTA_SET_USERDATA] = { .type = NLA_BINARY, |
2911 | .len = NFT_USERDATA_MAXLEN }, | |
8aeff920 | 2912 | [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, |
3ecbfd65 | 2913 | [NFTA_SET_HANDLE] = { .type = NLA_U64 }, |
c50b960c PM |
2914 | }; |
2915 | ||
2916 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2917 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2918 | }; |
2919 | ||
633c9a84 | 2920 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
2921 | const struct sk_buff *skb, |
2922 | const struct nlmsghdr *nlh, | |
f2a6d766 | 2923 | const struct nlattr * const nla[], |
36dd1bcc | 2924 | struct netlink_ext_ack *extack, |
f2a6d766 | 2925 | u8 genmask) |
20a69341 PM |
2926 | { |
2927 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
98319cb9 | 2928 | int family = nfmsg->nfgen_family; |
7c95f6d8 | 2929 | struct nft_table *table = NULL; |
20a69341 | 2930 | |
20a69341 | 2931 | if (nla[NFTA_SET_TABLE] != NULL) { |
cac20fcd PNA |
2932 | table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, |
2933 | genmask); | |
36dd1bcc PNA |
2934 | if (IS_ERR(table)) { |
2935 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); | |
20a69341 | 2936 | return PTR_ERR(table); |
36dd1bcc | 2937 | } |
20a69341 PM |
2938 | } |
2939 | ||
98319cb9 | 2940 | nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 PM |
2941 | return 0; |
2942 | } | |
2943 | ||
cac20fcd PNA |
2944 | static struct nft_set *nft_set_lookup(const struct nft_table *table, |
2945 | const struct nlattr *nla, u8 genmask) | |
20a69341 PM |
2946 | { |
2947 | struct nft_set *set; | |
2948 | ||
2949 | if (nla == NULL) | |
2950 | return ERR_PTR(-EINVAL); | |
2951 | ||
d9adf22a | 2952 | list_for_each_entry_rcu(set, &table->sets, list) { |
37a9cc52 PNA |
2953 | if (!nla_strcmp(nla, set->name) && |
2954 | nft_active_genmask(set, genmask)) | |
20a69341 PM |
2955 | return set; |
2956 | } | |
2957 | return ERR_PTR(-ENOENT); | |
2958 | } | |
2959 | ||
cac20fcd PNA |
2960 | static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table, |
2961 | const struct nlattr *nla, | |
2962 | u8 genmask) | |
3ecbfd65 HS |
2963 | { |
2964 | struct nft_set *set; | |
2965 | ||
3ecbfd65 HS |
2966 | list_for_each_entry(set, &table->sets, list) { |
2967 | if (be64_to_cpu(nla_get_be64(nla)) == set->handle && | |
2968 | nft_active_genmask(set, genmask)) | |
2969 | return set; | |
2970 | } | |
2971 | return ERR_PTR(-ENOENT); | |
2972 | } | |
2973 | ||
cac20fcd PNA |
2974 | static struct nft_set *nft_set_lookup_byid(const struct net *net, |
2975 | const struct nlattr *nla, u8 genmask) | |
958bee14 PNA |
2976 | { |
2977 | struct nft_trans *trans; | |
2978 | u32 id = ntohl(nla_get_be32(nla)); | |
2979 | ||
2980 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
9c7f96fd AK |
2981 | if (trans->msg_type == NFT_MSG_NEWSET) { |
2982 | struct nft_set *set = nft_trans_set(trans); | |
37a9cc52 | 2983 | |
9c7f96fd AK |
2984 | if (id == nft_trans_set_id(trans) && |
2985 | nft_active_genmask(set, genmask)) | |
2986 | return set; | |
2987 | } | |
958bee14 PNA |
2988 | } |
2989 | return ERR_PTR(-ENOENT); | |
2990 | } | |
c7a72e3f | 2991 | |
10659cba PNA |
2992 | struct nft_set *nft_set_lookup_global(const struct net *net, |
2993 | const struct nft_table *table, | |
2994 | const struct nlattr *nla_set_name, | |
2995 | const struct nlattr *nla_set_id, | |
2996 | u8 genmask) | |
c7a72e3f PNA |
2997 | { |
2998 | struct nft_set *set; | |
2999 | ||
cac20fcd | 3000 | set = nft_set_lookup(table, nla_set_name, genmask); |
c7a72e3f PNA |
3001 | if (IS_ERR(set)) { |
3002 | if (!nla_set_id) | |
3003 | return set; | |
3004 | ||
cac20fcd | 3005 | set = nft_set_lookup_byid(net, nla_set_id, genmask); |
c7a72e3f PNA |
3006 | } |
3007 | return set; | |
3008 | } | |
10659cba | 3009 | EXPORT_SYMBOL_GPL(nft_set_lookup_global); |
958bee14 | 3010 | |
20a69341 PM |
3011 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
3012 | const char *name) | |
3013 | { | |
3014 | const struct nft_set *i; | |
3015 | const char *p; | |
3016 | unsigned long *inuse; | |
60eb1894 | 3017 | unsigned int n = 0, min = 0; |
20a69341 | 3018 | |
38745490 | 3019 | p = strchr(name, '%'); |
20a69341 PM |
3020 | if (p != NULL) { |
3021 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
3022 | return -EINVAL; | |
3023 | ||
3024 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
3025 | if (inuse == NULL) | |
3026 | return -ENOMEM; | |
60eb1894 | 3027 | cont: |
20a69341 | 3028 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
3029 | int tmp; |
3030 | ||
37a9cc52 PNA |
3031 | if (!nft_is_active_next(ctx->net, set)) |
3032 | continue; | |
14662917 | 3033 | if (!sscanf(i->name, name, &tmp)) |
20a69341 | 3034 | continue; |
60eb1894 | 3035 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 3036 | continue; |
14662917 | 3037 | |
60eb1894 | 3038 | set_bit(tmp - min, inuse); |
20a69341 PM |
3039 | } |
3040 | ||
53b70287 | 3041 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
3042 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
3043 | min += BITS_PER_BYTE * PAGE_SIZE; | |
3044 | memset(inuse, 0, PAGE_SIZE); | |
3045 | goto cont; | |
3046 | } | |
20a69341 PM |
3047 | free_page((unsigned long)inuse); |
3048 | } | |
3049 | ||
38745490 PS |
3050 | set->name = kasprintf(GFP_KERNEL, name, min + n); |
3051 | if (!set->name) | |
3052 | return -ENOMEM; | |
3053 | ||
20a69341 | 3054 | list_for_each_entry(i, &ctx->table->sets, list) { |
37a9cc52 PNA |
3055 | if (!nft_is_active_next(ctx->net, i)) |
3056 | continue; | |
e63aaaa6 AY |
3057 | if (!strcmp(set->name, i->name)) { |
3058 | kfree(set->name); | |
20a69341 | 3059 | return -ENFILE; |
e63aaaa6 | 3060 | } |
20a69341 PM |
3061 | } |
3062 | return 0; | |
3063 | } | |
3064 | ||
8e1102d5 FW |
3065 | static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result) |
3066 | { | |
3067 | u64 ms = be64_to_cpu(nla_get_be64(nla)); | |
3068 | u64 max = (u64)(~((u64)0)); | |
3069 | ||
3070 | max = div_u64(max, NSEC_PER_MSEC); | |
3071 | if (ms >= max) | |
3072 | return -ERANGE; | |
3073 | ||
3074 | ms *= NSEC_PER_MSEC; | |
3075 | *result = nsecs_to_jiffies64(ms); | |
3076 | return 0; | |
3077 | } | |
3078 | ||
d6501de8 | 3079 | static __be64 nf_jiffies64_to_msecs(u64 input) |
8e1102d5 FW |
3080 | { |
3081 | u64 ms = jiffies64_to_nsecs(input); | |
3082 | ||
3083 | return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC)); | |
3084 | } | |
3085 | ||
20a69341 PM |
3086 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, |
3087 | const struct nft_set *set, u16 event, u16 flags) | |
3088 | { | |
3089 | struct nfgenmsg *nfmsg; | |
3090 | struct nlmsghdr *nlh; | |
c50b960c | 3091 | struct nlattr *desc; |
128ad332 PNA |
3092 | u32 portid = ctx->portid; |
3093 | u32 seq = ctx->seq; | |
20a69341 | 3094 | |
dedb67c4 | 3095 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
20a69341 PM |
3096 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
3097 | flags); | |
3098 | if (nlh == NULL) | |
3099 | goto nla_put_failure; | |
3100 | ||
3101 | nfmsg = nlmsg_data(nlh); | |
36596dad | 3102 | nfmsg->nfgen_family = ctx->family; |
20a69341 | 3103 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 3104 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
3105 | |
3106 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3107 | goto nla_put_failure; | |
3108 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3109 | goto nla_put_failure; | |
3ecbfd65 HS |
3110 | if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle), |
3111 | NFTA_SET_PAD)) | |
3112 | goto nla_put_failure; | |
20a69341 PM |
3113 | if (set->flags != 0) |
3114 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
3115 | goto nla_put_failure; | |
3116 | ||
3117 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
3118 | goto nla_put_failure; | |
3119 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
3120 | goto nla_put_failure; | |
3121 | if (set->flags & NFT_SET_MAP) { | |
3122 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
3123 | goto nla_put_failure; | |
3124 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
3125 | goto nla_put_failure; | |
3126 | } | |
8aeff920 PNA |
3127 | if (set->flags & NFT_SET_OBJECT && |
3128 | nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) | |
3129 | goto nla_put_failure; | |
20a69341 | 3130 | |
761da293 | 3131 | if (set->timeout && |
d3e2a111 | 3132 | nla_put_be64(skb, NFTA_SET_TIMEOUT, |
8e1102d5 | 3133 | nf_jiffies64_to_msecs(set->timeout), |
b46f6ded | 3134 | NFTA_SET_PAD)) |
761da293 PM |
3135 | goto nla_put_failure; |
3136 | if (set->gc_int && | |
3137 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
3138 | goto nla_put_failure; | |
3139 | ||
9363dc4b AB |
3140 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
3141 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
3142 | goto nla_put_failure; | |
3143 | } | |
3144 | ||
e6d8ecac CFG |
3145 | if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) |
3146 | goto nla_put_failure; | |
3147 | ||
c50b960c PM |
3148 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
3149 | if (desc == NULL) | |
3150 | goto nla_put_failure; | |
3151 | if (set->size && | |
3152 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
3153 | goto nla_put_failure; | |
3154 | nla_nest_end(skb, desc); | |
3155 | ||
053c095a JB |
3156 | nlmsg_end(skb, nlh); |
3157 | return 0; | |
20a69341 PM |
3158 | |
3159 | nla_put_failure: | |
3160 | nlmsg_trim(skb, nlh); | |
3161 | return -1; | |
3162 | } | |
3163 | ||
25e94a99 PNA |
3164 | static void nf_tables_set_notify(const struct nft_ctx *ctx, |
3165 | const struct nft_set *set, int event, | |
3166 | gfp_t gfp_flags) | |
20a69341 PM |
3167 | { |
3168 | struct sk_buff *skb; | |
128ad332 | 3169 | u32 portid = ctx->portid; |
20a69341 PM |
3170 | int err; |
3171 | ||
128ad332 PNA |
3172 | if (!ctx->report && |
3173 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 3174 | return; |
20a69341 | 3175 | |
31f8441c | 3176 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
3177 | if (skb == NULL) |
3178 | goto err; | |
3179 | ||
3180 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
3181 | if (err < 0) { | |
3182 | kfree_skb(skb); | |
3183 | goto err; | |
3184 | } | |
3185 | ||
25e94a99 PNA |
3186 | nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report, |
3187 | gfp_flags); | |
3188 | return; | |
20a69341 | 3189 | err: |
25e94a99 | 3190 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
20a69341 PM |
3191 | } |
3192 | ||
5b96af77 | 3193 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
3194 | { |
3195 | const struct nft_set *set; | |
3196 | unsigned int idx, s_idx = cb->args[0]; | |
c9c8e485 PNA |
3197 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
3198 | struct net *net = sock_net(skb->sk); | |
5b96af77 | 3199 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
3200 | |
3201 | if (cb->args[1]) | |
3202 | return skb->len; | |
3203 | ||
e688a7f8 | 3204 | rcu_read_lock(); |
38e029f1 PNA |
3205 | cb->seq = net->nft.base_seq; |
3206 | ||
36596dad PNA |
3207 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
3208 | if (ctx->family != NFPROTO_UNSPEC && | |
98319cb9 | 3209 | ctx->family != table->family) |
36596dad PNA |
3210 | continue; |
3211 | ||
3212 | if (ctx->table && ctx->table != table) | |
5b96af77 PNA |
3213 | continue; |
3214 | ||
36596dad PNA |
3215 | if (cur_table) { |
3216 | if (cur_table != table) | |
c9c8e485 PNA |
3217 | continue; |
3218 | ||
36596dad | 3219 | cur_table = NULL; |
c9c8e485 | 3220 | } |
36596dad PNA |
3221 | idx = 0; |
3222 | list_for_each_entry_rcu(set, &table->sets, list) { | |
3223 | if (idx < s_idx) | |
3224 | goto cont; | |
3225 | if (!nft_is_active(net, set)) | |
3226 | goto cont; | |
5b96af77 | 3227 | |
36596dad PNA |
3228 | ctx_set = *ctx; |
3229 | ctx_set.table = table; | |
98319cb9 | 3230 | ctx_set.family = table->family; |
c9c8e485 | 3231 | |
36596dad PNA |
3232 | if (nf_tables_fill_set(skb, &ctx_set, set, |
3233 | NFT_MSG_NEWSET, | |
3234 | NLM_F_MULTI) < 0) { | |
3235 | cb->args[0] = idx; | |
3236 | cb->args[2] = (unsigned long) table; | |
3237 | goto done; | |
c9c8e485 | 3238 | } |
36596dad | 3239 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 | 3240 | cont: |
36596dad | 3241 | idx++; |
c9c8e485 | 3242 | } |
36596dad PNA |
3243 | if (s_idx) |
3244 | s_idx = 0; | |
c9c8e485 PNA |
3245 | } |
3246 | cb->args[1] = 1; | |
3247 | done: | |
e688a7f8 | 3248 | rcu_read_unlock(); |
c9c8e485 PNA |
3249 | return skb->len; |
3250 | } | |
3251 | ||
90fd131a FW |
3252 | static int nf_tables_dump_sets_start(struct netlink_callback *cb) |
3253 | { | |
3254 | struct nft_ctx *ctx_dump = NULL; | |
3255 | ||
3256 | ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC); | |
3257 | if (ctx_dump == NULL) | |
3258 | return -ENOMEM; | |
3259 | ||
3260 | cb->data = ctx_dump; | |
3261 | return 0; | |
3262 | } | |
3263 | ||
5b96af77 | 3264 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 3265 | { |
5b96af77 PNA |
3266 | kfree(cb->data); |
3267 | return 0; | |
20a69341 PM |
3268 | } |
3269 | ||
d9adf22a | 3270 | /* called with rcu_read_lock held */ |
7b8002a1 PNA |
3271 | static int nf_tables_getset(struct net *net, struct sock *nlsk, |
3272 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3273 | const struct nlattr * const nla[], |
3274 | struct netlink_ext_ack *extack) | |
20a69341 | 3275 | { |
f2a6d766 | 3276 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
3277 | const struct nft_set *set; |
3278 | struct nft_ctx ctx; | |
3279 | struct sk_buff *skb2; | |
c9c8e485 | 3280 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
3281 | int err; |
3282 | ||
01cfa0a4 | 3283 | /* Verify existence before starting dump */ |
36dd1bcc PNA |
3284 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack, |
3285 | genmask); | |
20a69341 PM |
3286 | if (err < 0) |
3287 | return err; | |
3288 | ||
3289 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3290 | struct netlink_dump_control c = { | |
90fd131a | 3291 | .start = nf_tables_dump_sets_start, |
20a69341 | 3292 | .dump = nf_tables_dump_sets, |
5b96af77 | 3293 | .done = nf_tables_dump_sets_done, |
90fd131a | 3294 | .data = &ctx, |
d9adf22a | 3295 | .module = THIS_MODULE, |
20a69341 | 3296 | }; |
5b96af77 | 3297 | |
d9adf22a | 3298 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
20a69341 PM |
3299 | } |
3300 | ||
c9c8e485 PNA |
3301 | /* Only accept unspec with dump */ |
3302 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
3303 | return -EAFNOSUPPORT; | |
eaa2bcd6 PT |
3304 | if (!nla[NFTA_SET_TABLE]) |
3305 | return -EINVAL; | |
c9c8e485 | 3306 | |
cac20fcd | 3307 | set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3308 | if (IS_ERR(set)) |
3309 | return PTR_ERR(set); | |
3310 | ||
d9adf22a | 3311 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
20a69341 PM |
3312 | if (skb2 == NULL) |
3313 | return -ENOMEM; | |
3314 | ||
3315 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
3316 | if (err < 0) | |
3317 | goto err; | |
3318 | ||
3319 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
3320 | ||
3321 | err: | |
3322 | kfree_skb(skb2); | |
3323 | return err; | |
3324 | } | |
3325 | ||
c50b960c PM |
3326 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
3327 | struct nft_set_desc *desc, | |
3328 | const struct nlattr *nla) | |
3329 | { | |
3330 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
3331 | int err; | |
3332 | ||
fceb6435 JB |
3333 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, |
3334 | nft_set_desc_policy, NULL); | |
c50b960c PM |
3335 | if (err < 0) |
3336 | return err; | |
3337 | ||
3338 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
3339 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
3340 | ||
3341 | return 0; | |
3342 | } | |
3343 | ||
633c9a84 PNA |
3344 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
3345 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3346 | const struct nlattr * const nla[], |
3347 | struct netlink_ext_ack *extack) | |
20a69341 PM |
3348 | { |
3349 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 3350 | u8 genmask = nft_genmask_next(net); |
98319cb9 | 3351 | int family = nfmsg->nfgen_family; |
20a69341 | 3352 | const struct nft_set_ops *ops; |
20a69341 PM |
3353 | struct nft_table *table; |
3354 | struct nft_set *set; | |
3355 | struct nft_ctx ctx; | |
38745490 | 3356 | char *name; |
4ef360dd | 3357 | u64 size; |
761da293 | 3358 | u64 timeout; |
8aeff920 | 3359 | u32 ktype, dtype, flags, policy, gc_int, objtype; |
c50b960c | 3360 | struct nft_set_desc desc; |
e6d8ecac CFG |
3361 | unsigned char *udata; |
3362 | u16 udlen; | |
20a69341 PM |
3363 | int err; |
3364 | ||
3365 | if (nla[NFTA_SET_TABLE] == NULL || | |
3366 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
3367 | nla[NFTA_SET_KEY_LEN] == NULL || |
3368 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
3369 | return -EINVAL; |
3370 | ||
c50b960c PM |
3371 | memset(&desc, 0, sizeof(desc)); |
3372 | ||
20a69341 PM |
3373 | ktype = NFT_DATA_VALUE; |
3374 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
3375 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
3376 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
3377 | return -EINVAL; | |
3378 | } | |
3379 | ||
c50b960c | 3380 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 3381 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3382 | return -EINVAL; |
3383 | ||
3384 | flags = 0; | |
3385 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
3386 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
3387 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 | 3388 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
8aeff920 PNA |
3389 | NFT_SET_MAP | NFT_SET_EVAL | |
3390 | NFT_SET_OBJECT)) | |
20a69341 | 3391 | return -EINVAL; |
8aeff920 PNA |
3392 | /* Only one of these operations is supported */ |
3393 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) == | |
3394 | (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) | |
7c6c6e95 | 3395 | return -EOPNOTSUPP; |
20a69341 PM |
3396 | } |
3397 | ||
3398 | dtype = 0; | |
20a69341 PM |
3399 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
3400 | if (!(flags & NFT_SET_MAP)) | |
3401 | return -EINVAL; | |
3402 | ||
3403 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
3404 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
3405 | dtype != NFT_DATA_VERDICT) | |
3406 | return -EINVAL; | |
3407 | ||
3408 | if (dtype != NFT_DATA_VERDICT) { | |
3409 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
3410 | return -EINVAL; | |
c50b960c | 3411 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 3412 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3413 | return -EINVAL; |
3414 | } else | |
7d740264 | 3415 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
3416 | } else if (flags & NFT_SET_MAP) |
3417 | return -EINVAL; | |
3418 | ||
8aeff920 PNA |
3419 | if (nla[NFTA_SET_OBJ_TYPE] != NULL) { |
3420 | if (!(flags & NFT_SET_OBJECT)) | |
3421 | return -EINVAL; | |
3422 | ||
3423 | objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); | |
3424 | if (objtype == NFT_OBJECT_UNSPEC || | |
3425 | objtype > NFT_OBJECT_MAX) | |
3426 | return -EINVAL; | |
3427 | } else if (flags & NFT_SET_OBJECT) | |
3428 | return -EINVAL; | |
3429 | else | |
3430 | objtype = NFT_OBJECT_UNSPEC; | |
3431 | ||
761da293 PM |
3432 | timeout = 0; |
3433 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
3434 | if (!(flags & NFT_SET_TIMEOUT)) | |
3435 | return -EINVAL; | |
8e1102d5 FW |
3436 | |
3437 | err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout); | |
3438 | if (err) | |
3439 | return err; | |
761da293 PM |
3440 | } |
3441 | gc_int = 0; | |
3442 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
3443 | if (!(flags & NFT_SET_TIMEOUT)) | |
3444 | return -EINVAL; | |
3445 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
3446 | } | |
3447 | ||
c50b960c PM |
3448 | policy = NFT_SET_POL_PERFORMANCE; |
3449 | if (nla[NFTA_SET_POLICY] != NULL) | |
3450 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
3451 | ||
3452 | if (nla[NFTA_SET_DESC] != NULL) { | |
3453 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
3454 | if (err < 0) | |
3455 | return err; | |
3456 | } | |
3457 | ||
cac20fcd | 3458 | table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask); |
36dd1bcc PNA |
3459 | if (IS_ERR(table)) { |
3460 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); | |
20a69341 | 3461 | return PTR_ERR(table); |
36dd1bcc | 3462 | } |
20a69341 | 3463 | |
98319cb9 | 3464 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 | 3465 | |
cac20fcd | 3466 | set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask); |
20a69341 | 3467 | if (IS_ERR(set)) { |
36dd1bcc PNA |
3468 | if (PTR_ERR(set) != -ENOENT) { |
3469 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); | |
20a69341 | 3470 | return PTR_ERR(set); |
36dd1bcc | 3471 | } |
1a28ad74 | 3472 | } else { |
36dd1bcc PNA |
3473 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
3474 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); | |
20a69341 | 3475 | return -EEXIST; |
36dd1bcc | 3476 | } |
20a69341 PM |
3477 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
3478 | return -EOPNOTSUPP; | |
36dd1bcc | 3479 | |
20a69341 PM |
3480 | return 0; |
3481 | } | |
3482 | ||
3483 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
3484 | return -ENOENT; | |
3485 | ||
2b664957 | 3486 | ops = nft_select_set_ops(&ctx, nla, &desc, policy); |
20a69341 PM |
3487 | if (IS_ERR(ops)) |
3488 | return PTR_ERR(ops); | |
3489 | ||
e6d8ecac CFG |
3490 | udlen = 0; |
3491 | if (nla[NFTA_SET_USERDATA]) | |
3492 | udlen = nla_len(nla[NFTA_SET_USERDATA]); | |
3493 | ||
20a69341 PM |
3494 | size = 0; |
3495 | if (ops->privsize != NULL) | |
347b408d | 3496 | size = ops->privsize(nla, &desc); |
20a69341 | 3497 | |
1ff75a3e PNA |
3498 | set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); |
3499 | if (!set) { | |
3500 | err = -ENOMEM; | |
20a69341 | 3501 | goto err1; |
1ff75a3e | 3502 | } |
20a69341 | 3503 | |
38745490 PS |
3504 | name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL); |
3505 | if (!name) { | |
3506 | err = -ENOMEM; | |
3507 | goto err2; | |
3508 | } | |
3509 | ||
20a69341 | 3510 | err = nf_tables_set_alloc_name(&ctx, set, name); |
38745490 | 3511 | kfree(name); |
20a69341 PM |
3512 | if (err < 0) |
3513 | goto err2; | |
3514 | ||
e6d8ecac CFG |
3515 | udata = NULL; |
3516 | if (udlen) { | |
3517 | udata = set->data + size; | |
3518 | nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); | |
3519 | } | |
3520 | ||
20a69341 | 3521 | INIT_LIST_HEAD(&set->bindings); |
3453c927 PNA |
3522 | set->table = table; |
3523 | write_pnet(&set->net, net); | |
20a69341 PM |
3524 | set->ops = ops; |
3525 | set->ktype = ktype; | |
c50b960c | 3526 | set->klen = desc.klen; |
20a69341 | 3527 | set->dtype = dtype; |
8aeff920 | 3528 | set->objtype = objtype; |
c50b960c | 3529 | set->dlen = desc.dlen; |
20a69341 | 3530 | set->flags = flags; |
c50b960c | 3531 | set->size = desc.size; |
9363dc4b | 3532 | set->policy = policy; |
e6d8ecac CFG |
3533 | set->udlen = udlen; |
3534 | set->udata = udata; | |
761da293 PM |
3535 | set->timeout = timeout; |
3536 | set->gc_int = gc_int; | |
3ecbfd65 | 3537 | set->handle = nf_tables_alloc_handle(table); |
20a69341 | 3538 | |
c50b960c | 3539 | err = ops->init(set, &desc, nla); |
20a69341 | 3540 | if (err < 0) |
2f6adf48 | 3541 | goto err3; |
20a69341 | 3542 | |
958bee14 | 3543 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 | 3544 | if (err < 0) |
2f6adf48 | 3545 | goto err4; |
20a69341 | 3546 | |
e688a7f8 | 3547 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 3548 | table->use++; |
20a69341 PM |
3549 | return 0; |
3550 | ||
2f6adf48 | 3551 | err4: |
c17c3cdf | 3552 | ops->destroy(set); |
2f6adf48 FW |
3553 | err3: |
3554 | kfree(set->name); | |
20a69341 | 3555 | err2: |
1ff75a3e | 3556 | kvfree(set); |
20a69341 | 3557 | err1: |
71cc0873 | 3558 | module_put(to_set_type(ops)->owner); |
20a69341 PM |
3559 | return err; |
3560 | } | |
3561 | ||
958bee14 | 3562 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 3563 | { |
20a69341 | 3564 | set->ops->destroy(set); |
71cc0873 | 3565 | module_put(to_set_type(set->ops)->owner); |
38745490 | 3566 | kfree(set->name); |
1ff75a3e | 3567 | kvfree(set); |
20a69341 PM |
3568 | } |
3569 | ||
958bee14 PNA |
3570 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
3571 | { | |
e688a7f8 | 3572 | list_del_rcu(&set->list); |
31f8441c | 3573 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
3574 | nft_set_destroy(set); |
3575 | } | |
3576 | ||
633c9a84 PNA |
3577 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
3578 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3579 | const struct nlattr * const nla[], |
3580 | struct netlink_ext_ack *extack) | |
20a69341 | 3581 | { |
c9c8e485 | 3582 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
f2a6d766 | 3583 | u8 genmask = nft_genmask_next(net); |
36dd1bcc | 3584 | const struct nlattr *attr; |
20a69341 PM |
3585 | struct nft_set *set; |
3586 | struct nft_ctx ctx; | |
3587 | int err; | |
3588 | ||
ec2c9935 PM |
3589 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
3590 | return -EAFNOSUPPORT; | |
20a69341 PM |
3591 | if (nla[NFTA_SET_TABLE] == NULL) |
3592 | return -EINVAL; | |
3593 | ||
36dd1bcc PNA |
3594 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack, |
3595 | genmask); | |
20a69341 PM |
3596 | if (err < 0) |
3597 | return err; | |
3598 | ||
36dd1bcc PNA |
3599 | if (nla[NFTA_SET_HANDLE]) { |
3600 | attr = nla[NFTA_SET_HANDLE]; | |
3601 | set = nft_set_lookup_byhandle(ctx.table, attr, genmask); | |
3602 | } else { | |
3603 | attr = nla[NFTA_SET_NAME]; | |
3604 | set = nft_set_lookup(ctx.table, attr, genmask); | |
3605 | } | |
a8278400 | 3606 | |
36dd1bcc PNA |
3607 | if (IS_ERR(set)) { |
3608 | NL_SET_BAD_ATTR(extack, attr); | |
3609 | return PTR_ERR(set); | |
3610 | } | |
a8278400 | 3611 | if (!list_empty(&set->bindings) || |
36dd1bcc PNA |
3612 | (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) { |
3613 | NL_SET_BAD_ATTR(extack, attr); | |
20a69341 | 3614 | return -EBUSY; |
36dd1bcc | 3615 | } |
20a69341 | 3616 | |
ee01d542 | 3617 | return nft_delset(&ctx, set); |
20a69341 PM |
3618 | } |
3619 | ||
3620 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 3621 | struct nft_set *set, |
20a69341 | 3622 | const struct nft_set_iter *iter, |
de70185d | 3623 | struct nft_set_elem *elem) |
20a69341 | 3624 | { |
fe2811eb | 3625 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3626 | enum nft_registers dreg; |
3627 | ||
3628 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
3629 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
3630 | set->dtype == NFT_DATA_VERDICT ? | |
3631 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
3632 | set->dlen); | |
20a69341 PM |
3633 | } |
3634 | ||
3635 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3636 | struct nft_set_binding *binding) | |
3637 | { | |
3638 | struct nft_set_binding *i; | |
3639 | struct nft_set_iter iter; | |
3640 | ||
408070d6 | 3641 | if (!list_empty(&set->bindings) && nft_set_is_anonymous(set)) |
20a69341 PM |
3642 | return -EBUSY; |
3643 | ||
11113e19 | 3644 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
3645 | /* If the set is already bound to the same chain all |
3646 | * jumps are already validated for that chain. | |
3647 | */ | |
3648 | list_for_each_entry(i, &set->bindings, list) { | |
a4684402 | 3649 | if (i->flags & NFT_SET_MAP && |
11113e19 | 3650 | i->chain == binding->chain) |
20a69341 PM |
3651 | goto bind; |
3652 | } | |
3653 | ||
8588ac09 | 3654 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
3655 | iter.skip = 0; |
3656 | iter.count = 0; | |
3657 | iter.err = 0; | |
3658 | iter.fn = nf_tables_bind_check_setelem; | |
3659 | ||
3660 | set->ops->walk(ctx, set, &iter); | |
a02f4248 | 3661 | if (iter.err < 0) |
20a69341 | 3662 | return iter.err; |
20a69341 PM |
3663 | } |
3664 | bind: | |
3665 | binding->chain = ctx->chain; | |
e688a7f8 | 3666 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
3667 | return 0; |
3668 | } | |
63aea290 | 3669 | EXPORT_SYMBOL_GPL(nf_tables_bind_set); |
20a69341 PM |
3670 | |
3671 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3672 | struct nft_set_binding *binding) | |
3673 | { | |
e688a7f8 | 3674 | list_del_rcu(&binding->list); |
20a69341 | 3675 | |
408070d6 | 3676 | if (list_empty(&set->bindings) && nft_set_is_anonymous(set) && |
37a9cc52 | 3677 | nft_is_active(ctx->net, set)) |
20a69341 PM |
3678 | nf_tables_set_destroy(ctx, set); |
3679 | } | |
63aea290 | 3680 | EXPORT_SYMBOL_GPL(nf_tables_unbind_set); |
20a69341 | 3681 | |
3ac4c07a PM |
3682 | const struct nft_set_ext_type nft_set_ext_types[] = { |
3683 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 3684 | .align = __alignof__(u32), |
3ac4c07a PM |
3685 | }, |
3686 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 3687 | .align = __alignof__(u32), |
3ac4c07a | 3688 | }, |
f25ad2e9 PM |
3689 | [NFT_SET_EXT_EXPR] = { |
3690 | .align = __alignof__(struct nft_expr), | |
3691 | }, | |
8aeff920 PNA |
3692 | [NFT_SET_EXT_OBJREF] = { |
3693 | .len = sizeof(struct nft_object *), | |
3694 | .align = __alignof__(struct nft_object *), | |
3695 | }, | |
3ac4c07a PM |
3696 | [NFT_SET_EXT_FLAGS] = { |
3697 | .len = sizeof(u8), | |
3698 | .align = __alignof__(u8), | |
3699 | }, | |
c3e1b005 PM |
3700 | [NFT_SET_EXT_TIMEOUT] = { |
3701 | .len = sizeof(u64), | |
3702 | .align = __alignof__(u64), | |
3703 | }, | |
3704 | [NFT_SET_EXT_EXPIRATION] = { | |
8e1102d5 FW |
3705 | .len = sizeof(u64), |
3706 | .align = __alignof__(u64), | |
c3e1b005 | 3707 | }, |
68e942e8 PM |
3708 | [NFT_SET_EXT_USERDATA] = { |
3709 | .len = sizeof(struct nft_userdata), | |
3710 | .align = __alignof__(struct nft_userdata), | |
3711 | }, | |
3ac4c07a PM |
3712 | }; |
3713 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
3714 | ||
20a69341 PM |
3715 | /* |
3716 | * Set elements | |
3717 | */ | |
3718 | ||
3719 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
3720 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
3721 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
3722 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 3723 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
3724 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
3725 | .len = NFT_USERDATA_MAXLEN }, | |
467697d2 FW |
3726 | [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED }, |
3727 | [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING }, | |
20a69341 PM |
3728 | }; |
3729 | ||
3730 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
b2fbd044 LZ |
3731 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, |
3732 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
3733 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, | |
3734 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
20a69341 | 3735 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
958bee14 | 3736 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
3737 | }; |
3738 | ||
633c9a84 | 3739 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
3740 | const struct sk_buff *skb, |
3741 | const struct nlmsghdr *nlh, | |
f2a6d766 | 3742 | const struct nlattr * const nla[], |
36dd1bcc | 3743 | struct netlink_ext_ack *extack, |
f2a6d766 | 3744 | u8 genmask) |
20a69341 PM |
3745 | { |
3746 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
98319cb9 | 3747 | int family = nfmsg->nfgen_family; |
7c95f6d8 | 3748 | struct nft_table *table; |
20a69341 | 3749 | |
cac20fcd PNA |
3750 | table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, |
3751 | genmask); | |
36dd1bcc PNA |
3752 | if (IS_ERR(table)) { |
3753 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); | |
20a69341 | 3754 | return PTR_ERR(table); |
36dd1bcc | 3755 | } |
20a69341 | 3756 | |
98319cb9 | 3757 | nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 PM |
3758 | return 0; |
3759 | } | |
3760 | ||
3761 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
3762 | const struct nft_set *set, | |
3763 | const struct nft_set_elem *elem) | |
3764 | { | |
fe2811eb | 3765 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3766 | unsigned char *b = skb_tail_pointer(skb); |
3767 | struct nlattr *nest; | |
3768 | ||
3769 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
3770 | if (nest == NULL) | |
3771 | goto nla_put_failure; | |
3772 | ||
fe2811eb PM |
3773 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
3774 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
3775 | goto nla_put_failure; |
3776 | ||
fe2811eb PM |
3777 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3778 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
3779 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
3780 | set->dlen) < 0) | |
3781 | goto nla_put_failure; | |
3782 | ||
f25ad2e9 PM |
3783 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3784 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3785 | goto nla_put_failure; | |
3786 | ||
8aeff920 PNA |
3787 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && |
3788 | nla_put_string(skb, NFTA_SET_ELEM_OBJREF, | |
3789 | (*nft_set_ext_obj(ext))->name) < 0) | |
3790 | goto nla_put_failure; | |
3791 | ||
fe2811eb PM |
3792 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3793 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3794 | htonl(*nft_set_ext_flags(ext)))) | |
3795 | goto nla_put_failure; | |
20a69341 | 3796 | |
c3e1b005 PM |
3797 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3798 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
8e1102d5 | 3799 | nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)), |
b46f6ded | 3800 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3801 | goto nla_put_failure; |
3802 | ||
3803 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
8e1102d5 | 3804 | u64 expires, now = get_jiffies_64(); |
c3e1b005 PM |
3805 | |
3806 | expires = *nft_set_ext_expiration(ext); | |
8e1102d5 | 3807 | if (time_before64(now, expires)) |
c3e1b005 PM |
3808 | expires -= now; |
3809 | else | |
3810 | expires = 0; | |
3811 | ||
3812 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
8e1102d5 | 3813 | nf_jiffies64_to_msecs(expires), |
b46f6ded | 3814 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3815 | goto nla_put_failure; |
3816 | } | |
3817 | ||
68e942e8 PM |
3818 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3819 | struct nft_userdata *udata; | |
3820 | ||
3821 | udata = nft_set_ext_userdata(ext); | |
3822 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3823 | udata->len + 1, udata->data)) | |
3824 | goto nla_put_failure; | |
3825 | } | |
3826 | ||
20a69341 PM |
3827 | nla_nest_end(skb, nest); |
3828 | return 0; | |
3829 | ||
3830 | nla_put_failure: | |
3831 | nlmsg_trim(skb, b); | |
3832 | return -EMSGSIZE; | |
3833 | } | |
3834 | ||
3835 | struct nft_set_dump_args { | |
3836 | const struct netlink_callback *cb; | |
3837 | struct nft_set_iter iter; | |
3838 | struct sk_buff *skb; | |
3839 | }; | |
3840 | ||
3841 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
de70185d | 3842 | struct nft_set *set, |
20a69341 | 3843 | const struct nft_set_iter *iter, |
de70185d | 3844 | struct nft_set_elem *elem) |
20a69341 PM |
3845 | { |
3846 | struct nft_set_dump_args *args; | |
3847 | ||
3848 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3849 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3850 | } | |
3851 | ||
fa803605 LZ |
3852 | struct nft_set_dump_ctx { |
3853 | const struct nft_set *set; | |
3854 | struct nft_ctx ctx; | |
3855 | }; | |
3856 | ||
20a69341 PM |
3857 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
3858 | { | |
fa803605 | 3859 | struct nft_set_dump_ctx *dump_ctx = cb->data; |
633c9a84 | 3860 | struct net *net = sock_net(skb->sk); |
fa803605 | 3861 | struct nft_table *table; |
de70185d | 3862 | struct nft_set *set; |
20a69341 | 3863 | struct nft_set_dump_args args; |
fa803605 | 3864 | bool set_found = false; |
20a69341 PM |
3865 | struct nfgenmsg *nfmsg; |
3866 | struct nlmsghdr *nlh; | |
3867 | struct nlattr *nest; | |
3868 | u32 portid, seq; | |
fa803605 | 3869 | int event; |
20a69341 | 3870 | |
fa803605 | 3871 | rcu_read_lock(); |
36596dad PNA |
3872 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
3873 | if (dump_ctx->ctx.family != NFPROTO_UNSPEC && | |
98319cb9 | 3874 | dump_ctx->ctx.family != table->family) |
fa803605 | 3875 | continue; |
20a69341 | 3876 | |
36596dad PNA |
3877 | if (table != dump_ctx->ctx.table) |
3878 | continue; | |
20a69341 | 3879 | |
36596dad PNA |
3880 | list_for_each_entry_rcu(set, &table->sets, list) { |
3881 | if (set == dump_ctx->set) { | |
3882 | set_found = true; | |
3883 | break; | |
fa803605 | 3884 | } |
fa803605 LZ |
3885 | } |
3886 | break; | |
3887 | } | |
3888 | ||
3889 | if (!set_found) { | |
3890 | rcu_read_unlock(); | |
3891 | return -ENOENT; | |
3892 | } | |
20a69341 | 3893 | |
dedb67c4 | 3894 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); |
20a69341 PM |
3895 | portid = NETLINK_CB(cb->skb).portid; |
3896 | seq = cb->nlh->nlmsg_seq; | |
3897 | ||
3898 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3899 | NLM_F_MULTI); | |
3900 | if (nlh == NULL) | |
3901 | goto nla_put_failure; | |
3902 | ||
3903 | nfmsg = nlmsg_data(nlh); | |
98319cb9 | 3904 | nfmsg->nfgen_family = table->family; |
20a69341 | 3905 | nfmsg->version = NFNETLINK_V0; |
fa803605 | 3906 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
20a69341 | 3907 | |
fa803605 | 3908 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) |
20a69341 PM |
3909 | goto nla_put_failure; |
3910 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3911 | goto nla_put_failure; | |
3912 | ||
3913 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3914 | if (nest == NULL) | |
3915 | goto nla_put_failure; | |
3916 | ||
8588ac09 PNA |
3917 | args.cb = cb; |
3918 | args.skb = skb; | |
fa803605 | 3919 | args.iter.genmask = nft_genmask_cur(net); |
8588ac09 PNA |
3920 | args.iter.skip = cb->args[0]; |
3921 | args.iter.count = 0; | |
3922 | args.iter.err = 0; | |
3923 | args.iter.fn = nf_tables_dump_setelem; | |
fa803605 LZ |
3924 | set->ops->walk(&dump_ctx->ctx, set, &args.iter); |
3925 | rcu_read_unlock(); | |
20a69341 PM |
3926 | |
3927 | nla_nest_end(skb, nest); | |
3928 | nlmsg_end(skb, nlh); | |
3929 | ||
3930 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3931 | return args.iter.err; | |
3932 | if (args.iter.count == cb->args[0]) | |
3933 | return 0; | |
3934 | ||
3935 | cb->args[0] = args.iter.count; | |
3936 | return skb->len; | |
3937 | ||
3938 | nla_put_failure: | |
fa803605 | 3939 | rcu_read_unlock(); |
20a69341 PM |
3940 | return -ENOSPC; |
3941 | } | |
3942 | ||
90fd131a FW |
3943 | static int nf_tables_dump_set_start(struct netlink_callback *cb) |
3944 | { | |
3945 | struct nft_set_dump_ctx *dump_ctx = cb->data; | |
3946 | ||
3947 | cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC); | |
3948 | ||
3949 | return cb->data ? 0 : -ENOMEM; | |
3950 | } | |
3951 | ||
fa803605 LZ |
3952 | static int nf_tables_dump_set_done(struct netlink_callback *cb) |
3953 | { | |
3954 | kfree(cb->data); | |
3955 | return 0; | |
3956 | } | |
3957 | ||
d60ce62f AB |
3958 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
3959 | const struct nft_ctx *ctx, u32 seq, | |
3960 | u32 portid, int event, u16 flags, | |
3961 | const struct nft_set *set, | |
3962 | const struct nft_set_elem *elem) | |
3963 | { | |
3964 | struct nfgenmsg *nfmsg; | |
3965 | struct nlmsghdr *nlh; | |
3966 | struct nlattr *nest; | |
3967 | int err; | |
3968 | ||
dedb67c4 | 3969 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
d60ce62f AB |
3970 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
3971 | flags); | |
3972 | if (nlh == NULL) | |
3973 | goto nla_put_failure; | |
3974 | ||
3975 | nfmsg = nlmsg_data(nlh); | |
36596dad | 3976 | nfmsg->nfgen_family = ctx->family; |
d60ce62f | 3977 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 3978 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
3979 | |
3980 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3981 | goto nla_put_failure; | |
3982 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3983 | goto nla_put_failure; | |
3984 | ||
3985 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3986 | if (nest == NULL) | |
3987 | goto nla_put_failure; | |
3988 | ||
3989 | err = nf_tables_fill_setelem(skb, set, elem); | |
3990 | if (err < 0) | |
3991 | goto nla_put_failure; | |
3992 | ||
3993 | nla_nest_end(skb, nest); | |
3994 | ||
053c095a JB |
3995 | nlmsg_end(skb, nlh); |
3996 | return 0; | |
d60ce62f AB |
3997 | |
3998 | nla_put_failure: | |
3999 | nlmsg_trim(skb, nlh); | |
4000 | return -1; | |
4001 | } | |
4002 | ||
ba0e4d99 PNA |
4003 | static int nft_setelem_parse_flags(const struct nft_set *set, |
4004 | const struct nlattr *attr, u32 *flags) | |
4005 | { | |
4006 | if (attr == NULL) | |
4007 | return 0; | |
4008 | ||
4009 | *flags = ntohl(nla_get_be32(attr)); | |
4010 | if (*flags & ~NFT_SET_ELEM_INTERVAL_END) | |
4011 | return -EINVAL; | |
4012 | if (!(set->flags & NFT_SET_INTERVAL) && | |
4013 | *flags & NFT_SET_ELEM_INTERVAL_END) | |
4014 | return -EINVAL; | |
4015 | ||
4016 | return 0; | |
4017 | } | |
4018 | ||
4019 | static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set, | |
4020 | const struct nlattr *attr) | |
4021 | { | |
4022 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
ba0e4d99 PNA |
4023 | struct nft_data_desc desc; |
4024 | struct nft_set_elem elem; | |
4025 | struct sk_buff *skb; | |
4026 | uint32_t flags = 0; | |
4027 | void *priv; | |
4028 | int err; | |
4029 | ||
4030 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
4031 | nft_set_elem_policy, NULL); | |
4032 | if (err < 0) | |
4033 | return err; | |
4034 | ||
4035 | if (!nla[NFTA_SET_ELEM_KEY]) | |
4036 | return -EINVAL; | |
4037 | ||
4038 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
4039 | if (err < 0) | |
4040 | return err; | |
4041 | ||
4042 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, | |
4043 | nla[NFTA_SET_ELEM_KEY]); | |
4044 | if (err < 0) | |
4045 | return err; | |
4046 | ||
4047 | err = -EINVAL; | |
4048 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
4049 | return err; | |
4050 | ||
4051 | priv = set->ops->get(ctx->net, set, &elem, flags); | |
4052 | if (IS_ERR(priv)) | |
4053 | return PTR_ERR(priv); | |
4054 | ||
4055 | elem.priv = priv; | |
ba0e4d99 PNA |
4056 | |
4057 | err = -ENOMEM; | |
d9adf22a | 4058 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); |
ba0e4d99 PNA |
4059 | if (skb == NULL) |
4060 | goto err1; | |
4061 | ||
4062 | err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid, | |
4063 | NFT_MSG_NEWSETELEM, 0, set, &elem); | |
4064 | if (err < 0) | |
4065 | goto err2; | |
4066 | ||
4067 | err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT); | |
4068 | /* This avoids a loop in nfnetlink. */ | |
4069 | if (err < 0) | |
4070 | goto err1; | |
4071 | ||
4072 | return 0; | |
4073 | err2: | |
4074 | kfree_skb(skb); | |
4075 | err1: | |
4076 | /* this avoids a loop in nfnetlink. */ | |
4077 | return err == -EAGAIN ? -ENOBUFS : err; | |
4078 | } | |
4079 | ||
d9adf22a | 4080 | /* called with rcu_read_lock held */ |
ba0e4d99 PNA |
4081 | static int nf_tables_getsetelem(struct net *net, struct sock *nlsk, |
4082 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
4083 | const struct nlattr * const nla[], | |
4084 | struct netlink_ext_ack *extack) | |
4085 | { | |
4086 | u8 genmask = nft_genmask_cur(net); | |
4087 | struct nft_set *set; | |
4088 | struct nlattr *attr; | |
4089 | struct nft_ctx ctx; | |
4090 | int rem, err = 0; | |
4091 | ||
36dd1bcc PNA |
4092 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack, |
4093 | genmask); | |
ba0e4d99 PNA |
4094 | if (err < 0) |
4095 | return err; | |
4096 | ||
cac20fcd | 4097 | set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask); |
ba0e4d99 PNA |
4098 | if (IS_ERR(set)) |
4099 | return PTR_ERR(set); | |
4100 | ||
4101 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
4102 | struct netlink_dump_control c = { | |
90fd131a | 4103 | .start = nf_tables_dump_set_start, |
ba0e4d99 PNA |
4104 | .dump = nf_tables_dump_set, |
4105 | .done = nf_tables_dump_set_done, | |
d9adf22a | 4106 | .module = THIS_MODULE, |
ba0e4d99 | 4107 | }; |
90fd131a FW |
4108 | struct nft_set_dump_ctx dump_ctx = { |
4109 | .set = set, | |
4110 | .ctx = ctx, | |
4111 | }; | |
ba0e4d99 | 4112 | |
90fd131a | 4113 | c.data = &dump_ctx; |
d9adf22a | 4114 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
ba0e4d99 PNA |
4115 | } |
4116 | ||
4117 | if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) | |
4118 | return -EINVAL; | |
4119 | ||
4120 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
4121 | err = nft_get_set_elem(&ctx, set, attr); | |
4122 | if (err < 0) | |
4123 | break; | |
4124 | } | |
4125 | ||
4126 | return err; | |
4127 | } | |
4128 | ||
25e94a99 PNA |
4129 | static void nf_tables_setelem_notify(const struct nft_ctx *ctx, |
4130 | const struct nft_set *set, | |
4131 | const struct nft_set_elem *elem, | |
4132 | int event, u16 flags) | |
d60ce62f | 4133 | { |
128ad332 PNA |
4134 | struct net *net = ctx->net; |
4135 | u32 portid = ctx->portid; | |
d60ce62f AB |
4136 | struct sk_buff *skb; |
4137 | int err; | |
4138 | ||
128ad332 | 4139 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
25e94a99 | 4140 | return; |
d60ce62f | 4141 | |
d60ce62f AB |
4142 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
4143 | if (skb == NULL) | |
4144 | goto err; | |
4145 | ||
4146 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
4147 | set, elem); | |
4148 | if (err < 0) { | |
4149 | kfree_skb(skb); | |
4150 | goto err; | |
4151 | } | |
4152 | ||
25e94a99 PNA |
4153 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
4154 | GFP_KERNEL); | |
4155 | return; | |
d60ce62f | 4156 | err: |
25e94a99 | 4157 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
d60ce62f AB |
4158 | } |
4159 | ||
60319eb1 PNA |
4160 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
4161 | int msg_type, | |
4162 | struct nft_set *set) | |
4163 | { | |
4164 | struct nft_trans *trans; | |
4165 | ||
4166 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
4167 | if (trans == NULL) | |
4168 | return NULL; | |
4169 | ||
4170 | nft_trans_elem_set(trans) = set; | |
4171 | return trans; | |
4172 | } | |
4173 | ||
22fe54d5 PM |
4174 | void *nft_set_elem_init(const struct nft_set *set, |
4175 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 4176 | const u32 *key, const u32 *data, |
22fe54d5 | 4177 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
4178 | { |
4179 | struct nft_set_ext *ext; | |
4180 | void *elem; | |
4181 | ||
4182 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
4183 | if (elem == NULL) | |
4184 | return NULL; | |
4185 | ||
4186 | ext = nft_set_elem_ext(set, elem); | |
4187 | nft_set_ext_init(ext, tmpl); | |
4188 | ||
4189 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
4190 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4191 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
4192 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
4193 | *nft_set_ext_expiration(ext) = | |
8e1102d5 | 4194 | get_jiffies_64() + timeout; |
c3e1b005 PM |
4195 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) |
4196 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
4197 | |
4198 | return elem; | |
4199 | } | |
4200 | ||
61f9e292 LZ |
4201 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
4202 | bool destroy_expr) | |
61edafbb PM |
4203 | { |
4204 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3453c927 PNA |
4205 | struct nft_ctx ctx = { |
4206 | .net = read_pnet(&set->net), | |
4207 | .family = set->table->family, | |
4208 | }; | |
61edafbb | 4209 | |
59105446 | 4210 | nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); |
61edafbb | 4211 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) |
59105446 | 4212 | nft_data_release(nft_set_ext_data(ext), set->dtype); |
371ebcbb PNA |
4213 | if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) { |
4214 | struct nft_expr *expr = nft_set_ext_expr(ext); | |
4215 | ||
4216 | if (expr->ops->destroy_clone) { | |
4217 | expr->ops->destroy_clone(&ctx, expr); | |
4218 | module_put(expr->ops->type->owner); | |
4219 | } else { | |
4220 | nf_tables_expr_destroy(&ctx, expr); | |
4221 | } | |
4222 | } | |
8aeff920 PNA |
4223 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) |
4224 | (*nft_set_ext_obj(ext))->use--; | |
61edafbb PM |
4225 | kfree(elem); |
4226 | } | |
4227 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
4228 | ||
59105446 PNA |
4229 | /* Only called from commit path, nft_set_elem_deactivate() already deals with |
4230 | * the refcounting from the preparation phase. | |
4231 | */ | |
3453c927 PNA |
4232 | static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, |
4233 | const struct nft_set *set, void *elem) | |
59105446 PNA |
4234 | { |
4235 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
4236 | ||
4237 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) | |
3453c927 | 4238 | nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext)); |
59105446 PNA |
4239 | kfree(elem); |
4240 | } | |
4241 | ||
60319eb1 | 4242 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
c016c7e4 | 4243 | const struct nlattr *attr, u32 nlmsg_flags) |
20a69341 PM |
4244 | { |
4245 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
8aeff920 | 4246 | u8 genmask = nft_genmask_next(ctx->net); |
20a69341 | 4247 | struct nft_data_desc d1, d2; |
fe2811eb | 4248 | struct nft_set_ext_tmpl tmpl; |
c016c7e4 | 4249 | struct nft_set_ext *ext, *ext2; |
20a69341 PM |
4250 | struct nft_set_elem elem; |
4251 | struct nft_set_binding *binding; | |
8aeff920 | 4252 | struct nft_object *obj = NULL; |
68e942e8 | 4253 | struct nft_userdata *udata; |
fe2811eb | 4254 | struct nft_data data; |
20a69341 | 4255 | enum nft_registers dreg; |
60319eb1 | 4256 | struct nft_trans *trans; |
0e9091d6 | 4257 | u32 flags = 0; |
c3e1b005 | 4258 | u64 timeout; |
68e942e8 | 4259 | u8 ulen; |
20a69341 PM |
4260 | int err; |
4261 | ||
4262 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 4263 | nft_set_elem_policy, NULL); |
20a69341 PM |
4264 | if (err < 0) |
4265 | return err; | |
4266 | ||
4267 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
4268 | return -EINVAL; | |
4269 | ||
fe2811eb PM |
4270 | nft_set_ext_prepare(&tmpl); |
4271 | ||
0e9091d6 PNA |
4272 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); |
4273 | if (err < 0) | |
4274 | return err; | |
4275 | if (flags != 0) | |
4276 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
4277 | |
4278 | if (set->flags & NFT_SET_MAP) { | |
4279 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 4280 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 4281 | return -EINVAL; |
bd7fc645 | 4282 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 4283 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 4284 | return -EINVAL; |
20a69341 PM |
4285 | } else { |
4286 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
4287 | return -EINVAL; | |
4288 | } | |
4289 | ||
c3e1b005 PM |
4290 | timeout = 0; |
4291 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
4292 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
4293 | return -EINVAL; | |
8e1102d5 FW |
4294 | err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT], |
4295 | &timeout); | |
4296 | if (err) | |
4297 | return err; | |
c3e1b005 PM |
4298 | } else if (set->flags & NFT_SET_TIMEOUT) { |
4299 | timeout = set->timeout; | |
4300 | } | |
4301 | ||
7d740264 | 4302 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 4303 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
4304 | if (err < 0) |
4305 | goto err1; | |
4306 | err = -EINVAL; | |
4307 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
4308 | goto err2; | |
4309 | ||
7d740264 | 4310 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
4311 | if (timeout > 0) { |
4312 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
4313 | if (timeout != set->timeout) | |
4314 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
4315 | } | |
fe2811eb | 4316 | |
8aeff920 PNA |
4317 | if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { |
4318 | if (!(set->flags & NFT_SET_OBJECT)) { | |
4319 | err = -EINVAL; | |
4320 | goto err2; | |
4321 | } | |
cac20fcd PNA |
4322 | obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF], |
4323 | set->objtype, genmask); | |
8aeff920 PNA |
4324 | if (IS_ERR(obj)) { |
4325 | err = PTR_ERR(obj); | |
4326 | goto err2; | |
4327 | } | |
4328 | nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); | |
4329 | } | |
4330 | ||
20a69341 | 4331 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
4332 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
4333 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
4334 | if (err < 0) |
4335 | goto err2; | |
4336 | ||
4337 | err = -EINVAL; | |
4338 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
4339 | goto err3; | |
4340 | ||
4341 | dreg = nft_type_to_reg(set->dtype); | |
4342 | list_for_each_entry(binding, &set->bindings, list) { | |
4343 | struct nft_ctx bind_ctx = { | |
58c78e10 | 4344 | .net = ctx->net, |
36596dad | 4345 | .family = ctx->family, |
20a69341 | 4346 | .table = ctx->table, |
7c95f6d8 | 4347 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
4348 | }; |
4349 | ||
11113e19 PM |
4350 | if (!(binding->flags & NFT_SET_MAP)) |
4351 | continue; | |
4352 | ||
1ec10212 PM |
4353 | err = nft_validate_register_store(&bind_ctx, dreg, |
4354 | &data, | |
4355 | d2.type, d2.len); | |
20a69341 PM |
4356 | if (err < 0) |
4357 | goto err3; | |
a654de8f PNA |
4358 | |
4359 | if (d2.type == NFT_DATA_VERDICT && | |
4360 | (data.verdict.code == NFT_GOTO || | |
4361 | data.verdict.code == NFT_JUMP)) | |
4362 | nft_validate_state_update(ctx->net, | |
4363 | NFT_VALIDATE_NEED); | |
20a69341 | 4364 | } |
fe2811eb | 4365 | |
7d740264 | 4366 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
4367 | } |
4368 | ||
68e942e8 PM |
4369 | /* The full maximum length of userdata can exceed the maximum |
4370 | * offset value (U8_MAX) for following extensions, therefor it | |
4371 | * must be the last extension added. | |
4372 | */ | |
4373 | ulen = 0; | |
4374 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
4375 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
4376 | if (ulen > 0) | |
4377 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
4378 | ulen); | |
4379 | } | |
4380 | ||
fe2811eb | 4381 | err = -ENOMEM; |
7d740264 | 4382 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 4383 | timeout, GFP_KERNEL); |
fe2811eb PM |
4384 | if (elem.priv == NULL) |
4385 | goto err3; | |
4386 | ||
4387 | ext = nft_set_elem_ext(set, elem.priv); | |
4388 | if (flags) | |
4389 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
4390 | if (ulen > 0) { |
4391 | udata = nft_set_ext_userdata(ext); | |
4392 | udata->len = ulen - 1; | |
4393 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
4394 | } | |
8aeff920 PNA |
4395 | if (obj) { |
4396 | *nft_set_ext_obj(ext) = obj; | |
4397 | obj->use++; | |
4398 | } | |
fe2811eb | 4399 | |
60319eb1 PNA |
4400 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
4401 | if (trans == NULL) | |
fe2811eb | 4402 | goto err4; |
60319eb1 | 4403 | |
69086658 | 4404 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
c016c7e4 PNA |
4405 | err = set->ops->insert(ctx->net, set, &elem, &ext2); |
4406 | if (err) { | |
4407 | if (err == -EEXIST) { | |
9744a6fc PNA |
4408 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ |
4409 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || | |
4410 | nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ | |
f0dfd7a2 CIK |
4411 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) { |
4412 | err = -EBUSY; | |
4413 | goto err5; | |
4414 | } | |
8aeff920 PNA |
4415 | if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
4416 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && | |
4417 | memcmp(nft_set_ext_data(ext), | |
4418 | nft_set_ext_data(ext2), set->dlen) != 0) || | |
4419 | (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && | |
4420 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && | |
4421 | *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) | |
c016c7e4 PNA |
4422 | err = -EBUSY; |
4423 | else if (!(nlmsg_flags & NLM_F_EXCL)) | |
4424 | err = 0; | |
4425 | } | |
fe2811eb | 4426 | goto err5; |
c016c7e4 | 4427 | } |
20a69341 | 4428 | |
35d0ac90 PNA |
4429 | if (set->size && |
4430 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { | |
4431 | err = -ENFILE; | |
4432 | goto err6; | |
4433 | } | |
4434 | ||
60319eb1 | 4435 | nft_trans_elem(trans) = elem; |
46bbafce | 4436 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
4437 | return 0; |
4438 | ||
35d0ac90 | 4439 | err6: |
5cb82a38 | 4440 | set->ops->remove(ctx->net, set, &elem); |
fe2811eb | 4441 | err5: |
60319eb1 | 4442 | kfree(trans); |
fe2811eb PM |
4443 | err4: |
4444 | kfree(elem.priv); | |
20a69341 PM |
4445 | err3: |
4446 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
59105446 | 4447 | nft_data_release(&data, d2.type); |
20a69341 | 4448 | err2: |
59105446 | 4449 | nft_data_release(&elem.key.val, d1.type); |
20a69341 PM |
4450 | err1: |
4451 | return err; | |
4452 | } | |
4453 | ||
633c9a84 PNA |
4454 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
4455 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4456 | const struct nlattr * const nla[], |
4457 | struct netlink_ext_ack *extack) | |
20a69341 | 4458 | { |
f2a6d766 | 4459 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4460 | const struct nlattr *attr; |
4461 | struct nft_set *set; | |
4462 | struct nft_ctx ctx; | |
a654de8f | 4463 | int rem, err; |
20a69341 | 4464 | |
7d5570ca PNA |
4465 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
4466 | return -EINVAL; | |
4467 | ||
36dd1bcc PNA |
4468 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack, |
4469 | genmask); | |
20a69341 PM |
4470 | if (err < 0) |
4471 | return err; | |
4472 | ||
a3073c17 PNA |
4473 | set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
4474 | nla[NFTA_SET_ELEM_LIST_SET_ID], genmask); | |
4475 | if (IS_ERR(set)) | |
4476 | return PTR_ERR(set); | |
958bee14 | 4477 | |
20a69341 PM |
4478 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
4479 | return -EBUSY; | |
4480 | ||
4481 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
c016c7e4 | 4482 | err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags); |
35d0ac90 | 4483 | if (err < 0) |
a654de8f | 4484 | return err; |
20a69341 | 4485 | } |
a654de8f PNA |
4486 | |
4487 | if (net->nft.validate_state == NFT_VALIDATE_DO) | |
4488 | return nft_table_validate(net, ctx.table); | |
4489 | ||
4490 | return 0; | |
20a69341 PM |
4491 | } |
4492 | ||
59105446 PNA |
4493 | /** |
4494 | * nft_data_hold - hold a nft_data item | |
4495 | * | |
4496 | * @data: struct nft_data to release | |
4497 | * @type: type of data | |
4498 | * | |
4499 | * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
4500 | * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and | |
4501 | * NFT_GOTO verdicts. This function must be called on active data objects | |
4502 | * from the second phase of the commit protocol. | |
4503 | */ | |
bb7b40ae | 4504 | void nft_data_hold(const struct nft_data *data, enum nft_data_types type) |
59105446 PNA |
4505 | { |
4506 | if (type == NFT_DATA_VERDICT) { | |
4507 | switch (data->verdict.code) { | |
4508 | case NFT_JUMP: | |
4509 | case NFT_GOTO: | |
4510 | data->verdict.chain->use++; | |
4511 | break; | |
4512 | } | |
4513 | } | |
4514 | } | |
4515 | ||
4516 | static void nft_set_elem_activate(const struct net *net, | |
4517 | const struct nft_set *set, | |
4518 | struct nft_set_elem *elem) | |
4519 | { | |
4520 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4521 | ||
4522 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4523 | nft_data_hold(nft_set_ext_data(ext), set->dtype); | |
4524 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4525 | (*nft_set_ext_obj(ext))->use++; | |
4526 | } | |
4527 | ||
4528 | static void nft_set_elem_deactivate(const struct net *net, | |
4529 | const struct nft_set *set, | |
4530 | struct nft_set_elem *elem) | |
4531 | { | |
4532 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4533 | ||
4534 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4535 | nft_data_release(nft_set_ext_data(ext), set->dtype); | |
4536 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4537 | (*nft_set_ext_obj(ext))->use--; | |
4538 | } | |
4539 | ||
60319eb1 | 4540 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
4541 | const struct nlattr *attr) |
4542 | { | |
4543 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3971ca14 | 4544 | struct nft_set_ext_tmpl tmpl; |
20a69341 PM |
4545 | struct nft_data_desc desc; |
4546 | struct nft_set_elem elem; | |
3971ca14 | 4547 | struct nft_set_ext *ext; |
60319eb1 | 4548 | struct nft_trans *trans; |
3971ca14 PNA |
4549 | u32 flags = 0; |
4550 | void *priv; | |
20a69341 PM |
4551 | int err; |
4552 | ||
4553 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 4554 | nft_set_elem_policy, NULL); |
20a69341 PM |
4555 | if (err < 0) |
4556 | goto err1; | |
4557 | ||
4558 | err = -EINVAL; | |
4559 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
4560 | goto err1; | |
4561 | ||
3971ca14 PNA |
4562 | nft_set_ext_prepare(&tmpl); |
4563 | ||
4564 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
4565 | if (err < 0) | |
4566 | return err; | |
4567 | if (flags != 0) | |
4568 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
4569 | ||
7d740264 | 4570 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 4571 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
4572 | if (err < 0) |
4573 | goto err1; | |
4574 | ||
4575 | err = -EINVAL; | |
4576 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
4577 | goto err2; | |
4578 | ||
3971ca14 PNA |
4579 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len); |
4580 | ||
4581 | err = -ENOMEM; | |
4582 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0, | |
4583 | GFP_KERNEL); | |
4584 | if (elem.priv == NULL) | |
4585 | goto err2; | |
4586 | ||
4587 | ext = nft_set_elem_ext(set, elem.priv); | |
4588 | if (flags) | |
4589 | *nft_set_ext_flags(ext) = flags; | |
4590 | ||
60319eb1 | 4591 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
4592 | if (trans == NULL) { |
4593 | err = -ENOMEM; | |
3971ca14 | 4594 | goto err3; |
609ccf08 | 4595 | } |
20a69341 | 4596 | |
42a55769 | 4597 | priv = set->ops->deactivate(ctx->net, set, &elem); |
3971ca14 | 4598 | if (priv == NULL) { |
cc02e457 | 4599 | err = -ENOENT; |
3971ca14 | 4600 | goto err4; |
cc02e457 | 4601 | } |
3971ca14 PNA |
4602 | kfree(elem.priv); |
4603 | elem.priv = priv; | |
cc02e457 | 4604 | |
59105446 PNA |
4605 | nft_set_elem_deactivate(ctx->net, set, &elem); |
4606 | ||
60319eb1 | 4607 | nft_trans_elem(trans) = elem; |
46bbafce | 4608 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 4609 | return 0; |
cc02e457 | 4610 | |
3971ca14 | 4611 | err4: |
cc02e457 | 4612 | kfree(trans); |
3971ca14 PNA |
4613 | err3: |
4614 | kfree(elem.priv); | |
20a69341 | 4615 | err2: |
59105446 | 4616 | nft_data_release(&elem.key.val, desc.type); |
20a69341 PM |
4617 | err1: |
4618 | return err; | |
4619 | } | |
4620 | ||
8411b644 | 4621 | static int nft_flush_set(const struct nft_ctx *ctx, |
de70185d | 4622 | struct nft_set *set, |
8411b644 | 4623 | const struct nft_set_iter *iter, |
de70185d | 4624 | struct nft_set_elem *elem) |
8411b644 PNA |
4625 | { |
4626 | struct nft_trans *trans; | |
4627 | int err; | |
4628 | ||
4629 | trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, | |
4630 | sizeof(struct nft_trans_elem), GFP_ATOMIC); | |
4631 | if (!trans) | |
4632 | return -ENOMEM; | |
4633 | ||
1ba1c414 | 4634 | if (!set->ops->flush(ctx->net, set, elem->priv)) { |
8411b644 PNA |
4635 | err = -ENOENT; |
4636 | goto err1; | |
4637 | } | |
b2c11e4b | 4638 | set->ndeact++; |
8411b644 | 4639 | |
7acfda53 | 4640 | nft_set_elem_deactivate(ctx->net, set, elem); |
de70185d PNA |
4641 | nft_trans_elem_set(trans) = set; |
4642 | nft_trans_elem(trans) = *elem; | |
8411b644 PNA |
4643 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
4644 | ||
4645 | return 0; | |
4646 | err1: | |
4647 | kfree(trans); | |
4648 | return err; | |
4649 | } | |
4650 | ||
633c9a84 PNA |
4651 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
4652 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4653 | const struct nlattr * const nla[], |
4654 | struct netlink_ext_ack *extack) | |
20a69341 | 4655 | { |
f2a6d766 | 4656 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4657 | const struct nlattr *attr; |
4658 | struct nft_set *set; | |
4659 | struct nft_ctx ctx; | |
60319eb1 | 4660 | int rem, err = 0; |
20a69341 | 4661 | |
36dd1bcc PNA |
4662 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack, |
4663 | genmask); | |
20a69341 PM |
4664 | if (err < 0) |
4665 | return err; | |
4666 | ||
cac20fcd | 4667 | set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask); |
20a69341 PM |
4668 | if (IS_ERR(set)) |
4669 | return PTR_ERR(set); | |
4670 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
4671 | return -EBUSY; | |
4672 | ||
8411b644 | 4673 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) { |
baa2d42c PNA |
4674 | struct nft_set_iter iter = { |
4675 | .genmask = genmask, | |
4676 | .fn = nft_flush_set, | |
8411b644 | 4677 | }; |
baa2d42c | 4678 | set->ops->walk(&ctx, set, &iter); |
8411b644 | 4679 | |
baa2d42c | 4680 | return iter.err; |
8411b644 PNA |
4681 | } |
4682 | ||
20a69341 PM |
4683 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
4684 | err = nft_del_setelem(&ctx, set, attr); | |
4685 | if (err < 0) | |
60319eb1 | 4686 | break; |
4fefee57 | 4687 | |
3dd0673a | 4688 | set->ndeact++; |
20a69341 | 4689 | } |
60319eb1 | 4690 | return err; |
20a69341 PM |
4691 | } |
4692 | ||
cfed7e1b PM |
4693 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
4694 | { | |
4695 | struct nft_set_gc_batch *gcb; | |
4696 | unsigned int i; | |
4697 | ||
4698 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
4699 | for (i = 0; i < gcb->head.cnt; i++) | |
61f9e292 | 4700 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); |
cfed7e1b PM |
4701 | kfree(gcb); |
4702 | } | |
4703 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
4704 | ||
4705 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
4706 | gfp_t gfp) | |
4707 | { | |
4708 | struct nft_set_gc_batch *gcb; | |
4709 | ||
4710 | gcb = kzalloc(sizeof(*gcb), gfp); | |
4711 | if (gcb == NULL) | |
4712 | return gcb; | |
4713 | gcb->head.set = set; | |
4714 | return gcb; | |
4715 | } | |
4716 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
4717 | ||
e5009240 PNA |
4718 | /* |
4719 | * Stateful objects | |
4720 | */ | |
4721 | ||
4722 | /** | |
4723 | * nft_register_obj- register nf_tables stateful object type | |
4724 | * @obj: object type | |
4725 | * | |
4726 | * Registers the object type for use with nf_tables. Returns zero on | |
4727 | * success or a negative errno code otherwise. | |
4728 | */ | |
4729 | int nft_register_obj(struct nft_object_type *obj_type) | |
4730 | { | |
4731 | if (obj_type->type == NFT_OBJECT_UNSPEC) | |
4732 | return -EINVAL; | |
4733 | ||
4734 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4735 | list_add_rcu(&obj_type->list, &nf_tables_objects); | |
4736 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4737 | return 0; | |
4738 | } | |
4739 | EXPORT_SYMBOL_GPL(nft_register_obj); | |
4740 | ||
4741 | /** | |
4742 | * nft_unregister_obj - unregister nf_tables object type | |
4743 | * @obj: object type | |
4744 | * | |
4745 | * Unregisters the object type for use with nf_tables. | |
4746 | */ | |
4747 | void nft_unregister_obj(struct nft_object_type *obj_type) | |
4748 | { | |
4749 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4750 | list_del_rcu(&obj_type->list); | |
4751 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4752 | } | |
4753 | EXPORT_SYMBOL_GPL(nft_unregister_obj); | |
4754 | ||
cac20fcd PNA |
4755 | struct nft_object *nft_obj_lookup(const struct nft_table *table, |
4756 | const struct nlattr *nla, u32 objtype, | |
4757 | u8 genmask) | |
e5009240 PNA |
4758 | { |
4759 | struct nft_object *obj; | |
4760 | ||
d9adf22a | 4761 | list_for_each_entry_rcu(obj, &table->objects, list) { |
e5009240 | 4762 | if (!nla_strcmp(nla, obj->name) && |
dfc46034 | 4763 | objtype == obj->ops->type->type && |
e5009240 PNA |
4764 | nft_active_genmask(obj, genmask)) |
4765 | return obj; | |
4766 | } | |
4767 | return ERR_PTR(-ENOENT); | |
4768 | } | |
cac20fcd | 4769 | EXPORT_SYMBOL_GPL(nft_obj_lookup); |
e5009240 | 4770 | |
cac20fcd PNA |
4771 | static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table, |
4772 | const struct nlattr *nla, | |
4773 | u32 objtype, u8 genmask) | |
3ecbfd65 HS |
4774 | { |
4775 | struct nft_object *obj; | |
4776 | ||
4777 | list_for_each_entry(obj, &table->objects, list) { | |
4778 | if (be64_to_cpu(nla_get_be64(nla)) == obj->handle && | |
4779 | objtype == obj->ops->type->type && | |
4780 | nft_active_genmask(obj, genmask)) | |
4781 | return obj; | |
4782 | } | |
4783 | return ERR_PTR(-ENOENT); | |
4784 | } | |
4785 | ||
e5009240 | 4786 | static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { |
b2fbd044 LZ |
4787 | [NFTA_OBJ_TABLE] = { .type = NLA_STRING, |
4788 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
4789 | [NFTA_OBJ_NAME] = { .type = NLA_STRING, | |
4790 | .len = NFT_OBJ_MAXNAMELEN - 1 }, | |
e5009240 PNA |
4791 | [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, |
4792 | [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, | |
3ecbfd65 | 4793 | [NFTA_OBJ_HANDLE] = { .type = NLA_U64}, |
e5009240 PNA |
4794 | }; |
4795 | ||
84fba055 FW |
4796 | static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, |
4797 | const struct nft_object_type *type, | |
e5009240 PNA |
4798 | const struct nlattr *attr) |
4799 | { | |
5b4c6e38 | 4800 | struct nlattr **tb; |
dfc46034 | 4801 | const struct nft_object_ops *ops; |
e5009240 | 4802 | struct nft_object *obj; |
5b4c6e38 GS |
4803 | int err = -ENOMEM; |
4804 | ||
4805 | tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL); | |
4806 | if (!tb) | |
4807 | goto err1; | |
e5009240 PNA |
4808 | |
4809 | if (attr) { | |
fceb6435 JB |
4810 | err = nla_parse_nested(tb, type->maxattr, attr, type->policy, |
4811 | NULL); | |
e5009240 | 4812 | if (err < 0) |
5b4c6e38 | 4813 | goto err2; |
e5009240 PNA |
4814 | } else { |
4815 | memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); | |
4816 | } | |
4817 | ||
dfc46034 PBG |
4818 | if (type->select_ops) { |
4819 | ops = type->select_ops(ctx, (const struct nlattr * const *)tb); | |
4820 | if (IS_ERR(ops)) { | |
4821 | err = PTR_ERR(ops); | |
5b4c6e38 | 4822 | goto err2; |
dfc46034 PBG |
4823 | } |
4824 | } else { | |
4825 | ops = type->ops; | |
4826 | } | |
4827 | ||
e5009240 | 4828 | err = -ENOMEM; |
dfc46034 | 4829 | obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL); |
5b4c6e38 GS |
4830 | if (!obj) |
4831 | goto err2; | |
e5009240 | 4832 | |
dfc46034 | 4833 | err = ops->init(ctx, (const struct nlattr * const *)tb, obj); |
e5009240 | 4834 | if (err < 0) |
5b4c6e38 | 4835 | goto err3; |
e5009240 | 4836 | |
dfc46034 PBG |
4837 | obj->ops = ops; |
4838 | ||
5b4c6e38 | 4839 | kfree(tb); |
e5009240 | 4840 | return obj; |
5b4c6e38 | 4841 | err3: |
e5009240 | 4842 | kfree(obj); |
5b4c6e38 GS |
4843 | err2: |
4844 | kfree(tb); | |
e5009240 PNA |
4845 | err1: |
4846 | return ERR_PTR(err); | |
4847 | } | |
4848 | ||
4849 | static int nft_object_dump(struct sk_buff *skb, unsigned int attr, | |
43da04a5 | 4850 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4851 | { |
4852 | struct nlattr *nest; | |
4853 | ||
4854 | nest = nla_nest_start(skb, attr); | |
4855 | if (!nest) | |
4856 | goto nla_put_failure; | |
dfc46034 | 4857 | if (obj->ops->dump(skb, obj, reset) < 0) |
e5009240 PNA |
4858 | goto nla_put_failure; |
4859 | nla_nest_end(skb, nest); | |
4860 | return 0; | |
4861 | ||
4862 | nla_put_failure: | |
4863 | return -1; | |
4864 | } | |
4865 | ||
4866 | static const struct nft_object_type *__nft_obj_type_get(u32 objtype) | |
4867 | { | |
4868 | const struct nft_object_type *type; | |
4869 | ||
4870 | list_for_each_entry(type, &nf_tables_objects, list) { | |
4871 | if (objtype == type->type) | |
4872 | return type; | |
4873 | } | |
4874 | return NULL; | |
4875 | } | |
4876 | ||
452238e8 FW |
4877 | static const struct nft_object_type * |
4878 | nft_obj_type_get(struct net *net, u32 objtype) | |
e5009240 PNA |
4879 | { |
4880 | const struct nft_object_type *type; | |
4881 | ||
4882 | type = __nft_obj_type_get(objtype); | |
4883 | if (type != NULL && try_module_get(type->owner)) | |
4884 | return type; | |
4885 | ||
f102d66b | 4886 | lockdep_nfnl_nft_mutex_not_held(); |
e5009240 PNA |
4887 | #ifdef CONFIG_MODULES |
4888 | if (type == NULL) { | |
452238e8 | 4889 | nft_request_module(net, "nft-obj-%u", objtype); |
e5009240 PNA |
4890 | if (__nft_obj_type_get(objtype)) |
4891 | return ERR_PTR(-EAGAIN); | |
4892 | } | |
4893 | #endif | |
4894 | return ERR_PTR(-ENOENT); | |
4895 | } | |
4896 | ||
4897 | static int nf_tables_newobj(struct net *net, struct sock *nlsk, | |
4898 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4899 | const struct nlattr * const nla[], |
4900 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4901 | { |
4902 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4903 | const struct nft_object_type *type; | |
4904 | u8 genmask = nft_genmask_next(net); | |
4905 | int family = nfmsg->nfgen_family; | |
e5009240 PNA |
4906 | struct nft_table *table; |
4907 | struct nft_object *obj; | |
4908 | struct nft_ctx ctx; | |
4909 | u32 objtype; | |
4910 | int err; | |
4911 | ||
4912 | if (!nla[NFTA_OBJ_TYPE] || | |
4913 | !nla[NFTA_OBJ_NAME] || | |
4914 | !nla[NFTA_OBJ_DATA]) | |
4915 | return -EINVAL; | |
4916 | ||
cac20fcd | 4917 | table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask); |
36dd1bcc PNA |
4918 | if (IS_ERR(table)) { |
4919 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); | |
e5009240 | 4920 | return PTR_ERR(table); |
36dd1bcc | 4921 | } |
e5009240 PNA |
4922 | |
4923 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
cac20fcd | 4924 | obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); |
e5009240 PNA |
4925 | if (IS_ERR(obj)) { |
4926 | err = PTR_ERR(obj); | |
36dd1bcc PNA |
4927 | if (err != -ENOENT) { |
4928 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); | |
e5009240 | 4929 | return err; |
36dd1bcc | 4930 | } |
1a28ad74 | 4931 | } else { |
36dd1bcc PNA |
4932 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
4933 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); | |
e5009240 | 4934 | return -EEXIST; |
36dd1bcc | 4935 | } |
e5009240 PNA |
4936 | return 0; |
4937 | } | |
4938 | ||
98319cb9 | 4939 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e5009240 | 4940 | |
452238e8 | 4941 | type = nft_obj_type_get(net, objtype); |
e5009240 PNA |
4942 | if (IS_ERR(type)) |
4943 | return PTR_ERR(type); | |
4944 | ||
84fba055 | 4945 | obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); |
e5009240 PNA |
4946 | if (IS_ERR(obj)) { |
4947 | err = PTR_ERR(obj); | |
4948 | goto err1; | |
4949 | } | |
18965317 | 4950 | obj->table = table; |
3ecbfd65 HS |
4951 | obj->handle = nf_tables_alloc_handle(table); |
4952 | ||
61509575 PS |
4953 | obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL); |
4954 | if (!obj->name) { | |
4955 | err = -ENOMEM; | |
4956 | goto err2; | |
4957 | } | |
e5009240 PNA |
4958 | |
4959 | err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); | |
4960 | if (err < 0) | |
61509575 | 4961 | goto err3; |
e5009240 PNA |
4962 | |
4963 | list_add_tail_rcu(&obj->list, &table->objects); | |
4964 | table->use++; | |
4965 | return 0; | |
61509575 PS |
4966 | err3: |
4967 | kfree(obj->name); | |
e5009240 | 4968 | err2: |
dfc46034 | 4969 | if (obj->ops->destroy) |
00bfb320 | 4970 | obj->ops->destroy(&ctx, obj); |
e5009240 PNA |
4971 | kfree(obj); |
4972 | err1: | |
4973 | module_put(type->owner); | |
4974 | return err; | |
4975 | } | |
4976 | ||
4977 | static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, | |
4978 | u32 portid, u32 seq, int event, u32 flags, | |
4979 | int family, const struct nft_table *table, | |
43da04a5 | 4980 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4981 | { |
4982 | struct nfgenmsg *nfmsg; | |
4983 | struct nlmsghdr *nlh; | |
4984 | ||
dedb67c4 | 4985 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
e5009240 PNA |
4986 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
4987 | if (nlh == NULL) | |
4988 | goto nla_put_failure; | |
4989 | ||
4990 | nfmsg = nlmsg_data(nlh); | |
4991 | nfmsg->nfgen_family = family; | |
4992 | nfmsg->version = NFNETLINK_V0; | |
4993 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4994 | ||
4995 | if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || | |
4996 | nla_put_string(skb, NFTA_OBJ_NAME, obj->name) || | |
dfc46034 | 4997 | nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) || |
e5009240 | 4998 | nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || |
3ecbfd65 HS |
4999 | nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) || |
5000 | nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle), | |
5001 | NFTA_OBJ_PAD)) | |
e5009240 PNA |
5002 | goto nla_put_failure; |
5003 | ||
5004 | nlmsg_end(skb, nlh); | |
5005 | return 0; | |
5006 | ||
5007 | nla_put_failure: | |
5008 | nlmsg_trim(skb, nlh); | |
5009 | return -1; | |
5010 | } | |
5011 | ||
a9fea2a3 | 5012 | struct nft_obj_filter { |
e46abbcc | 5013 | char *table; |
a9fea2a3 PNA |
5014 | u32 type; |
5015 | }; | |
5016 | ||
e5009240 PNA |
5017 | static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) |
5018 | { | |
5019 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
e5009240 | 5020 | const struct nft_table *table; |
e5009240 | 5021 | unsigned int idx = 0, s_idx = cb->args[0]; |
a9fea2a3 | 5022 | struct nft_obj_filter *filter = cb->data; |
e5009240 PNA |
5023 | struct net *net = sock_net(skb->sk); |
5024 | int family = nfmsg->nfgen_family; | |
43da04a5 PNA |
5025 | struct nft_object *obj; |
5026 | bool reset = false; | |
5027 | ||
5028 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) | |
5029 | reset = true; | |
e5009240 PNA |
5030 | |
5031 | rcu_read_lock(); | |
5032 | cb->seq = net->nft.base_seq; | |
5033 | ||
36596dad | 5034 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 5035 | if (family != NFPROTO_UNSPEC && family != table->family) |
e5009240 PNA |
5036 | continue; |
5037 | ||
36596dad PNA |
5038 | list_for_each_entry_rcu(obj, &table->objects, list) { |
5039 | if (!nft_is_active(net, obj)) | |
5040 | goto cont; | |
5041 | if (idx < s_idx) | |
5042 | goto cont; | |
5043 | if (idx > s_idx) | |
5044 | memset(&cb->args[1], 0, | |
5045 | sizeof(cb->args) - sizeof(cb->args[0])); | |
360cc79d | 5046 | if (filter && filter->table && |
36596dad PNA |
5047 | strcmp(filter->table, table->name)) |
5048 | goto cont; | |
5049 | if (filter && | |
5050 | filter->type != NFT_OBJECT_UNSPEC && | |
5051 | obj->ops->type->type != filter->type) | |
5052 | goto cont; | |
a9fea2a3 | 5053 | |
36596dad PNA |
5054 | if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, |
5055 | cb->nlh->nlmsg_seq, | |
5056 | NFT_MSG_NEWOBJ, | |
5057 | NLM_F_MULTI | NLM_F_APPEND, | |
98319cb9 | 5058 | table->family, table, |
36596dad PNA |
5059 | obj, reset) < 0) |
5060 | goto done; | |
e5009240 | 5061 | |
36596dad | 5062 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
e5009240 | 5063 | cont: |
36596dad | 5064 | idx++; |
e5009240 PNA |
5065 | } |
5066 | } | |
5067 | done: | |
5068 | rcu_read_unlock(); | |
5069 | ||
5070 | cb->args[0] = idx; | |
5071 | return skb->len; | |
5072 | } | |
5073 | ||
90fd131a | 5074 | static int nf_tables_dump_obj_start(struct netlink_callback *cb) |
a9fea2a3 | 5075 | { |
90fd131a FW |
5076 | const struct nlattr * const *nla = cb->data; |
5077 | struct nft_obj_filter *filter = NULL; | |
e46abbcc | 5078 | |
90fd131a FW |
5079 | if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) { |
5080 | filter = kzalloc(sizeof(*filter), GFP_ATOMIC); | |
5081 | if (!filter) | |
5082 | return -ENOMEM; | |
5083 | ||
5084 | if (nla[NFTA_OBJ_TABLE]) { | |
5085 | filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC); | |
5086 | if (!filter->table) { | |
5087 | kfree(filter); | |
5088 | return -ENOMEM; | |
5089 | } | |
5090 | } | |
5091 | ||
5092 | if (nla[NFTA_OBJ_TYPE]) | |
5093 | filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
8bea728d | 5094 | } |
a9fea2a3 | 5095 | |
90fd131a | 5096 | cb->data = filter; |
a9fea2a3 PNA |
5097 | return 0; |
5098 | } | |
5099 | ||
90fd131a | 5100 | static int nf_tables_dump_obj_done(struct netlink_callback *cb) |
a9fea2a3 | 5101 | { |
90fd131a | 5102 | struct nft_obj_filter *filter = cb->data; |
a9fea2a3 | 5103 | |
90fd131a FW |
5104 | if (filter) { |
5105 | kfree(filter->table); | |
5106 | kfree(filter); | |
e46abbcc | 5107 | } |
a9fea2a3 | 5108 | |
90fd131a | 5109 | return 0; |
a9fea2a3 PNA |
5110 | } |
5111 | ||
d9adf22a | 5112 | /* called with rcu_read_lock held */ |
e5009240 PNA |
5113 | static int nf_tables_getobj(struct net *net, struct sock *nlsk, |
5114 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
5115 | const struct nlattr * const nla[], |
5116 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
5117 | { |
5118 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5119 | u8 genmask = nft_genmask_cur(net); | |
5120 | int family = nfmsg->nfgen_family; | |
e5009240 PNA |
5121 | const struct nft_table *table; |
5122 | struct nft_object *obj; | |
5123 | struct sk_buff *skb2; | |
43da04a5 | 5124 | bool reset = false; |
e5009240 PNA |
5125 | u32 objtype; |
5126 | int err; | |
5127 | ||
5128 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
5129 | struct netlink_dump_control c = { | |
90fd131a | 5130 | .start = nf_tables_dump_obj_start, |
e5009240 | 5131 | .dump = nf_tables_dump_obj, |
a9fea2a3 | 5132 | .done = nf_tables_dump_obj_done, |
d9adf22a | 5133 | .module = THIS_MODULE, |
90fd131a | 5134 | .data = (void *)nla, |
e5009240 | 5135 | }; |
a9fea2a3 | 5136 | |
d9adf22a | 5137 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
e5009240 PNA |
5138 | } |
5139 | ||
5140 | if (!nla[NFTA_OBJ_NAME] || | |
5141 | !nla[NFTA_OBJ_TYPE]) | |
5142 | return -EINVAL; | |
5143 | ||
cac20fcd | 5144 | table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask); |
36dd1bcc PNA |
5145 | if (IS_ERR(table)) { |
5146 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); | |
e5009240 | 5147 | return PTR_ERR(table); |
36dd1bcc | 5148 | } |
e5009240 PNA |
5149 | |
5150 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
cac20fcd | 5151 | obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); |
36dd1bcc PNA |
5152 | if (IS_ERR(obj)) { |
5153 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); | |
e5009240 | 5154 | return PTR_ERR(obj); |
36dd1bcc | 5155 | } |
e5009240 | 5156 | |
d9adf22a | 5157 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
e5009240 PNA |
5158 | if (!skb2) |
5159 | return -ENOMEM; | |
5160 | ||
43da04a5 PNA |
5161 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) |
5162 | reset = true; | |
5163 | ||
e5009240 PNA |
5164 | err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, |
5165 | nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, | |
43da04a5 | 5166 | family, table, obj, reset); |
e5009240 PNA |
5167 | if (err < 0) |
5168 | goto err; | |
5169 | ||
5170 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5171 | err: | |
5172 | kfree_skb(skb2); | |
5173 | return err; | |
e5009240 PNA |
5174 | } |
5175 | ||
00bfb320 | 5176 | static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj) |
e5009240 | 5177 | { |
dfc46034 | 5178 | if (obj->ops->destroy) |
00bfb320 | 5179 | obj->ops->destroy(ctx, obj); |
e5009240 | 5180 | |
dfc46034 | 5181 | module_put(obj->ops->type->owner); |
61509575 | 5182 | kfree(obj->name); |
e5009240 PNA |
5183 | kfree(obj); |
5184 | } | |
5185 | ||
5186 | static int nf_tables_delobj(struct net *net, struct sock *nlsk, | |
04ba724b PNA |
5187 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
5188 | const struct nlattr * const nla[], | |
5189 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
5190 | { |
5191 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5192 | u8 genmask = nft_genmask_next(net); | |
5193 | int family = nfmsg->nfgen_family; | |
36dd1bcc | 5194 | const struct nlattr *attr; |
e5009240 PNA |
5195 | struct nft_table *table; |
5196 | struct nft_object *obj; | |
5197 | struct nft_ctx ctx; | |
5198 | u32 objtype; | |
5199 | ||
5200 | if (!nla[NFTA_OBJ_TYPE] || | |
3ecbfd65 | 5201 | (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE])) |
e5009240 PNA |
5202 | return -EINVAL; |
5203 | ||
cac20fcd | 5204 | table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask); |
36dd1bcc PNA |
5205 | if (IS_ERR(table)) { |
5206 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); | |
e5009240 | 5207 | return PTR_ERR(table); |
36dd1bcc | 5208 | } |
e5009240 PNA |
5209 | |
5210 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
36dd1bcc PNA |
5211 | if (nla[NFTA_OBJ_HANDLE]) { |
5212 | attr = nla[NFTA_OBJ_HANDLE]; | |
5213 | obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask); | |
5214 | } else { | |
5215 | attr = nla[NFTA_OBJ_NAME]; | |
5216 | obj = nft_obj_lookup(table, attr, objtype, genmask); | |
5217 | } | |
5218 | ||
5219 | if (IS_ERR(obj)) { | |
5220 | NL_SET_BAD_ATTR(extack, attr); | |
e5009240 | 5221 | return PTR_ERR(obj); |
36dd1bcc PNA |
5222 | } |
5223 | if (obj->use > 0) { | |
5224 | NL_SET_BAD_ATTR(extack, attr); | |
e5009240 | 5225 | return -EBUSY; |
36dd1bcc | 5226 | } |
e5009240 | 5227 | |
98319cb9 | 5228 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e5009240 PNA |
5229 | |
5230 | return nft_delobj(&ctx, obj); | |
5231 | } | |
5232 | ||
25e94a99 PNA |
5233 | void nft_obj_notify(struct net *net, struct nft_table *table, |
5234 | struct nft_object *obj, u32 portid, u32 seq, int event, | |
5235 | int family, int report, gfp_t gfp) | |
e5009240 PNA |
5236 | { |
5237 | struct sk_buff *skb; | |
5238 | int err; | |
5239 | ||
2599e989 PNA |
5240 | if (!report && |
5241 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 5242 | return; |
e5009240 | 5243 | |
2599e989 | 5244 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp); |
e5009240 PNA |
5245 | if (skb == NULL) |
5246 | goto err; | |
5247 | ||
2599e989 PNA |
5248 | err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family, |
5249 | table, obj, false); | |
e5009240 PNA |
5250 | if (err < 0) { |
5251 | kfree_skb(skb); | |
5252 | goto err; | |
5253 | } | |
5254 | ||
25e94a99 PNA |
5255 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp); |
5256 | return; | |
e5009240 | 5257 | err: |
25e94a99 | 5258 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
e5009240 | 5259 | } |
2599e989 PNA |
5260 | EXPORT_SYMBOL_GPL(nft_obj_notify); |
5261 | ||
25e94a99 PNA |
5262 | static void nf_tables_obj_notify(const struct nft_ctx *ctx, |
5263 | struct nft_object *obj, int event) | |
2599e989 | 5264 | { |
25e94a99 | 5265 | nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, |
36596dad | 5266 | ctx->family, ctx->report, GFP_KERNEL); |
2599e989 | 5267 | } |
e5009240 | 5268 | |
3b49e2e9 PNA |
5269 | /* |
5270 | * Flow tables | |
5271 | */ | |
5272 | void nft_register_flowtable_type(struct nf_flowtable_type *type) | |
5273 | { | |
5274 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
5275 | list_add_tail_rcu(&type->list, &nf_tables_flowtables); | |
5276 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
5277 | } | |
5278 | EXPORT_SYMBOL_GPL(nft_register_flowtable_type); | |
5279 | ||
5280 | void nft_unregister_flowtable_type(struct nf_flowtable_type *type) | |
5281 | { | |
5282 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
5283 | list_del_rcu(&type->list); | |
5284 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
5285 | } | |
5286 | EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type); | |
5287 | ||
5288 | static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = { | |
5289 | [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING, | |
5290 | .len = NFT_NAME_MAXLEN - 1 }, | |
5291 | [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING, | |
5292 | .len = NFT_NAME_MAXLEN - 1 }, | |
5293 | [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED }, | |
3ecbfd65 | 5294 | [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 }, |
3b49e2e9 PNA |
5295 | }; |
5296 | ||
cac20fcd PNA |
5297 | struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, |
5298 | const struct nlattr *nla, u8 genmask) | |
3b49e2e9 PNA |
5299 | { |
5300 | struct nft_flowtable *flowtable; | |
5301 | ||
d9adf22a | 5302 | list_for_each_entry_rcu(flowtable, &table->flowtables, list) { |
3b49e2e9 PNA |
5303 | if (!nla_strcmp(nla, flowtable->name) && |
5304 | nft_active_genmask(flowtable, genmask)) | |
5305 | return flowtable; | |
5306 | } | |
5307 | return ERR_PTR(-ENOENT); | |
5308 | } | |
cac20fcd | 5309 | EXPORT_SYMBOL_GPL(nft_flowtable_lookup); |
3b49e2e9 | 5310 | |
ae0662f8 | 5311 | static struct nft_flowtable * |
cac20fcd PNA |
5312 | nft_flowtable_lookup_byhandle(const struct nft_table *table, |
5313 | const struct nlattr *nla, u8 genmask) | |
3ecbfd65 HS |
5314 | { |
5315 | struct nft_flowtable *flowtable; | |
5316 | ||
5317 | list_for_each_entry(flowtable, &table->flowtables, list) { | |
5318 | if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle && | |
5319 | nft_active_genmask(flowtable, genmask)) | |
5320 | return flowtable; | |
5321 | } | |
5322 | return ERR_PTR(-ENOENT); | |
5323 | } | |
5324 | ||
3b49e2e9 PNA |
5325 | static int nf_tables_parse_devices(const struct nft_ctx *ctx, |
5326 | const struct nlattr *attr, | |
5327 | struct net_device *dev_array[], int *len) | |
5328 | { | |
5329 | const struct nlattr *tmp; | |
5330 | struct net_device *dev; | |
5331 | char ifname[IFNAMSIZ]; | |
5332 | int rem, n = 0, err; | |
5333 | ||
5334 | nla_for_each_nested(tmp, attr, rem) { | |
5335 | if (nla_type(tmp) != NFTA_DEVICE_NAME) { | |
5336 | err = -EINVAL; | |
5337 | goto err1; | |
5338 | } | |
5339 | ||
5340 | nla_strlcpy(ifname, tmp, IFNAMSIZ); | |
90d2723c | 5341 | dev = __dev_get_by_name(ctx->net, ifname); |
3b49e2e9 PNA |
5342 | if (!dev) { |
5343 | err = -ENOENT; | |
5344 | goto err1; | |
5345 | } | |
5346 | ||
5347 | dev_array[n++] = dev; | |
5348 | if (n == NFT_FLOWTABLE_DEVICE_MAX) { | |
5349 | err = -EFBIG; | |
5350 | goto err1; | |
5351 | } | |
5352 | } | |
5353 | if (!len) | |
5354 | return -EINVAL; | |
5355 | ||
5356 | err = 0; | |
5357 | err1: | |
5358 | *len = n; | |
5359 | return err; | |
5360 | } | |
5361 | ||
5362 | static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = { | |
5363 | [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 }, | |
5364 | [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
5365 | [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED }, | |
5366 | }; | |
5367 | ||
5368 | static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx, | |
5369 | const struct nlattr *attr, | |
5370 | struct nft_flowtable *flowtable) | |
5371 | { | |
5372 | struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX]; | |
5373 | struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1]; | |
5374 | struct nf_hook_ops *ops; | |
5375 | int hooknum, priority; | |
5376 | int err, n = 0, i; | |
5377 | ||
5378 | err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr, | |
5379 | nft_flowtable_hook_policy, NULL); | |
5380 | if (err < 0) | |
5381 | return err; | |
5382 | ||
5383 | if (!tb[NFTA_FLOWTABLE_HOOK_NUM] || | |
5384 | !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] || | |
5385 | !tb[NFTA_FLOWTABLE_HOOK_DEVS]) | |
5386 | return -EINVAL; | |
5387 | ||
5388 | hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); | |
fe19c04c | 5389 | if (hooknum != NF_NETDEV_INGRESS) |
3b49e2e9 PNA |
5390 | return -EINVAL; |
5391 | ||
5392 | priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); | |
5393 | ||
5394 | err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS], | |
5395 | dev_array, &n); | |
5396 | if (err < 0) | |
d92191aa | 5397 | return err; |
3b49e2e9 | 5398 | |
6396bb22 | 5399 | ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL); |
90d2723c PNA |
5400 | if (!ops) |
5401 | return -ENOMEM; | |
3b49e2e9 | 5402 | |
0e839dfa PNA |
5403 | flowtable->hooknum = hooknum; |
5404 | flowtable->priority = priority; | |
3b49e2e9 PNA |
5405 | flowtable->ops = ops; |
5406 | flowtable->ops_len = n; | |
5407 | ||
5408 | for (i = 0; i < n; i++) { | |
5409 | flowtable->ops[i].pf = NFPROTO_NETDEV; | |
5410 | flowtable->ops[i].hooknum = hooknum; | |
5411 | flowtable->ops[i].priority = priority; | |
17857d92 | 5412 | flowtable->ops[i].priv = &flowtable->data; |
3b49e2e9 PNA |
5413 | flowtable->ops[i].hook = flowtable->data.type->hook; |
5414 | flowtable->ops[i].dev = dev_array[i]; | |
5415 | } | |
5416 | ||
3b49e2e9 PNA |
5417 | return err; |
5418 | } | |
5419 | ||
98319cb9 | 5420 | static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family) |
3b49e2e9 PNA |
5421 | { |
5422 | const struct nf_flowtable_type *type; | |
5423 | ||
5424 | list_for_each_entry(type, &nf_tables_flowtables, list) { | |
98319cb9 | 5425 | if (family == type->family) |
3b49e2e9 PNA |
5426 | return type; |
5427 | } | |
5428 | return NULL; | |
5429 | } | |
5430 | ||
452238e8 FW |
5431 | static const struct nf_flowtable_type * |
5432 | nft_flowtable_type_get(struct net *net, u8 family) | |
3b49e2e9 PNA |
5433 | { |
5434 | const struct nf_flowtable_type *type; | |
5435 | ||
98319cb9 | 5436 | type = __nft_flowtable_type_get(family); |
3b49e2e9 PNA |
5437 | if (type != NULL && try_module_get(type->owner)) |
5438 | return type; | |
5439 | ||
f102d66b | 5440 | lockdep_nfnl_nft_mutex_not_held(); |
3b49e2e9 PNA |
5441 | #ifdef CONFIG_MODULES |
5442 | if (type == NULL) { | |
452238e8 | 5443 | nft_request_module(net, "nf-flowtable-%u", family); |
98319cb9 | 5444 | if (__nft_flowtable_type_get(family)) |
3b49e2e9 PNA |
5445 | return ERR_PTR(-EAGAIN); |
5446 | } | |
5447 | #endif | |
5448 | return ERR_PTR(-ENOENT); | |
5449 | } | |
5450 | ||
3b49e2e9 PNA |
5451 | static void nft_unregister_flowtable_net_hooks(struct net *net, |
5452 | struct nft_flowtable *flowtable) | |
5453 | { | |
5454 | int i; | |
5455 | ||
5456 | for (i = 0; i < flowtable->ops_len; i++) { | |
5457 | if (!flowtable->ops[i].dev) | |
5458 | continue; | |
5459 | ||
5460 | nf_unregister_net_hook(net, &flowtable->ops[i]); | |
5461 | } | |
5462 | } | |
5463 | ||
5464 | static int nf_tables_newflowtable(struct net *net, struct sock *nlsk, | |
5465 | struct sk_buff *skb, | |
5466 | const struct nlmsghdr *nlh, | |
5467 | const struct nlattr * const nla[], | |
5468 | struct netlink_ext_ack *extack) | |
5469 | { | |
5470 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5471 | const struct nf_flowtable_type *type; | |
32fc7187 | 5472 | struct nft_flowtable *flowtable, *ft; |
3b49e2e9 PNA |
5473 | u8 genmask = nft_genmask_next(net); |
5474 | int family = nfmsg->nfgen_family; | |
3b49e2e9 PNA |
5475 | struct nft_table *table; |
5476 | struct nft_ctx ctx; | |
5477 | int err, i, k; | |
5478 | ||
5479 | if (!nla[NFTA_FLOWTABLE_TABLE] || | |
5480 | !nla[NFTA_FLOWTABLE_NAME] || | |
5481 | !nla[NFTA_FLOWTABLE_HOOK]) | |
5482 | return -EINVAL; | |
5483 | ||
cac20fcd PNA |
5484 | table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, |
5485 | genmask); | |
36dd1bcc PNA |
5486 | if (IS_ERR(table)) { |
5487 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); | |
3b49e2e9 | 5488 | return PTR_ERR(table); |
36dd1bcc | 5489 | } |
3b49e2e9 | 5490 | |
cac20fcd PNA |
5491 | flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], |
5492 | genmask); | |
3b49e2e9 PNA |
5493 | if (IS_ERR(flowtable)) { |
5494 | err = PTR_ERR(flowtable); | |
36dd1bcc PNA |
5495 | if (err != -ENOENT) { |
5496 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); | |
3b49e2e9 | 5497 | return err; |
36dd1bcc | 5498 | } |
3b49e2e9 | 5499 | } else { |
36dd1bcc PNA |
5500 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
5501 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); | |
3b49e2e9 | 5502 | return -EEXIST; |
36dd1bcc | 5503 | } |
3b49e2e9 PNA |
5504 | |
5505 | return 0; | |
5506 | } | |
5507 | ||
98319cb9 | 5508 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
3b49e2e9 PNA |
5509 | |
5510 | flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL); | |
5511 | if (!flowtable) | |
5512 | return -ENOMEM; | |
5513 | ||
5514 | flowtable->table = table; | |
3ecbfd65 HS |
5515 | flowtable->handle = nf_tables_alloc_handle(table); |
5516 | ||
3b49e2e9 PNA |
5517 | flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL); |
5518 | if (!flowtable->name) { | |
5519 | err = -ENOMEM; | |
5520 | goto err1; | |
5521 | } | |
5522 | ||
452238e8 | 5523 | type = nft_flowtable_type_get(net, family); |
3b49e2e9 PNA |
5524 | if (IS_ERR(type)) { |
5525 | err = PTR_ERR(type); | |
5526 | goto err2; | |
5527 | } | |
5528 | ||
5529 | flowtable->data.type = type; | |
a268de77 | 5530 | err = type->init(&flowtable->data); |
3b49e2e9 PNA |
5531 | if (err < 0) |
5532 | goto err3; | |
5533 | ||
5534 | err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK], | |
5535 | flowtable); | |
5536 | if (err < 0) | |
a268de77 | 5537 | goto err4; |
3b49e2e9 PNA |
5538 | |
5539 | for (i = 0; i < flowtable->ops_len; i++) { | |
32fc7187 PNA |
5540 | if (!flowtable->ops[i].dev) |
5541 | continue; | |
5542 | ||
5543 | list_for_each_entry(ft, &table->flowtables, list) { | |
5544 | for (k = 0; k < ft->ops_len; k++) { | |
5545 | if (!ft->ops[k].dev) | |
5546 | continue; | |
5547 | ||
5548 | if (flowtable->ops[i].dev == ft->ops[k].dev && | |
5549 | flowtable->ops[i].pf == ft->ops[k].pf) { | |
5550 | err = -EBUSY; | |
a268de77 | 5551 | goto err5; |
32fc7187 PNA |
5552 | } |
5553 | } | |
5554 | } | |
5555 | ||
3b49e2e9 PNA |
5556 | err = nf_register_net_hook(net, &flowtable->ops[i]); |
5557 | if (err < 0) | |
a268de77 | 5558 | goto err5; |
3b49e2e9 PNA |
5559 | } |
5560 | ||
5561 | err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable); | |
5562 | if (err < 0) | |
a268de77 | 5563 | goto err6; |
3b49e2e9 PNA |
5564 | |
5565 | list_add_tail_rcu(&flowtable->list, &table->flowtables); | |
5566 | table->use++; | |
5567 | ||
5568 | return 0; | |
a268de77 | 5569 | err6: |
3b49e2e9 | 5570 | i = flowtable->ops_len; |
a268de77 | 5571 | err5: |
b8088dda | 5572 | for (k = i - 1; k >= 0; k--) |
0e0d5002 | 5573 | nf_unregister_net_hook(net, &flowtable->ops[k]); |
3b49e2e9 PNA |
5574 | |
5575 | kfree(flowtable->ops); | |
a268de77 FF |
5576 | err4: |
5577 | flowtable->data.type->free(&flowtable->data); | |
3b49e2e9 PNA |
5578 | err3: |
5579 | module_put(type->owner); | |
5580 | err2: | |
5581 | kfree(flowtable->name); | |
5582 | err1: | |
5583 | kfree(flowtable); | |
5584 | return err; | |
5585 | } | |
5586 | ||
5587 | static int nf_tables_delflowtable(struct net *net, struct sock *nlsk, | |
5588 | struct sk_buff *skb, | |
5589 | const struct nlmsghdr *nlh, | |
5590 | const struct nlattr * const nla[], | |
5591 | struct netlink_ext_ack *extack) | |
5592 | { | |
5593 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5594 | u8 genmask = nft_genmask_next(net); | |
5595 | int family = nfmsg->nfgen_family; | |
5596 | struct nft_flowtable *flowtable; | |
36dd1bcc | 5597 | const struct nlattr *attr; |
3b49e2e9 PNA |
5598 | struct nft_table *table; |
5599 | struct nft_ctx ctx; | |
5600 | ||
e603ea4b PNA |
5601 | if (!nla[NFTA_FLOWTABLE_TABLE] || |
5602 | (!nla[NFTA_FLOWTABLE_NAME] && | |
5603 | !nla[NFTA_FLOWTABLE_HANDLE])) | |
5604 | return -EINVAL; | |
5605 | ||
cac20fcd PNA |
5606 | table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, |
5607 | genmask); | |
36dd1bcc PNA |
5608 | if (IS_ERR(table)) { |
5609 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); | |
3b49e2e9 | 5610 | return PTR_ERR(table); |
36dd1bcc | 5611 | } |
3b49e2e9 | 5612 | |
36dd1bcc PNA |
5613 | if (nla[NFTA_FLOWTABLE_HANDLE]) { |
5614 | attr = nla[NFTA_FLOWTABLE_HANDLE]; | |
5615 | flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask); | |
5616 | } else { | |
5617 | attr = nla[NFTA_FLOWTABLE_NAME]; | |
5618 | flowtable = nft_flowtable_lookup(table, attr, genmask); | |
5619 | } | |
5620 | ||
5621 | if (IS_ERR(flowtable)) { | |
5622 | NL_SET_BAD_ATTR(extack, attr); | |
5623 | return PTR_ERR(flowtable); | |
5624 | } | |
5625 | if (flowtable->use > 0) { | |
5626 | NL_SET_BAD_ATTR(extack, attr); | |
3b49e2e9 | 5627 | return -EBUSY; |
36dd1bcc | 5628 | } |
3b49e2e9 | 5629 | |
98319cb9 | 5630 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
3b49e2e9 PNA |
5631 | |
5632 | return nft_delflowtable(&ctx, flowtable); | |
5633 | } | |
5634 | ||
5635 | static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net, | |
5636 | u32 portid, u32 seq, int event, | |
5637 | u32 flags, int family, | |
5638 | struct nft_flowtable *flowtable) | |
5639 | { | |
5640 | struct nlattr *nest, *nest_devs; | |
5641 | struct nfgenmsg *nfmsg; | |
5642 | struct nlmsghdr *nlh; | |
5643 | int i; | |
5644 | ||
5645 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); | |
5646 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
5647 | if (nlh == NULL) | |
5648 | goto nla_put_failure; | |
5649 | ||
5650 | nfmsg = nlmsg_data(nlh); | |
5651 | nfmsg->nfgen_family = family; | |
5652 | nfmsg->version = NFNETLINK_V0; | |
5653 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
5654 | ||
5655 | if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) || | |
5656 | nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) || | |
3ecbfd65 HS |
5657 | nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) || |
5658 | nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle), | |
5659 | NFTA_FLOWTABLE_PAD)) | |
3b49e2e9 PNA |
5660 | goto nla_put_failure; |
5661 | ||
5662 | nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK); | |
5663 | if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) || | |
5664 | nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority))) | |
5665 | goto nla_put_failure; | |
5666 | ||
5667 | nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS); | |
5668 | if (!nest_devs) | |
5669 | goto nla_put_failure; | |
5670 | ||
5671 | for (i = 0; i < flowtable->ops_len; i++) { | |
b8088dda FW |
5672 | const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev); |
5673 | ||
5674 | if (dev && | |
5675 | nla_put_string(skb, NFTA_DEVICE_NAME, dev->name)) | |
3b49e2e9 PNA |
5676 | goto nla_put_failure; |
5677 | } | |
5678 | nla_nest_end(skb, nest_devs); | |
5679 | nla_nest_end(skb, nest); | |
5680 | ||
5681 | nlmsg_end(skb, nlh); | |
5682 | return 0; | |
5683 | ||
5684 | nla_put_failure: | |
5685 | nlmsg_trim(skb, nlh); | |
5686 | return -1; | |
5687 | } | |
5688 | ||
5689 | struct nft_flowtable_filter { | |
5690 | char *table; | |
5691 | }; | |
5692 | ||
5693 | static int nf_tables_dump_flowtable(struct sk_buff *skb, | |
5694 | struct netlink_callback *cb) | |
5695 | { | |
5696 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
5697 | struct nft_flowtable_filter *filter = cb->data; | |
5698 | unsigned int idx = 0, s_idx = cb->args[0]; | |
5699 | struct net *net = sock_net(skb->sk); | |
5700 | int family = nfmsg->nfgen_family; | |
5701 | struct nft_flowtable *flowtable; | |
3b49e2e9 PNA |
5702 | const struct nft_table *table; |
5703 | ||
5704 | rcu_read_lock(); | |
5705 | cb->seq = net->nft.base_seq; | |
5706 | ||
36596dad | 5707 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 5708 | if (family != NFPROTO_UNSPEC && family != table->family) |
3b49e2e9 PNA |
5709 | continue; |
5710 | ||
36596dad PNA |
5711 | list_for_each_entry_rcu(flowtable, &table->flowtables, list) { |
5712 | if (!nft_is_active(net, flowtable)) | |
5713 | goto cont; | |
5714 | if (idx < s_idx) | |
5715 | goto cont; | |
5716 | if (idx > s_idx) | |
5717 | memset(&cb->args[1], 0, | |
5718 | sizeof(cb->args) - sizeof(cb->args[0])); | |
360cc79d | 5719 | if (filter && filter->table && |
36596dad PNA |
5720 | strcmp(filter->table, table->name)) |
5721 | goto cont; | |
3b49e2e9 | 5722 | |
36596dad PNA |
5723 | if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid, |
5724 | cb->nlh->nlmsg_seq, | |
5725 | NFT_MSG_NEWFLOWTABLE, | |
5726 | NLM_F_MULTI | NLM_F_APPEND, | |
98319cb9 | 5727 | table->family, flowtable) < 0) |
36596dad | 5728 | goto done; |
3b49e2e9 | 5729 | |
36596dad | 5730 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
3b49e2e9 | 5731 | cont: |
36596dad | 5732 | idx++; |
3b49e2e9 PNA |
5733 | } |
5734 | } | |
5735 | done: | |
5736 | rcu_read_unlock(); | |
5737 | ||
5738 | cb->args[0] = idx; | |
5739 | return skb->len; | |
5740 | } | |
5741 | ||
90fd131a | 5742 | static int nf_tables_dump_flowtable_start(struct netlink_callback *cb) |
3b49e2e9 | 5743 | { |
90fd131a FW |
5744 | const struct nlattr * const *nla = cb->data; |
5745 | struct nft_flowtable_filter *filter = NULL; | |
3b49e2e9 | 5746 | |
90fd131a FW |
5747 | if (nla[NFTA_FLOWTABLE_TABLE]) { |
5748 | filter = kzalloc(sizeof(*filter), GFP_ATOMIC); | |
5749 | if (!filter) | |
5750 | return -ENOMEM; | |
3b49e2e9 | 5751 | |
90fd131a FW |
5752 | filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE], |
5753 | GFP_ATOMIC); | |
5754 | if (!filter->table) { | |
5755 | kfree(filter); | |
5756 | return -ENOMEM; | |
5757 | } | |
5758 | } | |
3b49e2e9 | 5759 | |
90fd131a | 5760 | cb->data = filter; |
3b49e2e9 PNA |
5761 | return 0; |
5762 | } | |
5763 | ||
90fd131a | 5764 | static int nf_tables_dump_flowtable_done(struct netlink_callback *cb) |
3b49e2e9 | 5765 | { |
90fd131a | 5766 | struct nft_flowtable_filter *filter = cb->data; |
3b49e2e9 | 5767 | |
3b49e2e9 | 5768 | if (!filter) |
90fd131a | 5769 | return 0; |
3b49e2e9 | 5770 | |
90fd131a FW |
5771 | kfree(filter->table); |
5772 | kfree(filter); | |
5773 | ||
5774 | return 0; | |
3b49e2e9 PNA |
5775 | } |
5776 | ||
d9adf22a | 5777 | /* called with rcu_read_lock held */ |
3b49e2e9 PNA |
5778 | static int nf_tables_getflowtable(struct net *net, struct sock *nlsk, |
5779 | struct sk_buff *skb, | |
5780 | const struct nlmsghdr *nlh, | |
5781 | const struct nlattr * const nla[], | |
5782 | struct netlink_ext_ack *extack) | |
5783 | { | |
5784 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5785 | u8 genmask = nft_genmask_cur(net); | |
5786 | int family = nfmsg->nfgen_family; | |
5787 | struct nft_flowtable *flowtable; | |
3b49e2e9 PNA |
5788 | const struct nft_table *table; |
5789 | struct sk_buff *skb2; | |
5790 | int err; | |
5791 | ||
5792 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
5793 | struct netlink_dump_control c = { | |
90fd131a | 5794 | .start = nf_tables_dump_flowtable_start, |
3b49e2e9 PNA |
5795 | .dump = nf_tables_dump_flowtable, |
5796 | .done = nf_tables_dump_flowtable_done, | |
d9adf22a | 5797 | .module = THIS_MODULE, |
90fd131a | 5798 | .data = (void *)nla, |
3b49e2e9 PNA |
5799 | }; |
5800 | ||
d9adf22a | 5801 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
3b49e2e9 PNA |
5802 | } |
5803 | ||
5804 | if (!nla[NFTA_FLOWTABLE_NAME]) | |
5805 | return -EINVAL; | |
5806 | ||
cac20fcd PNA |
5807 | table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, |
5808 | genmask); | |
3b49e2e9 PNA |
5809 | if (IS_ERR(table)) |
5810 | return PTR_ERR(table); | |
5811 | ||
cac20fcd PNA |
5812 | flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], |
5813 | genmask); | |
03a0120f | 5814 | if (IS_ERR(flowtable)) |
3b49e2e9 PNA |
5815 | return PTR_ERR(flowtable); |
5816 | ||
d9adf22a | 5817 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
3b49e2e9 PNA |
5818 | if (!skb2) |
5819 | return -ENOMEM; | |
5820 | ||
5821 | err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid, | |
5822 | nlh->nlmsg_seq, | |
5823 | NFT_MSG_NEWFLOWTABLE, 0, family, | |
5824 | flowtable); | |
5825 | if (err < 0) | |
5826 | goto err; | |
5827 | ||
5828 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5829 | err: | |
5830 | kfree_skb(skb2); | |
5831 | return err; | |
5832 | } | |
5833 | ||
5834 | static void nf_tables_flowtable_notify(struct nft_ctx *ctx, | |
5835 | struct nft_flowtable *flowtable, | |
5836 | int event) | |
5837 | { | |
5838 | struct sk_buff *skb; | |
5839 | int err; | |
5840 | ||
5841 | if (ctx->report && | |
5842 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
5843 | return; | |
5844 | ||
5845 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
5846 | if (skb == NULL) | |
5847 | goto err; | |
5848 | ||
5849 | err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid, | |
5850 | ctx->seq, event, 0, | |
36596dad | 5851 | ctx->family, flowtable); |
3b49e2e9 PNA |
5852 | if (err < 0) { |
5853 | kfree_skb(skb); | |
5854 | goto err; | |
5855 | } | |
5856 | ||
5857 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
5858 | ctx->report, GFP_KERNEL); | |
5859 | return; | |
5860 | err: | |
5861 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); | |
5862 | } | |
5863 | ||
3b49e2e9 PNA |
5864 | static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable) |
5865 | { | |
c04a3f73 | 5866 | kfree(flowtable->ops); |
3b49e2e9 | 5867 | kfree(flowtable->name); |
b408c5b0 | 5868 | flowtable->data.type->free(&flowtable->data); |
3b49e2e9 | 5869 | module_put(flowtable->data.type->owner); |
a12486eb | 5870 | kfree(flowtable); |
3b49e2e9 PNA |
5871 | } |
5872 | ||
84d7fce6 PNA |
5873 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
5874 | u32 portid, u32 seq) | |
5875 | { | |
5876 | struct nlmsghdr *nlh; | |
5877 | struct nfgenmsg *nfmsg; | |
784b4e61 | 5878 | char buf[TASK_COMM_LEN]; |
dedb67c4 | 5879 | int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); |
84d7fce6 PNA |
5880 | |
5881 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
5882 | if (nlh == NULL) | |
5883 | goto nla_put_failure; | |
5884 | ||
5885 | nfmsg = nlmsg_data(nlh); | |
5886 | nfmsg->nfgen_family = AF_UNSPEC; | |
5887 | nfmsg->version = NFNETLINK_V0; | |
5888 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
5889 | ||
784b4e61 PS |
5890 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) || |
5891 | nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) || | |
5892 | nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current))) | |
84d7fce6 PNA |
5893 | goto nla_put_failure; |
5894 | ||
053c095a JB |
5895 | nlmsg_end(skb, nlh); |
5896 | return 0; | |
84d7fce6 PNA |
5897 | |
5898 | nla_put_failure: | |
5899 | nlmsg_trim(skb, nlh); | |
5900 | return -EMSGSIZE; | |
5901 | } | |
5902 | ||
3b49e2e9 PNA |
5903 | static void nft_flowtable_event(unsigned long event, struct net_device *dev, |
5904 | struct nft_flowtable *flowtable) | |
5905 | { | |
5906 | int i; | |
5907 | ||
5908 | for (i = 0; i < flowtable->ops_len; i++) { | |
5909 | if (flowtable->ops[i].dev != dev) | |
5910 | continue; | |
5911 | ||
5912 | nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]); | |
5913 | flowtable->ops[i].dev = NULL; | |
5914 | break; | |
5915 | } | |
5916 | } | |
5917 | ||
5918 | static int nf_tables_flowtable_event(struct notifier_block *this, | |
5919 | unsigned long event, void *ptr) | |
5920 | { | |
5921 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
5922 | struct nft_flowtable *flowtable; | |
5923 | struct nft_table *table; | |
0a2cf5ee | 5924 | struct net *net; |
3b49e2e9 PNA |
5925 | |
5926 | if (event != NETDEV_UNREGISTER) | |
5927 | return 0; | |
5928 | ||
6a48de01 | 5929 | net = dev_net(dev); |
9e619d87 | 5930 | mutex_lock(&net->nft.commit_mutex); |
0a2cf5ee | 5931 | list_for_each_entry(table, &net->nft.tables, list) { |
36596dad PNA |
5932 | list_for_each_entry(flowtable, &table->flowtables, list) { |
5933 | nft_flowtable_event(event, dev, flowtable); | |
3b49e2e9 PNA |
5934 | } |
5935 | } | |
9e619d87 | 5936 | mutex_unlock(&net->nft.commit_mutex); |
6a48de01 | 5937 | |
3b49e2e9 PNA |
5938 | return NOTIFY_DONE; |
5939 | } | |
5940 | ||
5941 | static struct notifier_block nf_tables_flowtable_notifier = { | |
5942 | .notifier_call = nf_tables_flowtable_event, | |
5943 | }; | |
5944 | ||
25e94a99 PNA |
5945 | static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, |
5946 | int event) | |
84d7fce6 PNA |
5947 | { |
5948 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
5949 | struct sk_buff *skb2; | |
5950 | int err; | |
5951 | ||
5952 | if (nlmsg_report(nlh) && | |
5953 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 5954 | return; |
84d7fce6 | 5955 | |
84d7fce6 PNA |
5956 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
5957 | if (skb2 == NULL) | |
5958 | goto err; | |
5959 | ||
5960 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
5961 | nlh->nlmsg_seq); | |
5962 | if (err < 0) { | |
5963 | kfree_skb(skb2); | |
5964 | goto err; | |
5965 | } | |
5966 | ||
25e94a99 PNA |
5967 | nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
5968 | nlmsg_report(nlh), GFP_KERNEL); | |
5969 | return; | |
84d7fce6 | 5970 | err: |
25e94a99 PNA |
5971 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
5972 | -ENOBUFS); | |
84d7fce6 PNA |
5973 | } |
5974 | ||
7b8002a1 PNA |
5975 | static int nf_tables_getgen(struct net *net, struct sock *nlsk, |
5976 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
5977 | const struct nlattr * const nla[], |
5978 | struct netlink_ext_ack *extack) | |
84d7fce6 | 5979 | { |
84d7fce6 PNA |
5980 | struct sk_buff *skb2; |
5981 | int err; | |
5982 | ||
d9adf22a | 5983 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
84d7fce6 PNA |
5984 | if (skb2 == NULL) |
5985 | return -ENOMEM; | |
5986 | ||
5987 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
5988 | nlh->nlmsg_seq); | |
5989 | if (err < 0) | |
5990 | goto err; | |
5991 | ||
5992 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5993 | err: | |
5994 | kfree_skb(skb2); | |
5995 | return err; | |
5996 | } | |
5997 | ||
96518518 PM |
5998 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
5999 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 6000 | .call_batch = nf_tables_newtable, |
96518518 PM |
6001 | .attr_count = NFTA_TABLE_MAX, |
6002 | .policy = nft_table_policy, | |
6003 | }, | |
6004 | [NFT_MSG_GETTABLE] = { | |
d9adf22a | 6005 | .call_rcu = nf_tables_gettable, |
96518518 PM |
6006 | .attr_count = NFTA_TABLE_MAX, |
6007 | .policy = nft_table_policy, | |
6008 | }, | |
6009 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 6010 | .call_batch = nf_tables_deltable, |
96518518 PM |
6011 | .attr_count = NFTA_TABLE_MAX, |
6012 | .policy = nft_table_policy, | |
6013 | }, | |
6014 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 6015 | .call_batch = nf_tables_newchain, |
96518518 PM |
6016 | .attr_count = NFTA_CHAIN_MAX, |
6017 | .policy = nft_chain_policy, | |
6018 | }, | |
6019 | [NFT_MSG_GETCHAIN] = { | |
d9adf22a | 6020 | .call_rcu = nf_tables_getchain, |
96518518 PM |
6021 | .attr_count = NFTA_CHAIN_MAX, |
6022 | .policy = nft_chain_policy, | |
6023 | }, | |
6024 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 6025 | .call_batch = nf_tables_delchain, |
96518518 PM |
6026 | .attr_count = NFTA_CHAIN_MAX, |
6027 | .policy = nft_chain_policy, | |
6028 | }, | |
6029 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 6030 | .call_batch = nf_tables_newrule, |
96518518 PM |
6031 | .attr_count = NFTA_RULE_MAX, |
6032 | .policy = nft_rule_policy, | |
6033 | }, | |
6034 | [NFT_MSG_GETRULE] = { | |
d9adf22a | 6035 | .call_rcu = nf_tables_getrule, |
96518518 PM |
6036 | .attr_count = NFTA_RULE_MAX, |
6037 | .policy = nft_rule_policy, | |
6038 | }, | |
6039 | [NFT_MSG_DELRULE] = { | |
0628b123 | 6040 | .call_batch = nf_tables_delrule, |
96518518 PM |
6041 | .attr_count = NFTA_RULE_MAX, |
6042 | .policy = nft_rule_policy, | |
6043 | }, | |
20a69341 | 6044 | [NFT_MSG_NEWSET] = { |
958bee14 | 6045 | .call_batch = nf_tables_newset, |
20a69341 PM |
6046 | .attr_count = NFTA_SET_MAX, |
6047 | .policy = nft_set_policy, | |
6048 | }, | |
6049 | [NFT_MSG_GETSET] = { | |
d9adf22a | 6050 | .call_rcu = nf_tables_getset, |
20a69341 PM |
6051 | .attr_count = NFTA_SET_MAX, |
6052 | .policy = nft_set_policy, | |
6053 | }, | |
6054 | [NFT_MSG_DELSET] = { | |
958bee14 | 6055 | .call_batch = nf_tables_delset, |
20a69341 PM |
6056 | .attr_count = NFTA_SET_MAX, |
6057 | .policy = nft_set_policy, | |
6058 | }, | |
6059 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 6060 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
6061 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
6062 | .policy = nft_set_elem_list_policy, | |
6063 | }, | |
6064 | [NFT_MSG_GETSETELEM] = { | |
d9adf22a | 6065 | .call_rcu = nf_tables_getsetelem, |
20a69341 PM |
6066 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
6067 | .policy = nft_set_elem_list_policy, | |
6068 | }, | |
6069 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 6070 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
6071 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
6072 | .policy = nft_set_elem_list_policy, | |
6073 | }, | |
84d7fce6 | 6074 | [NFT_MSG_GETGEN] = { |
d9adf22a | 6075 | .call_rcu = nf_tables_getgen, |
84d7fce6 | 6076 | }, |
e5009240 PNA |
6077 | [NFT_MSG_NEWOBJ] = { |
6078 | .call_batch = nf_tables_newobj, | |
6079 | .attr_count = NFTA_OBJ_MAX, | |
6080 | .policy = nft_obj_policy, | |
6081 | }, | |
6082 | [NFT_MSG_GETOBJ] = { | |
d9adf22a | 6083 | .call_rcu = nf_tables_getobj, |
e5009240 PNA |
6084 | .attr_count = NFTA_OBJ_MAX, |
6085 | .policy = nft_obj_policy, | |
6086 | }, | |
6087 | [NFT_MSG_DELOBJ] = { | |
6088 | .call_batch = nf_tables_delobj, | |
6089 | .attr_count = NFTA_OBJ_MAX, | |
6090 | .policy = nft_obj_policy, | |
6091 | }, | |
43da04a5 | 6092 | [NFT_MSG_GETOBJ_RESET] = { |
d9adf22a | 6093 | .call_rcu = nf_tables_getobj, |
43da04a5 PNA |
6094 | .attr_count = NFTA_OBJ_MAX, |
6095 | .policy = nft_obj_policy, | |
6096 | }, | |
3b49e2e9 PNA |
6097 | [NFT_MSG_NEWFLOWTABLE] = { |
6098 | .call_batch = nf_tables_newflowtable, | |
6099 | .attr_count = NFTA_FLOWTABLE_MAX, | |
6100 | .policy = nft_flowtable_policy, | |
6101 | }, | |
6102 | [NFT_MSG_GETFLOWTABLE] = { | |
d9adf22a | 6103 | .call_rcu = nf_tables_getflowtable, |
3b49e2e9 PNA |
6104 | .attr_count = NFTA_FLOWTABLE_MAX, |
6105 | .policy = nft_flowtable_policy, | |
6106 | }, | |
6107 | [NFT_MSG_DELFLOWTABLE] = { | |
6108 | .call_batch = nf_tables_delflowtable, | |
6109 | .attr_count = NFTA_FLOWTABLE_MAX, | |
6110 | .policy = nft_flowtable_policy, | |
6111 | }, | |
96518518 PM |
6112 | }; |
6113 | ||
a654de8f PNA |
6114 | static int nf_tables_validate(struct net *net) |
6115 | { | |
6116 | struct nft_table *table; | |
6117 | ||
6118 | switch (net->nft.validate_state) { | |
6119 | case NFT_VALIDATE_SKIP: | |
6120 | break; | |
6121 | case NFT_VALIDATE_NEED: | |
6122 | nft_validate_state_update(net, NFT_VALIDATE_DO); | |
6123 | /* fall through */ | |
6124 | case NFT_VALIDATE_DO: | |
6125 | list_for_each_entry(table, &net->nft.tables, list) { | |
6126 | if (nft_table_validate(net, table) < 0) | |
6127 | return -EAGAIN; | |
6128 | } | |
6129 | break; | |
6130 | } | |
6131 | ||
6132 | return 0; | |
6133 | } | |
6134 | ||
91c7b38d PNA |
6135 | static void nft_chain_commit_update(struct nft_trans *trans) |
6136 | { | |
6137 | struct nft_base_chain *basechain; | |
6138 | ||
1b2470e5 FW |
6139 | if (nft_trans_chain_name(trans)) { |
6140 | rhltable_remove(&trans->ctx.table->chains_ht, | |
6141 | &trans->ctx.chain->rhlhead, | |
6142 | nft_chain_ht_params); | |
d71efb59 | 6143 | swap(trans->ctx.chain->name, nft_trans_chain_name(trans)); |
1b2470e5 FW |
6144 | rhltable_insert_key(&trans->ctx.table->chains_ht, |
6145 | trans->ctx.chain->name, | |
6146 | &trans->ctx.chain->rhlhead, | |
6147 | nft_chain_ht_params); | |
6148 | } | |
91c7b38d | 6149 | |
f323d954 | 6150 | if (!nft_is_base_chain(trans->ctx.chain)) |
91c7b38d PNA |
6151 | return; |
6152 | ||
6153 | basechain = nft_base_chain(trans->ctx.chain); | |
6154 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
6155 | ||
6156 | switch (nft_trans_chain_policy(trans)) { | |
6157 | case NF_DROP: | |
6158 | case NF_ACCEPT: | |
6159 | basechain->policy = nft_trans_chain_policy(trans); | |
6160 | break; | |
6161 | } | |
6162 | } | |
6163 | ||
2f99aa31 | 6164 | static void nft_commit_release(struct nft_trans *trans) |
c7c32e72 | 6165 | { |
c7c32e72 PNA |
6166 | switch (trans->msg_type) { |
6167 | case NFT_MSG_DELTABLE: | |
6168 | nf_tables_table_destroy(&trans->ctx); | |
6169 | break; | |
9f8aac0b FW |
6170 | case NFT_MSG_NEWCHAIN: |
6171 | kfree(nft_trans_chain_name(trans)); | |
6172 | break; | |
c7c32e72 | 6173 | case NFT_MSG_DELCHAIN: |
43a605f2 | 6174 | nf_tables_chain_destroy(&trans->ctx); |
c7c32e72 PNA |
6175 | break; |
6176 | case NFT_MSG_DELRULE: | |
6177 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
6178 | break; | |
6179 | case NFT_MSG_DELSET: | |
6180 | nft_set_destroy(nft_trans_set(trans)); | |
6181 | break; | |
61edafbb | 6182 | case NFT_MSG_DELSETELEM: |
3453c927 PNA |
6183 | nf_tables_set_elem_destroy(&trans->ctx, |
6184 | nft_trans_elem_set(trans), | |
59105446 | 6185 | nft_trans_elem(trans).priv); |
61edafbb | 6186 | break; |
e5009240 | 6187 | case NFT_MSG_DELOBJ: |
00bfb320 | 6188 | nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); |
e5009240 | 6189 | break; |
3b49e2e9 PNA |
6190 | case NFT_MSG_DELFLOWTABLE: |
6191 | nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); | |
6192 | break; | |
c7c32e72 PNA |
6193 | } |
6194 | kfree(trans); | |
6195 | } | |
6196 | ||
2f99aa31 FW |
6197 | static void nf_tables_commit_release(struct net *net) |
6198 | { | |
6199 | struct nft_trans *trans, *next; | |
6200 | ||
6201 | if (list_empty(&net->nft.commit_list)) | |
6202 | return; | |
6203 | ||
6204 | synchronize_rcu(); | |
6205 | ||
6206 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
6207 | list_del(&trans->list); | |
6208 | nft_commit_release(trans); | |
6209 | } | |
6210 | } | |
6211 | ||
0cbc06b3 FW |
6212 | static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain) |
6213 | { | |
6214 | struct nft_rule *rule; | |
6215 | unsigned int alloc = 0; | |
6216 | int i; | |
6217 | ||
6218 | /* already handled or inactive chain? */ | |
6219 | if (chain->rules_next || !nft_is_active_next(net, chain)) | |
6220 | return 0; | |
6221 | ||
6222 | rule = list_entry(&chain->rules, struct nft_rule, list); | |
6223 | i = 0; | |
6224 | ||
6225 | list_for_each_entry_continue(rule, &chain->rules, list) { | |
6226 | if (nft_is_active_next(net, rule)) | |
6227 | alloc++; | |
6228 | } | |
6229 | ||
6230 | chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc); | |
6231 | if (!chain->rules_next) | |
6232 | return -ENOMEM; | |
6233 | ||
6234 | list_for_each_entry_continue(rule, &chain->rules, list) { | |
6235 | if (nft_is_active_next(net, rule)) | |
6236 | chain->rules_next[i++] = rule; | |
6237 | } | |
6238 | ||
6239 | chain->rules_next[i] = NULL; | |
6240 | return 0; | |
6241 | } | |
6242 | ||
6243 | static void nf_tables_commit_chain_prepare_cancel(struct net *net) | |
6244 | { | |
6245 | struct nft_trans *trans, *next; | |
6246 | ||
6247 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
6248 | struct nft_chain *chain = trans->ctx.chain; | |
6249 | ||
6250 | if (trans->msg_type == NFT_MSG_NEWRULE || | |
6251 | trans->msg_type == NFT_MSG_DELRULE) { | |
6252 | kvfree(chain->rules_next); | |
6253 | chain->rules_next = NULL; | |
6254 | } | |
6255 | } | |
6256 | } | |
6257 | ||
6258 | static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h) | |
6259 | { | |
6260 | struct nft_rules_old *o = container_of(h, struct nft_rules_old, h); | |
6261 | ||
6262 | kvfree(o->start); | |
6263 | } | |
6264 | ||
6265 | static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules) | |
6266 | { | |
6267 | struct nft_rule **r = rules; | |
6268 | struct nft_rules_old *old; | |
6269 | ||
6270 | while (*r) | |
6271 | r++; | |
6272 | ||
6273 | r++; /* rcu_head is after end marker */ | |
6274 | old = (void *) r; | |
6275 | old->start = rules; | |
6276 | ||
6277 | call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old); | |
6278 | } | |
6279 | ||
6280 | static void nf_tables_commit_chain_active(struct net *net, struct nft_chain *chain) | |
6281 | { | |
6282 | struct nft_rule **g0, **g1; | |
6283 | bool next_genbit; | |
6284 | ||
6285 | next_genbit = nft_gencursor_next(net); | |
6286 | ||
6287 | g0 = rcu_dereference_protected(chain->rules_gen_0, | |
f102d66b | 6288 | lockdep_commit_lock_is_held(net)); |
0cbc06b3 | 6289 | g1 = rcu_dereference_protected(chain->rules_gen_1, |
f102d66b | 6290 | lockdep_commit_lock_is_held(net)); |
0cbc06b3 FW |
6291 | |
6292 | /* No changes to this chain? */ | |
6293 | if (chain->rules_next == NULL) { | |
6294 | /* chain had no change in last or next generation */ | |
6295 | if (g0 == g1) | |
6296 | return; | |
6297 | /* | |
6298 | * chain had no change in this generation; make sure next | |
6299 | * one uses same rules as current generation. | |
6300 | */ | |
6301 | if (next_genbit) { | |
6302 | rcu_assign_pointer(chain->rules_gen_1, g0); | |
6303 | nf_tables_commit_chain_free_rules_old(g1); | |
6304 | } else { | |
6305 | rcu_assign_pointer(chain->rules_gen_0, g1); | |
6306 | nf_tables_commit_chain_free_rules_old(g0); | |
6307 | } | |
6308 | ||
6309 | return; | |
6310 | } | |
6311 | ||
6312 | if (next_genbit) | |
6313 | rcu_assign_pointer(chain->rules_gen_1, chain->rules_next); | |
6314 | else | |
6315 | rcu_assign_pointer(chain->rules_gen_0, chain->rules_next); | |
6316 | ||
6317 | chain->rules_next = NULL; | |
6318 | ||
6319 | if (g0 == g1) | |
6320 | return; | |
6321 | ||
6322 | if (next_genbit) | |
6323 | nf_tables_commit_chain_free_rules_old(g1); | |
6324 | else | |
6325 | nf_tables_commit_chain_free_rules_old(g0); | |
6326 | } | |
6327 | ||
1b2470e5 FW |
6328 | static void nft_chain_del(struct nft_chain *chain) |
6329 | { | |
6330 | struct nft_table *table = chain->table; | |
6331 | ||
6332 | WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead, | |
6333 | nft_chain_ht_params)); | |
6334 | list_del_rcu(&chain->list); | |
6335 | } | |
6336 | ||
5913beaf | 6337 | static int nf_tables_commit(struct net *net, struct sk_buff *skb) |
37082f93 | 6338 | { |
37082f93 | 6339 | struct nft_trans *trans, *next; |
a3716e70 | 6340 | struct nft_trans_elem *te; |
0cbc06b3 FW |
6341 | struct nft_chain *chain; |
6342 | struct nft_table *table; | |
37082f93 | 6343 | |
a654de8f PNA |
6344 | /* 0. Validate ruleset, otherwise roll back for error reporting. */ |
6345 | if (nf_tables_validate(net) < 0) | |
6346 | return -EAGAIN; | |
6347 | ||
0cbc06b3 FW |
6348 | /* 1. Allocate space for next generation rules_gen_X[] */ |
6349 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
6350 | int ret; | |
37082f93 | 6351 | |
0cbc06b3 FW |
6352 | if (trans->msg_type == NFT_MSG_NEWRULE || |
6353 | trans->msg_type == NFT_MSG_DELRULE) { | |
6354 | chain = trans->ctx.chain; | |
6355 | ||
6356 | ret = nf_tables_commit_chain_prepare(net, chain); | |
6357 | if (ret < 0) { | |
6358 | nf_tables_commit_chain_prepare_cancel(net); | |
6359 | return ret; | |
6360 | } | |
6361 | } | |
6362 | } | |
37082f93 | 6363 | |
0cbc06b3 FW |
6364 | /* step 2. Make rules_gen_X visible to packet path */ |
6365 | list_for_each_entry(table, &net->nft.tables, list) { | |
6366 | list_for_each_entry(chain, &table->chains, list) { | |
6367 | if (!nft_is_active_next(net, chain)) | |
6368 | continue; | |
6369 | nf_tables_commit_chain_active(net, chain); | |
6370 | } | |
6371 | } | |
6372 | ||
6373 | /* | |
6374 | * Bump generation counter, invalidate any dump in progress. | |
6375 | * Cannot fail after this point. | |
37082f93 | 6376 | */ |
0cbc06b3 FW |
6377 | while (++net->nft.base_seq == 0); |
6378 | ||
6379 | /* step 3. Start new generation, rules_gen_X now in use. */ | |
6380 | net->nft.gencursor = nft_gencursor_next(net); | |
37082f93 PNA |
6381 | |
6382 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 6383 | switch (trans->msg_type) { |
55dd6f93 PNA |
6384 | case NFT_MSG_NEWTABLE: |
6385 | if (nft_trans_table_update(trans)) { | |
6386 | if (!nft_trans_table_enable(trans)) { | |
664b0f8c | 6387 | nf_tables_table_disable(net, |
55dd6f93 PNA |
6388 | trans->ctx.table); |
6389 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
6390 | } | |
6391 | } else { | |
f2a6d766 | 6392 | nft_clear(net, trans->ctx.table); |
55dd6f93 | 6393 | } |
35151d84 | 6394 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
6395 | nft_trans_destroy(trans); |
6396 | break; | |
6397 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 6398 | list_del_rcu(&trans->ctx.table->list); |
35151d84 | 6399 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 6400 | break; |
91c7b38d | 6401 | case NFT_MSG_NEWCHAIN: |
9f8aac0b | 6402 | if (nft_trans_chain_update(trans)) { |
91c7b38d | 6403 | nft_chain_commit_update(trans); |
9f8aac0b FW |
6404 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
6405 | /* trans destroyed after rcu grace period */ | |
6406 | } else { | |
664b0f8c | 6407 | nft_clear(net, trans->ctx.chain); |
9f8aac0b FW |
6408 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
6409 | nft_trans_destroy(trans); | |
6410 | } | |
91c7b38d PNA |
6411 | break; |
6412 | case NFT_MSG_DELCHAIN: | |
1b2470e5 | 6413 | nft_chain_del(trans->ctx.chain); |
35151d84 | 6414 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
c974a3a3 PNA |
6415 | nf_tables_unregister_hook(trans->ctx.net, |
6416 | trans->ctx.table, | |
6417 | trans->ctx.chain); | |
91c7b38d | 6418 | break; |
b380e5c7 | 6419 | case NFT_MSG_NEWRULE: |
889f7ee7 | 6420 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
35151d84 | 6421 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 6422 | nft_trans_rule(trans), |
35151d84 | 6423 | NFT_MSG_NEWRULE); |
37082f93 | 6424 | nft_trans_destroy(trans); |
b380e5c7 PNA |
6425 | break; |
6426 | case NFT_MSG_DELRULE: | |
6427 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
6428 | nf_tables_rule_notify(&trans->ctx, |
6429 | nft_trans_rule(trans), | |
6430 | NFT_MSG_DELRULE); | |
b380e5c7 | 6431 | break; |
958bee14 | 6432 | case NFT_MSG_NEWSET: |
37a9cc52 | 6433 | nft_clear(net, nft_trans_set(trans)); |
4fefee57 PNA |
6434 | /* This avoids hitting -EBUSY when deleting the table |
6435 | * from the transaction. | |
6436 | */ | |
408070d6 | 6437 | if (nft_set_is_anonymous(nft_trans_set(trans)) && |
4fefee57 PNA |
6438 | !list_empty(&nft_trans_set(trans)->bindings)) |
6439 | trans->ctx.table->use--; | |
6440 | ||
958bee14 | 6441 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 6442 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
6443 | nft_trans_destroy(trans); |
6444 | break; | |
6445 | case NFT_MSG_DELSET: | |
37a9cc52 | 6446 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 | 6447 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 6448 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 6449 | break; |
60319eb1 | 6450 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
6451 | te = (struct nft_trans_elem *)trans->data; |
6452 | ||
42a55769 | 6453 | te->set->ops->activate(net, te->set, &te->elem); |
cc02e457 PM |
6454 | nf_tables_setelem_notify(&trans->ctx, te->set, |
6455 | &te->elem, | |
60319eb1 PNA |
6456 | NFT_MSG_NEWSETELEM, 0); |
6457 | nft_trans_destroy(trans); | |
6458 | break; | |
6459 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 6460 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 6461 | |
a3716e70 PNA |
6462 | nf_tables_setelem_notify(&trans->ctx, te->set, |
6463 | &te->elem, | |
60319eb1 | 6464 | NFT_MSG_DELSETELEM, 0); |
5cb82a38 | 6465 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a PM |
6466 | atomic_dec(&te->set->nelems); |
6467 | te->set->ndeact--; | |
60319eb1 | 6468 | break; |
e5009240 PNA |
6469 | case NFT_MSG_NEWOBJ: |
6470 | nft_clear(net, nft_trans_obj(trans)); | |
6471 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
6472 | NFT_MSG_NEWOBJ); | |
6473 | nft_trans_destroy(trans); | |
6474 | break; | |
6475 | case NFT_MSG_DELOBJ: | |
6476 | list_del_rcu(&nft_trans_obj(trans)->list); | |
6477 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
6478 | NFT_MSG_DELOBJ); | |
6479 | break; | |
3b49e2e9 PNA |
6480 | case NFT_MSG_NEWFLOWTABLE: |
6481 | nft_clear(net, nft_trans_flowtable(trans)); | |
6482 | nf_tables_flowtable_notify(&trans->ctx, | |
6483 | nft_trans_flowtable(trans), | |
6484 | NFT_MSG_NEWFLOWTABLE); | |
6485 | nft_trans_destroy(trans); | |
6486 | break; | |
6487 | case NFT_MSG_DELFLOWTABLE: | |
6488 | list_del_rcu(&nft_trans_flowtable(trans)->list); | |
6489 | nf_tables_flowtable_notify(&trans->ctx, | |
6490 | nft_trans_flowtable(trans), | |
6491 | NFT_MSG_DELFLOWTABLE); | |
6492 | nft_unregister_flowtable_net_hooks(net, | |
6493 | nft_trans_flowtable(trans)); | |
6494 | break; | |
37082f93 | 6495 | } |
37082f93 PNA |
6496 | } |
6497 | ||
2f99aa31 | 6498 | nf_tables_commit_release(net); |
84d7fce6 | 6499 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); |
f102d66b | 6500 | mutex_unlock(&net->nft.commit_mutex); |
37082f93 PNA |
6501 | |
6502 | return 0; | |
6503 | } | |
6504 | ||
b326dd37 | 6505 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 6506 | { |
c7c32e72 PNA |
6507 | switch (trans->msg_type) { |
6508 | case NFT_MSG_NEWTABLE: | |
6509 | nf_tables_table_destroy(&trans->ctx); | |
6510 | break; | |
6511 | case NFT_MSG_NEWCHAIN: | |
43a605f2 | 6512 | nf_tables_chain_destroy(&trans->ctx); |
c7c32e72 PNA |
6513 | break; |
6514 | case NFT_MSG_NEWRULE: | |
6515 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
6516 | break; | |
6517 | case NFT_MSG_NEWSET: | |
6518 | nft_set_destroy(nft_trans_set(trans)); | |
6519 | break; | |
61edafbb PM |
6520 | case NFT_MSG_NEWSETELEM: |
6521 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 6522 | nft_trans_elem(trans).priv, true); |
61edafbb | 6523 | break; |
e5009240 | 6524 | case NFT_MSG_NEWOBJ: |
00bfb320 | 6525 | nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); |
e5009240 | 6526 | break; |
3b49e2e9 PNA |
6527 | case NFT_MSG_NEWFLOWTABLE: |
6528 | nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); | |
6529 | break; | |
c7c32e72 PNA |
6530 | } |
6531 | kfree(trans); | |
6532 | } | |
6533 | ||
71ad00c5 | 6534 | static int __nf_tables_abort(struct net *net) |
37082f93 | 6535 | { |
37082f93 | 6536 | struct nft_trans *trans, *next; |
02263db0 | 6537 | struct nft_trans_elem *te; |
37082f93 | 6538 | |
a907e36d XL |
6539 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
6540 | list) { | |
b380e5c7 | 6541 | switch (trans->msg_type) { |
55dd6f93 PNA |
6542 | case NFT_MSG_NEWTABLE: |
6543 | if (nft_trans_table_update(trans)) { | |
6544 | if (nft_trans_table_enable(trans)) { | |
664b0f8c | 6545 | nf_tables_table_disable(net, |
55dd6f93 PNA |
6546 | trans->ctx.table); |
6547 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
6548 | } | |
6549 | nft_trans_destroy(trans); | |
6550 | } else { | |
e688a7f8 | 6551 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
6552 | } |
6553 | break; | |
6554 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 6555 | nft_clear(trans->ctx.net, trans->ctx.table); |
55dd6f93 PNA |
6556 | nft_trans_destroy(trans); |
6557 | break; | |
91c7b38d PNA |
6558 | case NFT_MSG_NEWCHAIN: |
6559 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 6560 | free_percpu(nft_trans_chain_stats(trans)); |
9f8aac0b | 6561 | kfree(nft_trans_chain_name(trans)); |
91c7b38d PNA |
6562 | nft_trans_destroy(trans); |
6563 | } else { | |
4fefee57 | 6564 | trans->ctx.table->use--; |
1b2470e5 | 6565 | nft_chain_del(trans->ctx.chain); |
c974a3a3 PNA |
6566 | nf_tables_unregister_hook(trans->ctx.net, |
6567 | trans->ctx.table, | |
6568 | trans->ctx.chain); | |
91c7b38d PNA |
6569 | } |
6570 | break; | |
6571 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 6572 | trans->ctx.table->use++; |
664b0f8c | 6573 | nft_clear(trans->ctx.net, trans->ctx.chain); |
91c7b38d PNA |
6574 | nft_trans_destroy(trans); |
6575 | break; | |
b380e5c7 | 6576 | case NFT_MSG_NEWRULE: |
4fefee57 | 6577 | trans->ctx.chain->use--; |
b380e5c7 | 6578 | list_del_rcu(&nft_trans_rule(trans)->list); |
bb7b40ae | 6579 | nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans)); |
b380e5c7 PNA |
6580 | break; |
6581 | case NFT_MSG_DELRULE: | |
4fefee57 | 6582 | trans->ctx.chain->use++; |
889f7ee7 | 6583 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
bb7b40ae | 6584 | nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans)); |
37082f93 | 6585 | nft_trans_destroy(trans); |
b380e5c7 | 6586 | break; |
958bee14 | 6587 | case NFT_MSG_NEWSET: |
4fefee57 | 6588 | trans->ctx.table->use--; |
e688a7f8 | 6589 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
6590 | break; |
6591 | case NFT_MSG_DELSET: | |
4fefee57 | 6592 | trans->ctx.table->use++; |
37a9cc52 | 6593 | nft_clear(trans->ctx.net, nft_trans_set(trans)); |
958bee14 PNA |
6594 | nft_trans_destroy(trans); |
6595 | break; | |
60319eb1 | 6596 | case NFT_MSG_NEWSETELEM: |
02263db0 | 6597 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 6598 | |
5cb82a38 | 6599 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a | 6600 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
6601 | break; |
6602 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
6603 | te = (struct nft_trans_elem *)trans->data; |
6604 | ||
59105446 | 6605 | nft_set_elem_activate(net, te->set, &te->elem); |
42a55769 | 6606 | te->set->ops->activate(net, te->set, &te->elem); |
3dd0673a | 6607 | te->set->ndeact--; |
cc02e457 | 6608 | |
e5009240 PNA |
6609 | nft_trans_destroy(trans); |
6610 | break; | |
6611 | case NFT_MSG_NEWOBJ: | |
6612 | trans->ctx.table->use--; | |
6613 | list_del_rcu(&nft_trans_obj(trans)->list); | |
6614 | break; | |
6615 | case NFT_MSG_DELOBJ: | |
6616 | trans->ctx.table->use++; | |
6617 | nft_clear(trans->ctx.net, nft_trans_obj(trans)); | |
60319eb1 PNA |
6618 | nft_trans_destroy(trans); |
6619 | break; | |
3b49e2e9 PNA |
6620 | case NFT_MSG_NEWFLOWTABLE: |
6621 | trans->ctx.table->use--; | |
6622 | list_del_rcu(&nft_trans_flowtable(trans)->list); | |
6623 | nft_unregister_flowtable_net_hooks(net, | |
6624 | nft_trans_flowtable(trans)); | |
6625 | break; | |
6626 | case NFT_MSG_DELFLOWTABLE: | |
6627 | trans->ctx.table->use++; | |
6628 | nft_clear(trans->ctx.net, nft_trans_flowtable(trans)); | |
6629 | nft_trans_destroy(trans); | |
6630 | break; | |
37082f93 | 6631 | } |
37082f93 PNA |
6632 | } |
6633 | ||
b326dd37 PNA |
6634 | synchronize_rcu(); |
6635 | ||
a1cee076 PNA |
6636 | list_for_each_entry_safe_reverse(trans, next, |
6637 | &net->nft.commit_list, list) { | |
c7c32e72 | 6638 | list_del(&trans->list); |
b326dd37 | 6639 | nf_tables_abort_release(trans); |
37082f93 PNA |
6640 | } |
6641 | ||
6642 | return 0; | |
6643 | } | |
6644 | ||
a654de8f PNA |
6645 | static void nf_tables_cleanup(struct net *net) |
6646 | { | |
6647 | nft_validate_state_update(net, NFT_VALIDATE_SKIP); | |
6648 | } | |
6649 | ||
71ad00c5 FW |
6650 | static int nf_tables_abort(struct net *net, struct sk_buff *skb) |
6651 | { | |
f102d66b FW |
6652 | int ret = __nf_tables_abort(net); |
6653 | ||
6654 | mutex_unlock(&net->nft.commit_mutex); | |
6655 | ||
6656 | return ret; | |
71ad00c5 FW |
6657 | } |
6658 | ||
74e8bcd2 PNA |
6659 | static bool nf_tables_valid_genid(struct net *net, u32 genid) |
6660 | { | |
f102d66b FW |
6661 | bool genid_ok; |
6662 | ||
6663 | mutex_lock(&net->nft.commit_mutex); | |
6664 | ||
6665 | genid_ok = genid == 0 || net->nft.base_seq == genid; | |
6666 | if (!genid_ok) | |
6667 | mutex_unlock(&net->nft.commit_mutex); | |
6668 | ||
6669 | /* else, commit mutex has to be released by commit or abort function */ | |
6670 | return genid_ok; | |
74e8bcd2 PNA |
6671 | } |
6672 | ||
96518518 PM |
6673 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
6674 | .name = "nf_tables", | |
6675 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
6676 | .cb_count = NFT_MSG_MAX, | |
6677 | .cb = nf_tables_cb, | |
0628b123 PNA |
6678 | .commit = nf_tables_commit, |
6679 | .abort = nf_tables_abort, | |
a654de8f | 6680 | .cleanup = nf_tables_cleanup, |
74e8bcd2 | 6681 | .valid_genid = nf_tables_valid_genid, |
be2ab5b4 | 6682 | .owner = THIS_MODULE, |
96518518 PM |
6683 | }; |
6684 | ||
7210e4e3 | 6685 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
32537e91 | 6686 | enum nft_chain_types type) |
7210e4e3 PNA |
6687 | { |
6688 | const struct nft_base_chain *basechain; | |
6689 | ||
f323d954 | 6690 | if (nft_is_base_chain(chain)) { |
7210e4e3 PNA |
6691 | basechain = nft_base_chain(chain); |
6692 | if (basechain->type->type != type) | |
6693 | return -EOPNOTSUPP; | |
6694 | } | |
6695 | return 0; | |
6696 | } | |
6697 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
6698 | ||
75e8d06d PNA |
6699 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
6700 | unsigned int hook_flags) | |
6701 | { | |
6702 | struct nft_base_chain *basechain; | |
6703 | ||
f323d954 | 6704 | if (nft_is_base_chain(chain)) { |
75e8d06d PNA |
6705 | basechain = nft_base_chain(chain); |
6706 | ||
c974a3a3 | 6707 | if ((1 << basechain->ops.hooknum) & hook_flags) |
75e8d06d PNA |
6708 | return 0; |
6709 | ||
6710 | return -EOPNOTSUPP; | |
6711 | } | |
6712 | ||
6713 | return 0; | |
6714 | } | |
6715 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
6716 | ||
20a69341 PM |
6717 | /* |
6718 | * Loop detection - walk through the ruleset beginning at the destination chain | |
6719 | * of a new jump until either the source chain is reached (loop) or all | |
6720 | * reachable chains have been traversed. | |
6721 | * | |
6722 | * The loop check is performed whenever a new jump verdict is added to an | |
6723 | * expression or verdict map or a verdict map is bound to a new chain. | |
6724 | */ | |
6725 | ||
6726 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
6727 | const struct nft_chain *chain); | |
6728 | ||
6729 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 6730 | struct nft_set *set, |
20a69341 | 6731 | const struct nft_set_iter *iter, |
de70185d | 6732 | struct nft_set_elem *elem) |
20a69341 | 6733 | { |
fe2811eb PM |
6734 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
6735 | const struct nft_data *data; | |
6736 | ||
6737 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
6738 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
6739 | return 0; |
6740 | ||
fe2811eb | 6741 | data = nft_set_ext_data(ext); |
1ca2e170 | 6742 | switch (data->verdict.code) { |
20a69341 PM |
6743 | case NFT_JUMP: |
6744 | case NFT_GOTO: | |
1ca2e170 | 6745 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
6746 | default: |
6747 | return 0; | |
6748 | } | |
6749 | } | |
6750 | ||
6751 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
6752 | const struct nft_chain *chain) | |
6753 | { | |
6754 | const struct nft_rule *rule; | |
6755 | const struct nft_expr *expr, *last; | |
de70185d | 6756 | struct nft_set *set; |
20a69341 PM |
6757 | struct nft_set_binding *binding; |
6758 | struct nft_set_iter iter; | |
20a69341 PM |
6759 | |
6760 | if (ctx->chain == chain) | |
6761 | return -ELOOP; | |
6762 | ||
6763 | list_for_each_entry(rule, &chain->rules, list) { | |
6764 | nft_rule_for_each_expr(expr, last, rule) { | |
a654de8f PNA |
6765 | struct nft_immediate_expr *priv; |
6766 | const struct nft_data *data; | |
0ca743a5 PNA |
6767 | int err; |
6768 | ||
a654de8f | 6769 | if (strcmp(expr->ops->type->name, "immediate")) |
20a69341 PM |
6770 | continue; |
6771 | ||
a654de8f PNA |
6772 | priv = nft_expr_priv(expr); |
6773 | if (priv->dreg != NFT_REG_VERDICT) | |
0ca743a5 | 6774 | continue; |
20a69341 | 6775 | |
a654de8f | 6776 | data = &priv->data; |
1ca2e170 | 6777 | switch (data->verdict.code) { |
20a69341 PM |
6778 | case NFT_JUMP: |
6779 | case NFT_GOTO: | |
1ca2e170 PM |
6780 | err = nf_tables_check_loops(ctx, |
6781 | data->verdict.chain); | |
20a69341 PM |
6782 | if (err < 0) |
6783 | return err; | |
6784 | default: | |
6785 | break; | |
6786 | } | |
6787 | } | |
6788 | } | |
6789 | ||
6790 | list_for_each_entry(set, &ctx->table->sets, list) { | |
37a9cc52 PNA |
6791 | if (!nft_is_active_next(ctx->net, set)) |
6792 | continue; | |
20a69341 PM |
6793 | if (!(set->flags & NFT_SET_MAP) || |
6794 | set->dtype != NFT_DATA_VERDICT) | |
6795 | continue; | |
6796 | ||
6797 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
6798 | if (!(binding->flags & NFT_SET_MAP) || |
6799 | binding->chain != chain) | |
20a69341 PM |
6800 | continue; |
6801 | ||
8588ac09 | 6802 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
6803 | iter.skip = 0; |
6804 | iter.count = 0; | |
6805 | iter.err = 0; | |
6806 | iter.fn = nf_tables_loop_check_setelem; | |
6807 | ||
6808 | set->ops->walk(ctx, set, &iter); | |
6809 | if (iter.err < 0) | |
6810 | return iter.err; | |
6811 | } | |
6812 | } | |
6813 | ||
6814 | return 0; | |
6815 | } | |
6816 | ||
36b701fa LGL |
6817 | /** |
6818 | * nft_parse_u32_check - fetch u32 attribute and check for maximum value | |
6819 | * | |
6820 | * @attr: netlink attribute to fetch value from | |
6821 | * @max: maximum value to be stored in dest | |
6822 | * @dest: pointer to the variable | |
6823 | * | |
6824 | * Parse, check and store a given u32 netlink attribute into variable. | |
6825 | * This function returns -ERANGE if the value goes over maximum value. | |
6826 | * Otherwise a 0 is returned and the attribute value is stored in the | |
6827 | * destination variable. | |
6828 | */ | |
f1d505bb | 6829 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) |
36b701fa | 6830 | { |
09525a09 | 6831 | u32 val; |
36b701fa LGL |
6832 | |
6833 | val = ntohl(nla_get_be32(attr)); | |
6834 | if (val > max) | |
6835 | return -ERANGE; | |
6836 | ||
6837 | *dest = val; | |
6838 | return 0; | |
6839 | } | |
6840 | EXPORT_SYMBOL_GPL(nft_parse_u32_check); | |
6841 | ||
49499c3e PM |
6842 | /** |
6843 | * nft_parse_register - parse a register value from a netlink attribute | |
6844 | * | |
6845 | * @attr: netlink attribute | |
6846 | * | |
6847 | * Parse and translate a register value from a netlink attribute. | |
6848 | * Registers used to be 128 bit wide, these register numbers will be | |
6849 | * mapped to the corresponding 32 bit register numbers. | |
6850 | */ | |
b1c96ed3 PM |
6851 | unsigned int nft_parse_register(const struct nlattr *attr) |
6852 | { | |
49499c3e PM |
6853 | unsigned int reg; |
6854 | ||
6855 | reg = ntohl(nla_get_be32(attr)); | |
6856 | switch (reg) { | |
6857 | case NFT_REG_VERDICT...NFT_REG_4: | |
6858 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
6859 | default: | |
6860 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
6861 | } | |
b1c96ed3 PM |
6862 | } |
6863 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
6864 | ||
49499c3e PM |
6865 | /** |
6866 | * nft_dump_register - dump a register value to a netlink attribute | |
6867 | * | |
6868 | * @skb: socket buffer | |
6869 | * @attr: attribute number | |
6870 | * @reg: register number | |
6871 | * | |
6872 | * Construct a netlink attribute containing the register number. For | |
6873 | * compatibility reasons, register numbers being a multiple of 4 are | |
6874 | * translated to the corresponding 128 bit register numbers. | |
6875 | */ | |
b1c96ed3 PM |
6876 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
6877 | { | |
49499c3e PM |
6878 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
6879 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
6880 | else | |
6881 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
6882 | ||
b1c96ed3 PM |
6883 | return nla_put_be32(skb, attr, htonl(reg)); |
6884 | } | |
6885 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
6886 | ||
96518518 | 6887 | /** |
d07db988 | 6888 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
6889 | * |
6890 | * @reg: the register number | |
d07db988 | 6891 | * @len: the length of the data |
96518518 PM |
6892 | * |
6893 | * Validate that the input register is one of the general purpose | |
d07db988 | 6894 | * registers and that the length of the load is within the bounds. |
96518518 | 6895 | */ |
d07db988 | 6896 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 6897 | { |
49499c3e | 6898 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 6899 | return -EINVAL; |
d07db988 PM |
6900 | if (len == 0) |
6901 | return -EINVAL; | |
49499c3e | 6902 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 6903 | return -ERANGE; |
49499c3e | 6904 | |
96518518 PM |
6905 | return 0; |
6906 | } | |
d07db988 | 6907 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 6908 | |
96518518 | 6909 | /** |
1ec10212 | 6910 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
6911 | * |
6912 | * @ctx: context of the expression performing the load | |
6913 | * @reg: the destination register number | |
6914 | * @data: the data to load | |
6915 | * @type: the data type | |
45d9bcda | 6916 | * @len: the length of the data |
96518518 PM |
6917 | * |
6918 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
6919 | * the destination register and the length is within the bounds. |
6920 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 6921 | * data. |
96518518 | 6922 | */ |
1ec10212 PM |
6923 | int nft_validate_register_store(const struct nft_ctx *ctx, |
6924 | enum nft_registers reg, | |
6925 | const struct nft_data *data, | |
6926 | enum nft_data_types type, unsigned int len) | |
96518518 | 6927 | { |
20a69341 PM |
6928 | int err; |
6929 | ||
96518518 PM |
6930 | switch (reg) { |
6931 | case NFT_REG_VERDICT: | |
58f40ab6 | 6932 | if (type != NFT_DATA_VERDICT) |
96518518 | 6933 | return -EINVAL; |
20a69341 | 6934 | |
58f40ab6 | 6935 | if (data != NULL && |
1ca2e170 PM |
6936 | (data->verdict.code == NFT_GOTO || |
6937 | data->verdict.code == NFT_JUMP)) { | |
6938 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
6939 | if (err < 0) |
6940 | return err; | |
20a69341 PM |
6941 | } |
6942 | ||
96518518 PM |
6943 | return 0; |
6944 | default: | |
49499c3e | 6945 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 6946 | return -EINVAL; |
45d9bcda PM |
6947 | if (len == 0) |
6948 | return -EINVAL; | |
49499c3e PM |
6949 | if (reg * NFT_REG32_SIZE + len > |
6950 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 6951 | return -ERANGE; |
27e6d201 | 6952 | |
96518518 PM |
6953 | if (data != NULL && type != NFT_DATA_VALUE) |
6954 | return -EINVAL; | |
6955 | return 0; | |
6956 | } | |
6957 | } | |
1ec10212 | 6958 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
6959 | |
6960 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
6961 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
6962 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
6963 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
6964 | }; | |
6965 | ||
6966 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
6967 | struct nft_data_desc *desc, const struct nlattr *nla) | |
6968 | { | |
664b0f8c | 6969 | u8 genmask = nft_genmask_next(ctx->net); |
96518518 PM |
6970 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
6971 | struct nft_chain *chain; | |
6972 | int err; | |
6973 | ||
fceb6435 JB |
6974 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy, |
6975 | NULL); | |
96518518 PM |
6976 | if (err < 0) |
6977 | return err; | |
6978 | ||
6979 | if (!tb[NFTA_VERDICT_CODE]) | |
6980 | return -EINVAL; | |
1ca2e170 | 6981 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 6982 | |
1ca2e170 | 6983 | switch (data->verdict.code) { |
e0abdadc | 6984 | default: |
1ca2e170 | 6985 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
6986 | case NF_ACCEPT: |
6987 | case NF_DROP: | |
6988 | case NF_QUEUE: | |
6989 | break; | |
6990 | default: | |
6991 | return -EINVAL; | |
6992 | } | |
6993 | /* fall through */ | |
96518518 PM |
6994 | case NFT_CONTINUE: |
6995 | case NFT_BREAK: | |
6996 | case NFT_RETURN: | |
96518518 PM |
6997 | break; |
6998 | case NFT_JUMP: | |
6999 | case NFT_GOTO: | |
7000 | if (!tb[NFTA_VERDICT_CHAIN]) | |
7001 | return -EINVAL; | |
f102d66b FW |
7002 | chain = nft_chain_lookup(ctx->net, ctx->table, |
7003 | tb[NFTA_VERDICT_CHAIN], genmask); | |
96518518 PM |
7004 | if (IS_ERR(chain)) |
7005 | return PTR_ERR(chain); | |
f323d954 | 7006 | if (nft_is_base_chain(chain)) |
96518518 PM |
7007 | return -EOPNOTSUPP; |
7008 | ||
96518518 | 7009 | chain->use++; |
1ca2e170 | 7010 | data->verdict.chain = chain; |
96518518 | 7011 | break; |
96518518 PM |
7012 | } |
7013 | ||
4c4ed074 | 7014 | desc->len = sizeof(data->verdict); |
96518518 PM |
7015 | desc->type = NFT_DATA_VERDICT; |
7016 | return 0; | |
7017 | } | |
7018 | ||
7019 | static void nft_verdict_uninit(const struct nft_data *data) | |
7020 | { | |
1ca2e170 | 7021 | switch (data->verdict.code) { |
96518518 PM |
7022 | case NFT_JUMP: |
7023 | case NFT_GOTO: | |
1ca2e170 | 7024 | data->verdict.chain->use--; |
96518518 PM |
7025 | break; |
7026 | } | |
7027 | } | |
7028 | ||
33d5a7b1 | 7029 | int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) |
96518518 PM |
7030 | { |
7031 | struct nlattr *nest; | |
7032 | ||
33d5a7b1 | 7033 | nest = nla_nest_start(skb, type); |
96518518 PM |
7034 | if (!nest) |
7035 | goto nla_put_failure; | |
7036 | ||
33d5a7b1 | 7037 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) |
96518518 PM |
7038 | goto nla_put_failure; |
7039 | ||
33d5a7b1 | 7040 | switch (v->code) { |
96518518 PM |
7041 | case NFT_JUMP: |
7042 | case NFT_GOTO: | |
1ca2e170 | 7043 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
33d5a7b1 | 7044 | v->chain->name)) |
96518518 PM |
7045 | goto nla_put_failure; |
7046 | } | |
7047 | nla_nest_end(skb, nest); | |
7048 | return 0; | |
7049 | ||
7050 | nla_put_failure: | |
7051 | return -1; | |
7052 | } | |
7053 | ||
d0a11fc3 PM |
7054 | static int nft_value_init(const struct nft_ctx *ctx, |
7055 | struct nft_data *data, unsigned int size, | |
96518518 PM |
7056 | struct nft_data_desc *desc, const struct nlattr *nla) |
7057 | { | |
7058 | unsigned int len; | |
7059 | ||
7060 | len = nla_len(nla); | |
7061 | if (len == 0) | |
7062 | return -EINVAL; | |
d0a11fc3 | 7063 | if (len > size) |
96518518 PM |
7064 | return -EOVERFLOW; |
7065 | ||
d0a11fc3 | 7066 | nla_memcpy(data->data, nla, len); |
96518518 PM |
7067 | desc->type = NFT_DATA_VALUE; |
7068 | desc->len = len; | |
7069 | return 0; | |
7070 | } | |
7071 | ||
7072 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
7073 | unsigned int len) | |
7074 | { | |
7075 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
7076 | } | |
7077 | ||
7078 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 7079 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
7080 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
7081 | }; | |
7082 | ||
7083 | /** | |
7084 | * nft_data_init - parse nf_tables data netlink attributes | |
7085 | * | |
7086 | * @ctx: context of the expression using the data | |
7087 | * @data: destination struct nft_data | |
d0a11fc3 | 7088 | * @size: maximum data length |
96518518 PM |
7089 | * @desc: data description |
7090 | * @nla: netlink attribute containing data | |
7091 | * | |
7092 | * Parse the netlink data attributes and initialize a struct nft_data. | |
7093 | * The type and length of data are returned in the data description. | |
7094 | * | |
7095 | * The caller can indicate that it only wants to accept data of type | |
7096 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
7097 | */ | |
d0a11fc3 PM |
7098 | int nft_data_init(const struct nft_ctx *ctx, |
7099 | struct nft_data *data, unsigned int size, | |
96518518 PM |
7100 | struct nft_data_desc *desc, const struct nlattr *nla) |
7101 | { | |
7102 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
7103 | int err; | |
7104 | ||
fceb6435 | 7105 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL); |
96518518 PM |
7106 | if (err < 0) |
7107 | return err; | |
7108 | ||
7109 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
7110 | return nft_value_init(ctx, data, size, desc, |
7111 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
7112 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
7113 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
7114 | return -EINVAL; | |
7115 | } | |
7116 | EXPORT_SYMBOL_GPL(nft_data_init); | |
7117 | ||
7118 | /** | |
59105446 | 7119 | * nft_data_release - release a nft_data item |
96518518 PM |
7120 | * |
7121 | * @data: struct nft_data to release | |
7122 | * @type: type of data | |
7123 | * | |
7124 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
7125 | * all others need to be released by calling this function. | |
7126 | */ | |
59105446 | 7127 | void nft_data_release(const struct nft_data *data, enum nft_data_types type) |
96518518 | 7128 | { |
960bd2c2 | 7129 | if (type < NFT_DATA_VERDICT) |
96518518 | 7130 | return; |
960bd2c2 | 7131 | switch (type) { |
96518518 PM |
7132 | case NFT_DATA_VERDICT: |
7133 | return nft_verdict_uninit(data); | |
7134 | default: | |
7135 | WARN_ON(1); | |
7136 | } | |
7137 | } | |
59105446 | 7138 | EXPORT_SYMBOL_GPL(nft_data_release); |
96518518 PM |
7139 | |
7140 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
7141 | enum nft_data_types type, unsigned int len) | |
7142 | { | |
7143 | struct nlattr *nest; | |
7144 | int err; | |
7145 | ||
7146 | nest = nla_nest_start(skb, attr); | |
7147 | if (nest == NULL) | |
7148 | return -1; | |
7149 | ||
7150 | switch (type) { | |
7151 | case NFT_DATA_VALUE: | |
7152 | err = nft_value_dump(skb, data, len); | |
7153 | break; | |
7154 | case NFT_DATA_VERDICT: | |
33d5a7b1 | 7155 | err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); |
96518518 PM |
7156 | break; |
7157 | default: | |
7158 | err = -EINVAL; | |
7159 | WARN_ON(1); | |
7160 | } | |
7161 | ||
7162 | nla_nest_end(skb, nest); | |
7163 | return err; | |
7164 | } | |
7165 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
7166 | ||
5ebe0b0e PNA |
7167 | int __nft_release_basechain(struct nft_ctx *ctx) |
7168 | { | |
7169 | struct nft_rule *rule, *nr; | |
7170 | ||
f323d954 | 7171 | BUG_ON(!nft_is_base_chain(ctx->chain)); |
5ebe0b0e | 7172 | |
c974a3a3 | 7173 | nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain); |
5ebe0b0e PNA |
7174 | list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { |
7175 | list_del(&rule->list); | |
7176 | ctx->chain->use--; | |
bb7b40ae | 7177 | nf_tables_rule_release(ctx, rule); |
5ebe0b0e | 7178 | } |
1b2470e5 | 7179 | nft_chain_del(ctx->chain); |
5ebe0b0e | 7180 | ctx->table->use--; |
43a605f2 | 7181 | nf_tables_chain_destroy(ctx); |
5ebe0b0e PNA |
7182 | |
7183 | return 0; | |
7184 | } | |
7185 | EXPORT_SYMBOL_GPL(__nft_release_basechain); | |
7186 | ||
98319cb9 | 7187 | static void __nft_release_tables(struct net *net) |
df05ef87 | 7188 | { |
3b49e2e9 | 7189 | struct nft_flowtable *flowtable, *nf; |
df05ef87 PNA |
7190 | struct nft_table *table, *nt; |
7191 | struct nft_chain *chain, *nc; | |
e5009240 | 7192 | struct nft_object *obj, *ne; |
df05ef87 PNA |
7193 | struct nft_rule *rule, *nr; |
7194 | struct nft_set *set, *ns; | |
7195 | struct nft_ctx ctx = { | |
7196 | .net = net, | |
43a605f2 | 7197 | .family = NFPROTO_NETDEV, |
df05ef87 PNA |
7198 | }; |
7199 | ||
36596dad | 7200 | list_for_each_entry_safe(table, nt, &net->nft.tables, list) { |
98319cb9 | 7201 | ctx.family = table->family; |
dd4cbef7 | 7202 | |
df05ef87 | 7203 | list_for_each_entry(chain, &table->chains, list) |
c974a3a3 | 7204 | nf_tables_unregister_hook(net, table, chain); |
3b49e2e9 PNA |
7205 | list_for_each_entry(flowtable, &table->flowtables, list) |
7206 | nf_unregister_net_hooks(net, flowtable->ops, | |
7207 | flowtable->ops_len); | |
df05ef87 PNA |
7208 | /* No packets are walking on these chains anymore. */ |
7209 | ctx.table = table; | |
7210 | list_for_each_entry(chain, &table->chains, list) { | |
7211 | ctx.chain = chain; | |
7212 | list_for_each_entry_safe(rule, nr, &chain->rules, list) { | |
7213 | list_del(&rule->list); | |
7214 | chain->use--; | |
bb7b40ae | 7215 | nf_tables_rule_release(&ctx, rule); |
df05ef87 PNA |
7216 | } |
7217 | } | |
3b49e2e9 PNA |
7218 | list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) { |
7219 | list_del(&flowtable->list); | |
7220 | table->use--; | |
7221 | nf_tables_flowtable_destroy(flowtable); | |
7222 | } | |
df05ef87 PNA |
7223 | list_for_each_entry_safe(set, ns, &table->sets, list) { |
7224 | list_del(&set->list); | |
7225 | table->use--; | |
7226 | nft_set_destroy(set); | |
7227 | } | |
e5009240 PNA |
7228 | list_for_each_entry_safe(obj, ne, &table->objects, list) { |
7229 | list_del(&obj->list); | |
7230 | table->use--; | |
00bfb320 | 7231 | nft_obj_destroy(&ctx, obj); |
e5009240 | 7232 | } |
df05ef87 | 7233 | list_for_each_entry_safe(chain, nc, &table->chains, list) { |
43a605f2 | 7234 | ctx.chain = chain; |
1b2470e5 | 7235 | nft_chain_del(chain); |
df05ef87 | 7236 | table->use--; |
43a605f2 | 7237 | nf_tables_chain_destroy(&ctx); |
df05ef87 PNA |
7238 | } |
7239 | list_del(&table->list); | |
7240 | nf_tables_table_destroy(&ctx); | |
7241 | } | |
7242 | } | |
7243 | ||
dd4cbef7 PNA |
7244 | static int __net_init nf_tables_init_net(struct net *net) |
7245 | { | |
7246 | INIT_LIST_HEAD(&net->nft.tables); | |
7247 | INIT_LIST_HEAD(&net->nft.commit_list); | |
f102d66b | 7248 | mutex_init(&net->nft.commit_mutex); |
dd4cbef7 | 7249 | net->nft.base_seq = 1; |
a654de8f PNA |
7250 | net->nft.validate_state = NFT_VALIDATE_SKIP; |
7251 | ||
dd4cbef7 PNA |
7252 | return 0; |
7253 | } | |
7254 | ||
7255 | static void __net_exit nf_tables_exit_net(struct net *net) | |
7256 | { | |
f102d66b | 7257 | mutex_lock(&net->nft.commit_mutex); |
71ad00c5 FW |
7258 | if (!list_empty(&net->nft.commit_list)) |
7259 | __nf_tables_abort(net); | |
98319cb9 | 7260 | __nft_release_tables(net); |
f102d66b | 7261 | mutex_unlock(&net->nft.commit_mutex); |
dd4cbef7 | 7262 | WARN_ON_ONCE(!list_empty(&net->nft.tables)); |
dd4cbef7 PNA |
7263 | } |
7264 | ||
99633ab2 PNA |
7265 | static struct pernet_operations nf_tables_net_ops = { |
7266 | .init = nf_tables_init_net, | |
613d0776 | 7267 | .exit = nf_tables_exit_net, |
99633ab2 PNA |
7268 | }; |
7269 | ||
96518518 PM |
7270 | static int __init nf_tables_module_init(void) |
7271 | { | |
7272 | int err; | |
7273 | ||
d209df3e FW |
7274 | err = register_pernet_subsys(&nf_tables_net_ops); |
7275 | if (err < 0) | |
7276 | return err; | |
7277 | ||
7278 | err = nft_chain_filter_init(); | |
7279 | if (err < 0) | |
7280 | goto err1; | |
02c7b25e | 7281 | |
96518518 PM |
7282 | err = nf_tables_core_module_init(); |
7283 | if (err < 0) | |
d209df3e | 7284 | goto err2; |
96518518 | 7285 | |
d209df3e | 7286 | err = register_netdevice_notifier(&nf_tables_flowtable_notifier); |
96518518 | 7287 | if (err < 0) |
d209df3e | 7288 | goto err3; |
96518518 | 7289 | |
d209df3e FW |
7290 | /* must be last */ |
7291 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
7292 | if (err < 0) | |
7293 | goto err4; | |
3b49e2e9 | 7294 | |
d209df3e FW |
7295 | return err; |
7296 | err4: | |
7297 | unregister_netdevice_notifier(&nf_tables_flowtable_notifier); | |
7298 | err3: | |
96518518 | 7299 | nf_tables_core_module_exit(); |
d209df3e FW |
7300 | err2: |
7301 | nft_chain_filter_fini(); | |
7302 | err1: | |
7303 | unregister_pernet_subsys(&nf_tables_net_ops); | |
96518518 PM |
7304 | return err; |
7305 | } | |
7306 | ||
7307 | static void __exit nf_tables_module_exit(void) | |
7308 | { | |
7309 | nfnetlink_subsys_unregister(&nf_tables_subsys); | |
3b49e2e9 | 7310 | unregister_netdevice_notifier(&nf_tables_flowtable_notifier); |
0a2cf5ee | 7311 | nft_chain_filter_fini(); |
71ad00c5 | 7312 | unregister_pernet_subsys(&nf_tables_net_ops); |
1b1bc49c | 7313 | rcu_barrier(); |
96518518 | 7314 | nf_tables_core_module_exit(); |
96518518 PM |
7315 | } |
7316 | ||
7317 | module_init(nf_tables_module_init); | |
7318 | module_exit(nf_tables_module_exit); | |
7319 | ||
7320 | MODULE_LICENSE("GPL"); | |
7321 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
7322 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |