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Commit | Line | Data |
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96518518 | 1 | /* |
20a69341 | 2 | * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netlink.h> | |
1ff75a3e | 16 | #include <linux/vmalloc.h> |
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); |
0935d558 FW |
30 | static LIST_HEAD(nf_tables_destroy_list); |
31 | static DEFINE_SPINLOCK(nf_tables_destroy_list_lock); | |
3ecbfd65 | 32 | static u64 table_handle; |
96518518 | 33 | |
a654de8f PNA |
34 | enum { |
35 | NFT_VALIDATE_SKIP = 0, | |
36 | NFT_VALIDATE_NEED, | |
37 | NFT_VALIDATE_DO, | |
38 | }; | |
39 | ||
1b2470e5 FW |
40 | static u32 nft_chain_hash(const void *data, u32 len, u32 seed); |
41 | static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed); | |
42 | static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *); | |
43 | ||
44 | static const struct rhashtable_params nft_chain_ht_params = { | |
45 | .head_offset = offsetof(struct nft_chain, rhlhead), | |
46 | .key_offset = offsetof(struct nft_chain, name), | |
47 | .hashfn = nft_chain_hash, | |
48 | .obj_hashfn = nft_chain_hash_obj, | |
49 | .obj_cmpfn = nft_chain_hash_cmp, | |
50 | .locks_mul = 1, | |
51 | .automatic_shrinking = true, | |
52 | }; | |
53 | ||
a654de8f PNA |
54 | static void nft_validate_state_update(struct net *net, u8 new_validate_state) |
55 | { | |
56 | switch (net->nft.validate_state) { | |
57 | case NFT_VALIDATE_SKIP: | |
58 | WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO); | |
59 | break; | |
60 | case NFT_VALIDATE_NEED: | |
61 | break; | |
62 | case NFT_VALIDATE_DO: | |
63 | if (new_validate_state == NFT_VALIDATE_NEED) | |
64 | return; | |
65 | } | |
66 | ||
67 | net->nft.validate_state = new_validate_state; | |
68 | } | |
0935d558 FW |
69 | static void nf_tables_trans_destroy_work(struct work_struct *w); |
70 | static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work); | |
a654de8f | 71 | |
7c95f6d8 | 72 | static void nft_ctx_init(struct nft_ctx *ctx, |
633c9a84 | 73 | struct net *net, |
7c95f6d8 PNA |
74 | const struct sk_buff *skb, |
75 | const struct nlmsghdr *nlh, | |
36596dad | 76 | u8 family, |
7c95f6d8 PNA |
77 | struct nft_table *table, |
78 | struct nft_chain *chain, | |
79 | const struct nlattr * const *nla) | |
80 | { | |
633c9a84 | 81 | ctx->net = net; |
36596dad | 82 | ctx->family = family; |
26b2f552 | 83 | ctx->level = 0; |
128ad332 PNA |
84 | ctx->table = table; |
85 | ctx->chain = chain; | |
86 | ctx->nla = nla; | |
87 | ctx->portid = NETLINK_CB(skb).portid; | |
88 | ctx->report = nlmsg_report(nlh); | |
89 | ctx->seq = nlh->nlmsg_seq; | |
7c95f6d8 PNA |
90 | } |
91 | ||
8411b644 PNA |
92 | static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx, |
93 | int msg_type, u32 size, gfp_t gfp) | |
1081d11b PNA |
94 | { |
95 | struct nft_trans *trans; | |
96 | ||
8411b644 | 97 | trans = kzalloc(sizeof(struct nft_trans) + size, gfp); |
1081d11b PNA |
98 | if (trans == NULL) |
99 | return NULL; | |
100 | ||
b380e5c7 | 101 | trans->msg_type = msg_type; |
1081d11b PNA |
102 | trans->ctx = *ctx; |
103 | ||
104 | return trans; | |
105 | } | |
106 | ||
8411b644 PNA |
107 | static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx, |
108 | int msg_type, u32 size) | |
109 | { | |
110 | return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL); | |
111 | } | |
112 | ||
1081d11b PNA |
113 | static void nft_trans_destroy(struct nft_trans *trans) |
114 | { | |
115 | list_del(&trans->list); | |
116 | kfree(trans); | |
117 | } | |
118 | ||
c974a3a3 PNA |
119 | static int nf_tables_register_hook(struct net *net, |
120 | const struct nft_table *table, | |
121 | struct nft_chain *chain) | |
d8ee8f7c | 122 | { |
4e25ceb8 | 123 | const struct nft_base_chain *basechain; |
a37061a6 | 124 | const struct nf_hook_ops *ops; |
ae6153b5 | 125 | |
d8ee8f7c | 126 | if (table->flags & NFT_TABLE_F_DORMANT || |
f323d954 | 127 | !nft_is_base_chain(chain)) |
d8ee8f7c PNA |
128 | return 0; |
129 | ||
4e25ceb8 FW |
130 | basechain = nft_base_chain(chain); |
131 | ops = &basechain->ops; | |
ae6153b5 | 132 | |
4e25ceb8 FW |
133 | if (basechain->type->ops_register) |
134 | return basechain->type->ops_register(net, ops); | |
135 | ||
a37061a6 | 136 | return nf_register_net_hook(net, ops); |
d8ee8f7c PNA |
137 | } |
138 | ||
c974a3a3 PNA |
139 | static void nf_tables_unregister_hook(struct net *net, |
140 | const struct nft_table *table, | |
141 | struct nft_chain *chain) | |
c5598794 | 142 | { |
4e25ceb8 FW |
143 | const struct nft_base_chain *basechain; |
144 | const struct nf_hook_ops *ops; | |
145 | ||
d8ee8f7c | 146 | if (table->flags & NFT_TABLE_F_DORMANT || |
f323d954 | 147 | !nft_is_base_chain(chain)) |
d8ee8f7c | 148 | return; |
4e25ceb8 FW |
149 | basechain = nft_base_chain(chain); |
150 | ops = &basechain->ops; | |
d8ee8f7c | 151 | |
4e25ceb8 FW |
152 | if (basechain->type->ops_unregister) |
153 | return basechain->type->ops_unregister(net, ops); | |
154 | ||
155 | nf_unregister_net_hook(net, ops); | |
c5598794 AB |
156 | } |
157 | ||
ee01d542 AB |
158 | static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) |
159 | { | |
160 | struct nft_trans *trans; | |
161 | ||
162 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); | |
163 | if (trans == NULL) | |
164 | return -ENOMEM; | |
165 | ||
166 | if (msg_type == NFT_MSG_NEWTABLE) | |
f2a6d766 | 167 | nft_activate_next(ctx->net, ctx->table); |
ee01d542 AB |
168 | |
169 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static int nft_deltable(struct nft_ctx *ctx) | |
174 | { | |
175 | int err; | |
176 | ||
177 | err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); | |
178 | if (err < 0) | |
179 | return err; | |
180 | ||
f2a6d766 | 181 | nft_deactivate_next(ctx->net, ctx->table); |
ee01d542 AB |
182 | return err; |
183 | } | |
184 | ||
185 | static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) | |
186 | { | |
187 | struct nft_trans *trans; | |
188 | ||
189 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); | |
190 | if (trans == NULL) | |
191 | return -ENOMEM; | |
192 | ||
193 | if (msg_type == NFT_MSG_NEWCHAIN) | |
664b0f8c | 194 | nft_activate_next(ctx->net, ctx->chain); |
ee01d542 AB |
195 | |
196 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static int nft_delchain(struct nft_ctx *ctx) | |
201 | { | |
202 | int err; | |
203 | ||
204 | err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); | |
205 | if (err < 0) | |
206 | return err; | |
207 | ||
208 | ctx->table->use--; | |
664b0f8c | 209 | nft_deactivate_next(ctx->net, ctx->chain); |
ee01d542 AB |
210 | |
211 | return err; | |
212 | } | |
213 | ||
0ef235c7 FW |
214 | /* either expr ops provide both activate/deactivate, or neither */ |
215 | static bool nft_expr_check_ops(const struct nft_expr_ops *ops) | |
216 | { | |
217 | if (!ops) | |
218 | return true; | |
219 | ||
220 | if (WARN_ON_ONCE((!ops->activate ^ !ops->deactivate))) | |
221 | return false; | |
222 | ||
223 | return true; | |
224 | } | |
225 | ||
bb7b40ae PNA |
226 | static void nft_rule_expr_activate(const struct nft_ctx *ctx, |
227 | struct nft_rule *rule) | |
228 | { | |
229 | struct nft_expr *expr; | |
230 | ||
231 | expr = nft_expr_first(rule); | |
232 | while (expr != nft_expr_last(rule) && expr->ops) { | |
233 | if (expr->ops->activate) | |
234 | expr->ops->activate(ctx, expr); | |
235 | ||
236 | expr = nft_expr_next(expr); | |
237 | } | |
238 | } | |
239 | ||
240 | static void nft_rule_expr_deactivate(const struct nft_ctx *ctx, | |
241 | struct nft_rule *rule) | |
242 | { | |
243 | struct nft_expr *expr; | |
244 | ||
245 | expr = nft_expr_first(rule); | |
246 | while (expr != nft_expr_last(rule) && expr->ops) { | |
247 | if (expr->ops->deactivate) | |
248 | expr->ops->deactivate(ctx, expr); | |
249 | ||
250 | expr = nft_expr_next(expr); | |
251 | } | |
252 | } | |
253 | ||
ee01d542 AB |
254 | static int |
255 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) | |
256 | { | |
257 | /* You cannot delete the same rule twice */ | |
889f7ee7 PNA |
258 | if (nft_is_active_next(ctx->net, rule)) { |
259 | nft_deactivate_next(ctx->net, rule); | |
ee01d542 AB |
260 | ctx->chain->use--; |
261 | return 0; | |
262 | } | |
263 | return -ENOENT; | |
264 | } | |
265 | ||
266 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, | |
267 | struct nft_rule *rule) | |
268 | { | |
269 | struct nft_trans *trans; | |
270 | ||
271 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); | |
272 | if (trans == NULL) | |
273 | return NULL; | |
274 | ||
1a94e38d PNA |
275 | if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) { |
276 | nft_trans_rule_id(trans) = | |
277 | ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID])); | |
278 | } | |
ee01d542 AB |
279 | nft_trans_rule(trans) = rule; |
280 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
281 | ||
282 | return trans; | |
283 | } | |
284 | ||
285 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) | |
286 | { | |
287 | struct nft_trans *trans; | |
288 | int err; | |
289 | ||
290 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); | |
291 | if (trans == NULL) | |
292 | return -ENOMEM; | |
293 | ||
294 | err = nf_tables_delrule_deactivate(ctx, rule); | |
295 | if (err < 0) { | |
296 | nft_trans_destroy(trans); | |
297 | return err; | |
298 | } | |
bb7b40ae | 299 | nft_rule_expr_deactivate(ctx, rule); |
ee01d542 AB |
300 | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static int nft_delrule_by_chain(struct nft_ctx *ctx) | |
305 | { | |
306 | struct nft_rule *rule; | |
307 | int err; | |
308 | ||
309 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
310 | err = nft_delrule(ctx, rule); | |
311 | if (err < 0) | |
312 | return err; | |
313 | } | |
314 | return 0; | |
315 | } | |
316 | ||
cd5125d8 | 317 | static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type, |
ee01d542 AB |
318 | struct nft_set *set) |
319 | { | |
320 | struct nft_trans *trans; | |
321 | ||
322 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); | |
323 | if (trans == NULL) | |
324 | return -ENOMEM; | |
325 | ||
326 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { | |
327 | nft_trans_set_id(trans) = | |
328 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); | |
37a9cc52 | 329 | nft_activate_next(ctx->net, set); |
ee01d542 AB |
330 | } |
331 | nft_trans_set(trans) = set; | |
332 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
cd5125d8 | 337 | static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set) |
ee01d542 AB |
338 | { |
339 | int err; | |
340 | ||
341 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); | |
342 | if (err < 0) | |
343 | return err; | |
344 | ||
37a9cc52 | 345 | nft_deactivate_next(ctx->net, set); |
ee01d542 AB |
346 | ctx->table->use--; |
347 | ||
348 | return err; | |
349 | } | |
350 | ||
e5009240 PNA |
351 | static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type, |
352 | struct nft_object *obj) | |
353 | { | |
354 | struct nft_trans *trans; | |
355 | ||
356 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj)); | |
357 | if (trans == NULL) | |
358 | return -ENOMEM; | |
359 | ||
360 | if (msg_type == NFT_MSG_NEWOBJ) | |
361 | nft_activate_next(ctx->net, obj); | |
362 | ||
363 | nft_trans_obj(trans) = obj; | |
364 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj) | |
370 | { | |
371 | int err; | |
372 | ||
373 | err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj); | |
374 | if (err < 0) | |
375 | return err; | |
376 | ||
377 | nft_deactivate_next(ctx->net, obj); | |
378 | ctx->table->use--; | |
379 | ||
380 | return err; | |
381 | } | |
382 | ||
3b49e2e9 PNA |
383 | static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type, |
384 | struct nft_flowtable *flowtable) | |
385 | { | |
386 | struct nft_trans *trans; | |
387 | ||
388 | trans = nft_trans_alloc(ctx, msg_type, | |
389 | sizeof(struct nft_trans_flowtable)); | |
390 | if (trans == NULL) | |
391 | return -ENOMEM; | |
392 | ||
393 | if (msg_type == NFT_MSG_NEWFLOWTABLE) | |
394 | nft_activate_next(ctx->net, flowtable); | |
395 | ||
396 | nft_trans_flowtable(trans) = flowtable; | |
397 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | static int nft_delflowtable(struct nft_ctx *ctx, | |
403 | struct nft_flowtable *flowtable) | |
404 | { | |
405 | int err; | |
406 | ||
407 | err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable); | |
408 | if (err < 0) | |
409 | return err; | |
410 | ||
411 | nft_deactivate_next(ctx->net, flowtable); | |
412 | ctx->table->use--; | |
413 | ||
414 | return err; | |
415 | } | |
416 | ||
96518518 PM |
417 | /* |
418 | * Tables | |
419 | */ | |
420 | ||
36596dad | 421 | static struct nft_table *nft_table_lookup(const struct net *net, |
f2a6d766 | 422 | const struct nlattr *nla, |
36596dad | 423 | u8 family, u8 genmask) |
96518518 PM |
424 | { |
425 | struct nft_table *table; | |
426 | ||
cac20fcd PNA |
427 | if (nla == NULL) |
428 | return ERR_PTR(-EINVAL); | |
429 | ||
d9adf22a | 430 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
f2a6d766 | 431 | if (!nla_strcmp(nla, table->name) && |
98319cb9 | 432 | table->family == family && |
f2a6d766 | 433 | nft_active_genmask(table, genmask)) |
96518518 PM |
434 | return table; |
435 | } | |
cac20fcd PNA |
436 | |
437 | return ERR_PTR(-ENOENT); | |
96518518 PM |
438 | } |
439 | ||
3ecbfd65 HS |
440 | static struct nft_table *nft_table_lookup_byhandle(const struct net *net, |
441 | const struct nlattr *nla, | |
442 | u8 genmask) | |
443 | { | |
444 | struct nft_table *table; | |
445 | ||
446 | list_for_each_entry(table, &net->nft.tables, list) { | |
447 | if (be64_to_cpu(nla_get_be64(nla)) == table->handle && | |
448 | nft_active_genmask(table, genmask)) | |
449 | return table; | |
450 | } | |
3ecbfd65 HS |
451 | |
452 | return ERR_PTR(-ENOENT); | |
453 | } | |
454 | ||
96518518 PM |
455 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) |
456 | { | |
457 | return ++table->hgenerator; | |
458 | } | |
459 | ||
32537e91 | 460 | static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX]; |
9370761c | 461 | |
32537e91 | 462 | static const struct nft_chain_type * |
1ea26cca | 463 | __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family) |
9370761c PNA |
464 | { |
465 | int i; | |
466 | ||
baae3e62 | 467 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
468 | if (chain_type[family][i] != NULL && |
469 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 470 | return chain_type[family][i]; |
9370761c | 471 | } |
baae3e62 | 472 | return NULL; |
9370761c PNA |
473 | } |
474 | ||
452238e8 FW |
475 | /* |
476 | * Loading a module requires dropping mutex that guards the | |
477 | * transaction. | |
478 | * We first need to abort any pending transactions as once | |
479 | * mutex is unlocked a different client could start a new | |
480 | * transaction. It must not see any 'future generation' | |
481 | * changes * as these changes will never happen. | |
482 | */ | |
483 | #ifdef CONFIG_MODULES | |
484 | static int __nf_tables_abort(struct net *net); | |
485 | ||
486 | static void nft_request_module(struct net *net, const char *fmt, ...) | |
487 | { | |
488 | char module_name[MODULE_NAME_LEN]; | |
489 | va_list args; | |
490 | int ret; | |
491 | ||
492 | __nf_tables_abort(net); | |
493 | ||
494 | va_start(args, fmt); | |
495 | ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args); | |
496 | va_end(args); | |
497 | if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret)) | |
498 | return; | |
499 | ||
f102d66b | 500 | mutex_unlock(&net->nft.commit_mutex); |
452238e8 | 501 | request_module("%s", module_name); |
f102d66b | 502 | mutex_lock(&net->nft.commit_mutex); |
452238e8 FW |
503 | } |
504 | #endif | |
505 | ||
f102d66b FW |
506 | static void lockdep_nfnl_nft_mutex_not_held(void) |
507 | { | |
508 | #ifdef CONFIG_PROVE_LOCKING | |
509 | WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES)); | |
510 | #endif | |
511 | } | |
512 | ||
32537e91 | 513 | static const struct nft_chain_type * |
452238e8 FW |
514 | nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla, |
515 | u8 family, bool autoload) | |
9370761c | 516 | { |
32537e91 | 517 | const struct nft_chain_type *type; |
9370761c | 518 | |
1ea26cca | 519 | type = __nf_tables_chain_type_lookup(nla, family); |
93b0806f PM |
520 | if (type != NULL) |
521 | return type; | |
f102d66b FW |
522 | |
523 | lockdep_nfnl_nft_mutex_not_held(); | |
9370761c | 524 | #ifdef CONFIG_MODULES |
93b0806f | 525 | if (autoload) { |
452238e8 FW |
526 | nft_request_module(net, "nft-chain-%u-%.*s", family, |
527 | nla_len(nla), (const char *)nla_data(nla)); | |
1ea26cca | 528 | type = __nf_tables_chain_type_lookup(nla, family); |
93b0806f PM |
529 | if (type != NULL) |
530 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
531 | } |
532 | #endif | |
93b0806f | 533 | return ERR_PTR(-ENOENT); |
9370761c PNA |
534 | } |
535 | ||
96518518 | 536 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
1cae565e PNA |
537 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
538 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
9ddf6323 | 539 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
3ecbfd65 | 540 | [NFTA_TABLE_HANDLE] = { .type = NLA_U64 }, |
96518518 PM |
541 | }; |
542 | ||
84d7fce6 PNA |
543 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
544 | u32 portid, u32 seq, int event, u32 flags, | |
545 | int family, const struct nft_table *table) | |
96518518 PM |
546 | { |
547 | struct nlmsghdr *nlh; | |
548 | struct nfgenmsg *nfmsg; | |
549 | ||
dedb67c4 | 550 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
551 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
552 | if (nlh == NULL) | |
553 | goto nla_put_failure; | |
554 | ||
555 | nfmsg = nlmsg_data(nlh); | |
556 | nfmsg->nfgen_family = family; | |
557 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 558 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 | 559 | |
9ddf6323 | 560 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 | 561 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
3ecbfd65 HS |
562 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) || |
563 | nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle), | |
564 | NFTA_TABLE_PAD)) | |
96518518 PM |
565 | goto nla_put_failure; |
566 | ||
053c095a JB |
567 | nlmsg_end(skb, nlh); |
568 | return 0; | |
96518518 PM |
569 | |
570 | nla_put_failure: | |
571 | nlmsg_trim(skb, nlh); | |
572 | return -1; | |
573 | } | |
574 | ||
25e94a99 | 575 | static void nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
576 | { |
577 | struct sk_buff *skb; | |
96518518 PM |
578 | int err; |
579 | ||
128ad332 PNA |
580 | if (!ctx->report && |
581 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 582 | return; |
96518518 | 583 | |
96518518 PM |
584 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
585 | if (skb == NULL) | |
586 | goto err; | |
587 | ||
84d7fce6 | 588 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 589 | event, 0, ctx->family, ctx->table); |
96518518 PM |
590 | if (err < 0) { |
591 | kfree_skb(skb); | |
592 | goto err; | |
593 | } | |
594 | ||
25e94a99 PNA |
595 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
596 | ctx->report, GFP_KERNEL); | |
597 | return; | |
96518518 | 598 | err: |
25e94a99 | 599 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
600 | } |
601 | ||
602 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
603 | struct netlink_callback *cb) | |
604 | { | |
605 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
96518518 PM |
606 | const struct nft_table *table; |
607 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 608 | struct net *net = sock_net(skb->sk); |
96518518 PM |
609 | int family = nfmsg->nfgen_family; |
610 | ||
e688a7f8 | 611 | rcu_read_lock(); |
38e029f1 PNA |
612 | cb->seq = net->nft.base_seq; |
613 | ||
36596dad | 614 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 615 | if (family != NFPROTO_UNSPEC && family != table->family) |
96518518 PM |
616 | continue; |
617 | ||
36596dad PNA |
618 | if (idx < s_idx) |
619 | goto cont; | |
620 | if (idx > s_idx) | |
621 | memset(&cb->args[1], 0, | |
622 | sizeof(cb->args) - sizeof(cb->args[0])); | |
623 | if (!nft_is_active(net, table)) | |
624 | continue; | |
625 | if (nf_tables_fill_table_info(skb, net, | |
626 | NETLINK_CB(cb->skb).portid, | |
627 | cb->nlh->nlmsg_seq, | |
628 | NFT_MSG_NEWTABLE, NLM_F_MULTI, | |
98319cb9 | 629 | table->family, table) < 0) |
36596dad PNA |
630 | goto done; |
631 | ||
632 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 | 633 | cont: |
36596dad | 634 | idx++; |
96518518 PM |
635 | } |
636 | done: | |
e688a7f8 | 637 | rcu_read_unlock(); |
96518518 PM |
638 | cb->args[0] = idx; |
639 | return skb->len; | |
640 | } | |
641 | ||
d9adf22a FW |
642 | static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb, |
643 | const struct nlmsghdr *nlh, | |
644 | struct netlink_dump_control *c) | |
645 | { | |
646 | int err; | |
647 | ||
648 | if (!try_module_get(THIS_MODULE)) | |
649 | return -EINVAL; | |
650 | ||
651 | rcu_read_unlock(); | |
652 | err = netlink_dump_start(nlsk, skb, nlh, c); | |
653 | rcu_read_lock(); | |
654 | module_put(THIS_MODULE); | |
655 | ||
656 | return err; | |
657 | } | |
658 | ||
659 | /* called with rcu_read_lock held */ | |
7b8002a1 PNA |
660 | static int nf_tables_gettable(struct net *net, struct sock *nlsk, |
661 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
662 | const struct nlattr * const nla[], |
663 | struct netlink_ext_ack *extack) | |
96518518 PM |
664 | { |
665 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 666 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
667 | const struct nft_table *table; |
668 | struct sk_buff *skb2; | |
669 | int family = nfmsg->nfgen_family; | |
670 | int err; | |
671 | ||
672 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
673 | struct netlink_dump_control c = { | |
674 | .dump = nf_tables_dump_tables, | |
d9adf22a | 675 | .module = THIS_MODULE, |
96518518 | 676 | }; |
d9adf22a FW |
677 | |
678 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); | |
96518518 PM |
679 | } |
680 | ||
cac20fcd | 681 | table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask); |
36dd1bcc PNA |
682 | if (IS_ERR(table)) { |
683 | NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]); | |
96518518 | 684 | return PTR_ERR(table); |
36dd1bcc | 685 | } |
96518518 | 686 | |
d9adf22a | 687 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
96518518 PM |
688 | if (!skb2) |
689 | return -ENOMEM; | |
690 | ||
84d7fce6 | 691 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
692 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
693 | family, table); | |
694 | if (err < 0) | |
695 | goto err; | |
696 | ||
697 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
698 | ||
699 | err: | |
700 | kfree_skb(skb2); | |
701 | return err; | |
702 | } | |
703 | ||
c9c17211 | 704 | static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt) |
10435c11 F |
705 | { |
706 | struct nft_chain *chain; | |
707 | u32 i = 0; | |
708 | ||
709 | list_for_each_entry(chain, &table->chains, list) { | |
710 | if (!nft_is_active_next(net, chain)) | |
711 | continue; | |
f323d954 | 712 | if (!nft_is_base_chain(chain)) |
10435c11 F |
713 | continue; |
714 | ||
715 | if (cnt && i++ == cnt) | |
716 | break; | |
717 | ||
c974a3a3 | 718 | nf_unregister_net_hook(net, &nft_base_chain(chain)->ops); |
10435c11 F |
719 | } |
720 | } | |
721 | ||
c9c17211 | 722 | static int nf_tables_table_enable(struct net *net, struct nft_table *table) |
9ddf6323 PNA |
723 | { |
724 | struct nft_chain *chain; | |
725 | int err, i = 0; | |
726 | ||
727 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
728 | if (!nft_is_active_next(net, chain)) |
729 | continue; | |
f323d954 | 730 | if (!nft_is_base_chain(chain)) |
d2012975 PNA |
731 | continue; |
732 | ||
c974a3a3 | 733 | err = nf_register_net_hook(net, &nft_base_chain(chain)->ops); |
9ddf6323 PNA |
734 | if (err < 0) |
735 | goto err; | |
736 | ||
737 | i++; | |
738 | } | |
739 | return 0; | |
740 | err: | |
10435c11 | 741 | if (i) |
c9c17211 | 742 | nft_table_disable(net, table, i); |
9ddf6323 PNA |
743 | return err; |
744 | } | |
745 | ||
c9c17211 | 746 | static void nf_tables_table_disable(struct net *net, struct nft_table *table) |
9ddf6323 | 747 | { |
c9c17211 | 748 | nft_table_disable(net, table, 0); |
9ddf6323 PNA |
749 | } |
750 | ||
e1aaca93 | 751 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 752 | { |
55dd6f93 | 753 | struct nft_trans *trans; |
e1aaca93 | 754 | u32 flags; |
55dd6f93 | 755 | int ret = 0; |
9ddf6323 | 756 | |
e1aaca93 PNA |
757 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
758 | return 0; | |
9ddf6323 | 759 | |
e1aaca93 PNA |
760 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
761 | if (flags & ~NFT_TABLE_F_DORMANT) | |
762 | return -EINVAL; | |
763 | ||
63283dd2 PNA |
764 | if (flags == ctx->table->flags) |
765 | return 0; | |
766 | ||
55dd6f93 PNA |
767 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
768 | sizeof(struct nft_trans_table)); | |
769 | if (trans == NULL) | |
770 | return -ENOMEM; | |
9ddf6323 | 771 | |
e1aaca93 PNA |
772 | if ((flags & NFT_TABLE_F_DORMANT) && |
773 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 774 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
775 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
776 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
c9c17211 | 777 | ret = nf_tables_table_enable(ctx->net, ctx->table); |
55dd6f93 | 778 | if (ret >= 0) { |
e1aaca93 | 779 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 780 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 781 | } |
9ddf6323 | 782 | } |
e1aaca93 PNA |
783 | if (ret < 0) |
784 | goto err; | |
9ddf6323 | 785 | |
55dd6f93 PNA |
786 | nft_trans_table_update(trans) = true; |
787 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
788 | return 0; | |
9ddf6323 | 789 | err: |
55dd6f93 | 790 | nft_trans_destroy(trans); |
9ddf6323 PNA |
791 | return ret; |
792 | } | |
793 | ||
1b2470e5 FW |
794 | static u32 nft_chain_hash(const void *data, u32 len, u32 seed) |
795 | { | |
796 | const char *name = data; | |
797 | ||
798 | return jhash(name, strlen(name), seed); | |
799 | } | |
800 | ||
801 | static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed) | |
802 | { | |
803 | const struct nft_chain *chain = data; | |
804 | ||
805 | return nft_chain_hash(chain->name, 0, seed); | |
806 | } | |
807 | ||
808 | static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg, | |
809 | const void *ptr) | |
810 | { | |
811 | const struct nft_chain *chain = ptr; | |
812 | const char *name = arg->key; | |
813 | ||
814 | return strcmp(chain->name, name); | |
815 | } | |
816 | ||
633c9a84 PNA |
817 | static int nf_tables_newtable(struct net *net, struct sock *nlsk, |
818 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
819 | const struct nlattr * const nla[], |
820 | struct netlink_ext_ack *extack) | |
96518518 PM |
821 | { |
822 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 823 | u8 genmask = nft_genmask_next(net); |
96518518 | 824 | int family = nfmsg->nfgen_family; |
36dd1bcc PNA |
825 | const struct nlattr *attr; |
826 | struct nft_table *table; | |
c5c1f975 | 827 | u32 flags = 0; |
e1aaca93 | 828 | struct nft_ctx ctx; |
55dd6f93 | 829 | int err; |
96518518 | 830 | |
f102d66b | 831 | lockdep_assert_held(&net->nft.commit_mutex); |
36dd1bcc PNA |
832 | attr = nla[NFTA_TABLE_NAME]; |
833 | table = nft_table_lookup(net, attr, family, genmask); | |
96518518 PM |
834 | if (IS_ERR(table)) { |
835 | if (PTR_ERR(table) != -ENOENT) | |
836 | return PTR_ERR(table); | |
1a28ad74 | 837 | } else { |
36dd1bcc PNA |
838 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
839 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 840 | return -EEXIST; |
36dd1bcc | 841 | } |
96518518 PM |
842 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
843 | return -EOPNOTSUPP; | |
e1aaca93 | 844 | |
98319cb9 | 845 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e1aaca93 | 846 | return nf_tables_updtable(&ctx); |
96518518 PM |
847 | } |
848 | ||
c5c1f975 PM |
849 | if (nla[NFTA_TABLE_FLAGS]) { |
850 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
851 | if (flags & ~NFT_TABLE_F_DORMANT) | |
852 | return -EINVAL; | |
853 | } | |
854 | ||
ffdb210e | 855 | err = -ENOMEM; |
1cae565e | 856 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
ffdb210e | 857 | if (table == NULL) |
98319cb9 | 858 | goto err_kzalloc; |
96518518 | 859 | |
36dd1bcc | 860 | table->name = nla_strdup(attr, GFP_KERNEL); |
e46abbcc | 861 | if (table->name == NULL) |
98319cb9 | 862 | goto err_strdup; |
e46abbcc | 863 | |
1b2470e5 FW |
864 | err = rhltable_init(&table->chains_ht, &nft_chain_ht_params); |
865 | if (err) | |
866 | goto err_chain_ht; | |
867 | ||
96518518 | 868 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 869 | INIT_LIST_HEAD(&table->sets); |
e5009240 | 870 | INIT_LIST_HEAD(&table->objects); |
3b49e2e9 | 871 | INIT_LIST_HEAD(&table->flowtables); |
98319cb9 | 872 | table->family = family; |
c5c1f975 | 873 | table->flags = flags; |
3ecbfd65 | 874 | table->handle = ++table_handle; |
9ddf6323 | 875 | |
98319cb9 | 876 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
55dd6f93 | 877 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
ffdb210e | 878 | if (err < 0) |
98319cb9 | 879 | goto err_trans; |
ffdb210e | 880 | |
36596dad | 881 | list_add_tail_rcu(&table->list, &net->nft.tables); |
96518518 | 882 | return 0; |
98319cb9 | 883 | err_trans: |
1b2470e5 FW |
884 | rhltable_destroy(&table->chains_ht); |
885 | err_chain_ht: | |
e46abbcc | 886 | kfree(table->name); |
98319cb9 | 887 | err_strdup: |
ffdb210e | 888 | kfree(table); |
98319cb9 | 889 | err_kzalloc: |
ffdb210e | 890 | return err; |
96518518 PM |
891 | } |
892 | ||
b9ac12ef AB |
893 | static int nft_flush_table(struct nft_ctx *ctx) |
894 | { | |
3b49e2e9 | 895 | struct nft_flowtable *flowtable, *nft; |
b9ac12ef | 896 | struct nft_chain *chain, *nc; |
e5009240 | 897 | struct nft_object *obj, *ne; |
b9ac12ef | 898 | struct nft_set *set, *ns; |
3b49e2e9 | 899 | int err; |
b9ac12ef | 900 | |
a2f18db0 | 901 | list_for_each_entry(chain, &ctx->table->chains, list) { |
664b0f8c PNA |
902 | if (!nft_is_active_next(ctx->net, chain)) |
903 | continue; | |
904 | ||
b9ac12ef AB |
905 | ctx->chain = chain; |
906 | ||
907 | err = nft_delrule_by_chain(ctx); | |
908 | if (err < 0) | |
909 | goto out; | |
b9ac12ef AB |
910 | } |
911 | ||
912 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
37a9cc52 PNA |
913 | if (!nft_is_active_next(ctx->net, set)) |
914 | continue; | |
915 | ||
408070d6 | 916 | if (nft_set_is_anonymous(set) && |
b9ac12ef AB |
917 | !list_empty(&set->bindings)) |
918 | continue; | |
919 | ||
920 | err = nft_delset(ctx, set); | |
921 | if (err < 0) | |
922 | goto out; | |
923 | } | |
924 | ||
3b49e2e9 PNA |
925 | list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) { |
926 | err = nft_delflowtable(ctx, flowtable); | |
927 | if (err < 0) | |
928 | goto out; | |
929 | } | |
930 | ||
e5009240 PNA |
931 | list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { |
932 | err = nft_delobj(ctx, obj); | |
933 | if (err < 0) | |
934 | goto out; | |
935 | } | |
936 | ||
a2f18db0 | 937 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
664b0f8c PNA |
938 | if (!nft_is_active_next(ctx->net, chain)) |
939 | continue; | |
940 | ||
a2f18db0 PNA |
941 | ctx->chain = chain; |
942 | ||
943 | err = nft_delchain(ctx); | |
944 | if (err < 0) | |
945 | goto out; | |
946 | } | |
947 | ||
b9ac12ef AB |
948 | err = nft_deltable(ctx); |
949 | out: | |
950 | return err; | |
951 | } | |
952 | ||
953 | static int nft_flush(struct nft_ctx *ctx, int family) | |
954 | { | |
b9ac12ef AB |
955 | struct nft_table *table, *nt; |
956 | const struct nlattr * const *nla = ctx->nla; | |
957 | int err = 0; | |
958 | ||
36596dad | 959 | list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) { |
98319cb9 | 960 | if (family != AF_UNSPEC && table->family != family) |
b9ac12ef AB |
961 | continue; |
962 | ||
98319cb9 | 963 | ctx->family = table->family; |
f2a6d766 | 964 | |
36596dad PNA |
965 | if (!nft_is_active_next(ctx->net, table)) |
966 | continue; | |
b9ac12ef | 967 | |
36596dad PNA |
968 | if (nla[NFTA_TABLE_NAME] && |
969 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
970 | continue; | |
b9ac12ef | 971 | |
36596dad PNA |
972 | ctx->table = table; |
973 | ||
974 | err = nft_flush_table(ctx); | |
975 | if (err < 0) | |
976 | goto out; | |
b9ac12ef AB |
977 | } |
978 | out: | |
979 | return err; | |
980 | } | |
981 | ||
633c9a84 PNA |
982 | static int nf_tables_deltable(struct net *net, struct sock *nlsk, |
983 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
984 | const struct nlattr * const nla[], |
985 | struct netlink_ext_ack *extack) | |
96518518 PM |
986 | { |
987 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 988 | u8 genmask = nft_genmask_next(net); |
ee01d542 | 989 | int family = nfmsg->nfgen_family; |
36dd1bcc PNA |
990 | const struct nlattr *attr; |
991 | struct nft_table *table; | |
55dd6f93 | 992 | struct nft_ctx ctx; |
96518518 | 993 | |
36596dad | 994 | nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla); |
3ecbfd65 HS |
995 | if (family == AF_UNSPEC || |
996 | (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE])) | |
b9ac12ef AB |
997 | return nft_flush(&ctx, family); |
998 | ||
36dd1bcc PNA |
999 | if (nla[NFTA_TABLE_HANDLE]) { |
1000 | attr = nla[NFTA_TABLE_HANDLE]; | |
1001 | table = nft_table_lookup_byhandle(net, attr, genmask); | |
1002 | } else { | |
1003 | attr = nla[NFTA_TABLE_NAME]; | |
1004 | table = nft_table_lookup(net, attr, family, genmask); | |
1005 | } | |
3ecbfd65 | 1006 | |
36dd1bcc PNA |
1007 | if (IS_ERR(table)) { |
1008 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 1009 | return PTR_ERR(table); |
36dd1bcc | 1010 | } |
96518518 | 1011 | |
a8278400 PNA |
1012 | if (nlh->nlmsg_flags & NLM_F_NONREC && |
1013 | table->use > 0) | |
1014 | return -EBUSY; | |
1015 | ||
98319cb9 | 1016 | ctx.family = family; |
b9ac12ef | 1017 | ctx.table = table; |
55dd6f93 | 1018 | |
b9ac12ef | 1019 | return nft_flush_table(&ctx); |
96518518 PM |
1020 | } |
1021 | ||
55dd6f93 PNA |
1022 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
1023 | { | |
fa5950e4 FW |
1024 | if (WARN_ON(ctx->table->use > 0)) |
1025 | return; | |
4fefee57 | 1026 | |
1b2470e5 | 1027 | rhltable_destroy(&ctx->table->chains_ht); |
e46abbcc | 1028 | kfree(ctx->table->name); |
55dd6f93 | 1029 | kfree(ctx->table); |
55dd6f93 PNA |
1030 | } |
1031 | ||
cc07eeb0 | 1032 | void nft_register_chain_type(const struct nft_chain_type *ctype) |
96518518 | 1033 | { |
d8297d4f | 1034 | if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO)) |
cc07eeb0 | 1035 | return; |
d8297d4f | 1036 | |
96518518 | 1037 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
cc07eeb0 PNA |
1038 | if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) { |
1039 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1040 | return; | |
96518518 | 1041 | } |
9370761c | 1042 | chain_type[ctype->family][ctype->type] = ctype; |
96518518 | 1043 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
96518518 | 1044 | } |
9370761c | 1045 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 1046 | |
32537e91 | 1047 | void nft_unregister_chain_type(const struct nft_chain_type *ctype) |
96518518 | 1048 | { |
96518518 | 1049 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 1050 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
1051 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1052 | } | |
9370761c | 1053 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
1054 | |
1055 | /* | |
1056 | * Chains | |
1057 | */ | |
1058 | ||
1059 | static struct nft_chain * | |
cac20fcd | 1060 | nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask) |
96518518 PM |
1061 | { |
1062 | struct nft_chain *chain; | |
1063 | ||
1064 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
1065 | if (chain->handle == handle && |
1066 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
1067 | return chain; |
1068 | } | |
1069 | ||
1070 | return ERR_PTR(-ENOENT); | |
1071 | } | |
1072 | ||
f102d66b FW |
1073 | static bool lockdep_commit_lock_is_held(struct net *net) |
1074 | { | |
1075 | #ifdef CONFIG_PROVE_LOCKING | |
1076 | return lockdep_is_held(&net->nft.commit_mutex); | |
1077 | #else | |
1078 | return true; | |
1079 | #endif | |
1080 | } | |
1081 | ||
1082 | static struct nft_chain *nft_chain_lookup(struct net *net, | |
1083 | struct nft_table *table, | |
cac20fcd | 1084 | const struct nlattr *nla, u8 genmask) |
96518518 | 1085 | { |
1b2470e5 FW |
1086 | char search[NFT_CHAIN_MAXNAMELEN + 1]; |
1087 | struct rhlist_head *tmp, *list; | |
96518518 PM |
1088 | struct nft_chain *chain; |
1089 | ||
1090 | if (nla == NULL) | |
1091 | return ERR_PTR(-EINVAL); | |
1092 | ||
1b2470e5 | 1093 | nla_strlcpy(search, nla, sizeof(search)); |
96518518 | 1094 | |
1b2470e5 | 1095 | WARN_ON(!rcu_read_lock_held() && |
f102d66b | 1096 | !lockdep_commit_lock_is_held(net)); |
1b2470e5 FW |
1097 | |
1098 | chain = ERR_PTR(-ENOENT); | |
1099 | rcu_read_lock(); | |
1100 | list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params); | |
1101 | if (!list) | |
1102 | goto out_unlock; | |
1103 | ||
1104 | rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) { | |
1105 | if (nft_active_genmask(chain, genmask)) | |
1106 | goto out_unlock; | |
1107 | } | |
1108 | chain = ERR_PTR(-ENOENT); | |
1109 | out_unlock: | |
1110 | rcu_read_unlock(); | |
1111 | return chain; | |
96518518 PM |
1112 | } |
1113 | ||
1114 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
b2fbd044 LZ |
1115 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, |
1116 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
1117 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
1118 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
1119 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1120 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 1121 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 1122 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 1123 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
1124 | }; |
1125 | ||
1126 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
1127 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
1128 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
2cbce139 PNA |
1129 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
1130 | .len = IFNAMSIZ - 1 }, | |
96518518 PM |
1131 | }; |
1132 | ||
0ca743a5 PNA |
1133 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
1134 | { | |
1135 | struct nft_stats *cpu_stats, total; | |
1136 | struct nlattr *nest; | |
ce355e20 ED |
1137 | unsigned int seq; |
1138 | u64 pkts, bytes; | |
0ca743a5 PNA |
1139 | int cpu; |
1140 | ||
1141 | memset(&total, 0, sizeof(total)); | |
1142 | for_each_possible_cpu(cpu) { | |
1143 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
1144 | do { |
1145 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
1146 | pkts = cpu_stats->pkts; | |
1147 | bytes = cpu_stats->bytes; | |
1148 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
1149 | total.pkts += pkts; | |
1150 | total.bytes += bytes; | |
0ca743a5 PNA |
1151 | } |
1152 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
1153 | if (nest == NULL) | |
1154 | goto nla_put_failure; | |
1155 | ||
b46f6ded ND |
1156 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), |
1157 | NFTA_COUNTER_PAD) || | |
1158 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), | |
1159 | NFTA_COUNTER_PAD)) | |
0ca743a5 PNA |
1160 | goto nla_put_failure; |
1161 | ||
1162 | nla_nest_end(skb, nest); | |
1163 | return 0; | |
1164 | ||
1165 | nla_put_failure: | |
1166 | return -ENOSPC; | |
1167 | } | |
1168 | ||
84d7fce6 PNA |
1169 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
1170 | u32 portid, u32 seq, int event, u32 flags, | |
1171 | int family, const struct nft_table *table, | |
96518518 PM |
1172 | const struct nft_chain *chain) |
1173 | { | |
1174 | struct nlmsghdr *nlh; | |
1175 | struct nfgenmsg *nfmsg; | |
1176 | ||
dedb67c4 | 1177 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
1178 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
1179 | if (nlh == NULL) | |
1180 | goto nla_put_failure; | |
1181 | ||
1182 | nfmsg = nlmsg_data(nlh); | |
1183 | nfmsg->nfgen_family = family; | |
1184 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1185 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1186 | |
1187 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
1188 | goto nla_put_failure; | |
b46f6ded ND |
1189 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), |
1190 | NFTA_CHAIN_PAD)) | |
96518518 PM |
1191 | goto nla_put_failure; |
1192 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
1193 | goto nla_put_failure; | |
1194 | ||
f323d954 | 1195 | if (nft_is_base_chain(chain)) { |
0ca743a5 | 1196 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
c974a3a3 | 1197 | const struct nf_hook_ops *ops = &basechain->ops; |
0ca743a5 PNA |
1198 | struct nlattr *nest; |
1199 | ||
1200 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
1201 | if (nest == NULL) |
1202 | goto nla_put_failure; | |
1203 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
1204 | goto nla_put_failure; | |
1205 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
1206 | goto nla_put_failure; | |
2cbce139 PNA |
1207 | if (basechain->dev_name[0] && |
1208 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) | |
1209 | goto nla_put_failure; | |
96518518 | 1210 | nla_nest_end(skb, nest); |
9370761c | 1211 | |
0ca743a5 PNA |
1212 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
1213 | htonl(basechain->policy))) | |
1214 | goto nla_put_failure; | |
1215 | ||
baae3e62 PM |
1216 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
1217 | goto nla_put_failure; | |
0ca743a5 | 1218 | |
4c05ec47 TY |
1219 | if (rcu_access_pointer(basechain->stats) && |
1220 | nft_dump_stats(skb, rcu_dereference(basechain->stats))) | |
0ca743a5 | 1221 | goto nla_put_failure; |
96518518 PM |
1222 | } |
1223 | ||
0ca743a5 PNA |
1224 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
1225 | goto nla_put_failure; | |
1226 | ||
053c095a JB |
1227 | nlmsg_end(skb, nlh); |
1228 | return 0; | |
96518518 PM |
1229 | |
1230 | nla_put_failure: | |
1231 | nlmsg_trim(skb, nlh); | |
1232 | return -1; | |
1233 | } | |
1234 | ||
25e94a99 | 1235 | static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
1236 | { |
1237 | struct sk_buff *skb; | |
96518518 PM |
1238 | int err; |
1239 | ||
128ad332 PNA |
1240 | if (!ctx->report && |
1241 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 1242 | return; |
96518518 | 1243 | |
96518518 PM |
1244 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1245 | if (skb == NULL) | |
1246 | goto err; | |
1247 | ||
84d7fce6 | 1248 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 1249 | event, 0, ctx->family, ctx->table, |
35151d84 | 1250 | ctx->chain); |
96518518 PM |
1251 | if (err < 0) { |
1252 | kfree_skb(skb); | |
1253 | goto err; | |
1254 | } | |
1255 | ||
25e94a99 PNA |
1256 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1257 | ctx->report, GFP_KERNEL); | |
1258 | return; | |
96518518 | 1259 | err: |
25e94a99 | 1260 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
1261 | } |
1262 | ||
1263 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1264 | struct netlink_callback *cb) | |
1265 | { | |
1266 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
96518518 PM |
1267 | const struct nft_table *table; |
1268 | const struct nft_chain *chain; | |
1269 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1270 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1271 | int family = nfmsg->nfgen_family; |
1272 | ||
e688a7f8 | 1273 | rcu_read_lock(); |
38e029f1 PNA |
1274 | cb->seq = net->nft.base_seq; |
1275 | ||
36596dad | 1276 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 1277 | if (family != NFPROTO_UNSPEC && family != table->family) |
96518518 PM |
1278 | continue; |
1279 | ||
36596dad PNA |
1280 | list_for_each_entry_rcu(chain, &table->chains, list) { |
1281 | if (idx < s_idx) | |
1282 | goto cont; | |
1283 | if (idx > s_idx) | |
1284 | memset(&cb->args[1], 0, | |
1285 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1286 | if (!nft_is_active(net, chain)) | |
1287 | continue; | |
1288 | if (nf_tables_fill_chain_info(skb, net, | |
1289 | NETLINK_CB(cb->skb).portid, | |
1290 | cb->nlh->nlmsg_seq, | |
1291 | NFT_MSG_NEWCHAIN, | |
1292 | NLM_F_MULTI, | |
98319cb9 | 1293 | table->family, table, |
36596dad PNA |
1294 | chain) < 0) |
1295 | goto done; | |
38e029f1 | 1296 | |
36596dad | 1297 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
96518518 | 1298 | cont: |
36596dad | 1299 | idx++; |
96518518 PM |
1300 | } |
1301 | } | |
1302 | done: | |
e688a7f8 | 1303 | rcu_read_unlock(); |
96518518 PM |
1304 | cb->args[0] = idx; |
1305 | return skb->len; | |
1306 | } | |
1307 | ||
d9adf22a | 1308 | /* called with rcu_read_lock held */ |
7b8002a1 PNA |
1309 | static int nf_tables_getchain(struct net *net, struct sock *nlsk, |
1310 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1311 | const struct nlattr * const nla[], |
1312 | struct netlink_ext_ack *extack) | |
96518518 PM |
1313 | { |
1314 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1315 | u8 genmask = nft_genmask_cur(net); |
96518518 | 1316 | const struct nft_chain *chain; |
1b2470e5 | 1317 | struct nft_table *table; |
96518518 PM |
1318 | struct sk_buff *skb2; |
1319 | int family = nfmsg->nfgen_family; | |
1320 | int err; | |
1321 | ||
1322 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1323 | struct netlink_dump_control c = { | |
1324 | .dump = nf_tables_dump_chains, | |
d9adf22a | 1325 | .module = THIS_MODULE, |
96518518 | 1326 | }; |
d9adf22a FW |
1327 | |
1328 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); | |
96518518 PM |
1329 | } |
1330 | ||
cac20fcd | 1331 | table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask); |
36dd1bcc PNA |
1332 | if (IS_ERR(table)) { |
1333 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); | |
96518518 | 1334 | return PTR_ERR(table); |
36dd1bcc | 1335 | } |
96518518 | 1336 | |
f102d66b | 1337 | chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask); |
36dd1bcc PNA |
1338 | if (IS_ERR(chain)) { |
1339 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); | |
96518518 | 1340 | return PTR_ERR(chain); |
36dd1bcc | 1341 | } |
96518518 | 1342 | |
d9adf22a | 1343 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
96518518 PM |
1344 | if (!skb2) |
1345 | return -ENOMEM; | |
1346 | ||
84d7fce6 | 1347 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1348 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1349 | family, table, chain); | |
1350 | if (err < 0) | |
1351 | goto err; | |
1352 | ||
1353 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1354 | ||
1355 | err: | |
1356 | kfree_skb(skb2); | |
1357 | return err; | |
1358 | } | |
1359 | ||
0ca743a5 PNA |
1360 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1361 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1362 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1363 | }; | |
1364 | ||
ff3cd7b3 | 1365 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1366 | { |
1367 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1368 | struct nft_stats __percpu *newstats; | |
1369 | struct nft_stats *stats; | |
1370 | int err; | |
1371 | ||
fceb6435 JB |
1372 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy, |
1373 | NULL); | |
0ca743a5 | 1374 | if (err < 0) |
ff3cd7b3 | 1375 | return ERR_PTR(err); |
0ca743a5 PNA |
1376 | |
1377 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1378 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1379 | |
ce355e20 | 1380 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1381 | if (newstats == NULL) |
ff3cd7b3 | 1382 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1383 | |
1384 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1385 | * are not exposed to userspace. | |
1386 | */ | |
e8781f70 | 1387 | preempt_disable(); |
0ca743a5 PNA |
1388 | stats = this_cpu_ptr(newstats); |
1389 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1390 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1391 | preempt_enable(); |
0ca743a5 | 1392 | |
ff3cd7b3 PNA |
1393 | return newstats; |
1394 | } | |
1395 | ||
4c05ec47 TY |
1396 | static void nft_chain_stats_replace(struct net *net, |
1397 | struct nft_base_chain *chain, | |
ff3cd7b3 PNA |
1398 | struct nft_stats __percpu *newstats) |
1399 | { | |
0befd061 PNA |
1400 | struct nft_stats __percpu *oldstats; |
1401 | ||
b88825de PNA |
1402 | if (newstats == NULL) |
1403 | return; | |
1404 | ||
4c05ec47 TY |
1405 | if (rcu_access_pointer(chain->stats)) { |
1406 | oldstats = rcu_dereference_protected(chain->stats, | |
1407 | lockdep_commit_lock_is_held(net)); | |
0ca743a5 PNA |
1408 | rcu_assign_pointer(chain->stats, newstats); |
1409 | synchronize_rcu(); | |
1410 | free_percpu(oldstats); | |
bbb8c61f | 1411 | } else { |
0ca743a5 | 1412 | rcu_assign_pointer(chain->stats, newstats); |
bbb8c61f TY |
1413 | static_branch_inc(&nft_counters_enabled); |
1414 | } | |
0ca743a5 PNA |
1415 | } |
1416 | ||
0cbc06b3 FW |
1417 | static void nf_tables_chain_free_chain_rules(struct nft_chain *chain) |
1418 | { | |
1419 | struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0); | |
1420 | struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1); | |
1421 | ||
1422 | if (g0 != g1) | |
1423 | kvfree(g1); | |
1424 | kvfree(g0); | |
1425 | ||
1426 | /* should be NULL either via abort or via successful commit */ | |
1427 | WARN_ON_ONCE(chain->rules_next); | |
1428 | kvfree(chain->rules_next); | |
1429 | } | |
1430 | ||
43a605f2 | 1431 | static void nf_tables_chain_destroy(struct nft_ctx *ctx) |
91c7b38d | 1432 | { |
43a605f2 PNA |
1433 | struct nft_chain *chain = ctx->chain; |
1434 | ||
fa5950e4 FW |
1435 | if (WARN_ON(chain->use > 0)) |
1436 | return; | |
91c7b38d | 1437 | |
0cbc06b3 FW |
1438 | /* no concurrent access possible anymore */ |
1439 | nf_tables_chain_free_chain_rules(chain); | |
1440 | ||
f323d954 | 1441 | if (nft_is_base_chain(chain)) { |
2cbce139 PNA |
1442 | struct nft_base_chain *basechain = nft_base_chain(chain); |
1443 | ||
1444 | module_put(basechain->type->owner); | |
4c05ec47 | 1445 | if (rcu_access_pointer(basechain->stats)) { |
9f08ea84 | 1446 | static_branch_dec(&nft_counters_enabled); |
4c05ec47 TY |
1447 | free_percpu(rcu_dereference_raw(basechain->stats)); |
1448 | } | |
b7263e07 | 1449 | kfree(chain->name); |
2cbce139 | 1450 | kfree(basechain); |
91c7b38d | 1451 | } else { |
b7263e07 | 1452 | kfree(chain->name); |
91c7b38d PNA |
1453 | kfree(chain); |
1454 | } | |
1455 | } | |
1456 | ||
508f8ccd PNA |
1457 | struct nft_chain_hook { |
1458 | u32 num; | |
84ba7dd7 | 1459 | s32 priority; |
32537e91 | 1460 | const struct nft_chain_type *type; |
508f8ccd PNA |
1461 | struct net_device *dev; |
1462 | }; | |
1463 | ||
1464 | static int nft_chain_parse_hook(struct net *net, | |
1465 | const struct nlattr * const nla[], | |
36596dad | 1466 | struct nft_chain_hook *hook, u8 family, |
445509eb | 1467 | bool autoload) |
508f8ccd PNA |
1468 | { |
1469 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; | |
32537e91 | 1470 | const struct nft_chain_type *type; |
508f8ccd PNA |
1471 | struct net_device *dev; |
1472 | int err; | |
1473 | ||
f102d66b FW |
1474 | lockdep_assert_held(&net->nft.commit_mutex); |
1475 | lockdep_nfnl_nft_mutex_not_held(); | |
1476 | ||
508f8ccd | 1477 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], |
fceb6435 | 1478 | nft_hook_policy, NULL); |
508f8ccd PNA |
1479 | if (err < 0) |
1480 | return err; | |
1481 | ||
1482 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1483 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1484 | return -EINVAL; | |
1485 | ||
1486 | hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
508f8ccd PNA |
1487 | hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
1488 | ||
36596dad | 1489 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
508f8ccd | 1490 | if (nla[NFTA_CHAIN_TYPE]) { |
452238e8 | 1491 | type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE], |
445509eb | 1492 | family, autoload); |
508f8ccd PNA |
1493 | if (IS_ERR(type)) |
1494 | return PTR_ERR(type); | |
1495 | } | |
1496 | if (!(type->hook_mask & (1 << hook->num))) | |
1497 | return -EOPNOTSUPP; | |
84ba7dd7 FW |
1498 | |
1499 | if (type->type == NFT_CHAIN_T_NAT && | |
1500 | hook->priority <= NF_IP_PRI_CONNTRACK) | |
1501 | return -EOPNOTSUPP; | |
1502 | ||
508f8ccd PNA |
1503 | if (!try_module_get(type->owner)) |
1504 | return -ENOENT; | |
1505 | ||
1506 | hook->type = type; | |
1507 | ||
1508 | hook->dev = NULL; | |
36596dad | 1509 | if (family == NFPROTO_NETDEV) { |
508f8ccd PNA |
1510 | char ifname[IFNAMSIZ]; |
1511 | ||
1512 | if (!ha[NFTA_HOOK_DEV]) { | |
1513 | module_put(type->owner); | |
1514 | return -EOPNOTSUPP; | |
1515 | } | |
1516 | ||
1517 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); | |
90d2723c | 1518 | dev = __dev_get_by_name(net, ifname); |
508f8ccd PNA |
1519 | if (!dev) { |
1520 | module_put(type->owner); | |
1521 | return -ENOENT; | |
1522 | } | |
1523 | hook->dev = dev; | |
1524 | } else if (ha[NFTA_HOOK_DEV]) { | |
1525 | module_put(type->owner); | |
1526 | return -EOPNOTSUPP; | |
1527 | } | |
1528 | ||
1529 | return 0; | |
1530 | } | |
1531 | ||
1532 | static void nft_chain_release_hook(struct nft_chain_hook *hook) | |
1533 | { | |
1534 | module_put(hook->type->owner); | |
508f8ccd PNA |
1535 | } |
1536 | ||
0cbc06b3 FW |
1537 | struct nft_rules_old { |
1538 | struct rcu_head h; | |
1539 | struct nft_rule **start; | |
1540 | }; | |
1541 | ||
1542 | static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain, | |
1543 | unsigned int alloc) | |
1544 | { | |
1545 | if (alloc > INT_MAX) | |
1546 | return NULL; | |
1547 | ||
1548 | alloc += 1; /* NULL, ends rules */ | |
1549 | if (sizeof(struct nft_rule *) > INT_MAX / alloc) | |
1550 | return NULL; | |
1551 | ||
1552 | alloc *= sizeof(struct nft_rule *); | |
1553 | alloc += sizeof(struct nft_rules_old); | |
1554 | ||
1555 | return kvmalloc(alloc, GFP_KERNEL); | |
1556 | } | |
1557 | ||
4035285f | 1558 | static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask, |
445509eb | 1559 | u8 policy) |
4035285f PNA |
1560 | { |
1561 | const struct nlattr * const *nla = ctx->nla; | |
1562 | struct nft_table *table = ctx->table; | |
4035285f PNA |
1563 | struct nft_base_chain *basechain; |
1564 | struct nft_stats __percpu *stats; | |
1565 | struct net *net = ctx->net; | |
1566 | struct nft_chain *chain; | |
0cbc06b3 | 1567 | struct nft_rule **rules; |
4035285f PNA |
1568 | int err; |
1569 | ||
1570 | if (table->use == UINT_MAX) | |
1571 | return -EOVERFLOW; | |
1572 | ||
1573 | if (nla[NFTA_CHAIN_HOOK]) { | |
1574 | struct nft_chain_hook hook; | |
1575 | struct nf_hook_ops *ops; | |
4035285f | 1576 | |
445509eb | 1577 | err = nft_chain_parse_hook(net, nla, &hook, family, true); |
4035285f PNA |
1578 | if (err < 0) |
1579 | return err; | |
1580 | ||
1581 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); | |
1582 | if (basechain == NULL) { | |
1583 | nft_chain_release_hook(&hook); | |
1584 | return -ENOMEM; | |
1585 | } | |
1586 | ||
1587 | if (hook.dev != NULL) | |
1588 | strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ); | |
1589 | ||
1590 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1591 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1592 | if (IS_ERR(stats)) { | |
1593 | nft_chain_release_hook(&hook); | |
1594 | kfree(basechain); | |
1595 | return PTR_ERR(stats); | |
1596 | } | |
4c05ec47 | 1597 | rcu_assign_pointer(basechain->stats, stats); |
4035285f PNA |
1598 | static_branch_inc(&nft_counters_enabled); |
1599 | } | |
1600 | ||
4035285f PNA |
1601 | basechain->type = hook.type; |
1602 | chain = &basechain->chain; | |
1603 | ||
c974a3a3 PNA |
1604 | ops = &basechain->ops; |
1605 | ops->pf = family; | |
1606 | ops->hooknum = hook.num; | |
1607 | ops->priority = hook.priority; | |
1608 | ops->priv = chain; | |
c2f9eafe | 1609 | ops->hook = hook.type->hooks[ops->hooknum]; |
c974a3a3 | 1610 | ops->dev = hook.dev; |
c974a3a3 | 1611 | |
4035285f PNA |
1612 | chain->flags |= NFT_BASE_CHAIN; |
1613 | basechain->policy = policy; | |
1614 | } else { | |
1615 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1616 | if (chain == NULL) | |
1617 | return -ENOMEM; | |
1618 | } | |
43a605f2 PNA |
1619 | ctx->chain = chain; |
1620 | ||
4035285f PNA |
1621 | INIT_LIST_HEAD(&chain->rules); |
1622 | chain->handle = nf_tables_alloc_handle(table); | |
1623 | chain->table = table; | |
1624 | chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL); | |
1625 | if (!chain->name) { | |
1626 | err = -ENOMEM; | |
1627 | goto err1; | |
1628 | } | |
1629 | ||
0cbc06b3 FW |
1630 | rules = nf_tables_chain_alloc_rules(chain, 0); |
1631 | if (!rules) { | |
1632 | err = -ENOMEM; | |
1633 | goto err1; | |
1634 | } | |
1635 | ||
1636 | *rules = NULL; | |
1637 | rcu_assign_pointer(chain->rules_gen_0, rules); | |
1638 | rcu_assign_pointer(chain->rules_gen_1, rules); | |
1639 | ||
c974a3a3 | 1640 | err = nf_tables_register_hook(net, table, chain); |
4035285f PNA |
1641 | if (err < 0) |
1642 | goto err1; | |
1643 | ||
1b2470e5 FW |
1644 | err = rhltable_insert_key(&table->chains_ht, chain->name, |
1645 | &chain->rhlhead, nft_chain_ht_params); | |
1646 | if (err) | |
1647 | goto err2; | |
1648 | ||
4035285f | 1649 | err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN); |
1b2470e5 FW |
1650 | if (err < 0) { |
1651 | rhltable_remove(&table->chains_ht, &chain->rhlhead, | |
1652 | nft_chain_ht_params); | |
4035285f | 1653 | goto err2; |
1b2470e5 | 1654 | } |
4035285f PNA |
1655 | |
1656 | table->use++; | |
1657 | list_add_tail_rcu(&chain->list, &table->chains); | |
1658 | ||
1659 | return 0; | |
1660 | err2: | |
c974a3a3 | 1661 | nf_tables_unregister_hook(net, table, chain); |
4035285f | 1662 | err1: |
43a605f2 | 1663 | nf_tables_chain_destroy(ctx); |
4035285f PNA |
1664 | |
1665 | return err; | |
1666 | } | |
1667 | ||
445509eb | 1668 | static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy) |
2c4a488a PNA |
1669 | { |
1670 | const struct nlattr * const *nla = ctx->nla; | |
1671 | struct nft_table *table = ctx->table; | |
1672 | struct nft_chain *chain = ctx->chain; | |
2c4a488a PNA |
1673 | struct nft_base_chain *basechain; |
1674 | struct nft_stats *stats = NULL; | |
1675 | struct nft_chain_hook hook; | |
2c4a488a PNA |
1676 | struct nf_hook_ops *ops; |
1677 | struct nft_trans *trans; | |
c974a3a3 | 1678 | int err; |
2c4a488a PNA |
1679 | |
1680 | if (nla[NFTA_CHAIN_HOOK]) { | |
1681 | if (!nft_is_base_chain(chain)) | |
1682 | return -EBUSY; | |
1683 | ||
36596dad | 1684 | err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family, |
445509eb | 1685 | false); |
2c4a488a PNA |
1686 | if (err < 0) |
1687 | return err; | |
1688 | ||
1689 | basechain = nft_base_chain(chain); | |
1690 | if (basechain->type != hook.type) { | |
1691 | nft_chain_release_hook(&hook); | |
1692 | return -EBUSY; | |
1693 | } | |
1694 | ||
c974a3a3 PNA |
1695 | ops = &basechain->ops; |
1696 | if (ops->hooknum != hook.num || | |
1697 | ops->priority != hook.priority || | |
1698 | ops->dev != hook.dev) { | |
1699 | nft_chain_release_hook(&hook); | |
1700 | return -EBUSY; | |
2c4a488a PNA |
1701 | } |
1702 | nft_chain_release_hook(&hook); | |
1703 | } | |
1704 | ||
1705 | if (nla[NFTA_CHAIN_HANDLE] && | |
1706 | nla[NFTA_CHAIN_NAME]) { | |
1707 | struct nft_chain *chain2; | |
1708 | ||
f102d66b FW |
1709 | chain2 = nft_chain_lookup(ctx->net, table, |
1710 | nla[NFTA_CHAIN_NAME], genmask); | |
0d18779b JC |
1711 | if (!IS_ERR(chain2)) |
1712 | return -EEXIST; | |
2c4a488a PNA |
1713 | } |
1714 | ||
1715 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1716 | if (!nft_is_base_chain(chain)) | |
1717 | return -EOPNOTSUPP; | |
1718 | ||
1719 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1720 | if (IS_ERR(stats)) | |
1721 | return PTR_ERR(stats); | |
1722 | } | |
1723 | ||
c6cc94df | 1724 | err = -ENOMEM; |
2c4a488a PNA |
1725 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, |
1726 | sizeof(struct nft_trans_chain)); | |
c6cc94df FW |
1727 | if (trans == NULL) |
1728 | goto err; | |
2c4a488a PNA |
1729 | |
1730 | nft_trans_chain_stats(trans) = stats; | |
1731 | nft_trans_chain_update(trans) = true; | |
1732 | ||
1733 | if (nla[NFTA_CHAIN_POLICY]) | |
1734 | nft_trans_chain_policy(trans) = policy; | |
1735 | else | |
1736 | nft_trans_chain_policy(trans) = -1; | |
1737 | ||
c6cc94df FW |
1738 | if (nla[NFTA_CHAIN_HANDLE] && |
1739 | nla[NFTA_CHAIN_NAME]) { | |
1740 | struct nft_trans *tmp; | |
1741 | char *name; | |
1742 | ||
1743 | err = -ENOMEM; | |
1744 | name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL); | |
1745 | if (!name) | |
1746 | goto err; | |
1747 | ||
1748 | err = -EEXIST; | |
1749 | list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) { | |
1750 | if (tmp->msg_type == NFT_MSG_NEWCHAIN && | |
1751 | tmp->ctx.table == table && | |
1752 | nft_trans_chain_update(tmp) && | |
1753 | nft_trans_chain_name(tmp) && | |
1754 | strcmp(name, nft_trans_chain_name(tmp)) == 0) { | |
1755 | kfree(name); | |
1756 | goto err; | |
1757 | } | |
2c4a488a | 1758 | } |
c6cc94df FW |
1759 | |
1760 | nft_trans_chain_name(trans) = name; | |
2c4a488a PNA |
1761 | } |
1762 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
1763 | ||
1764 | return 0; | |
c6cc94df FW |
1765 | err: |
1766 | free_percpu(stats); | |
1767 | kfree(trans); | |
1768 | return err; | |
2c4a488a PNA |
1769 | } |
1770 | ||
633c9a84 PNA |
1771 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
1772 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1773 | const struct nlattr * const nla[], |
1774 | struct netlink_ext_ack *extack) | |
96518518 PM |
1775 | { |
1776 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4035285f PNA |
1777 | u8 genmask = nft_genmask_next(net); |
1778 | int family = nfmsg->nfgen_family; | |
36dd1bcc | 1779 | const struct nlattr *attr; |
96518518 PM |
1780 | struct nft_table *table; |
1781 | struct nft_chain *chain; | |
57de2a0c | 1782 | u8 policy = NF_ACCEPT; |
4035285f | 1783 | struct nft_ctx ctx; |
96518518 | 1784 | u64 handle = 0; |
96518518 | 1785 | |
f102d66b FW |
1786 | lockdep_assert_held(&net->nft.commit_mutex); |
1787 | ||
cac20fcd | 1788 | table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask); |
36dd1bcc PNA |
1789 | if (IS_ERR(table)) { |
1790 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); | |
96518518 | 1791 | return PTR_ERR(table); |
36dd1bcc | 1792 | } |
96518518 | 1793 | |
96518518 | 1794 | chain = NULL; |
36dd1bcc | 1795 | attr = nla[NFTA_CHAIN_NAME]; |
96518518 PM |
1796 | |
1797 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1798 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
cac20fcd | 1799 | chain = nft_chain_lookup_byhandle(table, handle, genmask); |
36dd1bcc PNA |
1800 | if (IS_ERR(chain)) { |
1801 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]); | |
96518518 | 1802 | return PTR_ERR(chain); |
36dd1bcc PNA |
1803 | } |
1804 | attr = nla[NFTA_CHAIN_HANDLE]; | |
96518518 | 1805 | } else { |
f102d66b | 1806 | chain = nft_chain_lookup(net, table, attr, genmask); |
96518518 | 1807 | if (IS_ERR(chain)) { |
36dd1bcc PNA |
1808 | if (PTR_ERR(chain) != -ENOENT) { |
1809 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 1810 | return PTR_ERR(chain); |
36dd1bcc | 1811 | } |
96518518 PM |
1812 | chain = NULL; |
1813 | } | |
1814 | } | |
1815 | ||
57de2a0c | 1816 | if (nla[NFTA_CHAIN_POLICY]) { |
f323d954 | 1817 | if (chain != NULL && |
36dd1bcc PNA |
1818 | !nft_is_base_chain(chain)) { |
1819 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); | |
d6b6cb1d | 1820 | return -EOPNOTSUPP; |
36dd1bcc | 1821 | } |
d6b6cb1d PNA |
1822 | |
1823 | if (chain == NULL && | |
36dd1bcc PNA |
1824 | nla[NFTA_CHAIN_HOOK] == NULL) { |
1825 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); | |
57de2a0c | 1826 | return -EOPNOTSUPP; |
36dd1bcc | 1827 | } |
57de2a0c | 1828 | |
8f46df18 | 1829 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1830 | switch (policy) { |
1831 | case NF_DROP: | |
1832 | case NF_ACCEPT: | |
1833 | break; | |
1834 | default: | |
1835 | return -EINVAL; | |
1836 | } | |
1837 | } | |
1838 | ||
98319cb9 | 1839 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
4035285f | 1840 | |
96518518 | 1841 | if (chain != NULL) { |
36dd1bcc PNA |
1842 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
1843 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 1844 | return -EEXIST; |
36dd1bcc | 1845 | } |
96518518 PM |
1846 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
1847 | return -EOPNOTSUPP; | |
1848 | ||
445509eb | 1849 | return nf_tables_updchain(&ctx, genmask, policy); |
96518518 PM |
1850 | } |
1851 | ||
445509eb | 1852 | return nf_tables_addchain(&ctx, family, genmask, policy); |
96518518 PM |
1853 | } |
1854 | ||
633c9a84 PNA |
1855 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
1856 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1857 | const struct nlattr * const nla[], |
1858 | struct netlink_ext_ack *extack) | |
96518518 PM |
1859 | { |
1860 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1861 | u8 genmask = nft_genmask_next(net); |
36dd1bcc PNA |
1862 | int family = nfmsg->nfgen_family; |
1863 | const struct nlattr *attr; | |
96518518 PM |
1864 | struct nft_table *table; |
1865 | struct nft_chain *chain; | |
9dee1474 | 1866 | struct nft_rule *rule; |
91c7b38d | 1867 | struct nft_ctx ctx; |
3ecbfd65 | 1868 | u64 handle; |
9dee1474 PNA |
1869 | u32 use; |
1870 | int err; | |
96518518 | 1871 | |
cac20fcd | 1872 | table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask); |
36dd1bcc PNA |
1873 | if (IS_ERR(table)) { |
1874 | NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); | |
96518518 | 1875 | return PTR_ERR(table); |
36dd1bcc | 1876 | } |
96518518 | 1877 | |
3ecbfd65 | 1878 | if (nla[NFTA_CHAIN_HANDLE]) { |
36dd1bcc PNA |
1879 | attr = nla[NFTA_CHAIN_HANDLE]; |
1880 | handle = be64_to_cpu(nla_get_be64(attr)); | |
cac20fcd | 1881 | chain = nft_chain_lookup_byhandle(table, handle, genmask); |
3ecbfd65 | 1882 | } else { |
36dd1bcc | 1883 | attr = nla[NFTA_CHAIN_NAME]; |
f102d66b | 1884 | chain = nft_chain_lookup(net, table, attr, genmask); |
3ecbfd65 | 1885 | } |
36dd1bcc PNA |
1886 | if (IS_ERR(chain)) { |
1887 | NL_SET_BAD_ATTR(extack, attr); | |
96518518 | 1888 | return PTR_ERR(chain); |
36dd1bcc | 1889 | } |
9dee1474 PNA |
1890 | |
1891 | if (nlh->nlmsg_flags & NLM_F_NONREC && | |
1892 | chain->use > 0) | |
96518518 PM |
1893 | return -EBUSY; |
1894 | ||
98319cb9 | 1895 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0165d932 | 1896 | |
9dee1474 PNA |
1897 | use = chain->use; |
1898 | list_for_each_entry(rule, &chain->rules, list) { | |
1899 | if (!nft_is_active_next(net, rule)) | |
1900 | continue; | |
1901 | use--; | |
1902 | ||
1903 | err = nft_delrule(&ctx, rule); | |
1904 | if (err < 0) | |
1905 | return err; | |
1906 | } | |
1907 | ||
1908 | /* There are rules and elements that are still holding references to us, | |
1909 | * we cannot do a recursive removal in this case. | |
1910 | */ | |
36dd1bcc PNA |
1911 | if (use > 0) { |
1912 | NL_SET_BAD_ATTR(extack, attr); | |
9dee1474 | 1913 | return -EBUSY; |
36dd1bcc | 1914 | } |
9dee1474 | 1915 | |
ee01d542 | 1916 | return nft_delchain(&ctx); |
96518518 PM |
1917 | } |
1918 | ||
96518518 PM |
1919 | /* |
1920 | * Expressions | |
1921 | */ | |
1922 | ||
1923 | /** | |
ef1f7df9 PM |
1924 | * nft_register_expr - register nf_tables expr type |
1925 | * @ops: expr type | |
96518518 | 1926 | * |
ef1f7df9 | 1927 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1928 | * success or a negative errno code otherwise. |
1929 | */ | |
ef1f7df9 | 1930 | int nft_register_expr(struct nft_expr_type *type) |
96518518 | 1931 | { |
0ef235c7 FW |
1932 | if (!nft_expr_check_ops(type->ops)) |
1933 | return -EINVAL; | |
1934 | ||
96518518 | 1935 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
758dbcec | 1936 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1937 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1938 | else |
e688a7f8 | 1939 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1940 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1941 | return 0; | |
1942 | } | |
1943 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1944 | ||
1945 | /** | |
ef1f7df9 PM |
1946 | * nft_unregister_expr - unregister nf_tables expr type |
1947 | * @ops: expr type | |
96518518 | 1948 | * |
ef1f7df9 | 1949 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1950 | */ |
ef1f7df9 | 1951 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1952 | { |
1953 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1954 | list_del_rcu(&type->list); |
96518518 PM |
1955 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1956 | } | |
1957 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1958 | ||
64d46806 PM |
1959 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1960 | struct nlattr *nla) | |
96518518 | 1961 | { |
ef1f7df9 | 1962 | const struct nft_expr_type *type; |
96518518 | 1963 | |
ef1f7df9 | 1964 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1965 | if (!nla_strcmp(nla, type->name) && |
1966 | (!type->family || type->family == family)) | |
ef1f7df9 | 1967 | return type; |
96518518 PM |
1968 | } |
1969 | return NULL; | |
1970 | } | |
1971 | ||
452238e8 FW |
1972 | static const struct nft_expr_type *nft_expr_type_get(struct net *net, |
1973 | u8 family, | |
64d46806 | 1974 | struct nlattr *nla) |
96518518 | 1975 | { |
ef1f7df9 | 1976 | const struct nft_expr_type *type; |
96518518 PM |
1977 | |
1978 | if (nla == NULL) | |
1979 | return ERR_PTR(-EINVAL); | |
1980 | ||
64d46806 | 1981 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1982 | if (type != NULL && try_module_get(type->owner)) |
1983 | return type; | |
96518518 | 1984 | |
f102d66b | 1985 | lockdep_nfnl_nft_mutex_not_held(); |
96518518 | 1986 | #ifdef CONFIG_MODULES |
ef1f7df9 | 1987 | if (type == NULL) { |
452238e8 FW |
1988 | nft_request_module(net, "nft-expr-%u-%.*s", family, |
1989 | nla_len(nla), (char *)nla_data(nla)); | |
64d46806 PM |
1990 | if (__nft_expr_type_get(family, nla)) |
1991 | return ERR_PTR(-EAGAIN); | |
1992 | ||
452238e8 FW |
1993 | nft_request_module(net, "nft-expr-%.*s", |
1994 | nla_len(nla), (char *)nla_data(nla)); | |
64d46806 | 1995 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1996 | return ERR_PTR(-EAGAIN); |
1997 | } | |
1998 | #endif | |
1999 | return ERR_PTR(-ENOENT); | |
2000 | } | |
2001 | ||
2002 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
2003 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
2004 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
2005 | }; | |
2006 | ||
2007 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
2008 | const struct nft_expr *expr) | |
2009 | { | |
ef1f7df9 | 2010 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
2011 | goto nla_put_failure; |
2012 | ||
2013 | if (expr->ops->dump) { | |
2014 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
2015 | if (data == NULL) | |
2016 | goto nla_put_failure; | |
2017 | if (expr->ops->dump(skb, expr) < 0) | |
2018 | goto nla_put_failure; | |
2019 | nla_nest_end(skb, data); | |
2020 | } | |
2021 | ||
2022 | return skb->len; | |
2023 | ||
2024 | nla_put_failure: | |
2025 | return -1; | |
2026 | }; | |
2027 | ||
0b2d8a7b PM |
2028 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
2029 | const struct nft_expr *expr) | |
2030 | { | |
2031 | struct nlattr *nest; | |
2032 | ||
2033 | nest = nla_nest_start(skb, attr); | |
2034 | if (!nest) | |
2035 | goto nla_put_failure; | |
2036 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
2037 | goto nla_put_failure; | |
2038 | nla_nest_end(skb, nest); | |
2039 | return 0; | |
2040 | ||
2041 | nla_put_failure: | |
2042 | return -1; | |
2043 | } | |
2044 | ||
96518518 PM |
2045 | struct nft_expr_info { |
2046 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 2047 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
2048 | }; |
2049 | ||
0ca743a5 PNA |
2050 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
2051 | const struct nlattr *nla, | |
96518518 PM |
2052 | struct nft_expr_info *info) |
2053 | { | |
ef1f7df9 | 2054 | const struct nft_expr_type *type; |
96518518 | 2055 | const struct nft_expr_ops *ops; |
ef1f7df9 | 2056 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
2057 | int err; |
2058 | ||
fceb6435 | 2059 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL); |
96518518 PM |
2060 | if (err < 0) |
2061 | return err; | |
2062 | ||
452238e8 | 2063 | type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
2064 | if (IS_ERR(type)) |
2065 | return PTR_ERR(type); | |
2066 | ||
2067 | if (tb[NFTA_EXPR_DATA]) { | |
2068 | err = nla_parse_nested(info->tb, type->maxattr, | |
fceb6435 | 2069 | tb[NFTA_EXPR_DATA], type->policy, NULL); |
ef1f7df9 PM |
2070 | if (err < 0) |
2071 | goto err1; | |
2072 | } else | |
2073 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
2074 | ||
2075 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
2076 | ops = type->select_ops(ctx, |
2077 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
2078 | if (IS_ERR(ops)) { |
2079 | err = PTR_ERR(ops); | |
2080 | goto err1; | |
2081 | } | |
0ef235c7 FW |
2082 | if (!nft_expr_check_ops(ops)) { |
2083 | err = -EINVAL; | |
2084 | goto err1; | |
2085 | } | |
ef1f7df9 PM |
2086 | } else |
2087 | ops = type->ops; | |
2088 | ||
96518518 PM |
2089 | info->ops = ops; |
2090 | return 0; | |
ef1f7df9 PM |
2091 | |
2092 | err1: | |
2093 | module_put(type->owner); | |
2094 | return err; | |
96518518 PM |
2095 | } |
2096 | ||
2097 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 2098 | const struct nft_expr_info *info, |
96518518 PM |
2099 | struct nft_expr *expr) |
2100 | { | |
2101 | const struct nft_expr_ops *ops = info->ops; | |
2102 | int err; | |
2103 | ||
2104 | expr->ops = ops; | |
2105 | if (ops->init) { | |
ef1f7df9 | 2106 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
2107 | if (err < 0) |
2108 | goto err1; | |
2109 | } | |
2110 | ||
96518518 | 2111 | return 0; |
96518518 PM |
2112 | err1: |
2113 | expr->ops = NULL; | |
2114 | return err; | |
2115 | } | |
2116 | ||
62472bce PM |
2117 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
2118 | struct nft_expr *expr) | |
96518518 PM |
2119 | { |
2120 | if (expr->ops->destroy) | |
62472bce | 2121 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 2122 | module_put(expr->ops->type->owner); |
96518518 PM |
2123 | } |
2124 | ||
0b2d8a7b PM |
2125 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
2126 | const struct nlattr *nla) | |
2127 | { | |
2128 | struct nft_expr_info info; | |
2129 | struct nft_expr *expr; | |
2130 | int err; | |
2131 | ||
2132 | err = nf_tables_expr_parse(ctx, nla, &info); | |
2133 | if (err < 0) | |
2134 | goto err1; | |
2135 | ||
2136 | err = -ENOMEM; | |
2137 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
2138 | if (expr == NULL) | |
2139 | goto err2; | |
2140 | ||
2141 | err = nf_tables_newexpr(ctx, &info, expr); | |
2142 | if (err < 0) | |
6cafaf47 | 2143 | goto err3; |
0b2d8a7b PM |
2144 | |
2145 | return expr; | |
6cafaf47 LZ |
2146 | err3: |
2147 | kfree(expr); | |
0b2d8a7b PM |
2148 | err2: |
2149 | module_put(info.ops->type->owner); | |
2150 | err1: | |
2151 | return ERR_PTR(err); | |
2152 | } | |
2153 | ||
2154 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
2155 | { | |
2156 | nf_tables_expr_destroy(ctx, expr); | |
2157 | kfree(expr); | |
2158 | } | |
2159 | ||
96518518 PM |
2160 | /* |
2161 | * Rules | |
2162 | */ | |
2163 | ||
cac20fcd PNA |
2164 | static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain, |
2165 | u64 handle) | |
96518518 PM |
2166 | { |
2167 | struct nft_rule *rule; | |
2168 | ||
2169 | // FIXME: this sucks | |
d9adf22a | 2170 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
96518518 PM |
2171 | if (handle == rule->handle) |
2172 | return rule; | |
2173 | } | |
2174 | ||
2175 | return ERR_PTR(-ENOENT); | |
2176 | } | |
2177 | ||
cac20fcd PNA |
2178 | static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain, |
2179 | const struct nlattr *nla) | |
96518518 PM |
2180 | { |
2181 | if (nla == NULL) | |
2182 | return ERR_PTR(-EINVAL); | |
2183 | ||
cac20fcd | 2184 | return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); |
96518518 PM |
2185 | } |
2186 | ||
2187 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
b2fbd044 LZ |
2188 | [NFTA_RULE_TABLE] = { .type = NLA_STRING, |
2189 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
2190 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
2191 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
2192 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
2193 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 2194 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 2195 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
2196 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
2197 | .len = NFT_USERDATA_MAXLEN }, | |
467697d2 | 2198 | [NFTA_RULE_ID] = { .type = NLA_U32 }, |
96518518 PM |
2199 | }; |
2200 | ||
84d7fce6 PNA |
2201 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
2202 | u32 portid, u32 seq, int event, | |
2203 | u32 flags, int family, | |
96518518 PM |
2204 | const struct nft_table *table, |
2205 | const struct nft_chain *chain, | |
2206 | const struct nft_rule *rule) | |
2207 | { | |
2208 | struct nlmsghdr *nlh; | |
2209 | struct nfgenmsg *nfmsg; | |
2210 | const struct nft_expr *expr, *next; | |
2211 | struct nlattr *list; | |
5e948466 | 2212 | const struct nft_rule *prule; |
dedb67c4 | 2213 | u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 | 2214 | |
dedb67c4 | 2215 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags); |
96518518 PM |
2216 | if (nlh == NULL) |
2217 | goto nla_put_failure; | |
2218 | ||
2219 | nfmsg = nlmsg_data(nlh); | |
2220 | nfmsg->nfgen_family = family; | |
2221 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 2222 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
2223 | |
2224 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
2225 | goto nla_put_failure; | |
2226 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
2227 | goto nla_put_failure; | |
b46f6ded ND |
2228 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), |
2229 | NFTA_RULE_PAD)) | |
96518518 PM |
2230 | goto nla_put_failure; |
2231 | ||
5e948466 | 2232 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
cbbb40e2 | 2233 | prule = list_prev_entry(rule, list); |
5e948466 | 2234 | if (nla_put_be64(skb, NFTA_RULE_POSITION, |
b46f6ded ND |
2235 | cpu_to_be64(prule->handle), |
2236 | NFTA_RULE_PAD)) | |
5e948466 EL |
2237 | goto nla_put_failure; |
2238 | } | |
2239 | ||
96518518 PM |
2240 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
2241 | if (list == NULL) | |
2242 | goto nla_put_failure; | |
2243 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 2244 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 2245 | goto nla_put_failure; |
96518518 PM |
2246 | } |
2247 | nla_nest_end(skb, list); | |
2248 | ||
86f1ec32 PM |
2249 | if (rule->udata) { |
2250 | struct nft_userdata *udata = nft_userdata(rule); | |
2251 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
2252 | udata->data) < 0) | |
2253 | goto nla_put_failure; | |
2254 | } | |
0768b3b3 | 2255 | |
053c095a JB |
2256 | nlmsg_end(skb, nlh); |
2257 | return 0; | |
96518518 PM |
2258 | |
2259 | nla_put_failure: | |
2260 | nlmsg_trim(skb, nlh); | |
2261 | return -1; | |
2262 | } | |
2263 | ||
25e94a99 PNA |
2264 | static void nf_tables_rule_notify(const struct nft_ctx *ctx, |
2265 | const struct nft_rule *rule, int event) | |
96518518 PM |
2266 | { |
2267 | struct sk_buff *skb; | |
96518518 PM |
2268 | int err; |
2269 | ||
128ad332 PNA |
2270 | if (!ctx->report && |
2271 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 2272 | return; |
96518518 | 2273 | |
96518518 PM |
2274 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
2275 | if (skb == NULL) | |
2276 | goto err; | |
2277 | ||
84d7fce6 | 2278 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 2279 | event, 0, ctx->family, ctx->table, |
35151d84 | 2280 | ctx->chain, rule); |
96518518 PM |
2281 | if (err < 0) { |
2282 | kfree_skb(skb); | |
2283 | goto err; | |
2284 | } | |
2285 | ||
25e94a99 PNA |
2286 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
2287 | ctx->report, GFP_KERNEL); | |
2288 | return; | |
96518518 | 2289 | err: |
25e94a99 | 2290 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
2291 | } |
2292 | ||
6e1f760e | 2293 | struct nft_rule_dump_ctx { |
e46abbcc | 2294 | char *table; |
b7263e07 | 2295 | char *chain; |
6e1f760e PNA |
2296 | }; |
2297 | ||
241faece PS |
2298 | static int __nf_tables_dump_rules(struct sk_buff *skb, |
2299 | unsigned int *idx, | |
2300 | struct netlink_callback *cb, | |
2301 | const struct nft_table *table, | |
2302 | const struct nft_chain *chain) | |
2303 | { | |
2304 | struct net *net = sock_net(skb->sk); | |
2305 | unsigned int s_idx = cb->args[0]; | |
2306 | const struct nft_rule *rule; | |
241faece PS |
2307 | |
2308 | list_for_each_entry_rcu(rule, &chain->rules, list) { | |
2309 | if (!nft_is_active(net, rule)) | |
2310 | goto cont; | |
2311 | if (*idx < s_idx) | |
2312 | goto cont; | |
2313 | if (*idx > s_idx) { | |
2314 | memset(&cb->args[1], 0, | |
2315 | sizeof(cb->args) - sizeof(cb->args[0])); | |
2316 | } | |
2317 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, | |
2318 | cb->nlh->nlmsg_seq, | |
2319 | NFT_MSG_NEWRULE, | |
2320 | NLM_F_MULTI | NLM_F_APPEND, | |
2321 | table->family, | |
2322 | table, chain, rule) < 0) | |
310529e6 | 2323 | return 1; |
241faece PS |
2324 | |
2325 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
2326 | cont: | |
2327 | (*idx)++; | |
2328 | } | |
310529e6 | 2329 | return 0; |
241faece PS |
2330 | } |
2331 | ||
96518518 PM |
2332 | static int nf_tables_dump_rules(struct sk_buff *skb, |
2333 | struct netlink_callback *cb) | |
2334 | { | |
2335 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
6e1f760e | 2336 | const struct nft_rule_dump_ctx *ctx = cb->data; |
241faece | 2337 | struct nft_table *table; |
96518518 | 2338 | const struct nft_chain *chain; |
241faece | 2339 | unsigned int idx = 0; |
99633ab2 | 2340 | struct net *net = sock_net(skb->sk); |
96518518 PM |
2341 | int family = nfmsg->nfgen_family; |
2342 | ||
e688a7f8 | 2343 | rcu_read_lock(); |
38e029f1 PNA |
2344 | cb->seq = net->nft.base_seq; |
2345 | ||
36596dad | 2346 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 2347 | if (family != NFPROTO_UNSPEC && family != table->family) |
36596dad PNA |
2348 | continue; |
2349 | ||
2350 | if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0) | |
96518518 PM |
2351 | continue; |
2352 | ||
241faece PS |
2353 | if (ctx && ctx->chain) { |
2354 | struct rhlist_head *list, *tmp; | |
6e1f760e | 2355 | |
241faece PS |
2356 | list = rhltable_lookup(&table->chains_ht, ctx->chain, |
2357 | nft_chain_ht_params); | |
2358 | if (!list) | |
2359 | goto done; | |
2360 | ||
2361 | rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) { | |
2362 | if (!nft_is_active(net, chain)) | |
2363 | continue; | |
2364 | __nf_tables_dump_rules(skb, &idx, | |
2365 | cb, table, chain); | |
2366 | break; | |
96518518 | 2367 | } |
241faece | 2368 | goto done; |
96518518 | 2369 | } |
241faece PS |
2370 | |
2371 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
2372 | if (__nf_tables_dump_rules(skb, &idx, cb, table, chain)) | |
2373 | goto done; | |
2374 | } | |
2375 | ||
2376 | if (ctx && ctx->table) | |
2377 | break; | |
96518518 PM |
2378 | } |
2379 | done: | |
e688a7f8 | 2380 | rcu_read_unlock(); |
310529e6 PS |
2381 | |
2382 | cb->args[0] = idx; | |
96518518 PM |
2383 | return skb->len; |
2384 | } | |
2385 | ||
90fd131a FW |
2386 | static int nf_tables_dump_rules_start(struct netlink_callback *cb) |
2387 | { | |
2388 | const struct nlattr * const *nla = cb->data; | |
2389 | struct nft_rule_dump_ctx *ctx = NULL; | |
2390 | ||
2391 | if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { | |
2392 | ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); | |
2393 | if (!ctx) | |
2394 | return -ENOMEM; | |
2395 | ||
2396 | if (nla[NFTA_RULE_TABLE]) { | |
2397 | ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], | |
2398 | GFP_ATOMIC); | |
2399 | if (!ctx->table) { | |
2400 | kfree(ctx); | |
2401 | return -ENOMEM; | |
2402 | } | |
2403 | } | |
2404 | if (nla[NFTA_RULE_CHAIN]) { | |
2405 | ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], | |
2406 | GFP_ATOMIC); | |
2407 | if (!ctx->chain) { | |
2408 | kfree(ctx->table); | |
2409 | kfree(ctx); | |
2410 | return -ENOMEM; | |
2411 | } | |
2412 | } | |
2413 | } | |
2414 | ||
2415 | cb->data = ctx; | |
2416 | return 0; | |
2417 | } | |
2418 | ||
6e1f760e PNA |
2419 | static int nf_tables_dump_rules_done(struct netlink_callback *cb) |
2420 | { | |
e46abbcc PS |
2421 | struct nft_rule_dump_ctx *ctx = cb->data; |
2422 | ||
2423 | if (ctx) { | |
2424 | kfree(ctx->table); | |
b7263e07 | 2425 | kfree(ctx->chain); |
e46abbcc PS |
2426 | kfree(ctx); |
2427 | } | |
6e1f760e PNA |
2428 | return 0; |
2429 | } | |
2430 | ||
d9adf22a | 2431 | /* called with rcu_read_lock held */ |
7b8002a1 PNA |
2432 | static int nf_tables_getrule(struct net *net, struct sock *nlsk, |
2433 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2434 | const struct nlattr * const nla[], |
2435 | struct netlink_ext_ack *extack) | |
96518518 PM |
2436 | { |
2437 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2438 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
2439 | const struct nft_chain *chain; |
2440 | const struct nft_rule *rule; | |
1b2470e5 | 2441 | struct nft_table *table; |
96518518 PM |
2442 | struct sk_buff *skb2; |
2443 | int family = nfmsg->nfgen_family; | |
2444 | int err; | |
2445 | ||
2446 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2447 | struct netlink_dump_control c = { | |
90fd131a | 2448 | .start= nf_tables_dump_rules_start, |
96518518 | 2449 | .dump = nf_tables_dump_rules, |
6e1f760e | 2450 | .done = nf_tables_dump_rules_done, |
d9adf22a | 2451 | .module = THIS_MODULE, |
90fd131a | 2452 | .data = (void *)nla, |
96518518 | 2453 | }; |
6e1f760e | 2454 | |
d9adf22a | 2455 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
96518518 PM |
2456 | } |
2457 | ||
cac20fcd | 2458 | table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask); |
36dd1bcc PNA |
2459 | if (IS_ERR(table)) { |
2460 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); | |
96518518 | 2461 | return PTR_ERR(table); |
36dd1bcc | 2462 | } |
96518518 | 2463 | |
f102d66b | 2464 | chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask); |
36dd1bcc PNA |
2465 | if (IS_ERR(chain)) { |
2466 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); | |
96518518 | 2467 | return PTR_ERR(chain); |
36dd1bcc | 2468 | } |
96518518 | 2469 | |
cac20fcd | 2470 | rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); |
36dd1bcc PNA |
2471 | if (IS_ERR(rule)) { |
2472 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
96518518 | 2473 | return PTR_ERR(rule); |
36dd1bcc | 2474 | } |
96518518 | 2475 | |
d9adf22a | 2476 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
96518518 PM |
2477 | if (!skb2) |
2478 | return -ENOMEM; | |
2479 | ||
84d7fce6 | 2480 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
2481 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
2482 | family, table, chain, rule); | |
2483 | if (err < 0) | |
2484 | goto err; | |
2485 | ||
2486 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2487 | ||
2488 | err: | |
2489 | kfree_skb(skb2); | |
2490 | return err; | |
2491 | } | |
2492 | ||
62472bce PM |
2493 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
2494 | struct nft_rule *rule) | |
96518518 | 2495 | { |
29e38801 | 2496 | struct nft_expr *expr, *next; |
96518518 PM |
2497 | |
2498 | /* | |
2499 | * Careful: some expressions might not be initialized in case this | |
2500 | * is called on error from nf_tables_newrule(). | |
2501 | */ | |
2502 | expr = nft_expr_first(rule); | |
3e38df13 | 2503 | while (expr != nft_expr_last(rule) && expr->ops) { |
29e38801 | 2504 | next = nft_expr_next(expr); |
62472bce | 2505 | nf_tables_expr_destroy(ctx, expr); |
29e38801 | 2506 | expr = next; |
96518518 PM |
2507 | } |
2508 | kfree(rule); | |
2509 | } | |
2510 | ||
bb7b40ae PNA |
2511 | static void nf_tables_rule_release(const struct nft_ctx *ctx, |
2512 | struct nft_rule *rule) | |
2513 | { | |
2514 | nft_rule_expr_deactivate(ctx, rule); | |
2515 | nf_tables_rule_destroy(ctx, rule); | |
2516 | } | |
2517 | ||
a654de8f PNA |
2518 | int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain) |
2519 | { | |
2520 | struct nft_expr *expr, *last; | |
2521 | const struct nft_data *data; | |
2522 | struct nft_rule *rule; | |
2523 | int err; | |
2524 | ||
26b2f552 TY |
2525 | if (ctx->level == NFT_JUMP_STACK_SIZE) |
2526 | return -EMLINK; | |
2527 | ||
a654de8f PNA |
2528 | list_for_each_entry(rule, &chain->rules, list) { |
2529 | if (!nft_is_active_next(ctx->net, rule)) | |
2530 | continue; | |
2531 | ||
2532 | nft_rule_for_each_expr(expr, last, rule) { | |
2533 | if (!expr->ops->validate) | |
2534 | continue; | |
2535 | ||
2536 | err = expr->ops->validate(ctx, expr, &data); | |
2537 | if (err < 0) | |
2538 | return err; | |
2539 | } | |
2540 | } | |
2541 | ||
2542 | return 0; | |
2543 | } | |
2544 | EXPORT_SYMBOL_GPL(nft_chain_validate); | |
2545 | ||
2546 | static int nft_table_validate(struct net *net, const struct nft_table *table) | |
2547 | { | |
2548 | struct nft_chain *chain; | |
2549 | struct nft_ctx ctx = { | |
2550 | .net = net, | |
2551 | .family = table->family, | |
2552 | }; | |
2553 | int err; | |
2554 | ||
2555 | list_for_each_entry(chain, &table->chains, list) { | |
2556 | if (!nft_is_base_chain(chain)) | |
2557 | continue; | |
2558 | ||
2559 | ctx.chain = chain; | |
2560 | err = nft_chain_validate(&ctx, chain); | |
2561 | if (err < 0) | |
2562 | return err; | |
2563 | } | |
2564 | ||
2565 | return 0; | |
2566 | } | |
2567 | ||
1081d11b PNA |
2568 | #define NFT_RULE_MAXEXPRS 128 |
2569 | ||
633c9a84 PNA |
2570 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
2571 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2572 | const struct nlattr * const nla[], |
2573 | struct netlink_ext_ack *extack) | |
96518518 PM |
2574 | { |
2575 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2576 | u8 genmask = nft_genmask_next(net); |
2a43ecf9 | 2577 | struct nft_expr_info *info = NULL; |
98319cb9 | 2578 | int family = nfmsg->nfgen_family; |
96518518 PM |
2579 | struct nft_table *table; |
2580 | struct nft_chain *chain; | |
2581 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 2582 | struct nft_userdata *udata; |
1081d11b | 2583 | struct nft_trans *trans = NULL; |
96518518 PM |
2584 | struct nft_expr *expr; |
2585 | struct nft_ctx ctx; | |
2586 | struct nlattr *tmp; | |
86f1ec32 | 2587 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 | 2588 | int err, rem; |
5e948466 | 2589 | u64 handle, pos_handle; |
96518518 | 2590 | |
f102d66b FW |
2591 | lockdep_assert_held(&net->nft.commit_mutex); |
2592 | ||
cac20fcd | 2593 | table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask); |
36dd1bcc PNA |
2594 | if (IS_ERR(table)) { |
2595 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); | |
96518518 | 2596 | return PTR_ERR(table); |
36dd1bcc | 2597 | } |
96518518 | 2598 | |
f102d66b | 2599 | chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask); |
36dd1bcc PNA |
2600 | if (IS_ERR(chain)) { |
2601 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); | |
96518518 | 2602 | return PTR_ERR(chain); |
36dd1bcc | 2603 | } |
96518518 PM |
2604 | |
2605 | if (nla[NFTA_RULE_HANDLE]) { | |
2606 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
cac20fcd | 2607 | rule = __nft_rule_lookup(chain, handle); |
36dd1bcc PNA |
2608 | if (IS_ERR(rule)) { |
2609 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
96518518 | 2610 | return PTR_ERR(rule); |
36dd1bcc | 2611 | } |
96518518 | 2612 | |
36dd1bcc PNA |
2613 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
2614 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
96518518 | 2615 | return -EEXIST; |
36dd1bcc | 2616 | } |
96518518 PM |
2617 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
2618 | old_rule = rule; | |
2619 | else | |
2620 | return -EOPNOTSUPP; | |
2621 | } else { | |
445509eb PNA |
2622 | if (!(nlh->nlmsg_flags & NLM_F_CREATE) || |
2623 | nlh->nlmsg_flags & NLM_F_REPLACE) | |
96518518 PM |
2624 | return -EINVAL; |
2625 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
2626 | |
2627 | if (chain->use == UINT_MAX) | |
2628 | return -EOVERFLOW; | |
5e948466 | 2629 | |
447750f2 FW |
2630 | if (nla[NFTA_RULE_POSITION]) { |
2631 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
2632 | old_rule = __nft_rule_lookup(chain, pos_handle); | |
2633 | if (IS_ERR(old_rule)) { | |
2634 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]); | |
2635 | return PTR_ERR(old_rule); | |
2636 | } | |
36dd1bcc | 2637 | } |
5e948466 EL |
2638 | } |
2639 | ||
98319cb9 | 2640 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0ca743a5 | 2641 | |
96518518 PM |
2642 | n = 0; |
2643 | size = 0; | |
2644 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2a43ecf9 FW |
2645 | info = kvmalloc_array(NFT_RULE_MAXEXPRS, |
2646 | sizeof(struct nft_expr_info), | |
2647 | GFP_KERNEL); | |
2648 | if (!info) | |
2649 | return -ENOMEM; | |
2650 | ||
96518518 PM |
2651 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { |
2652 | err = -EINVAL; | |
2653 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2654 | goto err1; | |
2655 | if (n == NFT_RULE_MAXEXPRS) | |
2656 | goto err1; | |
0ca743a5 | 2657 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2658 | if (err < 0) |
2659 | goto err1; | |
2660 | size += info[n].ops->size; | |
2661 | n++; | |
2662 | } | |
2663 | } | |
9889840f PM |
2664 | /* Check for overflow of dlen field */ |
2665 | err = -EFBIG; | |
2666 | if (size >= 1 << 12) | |
2667 | goto err1; | |
96518518 | 2668 | |
86f1ec32 | 2669 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2670 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2671 | if (ulen > 0) |
2672 | usize = sizeof(struct nft_userdata) + ulen; | |
2673 | } | |
0768b3b3 | 2674 | |
96518518 | 2675 | err = -ENOMEM; |
86f1ec32 | 2676 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2677 | if (rule == NULL) |
2678 | goto err1; | |
2679 | ||
889f7ee7 | 2680 | nft_activate_next(net, rule); |
0628b123 | 2681 | |
96518518 PM |
2682 | rule->handle = handle; |
2683 | rule->dlen = size; | |
86f1ec32 | 2684 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2685 | |
86f1ec32 PM |
2686 | if (ulen) { |
2687 | udata = nft_userdata(rule); | |
2688 | udata->len = ulen - 1; | |
2689 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2690 | } | |
96518518 | 2691 | |
96518518 PM |
2692 | expr = nft_expr_first(rule); |
2693 | for (i = 0; i < n; i++) { | |
2694 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2695 | if (err < 0) | |
2696 | goto err2; | |
a654de8f PNA |
2697 | |
2698 | if (info[i].ops->validate) | |
2699 | nft_validate_state_update(net, NFT_VALIDATE_NEED); | |
2700 | ||
ef1f7df9 | 2701 | info[i].ops = NULL; |
96518518 PM |
2702 | expr = nft_expr_next(expr); |
2703 | } | |
2704 | ||
96518518 | 2705 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
ca089878 | 2706 | trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule); |
569ccae6 FW |
2707 | if (trans == NULL) { |
2708 | err = -ENOMEM; | |
2709 | goto err2; | |
2710 | } | |
ca089878 TY |
2711 | err = nft_delrule(&ctx, old_rule); |
2712 | if (err < 0) { | |
2713 | nft_trans_destroy(trans); | |
569ccae6 FW |
2714 | goto err2; |
2715 | } | |
2716 | ||
2717 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2718 | } else { | |
2719 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { | |
2720 | err = -ENOMEM; | |
2721 | goto err2; | |
2722 | } | |
2723 | ||
2724 | if (nlh->nlmsg_flags & NLM_F_APPEND) { | |
2725 | if (old_rule) | |
2726 | list_add_rcu(&rule->list, &old_rule->list); | |
2727 | else | |
2728 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2729 | } else { | |
2730 | if (old_rule) | |
2731 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2732 | else | |
2733 | list_add_rcu(&rule->list, &chain->rules); | |
2734 | } | |
0628b123 | 2735 | } |
2a43ecf9 | 2736 | kvfree(info); |
4fefee57 | 2737 | chain->use++; |
96518518 | 2738 | |
a654de8f PNA |
2739 | if (net->nft.validate_state == NFT_VALIDATE_DO) |
2740 | return nft_table_validate(net, table); | |
2741 | ||
2742 | return 0; | |
96518518 | 2743 | err2: |
bb7b40ae | 2744 | nf_tables_rule_release(&ctx, rule); |
96518518 PM |
2745 | err1: |
2746 | for (i = 0; i < n; i++) { | |
2747 | if (info[i].ops != NULL) | |
ef1f7df9 | 2748 | module_put(info[i].ops->type->owner); |
96518518 | 2749 | } |
2a43ecf9 | 2750 | kvfree(info); |
96518518 PM |
2751 | return err; |
2752 | } | |
2753 | ||
1a94e38d PNA |
2754 | static struct nft_rule *nft_rule_lookup_byid(const struct net *net, |
2755 | const struct nlattr *nla) | |
2756 | { | |
2757 | u32 id = ntohl(nla_get_be32(nla)); | |
2758 | struct nft_trans *trans; | |
2759 | ||
2760 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
2761 | struct nft_rule *rule = nft_trans_rule(trans); | |
2762 | ||
2763 | if (trans->msg_type == NFT_MSG_NEWRULE && | |
2764 | id == nft_trans_rule_id(trans)) | |
2765 | return rule; | |
2766 | } | |
2767 | return ERR_PTR(-ENOENT); | |
2768 | } | |
2769 | ||
633c9a84 PNA |
2770 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
2771 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2772 | const struct nlattr * const nla[], |
2773 | struct netlink_ext_ack *extack) | |
96518518 PM |
2774 | { |
2775 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2776 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2777 | struct nft_table *table; |
cf9dc09d PNA |
2778 | struct nft_chain *chain = NULL; |
2779 | struct nft_rule *rule; | |
0628b123 PNA |
2780 | int family = nfmsg->nfgen_family, err = 0; |
2781 | struct nft_ctx ctx; | |
96518518 | 2782 | |
cac20fcd | 2783 | table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask); |
36dd1bcc PNA |
2784 | if (IS_ERR(table)) { |
2785 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); | |
96518518 | 2786 | return PTR_ERR(table); |
36dd1bcc | 2787 | } |
96518518 | 2788 | |
cf9dc09d | 2789 | if (nla[NFTA_RULE_CHAIN]) { |
f102d66b FW |
2790 | chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], |
2791 | genmask); | |
36dd1bcc PNA |
2792 | if (IS_ERR(chain)) { |
2793 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); | |
cf9dc09d | 2794 | return PTR_ERR(chain); |
36dd1bcc | 2795 | } |
cf9dc09d | 2796 | } |
96518518 | 2797 | |
98319cb9 | 2798 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0628b123 | 2799 | |
cf9dc09d PNA |
2800 | if (chain) { |
2801 | if (nla[NFTA_RULE_HANDLE]) { | |
cac20fcd | 2802 | rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); |
36dd1bcc PNA |
2803 | if (IS_ERR(rule)) { |
2804 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); | |
cf9dc09d | 2805 | return PTR_ERR(rule); |
36dd1bcc | 2806 | } |
96518518 | 2807 | |
1a94e38d PNA |
2808 | err = nft_delrule(&ctx, rule); |
2809 | } else if (nla[NFTA_RULE_ID]) { | |
2810 | rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]); | |
36dd1bcc PNA |
2811 | if (IS_ERR(rule)) { |
2812 | NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]); | |
1a94e38d | 2813 | return PTR_ERR(rule); |
36dd1bcc | 2814 | } |
1a94e38d | 2815 | |
5e266fe7 | 2816 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2817 | } else { |
ce24b721 | 2818 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2819 | } |
2820 | } else { | |
2821 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
2822 | if (!nft_is_active_next(net, chain)) |
2823 | continue; | |
2824 | ||
cf9dc09d | 2825 | ctx.chain = chain; |
ce24b721 | 2826 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2827 | if (err < 0) |
2828 | break; | |
2829 | } | |
2830 | } | |
2831 | ||
2832 | return err; | |
2833 | } | |
2834 | ||
20a69341 PM |
2835 | /* |
2836 | * Sets | |
2837 | */ | |
2838 | ||
2b664957 | 2839 | static LIST_HEAD(nf_tables_set_types); |
20a69341 | 2840 | |
2b664957 | 2841 | int nft_register_set(struct nft_set_type *type) |
20a69341 PM |
2842 | { |
2843 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2844 | list_add_tail_rcu(&type->list, &nf_tables_set_types); |
20a69341 PM |
2845 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2846 | return 0; | |
2847 | } | |
2848 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2849 | ||
2b664957 | 2850 | void nft_unregister_set(struct nft_set_type *type) |
20a69341 PM |
2851 | { |
2852 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2853 | list_del_rcu(&type->list); |
20a69341 PM |
2854 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2855 | } | |
2856 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2857 | ||
2b664957 | 2858 | #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ |
71cc0873 PS |
2859 | NFT_SET_TIMEOUT | NFT_SET_OBJECT | \ |
2860 | NFT_SET_EVAL) | |
2b664957 | 2861 | |
71cc0873 | 2862 | static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags) |
2b664957 | 2863 | { |
71cc0873 | 2864 | return (flags & type->features) == (flags & NFT_SET_FEATURES); |
2b664957 PNA |
2865 | } |
2866 | ||
c50b960c PM |
2867 | /* |
2868 | * Select a set implementation based on the data characteristics and the | |
2869 | * given policy. The total memory use might not be known if no size is | |
2870 | * given, in that case the amount of memory per element is used. | |
2871 | */ | |
2872 | static const struct nft_set_ops * | |
2b664957 PNA |
2873 | nft_select_set_ops(const struct nft_ctx *ctx, |
2874 | const struct nlattr * const nla[], | |
c50b960c PM |
2875 | const struct nft_set_desc *desc, |
2876 | enum nft_set_policies policy) | |
20a69341 | 2877 | { |
c50b960c PM |
2878 | const struct nft_set_ops *ops, *bops; |
2879 | struct nft_set_estimate est, best; | |
2b664957 PNA |
2880 | const struct nft_set_type *type; |
2881 | u32 flags = 0; | |
20a69341 | 2882 | |
f102d66b FW |
2883 | lockdep_assert_held(&ctx->net->nft.commit_mutex); |
2884 | lockdep_nfnl_nft_mutex_not_held(); | |
20a69341 | 2885 | #ifdef CONFIG_MODULES |
2b664957 | 2886 | if (list_empty(&nf_tables_set_types)) { |
452238e8 | 2887 | nft_request_module(ctx->net, "nft-set"); |
2b664957 | 2888 | if (!list_empty(&nf_tables_set_types)) |
20a69341 PM |
2889 | return ERR_PTR(-EAGAIN); |
2890 | } | |
2891 | #endif | |
2b664957 PNA |
2892 | if (nla[NFTA_SET_FLAGS] != NULL) |
2893 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
20a69341 | 2894 | |
55af753c PNA |
2895 | bops = NULL; |
2896 | best.size = ~0; | |
2897 | best.lookup = ~0; | |
0b5a7874 | 2898 | best.space = ~0; |
c50b960c | 2899 | |
2b664957 | 2900 | list_for_each_entry(type, &nf_tables_set_types, list) { |
71cc0873 | 2901 | ops = &type->ops; |
2b664957 | 2902 | |
71cc0873 | 2903 | if (!nft_set_ops_candidate(type, flags)) |
20a69341 | 2904 | continue; |
2b664957 | 2905 | if (!ops->estimate(desc, flags, &est)) |
c50b960c PM |
2906 | continue; |
2907 | ||
2908 | switch (policy) { | |
2909 | case NFT_SET_POL_PERFORMANCE: | |
55af753c | 2910 | if (est.lookup < best.lookup) |
c50b960c | 2911 | break; |
644e334e PNA |
2912 | if (est.lookup == best.lookup && |
2913 | est.space < best.space) | |
2914 | break; | |
c50b960c PM |
2915 | continue; |
2916 | case NFT_SET_POL_MEMORY: | |
0b5a7874 PNA |
2917 | if (!desc->size) { |
2918 | if (est.space < best.space) | |
2919 | break; | |
2920 | if (est.space == best.space && | |
2921 | est.lookup < best.lookup) | |
2922 | break; | |
4f2921ca | 2923 | } else if (est.size < best.size || !bops) { |
c50b960c | 2924 | break; |
0b5a7874 | 2925 | } |
c50b960c PM |
2926 | continue; |
2927 | default: | |
2928 | break; | |
2929 | } | |
2930 | ||
2b664957 | 2931 | if (!try_module_get(type->owner)) |
20a69341 | 2932 | continue; |
c50b960c | 2933 | if (bops != NULL) |
71cc0873 | 2934 | module_put(to_set_type(bops)->owner); |
c50b960c PM |
2935 | |
2936 | bops = ops; | |
2937 | best = est; | |
20a69341 PM |
2938 | } |
2939 | ||
c50b960c PM |
2940 | if (bops != NULL) |
2941 | return bops; | |
2942 | ||
20a69341 PM |
2943 | return ERR_PTR(-EOPNOTSUPP); |
2944 | } | |
2945 | ||
2946 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
b2fbd044 LZ |
2947 | [NFTA_SET_TABLE] = { .type = NLA_STRING, |
2948 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
a9bdd836 | 2949 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
cb39ad8b | 2950 | .len = NFT_SET_MAXNAMELEN - 1 }, |
20a69341 PM |
2951 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2952 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2953 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2954 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2955 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2956 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2957 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2958 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2959 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2960 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
e6d8ecac CFG |
2961 | [NFTA_SET_USERDATA] = { .type = NLA_BINARY, |
2962 | .len = NFT_USERDATA_MAXLEN }, | |
8aeff920 | 2963 | [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, |
3ecbfd65 | 2964 | [NFTA_SET_HANDLE] = { .type = NLA_U64 }, |
c50b960c PM |
2965 | }; |
2966 | ||
2967 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2968 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2969 | }; |
2970 | ||
633c9a84 | 2971 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
2972 | const struct sk_buff *skb, |
2973 | const struct nlmsghdr *nlh, | |
f2a6d766 | 2974 | const struct nlattr * const nla[], |
36dd1bcc | 2975 | struct netlink_ext_ack *extack, |
f2a6d766 | 2976 | u8 genmask) |
20a69341 PM |
2977 | { |
2978 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
98319cb9 | 2979 | int family = nfmsg->nfgen_family; |
7c95f6d8 | 2980 | struct nft_table *table = NULL; |
20a69341 | 2981 | |
20a69341 | 2982 | if (nla[NFTA_SET_TABLE] != NULL) { |
cac20fcd PNA |
2983 | table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, |
2984 | genmask); | |
36dd1bcc PNA |
2985 | if (IS_ERR(table)) { |
2986 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); | |
20a69341 | 2987 | return PTR_ERR(table); |
36dd1bcc | 2988 | } |
20a69341 PM |
2989 | } |
2990 | ||
98319cb9 | 2991 | nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 PM |
2992 | return 0; |
2993 | } | |
2994 | ||
cac20fcd PNA |
2995 | static struct nft_set *nft_set_lookup(const struct nft_table *table, |
2996 | const struct nlattr *nla, u8 genmask) | |
20a69341 PM |
2997 | { |
2998 | struct nft_set *set; | |
2999 | ||
3000 | if (nla == NULL) | |
3001 | return ERR_PTR(-EINVAL); | |
3002 | ||
d9adf22a | 3003 | list_for_each_entry_rcu(set, &table->sets, list) { |
37a9cc52 PNA |
3004 | if (!nla_strcmp(nla, set->name) && |
3005 | nft_active_genmask(set, genmask)) | |
20a69341 PM |
3006 | return set; |
3007 | } | |
3008 | return ERR_PTR(-ENOENT); | |
3009 | } | |
3010 | ||
cac20fcd PNA |
3011 | static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table, |
3012 | const struct nlattr *nla, | |
3013 | u8 genmask) | |
3ecbfd65 HS |
3014 | { |
3015 | struct nft_set *set; | |
3016 | ||
3ecbfd65 HS |
3017 | list_for_each_entry(set, &table->sets, list) { |
3018 | if (be64_to_cpu(nla_get_be64(nla)) == set->handle && | |
3019 | nft_active_genmask(set, genmask)) | |
3020 | return set; | |
3021 | } | |
3022 | return ERR_PTR(-ENOENT); | |
3023 | } | |
3024 | ||
cac20fcd PNA |
3025 | static struct nft_set *nft_set_lookup_byid(const struct net *net, |
3026 | const struct nlattr *nla, u8 genmask) | |
958bee14 PNA |
3027 | { |
3028 | struct nft_trans *trans; | |
3029 | u32 id = ntohl(nla_get_be32(nla)); | |
3030 | ||
3031 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
9c7f96fd AK |
3032 | if (trans->msg_type == NFT_MSG_NEWSET) { |
3033 | struct nft_set *set = nft_trans_set(trans); | |
37a9cc52 | 3034 | |
9c7f96fd AK |
3035 | if (id == nft_trans_set_id(trans) && |
3036 | nft_active_genmask(set, genmask)) | |
3037 | return set; | |
3038 | } | |
958bee14 PNA |
3039 | } |
3040 | return ERR_PTR(-ENOENT); | |
3041 | } | |
c7a72e3f | 3042 | |
10659cba PNA |
3043 | struct nft_set *nft_set_lookup_global(const struct net *net, |
3044 | const struct nft_table *table, | |
3045 | const struct nlattr *nla_set_name, | |
3046 | const struct nlattr *nla_set_id, | |
3047 | u8 genmask) | |
c7a72e3f PNA |
3048 | { |
3049 | struct nft_set *set; | |
3050 | ||
cac20fcd | 3051 | set = nft_set_lookup(table, nla_set_name, genmask); |
c7a72e3f PNA |
3052 | if (IS_ERR(set)) { |
3053 | if (!nla_set_id) | |
3054 | return set; | |
3055 | ||
cac20fcd | 3056 | set = nft_set_lookup_byid(net, nla_set_id, genmask); |
c7a72e3f PNA |
3057 | } |
3058 | return set; | |
3059 | } | |
10659cba | 3060 | EXPORT_SYMBOL_GPL(nft_set_lookup_global); |
958bee14 | 3061 | |
20a69341 PM |
3062 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
3063 | const char *name) | |
3064 | { | |
3065 | const struct nft_set *i; | |
3066 | const char *p; | |
3067 | unsigned long *inuse; | |
60eb1894 | 3068 | unsigned int n = 0, min = 0; |
20a69341 | 3069 | |
38745490 | 3070 | p = strchr(name, '%'); |
20a69341 PM |
3071 | if (p != NULL) { |
3072 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
3073 | return -EINVAL; | |
3074 | ||
3075 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
3076 | if (inuse == NULL) | |
3077 | return -ENOMEM; | |
60eb1894 | 3078 | cont: |
20a69341 | 3079 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
3080 | int tmp; |
3081 | ||
37a9cc52 PNA |
3082 | if (!nft_is_active_next(ctx->net, set)) |
3083 | continue; | |
14662917 | 3084 | if (!sscanf(i->name, name, &tmp)) |
20a69341 | 3085 | continue; |
60eb1894 | 3086 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 3087 | continue; |
14662917 | 3088 | |
60eb1894 | 3089 | set_bit(tmp - min, inuse); |
20a69341 PM |
3090 | } |
3091 | ||
53b70287 | 3092 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
3093 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
3094 | min += BITS_PER_BYTE * PAGE_SIZE; | |
3095 | memset(inuse, 0, PAGE_SIZE); | |
3096 | goto cont; | |
3097 | } | |
20a69341 PM |
3098 | free_page((unsigned long)inuse); |
3099 | } | |
3100 | ||
38745490 PS |
3101 | set->name = kasprintf(GFP_KERNEL, name, min + n); |
3102 | if (!set->name) | |
3103 | return -ENOMEM; | |
3104 | ||
20a69341 | 3105 | list_for_each_entry(i, &ctx->table->sets, list) { |
37a9cc52 PNA |
3106 | if (!nft_is_active_next(ctx->net, i)) |
3107 | continue; | |
e63aaaa6 AY |
3108 | if (!strcmp(set->name, i->name)) { |
3109 | kfree(set->name); | |
20a69341 | 3110 | return -ENFILE; |
e63aaaa6 | 3111 | } |
20a69341 PM |
3112 | } |
3113 | return 0; | |
3114 | } | |
3115 | ||
8e1102d5 FW |
3116 | static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result) |
3117 | { | |
3118 | u64 ms = be64_to_cpu(nla_get_be64(nla)); | |
3119 | u64 max = (u64)(~((u64)0)); | |
3120 | ||
3121 | max = div_u64(max, NSEC_PER_MSEC); | |
3122 | if (ms >= max) | |
3123 | return -ERANGE; | |
3124 | ||
3125 | ms *= NSEC_PER_MSEC; | |
3126 | *result = nsecs_to_jiffies64(ms); | |
3127 | return 0; | |
3128 | } | |
3129 | ||
d6501de8 | 3130 | static __be64 nf_jiffies64_to_msecs(u64 input) |
8e1102d5 FW |
3131 | { |
3132 | u64 ms = jiffies64_to_nsecs(input); | |
3133 | ||
3134 | return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC)); | |
3135 | } | |
3136 | ||
20a69341 PM |
3137 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, |
3138 | const struct nft_set *set, u16 event, u16 flags) | |
3139 | { | |
3140 | struct nfgenmsg *nfmsg; | |
3141 | struct nlmsghdr *nlh; | |
c50b960c | 3142 | struct nlattr *desc; |
128ad332 PNA |
3143 | u32 portid = ctx->portid; |
3144 | u32 seq = ctx->seq; | |
20a69341 | 3145 | |
dedb67c4 | 3146 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
20a69341 PM |
3147 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
3148 | flags); | |
3149 | if (nlh == NULL) | |
3150 | goto nla_put_failure; | |
3151 | ||
3152 | nfmsg = nlmsg_data(nlh); | |
36596dad | 3153 | nfmsg->nfgen_family = ctx->family; |
20a69341 | 3154 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 3155 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
3156 | |
3157 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3158 | goto nla_put_failure; | |
3159 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3160 | goto nla_put_failure; | |
3ecbfd65 HS |
3161 | if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle), |
3162 | NFTA_SET_PAD)) | |
3163 | goto nla_put_failure; | |
20a69341 PM |
3164 | if (set->flags != 0) |
3165 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
3166 | goto nla_put_failure; | |
3167 | ||
3168 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
3169 | goto nla_put_failure; | |
3170 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
3171 | goto nla_put_failure; | |
3172 | if (set->flags & NFT_SET_MAP) { | |
3173 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
3174 | goto nla_put_failure; | |
3175 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
3176 | goto nla_put_failure; | |
3177 | } | |
8aeff920 PNA |
3178 | if (set->flags & NFT_SET_OBJECT && |
3179 | nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) | |
3180 | goto nla_put_failure; | |
20a69341 | 3181 | |
761da293 | 3182 | if (set->timeout && |
d3e2a111 | 3183 | nla_put_be64(skb, NFTA_SET_TIMEOUT, |
8e1102d5 | 3184 | nf_jiffies64_to_msecs(set->timeout), |
b46f6ded | 3185 | NFTA_SET_PAD)) |
761da293 PM |
3186 | goto nla_put_failure; |
3187 | if (set->gc_int && | |
3188 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
3189 | goto nla_put_failure; | |
3190 | ||
9363dc4b AB |
3191 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
3192 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
3193 | goto nla_put_failure; | |
3194 | } | |
3195 | ||
e6d8ecac CFG |
3196 | if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) |
3197 | goto nla_put_failure; | |
3198 | ||
c50b960c PM |
3199 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
3200 | if (desc == NULL) | |
3201 | goto nla_put_failure; | |
3202 | if (set->size && | |
3203 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
3204 | goto nla_put_failure; | |
3205 | nla_nest_end(skb, desc); | |
3206 | ||
053c095a JB |
3207 | nlmsg_end(skb, nlh); |
3208 | return 0; | |
20a69341 PM |
3209 | |
3210 | nla_put_failure: | |
3211 | nlmsg_trim(skb, nlh); | |
3212 | return -1; | |
3213 | } | |
3214 | ||
25e94a99 PNA |
3215 | static void nf_tables_set_notify(const struct nft_ctx *ctx, |
3216 | const struct nft_set *set, int event, | |
3217 | gfp_t gfp_flags) | |
20a69341 PM |
3218 | { |
3219 | struct sk_buff *skb; | |
128ad332 | 3220 | u32 portid = ctx->portid; |
20a69341 PM |
3221 | int err; |
3222 | ||
128ad332 PNA |
3223 | if (!ctx->report && |
3224 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 3225 | return; |
20a69341 | 3226 | |
31f8441c | 3227 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
3228 | if (skb == NULL) |
3229 | goto err; | |
3230 | ||
3231 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
3232 | if (err < 0) { | |
3233 | kfree_skb(skb); | |
3234 | goto err; | |
3235 | } | |
3236 | ||
25e94a99 PNA |
3237 | nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report, |
3238 | gfp_flags); | |
3239 | return; | |
20a69341 | 3240 | err: |
25e94a99 | 3241 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
20a69341 PM |
3242 | } |
3243 | ||
5b96af77 | 3244 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
3245 | { |
3246 | const struct nft_set *set; | |
3247 | unsigned int idx, s_idx = cb->args[0]; | |
c9c8e485 PNA |
3248 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
3249 | struct net *net = sock_net(skb->sk); | |
5b96af77 | 3250 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
3251 | |
3252 | if (cb->args[1]) | |
3253 | return skb->len; | |
3254 | ||
e688a7f8 | 3255 | rcu_read_lock(); |
38e029f1 PNA |
3256 | cb->seq = net->nft.base_seq; |
3257 | ||
36596dad PNA |
3258 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
3259 | if (ctx->family != NFPROTO_UNSPEC && | |
98319cb9 | 3260 | ctx->family != table->family) |
36596dad PNA |
3261 | continue; |
3262 | ||
3263 | if (ctx->table && ctx->table != table) | |
5b96af77 PNA |
3264 | continue; |
3265 | ||
36596dad PNA |
3266 | if (cur_table) { |
3267 | if (cur_table != table) | |
c9c8e485 PNA |
3268 | continue; |
3269 | ||
36596dad | 3270 | cur_table = NULL; |
c9c8e485 | 3271 | } |
36596dad PNA |
3272 | idx = 0; |
3273 | list_for_each_entry_rcu(set, &table->sets, list) { | |
3274 | if (idx < s_idx) | |
3275 | goto cont; | |
3276 | if (!nft_is_active(net, set)) | |
3277 | goto cont; | |
5b96af77 | 3278 | |
36596dad PNA |
3279 | ctx_set = *ctx; |
3280 | ctx_set.table = table; | |
98319cb9 | 3281 | ctx_set.family = table->family; |
c9c8e485 | 3282 | |
36596dad PNA |
3283 | if (nf_tables_fill_set(skb, &ctx_set, set, |
3284 | NFT_MSG_NEWSET, | |
3285 | NLM_F_MULTI) < 0) { | |
3286 | cb->args[0] = idx; | |
3287 | cb->args[2] = (unsigned long) table; | |
3288 | goto done; | |
c9c8e485 | 3289 | } |
36596dad | 3290 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 | 3291 | cont: |
36596dad | 3292 | idx++; |
c9c8e485 | 3293 | } |
36596dad PNA |
3294 | if (s_idx) |
3295 | s_idx = 0; | |
c9c8e485 PNA |
3296 | } |
3297 | cb->args[1] = 1; | |
3298 | done: | |
e688a7f8 | 3299 | rcu_read_unlock(); |
c9c8e485 PNA |
3300 | return skb->len; |
3301 | } | |
3302 | ||
90fd131a FW |
3303 | static int nf_tables_dump_sets_start(struct netlink_callback *cb) |
3304 | { | |
3305 | struct nft_ctx *ctx_dump = NULL; | |
3306 | ||
3307 | ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC); | |
3308 | if (ctx_dump == NULL) | |
3309 | return -ENOMEM; | |
3310 | ||
3311 | cb->data = ctx_dump; | |
3312 | return 0; | |
3313 | } | |
3314 | ||
5b96af77 | 3315 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 3316 | { |
5b96af77 PNA |
3317 | kfree(cb->data); |
3318 | return 0; | |
20a69341 PM |
3319 | } |
3320 | ||
d9adf22a | 3321 | /* called with rcu_read_lock held */ |
7b8002a1 PNA |
3322 | static int nf_tables_getset(struct net *net, struct sock *nlsk, |
3323 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3324 | const struct nlattr * const nla[], |
3325 | struct netlink_ext_ack *extack) | |
20a69341 | 3326 | { |
f2a6d766 | 3327 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
3328 | const struct nft_set *set; |
3329 | struct nft_ctx ctx; | |
3330 | struct sk_buff *skb2; | |
c9c8e485 | 3331 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
3332 | int err; |
3333 | ||
01cfa0a4 | 3334 | /* Verify existence before starting dump */ |
36dd1bcc PNA |
3335 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack, |
3336 | genmask); | |
20a69341 PM |
3337 | if (err < 0) |
3338 | return err; | |
3339 | ||
3340 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3341 | struct netlink_dump_control c = { | |
90fd131a | 3342 | .start = nf_tables_dump_sets_start, |
20a69341 | 3343 | .dump = nf_tables_dump_sets, |
5b96af77 | 3344 | .done = nf_tables_dump_sets_done, |
90fd131a | 3345 | .data = &ctx, |
d9adf22a | 3346 | .module = THIS_MODULE, |
20a69341 | 3347 | }; |
5b96af77 | 3348 | |
d9adf22a | 3349 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
20a69341 PM |
3350 | } |
3351 | ||
c9c8e485 PNA |
3352 | /* Only accept unspec with dump */ |
3353 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
3354 | return -EAFNOSUPPORT; | |
eaa2bcd6 PT |
3355 | if (!nla[NFTA_SET_TABLE]) |
3356 | return -EINVAL; | |
c9c8e485 | 3357 | |
cac20fcd | 3358 | set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3359 | if (IS_ERR(set)) |
3360 | return PTR_ERR(set); | |
3361 | ||
d9adf22a | 3362 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
20a69341 PM |
3363 | if (skb2 == NULL) |
3364 | return -ENOMEM; | |
3365 | ||
3366 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
3367 | if (err < 0) | |
3368 | goto err; | |
3369 | ||
3370 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
3371 | ||
3372 | err: | |
3373 | kfree_skb(skb2); | |
3374 | return err; | |
3375 | } | |
3376 | ||
c50b960c PM |
3377 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
3378 | struct nft_set_desc *desc, | |
3379 | const struct nlattr *nla) | |
3380 | { | |
3381 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
3382 | int err; | |
3383 | ||
fceb6435 JB |
3384 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, |
3385 | nft_set_desc_policy, NULL); | |
c50b960c PM |
3386 | if (err < 0) |
3387 | return err; | |
3388 | ||
3389 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
3390 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
3391 | ||
3392 | return 0; | |
3393 | } | |
3394 | ||
633c9a84 PNA |
3395 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
3396 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3397 | const struct nlattr * const nla[], |
3398 | struct netlink_ext_ack *extack) | |
20a69341 PM |
3399 | { |
3400 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 3401 | u8 genmask = nft_genmask_next(net); |
98319cb9 | 3402 | int family = nfmsg->nfgen_family; |
20a69341 | 3403 | const struct nft_set_ops *ops; |
20a69341 PM |
3404 | struct nft_table *table; |
3405 | struct nft_set *set; | |
3406 | struct nft_ctx ctx; | |
38745490 | 3407 | char *name; |
4ef360dd | 3408 | u64 size; |
761da293 | 3409 | u64 timeout; |
8aeff920 | 3410 | u32 ktype, dtype, flags, policy, gc_int, objtype; |
c50b960c | 3411 | struct nft_set_desc desc; |
e6d8ecac CFG |
3412 | unsigned char *udata; |
3413 | u16 udlen; | |
20a69341 PM |
3414 | int err; |
3415 | ||
3416 | if (nla[NFTA_SET_TABLE] == NULL || | |
3417 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
3418 | nla[NFTA_SET_KEY_LEN] == NULL || |
3419 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
3420 | return -EINVAL; |
3421 | ||
c50b960c PM |
3422 | memset(&desc, 0, sizeof(desc)); |
3423 | ||
20a69341 PM |
3424 | ktype = NFT_DATA_VALUE; |
3425 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
3426 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
3427 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
3428 | return -EINVAL; | |
3429 | } | |
3430 | ||
c50b960c | 3431 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 3432 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3433 | return -EINVAL; |
3434 | ||
3435 | flags = 0; | |
3436 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
3437 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
3438 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 | 3439 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
8aeff920 PNA |
3440 | NFT_SET_MAP | NFT_SET_EVAL | |
3441 | NFT_SET_OBJECT)) | |
20a69341 | 3442 | return -EINVAL; |
8aeff920 PNA |
3443 | /* Only one of these operations is supported */ |
3444 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) == | |
3445 | (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) | |
7c6c6e95 | 3446 | return -EOPNOTSUPP; |
20a69341 PM |
3447 | } |
3448 | ||
3449 | dtype = 0; | |
20a69341 PM |
3450 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
3451 | if (!(flags & NFT_SET_MAP)) | |
3452 | return -EINVAL; | |
3453 | ||
3454 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
3455 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
3456 | dtype != NFT_DATA_VERDICT) | |
3457 | return -EINVAL; | |
3458 | ||
3459 | if (dtype != NFT_DATA_VERDICT) { | |
3460 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
3461 | return -EINVAL; | |
c50b960c | 3462 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 3463 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3464 | return -EINVAL; |
3465 | } else | |
7d740264 | 3466 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
3467 | } else if (flags & NFT_SET_MAP) |
3468 | return -EINVAL; | |
3469 | ||
8aeff920 PNA |
3470 | if (nla[NFTA_SET_OBJ_TYPE] != NULL) { |
3471 | if (!(flags & NFT_SET_OBJECT)) | |
3472 | return -EINVAL; | |
3473 | ||
3474 | objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); | |
3475 | if (objtype == NFT_OBJECT_UNSPEC || | |
3476 | objtype > NFT_OBJECT_MAX) | |
3477 | return -EINVAL; | |
3478 | } else if (flags & NFT_SET_OBJECT) | |
3479 | return -EINVAL; | |
3480 | else | |
3481 | objtype = NFT_OBJECT_UNSPEC; | |
3482 | ||
761da293 PM |
3483 | timeout = 0; |
3484 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
3485 | if (!(flags & NFT_SET_TIMEOUT)) | |
3486 | return -EINVAL; | |
8e1102d5 FW |
3487 | |
3488 | err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout); | |
3489 | if (err) | |
3490 | return err; | |
761da293 PM |
3491 | } |
3492 | gc_int = 0; | |
3493 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
3494 | if (!(flags & NFT_SET_TIMEOUT)) | |
3495 | return -EINVAL; | |
3496 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
3497 | } | |
3498 | ||
c50b960c PM |
3499 | policy = NFT_SET_POL_PERFORMANCE; |
3500 | if (nla[NFTA_SET_POLICY] != NULL) | |
3501 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
3502 | ||
3503 | if (nla[NFTA_SET_DESC] != NULL) { | |
3504 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
3505 | if (err < 0) | |
3506 | return err; | |
3507 | } | |
3508 | ||
cac20fcd | 3509 | table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask); |
36dd1bcc PNA |
3510 | if (IS_ERR(table)) { |
3511 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); | |
20a69341 | 3512 | return PTR_ERR(table); |
36dd1bcc | 3513 | } |
20a69341 | 3514 | |
98319cb9 | 3515 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 | 3516 | |
cac20fcd | 3517 | set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask); |
20a69341 | 3518 | if (IS_ERR(set)) { |
36dd1bcc PNA |
3519 | if (PTR_ERR(set) != -ENOENT) { |
3520 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); | |
20a69341 | 3521 | return PTR_ERR(set); |
36dd1bcc | 3522 | } |
1a28ad74 | 3523 | } else { |
36dd1bcc PNA |
3524 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
3525 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); | |
20a69341 | 3526 | return -EEXIST; |
36dd1bcc | 3527 | } |
20a69341 PM |
3528 | if (nlh->nlmsg_flags & NLM_F_REPLACE) |
3529 | return -EOPNOTSUPP; | |
36dd1bcc | 3530 | |
20a69341 PM |
3531 | return 0; |
3532 | } | |
3533 | ||
3534 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
3535 | return -ENOENT; | |
3536 | ||
2b664957 | 3537 | ops = nft_select_set_ops(&ctx, nla, &desc, policy); |
20a69341 PM |
3538 | if (IS_ERR(ops)) |
3539 | return PTR_ERR(ops); | |
3540 | ||
e6d8ecac CFG |
3541 | udlen = 0; |
3542 | if (nla[NFTA_SET_USERDATA]) | |
3543 | udlen = nla_len(nla[NFTA_SET_USERDATA]); | |
3544 | ||
20a69341 PM |
3545 | size = 0; |
3546 | if (ops->privsize != NULL) | |
347b408d | 3547 | size = ops->privsize(nla, &desc); |
20a69341 | 3548 | |
1ff75a3e PNA |
3549 | set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); |
3550 | if (!set) { | |
3551 | err = -ENOMEM; | |
20a69341 | 3552 | goto err1; |
1ff75a3e | 3553 | } |
20a69341 | 3554 | |
38745490 PS |
3555 | name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL); |
3556 | if (!name) { | |
3557 | err = -ENOMEM; | |
3558 | goto err2; | |
3559 | } | |
3560 | ||
20a69341 | 3561 | err = nf_tables_set_alloc_name(&ctx, set, name); |
38745490 | 3562 | kfree(name); |
20a69341 PM |
3563 | if (err < 0) |
3564 | goto err2; | |
3565 | ||
e6d8ecac CFG |
3566 | udata = NULL; |
3567 | if (udlen) { | |
3568 | udata = set->data + size; | |
3569 | nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); | |
3570 | } | |
3571 | ||
20a69341 | 3572 | INIT_LIST_HEAD(&set->bindings); |
3453c927 PNA |
3573 | set->table = table; |
3574 | write_pnet(&set->net, net); | |
20a69341 PM |
3575 | set->ops = ops; |
3576 | set->ktype = ktype; | |
c50b960c | 3577 | set->klen = desc.klen; |
20a69341 | 3578 | set->dtype = dtype; |
8aeff920 | 3579 | set->objtype = objtype; |
c50b960c | 3580 | set->dlen = desc.dlen; |
20a69341 | 3581 | set->flags = flags; |
c50b960c | 3582 | set->size = desc.size; |
9363dc4b | 3583 | set->policy = policy; |
e6d8ecac CFG |
3584 | set->udlen = udlen; |
3585 | set->udata = udata; | |
761da293 PM |
3586 | set->timeout = timeout; |
3587 | set->gc_int = gc_int; | |
3ecbfd65 | 3588 | set->handle = nf_tables_alloc_handle(table); |
20a69341 | 3589 | |
c50b960c | 3590 | err = ops->init(set, &desc, nla); |
20a69341 | 3591 | if (err < 0) |
2f6adf48 | 3592 | goto err3; |
20a69341 | 3593 | |
958bee14 | 3594 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 | 3595 | if (err < 0) |
2f6adf48 | 3596 | goto err4; |
20a69341 | 3597 | |
e688a7f8 | 3598 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 3599 | table->use++; |
20a69341 PM |
3600 | return 0; |
3601 | ||
2f6adf48 | 3602 | err4: |
c17c3cdf | 3603 | ops->destroy(set); |
2f6adf48 FW |
3604 | err3: |
3605 | kfree(set->name); | |
20a69341 | 3606 | err2: |
1ff75a3e | 3607 | kvfree(set); |
20a69341 | 3608 | err1: |
71cc0873 | 3609 | module_put(to_set_type(ops)->owner); |
20a69341 PM |
3610 | return err; |
3611 | } | |
3612 | ||
958bee14 | 3613 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 3614 | { |
20a69341 | 3615 | set->ops->destroy(set); |
71cc0873 | 3616 | module_put(to_set_type(set->ops)->owner); |
38745490 | 3617 | kfree(set->name); |
1ff75a3e | 3618 | kvfree(set); |
20a69341 PM |
3619 | } |
3620 | ||
633c9a84 PNA |
3621 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
3622 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3623 | const struct nlattr * const nla[], |
3624 | struct netlink_ext_ack *extack) | |
20a69341 | 3625 | { |
c9c8e485 | 3626 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
f2a6d766 | 3627 | u8 genmask = nft_genmask_next(net); |
36dd1bcc | 3628 | const struct nlattr *attr; |
20a69341 PM |
3629 | struct nft_set *set; |
3630 | struct nft_ctx ctx; | |
3631 | int err; | |
3632 | ||
ec2c9935 PM |
3633 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
3634 | return -EAFNOSUPPORT; | |
20a69341 PM |
3635 | if (nla[NFTA_SET_TABLE] == NULL) |
3636 | return -EINVAL; | |
3637 | ||
36dd1bcc PNA |
3638 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack, |
3639 | genmask); | |
20a69341 PM |
3640 | if (err < 0) |
3641 | return err; | |
3642 | ||
36dd1bcc PNA |
3643 | if (nla[NFTA_SET_HANDLE]) { |
3644 | attr = nla[NFTA_SET_HANDLE]; | |
3645 | set = nft_set_lookup_byhandle(ctx.table, attr, genmask); | |
3646 | } else { | |
3647 | attr = nla[NFTA_SET_NAME]; | |
3648 | set = nft_set_lookup(ctx.table, attr, genmask); | |
3649 | } | |
a8278400 | 3650 | |
36dd1bcc PNA |
3651 | if (IS_ERR(set)) { |
3652 | NL_SET_BAD_ATTR(extack, attr); | |
3653 | return PTR_ERR(set); | |
3654 | } | |
a8278400 | 3655 | if (!list_empty(&set->bindings) || |
36dd1bcc PNA |
3656 | (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) { |
3657 | NL_SET_BAD_ATTR(extack, attr); | |
20a69341 | 3658 | return -EBUSY; |
36dd1bcc | 3659 | } |
20a69341 | 3660 | |
ee01d542 | 3661 | return nft_delset(&ctx, set); |
20a69341 PM |
3662 | } |
3663 | ||
3664 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 3665 | struct nft_set *set, |
20a69341 | 3666 | const struct nft_set_iter *iter, |
de70185d | 3667 | struct nft_set_elem *elem) |
20a69341 | 3668 | { |
fe2811eb | 3669 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3670 | enum nft_registers dreg; |
3671 | ||
3672 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
3673 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
3674 | set->dtype == NFT_DATA_VERDICT ? | |
3675 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
3676 | set->dlen); | |
20a69341 PM |
3677 | } |
3678 | ||
3679 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3680 | struct nft_set_binding *binding) | |
3681 | { | |
3682 | struct nft_set_binding *i; | |
3683 | struct nft_set_iter iter; | |
3684 | ||
408070d6 | 3685 | if (!list_empty(&set->bindings) && nft_set_is_anonymous(set)) |
20a69341 PM |
3686 | return -EBUSY; |
3687 | ||
11113e19 | 3688 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
3689 | /* If the set is already bound to the same chain all |
3690 | * jumps are already validated for that chain. | |
3691 | */ | |
3692 | list_for_each_entry(i, &set->bindings, list) { | |
a4684402 | 3693 | if (i->flags & NFT_SET_MAP && |
11113e19 | 3694 | i->chain == binding->chain) |
20a69341 PM |
3695 | goto bind; |
3696 | } | |
3697 | ||
8588ac09 | 3698 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
3699 | iter.skip = 0; |
3700 | iter.count = 0; | |
3701 | iter.err = 0; | |
3702 | iter.fn = nf_tables_bind_check_setelem; | |
3703 | ||
3704 | set->ops->walk(ctx, set, &iter); | |
a02f4248 | 3705 | if (iter.err < 0) |
20a69341 | 3706 | return iter.err; |
20a69341 PM |
3707 | } |
3708 | bind: | |
3709 | binding->chain = ctx->chain; | |
e688a7f8 | 3710 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
3711 | return 0; |
3712 | } | |
63aea290 | 3713 | EXPORT_SYMBOL_GPL(nf_tables_bind_set); |
20a69341 | 3714 | |
cd5125d8 | 3715 | void nf_tables_rebind_set(const struct nft_ctx *ctx, struct nft_set *set, |
20a69341 | 3716 | struct nft_set_binding *binding) |
cd5125d8 FW |
3717 | { |
3718 | if (list_empty(&set->bindings) && nft_set_is_anonymous(set) && | |
3719 | nft_is_active(ctx->net, set)) | |
3720 | list_add_tail_rcu(&set->list, &ctx->table->sets); | |
3721 | ||
3722 | list_add_tail_rcu(&binding->list, &set->bindings); | |
3723 | } | |
3724 | EXPORT_SYMBOL_GPL(nf_tables_rebind_set); | |
3725 | ||
3726 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3727 | struct nft_set_binding *binding) | |
20a69341 | 3728 | { |
e688a7f8 | 3729 | list_del_rcu(&binding->list); |
20a69341 | 3730 | |
408070d6 | 3731 | if (list_empty(&set->bindings) && nft_set_is_anonymous(set) && |
37a9cc52 | 3732 | nft_is_active(ctx->net, set)) |
cd5125d8 | 3733 | list_del_rcu(&set->list); |
20a69341 | 3734 | } |
63aea290 | 3735 | EXPORT_SYMBOL_GPL(nf_tables_unbind_set); |
20a69341 | 3736 | |
cd5125d8 FW |
3737 | void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set) |
3738 | { | |
3739 | if (list_empty(&set->bindings) && nft_set_is_anonymous(set) && | |
3740 | nft_is_active(ctx->net, set)) { | |
3741 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); | |
3742 | nft_set_destroy(set); | |
3743 | } | |
3744 | } | |
3745 | EXPORT_SYMBOL_GPL(nf_tables_destroy_set); | |
3746 | ||
3ac4c07a PM |
3747 | const struct nft_set_ext_type nft_set_ext_types[] = { |
3748 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 3749 | .align = __alignof__(u32), |
3ac4c07a PM |
3750 | }, |
3751 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 3752 | .align = __alignof__(u32), |
3ac4c07a | 3753 | }, |
f25ad2e9 PM |
3754 | [NFT_SET_EXT_EXPR] = { |
3755 | .align = __alignof__(struct nft_expr), | |
3756 | }, | |
8aeff920 PNA |
3757 | [NFT_SET_EXT_OBJREF] = { |
3758 | .len = sizeof(struct nft_object *), | |
3759 | .align = __alignof__(struct nft_object *), | |
3760 | }, | |
3ac4c07a PM |
3761 | [NFT_SET_EXT_FLAGS] = { |
3762 | .len = sizeof(u8), | |
3763 | .align = __alignof__(u8), | |
3764 | }, | |
c3e1b005 PM |
3765 | [NFT_SET_EXT_TIMEOUT] = { |
3766 | .len = sizeof(u64), | |
3767 | .align = __alignof__(u64), | |
3768 | }, | |
3769 | [NFT_SET_EXT_EXPIRATION] = { | |
8e1102d5 FW |
3770 | .len = sizeof(u64), |
3771 | .align = __alignof__(u64), | |
c3e1b005 | 3772 | }, |
68e942e8 PM |
3773 | [NFT_SET_EXT_USERDATA] = { |
3774 | .len = sizeof(struct nft_userdata), | |
3775 | .align = __alignof__(struct nft_userdata), | |
3776 | }, | |
3ac4c07a PM |
3777 | }; |
3778 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
3779 | ||
20a69341 PM |
3780 | /* |
3781 | * Set elements | |
3782 | */ | |
3783 | ||
3784 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
3785 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
3786 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
3787 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 3788 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
3789 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
3790 | .len = NFT_USERDATA_MAXLEN }, | |
467697d2 FW |
3791 | [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED }, |
3792 | [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING }, | |
20a69341 PM |
3793 | }; |
3794 | ||
3795 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
b2fbd044 LZ |
3796 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, |
3797 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
3798 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, | |
3799 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
20a69341 | 3800 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
958bee14 | 3801 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
3802 | }; |
3803 | ||
633c9a84 | 3804 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
3805 | const struct sk_buff *skb, |
3806 | const struct nlmsghdr *nlh, | |
f2a6d766 | 3807 | const struct nlattr * const nla[], |
36dd1bcc | 3808 | struct netlink_ext_ack *extack, |
f2a6d766 | 3809 | u8 genmask) |
20a69341 PM |
3810 | { |
3811 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
98319cb9 | 3812 | int family = nfmsg->nfgen_family; |
7c95f6d8 | 3813 | struct nft_table *table; |
20a69341 | 3814 | |
cac20fcd PNA |
3815 | table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, |
3816 | genmask); | |
36dd1bcc PNA |
3817 | if (IS_ERR(table)) { |
3818 | NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); | |
20a69341 | 3819 | return PTR_ERR(table); |
36dd1bcc | 3820 | } |
20a69341 | 3821 | |
98319cb9 | 3822 | nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 PM |
3823 | return 0; |
3824 | } | |
3825 | ||
3826 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
3827 | const struct nft_set *set, | |
3828 | const struct nft_set_elem *elem) | |
3829 | { | |
fe2811eb | 3830 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3831 | unsigned char *b = skb_tail_pointer(skb); |
3832 | struct nlattr *nest; | |
3833 | ||
3834 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
3835 | if (nest == NULL) | |
3836 | goto nla_put_failure; | |
3837 | ||
fe2811eb PM |
3838 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
3839 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
3840 | goto nla_put_failure; |
3841 | ||
fe2811eb PM |
3842 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3843 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
3844 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
3845 | set->dlen) < 0) | |
3846 | goto nla_put_failure; | |
3847 | ||
f25ad2e9 PM |
3848 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3849 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3850 | goto nla_put_failure; | |
3851 | ||
8aeff920 PNA |
3852 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && |
3853 | nla_put_string(skb, NFTA_SET_ELEM_OBJREF, | |
3854 | (*nft_set_ext_obj(ext))->name) < 0) | |
3855 | goto nla_put_failure; | |
3856 | ||
fe2811eb PM |
3857 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3858 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3859 | htonl(*nft_set_ext_flags(ext)))) | |
3860 | goto nla_put_failure; | |
20a69341 | 3861 | |
c3e1b005 PM |
3862 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3863 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
8e1102d5 | 3864 | nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)), |
b46f6ded | 3865 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3866 | goto nla_put_failure; |
3867 | ||
3868 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
8e1102d5 | 3869 | u64 expires, now = get_jiffies_64(); |
c3e1b005 PM |
3870 | |
3871 | expires = *nft_set_ext_expiration(ext); | |
8e1102d5 | 3872 | if (time_before64(now, expires)) |
c3e1b005 PM |
3873 | expires -= now; |
3874 | else | |
3875 | expires = 0; | |
3876 | ||
3877 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
8e1102d5 | 3878 | nf_jiffies64_to_msecs(expires), |
b46f6ded | 3879 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3880 | goto nla_put_failure; |
3881 | } | |
3882 | ||
68e942e8 PM |
3883 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3884 | struct nft_userdata *udata; | |
3885 | ||
3886 | udata = nft_set_ext_userdata(ext); | |
3887 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3888 | udata->len + 1, udata->data)) | |
3889 | goto nla_put_failure; | |
3890 | } | |
3891 | ||
20a69341 PM |
3892 | nla_nest_end(skb, nest); |
3893 | return 0; | |
3894 | ||
3895 | nla_put_failure: | |
3896 | nlmsg_trim(skb, b); | |
3897 | return -EMSGSIZE; | |
3898 | } | |
3899 | ||
3900 | struct nft_set_dump_args { | |
3901 | const struct netlink_callback *cb; | |
3902 | struct nft_set_iter iter; | |
3903 | struct sk_buff *skb; | |
3904 | }; | |
3905 | ||
3906 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
de70185d | 3907 | struct nft_set *set, |
20a69341 | 3908 | const struct nft_set_iter *iter, |
de70185d | 3909 | struct nft_set_elem *elem) |
20a69341 PM |
3910 | { |
3911 | struct nft_set_dump_args *args; | |
3912 | ||
3913 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3914 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3915 | } | |
3916 | ||
fa803605 LZ |
3917 | struct nft_set_dump_ctx { |
3918 | const struct nft_set *set; | |
3919 | struct nft_ctx ctx; | |
3920 | }; | |
3921 | ||
20a69341 PM |
3922 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
3923 | { | |
fa803605 | 3924 | struct nft_set_dump_ctx *dump_ctx = cb->data; |
633c9a84 | 3925 | struct net *net = sock_net(skb->sk); |
fa803605 | 3926 | struct nft_table *table; |
de70185d | 3927 | struct nft_set *set; |
20a69341 | 3928 | struct nft_set_dump_args args; |
fa803605 | 3929 | bool set_found = false; |
20a69341 PM |
3930 | struct nfgenmsg *nfmsg; |
3931 | struct nlmsghdr *nlh; | |
3932 | struct nlattr *nest; | |
3933 | u32 portid, seq; | |
fa803605 | 3934 | int event; |
20a69341 | 3935 | |
fa803605 | 3936 | rcu_read_lock(); |
36596dad PNA |
3937 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
3938 | if (dump_ctx->ctx.family != NFPROTO_UNSPEC && | |
98319cb9 | 3939 | dump_ctx->ctx.family != table->family) |
fa803605 | 3940 | continue; |
20a69341 | 3941 | |
36596dad PNA |
3942 | if (table != dump_ctx->ctx.table) |
3943 | continue; | |
20a69341 | 3944 | |
36596dad PNA |
3945 | list_for_each_entry_rcu(set, &table->sets, list) { |
3946 | if (set == dump_ctx->set) { | |
3947 | set_found = true; | |
3948 | break; | |
fa803605 | 3949 | } |
fa803605 LZ |
3950 | } |
3951 | break; | |
3952 | } | |
3953 | ||
3954 | if (!set_found) { | |
3955 | rcu_read_unlock(); | |
3956 | return -ENOENT; | |
3957 | } | |
20a69341 | 3958 | |
dedb67c4 | 3959 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); |
20a69341 PM |
3960 | portid = NETLINK_CB(cb->skb).portid; |
3961 | seq = cb->nlh->nlmsg_seq; | |
3962 | ||
3963 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3964 | NLM_F_MULTI); | |
3965 | if (nlh == NULL) | |
3966 | goto nla_put_failure; | |
3967 | ||
3968 | nfmsg = nlmsg_data(nlh); | |
98319cb9 | 3969 | nfmsg->nfgen_family = table->family; |
20a69341 | 3970 | nfmsg->version = NFNETLINK_V0; |
fa803605 | 3971 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
20a69341 | 3972 | |
fa803605 | 3973 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) |
20a69341 PM |
3974 | goto nla_put_failure; |
3975 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3976 | goto nla_put_failure; | |
3977 | ||
3978 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3979 | if (nest == NULL) | |
3980 | goto nla_put_failure; | |
3981 | ||
8588ac09 PNA |
3982 | args.cb = cb; |
3983 | args.skb = skb; | |
fa803605 | 3984 | args.iter.genmask = nft_genmask_cur(net); |
8588ac09 PNA |
3985 | args.iter.skip = cb->args[0]; |
3986 | args.iter.count = 0; | |
3987 | args.iter.err = 0; | |
3988 | args.iter.fn = nf_tables_dump_setelem; | |
fa803605 LZ |
3989 | set->ops->walk(&dump_ctx->ctx, set, &args.iter); |
3990 | rcu_read_unlock(); | |
20a69341 PM |
3991 | |
3992 | nla_nest_end(skb, nest); | |
3993 | nlmsg_end(skb, nlh); | |
3994 | ||
3995 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3996 | return args.iter.err; | |
3997 | if (args.iter.count == cb->args[0]) | |
3998 | return 0; | |
3999 | ||
4000 | cb->args[0] = args.iter.count; | |
4001 | return skb->len; | |
4002 | ||
4003 | nla_put_failure: | |
fa803605 | 4004 | rcu_read_unlock(); |
20a69341 PM |
4005 | return -ENOSPC; |
4006 | } | |
4007 | ||
90fd131a FW |
4008 | static int nf_tables_dump_set_start(struct netlink_callback *cb) |
4009 | { | |
4010 | struct nft_set_dump_ctx *dump_ctx = cb->data; | |
4011 | ||
4012 | cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC); | |
4013 | ||
4014 | return cb->data ? 0 : -ENOMEM; | |
4015 | } | |
4016 | ||
fa803605 LZ |
4017 | static int nf_tables_dump_set_done(struct netlink_callback *cb) |
4018 | { | |
4019 | kfree(cb->data); | |
4020 | return 0; | |
4021 | } | |
4022 | ||
d60ce62f AB |
4023 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
4024 | const struct nft_ctx *ctx, u32 seq, | |
4025 | u32 portid, int event, u16 flags, | |
4026 | const struct nft_set *set, | |
4027 | const struct nft_set_elem *elem) | |
4028 | { | |
4029 | struct nfgenmsg *nfmsg; | |
4030 | struct nlmsghdr *nlh; | |
4031 | struct nlattr *nest; | |
4032 | int err; | |
4033 | ||
dedb67c4 | 4034 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
d60ce62f AB |
4035 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
4036 | flags); | |
4037 | if (nlh == NULL) | |
4038 | goto nla_put_failure; | |
4039 | ||
4040 | nfmsg = nlmsg_data(nlh); | |
36596dad | 4041 | nfmsg->nfgen_family = ctx->family; |
d60ce62f | 4042 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 4043 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
4044 | |
4045 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
4046 | goto nla_put_failure; | |
4047 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
4048 | goto nla_put_failure; | |
4049 | ||
4050 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
4051 | if (nest == NULL) | |
4052 | goto nla_put_failure; | |
4053 | ||
4054 | err = nf_tables_fill_setelem(skb, set, elem); | |
4055 | if (err < 0) | |
4056 | goto nla_put_failure; | |
4057 | ||
4058 | nla_nest_end(skb, nest); | |
4059 | ||
053c095a JB |
4060 | nlmsg_end(skb, nlh); |
4061 | return 0; | |
d60ce62f AB |
4062 | |
4063 | nla_put_failure: | |
4064 | nlmsg_trim(skb, nlh); | |
4065 | return -1; | |
4066 | } | |
4067 | ||
ba0e4d99 PNA |
4068 | static int nft_setelem_parse_flags(const struct nft_set *set, |
4069 | const struct nlattr *attr, u32 *flags) | |
4070 | { | |
4071 | if (attr == NULL) | |
4072 | return 0; | |
4073 | ||
4074 | *flags = ntohl(nla_get_be32(attr)); | |
4075 | if (*flags & ~NFT_SET_ELEM_INTERVAL_END) | |
4076 | return -EINVAL; | |
4077 | if (!(set->flags & NFT_SET_INTERVAL) && | |
4078 | *flags & NFT_SET_ELEM_INTERVAL_END) | |
4079 | return -EINVAL; | |
4080 | ||
4081 | return 0; | |
4082 | } | |
4083 | ||
4084 | static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set, | |
4085 | const struct nlattr *attr) | |
4086 | { | |
4087 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
ba0e4d99 PNA |
4088 | struct nft_data_desc desc; |
4089 | struct nft_set_elem elem; | |
4090 | struct sk_buff *skb; | |
4091 | uint32_t flags = 0; | |
4092 | void *priv; | |
4093 | int err; | |
4094 | ||
4095 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
4096 | nft_set_elem_policy, NULL); | |
4097 | if (err < 0) | |
4098 | return err; | |
4099 | ||
4100 | if (!nla[NFTA_SET_ELEM_KEY]) | |
4101 | return -EINVAL; | |
4102 | ||
4103 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
4104 | if (err < 0) | |
4105 | return err; | |
4106 | ||
4107 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, | |
4108 | nla[NFTA_SET_ELEM_KEY]); | |
4109 | if (err < 0) | |
4110 | return err; | |
4111 | ||
4112 | err = -EINVAL; | |
4113 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
4114 | return err; | |
4115 | ||
4116 | priv = set->ops->get(ctx->net, set, &elem, flags); | |
4117 | if (IS_ERR(priv)) | |
4118 | return PTR_ERR(priv); | |
4119 | ||
4120 | elem.priv = priv; | |
ba0e4d99 PNA |
4121 | |
4122 | err = -ENOMEM; | |
d9adf22a | 4123 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); |
ba0e4d99 PNA |
4124 | if (skb == NULL) |
4125 | goto err1; | |
4126 | ||
4127 | err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid, | |
4128 | NFT_MSG_NEWSETELEM, 0, set, &elem); | |
4129 | if (err < 0) | |
4130 | goto err2; | |
4131 | ||
4132 | err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT); | |
4133 | /* This avoids a loop in nfnetlink. */ | |
4134 | if (err < 0) | |
4135 | goto err1; | |
4136 | ||
4137 | return 0; | |
4138 | err2: | |
4139 | kfree_skb(skb); | |
4140 | err1: | |
4141 | /* this avoids a loop in nfnetlink. */ | |
4142 | return err == -EAGAIN ? -ENOBUFS : err; | |
4143 | } | |
4144 | ||
d9adf22a | 4145 | /* called with rcu_read_lock held */ |
ba0e4d99 PNA |
4146 | static int nf_tables_getsetelem(struct net *net, struct sock *nlsk, |
4147 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
4148 | const struct nlattr * const nla[], | |
4149 | struct netlink_ext_ack *extack) | |
4150 | { | |
4151 | u8 genmask = nft_genmask_cur(net); | |
4152 | struct nft_set *set; | |
4153 | struct nlattr *attr; | |
4154 | struct nft_ctx ctx; | |
4155 | int rem, err = 0; | |
4156 | ||
36dd1bcc PNA |
4157 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack, |
4158 | genmask); | |
ba0e4d99 PNA |
4159 | if (err < 0) |
4160 | return err; | |
4161 | ||
cac20fcd | 4162 | set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask); |
ba0e4d99 PNA |
4163 | if (IS_ERR(set)) |
4164 | return PTR_ERR(set); | |
4165 | ||
4166 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
4167 | struct netlink_dump_control c = { | |
90fd131a | 4168 | .start = nf_tables_dump_set_start, |
ba0e4d99 PNA |
4169 | .dump = nf_tables_dump_set, |
4170 | .done = nf_tables_dump_set_done, | |
d9adf22a | 4171 | .module = THIS_MODULE, |
ba0e4d99 | 4172 | }; |
90fd131a FW |
4173 | struct nft_set_dump_ctx dump_ctx = { |
4174 | .set = set, | |
4175 | .ctx = ctx, | |
4176 | }; | |
ba0e4d99 | 4177 | |
90fd131a | 4178 | c.data = &dump_ctx; |
d9adf22a | 4179 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
ba0e4d99 PNA |
4180 | } |
4181 | ||
4182 | if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) | |
4183 | return -EINVAL; | |
4184 | ||
4185 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
4186 | err = nft_get_set_elem(&ctx, set, attr); | |
4187 | if (err < 0) | |
4188 | break; | |
4189 | } | |
4190 | ||
4191 | return err; | |
4192 | } | |
4193 | ||
25e94a99 PNA |
4194 | static void nf_tables_setelem_notify(const struct nft_ctx *ctx, |
4195 | const struct nft_set *set, | |
4196 | const struct nft_set_elem *elem, | |
4197 | int event, u16 flags) | |
d60ce62f | 4198 | { |
128ad332 PNA |
4199 | struct net *net = ctx->net; |
4200 | u32 portid = ctx->portid; | |
d60ce62f AB |
4201 | struct sk_buff *skb; |
4202 | int err; | |
4203 | ||
128ad332 | 4204 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
25e94a99 | 4205 | return; |
d60ce62f | 4206 | |
d60ce62f AB |
4207 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
4208 | if (skb == NULL) | |
4209 | goto err; | |
4210 | ||
4211 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
4212 | set, elem); | |
4213 | if (err < 0) { | |
4214 | kfree_skb(skb); | |
4215 | goto err; | |
4216 | } | |
4217 | ||
25e94a99 PNA |
4218 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
4219 | GFP_KERNEL); | |
4220 | return; | |
d60ce62f | 4221 | err: |
25e94a99 | 4222 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
d60ce62f AB |
4223 | } |
4224 | ||
60319eb1 PNA |
4225 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
4226 | int msg_type, | |
4227 | struct nft_set *set) | |
4228 | { | |
4229 | struct nft_trans *trans; | |
4230 | ||
4231 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
4232 | if (trans == NULL) | |
4233 | return NULL; | |
4234 | ||
4235 | nft_trans_elem_set(trans) = set; | |
4236 | return trans; | |
4237 | } | |
4238 | ||
22fe54d5 PM |
4239 | void *nft_set_elem_init(const struct nft_set *set, |
4240 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 4241 | const u32 *key, const u32 *data, |
22fe54d5 | 4242 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
4243 | { |
4244 | struct nft_set_ext *ext; | |
4245 | void *elem; | |
4246 | ||
4247 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
4248 | if (elem == NULL) | |
4249 | return NULL; | |
4250 | ||
4251 | ext = nft_set_elem_ext(set, elem); | |
4252 | nft_set_ext_init(ext, tmpl); | |
4253 | ||
4254 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
4255 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4256 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
4257 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
4258 | *nft_set_ext_expiration(ext) = | |
8e1102d5 | 4259 | get_jiffies_64() + timeout; |
c3e1b005 PM |
4260 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) |
4261 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
4262 | |
4263 | return elem; | |
4264 | } | |
4265 | ||
61f9e292 LZ |
4266 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
4267 | bool destroy_expr) | |
61edafbb PM |
4268 | { |
4269 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3453c927 PNA |
4270 | struct nft_ctx ctx = { |
4271 | .net = read_pnet(&set->net), | |
4272 | .family = set->table->family, | |
4273 | }; | |
61edafbb | 4274 | |
59105446 | 4275 | nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); |
61edafbb | 4276 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) |
59105446 | 4277 | nft_data_release(nft_set_ext_data(ext), set->dtype); |
371ebcbb PNA |
4278 | if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) { |
4279 | struct nft_expr *expr = nft_set_ext_expr(ext); | |
4280 | ||
4281 | if (expr->ops->destroy_clone) { | |
4282 | expr->ops->destroy_clone(&ctx, expr); | |
4283 | module_put(expr->ops->type->owner); | |
4284 | } else { | |
4285 | nf_tables_expr_destroy(&ctx, expr); | |
4286 | } | |
4287 | } | |
8aeff920 PNA |
4288 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) |
4289 | (*nft_set_ext_obj(ext))->use--; | |
61edafbb PM |
4290 | kfree(elem); |
4291 | } | |
4292 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
4293 | ||
59105446 PNA |
4294 | /* Only called from commit path, nft_set_elem_deactivate() already deals with |
4295 | * the refcounting from the preparation phase. | |
4296 | */ | |
3453c927 PNA |
4297 | static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, |
4298 | const struct nft_set *set, void *elem) | |
59105446 PNA |
4299 | { |
4300 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
4301 | ||
4302 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) | |
3453c927 | 4303 | nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext)); |
59105446 PNA |
4304 | kfree(elem); |
4305 | } | |
4306 | ||
60319eb1 | 4307 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
c016c7e4 | 4308 | const struct nlattr *attr, u32 nlmsg_flags) |
20a69341 PM |
4309 | { |
4310 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
8aeff920 | 4311 | u8 genmask = nft_genmask_next(ctx->net); |
20a69341 | 4312 | struct nft_data_desc d1, d2; |
fe2811eb | 4313 | struct nft_set_ext_tmpl tmpl; |
c016c7e4 | 4314 | struct nft_set_ext *ext, *ext2; |
20a69341 PM |
4315 | struct nft_set_elem elem; |
4316 | struct nft_set_binding *binding; | |
8aeff920 | 4317 | struct nft_object *obj = NULL; |
68e942e8 | 4318 | struct nft_userdata *udata; |
fe2811eb | 4319 | struct nft_data data; |
20a69341 | 4320 | enum nft_registers dreg; |
60319eb1 | 4321 | struct nft_trans *trans; |
0e9091d6 | 4322 | u32 flags = 0; |
c3e1b005 | 4323 | u64 timeout; |
68e942e8 | 4324 | u8 ulen; |
20a69341 PM |
4325 | int err; |
4326 | ||
4327 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 4328 | nft_set_elem_policy, NULL); |
20a69341 PM |
4329 | if (err < 0) |
4330 | return err; | |
4331 | ||
4332 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
4333 | return -EINVAL; | |
4334 | ||
fe2811eb PM |
4335 | nft_set_ext_prepare(&tmpl); |
4336 | ||
0e9091d6 PNA |
4337 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); |
4338 | if (err < 0) | |
4339 | return err; | |
4340 | if (flags != 0) | |
4341 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
4342 | |
4343 | if (set->flags & NFT_SET_MAP) { | |
4344 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 4345 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 4346 | return -EINVAL; |
bd7fc645 | 4347 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 4348 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 4349 | return -EINVAL; |
20a69341 PM |
4350 | } else { |
4351 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
4352 | return -EINVAL; | |
4353 | } | |
4354 | ||
c3e1b005 PM |
4355 | timeout = 0; |
4356 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
4357 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
4358 | return -EINVAL; | |
8e1102d5 FW |
4359 | err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT], |
4360 | &timeout); | |
4361 | if (err) | |
4362 | return err; | |
c3e1b005 PM |
4363 | } else if (set->flags & NFT_SET_TIMEOUT) { |
4364 | timeout = set->timeout; | |
4365 | } | |
4366 | ||
7d740264 | 4367 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 4368 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
4369 | if (err < 0) |
4370 | goto err1; | |
4371 | err = -EINVAL; | |
4372 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
4373 | goto err2; | |
4374 | ||
7d740264 | 4375 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
4376 | if (timeout > 0) { |
4377 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
4378 | if (timeout != set->timeout) | |
4379 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
4380 | } | |
fe2811eb | 4381 | |
8aeff920 PNA |
4382 | if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { |
4383 | if (!(set->flags & NFT_SET_OBJECT)) { | |
4384 | err = -EINVAL; | |
4385 | goto err2; | |
4386 | } | |
cac20fcd PNA |
4387 | obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF], |
4388 | set->objtype, genmask); | |
8aeff920 PNA |
4389 | if (IS_ERR(obj)) { |
4390 | err = PTR_ERR(obj); | |
4391 | goto err2; | |
4392 | } | |
4393 | nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); | |
4394 | } | |
4395 | ||
20a69341 | 4396 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
4397 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
4398 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
4399 | if (err < 0) |
4400 | goto err2; | |
4401 | ||
4402 | err = -EINVAL; | |
4403 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
4404 | goto err3; | |
4405 | ||
4406 | dreg = nft_type_to_reg(set->dtype); | |
4407 | list_for_each_entry(binding, &set->bindings, list) { | |
4408 | struct nft_ctx bind_ctx = { | |
58c78e10 | 4409 | .net = ctx->net, |
36596dad | 4410 | .family = ctx->family, |
20a69341 | 4411 | .table = ctx->table, |
7c95f6d8 | 4412 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
4413 | }; |
4414 | ||
11113e19 PM |
4415 | if (!(binding->flags & NFT_SET_MAP)) |
4416 | continue; | |
4417 | ||
1ec10212 PM |
4418 | err = nft_validate_register_store(&bind_ctx, dreg, |
4419 | &data, | |
4420 | d2.type, d2.len); | |
20a69341 PM |
4421 | if (err < 0) |
4422 | goto err3; | |
a654de8f PNA |
4423 | |
4424 | if (d2.type == NFT_DATA_VERDICT && | |
4425 | (data.verdict.code == NFT_GOTO || | |
4426 | data.verdict.code == NFT_JUMP)) | |
4427 | nft_validate_state_update(ctx->net, | |
4428 | NFT_VALIDATE_NEED); | |
20a69341 | 4429 | } |
fe2811eb | 4430 | |
7d740264 | 4431 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
4432 | } |
4433 | ||
68e942e8 PM |
4434 | /* The full maximum length of userdata can exceed the maximum |
4435 | * offset value (U8_MAX) for following extensions, therefor it | |
4436 | * must be the last extension added. | |
4437 | */ | |
4438 | ulen = 0; | |
4439 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
4440 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
4441 | if (ulen > 0) | |
4442 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
4443 | ulen); | |
4444 | } | |
4445 | ||
fe2811eb | 4446 | err = -ENOMEM; |
7d740264 | 4447 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 4448 | timeout, GFP_KERNEL); |
fe2811eb PM |
4449 | if (elem.priv == NULL) |
4450 | goto err3; | |
4451 | ||
4452 | ext = nft_set_elem_ext(set, elem.priv); | |
4453 | if (flags) | |
4454 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
4455 | if (ulen > 0) { |
4456 | udata = nft_set_ext_userdata(ext); | |
4457 | udata->len = ulen - 1; | |
4458 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
4459 | } | |
8aeff920 PNA |
4460 | if (obj) { |
4461 | *nft_set_ext_obj(ext) = obj; | |
4462 | obj->use++; | |
4463 | } | |
fe2811eb | 4464 | |
60319eb1 PNA |
4465 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
4466 | if (trans == NULL) | |
fe2811eb | 4467 | goto err4; |
60319eb1 | 4468 | |
69086658 | 4469 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
c016c7e4 PNA |
4470 | err = set->ops->insert(ctx->net, set, &elem, &ext2); |
4471 | if (err) { | |
4472 | if (err == -EEXIST) { | |
9744a6fc PNA |
4473 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ |
4474 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || | |
4475 | nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ | |
f0dfd7a2 CIK |
4476 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) { |
4477 | err = -EBUSY; | |
4478 | goto err5; | |
4479 | } | |
8aeff920 PNA |
4480 | if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
4481 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && | |
4482 | memcmp(nft_set_ext_data(ext), | |
4483 | nft_set_ext_data(ext2), set->dlen) != 0) || | |
4484 | (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && | |
4485 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && | |
4486 | *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) | |
c016c7e4 PNA |
4487 | err = -EBUSY; |
4488 | else if (!(nlmsg_flags & NLM_F_EXCL)) | |
4489 | err = 0; | |
4490 | } | |
fe2811eb | 4491 | goto err5; |
c016c7e4 | 4492 | } |
20a69341 | 4493 | |
35d0ac90 PNA |
4494 | if (set->size && |
4495 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { | |
4496 | err = -ENFILE; | |
4497 | goto err6; | |
4498 | } | |
4499 | ||
60319eb1 | 4500 | nft_trans_elem(trans) = elem; |
46bbafce | 4501 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
4502 | return 0; |
4503 | ||
35d0ac90 | 4504 | err6: |
5cb82a38 | 4505 | set->ops->remove(ctx->net, set, &elem); |
fe2811eb | 4506 | err5: |
60319eb1 | 4507 | kfree(trans); |
fe2811eb PM |
4508 | err4: |
4509 | kfree(elem.priv); | |
20a69341 PM |
4510 | err3: |
4511 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
59105446 | 4512 | nft_data_release(&data, d2.type); |
20a69341 | 4513 | err2: |
59105446 | 4514 | nft_data_release(&elem.key.val, d1.type); |
20a69341 PM |
4515 | err1: |
4516 | return err; | |
4517 | } | |
4518 | ||
633c9a84 PNA |
4519 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
4520 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4521 | const struct nlattr * const nla[], |
4522 | struct netlink_ext_ack *extack) | |
20a69341 | 4523 | { |
f2a6d766 | 4524 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4525 | const struct nlattr *attr; |
4526 | struct nft_set *set; | |
4527 | struct nft_ctx ctx; | |
a654de8f | 4528 | int rem, err; |
20a69341 | 4529 | |
7d5570ca PNA |
4530 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
4531 | return -EINVAL; | |
4532 | ||
36dd1bcc PNA |
4533 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack, |
4534 | genmask); | |
20a69341 PM |
4535 | if (err < 0) |
4536 | return err; | |
4537 | ||
a3073c17 PNA |
4538 | set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
4539 | nla[NFTA_SET_ELEM_LIST_SET_ID], genmask); | |
4540 | if (IS_ERR(set)) | |
4541 | return PTR_ERR(set); | |
958bee14 | 4542 | |
20a69341 PM |
4543 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
4544 | return -EBUSY; | |
4545 | ||
4546 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
c016c7e4 | 4547 | err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags); |
35d0ac90 | 4548 | if (err < 0) |
a654de8f | 4549 | return err; |
20a69341 | 4550 | } |
a654de8f PNA |
4551 | |
4552 | if (net->nft.validate_state == NFT_VALIDATE_DO) | |
4553 | return nft_table_validate(net, ctx.table); | |
4554 | ||
4555 | return 0; | |
20a69341 PM |
4556 | } |
4557 | ||
59105446 PNA |
4558 | /** |
4559 | * nft_data_hold - hold a nft_data item | |
4560 | * | |
4561 | * @data: struct nft_data to release | |
4562 | * @type: type of data | |
4563 | * | |
4564 | * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
4565 | * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and | |
4566 | * NFT_GOTO verdicts. This function must be called on active data objects | |
4567 | * from the second phase of the commit protocol. | |
4568 | */ | |
bb7b40ae | 4569 | void nft_data_hold(const struct nft_data *data, enum nft_data_types type) |
59105446 PNA |
4570 | { |
4571 | if (type == NFT_DATA_VERDICT) { | |
4572 | switch (data->verdict.code) { | |
4573 | case NFT_JUMP: | |
4574 | case NFT_GOTO: | |
4575 | data->verdict.chain->use++; | |
4576 | break; | |
4577 | } | |
4578 | } | |
4579 | } | |
4580 | ||
4581 | static void nft_set_elem_activate(const struct net *net, | |
4582 | const struct nft_set *set, | |
4583 | struct nft_set_elem *elem) | |
4584 | { | |
4585 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4586 | ||
4587 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4588 | nft_data_hold(nft_set_ext_data(ext), set->dtype); | |
4589 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4590 | (*nft_set_ext_obj(ext))->use++; | |
4591 | } | |
4592 | ||
4593 | static void nft_set_elem_deactivate(const struct net *net, | |
4594 | const struct nft_set *set, | |
4595 | struct nft_set_elem *elem) | |
4596 | { | |
4597 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4598 | ||
4599 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4600 | nft_data_release(nft_set_ext_data(ext), set->dtype); | |
4601 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4602 | (*nft_set_ext_obj(ext))->use--; | |
4603 | } | |
4604 | ||
60319eb1 | 4605 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
4606 | const struct nlattr *attr) |
4607 | { | |
4608 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3971ca14 | 4609 | struct nft_set_ext_tmpl tmpl; |
20a69341 PM |
4610 | struct nft_data_desc desc; |
4611 | struct nft_set_elem elem; | |
3971ca14 | 4612 | struct nft_set_ext *ext; |
60319eb1 | 4613 | struct nft_trans *trans; |
3971ca14 PNA |
4614 | u32 flags = 0; |
4615 | void *priv; | |
20a69341 PM |
4616 | int err; |
4617 | ||
4618 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 4619 | nft_set_elem_policy, NULL); |
20a69341 PM |
4620 | if (err < 0) |
4621 | goto err1; | |
4622 | ||
4623 | err = -EINVAL; | |
4624 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
4625 | goto err1; | |
4626 | ||
3971ca14 PNA |
4627 | nft_set_ext_prepare(&tmpl); |
4628 | ||
4629 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
4630 | if (err < 0) | |
4631 | return err; | |
4632 | if (flags != 0) | |
4633 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
4634 | ||
7d740264 | 4635 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 4636 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
4637 | if (err < 0) |
4638 | goto err1; | |
4639 | ||
4640 | err = -EINVAL; | |
4641 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
4642 | goto err2; | |
4643 | ||
3971ca14 PNA |
4644 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len); |
4645 | ||
4646 | err = -ENOMEM; | |
4647 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0, | |
4648 | GFP_KERNEL); | |
4649 | if (elem.priv == NULL) | |
4650 | goto err2; | |
4651 | ||
4652 | ext = nft_set_elem_ext(set, elem.priv); | |
4653 | if (flags) | |
4654 | *nft_set_ext_flags(ext) = flags; | |
4655 | ||
60319eb1 | 4656 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
4657 | if (trans == NULL) { |
4658 | err = -ENOMEM; | |
3971ca14 | 4659 | goto err3; |
609ccf08 | 4660 | } |
20a69341 | 4661 | |
42a55769 | 4662 | priv = set->ops->deactivate(ctx->net, set, &elem); |
3971ca14 | 4663 | if (priv == NULL) { |
cc02e457 | 4664 | err = -ENOENT; |
3971ca14 | 4665 | goto err4; |
cc02e457 | 4666 | } |
3971ca14 PNA |
4667 | kfree(elem.priv); |
4668 | elem.priv = priv; | |
cc02e457 | 4669 | |
59105446 PNA |
4670 | nft_set_elem_deactivate(ctx->net, set, &elem); |
4671 | ||
60319eb1 | 4672 | nft_trans_elem(trans) = elem; |
46bbafce | 4673 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 4674 | return 0; |
cc02e457 | 4675 | |
3971ca14 | 4676 | err4: |
cc02e457 | 4677 | kfree(trans); |
3971ca14 PNA |
4678 | err3: |
4679 | kfree(elem.priv); | |
20a69341 | 4680 | err2: |
59105446 | 4681 | nft_data_release(&elem.key.val, desc.type); |
20a69341 PM |
4682 | err1: |
4683 | return err; | |
4684 | } | |
4685 | ||
8411b644 | 4686 | static int nft_flush_set(const struct nft_ctx *ctx, |
de70185d | 4687 | struct nft_set *set, |
8411b644 | 4688 | const struct nft_set_iter *iter, |
de70185d | 4689 | struct nft_set_elem *elem) |
8411b644 PNA |
4690 | { |
4691 | struct nft_trans *trans; | |
4692 | int err; | |
4693 | ||
4694 | trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, | |
4695 | sizeof(struct nft_trans_elem), GFP_ATOMIC); | |
4696 | if (!trans) | |
4697 | return -ENOMEM; | |
4698 | ||
1ba1c414 | 4699 | if (!set->ops->flush(ctx->net, set, elem->priv)) { |
8411b644 PNA |
4700 | err = -ENOENT; |
4701 | goto err1; | |
4702 | } | |
b2c11e4b | 4703 | set->ndeact++; |
8411b644 | 4704 | |
7acfda53 | 4705 | nft_set_elem_deactivate(ctx->net, set, elem); |
de70185d PNA |
4706 | nft_trans_elem_set(trans) = set; |
4707 | nft_trans_elem(trans) = *elem; | |
8411b644 PNA |
4708 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
4709 | ||
4710 | return 0; | |
4711 | err1: | |
4712 | kfree(trans); | |
4713 | return err; | |
4714 | } | |
4715 | ||
633c9a84 PNA |
4716 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
4717 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4718 | const struct nlattr * const nla[], |
4719 | struct netlink_ext_ack *extack) | |
20a69341 | 4720 | { |
f2a6d766 | 4721 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4722 | const struct nlattr *attr; |
4723 | struct nft_set *set; | |
4724 | struct nft_ctx ctx; | |
60319eb1 | 4725 | int rem, err = 0; |
20a69341 | 4726 | |
36dd1bcc PNA |
4727 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack, |
4728 | genmask); | |
20a69341 PM |
4729 | if (err < 0) |
4730 | return err; | |
4731 | ||
cac20fcd | 4732 | set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask); |
20a69341 PM |
4733 | if (IS_ERR(set)) |
4734 | return PTR_ERR(set); | |
4735 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
4736 | return -EBUSY; | |
4737 | ||
8411b644 | 4738 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) { |
baa2d42c PNA |
4739 | struct nft_set_iter iter = { |
4740 | .genmask = genmask, | |
4741 | .fn = nft_flush_set, | |
8411b644 | 4742 | }; |
baa2d42c | 4743 | set->ops->walk(&ctx, set, &iter); |
8411b644 | 4744 | |
baa2d42c | 4745 | return iter.err; |
8411b644 PNA |
4746 | } |
4747 | ||
20a69341 PM |
4748 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
4749 | err = nft_del_setelem(&ctx, set, attr); | |
4750 | if (err < 0) | |
60319eb1 | 4751 | break; |
4fefee57 | 4752 | |
3dd0673a | 4753 | set->ndeact++; |
20a69341 | 4754 | } |
60319eb1 | 4755 | return err; |
20a69341 PM |
4756 | } |
4757 | ||
cfed7e1b PM |
4758 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
4759 | { | |
4760 | struct nft_set_gc_batch *gcb; | |
4761 | unsigned int i; | |
4762 | ||
4763 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
4764 | for (i = 0; i < gcb->head.cnt; i++) | |
61f9e292 | 4765 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); |
cfed7e1b PM |
4766 | kfree(gcb); |
4767 | } | |
4768 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
4769 | ||
4770 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
4771 | gfp_t gfp) | |
4772 | { | |
4773 | struct nft_set_gc_batch *gcb; | |
4774 | ||
4775 | gcb = kzalloc(sizeof(*gcb), gfp); | |
4776 | if (gcb == NULL) | |
4777 | return gcb; | |
4778 | gcb->head.set = set; | |
4779 | return gcb; | |
4780 | } | |
4781 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
4782 | ||
e5009240 PNA |
4783 | /* |
4784 | * Stateful objects | |
4785 | */ | |
4786 | ||
4787 | /** | |
4788 | * nft_register_obj- register nf_tables stateful object type | |
4789 | * @obj: object type | |
4790 | * | |
4791 | * Registers the object type for use with nf_tables. Returns zero on | |
4792 | * success or a negative errno code otherwise. | |
4793 | */ | |
4794 | int nft_register_obj(struct nft_object_type *obj_type) | |
4795 | { | |
4796 | if (obj_type->type == NFT_OBJECT_UNSPEC) | |
4797 | return -EINVAL; | |
4798 | ||
4799 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4800 | list_add_rcu(&obj_type->list, &nf_tables_objects); | |
4801 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4802 | return 0; | |
4803 | } | |
4804 | EXPORT_SYMBOL_GPL(nft_register_obj); | |
4805 | ||
4806 | /** | |
4807 | * nft_unregister_obj - unregister nf_tables object type | |
4808 | * @obj: object type | |
4809 | * | |
4810 | * Unregisters the object type for use with nf_tables. | |
4811 | */ | |
4812 | void nft_unregister_obj(struct nft_object_type *obj_type) | |
4813 | { | |
4814 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4815 | list_del_rcu(&obj_type->list); | |
4816 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4817 | } | |
4818 | EXPORT_SYMBOL_GPL(nft_unregister_obj); | |
4819 | ||
cac20fcd PNA |
4820 | struct nft_object *nft_obj_lookup(const struct nft_table *table, |
4821 | const struct nlattr *nla, u32 objtype, | |
4822 | u8 genmask) | |
e5009240 PNA |
4823 | { |
4824 | struct nft_object *obj; | |
4825 | ||
d9adf22a | 4826 | list_for_each_entry_rcu(obj, &table->objects, list) { |
e5009240 | 4827 | if (!nla_strcmp(nla, obj->name) && |
dfc46034 | 4828 | objtype == obj->ops->type->type && |
e5009240 PNA |
4829 | nft_active_genmask(obj, genmask)) |
4830 | return obj; | |
4831 | } | |
4832 | return ERR_PTR(-ENOENT); | |
4833 | } | |
cac20fcd | 4834 | EXPORT_SYMBOL_GPL(nft_obj_lookup); |
e5009240 | 4835 | |
cac20fcd PNA |
4836 | static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table, |
4837 | const struct nlattr *nla, | |
4838 | u32 objtype, u8 genmask) | |
3ecbfd65 HS |
4839 | { |
4840 | struct nft_object *obj; | |
4841 | ||
4842 | list_for_each_entry(obj, &table->objects, list) { | |
4843 | if (be64_to_cpu(nla_get_be64(nla)) == obj->handle && | |
4844 | objtype == obj->ops->type->type && | |
4845 | nft_active_genmask(obj, genmask)) | |
4846 | return obj; | |
4847 | } | |
4848 | return ERR_PTR(-ENOENT); | |
4849 | } | |
4850 | ||
e5009240 | 4851 | static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { |
b2fbd044 LZ |
4852 | [NFTA_OBJ_TABLE] = { .type = NLA_STRING, |
4853 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
4854 | [NFTA_OBJ_NAME] = { .type = NLA_STRING, | |
4855 | .len = NFT_OBJ_MAXNAMELEN - 1 }, | |
e5009240 PNA |
4856 | [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, |
4857 | [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, | |
3ecbfd65 | 4858 | [NFTA_OBJ_HANDLE] = { .type = NLA_U64}, |
e5009240 PNA |
4859 | }; |
4860 | ||
84fba055 FW |
4861 | static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, |
4862 | const struct nft_object_type *type, | |
e5009240 PNA |
4863 | const struct nlattr *attr) |
4864 | { | |
5b4c6e38 | 4865 | struct nlattr **tb; |
dfc46034 | 4866 | const struct nft_object_ops *ops; |
e5009240 | 4867 | struct nft_object *obj; |
5b4c6e38 GS |
4868 | int err = -ENOMEM; |
4869 | ||
4870 | tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL); | |
4871 | if (!tb) | |
4872 | goto err1; | |
e5009240 PNA |
4873 | |
4874 | if (attr) { | |
fceb6435 JB |
4875 | err = nla_parse_nested(tb, type->maxattr, attr, type->policy, |
4876 | NULL); | |
e5009240 | 4877 | if (err < 0) |
5b4c6e38 | 4878 | goto err2; |
e5009240 PNA |
4879 | } else { |
4880 | memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); | |
4881 | } | |
4882 | ||
dfc46034 PBG |
4883 | if (type->select_ops) { |
4884 | ops = type->select_ops(ctx, (const struct nlattr * const *)tb); | |
4885 | if (IS_ERR(ops)) { | |
4886 | err = PTR_ERR(ops); | |
5b4c6e38 | 4887 | goto err2; |
dfc46034 PBG |
4888 | } |
4889 | } else { | |
4890 | ops = type->ops; | |
4891 | } | |
4892 | ||
e5009240 | 4893 | err = -ENOMEM; |
dfc46034 | 4894 | obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL); |
5b4c6e38 GS |
4895 | if (!obj) |
4896 | goto err2; | |
e5009240 | 4897 | |
dfc46034 | 4898 | err = ops->init(ctx, (const struct nlattr * const *)tb, obj); |
e5009240 | 4899 | if (err < 0) |
5b4c6e38 | 4900 | goto err3; |
e5009240 | 4901 | |
dfc46034 PBG |
4902 | obj->ops = ops; |
4903 | ||
5b4c6e38 | 4904 | kfree(tb); |
e5009240 | 4905 | return obj; |
5b4c6e38 | 4906 | err3: |
e5009240 | 4907 | kfree(obj); |
5b4c6e38 GS |
4908 | err2: |
4909 | kfree(tb); | |
e5009240 PNA |
4910 | err1: |
4911 | return ERR_PTR(err); | |
4912 | } | |
4913 | ||
4914 | static int nft_object_dump(struct sk_buff *skb, unsigned int attr, | |
43da04a5 | 4915 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4916 | { |
4917 | struct nlattr *nest; | |
4918 | ||
4919 | nest = nla_nest_start(skb, attr); | |
4920 | if (!nest) | |
4921 | goto nla_put_failure; | |
dfc46034 | 4922 | if (obj->ops->dump(skb, obj, reset) < 0) |
e5009240 PNA |
4923 | goto nla_put_failure; |
4924 | nla_nest_end(skb, nest); | |
4925 | return 0; | |
4926 | ||
4927 | nla_put_failure: | |
4928 | return -1; | |
4929 | } | |
4930 | ||
4931 | static const struct nft_object_type *__nft_obj_type_get(u32 objtype) | |
4932 | { | |
4933 | const struct nft_object_type *type; | |
4934 | ||
4935 | list_for_each_entry(type, &nf_tables_objects, list) { | |
4936 | if (objtype == type->type) | |
4937 | return type; | |
4938 | } | |
4939 | return NULL; | |
4940 | } | |
4941 | ||
452238e8 FW |
4942 | static const struct nft_object_type * |
4943 | nft_obj_type_get(struct net *net, u32 objtype) | |
e5009240 PNA |
4944 | { |
4945 | const struct nft_object_type *type; | |
4946 | ||
4947 | type = __nft_obj_type_get(objtype); | |
4948 | if (type != NULL && try_module_get(type->owner)) | |
4949 | return type; | |
4950 | ||
f102d66b | 4951 | lockdep_nfnl_nft_mutex_not_held(); |
e5009240 PNA |
4952 | #ifdef CONFIG_MODULES |
4953 | if (type == NULL) { | |
452238e8 | 4954 | nft_request_module(net, "nft-obj-%u", objtype); |
e5009240 PNA |
4955 | if (__nft_obj_type_get(objtype)) |
4956 | return ERR_PTR(-EAGAIN); | |
4957 | } | |
4958 | #endif | |
4959 | return ERR_PTR(-ENOENT); | |
4960 | } | |
4961 | ||
4962 | static int nf_tables_newobj(struct net *net, struct sock *nlsk, | |
4963 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4964 | const struct nlattr * const nla[], |
4965 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4966 | { |
4967 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4968 | const struct nft_object_type *type; | |
4969 | u8 genmask = nft_genmask_next(net); | |
4970 | int family = nfmsg->nfgen_family; | |
e5009240 PNA |
4971 | struct nft_table *table; |
4972 | struct nft_object *obj; | |
4973 | struct nft_ctx ctx; | |
4974 | u32 objtype; | |
4975 | int err; | |
4976 | ||
4977 | if (!nla[NFTA_OBJ_TYPE] || | |
4978 | !nla[NFTA_OBJ_NAME] || | |
4979 | !nla[NFTA_OBJ_DATA]) | |
4980 | return -EINVAL; | |
4981 | ||
cac20fcd | 4982 | table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask); |
36dd1bcc PNA |
4983 | if (IS_ERR(table)) { |
4984 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); | |
e5009240 | 4985 | return PTR_ERR(table); |
36dd1bcc | 4986 | } |
e5009240 PNA |
4987 | |
4988 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
cac20fcd | 4989 | obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); |
e5009240 PNA |
4990 | if (IS_ERR(obj)) { |
4991 | err = PTR_ERR(obj); | |
36dd1bcc PNA |
4992 | if (err != -ENOENT) { |
4993 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); | |
e5009240 | 4994 | return err; |
36dd1bcc | 4995 | } |
1a28ad74 | 4996 | } else { |
36dd1bcc PNA |
4997 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
4998 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); | |
e5009240 | 4999 | return -EEXIST; |
36dd1bcc | 5000 | } |
e5009240 PNA |
5001 | return 0; |
5002 | } | |
5003 | ||
98319cb9 | 5004 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e5009240 | 5005 | |
452238e8 | 5006 | type = nft_obj_type_get(net, objtype); |
e5009240 PNA |
5007 | if (IS_ERR(type)) |
5008 | return PTR_ERR(type); | |
5009 | ||
84fba055 | 5010 | obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); |
e5009240 PNA |
5011 | if (IS_ERR(obj)) { |
5012 | err = PTR_ERR(obj); | |
5013 | goto err1; | |
5014 | } | |
18965317 | 5015 | obj->table = table; |
3ecbfd65 HS |
5016 | obj->handle = nf_tables_alloc_handle(table); |
5017 | ||
61509575 PS |
5018 | obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL); |
5019 | if (!obj->name) { | |
5020 | err = -ENOMEM; | |
5021 | goto err2; | |
5022 | } | |
e5009240 PNA |
5023 | |
5024 | err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); | |
5025 | if (err < 0) | |
61509575 | 5026 | goto err3; |
e5009240 PNA |
5027 | |
5028 | list_add_tail_rcu(&obj->list, &table->objects); | |
5029 | table->use++; | |
5030 | return 0; | |
61509575 PS |
5031 | err3: |
5032 | kfree(obj->name); | |
e5009240 | 5033 | err2: |
dfc46034 | 5034 | if (obj->ops->destroy) |
00bfb320 | 5035 | obj->ops->destroy(&ctx, obj); |
e5009240 PNA |
5036 | kfree(obj); |
5037 | err1: | |
5038 | module_put(type->owner); | |
5039 | return err; | |
5040 | } | |
5041 | ||
5042 | static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, | |
5043 | u32 portid, u32 seq, int event, u32 flags, | |
5044 | int family, const struct nft_table *table, | |
43da04a5 | 5045 | struct nft_object *obj, bool reset) |
e5009240 PNA |
5046 | { |
5047 | struct nfgenmsg *nfmsg; | |
5048 | struct nlmsghdr *nlh; | |
5049 | ||
dedb67c4 | 5050 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
e5009240 PNA |
5051 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
5052 | if (nlh == NULL) | |
5053 | goto nla_put_failure; | |
5054 | ||
5055 | nfmsg = nlmsg_data(nlh); | |
5056 | nfmsg->nfgen_family = family; | |
5057 | nfmsg->version = NFNETLINK_V0; | |
5058 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
5059 | ||
5060 | if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || | |
5061 | nla_put_string(skb, NFTA_OBJ_NAME, obj->name) || | |
dfc46034 | 5062 | nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) || |
e5009240 | 5063 | nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || |
3ecbfd65 HS |
5064 | nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) || |
5065 | nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle), | |
5066 | NFTA_OBJ_PAD)) | |
e5009240 PNA |
5067 | goto nla_put_failure; |
5068 | ||
5069 | nlmsg_end(skb, nlh); | |
5070 | return 0; | |
5071 | ||
5072 | nla_put_failure: | |
5073 | nlmsg_trim(skb, nlh); | |
5074 | return -1; | |
5075 | } | |
5076 | ||
a9fea2a3 | 5077 | struct nft_obj_filter { |
e46abbcc | 5078 | char *table; |
a9fea2a3 PNA |
5079 | u32 type; |
5080 | }; | |
5081 | ||
e5009240 PNA |
5082 | static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) |
5083 | { | |
5084 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
e5009240 | 5085 | const struct nft_table *table; |
e5009240 | 5086 | unsigned int idx = 0, s_idx = cb->args[0]; |
a9fea2a3 | 5087 | struct nft_obj_filter *filter = cb->data; |
e5009240 PNA |
5088 | struct net *net = sock_net(skb->sk); |
5089 | int family = nfmsg->nfgen_family; | |
43da04a5 PNA |
5090 | struct nft_object *obj; |
5091 | bool reset = false; | |
5092 | ||
5093 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) | |
5094 | reset = true; | |
e5009240 PNA |
5095 | |
5096 | rcu_read_lock(); | |
5097 | cb->seq = net->nft.base_seq; | |
5098 | ||
36596dad | 5099 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 5100 | if (family != NFPROTO_UNSPEC && family != table->family) |
e5009240 PNA |
5101 | continue; |
5102 | ||
36596dad PNA |
5103 | list_for_each_entry_rcu(obj, &table->objects, list) { |
5104 | if (!nft_is_active(net, obj)) | |
5105 | goto cont; | |
5106 | if (idx < s_idx) | |
5107 | goto cont; | |
5108 | if (idx > s_idx) | |
5109 | memset(&cb->args[1], 0, | |
5110 | sizeof(cb->args) - sizeof(cb->args[0])); | |
360cc79d | 5111 | if (filter && filter->table && |
36596dad PNA |
5112 | strcmp(filter->table, table->name)) |
5113 | goto cont; | |
5114 | if (filter && | |
5115 | filter->type != NFT_OBJECT_UNSPEC && | |
5116 | obj->ops->type->type != filter->type) | |
5117 | goto cont; | |
a9fea2a3 | 5118 | |
36596dad PNA |
5119 | if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, |
5120 | cb->nlh->nlmsg_seq, | |
5121 | NFT_MSG_NEWOBJ, | |
5122 | NLM_F_MULTI | NLM_F_APPEND, | |
98319cb9 | 5123 | table->family, table, |
36596dad PNA |
5124 | obj, reset) < 0) |
5125 | goto done; | |
e5009240 | 5126 | |
36596dad | 5127 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
e5009240 | 5128 | cont: |
36596dad | 5129 | idx++; |
e5009240 PNA |
5130 | } |
5131 | } | |
5132 | done: | |
5133 | rcu_read_unlock(); | |
5134 | ||
5135 | cb->args[0] = idx; | |
5136 | return skb->len; | |
5137 | } | |
5138 | ||
90fd131a | 5139 | static int nf_tables_dump_obj_start(struct netlink_callback *cb) |
a9fea2a3 | 5140 | { |
90fd131a FW |
5141 | const struct nlattr * const *nla = cb->data; |
5142 | struct nft_obj_filter *filter = NULL; | |
e46abbcc | 5143 | |
90fd131a FW |
5144 | if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) { |
5145 | filter = kzalloc(sizeof(*filter), GFP_ATOMIC); | |
5146 | if (!filter) | |
5147 | return -ENOMEM; | |
5148 | ||
5149 | if (nla[NFTA_OBJ_TABLE]) { | |
5150 | filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC); | |
5151 | if (!filter->table) { | |
5152 | kfree(filter); | |
5153 | return -ENOMEM; | |
5154 | } | |
5155 | } | |
5156 | ||
5157 | if (nla[NFTA_OBJ_TYPE]) | |
5158 | filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
8bea728d | 5159 | } |
a9fea2a3 | 5160 | |
90fd131a | 5161 | cb->data = filter; |
a9fea2a3 PNA |
5162 | return 0; |
5163 | } | |
5164 | ||
90fd131a | 5165 | static int nf_tables_dump_obj_done(struct netlink_callback *cb) |
a9fea2a3 | 5166 | { |
90fd131a | 5167 | struct nft_obj_filter *filter = cb->data; |
a9fea2a3 | 5168 | |
90fd131a FW |
5169 | if (filter) { |
5170 | kfree(filter->table); | |
5171 | kfree(filter); | |
e46abbcc | 5172 | } |
a9fea2a3 | 5173 | |
90fd131a | 5174 | return 0; |
a9fea2a3 PNA |
5175 | } |
5176 | ||
d9adf22a | 5177 | /* called with rcu_read_lock held */ |
e5009240 PNA |
5178 | static int nf_tables_getobj(struct net *net, struct sock *nlsk, |
5179 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
5180 | const struct nlattr * const nla[], |
5181 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
5182 | { |
5183 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5184 | u8 genmask = nft_genmask_cur(net); | |
5185 | int family = nfmsg->nfgen_family; | |
e5009240 PNA |
5186 | const struct nft_table *table; |
5187 | struct nft_object *obj; | |
5188 | struct sk_buff *skb2; | |
43da04a5 | 5189 | bool reset = false; |
e5009240 PNA |
5190 | u32 objtype; |
5191 | int err; | |
5192 | ||
5193 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
5194 | struct netlink_dump_control c = { | |
90fd131a | 5195 | .start = nf_tables_dump_obj_start, |
e5009240 | 5196 | .dump = nf_tables_dump_obj, |
a9fea2a3 | 5197 | .done = nf_tables_dump_obj_done, |
d9adf22a | 5198 | .module = THIS_MODULE, |
90fd131a | 5199 | .data = (void *)nla, |
e5009240 | 5200 | }; |
a9fea2a3 | 5201 | |
d9adf22a | 5202 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
e5009240 PNA |
5203 | } |
5204 | ||
5205 | if (!nla[NFTA_OBJ_NAME] || | |
5206 | !nla[NFTA_OBJ_TYPE]) | |
5207 | return -EINVAL; | |
5208 | ||
cac20fcd | 5209 | table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask); |
36dd1bcc PNA |
5210 | if (IS_ERR(table)) { |
5211 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); | |
e5009240 | 5212 | return PTR_ERR(table); |
36dd1bcc | 5213 | } |
e5009240 PNA |
5214 | |
5215 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
cac20fcd | 5216 | obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); |
36dd1bcc PNA |
5217 | if (IS_ERR(obj)) { |
5218 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); | |
e5009240 | 5219 | return PTR_ERR(obj); |
36dd1bcc | 5220 | } |
e5009240 | 5221 | |
d9adf22a | 5222 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
e5009240 PNA |
5223 | if (!skb2) |
5224 | return -ENOMEM; | |
5225 | ||
43da04a5 PNA |
5226 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) |
5227 | reset = true; | |
5228 | ||
e5009240 PNA |
5229 | err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, |
5230 | nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, | |
43da04a5 | 5231 | family, table, obj, reset); |
e5009240 PNA |
5232 | if (err < 0) |
5233 | goto err; | |
5234 | ||
5235 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5236 | err: | |
5237 | kfree_skb(skb2); | |
5238 | return err; | |
e5009240 PNA |
5239 | } |
5240 | ||
00bfb320 | 5241 | static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj) |
e5009240 | 5242 | { |
dfc46034 | 5243 | if (obj->ops->destroy) |
00bfb320 | 5244 | obj->ops->destroy(ctx, obj); |
e5009240 | 5245 | |
dfc46034 | 5246 | module_put(obj->ops->type->owner); |
61509575 | 5247 | kfree(obj->name); |
e5009240 PNA |
5248 | kfree(obj); |
5249 | } | |
5250 | ||
5251 | static int nf_tables_delobj(struct net *net, struct sock *nlsk, | |
04ba724b PNA |
5252 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
5253 | const struct nlattr * const nla[], | |
5254 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
5255 | { |
5256 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5257 | u8 genmask = nft_genmask_next(net); | |
5258 | int family = nfmsg->nfgen_family; | |
36dd1bcc | 5259 | const struct nlattr *attr; |
e5009240 PNA |
5260 | struct nft_table *table; |
5261 | struct nft_object *obj; | |
5262 | struct nft_ctx ctx; | |
5263 | u32 objtype; | |
5264 | ||
5265 | if (!nla[NFTA_OBJ_TYPE] || | |
3ecbfd65 | 5266 | (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE])) |
e5009240 PNA |
5267 | return -EINVAL; |
5268 | ||
cac20fcd | 5269 | table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask); |
36dd1bcc PNA |
5270 | if (IS_ERR(table)) { |
5271 | NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); | |
e5009240 | 5272 | return PTR_ERR(table); |
36dd1bcc | 5273 | } |
e5009240 PNA |
5274 | |
5275 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
36dd1bcc PNA |
5276 | if (nla[NFTA_OBJ_HANDLE]) { |
5277 | attr = nla[NFTA_OBJ_HANDLE]; | |
5278 | obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask); | |
5279 | } else { | |
5280 | attr = nla[NFTA_OBJ_NAME]; | |
5281 | obj = nft_obj_lookup(table, attr, objtype, genmask); | |
5282 | } | |
5283 | ||
5284 | if (IS_ERR(obj)) { | |
5285 | NL_SET_BAD_ATTR(extack, attr); | |
e5009240 | 5286 | return PTR_ERR(obj); |
36dd1bcc PNA |
5287 | } |
5288 | if (obj->use > 0) { | |
5289 | NL_SET_BAD_ATTR(extack, attr); | |
e5009240 | 5290 | return -EBUSY; |
36dd1bcc | 5291 | } |
e5009240 | 5292 | |
98319cb9 | 5293 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e5009240 PNA |
5294 | |
5295 | return nft_delobj(&ctx, obj); | |
5296 | } | |
5297 | ||
25e94a99 PNA |
5298 | void nft_obj_notify(struct net *net, struct nft_table *table, |
5299 | struct nft_object *obj, u32 portid, u32 seq, int event, | |
5300 | int family, int report, gfp_t gfp) | |
e5009240 PNA |
5301 | { |
5302 | struct sk_buff *skb; | |
5303 | int err; | |
5304 | ||
2599e989 PNA |
5305 | if (!report && |
5306 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 5307 | return; |
e5009240 | 5308 | |
2599e989 | 5309 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp); |
e5009240 PNA |
5310 | if (skb == NULL) |
5311 | goto err; | |
5312 | ||
2599e989 PNA |
5313 | err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family, |
5314 | table, obj, false); | |
e5009240 PNA |
5315 | if (err < 0) { |
5316 | kfree_skb(skb); | |
5317 | goto err; | |
5318 | } | |
5319 | ||
25e94a99 PNA |
5320 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp); |
5321 | return; | |
e5009240 | 5322 | err: |
25e94a99 | 5323 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
e5009240 | 5324 | } |
2599e989 PNA |
5325 | EXPORT_SYMBOL_GPL(nft_obj_notify); |
5326 | ||
25e94a99 PNA |
5327 | static void nf_tables_obj_notify(const struct nft_ctx *ctx, |
5328 | struct nft_object *obj, int event) | |
2599e989 | 5329 | { |
25e94a99 | 5330 | nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, |
36596dad | 5331 | ctx->family, ctx->report, GFP_KERNEL); |
2599e989 | 5332 | } |
e5009240 | 5333 | |
3b49e2e9 PNA |
5334 | /* |
5335 | * Flow tables | |
5336 | */ | |
5337 | void nft_register_flowtable_type(struct nf_flowtable_type *type) | |
5338 | { | |
5339 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
5340 | list_add_tail_rcu(&type->list, &nf_tables_flowtables); | |
5341 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
5342 | } | |
5343 | EXPORT_SYMBOL_GPL(nft_register_flowtable_type); | |
5344 | ||
5345 | void nft_unregister_flowtable_type(struct nf_flowtable_type *type) | |
5346 | { | |
5347 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
5348 | list_del_rcu(&type->list); | |
5349 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
5350 | } | |
5351 | EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type); | |
5352 | ||
5353 | static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = { | |
5354 | [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING, | |
5355 | .len = NFT_NAME_MAXLEN - 1 }, | |
5356 | [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING, | |
5357 | .len = NFT_NAME_MAXLEN - 1 }, | |
5358 | [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED }, | |
3ecbfd65 | 5359 | [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 }, |
3b49e2e9 PNA |
5360 | }; |
5361 | ||
cac20fcd PNA |
5362 | struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, |
5363 | const struct nlattr *nla, u8 genmask) | |
3b49e2e9 PNA |
5364 | { |
5365 | struct nft_flowtable *flowtable; | |
5366 | ||
d9adf22a | 5367 | list_for_each_entry_rcu(flowtable, &table->flowtables, list) { |
3b49e2e9 PNA |
5368 | if (!nla_strcmp(nla, flowtable->name) && |
5369 | nft_active_genmask(flowtable, genmask)) | |
5370 | return flowtable; | |
5371 | } | |
5372 | return ERR_PTR(-ENOENT); | |
5373 | } | |
cac20fcd | 5374 | EXPORT_SYMBOL_GPL(nft_flowtable_lookup); |
3b49e2e9 | 5375 | |
ae0662f8 | 5376 | static struct nft_flowtable * |
cac20fcd PNA |
5377 | nft_flowtable_lookup_byhandle(const struct nft_table *table, |
5378 | const struct nlattr *nla, u8 genmask) | |
3ecbfd65 HS |
5379 | { |
5380 | struct nft_flowtable *flowtable; | |
5381 | ||
5382 | list_for_each_entry(flowtable, &table->flowtables, list) { | |
5383 | if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle && | |
5384 | nft_active_genmask(flowtable, genmask)) | |
5385 | return flowtable; | |
5386 | } | |
5387 | return ERR_PTR(-ENOENT); | |
5388 | } | |
5389 | ||
3b49e2e9 PNA |
5390 | static int nf_tables_parse_devices(const struct nft_ctx *ctx, |
5391 | const struct nlattr *attr, | |
5392 | struct net_device *dev_array[], int *len) | |
5393 | { | |
5394 | const struct nlattr *tmp; | |
5395 | struct net_device *dev; | |
5396 | char ifname[IFNAMSIZ]; | |
5397 | int rem, n = 0, err; | |
5398 | ||
5399 | nla_for_each_nested(tmp, attr, rem) { | |
5400 | if (nla_type(tmp) != NFTA_DEVICE_NAME) { | |
5401 | err = -EINVAL; | |
5402 | goto err1; | |
5403 | } | |
5404 | ||
5405 | nla_strlcpy(ifname, tmp, IFNAMSIZ); | |
90d2723c | 5406 | dev = __dev_get_by_name(ctx->net, ifname); |
3b49e2e9 PNA |
5407 | if (!dev) { |
5408 | err = -ENOENT; | |
5409 | goto err1; | |
5410 | } | |
5411 | ||
5412 | dev_array[n++] = dev; | |
5413 | if (n == NFT_FLOWTABLE_DEVICE_MAX) { | |
5414 | err = -EFBIG; | |
5415 | goto err1; | |
5416 | } | |
5417 | } | |
5418 | if (!len) | |
5419 | return -EINVAL; | |
5420 | ||
5421 | err = 0; | |
5422 | err1: | |
5423 | *len = n; | |
5424 | return err; | |
5425 | } | |
5426 | ||
5427 | static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = { | |
5428 | [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 }, | |
5429 | [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
5430 | [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED }, | |
5431 | }; | |
5432 | ||
5433 | static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx, | |
5434 | const struct nlattr *attr, | |
5435 | struct nft_flowtable *flowtable) | |
5436 | { | |
5437 | struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX]; | |
5438 | struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1]; | |
5439 | struct nf_hook_ops *ops; | |
5440 | int hooknum, priority; | |
5441 | int err, n = 0, i; | |
5442 | ||
5443 | err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr, | |
5444 | nft_flowtable_hook_policy, NULL); | |
5445 | if (err < 0) | |
5446 | return err; | |
5447 | ||
5448 | if (!tb[NFTA_FLOWTABLE_HOOK_NUM] || | |
5449 | !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] || | |
5450 | !tb[NFTA_FLOWTABLE_HOOK_DEVS]) | |
5451 | return -EINVAL; | |
5452 | ||
5453 | hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); | |
fe19c04c | 5454 | if (hooknum != NF_NETDEV_INGRESS) |
3b49e2e9 PNA |
5455 | return -EINVAL; |
5456 | ||
5457 | priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); | |
5458 | ||
5459 | err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS], | |
5460 | dev_array, &n); | |
5461 | if (err < 0) | |
d92191aa | 5462 | return err; |
3b49e2e9 | 5463 | |
6396bb22 | 5464 | ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL); |
90d2723c PNA |
5465 | if (!ops) |
5466 | return -ENOMEM; | |
3b49e2e9 | 5467 | |
0e839dfa PNA |
5468 | flowtable->hooknum = hooknum; |
5469 | flowtable->priority = priority; | |
3b49e2e9 PNA |
5470 | flowtable->ops = ops; |
5471 | flowtable->ops_len = n; | |
5472 | ||
5473 | for (i = 0; i < n; i++) { | |
5474 | flowtable->ops[i].pf = NFPROTO_NETDEV; | |
5475 | flowtable->ops[i].hooknum = hooknum; | |
5476 | flowtable->ops[i].priority = priority; | |
17857d92 | 5477 | flowtable->ops[i].priv = &flowtable->data; |
3b49e2e9 PNA |
5478 | flowtable->ops[i].hook = flowtable->data.type->hook; |
5479 | flowtable->ops[i].dev = dev_array[i]; | |
5480 | } | |
5481 | ||
3b49e2e9 PNA |
5482 | return err; |
5483 | } | |
5484 | ||
98319cb9 | 5485 | static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family) |
3b49e2e9 PNA |
5486 | { |
5487 | const struct nf_flowtable_type *type; | |
5488 | ||
5489 | list_for_each_entry(type, &nf_tables_flowtables, list) { | |
98319cb9 | 5490 | if (family == type->family) |
3b49e2e9 PNA |
5491 | return type; |
5492 | } | |
5493 | return NULL; | |
5494 | } | |
5495 | ||
452238e8 FW |
5496 | static const struct nf_flowtable_type * |
5497 | nft_flowtable_type_get(struct net *net, u8 family) | |
3b49e2e9 PNA |
5498 | { |
5499 | const struct nf_flowtable_type *type; | |
5500 | ||
98319cb9 | 5501 | type = __nft_flowtable_type_get(family); |
3b49e2e9 PNA |
5502 | if (type != NULL && try_module_get(type->owner)) |
5503 | return type; | |
5504 | ||
f102d66b | 5505 | lockdep_nfnl_nft_mutex_not_held(); |
3b49e2e9 PNA |
5506 | #ifdef CONFIG_MODULES |
5507 | if (type == NULL) { | |
452238e8 | 5508 | nft_request_module(net, "nf-flowtable-%u", family); |
98319cb9 | 5509 | if (__nft_flowtable_type_get(family)) |
3b49e2e9 PNA |
5510 | return ERR_PTR(-EAGAIN); |
5511 | } | |
5512 | #endif | |
5513 | return ERR_PTR(-ENOENT); | |
5514 | } | |
5515 | ||
3b49e2e9 PNA |
5516 | static void nft_unregister_flowtable_net_hooks(struct net *net, |
5517 | struct nft_flowtable *flowtable) | |
5518 | { | |
5519 | int i; | |
5520 | ||
5521 | for (i = 0; i < flowtable->ops_len; i++) { | |
5522 | if (!flowtable->ops[i].dev) | |
5523 | continue; | |
5524 | ||
5525 | nf_unregister_net_hook(net, &flowtable->ops[i]); | |
5526 | } | |
5527 | } | |
5528 | ||
5529 | static int nf_tables_newflowtable(struct net *net, struct sock *nlsk, | |
5530 | struct sk_buff *skb, | |
5531 | const struct nlmsghdr *nlh, | |
5532 | const struct nlattr * const nla[], | |
5533 | struct netlink_ext_ack *extack) | |
5534 | { | |
5535 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5536 | const struct nf_flowtable_type *type; | |
32fc7187 | 5537 | struct nft_flowtable *flowtable, *ft; |
3b49e2e9 PNA |
5538 | u8 genmask = nft_genmask_next(net); |
5539 | int family = nfmsg->nfgen_family; | |
3b49e2e9 PNA |
5540 | struct nft_table *table; |
5541 | struct nft_ctx ctx; | |
5542 | int err, i, k; | |
5543 | ||
5544 | if (!nla[NFTA_FLOWTABLE_TABLE] || | |
5545 | !nla[NFTA_FLOWTABLE_NAME] || | |
5546 | !nla[NFTA_FLOWTABLE_HOOK]) | |
5547 | return -EINVAL; | |
5548 | ||
cac20fcd PNA |
5549 | table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, |
5550 | genmask); | |
36dd1bcc PNA |
5551 | if (IS_ERR(table)) { |
5552 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); | |
3b49e2e9 | 5553 | return PTR_ERR(table); |
36dd1bcc | 5554 | } |
3b49e2e9 | 5555 | |
cac20fcd PNA |
5556 | flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], |
5557 | genmask); | |
3b49e2e9 PNA |
5558 | if (IS_ERR(flowtable)) { |
5559 | err = PTR_ERR(flowtable); | |
36dd1bcc PNA |
5560 | if (err != -ENOENT) { |
5561 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); | |
3b49e2e9 | 5562 | return err; |
36dd1bcc | 5563 | } |
3b49e2e9 | 5564 | } else { |
36dd1bcc PNA |
5565 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
5566 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); | |
3b49e2e9 | 5567 | return -EEXIST; |
36dd1bcc | 5568 | } |
3b49e2e9 PNA |
5569 | |
5570 | return 0; | |
5571 | } | |
5572 | ||
98319cb9 | 5573 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
3b49e2e9 PNA |
5574 | |
5575 | flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL); | |
5576 | if (!flowtable) | |
5577 | return -ENOMEM; | |
5578 | ||
5579 | flowtable->table = table; | |
3ecbfd65 HS |
5580 | flowtable->handle = nf_tables_alloc_handle(table); |
5581 | ||
3b49e2e9 PNA |
5582 | flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL); |
5583 | if (!flowtable->name) { | |
5584 | err = -ENOMEM; | |
5585 | goto err1; | |
5586 | } | |
5587 | ||
452238e8 | 5588 | type = nft_flowtable_type_get(net, family); |
3b49e2e9 PNA |
5589 | if (IS_ERR(type)) { |
5590 | err = PTR_ERR(type); | |
5591 | goto err2; | |
5592 | } | |
5593 | ||
5594 | flowtable->data.type = type; | |
a268de77 | 5595 | err = type->init(&flowtable->data); |
3b49e2e9 PNA |
5596 | if (err < 0) |
5597 | goto err3; | |
5598 | ||
5599 | err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK], | |
5600 | flowtable); | |
5601 | if (err < 0) | |
a268de77 | 5602 | goto err4; |
3b49e2e9 PNA |
5603 | |
5604 | for (i = 0; i < flowtable->ops_len; i++) { | |
32fc7187 PNA |
5605 | if (!flowtable->ops[i].dev) |
5606 | continue; | |
5607 | ||
5608 | list_for_each_entry(ft, &table->flowtables, list) { | |
5609 | for (k = 0; k < ft->ops_len; k++) { | |
5610 | if (!ft->ops[k].dev) | |
5611 | continue; | |
5612 | ||
5613 | if (flowtable->ops[i].dev == ft->ops[k].dev && | |
5614 | flowtable->ops[i].pf == ft->ops[k].pf) { | |
5615 | err = -EBUSY; | |
a268de77 | 5616 | goto err5; |
32fc7187 PNA |
5617 | } |
5618 | } | |
5619 | } | |
5620 | ||
3b49e2e9 PNA |
5621 | err = nf_register_net_hook(net, &flowtable->ops[i]); |
5622 | if (err < 0) | |
a268de77 | 5623 | goto err5; |
3b49e2e9 PNA |
5624 | } |
5625 | ||
5626 | err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable); | |
5627 | if (err < 0) | |
a268de77 | 5628 | goto err6; |
3b49e2e9 PNA |
5629 | |
5630 | list_add_tail_rcu(&flowtable->list, &table->flowtables); | |
5631 | table->use++; | |
5632 | ||
5633 | return 0; | |
a268de77 | 5634 | err6: |
3b49e2e9 | 5635 | i = flowtable->ops_len; |
a268de77 | 5636 | err5: |
b8088dda | 5637 | for (k = i - 1; k >= 0; k--) |
0e0d5002 | 5638 | nf_unregister_net_hook(net, &flowtable->ops[k]); |
3b49e2e9 PNA |
5639 | |
5640 | kfree(flowtable->ops); | |
a268de77 FF |
5641 | err4: |
5642 | flowtable->data.type->free(&flowtable->data); | |
3b49e2e9 PNA |
5643 | err3: |
5644 | module_put(type->owner); | |
5645 | err2: | |
5646 | kfree(flowtable->name); | |
5647 | err1: | |
5648 | kfree(flowtable); | |
5649 | return err; | |
5650 | } | |
5651 | ||
5652 | static int nf_tables_delflowtable(struct net *net, struct sock *nlsk, | |
5653 | struct sk_buff *skb, | |
5654 | const struct nlmsghdr *nlh, | |
5655 | const struct nlattr * const nla[], | |
5656 | struct netlink_ext_ack *extack) | |
5657 | { | |
5658 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5659 | u8 genmask = nft_genmask_next(net); | |
5660 | int family = nfmsg->nfgen_family; | |
5661 | struct nft_flowtable *flowtable; | |
36dd1bcc | 5662 | const struct nlattr *attr; |
3b49e2e9 PNA |
5663 | struct nft_table *table; |
5664 | struct nft_ctx ctx; | |
5665 | ||
e603ea4b PNA |
5666 | if (!nla[NFTA_FLOWTABLE_TABLE] || |
5667 | (!nla[NFTA_FLOWTABLE_NAME] && | |
5668 | !nla[NFTA_FLOWTABLE_HANDLE])) | |
5669 | return -EINVAL; | |
5670 | ||
cac20fcd PNA |
5671 | table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, |
5672 | genmask); | |
36dd1bcc PNA |
5673 | if (IS_ERR(table)) { |
5674 | NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); | |
3b49e2e9 | 5675 | return PTR_ERR(table); |
36dd1bcc | 5676 | } |
3b49e2e9 | 5677 | |
36dd1bcc PNA |
5678 | if (nla[NFTA_FLOWTABLE_HANDLE]) { |
5679 | attr = nla[NFTA_FLOWTABLE_HANDLE]; | |
5680 | flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask); | |
5681 | } else { | |
5682 | attr = nla[NFTA_FLOWTABLE_NAME]; | |
5683 | flowtable = nft_flowtable_lookup(table, attr, genmask); | |
5684 | } | |
5685 | ||
5686 | if (IS_ERR(flowtable)) { | |
5687 | NL_SET_BAD_ATTR(extack, attr); | |
5688 | return PTR_ERR(flowtable); | |
5689 | } | |
5690 | if (flowtable->use > 0) { | |
5691 | NL_SET_BAD_ATTR(extack, attr); | |
3b49e2e9 | 5692 | return -EBUSY; |
36dd1bcc | 5693 | } |
3b49e2e9 | 5694 | |
98319cb9 | 5695 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
3b49e2e9 PNA |
5696 | |
5697 | return nft_delflowtable(&ctx, flowtable); | |
5698 | } | |
5699 | ||
5700 | static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net, | |
5701 | u32 portid, u32 seq, int event, | |
5702 | u32 flags, int family, | |
5703 | struct nft_flowtable *flowtable) | |
5704 | { | |
5705 | struct nlattr *nest, *nest_devs; | |
5706 | struct nfgenmsg *nfmsg; | |
5707 | struct nlmsghdr *nlh; | |
5708 | int i; | |
5709 | ||
5710 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); | |
5711 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
5712 | if (nlh == NULL) | |
5713 | goto nla_put_failure; | |
5714 | ||
5715 | nfmsg = nlmsg_data(nlh); | |
5716 | nfmsg->nfgen_family = family; | |
5717 | nfmsg->version = NFNETLINK_V0; | |
5718 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
5719 | ||
5720 | if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) || | |
5721 | nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) || | |
3ecbfd65 HS |
5722 | nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) || |
5723 | nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle), | |
5724 | NFTA_FLOWTABLE_PAD)) | |
3b49e2e9 PNA |
5725 | goto nla_put_failure; |
5726 | ||
5727 | nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK); | |
eb895086 KL |
5728 | if (!nest) |
5729 | goto nla_put_failure; | |
3b49e2e9 PNA |
5730 | if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) || |
5731 | nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority))) | |
5732 | goto nla_put_failure; | |
5733 | ||
5734 | nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS); | |
5735 | if (!nest_devs) | |
5736 | goto nla_put_failure; | |
5737 | ||
5738 | for (i = 0; i < flowtable->ops_len; i++) { | |
b8088dda FW |
5739 | const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev); |
5740 | ||
5741 | if (dev && | |
5742 | nla_put_string(skb, NFTA_DEVICE_NAME, dev->name)) | |
3b49e2e9 PNA |
5743 | goto nla_put_failure; |
5744 | } | |
5745 | nla_nest_end(skb, nest_devs); | |
5746 | nla_nest_end(skb, nest); | |
5747 | ||
5748 | nlmsg_end(skb, nlh); | |
5749 | return 0; | |
5750 | ||
5751 | nla_put_failure: | |
5752 | nlmsg_trim(skb, nlh); | |
5753 | return -1; | |
5754 | } | |
5755 | ||
5756 | struct nft_flowtable_filter { | |
5757 | char *table; | |
5758 | }; | |
5759 | ||
5760 | static int nf_tables_dump_flowtable(struct sk_buff *skb, | |
5761 | struct netlink_callback *cb) | |
5762 | { | |
5763 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
5764 | struct nft_flowtable_filter *filter = cb->data; | |
5765 | unsigned int idx = 0, s_idx = cb->args[0]; | |
5766 | struct net *net = sock_net(skb->sk); | |
5767 | int family = nfmsg->nfgen_family; | |
5768 | struct nft_flowtable *flowtable; | |
3b49e2e9 PNA |
5769 | const struct nft_table *table; |
5770 | ||
5771 | rcu_read_lock(); | |
5772 | cb->seq = net->nft.base_seq; | |
5773 | ||
36596dad | 5774 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 5775 | if (family != NFPROTO_UNSPEC && family != table->family) |
3b49e2e9 PNA |
5776 | continue; |
5777 | ||
36596dad PNA |
5778 | list_for_each_entry_rcu(flowtable, &table->flowtables, list) { |
5779 | if (!nft_is_active(net, flowtable)) | |
5780 | goto cont; | |
5781 | if (idx < s_idx) | |
5782 | goto cont; | |
5783 | if (idx > s_idx) | |
5784 | memset(&cb->args[1], 0, | |
5785 | sizeof(cb->args) - sizeof(cb->args[0])); | |
360cc79d | 5786 | if (filter && filter->table && |
36596dad PNA |
5787 | strcmp(filter->table, table->name)) |
5788 | goto cont; | |
3b49e2e9 | 5789 | |
36596dad PNA |
5790 | if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid, |
5791 | cb->nlh->nlmsg_seq, | |
5792 | NFT_MSG_NEWFLOWTABLE, | |
5793 | NLM_F_MULTI | NLM_F_APPEND, | |
98319cb9 | 5794 | table->family, flowtable) < 0) |
36596dad | 5795 | goto done; |
3b49e2e9 | 5796 | |
36596dad | 5797 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
3b49e2e9 | 5798 | cont: |
36596dad | 5799 | idx++; |
3b49e2e9 PNA |
5800 | } |
5801 | } | |
5802 | done: | |
5803 | rcu_read_unlock(); | |
5804 | ||
5805 | cb->args[0] = idx; | |
5806 | return skb->len; | |
5807 | } | |
5808 | ||
90fd131a | 5809 | static int nf_tables_dump_flowtable_start(struct netlink_callback *cb) |
3b49e2e9 | 5810 | { |
90fd131a FW |
5811 | const struct nlattr * const *nla = cb->data; |
5812 | struct nft_flowtable_filter *filter = NULL; | |
3b49e2e9 | 5813 | |
90fd131a FW |
5814 | if (nla[NFTA_FLOWTABLE_TABLE]) { |
5815 | filter = kzalloc(sizeof(*filter), GFP_ATOMIC); | |
5816 | if (!filter) | |
5817 | return -ENOMEM; | |
3b49e2e9 | 5818 | |
90fd131a FW |
5819 | filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE], |
5820 | GFP_ATOMIC); | |
5821 | if (!filter->table) { | |
5822 | kfree(filter); | |
5823 | return -ENOMEM; | |
5824 | } | |
5825 | } | |
3b49e2e9 | 5826 | |
90fd131a | 5827 | cb->data = filter; |
3b49e2e9 PNA |
5828 | return 0; |
5829 | } | |
5830 | ||
90fd131a | 5831 | static int nf_tables_dump_flowtable_done(struct netlink_callback *cb) |
3b49e2e9 | 5832 | { |
90fd131a | 5833 | struct nft_flowtable_filter *filter = cb->data; |
3b49e2e9 | 5834 | |
3b49e2e9 | 5835 | if (!filter) |
90fd131a | 5836 | return 0; |
3b49e2e9 | 5837 | |
90fd131a FW |
5838 | kfree(filter->table); |
5839 | kfree(filter); | |
5840 | ||
5841 | return 0; | |
3b49e2e9 PNA |
5842 | } |
5843 | ||
d9adf22a | 5844 | /* called with rcu_read_lock held */ |
3b49e2e9 PNA |
5845 | static int nf_tables_getflowtable(struct net *net, struct sock *nlsk, |
5846 | struct sk_buff *skb, | |
5847 | const struct nlmsghdr *nlh, | |
5848 | const struct nlattr * const nla[], | |
5849 | struct netlink_ext_ack *extack) | |
5850 | { | |
5851 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5852 | u8 genmask = nft_genmask_cur(net); | |
5853 | int family = nfmsg->nfgen_family; | |
5854 | struct nft_flowtable *flowtable; | |
3b49e2e9 PNA |
5855 | const struct nft_table *table; |
5856 | struct sk_buff *skb2; | |
5857 | int err; | |
5858 | ||
5859 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
5860 | struct netlink_dump_control c = { | |
90fd131a | 5861 | .start = nf_tables_dump_flowtable_start, |
3b49e2e9 PNA |
5862 | .dump = nf_tables_dump_flowtable, |
5863 | .done = nf_tables_dump_flowtable_done, | |
d9adf22a | 5864 | .module = THIS_MODULE, |
90fd131a | 5865 | .data = (void *)nla, |
3b49e2e9 PNA |
5866 | }; |
5867 | ||
d9adf22a | 5868 | return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c); |
3b49e2e9 PNA |
5869 | } |
5870 | ||
5871 | if (!nla[NFTA_FLOWTABLE_NAME]) | |
5872 | return -EINVAL; | |
5873 | ||
cac20fcd PNA |
5874 | table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, |
5875 | genmask); | |
3b49e2e9 PNA |
5876 | if (IS_ERR(table)) |
5877 | return PTR_ERR(table); | |
5878 | ||
cac20fcd PNA |
5879 | flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], |
5880 | genmask); | |
03a0120f | 5881 | if (IS_ERR(flowtable)) |
3b49e2e9 PNA |
5882 | return PTR_ERR(flowtable); |
5883 | ||
d9adf22a | 5884 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
3b49e2e9 PNA |
5885 | if (!skb2) |
5886 | return -ENOMEM; | |
5887 | ||
5888 | err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid, | |
5889 | nlh->nlmsg_seq, | |
5890 | NFT_MSG_NEWFLOWTABLE, 0, family, | |
5891 | flowtable); | |
5892 | if (err < 0) | |
5893 | goto err; | |
5894 | ||
5895 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5896 | err: | |
5897 | kfree_skb(skb2); | |
5898 | return err; | |
5899 | } | |
5900 | ||
5901 | static void nf_tables_flowtable_notify(struct nft_ctx *ctx, | |
5902 | struct nft_flowtable *flowtable, | |
5903 | int event) | |
5904 | { | |
5905 | struct sk_buff *skb; | |
5906 | int err; | |
5907 | ||
5908 | if (ctx->report && | |
5909 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
5910 | return; | |
5911 | ||
5912 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
5913 | if (skb == NULL) | |
5914 | goto err; | |
5915 | ||
5916 | err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid, | |
5917 | ctx->seq, event, 0, | |
36596dad | 5918 | ctx->family, flowtable); |
3b49e2e9 PNA |
5919 | if (err < 0) { |
5920 | kfree_skb(skb); | |
5921 | goto err; | |
5922 | } | |
5923 | ||
5924 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
5925 | ctx->report, GFP_KERNEL); | |
5926 | return; | |
5927 | err: | |
5928 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); | |
5929 | } | |
5930 | ||
3b49e2e9 PNA |
5931 | static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable) |
5932 | { | |
c04a3f73 | 5933 | kfree(flowtable->ops); |
3b49e2e9 | 5934 | kfree(flowtable->name); |
b408c5b0 | 5935 | flowtable->data.type->free(&flowtable->data); |
3b49e2e9 | 5936 | module_put(flowtable->data.type->owner); |
a12486eb | 5937 | kfree(flowtable); |
3b49e2e9 PNA |
5938 | } |
5939 | ||
84d7fce6 PNA |
5940 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
5941 | u32 portid, u32 seq) | |
5942 | { | |
5943 | struct nlmsghdr *nlh; | |
5944 | struct nfgenmsg *nfmsg; | |
784b4e61 | 5945 | char buf[TASK_COMM_LEN]; |
dedb67c4 | 5946 | int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); |
84d7fce6 PNA |
5947 | |
5948 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
5949 | if (nlh == NULL) | |
5950 | goto nla_put_failure; | |
5951 | ||
5952 | nfmsg = nlmsg_data(nlh); | |
5953 | nfmsg->nfgen_family = AF_UNSPEC; | |
5954 | nfmsg->version = NFNETLINK_V0; | |
5955 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
5956 | ||
784b4e61 PS |
5957 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) || |
5958 | nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) || | |
5959 | nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current))) | |
84d7fce6 PNA |
5960 | goto nla_put_failure; |
5961 | ||
053c095a JB |
5962 | nlmsg_end(skb, nlh); |
5963 | return 0; | |
84d7fce6 PNA |
5964 | |
5965 | nla_put_failure: | |
5966 | nlmsg_trim(skb, nlh); | |
5967 | return -EMSGSIZE; | |
5968 | } | |
5969 | ||
3b49e2e9 PNA |
5970 | static void nft_flowtable_event(unsigned long event, struct net_device *dev, |
5971 | struct nft_flowtable *flowtable) | |
5972 | { | |
5973 | int i; | |
5974 | ||
5975 | for (i = 0; i < flowtable->ops_len; i++) { | |
5976 | if (flowtable->ops[i].dev != dev) | |
5977 | continue; | |
5978 | ||
5979 | nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]); | |
5980 | flowtable->ops[i].dev = NULL; | |
5981 | break; | |
5982 | } | |
5983 | } | |
5984 | ||
5985 | static int nf_tables_flowtable_event(struct notifier_block *this, | |
5986 | unsigned long event, void *ptr) | |
5987 | { | |
5988 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
5989 | struct nft_flowtable *flowtable; | |
5990 | struct nft_table *table; | |
0a2cf5ee | 5991 | struct net *net; |
3b49e2e9 PNA |
5992 | |
5993 | if (event != NETDEV_UNREGISTER) | |
5994 | return 0; | |
5995 | ||
6a48de01 | 5996 | net = dev_net(dev); |
9e619d87 | 5997 | mutex_lock(&net->nft.commit_mutex); |
0a2cf5ee | 5998 | list_for_each_entry(table, &net->nft.tables, list) { |
36596dad PNA |
5999 | list_for_each_entry(flowtable, &table->flowtables, list) { |
6000 | nft_flowtable_event(event, dev, flowtable); | |
3b49e2e9 PNA |
6001 | } |
6002 | } | |
9e619d87 | 6003 | mutex_unlock(&net->nft.commit_mutex); |
6a48de01 | 6004 | |
3b49e2e9 PNA |
6005 | return NOTIFY_DONE; |
6006 | } | |
6007 | ||
6008 | static struct notifier_block nf_tables_flowtable_notifier = { | |
6009 | .notifier_call = nf_tables_flowtable_event, | |
6010 | }; | |
6011 | ||
25e94a99 PNA |
6012 | static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, |
6013 | int event) | |
84d7fce6 PNA |
6014 | { |
6015 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
6016 | struct sk_buff *skb2; | |
6017 | int err; | |
6018 | ||
6019 | if (nlmsg_report(nlh) && | |
6020 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 6021 | return; |
84d7fce6 | 6022 | |
84d7fce6 PNA |
6023 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
6024 | if (skb2 == NULL) | |
6025 | goto err; | |
6026 | ||
6027 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
6028 | nlh->nlmsg_seq); | |
6029 | if (err < 0) { | |
6030 | kfree_skb(skb2); | |
6031 | goto err; | |
6032 | } | |
6033 | ||
25e94a99 PNA |
6034 | nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
6035 | nlmsg_report(nlh), GFP_KERNEL); | |
6036 | return; | |
84d7fce6 | 6037 | err: |
25e94a99 PNA |
6038 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
6039 | -ENOBUFS); | |
84d7fce6 PNA |
6040 | } |
6041 | ||
7b8002a1 PNA |
6042 | static int nf_tables_getgen(struct net *net, struct sock *nlsk, |
6043 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
6044 | const struct nlattr * const nla[], |
6045 | struct netlink_ext_ack *extack) | |
84d7fce6 | 6046 | { |
84d7fce6 PNA |
6047 | struct sk_buff *skb2; |
6048 | int err; | |
6049 | ||
d9adf22a | 6050 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
84d7fce6 PNA |
6051 | if (skb2 == NULL) |
6052 | return -ENOMEM; | |
6053 | ||
6054 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
6055 | nlh->nlmsg_seq); | |
6056 | if (err < 0) | |
6057 | goto err; | |
6058 | ||
6059 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
6060 | err: | |
6061 | kfree_skb(skb2); | |
6062 | return err; | |
6063 | } | |
6064 | ||
96518518 PM |
6065 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
6066 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 6067 | .call_batch = nf_tables_newtable, |
96518518 PM |
6068 | .attr_count = NFTA_TABLE_MAX, |
6069 | .policy = nft_table_policy, | |
6070 | }, | |
6071 | [NFT_MSG_GETTABLE] = { | |
d9adf22a | 6072 | .call_rcu = nf_tables_gettable, |
96518518 PM |
6073 | .attr_count = NFTA_TABLE_MAX, |
6074 | .policy = nft_table_policy, | |
6075 | }, | |
6076 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 6077 | .call_batch = nf_tables_deltable, |
96518518 PM |
6078 | .attr_count = NFTA_TABLE_MAX, |
6079 | .policy = nft_table_policy, | |
6080 | }, | |
6081 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 6082 | .call_batch = nf_tables_newchain, |
96518518 PM |
6083 | .attr_count = NFTA_CHAIN_MAX, |
6084 | .policy = nft_chain_policy, | |
6085 | }, | |
6086 | [NFT_MSG_GETCHAIN] = { | |
d9adf22a | 6087 | .call_rcu = nf_tables_getchain, |
96518518 PM |
6088 | .attr_count = NFTA_CHAIN_MAX, |
6089 | .policy = nft_chain_policy, | |
6090 | }, | |
6091 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 6092 | .call_batch = nf_tables_delchain, |
96518518 PM |
6093 | .attr_count = NFTA_CHAIN_MAX, |
6094 | .policy = nft_chain_policy, | |
6095 | }, | |
6096 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 6097 | .call_batch = nf_tables_newrule, |
96518518 PM |
6098 | .attr_count = NFTA_RULE_MAX, |
6099 | .policy = nft_rule_policy, | |
6100 | }, | |
6101 | [NFT_MSG_GETRULE] = { | |
d9adf22a | 6102 | .call_rcu = nf_tables_getrule, |
96518518 PM |
6103 | .attr_count = NFTA_RULE_MAX, |
6104 | .policy = nft_rule_policy, | |
6105 | }, | |
6106 | [NFT_MSG_DELRULE] = { | |
0628b123 | 6107 | .call_batch = nf_tables_delrule, |
96518518 PM |
6108 | .attr_count = NFTA_RULE_MAX, |
6109 | .policy = nft_rule_policy, | |
6110 | }, | |
20a69341 | 6111 | [NFT_MSG_NEWSET] = { |
958bee14 | 6112 | .call_batch = nf_tables_newset, |
20a69341 PM |
6113 | .attr_count = NFTA_SET_MAX, |
6114 | .policy = nft_set_policy, | |
6115 | }, | |
6116 | [NFT_MSG_GETSET] = { | |
d9adf22a | 6117 | .call_rcu = nf_tables_getset, |
20a69341 PM |
6118 | .attr_count = NFTA_SET_MAX, |
6119 | .policy = nft_set_policy, | |
6120 | }, | |
6121 | [NFT_MSG_DELSET] = { | |
958bee14 | 6122 | .call_batch = nf_tables_delset, |
20a69341 PM |
6123 | .attr_count = NFTA_SET_MAX, |
6124 | .policy = nft_set_policy, | |
6125 | }, | |
6126 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 6127 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
6128 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
6129 | .policy = nft_set_elem_list_policy, | |
6130 | }, | |
6131 | [NFT_MSG_GETSETELEM] = { | |
d9adf22a | 6132 | .call_rcu = nf_tables_getsetelem, |
20a69341 PM |
6133 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
6134 | .policy = nft_set_elem_list_policy, | |
6135 | }, | |
6136 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 6137 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
6138 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
6139 | .policy = nft_set_elem_list_policy, | |
6140 | }, | |
84d7fce6 | 6141 | [NFT_MSG_GETGEN] = { |
d9adf22a | 6142 | .call_rcu = nf_tables_getgen, |
84d7fce6 | 6143 | }, |
e5009240 PNA |
6144 | [NFT_MSG_NEWOBJ] = { |
6145 | .call_batch = nf_tables_newobj, | |
6146 | .attr_count = NFTA_OBJ_MAX, | |
6147 | .policy = nft_obj_policy, | |
6148 | }, | |
6149 | [NFT_MSG_GETOBJ] = { | |
d9adf22a | 6150 | .call_rcu = nf_tables_getobj, |
e5009240 PNA |
6151 | .attr_count = NFTA_OBJ_MAX, |
6152 | .policy = nft_obj_policy, | |
6153 | }, | |
6154 | [NFT_MSG_DELOBJ] = { | |
6155 | .call_batch = nf_tables_delobj, | |
6156 | .attr_count = NFTA_OBJ_MAX, | |
6157 | .policy = nft_obj_policy, | |
6158 | }, | |
43da04a5 | 6159 | [NFT_MSG_GETOBJ_RESET] = { |
d9adf22a | 6160 | .call_rcu = nf_tables_getobj, |
43da04a5 PNA |
6161 | .attr_count = NFTA_OBJ_MAX, |
6162 | .policy = nft_obj_policy, | |
6163 | }, | |
3b49e2e9 PNA |
6164 | [NFT_MSG_NEWFLOWTABLE] = { |
6165 | .call_batch = nf_tables_newflowtable, | |
6166 | .attr_count = NFTA_FLOWTABLE_MAX, | |
6167 | .policy = nft_flowtable_policy, | |
6168 | }, | |
6169 | [NFT_MSG_GETFLOWTABLE] = { | |
d9adf22a | 6170 | .call_rcu = nf_tables_getflowtable, |
3b49e2e9 PNA |
6171 | .attr_count = NFTA_FLOWTABLE_MAX, |
6172 | .policy = nft_flowtable_policy, | |
6173 | }, | |
6174 | [NFT_MSG_DELFLOWTABLE] = { | |
6175 | .call_batch = nf_tables_delflowtable, | |
6176 | .attr_count = NFTA_FLOWTABLE_MAX, | |
6177 | .policy = nft_flowtable_policy, | |
6178 | }, | |
96518518 PM |
6179 | }; |
6180 | ||
a654de8f PNA |
6181 | static int nf_tables_validate(struct net *net) |
6182 | { | |
6183 | struct nft_table *table; | |
6184 | ||
6185 | switch (net->nft.validate_state) { | |
6186 | case NFT_VALIDATE_SKIP: | |
6187 | break; | |
6188 | case NFT_VALIDATE_NEED: | |
6189 | nft_validate_state_update(net, NFT_VALIDATE_DO); | |
6190 | /* fall through */ | |
6191 | case NFT_VALIDATE_DO: | |
6192 | list_for_each_entry(table, &net->nft.tables, list) { | |
6193 | if (nft_table_validate(net, table) < 0) | |
6194 | return -EAGAIN; | |
6195 | } | |
6196 | break; | |
6197 | } | |
6198 | ||
6199 | return 0; | |
6200 | } | |
6201 | ||
91c7b38d PNA |
6202 | static void nft_chain_commit_update(struct nft_trans *trans) |
6203 | { | |
6204 | struct nft_base_chain *basechain; | |
6205 | ||
1b2470e5 FW |
6206 | if (nft_trans_chain_name(trans)) { |
6207 | rhltable_remove(&trans->ctx.table->chains_ht, | |
6208 | &trans->ctx.chain->rhlhead, | |
6209 | nft_chain_ht_params); | |
d71efb59 | 6210 | swap(trans->ctx.chain->name, nft_trans_chain_name(trans)); |
1b2470e5 FW |
6211 | rhltable_insert_key(&trans->ctx.table->chains_ht, |
6212 | trans->ctx.chain->name, | |
6213 | &trans->ctx.chain->rhlhead, | |
6214 | nft_chain_ht_params); | |
6215 | } | |
91c7b38d | 6216 | |
f323d954 | 6217 | if (!nft_is_base_chain(trans->ctx.chain)) |
91c7b38d PNA |
6218 | return; |
6219 | ||
6220 | basechain = nft_base_chain(trans->ctx.chain); | |
4c05ec47 TY |
6221 | nft_chain_stats_replace(trans->ctx.net, basechain, |
6222 | nft_trans_chain_stats(trans)); | |
91c7b38d PNA |
6223 | |
6224 | switch (nft_trans_chain_policy(trans)) { | |
6225 | case NF_DROP: | |
6226 | case NF_ACCEPT: | |
6227 | basechain->policy = nft_trans_chain_policy(trans); | |
6228 | break; | |
6229 | } | |
6230 | } | |
6231 | ||
2f99aa31 | 6232 | static void nft_commit_release(struct nft_trans *trans) |
c7c32e72 | 6233 | { |
c7c32e72 PNA |
6234 | switch (trans->msg_type) { |
6235 | case NFT_MSG_DELTABLE: | |
6236 | nf_tables_table_destroy(&trans->ctx); | |
6237 | break; | |
9f8aac0b FW |
6238 | case NFT_MSG_NEWCHAIN: |
6239 | kfree(nft_trans_chain_name(trans)); | |
6240 | break; | |
c7c32e72 | 6241 | case NFT_MSG_DELCHAIN: |
43a605f2 | 6242 | nf_tables_chain_destroy(&trans->ctx); |
c7c32e72 PNA |
6243 | break; |
6244 | case NFT_MSG_DELRULE: | |
6245 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
6246 | break; | |
6247 | case NFT_MSG_DELSET: | |
6248 | nft_set_destroy(nft_trans_set(trans)); | |
6249 | break; | |
61edafbb | 6250 | case NFT_MSG_DELSETELEM: |
3453c927 PNA |
6251 | nf_tables_set_elem_destroy(&trans->ctx, |
6252 | nft_trans_elem_set(trans), | |
59105446 | 6253 | nft_trans_elem(trans).priv); |
61edafbb | 6254 | break; |
e5009240 | 6255 | case NFT_MSG_DELOBJ: |
00bfb320 | 6256 | nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); |
e5009240 | 6257 | break; |
3b49e2e9 PNA |
6258 | case NFT_MSG_DELFLOWTABLE: |
6259 | nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); | |
6260 | break; | |
c7c32e72 | 6261 | } |
0935d558 FW |
6262 | |
6263 | if (trans->put_net) | |
6264 | put_net(trans->ctx.net); | |
6265 | ||
c7c32e72 PNA |
6266 | kfree(trans); |
6267 | } | |
6268 | ||
0935d558 | 6269 | static void nf_tables_trans_destroy_work(struct work_struct *w) |
2f99aa31 FW |
6270 | { |
6271 | struct nft_trans *trans, *next; | |
0935d558 FW |
6272 | LIST_HEAD(head); |
6273 | ||
6274 | spin_lock(&nf_tables_destroy_list_lock); | |
6275 | list_splice_init(&nf_tables_destroy_list, &head); | |
6276 | spin_unlock(&nf_tables_destroy_list_lock); | |
2f99aa31 | 6277 | |
0935d558 | 6278 | if (list_empty(&head)) |
2f99aa31 FW |
6279 | return; |
6280 | ||
6281 | synchronize_rcu(); | |
6282 | ||
0935d558 | 6283 | list_for_each_entry_safe(trans, next, &head, list) { |
2f99aa31 FW |
6284 | list_del(&trans->list); |
6285 | nft_commit_release(trans); | |
6286 | } | |
6287 | } | |
6288 | ||
0cbc06b3 FW |
6289 | static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain) |
6290 | { | |
6291 | struct nft_rule *rule; | |
6292 | unsigned int alloc = 0; | |
6293 | int i; | |
6294 | ||
6295 | /* already handled or inactive chain? */ | |
6296 | if (chain->rules_next || !nft_is_active_next(net, chain)) | |
6297 | return 0; | |
6298 | ||
6299 | rule = list_entry(&chain->rules, struct nft_rule, list); | |
6300 | i = 0; | |
6301 | ||
6302 | list_for_each_entry_continue(rule, &chain->rules, list) { | |
6303 | if (nft_is_active_next(net, rule)) | |
6304 | alloc++; | |
6305 | } | |
6306 | ||
6307 | chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc); | |
6308 | if (!chain->rules_next) | |
6309 | return -ENOMEM; | |
6310 | ||
6311 | list_for_each_entry_continue(rule, &chain->rules, list) { | |
6312 | if (nft_is_active_next(net, rule)) | |
6313 | chain->rules_next[i++] = rule; | |
6314 | } | |
6315 | ||
6316 | chain->rules_next[i] = NULL; | |
6317 | return 0; | |
6318 | } | |
6319 | ||
6320 | static void nf_tables_commit_chain_prepare_cancel(struct net *net) | |
6321 | { | |
6322 | struct nft_trans *trans, *next; | |
6323 | ||
6324 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
6325 | struct nft_chain *chain = trans->ctx.chain; | |
6326 | ||
6327 | if (trans->msg_type == NFT_MSG_NEWRULE || | |
6328 | trans->msg_type == NFT_MSG_DELRULE) { | |
6329 | kvfree(chain->rules_next); | |
6330 | chain->rules_next = NULL; | |
6331 | } | |
6332 | } | |
6333 | } | |
6334 | ||
6335 | static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h) | |
6336 | { | |
6337 | struct nft_rules_old *o = container_of(h, struct nft_rules_old, h); | |
6338 | ||
6339 | kvfree(o->start); | |
6340 | } | |
6341 | ||
6342 | static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules) | |
6343 | { | |
6344 | struct nft_rule **r = rules; | |
6345 | struct nft_rules_old *old; | |
6346 | ||
6347 | while (*r) | |
6348 | r++; | |
6349 | ||
6350 | r++; /* rcu_head is after end marker */ | |
6351 | old = (void *) r; | |
6352 | old->start = rules; | |
6353 | ||
6354 | call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old); | |
6355 | } | |
6356 | ||
0fb39bbe | 6357 | static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain) |
0cbc06b3 FW |
6358 | { |
6359 | struct nft_rule **g0, **g1; | |
6360 | bool next_genbit; | |
6361 | ||
6362 | next_genbit = nft_gencursor_next(net); | |
6363 | ||
6364 | g0 = rcu_dereference_protected(chain->rules_gen_0, | |
f102d66b | 6365 | lockdep_commit_lock_is_held(net)); |
0cbc06b3 | 6366 | g1 = rcu_dereference_protected(chain->rules_gen_1, |
f102d66b | 6367 | lockdep_commit_lock_is_held(net)); |
0cbc06b3 FW |
6368 | |
6369 | /* No changes to this chain? */ | |
6370 | if (chain->rules_next == NULL) { | |
6371 | /* chain had no change in last or next generation */ | |
6372 | if (g0 == g1) | |
6373 | return; | |
6374 | /* | |
6375 | * chain had no change in this generation; make sure next | |
6376 | * one uses same rules as current generation. | |
6377 | */ | |
6378 | if (next_genbit) { | |
6379 | rcu_assign_pointer(chain->rules_gen_1, g0); | |
6380 | nf_tables_commit_chain_free_rules_old(g1); | |
6381 | } else { | |
6382 | rcu_assign_pointer(chain->rules_gen_0, g1); | |
6383 | nf_tables_commit_chain_free_rules_old(g0); | |
6384 | } | |
6385 | ||
6386 | return; | |
6387 | } | |
6388 | ||
6389 | if (next_genbit) | |
6390 | rcu_assign_pointer(chain->rules_gen_1, chain->rules_next); | |
6391 | else | |
6392 | rcu_assign_pointer(chain->rules_gen_0, chain->rules_next); | |
6393 | ||
6394 | chain->rules_next = NULL; | |
6395 | ||
6396 | if (g0 == g1) | |
6397 | return; | |
6398 | ||
6399 | if (next_genbit) | |
6400 | nf_tables_commit_chain_free_rules_old(g1); | |
6401 | else | |
6402 | nf_tables_commit_chain_free_rules_old(g0); | |
6403 | } | |
6404 | ||
1b2470e5 FW |
6405 | static void nft_chain_del(struct nft_chain *chain) |
6406 | { | |
6407 | struct nft_table *table = chain->table; | |
6408 | ||
6409 | WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead, | |
6410 | nft_chain_ht_params)); | |
6411 | list_del_rcu(&chain->list); | |
6412 | } | |
6413 | ||
0935d558 FW |
6414 | static void nf_tables_commit_release(struct net *net) |
6415 | { | |
6416 | struct nft_trans *trans; | |
6417 | ||
6418 | /* all side effects have to be made visible. | |
6419 | * For example, if a chain named 'foo' has been deleted, a | |
6420 | * new transaction must not find it anymore. | |
6421 | * | |
6422 | * Memory reclaim happens asynchronously from work queue | |
6423 | * to prevent expensive synchronize_rcu() in commit phase. | |
6424 | */ | |
6425 | if (list_empty(&net->nft.commit_list)) { | |
6426 | mutex_unlock(&net->nft.commit_mutex); | |
6427 | return; | |
6428 | } | |
6429 | ||
6430 | trans = list_last_entry(&net->nft.commit_list, | |
6431 | struct nft_trans, list); | |
6432 | get_net(trans->ctx.net); | |
6433 | WARN_ON_ONCE(trans->put_net); | |
6434 | ||
6435 | trans->put_net = true; | |
6436 | spin_lock(&nf_tables_destroy_list_lock); | |
6437 | list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list); | |
6438 | spin_unlock(&nf_tables_destroy_list_lock); | |
6439 | ||
6440 | mutex_unlock(&net->nft.commit_mutex); | |
6441 | ||
6442 | schedule_work(&trans_destroy_work); | |
6443 | } | |
6444 | ||
5913beaf | 6445 | static int nf_tables_commit(struct net *net, struct sk_buff *skb) |
37082f93 | 6446 | { |
37082f93 | 6447 | struct nft_trans *trans, *next; |
a3716e70 | 6448 | struct nft_trans_elem *te; |
0cbc06b3 FW |
6449 | struct nft_chain *chain; |
6450 | struct nft_table *table; | |
37082f93 | 6451 | |
a654de8f PNA |
6452 | /* 0. Validate ruleset, otherwise roll back for error reporting. */ |
6453 | if (nf_tables_validate(net) < 0) | |
6454 | return -EAGAIN; | |
6455 | ||
0cbc06b3 FW |
6456 | /* 1. Allocate space for next generation rules_gen_X[] */ |
6457 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
6458 | int ret; | |
37082f93 | 6459 | |
0cbc06b3 FW |
6460 | if (trans->msg_type == NFT_MSG_NEWRULE || |
6461 | trans->msg_type == NFT_MSG_DELRULE) { | |
6462 | chain = trans->ctx.chain; | |
6463 | ||
6464 | ret = nf_tables_commit_chain_prepare(net, chain); | |
6465 | if (ret < 0) { | |
6466 | nf_tables_commit_chain_prepare_cancel(net); | |
6467 | return ret; | |
6468 | } | |
6469 | } | |
6470 | } | |
37082f93 | 6471 | |
0cbc06b3 FW |
6472 | /* step 2. Make rules_gen_X visible to packet path */ |
6473 | list_for_each_entry(table, &net->nft.tables, list) { | |
0fb39bbe FW |
6474 | list_for_each_entry(chain, &table->chains, list) |
6475 | nf_tables_commit_chain(net, chain); | |
0cbc06b3 FW |
6476 | } |
6477 | ||
6478 | /* | |
6479 | * Bump generation counter, invalidate any dump in progress. | |
6480 | * Cannot fail after this point. | |
37082f93 | 6481 | */ |
0cbc06b3 FW |
6482 | while (++net->nft.base_seq == 0); |
6483 | ||
6484 | /* step 3. Start new generation, rules_gen_X now in use. */ | |
6485 | net->nft.gencursor = nft_gencursor_next(net); | |
37082f93 PNA |
6486 | |
6487 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 6488 | switch (trans->msg_type) { |
55dd6f93 PNA |
6489 | case NFT_MSG_NEWTABLE: |
6490 | if (nft_trans_table_update(trans)) { | |
6491 | if (!nft_trans_table_enable(trans)) { | |
664b0f8c | 6492 | nf_tables_table_disable(net, |
55dd6f93 PNA |
6493 | trans->ctx.table); |
6494 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
6495 | } | |
6496 | } else { | |
f2a6d766 | 6497 | nft_clear(net, trans->ctx.table); |
55dd6f93 | 6498 | } |
35151d84 | 6499 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
6500 | nft_trans_destroy(trans); |
6501 | break; | |
6502 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 6503 | list_del_rcu(&trans->ctx.table->list); |
35151d84 | 6504 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 6505 | break; |
91c7b38d | 6506 | case NFT_MSG_NEWCHAIN: |
9f8aac0b | 6507 | if (nft_trans_chain_update(trans)) { |
91c7b38d | 6508 | nft_chain_commit_update(trans); |
9f8aac0b FW |
6509 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
6510 | /* trans destroyed after rcu grace period */ | |
6511 | } else { | |
664b0f8c | 6512 | nft_clear(net, trans->ctx.chain); |
9f8aac0b FW |
6513 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
6514 | nft_trans_destroy(trans); | |
6515 | } | |
91c7b38d PNA |
6516 | break; |
6517 | case NFT_MSG_DELCHAIN: | |
1b2470e5 | 6518 | nft_chain_del(trans->ctx.chain); |
35151d84 | 6519 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
c974a3a3 PNA |
6520 | nf_tables_unregister_hook(trans->ctx.net, |
6521 | trans->ctx.table, | |
6522 | trans->ctx.chain); | |
91c7b38d | 6523 | break; |
b380e5c7 | 6524 | case NFT_MSG_NEWRULE: |
889f7ee7 | 6525 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
35151d84 | 6526 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 6527 | nft_trans_rule(trans), |
35151d84 | 6528 | NFT_MSG_NEWRULE); |
37082f93 | 6529 | nft_trans_destroy(trans); |
b380e5c7 PNA |
6530 | break; |
6531 | case NFT_MSG_DELRULE: | |
6532 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
6533 | nf_tables_rule_notify(&trans->ctx, |
6534 | nft_trans_rule(trans), | |
6535 | NFT_MSG_DELRULE); | |
b380e5c7 | 6536 | break; |
958bee14 | 6537 | case NFT_MSG_NEWSET: |
37a9cc52 | 6538 | nft_clear(net, nft_trans_set(trans)); |
4fefee57 PNA |
6539 | /* This avoids hitting -EBUSY when deleting the table |
6540 | * from the transaction. | |
6541 | */ | |
408070d6 | 6542 | if (nft_set_is_anonymous(nft_trans_set(trans)) && |
4fefee57 PNA |
6543 | !list_empty(&nft_trans_set(trans)->bindings)) |
6544 | trans->ctx.table->use--; | |
6545 | ||
958bee14 | 6546 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 6547 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
6548 | nft_trans_destroy(trans); |
6549 | break; | |
6550 | case NFT_MSG_DELSET: | |
37a9cc52 | 6551 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 | 6552 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 6553 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 6554 | break; |
60319eb1 | 6555 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
6556 | te = (struct nft_trans_elem *)trans->data; |
6557 | ||
42a55769 | 6558 | te->set->ops->activate(net, te->set, &te->elem); |
cc02e457 PM |
6559 | nf_tables_setelem_notify(&trans->ctx, te->set, |
6560 | &te->elem, | |
60319eb1 PNA |
6561 | NFT_MSG_NEWSETELEM, 0); |
6562 | nft_trans_destroy(trans); | |
6563 | break; | |
6564 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 6565 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 6566 | |
a3716e70 PNA |
6567 | nf_tables_setelem_notify(&trans->ctx, te->set, |
6568 | &te->elem, | |
60319eb1 | 6569 | NFT_MSG_DELSETELEM, 0); |
5cb82a38 | 6570 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a PM |
6571 | atomic_dec(&te->set->nelems); |
6572 | te->set->ndeact--; | |
60319eb1 | 6573 | break; |
e5009240 PNA |
6574 | case NFT_MSG_NEWOBJ: |
6575 | nft_clear(net, nft_trans_obj(trans)); | |
6576 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
6577 | NFT_MSG_NEWOBJ); | |
6578 | nft_trans_destroy(trans); | |
6579 | break; | |
6580 | case NFT_MSG_DELOBJ: | |
6581 | list_del_rcu(&nft_trans_obj(trans)->list); | |
6582 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
6583 | NFT_MSG_DELOBJ); | |
6584 | break; | |
3b49e2e9 PNA |
6585 | case NFT_MSG_NEWFLOWTABLE: |
6586 | nft_clear(net, nft_trans_flowtable(trans)); | |
6587 | nf_tables_flowtable_notify(&trans->ctx, | |
6588 | nft_trans_flowtable(trans), | |
6589 | NFT_MSG_NEWFLOWTABLE); | |
6590 | nft_trans_destroy(trans); | |
6591 | break; | |
6592 | case NFT_MSG_DELFLOWTABLE: | |
6593 | list_del_rcu(&nft_trans_flowtable(trans)->list); | |
6594 | nf_tables_flowtable_notify(&trans->ctx, | |
6595 | nft_trans_flowtable(trans), | |
6596 | NFT_MSG_DELFLOWTABLE); | |
6597 | nft_unregister_flowtable_net_hooks(net, | |
6598 | nft_trans_flowtable(trans)); | |
6599 | break; | |
37082f93 | 6600 | } |
37082f93 PNA |
6601 | } |
6602 | ||
84d7fce6 | 6603 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); |
0935d558 | 6604 | nf_tables_commit_release(net); |
37082f93 PNA |
6605 | |
6606 | return 0; | |
6607 | } | |
6608 | ||
b326dd37 | 6609 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 6610 | { |
c7c32e72 PNA |
6611 | switch (trans->msg_type) { |
6612 | case NFT_MSG_NEWTABLE: | |
6613 | nf_tables_table_destroy(&trans->ctx); | |
6614 | break; | |
6615 | case NFT_MSG_NEWCHAIN: | |
43a605f2 | 6616 | nf_tables_chain_destroy(&trans->ctx); |
c7c32e72 PNA |
6617 | break; |
6618 | case NFT_MSG_NEWRULE: | |
6619 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
6620 | break; | |
6621 | case NFT_MSG_NEWSET: | |
6622 | nft_set_destroy(nft_trans_set(trans)); | |
6623 | break; | |
61edafbb PM |
6624 | case NFT_MSG_NEWSETELEM: |
6625 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 6626 | nft_trans_elem(trans).priv, true); |
61edafbb | 6627 | break; |
e5009240 | 6628 | case NFT_MSG_NEWOBJ: |
00bfb320 | 6629 | nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); |
e5009240 | 6630 | break; |
3b49e2e9 PNA |
6631 | case NFT_MSG_NEWFLOWTABLE: |
6632 | nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); | |
6633 | break; | |
c7c32e72 PNA |
6634 | } |
6635 | kfree(trans); | |
6636 | } | |
6637 | ||
71ad00c5 | 6638 | static int __nf_tables_abort(struct net *net) |
37082f93 | 6639 | { |
37082f93 | 6640 | struct nft_trans *trans, *next; |
02263db0 | 6641 | struct nft_trans_elem *te; |
37082f93 | 6642 | |
a907e36d XL |
6643 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
6644 | list) { | |
b380e5c7 | 6645 | switch (trans->msg_type) { |
55dd6f93 PNA |
6646 | case NFT_MSG_NEWTABLE: |
6647 | if (nft_trans_table_update(trans)) { | |
6648 | if (nft_trans_table_enable(trans)) { | |
664b0f8c | 6649 | nf_tables_table_disable(net, |
55dd6f93 PNA |
6650 | trans->ctx.table); |
6651 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
6652 | } | |
6653 | nft_trans_destroy(trans); | |
6654 | } else { | |
e688a7f8 | 6655 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
6656 | } |
6657 | break; | |
6658 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 6659 | nft_clear(trans->ctx.net, trans->ctx.table); |
55dd6f93 PNA |
6660 | nft_trans_destroy(trans); |
6661 | break; | |
91c7b38d PNA |
6662 | case NFT_MSG_NEWCHAIN: |
6663 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 6664 | free_percpu(nft_trans_chain_stats(trans)); |
9f8aac0b | 6665 | kfree(nft_trans_chain_name(trans)); |
91c7b38d PNA |
6666 | nft_trans_destroy(trans); |
6667 | } else { | |
4fefee57 | 6668 | trans->ctx.table->use--; |
1b2470e5 | 6669 | nft_chain_del(trans->ctx.chain); |
c974a3a3 PNA |
6670 | nf_tables_unregister_hook(trans->ctx.net, |
6671 | trans->ctx.table, | |
6672 | trans->ctx.chain); | |
91c7b38d PNA |
6673 | } |
6674 | break; | |
6675 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 6676 | trans->ctx.table->use++; |
664b0f8c | 6677 | nft_clear(trans->ctx.net, trans->ctx.chain); |
91c7b38d PNA |
6678 | nft_trans_destroy(trans); |
6679 | break; | |
b380e5c7 | 6680 | case NFT_MSG_NEWRULE: |
4fefee57 | 6681 | trans->ctx.chain->use--; |
b380e5c7 | 6682 | list_del_rcu(&nft_trans_rule(trans)->list); |
bb7b40ae | 6683 | nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans)); |
b380e5c7 PNA |
6684 | break; |
6685 | case NFT_MSG_DELRULE: | |
4fefee57 | 6686 | trans->ctx.chain->use++; |
889f7ee7 | 6687 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
bb7b40ae | 6688 | nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans)); |
37082f93 | 6689 | nft_trans_destroy(trans); |
b380e5c7 | 6690 | break; |
958bee14 | 6691 | case NFT_MSG_NEWSET: |
4fefee57 | 6692 | trans->ctx.table->use--; |
e688a7f8 | 6693 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
6694 | break; |
6695 | case NFT_MSG_DELSET: | |
4fefee57 | 6696 | trans->ctx.table->use++; |
37a9cc52 | 6697 | nft_clear(trans->ctx.net, nft_trans_set(trans)); |
958bee14 PNA |
6698 | nft_trans_destroy(trans); |
6699 | break; | |
60319eb1 | 6700 | case NFT_MSG_NEWSETELEM: |
02263db0 | 6701 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 6702 | |
5cb82a38 | 6703 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a | 6704 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
6705 | break; |
6706 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
6707 | te = (struct nft_trans_elem *)trans->data; |
6708 | ||
59105446 | 6709 | nft_set_elem_activate(net, te->set, &te->elem); |
42a55769 | 6710 | te->set->ops->activate(net, te->set, &te->elem); |
3dd0673a | 6711 | te->set->ndeact--; |
cc02e457 | 6712 | |
e5009240 PNA |
6713 | nft_trans_destroy(trans); |
6714 | break; | |
6715 | case NFT_MSG_NEWOBJ: | |
6716 | trans->ctx.table->use--; | |
6717 | list_del_rcu(&nft_trans_obj(trans)->list); | |
6718 | break; | |
6719 | case NFT_MSG_DELOBJ: | |
6720 | trans->ctx.table->use++; | |
6721 | nft_clear(trans->ctx.net, nft_trans_obj(trans)); | |
60319eb1 PNA |
6722 | nft_trans_destroy(trans); |
6723 | break; | |
3b49e2e9 PNA |
6724 | case NFT_MSG_NEWFLOWTABLE: |
6725 | trans->ctx.table->use--; | |
6726 | list_del_rcu(&nft_trans_flowtable(trans)->list); | |
6727 | nft_unregister_flowtable_net_hooks(net, | |
6728 | nft_trans_flowtable(trans)); | |
6729 | break; | |
6730 | case NFT_MSG_DELFLOWTABLE: | |
6731 | trans->ctx.table->use++; | |
6732 | nft_clear(trans->ctx.net, nft_trans_flowtable(trans)); | |
6733 | nft_trans_destroy(trans); | |
6734 | break; | |
37082f93 | 6735 | } |
37082f93 PNA |
6736 | } |
6737 | ||
b326dd37 PNA |
6738 | synchronize_rcu(); |
6739 | ||
a1cee076 PNA |
6740 | list_for_each_entry_safe_reverse(trans, next, |
6741 | &net->nft.commit_list, list) { | |
c7c32e72 | 6742 | list_del(&trans->list); |
b326dd37 | 6743 | nf_tables_abort_release(trans); |
37082f93 PNA |
6744 | } |
6745 | ||
6746 | return 0; | |
6747 | } | |
6748 | ||
a654de8f PNA |
6749 | static void nf_tables_cleanup(struct net *net) |
6750 | { | |
6751 | nft_validate_state_update(net, NFT_VALIDATE_SKIP); | |
6752 | } | |
6753 | ||
71ad00c5 FW |
6754 | static int nf_tables_abort(struct net *net, struct sk_buff *skb) |
6755 | { | |
f102d66b FW |
6756 | int ret = __nf_tables_abort(net); |
6757 | ||
6758 | mutex_unlock(&net->nft.commit_mutex); | |
6759 | ||
6760 | return ret; | |
71ad00c5 FW |
6761 | } |
6762 | ||
74e8bcd2 PNA |
6763 | static bool nf_tables_valid_genid(struct net *net, u32 genid) |
6764 | { | |
f102d66b FW |
6765 | bool genid_ok; |
6766 | ||
6767 | mutex_lock(&net->nft.commit_mutex); | |
6768 | ||
6769 | genid_ok = genid == 0 || net->nft.base_seq == genid; | |
6770 | if (!genid_ok) | |
6771 | mutex_unlock(&net->nft.commit_mutex); | |
6772 | ||
6773 | /* else, commit mutex has to be released by commit or abort function */ | |
6774 | return genid_ok; | |
74e8bcd2 PNA |
6775 | } |
6776 | ||
96518518 PM |
6777 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
6778 | .name = "nf_tables", | |
6779 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
6780 | .cb_count = NFT_MSG_MAX, | |
6781 | .cb = nf_tables_cb, | |
0628b123 PNA |
6782 | .commit = nf_tables_commit, |
6783 | .abort = nf_tables_abort, | |
a654de8f | 6784 | .cleanup = nf_tables_cleanup, |
74e8bcd2 | 6785 | .valid_genid = nf_tables_valid_genid, |
be2ab5b4 | 6786 | .owner = THIS_MODULE, |
96518518 PM |
6787 | }; |
6788 | ||
7210e4e3 | 6789 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
32537e91 | 6790 | enum nft_chain_types type) |
7210e4e3 PNA |
6791 | { |
6792 | const struct nft_base_chain *basechain; | |
6793 | ||
f323d954 | 6794 | if (nft_is_base_chain(chain)) { |
7210e4e3 PNA |
6795 | basechain = nft_base_chain(chain); |
6796 | if (basechain->type->type != type) | |
6797 | return -EOPNOTSUPP; | |
6798 | } | |
6799 | return 0; | |
6800 | } | |
6801 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
6802 | ||
75e8d06d PNA |
6803 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
6804 | unsigned int hook_flags) | |
6805 | { | |
6806 | struct nft_base_chain *basechain; | |
6807 | ||
f323d954 | 6808 | if (nft_is_base_chain(chain)) { |
75e8d06d PNA |
6809 | basechain = nft_base_chain(chain); |
6810 | ||
c974a3a3 | 6811 | if ((1 << basechain->ops.hooknum) & hook_flags) |
75e8d06d PNA |
6812 | return 0; |
6813 | ||
6814 | return -EOPNOTSUPP; | |
6815 | } | |
6816 | ||
6817 | return 0; | |
6818 | } | |
6819 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
6820 | ||
20a69341 PM |
6821 | /* |
6822 | * Loop detection - walk through the ruleset beginning at the destination chain | |
6823 | * of a new jump until either the source chain is reached (loop) or all | |
6824 | * reachable chains have been traversed. | |
6825 | * | |
6826 | * The loop check is performed whenever a new jump verdict is added to an | |
6827 | * expression or verdict map or a verdict map is bound to a new chain. | |
6828 | */ | |
6829 | ||
6830 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
6831 | const struct nft_chain *chain); | |
6832 | ||
6833 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 6834 | struct nft_set *set, |
20a69341 | 6835 | const struct nft_set_iter *iter, |
de70185d | 6836 | struct nft_set_elem *elem) |
20a69341 | 6837 | { |
fe2811eb PM |
6838 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
6839 | const struct nft_data *data; | |
6840 | ||
6841 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
6842 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
6843 | return 0; |
6844 | ||
fe2811eb | 6845 | data = nft_set_ext_data(ext); |
1ca2e170 | 6846 | switch (data->verdict.code) { |
20a69341 PM |
6847 | case NFT_JUMP: |
6848 | case NFT_GOTO: | |
1ca2e170 | 6849 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
6850 | default: |
6851 | return 0; | |
6852 | } | |
6853 | } | |
6854 | ||
6855 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
6856 | const struct nft_chain *chain) | |
6857 | { | |
6858 | const struct nft_rule *rule; | |
6859 | const struct nft_expr *expr, *last; | |
de70185d | 6860 | struct nft_set *set; |
20a69341 PM |
6861 | struct nft_set_binding *binding; |
6862 | struct nft_set_iter iter; | |
20a69341 PM |
6863 | |
6864 | if (ctx->chain == chain) | |
6865 | return -ELOOP; | |
6866 | ||
6867 | list_for_each_entry(rule, &chain->rules, list) { | |
6868 | nft_rule_for_each_expr(expr, last, rule) { | |
a654de8f PNA |
6869 | struct nft_immediate_expr *priv; |
6870 | const struct nft_data *data; | |
0ca743a5 PNA |
6871 | int err; |
6872 | ||
a654de8f | 6873 | if (strcmp(expr->ops->type->name, "immediate")) |
20a69341 PM |
6874 | continue; |
6875 | ||
a654de8f PNA |
6876 | priv = nft_expr_priv(expr); |
6877 | if (priv->dreg != NFT_REG_VERDICT) | |
0ca743a5 | 6878 | continue; |
20a69341 | 6879 | |
a654de8f | 6880 | data = &priv->data; |
1ca2e170 | 6881 | switch (data->verdict.code) { |
20a69341 PM |
6882 | case NFT_JUMP: |
6883 | case NFT_GOTO: | |
1ca2e170 PM |
6884 | err = nf_tables_check_loops(ctx, |
6885 | data->verdict.chain); | |
20a69341 PM |
6886 | if (err < 0) |
6887 | return err; | |
6888 | default: | |
6889 | break; | |
6890 | } | |
6891 | } | |
6892 | } | |
6893 | ||
6894 | list_for_each_entry(set, &ctx->table->sets, list) { | |
37a9cc52 PNA |
6895 | if (!nft_is_active_next(ctx->net, set)) |
6896 | continue; | |
20a69341 PM |
6897 | if (!(set->flags & NFT_SET_MAP) || |
6898 | set->dtype != NFT_DATA_VERDICT) | |
6899 | continue; | |
6900 | ||
6901 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
6902 | if (!(binding->flags & NFT_SET_MAP) || |
6903 | binding->chain != chain) | |
20a69341 PM |
6904 | continue; |
6905 | ||
8588ac09 | 6906 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
6907 | iter.skip = 0; |
6908 | iter.count = 0; | |
6909 | iter.err = 0; | |
6910 | iter.fn = nf_tables_loop_check_setelem; | |
6911 | ||
6912 | set->ops->walk(ctx, set, &iter); | |
6913 | if (iter.err < 0) | |
6914 | return iter.err; | |
6915 | } | |
6916 | } | |
6917 | ||
6918 | return 0; | |
6919 | } | |
6920 | ||
36b701fa LGL |
6921 | /** |
6922 | * nft_parse_u32_check - fetch u32 attribute and check for maximum value | |
6923 | * | |
6924 | * @attr: netlink attribute to fetch value from | |
6925 | * @max: maximum value to be stored in dest | |
6926 | * @dest: pointer to the variable | |
6927 | * | |
6928 | * Parse, check and store a given u32 netlink attribute into variable. | |
6929 | * This function returns -ERANGE if the value goes over maximum value. | |
6930 | * Otherwise a 0 is returned and the attribute value is stored in the | |
6931 | * destination variable. | |
6932 | */ | |
f1d505bb | 6933 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) |
36b701fa | 6934 | { |
09525a09 | 6935 | u32 val; |
36b701fa LGL |
6936 | |
6937 | val = ntohl(nla_get_be32(attr)); | |
6938 | if (val > max) | |
6939 | return -ERANGE; | |
6940 | ||
6941 | *dest = val; | |
6942 | return 0; | |
6943 | } | |
6944 | EXPORT_SYMBOL_GPL(nft_parse_u32_check); | |
6945 | ||
49499c3e PM |
6946 | /** |
6947 | * nft_parse_register - parse a register value from a netlink attribute | |
6948 | * | |
6949 | * @attr: netlink attribute | |
6950 | * | |
6951 | * Parse and translate a register value from a netlink attribute. | |
6952 | * Registers used to be 128 bit wide, these register numbers will be | |
6953 | * mapped to the corresponding 32 bit register numbers. | |
6954 | */ | |
b1c96ed3 PM |
6955 | unsigned int nft_parse_register(const struct nlattr *attr) |
6956 | { | |
49499c3e PM |
6957 | unsigned int reg; |
6958 | ||
6959 | reg = ntohl(nla_get_be32(attr)); | |
6960 | switch (reg) { | |
6961 | case NFT_REG_VERDICT...NFT_REG_4: | |
6962 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
6963 | default: | |
6964 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
6965 | } | |
b1c96ed3 PM |
6966 | } |
6967 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
6968 | ||
49499c3e PM |
6969 | /** |
6970 | * nft_dump_register - dump a register value to a netlink attribute | |
6971 | * | |
6972 | * @skb: socket buffer | |
6973 | * @attr: attribute number | |
6974 | * @reg: register number | |
6975 | * | |
6976 | * Construct a netlink attribute containing the register number. For | |
6977 | * compatibility reasons, register numbers being a multiple of 4 are | |
6978 | * translated to the corresponding 128 bit register numbers. | |
6979 | */ | |
b1c96ed3 PM |
6980 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
6981 | { | |
49499c3e PM |
6982 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
6983 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
6984 | else | |
6985 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
6986 | ||
b1c96ed3 PM |
6987 | return nla_put_be32(skb, attr, htonl(reg)); |
6988 | } | |
6989 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
6990 | ||
96518518 | 6991 | /** |
d07db988 | 6992 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
6993 | * |
6994 | * @reg: the register number | |
d07db988 | 6995 | * @len: the length of the data |
96518518 PM |
6996 | * |
6997 | * Validate that the input register is one of the general purpose | |
d07db988 | 6998 | * registers and that the length of the load is within the bounds. |
96518518 | 6999 | */ |
d07db988 | 7000 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 7001 | { |
49499c3e | 7002 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 7003 | return -EINVAL; |
d07db988 PM |
7004 | if (len == 0) |
7005 | return -EINVAL; | |
49499c3e | 7006 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 7007 | return -ERANGE; |
49499c3e | 7008 | |
96518518 PM |
7009 | return 0; |
7010 | } | |
d07db988 | 7011 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 7012 | |
96518518 | 7013 | /** |
1ec10212 | 7014 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
7015 | * |
7016 | * @ctx: context of the expression performing the load | |
7017 | * @reg: the destination register number | |
7018 | * @data: the data to load | |
7019 | * @type: the data type | |
45d9bcda | 7020 | * @len: the length of the data |
96518518 PM |
7021 | * |
7022 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
7023 | * the destination register and the length is within the bounds. |
7024 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 7025 | * data. |
96518518 | 7026 | */ |
1ec10212 PM |
7027 | int nft_validate_register_store(const struct nft_ctx *ctx, |
7028 | enum nft_registers reg, | |
7029 | const struct nft_data *data, | |
7030 | enum nft_data_types type, unsigned int len) | |
96518518 | 7031 | { |
20a69341 PM |
7032 | int err; |
7033 | ||
96518518 PM |
7034 | switch (reg) { |
7035 | case NFT_REG_VERDICT: | |
58f40ab6 | 7036 | if (type != NFT_DATA_VERDICT) |
96518518 | 7037 | return -EINVAL; |
20a69341 | 7038 | |
58f40ab6 | 7039 | if (data != NULL && |
1ca2e170 PM |
7040 | (data->verdict.code == NFT_GOTO || |
7041 | data->verdict.code == NFT_JUMP)) { | |
7042 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
7043 | if (err < 0) |
7044 | return err; | |
20a69341 PM |
7045 | } |
7046 | ||
96518518 PM |
7047 | return 0; |
7048 | default: | |
49499c3e | 7049 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 7050 | return -EINVAL; |
45d9bcda PM |
7051 | if (len == 0) |
7052 | return -EINVAL; | |
49499c3e PM |
7053 | if (reg * NFT_REG32_SIZE + len > |
7054 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 7055 | return -ERANGE; |
27e6d201 | 7056 | |
96518518 PM |
7057 | if (data != NULL && type != NFT_DATA_VALUE) |
7058 | return -EINVAL; | |
7059 | return 0; | |
7060 | } | |
7061 | } | |
1ec10212 | 7062 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
7063 | |
7064 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
7065 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
7066 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
7067 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
7068 | }; | |
7069 | ||
7070 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
7071 | struct nft_data_desc *desc, const struct nlattr *nla) | |
7072 | { | |
664b0f8c | 7073 | u8 genmask = nft_genmask_next(ctx->net); |
96518518 PM |
7074 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
7075 | struct nft_chain *chain; | |
7076 | int err; | |
7077 | ||
fceb6435 JB |
7078 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy, |
7079 | NULL); | |
96518518 PM |
7080 | if (err < 0) |
7081 | return err; | |
7082 | ||
7083 | if (!tb[NFTA_VERDICT_CODE]) | |
7084 | return -EINVAL; | |
1ca2e170 | 7085 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 7086 | |
1ca2e170 | 7087 | switch (data->verdict.code) { |
e0abdadc | 7088 | default: |
1ca2e170 | 7089 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
7090 | case NF_ACCEPT: |
7091 | case NF_DROP: | |
7092 | case NF_QUEUE: | |
7093 | break; | |
7094 | default: | |
7095 | return -EINVAL; | |
7096 | } | |
7097 | /* fall through */ | |
96518518 PM |
7098 | case NFT_CONTINUE: |
7099 | case NFT_BREAK: | |
7100 | case NFT_RETURN: | |
96518518 PM |
7101 | break; |
7102 | case NFT_JUMP: | |
7103 | case NFT_GOTO: | |
7104 | if (!tb[NFTA_VERDICT_CHAIN]) | |
7105 | return -EINVAL; | |
f102d66b FW |
7106 | chain = nft_chain_lookup(ctx->net, ctx->table, |
7107 | tb[NFTA_VERDICT_CHAIN], genmask); | |
96518518 PM |
7108 | if (IS_ERR(chain)) |
7109 | return PTR_ERR(chain); | |
f323d954 | 7110 | if (nft_is_base_chain(chain)) |
96518518 PM |
7111 | return -EOPNOTSUPP; |
7112 | ||
96518518 | 7113 | chain->use++; |
1ca2e170 | 7114 | data->verdict.chain = chain; |
96518518 | 7115 | break; |
96518518 PM |
7116 | } |
7117 | ||
4c4ed074 | 7118 | desc->len = sizeof(data->verdict); |
96518518 PM |
7119 | desc->type = NFT_DATA_VERDICT; |
7120 | return 0; | |
7121 | } | |
7122 | ||
7123 | static void nft_verdict_uninit(const struct nft_data *data) | |
7124 | { | |
1ca2e170 | 7125 | switch (data->verdict.code) { |
96518518 PM |
7126 | case NFT_JUMP: |
7127 | case NFT_GOTO: | |
1ca2e170 | 7128 | data->verdict.chain->use--; |
96518518 PM |
7129 | break; |
7130 | } | |
7131 | } | |
7132 | ||
33d5a7b1 | 7133 | int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) |
96518518 PM |
7134 | { |
7135 | struct nlattr *nest; | |
7136 | ||
33d5a7b1 | 7137 | nest = nla_nest_start(skb, type); |
96518518 PM |
7138 | if (!nest) |
7139 | goto nla_put_failure; | |
7140 | ||
33d5a7b1 | 7141 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) |
96518518 PM |
7142 | goto nla_put_failure; |
7143 | ||
33d5a7b1 | 7144 | switch (v->code) { |
96518518 PM |
7145 | case NFT_JUMP: |
7146 | case NFT_GOTO: | |
1ca2e170 | 7147 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
33d5a7b1 | 7148 | v->chain->name)) |
96518518 PM |
7149 | goto nla_put_failure; |
7150 | } | |
7151 | nla_nest_end(skb, nest); | |
7152 | return 0; | |
7153 | ||
7154 | nla_put_failure: | |
7155 | return -1; | |
7156 | } | |
7157 | ||
d0a11fc3 PM |
7158 | static int nft_value_init(const struct nft_ctx *ctx, |
7159 | struct nft_data *data, unsigned int size, | |
96518518 PM |
7160 | struct nft_data_desc *desc, const struct nlattr *nla) |
7161 | { | |
7162 | unsigned int len; | |
7163 | ||
7164 | len = nla_len(nla); | |
7165 | if (len == 0) | |
7166 | return -EINVAL; | |
d0a11fc3 | 7167 | if (len > size) |
96518518 PM |
7168 | return -EOVERFLOW; |
7169 | ||
d0a11fc3 | 7170 | nla_memcpy(data->data, nla, len); |
96518518 PM |
7171 | desc->type = NFT_DATA_VALUE; |
7172 | desc->len = len; | |
7173 | return 0; | |
7174 | } | |
7175 | ||
7176 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
7177 | unsigned int len) | |
7178 | { | |
7179 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
7180 | } | |
7181 | ||
7182 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 7183 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
7184 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
7185 | }; | |
7186 | ||
7187 | /** | |
7188 | * nft_data_init - parse nf_tables data netlink attributes | |
7189 | * | |
7190 | * @ctx: context of the expression using the data | |
7191 | * @data: destination struct nft_data | |
d0a11fc3 | 7192 | * @size: maximum data length |
96518518 PM |
7193 | * @desc: data description |
7194 | * @nla: netlink attribute containing data | |
7195 | * | |
7196 | * Parse the netlink data attributes and initialize a struct nft_data. | |
7197 | * The type and length of data are returned in the data description. | |
7198 | * | |
7199 | * The caller can indicate that it only wants to accept data of type | |
7200 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
7201 | */ | |
d0a11fc3 PM |
7202 | int nft_data_init(const struct nft_ctx *ctx, |
7203 | struct nft_data *data, unsigned int size, | |
96518518 PM |
7204 | struct nft_data_desc *desc, const struct nlattr *nla) |
7205 | { | |
7206 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
7207 | int err; | |
7208 | ||
fceb6435 | 7209 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL); |
96518518 PM |
7210 | if (err < 0) |
7211 | return err; | |
7212 | ||
7213 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
7214 | return nft_value_init(ctx, data, size, desc, |
7215 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
7216 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
7217 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
7218 | return -EINVAL; | |
7219 | } | |
7220 | EXPORT_SYMBOL_GPL(nft_data_init); | |
7221 | ||
7222 | /** | |
59105446 | 7223 | * nft_data_release - release a nft_data item |
96518518 PM |
7224 | * |
7225 | * @data: struct nft_data to release | |
7226 | * @type: type of data | |
7227 | * | |
7228 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
7229 | * all others need to be released by calling this function. | |
7230 | */ | |
59105446 | 7231 | void nft_data_release(const struct nft_data *data, enum nft_data_types type) |
96518518 | 7232 | { |
960bd2c2 | 7233 | if (type < NFT_DATA_VERDICT) |
96518518 | 7234 | return; |
960bd2c2 | 7235 | switch (type) { |
96518518 PM |
7236 | case NFT_DATA_VERDICT: |
7237 | return nft_verdict_uninit(data); | |
7238 | default: | |
7239 | WARN_ON(1); | |
7240 | } | |
7241 | } | |
59105446 | 7242 | EXPORT_SYMBOL_GPL(nft_data_release); |
96518518 PM |
7243 | |
7244 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
7245 | enum nft_data_types type, unsigned int len) | |
7246 | { | |
7247 | struct nlattr *nest; | |
7248 | int err; | |
7249 | ||
7250 | nest = nla_nest_start(skb, attr); | |
7251 | if (nest == NULL) | |
7252 | return -1; | |
7253 | ||
7254 | switch (type) { | |
7255 | case NFT_DATA_VALUE: | |
7256 | err = nft_value_dump(skb, data, len); | |
7257 | break; | |
7258 | case NFT_DATA_VERDICT: | |
33d5a7b1 | 7259 | err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); |
96518518 PM |
7260 | break; |
7261 | default: | |
7262 | err = -EINVAL; | |
7263 | WARN_ON(1); | |
7264 | } | |
7265 | ||
7266 | nla_nest_end(skb, nest); | |
7267 | return err; | |
7268 | } | |
7269 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
7270 | ||
5ebe0b0e PNA |
7271 | int __nft_release_basechain(struct nft_ctx *ctx) |
7272 | { | |
7273 | struct nft_rule *rule, *nr; | |
7274 | ||
fa5950e4 FW |
7275 | if (WARN_ON(!nft_is_base_chain(ctx->chain))) |
7276 | return 0; | |
5ebe0b0e | 7277 | |
c974a3a3 | 7278 | nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain); |
5ebe0b0e PNA |
7279 | list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { |
7280 | list_del(&rule->list); | |
7281 | ctx->chain->use--; | |
bb7b40ae | 7282 | nf_tables_rule_release(ctx, rule); |
5ebe0b0e | 7283 | } |
1b2470e5 | 7284 | nft_chain_del(ctx->chain); |
5ebe0b0e | 7285 | ctx->table->use--; |
43a605f2 | 7286 | nf_tables_chain_destroy(ctx); |
5ebe0b0e PNA |
7287 | |
7288 | return 0; | |
7289 | } | |
7290 | EXPORT_SYMBOL_GPL(__nft_release_basechain); | |
7291 | ||
98319cb9 | 7292 | static void __nft_release_tables(struct net *net) |
df05ef87 | 7293 | { |
3b49e2e9 | 7294 | struct nft_flowtable *flowtable, *nf; |
df05ef87 PNA |
7295 | struct nft_table *table, *nt; |
7296 | struct nft_chain *chain, *nc; | |
e5009240 | 7297 | struct nft_object *obj, *ne; |
df05ef87 PNA |
7298 | struct nft_rule *rule, *nr; |
7299 | struct nft_set *set, *ns; | |
7300 | struct nft_ctx ctx = { | |
7301 | .net = net, | |
43a605f2 | 7302 | .family = NFPROTO_NETDEV, |
df05ef87 PNA |
7303 | }; |
7304 | ||
36596dad | 7305 | list_for_each_entry_safe(table, nt, &net->nft.tables, list) { |
98319cb9 | 7306 | ctx.family = table->family; |
dd4cbef7 | 7307 | |
df05ef87 | 7308 | list_for_each_entry(chain, &table->chains, list) |
c974a3a3 | 7309 | nf_tables_unregister_hook(net, table, chain); |
df05ef87 PNA |
7310 | /* No packets are walking on these chains anymore. */ |
7311 | ctx.table = table; | |
7312 | list_for_each_entry(chain, &table->chains, list) { | |
7313 | ctx.chain = chain; | |
7314 | list_for_each_entry_safe(rule, nr, &chain->rules, list) { | |
7315 | list_del(&rule->list); | |
7316 | chain->use--; | |
bb7b40ae | 7317 | nf_tables_rule_release(&ctx, rule); |
df05ef87 PNA |
7318 | } |
7319 | } | |
3b49e2e9 PNA |
7320 | list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) { |
7321 | list_del(&flowtable->list); | |
7322 | table->use--; | |
7323 | nf_tables_flowtable_destroy(flowtable); | |
7324 | } | |
df05ef87 PNA |
7325 | list_for_each_entry_safe(set, ns, &table->sets, list) { |
7326 | list_del(&set->list); | |
7327 | table->use--; | |
7328 | nft_set_destroy(set); | |
7329 | } | |
e5009240 PNA |
7330 | list_for_each_entry_safe(obj, ne, &table->objects, list) { |
7331 | list_del(&obj->list); | |
7332 | table->use--; | |
00bfb320 | 7333 | nft_obj_destroy(&ctx, obj); |
e5009240 | 7334 | } |
df05ef87 | 7335 | list_for_each_entry_safe(chain, nc, &table->chains, list) { |
43a605f2 | 7336 | ctx.chain = chain; |
1b2470e5 | 7337 | nft_chain_del(chain); |
df05ef87 | 7338 | table->use--; |
43a605f2 | 7339 | nf_tables_chain_destroy(&ctx); |
df05ef87 PNA |
7340 | } |
7341 | list_del(&table->list); | |
7342 | nf_tables_table_destroy(&ctx); | |
7343 | } | |
7344 | } | |
7345 | ||
dd4cbef7 PNA |
7346 | static int __net_init nf_tables_init_net(struct net *net) |
7347 | { | |
7348 | INIT_LIST_HEAD(&net->nft.tables); | |
7349 | INIT_LIST_HEAD(&net->nft.commit_list); | |
f102d66b | 7350 | mutex_init(&net->nft.commit_mutex); |
dd4cbef7 | 7351 | net->nft.base_seq = 1; |
a654de8f PNA |
7352 | net->nft.validate_state = NFT_VALIDATE_SKIP; |
7353 | ||
dd4cbef7 PNA |
7354 | return 0; |
7355 | } | |
7356 | ||
7357 | static void __net_exit nf_tables_exit_net(struct net *net) | |
7358 | { | |
f102d66b | 7359 | mutex_lock(&net->nft.commit_mutex); |
71ad00c5 FW |
7360 | if (!list_empty(&net->nft.commit_list)) |
7361 | __nf_tables_abort(net); | |
98319cb9 | 7362 | __nft_release_tables(net); |
f102d66b | 7363 | mutex_unlock(&net->nft.commit_mutex); |
dd4cbef7 | 7364 | WARN_ON_ONCE(!list_empty(&net->nft.tables)); |
dd4cbef7 PNA |
7365 | } |
7366 | ||
99633ab2 PNA |
7367 | static struct pernet_operations nf_tables_net_ops = { |
7368 | .init = nf_tables_init_net, | |
613d0776 | 7369 | .exit = nf_tables_exit_net, |
99633ab2 PNA |
7370 | }; |
7371 | ||
96518518 PM |
7372 | static int __init nf_tables_module_init(void) |
7373 | { | |
7374 | int err; | |
7375 | ||
0935d558 | 7376 | spin_lock_init(&nf_tables_destroy_list_lock); |
d209df3e FW |
7377 | err = register_pernet_subsys(&nf_tables_net_ops); |
7378 | if (err < 0) | |
7379 | return err; | |
7380 | ||
7381 | err = nft_chain_filter_init(); | |
7382 | if (err < 0) | |
7383 | goto err1; | |
02c7b25e | 7384 | |
96518518 PM |
7385 | err = nf_tables_core_module_init(); |
7386 | if (err < 0) | |
d209df3e | 7387 | goto err2; |
96518518 | 7388 | |
d209df3e | 7389 | err = register_netdevice_notifier(&nf_tables_flowtable_notifier); |
96518518 | 7390 | if (err < 0) |
d209df3e | 7391 | goto err3; |
96518518 | 7392 | |
d209df3e FW |
7393 | /* must be last */ |
7394 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
7395 | if (err < 0) | |
7396 | goto err4; | |
3b49e2e9 | 7397 | |
d209df3e FW |
7398 | return err; |
7399 | err4: | |
7400 | unregister_netdevice_notifier(&nf_tables_flowtable_notifier); | |
7401 | err3: | |
96518518 | 7402 | nf_tables_core_module_exit(); |
d209df3e FW |
7403 | err2: |
7404 | nft_chain_filter_fini(); | |
7405 | err1: | |
7406 | unregister_pernet_subsys(&nf_tables_net_ops); | |
96518518 PM |
7407 | return err; |
7408 | } | |
7409 | ||
7410 | static void __exit nf_tables_module_exit(void) | |
7411 | { | |
7412 | nfnetlink_subsys_unregister(&nf_tables_subsys); | |
3b49e2e9 | 7413 | unregister_netdevice_notifier(&nf_tables_flowtable_notifier); |
0a2cf5ee | 7414 | nft_chain_filter_fini(); |
71ad00c5 | 7415 | unregister_pernet_subsys(&nf_tables_net_ops); |
0935d558 | 7416 | cancel_work_sync(&trans_destroy_work); |
1b1bc49c | 7417 | rcu_barrier(); |
96518518 | 7418 | nf_tables_core_module_exit(); |
96518518 PM |
7419 | } |
7420 | ||
7421 | module_init(nf_tables_module_init); | |
7422 | module_exit(nf_tables_module_exit); | |
7423 | ||
7424 | MODULE_LICENSE("GPL"); | |
7425 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
7426 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |