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Commit | Line | Data |
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96518518 | 1 | /* |
20a69341 | 2 | * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netlink.h> | |
1ff75a3e | 16 | #include <linux/vmalloc.h> |
96518518 PM |
17 | #include <linux/netfilter.h> |
18 | #include <linux/netfilter/nfnetlink.h> | |
19 | #include <linux/netfilter/nf_tables.h> | |
3b49e2e9 | 20 | #include <net/netfilter/nf_flow_table.h> |
96518518 PM |
21 | #include <net/netfilter/nf_tables_core.h> |
22 | #include <net/netfilter/nf_tables.h> | |
99633ab2 | 23 | #include <net/net_namespace.h> |
96518518 PM |
24 | #include <net/sock.h> |
25 | ||
96518518 | 26 | static LIST_HEAD(nf_tables_expressions); |
e5009240 | 27 | static LIST_HEAD(nf_tables_objects); |
3b49e2e9 | 28 | static LIST_HEAD(nf_tables_flowtables); |
3ecbfd65 | 29 | static u64 table_handle; |
96518518 | 30 | |
7c95f6d8 | 31 | static void nft_ctx_init(struct nft_ctx *ctx, |
633c9a84 | 32 | struct net *net, |
7c95f6d8 PNA |
33 | const struct sk_buff *skb, |
34 | const struct nlmsghdr *nlh, | |
36596dad | 35 | u8 family, |
7c95f6d8 PNA |
36 | struct nft_table *table, |
37 | struct nft_chain *chain, | |
38 | const struct nlattr * const *nla) | |
39 | { | |
633c9a84 | 40 | ctx->net = net; |
36596dad | 41 | ctx->family = family; |
128ad332 PNA |
42 | ctx->table = table; |
43 | ctx->chain = chain; | |
44 | ctx->nla = nla; | |
45 | ctx->portid = NETLINK_CB(skb).portid; | |
46 | ctx->report = nlmsg_report(nlh); | |
47 | ctx->seq = nlh->nlmsg_seq; | |
7c95f6d8 PNA |
48 | } |
49 | ||
8411b644 PNA |
50 | static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx, |
51 | int msg_type, u32 size, gfp_t gfp) | |
1081d11b PNA |
52 | { |
53 | struct nft_trans *trans; | |
54 | ||
8411b644 | 55 | trans = kzalloc(sizeof(struct nft_trans) + size, gfp); |
1081d11b PNA |
56 | if (trans == NULL) |
57 | return NULL; | |
58 | ||
b380e5c7 | 59 | trans->msg_type = msg_type; |
1081d11b PNA |
60 | trans->ctx = *ctx; |
61 | ||
62 | return trans; | |
63 | } | |
64 | ||
8411b644 PNA |
65 | static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx, |
66 | int msg_type, u32 size) | |
67 | { | |
68 | return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL); | |
69 | } | |
70 | ||
1081d11b PNA |
71 | static void nft_trans_destroy(struct nft_trans *trans) |
72 | { | |
73 | list_del(&trans->list); | |
74 | kfree(trans); | |
75 | } | |
76 | ||
c974a3a3 PNA |
77 | static int nf_tables_register_hook(struct net *net, |
78 | const struct nft_table *table, | |
79 | struct nft_chain *chain) | |
d8ee8f7c PNA |
80 | { |
81 | if (table->flags & NFT_TABLE_F_DORMANT || | |
f323d954 | 82 | !nft_is_base_chain(chain)) |
d8ee8f7c PNA |
83 | return 0; |
84 | ||
c974a3a3 | 85 | return nf_register_net_hook(net, &nft_base_chain(chain)->ops); |
d8ee8f7c PNA |
86 | } |
87 | ||
c974a3a3 PNA |
88 | static void nf_tables_unregister_hook(struct net *net, |
89 | const struct nft_table *table, | |
90 | struct nft_chain *chain) | |
c5598794 | 91 | { |
d8ee8f7c | 92 | if (table->flags & NFT_TABLE_F_DORMANT || |
f323d954 | 93 | !nft_is_base_chain(chain)) |
d8ee8f7c PNA |
94 | return; |
95 | ||
c974a3a3 | 96 | nf_unregister_net_hook(net, &nft_base_chain(chain)->ops); |
c5598794 AB |
97 | } |
98 | ||
ee01d542 AB |
99 | static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) |
100 | { | |
101 | struct nft_trans *trans; | |
102 | ||
103 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); | |
104 | if (trans == NULL) | |
105 | return -ENOMEM; | |
106 | ||
107 | if (msg_type == NFT_MSG_NEWTABLE) | |
f2a6d766 | 108 | nft_activate_next(ctx->net, ctx->table); |
ee01d542 AB |
109 | |
110 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static int nft_deltable(struct nft_ctx *ctx) | |
115 | { | |
116 | int err; | |
117 | ||
118 | err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); | |
119 | if (err < 0) | |
120 | return err; | |
121 | ||
f2a6d766 | 122 | nft_deactivate_next(ctx->net, ctx->table); |
ee01d542 AB |
123 | return err; |
124 | } | |
125 | ||
126 | static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) | |
127 | { | |
128 | struct nft_trans *trans; | |
129 | ||
130 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); | |
131 | if (trans == NULL) | |
132 | return -ENOMEM; | |
133 | ||
134 | if (msg_type == NFT_MSG_NEWCHAIN) | |
664b0f8c | 135 | nft_activate_next(ctx->net, ctx->chain); |
ee01d542 AB |
136 | |
137 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | static int nft_delchain(struct nft_ctx *ctx) | |
142 | { | |
143 | int err; | |
144 | ||
145 | err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); | |
146 | if (err < 0) | |
147 | return err; | |
148 | ||
149 | ctx->table->use--; | |
664b0f8c | 150 | nft_deactivate_next(ctx->net, ctx->chain); |
ee01d542 AB |
151 | |
152 | return err; | |
153 | } | |
154 | ||
ee01d542 AB |
155 | static int |
156 | nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) | |
157 | { | |
158 | /* You cannot delete the same rule twice */ | |
889f7ee7 PNA |
159 | if (nft_is_active_next(ctx->net, rule)) { |
160 | nft_deactivate_next(ctx->net, rule); | |
ee01d542 AB |
161 | ctx->chain->use--; |
162 | return 0; | |
163 | } | |
164 | return -ENOENT; | |
165 | } | |
166 | ||
167 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, | |
168 | struct nft_rule *rule) | |
169 | { | |
170 | struct nft_trans *trans; | |
171 | ||
172 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); | |
173 | if (trans == NULL) | |
174 | return NULL; | |
175 | ||
1a94e38d PNA |
176 | if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) { |
177 | nft_trans_rule_id(trans) = | |
178 | ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID])); | |
179 | } | |
ee01d542 AB |
180 | nft_trans_rule(trans) = rule; |
181 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
182 | ||
183 | return trans; | |
184 | } | |
185 | ||
186 | static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) | |
187 | { | |
188 | struct nft_trans *trans; | |
189 | int err; | |
190 | ||
191 | trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); | |
192 | if (trans == NULL) | |
193 | return -ENOMEM; | |
194 | ||
195 | err = nf_tables_delrule_deactivate(ctx, rule); | |
196 | if (err < 0) { | |
197 | nft_trans_destroy(trans); | |
198 | return err; | |
199 | } | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static int nft_delrule_by_chain(struct nft_ctx *ctx) | |
205 | { | |
206 | struct nft_rule *rule; | |
207 | int err; | |
208 | ||
209 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
210 | err = nft_delrule(ctx, rule); | |
211 | if (err < 0) | |
212 | return err; | |
213 | } | |
214 | return 0; | |
215 | } | |
216 | ||
ee01d542 AB |
217 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, |
218 | struct nft_set *set) | |
219 | { | |
220 | struct nft_trans *trans; | |
221 | ||
222 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); | |
223 | if (trans == NULL) | |
224 | return -ENOMEM; | |
225 | ||
226 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { | |
227 | nft_trans_set_id(trans) = | |
228 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); | |
37a9cc52 | 229 | nft_activate_next(ctx->net, set); |
ee01d542 AB |
230 | } |
231 | nft_trans_set(trans) = set; | |
232 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static int nft_delset(struct nft_ctx *ctx, struct nft_set *set) | |
238 | { | |
239 | int err; | |
240 | ||
241 | err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); | |
242 | if (err < 0) | |
243 | return err; | |
244 | ||
37a9cc52 | 245 | nft_deactivate_next(ctx->net, set); |
ee01d542 AB |
246 | ctx->table->use--; |
247 | ||
248 | return err; | |
249 | } | |
250 | ||
e5009240 PNA |
251 | static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type, |
252 | struct nft_object *obj) | |
253 | { | |
254 | struct nft_trans *trans; | |
255 | ||
256 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj)); | |
257 | if (trans == NULL) | |
258 | return -ENOMEM; | |
259 | ||
260 | if (msg_type == NFT_MSG_NEWOBJ) | |
261 | nft_activate_next(ctx->net, obj); | |
262 | ||
263 | nft_trans_obj(trans) = obj; | |
264 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj) | |
270 | { | |
271 | int err; | |
272 | ||
273 | err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj); | |
274 | if (err < 0) | |
275 | return err; | |
276 | ||
277 | nft_deactivate_next(ctx->net, obj); | |
278 | ctx->table->use--; | |
279 | ||
280 | return err; | |
281 | } | |
282 | ||
3b49e2e9 PNA |
283 | static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type, |
284 | struct nft_flowtable *flowtable) | |
285 | { | |
286 | struct nft_trans *trans; | |
287 | ||
288 | trans = nft_trans_alloc(ctx, msg_type, | |
289 | sizeof(struct nft_trans_flowtable)); | |
290 | if (trans == NULL) | |
291 | return -ENOMEM; | |
292 | ||
293 | if (msg_type == NFT_MSG_NEWFLOWTABLE) | |
294 | nft_activate_next(ctx->net, flowtable); | |
295 | ||
296 | nft_trans_flowtable(trans) = flowtable; | |
297 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | static int nft_delflowtable(struct nft_ctx *ctx, | |
303 | struct nft_flowtable *flowtable) | |
304 | { | |
305 | int err; | |
306 | ||
307 | err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable); | |
308 | if (err < 0) | |
309 | return err; | |
310 | ||
311 | nft_deactivate_next(ctx->net, flowtable); | |
312 | ctx->table->use--; | |
313 | ||
314 | return err; | |
315 | } | |
316 | ||
96518518 PM |
317 | /* |
318 | * Tables | |
319 | */ | |
320 | ||
36596dad | 321 | static struct nft_table *nft_table_lookup(const struct net *net, |
f2a6d766 | 322 | const struct nlattr *nla, |
36596dad | 323 | u8 family, u8 genmask) |
96518518 PM |
324 | { |
325 | struct nft_table *table; | |
326 | ||
36596dad | 327 | list_for_each_entry(table, &net->nft.tables, list) { |
f2a6d766 | 328 | if (!nla_strcmp(nla, table->name) && |
98319cb9 | 329 | table->family == family && |
f2a6d766 | 330 | nft_active_genmask(table, genmask)) |
96518518 PM |
331 | return table; |
332 | } | |
333 | return NULL; | |
334 | } | |
335 | ||
3ecbfd65 HS |
336 | static struct nft_table *nft_table_lookup_byhandle(const struct net *net, |
337 | const struct nlattr *nla, | |
338 | u8 genmask) | |
339 | { | |
340 | struct nft_table *table; | |
341 | ||
342 | list_for_each_entry(table, &net->nft.tables, list) { | |
343 | if (be64_to_cpu(nla_get_be64(nla)) == table->handle && | |
344 | nft_active_genmask(table, genmask)) | |
345 | return table; | |
346 | } | |
347 | return NULL; | |
348 | } | |
349 | ||
36596dad | 350 | static struct nft_table *nf_tables_table_lookup(const struct net *net, |
f2a6d766 | 351 | const struct nlattr *nla, |
36596dad | 352 | u8 family, u8 genmask) |
96518518 PM |
353 | { |
354 | struct nft_table *table; | |
355 | ||
356 | if (nla == NULL) | |
357 | return ERR_PTR(-EINVAL); | |
358 | ||
36596dad | 359 | table = nft_table_lookup(net, nla, family, genmask); |
96518518 PM |
360 | if (table != NULL) |
361 | return table; | |
362 | ||
96518518 PM |
363 | return ERR_PTR(-ENOENT); |
364 | } | |
365 | ||
3ecbfd65 HS |
366 | static struct nft_table *nf_tables_table_lookup_byhandle(const struct net *net, |
367 | const struct nlattr *nla, | |
368 | u8 genmask) | |
369 | { | |
370 | struct nft_table *table; | |
371 | ||
372 | if (nla == NULL) | |
373 | return ERR_PTR(-EINVAL); | |
374 | ||
375 | table = nft_table_lookup_byhandle(net, nla, genmask); | |
376 | if (table != NULL) | |
377 | return table; | |
378 | ||
379 | return ERR_PTR(-ENOENT); | |
380 | } | |
381 | ||
96518518 PM |
382 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) |
383 | { | |
384 | return ++table->hgenerator; | |
385 | } | |
386 | ||
d8297d4f | 387 | static const struct nf_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX]; |
9370761c | 388 | |
2a37d755 | 389 | static const struct nf_chain_type * |
1ea26cca | 390 | __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family) |
9370761c PNA |
391 | { |
392 | int i; | |
393 | ||
baae3e62 | 394 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
395 | if (chain_type[family][i] != NULL && |
396 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 397 | return chain_type[family][i]; |
9370761c | 398 | } |
baae3e62 | 399 | return NULL; |
9370761c PNA |
400 | } |
401 | ||
2a37d755 | 402 | static const struct nf_chain_type * |
1ea26cca | 403 | nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family, bool autoload) |
9370761c | 404 | { |
2a37d755 | 405 | const struct nf_chain_type *type; |
9370761c | 406 | |
1ea26cca | 407 | type = __nf_tables_chain_type_lookup(nla, family); |
93b0806f PM |
408 | if (type != NULL) |
409 | return type; | |
9370761c | 410 | #ifdef CONFIG_MODULES |
93b0806f | 411 | if (autoload) { |
9370761c | 412 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1ea26cca | 413 | request_module("nft-chain-%u-%.*s", family, |
2fec6bb6 | 414 | nla_len(nla), (const char *)nla_data(nla)); |
9370761c | 415 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
1ea26cca | 416 | type = __nf_tables_chain_type_lookup(nla, family); |
93b0806f PM |
417 | if (type != NULL) |
418 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
419 | } |
420 | #endif | |
93b0806f | 421 | return ERR_PTR(-ENOENT); |
9370761c PNA |
422 | } |
423 | ||
96518518 | 424 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
1cae565e PNA |
425 | [NFTA_TABLE_NAME] = { .type = NLA_STRING, |
426 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
9ddf6323 | 427 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
3ecbfd65 | 428 | [NFTA_TABLE_HANDLE] = { .type = NLA_U64 }, |
96518518 PM |
429 | }; |
430 | ||
84d7fce6 PNA |
431 | static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, |
432 | u32 portid, u32 seq, int event, u32 flags, | |
433 | int family, const struct nft_table *table) | |
96518518 PM |
434 | { |
435 | struct nlmsghdr *nlh; | |
436 | struct nfgenmsg *nfmsg; | |
437 | ||
dedb67c4 | 438 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
439 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
440 | if (nlh == NULL) | |
441 | goto nla_put_failure; | |
442 | ||
443 | nfmsg = nlmsg_data(nlh); | |
444 | nfmsg->nfgen_family = family; | |
445 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 446 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 | 447 | |
9ddf6323 | 448 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 | 449 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
3ecbfd65 HS |
450 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) || |
451 | nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle), | |
452 | NFTA_TABLE_PAD)) | |
96518518 PM |
453 | goto nla_put_failure; |
454 | ||
053c095a JB |
455 | nlmsg_end(skb, nlh); |
456 | return 0; | |
96518518 PM |
457 | |
458 | nla_put_failure: | |
459 | nlmsg_trim(skb, nlh); | |
460 | return -1; | |
461 | } | |
462 | ||
25e94a99 | 463 | static void nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
464 | { |
465 | struct sk_buff *skb; | |
96518518 PM |
466 | int err; |
467 | ||
128ad332 PNA |
468 | if (!ctx->report && |
469 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 470 | return; |
96518518 | 471 | |
96518518 PM |
472 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
473 | if (skb == NULL) | |
474 | goto err; | |
475 | ||
84d7fce6 | 476 | err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 477 | event, 0, ctx->family, ctx->table); |
96518518 PM |
478 | if (err < 0) { |
479 | kfree_skb(skb); | |
480 | goto err; | |
481 | } | |
482 | ||
25e94a99 PNA |
483 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
484 | ctx->report, GFP_KERNEL); | |
485 | return; | |
96518518 | 486 | err: |
25e94a99 | 487 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
488 | } |
489 | ||
490 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
491 | struct netlink_callback *cb) | |
492 | { | |
493 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
96518518 PM |
494 | const struct nft_table *table; |
495 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 496 | struct net *net = sock_net(skb->sk); |
96518518 PM |
497 | int family = nfmsg->nfgen_family; |
498 | ||
e688a7f8 | 499 | rcu_read_lock(); |
38e029f1 PNA |
500 | cb->seq = net->nft.base_seq; |
501 | ||
36596dad | 502 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 503 | if (family != NFPROTO_UNSPEC && family != table->family) |
96518518 PM |
504 | continue; |
505 | ||
36596dad PNA |
506 | if (idx < s_idx) |
507 | goto cont; | |
508 | if (idx > s_idx) | |
509 | memset(&cb->args[1], 0, | |
510 | sizeof(cb->args) - sizeof(cb->args[0])); | |
511 | if (!nft_is_active(net, table)) | |
512 | continue; | |
513 | if (nf_tables_fill_table_info(skb, net, | |
514 | NETLINK_CB(cb->skb).portid, | |
515 | cb->nlh->nlmsg_seq, | |
516 | NFT_MSG_NEWTABLE, NLM_F_MULTI, | |
98319cb9 | 517 | table->family, table) < 0) |
36596dad PNA |
518 | goto done; |
519 | ||
520 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 | 521 | cont: |
36596dad | 522 | idx++; |
96518518 PM |
523 | } |
524 | done: | |
e688a7f8 | 525 | rcu_read_unlock(); |
96518518 PM |
526 | cb->args[0] = idx; |
527 | return skb->len; | |
528 | } | |
529 | ||
7b8002a1 PNA |
530 | static int nf_tables_gettable(struct net *net, struct sock *nlsk, |
531 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
532 | const struct nlattr * const nla[], |
533 | struct netlink_ext_ack *extack) | |
96518518 PM |
534 | { |
535 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 536 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
537 | const struct nft_table *table; |
538 | struct sk_buff *skb2; | |
539 | int family = nfmsg->nfgen_family; | |
540 | int err; | |
541 | ||
542 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
543 | struct netlink_dump_control c = { | |
544 | .dump = nf_tables_dump_tables, | |
545 | }; | |
546 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
547 | } | |
548 | ||
98319cb9 | 549 | table = nf_tables_table_lookup(net, nla[NFTA_TABLE_NAME], family, |
36596dad | 550 | genmask); |
96518518 PM |
551 | if (IS_ERR(table)) |
552 | return PTR_ERR(table); | |
553 | ||
554 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
555 | if (!skb2) | |
556 | return -ENOMEM; | |
557 | ||
84d7fce6 | 558 | err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
559 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, |
560 | family, table); | |
561 | if (err < 0) | |
562 | goto err; | |
563 | ||
564 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
565 | ||
566 | err: | |
567 | kfree_skb(skb2); | |
568 | return err; | |
569 | } | |
570 | ||
c9c17211 | 571 | static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt) |
10435c11 F |
572 | { |
573 | struct nft_chain *chain; | |
574 | u32 i = 0; | |
575 | ||
576 | list_for_each_entry(chain, &table->chains, list) { | |
577 | if (!nft_is_active_next(net, chain)) | |
578 | continue; | |
f323d954 | 579 | if (!nft_is_base_chain(chain)) |
10435c11 F |
580 | continue; |
581 | ||
582 | if (cnt && i++ == cnt) | |
583 | break; | |
584 | ||
c974a3a3 | 585 | nf_unregister_net_hook(net, &nft_base_chain(chain)->ops); |
10435c11 F |
586 | } |
587 | } | |
588 | ||
c9c17211 | 589 | static int nf_tables_table_enable(struct net *net, struct nft_table *table) |
9ddf6323 PNA |
590 | { |
591 | struct nft_chain *chain; | |
592 | int err, i = 0; | |
593 | ||
594 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
595 | if (!nft_is_active_next(net, chain)) |
596 | continue; | |
f323d954 | 597 | if (!nft_is_base_chain(chain)) |
d2012975 PNA |
598 | continue; |
599 | ||
c974a3a3 | 600 | err = nf_register_net_hook(net, &nft_base_chain(chain)->ops); |
9ddf6323 PNA |
601 | if (err < 0) |
602 | goto err; | |
603 | ||
604 | i++; | |
605 | } | |
606 | return 0; | |
607 | err: | |
10435c11 | 608 | if (i) |
c9c17211 | 609 | nft_table_disable(net, table, i); |
9ddf6323 PNA |
610 | return err; |
611 | } | |
612 | ||
c9c17211 | 613 | static void nf_tables_table_disable(struct net *net, struct nft_table *table) |
9ddf6323 | 614 | { |
c9c17211 | 615 | nft_table_disable(net, table, 0); |
9ddf6323 PNA |
616 | } |
617 | ||
e1aaca93 | 618 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 619 | { |
55dd6f93 | 620 | struct nft_trans *trans; |
e1aaca93 | 621 | u32 flags; |
55dd6f93 | 622 | int ret = 0; |
9ddf6323 | 623 | |
e1aaca93 PNA |
624 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
625 | return 0; | |
9ddf6323 | 626 | |
e1aaca93 PNA |
627 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
628 | if (flags & ~NFT_TABLE_F_DORMANT) | |
629 | return -EINVAL; | |
630 | ||
63283dd2 PNA |
631 | if (flags == ctx->table->flags) |
632 | return 0; | |
633 | ||
55dd6f93 PNA |
634 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
635 | sizeof(struct nft_trans_table)); | |
636 | if (trans == NULL) | |
637 | return -ENOMEM; | |
9ddf6323 | 638 | |
e1aaca93 PNA |
639 | if ((flags & NFT_TABLE_F_DORMANT) && |
640 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 641 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
642 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
643 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
c9c17211 | 644 | ret = nf_tables_table_enable(ctx->net, ctx->table); |
55dd6f93 | 645 | if (ret >= 0) { |
e1aaca93 | 646 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 647 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 648 | } |
9ddf6323 | 649 | } |
e1aaca93 PNA |
650 | if (ret < 0) |
651 | goto err; | |
9ddf6323 | 652 | |
55dd6f93 PNA |
653 | nft_trans_table_update(trans) = true; |
654 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
655 | return 0; | |
9ddf6323 | 656 | err: |
55dd6f93 | 657 | nft_trans_destroy(trans); |
9ddf6323 PNA |
658 | return ret; |
659 | } | |
660 | ||
633c9a84 PNA |
661 | static int nf_tables_newtable(struct net *net, struct sock *nlsk, |
662 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
663 | const struct nlattr * const nla[], |
664 | struct netlink_ext_ack *extack) | |
96518518 PM |
665 | { |
666 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 667 | u8 genmask = nft_genmask_next(net); |
96518518 | 668 | const struct nlattr *name; |
96518518 PM |
669 | struct nft_table *table; |
670 | int family = nfmsg->nfgen_family; | |
c5c1f975 | 671 | u32 flags = 0; |
e1aaca93 | 672 | struct nft_ctx ctx; |
55dd6f93 | 673 | int err; |
96518518 | 674 | |
96518518 | 675 | name = nla[NFTA_TABLE_NAME]; |
98319cb9 | 676 | table = nf_tables_table_lookup(net, name, family, genmask); |
96518518 PM |
677 | if (IS_ERR(table)) { |
678 | if (PTR_ERR(table) != -ENOENT) | |
679 | return PTR_ERR(table); | |
1a28ad74 | 680 | } else { |
96518518 PM |
681 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
682 | return -EEXIST; | |
683 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
684 | return -EOPNOTSUPP; | |
e1aaca93 | 685 | |
98319cb9 | 686 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e1aaca93 | 687 | return nf_tables_updtable(&ctx); |
96518518 PM |
688 | } |
689 | ||
c5c1f975 PM |
690 | if (nla[NFTA_TABLE_FLAGS]) { |
691 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
692 | if (flags & ~NFT_TABLE_F_DORMANT) | |
693 | return -EINVAL; | |
694 | } | |
695 | ||
ffdb210e | 696 | err = -ENOMEM; |
1cae565e | 697 | table = kzalloc(sizeof(*table), GFP_KERNEL); |
ffdb210e | 698 | if (table == NULL) |
98319cb9 | 699 | goto err_kzalloc; |
96518518 | 700 | |
e46abbcc PS |
701 | table->name = nla_strdup(name, GFP_KERNEL); |
702 | if (table->name == NULL) | |
98319cb9 | 703 | goto err_strdup; |
e46abbcc | 704 | |
96518518 | 705 | INIT_LIST_HEAD(&table->chains); |
20a69341 | 706 | INIT_LIST_HEAD(&table->sets); |
e5009240 | 707 | INIT_LIST_HEAD(&table->objects); |
3b49e2e9 | 708 | INIT_LIST_HEAD(&table->flowtables); |
98319cb9 | 709 | table->family = family; |
c5c1f975 | 710 | table->flags = flags; |
3ecbfd65 | 711 | table->handle = ++table_handle; |
9ddf6323 | 712 | |
98319cb9 | 713 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
55dd6f93 | 714 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); |
ffdb210e | 715 | if (err < 0) |
98319cb9 | 716 | goto err_trans; |
ffdb210e | 717 | |
36596dad | 718 | list_add_tail_rcu(&table->list, &net->nft.tables); |
96518518 | 719 | return 0; |
98319cb9 | 720 | err_trans: |
e46abbcc | 721 | kfree(table->name); |
98319cb9 | 722 | err_strdup: |
ffdb210e | 723 | kfree(table); |
98319cb9 | 724 | err_kzalloc: |
ffdb210e | 725 | return err; |
96518518 PM |
726 | } |
727 | ||
b9ac12ef AB |
728 | static int nft_flush_table(struct nft_ctx *ctx) |
729 | { | |
3b49e2e9 | 730 | struct nft_flowtable *flowtable, *nft; |
b9ac12ef | 731 | struct nft_chain *chain, *nc; |
e5009240 | 732 | struct nft_object *obj, *ne; |
b9ac12ef | 733 | struct nft_set *set, *ns; |
3b49e2e9 | 734 | int err; |
b9ac12ef | 735 | |
a2f18db0 | 736 | list_for_each_entry(chain, &ctx->table->chains, list) { |
664b0f8c PNA |
737 | if (!nft_is_active_next(ctx->net, chain)) |
738 | continue; | |
739 | ||
b9ac12ef AB |
740 | ctx->chain = chain; |
741 | ||
742 | err = nft_delrule_by_chain(ctx); | |
743 | if (err < 0) | |
744 | goto out; | |
b9ac12ef AB |
745 | } |
746 | ||
747 | list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { | |
37a9cc52 PNA |
748 | if (!nft_is_active_next(ctx->net, set)) |
749 | continue; | |
750 | ||
408070d6 | 751 | if (nft_set_is_anonymous(set) && |
b9ac12ef AB |
752 | !list_empty(&set->bindings)) |
753 | continue; | |
754 | ||
755 | err = nft_delset(ctx, set); | |
756 | if (err < 0) | |
757 | goto out; | |
758 | } | |
759 | ||
3b49e2e9 PNA |
760 | list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) { |
761 | err = nft_delflowtable(ctx, flowtable); | |
762 | if (err < 0) | |
763 | goto out; | |
764 | } | |
765 | ||
e5009240 PNA |
766 | list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { |
767 | err = nft_delobj(ctx, obj); | |
768 | if (err < 0) | |
769 | goto out; | |
770 | } | |
771 | ||
a2f18db0 | 772 | list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { |
664b0f8c PNA |
773 | if (!nft_is_active_next(ctx->net, chain)) |
774 | continue; | |
775 | ||
a2f18db0 PNA |
776 | ctx->chain = chain; |
777 | ||
778 | err = nft_delchain(ctx); | |
779 | if (err < 0) | |
780 | goto out; | |
781 | } | |
782 | ||
b9ac12ef AB |
783 | err = nft_deltable(ctx); |
784 | out: | |
785 | return err; | |
786 | } | |
787 | ||
788 | static int nft_flush(struct nft_ctx *ctx, int family) | |
789 | { | |
b9ac12ef AB |
790 | struct nft_table *table, *nt; |
791 | const struct nlattr * const *nla = ctx->nla; | |
792 | int err = 0; | |
793 | ||
36596dad | 794 | list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) { |
98319cb9 | 795 | if (family != AF_UNSPEC && table->family != family) |
b9ac12ef AB |
796 | continue; |
797 | ||
98319cb9 | 798 | ctx->family = table->family; |
f2a6d766 | 799 | |
36596dad PNA |
800 | if (!nft_is_active_next(ctx->net, table)) |
801 | continue; | |
b9ac12ef | 802 | |
36596dad PNA |
803 | if (nla[NFTA_TABLE_NAME] && |
804 | nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) | |
805 | continue; | |
b9ac12ef | 806 | |
36596dad PNA |
807 | ctx->table = table; |
808 | ||
809 | err = nft_flush_table(ctx); | |
810 | if (err < 0) | |
811 | goto out; | |
b9ac12ef AB |
812 | } |
813 | out: | |
814 | return err; | |
815 | } | |
816 | ||
633c9a84 PNA |
817 | static int nf_tables_deltable(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 | struct nft_table *table; |
ee01d542 | 825 | int family = nfmsg->nfgen_family; |
55dd6f93 | 826 | struct nft_ctx ctx; |
96518518 | 827 | |
36596dad | 828 | nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla); |
3ecbfd65 HS |
829 | if (family == AF_UNSPEC || |
830 | (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE])) | |
b9ac12ef AB |
831 | return nft_flush(&ctx, family); |
832 | ||
3ecbfd65 HS |
833 | if (nla[NFTA_TABLE_HANDLE]) |
834 | table = nf_tables_table_lookup_byhandle(net, | |
835 | nla[NFTA_TABLE_HANDLE], | |
836 | genmask); | |
837 | else | |
838 | table = nf_tables_table_lookup(net, nla[NFTA_TABLE_NAME], | |
839 | family, genmask); | |
840 | ||
96518518 PM |
841 | if (IS_ERR(table)) |
842 | return PTR_ERR(table); | |
96518518 | 843 | |
a8278400 PNA |
844 | if (nlh->nlmsg_flags & NLM_F_NONREC && |
845 | table->use > 0) | |
846 | return -EBUSY; | |
847 | ||
98319cb9 | 848 | ctx.family = family; |
b9ac12ef | 849 | ctx.table = table; |
55dd6f93 | 850 | |
b9ac12ef | 851 | return nft_flush_table(&ctx); |
96518518 PM |
852 | } |
853 | ||
55dd6f93 PNA |
854 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
855 | { | |
4fefee57 PNA |
856 | BUG_ON(ctx->table->use > 0); |
857 | ||
e46abbcc | 858 | kfree(ctx->table->name); |
55dd6f93 | 859 | kfree(ctx->table); |
55dd6f93 PNA |
860 | } |
861 | ||
2a37d755 | 862 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 863 | { |
9370761c | 864 | int err = 0; |
96518518 | 865 | |
d8297d4f FW |
866 | if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO)) |
867 | return -EINVAL; | |
868 | ||
96518518 | 869 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c PNA |
870 | if (chain_type[ctype->family][ctype->type] != NULL) { |
871 | err = -EBUSY; | |
872 | goto out; | |
96518518 | 873 | } |
9370761c PNA |
874 | chain_type[ctype->family][ctype->type] = ctype; |
875 | out: | |
96518518 PM |
876 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
877 | return err; | |
878 | } | |
9370761c | 879 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 880 | |
2a37d755 | 881 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 882 | { |
96518518 | 883 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 884 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
885 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
886 | } | |
9370761c | 887 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
888 | |
889 | /* | |
890 | * Chains | |
891 | */ | |
892 | ||
893 | static struct nft_chain * | |
664b0f8c PNA |
894 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle, |
895 | u8 genmask) | |
96518518 PM |
896 | { |
897 | struct nft_chain *chain; | |
898 | ||
899 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
900 | if (chain->handle == handle && |
901 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
902 | return chain; |
903 | } | |
904 | ||
905 | return ERR_PTR(-ENOENT); | |
906 | } | |
907 | ||
908 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
664b0f8c PNA |
909 | const struct nlattr *nla, |
910 | u8 genmask) | |
96518518 PM |
911 | { |
912 | struct nft_chain *chain; | |
913 | ||
914 | if (nla == NULL) | |
915 | return ERR_PTR(-EINVAL); | |
916 | ||
917 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
918 | if (!nla_strcmp(nla, chain->name) && |
919 | nft_active_genmask(chain, genmask)) | |
96518518 PM |
920 | return chain; |
921 | } | |
922 | ||
923 | return ERR_PTR(-ENOENT); | |
924 | } | |
925 | ||
926 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
b2fbd044 LZ |
927 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, |
928 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
929 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, |
930 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
931 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
932 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 933 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 934 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 935 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
936 | }; |
937 | ||
938 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
939 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
940 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
2cbce139 PNA |
941 | [NFTA_HOOK_DEV] = { .type = NLA_STRING, |
942 | .len = IFNAMSIZ - 1 }, | |
96518518 PM |
943 | }; |
944 | ||
0ca743a5 PNA |
945 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
946 | { | |
947 | struct nft_stats *cpu_stats, total; | |
948 | struct nlattr *nest; | |
ce355e20 ED |
949 | unsigned int seq; |
950 | u64 pkts, bytes; | |
0ca743a5 PNA |
951 | int cpu; |
952 | ||
953 | memset(&total, 0, sizeof(total)); | |
954 | for_each_possible_cpu(cpu) { | |
955 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
956 | do { |
957 | seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
958 | pkts = cpu_stats->pkts; | |
959 | bytes = cpu_stats->bytes; | |
960 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); | |
961 | total.pkts += pkts; | |
962 | total.bytes += bytes; | |
0ca743a5 PNA |
963 | } |
964 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
965 | if (nest == NULL) | |
966 | goto nla_put_failure; | |
967 | ||
b46f6ded ND |
968 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), |
969 | NFTA_COUNTER_PAD) || | |
970 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), | |
971 | NFTA_COUNTER_PAD)) | |
0ca743a5 PNA |
972 | goto nla_put_failure; |
973 | ||
974 | nla_nest_end(skb, nest); | |
975 | return 0; | |
976 | ||
977 | nla_put_failure: | |
978 | return -ENOSPC; | |
979 | } | |
980 | ||
84d7fce6 PNA |
981 | static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, |
982 | u32 portid, u32 seq, int event, u32 flags, | |
983 | int family, const struct nft_table *table, | |
96518518 PM |
984 | const struct nft_chain *chain) |
985 | { | |
986 | struct nlmsghdr *nlh; | |
987 | struct nfgenmsg *nfmsg; | |
988 | ||
dedb67c4 | 989 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 PM |
990 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
991 | if (nlh == NULL) | |
992 | goto nla_put_failure; | |
993 | ||
994 | nfmsg = nlmsg_data(nlh); | |
995 | nfmsg->nfgen_family = family; | |
996 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 997 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
998 | |
999 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
1000 | goto nla_put_failure; | |
b46f6ded ND |
1001 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), |
1002 | NFTA_CHAIN_PAD)) | |
96518518 PM |
1003 | goto nla_put_failure; |
1004 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
1005 | goto nla_put_failure; | |
1006 | ||
f323d954 | 1007 | if (nft_is_base_chain(chain)) { |
0ca743a5 | 1008 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
c974a3a3 | 1009 | const struct nf_hook_ops *ops = &basechain->ops; |
0ca743a5 PNA |
1010 | struct nlattr *nest; |
1011 | ||
1012 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
1013 | if (nest == NULL) |
1014 | goto nla_put_failure; | |
1015 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
1016 | goto nla_put_failure; | |
1017 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
1018 | goto nla_put_failure; | |
2cbce139 PNA |
1019 | if (basechain->dev_name[0] && |
1020 | nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name)) | |
1021 | goto nla_put_failure; | |
96518518 | 1022 | nla_nest_end(skb, nest); |
9370761c | 1023 | |
0ca743a5 PNA |
1024 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
1025 | htonl(basechain->policy))) | |
1026 | goto nla_put_failure; | |
1027 | ||
baae3e62 PM |
1028 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
1029 | goto nla_put_failure; | |
0ca743a5 | 1030 | |
5f9bfe0e | 1031 | if (basechain->stats && nft_dump_stats(skb, basechain->stats)) |
0ca743a5 | 1032 | goto nla_put_failure; |
96518518 PM |
1033 | } |
1034 | ||
0ca743a5 PNA |
1035 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
1036 | goto nla_put_failure; | |
1037 | ||
053c095a JB |
1038 | nlmsg_end(skb, nlh); |
1039 | return 0; | |
96518518 PM |
1040 | |
1041 | nla_put_failure: | |
1042 | nlmsg_trim(skb, nlh); | |
1043 | return -1; | |
1044 | } | |
1045 | ||
25e94a99 | 1046 | static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
1047 | { |
1048 | struct sk_buff *skb; | |
96518518 PM |
1049 | int err; |
1050 | ||
128ad332 PNA |
1051 | if (!ctx->report && |
1052 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 1053 | return; |
96518518 | 1054 | |
96518518 PM |
1055 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1056 | if (skb == NULL) | |
1057 | goto err; | |
1058 | ||
84d7fce6 | 1059 | err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 1060 | event, 0, ctx->family, ctx->table, |
35151d84 | 1061 | ctx->chain); |
96518518 PM |
1062 | if (err < 0) { |
1063 | kfree_skb(skb); | |
1064 | goto err; | |
1065 | } | |
1066 | ||
25e94a99 PNA |
1067 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1068 | ctx->report, GFP_KERNEL); | |
1069 | return; | |
96518518 | 1070 | err: |
25e94a99 | 1071 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
1072 | } |
1073 | ||
1074 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
1075 | struct netlink_callback *cb) | |
1076 | { | |
1077 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
96518518 PM |
1078 | const struct nft_table *table; |
1079 | const struct nft_chain *chain; | |
1080 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1081 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1082 | int family = nfmsg->nfgen_family; |
1083 | ||
e688a7f8 | 1084 | rcu_read_lock(); |
38e029f1 PNA |
1085 | cb->seq = net->nft.base_seq; |
1086 | ||
36596dad | 1087 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 1088 | if (family != NFPROTO_UNSPEC && family != table->family) |
96518518 PM |
1089 | continue; |
1090 | ||
36596dad PNA |
1091 | list_for_each_entry_rcu(chain, &table->chains, list) { |
1092 | if (idx < s_idx) | |
1093 | goto cont; | |
1094 | if (idx > s_idx) | |
1095 | memset(&cb->args[1], 0, | |
1096 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1097 | if (!nft_is_active(net, chain)) | |
1098 | continue; | |
1099 | if (nf_tables_fill_chain_info(skb, net, | |
1100 | NETLINK_CB(cb->skb).portid, | |
1101 | cb->nlh->nlmsg_seq, | |
1102 | NFT_MSG_NEWCHAIN, | |
1103 | NLM_F_MULTI, | |
98319cb9 | 1104 | table->family, table, |
36596dad PNA |
1105 | chain) < 0) |
1106 | goto done; | |
38e029f1 | 1107 | |
36596dad | 1108 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
96518518 | 1109 | cont: |
36596dad | 1110 | idx++; |
96518518 PM |
1111 | } |
1112 | } | |
1113 | done: | |
e688a7f8 | 1114 | rcu_read_unlock(); |
96518518 PM |
1115 | cb->args[0] = idx; |
1116 | return skb->len; | |
1117 | } | |
1118 | ||
7b8002a1 PNA |
1119 | static int nf_tables_getchain(struct net *net, struct sock *nlsk, |
1120 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1121 | const struct nlattr * const nla[], |
1122 | struct netlink_ext_ack *extack) | |
96518518 PM |
1123 | { |
1124 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1125 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
1126 | const struct nft_table *table; |
1127 | const struct nft_chain *chain; | |
1128 | struct sk_buff *skb2; | |
1129 | int family = nfmsg->nfgen_family; | |
1130 | int err; | |
1131 | ||
1132 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1133 | struct netlink_dump_control c = { | |
1134 | .dump = nf_tables_dump_chains, | |
1135 | }; | |
1136 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1137 | } | |
1138 | ||
98319cb9 | 1139 | table = nf_tables_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, |
36596dad | 1140 | genmask); |
96518518 PM |
1141 | if (IS_ERR(table)) |
1142 | return PTR_ERR(table); | |
1143 | ||
664b0f8c | 1144 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); |
96518518 PM |
1145 | if (IS_ERR(chain)) |
1146 | return PTR_ERR(chain); | |
1147 | ||
1148 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1149 | if (!skb2) | |
1150 | return -ENOMEM; | |
1151 | ||
84d7fce6 | 1152 | err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
1153 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, |
1154 | family, table, chain); | |
1155 | if (err < 0) | |
1156 | goto err; | |
1157 | ||
1158 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1159 | ||
1160 | err: | |
1161 | kfree_skb(skb2); | |
1162 | return err; | |
1163 | } | |
1164 | ||
0ca743a5 PNA |
1165 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
1166 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
1167 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
1168 | }; | |
1169 | ||
ff3cd7b3 | 1170 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
1171 | { |
1172 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
1173 | struct nft_stats __percpu *newstats; | |
1174 | struct nft_stats *stats; | |
1175 | int err; | |
1176 | ||
fceb6435 JB |
1177 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy, |
1178 | NULL); | |
0ca743a5 | 1179 | if (err < 0) |
ff3cd7b3 | 1180 | return ERR_PTR(err); |
0ca743a5 PNA |
1181 | |
1182 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 1183 | return ERR_PTR(-EINVAL); |
0ca743a5 | 1184 | |
ce355e20 | 1185 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 1186 | if (newstats == NULL) |
ff3cd7b3 | 1187 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
1188 | |
1189 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
1190 | * are not exposed to userspace. | |
1191 | */ | |
e8781f70 | 1192 | preempt_disable(); |
0ca743a5 PNA |
1193 | stats = this_cpu_ptr(newstats); |
1194 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
1195 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
e8781f70 | 1196 | preempt_enable(); |
0ca743a5 | 1197 | |
ff3cd7b3 PNA |
1198 | return newstats; |
1199 | } | |
1200 | ||
1201 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
1202 | struct nft_stats __percpu *newstats) | |
1203 | { | |
0befd061 PNA |
1204 | struct nft_stats __percpu *oldstats; |
1205 | ||
b88825de PNA |
1206 | if (newstats == NULL) |
1207 | return; | |
1208 | ||
0ca743a5 | 1209 | if (chain->stats) { |
0befd061 | 1210 | oldstats = nfnl_dereference(chain->stats, NFNL_SUBSYS_NFTABLES); |
0ca743a5 PNA |
1211 | rcu_assign_pointer(chain->stats, newstats); |
1212 | synchronize_rcu(); | |
1213 | free_percpu(oldstats); | |
1214 | } else | |
1215 | rcu_assign_pointer(chain->stats, newstats); | |
0ca743a5 PNA |
1216 | } |
1217 | ||
91c7b38d PNA |
1218 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
1219 | { | |
1220 | BUG_ON(chain->use > 0); | |
1221 | ||
f323d954 | 1222 | if (nft_is_base_chain(chain)) { |
2cbce139 PNA |
1223 | struct nft_base_chain *basechain = nft_base_chain(chain); |
1224 | ||
1225 | module_put(basechain->type->owner); | |
1226 | free_percpu(basechain->stats); | |
9f08ea84 PNA |
1227 | if (basechain->stats) |
1228 | static_branch_dec(&nft_counters_enabled); | |
c974a3a3 PNA |
1229 | if (basechain->ops.dev != NULL) |
1230 | dev_put(basechain->ops.dev); | |
b7263e07 | 1231 | kfree(chain->name); |
2cbce139 | 1232 | kfree(basechain); |
91c7b38d | 1233 | } else { |
b7263e07 | 1234 | kfree(chain->name); |
91c7b38d PNA |
1235 | kfree(chain); |
1236 | } | |
1237 | } | |
1238 | ||
508f8ccd PNA |
1239 | struct nft_chain_hook { |
1240 | u32 num; | |
84ba7dd7 | 1241 | s32 priority; |
508f8ccd PNA |
1242 | const struct nf_chain_type *type; |
1243 | struct net_device *dev; | |
1244 | }; | |
1245 | ||
1246 | static int nft_chain_parse_hook(struct net *net, | |
1247 | const struct nlattr * const nla[], | |
36596dad PNA |
1248 | struct nft_chain_hook *hook, u8 family, |
1249 | bool create) | |
508f8ccd PNA |
1250 | { |
1251 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; | |
1252 | const struct nf_chain_type *type; | |
1253 | struct net_device *dev; | |
1254 | int err; | |
1255 | ||
1256 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
fceb6435 | 1257 | nft_hook_policy, NULL); |
508f8ccd PNA |
1258 | if (err < 0) |
1259 | return err; | |
1260 | ||
1261 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1262 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1263 | return -EINVAL; | |
1264 | ||
1265 | hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
508f8ccd PNA |
1266 | hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
1267 | ||
36596dad | 1268 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
508f8ccd | 1269 | if (nla[NFTA_CHAIN_TYPE]) { |
1ea26cca | 1270 | type = nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE], |
36596dad | 1271 | family, create); |
508f8ccd PNA |
1272 | if (IS_ERR(type)) |
1273 | return PTR_ERR(type); | |
1274 | } | |
1275 | if (!(type->hook_mask & (1 << hook->num))) | |
1276 | return -EOPNOTSUPP; | |
84ba7dd7 FW |
1277 | |
1278 | if (type->type == NFT_CHAIN_T_NAT && | |
1279 | hook->priority <= NF_IP_PRI_CONNTRACK) | |
1280 | return -EOPNOTSUPP; | |
1281 | ||
508f8ccd PNA |
1282 | if (!try_module_get(type->owner)) |
1283 | return -ENOENT; | |
1284 | ||
1285 | hook->type = type; | |
1286 | ||
1287 | hook->dev = NULL; | |
36596dad | 1288 | if (family == NFPROTO_NETDEV) { |
508f8ccd PNA |
1289 | char ifname[IFNAMSIZ]; |
1290 | ||
1291 | if (!ha[NFTA_HOOK_DEV]) { | |
1292 | module_put(type->owner); | |
1293 | return -EOPNOTSUPP; | |
1294 | } | |
1295 | ||
1296 | nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ); | |
1297 | dev = dev_get_by_name(net, ifname); | |
1298 | if (!dev) { | |
1299 | module_put(type->owner); | |
1300 | return -ENOENT; | |
1301 | } | |
1302 | hook->dev = dev; | |
1303 | } else if (ha[NFTA_HOOK_DEV]) { | |
1304 | module_put(type->owner); | |
1305 | return -EOPNOTSUPP; | |
1306 | } | |
1307 | ||
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | static void nft_chain_release_hook(struct nft_chain_hook *hook) | |
1312 | { | |
1313 | module_put(hook->type->owner); | |
1314 | if (hook->dev != NULL) | |
1315 | dev_put(hook->dev); | |
1316 | } | |
1317 | ||
4035285f PNA |
1318 | static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask, |
1319 | u8 policy, bool create) | |
1320 | { | |
1321 | const struct nlattr * const *nla = ctx->nla; | |
1322 | struct nft_table *table = ctx->table; | |
4035285f PNA |
1323 | struct nft_base_chain *basechain; |
1324 | struct nft_stats __percpu *stats; | |
1325 | struct net *net = ctx->net; | |
1326 | struct nft_chain *chain; | |
4035285f PNA |
1327 | int err; |
1328 | ||
1329 | if (table->use == UINT_MAX) | |
1330 | return -EOVERFLOW; | |
1331 | ||
1332 | if (nla[NFTA_CHAIN_HOOK]) { | |
1333 | struct nft_chain_hook hook; | |
1334 | struct nf_hook_ops *ops; | |
4035285f | 1335 | |
36596dad | 1336 | err = nft_chain_parse_hook(net, nla, &hook, family, create); |
4035285f PNA |
1337 | if (err < 0) |
1338 | return err; | |
1339 | ||
1340 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); | |
1341 | if (basechain == NULL) { | |
1342 | nft_chain_release_hook(&hook); | |
1343 | return -ENOMEM; | |
1344 | } | |
1345 | ||
1346 | if (hook.dev != NULL) | |
1347 | strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ); | |
1348 | ||
1349 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1350 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1351 | if (IS_ERR(stats)) { | |
1352 | nft_chain_release_hook(&hook); | |
1353 | kfree(basechain); | |
1354 | return PTR_ERR(stats); | |
1355 | } | |
1356 | basechain->stats = stats; | |
1357 | static_branch_inc(&nft_counters_enabled); | |
1358 | } | |
1359 | ||
4035285f PNA |
1360 | basechain->type = hook.type; |
1361 | chain = &basechain->chain; | |
1362 | ||
c974a3a3 PNA |
1363 | ops = &basechain->ops; |
1364 | ops->pf = family; | |
1365 | ops->hooknum = hook.num; | |
1366 | ops->priority = hook.priority; | |
1367 | ops->priv = chain; | |
c2f9eafe | 1368 | ops->hook = hook.type->hooks[ops->hooknum]; |
c974a3a3 | 1369 | ops->dev = hook.dev; |
c974a3a3 PNA |
1370 | |
1371 | if (basechain->type->type == NFT_CHAIN_T_NAT) | |
1372 | ops->nat_hook = true; | |
4035285f PNA |
1373 | |
1374 | chain->flags |= NFT_BASE_CHAIN; | |
1375 | basechain->policy = policy; | |
1376 | } else { | |
1377 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1378 | if (chain == NULL) | |
1379 | return -ENOMEM; | |
1380 | } | |
1381 | INIT_LIST_HEAD(&chain->rules); | |
1382 | chain->handle = nf_tables_alloc_handle(table); | |
1383 | chain->table = table; | |
1384 | chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL); | |
1385 | if (!chain->name) { | |
1386 | err = -ENOMEM; | |
1387 | goto err1; | |
1388 | } | |
1389 | ||
c974a3a3 | 1390 | err = nf_tables_register_hook(net, table, chain); |
4035285f PNA |
1391 | if (err < 0) |
1392 | goto err1; | |
1393 | ||
1394 | ctx->chain = chain; | |
1395 | err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN); | |
1396 | if (err < 0) | |
1397 | goto err2; | |
1398 | ||
1399 | table->use++; | |
1400 | list_add_tail_rcu(&chain->list, &table->chains); | |
1401 | ||
1402 | return 0; | |
1403 | err2: | |
c974a3a3 | 1404 | nf_tables_unregister_hook(net, table, chain); |
4035285f PNA |
1405 | err1: |
1406 | nf_tables_chain_destroy(chain); | |
1407 | ||
1408 | return err; | |
1409 | } | |
1410 | ||
2c4a488a PNA |
1411 | static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy, |
1412 | bool create) | |
1413 | { | |
1414 | const struct nlattr * const *nla = ctx->nla; | |
1415 | struct nft_table *table = ctx->table; | |
1416 | struct nft_chain *chain = ctx->chain; | |
2c4a488a PNA |
1417 | struct nft_base_chain *basechain; |
1418 | struct nft_stats *stats = NULL; | |
1419 | struct nft_chain_hook hook; | |
1420 | const struct nlattr *name; | |
1421 | struct nf_hook_ops *ops; | |
1422 | struct nft_trans *trans; | |
c974a3a3 | 1423 | int err; |
2c4a488a PNA |
1424 | |
1425 | if (nla[NFTA_CHAIN_HOOK]) { | |
1426 | if (!nft_is_base_chain(chain)) | |
1427 | return -EBUSY; | |
1428 | ||
36596dad | 1429 | err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family, |
2c4a488a PNA |
1430 | create); |
1431 | if (err < 0) | |
1432 | return err; | |
1433 | ||
1434 | basechain = nft_base_chain(chain); | |
1435 | if (basechain->type != hook.type) { | |
1436 | nft_chain_release_hook(&hook); | |
1437 | return -EBUSY; | |
1438 | } | |
1439 | ||
c974a3a3 PNA |
1440 | ops = &basechain->ops; |
1441 | if (ops->hooknum != hook.num || | |
1442 | ops->priority != hook.priority || | |
1443 | ops->dev != hook.dev) { | |
1444 | nft_chain_release_hook(&hook); | |
1445 | return -EBUSY; | |
2c4a488a PNA |
1446 | } |
1447 | nft_chain_release_hook(&hook); | |
1448 | } | |
1449 | ||
1450 | if (nla[NFTA_CHAIN_HANDLE] && | |
1451 | nla[NFTA_CHAIN_NAME]) { | |
1452 | struct nft_chain *chain2; | |
1453 | ||
1454 | chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], | |
1455 | genmask); | |
0d18779b JC |
1456 | if (!IS_ERR(chain2)) |
1457 | return -EEXIST; | |
2c4a488a PNA |
1458 | } |
1459 | ||
1460 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
1461 | if (!nft_is_base_chain(chain)) | |
1462 | return -EOPNOTSUPP; | |
1463 | ||
1464 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); | |
1465 | if (IS_ERR(stats)) | |
1466 | return PTR_ERR(stats); | |
1467 | } | |
1468 | ||
1469 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, | |
1470 | sizeof(struct nft_trans_chain)); | |
1471 | if (trans == NULL) { | |
1472 | free_percpu(stats); | |
1473 | return -ENOMEM; | |
1474 | } | |
1475 | ||
1476 | nft_trans_chain_stats(trans) = stats; | |
1477 | nft_trans_chain_update(trans) = true; | |
1478 | ||
1479 | if (nla[NFTA_CHAIN_POLICY]) | |
1480 | nft_trans_chain_policy(trans) = policy; | |
1481 | else | |
1482 | nft_trans_chain_policy(trans) = -1; | |
1483 | ||
1484 | name = nla[NFTA_CHAIN_NAME]; | |
1485 | if (nla[NFTA_CHAIN_HANDLE] && name) { | |
1486 | nft_trans_chain_name(trans) = | |
1487 | nla_strdup(name, GFP_KERNEL); | |
1488 | if (!nft_trans_chain_name(trans)) { | |
1489 | kfree(trans); | |
1490 | free_percpu(stats); | |
1491 | return -ENOMEM; | |
1492 | } | |
1493 | } | |
1494 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
1495 | ||
1496 | return 0; | |
1497 | } | |
1498 | ||
633c9a84 PNA |
1499 | static int nf_tables_newchain(struct net *net, struct sock *nlsk, |
1500 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1501 | const struct nlattr * const nla[], |
1502 | struct netlink_ext_ack *extack) | |
96518518 PM |
1503 | { |
1504 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1505 | const struct nlattr * uninitialized_var(name); | |
4035285f PNA |
1506 | u8 genmask = nft_genmask_next(net); |
1507 | int family = nfmsg->nfgen_family; | |
96518518 PM |
1508 | struct nft_table *table; |
1509 | struct nft_chain *chain; | |
57de2a0c | 1510 | u8 policy = NF_ACCEPT; |
4035285f | 1511 | struct nft_ctx ctx; |
96518518 | 1512 | u64 handle = 0; |
96518518 PM |
1513 | bool create; |
1514 | ||
1515 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1516 | ||
98319cb9 | 1517 | table = nf_tables_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, |
36596dad | 1518 | genmask); |
96518518 PM |
1519 | if (IS_ERR(table)) |
1520 | return PTR_ERR(table); | |
1521 | ||
96518518 PM |
1522 | chain = NULL; |
1523 | name = nla[NFTA_CHAIN_NAME]; | |
1524 | ||
1525 | if (nla[NFTA_CHAIN_HANDLE]) { | |
1526 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
664b0f8c | 1527 | chain = nf_tables_chain_lookup_byhandle(table, handle, genmask); |
96518518 PM |
1528 | if (IS_ERR(chain)) |
1529 | return PTR_ERR(chain); | |
1530 | } else { | |
664b0f8c | 1531 | chain = nf_tables_chain_lookup(table, name, genmask); |
96518518 PM |
1532 | if (IS_ERR(chain)) { |
1533 | if (PTR_ERR(chain) != -ENOENT) | |
1534 | return PTR_ERR(chain); | |
1535 | chain = NULL; | |
1536 | } | |
1537 | } | |
1538 | ||
57de2a0c | 1539 | if (nla[NFTA_CHAIN_POLICY]) { |
f323d954 PNA |
1540 | if (chain != NULL && |
1541 | !nft_is_base_chain(chain)) | |
d6b6cb1d PNA |
1542 | return -EOPNOTSUPP; |
1543 | ||
1544 | if (chain == NULL && | |
57de2a0c PM |
1545 | nla[NFTA_CHAIN_HOOK] == NULL) |
1546 | return -EOPNOTSUPP; | |
1547 | ||
8f46df18 | 1548 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
1549 | switch (policy) { |
1550 | case NF_DROP: | |
1551 | case NF_ACCEPT: | |
1552 | break; | |
1553 | default: | |
1554 | return -EINVAL; | |
1555 | } | |
1556 | } | |
1557 | ||
98319cb9 | 1558 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
4035285f | 1559 | |
96518518 PM |
1560 | if (chain != NULL) { |
1561 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1562 | return -EEXIST; | |
1563 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1564 | return -EOPNOTSUPP; | |
1565 | ||
2c4a488a | 1566 | return nf_tables_updchain(&ctx, genmask, policy, create); |
96518518 PM |
1567 | } |
1568 | ||
4035285f | 1569 | return nf_tables_addchain(&ctx, family, genmask, policy, create); |
96518518 PM |
1570 | } |
1571 | ||
633c9a84 PNA |
1572 | static int nf_tables_delchain(struct net *net, struct sock *nlsk, |
1573 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1574 | const struct nlattr * const nla[], |
1575 | struct netlink_ext_ack *extack) | |
96518518 PM |
1576 | { |
1577 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 1578 | u8 genmask = nft_genmask_next(net); |
96518518 PM |
1579 | struct nft_table *table; |
1580 | struct nft_chain *chain; | |
9dee1474 | 1581 | struct nft_rule *rule; |
96518518 | 1582 | int family = nfmsg->nfgen_family; |
91c7b38d | 1583 | struct nft_ctx ctx; |
3ecbfd65 | 1584 | u64 handle; |
9dee1474 PNA |
1585 | u32 use; |
1586 | int err; | |
96518518 | 1587 | |
98319cb9 | 1588 | table = nf_tables_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, |
36596dad | 1589 | genmask); |
96518518 PM |
1590 | if (IS_ERR(table)) |
1591 | return PTR_ERR(table); | |
1592 | ||
3ecbfd65 HS |
1593 | if (nla[NFTA_CHAIN_HANDLE]) { |
1594 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
1595 | chain = nf_tables_chain_lookup_byhandle(table, handle, genmask); | |
1596 | } else { | |
1597 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask); | |
1598 | } | |
96518518 PM |
1599 | if (IS_ERR(chain)) |
1600 | return PTR_ERR(chain); | |
9dee1474 PNA |
1601 | |
1602 | if (nlh->nlmsg_flags & NLM_F_NONREC && | |
1603 | chain->use > 0) | |
96518518 PM |
1604 | return -EBUSY; |
1605 | ||
98319cb9 | 1606 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0165d932 | 1607 | |
9dee1474 PNA |
1608 | use = chain->use; |
1609 | list_for_each_entry(rule, &chain->rules, list) { | |
1610 | if (!nft_is_active_next(net, rule)) | |
1611 | continue; | |
1612 | use--; | |
1613 | ||
1614 | err = nft_delrule(&ctx, rule); | |
1615 | if (err < 0) | |
1616 | return err; | |
1617 | } | |
1618 | ||
1619 | /* There are rules and elements that are still holding references to us, | |
1620 | * we cannot do a recursive removal in this case. | |
1621 | */ | |
1622 | if (use > 0) | |
1623 | return -EBUSY; | |
1624 | ||
ee01d542 | 1625 | return nft_delchain(&ctx); |
96518518 PM |
1626 | } |
1627 | ||
96518518 PM |
1628 | /* |
1629 | * Expressions | |
1630 | */ | |
1631 | ||
1632 | /** | |
ef1f7df9 PM |
1633 | * nft_register_expr - register nf_tables expr type |
1634 | * @ops: expr type | |
96518518 | 1635 | * |
ef1f7df9 | 1636 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1637 | * success or a negative errno code otherwise. |
1638 | */ | |
ef1f7df9 | 1639 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1640 | { |
1641 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1642 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1643 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1644 | else |
e688a7f8 | 1645 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1646 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1647 | return 0; | |
1648 | } | |
1649 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1650 | ||
1651 | /** | |
ef1f7df9 PM |
1652 | * nft_unregister_expr - unregister nf_tables expr type |
1653 | * @ops: expr type | |
96518518 | 1654 | * |
ef1f7df9 | 1655 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1656 | */ |
ef1f7df9 | 1657 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1658 | { |
1659 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1660 | list_del_rcu(&type->list); |
96518518 PM |
1661 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1662 | } | |
1663 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1664 | ||
64d46806 PM |
1665 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1666 | struct nlattr *nla) | |
96518518 | 1667 | { |
ef1f7df9 | 1668 | const struct nft_expr_type *type; |
96518518 | 1669 | |
ef1f7df9 | 1670 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1671 | if (!nla_strcmp(nla, type->name) && |
1672 | (!type->family || type->family == family)) | |
ef1f7df9 | 1673 | return type; |
96518518 PM |
1674 | } |
1675 | return NULL; | |
1676 | } | |
1677 | ||
64d46806 PM |
1678 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1679 | struct nlattr *nla) | |
96518518 | 1680 | { |
ef1f7df9 | 1681 | const struct nft_expr_type *type; |
96518518 PM |
1682 | |
1683 | if (nla == NULL) | |
1684 | return ERR_PTR(-EINVAL); | |
1685 | ||
64d46806 | 1686 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1687 | if (type != NULL && try_module_get(type->owner)) |
1688 | return type; | |
96518518 PM |
1689 | |
1690 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1691 | if (type == NULL) { |
64d46806 PM |
1692 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1693 | request_module("nft-expr-%u-%.*s", family, | |
1694 | nla_len(nla), (char *)nla_data(nla)); | |
1695 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1696 | if (__nft_expr_type_get(family, nla)) | |
1697 | return ERR_PTR(-EAGAIN); | |
1698 | ||
96518518 PM |
1699 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1700 | request_module("nft-expr-%.*s", | |
1701 | nla_len(nla), (char *)nla_data(nla)); | |
1702 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1703 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1704 | return ERR_PTR(-EAGAIN); |
1705 | } | |
1706 | #endif | |
1707 | return ERR_PTR(-ENOENT); | |
1708 | } | |
1709 | ||
1710 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1711 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1712 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1713 | }; | |
1714 | ||
1715 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1716 | const struct nft_expr *expr) | |
1717 | { | |
ef1f7df9 | 1718 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1719 | goto nla_put_failure; |
1720 | ||
1721 | if (expr->ops->dump) { | |
1722 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1723 | if (data == NULL) | |
1724 | goto nla_put_failure; | |
1725 | if (expr->ops->dump(skb, expr) < 0) | |
1726 | goto nla_put_failure; | |
1727 | nla_nest_end(skb, data); | |
1728 | } | |
1729 | ||
1730 | return skb->len; | |
1731 | ||
1732 | nla_put_failure: | |
1733 | return -1; | |
1734 | }; | |
1735 | ||
0b2d8a7b PM |
1736 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, |
1737 | const struct nft_expr *expr) | |
1738 | { | |
1739 | struct nlattr *nest; | |
1740 | ||
1741 | nest = nla_nest_start(skb, attr); | |
1742 | if (!nest) | |
1743 | goto nla_put_failure; | |
1744 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1745 | goto nla_put_failure; | |
1746 | nla_nest_end(skb, nest); | |
1747 | return 0; | |
1748 | ||
1749 | nla_put_failure: | |
1750 | return -1; | |
1751 | } | |
1752 | ||
96518518 PM |
1753 | struct nft_expr_info { |
1754 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1755 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1756 | }; |
1757 | ||
0ca743a5 PNA |
1758 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1759 | const struct nlattr *nla, | |
96518518 PM |
1760 | struct nft_expr_info *info) |
1761 | { | |
ef1f7df9 | 1762 | const struct nft_expr_type *type; |
96518518 | 1763 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1764 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1765 | int err; |
1766 | ||
fceb6435 | 1767 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL); |
96518518 PM |
1768 | if (err < 0) |
1769 | return err; | |
1770 | ||
36596dad | 1771 | type = nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1772 | if (IS_ERR(type)) |
1773 | return PTR_ERR(type); | |
1774 | ||
1775 | if (tb[NFTA_EXPR_DATA]) { | |
1776 | err = nla_parse_nested(info->tb, type->maxattr, | |
fceb6435 | 1777 | tb[NFTA_EXPR_DATA], type->policy, NULL); |
ef1f7df9 PM |
1778 | if (err < 0) |
1779 | goto err1; | |
1780 | } else | |
1781 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1782 | ||
1783 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1784 | ops = type->select_ops(ctx, |
1785 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1786 | if (IS_ERR(ops)) { |
1787 | err = PTR_ERR(ops); | |
1788 | goto err1; | |
1789 | } | |
1790 | } else | |
1791 | ops = type->ops; | |
1792 | ||
96518518 PM |
1793 | info->ops = ops; |
1794 | return 0; | |
ef1f7df9 PM |
1795 | |
1796 | err1: | |
1797 | module_put(type->owner); | |
1798 | return err; | |
96518518 PM |
1799 | } |
1800 | ||
1801 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1802 | const struct nft_expr_info *info, |
96518518 PM |
1803 | struct nft_expr *expr) |
1804 | { | |
1805 | const struct nft_expr_ops *ops = info->ops; | |
1806 | int err; | |
1807 | ||
1808 | expr->ops = ops; | |
1809 | if (ops->init) { | |
ef1f7df9 | 1810 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1811 | if (err < 0) |
1812 | goto err1; | |
1813 | } | |
1814 | ||
c56e3956 LZ |
1815 | if (ops->validate) { |
1816 | const struct nft_data *data = NULL; | |
1817 | ||
1818 | err = ops->validate(ctx, expr, &data); | |
1819 | if (err < 0) | |
1820 | goto err2; | |
1821 | } | |
1822 | ||
96518518 PM |
1823 | return 0; |
1824 | ||
c56e3956 LZ |
1825 | err2: |
1826 | if (ops->destroy) | |
1827 | ops->destroy(ctx, expr); | |
96518518 PM |
1828 | err1: |
1829 | expr->ops = NULL; | |
1830 | return err; | |
1831 | } | |
1832 | ||
62472bce PM |
1833 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1834 | struct nft_expr *expr) | |
96518518 PM |
1835 | { |
1836 | if (expr->ops->destroy) | |
62472bce | 1837 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1838 | module_put(expr->ops->type->owner); |
96518518 PM |
1839 | } |
1840 | ||
0b2d8a7b PM |
1841 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
1842 | const struct nlattr *nla) | |
1843 | { | |
1844 | struct nft_expr_info info; | |
1845 | struct nft_expr *expr; | |
1846 | int err; | |
1847 | ||
1848 | err = nf_tables_expr_parse(ctx, nla, &info); | |
1849 | if (err < 0) | |
1850 | goto err1; | |
1851 | ||
1852 | err = -ENOMEM; | |
1853 | expr = kzalloc(info.ops->size, GFP_KERNEL); | |
1854 | if (expr == NULL) | |
1855 | goto err2; | |
1856 | ||
1857 | err = nf_tables_newexpr(ctx, &info, expr); | |
1858 | if (err < 0) | |
6cafaf47 | 1859 | goto err3; |
0b2d8a7b PM |
1860 | |
1861 | return expr; | |
6cafaf47 LZ |
1862 | err3: |
1863 | kfree(expr); | |
0b2d8a7b PM |
1864 | err2: |
1865 | module_put(info.ops->type->owner); | |
1866 | err1: | |
1867 | return ERR_PTR(err); | |
1868 | } | |
1869 | ||
1870 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) | |
1871 | { | |
1872 | nf_tables_expr_destroy(ctx, expr); | |
1873 | kfree(expr); | |
1874 | } | |
1875 | ||
96518518 PM |
1876 | /* |
1877 | * Rules | |
1878 | */ | |
1879 | ||
1880 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1881 | u64 handle) | |
1882 | { | |
1883 | struct nft_rule *rule; | |
1884 | ||
1885 | // FIXME: this sucks | |
1886 | list_for_each_entry(rule, &chain->rules, list) { | |
1887 | if (handle == rule->handle) | |
1888 | return rule; | |
1889 | } | |
1890 | ||
1891 | return ERR_PTR(-ENOENT); | |
1892 | } | |
1893 | ||
1894 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1895 | const struct nlattr *nla) | |
1896 | { | |
1897 | if (nla == NULL) | |
1898 | return ERR_PTR(-EINVAL); | |
1899 | ||
1900 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1901 | } | |
1902 | ||
1903 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
b2fbd044 LZ |
1904 | [NFTA_RULE_TABLE] = { .type = NLA_STRING, |
1905 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
96518518 PM |
1906 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
1907 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1908 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1909 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1910 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1911 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1912 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1913 | .len = NFT_USERDATA_MAXLEN }, | |
96518518 PM |
1914 | }; |
1915 | ||
84d7fce6 PNA |
1916 | static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, |
1917 | u32 portid, u32 seq, int event, | |
1918 | u32 flags, int family, | |
96518518 PM |
1919 | const struct nft_table *table, |
1920 | const struct nft_chain *chain, | |
1921 | const struct nft_rule *rule) | |
1922 | { | |
1923 | struct nlmsghdr *nlh; | |
1924 | struct nfgenmsg *nfmsg; | |
1925 | const struct nft_expr *expr, *next; | |
1926 | struct nlattr *list; | |
5e948466 | 1927 | const struct nft_rule *prule; |
dedb67c4 | 1928 | u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
96518518 | 1929 | |
dedb67c4 | 1930 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags); |
96518518 PM |
1931 | if (nlh == NULL) |
1932 | goto nla_put_failure; | |
1933 | ||
1934 | nfmsg = nlmsg_data(nlh); | |
1935 | nfmsg->nfgen_family = family; | |
1936 | nfmsg->version = NFNETLINK_V0; | |
84d7fce6 | 1937 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
96518518 PM |
1938 | |
1939 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1940 | goto nla_put_failure; | |
1941 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1942 | goto nla_put_failure; | |
b46f6ded ND |
1943 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), |
1944 | NFTA_RULE_PAD)) | |
96518518 PM |
1945 | goto nla_put_failure; |
1946 | ||
5e948466 | 1947 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
cbbb40e2 | 1948 | prule = list_prev_entry(rule, list); |
5e948466 | 1949 | if (nla_put_be64(skb, NFTA_RULE_POSITION, |
b46f6ded ND |
1950 | cpu_to_be64(prule->handle), |
1951 | NFTA_RULE_PAD)) | |
5e948466 EL |
1952 | goto nla_put_failure; |
1953 | } | |
1954 | ||
96518518 PM |
1955 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
1956 | if (list == NULL) | |
1957 | goto nla_put_failure; | |
1958 | nft_rule_for_each_expr(expr, next, rule) { | |
0b2d8a7b | 1959 | if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) |
96518518 | 1960 | goto nla_put_failure; |
96518518 PM |
1961 | } |
1962 | nla_nest_end(skb, list); | |
1963 | ||
86f1ec32 PM |
1964 | if (rule->udata) { |
1965 | struct nft_userdata *udata = nft_userdata(rule); | |
1966 | if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, | |
1967 | udata->data) < 0) | |
1968 | goto nla_put_failure; | |
1969 | } | |
0768b3b3 | 1970 | |
053c095a JB |
1971 | nlmsg_end(skb, nlh); |
1972 | return 0; | |
96518518 PM |
1973 | |
1974 | nla_put_failure: | |
1975 | nlmsg_trim(skb, nlh); | |
1976 | return -1; | |
1977 | } | |
1978 | ||
25e94a99 PNA |
1979 | static void nf_tables_rule_notify(const struct nft_ctx *ctx, |
1980 | const struct nft_rule *rule, int event) | |
96518518 PM |
1981 | { |
1982 | struct sk_buff *skb; | |
96518518 PM |
1983 | int err; |
1984 | ||
128ad332 PNA |
1985 | if (!ctx->report && |
1986 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 1987 | return; |
96518518 | 1988 | |
96518518 PM |
1989 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1990 | if (skb == NULL) | |
1991 | goto err; | |
1992 | ||
84d7fce6 | 1993 | err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, |
36596dad | 1994 | event, 0, ctx->family, ctx->table, |
35151d84 | 1995 | ctx->chain, rule); |
96518518 PM |
1996 | if (err < 0) { |
1997 | kfree_skb(skb); | |
1998 | goto err; | |
1999 | } | |
2000 | ||
25e94a99 PNA |
2001 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
2002 | ctx->report, GFP_KERNEL); | |
2003 | return; | |
96518518 | 2004 | err: |
25e94a99 | 2005 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); |
96518518 PM |
2006 | } |
2007 | ||
6e1f760e | 2008 | struct nft_rule_dump_ctx { |
e46abbcc | 2009 | char *table; |
b7263e07 | 2010 | char *chain; |
6e1f760e PNA |
2011 | }; |
2012 | ||
96518518 PM |
2013 | static int nf_tables_dump_rules(struct sk_buff *skb, |
2014 | struct netlink_callback *cb) | |
2015 | { | |
2016 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
6e1f760e | 2017 | const struct nft_rule_dump_ctx *ctx = cb->data; |
96518518 PM |
2018 | const struct nft_table *table; |
2019 | const struct nft_chain *chain; | |
2020 | const struct nft_rule *rule; | |
2021 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 2022 | struct net *net = sock_net(skb->sk); |
96518518 PM |
2023 | int family = nfmsg->nfgen_family; |
2024 | ||
e688a7f8 | 2025 | rcu_read_lock(); |
38e029f1 PNA |
2026 | cb->seq = net->nft.base_seq; |
2027 | ||
36596dad | 2028 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 2029 | if (family != NFPROTO_UNSPEC && family != table->family) |
36596dad PNA |
2030 | continue; |
2031 | ||
2032 | if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0) | |
96518518 PM |
2033 | continue; |
2034 | ||
36596dad PNA |
2035 | list_for_each_entry_rcu(chain, &table->chains, list) { |
2036 | if (ctx && ctx->chain && | |
2037 | strcmp(ctx->chain, chain->name) != 0) | |
6e1f760e PNA |
2038 | continue; |
2039 | ||
36596dad PNA |
2040 | list_for_each_entry_rcu(rule, &chain->rules, list) { |
2041 | if (!nft_is_active(net, rule)) | |
2042 | goto cont; | |
2043 | if (idx < s_idx) | |
2044 | goto cont; | |
2045 | if (idx > s_idx) | |
2046 | memset(&cb->args[1], 0, | |
2047 | sizeof(cb->args) - sizeof(cb->args[0])); | |
2048 | if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, | |
2049 | cb->nlh->nlmsg_seq, | |
2050 | NFT_MSG_NEWRULE, | |
2051 | NLM_F_MULTI | NLM_F_APPEND, | |
98319cb9 | 2052 | table->family, |
36596dad PNA |
2053 | table, chain, rule) < 0) |
2054 | goto done; | |
2055 | ||
2056 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 | 2057 | cont: |
36596dad | 2058 | idx++; |
96518518 PM |
2059 | } |
2060 | } | |
2061 | } | |
2062 | done: | |
e688a7f8 PNA |
2063 | rcu_read_unlock(); |
2064 | ||
96518518 PM |
2065 | cb->args[0] = idx; |
2066 | return skb->len; | |
2067 | } | |
2068 | ||
6e1f760e PNA |
2069 | static int nf_tables_dump_rules_done(struct netlink_callback *cb) |
2070 | { | |
e46abbcc PS |
2071 | struct nft_rule_dump_ctx *ctx = cb->data; |
2072 | ||
2073 | if (ctx) { | |
2074 | kfree(ctx->table); | |
b7263e07 | 2075 | kfree(ctx->chain); |
e46abbcc PS |
2076 | kfree(ctx); |
2077 | } | |
6e1f760e PNA |
2078 | return 0; |
2079 | } | |
2080 | ||
7b8002a1 PNA |
2081 | static int nf_tables_getrule(struct net *net, struct sock *nlsk, |
2082 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2083 | const struct nlattr * const nla[], |
2084 | struct netlink_ext_ack *extack) | |
96518518 PM |
2085 | { |
2086 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2087 | u8 genmask = nft_genmask_cur(net); |
96518518 PM |
2088 | const struct nft_table *table; |
2089 | const struct nft_chain *chain; | |
2090 | const struct nft_rule *rule; | |
2091 | struct sk_buff *skb2; | |
2092 | int family = nfmsg->nfgen_family; | |
2093 | int err; | |
2094 | ||
2095 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2096 | struct netlink_dump_control c = { | |
2097 | .dump = nf_tables_dump_rules, | |
6e1f760e | 2098 | .done = nf_tables_dump_rules_done, |
96518518 | 2099 | }; |
6e1f760e PNA |
2100 | |
2101 | if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { | |
2102 | struct nft_rule_dump_ctx *ctx; | |
2103 | ||
2104 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
2105 | if (!ctx) | |
2106 | return -ENOMEM; | |
2107 | ||
e46abbcc PS |
2108 | if (nla[NFTA_RULE_TABLE]) { |
2109 | ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], | |
2110 | GFP_KERNEL); | |
2111 | if (!ctx->table) { | |
2112 | kfree(ctx); | |
2113 | return -ENOMEM; | |
2114 | } | |
2115 | } | |
b7263e07 PS |
2116 | if (nla[NFTA_RULE_CHAIN]) { |
2117 | ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], | |
2118 | GFP_KERNEL); | |
2119 | if (!ctx->chain) { | |
2120 | kfree(ctx->table); | |
2121 | kfree(ctx); | |
2122 | return -ENOMEM; | |
2123 | } | |
2124 | } | |
6e1f760e PNA |
2125 | c.data = ctx; |
2126 | } | |
2127 | ||
96518518 PM |
2128 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2129 | } | |
2130 | ||
98319cb9 | 2131 | table = nf_tables_table_lookup(net, nla[NFTA_RULE_TABLE], family, |
36596dad | 2132 | genmask); |
96518518 PM |
2133 | if (IS_ERR(table)) |
2134 | return PTR_ERR(table); | |
2135 | ||
664b0f8c | 2136 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2137 | if (IS_ERR(chain)) |
2138 | return PTR_ERR(chain); | |
2139 | ||
2140 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
2141 | if (IS_ERR(rule)) | |
2142 | return PTR_ERR(rule); | |
2143 | ||
2144 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2145 | if (!skb2) | |
2146 | return -ENOMEM; | |
2147 | ||
84d7fce6 | 2148 | err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, |
96518518 PM |
2149 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
2150 | family, table, chain, rule); | |
2151 | if (err < 0) | |
2152 | goto err; | |
2153 | ||
2154 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2155 | ||
2156 | err: | |
2157 | kfree_skb(skb2); | |
2158 | return err; | |
2159 | } | |
2160 | ||
62472bce PM |
2161 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
2162 | struct nft_rule *rule) | |
96518518 | 2163 | { |
96518518 PM |
2164 | struct nft_expr *expr; |
2165 | ||
2166 | /* | |
2167 | * Careful: some expressions might not be initialized in case this | |
2168 | * is called on error from nf_tables_newrule(). | |
2169 | */ | |
2170 | expr = nft_expr_first(rule); | |
3e38df13 | 2171 | while (expr != nft_expr_last(rule) && expr->ops) { |
62472bce | 2172 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
2173 | expr = nft_expr_next(expr); |
2174 | } | |
2175 | kfree(rule); | |
2176 | } | |
2177 | ||
1081d11b PNA |
2178 | #define NFT_RULE_MAXEXPRS 128 |
2179 | ||
2180 | static struct nft_expr_info *info; | |
2181 | ||
633c9a84 PNA |
2182 | static int nf_tables_newrule(struct net *net, struct sock *nlsk, |
2183 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2184 | const struct nlattr * const nla[], |
2185 | struct netlink_ext_ack *extack) | |
96518518 PM |
2186 | { |
2187 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2188 | u8 genmask = nft_genmask_next(net); |
98319cb9 | 2189 | int family = nfmsg->nfgen_family; |
96518518 PM |
2190 | struct nft_table *table; |
2191 | struct nft_chain *chain; | |
2192 | struct nft_rule *rule, *old_rule = NULL; | |
86f1ec32 | 2193 | struct nft_userdata *udata; |
1081d11b | 2194 | struct nft_trans *trans = NULL; |
96518518 PM |
2195 | struct nft_expr *expr; |
2196 | struct nft_ctx ctx; | |
2197 | struct nlattr *tmp; | |
86f1ec32 | 2198 | unsigned int size, i, n, ulen = 0, usize = 0; |
96518518 PM |
2199 | int err, rem; |
2200 | bool create; | |
5e948466 | 2201 | u64 handle, pos_handle; |
96518518 PM |
2202 | |
2203 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
2204 | ||
98319cb9 | 2205 | table = nf_tables_table_lookup(net, nla[NFTA_RULE_TABLE], family, |
36596dad | 2206 | genmask); |
96518518 PM |
2207 | if (IS_ERR(table)) |
2208 | return PTR_ERR(table); | |
2209 | ||
664b0f8c | 2210 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask); |
96518518 PM |
2211 | if (IS_ERR(chain)) |
2212 | return PTR_ERR(chain); | |
2213 | ||
2214 | if (nla[NFTA_RULE_HANDLE]) { | |
2215 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
2216 | rule = __nf_tables_rule_lookup(chain, handle); | |
2217 | if (IS_ERR(rule)) | |
2218 | return PTR_ERR(rule); | |
2219 | ||
2220 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2221 | return -EEXIST; | |
2222 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2223 | old_rule = rule; | |
2224 | else | |
2225 | return -EOPNOTSUPP; | |
2226 | } else { | |
2227 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
2228 | return -EINVAL; | |
2229 | handle = nf_tables_alloc_handle(table); | |
a0a7379e PNA |
2230 | |
2231 | if (chain->use == UINT_MAX) | |
2232 | return -EOVERFLOW; | |
96518518 PM |
2233 | } |
2234 | ||
5e948466 EL |
2235 | if (nla[NFTA_RULE_POSITION]) { |
2236 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2237 | return -EOPNOTSUPP; | |
2238 | ||
2239 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
2240 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
2241 | if (IS_ERR(old_rule)) | |
2242 | return PTR_ERR(old_rule); | |
2243 | } | |
2244 | ||
98319cb9 | 2245 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0ca743a5 | 2246 | |
96518518 PM |
2247 | n = 0; |
2248 | size = 0; | |
2249 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
2250 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
2251 | err = -EINVAL; | |
2252 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
2253 | goto err1; | |
2254 | if (n == NFT_RULE_MAXEXPRS) | |
2255 | goto err1; | |
0ca743a5 | 2256 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
2257 | if (err < 0) |
2258 | goto err1; | |
2259 | size += info[n].ops->size; | |
2260 | n++; | |
2261 | } | |
2262 | } | |
9889840f PM |
2263 | /* Check for overflow of dlen field */ |
2264 | err = -EFBIG; | |
2265 | if (size >= 1 << 12) | |
2266 | goto err1; | |
96518518 | 2267 | |
86f1ec32 | 2268 | if (nla[NFTA_RULE_USERDATA]) { |
0768b3b3 | 2269 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
86f1ec32 PM |
2270 | if (ulen > 0) |
2271 | usize = sizeof(struct nft_userdata) + ulen; | |
2272 | } | |
0768b3b3 | 2273 | |
96518518 | 2274 | err = -ENOMEM; |
86f1ec32 | 2275 | rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); |
96518518 PM |
2276 | if (rule == NULL) |
2277 | goto err1; | |
2278 | ||
889f7ee7 | 2279 | nft_activate_next(net, rule); |
0628b123 | 2280 | |
96518518 PM |
2281 | rule->handle = handle; |
2282 | rule->dlen = size; | |
86f1ec32 | 2283 | rule->udata = ulen ? 1 : 0; |
0768b3b3 | 2284 | |
86f1ec32 PM |
2285 | if (ulen) { |
2286 | udata = nft_userdata(rule); | |
2287 | udata->len = ulen - 1; | |
2288 | nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); | |
2289 | } | |
96518518 | 2290 | |
96518518 PM |
2291 | expr = nft_expr_first(rule); |
2292 | for (i = 0; i < n; i++) { | |
2293 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
2294 | if (err < 0) | |
2295 | goto err2; | |
ef1f7df9 | 2296 | info[i].ops = NULL; |
96518518 PM |
2297 | expr = nft_expr_next(expr); |
2298 | } | |
2299 | ||
96518518 | 2300 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
889f7ee7 | 2301 | if (nft_is_active_next(net, old_rule)) { |
ac904ac8 | 2302 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
b380e5c7 | 2303 | old_rule); |
1081d11b | 2304 | if (trans == NULL) { |
0628b123 PNA |
2305 | err = -ENOMEM; |
2306 | goto err2; | |
2307 | } | |
889f7ee7 | 2308 | nft_deactivate_next(net, old_rule); |
ac34b861 | 2309 | chain->use--; |
5bc5c307 | 2310 | list_add_tail_rcu(&rule->list, &old_rule->list); |
0628b123 PNA |
2311 | } else { |
2312 | err = -ENOENT; | |
2313 | goto err2; | |
2314 | } | |
96518518 | 2315 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
2316 | if (old_rule) |
2317 | list_add_rcu(&rule->list, &old_rule->list); | |
2318 | else | |
2319 | list_add_tail_rcu(&rule->list, &chain->rules); | |
2320 | else { | |
2321 | if (old_rule) | |
2322 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
2323 | else | |
2324 | list_add_rcu(&rule->list, &chain->rules); | |
2325 | } | |
96518518 | 2326 | |
b380e5c7 | 2327 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
0628b123 PNA |
2328 | err = -ENOMEM; |
2329 | goto err3; | |
2330 | } | |
4fefee57 | 2331 | chain->use++; |
96518518 PM |
2332 | return 0; |
2333 | ||
0628b123 PNA |
2334 | err3: |
2335 | list_del_rcu(&rule->list); | |
96518518 | 2336 | err2: |
62472bce | 2337 | nf_tables_rule_destroy(&ctx, rule); |
96518518 PM |
2338 | err1: |
2339 | for (i = 0; i < n; i++) { | |
2340 | if (info[i].ops != NULL) | |
ef1f7df9 | 2341 | module_put(info[i].ops->type->owner); |
96518518 PM |
2342 | } |
2343 | return err; | |
2344 | } | |
2345 | ||
1a94e38d PNA |
2346 | static struct nft_rule *nft_rule_lookup_byid(const struct net *net, |
2347 | const struct nlattr *nla) | |
2348 | { | |
2349 | u32 id = ntohl(nla_get_be32(nla)); | |
2350 | struct nft_trans *trans; | |
2351 | ||
2352 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
2353 | struct nft_rule *rule = nft_trans_rule(trans); | |
2354 | ||
2355 | if (trans->msg_type == NFT_MSG_NEWRULE && | |
2356 | id == nft_trans_rule_id(trans)) | |
2357 | return rule; | |
2358 | } | |
2359 | return ERR_PTR(-ENOENT); | |
2360 | } | |
2361 | ||
633c9a84 PNA |
2362 | static int nf_tables_delrule(struct net *net, struct sock *nlsk, |
2363 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2364 | const struct nlattr * const nla[], |
2365 | struct netlink_ext_ack *extack) | |
96518518 PM |
2366 | { |
2367 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2368 | u8 genmask = nft_genmask_next(net); |
7c95f6d8 | 2369 | struct nft_table *table; |
cf9dc09d PNA |
2370 | struct nft_chain *chain = NULL; |
2371 | struct nft_rule *rule; | |
0628b123 PNA |
2372 | int family = nfmsg->nfgen_family, err = 0; |
2373 | struct nft_ctx ctx; | |
96518518 | 2374 | |
98319cb9 | 2375 | table = nf_tables_table_lookup(net, nla[NFTA_RULE_TABLE], family, |
36596dad | 2376 | genmask); |
96518518 PM |
2377 | if (IS_ERR(table)) |
2378 | return PTR_ERR(table); | |
2379 | ||
cf9dc09d | 2380 | if (nla[NFTA_RULE_CHAIN]) { |
664b0f8c PNA |
2381 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], |
2382 | genmask); | |
cf9dc09d PNA |
2383 | if (IS_ERR(chain)) |
2384 | return PTR_ERR(chain); | |
2385 | } | |
96518518 | 2386 | |
98319cb9 | 2387 | nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla); |
0628b123 | 2388 | |
cf9dc09d PNA |
2389 | if (chain) { |
2390 | if (nla[NFTA_RULE_HANDLE]) { | |
2391 | rule = nf_tables_rule_lookup(chain, | |
2392 | nla[NFTA_RULE_HANDLE]); | |
2393 | if (IS_ERR(rule)) | |
2394 | return PTR_ERR(rule); | |
96518518 | 2395 | |
1a94e38d PNA |
2396 | err = nft_delrule(&ctx, rule); |
2397 | } else if (nla[NFTA_RULE_ID]) { | |
2398 | rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]); | |
2399 | if (IS_ERR(rule)) | |
2400 | return PTR_ERR(rule); | |
2401 | ||
5e266fe7 | 2402 | err = nft_delrule(&ctx, rule); |
cf9dc09d | 2403 | } else { |
ce24b721 | 2404 | err = nft_delrule_by_chain(&ctx); |
cf9dc09d PNA |
2405 | } |
2406 | } else { | |
2407 | list_for_each_entry(chain, &table->chains, list) { | |
664b0f8c PNA |
2408 | if (!nft_is_active_next(net, chain)) |
2409 | continue; | |
2410 | ||
cf9dc09d | 2411 | ctx.chain = chain; |
ce24b721 | 2412 | err = nft_delrule_by_chain(&ctx); |
0628b123 PNA |
2413 | if (err < 0) |
2414 | break; | |
2415 | } | |
2416 | } | |
2417 | ||
2418 | return err; | |
2419 | } | |
2420 | ||
20a69341 PM |
2421 | /* |
2422 | * Sets | |
2423 | */ | |
2424 | ||
2b664957 | 2425 | static LIST_HEAD(nf_tables_set_types); |
20a69341 | 2426 | |
2b664957 | 2427 | int nft_register_set(struct nft_set_type *type) |
20a69341 PM |
2428 | { |
2429 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2430 | list_add_tail_rcu(&type->list, &nf_tables_set_types); |
20a69341 PM |
2431 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2432 | return 0; | |
2433 | } | |
2434 | EXPORT_SYMBOL_GPL(nft_register_set); | |
2435 | ||
2b664957 | 2436 | void nft_unregister_set(struct nft_set_type *type) |
20a69341 PM |
2437 | { |
2438 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2439 | list_del_rcu(&type->list); |
20a69341 PM |
2440 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2441 | } | |
2442 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
2443 | ||
2b664957 PNA |
2444 | #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ |
2445 | NFT_SET_TIMEOUT | NFT_SET_OBJECT) | |
2446 | ||
2447 | static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags) | |
2448 | { | |
2449 | return (flags & ops->features) == (flags & NFT_SET_FEATURES); | |
2450 | } | |
2451 | ||
c50b960c PM |
2452 | /* |
2453 | * Select a set implementation based on the data characteristics and the | |
2454 | * given policy. The total memory use might not be known if no size is | |
2455 | * given, in that case the amount of memory per element is used. | |
2456 | */ | |
2457 | static const struct nft_set_ops * | |
2b664957 PNA |
2458 | nft_select_set_ops(const struct nft_ctx *ctx, |
2459 | const struct nlattr * const nla[], | |
c50b960c PM |
2460 | const struct nft_set_desc *desc, |
2461 | enum nft_set_policies policy) | |
20a69341 | 2462 | { |
c50b960c PM |
2463 | const struct nft_set_ops *ops, *bops; |
2464 | struct nft_set_estimate est, best; | |
2b664957 PNA |
2465 | const struct nft_set_type *type; |
2466 | u32 flags = 0; | |
20a69341 PM |
2467 | |
2468 | #ifdef CONFIG_MODULES | |
2b664957 | 2469 | if (list_empty(&nf_tables_set_types)) { |
20a69341 PM |
2470 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2471 | request_module("nft-set"); | |
2472 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
2b664957 | 2473 | if (!list_empty(&nf_tables_set_types)) |
20a69341 PM |
2474 | return ERR_PTR(-EAGAIN); |
2475 | } | |
2476 | #endif | |
2b664957 PNA |
2477 | if (nla[NFTA_SET_FLAGS] != NULL) |
2478 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
20a69341 | 2479 | |
55af753c PNA |
2480 | bops = NULL; |
2481 | best.size = ~0; | |
2482 | best.lookup = ~0; | |
0b5a7874 | 2483 | best.space = ~0; |
c50b960c | 2484 | |
2b664957 PNA |
2485 | list_for_each_entry(type, &nf_tables_set_types, list) { |
2486 | if (!type->select_ops) | |
2487 | ops = type->ops; | |
2488 | else | |
2489 | ops = type->select_ops(ctx, desc, flags); | |
2490 | if (!ops) | |
2491 | continue; | |
2492 | ||
2493 | if (!nft_set_ops_candidate(ops, flags)) | |
20a69341 | 2494 | continue; |
2b664957 | 2495 | if (!ops->estimate(desc, flags, &est)) |
c50b960c PM |
2496 | continue; |
2497 | ||
2498 | switch (policy) { | |
2499 | case NFT_SET_POL_PERFORMANCE: | |
55af753c | 2500 | if (est.lookup < best.lookup) |
c50b960c | 2501 | break; |
644e334e PNA |
2502 | if (est.lookup == best.lookup && |
2503 | est.space < best.space) | |
2504 | break; | |
c50b960c PM |
2505 | continue; |
2506 | case NFT_SET_POL_MEMORY: | |
0b5a7874 PNA |
2507 | if (!desc->size) { |
2508 | if (est.space < best.space) | |
2509 | break; | |
2510 | if (est.space == best.space && | |
2511 | est.lookup < best.lookup) | |
2512 | break; | |
2513 | } else if (est.size < best.size) { | |
c50b960c | 2514 | break; |
0b5a7874 | 2515 | } |
c50b960c PM |
2516 | continue; |
2517 | default: | |
2518 | break; | |
2519 | } | |
2520 | ||
2b664957 | 2521 | if (!try_module_get(type->owner)) |
20a69341 | 2522 | continue; |
c50b960c | 2523 | if (bops != NULL) |
2b664957 | 2524 | module_put(bops->type->owner); |
c50b960c PM |
2525 | |
2526 | bops = ops; | |
2527 | best = est; | |
20a69341 PM |
2528 | } |
2529 | ||
c50b960c PM |
2530 | if (bops != NULL) |
2531 | return bops; | |
2532 | ||
20a69341 PM |
2533 | return ERR_PTR(-EOPNOTSUPP); |
2534 | } | |
2535 | ||
2536 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
b2fbd044 LZ |
2537 | [NFTA_SET_TABLE] = { .type = NLA_STRING, |
2538 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
a9bdd836 | 2539 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
cb39ad8b | 2540 | .len = NFT_SET_MAXNAMELEN - 1 }, |
20a69341 PM |
2541 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2542 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2543 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2544 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2545 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2546 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2547 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2548 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
761da293 PM |
2549 | [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, |
2550 | [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, | |
e6d8ecac CFG |
2551 | [NFTA_SET_USERDATA] = { .type = NLA_BINARY, |
2552 | .len = NFT_USERDATA_MAXLEN }, | |
8aeff920 | 2553 | [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, |
3ecbfd65 | 2554 | [NFTA_SET_HANDLE] = { .type = NLA_U64 }, |
c50b960c PM |
2555 | }; |
2556 | ||
2557 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2558 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2559 | }; |
2560 | ||
633c9a84 | 2561 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
2562 | const struct sk_buff *skb, |
2563 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
2564 | const struct nlattr * const nla[], |
2565 | u8 genmask) | |
20a69341 PM |
2566 | { |
2567 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
98319cb9 | 2568 | int family = nfmsg->nfgen_family; |
7c95f6d8 | 2569 | struct nft_table *table = NULL; |
20a69341 | 2570 | |
20a69341 | 2571 | if (nla[NFTA_SET_TABLE] != NULL) { |
36596dad | 2572 | table = nf_tables_table_lookup(net, nla[NFTA_SET_TABLE], |
98319cb9 | 2573 | family, genmask); |
20a69341 PM |
2574 | if (IS_ERR(table)) |
2575 | return PTR_ERR(table); | |
2576 | } | |
2577 | ||
98319cb9 | 2578 | nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 PM |
2579 | return 0; |
2580 | } | |
2581 | ||
c7a72e3f PNA |
2582 | static struct nft_set *nf_tables_set_lookup(const struct nft_table *table, |
2583 | const struct nlattr *nla, u8 genmask) | |
20a69341 PM |
2584 | { |
2585 | struct nft_set *set; | |
2586 | ||
2587 | if (nla == NULL) | |
2588 | return ERR_PTR(-EINVAL); | |
2589 | ||
2590 | list_for_each_entry(set, &table->sets, list) { | |
37a9cc52 PNA |
2591 | if (!nla_strcmp(nla, set->name) && |
2592 | nft_active_genmask(set, genmask)) | |
20a69341 PM |
2593 | return set; |
2594 | } | |
2595 | return ERR_PTR(-ENOENT); | |
2596 | } | |
2597 | ||
3ecbfd65 HS |
2598 | static struct nft_set *nf_tables_set_lookup_byhandle(const struct nft_table *table, |
2599 | const struct nlattr *nla, u8 genmask) | |
2600 | { | |
2601 | struct nft_set *set; | |
2602 | ||
2603 | if (nla == NULL) | |
2604 | return ERR_PTR(-EINVAL); | |
2605 | ||
2606 | list_for_each_entry(set, &table->sets, list) { | |
2607 | if (be64_to_cpu(nla_get_be64(nla)) == set->handle && | |
2608 | nft_active_genmask(set, genmask)) | |
2609 | return set; | |
2610 | } | |
2611 | return ERR_PTR(-ENOENT); | |
2612 | } | |
2613 | ||
c7a72e3f PNA |
2614 | static struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
2615 | const struct nlattr *nla, | |
2616 | u8 genmask) | |
958bee14 PNA |
2617 | { |
2618 | struct nft_trans *trans; | |
2619 | u32 id = ntohl(nla_get_be32(nla)); | |
2620 | ||
2621 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
37a9cc52 PNA |
2622 | struct nft_set *set = nft_trans_set(trans); |
2623 | ||
958bee14 | 2624 | if (trans->msg_type == NFT_MSG_NEWSET && |
37a9cc52 PNA |
2625 | id == nft_trans_set_id(trans) && |
2626 | nft_active_genmask(set, genmask)) | |
2627 | return set; | |
958bee14 PNA |
2628 | } |
2629 | return ERR_PTR(-ENOENT); | |
2630 | } | |
c7a72e3f PNA |
2631 | |
2632 | struct nft_set *nft_set_lookup(const struct net *net, | |
2633 | const struct nft_table *table, | |
2634 | const struct nlattr *nla_set_name, | |
2635 | const struct nlattr *nla_set_id, | |
2636 | u8 genmask) | |
2637 | { | |
2638 | struct nft_set *set; | |
2639 | ||
2640 | set = nf_tables_set_lookup(table, nla_set_name, genmask); | |
2641 | if (IS_ERR(set)) { | |
2642 | if (!nla_set_id) | |
2643 | return set; | |
2644 | ||
2645 | set = nf_tables_set_lookup_byid(net, nla_set_id, genmask); | |
2646 | } | |
2647 | return set; | |
2648 | } | |
2649 | EXPORT_SYMBOL_GPL(nft_set_lookup); | |
958bee14 | 2650 | |
20a69341 PM |
2651 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
2652 | const char *name) | |
2653 | { | |
2654 | const struct nft_set *i; | |
2655 | const char *p; | |
2656 | unsigned long *inuse; | |
60eb1894 | 2657 | unsigned int n = 0, min = 0; |
20a69341 | 2658 | |
38745490 | 2659 | p = strchr(name, '%'); |
20a69341 PM |
2660 | if (p != NULL) { |
2661 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2662 | return -EINVAL; | |
2663 | ||
2664 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2665 | if (inuse == NULL) | |
2666 | return -ENOMEM; | |
60eb1894 | 2667 | cont: |
20a69341 | 2668 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2669 | int tmp; |
2670 | ||
37a9cc52 PNA |
2671 | if (!nft_is_active_next(ctx->net, set)) |
2672 | continue; | |
14662917 | 2673 | if (!sscanf(i->name, name, &tmp)) |
20a69341 | 2674 | continue; |
60eb1894 | 2675 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2676 | continue; |
14662917 | 2677 | |
60eb1894 | 2678 | set_bit(tmp - min, inuse); |
20a69341 PM |
2679 | } |
2680 | ||
53b70287 | 2681 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2682 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2683 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2684 | memset(inuse, 0, PAGE_SIZE); | |
2685 | goto cont; | |
2686 | } | |
20a69341 PM |
2687 | free_page((unsigned long)inuse); |
2688 | } | |
2689 | ||
38745490 PS |
2690 | set->name = kasprintf(GFP_KERNEL, name, min + n); |
2691 | if (!set->name) | |
2692 | return -ENOMEM; | |
2693 | ||
20a69341 | 2694 | list_for_each_entry(i, &ctx->table->sets, list) { |
37a9cc52 PNA |
2695 | if (!nft_is_active_next(ctx->net, i)) |
2696 | continue; | |
e63aaaa6 AY |
2697 | if (!strcmp(set->name, i->name)) { |
2698 | kfree(set->name); | |
20a69341 | 2699 | return -ENFILE; |
e63aaaa6 | 2700 | } |
20a69341 PM |
2701 | } |
2702 | return 0; | |
2703 | } | |
2704 | ||
2705 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2706 | const struct nft_set *set, u16 event, u16 flags) | |
2707 | { | |
2708 | struct nfgenmsg *nfmsg; | |
2709 | struct nlmsghdr *nlh; | |
c50b960c | 2710 | struct nlattr *desc; |
128ad332 PNA |
2711 | u32 portid = ctx->portid; |
2712 | u32 seq = ctx->seq; | |
20a69341 | 2713 | |
dedb67c4 | 2714 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
20a69341 PM |
2715 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
2716 | flags); | |
2717 | if (nlh == NULL) | |
2718 | goto nla_put_failure; | |
2719 | ||
2720 | nfmsg = nlmsg_data(nlh); | |
36596dad | 2721 | nfmsg->nfgen_family = ctx->family; |
20a69341 | 2722 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 2723 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
20a69341 PM |
2724 | |
2725 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2726 | goto nla_put_failure; | |
2727 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2728 | goto nla_put_failure; | |
3ecbfd65 HS |
2729 | if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle), |
2730 | NFTA_SET_PAD)) | |
2731 | goto nla_put_failure; | |
20a69341 PM |
2732 | if (set->flags != 0) |
2733 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2734 | goto nla_put_failure; | |
2735 | ||
2736 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2737 | goto nla_put_failure; | |
2738 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2739 | goto nla_put_failure; | |
2740 | if (set->flags & NFT_SET_MAP) { | |
2741 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2742 | goto nla_put_failure; | |
2743 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2744 | goto nla_put_failure; | |
2745 | } | |
8aeff920 PNA |
2746 | if (set->flags & NFT_SET_OBJECT && |
2747 | nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) | |
2748 | goto nla_put_failure; | |
20a69341 | 2749 | |
761da293 | 2750 | if (set->timeout && |
d3e2a111 AP |
2751 | nla_put_be64(skb, NFTA_SET_TIMEOUT, |
2752 | cpu_to_be64(jiffies_to_msecs(set->timeout)), | |
b46f6ded | 2753 | NFTA_SET_PAD)) |
761da293 PM |
2754 | goto nla_put_failure; |
2755 | if (set->gc_int && | |
2756 | nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) | |
2757 | goto nla_put_failure; | |
2758 | ||
9363dc4b AB |
2759 | if (set->policy != NFT_SET_POL_PERFORMANCE) { |
2760 | if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) | |
2761 | goto nla_put_failure; | |
2762 | } | |
2763 | ||
e6d8ecac CFG |
2764 | if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) |
2765 | goto nla_put_failure; | |
2766 | ||
c50b960c PM |
2767 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
2768 | if (desc == NULL) | |
2769 | goto nla_put_failure; | |
2770 | if (set->size && | |
2771 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
2772 | goto nla_put_failure; | |
2773 | nla_nest_end(skb, desc); | |
2774 | ||
053c095a JB |
2775 | nlmsg_end(skb, nlh); |
2776 | return 0; | |
20a69341 PM |
2777 | |
2778 | nla_put_failure: | |
2779 | nlmsg_trim(skb, nlh); | |
2780 | return -1; | |
2781 | } | |
2782 | ||
25e94a99 PNA |
2783 | static void nf_tables_set_notify(const struct nft_ctx *ctx, |
2784 | const struct nft_set *set, int event, | |
2785 | gfp_t gfp_flags) | |
20a69341 PM |
2786 | { |
2787 | struct sk_buff *skb; | |
128ad332 | 2788 | u32 portid = ctx->portid; |
20a69341 PM |
2789 | int err; |
2790 | ||
128ad332 PNA |
2791 | if (!ctx->report && |
2792 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
25e94a99 | 2793 | return; |
20a69341 | 2794 | |
31f8441c | 2795 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
2796 | if (skb == NULL) |
2797 | goto err; | |
2798 | ||
2799 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2800 | if (err < 0) { | |
2801 | kfree_skb(skb); | |
2802 | goto err; | |
2803 | } | |
2804 | ||
25e94a99 PNA |
2805 | nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report, |
2806 | gfp_flags); | |
2807 | return; | |
20a69341 | 2808 | err: |
25e94a99 | 2809 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
20a69341 PM |
2810 | } |
2811 | ||
5b96af77 | 2812 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
c9c8e485 PNA |
2813 | { |
2814 | const struct nft_set *set; | |
2815 | unsigned int idx, s_idx = cb->args[0]; | |
c9c8e485 PNA |
2816 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2817 | struct net *net = sock_net(skb->sk); | |
5b96af77 | 2818 | struct nft_ctx *ctx = cb->data, ctx_set; |
c9c8e485 PNA |
2819 | |
2820 | if (cb->args[1]) | |
2821 | return skb->len; | |
2822 | ||
e688a7f8 | 2823 | rcu_read_lock(); |
38e029f1 PNA |
2824 | cb->seq = net->nft.base_seq; |
2825 | ||
36596dad PNA |
2826 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
2827 | if (ctx->family != NFPROTO_UNSPEC && | |
98319cb9 | 2828 | ctx->family != table->family) |
36596dad PNA |
2829 | continue; |
2830 | ||
2831 | if (ctx->table && ctx->table != table) | |
5b96af77 PNA |
2832 | continue; |
2833 | ||
36596dad PNA |
2834 | if (cur_table) { |
2835 | if (cur_table != table) | |
c9c8e485 PNA |
2836 | continue; |
2837 | ||
36596dad | 2838 | cur_table = NULL; |
c9c8e485 | 2839 | } |
36596dad PNA |
2840 | idx = 0; |
2841 | list_for_each_entry_rcu(set, &table->sets, list) { | |
2842 | if (idx < s_idx) | |
2843 | goto cont; | |
2844 | if (!nft_is_active(net, set)) | |
2845 | goto cont; | |
5b96af77 | 2846 | |
36596dad PNA |
2847 | ctx_set = *ctx; |
2848 | ctx_set.table = table; | |
98319cb9 | 2849 | ctx_set.family = table->family; |
c9c8e485 | 2850 | |
36596dad PNA |
2851 | if (nf_tables_fill_set(skb, &ctx_set, set, |
2852 | NFT_MSG_NEWSET, | |
2853 | NLM_F_MULTI) < 0) { | |
2854 | cb->args[0] = idx; | |
2855 | cb->args[2] = (unsigned long) table; | |
2856 | goto done; | |
c9c8e485 | 2857 | } |
36596dad | 2858 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 | 2859 | cont: |
36596dad | 2860 | idx++; |
c9c8e485 | 2861 | } |
36596dad PNA |
2862 | if (s_idx) |
2863 | s_idx = 0; | |
c9c8e485 PNA |
2864 | } |
2865 | cb->args[1] = 1; | |
2866 | done: | |
e688a7f8 | 2867 | rcu_read_unlock(); |
c9c8e485 PNA |
2868 | return skb->len; |
2869 | } | |
2870 | ||
5b96af77 | 2871 | static int nf_tables_dump_sets_done(struct netlink_callback *cb) |
20a69341 | 2872 | { |
5b96af77 PNA |
2873 | kfree(cb->data); |
2874 | return 0; | |
20a69341 PM |
2875 | } |
2876 | ||
7b8002a1 PNA |
2877 | static int nf_tables_getset(struct net *net, struct sock *nlsk, |
2878 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2879 | const struct nlattr * const nla[], |
2880 | struct netlink_ext_ack *extack) | |
20a69341 | 2881 | { |
f2a6d766 | 2882 | u8 genmask = nft_genmask_cur(net); |
20a69341 PM |
2883 | const struct nft_set *set; |
2884 | struct nft_ctx ctx; | |
2885 | struct sk_buff *skb2; | |
c9c8e485 | 2886 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2887 | int err; |
2888 | ||
01cfa0a4 | 2889 | /* Verify existence before starting dump */ |
f2a6d766 | 2890 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
2891 | if (err < 0) |
2892 | return err; | |
2893 | ||
2894 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2895 | struct netlink_dump_control c = { | |
2896 | .dump = nf_tables_dump_sets, | |
5b96af77 | 2897 | .done = nf_tables_dump_sets_done, |
20a69341 | 2898 | }; |
5b96af77 PNA |
2899 | struct nft_ctx *ctx_dump; |
2900 | ||
2901 | ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL); | |
2902 | if (ctx_dump == NULL) | |
2903 | return -ENOMEM; | |
2904 | ||
2905 | *ctx_dump = ctx; | |
2906 | c.data = ctx_dump; | |
2907 | ||
20a69341 PM |
2908 | return netlink_dump_start(nlsk, skb, nlh, &c); |
2909 | } | |
2910 | ||
c9c8e485 PNA |
2911 | /* Only accept unspec with dump */ |
2912 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2913 | return -EAFNOSUPPORT; | |
eaa2bcd6 PT |
2914 | if (!nla[NFTA_SET_TABLE]) |
2915 | return -EINVAL; | |
c9c8e485 | 2916 | |
37a9cc52 | 2917 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
2918 | if (IS_ERR(set)) |
2919 | return PTR_ERR(set); | |
2920 | ||
2921 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2922 | if (skb2 == NULL) | |
2923 | return -ENOMEM; | |
2924 | ||
2925 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2926 | if (err < 0) | |
2927 | goto err; | |
2928 | ||
2929 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2930 | ||
2931 | err: | |
2932 | kfree_skb(skb2); | |
2933 | return err; | |
2934 | } | |
2935 | ||
c50b960c PM |
2936 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
2937 | struct nft_set_desc *desc, | |
2938 | const struct nlattr *nla) | |
2939 | { | |
2940 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
2941 | int err; | |
2942 | ||
fceb6435 JB |
2943 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, |
2944 | nft_set_desc_policy, NULL); | |
c50b960c PM |
2945 | if (err < 0) |
2946 | return err; | |
2947 | ||
2948 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
2949 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
2950 | ||
2951 | return 0; | |
2952 | } | |
2953 | ||
633c9a84 PNA |
2954 | static int nf_tables_newset(struct net *net, struct sock *nlsk, |
2955 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2956 | const struct nlattr * const nla[], |
2957 | struct netlink_ext_ack *extack) | |
20a69341 PM |
2958 | { |
2959 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
f2a6d766 | 2960 | u8 genmask = nft_genmask_next(net); |
98319cb9 | 2961 | int family = nfmsg->nfgen_family; |
20a69341 | 2962 | const struct nft_set_ops *ops; |
20a69341 PM |
2963 | struct nft_table *table; |
2964 | struct nft_set *set; | |
2965 | struct nft_ctx ctx; | |
38745490 | 2966 | char *name; |
20a69341 PM |
2967 | unsigned int size; |
2968 | bool create; | |
761da293 | 2969 | u64 timeout; |
8aeff920 | 2970 | u32 ktype, dtype, flags, policy, gc_int, objtype; |
c50b960c | 2971 | struct nft_set_desc desc; |
e6d8ecac CFG |
2972 | unsigned char *udata; |
2973 | u16 udlen; | |
20a69341 PM |
2974 | int err; |
2975 | ||
2976 | if (nla[NFTA_SET_TABLE] == NULL || | |
2977 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
2978 | nla[NFTA_SET_KEY_LEN] == NULL || |
2979 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
2980 | return -EINVAL; |
2981 | ||
c50b960c PM |
2982 | memset(&desc, 0, sizeof(desc)); |
2983 | ||
20a69341 PM |
2984 | ktype = NFT_DATA_VALUE; |
2985 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
2986 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
2987 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
2988 | return -EINVAL; | |
2989 | } | |
2990 | ||
c50b960c | 2991 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
7d740264 | 2992 | if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
2993 | return -EINVAL; |
2994 | ||
2995 | flags = 0; | |
2996 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2997 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
2998 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
7c6c6e95 | 2999 | NFT_SET_INTERVAL | NFT_SET_TIMEOUT | |
8aeff920 PNA |
3000 | NFT_SET_MAP | NFT_SET_EVAL | |
3001 | NFT_SET_OBJECT)) | |
20a69341 | 3002 | return -EINVAL; |
8aeff920 PNA |
3003 | /* Only one of these operations is supported */ |
3004 | if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) == | |
3005 | (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) | |
7c6c6e95 | 3006 | return -EOPNOTSUPP; |
20a69341 PM |
3007 | } |
3008 | ||
3009 | dtype = 0; | |
20a69341 PM |
3010 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
3011 | if (!(flags & NFT_SET_MAP)) | |
3012 | return -EINVAL; | |
3013 | ||
3014 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
3015 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
3016 | dtype != NFT_DATA_VERDICT) | |
3017 | return -EINVAL; | |
3018 | ||
3019 | if (dtype != NFT_DATA_VERDICT) { | |
3020 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
3021 | return -EINVAL; | |
c50b960c | 3022 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
7d740264 | 3023 | if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) |
20a69341 PM |
3024 | return -EINVAL; |
3025 | } else | |
7d740264 | 3026 | desc.dlen = sizeof(struct nft_verdict); |
20a69341 PM |
3027 | } else if (flags & NFT_SET_MAP) |
3028 | return -EINVAL; | |
3029 | ||
8aeff920 PNA |
3030 | if (nla[NFTA_SET_OBJ_TYPE] != NULL) { |
3031 | if (!(flags & NFT_SET_OBJECT)) | |
3032 | return -EINVAL; | |
3033 | ||
3034 | objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); | |
3035 | if (objtype == NFT_OBJECT_UNSPEC || | |
3036 | objtype > NFT_OBJECT_MAX) | |
3037 | return -EINVAL; | |
3038 | } else if (flags & NFT_SET_OBJECT) | |
3039 | return -EINVAL; | |
3040 | else | |
3041 | objtype = NFT_OBJECT_UNSPEC; | |
3042 | ||
761da293 PM |
3043 | timeout = 0; |
3044 | if (nla[NFTA_SET_TIMEOUT] != NULL) { | |
3045 | if (!(flags & NFT_SET_TIMEOUT)) | |
3046 | return -EINVAL; | |
d3e2a111 AP |
3047 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3048 | nla[NFTA_SET_TIMEOUT]))); | |
761da293 PM |
3049 | } |
3050 | gc_int = 0; | |
3051 | if (nla[NFTA_SET_GC_INTERVAL] != NULL) { | |
3052 | if (!(flags & NFT_SET_TIMEOUT)) | |
3053 | return -EINVAL; | |
3054 | gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); | |
3055 | } | |
3056 | ||
c50b960c PM |
3057 | policy = NFT_SET_POL_PERFORMANCE; |
3058 | if (nla[NFTA_SET_POLICY] != NULL) | |
3059 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
3060 | ||
3061 | if (nla[NFTA_SET_DESC] != NULL) { | |
3062 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
3063 | if (err < 0) | |
3064 | return err; | |
3065 | } | |
3066 | ||
20a69341 PM |
3067 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
3068 | ||
98319cb9 | 3069 | table = nf_tables_table_lookup(net, nla[NFTA_SET_TABLE], family, |
36596dad | 3070 | genmask); |
20a69341 PM |
3071 | if (IS_ERR(table)) |
3072 | return PTR_ERR(table); | |
3073 | ||
98319cb9 | 3074 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 | 3075 | |
37a9cc52 | 3076 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask); |
20a69341 PM |
3077 | if (IS_ERR(set)) { |
3078 | if (PTR_ERR(set) != -ENOENT) | |
3079 | return PTR_ERR(set); | |
1a28ad74 | 3080 | } else { |
20a69341 PM |
3081 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
3082 | return -EEXIST; | |
3083 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
3084 | return -EOPNOTSUPP; | |
3085 | return 0; | |
3086 | } | |
3087 | ||
3088 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
3089 | return -ENOENT; | |
3090 | ||
2b664957 | 3091 | ops = nft_select_set_ops(&ctx, nla, &desc, policy); |
20a69341 PM |
3092 | if (IS_ERR(ops)) |
3093 | return PTR_ERR(ops); | |
3094 | ||
e6d8ecac CFG |
3095 | udlen = 0; |
3096 | if (nla[NFTA_SET_USERDATA]) | |
3097 | udlen = nla_len(nla[NFTA_SET_USERDATA]); | |
3098 | ||
20a69341 PM |
3099 | size = 0; |
3100 | if (ops->privsize != NULL) | |
347b408d | 3101 | size = ops->privsize(nla, &desc); |
20a69341 | 3102 | |
1ff75a3e PNA |
3103 | set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); |
3104 | if (!set) { | |
3105 | err = -ENOMEM; | |
20a69341 | 3106 | goto err1; |
1ff75a3e | 3107 | } |
20a69341 | 3108 | |
38745490 PS |
3109 | name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL); |
3110 | if (!name) { | |
3111 | err = -ENOMEM; | |
3112 | goto err2; | |
3113 | } | |
3114 | ||
20a69341 | 3115 | err = nf_tables_set_alloc_name(&ctx, set, name); |
38745490 | 3116 | kfree(name); |
20a69341 PM |
3117 | if (err < 0) |
3118 | goto err2; | |
3119 | ||
e6d8ecac CFG |
3120 | udata = NULL; |
3121 | if (udlen) { | |
3122 | udata = set->data + size; | |
3123 | nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); | |
3124 | } | |
3125 | ||
20a69341 PM |
3126 | INIT_LIST_HEAD(&set->bindings); |
3127 | set->ops = ops; | |
3128 | set->ktype = ktype; | |
c50b960c | 3129 | set->klen = desc.klen; |
20a69341 | 3130 | set->dtype = dtype; |
8aeff920 | 3131 | set->objtype = objtype; |
c50b960c | 3132 | set->dlen = desc.dlen; |
20a69341 | 3133 | set->flags = flags; |
c50b960c | 3134 | set->size = desc.size; |
9363dc4b | 3135 | set->policy = policy; |
e6d8ecac CFG |
3136 | set->udlen = udlen; |
3137 | set->udata = udata; | |
761da293 PM |
3138 | set->timeout = timeout; |
3139 | set->gc_int = gc_int; | |
3ecbfd65 | 3140 | set->handle = nf_tables_alloc_handle(table); |
20a69341 | 3141 | |
c50b960c | 3142 | err = ops->init(set, &desc, nla); |
20a69341 PM |
3143 | if (err < 0) |
3144 | goto err2; | |
3145 | ||
958bee14 | 3146 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 | 3147 | if (err < 0) |
c17c3cdf | 3148 | goto err3; |
20a69341 | 3149 | |
e688a7f8 | 3150 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 3151 | table->use++; |
20a69341 PM |
3152 | return 0; |
3153 | ||
c17c3cdf LZ |
3154 | err3: |
3155 | ops->destroy(set); | |
20a69341 | 3156 | err2: |
1ff75a3e | 3157 | kvfree(set); |
20a69341 | 3158 | err1: |
2b664957 | 3159 | module_put(ops->type->owner); |
20a69341 PM |
3160 | return err; |
3161 | } | |
3162 | ||
958bee14 | 3163 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 3164 | { |
20a69341 | 3165 | set->ops->destroy(set); |
2b664957 | 3166 | module_put(set->ops->type->owner); |
38745490 | 3167 | kfree(set->name); |
1ff75a3e | 3168 | kvfree(set); |
20a69341 PM |
3169 | } |
3170 | ||
958bee14 PNA |
3171 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
3172 | { | |
e688a7f8 | 3173 | list_del_rcu(&set->list); |
31f8441c | 3174 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
3175 | nft_set_destroy(set); |
3176 | } | |
3177 | ||
633c9a84 PNA |
3178 | static int nf_tables_delset(struct net *net, struct sock *nlsk, |
3179 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
3180 | const struct nlattr * const nla[], |
3181 | struct netlink_ext_ack *extack) | |
20a69341 | 3182 | { |
c9c8e485 | 3183 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
f2a6d766 | 3184 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
3185 | struct nft_set *set; |
3186 | struct nft_ctx ctx; | |
3187 | int err; | |
3188 | ||
ec2c9935 PM |
3189 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
3190 | return -EAFNOSUPPORT; | |
20a69341 PM |
3191 | if (nla[NFTA_SET_TABLE] == NULL) |
3192 | return -EINVAL; | |
3193 | ||
f2a6d766 | 3194 | err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
3195 | if (err < 0) |
3196 | return err; | |
3197 | ||
3ecbfd65 HS |
3198 | if (nla[NFTA_SET_HANDLE]) |
3199 | set = nf_tables_set_lookup_byhandle(ctx.table, nla[NFTA_SET_HANDLE], genmask); | |
3200 | else | |
3201 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask); | |
20a69341 PM |
3202 | if (IS_ERR(set)) |
3203 | return PTR_ERR(set); | |
a8278400 PNA |
3204 | |
3205 | if (!list_empty(&set->bindings) || | |
3206 | (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) | |
20a69341 PM |
3207 | return -EBUSY; |
3208 | ||
ee01d542 | 3209 | return nft_delset(&ctx, set); |
20a69341 PM |
3210 | } |
3211 | ||
3212 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 3213 | struct nft_set *set, |
20a69341 | 3214 | const struct nft_set_iter *iter, |
de70185d | 3215 | struct nft_set_elem *elem) |
20a69341 | 3216 | { |
fe2811eb | 3217 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3218 | enum nft_registers dreg; |
3219 | ||
3220 | dreg = nft_type_to_reg(set->dtype); | |
1ec10212 PM |
3221 | return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), |
3222 | set->dtype == NFT_DATA_VERDICT ? | |
3223 | NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
3224 | set->dlen); | |
20a69341 PM |
3225 | } |
3226 | ||
3227 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3228 | struct nft_set_binding *binding) | |
3229 | { | |
3230 | struct nft_set_binding *i; | |
3231 | struct nft_set_iter iter; | |
3232 | ||
408070d6 | 3233 | if (!list_empty(&set->bindings) && nft_set_is_anonymous(set)) |
20a69341 PM |
3234 | return -EBUSY; |
3235 | ||
11113e19 | 3236 | if (binding->flags & NFT_SET_MAP) { |
20a69341 PM |
3237 | /* If the set is already bound to the same chain all |
3238 | * jumps are already validated for that chain. | |
3239 | */ | |
3240 | list_for_each_entry(i, &set->bindings, list) { | |
a4684402 | 3241 | if (i->flags & NFT_SET_MAP && |
11113e19 | 3242 | i->chain == binding->chain) |
20a69341 PM |
3243 | goto bind; |
3244 | } | |
3245 | ||
8588ac09 | 3246 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
3247 | iter.skip = 0; |
3248 | iter.count = 0; | |
3249 | iter.err = 0; | |
3250 | iter.fn = nf_tables_bind_check_setelem; | |
3251 | ||
3252 | set->ops->walk(ctx, set, &iter); | |
a02f4248 | 3253 | if (iter.err < 0) |
20a69341 | 3254 | return iter.err; |
20a69341 PM |
3255 | } |
3256 | bind: | |
3257 | binding->chain = ctx->chain; | |
e688a7f8 | 3258 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
3259 | return 0; |
3260 | } | |
63aea290 | 3261 | EXPORT_SYMBOL_GPL(nf_tables_bind_set); |
20a69341 PM |
3262 | |
3263 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
3264 | struct nft_set_binding *binding) | |
3265 | { | |
e688a7f8 | 3266 | list_del_rcu(&binding->list); |
20a69341 | 3267 | |
408070d6 | 3268 | if (list_empty(&set->bindings) && nft_set_is_anonymous(set) && |
37a9cc52 | 3269 | nft_is_active(ctx->net, set)) |
20a69341 PM |
3270 | nf_tables_set_destroy(ctx, set); |
3271 | } | |
63aea290 | 3272 | EXPORT_SYMBOL_GPL(nf_tables_unbind_set); |
20a69341 | 3273 | |
3ac4c07a PM |
3274 | const struct nft_set_ext_type nft_set_ext_types[] = { |
3275 | [NFT_SET_EXT_KEY] = { | |
7d740264 | 3276 | .align = __alignof__(u32), |
3ac4c07a PM |
3277 | }, |
3278 | [NFT_SET_EXT_DATA] = { | |
7d740264 | 3279 | .align = __alignof__(u32), |
3ac4c07a | 3280 | }, |
f25ad2e9 PM |
3281 | [NFT_SET_EXT_EXPR] = { |
3282 | .align = __alignof__(struct nft_expr), | |
3283 | }, | |
8aeff920 PNA |
3284 | [NFT_SET_EXT_OBJREF] = { |
3285 | .len = sizeof(struct nft_object *), | |
3286 | .align = __alignof__(struct nft_object *), | |
3287 | }, | |
3ac4c07a PM |
3288 | [NFT_SET_EXT_FLAGS] = { |
3289 | .len = sizeof(u8), | |
3290 | .align = __alignof__(u8), | |
3291 | }, | |
c3e1b005 PM |
3292 | [NFT_SET_EXT_TIMEOUT] = { |
3293 | .len = sizeof(u64), | |
3294 | .align = __alignof__(u64), | |
3295 | }, | |
3296 | [NFT_SET_EXT_EXPIRATION] = { | |
3297 | .len = sizeof(unsigned long), | |
3298 | .align = __alignof__(unsigned long), | |
3299 | }, | |
68e942e8 PM |
3300 | [NFT_SET_EXT_USERDATA] = { |
3301 | .len = sizeof(struct nft_userdata), | |
3302 | .align = __alignof__(struct nft_userdata), | |
3303 | }, | |
3ac4c07a PM |
3304 | }; |
3305 | EXPORT_SYMBOL_GPL(nft_set_ext_types); | |
3306 | ||
20a69341 PM |
3307 | /* |
3308 | * Set elements | |
3309 | */ | |
3310 | ||
3311 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
3312 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
3313 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
3314 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
c3e1b005 | 3315 | [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, |
68e942e8 PM |
3316 | [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, |
3317 | .len = NFT_USERDATA_MAXLEN }, | |
20a69341 PM |
3318 | }; |
3319 | ||
3320 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
b2fbd044 LZ |
3321 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, |
3322 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
3323 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, | |
3324 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
20a69341 | 3325 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
958bee14 | 3326 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
3327 | }; |
3328 | ||
633c9a84 | 3329 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net, |
20a69341 PM |
3330 | const struct sk_buff *skb, |
3331 | const struct nlmsghdr *nlh, | |
f2a6d766 PNA |
3332 | const struct nlattr * const nla[], |
3333 | u8 genmask) | |
20a69341 PM |
3334 | { |
3335 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
98319cb9 | 3336 | int family = nfmsg->nfgen_family; |
7c95f6d8 | 3337 | struct nft_table *table; |
20a69341 | 3338 | |
36596dad | 3339 | table = nf_tables_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], |
98319cb9 | 3340 | family, genmask); |
20a69341 PM |
3341 | if (IS_ERR(table)) |
3342 | return PTR_ERR(table); | |
3343 | ||
98319cb9 | 3344 | nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla); |
20a69341 PM |
3345 | return 0; |
3346 | } | |
3347 | ||
3348 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
3349 | const struct nft_set *set, | |
3350 | const struct nft_set_elem *elem) | |
3351 | { | |
fe2811eb | 3352 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
20a69341 PM |
3353 | unsigned char *b = skb_tail_pointer(skb); |
3354 | struct nlattr *nest; | |
3355 | ||
3356 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
3357 | if (nest == NULL) | |
3358 | goto nla_put_failure; | |
3359 | ||
fe2811eb PM |
3360 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), |
3361 | NFT_DATA_VALUE, set->klen) < 0) | |
20a69341 PM |
3362 | goto nla_put_failure; |
3363 | ||
fe2811eb PM |
3364 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3365 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), | |
20a69341 PM |
3366 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
3367 | set->dlen) < 0) | |
3368 | goto nla_put_failure; | |
3369 | ||
f25ad2e9 PM |
3370 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) && |
3371 | nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0) | |
3372 | goto nla_put_failure; | |
3373 | ||
8aeff920 PNA |
3374 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && |
3375 | nla_put_string(skb, NFTA_SET_ELEM_OBJREF, | |
3376 | (*nft_set_ext_obj(ext))->name) < 0) | |
3377 | goto nla_put_failure; | |
3378 | ||
fe2811eb PM |
3379 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && |
3380 | nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, | |
3381 | htonl(*nft_set_ext_flags(ext)))) | |
3382 | goto nla_put_failure; | |
20a69341 | 3383 | |
c3e1b005 PM |
3384 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && |
3385 | nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, | |
d3e2a111 AP |
3386 | cpu_to_be64(jiffies_to_msecs( |
3387 | *nft_set_ext_timeout(ext))), | |
b46f6ded | 3388 | NFTA_SET_ELEM_PAD)) |
c3e1b005 PM |
3389 | goto nla_put_failure; |
3390 | ||
3391 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
3392 | unsigned long expires, now = jiffies; | |
3393 | ||
3394 | expires = *nft_set_ext_expiration(ext); | |
3395 | if (time_before(now, expires)) | |
3396 | expires -= now; | |
3397 | else | |
3398 | expires = 0; | |
3399 | ||
3400 | if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, | |
b46f6ded ND |
3401 | cpu_to_be64(jiffies_to_msecs(expires)), |
3402 | NFTA_SET_ELEM_PAD)) | |
c3e1b005 PM |
3403 | goto nla_put_failure; |
3404 | } | |
3405 | ||
68e942e8 PM |
3406 | if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { |
3407 | struct nft_userdata *udata; | |
3408 | ||
3409 | udata = nft_set_ext_userdata(ext); | |
3410 | if (nla_put(skb, NFTA_SET_ELEM_USERDATA, | |
3411 | udata->len + 1, udata->data)) | |
3412 | goto nla_put_failure; | |
3413 | } | |
3414 | ||
20a69341 PM |
3415 | nla_nest_end(skb, nest); |
3416 | return 0; | |
3417 | ||
3418 | nla_put_failure: | |
3419 | nlmsg_trim(skb, b); | |
3420 | return -EMSGSIZE; | |
3421 | } | |
3422 | ||
3423 | struct nft_set_dump_args { | |
3424 | const struct netlink_callback *cb; | |
3425 | struct nft_set_iter iter; | |
3426 | struct sk_buff *skb; | |
3427 | }; | |
3428 | ||
3429 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
de70185d | 3430 | struct nft_set *set, |
20a69341 | 3431 | const struct nft_set_iter *iter, |
de70185d | 3432 | struct nft_set_elem *elem) |
20a69341 PM |
3433 | { |
3434 | struct nft_set_dump_args *args; | |
3435 | ||
3436 | args = container_of(iter, struct nft_set_dump_args, iter); | |
3437 | return nf_tables_fill_setelem(args->skb, set, elem); | |
3438 | } | |
3439 | ||
fa803605 LZ |
3440 | struct nft_set_dump_ctx { |
3441 | const struct nft_set *set; | |
3442 | struct nft_ctx ctx; | |
3443 | }; | |
3444 | ||
20a69341 PM |
3445 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
3446 | { | |
fa803605 | 3447 | struct nft_set_dump_ctx *dump_ctx = cb->data; |
633c9a84 | 3448 | struct net *net = sock_net(skb->sk); |
fa803605 | 3449 | struct nft_table *table; |
de70185d | 3450 | struct nft_set *set; |
20a69341 | 3451 | struct nft_set_dump_args args; |
fa803605 | 3452 | bool set_found = false; |
20a69341 PM |
3453 | struct nfgenmsg *nfmsg; |
3454 | struct nlmsghdr *nlh; | |
3455 | struct nlattr *nest; | |
3456 | u32 portid, seq; | |
fa803605 | 3457 | int event; |
20a69341 | 3458 | |
fa803605 | 3459 | rcu_read_lock(); |
36596dad PNA |
3460 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
3461 | if (dump_ctx->ctx.family != NFPROTO_UNSPEC && | |
98319cb9 | 3462 | dump_ctx->ctx.family != table->family) |
fa803605 | 3463 | continue; |
20a69341 | 3464 | |
36596dad PNA |
3465 | if (table != dump_ctx->ctx.table) |
3466 | continue; | |
20a69341 | 3467 | |
36596dad PNA |
3468 | list_for_each_entry_rcu(set, &table->sets, list) { |
3469 | if (set == dump_ctx->set) { | |
3470 | set_found = true; | |
3471 | break; | |
fa803605 | 3472 | } |
fa803605 LZ |
3473 | } |
3474 | break; | |
3475 | } | |
3476 | ||
3477 | if (!set_found) { | |
3478 | rcu_read_unlock(); | |
3479 | return -ENOENT; | |
3480 | } | |
20a69341 | 3481 | |
dedb67c4 | 3482 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); |
20a69341 PM |
3483 | portid = NETLINK_CB(cb->skb).portid; |
3484 | seq = cb->nlh->nlmsg_seq; | |
3485 | ||
3486 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
3487 | NLM_F_MULTI); | |
3488 | if (nlh == NULL) | |
3489 | goto nla_put_failure; | |
3490 | ||
3491 | nfmsg = nlmsg_data(nlh); | |
98319cb9 | 3492 | nfmsg->nfgen_family = table->family; |
20a69341 | 3493 | nfmsg->version = NFNETLINK_V0; |
fa803605 | 3494 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); |
20a69341 | 3495 | |
fa803605 | 3496 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) |
20a69341 PM |
3497 | goto nla_put_failure; |
3498 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
3499 | goto nla_put_failure; | |
3500 | ||
3501 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3502 | if (nest == NULL) | |
3503 | goto nla_put_failure; | |
3504 | ||
8588ac09 PNA |
3505 | args.cb = cb; |
3506 | args.skb = skb; | |
fa803605 | 3507 | args.iter.genmask = nft_genmask_cur(net); |
8588ac09 PNA |
3508 | args.iter.skip = cb->args[0]; |
3509 | args.iter.count = 0; | |
3510 | args.iter.err = 0; | |
3511 | args.iter.fn = nf_tables_dump_setelem; | |
fa803605 LZ |
3512 | set->ops->walk(&dump_ctx->ctx, set, &args.iter); |
3513 | rcu_read_unlock(); | |
20a69341 PM |
3514 | |
3515 | nla_nest_end(skb, nest); | |
3516 | nlmsg_end(skb, nlh); | |
3517 | ||
3518 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
3519 | return args.iter.err; | |
3520 | if (args.iter.count == cb->args[0]) | |
3521 | return 0; | |
3522 | ||
3523 | cb->args[0] = args.iter.count; | |
3524 | return skb->len; | |
3525 | ||
3526 | nla_put_failure: | |
fa803605 | 3527 | rcu_read_unlock(); |
20a69341 PM |
3528 | return -ENOSPC; |
3529 | } | |
3530 | ||
fa803605 LZ |
3531 | static int nf_tables_dump_set_done(struct netlink_callback *cb) |
3532 | { | |
3533 | kfree(cb->data); | |
3534 | return 0; | |
3535 | } | |
3536 | ||
d60ce62f AB |
3537 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
3538 | const struct nft_ctx *ctx, u32 seq, | |
3539 | u32 portid, int event, u16 flags, | |
3540 | const struct nft_set *set, | |
3541 | const struct nft_set_elem *elem) | |
3542 | { | |
3543 | struct nfgenmsg *nfmsg; | |
3544 | struct nlmsghdr *nlh; | |
3545 | struct nlattr *nest; | |
3546 | int err; | |
3547 | ||
dedb67c4 | 3548 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
d60ce62f AB |
3549 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
3550 | flags); | |
3551 | if (nlh == NULL) | |
3552 | goto nla_put_failure; | |
3553 | ||
3554 | nfmsg = nlmsg_data(nlh); | |
36596dad | 3555 | nfmsg->nfgen_family = ctx->family; |
d60ce62f | 3556 | nfmsg->version = NFNETLINK_V0; |
84d7fce6 | 3557 | nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff); |
d60ce62f AB |
3558 | |
3559 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
3560 | goto nla_put_failure; | |
3561 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
3562 | goto nla_put_failure; | |
3563 | ||
3564 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
3565 | if (nest == NULL) | |
3566 | goto nla_put_failure; | |
3567 | ||
3568 | err = nf_tables_fill_setelem(skb, set, elem); | |
3569 | if (err < 0) | |
3570 | goto nla_put_failure; | |
3571 | ||
3572 | nla_nest_end(skb, nest); | |
3573 | ||
053c095a JB |
3574 | nlmsg_end(skb, nlh); |
3575 | return 0; | |
d60ce62f AB |
3576 | |
3577 | nla_put_failure: | |
3578 | nlmsg_trim(skb, nlh); | |
3579 | return -1; | |
3580 | } | |
3581 | ||
ba0e4d99 PNA |
3582 | static int nft_setelem_parse_flags(const struct nft_set *set, |
3583 | const struct nlattr *attr, u32 *flags) | |
3584 | { | |
3585 | if (attr == NULL) | |
3586 | return 0; | |
3587 | ||
3588 | *flags = ntohl(nla_get_be32(attr)); | |
3589 | if (*flags & ~NFT_SET_ELEM_INTERVAL_END) | |
3590 | return -EINVAL; | |
3591 | if (!(set->flags & NFT_SET_INTERVAL) && | |
3592 | *flags & NFT_SET_ELEM_INTERVAL_END) | |
3593 | return -EINVAL; | |
3594 | ||
3595 | return 0; | |
3596 | } | |
3597 | ||
3598 | static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set, | |
3599 | const struct nlattr *attr) | |
3600 | { | |
3601 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3602 | const struct nft_set_ext *ext; | |
3603 | struct nft_data_desc desc; | |
3604 | struct nft_set_elem elem; | |
3605 | struct sk_buff *skb; | |
3606 | uint32_t flags = 0; | |
3607 | void *priv; | |
3608 | int err; | |
3609 | ||
3610 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3611 | nft_set_elem_policy, NULL); | |
3612 | if (err < 0) | |
3613 | return err; | |
3614 | ||
3615 | if (!nla[NFTA_SET_ELEM_KEY]) | |
3616 | return -EINVAL; | |
3617 | ||
3618 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
3619 | if (err < 0) | |
3620 | return err; | |
3621 | ||
3622 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, | |
3623 | nla[NFTA_SET_ELEM_KEY]); | |
3624 | if (err < 0) | |
3625 | return err; | |
3626 | ||
3627 | err = -EINVAL; | |
3628 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
3629 | return err; | |
3630 | ||
3631 | priv = set->ops->get(ctx->net, set, &elem, flags); | |
3632 | if (IS_ERR(priv)) | |
3633 | return PTR_ERR(priv); | |
3634 | ||
3635 | elem.priv = priv; | |
3636 | ext = nft_set_elem_ext(set, &elem); | |
3637 | ||
3638 | err = -ENOMEM; | |
3639 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
3640 | if (skb == NULL) | |
3641 | goto err1; | |
3642 | ||
3643 | err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid, | |
3644 | NFT_MSG_NEWSETELEM, 0, set, &elem); | |
3645 | if (err < 0) | |
3646 | goto err2; | |
3647 | ||
3648 | err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT); | |
3649 | /* This avoids a loop in nfnetlink. */ | |
3650 | if (err < 0) | |
3651 | goto err1; | |
3652 | ||
3653 | return 0; | |
3654 | err2: | |
3655 | kfree_skb(skb); | |
3656 | err1: | |
3657 | /* this avoids a loop in nfnetlink. */ | |
3658 | return err == -EAGAIN ? -ENOBUFS : err; | |
3659 | } | |
3660 | ||
3661 | static int nf_tables_getsetelem(struct net *net, struct sock *nlsk, | |
3662 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
3663 | const struct nlattr * const nla[], | |
3664 | struct netlink_ext_ack *extack) | |
3665 | { | |
3666 | u8 genmask = nft_genmask_cur(net); | |
3667 | struct nft_set *set; | |
3668 | struct nlattr *attr; | |
3669 | struct nft_ctx ctx; | |
3670 | int rem, err = 0; | |
3671 | ||
3672 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); | |
3673 | if (err < 0) | |
3674 | return err; | |
3675 | ||
3676 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], | |
3677 | genmask); | |
3678 | if (IS_ERR(set)) | |
3679 | return PTR_ERR(set); | |
3680 | ||
3681 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
3682 | struct netlink_dump_control c = { | |
3683 | .dump = nf_tables_dump_set, | |
3684 | .done = nf_tables_dump_set_done, | |
3685 | }; | |
3686 | struct nft_set_dump_ctx *dump_ctx; | |
3687 | ||
3688 | dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL); | |
3689 | if (!dump_ctx) | |
3690 | return -ENOMEM; | |
3691 | ||
3692 | dump_ctx->set = set; | |
3693 | dump_ctx->ctx = ctx; | |
3694 | ||
3695 | c.data = dump_ctx; | |
3696 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
3697 | } | |
3698 | ||
3699 | if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) | |
3700 | return -EINVAL; | |
3701 | ||
3702 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3703 | err = nft_get_set_elem(&ctx, set, attr); | |
3704 | if (err < 0) | |
3705 | break; | |
3706 | } | |
3707 | ||
3708 | return err; | |
3709 | } | |
3710 | ||
25e94a99 PNA |
3711 | static void nf_tables_setelem_notify(const struct nft_ctx *ctx, |
3712 | const struct nft_set *set, | |
3713 | const struct nft_set_elem *elem, | |
3714 | int event, u16 flags) | |
d60ce62f | 3715 | { |
128ad332 PNA |
3716 | struct net *net = ctx->net; |
3717 | u32 portid = ctx->portid; | |
d60ce62f AB |
3718 | struct sk_buff *skb; |
3719 | int err; | |
3720 | ||
128ad332 | 3721 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
25e94a99 | 3722 | return; |
d60ce62f | 3723 | |
d60ce62f AB |
3724 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
3725 | if (skb == NULL) | |
3726 | goto err; | |
3727 | ||
3728 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
3729 | set, elem); | |
3730 | if (err < 0) { | |
3731 | kfree_skb(skb); | |
3732 | goto err; | |
3733 | } | |
3734 | ||
25e94a99 PNA |
3735 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
3736 | GFP_KERNEL); | |
3737 | return; | |
d60ce62f | 3738 | err: |
25e94a99 | 3739 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
d60ce62f AB |
3740 | } |
3741 | ||
60319eb1 PNA |
3742 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
3743 | int msg_type, | |
3744 | struct nft_set *set) | |
3745 | { | |
3746 | struct nft_trans *trans; | |
3747 | ||
3748 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
3749 | if (trans == NULL) | |
3750 | return NULL; | |
3751 | ||
3752 | nft_trans_elem_set(trans) = set; | |
3753 | return trans; | |
3754 | } | |
3755 | ||
22fe54d5 PM |
3756 | void *nft_set_elem_init(const struct nft_set *set, |
3757 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 3758 | const u32 *key, const u32 *data, |
22fe54d5 | 3759 | u64 timeout, gfp_t gfp) |
fe2811eb PM |
3760 | { |
3761 | struct nft_set_ext *ext; | |
3762 | void *elem; | |
3763 | ||
3764 | elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); | |
3765 | if (elem == NULL) | |
3766 | return NULL; | |
3767 | ||
3768 | ext = nft_set_elem_ext(set, elem); | |
3769 | nft_set_ext_init(ext, tmpl); | |
3770 | ||
3771 | memcpy(nft_set_ext_key(ext), key, set->klen); | |
3772 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
3773 | memcpy(nft_set_ext_data(ext), data, set->dlen); | |
c3e1b005 PM |
3774 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) |
3775 | *nft_set_ext_expiration(ext) = | |
d3e2a111 | 3776 | jiffies + timeout; |
c3e1b005 PM |
3777 | if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) |
3778 | *nft_set_ext_timeout(ext) = timeout; | |
fe2811eb PM |
3779 | |
3780 | return elem; | |
3781 | } | |
3782 | ||
61f9e292 LZ |
3783 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
3784 | bool destroy_expr) | |
61edafbb PM |
3785 | { |
3786 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3787 | ||
59105446 | 3788 | nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); |
61edafbb | 3789 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) |
59105446 | 3790 | nft_data_release(nft_set_ext_data(ext), set->dtype); |
61f9e292 | 3791 | if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) |
f25ad2e9 | 3792 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); |
8aeff920 PNA |
3793 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) |
3794 | (*nft_set_ext_obj(ext))->use--; | |
61edafbb PM |
3795 | kfree(elem); |
3796 | } | |
3797 | EXPORT_SYMBOL_GPL(nft_set_elem_destroy); | |
3798 | ||
59105446 PNA |
3799 | /* Only called from commit path, nft_set_elem_deactivate() already deals with |
3800 | * the refcounting from the preparation phase. | |
3801 | */ | |
3802 | static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem) | |
3803 | { | |
3804 | struct nft_set_ext *ext = nft_set_elem_ext(set, elem); | |
3805 | ||
3806 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) | |
3807 | nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext)); | |
3808 | kfree(elem); | |
3809 | } | |
3810 | ||
60319eb1 | 3811 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, |
c016c7e4 | 3812 | const struct nlattr *attr, u32 nlmsg_flags) |
20a69341 PM |
3813 | { |
3814 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
8aeff920 | 3815 | u8 genmask = nft_genmask_next(ctx->net); |
20a69341 | 3816 | struct nft_data_desc d1, d2; |
fe2811eb | 3817 | struct nft_set_ext_tmpl tmpl; |
c016c7e4 | 3818 | struct nft_set_ext *ext, *ext2; |
20a69341 PM |
3819 | struct nft_set_elem elem; |
3820 | struct nft_set_binding *binding; | |
8aeff920 | 3821 | struct nft_object *obj = NULL; |
68e942e8 | 3822 | struct nft_userdata *udata; |
fe2811eb | 3823 | struct nft_data data; |
20a69341 | 3824 | enum nft_registers dreg; |
60319eb1 | 3825 | struct nft_trans *trans; |
0e9091d6 | 3826 | u32 flags = 0; |
c3e1b005 | 3827 | u64 timeout; |
68e942e8 | 3828 | u8 ulen; |
20a69341 PM |
3829 | int err; |
3830 | ||
3831 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 3832 | nft_set_elem_policy, NULL); |
20a69341 PM |
3833 | if (err < 0) |
3834 | return err; | |
3835 | ||
3836 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3837 | return -EINVAL; | |
3838 | ||
fe2811eb PM |
3839 | nft_set_ext_prepare(&tmpl); |
3840 | ||
0e9091d6 PNA |
3841 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); |
3842 | if (err < 0) | |
3843 | return err; | |
3844 | if (flags != 0) | |
3845 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
20a69341 PM |
3846 | |
3847 | if (set->flags & NFT_SET_MAP) { | |
3848 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
fe2811eb | 3849 | !(flags & NFT_SET_ELEM_INTERVAL_END)) |
20a69341 | 3850 | return -EINVAL; |
bd7fc645 | 3851 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
fe2811eb | 3852 | flags & NFT_SET_ELEM_INTERVAL_END) |
bd7fc645 | 3853 | return -EINVAL; |
20a69341 PM |
3854 | } else { |
3855 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
3856 | return -EINVAL; | |
3857 | } | |
3858 | ||
c3e1b005 PM |
3859 | timeout = 0; |
3860 | if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { | |
3861 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
3862 | return -EINVAL; | |
d3e2a111 AP |
3863 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
3864 | nla[NFTA_SET_ELEM_TIMEOUT]))); | |
c3e1b005 PM |
3865 | } else if (set->flags & NFT_SET_TIMEOUT) { |
3866 | timeout = set->timeout; | |
3867 | } | |
3868 | ||
7d740264 | 3869 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1, |
d0a11fc3 | 3870 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
3871 | if (err < 0) |
3872 | goto err1; | |
3873 | err = -EINVAL; | |
3874 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
3875 | goto err2; | |
3876 | ||
7d740264 | 3877 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len); |
c3e1b005 PM |
3878 | if (timeout > 0) { |
3879 | nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); | |
3880 | if (timeout != set->timeout) | |
3881 | nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); | |
3882 | } | |
fe2811eb | 3883 | |
8aeff920 PNA |
3884 | if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { |
3885 | if (!(set->flags & NFT_SET_OBJECT)) { | |
3886 | err = -EINVAL; | |
3887 | goto err2; | |
3888 | } | |
3889 | obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF], | |
3890 | set->objtype, genmask); | |
3891 | if (IS_ERR(obj)) { | |
3892 | err = PTR_ERR(obj); | |
3893 | goto err2; | |
3894 | } | |
3895 | nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); | |
3896 | } | |
3897 | ||
20a69341 | 3898 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
d0a11fc3 PM |
3899 | err = nft_data_init(ctx, &data, sizeof(data), &d2, |
3900 | nla[NFTA_SET_ELEM_DATA]); | |
20a69341 PM |
3901 | if (err < 0) |
3902 | goto err2; | |
3903 | ||
3904 | err = -EINVAL; | |
3905 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
3906 | goto err3; | |
3907 | ||
3908 | dreg = nft_type_to_reg(set->dtype); | |
3909 | list_for_each_entry(binding, &set->bindings, list) { | |
3910 | struct nft_ctx bind_ctx = { | |
58c78e10 | 3911 | .net = ctx->net, |
36596dad | 3912 | .family = ctx->family, |
20a69341 | 3913 | .table = ctx->table, |
7c95f6d8 | 3914 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
3915 | }; |
3916 | ||
11113e19 PM |
3917 | if (!(binding->flags & NFT_SET_MAP)) |
3918 | continue; | |
3919 | ||
1ec10212 PM |
3920 | err = nft_validate_register_store(&bind_ctx, dreg, |
3921 | &data, | |
3922 | d2.type, d2.len); | |
20a69341 PM |
3923 | if (err < 0) |
3924 | goto err3; | |
3925 | } | |
fe2811eb | 3926 | |
7d740264 | 3927 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len); |
20a69341 PM |
3928 | } |
3929 | ||
68e942e8 PM |
3930 | /* The full maximum length of userdata can exceed the maximum |
3931 | * offset value (U8_MAX) for following extensions, therefor it | |
3932 | * must be the last extension added. | |
3933 | */ | |
3934 | ulen = 0; | |
3935 | if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { | |
3936 | ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); | |
3937 | if (ulen > 0) | |
3938 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, | |
3939 | ulen); | |
3940 | } | |
3941 | ||
fe2811eb | 3942 | err = -ENOMEM; |
7d740264 | 3943 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data, |
c3e1b005 | 3944 | timeout, GFP_KERNEL); |
fe2811eb PM |
3945 | if (elem.priv == NULL) |
3946 | goto err3; | |
3947 | ||
3948 | ext = nft_set_elem_ext(set, elem.priv); | |
3949 | if (flags) | |
3950 | *nft_set_ext_flags(ext) = flags; | |
68e942e8 PM |
3951 | if (ulen > 0) { |
3952 | udata = nft_set_ext_userdata(ext); | |
3953 | udata->len = ulen - 1; | |
3954 | nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); | |
3955 | } | |
8aeff920 PNA |
3956 | if (obj) { |
3957 | *nft_set_ext_obj(ext) = obj; | |
3958 | obj->use++; | |
3959 | } | |
fe2811eb | 3960 | |
60319eb1 PNA |
3961 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
3962 | if (trans == NULL) | |
fe2811eb | 3963 | goto err4; |
60319eb1 | 3964 | |
69086658 | 3965 | ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; |
c016c7e4 PNA |
3966 | err = set->ops->insert(ctx->net, set, &elem, &ext2); |
3967 | if (err) { | |
3968 | if (err == -EEXIST) { | |
9744a6fc PNA |
3969 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ |
3970 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || | |
3971 | nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ | |
3972 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) | |
3973 | return -EBUSY; | |
8aeff920 PNA |
3974 | if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && |
3975 | nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && | |
3976 | memcmp(nft_set_ext_data(ext), | |
3977 | nft_set_ext_data(ext2), set->dlen) != 0) || | |
3978 | (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && | |
3979 | nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && | |
3980 | *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) | |
c016c7e4 PNA |
3981 | err = -EBUSY; |
3982 | else if (!(nlmsg_flags & NLM_F_EXCL)) | |
3983 | err = 0; | |
3984 | } | |
fe2811eb | 3985 | goto err5; |
c016c7e4 | 3986 | } |
20a69341 | 3987 | |
35d0ac90 PNA |
3988 | if (set->size && |
3989 | !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { | |
3990 | err = -ENFILE; | |
3991 | goto err6; | |
3992 | } | |
3993 | ||
60319eb1 | 3994 | nft_trans_elem(trans) = elem; |
46bbafce | 3995 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
3996 | return 0; |
3997 | ||
35d0ac90 | 3998 | err6: |
5cb82a38 | 3999 | set->ops->remove(ctx->net, set, &elem); |
fe2811eb | 4000 | err5: |
60319eb1 | 4001 | kfree(trans); |
fe2811eb PM |
4002 | err4: |
4003 | kfree(elem.priv); | |
20a69341 PM |
4004 | err3: |
4005 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
59105446 | 4006 | nft_data_release(&data, d2.type); |
20a69341 | 4007 | err2: |
59105446 | 4008 | nft_data_release(&elem.key.val, d1.type); |
20a69341 PM |
4009 | err1: |
4010 | return err; | |
4011 | } | |
4012 | ||
633c9a84 PNA |
4013 | static int nf_tables_newsetelem(struct net *net, struct sock *nlsk, |
4014 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4015 | const struct nlattr * const nla[], |
4016 | struct netlink_ext_ack *extack) | |
20a69341 | 4017 | { |
f2a6d766 | 4018 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4019 | const struct nlattr *attr; |
4020 | struct nft_set *set; | |
4021 | struct nft_ctx ctx; | |
60319eb1 | 4022 | int rem, err = 0; |
20a69341 | 4023 | |
7d5570ca PNA |
4024 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) |
4025 | return -EINVAL; | |
4026 | ||
f2a6d766 | 4027 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
4028 | if (err < 0) |
4029 | return err; | |
4030 | ||
37a9cc52 PNA |
4031 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
4032 | genmask); | |
958bee14 PNA |
4033 | if (IS_ERR(set)) { |
4034 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { | |
4035 | set = nf_tables_set_lookup_byid(net, | |
37a9cc52 PNA |
4036 | nla[NFTA_SET_ELEM_LIST_SET_ID], |
4037 | genmask); | |
958bee14 PNA |
4038 | } |
4039 | if (IS_ERR(set)) | |
4040 | return PTR_ERR(set); | |
4041 | } | |
4042 | ||
20a69341 PM |
4043 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
4044 | return -EBUSY; | |
4045 | ||
4046 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
c016c7e4 | 4047 | err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags); |
35d0ac90 | 4048 | if (err < 0) |
60319eb1 | 4049 | break; |
20a69341 | 4050 | } |
60319eb1 | 4051 | return err; |
20a69341 PM |
4052 | } |
4053 | ||
59105446 PNA |
4054 | /** |
4055 | * nft_data_hold - hold a nft_data item | |
4056 | * | |
4057 | * @data: struct nft_data to release | |
4058 | * @type: type of data | |
4059 | * | |
4060 | * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
4061 | * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and | |
4062 | * NFT_GOTO verdicts. This function must be called on active data objects | |
4063 | * from the second phase of the commit protocol. | |
4064 | */ | |
4065 | static void nft_data_hold(const struct nft_data *data, enum nft_data_types type) | |
4066 | { | |
4067 | if (type == NFT_DATA_VERDICT) { | |
4068 | switch (data->verdict.code) { | |
4069 | case NFT_JUMP: | |
4070 | case NFT_GOTO: | |
4071 | data->verdict.chain->use++; | |
4072 | break; | |
4073 | } | |
4074 | } | |
4075 | } | |
4076 | ||
4077 | static void nft_set_elem_activate(const struct net *net, | |
4078 | const struct nft_set *set, | |
4079 | struct nft_set_elem *elem) | |
4080 | { | |
4081 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4082 | ||
4083 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4084 | nft_data_hold(nft_set_ext_data(ext), set->dtype); | |
4085 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4086 | (*nft_set_ext_obj(ext))->use++; | |
4087 | } | |
4088 | ||
4089 | static void nft_set_elem_deactivate(const struct net *net, | |
4090 | const struct nft_set *set, | |
4091 | struct nft_set_elem *elem) | |
4092 | { | |
4093 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); | |
4094 | ||
4095 | if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) | |
4096 | nft_data_release(nft_set_ext_data(ext), set->dtype); | |
4097 | if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) | |
4098 | (*nft_set_ext_obj(ext))->use--; | |
4099 | } | |
4100 | ||
60319eb1 | 4101 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
4102 | const struct nlattr *attr) |
4103 | { | |
4104 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3971ca14 | 4105 | struct nft_set_ext_tmpl tmpl; |
20a69341 PM |
4106 | struct nft_data_desc desc; |
4107 | struct nft_set_elem elem; | |
3971ca14 | 4108 | struct nft_set_ext *ext; |
60319eb1 | 4109 | struct nft_trans *trans; |
3971ca14 PNA |
4110 | u32 flags = 0; |
4111 | void *priv; | |
20a69341 PM |
4112 | int err; |
4113 | ||
4114 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
fceb6435 | 4115 | nft_set_elem_policy, NULL); |
20a69341 PM |
4116 | if (err < 0) |
4117 | goto err1; | |
4118 | ||
4119 | err = -EINVAL; | |
4120 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
4121 | goto err1; | |
4122 | ||
3971ca14 PNA |
4123 | nft_set_ext_prepare(&tmpl); |
4124 | ||
4125 | err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); | |
4126 | if (err < 0) | |
4127 | return err; | |
4128 | if (flags != 0) | |
4129 | nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); | |
4130 | ||
7d740264 | 4131 | err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc, |
d0a11fc3 | 4132 | nla[NFTA_SET_ELEM_KEY]); |
20a69341 PM |
4133 | if (err < 0) |
4134 | goto err1; | |
4135 | ||
4136 | err = -EINVAL; | |
4137 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
4138 | goto err2; | |
4139 | ||
3971ca14 PNA |
4140 | nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len); |
4141 | ||
4142 | err = -ENOMEM; | |
4143 | elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0, | |
4144 | GFP_KERNEL); | |
4145 | if (elem.priv == NULL) | |
4146 | goto err2; | |
4147 | ||
4148 | ext = nft_set_elem_ext(set, elem.priv); | |
4149 | if (flags) | |
4150 | *nft_set_ext_flags(ext) = flags; | |
4151 | ||
60319eb1 | 4152 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
609ccf08 JL |
4153 | if (trans == NULL) { |
4154 | err = -ENOMEM; | |
3971ca14 | 4155 | goto err3; |
609ccf08 | 4156 | } |
20a69341 | 4157 | |
42a55769 | 4158 | priv = set->ops->deactivate(ctx->net, set, &elem); |
3971ca14 | 4159 | if (priv == NULL) { |
cc02e457 | 4160 | err = -ENOENT; |
3971ca14 | 4161 | goto err4; |
cc02e457 | 4162 | } |
3971ca14 PNA |
4163 | kfree(elem.priv); |
4164 | elem.priv = priv; | |
cc02e457 | 4165 | |
59105446 PNA |
4166 | nft_set_elem_deactivate(ctx->net, set, &elem); |
4167 | ||
60319eb1 | 4168 | nft_trans_elem(trans) = elem; |
46bbafce | 4169 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0dc13625 | 4170 | return 0; |
cc02e457 | 4171 | |
3971ca14 | 4172 | err4: |
cc02e457 | 4173 | kfree(trans); |
3971ca14 PNA |
4174 | err3: |
4175 | kfree(elem.priv); | |
20a69341 | 4176 | err2: |
59105446 | 4177 | nft_data_release(&elem.key.val, desc.type); |
20a69341 PM |
4178 | err1: |
4179 | return err; | |
4180 | } | |
4181 | ||
8411b644 | 4182 | static int nft_flush_set(const struct nft_ctx *ctx, |
de70185d | 4183 | struct nft_set *set, |
8411b644 | 4184 | const struct nft_set_iter *iter, |
de70185d | 4185 | struct nft_set_elem *elem) |
8411b644 PNA |
4186 | { |
4187 | struct nft_trans *trans; | |
4188 | int err; | |
4189 | ||
4190 | trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, | |
4191 | sizeof(struct nft_trans_elem), GFP_ATOMIC); | |
4192 | if (!trans) | |
4193 | return -ENOMEM; | |
4194 | ||
1ba1c414 | 4195 | if (!set->ops->flush(ctx->net, set, elem->priv)) { |
8411b644 PNA |
4196 | err = -ENOENT; |
4197 | goto err1; | |
4198 | } | |
b2c11e4b | 4199 | set->ndeact++; |
8411b644 | 4200 | |
de70185d PNA |
4201 | nft_trans_elem_set(trans) = set; |
4202 | nft_trans_elem(trans) = *elem; | |
8411b644 PNA |
4203 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
4204 | ||
4205 | return 0; | |
4206 | err1: | |
4207 | kfree(trans); | |
4208 | return err; | |
4209 | } | |
4210 | ||
633c9a84 PNA |
4211 | static int nf_tables_delsetelem(struct net *net, struct sock *nlsk, |
4212 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4213 | const struct nlattr * const nla[], |
4214 | struct netlink_ext_ack *extack) | |
20a69341 | 4215 | { |
f2a6d766 | 4216 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
4217 | const struct nlattr *attr; |
4218 | struct nft_set *set; | |
4219 | struct nft_ctx ctx; | |
60319eb1 | 4220 | int rem, err = 0; |
20a69341 | 4221 | |
f2a6d766 | 4222 | err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask); |
20a69341 PM |
4223 | if (err < 0) |
4224 | return err; | |
4225 | ||
37a9cc52 PNA |
4226 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], |
4227 | genmask); | |
20a69341 PM |
4228 | if (IS_ERR(set)) |
4229 | return PTR_ERR(set); | |
4230 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
4231 | return -EBUSY; | |
4232 | ||
8411b644 | 4233 | if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) { |
baa2d42c PNA |
4234 | struct nft_set_iter iter = { |
4235 | .genmask = genmask, | |
4236 | .fn = nft_flush_set, | |
8411b644 | 4237 | }; |
baa2d42c | 4238 | set->ops->walk(&ctx, set, &iter); |
8411b644 | 4239 | |
baa2d42c | 4240 | return iter.err; |
8411b644 PNA |
4241 | } |
4242 | ||
20a69341 PM |
4243 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
4244 | err = nft_del_setelem(&ctx, set, attr); | |
4245 | if (err < 0) | |
60319eb1 | 4246 | break; |
4fefee57 | 4247 | |
3dd0673a | 4248 | set->ndeact++; |
20a69341 | 4249 | } |
60319eb1 | 4250 | return err; |
20a69341 PM |
4251 | } |
4252 | ||
cfed7e1b PM |
4253 | void nft_set_gc_batch_release(struct rcu_head *rcu) |
4254 | { | |
4255 | struct nft_set_gc_batch *gcb; | |
4256 | unsigned int i; | |
4257 | ||
4258 | gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); | |
4259 | for (i = 0; i < gcb->head.cnt; i++) | |
61f9e292 | 4260 | nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); |
cfed7e1b PM |
4261 | kfree(gcb); |
4262 | } | |
4263 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_release); | |
4264 | ||
4265 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
4266 | gfp_t gfp) | |
4267 | { | |
4268 | struct nft_set_gc_batch *gcb; | |
4269 | ||
4270 | gcb = kzalloc(sizeof(*gcb), gfp); | |
4271 | if (gcb == NULL) | |
4272 | return gcb; | |
4273 | gcb->head.set = set; | |
4274 | return gcb; | |
4275 | } | |
4276 | EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc); | |
4277 | ||
e5009240 PNA |
4278 | /* |
4279 | * Stateful objects | |
4280 | */ | |
4281 | ||
4282 | /** | |
4283 | * nft_register_obj- register nf_tables stateful object type | |
4284 | * @obj: object type | |
4285 | * | |
4286 | * Registers the object type for use with nf_tables. Returns zero on | |
4287 | * success or a negative errno code otherwise. | |
4288 | */ | |
4289 | int nft_register_obj(struct nft_object_type *obj_type) | |
4290 | { | |
4291 | if (obj_type->type == NFT_OBJECT_UNSPEC) | |
4292 | return -EINVAL; | |
4293 | ||
4294 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4295 | list_add_rcu(&obj_type->list, &nf_tables_objects); | |
4296 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4297 | return 0; | |
4298 | } | |
4299 | EXPORT_SYMBOL_GPL(nft_register_obj); | |
4300 | ||
4301 | /** | |
4302 | * nft_unregister_obj - unregister nf_tables object type | |
4303 | * @obj: object type | |
4304 | * | |
4305 | * Unregisters the object type for use with nf_tables. | |
4306 | */ | |
4307 | void nft_unregister_obj(struct nft_object_type *obj_type) | |
4308 | { | |
4309 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4310 | list_del_rcu(&obj_type->list); | |
4311 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4312 | } | |
4313 | EXPORT_SYMBOL_GPL(nft_unregister_obj); | |
4314 | ||
4315 | struct nft_object *nf_tables_obj_lookup(const struct nft_table *table, | |
4316 | const struct nlattr *nla, | |
4317 | u32 objtype, u8 genmask) | |
4318 | { | |
4319 | struct nft_object *obj; | |
4320 | ||
4321 | list_for_each_entry(obj, &table->objects, list) { | |
4322 | if (!nla_strcmp(nla, obj->name) && | |
dfc46034 | 4323 | objtype == obj->ops->type->type && |
e5009240 PNA |
4324 | nft_active_genmask(obj, genmask)) |
4325 | return obj; | |
4326 | } | |
4327 | return ERR_PTR(-ENOENT); | |
4328 | } | |
4329 | EXPORT_SYMBOL_GPL(nf_tables_obj_lookup); | |
4330 | ||
3ecbfd65 HS |
4331 | struct nft_object *nf_tables_obj_lookup_byhandle(const struct nft_table *table, |
4332 | const struct nlattr *nla, | |
4333 | u32 objtype, u8 genmask) | |
4334 | { | |
4335 | struct nft_object *obj; | |
4336 | ||
4337 | list_for_each_entry(obj, &table->objects, list) { | |
4338 | if (be64_to_cpu(nla_get_be64(nla)) == obj->handle && | |
4339 | objtype == obj->ops->type->type && | |
4340 | nft_active_genmask(obj, genmask)) | |
4341 | return obj; | |
4342 | } | |
4343 | return ERR_PTR(-ENOENT); | |
4344 | } | |
4345 | ||
e5009240 | 4346 | static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { |
b2fbd044 LZ |
4347 | [NFTA_OBJ_TABLE] = { .type = NLA_STRING, |
4348 | .len = NFT_TABLE_MAXNAMELEN - 1 }, | |
4349 | [NFTA_OBJ_NAME] = { .type = NLA_STRING, | |
4350 | .len = NFT_OBJ_MAXNAMELEN - 1 }, | |
e5009240 PNA |
4351 | [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, |
4352 | [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, | |
3ecbfd65 | 4353 | [NFTA_OBJ_HANDLE] = { .type = NLA_U64}, |
e5009240 PNA |
4354 | }; |
4355 | ||
84fba055 FW |
4356 | static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, |
4357 | const struct nft_object_type *type, | |
e5009240 PNA |
4358 | const struct nlattr *attr) |
4359 | { | |
4360 | struct nlattr *tb[type->maxattr + 1]; | |
dfc46034 | 4361 | const struct nft_object_ops *ops; |
e5009240 PNA |
4362 | struct nft_object *obj; |
4363 | int err; | |
4364 | ||
4365 | if (attr) { | |
fceb6435 JB |
4366 | err = nla_parse_nested(tb, type->maxattr, attr, type->policy, |
4367 | NULL); | |
e5009240 PNA |
4368 | if (err < 0) |
4369 | goto err1; | |
4370 | } else { | |
4371 | memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); | |
4372 | } | |
4373 | ||
dfc46034 PBG |
4374 | if (type->select_ops) { |
4375 | ops = type->select_ops(ctx, (const struct nlattr * const *)tb); | |
4376 | if (IS_ERR(ops)) { | |
4377 | err = PTR_ERR(ops); | |
4378 | goto err1; | |
4379 | } | |
4380 | } else { | |
4381 | ops = type->ops; | |
4382 | } | |
4383 | ||
e5009240 | 4384 | err = -ENOMEM; |
dfc46034 | 4385 | obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL); |
e5009240 PNA |
4386 | if (obj == NULL) |
4387 | goto err1; | |
4388 | ||
dfc46034 | 4389 | err = ops->init(ctx, (const struct nlattr * const *)tb, obj); |
e5009240 PNA |
4390 | if (err < 0) |
4391 | goto err2; | |
4392 | ||
dfc46034 PBG |
4393 | obj->ops = ops; |
4394 | ||
e5009240 PNA |
4395 | return obj; |
4396 | err2: | |
4397 | kfree(obj); | |
4398 | err1: | |
4399 | return ERR_PTR(err); | |
4400 | } | |
4401 | ||
4402 | static int nft_object_dump(struct sk_buff *skb, unsigned int attr, | |
43da04a5 | 4403 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4404 | { |
4405 | struct nlattr *nest; | |
4406 | ||
4407 | nest = nla_nest_start(skb, attr); | |
4408 | if (!nest) | |
4409 | goto nla_put_failure; | |
dfc46034 | 4410 | if (obj->ops->dump(skb, obj, reset) < 0) |
e5009240 PNA |
4411 | goto nla_put_failure; |
4412 | nla_nest_end(skb, nest); | |
4413 | return 0; | |
4414 | ||
4415 | nla_put_failure: | |
4416 | return -1; | |
4417 | } | |
4418 | ||
4419 | static const struct nft_object_type *__nft_obj_type_get(u32 objtype) | |
4420 | { | |
4421 | const struct nft_object_type *type; | |
4422 | ||
4423 | list_for_each_entry(type, &nf_tables_objects, list) { | |
4424 | if (objtype == type->type) | |
4425 | return type; | |
4426 | } | |
4427 | return NULL; | |
4428 | } | |
4429 | ||
4430 | static const struct nft_object_type *nft_obj_type_get(u32 objtype) | |
4431 | { | |
4432 | const struct nft_object_type *type; | |
4433 | ||
4434 | type = __nft_obj_type_get(objtype); | |
4435 | if (type != NULL && try_module_get(type->owner)) | |
4436 | return type; | |
4437 | ||
4438 | #ifdef CONFIG_MODULES | |
4439 | if (type == NULL) { | |
4440 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4441 | request_module("nft-obj-%u", objtype); | |
4442 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4443 | if (__nft_obj_type_get(objtype)) | |
4444 | return ERR_PTR(-EAGAIN); | |
4445 | } | |
4446 | #endif | |
4447 | return ERR_PTR(-ENOENT); | |
4448 | } | |
4449 | ||
4450 | static int nf_tables_newobj(struct net *net, struct sock *nlsk, | |
4451 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4452 | const struct nlattr * const nla[], |
4453 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4454 | { |
4455 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4456 | const struct nft_object_type *type; | |
4457 | u8 genmask = nft_genmask_next(net); | |
4458 | int family = nfmsg->nfgen_family; | |
e5009240 PNA |
4459 | struct nft_table *table; |
4460 | struct nft_object *obj; | |
4461 | struct nft_ctx ctx; | |
4462 | u32 objtype; | |
4463 | int err; | |
4464 | ||
4465 | if (!nla[NFTA_OBJ_TYPE] || | |
4466 | !nla[NFTA_OBJ_NAME] || | |
4467 | !nla[NFTA_OBJ_DATA]) | |
4468 | return -EINVAL; | |
4469 | ||
98319cb9 | 4470 | table = nf_tables_table_lookup(net, nla[NFTA_OBJ_TABLE], family, |
36596dad | 4471 | genmask); |
e5009240 PNA |
4472 | if (IS_ERR(table)) |
4473 | return PTR_ERR(table); | |
4474 | ||
4475 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4476 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4477 | if (IS_ERR(obj)) { | |
4478 | err = PTR_ERR(obj); | |
4479 | if (err != -ENOENT) | |
4480 | return err; | |
4481 | ||
1a28ad74 | 4482 | } else { |
e5009240 PNA |
4483 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
4484 | return -EEXIST; | |
4485 | ||
4486 | return 0; | |
4487 | } | |
4488 | ||
98319cb9 | 4489 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e5009240 PNA |
4490 | |
4491 | type = nft_obj_type_get(objtype); | |
4492 | if (IS_ERR(type)) | |
4493 | return PTR_ERR(type); | |
4494 | ||
84fba055 | 4495 | obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); |
e5009240 PNA |
4496 | if (IS_ERR(obj)) { |
4497 | err = PTR_ERR(obj); | |
4498 | goto err1; | |
4499 | } | |
18965317 | 4500 | obj->table = table; |
3ecbfd65 HS |
4501 | obj->handle = nf_tables_alloc_handle(table); |
4502 | ||
61509575 PS |
4503 | obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL); |
4504 | if (!obj->name) { | |
4505 | err = -ENOMEM; | |
4506 | goto err2; | |
4507 | } | |
e5009240 PNA |
4508 | |
4509 | err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); | |
4510 | if (err < 0) | |
61509575 | 4511 | goto err3; |
e5009240 PNA |
4512 | |
4513 | list_add_tail_rcu(&obj->list, &table->objects); | |
4514 | table->use++; | |
4515 | return 0; | |
61509575 PS |
4516 | err3: |
4517 | kfree(obj->name); | |
e5009240 | 4518 | err2: |
dfc46034 PBG |
4519 | if (obj->ops->destroy) |
4520 | obj->ops->destroy(obj); | |
e5009240 PNA |
4521 | kfree(obj); |
4522 | err1: | |
4523 | module_put(type->owner); | |
4524 | return err; | |
4525 | } | |
4526 | ||
4527 | static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, | |
4528 | u32 portid, u32 seq, int event, u32 flags, | |
4529 | int family, const struct nft_table *table, | |
43da04a5 | 4530 | struct nft_object *obj, bool reset) |
e5009240 PNA |
4531 | { |
4532 | struct nfgenmsg *nfmsg; | |
4533 | struct nlmsghdr *nlh; | |
4534 | ||
dedb67c4 | 4535 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); |
e5009240 PNA |
4536 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); |
4537 | if (nlh == NULL) | |
4538 | goto nla_put_failure; | |
4539 | ||
4540 | nfmsg = nlmsg_data(nlh); | |
4541 | nfmsg->nfgen_family = family; | |
4542 | nfmsg->version = NFNETLINK_V0; | |
4543 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
4544 | ||
4545 | if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || | |
4546 | nla_put_string(skb, NFTA_OBJ_NAME, obj->name) || | |
dfc46034 | 4547 | nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) || |
e5009240 | 4548 | nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || |
3ecbfd65 HS |
4549 | nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) || |
4550 | nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle), | |
4551 | NFTA_OBJ_PAD)) | |
e5009240 PNA |
4552 | goto nla_put_failure; |
4553 | ||
4554 | nlmsg_end(skb, nlh); | |
4555 | return 0; | |
4556 | ||
4557 | nla_put_failure: | |
4558 | nlmsg_trim(skb, nlh); | |
4559 | return -1; | |
4560 | } | |
4561 | ||
a9fea2a3 | 4562 | struct nft_obj_filter { |
e46abbcc | 4563 | char *table; |
a9fea2a3 PNA |
4564 | u32 type; |
4565 | }; | |
4566 | ||
e5009240 PNA |
4567 | static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) |
4568 | { | |
4569 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
e5009240 | 4570 | const struct nft_table *table; |
e5009240 | 4571 | unsigned int idx = 0, s_idx = cb->args[0]; |
a9fea2a3 | 4572 | struct nft_obj_filter *filter = cb->data; |
e5009240 PNA |
4573 | struct net *net = sock_net(skb->sk); |
4574 | int family = nfmsg->nfgen_family; | |
43da04a5 PNA |
4575 | struct nft_object *obj; |
4576 | bool reset = false; | |
4577 | ||
4578 | if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) | |
4579 | reset = true; | |
e5009240 PNA |
4580 | |
4581 | rcu_read_lock(); | |
4582 | cb->seq = net->nft.base_seq; | |
4583 | ||
36596dad | 4584 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 4585 | if (family != NFPROTO_UNSPEC && family != table->family) |
e5009240 PNA |
4586 | continue; |
4587 | ||
36596dad PNA |
4588 | list_for_each_entry_rcu(obj, &table->objects, list) { |
4589 | if (!nft_is_active(net, obj)) | |
4590 | goto cont; | |
4591 | if (idx < s_idx) | |
4592 | goto cont; | |
4593 | if (idx > s_idx) | |
4594 | memset(&cb->args[1], 0, | |
4595 | sizeof(cb->args) - sizeof(cb->args[0])); | |
4596 | if (filter && filter->table[0] && | |
4597 | strcmp(filter->table, table->name)) | |
4598 | goto cont; | |
4599 | if (filter && | |
4600 | filter->type != NFT_OBJECT_UNSPEC && | |
4601 | obj->ops->type->type != filter->type) | |
4602 | goto cont; | |
a9fea2a3 | 4603 | |
36596dad PNA |
4604 | if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, |
4605 | cb->nlh->nlmsg_seq, | |
4606 | NFT_MSG_NEWOBJ, | |
4607 | NLM_F_MULTI | NLM_F_APPEND, | |
98319cb9 | 4608 | table->family, table, |
36596dad PNA |
4609 | obj, reset) < 0) |
4610 | goto done; | |
e5009240 | 4611 | |
36596dad | 4612 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
e5009240 | 4613 | cont: |
36596dad | 4614 | idx++; |
e5009240 PNA |
4615 | } |
4616 | } | |
4617 | done: | |
4618 | rcu_read_unlock(); | |
4619 | ||
4620 | cb->args[0] = idx; | |
4621 | return skb->len; | |
4622 | } | |
4623 | ||
a9fea2a3 PNA |
4624 | static int nf_tables_dump_obj_done(struct netlink_callback *cb) |
4625 | { | |
e46abbcc PS |
4626 | struct nft_obj_filter *filter = cb->data; |
4627 | ||
8bea728d HL |
4628 | if (filter) { |
4629 | kfree(filter->table); | |
4630 | kfree(filter); | |
4631 | } | |
a9fea2a3 PNA |
4632 | |
4633 | return 0; | |
4634 | } | |
4635 | ||
4636 | static struct nft_obj_filter * | |
4637 | nft_obj_filter_alloc(const struct nlattr * const nla[]) | |
4638 | { | |
4639 | struct nft_obj_filter *filter; | |
4640 | ||
4641 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); | |
4642 | if (!filter) | |
4643 | return ERR_PTR(-ENOMEM); | |
4644 | ||
e46abbcc PS |
4645 | if (nla[NFTA_OBJ_TABLE]) { |
4646 | filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL); | |
4647 | if (!filter->table) { | |
4648 | kfree(filter); | |
4649 | return ERR_PTR(-ENOMEM); | |
4650 | } | |
4651 | } | |
a9fea2a3 PNA |
4652 | if (nla[NFTA_OBJ_TYPE]) |
4653 | filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4654 | ||
4655 | return filter; | |
4656 | } | |
4657 | ||
e5009240 PNA |
4658 | static int nf_tables_getobj(struct net *net, struct sock *nlsk, |
4659 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
4660 | const struct nlattr * const nla[], |
4661 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4662 | { |
4663 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4664 | u8 genmask = nft_genmask_cur(net); | |
4665 | int family = nfmsg->nfgen_family; | |
e5009240 PNA |
4666 | const struct nft_table *table; |
4667 | struct nft_object *obj; | |
4668 | struct sk_buff *skb2; | |
43da04a5 | 4669 | bool reset = false; |
e5009240 PNA |
4670 | u32 objtype; |
4671 | int err; | |
4672 | ||
4673 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
4674 | struct netlink_dump_control c = { | |
4675 | .dump = nf_tables_dump_obj, | |
a9fea2a3 | 4676 | .done = nf_tables_dump_obj_done, |
e5009240 | 4677 | }; |
a9fea2a3 PNA |
4678 | |
4679 | if (nla[NFTA_OBJ_TABLE] || | |
4680 | nla[NFTA_OBJ_TYPE]) { | |
4681 | struct nft_obj_filter *filter; | |
4682 | ||
4683 | filter = nft_obj_filter_alloc(nla); | |
4684 | if (IS_ERR(filter)) | |
4685 | return -ENOMEM; | |
4686 | ||
4687 | c.data = filter; | |
4688 | } | |
e5009240 PNA |
4689 | return netlink_dump_start(nlsk, skb, nlh, &c); |
4690 | } | |
4691 | ||
4692 | if (!nla[NFTA_OBJ_NAME] || | |
4693 | !nla[NFTA_OBJ_TYPE]) | |
4694 | return -EINVAL; | |
4695 | ||
98319cb9 | 4696 | table = nf_tables_table_lookup(net, nla[NFTA_OBJ_TABLE], family, |
36596dad | 4697 | genmask); |
e5009240 PNA |
4698 | if (IS_ERR(table)) |
4699 | return PTR_ERR(table); | |
4700 | ||
4701 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
4702 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask); | |
4703 | if (IS_ERR(obj)) | |
4704 | return PTR_ERR(obj); | |
4705 | ||
4706 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
4707 | if (!skb2) | |
4708 | return -ENOMEM; | |
4709 | ||
43da04a5 PNA |
4710 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) |
4711 | reset = true; | |
4712 | ||
e5009240 PNA |
4713 | err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, |
4714 | nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, | |
43da04a5 | 4715 | family, table, obj, reset); |
e5009240 PNA |
4716 | if (err < 0) |
4717 | goto err; | |
4718 | ||
4719 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
4720 | err: | |
4721 | kfree_skb(skb2); | |
4722 | return err; | |
e5009240 PNA |
4723 | } |
4724 | ||
4725 | static void nft_obj_destroy(struct nft_object *obj) | |
4726 | { | |
dfc46034 PBG |
4727 | if (obj->ops->destroy) |
4728 | obj->ops->destroy(obj); | |
e5009240 | 4729 | |
dfc46034 | 4730 | module_put(obj->ops->type->owner); |
61509575 | 4731 | kfree(obj->name); |
e5009240 PNA |
4732 | kfree(obj); |
4733 | } | |
4734 | ||
4735 | static int nf_tables_delobj(struct net *net, struct sock *nlsk, | |
04ba724b PNA |
4736 | struct sk_buff *skb, const struct nlmsghdr *nlh, |
4737 | const struct nlattr * const nla[], | |
4738 | struct netlink_ext_ack *extack) | |
e5009240 PNA |
4739 | { |
4740 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
4741 | u8 genmask = nft_genmask_next(net); | |
4742 | int family = nfmsg->nfgen_family; | |
e5009240 PNA |
4743 | struct nft_table *table; |
4744 | struct nft_object *obj; | |
4745 | struct nft_ctx ctx; | |
4746 | u32 objtype; | |
4747 | ||
4748 | if (!nla[NFTA_OBJ_TYPE] || | |
3ecbfd65 | 4749 | (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE])) |
e5009240 PNA |
4750 | return -EINVAL; |
4751 | ||
98319cb9 | 4752 | table = nf_tables_table_lookup(net, nla[NFTA_OBJ_TABLE], family, |
36596dad | 4753 | genmask); |
e5009240 PNA |
4754 | if (IS_ERR(table)) |
4755 | return PTR_ERR(table); | |
4756 | ||
4757 | objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); | |
3ecbfd65 HS |
4758 | if (nla[NFTA_OBJ_HANDLE]) |
4759 | obj = nf_tables_obj_lookup_byhandle(table, nla[NFTA_OBJ_HANDLE], | |
4760 | objtype, genmask); | |
4761 | else | |
4762 | obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], | |
4763 | objtype, genmask); | |
e5009240 PNA |
4764 | if (IS_ERR(obj)) |
4765 | return PTR_ERR(obj); | |
4766 | if (obj->use > 0) | |
4767 | return -EBUSY; | |
4768 | ||
98319cb9 | 4769 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
e5009240 PNA |
4770 | |
4771 | return nft_delobj(&ctx, obj); | |
4772 | } | |
4773 | ||
25e94a99 PNA |
4774 | void nft_obj_notify(struct net *net, struct nft_table *table, |
4775 | struct nft_object *obj, u32 portid, u32 seq, int event, | |
4776 | int family, int report, gfp_t gfp) | |
e5009240 PNA |
4777 | { |
4778 | struct sk_buff *skb; | |
4779 | int err; | |
4780 | ||
2599e989 PNA |
4781 | if (!report && |
4782 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 4783 | return; |
e5009240 | 4784 | |
2599e989 | 4785 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp); |
e5009240 PNA |
4786 | if (skb == NULL) |
4787 | goto err; | |
4788 | ||
2599e989 PNA |
4789 | err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family, |
4790 | table, obj, false); | |
e5009240 PNA |
4791 | if (err < 0) { |
4792 | kfree_skb(skb); | |
4793 | goto err; | |
4794 | } | |
4795 | ||
25e94a99 PNA |
4796 | nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp); |
4797 | return; | |
e5009240 | 4798 | err: |
25e94a99 | 4799 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); |
e5009240 | 4800 | } |
2599e989 PNA |
4801 | EXPORT_SYMBOL_GPL(nft_obj_notify); |
4802 | ||
25e94a99 PNA |
4803 | static void nf_tables_obj_notify(const struct nft_ctx *ctx, |
4804 | struct nft_object *obj, int event) | |
2599e989 | 4805 | { |
25e94a99 | 4806 | nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, |
36596dad | 4807 | ctx->family, ctx->report, GFP_KERNEL); |
2599e989 | 4808 | } |
e5009240 | 4809 | |
3b49e2e9 PNA |
4810 | /* |
4811 | * Flow tables | |
4812 | */ | |
4813 | void nft_register_flowtable_type(struct nf_flowtable_type *type) | |
4814 | { | |
4815 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4816 | list_add_tail_rcu(&type->list, &nf_tables_flowtables); | |
4817 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4818 | } | |
4819 | EXPORT_SYMBOL_GPL(nft_register_flowtable_type); | |
4820 | ||
4821 | void nft_unregister_flowtable_type(struct nf_flowtable_type *type) | |
4822 | { | |
4823 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
4824 | list_del_rcu(&type->list); | |
4825 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
4826 | } | |
4827 | EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type); | |
4828 | ||
4829 | static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = { | |
4830 | [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING, | |
4831 | .len = NFT_NAME_MAXLEN - 1 }, | |
4832 | [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING, | |
4833 | .len = NFT_NAME_MAXLEN - 1 }, | |
4834 | [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED }, | |
3ecbfd65 | 4835 | [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 }, |
3b49e2e9 PNA |
4836 | }; |
4837 | ||
4838 | struct nft_flowtable *nf_tables_flowtable_lookup(const struct nft_table *table, | |
4839 | const struct nlattr *nla, | |
4840 | u8 genmask) | |
4841 | { | |
4842 | struct nft_flowtable *flowtable; | |
4843 | ||
4844 | list_for_each_entry(flowtable, &table->flowtables, list) { | |
4845 | if (!nla_strcmp(nla, flowtable->name) && | |
4846 | nft_active_genmask(flowtable, genmask)) | |
4847 | return flowtable; | |
4848 | } | |
4849 | return ERR_PTR(-ENOENT); | |
4850 | } | |
4851 | EXPORT_SYMBOL_GPL(nf_tables_flowtable_lookup); | |
4852 | ||
3ecbfd65 HS |
4853 | struct nft_flowtable * |
4854 | nf_tables_flowtable_lookup_byhandle(const struct nft_table *table, | |
4855 | const struct nlattr *nla, u8 genmask) | |
4856 | { | |
4857 | struct nft_flowtable *flowtable; | |
4858 | ||
4859 | list_for_each_entry(flowtable, &table->flowtables, list) { | |
4860 | if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle && | |
4861 | nft_active_genmask(flowtable, genmask)) | |
4862 | return flowtable; | |
4863 | } | |
4864 | return ERR_PTR(-ENOENT); | |
4865 | } | |
4866 | ||
3b49e2e9 PNA |
4867 | #define NFT_FLOWTABLE_DEVICE_MAX 8 |
4868 | ||
4869 | static int nf_tables_parse_devices(const struct nft_ctx *ctx, | |
4870 | const struct nlattr *attr, | |
4871 | struct net_device *dev_array[], int *len) | |
4872 | { | |
4873 | const struct nlattr *tmp; | |
4874 | struct net_device *dev; | |
4875 | char ifname[IFNAMSIZ]; | |
4876 | int rem, n = 0, err; | |
4877 | ||
4878 | nla_for_each_nested(tmp, attr, rem) { | |
4879 | if (nla_type(tmp) != NFTA_DEVICE_NAME) { | |
4880 | err = -EINVAL; | |
4881 | goto err1; | |
4882 | } | |
4883 | ||
4884 | nla_strlcpy(ifname, tmp, IFNAMSIZ); | |
4885 | dev = dev_get_by_name(ctx->net, ifname); | |
4886 | if (!dev) { | |
4887 | err = -ENOENT; | |
4888 | goto err1; | |
4889 | } | |
4890 | ||
4891 | dev_array[n++] = dev; | |
4892 | if (n == NFT_FLOWTABLE_DEVICE_MAX) { | |
4893 | err = -EFBIG; | |
4894 | goto err1; | |
4895 | } | |
4896 | } | |
4897 | if (!len) | |
4898 | return -EINVAL; | |
4899 | ||
4900 | err = 0; | |
4901 | err1: | |
4902 | *len = n; | |
4903 | return err; | |
4904 | } | |
4905 | ||
4906 | static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = { | |
4907 | [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 }, | |
4908 | [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
4909 | [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED }, | |
4910 | }; | |
4911 | ||
4912 | static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx, | |
4913 | const struct nlattr *attr, | |
4914 | struct nft_flowtable *flowtable) | |
4915 | { | |
4916 | struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX]; | |
4917 | struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1]; | |
4918 | struct nf_hook_ops *ops; | |
4919 | int hooknum, priority; | |
4920 | int err, n = 0, i; | |
4921 | ||
4922 | err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr, | |
4923 | nft_flowtable_hook_policy, NULL); | |
4924 | if (err < 0) | |
4925 | return err; | |
4926 | ||
4927 | if (!tb[NFTA_FLOWTABLE_HOOK_NUM] || | |
4928 | !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] || | |
4929 | !tb[NFTA_FLOWTABLE_HOOK_DEVS]) | |
4930 | return -EINVAL; | |
4931 | ||
4932 | hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); | |
fe19c04c | 4933 | if (hooknum != NF_NETDEV_INGRESS) |
3b49e2e9 PNA |
4934 | return -EINVAL; |
4935 | ||
4936 | priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); | |
4937 | ||
4938 | err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS], | |
4939 | dev_array, &n); | |
4940 | if (err < 0) | |
4941 | goto err1; | |
4942 | ||
4943 | ops = kzalloc(sizeof(struct nf_hook_ops) * n, GFP_KERNEL); | |
4944 | if (!ops) { | |
4945 | err = -ENOMEM; | |
4946 | goto err1; | |
4947 | } | |
4948 | ||
0e839dfa PNA |
4949 | flowtable->hooknum = hooknum; |
4950 | flowtable->priority = priority; | |
3b49e2e9 PNA |
4951 | flowtable->ops = ops; |
4952 | flowtable->ops_len = n; | |
4953 | ||
4954 | for (i = 0; i < n; i++) { | |
4955 | flowtable->ops[i].pf = NFPROTO_NETDEV; | |
4956 | flowtable->ops[i].hooknum = hooknum; | |
4957 | flowtable->ops[i].priority = priority; | |
4958 | flowtable->ops[i].priv = &flowtable->data.rhashtable; | |
4959 | flowtable->ops[i].hook = flowtable->data.type->hook; | |
4960 | flowtable->ops[i].dev = dev_array[i]; | |
4961 | } | |
4962 | ||
4963 | err = 0; | |
4964 | err1: | |
4965 | for (i = 0; i < n; i++) | |
4966 | dev_put(dev_array[i]); | |
4967 | ||
4968 | return err; | |
4969 | } | |
4970 | ||
98319cb9 | 4971 | static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family) |
3b49e2e9 PNA |
4972 | { |
4973 | const struct nf_flowtable_type *type; | |
4974 | ||
4975 | list_for_each_entry(type, &nf_tables_flowtables, list) { | |
98319cb9 | 4976 | if (family == type->family) |
3b49e2e9 PNA |
4977 | return type; |
4978 | } | |
4979 | return NULL; | |
4980 | } | |
4981 | ||
98319cb9 | 4982 | static const struct nf_flowtable_type *nft_flowtable_type_get(u8 family) |
3b49e2e9 PNA |
4983 | { |
4984 | const struct nf_flowtable_type *type; | |
4985 | ||
98319cb9 | 4986 | type = __nft_flowtable_type_get(family); |
3b49e2e9 PNA |
4987 | if (type != NULL && try_module_get(type->owner)) |
4988 | return type; | |
4989 | ||
4990 | #ifdef CONFIG_MODULES | |
4991 | if (type == NULL) { | |
4992 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
98319cb9 | 4993 | request_module("nf-flowtable-%u", family); |
3b49e2e9 | 4994 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
98319cb9 | 4995 | if (__nft_flowtable_type_get(family)) |
3b49e2e9 PNA |
4996 | return ERR_PTR(-EAGAIN); |
4997 | } | |
4998 | #endif | |
4999 | return ERR_PTR(-ENOENT); | |
5000 | } | |
5001 | ||
5002 | void nft_flow_table_iterate(struct net *net, | |
5003 | void (*iter)(struct nf_flowtable *flowtable, void *data), | |
5004 | void *data) | |
5005 | { | |
5006 | struct nft_flowtable *flowtable; | |
3b49e2e9 PNA |
5007 | const struct nft_table *table; |
5008 | ||
c7f0030b PNA |
5009 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
5010 | list_for_each_entry(table, &net->nft.tables, list) { | |
5011 | list_for_each_entry(flowtable, &table->flowtables, list) { | |
dd4cbef7 | 5012 | iter(&flowtable->data, data); |
3b49e2e9 PNA |
5013 | } |
5014 | } | |
c7f0030b | 5015 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
3b49e2e9 PNA |
5016 | } |
5017 | EXPORT_SYMBOL_GPL(nft_flow_table_iterate); | |
5018 | ||
5019 | static void nft_unregister_flowtable_net_hooks(struct net *net, | |
5020 | struct nft_flowtable *flowtable) | |
5021 | { | |
5022 | int i; | |
5023 | ||
5024 | for (i = 0; i < flowtable->ops_len; i++) { | |
5025 | if (!flowtable->ops[i].dev) | |
5026 | continue; | |
5027 | ||
5028 | nf_unregister_net_hook(net, &flowtable->ops[i]); | |
5029 | } | |
5030 | } | |
5031 | ||
5032 | static int nf_tables_newflowtable(struct net *net, struct sock *nlsk, | |
5033 | struct sk_buff *skb, | |
5034 | const struct nlmsghdr *nlh, | |
5035 | const struct nlattr * const nla[], | |
5036 | struct netlink_ext_ack *extack) | |
5037 | { | |
5038 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5039 | const struct nf_flowtable_type *type; | |
5040 | u8 genmask = nft_genmask_next(net); | |
5041 | int family = nfmsg->nfgen_family; | |
5042 | struct nft_flowtable *flowtable; | |
3b49e2e9 PNA |
5043 | struct nft_table *table; |
5044 | struct nft_ctx ctx; | |
5045 | int err, i, k; | |
5046 | ||
5047 | if (!nla[NFTA_FLOWTABLE_TABLE] || | |
5048 | !nla[NFTA_FLOWTABLE_NAME] || | |
5049 | !nla[NFTA_FLOWTABLE_HOOK]) | |
5050 | return -EINVAL; | |
5051 | ||
36596dad | 5052 | table = nf_tables_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], |
98319cb9 | 5053 | family, genmask); |
3b49e2e9 PNA |
5054 | if (IS_ERR(table)) |
5055 | return PTR_ERR(table); | |
5056 | ||
5057 | flowtable = nf_tables_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], | |
5058 | genmask); | |
5059 | if (IS_ERR(flowtable)) { | |
5060 | err = PTR_ERR(flowtable); | |
5061 | if (err != -ENOENT) | |
5062 | return err; | |
5063 | } else { | |
5064 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
5065 | return -EEXIST; | |
5066 | ||
5067 | return 0; | |
5068 | } | |
5069 | ||
98319cb9 | 5070 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
3b49e2e9 PNA |
5071 | |
5072 | flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL); | |
5073 | if (!flowtable) | |
5074 | return -ENOMEM; | |
5075 | ||
5076 | flowtable->table = table; | |
3ecbfd65 HS |
5077 | flowtable->handle = nf_tables_alloc_handle(table); |
5078 | ||
3b49e2e9 PNA |
5079 | flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL); |
5080 | if (!flowtable->name) { | |
5081 | err = -ENOMEM; | |
5082 | goto err1; | |
5083 | } | |
5084 | ||
98319cb9 | 5085 | type = nft_flowtable_type_get(family); |
3b49e2e9 PNA |
5086 | if (IS_ERR(type)) { |
5087 | err = PTR_ERR(type); | |
5088 | goto err2; | |
5089 | } | |
5090 | ||
5091 | flowtable->data.type = type; | |
5092 | err = rhashtable_init(&flowtable->data.rhashtable, type->params); | |
5093 | if (err < 0) | |
5094 | goto err3; | |
5095 | ||
5096 | err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK], | |
5097 | flowtable); | |
5098 | if (err < 0) | |
5099 | goto err3; | |
5100 | ||
5101 | for (i = 0; i < flowtable->ops_len; i++) { | |
5102 | err = nf_register_net_hook(net, &flowtable->ops[i]); | |
5103 | if (err < 0) | |
5104 | goto err4; | |
5105 | } | |
5106 | ||
5107 | err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable); | |
5108 | if (err < 0) | |
5109 | goto err5; | |
5110 | ||
5111 | INIT_DEFERRABLE_WORK(&flowtable->data.gc_work, type->gc); | |
5112 | queue_delayed_work(system_power_efficient_wq, | |
5113 | &flowtable->data.gc_work, HZ); | |
5114 | ||
5115 | list_add_tail_rcu(&flowtable->list, &table->flowtables); | |
5116 | table->use++; | |
5117 | ||
5118 | return 0; | |
5119 | err5: | |
5120 | i = flowtable->ops_len; | |
5121 | err4: | |
5122 | for (k = i - 1; k >= 0; k--) | |
5123 | nf_unregister_net_hook(net, &flowtable->ops[i]); | |
5124 | ||
5125 | kfree(flowtable->ops); | |
5126 | err3: | |
5127 | module_put(type->owner); | |
5128 | err2: | |
5129 | kfree(flowtable->name); | |
5130 | err1: | |
5131 | kfree(flowtable); | |
5132 | return err; | |
5133 | } | |
5134 | ||
5135 | static int nf_tables_delflowtable(struct net *net, struct sock *nlsk, | |
5136 | struct sk_buff *skb, | |
5137 | const struct nlmsghdr *nlh, | |
5138 | const struct nlattr * const nla[], | |
5139 | struct netlink_ext_ack *extack) | |
5140 | { | |
5141 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5142 | u8 genmask = nft_genmask_next(net); | |
5143 | int family = nfmsg->nfgen_family; | |
5144 | struct nft_flowtable *flowtable; | |
3b49e2e9 PNA |
5145 | struct nft_table *table; |
5146 | struct nft_ctx ctx; | |
5147 | ||
36596dad | 5148 | table = nf_tables_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], |
98319cb9 | 5149 | family, genmask); |
3b49e2e9 PNA |
5150 | if (IS_ERR(table)) |
5151 | return PTR_ERR(table); | |
5152 | ||
3ecbfd65 HS |
5153 | if (nla[NFTA_FLOWTABLE_HANDLE]) |
5154 | flowtable = nf_tables_flowtable_lookup_byhandle(table, | |
5155 | nla[NFTA_FLOWTABLE_HANDLE], | |
5156 | genmask); | |
5157 | else | |
5158 | flowtable = nf_tables_flowtable_lookup(table, | |
5159 | nla[NFTA_FLOWTABLE_NAME], | |
5160 | genmask); | |
3b49e2e9 PNA |
5161 | if (IS_ERR(flowtable)) |
5162 | return PTR_ERR(flowtable); | |
5163 | if (flowtable->use > 0) | |
5164 | return -EBUSY; | |
5165 | ||
98319cb9 | 5166 | nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla); |
3b49e2e9 PNA |
5167 | |
5168 | return nft_delflowtable(&ctx, flowtable); | |
5169 | } | |
5170 | ||
5171 | static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net, | |
5172 | u32 portid, u32 seq, int event, | |
5173 | u32 flags, int family, | |
5174 | struct nft_flowtable *flowtable) | |
5175 | { | |
5176 | struct nlattr *nest, *nest_devs; | |
5177 | struct nfgenmsg *nfmsg; | |
5178 | struct nlmsghdr *nlh; | |
5179 | int i; | |
5180 | ||
5181 | event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); | |
5182 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
5183 | if (nlh == NULL) | |
5184 | goto nla_put_failure; | |
5185 | ||
5186 | nfmsg = nlmsg_data(nlh); | |
5187 | nfmsg->nfgen_family = family; | |
5188 | nfmsg->version = NFNETLINK_V0; | |
5189 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
5190 | ||
5191 | if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) || | |
5192 | nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) || | |
3ecbfd65 HS |
5193 | nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) || |
5194 | nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle), | |
5195 | NFTA_FLOWTABLE_PAD)) | |
3b49e2e9 PNA |
5196 | goto nla_put_failure; |
5197 | ||
5198 | nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK); | |
5199 | if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) || | |
5200 | nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority))) | |
5201 | goto nla_put_failure; | |
5202 | ||
5203 | nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS); | |
5204 | if (!nest_devs) | |
5205 | goto nla_put_failure; | |
5206 | ||
5207 | for (i = 0; i < flowtable->ops_len; i++) { | |
5208 | if (flowtable->ops[i].dev && | |
5209 | nla_put_string(skb, NFTA_DEVICE_NAME, | |
5210 | flowtable->ops[i].dev->name)) | |
5211 | goto nla_put_failure; | |
5212 | } | |
5213 | nla_nest_end(skb, nest_devs); | |
5214 | nla_nest_end(skb, nest); | |
5215 | ||
5216 | nlmsg_end(skb, nlh); | |
5217 | return 0; | |
5218 | ||
5219 | nla_put_failure: | |
5220 | nlmsg_trim(skb, nlh); | |
5221 | return -1; | |
5222 | } | |
5223 | ||
5224 | struct nft_flowtable_filter { | |
5225 | char *table; | |
5226 | }; | |
5227 | ||
5228 | static int nf_tables_dump_flowtable(struct sk_buff *skb, | |
5229 | struct netlink_callback *cb) | |
5230 | { | |
5231 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
5232 | struct nft_flowtable_filter *filter = cb->data; | |
5233 | unsigned int idx = 0, s_idx = cb->args[0]; | |
5234 | struct net *net = sock_net(skb->sk); | |
5235 | int family = nfmsg->nfgen_family; | |
5236 | struct nft_flowtable *flowtable; | |
3b49e2e9 PNA |
5237 | const struct nft_table *table; |
5238 | ||
5239 | rcu_read_lock(); | |
5240 | cb->seq = net->nft.base_seq; | |
5241 | ||
36596dad | 5242 | list_for_each_entry_rcu(table, &net->nft.tables, list) { |
98319cb9 | 5243 | if (family != NFPROTO_UNSPEC && family != table->family) |
3b49e2e9 PNA |
5244 | continue; |
5245 | ||
36596dad PNA |
5246 | list_for_each_entry_rcu(flowtable, &table->flowtables, list) { |
5247 | if (!nft_is_active(net, flowtable)) | |
5248 | goto cont; | |
5249 | if (idx < s_idx) | |
5250 | goto cont; | |
5251 | if (idx > s_idx) | |
5252 | memset(&cb->args[1], 0, | |
5253 | sizeof(cb->args) - sizeof(cb->args[0])); | |
5254 | if (filter && filter->table[0] && | |
5255 | strcmp(filter->table, table->name)) | |
5256 | goto cont; | |
3b49e2e9 | 5257 | |
36596dad PNA |
5258 | if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid, |
5259 | cb->nlh->nlmsg_seq, | |
5260 | NFT_MSG_NEWFLOWTABLE, | |
5261 | NLM_F_MULTI | NLM_F_APPEND, | |
98319cb9 | 5262 | table->family, flowtable) < 0) |
36596dad | 5263 | goto done; |
3b49e2e9 | 5264 | |
36596dad | 5265 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
3b49e2e9 | 5266 | cont: |
36596dad | 5267 | idx++; |
3b49e2e9 PNA |
5268 | } |
5269 | } | |
5270 | done: | |
5271 | rcu_read_unlock(); | |
5272 | ||
5273 | cb->args[0] = idx; | |
5274 | return skb->len; | |
5275 | } | |
5276 | ||
5277 | static int nf_tables_dump_flowtable_done(struct netlink_callback *cb) | |
5278 | { | |
5279 | struct nft_flowtable_filter *filter = cb->data; | |
5280 | ||
5281 | if (!filter) | |
5282 | return 0; | |
5283 | ||
5284 | kfree(filter->table); | |
5285 | kfree(filter); | |
5286 | ||
5287 | return 0; | |
5288 | } | |
5289 | ||
5290 | static struct nft_flowtable_filter * | |
5291 | nft_flowtable_filter_alloc(const struct nlattr * const nla[]) | |
5292 | { | |
5293 | struct nft_flowtable_filter *filter; | |
5294 | ||
5295 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); | |
5296 | if (!filter) | |
5297 | return ERR_PTR(-ENOMEM); | |
5298 | ||
5299 | if (nla[NFTA_FLOWTABLE_TABLE]) { | |
5300 | filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE], | |
5301 | GFP_KERNEL); | |
5302 | if (!filter->table) { | |
5303 | kfree(filter); | |
5304 | return ERR_PTR(-ENOMEM); | |
5305 | } | |
5306 | } | |
5307 | return filter; | |
5308 | } | |
5309 | ||
5310 | static int nf_tables_getflowtable(struct net *net, struct sock *nlsk, | |
5311 | struct sk_buff *skb, | |
5312 | const struct nlmsghdr *nlh, | |
5313 | const struct nlattr * const nla[], | |
5314 | struct netlink_ext_ack *extack) | |
5315 | { | |
5316 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
5317 | u8 genmask = nft_genmask_cur(net); | |
5318 | int family = nfmsg->nfgen_family; | |
5319 | struct nft_flowtable *flowtable; | |
3b49e2e9 PNA |
5320 | const struct nft_table *table; |
5321 | struct sk_buff *skb2; | |
5322 | int err; | |
5323 | ||
5324 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
5325 | struct netlink_dump_control c = { | |
5326 | .dump = nf_tables_dump_flowtable, | |
5327 | .done = nf_tables_dump_flowtable_done, | |
5328 | }; | |
5329 | ||
5330 | if (nla[NFTA_FLOWTABLE_TABLE]) { | |
5331 | struct nft_flowtable_filter *filter; | |
5332 | ||
5333 | filter = nft_flowtable_filter_alloc(nla); | |
5334 | if (IS_ERR(filter)) | |
5335 | return -ENOMEM; | |
5336 | ||
5337 | c.data = filter; | |
5338 | } | |
5339 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
5340 | } | |
5341 | ||
5342 | if (!nla[NFTA_FLOWTABLE_NAME]) | |
5343 | return -EINVAL; | |
5344 | ||
36596dad | 5345 | table = nf_tables_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], |
98319cb9 | 5346 | family, genmask); |
3b49e2e9 PNA |
5347 | if (IS_ERR(table)) |
5348 | return PTR_ERR(table); | |
5349 | ||
5350 | flowtable = nf_tables_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], | |
5351 | genmask); | |
03a0120f | 5352 | if (IS_ERR(flowtable)) |
3b49e2e9 PNA |
5353 | return PTR_ERR(flowtable); |
5354 | ||
5355 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
5356 | if (!skb2) | |
5357 | return -ENOMEM; | |
5358 | ||
5359 | err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid, | |
5360 | nlh->nlmsg_seq, | |
5361 | NFT_MSG_NEWFLOWTABLE, 0, family, | |
5362 | flowtable); | |
5363 | if (err < 0) | |
5364 | goto err; | |
5365 | ||
5366 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5367 | err: | |
5368 | kfree_skb(skb2); | |
5369 | return err; | |
5370 | } | |
5371 | ||
5372 | static void nf_tables_flowtable_notify(struct nft_ctx *ctx, | |
5373 | struct nft_flowtable *flowtable, | |
5374 | int event) | |
5375 | { | |
5376 | struct sk_buff *skb; | |
5377 | int err; | |
5378 | ||
5379 | if (ctx->report && | |
5380 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
5381 | return; | |
5382 | ||
5383 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
5384 | if (skb == NULL) | |
5385 | goto err; | |
5386 | ||
5387 | err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid, | |
5388 | ctx->seq, event, 0, | |
36596dad | 5389 | ctx->family, flowtable); |
3b49e2e9 PNA |
5390 | if (err < 0) { |
5391 | kfree_skb(skb); | |
5392 | goto err; | |
5393 | } | |
5394 | ||
5395 | nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
5396 | ctx->report, GFP_KERNEL); | |
5397 | return; | |
5398 | err: | |
5399 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); | |
5400 | } | |
5401 | ||
3b49e2e9 PNA |
5402 | static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable) |
5403 | { | |
5404 | cancel_delayed_work_sync(&flowtable->data.gc_work); | |
5405 | kfree(flowtable->name); | |
b408c5b0 PNA |
5406 | flowtable->data.type->free(&flowtable->data); |
5407 | rhashtable_destroy(&flowtable->data.rhashtable); | |
3b49e2e9 PNA |
5408 | module_put(flowtable->data.type->owner); |
5409 | } | |
5410 | ||
84d7fce6 PNA |
5411 | static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, |
5412 | u32 portid, u32 seq) | |
5413 | { | |
5414 | struct nlmsghdr *nlh; | |
5415 | struct nfgenmsg *nfmsg; | |
784b4e61 | 5416 | char buf[TASK_COMM_LEN]; |
dedb67c4 | 5417 | int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); |
84d7fce6 PNA |
5418 | |
5419 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0); | |
5420 | if (nlh == NULL) | |
5421 | goto nla_put_failure; | |
5422 | ||
5423 | nfmsg = nlmsg_data(nlh); | |
5424 | nfmsg->nfgen_family = AF_UNSPEC; | |
5425 | nfmsg->version = NFNETLINK_V0; | |
5426 | nfmsg->res_id = htons(net->nft.base_seq & 0xffff); | |
5427 | ||
784b4e61 PS |
5428 | if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) || |
5429 | nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) || | |
5430 | nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current))) | |
84d7fce6 PNA |
5431 | goto nla_put_failure; |
5432 | ||
053c095a JB |
5433 | nlmsg_end(skb, nlh); |
5434 | return 0; | |
84d7fce6 PNA |
5435 | |
5436 | nla_put_failure: | |
5437 | nlmsg_trim(skb, nlh); | |
5438 | return -EMSGSIZE; | |
5439 | } | |
5440 | ||
3b49e2e9 PNA |
5441 | static void nft_flowtable_event(unsigned long event, struct net_device *dev, |
5442 | struct nft_flowtable *flowtable) | |
5443 | { | |
5444 | int i; | |
5445 | ||
5446 | for (i = 0; i < flowtable->ops_len; i++) { | |
5447 | if (flowtable->ops[i].dev != dev) | |
5448 | continue; | |
5449 | ||
5450 | nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]); | |
5451 | flowtable->ops[i].dev = NULL; | |
5452 | break; | |
5453 | } | |
5454 | } | |
5455 | ||
5456 | static int nf_tables_flowtable_event(struct notifier_block *this, | |
5457 | unsigned long event, void *ptr) | |
5458 | { | |
5459 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
5460 | struct nft_flowtable *flowtable; | |
5461 | struct nft_table *table; | |
3b49e2e9 PNA |
5462 | |
5463 | if (event != NETDEV_UNREGISTER) | |
5464 | return 0; | |
5465 | ||
5466 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
36596dad PNA |
5467 | list_for_each_entry(table, &dev_net(dev)->nft.tables, list) { |
5468 | list_for_each_entry(flowtable, &table->flowtables, list) { | |
5469 | nft_flowtable_event(event, dev, flowtable); | |
3b49e2e9 PNA |
5470 | } |
5471 | } | |
5472 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
5473 | ||
5474 | return NOTIFY_DONE; | |
5475 | } | |
5476 | ||
5477 | static struct notifier_block nf_tables_flowtable_notifier = { | |
5478 | .notifier_call = nf_tables_flowtable_event, | |
5479 | }; | |
5480 | ||
25e94a99 PNA |
5481 | static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, |
5482 | int event) | |
84d7fce6 PNA |
5483 | { |
5484 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
5485 | struct sk_buff *skb2; | |
5486 | int err; | |
5487 | ||
5488 | if (nlmsg_report(nlh) && | |
5489 | !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
25e94a99 | 5490 | return; |
84d7fce6 | 5491 | |
84d7fce6 PNA |
5492 | skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
5493 | if (skb2 == NULL) | |
5494 | goto err; | |
5495 | ||
5496 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
5497 | nlh->nlmsg_seq); | |
5498 | if (err < 0) { | |
5499 | kfree_skb(skb2); | |
5500 | goto err; | |
5501 | } | |
5502 | ||
25e94a99 PNA |
5503 | nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
5504 | nlmsg_report(nlh), GFP_KERNEL); | |
5505 | return; | |
84d7fce6 | 5506 | err: |
25e94a99 PNA |
5507 | nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, |
5508 | -ENOBUFS); | |
84d7fce6 PNA |
5509 | } |
5510 | ||
7b8002a1 PNA |
5511 | static int nf_tables_getgen(struct net *net, struct sock *nlsk, |
5512 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
5513 | const struct nlattr * const nla[], |
5514 | struct netlink_ext_ack *extack) | |
84d7fce6 | 5515 | { |
84d7fce6 PNA |
5516 | struct sk_buff *skb2; |
5517 | int err; | |
5518 | ||
5519 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
5520 | if (skb2 == NULL) | |
5521 | return -ENOMEM; | |
5522 | ||
5523 | err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, | |
5524 | nlh->nlmsg_seq); | |
5525 | if (err < 0) | |
5526 | goto err; | |
5527 | ||
5528 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
5529 | err: | |
5530 | kfree_skb(skb2); | |
5531 | return err; | |
5532 | } | |
5533 | ||
96518518 PM |
5534 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
5535 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 5536 | .call_batch = nf_tables_newtable, |
96518518 PM |
5537 | .attr_count = NFTA_TABLE_MAX, |
5538 | .policy = nft_table_policy, | |
5539 | }, | |
5540 | [NFT_MSG_GETTABLE] = { | |
5541 | .call = nf_tables_gettable, | |
5542 | .attr_count = NFTA_TABLE_MAX, | |
5543 | .policy = nft_table_policy, | |
5544 | }, | |
5545 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 5546 | .call_batch = nf_tables_deltable, |
96518518 PM |
5547 | .attr_count = NFTA_TABLE_MAX, |
5548 | .policy = nft_table_policy, | |
5549 | }, | |
5550 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 5551 | .call_batch = nf_tables_newchain, |
96518518 PM |
5552 | .attr_count = NFTA_CHAIN_MAX, |
5553 | .policy = nft_chain_policy, | |
5554 | }, | |
5555 | [NFT_MSG_GETCHAIN] = { | |
5556 | .call = nf_tables_getchain, | |
5557 | .attr_count = NFTA_CHAIN_MAX, | |
5558 | .policy = nft_chain_policy, | |
5559 | }, | |
5560 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 5561 | .call_batch = nf_tables_delchain, |
96518518 PM |
5562 | .attr_count = NFTA_CHAIN_MAX, |
5563 | .policy = nft_chain_policy, | |
5564 | }, | |
5565 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 5566 | .call_batch = nf_tables_newrule, |
96518518 PM |
5567 | .attr_count = NFTA_RULE_MAX, |
5568 | .policy = nft_rule_policy, | |
5569 | }, | |
5570 | [NFT_MSG_GETRULE] = { | |
5571 | .call = nf_tables_getrule, | |
5572 | .attr_count = NFTA_RULE_MAX, | |
5573 | .policy = nft_rule_policy, | |
5574 | }, | |
5575 | [NFT_MSG_DELRULE] = { | |
0628b123 | 5576 | .call_batch = nf_tables_delrule, |
96518518 PM |
5577 | .attr_count = NFTA_RULE_MAX, |
5578 | .policy = nft_rule_policy, | |
5579 | }, | |
20a69341 | 5580 | [NFT_MSG_NEWSET] = { |
958bee14 | 5581 | .call_batch = nf_tables_newset, |
20a69341 PM |
5582 | .attr_count = NFTA_SET_MAX, |
5583 | .policy = nft_set_policy, | |
5584 | }, | |
5585 | [NFT_MSG_GETSET] = { | |
5586 | .call = nf_tables_getset, | |
5587 | .attr_count = NFTA_SET_MAX, | |
5588 | .policy = nft_set_policy, | |
5589 | }, | |
5590 | [NFT_MSG_DELSET] = { | |
958bee14 | 5591 | .call_batch = nf_tables_delset, |
20a69341 PM |
5592 | .attr_count = NFTA_SET_MAX, |
5593 | .policy = nft_set_policy, | |
5594 | }, | |
5595 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 5596 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
5597 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
5598 | .policy = nft_set_elem_list_policy, | |
5599 | }, | |
5600 | [NFT_MSG_GETSETELEM] = { | |
5601 | .call = nf_tables_getsetelem, | |
5602 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
5603 | .policy = nft_set_elem_list_policy, | |
5604 | }, | |
5605 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 5606 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
5607 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
5608 | .policy = nft_set_elem_list_policy, | |
5609 | }, | |
84d7fce6 PNA |
5610 | [NFT_MSG_GETGEN] = { |
5611 | .call = nf_tables_getgen, | |
5612 | }, | |
e5009240 PNA |
5613 | [NFT_MSG_NEWOBJ] = { |
5614 | .call_batch = nf_tables_newobj, | |
5615 | .attr_count = NFTA_OBJ_MAX, | |
5616 | .policy = nft_obj_policy, | |
5617 | }, | |
5618 | [NFT_MSG_GETOBJ] = { | |
5619 | .call = nf_tables_getobj, | |
5620 | .attr_count = NFTA_OBJ_MAX, | |
5621 | .policy = nft_obj_policy, | |
5622 | }, | |
5623 | [NFT_MSG_DELOBJ] = { | |
5624 | .call_batch = nf_tables_delobj, | |
5625 | .attr_count = NFTA_OBJ_MAX, | |
5626 | .policy = nft_obj_policy, | |
5627 | }, | |
43da04a5 PNA |
5628 | [NFT_MSG_GETOBJ_RESET] = { |
5629 | .call = nf_tables_getobj, | |
5630 | .attr_count = NFTA_OBJ_MAX, | |
5631 | .policy = nft_obj_policy, | |
5632 | }, | |
3b49e2e9 PNA |
5633 | [NFT_MSG_NEWFLOWTABLE] = { |
5634 | .call_batch = nf_tables_newflowtable, | |
5635 | .attr_count = NFTA_FLOWTABLE_MAX, | |
5636 | .policy = nft_flowtable_policy, | |
5637 | }, | |
5638 | [NFT_MSG_GETFLOWTABLE] = { | |
5639 | .call = nf_tables_getflowtable, | |
5640 | .attr_count = NFTA_FLOWTABLE_MAX, | |
5641 | .policy = nft_flowtable_policy, | |
5642 | }, | |
5643 | [NFT_MSG_DELFLOWTABLE] = { | |
5644 | .call_batch = nf_tables_delflowtable, | |
5645 | .attr_count = NFTA_FLOWTABLE_MAX, | |
5646 | .policy = nft_flowtable_policy, | |
5647 | }, | |
96518518 PM |
5648 | }; |
5649 | ||
91c7b38d PNA |
5650 | static void nft_chain_commit_update(struct nft_trans *trans) |
5651 | { | |
5652 | struct nft_base_chain *basechain; | |
5653 | ||
b7263e07 | 5654 | if (nft_trans_chain_name(trans)) |
91c7b38d PNA |
5655 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); |
5656 | ||
f323d954 | 5657 | if (!nft_is_base_chain(trans->ctx.chain)) |
91c7b38d PNA |
5658 | return; |
5659 | ||
5660 | basechain = nft_base_chain(trans->ctx.chain); | |
5661 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
5662 | ||
5663 | switch (nft_trans_chain_policy(trans)) { | |
5664 | case NF_DROP: | |
5665 | case NF_ACCEPT: | |
5666 | basechain->policy = nft_trans_chain_policy(trans); | |
5667 | break; | |
5668 | } | |
5669 | } | |
5670 | ||
b326dd37 | 5671 | static void nf_tables_commit_release(struct nft_trans *trans) |
c7c32e72 | 5672 | { |
c7c32e72 PNA |
5673 | switch (trans->msg_type) { |
5674 | case NFT_MSG_DELTABLE: | |
5675 | nf_tables_table_destroy(&trans->ctx); | |
5676 | break; | |
5677 | case NFT_MSG_DELCHAIN: | |
5678 | nf_tables_chain_destroy(trans->ctx.chain); | |
5679 | break; | |
5680 | case NFT_MSG_DELRULE: | |
5681 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
5682 | break; | |
5683 | case NFT_MSG_DELSET: | |
5684 | nft_set_destroy(nft_trans_set(trans)); | |
5685 | break; | |
61edafbb | 5686 | case NFT_MSG_DELSETELEM: |
59105446 PNA |
5687 | nf_tables_set_elem_destroy(nft_trans_elem_set(trans), |
5688 | nft_trans_elem(trans).priv); | |
61edafbb | 5689 | break; |
e5009240 PNA |
5690 | case NFT_MSG_DELOBJ: |
5691 | nft_obj_destroy(nft_trans_obj(trans)); | |
5692 | break; | |
3b49e2e9 PNA |
5693 | case NFT_MSG_DELFLOWTABLE: |
5694 | nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); | |
5695 | break; | |
c7c32e72 PNA |
5696 | } |
5697 | kfree(trans); | |
5698 | } | |
5699 | ||
5913beaf | 5700 | static int nf_tables_commit(struct net *net, struct sk_buff *skb) |
37082f93 | 5701 | { |
37082f93 | 5702 | struct nft_trans *trans, *next; |
a3716e70 | 5703 | struct nft_trans_elem *te; |
37082f93 PNA |
5704 | |
5705 | /* Bump generation counter, invalidate any dump in progress */ | |
38e029f1 | 5706 | while (++net->nft.base_seq == 0); |
37082f93 PNA |
5707 | |
5708 | /* A new generation has just started */ | |
ea4bd995 | 5709 | net->nft.gencursor = nft_gencursor_next(net); |
37082f93 PNA |
5710 | |
5711 | /* Make sure all packets have left the previous generation before | |
5712 | * purging old rules. | |
5713 | */ | |
5714 | synchronize_rcu(); | |
5715 | ||
5716 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 5717 | switch (trans->msg_type) { |
55dd6f93 PNA |
5718 | case NFT_MSG_NEWTABLE: |
5719 | if (nft_trans_table_update(trans)) { | |
5720 | if (!nft_trans_table_enable(trans)) { | |
664b0f8c | 5721 | nf_tables_table_disable(net, |
55dd6f93 PNA |
5722 | trans->ctx.table); |
5723 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
5724 | } | |
5725 | } else { | |
f2a6d766 | 5726 | nft_clear(net, trans->ctx.table); |
55dd6f93 | 5727 | } |
35151d84 | 5728 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
5729 | nft_trans_destroy(trans); |
5730 | break; | |
5731 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 5732 | list_del_rcu(&trans->ctx.table->list); |
35151d84 | 5733 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 5734 | break; |
91c7b38d PNA |
5735 | case NFT_MSG_NEWCHAIN: |
5736 | if (nft_trans_chain_update(trans)) | |
5737 | nft_chain_commit_update(trans); | |
4fefee57 | 5738 | else |
664b0f8c | 5739 | nft_clear(net, trans->ctx.chain); |
4fefee57 | 5740 | |
35151d84 | 5741 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
5742 | nft_trans_destroy(trans); |
5743 | break; | |
5744 | case NFT_MSG_DELCHAIN: | |
664b0f8c | 5745 | list_del_rcu(&trans->ctx.chain->list); |
35151d84 | 5746 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
c974a3a3 PNA |
5747 | nf_tables_unregister_hook(trans->ctx.net, |
5748 | trans->ctx.table, | |
5749 | trans->ctx.chain); | |
91c7b38d | 5750 | break; |
b380e5c7 | 5751 | case NFT_MSG_NEWRULE: |
889f7ee7 | 5752 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
35151d84 | 5753 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 5754 | nft_trans_rule(trans), |
35151d84 | 5755 | NFT_MSG_NEWRULE); |
37082f93 | 5756 | nft_trans_destroy(trans); |
b380e5c7 PNA |
5757 | break; |
5758 | case NFT_MSG_DELRULE: | |
5759 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
5760 | nf_tables_rule_notify(&trans->ctx, |
5761 | nft_trans_rule(trans), | |
5762 | NFT_MSG_DELRULE); | |
b380e5c7 | 5763 | break; |
958bee14 | 5764 | case NFT_MSG_NEWSET: |
37a9cc52 | 5765 | nft_clear(net, nft_trans_set(trans)); |
4fefee57 PNA |
5766 | /* This avoids hitting -EBUSY when deleting the table |
5767 | * from the transaction. | |
5768 | */ | |
408070d6 | 5769 | if (nft_set_is_anonymous(nft_trans_set(trans)) && |
4fefee57 PNA |
5770 | !list_empty(&nft_trans_set(trans)->bindings)) |
5771 | trans->ctx.table->use--; | |
5772 | ||
958bee14 | 5773 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 5774 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
5775 | nft_trans_destroy(trans); |
5776 | break; | |
5777 | case NFT_MSG_DELSET: | |
37a9cc52 | 5778 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 | 5779 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 5780 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 5781 | break; |
60319eb1 | 5782 | case NFT_MSG_NEWSETELEM: |
cc02e457 PM |
5783 | te = (struct nft_trans_elem *)trans->data; |
5784 | ||
42a55769 | 5785 | te->set->ops->activate(net, te->set, &te->elem); |
cc02e457 PM |
5786 | nf_tables_setelem_notify(&trans->ctx, te->set, |
5787 | &te->elem, | |
60319eb1 PNA |
5788 | NFT_MSG_NEWSETELEM, 0); |
5789 | nft_trans_destroy(trans); | |
5790 | break; | |
5791 | case NFT_MSG_DELSETELEM: | |
a3716e70 | 5792 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 5793 | |
a3716e70 PNA |
5794 | nf_tables_setelem_notify(&trans->ctx, te->set, |
5795 | &te->elem, | |
60319eb1 | 5796 | NFT_MSG_DELSETELEM, 0); |
5cb82a38 | 5797 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a PM |
5798 | atomic_dec(&te->set->nelems); |
5799 | te->set->ndeact--; | |
60319eb1 | 5800 | break; |
e5009240 PNA |
5801 | case NFT_MSG_NEWOBJ: |
5802 | nft_clear(net, nft_trans_obj(trans)); | |
5803 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
5804 | NFT_MSG_NEWOBJ); | |
5805 | nft_trans_destroy(trans); | |
5806 | break; | |
5807 | case NFT_MSG_DELOBJ: | |
5808 | list_del_rcu(&nft_trans_obj(trans)->list); | |
5809 | nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), | |
5810 | NFT_MSG_DELOBJ); | |
5811 | break; | |
3b49e2e9 PNA |
5812 | case NFT_MSG_NEWFLOWTABLE: |
5813 | nft_clear(net, nft_trans_flowtable(trans)); | |
5814 | nf_tables_flowtable_notify(&trans->ctx, | |
5815 | nft_trans_flowtable(trans), | |
5816 | NFT_MSG_NEWFLOWTABLE); | |
5817 | nft_trans_destroy(trans); | |
5818 | break; | |
5819 | case NFT_MSG_DELFLOWTABLE: | |
5820 | list_del_rcu(&nft_trans_flowtable(trans)->list); | |
5821 | nf_tables_flowtable_notify(&trans->ctx, | |
5822 | nft_trans_flowtable(trans), | |
5823 | NFT_MSG_DELFLOWTABLE); | |
5824 | nft_unregister_flowtable_net_hooks(net, | |
5825 | nft_trans_flowtable(trans)); | |
5826 | break; | |
37082f93 | 5827 | } |
37082f93 PNA |
5828 | } |
5829 | ||
b326dd37 PNA |
5830 | synchronize_rcu(); |
5831 | ||
37082f93 | 5832 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 | 5833 | list_del(&trans->list); |
b326dd37 | 5834 | nf_tables_commit_release(trans); |
37082f93 | 5835 | } |
84d7fce6 PNA |
5836 | |
5837 | nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); | |
37082f93 PNA |
5838 | |
5839 | return 0; | |
5840 | } | |
5841 | ||
b326dd37 | 5842 | static void nf_tables_abort_release(struct nft_trans *trans) |
c7c32e72 | 5843 | { |
c7c32e72 PNA |
5844 | switch (trans->msg_type) { |
5845 | case NFT_MSG_NEWTABLE: | |
5846 | nf_tables_table_destroy(&trans->ctx); | |
5847 | break; | |
5848 | case NFT_MSG_NEWCHAIN: | |
5849 | nf_tables_chain_destroy(trans->ctx.chain); | |
5850 | break; | |
5851 | case NFT_MSG_NEWRULE: | |
5852 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
5853 | break; | |
5854 | case NFT_MSG_NEWSET: | |
5855 | nft_set_destroy(nft_trans_set(trans)); | |
5856 | break; | |
61edafbb PM |
5857 | case NFT_MSG_NEWSETELEM: |
5858 | nft_set_elem_destroy(nft_trans_elem_set(trans), | |
61f9e292 | 5859 | nft_trans_elem(trans).priv, true); |
61edafbb | 5860 | break; |
e5009240 PNA |
5861 | case NFT_MSG_NEWOBJ: |
5862 | nft_obj_destroy(nft_trans_obj(trans)); | |
5863 | break; | |
3b49e2e9 PNA |
5864 | case NFT_MSG_NEWFLOWTABLE: |
5865 | nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); | |
5866 | break; | |
c7c32e72 PNA |
5867 | } |
5868 | kfree(trans); | |
5869 | } | |
5870 | ||
5913beaf | 5871 | static int nf_tables_abort(struct net *net, struct sk_buff *skb) |
37082f93 | 5872 | { |
37082f93 | 5873 | struct nft_trans *trans, *next; |
02263db0 | 5874 | struct nft_trans_elem *te; |
37082f93 | 5875 | |
a907e36d XL |
5876 | list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list, |
5877 | list) { | |
b380e5c7 | 5878 | switch (trans->msg_type) { |
55dd6f93 PNA |
5879 | case NFT_MSG_NEWTABLE: |
5880 | if (nft_trans_table_update(trans)) { | |
5881 | if (nft_trans_table_enable(trans)) { | |
664b0f8c | 5882 | nf_tables_table_disable(net, |
55dd6f93 PNA |
5883 | trans->ctx.table); |
5884 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
5885 | } | |
5886 | nft_trans_destroy(trans); | |
5887 | } else { | |
e688a7f8 | 5888 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
5889 | } |
5890 | break; | |
5891 | case NFT_MSG_DELTABLE: | |
f2a6d766 | 5892 | nft_clear(trans->ctx.net, trans->ctx.table); |
55dd6f93 PNA |
5893 | nft_trans_destroy(trans); |
5894 | break; | |
91c7b38d PNA |
5895 | case NFT_MSG_NEWCHAIN: |
5896 | if (nft_trans_chain_update(trans)) { | |
982f4051 | 5897 | free_percpu(nft_trans_chain_stats(trans)); |
91c7b38d PNA |
5898 | |
5899 | nft_trans_destroy(trans); | |
5900 | } else { | |
4fefee57 | 5901 | trans->ctx.table->use--; |
e688a7f8 | 5902 | list_del_rcu(&trans->ctx.chain->list); |
c974a3a3 PNA |
5903 | nf_tables_unregister_hook(trans->ctx.net, |
5904 | trans->ctx.table, | |
5905 | trans->ctx.chain); | |
91c7b38d PNA |
5906 | } |
5907 | break; | |
5908 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 5909 | trans->ctx.table->use++; |
664b0f8c | 5910 | nft_clear(trans->ctx.net, trans->ctx.chain); |
91c7b38d PNA |
5911 | nft_trans_destroy(trans); |
5912 | break; | |
b380e5c7 | 5913 | case NFT_MSG_NEWRULE: |
4fefee57 | 5914 | trans->ctx.chain->use--; |
b380e5c7 PNA |
5915 | list_del_rcu(&nft_trans_rule(trans)->list); |
5916 | break; | |
5917 | case NFT_MSG_DELRULE: | |
4fefee57 | 5918 | trans->ctx.chain->use++; |
889f7ee7 | 5919 | nft_clear(trans->ctx.net, nft_trans_rule(trans)); |
37082f93 | 5920 | nft_trans_destroy(trans); |
b380e5c7 | 5921 | break; |
958bee14 | 5922 | case NFT_MSG_NEWSET: |
4fefee57 | 5923 | trans->ctx.table->use--; |
e688a7f8 | 5924 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
5925 | break; |
5926 | case NFT_MSG_DELSET: | |
4fefee57 | 5927 | trans->ctx.table->use++; |
37a9cc52 | 5928 | nft_clear(trans->ctx.net, nft_trans_set(trans)); |
958bee14 PNA |
5929 | nft_trans_destroy(trans); |
5930 | break; | |
60319eb1 | 5931 | case NFT_MSG_NEWSETELEM: |
02263db0 | 5932 | te = (struct nft_trans_elem *)trans->data; |
fe2811eb | 5933 | |
5cb82a38 | 5934 | te->set->ops->remove(net, te->set, &te->elem); |
3dd0673a | 5935 | atomic_dec(&te->set->nelems); |
60319eb1 PNA |
5936 | break; |
5937 | case NFT_MSG_DELSETELEM: | |
cc02e457 PM |
5938 | te = (struct nft_trans_elem *)trans->data; |
5939 | ||
59105446 | 5940 | nft_set_elem_activate(net, te->set, &te->elem); |
42a55769 | 5941 | te->set->ops->activate(net, te->set, &te->elem); |
3dd0673a | 5942 | te->set->ndeact--; |
cc02e457 | 5943 | |
e5009240 PNA |
5944 | nft_trans_destroy(trans); |
5945 | break; | |
5946 | case NFT_MSG_NEWOBJ: | |
5947 | trans->ctx.table->use--; | |
5948 | list_del_rcu(&nft_trans_obj(trans)->list); | |
5949 | break; | |
5950 | case NFT_MSG_DELOBJ: | |
5951 | trans->ctx.table->use++; | |
5952 | nft_clear(trans->ctx.net, nft_trans_obj(trans)); | |
60319eb1 PNA |
5953 | nft_trans_destroy(trans); |
5954 | break; | |
3b49e2e9 PNA |
5955 | case NFT_MSG_NEWFLOWTABLE: |
5956 | trans->ctx.table->use--; | |
5957 | list_del_rcu(&nft_trans_flowtable(trans)->list); | |
5958 | nft_unregister_flowtable_net_hooks(net, | |
5959 | nft_trans_flowtable(trans)); | |
5960 | break; | |
5961 | case NFT_MSG_DELFLOWTABLE: | |
5962 | trans->ctx.table->use++; | |
5963 | nft_clear(trans->ctx.net, nft_trans_flowtable(trans)); | |
5964 | nft_trans_destroy(trans); | |
5965 | break; | |
37082f93 | 5966 | } |
37082f93 PNA |
5967 | } |
5968 | ||
b326dd37 PNA |
5969 | synchronize_rcu(); |
5970 | ||
a1cee076 PNA |
5971 | list_for_each_entry_safe_reverse(trans, next, |
5972 | &net->nft.commit_list, list) { | |
c7c32e72 | 5973 | list_del(&trans->list); |
b326dd37 | 5974 | nf_tables_abort_release(trans); |
37082f93 PNA |
5975 | } |
5976 | ||
5977 | return 0; | |
5978 | } | |
5979 | ||
74e8bcd2 PNA |
5980 | static bool nf_tables_valid_genid(struct net *net, u32 genid) |
5981 | { | |
5982 | return net->nft.base_seq == genid; | |
5983 | } | |
5984 | ||
96518518 PM |
5985 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
5986 | .name = "nf_tables", | |
5987 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
5988 | .cb_count = NFT_MSG_MAX, | |
5989 | .cb = nf_tables_cb, | |
0628b123 PNA |
5990 | .commit = nf_tables_commit, |
5991 | .abort = nf_tables_abort, | |
74e8bcd2 | 5992 | .valid_genid = nf_tables_valid_genid, |
96518518 PM |
5993 | }; |
5994 | ||
7210e4e3 PNA |
5995 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
5996 | enum nft_chain_type type) | |
5997 | { | |
5998 | const struct nft_base_chain *basechain; | |
5999 | ||
f323d954 | 6000 | if (nft_is_base_chain(chain)) { |
7210e4e3 PNA |
6001 | basechain = nft_base_chain(chain); |
6002 | if (basechain->type->type != type) | |
6003 | return -EOPNOTSUPP; | |
6004 | } | |
6005 | return 0; | |
6006 | } | |
6007 | EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); | |
6008 | ||
75e8d06d PNA |
6009 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
6010 | unsigned int hook_flags) | |
6011 | { | |
6012 | struct nft_base_chain *basechain; | |
6013 | ||
f323d954 | 6014 | if (nft_is_base_chain(chain)) { |
75e8d06d PNA |
6015 | basechain = nft_base_chain(chain); |
6016 | ||
c974a3a3 | 6017 | if ((1 << basechain->ops.hooknum) & hook_flags) |
75e8d06d PNA |
6018 | return 0; |
6019 | ||
6020 | return -EOPNOTSUPP; | |
6021 | } | |
6022 | ||
6023 | return 0; | |
6024 | } | |
6025 | EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); | |
6026 | ||
20a69341 PM |
6027 | /* |
6028 | * Loop detection - walk through the ruleset beginning at the destination chain | |
6029 | * of a new jump until either the source chain is reached (loop) or all | |
6030 | * reachable chains have been traversed. | |
6031 | * | |
6032 | * The loop check is performed whenever a new jump verdict is added to an | |
6033 | * expression or verdict map or a verdict map is bound to a new chain. | |
6034 | */ | |
6035 | ||
6036 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
6037 | const struct nft_chain *chain); | |
6038 | ||
6039 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
de70185d | 6040 | struct nft_set *set, |
20a69341 | 6041 | const struct nft_set_iter *iter, |
de70185d | 6042 | struct nft_set_elem *elem) |
20a69341 | 6043 | { |
fe2811eb PM |
6044 | const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); |
6045 | const struct nft_data *data; | |
6046 | ||
6047 | if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && | |
6048 | *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) | |
62f9c8b4 PNA |
6049 | return 0; |
6050 | ||
fe2811eb | 6051 | data = nft_set_ext_data(ext); |
1ca2e170 | 6052 | switch (data->verdict.code) { |
20a69341 PM |
6053 | case NFT_JUMP: |
6054 | case NFT_GOTO: | |
1ca2e170 | 6055 | return nf_tables_check_loops(ctx, data->verdict.chain); |
20a69341 PM |
6056 | default: |
6057 | return 0; | |
6058 | } | |
6059 | } | |
6060 | ||
6061 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
6062 | const struct nft_chain *chain) | |
6063 | { | |
6064 | const struct nft_rule *rule; | |
6065 | const struct nft_expr *expr, *last; | |
de70185d | 6066 | struct nft_set *set; |
20a69341 PM |
6067 | struct nft_set_binding *binding; |
6068 | struct nft_set_iter iter; | |
20a69341 PM |
6069 | |
6070 | if (ctx->chain == chain) | |
6071 | return -ELOOP; | |
6072 | ||
6073 | list_for_each_entry(rule, &chain->rules, list) { | |
6074 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
6075 | const struct nft_data *data = NULL; |
6076 | int err; | |
6077 | ||
6078 | if (!expr->ops->validate) | |
20a69341 PM |
6079 | continue; |
6080 | ||
0ca743a5 PNA |
6081 | err = expr->ops->validate(ctx, expr, &data); |
6082 | if (err < 0) | |
6083 | return err; | |
6084 | ||
20a69341 | 6085 | if (data == NULL) |
0ca743a5 | 6086 | continue; |
20a69341 | 6087 | |
1ca2e170 | 6088 | switch (data->verdict.code) { |
20a69341 PM |
6089 | case NFT_JUMP: |
6090 | case NFT_GOTO: | |
1ca2e170 PM |
6091 | err = nf_tables_check_loops(ctx, |
6092 | data->verdict.chain); | |
20a69341 PM |
6093 | if (err < 0) |
6094 | return err; | |
6095 | default: | |
6096 | break; | |
6097 | } | |
6098 | } | |
6099 | } | |
6100 | ||
6101 | list_for_each_entry(set, &ctx->table->sets, list) { | |
37a9cc52 PNA |
6102 | if (!nft_is_active_next(ctx->net, set)) |
6103 | continue; | |
20a69341 PM |
6104 | if (!(set->flags & NFT_SET_MAP) || |
6105 | set->dtype != NFT_DATA_VERDICT) | |
6106 | continue; | |
6107 | ||
6108 | list_for_each_entry(binding, &set->bindings, list) { | |
11113e19 PM |
6109 | if (!(binding->flags & NFT_SET_MAP) || |
6110 | binding->chain != chain) | |
20a69341 PM |
6111 | continue; |
6112 | ||
8588ac09 | 6113 | iter.genmask = nft_genmask_next(ctx->net); |
20a69341 PM |
6114 | iter.skip = 0; |
6115 | iter.count = 0; | |
6116 | iter.err = 0; | |
6117 | iter.fn = nf_tables_loop_check_setelem; | |
6118 | ||
6119 | set->ops->walk(ctx, set, &iter); | |
6120 | if (iter.err < 0) | |
6121 | return iter.err; | |
6122 | } | |
6123 | } | |
6124 | ||
6125 | return 0; | |
6126 | } | |
6127 | ||
36b701fa LGL |
6128 | /** |
6129 | * nft_parse_u32_check - fetch u32 attribute and check for maximum value | |
6130 | * | |
6131 | * @attr: netlink attribute to fetch value from | |
6132 | * @max: maximum value to be stored in dest | |
6133 | * @dest: pointer to the variable | |
6134 | * | |
6135 | * Parse, check and store a given u32 netlink attribute into variable. | |
6136 | * This function returns -ERANGE if the value goes over maximum value. | |
6137 | * Otherwise a 0 is returned and the attribute value is stored in the | |
6138 | * destination variable. | |
6139 | */ | |
f1d505bb | 6140 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) |
36b701fa | 6141 | { |
09525a09 | 6142 | u32 val; |
36b701fa LGL |
6143 | |
6144 | val = ntohl(nla_get_be32(attr)); | |
6145 | if (val > max) | |
6146 | return -ERANGE; | |
6147 | ||
6148 | *dest = val; | |
6149 | return 0; | |
6150 | } | |
6151 | EXPORT_SYMBOL_GPL(nft_parse_u32_check); | |
6152 | ||
49499c3e PM |
6153 | /** |
6154 | * nft_parse_register - parse a register value from a netlink attribute | |
6155 | * | |
6156 | * @attr: netlink attribute | |
6157 | * | |
6158 | * Parse and translate a register value from a netlink attribute. | |
6159 | * Registers used to be 128 bit wide, these register numbers will be | |
6160 | * mapped to the corresponding 32 bit register numbers. | |
6161 | */ | |
b1c96ed3 PM |
6162 | unsigned int nft_parse_register(const struct nlattr *attr) |
6163 | { | |
49499c3e PM |
6164 | unsigned int reg; |
6165 | ||
6166 | reg = ntohl(nla_get_be32(attr)); | |
6167 | switch (reg) { | |
6168 | case NFT_REG_VERDICT...NFT_REG_4: | |
6169 | return reg * NFT_REG_SIZE / NFT_REG32_SIZE; | |
6170 | default: | |
6171 | return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; | |
6172 | } | |
b1c96ed3 PM |
6173 | } |
6174 | EXPORT_SYMBOL_GPL(nft_parse_register); | |
6175 | ||
49499c3e PM |
6176 | /** |
6177 | * nft_dump_register - dump a register value to a netlink attribute | |
6178 | * | |
6179 | * @skb: socket buffer | |
6180 | * @attr: attribute number | |
6181 | * @reg: register number | |
6182 | * | |
6183 | * Construct a netlink attribute containing the register number. For | |
6184 | * compatibility reasons, register numbers being a multiple of 4 are | |
6185 | * translated to the corresponding 128 bit register numbers. | |
6186 | */ | |
b1c96ed3 PM |
6187 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) |
6188 | { | |
49499c3e PM |
6189 | if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) |
6190 | reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); | |
6191 | else | |
6192 | reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; | |
6193 | ||
b1c96ed3 PM |
6194 | return nla_put_be32(skb, attr, htonl(reg)); |
6195 | } | |
6196 | EXPORT_SYMBOL_GPL(nft_dump_register); | |
6197 | ||
96518518 | 6198 | /** |
d07db988 | 6199 | * nft_validate_register_load - validate a load from a register |
96518518 PM |
6200 | * |
6201 | * @reg: the register number | |
d07db988 | 6202 | * @len: the length of the data |
96518518 PM |
6203 | * |
6204 | * Validate that the input register is one of the general purpose | |
d07db988 | 6205 | * registers and that the length of the load is within the bounds. |
96518518 | 6206 | */ |
d07db988 | 6207 | int nft_validate_register_load(enum nft_registers reg, unsigned int len) |
96518518 | 6208 | { |
49499c3e | 6209 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
96518518 | 6210 | return -EINVAL; |
d07db988 PM |
6211 | if (len == 0) |
6212 | return -EINVAL; | |
49499c3e | 6213 | if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data)) |
d07db988 | 6214 | return -ERANGE; |
49499c3e | 6215 | |
96518518 PM |
6216 | return 0; |
6217 | } | |
d07db988 | 6218 | EXPORT_SYMBOL_GPL(nft_validate_register_load); |
96518518 | 6219 | |
96518518 | 6220 | /** |
1ec10212 | 6221 | * nft_validate_register_store - validate an expressions' register store |
96518518 PM |
6222 | * |
6223 | * @ctx: context of the expression performing the load | |
6224 | * @reg: the destination register number | |
6225 | * @data: the data to load | |
6226 | * @type: the data type | |
45d9bcda | 6227 | * @len: the length of the data |
96518518 PM |
6228 | * |
6229 | * Validate that a data load uses the appropriate data type for | |
45d9bcda PM |
6230 | * the destination register and the length is within the bounds. |
6231 | * A value of NULL for the data means that its runtime gathered | |
58f40ab6 | 6232 | * data. |
96518518 | 6233 | */ |
1ec10212 PM |
6234 | int nft_validate_register_store(const struct nft_ctx *ctx, |
6235 | enum nft_registers reg, | |
6236 | const struct nft_data *data, | |
6237 | enum nft_data_types type, unsigned int len) | |
96518518 | 6238 | { |
20a69341 PM |
6239 | int err; |
6240 | ||
96518518 PM |
6241 | switch (reg) { |
6242 | case NFT_REG_VERDICT: | |
58f40ab6 | 6243 | if (type != NFT_DATA_VERDICT) |
96518518 | 6244 | return -EINVAL; |
20a69341 | 6245 | |
58f40ab6 | 6246 | if (data != NULL && |
1ca2e170 PM |
6247 | (data->verdict.code == NFT_GOTO || |
6248 | data->verdict.code == NFT_JUMP)) { | |
6249 | err = nf_tables_check_loops(ctx, data->verdict.chain); | |
20a69341 PM |
6250 | if (err < 0) |
6251 | return err; | |
6252 | ||
1ca2e170 PM |
6253 | if (ctx->chain->level + 1 > |
6254 | data->verdict.chain->level) { | |
20a69341 PM |
6255 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
6256 | return -EMLINK; | |
1ca2e170 | 6257 | data->verdict.chain->level = ctx->chain->level + 1; |
20a69341 PM |
6258 | } |
6259 | } | |
6260 | ||
96518518 PM |
6261 | return 0; |
6262 | default: | |
49499c3e | 6263 | if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) |
27e6d201 | 6264 | return -EINVAL; |
45d9bcda PM |
6265 | if (len == 0) |
6266 | return -EINVAL; | |
49499c3e PM |
6267 | if (reg * NFT_REG32_SIZE + len > |
6268 | FIELD_SIZEOF(struct nft_regs, data)) | |
45d9bcda | 6269 | return -ERANGE; |
27e6d201 | 6270 | |
96518518 PM |
6271 | if (data != NULL && type != NFT_DATA_VALUE) |
6272 | return -EINVAL; | |
6273 | return 0; | |
6274 | } | |
6275 | } | |
1ec10212 | 6276 | EXPORT_SYMBOL_GPL(nft_validate_register_store); |
96518518 PM |
6277 | |
6278 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
6279 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
6280 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
6281 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
6282 | }; | |
6283 | ||
6284 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
6285 | struct nft_data_desc *desc, const struct nlattr *nla) | |
6286 | { | |
664b0f8c | 6287 | u8 genmask = nft_genmask_next(ctx->net); |
96518518 PM |
6288 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
6289 | struct nft_chain *chain; | |
6290 | int err; | |
6291 | ||
fceb6435 JB |
6292 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy, |
6293 | NULL); | |
96518518 PM |
6294 | if (err < 0) |
6295 | return err; | |
6296 | ||
6297 | if (!tb[NFTA_VERDICT_CODE]) | |
6298 | return -EINVAL; | |
1ca2e170 | 6299 | data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
96518518 | 6300 | |
1ca2e170 | 6301 | switch (data->verdict.code) { |
e0abdadc | 6302 | default: |
1ca2e170 | 6303 | switch (data->verdict.code & NF_VERDICT_MASK) { |
e0abdadc PM |
6304 | case NF_ACCEPT: |
6305 | case NF_DROP: | |
6306 | case NF_QUEUE: | |
6307 | break; | |
6308 | default: | |
6309 | return -EINVAL; | |
6310 | } | |
6311 | /* fall through */ | |
96518518 PM |
6312 | case NFT_CONTINUE: |
6313 | case NFT_BREAK: | |
6314 | case NFT_RETURN: | |
96518518 PM |
6315 | break; |
6316 | case NFT_JUMP: | |
6317 | case NFT_GOTO: | |
6318 | if (!tb[NFTA_VERDICT_CHAIN]) | |
6319 | return -EINVAL; | |
6320 | chain = nf_tables_chain_lookup(ctx->table, | |
664b0f8c | 6321 | tb[NFTA_VERDICT_CHAIN], genmask); |
96518518 PM |
6322 | if (IS_ERR(chain)) |
6323 | return PTR_ERR(chain); | |
f323d954 | 6324 | if (nft_is_base_chain(chain)) |
96518518 PM |
6325 | return -EOPNOTSUPP; |
6326 | ||
96518518 | 6327 | chain->use++; |
1ca2e170 | 6328 | data->verdict.chain = chain; |
96518518 | 6329 | break; |
96518518 PM |
6330 | } |
6331 | ||
4c4ed074 | 6332 | desc->len = sizeof(data->verdict); |
96518518 PM |
6333 | desc->type = NFT_DATA_VERDICT; |
6334 | return 0; | |
6335 | } | |
6336 | ||
6337 | static void nft_verdict_uninit(const struct nft_data *data) | |
6338 | { | |
1ca2e170 | 6339 | switch (data->verdict.code) { |
96518518 PM |
6340 | case NFT_JUMP: |
6341 | case NFT_GOTO: | |
1ca2e170 | 6342 | data->verdict.chain->use--; |
96518518 PM |
6343 | break; |
6344 | } | |
6345 | } | |
6346 | ||
33d5a7b1 | 6347 | int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) |
96518518 PM |
6348 | { |
6349 | struct nlattr *nest; | |
6350 | ||
33d5a7b1 | 6351 | nest = nla_nest_start(skb, type); |
96518518 PM |
6352 | if (!nest) |
6353 | goto nla_put_failure; | |
6354 | ||
33d5a7b1 | 6355 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) |
96518518 PM |
6356 | goto nla_put_failure; |
6357 | ||
33d5a7b1 | 6358 | switch (v->code) { |
96518518 PM |
6359 | case NFT_JUMP: |
6360 | case NFT_GOTO: | |
1ca2e170 | 6361 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, |
33d5a7b1 | 6362 | v->chain->name)) |
96518518 PM |
6363 | goto nla_put_failure; |
6364 | } | |
6365 | nla_nest_end(skb, nest); | |
6366 | return 0; | |
6367 | ||
6368 | nla_put_failure: | |
6369 | return -1; | |
6370 | } | |
6371 | ||
d0a11fc3 PM |
6372 | static int nft_value_init(const struct nft_ctx *ctx, |
6373 | struct nft_data *data, unsigned int size, | |
96518518 PM |
6374 | struct nft_data_desc *desc, const struct nlattr *nla) |
6375 | { | |
6376 | unsigned int len; | |
6377 | ||
6378 | len = nla_len(nla); | |
6379 | if (len == 0) | |
6380 | return -EINVAL; | |
d0a11fc3 | 6381 | if (len > size) |
96518518 PM |
6382 | return -EOVERFLOW; |
6383 | ||
d0a11fc3 | 6384 | nla_memcpy(data->data, nla, len); |
96518518 PM |
6385 | desc->type = NFT_DATA_VALUE; |
6386 | desc->len = len; | |
6387 | return 0; | |
6388 | } | |
6389 | ||
6390 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
6391 | unsigned int len) | |
6392 | { | |
6393 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
6394 | } | |
6395 | ||
6396 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
d0a11fc3 | 6397 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, |
96518518 PM |
6398 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
6399 | }; | |
6400 | ||
6401 | /** | |
6402 | * nft_data_init - parse nf_tables data netlink attributes | |
6403 | * | |
6404 | * @ctx: context of the expression using the data | |
6405 | * @data: destination struct nft_data | |
d0a11fc3 | 6406 | * @size: maximum data length |
96518518 PM |
6407 | * @desc: data description |
6408 | * @nla: netlink attribute containing data | |
6409 | * | |
6410 | * Parse the netlink data attributes and initialize a struct nft_data. | |
6411 | * The type and length of data are returned in the data description. | |
6412 | * | |
6413 | * The caller can indicate that it only wants to accept data of type | |
6414 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
6415 | */ | |
d0a11fc3 PM |
6416 | int nft_data_init(const struct nft_ctx *ctx, |
6417 | struct nft_data *data, unsigned int size, | |
96518518 PM |
6418 | struct nft_data_desc *desc, const struct nlattr *nla) |
6419 | { | |
6420 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
6421 | int err; | |
6422 | ||
fceb6435 | 6423 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL); |
96518518 PM |
6424 | if (err < 0) |
6425 | return err; | |
6426 | ||
6427 | if (tb[NFTA_DATA_VALUE]) | |
d0a11fc3 PM |
6428 | return nft_value_init(ctx, data, size, desc, |
6429 | tb[NFTA_DATA_VALUE]); | |
96518518 PM |
6430 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
6431 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
6432 | return -EINVAL; | |
6433 | } | |
6434 | EXPORT_SYMBOL_GPL(nft_data_init); | |
6435 | ||
6436 | /** | |
59105446 | 6437 | * nft_data_release - release a nft_data item |
96518518 PM |
6438 | * |
6439 | * @data: struct nft_data to release | |
6440 | * @type: type of data | |
6441 | * | |
6442 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
6443 | * all others need to be released by calling this function. | |
6444 | */ | |
59105446 | 6445 | void nft_data_release(const struct nft_data *data, enum nft_data_types type) |
96518518 | 6446 | { |
960bd2c2 | 6447 | if (type < NFT_DATA_VERDICT) |
96518518 | 6448 | return; |
960bd2c2 | 6449 | switch (type) { |
96518518 PM |
6450 | case NFT_DATA_VERDICT: |
6451 | return nft_verdict_uninit(data); | |
6452 | default: | |
6453 | WARN_ON(1); | |
6454 | } | |
6455 | } | |
59105446 | 6456 | EXPORT_SYMBOL_GPL(nft_data_release); |
96518518 PM |
6457 | |
6458 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
6459 | enum nft_data_types type, unsigned int len) | |
6460 | { | |
6461 | struct nlattr *nest; | |
6462 | int err; | |
6463 | ||
6464 | nest = nla_nest_start(skb, attr); | |
6465 | if (nest == NULL) | |
6466 | return -1; | |
6467 | ||
6468 | switch (type) { | |
6469 | case NFT_DATA_VALUE: | |
6470 | err = nft_value_dump(skb, data, len); | |
6471 | break; | |
6472 | case NFT_DATA_VERDICT: | |
33d5a7b1 | 6473 | err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); |
96518518 PM |
6474 | break; |
6475 | default: | |
6476 | err = -EINVAL; | |
6477 | WARN_ON(1); | |
6478 | } | |
6479 | ||
6480 | nla_nest_end(skb, nest); | |
6481 | return err; | |
6482 | } | |
6483 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
6484 | ||
5ebe0b0e PNA |
6485 | int __nft_release_basechain(struct nft_ctx *ctx) |
6486 | { | |
6487 | struct nft_rule *rule, *nr; | |
6488 | ||
f323d954 | 6489 | BUG_ON(!nft_is_base_chain(ctx->chain)); |
5ebe0b0e | 6490 | |
c974a3a3 | 6491 | nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain); |
5ebe0b0e PNA |
6492 | list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { |
6493 | list_del(&rule->list); | |
6494 | ctx->chain->use--; | |
6495 | nf_tables_rule_destroy(ctx, rule); | |
6496 | } | |
6497 | list_del(&ctx->chain->list); | |
6498 | ctx->table->use--; | |
6499 | nf_tables_chain_destroy(ctx->chain); | |
6500 | ||
6501 | return 0; | |
6502 | } | |
6503 | EXPORT_SYMBOL_GPL(__nft_release_basechain); | |
6504 | ||
98319cb9 | 6505 | static void __nft_release_tables(struct net *net) |
df05ef87 | 6506 | { |
3b49e2e9 | 6507 | struct nft_flowtable *flowtable, *nf; |
df05ef87 PNA |
6508 | struct nft_table *table, *nt; |
6509 | struct nft_chain *chain, *nc; | |
e5009240 | 6510 | struct nft_object *obj, *ne; |
df05ef87 PNA |
6511 | struct nft_rule *rule, *nr; |
6512 | struct nft_set *set, *ns; | |
6513 | struct nft_ctx ctx = { | |
6514 | .net = net, | |
df05ef87 PNA |
6515 | }; |
6516 | ||
36596dad | 6517 | list_for_each_entry_safe(table, nt, &net->nft.tables, list) { |
98319cb9 | 6518 | ctx.family = table->family; |
dd4cbef7 | 6519 | |
df05ef87 | 6520 | list_for_each_entry(chain, &table->chains, list) |
c974a3a3 | 6521 | nf_tables_unregister_hook(net, table, chain); |
3b49e2e9 PNA |
6522 | list_for_each_entry(flowtable, &table->flowtables, list) |
6523 | nf_unregister_net_hooks(net, flowtable->ops, | |
6524 | flowtable->ops_len); | |
df05ef87 PNA |
6525 | /* No packets are walking on these chains anymore. */ |
6526 | ctx.table = table; | |
6527 | list_for_each_entry(chain, &table->chains, list) { | |
6528 | ctx.chain = chain; | |
6529 | list_for_each_entry_safe(rule, nr, &chain->rules, list) { | |
6530 | list_del(&rule->list); | |
6531 | chain->use--; | |
6532 | nf_tables_rule_destroy(&ctx, rule); | |
6533 | } | |
6534 | } | |
3b49e2e9 PNA |
6535 | list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) { |
6536 | list_del(&flowtable->list); | |
6537 | table->use--; | |
6538 | nf_tables_flowtable_destroy(flowtable); | |
6539 | } | |
df05ef87 PNA |
6540 | list_for_each_entry_safe(set, ns, &table->sets, list) { |
6541 | list_del(&set->list); | |
6542 | table->use--; | |
6543 | nft_set_destroy(set); | |
6544 | } | |
e5009240 PNA |
6545 | list_for_each_entry_safe(obj, ne, &table->objects, list) { |
6546 | list_del(&obj->list); | |
6547 | table->use--; | |
6548 | nft_obj_destroy(obj); | |
6549 | } | |
df05ef87 PNA |
6550 | list_for_each_entry_safe(chain, nc, &table->chains, list) { |
6551 | list_del(&chain->list); | |
6552 | table->use--; | |
6553 | nf_tables_chain_destroy(chain); | |
6554 | } | |
6555 | list_del(&table->list); | |
6556 | nf_tables_table_destroy(&ctx); | |
6557 | } | |
6558 | } | |
6559 | ||
dd4cbef7 PNA |
6560 | static int __net_init nf_tables_init_net(struct net *net) |
6561 | { | |
6562 | INIT_LIST_HEAD(&net->nft.tables); | |
6563 | INIT_LIST_HEAD(&net->nft.commit_list); | |
6564 | net->nft.base_seq = 1; | |
6565 | return 0; | |
6566 | } | |
6567 | ||
6568 | static void __net_exit nf_tables_exit_net(struct net *net) | |
6569 | { | |
98319cb9 | 6570 | __nft_release_tables(net); |
dd4cbef7 PNA |
6571 | WARN_ON_ONCE(!list_empty(&net->nft.tables)); |
6572 | WARN_ON_ONCE(!list_empty(&net->nft.commit_list)); | |
6573 | } | |
6574 | ||
99633ab2 PNA |
6575 | static struct pernet_operations nf_tables_net_ops = { |
6576 | .init = nf_tables_init_net, | |
613d0776 | 6577 | .exit = nf_tables_exit_net, |
99633ab2 PNA |
6578 | }; |
6579 | ||
96518518 PM |
6580 | static int __init nf_tables_module_init(void) |
6581 | { | |
6582 | int err; | |
6583 | ||
6584 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
6585 | GFP_KERNEL); | |
6586 | if (info == NULL) { | |
6587 | err = -ENOMEM; | |
6588 | goto err1; | |
6589 | } | |
6590 | ||
6591 | err = nf_tables_core_module_init(); | |
6592 | if (err < 0) | |
6593 | goto err2; | |
6594 | ||
6595 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
6596 | if (err < 0) | |
6597 | goto err3; | |
6598 | ||
3b49e2e9 PNA |
6599 | register_netdevice_notifier(&nf_tables_flowtable_notifier); |
6600 | ||
99633ab2 | 6601 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
6602 | err3: |
6603 | nf_tables_core_module_exit(); | |
6604 | err2: | |
6605 | kfree(info); | |
6606 | err1: | |
6607 | return err; | |
6608 | } | |
6609 | ||
6610 | static void __exit nf_tables_module_exit(void) | |
6611 | { | |
99633ab2 | 6612 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 | 6613 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
3b49e2e9 | 6614 | unregister_netdevice_notifier(&nf_tables_flowtable_notifier); |
1b1bc49c | 6615 | rcu_barrier(); |
96518518 PM |
6616 | nf_tables_core_module_exit(); |
6617 | kfree(info); | |
6618 | } | |
6619 | ||
6620 | module_init(nf_tables_module_init); | |
6621 | module_exit(nf_tables_module_exit); | |
6622 | ||
6623 | MODULE_LICENSE("GPL"); | |
6624 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
6625 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |