Commit | Line | Data |
---|---|---|
96518518 | 1 | /* |
20a69341 | 2 | * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netlink.h> | |
16 | #include <linux/netfilter.h> | |
17 | #include <linux/netfilter/nfnetlink.h> | |
18 | #include <linux/netfilter/nf_tables.h> | |
19 | #include <net/netfilter/nf_tables_core.h> | |
20 | #include <net/netfilter/nf_tables.h> | |
21 | #include <net/sock.h> | |
22 | ||
23 | static LIST_HEAD(nf_tables_afinfo); | |
24 | static LIST_HEAD(nf_tables_expressions); | |
25 | ||
26 | /** | |
27 | * nft_register_afinfo - register nf_tables address family info | |
28 | * | |
29 | * @afi: address family info to register | |
30 | * | |
31 | * Register the address family for use with nf_tables. Returns zero on | |
32 | * success or a negative errno code otherwise. | |
33 | */ | |
34 | int nft_register_afinfo(struct nft_af_info *afi) | |
35 | { | |
36 | INIT_LIST_HEAD(&afi->tables); | |
37 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
38 | list_add_tail(&afi->list, &nf_tables_afinfo); | |
39 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
40 | return 0; | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(nft_register_afinfo); | |
43 | ||
44 | /** | |
45 | * nft_unregister_afinfo - unregister nf_tables address family info | |
46 | * | |
47 | * @afi: address family info to unregister | |
48 | * | |
49 | * Unregister the address family for use with nf_tables. | |
50 | */ | |
51 | void nft_unregister_afinfo(struct nft_af_info *afi) | |
52 | { | |
53 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
54 | list_del(&afi->list); | |
55 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
56 | } | |
57 | EXPORT_SYMBOL_GPL(nft_unregister_afinfo); | |
58 | ||
59 | static struct nft_af_info *nft_afinfo_lookup(int family) | |
60 | { | |
61 | struct nft_af_info *afi; | |
62 | ||
63 | list_for_each_entry(afi, &nf_tables_afinfo, list) { | |
64 | if (afi->family == family) | |
65 | return afi; | |
66 | } | |
67 | return NULL; | |
68 | } | |
69 | ||
70 | static struct nft_af_info *nf_tables_afinfo_lookup(int family, bool autoload) | |
71 | { | |
72 | struct nft_af_info *afi; | |
73 | ||
74 | afi = nft_afinfo_lookup(family); | |
75 | if (afi != NULL) | |
76 | return afi; | |
77 | #ifdef CONFIG_MODULES | |
78 | if (autoload) { | |
79 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
80 | request_module("nft-afinfo-%u", family); | |
81 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
82 | afi = nft_afinfo_lookup(family); | |
83 | if (afi != NULL) | |
84 | return ERR_PTR(-EAGAIN); | |
85 | } | |
86 | #endif | |
87 | return ERR_PTR(-EAFNOSUPPORT); | |
88 | } | |
89 | ||
90 | /* | |
91 | * Tables | |
92 | */ | |
93 | ||
94 | static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, | |
95 | const struct nlattr *nla) | |
96 | { | |
97 | struct nft_table *table; | |
98 | ||
99 | list_for_each_entry(table, &afi->tables, list) { | |
100 | if (!nla_strcmp(nla, table->name)) | |
101 | return table; | |
102 | } | |
103 | return NULL; | |
104 | } | |
105 | ||
106 | static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, | |
9370761c | 107 | const struct nlattr *nla) |
96518518 PM |
108 | { |
109 | struct nft_table *table; | |
110 | ||
111 | if (nla == NULL) | |
112 | return ERR_PTR(-EINVAL); | |
113 | ||
114 | table = nft_table_lookup(afi, nla); | |
115 | if (table != NULL) | |
116 | return table; | |
117 | ||
96518518 PM |
118 | return ERR_PTR(-ENOENT); |
119 | } | |
120 | ||
121 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) | |
122 | { | |
123 | return ++table->hgenerator; | |
124 | } | |
125 | ||
9370761c PNA |
126 | static struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX]; |
127 | ||
128 | static int __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) | |
129 | { | |
130 | int i; | |
131 | ||
132 | for (i=0; i<NFT_CHAIN_T_MAX; i++) { | |
133 | if (chain_type[family][i] != NULL && | |
134 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
135 | return i; | |
136 | } | |
137 | return -1; | |
138 | } | |
139 | ||
140 | static int nf_tables_chain_type_lookup(const struct nft_af_info *afi, | |
141 | const struct nlattr *nla, | |
142 | bool autoload) | |
143 | { | |
144 | int type; | |
145 | ||
146 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
147 | #ifdef CONFIG_MODULES | |
148 | if (type < 0 && autoload) { | |
149 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
150 | request_module("nft-chain-%u-%*.s", afi->family, | |
151 | nla_len(nla)-1, (const char *)nla_data(nla)); | |
152 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
153 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
154 | } | |
155 | #endif | |
156 | return type; | |
157 | } | |
158 | ||
96518518 PM |
159 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
160 | [NFTA_TABLE_NAME] = { .type = NLA_STRING }, | |
161 | }; | |
162 | ||
163 | static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq, | |
164 | int event, u32 flags, int family, | |
165 | const struct nft_table *table) | |
166 | { | |
167 | struct nlmsghdr *nlh; | |
168 | struct nfgenmsg *nfmsg; | |
169 | ||
170 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
171 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
172 | if (nlh == NULL) | |
173 | goto nla_put_failure; | |
174 | ||
175 | nfmsg = nlmsg_data(nlh); | |
176 | nfmsg->nfgen_family = family; | |
177 | nfmsg->version = NFNETLINK_V0; | |
178 | nfmsg->res_id = 0; | |
179 | ||
180 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name)) | |
181 | goto nla_put_failure; | |
182 | ||
183 | return nlmsg_end(skb, nlh); | |
184 | ||
185 | nla_put_failure: | |
186 | nlmsg_trim(skb, nlh); | |
187 | return -1; | |
188 | } | |
189 | ||
190 | static int nf_tables_table_notify(const struct sk_buff *oskb, | |
191 | const struct nlmsghdr *nlh, | |
192 | const struct nft_table *table, | |
193 | int event, int family) | |
194 | { | |
195 | struct sk_buff *skb; | |
196 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
197 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
198 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
199 | bool report; | |
200 | int err; | |
201 | ||
202 | report = nlh ? nlmsg_report(nlh) : false; | |
203 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
204 | return 0; | |
205 | ||
206 | err = -ENOBUFS; | |
207 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
208 | if (skb == NULL) | |
209 | goto err; | |
210 | ||
211 | err = nf_tables_fill_table_info(skb, portid, seq, event, 0, | |
212 | family, table); | |
213 | if (err < 0) { | |
214 | kfree_skb(skb); | |
215 | goto err; | |
216 | } | |
217 | ||
218 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
219 | GFP_KERNEL); | |
220 | err: | |
221 | if (err < 0) | |
222 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
223 | return err; | |
224 | } | |
225 | ||
226 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
227 | struct netlink_callback *cb) | |
228 | { | |
229 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
230 | const struct nft_af_info *afi; | |
231 | const struct nft_table *table; | |
232 | unsigned int idx = 0, s_idx = cb->args[0]; | |
233 | int family = nfmsg->nfgen_family; | |
234 | ||
235 | list_for_each_entry(afi, &nf_tables_afinfo, list) { | |
236 | if (family != NFPROTO_UNSPEC && family != afi->family) | |
237 | continue; | |
238 | ||
239 | list_for_each_entry(table, &afi->tables, list) { | |
240 | if (idx < s_idx) | |
241 | goto cont; | |
242 | if (idx > s_idx) | |
243 | memset(&cb->args[1], 0, | |
244 | sizeof(cb->args) - sizeof(cb->args[0])); | |
245 | if (nf_tables_fill_table_info(skb, | |
246 | NETLINK_CB(cb->skb).portid, | |
247 | cb->nlh->nlmsg_seq, | |
248 | NFT_MSG_NEWTABLE, | |
249 | NLM_F_MULTI, | |
250 | afi->family, table) < 0) | |
251 | goto done; | |
252 | cont: | |
253 | idx++; | |
254 | } | |
255 | } | |
256 | done: | |
257 | cb->args[0] = idx; | |
258 | return skb->len; | |
259 | } | |
260 | ||
261 | static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb, | |
262 | const struct nlmsghdr *nlh, | |
263 | const struct nlattr * const nla[]) | |
264 | { | |
265 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
266 | const struct nft_af_info *afi; | |
267 | const struct nft_table *table; | |
268 | struct sk_buff *skb2; | |
269 | int family = nfmsg->nfgen_family; | |
270 | int err; | |
271 | ||
272 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
273 | struct netlink_dump_control c = { | |
274 | .dump = nf_tables_dump_tables, | |
275 | }; | |
276 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
277 | } | |
278 | ||
279 | afi = nf_tables_afinfo_lookup(family, false); | |
280 | if (IS_ERR(afi)) | |
281 | return PTR_ERR(afi); | |
282 | ||
9370761c | 283 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
284 | if (IS_ERR(table)) |
285 | return PTR_ERR(table); | |
286 | ||
287 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
288 | if (!skb2) | |
289 | return -ENOMEM; | |
290 | ||
291 | err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid, | |
292 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, | |
293 | family, table); | |
294 | if (err < 0) | |
295 | goto err; | |
296 | ||
297 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
298 | ||
299 | err: | |
300 | kfree_skb(skb2); | |
301 | return err; | |
302 | } | |
303 | ||
304 | static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb, | |
305 | const struct nlmsghdr *nlh, | |
306 | const struct nlattr * const nla[]) | |
307 | { | |
308 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
309 | const struct nlattr *name; | |
310 | struct nft_af_info *afi; | |
311 | struct nft_table *table; | |
312 | int family = nfmsg->nfgen_family; | |
313 | ||
314 | afi = nf_tables_afinfo_lookup(family, true); | |
315 | if (IS_ERR(afi)) | |
316 | return PTR_ERR(afi); | |
317 | ||
318 | name = nla[NFTA_TABLE_NAME]; | |
9370761c | 319 | table = nf_tables_table_lookup(afi, name); |
96518518 PM |
320 | if (IS_ERR(table)) { |
321 | if (PTR_ERR(table) != -ENOENT) | |
322 | return PTR_ERR(table); | |
323 | table = NULL; | |
324 | } | |
325 | ||
326 | if (table != NULL) { | |
327 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
328 | return -EEXIST; | |
329 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
330 | return -EOPNOTSUPP; | |
331 | return 0; | |
332 | } | |
333 | ||
334 | table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL); | |
335 | if (table == NULL) | |
336 | return -ENOMEM; | |
337 | ||
338 | nla_strlcpy(table->name, name, nla_len(name)); | |
339 | INIT_LIST_HEAD(&table->chains); | |
20a69341 | 340 | INIT_LIST_HEAD(&table->sets); |
96518518 PM |
341 | |
342 | list_add_tail(&table->list, &afi->tables); | |
343 | nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family); | |
344 | return 0; | |
345 | } | |
346 | ||
347 | static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb, | |
348 | const struct nlmsghdr *nlh, | |
349 | const struct nlattr * const nla[]) | |
350 | { | |
351 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
352 | struct nft_af_info *afi; | |
353 | struct nft_table *table; | |
354 | int family = nfmsg->nfgen_family; | |
355 | ||
356 | afi = nf_tables_afinfo_lookup(family, false); | |
357 | if (IS_ERR(afi)) | |
358 | return PTR_ERR(afi); | |
359 | ||
9370761c | 360 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
361 | if (IS_ERR(table)) |
362 | return PTR_ERR(table); | |
363 | ||
96518518 PM |
364 | if (table->use) |
365 | return -EBUSY; | |
366 | ||
367 | list_del(&table->list); | |
368 | nf_tables_table_notify(skb, nlh, table, NFT_MSG_DELTABLE, family); | |
369 | kfree(table); | |
370 | return 0; | |
371 | } | |
372 | ||
9370761c | 373 | int nft_register_chain_type(struct nf_chain_type *ctype) |
96518518 | 374 | { |
9370761c | 375 | int err = 0; |
96518518 PM |
376 | |
377 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
9370761c PNA |
378 | if (chain_type[ctype->family][ctype->type] != NULL) { |
379 | err = -EBUSY; | |
380 | goto out; | |
96518518 PM |
381 | } |
382 | ||
9370761c PNA |
383 | if (!try_module_get(ctype->me)) |
384 | goto out; | |
96518518 | 385 | |
9370761c PNA |
386 | chain_type[ctype->family][ctype->type] = ctype; |
387 | out: | |
96518518 PM |
388 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
389 | return err; | |
390 | } | |
9370761c | 391 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 392 | |
9370761c | 393 | void nft_unregister_chain_type(struct nf_chain_type *ctype) |
96518518 | 394 | { |
96518518 | 395 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c PNA |
396 | chain_type[ctype->family][ctype->type] = NULL; |
397 | module_put(ctype->me); | |
96518518 PM |
398 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
399 | } | |
9370761c | 400 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
401 | |
402 | /* | |
403 | * Chains | |
404 | */ | |
405 | ||
406 | static struct nft_chain * | |
407 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) | |
408 | { | |
409 | struct nft_chain *chain; | |
410 | ||
411 | list_for_each_entry(chain, &table->chains, list) { | |
412 | if (chain->handle == handle) | |
413 | return chain; | |
414 | } | |
415 | ||
416 | return ERR_PTR(-ENOENT); | |
417 | } | |
418 | ||
419 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
420 | const struct nlattr *nla) | |
421 | { | |
422 | struct nft_chain *chain; | |
423 | ||
424 | if (nla == NULL) | |
425 | return ERR_PTR(-EINVAL); | |
426 | ||
427 | list_for_each_entry(chain, &table->chains, list) { | |
428 | if (!nla_strcmp(nla, chain->name)) | |
429 | return chain; | |
430 | } | |
431 | ||
432 | return ERR_PTR(-ENOENT); | |
433 | } | |
434 | ||
435 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
436 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, | |
437 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, | |
438 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
439 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
440 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 441 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
9370761c | 442 | [NFTA_CHAIN_TYPE] = { .type = NLA_NUL_STRING }, |
0ca743a5 | 443 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
444 | }; |
445 | ||
446 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
447 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
448 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
449 | }; | |
450 | ||
0ca743a5 PNA |
451 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
452 | { | |
453 | struct nft_stats *cpu_stats, total; | |
454 | struct nlattr *nest; | |
455 | int cpu; | |
456 | ||
457 | memset(&total, 0, sizeof(total)); | |
458 | for_each_possible_cpu(cpu) { | |
459 | cpu_stats = per_cpu_ptr(stats, cpu); | |
460 | total.pkts += cpu_stats->pkts; | |
461 | total.bytes += cpu_stats->bytes; | |
462 | } | |
463 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
464 | if (nest == NULL) | |
465 | goto nla_put_failure; | |
466 | ||
467 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) || | |
468 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes))) | |
469 | goto nla_put_failure; | |
470 | ||
471 | nla_nest_end(skb, nest); | |
472 | return 0; | |
473 | ||
474 | nla_put_failure: | |
475 | return -ENOSPC; | |
476 | } | |
477 | ||
96518518 PM |
478 | static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq, |
479 | int event, u32 flags, int family, | |
480 | const struct nft_table *table, | |
481 | const struct nft_chain *chain) | |
482 | { | |
483 | struct nlmsghdr *nlh; | |
484 | struct nfgenmsg *nfmsg; | |
485 | ||
486 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
487 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
488 | if (nlh == NULL) | |
489 | goto nla_put_failure; | |
490 | ||
491 | nfmsg = nlmsg_data(nlh); | |
492 | nfmsg->nfgen_family = family; | |
493 | nfmsg->version = NFNETLINK_V0; | |
494 | nfmsg->res_id = 0; | |
495 | ||
496 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
497 | goto nla_put_failure; | |
498 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle))) | |
499 | goto nla_put_failure; | |
500 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
501 | goto nla_put_failure; | |
502 | ||
503 | if (chain->flags & NFT_BASE_CHAIN) { | |
0ca743a5 PNA |
504 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
505 | const struct nf_hook_ops *ops = &basechain->ops; | |
506 | struct nlattr *nest; | |
507 | ||
508 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
509 | if (nest == NULL) |
510 | goto nla_put_failure; | |
511 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
512 | goto nla_put_failure; | |
513 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
514 | goto nla_put_failure; | |
515 | nla_nest_end(skb, nest); | |
9370761c | 516 | |
0ca743a5 PNA |
517 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
518 | htonl(basechain->policy))) | |
519 | goto nla_put_failure; | |
520 | ||
9370761c PNA |
521 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, |
522 | chain_type[ops->pf][nft_base_chain(chain)->type]->name)) | |
523 | goto nla_put_failure; | |
0ca743a5 PNA |
524 | |
525 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
526 | goto nla_put_failure; | |
96518518 PM |
527 | } |
528 | ||
0ca743a5 PNA |
529 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
530 | goto nla_put_failure; | |
531 | ||
96518518 PM |
532 | return nlmsg_end(skb, nlh); |
533 | ||
534 | nla_put_failure: | |
535 | nlmsg_trim(skb, nlh); | |
536 | return -1; | |
537 | } | |
538 | ||
539 | static int nf_tables_chain_notify(const struct sk_buff *oskb, | |
540 | const struct nlmsghdr *nlh, | |
541 | const struct nft_table *table, | |
542 | const struct nft_chain *chain, | |
543 | int event, int family) | |
544 | { | |
545 | struct sk_buff *skb; | |
546 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
547 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
548 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
549 | bool report; | |
550 | int err; | |
551 | ||
552 | report = nlh ? nlmsg_report(nlh) : false; | |
553 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
554 | return 0; | |
555 | ||
556 | err = -ENOBUFS; | |
557 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
558 | if (skb == NULL) | |
559 | goto err; | |
560 | ||
561 | err = nf_tables_fill_chain_info(skb, portid, seq, event, 0, family, | |
562 | table, chain); | |
563 | if (err < 0) { | |
564 | kfree_skb(skb); | |
565 | goto err; | |
566 | } | |
567 | ||
568 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
569 | GFP_KERNEL); | |
570 | err: | |
571 | if (err < 0) | |
572 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
573 | return err; | |
574 | } | |
575 | ||
576 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
577 | struct netlink_callback *cb) | |
578 | { | |
579 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
580 | const struct nft_af_info *afi; | |
581 | const struct nft_table *table; | |
582 | const struct nft_chain *chain; | |
583 | unsigned int idx = 0, s_idx = cb->args[0]; | |
584 | int family = nfmsg->nfgen_family; | |
585 | ||
586 | list_for_each_entry(afi, &nf_tables_afinfo, list) { | |
587 | if (family != NFPROTO_UNSPEC && family != afi->family) | |
588 | continue; | |
589 | ||
590 | list_for_each_entry(table, &afi->tables, list) { | |
591 | list_for_each_entry(chain, &table->chains, list) { | |
592 | if (idx < s_idx) | |
593 | goto cont; | |
594 | if (idx > s_idx) | |
595 | memset(&cb->args[1], 0, | |
596 | sizeof(cb->args) - sizeof(cb->args[0])); | |
597 | if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid, | |
598 | cb->nlh->nlmsg_seq, | |
599 | NFT_MSG_NEWCHAIN, | |
600 | NLM_F_MULTI, | |
601 | afi->family, table, chain) < 0) | |
602 | goto done; | |
603 | cont: | |
604 | idx++; | |
605 | } | |
606 | } | |
607 | } | |
608 | done: | |
609 | cb->args[0] = idx; | |
610 | return skb->len; | |
611 | } | |
612 | ||
613 | ||
614 | static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb, | |
615 | const struct nlmsghdr *nlh, | |
616 | const struct nlattr * const nla[]) | |
617 | { | |
618 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
619 | const struct nft_af_info *afi; | |
620 | const struct nft_table *table; | |
621 | const struct nft_chain *chain; | |
622 | struct sk_buff *skb2; | |
623 | int family = nfmsg->nfgen_family; | |
624 | int err; | |
625 | ||
626 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
627 | struct netlink_dump_control c = { | |
628 | .dump = nf_tables_dump_chains, | |
629 | }; | |
630 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
631 | } | |
632 | ||
633 | afi = nf_tables_afinfo_lookup(family, false); | |
634 | if (IS_ERR(afi)) | |
635 | return PTR_ERR(afi); | |
636 | ||
9370761c | 637 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
638 | if (IS_ERR(table)) |
639 | return PTR_ERR(table); | |
640 | ||
641 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
642 | if (IS_ERR(chain)) | |
643 | return PTR_ERR(chain); | |
644 | ||
645 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
646 | if (!skb2) | |
647 | return -ENOMEM; | |
648 | ||
649 | err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid, | |
650 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, | |
651 | family, table, chain); | |
652 | if (err < 0) | |
653 | goto err; | |
654 | ||
655 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
656 | ||
657 | err: | |
658 | kfree_skb(skb2); | |
659 | return err; | |
660 | } | |
661 | ||
0ca743a5 PNA |
662 | static int |
663 | nf_tables_chain_policy(struct nft_base_chain *chain, const struct nlattr *attr) | |
664 | { | |
665 | switch (ntohl(nla_get_be32(attr))) { | |
666 | case NF_DROP: | |
667 | chain->policy = NF_DROP; | |
668 | break; | |
669 | case NF_ACCEPT: | |
670 | chain->policy = NF_ACCEPT; | |
671 | break; | |
672 | default: | |
673 | return -EINVAL; | |
674 | } | |
675 | return 0; | |
676 | } | |
677 | ||
678 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { | |
679 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
680 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
681 | }; | |
682 | ||
683 | static int | |
684 | nf_tables_counters(struct nft_base_chain *chain, const struct nlattr *attr) | |
685 | { | |
686 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
687 | struct nft_stats __percpu *newstats; | |
688 | struct nft_stats *stats; | |
689 | int err; | |
690 | ||
691 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); | |
692 | if (err < 0) | |
693 | return err; | |
694 | ||
695 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
696 | return -EINVAL; | |
697 | ||
698 | newstats = alloc_percpu(struct nft_stats); | |
699 | if (newstats == NULL) | |
700 | return -ENOMEM; | |
701 | ||
702 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
703 | * are not exposed to userspace. | |
704 | */ | |
705 | stats = this_cpu_ptr(newstats); | |
706 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
707 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
708 | ||
709 | if (chain->stats) { | |
710 | /* nfnl_lock is held, add some nfnl function for this, later */ | |
711 | struct nft_stats __percpu *oldstats = | |
712 | rcu_dereference_protected(chain->stats, 1); | |
713 | ||
714 | rcu_assign_pointer(chain->stats, newstats); | |
715 | synchronize_rcu(); | |
716 | free_percpu(oldstats); | |
717 | } else | |
718 | rcu_assign_pointer(chain->stats, newstats); | |
719 | ||
720 | return 0; | |
721 | } | |
722 | ||
96518518 PM |
723 | static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb, |
724 | const struct nlmsghdr *nlh, | |
725 | const struct nlattr * const nla[]) | |
726 | { | |
727 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
728 | const struct nlattr * uninitialized_var(name); | |
729 | const struct nft_af_info *afi; | |
730 | struct nft_table *table; | |
731 | struct nft_chain *chain; | |
0ca743a5 | 732 | struct nft_base_chain *basechain = NULL; |
96518518 PM |
733 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
734 | int family = nfmsg->nfgen_family; | |
735 | u64 handle = 0; | |
736 | int err; | |
737 | bool create; | |
738 | ||
739 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
740 | ||
741 | afi = nf_tables_afinfo_lookup(family, true); | |
742 | if (IS_ERR(afi)) | |
743 | return PTR_ERR(afi); | |
744 | ||
9370761c | 745 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
746 | if (IS_ERR(table)) |
747 | return PTR_ERR(table); | |
748 | ||
749 | if (table->use == UINT_MAX) | |
750 | return -EOVERFLOW; | |
751 | ||
752 | chain = NULL; | |
753 | name = nla[NFTA_CHAIN_NAME]; | |
754 | ||
755 | if (nla[NFTA_CHAIN_HANDLE]) { | |
756 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
757 | chain = nf_tables_chain_lookup_byhandle(table, handle); | |
758 | if (IS_ERR(chain)) | |
759 | return PTR_ERR(chain); | |
760 | } else { | |
761 | chain = nf_tables_chain_lookup(table, name); | |
762 | if (IS_ERR(chain)) { | |
763 | if (PTR_ERR(chain) != -ENOENT) | |
764 | return PTR_ERR(chain); | |
765 | chain = NULL; | |
766 | } | |
767 | } | |
768 | ||
769 | if (chain != NULL) { | |
770 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
771 | return -EEXIST; | |
772 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
773 | return -EOPNOTSUPP; | |
774 | ||
775 | if (nla[NFTA_CHAIN_HANDLE] && name && | |
776 | !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) | |
777 | return -EEXIST; | |
778 | ||
0ca743a5 PNA |
779 | if (nla[NFTA_CHAIN_POLICY]) { |
780 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
781 | return -EOPNOTSUPP; | |
782 | ||
783 | err = nf_tables_chain_policy(nft_base_chain(chain), | |
784 | nla[NFTA_CHAIN_POLICY]); | |
785 | if (err < 0) | |
786 | return err; | |
787 | } | |
788 | ||
789 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
790 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
791 | return -EOPNOTSUPP; | |
792 | ||
793 | err = nf_tables_counters(nft_base_chain(chain), | |
794 | nla[NFTA_CHAIN_COUNTERS]); | |
795 | if (err < 0) | |
796 | return err; | |
797 | } | |
798 | ||
96518518 PM |
799 | if (nla[NFTA_CHAIN_HANDLE] && name) |
800 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); | |
801 | ||
802 | goto notify; | |
803 | } | |
804 | ||
805 | if (nla[NFTA_CHAIN_HOOK]) { | |
806 | struct nf_hook_ops *ops; | |
9370761c PNA |
807 | nf_hookfn *hookfn; |
808 | u32 hooknum; | |
809 | int type = NFT_CHAIN_T_DEFAULT; | |
810 | ||
811 | if (nla[NFTA_CHAIN_TYPE]) { | |
812 | type = nf_tables_chain_type_lookup(afi, | |
813 | nla[NFTA_CHAIN_TYPE], | |
814 | create); | |
815 | if (type < 0) | |
816 | return -ENOENT; | |
817 | } | |
96518518 PM |
818 | |
819 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
820 | nft_hook_policy); | |
821 | if (err < 0) | |
822 | return err; | |
823 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
824 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
825 | return -EINVAL; | |
9370761c PNA |
826 | |
827 | hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
828 | if (hooknum >= afi->nhooks) | |
96518518 PM |
829 | return -EINVAL; |
830 | ||
9370761c PNA |
831 | hookfn = chain_type[family][type]->fn[hooknum]; |
832 | if (hookfn == NULL) | |
833 | return -EOPNOTSUPP; | |
834 | ||
96518518 PM |
835 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
836 | if (basechain == NULL) | |
837 | return -ENOMEM; | |
9370761c PNA |
838 | |
839 | basechain->type = type; | |
96518518 PM |
840 | chain = &basechain->chain; |
841 | ||
842 | ops = &basechain->ops; | |
843 | ops->pf = family; | |
844 | ops->owner = afi->owner; | |
845 | ops->hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
846 | ops->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); | |
847 | ops->priv = chain; | |
9370761c | 848 | ops->hook = hookfn; |
96518518 PM |
849 | if (afi->hooks[ops->hooknum]) |
850 | ops->hook = afi->hooks[ops->hooknum]; | |
851 | ||
852 | chain->flags |= NFT_BASE_CHAIN; | |
0ca743a5 PNA |
853 | |
854 | if (nla[NFTA_CHAIN_POLICY]) { | |
855 | err = nf_tables_chain_policy(basechain, | |
856 | nla[NFTA_CHAIN_POLICY]); | |
857 | if (err < 0) { | |
858 | free_percpu(basechain->stats); | |
859 | kfree(basechain); | |
860 | return err; | |
861 | } | |
862 | } else | |
863 | basechain->policy = NF_ACCEPT; | |
864 | ||
865 | if (nla[NFTA_CHAIN_COUNTERS]) { | |
866 | err = nf_tables_counters(basechain, | |
867 | nla[NFTA_CHAIN_COUNTERS]); | |
868 | if (err < 0) { | |
869 | free_percpu(basechain->stats); | |
870 | kfree(basechain); | |
871 | return err; | |
872 | } | |
873 | } else { | |
874 | struct nft_stats __percpu *newstats; | |
875 | ||
876 | newstats = alloc_percpu(struct nft_stats); | |
877 | if (newstats == NULL) | |
878 | return -ENOMEM; | |
879 | ||
880 | rcu_assign_pointer(nft_base_chain(chain)->stats, | |
881 | newstats); | |
882 | } | |
96518518 PM |
883 | } else { |
884 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
885 | if (chain == NULL) | |
886 | return -ENOMEM; | |
887 | } | |
888 | ||
889 | INIT_LIST_HEAD(&chain->rules); | |
890 | chain->handle = nf_tables_alloc_handle(table); | |
891 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); | |
892 | ||
893 | list_add_tail(&chain->list, &table->chains); | |
894 | table->use++; | |
0ca743a5 PNA |
895 | |
896 | if (chain->flags & NFT_BASE_CHAIN) { | |
897 | err = nf_register_hook(&nft_base_chain(chain)->ops); | |
898 | if (err < 0) { | |
899 | free_percpu(basechain->stats); | |
900 | kfree(basechain); | |
901 | return err; | |
902 | } | |
903 | } | |
96518518 PM |
904 | notify: |
905 | nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_NEWCHAIN, | |
906 | family); | |
907 | return 0; | |
908 | } | |
909 | ||
910 | static void nf_tables_rcu_chain_destroy(struct rcu_head *head) | |
911 | { | |
912 | struct nft_chain *chain = container_of(head, struct nft_chain, rcu_head); | |
913 | ||
914 | BUG_ON(chain->use > 0); | |
915 | ||
0ca743a5 PNA |
916 | if (chain->flags & NFT_BASE_CHAIN) { |
917 | free_percpu(nft_base_chain(chain)->stats); | |
96518518 | 918 | kfree(nft_base_chain(chain)); |
0ca743a5 | 919 | } else |
96518518 PM |
920 | kfree(chain); |
921 | } | |
922 | ||
923 | static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb, | |
924 | const struct nlmsghdr *nlh, | |
925 | const struct nlattr * const nla[]) | |
926 | { | |
927 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
928 | const struct nft_af_info *afi; | |
929 | struct nft_table *table; | |
930 | struct nft_chain *chain; | |
931 | int family = nfmsg->nfgen_family; | |
932 | ||
933 | afi = nf_tables_afinfo_lookup(family, false); | |
934 | if (IS_ERR(afi)) | |
935 | return PTR_ERR(afi); | |
936 | ||
9370761c | 937 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
938 | if (IS_ERR(table)) |
939 | return PTR_ERR(table); | |
940 | ||
941 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
942 | if (IS_ERR(chain)) | |
943 | return PTR_ERR(chain); | |
944 | ||
96518518 PM |
945 | if (!list_empty(&chain->rules)) |
946 | return -EBUSY; | |
947 | ||
948 | list_del(&chain->list); | |
949 | table->use--; | |
950 | ||
951 | if (chain->flags & NFT_BASE_CHAIN) | |
952 | nf_unregister_hook(&nft_base_chain(chain)->ops); | |
953 | ||
954 | nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN, | |
955 | family); | |
956 | ||
957 | /* Make sure all rule references are gone before this is released */ | |
958 | call_rcu(&chain->rcu_head, nf_tables_rcu_chain_destroy); | |
959 | return 0; | |
960 | } | |
961 | ||
962 | static void nft_ctx_init(struct nft_ctx *ctx, | |
20a69341 PM |
963 | const struct sk_buff *skb, |
964 | const struct nlmsghdr *nlh, | |
96518518 PM |
965 | const struct nft_af_info *afi, |
966 | const struct nft_table *table, | |
0ca743a5 PNA |
967 | const struct nft_chain *chain, |
968 | const struct nlattr * const *nla) | |
96518518 | 969 | { |
20a69341 PM |
970 | ctx->skb = skb; |
971 | ctx->nlh = nlh; | |
96518518 PM |
972 | ctx->afi = afi; |
973 | ctx->table = table; | |
974 | ctx->chain = chain; | |
0ca743a5 | 975 | ctx->nla = nla; |
96518518 PM |
976 | } |
977 | ||
978 | /* | |
979 | * Expressions | |
980 | */ | |
981 | ||
982 | /** | |
ef1f7df9 PM |
983 | * nft_register_expr - register nf_tables expr type |
984 | * @ops: expr type | |
96518518 | 985 | * |
ef1f7df9 | 986 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
987 | * success or a negative errno code otherwise. |
988 | */ | |
ef1f7df9 | 989 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
990 | { |
991 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
ef1f7df9 | 992 | list_add_tail(&type->list, &nf_tables_expressions); |
96518518 PM |
993 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
994 | return 0; | |
995 | } | |
996 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
997 | ||
998 | /** | |
ef1f7df9 PM |
999 | * nft_unregister_expr - unregister nf_tables expr type |
1000 | * @ops: expr type | |
96518518 | 1001 | * |
ef1f7df9 | 1002 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1003 | */ |
ef1f7df9 | 1004 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1005 | { |
1006 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
ef1f7df9 | 1007 | list_del(&type->list); |
96518518 PM |
1008 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1009 | } | |
1010 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1011 | ||
ef1f7df9 | 1012 | static const struct nft_expr_type *__nft_expr_type_get(struct nlattr *nla) |
96518518 | 1013 | { |
ef1f7df9 | 1014 | const struct nft_expr_type *type; |
96518518 | 1015 | |
ef1f7df9 PM |
1016 | list_for_each_entry(type, &nf_tables_expressions, list) { |
1017 | if (!nla_strcmp(nla, type->name)) | |
1018 | return type; | |
96518518 PM |
1019 | } |
1020 | return NULL; | |
1021 | } | |
1022 | ||
ef1f7df9 | 1023 | static const struct nft_expr_type *nft_expr_type_get(struct nlattr *nla) |
96518518 | 1024 | { |
ef1f7df9 | 1025 | const struct nft_expr_type *type; |
96518518 PM |
1026 | |
1027 | if (nla == NULL) | |
1028 | return ERR_PTR(-EINVAL); | |
1029 | ||
ef1f7df9 PM |
1030 | type = __nft_expr_type_get(nla); |
1031 | if (type != NULL && try_module_get(type->owner)) | |
1032 | return type; | |
96518518 PM |
1033 | |
1034 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1035 | if (type == NULL) { |
96518518 PM |
1036 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1037 | request_module("nft-expr-%.*s", | |
1038 | nla_len(nla), (char *)nla_data(nla)); | |
1039 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
ef1f7df9 | 1040 | if (__nft_expr_type_get(nla)) |
96518518 PM |
1041 | return ERR_PTR(-EAGAIN); |
1042 | } | |
1043 | #endif | |
1044 | return ERR_PTR(-ENOENT); | |
1045 | } | |
1046 | ||
1047 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1048 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1049 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1050 | }; | |
1051 | ||
1052 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1053 | const struct nft_expr *expr) | |
1054 | { | |
ef1f7df9 | 1055 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1056 | goto nla_put_failure; |
1057 | ||
1058 | if (expr->ops->dump) { | |
1059 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1060 | if (data == NULL) | |
1061 | goto nla_put_failure; | |
1062 | if (expr->ops->dump(skb, expr) < 0) | |
1063 | goto nla_put_failure; | |
1064 | nla_nest_end(skb, data); | |
1065 | } | |
1066 | ||
1067 | return skb->len; | |
1068 | ||
1069 | nla_put_failure: | |
1070 | return -1; | |
1071 | }; | |
1072 | ||
1073 | struct nft_expr_info { | |
1074 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1075 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1076 | }; |
1077 | ||
0ca743a5 PNA |
1078 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1079 | const struct nlattr *nla, | |
96518518 PM |
1080 | struct nft_expr_info *info) |
1081 | { | |
ef1f7df9 | 1082 | const struct nft_expr_type *type; |
96518518 | 1083 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1084 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1085 | int err; |
1086 | ||
ef1f7df9 | 1087 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
96518518 PM |
1088 | if (err < 0) |
1089 | return err; | |
1090 | ||
ef1f7df9 PM |
1091 | type = nft_expr_type_get(tb[NFTA_EXPR_NAME]); |
1092 | if (IS_ERR(type)) | |
1093 | return PTR_ERR(type); | |
1094 | ||
1095 | if (tb[NFTA_EXPR_DATA]) { | |
1096 | err = nla_parse_nested(info->tb, type->maxattr, | |
1097 | tb[NFTA_EXPR_DATA], type->policy); | |
1098 | if (err < 0) | |
1099 | goto err1; | |
1100 | } else | |
1101 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1102 | ||
1103 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1104 | ops = type->select_ops(ctx, |
1105 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1106 | if (IS_ERR(ops)) { |
1107 | err = PTR_ERR(ops); | |
1108 | goto err1; | |
1109 | } | |
1110 | } else | |
1111 | ops = type->ops; | |
1112 | ||
96518518 PM |
1113 | info->ops = ops; |
1114 | return 0; | |
ef1f7df9 PM |
1115 | |
1116 | err1: | |
1117 | module_put(type->owner); | |
1118 | return err; | |
96518518 PM |
1119 | } |
1120 | ||
1121 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1122 | const struct nft_expr_info *info, |
96518518 PM |
1123 | struct nft_expr *expr) |
1124 | { | |
1125 | const struct nft_expr_ops *ops = info->ops; | |
1126 | int err; | |
1127 | ||
1128 | expr->ops = ops; | |
1129 | if (ops->init) { | |
ef1f7df9 | 1130 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1131 | if (err < 0) |
1132 | goto err1; | |
1133 | } | |
1134 | ||
96518518 PM |
1135 | return 0; |
1136 | ||
1137 | err1: | |
1138 | expr->ops = NULL; | |
1139 | return err; | |
1140 | } | |
1141 | ||
1142 | static void nf_tables_expr_destroy(struct nft_expr *expr) | |
1143 | { | |
1144 | if (expr->ops->destroy) | |
1145 | expr->ops->destroy(expr); | |
ef1f7df9 | 1146 | module_put(expr->ops->type->owner); |
96518518 PM |
1147 | } |
1148 | ||
1149 | /* | |
1150 | * Rules | |
1151 | */ | |
1152 | ||
1153 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1154 | u64 handle) | |
1155 | { | |
1156 | struct nft_rule *rule; | |
1157 | ||
1158 | // FIXME: this sucks | |
1159 | list_for_each_entry(rule, &chain->rules, list) { | |
1160 | if (handle == rule->handle) | |
1161 | return rule; | |
1162 | } | |
1163 | ||
1164 | return ERR_PTR(-ENOENT); | |
1165 | } | |
1166 | ||
1167 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1168 | const struct nlattr *nla) | |
1169 | { | |
1170 | if (nla == NULL) | |
1171 | return ERR_PTR(-EINVAL); | |
1172 | ||
1173 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1174 | } | |
1175 | ||
1176 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
1177 | [NFTA_RULE_TABLE] = { .type = NLA_STRING }, | |
1178 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, | |
1179 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1180 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1181 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1182 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
96518518 PM |
1183 | }; |
1184 | ||
1185 | static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq, | |
1186 | int event, u32 flags, int family, | |
1187 | const struct nft_table *table, | |
1188 | const struct nft_chain *chain, | |
1189 | const struct nft_rule *rule) | |
1190 | { | |
1191 | struct nlmsghdr *nlh; | |
1192 | struct nfgenmsg *nfmsg; | |
1193 | const struct nft_expr *expr, *next; | |
1194 | struct nlattr *list; | |
1195 | ||
1196 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
1197 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
1198 | flags); | |
1199 | if (nlh == NULL) | |
1200 | goto nla_put_failure; | |
1201 | ||
1202 | nfmsg = nlmsg_data(nlh); | |
1203 | nfmsg->nfgen_family = family; | |
1204 | nfmsg->version = NFNETLINK_V0; | |
1205 | nfmsg->res_id = 0; | |
1206 | ||
1207 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1208 | goto nla_put_failure; | |
1209 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1210 | goto nla_put_failure; | |
1211 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle))) | |
1212 | goto nla_put_failure; | |
1213 | ||
1214 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); | |
1215 | if (list == NULL) | |
1216 | goto nla_put_failure; | |
1217 | nft_rule_for_each_expr(expr, next, rule) { | |
1218 | struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM); | |
1219 | if (elem == NULL) | |
1220 | goto nla_put_failure; | |
1221 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1222 | goto nla_put_failure; | |
1223 | nla_nest_end(skb, elem); | |
1224 | } | |
1225 | nla_nest_end(skb, list); | |
1226 | ||
1227 | return nlmsg_end(skb, nlh); | |
1228 | ||
1229 | nla_put_failure: | |
1230 | nlmsg_trim(skb, nlh); | |
1231 | return -1; | |
1232 | } | |
1233 | ||
1234 | static int nf_tables_rule_notify(const struct sk_buff *oskb, | |
1235 | const struct nlmsghdr *nlh, | |
1236 | const struct nft_table *table, | |
1237 | const struct nft_chain *chain, | |
1238 | const struct nft_rule *rule, | |
1239 | int event, u32 flags, int family) | |
1240 | { | |
1241 | struct sk_buff *skb; | |
1242 | u32 portid = NETLINK_CB(oskb).portid; | |
1243 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
1244 | u32 seq = nlh->nlmsg_seq; | |
1245 | bool report; | |
1246 | int err; | |
1247 | ||
1248 | report = nlmsg_report(nlh); | |
1249 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
1250 | return 0; | |
1251 | ||
1252 | err = -ENOBUFS; | |
1253 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1254 | if (skb == NULL) | |
1255 | goto err; | |
1256 | ||
1257 | err = nf_tables_fill_rule_info(skb, portid, seq, event, flags, | |
1258 | family, table, chain, rule); | |
1259 | if (err < 0) { | |
1260 | kfree_skb(skb); | |
1261 | goto err; | |
1262 | } | |
1263 | ||
1264 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
1265 | GFP_KERNEL); | |
1266 | err: | |
1267 | if (err < 0) | |
1268 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
1269 | return err; | |
1270 | } | |
1271 | ||
1272 | static int nf_tables_dump_rules(struct sk_buff *skb, | |
1273 | struct netlink_callback *cb) | |
1274 | { | |
1275 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1276 | const struct nft_af_info *afi; | |
1277 | const struct nft_table *table; | |
1278 | const struct nft_chain *chain; | |
1279 | const struct nft_rule *rule; | |
1280 | unsigned int idx = 0, s_idx = cb->args[0]; | |
1281 | int family = nfmsg->nfgen_family; | |
1282 | ||
1283 | list_for_each_entry(afi, &nf_tables_afinfo, list) { | |
1284 | if (family != NFPROTO_UNSPEC && family != afi->family) | |
1285 | continue; | |
1286 | ||
1287 | list_for_each_entry(table, &afi->tables, list) { | |
1288 | list_for_each_entry(chain, &table->chains, list) { | |
1289 | list_for_each_entry(rule, &chain->rules, list) { | |
1290 | if (idx < s_idx) | |
1291 | goto cont; | |
1292 | if (idx > s_idx) | |
1293 | memset(&cb->args[1], 0, | |
1294 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1295 | if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid, | |
1296 | cb->nlh->nlmsg_seq, | |
1297 | NFT_MSG_NEWRULE, | |
1298 | NLM_F_MULTI | NLM_F_APPEND, | |
1299 | afi->family, table, chain, rule) < 0) | |
1300 | goto done; | |
1301 | cont: | |
1302 | idx++; | |
1303 | } | |
1304 | } | |
1305 | } | |
1306 | } | |
1307 | done: | |
1308 | cb->args[0] = idx; | |
1309 | return skb->len; | |
1310 | } | |
1311 | ||
1312 | static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb, | |
1313 | const struct nlmsghdr *nlh, | |
1314 | const struct nlattr * const nla[]) | |
1315 | { | |
1316 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1317 | const struct nft_af_info *afi; | |
1318 | const struct nft_table *table; | |
1319 | const struct nft_chain *chain; | |
1320 | const struct nft_rule *rule; | |
1321 | struct sk_buff *skb2; | |
1322 | int family = nfmsg->nfgen_family; | |
1323 | int err; | |
1324 | ||
1325 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1326 | struct netlink_dump_control c = { | |
1327 | .dump = nf_tables_dump_rules, | |
1328 | }; | |
1329 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1330 | } | |
1331 | ||
1332 | afi = nf_tables_afinfo_lookup(family, false); | |
1333 | if (IS_ERR(afi)) | |
1334 | return PTR_ERR(afi); | |
1335 | ||
9370761c | 1336 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1337 | if (IS_ERR(table)) |
1338 | return PTR_ERR(table); | |
1339 | ||
1340 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1341 | if (IS_ERR(chain)) | |
1342 | return PTR_ERR(chain); | |
1343 | ||
1344 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
1345 | if (IS_ERR(rule)) | |
1346 | return PTR_ERR(rule); | |
1347 | ||
1348 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1349 | if (!skb2) | |
1350 | return -ENOMEM; | |
1351 | ||
1352 | err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid, | |
1353 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, | |
1354 | family, table, chain, rule); | |
1355 | if (err < 0) | |
1356 | goto err; | |
1357 | ||
1358 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1359 | ||
1360 | err: | |
1361 | kfree_skb(skb2); | |
1362 | return err; | |
1363 | } | |
1364 | ||
1365 | static void nf_tables_rcu_rule_destroy(struct rcu_head *head) | |
1366 | { | |
1367 | struct nft_rule *rule = container_of(head, struct nft_rule, rcu_head); | |
1368 | struct nft_expr *expr; | |
1369 | ||
1370 | /* | |
1371 | * Careful: some expressions might not be initialized in case this | |
1372 | * is called on error from nf_tables_newrule(). | |
1373 | */ | |
1374 | expr = nft_expr_first(rule); | |
1375 | while (expr->ops && expr != nft_expr_last(rule)) { | |
1376 | nf_tables_expr_destroy(expr); | |
1377 | expr = nft_expr_next(expr); | |
1378 | } | |
1379 | kfree(rule); | |
1380 | } | |
1381 | ||
1382 | static void nf_tables_rule_destroy(struct nft_rule *rule) | |
1383 | { | |
1384 | call_rcu(&rule->rcu_head, nf_tables_rcu_rule_destroy); | |
1385 | } | |
1386 | ||
1387 | #define NFT_RULE_MAXEXPRS 128 | |
1388 | ||
1389 | static struct nft_expr_info *info; | |
1390 | ||
1391 | static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, | |
1392 | const struct nlmsghdr *nlh, | |
1393 | const struct nlattr * const nla[]) | |
1394 | { | |
1395 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1396 | const struct nft_af_info *afi; | |
1397 | struct nft_table *table; | |
1398 | struct nft_chain *chain; | |
1399 | struct nft_rule *rule, *old_rule = NULL; | |
1400 | struct nft_expr *expr; | |
1401 | struct nft_ctx ctx; | |
1402 | struct nlattr *tmp; | |
1403 | unsigned int size, i, n; | |
1404 | int err, rem; | |
1405 | bool create; | |
1406 | u64 handle; | |
1407 | ||
1408 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1409 | ||
1410 | afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, create); | |
1411 | if (IS_ERR(afi)) | |
1412 | return PTR_ERR(afi); | |
1413 | ||
9370761c | 1414 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1415 | if (IS_ERR(table)) |
1416 | return PTR_ERR(table); | |
1417 | ||
1418 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1419 | if (IS_ERR(chain)) | |
1420 | return PTR_ERR(chain); | |
1421 | ||
1422 | if (nla[NFTA_RULE_HANDLE]) { | |
1423 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
1424 | rule = __nf_tables_rule_lookup(chain, handle); | |
1425 | if (IS_ERR(rule)) | |
1426 | return PTR_ERR(rule); | |
1427 | ||
1428 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1429 | return -EEXIST; | |
1430 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1431 | old_rule = rule; | |
1432 | else | |
1433 | return -EOPNOTSUPP; | |
1434 | } else { | |
1435 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
1436 | return -EINVAL; | |
1437 | handle = nf_tables_alloc_handle(table); | |
1438 | } | |
1439 | ||
0ca743a5 PNA |
1440 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1441 | ||
96518518 PM |
1442 | n = 0; |
1443 | size = 0; | |
1444 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
1445 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
1446 | err = -EINVAL; | |
1447 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
1448 | goto err1; | |
1449 | if (n == NFT_RULE_MAXEXPRS) | |
1450 | goto err1; | |
0ca743a5 | 1451 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
1452 | if (err < 0) |
1453 | goto err1; | |
1454 | size += info[n].ops->size; | |
1455 | n++; | |
1456 | } | |
1457 | } | |
1458 | ||
1459 | err = -ENOMEM; | |
1460 | rule = kzalloc(sizeof(*rule) + size, GFP_KERNEL); | |
1461 | if (rule == NULL) | |
1462 | goto err1; | |
1463 | ||
1464 | rule->handle = handle; | |
1465 | rule->dlen = size; | |
1466 | ||
96518518 PM |
1467 | expr = nft_expr_first(rule); |
1468 | for (i = 0; i < n; i++) { | |
1469 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
1470 | if (err < 0) | |
1471 | goto err2; | |
ef1f7df9 | 1472 | info[i].ops = NULL; |
96518518 PM |
1473 | expr = nft_expr_next(expr); |
1474 | } | |
1475 | ||
96518518 PM |
1476 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
1477 | list_replace_rcu(&old_rule->list, &rule->list); | |
1478 | nf_tables_rule_destroy(old_rule); | |
1479 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) | |
1480 | list_add_tail_rcu(&rule->list, &chain->rules); | |
1481 | else | |
1482 | list_add_rcu(&rule->list, &chain->rules); | |
1483 | ||
1484 | nf_tables_rule_notify(skb, nlh, table, chain, rule, NFT_MSG_NEWRULE, | |
1485 | nlh->nlmsg_flags & (NLM_F_APPEND | NLM_F_REPLACE), | |
1486 | nfmsg->nfgen_family); | |
1487 | return 0; | |
1488 | ||
1489 | err2: | |
1490 | nf_tables_rule_destroy(rule); | |
1491 | err1: | |
1492 | for (i = 0; i < n; i++) { | |
1493 | if (info[i].ops != NULL) | |
ef1f7df9 | 1494 | module_put(info[i].ops->type->owner); |
96518518 PM |
1495 | } |
1496 | return err; | |
1497 | } | |
1498 | ||
1499 | static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb, | |
1500 | const struct nlmsghdr *nlh, | |
1501 | const struct nlattr * const nla[]) | |
1502 | { | |
1503 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1504 | const struct nft_af_info *afi; | |
1505 | const struct nft_table *table; | |
1506 | struct nft_chain *chain; | |
1507 | struct nft_rule *rule, *tmp; | |
1508 | int family = nfmsg->nfgen_family; | |
1509 | ||
1510 | afi = nf_tables_afinfo_lookup(family, false); | |
1511 | if (IS_ERR(afi)) | |
1512 | return PTR_ERR(afi); | |
1513 | ||
9370761c | 1514 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1515 | if (IS_ERR(table)) |
1516 | return PTR_ERR(table); | |
1517 | ||
1518 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1519 | if (IS_ERR(chain)) | |
1520 | return PTR_ERR(chain); | |
1521 | ||
1522 | if (nla[NFTA_RULE_HANDLE]) { | |
1523 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
1524 | if (IS_ERR(rule)) | |
1525 | return PTR_ERR(rule); | |
1526 | ||
1527 | /* List removal must be visible before destroying expressions */ | |
1528 | list_del_rcu(&rule->list); | |
1529 | ||
1530 | nf_tables_rule_notify(skb, nlh, table, chain, rule, | |
1531 | NFT_MSG_DELRULE, 0, family); | |
1532 | nf_tables_rule_destroy(rule); | |
1533 | } else { | |
1534 | /* Remove all rules in this chain */ | |
1535 | list_for_each_entry_safe(rule, tmp, &chain->rules, list) { | |
1536 | list_del_rcu(&rule->list); | |
1537 | ||
1538 | nf_tables_rule_notify(skb, nlh, table, chain, rule, | |
1539 | NFT_MSG_DELRULE, 0, family); | |
1540 | nf_tables_rule_destroy(rule); | |
1541 | } | |
1542 | } | |
1543 | ||
96518518 PM |
1544 | return 0; |
1545 | } | |
1546 | ||
20a69341 PM |
1547 | /* |
1548 | * Sets | |
1549 | */ | |
1550 | ||
1551 | static LIST_HEAD(nf_tables_set_ops); | |
1552 | ||
1553 | int nft_register_set(struct nft_set_ops *ops) | |
1554 | { | |
1555 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1556 | list_add_tail(&ops->list, &nf_tables_set_ops); | |
1557 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1558 | return 0; | |
1559 | } | |
1560 | EXPORT_SYMBOL_GPL(nft_register_set); | |
1561 | ||
1562 | void nft_unregister_set(struct nft_set_ops *ops) | |
1563 | { | |
1564 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1565 | list_del(&ops->list); | |
1566 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1567 | } | |
1568 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
1569 | ||
1570 | static const struct nft_set_ops *nft_select_set_ops(const struct nlattr * const nla[]) | |
1571 | { | |
1572 | const struct nft_set_ops *ops; | |
1573 | u32 features; | |
1574 | ||
1575 | #ifdef CONFIG_MODULES | |
1576 | if (list_empty(&nf_tables_set_ops)) { | |
1577 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1578 | request_module("nft-set"); | |
1579 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1580 | if (!list_empty(&nf_tables_set_ops)) | |
1581 | return ERR_PTR(-EAGAIN); | |
1582 | } | |
1583 | #endif | |
1584 | features = 0; | |
1585 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
1586 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
1587 | features &= NFT_SET_INTERVAL | NFT_SET_MAP; | |
1588 | } | |
1589 | ||
1590 | // FIXME: implement selection properly | |
1591 | list_for_each_entry(ops, &nf_tables_set_ops, list) { | |
1592 | if ((ops->features & features) != features) | |
1593 | continue; | |
1594 | if (!try_module_get(ops->owner)) | |
1595 | continue; | |
1596 | return ops; | |
1597 | } | |
1598 | ||
1599 | return ERR_PTR(-EOPNOTSUPP); | |
1600 | } | |
1601 | ||
1602 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
1603 | [NFTA_SET_TABLE] = { .type = NLA_STRING }, | |
1604 | [NFTA_SET_NAME] = { .type = NLA_STRING }, | |
1605 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, | |
1606 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
1607 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
1608 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
1609 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
1610 | }; | |
1611 | ||
1612 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, | |
1613 | const struct sk_buff *skb, | |
1614 | const struct nlmsghdr *nlh, | |
1615 | const struct nlattr * const nla[]) | |
1616 | { | |
1617 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1618 | const struct nft_af_info *afi; | |
1619 | const struct nft_table *table = NULL; | |
1620 | ||
1621 | afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, false); | |
1622 | if (IS_ERR(afi)) | |
1623 | return PTR_ERR(afi); | |
1624 | ||
1625 | if (nla[NFTA_SET_TABLE] != NULL) { | |
9370761c | 1626 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
1627 | if (IS_ERR(table)) |
1628 | return PTR_ERR(table); | |
1629 | } | |
1630 | ||
0ca743a5 | 1631 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
1632 | return 0; |
1633 | } | |
1634 | ||
1635 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, | |
1636 | const struct nlattr *nla) | |
1637 | { | |
1638 | struct nft_set *set; | |
1639 | ||
1640 | if (nla == NULL) | |
1641 | return ERR_PTR(-EINVAL); | |
1642 | ||
1643 | list_for_each_entry(set, &table->sets, list) { | |
1644 | if (!nla_strcmp(nla, set->name)) | |
1645 | return set; | |
1646 | } | |
1647 | return ERR_PTR(-ENOENT); | |
1648 | } | |
1649 | ||
1650 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, | |
1651 | const char *name) | |
1652 | { | |
1653 | const struct nft_set *i; | |
1654 | const char *p; | |
1655 | unsigned long *inuse; | |
1656 | unsigned int n = 0; | |
1657 | ||
1658 | p = strnchr(name, IFNAMSIZ, '%'); | |
1659 | if (p != NULL) { | |
1660 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
1661 | return -EINVAL; | |
1662 | ||
1663 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
1664 | if (inuse == NULL) | |
1665 | return -ENOMEM; | |
1666 | ||
1667 | list_for_each_entry(i, &ctx->table->sets, list) { | |
1668 | if (!sscanf(i->name, name, &n)) | |
1669 | continue; | |
1670 | if (n < 0 || n > BITS_PER_LONG * PAGE_SIZE) | |
1671 | continue; | |
1672 | set_bit(n, inuse); | |
1673 | } | |
1674 | ||
1675 | n = find_first_zero_bit(inuse, BITS_PER_LONG * PAGE_SIZE); | |
1676 | free_page((unsigned long)inuse); | |
1677 | } | |
1678 | ||
1679 | snprintf(set->name, sizeof(set->name), name, n); | |
1680 | list_for_each_entry(i, &ctx->table->sets, list) { | |
1681 | if (!strcmp(set->name, i->name)) | |
1682 | return -ENFILE; | |
1683 | } | |
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
1688 | const struct nft_set *set, u16 event, u16 flags) | |
1689 | { | |
1690 | struct nfgenmsg *nfmsg; | |
1691 | struct nlmsghdr *nlh; | |
1692 | u32 portid = NETLINK_CB(ctx->skb).portid; | |
1693 | u32 seq = ctx->nlh->nlmsg_seq; | |
1694 | ||
1695 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
1696 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
1697 | flags); | |
1698 | if (nlh == NULL) | |
1699 | goto nla_put_failure; | |
1700 | ||
1701 | nfmsg = nlmsg_data(nlh); | |
1702 | nfmsg->nfgen_family = ctx->afi->family; | |
1703 | nfmsg->version = NFNETLINK_V0; | |
1704 | nfmsg->res_id = 0; | |
1705 | ||
1706 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
1707 | goto nla_put_failure; | |
1708 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
1709 | goto nla_put_failure; | |
1710 | if (set->flags != 0) | |
1711 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
1712 | goto nla_put_failure; | |
1713 | ||
1714 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
1715 | goto nla_put_failure; | |
1716 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
1717 | goto nla_put_failure; | |
1718 | if (set->flags & NFT_SET_MAP) { | |
1719 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
1720 | goto nla_put_failure; | |
1721 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
1722 | goto nla_put_failure; | |
1723 | } | |
1724 | ||
1725 | return nlmsg_end(skb, nlh); | |
1726 | ||
1727 | nla_put_failure: | |
1728 | nlmsg_trim(skb, nlh); | |
1729 | return -1; | |
1730 | } | |
1731 | ||
1732 | static int nf_tables_set_notify(const struct nft_ctx *ctx, | |
1733 | const struct nft_set *set, | |
1734 | int event) | |
1735 | { | |
1736 | struct sk_buff *skb; | |
1737 | u32 portid = NETLINK_CB(ctx->skb).portid; | |
1738 | struct net *net = sock_net(ctx->skb->sk); | |
1739 | bool report; | |
1740 | int err; | |
1741 | ||
1742 | report = nlmsg_report(ctx->nlh); | |
1743 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
1744 | return 0; | |
1745 | ||
1746 | err = -ENOBUFS; | |
1747 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1748 | if (skb == NULL) | |
1749 | goto err; | |
1750 | ||
1751 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
1752 | if (err < 0) { | |
1753 | kfree_skb(skb); | |
1754 | goto err; | |
1755 | } | |
1756 | ||
1757 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
1758 | GFP_KERNEL); | |
1759 | err: | |
1760 | if (err < 0) | |
1761 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
1762 | return err; | |
1763 | } | |
1764 | ||
1765 | static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb, | |
1766 | struct netlink_callback *cb) | |
1767 | { | |
1768 | const struct nft_set *set; | |
1769 | unsigned int idx = 0, s_idx = cb->args[0]; | |
1770 | ||
1771 | if (cb->args[1]) | |
1772 | return skb->len; | |
1773 | ||
1774 | list_for_each_entry(set, &ctx->table->sets, list) { | |
1775 | if (idx < s_idx) | |
1776 | goto cont; | |
1777 | if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, | |
1778 | NLM_F_MULTI) < 0) { | |
1779 | cb->args[0] = idx; | |
1780 | goto done; | |
1781 | } | |
1782 | cont: | |
1783 | idx++; | |
1784 | } | |
1785 | cb->args[1] = 1; | |
1786 | done: | |
1787 | return skb->len; | |
1788 | } | |
1789 | ||
1790 | static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb, | |
1791 | struct netlink_callback *cb) | |
1792 | { | |
1793 | const struct nft_set *set; | |
1794 | unsigned int idx = 0, s_idx = cb->args[0]; | |
1795 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; | |
1796 | ||
1797 | if (cb->args[1]) | |
1798 | return skb->len; | |
1799 | ||
1800 | list_for_each_entry(table, &ctx->afi->tables, list) { | |
1801 | if (cur_table && cur_table != table) | |
1802 | continue; | |
1803 | ||
1804 | ctx->table = table; | |
1805 | list_for_each_entry(set, &ctx->table->sets, list) { | |
1806 | if (idx < s_idx) | |
1807 | goto cont; | |
1808 | if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, | |
1809 | NLM_F_MULTI) < 0) { | |
1810 | cb->args[0] = idx; | |
1811 | cb->args[2] = (unsigned long) table; | |
1812 | goto done; | |
1813 | } | |
1814 | cont: | |
1815 | idx++; | |
1816 | } | |
1817 | } | |
1818 | cb->args[1] = 1; | |
1819 | done: | |
1820 | return skb->len; | |
1821 | } | |
1822 | ||
1823 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) | |
1824 | { | |
1825 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1826 | struct nlattr *nla[NFTA_SET_MAX + 1]; | |
1827 | struct nft_ctx ctx; | |
1828 | int err, ret; | |
1829 | ||
1830 | err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX, | |
1831 | nft_set_policy); | |
1832 | if (err < 0) | |
1833 | return err; | |
1834 | ||
1835 | err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla); | |
1836 | if (err < 0) | |
1837 | return err; | |
1838 | ||
1839 | if (ctx.table == NULL) | |
1840 | ret = nf_tables_dump_sets_all(&ctx, skb, cb); | |
1841 | else | |
1842 | ret = nf_tables_dump_sets_table(&ctx, skb, cb); | |
1843 | ||
1844 | return ret; | |
1845 | } | |
1846 | ||
1847 | static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb, | |
1848 | const struct nlmsghdr *nlh, | |
1849 | const struct nlattr * const nla[]) | |
1850 | { | |
1851 | const struct nft_set *set; | |
1852 | struct nft_ctx ctx; | |
1853 | struct sk_buff *skb2; | |
1854 | int err; | |
1855 | ||
1856 | /* Verify existance before starting dump */ | |
1857 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); | |
1858 | if (err < 0) | |
1859 | return err; | |
1860 | ||
1861 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1862 | struct netlink_dump_control c = { | |
1863 | .dump = nf_tables_dump_sets, | |
1864 | }; | |
1865 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1866 | } | |
1867 | ||
1868 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); | |
1869 | if (IS_ERR(set)) | |
1870 | return PTR_ERR(set); | |
1871 | ||
1872 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1873 | if (skb2 == NULL) | |
1874 | return -ENOMEM; | |
1875 | ||
1876 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
1877 | if (err < 0) | |
1878 | goto err; | |
1879 | ||
1880 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1881 | ||
1882 | err: | |
1883 | kfree_skb(skb2); | |
1884 | return err; | |
1885 | } | |
1886 | ||
1887 | static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb, | |
1888 | const struct nlmsghdr *nlh, | |
1889 | const struct nlattr * const nla[]) | |
1890 | { | |
1891 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1892 | const struct nft_set_ops *ops; | |
1893 | const struct nft_af_info *afi; | |
1894 | struct nft_table *table; | |
1895 | struct nft_set *set; | |
1896 | struct nft_ctx ctx; | |
1897 | char name[IFNAMSIZ]; | |
1898 | unsigned int size; | |
1899 | bool create; | |
1900 | u32 ktype, klen, dlen, dtype, flags; | |
1901 | int err; | |
1902 | ||
1903 | if (nla[NFTA_SET_TABLE] == NULL || | |
1904 | nla[NFTA_SET_NAME] == NULL || | |
1905 | nla[NFTA_SET_KEY_LEN] == NULL) | |
1906 | return -EINVAL; | |
1907 | ||
1908 | ktype = NFT_DATA_VALUE; | |
1909 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
1910 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
1911 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
1912 | return -EINVAL; | |
1913 | } | |
1914 | ||
1915 | klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); | |
1916 | if (klen == 0 || klen > FIELD_SIZEOF(struct nft_data, data)) | |
1917 | return -EINVAL; | |
1918 | ||
1919 | flags = 0; | |
1920 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
1921 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
1922 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
1923 | NFT_SET_INTERVAL | NFT_SET_MAP)) | |
1924 | return -EINVAL; | |
1925 | } | |
1926 | ||
1927 | dtype = 0; | |
1928 | dlen = 0; | |
1929 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { | |
1930 | if (!(flags & NFT_SET_MAP)) | |
1931 | return -EINVAL; | |
1932 | ||
1933 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
1934 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
1935 | dtype != NFT_DATA_VERDICT) | |
1936 | return -EINVAL; | |
1937 | ||
1938 | if (dtype != NFT_DATA_VERDICT) { | |
1939 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
1940 | return -EINVAL; | |
1941 | dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); | |
1942 | if (dlen == 0 || | |
1943 | dlen > FIELD_SIZEOF(struct nft_data, data)) | |
1944 | return -EINVAL; | |
1945 | } else | |
1946 | dlen = sizeof(struct nft_data); | |
1947 | } else if (flags & NFT_SET_MAP) | |
1948 | return -EINVAL; | |
1949 | ||
1950 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1951 | ||
1952 | afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, create); | |
1953 | if (IS_ERR(afi)) | |
1954 | return PTR_ERR(afi); | |
1955 | ||
9370761c | 1956 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
1957 | if (IS_ERR(table)) |
1958 | return PTR_ERR(table); | |
1959 | ||
0ca743a5 | 1960 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
1961 | |
1962 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); | |
1963 | if (IS_ERR(set)) { | |
1964 | if (PTR_ERR(set) != -ENOENT) | |
1965 | return PTR_ERR(set); | |
1966 | set = NULL; | |
1967 | } | |
1968 | ||
1969 | if (set != NULL) { | |
1970 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1971 | return -EEXIST; | |
1972 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1973 | return -EOPNOTSUPP; | |
1974 | return 0; | |
1975 | } | |
1976 | ||
1977 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
1978 | return -ENOENT; | |
1979 | ||
1980 | ops = nft_select_set_ops(nla); | |
1981 | if (IS_ERR(ops)) | |
1982 | return PTR_ERR(ops); | |
1983 | ||
1984 | size = 0; | |
1985 | if (ops->privsize != NULL) | |
1986 | size = ops->privsize(nla); | |
1987 | ||
1988 | err = -ENOMEM; | |
1989 | set = kzalloc(sizeof(*set) + size, GFP_KERNEL); | |
1990 | if (set == NULL) | |
1991 | goto err1; | |
1992 | ||
1993 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); | |
1994 | err = nf_tables_set_alloc_name(&ctx, set, name); | |
1995 | if (err < 0) | |
1996 | goto err2; | |
1997 | ||
1998 | INIT_LIST_HEAD(&set->bindings); | |
1999 | set->ops = ops; | |
2000 | set->ktype = ktype; | |
2001 | set->klen = klen; | |
2002 | set->dtype = dtype; | |
2003 | set->dlen = dlen; | |
2004 | set->flags = flags; | |
2005 | ||
2006 | err = ops->init(set, nla); | |
2007 | if (err < 0) | |
2008 | goto err2; | |
2009 | ||
2010 | list_add_tail(&set->list, &table->sets); | |
2011 | nf_tables_set_notify(&ctx, set, NFT_MSG_NEWSET); | |
2012 | return 0; | |
2013 | ||
2014 | err2: | |
2015 | kfree(set); | |
2016 | err1: | |
2017 | module_put(ops->owner); | |
2018 | return err; | |
2019 | } | |
2020 | ||
2021 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) | |
2022 | { | |
2023 | list_del(&set->list); | |
2024 | if (!(set->flags & NFT_SET_ANONYMOUS)) | |
2025 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET); | |
2026 | ||
2027 | set->ops->destroy(set); | |
2028 | module_put(set->ops->owner); | |
2029 | kfree(set); | |
2030 | } | |
2031 | ||
2032 | static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb, | |
2033 | const struct nlmsghdr *nlh, | |
2034 | const struct nlattr * const nla[]) | |
2035 | { | |
2036 | struct nft_set *set; | |
2037 | struct nft_ctx ctx; | |
2038 | int err; | |
2039 | ||
2040 | if (nla[NFTA_SET_TABLE] == NULL) | |
2041 | return -EINVAL; | |
2042 | ||
2043 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); | |
2044 | if (err < 0) | |
2045 | return err; | |
2046 | ||
2047 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); | |
2048 | if (IS_ERR(set)) | |
2049 | return PTR_ERR(set); | |
2050 | if (!list_empty(&set->bindings)) | |
2051 | return -EBUSY; | |
2052 | ||
2053 | nf_tables_set_destroy(&ctx, set); | |
2054 | return 0; | |
2055 | } | |
2056 | ||
2057 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
2058 | const struct nft_set *set, | |
2059 | const struct nft_set_iter *iter, | |
2060 | const struct nft_set_elem *elem) | |
2061 | { | |
2062 | enum nft_registers dreg; | |
2063 | ||
2064 | dreg = nft_type_to_reg(set->dtype); | |
2065 | return nft_validate_data_load(ctx, dreg, &elem->data, set->dtype); | |
2066 | } | |
2067 | ||
2068 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2069 | struct nft_set_binding *binding) | |
2070 | { | |
2071 | struct nft_set_binding *i; | |
2072 | struct nft_set_iter iter; | |
2073 | ||
2074 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
2075 | return -EBUSY; | |
2076 | ||
2077 | if (set->flags & NFT_SET_MAP) { | |
2078 | /* If the set is already bound to the same chain all | |
2079 | * jumps are already validated for that chain. | |
2080 | */ | |
2081 | list_for_each_entry(i, &set->bindings, list) { | |
2082 | if (i->chain == binding->chain) | |
2083 | goto bind; | |
2084 | } | |
2085 | ||
2086 | iter.skip = 0; | |
2087 | iter.count = 0; | |
2088 | iter.err = 0; | |
2089 | iter.fn = nf_tables_bind_check_setelem; | |
2090 | ||
2091 | set->ops->walk(ctx, set, &iter); | |
2092 | if (iter.err < 0) { | |
2093 | /* Destroy anonymous sets if binding fails */ | |
2094 | if (set->flags & NFT_SET_ANONYMOUS) | |
2095 | nf_tables_set_destroy(ctx, set); | |
2096 | ||
2097 | return iter.err; | |
2098 | } | |
2099 | } | |
2100 | bind: | |
2101 | binding->chain = ctx->chain; | |
2102 | list_add_tail(&binding->list, &set->bindings); | |
2103 | return 0; | |
2104 | } | |
2105 | ||
2106 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2107 | struct nft_set_binding *binding) | |
2108 | { | |
2109 | list_del(&binding->list); | |
2110 | ||
2111 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
2112 | nf_tables_set_destroy(ctx, set); | |
2113 | } | |
2114 | ||
2115 | /* | |
2116 | * Set elements | |
2117 | */ | |
2118 | ||
2119 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
2120 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
2121 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
2122 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
2123 | }; | |
2124 | ||
2125 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
2126 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING }, | |
2127 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING }, | |
2128 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, | |
2129 | }; | |
2130 | ||
2131 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, | |
2132 | const struct sk_buff *skb, | |
2133 | const struct nlmsghdr *nlh, | |
2134 | const struct nlattr * const nla[]) | |
2135 | { | |
2136 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
2137 | const struct nft_af_info *afi; | |
2138 | const struct nft_table *table; | |
2139 | ||
2140 | afi = nf_tables_afinfo_lookup(nfmsg->nfgen_family, false); | |
2141 | if (IS_ERR(afi)) | |
2142 | return PTR_ERR(afi); | |
2143 | ||
9370761c | 2144 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]); |
20a69341 PM |
2145 | if (IS_ERR(table)) |
2146 | return PTR_ERR(table); | |
2147 | ||
0ca743a5 | 2148 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2149 | return 0; |
2150 | } | |
2151 | ||
2152 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
2153 | const struct nft_set *set, | |
2154 | const struct nft_set_elem *elem) | |
2155 | { | |
2156 | unsigned char *b = skb_tail_pointer(skb); | |
2157 | struct nlattr *nest; | |
2158 | ||
2159 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
2160 | if (nest == NULL) | |
2161 | goto nla_put_failure; | |
2162 | ||
2163 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE, | |
2164 | set->klen) < 0) | |
2165 | goto nla_put_failure; | |
2166 | ||
2167 | if (set->flags & NFT_SET_MAP && | |
2168 | !(elem->flags & NFT_SET_ELEM_INTERVAL_END) && | |
2169 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data, | |
2170 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
2171 | set->dlen) < 0) | |
2172 | goto nla_put_failure; | |
2173 | ||
2174 | if (elem->flags != 0) | |
2175 | if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags))) | |
2176 | goto nla_put_failure; | |
2177 | ||
2178 | nla_nest_end(skb, nest); | |
2179 | return 0; | |
2180 | ||
2181 | nla_put_failure: | |
2182 | nlmsg_trim(skb, b); | |
2183 | return -EMSGSIZE; | |
2184 | } | |
2185 | ||
2186 | struct nft_set_dump_args { | |
2187 | const struct netlink_callback *cb; | |
2188 | struct nft_set_iter iter; | |
2189 | struct sk_buff *skb; | |
2190 | }; | |
2191 | ||
2192 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
2193 | const struct nft_set *set, | |
2194 | const struct nft_set_iter *iter, | |
2195 | const struct nft_set_elem *elem) | |
2196 | { | |
2197 | struct nft_set_dump_args *args; | |
2198 | ||
2199 | args = container_of(iter, struct nft_set_dump_args, iter); | |
2200 | return nf_tables_fill_setelem(args->skb, set, elem); | |
2201 | } | |
2202 | ||
2203 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) | |
2204 | { | |
2205 | const struct nft_set *set; | |
2206 | struct nft_set_dump_args args; | |
2207 | struct nft_ctx ctx; | |
2208 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; | |
2209 | struct nfgenmsg *nfmsg; | |
2210 | struct nlmsghdr *nlh; | |
2211 | struct nlattr *nest; | |
2212 | u32 portid, seq; | |
2213 | int event, err; | |
2214 | ||
2215 | nfmsg = nlmsg_data(cb->nlh); | |
2216 | err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_ELEM_LIST_MAX, | |
2217 | nft_set_elem_list_policy); | |
2218 | if (err < 0) | |
2219 | return err; | |
2220 | ||
2221 | err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla); | |
2222 | if (err < 0) | |
2223 | return err; | |
2224 | ||
2225 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2226 | if (IS_ERR(set)) | |
2227 | return PTR_ERR(set); | |
2228 | ||
2229 | event = NFT_MSG_NEWSETELEM; | |
2230 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2231 | portid = NETLINK_CB(cb->skb).portid; | |
2232 | seq = cb->nlh->nlmsg_seq; | |
2233 | ||
2234 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2235 | NLM_F_MULTI); | |
2236 | if (nlh == NULL) | |
2237 | goto nla_put_failure; | |
2238 | ||
2239 | nfmsg = nlmsg_data(nlh); | |
2240 | nfmsg->nfgen_family = NFPROTO_UNSPEC; | |
2241 | nfmsg->version = NFNETLINK_V0; | |
2242 | nfmsg->res_id = 0; | |
2243 | ||
2244 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) | |
2245 | goto nla_put_failure; | |
2246 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
2247 | goto nla_put_failure; | |
2248 | ||
2249 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
2250 | if (nest == NULL) | |
2251 | goto nla_put_failure; | |
2252 | ||
2253 | args.cb = cb; | |
2254 | args.skb = skb; | |
2255 | args.iter.skip = cb->args[0]; | |
2256 | args.iter.count = 0; | |
2257 | args.iter.err = 0; | |
2258 | args.iter.fn = nf_tables_dump_setelem; | |
2259 | set->ops->walk(&ctx, set, &args.iter); | |
2260 | ||
2261 | nla_nest_end(skb, nest); | |
2262 | nlmsg_end(skb, nlh); | |
2263 | ||
2264 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
2265 | return args.iter.err; | |
2266 | if (args.iter.count == cb->args[0]) | |
2267 | return 0; | |
2268 | ||
2269 | cb->args[0] = args.iter.count; | |
2270 | return skb->len; | |
2271 | ||
2272 | nla_put_failure: | |
2273 | return -ENOSPC; | |
2274 | } | |
2275 | ||
2276 | static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2277 | const struct nlmsghdr *nlh, | |
2278 | const struct nlattr * const nla[]) | |
2279 | { | |
2280 | const struct nft_set *set; | |
2281 | struct nft_ctx ctx; | |
2282 | int err; | |
2283 | ||
2284 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
2285 | if (err < 0) | |
2286 | return err; | |
2287 | ||
2288 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2289 | if (IS_ERR(set)) | |
2290 | return PTR_ERR(set); | |
2291 | ||
2292 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2293 | struct netlink_dump_control c = { | |
2294 | .dump = nf_tables_dump_set, | |
2295 | }; | |
2296 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
2297 | } | |
2298 | return -EOPNOTSUPP; | |
2299 | } | |
2300 | ||
2301 | static int nft_add_set_elem(const struct nft_ctx *ctx, struct nft_set *set, | |
2302 | const struct nlattr *attr) | |
2303 | { | |
2304 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
2305 | struct nft_data_desc d1, d2; | |
2306 | struct nft_set_elem elem; | |
2307 | struct nft_set_binding *binding; | |
2308 | enum nft_registers dreg; | |
2309 | int err; | |
2310 | ||
2311 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
2312 | nft_set_elem_policy); | |
2313 | if (err < 0) | |
2314 | return err; | |
2315 | ||
2316 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
2317 | return -EINVAL; | |
2318 | ||
2319 | elem.flags = 0; | |
2320 | if (nla[NFTA_SET_ELEM_FLAGS] != NULL) { | |
2321 | elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS])); | |
2322 | if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END) | |
2323 | return -EINVAL; | |
2324 | } | |
2325 | ||
2326 | if (set->flags & NFT_SET_MAP) { | |
2327 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
2328 | !(elem.flags & NFT_SET_ELEM_INTERVAL_END)) | |
2329 | return -EINVAL; | |
2330 | } else { | |
2331 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
2332 | return -EINVAL; | |
2333 | } | |
2334 | ||
2335 | err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]); | |
2336 | if (err < 0) | |
2337 | goto err1; | |
2338 | err = -EINVAL; | |
2339 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
2340 | goto err2; | |
2341 | ||
2342 | err = -EEXIST; | |
2343 | if (set->ops->get(set, &elem) == 0) | |
2344 | goto err2; | |
2345 | ||
2346 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { | |
2347 | err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]); | |
2348 | if (err < 0) | |
2349 | goto err2; | |
2350 | ||
2351 | err = -EINVAL; | |
2352 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
2353 | goto err3; | |
2354 | ||
2355 | dreg = nft_type_to_reg(set->dtype); | |
2356 | list_for_each_entry(binding, &set->bindings, list) { | |
2357 | struct nft_ctx bind_ctx = { | |
2358 | .afi = ctx->afi, | |
2359 | .table = ctx->table, | |
2360 | .chain = binding->chain, | |
2361 | }; | |
2362 | ||
2363 | err = nft_validate_data_load(&bind_ctx, dreg, | |
2364 | &elem.data, d2.type); | |
2365 | if (err < 0) | |
2366 | goto err3; | |
2367 | } | |
2368 | } | |
2369 | ||
2370 | err = set->ops->insert(set, &elem); | |
2371 | if (err < 0) | |
2372 | goto err3; | |
2373 | ||
2374 | return 0; | |
2375 | ||
2376 | err3: | |
2377 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
2378 | nft_data_uninit(&elem.data, d2.type); | |
2379 | err2: | |
2380 | nft_data_uninit(&elem.key, d1.type); | |
2381 | err1: | |
2382 | return err; | |
2383 | } | |
2384 | ||
2385 | static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2386 | const struct nlmsghdr *nlh, | |
2387 | const struct nlattr * const nla[]) | |
2388 | { | |
2389 | const struct nlattr *attr; | |
2390 | struct nft_set *set; | |
2391 | struct nft_ctx ctx; | |
2392 | int rem, err; | |
2393 | ||
2394 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
2395 | if (err < 0) | |
2396 | return err; | |
2397 | ||
2398 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2399 | if (IS_ERR(set)) | |
2400 | return PTR_ERR(set); | |
2401 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
2402 | return -EBUSY; | |
2403 | ||
2404 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
2405 | err = nft_add_set_elem(&ctx, set, attr); | |
2406 | if (err < 0) | |
2407 | return err; | |
2408 | } | |
2409 | return 0; | |
2410 | } | |
2411 | ||
2412 | static int nft_del_setelem(const struct nft_ctx *ctx, struct nft_set *set, | |
2413 | const struct nlattr *attr) | |
2414 | { | |
2415 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
2416 | struct nft_data_desc desc; | |
2417 | struct nft_set_elem elem; | |
2418 | int err; | |
2419 | ||
2420 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
2421 | nft_set_elem_policy); | |
2422 | if (err < 0) | |
2423 | goto err1; | |
2424 | ||
2425 | err = -EINVAL; | |
2426 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
2427 | goto err1; | |
2428 | ||
2429 | err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]); | |
2430 | if (err < 0) | |
2431 | goto err1; | |
2432 | ||
2433 | err = -EINVAL; | |
2434 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
2435 | goto err2; | |
2436 | ||
2437 | err = set->ops->get(set, &elem); | |
2438 | if (err < 0) | |
2439 | goto err2; | |
2440 | ||
2441 | set->ops->remove(set, &elem); | |
2442 | ||
2443 | nft_data_uninit(&elem.key, NFT_DATA_VALUE); | |
2444 | if (set->flags & NFT_SET_MAP) | |
2445 | nft_data_uninit(&elem.data, set->dtype); | |
2446 | ||
2447 | err2: | |
2448 | nft_data_uninit(&elem.key, desc.type); | |
2449 | err1: | |
2450 | return err; | |
2451 | } | |
2452 | ||
2453 | static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2454 | const struct nlmsghdr *nlh, | |
2455 | const struct nlattr * const nla[]) | |
2456 | { | |
2457 | const struct nlattr *attr; | |
2458 | struct nft_set *set; | |
2459 | struct nft_ctx ctx; | |
2460 | int rem, err; | |
2461 | ||
2462 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
2463 | if (err < 0) | |
2464 | return err; | |
2465 | ||
2466 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2467 | if (IS_ERR(set)) | |
2468 | return PTR_ERR(set); | |
2469 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
2470 | return -EBUSY; | |
2471 | ||
2472 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
2473 | err = nft_del_setelem(&ctx, set, attr); | |
2474 | if (err < 0) | |
2475 | return err; | |
2476 | } | |
2477 | return 0; | |
2478 | } | |
2479 | ||
96518518 PM |
2480 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
2481 | [NFT_MSG_NEWTABLE] = { | |
2482 | .call = nf_tables_newtable, | |
2483 | .attr_count = NFTA_TABLE_MAX, | |
2484 | .policy = nft_table_policy, | |
2485 | }, | |
2486 | [NFT_MSG_GETTABLE] = { | |
2487 | .call = nf_tables_gettable, | |
2488 | .attr_count = NFTA_TABLE_MAX, | |
2489 | .policy = nft_table_policy, | |
2490 | }, | |
2491 | [NFT_MSG_DELTABLE] = { | |
2492 | .call = nf_tables_deltable, | |
2493 | .attr_count = NFTA_TABLE_MAX, | |
2494 | .policy = nft_table_policy, | |
2495 | }, | |
2496 | [NFT_MSG_NEWCHAIN] = { | |
2497 | .call = nf_tables_newchain, | |
2498 | .attr_count = NFTA_CHAIN_MAX, | |
2499 | .policy = nft_chain_policy, | |
2500 | }, | |
2501 | [NFT_MSG_GETCHAIN] = { | |
2502 | .call = nf_tables_getchain, | |
2503 | .attr_count = NFTA_CHAIN_MAX, | |
2504 | .policy = nft_chain_policy, | |
2505 | }, | |
2506 | [NFT_MSG_DELCHAIN] = { | |
2507 | .call = nf_tables_delchain, | |
2508 | .attr_count = NFTA_CHAIN_MAX, | |
2509 | .policy = nft_chain_policy, | |
2510 | }, | |
2511 | [NFT_MSG_NEWRULE] = { | |
2512 | .call = nf_tables_newrule, | |
2513 | .attr_count = NFTA_RULE_MAX, | |
2514 | .policy = nft_rule_policy, | |
2515 | }, | |
2516 | [NFT_MSG_GETRULE] = { | |
2517 | .call = nf_tables_getrule, | |
2518 | .attr_count = NFTA_RULE_MAX, | |
2519 | .policy = nft_rule_policy, | |
2520 | }, | |
2521 | [NFT_MSG_DELRULE] = { | |
2522 | .call = nf_tables_delrule, | |
2523 | .attr_count = NFTA_RULE_MAX, | |
2524 | .policy = nft_rule_policy, | |
2525 | }, | |
20a69341 PM |
2526 | [NFT_MSG_NEWSET] = { |
2527 | .call = nf_tables_newset, | |
2528 | .attr_count = NFTA_SET_MAX, | |
2529 | .policy = nft_set_policy, | |
2530 | }, | |
2531 | [NFT_MSG_GETSET] = { | |
2532 | .call = nf_tables_getset, | |
2533 | .attr_count = NFTA_SET_MAX, | |
2534 | .policy = nft_set_policy, | |
2535 | }, | |
2536 | [NFT_MSG_DELSET] = { | |
2537 | .call = nf_tables_delset, | |
2538 | .attr_count = NFTA_SET_MAX, | |
2539 | .policy = nft_set_policy, | |
2540 | }, | |
2541 | [NFT_MSG_NEWSETELEM] = { | |
2542 | .call = nf_tables_newsetelem, | |
2543 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
2544 | .policy = nft_set_elem_list_policy, | |
2545 | }, | |
2546 | [NFT_MSG_GETSETELEM] = { | |
2547 | .call = nf_tables_getsetelem, | |
2548 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
2549 | .policy = nft_set_elem_list_policy, | |
2550 | }, | |
2551 | [NFT_MSG_DELSETELEM] = { | |
2552 | .call = nf_tables_delsetelem, | |
2553 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
2554 | .policy = nft_set_elem_list_policy, | |
2555 | }, | |
96518518 PM |
2556 | }; |
2557 | ||
2558 | static const struct nfnetlink_subsystem nf_tables_subsys = { | |
2559 | .name = "nf_tables", | |
2560 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
2561 | .cb_count = NFT_MSG_MAX, | |
2562 | .cb = nf_tables_cb, | |
2563 | }; | |
2564 | ||
20a69341 PM |
2565 | /* |
2566 | * Loop detection - walk through the ruleset beginning at the destination chain | |
2567 | * of a new jump until either the source chain is reached (loop) or all | |
2568 | * reachable chains have been traversed. | |
2569 | * | |
2570 | * The loop check is performed whenever a new jump verdict is added to an | |
2571 | * expression or verdict map or a verdict map is bound to a new chain. | |
2572 | */ | |
2573 | ||
2574 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
2575 | const struct nft_chain *chain); | |
2576 | ||
2577 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
2578 | const struct nft_set *set, | |
2579 | const struct nft_set_iter *iter, | |
2580 | const struct nft_set_elem *elem) | |
2581 | { | |
2582 | switch (elem->data.verdict) { | |
2583 | case NFT_JUMP: | |
2584 | case NFT_GOTO: | |
2585 | return nf_tables_check_loops(ctx, elem->data.chain); | |
2586 | default: | |
2587 | return 0; | |
2588 | } | |
2589 | } | |
2590 | ||
2591 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
2592 | const struct nft_chain *chain) | |
2593 | { | |
2594 | const struct nft_rule *rule; | |
2595 | const struct nft_expr *expr, *last; | |
20a69341 PM |
2596 | const struct nft_set *set; |
2597 | struct nft_set_binding *binding; | |
2598 | struct nft_set_iter iter; | |
20a69341 PM |
2599 | |
2600 | if (ctx->chain == chain) | |
2601 | return -ELOOP; | |
2602 | ||
2603 | list_for_each_entry(rule, &chain->rules, list) { | |
2604 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
2605 | const struct nft_data *data = NULL; |
2606 | int err; | |
2607 | ||
2608 | if (!expr->ops->validate) | |
20a69341 PM |
2609 | continue; |
2610 | ||
0ca743a5 PNA |
2611 | err = expr->ops->validate(ctx, expr, &data); |
2612 | if (err < 0) | |
2613 | return err; | |
2614 | ||
20a69341 | 2615 | if (data == NULL) |
0ca743a5 | 2616 | continue; |
20a69341 PM |
2617 | |
2618 | switch (data->verdict) { | |
2619 | case NFT_JUMP: | |
2620 | case NFT_GOTO: | |
2621 | err = nf_tables_check_loops(ctx, data->chain); | |
2622 | if (err < 0) | |
2623 | return err; | |
2624 | default: | |
2625 | break; | |
2626 | } | |
2627 | } | |
2628 | } | |
2629 | ||
2630 | list_for_each_entry(set, &ctx->table->sets, list) { | |
2631 | if (!(set->flags & NFT_SET_MAP) || | |
2632 | set->dtype != NFT_DATA_VERDICT) | |
2633 | continue; | |
2634 | ||
2635 | list_for_each_entry(binding, &set->bindings, list) { | |
2636 | if (binding->chain != chain) | |
2637 | continue; | |
2638 | ||
2639 | iter.skip = 0; | |
2640 | iter.count = 0; | |
2641 | iter.err = 0; | |
2642 | iter.fn = nf_tables_loop_check_setelem; | |
2643 | ||
2644 | set->ops->walk(ctx, set, &iter); | |
2645 | if (iter.err < 0) | |
2646 | return iter.err; | |
2647 | } | |
2648 | } | |
2649 | ||
2650 | return 0; | |
2651 | } | |
2652 | ||
96518518 PM |
2653 | /** |
2654 | * nft_validate_input_register - validate an expressions' input register | |
2655 | * | |
2656 | * @reg: the register number | |
2657 | * | |
2658 | * Validate that the input register is one of the general purpose | |
2659 | * registers. | |
2660 | */ | |
2661 | int nft_validate_input_register(enum nft_registers reg) | |
2662 | { | |
2663 | if (reg <= NFT_REG_VERDICT) | |
2664 | return -EINVAL; | |
2665 | if (reg > NFT_REG_MAX) | |
2666 | return -ERANGE; | |
2667 | return 0; | |
2668 | } | |
2669 | EXPORT_SYMBOL_GPL(nft_validate_input_register); | |
2670 | ||
2671 | /** | |
2672 | * nft_validate_output_register - validate an expressions' output register | |
2673 | * | |
2674 | * @reg: the register number | |
2675 | * | |
2676 | * Validate that the output register is one of the general purpose | |
2677 | * registers or the verdict register. | |
2678 | */ | |
2679 | int nft_validate_output_register(enum nft_registers reg) | |
2680 | { | |
2681 | if (reg < NFT_REG_VERDICT) | |
2682 | return -EINVAL; | |
2683 | if (reg > NFT_REG_MAX) | |
2684 | return -ERANGE; | |
2685 | return 0; | |
2686 | } | |
2687 | EXPORT_SYMBOL_GPL(nft_validate_output_register); | |
2688 | ||
2689 | /** | |
2690 | * nft_validate_data_load - validate an expressions' data load | |
2691 | * | |
2692 | * @ctx: context of the expression performing the load | |
2693 | * @reg: the destination register number | |
2694 | * @data: the data to load | |
2695 | * @type: the data type | |
2696 | * | |
2697 | * Validate that a data load uses the appropriate data type for | |
2698 | * the destination register. A value of NULL for the data means | |
2699 | * that its runtime gathered data, which is always of type | |
2700 | * NFT_DATA_VALUE. | |
2701 | */ | |
2702 | int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg, | |
2703 | const struct nft_data *data, | |
2704 | enum nft_data_types type) | |
2705 | { | |
20a69341 PM |
2706 | int err; |
2707 | ||
96518518 PM |
2708 | switch (reg) { |
2709 | case NFT_REG_VERDICT: | |
2710 | if (data == NULL || type != NFT_DATA_VERDICT) | |
2711 | return -EINVAL; | |
20a69341 PM |
2712 | |
2713 | if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) { | |
2714 | err = nf_tables_check_loops(ctx, data->chain); | |
2715 | if (err < 0) | |
2716 | return err; | |
2717 | ||
2718 | if (ctx->chain->level + 1 > data->chain->level) { | |
2719 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) | |
2720 | return -EMLINK; | |
2721 | data->chain->level = ctx->chain->level + 1; | |
2722 | } | |
2723 | } | |
2724 | ||
96518518 PM |
2725 | return 0; |
2726 | default: | |
2727 | if (data != NULL && type != NFT_DATA_VALUE) | |
2728 | return -EINVAL; | |
2729 | return 0; | |
2730 | } | |
2731 | } | |
2732 | EXPORT_SYMBOL_GPL(nft_validate_data_load); | |
2733 | ||
2734 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
2735 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
2736 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
2737 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
2738 | }; | |
2739 | ||
2740 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
2741 | struct nft_data_desc *desc, const struct nlattr *nla) | |
2742 | { | |
2743 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; | |
2744 | struct nft_chain *chain; | |
2745 | int err; | |
2746 | ||
2747 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); | |
2748 | if (err < 0) | |
2749 | return err; | |
2750 | ||
2751 | if (!tb[NFTA_VERDICT_CODE]) | |
2752 | return -EINVAL; | |
2753 | data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); | |
2754 | ||
2755 | switch (data->verdict) { | |
2756 | case NF_ACCEPT: | |
2757 | case NF_DROP: | |
2758 | case NF_QUEUE: | |
2759 | case NFT_CONTINUE: | |
2760 | case NFT_BREAK: | |
2761 | case NFT_RETURN: | |
2762 | desc->len = sizeof(data->verdict); | |
2763 | break; | |
2764 | case NFT_JUMP: | |
2765 | case NFT_GOTO: | |
2766 | if (!tb[NFTA_VERDICT_CHAIN]) | |
2767 | return -EINVAL; | |
2768 | chain = nf_tables_chain_lookup(ctx->table, | |
2769 | tb[NFTA_VERDICT_CHAIN]); | |
2770 | if (IS_ERR(chain)) | |
2771 | return PTR_ERR(chain); | |
2772 | if (chain->flags & NFT_BASE_CHAIN) | |
2773 | return -EOPNOTSUPP; | |
2774 | ||
96518518 PM |
2775 | chain->use++; |
2776 | data->chain = chain; | |
2777 | desc->len = sizeof(data); | |
2778 | break; | |
2779 | default: | |
2780 | return -EINVAL; | |
2781 | } | |
2782 | ||
2783 | desc->type = NFT_DATA_VERDICT; | |
2784 | return 0; | |
2785 | } | |
2786 | ||
2787 | static void nft_verdict_uninit(const struct nft_data *data) | |
2788 | { | |
2789 | switch (data->verdict) { | |
2790 | case NFT_JUMP: | |
2791 | case NFT_GOTO: | |
2792 | data->chain->use--; | |
2793 | break; | |
2794 | } | |
2795 | } | |
2796 | ||
2797 | static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) | |
2798 | { | |
2799 | struct nlattr *nest; | |
2800 | ||
2801 | nest = nla_nest_start(skb, NFTA_DATA_VERDICT); | |
2802 | if (!nest) | |
2803 | goto nla_put_failure; | |
2804 | ||
2805 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict))) | |
2806 | goto nla_put_failure; | |
2807 | ||
2808 | switch (data->verdict) { | |
2809 | case NFT_JUMP: | |
2810 | case NFT_GOTO: | |
2811 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name)) | |
2812 | goto nla_put_failure; | |
2813 | } | |
2814 | nla_nest_end(skb, nest); | |
2815 | return 0; | |
2816 | ||
2817 | nla_put_failure: | |
2818 | return -1; | |
2819 | } | |
2820 | ||
2821 | static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data, | |
2822 | struct nft_data_desc *desc, const struct nlattr *nla) | |
2823 | { | |
2824 | unsigned int len; | |
2825 | ||
2826 | len = nla_len(nla); | |
2827 | if (len == 0) | |
2828 | return -EINVAL; | |
2829 | if (len > sizeof(data->data)) | |
2830 | return -EOVERFLOW; | |
2831 | ||
2832 | nla_memcpy(data->data, nla, sizeof(data->data)); | |
2833 | desc->type = NFT_DATA_VALUE; | |
2834 | desc->len = len; | |
2835 | return 0; | |
2836 | } | |
2837 | ||
2838 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
2839 | unsigned int len) | |
2840 | { | |
2841 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
2842 | } | |
2843 | ||
2844 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
2845 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY, | |
2846 | .len = FIELD_SIZEOF(struct nft_data, data) }, | |
2847 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, | |
2848 | }; | |
2849 | ||
2850 | /** | |
2851 | * nft_data_init - parse nf_tables data netlink attributes | |
2852 | * | |
2853 | * @ctx: context of the expression using the data | |
2854 | * @data: destination struct nft_data | |
2855 | * @desc: data description | |
2856 | * @nla: netlink attribute containing data | |
2857 | * | |
2858 | * Parse the netlink data attributes and initialize a struct nft_data. | |
2859 | * The type and length of data are returned in the data description. | |
2860 | * | |
2861 | * The caller can indicate that it only wants to accept data of type | |
2862 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
2863 | */ | |
2864 | int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, | |
2865 | struct nft_data_desc *desc, const struct nlattr *nla) | |
2866 | { | |
2867 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
2868 | int err; | |
2869 | ||
2870 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); | |
2871 | if (err < 0) | |
2872 | return err; | |
2873 | ||
2874 | if (tb[NFTA_DATA_VALUE]) | |
2875 | return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); | |
2876 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) | |
2877 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
2878 | return -EINVAL; | |
2879 | } | |
2880 | EXPORT_SYMBOL_GPL(nft_data_init); | |
2881 | ||
2882 | /** | |
2883 | * nft_data_uninit - release a nft_data item | |
2884 | * | |
2885 | * @data: struct nft_data to release | |
2886 | * @type: type of data | |
2887 | * | |
2888 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
2889 | * all others need to be released by calling this function. | |
2890 | */ | |
2891 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) | |
2892 | { | |
2893 | switch (type) { | |
2894 | case NFT_DATA_VALUE: | |
2895 | return; | |
2896 | case NFT_DATA_VERDICT: | |
2897 | return nft_verdict_uninit(data); | |
2898 | default: | |
2899 | WARN_ON(1); | |
2900 | } | |
2901 | } | |
2902 | EXPORT_SYMBOL_GPL(nft_data_uninit); | |
2903 | ||
2904 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
2905 | enum nft_data_types type, unsigned int len) | |
2906 | { | |
2907 | struct nlattr *nest; | |
2908 | int err; | |
2909 | ||
2910 | nest = nla_nest_start(skb, attr); | |
2911 | if (nest == NULL) | |
2912 | return -1; | |
2913 | ||
2914 | switch (type) { | |
2915 | case NFT_DATA_VALUE: | |
2916 | err = nft_value_dump(skb, data, len); | |
2917 | break; | |
2918 | case NFT_DATA_VERDICT: | |
2919 | err = nft_verdict_dump(skb, data); | |
2920 | break; | |
2921 | default: | |
2922 | err = -EINVAL; | |
2923 | WARN_ON(1); | |
2924 | } | |
2925 | ||
2926 | nla_nest_end(skb, nest); | |
2927 | return err; | |
2928 | } | |
2929 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
2930 | ||
2931 | static int __init nf_tables_module_init(void) | |
2932 | { | |
2933 | int err; | |
2934 | ||
2935 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
2936 | GFP_KERNEL); | |
2937 | if (info == NULL) { | |
2938 | err = -ENOMEM; | |
2939 | goto err1; | |
2940 | } | |
2941 | ||
2942 | err = nf_tables_core_module_init(); | |
2943 | if (err < 0) | |
2944 | goto err2; | |
2945 | ||
2946 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
2947 | if (err < 0) | |
2948 | goto err3; | |
2949 | ||
2950 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
2951 | return 0; | |
2952 | err3: | |
2953 | nf_tables_core_module_exit(); | |
2954 | err2: | |
2955 | kfree(info); | |
2956 | err1: | |
2957 | return err; | |
2958 | } | |
2959 | ||
2960 | static void __exit nf_tables_module_exit(void) | |
2961 | { | |
2962 | nfnetlink_subsys_unregister(&nf_tables_subsys); | |
2963 | nf_tables_core_module_exit(); | |
2964 | kfree(info); | |
2965 | } | |
2966 | ||
2967 | module_init(nf_tables_module_init); | |
2968 | module_exit(nf_tables_module_exit); | |
2969 | ||
2970 | MODULE_LICENSE("GPL"); | |
2971 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
2972 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |