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> | |
99633ab2 | 21 | #include <net/net_namespace.h> |
96518518 PM |
22 | #include <net/sock.h> |
23 | ||
96518518 PM |
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 | */ | |
99633ab2 | 34 | int nft_register_afinfo(struct net *net, struct nft_af_info *afi) |
96518518 PM |
35 | { |
36 | INIT_LIST_HEAD(&afi->tables); | |
37 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
99633ab2 | 38 | list_add_tail(&afi->list, &net->nft.af_info); |
96518518 PM |
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 | ||
99633ab2 | 59 | static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family) |
96518518 PM |
60 | { |
61 | struct nft_af_info *afi; | |
62 | ||
99633ab2 | 63 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
64 | if (afi->family == family) |
65 | return afi; | |
66 | } | |
67 | return NULL; | |
68 | } | |
69 | ||
99633ab2 PNA |
70 | static struct nft_af_info * |
71 | nf_tables_afinfo_lookup(struct net *net, int family, bool autoload) | |
96518518 PM |
72 | { |
73 | struct nft_af_info *afi; | |
74 | ||
99633ab2 | 75 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
76 | if (afi != NULL) |
77 | return afi; | |
78 | #ifdef CONFIG_MODULES | |
79 | if (autoload) { | |
80 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
81 | request_module("nft-afinfo-%u", family); | |
82 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
99633ab2 | 83 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
84 | if (afi != NULL) |
85 | return ERR_PTR(-EAGAIN); | |
86 | } | |
87 | #endif | |
88 | return ERR_PTR(-EAFNOSUPPORT); | |
89 | } | |
90 | ||
91 | /* | |
92 | * Tables | |
93 | */ | |
94 | ||
95 | static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, | |
96 | const struct nlattr *nla) | |
97 | { | |
98 | struct nft_table *table; | |
99 | ||
100 | list_for_each_entry(table, &afi->tables, list) { | |
101 | if (!nla_strcmp(nla, table->name)) | |
102 | return table; | |
103 | } | |
104 | return NULL; | |
105 | } | |
106 | ||
107 | static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, | |
9370761c | 108 | const struct nlattr *nla) |
96518518 PM |
109 | { |
110 | struct nft_table *table; | |
111 | ||
112 | if (nla == NULL) | |
113 | return ERR_PTR(-EINVAL); | |
114 | ||
115 | table = nft_table_lookup(afi, nla); | |
116 | if (table != NULL) | |
117 | return table; | |
118 | ||
96518518 PM |
119 | return ERR_PTR(-ENOENT); |
120 | } | |
121 | ||
122 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) | |
123 | { | |
124 | return ++table->hgenerator; | |
125 | } | |
126 | ||
2a37d755 | 127 | static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX]; |
9370761c | 128 | |
2a37d755 | 129 | static const struct nf_chain_type * |
baae3e62 | 130 | __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
9370761c PNA |
131 | { |
132 | int i; | |
133 | ||
baae3e62 | 134 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
135 | if (chain_type[family][i] != NULL && |
136 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 137 | return chain_type[family][i]; |
9370761c | 138 | } |
baae3e62 | 139 | return NULL; |
9370761c PNA |
140 | } |
141 | ||
2a37d755 | 142 | static const struct nf_chain_type * |
baae3e62 PM |
143 | nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
144 | const struct nlattr *nla, | |
145 | bool autoload) | |
9370761c | 146 | { |
2a37d755 | 147 | const struct nf_chain_type *type; |
9370761c PNA |
148 | |
149 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
150 | if (type != NULL) |
151 | return type; | |
9370761c | 152 | #ifdef CONFIG_MODULES |
93b0806f | 153 | if (autoload) { |
9370761c PNA |
154 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
155 | request_module("nft-chain-%u-%*.s", afi->family, | |
156 | nla_len(nla)-1, (const char *)nla_data(nla)); | |
157 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
158 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
159 | if (type != NULL) |
160 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
161 | } |
162 | #endif | |
93b0806f | 163 | return ERR_PTR(-ENOENT); |
9370761c PNA |
164 | } |
165 | ||
96518518 PM |
166 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
167 | [NFTA_TABLE_NAME] = { .type = NLA_STRING }, | |
9ddf6323 | 168 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
169 | }; |
170 | ||
171 | static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq, | |
172 | int event, u32 flags, int family, | |
173 | const struct nft_table *table) | |
174 | { | |
175 | struct nlmsghdr *nlh; | |
176 | struct nfgenmsg *nfmsg; | |
177 | ||
178 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
179 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
180 | if (nlh == NULL) | |
181 | goto nla_put_failure; | |
182 | ||
183 | nfmsg = nlmsg_data(nlh); | |
184 | nfmsg->nfgen_family = family; | |
185 | nfmsg->version = NFNETLINK_V0; | |
186 | nfmsg->res_id = 0; | |
187 | ||
9ddf6323 | 188 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 TB |
189 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
190 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) | |
96518518 PM |
191 | goto nla_put_failure; |
192 | ||
193 | return nlmsg_end(skb, nlh); | |
194 | ||
195 | nla_put_failure: | |
196 | nlmsg_trim(skb, nlh); | |
197 | return -1; | |
198 | } | |
199 | ||
200 | static int nf_tables_table_notify(const struct sk_buff *oskb, | |
201 | const struct nlmsghdr *nlh, | |
202 | const struct nft_table *table, | |
203 | int event, int family) | |
204 | { | |
205 | struct sk_buff *skb; | |
206 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
207 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
208 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
209 | bool report; | |
210 | int err; | |
211 | ||
212 | report = nlh ? nlmsg_report(nlh) : false; | |
213 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
214 | return 0; | |
215 | ||
216 | err = -ENOBUFS; | |
217 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
218 | if (skb == NULL) | |
219 | goto err; | |
220 | ||
221 | err = nf_tables_fill_table_info(skb, portid, seq, event, 0, | |
222 | family, table); | |
223 | if (err < 0) { | |
224 | kfree_skb(skb); | |
225 | goto err; | |
226 | } | |
227 | ||
228 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
229 | GFP_KERNEL); | |
230 | err: | |
231 | if (err < 0) | |
232 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
233 | return err; | |
234 | } | |
235 | ||
236 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
237 | struct netlink_callback *cb) | |
238 | { | |
239 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
240 | const struct nft_af_info *afi; | |
241 | const struct nft_table *table; | |
242 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 243 | struct net *net = sock_net(skb->sk); |
96518518 PM |
244 | int family = nfmsg->nfgen_family; |
245 | ||
99633ab2 | 246 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
247 | if (family != NFPROTO_UNSPEC && family != afi->family) |
248 | continue; | |
249 | ||
250 | list_for_each_entry(table, &afi->tables, list) { | |
251 | if (idx < s_idx) | |
252 | goto cont; | |
253 | if (idx > s_idx) | |
254 | memset(&cb->args[1], 0, | |
255 | sizeof(cb->args) - sizeof(cb->args[0])); | |
256 | if (nf_tables_fill_table_info(skb, | |
257 | NETLINK_CB(cb->skb).portid, | |
258 | cb->nlh->nlmsg_seq, | |
259 | NFT_MSG_NEWTABLE, | |
260 | NLM_F_MULTI, | |
261 | afi->family, table) < 0) | |
262 | goto done; | |
263 | cont: | |
264 | idx++; | |
265 | } | |
266 | } | |
267 | done: | |
268 | cb->args[0] = idx; | |
269 | return skb->len; | |
270 | } | |
271 | ||
272 | static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb, | |
273 | const struct nlmsghdr *nlh, | |
274 | const struct nlattr * const nla[]) | |
275 | { | |
276 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
277 | const struct nft_af_info *afi; | |
278 | const struct nft_table *table; | |
279 | struct sk_buff *skb2; | |
99633ab2 | 280 | struct net *net = sock_net(skb->sk); |
96518518 PM |
281 | int family = nfmsg->nfgen_family; |
282 | int err; | |
283 | ||
284 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
285 | struct netlink_dump_control c = { | |
286 | .dump = nf_tables_dump_tables, | |
287 | }; | |
288 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
289 | } | |
290 | ||
99633ab2 | 291 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
292 | if (IS_ERR(afi)) |
293 | return PTR_ERR(afi); | |
294 | ||
9370761c | 295 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
296 | if (IS_ERR(table)) |
297 | return PTR_ERR(table); | |
298 | ||
299 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
300 | if (!skb2) | |
301 | return -ENOMEM; | |
302 | ||
303 | err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid, | |
304 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, | |
305 | family, table); | |
306 | if (err < 0) | |
307 | goto err; | |
308 | ||
309 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
310 | ||
311 | err: | |
312 | kfree_skb(skb2); | |
313 | return err; | |
314 | } | |
315 | ||
115a60b1 PM |
316 | static int nf_tables_table_enable(const struct nft_af_info *afi, |
317 | struct nft_table *table) | |
9ddf6323 PNA |
318 | { |
319 | struct nft_chain *chain; | |
320 | int err, i = 0; | |
321 | ||
322 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
323 | if (!(chain->flags & NFT_BASE_CHAIN)) |
324 | continue; | |
325 | ||
115a60b1 | 326 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
327 | if (err < 0) |
328 | goto err; | |
329 | ||
330 | i++; | |
331 | } | |
332 | return 0; | |
333 | err: | |
334 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
335 | if (!(chain->flags & NFT_BASE_CHAIN)) |
336 | continue; | |
337 | ||
9ddf6323 PNA |
338 | if (i-- <= 0) |
339 | break; | |
340 | ||
115a60b1 | 341 | nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
342 | } |
343 | return err; | |
344 | } | |
345 | ||
115a60b1 PM |
346 | static int nf_tables_table_disable(const struct nft_af_info *afi, |
347 | struct nft_table *table) | |
9ddf6323 PNA |
348 | { |
349 | struct nft_chain *chain; | |
350 | ||
d2012975 PNA |
351 | list_for_each_entry(chain, &table->chains, list) { |
352 | if (chain->flags & NFT_BASE_CHAIN) | |
115a60b1 PM |
353 | nf_unregister_hooks(nft_base_chain(chain)->ops, |
354 | afi->nops); | |
d2012975 | 355 | } |
9ddf6323 PNA |
356 | |
357 | return 0; | |
358 | } | |
359 | ||
360 | static int nf_tables_updtable(struct sock *nlsk, struct sk_buff *skb, | |
361 | const struct nlmsghdr *nlh, | |
362 | const struct nlattr * const nla[], | |
363 | struct nft_af_info *afi, struct nft_table *table) | |
364 | { | |
365 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
366 | int family = nfmsg->nfgen_family, ret = 0; | |
367 | ||
368 | if (nla[NFTA_TABLE_FLAGS]) { | |
c5c1f975 | 369 | u32 flags; |
9ddf6323 PNA |
370 | |
371 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
372 | if (flags & ~NFT_TABLE_F_DORMANT) | |
373 | return -EINVAL; | |
374 | ||
375 | if ((flags & NFT_TABLE_F_DORMANT) && | |
376 | !(table->flags & NFT_TABLE_F_DORMANT)) { | |
115a60b1 | 377 | ret = nf_tables_table_disable(afi, table); |
9ddf6323 PNA |
378 | if (ret >= 0) |
379 | table->flags |= NFT_TABLE_F_DORMANT; | |
380 | } else if (!(flags & NFT_TABLE_F_DORMANT) && | |
381 | table->flags & NFT_TABLE_F_DORMANT) { | |
115a60b1 | 382 | ret = nf_tables_table_enable(afi, table); |
9ddf6323 PNA |
383 | if (ret >= 0) |
384 | table->flags &= ~NFT_TABLE_F_DORMANT; | |
385 | } | |
386 | if (ret < 0) | |
387 | goto err; | |
388 | } | |
389 | ||
390 | nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family); | |
391 | err: | |
392 | return ret; | |
393 | } | |
394 | ||
96518518 PM |
395 | static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb, |
396 | const struct nlmsghdr *nlh, | |
397 | const struct nlattr * const nla[]) | |
398 | { | |
399 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
400 | const struct nlattr *name; | |
401 | struct nft_af_info *afi; | |
402 | struct nft_table *table; | |
99633ab2 | 403 | struct net *net = sock_net(skb->sk); |
96518518 | 404 | int family = nfmsg->nfgen_family; |
c5c1f975 | 405 | u32 flags = 0; |
96518518 | 406 | |
99633ab2 | 407 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
408 | if (IS_ERR(afi)) |
409 | return PTR_ERR(afi); | |
410 | ||
411 | name = nla[NFTA_TABLE_NAME]; | |
9370761c | 412 | table = nf_tables_table_lookup(afi, name); |
96518518 PM |
413 | if (IS_ERR(table)) { |
414 | if (PTR_ERR(table) != -ENOENT) | |
415 | return PTR_ERR(table); | |
416 | table = NULL; | |
417 | } | |
418 | ||
419 | if (table != NULL) { | |
420 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
421 | return -EEXIST; | |
422 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
423 | return -EOPNOTSUPP; | |
9ddf6323 | 424 | return nf_tables_updtable(nlsk, skb, nlh, nla, afi, table); |
96518518 PM |
425 | } |
426 | ||
c5c1f975 PM |
427 | if (nla[NFTA_TABLE_FLAGS]) { |
428 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
429 | if (flags & ~NFT_TABLE_F_DORMANT) | |
430 | return -EINVAL; | |
431 | } | |
432 | ||
7047f9d0 PM |
433 | if (!try_module_get(afi->owner)) |
434 | return -EAFNOSUPPORT; | |
435 | ||
96518518 | 436 | table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL); |
7047f9d0 PM |
437 | if (table == NULL) { |
438 | module_put(afi->owner); | |
96518518 | 439 | return -ENOMEM; |
7047f9d0 | 440 | } |
96518518 PM |
441 | |
442 | nla_strlcpy(table->name, name, nla_len(name)); | |
443 | INIT_LIST_HEAD(&table->chains); | |
20a69341 | 444 | INIT_LIST_HEAD(&table->sets); |
c5c1f975 | 445 | table->flags = flags; |
9ddf6323 | 446 | |
96518518 PM |
447 | list_add_tail(&table->list, &afi->tables); |
448 | nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family); | |
449 | return 0; | |
450 | } | |
451 | ||
452 | static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb, | |
453 | const struct nlmsghdr *nlh, | |
454 | const struct nlattr * const nla[]) | |
455 | { | |
456 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
457 | struct nft_af_info *afi; | |
458 | struct nft_table *table; | |
99633ab2 | 459 | struct net *net = sock_net(skb->sk); |
96518518 PM |
460 | int family = nfmsg->nfgen_family; |
461 | ||
99633ab2 | 462 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
463 | if (IS_ERR(afi)) |
464 | return PTR_ERR(afi); | |
465 | ||
9370761c | 466 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
467 | if (IS_ERR(table)) |
468 | return PTR_ERR(table); | |
469 | ||
44a6f0df | 470 | if (!list_empty(&table->chains) || !list_empty(&table->sets)) |
96518518 PM |
471 | return -EBUSY; |
472 | ||
473 | list_del(&table->list); | |
474 | nf_tables_table_notify(skb, nlh, table, NFT_MSG_DELTABLE, family); | |
475 | kfree(table); | |
7047f9d0 | 476 | module_put(afi->owner); |
96518518 PM |
477 | return 0; |
478 | } | |
479 | ||
2a37d755 | 480 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 481 | { |
9370761c | 482 | int err = 0; |
96518518 PM |
483 | |
484 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
9370761c PNA |
485 | if (chain_type[ctype->family][ctype->type] != NULL) { |
486 | err = -EBUSY; | |
487 | goto out; | |
96518518 | 488 | } |
9370761c PNA |
489 | chain_type[ctype->family][ctype->type] = ctype; |
490 | out: | |
96518518 PM |
491 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
492 | return err; | |
493 | } | |
9370761c | 494 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 495 | |
2a37d755 | 496 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 497 | { |
96518518 | 498 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 499 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
500 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
501 | } | |
9370761c | 502 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
503 | |
504 | /* | |
505 | * Chains | |
506 | */ | |
507 | ||
508 | static struct nft_chain * | |
509 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) | |
510 | { | |
511 | struct nft_chain *chain; | |
512 | ||
513 | list_for_each_entry(chain, &table->chains, list) { | |
514 | if (chain->handle == handle) | |
515 | return chain; | |
516 | } | |
517 | ||
518 | return ERR_PTR(-ENOENT); | |
519 | } | |
520 | ||
521 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
522 | const struct nlattr *nla) | |
523 | { | |
524 | struct nft_chain *chain; | |
525 | ||
526 | if (nla == NULL) | |
527 | return ERR_PTR(-EINVAL); | |
528 | ||
529 | list_for_each_entry(chain, &table->chains, list) { | |
530 | if (!nla_strcmp(nla, chain->name)) | |
531 | return chain; | |
532 | } | |
533 | ||
534 | return ERR_PTR(-ENOENT); | |
535 | } | |
536 | ||
537 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
538 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, | |
539 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, | |
540 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
541 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
542 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 543 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
9370761c | 544 | [NFTA_CHAIN_TYPE] = { .type = NLA_NUL_STRING }, |
0ca743a5 | 545 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
546 | }; |
547 | ||
548 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
549 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
550 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
551 | }; | |
552 | ||
0ca743a5 PNA |
553 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
554 | { | |
555 | struct nft_stats *cpu_stats, total; | |
556 | struct nlattr *nest; | |
557 | int cpu; | |
558 | ||
559 | memset(&total, 0, sizeof(total)); | |
560 | for_each_possible_cpu(cpu) { | |
561 | cpu_stats = per_cpu_ptr(stats, cpu); | |
562 | total.pkts += cpu_stats->pkts; | |
563 | total.bytes += cpu_stats->bytes; | |
564 | } | |
565 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
566 | if (nest == NULL) | |
567 | goto nla_put_failure; | |
568 | ||
569 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) || | |
570 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes))) | |
571 | goto nla_put_failure; | |
572 | ||
573 | nla_nest_end(skb, nest); | |
574 | return 0; | |
575 | ||
576 | nla_put_failure: | |
577 | return -ENOSPC; | |
578 | } | |
579 | ||
96518518 PM |
580 | static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq, |
581 | int event, u32 flags, int family, | |
582 | const struct nft_table *table, | |
583 | const struct nft_chain *chain) | |
584 | { | |
585 | struct nlmsghdr *nlh; | |
586 | struct nfgenmsg *nfmsg; | |
587 | ||
588 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
589 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
590 | if (nlh == NULL) | |
591 | goto nla_put_failure; | |
592 | ||
593 | nfmsg = nlmsg_data(nlh); | |
594 | nfmsg->nfgen_family = family; | |
595 | nfmsg->version = NFNETLINK_V0; | |
596 | nfmsg->res_id = 0; | |
597 | ||
598 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
599 | goto nla_put_failure; | |
600 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle))) | |
601 | goto nla_put_failure; | |
602 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
603 | goto nla_put_failure; | |
604 | ||
605 | if (chain->flags & NFT_BASE_CHAIN) { | |
0ca743a5 | 606 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 607 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
608 | struct nlattr *nest; |
609 | ||
610 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
611 | if (nest == NULL) |
612 | goto nla_put_failure; | |
613 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
614 | goto nla_put_failure; | |
615 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
616 | goto nla_put_failure; | |
617 | nla_nest_end(skb, nest); | |
9370761c | 618 | |
0ca743a5 PNA |
619 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
620 | htonl(basechain->policy))) | |
621 | goto nla_put_failure; | |
622 | ||
baae3e62 PM |
623 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
624 | goto nla_put_failure; | |
0ca743a5 PNA |
625 | |
626 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
627 | goto nla_put_failure; | |
96518518 PM |
628 | } |
629 | ||
0ca743a5 PNA |
630 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
631 | goto nla_put_failure; | |
632 | ||
96518518 PM |
633 | return nlmsg_end(skb, nlh); |
634 | ||
635 | nla_put_failure: | |
636 | nlmsg_trim(skb, nlh); | |
637 | return -1; | |
638 | } | |
639 | ||
640 | static int nf_tables_chain_notify(const struct sk_buff *oskb, | |
641 | const struct nlmsghdr *nlh, | |
642 | const struct nft_table *table, | |
643 | const struct nft_chain *chain, | |
644 | int event, int family) | |
645 | { | |
646 | struct sk_buff *skb; | |
647 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
648 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
649 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
650 | bool report; | |
651 | int err; | |
652 | ||
653 | report = nlh ? nlmsg_report(nlh) : false; | |
654 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
655 | return 0; | |
656 | ||
657 | err = -ENOBUFS; | |
658 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
659 | if (skb == NULL) | |
660 | goto err; | |
661 | ||
662 | err = nf_tables_fill_chain_info(skb, portid, seq, event, 0, family, | |
663 | table, chain); | |
664 | if (err < 0) { | |
665 | kfree_skb(skb); | |
666 | goto err; | |
667 | } | |
668 | ||
669 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
670 | GFP_KERNEL); | |
671 | err: | |
672 | if (err < 0) | |
673 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
674 | return err; | |
675 | } | |
676 | ||
677 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
678 | struct netlink_callback *cb) | |
679 | { | |
680 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
681 | const struct nft_af_info *afi; | |
682 | const struct nft_table *table; | |
683 | const struct nft_chain *chain; | |
684 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 685 | struct net *net = sock_net(skb->sk); |
96518518 PM |
686 | int family = nfmsg->nfgen_family; |
687 | ||
99633ab2 | 688 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
689 | if (family != NFPROTO_UNSPEC && family != afi->family) |
690 | continue; | |
691 | ||
692 | list_for_each_entry(table, &afi->tables, list) { | |
693 | list_for_each_entry(chain, &table->chains, list) { | |
694 | if (idx < s_idx) | |
695 | goto cont; | |
696 | if (idx > s_idx) | |
697 | memset(&cb->args[1], 0, | |
698 | sizeof(cb->args) - sizeof(cb->args[0])); | |
699 | if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid, | |
700 | cb->nlh->nlmsg_seq, | |
701 | NFT_MSG_NEWCHAIN, | |
702 | NLM_F_MULTI, | |
703 | afi->family, table, chain) < 0) | |
704 | goto done; | |
705 | cont: | |
706 | idx++; | |
707 | } | |
708 | } | |
709 | } | |
710 | done: | |
711 | cb->args[0] = idx; | |
712 | return skb->len; | |
713 | } | |
714 | ||
715 | ||
716 | static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb, | |
717 | const struct nlmsghdr *nlh, | |
718 | const struct nlattr * const nla[]) | |
719 | { | |
720 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
721 | const struct nft_af_info *afi; | |
722 | const struct nft_table *table; | |
723 | const struct nft_chain *chain; | |
724 | struct sk_buff *skb2; | |
99633ab2 | 725 | struct net *net = sock_net(skb->sk); |
96518518 PM |
726 | int family = nfmsg->nfgen_family; |
727 | int err; | |
728 | ||
729 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
730 | struct netlink_dump_control c = { | |
731 | .dump = nf_tables_dump_chains, | |
732 | }; | |
733 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
734 | } | |
735 | ||
99633ab2 | 736 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
737 | if (IS_ERR(afi)) |
738 | return PTR_ERR(afi); | |
739 | ||
9370761c | 740 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
741 | if (IS_ERR(table)) |
742 | return PTR_ERR(table); | |
743 | ||
744 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
745 | if (IS_ERR(chain)) | |
746 | return PTR_ERR(chain); | |
747 | ||
748 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
749 | if (!skb2) | |
750 | return -ENOMEM; | |
751 | ||
752 | err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid, | |
753 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, | |
754 | family, table, chain); | |
755 | if (err < 0) | |
756 | goto err; | |
757 | ||
758 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
759 | ||
760 | err: | |
761 | kfree_skb(skb2); | |
762 | return err; | |
763 | } | |
764 | ||
0ca743a5 PNA |
765 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
766 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
767 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
768 | }; | |
769 | ||
770 | static int | |
771 | nf_tables_counters(struct nft_base_chain *chain, const struct nlattr *attr) | |
772 | { | |
773 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
774 | struct nft_stats __percpu *newstats; | |
775 | struct nft_stats *stats; | |
776 | int err; | |
777 | ||
778 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); | |
779 | if (err < 0) | |
780 | return err; | |
781 | ||
782 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
783 | return -EINVAL; | |
784 | ||
785 | newstats = alloc_percpu(struct nft_stats); | |
786 | if (newstats == NULL) | |
787 | return -ENOMEM; | |
788 | ||
789 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
790 | * are not exposed to userspace. | |
791 | */ | |
792 | stats = this_cpu_ptr(newstats); | |
793 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
794 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
795 | ||
796 | if (chain->stats) { | |
797 | /* nfnl_lock is held, add some nfnl function for this, later */ | |
798 | struct nft_stats __percpu *oldstats = | |
799 | rcu_dereference_protected(chain->stats, 1); | |
800 | ||
801 | rcu_assign_pointer(chain->stats, newstats); | |
802 | synchronize_rcu(); | |
803 | free_percpu(oldstats); | |
804 | } else | |
805 | rcu_assign_pointer(chain->stats, newstats); | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
96518518 PM |
810 | static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb, |
811 | const struct nlmsghdr *nlh, | |
812 | const struct nlattr * const nla[]) | |
813 | { | |
814 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
815 | const struct nlattr * uninitialized_var(name); | |
816 | const struct nft_af_info *afi; | |
817 | struct nft_table *table; | |
818 | struct nft_chain *chain; | |
0ca743a5 | 819 | struct nft_base_chain *basechain = NULL; |
96518518 | 820 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
99633ab2 | 821 | struct net *net = sock_net(skb->sk); |
96518518 | 822 | int family = nfmsg->nfgen_family; |
57de2a0c | 823 | u8 policy = NF_ACCEPT; |
96518518 | 824 | u64 handle = 0; |
115a60b1 | 825 | unsigned int i; |
96518518 PM |
826 | int err; |
827 | bool create; | |
828 | ||
829 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
830 | ||
99633ab2 | 831 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
832 | if (IS_ERR(afi)) |
833 | return PTR_ERR(afi); | |
834 | ||
9370761c | 835 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
836 | if (IS_ERR(table)) |
837 | return PTR_ERR(table); | |
838 | ||
96518518 PM |
839 | chain = NULL; |
840 | name = nla[NFTA_CHAIN_NAME]; | |
841 | ||
842 | if (nla[NFTA_CHAIN_HANDLE]) { | |
843 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
844 | chain = nf_tables_chain_lookup_byhandle(table, handle); | |
845 | if (IS_ERR(chain)) | |
846 | return PTR_ERR(chain); | |
847 | } else { | |
848 | chain = nf_tables_chain_lookup(table, name); | |
849 | if (IS_ERR(chain)) { | |
850 | if (PTR_ERR(chain) != -ENOENT) | |
851 | return PTR_ERR(chain); | |
852 | chain = NULL; | |
853 | } | |
854 | } | |
855 | ||
57de2a0c PM |
856 | if (nla[NFTA_CHAIN_POLICY]) { |
857 | if ((chain != NULL && | |
858 | !(chain->flags & NFT_BASE_CHAIN)) || | |
859 | nla[NFTA_CHAIN_HOOK] == NULL) | |
860 | return -EOPNOTSUPP; | |
861 | ||
8f46df18 | 862 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
863 | switch (policy) { |
864 | case NF_DROP: | |
865 | case NF_ACCEPT: | |
866 | break; | |
867 | default: | |
868 | return -EINVAL; | |
869 | } | |
870 | } | |
871 | ||
96518518 PM |
872 | if (chain != NULL) { |
873 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
874 | return -EEXIST; | |
875 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
876 | return -EOPNOTSUPP; | |
877 | ||
878 | if (nla[NFTA_CHAIN_HANDLE] && name && | |
879 | !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) | |
880 | return -EEXIST; | |
881 | ||
0ca743a5 PNA |
882 | if (nla[NFTA_CHAIN_COUNTERS]) { |
883 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
884 | return -EOPNOTSUPP; | |
885 | ||
886 | err = nf_tables_counters(nft_base_chain(chain), | |
887 | nla[NFTA_CHAIN_COUNTERS]); | |
888 | if (err < 0) | |
889 | return err; | |
890 | } | |
891 | ||
4401a862 PM |
892 | if (nla[NFTA_CHAIN_POLICY]) |
893 | nft_base_chain(chain)->policy = policy; | |
894 | ||
96518518 PM |
895 | if (nla[NFTA_CHAIN_HANDLE] && name) |
896 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); | |
897 | ||
898 | goto notify; | |
899 | } | |
900 | ||
75820676 PM |
901 | if (table->use == UINT_MAX) |
902 | return -EOVERFLOW; | |
903 | ||
96518518 | 904 | if (nla[NFTA_CHAIN_HOOK]) { |
2a37d755 | 905 | const struct nf_chain_type *type; |
96518518 | 906 | struct nf_hook_ops *ops; |
9370761c | 907 | nf_hookfn *hookfn; |
115a60b1 | 908 | u32 hooknum, priority; |
9370761c | 909 | |
baae3e62 | 910 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
9370761c PNA |
911 | if (nla[NFTA_CHAIN_TYPE]) { |
912 | type = nf_tables_chain_type_lookup(afi, | |
913 | nla[NFTA_CHAIN_TYPE], | |
914 | create); | |
93b0806f PM |
915 | if (IS_ERR(type)) |
916 | return PTR_ERR(type); | |
9370761c | 917 | } |
96518518 PM |
918 | |
919 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
920 | nft_hook_policy); | |
921 | if (err < 0) | |
922 | return err; | |
923 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
924 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
925 | return -EINVAL; | |
9370761c PNA |
926 | |
927 | hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
928 | if (hooknum >= afi->nhooks) | |
96518518 | 929 | return -EINVAL; |
115a60b1 | 930 | priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
96518518 | 931 | |
baae3e62 | 932 | if (!(type->hook_mask & (1 << hooknum))) |
9370761c | 933 | return -EOPNOTSUPP; |
fa2c1de0 | 934 | if (!try_module_get(type->owner)) |
baae3e62 | 935 | return -ENOENT; |
fa2c1de0 | 936 | hookfn = type->hooks[hooknum]; |
9370761c | 937 | |
96518518 PM |
938 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
939 | if (basechain == NULL) | |
940 | return -ENOMEM; | |
9370761c | 941 | |
4401a862 PM |
942 | if (nla[NFTA_CHAIN_COUNTERS]) { |
943 | err = nf_tables_counters(basechain, | |
944 | nla[NFTA_CHAIN_COUNTERS]); | |
945 | if (err < 0) { | |
fa2c1de0 | 946 | module_put(type->owner); |
4401a862 PM |
947 | kfree(basechain); |
948 | return err; | |
949 | } | |
950 | } else { | |
951 | struct nft_stats __percpu *newstats; | |
952 | ||
953 | newstats = alloc_percpu(struct nft_stats); | |
954 | if (newstats == NULL) { | |
fa2c1de0 | 955 | module_put(type->owner); |
4401a862 PM |
956 | kfree(basechain); |
957 | return -ENOMEM; | |
958 | } | |
959 | rcu_assign_pointer(basechain->stats, newstats); | |
960 | } | |
961 | ||
9370761c | 962 | basechain->type = type; |
96518518 PM |
963 | chain = &basechain->chain; |
964 | ||
115a60b1 PM |
965 | for (i = 0; i < afi->nops; i++) { |
966 | ops = &basechain->ops[i]; | |
967 | ops->pf = family; | |
968 | ops->owner = afi->owner; | |
969 | ops->hooknum = hooknum; | |
970 | ops->priority = priority; | |
971 | ops->priv = chain; | |
972 | ops->hook = afi->hooks[ops->hooknum]; | |
973 | if (hookfn) | |
974 | ops->hook = hookfn; | |
975 | if (afi->hook_ops_init) | |
976 | afi->hook_ops_init(ops, i); | |
977 | } | |
96518518 PM |
978 | |
979 | chain->flags |= NFT_BASE_CHAIN; | |
57de2a0c | 980 | basechain->policy = policy; |
96518518 PM |
981 | } else { |
982 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
983 | if (chain == NULL) | |
984 | return -ENOMEM; | |
985 | } | |
986 | ||
987 | INIT_LIST_HEAD(&chain->rules); | |
988 | chain->handle = nf_tables_alloc_handle(table); | |
0628b123 | 989 | chain->net = net; |
b5bc89bf | 990 | chain->table = table; |
96518518 PM |
991 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
992 | ||
9ddf6323 PNA |
993 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
994 | chain->flags & NFT_BASE_CHAIN) { | |
115a60b1 | 995 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
0ca743a5 | 996 | if (err < 0) { |
fa2c1de0 | 997 | module_put(basechain->type->owner); |
0ca743a5 PNA |
998 | free_percpu(basechain->stats); |
999 | kfree(basechain); | |
1000 | return err; | |
1001 | } | |
1002 | } | |
9ddf6323 PNA |
1003 | list_add_tail(&chain->list, &table->chains); |
1004 | table->use++; | |
96518518 PM |
1005 | notify: |
1006 | nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_NEWCHAIN, | |
1007 | family); | |
1008 | return 0; | |
1009 | } | |
1010 | ||
1011 | static void nf_tables_rcu_chain_destroy(struct rcu_head *head) | |
1012 | { | |
1013 | struct nft_chain *chain = container_of(head, struct nft_chain, rcu_head); | |
1014 | ||
1015 | BUG_ON(chain->use > 0); | |
1016 | ||
0ca743a5 | 1017 | if (chain->flags & NFT_BASE_CHAIN) { |
fa2c1de0 | 1018 | module_put(nft_base_chain(chain)->type->owner); |
0ca743a5 | 1019 | free_percpu(nft_base_chain(chain)->stats); |
96518518 | 1020 | kfree(nft_base_chain(chain)); |
0ca743a5 | 1021 | } else |
96518518 PM |
1022 | kfree(chain); |
1023 | } | |
1024 | ||
1025 | static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb, | |
1026 | const struct nlmsghdr *nlh, | |
1027 | const struct nlattr * const nla[]) | |
1028 | { | |
1029 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1030 | const struct nft_af_info *afi; | |
1031 | struct nft_table *table; | |
1032 | struct nft_chain *chain; | |
99633ab2 | 1033 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1034 | int family = nfmsg->nfgen_family; |
1035 | ||
99633ab2 | 1036 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1037 | if (IS_ERR(afi)) |
1038 | return PTR_ERR(afi); | |
1039 | ||
9370761c | 1040 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
1041 | if (IS_ERR(table)) |
1042 | return PTR_ERR(table); | |
1043 | ||
1044 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
1045 | if (IS_ERR(chain)) | |
1046 | return PTR_ERR(chain); | |
1047 | ||
3dd7279f | 1048 | if (!list_empty(&chain->rules) || chain->use > 0) |
96518518 PM |
1049 | return -EBUSY; |
1050 | ||
1051 | list_del(&chain->list); | |
1052 | table->use--; | |
1053 | ||
9ddf6323 PNA |
1054 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
1055 | chain->flags & NFT_BASE_CHAIN) | |
115a60b1 | 1056 | nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
96518518 PM |
1057 | |
1058 | nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN, | |
1059 | family); | |
1060 | ||
1061 | /* Make sure all rule references are gone before this is released */ | |
1062 | call_rcu(&chain->rcu_head, nf_tables_rcu_chain_destroy); | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | static void nft_ctx_init(struct nft_ctx *ctx, | |
20a69341 PM |
1067 | const struct sk_buff *skb, |
1068 | const struct nlmsghdr *nlh, | |
96518518 PM |
1069 | const struct nft_af_info *afi, |
1070 | const struct nft_table *table, | |
0ca743a5 PNA |
1071 | const struct nft_chain *chain, |
1072 | const struct nlattr * const *nla) | |
96518518 | 1073 | { |
99633ab2 | 1074 | ctx->net = sock_net(skb->sk); |
20a69341 PM |
1075 | ctx->skb = skb; |
1076 | ctx->nlh = nlh; | |
96518518 PM |
1077 | ctx->afi = afi; |
1078 | ctx->table = table; | |
1079 | ctx->chain = chain; | |
0ca743a5 | 1080 | ctx->nla = nla; |
96518518 PM |
1081 | } |
1082 | ||
1083 | /* | |
1084 | * Expressions | |
1085 | */ | |
1086 | ||
1087 | /** | |
ef1f7df9 PM |
1088 | * nft_register_expr - register nf_tables expr type |
1089 | * @ops: expr type | |
96518518 | 1090 | * |
ef1f7df9 | 1091 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1092 | * success or a negative errno code otherwise. |
1093 | */ | |
ef1f7df9 | 1094 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1095 | { |
1096 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
ef1f7df9 | 1097 | list_add_tail(&type->list, &nf_tables_expressions); |
96518518 PM |
1098 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1099 | return 0; | |
1100 | } | |
1101 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1102 | ||
1103 | /** | |
ef1f7df9 PM |
1104 | * nft_unregister_expr - unregister nf_tables expr type |
1105 | * @ops: expr type | |
96518518 | 1106 | * |
ef1f7df9 | 1107 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1108 | */ |
ef1f7df9 | 1109 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1110 | { |
1111 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
ef1f7df9 | 1112 | list_del(&type->list); |
96518518 PM |
1113 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1114 | } | |
1115 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1116 | ||
ef1f7df9 | 1117 | static const struct nft_expr_type *__nft_expr_type_get(struct nlattr *nla) |
96518518 | 1118 | { |
ef1f7df9 | 1119 | const struct nft_expr_type *type; |
96518518 | 1120 | |
ef1f7df9 PM |
1121 | list_for_each_entry(type, &nf_tables_expressions, list) { |
1122 | if (!nla_strcmp(nla, type->name)) | |
1123 | return type; | |
96518518 PM |
1124 | } |
1125 | return NULL; | |
1126 | } | |
1127 | ||
ef1f7df9 | 1128 | static const struct nft_expr_type *nft_expr_type_get(struct nlattr *nla) |
96518518 | 1129 | { |
ef1f7df9 | 1130 | const struct nft_expr_type *type; |
96518518 PM |
1131 | |
1132 | if (nla == NULL) | |
1133 | return ERR_PTR(-EINVAL); | |
1134 | ||
ef1f7df9 PM |
1135 | type = __nft_expr_type_get(nla); |
1136 | if (type != NULL && try_module_get(type->owner)) | |
1137 | return type; | |
96518518 PM |
1138 | |
1139 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1140 | if (type == NULL) { |
96518518 PM |
1141 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1142 | request_module("nft-expr-%.*s", | |
1143 | nla_len(nla), (char *)nla_data(nla)); | |
1144 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
ef1f7df9 | 1145 | if (__nft_expr_type_get(nla)) |
96518518 PM |
1146 | return ERR_PTR(-EAGAIN); |
1147 | } | |
1148 | #endif | |
1149 | return ERR_PTR(-ENOENT); | |
1150 | } | |
1151 | ||
1152 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1153 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1154 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1155 | }; | |
1156 | ||
1157 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1158 | const struct nft_expr *expr) | |
1159 | { | |
ef1f7df9 | 1160 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1161 | goto nla_put_failure; |
1162 | ||
1163 | if (expr->ops->dump) { | |
1164 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1165 | if (data == NULL) | |
1166 | goto nla_put_failure; | |
1167 | if (expr->ops->dump(skb, expr) < 0) | |
1168 | goto nla_put_failure; | |
1169 | nla_nest_end(skb, data); | |
1170 | } | |
1171 | ||
1172 | return skb->len; | |
1173 | ||
1174 | nla_put_failure: | |
1175 | return -1; | |
1176 | }; | |
1177 | ||
1178 | struct nft_expr_info { | |
1179 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1180 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1181 | }; |
1182 | ||
0ca743a5 PNA |
1183 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1184 | const struct nlattr *nla, | |
96518518 PM |
1185 | struct nft_expr_info *info) |
1186 | { | |
ef1f7df9 | 1187 | const struct nft_expr_type *type; |
96518518 | 1188 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1189 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1190 | int err; |
1191 | ||
ef1f7df9 | 1192 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
96518518 PM |
1193 | if (err < 0) |
1194 | return err; | |
1195 | ||
ef1f7df9 PM |
1196 | type = nft_expr_type_get(tb[NFTA_EXPR_NAME]); |
1197 | if (IS_ERR(type)) | |
1198 | return PTR_ERR(type); | |
1199 | ||
1200 | if (tb[NFTA_EXPR_DATA]) { | |
1201 | err = nla_parse_nested(info->tb, type->maxattr, | |
1202 | tb[NFTA_EXPR_DATA], type->policy); | |
1203 | if (err < 0) | |
1204 | goto err1; | |
1205 | } else | |
1206 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1207 | ||
1208 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1209 | ops = type->select_ops(ctx, |
1210 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1211 | if (IS_ERR(ops)) { |
1212 | err = PTR_ERR(ops); | |
1213 | goto err1; | |
1214 | } | |
1215 | } else | |
1216 | ops = type->ops; | |
1217 | ||
96518518 PM |
1218 | info->ops = ops; |
1219 | return 0; | |
ef1f7df9 PM |
1220 | |
1221 | err1: | |
1222 | module_put(type->owner); | |
1223 | return err; | |
96518518 PM |
1224 | } |
1225 | ||
1226 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1227 | const struct nft_expr_info *info, |
96518518 PM |
1228 | struct nft_expr *expr) |
1229 | { | |
1230 | const struct nft_expr_ops *ops = info->ops; | |
1231 | int err; | |
1232 | ||
1233 | expr->ops = ops; | |
1234 | if (ops->init) { | |
ef1f7df9 | 1235 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1236 | if (err < 0) |
1237 | goto err1; | |
1238 | } | |
1239 | ||
96518518 PM |
1240 | return 0; |
1241 | ||
1242 | err1: | |
1243 | expr->ops = NULL; | |
1244 | return err; | |
1245 | } | |
1246 | ||
1247 | static void nf_tables_expr_destroy(struct nft_expr *expr) | |
1248 | { | |
1249 | if (expr->ops->destroy) | |
1250 | expr->ops->destroy(expr); | |
ef1f7df9 | 1251 | module_put(expr->ops->type->owner); |
96518518 PM |
1252 | } |
1253 | ||
1254 | /* | |
1255 | * Rules | |
1256 | */ | |
1257 | ||
1258 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1259 | u64 handle) | |
1260 | { | |
1261 | struct nft_rule *rule; | |
1262 | ||
1263 | // FIXME: this sucks | |
1264 | list_for_each_entry(rule, &chain->rules, list) { | |
1265 | if (handle == rule->handle) | |
1266 | return rule; | |
1267 | } | |
1268 | ||
1269 | return ERR_PTR(-ENOENT); | |
1270 | } | |
1271 | ||
1272 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1273 | const struct nlattr *nla) | |
1274 | { | |
1275 | if (nla == NULL) | |
1276 | return ERR_PTR(-EINVAL); | |
1277 | ||
1278 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1279 | } | |
1280 | ||
1281 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
1282 | [NFTA_RULE_TABLE] = { .type = NLA_STRING }, | |
1283 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, | |
1284 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1285 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1286 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1287 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1288 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
96518518 PM |
1289 | }; |
1290 | ||
1291 | static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq, | |
1292 | int event, u32 flags, int family, | |
1293 | const struct nft_table *table, | |
1294 | const struct nft_chain *chain, | |
1295 | const struct nft_rule *rule) | |
1296 | { | |
1297 | struct nlmsghdr *nlh; | |
1298 | struct nfgenmsg *nfmsg; | |
1299 | const struct nft_expr *expr, *next; | |
1300 | struct nlattr *list; | |
5e948466 EL |
1301 | const struct nft_rule *prule; |
1302 | int type = event | NFNL_SUBSYS_NFTABLES << 8; | |
96518518 | 1303 | |
5e948466 | 1304 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
96518518 PM |
1305 | flags); |
1306 | if (nlh == NULL) | |
1307 | goto nla_put_failure; | |
1308 | ||
1309 | nfmsg = nlmsg_data(nlh); | |
1310 | nfmsg->nfgen_family = family; | |
1311 | nfmsg->version = NFNETLINK_V0; | |
1312 | nfmsg->res_id = 0; | |
1313 | ||
1314 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1315 | goto nla_put_failure; | |
1316 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1317 | goto nla_put_failure; | |
1318 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle))) | |
1319 | goto nla_put_failure; | |
1320 | ||
5e948466 EL |
1321 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
1322 | prule = list_entry(rule->list.prev, struct nft_rule, list); | |
1323 | if (nla_put_be64(skb, NFTA_RULE_POSITION, | |
1324 | cpu_to_be64(prule->handle))) | |
1325 | goto nla_put_failure; | |
1326 | } | |
1327 | ||
96518518 PM |
1328 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
1329 | if (list == NULL) | |
1330 | goto nla_put_failure; | |
1331 | nft_rule_for_each_expr(expr, next, rule) { | |
1332 | struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM); | |
1333 | if (elem == NULL) | |
1334 | goto nla_put_failure; | |
1335 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1336 | goto nla_put_failure; | |
1337 | nla_nest_end(skb, elem); | |
1338 | } | |
1339 | nla_nest_end(skb, list); | |
1340 | ||
1341 | return nlmsg_end(skb, nlh); | |
1342 | ||
1343 | nla_put_failure: | |
1344 | nlmsg_trim(skb, nlh); | |
1345 | return -1; | |
1346 | } | |
1347 | ||
1348 | static int nf_tables_rule_notify(const struct sk_buff *oskb, | |
1349 | const struct nlmsghdr *nlh, | |
1350 | const struct nft_table *table, | |
1351 | const struct nft_chain *chain, | |
1352 | const struct nft_rule *rule, | |
1353 | int event, u32 flags, int family) | |
1354 | { | |
1355 | struct sk_buff *skb; | |
1356 | u32 portid = NETLINK_CB(oskb).portid; | |
1357 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
1358 | u32 seq = nlh->nlmsg_seq; | |
1359 | bool report; | |
1360 | int err; | |
1361 | ||
1362 | report = nlmsg_report(nlh); | |
1363 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
1364 | return 0; | |
1365 | ||
1366 | err = -ENOBUFS; | |
1367 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1368 | if (skb == NULL) | |
1369 | goto err; | |
1370 | ||
1371 | err = nf_tables_fill_rule_info(skb, portid, seq, event, flags, | |
1372 | family, table, chain, rule); | |
1373 | if (err < 0) { | |
1374 | kfree_skb(skb); | |
1375 | goto err; | |
1376 | } | |
1377 | ||
1378 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
1379 | GFP_KERNEL); | |
1380 | err: | |
1381 | if (err < 0) | |
1382 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
1383 | return err; | |
1384 | } | |
1385 | ||
0628b123 PNA |
1386 | static inline bool |
1387 | nft_rule_is_active(struct net *net, const struct nft_rule *rule) | |
1388 | { | |
1389 | return (rule->genmask & (1 << net->nft.gencursor)) == 0; | |
1390 | } | |
1391 | ||
1392 | static inline int gencursor_next(struct net *net) | |
1393 | { | |
1394 | return net->nft.gencursor+1 == 1 ? 1 : 0; | |
1395 | } | |
1396 | ||
1397 | static inline int | |
1398 | nft_rule_is_active_next(struct net *net, const struct nft_rule *rule) | |
1399 | { | |
1400 | return (rule->genmask & (1 << gencursor_next(net))) == 0; | |
1401 | } | |
1402 | ||
1403 | static inline void | |
1404 | nft_rule_activate_next(struct net *net, struct nft_rule *rule) | |
1405 | { | |
1406 | /* Now inactive, will be active in the future */ | |
1407 | rule->genmask = (1 << net->nft.gencursor); | |
1408 | } | |
1409 | ||
1410 | static inline void | |
1411 | nft_rule_disactivate_next(struct net *net, struct nft_rule *rule) | |
1412 | { | |
1413 | rule->genmask = (1 << gencursor_next(net)); | |
1414 | } | |
1415 | ||
1416 | static inline void nft_rule_clear(struct net *net, struct nft_rule *rule) | |
1417 | { | |
1418 | rule->genmask = 0; | |
1419 | } | |
1420 | ||
96518518 PM |
1421 | static int nf_tables_dump_rules(struct sk_buff *skb, |
1422 | struct netlink_callback *cb) | |
1423 | { | |
1424 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1425 | const struct nft_af_info *afi; | |
1426 | const struct nft_table *table; | |
1427 | const struct nft_chain *chain; | |
1428 | const struct nft_rule *rule; | |
1429 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1430 | struct net *net = sock_net(skb->sk); |
96518518 | 1431 | int family = nfmsg->nfgen_family; |
0628b123 PNA |
1432 | u8 genctr = ACCESS_ONCE(net->nft.genctr); |
1433 | u8 gencursor = ACCESS_ONCE(net->nft.gencursor); | |
96518518 | 1434 | |
99633ab2 | 1435 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
1436 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1437 | continue; | |
1438 | ||
1439 | list_for_each_entry(table, &afi->tables, list) { | |
1440 | list_for_each_entry(chain, &table->chains, list) { | |
1441 | list_for_each_entry(rule, &chain->rules, list) { | |
0628b123 PNA |
1442 | if (!nft_rule_is_active(net, rule)) |
1443 | goto cont; | |
96518518 PM |
1444 | if (idx < s_idx) |
1445 | goto cont; | |
1446 | if (idx > s_idx) | |
1447 | memset(&cb->args[1], 0, | |
1448 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1449 | if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid, | |
1450 | cb->nlh->nlmsg_seq, | |
1451 | NFT_MSG_NEWRULE, | |
1452 | NLM_F_MULTI | NLM_F_APPEND, | |
1453 | afi->family, table, chain, rule) < 0) | |
1454 | goto done; | |
1455 | cont: | |
1456 | idx++; | |
1457 | } | |
1458 | } | |
1459 | } | |
1460 | } | |
1461 | done: | |
0628b123 PNA |
1462 | /* Invalidate this dump, a transition to the new generation happened */ |
1463 | if (gencursor != net->nft.gencursor || genctr != net->nft.genctr) | |
1464 | return -EBUSY; | |
1465 | ||
96518518 PM |
1466 | cb->args[0] = idx; |
1467 | return skb->len; | |
1468 | } | |
1469 | ||
1470 | static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb, | |
1471 | const struct nlmsghdr *nlh, | |
1472 | const struct nlattr * const nla[]) | |
1473 | { | |
1474 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1475 | const struct nft_af_info *afi; | |
1476 | const struct nft_table *table; | |
1477 | const struct nft_chain *chain; | |
1478 | const struct nft_rule *rule; | |
1479 | struct sk_buff *skb2; | |
99633ab2 | 1480 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1481 | int family = nfmsg->nfgen_family; |
1482 | int err; | |
1483 | ||
1484 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1485 | struct netlink_dump_control c = { | |
1486 | .dump = nf_tables_dump_rules, | |
1487 | }; | |
1488 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1489 | } | |
1490 | ||
99633ab2 | 1491 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1492 | if (IS_ERR(afi)) |
1493 | return PTR_ERR(afi); | |
1494 | ||
9370761c | 1495 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1496 | if (IS_ERR(table)) |
1497 | return PTR_ERR(table); | |
1498 | ||
1499 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1500 | if (IS_ERR(chain)) | |
1501 | return PTR_ERR(chain); | |
1502 | ||
1503 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
1504 | if (IS_ERR(rule)) | |
1505 | return PTR_ERR(rule); | |
1506 | ||
1507 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1508 | if (!skb2) | |
1509 | return -ENOMEM; | |
1510 | ||
1511 | err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid, | |
1512 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, | |
1513 | family, table, chain, rule); | |
1514 | if (err < 0) | |
1515 | goto err; | |
1516 | ||
1517 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1518 | ||
1519 | err: | |
1520 | kfree_skb(skb2); | |
1521 | return err; | |
1522 | } | |
1523 | ||
1524 | static void nf_tables_rcu_rule_destroy(struct rcu_head *head) | |
1525 | { | |
1526 | struct nft_rule *rule = container_of(head, struct nft_rule, rcu_head); | |
1527 | struct nft_expr *expr; | |
1528 | ||
1529 | /* | |
1530 | * Careful: some expressions might not be initialized in case this | |
1531 | * is called on error from nf_tables_newrule(). | |
1532 | */ | |
1533 | expr = nft_expr_first(rule); | |
1534 | while (expr->ops && expr != nft_expr_last(rule)) { | |
1535 | nf_tables_expr_destroy(expr); | |
1536 | expr = nft_expr_next(expr); | |
1537 | } | |
1538 | kfree(rule); | |
1539 | } | |
1540 | ||
1541 | static void nf_tables_rule_destroy(struct nft_rule *rule) | |
1542 | { | |
1543 | call_rcu(&rule->rcu_head, nf_tables_rcu_rule_destroy); | |
1544 | } | |
1545 | ||
1546 | #define NFT_RULE_MAXEXPRS 128 | |
1547 | ||
1548 | static struct nft_expr_info *info; | |
1549 | ||
0628b123 PNA |
1550 | static struct nft_rule_trans * |
1551 | nf_tables_trans_add(struct nft_rule *rule, const struct nft_ctx *ctx) | |
1552 | { | |
1553 | struct nft_rule_trans *rupd; | |
1554 | ||
1555 | rupd = kmalloc(sizeof(struct nft_rule_trans), GFP_KERNEL); | |
1556 | if (rupd == NULL) | |
1557 | return NULL; | |
1558 | ||
1559 | rupd->chain = ctx->chain; | |
1560 | rupd->table = ctx->table; | |
1561 | rupd->rule = rule; | |
1562 | rupd->family = ctx->afi->family; | |
1563 | rupd->nlh = ctx->nlh; | |
1564 | list_add_tail(&rupd->list, &ctx->net->nft.commit_list); | |
1565 | ||
1566 | return rupd; | |
1567 | } | |
1568 | ||
96518518 PM |
1569 | static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, |
1570 | const struct nlmsghdr *nlh, | |
1571 | const struct nlattr * const nla[]) | |
1572 | { | |
1573 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1574 | const struct nft_af_info *afi; | |
99633ab2 | 1575 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1576 | struct nft_table *table; |
1577 | struct nft_chain *chain; | |
1578 | struct nft_rule *rule, *old_rule = NULL; | |
0628b123 | 1579 | struct nft_rule_trans *repl = NULL; |
96518518 PM |
1580 | struct nft_expr *expr; |
1581 | struct nft_ctx ctx; | |
1582 | struct nlattr *tmp; | |
1583 | unsigned int size, i, n; | |
1584 | int err, rem; | |
1585 | bool create; | |
5e948466 | 1586 | u64 handle, pos_handle; |
96518518 PM |
1587 | |
1588 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1589 | ||
99633ab2 | 1590 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
1591 | if (IS_ERR(afi)) |
1592 | return PTR_ERR(afi); | |
1593 | ||
9370761c | 1594 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1595 | if (IS_ERR(table)) |
1596 | return PTR_ERR(table); | |
1597 | ||
1598 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1599 | if (IS_ERR(chain)) | |
1600 | return PTR_ERR(chain); | |
1601 | ||
1602 | if (nla[NFTA_RULE_HANDLE]) { | |
1603 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
1604 | rule = __nf_tables_rule_lookup(chain, handle); | |
1605 | if (IS_ERR(rule)) | |
1606 | return PTR_ERR(rule); | |
1607 | ||
1608 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1609 | return -EEXIST; | |
1610 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1611 | old_rule = rule; | |
1612 | else | |
1613 | return -EOPNOTSUPP; | |
1614 | } else { | |
1615 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
1616 | return -EINVAL; | |
1617 | handle = nf_tables_alloc_handle(table); | |
1618 | } | |
1619 | ||
5e948466 EL |
1620 | if (nla[NFTA_RULE_POSITION]) { |
1621 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
1622 | return -EOPNOTSUPP; | |
1623 | ||
1624 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
1625 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
1626 | if (IS_ERR(old_rule)) | |
1627 | return PTR_ERR(old_rule); | |
1628 | } | |
1629 | ||
0ca743a5 PNA |
1630 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1631 | ||
96518518 PM |
1632 | n = 0; |
1633 | size = 0; | |
1634 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
1635 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
1636 | err = -EINVAL; | |
1637 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
1638 | goto err1; | |
1639 | if (n == NFT_RULE_MAXEXPRS) | |
1640 | goto err1; | |
0ca743a5 | 1641 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
1642 | if (err < 0) |
1643 | goto err1; | |
1644 | size += info[n].ops->size; | |
1645 | n++; | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | err = -ENOMEM; | |
1650 | rule = kzalloc(sizeof(*rule) + size, GFP_KERNEL); | |
1651 | if (rule == NULL) | |
1652 | goto err1; | |
1653 | ||
0628b123 PNA |
1654 | nft_rule_activate_next(net, rule); |
1655 | ||
96518518 PM |
1656 | rule->handle = handle; |
1657 | rule->dlen = size; | |
1658 | ||
96518518 PM |
1659 | expr = nft_expr_first(rule); |
1660 | for (i = 0; i < n; i++) { | |
1661 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
1662 | if (err < 0) | |
1663 | goto err2; | |
ef1f7df9 | 1664 | info[i].ops = NULL; |
96518518 PM |
1665 | expr = nft_expr_next(expr); |
1666 | } | |
1667 | ||
96518518 | 1668 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
0628b123 PNA |
1669 | if (nft_rule_is_active_next(net, old_rule)) { |
1670 | repl = nf_tables_trans_add(old_rule, &ctx); | |
1671 | if (repl == NULL) { | |
1672 | err = -ENOMEM; | |
1673 | goto err2; | |
1674 | } | |
1675 | nft_rule_disactivate_next(net, old_rule); | |
1676 | list_add_tail(&rule->list, &old_rule->list); | |
1677 | } else { | |
1678 | err = -ENOENT; | |
1679 | goto err2; | |
1680 | } | |
96518518 | 1681 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
1682 | if (old_rule) |
1683 | list_add_rcu(&rule->list, &old_rule->list); | |
1684 | else | |
1685 | list_add_tail_rcu(&rule->list, &chain->rules); | |
1686 | else { | |
1687 | if (old_rule) | |
1688 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
1689 | else | |
1690 | list_add_rcu(&rule->list, &chain->rules); | |
1691 | } | |
96518518 | 1692 | |
0628b123 PNA |
1693 | if (nf_tables_trans_add(rule, &ctx) == NULL) { |
1694 | err = -ENOMEM; | |
1695 | goto err3; | |
1696 | } | |
96518518 PM |
1697 | return 0; |
1698 | ||
0628b123 PNA |
1699 | err3: |
1700 | list_del_rcu(&rule->list); | |
1701 | if (repl) { | |
1702 | list_del_rcu(&repl->rule->list); | |
1703 | list_del(&repl->list); | |
1704 | nft_rule_clear(net, repl->rule); | |
1705 | kfree(repl); | |
1706 | } | |
96518518 PM |
1707 | err2: |
1708 | nf_tables_rule_destroy(rule); | |
1709 | err1: | |
1710 | for (i = 0; i < n; i++) { | |
1711 | if (info[i].ops != NULL) | |
ef1f7df9 | 1712 | module_put(info[i].ops->type->owner); |
96518518 PM |
1713 | } |
1714 | return err; | |
1715 | } | |
1716 | ||
0628b123 PNA |
1717 | static int |
1718 | nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule) | |
1719 | { | |
1720 | /* You cannot delete the same rule twice */ | |
1721 | if (nft_rule_is_active_next(ctx->net, rule)) { | |
1722 | if (nf_tables_trans_add(rule, ctx) == NULL) | |
1723 | return -ENOMEM; | |
1724 | nft_rule_disactivate_next(ctx->net, rule); | |
1725 | return 0; | |
1726 | } | |
1727 | return -ENOENT; | |
1728 | } | |
1729 | ||
cf9dc09d PNA |
1730 | static int nf_table_delrule_by_chain(struct nft_ctx *ctx) |
1731 | { | |
1732 | struct nft_rule *rule; | |
1733 | int err; | |
1734 | ||
1735 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
1736 | err = nf_tables_delrule_one(ctx, rule); | |
1737 | if (err < 0) | |
1738 | return err; | |
1739 | } | |
1740 | return 0; | |
1741 | } | |
1742 | ||
96518518 PM |
1743 | static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb, |
1744 | const struct nlmsghdr *nlh, | |
1745 | const struct nlattr * const nla[]) | |
1746 | { | |
1747 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1748 | const struct nft_af_info *afi; | |
99633ab2 | 1749 | struct net *net = sock_net(skb->sk); |
96518518 | 1750 | const struct nft_table *table; |
cf9dc09d PNA |
1751 | struct nft_chain *chain = NULL; |
1752 | struct nft_rule *rule; | |
0628b123 PNA |
1753 | int family = nfmsg->nfgen_family, err = 0; |
1754 | struct nft_ctx ctx; | |
96518518 | 1755 | |
99633ab2 | 1756 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1757 | if (IS_ERR(afi)) |
1758 | return PTR_ERR(afi); | |
1759 | ||
9370761c | 1760 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1761 | if (IS_ERR(table)) |
1762 | return PTR_ERR(table); | |
1763 | ||
cf9dc09d PNA |
1764 | if (nla[NFTA_RULE_CHAIN]) { |
1765 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1766 | if (IS_ERR(chain)) | |
1767 | return PTR_ERR(chain); | |
1768 | } | |
96518518 | 1769 | |
0628b123 PNA |
1770 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1771 | ||
cf9dc09d PNA |
1772 | if (chain) { |
1773 | if (nla[NFTA_RULE_HANDLE]) { | |
1774 | rule = nf_tables_rule_lookup(chain, | |
1775 | nla[NFTA_RULE_HANDLE]); | |
1776 | if (IS_ERR(rule)) | |
1777 | return PTR_ERR(rule); | |
96518518 | 1778 | |
0628b123 | 1779 | err = nf_tables_delrule_one(&ctx, rule); |
cf9dc09d PNA |
1780 | } else { |
1781 | err = nf_table_delrule_by_chain(&ctx); | |
1782 | } | |
1783 | } else { | |
1784 | list_for_each_entry(chain, &table->chains, list) { | |
1785 | ctx.chain = chain; | |
1786 | err = nf_table_delrule_by_chain(&ctx); | |
0628b123 PNA |
1787 | if (err < 0) |
1788 | break; | |
1789 | } | |
1790 | } | |
1791 | ||
1792 | return err; | |
1793 | } | |
1794 | ||
1795 | static int nf_tables_commit(struct sk_buff *skb) | |
1796 | { | |
1797 | struct net *net = sock_net(skb->sk); | |
1798 | struct nft_rule_trans *rupd, *tmp; | |
96518518 | 1799 | |
0628b123 PNA |
1800 | /* Bump generation counter, invalidate any dump in progress */ |
1801 | net->nft.genctr++; | |
1802 | ||
1803 | /* A new generation has just started */ | |
1804 | net->nft.gencursor = gencursor_next(net); | |
1805 | ||
1806 | /* Make sure all packets have left the previous generation before | |
1807 | * purging old rules. | |
1808 | */ | |
1809 | synchronize_rcu(); | |
1810 | ||
1811 | list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { | |
1812 | /* Delete this rule from the dirty list */ | |
1813 | list_del(&rupd->list); | |
1814 | ||
1815 | /* This rule was inactive in the past and just became active. | |
1816 | * Clear the next bit of the genmask since its meaning has | |
1817 | * changed, now it is the future. | |
1818 | */ | |
1819 | if (nft_rule_is_active(net, rupd->rule)) { | |
1820 | nft_rule_clear(net, rupd->rule); | |
1821 | nf_tables_rule_notify(skb, rupd->nlh, rupd->table, | |
1822 | rupd->chain, rupd->rule, | |
1823 | NFT_MSG_NEWRULE, 0, | |
1824 | rupd->family); | |
1825 | kfree(rupd); | |
1826 | continue; | |
96518518 | 1827 | } |
0628b123 PNA |
1828 | |
1829 | /* This rule is in the past, get rid of it */ | |
1830 | list_del_rcu(&rupd->rule->list); | |
1831 | nf_tables_rule_notify(skb, rupd->nlh, rupd->table, rupd->chain, | |
1832 | rupd->rule, NFT_MSG_DELRULE, 0, | |
1833 | rupd->family); | |
1834 | nf_tables_rule_destroy(rupd->rule); | |
1835 | kfree(rupd); | |
96518518 PM |
1836 | } |
1837 | ||
96518518 PM |
1838 | return 0; |
1839 | } | |
1840 | ||
0628b123 PNA |
1841 | static int nf_tables_abort(struct sk_buff *skb) |
1842 | { | |
1843 | struct net *net = sock_net(skb->sk); | |
1844 | struct nft_rule_trans *rupd, *tmp; | |
1845 | ||
1846 | list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { | |
1847 | /* Delete all rules from the dirty list */ | |
1848 | list_del(&rupd->list); | |
1849 | ||
1850 | if (!nft_rule_is_active_next(net, rupd->rule)) { | |
1851 | nft_rule_clear(net, rupd->rule); | |
1852 | kfree(rupd); | |
1853 | continue; | |
1854 | } | |
1855 | ||
1856 | /* This rule is inactive, get rid of it */ | |
1857 | list_del_rcu(&rupd->rule->list); | |
1858 | nf_tables_rule_destroy(rupd->rule); | |
1859 | kfree(rupd); | |
1860 | } | |
1861 | return 0; | |
1862 | } | |
1863 | ||
20a69341 PM |
1864 | /* |
1865 | * Sets | |
1866 | */ | |
1867 | ||
1868 | static LIST_HEAD(nf_tables_set_ops); | |
1869 | ||
1870 | int nft_register_set(struct nft_set_ops *ops) | |
1871 | { | |
1872 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1873 | list_add_tail(&ops->list, &nf_tables_set_ops); | |
1874 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1875 | return 0; | |
1876 | } | |
1877 | EXPORT_SYMBOL_GPL(nft_register_set); | |
1878 | ||
1879 | void nft_unregister_set(struct nft_set_ops *ops) | |
1880 | { | |
1881 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1882 | list_del(&ops->list); | |
1883 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1884 | } | |
1885 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
1886 | ||
1887 | static const struct nft_set_ops *nft_select_set_ops(const struct nlattr * const nla[]) | |
1888 | { | |
1889 | const struct nft_set_ops *ops; | |
1890 | u32 features; | |
1891 | ||
1892 | #ifdef CONFIG_MODULES | |
1893 | if (list_empty(&nf_tables_set_ops)) { | |
1894 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1895 | request_module("nft-set"); | |
1896 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1897 | if (!list_empty(&nf_tables_set_ops)) | |
1898 | return ERR_PTR(-EAGAIN); | |
1899 | } | |
1900 | #endif | |
1901 | features = 0; | |
1902 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
1903 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
1904 | features &= NFT_SET_INTERVAL | NFT_SET_MAP; | |
1905 | } | |
1906 | ||
1907 | // FIXME: implement selection properly | |
1908 | list_for_each_entry(ops, &nf_tables_set_ops, list) { | |
1909 | if ((ops->features & features) != features) | |
1910 | continue; | |
1911 | if (!try_module_get(ops->owner)) | |
1912 | continue; | |
1913 | return ops; | |
1914 | } | |
1915 | ||
1916 | return ERR_PTR(-EOPNOTSUPP); | |
1917 | } | |
1918 | ||
1919 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
1920 | [NFTA_SET_TABLE] = { .type = NLA_STRING }, | |
1921 | [NFTA_SET_NAME] = { .type = NLA_STRING }, | |
1922 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, | |
1923 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
1924 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
1925 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
1926 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
1927 | }; | |
1928 | ||
1929 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, | |
1930 | const struct sk_buff *skb, | |
1931 | const struct nlmsghdr *nlh, | |
1932 | const struct nlattr * const nla[]) | |
1933 | { | |
99633ab2 | 1934 | struct net *net = sock_net(skb->sk); |
20a69341 | 1935 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
c9c8e485 | 1936 | const struct nft_af_info *afi = NULL; |
20a69341 PM |
1937 | const struct nft_table *table = NULL; |
1938 | ||
c9c8e485 PNA |
1939 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
1940 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
1941 | if (IS_ERR(afi)) | |
1942 | return PTR_ERR(afi); | |
1943 | } | |
20a69341 PM |
1944 | |
1945 | if (nla[NFTA_SET_TABLE] != NULL) { | |
9370761c | 1946 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
1947 | if (IS_ERR(table)) |
1948 | return PTR_ERR(table); | |
1949 | } | |
1950 | ||
0ca743a5 | 1951 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
1952 | return 0; |
1953 | } | |
1954 | ||
1955 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, | |
1956 | const struct nlattr *nla) | |
1957 | { | |
1958 | struct nft_set *set; | |
1959 | ||
1960 | if (nla == NULL) | |
1961 | return ERR_PTR(-EINVAL); | |
1962 | ||
1963 | list_for_each_entry(set, &table->sets, list) { | |
1964 | if (!nla_strcmp(nla, set->name)) | |
1965 | return set; | |
1966 | } | |
1967 | return ERR_PTR(-ENOENT); | |
1968 | } | |
1969 | ||
1970 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, | |
1971 | const char *name) | |
1972 | { | |
1973 | const struct nft_set *i; | |
1974 | const char *p; | |
1975 | unsigned long *inuse; | |
1976 | unsigned int n = 0; | |
1977 | ||
1978 | p = strnchr(name, IFNAMSIZ, '%'); | |
1979 | if (p != NULL) { | |
1980 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
1981 | return -EINVAL; | |
1982 | ||
1983 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
1984 | if (inuse == NULL) | |
1985 | return -ENOMEM; | |
1986 | ||
1987 | list_for_each_entry(i, &ctx->table->sets, list) { | |
14662917 DB |
1988 | int tmp; |
1989 | ||
1990 | if (!sscanf(i->name, name, &tmp)) | |
20a69341 | 1991 | continue; |
14662917 | 1992 | if (tmp < 0 || tmp > BITS_PER_LONG * PAGE_SIZE) |
20a69341 | 1993 | continue; |
14662917 DB |
1994 | |
1995 | set_bit(tmp, inuse); | |
20a69341 PM |
1996 | } |
1997 | ||
1998 | n = find_first_zero_bit(inuse, BITS_PER_LONG * PAGE_SIZE); | |
1999 | free_page((unsigned long)inuse); | |
2000 | } | |
2001 | ||
2002 | snprintf(set->name, sizeof(set->name), name, n); | |
2003 | list_for_each_entry(i, &ctx->table->sets, list) { | |
2004 | if (!strcmp(set->name, i->name)) | |
2005 | return -ENFILE; | |
2006 | } | |
2007 | return 0; | |
2008 | } | |
2009 | ||
2010 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2011 | const struct nft_set *set, u16 event, u16 flags) | |
2012 | { | |
2013 | struct nfgenmsg *nfmsg; | |
2014 | struct nlmsghdr *nlh; | |
2015 | u32 portid = NETLINK_CB(ctx->skb).portid; | |
2016 | u32 seq = ctx->nlh->nlmsg_seq; | |
2017 | ||
2018 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2019 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2020 | flags); | |
2021 | if (nlh == NULL) | |
2022 | goto nla_put_failure; | |
2023 | ||
2024 | nfmsg = nlmsg_data(nlh); | |
2025 | nfmsg->nfgen_family = ctx->afi->family; | |
2026 | nfmsg->version = NFNETLINK_V0; | |
2027 | nfmsg->res_id = 0; | |
2028 | ||
2029 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2030 | goto nla_put_failure; | |
2031 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2032 | goto nla_put_failure; | |
2033 | if (set->flags != 0) | |
2034 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2035 | goto nla_put_failure; | |
2036 | ||
2037 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2038 | goto nla_put_failure; | |
2039 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2040 | goto nla_put_failure; | |
2041 | if (set->flags & NFT_SET_MAP) { | |
2042 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2043 | goto nla_put_failure; | |
2044 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2045 | goto nla_put_failure; | |
2046 | } | |
2047 | ||
2048 | return nlmsg_end(skb, nlh); | |
2049 | ||
2050 | nla_put_failure: | |
2051 | nlmsg_trim(skb, nlh); | |
2052 | return -1; | |
2053 | } | |
2054 | ||
2055 | static int nf_tables_set_notify(const struct nft_ctx *ctx, | |
2056 | const struct nft_set *set, | |
2057 | int event) | |
2058 | { | |
2059 | struct sk_buff *skb; | |
2060 | u32 portid = NETLINK_CB(ctx->skb).portid; | |
20a69341 PM |
2061 | bool report; |
2062 | int err; | |
2063 | ||
2064 | report = nlmsg_report(ctx->nlh); | |
99633ab2 | 2065 | if (!report && !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
20a69341 PM |
2066 | return 0; |
2067 | ||
2068 | err = -ENOBUFS; | |
2069 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2070 | if (skb == NULL) | |
2071 | goto err; | |
2072 | ||
2073 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2074 | if (err < 0) { | |
2075 | kfree_skb(skb); | |
2076 | goto err; | |
2077 | } | |
2078 | ||
99633ab2 | 2079 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, report, |
20a69341 PM |
2080 | GFP_KERNEL); |
2081 | err: | |
2082 | if (err < 0) | |
99633ab2 | 2083 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
20a69341 PM |
2084 | return err; |
2085 | } | |
2086 | ||
2087 | static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb, | |
2088 | struct netlink_callback *cb) | |
2089 | { | |
2090 | const struct nft_set *set; | |
2091 | unsigned int idx = 0, s_idx = cb->args[0]; | |
2092 | ||
2093 | if (cb->args[1]) | |
2094 | return skb->len; | |
2095 | ||
2096 | list_for_each_entry(set, &ctx->table->sets, list) { | |
2097 | if (idx < s_idx) | |
2098 | goto cont; | |
2099 | if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, | |
2100 | NLM_F_MULTI) < 0) { | |
2101 | cb->args[0] = idx; | |
2102 | goto done; | |
2103 | } | |
2104 | cont: | |
2105 | idx++; | |
2106 | } | |
2107 | cb->args[1] = 1; | |
2108 | done: | |
2109 | return skb->len; | |
2110 | } | |
2111 | ||
c9c8e485 PNA |
2112 | static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb, |
2113 | struct netlink_callback *cb) | |
20a69341 PM |
2114 | { |
2115 | const struct nft_set *set; | |
e38195bf | 2116 | unsigned int idx, s_idx = cb->args[0]; |
20a69341 PM |
2117 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2118 | ||
2119 | if (cb->args[1]) | |
2120 | return skb->len; | |
2121 | ||
2122 | list_for_each_entry(table, &ctx->afi->tables, list) { | |
e38195bf PNA |
2123 | if (cur_table) { |
2124 | if (cur_table != table) | |
2125 | continue; | |
20a69341 | 2126 | |
e38195bf PNA |
2127 | cur_table = NULL; |
2128 | } | |
20a69341 | 2129 | ctx->table = table; |
e38195bf | 2130 | idx = 0; |
20a69341 PM |
2131 | list_for_each_entry(set, &ctx->table->sets, list) { |
2132 | if (idx < s_idx) | |
2133 | goto cont; | |
2134 | if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, | |
2135 | NLM_F_MULTI) < 0) { | |
2136 | cb->args[0] = idx; | |
2137 | cb->args[2] = (unsigned long) table; | |
2138 | goto done; | |
2139 | } | |
2140 | cont: | |
2141 | idx++; | |
2142 | } | |
2143 | } | |
2144 | cb->args[1] = 1; | |
2145 | done: | |
2146 | return skb->len; | |
2147 | } | |
2148 | ||
c9c8e485 PNA |
2149 | static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb, |
2150 | struct netlink_callback *cb) | |
2151 | { | |
2152 | const struct nft_set *set; | |
2153 | unsigned int idx, s_idx = cb->args[0]; | |
2154 | const struct nft_af_info *afi; | |
2155 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; | |
2156 | struct net *net = sock_net(skb->sk); | |
2157 | int cur_family = cb->args[3]; | |
2158 | ||
2159 | if (cb->args[1]) | |
2160 | return skb->len; | |
2161 | ||
2162 | list_for_each_entry(afi, &net->nft.af_info, list) { | |
2163 | if (cur_family) { | |
2164 | if (afi->family != cur_family) | |
2165 | continue; | |
2166 | ||
2167 | cur_family = 0; | |
2168 | } | |
2169 | ||
2170 | list_for_each_entry(table, &afi->tables, list) { | |
2171 | if (cur_table) { | |
2172 | if (cur_table != table) | |
2173 | continue; | |
2174 | ||
2175 | cur_table = NULL; | |
2176 | } | |
2177 | ||
2178 | ctx->table = table; | |
2179 | ctx->afi = afi; | |
2180 | idx = 0; | |
2181 | list_for_each_entry(set, &ctx->table->sets, list) { | |
2182 | if (idx < s_idx) | |
2183 | goto cont; | |
2184 | if (nf_tables_fill_set(skb, ctx, set, | |
2185 | NFT_MSG_NEWSET, | |
2186 | NLM_F_MULTI) < 0) { | |
2187 | cb->args[0] = idx; | |
2188 | cb->args[2] = (unsigned long) table; | |
2189 | cb->args[3] = afi->family; | |
2190 | goto done; | |
2191 | } | |
2192 | cont: | |
2193 | idx++; | |
2194 | } | |
2195 | if (s_idx) | |
2196 | s_idx = 0; | |
2197 | } | |
2198 | } | |
2199 | cb->args[1] = 1; | |
2200 | done: | |
2201 | return skb->len; | |
2202 | } | |
2203 | ||
20a69341 PM |
2204 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
2205 | { | |
2206 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
2207 | struct nlattr *nla[NFTA_SET_MAX + 1]; | |
2208 | struct nft_ctx ctx; | |
2209 | int err, ret; | |
2210 | ||
2211 | err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX, | |
2212 | nft_set_policy); | |
2213 | if (err < 0) | |
2214 | return err; | |
2215 | ||
2216 | err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla); | |
2217 | if (err < 0) | |
2218 | return err; | |
2219 | ||
c9c8e485 PNA |
2220 | if (ctx.table == NULL) { |
2221 | if (ctx.afi == NULL) | |
2222 | ret = nf_tables_dump_sets_all(&ctx, skb, cb); | |
2223 | else | |
2224 | ret = nf_tables_dump_sets_family(&ctx, skb, cb); | |
2225 | } else | |
20a69341 PM |
2226 | ret = nf_tables_dump_sets_table(&ctx, skb, cb); |
2227 | ||
2228 | return ret; | |
2229 | } | |
2230 | ||
2231 | static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb, | |
2232 | const struct nlmsghdr *nlh, | |
2233 | const struct nlattr * const nla[]) | |
2234 | { | |
2235 | const struct nft_set *set; | |
2236 | struct nft_ctx ctx; | |
2237 | struct sk_buff *skb2; | |
c9c8e485 | 2238 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2239 | int err; |
2240 | ||
2241 | /* Verify existance before starting dump */ | |
2242 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); | |
2243 | if (err < 0) | |
2244 | return err; | |
2245 | ||
2246 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2247 | struct netlink_dump_control c = { | |
2248 | .dump = nf_tables_dump_sets, | |
2249 | }; | |
2250 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
2251 | } | |
2252 | ||
c9c8e485 PNA |
2253 | /* Only accept unspec with dump */ |
2254 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2255 | return -EAFNOSUPPORT; | |
2256 | ||
20a69341 PM |
2257 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
2258 | if (IS_ERR(set)) | |
2259 | return PTR_ERR(set); | |
2260 | ||
2261 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2262 | if (skb2 == NULL) | |
2263 | return -ENOMEM; | |
2264 | ||
2265 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2266 | if (err < 0) | |
2267 | goto err; | |
2268 | ||
2269 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2270 | ||
2271 | err: | |
2272 | kfree_skb(skb2); | |
2273 | return err; | |
2274 | } | |
2275 | ||
2276 | static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb, | |
2277 | const struct nlmsghdr *nlh, | |
2278 | const struct nlattr * const nla[]) | |
2279 | { | |
2280 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
2281 | const struct nft_set_ops *ops; | |
2282 | const struct nft_af_info *afi; | |
99633ab2 | 2283 | struct net *net = sock_net(skb->sk); |
20a69341 PM |
2284 | struct nft_table *table; |
2285 | struct nft_set *set; | |
2286 | struct nft_ctx ctx; | |
2287 | char name[IFNAMSIZ]; | |
2288 | unsigned int size; | |
2289 | bool create; | |
2290 | u32 ktype, klen, dlen, dtype, flags; | |
2291 | int err; | |
2292 | ||
2293 | if (nla[NFTA_SET_TABLE] == NULL || | |
2294 | nla[NFTA_SET_NAME] == NULL || | |
2295 | nla[NFTA_SET_KEY_LEN] == NULL) | |
2296 | return -EINVAL; | |
2297 | ||
2298 | ktype = NFT_DATA_VALUE; | |
2299 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
2300 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
2301 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
2302 | return -EINVAL; | |
2303 | } | |
2304 | ||
2305 | klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); | |
2306 | if (klen == 0 || klen > FIELD_SIZEOF(struct nft_data, data)) | |
2307 | return -EINVAL; | |
2308 | ||
2309 | flags = 0; | |
2310 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2311 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
2312 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
2313 | NFT_SET_INTERVAL | NFT_SET_MAP)) | |
2314 | return -EINVAL; | |
2315 | } | |
2316 | ||
2317 | dtype = 0; | |
2318 | dlen = 0; | |
2319 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { | |
2320 | if (!(flags & NFT_SET_MAP)) | |
2321 | return -EINVAL; | |
2322 | ||
2323 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
2324 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
2325 | dtype != NFT_DATA_VERDICT) | |
2326 | return -EINVAL; | |
2327 | ||
2328 | if (dtype != NFT_DATA_VERDICT) { | |
2329 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
2330 | return -EINVAL; | |
2331 | dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); | |
2332 | if (dlen == 0 || | |
2333 | dlen > FIELD_SIZEOF(struct nft_data, data)) | |
2334 | return -EINVAL; | |
2335 | } else | |
2336 | dlen = sizeof(struct nft_data); | |
2337 | } else if (flags & NFT_SET_MAP) | |
2338 | return -EINVAL; | |
2339 | ||
2340 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
2341 | ||
99633ab2 | 2342 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
2343 | if (IS_ERR(afi)) |
2344 | return PTR_ERR(afi); | |
2345 | ||
9370761c | 2346 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
2347 | if (IS_ERR(table)) |
2348 | return PTR_ERR(table); | |
2349 | ||
0ca743a5 | 2350 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2351 | |
2352 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); | |
2353 | if (IS_ERR(set)) { | |
2354 | if (PTR_ERR(set) != -ENOENT) | |
2355 | return PTR_ERR(set); | |
2356 | set = NULL; | |
2357 | } | |
2358 | ||
2359 | if (set != NULL) { | |
2360 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2361 | return -EEXIST; | |
2362 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2363 | return -EOPNOTSUPP; | |
2364 | return 0; | |
2365 | } | |
2366 | ||
2367 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2368 | return -ENOENT; | |
2369 | ||
2370 | ops = nft_select_set_ops(nla); | |
2371 | if (IS_ERR(ops)) | |
2372 | return PTR_ERR(ops); | |
2373 | ||
2374 | size = 0; | |
2375 | if (ops->privsize != NULL) | |
2376 | size = ops->privsize(nla); | |
2377 | ||
2378 | err = -ENOMEM; | |
2379 | set = kzalloc(sizeof(*set) + size, GFP_KERNEL); | |
2380 | if (set == NULL) | |
2381 | goto err1; | |
2382 | ||
2383 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); | |
2384 | err = nf_tables_set_alloc_name(&ctx, set, name); | |
2385 | if (err < 0) | |
2386 | goto err2; | |
2387 | ||
2388 | INIT_LIST_HEAD(&set->bindings); | |
2389 | set->ops = ops; | |
2390 | set->ktype = ktype; | |
2391 | set->klen = klen; | |
2392 | set->dtype = dtype; | |
2393 | set->dlen = dlen; | |
2394 | set->flags = flags; | |
2395 | ||
2396 | err = ops->init(set, nla); | |
2397 | if (err < 0) | |
2398 | goto err2; | |
2399 | ||
2400 | list_add_tail(&set->list, &table->sets); | |
2401 | nf_tables_set_notify(&ctx, set, NFT_MSG_NEWSET); | |
2402 | return 0; | |
2403 | ||
2404 | err2: | |
2405 | kfree(set); | |
2406 | err1: | |
2407 | module_put(ops->owner); | |
2408 | return err; | |
2409 | } | |
2410 | ||
2411 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) | |
2412 | { | |
2413 | list_del(&set->list); | |
2414 | if (!(set->flags & NFT_SET_ANONYMOUS)) | |
2415 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET); | |
2416 | ||
2417 | set->ops->destroy(set); | |
2418 | module_put(set->ops->owner); | |
2419 | kfree(set); | |
2420 | } | |
2421 | ||
2422 | static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb, | |
2423 | const struct nlmsghdr *nlh, | |
2424 | const struct nlattr * const nla[]) | |
2425 | { | |
c9c8e485 | 2426 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2427 | struct nft_set *set; |
2428 | struct nft_ctx ctx; | |
2429 | int err; | |
2430 | ||
2431 | if (nla[NFTA_SET_TABLE] == NULL) | |
2432 | return -EINVAL; | |
2433 | ||
2434 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); | |
2435 | if (err < 0) | |
2436 | return err; | |
2437 | ||
c9c8e485 PNA |
2438 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
2439 | return -EAFNOSUPPORT; | |
2440 | ||
20a69341 PM |
2441 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
2442 | if (IS_ERR(set)) | |
2443 | return PTR_ERR(set); | |
2444 | if (!list_empty(&set->bindings)) | |
2445 | return -EBUSY; | |
2446 | ||
2447 | nf_tables_set_destroy(&ctx, set); | |
2448 | return 0; | |
2449 | } | |
2450 | ||
2451 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
2452 | const struct nft_set *set, | |
2453 | const struct nft_set_iter *iter, | |
2454 | const struct nft_set_elem *elem) | |
2455 | { | |
2456 | enum nft_registers dreg; | |
2457 | ||
2458 | dreg = nft_type_to_reg(set->dtype); | |
2ee0d3c8 PNA |
2459 | return nft_validate_data_load(ctx, dreg, &elem->data, |
2460 | set->dtype == NFT_DATA_VERDICT ? | |
2461 | NFT_DATA_VERDICT : NFT_DATA_VALUE); | |
20a69341 PM |
2462 | } |
2463 | ||
2464 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2465 | struct nft_set_binding *binding) | |
2466 | { | |
2467 | struct nft_set_binding *i; | |
2468 | struct nft_set_iter iter; | |
2469 | ||
2470 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
2471 | return -EBUSY; | |
2472 | ||
2473 | if (set->flags & NFT_SET_MAP) { | |
2474 | /* If the set is already bound to the same chain all | |
2475 | * jumps are already validated for that chain. | |
2476 | */ | |
2477 | list_for_each_entry(i, &set->bindings, list) { | |
2478 | if (i->chain == binding->chain) | |
2479 | goto bind; | |
2480 | } | |
2481 | ||
2482 | iter.skip = 0; | |
2483 | iter.count = 0; | |
2484 | iter.err = 0; | |
2485 | iter.fn = nf_tables_bind_check_setelem; | |
2486 | ||
2487 | set->ops->walk(ctx, set, &iter); | |
2488 | if (iter.err < 0) { | |
2489 | /* Destroy anonymous sets if binding fails */ | |
2490 | if (set->flags & NFT_SET_ANONYMOUS) | |
2491 | nf_tables_set_destroy(ctx, set); | |
2492 | ||
2493 | return iter.err; | |
2494 | } | |
2495 | } | |
2496 | bind: | |
2497 | binding->chain = ctx->chain; | |
2498 | list_add_tail(&binding->list, &set->bindings); | |
2499 | return 0; | |
2500 | } | |
2501 | ||
2502 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2503 | struct nft_set_binding *binding) | |
2504 | { | |
2505 | list_del(&binding->list); | |
2506 | ||
2507 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
2508 | nf_tables_set_destroy(ctx, set); | |
2509 | } | |
2510 | ||
2511 | /* | |
2512 | * Set elements | |
2513 | */ | |
2514 | ||
2515 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
2516 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
2517 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
2518 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
2519 | }; | |
2520 | ||
2521 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
2522 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING }, | |
2523 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING }, | |
2524 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, | |
2525 | }; | |
2526 | ||
2527 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, | |
2528 | const struct sk_buff *skb, | |
2529 | const struct nlmsghdr *nlh, | |
2530 | const struct nlattr * const nla[]) | |
2531 | { | |
2532 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
2533 | const struct nft_af_info *afi; | |
2534 | const struct nft_table *table; | |
99633ab2 | 2535 | struct net *net = sock_net(skb->sk); |
20a69341 | 2536 | |
99633ab2 | 2537 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
2538 | if (IS_ERR(afi)) |
2539 | return PTR_ERR(afi); | |
2540 | ||
9370761c | 2541 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]); |
20a69341 PM |
2542 | if (IS_ERR(table)) |
2543 | return PTR_ERR(table); | |
2544 | ||
0ca743a5 | 2545 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2546 | return 0; |
2547 | } | |
2548 | ||
2549 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
2550 | const struct nft_set *set, | |
2551 | const struct nft_set_elem *elem) | |
2552 | { | |
2553 | unsigned char *b = skb_tail_pointer(skb); | |
2554 | struct nlattr *nest; | |
2555 | ||
2556 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
2557 | if (nest == NULL) | |
2558 | goto nla_put_failure; | |
2559 | ||
2560 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE, | |
2561 | set->klen) < 0) | |
2562 | goto nla_put_failure; | |
2563 | ||
2564 | if (set->flags & NFT_SET_MAP && | |
2565 | !(elem->flags & NFT_SET_ELEM_INTERVAL_END) && | |
2566 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data, | |
2567 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
2568 | set->dlen) < 0) | |
2569 | goto nla_put_failure; | |
2570 | ||
2571 | if (elem->flags != 0) | |
2572 | if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags))) | |
2573 | goto nla_put_failure; | |
2574 | ||
2575 | nla_nest_end(skb, nest); | |
2576 | return 0; | |
2577 | ||
2578 | nla_put_failure: | |
2579 | nlmsg_trim(skb, b); | |
2580 | return -EMSGSIZE; | |
2581 | } | |
2582 | ||
2583 | struct nft_set_dump_args { | |
2584 | const struct netlink_callback *cb; | |
2585 | struct nft_set_iter iter; | |
2586 | struct sk_buff *skb; | |
2587 | }; | |
2588 | ||
2589 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
2590 | const struct nft_set *set, | |
2591 | const struct nft_set_iter *iter, | |
2592 | const struct nft_set_elem *elem) | |
2593 | { | |
2594 | struct nft_set_dump_args *args; | |
2595 | ||
2596 | args = container_of(iter, struct nft_set_dump_args, iter); | |
2597 | return nf_tables_fill_setelem(args->skb, set, elem); | |
2598 | } | |
2599 | ||
2600 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) | |
2601 | { | |
2602 | const struct nft_set *set; | |
2603 | struct nft_set_dump_args args; | |
2604 | struct nft_ctx ctx; | |
2605 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; | |
2606 | struct nfgenmsg *nfmsg; | |
2607 | struct nlmsghdr *nlh; | |
2608 | struct nlattr *nest; | |
2609 | u32 portid, seq; | |
2610 | int event, err; | |
2611 | ||
720e0dfa MN |
2612 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
2613 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); | |
20a69341 PM |
2614 | if (err < 0) |
2615 | return err; | |
2616 | ||
2617 | err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla); | |
2618 | if (err < 0) | |
2619 | return err; | |
2620 | ||
2621 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2622 | if (IS_ERR(set)) | |
2623 | return PTR_ERR(set); | |
2624 | ||
2625 | event = NFT_MSG_NEWSETELEM; | |
2626 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2627 | portid = NETLINK_CB(cb->skb).portid; | |
2628 | seq = cb->nlh->nlmsg_seq; | |
2629 | ||
2630 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2631 | NLM_F_MULTI); | |
2632 | if (nlh == NULL) | |
2633 | goto nla_put_failure; | |
2634 | ||
2635 | nfmsg = nlmsg_data(nlh); | |
2636 | nfmsg->nfgen_family = NFPROTO_UNSPEC; | |
2637 | nfmsg->version = NFNETLINK_V0; | |
2638 | nfmsg->res_id = 0; | |
2639 | ||
2640 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) | |
2641 | goto nla_put_failure; | |
2642 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
2643 | goto nla_put_failure; | |
2644 | ||
2645 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
2646 | if (nest == NULL) | |
2647 | goto nla_put_failure; | |
2648 | ||
2649 | args.cb = cb; | |
2650 | args.skb = skb; | |
2651 | args.iter.skip = cb->args[0]; | |
2652 | args.iter.count = 0; | |
2653 | args.iter.err = 0; | |
2654 | args.iter.fn = nf_tables_dump_setelem; | |
2655 | set->ops->walk(&ctx, set, &args.iter); | |
2656 | ||
2657 | nla_nest_end(skb, nest); | |
2658 | nlmsg_end(skb, nlh); | |
2659 | ||
2660 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
2661 | return args.iter.err; | |
2662 | if (args.iter.count == cb->args[0]) | |
2663 | return 0; | |
2664 | ||
2665 | cb->args[0] = args.iter.count; | |
2666 | return skb->len; | |
2667 | ||
2668 | nla_put_failure: | |
2669 | return -ENOSPC; | |
2670 | } | |
2671 | ||
2672 | static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2673 | const struct nlmsghdr *nlh, | |
2674 | const struct nlattr * const nla[]) | |
2675 | { | |
2676 | const struct nft_set *set; | |
2677 | struct nft_ctx ctx; | |
2678 | int err; | |
2679 | ||
2680 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
2681 | if (err < 0) | |
2682 | return err; | |
2683 | ||
2684 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2685 | if (IS_ERR(set)) | |
2686 | return PTR_ERR(set); | |
2687 | ||
2688 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2689 | struct netlink_dump_control c = { | |
2690 | .dump = nf_tables_dump_set, | |
2691 | }; | |
2692 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
2693 | } | |
2694 | return -EOPNOTSUPP; | |
2695 | } | |
2696 | ||
2697 | static int nft_add_set_elem(const struct nft_ctx *ctx, struct nft_set *set, | |
2698 | const struct nlattr *attr) | |
2699 | { | |
2700 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
2701 | struct nft_data_desc d1, d2; | |
2702 | struct nft_set_elem elem; | |
2703 | struct nft_set_binding *binding; | |
2704 | enum nft_registers dreg; | |
2705 | int err; | |
2706 | ||
2707 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
2708 | nft_set_elem_policy); | |
2709 | if (err < 0) | |
2710 | return err; | |
2711 | ||
2712 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
2713 | return -EINVAL; | |
2714 | ||
2715 | elem.flags = 0; | |
2716 | if (nla[NFTA_SET_ELEM_FLAGS] != NULL) { | |
2717 | elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS])); | |
2718 | if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END) | |
2719 | return -EINVAL; | |
2720 | } | |
2721 | ||
2722 | if (set->flags & NFT_SET_MAP) { | |
2723 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
2724 | !(elem.flags & NFT_SET_ELEM_INTERVAL_END)) | |
2725 | return -EINVAL; | |
2726 | } else { | |
2727 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
2728 | return -EINVAL; | |
2729 | } | |
2730 | ||
2731 | err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]); | |
2732 | if (err < 0) | |
2733 | goto err1; | |
2734 | err = -EINVAL; | |
2735 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
2736 | goto err2; | |
2737 | ||
2738 | err = -EEXIST; | |
2739 | if (set->ops->get(set, &elem) == 0) | |
2740 | goto err2; | |
2741 | ||
2742 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { | |
2743 | err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]); | |
2744 | if (err < 0) | |
2745 | goto err2; | |
2746 | ||
2747 | err = -EINVAL; | |
2748 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
2749 | goto err3; | |
2750 | ||
2751 | dreg = nft_type_to_reg(set->dtype); | |
2752 | list_for_each_entry(binding, &set->bindings, list) { | |
2753 | struct nft_ctx bind_ctx = { | |
2754 | .afi = ctx->afi, | |
2755 | .table = ctx->table, | |
2756 | .chain = binding->chain, | |
2757 | }; | |
2758 | ||
2759 | err = nft_validate_data_load(&bind_ctx, dreg, | |
2760 | &elem.data, d2.type); | |
2761 | if (err < 0) | |
2762 | goto err3; | |
2763 | } | |
2764 | } | |
2765 | ||
2766 | err = set->ops->insert(set, &elem); | |
2767 | if (err < 0) | |
2768 | goto err3; | |
2769 | ||
2770 | return 0; | |
2771 | ||
2772 | err3: | |
2773 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
2774 | nft_data_uninit(&elem.data, d2.type); | |
2775 | err2: | |
2776 | nft_data_uninit(&elem.key, d1.type); | |
2777 | err1: | |
2778 | return err; | |
2779 | } | |
2780 | ||
2781 | static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2782 | const struct nlmsghdr *nlh, | |
2783 | const struct nlattr * const nla[]) | |
2784 | { | |
2785 | const struct nlattr *attr; | |
2786 | struct nft_set *set; | |
2787 | struct nft_ctx ctx; | |
2788 | int rem, err; | |
2789 | ||
2790 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
2791 | if (err < 0) | |
2792 | return err; | |
2793 | ||
2794 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2795 | if (IS_ERR(set)) | |
2796 | return PTR_ERR(set); | |
2797 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
2798 | return -EBUSY; | |
2799 | ||
2800 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
2801 | err = nft_add_set_elem(&ctx, set, attr); | |
2802 | if (err < 0) | |
2803 | return err; | |
2804 | } | |
2805 | return 0; | |
2806 | } | |
2807 | ||
2808 | static int nft_del_setelem(const struct nft_ctx *ctx, struct nft_set *set, | |
2809 | const struct nlattr *attr) | |
2810 | { | |
2811 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
2812 | struct nft_data_desc desc; | |
2813 | struct nft_set_elem elem; | |
2814 | int err; | |
2815 | ||
2816 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
2817 | nft_set_elem_policy); | |
2818 | if (err < 0) | |
2819 | goto err1; | |
2820 | ||
2821 | err = -EINVAL; | |
2822 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
2823 | goto err1; | |
2824 | ||
2825 | err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]); | |
2826 | if (err < 0) | |
2827 | goto err1; | |
2828 | ||
2829 | err = -EINVAL; | |
2830 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
2831 | goto err2; | |
2832 | ||
2833 | err = set->ops->get(set, &elem); | |
2834 | if (err < 0) | |
2835 | goto err2; | |
2836 | ||
2837 | set->ops->remove(set, &elem); | |
2838 | ||
2839 | nft_data_uninit(&elem.key, NFT_DATA_VALUE); | |
2840 | if (set->flags & NFT_SET_MAP) | |
2841 | nft_data_uninit(&elem.data, set->dtype); | |
2842 | ||
2843 | err2: | |
2844 | nft_data_uninit(&elem.key, desc.type); | |
2845 | err1: | |
2846 | return err; | |
2847 | } | |
2848 | ||
2849 | static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2850 | const struct nlmsghdr *nlh, | |
2851 | const struct nlattr * const nla[]) | |
2852 | { | |
2853 | const struct nlattr *attr; | |
2854 | struct nft_set *set; | |
2855 | struct nft_ctx ctx; | |
2856 | int rem, err; | |
2857 | ||
2858 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
2859 | if (err < 0) | |
2860 | return err; | |
2861 | ||
2862 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2863 | if (IS_ERR(set)) | |
2864 | return PTR_ERR(set); | |
2865 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
2866 | return -EBUSY; | |
2867 | ||
2868 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
2869 | err = nft_del_setelem(&ctx, set, attr); | |
2870 | if (err < 0) | |
2871 | return err; | |
2872 | } | |
2873 | return 0; | |
2874 | } | |
2875 | ||
96518518 PM |
2876 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
2877 | [NFT_MSG_NEWTABLE] = { | |
2878 | .call = nf_tables_newtable, | |
2879 | .attr_count = NFTA_TABLE_MAX, | |
2880 | .policy = nft_table_policy, | |
2881 | }, | |
2882 | [NFT_MSG_GETTABLE] = { | |
2883 | .call = nf_tables_gettable, | |
2884 | .attr_count = NFTA_TABLE_MAX, | |
2885 | .policy = nft_table_policy, | |
2886 | }, | |
2887 | [NFT_MSG_DELTABLE] = { | |
2888 | .call = nf_tables_deltable, | |
2889 | .attr_count = NFTA_TABLE_MAX, | |
2890 | .policy = nft_table_policy, | |
2891 | }, | |
2892 | [NFT_MSG_NEWCHAIN] = { | |
2893 | .call = nf_tables_newchain, | |
2894 | .attr_count = NFTA_CHAIN_MAX, | |
2895 | .policy = nft_chain_policy, | |
2896 | }, | |
2897 | [NFT_MSG_GETCHAIN] = { | |
2898 | .call = nf_tables_getchain, | |
2899 | .attr_count = NFTA_CHAIN_MAX, | |
2900 | .policy = nft_chain_policy, | |
2901 | }, | |
2902 | [NFT_MSG_DELCHAIN] = { | |
2903 | .call = nf_tables_delchain, | |
2904 | .attr_count = NFTA_CHAIN_MAX, | |
2905 | .policy = nft_chain_policy, | |
2906 | }, | |
2907 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 2908 | .call_batch = nf_tables_newrule, |
96518518 PM |
2909 | .attr_count = NFTA_RULE_MAX, |
2910 | .policy = nft_rule_policy, | |
2911 | }, | |
2912 | [NFT_MSG_GETRULE] = { | |
2913 | .call = nf_tables_getrule, | |
2914 | .attr_count = NFTA_RULE_MAX, | |
2915 | .policy = nft_rule_policy, | |
2916 | }, | |
2917 | [NFT_MSG_DELRULE] = { | |
0628b123 | 2918 | .call_batch = nf_tables_delrule, |
96518518 PM |
2919 | .attr_count = NFTA_RULE_MAX, |
2920 | .policy = nft_rule_policy, | |
2921 | }, | |
20a69341 PM |
2922 | [NFT_MSG_NEWSET] = { |
2923 | .call = nf_tables_newset, | |
2924 | .attr_count = NFTA_SET_MAX, | |
2925 | .policy = nft_set_policy, | |
2926 | }, | |
2927 | [NFT_MSG_GETSET] = { | |
2928 | .call = nf_tables_getset, | |
2929 | .attr_count = NFTA_SET_MAX, | |
2930 | .policy = nft_set_policy, | |
2931 | }, | |
2932 | [NFT_MSG_DELSET] = { | |
2933 | .call = nf_tables_delset, | |
2934 | .attr_count = NFTA_SET_MAX, | |
2935 | .policy = nft_set_policy, | |
2936 | }, | |
2937 | [NFT_MSG_NEWSETELEM] = { | |
2938 | .call = nf_tables_newsetelem, | |
2939 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
2940 | .policy = nft_set_elem_list_policy, | |
2941 | }, | |
2942 | [NFT_MSG_GETSETELEM] = { | |
2943 | .call = nf_tables_getsetelem, | |
2944 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
2945 | .policy = nft_set_elem_list_policy, | |
2946 | }, | |
2947 | [NFT_MSG_DELSETELEM] = { | |
2948 | .call = nf_tables_delsetelem, | |
2949 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
2950 | .policy = nft_set_elem_list_policy, | |
2951 | }, | |
96518518 PM |
2952 | }; |
2953 | ||
2954 | static const struct nfnetlink_subsystem nf_tables_subsys = { | |
2955 | .name = "nf_tables", | |
2956 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
2957 | .cb_count = NFT_MSG_MAX, | |
2958 | .cb = nf_tables_cb, | |
0628b123 PNA |
2959 | .commit = nf_tables_commit, |
2960 | .abort = nf_tables_abort, | |
96518518 PM |
2961 | }; |
2962 | ||
20a69341 PM |
2963 | /* |
2964 | * Loop detection - walk through the ruleset beginning at the destination chain | |
2965 | * of a new jump until either the source chain is reached (loop) or all | |
2966 | * reachable chains have been traversed. | |
2967 | * | |
2968 | * The loop check is performed whenever a new jump verdict is added to an | |
2969 | * expression or verdict map or a verdict map is bound to a new chain. | |
2970 | */ | |
2971 | ||
2972 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
2973 | const struct nft_chain *chain); | |
2974 | ||
2975 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
2976 | const struct nft_set *set, | |
2977 | const struct nft_set_iter *iter, | |
2978 | const struct nft_set_elem *elem) | |
2979 | { | |
2980 | switch (elem->data.verdict) { | |
2981 | case NFT_JUMP: | |
2982 | case NFT_GOTO: | |
2983 | return nf_tables_check_loops(ctx, elem->data.chain); | |
2984 | default: | |
2985 | return 0; | |
2986 | } | |
2987 | } | |
2988 | ||
2989 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
2990 | const struct nft_chain *chain) | |
2991 | { | |
2992 | const struct nft_rule *rule; | |
2993 | const struct nft_expr *expr, *last; | |
20a69341 PM |
2994 | const struct nft_set *set; |
2995 | struct nft_set_binding *binding; | |
2996 | struct nft_set_iter iter; | |
20a69341 PM |
2997 | |
2998 | if (ctx->chain == chain) | |
2999 | return -ELOOP; | |
3000 | ||
3001 | list_for_each_entry(rule, &chain->rules, list) { | |
3002 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
3003 | const struct nft_data *data = NULL; |
3004 | int err; | |
3005 | ||
3006 | if (!expr->ops->validate) | |
20a69341 PM |
3007 | continue; |
3008 | ||
0ca743a5 PNA |
3009 | err = expr->ops->validate(ctx, expr, &data); |
3010 | if (err < 0) | |
3011 | return err; | |
3012 | ||
20a69341 | 3013 | if (data == NULL) |
0ca743a5 | 3014 | continue; |
20a69341 PM |
3015 | |
3016 | switch (data->verdict) { | |
3017 | case NFT_JUMP: | |
3018 | case NFT_GOTO: | |
3019 | err = nf_tables_check_loops(ctx, data->chain); | |
3020 | if (err < 0) | |
3021 | return err; | |
3022 | default: | |
3023 | break; | |
3024 | } | |
3025 | } | |
3026 | } | |
3027 | ||
3028 | list_for_each_entry(set, &ctx->table->sets, list) { | |
3029 | if (!(set->flags & NFT_SET_MAP) || | |
3030 | set->dtype != NFT_DATA_VERDICT) | |
3031 | continue; | |
3032 | ||
3033 | list_for_each_entry(binding, &set->bindings, list) { | |
3034 | if (binding->chain != chain) | |
3035 | continue; | |
3036 | ||
3037 | iter.skip = 0; | |
3038 | iter.count = 0; | |
3039 | iter.err = 0; | |
3040 | iter.fn = nf_tables_loop_check_setelem; | |
3041 | ||
3042 | set->ops->walk(ctx, set, &iter); | |
3043 | if (iter.err < 0) | |
3044 | return iter.err; | |
3045 | } | |
3046 | } | |
3047 | ||
3048 | return 0; | |
3049 | } | |
3050 | ||
96518518 PM |
3051 | /** |
3052 | * nft_validate_input_register - validate an expressions' input register | |
3053 | * | |
3054 | * @reg: the register number | |
3055 | * | |
3056 | * Validate that the input register is one of the general purpose | |
3057 | * registers. | |
3058 | */ | |
3059 | int nft_validate_input_register(enum nft_registers reg) | |
3060 | { | |
3061 | if (reg <= NFT_REG_VERDICT) | |
3062 | return -EINVAL; | |
3063 | if (reg > NFT_REG_MAX) | |
3064 | return -ERANGE; | |
3065 | return 0; | |
3066 | } | |
3067 | EXPORT_SYMBOL_GPL(nft_validate_input_register); | |
3068 | ||
3069 | /** | |
3070 | * nft_validate_output_register - validate an expressions' output register | |
3071 | * | |
3072 | * @reg: the register number | |
3073 | * | |
3074 | * Validate that the output register is one of the general purpose | |
3075 | * registers or the verdict register. | |
3076 | */ | |
3077 | int nft_validate_output_register(enum nft_registers reg) | |
3078 | { | |
3079 | if (reg < NFT_REG_VERDICT) | |
3080 | return -EINVAL; | |
3081 | if (reg > NFT_REG_MAX) | |
3082 | return -ERANGE; | |
3083 | return 0; | |
3084 | } | |
3085 | EXPORT_SYMBOL_GPL(nft_validate_output_register); | |
3086 | ||
3087 | /** | |
3088 | * nft_validate_data_load - validate an expressions' data load | |
3089 | * | |
3090 | * @ctx: context of the expression performing the load | |
3091 | * @reg: the destination register number | |
3092 | * @data: the data to load | |
3093 | * @type: the data type | |
3094 | * | |
3095 | * Validate that a data load uses the appropriate data type for | |
3096 | * the destination register. A value of NULL for the data means | |
3097 | * that its runtime gathered data, which is always of type | |
3098 | * NFT_DATA_VALUE. | |
3099 | */ | |
3100 | int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg, | |
3101 | const struct nft_data *data, | |
3102 | enum nft_data_types type) | |
3103 | { | |
20a69341 PM |
3104 | int err; |
3105 | ||
96518518 PM |
3106 | switch (reg) { |
3107 | case NFT_REG_VERDICT: | |
3108 | if (data == NULL || type != NFT_DATA_VERDICT) | |
3109 | return -EINVAL; | |
20a69341 PM |
3110 | |
3111 | if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) { | |
3112 | err = nf_tables_check_loops(ctx, data->chain); | |
3113 | if (err < 0) | |
3114 | return err; | |
3115 | ||
3116 | if (ctx->chain->level + 1 > data->chain->level) { | |
3117 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) | |
3118 | return -EMLINK; | |
3119 | data->chain->level = ctx->chain->level + 1; | |
3120 | } | |
3121 | } | |
3122 | ||
96518518 PM |
3123 | return 0; |
3124 | default: | |
3125 | if (data != NULL && type != NFT_DATA_VALUE) | |
3126 | return -EINVAL; | |
3127 | return 0; | |
3128 | } | |
3129 | } | |
3130 | EXPORT_SYMBOL_GPL(nft_validate_data_load); | |
3131 | ||
3132 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
3133 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
3134 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
3135 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
3136 | }; | |
3137 | ||
3138 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3139 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3140 | { | |
3141 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; | |
3142 | struct nft_chain *chain; | |
3143 | int err; | |
3144 | ||
3145 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); | |
3146 | if (err < 0) | |
3147 | return err; | |
3148 | ||
3149 | if (!tb[NFTA_VERDICT_CODE]) | |
3150 | return -EINVAL; | |
3151 | data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); | |
3152 | ||
3153 | switch (data->verdict) { | |
3154 | case NF_ACCEPT: | |
3155 | case NF_DROP: | |
3156 | case NF_QUEUE: | |
3157 | case NFT_CONTINUE: | |
3158 | case NFT_BREAK: | |
3159 | case NFT_RETURN: | |
3160 | desc->len = sizeof(data->verdict); | |
3161 | break; | |
3162 | case NFT_JUMP: | |
3163 | case NFT_GOTO: | |
3164 | if (!tb[NFTA_VERDICT_CHAIN]) | |
3165 | return -EINVAL; | |
3166 | chain = nf_tables_chain_lookup(ctx->table, | |
3167 | tb[NFTA_VERDICT_CHAIN]); | |
3168 | if (IS_ERR(chain)) | |
3169 | return PTR_ERR(chain); | |
3170 | if (chain->flags & NFT_BASE_CHAIN) | |
3171 | return -EOPNOTSUPP; | |
3172 | ||
96518518 PM |
3173 | chain->use++; |
3174 | data->chain = chain; | |
3175 | desc->len = sizeof(data); | |
3176 | break; | |
3177 | default: | |
3178 | return -EINVAL; | |
3179 | } | |
3180 | ||
3181 | desc->type = NFT_DATA_VERDICT; | |
3182 | return 0; | |
3183 | } | |
3184 | ||
3185 | static void nft_verdict_uninit(const struct nft_data *data) | |
3186 | { | |
3187 | switch (data->verdict) { | |
3188 | case NFT_JUMP: | |
3189 | case NFT_GOTO: | |
3190 | data->chain->use--; | |
3191 | break; | |
3192 | } | |
3193 | } | |
3194 | ||
3195 | static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) | |
3196 | { | |
3197 | struct nlattr *nest; | |
3198 | ||
3199 | nest = nla_nest_start(skb, NFTA_DATA_VERDICT); | |
3200 | if (!nest) | |
3201 | goto nla_put_failure; | |
3202 | ||
3203 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict))) | |
3204 | goto nla_put_failure; | |
3205 | ||
3206 | switch (data->verdict) { | |
3207 | case NFT_JUMP: | |
3208 | case NFT_GOTO: | |
3209 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name)) | |
3210 | goto nla_put_failure; | |
3211 | } | |
3212 | nla_nest_end(skb, nest); | |
3213 | return 0; | |
3214 | ||
3215 | nla_put_failure: | |
3216 | return -1; | |
3217 | } | |
3218 | ||
3219 | static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3220 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3221 | { | |
3222 | unsigned int len; | |
3223 | ||
3224 | len = nla_len(nla); | |
3225 | if (len == 0) | |
3226 | return -EINVAL; | |
3227 | if (len > sizeof(data->data)) | |
3228 | return -EOVERFLOW; | |
3229 | ||
3230 | nla_memcpy(data->data, nla, sizeof(data->data)); | |
3231 | desc->type = NFT_DATA_VALUE; | |
3232 | desc->len = len; | |
3233 | return 0; | |
3234 | } | |
3235 | ||
3236 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
3237 | unsigned int len) | |
3238 | { | |
3239 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
3240 | } | |
3241 | ||
3242 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
3243 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY, | |
3244 | .len = FIELD_SIZEOF(struct nft_data, data) }, | |
3245 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, | |
3246 | }; | |
3247 | ||
3248 | /** | |
3249 | * nft_data_init - parse nf_tables data netlink attributes | |
3250 | * | |
3251 | * @ctx: context of the expression using the data | |
3252 | * @data: destination struct nft_data | |
3253 | * @desc: data description | |
3254 | * @nla: netlink attribute containing data | |
3255 | * | |
3256 | * Parse the netlink data attributes and initialize a struct nft_data. | |
3257 | * The type and length of data are returned in the data description. | |
3258 | * | |
3259 | * The caller can indicate that it only wants to accept data of type | |
3260 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
3261 | */ | |
3262 | int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3263 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3264 | { | |
3265 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
3266 | int err; | |
3267 | ||
3268 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); | |
3269 | if (err < 0) | |
3270 | return err; | |
3271 | ||
3272 | if (tb[NFTA_DATA_VALUE]) | |
3273 | return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); | |
3274 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) | |
3275 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
3276 | return -EINVAL; | |
3277 | } | |
3278 | EXPORT_SYMBOL_GPL(nft_data_init); | |
3279 | ||
3280 | /** | |
3281 | * nft_data_uninit - release a nft_data item | |
3282 | * | |
3283 | * @data: struct nft_data to release | |
3284 | * @type: type of data | |
3285 | * | |
3286 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
3287 | * all others need to be released by calling this function. | |
3288 | */ | |
3289 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) | |
3290 | { | |
3291 | switch (type) { | |
3292 | case NFT_DATA_VALUE: | |
3293 | return; | |
3294 | case NFT_DATA_VERDICT: | |
3295 | return nft_verdict_uninit(data); | |
3296 | default: | |
3297 | WARN_ON(1); | |
3298 | } | |
3299 | } | |
3300 | EXPORT_SYMBOL_GPL(nft_data_uninit); | |
3301 | ||
3302 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
3303 | enum nft_data_types type, unsigned int len) | |
3304 | { | |
3305 | struct nlattr *nest; | |
3306 | int err; | |
3307 | ||
3308 | nest = nla_nest_start(skb, attr); | |
3309 | if (nest == NULL) | |
3310 | return -1; | |
3311 | ||
3312 | switch (type) { | |
3313 | case NFT_DATA_VALUE: | |
3314 | err = nft_value_dump(skb, data, len); | |
3315 | break; | |
3316 | case NFT_DATA_VERDICT: | |
3317 | err = nft_verdict_dump(skb, data); | |
3318 | break; | |
3319 | default: | |
3320 | err = -EINVAL; | |
3321 | WARN_ON(1); | |
3322 | } | |
3323 | ||
3324 | nla_nest_end(skb, nest); | |
3325 | return err; | |
3326 | } | |
3327 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
3328 | ||
99633ab2 PNA |
3329 | static int nf_tables_init_net(struct net *net) |
3330 | { | |
3331 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 3332 | INIT_LIST_HEAD(&net->nft.commit_list); |
99633ab2 PNA |
3333 | return 0; |
3334 | } | |
3335 | ||
3336 | static struct pernet_operations nf_tables_net_ops = { | |
3337 | .init = nf_tables_init_net, | |
3338 | }; | |
3339 | ||
96518518 PM |
3340 | static int __init nf_tables_module_init(void) |
3341 | { | |
3342 | int err; | |
3343 | ||
3344 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
3345 | GFP_KERNEL); | |
3346 | if (info == NULL) { | |
3347 | err = -ENOMEM; | |
3348 | goto err1; | |
3349 | } | |
3350 | ||
3351 | err = nf_tables_core_module_init(); | |
3352 | if (err < 0) | |
3353 | goto err2; | |
3354 | ||
3355 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
3356 | if (err < 0) | |
3357 | goto err3; | |
3358 | ||
3359 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 3360 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
3361 | err3: |
3362 | nf_tables_core_module_exit(); | |
3363 | err2: | |
3364 | kfree(info); | |
3365 | err1: | |
3366 | return err; | |
3367 | } | |
3368 | ||
3369 | static void __exit nf_tables_module_exit(void) | |
3370 | { | |
99633ab2 | 3371 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
3372 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
3373 | nf_tables_core_module_exit(); | |
3374 | kfree(info); | |
3375 | } | |
3376 | ||
3377 | module_init(nf_tables_module_init); | |
3378 | module_exit(nf_tables_module_exit); | |
3379 | ||
3380 | MODULE_LICENSE("GPL"); | |
3381 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
3382 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |