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96518518 | 1 | /* |
20a69341 | 2 | * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netlink.h> | |
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 | ||
9370761c PNA |
127 | static struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX]; |
128 | ||
129 | static int __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) | |
130 | { | |
131 | int i; | |
132 | ||
133 | for (i=0; i<NFT_CHAIN_T_MAX; i++) { | |
134 | if (chain_type[family][i] != NULL && | |
135 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
136 | return i; | |
137 | } | |
138 | return -1; | |
139 | } | |
140 | ||
141 | static int nf_tables_chain_type_lookup(const struct nft_af_info *afi, | |
142 | const struct nlattr *nla, | |
143 | bool autoload) | |
144 | { | |
145 | int type; | |
146 | ||
147 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
148 | #ifdef CONFIG_MODULES | |
149 | if (type < 0 && autoload) { | |
150 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
151 | request_module("nft-chain-%u-%*.s", afi->family, | |
152 | nla_len(nla)-1, (const char *)nla_data(nla)); | |
153 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
154 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
155 | } | |
156 | #endif | |
157 | return type; | |
158 | } | |
159 | ||
96518518 PM |
160 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
161 | [NFTA_TABLE_NAME] = { .type = NLA_STRING }, | |
9ddf6323 | 162 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
163 | }; |
164 | ||
165 | static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq, | |
166 | int event, u32 flags, int family, | |
167 | const struct nft_table *table) | |
168 | { | |
169 | struct nlmsghdr *nlh; | |
170 | struct nfgenmsg *nfmsg; | |
171 | ||
172 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
173 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
174 | if (nlh == NULL) | |
175 | goto nla_put_failure; | |
176 | ||
177 | nfmsg = nlmsg_data(nlh); | |
178 | nfmsg->nfgen_family = family; | |
179 | nfmsg->version = NFNETLINK_V0; | |
180 | nfmsg->res_id = 0; | |
181 | ||
9ddf6323 | 182 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 TB |
183 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
184 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) | |
96518518 PM |
185 | goto nla_put_failure; |
186 | ||
187 | return nlmsg_end(skb, nlh); | |
188 | ||
189 | nla_put_failure: | |
190 | nlmsg_trim(skb, nlh); | |
191 | return -1; | |
192 | } | |
193 | ||
194 | static int nf_tables_table_notify(const struct sk_buff *oskb, | |
195 | const struct nlmsghdr *nlh, | |
196 | const struct nft_table *table, | |
197 | int event, int family) | |
198 | { | |
199 | struct sk_buff *skb; | |
200 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
201 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
202 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
203 | bool report; | |
204 | int err; | |
205 | ||
206 | report = nlh ? nlmsg_report(nlh) : false; | |
207 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
208 | return 0; | |
209 | ||
210 | err = -ENOBUFS; | |
211 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
212 | if (skb == NULL) | |
213 | goto err; | |
214 | ||
215 | err = nf_tables_fill_table_info(skb, portid, seq, event, 0, | |
216 | family, table); | |
217 | if (err < 0) { | |
218 | kfree_skb(skb); | |
219 | goto err; | |
220 | } | |
221 | ||
222 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
223 | GFP_KERNEL); | |
224 | err: | |
225 | if (err < 0) | |
226 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
227 | return err; | |
228 | } | |
229 | ||
230 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
231 | struct netlink_callback *cb) | |
232 | { | |
233 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
234 | const struct nft_af_info *afi; | |
235 | const struct nft_table *table; | |
236 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 237 | struct net *net = sock_net(skb->sk); |
96518518 PM |
238 | int family = nfmsg->nfgen_family; |
239 | ||
99633ab2 | 240 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
241 | if (family != NFPROTO_UNSPEC && family != afi->family) |
242 | continue; | |
243 | ||
244 | list_for_each_entry(table, &afi->tables, list) { | |
245 | if (idx < s_idx) | |
246 | goto cont; | |
247 | if (idx > s_idx) | |
248 | memset(&cb->args[1], 0, | |
249 | sizeof(cb->args) - sizeof(cb->args[0])); | |
250 | if (nf_tables_fill_table_info(skb, | |
251 | NETLINK_CB(cb->skb).portid, | |
252 | cb->nlh->nlmsg_seq, | |
253 | NFT_MSG_NEWTABLE, | |
254 | NLM_F_MULTI, | |
255 | afi->family, table) < 0) | |
256 | goto done; | |
257 | cont: | |
258 | idx++; | |
259 | } | |
260 | } | |
261 | done: | |
262 | cb->args[0] = idx; | |
263 | return skb->len; | |
264 | } | |
265 | ||
266 | static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb, | |
267 | const struct nlmsghdr *nlh, | |
268 | const struct nlattr * const nla[]) | |
269 | { | |
270 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
271 | const struct nft_af_info *afi; | |
272 | const struct nft_table *table; | |
273 | struct sk_buff *skb2; | |
99633ab2 | 274 | struct net *net = sock_net(skb->sk); |
96518518 PM |
275 | int family = nfmsg->nfgen_family; |
276 | int err; | |
277 | ||
278 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
279 | struct netlink_dump_control c = { | |
280 | .dump = nf_tables_dump_tables, | |
281 | }; | |
282 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
283 | } | |
284 | ||
99633ab2 | 285 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
286 | if (IS_ERR(afi)) |
287 | return PTR_ERR(afi); | |
288 | ||
9370761c | 289 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
290 | if (IS_ERR(table)) |
291 | return PTR_ERR(table); | |
292 | ||
293 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
294 | if (!skb2) | |
295 | return -ENOMEM; | |
296 | ||
297 | err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid, | |
298 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, | |
299 | family, table); | |
300 | if (err < 0) | |
301 | goto err; | |
302 | ||
303 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
304 | ||
305 | err: | |
306 | kfree_skb(skb2); | |
307 | return err; | |
308 | } | |
309 | ||
115a60b1 PM |
310 | static int nf_tables_table_enable(const struct nft_af_info *afi, |
311 | struct nft_table *table) | |
9ddf6323 PNA |
312 | { |
313 | struct nft_chain *chain; | |
314 | int err, i = 0; | |
315 | ||
316 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
317 | if (!(chain->flags & NFT_BASE_CHAIN)) |
318 | continue; | |
319 | ||
115a60b1 | 320 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
321 | if (err < 0) |
322 | goto err; | |
323 | ||
324 | i++; | |
325 | } | |
326 | return 0; | |
327 | err: | |
328 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
329 | if (!(chain->flags & NFT_BASE_CHAIN)) |
330 | continue; | |
331 | ||
9ddf6323 PNA |
332 | if (i-- <= 0) |
333 | break; | |
334 | ||
115a60b1 | 335 | nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
336 | } |
337 | return err; | |
338 | } | |
339 | ||
115a60b1 PM |
340 | static int nf_tables_table_disable(const struct nft_af_info *afi, |
341 | struct nft_table *table) | |
9ddf6323 PNA |
342 | { |
343 | struct nft_chain *chain; | |
344 | ||
d2012975 PNA |
345 | list_for_each_entry(chain, &table->chains, list) { |
346 | if (chain->flags & NFT_BASE_CHAIN) | |
115a60b1 PM |
347 | nf_unregister_hooks(nft_base_chain(chain)->ops, |
348 | afi->nops); | |
d2012975 | 349 | } |
9ddf6323 PNA |
350 | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static int nf_tables_updtable(struct sock *nlsk, struct sk_buff *skb, | |
355 | const struct nlmsghdr *nlh, | |
356 | const struct nlattr * const nla[], | |
357 | struct nft_af_info *afi, struct nft_table *table) | |
358 | { | |
359 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
360 | int family = nfmsg->nfgen_family, ret = 0; | |
361 | ||
362 | if (nla[NFTA_TABLE_FLAGS]) { | |
363 | __be32 flags; | |
364 | ||
365 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
366 | if (flags & ~NFT_TABLE_F_DORMANT) | |
367 | return -EINVAL; | |
368 | ||
369 | if ((flags & NFT_TABLE_F_DORMANT) && | |
370 | !(table->flags & NFT_TABLE_F_DORMANT)) { | |
115a60b1 | 371 | ret = nf_tables_table_disable(afi, table); |
9ddf6323 PNA |
372 | if (ret >= 0) |
373 | table->flags |= NFT_TABLE_F_DORMANT; | |
374 | } else if (!(flags & NFT_TABLE_F_DORMANT) && | |
375 | table->flags & NFT_TABLE_F_DORMANT) { | |
115a60b1 | 376 | ret = nf_tables_table_enable(afi, table); |
9ddf6323 PNA |
377 | if (ret >= 0) |
378 | table->flags &= ~NFT_TABLE_F_DORMANT; | |
379 | } | |
380 | if (ret < 0) | |
381 | goto err; | |
382 | } | |
383 | ||
384 | nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family); | |
385 | err: | |
386 | return ret; | |
387 | } | |
388 | ||
96518518 PM |
389 | static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb, |
390 | const struct nlmsghdr *nlh, | |
391 | const struct nlattr * const nla[]) | |
392 | { | |
393 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
394 | const struct nlattr *name; | |
395 | struct nft_af_info *afi; | |
396 | struct nft_table *table; | |
99633ab2 | 397 | struct net *net = sock_net(skb->sk); |
96518518 PM |
398 | int family = nfmsg->nfgen_family; |
399 | ||
99633ab2 | 400 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
401 | if (IS_ERR(afi)) |
402 | return PTR_ERR(afi); | |
403 | ||
404 | name = nla[NFTA_TABLE_NAME]; | |
9370761c | 405 | table = nf_tables_table_lookup(afi, name); |
96518518 PM |
406 | if (IS_ERR(table)) { |
407 | if (PTR_ERR(table) != -ENOENT) | |
408 | return PTR_ERR(table); | |
409 | table = NULL; | |
410 | } | |
411 | ||
412 | if (table != NULL) { | |
413 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
414 | return -EEXIST; | |
415 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
416 | return -EOPNOTSUPP; | |
9ddf6323 | 417 | return nf_tables_updtable(nlsk, skb, nlh, nla, afi, table); |
96518518 PM |
418 | } |
419 | ||
420 | table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL); | |
421 | if (table == NULL) | |
422 | return -ENOMEM; | |
423 | ||
424 | nla_strlcpy(table->name, name, nla_len(name)); | |
425 | INIT_LIST_HEAD(&table->chains); | |
20a69341 | 426 | INIT_LIST_HEAD(&table->sets); |
96518518 | 427 | |
9ddf6323 PNA |
428 | if (nla[NFTA_TABLE_FLAGS]) { |
429 | __be32 flags; | |
430 | ||
431 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
432 | if (flags & ~NFT_TABLE_F_DORMANT) { | |
433 | kfree(table); | |
434 | return -EINVAL; | |
435 | } | |
436 | ||
437 | table->flags |= flags; | |
438 | } | |
439 | ||
96518518 PM |
440 | list_add_tail(&table->list, &afi->tables); |
441 | nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family); | |
442 | return 0; | |
443 | } | |
444 | ||
445 | static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb, | |
446 | const struct nlmsghdr *nlh, | |
447 | const struct nlattr * const nla[]) | |
448 | { | |
449 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
450 | struct nft_af_info *afi; | |
451 | struct nft_table *table; | |
99633ab2 | 452 | struct net *net = sock_net(skb->sk); |
96518518 PM |
453 | int family = nfmsg->nfgen_family; |
454 | ||
99633ab2 | 455 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
456 | if (IS_ERR(afi)) |
457 | return PTR_ERR(afi); | |
458 | ||
9370761c | 459 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
460 | if (IS_ERR(table)) |
461 | return PTR_ERR(table); | |
462 | ||
96518518 PM |
463 | if (table->use) |
464 | return -EBUSY; | |
465 | ||
466 | list_del(&table->list); | |
467 | nf_tables_table_notify(skb, nlh, table, NFT_MSG_DELTABLE, family); | |
468 | kfree(table); | |
469 | return 0; | |
470 | } | |
471 | ||
9370761c | 472 | int nft_register_chain_type(struct nf_chain_type *ctype) |
96518518 | 473 | { |
9370761c | 474 | int err = 0; |
96518518 PM |
475 | |
476 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
9370761c PNA |
477 | if (chain_type[ctype->family][ctype->type] != NULL) { |
478 | err = -EBUSY; | |
479 | goto out; | |
96518518 PM |
480 | } |
481 | ||
9370761c PNA |
482 | if (!try_module_get(ctype->me)) |
483 | goto out; | |
96518518 | 484 | |
9370761c PNA |
485 | chain_type[ctype->family][ctype->type] = ctype; |
486 | out: | |
96518518 PM |
487 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
488 | return err; | |
489 | } | |
9370761c | 490 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 491 | |
9370761c | 492 | void nft_unregister_chain_type(struct nf_chain_type *ctype) |
96518518 | 493 | { |
96518518 | 494 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c PNA |
495 | chain_type[ctype->family][ctype->type] = NULL; |
496 | module_put(ctype->me); | |
96518518 PM |
497 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
498 | } | |
9370761c | 499 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
500 | |
501 | /* | |
502 | * Chains | |
503 | */ | |
504 | ||
505 | static struct nft_chain * | |
506 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) | |
507 | { | |
508 | struct nft_chain *chain; | |
509 | ||
510 | list_for_each_entry(chain, &table->chains, list) { | |
511 | if (chain->handle == handle) | |
512 | return chain; | |
513 | } | |
514 | ||
515 | return ERR_PTR(-ENOENT); | |
516 | } | |
517 | ||
518 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
519 | const struct nlattr *nla) | |
520 | { | |
521 | struct nft_chain *chain; | |
522 | ||
523 | if (nla == NULL) | |
524 | return ERR_PTR(-EINVAL); | |
525 | ||
526 | list_for_each_entry(chain, &table->chains, list) { | |
527 | if (!nla_strcmp(nla, chain->name)) | |
528 | return chain; | |
529 | } | |
530 | ||
531 | return ERR_PTR(-ENOENT); | |
532 | } | |
533 | ||
534 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
535 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, | |
536 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, | |
537 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
538 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
539 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 540 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
9370761c | 541 | [NFTA_CHAIN_TYPE] = { .type = NLA_NUL_STRING }, |
0ca743a5 | 542 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
543 | }; |
544 | ||
545 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
546 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
547 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
548 | }; | |
549 | ||
0ca743a5 PNA |
550 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
551 | { | |
552 | struct nft_stats *cpu_stats, total; | |
553 | struct nlattr *nest; | |
554 | int cpu; | |
555 | ||
556 | memset(&total, 0, sizeof(total)); | |
557 | for_each_possible_cpu(cpu) { | |
558 | cpu_stats = per_cpu_ptr(stats, cpu); | |
559 | total.pkts += cpu_stats->pkts; | |
560 | total.bytes += cpu_stats->bytes; | |
561 | } | |
562 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
563 | if (nest == NULL) | |
564 | goto nla_put_failure; | |
565 | ||
566 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) || | |
567 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes))) | |
568 | goto nla_put_failure; | |
569 | ||
570 | nla_nest_end(skb, nest); | |
571 | return 0; | |
572 | ||
573 | nla_put_failure: | |
574 | return -ENOSPC; | |
575 | } | |
576 | ||
96518518 PM |
577 | static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq, |
578 | int event, u32 flags, int family, | |
579 | const struct nft_table *table, | |
580 | const struct nft_chain *chain) | |
581 | { | |
582 | struct nlmsghdr *nlh; | |
583 | struct nfgenmsg *nfmsg; | |
584 | ||
585 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
586 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
587 | if (nlh == NULL) | |
588 | goto nla_put_failure; | |
589 | ||
590 | nfmsg = nlmsg_data(nlh); | |
591 | nfmsg->nfgen_family = family; | |
592 | nfmsg->version = NFNETLINK_V0; | |
593 | nfmsg->res_id = 0; | |
594 | ||
595 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
596 | goto nla_put_failure; | |
597 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle))) | |
598 | goto nla_put_failure; | |
599 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
600 | goto nla_put_failure; | |
601 | ||
602 | if (chain->flags & NFT_BASE_CHAIN) { | |
0ca743a5 | 603 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 604 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
605 | struct nlattr *nest; |
606 | ||
607 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
608 | if (nest == NULL) |
609 | goto nla_put_failure; | |
610 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
611 | goto nla_put_failure; | |
612 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
613 | goto nla_put_failure; | |
614 | nla_nest_end(skb, nest); | |
9370761c | 615 | |
0ca743a5 PNA |
616 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
617 | htonl(basechain->policy))) | |
618 | goto nla_put_failure; | |
619 | ||
9370761c PNA |
620 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, |
621 | chain_type[ops->pf][nft_base_chain(chain)->type]->name)) | |
622 | goto nla_put_failure; | |
0ca743a5 PNA |
623 | |
624 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
625 | goto nla_put_failure; | |
96518518 PM |
626 | } |
627 | ||
0ca743a5 PNA |
628 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
629 | goto nla_put_failure; | |
630 | ||
96518518 PM |
631 | return nlmsg_end(skb, nlh); |
632 | ||
633 | nla_put_failure: | |
634 | nlmsg_trim(skb, nlh); | |
635 | return -1; | |
636 | } | |
637 | ||
638 | static int nf_tables_chain_notify(const struct sk_buff *oskb, | |
639 | const struct nlmsghdr *nlh, | |
640 | const struct nft_table *table, | |
641 | const struct nft_chain *chain, | |
642 | int event, int family) | |
643 | { | |
644 | struct sk_buff *skb; | |
645 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
646 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
647 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
648 | bool report; | |
649 | int err; | |
650 | ||
651 | report = nlh ? nlmsg_report(nlh) : false; | |
652 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
653 | return 0; | |
654 | ||
655 | err = -ENOBUFS; | |
656 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
657 | if (skb == NULL) | |
658 | goto err; | |
659 | ||
660 | err = nf_tables_fill_chain_info(skb, portid, seq, event, 0, family, | |
661 | table, chain); | |
662 | if (err < 0) { | |
663 | kfree_skb(skb); | |
664 | goto err; | |
665 | } | |
666 | ||
667 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
668 | GFP_KERNEL); | |
669 | err: | |
670 | if (err < 0) | |
671 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
672 | return err; | |
673 | } | |
674 | ||
675 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
676 | struct netlink_callback *cb) | |
677 | { | |
678 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
679 | const struct nft_af_info *afi; | |
680 | const struct nft_table *table; | |
681 | const struct nft_chain *chain; | |
682 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 683 | struct net *net = sock_net(skb->sk); |
96518518 PM |
684 | int family = nfmsg->nfgen_family; |
685 | ||
99633ab2 | 686 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
687 | if (family != NFPROTO_UNSPEC && family != afi->family) |
688 | continue; | |
689 | ||
690 | list_for_each_entry(table, &afi->tables, list) { | |
691 | list_for_each_entry(chain, &table->chains, list) { | |
692 | if (idx < s_idx) | |
693 | goto cont; | |
694 | if (idx > s_idx) | |
695 | memset(&cb->args[1], 0, | |
696 | sizeof(cb->args) - sizeof(cb->args[0])); | |
697 | if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid, | |
698 | cb->nlh->nlmsg_seq, | |
699 | NFT_MSG_NEWCHAIN, | |
700 | NLM_F_MULTI, | |
701 | afi->family, table, chain) < 0) | |
702 | goto done; | |
703 | cont: | |
704 | idx++; | |
705 | } | |
706 | } | |
707 | } | |
708 | done: | |
709 | cb->args[0] = idx; | |
710 | return skb->len; | |
711 | } | |
712 | ||
713 | ||
714 | static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb, | |
715 | const struct nlmsghdr *nlh, | |
716 | const struct nlattr * const nla[]) | |
717 | { | |
718 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
719 | const struct nft_af_info *afi; | |
720 | const struct nft_table *table; | |
721 | const struct nft_chain *chain; | |
722 | struct sk_buff *skb2; | |
99633ab2 | 723 | struct net *net = sock_net(skb->sk); |
96518518 PM |
724 | int family = nfmsg->nfgen_family; |
725 | int err; | |
726 | ||
727 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
728 | struct netlink_dump_control c = { | |
729 | .dump = nf_tables_dump_chains, | |
730 | }; | |
731 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
732 | } | |
733 | ||
99633ab2 | 734 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
735 | if (IS_ERR(afi)) |
736 | return PTR_ERR(afi); | |
737 | ||
9370761c | 738 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
739 | if (IS_ERR(table)) |
740 | return PTR_ERR(table); | |
741 | ||
742 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
743 | if (IS_ERR(chain)) | |
744 | return PTR_ERR(chain); | |
745 | ||
746 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
747 | if (!skb2) | |
748 | return -ENOMEM; | |
749 | ||
750 | err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid, | |
751 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, | |
752 | family, table, chain); | |
753 | if (err < 0) | |
754 | goto err; | |
755 | ||
756 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
757 | ||
758 | err: | |
759 | kfree_skb(skb2); | |
760 | return err; | |
761 | } | |
762 | ||
0ca743a5 PNA |
763 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
764 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
765 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
766 | }; | |
767 | ||
768 | static int | |
769 | nf_tables_counters(struct nft_base_chain *chain, const struct nlattr *attr) | |
770 | { | |
771 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
772 | struct nft_stats __percpu *newstats; | |
773 | struct nft_stats *stats; | |
774 | int err; | |
775 | ||
776 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); | |
777 | if (err < 0) | |
778 | return err; | |
779 | ||
780 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
781 | return -EINVAL; | |
782 | ||
783 | newstats = alloc_percpu(struct nft_stats); | |
784 | if (newstats == NULL) | |
785 | return -ENOMEM; | |
786 | ||
787 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
788 | * are not exposed to userspace. | |
789 | */ | |
790 | stats = this_cpu_ptr(newstats); | |
791 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
792 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
793 | ||
794 | if (chain->stats) { | |
795 | /* nfnl_lock is held, add some nfnl function for this, later */ | |
796 | struct nft_stats __percpu *oldstats = | |
797 | rcu_dereference_protected(chain->stats, 1); | |
798 | ||
799 | rcu_assign_pointer(chain->stats, newstats); | |
800 | synchronize_rcu(); | |
801 | free_percpu(oldstats); | |
802 | } else | |
803 | rcu_assign_pointer(chain->stats, newstats); | |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
96518518 PM |
808 | static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb, |
809 | const struct nlmsghdr *nlh, | |
810 | const struct nlattr * const nla[]) | |
811 | { | |
812 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
813 | const struct nlattr * uninitialized_var(name); | |
814 | const struct nft_af_info *afi; | |
815 | struct nft_table *table; | |
816 | struct nft_chain *chain; | |
0ca743a5 | 817 | struct nft_base_chain *basechain = NULL; |
96518518 | 818 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
99633ab2 | 819 | struct net *net = sock_net(skb->sk); |
96518518 | 820 | int family = nfmsg->nfgen_family; |
57de2a0c | 821 | u8 policy = NF_ACCEPT; |
96518518 | 822 | u64 handle = 0; |
115a60b1 | 823 | unsigned int i; |
96518518 PM |
824 | int err; |
825 | bool create; | |
826 | ||
827 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
828 | ||
99633ab2 | 829 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
830 | if (IS_ERR(afi)) |
831 | return PTR_ERR(afi); | |
832 | ||
9370761c | 833 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
834 | if (IS_ERR(table)) |
835 | return PTR_ERR(table); | |
836 | ||
96518518 PM |
837 | chain = NULL; |
838 | name = nla[NFTA_CHAIN_NAME]; | |
839 | ||
840 | if (nla[NFTA_CHAIN_HANDLE]) { | |
841 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
842 | chain = nf_tables_chain_lookup_byhandle(table, handle); | |
843 | if (IS_ERR(chain)) | |
844 | return PTR_ERR(chain); | |
845 | } else { | |
846 | chain = nf_tables_chain_lookup(table, name); | |
847 | if (IS_ERR(chain)) { | |
848 | if (PTR_ERR(chain) != -ENOENT) | |
849 | return PTR_ERR(chain); | |
850 | chain = NULL; | |
851 | } | |
852 | } | |
853 | ||
57de2a0c PM |
854 | if (nla[NFTA_CHAIN_POLICY]) { |
855 | if ((chain != NULL && | |
856 | !(chain->flags & NFT_BASE_CHAIN)) || | |
857 | nla[NFTA_CHAIN_HOOK] == NULL) | |
858 | return -EOPNOTSUPP; | |
859 | ||
860 | policy = nla_get_be32(nla[NFTA_CHAIN_POLICY]); | |
861 | switch (policy) { | |
862 | case NF_DROP: | |
863 | case NF_ACCEPT: | |
864 | break; | |
865 | default: | |
866 | return -EINVAL; | |
867 | } | |
868 | } | |
869 | ||
96518518 PM |
870 | if (chain != NULL) { |
871 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
872 | return -EEXIST; | |
873 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
874 | return -EOPNOTSUPP; | |
875 | ||
876 | if (nla[NFTA_CHAIN_HANDLE] && name && | |
877 | !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) | |
878 | return -EEXIST; | |
879 | ||
0ca743a5 PNA |
880 | if (nla[NFTA_CHAIN_COUNTERS]) { |
881 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
882 | return -EOPNOTSUPP; | |
883 | ||
884 | err = nf_tables_counters(nft_base_chain(chain), | |
885 | nla[NFTA_CHAIN_COUNTERS]); | |
886 | if (err < 0) | |
887 | return err; | |
888 | } | |
889 | ||
4401a862 PM |
890 | if (nla[NFTA_CHAIN_POLICY]) |
891 | nft_base_chain(chain)->policy = policy; | |
892 | ||
96518518 PM |
893 | if (nla[NFTA_CHAIN_HANDLE] && name) |
894 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); | |
895 | ||
896 | goto notify; | |
897 | } | |
898 | ||
75820676 PM |
899 | if (table->use == UINT_MAX) |
900 | return -EOVERFLOW; | |
901 | ||
96518518 PM |
902 | if (nla[NFTA_CHAIN_HOOK]) { |
903 | struct nf_hook_ops *ops; | |
9370761c | 904 | nf_hookfn *hookfn; |
115a60b1 | 905 | u32 hooknum, priority; |
9370761c PNA |
906 | int type = NFT_CHAIN_T_DEFAULT; |
907 | ||
908 | if (nla[NFTA_CHAIN_TYPE]) { | |
909 | type = nf_tables_chain_type_lookup(afi, | |
910 | nla[NFTA_CHAIN_TYPE], | |
911 | create); | |
912 | if (type < 0) | |
913 | return -ENOENT; | |
914 | } | |
96518518 PM |
915 | |
916 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
917 | nft_hook_policy); | |
918 | if (err < 0) | |
919 | return err; | |
920 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
921 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
922 | return -EINVAL; | |
9370761c PNA |
923 | |
924 | hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
925 | if (hooknum >= afi->nhooks) | |
96518518 | 926 | return -EINVAL; |
115a60b1 | 927 | priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
96518518 | 928 | |
3b088c4b | 929 | if (!(chain_type[family][type]->hook_mask & (1 << hooknum))) |
9370761c | 930 | return -EOPNOTSUPP; |
3b088c4b | 931 | hookfn = chain_type[family][type]->fn[hooknum]; |
9370761c | 932 | |
96518518 PM |
933 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
934 | if (basechain == NULL) | |
935 | return -ENOMEM; | |
9370761c | 936 | |
4401a862 PM |
937 | if (nla[NFTA_CHAIN_COUNTERS]) { |
938 | err = nf_tables_counters(basechain, | |
939 | nla[NFTA_CHAIN_COUNTERS]); | |
940 | if (err < 0) { | |
941 | kfree(basechain); | |
942 | return err; | |
943 | } | |
944 | } else { | |
945 | struct nft_stats __percpu *newstats; | |
946 | ||
947 | newstats = alloc_percpu(struct nft_stats); | |
948 | if (newstats == NULL) { | |
949 | kfree(basechain); | |
950 | return -ENOMEM; | |
951 | } | |
952 | rcu_assign_pointer(basechain->stats, newstats); | |
953 | } | |
954 | ||
9370761c | 955 | basechain->type = type; |
96518518 PM |
956 | chain = &basechain->chain; |
957 | ||
115a60b1 PM |
958 | for (i = 0; i < afi->nops; i++) { |
959 | ops = &basechain->ops[i]; | |
960 | ops->pf = family; | |
961 | ops->owner = afi->owner; | |
962 | ops->hooknum = hooknum; | |
963 | ops->priority = priority; | |
964 | ops->priv = chain; | |
965 | ops->hook = afi->hooks[ops->hooknum]; | |
966 | if (hookfn) | |
967 | ops->hook = hookfn; | |
968 | if (afi->hook_ops_init) | |
969 | afi->hook_ops_init(ops, i); | |
970 | } | |
96518518 PM |
971 | |
972 | chain->flags |= NFT_BASE_CHAIN; | |
57de2a0c | 973 | basechain->policy = policy; |
96518518 PM |
974 | } else { |
975 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
976 | if (chain == NULL) | |
977 | return -ENOMEM; | |
978 | } | |
979 | ||
980 | INIT_LIST_HEAD(&chain->rules); | |
981 | chain->handle = nf_tables_alloc_handle(table); | |
0628b123 | 982 | chain->net = net; |
b5bc89bf | 983 | chain->table = table; |
96518518 PM |
984 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
985 | ||
9ddf6323 PNA |
986 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
987 | chain->flags & NFT_BASE_CHAIN) { | |
115a60b1 | 988 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
0ca743a5 PNA |
989 | if (err < 0) { |
990 | free_percpu(basechain->stats); | |
991 | kfree(basechain); | |
992 | return err; | |
993 | } | |
994 | } | |
9ddf6323 PNA |
995 | list_add_tail(&chain->list, &table->chains); |
996 | table->use++; | |
96518518 PM |
997 | notify: |
998 | nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_NEWCHAIN, | |
999 | family); | |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | static void nf_tables_rcu_chain_destroy(struct rcu_head *head) | |
1004 | { | |
1005 | struct nft_chain *chain = container_of(head, struct nft_chain, rcu_head); | |
1006 | ||
1007 | BUG_ON(chain->use > 0); | |
1008 | ||
0ca743a5 PNA |
1009 | if (chain->flags & NFT_BASE_CHAIN) { |
1010 | free_percpu(nft_base_chain(chain)->stats); | |
96518518 | 1011 | kfree(nft_base_chain(chain)); |
0ca743a5 | 1012 | } else |
96518518 PM |
1013 | kfree(chain); |
1014 | } | |
1015 | ||
1016 | static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb, | |
1017 | const struct nlmsghdr *nlh, | |
1018 | const struct nlattr * const nla[]) | |
1019 | { | |
1020 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1021 | const struct nft_af_info *afi; | |
1022 | struct nft_table *table; | |
1023 | struct nft_chain *chain; | |
99633ab2 | 1024 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1025 | int family = nfmsg->nfgen_family; |
1026 | ||
99633ab2 | 1027 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1028 | if (IS_ERR(afi)) |
1029 | return PTR_ERR(afi); | |
1030 | ||
9370761c | 1031 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
1032 | if (IS_ERR(table)) |
1033 | return PTR_ERR(table); | |
1034 | ||
1035 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
1036 | if (IS_ERR(chain)) | |
1037 | return PTR_ERR(chain); | |
1038 | ||
96518518 PM |
1039 | if (!list_empty(&chain->rules)) |
1040 | return -EBUSY; | |
1041 | ||
1042 | list_del(&chain->list); | |
1043 | table->use--; | |
1044 | ||
9ddf6323 PNA |
1045 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
1046 | chain->flags & NFT_BASE_CHAIN) | |
115a60b1 | 1047 | nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
96518518 PM |
1048 | |
1049 | nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN, | |
1050 | family); | |
1051 | ||
1052 | /* Make sure all rule references are gone before this is released */ | |
1053 | call_rcu(&chain->rcu_head, nf_tables_rcu_chain_destroy); | |
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | static void nft_ctx_init(struct nft_ctx *ctx, | |
20a69341 PM |
1058 | const struct sk_buff *skb, |
1059 | const struct nlmsghdr *nlh, | |
96518518 PM |
1060 | const struct nft_af_info *afi, |
1061 | const struct nft_table *table, | |
0ca743a5 PNA |
1062 | const struct nft_chain *chain, |
1063 | const struct nlattr * const *nla) | |
96518518 | 1064 | { |
99633ab2 | 1065 | ctx->net = sock_net(skb->sk); |
20a69341 PM |
1066 | ctx->skb = skb; |
1067 | ctx->nlh = nlh; | |
96518518 PM |
1068 | ctx->afi = afi; |
1069 | ctx->table = table; | |
1070 | ctx->chain = chain; | |
0ca743a5 | 1071 | ctx->nla = nla; |
96518518 PM |
1072 | } |
1073 | ||
1074 | /* | |
1075 | * Expressions | |
1076 | */ | |
1077 | ||
1078 | /** | |
ef1f7df9 PM |
1079 | * nft_register_expr - register nf_tables expr type |
1080 | * @ops: expr type | |
96518518 | 1081 | * |
ef1f7df9 | 1082 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1083 | * success or a negative errno code otherwise. |
1084 | */ | |
ef1f7df9 | 1085 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1086 | { |
1087 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
ef1f7df9 | 1088 | list_add_tail(&type->list, &nf_tables_expressions); |
96518518 PM |
1089 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1090 | return 0; | |
1091 | } | |
1092 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1093 | ||
1094 | /** | |
ef1f7df9 PM |
1095 | * nft_unregister_expr - unregister nf_tables expr type |
1096 | * @ops: expr type | |
96518518 | 1097 | * |
ef1f7df9 | 1098 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1099 | */ |
ef1f7df9 | 1100 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1101 | { |
1102 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
ef1f7df9 | 1103 | list_del(&type->list); |
96518518 PM |
1104 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1105 | } | |
1106 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1107 | ||
ef1f7df9 | 1108 | static const struct nft_expr_type *__nft_expr_type_get(struct nlattr *nla) |
96518518 | 1109 | { |
ef1f7df9 | 1110 | const struct nft_expr_type *type; |
96518518 | 1111 | |
ef1f7df9 PM |
1112 | list_for_each_entry(type, &nf_tables_expressions, list) { |
1113 | if (!nla_strcmp(nla, type->name)) | |
1114 | return type; | |
96518518 PM |
1115 | } |
1116 | return NULL; | |
1117 | } | |
1118 | ||
ef1f7df9 | 1119 | static const struct nft_expr_type *nft_expr_type_get(struct nlattr *nla) |
96518518 | 1120 | { |
ef1f7df9 | 1121 | const struct nft_expr_type *type; |
96518518 PM |
1122 | |
1123 | if (nla == NULL) | |
1124 | return ERR_PTR(-EINVAL); | |
1125 | ||
ef1f7df9 PM |
1126 | type = __nft_expr_type_get(nla); |
1127 | if (type != NULL && try_module_get(type->owner)) | |
1128 | return type; | |
96518518 PM |
1129 | |
1130 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1131 | if (type == NULL) { |
96518518 PM |
1132 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1133 | request_module("nft-expr-%.*s", | |
1134 | nla_len(nla), (char *)nla_data(nla)); | |
1135 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
ef1f7df9 | 1136 | if (__nft_expr_type_get(nla)) |
96518518 PM |
1137 | return ERR_PTR(-EAGAIN); |
1138 | } | |
1139 | #endif | |
1140 | return ERR_PTR(-ENOENT); | |
1141 | } | |
1142 | ||
1143 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1144 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1145 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1146 | }; | |
1147 | ||
1148 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1149 | const struct nft_expr *expr) | |
1150 | { | |
ef1f7df9 | 1151 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1152 | goto nla_put_failure; |
1153 | ||
1154 | if (expr->ops->dump) { | |
1155 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1156 | if (data == NULL) | |
1157 | goto nla_put_failure; | |
1158 | if (expr->ops->dump(skb, expr) < 0) | |
1159 | goto nla_put_failure; | |
1160 | nla_nest_end(skb, data); | |
1161 | } | |
1162 | ||
1163 | return skb->len; | |
1164 | ||
1165 | nla_put_failure: | |
1166 | return -1; | |
1167 | }; | |
1168 | ||
1169 | struct nft_expr_info { | |
1170 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1171 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1172 | }; |
1173 | ||
0ca743a5 PNA |
1174 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1175 | const struct nlattr *nla, | |
96518518 PM |
1176 | struct nft_expr_info *info) |
1177 | { | |
ef1f7df9 | 1178 | const struct nft_expr_type *type; |
96518518 | 1179 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1180 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1181 | int err; |
1182 | ||
ef1f7df9 | 1183 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
96518518 PM |
1184 | if (err < 0) |
1185 | return err; | |
1186 | ||
ef1f7df9 PM |
1187 | type = nft_expr_type_get(tb[NFTA_EXPR_NAME]); |
1188 | if (IS_ERR(type)) | |
1189 | return PTR_ERR(type); | |
1190 | ||
1191 | if (tb[NFTA_EXPR_DATA]) { | |
1192 | err = nla_parse_nested(info->tb, type->maxattr, | |
1193 | tb[NFTA_EXPR_DATA], type->policy); | |
1194 | if (err < 0) | |
1195 | goto err1; | |
1196 | } else | |
1197 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1198 | ||
1199 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1200 | ops = type->select_ops(ctx, |
1201 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1202 | if (IS_ERR(ops)) { |
1203 | err = PTR_ERR(ops); | |
1204 | goto err1; | |
1205 | } | |
1206 | } else | |
1207 | ops = type->ops; | |
1208 | ||
96518518 PM |
1209 | info->ops = ops; |
1210 | return 0; | |
ef1f7df9 PM |
1211 | |
1212 | err1: | |
1213 | module_put(type->owner); | |
1214 | return err; | |
96518518 PM |
1215 | } |
1216 | ||
1217 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1218 | const struct nft_expr_info *info, |
96518518 PM |
1219 | struct nft_expr *expr) |
1220 | { | |
1221 | const struct nft_expr_ops *ops = info->ops; | |
1222 | int err; | |
1223 | ||
1224 | expr->ops = ops; | |
1225 | if (ops->init) { | |
ef1f7df9 | 1226 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1227 | if (err < 0) |
1228 | goto err1; | |
1229 | } | |
1230 | ||
96518518 PM |
1231 | return 0; |
1232 | ||
1233 | err1: | |
1234 | expr->ops = NULL; | |
1235 | return err; | |
1236 | } | |
1237 | ||
1238 | static void nf_tables_expr_destroy(struct nft_expr *expr) | |
1239 | { | |
1240 | if (expr->ops->destroy) | |
1241 | expr->ops->destroy(expr); | |
ef1f7df9 | 1242 | module_put(expr->ops->type->owner); |
96518518 PM |
1243 | } |
1244 | ||
1245 | /* | |
1246 | * Rules | |
1247 | */ | |
1248 | ||
1249 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1250 | u64 handle) | |
1251 | { | |
1252 | struct nft_rule *rule; | |
1253 | ||
1254 | // FIXME: this sucks | |
1255 | list_for_each_entry(rule, &chain->rules, list) { | |
1256 | if (handle == rule->handle) | |
1257 | return rule; | |
1258 | } | |
1259 | ||
1260 | return ERR_PTR(-ENOENT); | |
1261 | } | |
1262 | ||
1263 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1264 | const struct nlattr *nla) | |
1265 | { | |
1266 | if (nla == NULL) | |
1267 | return ERR_PTR(-EINVAL); | |
1268 | ||
1269 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1270 | } | |
1271 | ||
1272 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
1273 | [NFTA_RULE_TABLE] = { .type = NLA_STRING }, | |
1274 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, | |
1275 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1276 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1277 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1278 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1279 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
96518518 PM |
1280 | }; |
1281 | ||
1282 | static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq, | |
1283 | int event, u32 flags, int family, | |
1284 | const struct nft_table *table, | |
1285 | const struct nft_chain *chain, | |
1286 | const struct nft_rule *rule) | |
1287 | { | |
1288 | struct nlmsghdr *nlh; | |
1289 | struct nfgenmsg *nfmsg; | |
1290 | const struct nft_expr *expr, *next; | |
1291 | struct nlattr *list; | |
5e948466 EL |
1292 | const struct nft_rule *prule; |
1293 | int type = event | NFNL_SUBSYS_NFTABLES << 8; | |
96518518 | 1294 | |
5e948466 | 1295 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
96518518 PM |
1296 | flags); |
1297 | if (nlh == NULL) | |
1298 | goto nla_put_failure; | |
1299 | ||
1300 | nfmsg = nlmsg_data(nlh); | |
1301 | nfmsg->nfgen_family = family; | |
1302 | nfmsg->version = NFNETLINK_V0; | |
1303 | nfmsg->res_id = 0; | |
1304 | ||
1305 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1306 | goto nla_put_failure; | |
1307 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1308 | goto nla_put_failure; | |
1309 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle))) | |
1310 | goto nla_put_failure; | |
1311 | ||
5e948466 EL |
1312 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
1313 | prule = list_entry(rule->list.prev, struct nft_rule, list); | |
1314 | if (nla_put_be64(skb, NFTA_RULE_POSITION, | |
1315 | cpu_to_be64(prule->handle))) | |
1316 | goto nla_put_failure; | |
1317 | } | |
1318 | ||
96518518 PM |
1319 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
1320 | if (list == NULL) | |
1321 | goto nla_put_failure; | |
1322 | nft_rule_for_each_expr(expr, next, rule) { | |
1323 | struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM); | |
1324 | if (elem == NULL) | |
1325 | goto nla_put_failure; | |
1326 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1327 | goto nla_put_failure; | |
1328 | nla_nest_end(skb, elem); | |
1329 | } | |
1330 | nla_nest_end(skb, list); | |
1331 | ||
1332 | return nlmsg_end(skb, nlh); | |
1333 | ||
1334 | nla_put_failure: | |
1335 | nlmsg_trim(skb, nlh); | |
1336 | return -1; | |
1337 | } | |
1338 | ||
1339 | static int nf_tables_rule_notify(const struct sk_buff *oskb, | |
1340 | const struct nlmsghdr *nlh, | |
1341 | const struct nft_table *table, | |
1342 | const struct nft_chain *chain, | |
1343 | const struct nft_rule *rule, | |
1344 | int event, u32 flags, int family) | |
1345 | { | |
1346 | struct sk_buff *skb; | |
1347 | u32 portid = NETLINK_CB(oskb).portid; | |
1348 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
1349 | u32 seq = nlh->nlmsg_seq; | |
1350 | bool report; | |
1351 | int err; | |
1352 | ||
1353 | report = nlmsg_report(nlh); | |
1354 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
1355 | return 0; | |
1356 | ||
1357 | err = -ENOBUFS; | |
1358 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1359 | if (skb == NULL) | |
1360 | goto err; | |
1361 | ||
1362 | err = nf_tables_fill_rule_info(skb, portid, seq, event, flags, | |
1363 | family, table, chain, rule); | |
1364 | if (err < 0) { | |
1365 | kfree_skb(skb); | |
1366 | goto err; | |
1367 | } | |
1368 | ||
1369 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
1370 | GFP_KERNEL); | |
1371 | err: | |
1372 | if (err < 0) | |
1373 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
1374 | return err; | |
1375 | } | |
1376 | ||
0628b123 PNA |
1377 | static inline bool |
1378 | nft_rule_is_active(struct net *net, const struct nft_rule *rule) | |
1379 | { | |
1380 | return (rule->genmask & (1 << net->nft.gencursor)) == 0; | |
1381 | } | |
1382 | ||
1383 | static inline int gencursor_next(struct net *net) | |
1384 | { | |
1385 | return net->nft.gencursor+1 == 1 ? 1 : 0; | |
1386 | } | |
1387 | ||
1388 | static inline int | |
1389 | nft_rule_is_active_next(struct net *net, const struct nft_rule *rule) | |
1390 | { | |
1391 | return (rule->genmask & (1 << gencursor_next(net))) == 0; | |
1392 | } | |
1393 | ||
1394 | static inline void | |
1395 | nft_rule_activate_next(struct net *net, struct nft_rule *rule) | |
1396 | { | |
1397 | /* Now inactive, will be active in the future */ | |
1398 | rule->genmask = (1 << net->nft.gencursor); | |
1399 | } | |
1400 | ||
1401 | static inline void | |
1402 | nft_rule_disactivate_next(struct net *net, struct nft_rule *rule) | |
1403 | { | |
1404 | rule->genmask = (1 << gencursor_next(net)); | |
1405 | } | |
1406 | ||
1407 | static inline void nft_rule_clear(struct net *net, struct nft_rule *rule) | |
1408 | { | |
1409 | rule->genmask = 0; | |
1410 | } | |
1411 | ||
96518518 PM |
1412 | static int nf_tables_dump_rules(struct sk_buff *skb, |
1413 | struct netlink_callback *cb) | |
1414 | { | |
1415 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1416 | const struct nft_af_info *afi; | |
1417 | const struct nft_table *table; | |
1418 | const struct nft_chain *chain; | |
1419 | const struct nft_rule *rule; | |
1420 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1421 | struct net *net = sock_net(skb->sk); |
96518518 | 1422 | int family = nfmsg->nfgen_family; |
0628b123 PNA |
1423 | u8 genctr = ACCESS_ONCE(net->nft.genctr); |
1424 | u8 gencursor = ACCESS_ONCE(net->nft.gencursor); | |
96518518 | 1425 | |
99633ab2 | 1426 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
1427 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1428 | continue; | |
1429 | ||
1430 | list_for_each_entry(table, &afi->tables, list) { | |
1431 | list_for_each_entry(chain, &table->chains, list) { | |
1432 | list_for_each_entry(rule, &chain->rules, list) { | |
0628b123 PNA |
1433 | if (!nft_rule_is_active(net, rule)) |
1434 | goto cont; | |
96518518 PM |
1435 | if (idx < s_idx) |
1436 | goto cont; | |
1437 | if (idx > s_idx) | |
1438 | memset(&cb->args[1], 0, | |
1439 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1440 | if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid, | |
1441 | cb->nlh->nlmsg_seq, | |
1442 | NFT_MSG_NEWRULE, | |
1443 | NLM_F_MULTI | NLM_F_APPEND, | |
1444 | afi->family, table, chain, rule) < 0) | |
1445 | goto done; | |
1446 | cont: | |
1447 | idx++; | |
1448 | } | |
1449 | } | |
1450 | } | |
1451 | } | |
1452 | done: | |
0628b123 PNA |
1453 | /* Invalidate this dump, a transition to the new generation happened */ |
1454 | if (gencursor != net->nft.gencursor || genctr != net->nft.genctr) | |
1455 | return -EBUSY; | |
1456 | ||
96518518 PM |
1457 | cb->args[0] = idx; |
1458 | return skb->len; | |
1459 | } | |
1460 | ||
1461 | static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb, | |
1462 | const struct nlmsghdr *nlh, | |
1463 | const struct nlattr * const nla[]) | |
1464 | { | |
1465 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1466 | const struct nft_af_info *afi; | |
1467 | const struct nft_table *table; | |
1468 | const struct nft_chain *chain; | |
1469 | const struct nft_rule *rule; | |
1470 | struct sk_buff *skb2; | |
99633ab2 | 1471 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1472 | int family = nfmsg->nfgen_family; |
1473 | int err; | |
1474 | ||
1475 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1476 | struct netlink_dump_control c = { | |
1477 | .dump = nf_tables_dump_rules, | |
1478 | }; | |
1479 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1480 | } | |
1481 | ||
99633ab2 | 1482 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1483 | if (IS_ERR(afi)) |
1484 | return PTR_ERR(afi); | |
1485 | ||
9370761c | 1486 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1487 | if (IS_ERR(table)) |
1488 | return PTR_ERR(table); | |
1489 | ||
1490 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1491 | if (IS_ERR(chain)) | |
1492 | return PTR_ERR(chain); | |
1493 | ||
1494 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
1495 | if (IS_ERR(rule)) | |
1496 | return PTR_ERR(rule); | |
1497 | ||
1498 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1499 | if (!skb2) | |
1500 | return -ENOMEM; | |
1501 | ||
1502 | err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid, | |
1503 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, | |
1504 | family, table, chain, rule); | |
1505 | if (err < 0) | |
1506 | goto err; | |
1507 | ||
1508 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1509 | ||
1510 | err: | |
1511 | kfree_skb(skb2); | |
1512 | return err; | |
1513 | } | |
1514 | ||
1515 | static void nf_tables_rcu_rule_destroy(struct rcu_head *head) | |
1516 | { | |
1517 | struct nft_rule *rule = container_of(head, struct nft_rule, rcu_head); | |
1518 | struct nft_expr *expr; | |
1519 | ||
1520 | /* | |
1521 | * Careful: some expressions might not be initialized in case this | |
1522 | * is called on error from nf_tables_newrule(). | |
1523 | */ | |
1524 | expr = nft_expr_first(rule); | |
1525 | while (expr->ops && expr != nft_expr_last(rule)) { | |
1526 | nf_tables_expr_destroy(expr); | |
1527 | expr = nft_expr_next(expr); | |
1528 | } | |
1529 | kfree(rule); | |
1530 | } | |
1531 | ||
1532 | static void nf_tables_rule_destroy(struct nft_rule *rule) | |
1533 | { | |
1534 | call_rcu(&rule->rcu_head, nf_tables_rcu_rule_destroy); | |
1535 | } | |
1536 | ||
1537 | #define NFT_RULE_MAXEXPRS 128 | |
1538 | ||
1539 | static struct nft_expr_info *info; | |
1540 | ||
0628b123 PNA |
1541 | static struct nft_rule_trans * |
1542 | nf_tables_trans_add(struct nft_rule *rule, const struct nft_ctx *ctx) | |
1543 | { | |
1544 | struct nft_rule_trans *rupd; | |
1545 | ||
1546 | rupd = kmalloc(sizeof(struct nft_rule_trans), GFP_KERNEL); | |
1547 | if (rupd == NULL) | |
1548 | return NULL; | |
1549 | ||
1550 | rupd->chain = ctx->chain; | |
1551 | rupd->table = ctx->table; | |
1552 | rupd->rule = rule; | |
1553 | rupd->family = ctx->afi->family; | |
1554 | rupd->nlh = ctx->nlh; | |
1555 | list_add_tail(&rupd->list, &ctx->net->nft.commit_list); | |
1556 | ||
1557 | return rupd; | |
1558 | } | |
1559 | ||
96518518 PM |
1560 | static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, |
1561 | const struct nlmsghdr *nlh, | |
1562 | const struct nlattr * const nla[]) | |
1563 | { | |
1564 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1565 | const struct nft_af_info *afi; | |
99633ab2 | 1566 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1567 | struct nft_table *table; |
1568 | struct nft_chain *chain; | |
1569 | struct nft_rule *rule, *old_rule = NULL; | |
0628b123 | 1570 | struct nft_rule_trans *repl = NULL; |
96518518 PM |
1571 | struct nft_expr *expr; |
1572 | struct nft_ctx ctx; | |
1573 | struct nlattr *tmp; | |
1574 | unsigned int size, i, n; | |
1575 | int err, rem; | |
1576 | bool create; | |
5e948466 | 1577 | u64 handle, pos_handle; |
96518518 PM |
1578 | |
1579 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1580 | ||
99633ab2 | 1581 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
1582 | if (IS_ERR(afi)) |
1583 | return PTR_ERR(afi); | |
1584 | ||
9370761c | 1585 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1586 | if (IS_ERR(table)) |
1587 | return PTR_ERR(table); | |
1588 | ||
1589 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1590 | if (IS_ERR(chain)) | |
1591 | return PTR_ERR(chain); | |
1592 | ||
1593 | if (nla[NFTA_RULE_HANDLE]) { | |
1594 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
1595 | rule = __nf_tables_rule_lookup(chain, handle); | |
1596 | if (IS_ERR(rule)) | |
1597 | return PTR_ERR(rule); | |
1598 | ||
1599 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1600 | return -EEXIST; | |
1601 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1602 | old_rule = rule; | |
1603 | else | |
1604 | return -EOPNOTSUPP; | |
1605 | } else { | |
1606 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
1607 | return -EINVAL; | |
1608 | handle = nf_tables_alloc_handle(table); | |
1609 | } | |
1610 | ||
5e948466 EL |
1611 | if (nla[NFTA_RULE_POSITION]) { |
1612 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
1613 | return -EOPNOTSUPP; | |
1614 | ||
1615 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
1616 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
1617 | if (IS_ERR(old_rule)) | |
1618 | return PTR_ERR(old_rule); | |
1619 | } | |
1620 | ||
0ca743a5 PNA |
1621 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1622 | ||
96518518 PM |
1623 | n = 0; |
1624 | size = 0; | |
1625 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
1626 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
1627 | err = -EINVAL; | |
1628 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
1629 | goto err1; | |
1630 | if (n == NFT_RULE_MAXEXPRS) | |
1631 | goto err1; | |
0ca743a5 | 1632 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
1633 | if (err < 0) |
1634 | goto err1; | |
1635 | size += info[n].ops->size; | |
1636 | n++; | |
1637 | } | |
1638 | } | |
1639 | ||
1640 | err = -ENOMEM; | |
1641 | rule = kzalloc(sizeof(*rule) + size, GFP_KERNEL); | |
1642 | if (rule == NULL) | |
1643 | goto err1; | |
1644 | ||
0628b123 PNA |
1645 | nft_rule_activate_next(net, rule); |
1646 | ||
96518518 PM |
1647 | rule->handle = handle; |
1648 | rule->dlen = size; | |
1649 | ||
96518518 PM |
1650 | expr = nft_expr_first(rule); |
1651 | for (i = 0; i < n; i++) { | |
1652 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
1653 | if (err < 0) | |
1654 | goto err2; | |
ef1f7df9 | 1655 | info[i].ops = NULL; |
96518518 PM |
1656 | expr = nft_expr_next(expr); |
1657 | } | |
1658 | ||
96518518 | 1659 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
0628b123 PNA |
1660 | if (nft_rule_is_active_next(net, old_rule)) { |
1661 | repl = nf_tables_trans_add(old_rule, &ctx); | |
1662 | if (repl == NULL) { | |
1663 | err = -ENOMEM; | |
1664 | goto err2; | |
1665 | } | |
1666 | nft_rule_disactivate_next(net, old_rule); | |
1667 | list_add_tail(&rule->list, &old_rule->list); | |
1668 | } else { | |
1669 | err = -ENOENT; | |
1670 | goto err2; | |
1671 | } | |
96518518 | 1672 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
1673 | if (old_rule) |
1674 | list_add_rcu(&rule->list, &old_rule->list); | |
1675 | else | |
1676 | list_add_tail_rcu(&rule->list, &chain->rules); | |
1677 | else { | |
1678 | if (old_rule) | |
1679 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
1680 | else | |
1681 | list_add_rcu(&rule->list, &chain->rules); | |
1682 | } | |
96518518 | 1683 | |
0628b123 PNA |
1684 | if (nf_tables_trans_add(rule, &ctx) == NULL) { |
1685 | err = -ENOMEM; | |
1686 | goto err3; | |
1687 | } | |
96518518 PM |
1688 | return 0; |
1689 | ||
0628b123 PNA |
1690 | err3: |
1691 | list_del_rcu(&rule->list); | |
1692 | if (repl) { | |
1693 | list_del_rcu(&repl->rule->list); | |
1694 | list_del(&repl->list); | |
1695 | nft_rule_clear(net, repl->rule); | |
1696 | kfree(repl); | |
1697 | } | |
96518518 PM |
1698 | err2: |
1699 | nf_tables_rule_destroy(rule); | |
1700 | err1: | |
1701 | for (i = 0; i < n; i++) { | |
1702 | if (info[i].ops != NULL) | |
ef1f7df9 | 1703 | module_put(info[i].ops->type->owner); |
96518518 PM |
1704 | } |
1705 | return err; | |
1706 | } | |
1707 | ||
0628b123 PNA |
1708 | static int |
1709 | nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule) | |
1710 | { | |
1711 | /* You cannot delete the same rule twice */ | |
1712 | if (nft_rule_is_active_next(ctx->net, rule)) { | |
1713 | if (nf_tables_trans_add(rule, ctx) == NULL) | |
1714 | return -ENOMEM; | |
1715 | nft_rule_disactivate_next(ctx->net, rule); | |
1716 | return 0; | |
1717 | } | |
1718 | return -ENOENT; | |
1719 | } | |
1720 | ||
cf9dc09d PNA |
1721 | static int nf_table_delrule_by_chain(struct nft_ctx *ctx) |
1722 | { | |
1723 | struct nft_rule *rule; | |
1724 | int err; | |
1725 | ||
1726 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
1727 | err = nf_tables_delrule_one(ctx, rule); | |
1728 | if (err < 0) | |
1729 | return err; | |
1730 | } | |
1731 | return 0; | |
1732 | } | |
1733 | ||
96518518 PM |
1734 | static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb, |
1735 | const struct nlmsghdr *nlh, | |
1736 | const struct nlattr * const nla[]) | |
1737 | { | |
1738 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1739 | const struct nft_af_info *afi; | |
99633ab2 | 1740 | struct net *net = sock_net(skb->sk); |
96518518 | 1741 | const struct nft_table *table; |
cf9dc09d PNA |
1742 | struct nft_chain *chain = NULL; |
1743 | struct nft_rule *rule; | |
0628b123 PNA |
1744 | int family = nfmsg->nfgen_family, err = 0; |
1745 | struct nft_ctx ctx; | |
96518518 | 1746 | |
99633ab2 | 1747 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1748 | if (IS_ERR(afi)) |
1749 | return PTR_ERR(afi); | |
1750 | ||
9370761c | 1751 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1752 | if (IS_ERR(table)) |
1753 | return PTR_ERR(table); | |
1754 | ||
cf9dc09d PNA |
1755 | if (nla[NFTA_RULE_CHAIN]) { |
1756 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1757 | if (IS_ERR(chain)) | |
1758 | return PTR_ERR(chain); | |
1759 | } | |
96518518 | 1760 | |
0628b123 PNA |
1761 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1762 | ||
cf9dc09d PNA |
1763 | if (chain) { |
1764 | if (nla[NFTA_RULE_HANDLE]) { | |
1765 | rule = nf_tables_rule_lookup(chain, | |
1766 | nla[NFTA_RULE_HANDLE]); | |
1767 | if (IS_ERR(rule)) | |
1768 | return PTR_ERR(rule); | |
96518518 | 1769 | |
0628b123 | 1770 | err = nf_tables_delrule_one(&ctx, rule); |
cf9dc09d PNA |
1771 | } else { |
1772 | err = nf_table_delrule_by_chain(&ctx); | |
1773 | } | |
1774 | } else { | |
1775 | list_for_each_entry(chain, &table->chains, list) { | |
1776 | ctx.chain = chain; | |
1777 | err = nf_table_delrule_by_chain(&ctx); | |
0628b123 PNA |
1778 | if (err < 0) |
1779 | break; | |
1780 | } | |
1781 | } | |
1782 | ||
1783 | return err; | |
1784 | } | |
1785 | ||
1786 | static int nf_tables_commit(struct sk_buff *skb) | |
1787 | { | |
1788 | struct net *net = sock_net(skb->sk); | |
1789 | struct nft_rule_trans *rupd, *tmp; | |
96518518 | 1790 | |
0628b123 PNA |
1791 | /* Bump generation counter, invalidate any dump in progress */ |
1792 | net->nft.genctr++; | |
1793 | ||
1794 | /* A new generation has just started */ | |
1795 | net->nft.gencursor = gencursor_next(net); | |
1796 | ||
1797 | /* Make sure all packets have left the previous generation before | |
1798 | * purging old rules. | |
1799 | */ | |
1800 | synchronize_rcu(); | |
1801 | ||
1802 | list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { | |
1803 | /* Delete this rule from the dirty list */ | |
1804 | list_del(&rupd->list); | |
1805 | ||
1806 | /* This rule was inactive in the past and just became active. | |
1807 | * Clear the next bit of the genmask since its meaning has | |
1808 | * changed, now it is the future. | |
1809 | */ | |
1810 | if (nft_rule_is_active(net, rupd->rule)) { | |
1811 | nft_rule_clear(net, rupd->rule); | |
1812 | nf_tables_rule_notify(skb, rupd->nlh, rupd->table, | |
1813 | rupd->chain, rupd->rule, | |
1814 | NFT_MSG_NEWRULE, 0, | |
1815 | rupd->family); | |
1816 | kfree(rupd); | |
1817 | continue; | |
96518518 | 1818 | } |
0628b123 PNA |
1819 | |
1820 | /* This rule is in the past, get rid of it */ | |
1821 | list_del_rcu(&rupd->rule->list); | |
1822 | nf_tables_rule_notify(skb, rupd->nlh, rupd->table, rupd->chain, | |
1823 | rupd->rule, NFT_MSG_DELRULE, 0, | |
1824 | rupd->family); | |
1825 | nf_tables_rule_destroy(rupd->rule); | |
1826 | kfree(rupd); | |
96518518 PM |
1827 | } |
1828 | ||
96518518 PM |
1829 | return 0; |
1830 | } | |
1831 | ||
0628b123 PNA |
1832 | static int nf_tables_abort(struct sk_buff *skb) |
1833 | { | |
1834 | struct net *net = sock_net(skb->sk); | |
1835 | struct nft_rule_trans *rupd, *tmp; | |
1836 | ||
1837 | list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { | |
1838 | /* Delete all rules from the dirty list */ | |
1839 | list_del(&rupd->list); | |
1840 | ||
1841 | if (!nft_rule_is_active_next(net, rupd->rule)) { | |
1842 | nft_rule_clear(net, rupd->rule); | |
1843 | kfree(rupd); | |
1844 | continue; | |
1845 | } | |
1846 | ||
1847 | /* This rule is inactive, get rid of it */ | |
1848 | list_del_rcu(&rupd->rule->list); | |
1849 | nf_tables_rule_destroy(rupd->rule); | |
1850 | kfree(rupd); | |
1851 | } | |
1852 | return 0; | |
1853 | } | |
1854 | ||
20a69341 PM |
1855 | /* |
1856 | * Sets | |
1857 | */ | |
1858 | ||
1859 | static LIST_HEAD(nf_tables_set_ops); | |
1860 | ||
1861 | int nft_register_set(struct nft_set_ops *ops) | |
1862 | { | |
1863 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1864 | list_add_tail(&ops->list, &nf_tables_set_ops); | |
1865 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1866 | return 0; | |
1867 | } | |
1868 | EXPORT_SYMBOL_GPL(nft_register_set); | |
1869 | ||
1870 | void nft_unregister_set(struct nft_set_ops *ops) | |
1871 | { | |
1872 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1873 | list_del(&ops->list); | |
1874 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1875 | } | |
1876 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
1877 | ||
1878 | static const struct nft_set_ops *nft_select_set_ops(const struct nlattr * const nla[]) | |
1879 | { | |
1880 | const struct nft_set_ops *ops; | |
1881 | u32 features; | |
1882 | ||
1883 | #ifdef CONFIG_MODULES | |
1884 | if (list_empty(&nf_tables_set_ops)) { | |
1885 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1886 | request_module("nft-set"); | |
1887 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1888 | if (!list_empty(&nf_tables_set_ops)) | |
1889 | return ERR_PTR(-EAGAIN); | |
1890 | } | |
1891 | #endif | |
1892 | features = 0; | |
1893 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
1894 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
1895 | features &= NFT_SET_INTERVAL | NFT_SET_MAP; | |
1896 | } | |
1897 | ||
1898 | // FIXME: implement selection properly | |
1899 | list_for_each_entry(ops, &nf_tables_set_ops, list) { | |
1900 | if ((ops->features & features) != features) | |
1901 | continue; | |
1902 | if (!try_module_get(ops->owner)) | |
1903 | continue; | |
1904 | return ops; | |
1905 | } | |
1906 | ||
1907 | return ERR_PTR(-EOPNOTSUPP); | |
1908 | } | |
1909 | ||
1910 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
1911 | [NFTA_SET_TABLE] = { .type = NLA_STRING }, | |
1912 | [NFTA_SET_NAME] = { .type = NLA_STRING }, | |
1913 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, | |
1914 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
1915 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
1916 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
1917 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
1918 | }; | |
1919 | ||
1920 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, | |
1921 | const struct sk_buff *skb, | |
1922 | const struct nlmsghdr *nlh, | |
1923 | const struct nlattr * const nla[]) | |
1924 | { | |
99633ab2 | 1925 | struct net *net = sock_net(skb->sk); |
20a69341 | 1926 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
c9c8e485 | 1927 | const struct nft_af_info *afi = NULL; |
20a69341 PM |
1928 | const struct nft_table *table = NULL; |
1929 | ||
c9c8e485 PNA |
1930 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
1931 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
1932 | if (IS_ERR(afi)) | |
1933 | return PTR_ERR(afi); | |
1934 | } | |
20a69341 PM |
1935 | |
1936 | if (nla[NFTA_SET_TABLE] != NULL) { | |
9370761c | 1937 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
1938 | if (IS_ERR(table)) |
1939 | return PTR_ERR(table); | |
1940 | } | |
1941 | ||
0ca743a5 | 1942 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
1943 | return 0; |
1944 | } | |
1945 | ||
1946 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, | |
1947 | const struct nlattr *nla) | |
1948 | { | |
1949 | struct nft_set *set; | |
1950 | ||
1951 | if (nla == NULL) | |
1952 | return ERR_PTR(-EINVAL); | |
1953 | ||
1954 | list_for_each_entry(set, &table->sets, list) { | |
1955 | if (!nla_strcmp(nla, set->name)) | |
1956 | return set; | |
1957 | } | |
1958 | return ERR_PTR(-ENOENT); | |
1959 | } | |
1960 | ||
1961 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, | |
1962 | const char *name) | |
1963 | { | |
1964 | const struct nft_set *i; | |
1965 | const char *p; | |
1966 | unsigned long *inuse; | |
1967 | unsigned int n = 0; | |
1968 | ||
1969 | p = strnchr(name, IFNAMSIZ, '%'); | |
1970 | if (p != NULL) { | |
1971 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
1972 | return -EINVAL; | |
1973 | ||
1974 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
1975 | if (inuse == NULL) | |
1976 | return -ENOMEM; | |
1977 | ||
1978 | list_for_each_entry(i, &ctx->table->sets, list) { | |
14662917 DB |
1979 | int tmp; |
1980 | ||
1981 | if (!sscanf(i->name, name, &tmp)) | |
20a69341 | 1982 | continue; |
14662917 | 1983 | if (tmp < 0 || tmp > BITS_PER_LONG * PAGE_SIZE) |
20a69341 | 1984 | continue; |
14662917 DB |
1985 | |
1986 | set_bit(tmp, inuse); | |
20a69341 PM |
1987 | } |
1988 | ||
1989 | n = find_first_zero_bit(inuse, BITS_PER_LONG * PAGE_SIZE); | |
1990 | free_page((unsigned long)inuse); | |
1991 | } | |
1992 | ||
1993 | snprintf(set->name, sizeof(set->name), name, n); | |
1994 | list_for_each_entry(i, &ctx->table->sets, list) { | |
1995 | if (!strcmp(set->name, i->name)) | |
1996 | return -ENFILE; | |
1997 | } | |
1998 | return 0; | |
1999 | } | |
2000 | ||
2001 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2002 | const struct nft_set *set, u16 event, u16 flags) | |
2003 | { | |
2004 | struct nfgenmsg *nfmsg; | |
2005 | struct nlmsghdr *nlh; | |
2006 | u32 portid = NETLINK_CB(ctx->skb).portid; | |
2007 | u32 seq = ctx->nlh->nlmsg_seq; | |
2008 | ||
2009 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2010 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2011 | flags); | |
2012 | if (nlh == NULL) | |
2013 | goto nla_put_failure; | |
2014 | ||
2015 | nfmsg = nlmsg_data(nlh); | |
2016 | nfmsg->nfgen_family = ctx->afi->family; | |
2017 | nfmsg->version = NFNETLINK_V0; | |
2018 | nfmsg->res_id = 0; | |
2019 | ||
2020 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2021 | goto nla_put_failure; | |
2022 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2023 | goto nla_put_failure; | |
2024 | if (set->flags != 0) | |
2025 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2026 | goto nla_put_failure; | |
2027 | ||
2028 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2029 | goto nla_put_failure; | |
2030 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2031 | goto nla_put_failure; | |
2032 | if (set->flags & NFT_SET_MAP) { | |
2033 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2034 | goto nla_put_failure; | |
2035 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2036 | goto nla_put_failure; | |
2037 | } | |
2038 | ||
2039 | return nlmsg_end(skb, nlh); | |
2040 | ||
2041 | nla_put_failure: | |
2042 | nlmsg_trim(skb, nlh); | |
2043 | return -1; | |
2044 | } | |
2045 | ||
2046 | static int nf_tables_set_notify(const struct nft_ctx *ctx, | |
2047 | const struct nft_set *set, | |
2048 | int event) | |
2049 | { | |
2050 | struct sk_buff *skb; | |
2051 | u32 portid = NETLINK_CB(ctx->skb).portid; | |
20a69341 PM |
2052 | bool report; |
2053 | int err; | |
2054 | ||
2055 | report = nlmsg_report(ctx->nlh); | |
99633ab2 | 2056 | if (!report && !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
20a69341 PM |
2057 | return 0; |
2058 | ||
2059 | err = -ENOBUFS; | |
2060 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2061 | if (skb == NULL) | |
2062 | goto err; | |
2063 | ||
2064 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2065 | if (err < 0) { | |
2066 | kfree_skb(skb); | |
2067 | goto err; | |
2068 | } | |
2069 | ||
99633ab2 | 2070 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, report, |
20a69341 PM |
2071 | GFP_KERNEL); |
2072 | err: | |
2073 | if (err < 0) | |
99633ab2 | 2074 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
20a69341 PM |
2075 | return err; |
2076 | } | |
2077 | ||
2078 | static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb, | |
2079 | struct netlink_callback *cb) | |
2080 | { | |
2081 | const struct nft_set *set; | |
2082 | unsigned int idx = 0, s_idx = cb->args[0]; | |
2083 | ||
2084 | if (cb->args[1]) | |
2085 | return skb->len; | |
2086 | ||
2087 | list_for_each_entry(set, &ctx->table->sets, list) { | |
2088 | if (idx < s_idx) | |
2089 | goto cont; | |
2090 | if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, | |
2091 | NLM_F_MULTI) < 0) { | |
2092 | cb->args[0] = idx; | |
2093 | goto done; | |
2094 | } | |
2095 | cont: | |
2096 | idx++; | |
2097 | } | |
2098 | cb->args[1] = 1; | |
2099 | done: | |
2100 | return skb->len; | |
2101 | } | |
2102 | ||
c9c8e485 PNA |
2103 | static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb, |
2104 | struct netlink_callback *cb) | |
20a69341 PM |
2105 | { |
2106 | const struct nft_set *set; | |
e38195bf | 2107 | unsigned int idx, s_idx = cb->args[0]; |
20a69341 PM |
2108 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2109 | ||
2110 | if (cb->args[1]) | |
2111 | return skb->len; | |
2112 | ||
2113 | list_for_each_entry(table, &ctx->afi->tables, list) { | |
e38195bf PNA |
2114 | if (cur_table) { |
2115 | if (cur_table != table) | |
2116 | continue; | |
20a69341 | 2117 | |
e38195bf PNA |
2118 | cur_table = NULL; |
2119 | } | |
20a69341 | 2120 | ctx->table = table; |
e38195bf | 2121 | idx = 0; |
20a69341 PM |
2122 | list_for_each_entry(set, &ctx->table->sets, list) { |
2123 | if (idx < s_idx) | |
2124 | goto cont; | |
2125 | if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, | |
2126 | NLM_F_MULTI) < 0) { | |
2127 | cb->args[0] = idx; | |
2128 | cb->args[2] = (unsigned long) table; | |
2129 | goto done; | |
2130 | } | |
2131 | cont: | |
2132 | idx++; | |
2133 | } | |
2134 | } | |
2135 | cb->args[1] = 1; | |
2136 | done: | |
2137 | return skb->len; | |
2138 | } | |
2139 | ||
c9c8e485 PNA |
2140 | static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb, |
2141 | struct netlink_callback *cb) | |
2142 | { | |
2143 | const struct nft_set *set; | |
2144 | unsigned int idx, s_idx = cb->args[0]; | |
2145 | const struct nft_af_info *afi; | |
2146 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; | |
2147 | struct net *net = sock_net(skb->sk); | |
2148 | int cur_family = cb->args[3]; | |
2149 | ||
2150 | if (cb->args[1]) | |
2151 | return skb->len; | |
2152 | ||
2153 | list_for_each_entry(afi, &net->nft.af_info, list) { | |
2154 | if (cur_family) { | |
2155 | if (afi->family != cur_family) | |
2156 | continue; | |
2157 | ||
2158 | cur_family = 0; | |
2159 | } | |
2160 | ||
2161 | list_for_each_entry(table, &afi->tables, list) { | |
2162 | if (cur_table) { | |
2163 | if (cur_table != table) | |
2164 | continue; | |
2165 | ||
2166 | cur_table = NULL; | |
2167 | } | |
2168 | ||
2169 | ctx->table = table; | |
2170 | ctx->afi = afi; | |
2171 | idx = 0; | |
2172 | list_for_each_entry(set, &ctx->table->sets, list) { | |
2173 | if (idx < s_idx) | |
2174 | goto cont; | |
2175 | if (nf_tables_fill_set(skb, ctx, set, | |
2176 | NFT_MSG_NEWSET, | |
2177 | NLM_F_MULTI) < 0) { | |
2178 | cb->args[0] = idx; | |
2179 | cb->args[2] = (unsigned long) table; | |
2180 | cb->args[3] = afi->family; | |
2181 | goto done; | |
2182 | } | |
2183 | cont: | |
2184 | idx++; | |
2185 | } | |
2186 | if (s_idx) | |
2187 | s_idx = 0; | |
2188 | } | |
2189 | } | |
2190 | cb->args[1] = 1; | |
2191 | done: | |
2192 | return skb->len; | |
2193 | } | |
2194 | ||
20a69341 PM |
2195 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
2196 | { | |
2197 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
2198 | struct nlattr *nla[NFTA_SET_MAX + 1]; | |
2199 | struct nft_ctx ctx; | |
2200 | int err, ret; | |
2201 | ||
2202 | err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX, | |
2203 | nft_set_policy); | |
2204 | if (err < 0) | |
2205 | return err; | |
2206 | ||
2207 | err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla); | |
2208 | if (err < 0) | |
2209 | return err; | |
2210 | ||
c9c8e485 PNA |
2211 | if (ctx.table == NULL) { |
2212 | if (ctx.afi == NULL) | |
2213 | ret = nf_tables_dump_sets_all(&ctx, skb, cb); | |
2214 | else | |
2215 | ret = nf_tables_dump_sets_family(&ctx, skb, cb); | |
2216 | } else | |
20a69341 PM |
2217 | ret = nf_tables_dump_sets_table(&ctx, skb, cb); |
2218 | ||
2219 | return ret; | |
2220 | } | |
2221 | ||
2222 | static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb, | |
2223 | const struct nlmsghdr *nlh, | |
2224 | const struct nlattr * const nla[]) | |
2225 | { | |
2226 | const struct nft_set *set; | |
2227 | struct nft_ctx ctx; | |
2228 | struct sk_buff *skb2; | |
c9c8e485 | 2229 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2230 | int err; |
2231 | ||
2232 | /* Verify existance before starting dump */ | |
2233 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); | |
2234 | if (err < 0) | |
2235 | return err; | |
2236 | ||
2237 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2238 | struct netlink_dump_control c = { | |
2239 | .dump = nf_tables_dump_sets, | |
2240 | }; | |
2241 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
2242 | } | |
2243 | ||
c9c8e485 PNA |
2244 | /* Only accept unspec with dump */ |
2245 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2246 | return -EAFNOSUPPORT; | |
2247 | ||
20a69341 PM |
2248 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
2249 | if (IS_ERR(set)) | |
2250 | return PTR_ERR(set); | |
2251 | ||
2252 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2253 | if (skb2 == NULL) | |
2254 | return -ENOMEM; | |
2255 | ||
2256 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2257 | if (err < 0) | |
2258 | goto err; | |
2259 | ||
2260 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2261 | ||
2262 | err: | |
2263 | kfree_skb(skb2); | |
2264 | return err; | |
2265 | } | |
2266 | ||
2267 | static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb, | |
2268 | const struct nlmsghdr *nlh, | |
2269 | const struct nlattr * const nla[]) | |
2270 | { | |
2271 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
2272 | const struct nft_set_ops *ops; | |
2273 | const struct nft_af_info *afi; | |
99633ab2 | 2274 | struct net *net = sock_net(skb->sk); |
20a69341 PM |
2275 | struct nft_table *table; |
2276 | struct nft_set *set; | |
2277 | struct nft_ctx ctx; | |
2278 | char name[IFNAMSIZ]; | |
2279 | unsigned int size; | |
2280 | bool create; | |
2281 | u32 ktype, klen, dlen, dtype, flags; | |
2282 | int err; | |
2283 | ||
2284 | if (nla[NFTA_SET_TABLE] == NULL || | |
2285 | nla[NFTA_SET_NAME] == NULL || | |
2286 | nla[NFTA_SET_KEY_LEN] == NULL) | |
2287 | return -EINVAL; | |
2288 | ||
2289 | ktype = NFT_DATA_VALUE; | |
2290 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
2291 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
2292 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
2293 | return -EINVAL; | |
2294 | } | |
2295 | ||
2296 | klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); | |
2297 | if (klen == 0 || klen > FIELD_SIZEOF(struct nft_data, data)) | |
2298 | return -EINVAL; | |
2299 | ||
2300 | flags = 0; | |
2301 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2302 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
2303 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
2304 | NFT_SET_INTERVAL | NFT_SET_MAP)) | |
2305 | return -EINVAL; | |
2306 | } | |
2307 | ||
2308 | dtype = 0; | |
2309 | dlen = 0; | |
2310 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { | |
2311 | if (!(flags & NFT_SET_MAP)) | |
2312 | return -EINVAL; | |
2313 | ||
2314 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
2315 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
2316 | dtype != NFT_DATA_VERDICT) | |
2317 | return -EINVAL; | |
2318 | ||
2319 | if (dtype != NFT_DATA_VERDICT) { | |
2320 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
2321 | return -EINVAL; | |
2322 | dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); | |
2323 | if (dlen == 0 || | |
2324 | dlen > FIELD_SIZEOF(struct nft_data, data)) | |
2325 | return -EINVAL; | |
2326 | } else | |
2327 | dlen = sizeof(struct nft_data); | |
2328 | } else if (flags & NFT_SET_MAP) | |
2329 | return -EINVAL; | |
2330 | ||
2331 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
2332 | ||
99633ab2 | 2333 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
2334 | if (IS_ERR(afi)) |
2335 | return PTR_ERR(afi); | |
2336 | ||
9370761c | 2337 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
2338 | if (IS_ERR(table)) |
2339 | return PTR_ERR(table); | |
2340 | ||
0ca743a5 | 2341 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2342 | |
2343 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); | |
2344 | if (IS_ERR(set)) { | |
2345 | if (PTR_ERR(set) != -ENOENT) | |
2346 | return PTR_ERR(set); | |
2347 | set = NULL; | |
2348 | } | |
2349 | ||
2350 | if (set != NULL) { | |
2351 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2352 | return -EEXIST; | |
2353 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2354 | return -EOPNOTSUPP; | |
2355 | return 0; | |
2356 | } | |
2357 | ||
2358 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2359 | return -ENOENT; | |
2360 | ||
2361 | ops = nft_select_set_ops(nla); | |
2362 | if (IS_ERR(ops)) | |
2363 | return PTR_ERR(ops); | |
2364 | ||
2365 | size = 0; | |
2366 | if (ops->privsize != NULL) | |
2367 | size = ops->privsize(nla); | |
2368 | ||
2369 | err = -ENOMEM; | |
2370 | set = kzalloc(sizeof(*set) + size, GFP_KERNEL); | |
2371 | if (set == NULL) | |
2372 | goto err1; | |
2373 | ||
2374 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); | |
2375 | err = nf_tables_set_alloc_name(&ctx, set, name); | |
2376 | if (err < 0) | |
2377 | goto err2; | |
2378 | ||
2379 | INIT_LIST_HEAD(&set->bindings); | |
2380 | set->ops = ops; | |
2381 | set->ktype = ktype; | |
2382 | set->klen = klen; | |
2383 | set->dtype = dtype; | |
2384 | set->dlen = dlen; | |
2385 | set->flags = flags; | |
2386 | ||
2387 | err = ops->init(set, nla); | |
2388 | if (err < 0) | |
2389 | goto err2; | |
2390 | ||
2391 | list_add_tail(&set->list, &table->sets); | |
2392 | nf_tables_set_notify(&ctx, set, NFT_MSG_NEWSET); | |
2393 | return 0; | |
2394 | ||
2395 | err2: | |
2396 | kfree(set); | |
2397 | err1: | |
2398 | module_put(ops->owner); | |
2399 | return err; | |
2400 | } | |
2401 | ||
2402 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) | |
2403 | { | |
2404 | list_del(&set->list); | |
2405 | if (!(set->flags & NFT_SET_ANONYMOUS)) | |
2406 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET); | |
2407 | ||
2408 | set->ops->destroy(set); | |
2409 | module_put(set->ops->owner); | |
2410 | kfree(set); | |
2411 | } | |
2412 | ||
2413 | static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb, | |
2414 | const struct nlmsghdr *nlh, | |
2415 | const struct nlattr * const nla[]) | |
2416 | { | |
c9c8e485 | 2417 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2418 | struct nft_set *set; |
2419 | struct nft_ctx ctx; | |
2420 | int err; | |
2421 | ||
2422 | if (nla[NFTA_SET_TABLE] == NULL) | |
2423 | return -EINVAL; | |
2424 | ||
2425 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); | |
2426 | if (err < 0) | |
2427 | return err; | |
2428 | ||
c9c8e485 PNA |
2429 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
2430 | return -EAFNOSUPPORT; | |
2431 | ||
20a69341 PM |
2432 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
2433 | if (IS_ERR(set)) | |
2434 | return PTR_ERR(set); | |
2435 | if (!list_empty(&set->bindings)) | |
2436 | return -EBUSY; | |
2437 | ||
2438 | nf_tables_set_destroy(&ctx, set); | |
2439 | return 0; | |
2440 | } | |
2441 | ||
2442 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
2443 | const struct nft_set *set, | |
2444 | const struct nft_set_iter *iter, | |
2445 | const struct nft_set_elem *elem) | |
2446 | { | |
2447 | enum nft_registers dreg; | |
2448 | ||
2449 | dreg = nft_type_to_reg(set->dtype); | |
2ee0d3c8 PNA |
2450 | return nft_validate_data_load(ctx, dreg, &elem->data, |
2451 | set->dtype == NFT_DATA_VERDICT ? | |
2452 | NFT_DATA_VERDICT : NFT_DATA_VALUE); | |
20a69341 PM |
2453 | } |
2454 | ||
2455 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2456 | struct nft_set_binding *binding) | |
2457 | { | |
2458 | struct nft_set_binding *i; | |
2459 | struct nft_set_iter iter; | |
2460 | ||
2461 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
2462 | return -EBUSY; | |
2463 | ||
2464 | if (set->flags & NFT_SET_MAP) { | |
2465 | /* If the set is already bound to the same chain all | |
2466 | * jumps are already validated for that chain. | |
2467 | */ | |
2468 | list_for_each_entry(i, &set->bindings, list) { | |
2469 | if (i->chain == binding->chain) | |
2470 | goto bind; | |
2471 | } | |
2472 | ||
2473 | iter.skip = 0; | |
2474 | iter.count = 0; | |
2475 | iter.err = 0; | |
2476 | iter.fn = nf_tables_bind_check_setelem; | |
2477 | ||
2478 | set->ops->walk(ctx, set, &iter); | |
2479 | if (iter.err < 0) { | |
2480 | /* Destroy anonymous sets if binding fails */ | |
2481 | if (set->flags & NFT_SET_ANONYMOUS) | |
2482 | nf_tables_set_destroy(ctx, set); | |
2483 | ||
2484 | return iter.err; | |
2485 | } | |
2486 | } | |
2487 | bind: | |
2488 | binding->chain = ctx->chain; | |
2489 | list_add_tail(&binding->list, &set->bindings); | |
2490 | return 0; | |
2491 | } | |
2492 | ||
2493 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2494 | struct nft_set_binding *binding) | |
2495 | { | |
2496 | list_del(&binding->list); | |
2497 | ||
2498 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
2499 | nf_tables_set_destroy(ctx, set); | |
2500 | } | |
2501 | ||
2502 | /* | |
2503 | * Set elements | |
2504 | */ | |
2505 | ||
2506 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
2507 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
2508 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
2509 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
2510 | }; | |
2511 | ||
2512 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
2513 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING }, | |
2514 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING }, | |
2515 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, | |
2516 | }; | |
2517 | ||
2518 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, | |
2519 | const struct sk_buff *skb, | |
2520 | const struct nlmsghdr *nlh, | |
2521 | const struct nlattr * const nla[]) | |
2522 | { | |
2523 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
2524 | const struct nft_af_info *afi; | |
2525 | const struct nft_table *table; | |
99633ab2 | 2526 | struct net *net = sock_net(skb->sk); |
20a69341 | 2527 | |
99633ab2 | 2528 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
2529 | if (IS_ERR(afi)) |
2530 | return PTR_ERR(afi); | |
2531 | ||
9370761c | 2532 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]); |
20a69341 PM |
2533 | if (IS_ERR(table)) |
2534 | return PTR_ERR(table); | |
2535 | ||
0ca743a5 | 2536 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2537 | return 0; |
2538 | } | |
2539 | ||
2540 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
2541 | const struct nft_set *set, | |
2542 | const struct nft_set_elem *elem) | |
2543 | { | |
2544 | unsigned char *b = skb_tail_pointer(skb); | |
2545 | struct nlattr *nest; | |
2546 | ||
2547 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
2548 | if (nest == NULL) | |
2549 | goto nla_put_failure; | |
2550 | ||
2551 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE, | |
2552 | set->klen) < 0) | |
2553 | goto nla_put_failure; | |
2554 | ||
2555 | if (set->flags & NFT_SET_MAP && | |
2556 | !(elem->flags & NFT_SET_ELEM_INTERVAL_END) && | |
2557 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data, | |
2558 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
2559 | set->dlen) < 0) | |
2560 | goto nla_put_failure; | |
2561 | ||
2562 | if (elem->flags != 0) | |
2563 | if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags))) | |
2564 | goto nla_put_failure; | |
2565 | ||
2566 | nla_nest_end(skb, nest); | |
2567 | return 0; | |
2568 | ||
2569 | nla_put_failure: | |
2570 | nlmsg_trim(skb, b); | |
2571 | return -EMSGSIZE; | |
2572 | } | |
2573 | ||
2574 | struct nft_set_dump_args { | |
2575 | const struct netlink_callback *cb; | |
2576 | struct nft_set_iter iter; | |
2577 | struct sk_buff *skb; | |
2578 | }; | |
2579 | ||
2580 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
2581 | const struct nft_set *set, | |
2582 | const struct nft_set_iter *iter, | |
2583 | const struct nft_set_elem *elem) | |
2584 | { | |
2585 | struct nft_set_dump_args *args; | |
2586 | ||
2587 | args = container_of(iter, struct nft_set_dump_args, iter); | |
2588 | return nf_tables_fill_setelem(args->skb, set, elem); | |
2589 | } | |
2590 | ||
2591 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) | |
2592 | { | |
2593 | const struct nft_set *set; | |
2594 | struct nft_set_dump_args args; | |
2595 | struct nft_ctx ctx; | |
2596 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; | |
2597 | struct nfgenmsg *nfmsg; | |
2598 | struct nlmsghdr *nlh; | |
2599 | struct nlattr *nest; | |
2600 | u32 portid, seq; | |
2601 | int event, err; | |
2602 | ||
720e0dfa MN |
2603 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
2604 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); | |
20a69341 PM |
2605 | if (err < 0) |
2606 | return err; | |
2607 | ||
2608 | err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla); | |
2609 | if (err < 0) | |
2610 | return err; | |
2611 | ||
2612 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2613 | if (IS_ERR(set)) | |
2614 | return PTR_ERR(set); | |
2615 | ||
2616 | event = NFT_MSG_NEWSETELEM; | |
2617 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2618 | portid = NETLINK_CB(cb->skb).portid; | |
2619 | seq = cb->nlh->nlmsg_seq; | |
2620 | ||
2621 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2622 | NLM_F_MULTI); | |
2623 | if (nlh == NULL) | |
2624 | goto nla_put_failure; | |
2625 | ||
2626 | nfmsg = nlmsg_data(nlh); | |
2627 | nfmsg->nfgen_family = NFPROTO_UNSPEC; | |
2628 | nfmsg->version = NFNETLINK_V0; | |
2629 | nfmsg->res_id = 0; | |
2630 | ||
2631 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) | |
2632 | goto nla_put_failure; | |
2633 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
2634 | goto nla_put_failure; | |
2635 | ||
2636 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
2637 | if (nest == NULL) | |
2638 | goto nla_put_failure; | |
2639 | ||
2640 | args.cb = cb; | |
2641 | args.skb = skb; | |
2642 | args.iter.skip = cb->args[0]; | |
2643 | args.iter.count = 0; | |
2644 | args.iter.err = 0; | |
2645 | args.iter.fn = nf_tables_dump_setelem; | |
2646 | set->ops->walk(&ctx, set, &args.iter); | |
2647 | ||
2648 | nla_nest_end(skb, nest); | |
2649 | nlmsg_end(skb, nlh); | |
2650 | ||
2651 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
2652 | return args.iter.err; | |
2653 | if (args.iter.count == cb->args[0]) | |
2654 | return 0; | |
2655 | ||
2656 | cb->args[0] = args.iter.count; | |
2657 | return skb->len; | |
2658 | ||
2659 | nla_put_failure: | |
2660 | return -ENOSPC; | |
2661 | } | |
2662 | ||
2663 | static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2664 | const struct nlmsghdr *nlh, | |
2665 | const struct nlattr * const nla[]) | |
2666 | { | |
2667 | const struct nft_set *set; | |
2668 | struct nft_ctx ctx; | |
2669 | int err; | |
2670 | ||
2671 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
2672 | if (err < 0) | |
2673 | return err; | |
2674 | ||
2675 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2676 | if (IS_ERR(set)) | |
2677 | return PTR_ERR(set); | |
2678 | ||
2679 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2680 | struct netlink_dump_control c = { | |
2681 | .dump = nf_tables_dump_set, | |
2682 | }; | |
2683 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
2684 | } | |
2685 | return -EOPNOTSUPP; | |
2686 | } | |
2687 | ||
2688 | static int nft_add_set_elem(const struct nft_ctx *ctx, struct nft_set *set, | |
2689 | const struct nlattr *attr) | |
2690 | { | |
2691 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
2692 | struct nft_data_desc d1, d2; | |
2693 | struct nft_set_elem elem; | |
2694 | struct nft_set_binding *binding; | |
2695 | enum nft_registers dreg; | |
2696 | int err; | |
2697 | ||
2698 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
2699 | nft_set_elem_policy); | |
2700 | if (err < 0) | |
2701 | return err; | |
2702 | ||
2703 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
2704 | return -EINVAL; | |
2705 | ||
2706 | elem.flags = 0; | |
2707 | if (nla[NFTA_SET_ELEM_FLAGS] != NULL) { | |
2708 | elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS])); | |
2709 | if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END) | |
2710 | return -EINVAL; | |
2711 | } | |
2712 | ||
2713 | if (set->flags & NFT_SET_MAP) { | |
2714 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
2715 | !(elem.flags & NFT_SET_ELEM_INTERVAL_END)) | |
2716 | return -EINVAL; | |
2717 | } else { | |
2718 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
2719 | return -EINVAL; | |
2720 | } | |
2721 | ||
2722 | err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]); | |
2723 | if (err < 0) | |
2724 | goto err1; | |
2725 | err = -EINVAL; | |
2726 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
2727 | goto err2; | |
2728 | ||
2729 | err = -EEXIST; | |
2730 | if (set->ops->get(set, &elem) == 0) | |
2731 | goto err2; | |
2732 | ||
2733 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { | |
2734 | err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]); | |
2735 | if (err < 0) | |
2736 | goto err2; | |
2737 | ||
2738 | err = -EINVAL; | |
2739 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
2740 | goto err3; | |
2741 | ||
2742 | dreg = nft_type_to_reg(set->dtype); | |
2743 | list_for_each_entry(binding, &set->bindings, list) { | |
2744 | struct nft_ctx bind_ctx = { | |
2745 | .afi = ctx->afi, | |
2746 | .table = ctx->table, | |
2747 | .chain = binding->chain, | |
2748 | }; | |
2749 | ||
2750 | err = nft_validate_data_load(&bind_ctx, dreg, | |
2751 | &elem.data, d2.type); | |
2752 | if (err < 0) | |
2753 | goto err3; | |
2754 | } | |
2755 | } | |
2756 | ||
2757 | err = set->ops->insert(set, &elem); | |
2758 | if (err < 0) | |
2759 | goto err3; | |
2760 | ||
2761 | return 0; | |
2762 | ||
2763 | err3: | |
2764 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
2765 | nft_data_uninit(&elem.data, d2.type); | |
2766 | err2: | |
2767 | nft_data_uninit(&elem.key, d1.type); | |
2768 | err1: | |
2769 | return err; | |
2770 | } | |
2771 | ||
2772 | static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2773 | const struct nlmsghdr *nlh, | |
2774 | const struct nlattr * const nla[]) | |
2775 | { | |
2776 | const struct nlattr *attr; | |
2777 | struct nft_set *set; | |
2778 | struct nft_ctx ctx; | |
2779 | int rem, err; | |
2780 | ||
2781 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
2782 | if (err < 0) | |
2783 | return err; | |
2784 | ||
2785 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2786 | if (IS_ERR(set)) | |
2787 | return PTR_ERR(set); | |
2788 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
2789 | return -EBUSY; | |
2790 | ||
2791 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
2792 | err = nft_add_set_elem(&ctx, set, attr); | |
2793 | if (err < 0) | |
2794 | return err; | |
2795 | } | |
2796 | return 0; | |
2797 | } | |
2798 | ||
2799 | static int nft_del_setelem(const struct nft_ctx *ctx, struct nft_set *set, | |
2800 | const struct nlattr *attr) | |
2801 | { | |
2802 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
2803 | struct nft_data_desc desc; | |
2804 | struct nft_set_elem elem; | |
2805 | int err; | |
2806 | ||
2807 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
2808 | nft_set_elem_policy); | |
2809 | if (err < 0) | |
2810 | goto err1; | |
2811 | ||
2812 | err = -EINVAL; | |
2813 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
2814 | goto err1; | |
2815 | ||
2816 | err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]); | |
2817 | if (err < 0) | |
2818 | goto err1; | |
2819 | ||
2820 | err = -EINVAL; | |
2821 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
2822 | goto err2; | |
2823 | ||
2824 | err = set->ops->get(set, &elem); | |
2825 | if (err < 0) | |
2826 | goto err2; | |
2827 | ||
2828 | set->ops->remove(set, &elem); | |
2829 | ||
2830 | nft_data_uninit(&elem.key, NFT_DATA_VALUE); | |
2831 | if (set->flags & NFT_SET_MAP) | |
2832 | nft_data_uninit(&elem.data, set->dtype); | |
2833 | ||
2834 | err2: | |
2835 | nft_data_uninit(&elem.key, desc.type); | |
2836 | err1: | |
2837 | return err; | |
2838 | } | |
2839 | ||
2840 | static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2841 | const struct nlmsghdr *nlh, | |
2842 | const struct nlattr * const nla[]) | |
2843 | { | |
2844 | const struct nlattr *attr; | |
2845 | struct nft_set *set; | |
2846 | struct nft_ctx ctx; | |
2847 | int rem, err; | |
2848 | ||
2849 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
2850 | if (err < 0) | |
2851 | return err; | |
2852 | ||
2853 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2854 | if (IS_ERR(set)) | |
2855 | return PTR_ERR(set); | |
2856 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
2857 | return -EBUSY; | |
2858 | ||
2859 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
2860 | err = nft_del_setelem(&ctx, set, attr); | |
2861 | if (err < 0) | |
2862 | return err; | |
2863 | } | |
2864 | return 0; | |
2865 | } | |
2866 | ||
96518518 PM |
2867 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
2868 | [NFT_MSG_NEWTABLE] = { | |
2869 | .call = nf_tables_newtable, | |
2870 | .attr_count = NFTA_TABLE_MAX, | |
2871 | .policy = nft_table_policy, | |
2872 | }, | |
2873 | [NFT_MSG_GETTABLE] = { | |
2874 | .call = nf_tables_gettable, | |
2875 | .attr_count = NFTA_TABLE_MAX, | |
2876 | .policy = nft_table_policy, | |
2877 | }, | |
2878 | [NFT_MSG_DELTABLE] = { | |
2879 | .call = nf_tables_deltable, | |
2880 | .attr_count = NFTA_TABLE_MAX, | |
2881 | .policy = nft_table_policy, | |
2882 | }, | |
2883 | [NFT_MSG_NEWCHAIN] = { | |
2884 | .call = nf_tables_newchain, | |
2885 | .attr_count = NFTA_CHAIN_MAX, | |
2886 | .policy = nft_chain_policy, | |
2887 | }, | |
2888 | [NFT_MSG_GETCHAIN] = { | |
2889 | .call = nf_tables_getchain, | |
2890 | .attr_count = NFTA_CHAIN_MAX, | |
2891 | .policy = nft_chain_policy, | |
2892 | }, | |
2893 | [NFT_MSG_DELCHAIN] = { | |
2894 | .call = nf_tables_delchain, | |
2895 | .attr_count = NFTA_CHAIN_MAX, | |
2896 | .policy = nft_chain_policy, | |
2897 | }, | |
2898 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 2899 | .call_batch = nf_tables_newrule, |
96518518 PM |
2900 | .attr_count = NFTA_RULE_MAX, |
2901 | .policy = nft_rule_policy, | |
2902 | }, | |
2903 | [NFT_MSG_GETRULE] = { | |
2904 | .call = nf_tables_getrule, | |
2905 | .attr_count = NFTA_RULE_MAX, | |
2906 | .policy = nft_rule_policy, | |
2907 | }, | |
2908 | [NFT_MSG_DELRULE] = { | |
0628b123 | 2909 | .call_batch = nf_tables_delrule, |
96518518 PM |
2910 | .attr_count = NFTA_RULE_MAX, |
2911 | .policy = nft_rule_policy, | |
2912 | }, | |
20a69341 PM |
2913 | [NFT_MSG_NEWSET] = { |
2914 | .call = nf_tables_newset, | |
2915 | .attr_count = NFTA_SET_MAX, | |
2916 | .policy = nft_set_policy, | |
2917 | }, | |
2918 | [NFT_MSG_GETSET] = { | |
2919 | .call = nf_tables_getset, | |
2920 | .attr_count = NFTA_SET_MAX, | |
2921 | .policy = nft_set_policy, | |
2922 | }, | |
2923 | [NFT_MSG_DELSET] = { | |
2924 | .call = nf_tables_delset, | |
2925 | .attr_count = NFTA_SET_MAX, | |
2926 | .policy = nft_set_policy, | |
2927 | }, | |
2928 | [NFT_MSG_NEWSETELEM] = { | |
2929 | .call = nf_tables_newsetelem, | |
2930 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
2931 | .policy = nft_set_elem_list_policy, | |
2932 | }, | |
2933 | [NFT_MSG_GETSETELEM] = { | |
2934 | .call = nf_tables_getsetelem, | |
2935 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
2936 | .policy = nft_set_elem_list_policy, | |
2937 | }, | |
2938 | [NFT_MSG_DELSETELEM] = { | |
2939 | .call = nf_tables_delsetelem, | |
2940 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
2941 | .policy = nft_set_elem_list_policy, | |
2942 | }, | |
96518518 PM |
2943 | }; |
2944 | ||
2945 | static const struct nfnetlink_subsystem nf_tables_subsys = { | |
2946 | .name = "nf_tables", | |
2947 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
2948 | .cb_count = NFT_MSG_MAX, | |
2949 | .cb = nf_tables_cb, | |
0628b123 PNA |
2950 | .commit = nf_tables_commit, |
2951 | .abort = nf_tables_abort, | |
96518518 PM |
2952 | }; |
2953 | ||
20a69341 PM |
2954 | /* |
2955 | * Loop detection - walk through the ruleset beginning at the destination chain | |
2956 | * of a new jump until either the source chain is reached (loop) or all | |
2957 | * reachable chains have been traversed. | |
2958 | * | |
2959 | * The loop check is performed whenever a new jump verdict is added to an | |
2960 | * expression or verdict map or a verdict map is bound to a new chain. | |
2961 | */ | |
2962 | ||
2963 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
2964 | const struct nft_chain *chain); | |
2965 | ||
2966 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
2967 | const struct nft_set *set, | |
2968 | const struct nft_set_iter *iter, | |
2969 | const struct nft_set_elem *elem) | |
2970 | { | |
2971 | switch (elem->data.verdict) { | |
2972 | case NFT_JUMP: | |
2973 | case NFT_GOTO: | |
2974 | return nf_tables_check_loops(ctx, elem->data.chain); | |
2975 | default: | |
2976 | return 0; | |
2977 | } | |
2978 | } | |
2979 | ||
2980 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
2981 | const struct nft_chain *chain) | |
2982 | { | |
2983 | const struct nft_rule *rule; | |
2984 | const struct nft_expr *expr, *last; | |
20a69341 PM |
2985 | const struct nft_set *set; |
2986 | struct nft_set_binding *binding; | |
2987 | struct nft_set_iter iter; | |
20a69341 PM |
2988 | |
2989 | if (ctx->chain == chain) | |
2990 | return -ELOOP; | |
2991 | ||
2992 | list_for_each_entry(rule, &chain->rules, list) { | |
2993 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
2994 | const struct nft_data *data = NULL; |
2995 | int err; | |
2996 | ||
2997 | if (!expr->ops->validate) | |
20a69341 PM |
2998 | continue; |
2999 | ||
0ca743a5 PNA |
3000 | err = expr->ops->validate(ctx, expr, &data); |
3001 | if (err < 0) | |
3002 | return err; | |
3003 | ||
20a69341 | 3004 | if (data == NULL) |
0ca743a5 | 3005 | continue; |
20a69341 PM |
3006 | |
3007 | switch (data->verdict) { | |
3008 | case NFT_JUMP: | |
3009 | case NFT_GOTO: | |
3010 | err = nf_tables_check_loops(ctx, data->chain); | |
3011 | if (err < 0) | |
3012 | return err; | |
3013 | default: | |
3014 | break; | |
3015 | } | |
3016 | } | |
3017 | } | |
3018 | ||
3019 | list_for_each_entry(set, &ctx->table->sets, list) { | |
3020 | if (!(set->flags & NFT_SET_MAP) || | |
3021 | set->dtype != NFT_DATA_VERDICT) | |
3022 | continue; | |
3023 | ||
3024 | list_for_each_entry(binding, &set->bindings, list) { | |
3025 | if (binding->chain != chain) | |
3026 | continue; | |
3027 | ||
3028 | iter.skip = 0; | |
3029 | iter.count = 0; | |
3030 | iter.err = 0; | |
3031 | iter.fn = nf_tables_loop_check_setelem; | |
3032 | ||
3033 | set->ops->walk(ctx, set, &iter); | |
3034 | if (iter.err < 0) | |
3035 | return iter.err; | |
3036 | } | |
3037 | } | |
3038 | ||
3039 | return 0; | |
3040 | } | |
3041 | ||
96518518 PM |
3042 | /** |
3043 | * nft_validate_input_register - validate an expressions' input register | |
3044 | * | |
3045 | * @reg: the register number | |
3046 | * | |
3047 | * Validate that the input register is one of the general purpose | |
3048 | * registers. | |
3049 | */ | |
3050 | int nft_validate_input_register(enum nft_registers reg) | |
3051 | { | |
3052 | if (reg <= NFT_REG_VERDICT) | |
3053 | return -EINVAL; | |
3054 | if (reg > NFT_REG_MAX) | |
3055 | return -ERANGE; | |
3056 | return 0; | |
3057 | } | |
3058 | EXPORT_SYMBOL_GPL(nft_validate_input_register); | |
3059 | ||
3060 | /** | |
3061 | * nft_validate_output_register - validate an expressions' output register | |
3062 | * | |
3063 | * @reg: the register number | |
3064 | * | |
3065 | * Validate that the output register is one of the general purpose | |
3066 | * registers or the verdict register. | |
3067 | */ | |
3068 | int nft_validate_output_register(enum nft_registers reg) | |
3069 | { | |
3070 | if (reg < NFT_REG_VERDICT) | |
3071 | return -EINVAL; | |
3072 | if (reg > NFT_REG_MAX) | |
3073 | return -ERANGE; | |
3074 | return 0; | |
3075 | } | |
3076 | EXPORT_SYMBOL_GPL(nft_validate_output_register); | |
3077 | ||
3078 | /** | |
3079 | * nft_validate_data_load - validate an expressions' data load | |
3080 | * | |
3081 | * @ctx: context of the expression performing the load | |
3082 | * @reg: the destination register number | |
3083 | * @data: the data to load | |
3084 | * @type: the data type | |
3085 | * | |
3086 | * Validate that a data load uses the appropriate data type for | |
3087 | * the destination register. A value of NULL for the data means | |
3088 | * that its runtime gathered data, which is always of type | |
3089 | * NFT_DATA_VALUE. | |
3090 | */ | |
3091 | int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg, | |
3092 | const struct nft_data *data, | |
3093 | enum nft_data_types type) | |
3094 | { | |
20a69341 PM |
3095 | int err; |
3096 | ||
96518518 PM |
3097 | switch (reg) { |
3098 | case NFT_REG_VERDICT: | |
3099 | if (data == NULL || type != NFT_DATA_VERDICT) | |
3100 | return -EINVAL; | |
20a69341 PM |
3101 | |
3102 | if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) { | |
3103 | err = nf_tables_check_loops(ctx, data->chain); | |
3104 | if (err < 0) | |
3105 | return err; | |
3106 | ||
3107 | if (ctx->chain->level + 1 > data->chain->level) { | |
3108 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) | |
3109 | return -EMLINK; | |
3110 | data->chain->level = ctx->chain->level + 1; | |
3111 | } | |
3112 | } | |
3113 | ||
96518518 PM |
3114 | return 0; |
3115 | default: | |
3116 | if (data != NULL && type != NFT_DATA_VALUE) | |
3117 | return -EINVAL; | |
3118 | return 0; | |
3119 | } | |
3120 | } | |
3121 | EXPORT_SYMBOL_GPL(nft_validate_data_load); | |
3122 | ||
3123 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
3124 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
3125 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
3126 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
3127 | }; | |
3128 | ||
3129 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3130 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3131 | { | |
3132 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; | |
3133 | struct nft_chain *chain; | |
3134 | int err; | |
3135 | ||
3136 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); | |
3137 | if (err < 0) | |
3138 | return err; | |
3139 | ||
3140 | if (!tb[NFTA_VERDICT_CODE]) | |
3141 | return -EINVAL; | |
3142 | data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); | |
3143 | ||
3144 | switch (data->verdict) { | |
3145 | case NF_ACCEPT: | |
3146 | case NF_DROP: | |
3147 | case NF_QUEUE: | |
3148 | case NFT_CONTINUE: | |
3149 | case NFT_BREAK: | |
3150 | case NFT_RETURN: | |
3151 | desc->len = sizeof(data->verdict); | |
3152 | break; | |
3153 | case NFT_JUMP: | |
3154 | case NFT_GOTO: | |
3155 | if (!tb[NFTA_VERDICT_CHAIN]) | |
3156 | return -EINVAL; | |
3157 | chain = nf_tables_chain_lookup(ctx->table, | |
3158 | tb[NFTA_VERDICT_CHAIN]); | |
3159 | if (IS_ERR(chain)) | |
3160 | return PTR_ERR(chain); | |
3161 | if (chain->flags & NFT_BASE_CHAIN) | |
3162 | return -EOPNOTSUPP; | |
3163 | ||
96518518 PM |
3164 | chain->use++; |
3165 | data->chain = chain; | |
3166 | desc->len = sizeof(data); | |
3167 | break; | |
3168 | default: | |
3169 | return -EINVAL; | |
3170 | } | |
3171 | ||
3172 | desc->type = NFT_DATA_VERDICT; | |
3173 | return 0; | |
3174 | } | |
3175 | ||
3176 | static void nft_verdict_uninit(const struct nft_data *data) | |
3177 | { | |
3178 | switch (data->verdict) { | |
3179 | case NFT_JUMP: | |
3180 | case NFT_GOTO: | |
3181 | data->chain->use--; | |
3182 | break; | |
3183 | } | |
3184 | } | |
3185 | ||
3186 | static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) | |
3187 | { | |
3188 | struct nlattr *nest; | |
3189 | ||
3190 | nest = nla_nest_start(skb, NFTA_DATA_VERDICT); | |
3191 | if (!nest) | |
3192 | goto nla_put_failure; | |
3193 | ||
3194 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict))) | |
3195 | goto nla_put_failure; | |
3196 | ||
3197 | switch (data->verdict) { | |
3198 | case NFT_JUMP: | |
3199 | case NFT_GOTO: | |
3200 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name)) | |
3201 | goto nla_put_failure; | |
3202 | } | |
3203 | nla_nest_end(skb, nest); | |
3204 | return 0; | |
3205 | ||
3206 | nla_put_failure: | |
3207 | return -1; | |
3208 | } | |
3209 | ||
3210 | static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3211 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3212 | { | |
3213 | unsigned int len; | |
3214 | ||
3215 | len = nla_len(nla); | |
3216 | if (len == 0) | |
3217 | return -EINVAL; | |
3218 | if (len > sizeof(data->data)) | |
3219 | return -EOVERFLOW; | |
3220 | ||
3221 | nla_memcpy(data->data, nla, sizeof(data->data)); | |
3222 | desc->type = NFT_DATA_VALUE; | |
3223 | desc->len = len; | |
3224 | return 0; | |
3225 | } | |
3226 | ||
3227 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
3228 | unsigned int len) | |
3229 | { | |
3230 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
3231 | } | |
3232 | ||
3233 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
3234 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY, | |
3235 | .len = FIELD_SIZEOF(struct nft_data, data) }, | |
3236 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, | |
3237 | }; | |
3238 | ||
3239 | /** | |
3240 | * nft_data_init - parse nf_tables data netlink attributes | |
3241 | * | |
3242 | * @ctx: context of the expression using the data | |
3243 | * @data: destination struct nft_data | |
3244 | * @desc: data description | |
3245 | * @nla: netlink attribute containing data | |
3246 | * | |
3247 | * Parse the netlink data attributes and initialize a struct nft_data. | |
3248 | * The type and length of data are returned in the data description. | |
3249 | * | |
3250 | * The caller can indicate that it only wants to accept data of type | |
3251 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
3252 | */ | |
3253 | int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3254 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3255 | { | |
3256 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
3257 | int err; | |
3258 | ||
3259 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); | |
3260 | if (err < 0) | |
3261 | return err; | |
3262 | ||
3263 | if (tb[NFTA_DATA_VALUE]) | |
3264 | return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); | |
3265 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) | |
3266 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
3267 | return -EINVAL; | |
3268 | } | |
3269 | EXPORT_SYMBOL_GPL(nft_data_init); | |
3270 | ||
3271 | /** | |
3272 | * nft_data_uninit - release a nft_data item | |
3273 | * | |
3274 | * @data: struct nft_data to release | |
3275 | * @type: type of data | |
3276 | * | |
3277 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
3278 | * all others need to be released by calling this function. | |
3279 | */ | |
3280 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) | |
3281 | { | |
3282 | switch (type) { | |
3283 | case NFT_DATA_VALUE: | |
3284 | return; | |
3285 | case NFT_DATA_VERDICT: | |
3286 | return nft_verdict_uninit(data); | |
3287 | default: | |
3288 | WARN_ON(1); | |
3289 | } | |
3290 | } | |
3291 | EXPORT_SYMBOL_GPL(nft_data_uninit); | |
3292 | ||
3293 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
3294 | enum nft_data_types type, unsigned int len) | |
3295 | { | |
3296 | struct nlattr *nest; | |
3297 | int err; | |
3298 | ||
3299 | nest = nla_nest_start(skb, attr); | |
3300 | if (nest == NULL) | |
3301 | return -1; | |
3302 | ||
3303 | switch (type) { | |
3304 | case NFT_DATA_VALUE: | |
3305 | err = nft_value_dump(skb, data, len); | |
3306 | break; | |
3307 | case NFT_DATA_VERDICT: | |
3308 | err = nft_verdict_dump(skb, data); | |
3309 | break; | |
3310 | default: | |
3311 | err = -EINVAL; | |
3312 | WARN_ON(1); | |
3313 | } | |
3314 | ||
3315 | nla_nest_end(skb, nest); | |
3316 | return err; | |
3317 | } | |
3318 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
3319 | ||
99633ab2 PNA |
3320 | static int nf_tables_init_net(struct net *net) |
3321 | { | |
3322 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 3323 | INIT_LIST_HEAD(&net->nft.commit_list); |
99633ab2 PNA |
3324 | return 0; |
3325 | } | |
3326 | ||
3327 | static struct pernet_operations nf_tables_net_ops = { | |
3328 | .init = nf_tables_init_net, | |
3329 | }; | |
3330 | ||
96518518 PM |
3331 | static int __init nf_tables_module_init(void) |
3332 | { | |
3333 | int err; | |
3334 | ||
3335 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
3336 | GFP_KERNEL); | |
3337 | if (info == NULL) { | |
3338 | err = -ENOMEM; | |
3339 | goto err1; | |
3340 | } | |
3341 | ||
3342 | err = nf_tables_core_module_init(); | |
3343 | if (err < 0) | |
3344 | goto err2; | |
3345 | ||
3346 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
3347 | if (err < 0) | |
3348 | goto err3; | |
3349 | ||
3350 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 3351 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
3352 | err3: |
3353 | nf_tables_core_module_exit(); | |
3354 | err2: | |
3355 | kfree(info); | |
3356 | err1: | |
3357 | return err; | |
3358 | } | |
3359 | ||
3360 | static void __exit nf_tables_module_exit(void) | |
3361 | { | |
99633ab2 | 3362 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
3363 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
3364 | nf_tables_core_module_exit(); | |
3365 | kfree(info); | |
3366 | } | |
3367 | ||
3368 | module_init(nf_tables_module_init); | |
3369 | module_exit(nf_tables_module_exit); | |
3370 | ||
3371 | MODULE_LICENSE("GPL"); | |
3372 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
3373 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |