Commit | Line | Data |
---|---|---|
96518518 | 1 | /* |
20a69341 | 2 | * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netlink.h> | |
16 | #include <linux/netfilter.h> | |
17 | #include <linux/netfilter/nfnetlink.h> | |
18 | #include <linux/netfilter/nf_tables.h> | |
19 | #include <net/netfilter/nf_tables_core.h> | |
20 | #include <net/netfilter/nf_tables.h> | |
99633ab2 | 21 | #include <net/net_namespace.h> |
96518518 PM |
22 | #include <net/sock.h> |
23 | ||
96518518 PM |
24 | static LIST_HEAD(nf_tables_expressions); |
25 | ||
26 | /** | |
27 | * nft_register_afinfo - register nf_tables address family info | |
28 | * | |
29 | * @afi: address family info to register | |
30 | * | |
31 | * Register the address family for use with nf_tables. Returns zero on | |
32 | * success or a negative errno code otherwise. | |
33 | */ | |
99633ab2 | 34 | int nft_register_afinfo(struct net *net, struct nft_af_info *afi) |
96518518 PM |
35 | { |
36 | INIT_LIST_HEAD(&afi->tables); | |
37 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
99633ab2 | 38 | list_add_tail(&afi->list, &net->nft.af_info); |
96518518 PM |
39 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
40 | return 0; | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(nft_register_afinfo); | |
43 | ||
44 | /** | |
45 | * nft_unregister_afinfo - unregister nf_tables address family info | |
46 | * | |
47 | * @afi: address family info to unregister | |
48 | * | |
49 | * Unregister the address family for use with nf_tables. | |
50 | */ | |
51 | void nft_unregister_afinfo(struct nft_af_info *afi) | |
52 | { | |
53 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
54 | list_del(&afi->list); | |
55 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
56 | } | |
57 | EXPORT_SYMBOL_GPL(nft_unregister_afinfo); | |
58 | ||
99633ab2 | 59 | static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family) |
96518518 PM |
60 | { |
61 | struct nft_af_info *afi; | |
62 | ||
99633ab2 | 63 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
64 | if (afi->family == family) |
65 | return afi; | |
66 | } | |
67 | return NULL; | |
68 | } | |
69 | ||
99633ab2 PNA |
70 | static struct nft_af_info * |
71 | nf_tables_afinfo_lookup(struct net *net, int family, bool autoload) | |
96518518 PM |
72 | { |
73 | struct nft_af_info *afi; | |
74 | ||
99633ab2 | 75 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
76 | if (afi != NULL) |
77 | return afi; | |
78 | #ifdef CONFIG_MODULES | |
79 | if (autoload) { | |
80 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
81 | request_module("nft-afinfo-%u", family); | |
82 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
99633ab2 | 83 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
84 | if (afi != NULL) |
85 | return ERR_PTR(-EAGAIN); | |
86 | } | |
87 | #endif | |
88 | return ERR_PTR(-EAFNOSUPPORT); | |
89 | } | |
90 | ||
7c95f6d8 PNA |
91 | static void nft_ctx_init(struct nft_ctx *ctx, |
92 | const struct sk_buff *skb, | |
93 | const struct nlmsghdr *nlh, | |
94 | struct nft_af_info *afi, | |
95 | struct nft_table *table, | |
96 | struct nft_chain *chain, | |
97 | const struct nlattr * const *nla) | |
98 | { | |
99 | ctx->net = sock_net(skb->sk); | |
100 | ctx->skb = skb; | |
101 | ctx->nlh = nlh; | |
102 | ctx->afi = afi; | |
103 | ctx->table = table; | |
104 | ctx->chain = chain; | |
105 | ctx->nla = nla; | |
106 | } | |
107 | ||
96518518 PM |
108 | /* |
109 | * Tables | |
110 | */ | |
111 | ||
112 | static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, | |
113 | const struct nlattr *nla) | |
114 | { | |
115 | struct nft_table *table; | |
116 | ||
117 | list_for_each_entry(table, &afi->tables, list) { | |
118 | if (!nla_strcmp(nla, table->name)) | |
119 | return table; | |
120 | } | |
121 | return NULL; | |
122 | } | |
123 | ||
124 | static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, | |
9370761c | 125 | const struct nlattr *nla) |
96518518 PM |
126 | { |
127 | struct nft_table *table; | |
128 | ||
129 | if (nla == NULL) | |
130 | return ERR_PTR(-EINVAL); | |
131 | ||
132 | table = nft_table_lookup(afi, nla); | |
133 | if (table != NULL) | |
134 | return table; | |
135 | ||
96518518 PM |
136 | return ERR_PTR(-ENOENT); |
137 | } | |
138 | ||
139 | static inline u64 nf_tables_alloc_handle(struct nft_table *table) | |
140 | { | |
141 | return ++table->hgenerator; | |
142 | } | |
143 | ||
2a37d755 | 144 | static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX]; |
9370761c | 145 | |
2a37d755 | 146 | static const struct nf_chain_type * |
baae3e62 | 147 | __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
9370761c PNA |
148 | { |
149 | int i; | |
150 | ||
baae3e62 | 151 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
152 | if (chain_type[family][i] != NULL && |
153 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 154 | return chain_type[family][i]; |
9370761c | 155 | } |
baae3e62 | 156 | return NULL; |
9370761c PNA |
157 | } |
158 | ||
2a37d755 | 159 | static const struct nf_chain_type * |
baae3e62 PM |
160 | nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
161 | const struct nlattr *nla, | |
162 | bool autoload) | |
9370761c | 163 | { |
2a37d755 | 164 | const struct nf_chain_type *type; |
9370761c PNA |
165 | |
166 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
167 | if (type != NULL) |
168 | return type; | |
9370761c | 169 | #ifdef CONFIG_MODULES |
93b0806f | 170 | if (autoload) { |
9370761c PNA |
171 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
172 | request_module("nft-chain-%u-%*.s", afi->family, | |
173 | nla_len(nla)-1, (const char *)nla_data(nla)); | |
174 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
175 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
176 | if (type != NULL) |
177 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
178 | } |
179 | #endif | |
93b0806f | 180 | return ERR_PTR(-ENOENT); |
9370761c PNA |
181 | } |
182 | ||
96518518 PM |
183 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
184 | [NFTA_TABLE_NAME] = { .type = NLA_STRING }, | |
9ddf6323 | 185 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
186 | }; |
187 | ||
188 | static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq, | |
189 | int event, u32 flags, int family, | |
190 | const struct nft_table *table) | |
191 | { | |
192 | struct nlmsghdr *nlh; | |
193 | struct nfgenmsg *nfmsg; | |
194 | ||
195 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
196 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
197 | if (nlh == NULL) | |
198 | goto nla_put_failure; | |
199 | ||
200 | nfmsg = nlmsg_data(nlh); | |
201 | nfmsg->nfgen_family = family; | |
202 | nfmsg->version = NFNETLINK_V0; | |
203 | nfmsg->res_id = 0; | |
204 | ||
9ddf6323 | 205 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 TB |
206 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
207 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) | |
96518518 PM |
208 | goto nla_put_failure; |
209 | ||
210 | return nlmsg_end(skb, nlh); | |
211 | ||
212 | nla_put_failure: | |
213 | nlmsg_trim(skb, nlh); | |
214 | return -1; | |
215 | } | |
216 | ||
217 | static int nf_tables_table_notify(const struct sk_buff *oskb, | |
218 | const struct nlmsghdr *nlh, | |
219 | const struct nft_table *table, | |
220 | int event, int family) | |
221 | { | |
222 | struct sk_buff *skb; | |
223 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
224 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
225 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
226 | bool report; | |
227 | int err; | |
228 | ||
229 | report = nlh ? nlmsg_report(nlh) : false; | |
230 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
231 | return 0; | |
232 | ||
233 | err = -ENOBUFS; | |
234 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
235 | if (skb == NULL) | |
236 | goto err; | |
237 | ||
238 | err = nf_tables_fill_table_info(skb, portid, seq, event, 0, | |
239 | family, table); | |
240 | if (err < 0) { | |
241 | kfree_skb(skb); | |
242 | goto err; | |
243 | } | |
244 | ||
245 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
246 | GFP_KERNEL); | |
247 | err: | |
248 | if (err < 0) | |
249 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
250 | return err; | |
251 | } | |
252 | ||
253 | static int nf_tables_dump_tables(struct sk_buff *skb, | |
254 | struct netlink_callback *cb) | |
255 | { | |
256 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
257 | const struct nft_af_info *afi; | |
258 | const struct nft_table *table; | |
259 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 260 | struct net *net = sock_net(skb->sk); |
96518518 PM |
261 | int family = nfmsg->nfgen_family; |
262 | ||
99633ab2 | 263 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
264 | if (family != NFPROTO_UNSPEC && family != afi->family) |
265 | continue; | |
266 | ||
267 | list_for_each_entry(table, &afi->tables, list) { | |
268 | if (idx < s_idx) | |
269 | goto cont; | |
270 | if (idx > s_idx) | |
271 | memset(&cb->args[1], 0, | |
272 | sizeof(cb->args) - sizeof(cb->args[0])); | |
273 | if (nf_tables_fill_table_info(skb, | |
274 | NETLINK_CB(cb->skb).portid, | |
275 | cb->nlh->nlmsg_seq, | |
276 | NFT_MSG_NEWTABLE, | |
277 | NLM_F_MULTI, | |
278 | afi->family, table) < 0) | |
279 | goto done; | |
280 | cont: | |
281 | idx++; | |
282 | } | |
283 | } | |
284 | done: | |
285 | cb->args[0] = idx; | |
286 | return skb->len; | |
287 | } | |
288 | ||
289 | static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb, | |
290 | const struct nlmsghdr *nlh, | |
291 | const struct nlattr * const nla[]) | |
292 | { | |
293 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
294 | const struct nft_af_info *afi; | |
295 | const struct nft_table *table; | |
296 | struct sk_buff *skb2; | |
99633ab2 | 297 | struct net *net = sock_net(skb->sk); |
96518518 PM |
298 | int family = nfmsg->nfgen_family; |
299 | int err; | |
300 | ||
301 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
302 | struct netlink_dump_control c = { | |
303 | .dump = nf_tables_dump_tables, | |
304 | }; | |
305 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
306 | } | |
307 | ||
99633ab2 | 308 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
309 | if (IS_ERR(afi)) |
310 | return PTR_ERR(afi); | |
311 | ||
9370761c | 312 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
313 | if (IS_ERR(table)) |
314 | return PTR_ERR(table); | |
315 | ||
316 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
317 | if (!skb2) | |
318 | return -ENOMEM; | |
319 | ||
320 | err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid, | |
321 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, | |
322 | family, table); | |
323 | if (err < 0) | |
324 | goto err; | |
325 | ||
326 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
327 | ||
328 | err: | |
329 | kfree_skb(skb2); | |
330 | return err; | |
331 | } | |
332 | ||
115a60b1 PM |
333 | static int nf_tables_table_enable(const struct nft_af_info *afi, |
334 | struct nft_table *table) | |
9ddf6323 PNA |
335 | { |
336 | struct nft_chain *chain; | |
337 | int err, i = 0; | |
338 | ||
339 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
340 | if (!(chain->flags & NFT_BASE_CHAIN)) |
341 | continue; | |
342 | ||
115a60b1 | 343 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
344 | if (err < 0) |
345 | goto err; | |
346 | ||
347 | i++; | |
348 | } | |
349 | return 0; | |
350 | err: | |
351 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
352 | if (!(chain->flags & NFT_BASE_CHAIN)) |
353 | continue; | |
354 | ||
9ddf6323 PNA |
355 | if (i-- <= 0) |
356 | break; | |
357 | ||
115a60b1 | 358 | nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
359 | } |
360 | return err; | |
361 | } | |
362 | ||
115a60b1 PM |
363 | static int nf_tables_table_disable(const struct nft_af_info *afi, |
364 | struct nft_table *table) | |
9ddf6323 PNA |
365 | { |
366 | struct nft_chain *chain; | |
367 | ||
d2012975 PNA |
368 | list_for_each_entry(chain, &table->chains, list) { |
369 | if (chain->flags & NFT_BASE_CHAIN) | |
115a60b1 PM |
370 | nf_unregister_hooks(nft_base_chain(chain)->ops, |
371 | afi->nops); | |
d2012975 | 372 | } |
9ddf6323 PNA |
373 | |
374 | return 0; | |
375 | } | |
376 | ||
377 | static int nf_tables_updtable(struct sock *nlsk, struct sk_buff *skb, | |
378 | const struct nlmsghdr *nlh, | |
379 | const struct nlattr * const nla[], | |
380 | struct nft_af_info *afi, struct nft_table *table) | |
381 | { | |
382 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
383 | int family = nfmsg->nfgen_family, ret = 0; | |
384 | ||
385 | if (nla[NFTA_TABLE_FLAGS]) { | |
c5c1f975 | 386 | u32 flags; |
9ddf6323 PNA |
387 | |
388 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
389 | if (flags & ~NFT_TABLE_F_DORMANT) | |
390 | return -EINVAL; | |
391 | ||
392 | if ((flags & NFT_TABLE_F_DORMANT) && | |
393 | !(table->flags & NFT_TABLE_F_DORMANT)) { | |
115a60b1 | 394 | ret = nf_tables_table_disable(afi, table); |
9ddf6323 PNA |
395 | if (ret >= 0) |
396 | table->flags |= NFT_TABLE_F_DORMANT; | |
397 | } else if (!(flags & NFT_TABLE_F_DORMANT) && | |
398 | table->flags & NFT_TABLE_F_DORMANT) { | |
115a60b1 | 399 | ret = nf_tables_table_enable(afi, table); |
9ddf6323 PNA |
400 | if (ret >= 0) |
401 | table->flags &= ~NFT_TABLE_F_DORMANT; | |
402 | } | |
403 | if (ret < 0) | |
404 | goto err; | |
405 | } | |
406 | ||
407 | nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family); | |
408 | err: | |
409 | return ret; | |
410 | } | |
411 | ||
96518518 PM |
412 | static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb, |
413 | const struct nlmsghdr *nlh, | |
414 | const struct nlattr * const nla[]) | |
415 | { | |
416 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
417 | const struct nlattr *name; | |
418 | struct nft_af_info *afi; | |
419 | struct nft_table *table; | |
99633ab2 | 420 | struct net *net = sock_net(skb->sk); |
96518518 | 421 | int family = nfmsg->nfgen_family; |
c5c1f975 | 422 | u32 flags = 0; |
96518518 | 423 | |
99633ab2 | 424 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
425 | if (IS_ERR(afi)) |
426 | return PTR_ERR(afi); | |
427 | ||
428 | name = nla[NFTA_TABLE_NAME]; | |
9370761c | 429 | table = nf_tables_table_lookup(afi, name); |
96518518 PM |
430 | if (IS_ERR(table)) { |
431 | if (PTR_ERR(table) != -ENOENT) | |
432 | return PTR_ERR(table); | |
433 | table = NULL; | |
434 | } | |
435 | ||
436 | if (table != NULL) { | |
437 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
438 | return -EEXIST; | |
439 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
440 | return -EOPNOTSUPP; | |
9ddf6323 | 441 | return nf_tables_updtable(nlsk, skb, nlh, nla, afi, table); |
96518518 PM |
442 | } |
443 | ||
c5c1f975 PM |
444 | if (nla[NFTA_TABLE_FLAGS]) { |
445 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
446 | if (flags & ~NFT_TABLE_F_DORMANT) | |
447 | return -EINVAL; | |
448 | } | |
449 | ||
7047f9d0 PM |
450 | if (!try_module_get(afi->owner)) |
451 | return -EAFNOSUPPORT; | |
452 | ||
96518518 | 453 | table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL); |
7047f9d0 PM |
454 | if (table == NULL) { |
455 | module_put(afi->owner); | |
96518518 | 456 | return -ENOMEM; |
7047f9d0 | 457 | } |
96518518 PM |
458 | |
459 | nla_strlcpy(table->name, name, nla_len(name)); | |
460 | INIT_LIST_HEAD(&table->chains); | |
20a69341 | 461 | INIT_LIST_HEAD(&table->sets); |
c5c1f975 | 462 | table->flags = flags; |
9ddf6323 | 463 | |
96518518 PM |
464 | list_add_tail(&table->list, &afi->tables); |
465 | nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family); | |
466 | return 0; | |
467 | } | |
468 | ||
469 | static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb, | |
470 | const struct nlmsghdr *nlh, | |
471 | const struct nlattr * const nla[]) | |
472 | { | |
473 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
474 | struct nft_af_info *afi; | |
475 | struct nft_table *table; | |
99633ab2 | 476 | struct net *net = sock_net(skb->sk); |
96518518 PM |
477 | int family = nfmsg->nfgen_family; |
478 | ||
99633ab2 | 479 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
480 | if (IS_ERR(afi)) |
481 | return PTR_ERR(afi); | |
482 | ||
9370761c | 483 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
484 | if (IS_ERR(table)) |
485 | return PTR_ERR(table); | |
486 | ||
44a6f0df | 487 | if (!list_empty(&table->chains) || !list_empty(&table->sets)) |
96518518 PM |
488 | return -EBUSY; |
489 | ||
490 | list_del(&table->list); | |
491 | nf_tables_table_notify(skb, nlh, table, NFT_MSG_DELTABLE, family); | |
492 | kfree(table); | |
7047f9d0 | 493 | module_put(afi->owner); |
96518518 PM |
494 | return 0; |
495 | } | |
496 | ||
2a37d755 | 497 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 498 | { |
9370761c | 499 | int err = 0; |
96518518 PM |
500 | |
501 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
9370761c PNA |
502 | if (chain_type[ctype->family][ctype->type] != NULL) { |
503 | err = -EBUSY; | |
504 | goto out; | |
96518518 | 505 | } |
9370761c PNA |
506 | chain_type[ctype->family][ctype->type] = ctype; |
507 | out: | |
96518518 PM |
508 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
509 | return err; | |
510 | } | |
9370761c | 511 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 512 | |
2a37d755 | 513 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 514 | { |
96518518 | 515 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 516 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
517 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
518 | } | |
9370761c | 519 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
520 | |
521 | /* | |
522 | * Chains | |
523 | */ | |
524 | ||
525 | static struct nft_chain * | |
526 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) | |
527 | { | |
528 | struct nft_chain *chain; | |
529 | ||
530 | list_for_each_entry(chain, &table->chains, list) { | |
531 | if (chain->handle == handle) | |
532 | return chain; | |
533 | } | |
534 | ||
535 | return ERR_PTR(-ENOENT); | |
536 | } | |
537 | ||
538 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
539 | const struct nlattr *nla) | |
540 | { | |
541 | struct nft_chain *chain; | |
542 | ||
543 | if (nla == NULL) | |
544 | return ERR_PTR(-EINVAL); | |
545 | ||
546 | list_for_each_entry(chain, &table->chains, list) { | |
547 | if (!nla_strcmp(nla, chain->name)) | |
548 | return chain; | |
549 | } | |
550 | ||
551 | return ERR_PTR(-ENOENT); | |
552 | } | |
553 | ||
554 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
555 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, | |
556 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, | |
557 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
558 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
559 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 560 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 561 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 562 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
563 | }; |
564 | ||
565 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
566 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
567 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
568 | }; | |
569 | ||
0ca743a5 PNA |
570 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
571 | { | |
572 | struct nft_stats *cpu_stats, total; | |
573 | struct nlattr *nest; | |
574 | int cpu; | |
575 | ||
576 | memset(&total, 0, sizeof(total)); | |
577 | for_each_possible_cpu(cpu) { | |
578 | cpu_stats = per_cpu_ptr(stats, cpu); | |
579 | total.pkts += cpu_stats->pkts; | |
580 | total.bytes += cpu_stats->bytes; | |
581 | } | |
582 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
583 | if (nest == NULL) | |
584 | goto nla_put_failure; | |
585 | ||
586 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) || | |
587 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes))) | |
588 | goto nla_put_failure; | |
589 | ||
590 | nla_nest_end(skb, nest); | |
591 | return 0; | |
592 | ||
593 | nla_put_failure: | |
594 | return -ENOSPC; | |
595 | } | |
596 | ||
96518518 PM |
597 | static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq, |
598 | int event, u32 flags, int family, | |
599 | const struct nft_table *table, | |
600 | const struct nft_chain *chain) | |
601 | { | |
602 | struct nlmsghdr *nlh; | |
603 | struct nfgenmsg *nfmsg; | |
604 | ||
605 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
606 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
607 | if (nlh == NULL) | |
608 | goto nla_put_failure; | |
609 | ||
610 | nfmsg = nlmsg_data(nlh); | |
611 | nfmsg->nfgen_family = family; | |
612 | nfmsg->version = NFNETLINK_V0; | |
613 | nfmsg->res_id = 0; | |
614 | ||
615 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
616 | goto nla_put_failure; | |
617 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle))) | |
618 | goto nla_put_failure; | |
619 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
620 | goto nla_put_failure; | |
621 | ||
622 | if (chain->flags & NFT_BASE_CHAIN) { | |
0ca743a5 | 623 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 624 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
625 | struct nlattr *nest; |
626 | ||
627 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
628 | if (nest == NULL) |
629 | goto nla_put_failure; | |
630 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
631 | goto nla_put_failure; | |
632 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
633 | goto nla_put_failure; | |
634 | nla_nest_end(skb, nest); | |
9370761c | 635 | |
0ca743a5 PNA |
636 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
637 | htonl(basechain->policy))) | |
638 | goto nla_put_failure; | |
639 | ||
baae3e62 PM |
640 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
641 | goto nla_put_failure; | |
0ca743a5 PNA |
642 | |
643 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
644 | goto nla_put_failure; | |
96518518 PM |
645 | } |
646 | ||
0ca743a5 PNA |
647 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
648 | goto nla_put_failure; | |
649 | ||
96518518 PM |
650 | return nlmsg_end(skb, nlh); |
651 | ||
652 | nla_put_failure: | |
653 | nlmsg_trim(skb, nlh); | |
654 | return -1; | |
655 | } | |
656 | ||
657 | static int nf_tables_chain_notify(const struct sk_buff *oskb, | |
658 | const struct nlmsghdr *nlh, | |
659 | const struct nft_table *table, | |
660 | const struct nft_chain *chain, | |
661 | int event, int family) | |
662 | { | |
663 | struct sk_buff *skb; | |
664 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
665 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
666 | u32 seq = nlh ? nlh->nlmsg_seq : 0; | |
667 | bool report; | |
668 | int err; | |
669 | ||
670 | report = nlh ? nlmsg_report(nlh) : false; | |
671 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
672 | return 0; | |
673 | ||
674 | err = -ENOBUFS; | |
675 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
676 | if (skb == NULL) | |
677 | goto err; | |
678 | ||
679 | err = nf_tables_fill_chain_info(skb, portid, seq, event, 0, family, | |
680 | table, chain); | |
681 | if (err < 0) { | |
682 | kfree_skb(skb); | |
683 | goto err; | |
684 | } | |
685 | ||
686 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
687 | GFP_KERNEL); | |
688 | err: | |
689 | if (err < 0) | |
690 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
691 | return err; | |
692 | } | |
693 | ||
694 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
695 | struct netlink_callback *cb) | |
696 | { | |
697 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
698 | const struct nft_af_info *afi; | |
699 | const struct nft_table *table; | |
700 | const struct nft_chain *chain; | |
701 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 702 | struct net *net = sock_net(skb->sk); |
96518518 PM |
703 | int family = nfmsg->nfgen_family; |
704 | ||
99633ab2 | 705 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
706 | if (family != NFPROTO_UNSPEC && family != afi->family) |
707 | continue; | |
708 | ||
709 | list_for_each_entry(table, &afi->tables, list) { | |
710 | list_for_each_entry(chain, &table->chains, list) { | |
711 | if (idx < s_idx) | |
712 | goto cont; | |
713 | if (idx > s_idx) | |
714 | memset(&cb->args[1], 0, | |
715 | sizeof(cb->args) - sizeof(cb->args[0])); | |
716 | if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid, | |
717 | cb->nlh->nlmsg_seq, | |
718 | NFT_MSG_NEWCHAIN, | |
719 | NLM_F_MULTI, | |
720 | afi->family, table, chain) < 0) | |
721 | goto done; | |
722 | cont: | |
723 | idx++; | |
724 | } | |
725 | } | |
726 | } | |
727 | done: | |
728 | cb->args[0] = idx; | |
729 | return skb->len; | |
730 | } | |
731 | ||
732 | ||
733 | static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb, | |
734 | const struct nlmsghdr *nlh, | |
735 | const struct nlattr * const nla[]) | |
736 | { | |
737 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
738 | const struct nft_af_info *afi; | |
739 | const struct nft_table *table; | |
740 | const struct nft_chain *chain; | |
741 | struct sk_buff *skb2; | |
99633ab2 | 742 | struct net *net = sock_net(skb->sk); |
96518518 PM |
743 | int family = nfmsg->nfgen_family; |
744 | int err; | |
745 | ||
746 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
747 | struct netlink_dump_control c = { | |
748 | .dump = nf_tables_dump_chains, | |
749 | }; | |
750 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
751 | } | |
752 | ||
99633ab2 | 753 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
754 | if (IS_ERR(afi)) |
755 | return PTR_ERR(afi); | |
756 | ||
9370761c | 757 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
758 | if (IS_ERR(table)) |
759 | return PTR_ERR(table); | |
760 | ||
761 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
762 | if (IS_ERR(chain)) | |
763 | return PTR_ERR(chain); | |
764 | ||
765 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
766 | if (!skb2) | |
767 | return -ENOMEM; | |
768 | ||
769 | err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid, | |
770 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, | |
771 | family, table, chain); | |
772 | if (err < 0) | |
773 | goto err; | |
774 | ||
775 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
776 | ||
777 | err: | |
778 | kfree_skb(skb2); | |
779 | return err; | |
780 | } | |
781 | ||
0ca743a5 PNA |
782 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
783 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
784 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
785 | }; | |
786 | ||
787 | static int | |
788 | nf_tables_counters(struct nft_base_chain *chain, const struct nlattr *attr) | |
789 | { | |
790 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
791 | struct nft_stats __percpu *newstats; | |
792 | struct nft_stats *stats; | |
793 | int err; | |
794 | ||
795 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); | |
796 | if (err < 0) | |
797 | return err; | |
798 | ||
799 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
800 | return -EINVAL; | |
801 | ||
802 | newstats = alloc_percpu(struct nft_stats); | |
803 | if (newstats == NULL) | |
804 | return -ENOMEM; | |
805 | ||
806 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
807 | * are not exposed to userspace. | |
808 | */ | |
809 | stats = this_cpu_ptr(newstats); | |
810 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
811 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
812 | ||
813 | if (chain->stats) { | |
0ca743a5 | 814 | struct nft_stats __percpu *oldstats = |
67a8fc27 | 815 | nft_dereference(chain->stats); |
0ca743a5 PNA |
816 | |
817 | rcu_assign_pointer(chain->stats, newstats); | |
818 | synchronize_rcu(); | |
819 | free_percpu(oldstats); | |
820 | } else | |
821 | rcu_assign_pointer(chain->stats, newstats); | |
822 | ||
823 | return 0; | |
824 | } | |
825 | ||
96518518 PM |
826 | static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb, |
827 | const struct nlmsghdr *nlh, | |
828 | const struct nlattr * const nla[]) | |
829 | { | |
830 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
831 | const struct nlattr * uninitialized_var(name); | |
7c95f6d8 | 832 | struct nft_af_info *afi; |
96518518 PM |
833 | struct nft_table *table; |
834 | struct nft_chain *chain; | |
0ca743a5 | 835 | struct nft_base_chain *basechain = NULL; |
96518518 | 836 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
99633ab2 | 837 | struct net *net = sock_net(skb->sk); |
96518518 | 838 | int family = nfmsg->nfgen_family; |
57de2a0c | 839 | u8 policy = NF_ACCEPT; |
96518518 | 840 | u64 handle = 0; |
115a60b1 | 841 | unsigned int i; |
96518518 PM |
842 | int err; |
843 | bool create; | |
844 | ||
845 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
846 | ||
99633ab2 | 847 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
848 | if (IS_ERR(afi)) |
849 | return PTR_ERR(afi); | |
850 | ||
9370761c | 851 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
852 | if (IS_ERR(table)) |
853 | return PTR_ERR(table); | |
854 | ||
96518518 PM |
855 | chain = NULL; |
856 | name = nla[NFTA_CHAIN_NAME]; | |
857 | ||
858 | if (nla[NFTA_CHAIN_HANDLE]) { | |
859 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
860 | chain = nf_tables_chain_lookup_byhandle(table, handle); | |
861 | if (IS_ERR(chain)) | |
862 | return PTR_ERR(chain); | |
863 | } else { | |
864 | chain = nf_tables_chain_lookup(table, name); | |
865 | if (IS_ERR(chain)) { | |
866 | if (PTR_ERR(chain) != -ENOENT) | |
867 | return PTR_ERR(chain); | |
868 | chain = NULL; | |
869 | } | |
870 | } | |
871 | ||
57de2a0c PM |
872 | if (nla[NFTA_CHAIN_POLICY]) { |
873 | if ((chain != NULL && | |
874 | !(chain->flags & NFT_BASE_CHAIN)) || | |
875 | nla[NFTA_CHAIN_HOOK] == NULL) | |
876 | return -EOPNOTSUPP; | |
877 | ||
8f46df18 | 878 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
879 | switch (policy) { |
880 | case NF_DROP: | |
881 | case NF_ACCEPT: | |
882 | break; | |
883 | default: | |
884 | return -EINVAL; | |
885 | } | |
886 | } | |
887 | ||
96518518 PM |
888 | if (chain != NULL) { |
889 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
890 | return -EEXIST; | |
891 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
892 | return -EOPNOTSUPP; | |
893 | ||
894 | if (nla[NFTA_CHAIN_HANDLE] && name && | |
895 | !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) | |
896 | return -EEXIST; | |
897 | ||
0ca743a5 PNA |
898 | if (nla[NFTA_CHAIN_COUNTERS]) { |
899 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
900 | return -EOPNOTSUPP; | |
901 | ||
902 | err = nf_tables_counters(nft_base_chain(chain), | |
903 | nla[NFTA_CHAIN_COUNTERS]); | |
904 | if (err < 0) | |
905 | return err; | |
906 | } | |
907 | ||
4401a862 PM |
908 | if (nla[NFTA_CHAIN_POLICY]) |
909 | nft_base_chain(chain)->policy = policy; | |
910 | ||
96518518 PM |
911 | if (nla[NFTA_CHAIN_HANDLE] && name) |
912 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); | |
913 | ||
914 | goto notify; | |
915 | } | |
916 | ||
75820676 PM |
917 | if (table->use == UINT_MAX) |
918 | return -EOVERFLOW; | |
919 | ||
96518518 | 920 | if (nla[NFTA_CHAIN_HOOK]) { |
2a37d755 | 921 | const struct nf_chain_type *type; |
96518518 | 922 | struct nf_hook_ops *ops; |
9370761c | 923 | nf_hookfn *hookfn; |
115a60b1 | 924 | u32 hooknum, priority; |
9370761c | 925 | |
baae3e62 | 926 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
9370761c PNA |
927 | if (nla[NFTA_CHAIN_TYPE]) { |
928 | type = nf_tables_chain_type_lookup(afi, | |
929 | nla[NFTA_CHAIN_TYPE], | |
930 | create); | |
93b0806f PM |
931 | if (IS_ERR(type)) |
932 | return PTR_ERR(type); | |
9370761c | 933 | } |
96518518 PM |
934 | |
935 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
936 | nft_hook_policy); | |
937 | if (err < 0) | |
938 | return err; | |
939 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
940 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
941 | return -EINVAL; | |
9370761c PNA |
942 | |
943 | hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
944 | if (hooknum >= afi->nhooks) | |
96518518 | 945 | return -EINVAL; |
115a60b1 | 946 | priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
96518518 | 947 | |
baae3e62 | 948 | if (!(type->hook_mask & (1 << hooknum))) |
9370761c | 949 | return -EOPNOTSUPP; |
fa2c1de0 | 950 | if (!try_module_get(type->owner)) |
baae3e62 | 951 | return -ENOENT; |
fa2c1de0 | 952 | hookfn = type->hooks[hooknum]; |
9370761c | 953 | |
96518518 PM |
954 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
955 | if (basechain == NULL) | |
956 | return -ENOMEM; | |
9370761c | 957 | |
4401a862 PM |
958 | if (nla[NFTA_CHAIN_COUNTERS]) { |
959 | err = nf_tables_counters(basechain, | |
960 | nla[NFTA_CHAIN_COUNTERS]); | |
961 | if (err < 0) { | |
fa2c1de0 | 962 | module_put(type->owner); |
4401a862 PM |
963 | kfree(basechain); |
964 | return err; | |
965 | } | |
966 | } else { | |
967 | struct nft_stats __percpu *newstats; | |
968 | ||
969 | newstats = alloc_percpu(struct nft_stats); | |
970 | if (newstats == NULL) { | |
fa2c1de0 | 971 | module_put(type->owner); |
4401a862 PM |
972 | kfree(basechain); |
973 | return -ENOMEM; | |
974 | } | |
975 | rcu_assign_pointer(basechain->stats, newstats); | |
976 | } | |
977 | ||
9370761c | 978 | basechain->type = type; |
96518518 PM |
979 | chain = &basechain->chain; |
980 | ||
115a60b1 PM |
981 | for (i = 0; i < afi->nops; i++) { |
982 | ops = &basechain->ops[i]; | |
983 | ops->pf = family; | |
984 | ops->owner = afi->owner; | |
985 | ops->hooknum = hooknum; | |
986 | ops->priority = priority; | |
987 | ops->priv = chain; | |
988 | ops->hook = afi->hooks[ops->hooknum]; | |
989 | if (hookfn) | |
990 | ops->hook = hookfn; | |
991 | if (afi->hook_ops_init) | |
992 | afi->hook_ops_init(ops, i); | |
993 | } | |
96518518 PM |
994 | |
995 | chain->flags |= NFT_BASE_CHAIN; | |
57de2a0c | 996 | basechain->policy = policy; |
96518518 PM |
997 | } else { |
998 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
999 | if (chain == NULL) | |
1000 | return -ENOMEM; | |
1001 | } | |
1002 | ||
1003 | INIT_LIST_HEAD(&chain->rules); | |
1004 | chain->handle = nf_tables_alloc_handle(table); | |
0628b123 | 1005 | chain->net = net; |
b5bc89bf | 1006 | chain->table = table; |
96518518 PM |
1007 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
1008 | ||
9ddf6323 PNA |
1009 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
1010 | chain->flags & NFT_BASE_CHAIN) { | |
115a60b1 | 1011 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
0ca743a5 | 1012 | if (err < 0) { |
fa2c1de0 | 1013 | module_put(basechain->type->owner); |
0ca743a5 PNA |
1014 | free_percpu(basechain->stats); |
1015 | kfree(basechain); | |
1016 | return err; | |
1017 | } | |
1018 | } | |
9ddf6323 PNA |
1019 | list_add_tail(&chain->list, &table->chains); |
1020 | table->use++; | |
96518518 PM |
1021 | notify: |
1022 | nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_NEWCHAIN, | |
1023 | family); | |
1024 | return 0; | |
1025 | } | |
1026 | ||
0165d932 | 1027 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
96518518 | 1028 | { |
96518518 PM |
1029 | BUG_ON(chain->use > 0); |
1030 | ||
0ca743a5 | 1031 | if (chain->flags & NFT_BASE_CHAIN) { |
fa2c1de0 | 1032 | module_put(nft_base_chain(chain)->type->owner); |
0ca743a5 | 1033 | free_percpu(nft_base_chain(chain)->stats); |
96518518 | 1034 | kfree(nft_base_chain(chain)); |
0ca743a5 | 1035 | } else |
96518518 PM |
1036 | kfree(chain); |
1037 | } | |
1038 | ||
1039 | static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb, | |
1040 | const struct nlmsghdr *nlh, | |
1041 | const struct nlattr * const nla[]) | |
1042 | { | |
1043 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 | 1044 | struct nft_af_info *afi; |
96518518 PM |
1045 | struct nft_table *table; |
1046 | struct nft_chain *chain; | |
99633ab2 | 1047 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1048 | int family = nfmsg->nfgen_family; |
1049 | ||
99633ab2 | 1050 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1051 | if (IS_ERR(afi)) |
1052 | return PTR_ERR(afi); | |
1053 | ||
9370761c | 1054 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
1055 | if (IS_ERR(table)) |
1056 | return PTR_ERR(table); | |
1057 | ||
1058 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
1059 | if (IS_ERR(chain)) | |
1060 | return PTR_ERR(chain); | |
1061 | ||
3dd7279f | 1062 | if (!list_empty(&chain->rules) || chain->use > 0) |
96518518 PM |
1063 | return -EBUSY; |
1064 | ||
1065 | list_del(&chain->list); | |
1066 | table->use--; | |
1067 | ||
9ddf6323 PNA |
1068 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
1069 | chain->flags & NFT_BASE_CHAIN) | |
115a60b1 | 1070 | nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
96518518 PM |
1071 | |
1072 | nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN, | |
1073 | family); | |
1074 | ||
1075 | /* Make sure all rule references are gone before this is released */ | |
0165d932 PNA |
1076 | synchronize_rcu(); |
1077 | ||
1078 | nf_tables_chain_destroy(chain); | |
96518518 PM |
1079 | return 0; |
1080 | } | |
1081 | ||
96518518 PM |
1082 | /* |
1083 | * Expressions | |
1084 | */ | |
1085 | ||
1086 | /** | |
ef1f7df9 PM |
1087 | * nft_register_expr - register nf_tables expr type |
1088 | * @ops: expr type | |
96518518 | 1089 | * |
ef1f7df9 | 1090 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1091 | * success or a negative errno code otherwise. |
1092 | */ | |
ef1f7df9 | 1093 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1094 | { |
1095 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec TB |
1096 | if (type->family == NFPROTO_UNSPEC) |
1097 | list_add_tail(&type->list, &nf_tables_expressions); | |
1098 | else | |
1099 | list_add(&type->list, &nf_tables_expressions); | |
96518518 PM |
1100 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1101 | return 0; | |
1102 | } | |
1103 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1104 | ||
1105 | /** | |
ef1f7df9 PM |
1106 | * nft_unregister_expr - unregister nf_tables expr type |
1107 | * @ops: expr type | |
96518518 | 1108 | * |
ef1f7df9 | 1109 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1110 | */ |
ef1f7df9 | 1111 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1112 | { |
1113 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
ef1f7df9 | 1114 | list_del(&type->list); |
96518518 PM |
1115 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1116 | } | |
1117 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1118 | ||
64d46806 PM |
1119 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1120 | struct nlattr *nla) | |
96518518 | 1121 | { |
ef1f7df9 | 1122 | const struct nft_expr_type *type; |
96518518 | 1123 | |
ef1f7df9 | 1124 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1125 | if (!nla_strcmp(nla, type->name) && |
1126 | (!type->family || type->family == family)) | |
ef1f7df9 | 1127 | return type; |
96518518 PM |
1128 | } |
1129 | return NULL; | |
1130 | } | |
1131 | ||
64d46806 PM |
1132 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1133 | struct nlattr *nla) | |
96518518 | 1134 | { |
ef1f7df9 | 1135 | const struct nft_expr_type *type; |
96518518 PM |
1136 | |
1137 | if (nla == NULL) | |
1138 | return ERR_PTR(-EINVAL); | |
1139 | ||
64d46806 | 1140 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1141 | if (type != NULL && try_module_get(type->owner)) |
1142 | return type; | |
96518518 PM |
1143 | |
1144 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1145 | if (type == NULL) { |
64d46806 PM |
1146 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1147 | request_module("nft-expr-%u-%.*s", family, | |
1148 | nla_len(nla), (char *)nla_data(nla)); | |
1149 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1150 | if (__nft_expr_type_get(family, nla)) | |
1151 | return ERR_PTR(-EAGAIN); | |
1152 | ||
96518518 PM |
1153 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1154 | request_module("nft-expr-%.*s", | |
1155 | nla_len(nla), (char *)nla_data(nla)); | |
1156 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1157 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1158 | return ERR_PTR(-EAGAIN); |
1159 | } | |
1160 | #endif | |
1161 | return ERR_PTR(-ENOENT); | |
1162 | } | |
1163 | ||
1164 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1165 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1166 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1167 | }; | |
1168 | ||
1169 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1170 | const struct nft_expr *expr) | |
1171 | { | |
ef1f7df9 | 1172 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1173 | goto nla_put_failure; |
1174 | ||
1175 | if (expr->ops->dump) { | |
1176 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1177 | if (data == NULL) | |
1178 | goto nla_put_failure; | |
1179 | if (expr->ops->dump(skb, expr) < 0) | |
1180 | goto nla_put_failure; | |
1181 | nla_nest_end(skb, data); | |
1182 | } | |
1183 | ||
1184 | return skb->len; | |
1185 | ||
1186 | nla_put_failure: | |
1187 | return -1; | |
1188 | }; | |
1189 | ||
1190 | struct nft_expr_info { | |
1191 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1192 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1193 | }; |
1194 | ||
0ca743a5 PNA |
1195 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1196 | const struct nlattr *nla, | |
96518518 PM |
1197 | struct nft_expr_info *info) |
1198 | { | |
ef1f7df9 | 1199 | const struct nft_expr_type *type; |
96518518 | 1200 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1201 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1202 | int err; |
1203 | ||
ef1f7df9 | 1204 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
96518518 PM |
1205 | if (err < 0) |
1206 | return err; | |
1207 | ||
64d46806 | 1208 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1209 | if (IS_ERR(type)) |
1210 | return PTR_ERR(type); | |
1211 | ||
1212 | if (tb[NFTA_EXPR_DATA]) { | |
1213 | err = nla_parse_nested(info->tb, type->maxattr, | |
1214 | tb[NFTA_EXPR_DATA], type->policy); | |
1215 | if (err < 0) | |
1216 | goto err1; | |
1217 | } else | |
1218 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1219 | ||
1220 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1221 | ops = type->select_ops(ctx, |
1222 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1223 | if (IS_ERR(ops)) { |
1224 | err = PTR_ERR(ops); | |
1225 | goto err1; | |
1226 | } | |
1227 | } else | |
1228 | ops = type->ops; | |
1229 | ||
96518518 PM |
1230 | info->ops = ops; |
1231 | return 0; | |
ef1f7df9 PM |
1232 | |
1233 | err1: | |
1234 | module_put(type->owner); | |
1235 | return err; | |
96518518 PM |
1236 | } |
1237 | ||
1238 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1239 | const struct nft_expr_info *info, |
96518518 PM |
1240 | struct nft_expr *expr) |
1241 | { | |
1242 | const struct nft_expr_ops *ops = info->ops; | |
1243 | int err; | |
1244 | ||
1245 | expr->ops = ops; | |
1246 | if (ops->init) { | |
ef1f7df9 | 1247 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1248 | if (err < 0) |
1249 | goto err1; | |
1250 | } | |
1251 | ||
96518518 PM |
1252 | return 0; |
1253 | ||
1254 | err1: | |
1255 | expr->ops = NULL; | |
1256 | return err; | |
1257 | } | |
1258 | ||
62472bce PM |
1259 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1260 | struct nft_expr *expr) | |
96518518 PM |
1261 | { |
1262 | if (expr->ops->destroy) | |
62472bce | 1263 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1264 | module_put(expr->ops->type->owner); |
96518518 PM |
1265 | } |
1266 | ||
1267 | /* | |
1268 | * Rules | |
1269 | */ | |
1270 | ||
1271 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1272 | u64 handle) | |
1273 | { | |
1274 | struct nft_rule *rule; | |
1275 | ||
1276 | // FIXME: this sucks | |
1277 | list_for_each_entry(rule, &chain->rules, list) { | |
1278 | if (handle == rule->handle) | |
1279 | return rule; | |
1280 | } | |
1281 | ||
1282 | return ERR_PTR(-ENOENT); | |
1283 | } | |
1284 | ||
1285 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1286 | const struct nlattr *nla) | |
1287 | { | |
1288 | if (nla == NULL) | |
1289 | return ERR_PTR(-EINVAL); | |
1290 | ||
1291 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1292 | } | |
1293 | ||
1294 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
1295 | [NFTA_RULE_TABLE] = { .type = NLA_STRING }, | |
1296 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, | |
1297 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1298 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1299 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1300 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1301 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1302 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1303 | .len = NFT_USERDATA_MAXLEN }, | |
96518518 PM |
1304 | }; |
1305 | ||
1306 | static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq, | |
1307 | int event, u32 flags, int family, | |
1308 | const struct nft_table *table, | |
1309 | const struct nft_chain *chain, | |
1310 | const struct nft_rule *rule) | |
1311 | { | |
1312 | struct nlmsghdr *nlh; | |
1313 | struct nfgenmsg *nfmsg; | |
1314 | const struct nft_expr *expr, *next; | |
1315 | struct nlattr *list; | |
5e948466 EL |
1316 | const struct nft_rule *prule; |
1317 | int type = event | NFNL_SUBSYS_NFTABLES << 8; | |
96518518 | 1318 | |
5e948466 | 1319 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
96518518 PM |
1320 | flags); |
1321 | if (nlh == NULL) | |
1322 | goto nla_put_failure; | |
1323 | ||
1324 | nfmsg = nlmsg_data(nlh); | |
1325 | nfmsg->nfgen_family = family; | |
1326 | nfmsg->version = NFNETLINK_V0; | |
1327 | nfmsg->res_id = 0; | |
1328 | ||
1329 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1330 | goto nla_put_failure; | |
1331 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1332 | goto nla_put_failure; | |
1333 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle))) | |
1334 | goto nla_put_failure; | |
1335 | ||
5e948466 EL |
1336 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
1337 | prule = list_entry(rule->list.prev, struct nft_rule, list); | |
1338 | if (nla_put_be64(skb, NFTA_RULE_POSITION, | |
1339 | cpu_to_be64(prule->handle))) | |
1340 | goto nla_put_failure; | |
1341 | } | |
1342 | ||
96518518 PM |
1343 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
1344 | if (list == NULL) | |
1345 | goto nla_put_failure; | |
1346 | nft_rule_for_each_expr(expr, next, rule) { | |
1347 | struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM); | |
1348 | if (elem == NULL) | |
1349 | goto nla_put_failure; | |
1350 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1351 | goto nla_put_failure; | |
1352 | nla_nest_end(skb, elem); | |
1353 | } | |
1354 | nla_nest_end(skb, list); | |
1355 | ||
0768b3b3 PNA |
1356 | if (rule->ulen && |
1357 | nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule))) | |
1358 | goto nla_put_failure; | |
1359 | ||
96518518 PM |
1360 | return nlmsg_end(skb, nlh); |
1361 | ||
1362 | nla_put_failure: | |
1363 | nlmsg_trim(skb, nlh); | |
1364 | return -1; | |
1365 | } | |
1366 | ||
1367 | static int nf_tables_rule_notify(const struct sk_buff *oskb, | |
1368 | const struct nlmsghdr *nlh, | |
1369 | const struct nft_table *table, | |
1370 | const struct nft_chain *chain, | |
1371 | const struct nft_rule *rule, | |
1372 | int event, u32 flags, int family) | |
1373 | { | |
1374 | struct sk_buff *skb; | |
1375 | u32 portid = NETLINK_CB(oskb).portid; | |
1376 | struct net *net = oskb ? sock_net(oskb->sk) : &init_net; | |
1377 | u32 seq = nlh->nlmsg_seq; | |
1378 | bool report; | |
1379 | int err; | |
1380 | ||
1381 | report = nlmsg_report(nlh); | |
1382 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
1383 | return 0; | |
1384 | ||
1385 | err = -ENOBUFS; | |
1386 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1387 | if (skb == NULL) | |
1388 | goto err; | |
1389 | ||
1390 | err = nf_tables_fill_rule_info(skb, portid, seq, event, flags, | |
1391 | family, table, chain, rule); | |
1392 | if (err < 0) { | |
1393 | kfree_skb(skb); | |
1394 | goto err; | |
1395 | } | |
1396 | ||
1397 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
1398 | GFP_KERNEL); | |
1399 | err: | |
1400 | if (err < 0) | |
1401 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
1402 | return err; | |
1403 | } | |
1404 | ||
0628b123 PNA |
1405 | static inline bool |
1406 | nft_rule_is_active(struct net *net, const struct nft_rule *rule) | |
1407 | { | |
1408 | return (rule->genmask & (1 << net->nft.gencursor)) == 0; | |
1409 | } | |
1410 | ||
1411 | static inline int gencursor_next(struct net *net) | |
1412 | { | |
1413 | return net->nft.gencursor+1 == 1 ? 1 : 0; | |
1414 | } | |
1415 | ||
1416 | static inline int | |
1417 | nft_rule_is_active_next(struct net *net, const struct nft_rule *rule) | |
1418 | { | |
1419 | return (rule->genmask & (1 << gencursor_next(net))) == 0; | |
1420 | } | |
1421 | ||
1422 | static inline void | |
1423 | nft_rule_activate_next(struct net *net, struct nft_rule *rule) | |
1424 | { | |
1425 | /* Now inactive, will be active in the future */ | |
1426 | rule->genmask = (1 << net->nft.gencursor); | |
1427 | } | |
1428 | ||
1429 | static inline void | |
1430 | nft_rule_disactivate_next(struct net *net, struct nft_rule *rule) | |
1431 | { | |
1432 | rule->genmask = (1 << gencursor_next(net)); | |
1433 | } | |
1434 | ||
1435 | static inline void nft_rule_clear(struct net *net, struct nft_rule *rule) | |
1436 | { | |
1437 | rule->genmask = 0; | |
1438 | } | |
1439 | ||
96518518 PM |
1440 | static int nf_tables_dump_rules(struct sk_buff *skb, |
1441 | struct netlink_callback *cb) | |
1442 | { | |
1443 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1444 | const struct nft_af_info *afi; | |
1445 | const struct nft_table *table; | |
1446 | const struct nft_chain *chain; | |
1447 | const struct nft_rule *rule; | |
1448 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1449 | struct net *net = sock_net(skb->sk); |
96518518 | 1450 | int family = nfmsg->nfgen_family; |
0628b123 PNA |
1451 | u8 genctr = ACCESS_ONCE(net->nft.genctr); |
1452 | u8 gencursor = ACCESS_ONCE(net->nft.gencursor); | |
96518518 | 1453 | |
99633ab2 | 1454 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
1455 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1456 | continue; | |
1457 | ||
1458 | list_for_each_entry(table, &afi->tables, list) { | |
1459 | list_for_each_entry(chain, &table->chains, list) { | |
1460 | list_for_each_entry(rule, &chain->rules, list) { | |
0628b123 PNA |
1461 | if (!nft_rule_is_active(net, rule)) |
1462 | goto cont; | |
96518518 PM |
1463 | if (idx < s_idx) |
1464 | goto cont; | |
1465 | if (idx > s_idx) | |
1466 | memset(&cb->args[1], 0, | |
1467 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1468 | if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid, | |
1469 | cb->nlh->nlmsg_seq, | |
1470 | NFT_MSG_NEWRULE, | |
1471 | NLM_F_MULTI | NLM_F_APPEND, | |
1472 | afi->family, table, chain, rule) < 0) | |
1473 | goto done; | |
1474 | cont: | |
1475 | idx++; | |
1476 | } | |
1477 | } | |
1478 | } | |
1479 | } | |
1480 | done: | |
0628b123 PNA |
1481 | /* Invalidate this dump, a transition to the new generation happened */ |
1482 | if (gencursor != net->nft.gencursor || genctr != net->nft.genctr) | |
1483 | return -EBUSY; | |
1484 | ||
96518518 PM |
1485 | cb->args[0] = idx; |
1486 | return skb->len; | |
1487 | } | |
1488 | ||
1489 | static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb, | |
1490 | const struct nlmsghdr *nlh, | |
1491 | const struct nlattr * const nla[]) | |
1492 | { | |
1493 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1494 | const struct nft_af_info *afi; | |
1495 | const struct nft_table *table; | |
1496 | const struct nft_chain *chain; | |
1497 | const struct nft_rule *rule; | |
1498 | struct sk_buff *skb2; | |
99633ab2 | 1499 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1500 | int family = nfmsg->nfgen_family; |
1501 | int err; | |
1502 | ||
1503 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1504 | struct netlink_dump_control c = { | |
1505 | .dump = nf_tables_dump_rules, | |
1506 | }; | |
1507 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1508 | } | |
1509 | ||
99633ab2 | 1510 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1511 | if (IS_ERR(afi)) |
1512 | return PTR_ERR(afi); | |
1513 | ||
9370761c | 1514 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1515 | if (IS_ERR(table)) |
1516 | return PTR_ERR(table); | |
1517 | ||
1518 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1519 | if (IS_ERR(chain)) | |
1520 | return PTR_ERR(chain); | |
1521 | ||
1522 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
1523 | if (IS_ERR(rule)) | |
1524 | return PTR_ERR(rule); | |
1525 | ||
1526 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1527 | if (!skb2) | |
1528 | return -ENOMEM; | |
1529 | ||
1530 | err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid, | |
1531 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, | |
1532 | family, table, chain, rule); | |
1533 | if (err < 0) | |
1534 | goto err; | |
1535 | ||
1536 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1537 | ||
1538 | err: | |
1539 | kfree_skb(skb2); | |
1540 | return err; | |
1541 | } | |
1542 | ||
62472bce PM |
1543 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
1544 | struct nft_rule *rule) | |
96518518 | 1545 | { |
96518518 PM |
1546 | struct nft_expr *expr; |
1547 | ||
1548 | /* | |
1549 | * Careful: some expressions might not be initialized in case this | |
1550 | * is called on error from nf_tables_newrule(). | |
1551 | */ | |
1552 | expr = nft_expr_first(rule); | |
1553 | while (expr->ops && expr != nft_expr_last(rule)) { | |
62472bce | 1554 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
1555 | expr = nft_expr_next(expr); |
1556 | } | |
1557 | kfree(rule); | |
1558 | } | |
1559 | ||
96518518 PM |
1560 | #define NFT_RULE_MAXEXPRS 128 |
1561 | ||
1562 | static struct nft_expr_info *info; | |
1563 | ||
0628b123 | 1564 | static struct nft_rule_trans * |
a36e901c | 1565 | nf_tables_trans_add(struct nft_ctx *ctx, struct nft_rule *rule) |
0628b123 PNA |
1566 | { |
1567 | struct nft_rule_trans *rupd; | |
1568 | ||
1569 | rupd = kmalloc(sizeof(struct nft_rule_trans), GFP_KERNEL); | |
1570 | if (rupd == NULL) | |
1571 | return NULL; | |
1572 | ||
62472bce | 1573 | rupd->ctx = *ctx; |
0628b123 | 1574 | rupd->rule = rule; |
0628b123 PNA |
1575 | list_add_tail(&rupd->list, &ctx->net->nft.commit_list); |
1576 | ||
1577 | return rupd; | |
1578 | } | |
1579 | ||
96518518 PM |
1580 | static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, |
1581 | const struct nlmsghdr *nlh, | |
1582 | const struct nlattr * const nla[]) | |
1583 | { | |
1584 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 | 1585 | struct nft_af_info *afi; |
99633ab2 | 1586 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1587 | struct nft_table *table; |
1588 | struct nft_chain *chain; | |
1589 | struct nft_rule *rule, *old_rule = NULL; | |
0628b123 | 1590 | struct nft_rule_trans *repl = NULL; |
96518518 PM |
1591 | struct nft_expr *expr; |
1592 | struct nft_ctx ctx; | |
1593 | struct nlattr *tmp; | |
0768b3b3 | 1594 | unsigned int size, i, n, ulen = 0; |
96518518 PM |
1595 | int err, rem; |
1596 | bool create; | |
5e948466 | 1597 | u64 handle, pos_handle; |
96518518 PM |
1598 | |
1599 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1600 | ||
99633ab2 | 1601 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
1602 | if (IS_ERR(afi)) |
1603 | return PTR_ERR(afi); | |
1604 | ||
9370761c | 1605 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1606 | if (IS_ERR(table)) |
1607 | return PTR_ERR(table); | |
1608 | ||
1609 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1610 | if (IS_ERR(chain)) | |
1611 | return PTR_ERR(chain); | |
1612 | ||
1613 | if (nla[NFTA_RULE_HANDLE]) { | |
1614 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
1615 | rule = __nf_tables_rule_lookup(chain, handle); | |
1616 | if (IS_ERR(rule)) | |
1617 | return PTR_ERR(rule); | |
1618 | ||
1619 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1620 | return -EEXIST; | |
1621 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1622 | old_rule = rule; | |
1623 | else | |
1624 | return -EOPNOTSUPP; | |
1625 | } else { | |
1626 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
1627 | return -EINVAL; | |
1628 | handle = nf_tables_alloc_handle(table); | |
1629 | } | |
1630 | ||
5e948466 EL |
1631 | if (nla[NFTA_RULE_POSITION]) { |
1632 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
1633 | return -EOPNOTSUPP; | |
1634 | ||
1635 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
1636 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
1637 | if (IS_ERR(old_rule)) | |
1638 | return PTR_ERR(old_rule); | |
1639 | } | |
1640 | ||
0ca743a5 PNA |
1641 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1642 | ||
96518518 PM |
1643 | n = 0; |
1644 | size = 0; | |
1645 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
1646 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
1647 | err = -EINVAL; | |
1648 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
1649 | goto err1; | |
1650 | if (n == NFT_RULE_MAXEXPRS) | |
1651 | goto err1; | |
0ca743a5 | 1652 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
1653 | if (err < 0) |
1654 | goto err1; | |
1655 | size += info[n].ops->size; | |
1656 | n++; | |
1657 | } | |
1658 | } | |
1659 | ||
0768b3b3 PNA |
1660 | if (nla[NFTA_RULE_USERDATA]) |
1661 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); | |
1662 | ||
96518518 | 1663 | err = -ENOMEM; |
0768b3b3 | 1664 | rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL); |
96518518 PM |
1665 | if (rule == NULL) |
1666 | goto err1; | |
1667 | ||
0628b123 PNA |
1668 | nft_rule_activate_next(net, rule); |
1669 | ||
96518518 PM |
1670 | rule->handle = handle; |
1671 | rule->dlen = size; | |
0768b3b3 PNA |
1672 | rule->ulen = ulen; |
1673 | ||
1674 | if (ulen) | |
1675 | nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen); | |
96518518 | 1676 | |
96518518 PM |
1677 | expr = nft_expr_first(rule); |
1678 | for (i = 0; i < n; i++) { | |
1679 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
1680 | if (err < 0) | |
1681 | goto err2; | |
ef1f7df9 | 1682 | info[i].ops = NULL; |
96518518 PM |
1683 | expr = nft_expr_next(expr); |
1684 | } | |
1685 | ||
96518518 | 1686 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
0628b123 | 1687 | if (nft_rule_is_active_next(net, old_rule)) { |
a36e901c | 1688 | repl = nf_tables_trans_add(&ctx, old_rule); |
0628b123 PNA |
1689 | if (repl == NULL) { |
1690 | err = -ENOMEM; | |
1691 | goto err2; | |
1692 | } | |
1693 | nft_rule_disactivate_next(net, old_rule); | |
1694 | list_add_tail(&rule->list, &old_rule->list); | |
1695 | } else { | |
1696 | err = -ENOENT; | |
1697 | goto err2; | |
1698 | } | |
96518518 | 1699 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
1700 | if (old_rule) |
1701 | list_add_rcu(&rule->list, &old_rule->list); | |
1702 | else | |
1703 | list_add_tail_rcu(&rule->list, &chain->rules); | |
1704 | else { | |
1705 | if (old_rule) | |
1706 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
1707 | else | |
1708 | list_add_rcu(&rule->list, &chain->rules); | |
1709 | } | |
96518518 | 1710 | |
a36e901c | 1711 | if (nf_tables_trans_add(&ctx, rule) == NULL) { |
0628b123 PNA |
1712 | err = -ENOMEM; |
1713 | goto err3; | |
1714 | } | |
96518518 PM |
1715 | return 0; |
1716 | ||
0628b123 PNA |
1717 | err3: |
1718 | list_del_rcu(&rule->list); | |
1719 | if (repl) { | |
1720 | list_del_rcu(&repl->rule->list); | |
1721 | list_del(&repl->list); | |
1722 | nft_rule_clear(net, repl->rule); | |
1723 | kfree(repl); | |
1724 | } | |
96518518 | 1725 | err2: |
62472bce | 1726 | nf_tables_rule_destroy(&ctx, rule); |
96518518 PM |
1727 | err1: |
1728 | for (i = 0; i < n; i++) { | |
1729 | if (info[i].ops != NULL) | |
ef1f7df9 | 1730 | module_put(info[i].ops->type->owner); |
96518518 PM |
1731 | } |
1732 | return err; | |
1733 | } | |
1734 | ||
0628b123 PNA |
1735 | static int |
1736 | nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule) | |
1737 | { | |
1738 | /* You cannot delete the same rule twice */ | |
1739 | if (nft_rule_is_active_next(ctx->net, rule)) { | |
a36e901c | 1740 | if (nf_tables_trans_add(ctx, rule) == NULL) |
0628b123 PNA |
1741 | return -ENOMEM; |
1742 | nft_rule_disactivate_next(ctx->net, rule); | |
1743 | return 0; | |
1744 | } | |
1745 | return -ENOENT; | |
1746 | } | |
1747 | ||
cf9dc09d PNA |
1748 | static int nf_table_delrule_by_chain(struct nft_ctx *ctx) |
1749 | { | |
1750 | struct nft_rule *rule; | |
1751 | int err; | |
1752 | ||
1753 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
1754 | err = nf_tables_delrule_one(ctx, rule); | |
1755 | if (err < 0) | |
1756 | return err; | |
1757 | } | |
1758 | return 0; | |
1759 | } | |
1760 | ||
96518518 PM |
1761 | static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb, |
1762 | const struct nlmsghdr *nlh, | |
1763 | const struct nlattr * const nla[]) | |
1764 | { | |
1765 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 | 1766 | struct nft_af_info *afi; |
99633ab2 | 1767 | struct net *net = sock_net(skb->sk); |
7c95f6d8 | 1768 | struct nft_table *table; |
cf9dc09d PNA |
1769 | struct nft_chain *chain = NULL; |
1770 | struct nft_rule *rule; | |
0628b123 PNA |
1771 | int family = nfmsg->nfgen_family, err = 0; |
1772 | struct nft_ctx ctx; | |
96518518 | 1773 | |
99633ab2 | 1774 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1775 | if (IS_ERR(afi)) |
1776 | return PTR_ERR(afi); | |
1777 | ||
9370761c | 1778 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1779 | if (IS_ERR(table)) |
1780 | return PTR_ERR(table); | |
1781 | ||
cf9dc09d PNA |
1782 | if (nla[NFTA_RULE_CHAIN]) { |
1783 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1784 | if (IS_ERR(chain)) | |
1785 | return PTR_ERR(chain); | |
1786 | } | |
96518518 | 1787 | |
0628b123 PNA |
1788 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1789 | ||
cf9dc09d PNA |
1790 | if (chain) { |
1791 | if (nla[NFTA_RULE_HANDLE]) { | |
1792 | rule = nf_tables_rule_lookup(chain, | |
1793 | nla[NFTA_RULE_HANDLE]); | |
1794 | if (IS_ERR(rule)) | |
1795 | return PTR_ERR(rule); | |
96518518 | 1796 | |
0628b123 | 1797 | err = nf_tables_delrule_one(&ctx, rule); |
cf9dc09d PNA |
1798 | } else { |
1799 | err = nf_table_delrule_by_chain(&ctx); | |
1800 | } | |
1801 | } else { | |
1802 | list_for_each_entry(chain, &table->chains, list) { | |
1803 | ctx.chain = chain; | |
1804 | err = nf_table_delrule_by_chain(&ctx); | |
0628b123 PNA |
1805 | if (err < 0) |
1806 | break; | |
1807 | } | |
1808 | } | |
1809 | ||
1810 | return err; | |
1811 | } | |
1812 | ||
1813 | static int nf_tables_commit(struct sk_buff *skb) | |
1814 | { | |
1815 | struct net *net = sock_net(skb->sk); | |
1816 | struct nft_rule_trans *rupd, *tmp; | |
96518518 | 1817 | |
0628b123 PNA |
1818 | /* Bump generation counter, invalidate any dump in progress */ |
1819 | net->nft.genctr++; | |
1820 | ||
1821 | /* A new generation has just started */ | |
1822 | net->nft.gencursor = gencursor_next(net); | |
1823 | ||
1824 | /* Make sure all packets have left the previous generation before | |
1825 | * purging old rules. | |
1826 | */ | |
1827 | synchronize_rcu(); | |
1828 | ||
1829 | list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { | |
0628b123 PNA |
1830 | /* This rule was inactive in the past and just became active. |
1831 | * Clear the next bit of the genmask since its meaning has | |
1832 | * changed, now it is the future. | |
1833 | */ | |
1834 | if (nft_rule_is_active(net, rupd->rule)) { | |
1835 | nft_rule_clear(net, rupd->rule); | |
62472bce PM |
1836 | nf_tables_rule_notify(skb, rupd->ctx.nlh, |
1837 | rupd->ctx.table, rupd->ctx.chain, | |
1838 | rupd->rule, NFT_MSG_NEWRULE, 0, | |
1839 | rupd->ctx.afi->family); | |
0165d932 | 1840 | list_del(&rupd->list); |
0628b123 PNA |
1841 | kfree(rupd); |
1842 | continue; | |
96518518 | 1843 | } |
0628b123 PNA |
1844 | |
1845 | /* This rule is in the past, get rid of it */ | |
1846 | list_del_rcu(&rupd->rule->list); | |
62472bce PM |
1847 | nf_tables_rule_notify(skb, rupd->ctx.nlh, |
1848 | rupd->ctx.table, rupd->ctx.chain, | |
0628b123 | 1849 | rupd->rule, NFT_MSG_DELRULE, 0, |
62472bce | 1850 | rupd->ctx.afi->family); |
0165d932 PNA |
1851 | } |
1852 | ||
1853 | /* Make sure we don't see any packet traversing old rules */ | |
1854 | synchronize_rcu(); | |
1855 | ||
1856 | /* Now we can safely release unused old rules */ | |
1857 | list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { | |
62472bce | 1858 | nf_tables_rule_destroy(&rupd->ctx, rupd->rule); |
0165d932 | 1859 | list_del(&rupd->list); |
0628b123 | 1860 | kfree(rupd); |
96518518 PM |
1861 | } |
1862 | ||
96518518 PM |
1863 | return 0; |
1864 | } | |
1865 | ||
0628b123 PNA |
1866 | static int nf_tables_abort(struct sk_buff *skb) |
1867 | { | |
1868 | struct net *net = sock_net(skb->sk); | |
1869 | struct nft_rule_trans *rupd, *tmp; | |
1870 | ||
1871 | list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { | |
0628b123 PNA |
1872 | if (!nft_rule_is_active_next(net, rupd->rule)) { |
1873 | nft_rule_clear(net, rupd->rule); | |
0165d932 | 1874 | list_del(&rupd->list); |
0628b123 PNA |
1875 | kfree(rupd); |
1876 | continue; | |
1877 | } | |
1878 | ||
1879 | /* This rule is inactive, get rid of it */ | |
1880 | list_del_rcu(&rupd->rule->list); | |
0165d932 PNA |
1881 | } |
1882 | ||
1883 | /* Make sure we don't see any packet accessing aborted rules */ | |
1884 | synchronize_rcu(); | |
1885 | ||
1886 | list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { | |
62472bce | 1887 | nf_tables_rule_destroy(&rupd->ctx, rupd->rule); |
0165d932 | 1888 | list_del(&rupd->list); |
0628b123 PNA |
1889 | kfree(rupd); |
1890 | } | |
0165d932 | 1891 | |
0628b123 PNA |
1892 | return 0; |
1893 | } | |
1894 | ||
20a69341 PM |
1895 | /* |
1896 | * Sets | |
1897 | */ | |
1898 | ||
1899 | static LIST_HEAD(nf_tables_set_ops); | |
1900 | ||
1901 | int nft_register_set(struct nft_set_ops *ops) | |
1902 | { | |
1903 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1904 | list_add_tail(&ops->list, &nf_tables_set_ops); | |
1905 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1906 | return 0; | |
1907 | } | |
1908 | EXPORT_SYMBOL_GPL(nft_register_set); | |
1909 | ||
1910 | void nft_unregister_set(struct nft_set_ops *ops) | |
1911 | { | |
1912 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1913 | list_del(&ops->list); | |
1914 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1915 | } | |
1916 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
1917 | ||
c50b960c PM |
1918 | /* |
1919 | * Select a set implementation based on the data characteristics and the | |
1920 | * given policy. The total memory use might not be known if no size is | |
1921 | * given, in that case the amount of memory per element is used. | |
1922 | */ | |
1923 | static const struct nft_set_ops * | |
1924 | nft_select_set_ops(const struct nlattr * const nla[], | |
1925 | const struct nft_set_desc *desc, | |
1926 | enum nft_set_policies policy) | |
20a69341 | 1927 | { |
c50b960c PM |
1928 | const struct nft_set_ops *ops, *bops; |
1929 | struct nft_set_estimate est, best; | |
20a69341 PM |
1930 | u32 features; |
1931 | ||
1932 | #ifdef CONFIG_MODULES | |
1933 | if (list_empty(&nf_tables_set_ops)) { | |
1934 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1935 | request_module("nft-set"); | |
1936 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1937 | if (!list_empty(&nf_tables_set_ops)) | |
1938 | return ERR_PTR(-EAGAIN); | |
1939 | } | |
1940 | #endif | |
1941 | features = 0; | |
1942 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
1943 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
1944 | features &= NFT_SET_INTERVAL | NFT_SET_MAP; | |
1945 | } | |
1946 | ||
c50b960c PM |
1947 | bops = NULL; |
1948 | best.size = ~0; | |
1949 | best.class = ~0; | |
1950 | ||
20a69341 PM |
1951 | list_for_each_entry(ops, &nf_tables_set_ops, list) { |
1952 | if ((ops->features & features) != features) | |
1953 | continue; | |
c50b960c PM |
1954 | if (!ops->estimate(desc, features, &est)) |
1955 | continue; | |
1956 | ||
1957 | switch (policy) { | |
1958 | case NFT_SET_POL_PERFORMANCE: | |
1959 | if (est.class < best.class) | |
1960 | break; | |
1961 | if (est.class == best.class && est.size < best.size) | |
1962 | break; | |
1963 | continue; | |
1964 | case NFT_SET_POL_MEMORY: | |
1965 | if (est.size < best.size) | |
1966 | break; | |
1967 | if (est.size == best.size && est.class < best.class) | |
1968 | break; | |
1969 | continue; | |
1970 | default: | |
1971 | break; | |
1972 | } | |
1973 | ||
20a69341 PM |
1974 | if (!try_module_get(ops->owner)) |
1975 | continue; | |
c50b960c PM |
1976 | if (bops != NULL) |
1977 | module_put(bops->owner); | |
1978 | ||
1979 | bops = ops; | |
1980 | best = est; | |
20a69341 PM |
1981 | } |
1982 | ||
c50b960c PM |
1983 | if (bops != NULL) |
1984 | return bops; | |
1985 | ||
20a69341 PM |
1986 | return ERR_PTR(-EOPNOTSUPP); |
1987 | } | |
1988 | ||
1989 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
1990 | [NFTA_SET_TABLE] = { .type = NLA_STRING }, | |
1991 | [NFTA_SET_NAME] = { .type = NLA_STRING }, | |
1992 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, | |
1993 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
1994 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
1995 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
1996 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
1997 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
1998 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
1999 | }; | |
2000 | ||
2001 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2002 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2003 | }; |
2004 | ||
2005 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, | |
2006 | const struct sk_buff *skb, | |
2007 | const struct nlmsghdr *nlh, | |
2008 | const struct nlattr * const nla[]) | |
2009 | { | |
99633ab2 | 2010 | struct net *net = sock_net(skb->sk); |
20a69341 | 2011 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7c95f6d8 PNA |
2012 | struct nft_af_info *afi = NULL; |
2013 | struct nft_table *table = NULL; | |
20a69341 | 2014 | |
c9c8e485 PNA |
2015 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
2016 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
2017 | if (IS_ERR(afi)) | |
2018 | return PTR_ERR(afi); | |
2019 | } | |
20a69341 PM |
2020 | |
2021 | if (nla[NFTA_SET_TABLE] != NULL) { | |
ec2c9935 PM |
2022 | if (afi == NULL) |
2023 | return -EAFNOSUPPORT; | |
2024 | ||
9370761c | 2025 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
2026 | if (IS_ERR(table)) |
2027 | return PTR_ERR(table); | |
2028 | } | |
2029 | ||
0ca743a5 | 2030 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2031 | return 0; |
2032 | } | |
2033 | ||
2034 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, | |
2035 | const struct nlattr *nla) | |
2036 | { | |
2037 | struct nft_set *set; | |
2038 | ||
2039 | if (nla == NULL) | |
2040 | return ERR_PTR(-EINVAL); | |
2041 | ||
2042 | list_for_each_entry(set, &table->sets, list) { | |
2043 | if (!nla_strcmp(nla, set->name)) | |
2044 | return set; | |
2045 | } | |
2046 | return ERR_PTR(-ENOENT); | |
2047 | } | |
2048 | ||
2049 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, | |
2050 | const char *name) | |
2051 | { | |
2052 | const struct nft_set *i; | |
2053 | const char *p; | |
2054 | unsigned long *inuse; | |
60eb1894 | 2055 | unsigned int n = 0, min = 0; |
20a69341 PM |
2056 | |
2057 | p = strnchr(name, IFNAMSIZ, '%'); | |
2058 | if (p != NULL) { | |
2059 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2060 | return -EINVAL; | |
2061 | ||
2062 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2063 | if (inuse == NULL) | |
2064 | return -ENOMEM; | |
60eb1894 | 2065 | cont: |
20a69341 | 2066 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2067 | int tmp; |
2068 | ||
2069 | if (!sscanf(i->name, name, &tmp)) | |
20a69341 | 2070 | continue; |
60eb1894 | 2071 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2072 | continue; |
14662917 | 2073 | |
60eb1894 | 2074 | set_bit(tmp - min, inuse); |
20a69341 PM |
2075 | } |
2076 | ||
53b70287 | 2077 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2078 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2079 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2080 | memset(inuse, 0, PAGE_SIZE); | |
2081 | goto cont; | |
2082 | } | |
20a69341 PM |
2083 | free_page((unsigned long)inuse); |
2084 | } | |
2085 | ||
60eb1894 | 2086 | snprintf(set->name, sizeof(set->name), name, min + n); |
20a69341 PM |
2087 | list_for_each_entry(i, &ctx->table->sets, list) { |
2088 | if (!strcmp(set->name, i->name)) | |
2089 | return -ENFILE; | |
2090 | } | |
2091 | return 0; | |
2092 | } | |
2093 | ||
2094 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2095 | const struct nft_set *set, u16 event, u16 flags) | |
2096 | { | |
2097 | struct nfgenmsg *nfmsg; | |
2098 | struct nlmsghdr *nlh; | |
c50b960c | 2099 | struct nlattr *desc; |
20a69341 PM |
2100 | u32 portid = NETLINK_CB(ctx->skb).portid; |
2101 | u32 seq = ctx->nlh->nlmsg_seq; | |
2102 | ||
2103 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2104 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2105 | flags); | |
2106 | if (nlh == NULL) | |
2107 | goto nla_put_failure; | |
2108 | ||
2109 | nfmsg = nlmsg_data(nlh); | |
2110 | nfmsg->nfgen_family = ctx->afi->family; | |
2111 | nfmsg->version = NFNETLINK_V0; | |
2112 | nfmsg->res_id = 0; | |
2113 | ||
2114 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2115 | goto nla_put_failure; | |
2116 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2117 | goto nla_put_failure; | |
2118 | if (set->flags != 0) | |
2119 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2120 | goto nla_put_failure; | |
2121 | ||
2122 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2123 | goto nla_put_failure; | |
2124 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2125 | goto nla_put_failure; | |
2126 | if (set->flags & NFT_SET_MAP) { | |
2127 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2128 | goto nla_put_failure; | |
2129 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2130 | goto nla_put_failure; | |
2131 | } | |
2132 | ||
c50b960c PM |
2133 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
2134 | if (desc == NULL) | |
2135 | goto nla_put_failure; | |
2136 | if (set->size && | |
2137 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
2138 | goto nla_put_failure; | |
2139 | nla_nest_end(skb, desc); | |
2140 | ||
20a69341 PM |
2141 | return nlmsg_end(skb, nlh); |
2142 | ||
2143 | nla_put_failure: | |
2144 | nlmsg_trim(skb, nlh); | |
2145 | return -1; | |
2146 | } | |
2147 | ||
2148 | static int nf_tables_set_notify(const struct nft_ctx *ctx, | |
2149 | const struct nft_set *set, | |
2150 | int event) | |
2151 | { | |
2152 | struct sk_buff *skb; | |
2153 | u32 portid = NETLINK_CB(ctx->skb).portid; | |
20a69341 PM |
2154 | bool report; |
2155 | int err; | |
2156 | ||
2157 | report = nlmsg_report(ctx->nlh); | |
99633ab2 | 2158 | if (!report && !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
20a69341 PM |
2159 | return 0; |
2160 | ||
2161 | err = -ENOBUFS; | |
2162 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2163 | if (skb == NULL) | |
2164 | goto err; | |
2165 | ||
2166 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2167 | if (err < 0) { | |
2168 | kfree_skb(skb); | |
2169 | goto err; | |
2170 | } | |
2171 | ||
99633ab2 | 2172 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, report, |
20a69341 PM |
2173 | GFP_KERNEL); |
2174 | err: | |
2175 | if (err < 0) | |
99633ab2 | 2176 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
20a69341 PM |
2177 | return err; |
2178 | } | |
2179 | ||
2180 | static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb, | |
2181 | struct netlink_callback *cb) | |
2182 | { | |
2183 | const struct nft_set *set; | |
2184 | unsigned int idx = 0, s_idx = cb->args[0]; | |
2185 | ||
2186 | if (cb->args[1]) | |
2187 | return skb->len; | |
2188 | ||
2189 | list_for_each_entry(set, &ctx->table->sets, list) { | |
2190 | if (idx < s_idx) | |
2191 | goto cont; | |
2192 | if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, | |
2193 | NLM_F_MULTI) < 0) { | |
2194 | cb->args[0] = idx; | |
2195 | goto done; | |
2196 | } | |
2197 | cont: | |
2198 | idx++; | |
2199 | } | |
2200 | cb->args[1] = 1; | |
2201 | done: | |
2202 | return skb->len; | |
2203 | } | |
2204 | ||
c9c8e485 PNA |
2205 | static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb, |
2206 | struct netlink_callback *cb) | |
20a69341 PM |
2207 | { |
2208 | const struct nft_set *set; | |
e38195bf | 2209 | unsigned int idx, s_idx = cb->args[0]; |
20a69341 PM |
2210 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2211 | ||
2212 | if (cb->args[1]) | |
2213 | return skb->len; | |
2214 | ||
2215 | list_for_each_entry(table, &ctx->afi->tables, list) { | |
e38195bf PNA |
2216 | if (cur_table) { |
2217 | if (cur_table != table) | |
2218 | continue; | |
20a69341 | 2219 | |
e38195bf PNA |
2220 | cur_table = NULL; |
2221 | } | |
20a69341 | 2222 | ctx->table = table; |
e38195bf | 2223 | idx = 0; |
20a69341 PM |
2224 | list_for_each_entry(set, &ctx->table->sets, list) { |
2225 | if (idx < s_idx) | |
2226 | goto cont; | |
2227 | if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, | |
2228 | NLM_F_MULTI) < 0) { | |
2229 | cb->args[0] = idx; | |
2230 | cb->args[2] = (unsigned long) table; | |
2231 | goto done; | |
2232 | } | |
2233 | cont: | |
2234 | idx++; | |
2235 | } | |
2236 | } | |
2237 | cb->args[1] = 1; | |
2238 | done: | |
2239 | return skb->len; | |
2240 | } | |
2241 | ||
c9c8e485 PNA |
2242 | static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb, |
2243 | struct netlink_callback *cb) | |
2244 | { | |
2245 | const struct nft_set *set; | |
2246 | unsigned int idx, s_idx = cb->args[0]; | |
7c95f6d8 | 2247 | struct nft_af_info *afi; |
c9c8e485 PNA |
2248 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2249 | struct net *net = sock_net(skb->sk); | |
2250 | int cur_family = cb->args[3]; | |
2251 | ||
2252 | if (cb->args[1]) | |
2253 | return skb->len; | |
2254 | ||
2255 | list_for_each_entry(afi, &net->nft.af_info, list) { | |
2256 | if (cur_family) { | |
2257 | if (afi->family != cur_family) | |
2258 | continue; | |
2259 | ||
2260 | cur_family = 0; | |
2261 | } | |
2262 | ||
2263 | list_for_each_entry(table, &afi->tables, list) { | |
2264 | if (cur_table) { | |
2265 | if (cur_table != table) | |
2266 | continue; | |
2267 | ||
2268 | cur_table = NULL; | |
2269 | } | |
2270 | ||
2271 | ctx->table = table; | |
2272 | ctx->afi = afi; | |
2273 | idx = 0; | |
2274 | list_for_each_entry(set, &ctx->table->sets, list) { | |
2275 | if (idx < s_idx) | |
2276 | goto cont; | |
2277 | if (nf_tables_fill_set(skb, ctx, set, | |
2278 | NFT_MSG_NEWSET, | |
2279 | NLM_F_MULTI) < 0) { | |
2280 | cb->args[0] = idx; | |
2281 | cb->args[2] = (unsigned long) table; | |
2282 | cb->args[3] = afi->family; | |
2283 | goto done; | |
2284 | } | |
2285 | cont: | |
2286 | idx++; | |
2287 | } | |
2288 | if (s_idx) | |
2289 | s_idx = 0; | |
2290 | } | |
2291 | } | |
2292 | cb->args[1] = 1; | |
2293 | done: | |
2294 | return skb->len; | |
2295 | } | |
2296 | ||
20a69341 PM |
2297 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
2298 | { | |
2299 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
2300 | struct nlattr *nla[NFTA_SET_MAX + 1]; | |
2301 | struct nft_ctx ctx; | |
2302 | int err, ret; | |
2303 | ||
2304 | err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX, | |
2305 | nft_set_policy); | |
2306 | if (err < 0) | |
2307 | return err; | |
2308 | ||
2309 | err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla); | |
2310 | if (err < 0) | |
2311 | return err; | |
2312 | ||
c9c8e485 PNA |
2313 | if (ctx.table == NULL) { |
2314 | if (ctx.afi == NULL) | |
2315 | ret = nf_tables_dump_sets_all(&ctx, skb, cb); | |
2316 | else | |
2317 | ret = nf_tables_dump_sets_family(&ctx, skb, cb); | |
2318 | } else | |
20a69341 PM |
2319 | ret = nf_tables_dump_sets_table(&ctx, skb, cb); |
2320 | ||
2321 | return ret; | |
2322 | } | |
2323 | ||
2324 | static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb, | |
2325 | const struct nlmsghdr *nlh, | |
2326 | const struct nlattr * const nla[]) | |
2327 | { | |
2328 | const struct nft_set *set; | |
2329 | struct nft_ctx ctx; | |
2330 | struct sk_buff *skb2; | |
c9c8e485 | 2331 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2332 | int err; |
2333 | ||
2334 | /* Verify existance before starting dump */ | |
2335 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); | |
2336 | if (err < 0) | |
2337 | return err; | |
2338 | ||
2339 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2340 | struct netlink_dump_control c = { | |
2341 | .dump = nf_tables_dump_sets, | |
2342 | }; | |
2343 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
2344 | } | |
2345 | ||
c9c8e485 PNA |
2346 | /* Only accept unspec with dump */ |
2347 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2348 | return -EAFNOSUPPORT; | |
2349 | ||
20a69341 PM |
2350 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
2351 | if (IS_ERR(set)) | |
2352 | return PTR_ERR(set); | |
2353 | ||
2354 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2355 | if (skb2 == NULL) | |
2356 | return -ENOMEM; | |
2357 | ||
2358 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2359 | if (err < 0) | |
2360 | goto err; | |
2361 | ||
2362 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2363 | ||
2364 | err: | |
2365 | kfree_skb(skb2); | |
2366 | return err; | |
2367 | } | |
2368 | ||
c50b960c PM |
2369 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
2370 | struct nft_set_desc *desc, | |
2371 | const struct nlattr *nla) | |
2372 | { | |
2373 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
2374 | int err; | |
2375 | ||
2376 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy); | |
2377 | if (err < 0) | |
2378 | return err; | |
2379 | ||
2380 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
2381 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
2382 | ||
2383 | return 0; | |
2384 | } | |
2385 | ||
20a69341 PM |
2386 | static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb, |
2387 | const struct nlmsghdr *nlh, | |
2388 | const struct nlattr * const nla[]) | |
2389 | { | |
2390 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
2391 | const struct nft_set_ops *ops; | |
7c95f6d8 | 2392 | struct nft_af_info *afi; |
99633ab2 | 2393 | struct net *net = sock_net(skb->sk); |
20a69341 PM |
2394 | struct nft_table *table; |
2395 | struct nft_set *set; | |
2396 | struct nft_ctx ctx; | |
2397 | char name[IFNAMSIZ]; | |
2398 | unsigned int size; | |
2399 | bool create; | |
c50b960c PM |
2400 | u32 ktype, dtype, flags, policy; |
2401 | struct nft_set_desc desc; | |
20a69341 PM |
2402 | int err; |
2403 | ||
2404 | if (nla[NFTA_SET_TABLE] == NULL || | |
2405 | nla[NFTA_SET_NAME] == NULL || | |
2406 | nla[NFTA_SET_KEY_LEN] == NULL) | |
2407 | return -EINVAL; | |
2408 | ||
c50b960c PM |
2409 | memset(&desc, 0, sizeof(desc)); |
2410 | ||
20a69341 PM |
2411 | ktype = NFT_DATA_VALUE; |
2412 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
2413 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
2414 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
2415 | return -EINVAL; | |
2416 | } | |
2417 | ||
c50b960c PM |
2418 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
2419 | if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data)) | |
20a69341 PM |
2420 | return -EINVAL; |
2421 | ||
2422 | flags = 0; | |
2423 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2424 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
2425 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
2426 | NFT_SET_INTERVAL | NFT_SET_MAP)) | |
2427 | return -EINVAL; | |
2428 | } | |
2429 | ||
2430 | dtype = 0; | |
20a69341 PM |
2431 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
2432 | if (!(flags & NFT_SET_MAP)) | |
2433 | return -EINVAL; | |
2434 | ||
2435 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
2436 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
2437 | dtype != NFT_DATA_VERDICT) | |
2438 | return -EINVAL; | |
2439 | ||
2440 | if (dtype != NFT_DATA_VERDICT) { | |
2441 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
2442 | return -EINVAL; | |
c50b960c PM |
2443 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
2444 | if (desc.dlen == 0 || | |
2445 | desc.dlen > FIELD_SIZEOF(struct nft_data, data)) | |
20a69341 PM |
2446 | return -EINVAL; |
2447 | } else | |
c50b960c | 2448 | desc.dlen = sizeof(struct nft_data); |
20a69341 PM |
2449 | } else if (flags & NFT_SET_MAP) |
2450 | return -EINVAL; | |
2451 | ||
c50b960c PM |
2452 | policy = NFT_SET_POL_PERFORMANCE; |
2453 | if (nla[NFTA_SET_POLICY] != NULL) | |
2454 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
2455 | ||
2456 | if (nla[NFTA_SET_DESC] != NULL) { | |
2457 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
2458 | if (err < 0) | |
2459 | return err; | |
2460 | } | |
2461 | ||
20a69341 PM |
2462 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
2463 | ||
99633ab2 | 2464 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
2465 | if (IS_ERR(afi)) |
2466 | return PTR_ERR(afi); | |
2467 | ||
9370761c | 2468 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
2469 | if (IS_ERR(table)) |
2470 | return PTR_ERR(table); | |
2471 | ||
0ca743a5 | 2472 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2473 | |
2474 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); | |
2475 | if (IS_ERR(set)) { | |
2476 | if (PTR_ERR(set) != -ENOENT) | |
2477 | return PTR_ERR(set); | |
2478 | set = NULL; | |
2479 | } | |
2480 | ||
2481 | if (set != NULL) { | |
2482 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2483 | return -EEXIST; | |
2484 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2485 | return -EOPNOTSUPP; | |
2486 | return 0; | |
2487 | } | |
2488 | ||
2489 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2490 | return -ENOENT; | |
2491 | ||
c50b960c | 2492 | ops = nft_select_set_ops(nla, &desc, policy); |
20a69341 PM |
2493 | if (IS_ERR(ops)) |
2494 | return PTR_ERR(ops); | |
2495 | ||
2496 | size = 0; | |
2497 | if (ops->privsize != NULL) | |
2498 | size = ops->privsize(nla); | |
2499 | ||
2500 | err = -ENOMEM; | |
2501 | set = kzalloc(sizeof(*set) + size, GFP_KERNEL); | |
2502 | if (set == NULL) | |
2503 | goto err1; | |
2504 | ||
2505 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); | |
2506 | err = nf_tables_set_alloc_name(&ctx, set, name); | |
2507 | if (err < 0) | |
2508 | goto err2; | |
2509 | ||
2510 | INIT_LIST_HEAD(&set->bindings); | |
2511 | set->ops = ops; | |
2512 | set->ktype = ktype; | |
c50b960c | 2513 | set->klen = desc.klen; |
20a69341 | 2514 | set->dtype = dtype; |
c50b960c | 2515 | set->dlen = desc.dlen; |
20a69341 | 2516 | set->flags = flags; |
c50b960c | 2517 | set->size = desc.size; |
20a69341 | 2518 | |
c50b960c | 2519 | err = ops->init(set, &desc, nla); |
20a69341 PM |
2520 | if (err < 0) |
2521 | goto err2; | |
2522 | ||
2523 | list_add_tail(&set->list, &table->sets); | |
2524 | nf_tables_set_notify(&ctx, set, NFT_MSG_NEWSET); | |
2525 | return 0; | |
2526 | ||
2527 | err2: | |
2528 | kfree(set); | |
2529 | err1: | |
2530 | module_put(ops->owner); | |
2531 | return err; | |
2532 | } | |
2533 | ||
2534 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) | |
2535 | { | |
2536 | list_del(&set->list); | |
ab9da5c1 | 2537 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET); |
20a69341 PM |
2538 | |
2539 | set->ops->destroy(set); | |
2540 | module_put(set->ops->owner); | |
2541 | kfree(set); | |
2542 | } | |
2543 | ||
2544 | static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb, | |
2545 | const struct nlmsghdr *nlh, | |
2546 | const struct nlattr * const nla[]) | |
2547 | { | |
c9c8e485 | 2548 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2549 | struct nft_set *set; |
2550 | struct nft_ctx ctx; | |
2551 | int err; | |
2552 | ||
ec2c9935 PM |
2553 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
2554 | return -EAFNOSUPPORT; | |
20a69341 PM |
2555 | if (nla[NFTA_SET_TABLE] == NULL) |
2556 | return -EINVAL; | |
2557 | ||
2558 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); | |
2559 | if (err < 0) | |
2560 | return err; | |
2561 | ||
2562 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); | |
2563 | if (IS_ERR(set)) | |
2564 | return PTR_ERR(set); | |
2565 | if (!list_empty(&set->bindings)) | |
2566 | return -EBUSY; | |
2567 | ||
2568 | nf_tables_set_destroy(&ctx, set); | |
2569 | return 0; | |
2570 | } | |
2571 | ||
2572 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
2573 | const struct nft_set *set, | |
2574 | const struct nft_set_iter *iter, | |
2575 | const struct nft_set_elem *elem) | |
2576 | { | |
2577 | enum nft_registers dreg; | |
2578 | ||
2579 | dreg = nft_type_to_reg(set->dtype); | |
2ee0d3c8 PNA |
2580 | return nft_validate_data_load(ctx, dreg, &elem->data, |
2581 | set->dtype == NFT_DATA_VERDICT ? | |
2582 | NFT_DATA_VERDICT : NFT_DATA_VALUE); | |
20a69341 PM |
2583 | } |
2584 | ||
2585 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2586 | struct nft_set_binding *binding) | |
2587 | { | |
2588 | struct nft_set_binding *i; | |
2589 | struct nft_set_iter iter; | |
2590 | ||
2591 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
2592 | return -EBUSY; | |
2593 | ||
2594 | if (set->flags & NFT_SET_MAP) { | |
2595 | /* If the set is already bound to the same chain all | |
2596 | * jumps are already validated for that chain. | |
2597 | */ | |
2598 | list_for_each_entry(i, &set->bindings, list) { | |
2599 | if (i->chain == binding->chain) | |
2600 | goto bind; | |
2601 | } | |
2602 | ||
2603 | iter.skip = 0; | |
2604 | iter.count = 0; | |
2605 | iter.err = 0; | |
2606 | iter.fn = nf_tables_bind_check_setelem; | |
2607 | ||
2608 | set->ops->walk(ctx, set, &iter); | |
2609 | if (iter.err < 0) { | |
2610 | /* Destroy anonymous sets if binding fails */ | |
2611 | if (set->flags & NFT_SET_ANONYMOUS) | |
2612 | nf_tables_set_destroy(ctx, set); | |
2613 | ||
2614 | return iter.err; | |
2615 | } | |
2616 | } | |
2617 | bind: | |
2618 | binding->chain = ctx->chain; | |
2619 | list_add_tail(&binding->list, &set->bindings); | |
2620 | return 0; | |
2621 | } | |
2622 | ||
2623 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2624 | struct nft_set_binding *binding) | |
2625 | { | |
2626 | list_del(&binding->list); | |
2627 | ||
2628 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
2629 | nf_tables_set_destroy(ctx, set); | |
2630 | } | |
2631 | ||
2632 | /* | |
2633 | * Set elements | |
2634 | */ | |
2635 | ||
2636 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
2637 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
2638 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
2639 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
2640 | }; | |
2641 | ||
2642 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
2643 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING }, | |
2644 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING }, | |
2645 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, | |
2646 | }; | |
2647 | ||
2648 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, | |
2649 | const struct sk_buff *skb, | |
2650 | const struct nlmsghdr *nlh, | |
2651 | const struct nlattr * const nla[]) | |
2652 | { | |
2653 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
2654 | struct nft_af_info *afi; |
2655 | struct nft_table *table; | |
99633ab2 | 2656 | struct net *net = sock_net(skb->sk); |
20a69341 | 2657 | |
99633ab2 | 2658 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
2659 | if (IS_ERR(afi)) |
2660 | return PTR_ERR(afi); | |
2661 | ||
9370761c | 2662 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]); |
20a69341 PM |
2663 | if (IS_ERR(table)) |
2664 | return PTR_ERR(table); | |
2665 | ||
0ca743a5 | 2666 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2667 | return 0; |
2668 | } | |
2669 | ||
2670 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
2671 | const struct nft_set *set, | |
2672 | const struct nft_set_elem *elem) | |
2673 | { | |
2674 | unsigned char *b = skb_tail_pointer(skb); | |
2675 | struct nlattr *nest; | |
2676 | ||
2677 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
2678 | if (nest == NULL) | |
2679 | goto nla_put_failure; | |
2680 | ||
2681 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE, | |
2682 | set->klen) < 0) | |
2683 | goto nla_put_failure; | |
2684 | ||
2685 | if (set->flags & NFT_SET_MAP && | |
2686 | !(elem->flags & NFT_SET_ELEM_INTERVAL_END) && | |
2687 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data, | |
2688 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
2689 | set->dlen) < 0) | |
2690 | goto nla_put_failure; | |
2691 | ||
2692 | if (elem->flags != 0) | |
2693 | if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags))) | |
2694 | goto nla_put_failure; | |
2695 | ||
2696 | nla_nest_end(skb, nest); | |
2697 | return 0; | |
2698 | ||
2699 | nla_put_failure: | |
2700 | nlmsg_trim(skb, b); | |
2701 | return -EMSGSIZE; | |
2702 | } | |
2703 | ||
2704 | struct nft_set_dump_args { | |
2705 | const struct netlink_callback *cb; | |
2706 | struct nft_set_iter iter; | |
2707 | struct sk_buff *skb; | |
2708 | }; | |
2709 | ||
2710 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
2711 | const struct nft_set *set, | |
2712 | const struct nft_set_iter *iter, | |
2713 | const struct nft_set_elem *elem) | |
2714 | { | |
2715 | struct nft_set_dump_args *args; | |
2716 | ||
2717 | args = container_of(iter, struct nft_set_dump_args, iter); | |
2718 | return nf_tables_fill_setelem(args->skb, set, elem); | |
2719 | } | |
2720 | ||
2721 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) | |
2722 | { | |
2723 | const struct nft_set *set; | |
2724 | struct nft_set_dump_args args; | |
2725 | struct nft_ctx ctx; | |
2726 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; | |
2727 | struct nfgenmsg *nfmsg; | |
2728 | struct nlmsghdr *nlh; | |
2729 | struct nlattr *nest; | |
2730 | u32 portid, seq; | |
2731 | int event, err; | |
2732 | ||
720e0dfa MN |
2733 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
2734 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); | |
20a69341 PM |
2735 | if (err < 0) |
2736 | return err; | |
2737 | ||
2738 | err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla); | |
2739 | if (err < 0) | |
2740 | return err; | |
2741 | ||
2742 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2743 | if (IS_ERR(set)) | |
2744 | return PTR_ERR(set); | |
2745 | ||
2746 | event = NFT_MSG_NEWSETELEM; | |
2747 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2748 | portid = NETLINK_CB(cb->skb).portid; | |
2749 | seq = cb->nlh->nlmsg_seq; | |
2750 | ||
2751 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2752 | NLM_F_MULTI); | |
2753 | if (nlh == NULL) | |
2754 | goto nla_put_failure; | |
2755 | ||
2756 | nfmsg = nlmsg_data(nlh); | |
2757 | nfmsg->nfgen_family = NFPROTO_UNSPEC; | |
2758 | nfmsg->version = NFNETLINK_V0; | |
2759 | nfmsg->res_id = 0; | |
2760 | ||
2761 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) | |
2762 | goto nla_put_failure; | |
2763 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
2764 | goto nla_put_failure; | |
2765 | ||
2766 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
2767 | if (nest == NULL) | |
2768 | goto nla_put_failure; | |
2769 | ||
2770 | args.cb = cb; | |
2771 | args.skb = skb; | |
2772 | args.iter.skip = cb->args[0]; | |
2773 | args.iter.count = 0; | |
2774 | args.iter.err = 0; | |
2775 | args.iter.fn = nf_tables_dump_setelem; | |
2776 | set->ops->walk(&ctx, set, &args.iter); | |
2777 | ||
2778 | nla_nest_end(skb, nest); | |
2779 | nlmsg_end(skb, nlh); | |
2780 | ||
2781 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
2782 | return args.iter.err; | |
2783 | if (args.iter.count == cb->args[0]) | |
2784 | return 0; | |
2785 | ||
2786 | cb->args[0] = args.iter.count; | |
2787 | return skb->len; | |
2788 | ||
2789 | nla_put_failure: | |
2790 | return -ENOSPC; | |
2791 | } | |
2792 | ||
2793 | static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2794 | const struct nlmsghdr *nlh, | |
2795 | const struct nlattr * const nla[]) | |
2796 | { | |
2797 | const struct nft_set *set; | |
2798 | struct nft_ctx ctx; | |
2799 | int err; | |
2800 | ||
2801 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
2802 | if (err < 0) | |
2803 | return err; | |
2804 | ||
2805 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2806 | if (IS_ERR(set)) | |
2807 | return PTR_ERR(set); | |
2808 | ||
2809 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2810 | struct netlink_dump_control c = { | |
2811 | .dump = nf_tables_dump_set, | |
2812 | }; | |
2813 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
2814 | } | |
2815 | return -EOPNOTSUPP; | |
2816 | } | |
2817 | ||
d60ce62f AB |
2818 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
2819 | const struct nft_ctx *ctx, u32 seq, | |
2820 | u32 portid, int event, u16 flags, | |
2821 | const struct nft_set *set, | |
2822 | const struct nft_set_elem *elem) | |
2823 | { | |
2824 | struct nfgenmsg *nfmsg; | |
2825 | struct nlmsghdr *nlh; | |
2826 | struct nlattr *nest; | |
2827 | int err; | |
2828 | ||
2829 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2830 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2831 | flags); | |
2832 | if (nlh == NULL) | |
2833 | goto nla_put_failure; | |
2834 | ||
2835 | nfmsg = nlmsg_data(nlh); | |
2836 | nfmsg->nfgen_family = ctx->afi->family; | |
2837 | nfmsg->version = NFNETLINK_V0; | |
2838 | nfmsg->res_id = 0; | |
2839 | ||
2840 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2841 | goto nla_put_failure; | |
2842 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2843 | goto nla_put_failure; | |
2844 | ||
2845 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
2846 | if (nest == NULL) | |
2847 | goto nla_put_failure; | |
2848 | ||
2849 | err = nf_tables_fill_setelem(skb, set, elem); | |
2850 | if (err < 0) | |
2851 | goto nla_put_failure; | |
2852 | ||
2853 | nla_nest_end(skb, nest); | |
2854 | ||
2855 | return nlmsg_end(skb, nlh); | |
2856 | ||
2857 | nla_put_failure: | |
2858 | nlmsg_trim(skb, nlh); | |
2859 | return -1; | |
2860 | } | |
2861 | ||
2862 | static int nf_tables_setelem_notify(const struct nft_ctx *ctx, | |
2863 | const struct nft_set *set, | |
2864 | const struct nft_set_elem *elem, | |
2865 | int event, u16 flags) | |
2866 | { | |
2867 | const struct sk_buff *oskb = ctx->skb; | |
2868 | struct net *net = sock_net(oskb->sk); | |
2869 | u32 portid = NETLINK_CB(oskb).portid; | |
2870 | bool report = nlmsg_report(ctx->nlh); | |
2871 | struct sk_buff *skb; | |
2872 | int err; | |
2873 | ||
2874 | if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) | |
2875 | return 0; | |
2876 | ||
2877 | err = -ENOBUFS; | |
2878 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2879 | if (skb == NULL) | |
2880 | goto err; | |
2881 | ||
2882 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
2883 | set, elem); | |
2884 | if (err < 0) { | |
2885 | kfree_skb(skb); | |
2886 | goto err; | |
2887 | } | |
2888 | ||
2889 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, | |
2890 | GFP_KERNEL); | |
2891 | err: | |
2892 | if (err < 0) | |
2893 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
2894 | return err; | |
2895 | } | |
2896 | ||
20a69341 PM |
2897 | static int nft_add_set_elem(const struct nft_ctx *ctx, struct nft_set *set, |
2898 | const struct nlattr *attr) | |
2899 | { | |
2900 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
2901 | struct nft_data_desc d1, d2; | |
2902 | struct nft_set_elem elem; | |
2903 | struct nft_set_binding *binding; | |
2904 | enum nft_registers dreg; | |
2905 | int err; | |
2906 | ||
c50b960c PM |
2907 | if (set->size && set->nelems == set->size) |
2908 | return -ENFILE; | |
2909 | ||
20a69341 PM |
2910 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, |
2911 | nft_set_elem_policy); | |
2912 | if (err < 0) | |
2913 | return err; | |
2914 | ||
2915 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
2916 | return -EINVAL; | |
2917 | ||
2918 | elem.flags = 0; | |
2919 | if (nla[NFTA_SET_ELEM_FLAGS] != NULL) { | |
2920 | elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS])); | |
2921 | if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END) | |
2922 | return -EINVAL; | |
2923 | } | |
2924 | ||
2925 | if (set->flags & NFT_SET_MAP) { | |
2926 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
2927 | !(elem.flags & NFT_SET_ELEM_INTERVAL_END)) | |
2928 | return -EINVAL; | |
bd7fc645 PNA |
2929 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
2930 | elem.flags & NFT_SET_ELEM_INTERVAL_END) | |
2931 | return -EINVAL; | |
20a69341 PM |
2932 | } else { |
2933 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
2934 | return -EINVAL; | |
2935 | } | |
2936 | ||
2937 | err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]); | |
2938 | if (err < 0) | |
2939 | goto err1; | |
2940 | err = -EINVAL; | |
2941 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
2942 | goto err2; | |
2943 | ||
2944 | err = -EEXIST; | |
2945 | if (set->ops->get(set, &elem) == 0) | |
2946 | goto err2; | |
2947 | ||
2948 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { | |
2949 | err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]); | |
2950 | if (err < 0) | |
2951 | goto err2; | |
2952 | ||
2953 | err = -EINVAL; | |
2954 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
2955 | goto err3; | |
2956 | ||
2957 | dreg = nft_type_to_reg(set->dtype); | |
2958 | list_for_each_entry(binding, &set->bindings, list) { | |
2959 | struct nft_ctx bind_ctx = { | |
2960 | .afi = ctx->afi, | |
2961 | .table = ctx->table, | |
7c95f6d8 | 2962 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
2963 | }; |
2964 | ||
2965 | err = nft_validate_data_load(&bind_ctx, dreg, | |
2966 | &elem.data, d2.type); | |
2967 | if (err < 0) | |
2968 | goto err3; | |
2969 | } | |
2970 | } | |
2971 | ||
2972 | err = set->ops->insert(set, &elem); | |
2973 | if (err < 0) | |
2974 | goto err3; | |
c50b960c | 2975 | set->nelems++; |
20a69341 | 2976 | |
d60ce62f | 2977 | nf_tables_setelem_notify(ctx, set, &elem, NFT_MSG_NEWSETELEM, 0); |
20a69341 PM |
2978 | return 0; |
2979 | ||
2980 | err3: | |
2981 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
2982 | nft_data_uninit(&elem.data, d2.type); | |
2983 | err2: | |
2984 | nft_data_uninit(&elem.key, d1.type); | |
2985 | err1: | |
2986 | return err; | |
2987 | } | |
2988 | ||
2989 | static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2990 | const struct nlmsghdr *nlh, | |
2991 | const struct nlattr * const nla[]) | |
2992 | { | |
2993 | const struct nlattr *attr; | |
2994 | struct nft_set *set; | |
2995 | struct nft_ctx ctx; | |
2996 | int rem, err; | |
2997 | ||
2998 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
2999 | if (err < 0) | |
3000 | return err; | |
3001 | ||
3002 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
3003 | if (IS_ERR(set)) | |
3004 | return PTR_ERR(set); | |
3005 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
3006 | return -EBUSY; | |
3007 | ||
3008 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3009 | err = nft_add_set_elem(&ctx, set, attr); | |
3010 | if (err < 0) | |
3011 | return err; | |
3012 | } | |
3013 | return 0; | |
3014 | } | |
3015 | ||
3016 | static int nft_del_setelem(const struct nft_ctx *ctx, struct nft_set *set, | |
3017 | const struct nlattr *attr) | |
3018 | { | |
3019 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3020 | struct nft_data_desc desc; | |
3021 | struct nft_set_elem elem; | |
3022 | int err; | |
3023 | ||
3024 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3025 | nft_set_elem_policy); | |
3026 | if (err < 0) | |
3027 | goto err1; | |
3028 | ||
3029 | err = -EINVAL; | |
3030 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3031 | goto err1; | |
3032 | ||
3033 | err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]); | |
3034 | if (err < 0) | |
3035 | goto err1; | |
3036 | ||
3037 | err = -EINVAL; | |
3038 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
3039 | goto err2; | |
3040 | ||
3041 | err = set->ops->get(set, &elem); | |
3042 | if (err < 0) | |
3043 | goto err2; | |
3044 | ||
3045 | set->ops->remove(set, &elem); | |
c50b960c | 3046 | set->nelems--; |
20a69341 | 3047 | |
d60ce62f AB |
3048 | nf_tables_setelem_notify(ctx, set, &elem, NFT_MSG_DELSETELEM, 0); |
3049 | ||
20a69341 PM |
3050 | nft_data_uninit(&elem.key, NFT_DATA_VALUE); |
3051 | if (set->flags & NFT_SET_MAP) | |
3052 | nft_data_uninit(&elem.data, set->dtype); | |
3053 | ||
3054 | err2: | |
3055 | nft_data_uninit(&elem.key, desc.type); | |
3056 | err1: | |
3057 | return err; | |
3058 | } | |
3059 | ||
3060 | static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb, | |
3061 | const struct nlmsghdr *nlh, | |
3062 | const struct nlattr * const nla[]) | |
3063 | { | |
3064 | const struct nlattr *attr; | |
3065 | struct nft_set *set; | |
3066 | struct nft_ctx ctx; | |
3067 | int rem, err; | |
3068 | ||
3069 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); | |
3070 | if (err < 0) | |
3071 | return err; | |
3072 | ||
3073 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
3074 | if (IS_ERR(set)) | |
3075 | return PTR_ERR(set); | |
3076 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
3077 | return -EBUSY; | |
3078 | ||
3079 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3080 | err = nft_del_setelem(&ctx, set, attr); | |
3081 | if (err < 0) | |
3082 | return err; | |
3083 | } | |
3084 | return 0; | |
3085 | } | |
3086 | ||
96518518 PM |
3087 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
3088 | [NFT_MSG_NEWTABLE] = { | |
3089 | .call = nf_tables_newtable, | |
3090 | .attr_count = NFTA_TABLE_MAX, | |
3091 | .policy = nft_table_policy, | |
3092 | }, | |
3093 | [NFT_MSG_GETTABLE] = { | |
3094 | .call = nf_tables_gettable, | |
3095 | .attr_count = NFTA_TABLE_MAX, | |
3096 | .policy = nft_table_policy, | |
3097 | }, | |
3098 | [NFT_MSG_DELTABLE] = { | |
3099 | .call = nf_tables_deltable, | |
3100 | .attr_count = NFTA_TABLE_MAX, | |
3101 | .policy = nft_table_policy, | |
3102 | }, | |
3103 | [NFT_MSG_NEWCHAIN] = { | |
3104 | .call = nf_tables_newchain, | |
3105 | .attr_count = NFTA_CHAIN_MAX, | |
3106 | .policy = nft_chain_policy, | |
3107 | }, | |
3108 | [NFT_MSG_GETCHAIN] = { | |
3109 | .call = nf_tables_getchain, | |
3110 | .attr_count = NFTA_CHAIN_MAX, | |
3111 | .policy = nft_chain_policy, | |
3112 | }, | |
3113 | [NFT_MSG_DELCHAIN] = { | |
3114 | .call = nf_tables_delchain, | |
3115 | .attr_count = NFTA_CHAIN_MAX, | |
3116 | .policy = nft_chain_policy, | |
3117 | }, | |
3118 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 3119 | .call_batch = nf_tables_newrule, |
96518518 PM |
3120 | .attr_count = NFTA_RULE_MAX, |
3121 | .policy = nft_rule_policy, | |
3122 | }, | |
3123 | [NFT_MSG_GETRULE] = { | |
3124 | .call = nf_tables_getrule, | |
3125 | .attr_count = NFTA_RULE_MAX, | |
3126 | .policy = nft_rule_policy, | |
3127 | }, | |
3128 | [NFT_MSG_DELRULE] = { | |
0628b123 | 3129 | .call_batch = nf_tables_delrule, |
96518518 PM |
3130 | .attr_count = NFTA_RULE_MAX, |
3131 | .policy = nft_rule_policy, | |
3132 | }, | |
20a69341 PM |
3133 | [NFT_MSG_NEWSET] = { |
3134 | .call = nf_tables_newset, | |
3135 | .attr_count = NFTA_SET_MAX, | |
3136 | .policy = nft_set_policy, | |
3137 | }, | |
3138 | [NFT_MSG_GETSET] = { | |
3139 | .call = nf_tables_getset, | |
3140 | .attr_count = NFTA_SET_MAX, | |
3141 | .policy = nft_set_policy, | |
3142 | }, | |
3143 | [NFT_MSG_DELSET] = { | |
3144 | .call = nf_tables_delset, | |
3145 | .attr_count = NFTA_SET_MAX, | |
3146 | .policy = nft_set_policy, | |
3147 | }, | |
3148 | [NFT_MSG_NEWSETELEM] = { | |
3149 | .call = nf_tables_newsetelem, | |
3150 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
3151 | .policy = nft_set_elem_list_policy, | |
3152 | }, | |
3153 | [NFT_MSG_GETSETELEM] = { | |
3154 | .call = nf_tables_getsetelem, | |
3155 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
3156 | .policy = nft_set_elem_list_policy, | |
3157 | }, | |
3158 | [NFT_MSG_DELSETELEM] = { | |
3159 | .call = nf_tables_delsetelem, | |
3160 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
3161 | .policy = nft_set_elem_list_policy, | |
3162 | }, | |
96518518 PM |
3163 | }; |
3164 | ||
3165 | static const struct nfnetlink_subsystem nf_tables_subsys = { | |
3166 | .name = "nf_tables", | |
3167 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
3168 | .cb_count = NFT_MSG_MAX, | |
3169 | .cb = nf_tables_cb, | |
0628b123 PNA |
3170 | .commit = nf_tables_commit, |
3171 | .abort = nf_tables_abort, | |
96518518 PM |
3172 | }; |
3173 | ||
20a69341 PM |
3174 | /* |
3175 | * Loop detection - walk through the ruleset beginning at the destination chain | |
3176 | * of a new jump until either the source chain is reached (loop) or all | |
3177 | * reachable chains have been traversed. | |
3178 | * | |
3179 | * The loop check is performed whenever a new jump verdict is added to an | |
3180 | * expression or verdict map or a verdict map is bound to a new chain. | |
3181 | */ | |
3182 | ||
3183 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
3184 | const struct nft_chain *chain); | |
3185 | ||
3186 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
3187 | const struct nft_set *set, | |
3188 | const struct nft_set_iter *iter, | |
3189 | const struct nft_set_elem *elem) | |
3190 | { | |
62f9c8b4 PNA |
3191 | if (elem->flags & NFT_SET_ELEM_INTERVAL_END) |
3192 | return 0; | |
3193 | ||
20a69341 PM |
3194 | switch (elem->data.verdict) { |
3195 | case NFT_JUMP: | |
3196 | case NFT_GOTO: | |
3197 | return nf_tables_check_loops(ctx, elem->data.chain); | |
3198 | default: | |
3199 | return 0; | |
3200 | } | |
3201 | } | |
3202 | ||
3203 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
3204 | const struct nft_chain *chain) | |
3205 | { | |
3206 | const struct nft_rule *rule; | |
3207 | const struct nft_expr *expr, *last; | |
20a69341 PM |
3208 | const struct nft_set *set; |
3209 | struct nft_set_binding *binding; | |
3210 | struct nft_set_iter iter; | |
20a69341 PM |
3211 | |
3212 | if (ctx->chain == chain) | |
3213 | return -ELOOP; | |
3214 | ||
3215 | list_for_each_entry(rule, &chain->rules, list) { | |
3216 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
3217 | const struct nft_data *data = NULL; |
3218 | int err; | |
3219 | ||
3220 | if (!expr->ops->validate) | |
20a69341 PM |
3221 | continue; |
3222 | ||
0ca743a5 PNA |
3223 | err = expr->ops->validate(ctx, expr, &data); |
3224 | if (err < 0) | |
3225 | return err; | |
3226 | ||
20a69341 | 3227 | if (data == NULL) |
0ca743a5 | 3228 | continue; |
20a69341 PM |
3229 | |
3230 | switch (data->verdict) { | |
3231 | case NFT_JUMP: | |
3232 | case NFT_GOTO: | |
3233 | err = nf_tables_check_loops(ctx, data->chain); | |
3234 | if (err < 0) | |
3235 | return err; | |
3236 | default: | |
3237 | break; | |
3238 | } | |
3239 | } | |
3240 | } | |
3241 | ||
3242 | list_for_each_entry(set, &ctx->table->sets, list) { | |
3243 | if (!(set->flags & NFT_SET_MAP) || | |
3244 | set->dtype != NFT_DATA_VERDICT) | |
3245 | continue; | |
3246 | ||
3247 | list_for_each_entry(binding, &set->bindings, list) { | |
3248 | if (binding->chain != chain) | |
3249 | continue; | |
3250 | ||
3251 | iter.skip = 0; | |
3252 | iter.count = 0; | |
3253 | iter.err = 0; | |
3254 | iter.fn = nf_tables_loop_check_setelem; | |
3255 | ||
3256 | set->ops->walk(ctx, set, &iter); | |
3257 | if (iter.err < 0) | |
3258 | return iter.err; | |
3259 | } | |
3260 | } | |
3261 | ||
3262 | return 0; | |
3263 | } | |
3264 | ||
96518518 PM |
3265 | /** |
3266 | * nft_validate_input_register - validate an expressions' input register | |
3267 | * | |
3268 | * @reg: the register number | |
3269 | * | |
3270 | * Validate that the input register is one of the general purpose | |
3271 | * registers. | |
3272 | */ | |
3273 | int nft_validate_input_register(enum nft_registers reg) | |
3274 | { | |
3275 | if (reg <= NFT_REG_VERDICT) | |
3276 | return -EINVAL; | |
3277 | if (reg > NFT_REG_MAX) | |
3278 | return -ERANGE; | |
3279 | return 0; | |
3280 | } | |
3281 | EXPORT_SYMBOL_GPL(nft_validate_input_register); | |
3282 | ||
3283 | /** | |
3284 | * nft_validate_output_register - validate an expressions' output register | |
3285 | * | |
3286 | * @reg: the register number | |
3287 | * | |
3288 | * Validate that the output register is one of the general purpose | |
3289 | * registers or the verdict register. | |
3290 | */ | |
3291 | int nft_validate_output_register(enum nft_registers reg) | |
3292 | { | |
3293 | if (reg < NFT_REG_VERDICT) | |
3294 | return -EINVAL; | |
3295 | if (reg > NFT_REG_MAX) | |
3296 | return -ERANGE; | |
3297 | return 0; | |
3298 | } | |
3299 | EXPORT_SYMBOL_GPL(nft_validate_output_register); | |
3300 | ||
3301 | /** | |
3302 | * nft_validate_data_load - validate an expressions' data load | |
3303 | * | |
3304 | * @ctx: context of the expression performing the load | |
3305 | * @reg: the destination register number | |
3306 | * @data: the data to load | |
3307 | * @type: the data type | |
3308 | * | |
3309 | * Validate that a data load uses the appropriate data type for | |
3310 | * the destination register. A value of NULL for the data means | |
3311 | * that its runtime gathered data, which is always of type | |
3312 | * NFT_DATA_VALUE. | |
3313 | */ | |
3314 | int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg, | |
3315 | const struct nft_data *data, | |
3316 | enum nft_data_types type) | |
3317 | { | |
20a69341 PM |
3318 | int err; |
3319 | ||
96518518 PM |
3320 | switch (reg) { |
3321 | case NFT_REG_VERDICT: | |
3322 | if (data == NULL || type != NFT_DATA_VERDICT) | |
3323 | return -EINVAL; | |
20a69341 PM |
3324 | |
3325 | if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) { | |
3326 | err = nf_tables_check_loops(ctx, data->chain); | |
3327 | if (err < 0) | |
3328 | return err; | |
3329 | ||
3330 | if (ctx->chain->level + 1 > data->chain->level) { | |
3331 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) | |
3332 | return -EMLINK; | |
3333 | data->chain->level = ctx->chain->level + 1; | |
3334 | } | |
3335 | } | |
3336 | ||
96518518 PM |
3337 | return 0; |
3338 | default: | |
3339 | if (data != NULL && type != NFT_DATA_VALUE) | |
3340 | return -EINVAL; | |
3341 | return 0; | |
3342 | } | |
3343 | } | |
3344 | EXPORT_SYMBOL_GPL(nft_validate_data_load); | |
3345 | ||
3346 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
3347 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
3348 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
3349 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
3350 | }; | |
3351 | ||
3352 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3353 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3354 | { | |
3355 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; | |
3356 | struct nft_chain *chain; | |
3357 | int err; | |
3358 | ||
3359 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); | |
3360 | if (err < 0) | |
3361 | return err; | |
3362 | ||
3363 | if (!tb[NFTA_VERDICT_CODE]) | |
3364 | return -EINVAL; | |
3365 | data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); | |
3366 | ||
3367 | switch (data->verdict) { | |
e0abdadc PM |
3368 | default: |
3369 | switch (data->verdict & NF_VERDICT_MASK) { | |
3370 | case NF_ACCEPT: | |
3371 | case NF_DROP: | |
3372 | case NF_QUEUE: | |
3373 | break; | |
3374 | default: | |
3375 | return -EINVAL; | |
3376 | } | |
3377 | /* fall through */ | |
96518518 PM |
3378 | case NFT_CONTINUE: |
3379 | case NFT_BREAK: | |
3380 | case NFT_RETURN: | |
3381 | desc->len = sizeof(data->verdict); | |
3382 | break; | |
3383 | case NFT_JUMP: | |
3384 | case NFT_GOTO: | |
3385 | if (!tb[NFTA_VERDICT_CHAIN]) | |
3386 | return -EINVAL; | |
3387 | chain = nf_tables_chain_lookup(ctx->table, | |
3388 | tb[NFTA_VERDICT_CHAIN]); | |
3389 | if (IS_ERR(chain)) | |
3390 | return PTR_ERR(chain); | |
3391 | if (chain->flags & NFT_BASE_CHAIN) | |
3392 | return -EOPNOTSUPP; | |
3393 | ||
96518518 PM |
3394 | chain->use++; |
3395 | data->chain = chain; | |
3396 | desc->len = sizeof(data); | |
3397 | break; | |
96518518 PM |
3398 | } |
3399 | ||
3400 | desc->type = NFT_DATA_VERDICT; | |
3401 | return 0; | |
3402 | } | |
3403 | ||
3404 | static void nft_verdict_uninit(const struct nft_data *data) | |
3405 | { | |
3406 | switch (data->verdict) { | |
3407 | case NFT_JUMP: | |
3408 | case NFT_GOTO: | |
3409 | data->chain->use--; | |
3410 | break; | |
3411 | } | |
3412 | } | |
3413 | ||
3414 | static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) | |
3415 | { | |
3416 | struct nlattr *nest; | |
3417 | ||
3418 | nest = nla_nest_start(skb, NFTA_DATA_VERDICT); | |
3419 | if (!nest) | |
3420 | goto nla_put_failure; | |
3421 | ||
3422 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict))) | |
3423 | goto nla_put_failure; | |
3424 | ||
3425 | switch (data->verdict) { | |
3426 | case NFT_JUMP: | |
3427 | case NFT_GOTO: | |
3428 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name)) | |
3429 | goto nla_put_failure; | |
3430 | } | |
3431 | nla_nest_end(skb, nest); | |
3432 | return 0; | |
3433 | ||
3434 | nla_put_failure: | |
3435 | return -1; | |
3436 | } | |
3437 | ||
3438 | static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3439 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3440 | { | |
3441 | unsigned int len; | |
3442 | ||
3443 | len = nla_len(nla); | |
3444 | if (len == 0) | |
3445 | return -EINVAL; | |
3446 | if (len > sizeof(data->data)) | |
3447 | return -EOVERFLOW; | |
3448 | ||
3449 | nla_memcpy(data->data, nla, sizeof(data->data)); | |
3450 | desc->type = NFT_DATA_VALUE; | |
3451 | desc->len = len; | |
3452 | return 0; | |
3453 | } | |
3454 | ||
3455 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
3456 | unsigned int len) | |
3457 | { | |
3458 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
3459 | } | |
3460 | ||
3461 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
3462 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY, | |
3463 | .len = FIELD_SIZEOF(struct nft_data, data) }, | |
3464 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, | |
3465 | }; | |
3466 | ||
3467 | /** | |
3468 | * nft_data_init - parse nf_tables data netlink attributes | |
3469 | * | |
3470 | * @ctx: context of the expression using the data | |
3471 | * @data: destination struct nft_data | |
3472 | * @desc: data description | |
3473 | * @nla: netlink attribute containing data | |
3474 | * | |
3475 | * Parse the netlink data attributes and initialize a struct nft_data. | |
3476 | * The type and length of data are returned in the data description. | |
3477 | * | |
3478 | * The caller can indicate that it only wants to accept data of type | |
3479 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
3480 | */ | |
3481 | int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3482 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3483 | { | |
3484 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
3485 | int err; | |
3486 | ||
3487 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); | |
3488 | if (err < 0) | |
3489 | return err; | |
3490 | ||
3491 | if (tb[NFTA_DATA_VALUE]) | |
3492 | return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); | |
3493 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) | |
3494 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
3495 | return -EINVAL; | |
3496 | } | |
3497 | EXPORT_SYMBOL_GPL(nft_data_init); | |
3498 | ||
3499 | /** | |
3500 | * nft_data_uninit - release a nft_data item | |
3501 | * | |
3502 | * @data: struct nft_data to release | |
3503 | * @type: type of data | |
3504 | * | |
3505 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
3506 | * all others need to be released by calling this function. | |
3507 | */ | |
3508 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) | |
3509 | { | |
3510 | switch (type) { | |
3511 | case NFT_DATA_VALUE: | |
3512 | return; | |
3513 | case NFT_DATA_VERDICT: | |
3514 | return nft_verdict_uninit(data); | |
3515 | default: | |
3516 | WARN_ON(1); | |
3517 | } | |
3518 | } | |
3519 | EXPORT_SYMBOL_GPL(nft_data_uninit); | |
3520 | ||
3521 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
3522 | enum nft_data_types type, unsigned int len) | |
3523 | { | |
3524 | struct nlattr *nest; | |
3525 | int err; | |
3526 | ||
3527 | nest = nla_nest_start(skb, attr); | |
3528 | if (nest == NULL) | |
3529 | return -1; | |
3530 | ||
3531 | switch (type) { | |
3532 | case NFT_DATA_VALUE: | |
3533 | err = nft_value_dump(skb, data, len); | |
3534 | break; | |
3535 | case NFT_DATA_VERDICT: | |
3536 | err = nft_verdict_dump(skb, data); | |
3537 | break; | |
3538 | default: | |
3539 | err = -EINVAL; | |
3540 | WARN_ON(1); | |
3541 | } | |
3542 | ||
3543 | nla_nest_end(skb, nest); | |
3544 | return err; | |
3545 | } | |
3546 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
3547 | ||
99633ab2 PNA |
3548 | static int nf_tables_init_net(struct net *net) |
3549 | { | |
3550 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 3551 | INIT_LIST_HEAD(&net->nft.commit_list); |
99633ab2 PNA |
3552 | return 0; |
3553 | } | |
3554 | ||
3555 | static struct pernet_operations nf_tables_net_ops = { | |
3556 | .init = nf_tables_init_net, | |
3557 | }; | |
3558 | ||
96518518 PM |
3559 | static int __init nf_tables_module_init(void) |
3560 | { | |
3561 | int err; | |
3562 | ||
3563 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
3564 | GFP_KERNEL); | |
3565 | if (info == NULL) { | |
3566 | err = -ENOMEM; | |
3567 | goto err1; | |
3568 | } | |
3569 | ||
3570 | err = nf_tables_core_module_init(); | |
3571 | if (err < 0) | |
3572 | goto err2; | |
3573 | ||
3574 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
3575 | if (err < 0) | |
3576 | goto err3; | |
3577 | ||
3578 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 3579 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
3580 | err3: |
3581 | nf_tables_core_module_exit(); | |
3582 | err2: | |
3583 | kfree(info); | |
3584 | err1: | |
3585 | return err; | |
3586 | } | |
3587 | ||
3588 | static void __exit nf_tables_module_exit(void) | |
3589 | { | |
99633ab2 | 3590 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
3591 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
3592 | nf_tables_core_module_exit(); | |
3593 | kfree(info); | |
3594 | } | |
3595 | ||
3596 | module_init(nf_tables_module_init); | |
3597 | module_exit(nf_tables_module_exit); | |
3598 | ||
3599 | MODULE_LICENSE("GPL"); | |
3600 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
3601 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |