Commit | Line | Data |
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f9e815b3 HW |
1 | /* Netfilter messages via netlink socket. Allows for user space |
2 | * protocol helpers and general trouble making from userspace. | |
3 | * | |
4 | * (C) 2001 by Jay Schulist <jschlst@samba.org>, | |
5 | * (C) 2002-2005 by Harald Welte <laforge@gnumonks.org> | |
67ca3966 | 6 | * (C) 2005,2007 by Pablo Neira Ayuso <pablo@netfilter.org> |
f9e815b3 HW |
7 | * |
8 | * Initial netfilter messages via netlink development funded and | |
9 | * generally made possible by Network Robots, Inc. (www.networkrobots.com) | |
10 | * | |
11 | * Further development of this code funded by Astaro AG (http://www.astaro.com) | |
12 | * | |
13 | * This software may be used and distributed according to the terms | |
14 | * of the GNU General Public License, incorporated herein by reference. | |
15 | */ | |
16 | ||
f9e815b3 HW |
17 | #include <linux/module.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/socket.h> | |
20 | #include <linux/kernel.h> | |
f9e815b3 HW |
21 | #include <linux/string.h> |
22 | #include <linux/sockios.h> | |
23 | #include <linux/net.h> | |
f9e815b3 HW |
24 | #include <linux/skbuff.h> |
25 | #include <asm/uaccess.h> | |
f9e815b3 HW |
26 | #include <net/sock.h> |
27 | #include <linux/init.h> | |
f9e815b3 | 28 | |
573ce260 | 29 | #include <net/netlink.h> |
f9e815b3 HW |
30 | #include <linux/netfilter/nfnetlink.h> |
31 | ||
32 | MODULE_LICENSE("GPL"); | |
4fdb3bb7 HW |
33 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
34 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NETFILTER); | |
f9e815b3 HW |
35 | |
36 | static char __initdata nfversion[] = "0.30"; | |
37 | ||
c14b78e7 PNA |
38 | static struct { |
39 | struct mutex mutex; | |
40 | const struct nfnetlink_subsystem __rcu *subsys; | |
41 | } table[NFNL_SUBSYS_COUNT]; | |
f9e815b3 | 42 | |
03292745 PNA |
43 | static const int nfnl_group2type[NFNLGRP_MAX+1] = { |
44 | [NFNLGRP_CONNTRACK_NEW] = NFNL_SUBSYS_CTNETLINK, | |
45 | [NFNLGRP_CONNTRACK_UPDATE] = NFNL_SUBSYS_CTNETLINK, | |
46 | [NFNLGRP_CONNTRACK_DESTROY] = NFNL_SUBSYS_CTNETLINK, | |
47 | [NFNLGRP_CONNTRACK_EXP_NEW] = NFNL_SUBSYS_CTNETLINK_EXP, | |
48 | [NFNLGRP_CONNTRACK_EXP_UPDATE] = NFNL_SUBSYS_CTNETLINK_EXP, | |
49 | [NFNLGRP_CONNTRACK_EXP_DESTROY] = NFNL_SUBSYS_CTNETLINK_EXP, | |
50 | }; | |
51 | ||
c14b78e7 | 52 | void nfnl_lock(__u8 subsys_id) |
f9e815b3 | 53 | { |
c14b78e7 | 54 | mutex_lock(&table[subsys_id].mutex); |
f9e815b3 | 55 | } |
e6a7d3c0 | 56 | EXPORT_SYMBOL_GPL(nfnl_lock); |
f9e815b3 | 57 | |
c14b78e7 | 58 | void nfnl_unlock(__u8 subsys_id) |
a3c5029c | 59 | { |
c14b78e7 | 60 | mutex_unlock(&table[subsys_id].mutex); |
f9e815b3 | 61 | } |
e6a7d3c0 | 62 | EXPORT_SYMBOL_GPL(nfnl_unlock); |
f9e815b3 | 63 | |
0eb5db7a PM |
64 | #ifdef CONFIG_PROVE_LOCKING |
65 | int lockdep_nfnl_is_held(u8 subsys_id) | |
66 | { | |
67 | return lockdep_is_held(&table[subsys_id].mutex); | |
68 | } | |
69 | EXPORT_SYMBOL_GPL(lockdep_nfnl_is_held); | |
70 | #endif | |
71 | ||
7c8d4cb4 | 72 | int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n) |
f9e815b3 | 73 | { |
c14b78e7 PNA |
74 | nfnl_lock(n->subsys_id); |
75 | if (table[n->subsys_id].subsys) { | |
76 | nfnl_unlock(n->subsys_id); | |
0ab43f84 HW |
77 | return -EBUSY; |
78 | } | |
c14b78e7 PNA |
79 | rcu_assign_pointer(table[n->subsys_id].subsys, n); |
80 | nfnl_unlock(n->subsys_id); | |
f9e815b3 HW |
81 | |
82 | return 0; | |
83 | } | |
f4bc177f | 84 | EXPORT_SYMBOL_GPL(nfnetlink_subsys_register); |
f9e815b3 | 85 | |
7c8d4cb4 | 86 | int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n) |
f9e815b3 | 87 | { |
c14b78e7 PNA |
88 | nfnl_lock(n->subsys_id); |
89 | table[n->subsys_id].subsys = NULL; | |
90 | nfnl_unlock(n->subsys_id); | |
6b75e3e8 | 91 | synchronize_rcu(); |
f9e815b3 HW |
92 | return 0; |
93 | } | |
f4bc177f | 94 | EXPORT_SYMBOL_GPL(nfnetlink_subsys_unregister); |
f9e815b3 | 95 | |
7c8d4cb4 | 96 | static inline const struct nfnetlink_subsystem *nfnetlink_get_subsys(u_int16_t type) |
f9e815b3 HW |
97 | { |
98 | u_int8_t subsys_id = NFNL_SUBSYS_ID(type); | |
99 | ||
ac0f1d98 | 100 | if (subsys_id >= NFNL_SUBSYS_COUNT) |
f9e815b3 HW |
101 | return NULL; |
102 | ||
c14b78e7 | 103 | return rcu_dereference(table[subsys_id].subsys); |
f9e815b3 HW |
104 | } |
105 | ||
7c8d4cb4 PM |
106 | static inline const struct nfnl_callback * |
107 | nfnetlink_find_client(u_int16_t type, const struct nfnetlink_subsystem *ss) | |
f9e815b3 HW |
108 | { |
109 | u_int8_t cb_id = NFNL_MSG_TYPE(type); | |
601e68e1 | 110 | |
67ca3966 | 111 | if (cb_id >= ss->cb_count) |
f9e815b3 | 112 | return NULL; |
f9e815b3 HW |
113 | |
114 | return &ss->cb[cb_id]; | |
115 | } | |
116 | ||
cd8c20b6 | 117 | int nfnetlink_has_listeners(struct net *net, unsigned int group) |
a2427692 | 118 | { |
cd8c20b6 | 119 | return netlink_has_listeners(net->nfnl, group); |
a2427692 PM |
120 | } |
121 | EXPORT_SYMBOL_GPL(nfnetlink_has_listeners); | |
122 | ||
3ab1f683 PM |
123 | struct sk_buff *nfnetlink_alloc_skb(struct net *net, unsigned int size, |
124 | u32 dst_portid, gfp_t gfp_mask) | |
125 | { | |
126 | return netlink_alloc_skb(net->nfnl, size, dst_portid, gfp_mask); | |
127 | } | |
128 | EXPORT_SYMBOL_GPL(nfnetlink_alloc_skb); | |
129 | ||
ec464e5d | 130 | int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid, |
95c96174 | 131 | unsigned int group, int echo, gfp_t flags) |
f9e815b3 | 132 | { |
ec464e5d | 133 | return nlmsg_notify(net->nfnl, skb, portid, group, echo, flags); |
f9e815b3 | 134 | } |
f4bc177f | 135 | EXPORT_SYMBOL_GPL(nfnetlink_send); |
f9e815b3 | 136 | |
ec464e5d | 137 | int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error) |
dd5b6ce6 | 138 | { |
ec464e5d | 139 | return netlink_set_err(net->nfnl, portid, group, error); |
dd5b6ce6 PNA |
140 | } |
141 | EXPORT_SYMBOL_GPL(nfnetlink_set_err); | |
142 | ||
ec464e5d PM |
143 | int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid, |
144 | int flags) | |
f9e815b3 | 145 | { |
ec464e5d | 146 | return netlink_unicast(net->nfnl, skb, portid, flags); |
f9e815b3 | 147 | } |
f4bc177f | 148 | EXPORT_SYMBOL_GPL(nfnetlink_unicast); |
f9e815b3 HW |
149 | |
150 | /* Process one complete nfnetlink message. */ | |
1d00a4eb | 151 | static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
f9e815b3 | 152 | { |
cd8c20b6 | 153 | struct net *net = sock_net(skb->sk); |
7c8d4cb4 PM |
154 | const struct nfnl_callback *nc; |
155 | const struct nfnetlink_subsystem *ss; | |
1d00a4eb | 156 | int type, err; |
f9e815b3 | 157 | |
f9e815b3 | 158 | /* All the messages must at least contain nfgenmsg */ |
573ce260 | 159 | if (nlmsg_len(nlh) < sizeof(struct nfgenmsg)) |
f9e815b3 | 160 | return 0; |
f9e815b3 HW |
161 | |
162 | type = nlh->nlmsg_type; | |
e6a7d3c0 | 163 | replay: |
6b75e3e8 | 164 | rcu_read_lock(); |
f9e815b3 | 165 | ss = nfnetlink_get_subsys(type); |
0ab43f84 | 166 | if (!ss) { |
95a5afca | 167 | #ifdef CONFIG_MODULES |
6b75e3e8 | 168 | rcu_read_unlock(); |
37d2e7a2 | 169 | request_module("nfnetlink-subsys-%d", NFNL_SUBSYS_ID(type)); |
6b75e3e8 | 170 | rcu_read_lock(); |
37d2e7a2 | 171 | ss = nfnetlink_get_subsys(type); |
0ab43f84 HW |
172 | if (!ss) |
173 | #endif | |
6b75e3e8 ED |
174 | { |
175 | rcu_read_unlock(); | |
1d00a4eb | 176 | return -EINVAL; |
6b75e3e8 | 177 | } |
0ab43f84 | 178 | } |
f9e815b3 HW |
179 | |
180 | nc = nfnetlink_find_client(type, ss); | |
6b75e3e8 ED |
181 | if (!nc) { |
182 | rcu_read_unlock(); | |
1d00a4eb | 183 | return -EINVAL; |
6b75e3e8 | 184 | } |
f9e815b3 | 185 | |
f9e815b3 | 186 | { |
573ce260 | 187 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
e3730578 | 188 | u_int8_t cb_id = NFNL_MSG_TYPE(nlh->nlmsg_type); |
f49c857f PNA |
189 | struct nlattr *cda[ss->cb[cb_id].attr_count + 1]; |
190 | struct nlattr *attr = (void *)nlh + min_len; | |
191 | int attrlen = nlh->nlmsg_len - min_len; | |
c14b78e7 | 192 | __u8 subsys_id = NFNL_SUBSYS_ID(type); |
f49c857f PNA |
193 | |
194 | err = nla_parse(cda, ss->cb[cb_id].attr_count, | |
195 | attr, attrlen, ss->cb[cb_id].policy); | |
4009e188 TB |
196 | if (err < 0) { |
197 | rcu_read_unlock(); | |
f49c857f | 198 | return err; |
4009e188 | 199 | } |
601e68e1 | 200 | |
6b75e3e8 ED |
201 | if (nc->call_rcu) { |
202 | err = nc->call_rcu(net->nfnl, skb, nlh, | |
203 | (const struct nlattr **)cda); | |
204 | rcu_read_unlock(); | |
205 | } else { | |
206 | rcu_read_unlock(); | |
c14b78e7 PNA |
207 | nfnl_lock(subsys_id); |
208 | if (rcu_dereference_protected(table[subsys_id].subsys, | |
9df9e783 | 209 | lockdep_is_held(&table[subsys_id].mutex)) != ss || |
6b75e3e8 ED |
210 | nfnetlink_find_client(type, ss) != nc) |
211 | err = -EAGAIN; | |
59560a38 | 212 | else if (nc->call) |
6b75e3e8 ED |
213 | err = nc->call(net->nfnl, skb, nlh, |
214 | (const struct nlattr **)cda); | |
59560a38 TB |
215 | else |
216 | err = -EINVAL; | |
c14b78e7 | 217 | nfnl_unlock(subsys_id); |
6b75e3e8 | 218 | } |
e6a7d3c0 PNA |
219 | if (err == -EAGAIN) |
220 | goto replay; | |
221 | return err; | |
f9e815b3 | 222 | } |
f9e815b3 HW |
223 | } |
224 | ||
cbb8125e PNA |
225 | struct nfnl_err { |
226 | struct list_head head; | |
227 | struct nlmsghdr *nlh; | |
228 | int err; | |
229 | }; | |
230 | ||
231 | static int nfnl_err_add(struct list_head *list, struct nlmsghdr *nlh, int err) | |
232 | { | |
233 | struct nfnl_err *nfnl_err; | |
234 | ||
235 | nfnl_err = kmalloc(sizeof(struct nfnl_err), GFP_KERNEL); | |
236 | if (nfnl_err == NULL) | |
237 | return -ENOMEM; | |
238 | ||
239 | nfnl_err->nlh = nlh; | |
240 | nfnl_err->err = err; | |
241 | list_add_tail(&nfnl_err->head, list); | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | static void nfnl_err_del(struct nfnl_err *nfnl_err) | |
247 | { | |
248 | list_del(&nfnl_err->head); | |
249 | kfree(nfnl_err); | |
250 | } | |
251 | ||
252 | static void nfnl_err_reset(struct list_head *err_list) | |
253 | { | |
254 | struct nfnl_err *nfnl_err, *next; | |
255 | ||
256 | list_for_each_entry_safe(nfnl_err, next, err_list, head) | |
257 | nfnl_err_del(nfnl_err); | |
258 | } | |
259 | ||
260 | static void nfnl_err_deliver(struct list_head *err_list, struct sk_buff *skb) | |
261 | { | |
262 | struct nfnl_err *nfnl_err, *next; | |
263 | ||
264 | list_for_each_entry_safe(nfnl_err, next, err_list, head) { | |
265 | netlink_ack(skb, nfnl_err->nlh, nfnl_err->err); | |
266 | nfnl_err_del(nfnl_err); | |
267 | } | |
268 | } | |
269 | ||
0628b123 PNA |
270 | static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh, |
271 | u_int16_t subsys_id) | |
272 | { | |
273 | struct sk_buff *nskb, *oskb = skb; | |
274 | struct net *net = sock_net(skb->sk); | |
275 | const struct nfnetlink_subsystem *ss; | |
276 | const struct nfnl_callback *nc; | |
277 | bool success = true, done = false; | |
cbb8125e | 278 | static LIST_HEAD(err_list); |
0628b123 PNA |
279 | int err; |
280 | ||
281 | if (subsys_id >= NFNL_SUBSYS_COUNT) | |
282 | return netlink_ack(skb, nlh, -EINVAL); | |
283 | replay: | |
284 | nskb = netlink_skb_clone(oskb, GFP_KERNEL); | |
285 | if (!nskb) | |
286 | return netlink_ack(oskb, nlh, -ENOMEM); | |
287 | ||
288 | nskb->sk = oskb->sk; | |
289 | skb = nskb; | |
290 | ||
291 | nfnl_lock(subsys_id); | |
292 | ss = rcu_dereference_protected(table[subsys_id].subsys, | |
293 | lockdep_is_held(&table[subsys_id].mutex)); | |
294 | if (!ss) { | |
295 | #ifdef CONFIG_MODULES | |
296 | nfnl_unlock(subsys_id); | |
297 | request_module("nfnetlink-subsys-%d", subsys_id); | |
298 | nfnl_lock(subsys_id); | |
299 | ss = rcu_dereference_protected(table[subsys_id].subsys, | |
300 | lockdep_is_held(&table[subsys_id].mutex)); | |
301 | if (!ss) | |
302 | #endif | |
303 | { | |
304 | nfnl_unlock(subsys_id); | |
ecd15dd7 DF |
305 | netlink_ack(skb, nlh, -EOPNOTSUPP); |
306 | return kfree_skb(nskb); | |
0628b123 PNA |
307 | } |
308 | } | |
309 | ||
310 | if (!ss->commit || !ss->abort) { | |
311 | nfnl_unlock(subsys_id); | |
ecd15dd7 DF |
312 | netlink_ack(skb, nlh, -EOPNOTSUPP); |
313 | return kfree_skb(skb); | |
0628b123 PNA |
314 | } |
315 | ||
316 | while (skb->len >= nlmsg_total_size(0)) { | |
317 | int msglen, type; | |
318 | ||
319 | nlh = nlmsg_hdr(skb); | |
320 | err = 0; | |
321 | ||
322 | if (nlh->nlmsg_len < NLMSG_HDRLEN) { | |
323 | err = -EINVAL; | |
324 | goto ack; | |
325 | } | |
326 | ||
327 | /* Only requests are handled by the kernel */ | |
328 | if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) { | |
329 | err = -EINVAL; | |
330 | goto ack; | |
331 | } | |
332 | ||
333 | type = nlh->nlmsg_type; | |
334 | if (type == NFNL_MSG_BATCH_BEGIN) { | |
335 | /* Malformed: Batch begin twice */ | |
cbb8125e | 336 | nfnl_err_reset(&err_list); |
0628b123 PNA |
337 | success = false; |
338 | goto done; | |
339 | } else if (type == NFNL_MSG_BATCH_END) { | |
340 | done = true; | |
341 | goto done; | |
342 | } else if (type < NLMSG_MIN_TYPE) { | |
343 | err = -EINVAL; | |
344 | goto ack; | |
345 | } | |
346 | ||
347 | /* We only accept a batch with messages for the same | |
348 | * subsystem. | |
349 | */ | |
350 | if (NFNL_SUBSYS_ID(type) != subsys_id) { | |
351 | err = -EINVAL; | |
352 | goto ack; | |
353 | } | |
354 | ||
355 | nc = nfnetlink_find_client(type, ss); | |
356 | if (!nc) { | |
357 | err = -EINVAL; | |
358 | goto ack; | |
359 | } | |
360 | ||
361 | { | |
362 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); | |
363 | u_int8_t cb_id = NFNL_MSG_TYPE(nlh->nlmsg_type); | |
364 | struct nlattr *cda[ss->cb[cb_id].attr_count + 1]; | |
365 | struct nlattr *attr = (void *)nlh + min_len; | |
366 | int attrlen = nlh->nlmsg_len - min_len; | |
367 | ||
368 | err = nla_parse(cda, ss->cb[cb_id].attr_count, | |
369 | attr, attrlen, ss->cb[cb_id].policy); | |
370 | if (err < 0) | |
371 | goto ack; | |
372 | ||
373 | if (nc->call_batch) { | |
374 | err = nc->call_batch(net->nfnl, skb, nlh, | |
375 | (const struct nlattr **)cda); | |
376 | } | |
377 | ||
378 | /* The lock was released to autoload some module, we | |
379 | * have to abort and start from scratch using the | |
380 | * original skb. | |
381 | */ | |
382 | if (err == -EAGAIN) { | |
cbb8125e | 383 | nfnl_err_reset(&err_list); |
fc04733a | 384 | ss->abort(oskb); |
0628b123 PNA |
385 | nfnl_unlock(subsys_id); |
386 | kfree_skb(nskb); | |
387 | goto replay; | |
388 | } | |
389 | } | |
390 | ack: | |
391 | if (nlh->nlmsg_flags & NLM_F_ACK || err) { | |
cbb8125e PNA |
392 | /* Errors are delivered once the full batch has been |
393 | * processed, this avoids that the same error is | |
394 | * reported several times when replaying the batch. | |
395 | */ | |
396 | if (nfnl_err_add(&err_list, nlh, err) < 0) { | |
397 | /* We failed to enqueue an error, reset the | |
398 | * list of errors and send OOM to userspace | |
399 | * pointing to the batch header. | |
400 | */ | |
401 | nfnl_err_reset(&err_list); | |
402 | netlink_ack(skb, nlmsg_hdr(oskb), -ENOMEM); | |
403 | success = false; | |
404 | goto done; | |
405 | } | |
0628b123 PNA |
406 | /* We don't stop processing the batch on errors, thus, |
407 | * userspace gets all the errors that the batch | |
408 | * triggers. | |
409 | */ | |
0628b123 PNA |
410 | if (err) |
411 | success = false; | |
412 | } | |
413 | ||
414 | msglen = NLMSG_ALIGN(nlh->nlmsg_len); | |
415 | if (msglen > skb->len) | |
416 | msglen = skb->len; | |
417 | skb_pull(skb, msglen); | |
418 | } | |
419 | done: | |
420 | if (success && done) | |
fc04733a | 421 | ss->commit(oskb); |
0628b123 | 422 | else |
fc04733a | 423 | ss->abort(oskb); |
0628b123 | 424 | |
cbb8125e | 425 | nfnl_err_deliver(&err_list, oskb); |
0628b123 PNA |
426 | nfnl_unlock(subsys_id); |
427 | kfree_skb(nskb); | |
428 | } | |
429 | ||
cd40b7d3 | 430 | static void nfnetlink_rcv(struct sk_buff *skb) |
f9e815b3 | 431 | { |
0628b123 | 432 | struct nlmsghdr *nlh = nlmsg_hdr(skb); |
0628b123 PNA |
433 | int msglen; |
434 | ||
0628b123 PNA |
435 | if (nlh->nlmsg_len < NLMSG_HDRLEN || |
436 | skb->len < nlh->nlmsg_len) | |
437 | return; | |
438 | ||
90f62cf3 | 439 | if (!netlink_net_capable(skb, CAP_NET_ADMIN)) { |
cdbe7c2d JB |
440 | netlink_ack(skb, nlh, -EPERM); |
441 | return; | |
442 | } | |
443 | ||
0628b123 PNA |
444 | if (nlh->nlmsg_type == NFNL_MSG_BATCH_BEGIN) { |
445 | struct nfgenmsg *nfgenmsg; | |
446 | ||
447 | msglen = NLMSG_ALIGN(nlh->nlmsg_len); | |
448 | if (msglen > skb->len) | |
449 | msglen = skb->len; | |
450 | ||
451 | if (nlh->nlmsg_len < NLMSG_HDRLEN || | |
452 | skb->len < NLMSG_HDRLEN + sizeof(struct nfgenmsg)) | |
453 | return; | |
454 | ||
455 | nfgenmsg = nlmsg_data(nlh); | |
456 | skb_pull(skb, msglen); | |
457 | nfnetlink_rcv_batch(skb, nlh, nfgenmsg->res_id); | |
458 | } else { | |
459 | netlink_rcv_skb(skb, &nfnetlink_rcv_msg); | |
460 | } | |
f9e815b3 HW |
461 | } |
462 | ||
03292745 | 463 | #ifdef CONFIG_MODULES |
4f520900 | 464 | static int nfnetlink_bind(int group) |
03292745 PNA |
465 | { |
466 | const struct nfnetlink_subsystem *ss; | |
467 | int type = nfnl_group2type[group]; | |
468 | ||
469 | rcu_read_lock(); | |
470 | ss = nfnetlink_get_subsys(type); | |
03292745 | 471 | rcu_read_unlock(); |
bfe4bc71 RGB |
472 | if (!ss) |
473 | request_module("nfnetlink-subsys-%d", type); | |
4f520900 | 474 | return 0; |
03292745 PNA |
475 | } |
476 | #endif | |
477 | ||
cd8c20b6 | 478 | static int __net_init nfnetlink_net_init(struct net *net) |
f9e815b3 | 479 | { |
cd8c20b6 | 480 | struct sock *nfnl; |
a31f2d17 PNA |
481 | struct netlink_kernel_cfg cfg = { |
482 | .groups = NFNLGRP_MAX, | |
483 | .input = nfnetlink_rcv, | |
03292745 PNA |
484 | #ifdef CONFIG_MODULES |
485 | .bind = nfnetlink_bind, | |
486 | #endif | |
a31f2d17 | 487 | }; |
cd8c20b6 | 488 | |
9f00d977 | 489 | nfnl = netlink_kernel_create(net, NETLINK_NETFILTER, &cfg); |
cd8c20b6 AD |
490 | if (!nfnl) |
491 | return -ENOMEM; | |
492 | net->nfnl_stash = nfnl; | |
cf778b00 | 493 | rcu_assign_pointer(net->nfnl, nfnl); |
cd8c20b6 | 494 | return 0; |
f9e815b3 HW |
495 | } |
496 | ||
cd8c20b6 | 497 | static void __net_exit nfnetlink_net_exit_batch(struct list_head *net_exit_list) |
f9e815b3 | 498 | { |
cd8c20b6 | 499 | struct net *net; |
f9e815b3 | 500 | |
cd8c20b6 | 501 | list_for_each_entry(net, net_exit_list, exit_list) |
a9b3cd7f | 502 | RCU_INIT_POINTER(net->nfnl, NULL); |
cd8c20b6 AD |
503 | synchronize_net(); |
504 | list_for_each_entry(net, net_exit_list, exit_list) | |
505 | netlink_kernel_release(net->nfnl_stash); | |
506 | } | |
f9e815b3 | 507 | |
cd8c20b6 AD |
508 | static struct pernet_operations nfnetlink_net_ops = { |
509 | .init = nfnetlink_net_init, | |
510 | .exit_batch = nfnetlink_net_exit_batch, | |
511 | }; | |
512 | ||
513 | static int __init nfnetlink_init(void) | |
514 | { | |
c14b78e7 PNA |
515 | int i; |
516 | ||
517 | for (i=0; i<NFNL_SUBSYS_COUNT; i++) | |
518 | mutex_init(&table[i].mutex); | |
519 | ||
654d0fbd | 520 | pr_info("Netfilter messages via NETLINK v%s.\n", nfversion); |
cd8c20b6 | 521 | return register_pernet_subsys(&nfnetlink_net_ops); |
f9e815b3 HW |
522 | } |
523 | ||
cd8c20b6 AD |
524 | static void __exit nfnetlink_exit(void) |
525 | { | |
654d0fbd | 526 | pr_info("Removing netfilter NETLINK layer.\n"); |
cd8c20b6 AD |
527 | unregister_pernet_subsys(&nfnetlink_net_ops); |
528 | } | |
f9e815b3 HW |
529 | module_init(nfnetlink_init); |
530 | module_exit(nfnetlink_exit); |