Root/
1 | /* |
2 | * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org> |
3 | * (C) 2012 by Vyatta Inc. <http://www.vyatta.com> |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License version 2 as |
7 | * published by the Free Software Foundation (or any later at your option). |
8 | */ |
9 | #include <linux/init.h> |
10 | #include <linux/module.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/rculist.h> |
13 | #include <linux/rculist_nulls.h> |
14 | #include <linux/types.h> |
15 | #include <linux/timer.h> |
16 | #include <linux/security.h> |
17 | #include <linux/skbuff.h> |
18 | #include <linux/errno.h> |
19 | #include <linux/netlink.h> |
20 | #include <linux/spinlock.h> |
21 | #include <linux/interrupt.h> |
22 | #include <linux/slab.h> |
23 | |
24 | #include <linux/netfilter.h> |
25 | #include <net/netlink.h> |
26 | #include <net/sock.h> |
27 | #include <net/netfilter/nf_conntrack.h> |
28 | #include <net/netfilter/nf_conntrack_core.h> |
29 | #include <net/netfilter/nf_conntrack_l3proto.h> |
30 | #include <net/netfilter/nf_conntrack_l4proto.h> |
31 | #include <net/netfilter/nf_conntrack_tuple.h> |
32 | #include <net/netfilter/nf_conntrack_timeout.h> |
33 | |
34 | #include <linux/netfilter/nfnetlink.h> |
35 | #include <linux/netfilter/nfnetlink_cttimeout.h> |
36 | |
37 | MODULE_LICENSE("GPL"); |
38 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
39 | MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tuning"); |
40 | |
41 | static LIST_HEAD(cttimeout_list); |
42 | |
43 | static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = { |
44 | [CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING, |
45 | .len = CTNL_TIMEOUT_NAME_MAX - 1}, |
46 | [CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 }, |
47 | [CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 }, |
48 | [CTA_TIMEOUT_DATA] = { .type = NLA_NESTED }, |
49 | }; |
50 | |
51 | static int |
52 | ctnl_timeout_parse_policy(void *timeouts, struct nf_conntrack_l4proto *l4proto, |
53 | struct net *net, const struct nlattr *attr) |
54 | { |
55 | int ret = 0; |
56 | |
57 | if (likely(l4proto->ctnl_timeout.nlattr_to_obj)) { |
58 | struct nlattr *tb[l4proto->ctnl_timeout.nlattr_max+1]; |
59 | |
60 | ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max, |
61 | attr, l4proto->ctnl_timeout.nla_policy); |
62 | if (ret < 0) |
63 | return ret; |
64 | |
65 | ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts); |
66 | } |
67 | return ret; |
68 | } |
69 | |
70 | static int |
71 | cttimeout_new_timeout(struct sock *ctnl, struct sk_buff *skb, |
72 | const struct nlmsghdr *nlh, |
73 | const struct nlattr * const cda[]) |
74 | { |
75 | __u16 l3num; |
76 | __u8 l4num; |
77 | struct nf_conntrack_l4proto *l4proto; |
78 | struct ctnl_timeout *timeout, *matching = NULL; |
79 | struct net *net = sock_net(skb->sk); |
80 | char *name; |
81 | int ret; |
82 | |
83 | if (!cda[CTA_TIMEOUT_NAME] || |
84 | !cda[CTA_TIMEOUT_L3PROTO] || |
85 | !cda[CTA_TIMEOUT_L4PROTO] || |
86 | !cda[CTA_TIMEOUT_DATA]) |
87 | return -EINVAL; |
88 | |
89 | name = nla_data(cda[CTA_TIMEOUT_NAME]); |
90 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); |
91 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); |
92 | |
93 | list_for_each_entry(timeout, &cttimeout_list, head) { |
94 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
95 | continue; |
96 | |
97 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
98 | return -EEXIST; |
99 | |
100 | matching = timeout; |
101 | break; |
102 | } |
103 | |
104 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); |
105 | |
106 | /* This protocol is not supportted, skip. */ |
107 | if (l4proto->l4proto != l4num) { |
108 | ret = -EOPNOTSUPP; |
109 | goto err_proto_put; |
110 | } |
111 | |
112 | if (matching) { |
113 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
114 | /* You cannot replace one timeout policy by another of |
115 | * different kind, sorry. |
116 | */ |
117 | if (matching->l3num != l3num || |
118 | matching->l4proto->l4proto != l4num) { |
119 | ret = -EINVAL; |
120 | goto err_proto_put; |
121 | } |
122 | |
123 | ret = ctnl_timeout_parse_policy(&matching->data, |
124 | l4proto, net, |
125 | cda[CTA_TIMEOUT_DATA]); |
126 | return ret; |
127 | } |
128 | ret = -EBUSY; |
129 | goto err_proto_put; |
130 | } |
131 | |
132 | timeout = kzalloc(sizeof(struct ctnl_timeout) + |
133 | l4proto->ctnl_timeout.obj_size, GFP_KERNEL); |
134 | if (timeout == NULL) { |
135 | ret = -ENOMEM; |
136 | goto err_proto_put; |
137 | } |
138 | |
139 | ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net, |
140 | cda[CTA_TIMEOUT_DATA]); |
141 | if (ret < 0) |
142 | goto err; |
143 | |
144 | strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME])); |
145 | timeout->l3num = l3num; |
146 | timeout->l4proto = l4proto; |
147 | atomic_set(&timeout->refcnt, 1); |
148 | list_add_tail_rcu(&timeout->head, &cttimeout_list); |
149 | |
150 | return 0; |
151 | err: |
152 | kfree(timeout); |
153 | err_proto_put: |
154 | nf_ct_l4proto_put(l4proto); |
155 | return ret; |
156 | } |
157 | |
158 | static int |
159 | ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
160 | int event, struct ctnl_timeout *timeout) |
161 | { |
162 | struct nlmsghdr *nlh; |
163 | struct nfgenmsg *nfmsg; |
164 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
165 | struct nf_conntrack_l4proto *l4proto = timeout->l4proto; |
166 | |
167 | event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; |
168 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
169 | if (nlh == NULL) |
170 | goto nlmsg_failure; |
171 | |
172 | nfmsg = nlmsg_data(nlh); |
173 | nfmsg->nfgen_family = AF_UNSPEC; |
174 | nfmsg->version = NFNETLINK_V0; |
175 | nfmsg->res_id = 0; |
176 | |
177 | if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) || |
178 | nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) || |
179 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) || |
180 | nla_put_be32(skb, CTA_TIMEOUT_USE, |
181 | htonl(atomic_read(&timeout->refcnt)))) |
182 | goto nla_put_failure; |
183 | |
184 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { |
185 | struct nlattr *nest_parms; |
186 | int ret; |
187 | |
188 | nest_parms = nla_nest_start(skb, |
189 | CTA_TIMEOUT_DATA | NLA_F_NESTED); |
190 | if (!nest_parms) |
191 | goto nla_put_failure; |
192 | |
193 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data); |
194 | if (ret < 0) |
195 | goto nla_put_failure; |
196 | |
197 | nla_nest_end(skb, nest_parms); |
198 | } |
199 | |
200 | nlmsg_end(skb, nlh); |
201 | return skb->len; |
202 | |
203 | nlmsg_failure: |
204 | nla_put_failure: |
205 | nlmsg_cancel(skb, nlh); |
206 | return -1; |
207 | } |
208 | |
209 | static int |
210 | ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb) |
211 | { |
212 | struct ctnl_timeout *cur, *last; |
213 | |
214 | if (cb->args[2]) |
215 | return 0; |
216 | |
217 | last = (struct ctnl_timeout *)cb->args[1]; |
218 | if (cb->args[1]) |
219 | cb->args[1] = 0; |
220 | |
221 | rcu_read_lock(); |
222 | list_for_each_entry_rcu(cur, &cttimeout_list, head) { |
223 | if (last) { |
224 | if (cur != last) |
225 | continue; |
226 | |
227 | last = NULL; |
228 | } |
229 | if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid, |
230 | cb->nlh->nlmsg_seq, |
231 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), |
232 | IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) { |
233 | cb->args[1] = (unsigned long)cur; |
234 | break; |
235 | } |
236 | } |
237 | if (!cb->args[1]) |
238 | cb->args[2] = 1; |
239 | rcu_read_unlock(); |
240 | return skb->len; |
241 | } |
242 | |
243 | static int |
244 | cttimeout_get_timeout(struct sock *ctnl, struct sk_buff *skb, |
245 | const struct nlmsghdr *nlh, |
246 | const struct nlattr * const cda[]) |
247 | { |
248 | int ret = -ENOENT; |
249 | char *name; |
250 | struct ctnl_timeout *cur; |
251 | |
252 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
253 | struct netlink_dump_control c = { |
254 | .dump = ctnl_timeout_dump, |
255 | }; |
256 | return netlink_dump_start(ctnl, skb, nlh, &c); |
257 | } |
258 | |
259 | if (!cda[CTA_TIMEOUT_NAME]) |
260 | return -EINVAL; |
261 | name = nla_data(cda[CTA_TIMEOUT_NAME]); |
262 | |
263 | list_for_each_entry(cur, &cttimeout_list, head) { |
264 | struct sk_buff *skb2; |
265 | |
266 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
267 | continue; |
268 | |
269 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
270 | if (skb2 == NULL) { |
271 | ret = -ENOMEM; |
272 | break; |
273 | } |
274 | |
275 | ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid, |
276 | nlh->nlmsg_seq, |
277 | NFNL_MSG_TYPE(nlh->nlmsg_type), |
278 | IPCTNL_MSG_TIMEOUT_NEW, cur); |
279 | if (ret <= 0) { |
280 | kfree_skb(skb2); |
281 | break; |
282 | } |
283 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, |
284 | MSG_DONTWAIT); |
285 | if (ret > 0) |
286 | ret = 0; |
287 | |
288 | /* this avoids a loop in nfnetlink. */ |
289 | return ret == -EAGAIN ? -ENOBUFS : ret; |
290 | } |
291 | return ret; |
292 | } |
293 | |
294 | /* try to delete object, fail if it is still in use. */ |
295 | static int ctnl_timeout_try_del(struct ctnl_timeout *timeout) |
296 | { |
297 | int ret = 0; |
298 | |
299 | /* we want to avoid races with nf_ct_timeout_find_get. */ |
300 | if (atomic_dec_and_test(&timeout->refcnt)) { |
301 | /* We are protected by nfnl mutex. */ |
302 | list_del_rcu(&timeout->head); |
303 | nf_ct_l4proto_put(timeout->l4proto); |
304 | kfree_rcu(timeout, rcu_head); |
305 | } else { |
306 | /* still in use, restore reference counter. */ |
307 | atomic_inc(&timeout->refcnt); |
308 | ret = -EBUSY; |
309 | } |
310 | return ret; |
311 | } |
312 | |
313 | static int |
314 | cttimeout_del_timeout(struct sock *ctnl, struct sk_buff *skb, |
315 | const struct nlmsghdr *nlh, |
316 | const struct nlattr * const cda[]) |
317 | { |
318 | char *name; |
319 | struct ctnl_timeout *cur; |
320 | int ret = -ENOENT; |
321 | |
322 | if (!cda[CTA_TIMEOUT_NAME]) { |
323 | list_for_each_entry(cur, &cttimeout_list, head) |
324 | ctnl_timeout_try_del(cur); |
325 | |
326 | return 0; |
327 | } |
328 | name = nla_data(cda[CTA_TIMEOUT_NAME]); |
329 | |
330 | list_for_each_entry(cur, &cttimeout_list, head) { |
331 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
332 | continue; |
333 | |
334 | ret = ctnl_timeout_try_del(cur); |
335 | if (ret < 0) |
336 | return ret; |
337 | |
338 | break; |
339 | } |
340 | return ret; |
341 | } |
342 | |
343 | static int |
344 | cttimeout_default_set(struct sock *ctnl, struct sk_buff *skb, |
345 | const struct nlmsghdr *nlh, |
346 | const struct nlattr * const cda[]) |
347 | { |
348 | __u16 l3num; |
349 | __u8 l4num; |
350 | struct nf_conntrack_l4proto *l4proto; |
351 | struct net *net = sock_net(skb->sk); |
352 | unsigned int *timeouts; |
353 | int ret; |
354 | |
355 | if (!cda[CTA_TIMEOUT_L3PROTO] || |
356 | !cda[CTA_TIMEOUT_L4PROTO] || |
357 | !cda[CTA_TIMEOUT_DATA]) |
358 | return -EINVAL; |
359 | |
360 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); |
361 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); |
362 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); |
363 | |
364 | /* This protocol is not supported, skip. */ |
365 | if (l4proto->l4proto != l4num) { |
366 | ret = -EOPNOTSUPP; |
367 | goto err; |
368 | } |
369 | |
370 | timeouts = l4proto->get_timeouts(net); |
371 | |
372 | ret = ctnl_timeout_parse_policy(timeouts, l4proto, net, |
373 | cda[CTA_TIMEOUT_DATA]); |
374 | if (ret < 0) |
375 | goto err; |
376 | |
377 | nf_ct_l4proto_put(l4proto); |
378 | return 0; |
379 | err: |
380 | nf_ct_l4proto_put(l4proto); |
381 | return ret; |
382 | } |
383 | |
384 | static int |
385 | cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid, |
386 | u32 seq, u32 type, int event, |
387 | struct nf_conntrack_l4proto *l4proto) |
388 | { |
389 | struct nlmsghdr *nlh; |
390 | struct nfgenmsg *nfmsg; |
391 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
392 | |
393 | event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; |
394 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
395 | if (nlh == NULL) |
396 | goto nlmsg_failure; |
397 | |
398 | nfmsg = nlmsg_data(nlh); |
399 | nfmsg->nfgen_family = AF_UNSPEC; |
400 | nfmsg->version = NFNETLINK_V0; |
401 | nfmsg->res_id = 0; |
402 | |
403 | if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l4proto->l3proto)) || |
404 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto)) |
405 | goto nla_put_failure; |
406 | |
407 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { |
408 | struct nlattr *nest_parms; |
409 | unsigned int *timeouts = l4proto->get_timeouts(net); |
410 | int ret; |
411 | |
412 | nest_parms = nla_nest_start(skb, |
413 | CTA_TIMEOUT_DATA | NLA_F_NESTED); |
414 | if (!nest_parms) |
415 | goto nla_put_failure; |
416 | |
417 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts); |
418 | if (ret < 0) |
419 | goto nla_put_failure; |
420 | |
421 | nla_nest_end(skb, nest_parms); |
422 | } |
423 | |
424 | nlmsg_end(skb, nlh); |
425 | return skb->len; |
426 | |
427 | nlmsg_failure: |
428 | nla_put_failure: |
429 | nlmsg_cancel(skb, nlh); |
430 | return -1; |
431 | } |
432 | |
433 | static int cttimeout_default_get(struct sock *ctnl, struct sk_buff *skb, |
434 | const struct nlmsghdr *nlh, |
435 | const struct nlattr * const cda[]) |
436 | { |
437 | __u16 l3num; |
438 | __u8 l4num; |
439 | struct nf_conntrack_l4proto *l4proto; |
440 | struct net *net = sock_net(skb->sk); |
441 | struct sk_buff *skb2; |
442 | int ret, err; |
443 | |
444 | if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO]) |
445 | return -EINVAL; |
446 | |
447 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); |
448 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); |
449 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); |
450 | |
451 | /* This protocol is not supported, skip. */ |
452 | if (l4proto->l4proto != l4num) { |
453 | err = -EOPNOTSUPP; |
454 | goto err; |
455 | } |
456 | |
457 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
458 | if (skb2 == NULL) { |
459 | err = -ENOMEM; |
460 | goto err; |
461 | } |
462 | |
463 | ret = cttimeout_default_fill_info(net, skb2, NETLINK_CB(skb).portid, |
464 | nlh->nlmsg_seq, |
465 | NFNL_MSG_TYPE(nlh->nlmsg_type), |
466 | IPCTNL_MSG_TIMEOUT_DEFAULT_SET, |
467 | l4proto); |
468 | if (ret <= 0) { |
469 | kfree_skb(skb2); |
470 | err = -ENOMEM; |
471 | goto err; |
472 | } |
473 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
474 | if (ret > 0) |
475 | ret = 0; |
476 | |
477 | /* this avoids a loop in nfnetlink. */ |
478 | return ret == -EAGAIN ? -ENOBUFS : ret; |
479 | err: |
480 | nf_ct_l4proto_put(l4proto); |
481 | return err; |
482 | } |
483 | |
484 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
485 | static struct ctnl_timeout *ctnl_timeout_find_get(const char *name) |
486 | { |
487 | struct ctnl_timeout *timeout, *matching = NULL; |
488 | |
489 | rcu_read_lock(); |
490 | list_for_each_entry_rcu(timeout, &cttimeout_list, head) { |
491 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
492 | continue; |
493 | |
494 | if (!try_module_get(THIS_MODULE)) |
495 | goto err; |
496 | |
497 | if (!atomic_inc_not_zero(&timeout->refcnt)) { |
498 | module_put(THIS_MODULE); |
499 | goto err; |
500 | } |
501 | matching = timeout; |
502 | break; |
503 | } |
504 | err: |
505 | rcu_read_unlock(); |
506 | return matching; |
507 | } |
508 | |
509 | static void ctnl_timeout_put(struct ctnl_timeout *timeout) |
510 | { |
511 | atomic_dec(&timeout->refcnt); |
512 | module_put(THIS_MODULE); |
513 | } |
514 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
515 | |
516 | static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = { |
517 | [IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout, |
518 | .attr_count = CTA_TIMEOUT_MAX, |
519 | .policy = cttimeout_nla_policy }, |
520 | [IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout, |
521 | .attr_count = CTA_TIMEOUT_MAX, |
522 | .policy = cttimeout_nla_policy }, |
523 | [IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout, |
524 | .attr_count = CTA_TIMEOUT_MAX, |
525 | .policy = cttimeout_nla_policy }, |
526 | [IPCTNL_MSG_TIMEOUT_DEFAULT_SET]= { .call = cttimeout_default_set, |
527 | .attr_count = CTA_TIMEOUT_MAX, |
528 | .policy = cttimeout_nla_policy }, |
529 | [IPCTNL_MSG_TIMEOUT_DEFAULT_GET]= { .call = cttimeout_default_get, |
530 | .attr_count = CTA_TIMEOUT_MAX, |
531 | .policy = cttimeout_nla_policy }, |
532 | }; |
533 | |
534 | static const struct nfnetlink_subsystem cttimeout_subsys = { |
535 | .name = "conntrack_timeout", |
536 | .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT, |
537 | .cb_count = IPCTNL_MSG_TIMEOUT_MAX, |
538 | .cb = cttimeout_cb, |
539 | }; |
540 | |
541 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT); |
542 | |
543 | static int __init cttimeout_init(void) |
544 | { |
545 | int ret; |
546 | |
547 | ret = nfnetlink_subsys_register(&cttimeout_subsys); |
548 | if (ret < 0) { |
549 | pr_err("cttimeout_init: cannot register cttimeout with " |
550 | "nfnetlink.\n"); |
551 | goto err_out; |
552 | } |
553 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
554 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get); |
555 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put); |
556 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
557 | return 0; |
558 | |
559 | err_out: |
560 | return ret; |
561 | } |
562 | |
563 | static void __exit cttimeout_exit(void) |
564 | { |
565 | struct ctnl_timeout *cur, *tmp; |
566 | |
567 | pr_info("cttimeout: unregistering from nfnetlink.\n"); |
568 | |
569 | nfnetlink_subsys_unregister(&cttimeout_subsys); |
570 | list_for_each_entry_safe(cur, tmp, &cttimeout_list, head) { |
571 | list_del_rcu(&cur->head); |
572 | /* We are sure that our objects have no clients at this point, |
573 | * it's safe to release them all without checking refcnt. |
574 | */ |
575 | nf_ct_l4proto_put(cur->l4proto); |
576 | kfree_rcu(cur, rcu_head); |
577 | } |
578 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
579 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL); |
580 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL); |
581 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
582 | } |
583 | |
584 | module_init(cttimeout_init); |
585 | module_exit(cttimeout_exit); |
586 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
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jz-2.6.39
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jz-3.11
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jz-3.15
jz-3.16
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jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9