Commit | Line | Data |
---|---|---|
50978462 PNA |
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> | |
24de58f4 | 32 | #include <net/netfilter/nf_conntrack_timeout.h> |
50978462 PNA |
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 | ||
50978462 | 41 | static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = { |
e93b5f9f FW |
42 | [CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING, |
43 | .len = CTNL_TIMEOUT_NAME_MAX - 1}, | |
50978462 PNA |
44 | [CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 }, |
45 | [CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 }, | |
46 | [CTA_TIMEOUT_DATA] = { .type = NLA_NESTED }, | |
47 | }; | |
48 | ||
49 | static int | |
91cb498e PNA |
50 | ctnl_timeout_parse_policy(void *timeouts, struct nf_conntrack_l4proto *l4proto, |
51 | struct net *net, const struct nlattr *attr) | |
50978462 PNA |
52 | { |
53 | int ret = 0; | |
54 | ||
55 | if (likely(l4proto->ctnl_timeout.nlattr_to_obj)) { | |
56 | struct nlattr *tb[l4proto->ctnl_timeout.nlattr_max+1]; | |
57 | ||
130ffbc2 DB |
58 | ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max, |
59 | attr, l4proto->ctnl_timeout.nla_policy); | |
60 | if (ret < 0) | |
61 | return ret; | |
50978462 | 62 | |
91cb498e | 63 | ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts); |
50978462 PNA |
64 | } |
65 | return ret; | |
66 | } | |
67 | ||
7b8002a1 PNA |
68 | static int cttimeout_new_timeout(struct net *net, struct sock *ctnl, |
69 | struct sk_buff *skb, | |
70 | const struct nlmsghdr *nlh, | |
71 | const struct nlattr * const cda[]) | |
50978462 PNA |
72 | { |
73 | __u16 l3num; | |
74 | __u8 l4num; | |
75 | struct nf_conntrack_l4proto *l4proto; | |
76 | struct ctnl_timeout *timeout, *matching = NULL; | |
77 | char *name; | |
78 | int ret; | |
79 | ||
80 | if (!cda[CTA_TIMEOUT_NAME] || | |
81 | !cda[CTA_TIMEOUT_L3PROTO] || | |
82 | !cda[CTA_TIMEOUT_L4PROTO] || | |
83 | !cda[CTA_TIMEOUT_DATA]) | |
84 | return -EINVAL; | |
85 | ||
86 | name = nla_data(cda[CTA_TIMEOUT_NAME]); | |
87 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); | |
88 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); | |
89 | ||
19576c94 | 90 | list_for_each_entry(timeout, &net->nfct_timeout_list, head) { |
50978462 PNA |
91 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
92 | continue; | |
93 | ||
94 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
95 | return -EEXIST; | |
96 | ||
97 | matching = timeout; | |
98 | break; | |
99 | } | |
100 | ||
c1ebd7df | 101 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); |
50978462 PNA |
102 | |
103 | /* This protocol is not supportted, skip. */ | |
c1ebd7df PNA |
104 | if (l4proto->l4proto != l4num) { |
105 | ret = -EOPNOTSUPP; | |
106 | goto err_proto_put; | |
107 | } | |
50978462 PNA |
108 | |
109 | if (matching) { | |
110 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { | |
111 | /* You cannot replace one timeout policy by another of | |
112 | * different kind, sorry. | |
113 | */ | |
114 | if (matching->l3num != l3num || | |
c1ebd7df PNA |
115 | matching->l4proto->l4proto != l4num) { |
116 | ret = -EINVAL; | |
117 | goto err_proto_put; | |
118 | } | |
50978462 | 119 | |
91cb498e PNA |
120 | ret = ctnl_timeout_parse_policy(&matching->data, |
121 | l4proto, net, | |
50978462 PNA |
122 | cda[CTA_TIMEOUT_DATA]); |
123 | return ret; | |
124 | } | |
c1ebd7df PNA |
125 | ret = -EBUSY; |
126 | goto err_proto_put; | |
50978462 PNA |
127 | } |
128 | ||
129 | timeout = kzalloc(sizeof(struct ctnl_timeout) + | |
130 | l4proto->ctnl_timeout.obj_size, GFP_KERNEL); | |
c1ebd7df PNA |
131 | if (timeout == NULL) { |
132 | ret = -ENOMEM; | |
133 | goto err_proto_put; | |
134 | } | |
50978462 | 135 | |
91cb498e | 136 | ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net, |
50978462 PNA |
137 | cda[CTA_TIMEOUT_DATA]); |
138 | if (ret < 0) | |
139 | goto err; | |
140 | ||
141 | strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME])); | |
142 | timeout->l3num = l3num; | |
c1ebd7df | 143 | timeout->l4proto = l4proto; |
50978462 | 144 | atomic_set(&timeout->refcnt, 1); |
19576c94 | 145 | list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list); |
50978462 PNA |
146 | |
147 | return 0; | |
148 | err: | |
149 | kfree(timeout); | |
c1ebd7df PNA |
150 | err_proto_put: |
151 | nf_ct_l4proto_put(l4proto); | |
50978462 PNA |
152 | return ret; |
153 | } | |
154 | ||
155 | static int | |
15e47304 | 156 | ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
50978462 PNA |
157 | int event, struct ctnl_timeout *timeout) |
158 | { | |
159 | struct nlmsghdr *nlh; | |
160 | struct nfgenmsg *nfmsg; | |
15e47304 | 161 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
c1ebd7df | 162 | struct nf_conntrack_l4proto *l4proto = timeout->l4proto; |
50978462 PNA |
163 | |
164 | event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; | |
15e47304 | 165 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
50978462 PNA |
166 | if (nlh == NULL) |
167 | goto nlmsg_failure; | |
168 | ||
169 | nfmsg = nlmsg_data(nlh); | |
170 | nfmsg->nfgen_family = AF_UNSPEC; | |
171 | nfmsg->version = NFNETLINK_V0; | |
172 | nfmsg->res_id = 0; | |
173 | ||
48f03bda DM |
174 | if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) || |
175 | nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) || | |
176 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) || | |
177 | nla_put_be32(skb, CTA_TIMEOUT_USE, | |
178 | htonl(atomic_read(&timeout->refcnt)))) | |
179 | goto nla_put_failure; | |
50978462 | 180 | |
50978462 PNA |
181 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { |
182 | struct nlattr *nest_parms; | |
183 | int ret; | |
184 | ||
185 | nest_parms = nla_nest_start(skb, | |
186 | CTA_TIMEOUT_DATA | NLA_F_NESTED); | |
187 | if (!nest_parms) | |
188 | goto nla_put_failure; | |
189 | ||
190 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data); | |
191 | if (ret < 0) | |
192 | goto nla_put_failure; | |
193 | ||
194 | nla_nest_end(skb, nest_parms); | |
195 | } | |
c1ebd7df | 196 | |
50978462 PNA |
197 | nlmsg_end(skb, nlh); |
198 | return skb->len; | |
199 | ||
200 | nlmsg_failure: | |
201 | nla_put_failure: | |
202 | nlmsg_cancel(skb, nlh); | |
203 | return -1; | |
204 | } | |
205 | ||
206 | static int | |
207 | ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
208 | { | |
19576c94 | 209 | struct net *net = sock_net(skb->sk); |
50978462 PNA |
210 | struct ctnl_timeout *cur, *last; |
211 | ||
212 | if (cb->args[2]) | |
213 | return 0; | |
214 | ||
215 | last = (struct ctnl_timeout *)cb->args[1]; | |
216 | if (cb->args[1]) | |
217 | cb->args[1] = 0; | |
218 | ||
219 | rcu_read_lock(); | |
19576c94 | 220 | list_for_each_entry_rcu(cur, &net->nfct_timeout_list, head) { |
37bc4f8d PNA |
221 | if (last) { |
222 | if (cur != last) | |
223 | continue; | |
50978462 | 224 | |
37bc4f8d PNA |
225 | last = NULL; |
226 | } | |
15e47304 | 227 | if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid, |
50978462 PNA |
228 | cb->nlh->nlmsg_seq, |
229 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), | |
230 | IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) { | |
231 | cb->args[1] = (unsigned long)cur; | |
232 | break; | |
233 | } | |
234 | } | |
235 | if (!cb->args[1]) | |
236 | cb->args[2] = 1; | |
237 | rcu_read_unlock(); | |
238 | return skb->len; | |
239 | } | |
240 | ||
7b8002a1 PNA |
241 | static int cttimeout_get_timeout(struct net *net, struct sock *ctnl, |
242 | struct sk_buff *skb, | |
243 | const struct nlmsghdr *nlh, | |
244 | const struct nlattr * const cda[]) | |
50978462 PNA |
245 | { |
246 | int ret = -ENOENT; | |
247 | char *name; | |
248 | struct ctnl_timeout *cur; | |
249 | ||
250 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
251 | struct netlink_dump_control c = { | |
252 | .dump = ctnl_timeout_dump, | |
253 | }; | |
254 | return netlink_dump_start(ctnl, skb, nlh, &c); | |
255 | } | |
256 | ||
257 | if (!cda[CTA_TIMEOUT_NAME]) | |
258 | return -EINVAL; | |
259 | name = nla_data(cda[CTA_TIMEOUT_NAME]); | |
260 | ||
19576c94 | 261 | list_for_each_entry(cur, &net->nfct_timeout_list, head) { |
50978462 PNA |
262 | struct sk_buff *skb2; |
263 | ||
264 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) | |
265 | continue; | |
266 | ||
267 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
268 | if (skb2 == NULL) { | |
269 | ret = -ENOMEM; | |
270 | break; | |
271 | } | |
272 | ||
15e47304 | 273 | ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid, |
50978462 PNA |
274 | nlh->nlmsg_seq, |
275 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
276 | IPCTNL_MSG_TIMEOUT_NEW, cur); | |
277 | if (ret <= 0) { | |
278 | kfree_skb(skb2); | |
279 | break; | |
280 | } | |
15e47304 | 281 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, |
50978462 PNA |
282 | MSG_DONTWAIT); |
283 | if (ret > 0) | |
284 | ret = 0; | |
285 | ||
286 | /* this avoids a loop in nfnetlink. */ | |
287 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
288 | } | |
289 | return ret; | |
290 | } | |
291 | ||
ae2d708e PNA |
292 | static void untimeout(struct nf_conntrack_tuple_hash *i, |
293 | struct ctnl_timeout *timeout) | |
294 | { | |
295 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(i); | |
296 | struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct); | |
297 | ||
298 | if (timeout_ext && (!timeout || timeout_ext->timeout == timeout)) | |
299 | RCU_INIT_POINTER(timeout_ext->timeout, NULL); | |
300 | } | |
301 | ||
19576c94 | 302 | static void ctnl_untimeout(struct net *net, struct ctnl_timeout *timeout) |
ae2d708e PNA |
303 | { |
304 | struct nf_conntrack_tuple_hash *h; | |
305 | const struct hlist_nulls_node *nn; | |
306 | int i; | |
307 | ||
308 | local_bh_disable(); | |
56d52d48 | 309 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
b16c2919 | 310 | nf_conntrack_lock(&nf_conntrack_locks[i % CONNTRACK_LOCKS]); |
56d52d48 FW |
311 | if (i < nf_conntrack_htable_size) { |
312 | hlist_nulls_for_each_entry(h, nn, &nf_conntrack_hash[i], hnnode) | |
ae2d708e PNA |
313 | untimeout(h, timeout); |
314 | } | |
53c520c2 | 315 | spin_unlock(&nf_conntrack_locks[i % CONNTRACK_LOCKS]); |
ae2d708e PNA |
316 | } |
317 | local_bh_enable(); | |
318 | } | |
319 | ||
50978462 | 320 | /* try to delete object, fail if it is still in use. */ |
19576c94 | 321 | static int ctnl_timeout_try_del(struct net *net, struct ctnl_timeout *timeout) |
50978462 PNA |
322 | { |
323 | int ret = 0; | |
324 | ||
325 | /* we want to avoid races with nf_ct_timeout_find_get. */ | |
326 | if (atomic_dec_and_test(&timeout->refcnt)) { | |
327 | /* We are protected by nfnl mutex. */ | |
328 | list_del_rcu(&timeout->head); | |
c1ebd7df | 329 | nf_ct_l4proto_put(timeout->l4proto); |
19576c94 | 330 | ctnl_untimeout(net, timeout); |
50978462 PNA |
331 | kfree_rcu(timeout, rcu_head); |
332 | } else { | |
333 | /* still in use, restore reference counter. */ | |
334 | atomic_inc(&timeout->refcnt); | |
335 | ret = -EBUSY; | |
336 | } | |
337 | return ret; | |
338 | } | |
339 | ||
7b8002a1 PNA |
340 | static int cttimeout_del_timeout(struct net *net, struct sock *ctnl, |
341 | struct sk_buff *skb, | |
342 | const struct nlmsghdr *nlh, | |
343 | const struct nlattr * const cda[]) | |
50978462 | 344 | { |
50978462 PNA |
345 | struct ctnl_timeout *cur; |
346 | int ret = -ENOENT; | |
7b8002a1 | 347 | char *name; |
50978462 PNA |
348 | |
349 | if (!cda[CTA_TIMEOUT_NAME]) { | |
19576c94 PN |
350 | list_for_each_entry(cur, &net->nfct_timeout_list, head) |
351 | ctnl_timeout_try_del(net, cur); | |
50978462 PNA |
352 | |
353 | return 0; | |
354 | } | |
355 | name = nla_data(cda[CTA_TIMEOUT_NAME]); | |
356 | ||
19576c94 | 357 | list_for_each_entry(cur, &net->nfct_timeout_list, head) { |
50978462 PNA |
358 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
359 | continue; | |
360 | ||
19576c94 | 361 | ret = ctnl_timeout_try_del(net, cur); |
50978462 PNA |
362 | if (ret < 0) |
363 | return ret; | |
364 | ||
365 | break; | |
366 | } | |
367 | return ret; | |
368 | } | |
369 | ||
7b8002a1 PNA |
370 | static int cttimeout_default_set(struct net *net, struct sock *ctnl, |
371 | struct sk_buff *skb, | |
372 | const struct nlmsghdr *nlh, | |
373 | const struct nlattr * const cda[]) | |
91cb498e PNA |
374 | { |
375 | __u16 l3num; | |
376 | __u8 l4num; | |
377 | struct nf_conntrack_l4proto *l4proto; | |
91cb498e PNA |
378 | unsigned int *timeouts; |
379 | int ret; | |
380 | ||
381 | if (!cda[CTA_TIMEOUT_L3PROTO] || | |
382 | !cda[CTA_TIMEOUT_L4PROTO] || | |
383 | !cda[CTA_TIMEOUT_DATA]) | |
384 | return -EINVAL; | |
385 | ||
386 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); | |
387 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); | |
388 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); | |
389 | ||
390 | /* This protocol is not supported, skip. */ | |
391 | if (l4proto->l4proto != l4num) { | |
392 | ret = -EOPNOTSUPP; | |
393 | goto err; | |
394 | } | |
395 | ||
396 | timeouts = l4proto->get_timeouts(net); | |
397 | ||
398 | ret = ctnl_timeout_parse_policy(timeouts, l4proto, net, | |
399 | cda[CTA_TIMEOUT_DATA]); | |
400 | if (ret < 0) | |
401 | goto err; | |
402 | ||
403 | nf_ct_l4proto_put(l4proto); | |
404 | return 0; | |
405 | err: | |
406 | nf_ct_l4proto_put(l4proto); | |
407 | return ret; | |
408 | } | |
409 | ||
410 | static int | |
411 | cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid, | |
412 | u32 seq, u32 type, int event, | |
413 | struct nf_conntrack_l4proto *l4proto) | |
414 | { | |
415 | struct nlmsghdr *nlh; | |
416 | struct nfgenmsg *nfmsg; | |
417 | unsigned int flags = portid ? NLM_F_MULTI : 0; | |
418 | ||
419 | event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; | |
420 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); | |
421 | if (nlh == NULL) | |
422 | goto nlmsg_failure; | |
423 | ||
424 | nfmsg = nlmsg_data(nlh); | |
425 | nfmsg->nfgen_family = AF_UNSPEC; | |
426 | nfmsg->version = NFNETLINK_V0; | |
427 | nfmsg->res_id = 0; | |
428 | ||
429 | if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l4proto->l3proto)) || | |
430 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto)) | |
431 | goto nla_put_failure; | |
432 | ||
433 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { | |
434 | struct nlattr *nest_parms; | |
435 | unsigned int *timeouts = l4proto->get_timeouts(net); | |
436 | int ret; | |
437 | ||
438 | nest_parms = nla_nest_start(skb, | |
439 | CTA_TIMEOUT_DATA | NLA_F_NESTED); | |
440 | if (!nest_parms) | |
441 | goto nla_put_failure; | |
442 | ||
443 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts); | |
444 | if (ret < 0) | |
445 | goto nla_put_failure; | |
446 | ||
447 | nla_nest_end(skb, nest_parms); | |
448 | } | |
449 | ||
450 | nlmsg_end(skb, nlh); | |
451 | return skb->len; | |
452 | ||
453 | nlmsg_failure: | |
454 | nla_put_failure: | |
455 | nlmsg_cancel(skb, nlh); | |
456 | return -1; | |
457 | } | |
458 | ||
7b8002a1 PNA |
459 | static int cttimeout_default_get(struct net *net, struct sock *ctnl, |
460 | struct sk_buff *skb, | |
91cb498e PNA |
461 | const struct nlmsghdr *nlh, |
462 | const struct nlattr * const cda[]) | |
463 | { | |
464 | __u16 l3num; | |
465 | __u8 l4num; | |
466 | struct nf_conntrack_l4proto *l4proto; | |
91cb498e PNA |
467 | struct sk_buff *skb2; |
468 | int ret, err; | |
469 | ||
470 | if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO]) | |
471 | return -EINVAL; | |
472 | ||
473 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); | |
474 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); | |
475 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); | |
476 | ||
477 | /* This protocol is not supported, skip. */ | |
478 | if (l4proto->l4proto != l4num) { | |
479 | err = -EOPNOTSUPP; | |
480 | goto err; | |
481 | } | |
482 | ||
483 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
484 | if (skb2 == NULL) { | |
485 | err = -ENOMEM; | |
486 | goto err; | |
487 | } | |
488 | ||
489 | ret = cttimeout_default_fill_info(net, skb2, NETLINK_CB(skb).portid, | |
490 | nlh->nlmsg_seq, | |
491 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
492 | IPCTNL_MSG_TIMEOUT_DEFAULT_SET, | |
493 | l4proto); | |
494 | if (ret <= 0) { | |
495 | kfree_skb(skb2); | |
496 | err = -ENOMEM; | |
497 | goto err; | |
498 | } | |
499 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); | |
500 | if (ret > 0) | |
501 | ret = 0; | |
502 | ||
503 | /* this avoids a loop in nfnetlink. */ | |
504 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
505 | err: | |
506 | nf_ct_l4proto_put(l4proto); | |
507 | return err; | |
508 | } | |
509 | ||
24de58f4 | 510 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
19576c94 PN |
511 | static struct ctnl_timeout * |
512 | ctnl_timeout_find_get(struct net *net, const char *name) | |
24de58f4 PNA |
513 | { |
514 | struct ctnl_timeout *timeout, *matching = NULL; | |
515 | ||
516 | rcu_read_lock(); | |
19576c94 | 517 | list_for_each_entry_rcu(timeout, &net->nfct_timeout_list, head) { |
24de58f4 PNA |
518 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
519 | continue; | |
520 | ||
521 | if (!try_module_get(THIS_MODULE)) | |
522 | goto err; | |
523 | ||
524 | if (!atomic_inc_not_zero(&timeout->refcnt)) { | |
525 | module_put(THIS_MODULE); | |
526 | goto err; | |
527 | } | |
528 | matching = timeout; | |
529 | break; | |
530 | } | |
531 | err: | |
532 | rcu_read_unlock(); | |
533 | return matching; | |
534 | } | |
535 | ||
536 | static void ctnl_timeout_put(struct ctnl_timeout *timeout) | |
537 | { | |
538 | atomic_dec(&timeout->refcnt); | |
539 | module_put(THIS_MODULE); | |
540 | } | |
541 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ | |
542 | ||
50978462 PNA |
543 | static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = { |
544 | [IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout, | |
545 | .attr_count = CTA_TIMEOUT_MAX, | |
546 | .policy = cttimeout_nla_policy }, | |
547 | [IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout, | |
548 | .attr_count = CTA_TIMEOUT_MAX, | |
549 | .policy = cttimeout_nla_policy }, | |
550 | [IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout, | |
551 | .attr_count = CTA_TIMEOUT_MAX, | |
552 | .policy = cttimeout_nla_policy }, | |
91cb498e PNA |
553 | [IPCTNL_MSG_TIMEOUT_DEFAULT_SET]= { .call = cttimeout_default_set, |
554 | .attr_count = CTA_TIMEOUT_MAX, | |
555 | .policy = cttimeout_nla_policy }, | |
556 | [IPCTNL_MSG_TIMEOUT_DEFAULT_GET]= { .call = cttimeout_default_get, | |
557 | .attr_count = CTA_TIMEOUT_MAX, | |
558 | .policy = cttimeout_nla_policy }, | |
50978462 PNA |
559 | }; |
560 | ||
561 | static const struct nfnetlink_subsystem cttimeout_subsys = { | |
562 | .name = "conntrack_timeout", | |
563 | .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT, | |
564 | .cb_count = IPCTNL_MSG_TIMEOUT_MAX, | |
565 | .cb = cttimeout_cb, | |
566 | }; | |
567 | ||
568 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT); | |
569 | ||
19576c94 PN |
570 | static int __net_init cttimeout_net_init(struct net *net) |
571 | { | |
572 | INIT_LIST_HEAD(&net->nfct_timeout_list); | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | static void __net_exit cttimeout_net_exit(struct net *net) | |
578 | { | |
579 | struct ctnl_timeout *cur, *tmp; | |
580 | ||
581 | ctnl_untimeout(net, NULL); | |
582 | ||
583 | list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, head) { | |
584 | list_del_rcu(&cur->head); | |
585 | nf_ct_l4proto_put(cur->l4proto); | |
586 | kfree_rcu(cur, rcu_head); | |
587 | } | |
588 | } | |
589 | ||
590 | static struct pernet_operations cttimeout_ops = { | |
591 | .init = cttimeout_net_init, | |
592 | .exit = cttimeout_net_exit, | |
593 | }; | |
594 | ||
50978462 PNA |
595 | static int __init cttimeout_init(void) |
596 | { | |
597 | int ret; | |
598 | ||
19576c94 PN |
599 | ret = register_pernet_subsys(&cttimeout_ops); |
600 | if (ret < 0) | |
601 | return ret; | |
602 | ||
50978462 PNA |
603 | ret = nfnetlink_subsys_register(&cttimeout_subsys); |
604 | if (ret < 0) { | |
605 | pr_err("cttimeout_init: cannot register cttimeout with " | |
606 | "nfnetlink.\n"); | |
607 | goto err_out; | |
608 | } | |
24de58f4 PNA |
609 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
610 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get); | |
611 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put); | |
612 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ | |
50978462 PNA |
613 | return 0; |
614 | ||
615 | err_out: | |
19576c94 | 616 | unregister_pernet_subsys(&cttimeout_ops); |
50978462 PNA |
617 | return ret; |
618 | } | |
619 | ||
620 | static void __exit cttimeout_exit(void) | |
621 | { | |
50978462 PNA |
622 | pr_info("cttimeout: unregistering from nfnetlink.\n"); |
623 | ||
624 | nfnetlink_subsys_unregister(&cttimeout_subsys); | |
ae2d708e | 625 | |
19576c94 | 626 | unregister_pernet_subsys(&cttimeout_ops); |
24de58f4 PNA |
627 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
628 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL); | |
629 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL); | |
630 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ | |
4302f5ee | 631 | rcu_barrier(); |
50978462 PNA |
632 | } |
633 | ||
634 | module_init(cttimeout_init); | |
635 | module_exit(cttimeout_exit); |