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Commit | Line | Data |
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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 | ||
50978462 PNA |
101 | if (matching) { |
102 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { | |
103 | /* You cannot replace one timeout policy by another of | |
104 | * different kind, sorry. | |
105 | */ | |
106 | if (matching->l3num != l3num || | |
23aaba5a LZ |
107 | matching->l4proto->l4proto != l4num) |
108 | return -EINVAL; | |
109 | ||
110 | return ctnl_timeout_parse_policy(&matching->data, | |
111 | matching->l4proto, net, | |
112 | cda[CTA_TIMEOUT_DATA]); | |
50978462 | 113 | } |
23aaba5a LZ |
114 | |
115 | return -EBUSY; | |
116 | } | |
117 | ||
118 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); | |
119 | ||
120 | /* This protocol is not supportted, skip. */ | |
121 | if (l4proto->l4proto != l4num) { | |
122 | ret = -EOPNOTSUPP; | |
c1ebd7df | 123 | goto err_proto_put; |
50978462 PNA |
124 | } |
125 | ||
126 | timeout = kzalloc(sizeof(struct ctnl_timeout) + | |
127 | l4proto->ctnl_timeout.obj_size, GFP_KERNEL); | |
c1ebd7df PNA |
128 | if (timeout == NULL) { |
129 | ret = -ENOMEM; | |
130 | goto err_proto_put; | |
131 | } | |
50978462 | 132 | |
91cb498e | 133 | ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net, |
50978462 PNA |
134 | cda[CTA_TIMEOUT_DATA]); |
135 | if (ret < 0) | |
136 | goto err; | |
137 | ||
138 | strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME])); | |
139 | timeout->l3num = l3num; | |
c1ebd7df | 140 | timeout->l4proto = l4proto; |
50978462 | 141 | atomic_set(&timeout->refcnt, 1); |
19576c94 | 142 | list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list); |
50978462 PNA |
143 | |
144 | return 0; | |
145 | err: | |
146 | kfree(timeout); | |
c1ebd7df PNA |
147 | err_proto_put: |
148 | nf_ct_l4proto_put(l4proto); | |
50978462 PNA |
149 | return ret; |
150 | } | |
151 | ||
152 | static int | |
15e47304 | 153 | ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
50978462 PNA |
154 | int event, struct ctnl_timeout *timeout) |
155 | { | |
156 | struct nlmsghdr *nlh; | |
157 | struct nfgenmsg *nfmsg; | |
15e47304 | 158 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
c1ebd7df | 159 | struct nf_conntrack_l4proto *l4proto = timeout->l4proto; |
50978462 PNA |
160 | |
161 | event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; | |
15e47304 | 162 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
50978462 PNA |
163 | if (nlh == NULL) |
164 | goto nlmsg_failure; | |
165 | ||
166 | nfmsg = nlmsg_data(nlh); | |
167 | nfmsg->nfgen_family = AF_UNSPEC; | |
168 | nfmsg->version = NFNETLINK_V0; | |
169 | nfmsg->res_id = 0; | |
170 | ||
48f03bda DM |
171 | if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) || |
172 | nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) || | |
173 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) || | |
174 | nla_put_be32(skb, CTA_TIMEOUT_USE, | |
175 | htonl(atomic_read(&timeout->refcnt)))) | |
176 | goto nla_put_failure; | |
50978462 | 177 | |
50978462 PNA |
178 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { |
179 | struct nlattr *nest_parms; | |
180 | int ret; | |
181 | ||
182 | nest_parms = nla_nest_start(skb, | |
183 | CTA_TIMEOUT_DATA | NLA_F_NESTED); | |
184 | if (!nest_parms) | |
185 | goto nla_put_failure; | |
186 | ||
187 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data); | |
188 | if (ret < 0) | |
189 | goto nla_put_failure; | |
190 | ||
191 | nla_nest_end(skb, nest_parms); | |
192 | } | |
c1ebd7df | 193 | |
50978462 PNA |
194 | nlmsg_end(skb, nlh); |
195 | return skb->len; | |
196 | ||
197 | nlmsg_failure: | |
198 | nla_put_failure: | |
199 | nlmsg_cancel(skb, nlh); | |
200 | return -1; | |
201 | } | |
202 | ||
203 | static int | |
204 | ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
205 | { | |
19576c94 | 206 | struct net *net = sock_net(skb->sk); |
50978462 PNA |
207 | struct ctnl_timeout *cur, *last; |
208 | ||
209 | if (cb->args[2]) | |
210 | return 0; | |
211 | ||
212 | last = (struct ctnl_timeout *)cb->args[1]; | |
213 | if (cb->args[1]) | |
214 | cb->args[1] = 0; | |
215 | ||
216 | rcu_read_lock(); | |
19576c94 | 217 | list_for_each_entry_rcu(cur, &net->nfct_timeout_list, head) { |
37bc4f8d PNA |
218 | if (last) { |
219 | if (cur != last) | |
220 | continue; | |
50978462 | 221 | |
37bc4f8d PNA |
222 | last = NULL; |
223 | } | |
15e47304 | 224 | if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid, |
50978462 PNA |
225 | cb->nlh->nlmsg_seq, |
226 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), | |
227 | IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) { | |
228 | cb->args[1] = (unsigned long)cur; | |
229 | break; | |
230 | } | |
231 | } | |
232 | if (!cb->args[1]) | |
233 | cb->args[2] = 1; | |
234 | rcu_read_unlock(); | |
235 | return skb->len; | |
236 | } | |
237 | ||
7b8002a1 PNA |
238 | static int cttimeout_get_timeout(struct net *net, struct sock *ctnl, |
239 | struct sk_buff *skb, | |
240 | const struct nlmsghdr *nlh, | |
241 | const struct nlattr * const cda[]) | |
50978462 PNA |
242 | { |
243 | int ret = -ENOENT; | |
244 | char *name; | |
245 | struct ctnl_timeout *cur; | |
246 | ||
247 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
248 | struct netlink_dump_control c = { | |
249 | .dump = ctnl_timeout_dump, | |
250 | }; | |
251 | return netlink_dump_start(ctnl, skb, nlh, &c); | |
252 | } | |
253 | ||
254 | if (!cda[CTA_TIMEOUT_NAME]) | |
255 | return -EINVAL; | |
256 | name = nla_data(cda[CTA_TIMEOUT_NAME]); | |
257 | ||
19576c94 | 258 | list_for_each_entry(cur, &net->nfct_timeout_list, head) { |
50978462 PNA |
259 | struct sk_buff *skb2; |
260 | ||
261 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) | |
262 | continue; | |
263 | ||
264 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
265 | if (skb2 == NULL) { | |
266 | ret = -ENOMEM; | |
267 | break; | |
268 | } | |
269 | ||
15e47304 | 270 | ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid, |
50978462 PNA |
271 | nlh->nlmsg_seq, |
272 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
273 | IPCTNL_MSG_TIMEOUT_NEW, cur); | |
274 | if (ret <= 0) { | |
275 | kfree_skb(skb2); | |
276 | break; | |
277 | } | |
15e47304 | 278 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, |
50978462 PNA |
279 | MSG_DONTWAIT); |
280 | if (ret > 0) | |
281 | ret = 0; | |
282 | ||
283 | /* this avoids a loop in nfnetlink. */ | |
284 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
285 | } | |
286 | return ret; | |
287 | } | |
288 | ||
ae2d708e PNA |
289 | static void untimeout(struct nf_conntrack_tuple_hash *i, |
290 | struct ctnl_timeout *timeout) | |
291 | { | |
292 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(i); | |
293 | struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct); | |
294 | ||
295 | if (timeout_ext && (!timeout || timeout_ext->timeout == timeout)) | |
296 | RCU_INIT_POINTER(timeout_ext->timeout, NULL); | |
297 | } | |
298 | ||
19576c94 | 299 | static void ctnl_untimeout(struct net *net, struct ctnl_timeout *timeout) |
ae2d708e PNA |
300 | { |
301 | struct nf_conntrack_tuple_hash *h; | |
302 | const struct hlist_nulls_node *nn; | |
474803d3 LZ |
303 | unsigned int last_hsize; |
304 | spinlock_t *lock; | |
533e3300 LZ |
305 | int i, cpu; |
306 | ||
307 | for_each_possible_cpu(cpu) { | |
308 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); | |
309 | ||
310 | spin_lock_bh(&pcpu->lock); | |
311 | hlist_nulls_for_each_entry(h, nn, &pcpu->unconfirmed, hnnode) | |
312 | untimeout(h, timeout); | |
313 | spin_unlock_bh(&pcpu->lock); | |
314 | } | |
ae2d708e PNA |
315 | |
316 | local_bh_disable(); | |
474803d3 LZ |
317 | restart: |
318 | last_hsize = nf_conntrack_htable_size; | |
319 | for (i = 0; i < last_hsize; i++) { | |
320 | lock = &nf_conntrack_locks[i % CONNTRACK_LOCKS]; | |
321 | nf_conntrack_lock(lock); | |
322 | if (last_hsize != nf_conntrack_htable_size) { | |
323 | spin_unlock(lock); | |
324 | goto restart; | |
ae2d708e | 325 | } |
474803d3 LZ |
326 | |
327 | hlist_nulls_for_each_entry(h, nn, &nf_conntrack_hash[i], hnnode) | |
328 | untimeout(h, timeout); | |
329 | spin_unlock(lock); | |
ae2d708e PNA |
330 | } |
331 | local_bh_enable(); | |
332 | } | |
333 | ||
50978462 | 334 | /* try to delete object, fail if it is still in use. */ |
19576c94 | 335 | static int ctnl_timeout_try_del(struct net *net, struct ctnl_timeout *timeout) |
50978462 PNA |
336 | { |
337 | int ret = 0; | |
338 | ||
b75911b6 LZ |
339 | /* We want to avoid races with ctnl_timeout_put. So only when the |
340 | * current refcnt is 1, we decrease it to 0. | |
341 | */ | |
342 | if (atomic_cmpxchg(&timeout->refcnt, 1, 0) == 1) { | |
50978462 PNA |
343 | /* We are protected by nfnl mutex. */ |
344 | list_del_rcu(&timeout->head); | |
c1ebd7df | 345 | nf_ct_l4proto_put(timeout->l4proto); |
19576c94 | 346 | ctnl_untimeout(net, timeout); |
50978462 PNA |
347 | kfree_rcu(timeout, rcu_head); |
348 | } else { | |
50978462 PNA |
349 | ret = -EBUSY; |
350 | } | |
351 | return ret; | |
352 | } | |
353 | ||
7b8002a1 PNA |
354 | static int cttimeout_del_timeout(struct net *net, struct sock *ctnl, |
355 | struct sk_buff *skb, | |
356 | const struct nlmsghdr *nlh, | |
357 | const struct nlattr * const cda[]) | |
50978462 | 358 | { |
93fac10b | 359 | struct ctnl_timeout *cur, *tmp; |
50978462 | 360 | int ret = -ENOENT; |
7b8002a1 | 361 | char *name; |
50978462 PNA |
362 | |
363 | if (!cda[CTA_TIMEOUT_NAME]) { | |
93fac10b LZ |
364 | list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, |
365 | head) | |
19576c94 | 366 | ctnl_timeout_try_del(net, cur); |
50978462 PNA |
367 | |
368 | return 0; | |
369 | } | |
370 | name = nla_data(cda[CTA_TIMEOUT_NAME]); | |
371 | ||
19576c94 | 372 | list_for_each_entry(cur, &net->nfct_timeout_list, head) { |
50978462 PNA |
373 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
374 | continue; | |
375 | ||
19576c94 | 376 | ret = ctnl_timeout_try_del(net, cur); |
50978462 PNA |
377 | if (ret < 0) |
378 | return ret; | |
379 | ||
380 | break; | |
381 | } | |
382 | return ret; | |
383 | } | |
384 | ||
7b8002a1 PNA |
385 | static int cttimeout_default_set(struct net *net, struct sock *ctnl, |
386 | struct sk_buff *skb, | |
387 | const struct nlmsghdr *nlh, | |
388 | const struct nlattr * const cda[]) | |
91cb498e PNA |
389 | { |
390 | __u16 l3num; | |
391 | __u8 l4num; | |
392 | struct nf_conntrack_l4proto *l4proto; | |
91cb498e PNA |
393 | unsigned int *timeouts; |
394 | int ret; | |
395 | ||
396 | if (!cda[CTA_TIMEOUT_L3PROTO] || | |
397 | !cda[CTA_TIMEOUT_L4PROTO] || | |
398 | !cda[CTA_TIMEOUT_DATA]) | |
399 | return -EINVAL; | |
400 | ||
401 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); | |
402 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); | |
403 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); | |
404 | ||
405 | /* This protocol is not supported, skip. */ | |
406 | if (l4proto->l4proto != l4num) { | |
407 | ret = -EOPNOTSUPP; | |
408 | goto err; | |
409 | } | |
410 | ||
411 | timeouts = l4proto->get_timeouts(net); | |
412 | ||
413 | ret = ctnl_timeout_parse_policy(timeouts, l4proto, net, | |
414 | cda[CTA_TIMEOUT_DATA]); | |
415 | if (ret < 0) | |
416 | goto err; | |
417 | ||
418 | nf_ct_l4proto_put(l4proto); | |
419 | return 0; | |
420 | err: | |
421 | nf_ct_l4proto_put(l4proto); | |
422 | return ret; | |
423 | } | |
424 | ||
425 | static int | |
426 | cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid, | |
427 | u32 seq, u32 type, int event, | |
428 | struct nf_conntrack_l4proto *l4proto) | |
429 | { | |
430 | struct nlmsghdr *nlh; | |
431 | struct nfgenmsg *nfmsg; | |
432 | unsigned int flags = portid ? NLM_F_MULTI : 0; | |
433 | ||
434 | event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; | |
435 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); | |
436 | if (nlh == NULL) | |
437 | goto nlmsg_failure; | |
438 | ||
439 | nfmsg = nlmsg_data(nlh); | |
440 | nfmsg->nfgen_family = AF_UNSPEC; | |
441 | nfmsg->version = NFNETLINK_V0; | |
442 | nfmsg->res_id = 0; | |
443 | ||
444 | if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l4proto->l3proto)) || | |
445 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto)) | |
446 | goto nla_put_failure; | |
447 | ||
448 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { | |
449 | struct nlattr *nest_parms; | |
450 | unsigned int *timeouts = l4proto->get_timeouts(net); | |
451 | int ret; | |
452 | ||
453 | nest_parms = nla_nest_start(skb, | |
454 | CTA_TIMEOUT_DATA | NLA_F_NESTED); | |
455 | if (!nest_parms) | |
456 | goto nla_put_failure; | |
457 | ||
458 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts); | |
459 | if (ret < 0) | |
460 | goto nla_put_failure; | |
461 | ||
462 | nla_nest_end(skb, nest_parms); | |
463 | } | |
464 | ||
465 | nlmsg_end(skb, nlh); | |
466 | return skb->len; | |
467 | ||
468 | nlmsg_failure: | |
469 | nla_put_failure: | |
470 | nlmsg_cancel(skb, nlh); | |
471 | return -1; | |
472 | } | |
473 | ||
7b8002a1 PNA |
474 | static int cttimeout_default_get(struct net *net, struct sock *ctnl, |
475 | struct sk_buff *skb, | |
91cb498e PNA |
476 | const struct nlmsghdr *nlh, |
477 | const struct nlattr * const cda[]) | |
478 | { | |
479 | __u16 l3num; | |
480 | __u8 l4num; | |
481 | struct nf_conntrack_l4proto *l4proto; | |
91cb498e PNA |
482 | struct sk_buff *skb2; |
483 | int ret, err; | |
484 | ||
485 | if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO]) | |
486 | return -EINVAL; | |
487 | ||
488 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); | |
489 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); | |
490 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); | |
491 | ||
492 | /* This protocol is not supported, skip. */ | |
493 | if (l4proto->l4proto != l4num) { | |
494 | err = -EOPNOTSUPP; | |
495 | goto err; | |
496 | } | |
497 | ||
498 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
499 | if (skb2 == NULL) { | |
500 | err = -ENOMEM; | |
501 | goto err; | |
502 | } | |
503 | ||
504 | ret = cttimeout_default_fill_info(net, skb2, NETLINK_CB(skb).portid, | |
505 | nlh->nlmsg_seq, | |
506 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
507 | IPCTNL_MSG_TIMEOUT_DEFAULT_SET, | |
508 | l4proto); | |
509 | if (ret <= 0) { | |
510 | kfree_skb(skb2); | |
511 | err = -ENOMEM; | |
512 | goto err; | |
513 | } | |
514 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); | |
515 | if (ret > 0) | |
516 | ret = 0; | |
517 | ||
518 | /* this avoids a loop in nfnetlink. */ | |
519 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
520 | err: | |
521 | nf_ct_l4proto_put(l4proto); | |
522 | return err; | |
523 | } | |
524 | ||
24de58f4 | 525 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
19576c94 PN |
526 | static struct ctnl_timeout * |
527 | ctnl_timeout_find_get(struct net *net, const char *name) | |
24de58f4 PNA |
528 | { |
529 | struct ctnl_timeout *timeout, *matching = NULL; | |
530 | ||
531 | rcu_read_lock(); | |
19576c94 | 532 | list_for_each_entry_rcu(timeout, &net->nfct_timeout_list, head) { |
24de58f4 PNA |
533 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
534 | continue; | |
535 | ||
536 | if (!try_module_get(THIS_MODULE)) | |
537 | goto err; | |
538 | ||
539 | if (!atomic_inc_not_zero(&timeout->refcnt)) { | |
540 | module_put(THIS_MODULE); | |
541 | goto err; | |
542 | } | |
543 | matching = timeout; | |
544 | break; | |
545 | } | |
546 | err: | |
547 | rcu_read_unlock(); | |
548 | return matching; | |
549 | } | |
550 | ||
551 | static void ctnl_timeout_put(struct ctnl_timeout *timeout) | |
552 | { | |
b75911b6 LZ |
553 | if (atomic_dec_and_test(&timeout->refcnt)) |
554 | kfree_rcu(timeout, rcu_head); | |
555 | ||
24de58f4 PNA |
556 | module_put(THIS_MODULE); |
557 | } | |
558 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ | |
559 | ||
50978462 PNA |
560 | static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = { |
561 | [IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout, | |
562 | .attr_count = CTA_TIMEOUT_MAX, | |
563 | .policy = cttimeout_nla_policy }, | |
564 | [IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout, | |
565 | .attr_count = CTA_TIMEOUT_MAX, | |
566 | .policy = cttimeout_nla_policy }, | |
567 | [IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout, | |
568 | .attr_count = CTA_TIMEOUT_MAX, | |
569 | .policy = cttimeout_nla_policy }, | |
91cb498e PNA |
570 | [IPCTNL_MSG_TIMEOUT_DEFAULT_SET]= { .call = cttimeout_default_set, |
571 | .attr_count = CTA_TIMEOUT_MAX, | |
572 | .policy = cttimeout_nla_policy }, | |
573 | [IPCTNL_MSG_TIMEOUT_DEFAULT_GET]= { .call = cttimeout_default_get, | |
574 | .attr_count = CTA_TIMEOUT_MAX, | |
575 | .policy = cttimeout_nla_policy }, | |
50978462 PNA |
576 | }; |
577 | ||
578 | static const struct nfnetlink_subsystem cttimeout_subsys = { | |
579 | .name = "conntrack_timeout", | |
580 | .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT, | |
581 | .cb_count = IPCTNL_MSG_TIMEOUT_MAX, | |
582 | .cb = cttimeout_cb, | |
583 | }; | |
584 | ||
585 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT); | |
586 | ||
19576c94 PN |
587 | static int __net_init cttimeout_net_init(struct net *net) |
588 | { | |
589 | INIT_LIST_HEAD(&net->nfct_timeout_list); | |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | static void __net_exit cttimeout_net_exit(struct net *net) | |
595 | { | |
596 | struct ctnl_timeout *cur, *tmp; | |
597 | ||
598 | ctnl_untimeout(net, NULL); | |
599 | ||
600 | list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, head) { | |
601 | list_del_rcu(&cur->head); | |
602 | nf_ct_l4proto_put(cur->l4proto); | |
b75911b6 LZ |
603 | |
604 | if (atomic_dec_and_test(&cur->refcnt)) | |
605 | kfree_rcu(cur, rcu_head); | |
19576c94 PN |
606 | } |
607 | } | |
608 | ||
609 | static struct pernet_operations cttimeout_ops = { | |
610 | .init = cttimeout_net_init, | |
611 | .exit = cttimeout_net_exit, | |
612 | }; | |
613 | ||
50978462 PNA |
614 | static int __init cttimeout_init(void) |
615 | { | |
616 | int ret; | |
617 | ||
19576c94 PN |
618 | ret = register_pernet_subsys(&cttimeout_ops); |
619 | if (ret < 0) | |
620 | return ret; | |
621 | ||
50978462 PNA |
622 | ret = nfnetlink_subsys_register(&cttimeout_subsys); |
623 | if (ret < 0) { | |
624 | pr_err("cttimeout_init: cannot register cttimeout with " | |
625 | "nfnetlink.\n"); | |
626 | goto err_out; | |
627 | } | |
24de58f4 PNA |
628 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
629 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get); | |
630 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put); | |
631 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ | |
50978462 PNA |
632 | return 0; |
633 | ||
634 | err_out: | |
19576c94 | 635 | unregister_pernet_subsys(&cttimeout_ops); |
50978462 PNA |
636 | return ret; |
637 | } | |
638 | ||
639 | static void __exit cttimeout_exit(void) | |
640 | { | |
50978462 PNA |
641 | pr_info("cttimeout: unregistering from nfnetlink.\n"); |
642 | ||
643 | nfnetlink_subsys_unregister(&cttimeout_subsys); | |
ae2d708e | 644 | |
19576c94 | 645 | unregister_pernet_subsys(&cttimeout_ops); |
24de58f4 PNA |
646 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
647 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL); | |
648 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL); | |
3b7dabf0 | 649 | synchronize_rcu(); |
24de58f4 | 650 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
50978462 PNA |
651 | } |
652 | ||
653 | module_init(cttimeout_init); | |
654 | module_exit(cttimeout_exit); |