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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 | 58 | ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max, |
fceb6435 JB |
59 | attr, l4proto->ctnl_timeout.nla_policy, |
60 | NULL); | |
130ffbc2 DB |
61 | if (ret < 0) |
62 | return ret; | |
50978462 | 63 | |
91cb498e | 64 | ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts); |
50978462 PNA |
65 | } |
66 | return ret; | |
67 | } | |
68 | ||
7b8002a1 PNA |
69 | static int cttimeout_new_timeout(struct net *net, struct sock *ctnl, |
70 | struct sk_buff *skb, | |
71 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
72 | const struct nlattr * const cda[], |
73 | struct netlink_ext_ack *extack) | |
50978462 PNA |
74 | { |
75 | __u16 l3num; | |
76 | __u8 l4num; | |
77 | struct nf_conntrack_l4proto *l4proto; | |
78 | struct ctnl_timeout *timeout, *matching = NULL; | |
79 | char *name; | |
80 | int ret; | |
81 | ||
82 | if (!cda[CTA_TIMEOUT_NAME] || | |
83 | !cda[CTA_TIMEOUT_L3PROTO] || | |
84 | !cda[CTA_TIMEOUT_L4PROTO] || | |
85 | !cda[CTA_TIMEOUT_DATA]) | |
86 | return -EINVAL; | |
87 | ||
88 | name = nla_data(cda[CTA_TIMEOUT_NAME]); | |
89 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); | |
90 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); | |
91 | ||
19576c94 | 92 | list_for_each_entry(timeout, &net->nfct_timeout_list, head) { |
50978462 PNA |
93 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
94 | continue; | |
95 | ||
96 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
97 | return -EEXIST; | |
98 | ||
99 | matching = timeout; | |
100 | break; | |
101 | } | |
102 | ||
50978462 PNA |
103 | if (matching) { |
104 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { | |
105 | /* You cannot replace one timeout policy by another of | |
106 | * different kind, sorry. | |
107 | */ | |
108 | if (matching->l3num != l3num || | |
23aaba5a LZ |
109 | matching->l4proto->l4proto != l4num) |
110 | return -EINVAL; | |
111 | ||
112 | return ctnl_timeout_parse_policy(&matching->data, | |
113 | matching->l4proto, net, | |
114 | cda[CTA_TIMEOUT_DATA]); | |
50978462 | 115 | } |
23aaba5a LZ |
116 | |
117 | return -EBUSY; | |
118 | } | |
119 | ||
120 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); | |
121 | ||
122 | /* This protocol is not supportted, skip. */ | |
123 | if (l4proto->l4proto != l4num) { | |
124 | ret = -EOPNOTSUPP; | |
c1ebd7df | 125 | goto err_proto_put; |
50978462 PNA |
126 | } |
127 | ||
128 | timeout = kzalloc(sizeof(struct ctnl_timeout) + | |
129 | l4proto->ctnl_timeout.obj_size, GFP_KERNEL); | |
c1ebd7df PNA |
130 | if (timeout == NULL) { |
131 | ret = -ENOMEM; | |
132 | goto err_proto_put; | |
133 | } | |
50978462 | 134 | |
91cb498e | 135 | ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net, |
50978462 PNA |
136 | cda[CTA_TIMEOUT_DATA]); |
137 | if (ret < 0) | |
138 | goto err; | |
139 | ||
140 | strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME])); | |
141 | timeout->l3num = l3num; | |
c1ebd7df | 142 | timeout->l4proto = l4proto; |
b54ab92b | 143 | refcount_set(&timeout->refcnt, 1); |
19576c94 | 144 | list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list); |
50978462 PNA |
145 | |
146 | return 0; | |
147 | err: | |
148 | kfree(timeout); | |
c1ebd7df PNA |
149 | err_proto_put: |
150 | nf_ct_l4proto_put(l4proto); | |
50978462 PNA |
151 | return ret; |
152 | } | |
153 | ||
154 | static int | |
15e47304 | 155 | ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
50978462 PNA |
156 | int event, struct ctnl_timeout *timeout) |
157 | { | |
158 | struct nlmsghdr *nlh; | |
159 | struct nfgenmsg *nfmsg; | |
15e47304 | 160 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
c1ebd7df | 161 | struct nf_conntrack_l4proto *l4proto = timeout->l4proto; |
50978462 | 162 | |
dedb67c4 | 163 | event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event); |
15e47304 | 164 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
50978462 PNA |
165 | if (nlh == NULL) |
166 | goto nlmsg_failure; | |
167 | ||
168 | nfmsg = nlmsg_data(nlh); | |
169 | nfmsg->nfgen_family = AF_UNSPEC; | |
170 | nfmsg->version = NFNETLINK_V0; | |
171 | nfmsg->res_id = 0; | |
172 | ||
48f03bda DM |
173 | if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) || |
174 | nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) || | |
175 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) || | |
176 | nla_put_be32(skb, CTA_TIMEOUT_USE, | |
b54ab92b | 177 | htonl(refcount_read(&timeout->refcnt)))) |
48f03bda | 178 | goto nla_put_failure; |
50978462 | 179 | |
50978462 PNA |
180 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { |
181 | struct nlattr *nest_parms; | |
182 | int ret; | |
183 | ||
184 | nest_parms = nla_nest_start(skb, | |
185 | CTA_TIMEOUT_DATA | NLA_F_NESTED); | |
186 | if (!nest_parms) | |
187 | goto nla_put_failure; | |
188 | ||
189 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data); | |
190 | if (ret < 0) | |
191 | goto nla_put_failure; | |
192 | ||
193 | nla_nest_end(skb, nest_parms); | |
194 | } | |
c1ebd7df | 195 | |
50978462 PNA |
196 | nlmsg_end(skb, nlh); |
197 | return skb->len; | |
198 | ||
199 | nlmsg_failure: | |
200 | nla_put_failure: | |
201 | nlmsg_cancel(skb, nlh); | |
202 | return -1; | |
203 | } | |
204 | ||
205 | static int | |
206 | ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
207 | { | |
19576c94 | 208 | struct net *net = sock_net(skb->sk); |
50978462 PNA |
209 | struct ctnl_timeout *cur, *last; |
210 | ||
211 | if (cb->args[2]) | |
212 | return 0; | |
213 | ||
214 | last = (struct ctnl_timeout *)cb->args[1]; | |
215 | if (cb->args[1]) | |
216 | cb->args[1] = 0; | |
217 | ||
218 | rcu_read_lock(); | |
19576c94 | 219 | list_for_each_entry_rcu(cur, &net->nfct_timeout_list, head) { |
37bc4f8d PNA |
220 | if (last) { |
221 | if (cur != last) | |
222 | continue; | |
50978462 | 223 | |
37bc4f8d PNA |
224 | last = NULL; |
225 | } | |
15e47304 | 226 | if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid, |
50978462 PNA |
227 | cb->nlh->nlmsg_seq, |
228 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), | |
229 | IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) { | |
230 | cb->args[1] = (unsigned long)cur; | |
231 | break; | |
232 | } | |
233 | } | |
234 | if (!cb->args[1]) | |
235 | cb->args[2] = 1; | |
236 | rcu_read_unlock(); | |
237 | return skb->len; | |
238 | } | |
239 | ||
7b8002a1 PNA |
240 | static int cttimeout_get_timeout(struct net *net, struct sock *ctnl, |
241 | struct sk_buff *skb, | |
242 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
243 | const struct nlattr * const cda[], |
244 | struct netlink_ext_ack *extack) | |
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 | ||
34158151 | 292 | static int untimeout(struct nf_conn *ct, void *timeout) |
ae2d708e | 293 | { |
ae2d708e PNA |
294 | struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct); |
295 | ||
296 | if (timeout_ext && (!timeout || timeout_ext->timeout == timeout)) | |
297 | RCU_INIT_POINTER(timeout_ext->timeout, NULL); | |
34158151 LZ |
298 | |
299 | /* We are not intended to delete this conntrack. */ | |
300 | return 0; | |
ae2d708e PNA |
301 | } |
302 | ||
19576c94 | 303 | static void ctnl_untimeout(struct net *net, struct ctnl_timeout *timeout) |
ae2d708e | 304 | { |
34158151 | 305 | nf_ct_iterate_cleanup_net(net, untimeout, timeout, 0, 0); |
ae2d708e PNA |
306 | } |
307 | ||
50978462 | 308 | /* try to delete object, fail if it is still in use. */ |
19576c94 | 309 | static int ctnl_timeout_try_del(struct net *net, struct ctnl_timeout *timeout) |
50978462 PNA |
310 | { |
311 | int ret = 0; | |
312 | ||
b75911b6 LZ |
313 | /* We want to avoid races with ctnl_timeout_put. So only when the |
314 | * current refcnt is 1, we decrease it to 0. | |
315 | */ | |
b54ab92b | 316 | if (refcount_dec_if_one(&timeout->refcnt)) { |
50978462 PNA |
317 | /* We are protected by nfnl mutex. */ |
318 | list_del_rcu(&timeout->head); | |
c1ebd7df | 319 | nf_ct_l4proto_put(timeout->l4proto); |
19576c94 | 320 | ctnl_untimeout(net, timeout); |
50978462 PNA |
321 | kfree_rcu(timeout, rcu_head); |
322 | } else { | |
50978462 PNA |
323 | ret = -EBUSY; |
324 | } | |
325 | return ret; | |
326 | } | |
327 | ||
7b8002a1 PNA |
328 | static int cttimeout_del_timeout(struct net *net, struct sock *ctnl, |
329 | struct sk_buff *skb, | |
330 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
331 | const struct nlattr * const cda[], |
332 | struct netlink_ext_ack *extack) | |
50978462 | 333 | { |
93fac10b | 334 | struct ctnl_timeout *cur, *tmp; |
50978462 | 335 | int ret = -ENOENT; |
7b8002a1 | 336 | char *name; |
50978462 PNA |
337 | |
338 | if (!cda[CTA_TIMEOUT_NAME]) { | |
93fac10b LZ |
339 | list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, |
340 | head) | |
19576c94 | 341 | ctnl_timeout_try_del(net, cur); |
50978462 PNA |
342 | |
343 | return 0; | |
344 | } | |
345 | name = nla_data(cda[CTA_TIMEOUT_NAME]); | |
346 | ||
19576c94 | 347 | list_for_each_entry(cur, &net->nfct_timeout_list, head) { |
50978462 PNA |
348 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
349 | continue; | |
350 | ||
19576c94 | 351 | ret = ctnl_timeout_try_del(net, cur); |
50978462 PNA |
352 | if (ret < 0) |
353 | return ret; | |
354 | ||
355 | break; | |
356 | } | |
357 | return ret; | |
358 | } | |
359 | ||
7b8002a1 PNA |
360 | static int cttimeout_default_set(struct net *net, struct sock *ctnl, |
361 | struct sk_buff *skb, | |
362 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
363 | const struct nlattr * const cda[], |
364 | struct netlink_ext_ack *extack) | |
91cb498e PNA |
365 | { |
366 | __u16 l3num; | |
367 | __u8 l4num; | |
368 | struct nf_conntrack_l4proto *l4proto; | |
91cb498e PNA |
369 | unsigned int *timeouts; |
370 | int ret; | |
371 | ||
372 | if (!cda[CTA_TIMEOUT_L3PROTO] || | |
373 | !cda[CTA_TIMEOUT_L4PROTO] || | |
374 | !cda[CTA_TIMEOUT_DATA]) | |
375 | return -EINVAL; | |
376 | ||
377 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); | |
378 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); | |
379 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); | |
380 | ||
381 | /* This protocol is not supported, skip. */ | |
382 | if (l4proto->l4proto != l4num) { | |
383 | ret = -EOPNOTSUPP; | |
384 | goto err; | |
385 | } | |
386 | ||
387 | timeouts = l4proto->get_timeouts(net); | |
388 | ||
389 | ret = ctnl_timeout_parse_policy(timeouts, l4proto, net, | |
390 | cda[CTA_TIMEOUT_DATA]); | |
391 | if (ret < 0) | |
392 | goto err; | |
393 | ||
394 | nf_ct_l4proto_put(l4proto); | |
395 | return 0; | |
396 | err: | |
397 | nf_ct_l4proto_put(l4proto); | |
398 | return ret; | |
399 | } | |
400 | ||
401 | static int | |
402 | cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid, | |
403 | u32 seq, u32 type, int event, | |
404 | struct nf_conntrack_l4proto *l4proto) | |
405 | { | |
406 | struct nlmsghdr *nlh; | |
407 | struct nfgenmsg *nfmsg; | |
408 | unsigned int flags = portid ? NLM_F_MULTI : 0; | |
409 | ||
dedb67c4 | 410 | event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event); |
91cb498e PNA |
411 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
412 | if (nlh == NULL) | |
413 | goto nlmsg_failure; | |
414 | ||
415 | nfmsg = nlmsg_data(nlh); | |
416 | nfmsg->nfgen_family = AF_UNSPEC; | |
417 | nfmsg->version = NFNETLINK_V0; | |
418 | nfmsg->res_id = 0; | |
419 | ||
420 | if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l4proto->l3proto)) || | |
421 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto)) | |
422 | goto nla_put_failure; | |
423 | ||
424 | if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { | |
425 | struct nlattr *nest_parms; | |
426 | unsigned int *timeouts = l4proto->get_timeouts(net); | |
427 | int ret; | |
428 | ||
429 | nest_parms = nla_nest_start(skb, | |
430 | CTA_TIMEOUT_DATA | NLA_F_NESTED); | |
431 | if (!nest_parms) | |
432 | goto nla_put_failure; | |
433 | ||
434 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts); | |
435 | if (ret < 0) | |
436 | goto nla_put_failure; | |
437 | ||
438 | nla_nest_end(skb, nest_parms); | |
439 | } | |
440 | ||
441 | nlmsg_end(skb, nlh); | |
442 | return skb->len; | |
443 | ||
444 | nlmsg_failure: | |
445 | nla_put_failure: | |
446 | nlmsg_cancel(skb, nlh); | |
447 | return -1; | |
448 | } | |
449 | ||
7b8002a1 PNA |
450 | static int cttimeout_default_get(struct net *net, struct sock *ctnl, |
451 | struct sk_buff *skb, | |
91cb498e | 452 | const struct nlmsghdr *nlh, |
04ba724b PNA |
453 | const struct nlattr * const cda[], |
454 | struct netlink_ext_ack *extack) | |
91cb498e PNA |
455 | { |
456 | __u16 l3num; | |
457 | __u8 l4num; | |
458 | struct nf_conntrack_l4proto *l4proto; | |
91cb498e PNA |
459 | struct sk_buff *skb2; |
460 | int ret, err; | |
461 | ||
462 | if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO]) | |
463 | return -EINVAL; | |
464 | ||
465 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); | |
466 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); | |
467 | l4proto = nf_ct_l4proto_find_get(l3num, l4num); | |
468 | ||
469 | /* This protocol is not supported, skip. */ | |
470 | if (l4proto->l4proto != l4num) { | |
471 | err = -EOPNOTSUPP; | |
472 | goto err; | |
473 | } | |
474 | ||
475 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
476 | if (skb2 == NULL) { | |
477 | err = -ENOMEM; | |
478 | goto err; | |
479 | } | |
480 | ||
481 | ret = cttimeout_default_fill_info(net, skb2, NETLINK_CB(skb).portid, | |
482 | nlh->nlmsg_seq, | |
483 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
484 | IPCTNL_MSG_TIMEOUT_DEFAULT_SET, | |
485 | l4proto); | |
486 | if (ret <= 0) { | |
487 | kfree_skb(skb2); | |
488 | err = -ENOMEM; | |
489 | goto err; | |
490 | } | |
491 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); | |
492 | if (ret > 0) | |
493 | ret = 0; | |
494 | ||
495 | /* this avoids a loop in nfnetlink. */ | |
496 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
497 | err: | |
498 | nf_ct_l4proto_put(l4proto); | |
499 | return err; | |
500 | } | |
501 | ||
24de58f4 | 502 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
19576c94 PN |
503 | static struct ctnl_timeout * |
504 | ctnl_timeout_find_get(struct net *net, const char *name) | |
24de58f4 PNA |
505 | { |
506 | struct ctnl_timeout *timeout, *matching = NULL; | |
507 | ||
508 | rcu_read_lock(); | |
19576c94 | 509 | list_for_each_entry_rcu(timeout, &net->nfct_timeout_list, head) { |
24de58f4 PNA |
510 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
511 | continue; | |
512 | ||
513 | if (!try_module_get(THIS_MODULE)) | |
514 | goto err; | |
515 | ||
b54ab92b | 516 | if (!refcount_inc_not_zero(&timeout->refcnt)) { |
24de58f4 PNA |
517 | module_put(THIS_MODULE); |
518 | goto err; | |
519 | } | |
520 | matching = timeout; | |
521 | break; | |
522 | } | |
523 | err: | |
524 | rcu_read_unlock(); | |
525 | return matching; | |
526 | } | |
527 | ||
528 | static void ctnl_timeout_put(struct ctnl_timeout *timeout) | |
529 | { | |
b54ab92b | 530 | if (refcount_dec_and_test(&timeout->refcnt)) |
b75911b6 LZ |
531 | kfree_rcu(timeout, rcu_head); |
532 | ||
24de58f4 PNA |
533 | module_put(THIS_MODULE); |
534 | } | |
535 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ | |
536 | ||
50978462 PNA |
537 | static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = { |
538 | [IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout, | |
539 | .attr_count = CTA_TIMEOUT_MAX, | |
540 | .policy = cttimeout_nla_policy }, | |
541 | [IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout, | |
542 | .attr_count = CTA_TIMEOUT_MAX, | |
543 | .policy = cttimeout_nla_policy }, | |
544 | [IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout, | |
545 | .attr_count = CTA_TIMEOUT_MAX, | |
546 | .policy = cttimeout_nla_policy }, | |
91cb498e PNA |
547 | [IPCTNL_MSG_TIMEOUT_DEFAULT_SET]= { .call = cttimeout_default_set, |
548 | .attr_count = CTA_TIMEOUT_MAX, | |
549 | .policy = cttimeout_nla_policy }, | |
550 | [IPCTNL_MSG_TIMEOUT_DEFAULT_GET]= { .call = cttimeout_default_get, | |
551 | .attr_count = CTA_TIMEOUT_MAX, | |
552 | .policy = cttimeout_nla_policy }, | |
50978462 PNA |
553 | }; |
554 | ||
555 | static const struct nfnetlink_subsystem cttimeout_subsys = { | |
556 | .name = "conntrack_timeout", | |
557 | .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT, | |
558 | .cb_count = IPCTNL_MSG_TIMEOUT_MAX, | |
559 | .cb = cttimeout_cb, | |
560 | }; | |
561 | ||
562 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT); | |
563 | ||
19576c94 PN |
564 | static int __net_init cttimeout_net_init(struct net *net) |
565 | { | |
566 | INIT_LIST_HEAD(&net->nfct_timeout_list); | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
571 | static void __net_exit cttimeout_net_exit(struct net *net) | |
572 | { | |
573 | struct ctnl_timeout *cur, *tmp; | |
574 | ||
575 | ctnl_untimeout(net, NULL); | |
576 | ||
577 | list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, head) { | |
578 | list_del_rcu(&cur->head); | |
579 | nf_ct_l4proto_put(cur->l4proto); | |
b75911b6 | 580 | |
b54ab92b | 581 | if (refcount_dec_and_test(&cur->refcnt)) |
b75911b6 | 582 | kfree_rcu(cur, rcu_head); |
19576c94 PN |
583 | } |
584 | } | |
585 | ||
586 | static struct pernet_operations cttimeout_ops = { | |
587 | .init = cttimeout_net_init, | |
588 | .exit = cttimeout_net_exit, | |
589 | }; | |
590 | ||
50978462 PNA |
591 | static int __init cttimeout_init(void) |
592 | { | |
593 | int ret; | |
594 | ||
19576c94 PN |
595 | ret = register_pernet_subsys(&cttimeout_ops); |
596 | if (ret < 0) | |
597 | return ret; | |
598 | ||
50978462 PNA |
599 | ret = nfnetlink_subsys_register(&cttimeout_subsys); |
600 | if (ret < 0) { | |
601 | pr_err("cttimeout_init: cannot register cttimeout with " | |
602 | "nfnetlink.\n"); | |
603 | goto err_out; | |
604 | } | |
24de58f4 PNA |
605 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
606 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get); | |
607 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put); | |
608 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ | |
50978462 PNA |
609 | return 0; |
610 | ||
611 | err_out: | |
19576c94 | 612 | unregister_pernet_subsys(&cttimeout_ops); |
50978462 PNA |
613 | return ret; |
614 | } | |
615 | ||
616 | static void __exit cttimeout_exit(void) | |
617 | { | |
50978462 PNA |
618 | pr_info("cttimeout: unregistering from nfnetlink.\n"); |
619 | ||
620 | nfnetlink_subsys_unregister(&cttimeout_subsys); | |
ae2d708e | 621 | |
19576c94 | 622 | unregister_pernet_subsys(&cttimeout_ops); |
24de58f4 PNA |
623 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
624 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL); | |
625 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL); | |
3b7dabf0 | 626 | synchronize_rcu(); |
24de58f4 | 627 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
50978462 PNA |
628 | } |
629 | ||
630 | module_init(cttimeout_init); | |
631 | module_exit(cttimeout_exit); |