Commit | Line | Data |
---|---|---|
e97150df | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
50978462 PNA |
2 | /* |
3 | * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org> | |
4 | * (C) 2012 by Vyatta Inc. <http://www.vyatta.com> | |
50978462 PNA |
5 | */ |
6 | #include <linux/init.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/rculist.h> | |
10 | #include <linux/rculist_nulls.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/timer.h> | |
13 | #include <linux/security.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/netlink.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/slab.h> | |
20 | ||
21 | #include <linux/netfilter.h> | |
22 | #include <net/netlink.h> | |
23 | #include <net/sock.h> | |
24 | #include <net/netfilter/nf_conntrack.h> | |
25 | #include <net/netfilter/nf_conntrack_core.h> | |
50978462 PNA |
26 | #include <net/netfilter/nf_conntrack_l4proto.h> |
27 | #include <net/netfilter/nf_conntrack_tuple.h> | |
24de58f4 | 28 | #include <net/netfilter/nf_conntrack_timeout.h> |
50978462 PNA |
29 | |
30 | #include <linux/netfilter/nfnetlink.h> | |
31 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
32 | ||
33 | MODULE_LICENSE("GPL"); | |
34 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
35 | MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tuning"); | |
36 | ||
50978462 | 37 | static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = { |
e93b5f9f FW |
38 | [CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING, |
39 | .len = CTNL_TIMEOUT_NAME_MAX - 1}, | |
50978462 PNA |
40 | [CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 }, |
41 | [CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 }, | |
42 | [CTA_TIMEOUT_DATA] = { .type = NLA_NESTED }, | |
43 | }; | |
44 | ||
45 | static int | |
c779e849 | 46 | ctnl_timeout_parse_policy(void *timeout, |
2a04aabf | 47 | const struct nf_conntrack_l4proto *l4proto, |
91cb498e | 48 | struct net *net, const struct nlattr *attr) |
50978462 | 49 | { |
8039ab43 | 50 | struct nlattr **tb; |
50978462 PNA |
51 | int ret = 0; |
52 | ||
8039ab43 GS |
53 | tb = kcalloc(l4proto->ctnl_timeout.nlattr_max + 1, sizeof(*tb), |
54 | GFP_KERNEL); | |
50978462 | 55 | |
8039ab43 GS |
56 | if (!tb) |
57 | return -ENOMEM; | |
58 | ||
8cb08174 JB |
59 | ret = nla_parse_nested_deprecated(tb, |
60 | l4proto->ctnl_timeout.nlattr_max, | |
61 | attr, | |
62 | l4proto->ctnl_timeout.nla_policy, | |
63 | NULL); | |
8039ab43 GS |
64 | if (ret < 0) |
65 | goto err; | |
66 | ||
c779e849 | 67 | ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeout); |
8039ab43 GS |
68 | |
69 | err: | |
70 | kfree(tb); | |
50978462 PNA |
71 | return ret; |
72 | } | |
73 | ||
7b8002a1 PNA |
74 | static int cttimeout_new_timeout(struct net *net, struct sock *ctnl, |
75 | struct sk_buff *skb, | |
76 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
77 | const struct nlattr * const cda[], |
78 | struct netlink_ext_ack *extack) | |
50978462 PNA |
79 | { |
80 | __u16 l3num; | |
81 | __u8 l4num; | |
b3480fe0 | 82 | const struct nf_conntrack_l4proto *l4proto; |
50978462 PNA |
83 | struct ctnl_timeout *timeout, *matching = NULL; |
84 | char *name; | |
85 | int ret; | |
86 | ||
87 | if (!cda[CTA_TIMEOUT_NAME] || | |
88 | !cda[CTA_TIMEOUT_L3PROTO] || | |
89 | !cda[CTA_TIMEOUT_L4PROTO] || | |
90 | !cda[CTA_TIMEOUT_DATA]) | |
91 | return -EINVAL; | |
92 | ||
93 | name = nla_data(cda[CTA_TIMEOUT_NAME]); | |
94 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); | |
95 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); | |
96 | ||
19576c94 | 97 | list_for_each_entry(timeout, &net->nfct_timeout_list, head) { |
50978462 PNA |
98 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
99 | continue; | |
100 | ||
101 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
102 | return -EEXIST; | |
103 | ||
104 | matching = timeout; | |
105 | break; | |
106 | } | |
107 | ||
50978462 PNA |
108 | if (matching) { |
109 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { | |
110 | /* You cannot replace one timeout policy by another of | |
111 | * different kind, sorry. | |
112 | */ | |
6c1fd7dc PNA |
113 | if (matching->timeout.l3num != l3num || |
114 | matching->timeout.l4proto->l4proto != l4num) | |
23aaba5a LZ |
115 | return -EINVAL; |
116 | ||
6c1fd7dc PNA |
117 | return ctnl_timeout_parse_policy(&matching->timeout.data, |
118 | matching->timeout.l4proto, | |
119 | net, cda[CTA_TIMEOUT_DATA]); | |
50978462 | 120 | } |
23aaba5a LZ |
121 | |
122 | return -EBUSY; | |
123 | } | |
124 | ||
4a60dc74 | 125 | l4proto = nf_ct_l4proto_find(l4num); |
23aaba5a LZ |
126 | |
127 | /* This protocol is not supportted, skip. */ | |
128 | if (l4proto->l4proto != l4num) { | |
129 | ret = -EOPNOTSUPP; | |
c1ebd7df | 130 | goto err_proto_put; |
50978462 PNA |
131 | } |
132 | ||
133 | timeout = kzalloc(sizeof(struct ctnl_timeout) + | |
134 | l4proto->ctnl_timeout.obj_size, GFP_KERNEL); | |
c1ebd7df PNA |
135 | if (timeout == NULL) { |
136 | ret = -ENOMEM; | |
137 | goto err_proto_put; | |
138 | } | |
50978462 | 139 | |
6c1fd7dc | 140 | ret = ctnl_timeout_parse_policy(&timeout->timeout.data, l4proto, net, |
50978462 PNA |
141 | cda[CTA_TIMEOUT_DATA]); |
142 | if (ret < 0) | |
143 | goto err; | |
144 | ||
145 | strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME])); | |
6c1fd7dc PNA |
146 | timeout->timeout.l3num = l3num; |
147 | timeout->timeout.l4proto = l4proto; | |
b54ab92b | 148 | refcount_set(&timeout->refcnt, 1); |
19576c94 | 149 | list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list); |
50978462 PNA |
150 | |
151 | return 0; | |
152 | err: | |
153 | kfree(timeout); | |
c1ebd7df | 154 | err_proto_put: |
50978462 PNA |
155 | return ret; |
156 | } | |
157 | ||
158 | static int | |
15e47304 | 159 | ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
50978462 PNA |
160 | int event, struct ctnl_timeout *timeout) |
161 | { | |
162 | struct nlmsghdr *nlh; | |
163 | struct nfgenmsg *nfmsg; | |
15e47304 | 164 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
6c1fd7dc | 165 | const struct nf_conntrack_l4proto *l4proto = timeout->timeout.l4proto; |
4430b897 PNA |
166 | struct nlattr *nest_parms; |
167 | int ret; | |
50978462 | 168 | |
dedb67c4 | 169 | event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event); |
15e47304 | 170 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
50978462 PNA |
171 | if (nlh == NULL) |
172 | goto nlmsg_failure; | |
173 | ||
174 | nfmsg = nlmsg_data(nlh); | |
175 | nfmsg->nfgen_family = AF_UNSPEC; | |
176 | nfmsg->version = NFNETLINK_V0; | |
177 | nfmsg->res_id = 0; | |
178 | ||
48f03bda | 179 | if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) || |
6c1fd7dc PNA |
180 | nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, |
181 | htons(timeout->timeout.l3num)) || | |
182 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto) || | |
48f03bda | 183 | nla_put_be32(skb, CTA_TIMEOUT_USE, |
b54ab92b | 184 | htonl(refcount_read(&timeout->refcnt)))) |
48f03bda | 185 | goto nla_put_failure; |
50978462 | 186 | |
ae0be8de | 187 | nest_parms = nla_nest_start(skb, CTA_TIMEOUT_DATA); |
4430b897 PNA |
188 | if (!nest_parms) |
189 | goto nla_put_failure; | |
50978462 | 190 | |
4430b897 PNA |
191 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->timeout.data); |
192 | if (ret < 0) | |
193 | goto nla_put_failure; | |
50978462 | 194 | |
4430b897 | 195 | nla_nest_end(skb, nest_parms); |
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, | |
04ba724b PNA |
244 | const struct nlattr * const cda[], |
245 | struct netlink_ext_ack *extack) | |
50978462 PNA |
246 | { |
247 | int ret = -ENOENT; | |
248 | char *name; | |
249 | struct ctnl_timeout *cur; | |
250 | ||
251 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
252 | struct netlink_dump_control c = { | |
253 | .dump = ctnl_timeout_dump, | |
254 | }; | |
255 | return netlink_dump_start(ctnl, skb, nlh, &c); | |
256 | } | |
257 | ||
258 | if (!cda[CTA_TIMEOUT_NAME]) | |
259 | return -EINVAL; | |
260 | name = nla_data(cda[CTA_TIMEOUT_NAME]); | |
261 | ||
19576c94 | 262 | list_for_each_entry(cur, &net->nfct_timeout_list, head) { |
50978462 PNA |
263 | struct sk_buff *skb2; |
264 | ||
265 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) | |
266 | continue; | |
267 | ||
268 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
269 | if (skb2 == NULL) { | |
270 | ret = -ENOMEM; | |
271 | break; | |
272 | } | |
273 | ||
15e47304 | 274 | ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid, |
50978462 PNA |
275 | nlh->nlmsg_seq, |
276 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
277 | IPCTNL_MSG_TIMEOUT_NEW, cur); | |
278 | if (ret <= 0) { | |
279 | kfree_skb(skb2); | |
280 | break; | |
281 | } | |
15e47304 | 282 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, |
50978462 PNA |
283 | MSG_DONTWAIT); |
284 | if (ret > 0) | |
285 | ret = 0; | |
286 | ||
287 | /* this avoids a loop in nfnetlink. */ | |
288 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
289 | } | |
290 | return ret; | |
291 | } | |
292 | ||
293 | /* try to delete object, fail if it is still in use. */ | |
19576c94 | 294 | static int ctnl_timeout_try_del(struct net *net, struct ctnl_timeout *timeout) |
50978462 PNA |
295 | { |
296 | int ret = 0; | |
297 | ||
b75911b6 LZ |
298 | /* We want to avoid races with ctnl_timeout_put. So only when the |
299 | * current refcnt is 1, we decrease it to 0. | |
300 | */ | |
b54ab92b | 301 | if (refcount_dec_if_one(&timeout->refcnt)) { |
50978462 PNA |
302 | /* We are protected by nfnl mutex. */ |
303 | list_del_rcu(&timeout->head); | |
6c1fd7dc | 304 | nf_ct_untimeout(net, &timeout->timeout); |
50978462 PNA |
305 | kfree_rcu(timeout, rcu_head); |
306 | } else { | |
50978462 PNA |
307 | ret = -EBUSY; |
308 | } | |
309 | return ret; | |
310 | } | |
311 | ||
7b8002a1 PNA |
312 | static int cttimeout_del_timeout(struct net *net, struct sock *ctnl, |
313 | struct sk_buff *skb, | |
314 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
315 | const struct nlattr * const cda[], |
316 | struct netlink_ext_ack *extack) | |
50978462 | 317 | { |
93fac10b | 318 | struct ctnl_timeout *cur, *tmp; |
50978462 | 319 | int ret = -ENOENT; |
7b8002a1 | 320 | char *name; |
50978462 PNA |
321 | |
322 | if (!cda[CTA_TIMEOUT_NAME]) { | |
93fac10b LZ |
323 | list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, |
324 | head) | |
19576c94 | 325 | ctnl_timeout_try_del(net, cur); |
50978462 PNA |
326 | |
327 | return 0; | |
328 | } | |
329 | name = nla_data(cda[CTA_TIMEOUT_NAME]); | |
330 | ||
19576c94 | 331 | list_for_each_entry(cur, &net->nfct_timeout_list, head) { |
50978462 PNA |
332 | if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
333 | continue; | |
334 | ||
19576c94 | 335 | ret = ctnl_timeout_try_del(net, cur); |
50978462 PNA |
336 | if (ret < 0) |
337 | return ret; | |
338 | ||
339 | break; | |
340 | } | |
341 | return ret; | |
342 | } | |
343 | ||
7b8002a1 PNA |
344 | static int cttimeout_default_set(struct net *net, struct sock *ctnl, |
345 | struct sk_buff *skb, | |
346 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
347 | const struct nlattr * const cda[], |
348 | struct netlink_ext_ack *extack) | |
91cb498e | 349 | { |
b3480fe0 | 350 | const struct nf_conntrack_l4proto *l4proto; |
91cb498e | 351 | __u8 l4num; |
91cb498e PNA |
352 | int ret; |
353 | ||
354 | if (!cda[CTA_TIMEOUT_L3PROTO] || | |
355 | !cda[CTA_TIMEOUT_L4PROTO] || | |
356 | !cda[CTA_TIMEOUT_DATA]) | |
357 | return -EINVAL; | |
358 | ||
91cb498e | 359 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); |
4a60dc74 | 360 | l4proto = nf_ct_l4proto_find(l4num); |
91cb498e PNA |
361 | |
362 | /* This protocol is not supported, skip. */ | |
363 | if (l4proto->l4proto != l4num) { | |
364 | ret = -EOPNOTSUPP; | |
365 | goto err; | |
366 | } | |
367 | ||
c779e849 | 368 | ret = ctnl_timeout_parse_policy(NULL, l4proto, net, |
91cb498e PNA |
369 | cda[CTA_TIMEOUT_DATA]); |
370 | if (ret < 0) | |
371 | goto err; | |
372 | ||
91cb498e PNA |
373 | return 0; |
374 | err: | |
91cb498e PNA |
375 | return ret; |
376 | } | |
377 | ||
378 | static int | |
379 | cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid, | |
dd2934a9 | 380 | u32 seq, u32 type, int event, u16 l3num, |
8866df92 PNA |
381 | const struct nf_conntrack_l4proto *l4proto, |
382 | const unsigned int *timeouts) | |
91cb498e PNA |
383 | { |
384 | struct nlmsghdr *nlh; | |
385 | struct nfgenmsg *nfmsg; | |
386 | unsigned int flags = portid ? NLM_F_MULTI : 0; | |
4430b897 PNA |
387 | struct nlattr *nest_parms; |
388 | int ret; | |
91cb498e | 389 | |
dedb67c4 | 390 | event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event); |
91cb498e PNA |
391 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
392 | if (nlh == NULL) | |
393 | goto nlmsg_failure; | |
394 | ||
395 | nfmsg = nlmsg_data(nlh); | |
396 | nfmsg->nfgen_family = AF_UNSPEC; | |
397 | nfmsg->version = NFNETLINK_V0; | |
398 | nfmsg->res_id = 0; | |
399 | ||
dd2934a9 | 400 | if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l3num)) || |
91cb498e PNA |
401 | nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto)) |
402 | goto nla_put_failure; | |
403 | ||
ae0be8de | 404 | nest_parms = nla_nest_start(skb, CTA_TIMEOUT_DATA); |
4430b897 PNA |
405 | if (!nest_parms) |
406 | goto nla_put_failure; | |
91cb498e | 407 | |
8866df92 | 408 | ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts); |
4430b897 PNA |
409 | if (ret < 0) |
410 | goto nla_put_failure; | |
91cb498e | 411 | |
4430b897 | 412 | nla_nest_end(skb, nest_parms); |
91cb498e PNA |
413 | |
414 | nlmsg_end(skb, nlh); | |
415 | return skb->len; | |
416 | ||
417 | nlmsg_failure: | |
418 | nla_put_failure: | |
419 | nlmsg_cancel(skb, nlh); | |
420 | return -1; | |
421 | } | |
422 | ||
7b8002a1 PNA |
423 | static int cttimeout_default_get(struct net *net, struct sock *ctnl, |
424 | struct sk_buff *skb, | |
91cb498e | 425 | const struct nlmsghdr *nlh, |
04ba724b PNA |
426 | const struct nlattr * const cda[], |
427 | struct netlink_ext_ack *extack) | |
91cb498e | 428 | { |
b3480fe0 | 429 | const struct nf_conntrack_l4proto *l4proto; |
8866df92 | 430 | unsigned int *timeouts = NULL; |
91cb498e PNA |
431 | struct sk_buff *skb2; |
432 | int ret, err; | |
b3480fe0 FW |
433 | __u16 l3num; |
434 | __u8 l4num; | |
91cb498e PNA |
435 | |
436 | if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO]) | |
437 | return -EINVAL; | |
438 | ||
439 | l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); | |
440 | l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); | |
4a60dc74 | 441 | l4proto = nf_ct_l4proto_find(l4num); |
91cb498e | 442 | |
8866df92 PNA |
443 | err = -EOPNOTSUPP; |
444 | if (l4proto->l4proto != l4num) | |
91cb498e | 445 | goto err; |
8866df92 PNA |
446 | |
447 | switch (l4proto->l4proto) { | |
448 | case IPPROTO_ICMP: | |
449 | timeouts = &nf_icmp_pernet(net)->timeout; | |
450 | break; | |
451 | case IPPROTO_TCP: | |
452 | timeouts = nf_tcp_pernet(net)->timeouts; | |
453 | break; | |
89259088 FW |
454 | case IPPROTO_UDP: /* fallthrough */ |
455 | case IPPROTO_UDPLITE: | |
8866df92 PNA |
456 | timeouts = nf_udp_pernet(net)->timeouts; |
457 | break; | |
458 | case IPPROTO_DCCP: | |
459 | #ifdef CONFIG_NF_CT_PROTO_DCCP | |
460 | timeouts = nf_dccp_pernet(net)->dccp_timeout; | |
461 | #endif | |
462 | break; | |
463 | case IPPROTO_ICMPV6: | |
464 | timeouts = &nf_icmpv6_pernet(net)->timeout; | |
465 | break; | |
466 | case IPPROTO_SCTP: | |
467 | #ifdef CONFIG_NF_CT_PROTO_SCTP | |
468 | timeouts = nf_sctp_pernet(net)->timeouts; | |
89259088 FW |
469 | #endif |
470 | break; | |
471 | case IPPROTO_GRE: | |
472 | #ifdef CONFIG_NF_CT_PROTO_GRE | |
22fc4c4c | 473 | timeouts = nf_gre_pernet(net)->timeouts; |
8866df92 PNA |
474 | #endif |
475 | break; | |
476 | case 255: | |
477 | timeouts = &nf_generic_pernet(net)->timeout; | |
478 | break; | |
479 | default: | |
89259088 | 480 | WARN_ONCE(1, "Missing timeouts for proto %d", l4proto->l4proto); |
8866df92 | 481 | break; |
91cb498e PNA |
482 | } |
483 | ||
8866df92 PNA |
484 | if (!timeouts) |
485 | goto err; | |
486 | ||
91cb498e PNA |
487 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
488 | if (skb2 == NULL) { | |
489 | err = -ENOMEM; | |
490 | goto err; | |
491 | } | |
492 | ||
493 | ret = cttimeout_default_fill_info(net, skb2, NETLINK_CB(skb).portid, | |
494 | nlh->nlmsg_seq, | |
495 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
496 | IPCTNL_MSG_TIMEOUT_DEFAULT_SET, | |
8866df92 | 497 | l3num, l4proto, timeouts); |
91cb498e PNA |
498 | if (ret <= 0) { |
499 | kfree_skb(skb2); | |
500 | err = -ENOMEM; | |
501 | goto err; | |
502 | } | |
503 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); | |
504 | if (ret > 0) | |
505 | ret = 0; | |
506 | ||
507 | /* this avoids a loop in nfnetlink. */ | |
508 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
509 | err: | |
91cb498e PNA |
510 | return err; |
511 | } | |
512 | ||
99e25d07 PNA |
513 | static struct nf_ct_timeout *ctnl_timeout_find_get(struct net *net, |
514 | const char *name) | |
24de58f4 PNA |
515 | { |
516 | struct ctnl_timeout *timeout, *matching = NULL; | |
517 | ||
19576c94 | 518 | list_for_each_entry_rcu(timeout, &net->nfct_timeout_list, head) { |
24de58f4 PNA |
519 | if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) |
520 | continue; | |
521 | ||
522 | if (!try_module_get(THIS_MODULE)) | |
523 | goto err; | |
524 | ||
b54ab92b | 525 | if (!refcount_inc_not_zero(&timeout->refcnt)) { |
24de58f4 PNA |
526 | module_put(THIS_MODULE); |
527 | goto err; | |
528 | } | |
529 | matching = timeout; | |
530 | break; | |
531 | } | |
532 | err: | |
99e25d07 | 533 | return matching ? &matching->timeout : NULL; |
24de58f4 PNA |
534 | } |
535 | ||
6c1fd7dc | 536 | static void ctnl_timeout_put(struct nf_ct_timeout *t) |
24de58f4 | 537 | { |
6c1fd7dc PNA |
538 | struct ctnl_timeout *timeout = |
539 | container_of(t, struct ctnl_timeout, timeout); | |
540 | ||
b54ab92b | 541 | if (refcount_dec_and_test(&timeout->refcnt)) |
b75911b6 LZ |
542 | kfree_rcu(timeout, rcu_head); |
543 | ||
24de58f4 PNA |
544 | module_put(THIS_MODULE); |
545 | } | |
24de58f4 | 546 | |
50978462 PNA |
547 | static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = { |
548 | [IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout, | |
549 | .attr_count = CTA_TIMEOUT_MAX, | |
550 | .policy = cttimeout_nla_policy }, | |
551 | [IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout, | |
552 | .attr_count = CTA_TIMEOUT_MAX, | |
553 | .policy = cttimeout_nla_policy }, | |
554 | [IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout, | |
555 | .attr_count = CTA_TIMEOUT_MAX, | |
556 | .policy = cttimeout_nla_policy }, | |
91cb498e PNA |
557 | [IPCTNL_MSG_TIMEOUT_DEFAULT_SET]= { .call = cttimeout_default_set, |
558 | .attr_count = CTA_TIMEOUT_MAX, | |
559 | .policy = cttimeout_nla_policy }, | |
560 | [IPCTNL_MSG_TIMEOUT_DEFAULT_GET]= { .call = cttimeout_default_get, | |
561 | .attr_count = CTA_TIMEOUT_MAX, | |
562 | .policy = cttimeout_nla_policy }, | |
50978462 PNA |
563 | }; |
564 | ||
565 | static const struct nfnetlink_subsystem cttimeout_subsys = { | |
566 | .name = "conntrack_timeout", | |
567 | .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT, | |
568 | .cb_count = IPCTNL_MSG_TIMEOUT_MAX, | |
569 | .cb = cttimeout_cb, | |
570 | }; | |
571 | ||
572 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT); | |
573 | ||
19576c94 PN |
574 | static int __net_init cttimeout_net_init(struct net *net) |
575 | { | |
576 | INIT_LIST_HEAD(&net->nfct_timeout_list); | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | static void __net_exit cttimeout_net_exit(struct net *net) | |
582 | { | |
583 | struct ctnl_timeout *cur, *tmp; | |
584 | ||
84657984 | 585 | nf_ct_unconfirmed_destroy(net); |
4e665afb | 586 | nf_ct_untimeout(net, NULL); |
19576c94 PN |
587 | |
588 | list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, head) { | |
589 | list_del_rcu(&cur->head); | |
b75911b6 | 590 | |
b54ab92b | 591 | if (refcount_dec_and_test(&cur->refcnt)) |
b75911b6 | 592 | kfree_rcu(cur, rcu_head); |
19576c94 PN |
593 | } |
594 | } | |
595 | ||
596 | static struct pernet_operations cttimeout_ops = { | |
597 | .init = cttimeout_net_init, | |
598 | .exit = cttimeout_net_exit, | |
599 | }; | |
600 | ||
50978462 PNA |
601 | static int __init cttimeout_init(void) |
602 | { | |
603 | int ret; | |
604 | ||
19576c94 PN |
605 | ret = register_pernet_subsys(&cttimeout_ops); |
606 | if (ret < 0) | |
607 | return ret; | |
608 | ||
50978462 PNA |
609 | ret = nfnetlink_subsys_register(&cttimeout_subsys); |
610 | if (ret < 0) { | |
611 | pr_err("cttimeout_init: cannot register cttimeout with " | |
612 | "nfnetlink.\n"); | |
613 | goto err_out; | |
614 | } | |
24de58f4 PNA |
615 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get); |
616 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put); | |
50978462 PNA |
617 | return 0; |
618 | ||
619 | err_out: | |
19576c94 | 620 | unregister_pernet_subsys(&cttimeout_ops); |
50978462 PNA |
621 | return ret; |
622 | } | |
623 | ||
624 | static void __exit cttimeout_exit(void) | |
625 | { | |
50978462 | 626 | nfnetlink_subsys_unregister(&cttimeout_subsys); |
ae2d708e | 627 | |
19576c94 | 628 | unregister_pernet_subsys(&cttimeout_ops); |
24de58f4 PNA |
629 | RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL); |
630 | RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL); | |
3b7dabf0 | 631 | synchronize_rcu(); |
50978462 PNA |
632 | } |
633 | ||
634 | module_init(cttimeout_init); | |
635 | module_exit(cttimeout_exit); |