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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
4 * (C) 2012 by Vyatta Inc. <http://www.vyatta.com>
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/netns/generic.h>
24#include <net/sock.h>
25#include <net/netfilter/nf_conntrack.h>
26#include <net/netfilter/nf_conntrack_core.h>
27#include <net/netfilter/nf_conntrack_l4proto.h>
28#include <net/netfilter/nf_conntrack_tuple.h>
29#include <net/netfilter/nf_conntrack_timeout.h>
30
31#include <linux/netfilter/nfnetlink.h>
32#include <linux/netfilter/nfnetlink_cttimeout.h>
33
34static unsigned int nfct_timeout_id __read_mostly;
35
36struct nfct_timeout_pernet {
37 struct list_head nfct_timeout_list;
38};
39
40MODULE_LICENSE("GPL");
41MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
42MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tuning");
43
44static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = {
45 [CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING,
46 .len = CTNL_TIMEOUT_NAME_MAX - 1},
47 [CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 },
48 [CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 },
49 [CTA_TIMEOUT_DATA] = { .type = NLA_NESTED },
50};
51
52static struct nfct_timeout_pernet *nfct_timeout_pernet(struct net *net)
53{
54 return net_generic(net, nfct_timeout_id);
55}
56
57static int
58ctnl_timeout_parse_policy(void *timeout,
59 const struct nf_conntrack_l4proto *l4proto,
60 struct net *net, const struct nlattr *attr)
61{
62 struct nlattr **tb;
63 int ret = 0;
64
65 tb = kcalloc(l4proto->ctnl_timeout.nlattr_max + 1, sizeof(*tb),
66 GFP_KERNEL);
67
68 if (!tb)
69 return -ENOMEM;
70
71 ret = nla_parse_nested_deprecated(tb,
72 l4proto->ctnl_timeout.nlattr_max,
73 attr,
74 l4proto->ctnl_timeout.nla_policy,
75 NULL);
76 if (ret < 0)
77 goto err;
78
79 ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeout);
80
81err:
82 kfree(tb);
83 return ret;
84}
85
86static int cttimeout_new_timeout(struct sk_buff *skb,
87 const struct nfnl_info *info,
88 const struct nlattr * const cda[])
89{
90 struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(info->net);
91 __u16 l3num;
92 __u8 l4num;
93 const struct nf_conntrack_l4proto *l4proto;
94 struct ctnl_timeout *timeout, *matching = NULL;
95 char *name;
96 int ret;
97
98 if (!cda[CTA_TIMEOUT_NAME] ||
99 !cda[CTA_TIMEOUT_L3PROTO] ||
100 !cda[CTA_TIMEOUT_L4PROTO] ||
101 !cda[CTA_TIMEOUT_DATA])
102 return -EINVAL;
103
104 name = nla_data(cda[CTA_TIMEOUT_NAME]);
105 l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
106 l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
107
108 list_for_each_entry(timeout, &pernet->nfct_timeout_list, head) {
109 if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
110 continue;
111
112 if (info->nlh->nlmsg_flags & NLM_F_EXCL)
113 return -EEXIST;
114
115 matching = timeout;
116 break;
117 }
118
119 if (matching) {
120 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
121 /* You cannot replace one timeout policy by another of
122 * different kind, sorry.
123 */
124 if (matching->timeout.l3num != l3num ||
125 matching->timeout.l4proto->l4proto != l4num)
126 return -EINVAL;
127
128 return ctnl_timeout_parse_policy(&matching->timeout.data,
129 matching->timeout.l4proto,
130 info->net,
131 cda[CTA_TIMEOUT_DATA]);
132 }
133
134 return -EBUSY;
135 }
136
137 l4proto = nf_ct_l4proto_find(l4num);
138
139 /* This protocol is not supportted, skip. */
140 if (l4proto->l4proto != l4num) {
141 ret = -EOPNOTSUPP;
142 goto err_proto_put;
143 }
144
145 timeout = kzalloc(sizeof(struct ctnl_timeout) +
146 l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
147 if (timeout == NULL) {
148 ret = -ENOMEM;
149 goto err_proto_put;
150 }
151
152 ret = ctnl_timeout_parse_policy(&timeout->timeout.data, l4proto,
153 info->net, cda[CTA_TIMEOUT_DATA]);
154 if (ret < 0)
155 goto err;
156
157 strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME]));
158 timeout->timeout.l3num = l3num;
159 timeout->timeout.l4proto = l4proto;
160 refcount_set(&timeout->refcnt, 1);
161 list_add_tail_rcu(&timeout->head, &pernet->nfct_timeout_list);
162
163 return 0;
164err:
165 kfree(timeout);
166err_proto_put:
167 return ret;
168}
169
170static int
171ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
172 int event, struct ctnl_timeout *timeout)
173{
174 struct nlmsghdr *nlh;
175 unsigned int flags = portid ? NLM_F_MULTI : 0;
176 const struct nf_conntrack_l4proto *l4proto = timeout->timeout.l4proto;
177 struct nlattr *nest_parms;
178 int ret;
179
180 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
181 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
182 NFNETLINK_V0, 0);
183 if (!nlh)
184 goto nlmsg_failure;
185
186 if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) ||
187 nla_put_be16(skb, CTA_TIMEOUT_L3PROTO,
188 htons(timeout->timeout.l3num)) ||
189 nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto) ||
190 nla_put_be32(skb, CTA_TIMEOUT_USE,
191 htonl(refcount_read(&timeout->refcnt))))
192 goto nla_put_failure;
193
194 nest_parms = nla_nest_start(skb, CTA_TIMEOUT_DATA);
195 if (!nest_parms)
196 goto nla_put_failure;
197
198 ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->timeout.data);
199 if (ret < 0)
200 goto nla_put_failure;
201
202 nla_nest_end(skb, nest_parms);
203
204 nlmsg_end(skb, nlh);
205 return skb->len;
206
207nlmsg_failure:
208nla_put_failure:
209 nlmsg_cancel(skb, nlh);
210 return -1;
211}
212
213static int
214ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb)
215{
216 struct nfct_timeout_pernet *pernet;
217 struct net *net = sock_net(skb->sk);
218 struct ctnl_timeout *cur, *last;
219
220 if (cb->args[2])
221 return 0;
222
223 last = (struct ctnl_timeout *)cb->args[1];
224 if (cb->args[1])
225 cb->args[1] = 0;
226
227 rcu_read_lock();
228 pernet = nfct_timeout_pernet(net);
229 list_for_each_entry_rcu(cur, &pernet->nfct_timeout_list, head) {
230 if (last) {
231 if (cur != last)
232 continue;
233
234 last = NULL;
235 }
236 if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid,
237 cb->nlh->nlmsg_seq,
238 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
239 IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) {
240 cb->args[1] = (unsigned long)cur;
241 break;
242 }
243 }
244 if (!cb->args[1])
245 cb->args[2] = 1;
246 rcu_read_unlock();
247 return skb->len;
248}
249
250static int cttimeout_get_timeout(struct sk_buff *skb,
251 const struct nfnl_info *info,
252 const struct nlattr * const cda[])
253{
254 struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(info->net);
255 int ret = -ENOENT;
256 char *name;
257 struct ctnl_timeout *cur;
258
259 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
260 struct netlink_dump_control c = {
261 .dump = ctnl_timeout_dump,
262 };
263 return netlink_dump_start(info->sk, skb, info->nlh, &c);
264 }
265
266 if (!cda[CTA_TIMEOUT_NAME])
267 return -EINVAL;
268 name = nla_data(cda[CTA_TIMEOUT_NAME]);
269
270 list_for_each_entry(cur, &pernet->nfct_timeout_list, head) {
271 struct sk_buff *skb2;
272
273 if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
274 continue;
275
276 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
277 if (skb2 == NULL) {
278 ret = -ENOMEM;
279 break;
280 }
281
282 ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid,
283 info->nlh->nlmsg_seq,
284 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
285 IPCTNL_MSG_TIMEOUT_NEW, cur);
286 if (ret <= 0) {
287 kfree_skb(skb2);
288 break;
289 }
290
291 ret = nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
292 break;
293 }
294
295 return ret;
296}
297
298/* try to delete object, fail if it is still in use. */
299static int ctnl_timeout_try_del(struct net *net, struct ctnl_timeout *timeout)
300{
301 int ret = 0;
302
303 /* We want to avoid races with ctnl_timeout_put. So only when the
304 * current refcnt is 1, we decrease it to 0.
305 */
306 if (refcount_dec_if_one(&timeout->refcnt)) {
307 /* We are protected by nfnl mutex. */
308 list_del_rcu(&timeout->head);
309 nf_ct_untimeout(net, &timeout->timeout);
310 kfree_rcu(timeout, rcu_head);
311 } else {
312 ret = -EBUSY;
313 }
314 return ret;
315}
316
317static int cttimeout_del_timeout(struct sk_buff *skb,
318 const struct nfnl_info *info,
319 const struct nlattr * const cda[])
320{
321 struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(info->net);
322 struct ctnl_timeout *cur, *tmp;
323 int ret = -ENOENT;
324 char *name;
325
326 if (!cda[CTA_TIMEOUT_NAME]) {
327 list_for_each_entry_safe(cur, tmp, &pernet->nfct_timeout_list,
328 head)
329 ctnl_timeout_try_del(info->net, cur);
330
331 return 0;
332 }
333 name = nla_data(cda[CTA_TIMEOUT_NAME]);
334
335 list_for_each_entry(cur, &pernet->nfct_timeout_list, head) {
336 if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
337 continue;
338
339 ret = ctnl_timeout_try_del(info->net, cur);
340 if (ret < 0)
341 return ret;
342
343 break;
344 }
345 return ret;
346}
347
348static int cttimeout_default_set(struct sk_buff *skb,
349 const struct nfnl_info *info,
350 const struct nlattr * const cda[])
351{
352 const struct nf_conntrack_l4proto *l4proto;
353 __u8 l4num;
354 int ret;
355
356 if (!cda[CTA_TIMEOUT_L3PROTO] ||
357 !cda[CTA_TIMEOUT_L4PROTO] ||
358 !cda[CTA_TIMEOUT_DATA])
359 return -EINVAL;
360
361 l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
362 l4proto = nf_ct_l4proto_find(l4num);
363
364 /* This protocol is not supported, skip. */
365 if (l4proto->l4proto != l4num) {
366 ret = -EOPNOTSUPP;
367 goto err;
368 }
369
370 ret = ctnl_timeout_parse_policy(NULL, l4proto, info->net,
371 cda[CTA_TIMEOUT_DATA]);
372 if (ret < 0)
373 goto err;
374
375 return 0;
376err:
377 return ret;
378}
379
380static int
381cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid,
382 u32 seq, u32 type, int event, u16 l3num,
383 const struct nf_conntrack_l4proto *l4proto,
384 const unsigned int *timeouts)
385{
386 struct nlmsghdr *nlh;
387 unsigned int flags = portid ? NLM_F_MULTI : 0;
388 struct nlattr *nest_parms;
389 int ret;
390
391 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
392 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
393 NFNETLINK_V0, 0);
394 if (!nlh)
395 goto nlmsg_failure;
396
397 if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l3num)) ||
398 nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto))
399 goto nla_put_failure;
400
401 nest_parms = nla_nest_start(skb, CTA_TIMEOUT_DATA);
402 if (!nest_parms)
403 goto nla_put_failure;
404
405 ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts);
406 if (ret < 0)
407 goto nla_put_failure;
408
409 nla_nest_end(skb, nest_parms);
410
411 nlmsg_end(skb, nlh);
412 return skb->len;
413
414nlmsg_failure:
415nla_put_failure:
416 nlmsg_cancel(skb, nlh);
417 return -1;
418}
419
420static int cttimeout_default_get(struct sk_buff *skb,
421 const struct nfnl_info *info,
422 const struct nlattr * const cda[])
423{
424 const struct nf_conntrack_l4proto *l4proto;
425 unsigned int *timeouts = NULL;
426 struct sk_buff *skb2;
427 __u16 l3num;
428 __u8 l4num;
429 int ret;
430
431 if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO])
432 return -EINVAL;
433
434 l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
435 l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
436 l4proto = nf_ct_l4proto_find(l4num);
437
438 if (l4proto->l4proto != l4num)
439 return -EOPNOTSUPP;
440
441 switch (l4proto->l4proto) {
442 case IPPROTO_ICMP:
443 timeouts = &nf_icmp_pernet(info->net)->timeout;
444 break;
445 case IPPROTO_TCP:
446 timeouts = nf_tcp_pernet(info->net)->timeouts;
447 break;
448 case IPPROTO_UDP:
449 case IPPROTO_UDPLITE:
450 timeouts = nf_udp_pernet(info->net)->timeouts;
451 break;
452 case IPPROTO_DCCP:
453#ifdef CONFIG_NF_CT_PROTO_DCCP
454 timeouts = nf_dccp_pernet(info->net)->dccp_timeout;
455#endif
456 break;
457 case IPPROTO_ICMPV6:
458 timeouts = &nf_icmpv6_pernet(info->net)->timeout;
459 break;
460 case IPPROTO_SCTP:
461#ifdef CONFIG_NF_CT_PROTO_SCTP
462 timeouts = nf_sctp_pernet(info->net)->timeouts;
463#endif
464 break;
465 case IPPROTO_GRE:
466#ifdef CONFIG_NF_CT_PROTO_GRE
467 timeouts = nf_gre_pernet(info->net)->timeouts;
468#endif
469 break;
470 case 255:
471 timeouts = &nf_generic_pernet(info->net)->timeout;
472 break;
473 default:
474 WARN_ONCE(1, "Missing timeouts for proto %d", l4proto->l4proto);
475 break;
476 }
477
478 if (!timeouts)
479 return -EOPNOTSUPP;
480
481 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
482 if (!skb2)
483 return -ENOMEM;
484
485 ret = cttimeout_default_fill_info(info->net, skb2,
486 NETLINK_CB(skb).portid,
487 info->nlh->nlmsg_seq,
488 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
489 IPCTNL_MSG_TIMEOUT_DEFAULT_SET,
490 l3num, l4proto, timeouts);
491 if (ret <= 0) {
492 kfree_skb(skb2);
493 return -ENOMEM;
494 }
495
496 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
497}
498
499static struct nf_ct_timeout *ctnl_timeout_find_get(struct net *net,
500 const char *name)
501{
502 struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(net);
503 struct ctnl_timeout *timeout, *matching = NULL;
504
505 list_for_each_entry_rcu(timeout, &pernet->nfct_timeout_list, head) {
506 if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
507 continue;
508
509 if (!try_module_get(THIS_MODULE))
510 goto err;
511
512 if (!refcount_inc_not_zero(&timeout->refcnt)) {
513 module_put(THIS_MODULE);
514 goto err;
515 }
516 matching = timeout;
517 break;
518 }
519err:
520 return matching ? &matching->timeout : NULL;
521}
522
523static void ctnl_timeout_put(struct nf_ct_timeout *t)
524{
525 struct ctnl_timeout *timeout =
526 container_of(t, struct ctnl_timeout, timeout);
527
528 if (refcount_dec_and_test(&timeout->refcnt))
529 kfree_rcu(timeout, rcu_head);
530
531 module_put(THIS_MODULE);
532}
533
534static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = {
535 [IPCTNL_MSG_TIMEOUT_NEW] = {
536 .call = cttimeout_new_timeout,
537 .type = NFNL_CB_MUTEX,
538 .attr_count = CTA_TIMEOUT_MAX,
539 .policy = cttimeout_nla_policy
540 },
541 [IPCTNL_MSG_TIMEOUT_GET] = {
542 .call = cttimeout_get_timeout,
543 .type = NFNL_CB_MUTEX,
544 .attr_count = CTA_TIMEOUT_MAX,
545 .policy = cttimeout_nla_policy
546 },
547 [IPCTNL_MSG_TIMEOUT_DELETE] = {
548 .call = cttimeout_del_timeout,
549 .type = NFNL_CB_MUTEX,
550 .attr_count = CTA_TIMEOUT_MAX,
551 .policy = cttimeout_nla_policy
552 },
553 [IPCTNL_MSG_TIMEOUT_DEFAULT_SET] = {
554 .call = cttimeout_default_set,
555 .type = NFNL_CB_MUTEX,
556 .attr_count = CTA_TIMEOUT_MAX,
557 .policy = cttimeout_nla_policy
558 },
559 [IPCTNL_MSG_TIMEOUT_DEFAULT_GET] = {
560 .call = cttimeout_default_get,
561 .type = NFNL_CB_MUTEX,
562 .attr_count = CTA_TIMEOUT_MAX,
563 .policy = cttimeout_nla_policy
564 },
565};
566
567static const struct nfnetlink_subsystem cttimeout_subsys = {
568 .name = "conntrack_timeout",
569 .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT,
570 .cb_count = IPCTNL_MSG_TIMEOUT_MAX,
571 .cb = cttimeout_cb,
572};
573
574MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT);
575
576static int __net_init cttimeout_net_init(struct net *net)
577{
578 struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(net);
579
580 INIT_LIST_HEAD(&pernet->nfct_timeout_list);
581
582 return 0;
583}
584
585static void __net_exit cttimeout_net_exit(struct net *net)
586{
587 struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(net);
588 struct ctnl_timeout *cur, *tmp;
589
590 nf_ct_unconfirmed_destroy(net);
591 nf_ct_untimeout(net, NULL);
592
593 list_for_each_entry_safe(cur, tmp, &pernet->nfct_timeout_list, head) {
594 list_del_rcu(&cur->head);
595
596 if (refcount_dec_and_test(&cur->refcnt))
597 kfree_rcu(cur, rcu_head);
598 }
599}
600
601static struct pernet_operations cttimeout_ops = {
602 .init = cttimeout_net_init,
603 .exit = cttimeout_net_exit,
604 .id = &nfct_timeout_id,
605 .size = sizeof(struct nfct_timeout_pernet),
606};
607
608static int __init cttimeout_init(void)
609{
610 int ret;
611
612 ret = register_pernet_subsys(&cttimeout_ops);
613 if (ret < 0)
614 return ret;
615
616 ret = nfnetlink_subsys_register(&cttimeout_subsys);
617 if (ret < 0) {
618 pr_err("cttimeout_init: cannot register cttimeout with "
619 "nfnetlink.\n");
620 goto err_out;
621 }
622 RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get);
623 RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put);
624 return 0;
625
626err_out:
627 unregister_pernet_subsys(&cttimeout_ops);
628 return ret;
629}
630
631static void __exit cttimeout_exit(void)
632{
633 nfnetlink_subsys_unregister(&cttimeout_subsys);
634
635 unregister_pernet_subsys(&cttimeout_ops);
636 RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL);
637 RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL);
638 synchronize_rcu();
639}
640
641module_init(cttimeout_init);
642module_exit(cttimeout_exit);
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
37MODULE_LICENSE("GPL");
38MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
39MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tuning");
40
41static LIST_HEAD(cttimeout_list);
42
43static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = {
44 [CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING },
45 [CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 },
46 [CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 },
47 [CTA_TIMEOUT_DATA] = { .type = NLA_NESTED },
48};
49
50static int
51ctnl_timeout_parse_policy(struct ctnl_timeout *timeout,
52 struct nf_conntrack_l4proto *l4proto,
53 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 nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max,
61 attr, l4proto->ctnl_timeout.nla_policy);
62
63 ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, &timeout->data);
64 }
65 return ret;
66}
67
68static int
69cttimeout_new_timeout(struct sock *ctnl, struct sk_buff *skb,
70 const struct nlmsghdr *nlh,
71 const struct nlattr * const cda[])
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
90 list_for_each_entry(timeout, &cttimeout_list, head) {
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
101 l4proto = nf_ct_l4proto_find_get(l3num, l4num);
102
103 /* This protocol is not supportted, skip. */
104 if (l4proto->l4proto != l4num) {
105 ret = -EOPNOTSUPP;
106 goto err_proto_put;
107 }
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 ||
115 matching->l4proto->l4proto != l4num) {
116 ret = -EINVAL;
117 goto err_proto_put;
118 }
119
120 ret = ctnl_timeout_parse_policy(matching, l4proto,
121 cda[CTA_TIMEOUT_DATA]);
122 return ret;
123 }
124 ret = -EBUSY;
125 goto err_proto_put;
126 }
127
128 timeout = kzalloc(sizeof(struct ctnl_timeout) +
129 l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
130 if (timeout == NULL) {
131 ret = -ENOMEM;
132 goto err_proto_put;
133 }
134
135 ret = ctnl_timeout_parse_policy(timeout, l4proto,
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;
142 timeout->l4proto = l4proto;
143 atomic_set(&timeout->refcnt, 1);
144 list_add_tail_rcu(&timeout->head, &cttimeout_list);
145
146 return 0;
147err:
148 kfree(timeout);
149err_proto_put:
150 nf_ct_l4proto_put(l4proto);
151 return ret;
152}
153
154static int
155ctnl_timeout_fill_info(struct sk_buff *skb, u32 pid, u32 seq, u32 type,
156 int event, struct ctnl_timeout *timeout)
157{
158 struct nlmsghdr *nlh;
159 struct nfgenmsg *nfmsg;
160 unsigned int flags = pid ? NLM_F_MULTI : 0;
161 struct nf_conntrack_l4proto *l4proto = timeout->l4proto;
162
163 event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8;
164 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
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
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,
177 htonl(atomic_read(&timeout->refcnt))))
178 goto nla_put_failure;
179
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 }
195
196 nlmsg_end(skb, nlh);
197 return skb->len;
198
199nlmsg_failure:
200nla_put_failure:
201 nlmsg_cancel(skb, nlh);
202 return -1;
203}
204
205static int
206ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb)
207{
208 struct ctnl_timeout *cur, *last;
209
210 if (cb->args[2])
211 return 0;
212
213 last = (struct ctnl_timeout *)cb->args[1];
214 if (cb->args[1])
215 cb->args[1] = 0;
216
217 rcu_read_lock();
218 list_for_each_entry_rcu(cur, &cttimeout_list, head) {
219 if (last && cur != last)
220 continue;
221
222 if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).pid,
223 cb->nlh->nlmsg_seq,
224 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
225 IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) {
226 cb->args[1] = (unsigned long)cur;
227 break;
228 }
229 }
230 if (!cb->args[1])
231 cb->args[2] = 1;
232 rcu_read_unlock();
233 return skb->len;
234}
235
236static int
237cttimeout_get_timeout(struct sock *ctnl, struct sk_buff *skb,
238 const struct nlmsghdr *nlh,
239 const struct nlattr * const cda[])
240{
241 int ret = -ENOENT;
242 char *name;
243 struct ctnl_timeout *cur;
244
245 if (nlh->nlmsg_flags & NLM_F_DUMP) {
246 struct netlink_dump_control c = {
247 .dump = ctnl_timeout_dump,
248 };
249 return netlink_dump_start(ctnl, skb, nlh, &c);
250 }
251
252 if (!cda[CTA_TIMEOUT_NAME])
253 return -EINVAL;
254 name = nla_data(cda[CTA_TIMEOUT_NAME]);
255
256 list_for_each_entry(cur, &cttimeout_list, head) {
257 struct sk_buff *skb2;
258
259 if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
260 continue;
261
262 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
263 if (skb2 == NULL) {
264 ret = -ENOMEM;
265 break;
266 }
267
268 ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).pid,
269 nlh->nlmsg_seq,
270 NFNL_MSG_TYPE(nlh->nlmsg_type),
271 IPCTNL_MSG_TIMEOUT_NEW, cur);
272 if (ret <= 0) {
273 kfree_skb(skb2);
274 break;
275 }
276 ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid,
277 MSG_DONTWAIT);
278 if (ret > 0)
279 ret = 0;
280
281 /* this avoids a loop in nfnetlink. */
282 return ret == -EAGAIN ? -ENOBUFS : ret;
283 }
284 return ret;
285}
286
287/* try to delete object, fail if it is still in use. */
288static int ctnl_timeout_try_del(struct ctnl_timeout *timeout)
289{
290 int ret = 0;
291
292 /* we want to avoid races with nf_ct_timeout_find_get. */
293 if (atomic_dec_and_test(&timeout->refcnt)) {
294 /* We are protected by nfnl mutex. */
295 list_del_rcu(&timeout->head);
296 nf_ct_l4proto_put(timeout->l4proto);
297 kfree_rcu(timeout, rcu_head);
298 } else {
299 /* still in use, restore reference counter. */
300 atomic_inc(&timeout->refcnt);
301 ret = -EBUSY;
302 }
303 return ret;
304}
305
306static int
307cttimeout_del_timeout(struct sock *ctnl, struct sk_buff *skb,
308 const struct nlmsghdr *nlh,
309 const struct nlattr * const cda[])
310{
311 char *name;
312 struct ctnl_timeout *cur;
313 int ret = -ENOENT;
314
315 if (!cda[CTA_TIMEOUT_NAME]) {
316 list_for_each_entry(cur, &cttimeout_list, head)
317 ctnl_timeout_try_del(cur);
318
319 return 0;
320 }
321 name = nla_data(cda[CTA_TIMEOUT_NAME]);
322
323 list_for_each_entry(cur, &cttimeout_list, head) {
324 if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
325 continue;
326
327 ret = ctnl_timeout_try_del(cur);
328 if (ret < 0)
329 return ret;
330
331 break;
332 }
333 return ret;
334}
335
336#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
337static struct ctnl_timeout *ctnl_timeout_find_get(const char *name)
338{
339 struct ctnl_timeout *timeout, *matching = NULL;
340
341 rcu_read_lock();
342 list_for_each_entry_rcu(timeout, &cttimeout_list, head) {
343 if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
344 continue;
345
346 if (!try_module_get(THIS_MODULE))
347 goto err;
348
349 if (!atomic_inc_not_zero(&timeout->refcnt)) {
350 module_put(THIS_MODULE);
351 goto err;
352 }
353 matching = timeout;
354 break;
355 }
356err:
357 rcu_read_unlock();
358 return matching;
359}
360
361static void ctnl_timeout_put(struct ctnl_timeout *timeout)
362{
363 atomic_dec(&timeout->refcnt);
364 module_put(THIS_MODULE);
365}
366#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
367
368static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = {
369 [IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout,
370 .attr_count = CTA_TIMEOUT_MAX,
371 .policy = cttimeout_nla_policy },
372 [IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout,
373 .attr_count = CTA_TIMEOUT_MAX,
374 .policy = cttimeout_nla_policy },
375 [IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout,
376 .attr_count = CTA_TIMEOUT_MAX,
377 .policy = cttimeout_nla_policy },
378};
379
380static const struct nfnetlink_subsystem cttimeout_subsys = {
381 .name = "conntrack_timeout",
382 .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT,
383 .cb_count = IPCTNL_MSG_TIMEOUT_MAX,
384 .cb = cttimeout_cb,
385};
386
387MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT);
388
389static int __init cttimeout_init(void)
390{
391 int ret;
392
393 ret = nfnetlink_subsys_register(&cttimeout_subsys);
394 if (ret < 0) {
395 pr_err("cttimeout_init: cannot register cttimeout with "
396 "nfnetlink.\n");
397 goto err_out;
398 }
399#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
400 RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get);
401 RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put);
402#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
403 return 0;
404
405err_out:
406 return ret;
407}
408
409static void __exit cttimeout_exit(void)
410{
411 struct ctnl_timeout *cur, *tmp;
412
413 pr_info("cttimeout: unregistering from nfnetlink.\n");
414
415 nfnetlink_subsys_unregister(&cttimeout_subsys);
416 list_for_each_entry_safe(cur, tmp, &cttimeout_list, head) {
417 list_del_rcu(&cur->head);
418 /* We are sure that our objects have no clients at this point,
419 * it's safe to release them all without checking refcnt.
420 */
421 nf_ct_l4proto_put(cur->l4proto);
422 kfree_rcu(cur, rcu_head);
423 }
424#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
425 RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL);
426 RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL);
427#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
428}
429
430module_init(cttimeout_init);
431module_exit(cttimeout_exit);