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 
10 #include <linux/types.h>
11 #include <linux/netfilter.h>
12 #include <linux/skbuff.h>
13 #include <linux/vmalloc.h>
14 #include <linux/stddef.h>
15 #include <linux/err.h>
16 #include <linux/percpu.h>
17 #include <linux/kernel.h>
18 #include <linux/netdevice.h>
19 #include <linux/slab.h>
20 #include <linux/export.h>
21 
22 #include <net/netfilter/nf_conntrack.h>
23 #include <net/netfilter/nf_conntrack_core.h>
24 #include <net/netfilter/nf_conntrack_extend.h>
25 #include <net/netfilter/nf_conntrack_timeout.h>
26 
27 struct nf_ct_timeout *
28 (*nf_ct_timeout_find_get_hook)(struct net *net, const char *name) __read_mostly;
29 EXPORT_SYMBOL_GPL(nf_ct_timeout_find_get_hook);
30 
31 void (*nf_ct_timeout_put_hook)(struct nf_ct_timeout *timeout) __read_mostly;
32 EXPORT_SYMBOL_GPL(nf_ct_timeout_put_hook);
33 
34 static int untimeout(struct nf_conn *ct, void *timeout)
35 {
36 	struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct);
37 
38 	if (timeout_ext && (!timeout || timeout_ext->timeout == timeout))
39 		RCU_INIT_POINTER(timeout_ext->timeout, NULL);
40 
41 	/* We are not intended to delete this conntrack. */
42 	return 0;
43 }
44 
45 void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout)
46 {
47 	nf_ct_iterate_cleanup_net(net, untimeout, timeout, 0, 0);
48 }
49 EXPORT_SYMBOL_GPL(nf_ct_untimeout);
50 
51 static const struct nf_ct_ext_type timeout_extend = {
52 	.len	= sizeof(struct nf_conn_timeout),
53 	.align	= __alignof__(struct nf_conn_timeout),
54 	.id	= NF_CT_EXT_TIMEOUT,
55 };
56 
57 int nf_conntrack_timeout_init(void)
58 {
59 	int ret = nf_ct_extend_register(&timeout_extend);
60 	if (ret < 0)
61 		pr_err("nf_ct_timeout: Unable to register timeout extension.\n");
62 	return ret;
63 }
64 
65 void nf_conntrack_timeout_fini(void)
66 {
67 	nf_ct_extend_unregister(&timeout_extend);
68 }
69