1 // SPDX-License-Identifier: GPL-2.0-only
2 /* (C) 1999-2001 Paul `Rusty' Russell
3  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
4  */
5 
6 #include <linux/types.h>
7 #include <linux/jiffies.h>
8 #include <linux/timer.h>
9 #include <linux/netfilter.h>
10 #include <net/netfilter/nf_conntrack_l4proto.h>
11 #include <net/netfilter/nf_conntrack_timeout.h>
12 
13 static const unsigned int nf_ct_generic_timeout = 600*HZ;
14 
15 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
16 
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nfnetlink_cttimeout.h>
19 
20 static int generic_timeout_nlattr_to_obj(struct nlattr *tb[],
21 					 struct net *net, void *data)
22 {
23 	struct nf_generic_net *gn = nf_generic_pernet(net);
24 	unsigned int *timeout = data;
25 
26 	if (!timeout)
27 		timeout = &gn->timeout;
28 
29 	if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
30 		*timeout =
31 		    ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
32 	else {
33 		/* Set default generic timeout. */
34 		*timeout = gn->timeout;
35 	}
36 
37 	return 0;
38 }
39 
40 static int
41 generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
42 {
43 	const unsigned int *timeout = data;
44 
45 	if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
46 		goto nla_put_failure;
47 
48 	return 0;
49 
50 nla_put_failure:
51         return -ENOSPC;
52 }
53 
54 static const struct nla_policy
55 generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
56 	[CTA_TIMEOUT_GENERIC_TIMEOUT]	= { .type = NLA_U32 },
57 };
58 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
59 
60 void nf_conntrack_generic_init_net(struct net *net)
61 {
62 	struct nf_generic_net *gn = nf_generic_pernet(net);
63 
64 	gn->timeout = nf_ct_generic_timeout;
65 }
66 
67 const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
68 {
69 	.l4proto		= 255,
70 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
71 	.ctnl_timeout		= {
72 		.nlattr_to_obj	= generic_timeout_nlattr_to_obj,
73 		.obj_to_nlattr	= generic_timeout_obj_to_nlattr,
74 		.nlattr_max	= CTA_TIMEOUT_GENERIC_MAX,
75 		.obj_size	= sizeof(unsigned int),
76 		.nla_policy	= generic_timeout_nla_policy,
77 	},
78 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
79 };
80