nf_conntrack_proto_generic.c

 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
13static 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
20static 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
40static int
41generic_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
50nla_put_failure:
51        return -ENOSPC;
52}
53
54static const struct nla_policy
55generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
56	[CTA_TIMEOUT_GENERIC_TIMEOUT]	= { .type = NLA_U32 },
57};
58#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
59
60void 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
67const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
68{
69	.l4proto		= 255,
70	.allow_clash            = true,
71#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
72	.ctnl_timeout		= {
73		.nlattr_to_obj	= generic_timeout_nlattr_to_obj,
74		.obj_to_nlattr	= generic_timeout_obj_to_nlattr,
75		.nlattr_max	= CTA_TIMEOUT_GENERIC_MAX,
76		.obj_size	= sizeof(unsigned int),
77		.nla_policy	= generic_timeout_nla_policy,
78	},
79#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
80};