summaryrefslogtreecommitdiffstats
path: root/net/ipv4/fib_notifier.c
blob: b804ccbdb241e6a801ae29cf0664c6a23c0c8d48 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
// SPDX-License-Identifier: GPL-2.0
#include <linux/rtnetlink.h>
#include <linux/notifier.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <net/net_namespace.h>
#include <net/fib_notifier.h>
#include <net/netns/ipv4.h>
#include <net/ip_fib.h>

int call_fib4_notifier(struct notifier_block *nb, struct net *net,
		       enum fib_event_type event_type,
		       struct fib_notifier_info *info)
{
	info->family = AF_INET;
	return call_fib_notifier(nb, net, event_type, info);
}

int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
			struct fib_notifier_info *info)
{
	ASSERT_RTNL();

	info->family = AF_INET;
	net->ipv4.fib_seq++;
	return call_fib_notifiers(net, event_type, info);
}

static unsigned int fib4_seq_read(struct net *net)
{
	ASSERT_RTNL();

	return net->ipv4.fib_seq + fib4_rules_seq_read(net);
}

static int fib4_dump(struct net *net, struct notifier_block *nb)
{
	int err;

	err = fib4_rules_dump(net, nb);
	if (err)
		return err;

	fib_notify(net, nb);

	return 0;
}

static const struct fib_notifier_ops fib4_notifier_ops_template = {
	.family		= AF_INET,
	.fib_seq_read	= fib4_seq_read,
	.fib_dump	= fib4_dump,
	.owner		= THIS_MODULE,
};

int __net_init fib4_notifier_init(struct net *net)
{
	struct fib_notifier_ops *ops;

	net->ipv4.fib_seq = 0;

	ops = fib_notifier_ops_register(&fib4_notifier_ops_template, net);
	if (IS_ERR(ops))
		return PTR_ERR(ops);
	net->ipv4.notifier_ops = ops;

	return 0;
}

void __net_exit fib4_notifier_exit(struct net *net)
{
	fib_notifier_ops_unregister(net->ipv4.notifier_ops);
}