1// SPDX-License-Identifier: GPL-2.0
2#include <linux/rtnetlink.h>
3#include <linux/notifier.h>
4#include <linux/socket.h>
5#include <linux/kernel.h>
6#include <linux/export.h>
7#include <net/net_namespace.h>
8#include <net/fib_notifier.h>
9#include <net/ip_fib.h>
10
11int call_fib4_notifier(struct notifier_block *nb,
12		       enum fib_event_type event_type,
13		       struct fib_notifier_info *info)
14{
15	info->family = AF_INET;
16	return call_fib_notifier(nb, event_type, info);
17}
18
19int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
20			struct fib_notifier_info *info)
21{
22	ASSERT_RTNL();
23
24	info->family = AF_INET;
25	net->ipv4.fib_seq++;
26	return call_fib_notifiers(net, event_type, info);
27}
28
29static unsigned int fib4_seq_read(struct net *net)
30{
31	ASSERT_RTNL();
32
33	return net->ipv4.fib_seq + fib4_rules_seq_read(net);
34}
35
36static int fib4_dump(struct net *net, struct notifier_block *nb,
37		     struct netlink_ext_ack *extack)
38{
39	int err;
40
41	err = fib4_rules_dump(net, nb, extack);
42	if (err)
43		return err;
44
45	return fib_notify(net, nb, extack);
46}
47
48static const struct fib_notifier_ops fib4_notifier_ops_template = {
49	.family		= AF_INET,
50	.fib_seq_read	= fib4_seq_read,
51	.fib_dump	= fib4_dump,
52	.owner		= THIS_MODULE,
53};
54
55int __net_init fib4_notifier_init(struct net *net)
56{
57	struct fib_notifier_ops *ops;
58
59	net->ipv4.fib_seq = 0;
60
61	ops = fib_notifier_ops_register(&fib4_notifier_ops_template, net);
62	if (IS_ERR(ops))
63		return PTR_ERR(ops);
64	net->ipv4.notifier_ops = ops;
65
66	return 0;
67}
68
69void __net_exit fib4_notifier_exit(struct net *net)
70{
71	fib_notifier_ops_unregister(net->ipv4.notifier_ops);
72}
73