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/netns/ipv4.h>
10#include <net/ip_fib.h>
11
12int call_fib4_notifier(struct notifier_block *nb,
13		       enum fib_event_type event_type,
14		       struct fib_notifier_info *info)
15{
16	info->family = AF_INET;
17	return call_fib_notifier(nb, event_type, info);
18}
19
20int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
21			struct fib_notifier_info *info)
22{
23	ASSERT_RTNL();
24
25	info->family = AF_INET;
26	net->ipv4.fib_seq++;
27	return call_fib_notifiers(net, event_type, info);
28}
29
30static unsigned int fib4_seq_read(struct net *net)
31{
32	ASSERT_RTNL();
33
34	return net->ipv4.fib_seq + fib4_rules_seq_read(net);
35}
36
37static int fib4_dump(struct net *net, struct notifier_block *nb,
38		     struct netlink_ext_ack *extack)
39{
40	int err;
41
42	err = fib4_rules_dump(net, nb, extack);
43	if (err)
44		return err;
45
46	return fib_notify(net, nb, extack);
47}
48
49static const struct fib_notifier_ops fib4_notifier_ops_template = {
50	.family		= AF_INET,
51	.fib_seq_read	= fib4_seq_read,
52	.fib_dump	= fib4_dump,
53	.owner		= THIS_MODULE,
54};
55
56int __net_init fib4_notifier_init(struct net *net)
57{
58	struct fib_notifier_ops *ops;
59
60	net->ipv4.fib_seq = 0;
61
62	ops = fib_notifier_ops_register(&fib4_notifier_ops_template, net);
63	if (IS_ERR(ops))
64		return PTR_ERR(ops);
65	net->ipv4.notifier_ops = ops;
66
67	return 0;
68}
69
70void __net_exit fib4_notifier_exit(struct net *net)
71{
72	fib_notifier_ops_unregister(net->ipv4.notifier_ops);
73}
74