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, struct net *net,
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, net, 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{
39 int err;
40
41 err = fib4_rules_dump(net, nb);
42 if (err)
43 return err;
44
45 fib_notify(net, nb);
46
47 return 0;
48}
49
50static const struct fib_notifier_ops fib4_notifier_ops_template = {
51 .family = AF_INET,
52 .fib_seq_read = fib4_seq_read,
53 .fib_dump = fib4_dump,
54 .owner = THIS_MODULE,
55};
56
57int __net_init fib4_notifier_init(struct net *net)
58{
59 struct fib_notifier_ops *ops;
60
61 net->ipv4.fib_seq = 0;
62
63 ops = fib_notifier_ops_register(&fib4_notifier_ops_template, net);
64 if (IS_ERR(ops))
65 return PTR_ERR(ops);
66 net->ipv4.notifier_ops = ops;
67
68 return 0;
69}
70
71void __net_exit fib4_notifier_exit(struct net *net)
72{
73 fib_notifier_ops_unregister(net->ipv4.notifier_ops);
74}
75