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
11 int 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
19 int 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
29 static 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
36 static 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
48 static 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
55 int __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
69 void __net_exit fib4_notifier_exit(struct net *net)
70 {
71 fib_notifier_ops_unregister(net->ipv4.notifier_ops);
72 }
73
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