1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/rtnetlink.h>
3*4882a593Smuzhiyun #include <linux/notifier.h>
4*4882a593Smuzhiyun #include <linux/socket.h>
5*4882a593Smuzhiyun #include <linux/kernel.h>
6*4882a593Smuzhiyun #include <linux/export.h>
7*4882a593Smuzhiyun #include <net/net_namespace.h>
8*4882a593Smuzhiyun #include <net/fib_notifier.h>
9*4882a593Smuzhiyun #include <net/netns/ipv4.h>
10*4882a593Smuzhiyun #include <net/ip_fib.h>
11*4882a593Smuzhiyun
call_fib4_notifier(struct notifier_block * nb,enum fib_event_type event_type,struct fib_notifier_info * info)12*4882a593Smuzhiyun int call_fib4_notifier(struct notifier_block *nb,
13*4882a593Smuzhiyun enum fib_event_type event_type,
14*4882a593Smuzhiyun struct fib_notifier_info *info)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun info->family = AF_INET;
17*4882a593Smuzhiyun return call_fib_notifier(nb, event_type, info);
18*4882a593Smuzhiyun }
19*4882a593Smuzhiyun
call_fib4_notifiers(struct net * net,enum fib_event_type event_type,struct fib_notifier_info * info)20*4882a593Smuzhiyun int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
21*4882a593Smuzhiyun struct fib_notifier_info *info)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun ASSERT_RTNL();
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun info->family = AF_INET;
26*4882a593Smuzhiyun net->ipv4.fib_seq++;
27*4882a593Smuzhiyun return call_fib_notifiers(net, event_type, info);
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
fib4_seq_read(struct net * net)30*4882a593Smuzhiyun static unsigned int fib4_seq_read(struct net *net)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun ASSERT_RTNL();
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun return net->ipv4.fib_seq + fib4_rules_seq_read(net);
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
fib4_dump(struct net * net,struct notifier_block * nb,struct netlink_ext_ack * extack)37*4882a593Smuzhiyun static int fib4_dump(struct net *net, struct notifier_block *nb,
38*4882a593Smuzhiyun struct netlink_ext_ack *extack)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun int err;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun err = fib4_rules_dump(net, nb, extack);
43*4882a593Smuzhiyun if (err)
44*4882a593Smuzhiyun return err;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun return fib_notify(net, nb, extack);
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun static const struct fib_notifier_ops fib4_notifier_ops_template = {
50*4882a593Smuzhiyun .family = AF_INET,
51*4882a593Smuzhiyun .fib_seq_read = fib4_seq_read,
52*4882a593Smuzhiyun .fib_dump = fib4_dump,
53*4882a593Smuzhiyun .owner = THIS_MODULE,
54*4882a593Smuzhiyun };
55*4882a593Smuzhiyun
fib4_notifier_init(struct net * net)56*4882a593Smuzhiyun int __net_init fib4_notifier_init(struct net *net)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun struct fib_notifier_ops *ops;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun net->ipv4.fib_seq = 0;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun ops = fib_notifier_ops_register(&fib4_notifier_ops_template, net);
63*4882a593Smuzhiyun if (IS_ERR(ops))
64*4882a593Smuzhiyun return PTR_ERR(ops);
65*4882a593Smuzhiyun net->ipv4.notifier_ops = ops;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun return 0;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
fib4_notifier_exit(struct net * net)70*4882a593Smuzhiyun void __net_exit fib4_notifier_exit(struct net *net)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun fib_notifier_ops_unregister(net->ipv4.notifier_ops);
73*4882a593Smuzhiyun }
74