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(tmpl: &fib4_notifier_ops_template, net); |
62 | if (IS_ERR(ptr: ops)) |
63 | return PTR_ERR(ptr: 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(ops: net->ipv4.notifier_ops); |
72 | } |
73 | |