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}

 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
11int 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
19int 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	/* Paired with READ_ONCE() in fib4_seq_read() */
26	WRITE_ONCE(net->ipv4.fib_seq, net->ipv4.fib_seq + 1);
27	return call_fib_notifiers(net, event_type, info);
28}
29
30static unsigned int fib4_seq_read(const struct net *net)
31{
32	/* Paired with WRITE_ONCE() in call_fib4_notifiers() */
33	return READ_ONCE(net->ipv4.fib_seq) + fib4_rules_seq_read(net);
 
34}
35
36static 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
48static 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
55int __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
69void __net_exit fib4_notifier_exit(struct net *net)
70{
71	fib_notifier_ops_unregister(net->ipv4.notifier_ops);
72}