1#include <linux/export.h>
2#include <linux/icmpv6.h>
3#include <linux/mutex.h>
4#include <linux/netdevice.h>
5#include <linux/spinlock.h>
6
7#include <net/ipv6.h>
8
9#if IS_ENABLED(CONFIG_IPV6)
10
11static ip6_icmp_send_t __rcu *ip6_icmp_send;
12
13int inet6_register_icmp_sender(ip6_icmp_send_t *fn)
14{
15	return (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, NULL, fn) == NULL) ?
16		0 : -EBUSY;
17}
18EXPORT_SYMBOL(inet6_register_icmp_sender);
19
20int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn)
21{
22	int ret;
23
24	ret = (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, fn, NULL) == fn) ?
25	      0 : -EINVAL;
26
27	synchronize_net();
28
29	return ret;
30}
31EXPORT_SYMBOL(inet6_unregister_icmp_sender);
32
33void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
34{
35	ip6_icmp_send_t *send;
36
37	rcu_read_lock();
38	send = rcu_dereference(ip6_icmp_send);
39
40	if (!send)
41		goto out;
42	send(skb, type, code, info);
43out:
44	rcu_read_unlock();
45}
46EXPORT_SYMBOL(icmpv6_send);
47#endif
48