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
11 static ip6_icmp_send_t __rcu *ip6_icmp_send;
12
inet6_register_icmp_sender(ip6_icmp_send_t * fn)13 int 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 }
18 EXPORT_SYMBOL(inet6_register_icmp_sender);
19
inet6_unregister_icmp_sender(ip6_icmp_send_t * fn)20 int 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 }
31 EXPORT_SYMBOL(inet6_unregister_icmp_sender);
32
icmpv6_send(struct sk_buff * skb,u8 type,u8 code,__u32 info)33 void 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, NULL);
43 out:
44 rcu_read_unlock();
45 }
46 EXPORT_SYMBOL(icmpv6_send);
47 #endif
48