tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/export.h>
3#include <linux/icmpv6.h>
4#include <linux/mutex.h>
5#include <linux/netdevice.h>
6#include <linux/spinlock.h>
7
8#include <net/ipv6.h>
9
10#if IS_ENABLED(CONFIG_IPV6)
11
12static ip6_icmp_send_t __rcu *ip6_icmp_send;
13
14int inet6_register_icmp_sender(ip6_icmp_send_t *fn)
15{
16 return (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, NULL, fn) == NULL) ?
17 0 : -EBUSY;
18}
19EXPORT_SYMBOL(inet6_register_icmp_sender);
20
21int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn)
22{
23 int ret;
24
25 ret = (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, fn, NULL) == fn) ?
26 0 : -EINVAL;
27
28 synchronize_net();
29
30 return ret;
31}
32EXPORT_SYMBOL(inet6_unregister_icmp_sender);
33
34void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
35{
36 ip6_icmp_send_t *send;
37
38 rcu_read_lock();
39 send = rcu_dereference(ip6_icmp_send);
40
41 if (!send)
42 goto out;
43 send(skb, type, code, info, NULL);
44out:
45 rcu_read_unlock();
46}
47EXPORT_SYMBOL(icmpv6_send);
48#endif