#include <linux/export.h>
#include <linux/icmpv6.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>

#include <net/ipv6.h>

#if IS_ENABLED(CONFIG_IPV6)

static ip6_icmp_send_t __rcu *ip6_icmp_send;

int inet6_register_icmp_sender(ip6_icmp_send_t *fn)
{
	return (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, NULL, fn) == NULL) ?
		0 : -EBUSY;
}
EXPORT_SYMBOL(inet6_register_icmp_sender);

int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn)
{
	int ret;

	ret = (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, fn, NULL) == fn) ?
	      0 : -EINVAL;

	synchronize_net();

	return ret;
}
EXPORT_SYMBOL(inet6_unregister_icmp_sender);

void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
{
	ip6_icmp_send_t *send;

	rcu_read_lock();
	send = rcu_dereference(ip6_icmp_send);

	if (!send)
		goto out;
	send(skb, type, code, info, NULL);
out:
	rcu_read_unlock();
}
EXPORT_SYMBOL(icmpv6_send);
#endif
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=6a413e269b170d6d3bd32a71de4d5dcf987d6843'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound?id=6a413e269b170d6d3bd32a71de4d5dcf987d6843'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/usb?id=6a413e269b170d6d3bd32a71de4d5dcf987d6843'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/usb/mixer.c?id=6a413e269b170d6d3bd32a71de4d5dcf987d6843'>mixer.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/sound/usb/mixer.c?id=6a413e269b170d6d3bd32a71de4d5dcf987d6843&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>