Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv6 / ip6_icmp.c

diff --git a/kernel/net/ipv6/ip6_icmp.c b/kernel/net/ipv6/ip6_icmp.c
new file mode 100644 (file)
index 0000000..14dacc5
--- /dev/null
+++ b/kernel/net/ipv6/ip6_icmp.c
@@ -0,0 +1,47 @@
+#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);
+out:
+       rcu_read_unlock();
+}
+EXPORT_SYMBOL(icmpv6_send);
+#endif