[ICMP6]: Introduce icmp6_hdr()

For consistency with all the other skb->h.raw accessors.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/icmpv6.h b/include/linux/icmpv6.h
index 68d3526..0b5ba5e 100644
--- a/include/linux/icmpv6.h
+++ b/include/linux/icmpv6.h
@@ -75,6 +75,15 @@
 #define icmp6_router_pref	icmp6_dataun.u_nd_ra.router_pref
 };
 
+#ifdef __KERNEL__
+#include <linux/skbuff.h>
+
+static inline struct icmp6hdr *icmp6_hdr(const struct sk_buff *skb)
+{
+	return (struct icmp6hdr *)skb->h.raw;
+}
+#endif
+
 #define ICMPV6_ROUTER_PREF_LOW		0x3
 #define ICMPV6_ROUTER_PREF_MEDIUM	0x0
 #define ICMPV6_ROUTER_PREF_HIGH		0x1