ipv6: 64bit version of ipv6_addr_v4mapped().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 2 deletions

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index c5049b019332..77cef3321571 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -487,8 +487,13 @@ static inline bool ipv6_addr_loopback(const struct in6_addr *a)
 
 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
 {
-        return (a->s6_addr32[0] | a->s6_addr32[1] |
-                 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
+        return (
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+                *(__be64 *)a |
+#else
+                (a->s6_addr32[0] | a->s6_addr32[1]) |
+#endif
+                (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
 }
 
 /*