[NETFILTER]: Move ip6_masked_addrcmp to include/net/ipv6.h

Replace netfilter's ip6_masked_addrcmp by a more efficient version
in include/net/ipv6.h to make it usable without module dependencies.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 3b1d963..c893a1c 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -282,6 +282,18 @@ static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr
 	return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
 }
 
+static inline int
+ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
+		     const struct in6_addr *a2)
+{
+	unsigned int i;
+
+	for (i = 0; i < 4; i++)
+		if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
+			return 1;
+	return 0;
+}
+
 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 {
 	memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));