netfilter: ip6tables: add MASQUERADE target

Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 089a09d..9e63e76 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -78,7 +78,7 @@
 						 int strict);
 
 extern int			ipv6_dev_get_saddr(struct net *net,
-					       struct net_device *dev,
+					       const struct net_device *dev,
 					       const struct in6_addr *daddr,
 					       unsigned int srcprefs,
 					       struct in6_addr *saddr);