[IPV6]: Unify ip6_onlink() and ipip6_onlink().
Both are identical, let's create ipv6_chk_prefix() and use it
in both places.
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index d89b0bc..bdcc863 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -71,6 +71,10 @@
extern int ipv6_chk_home_addr(struct net *net,
struct in6_addr *addr);
#endif
+
+extern int ipv6_chk_prefix(struct in6_addr *addr,
+ struct net_device *dev);
+
extern struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
struct in6_addr *addr,
struct net_device *dev,
