#if defined (USE_SOCKET_SEND) || defined (USE_SOCKET_RECEIVE) \
|| defined (USE_SOCKET_FALLBACK)
int if_register_socket(struct interface_info *, int, int *, struct in6_addr *);
+
+void set_multicast_hop_limit(struct interface_info* info, int hop_limit);
#endif
#if defined (USE_SOCKET_FALLBACK) && !defined (USE_SOCKET_SEND)