int netdev_add_router(struct netdev *, struct in_addr router);
int netdev_get_next_hop(const struct netdev *, const struct in_addr *host,
struct in_addr *next_hop, char **);
+const char *netdev_get_tnl_iface(const struct netdev *);
int netdev_arp_lookup(const struct netdev *, uint32_t ip, uint8_t mac[6]);
int netdev_get_flags(const struct netdev *, enum netdev_flags *);