struct netdev;
int netdev_open(const char *name, int ethertype, struct netdev **);
-int netdev_open_tap(const char *name, struct netdev **);
void netdev_close(struct netdev *);
+bool netdev_exists(const char *netdev_name);
+
int netdev_recv(struct netdev *, struct ofpbuf *);
void netdev_recv_wait(struct netdev *);
int netdev_drain(struct netdev *);
int netdev_set_advertisements(struct netdev *, uint32_t advertise);
int netdev_get_in4(const struct netdev *, struct in_addr *);
int netdev_set_in4(struct netdev *, struct in_addr addr, struct in_addr mask);
-int netdev_add_router(struct in_addr router);
+int netdev_add_router(struct netdev *, struct in_addr router);
bool netdev_get_in6(const struct netdev *, struct in6_addr *);
int netdev_get_flags(const struct netdev *, enum netdev_flags *);
int netdev_set_flags(struct netdev *, enum netdev_flags, bool permanent);