int interface_set_up(struct interface *iface);
int interface_set_down(struct interface *iface);
void __interface_set_down(struct interface *iface, bool force);
+int interface_renew(struct interface *iface);
void interface_set_main_dev(struct interface *iface, struct device *dev);
void interface_set_l3_dev(struct interface *iface, struct device *dev);