void interface_set_down(struct interface *iface);
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);
void interface_add_user(struct interface_user *dep, struct interface *iface);
void interface_remove_user(struct interface_user *dep);
-int interface_remove_link(struct interface *iface, struct device *dev);
int interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext);
void interface_add_error(struct interface *iface, const char *subsystem,