LB_IOC
#define LB_GET_INFO_SIZE (LB_IOC|0) /* Get size of loopback info */
#define LB_GET_INFO (LB_IOC|1) /* Get loopback info table */
#define LB_GET_MODE (LB_IOC|2) /* Get current loopback mode */
#define LB_SET_MODE (LB_IOC|3) /* Set current loopback mode */