CAN_EFF_RTR_FLAGS
*mask &= (CAN_SFF_MASK | CAN_EFF_RTR_FLAGS);
if (((*mask & CAN_EFF_RTR_FLAGS) == CAN_EFF_RTR_FLAGS) &&
if (*mask == (CAN_EFF_MASK | CAN_EFF_RTR_FLAGS))
if (*mask == (CAN_SFF_MASK | CAN_EFF_RTR_FLAGS))