19 #define CMTP_MINIMUM_MTU 152 20 #define CMTP_DEFAULT_MTU 672 23 #define CMTPCONNADD _IOW('C', 200, int) 24 #define CMTPCONNDEL _IOW('C', 201, int) 25 #define CMTPGETCONNLIST _IOR('C', 210, int) 26 #define CMTPGETCONNINFO _IOR('C', 211, int) 28 #define CMTP_LOOPBACK 0