root/include/linux/gsmmux.h

#ifndef _LINUX_GSMMUX_H
#define _LINUX_GSMMUX_H

struct gsm_config
{
        unsigned int adaption;
        unsigned int encapsulation;
        unsigned int initiator;
        unsigned int t1;
        unsigned int t2;
        unsigned int t3;
        unsigned int n2;
        unsigned int mru;
        unsigned int mtu;
        unsigned int k;
        unsigned int i;
        unsigned int unused[8];         /* Padding for expansion without
                                           breaking stuff */
};

#define GSMIOC_GETCONF          _IOR('G', 0, struct gsm_config)
#define GSMIOC_SETCONF          _IOW('G', 1, struct gsm_config)

struct gsm_netconfig {
        unsigned int adaption;  /* Adaption to use in network mode */
        unsigned short protocol;/* Protocol to use - only ETH_P_IP supported */
        unsigned short unused2;
        char if_name[IFNAMSIZ]; /* interface name format string */
        __u8 unused[28];        /* For future use */
};

#define GSMIOC_ENABLE_NET      _IOW('G', 2, struct gsm_netconfig)
#define GSMIOC_DISABLE_NET     _IO('G', 3)


#endif