drivers/net/slip.h

   1 /*
   2  * slip.h       Define the SLIP device driver interface and constants.
   3  *
   4  * NOTE:        THIS FILE WILL BE MOVED TO THE LINUX INCLUDE DIRECTORY
   5  *              AS SOON AS POSSIBLE!
   6  *
   7  * Version:     @(#)slip.h      1.2.0   03/28/93
   8  *
   9  * Fixes:
  10  *              Alan Cox        :       Added slip mtu field.
  11  *              Matt Dillon     :       Printable slip (borrowed from net2e)
  12  *              Alan Cox        :       Added SL_SLIP_LOTS
  13  *      Dmitry Gorodchanin      :       A lot of changes in the 'struct slip'
  14  *      Dmitry Gorodchanin      :       Added CSLIP statistics.
  15  *      Stanislav Voronyi       :       Make line checking as created by
  16  *                                      Igor Chechik, RELCOM Corp.
  17  *      Craig Schlenter         :       Fixed #define bug that caused
  18  *                                      CSLIP telnets to hang in 1.3.61-6
  19  *
  20  * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  21  */
  22 #ifndef _LINUX_SLIP_H
  23 #define _LINUX_SLIP_H
  24
  25
  26 #if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED)
  27 # define SL_INCLUDE_CSLIP
  28 #endif
  29
  30 #ifdef SL_INCLUDE_CSLIP
  31 # define SL_MODE_DEFAULT SL_MODE_ADAPTIVE
  32 #else
  33 # define SL_MODE_DEFAULT SL_MODE_SLIP
  34 #endif
  35
  36 /* SLIP configuration. */
  37 #define SL_NRUNIT       256             /* MAX number of SLIP channels;
  38                                            This can be overridden with
  39                                            insmod -oslip_maxdev=nnn     */
  40 #define SL_MTU          296             /* 296; I am used to 600- FvK   */
  41
  42 /* SLIP protocol characters. */
  43 #define END             0300            /* indicates end of frame       */
  44 #define ESC             0333            /* indicates byte stuffing      */
  45 #define ESC_END         0334            /* ESC ESC_END means END 'data' */
  46 #define ESC_ESC         0335            /* ESC ESC_ESC means ESC 'data' */
  47
  48
  49 struct slip {
  50   int                   magic;
  51
  52   /* Various fields. */
  53   struct tty_struct     *tty;           /* ptr to TTY structure         */
  54   struct net_device     *dev;           /* easy for intr handling       */
  55   spinlock_t            lock;
  56
  57 #ifdef SL_INCLUDE_CSLIP
  58   struct slcompress     *slcomp;        /* for header compression       */
  59   unsigned char         *cbuff;         /* compression buffer           */
  60 #endif
  61
  62   /* These are pointers to the malloc()ed frame buffers. */
  63   unsigned char         *rbuff;         /* receiver buffer              */
  64   int                   rcount;         /* received chars counter       */
  65   unsigned char         *xbuff;         /* transmitter buffer           */
  66   unsigned char         *xhead;         /* pointer to next byte to XMIT */
  67   int                   xleft;          /* bytes left in XMIT queue     */
  68
  69   /* SLIP interface statistics. */
  70 #ifdef SL_INCLUDE_CSLIP
  71   unsigned long         tx_compressed;
  72   unsigned long         rx_compressed;
  73   unsigned long         tx_misses;
  74 #endif
  75   /* Detailed SLIP statistics. */
  76
  77   int                   mtu;            /* Our mtu (to spot changes!)   */
  78   int                   buffsize;       /* Max buffers sizes            */
  79
  80 #ifdef CONFIG_SLIP_MODE_SLIP6
  81   int                   xdata, xbits;   /* 6 bit slip controls          */
  82 #endif
  83
  84   unsigned long         flags;          /* Flag values/ mode etc        */
  85 #define SLF_INUSE       0               /* Channel in use               */
  86 #define SLF_ESCAPE      1               /* ESC received                 */
  87 #define SLF_ERROR       2               /* Parity, etc. error           */
  88 #define SLF_KEEPTEST    3               /* Keepalive test flag          */
  89 #define SLF_OUTWAIT     4               /* is outpacket was flag        */
  90
  91   unsigned char         mode;           /* SLIP mode                    */
  92   unsigned char         leased;
  93   dev_t                 line;
  94   pid_t                 pid;
  95 #define SL_MODE_SLIP    0
  96 #define SL_MODE_CSLIP   1
  97 #define SL_MODE_SLIP6   2               /* Matt Dillon's printable slip */
  98 #define SL_MODE_CSLIP6  (SL_MODE_SLIP6|SL_MODE_CSLIP)
  99 #define SL_MODE_AX25    4
 100 #define SL_MODE_ADAPTIVE 8
 101 #ifdef CONFIG_SLIP_SMART
 102   unsigned char         outfill;        /* # of sec between outfill packet */
 103   unsigned char         keepalive;      /* keepalive seconds            */
 104   struct timer_list     outfill_timer;
 105   struct timer_list     keepalive_timer;
 106 #endif
 107 };
 108
 109 #define SLIP_MAGIC 0x5302
 110
 111 #endif  /* _LINUX_SLIP.H */