i386/linux/linux-0.99/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  *
  13  * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  14  */
  15 #ifndef _LINUX_SLIP_H
  16 #define _LINUX_SLIP_H
  17
  18 /* SLIP configuration. */
  19 #define SL_NRUNIT       4               /* number of SLIP channels      */
  20 #define SL_MTU          296             /* 296; I am used to 600- FvK   */
  21
  22 /* SLIP protocol characters. */
  23 #define END             0300            /* indicates end of frame       */
  24 #define ESC             0333            /* indicates byte stuffing      */
  25 #define ESC_END         0334            /* ESC ESC_END means END 'data' */
  26 #define ESC_ESC         0335            /* ESC ESC_ESC means ESC 'data' */
  27
  28
  29 struct slip {
  30   /* Bitmapped flag fields. */
  31   char                  inuse;          /* are we allocated?            */
  32   char                  sending;        /* "channel busy" indicator     */
  33   char                  escape;         /* SLIP state machine           */
  34   char                  unused;         /* fillers                      */
  35
  36   /* Various fields. */
  37   int                   line;           /* SLIP channel number          */
  38   struct tty_struct     *tty;           /* ptr to TTY structure         */
  39   struct device         *dev;           /* easy for intr handling       */
  40   struct slcompress     *slcomp;        /* for header compression       */
  41
  42   /* These are pointers to the malloc()ed frame buffers. */
  43   unsigned char         *rbuff;         /* receiver buffer              */
  44   unsigned char         *xbuff;         /* transmitter buffer           */
  45   unsigned char         *cbuff;         /* compression buffer           */
  46
  47   /* These are the various pointers into the buffers. */
  48   unsigned char         *rhead;         /* RECV buffer pointer (head)   */
  49   unsigned char         *rend;          /* RECV buffer pointer (end)    */
  50   int                   rcount;         /* SLIP receive counter         */
  51
  52   /* SLIP interface statistics. */
  53   unsigned long         rpacket;        /* inbound frame counter        */
  54   unsigned long         roverrun;       /* "buffer overrun" counter     */
  55   unsigned long         spacket;        /* outbound frames counter      */
  56   unsigned long         sbusy;          /* "transmitter busy" counter   */
  57   unsigned long         errors;         /* error count                  */
  58
  59   int                   mtu;            /* Our mtu (to spot changes!)   */
  60   unsigned char         flags;          /* Flag values/ mode etc        */
  61 #define SLF_ESCAPE      2
  62 #define SLF_ERROR       4
  63 #define SLF_COMP        16
  64 #define SLF_EXPN        32
  65   unsigned char         mode;           /* SLIP mode                    */
  66 #define SL_MODE_SLIP    0
  67 #define SL_MODE_CSLIP   1
  68 #define SL_MODE_SLIP6   2               /* Matt Dillon's printable slip */
  69 #define SL_MODE_CSLIP6  (SL_MODE_SLIP6|SL_MODE_CSLIP)
  70 #define SL_MODE_AX25    4
  71 #define SL_MODE_ADAPTIVE 8
  72   int                   xdata,xbits;    /* 6 bit slip controls          */
  73 };
  74
  75
  76 extern int      slip_init(struct device *dev);
  77 extern int      slip_esc(unsigned char *s, unsigned char *d, int len);
  78 extern int      slip_esc6(unsigned char *s, unsigned char *d, int len);
  79 extern void     slip_unesc(struct slip *sl, unsigned char *s, int count, int error);
  80 extern void     slip_unesc6(struct slip *sl, unsigned char *s, int count, int error);
  81
  82
  83 #endif  /* _LINUX_SLIP.H */