root/drivers/net/slip.h

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INCLUDED FROM


   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   int                   magic;
  31   /* Bitmapped flag fields. */
  32   char                  inuse;          /* are we allocated?            */
  33   char                  sending;        /* "channel busy" indicator     */
  34   char                  escape;         /* SLIP state machine           */
  35   char                  unused;         /* fillers                      */
  36 
  37   /* Various fields. */
  38   int                   line;           /* SLIP channel number          */
  39   struct tty_struct     *tty;           /* ptr to TTY structure         */
  40   struct device         *dev;           /* easy for intr handling       */
  41   struct slcompress     *slcomp;        /* for header compression       */
  42 
  43   /* These are pointers to the malloc()ed frame buffers. */
  44   unsigned char         *rbuff;         /* receiver buffer              */
  45   unsigned char         *xbuff;         /* transmitter buffer           */
  46   unsigned char         *cbuff;         /* compression buffer           */
  47 
  48   /* These are the various pointers into the buffers. */
  49   unsigned char         *rhead;         /* RECV buffer pointer (head)   */
  50   unsigned char         *rend;          /* RECV buffer pointer (end)    */
  51   int                   rcount;         /* SLIP receive counter         */
  52   unsigned char         *xhead;         /* XMIT buffer pointer (head)   */
  53   unsigned char         *xtail;         /* XMIT buffer pointer (tail)   */
  54 
  55   /* SLIP interface statistics. */
  56   unsigned long         rpacket;        /* inbound frame counter        */
  57   unsigned long         roverrun;       /* "buffer overrun" counter     */
  58   unsigned long         spacket;        /* outbound frames counter      */
  59   unsigned long         sbusy;          /* "transmitter busy" counter   */
  60   unsigned long         errors;         /* error count                  */
  61   
  62   int                   mtu;            /* Our mtu (to spot changes!)   */
  63   unsigned char         flags;          /* Flag values/ mode etc        */
  64 #define SLF_ESCAPE      2
  65 #define SLF_ERROR       4
  66 #define SLF_COMP        16
  67 #define SLF_EXPN        32
  68 #define SLF_XMIT_BUSY   64
  69   unsigned char         mode;           /* SLIP mode                    */
  70 #define SL_MODE_SLIP    0
  71 #define SL_MODE_CSLIP   1
  72 #define SL_MODE_SLIP6   2               /* Matt Dillon's printable slip */
  73 #define SL_MODE_CSLIP6  (SL_MODE_SLIP6|SL_MODE_CSLIP)
  74 #define SL_MODE_AX25    4
  75 #define SL_MODE_ADAPTIVE 8
  76   int                   xdata,xbits;    /* 6 bit slip controls          */
  77 };
  78 
  79 #define SLIP_MAGIC 0x5302
  80 
  81 extern int      slip_init(struct device *dev);
  82 extern int      slip_esc(unsigned char *s, unsigned char *d, int len);
  83 extern int      slip_esc6(unsigned char *s, unsigned char *d, int len);
  84 extern void     slip_unesc(struct slip *sl, unsigned char s);
  85 extern void     slip_unesc6(struct slip *sl, unsigned char s);
  86 
  87 #endif  /* _LINUX_SLIP.H */

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