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  *
  16  * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  17  */
  18 #ifndef _LINUX_SLIP_H
  19 #define _LINUX_SLIP_H
  20 
  21 #include <linux/config.h>
  22 
  23 #if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED)
  24 # define SL_INCLUDE_CSLIP
  25 #endif
  26 
  27 #ifdef SL_INCLUDE_CSLIP
  28 # define SL_MODE_DEFAULT SL_MODE_ADAPTIVE
  29 #else
  30 # define SL_MODE_DEFAULT SL_MODE_SLIP
  31 #endif
  32 
  33 /* SLIP configuration. */
  34 #define SL_NRUNIT       256             /* MAX number of SLIP channels;
  35                                            This can be overridden with
  36                                            insmod -oslip_maxdev=nnn     */
  37 #define SL_MTU          296             /* 296; I am used to 600- FvK   */
  38 
  39 /* SLIP protocol characters. */
  40 #define END             0300            /* indicates end of frame       */
  41 #define ESC             0333            /* indicates byte stuffing      */
  42 #define ESC_END         0334            /* ESC ESC_END means END 'data' */
  43 #define ESC_ESC         0335            /* ESC ESC_ESC means ESC 'data' */
  44 
  45 
  46 struct slip {
  47   int                   magic;
  48 
  49   /* Various fields. */
  50   struct tty_struct     *tty;           /* ptr to TTY structure         */
  51   struct device         *dev;           /* easy for intr handling       */
  52 #ifdef SL_INCLUDE_CSLIP
  53   struct slcompress     *slcomp;        /* for header compression       */
  54   unsigned char         *cbuff;         /* compression buffer           */
  55 #endif
  56 
  57   /* These are pointers to the malloc()ed frame buffers. */
  58   unsigned char         *rbuff;         /* receiver buffer              */
  59   int                   rcount;         /* received chars counter       */
  60   unsigned char         *xbuff;         /* transmitter buffer           */
  61   unsigned char         *xhead;         /* pointer to next byte to XMIT */
  62   int                   xleft;          /* bytes left in XMIT queue     */
  63 
  64   /* SLIP interface statistics. */
  65   unsigned long         rx_packets;     /* inbound frames counter       */
  66   unsigned long         tx_packets;     /* outbound frames counter      */
  67   unsigned long         rx_errors;      /* Parity, etc. errors          */
  68   unsigned long         tx_errors;      /* Planned stuff                */
  69   unsigned long         rx_dropped;     /* No memory for skb            */
  70   unsigned long         tx_dropped;     /* When MTU change              */
  71   unsigned long         rx_over_errors; /* Frame bigger then SLIP buf.  */
  72 #ifdef SL_INCLUDE_CSLIP
  73   unsigned long         tx_compressed;
  74   unsigned long         rx_compressed;
  75   unsigned long         tx_misses;
  76 #endif
  77   /* Detailed SLIP statistics. */
  78 
  79   int                   mtu;            /* Our mtu (to spot changes!)   */
  80   int                   buffsize;       /* Max buffers sizes            */
  81 
  82 #ifdef CONFIG_SLIP_MODE_SLIP6
  83   int                   xdata, xbits;   /* 6 bit slip controls          */
  84 #endif
  85 
  86   unsigned char         flags;          /* Flag values/ mode etc        */
  87 #define SLF_INUSE       0               /* Channel in use               */
  88 #define SLF_ESCAPE      1               /* ESC received                 */
  89 #define SLF_ERROR       2               /* Parity, etc. error           */
  90 
  91   unsigned char         mode;           /* SLIP mode                    */
  92 #define SL_MODE_SLIP    0
  93 #define SL_MODE_CSLIP   1
  94 #define SL_MODE_SLIP6   2               /* Matt Dillon's printable slip */
  95 #define SL_MODE_CSLIP6  (SL_MODE_SLIP6|SL_MODE_CSLIP)
  96 #define SL_MODE_AX25    4
  97 #define SL_MODE_ADAPTIVE 8
  98 };
  99 
 100 
 101 
 102 #define SLIP_MAGIC 0x5302
 103 
 104 extern int slip_init(struct device *dev);
 105 
 106 #endif  /* _LINUX_SLIP.H */
/* */
root/drivers/net/slip.h

INCLUDED FROM
