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 #include <linux/config.h>
  26 
  27 #if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED)
  28 # define SL_INCLUDE_CSLIP
  29 #endif
  30 
  31 #ifdef SL_INCLUDE_CSLIP
  32 # define SL_MODE_DEFAULT SL_MODE_ADAPTIVE
  33 #else
  34 # define SL_MODE_DEFAULT SL_MODE_SLIP
  35 #endif
  36 
  37 /* SLIP configuration. */
  38 #define SL_NRUNIT       256             /* MAX number of SLIP channels;
  39                                            This can be overridden with
  40                                            insmod -oslip_maxdev=nnn     */
  41 #define SL_MTU          296             /* 296; I am used to 600- FvK   */
  42 
  43 /* SLIP protocol characters. */
  44 #define END             0300            /* indicates end of frame       */
  45 #define ESC             0333            /* indicates byte stuffing      */
  46 #define ESC_END         0334            /* ESC ESC_END means END 'data' */
  47 #define ESC_ESC         0335            /* ESC ESC_ESC means ESC 'data' */
  48 
  49 
  50 struct slip {
  51   int                   magic;
  52 
  53   /* Various fields. */
  54   struct tty_struct     *tty;           /* ptr to TTY structure         */
  55   struct device         *dev;           /* easy for intr handling       */
  56 #ifdef SL_INCLUDE_CSLIP
  57   struct slcompress     *slcomp;        /* for header compression       */
  58   unsigned char         *cbuff;         /* compression buffer           */
  59 #endif
  60 
  61   /* These are pointers to the malloc()ed frame buffers. */
  62   unsigned char         *rbuff;         /* receiver buffer              */
  63   int                   rcount;         /* received chars counter       */
  64   unsigned char         *xbuff;         /* transmitter buffer           */
  65   unsigned char         *xhead;         /* pointer to next byte to XMIT */
  66   int                   xleft;          /* bytes left in XMIT queue     */
  67 
  68   /* SLIP interface statistics. */
  69   unsigned long         rx_packets;     /* inbound frames counter       */
  70   unsigned long         tx_packets;     /* outbound frames counter      */
  71   unsigned long         rx_errors;      /* Parity, etc. errors          */
  72   unsigned long         tx_errors;      /* Planned stuff                */
  73   unsigned long         rx_dropped;     /* No memory for skb            */
  74   unsigned long         tx_dropped;     /* When MTU change              */
  75   unsigned long         rx_over_errors; /* Frame bigger then SLIP buf.  */
  76 #ifdef SL_INCLUDE_CSLIP
  77   unsigned long         tx_compressed;
  78   unsigned long         rx_compressed;
  79   unsigned long         tx_misses;
  80 #endif
  81   /* Detailed SLIP statistics. */
  82 
  83   int                   mtu;            /* Our mtu (to spot changes!)   */
  84   int                   buffsize;       /* Max buffers sizes            */
  85 
  86 #ifdef CONFIG_SLIP_MODE_SLIP6
  87   int                   xdata, xbits;   /* 6 bit slip controls          */
  88 #endif
  89 
  90   unsigned char         flags;          /* Flag values/ mode etc        */
  91 #define SLF_INUSE       0               /* Channel in use               */
  92 #define SLF_ESCAPE      1               /* ESC received                 */
  93 #define SLF_ERROR       2               /* Parity, etc. error           */
  94 #define SLF_KEEPTEST    3               /* Keepalive test flag          */
  95 #define SLF_OUTWAIT     4               /* is outpacket was flag        */
  96 
  97   unsigned char         mode;           /* SLIP mode                    */
  98 #define SL_MODE_SLIP    0
  99 #define SL_MODE_CSLIP   1
 100 #define SL_MODE_SLIP6   2               /* Matt Dillon's printable slip */
 101 #define SL_MODE_CSLIP6  (SL_MODE_SLIP6|SL_MODE_CSLIP)
 102 #define SL_MODE_AX25    4
 103 #define SL_MODE_ADAPTIVE 8
 104 #ifdef CONFIG_SLIP_SMART  
 105   unsigned char         outfill;        /* # of sec between outfill packet */
 106   unsigned char         keepalive;      /* keepalive seconds            */
 107   struct timer_list     outfill_timer;
 108   struct timer_list     keepalive_timer;
 109 #endif  
 110 };
 111 
 112 
 113 
 114 #define SLIP_MAGIC 0x5302
 115 
 116 extern int slip_init(struct device *dev);
 117 
 118 #endif  /* _LINUX_SLIP.H */
/* */
root/drivers/net/slip.h

INCLUDED FROM
