LXR linux/drivers/net/slip/slip.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * slip.h       Define the SLIP device driver interface and constants.
   4 *
   5 * NOTE:        THIS FILE WILL BE MOVED TO THE LINUX INCLUDE DIRECTORY
   6 *              AS SOON AS POSSIBLE!
   7 *
   8 * Version:     @(#)slip.h      1.2.0   03/28/93
   9 *
  10 * Fixes:
  11 *              Alan Cox        :       Added slip mtu field.
  12 *              Matt Dillon     :       Printable slip (borrowed from net2e)
  13 *              Alan Cox        :       Added SL_SLIP_LOTS
  14 *      Dmitry Gorodchanin      :       A lot of changes in the 'struct slip'
  15 *      Dmitry Gorodchanin      :       Added CSLIP statistics.
  16 *      Stanislav Voronyi       :       Make line checking as created by
  17 *                                      Igor Chechik, RELCOM Corp.
  18 *      Craig Schlenter         :       Fixed #define bug that caused
  19 *                                      CSLIP telnets to hang in 1.3.61-6
  20 *
  21 * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  22 */
  23#ifndef _LINUX_SLIP_H
  24#define _LINUX_SLIP_H
  25
  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
  50struct slip {
  51  int                   magic;
  52
  53  /* Various fields. */
  54  struct tty_struct     *tty;           /* ptr to TTY structure         */
  55  struct net_device     *dev;           /* easy for intr handling       */
  56  spinlock_t            lock;
  57  struct work_struct    tx_work;        /* Flushes transmit buffer      */
  58
  59#ifdef SL_INCLUDE_CSLIP
  60  struct slcompress     *slcomp;        /* for header compression       */
  61  unsigned char         *cbuff;         /* compression buffer           */
  62#endif
  63
  64  /* These are pointers to the malloc()ed frame buffers. */
  65  unsigned char         *rbuff;         /* receiver buffer              */
  66  int                   rcount;         /* received chars counter       */
  67  unsigned char         *xbuff;         /* transmitter buffer           */
  68  unsigned char         *xhead;         /* pointer to next byte to XMIT */
  69  int                   xleft;          /* bytes left in XMIT queue     */
  70  int                   mtu;            /* Our mtu (to spot changes!)   */
  71  int                   buffsize;       /* Max buffers sizes            */
  72
  73#ifdef CONFIG_SLIP_MODE_SLIP6
  74  int                   xdata, xbits;   /* 6 bit slip controls          */
  75#endif
  76
  77  unsigned long         flags;          /* Flag values/ mode etc        */
  78#define SLF_INUSE       0               /* Channel in use               */
  79#define SLF_ESCAPE      1               /* ESC received                 */
  80#define SLF_ERROR       2               /* Parity, etc. error           */
  81#define SLF_KEEPTEST    3               /* Keepalive test flag          */
  82#define SLF_OUTWAIT     4               /* is outpacket was flag        */
  83
  84  unsigned char         mode;           /* SLIP mode                    */
  85  unsigned char         leased;
  86  pid_t                 pid;
  87#define SL_MODE_SLIP    0
  88#define SL_MODE_CSLIP   1
  89#define SL_MODE_SLIP6   2               /* Matt Dillon's printable slip */
  90#define SL_MODE_CSLIP6  (SL_MODE_SLIP6|SL_MODE_CSLIP)
  91#define SL_MODE_AX25    4
  92#define SL_MODE_ADAPTIVE 8
  93#ifdef CONFIG_SLIP_SMART
  94  unsigned char         outfill;        /* # of sec between outfill packet */
  95  unsigned char         keepalive;      /* keepalive seconds            */
  96  struct timer_list     outfill_timer;
  97  struct timer_list     keepalive_timer;
  98#endif
  99};
 100
 101#define SLIP_MAGIC 0x5302
 102
 103#endif  /* _LINUX_SLIP.H */
 104