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
 26#if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED)
 27# define SL_INCLUDE_CSLIP
 28#endif
 29
 30#ifdef SL_INCLUDE_CSLIP
 31# define SL_MODE_DEFAULT SL_MODE_ADAPTIVE
 32#else
 33# define SL_MODE_DEFAULT SL_MODE_SLIP
 34#endif
 35
 36/* SLIP configuration. */
 37#define SL_NRUNIT	256		/* MAX number of SLIP channels;
 38					   This can be overridden with
 39					   insmod -oslip_maxdev=nnn	*/
 40#define SL_MTU		296		/* 296; I am used to 600- FvK	*/
 41
 42/* SLIP protocol characters. */
 43#define END             0300		/* indicates end of frame	*/
 44#define ESC             0333		/* indicates byte stuffing	*/
 45#define ESC_END         0334		/* ESC ESC_END means END 'data'	*/
 46#define ESC_ESC         0335		/* ESC ESC_ESC means ESC 'data'	*/
 47
 48
 49struct slip {
 50  int			magic;
 51
 52  /* Various fields. */
 53  struct tty_struct	*tty;		/* ptr to TTY structure		*/
 54  struct net_device	*dev;		/* easy for intr handling	*/
 55  spinlock_t		lock;
 56
 57#ifdef SL_INCLUDE_CSLIP
 58  struct slcompress	*slcomp;	/* for header compression 	*/
 59  unsigned char		*cbuff;		/* compression buffer		*/
 60#endif
 61
 62  /* These are pointers to the malloc()ed frame buffers. */
 63  unsigned char		*rbuff;		/* receiver buffer		*/
 64  int                   rcount;         /* received chars counter       */
 65  unsigned char		*xbuff;		/* transmitter buffer		*/
 66  unsigned char         *xhead;         /* pointer to next byte to XMIT */
 67  int                   xleft;          /* bytes left in XMIT queue     */
 68
 69  /* SLIP interface statistics. */
 70#ifdef SL_INCLUDE_CSLIP
 71  unsigned long		tx_compressed;
 72  unsigned long		rx_compressed;
 73  unsigned long		tx_misses;
 74#endif
 75  /* Detailed SLIP statistics. */
 76
 77  int			mtu;		/* Our mtu (to spot changes!)   */
 78  int                   buffsize;       /* Max buffers sizes            */
 79
 80#ifdef CONFIG_SLIP_MODE_SLIP6
 81  int			xdata, xbits;	/* 6 bit slip controls 		*/
 82#endif
 83
 84  unsigned long		flags;		/* Flag values/ mode etc	*/
 85#define SLF_INUSE	0		/* Channel in use               */
 86#define SLF_ESCAPE	1               /* ESC received                 */
 87#define SLF_ERROR	2               /* Parity, etc. error           */
 88#define SLF_KEEPTEST	3		/* Keepalive test flag		*/
 89#define SLF_OUTWAIT	4		/* is outpacket was flag	*/
 90
 91  unsigned char		mode;		/* SLIP mode			*/
 92  unsigned char		leased;
 93  pid_t			pid;
 94#define SL_MODE_SLIP	0
 95#define SL_MODE_CSLIP	1
 96#define SL_MODE_SLIP6	2		/* Matt Dillon's printable slip */
 97#define SL_MODE_CSLIP6	(SL_MODE_SLIP6|SL_MODE_CSLIP)
 98#define SL_MODE_AX25	4
 99#define SL_MODE_ADAPTIVE 8
100#ifdef CONFIG_SLIP_SMART
101  unsigned char		outfill;	/* # of sec between outfill packet */
102  unsigned char		keepalive;	/* keepalive seconds		*/
103  struct timer_list	outfill_timer;
104  struct timer_list	keepalive_timer;
105#endif
106};
107
108#define SLIP_MAGIC 0x5302
109
110#endif	/* _LINUX_SLIP.H */