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  struct work_struct	tx_work;	/* Flushes transmit buffer	*/
57
58#ifdef SL_INCLUDE_CSLIP
59  struct slcompress	*slcomp;	/* for header compression 	*/
60  unsigned char		*cbuff;		/* compression buffer		*/
61#endif
62
63  /* These are pointers to the malloc()ed frame buffers. */
64  unsigned char		*rbuff;		/* receiver buffer		*/
65  int                   rcount;         /* received chars counter       */
66  unsigned char		*xbuff;		/* transmitter buffer		*/
67  unsigned char         *xhead;         /* pointer to next byte to XMIT */
68  int                   xleft;          /* bytes left in XMIT queue     */
69  int			mtu;		/* Our mtu (to spot changes!)   */
70  int                   buffsize;       /* Max buffers sizes            */
71
72#ifdef CONFIG_SLIP_MODE_SLIP6
73  int			xdata, xbits;	/* 6 bit slip controls 		*/
74#endif
75
76  unsigned long		flags;		/* Flag values/ mode etc	*/
77#define SLF_INUSE	0		/* Channel in use               */
78#define SLF_ESCAPE	1               /* ESC received                 */
79#define SLF_ERROR	2               /* Parity, etc. error           */
80#define SLF_KEEPTEST	3		/* Keepalive test flag		*/
81#define SLF_OUTWAIT	4		/* is outpacket was flag	*/
82
83  unsigned char		mode;		/* SLIP mode			*/
84  unsigned char		leased;
85  pid_t			pid;
86#define SL_MODE_SLIP	0
87#define SL_MODE_CSLIP	1
88#define SL_MODE_SLIP6	2		/* Matt Dillon's printable slip */
89#define SL_MODE_CSLIP6	(SL_MODE_SLIP6|SL_MODE_CSLIP)
90#define SL_MODE_AX25	4
91#define SL_MODE_ADAPTIVE 8
92#ifdef CONFIG_SLIP_SMART
93  unsigned char		outfill;	/* # of sec between outfill packet */
94  unsigned char		keepalive;	/* keepalive seconds		*/
95  struct timer_list	outfill_timer;
96  struct timer_list	keepalive_timer;
97#endif
98};
99
100#define SLIP_MAGIC 0x5302
101
102#endif	/* _LINUX_SLIP.H */
103