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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
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. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#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 dev_t line;
94 pid_t pid;
95#define SL_MODE_SLIP 0
96#define SL_MODE_CSLIP 1
97#define SL_MODE_SLIP6 2 /* Matt Dillon's printable slip */
98#define SL_MODE_CSLIP6 (SL_MODE_SLIP6|SL_MODE_CSLIP)
99#define SL_MODE_AX25 4
100#define SL_MODE_ADAPTIVE 8
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400101#ifdef CONFIG_SLIP_SMART
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 unsigned char outfill; /* # of sec between outfill packet */
103 unsigned char keepalive; /* keepalive seconds */
104 struct timer_list outfill_timer;
105 struct timer_list keepalive_timer;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400106#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107};
108
109#define SLIP_MAGIC 0x5302
110
111#endif /* _LINUX_SLIP.H */