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 int mtu; /* Our mtu (to spot changes!) */ 69 int buffsize; /* Max buffers sizes */ 70 71#ifdef CONFIG_SLIP_MODE_SLIP6 72 int xdata, xbits; /* 6 bit slip controls */ 73#endif 74 75 unsigned long flags; /* Flag values/ mode etc */ 76#define SLF_INUSE 0 /* Channel in use */ 77#define SLF_ESCAPE 1 /* ESC received */ 78#define SLF_ERROR 2 /* Parity, etc. error */ 79#define SLF_KEEPTEST 3 /* Keepalive test flag */ 80#define SLF_OUTWAIT 4 /* is outpacket was flag */ 81 82 unsigned char mode; /* SLIP mode */ 83 unsigned char leased; 84 pid_t pid; 85#define SL_MODE_SLIP 0 86#define SL_MODE_CSLIP 1 87#define SL_MODE_SLIP6 2 /* Matt Dillon's printable slip */ 88#define SL_MODE_CSLIP6 (SL_MODE_SLIP6|SL_MODE_CSLIP) 89#define SL_MODE_AX25 4 90#define SL_MODE_ADAPTIVE 8 91#ifdef CONFIG_SLIP_SMART 92 unsigned char outfill; /* # of sec between outfill packet */ 93 unsigned char keepalive; /* keepalive seconds */ 94 struct timer_list outfill_timer; 95 struct timer_list keepalive_timer; 96#endif 97}; 98 99#define SLIP_MAGIC 0x5302 100 101#endif /* _LINUX_SLIP.H */ 102