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/* some arch define END as assembly function ending, just undef it */ 44#undef END 45/* SLIP protocol characters. */ 46#define END 0300 /* indicates end of frame */ 47#define ESC 0333 /* indicates byte stuffing */ 48#define ESC_END 0334 /* ESC ESC_END means END 'data' */ 49#define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */ 50 51 52struct slip { 53 int magic; 54 55 /* Various fields. */ 56 struct tty_struct *tty; /* ptr to TTY structure */ 57 struct net_device *dev; /* easy for intr handling */ 58 spinlock_t lock; 59 struct work_struct tx_work; /* Flushes transmit buffer */ 60 61#ifdef SL_INCLUDE_CSLIP 62 struct slcompress *slcomp; /* for header compression */ 63 unsigned char *cbuff; /* compression buffer */ 64#endif 65 66 /* These are pointers to the malloc()ed frame buffers. */ 67 unsigned char *rbuff; /* receiver buffer */ 68 int rcount; /* received chars counter */ 69 unsigned char *xbuff; /* transmitter buffer */ 70 unsigned char *xhead; /* pointer to next byte to XMIT */ 71 int xleft; /* bytes left in XMIT queue */ 72 int mtu; /* Our mtu (to spot changes!) */ 73 int buffsize; /* Max buffers sizes */ 74 75#ifdef CONFIG_SLIP_MODE_SLIP6 76 int xdata, xbits; /* 6 bit slip controls */ 77#endif 78 79 unsigned long flags; /* Flag values/ mode etc */ 80#define SLF_INUSE 0 /* Channel in use */ 81#define SLF_ESCAPE 1 /* ESC received */ 82#define SLF_ERROR 2 /* Parity, etc. error */ 83#define SLF_KEEPTEST 3 /* Keepalive test flag */ 84#define SLF_OUTWAIT 4 /* is outpacket was flag */ 85 86 unsigned char mode; /* SLIP mode */ 87 unsigned char leased; 88 pid_t pid; 89#define SL_MODE_SLIP 0 90#define SL_MODE_CSLIP 1 91#define SL_MODE_SLIP6 2 /* Matt Dillon's printable slip */ 92#define SL_MODE_CSLIP6 (SL_MODE_SLIP6|SL_MODE_CSLIP) 93#define SL_MODE_AX25 4 94#define SL_MODE_ADAPTIVE 8 95#ifdef CONFIG_SLIP_SMART 96 unsigned char outfill; /* # of sec between outfill packet */ 97 unsigned char keepalive; /* keepalive seconds */ 98 struct timer_list outfill_timer; 99 struct timer_list keepalive_timer; 100#endif 101}; 102 103#define SLIP_MAGIC 0x5302 104 105#endif /* _LINUX_SLIP.H */ 106