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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 DIRECTORY6 * AS SOON AS POSSIBLE!7 *8 * Version: @(#)slip.h 1.2.0 03/28/939 *10 * Fixes:11 * Alan Cox : Added slip mtu field.12 * Matt Dillon : Printable slip (borrowed from net2e)13 * Alan Cox : Added SL_SLIP_LOTS14 * Dmitry Gorodchanin : A lot of changes in the 'struct slip'15 * Dmitry Gorodchanin : Added CSLIP statistics.16 * Stanislav Voronyi : Make line checking as created by17 * Igor Chechik, RELCOM Corp.18 * Craig Schlenter : Fixed #define bug that caused19 * CSLIP telnets to hang in 1.3.61-620 *21 * Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>22 */23#ifndef _LINUX_SLIP_H24#define _LINUX_SLIP_H25 26 27#if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED)28# define SL_INCLUDE_CSLIP29#endif30 31#ifdef SL_INCLUDE_CSLIP32# define SL_MODE_DEFAULT SL_MODE_ADAPTIVE33#else34# define SL_MODE_DEFAULT SL_MODE_SLIP35#endif36 37/* SLIP configuration. */38#define SL_NRUNIT 256 /* MAX number of SLIP channels;39 This can be overridden with40 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 END45/* 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_CSLIP62 struct slcompress *slcomp; /* for header compression */63 unsigned char *cbuff; /* compression buffer */64#endif65 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_SLIP676 int xdata, xbits; /* 6 bit slip controls */77#endif78 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 090#define SL_MODE_CSLIP 191#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 494#define SL_MODE_ADAPTIVE 895#ifdef CONFIG_SLIP_SMART96 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#endif101};102 103#define SLIP_MAGIC 0x5302104 105#endif /* _LINUX_SLIP.H */106