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/* SPDX-License-Identifier: GPL-2.0 */
/*
* slip.h Define the SLIP device driver interface and constants.
*
* NOTE: THIS FILE WILL BE MOVED TO THE LINUX INCLUDE DIRECTORY
* AS SOON AS POSSIBLE!
*
* Version: @(#)slip.h 1.2.0 03/28/93
*
* Fixes:
* Alan Cox : Added slip mtu field.
* Matt Dillon : Printable slip (borrowed from net2e)
* Alan Cox : Added SL_SLIP_LOTS
* Dmitry Gorodchanin : A lot of changes in the 'struct slip'
* Dmitry Gorodchanin : Added CSLIP statistics.
* Stanislav Voronyi : Make line checking as created by
* Igor Chechik, RELCOM Corp.
* Craig Schlenter : Fixed #define bug that caused
* CSLIP telnets to hang in 1.3.61-6
*
* Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
*/
#ifndef _LINUX_SLIP_H
#define _LINUX_SLIP_H
#if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED)
# define SL_INCLUDE_CSLIP
#endif
#ifdef SL_INCLUDE_CSLIP
# define SL_MODE_DEFAULT SL_MODE_ADAPTIVE
#else
# define SL_MODE_DEFAULT SL_MODE_SLIP
#endif
/* SLIP configuration. */
#define SL_NRUNIT 256 /* MAX number of SLIP channels;
This can be overridden with
insmod -oslip_maxdev=nnn */
#define SL_MTU 296 /* 296; I am used to 600- FvK */
/* some arch define END as assembly function ending, just undef it */
#undef END
/* SLIP protocol characters. */
#define END 0300 /* indicates end of frame */
#define ESC 0333 /* indicates byte stuffing */
#define ESC_END 0334 /* ESC ESC_END means END 'data' */
#define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */
struct slip {
int magic;
/* Various fields. */
struct tty_struct *tty; /* ptr to TTY structure */
struct net_device *dev; /* easy for intr handling */
spinlock_t lock;
struct work_struct tx_work; /* Flushes transmit buffer */
#ifdef SL_INCLUDE_CSLIP
struct slcompress *slcomp; /* for header compression */
unsigned char *cbuff; /* compression buffer */
#endif
/* These are pointers to the malloc()ed frame buffers. */
unsigned char *rbuff; /* receiver buffer */
int rcount; /* received chars counter */
unsigned char *xbuff; /* transmitter buffer */
unsigned char *xhead; /* pointer to next byte to XMIT */
int xleft; /* bytes left in XMIT queue */
int mtu; /* Our mtu (to spot changes!) */
int buffsize; /* Max buffers sizes */
#ifdef CONFIG_SLIP_MODE_SLIP6
int xdata, xbits; /* 6 bit slip controls */
#endif
unsigned long flags; /* Flag values/ mode etc */
#define SLF_INUSE 0 /* Channel in use */
#define SLF_ESCAPE 1 /* ESC received */
#define SLF_ERROR 2 /* Parity, etc. error */
#define SLF_KEEPTEST 3 /* Keepalive test flag */
#define SLF_OUTWAIT 4 /* is outpacket was flag */
unsigned char mode; /* SLIP mode */
unsigned char leased;
pid_t pid;
#define SL_MODE_SLIP 0
#define SL_MODE_CSLIP 1
#define SL_MODE_SLIP6 2 /* Matt Dillon's printable slip */
#define SL_MODE_CSLIP6 (SL_MODE_SLIP6|SL_MODE_CSLIP)
#define SL_MODE_AX25 4
#define SL_MODE_ADAPTIVE 8
#ifdef CONFIG_SLIP_SMART
unsigned char outfill; /* # of sec between outfill packet */
unsigned char keepalive; /* keepalive seconds */
struct timer_list outfill_timer;
struct timer_list keepalive_timer;
#endif
};
#define SLIP_MAGIC 0x5302
#endif /* _LINUX_SLIP.H */
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