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