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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, <[email protected]>
- */
- #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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