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/*
* 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)
*
* Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
*/
#ifndef _LINUX_SLIP_H
#define _LINUX_SLIP_H
/* SLIP configuration. */
#define SL_NRUNIT 4 /* number of SLIP channels */
#define SL_MTU 296 /* 296; I am used to 600- FvK */
/* 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 {
/* Bitmapped flag fields. */
char inuse; /* are we allocated? */
char sending; /* "channel busy" indicator */
char escape; /* SLIP state machine */
char unused; /* fillers */
/* Various fields. */
int line; /* SLIP channel number */
struct tty_struct *tty; /* ptr to TTY structure */
struct device *dev; /* easy for intr handling */
struct slcompress *slcomp; /* for header compression */
/* These are pointers to the malloc()ed frame buffers. */
unsigned char *rbuff; /* receiver buffer */
unsigned char *xbuff; /* transmitter buffer */
unsigned char *cbuff; /* compression buffer */
/* These are the various pointers into the buffers. */
unsigned char *rhead; /* RECV buffer pointer (head) */
unsigned char *rend; /* RECV buffer pointer (end) */
int rcount; /* SLIP receive counter */
/* SLIP interface statistics. */
unsigned long rpacket; /* inbound frame counter */
unsigned long roverrun; /* "buffer overrun" counter */
unsigned long spacket; /* outbound frames counter */
unsigned long sbusy; /* "transmitter busy" counter */
unsigned long errors; /* error count */
int mtu; /* Our mtu (to spot changes!) */
unsigned char flags; /* Flag values/ mode etc */
#define SLF_ESCAPE 2
#define SLF_ERROR 4
#define SLF_COMP 16
#define SLF_EXPN 32
unsigned char mode; /* SLIP mode */
#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
int xdata,xbits; /* 6 bit slip controls */
};
extern int slip_init(struct device *dev);
extern int slip_esc(unsigned char *s, unsigned char *d, int len);
extern int slip_esc6(unsigned char *s, unsigned char *d, int len);
extern void slip_unesc(struct slip *sl, unsigned char *s, int count, int error);
extern void slip_unesc6(struct slip *sl, unsigned char *s, int count, int error);
#endif /* _LINUX_SLIP.H */