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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 */
-