/* * 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 */