Import of Linus's Linux 1.1.68

1 files changed, 92 insertions, 0 deletions

diff --git a/drivers/net/slip.h b/drivers/net/slip.h
new file mode 100644
index 000000000..8c2f3df96
--- /dev/null
+++ b/drivers/net/slip.h
@@ -0,0 +1,92 @@
+/*
+ * 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
+ *
+ * Author:	Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
+ */
+#ifndef _LINUX_SLIP_H
+#define _LINUX_SLIP_H
+
+/* SLIP configuration. */
+#ifndef SL_SLIP_LOTS
+#define SL_NRUNIT	4		/* number of SLIP channels	*/
+#else
+#define SL_NRUNIT	16
+#endif
+#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 {
+  int			magic;
+  /* 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		*/
+  unsigned char		*xhead;		/* XMIT buffer pointer (head)	*/
+  unsigned char		*xtail;		/* XMIT buffer pointer (tail)	*/
+
+  /* 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
+#define SLF_XMIT_BUSY	64
+  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 		*/
+};
+
+#define SLIP_MAGIC 0x5302
+
+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);
+extern void 	slip_unesc6(struct slip *sl, unsigned char s);
+
+#endif	/* _LINUX_SLIP.H */