hdlc.h revision 32663 
1/*
2 *	    Written by Toshiharu OHNO (tony-o@iij.ad.jp)
3 *
4 *   Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
5 *
6 * Redistribution and use in source and binary forms are permitted
7 * provided that the above copyright notice and this paragraph are
8 * duplicated in all such forms and that any documentation,
9 * advertising materials, and other materials related to such
10 * distribution and use acknowledge that the software was developed
11 * by the Internet Initiative Japan.  The name of the
12 * IIJ may not be used to endorse or promote products derived
13 * from this software without specific prior written permission.
14 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
16 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
17 *
18 * $Id: hdlc.h,v 1.13 1997/12/03 10:23:48 brian Exp $
19 *
20 *	TODO:
21 */
22
23/*
24 *  Definition for Async HDLC
25 */
26#define HDLC_SYN 0x7e		/* SYNC character */
27#define HDLC_ESC 0x7d		/* Escape character */
28#define HDLC_XOR 0x20		/* Modifier value */
29
30#define	HDLC_ADDR 0xff
31#define	HDLC_UI	  0x03
32/*
33 *  Definition for HDLC Frame Check Sequence
34 */
35#define INITFCS 0xffff		/* Initial value for FCS computation */
36#define GOODFCS 0xf0b8		/* Good FCS value */
37
38#define	DEF_MRU		1500
39#define	MAX_MRU		2048
40#define	MIN_MRU		296
41
42#define	DEF_MTU		0	/* whatever peer says */
43#define	MAX_MTU		2048
44#define	MIN_MTU		296
45
46/*
47 *  Output priority
48 */
49/* PRI_NORMAL and PRI_FAST have meaning only on the IP queue.
50 * All IP frames have the same priority once they are compressed.
51 * IP frames stay on the IP queue till they can be sent on the
52 * link. They are compressed at that time.
53*/
54#define	PRI_NORMAL	0	/* Normal priority */
55#define	PRI_FAST	1	/* Fast (interractive) */
56#define	PRI_LINK	1	/* Urgent (LQR packets) */
57
58extern u_char EscMap[33];
59
60extern void HdlcInit(void);
61extern void HdlcErrorCheck(void);
62extern void HdlcInput(struct mbuf *);
63extern void HdlcOutput(int, u_short, struct mbuf *bp);
64extern u_short HdlcFcs(u_short, u_char *, int);
65extern int ReportHdlcStatus(struct cmdargs const *);
66extern int ReportProtStatus(struct cmdargs const *);
67