hdlc.h revision 26516 
150476Speter/*
212821Sphk *	    Written by Toshiharu OHNO (tony-o@iij.ad.jp)
3278202Sngie *
4278202Sngie *   Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
5298107Sgjb *
6298107Sgjb * Redistribution and use in source and binary forms are permitted
7124747Sru * provided that the above copyright notice and this paragraph are
8124747Sru * duplicated in all such forms and that any documentation,
9180595Sdwmalone * advertising materials, and other materials related to such
10124747Sru * distribution and use acknowledge that the software was developed
11124747Sru * by the Internet Initiative Japan.  The name of the
12124747Sru * IIJ may not be used to endorse or promote products derived
13133265Smlaier * from this software without specific prior written permission.
14124747Sru * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
15124747Sru * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
16289467Scem * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
17124747Sru *
18129456Sdwmalone * $Id: hdlc.h,v 1.8 1997/06/01 11:35:02 brian Exp $
19124747Sru *
20230787Sbrueffer *	TODO:
21175578Sattilio */
22124747Sru
23124747Sru#ifndef _HDLC_H_
24124747Sru#define _HDLC_H_
25175578Sattilio
26124747Sru/*
27124747Sru *  Definition for Async HDLC
28124747Sru */
29129190Simp#define HDLC_SYN 0x7e	/* SYNC character */
30221231Sjhb#define HDLC_ESC 0x7d	/* Escape character */
31124747Sru#define HDLC_XOR 0x20	/* Modifier value */
32198085Sjhb
33124747Sru#define	HDLC_ADDR 0xff
34239512Sjhb#define	HDLC_UI	  0x03
35239515Sjhb/*
36124747Sru *  Definition for HDLC Frame Check Sequence
37198134Sjhb */
38115420Shmp#define INITFCS 0xffff	/* Initial value for FCS computation */
39124747Sru#define GOODFCS 0xf0b8	/* Good FCS value */
4084458Sbde
41193833Sjhb#define	DEF_MRU		1500
42124747Sru#define	MAX_MRU		2048
43124747Sru#define	MIN_MRU		296
44124747Sru
45299286Sjhb#define	DEF_MTU		0	/* whatever peer says */
46288271Scem#define	MAX_MTU		2048
47300317Sjhb#define	MIN_MTU		296
48193833Sjhb
49124747Sru/*
50124747Sru *  Output priority
51298707Sjhb */
52124747Sru/* PRI_NORMAL and PRI_FAST have meaning only on the IP queue.
53193833Sjhb * All IP frames have the same priority once they are compressed.
54112831Simp * IP frames stay on the IP queue till they can be sent on the
55124747Sru * link. They are compressed at that time.
56147359Simp*/
5791722Smike#define	PRI_NORMAL	0	/* Normal priority */
58273788Sjkim#define	PRI_FAST	1	/* Fast (interractive) */
59124747Sru#define	PRI_LINK	1	/* Urgent (LQR packets) */
60336346Skevans
61124747Sruunsigned char EscMap[33];
62162638Simp
63126689Sjkoshyvoid HdlcInit(void);
64124747Sruvoid HdlcErrorCheck(void);
65249268Sglebiusvoid HdlcInput(struct mbuf *bp);
66289667Scemvoid HdlcOutput(int pri, u_short proto, struct mbuf *bp);
67164408Scerivoid AsyncOutput(int pri, struct mbuf *bp, int proto);
68124747Sruu_short HdlcFcs(u_short, u_char *, int);
69124747Sruvoid DecodePacket(u_short, struct mbuf *);
70124747Sru#endif
71124747Sru