hdlc.h revision 26326
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 1.6 1997/02/22 16:10:17 peter Exp $ 19 * 20 * TODO: 21 */ 22 23#ifndef _HDLC_H_ 24#define _HDLC_H_ 25 26/* 27 * Definition for Async HDLC 28 */ 29#define HDLC_SYN 0x7e /* SYNC character */ 30#define HDLC_ESC 0x7d /* Escape character */ 31#define HDLC_XOR 0x20 /* Modifier value */ 32 33#define HDLC_ADDR 0xff 34#define HDLC_UI 0x03 35/* 36 * Definition for HDLC Frame Check Sequence 37 */ 38#define INITFCS 0xffff /* Initial value for FCS computation */ 39#define GOODFCS 0xf0b8 /* Good FCS value */ 40 41#define DEF_MRU 1500 42#define MAX_MRU 16384 43#define MIN_MRU 296 44 45#define DEF_MTU 0 /* whatever peer says */ 46#define MAX_MTU 16384 47#define MIN_MTU 296 48 49/* 50 * Output priority 51 */ 52/* PRI_NORMAL and PRI_FAST have meaning only on the IP queue. 53 * All IP frames have the same priority once they are compressed. 54 * IP frames stay on the IP queue till they can be sent on the 55 * link. They are compressed at that time. 56*/ 57#define PRI_NORMAL 0 /* Normal priority */ 58#define PRI_FAST 1 /* Fast (interractive) */ 59#define PRI_LINK 1 /* Urgent (LQR packets) */ 60 61unsigned char EscMap[33]; 62 63void HdlcInit __P((void)); 64void HdlcErrorCheck __P((void)); 65void HdlcInput __P((struct mbuf *bp)); 66void HdlcOutput __P((int pri, u_short proto, struct mbuf *bp)); 67void AsyncOutput __P((int pri, struct mbuf *bp, int proto)); 68u_short HdlcFcs __P((u_short, u_char *, int)); 69void DecodePacket __P((u_short, struct mbuf *)); 70#endif 71