hdlc.h revision 13389
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 1.2 1995/02/26 12:17:31 amurai 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 2000 43#define MIN_MRU 296 44 45/* 46 * Output priority 47 */ 48#define PRI_NORMAL 0 /* Normal priority */ 49#define PRI_FAST 1 /* Fast (interructive) */ 50#define PRI_URGENT 2 /* Urgent (LQR packets) */ 51 52unsigned char EscMap[33]; 53 54void HdlcInit __P((void)); 55void HdlcErrorCheck __P((void)); 56void HdlcInput __P((struct mbuf *bp)); 57void HdlcOutput __P((int pri, u_short proto, struct mbuf *bp)); 58void AsyncOutput __P((int pri, struct mbuf *bp, int proto)); 59u_short HdlcFcs __P((u_short, u_char *, int)); 60void DecodePacket __P((u_short, struct mbuf *)); 61#endif 62