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 1.3 1996/01/11 17:48:48 phk 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 /* PRI_NORMAL and PRI_FAST have meaning only on the IP queue. 49 * All IP frames have the same priority once they are compressed. 50 * IP frames stay on the IP queue till they can be sent on the 51 * link. They are compressed at that time. 52 */ 53 #define PRI_NORMAL 0 /* Normal priority */ 54 #define PRI_FAST 1 /* Fast (interractive) */ 55 #define PRI_LINK 1 /* Urgent (LQR packets) */ 56 57 unsigned char EscMap[33]; 58 59 void HdlcInit __P((void)); 60 void HdlcErrorCheck __P((void)); 61 void HdlcInput __P((struct mbuf *bp)); 62 void HdlcOutput __P((int pri, u_short proto, struct mbuf *bp)); 63 void AsyncOutput __P((int pri, struct mbuf *bp, int proto)); 64 u_short HdlcFcs __P((u_short, u_char *, int)); 65 void DecodePacket __P((u_short, struct mbuf *)); 66 #endif 67