0d8fb00071
ppp link, we gain nothing with a larger mtu. Suggested by: joerg Fix pred1 buffer size (must be == MAX_MTU)
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: hdlc.h,v 1.7 1997/06/01 01:13:02 brian Exp $
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*
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* TODO:
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*/
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#ifndef _HDLC_H_
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#define _HDLC_H_
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/*
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* Definition for Async HDLC
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*/
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#define HDLC_SYN 0x7e /* SYNC character */
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#define HDLC_ESC 0x7d /* Escape character */
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#define HDLC_XOR 0x20 /* Modifier value */
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#define HDLC_ADDR 0xff
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#define HDLC_UI 0x03
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/*
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* Definition for HDLC Frame Check Sequence
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*/
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#define INITFCS 0xffff /* Initial value for FCS computation */
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#define GOODFCS 0xf0b8 /* Good FCS value */
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#define DEF_MRU 1500
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#define MAX_MRU 2048
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#define MIN_MRU 296
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#define DEF_MTU 0 /* whatever peer says */
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#define MAX_MTU 2048
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#define MIN_MTU 296
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/*
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* Output priority
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*/
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/* PRI_NORMAL and PRI_FAST have meaning only on the IP queue.
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* All IP frames have the same priority once they are compressed.
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* IP frames stay on the IP queue till they can be sent on the
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* link. They are compressed at that time.
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*/
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#define PRI_NORMAL 0 /* Normal priority */
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#define PRI_FAST 1 /* Fast (interractive) */
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#define PRI_LINK 1 /* Urgent (LQR packets) */
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unsigned char EscMap[33];
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void HdlcInit __P((void));
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void HdlcErrorCheck __P((void));
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void HdlcInput __P((struct mbuf *bp));
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void HdlcOutput __P((int pri, u_short proto, struct mbuf *bp));
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void AsyncOutput __P((int pri, struct mbuf *bp, int proto));
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u_short HdlcFcs __P((u_short, u_char *, int));
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void DecodePacket __P((u_short, struct mbuf *));
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#endif
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