1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
/*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the Internet Initiative Japan. The name of the
* IIJ may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $FreeBSD$
*
* TODO:
*/
#ifndef _HDLC_H_
#define _HDLC_H_
/*
* Definition for Async HDLC
*/
#define HDLC_SYN 0x7e /* SYNC character */
#define HDLC_ESC 0x7d /* Escape character */
#define HDLC_XOR 0x20 /* Modifier value */
#define HDLC_ADDR 0xff
#define HDLC_UI 0x03
/*
* Definition for HDLC Frame Check Sequence
*/
#define INITFCS 0xffff /* Initial value for FCS computation */
#define GOODFCS 0xf0b8 /* Good FCS value */
#define DEF_MRU 1500
#define MAX_MRU 2000
#define MIN_MRU 296
/*
* Output priority
*/
/* PRI_NORMAL and PRI_FAST have meaning only on the IP queue.
* All IP frames have the same priority once they are compressed.
* IP frames stay on the IP queue till they can be sent on the
* link. They are compressed at that time.
*/
#define PRI_NORMAL 0 /* Normal priority */
#define PRI_FAST 1 /* Fast (interractive) */
#define PRI_LINK 1 /* Urgent (LQR packets) */
unsigned char EscMap[33];
void HdlcInit __P((void));
void HdlcErrorCheck __P((void));
void HdlcInput __P((struct mbuf *bp));
void HdlcOutput __P((int pri, u_short proto, struct mbuf *bp));
void AsyncOutput __P((int pri, struct mbuf *bp, int proto));
u_short HdlcFcs __P((u_short, u_char *, int));
void DecodePacket __P((u_short, struct mbuf *));
#endif
|
