* Copyright (c) University of British Columbia, 1984
* Copyright (c) 1991 The Regents of the University of California.
* This code is derived from software contributed to Berkeley by the
* Laboratory for Computation Vision and the Computer Science Department
* of the University of British Columbia.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* from: @(#)hdlc.h 7.4 (Berkeley) 5/6/91
* $Id: hdlc.h,v 1.2 1993/10/16 19:46:43 rgrimes Exp $
#ifndef _NETCCITT_HDLC_H_
#define _NETCCITT_HDLC_H_ 1
* HDLC Packet format definitions
* This will eventually have to be rewritten without reference
* to bit fields, to be compliant with ANSI C and alignment safe.
#if BYTE_ORDER == BIG_ENDIAN
#define ORDER4(a, b, c, d) a , b , c , d
#define ORDER5(a, b, c, d, e) a , b , c , d , e
#if BYTE_ORDER == LITTLE_ENDIAN
#define ORDER4(a, b, c, d) d , c , b , a
#define ORDER5(a, b, c, d, e) e , d , c , b , a
#define MAX_INFO_LEN 4096+3+4
#define ADDRESS_A 3 /* B'00000011' */
#define ADDRESS_B 1 /* B'00000001' */
octet
ORDER4(nr
:3, pf
:1, ns
:3, hdlc_0
:1);
octet i_field
[MAX_INFO_LEN
];
octet
ORDER4(nr
:3, pf
:1, s2
:2, hdlc_01
:2);
octet
ORDER4(m3
:3, pf
:1, m2
:2, hdlc_11
:2);
octet
ORDER4(frmr_nr
:3, frmr_f1_0
:1, frmr_ns
:3, frmr_f2_0
:1);
octet
ORDER5(frmr_0000
:4, frmr_z
:1, frmr_y
:1, frmr_x
:1, frmr_w
:1);
#define MINFRLN 2 /* Minimum frame length. */
octet info
[3]; /* min for FRMR */
#define SABM_CONTROL 057 /* B'00101111' */
#define UA_CONTROL 0143 /* B'01100011' */
#define DISC_CONTROL 0103 /* B'01000011' */
#define DM_CONTROL 017 /* B'00001111' */
#define FRMR_CONTROL 0207 /* B'10000111' */
#define RR_CONTROL 01 /* B'00000001' */
#define RNR_CONTROL 05 /* B'00000101' */
#define REJ_CONTROL 011 /* B'00001001' */
/* Define Link State constants. */
/* The following constants are used in a switch statement to process
frames read from the communications line. */
#define SABM 0 * MAXSTATE
#define DISC 2 * MAXSTATE
#define FRMR 4 * MAXSTATE
#define IFRAME 8 * MAXSTATE
#define ILLEGAL 9 * MAXSTATE
#define T1 (3 * PR_SLOWHZ) /* IFRAME TIMEOUT - 3 seconds */
#define T3 (T1 / 2) /* RR generate timeout - 1.5 seconds */
#define MAX_WINDOW_SIZE 7
struct mbuf
*hd_remove ();
#endif /* _NETCCITT_HDLC_H_ */