158 lines
4.7 KiB
C
158 lines
4.7 KiB
C
/*-
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* Copyright (c) University of British Columbia, 1984
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by the
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* Laboratory for Computation Vision and the Computer Science Department
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* of the University of British Columbia.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)hdlc.h 8.1 (Berkeley) 6/10/93
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* $Id$
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*/
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#ifndef ORDER4
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#define FALSE 0
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#define TRUE 1
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typedef u_char octet;
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typedef char bool;
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/*
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* HDLC Packet format definitions
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* This will eventually have to be rewritten without reference
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* to bit fields, to be compliant with ANSI C and alignment safe.
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*/
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#if BYTE_ORDER == BIG_ENDIAN
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#define ORDER4(a, b, c, d) a , b , c , d
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#define ORDER5(a, b, c, d, e) a , b , c , d , e
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define ORDER4(a, b, c, d) d , c , b , a
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#define ORDER5(a, b, c, d, e) e , d , c , b , a
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#endif
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#endif
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#define MAX_INFO_LEN 4096+3+4
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#define ADDRESS_A 3 /* B'00000011' */
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#define ADDRESS_B 1 /* B'00000001' */
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struct Hdlc_iframe {
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octet address;
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octet ORDER4(nr:3, pf:1, ns:3, hdlc_0:1);
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octet i_field[MAX_INFO_LEN];
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};
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struct Hdlc_sframe {
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octet address;
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octet ORDER4(nr:3, pf:1, s2:2, hdlc_01:2);
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};
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struct Hdlc_uframe {
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octet address;
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octet ORDER4(m3:3, pf:1, m2:2, hdlc_11:2);
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};
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struct Frmr_frame {
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octet address;
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octet control;
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octet frmr_control;
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octet ORDER4(frmr_nr:3, frmr_f1_0:1, frmr_ns:3, frmr_f2_0:1);
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octet ORDER5(frmr_0000:4, frmr_z:1, frmr_y:1, frmr_x:1, frmr_w:1);
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};
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#define HDHEADERLN 2
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#define MINFRLN 2 /* Minimum frame length. */
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struct Hdlc_frame {
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octet address;
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octet control;
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octet info[3]; /* min for FRMR */
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};
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#define SABM_CONTROL 057 /* B'00101111' */
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#define UA_CONTROL 0143 /* B'01100011' */
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#define DISC_CONTROL 0103 /* B'01000011' */
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#define DM_CONTROL 017 /* B'00001111' */
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#define FRMR_CONTROL 0207 /* B'10000111' */
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#define RR_CONTROL 01 /* B'00000001' */
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#define RNR_CONTROL 05 /* B'00000101' */
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#define REJ_CONTROL 011 /* B'00001001' */
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#define POLLOFF 0
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#define POLLON 1
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/* Define Link State constants. */
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#define INIT 0
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#define DM_SENT 1
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#define SABM_SENT 2
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#define ABM 3
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#define WAIT_SABM 4
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#define WAIT_UA 5
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#define DISC_SENT 6
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#define DISCONNECTED 7
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#define MAXSTATE 8
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/* The following constants are used in a switch statement to process
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frames read from the communications line. */
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#define SABM 0 * MAXSTATE
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#define DM 1 * MAXSTATE
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#define DISC 2 * MAXSTATE
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#define UA 3 * MAXSTATE
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#define FRMR 4 * MAXSTATE
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#define RR 5 * MAXSTATE
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#define RNR 6 * MAXSTATE
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#define REJ 7 * MAXSTATE
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#define IFRAME 8 * MAXSTATE
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#define ILLEGAL 9 * MAXSTATE
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#define T1 (3 * PR_SLOWHZ) /* IFRAME TIMEOUT - 3 seconds */
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#define T3 (T1 / 2) /* RR generate timeout - 1.5 seconds */
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#define N2 10
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#define MODULUS 8
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#define MAX_WINDOW_SIZE 7
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#define Z 0
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#define Y 1
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#define X 2
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#define W 3
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#define A 4
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#define TX 0
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#define RX 1
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bool range_check ();
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bool valid_nr ();
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struct mbuf *hd_remove ();
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