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Diffstat (limited to 'sys/netccitt/hdlc.h')
| -rw-r--r-- | sys/netccitt/hdlc.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/sys/netccitt/hdlc.h b/sys/netccitt/hdlc.h new file mode 100644 index 0000000..f7fd793 --- /dev/null +++ b/sys/netccitt/hdlc.h @@ -0,0 +1,162 @@ +/*- + * Copyright (c) University of British Columbia, 1984 + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * 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 + * are met: + * 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 + * SUCH DAMAGE. + * + * @(#)hdlc.h 8.1 (Berkeley) 6/10/93 + * $Id: hdlc.h,v 1.2 1994/08/02 07:47:12 davidg Exp $ + */ + +#ifndef _NETCCITT_HDLC_H_ +#define _NETCCITT_HDLC_H_ + +#ifndef ORDER4 +#define FALSE 0 +#define TRUE 1 +typedef u_char octet; +typedef char bool; + +/* + * 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 +#endif + +#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 +#endif +#endif + +#define MAX_INFO_LEN 4096+3+4 +#define ADDRESS_A 3 /* B'00000011' */ +#define ADDRESS_B 1 /* B'00000001' */ + +struct Hdlc_iframe { + octet address; + octet ORDER4(nr:3, pf:1, ns:3, hdlc_0:1); + octet i_field[MAX_INFO_LEN]; +}; + +struct Hdlc_sframe { + octet address; + octet ORDER4(nr:3, pf:1, s2:2, hdlc_01:2); +}; + +struct Hdlc_uframe { + octet address; + octet ORDER4(m3:3, pf:1, m2:2, hdlc_11:2); +}; + +struct Frmr_frame { + octet address; + octet control; + octet frmr_control; + 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 HDHEADERLN 2 +#define MINFRLN 2 /* Minimum frame length. */ + +struct Hdlc_frame { + octet address; + octet control; + 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 POLLOFF 0 +#define POLLON 1 + +/* Define Link State constants. */ + +#define INIT 0 +#define DM_SENT 1 +#define SABM_SENT 2 +#define ABM 3 +#define WAIT_SABM 4 +#define WAIT_UA 5 +#define DISC_SENT 6 +#define DISCONNECTED 7 +#define MAXSTATE 8 + +/* The following constants are used in a switch statement to process + frames read from the communications line. */ + +#define SABM 0 * MAXSTATE +#define DM 1 * MAXSTATE +#define DISC 2 * MAXSTATE +#define UA 3 * MAXSTATE +#define FRMR 4 * MAXSTATE +#define RR 5 * MAXSTATE +#define RNR 6 * MAXSTATE +#define REJ 7 * 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 N2 10 +#define MODULUS 8 +#define MAX_WINDOW_SIZE 7 + +#define Z 0 +#define Y 1 +#define X 2 +#define W 3 +#define A 4 + +#define TX 0 +#define RX 1 + +bool range_check (); +bool valid_nr (); +struct mbuf *hd_remove (); + +#endif |
