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Annotation of Net2/netccitt/pk.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) University of British Columbia, 1984
        !             3:  * Copyright (c) 1990 The Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * the Laboratory for Computation Vision and the Computer Science Department
        !             8:  * of the University of British Columbia.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  *     @(#)pk.h        7.8 (Berkeley) 4/30/91
        !            39:  */
        !            40: 
        !            41: /*
        !            42:  *
        !            43:  *  X.25 Packet Level Definitions:
        !            44:  *
        !            45:  */
        !            46: 
        !            47: /* Packet type identifier field defintions. */
        !            48: 
        !            49: #define X25_CALL                         11
        !            50: #define X25_CALL_ACCEPTED                15   
        !            51: #define X25_CLEAR                        19
        !            52: #define X25_CLEAR_CONFIRM                23  
        !            53: #define X25_DATA                          0   
        !            54: #define X25_INTERRUPT                    35   
        !            55: #define X25_INTERRUPT_CONFIRM            39   
        !            56: 
        !            57: #define X25_RR                            1   
        !            58: #define X25_RNR                           5   
        !            59: #define X25_REJECT                       9
        !            60: #define X25_RESET                        27 
        !            61: #define X25_RESET_CONFIRM                31   
        !            62: #define X25_DIAGNOSTIC                 241
        !            63: 
        !            64: #define X25_RESTART                     251     
        !            65: #define X25_RESTART_CONFIRM            255 
        !            66: 
        !            67: /* Restart cause field definitions. */
        !            68: 
        !            69: #define X25_RESTART_LOCAL_PROCEDURE_ERROR 1
        !            70: #define X25_RESTART_NETWORK_CONGESTION   3
        !            71: #define X25_RESTART_NETWORK_OPERATIONAL          7
        !            72: 
        !            73: /* Miscellaneous definitions. */
        !            74: 
        !            75: #define DATA_PACKET_DESIGNATOR         0x01
        !            76: #define RR_OR_RNR_PACKET_DESIGNATOR    0x02
        !            77: #define RR_PACKET_DESIGNATOR           0x04
        !            78: 
        !            79: #define DEFAULT_WINDOW_SIZE            2
        !            80: #define MODULUS                                8
        !            81: 
        !            82: #define ADDRLN                         1
        !            83: #define MAXADDRLN                      15
        !            84: #define FACILITIESLN                   1
        !            85: #define MAXFACILITIESLN                        10
        !            86: #define MAXUSERDATA                    16
        !            87: #define MAXCALLINFOLN                  1+15+1+10+16
        !            88: 
        !            89: #define PACKET_OK                      0
        !            90: #define IGNORE_PACKET                  1
        !            91: #define ERROR_PACKET                   2
        !            92: 
        !            93: typedef char    bool;
        !            94: #define FALSE  0
        !            95: #define TRUE   1
        !            96: 
        !            97: /*
        !            98:  *  X.25 Packet format definitions
        !            99:  *  This will eventually have to be rewritten without reference
        !           100:  *  to bit fields, to be ansi C compliant and allignment safe.
        !           101:  */
        !           102: 
        !           103: #if BYTE_ORDER == BIG_ENDIAN
        !           104: #define ORDER2(a, b) a , b
        !           105: #define ORDER4(a, b, c, d) a , b , c , d
        !           106: #endif
        !           107: 
        !           108: #if BYTE_ORDER == LITTLE_ENDIAN
        !           109: #define ORDER2(a, b) b , a
        !           110: #define ORDER4(a, b, c, d) d , c , b , a
        !           111: #endif
        !           112: 
        !           113: typedef u_char octet;
        !           114: 
        !           115: struct x25_calladdr {
        !           116:        octet ORDER2(calling_addrlen:4, called_addrlen:4);
        !           117:        octet address_field[MAXADDRLN];
        !           118: };
        !           119: 
        !           120: struct x25_packet {
        !           121:        octet ORDER4(q_bit:1, d_bit:1, fmt_identifier:2, lc_group_number:4);
        !           122:        octet logical_channel_number;
        !           123:        octet packet_type;
        !           124:        octet packet_data;
        !           125: };
        !           126: 
        !           127: struct data_packet {
        !           128:        octet ORDER4(pr:3, m_bit:1, ps:3, z:1);
        !           129: };
        !           130: 
        !           131: #define FACILITIES_REVERSE_CHARGE      0x1
        !           132: #define FACILITIES_THROUGHPUT          0x2
        !           133: #define FACILITIES_PACKETSIZE          0x42
        !           134: #define FACILITIES_WINDOWSIZE          0x43
        !           135: 
        !           136: #define PKHEADERLN     3
        !           137: 
        !           138: 
        !           139: #define PR(xp)         (((struct data_packet *)&xp -> packet_type)->pr)
        !           140: #define PS(xp)         (((struct data_packet *)&xp -> packet_type)->ps)
        !           141: #define MBIT(xp)       (((struct data_packet *)&xp -> packet_type)->m_bit)
        !           142: #define LCN(xp)                (xp -> logical_channel_number + \
        !           143:        (xp -> lc_group_number ? (xp -> lc_group_number >> 8) : 0))
        !           144: #define SET_LCN(xp, lcn) ((xp -> logical_channel_number = lcn), \
        !           145:        (xp -> lc_group_number = lcn > 255 ? lcn >> 8 : 0))
        !           146: 
        !           147: struct mbuf *pk_template ();
        !           148: 
        !           149: /* Define X.25 packet level states. */
        !           150: 
        !           151: /* Call setup and clearing substates.  */
        !           152: 
        !           153: #define LISTEN           0
        !           154: #define READY            1
        !           155: #define RECEIVED_CALL    2
        !           156: #define SENT_CALL        3
        !           157: #define DATA_TRANSFER    4
        !           158: #define RECEIVED_CLEAR   5
        !           159: #define SENT_CLEAR       6
        !           160: 
        !           161: /* DTE states. */
        !           162: 
        !           163: #define DTE_WAITING            7
        !           164: #define DTE_RECEIVED_RESTART   8
        !           165: #define DTE_SENT_RESTART       9
        !           166: #define DTE_READY              0
        !           167: 
        !           168: #define MAXSTATES              10
        !           169: 
        !           170: /*
        !           171:  *  The following definitions are used in a switch statement after
        !           172:  *  determining the packet type.  These values are returned by the
        !           173:  *  pk_decode procedure. 
        !           174:  */
        !           175: 
        !           176: #define CALL             0 * MAXSTATES
        !           177: #define CALL_ACCEPTED    1 * MAXSTATES
        !           178: #define CLEAR            2 * MAXSTATES
        !           179: #define CLEAR_CONF       3 * MAXSTATES
        !           180: #define DATA             4 * MAXSTATES
        !           181: #define INTERRUPT        5 * MAXSTATES
        !           182: #define INTERRUPT_CONF   6 * MAXSTATES
        !           183: #define RR               7 * MAXSTATES
        !           184: #define RNR              8 * MAXSTATES
        !           185: #define RESET            9 * MAXSTATES
        !           186: #define RESET_CONF      10 * MAXSTATES
        !           187: #define RESTART         11 * MAXSTATES
        !           188: #define RESTART_CONF    12 * MAXSTATES
        !           189: #define REJECT          13 * MAXSTATES
        !           190: #define DIAG_TYPE       14 * MAXSTATES
        !           191: #define INVALID_PACKET  15 * MAXSTATES
        !           192: #define DELETE_PACKET  INVALID_PACKET

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