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Annotation of Net2/netiso/esis.h, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1991 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)esis.h      7.4 (Berkeley) 5/6/91
        !            34:  */
        !            35: 
        !            36: /***********************************************************
        !            37:                Copyright IBM Corporation 1987
        !            38: 
        !            39:                       All Rights Reserved
        !            40: 
        !            41: Permission to use, copy, modify, and distribute this software and its 
        !            42: documentation for any purpose and without fee is hereby granted, 
        !            43: provided that the above copyright notice appear in all copies and that
        !            44: both that copyright notice and this permission notice appear in 
        !            45: supporting documentation, and that the name of IBM not be
        !            46: used in advertising or publicity pertaining to distribution of the
        !            47: software without specific, written prior permission.  
        !            48: 
        !            49: IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
        !            50: ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
        !            51: IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
        !            52: ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
        !            53: WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
        !            54: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
        !            55: SOFTWARE.
        !            56: 
        !            57: ******************************************************************/
        !            58: 
        !            59: /*
        !            60:  * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
        !            61:  */
        !            62: /*
        !            63:  *     $Header: esis.h,v 4.7 88/09/15 11:24:18 hagens Exp $
        !            64:  *     $Source: /usr/argo/sys/netiso/RCS/esis.h,v $
        !            65:  */
        !            66: 
        !            67: #ifndef BYTE_ORDER
        !            68: /*
        !            69:  * Definitions for byte order,
        !            70:  * according to byte significance from low address to high.
        !            71:  */
        !            72: #define        LITTLE_ENDIAN   1234    /* least-significant byte first (vax) */
        !            73: #define        BIG_ENDIAN      4321    /* most-significant byte first (IBM, net) */
        !            74: #define        PDP_ENDIAN      3412    /* LSB first in word, MSW first in long (pdp) */
        !            75: 
        !            76: #ifdef vax
        !            77: #define        BYTE_ORDER      LITTLE_ENDIAN
        !            78: #else
        !            79: #define        BYTE_ORDER      BIG_ENDIAN      /* mc68000, tahoe, most others */
        !            80: #endif
        !            81: #endif BYTE_ORDER
        !            82: 
        !            83: #define        SNPAC_AGE               60                      /* seconds */
        !            84: #define        ESIS_CONFIG             60                      /* seconds */
        !            85: #define        ESIS_HT                 (ESIS_CONFIG * 2)
        !            86: 
        !            87: /*
        !            88:  *     Fixed part of an ESIS header
        !            89:  */
        !            90: struct esis_fixed {
        !            91:        u_char  esis_proto_id;          /* network layer protocol identifier */
        !            92:        u_char  esis_hdr_len;           /* length indicator (octets) */
        !            93:        u_char  esis_vers;                      /* version/protocol identifier extension */
        !            94:        u_char  esis_res1;                      /* reserved */
        !            95:        u_char  esis_type;                      /* type code */
        !            96: /* technically, type should be &='d 0x1f */
        !            97: #define ESIS_ESH       0x02            /* End System Hello */
        !            98: #define ESIS_ISH       0x04            /* Intermediate System Hello */
        !            99: #define ESIS_RD                0x06            /* Redirect */
        !           100:        u_char  esis_ht_msb;            /* holding time (seconds) high byte */
        !           101:        u_char  esis_ht_lsb;            /* holding time (seconds) low byte */
        !           102:        u_char  esis_cksum_msb;         /* checksum high byte */
        !           103:        u_char  esis_cksum_lsb;         /* checksum low byte */
        !           104: };
        !           105: /*
        !           106:  * Values for ESIS datagram options
        !           107:  */
        !           108: #define ESISOVAL_NETMASK       0xe1    /* address mask option, RD PDU only */
        !           109: #define ESISOVAL_SNPAMASK      0xe2    /* snpa mask option, RD PDU only */
        !           110: #define ESISOVAL_ESCT          0xc6    /* end system conf. timer, ISH PDU only */
        !           111: 
        !           112: 
        !           113: #define        ESIS_CKSUM_OFF          0x07
        !           114: #define ESIS_CKSUM_REQUIRED(pdu)\
        !           115:        ((pdu->esis_cksum_msb != 0) || (pdu->esis_cksum_lsb != 0))
        !           116: 
        !           117: #define        ESIS_VERSION    1
        !           118: 
        !           119: struct esis_stat {
        !           120:        u_short         es_nomem;                       /* insufficient memory to send hello */
        !           121:        u_short         es_badcsum;                     /* incorrect checksum */
        !           122:        u_short         es_badvers;                     /* incorrect version number */
        !           123:        u_short         es_badtype;                     /* unknown pdu type field */
        !           124:        u_short         es_toosmall;            /* packet too small */
        !           125:        u_short         es_eshsent;                     /* ESH sent */
        !           126:        u_short         es_eshrcvd;                     /* ESH rcvd */
        !           127:        u_short         es_ishsent;                     /* ISH sent */
        !           128:        u_short         es_ishrcvd;                     /* ISH rcvd */
        !           129:        u_short         es_rdsent;                      /* RD sent */
        !           130:        u_short         es_rdrcvd;                      /* RD rcvd */
        !           131: };
        !           132: 
        !           133: #ifdef KERNEL
        !           134: struct esis_stat esis_stat;
        !           135: #endif KERNEL

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