1 /*********************************************************** 2 Copyright IBM Corporation 1987 3 4 All Rights Reserved 5 6 Permission to use, copy, modify, and distribute this software and its 7 documentation for any purpose and without fee is hereby granted, 8 provided that the above copyright notice appear in all copies and that 9 both that copyright notice and this permission notice appear in 10 supporting documentation, and that the name of IBM not be 11 used in advertising or publicity pertaining to distribution of the 12 software without specific, written prior permission. 13 14 IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING 15 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL 16 IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR 17 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 18 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 19 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 20 SOFTWARE. 21 22 ******************************************************************/ 23 24 /* 25 * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison 26 */ 27 /* 28 * $Header: esis.h,v 4.7 88/09/15 11:24:18 hagens Exp $ 29 * $Source: /usr/argo/sys/netiso/RCS/esis.h,v $ 30 */ 31 32 #ifndef BYTE_ORDER 33 /* 34 * Definitions for byte order, 35 * according to byte significance from low address to high. 36 */ 37 #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */ 38 #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ 39 #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */ 40 41 #ifdef vax 42 #define BYTE_ORDER LITTLE_ENDIAN 43 #else 44 #define BYTE_ORDER BIG_ENDIAN /* mc68000, tahoe, most others */ 45 #endif 46 #endif BYTE_ORDER 47 48 #define SNPAC_AGE 60 /* seconds */ 49 #define ESIS_CONFIG 60 /* seconds */ 50 #define ESIS_HT (ESIS_CONFIG * 2) 51 52 /* 53 * Fixed part of an ESIS header 54 */ 55 struct esis_fixed { 56 u_char esis_proto_id; /* network layer protocol identifier */ 57 u_char esis_hdr_len; /* length indicator (octets) */ 58 u_char esis_vers; /* version/protocol identifier extension */ 59 u_char esis_res1; /* reserved */ 60 #if BYTE_ORDER == LITTLE_ENDIAN 61 u_char esis_type:5, /* type code */ 62 esis_res4:1, /* reserved */ 63 esis_res3:1, /* reserved */ 64 esis_res2:1; /* reserved */ 65 #define ESIS_ESH 0x02 /* End System Hello */ 66 #define ESIS_ISH 0x04 /* Intermediate System Hello */ 67 #define ESIS_RD 0x06 /* Redirect */ 68 #endif 69 #if BYTE_ORDER == BIG_ENDIAN 70 u_char esis_res2:1, /* reserved */ 71 esis_res3:1, /* reserved */ 72 esis_res4:1, /* reserved */ 73 esis_type:5; /* type code */ 74 #define ESIS_ESH 0x02 /* End System Hello */ 75 #define ESIS_ISH 0x04 /* Intermediate System Hello */ 76 #define ESIS_RD 0x06 /* Redirect */ 77 #endif 78 u_char esis_ht_msb; /* holding time (seconds) high byte */ 79 u_char esis_ht_lsb; /* holding time (seconds) low byte */ 80 u_char esis_cksum_msb; /* checksum high byte */ 81 u_char esis_cksum_lsb; /* checksum low byte */ 82 }; 83 84 #define ESIS_CKSUM_OFF 0x07 85 #define ESIS_CKSUM_REQUIRED(pdu)\ 86 ((pdu->esis_cksum_msb != 0) || (pdu->esis_cksum_lsb != 0)) 87 88 #define ESIS_VERSION 1 89 90 struct esis_stat { 91 u_short es_nomem; /* insufficient memory to send hello */ 92 u_short es_badcsum; /* incorrect checksum */ 93 u_short es_badvers; /* incorrect version number */ 94 u_short es_badtype; /* unknown pdu type field */ 95 u_short es_toosmall; /* packet too small */ 96 u_short es_eshsent; /* ESH sent */ 97 u_short es_eshrcvd; /* ESH rcvd */ 98 u_short es_ishsent; /* ISH sent */ 99 u_short es_ishrcvd; /* ISH rcvd */ 100 u_short es_rdsent; /* RD sent */ 101 u_short es_rdrcvd; /* RD rcvd */ 102 }; 103 104 #ifdef KERNEL 105 struct esis_stat esis_stat; 106 #endif KERNEL 107