1*36380Ssklower /*********************************************************** 2*36380Ssklower Copyright IBM Corporation 1987 3*36380Ssklower 4*36380Ssklower All Rights Reserved 5*36380Ssklower 6*36380Ssklower Permission to use, copy, modify, and distribute this software and its 7*36380Ssklower documentation for any purpose and without fee is hereby granted, 8*36380Ssklower provided that the above copyright notice appear in all copies and that 9*36380Ssklower both that copyright notice and this permission notice appear in 10*36380Ssklower supporting documentation, and that the name of IBM not be 11*36380Ssklower used in advertising or publicity pertaining to distribution of the 12*36380Ssklower software without specific, written prior permission. 13*36380Ssklower 14*36380Ssklower IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING 15*36380Ssklower ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL 16*36380Ssklower IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR 17*36380Ssklower ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 18*36380Ssklower WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 19*36380Ssklower ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 20*36380Ssklower SOFTWARE. 21*36380Ssklower 22*36380Ssklower ******************************************************************/ 23*36380Ssklower 24*36380Ssklower /* 25*36380Ssklower * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison 26*36380Ssklower */ 27*36380Ssklower /* 28*36380Ssklower * $Header: esis.h,v 4.7 88/09/15 11:24:18 hagens Exp $ 29*36380Ssklower * $Source: /usr/argo/sys/netiso/RCS/esis.h,v $ 30*36380Ssklower */ 31*36380Ssklower 32*36380Ssklower #ifndef BYTE_ORDER 33*36380Ssklower /* 34*36380Ssklower * Definitions for byte order, 35*36380Ssklower * according to byte significance from low address to high. 36*36380Ssklower */ 37*36380Ssklower #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */ 38*36380Ssklower #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ 39*36380Ssklower #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */ 40*36380Ssklower 41*36380Ssklower #ifdef vax 42*36380Ssklower #define BYTE_ORDER LITTLE_ENDIAN 43*36380Ssklower #else 44*36380Ssklower #define BYTE_ORDER BIG_ENDIAN /* mc68000, tahoe, most others */ 45*36380Ssklower #endif 46*36380Ssklower #endif BYTE_ORDER 47*36380Ssklower 48*36380Ssklower #define SNPAC_AGE 60 /* seconds */ 49*36380Ssklower #define ESIS_CONFIG 60 /* seconds */ 50*36380Ssklower #define ESIS_HT (ESIS_CONFIG * 2) 51*36380Ssklower 52*36380Ssklower /* 53*36380Ssklower * Fixed part of an ESIS header 54*36380Ssklower */ 55*36380Ssklower struct esis_fixed { 56*36380Ssklower u_char esis_proto_id; /* network layer protocol identifier */ 57*36380Ssklower u_char esis_hdr_len; /* length indicator (octets) */ 58*36380Ssklower u_char esis_vers; /* version/protocol identifier extension */ 59*36380Ssklower u_char esis_res1; /* reserved */ 60*36380Ssklower #if BYTE_ORDER == LITTLE_ENDIAN 61*36380Ssklower u_char esis_type:5, /* type code */ 62*36380Ssklower esis_res4:1, /* reserved */ 63*36380Ssklower esis_res3:1, /* reserved */ 64*36380Ssklower esis_res2:1; /* reserved */ 65*36380Ssklower #define ESIS_ESH 0x02 /* End System Hello */ 66*36380Ssklower #define ESIS_ISH 0x04 /* Intermediate System Hello */ 67*36380Ssklower #define ESIS_RD 0x06 /* Redirect */ 68*36380Ssklower #endif 69*36380Ssklower #if BYTE_ORDER == BIG_ENDIAN 70*36380Ssklower u_char esis_res2:1, /* reserved */ 71*36380Ssklower esis_res3:1, /* reserved */ 72*36380Ssklower esis_res4:1, /* reserved */ 73*36380Ssklower esis_type:5; /* type code */ 74*36380Ssklower #define ESIS_ESH 0x02 /* End System Hello */ 75*36380Ssklower #define ESIS_ISH 0x04 /* Intermediate System Hello */ 76*36380Ssklower #define ESIS_RD 0x06 /* Redirect */ 77*36380Ssklower #endif 78*36380Ssklower u_char esis_ht_msb; /* holding time (seconds) high byte */ 79*36380Ssklower u_char esis_ht_lsb; /* holding time (seconds) low byte */ 80*36380Ssklower u_char esis_cksum_msb; /* checksum high byte */ 81*36380Ssklower u_char esis_cksum_lsb; /* checksum low byte */ 82*36380Ssklower }; 83*36380Ssklower 84*36380Ssklower #define ESIS_CKSUM_OFF 0x07 85*36380Ssklower #define ESIS_CKSUM_REQUIRED(pdu)\ 86*36380Ssklower ((pdu->esis_cksum_msb != 0) || (pdu->esis_cksum_lsb != 0)) 87*36380Ssklower 88*36380Ssklower #define ESIS_VERSION 1 89*36380Ssklower 90*36380Ssklower struct esis_stat { 91*36380Ssklower u_short es_nomem; /* insufficient memory to send hello */ 92*36380Ssklower u_short es_badcsum; /* incorrect checksum */ 93*36380Ssklower u_short es_badvers; /* incorrect version number */ 94*36380Ssklower u_short es_badtype; /* unknown pdu type field */ 95*36380Ssklower u_short es_toosmall; /* packet too small */ 96*36380Ssklower u_short es_eshsent; /* ESH sent */ 97*36380Ssklower u_short es_eshrcvd; /* ESH rcvd */ 98*36380Ssklower u_short es_ishsent; /* ISH sent */ 99*36380Ssklower u_short es_ishrcvd; /* ISH rcvd */ 100*36380Ssklower u_short es_rdsent; /* RD sent */ 101*36380Ssklower u_short es_rdrcvd; /* RD rcvd */ 102*36380Ssklower }; 103*36380Ssklower 104*36380Ssklower #ifdef KERNEL 105*36380Ssklower struct esis_stat esis_stat; 106*36380Ssklower #endif KERNEL 107