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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 $ | |
44f52ea5 | 30 | * @(#)esis.h 7.3 (Berkeley) %G% * |
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31 | */ |
32 | ||
33 | #ifndef BYTE_ORDER | |
34 | /* | |
35 | * Definitions for byte order, | |
36 | * according to byte significance from low address to high. | |
37 | */ | |
38 | #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */ | |
39 | #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ | |
40 | #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */ | |
41 | ||
42 | #ifdef vax | |
43 | #define BYTE_ORDER LITTLE_ENDIAN | |
44 | #else | |
45 | #define BYTE_ORDER BIG_ENDIAN /* mc68000, tahoe, most others */ | |
46 | #endif | |
47 | #endif BYTE_ORDER | |
48 | ||
49 | #define SNPAC_AGE 60 /* seconds */ | |
50 | #define ESIS_CONFIG 60 /* seconds */ | |
51 | #define ESIS_HT (ESIS_CONFIG * 2) | |
52 | ||
53 | /* | |
54 | * Fixed part of an ESIS header | |
55 | */ | |
56 | struct esis_fixed { | |
57 | u_char esis_proto_id; /* network layer protocol identifier */ | |
58 | u_char esis_hdr_len; /* length indicator (octets) */ | |
59 | u_char esis_vers; /* version/protocol identifier extension */ | |
60 | u_char esis_res1; /* reserved */ | |
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61 | u_char esis_type; /* type code */ |
62 | /* technically, type should be &='d 0x1f */ | |
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63 | #define ESIS_ESH 0x02 /* End System Hello */ |
64 | #define ESIS_ISH 0x04 /* Intermediate System Hello */ | |
65 | #define ESIS_RD 0x06 /* Redirect */ | |
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66 | u_char esis_ht_msb; /* holding time (seconds) high byte */ |
67 | u_char esis_ht_lsb; /* holding time (seconds) low byte */ | |
68 | u_char esis_cksum_msb; /* checksum high byte */ | |
69 | u_char esis_cksum_lsb; /* checksum low byte */ | |
70 | }; | |
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71 | /* |
72 | * Values for ESIS datagram options | |
73 | */ | |
74 | #define ESISOVAL_NETMASK 0xe1 /* address mask option, RD PDU only */ | |
75 | #define ESISOVAL_SNPAMASK 0xe2 /* snpa mask option, RD PDU only */ | |
76 | #define ESISOVAL_ESCT 0xc6 /* end system conf. timer, ISH PDU only */ | |
77 | ||
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78 | |
79 | #define ESIS_CKSUM_OFF 0x07 | |
80 | #define ESIS_CKSUM_REQUIRED(pdu)\ | |
81 | ((pdu->esis_cksum_msb != 0) || (pdu->esis_cksum_lsb != 0)) | |
82 | ||
83 | #define ESIS_VERSION 1 | |
84 | ||
85 | struct esis_stat { | |
86 | u_short es_nomem; /* insufficient memory to send hello */ | |
87 | u_short es_badcsum; /* incorrect checksum */ | |
88 | u_short es_badvers; /* incorrect version number */ | |
89 | u_short es_badtype; /* unknown pdu type field */ | |
90 | u_short es_toosmall; /* packet too small */ | |
91 | u_short es_eshsent; /* ESH sent */ | |
92 | u_short es_eshrcvd; /* ESH rcvd */ | |
93 | u_short es_ishsent; /* ISH sent */ | |
94 | u_short es_ishrcvd; /* ISH rcvd */ | |
95 | u_short es_rdsent; /* RD sent */ | |
96 | u_short es_rdrcvd; /* RD rcvd */ | |
97 | }; | |
98 | ||
99 | #ifdef KERNEL | |
100 | struct esis_stat esis_stat; | |
101 | #endif KERNEL |