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c8cf0f94 PA |
1 | /* |
2 | * Copyright (c) 1996, 1997 | |
3 | * The Regents of the University of California. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that: (1) source code distributions | |
7 | * retain the above copyright notice and this paragraph in its entirety, (2) | |
8 | * distributions including binary code include the above copyright notice and | |
9 | * this paragraph in its entirety in the documentation or other materials | |
10 | * provided with the distribution, and (3) all advertising materials mentioning | |
11 | * features or use of this software display the following acknowledgement: | |
12 | * ``This product includes software developed by the University of California, | |
13 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of | |
14 | * the University nor the names of its contributors may be used to endorse | |
15 | * or promote products derived from this software without specific prior | |
16 | * written permission. | |
17 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED | |
18 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF | |
19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
20 | * | |
21 | * Initial contribution from Francis Dupont (francis.dupont@inria.fr) | |
22 | */ | |
23 | ||
411677ae | 24 | /* \summary: Interior Gateway Routing Protocol (IGRP) printer */ |
c8cf0f94 PA |
25 | |
26 | #ifdef HAVE_CONFIG_H | |
ed775ee7 | 27 | #include <config.h> |
c8cf0f94 PA |
28 | #endif |
29 | ||
ed775ee7 | 30 | #include "netdissect-stdinc.h" |
411677ae AL |
31 | |
32 | #include "netdissect.h" | |
33 | #include "extract.h" | |
34 | ||
35 | /* Cisco IGRP definitions */ | |
c8cf0f94 | 36 | |
411677ae AL |
37 | /* IGRP Header */ |
38 | ||
39 | struct igrphdr { | |
ed775ee7 | 40 | nd_uint8_t ig_vop; /* protocol version number / opcode */ |
411677ae AL |
41 | #define IGRP_V(x) (((x) & 0xf0) >> 4) |
42 | #define IGRP_OP(x) ((x) & 0x0f) | |
ed775ee7 AHJ |
43 | nd_uint8_t ig_ed; /* edition number */ |
44 | nd_uint16_t ig_as; /* autonomous system number */ | |
45 | nd_uint16_t ig_ni; /* number of subnet in local net */ | |
46 | nd_uint16_t ig_ns; /* number of networks in AS */ | |
47 | nd_uint16_t ig_nx; /* number of networks ouside AS */ | |
48 | nd_uint16_t ig_sum; /* checksum of IGRP header & data */ | |
411677ae AL |
49 | }; |
50 | ||
51 | #define IGRP_UPDATE 1 | |
52 | #define IGRP_REQUEST 2 | |
53 | ||
54 | /* IGRP routing entry */ | |
55 | ||
56 | struct igrprte { | |
ed775ee7 AHJ |
57 | nd_byte igr_net[3]; /* 3 significant octets of IP address */ |
58 | nd_uint24_t igr_dly; /* delay in tens of microseconds */ | |
59 | nd_uint24_t igr_bw; /* bandwidth in units of 1 kb/s */ | |
60 | nd_uint16_t igr_mtu; /* MTU in octets */ | |
61 | nd_uint8_t igr_rel; /* percent packets successfully tx/rx */ | |
62 | nd_uint8_t igr_ld; /* percent of channel occupied */ | |
63 | nd_uint8_t igr_hct; /* hop count */ | |
411677ae | 64 | }; |
c8cf0f94 | 65 | |
ed775ee7 | 66 | #define IGRP_RTE_SIZE 14 /* sizeof() is accurate now */ |
c8cf0f94 PA |
67 | |
68 | static void | |
ed775ee7 | 69 | igrp_entry_print(netdissect_options *ndo, const struct igrprte *igr) |
c8cf0f94 | 70 | { |
ed775ee7 | 71 | u_int delay, bandwidth; |
c8cf0f94 PA |
72 | u_int metric, mtu; |
73 | ||
ed775ee7 AHJ |
74 | delay = GET_BE_U_3(igr->igr_dly); |
75 | bandwidth = GET_BE_U_3(igr->igr_bw); | |
76 | metric = ND_MIN(bandwidth + delay, 0xffffff); | |
77 | mtu = GET_BE_U_2(igr->igr_mtu); | |
78 | ||
79 | ND_PRINT(" d=%u b=%u r=%u l=%u M=%u mtu=%u in %u hops", | |
c8cf0f94 | 80 | 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth, |
ed775ee7 AHJ |
81 | GET_U_1(igr->igr_rel), GET_U_1(igr->igr_ld), metric, |
82 | mtu, GET_U_1(igr->igr_hct)); | |
c8cf0f94 PA |
83 | } |
84 | ||
411677ae | 85 | static const struct tok op2str[] = { |
c8cf0f94 PA |
86 | { IGRP_UPDATE, "update" }, |
87 | { IGRP_REQUEST, "request" }, | |
88 | { 0, NULL } | |
89 | }; | |
90 | ||
91 | void | |
ed775ee7 | 92 | igrp_print(netdissect_options *ndo, const u_char *bp, u_int length) |
c8cf0f94 | 93 | { |
ed775ee7 AHJ |
94 | const struct igrphdr *hdr; |
95 | const u_char *cp; | |
c8cf0f94 | 96 | u_int nint, nsys, next; |
ed775ee7 | 97 | uint16_t cksum; |
c8cf0f94 | 98 | |
ed775ee7 | 99 | ndo->ndo_protocol = "igrp"; |
411677ae AL |
100 | hdr = (const struct igrphdr *)bp; |
101 | cp = (const u_char *)(hdr + 1); | |
ed775ee7 | 102 | ND_PRINT("igrp:"); |
c8cf0f94 PA |
103 | |
104 | /* Header */ | |
ed775ee7 AHJ |
105 | nint = GET_BE_U_2(hdr->ig_ni); |
106 | nsys = GET_BE_U_2(hdr->ig_ns); | |
107 | next = GET_BE_U_2(hdr->ig_nx); | |
108 | ||
109 | ND_PRINT(" %s V%u edit=%u AS=%u (%u/%u/%u)", | |
110 | tok2str(op2str, "op-#%u", IGRP_OP(GET_U_1(hdr->ig_vop))), | |
111 | IGRP_V(GET_U_1(hdr->ig_vop)), | |
112 | GET_U_1(hdr->ig_ed), | |
113 | GET_BE_U_2(hdr->ig_as), | |
c8cf0f94 PA |
114 | nint, |
115 | nsys, | |
ed775ee7 AHJ |
116 | next); |
117 | cksum = GET_BE_U_2(hdr->ig_sum); | |
118 | if (ndo->ndo_vflag) | |
119 | ND_PRINT(" checksum=0x%04x", cksum); | |
c8cf0f94 PA |
120 | |
121 | length -= sizeof(*hdr); | |
122 | while (length >= IGRP_RTE_SIZE) { | |
ed775ee7 AHJ |
123 | const struct igrprte *igr = (const struct igrprte *)cp; |
124 | uint8_t net0 = GET_U_1(&igr->igr_net[0]); | |
125 | uint8_t net1 = GET_U_1(&igr->igr_net[1]); | |
126 | uint8_t net2 = GET_U_1(&igr->igr_net[2]); | |
127 | ||
c8cf0f94 | 128 | if (nint > 0) { |
ed775ee7 AHJ |
129 | ND_PRINT(" *.%u.%u.%u", net0, net1, net2); |
130 | igrp_entry_print(ndo, igr); | |
c8cf0f94 PA |
131 | --nint; |
132 | } else if (nsys > 0) { | |
ed775ee7 AHJ |
133 | ND_PRINT(" %u.%u.%u.0", net0, net1, net2); |
134 | igrp_entry_print(ndo, igr); | |
c8cf0f94 PA |
135 | --nsys; |
136 | } else if (next > 0) { | |
ed775ee7 AHJ |
137 | ND_PRINT(" X%u.%u.%u.0", net0, net1, net2); |
138 | igrp_entry_print(ndo, igr); | |
c8cf0f94 PA |
139 | --next; |
140 | } else { | |
ed775ee7 | 141 | ND_PRINT(" [extra bytes %u]", length); |
c8cf0f94 PA |
142 | break; |
143 | } | |
144 | cp += IGRP_RTE_SIZE; | |
145 | length -= IGRP_RTE_SIZE; | |
146 | } | |
ed775ee7 AHJ |
147 | if (nint || nsys || next || length) |
148 | nd_print_invalid(ndo); | |
c8cf0f94 | 149 | } |