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1 office 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  
24 #define NETDISSECT_REWORKED
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28  
29 #include <tcpdump-stdinc.h>
30  
31 #include "interface.h"
32 #include "extract.h" /* must come after interface.h */
33  
34 /* Cisco IGRP definitions */
35  
36 /* IGRP Header */
37  
38 struct igrphdr {
39 uint8_t ig_vop; /* protocol version number / opcode */
40 #define IGRP_V(x) (((x) & 0xf0) >> 4)
41 #define IGRP_OP(x) ((x) & 0x0f)
42 uint8_t ig_ed; /* edition number */
43 uint16_t ig_as; /* autonomous system number */
44 uint16_t ig_ni; /* number of subnet in local net */
45 uint16_t ig_ns; /* number of networks in AS */
46 uint16_t ig_nx; /* number of networks ouside AS */
47 uint16_t ig_sum; /* checksum of IGRP header & data */
48 };
49  
50 #define IGRP_UPDATE 1
51 #define IGRP_REQUEST 2
52  
53 /* IGRP routing entry */
54  
55 struct igrprte {
56 uint8_t igr_net[3]; /* 3 significant octets of IP address */
57 uint8_t igr_dly[3]; /* delay in tens of microseconds */
58 uint8_t igr_bw[3]; /* bandwidth in units of 1 kb/s */
59 uint8_t igr_mtu[2]; /* MTU in octets */
60 uint8_t igr_rel; /* percent packets successfully tx/rx */
61 uint8_t igr_ld; /* percent of channel occupied */
62 uint8_t igr_hct; /* hop count */
63 };
64  
65 #define IGRP_RTE_SIZE 14 /* don't believe sizeof ! */
66  
67 static void
68 igrp_entry_print(netdissect_options *ndo, register struct igrprte *igr,
69 register int is_interior, register int is_exterior)
70 {
71 register u_int delay, bandwidth;
72 u_int metric, mtu;
73  
74 if (is_interior)
75 ND_PRINT((ndo, " *.%d.%d.%d", igr->igr_net[0],
76 igr->igr_net[1], igr->igr_net[2]));
77 else if (is_exterior)
78 ND_PRINT((ndo, " X%d.%d.%d.0", igr->igr_net[0],
79 igr->igr_net[1], igr->igr_net[2]));
80 else
81 ND_PRINT((ndo, " %d.%d.%d.0", igr->igr_net[0],
82 igr->igr_net[1], igr->igr_net[2]));
83  
84 delay = EXTRACT_24BITS(igr->igr_dly);
85 bandwidth = EXTRACT_24BITS(igr->igr_bw);
86 metric = bandwidth + delay;
87 if (metric > 0xffffff)
88 metric = 0xffffff;
89 mtu = EXTRACT_16BITS(igr->igr_mtu);
90  
91 ND_PRINT((ndo, " d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops",
92 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth,
93 igr->igr_rel, igr->igr_ld, metric,
94 mtu, igr->igr_hct));
95 }
96  
97 static const struct tok op2str[] = {
98 { IGRP_UPDATE, "update" },
99 { IGRP_REQUEST, "request" },
100 { 0, NULL }
101 };
102  
103 void
104 igrp_print(netdissect_options *ndo, register const u_char *bp, u_int length)
105 {
106 register struct igrphdr *hdr;
107 register u_char *cp;
108 u_int nint, nsys, next;
109  
110 hdr = (struct igrphdr *)bp;
111 cp = (u_char *)(hdr + 1);
112 ND_PRINT((ndo, "igrp:"));
113  
114 /* Header */
115 ND_TCHECK(*hdr);
116 nint = EXTRACT_16BITS(&hdr->ig_ni);
117 nsys = EXTRACT_16BITS(&hdr->ig_ns);
118 next = EXTRACT_16BITS(&hdr->ig_nx);
119  
120 ND_PRINT((ndo, " %s V%d edit=%d AS=%d (%d/%d/%d)",
121 tok2str(op2str, "op-#%d", IGRP_OP(hdr->ig_vop)),
122 IGRP_V(hdr->ig_vop),
123 hdr->ig_ed,
124 EXTRACT_16BITS(&hdr->ig_as),
125 nint,
126 nsys,
127 next));
128  
129 length -= sizeof(*hdr);
130 while (length >= IGRP_RTE_SIZE) {
131 if (nint > 0) {
132 ND_TCHECK2(*cp, IGRP_RTE_SIZE);
133 igrp_entry_print(ndo, (struct igrprte *)cp, 1, 0);
134 --nint;
135 } else if (nsys > 0) {
136 ND_TCHECK2(*cp, IGRP_RTE_SIZE);
137 igrp_entry_print(ndo, (struct igrprte *)cp, 0, 0);
138 --nsys;
139 } else if (next > 0) {
140 ND_TCHECK2(*cp, IGRP_RTE_SIZE);
141 igrp_entry_print(ndo, (struct igrprte *)cp, 0, 1);
142 --next;
143 } else {
144 ND_PRINT((ndo, " [extra bytes %d]", length));
145 break;
146 }
147 cp += IGRP_RTE_SIZE;
148 length -= IGRP_RTE_SIZE;
149 }
150 if (nint == 0 && nsys == 0 && next == 0)
151 return;
152 trunc:
153 ND_PRINT((ndo, " [|igrp]"));
154 }