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 /* \summary: Interior Gateway Routing Protocol (IGRP) printer */
25
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29
30 #include <netdissect-stdinc.h>
31
32 #include "netdissect.h"
33 #include "extract.h"
34
35 /* Cisco IGRP definitions */
36
37 /* IGRP Header */
38
39 struct igrphdr {
40 uint8_t ig_vop; /* protocol version number / opcode */
41 #define IGRP_V(x) (((x) & 0xf0) >> 4)
42 #define IGRP_OP(x) ((x) & 0x0f)
43 uint8_t ig_ed; /* edition number */
44 uint16_t ig_as; /* autonomous system number */
45 uint16_t ig_ni; /* number of subnet in local net */
46 uint16_t ig_ns; /* number of networks in AS */
47 uint16_t ig_nx; /* number of networks ouside AS */
48 uint16_t ig_sum; /* checksum of IGRP header & data */
49 };
50
51 #define IGRP_UPDATE 1
52 #define IGRP_REQUEST 2
53
54 /* IGRP routing entry */
55
56 struct igrprte {
57 uint8_t igr_net[3]; /* 3 significant octets of IP address */
58 uint8_t igr_dly[3]; /* delay in tens of microseconds */
59 uint8_t igr_bw[3]; /* bandwidth in units of 1 kb/s */
60 uint8_t igr_mtu[2]; /* MTU in octets */
61 uint8_t igr_rel; /* percent packets successfully tx/rx */
62 uint8_t igr_ld; /* percent of channel occupied */
63 uint8_t igr_hct; /* hop count */
64 };
65
66 #define IGRP_RTE_SIZE 14 /* don't believe sizeof ! */
67
68 static void
igrp_entry_print(netdissect_options * ndo,register const struct igrprte * igr,register int is_interior,register int is_exterior)69 igrp_entry_print(netdissect_options *ndo, register const struct igrprte *igr,
70 register int is_interior, register int is_exterior)
71 {
72 register u_int delay, bandwidth;
73 u_int metric, mtu;
74
75 if (is_interior)
76 ND_PRINT((ndo, " *.%d.%d.%d", igr->igr_net[0],
77 igr->igr_net[1], igr->igr_net[2]));
78 else if (is_exterior)
79 ND_PRINT((ndo, " X%d.%d.%d.0", igr->igr_net[0],
80 igr->igr_net[1], igr->igr_net[2]));
81 else
82 ND_PRINT((ndo, " %d.%d.%d.0", igr->igr_net[0],
83 igr->igr_net[1], igr->igr_net[2]));
84
85 delay = EXTRACT_24BITS(igr->igr_dly);
86 bandwidth = EXTRACT_24BITS(igr->igr_bw);
87 metric = bandwidth + delay;
88 if (metric > 0xffffff)
89 metric = 0xffffff;
90 mtu = EXTRACT_16BITS(igr->igr_mtu);
91
92 ND_PRINT((ndo, " d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops",
93 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth,
94 igr->igr_rel, igr->igr_ld, metric,
95 mtu, igr->igr_hct));
96 }
97
98 static const struct tok op2str[] = {
99 { IGRP_UPDATE, "update" },
100 { IGRP_REQUEST, "request" },
101 { 0, NULL }
102 };
103
104 void
igrp_print(netdissect_options * ndo,register const u_char * bp,u_int length)105 igrp_print(netdissect_options *ndo, register const u_char *bp, u_int length)
106 {
107 register const struct igrphdr *hdr;
108 register const u_char *cp;
109 u_int nint, nsys, next;
110
111 hdr = (const struct igrphdr *)bp;
112 cp = (const u_char *)(hdr + 1);
113 ND_PRINT((ndo, "igrp:"));
114
115 /* Header */
116 ND_TCHECK(*hdr);
117 nint = EXTRACT_16BITS(&hdr->ig_ni);
118 nsys = EXTRACT_16BITS(&hdr->ig_ns);
119 next = EXTRACT_16BITS(&hdr->ig_nx);
120
121 ND_PRINT((ndo, " %s V%d edit=%d AS=%d (%d/%d/%d)",
122 tok2str(op2str, "op-#%d", IGRP_OP(hdr->ig_vop)),
123 IGRP_V(hdr->ig_vop),
124 hdr->ig_ed,
125 EXTRACT_16BITS(&hdr->ig_as),
126 nint,
127 nsys,
128 next));
129
130 length -= sizeof(*hdr);
131 while (length >= IGRP_RTE_SIZE) {
132 if (nint > 0) {
133 ND_TCHECK2(*cp, IGRP_RTE_SIZE);
134 igrp_entry_print(ndo, (const struct igrprte *)cp, 1, 0);
135 --nint;
136 } else if (nsys > 0) {
137 ND_TCHECK2(*cp, IGRP_RTE_SIZE);
138 igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 0);
139 --nsys;
140 } else if (next > 0) {
141 ND_TCHECK2(*cp, IGRP_RTE_SIZE);
142 igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 1);
143 --next;
144 } else {
145 ND_PRINT((ndo, " [extra bytes %d]", length));
146 break;
147 }
148 cp += IGRP_RTE_SIZE;
149 length -= IGRP_RTE_SIZE;
150 }
151 if (nint == 0 && nsys == 0 && next == 0)
152 return;
153 trunc:
154 ND_PRINT((ndo, " [|igrp]"));
155 }
156