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 } 155