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 #include <sys/cdefs.h> 25 #ifndef lint 26 __RCSID("$NetBSD: print-igrp.c,v 1.5 2014/11/20 03:05:03 christos Exp $"); 27 #endif 28 29 #define NETDISSECT_REWORKED 30 #ifdef HAVE_CONFIG_H 31 #include "config.h" 32 #endif 33 34 #include <tcpdump-stdinc.h> 35 36 #include "interface.h" 37 #include "extract.h" /* must come after interface.h */ 38 39 /* Cisco IGRP definitions */ 40 41 /* IGRP Header */ 42 43 struct igrphdr { 44 uint8_t ig_vop; /* protocol version number / opcode */ 45 #define IGRP_V(x) (((x) & 0xf0) >> 4) 46 #define IGRP_OP(x) ((x) & 0x0f) 47 uint8_t ig_ed; /* edition number */ 48 uint16_t ig_as; /* autonomous system number */ 49 uint16_t ig_ni; /* number of subnet in local net */ 50 uint16_t ig_ns; /* number of networks in AS */ 51 uint16_t ig_nx; /* number of networks ouside AS */ 52 uint16_t ig_sum; /* checksum of IGRP header & data */ 53 }; 54 55 #define IGRP_UPDATE 1 56 #define IGRP_REQUEST 2 57 58 /* IGRP routing entry */ 59 60 struct igrprte { 61 uint8_t igr_net[3]; /* 3 significant octets of IP address */ 62 uint8_t igr_dly[3]; /* delay in tens of microseconds */ 63 uint8_t igr_bw[3]; /* bandwidth in units of 1 kb/s */ 64 uint8_t igr_mtu[2]; /* MTU in octets */ 65 uint8_t igr_rel; /* percent packets successfully tx/rx */ 66 uint8_t igr_ld; /* percent of channel occupied */ 67 uint8_t igr_hct; /* hop count */ 68 }; 69 70 #define IGRP_RTE_SIZE 14 /* don't believe sizeof ! */ 71 72 static void 73 igrp_entry_print(netdissect_options *ndo, register struct igrprte *igr, 74 register int is_interior, register int is_exterior) 75 { 76 register u_int delay, bandwidth; 77 u_int metric, mtu; 78 79 if (is_interior) 80 ND_PRINT((ndo, " *.%d.%d.%d", igr->igr_net[0], 81 igr->igr_net[1], igr->igr_net[2])); 82 else if (is_exterior) 83 ND_PRINT((ndo, " X%d.%d.%d.0", igr->igr_net[0], 84 igr->igr_net[1], igr->igr_net[2])); 85 else 86 ND_PRINT((ndo, " %d.%d.%d.0", igr->igr_net[0], 87 igr->igr_net[1], igr->igr_net[2])); 88 89 delay = EXTRACT_24BITS(igr->igr_dly); 90 bandwidth = EXTRACT_24BITS(igr->igr_bw); 91 metric = bandwidth + delay; 92 if (metric > 0xffffff) 93 metric = 0xffffff; 94 mtu = EXTRACT_16BITS(igr->igr_mtu); 95 96 ND_PRINT((ndo, " d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops", 97 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth, 98 igr->igr_rel, igr->igr_ld, metric, 99 mtu, igr->igr_hct)); 100 } 101 102 static const struct tok op2str[] = { 103 { IGRP_UPDATE, "update" }, 104 { IGRP_REQUEST, "request" }, 105 { 0, NULL } 106 }; 107 108 void 109 igrp_print(netdissect_options *ndo, register const u_char *bp, u_int length) 110 { 111 register struct igrphdr *hdr; 112 register u_char *cp; 113 u_int nint, nsys, next; 114 115 hdr = (struct igrphdr *)bp; 116 cp = (u_char *)(hdr + 1); 117 ND_PRINT((ndo, "igrp:")); 118 119 /* Header */ 120 ND_TCHECK(*hdr); 121 nint = EXTRACT_16BITS(&hdr->ig_ni); 122 nsys = EXTRACT_16BITS(&hdr->ig_ns); 123 next = EXTRACT_16BITS(&hdr->ig_nx); 124 125 ND_PRINT((ndo, " %s V%d edit=%d AS=%d (%d/%d/%d)", 126 tok2str(op2str, "op-#%d", IGRP_OP(hdr->ig_vop)), 127 IGRP_V(hdr->ig_vop), 128 hdr->ig_ed, 129 EXTRACT_16BITS(&hdr->ig_as), 130 nint, 131 nsys, 132 next)); 133 134 length -= sizeof(*hdr); 135 while (length >= IGRP_RTE_SIZE) { 136 if (nint > 0) { 137 ND_TCHECK2(*cp, IGRP_RTE_SIZE); 138 igrp_entry_print(ndo, (struct igrprte *)cp, 1, 0); 139 --nint; 140 } else if (nsys > 0) { 141 ND_TCHECK2(*cp, IGRP_RTE_SIZE); 142 igrp_entry_print(ndo, (struct igrprte *)cp, 0, 0); 143 --nsys; 144 } else if (next > 0) { 145 ND_TCHECK2(*cp, IGRP_RTE_SIZE); 146 igrp_entry_print(ndo, (struct igrprte *)cp, 0, 1); 147 --next; 148 } else { 149 ND_PRINT((ndo, " [extra bytes %d]", length)); 150 break; 151 } 152 cp += IGRP_RTE_SIZE; 153 length -= IGRP_RTE_SIZE; 154 } 155 if (nint == 0 && nsys == 0 && next == 0) 156 return; 157 trunc: 158 ND_PRINT((ndo, " [|igrp]")); 159 } 160