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 (at) 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 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 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
