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 1.7 2017/02/05 04:05:05 spz Exp $"); 27 #endif 28 29 /* \summary: Interior Gateway Routing Protocol (IGRP) printer */ 30 31 #ifdef HAVE_CONFIG_H 32 #include "config.h" 33 #endif 34 35 #include <netdissect-stdinc.h> 36 37 #include "netdissect.h" 38 #include "extract.h" 39 40 /* Cisco IGRP definitions */ 41 42 /* IGRP Header */ 43 44 struct igrphdr { 45 uint8_t ig_vop; /* protocol version number / opcode */ 46 #define IGRP_V(x) (((x) & 0xf0) >> 4) 47 #define IGRP_OP(x) ((x) & 0x0f) 48 uint8_t ig_ed; /* edition number */ 49 uint16_t ig_as; /* autonomous system number */ 50 uint16_t ig_ni; /* number of subnet in local net */ 51 uint16_t ig_ns; /* number of networks in AS */ 52 uint16_t ig_nx; /* number of networks ouside AS */ 53 uint16_t ig_sum; /* checksum of IGRP header & data */ 54 }; 55 56 #define IGRP_UPDATE 1 57 #define IGRP_REQUEST 2 58 59 /* IGRP routing entry */ 60 61 struct igrprte { 62 uint8_t igr_net[3]; /* 3 significant octets of IP address */ 63 uint8_t igr_dly[3]; /* delay in tens of microseconds */ 64 uint8_t igr_bw[3]; /* bandwidth in units of 1 kb/s */ 65 uint8_t igr_mtu[2]; /* MTU in octets */ 66 uint8_t igr_rel; /* percent packets successfully tx/rx */ 67 uint8_t igr_ld; /* percent of channel occupied */ 68 uint8_t igr_hct; /* hop count */ 69 }; 70 71 #define IGRP_RTE_SIZE 14 /* don't believe sizeof ! */ 72 73 static void 74 igrp_entry_print(netdissect_options *ndo, register const struct igrprte *igr, 75 register int is_interior, register int is_exterior) 76 { 77 register u_int delay, bandwidth; 78 u_int metric, mtu; 79 80 if (is_interior) 81 ND_PRINT((ndo, " *.%d.%d.%d", igr->igr_net[0], 82 igr->igr_net[1], igr->igr_net[2])); 83 else if (is_exterior) 84 ND_PRINT((ndo, " X%d.%d.%d.0", igr->igr_net[0], 85 igr->igr_net[1], igr->igr_net[2])); 86 else 87 ND_PRINT((ndo, " %d.%d.%d.0", igr->igr_net[0], 88 igr->igr_net[1], igr->igr_net[2])); 89 90 delay = EXTRACT_24BITS(igr->igr_dly); 91 bandwidth = EXTRACT_24BITS(igr->igr_bw); 92 metric = bandwidth + delay; 93 if (metric > 0xffffff) 94 metric = 0xffffff; 95 mtu = EXTRACT_16BITS(igr->igr_mtu); 96 97 ND_PRINT((ndo, " d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops", 98 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth, 99 igr->igr_rel, igr->igr_ld, metric, 100 mtu, igr->igr_hct)); 101 } 102 103 static const struct tok op2str[] = { 104 { IGRP_UPDATE, "update" }, 105 { IGRP_REQUEST, "request" }, 106 { 0, NULL } 107 }; 108 109 void 110 igrp_print(netdissect_options *ndo, register const u_char *bp, u_int length) 111 { 112 register const struct igrphdr *hdr; 113 register const u_char *cp; 114 u_int nint, nsys, next; 115 116 hdr = (const struct igrphdr *)bp; 117 cp = (const u_char *)(hdr + 1); 118 ND_PRINT((ndo, "igrp:")); 119 120 /* Header */ 121 ND_TCHECK(*hdr); 122 nint = EXTRACT_16BITS(&hdr->ig_ni); 123 nsys = EXTRACT_16BITS(&hdr->ig_ns); 124 next = EXTRACT_16BITS(&hdr->ig_nx); 125 126 ND_PRINT((ndo, " %s V%d edit=%d AS=%d (%d/%d/%d)", 127 tok2str(op2str, "op-#%d", IGRP_OP(hdr->ig_vop)), 128 IGRP_V(hdr->ig_vop), 129 hdr->ig_ed, 130 EXTRACT_16BITS(&hdr->ig_as), 131 nint, 132 nsys, 133 next)); 134 135 length -= sizeof(*hdr); 136 while (length >= IGRP_RTE_SIZE) { 137 if (nint > 0) { 138 ND_TCHECK2(*cp, IGRP_RTE_SIZE); 139 igrp_entry_print(ndo, (const struct igrprte *)cp, 1, 0); 140 --nint; 141 } else if (nsys > 0) { 142 ND_TCHECK2(*cp, IGRP_RTE_SIZE); 143 igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 0); 144 --nsys; 145 } else if (next > 0) { 146 ND_TCHECK2(*cp, IGRP_RTE_SIZE); 147 igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 1); 148 --next; 149 } else { 150 ND_PRINT((ndo, " [extra bytes %d]", length)); 151 break; 152 } 153 cp += IGRP_RTE_SIZE; 154 length -= IGRP_RTE_SIZE; 155 } 156 if (nint == 0 && nsys == 0 && next == 0) 157 return; 158 trunc: 159 ND_PRINT((ndo, " [|igrp]")); 160 } 161