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 1.6 2017/01/24 23:29:14 christos Exp $"); 27 #endif 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <netdissect-stdinc.h> 34 35 #include "netdissect.h" 36 #include "extract.h" 37 38 /* Cisco IGRP definitions */ 39 40 /* IGRP Header */ 41 42 struct igrphdr { 43 uint8_t ig_vop; /* protocol version number / opcode */ 44 #define IGRP_V(x) (((x) & 0xf0) >> 4) 45 #define IGRP_OP(x) ((x) & 0x0f) 46 uint8_t ig_ed; /* edition number */ 47 uint16_t ig_as; /* autonomous system number */ 48 uint16_t ig_ni; /* number of subnet in local net */ 49 uint16_t ig_ns; /* number of networks in AS */ 50 uint16_t ig_nx; /* number of networks ouside AS */ 51 uint16_t ig_sum; /* checksum of IGRP header & data */ 52 }; 53 54 #define IGRP_UPDATE 1 55 #define IGRP_REQUEST 2 56 57 /* IGRP routing entry */ 58 59 struct igrprte { 60 uint8_t igr_net[3]; /* 3 significant octets of IP address */ 61 uint8_t igr_dly[3]; /* delay in tens of microseconds */ 62 uint8_t igr_bw[3]; /* bandwidth in units of 1 kb/s */ 63 uint8_t igr_mtu[2]; /* MTU in octets */ 64 uint8_t igr_rel; /* percent packets successfully tx/rx */ 65 uint8_t igr_ld; /* percent of channel occupied */ 66 uint8_t igr_hct; /* hop count */ 67 }; 68 69 #define IGRP_RTE_SIZE 14 /* don't believe sizeof ! */ 70 71 static void 72 igrp_entry_print(netdissect_options *ndo, register const struct igrprte *igr, 73 register int is_interior, register int is_exterior) 74 { 75 register u_int delay, bandwidth; 76 u_int metric, mtu; 77 78 if (is_interior) 79 ND_PRINT((ndo, " *.%d.%d.%d", igr->igr_net[0], 80 igr->igr_net[1], igr->igr_net[2])); 81 else if (is_exterior) 82 ND_PRINT((ndo, " X%d.%d.%d.0", igr->igr_net[0], 83 igr->igr_net[1], igr->igr_net[2])); 84 else 85 ND_PRINT((ndo, " %d.%d.%d.0", igr->igr_net[0], 86 igr->igr_net[1], igr->igr_net[2])); 87 88 delay = EXTRACT_24BITS(igr->igr_dly); 89 bandwidth = EXTRACT_24BITS(igr->igr_bw); 90 metric = bandwidth + delay; 91 if (metric > 0xffffff) 92 metric = 0xffffff; 93 mtu = EXTRACT_16BITS(igr->igr_mtu); 94 95 ND_PRINT((ndo, " d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops", 96 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth, 97 igr->igr_rel, igr->igr_ld, metric, 98 mtu, igr->igr_hct)); 99 } 100 101 static const struct tok op2str[] = { 102 { IGRP_UPDATE, "update" }, 103 { IGRP_REQUEST, "request" }, 104 { 0, NULL } 105 }; 106 107 void 108 igrp_print(netdissect_options *ndo, register const u_char *bp, u_int length) 109 { 110 register const struct igrphdr *hdr; 111 register const u_char *cp; 112 u_int nint, nsys, next; 113 114 hdr = (const struct igrphdr *)bp; 115 cp = (const u_char *)(hdr + 1); 116 ND_PRINT((ndo, "igrp:")); 117 118 /* Header */ 119 ND_TCHECK(*hdr); 120 nint = EXTRACT_16BITS(&hdr->ig_ni); 121 nsys = EXTRACT_16BITS(&hdr->ig_ns); 122 next = EXTRACT_16BITS(&hdr->ig_nx); 123 124 ND_PRINT((ndo, " %s V%d edit=%d AS=%d (%d/%d/%d)", 125 tok2str(op2str, "op-#%d", IGRP_OP(hdr->ig_vop)), 126 IGRP_V(hdr->ig_vop), 127 hdr->ig_ed, 128 EXTRACT_16BITS(&hdr->ig_as), 129 nint, 130 nsys, 131 next)); 132 133 length -= sizeof(*hdr); 134 while (length >= IGRP_RTE_SIZE) { 135 if (nint > 0) { 136 ND_TCHECK2(*cp, IGRP_RTE_SIZE); 137 igrp_entry_print(ndo, (const struct igrprte *)cp, 1, 0); 138 --nint; 139 } else if (nsys > 0) { 140 ND_TCHECK2(*cp, IGRP_RTE_SIZE); 141 igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 0); 142 --nsys; 143 } else if (next > 0) { 144 ND_TCHECK2(*cp, IGRP_RTE_SIZE); 145 igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 1); 146 --next; 147 } else { 148 ND_PRINT((ndo, " [extra bytes %d]", length)); 149 break; 150 } 151 cp += IGRP_RTE_SIZE; 152 length -= IGRP_RTE_SIZE; 153 } 154 if (nint == 0 && nsys == 0 && next == 0) 155 return; 156 trunc: 157 ND_PRINT((ndo, " [|igrp]")); 158 } 159