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 1.8 2023/08/17 20:19:40 christos 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 nd_uint8_t ig_vop; /* protocol version number / opcode */ 46 #define IGRP_V(x) (((x) & 0xf0) >> 4) 47 #define IGRP_OP(x) ((x) & 0x0f) 48 nd_uint8_t ig_ed; /* edition number */ 49 nd_uint16_t ig_as; /* autonomous system number */ 50 nd_uint16_t ig_ni; /* number of subnet in local net */ 51 nd_uint16_t ig_ns; /* number of networks in AS */ 52 nd_uint16_t ig_nx; /* number of networks outside AS */ 53 nd_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 nd_byte igr_net[3]; /* 3 significant octets of IP address */ 63 nd_uint24_t igr_dly; /* delay in tens of microseconds */ 64 nd_uint24_t igr_bw; /* bandwidth in units of 1 kb/s */ 65 nd_uint16_t igr_mtu; /* MTU in octets */ 66 nd_uint8_t igr_rel; /* percent packets successfully tx/rx */ 67 nd_uint8_t igr_ld; /* percent of channel occupied */ 68 nd_uint8_t igr_hct; /* hop count */ 69 }; 70 71 #define IGRP_RTE_SIZE 14 /* sizeof() is accurate now */ 72 73 static void 74 igrp_entry_print(netdissect_options *ndo, const struct igrprte *igr) 75 { 76 u_int delay, bandwidth; 77 u_int metric, mtu; 78 79 delay = GET_BE_U_3(igr->igr_dly); 80 bandwidth = GET_BE_U_3(igr->igr_bw); 81 metric = ND_MIN(bandwidth + delay, 0xffffff); 82 mtu = GET_BE_U_2(igr->igr_mtu); 83 84 ND_PRINT(" d=%u b=%u r=%u l=%u M=%u mtu=%u in %u hops", 85 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth, 86 GET_U_1(igr->igr_rel), GET_U_1(igr->igr_ld), metric, 87 mtu, GET_U_1(igr->igr_hct)); 88 } 89 90 static const struct tok op2str[] = { 91 { IGRP_UPDATE, "update" }, 92 { IGRP_REQUEST, "request" }, 93 { 0, NULL } 94 }; 95 96 void 97 igrp_print(netdissect_options *ndo, const u_char *bp, u_int length) 98 { 99 const struct igrphdr *hdr; 100 const u_char *cp; 101 u_int nint, nsys, next; 102 uint16_t cksum; 103 104 ndo->ndo_protocol = "igrp"; 105 hdr = (const struct igrphdr *)bp; 106 cp = (const u_char *)(hdr + 1); 107 ND_PRINT("igrp:"); 108 109 /* Header */ 110 nint = GET_BE_U_2(hdr->ig_ni); 111 nsys = GET_BE_U_2(hdr->ig_ns); 112 next = GET_BE_U_2(hdr->ig_nx); 113 114 ND_PRINT(" %s V%u edit=%u AS=%u (%u/%u/%u)", 115 tok2str(op2str, "op-#%u", IGRP_OP(GET_U_1(hdr->ig_vop))), 116 IGRP_V(GET_U_1(hdr->ig_vop)), 117 GET_U_1(hdr->ig_ed), 118 GET_BE_U_2(hdr->ig_as), 119 nint, 120 nsys, 121 next); 122 cksum = GET_BE_U_2(hdr->ig_sum); 123 if (ndo->ndo_vflag) 124 ND_PRINT(" checksum=0x%04x", cksum); 125 126 length -= sizeof(*hdr); 127 while (length >= IGRP_RTE_SIZE) { 128 const struct igrprte *igr = (const struct igrprte *)cp; 129 uint8_t net0 = GET_U_1(&igr->igr_net[0]); 130 uint8_t net1 = GET_U_1(&igr->igr_net[1]); 131 uint8_t net2 = GET_U_1(&igr->igr_net[2]); 132 133 if (nint > 0) { 134 ND_PRINT(" *.%u.%u.%u", net0, net1, net2); 135 igrp_entry_print(ndo, igr); 136 --nint; 137 } else if (nsys > 0) { 138 ND_PRINT(" %u.%u.%u.0", net0, net1, net2); 139 igrp_entry_print(ndo, igr); 140 --nsys; 141 } else if (next > 0) { 142 ND_PRINT(" X%u.%u.%u.0", net0, net1, net2); 143 igrp_entry_print(ndo, igr); 144 --next; 145 } else { 146 ND_PRINT(" [extra bytes %u]", length); 147 break; 148 } 149 cp += IGRP_RTE_SIZE; 150 length -= IGRP_RTE_SIZE; 151 } 152 if (nint || nsys || next || length) 153 nd_print_invalid(ndo); 154 } 155