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 /* \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 nd_uint8_t ig_vop; /* protocol version number / opcode */ 41 #define IGRP_V(x) (((x) & 0xf0) >> 4) 42 #define IGRP_OP(x) ((x) & 0x0f) 43 nd_uint8_t ig_ed; /* edition number */ 44 nd_uint16_t ig_as; /* autonomous system number */ 45 nd_uint16_t ig_ni; /* number of subnet in local net */ 46 nd_uint16_t ig_ns; /* number of networks in AS */ 47 nd_uint16_t ig_nx; /* number of networks ouside AS */ 48 nd_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 nd_byte igr_net[3]; /* 3 significant octets of IP address */ 58 nd_uint24_t igr_dly; /* delay in tens of microseconds */ 59 nd_uint24_t igr_bw; /* bandwidth in units of 1 kb/s */ 60 nd_uint16_t igr_mtu; /* MTU in octets */ 61 nd_uint8_t igr_rel; /* percent packets successfully tx/rx */ 62 nd_uint8_t igr_ld; /* percent of channel occupied */ 63 nd_uint8_t igr_hct; /* hop count */ 64 }; 65 66 #define IGRP_RTE_SIZE 14 /* sizeof() is accurate now */ 67 68 static void 69 igrp_entry_print(netdissect_options *ndo, const struct igrprte *igr) 70 { 71 u_int delay, bandwidth; 72 u_int metric, mtu; 73 74 delay = GET_BE_U_3(igr->igr_dly); 75 bandwidth = GET_BE_U_3(igr->igr_bw); 76 metric = ND_MIN(bandwidth + delay, 0xffffff); 77 mtu = GET_BE_U_2(igr->igr_mtu); 78 79 ND_PRINT(" d=%u b=%u r=%u l=%u M=%u mtu=%u in %u hops", 80 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth, 81 GET_U_1(igr->igr_rel), GET_U_1(igr->igr_ld), metric, 82 mtu, GET_U_1(igr->igr_hct)); 83 } 84 85 static const struct tok op2str[] = { 86 { IGRP_UPDATE, "update" }, 87 { IGRP_REQUEST, "request" }, 88 { 0, NULL } 89 }; 90 91 void 92 igrp_print(netdissect_options *ndo, const u_char *bp, u_int length) 93 { 94 const struct igrphdr *hdr; 95 const u_char *cp; 96 u_int nint, nsys, next; 97 uint16_t cksum; 98 99 ndo->ndo_protocol = "igrp"; 100 hdr = (const struct igrphdr *)bp; 101 cp = (const u_char *)(hdr + 1); 102 ND_PRINT("igrp:"); 103 104 /* Header */ 105 nint = GET_BE_U_2(hdr->ig_ni); 106 nsys = GET_BE_U_2(hdr->ig_ns); 107 next = GET_BE_U_2(hdr->ig_nx); 108 109 ND_PRINT(" %s V%u edit=%u AS=%u (%u/%u/%u)", 110 tok2str(op2str, "op-#%u", IGRP_OP(GET_U_1(hdr->ig_vop))), 111 IGRP_V(GET_U_1(hdr->ig_vop)), 112 GET_U_1(hdr->ig_ed), 113 GET_BE_U_2(hdr->ig_as), 114 nint, 115 nsys, 116 next); 117 cksum = GET_BE_U_2(hdr->ig_sum); 118 if (ndo->ndo_vflag) 119 ND_PRINT(" checksum=0x%04x", cksum); 120 121 length -= sizeof(*hdr); 122 while (length >= IGRP_RTE_SIZE) { 123 const struct igrprte *igr = (const struct igrprte *)cp; 124 uint8_t net0 = GET_U_1(&igr->igr_net[0]); 125 uint8_t net1 = GET_U_1(&igr->igr_net[1]); 126 uint8_t net2 = GET_U_1(&igr->igr_net[2]); 127 128 if (nint > 0) { 129 ND_PRINT(" *.%u.%u.%u", net0, net1, net2); 130 igrp_entry_print(ndo, igr); 131 --nint; 132 } else if (nsys > 0) { 133 ND_PRINT(" %u.%u.%u.0", net0, net1, net2); 134 igrp_entry_print(ndo, igr); 135 --nsys; 136 } else if (next > 0) { 137 ND_PRINT(" X%u.%u.%u.0", net0, net1, net2); 138 igrp_entry_print(ndo, igr); 139 --next; 140 } else { 141 ND_PRINT(" [extra bytes %u]", length); 142 break; 143 } 144 cp += IGRP_RTE_SIZE; 145 length -= IGRP_RTE_SIZE; 146 } 147 if (nint || nsys || next || length) 148 nd_print_invalid(ndo); 149 } 150