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 #include <config.h> 27 28 #include "netdissect-stdinc.h" 29 30 #include "netdissect.h" 31 #include "extract.h" 32 33 /* Cisco IGRP definitions */ 34 35 /* IGRP Header */ 36 37 struct igrphdr { 38 nd_uint8_t ig_vop; /* protocol version number / opcode */ 39 #define IGRP_V(x) (((x) & 0xf0) >> 4) 40 #define IGRP_OP(x) ((x) & 0x0f) 41 nd_uint8_t ig_ed; /* edition number */ 42 nd_uint16_t ig_as; /* autonomous system number */ 43 nd_uint16_t ig_ni; /* number of subnet in local net */ 44 nd_uint16_t ig_ns; /* number of networks in AS */ 45 nd_uint16_t ig_nx; /* number of networks outside AS */ 46 nd_uint16_t ig_sum; /* checksum of IGRP header & data */ 47 }; 48 49 #define IGRP_UPDATE 1 50 #define IGRP_REQUEST 2 51 52 /* IGRP routing entry */ 53 54 struct igrprte { 55 nd_byte igr_net[3]; /* 3 significant octets of IP address */ 56 nd_uint24_t igr_dly; /* delay in tens of microseconds */ 57 nd_uint24_t igr_bw; /* bandwidth in units of 1 kb/s */ 58 nd_uint16_t igr_mtu; /* MTU in octets */ 59 nd_uint8_t igr_rel; /* percent packets successfully tx/rx */ 60 nd_uint8_t igr_ld; /* percent of channel occupied */ 61 nd_uint8_t igr_hct; /* hop count */ 62 }; 63 64 #define IGRP_RTE_SIZE 14 /* sizeof() is accurate now */ 65 66 static void 67 igrp_entry_print(netdissect_options *ndo, const struct igrprte *igr) 68 { 69 u_int delay, bandwidth; 70 u_int metric, mtu; 71 72 delay = GET_BE_U_3(igr->igr_dly); 73 bandwidth = GET_BE_U_3(igr->igr_bw); 74 metric = ND_MIN(bandwidth + delay, 0xffffff); 75 mtu = GET_BE_U_2(igr->igr_mtu); 76 77 ND_PRINT(" d=%u b=%u r=%u l=%u M=%u mtu=%u in %u hops", 78 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth, 79 GET_U_1(igr->igr_rel), GET_U_1(igr->igr_ld), metric, 80 mtu, GET_U_1(igr->igr_hct)); 81 } 82 83 static const struct tok op2str[] = { 84 { IGRP_UPDATE, "update" }, 85 { IGRP_REQUEST, "request" }, 86 { 0, NULL } 87 }; 88 89 void 90 igrp_print(netdissect_options *ndo, const u_char *bp, u_int length) 91 { 92 const struct igrphdr *hdr; 93 const u_char *cp; 94 u_int nint, nsys, next; 95 uint16_t cksum; 96 97 ndo->ndo_protocol = "igrp"; 98 hdr = (const struct igrphdr *)bp; 99 cp = (const u_char *)(hdr + 1); 100 ND_PRINT("igrp:"); 101 102 /* Header */ 103 nint = GET_BE_U_2(hdr->ig_ni); 104 nsys = GET_BE_U_2(hdr->ig_ns); 105 next = GET_BE_U_2(hdr->ig_nx); 106 107 ND_PRINT(" %s V%u edit=%u AS=%u (%u/%u/%u)", 108 tok2str(op2str, "op-#%u", IGRP_OP(GET_U_1(hdr->ig_vop))), 109 IGRP_V(GET_U_1(hdr->ig_vop)), 110 GET_U_1(hdr->ig_ed), 111 GET_BE_U_2(hdr->ig_as), 112 nint, 113 nsys, 114 next); 115 cksum = GET_BE_U_2(hdr->ig_sum); 116 if (ndo->ndo_vflag) 117 ND_PRINT(" checksum=0x%04x", cksum); 118 119 length -= sizeof(*hdr); 120 while (length >= IGRP_RTE_SIZE) { 121 const struct igrprte *igr = (const struct igrprte *)cp; 122 uint8_t net0 = GET_U_1(&igr->igr_net[0]); 123 uint8_t net1 = GET_U_1(&igr->igr_net[1]); 124 uint8_t net2 = GET_U_1(&igr->igr_net[2]); 125 126 if (nint > 0) { 127 ND_PRINT(" *.%u.%u.%u", net0, net1, net2); 128 igrp_entry_print(ndo, igr); 129 --nint; 130 } else if (nsys > 0) { 131 ND_PRINT(" %u.%u.%u.0", net0, net1, net2); 132 igrp_entry_print(ndo, igr); 133 --nsys; 134 } else if (next > 0) { 135 ND_PRINT(" X%u.%u.%u.0", net0, net1, net2); 136 igrp_entry_print(ndo, igr); 137 --next; 138 } else { 139 ND_PRINT(" [extra bytes %u]", length); 140 break; 141 } 142 cp += IGRP_RTE_SIZE; 143 length -= IGRP_RTE_SIZE; 144 } 145 if (nint || nsys || next || length) 146 nd_print_invalid(ndo); 147 } 148