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 1.9 2024/09/02 16:15:31 christos Exp $"); 27 #endif 28 29 /* \summary: Interior Gateway Routing Protocol (IGRP) printer */ 30 31 #include <config.h> 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 nd_uint8_t ig_vop; /* protocol version number / opcode */ 44 #define IGRP_V(x) (((x) & 0xf0) >> 4) 45 #define IGRP_OP(x) ((x) & 0x0f) 46 nd_uint8_t ig_ed; /* edition number */ 47 nd_uint16_t ig_as; /* autonomous system number */ 48 nd_uint16_t ig_ni; /* number of subnet in local net */ 49 nd_uint16_t ig_ns; /* number of networks in AS */ 50 nd_uint16_t ig_nx; /* number of networks outside AS */ 51 nd_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 nd_byte igr_net[3]; /* 3 significant octets of IP address */ 61 nd_uint24_t igr_dly; /* delay in tens of microseconds */ 62 nd_uint24_t igr_bw; /* bandwidth in units of 1 kb/s */ 63 nd_uint16_t igr_mtu; /* MTU in octets */ 64 nd_uint8_t igr_rel; /* percent packets successfully tx/rx */ 65 nd_uint8_t igr_ld; /* percent of channel occupied */ 66 nd_uint8_t igr_hct; /* hop count */ 67 }; 68 69 #define IGRP_RTE_SIZE 14 /* sizeof() is accurate now */ 70 71 static void 72 igrp_entry_print(netdissect_options *ndo, const struct igrprte *igr) 73 { 74 u_int delay, bandwidth; 75 u_int metric, mtu; 76 77 delay = GET_BE_U_3(igr->igr_dly); 78 bandwidth = GET_BE_U_3(igr->igr_bw); 79 metric = ND_MIN(bandwidth + delay, 0xffffff); 80 mtu = GET_BE_U_2(igr->igr_mtu); 81 82 ND_PRINT(" d=%u b=%u r=%u l=%u M=%u mtu=%u in %u hops", 83 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth, 84 GET_U_1(igr->igr_rel), GET_U_1(igr->igr_ld), metric, 85 mtu, GET_U_1(igr->igr_hct)); 86 } 87 88 static const struct tok op2str[] = { 89 { IGRP_UPDATE, "update" }, 90 { IGRP_REQUEST, "request" }, 91 { 0, NULL } 92 }; 93 94 void 95 igrp_print(netdissect_options *ndo, const u_char *bp, u_int length) 96 { 97 const struct igrphdr *hdr; 98 const u_char *cp; 99 u_int nint, nsys, next; 100 uint16_t cksum; 101 102 ndo->ndo_protocol = "igrp"; 103 hdr = (const struct igrphdr *)bp; 104 cp = (const u_char *)(hdr + 1); 105 ND_PRINT("igrp:"); 106 107 /* Header */ 108 nint = GET_BE_U_2(hdr->ig_ni); 109 nsys = GET_BE_U_2(hdr->ig_ns); 110 next = GET_BE_U_2(hdr->ig_nx); 111 112 ND_PRINT(" %s V%u edit=%u AS=%u (%u/%u/%u)", 113 tok2str(op2str, "op-#%u", IGRP_OP(GET_U_1(hdr->ig_vop))), 114 IGRP_V(GET_U_1(hdr->ig_vop)), 115 GET_U_1(hdr->ig_ed), 116 GET_BE_U_2(hdr->ig_as), 117 nint, 118 nsys, 119 next); 120 cksum = GET_BE_U_2(hdr->ig_sum); 121 if (ndo->ndo_vflag) 122 ND_PRINT(" checksum=0x%04x", cksum); 123 124 length -= sizeof(*hdr); 125 while (length >= IGRP_RTE_SIZE) { 126 const struct igrprte *igr = (const struct igrprte *)cp; 127 uint8_t net0 = GET_U_1(&igr->igr_net[0]); 128 uint8_t net1 = GET_U_1(&igr->igr_net[1]); 129 uint8_t net2 = GET_U_1(&igr->igr_net[2]); 130 131 if (nint > 0) { 132 ND_PRINT(" *.%u.%u.%u", net0, net1, net2); 133 igrp_entry_print(ndo, igr); 134 --nint; 135 } else if (nsys > 0) { 136 ND_PRINT(" %u.%u.%u.0", net0, net1, net2); 137 igrp_entry_print(ndo, igr); 138 --nsys; 139 } else if (next > 0) { 140 ND_PRINT(" X%u.%u.%u.0", net0, net1, net2); 141 igrp_entry_print(ndo, igr); 142 --next; 143 } else { 144 ND_PRINT(" [extra bytes %u]", length); 145 break; 146 } 147 cp += IGRP_RTE_SIZE; 148 length -= IGRP_RTE_SIZE; 149 } 150 if (nint || nsys || next || length) 151 nd_print_invalid(ndo); 152 } 153