1996-08-19 20:34:12 +00:00
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/*
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1998-09-15 19:36:32 +00:00
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* Copyright (c) 1996, 1997
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1996-08-19 20:34:12 +00:00
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Initial contribution from Francis Dupont (francis.dupont@inria.fr)
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*/
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2017-01-31 19:17:06 +00:00
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/* \summary: Interior Gateway Routing Protocol (IGRP) printer */
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2000-01-30 00:45:58 +00:00
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#ifdef HAVE_CONFIG_H
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2023-05-10 15:02:34 +00:00
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#include <config.h>
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1996-08-19 20:34:12 +00:00
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#endif
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2023-05-10 15:02:34 +00:00
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#include "netdissect-stdinc.h"
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1996-08-19 20:34:12 +00:00
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2017-01-31 19:17:06 +00:00
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#include "netdissect.h"
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#include "extract.h"
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1996-08-19 20:34:12 +00:00
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2015-01-06 19:03:11 +00:00
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/* Cisco IGRP definitions */
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/* IGRP Header */
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struct igrphdr {
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2023-05-10 15:02:34 +00:00
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nd_uint8_t ig_vop; /* protocol version number / opcode */
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2015-01-06 19:03:11 +00:00
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#define IGRP_V(x) (((x) & 0xf0) >> 4)
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#define IGRP_OP(x) ((x) & 0x0f)
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2023-05-10 15:02:34 +00:00
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nd_uint8_t ig_ed; /* edition number */
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nd_uint16_t ig_as; /* autonomous system number */
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nd_uint16_t ig_ni; /* number of subnet in local net */
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nd_uint16_t ig_ns; /* number of networks in AS */
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nd_uint16_t ig_nx; /* number of networks outside AS */
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nd_uint16_t ig_sum; /* checksum of IGRP header & data */
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2015-01-06 19:03:11 +00:00
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};
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#define IGRP_UPDATE 1
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#define IGRP_REQUEST 2
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/* IGRP routing entry */
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struct igrprte {
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2023-05-10 15:02:34 +00:00
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nd_byte igr_net[3]; /* 3 significant octets of IP address */
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nd_uint24_t igr_dly; /* delay in tens of microseconds */
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nd_uint24_t igr_bw; /* bandwidth in units of 1 kb/s */
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nd_uint16_t igr_mtu; /* MTU in octets */
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nd_uint8_t igr_rel; /* percent packets successfully tx/rx */
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nd_uint8_t igr_ld; /* percent of channel occupied */
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nd_uint8_t igr_hct; /* hop count */
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2015-01-06 19:03:11 +00:00
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};
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2023-05-10 15:02:34 +00:00
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#define IGRP_RTE_SIZE 14 /* sizeof() is accurate now */
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2015-01-06 19:03:11 +00:00
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1996-08-19 20:34:12 +00:00
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static void
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2023-05-10 15:02:34 +00:00
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igrp_entry_print(netdissect_options *ndo, const struct igrprte *igr)
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1996-08-19 20:34:12 +00:00
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{
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2023-05-10 15:02:34 +00:00
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u_int delay, bandwidth;
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1996-08-19 20:34:12 +00:00
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u_int metric, mtu;
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2023-05-10 15:02:34 +00:00
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delay = GET_BE_U_3(igr->igr_dly);
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bandwidth = GET_BE_U_3(igr->igr_bw);
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metric = ND_MIN(bandwidth + delay, 0xffffff);
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mtu = GET_BE_U_2(igr->igr_mtu);
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ND_PRINT(" d=%u b=%u r=%u l=%u M=%u mtu=%u in %u hops",
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1996-08-19 20:34:12 +00:00
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10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth,
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2023-05-10 15:02:34 +00:00
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GET_U_1(igr->igr_rel), GET_U_1(igr->igr_ld), metric,
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mtu, GET_U_1(igr->igr_hct));
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1996-08-19 20:34:12 +00:00
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}
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2015-01-06 19:03:11 +00:00
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static const struct tok op2str[] = {
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1996-08-19 20:34:12 +00:00
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{ IGRP_UPDATE, "update" },
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{ IGRP_REQUEST, "request" },
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{ 0, NULL }
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};
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void
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2023-05-10 15:02:34 +00:00
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igrp_print(netdissect_options *ndo, const u_char *bp, u_int length)
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1996-08-19 20:34:12 +00:00
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{
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2023-05-10 15:02:34 +00:00
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const struct igrphdr *hdr;
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const u_char *cp;
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1996-08-19 20:34:12 +00:00
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u_int nint, nsys, next;
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2023-05-10 15:02:34 +00:00
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uint16_t cksum;
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1996-08-19 20:34:12 +00:00
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2023-05-10 15:02:34 +00:00
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ndo->ndo_protocol = "igrp";
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2017-01-31 19:17:06 +00:00
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hdr = (const struct igrphdr *)bp;
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cp = (const u_char *)(hdr + 1);
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2023-05-10 15:02:34 +00:00
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ND_PRINT("igrp:");
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1996-08-19 20:34:12 +00:00
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/* Header */
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2023-05-10 15:02:34 +00:00
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nint = GET_BE_U_2(hdr->ig_ni);
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nsys = GET_BE_U_2(hdr->ig_ns);
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next = GET_BE_U_2(hdr->ig_nx);
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ND_PRINT(" %s V%u edit=%u AS=%u (%u/%u/%u)",
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tok2str(op2str, "op-#%u", IGRP_OP(GET_U_1(hdr->ig_vop))),
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IGRP_V(GET_U_1(hdr->ig_vop)),
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GET_U_1(hdr->ig_ed),
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GET_BE_U_2(hdr->ig_as),
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1996-08-19 20:34:12 +00:00
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nint,
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nsys,
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2023-05-10 15:02:34 +00:00
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next);
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cksum = GET_BE_U_2(hdr->ig_sum);
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if (ndo->ndo_vflag)
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ND_PRINT(" checksum=0x%04x", cksum);
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1996-08-19 20:34:12 +00:00
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length -= sizeof(*hdr);
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while (length >= IGRP_RTE_SIZE) {
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2023-05-10 15:02:34 +00:00
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const struct igrprte *igr = (const struct igrprte *)cp;
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uint8_t net0 = GET_U_1(&igr->igr_net[0]);
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uint8_t net1 = GET_U_1(&igr->igr_net[1]);
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uint8_t net2 = GET_U_1(&igr->igr_net[2]);
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1996-08-19 20:34:12 +00:00
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if (nint > 0) {
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2023-05-10 15:02:34 +00:00
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ND_PRINT(" *.%u.%u.%u", net0, net1, net2);
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igrp_entry_print(ndo, igr);
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1996-08-19 20:34:12 +00:00
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--nint;
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} else if (nsys > 0) {
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2023-05-10 15:02:34 +00:00
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ND_PRINT(" %u.%u.%u.0", net0, net1, net2);
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igrp_entry_print(ndo, igr);
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1996-08-19 20:34:12 +00:00
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--nsys;
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} else if (next > 0) {
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2023-05-10 15:02:34 +00:00
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ND_PRINT(" X%u.%u.%u.0", net0, net1, net2);
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igrp_entry_print(ndo, igr);
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1996-08-19 20:34:12 +00:00
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--next;
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} else {
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2023-05-10 15:02:34 +00:00
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ND_PRINT(" [extra bytes %u]", length);
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1996-08-19 20:34:12 +00:00
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break;
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}
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cp += IGRP_RTE_SIZE;
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length -= IGRP_RTE_SIZE;
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}
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2023-05-10 15:02:34 +00:00
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if (nint || nsys || next || length)
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nd_print_invalid(ndo);
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1996-08-19 20:34:12 +00:00
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}
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