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