/*
* 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 ([email protected])
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-igrp.c,v 1.9 2024/09/02 16:15:31 christos Exp $");
#endif

/* \summary: Interior Gateway Routing Protocol (IGRP) printer */

#include <config.h>

#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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