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Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible.  Annotate <sys/param.h> lines with their current reasons.  Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc.  Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution.  These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

/*	$OpenBSD: mroute.c,v 1.23 2015/01/16 06:40:10 deraadt Exp $	*/
/*	$NetBSD: mroute.c,v 1.10 1996/05/11 13:51:27 mycroft Exp $	*/

/*
 * Copyright (c) 1989 Stephen Deering
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Stephen Deering of Stanford University.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)mroute.c	8.1 (Berkeley) 6/6/93
 */

/*
 * Print multicast routing structures and statistics.
 *
 * MROUTING 1.0
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/sysctl.h>

#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/igmp.h>
#define _KERNEL
#include <netinet/ip_mroute.h>
#undef _KERNEL

#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include "netstat.h"

static char *
pktscale(u_long n)
{
	static char buf[8];
	char t;

	if (n < 1024)
		t = ' ';
	else if (n < 1024 * 1024) {
		t = 'k';
		n /= 1024;
	} else {
		t = 'm';
		n /= 1048576;
	}

	snprintf(buf, sizeof buf, "%lu%c", n, t);
	return (buf);
}

void
mroutepr(u_long mfchashtbladdr, u_long mfchashaddr, u_long vifaddr)
{
	u_int mrtproto;
	LIST_HEAD(, mfc) *mfchashtbl;
	u_long mfchash;
	struct vif viftable[MAXVIFS], *v;
	struct mfc *mfcp, mfc;
	vifi_t vifi;
	int mib[] = { CTL_NET, PF_INET, IPPROTO_IP, IPCTL_MRTPROTO };
	size_t len = sizeof(int);
	int i, banner_printed = 0, saved_nflag, numvifs = 0;
	int nmfc;		/* No. of cache entries */

	if (sysctl(mib, sizeof(mib) / sizeof(mib[0]),
	    &mrtproto, &len, NULL, 0) == -1) {
		if (errno != ENOPROTOOPT)
			warn("mroute");
		return;
	}
	switch (mrtproto) {
	case 0:
		printf("no multicast routing compiled into this system\n");
		return;
	case IGMP_DVMRP:
		break;
	default:
		printf("multicast routing protocol %u, unknown\n", mrtproto);
		return;
	}

	if (mfchashtbladdr == 0) {
		printf("mfchashtbl: symbol not in namelist\n");
		return;
	}
	if (mfchashaddr == 0) {
		printf("mfchash: symbol not in namelist\n");
		return;
	}
	if (vifaddr == 0) {
		printf("viftable: symbol not in namelist\n");
		return;
	}

	saved_nflag = nflag;
	nflag = 1;

	kread(vifaddr, &viftable, sizeof(viftable));

	for (vifi = 0, v = viftable; vifi < MAXVIFS; ++vifi, ++v) {
		if (v->v_lcl_addr.s_addr == 0)
			continue;
		numvifs = vifi;

		if (!banner_printed) {
			printf("\nVirtual Interface Table\n %s%s",
			    "Vif  Thresh  Limit  Local-Address    ",
			    "Remote-Address   Pkt_in  Pkt_out\n");
			banner_printed = 1;
		}

		printf(" %3u     %3u  %-15.15s",
		    vifi, v->v_threshold,
		    routename4(v->v_lcl_addr.s_addr));
		printf("  %-15.15s  %6lu  %7lu\n", (v->v_flags & VIFF_TUNNEL) ?
		    routename4(v->v_rmt_addr.s_addr) : "",
		    v->v_pkt_in, v->v_pkt_out);
	}
	if (!banner_printed)
		printf("Virtual Interface Table is empty\n");

	kread(mfchashtbladdr, &mfchashtbl, sizeof(mfchashtbl));
	kread(mfchashaddr, &mfchash, sizeof(mfchash));
	banner_printed = 0;
	nmfc = 0;

	if (mfchashtbl != 0)
		for (i = 0; i <= mfchash; ++i) {
			kread((u_long)&mfchashtbl[i], &mfcp, sizeof(mfcp));

			for (; mfcp != 0; mfcp = LIST_NEXT(&mfc, mfc_hash)) {
				if (!banner_printed) {
					printf("\nMulticast Forwarding Cache\n %s%s",
					    "Hash  Origin           Mcastgroup       ",
					    "Traffic  In-Vif  Out-Vifs/Forw-ttl\n");
					banner_printed = 1;
				}

				kread((u_long)mfcp, &mfc, sizeof(mfc));
				printf("  %3u  %-15.15s",
				    i, routename4(mfc.mfc_origin.s_addr));
				printf("  %-15.15s  %7s     %3u ",
				    routename4(mfc.mfc_mcastgrp.s_addr),
				    pktscale(mfc.mfc_pkt_cnt), mfc.mfc_parent);
				for (vifi = 0; vifi <= numvifs; ++vifi)
					if (mfc.mfc_ttls[vifi])
						printf(" %u/%u", vifi,
						    mfc.mfc_ttls[vifi]);

				printf("\n");

				nmfc++;
			}
		}
	if (!banner_printed)
		printf("Multicast Forwarding Cache is empty\n");
	else
		printf("\nTotal no. of entries in cache: %d\n", nmfc);

	printf("\n");
	nflag = saved_nflag;
}

void
mrt_stats(void)
{
	u_int mrtproto;
	struct mrtstat mrtstat;
	int mib[] = { CTL_NET, PF_INET, IPPROTO_IP, IPCTL_MRTPROTO };
	int mib2[] = { CTL_NET, PF_INET, IPPROTO_IP, IPCTL_MRTSTATS };
	size_t len = sizeof(int);

	if (sysctl(mib, sizeof(mib) / sizeof(mib[0]),
	    &mrtproto, &len, NULL, 0) == -1) {
		if (errno != ENOPROTOOPT)
			warn("mroute");
		return;
	}
	switch (mrtproto) {
	case 0:
		printf("no multicast routing compiled into this system\n");
		return;

	case IGMP_DVMRP:
		break;

	default:
		printf("multicast routing protocol %u, unknown\n", mrtproto);
		return;
	}

	len = sizeof(mrtstat);
	if (sysctl(mib2, sizeof(mib2) / sizeof(mib2[0]),
	    &mrtstat, &len, NULL, 0) == -1) {
		if (errno != ENOPROTOOPT)
			warn("mroute");
		return;
	}

	printf("multicast routing:\n");
	printf("\t%lu datagram%s with no route for origin\n",
	    mrtstat.mrts_no_route, plural(mrtstat.mrts_no_route));
	printf("\t%lu upcall%s made to mrouted\n",
	    mrtstat.mrts_upcalls, plural(mrtstat.mrts_upcalls));
	printf("\t%lu datagram%s with malformed tunnel options\n",
	    mrtstat.mrts_bad_tunnel, plural(mrtstat.mrts_bad_tunnel));
	printf("\t%lu datagram%s with no room for tunnel options\n",
	    mrtstat.mrts_cant_tunnel, plural(mrtstat.mrts_cant_tunnel));
	printf("\t%lu datagram%s arrived on wrong interface\n",
	    mrtstat.mrts_wrong_if, plural(mrtstat.mrts_wrong_if));
	printf("\t%lu datagram%s dropped due to upcall Q overflow\n",
	    mrtstat.mrts_upq_ovflw, plural(mrtstat.mrts_upq_ovflw));
	printf("\t%lu datagram%s dropped due to upcall socket overflow\n",
	    mrtstat.mrts_upq_sockfull, plural(mrtstat.mrts_upq_sockfull));
	printf("\t%lu datagram%s cleaned up by the cache\n",
	    mrtstat.mrts_cache_cleanups, plural(mrtstat.mrts_cache_cleanups));
	printf("\t%lu datagram%s dropped selectively by ratelimiter\n",
	    mrtstat.mrts_drop_sel, plural(mrtstat.mrts_drop_sel));
	printf("\t%lu datagram%s dropped - bucket Q overflow\n",
	    mrtstat.mrts_q_overflow, plural(mrtstat.mrts_q_overflow));
	printf("\t%lu datagram%s dropped - larger than bkt size\n",
	    mrtstat.mrts_pkt2large, plural(mrtstat.mrts_pkt2large));
}