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Make the mbstat preserve the same size which is actually used.  Also
revert the previous that the mbstat is located on the stack.

ok claudio

/*	$OpenBSD: mbuf.c,v 1.45 2023/07/16 03:01:31 yasuoka Exp $	*/
/*	$NetBSD: mbuf.c,v 1.9 1996/05/07 02:55:03 thorpej Exp $	*/

/*
 * Copyright (c) 1983, 1988, 1993
 *	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 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.
 */

#include <sys/socket.h>
#include <sys/queue.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/pool.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <netinet/in.h>

#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "netstat.h"

#define	YES	1
typedef int bool;

struct	mbstat mbstat;
struct kinfo_pool mbpool, mclpools[MCLPOOLS];
int	mclp;
char	*mclnames[] = {
	"mcl2k",
	"mcl2k2",
	"mcl4k",
	"mcl8k",
	"mcl9k",
	"mcl12k",
	"mcl16k",
	"mcl64k"
};
char	**mclnamep = mclnames;

static struct mbtypes {
	int	mt_type;
	char	*mt_name;
} mbtypes[] = {
	{ MT_DATA,	"data" },
	{ MT_OOBDATA,	"oob data" },
	{ MT_CONTROL,	"ancillary data" },
	{ MT_HEADER,	"packet headers" },
	{ MT_FTABLE,	"fragment reassembly queue headers" },	/* XXX */
	{ MT_SONAME,	"socket names and addresses" },
	{ MT_SOOPTS,	"socket options" },
	{ 0, 0 }
};

int nmbtypes = sizeof(mbstat.m_mtypes) / sizeof(u_long);
bool seen[MBSTAT_COUNT];		/* "have we seen this type yet?" */

/*
 * Print mbuf statistics.
 */
void
mbpr(void)
{
	unsigned long totmem, totpeak, totmbufs;
	int i, maxclusters, mib[4], npools;
	struct kinfo_pool pool;
	struct mbtypes *mp;
	size_t size;

	if (nmbtypes != MBSTAT_COUNT) {
		fprintf(stderr,
		    "%s: unexpected change to mbstat; check source\n",
		    __progname);
		return;
	}

	mib[0] = CTL_KERN;
	mib[1] = KERN_MAXCLUSTERS;
	size = sizeof(maxclusters);

	if (sysctl(mib, 2, &maxclusters, &size, NULL, 0) == -1) {
		printf("Can't retrieve value of maxclusters from the "
		    "kernel: %s\n",  strerror(errno));
		return;
	}

	mib[0] = CTL_KERN;
	mib[1] = KERN_MBSTAT;
	size = sizeof(mbstat);

	if (sysctl(mib, 2, &mbstat, &size, NULL, 0) == -1) {
		printf("Can't retrieve mbuf statistics from the kernel: %s\n",
		    strerror(errno));
		return;
	}

	mib[0] = CTL_KERN;
	mib[1] = KERN_POOL;
	mib[2] = KERN_POOL_NPOOLS;
	size = sizeof(npools);

	if (sysctl(mib, 3, &npools, &size, NULL, 0) == -1) {
		printf("Can't figure out number of pools in kernel: %s\n",
		    strerror(errno));
		return;
	}

	for (i = 1; npools; i++) {
		char name[32];

		mib[0] = CTL_KERN;
		mib[1] = KERN_POOL;
		mib[2] = KERN_POOL_POOL;
		mib[3] = i;
		size = sizeof(pool);
		if (sysctl(mib, 4, &pool, &size, NULL, 0) == -1) {
			if (errno == ENOENT)
				continue;
			printf("error getting pool: %s\n",
			    strerror(errno));
			return;
		}
		npools--;
		mib[2] = KERN_POOL_NAME;
		size = sizeof(name);
		if (sysctl(mib, 4, &name, &size, NULL, 0) == -1) {
			printf("error getting pool name: %s\n",
			    strerror(errno));
			return;
		}

		if (!strncmp(name, "mbufpl", strlen("mbufpl")))
			bcopy(&pool, &mbpool, sizeof(pool));
		else if (mclp < sizeof(mclpools) / sizeof(mclpools[0]) &&
		    !strncmp(name, *mclnamep, strlen(*mclnamep))) {
			bcopy(&pool, &mclpools[mclp++],
			    sizeof(pool));
			mclnamep++;
		}
	}

	totmbufs = 0;
	for (mp = mbtypes; mp->mt_name; mp++)
		totmbufs += (unsigned int)mbstat.m_mtypes[mp->mt_type];
	printf("%lu mbuf%s in use:\n", totmbufs, plural(totmbufs));
	for (mp = mbtypes; mp->mt_name; mp++)
		if (mbstat.m_mtypes[mp->mt_type]) {
			seen[mp->mt_type] = YES;
			printf("\t%lu mbuf%s allocated to %s\n",
			    mbstat.m_mtypes[mp->mt_type],
			    plural(mbstat.m_mtypes[mp->mt_type]),
			    mp->mt_name);
		}
	seen[MT_FREE] = YES;
	for (i = 0; i < nmbtypes; i++)
		if (!seen[i] && mbstat.m_mtypes[i]) {
			printf("\t%lu mbuf%s allocated to <mbuf type %d>\n",
			    mbstat.m_mtypes[i],
			    plural(mbstat.m_mtypes[i]), i);
		}
	totmem = (unsigned long)mbpool.pr_npages * mbpool.pr_pgsize;
	totpeak = (unsigned long)mbpool.pr_hiwat * mbpool.pr_pgsize;
	for (i = 0; i < mclp; i++) {
		printf("%u/%lu mbuf %d byte clusters in use"
		    " (current/peak)\n",
		    mclpools[i].pr_nout,
		    (unsigned long)
		    mclpools[i].pr_hiwat * mclpools[i].pr_itemsperpage,
		    mclpools[i].pr_size);
		totmem += (unsigned long)
		    mclpools[i].pr_npages * mclpools[i].pr_pgsize;
		totpeak += (unsigned long)
		    mclpools[i].pr_hiwat * mclpools[i].pr_pgsize;
	}

	printf("%lu/%lu/%lu Kbytes allocated to network "
	    "(current/peak/max)\n", totmem / 1024, totpeak / 1024,
	    ((unsigned long)maxclusters * MCLBYTES) / 1024);
	printf("%lu requests for memory denied\n", mbstat.m_drops);
	printf("%lu requests for memory delayed\n", mbstat.m_wait);
	printf("%lu calls to protocol drain routines\n", mbstat.m_drain);
}