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Bring "netstat -m" output up to speed with the kernel

The kernel no longer sets watermarks on cluster pools rendering
"max" values useless. Instead, there's now a global limit on how
much memory all cluster pools combined together can allocate from
the system. The limit is set to kern.maxclusters number of 2Kb
increments which allows us to display current, peak and maximum
total memory used by the network.

OK claudio, millert

/*	$OpenBSD: mbuf.c,v 1.40 2017/10/28 15:25:20 mikeb 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(short);
bool seen[256];			/* "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 != 256) {
		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) < 0) {
		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) < 0) {
		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) < 0) {
		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) < 0) {
			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) < 0) {
			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%u 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%u mbuf%s allocated to <mbuf type %d>\n",
			    mbstat.m_mtypes[i],
			    plural(mbstat.m_mtypes[i]), i);
		}
	totmem = (mbpool.pr_npages * mbpool.pr_pgsize);
	totpeak = 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 += (mclpools[i].pr_npages * mclpools[i].pr_pgsize);
		totpeak += 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);
}