/*
 * 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.
 *
 * @(#)mbuf.c   8.1 (Berkeley) 6/6/93
 * $FreeBSD: src/usr.bin/netstat/mbuf.c,v 1.17.2.3 2001/08/10 09:07:09 ru Exp $
 */

#define _KERNEL_STRUCTURES
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/sysctl.h>

#include <err.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include "netstat.h"

#define YES     true

static struct mbtypenames {
        int     mt_type;
        const char *mt_name;
} mbtypenames[] = {
        { MT_DATA,      "data" },
        { MT_OOBDATA,   "oob data" },
        { MT_CONTROL,   "ancillary data" },
        { MT_HEADER,    "packet headers" },
        { MT_SONAME,    "socket names and addresses" },
        { 0, 0 }
};

/*
 * Print mbuf statistics.
 */
void
mbpr(u_long mbaddr, u_long mbtaddr, u_long nmbcaddr, u_long nmbjcaddr,
    u_long nmbufaddr, u_long ncpusaddr)
{
        u_long totmem, totpossible;
        struct mbstat *mbstat;
        struct mbtypenames *mp;
        int name[3], nmbclusters, nmbjclusters, nmbufs, nmbtypes;
        size_t nmbclen, nmbjclen, nmbuflen, mbstatlen, mbtypeslen;
        u_long *mbtypes;
        int ncpus;
        int n;
        int i;
        bool *seen;     /* "have we seen this type yet?" */

        mbtypes = NULL;
        seen = NULL;
        mbstat = NULL;

        /*
         * XXX
         * We can't kread() mbtypeslen from a core image so we'll
         * bogusly assume it's the same as in the running kernel.
         */
        if (sysctlbyname("kern.ipc.mbtypes", NULL, &mbtypeslen, NULL, 0) < 0) {
                warn("sysctl: retrieving mbtypes length");
                goto err;
        }
        nmbtypes = mbtypeslen / sizeof(*mbtypes);
        if ((seen = calloc(nmbtypes, sizeof(*seen))) == NULL) {
                warn("calloc");
                goto err;
        }

        if (mbaddr) {
                if (kread(ncpusaddr, (char *)&ncpus, sizeof ncpus))
                        goto err;
                mbstat = calloc(ncpus, sizeof(*mbstat));
                if (kread(mbaddr, (char *)mbstat, sizeof *mbstat * ncpus))
                        goto err;
                mbtypes = calloc(ncpus, mbtypeslen);
                if (kread(mbtaddr, (char *)mbtypes, mbtypeslen * ncpus))
                        goto err;
                if (kread(nmbcaddr, (char *)&nmbclusters, sizeof(int)))
                        goto err;
                if (kread(nmbjcaddr, (char *)&nmbjclusters, sizeof(int)))
                        goto err;
                if (kread(nmbufaddr, (char *)&nmbufs, sizeof(int)))
                        goto err;
                for (n = 1; n < ncpus; ++n) {
                        mbstat[0].m_mbufs += mbstat[n].m_mbufs;
                        mbstat[0].m_clusters += mbstat[n].m_clusters;
                        mbstat[0].m_drops += mbstat[n].m_drops;
                        mbstat[0].m_wait += mbstat[n].m_wait;
                        mbstat[0].m_drain += mbstat[n].m_drain;

                        for (i = 0; i < nmbtypes; ++i) {
                                mbtypes[i] += mbtypes[n * nmbtypes + i];
                        }
                }
        } else {
                name[0] = CTL_KERN;
                name[1] = KERN_IPC;
                name[2] = KIPC_MBSTAT;
                mbstat = malloc(sizeof(*mbstat));
                mbstatlen = sizeof *mbstat;
                /* fake ncpus, kernel will aggregate mbstat array for us */
                if (sysctl(name, 3, mbstat, &mbstatlen, 0, 0) < 0) {
                        warn("sysctl: retrieving mbstat");
                        goto err;
                }

                mbtypes = malloc(mbtypeslen);
                if (sysctlbyname("kern.ipc.mbtypes", mbtypes, &mbtypeslen, NULL,
                    0) < 0) {
                        warn("sysctl: retrieving mbtypes");
                        goto err;
                }
                
                name[2] = KIPC_NMBCLUSTERS;
                nmbclen = sizeof(int);
                if (sysctl(name, 3, &nmbclusters, &nmbclen, 0, 0) < 0) {
                        warn("sysctl: retrieving nmbclusters");
                        goto err;
                }

                nmbjclen = sizeof(int);
                if (sysctlbyname("kern.ipc.nmbjclusters",
                    &nmbjclusters, &nmbjclen, 0, 0) < 0) {
                        warn("sysctl: retrieving nmbjclusters");
                        goto err;
                }

                nmbuflen = sizeof(int);
                if (sysctlbyname("kern.ipc.nmbufs", &nmbufs, &nmbuflen, 0, 0) < 0) {
                        warn("sysctl: retrieving nmbufs");
                        goto err;
                }
        }

#undef MSIZE
#define MSIZE           (mbstat->m_msize)
#undef MCLBYTES
#define MCLBYTES        (mbstat->m_mclbytes)
#undef MJUMPAGESIZE
#define MJUMPAGESIZE    (mbstat->m_mjumpagesize)

        printf("%lu/%u mbufs in use (current/max):\n", mbstat->m_mbufs, nmbufs);
        printf("%lu/%u mbuf clusters in use (current/max)\n",
                mbstat->m_clusters, nmbclusters);
        printf("%lu/%u mbuf jumbo clusters in use (current/max)\n",
                mbstat->m_jclusters, nmbjclusters);
        for (mp = mbtypenames; mp->mt_name; mp++)
                if (mbtypes[mp->mt_type]) {
                        seen[mp->mt_type] = YES;
                        printf("\t%lu mbufs and mbuf clusters "
                               "allocated to %s\n",
                               mbtypes[mp->mt_type], mp->mt_name);
                }
        seen[MT_FREE] = YES;
        for (i = 0; i < nmbtypes; i++)
                if (!seen[i] && mbtypes[i]) {
                        printf("\t%lu mbufs and mbuf clusters allocated to <mbuf type %d>\n",
                            mbtypes[i], i);
                }
        totmem = mbstat->m_mbufs * MSIZE + mbstat->m_clusters * MCLBYTES +
            mbstat->m_jclusters * MJUMPAGESIZE;
        totpossible =  MSIZE * nmbufs + nmbclusters * MCLBYTES +
            nmbjclusters * MJUMPAGESIZE;
        printf("%lu Kbytes allocated to network (%lu%% of mb_map in use)\n",
                totmem / 1024, (totmem * 100) / totpossible);
        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);

err:
        if (mbstat != NULL)
                free(mbstat);
        if (mbtypes != NULL)
                free(mbtypes);
        if (seen != NULL)
                free(seen);
}