/*      $OpenBSD: mroute.c,v 1.29 2025/06/06 20:37:06 jan 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/sysctl.h>

#include <netinet/in.h>
#include <netinet/igmp.h>
#include <netinet/ip_mroute.h>

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

void
mroutepr(void)
{
        u_int mrtproto;
        struct vifinfo *v;
        struct mfcinfo *m;
        size_t needed, numvifs, nummfcs, vifi, mfci;
        char *buf = NULL;
        char fmtbuf[FMT_SCALED_STRSIZE];
        vifi_t maxvif = 0;
        int mib[] = { CTL_NET, PF_INET, IPPROTO_IP, IPCTL_MRTPROTO };
        size_t len = sizeof(int);
        int banner_printed = 0, saved_nflag;

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

        saved_nflag = nflag;
        nflag = 1;

        mib[3] = IPCTL_MRTVIF;
        needed = get_sysctl(mib, sizeof(mib) / sizeof(mib[0]), &buf);
        numvifs = needed / sizeof(*v);
        v = (struct vifinfo *)buf;
        if (numvifs)
                maxvif = v[numvifs - 1].v_vifi;

        for (vifi = 0; vifi < numvifs; ++vifi, ++v) {
                if (!banner_printed) {
                        printf("\nVirtual Interface Table\n %s%s",
                            "Vif  Thresh  Local-Address    ",
                            "Remote-Address   Pkt_in  Pkt_out\n");
                        banner_printed = 1;
                }

                printf(" %3u     %3u  %-15.15s",
                    v->v_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");

        banner_printed = 0;

        mib[3] = IPCTL_MRTMFC;
        needed = get_sysctl(mib, sizeof(mib) / sizeof(mib[0]), &buf);
        nummfcs = needed / sizeof(*m);
        m = (struct mfcinfo *)buf;

        for (mfci = 0; mfci < nummfcs; ++mfci, ++m) {
                if (!banner_printed) {
                        printf("\nMulticast Forwarding Cache\n %s%s",
                            "Hash  Origin           Mcastgroup       ",
                            "Traffic  In-Vif  Out-Vifs/Forw-ttl\n");
                        banner_printed = 1;
                }

                printf("  %3zu  %-15.15s",
                    mfci, routename4(m->mfc_origin.s_addr));
                fmt_scaled(m->mfc_pkt_cnt, fmtbuf);
                printf("  %-15.15s  %7s     %3u ",
                    routename4(m->mfc_mcastgrp.s_addr),
                    fmtbuf, m->mfc_parent);
                for (vifi = 0; vifi <= maxvif; ++vifi)
                        if (m->mfc_ttls[vifi])
                                printf(" %zu/%u", vifi, m->mfc_ttls[vifi]);

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

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

        free(buf);
}

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

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

        printf("ip multicast forwarding:\n");
        printf("\t%lu multicast forwarding cache lookup%s\n",
            mrtstat.mrts_mfc_lookups, plural(mrtstat.mrts_mfc_lookups));
        printf("\t%lu multicast forwarding cache miss%s\n",
            mrtstat.mrts_mfc_misses, plurales(mrtstat.mrts_mfc_misses));
        printf("\t%lu upcall%s to mrouted\n",
            mrtstat.mrts_upcalls, plural(mrtstat.mrts_upcalls));
        printf("\t%lu datagram%s with no route for origin\n",
            mrtstat.mrts_no_route, plural(mrtstat.mrts_no_route));
        printf("\t%lu datagram%s with malformed tunnel options\n",
            mrtstat.mrts_bad_tunnel, plural(mrtstat.mrts_bad_tunnel));
        printf("\t%lu datagram%s could not be tunneled\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 queue overflow\n",
            mrtstat.mrts_upq_ovflw, plural(mrtstat.mrts_upq_ovflw));
        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 due to queue overflow\n",
            mrtstat.mrts_q_overflow, plural(mrtstat.mrts_q_overflow));
        printf("\t%lu datagram%s dropped for being too large\n",
            mrtstat.mrts_pkt2large, plural(mrtstat.mrts_pkt2large));
        printf("\t%lu datagram%s dropped due to full socket buffer\n",
            mrtstat.mrts_upq_sockfull, plural(mrtstat.mrts_upq_sockfull));
}