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ip6_mroute.c

//==========================================================================
//
//      src/sys/netinet6/ip6_mroute.c
//
//==========================================================================
//####BSDCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from OpenBSD, 
// FreeBSD or other sources, and are covered by the appropriate
// copyright disclaimers included herein.
//
// Portions created by Red Hat are
// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
//
// -------------------------------------------
//
//####BSDCOPYRIGHTEND####
//==========================================================================

/*    $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ */

/*
 * Copyright (C) 1998 WIDE Project.
 * 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 project 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 PROJECT 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 PROJECT 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.
 */

/*    BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp   */

/*
 * IP multicast forwarding procedures
 *
 * Written by David Waitzman, BBN Labs, August 1988.
 * Modified by Steve Deering, Stanford, February 1989.
 * Modified by Mark J. Steiglitz, Stanford, May, 1991
 * Modified by Van Jacobson, LBL, January 1993
 * Modified by Ajit Thyagarajan, PARC, August 1993
 * Modified by Bill Fenenr, PARC, April 1994
 *
 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
 */

/*
 * XXX it seems that home address option processing should be reverted
 * before calls to socket_send().  see sys/netinet6/dest6.c for details.
 */

#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/time.h>

#include <net/if.h>
#include <net/route.h>
#include <net/raw_cb.h>

#include <netinet/in.h>
#include <netinet/in_var.h>

#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip6_mroute.h>
#include <netinet6/pim6.h>
#include <netinet6/pim6_var.h>

#define M_HASCL(m) ((m)->m_flags & M_EXT)

static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *));
static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *));

static int set_pim6 __P((int *));
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
static int get_pim6 __P((struct mbuf *));
#endif
static int socket_send __P((struct socket *, struct mbuf *,
                      struct sockaddr_in6 *));
static int register_send __P((struct ip6_hdr *, struct mif6 *,
                        struct mbuf *));

/*
 * Globals.  All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static,
 * except for netstat or debugging purposes.
 */
struct socket  *ip6_mrouter = NULL;
int         ip6_mrouter_ver = 0;
int         ip6_mrtproto = IPPROTO_PIM;    /* for netstat only */
struct mrt6stat   mrt6stat;

#define NO_RTE_FOUND    0x1
#define RTE_FOUND 0x2

struct mf6c *mf6ctable[MF6CTBLSIZ];
u_char            n6expire[MF6CTBLSIZ];
#if (defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802)) 
struct mif6 mif6table[MAXMIFS];
#else
static struct mif6 mif6table[MAXMIFS];
#endif
#ifdef MRT6DEBUG
u_int       mrt6debug = 0;      /* debug level  */
#define           DEBUG_MFC   0x02
#define           DEBUG_FORWARD     0x04
#define           DEBUG_EXPIRE      0x08
#define           DEBUG_XMIT  0x10
#define         DEBUG_REG       0x20
#define         DEBUG_PIM       0x40
#endif

static void expire_upcalls __P((void *));
#define           EXPIRE_TIMEOUT    (hz / 4)    /* 4x / second */
#define           UPCALL_EXPIRE     6           /* number of timeouts */

#ifdef INET
#ifdef MROUTING
extern struct socket *ip_mrouter;
#endif
#endif

/*
 * 'Interfaces' associated with decapsulator (so we can tell
 * packets that went through it from ones that get reflected
 * by a broken gateway).  These interfaces are never linked into
 * the system ifnet list & no routes point to them.  I.e., packets
 * can't be sent this way.  They only exist as a placeholder for
 * multicast source verification.
 */
struct ifnet multicast_register_if;

#define ENCAP_HOPS 64

/*
 * Private variables.
 */
static mifi_t nummifs = 0;
static mifi_t reg_mif_num = (mifi_t)-1;

static struct pim6stat pim6stat;
static int pim6;

/*
 * Hash function for a source, group entry
 */
#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
                           (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
                           (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
                           (g).s6_addr32[2] ^ (g).s6_addr32[3])

/*
 * Find a route for a given origin IPv6 address and Multicast group address.
 * Quality of service parameter to be added in the future!!!
 */

#define MF6CFIND(o, g, rt) do { \
      struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
      rt = NULL; \
      mrt6stat.mrt6s_mfc_lookups++; \
      while (_rt) { \
            if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
                IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
                (_rt->mf6c_stall == NULL)) { \
                  rt = _rt; \
                  break; \
            } \
            _rt = _rt->mf6c_next; \
      } \
      if (rt == NULL) { \
            mrt6stat.mrt6s_mfc_misses++; \
      } \
} while (0)

/*
 * Macros to compute elapsed time efficiently
 * Borrowed from Van Jacobson's scheduling code
 */
#define TV_DELTA(a, b, delta) do { \
          int xxs; \
            \
          delta = (a).tv_usec - (b).tv_usec; \
          if ((xxs = (a).tv_sec - (b).tv_sec)) { \
             switch (xxs) { \
                  case 2: \
                    delta += 1000000; \
                        /* fall through */ \
                  case 1: \
                    delta += 1000000; \
                    break; \
                  default: \
                    delta += (1000000 * xxs); \
             } \
          } \
} while (0)

#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
            (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)

#ifdef UPCALL_TIMING
#define UPCALL_MAX      50
u_long upcall_data[UPCALL_MAX + 1];
static void collate();
#endif /* UPCALL_TIMING */

static int get_sg_cnt __P((struct sioc_sg_req6 *));
static int get_mif6_cnt __P((struct sioc_mif_req6 *));
static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int));
static int add_m6if __P((struct mif6ctl *));
static int del_m6if __P((mifi_t *));
static int add_m6fc __P((struct mf6cctl *));
static int del_m6fc __P((struct mf6cctl *));

#ifdef __NetBSD__
static struct callout expire_upcalls_ch = CALLOUT_INITIALIZER;
#elif (defined(__FreeBSD__) && __FreeBSD__ >= 3)
static struct callout expire_upcalls_ch;
#elif defined(__OpenBSD__)
static struct timeout expire_upcalls_ch;
#endif

/*
 * Handle MRT setsockopt commands to modify the multicast routing tables.
 */
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
int
ip6_mrouter_set(so, sopt)
      struct socket *so;
      struct sockopt *sopt;
{
      int   error = 0;
      struct mbuf *m;

      if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
            return (EACCES);

      if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
            return (error);
      if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
            return (error);

      switch (sopt->sopt_name) {
      case MRT6_INIT:
#ifdef MRT6_OINIT
      case MRT6_OINIT:
#endif
            error = ip6_mrouter_init(so, m, sopt->sopt_name);
            break;
      case MRT6_DONE:
            error = ip6_mrouter_done();
            break;
      case MRT6_ADD_MIF:
            error = add_m6if(mtod(m, struct mif6ctl *));
            break;
      case MRT6_DEL_MIF:
            error = del_m6if(mtod(m, mifi_t *));
            break;
      case MRT6_ADD_MFC:
            error = add_m6fc(mtod(m, struct mf6cctl *));
            break;
      case MRT6_DEL_MFC:
            error = del_m6fc(mtod(m, struct mf6cctl *));
            break;
      case MRT6_PIM:
            error = set_pim6(mtod(m, int *));
            break;
      default:
            error = EOPNOTSUPP;
            break;
      }

      (void)m_freem(m);
      return(error);
}
#else
int
ip6_mrouter_set(cmd, so, m)
      int cmd;
      struct socket *so;
      struct mbuf *m;
{
      if (cmd != MRT6_INIT && so != ip6_mrouter)
            return EACCES;

      switch (cmd) {
#ifdef MRT6_OINIT
      case MRT6_OINIT:  return ip6_mrouter_init(so, m, cmd);
#endif
      case MRT6_INIT:         return ip6_mrouter_init(so, m, cmd);
      case MRT6_DONE:         return ip6_mrouter_done();
      case MRT6_ADD_MIF:      return add_m6if(mtod(m, struct mif6ctl *));
      case MRT6_DEL_MIF:      return del_m6if(mtod(m, mifi_t *));
      case MRT6_ADD_MFC:      return add_m6fc(mtod(m, struct mf6cctl *));
      case MRT6_DEL_MFC:      return del_m6fc(mtod(m, struct mf6cctl *));
      case MRT6_PIM:          return set_pim6(mtod(m, int *));
      default:          return EOPNOTSUPP;
      }
}
#endif

/*
 * Handle MRT getsockopt commands
 */
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
int
ip6_mrouter_get(so, sopt)
      struct socket *so;
      struct sockopt *sopt;
{
      int error = 0;

      if (so != ip6_mrouter) return EACCES;

      switch (sopt->sopt_name) {
            case MRT6_PIM:
                  error = sooptcopyout(sopt, &pim6, sizeof(pim6));
                  break;
      }
      return (error);
}
#else
int
ip6_mrouter_get(cmd, so, m)
      int cmd;
      struct socket *so;
      struct mbuf **m;
{
      struct mbuf *mb;

      if (so != ip6_mrouter) return EACCES;

      *m = mb = m_get(M_WAIT, MT_SOOPTS);

      switch (cmd) {
      case MRT6_PIM:
            return get_pim6(mb);
      default:
            m_free(mb);
            return EOPNOTSUPP;
      }
}
#endif

/*
 * Handle ioctl commands to obtain information from the cache
 */
int
mrt6_ioctl(cmd, data)
      int cmd;
      caddr_t data;
{
      int error = 0;

      switch (cmd) {
      case SIOCGETSGCNT_IN6:
            return(get_sg_cnt((struct sioc_sg_req6 *)data));
            break;            /* for safety */
      case SIOCGETMIFCNT_IN6:
            return(get_mif6_cnt((struct sioc_mif_req6 *)data));
            break;            /* for safety */
      default:
            return (EINVAL);
            break;
      }
      return error;
}

/*
 * returns the packet, byte, rpf-failure count for the source group provided
 */
static int
get_sg_cnt(req)
      struct sioc_sg_req6 *req;
{
      struct mf6c *rt;
      int s;

#ifdef __NetBSD__
      s = splsoftnet();
#else
      s = splnet();
#endif
      MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
      splx(s);
      if (rt != NULL) {
            req->pktcnt = rt->mf6c_pkt_cnt;
            req->bytecnt = rt->mf6c_byte_cnt;
            req->wrong_if = rt->mf6c_wrong_if;
      } else
            return(ESRCH);
#if 0
            req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
#endif

      return 0;
}

/*
 * returns the input and output packet and byte counts on the mif provided
 */
static int
get_mif6_cnt(req)
      struct sioc_mif_req6 *req;
{
      mifi_t mifi = req->mifi;

      if (mifi >= nummifs)
            return EINVAL;

      req->icount = mif6table[mifi].m6_pkt_in;
      req->ocount = mif6table[mifi].m6_pkt_out;
      req->ibytes = mif6table[mifi].m6_bytes_in;
      req->obytes = mif6table[mifi].m6_bytes_out;

      return 0;
}

#if !(defined(__FreeBSD__) && __FreeBSD__ >=3)
/*
 * Get PIM processiong global
 */
static int
get_pim6(m)
      struct mbuf *m;
{
      int *i;

      i = mtod(m, int *);

      *i = pim6;

      return 0;
}
#endif

static int
set_pim6(i)
      int *i;
{
      if ((*i != 1) && (*i != 0))
            return EINVAL;

      pim6 = *i;

      return 0;
}

/*
 * Enable multicast routing
 */
static int
ip6_mrouter_init(so, m, cmd)
      struct socket *so;
      struct mbuf *m;
      int cmd;
{
      int *v;

#ifdef MRT6DEBUG
      if (mrt6debug)
            log(LOG_DEBUG,
                "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
                so->so_type, so->so_proto->pr_protocol);
#endif

      if (so->so_type != SOCK_RAW ||
          so->so_proto->pr_protocol != IPPROTO_ICMPV6)
            return EOPNOTSUPP;

      if (!m || (m->m_len != sizeof(int *)))
            return ENOPROTOOPT;

      v = mtod(m, int *);
      if (*v != 1)
            return ENOPROTOOPT;

      if (ip6_mrouter != NULL) return EADDRINUSE;

      ip6_mrouter = so;
      ip6_mrouter_ver = cmd;

      bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
      bzero((caddr_t)n6expire, sizeof(n6expire));

      pim6 = 0;/* used for stubbing out/in pim stuff */

#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
      callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
          expire_upcalls, NULL);
#elif defined(__OpenBSD__)
      timeout_set(&expire_upcalls_ch, expire_upcalls, NULL);
      timeout_add(&expire_upcalls_ch, EXPIRE_TIMEOUT);
#else
      timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);
#endif

#ifdef MRT6DEBUG
      if (mrt6debug)
            log(LOG_DEBUG, "ip6_mrouter_init\n");
#endif

      return 0;
}

/*
 * Disable multicast routing
 */
int
ip6_mrouter_done()
{
      mifi_t mifi;
      int i;
      struct ifnet *ifp;
      struct in6_ifreq ifr;
      struct mf6c *rt;
      struct rtdetq *rte;
      int s;

#ifdef __NetBSD__
      s = splsoftnet();
#else
      s = splnet();
#endif

      /*
       * For each phyint in use, disable promiscuous reception of all IPv6
       * multicasts.
       */
#ifdef INET
#ifdef MROUTING
      /*
       * If there is still IPv4 multicast routing daemon,
       * we remain interfaces to receive all muliticasted packets.
       * XXX: there may be an interface in which the IPv4 multicast
       * daemon is not interested...
       */
      if (!ip_mrouter)
#endif
#endif
      {
            for (mifi = 0; mifi < nummifs; mifi++) {
                  if (mif6table[mifi].m6_ifp &&
                      !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
                        ifr.ifr_addr.sin6_family = AF_INET6;
                        ifr.ifr_addr.sin6_addr= in6addr_any;
                        ifp = mif6table[mifi].m6_ifp;
                        (*ifp->if_ioctl)(ifp, SIOCDELMULTI,
                                     (caddr_t)&ifr);
                  }
            }
      }
#ifdef notyet
      bzero((caddr_t)qtable, sizeof(qtable));
      bzero((caddr_t)tbftable, sizeof(tbftable));
#endif
      bzero((caddr_t)mif6table, sizeof(mif6table));
      nummifs = 0;

      pim6 = 0; /* used to stub out/in pim specific code */

#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
      callout_stop(&expire_upcalls_ch);
#elif defined(__OpenBSD__)
      timeout_del(&expire_upcalls_ch);
#else
      untimeout(expire_upcalls, (caddr_t)NULL);
#endif

      /*
       * Free all multicast forwarding cache entries.
       */
      for (i = 0; i < MF6CTBLSIZ; i++) {
            rt = mf6ctable[i];
            while (rt) {
                  struct mf6c *frt;

                  for (rte = rt->mf6c_stall; rte != NULL; ) {
                        struct rtdetq *n = rte->next;

                        m_free(rte->m);
                        free(rte, M_MRTABLE);
                        rte = n;
                  }
                  frt = rt;
                  rt = rt->mf6c_next;
                  free(frt, M_MRTABLE);
            }
      }

      bzero((caddr_t)mf6ctable, sizeof(mf6ctable));

      /*
       * Reset de-encapsulation cache
       */
      reg_mif_num = -1;

      ip6_mrouter = NULL;
      ip6_mrouter_ver = 0;

      splx(s);

#ifdef MRT6DEBUG
      if (mrt6debug)
            log(LOG_DEBUG, "ip6_mrouter_done\n");
#endif

      return 0;
}

static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };

/*
 * Add a mif to the mif table
 */
static int
add_m6if(mifcp)
      struct mif6ctl *mifcp;
{
      struct mif6 *mifp;
      struct ifnet *ifp;
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
      struct in6_ifreq ifr;
#endif
      int error, s;
#ifdef notyet
      struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi;
#endif

      if (mifcp->mif6c_mifi >= MAXMIFS)
            return EINVAL;
      mifp = mif6table + mifcp->mif6c_mifi;
      if (mifp->m6_ifp)
            return EADDRINUSE; /* XXX: is it appropriate? */
      if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
            return ENXIO;
      /*
       * XXX: some OSes can remove ifp and clear ifindex2ifnet[id]
       * even for id between 0 and if_index.
       */
#if defined(__FreeBSD__) && __FreeBSD__ >= 5
      ifp = ifnet_byindex(mifcp->mif6c_pifi);
#else
      ifp = ifindex2ifnet[mifcp->mif6c_pifi];
#endif
      if (ifp == NULL)
            return ENXIO;

      if (mifcp->mif6c_flags & MIFF_REGISTER) {
            if (reg_mif_num == (mifi_t)-1) {
#if defined(__NetBSD__) || defined(__OpenBSD__)
                  strcpy(multicast_register_if.if_xname,
                         "register_mif"); /* XXX */
#else
                  multicast_register_if.if_name = "register_mif";
#endif
                  multicast_register_if.if_flags |= IFF_LOOPBACK;
                  multicast_register_if.if_index = mifcp->mif6c_mifi;
                  reg_mif_num = mifcp->mif6c_mifi;
            }

            ifp = &multicast_register_if;

      } /* if REGISTER */
      else {
            /* Make sure the interface supports multicast */
            if ((ifp->if_flags & IFF_MULTICAST) == 0)
                  return EOPNOTSUPP;

#ifdef __NetBSD__
            s = splsoftnet();
#else
            s = splnet();
#endif
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3)
            error = if_allmulti(ifp, 1);
#else
            /*
             * Enable promiscuous reception of all IPv6 multicasts
             * from the interface.
             */
            ifr.ifr_addr.sin6_family = AF_INET6;
            ifr.ifr_addr.sin6_addr = in6addr_any;
            error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr);
#endif
            splx(s);
            if (error)
                  return error;
      }

#ifdef __NetBSD__
      s = splsoftnet();
#else
      s = splnet();
#endif
      mifp->m6_flags     = mifcp->mif6c_flags;
      mifp->m6_ifp       = ifp;
#ifdef notyet
      /* scaling up here allows division by 1024 in critical code */
      mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000;
#endif
      /* initialize per mif pkt counters */
      mifp->m6_pkt_in    = 0;
      mifp->m6_pkt_out   = 0;
      mifp->m6_bytes_in  = 0;
      mifp->m6_bytes_out = 0;
      splx(s);

      /* Adjust nummifs up if the mifi is higher than nummifs */
      if (nummifs <= mifcp->mif6c_mifi)
            nummifs = mifcp->mif6c_mifi + 1;

#ifdef MRT6DEBUG
      if (mrt6debug)
            log(LOG_DEBUG,
                "add_mif #%d, phyint %s%d\n",
                mifcp->mif6c_mifi,
                ifp->if_name, ifp->if_unit);
#endif

      return 0;
}

/*
 * Delete a mif from the mif table
 */
static int
del_m6if(mifip)
      mifi_t *mifip;
{
      struct mif6 *mifp = mif6table + *mifip;
      mifi_t mifi;
      struct ifnet *ifp;
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
      struct in6_ifreq ifr;
#endif
      int s;

      if (*mifip >= nummifs)
            return EINVAL;
      if (mifp->m6_ifp == NULL)
            return EINVAL;

#ifdef __NetBSD__
      s = splsoftnet();
#else
      s = splnet();
#endif

      if (!(mifp->m6_flags & MIFF_REGISTER)) {
            /*
             * XXX: what if there is yet IPv4 multicast daemon
             *      using the interface?
             */
            ifp = mifp->m6_ifp;

#if (defined(__FreeBSD__) && __FreeBSD__ >= 3)
            if_allmulti(ifp, 0);
#else
            ifr.ifr_addr.sin6_family = AF_INET6;
            ifr.ifr_addr.sin6_addr = in6addr_any;
            (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr);
#endif
      }

#ifdef notyet
      bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip]));
      bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf)));
#endif
      bzero((caddr_t)mifp, sizeof (*mifp));

      /* Adjust nummifs down */
      for (mifi = nummifs; mifi > 0; mifi--)
            if (mif6table[mifi - 1].m6_ifp)
                  break;
      nummifs = mifi;

      splx(s);

#ifdef MRT6DEBUG
      if (mrt6debug)
            log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
#endif

      return 0;
}

/*
 * Add an mfc entry
 */
static int
add_m6fc(mfccp)
      struct mf6cctl *mfccp;
{
      struct mf6c *rt;
      u_long hash;
      struct rtdetq *rte;
      u_short nstl;
      int s;

      MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
             mfccp->mf6cc_mcastgrp.sin6_addr, rt);

      /* If an entry already exists, just update the fields */
      if (rt) {
#ifdef MRT6DEBUG
            if (mrt6debug & DEBUG_MFC)
                  log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n",
                      ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
                      ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
                      mfccp->mf6cc_parent);
#endif

#ifdef __NetBSD__
            s = splsoftnet();
#else
            s = splnet();
#endif
            rt->mf6c_parent = mfccp->mf6cc_parent;
            rt->mf6c_ifset = mfccp->mf6cc_ifset;
            splx(s);
            return 0;
      }

      /*
       * Find the entry for which the upcall was made and update
       */
#ifdef __NetBSD__
      s = splsoftnet();
#else
      s = splnet();
#endif
      hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
                  mfccp->mf6cc_mcastgrp.sin6_addr);
      for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
            if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
                               &mfccp->mf6cc_origin.sin6_addr) &&
                IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
                               &mfccp->mf6cc_mcastgrp.sin6_addr) &&
                (rt->mf6c_stall != NULL)) {

                  if (nstl++)
                        log(LOG_ERR,
                            "add_m6fc: %s o %s g %s p %x dbx %p\n",
                            "multiple kernel entries",
                            ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
                            ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
                            mfccp->mf6cc_parent, rt->mf6c_stall);

#ifdef MRT6DEBUG
                  if (mrt6debug & DEBUG_MFC)
                        log(LOG_DEBUG,
                            "add_m6fc o %s g %s p %x dbg %x\n",
                            ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
                            ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
                            mfccp->mf6cc_parent, rt->mf6c_stall);
#endif

                  rt->mf6c_origin     = mfccp->mf6cc_origin;
                  rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
                  rt->mf6c_parent     = mfccp->mf6cc_parent;
                  rt->mf6c_ifset        = mfccp->mf6cc_ifset;
                  /* initialize pkt counters per src-grp */
                  rt->mf6c_pkt_cnt    = 0;
                  rt->mf6c_byte_cnt   = 0;
                  rt->mf6c_wrong_if   = 0;

                  rt->mf6c_expire = 0;    /* Don't clean this guy up */
                  n6expire[hash]--;

                  /* free packets Qed at the end of this entry */
                  for (rte = rt->mf6c_stall; rte != NULL; ) {
                        struct rtdetq *n = rte->next;
                        ip6_mdq(rte->m, rte->ifp, rt);
                        m_freem(rte->m);
#ifdef UPCALL_TIMING
                        collate(&(rte->t));
#endif /* UPCALL_TIMING */
                        free(rte, M_MRTABLE);
                        rte = n;
                  }
                  rt->mf6c_stall = NULL;
            }
      }

      /*
       * It is possible that an entry is being inserted without an upcall
       */
      if (nstl == 0) {
#ifdef MRT6DEBUG
            if (mrt6debug & DEBUG_MFC)
                  log(LOG_DEBUG,
                      "add_m6fc no upcall h %d o %s g %s p %x\n",
                      hash,
                      ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
                      ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
                      mfccp->mf6cc_parent);
#endif

            for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
      
                  if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
                                     &mfccp->mf6cc_origin.sin6_addr)&&
                      IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
                                     &mfccp->mf6cc_mcastgrp.sin6_addr)) {

                        rt->mf6c_origin     = mfccp->mf6cc_origin;
                        rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
                        rt->mf6c_parent     = mfccp->mf6cc_parent;
                        rt->mf6c_ifset        = mfccp->mf6cc_ifset;
                        /* initialize pkt counters per src-grp */
                        rt->mf6c_pkt_cnt    = 0;
                        rt->mf6c_byte_cnt   = 0;
                        rt->mf6c_wrong_if   = 0;

                        if (rt->mf6c_expire)
                              n6expire[hash]--;
                        rt->mf6c_expire      = 0;
                  }
            }
            if (rt == NULL) {
                  /* no upcall, so make a new entry */
                  rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE,
                                      M_NOWAIT);
                  if (rt == NULL) {
                        splx(s);
                        return ENOBUFS;
                  }
      
                  /* insert new entry at head of hash chain */
                  rt->mf6c_origin     = mfccp->mf6cc_origin;
                  rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
                  rt->mf6c_parent     = mfccp->mf6cc_parent;
                  rt->mf6c_ifset        = mfccp->mf6cc_ifset;
                  /* initialize pkt counters per src-grp */
                  rt->mf6c_pkt_cnt    = 0;
                  rt->mf6c_byte_cnt   = 0;
                  rt->mf6c_wrong_if   = 0;
                  rt->mf6c_expire     = 0;
                  rt->mf6c_stall = NULL;
      
                  /* link into table */
                  rt->mf6c_next  = mf6ctable[hash];
                  mf6ctable[hash] = rt;
            }
      }
      splx(s);
      return 0;
}

#ifdef UPCALL_TIMING
/*
 * collect delay statistics on the upcalls
 */
static void
collate(t)
      struct timeval *t;
{
      u_long d;
      struct timeval tp;
      u_long delta;

      GET_TIME(tp);

      if (TV_LT(*t, tp))
      {
            TV_DELTA(tp, *t, delta);
      
            d = delta >> 10;
            if (d > UPCALL_MAX)
                  d = UPCALL_MAX;
      
            ++upcall_data[d];
      }
}
#endif /* UPCALL_TIMING */

/*
 * Delete an mfc entry
 */
static int
del_m6fc(mfccp)
      struct mf6cctl *mfccp;
{
      struct sockaddr_in6     origin;
      struct sockaddr_in6     mcastgrp;
      struct mf6c             *rt;
      struct mf6c       **nptr;
      u_long            hash;
      int s;

      origin = mfccp->mf6cc_origin;
      mcastgrp = mfccp->mf6cc_mcastgrp;
      hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);

#ifdef MRT6DEBUG
      if (mrt6debug & DEBUG_MFC)
            log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
                ip6_sprintf(&origin.sin6_addr),
                ip6_sprintf(&mcastgrp.sin6_addr));
#endif

#ifdef __NetBSD__
      s = splsoftnet();
#else
      s = splnet();
#endif

      nptr = &mf6ctable[hash];
      while ((rt = *nptr) != NULL) {
            if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
                               &rt->mf6c_origin.sin6_addr) &&
                IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
                               &rt->mf6c_mcastgrp.sin6_addr) &&
                rt->mf6c_stall == NULL)
                  break;

            nptr = &rt->mf6c_next;
      }
      if (rt == NULL) {
            splx(s);
            return EADDRNOTAVAIL;
      }

      *nptr = rt->mf6c_next;
      free(rt, M_MRTABLE);

      splx(s);

      return 0;
}

static int
socket_send(s, mm, src)
      struct socket *s;
      struct mbuf *mm;
      struct sockaddr_in6 *src;
{
      if (s) {
            if (sbappendaddr(&s->so_rcv,
                         (struct sockaddr *)src,
                         mm, (struct mbuf *)0) != 0) {
                  sorwakeup(s);
                  return 0;
            }
      }
      m_freem(mm);
      return -1;
}

/*
 * IPv6 multicast forwarding function. This function assumes that the packet
 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
 * pointed to by "ifp", and the packet is to be relayed to other networks
 * that have members of the packet's destination IPv6 multicast group.
 *
 * The packet is returned unscathed to the caller, unless it is
 * erroneous, in which case a non-zero return value tells the caller to
 * discard it.
 */

int
ip6_mforward(ip6, ifp, m)
      struct ip6_hdr *ip6;
      struct ifnet *ifp;
      struct mbuf *m;
{
      struct mf6c *rt;
      struct mif6 *mifp;
      struct mbuf *mm;
      int s;
      mifi_t mifi;
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
      long time_second = time.tv_sec;
#endif

#ifdef MRT6DEBUG
      if (mrt6debug & DEBUG_FORWARD)
            log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
                ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst),
                ifp->if_index);
#endif

      /*
       * Don't forward a packet with Hop limit of zero or one,
       * or a packet destined to a local-only group.
       */
      if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
          IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
            return 0;
      ip6->ip6_hlim--;

      /*
       * Source address check: do not forward packets with unspecified
       * source. It was discussed in July 2000, on ipngwg mailing list.
       * This is rather more serious than unicast cases, because some
       * MLD packets can be sent with the unspecified source address
       * (although such packets must normally set 1 to the hop limit field).
       */
      if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
            ip6stat.ip6s_cantforward++;
            if (ip6_log_time + ip6_log_interval < time_second) {
                  ip6_log_time = time_second;
                  log(LOG_DEBUG,
                      "cannot forward "
                      "from %s to %s nxt %d received on %s\n",
                      ip6_sprintf(&ip6->ip6_src),
                      ip6_sprintf(&ip6->ip6_dst),
                      ip6->ip6_nxt,
                      m->m_pkthdr.rcvif ?
                      if_name(m->m_pkthdr.rcvif) : "?");
            }
            return 0;
      }

      /*
       * Determine forwarding mifs from the forwarding cache table
       */
#ifdef __NetBSD__
      s = splsoftnet();
#else
      s = splnet();
#endif
      MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);

      /* Entry exists, so forward if necessary */
      if (rt) {
            splx(s);
            return (ip6_mdq(m, ifp, rt));
      } else {
            /*
             * If we don't have a route for packet's origin,
             * Make a copy of the packet &
             * send message to routing daemon
             */

            struct mbuf *mb0;
            struct rtdetq *rte;
            u_long hash;
/*          int i, npkts;*/
#ifdef UPCALL_TIMING
            struct timeval tp;

            GET_TIME(tp);
#endif /* UPCALL_TIMING */

            mrt6stat.mrt6s_no_route++;
#ifdef MRT6DEBUG
            if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
                  log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
                      ip6_sprintf(&ip6->ip6_src),
                      ip6_sprintf(&ip6->ip6_dst));
#endif

            /*
             * Allocate mbufs early so that we don't do extra work if we
             * are just going to fail anyway.
             */
            rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE,
                                    M_NOWAIT);
            if (rte == NULL) {
                  splx(s);
                  return ENOBUFS;
            }
            mb0 = m_copy(m, 0, M_COPYALL);
            /*
             * Pullup packet header if needed before storing it,
             * as other references may modify it in the meantime.
             */
            if (mb0 &&
                (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
                  mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
            if (mb0 == NULL) {
                  free(rte, M_MRTABLE);
                  splx(s);
                  return ENOBUFS;
            }
      
            /* is there an upcall waiting for this packet? */
            hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
            for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
                  if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
                                     &rt->mf6c_origin.sin6_addr) &&
                      IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
                                     &rt->mf6c_mcastgrp.sin6_addr) &&
                      (rt->mf6c_stall != NULL))
                        break;
            }

            if (rt == NULL) {
                  struct mrt6msg *im;
#ifdef MRT6_OINIT
                  struct omrt6msg *oim;
#endif

                  /* no upcall, so make a new entry */
                  rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE,
                                      M_NOWAIT);
                  if (rt == NULL) {
                        free(rte, M_MRTABLE);
                        m_freem(mb0);
                        splx(s);
                        return ENOBUFS;
                  }
                  /*
                   * Make a copy of the header to send to the user
                   * level process
                   */
                  mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));

                  if (mm == NULL) {
                        free(rte, M_MRTABLE);
                        m_freem(mb0);
                        free(rt, M_MRTABLE);
                        splx(s);
                        return ENOBUFS;
                  }

                  /*
                   * Send message to routing daemon
                   */
                  sin6.sin6_addr = ip6->ip6_src;
      
                  im = NULL;
#ifdef MRT6_OINIT
                  oim = NULL;
#endif
                  switch (ip6_mrouter_ver) {
#ifdef MRT6_OINIT
                  case MRT6_OINIT:
                        oim = mtod(mm, struct omrt6msg *);
                        oim->im6_msgtype = MRT6MSG_NOCACHE;
                        oim->im6_mbz = 0;
                        break;
#endif
                  case MRT6_INIT:
                        im = mtod(mm, struct mrt6msg *);
                        im->im6_msgtype = MRT6MSG_NOCACHE;
                        im->im6_mbz = 0;
                        break;
                  default:
                        free(rte, M_MRTABLE);
                        m_freem(mb0);
                        free(rt, M_MRTABLE);
                        splx(s);
                        return EINVAL;
                  }

#ifdef MRT6DEBUG
                  if (mrt6debug & DEBUG_FORWARD)
                        log(LOG_DEBUG,
                            "getting the iif info in the kernel\n");
#endif

                  for (mifp = mif6table, mifi = 0;
                       mifi < nummifs && mifp->m6_ifp != ifp;
                       mifp++, mifi++)
                        ;

                  switch (ip6_mrouter_ver) {
#ifdef MRT6_OINIT
                  case MRT6_OINIT:
                        oim->im6_mif = mifi;
                        break;
#endif
                  case MRT6_INIT:
                        im->im6_mif = mifi;
                        break;
                  }

                  if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
                        log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
                            "socket queue full\n");
                        mrt6stat.mrt6s_upq_sockfull++;
                        free(rte, M_MRTABLE);
                        m_freem(mb0);
                        free(rt, M_MRTABLE);
                        splx(s);
                        return ENOBUFS;
                  }

                  mrt6stat.mrt6s_upcalls++;

                  /* insert new entry at head of hash chain */
                  bzero(rt, sizeof(*rt));
                  rt->mf6c_origin.sin6_family = AF_INET6;
                  rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
                  rt->mf6c_origin.sin6_addr = ip6->ip6_src;
                  rt->mf6c_mcastgrp.sin6_family = AF_INET6;
                  rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
                  rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
                  rt->mf6c_expire = UPCALL_EXPIRE;
                  n6expire[hash]++;
                  rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;

                  /* link into table */
                  rt->mf6c_next  = mf6ctable[hash];
                  mf6ctable[hash] = rt;
                  /* Add this entry to the end of the queue */
                  rt->mf6c_stall = rte;
            } else {
                  /* determine if q has overflowed */
                  struct rtdetq **p;
                  int npkts = 0;

                  for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
                        if (++npkts > MAX_UPQ6) {
                              mrt6stat.mrt6s_upq_ovflw++;
                              free(rte, M_MRTABLE);
                              m_freem(mb0);
                              splx(s);
                              return 0;
                        }

                  /* Add this entry to the end of the queue */
                  *p = rte;
            }

            rte->next = NULL;
            rte->m = mb0;
            rte->ifp = ifp;
#ifdef UPCALL_TIMING
            rte->t = tp;
#endif /* UPCALL_TIMING */

            splx(s);

            return 0;
      }
}

/*
 * Clean up cache entries if upcalls are not serviced
 * Call from the Slow Timeout mechanism, every half second.
 */
static void
expire_upcalls(unused)
      void *unused;
{
      struct rtdetq *rte;
      struct mf6c *mfc, **nptr;
      int i;
      int s;

#ifdef __NetBSD__
      s = splsoftnet();
#else
      s = splnet();
#endif
      for (i = 0; i < MF6CTBLSIZ; i++) {
            if (n6expire[i] == 0)
                  continue;
            nptr = &mf6ctable[i];
            while ((mfc = *nptr) != NULL) {
                  rte = mfc->mf6c_stall;
                  /*
                   * Skip real cache entries
                   * Make sure it wasn't marked to not expire (shouldn't happen)
                   * If it expires now
                   */
                  if (rte != NULL &&
                      mfc->mf6c_expire != 0 &&
                      --mfc->mf6c_expire == 0) {
#ifdef MRT6DEBUG
                        if (mrt6debug & DEBUG_EXPIRE)
                              log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
                                  ip6_sprintf(&mfc->mf6c_origin.sin6_addr),
                                  ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr));
#endif
                        /*
                         * drop all the packets
                         * free the mbuf with the pkt, if, timing info
                         */
                        do {
                              struct rtdetq *n = rte->next;
                              m_freem(rte->m);
                              free(rte, M_MRTABLE);
                              rte = n;
                        } while (rte != NULL);
                        mrt6stat.mrt6s_cache_cleanups++;
                        n6expire[i]--;

                        *nptr = mfc->mf6c_next;
                        free(mfc, M_MRTABLE);
                  } else {
                        nptr = &mfc->mf6c_next;
                  }
            }
      }
      splx(s);
#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
      callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
          expire_upcalls, NULL);
#elif defined(__OpenBSD__)
      timeout_set(&expire_upcalls_ch, expire_upcalls, NULL);
      timeout_add(&expire_upcalls_ch, EXPIRE_TIMEOUT);
#else
      timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);
#endif
}

/*
 * Packet forwarding routine once entry in the cache is made
 */
static int
ip6_mdq(m, ifp, rt)
      struct mbuf *m;
      struct ifnet *ifp;
      struct mf6c *rt;
{
      struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
      mifi_t mifi, iif;
      struct mif6 *mifp;
      int plen = m->m_pkthdr.len;

/*
 * Macro to send packet on mif.  Since RSVP packets don't get counted on
 * input, they shouldn't get counted on output, so statistics keeping is
 * seperate.
 */

#define MC6_SEND(ip6, mifp, m) do {                   \
            if ((mifp)->m6_flags & MIFF_REGISTER)           \
                register_send((ip6), (mifp), (m));          \
            else                                \
                phyint_send((ip6), (mifp), (m));            \
} while (0)

      /*
       * Don't forward if it didn't arrive from the parent mif
       * for its origin.
       */
      mifi = rt->mf6c_parent;
      if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
            /* came in the wrong interface */
#ifdef MRT6DEBUG
            if (mrt6debug & DEBUG_FORWARD)
                  log(LOG_DEBUG,
                      "wrong if: ifid %d mifi %d mififid %x\n",
                      ifp->if_index, mifi,
                      mif6table[mifi].m6_ifp->if_index);
#endif
            mrt6stat.mrt6s_wrong_if++;
            rt->mf6c_wrong_if++;
            /*
             * If we are doing PIM processing, and we are forwarding
             * packets on this interface, send a message to the
             * routing daemon.
             */
            /* have to make sure this is a valid mif */
            if (mifi < nummifs && mif6table[mifi].m6_ifp)
                  if (pim6 && (m->m_flags & M_LOOP) == 0) {
                        /*
                         * Check the M_LOOP flag to avoid an
                         * unnecessary PIM assert.
                         * XXX: M_LOOP is an ad-hoc hack...
                         */
                        static struct sockaddr_in6 sin6 =
                        { sizeof(sin6), AF_INET6 };

                        struct mbuf *mm;
                        struct mrt6msg *im;
#ifdef MRT6_OINIT
                        struct omrt6msg *oim;
#endif

                        mm = m_copy(m, 0, sizeof(struct ip6_hdr));
                        if (mm &&
                            (M_HASCL(mm) ||
                             mm->m_len < sizeof(struct ip6_hdr)))
                              mm = m_pullup(mm, sizeof(struct ip6_hdr));
                        if (mm == NULL)
                              return ENOBUFS;
      
#ifdef MRT6_OINIT
                        oim = NULL;
#endif
                        im = NULL;
                        switch (ip6_mrouter_ver) {
#ifdef MRT6_OINIT
                        case MRT6_OINIT:
                              oim = mtod(mm, struct omrt6msg *);
                              oim->im6_msgtype = MRT6MSG_WRONGMIF;
                              oim->im6_mbz = 0;
                              break;
#endif
                        case MRT6_INIT:
                              im = mtod(mm, struct mrt6msg *);
                              im->im6_msgtype = MRT6MSG_WRONGMIF;
                              im->im6_mbz = 0;
                              break;
                        default:
                              m_freem(mm);
                              return EINVAL;
                        }

                        for (mifp = mif6table, iif = 0;
                             iif < nummifs && mifp &&
                                   mifp->m6_ifp != ifp;
                             mifp++, iif++)
                              ;

                        switch (ip6_mrouter_ver) {
#ifdef MRT6_OINIT
                        case MRT6_OINIT:
                              oim->im6_mif = iif;
                              sin6.sin6_addr = oim->im6_src;
                              break;
#endif
                        case MRT6_INIT:
                              im->im6_mif = iif;
                              sin6.sin6_addr = im->im6_src;
                              break;
                        }

                        mrt6stat.mrt6s_upcalls++;

                        if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
#ifdef MRT6DEBUG
                              if (mrt6debug)
                                    log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
#endif
                              ++mrt6stat.mrt6s_upq_sockfull;
                              return ENOBUFS;
                        }     /* if socket Q full */
                  }           /* if PIM */
            return 0;
      }                 /* if wrong iif */

      /* If I sourced this packet, it counts as output, else it was input. */
      if (m->m_pkthdr.rcvif == NULL) {
            /* XXX: is rcvif really NULL when output?? */
            mif6table[mifi].m6_pkt_out++;
            mif6table[mifi].m6_bytes_out += plen;
      } else {
            mif6table[mifi].m6_pkt_in++;
            mif6table[mifi].m6_bytes_in += plen;
      }
      rt->mf6c_pkt_cnt++;
      rt->mf6c_byte_cnt += plen;

      /*
       * For each mif, forward a copy of the packet if there are group
       * members downstream on the interface.
       */
      for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++)
            if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
                  int64_t dscopein, sscopein, dscopeout, sscopeout;

                  /*
                   * check if the outgoing packet is going to break
                   * a scope boundary.
                   * XXX For packets through PIM register tunnel
                   * interface, we believe a routing daemon.
                   */
                  if ((mif6table[rt->mf6c_parent].m6_flags &
                       MIFF_REGISTER) == 0 &&
                      (mif6table[mifi].m6_flags & MIFF_REGISTER) == 0) {
                        if ((dscopein = in6_addr2zoneid(ifp, &ip6->ip6_dst)) < 0 ||
                            (dscopeout = in6_addr2zoneid(mif6table[mifi].m6_ifp, &ip6->ip6_dst)) < 0 ||
                            (sscopein = in6_addr2zoneid(ifp, &ip6->ip6_src)) < 0 ||
                            (sscopeout = in6_addr2zoneid(mif6table[mifi].m6_ifp, &ip6->ip6_src)) < 0 ||
                            dscopein != dscopeout ||
                            sscopein != sscopeout) {
                              ip6stat.ip6s_badscope++;
                              continue;
                        }
                  }

                  mifp->m6_pkt_out++;
                  mifp->m6_bytes_out += plen;
                  MC6_SEND(ip6, mifp, m);
            }
      return 0;
}

static void
phyint_send(ip6, mifp, m)
    struct ip6_hdr *ip6;
    struct mif6 *mifp;
    struct mbuf *m;
{
      struct mbuf *mb_copy;
      struct ifnet *ifp = mifp->m6_ifp;
      int error = 0;
#ifdef __NetBSD__
      int s = splsoftnet();   /* needs to protect static "ro" below. */
#else
      int s = splnet(); /* needs to protect static "ro" below. */
#endif
#ifdef NEW_STRUCT_ROUTE
      static struct route ro;
#else
      static struct route_in6 ro;
#endif
      struct      in6_multi *in6m;
      struct sockaddr_in6 *dst6;

      /*
       * Make a new reference to the packet; make sure that
       * the IPv6 header is actually copied, not just referenced,
       * so that ip6_output() only scribbles on the copy.
       */
      mb_copy = m_copy(m, 0, M_COPYALL);
      if (mb_copy &&
          (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
            mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
      if (mb_copy == NULL) {
            splx(s);
            return;
      }
      /* set MCAST flag to the outgoing packet */
      mb_copy->m_flags |= M_MCAST;

      /*
       * If we sourced the packet, call ip6_output since we may devide
       * the packet into fragments when the packet is too big for the
       * outgoing interface.
       * Otherwise, we can simply send the packet to the interface
       * sending queue.
       */
      if (m->m_pkthdr.rcvif == NULL) {
            struct ip6_moptions im6o;

            im6o.im6o_multicast_ifp = ifp;
            /* XXX: ip6_output will override ip6->ip6_hlim */
            im6o.im6o_multicast_hlim = ip6->ip6_hlim;
            im6o.im6o_multicast_loop = 1;
            error = ip6_output(mb_copy, NULL, &ro,
                           IPV6_FORWARDING, &im6o, NULL);

#ifdef MRT6DEBUG
            if (mrt6debug & DEBUG_XMIT)
                  log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
                      mifp - mif6table, error);
#endif
            splx(s);
            return;
      }

      /*
       * If we belong to the destination multicast group
       * on the outgoing interface, loop back a copy.
       */
      dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
      IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
      if (in6m != NULL) {
            dst6->sin6_len = sizeof(struct sockaddr_in6);
            dst6->sin6_family = AF_INET6;
            dst6->sin6_addr = ip6->ip6_dst;
            ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
      }
      /*
       * Put the packet into the sending queue of the outgoing interface
       * if it would fit in the MTU of the interface.
       */
      if (mb_copy->m_pkthdr.len < ifp->if_mtu || ifp->if_mtu < IPV6_MMTU) {
            dst6->sin6_len = sizeof(struct sockaddr_in6);
            dst6->sin6_family = AF_INET6;
            dst6->sin6_addr = ip6->ip6_dst;
            /*
             * We just call if_output instead of nd6_output here, since
             * we need no ND for a multicast forwarded packet...right?
             */
            error = (*ifp->if_output)(ifp, mb_copy,
                (struct sockaddr *)&ro.ro_dst, NULL);
#ifdef MRT6DEBUG
            if (mrt6debug & DEBUG_XMIT)
                  log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
                      mifp - mif6table, error);
#endif
      } else {
#ifdef MULTICAST_PMTUD
            icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
#else
#ifdef MRT6DEBUG
            if (mrt6debug & DEBUG_XMIT)
                  log(LOG_DEBUG,
                      "phyint_send: packet too big on %s o %s g %s"
                      " size %d(discarded)\n",
                      if_name(ifp),
                      ip6_sprintf(&ip6->ip6_src),
                      ip6_sprintf(&ip6->ip6_dst),
                      mb_copy->m_pkthdr.len);
#endif /* MRT6DEBUG */
            m_freem(mb_copy); /* simply discard the packet */
#endif
      }

      splx(s);
}

static int
register_send(ip6, mif, m)
      struct ip6_hdr *ip6;
      struct mif6 *mif;
      struct mbuf *m;
{
      struct mbuf *mm;
      int i, len = m->m_pkthdr.len;
      static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
      struct mrt6msg *im6;

#ifdef MRT6DEBUG
      if (mrt6debug)
            log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
                ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst));
#endif
      ++pim6stat.pim6s_snd_registers;

      /* Make a copy of the packet to send to the user level process */
      MGETHDR(mm, M_DONTWAIT, MT_HEADER);
      if (mm == NULL)
            return ENOBUFS;
      mm->m_pkthdr.rcvif = NULL;
      mm->m_data += max_linkhdr;
      mm->m_len = sizeof(struct ip6_hdr);

      if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
            m_freem(mm);
            return ENOBUFS;
      }
      i = MHLEN - M_LEADINGSPACE(mm);
      if (i > len)
            i = len;
      mm = m_pullup(mm, i);
      if (mm == NULL){
            m_freem(mm);
            return ENOBUFS;
      }
/* TODO: check it! */
      mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);

      /*
       * Send message to routing daemon
       */
      sin6.sin6_addr = ip6->ip6_src;

      im6 = mtod(mm, struct mrt6msg *);
      im6->im6_msgtype      = MRT6MSG_WHOLEPKT;
      im6->im6_mbz          = 0;

      im6->im6_mif = mif - mif6table;

      /* iif info is not given for reg. encap.n */
      mrt6stat.mrt6s_upcalls++;

      if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
#ifdef MRT6DEBUG
            if (mrt6debug)
                  log(LOG_WARNING,
                      "register_send: ip6_mrouter socket queue full\n");
#endif
            ++mrt6stat.mrt6s_upq_sockfull;
            return ENOBUFS;
      }
      return 0;
}

/*
 * PIM sparse mode hook
 * Receives the pim control messages, and passes them up to the listening
 * socket, using rip6_input.
 * The only message processed is the REGISTER pim message; the pim header
 * is stripped off, and the inner packet is passed to register_mforward.
 */
int
pim6_input(mp, offp, proto)
      struct mbuf **mp;
      int *offp, proto;
{
      struct pim *pim; /* pointer to a pim struct */
      struct ip6_hdr *ip6;
      int pimlen;
      struct mbuf *m = *mp;
      int minlen;
      int off = *offp;

      ++pim6stat.pim6s_rcv_total;

      ip6 = mtod(m, struct ip6_hdr *);
      pimlen = m->m_pkthdr.len - *offp;

      /*
       * Validate lengths
       */
      if (pimlen < PIM_MINLEN) {
            ++pim6stat.pim6s_rcv_tooshort;
#ifdef MRT6DEBUG
            if (mrt6debug & DEBUG_PIM)
                  log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
#endif
            m_freem(m);
            return(IPPROTO_DONE);
      }

      /*
       * if the packet is at least as big as a REGISTER, go ahead
       * and grab the PIM REGISTER header size, to avoid another
       * possible m_pullup() later.
       *
       * PIM_MINLEN       == pimhdr + u_int32 == 8
       * PIM6_REG_MINLEN   == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
       */
      minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;

      /*
       * Make sure that the IP6 and PIM headers in contiguous memory, and
       * possibly the PIM REGISTER header
       */
#ifndef PULLDOWN_TEST
      IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
      /* adjust pointer */
      ip6 = mtod(m, struct ip6_hdr *);

      /* adjust mbuf to point to the PIM header */
      pim = (struct pim *)((caddr_t)ip6 + off);
#else
      IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
      if (pim == NULL) {
            pim6stat.pim6s_rcv_tooshort++;
            return IPPROTO_DONE;
      }
#endif

#define PIM6_CHECKSUM
#ifdef PIM6_CHECKSUM
      {
            int cksumlen;

            /*
             * Validate checksum.
             * If PIM REGISTER, exclude the data packet
             */
            if (pim->pim_type == PIM_REGISTER)
                  cksumlen = PIM_MINLEN;
            else
                  cksumlen = pimlen;

            if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
                  ++pim6stat.pim6s_rcv_badsum;
#ifdef MRT6DEBUG
                  if (mrt6debug & DEBUG_PIM)
                        log(LOG_DEBUG,
                            "pim6_input: invalid checksum\n");
#endif
                  m_freem(m);
                  return(IPPROTO_DONE);
            }
      }
#endif /* PIM_CHECKSUM */

      /* PIM version check */
      if (pim->pim_ver != PIM_VERSION) {
            ++pim6stat.pim6s_rcv_badversion;
#ifdef MRT6DEBUG
            log(LOG_ERR,
                "pim6_input: incorrect version %d, expecting %d\n",
                pim->pim_ver, PIM_VERSION);
#endif
            m_freem(m);
            return(IPPROTO_DONE);
      }

      if (pim->pim_type == PIM_REGISTER) {
            /*
             * since this is a REGISTER, we'll make a copy of the register
             * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
             * routing daemon.
             */
            static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };

            struct mbuf *mcp;
            struct ip6_hdr *eip6;
            u_int32_t *reghdr;
            int rc;
      
            ++pim6stat.pim6s_rcv_registers;

            if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
#ifdef MRT6DEBUG
                  if (mrt6debug & DEBUG_PIM)
                        log(LOG_DEBUG,
                            "pim6_input: register mif not set: %d\n",
                            reg_mif_num);
#endif
                  m_freem(m);
                  return(IPPROTO_DONE);
            }
      
            reghdr = (u_int32_t *)(pim + 1);
      
            if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
                  goto pim6_input_to_daemon;

            /*
             * Validate length
             */
            if (pimlen < PIM6_REG_MINLEN) {
                  ++pim6stat.pim6s_rcv_tooshort;
                  ++pim6stat.pim6s_rcv_badregisters;
#ifdef MRT6DEBUG
                  log(LOG_ERR,
                      "pim6_input: register packet size too "
                      "small %d from %s\n",
                      pimlen, ip6_sprintf(&ip6->ip6_src));
#endif
                  m_freem(m);
                  return(IPPROTO_DONE);
            }
      
            eip6 = (struct ip6_hdr *) (reghdr + 1);
#ifdef MRT6DEBUG  
            if (mrt6debug & DEBUG_PIM)
                  log(LOG_DEBUG,
                      "pim6_input[register], eip6: %s -> %s, "
                      "eip6 plen %d\n",
                      ip6_sprintf(&eip6->ip6_src),
                      ip6_sprintf(&eip6->ip6_dst),
                      ntohs(eip6->ip6_plen));
#endif

            /* verify the version number of the inner packet */
            if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                  ++pim6stat.pim6s_rcv_badregisters;
#ifdef MRT6DEBUG
                  log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
                      "of the inner packet\n",
                      (eip6->ip6_vfc & IPV6_VERSION));
#endif
                  m_freem(m);
                  return(IPPROTO_NONE);
            }
      
            /* verify the inner packet is destined to a mcast group */
            if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
                  ++pim6stat.pim6s_rcv_badregisters;
#ifdef MRT6DEBUG
                  if (mrt6debug & DEBUG_PIM)
                        log(LOG_DEBUG,
                            "pim6_input: inner packet of register "
                            "is not multicast %s\n",
                            ip6_sprintf(&eip6->ip6_dst));
#endif
                  m_freem(m);
                  return(IPPROTO_DONE);
            }
      
            /*
             * make a copy of the whole header to pass to the daemon later.
             */
            mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
            if (mcp == NULL) {
#ifdef MRT6DEBUG
                  log(LOG_ERR,
                      "pim6_input: pim register: "
                      "could not copy register head\n");
#endif
                  m_freem(m);
                  return(IPPROTO_DONE);
            }
      
            /*
             * forward the inner ip6 packet; point m_data at the inner ip6.
             */
            m_adj(m, off + PIM_MINLEN);
#ifdef MRT6DEBUG
            if (mrt6debug & DEBUG_PIM) {
                  log(LOG_DEBUG,
                      "pim6_input: forwarding decapsulated register: "
                      "src %s, dst %s, mif %d\n",
                      ip6_sprintf(&eip6->ip6_src),
                      ip6_sprintf(&eip6->ip6_dst),
                      reg_mif_num);
            }
#endif

#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#if (__FreeBSD_version >= 410000)
            rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
                        dst.sin6_family, (int)NULL);
#else
            rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
                        (struct sockaddr *) &dst, NULL);

#endif
#else
            rc = looutput(mif6table[reg_mif_num].m6_ifp, m,
                        (struct sockaddr *) &dst,
                        (struct rtentry *) NULL);
#endif
      
            /* prepare the register head to send to the mrouting daemon */
            m = mcp;
      }

      /*
       * Pass the PIM message up to the daemon; if it is a register message
       * pass the 'head' only up to the daemon. This includes the
       * encapsulator ip6 header, pim header, register header and the
       * encapsulated ip6 header.
       */
  pim6_input_to_daemon:
      rip6_input(&m, offp, proto);
      return(IPPROTO_DONE);
}

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