The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netinet6/ip6_mroute.c

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    1 /*      $FreeBSD: releng/5.3/sys/netinet6/ip6_mroute.c 136588 2004-10-16 08:43:07Z cvs2svn $    */
    2 /*      $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $     */
    3 
    4 /*
    5  * Copyright (C) 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*      BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp     */
   34 
   35 /*
   36  * Copyright (c) 1989 Stephen Deering
   37  * Copyright (c) 1992, 1993
   38  *      The Regents of the University of California.  All rights reserved.
   39  *
   40  * This code is derived from software contributed to Berkeley by
   41  * Stephen Deering of Stanford University.
   42  *
   43  * Redistribution and use in source and binary forms, with or without
   44  * modification, are permitted provided that the following conditions
   45  * are met:
   46  * 1. Redistributions of source code must retain the above copyright
   47  *    notice, this list of conditions and the following disclaimer.
   48  * 2. Redistributions in binary form must reproduce the above copyright
   49  *    notice, this list of conditions and the following disclaimer in the
   50  *    documentation and/or other materials provided with the distribution.
   51  * 4. Neither the name of the University nor the names of its contributors
   52  *    may be used to endorse or promote products derived from this software
   53  *    without specific prior written permission.
   54  *
   55  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   65  * SUCH DAMAGE.
   66  *
   67  *      @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
   68  */
   69 
   70 /*
   71  * IP multicast forwarding procedures
   72  *
   73  * Written by David Waitzman, BBN Labs, August 1988.
   74  * Modified by Steve Deering, Stanford, February 1989.
   75  * Modified by Mark J. Steiglitz, Stanford, May, 1991
   76  * Modified by Van Jacobson, LBL, January 1993
   77  * Modified by Ajit Thyagarajan, PARC, August 1993
   78  * Modified by Bill Fenner, PARC, April 1994
   79  *
   80  * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
   81  */
   82 
   83 #include "opt_inet.h"
   84 #include "opt_inet6.h"
   85 
   86 #include <sys/param.h>
   87 #include <sys/callout.h>
   88 #include <sys/errno.h>
   89 #include <sys/kernel.h>
   90 #include <sys/lock.h>
   91 #include <sys/malloc.h>
   92 #include <sys/mbuf.h>
   93 #include <sys/protosw.h>
   94 #include <sys/signalvar.h>
   95 #include <sys/socket.h>
   96 #include <sys/socketvar.h>
   97 #include <sys/sockio.h>
   98 #include <sys/sx.h>
   99 #include <sys/syslog.h>
  100 #include <sys/systm.h>
  101 #include <sys/time.h>
  102 
  103 #include <net/if.h>
  104 #include <net/raw_cb.h>
  105 #include <net/route.h>
  106 
  107 #include <netinet/in.h>
  108 #include <netinet/in_var.h>
  109 
  110 #include <netinet/ip6.h>
  111 #include <netinet6/ip6_var.h>
  112 #include <netinet6/nd6.h>
  113 #include <netinet6/ip6_mroute.h>
  114 #include <netinet6/pim6.h>
  115 #include <netinet6/pim6_var.h>
  116 
  117 #include <net/net_osdep.h>
  118 
  119 static MALLOC_DEFINE(M_MRTABLE, "mf6c", "multicast forwarding cache entry");
  120 
  121 #define M_HASCL(m) ((m)->m_flags & M_EXT)
  122 
  123 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *));
  124 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *));
  125 
  126 static int set_pim6 __P((int *));
  127 static int socket_send __P((struct socket *, struct mbuf *,
  128             struct sockaddr_in6 *));
  129 static int register_send __P((struct ip6_hdr *, struct mif6 *,
  130             struct mbuf *));
  131 
  132 /*
  133  * Globals.  All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static,
  134  * except for netstat or debugging purposes.
  135  */
  136 struct socket  *ip6_mrouter = NULL;
  137 int             ip6_mrouter_ver = 0;
  138 int             ip6_mrtproto = IPPROTO_PIM;    /* for netstat only */
  139 struct mrt6stat mrt6stat;
  140 
  141 #define NO_RTE_FOUND    0x1
  142 #define RTE_FOUND       0x2
  143 
  144 struct mf6c     *mf6ctable[MF6CTBLSIZ];
  145 u_char          n6expire[MF6CTBLSIZ];
  146 static struct mif6 mif6table[MAXMIFS];
  147 #ifdef MRT6DEBUG
  148 u_int           mrt6debug = 0;    /* debug level        */
  149 #define DEBUG_MFC       0x02
  150 #define DEBUG_FORWARD   0x04
  151 #define DEBUG_EXPIRE    0x08
  152 #define DEBUG_XMIT      0x10
  153 #define DEBUG_REG       0x20
  154 #define DEBUG_PIM       0x40
  155 #endif
  156 
  157 static void     expire_upcalls __P((void *));
  158 #define EXPIRE_TIMEOUT  (hz / 4)        /* 4x / second */
  159 #define UPCALL_EXPIRE   6               /* number of timeouts */
  160 
  161 #ifdef INET
  162 #ifdef MROUTING
  163 extern struct socket *ip_mrouter;
  164 #endif
  165 #endif
  166 
  167 /*
  168  * 'Interfaces' associated with decapsulator (so we can tell
  169  * packets that went through it from ones that get reflected
  170  * by a broken gateway).  These interfaces are never linked into
  171  * the system ifnet list & no routes point to them.  I.e., packets
  172  * can't be sent this way.  They only exist as a placeholder for
  173  * multicast source verification.
  174  */
  175 struct ifnet multicast_register_if;
  176 
  177 #define ENCAP_HOPS 64
  178 
  179 /*
  180  * Private variables.
  181  */
  182 static mifi_t nummifs = 0;
  183 static mifi_t reg_mif_num = (mifi_t)-1;
  184 
  185 static struct pim6stat pim6stat;
  186 static int pim6;
  187 
  188 /*
  189  * Hash function for a source, group entry
  190  */
  191 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
  192                                    (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
  193                                    (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
  194                                    (g).s6_addr32[2] ^ (g).s6_addr32[3])
  195 
  196 /*
  197  * Find a route for a given origin IPv6 address and Multicast group address.
  198  * Quality of service parameter to be added in the future!!!
  199  */
  200 
  201 #define MF6CFIND(o, g, rt) do { \
  202         struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
  203         rt = NULL; \
  204         mrt6stat.mrt6s_mfc_lookups++; \
  205         while (_rt) { \
  206                 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
  207                     IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
  208                     (_rt->mf6c_stall == NULL)) { \
  209                         rt = _rt; \
  210                         break; \
  211                 } \
  212                 _rt = _rt->mf6c_next; \
  213         } \
  214         if (rt == NULL) { \
  215                 mrt6stat.mrt6s_mfc_misses++; \
  216         } \
  217 } while (/*CONSTCOND*/ 0)
  218 
  219 /*
  220  * Macros to compute elapsed time efficiently
  221  * Borrowed from Van Jacobson's scheduling code
  222  */
  223 #define TV_DELTA(a, b, delta) do { \
  224             int xxs; \
  225                 \
  226             delta = (a).tv_usec - (b).tv_usec; \
  227             if ((xxs = (a).tv_sec - (b).tv_sec)) { \
  228                switch (xxs) { \
  229                       case 2: \
  230                           delta += 1000000; \
  231                               /* FALLTHROUGH */ \
  232                       case 1: \
  233                           delta += 1000000; \
  234                           break; \
  235                       default: \
  236                           delta += (1000000 * xxs); \
  237                } \
  238             } \
  239 } while (/*CONSTCOND*/ 0)
  240 
  241 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
  242               (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
  243 
  244 #ifdef UPCALL_TIMING
  245 #define UPCALL_MAX      50
  246 u_long upcall_data[UPCALL_MAX + 1];
  247 static void collate();
  248 #endif /* UPCALL_TIMING */
  249 
  250 static int get_sg_cnt __P((struct sioc_sg_req6 *));
  251 static int get_mif6_cnt __P((struct sioc_mif_req6 *));
  252 static int ip6_mrouter_init __P((struct socket *, int, int));
  253 static int add_m6if __P((struct mif6ctl *));
  254 static int del_m6if __P((mifi_t *));
  255 static int add_m6fc __P((struct mf6cctl *));
  256 static int del_m6fc __P((struct mf6cctl *));
  257 
  258 static struct callout expire_upcalls_ch;
  259 
  260 /*
  261  * Handle MRT setsockopt commands to modify the multicast routing tables.
  262  */
  263 int
  264 ip6_mrouter_set(so, sopt)
  265         struct socket *so;
  266         struct sockopt *sopt;
  267 {
  268         int error = 0;
  269         int optval;
  270         struct mif6ctl mifc;
  271         struct mf6cctl mfcc;
  272         mifi_t mifi;
  273 
  274         if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
  275                 return (EACCES);
  276 
  277         switch (sopt->sopt_name) {
  278         case MRT6_INIT:
  279 #ifdef MRT6_OINIT
  280         case MRT6_OINIT:
  281 #endif
  282                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  283                     sizeof(optval));
  284                 if (error)
  285                         break;
  286                 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
  287                 break;
  288         case MRT6_DONE:
  289                 error = ip6_mrouter_done();
  290                 break;
  291         case MRT6_ADD_MIF:
  292                 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
  293                 if (error)
  294                         break;
  295                 error = add_m6if(&mifc);
  296                 break;
  297         case MRT6_ADD_MFC:
  298                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  299                 if (error)
  300                         break;
  301                 error = add_m6fc(&mfcc);
  302                 break;
  303         case MRT6_DEL_MFC:
  304                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  305                 if (error)
  306                         break;
  307                 error = del_m6fc(&mfcc);
  308                 break;
  309         case MRT6_DEL_MIF:
  310                 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
  311                 if (error)
  312                         break;
  313                 error = del_m6if(&mifi);
  314                 break;
  315         case MRT6_PIM:
  316                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  317                     sizeof(optval));
  318                 if (error)
  319                         break;
  320                 error = set_pim6(&optval);
  321                 break;
  322         default:
  323                 error = EOPNOTSUPP;
  324                 break;
  325         }
  326 
  327         return (error);
  328 }
  329 
  330 /*
  331  * Handle MRT getsockopt commands
  332  */
  333 int
  334 ip6_mrouter_get(so, sopt)
  335         struct socket *so;
  336         struct sockopt *sopt;
  337 {
  338         int error = 0;
  339 
  340         if (so != ip6_mrouter)
  341                 return (EACCES);
  342 
  343         switch (sopt->sopt_name) {
  344                 case MRT6_PIM:
  345                         error = sooptcopyout(sopt, &pim6, sizeof(pim6));
  346                         break;
  347         }
  348         return (error);
  349 }
  350 
  351 /*
  352  * Handle ioctl commands to obtain information from the cache
  353  */
  354 int
  355 mrt6_ioctl(cmd, data)
  356         int cmd;
  357         caddr_t data;
  358 {
  359         switch (cmd) {
  360         case SIOCGETSGCNT_IN6:
  361                 return (get_sg_cnt((struct sioc_sg_req6 *)data));
  362         case SIOCGETMIFCNT_IN6:
  363                 return (get_mif6_cnt((struct sioc_mif_req6 *)data));
  364         default:
  365                 return (EINVAL);
  366         }
  367 }
  368 
  369 /*
  370  * returns the packet, byte, rpf-failure count for the source group provided
  371  */
  372 static int
  373 get_sg_cnt(req)
  374         struct sioc_sg_req6 *req;
  375 {
  376         struct mf6c *rt;
  377         int s;
  378 
  379         s = splnet();
  380         MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
  381         splx(s);
  382         if (rt != NULL) {
  383                 req->pktcnt = rt->mf6c_pkt_cnt;
  384                 req->bytecnt = rt->mf6c_byte_cnt;
  385                 req->wrong_if = rt->mf6c_wrong_if;
  386         } else
  387                 return (ESRCH);
  388 #if 0
  389                 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
  390 #endif
  391 
  392         return (0);
  393 }
  394 
  395 /*
  396  * returns the input and output packet and byte counts on the mif provided
  397  */
  398 static int
  399 get_mif6_cnt(req)
  400         struct sioc_mif_req6 *req;
  401 {
  402         mifi_t mifi = req->mifi;
  403 
  404         if (mifi >= nummifs)
  405                 return (EINVAL);
  406 
  407         req->icount = mif6table[mifi].m6_pkt_in;
  408         req->ocount = mif6table[mifi].m6_pkt_out;
  409         req->ibytes = mif6table[mifi].m6_bytes_in;
  410         req->obytes = mif6table[mifi].m6_bytes_out;
  411 
  412         return (0);
  413 }
  414 
  415 static int
  416 set_pim6(i)
  417         int *i;
  418 {
  419         if ((*i != 1) && (*i != 0))
  420                 return (EINVAL);
  421 
  422         pim6 = *i;
  423 
  424         return (0);
  425 }
  426 
  427 /*
  428  * Enable multicast routing
  429  */
  430 static int
  431 ip6_mrouter_init(so, v, cmd)
  432         struct socket *so;
  433         int v;
  434         int cmd;
  435 {
  436 #ifdef MRT6DEBUG
  437         if (mrt6debug)
  438                 log(LOG_DEBUG,
  439                     "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
  440                     so->so_type, so->so_proto->pr_protocol);
  441 #endif
  442 
  443         if (so->so_type != SOCK_RAW ||
  444             so->so_proto->pr_protocol != IPPROTO_ICMPV6)
  445                 return (EOPNOTSUPP);
  446 
  447         if (v != 1)
  448                 return (ENOPROTOOPT);
  449 
  450         if (ip6_mrouter != NULL)
  451                 return (EADDRINUSE);
  452 
  453         ip6_mrouter = so;
  454         ip6_mrouter_ver = cmd;
  455 
  456         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  457         bzero((caddr_t)n6expire, sizeof(n6expire));
  458 
  459         pim6 = 0;/* used for stubbing out/in pim stuff */
  460 
  461         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
  462             expire_upcalls, NULL);
  463 
  464 #ifdef MRT6DEBUG
  465         if (mrt6debug)
  466                 log(LOG_DEBUG, "ip6_mrouter_init\n");
  467 #endif
  468 
  469         return (0);
  470 }
  471 
  472 /*
  473  * Disable multicast routing
  474  */
  475 int
  476 ip6_mrouter_done()
  477 {
  478         mifi_t mifi;
  479         int i;
  480         struct ifnet *ifp;
  481         struct in6_ifreq ifr;
  482         struct mf6c *rt;
  483         struct rtdetq *rte;
  484         int s;
  485 
  486         s = splnet();
  487 
  488         /*
  489          * For each phyint in use, disable promiscuous reception of all IPv6
  490          * multicasts.
  491          */
  492 #ifdef INET
  493 #ifdef MROUTING
  494         /*
  495          * If there is still IPv4 multicast routing daemon,
  496          * we remain interfaces to receive all muliticasted packets.
  497          * XXX: there may be an interface in which the IPv4 multicast
  498          * daemon is not interested...
  499          */
  500         if (!ip_mrouter)
  501 #endif
  502 #endif
  503         {
  504                 for (mifi = 0; mifi < nummifs; mifi++) {
  505                         if (mif6table[mifi].m6_ifp &&
  506                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
  507                                 ifr.ifr_addr.sin6_family = AF_INET6;
  508                                 ifr.ifr_addr.sin6_addr = in6addr_any;
  509                                 ifp = mif6table[mifi].m6_ifp;
  510                                 (*ifp->if_ioctl)(ifp, SIOCDELMULTI,
  511                                                  (caddr_t)&ifr);
  512                         }
  513                 }
  514         }
  515 #ifdef notyet
  516         bzero((caddr_t)qtable, sizeof(qtable));
  517         bzero((caddr_t)tbftable, sizeof(tbftable));
  518 #endif
  519         bzero((caddr_t)mif6table, sizeof(mif6table));
  520         nummifs = 0;
  521 
  522         pim6 = 0; /* used to stub out/in pim specific code */
  523 
  524         callout_stop(&expire_upcalls_ch);
  525 
  526         /*
  527          * Free all multicast forwarding cache entries.
  528          */
  529         for (i = 0; i < MF6CTBLSIZ; i++) {
  530                 rt = mf6ctable[i];
  531                 while (rt) {
  532                         struct mf6c *frt;
  533 
  534                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  535                                 struct rtdetq *n = rte->next;
  536 
  537                                 m_free(rte->m);
  538                                 free(rte, M_MRTABLE);
  539                                 rte = n;
  540                         }
  541                         frt = rt;
  542                         rt = rt->mf6c_next;
  543                         free(frt, M_MRTABLE);
  544                 }
  545         }
  546 
  547         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  548 
  549         /*
  550          * Reset de-encapsulation cache
  551          */
  552         reg_mif_num = -1;
  553 
  554         ip6_mrouter = NULL;
  555         ip6_mrouter_ver = 0;
  556 
  557         splx(s);
  558 
  559 #ifdef MRT6DEBUG
  560         if (mrt6debug)
  561                 log(LOG_DEBUG, "ip6_mrouter_done\n");
  562 #endif
  563 
  564         return (0);
  565 }
  566 
  567 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
  568 
  569 /*
  570  * Add a mif to the mif table
  571  */
  572 static int
  573 add_m6if(mifcp)
  574         struct mif6ctl *mifcp;
  575 {
  576         struct mif6 *mifp;
  577         struct ifnet *ifp;
  578         int error, s;
  579 #ifdef notyet
  580         struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi;
  581 #endif
  582 
  583         if (mifcp->mif6c_mifi >= MAXMIFS)
  584                 return (EINVAL);
  585         mifp = mif6table + mifcp->mif6c_mifi;
  586         if (mifp->m6_ifp)
  587                 return (EADDRINUSE); /* XXX: is it appropriate? */
  588         if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
  589                 return (ENXIO);
  590         ifp = ifnet_byindex(mifcp->mif6c_pifi);
  591 
  592         if (mifcp->mif6c_flags & MIFF_REGISTER) {
  593                 if (reg_mif_num == (mifi_t)-1) {
  594                         strlcpy(multicast_register_if.if_xname, "register_mif",
  595                             IFNAMSIZ);
  596                         multicast_register_if.if_flags |= IFF_LOOPBACK;
  597                         multicast_register_if.if_index = mifcp->mif6c_mifi;
  598                         reg_mif_num = mifcp->mif6c_mifi;
  599                 }
  600 
  601                 ifp = &multicast_register_if;
  602 
  603         } /* if REGISTER */
  604         else {
  605                 /* Make sure the interface supports multicast */
  606                 if ((ifp->if_flags & IFF_MULTICAST) == 0)
  607                         return (EOPNOTSUPP);
  608 
  609                 s = splnet();
  610                 error = if_allmulti(ifp, 1);
  611                 splx(s);
  612                 if (error)
  613                         return (error);
  614         }
  615 
  616         s = splnet();
  617         mifp->m6_flags     = mifcp->mif6c_flags;
  618         mifp->m6_ifp       = ifp;
  619 #ifdef notyet
  620         /* scaling up here allows division by 1024 in critical code */
  621         mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000;
  622 #endif
  623         /* initialize per mif pkt counters */
  624         mifp->m6_pkt_in    = 0;
  625         mifp->m6_pkt_out   = 0;
  626         mifp->m6_bytes_in  = 0;
  627         mifp->m6_bytes_out = 0;
  628         splx(s);
  629 
  630         /* Adjust nummifs up if the mifi is higher than nummifs */
  631         if (nummifs <= mifcp->mif6c_mifi)
  632                 nummifs = mifcp->mif6c_mifi + 1;
  633 
  634 #ifdef MRT6DEBUG
  635         if (mrt6debug)
  636                 log(LOG_DEBUG,
  637                     "add_mif #%d, phyint %s\n",
  638                     mifcp->mif6c_mifi,
  639                     ifp->if_xname);
  640 #endif
  641 
  642         return (0);
  643 }
  644 
  645 /*
  646  * Delete a mif from the mif table
  647  */
  648 static int
  649 del_m6if(mifip)
  650         mifi_t *mifip;
  651 {
  652         struct mif6 *mifp = mif6table + *mifip;
  653         mifi_t mifi;
  654         struct ifnet *ifp;
  655         int s;
  656 
  657         if (*mifip >= nummifs)
  658                 return (EINVAL);
  659         if (mifp->m6_ifp == NULL)
  660                 return (EINVAL);
  661 
  662         s = splnet();
  663 
  664         if (!(mifp->m6_flags & MIFF_REGISTER)) {
  665                 /*
  666                  * XXX: what if there is yet IPv4 multicast daemon
  667                  *      using the interface?
  668                  */
  669                 ifp = mifp->m6_ifp;
  670 
  671                 if_allmulti(ifp, 0);
  672         }
  673 
  674 #ifdef notyet
  675         bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip]));
  676         bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf)));
  677 #endif
  678         bzero((caddr_t)mifp, sizeof(*mifp));
  679 
  680         /* Adjust nummifs down */
  681         for (mifi = nummifs; mifi > 0; mifi--)
  682                 if (mif6table[mifi - 1].m6_ifp)
  683                         break;
  684         nummifs = mifi;
  685 
  686         splx(s);
  687 
  688 #ifdef MRT6DEBUG
  689         if (mrt6debug)
  690                 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
  691 #endif
  692 
  693         return (0);
  694 }
  695 
  696 /*
  697  * Add an mfc entry
  698  */
  699 static int
  700 add_m6fc(mfccp)
  701         struct mf6cctl *mfccp;
  702 {
  703         struct mf6c *rt;
  704         u_long hash;
  705         struct rtdetq *rte;
  706         u_short nstl;
  707         int s;
  708 
  709         MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
  710                  mfccp->mf6cc_mcastgrp.sin6_addr, rt);
  711 
  712         /* If an entry already exists, just update the fields */
  713         if (rt) {
  714 #ifdef MRT6DEBUG
  715                 if (mrt6debug & DEBUG_MFC)
  716                         log(LOG_DEBUG,
  717                             "add_m6fc no upcall h %d o %s g %s p %x\n",
  718                             ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
  719                             ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
  720                             mfccp->mf6cc_parent);
  721 #endif
  722 
  723                 s = splnet();
  724                 rt->mf6c_parent = mfccp->mf6cc_parent;
  725                 rt->mf6c_ifset = mfccp->mf6cc_ifset;
  726                 splx(s);
  727                 return (0);
  728         }
  729 
  730         /*
  731          * Find the entry for which the upcall was made and update
  732          */
  733         s = splnet();
  734         hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
  735                         mfccp->mf6cc_mcastgrp.sin6_addr);
  736         for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
  737                 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  738                                        &mfccp->mf6cc_origin.sin6_addr) &&
  739                     IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  740                                        &mfccp->mf6cc_mcastgrp.sin6_addr) &&
  741                     (rt->mf6c_stall != NULL)) {
  742 
  743                         if (nstl++)
  744                                 log(LOG_ERR,
  745                                     "add_m6fc: %s o %s g %s p %x dbx %p\n",
  746                                     "multiple kernel entries",
  747                                     ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
  748                                     ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
  749                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  750 
  751 #ifdef MRT6DEBUG
  752                         if (mrt6debug & DEBUG_MFC)
  753                                 log(LOG_DEBUG,
  754                                     "add_m6fc o %s g %s p %x dbg %x\n",
  755                                     ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
  756                                     ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
  757                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  758 #endif
  759 
  760                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  761                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  762                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  763                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  764                         /* initialize pkt counters per src-grp */
  765                         rt->mf6c_pkt_cnt    = 0;
  766                         rt->mf6c_byte_cnt   = 0;
  767                         rt->mf6c_wrong_if   = 0;
  768 
  769                         rt->mf6c_expire = 0;    /* Don't clean this guy up */
  770                         n6expire[hash]--;
  771 
  772                         /* free packets Qed at the end of this entry */
  773                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  774                                 struct rtdetq *n = rte->next;
  775                                 ip6_mdq(rte->m, rte->ifp, rt);
  776                                 m_freem(rte->m);
  777 #ifdef UPCALL_TIMING
  778                                 collate(&(rte->t));
  779 #endif /* UPCALL_TIMING */
  780                                 free(rte, M_MRTABLE);
  781                                 rte = n;
  782                         }
  783                         rt->mf6c_stall = NULL;
  784                 }
  785         }
  786 
  787         /*
  788          * It is possible that an entry is being inserted without an upcall
  789          */
  790         if (nstl == 0) {
  791 #ifdef MRT6DEBUG
  792                 if (mrt6debug & DEBUG_MFC)
  793                         log(LOG_DEBUG,
  794                             "add_mfc no upcall h %d o %s g %s p %x\n",
  795                             hash,
  796                             ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
  797                             ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
  798                             mfccp->mf6cc_parent);
  799 #endif
  800 
  801                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
  802 
  803                         if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  804                                                &mfccp->mf6cc_origin.sin6_addr)&&
  805                             IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  806                                                &mfccp->mf6cc_mcastgrp.sin6_addr)) {
  807 
  808                                 rt->mf6c_origin     = mfccp->mf6cc_origin;
  809                                 rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  810                                 rt->mf6c_parent     = mfccp->mf6cc_parent;
  811                                 rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  812                                 /* initialize pkt counters per src-grp */
  813                                 rt->mf6c_pkt_cnt    = 0;
  814                                 rt->mf6c_byte_cnt   = 0;
  815                                 rt->mf6c_wrong_if   = 0;
  816 
  817                                 if (rt->mf6c_expire)
  818                                         n6expire[hash]--;
  819                                 rt->mf6c_expire    = 0;
  820                         }
  821                 }
  822                 if (rt == NULL) {
  823                         /* no upcall, so make a new entry */
  824                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE,
  825                                                   M_NOWAIT);
  826                         if (rt == NULL) {
  827                                 splx(s);
  828                                 return (ENOBUFS);
  829                         }
  830 
  831                         /* insert new entry at head of hash chain */
  832                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  833                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  834                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  835                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  836                         /* initialize pkt counters per src-grp */
  837                         rt->mf6c_pkt_cnt    = 0;
  838                         rt->mf6c_byte_cnt   = 0;
  839                         rt->mf6c_wrong_if   = 0;
  840                         rt->mf6c_expire     = 0;
  841                         rt->mf6c_stall = NULL;
  842 
  843                         /* link into table */
  844                         rt->mf6c_next  = mf6ctable[hash];
  845                         mf6ctable[hash] = rt;
  846                 }
  847         }
  848         splx(s);
  849         return (0);
  850 }
  851 
  852 #ifdef UPCALL_TIMING
  853 /*
  854  * collect delay statistics on the upcalls
  855  */
  856 static void
  857 collate(t)
  858         struct timeval *t;
  859 {
  860         u_long d;
  861         struct timeval tp;
  862         u_long delta;
  863 
  864         GET_TIME(tp);
  865 
  866         if (TV_LT(*t, tp))
  867         {
  868                 TV_DELTA(tp, *t, delta);
  869 
  870                 d = delta >> 10;
  871                 if (d > UPCALL_MAX)
  872                         d = UPCALL_MAX;
  873 
  874                 ++upcall_data[d];
  875         }
  876 }
  877 #endif /* UPCALL_TIMING */
  878 
  879 /*
  880  * Delete an mfc entry
  881  */
  882 static int
  883 del_m6fc(mfccp)
  884         struct mf6cctl *mfccp;
  885 {
  886         struct sockaddr_in6     origin;
  887         struct sockaddr_in6     mcastgrp;
  888         struct mf6c             *rt;
  889         struct mf6c             **nptr;
  890         u_long          hash;
  891         int s;
  892 
  893         origin = mfccp->mf6cc_origin;
  894         mcastgrp = mfccp->mf6cc_mcastgrp;
  895         hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
  896 
  897 #ifdef MRT6DEBUG
  898         if (mrt6debug & DEBUG_MFC)
  899                 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
  900                     ip6_sprintf(&origin.sin6_addr),
  901                     ip6_sprintf(&mcastgrp.sin6_addr));
  902 #endif
  903 
  904         s = splnet();
  905 
  906         nptr = &mf6ctable[hash];
  907         while ((rt = *nptr) != NULL) {
  908                 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
  909                                        &rt->mf6c_origin.sin6_addr) &&
  910                     IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
  911                                        &rt->mf6c_mcastgrp.sin6_addr) &&
  912                     rt->mf6c_stall == NULL)
  913                         break;
  914 
  915                 nptr = &rt->mf6c_next;
  916         }
  917         if (rt == NULL) {
  918                 splx(s);
  919                 return (EADDRNOTAVAIL);
  920         }
  921 
  922         *nptr = rt->mf6c_next;
  923         free(rt, M_MRTABLE);
  924 
  925         splx(s);
  926 
  927         return (0);
  928 }
  929 
  930 static int
  931 socket_send(s, mm, src)
  932         struct socket *s;
  933         struct mbuf *mm;
  934         struct sockaddr_in6 *src;
  935 {
  936         if (s) {
  937                 if (sbappendaddr(&s->so_rcv,
  938                                  (struct sockaddr *)src,
  939                                  mm, (struct mbuf *)0) != 0) {
  940                         sorwakeup(s);
  941                         return (0);
  942                 }
  943         }
  944         m_freem(mm);
  945         return (-1);
  946 }
  947 
  948 /*
  949  * IPv6 multicast forwarding function. This function assumes that the packet
  950  * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
  951  * pointed to by "ifp", and the packet is to be relayed to other networks
  952  * that have members of the packet's destination IPv6 multicast group.
  953  *
  954  * The packet is returned unscathed to the caller, unless it is
  955  * erroneous, in which case a non-zero return value tells the caller to
  956  * discard it.
  957  */
  958 
  959 int
  960 ip6_mforward(ip6, ifp, m)
  961         struct ip6_hdr *ip6;
  962         struct ifnet *ifp;
  963         struct mbuf *m;
  964 {
  965         struct mf6c *rt;
  966         struct mif6 *mifp;
  967         struct mbuf *mm;
  968         int s;
  969         mifi_t mifi;
  970 
  971 #ifdef MRT6DEBUG
  972         if (mrt6debug & DEBUG_FORWARD)
  973                 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
  974                     ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst),
  975                     ifp->if_index);
  976 #endif
  977 
  978         /*
  979          * Don't forward a packet with Hop limit of zero or one,
  980          * or a packet destined to a local-only group.
  981          */
  982         if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
  983             IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
  984                 return (0);
  985         ip6->ip6_hlim--;
  986 
  987         /*
  988          * Source address check: do not forward packets with unspecified
  989          * source. It was discussed in July 2000, on ipngwg mailing list.
  990          * This is rather more serious than unicast cases, because some
  991          * MLD packets can be sent with the unspecified source address
  992          * (although such packets must normally set 1 to the hop limit field).
  993          */
  994         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
  995                 ip6stat.ip6s_cantforward++;
  996                 if (ip6_log_time + ip6_log_interval < time_second) {
  997                         ip6_log_time = time_second;
  998                         log(LOG_DEBUG,
  999                             "cannot forward "
 1000                             "from %s to %s nxt %d received on %s\n",
 1001                             ip6_sprintf(&ip6->ip6_src),
 1002                             ip6_sprintf(&ip6->ip6_dst),
 1003                             ip6->ip6_nxt,
 1004                             if_name(m->m_pkthdr.rcvif));
 1005                 }
 1006                 return (0);
 1007         }
 1008 
 1009         /*
 1010          * Determine forwarding mifs from the forwarding cache table
 1011          */
 1012         s = splnet();
 1013         MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
 1014 
 1015         /* Entry exists, so forward if necessary */
 1016         if (rt) {
 1017                 splx(s);
 1018                 return (ip6_mdq(m, ifp, rt));
 1019         } else {
 1020                 /*
 1021                  * If we don't have a route for packet's origin,
 1022                  * Make a copy of the packet &
 1023                  * send message to routing daemon
 1024                  */
 1025 
 1026                 struct mbuf *mb0;
 1027                 struct rtdetq *rte;
 1028                 u_long hash;
 1029 /*              int i, npkts;*/
 1030 #ifdef UPCALL_TIMING
 1031                 struct timeval tp;
 1032 
 1033                 GET_TIME(tp);
 1034 #endif /* UPCALL_TIMING */
 1035 
 1036                 mrt6stat.mrt6s_no_route++;
 1037 #ifdef MRT6DEBUG
 1038                 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
 1039                         log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
 1040                             ip6_sprintf(&ip6->ip6_src),
 1041                             ip6_sprintf(&ip6->ip6_dst));
 1042 #endif
 1043 
 1044                 /*
 1045                  * Allocate mbufs early so that we don't do extra work if we
 1046                  * are just going to fail anyway.
 1047                  */
 1048                 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE,
 1049                                               M_NOWAIT);
 1050                 if (rte == NULL) {
 1051                         splx(s);
 1052                         return (ENOBUFS);
 1053                 }
 1054                 mb0 = m_copy(m, 0, M_COPYALL);
 1055                 /*
 1056                  * Pullup packet header if needed before storing it,
 1057                  * as other references may modify it in the meantime.
 1058                  */
 1059                 if (mb0 &&
 1060                     (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
 1061                         mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
 1062                 if (mb0 == NULL) {
 1063                         free(rte, M_MRTABLE);
 1064                         splx(s);
 1065                         return (ENOBUFS);
 1066                 }
 1067 
 1068                 /* is there an upcall waiting for this packet? */
 1069                 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
 1070                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
 1071                         if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
 1072                                                &rt->mf6c_origin.sin6_addr) &&
 1073                             IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
 1074                                                &rt->mf6c_mcastgrp.sin6_addr) &&
 1075                             (rt->mf6c_stall != NULL))
 1076                                 break;
 1077                 }
 1078 
 1079                 if (rt == NULL) {
 1080                         struct mrt6msg *im;
 1081 #ifdef MRT6_OINIT
 1082                         struct omrt6msg *oim;
 1083 #endif
 1084 
 1085                         /* no upcall, so make a new entry */
 1086                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE,
 1087                                                   M_NOWAIT);
 1088                         if (rt == NULL) {
 1089                                 free(rte, M_MRTABLE);
 1090                                 m_freem(mb0);
 1091                                 splx(s);
 1092                                 return (ENOBUFS);
 1093                         }
 1094                         /*
 1095                          * Make a copy of the header to send to the user
 1096                          * level process
 1097                          */
 1098                         mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
 1099 
 1100                         if (mm == NULL) {
 1101                                 free(rte, M_MRTABLE);
 1102                                 m_freem(mb0);
 1103                                 free(rt, M_MRTABLE);
 1104                                 splx(s);
 1105                                 return (ENOBUFS);
 1106                         }
 1107 
 1108                         /*
 1109                          * Send message to routing daemon
 1110                          */
 1111                         sin6.sin6_addr = ip6->ip6_src;
 1112 
 1113                         im = NULL;
 1114 #ifdef MRT6_OINIT
 1115                         oim = NULL;
 1116 #endif
 1117                         switch (ip6_mrouter_ver) {
 1118 #ifdef MRT6_OINIT
 1119                         case MRT6_OINIT:
 1120                                 oim = mtod(mm, struct omrt6msg *);
 1121                                 oim->im6_msgtype = MRT6MSG_NOCACHE;
 1122                                 oim->im6_mbz = 0;
 1123                                 break;
 1124 #endif
 1125                         case MRT6_INIT:
 1126                                 im = mtod(mm, struct mrt6msg *);
 1127                                 im->im6_msgtype = MRT6MSG_NOCACHE;
 1128                                 im->im6_mbz = 0;
 1129                                 break;
 1130                         default:
 1131                                 free(rte, M_MRTABLE);
 1132                                 m_freem(mb0);
 1133                                 free(rt, M_MRTABLE);
 1134                                 splx(s);
 1135                                 return (EINVAL);
 1136                         }
 1137 
 1138 #ifdef MRT6DEBUG
 1139                         if (mrt6debug & DEBUG_FORWARD)
 1140                                 log(LOG_DEBUG,
 1141                                     "getting the iif info in the kernel\n");
 1142 #endif
 1143 
 1144                         for (mifp = mif6table, mifi = 0;
 1145                              mifi < nummifs && mifp->m6_ifp != ifp;
 1146                              mifp++, mifi++)
 1147                                 ;
 1148 
 1149                         switch (ip6_mrouter_ver) {
 1150 #ifdef MRT6_OINIT
 1151                         case MRT6_OINIT:
 1152                                 oim->im6_mif = mifi;
 1153                                 break;
 1154 #endif
 1155                         case MRT6_INIT:
 1156                                 im->im6_mif = mifi;
 1157                                 break;
 1158                         }
 1159 
 1160                         if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1161                                 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
 1162                                     "socket queue full\n");
 1163                                 mrt6stat.mrt6s_upq_sockfull++;
 1164                                 free(rte, M_MRTABLE);
 1165                                 m_freem(mb0);
 1166                                 free(rt, M_MRTABLE);
 1167                                 splx(s);
 1168                                 return (ENOBUFS);
 1169                         }
 1170 
 1171                         mrt6stat.mrt6s_upcalls++;
 1172 
 1173                         /* insert new entry at head of hash chain */
 1174                         bzero(rt, sizeof(*rt));
 1175                         rt->mf6c_origin.sin6_family = AF_INET6;
 1176                         rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
 1177                         rt->mf6c_origin.sin6_addr = ip6->ip6_src;
 1178                         rt->mf6c_mcastgrp.sin6_family = AF_INET6;
 1179                         rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
 1180                         rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
 1181                         rt->mf6c_expire = UPCALL_EXPIRE;
 1182                         n6expire[hash]++;
 1183                         rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
 1184 
 1185                         /* link into table */
 1186                         rt->mf6c_next  = mf6ctable[hash];
 1187                         mf6ctable[hash] = rt;
 1188                         /* Add this entry to the end of the queue */
 1189                         rt->mf6c_stall = rte;
 1190                 } else {
 1191                         /* determine if q has overflowed */
 1192                         struct rtdetq **p;
 1193                         int npkts = 0;
 1194 
 1195                         for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
 1196                                 if (++npkts > MAX_UPQ6) {
 1197                                         mrt6stat.mrt6s_upq_ovflw++;
 1198                                         free(rte, M_MRTABLE);
 1199                                         m_freem(mb0);
 1200                                         splx(s);
 1201                                         return (0);
 1202                                 }
 1203 
 1204                         /* Add this entry to the end of the queue */
 1205                         *p = rte;
 1206                 }
 1207 
 1208                 rte->next = NULL;
 1209                 rte->m = mb0;
 1210                 rte->ifp = ifp;
 1211 #ifdef UPCALL_TIMING
 1212                 rte->t = tp;
 1213 #endif /* UPCALL_TIMING */
 1214 
 1215                 splx(s);
 1216 
 1217                 return (0);
 1218         }
 1219 }
 1220 
 1221 /*
 1222  * Clean up cache entries if upcalls are not serviced
 1223  * Call from the Slow Timeout mechanism, every half second.
 1224  */
 1225 static void
 1226 expire_upcalls(unused)
 1227         void *unused;
 1228 {
 1229         struct rtdetq *rte;
 1230         struct mf6c *mfc, **nptr;
 1231         int i;
 1232         int s;
 1233 
 1234         s = splnet();
 1235         for (i = 0; i < MF6CTBLSIZ; i++) {
 1236                 if (n6expire[i] == 0)
 1237                         continue;
 1238                 nptr = &mf6ctable[i];
 1239                 while ((mfc = *nptr) != NULL) {
 1240                         rte = mfc->mf6c_stall;
 1241                         /*
 1242                          * Skip real cache entries
 1243                          * Make sure it wasn't marked to not expire (shouldn't happen)
 1244                          * If it expires now
 1245                          */
 1246                         if (rte != NULL &&
 1247                             mfc->mf6c_expire != 0 &&
 1248                             --mfc->mf6c_expire == 0) {
 1249 #ifdef MRT6DEBUG
 1250                                 if (mrt6debug & DEBUG_EXPIRE)
 1251                                         log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
 1252                                             ip6_sprintf(&mfc->mf6c_origin.sin6_addr),
 1253                                             ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr));
 1254 #endif
 1255                                 /*
 1256                                  * drop all the packets
 1257                                  * free the mbuf with the pkt, if, timing info
 1258                                  */
 1259                                 do {
 1260                                         struct rtdetq *n = rte->next;
 1261                                         m_freem(rte->m);
 1262                                         free(rte, M_MRTABLE);
 1263                                         rte = n;
 1264                                 } while (rte != NULL);
 1265                                 mrt6stat.mrt6s_cache_cleanups++;
 1266                                 n6expire[i]--;
 1267 
 1268                                 *nptr = mfc->mf6c_next;
 1269                                 free(mfc, M_MRTABLE);
 1270                         } else {
 1271                                 nptr = &mfc->mf6c_next;
 1272                         }
 1273                 }
 1274         }
 1275         splx(s);
 1276         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
 1277             expire_upcalls, NULL);
 1278 }
 1279 
 1280 /*
 1281  * Packet forwarding routine once entry in the cache is made
 1282  */
 1283 static int
 1284 ip6_mdq(m, ifp, rt)
 1285         struct mbuf *m;
 1286         struct ifnet *ifp;
 1287         struct mf6c *rt;
 1288 {
 1289         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1290         mifi_t mifi, iif;
 1291         struct mif6 *mifp;
 1292         int plen = m->m_pkthdr.len;
 1293         u_int32_t dscopein, sscopein;
 1294 
 1295 /*
 1296  * Macro to send packet on mif.  Since RSVP packets don't get counted on
 1297  * input, they shouldn't get counted on output, so statistics keeping is
 1298  * separate.
 1299  */
 1300 
 1301 #define MC6_SEND(ip6, mifp, m) do {                             \
 1302         if ((mifp)->m6_flags & MIFF_REGISTER)                   \
 1303                 register_send((ip6), (mifp), (m));              \
 1304         else                                                    \
 1305                 phyint_send((ip6), (mifp), (m));                \
 1306 } while (/*CONSTCOND*/ 0)
 1307 
 1308         /*
 1309          * Don't forward if it didn't arrive from the parent mif
 1310          * for its origin.
 1311          */
 1312         mifi = rt->mf6c_parent;
 1313         if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
 1314                 /* came in the wrong interface */
 1315 #ifdef MRT6DEBUG
 1316                 if (mrt6debug & DEBUG_FORWARD)
 1317                         log(LOG_DEBUG,
 1318                             "wrong if: ifid %d mifi %d mififid %x\n",
 1319                             ifp->if_index, mifi,
 1320                             mif6table[mifi].m6_ifp->if_index);
 1321 #endif
 1322                 mrt6stat.mrt6s_wrong_if++;
 1323                 rt->mf6c_wrong_if++;
 1324                 /*
 1325                  * If we are doing PIM processing, and we are forwarding
 1326                  * packets on this interface, send a message to the
 1327                  * routing daemon.
 1328                  */
 1329                 /* have to make sure this is a valid mif */
 1330                 if (mifi < nummifs && mif6table[mifi].m6_ifp)
 1331                         if (pim6 && (m->m_flags & M_LOOP) == 0) {
 1332                                 /*
 1333                                  * Check the M_LOOP flag to avoid an
 1334                                  * unnecessary PIM assert.
 1335                                  * XXX: M_LOOP is an ad-hoc hack...
 1336                                  */
 1337                                 static struct sockaddr_in6 sin6 =
 1338                                 { sizeof(sin6), AF_INET6 };
 1339 
 1340                                 struct mbuf *mm;
 1341                                 struct mrt6msg *im;
 1342 #ifdef MRT6_OINIT
 1343                                 struct omrt6msg *oim;
 1344 #endif
 1345 
 1346                                 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
 1347                                 if (mm &&
 1348                                     (M_HASCL(mm) ||
 1349                                      mm->m_len < sizeof(struct ip6_hdr)))
 1350                                         mm = m_pullup(mm, sizeof(struct ip6_hdr));
 1351                                 if (mm == NULL)
 1352                                         return (ENOBUFS);
 1353 
 1354 #ifdef MRT6_OINIT
 1355                                 oim = NULL;
 1356 #endif
 1357                                 im = NULL;
 1358                                 switch (ip6_mrouter_ver) {
 1359 #ifdef MRT6_OINIT
 1360                                 case MRT6_OINIT:
 1361                                         oim = mtod(mm, struct omrt6msg *);
 1362                                         oim->im6_msgtype = MRT6MSG_WRONGMIF;
 1363                                         oim->im6_mbz = 0;
 1364                                         break;
 1365 #endif
 1366                                 case MRT6_INIT:
 1367                                         im = mtod(mm, struct mrt6msg *);
 1368                                         im->im6_msgtype = MRT6MSG_WRONGMIF;
 1369                                         im->im6_mbz = 0;
 1370                                         break;
 1371                                 default:
 1372                                         m_freem(mm);
 1373                                         return (EINVAL);
 1374                                 }
 1375 
 1376                                 for (mifp = mif6table, iif = 0;
 1377                                      iif < nummifs && mifp &&
 1378                                              mifp->m6_ifp != ifp;
 1379                                      mifp++, iif++)
 1380                                         ;
 1381 
 1382                                 switch (ip6_mrouter_ver) {
 1383 #ifdef MRT6_OINIT
 1384                                 case MRT6_OINIT:
 1385                                         oim->im6_mif = iif;
 1386                                         sin6.sin6_addr = oim->im6_src;
 1387                                         break;
 1388 #endif
 1389                                 case MRT6_INIT:
 1390                                         im->im6_mif = iif;
 1391                                         sin6.sin6_addr = im->im6_src;
 1392                                         break;
 1393                                 }
 1394 
 1395                                 mrt6stat.mrt6s_upcalls++;
 1396 
 1397                                 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1398 #ifdef MRT6DEBUG
 1399                                         if (mrt6debug)
 1400                                                 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
 1401 #endif
 1402                                         ++mrt6stat.mrt6s_upq_sockfull;
 1403                                         return (ENOBUFS);
 1404                                 }       /* if socket Q full */
 1405                         }               /* if PIM */
 1406                 return (0);
 1407         }                       /* if wrong iif */
 1408 
 1409         /* If I sourced this packet, it counts as output, else it was input. */
 1410         if (m->m_pkthdr.rcvif == NULL) {
 1411                 /* XXX: is rcvif really NULL when output?? */
 1412                 mif6table[mifi].m6_pkt_out++;
 1413                 mif6table[mifi].m6_bytes_out += plen;
 1414         } else {
 1415                 mif6table[mifi].m6_pkt_in++;
 1416                 mif6table[mifi].m6_bytes_in += plen;
 1417         }
 1418         rt->mf6c_pkt_cnt++;
 1419         rt->mf6c_byte_cnt += plen;
 1420 
 1421         /*
 1422          * For each mif, forward a copy of the packet if there are group
 1423          * members downstream on the interface.
 1424          */
 1425         if (in6_addr2zoneid(ifp, &ip6->ip6_dst, &dscopein) ||
 1426             in6_addr2zoneid(ifp, &ip6->ip6_src, &sscopein))
 1427                 return (EINVAL);
 1428         for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
 1429                 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
 1430                         u_int32_t dscopeout, sscopeout;
 1431 
 1432                         /*
 1433                          * check if the outgoing packet is going to break
 1434                          * a scope boundary.
 1435                          * XXX For packets through PIM register tunnel
 1436                          * interface, we believe a routing daemon.
 1437                          */
 1438                         if (!(mif6table[rt->mf6c_parent].m6_flags &
 1439                               MIFF_REGISTER) &&
 1440                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
 1441                                 if (in6_addr2zoneid(mif6table[mifi].m6_ifp,
 1442                                                     &ip6->ip6_dst,
 1443                                                     &dscopeout) ||
 1444                                     in6_addr2zoneid(mif6table[mifi].m6_ifp,
 1445                                                     &ip6->ip6_src,
 1446                                                     &sscopeout) ||
 1447                                     dscopein != dscopeout ||
 1448                                     sscopein != sscopeout) {
 1449                                         ip6stat.ip6s_badscope++;
 1450                                         continue;
 1451                                 }
 1452                         }
 1453 
 1454                         mifp->m6_pkt_out++;
 1455                         mifp->m6_bytes_out += plen;
 1456                         MC6_SEND(ip6, mifp, m);
 1457                 }
 1458         }
 1459         return (0);
 1460 }
 1461 
 1462 static void
 1463 phyint_send(ip6, mifp, m)
 1464     struct ip6_hdr *ip6;
 1465     struct mif6 *mifp;
 1466     struct mbuf *m;
 1467 {
 1468         struct mbuf *mb_copy;
 1469         struct ifnet *ifp = mifp->m6_ifp;
 1470         int error = 0;
 1471         int s = splnet();       /* needs to protect static "ro" below. */
 1472         static struct route_in6 ro;
 1473         struct  in6_multi *in6m;
 1474         struct sockaddr_in6 *dst6;
 1475         u_long linkmtu;
 1476 
 1477         /*
 1478          * Make a new reference to the packet; make sure that
 1479          * the IPv6 header is actually copied, not just referenced,
 1480          * so that ip6_output() only scribbles on the copy.
 1481          */
 1482         mb_copy = m_copy(m, 0, M_COPYALL);
 1483         if (mb_copy &&
 1484             (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
 1485                 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
 1486         if (mb_copy == NULL) {
 1487                 splx(s);
 1488                 return;
 1489         }
 1490         /* set MCAST flag to the outgoing packet */
 1491         mb_copy->m_flags |= M_MCAST;
 1492 
 1493         /*
 1494          * If we sourced the packet, call ip6_output since we may devide
 1495          * the packet into fragments when the packet is too big for the
 1496          * outgoing interface.
 1497          * Otherwise, we can simply send the packet to the interface
 1498          * sending queue.
 1499          */
 1500         if (m->m_pkthdr.rcvif == NULL) {
 1501                 struct ip6_moptions im6o;
 1502 
 1503                 im6o.im6o_multicast_ifp = ifp;
 1504                 /* XXX: ip6_output will override ip6->ip6_hlim */
 1505                 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
 1506                 im6o.im6o_multicast_loop = 1;
 1507                 error = ip6_output(mb_copy, NULL, &ro,
 1508                                    IPV6_FORWARDING, &im6o, NULL, NULL);
 1509 
 1510 #ifdef MRT6DEBUG
 1511                 if (mrt6debug & DEBUG_XMIT)
 1512                         log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
 1513                             mifp - mif6table, error);
 1514 #endif
 1515                 splx(s);
 1516                 return;
 1517         }
 1518 
 1519         /*
 1520          * If we belong to the destination multicast group
 1521          * on the outgoing interface, loop back a copy.
 1522          */
 1523         dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
 1524         IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
 1525         if (in6m != NULL) {
 1526                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1527                 dst6->sin6_family = AF_INET6;
 1528                 dst6->sin6_addr = ip6->ip6_dst;
 1529                 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
 1530         }
 1531         /*
 1532          * Put the packet into the sending queue of the outgoing interface
 1533          * if it would fit in the MTU of the interface.
 1534          */
 1535         linkmtu = IN6_LINKMTU(ifp);
 1536         if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
 1537                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1538                 dst6->sin6_family = AF_INET6;
 1539                 dst6->sin6_addr = ip6->ip6_dst;
 1540                 /*
 1541                  * We just call if_output instead of nd6_output here, since
 1542                  * we need no ND for a multicast forwarded packet...right?
 1543                  */
 1544                 error = (*ifp->if_output)(ifp, mb_copy,
 1545                     (struct sockaddr *)&ro.ro_dst, NULL);
 1546 #ifdef MRT6DEBUG
 1547                 if (mrt6debug & DEBUG_XMIT)
 1548                         log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
 1549                             mifp - mif6table, error);
 1550 #endif
 1551         } else {
 1552 #ifdef MULTICAST_PMTUD
 1553                 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
 1554 #else
 1555 #ifdef MRT6DEBUG
 1556                 if (mrt6debug & DEBUG_XMIT)
 1557                         log(LOG_DEBUG,
 1558                             "phyint_send: packet too big on %s o %s g %s"
 1559                             " size %d(discarded)\n",
 1560                             if_name(ifp),
 1561                             ip6_sprintf(&ip6->ip6_src),
 1562                             ip6_sprintf(&ip6->ip6_dst),
 1563                             mb_copy->m_pkthdr.len);
 1564 #endif /* MRT6DEBUG */
 1565                 m_freem(mb_copy); /* simply discard the packet */
 1566 #endif
 1567         }
 1568 
 1569         splx(s);
 1570 }
 1571 
 1572 static int
 1573 register_send(ip6, mif, m)
 1574         struct ip6_hdr *ip6;
 1575         struct mif6 *mif;
 1576         struct mbuf *m;
 1577 {
 1578         struct mbuf *mm;
 1579         int i, len = m->m_pkthdr.len;
 1580         static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
 1581         struct mrt6msg *im6;
 1582 
 1583 #ifdef MRT6DEBUG
 1584         if (mrt6debug)
 1585                 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
 1586                     ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst));
 1587 #endif
 1588         ++pim6stat.pim6s_snd_registers;
 1589 
 1590         /* Make a copy of the packet to send to the user level process */
 1591         MGETHDR(mm, M_DONTWAIT, MT_HEADER);
 1592         if (mm == NULL)
 1593                 return (ENOBUFS);
 1594         mm->m_pkthdr.rcvif = NULL;
 1595         mm->m_data += max_linkhdr;
 1596         mm->m_len = sizeof(struct ip6_hdr);
 1597 
 1598         if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
 1599                 m_freem(mm);
 1600                 return (ENOBUFS);
 1601         }
 1602         i = MHLEN - M_LEADINGSPACE(mm);
 1603         if (i > len)
 1604                 i = len;
 1605         mm = m_pullup(mm, i);
 1606         if (mm == NULL)
 1607                 return (ENOBUFS);
 1608 /* TODO: check it! */
 1609         mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
 1610 
 1611         /*
 1612          * Send message to routing daemon
 1613          */
 1614         sin6.sin6_addr = ip6->ip6_src;
 1615 
 1616         im6 = mtod(mm, struct mrt6msg *);
 1617         im6->im6_msgtype      = MRT6MSG_WHOLEPKT;
 1618         im6->im6_mbz          = 0;
 1619 
 1620         im6->im6_mif = mif - mif6table;
 1621 
 1622         /* iif info is not given for reg. encap.n */
 1623         mrt6stat.mrt6s_upcalls++;
 1624 
 1625         if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1626 #ifdef MRT6DEBUG
 1627                 if (mrt6debug)
 1628                         log(LOG_WARNING,
 1629                             "register_send: ip6_mrouter socket queue full\n");
 1630 #endif
 1631                 ++mrt6stat.mrt6s_upq_sockfull;
 1632                 return (ENOBUFS);
 1633         }
 1634         return (0);
 1635 }
 1636 
 1637 /*
 1638  * PIM sparse mode hook
 1639  * Receives the pim control messages, and passes them up to the listening
 1640  * socket, using rip6_input.
 1641  * The only message processed is the REGISTER pim message; the pim header
 1642  * is stripped off, and the inner packet is passed to register_mforward.
 1643  */
 1644 int
 1645 pim6_input(mp, offp, proto)
 1646         struct mbuf **mp;
 1647         int *offp, proto;
 1648 {
 1649         struct pim *pim; /* pointer to a pim struct */
 1650         struct ip6_hdr *ip6;
 1651         int pimlen;
 1652         struct mbuf *m = *mp;
 1653         int minlen;
 1654         int off = *offp;
 1655 
 1656         ++pim6stat.pim6s_rcv_total;
 1657 
 1658         ip6 = mtod(m, struct ip6_hdr *);
 1659         pimlen = m->m_pkthdr.len - *offp;
 1660 
 1661         /*
 1662          * Validate lengths
 1663          */
 1664         if (pimlen < PIM_MINLEN) {
 1665                 ++pim6stat.pim6s_rcv_tooshort;
 1666 #ifdef MRT6DEBUG
 1667                 if (mrt6debug & DEBUG_PIM)
 1668                         log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
 1669 #endif
 1670                 m_freem(m);
 1671                 return (IPPROTO_DONE);
 1672         }
 1673 
 1674         /*
 1675          * if the packet is at least as big as a REGISTER, go ahead
 1676          * and grab the PIM REGISTER header size, to avoid another
 1677          * possible m_pullup() later.
 1678          *
 1679          * PIM_MINLEN       == pimhdr + u_int32 == 8
 1680          * PIM6_REG_MINLEN   == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
 1681          */
 1682         minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
 1683 
 1684         /*
 1685          * Make sure that the IP6 and PIM headers in contiguous memory, and
 1686          * possibly the PIM REGISTER header
 1687          */
 1688 #ifndef PULLDOWN_TEST
 1689         IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
 1690         /* adjust pointer */
 1691         ip6 = mtod(m, struct ip6_hdr *);
 1692 
 1693         /* adjust mbuf to point to the PIM header */
 1694         pim = (struct pim *)((caddr_t)ip6 + off);
 1695 #else
 1696         IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
 1697         if (pim == NULL) {
 1698                 pim6stat.pim6s_rcv_tooshort++;
 1699                 return (IPPROTO_DONE);
 1700         }
 1701 #endif
 1702 
 1703 #define PIM6_CHECKSUM
 1704 #ifdef PIM6_CHECKSUM
 1705         {
 1706                 int cksumlen;
 1707 
 1708                 /*
 1709                  * Validate checksum.
 1710                  * If PIM REGISTER, exclude the data packet
 1711                  */
 1712                 if (pim->pim_type == PIM_REGISTER)
 1713                         cksumlen = PIM_MINLEN;
 1714                 else
 1715                         cksumlen = pimlen;
 1716 
 1717                 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
 1718                         ++pim6stat.pim6s_rcv_badsum;
 1719 #ifdef MRT6DEBUG
 1720                         if (mrt6debug & DEBUG_PIM)
 1721                                 log(LOG_DEBUG,
 1722                                     "pim6_input: invalid checksum\n");
 1723 #endif
 1724                         m_freem(m);
 1725                         return (IPPROTO_DONE);
 1726                 }
 1727         }
 1728 #endif /* PIM_CHECKSUM */
 1729 
 1730         /* PIM version check */
 1731         if (pim->pim_ver != PIM_VERSION) {
 1732                 ++pim6stat.pim6s_rcv_badversion;
 1733 #ifdef MRT6DEBUG
 1734                 log(LOG_ERR,
 1735                     "pim6_input: incorrect version %d, expecting %d\n",
 1736                     pim->pim_ver, PIM_VERSION);
 1737 #endif
 1738                 m_freem(m);
 1739                 return (IPPROTO_DONE);
 1740         }
 1741 
 1742         if (pim->pim_type == PIM_REGISTER) {
 1743                 /*
 1744                  * since this is a REGISTER, we'll make a copy of the register
 1745                  * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
 1746                  * routing daemon.
 1747                  */
 1748                 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
 1749 
 1750                 struct mbuf *mcp;
 1751                 struct ip6_hdr *eip6;
 1752                 u_int32_t *reghdr;
 1753                 int rc;
 1754 
 1755                 ++pim6stat.pim6s_rcv_registers;
 1756 
 1757                 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
 1758 #ifdef MRT6DEBUG
 1759                         if (mrt6debug & DEBUG_PIM)
 1760                                 log(LOG_DEBUG,
 1761                                     "pim6_input: register mif not set: %d\n",
 1762                                     reg_mif_num);
 1763 #endif
 1764                         m_freem(m);
 1765                         return (IPPROTO_DONE);
 1766                 }
 1767 
 1768                 reghdr = (u_int32_t *)(pim + 1);
 1769 
 1770                 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
 1771                         goto pim6_input_to_daemon;
 1772 
 1773                 /*
 1774                  * Validate length
 1775                  */
 1776                 if (pimlen < PIM6_REG_MINLEN) {
 1777                         ++pim6stat.pim6s_rcv_tooshort;
 1778                         ++pim6stat.pim6s_rcv_badregisters;
 1779 #ifdef MRT6DEBUG
 1780                         log(LOG_ERR,
 1781                             "pim6_input: register packet size too "
 1782                             "small %d from %s\n",
 1783                             pimlen, ip6_sprintf(&ip6->ip6_src));
 1784 #endif
 1785                         m_freem(m);
 1786                         return (IPPROTO_DONE);
 1787                 }
 1788 
 1789                 eip6 = (struct ip6_hdr *) (reghdr + 1);
 1790 #ifdef MRT6DEBUG
 1791                 if (mrt6debug & DEBUG_PIM)
 1792                         log(LOG_DEBUG,
 1793                             "pim6_input[register], eip6: %s -> %s, "
 1794                             "eip6 plen %d\n",
 1795                             ip6_sprintf(&eip6->ip6_src),
 1796                             ip6_sprintf(&eip6->ip6_dst),
 1797                             ntohs(eip6->ip6_plen));
 1798 #endif
 1799 
 1800                 /* verify the version number of the inner packet */
 1801                 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
 1802                         ++pim6stat.pim6s_rcv_badregisters;
 1803 #ifdef MRT6DEBUG
 1804                         log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
 1805                             "of the inner packet\n",
 1806                             (eip6->ip6_vfc & IPV6_VERSION));
 1807 #endif
 1808                         m_freem(m);
 1809                         return (IPPROTO_NONE);
 1810                 }
 1811 
 1812                 /* verify the inner packet is destined to a mcast group */
 1813                 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
 1814                         ++pim6stat.pim6s_rcv_badregisters;
 1815 #ifdef MRT6DEBUG
 1816                         if (mrt6debug & DEBUG_PIM)
 1817                                 log(LOG_DEBUG,
 1818                                     "pim6_input: inner packet of register "
 1819                                     "is not multicast %s\n",
 1820                                     ip6_sprintf(&eip6->ip6_dst));
 1821 #endif
 1822                         m_freem(m);
 1823                         return (IPPROTO_DONE);
 1824                 }
 1825 
 1826                 /*
 1827                  * make a copy of the whole header to pass to the daemon later.
 1828                  */
 1829                 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
 1830                 if (mcp == NULL) {
 1831 #ifdef MRT6DEBUG
 1832                         log(LOG_ERR,
 1833                             "pim6_input: pim register: "
 1834                             "could not copy register head\n");
 1835 #endif
 1836                         m_freem(m);
 1837                         return (IPPROTO_DONE);
 1838                 }
 1839 
 1840                 /*
 1841                  * forward the inner ip6 packet; point m_data at the inner ip6.
 1842                  */
 1843                 m_adj(m, off + PIM_MINLEN);
 1844 #ifdef MRT6DEBUG
 1845                 if (mrt6debug & DEBUG_PIM) {
 1846                         log(LOG_DEBUG,
 1847                             "pim6_input: forwarding decapsulated register: "
 1848                             "src %s, dst %s, mif %d\n",
 1849                             ip6_sprintf(&eip6->ip6_src),
 1850                             ip6_sprintf(&eip6->ip6_dst),
 1851                             reg_mif_num);
 1852                 }
 1853 #endif
 1854 
 1855                 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
 1856                                 dst.sin6_family, 0);
 1857 
 1858                 /* prepare the register head to send to the mrouting daemon */
 1859                 m = mcp;
 1860         }
 1861 
 1862         /*
 1863          * Pass the PIM message up to the daemon; if it is a register message
 1864          * pass the 'head' only up to the daemon. This includes the
 1865          * encapsulator ip6 header, pim header, register header and the
 1866          * encapsulated ip6 header.
 1867          */
 1868   pim6_input_to_daemon:
 1869         rip6_input(&m, offp, proto);
 1870         return (IPPROTO_DONE);
 1871 }

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