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: src/sys/netinet6/ip6_mroute.c,v 1.28.2.3 2006/04/20 15:16:03 suz Exp $        */
    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_if6;
  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 mf6c *rt;
  481         struct rtdetq *rte;
  482         int s;
  483 
  484         s = splnet();
  485 
  486         /*
  487          * For each phyint in use, disable promiscuous reception of all IPv6
  488          * multicasts.
  489          */
  490 #ifdef INET
  491 #ifdef MROUTING
  492         /*
  493          * If there is still IPv4 multicast routing daemon,
  494          * we remain interfaces to receive all muliticasted packets.
  495          * XXX: there may be an interface in which the IPv4 multicast
  496          * daemon is not interested...
  497          */
  498         if (!ip_mrouter)
  499 #endif
  500 #endif
  501         {
  502                 for (mifi = 0; mifi < nummifs; mifi++) {
  503                         if (mif6table[mifi].m6_ifp &&
  504                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
  505                                 if_allmulti(mif6table[mifi].m6_ifp, 0);
  506                         }
  507                 }
  508         }
  509 #ifdef notyet
  510         bzero((caddr_t)qtable, sizeof(qtable));
  511         bzero((caddr_t)tbftable, sizeof(tbftable));
  512 #endif
  513         bzero((caddr_t)mif6table, sizeof(mif6table));
  514         nummifs = 0;
  515 
  516         pim6 = 0; /* used to stub out/in pim specific code */
  517 
  518         callout_stop(&expire_upcalls_ch);
  519 
  520         /*
  521          * Free all multicast forwarding cache entries.
  522          */
  523         for (i = 0; i < MF6CTBLSIZ; i++) {
  524                 rt = mf6ctable[i];
  525                 while (rt) {
  526                         struct mf6c *frt;
  527 
  528                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  529                                 struct rtdetq *n = rte->next;
  530 
  531                                 m_free(rte->m);
  532                                 free(rte, M_MRTABLE);
  533                                 rte = n;
  534                         }
  535                         frt = rt;
  536                         rt = rt->mf6c_next;
  537                         free(frt, M_MRTABLE);
  538                 }
  539         }
  540 
  541         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  542 
  543         /*
  544          * Reset register interface
  545          */
  546         if (reg_mif_num != (mifi_t)-1) {
  547                 if_detach(&multicast_register_if6);
  548                 reg_mif_num = (mifi_t)-1;
  549         }
  550 
  551         ip6_mrouter = NULL;
  552         ip6_mrouter_ver = 0;
  553 
  554         splx(s);
  555 
  556 #ifdef MRT6DEBUG
  557         if (mrt6debug)
  558                 log(LOG_DEBUG, "ip6_mrouter_done\n");
  559 #endif
  560 
  561         return (0);
  562 }
  563 
  564 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
  565 
  566 /*
  567  * Add a mif to the mif table
  568  */
  569 static int
  570 add_m6if(mifcp)
  571         struct mif6ctl *mifcp;
  572 {
  573         struct mif6 *mifp;
  574         struct ifnet *ifp;
  575         int error, s;
  576 #ifdef notyet
  577         struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi;
  578 #endif
  579 
  580         if (mifcp->mif6c_mifi >= MAXMIFS)
  581                 return (EINVAL);
  582         mifp = mif6table + mifcp->mif6c_mifi;
  583         if (mifp->m6_ifp)
  584                 return (EADDRINUSE); /* XXX: is it appropriate? */
  585         if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
  586                 return (ENXIO);
  587         ifp = ifnet_byindex(mifcp->mif6c_pifi);
  588 
  589         if (mifcp->mif6c_flags & MIFF_REGISTER) {
  590                 ifp = &multicast_register_if6;
  591 
  592                 if (reg_mif_num == (mifi_t)-1) {
  593                         if_initname(ifp, "register_mif", 0);
  594                         ifp->if_flags |= IFF_LOOPBACK;
  595                         ifp->if_index = mifcp->mif6c_mifi;
  596                         reg_mif_num = mifcp->mif6c_mifi;
  597                         if_attach(ifp);
  598                 }
  599 
  600         } /* if REGISTER */
  601         else {
  602                 /* Make sure the interface supports multicast */
  603                 if ((ifp->if_flags & IFF_MULTICAST) == 0)
  604                         return (EOPNOTSUPP);
  605 
  606                 s = splnet();
  607                 error = if_allmulti(ifp, 1);
  608                 splx(s);
  609                 if (error)
  610                         return (error);
  611         }
  612 
  613         s = splnet();
  614         mifp->m6_flags     = mifcp->mif6c_flags;
  615         mifp->m6_ifp       = ifp;
  616 #ifdef notyet
  617         /* scaling up here allows division by 1024 in critical code */
  618         mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000;
  619 #endif
  620         /* initialize per mif pkt counters */
  621         mifp->m6_pkt_in    = 0;
  622         mifp->m6_pkt_out   = 0;
  623         mifp->m6_bytes_in  = 0;
  624         mifp->m6_bytes_out = 0;
  625         splx(s);
  626 
  627         /* Adjust nummifs up if the mifi is higher than nummifs */
  628         if (nummifs <= mifcp->mif6c_mifi)
  629                 nummifs = mifcp->mif6c_mifi + 1;
  630 
  631 #ifdef MRT6DEBUG
  632         if (mrt6debug)
  633                 log(LOG_DEBUG,
  634                     "add_mif #%d, phyint %s\n",
  635                     mifcp->mif6c_mifi,
  636                     ifp->if_xname);
  637 #endif
  638 
  639         return (0);
  640 }
  641 
  642 /*
  643  * Delete a mif from the mif table
  644  */
  645 static int
  646 del_m6if(mifip)
  647         mifi_t *mifip;
  648 {
  649         struct mif6 *mifp = mif6table + *mifip;
  650         mifi_t mifi;
  651         struct ifnet *ifp;
  652         int s;
  653 
  654         if (*mifip >= nummifs)
  655                 return (EINVAL);
  656         if (mifp->m6_ifp == NULL)
  657                 return (EINVAL);
  658 
  659         s = splnet();
  660 
  661         if (!(mifp->m6_flags & MIFF_REGISTER)) {
  662                 /*
  663                  * XXX: what if there is yet IPv4 multicast daemon
  664                  *      using the interface?
  665                  */
  666                 ifp = mifp->m6_ifp;
  667 
  668                 if_allmulti(ifp, 0);
  669         } else {
  670                 if (reg_mif_num != (mifi_t)-1) {
  671                         if_detach(&multicast_register_if6);
  672                         reg_mif_num = (mifi_t)-1;
  673                 }
  674         }
  675 
  676 #ifdef notyet
  677         bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip]));
  678         bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf)));
  679 #endif
  680         bzero((caddr_t)mifp, sizeof(*mifp));
  681 
  682         /* Adjust nummifs down */
  683         for (mifi = nummifs; mifi > 0; mifi--)
  684                 if (mif6table[mifi - 1].m6_ifp)
  685                         break;
  686         nummifs = mifi;
  687 
  688         splx(s);
  689 
  690 #ifdef MRT6DEBUG
  691         if (mrt6debug)
  692                 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
  693 #endif
  694 
  695         return (0);
  696 }
  697 
  698 /*
  699  * Add an mfc entry
  700  */
  701 static int
  702 add_m6fc(mfccp)
  703         struct mf6cctl *mfccp;
  704 {
  705         struct mf6c *rt;
  706         u_long hash;
  707         struct rtdetq *rte;
  708         u_short nstl;
  709         int s;
  710 
  711         MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
  712                  mfccp->mf6cc_mcastgrp.sin6_addr, rt);
  713 
  714         /* If an entry already exists, just update the fields */
  715         if (rt) {
  716 #ifdef MRT6DEBUG
  717                 if (mrt6debug & DEBUG_MFC)
  718                         log(LOG_DEBUG,
  719                             "add_m6fc no upcall h %d o %s g %s p %x\n",
  720                             ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
  721                             ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
  722                             mfccp->mf6cc_parent);
  723 #endif
  724 
  725                 s = splnet();
  726                 rt->mf6c_parent = mfccp->mf6cc_parent;
  727                 rt->mf6c_ifset = mfccp->mf6cc_ifset;
  728                 splx(s);
  729                 return (0);
  730         }
  731 
  732         /*
  733          * Find the entry for which the upcall was made and update
  734          */
  735         s = splnet();
  736         hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
  737                         mfccp->mf6cc_mcastgrp.sin6_addr);
  738         for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
  739                 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  740                                        &mfccp->mf6cc_origin.sin6_addr) &&
  741                     IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  742                                        &mfccp->mf6cc_mcastgrp.sin6_addr) &&
  743                     (rt->mf6c_stall != NULL)) {
  744 
  745                         if (nstl++)
  746                                 log(LOG_ERR,
  747                                     "add_m6fc: %s o %s g %s p %x dbx %p\n",
  748                                     "multiple kernel entries",
  749                                     ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
  750                                     ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
  751                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  752 
  753 #ifdef MRT6DEBUG
  754                         if (mrt6debug & DEBUG_MFC)
  755                                 log(LOG_DEBUG,
  756                                     "add_m6fc o %s g %s p %x dbg %x\n",
  757                                     ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
  758                                     ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
  759                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  760 #endif
  761 
  762                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  763                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  764                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  765                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  766                         /* initialize pkt counters per src-grp */
  767                         rt->mf6c_pkt_cnt    = 0;
  768                         rt->mf6c_byte_cnt   = 0;
  769                         rt->mf6c_wrong_if   = 0;
  770 
  771                         rt->mf6c_expire = 0;    /* Don't clean this guy up */
  772                         n6expire[hash]--;
  773 
  774                         /* free packets Qed at the end of this entry */
  775                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  776                                 struct rtdetq *n = rte->next;
  777                                 ip6_mdq(rte->m, rte->ifp, rt);
  778                                 m_freem(rte->m);
  779 #ifdef UPCALL_TIMING
  780                                 collate(&(rte->t));
  781 #endif /* UPCALL_TIMING */
  782                                 free(rte, M_MRTABLE);
  783                                 rte = n;
  784                         }
  785                         rt->mf6c_stall = NULL;
  786                 }
  787         }
  788 
  789         /*
  790          * It is possible that an entry is being inserted without an upcall
  791          */
  792         if (nstl == 0) {
  793 #ifdef MRT6DEBUG
  794                 if (mrt6debug & DEBUG_MFC)
  795                         log(LOG_DEBUG,
  796                             "add_mfc no upcall h %d o %s g %s p %x\n",
  797                             hash,
  798                             ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
  799                             ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
  800                             mfccp->mf6cc_parent);
  801 #endif
  802 
  803                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
  804 
  805                         if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  806                                                &mfccp->mf6cc_origin.sin6_addr)&&
  807                             IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  808                                                &mfccp->mf6cc_mcastgrp.sin6_addr)) {
  809 
  810                                 rt->mf6c_origin     = mfccp->mf6cc_origin;
  811                                 rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  812                                 rt->mf6c_parent     = mfccp->mf6cc_parent;
  813                                 rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  814                                 /* initialize pkt counters per src-grp */
  815                                 rt->mf6c_pkt_cnt    = 0;
  816                                 rt->mf6c_byte_cnt   = 0;
  817                                 rt->mf6c_wrong_if   = 0;
  818 
  819                                 if (rt->mf6c_expire)
  820                                         n6expire[hash]--;
  821                                 rt->mf6c_expire    = 0;
  822                         }
  823                 }
  824                 if (rt == NULL) {
  825                         /* no upcall, so make a new entry */
  826                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE,
  827                                                   M_NOWAIT);
  828                         if (rt == NULL) {
  829                                 splx(s);
  830                                 return (ENOBUFS);
  831                         }
  832 
  833                         /* insert new entry at head of hash chain */
  834                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  835                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  836                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  837                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  838                         /* initialize pkt counters per src-grp */
  839                         rt->mf6c_pkt_cnt    = 0;
  840                         rt->mf6c_byte_cnt   = 0;
  841                         rt->mf6c_wrong_if   = 0;
  842                         rt->mf6c_expire     = 0;
  843                         rt->mf6c_stall = NULL;
  844 
  845                         /* link into table */
  846                         rt->mf6c_next  = mf6ctable[hash];
  847                         mf6ctable[hash] = rt;
  848                 }
  849         }
  850         splx(s);
  851         return (0);
  852 }
  853 
  854 #ifdef UPCALL_TIMING
  855 /*
  856  * collect delay statistics on the upcalls
  857  */
  858 static void
  859 collate(t)
  860         struct timeval *t;
  861 {
  862         u_long d;
  863         struct timeval tp;
  864         u_long delta;
  865 
  866         GET_TIME(tp);
  867 
  868         if (TV_LT(*t, tp))
  869         {
  870                 TV_DELTA(tp, *t, delta);
  871 
  872                 d = delta >> 10;
  873                 if (d > UPCALL_MAX)
  874                         d = UPCALL_MAX;
  875 
  876                 ++upcall_data[d];
  877         }
  878 }
  879 #endif /* UPCALL_TIMING */
  880 
  881 /*
  882  * Delete an mfc entry
  883  */
  884 static int
  885 del_m6fc(mfccp)
  886         struct mf6cctl *mfccp;
  887 {
  888         struct sockaddr_in6     origin;
  889         struct sockaddr_in6     mcastgrp;
  890         struct mf6c             *rt;
  891         struct mf6c             **nptr;
  892         u_long          hash;
  893         int s;
  894 
  895         origin = mfccp->mf6cc_origin;
  896         mcastgrp = mfccp->mf6cc_mcastgrp;
  897         hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
  898 
  899 #ifdef MRT6DEBUG
  900         if (mrt6debug & DEBUG_MFC)
  901                 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
  902                     ip6_sprintf(&origin.sin6_addr),
  903                     ip6_sprintf(&mcastgrp.sin6_addr));
  904 #endif
  905 
  906         s = splnet();
  907 
  908         nptr = &mf6ctable[hash];
  909         while ((rt = *nptr) != NULL) {
  910                 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
  911                                        &rt->mf6c_origin.sin6_addr) &&
  912                     IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
  913                                        &rt->mf6c_mcastgrp.sin6_addr) &&
  914                     rt->mf6c_stall == NULL)
  915                         break;
  916 
  917                 nptr = &rt->mf6c_next;
  918         }
  919         if (rt == NULL) {
  920                 splx(s);
  921                 return (EADDRNOTAVAIL);
  922         }
  923 
  924         *nptr = rt->mf6c_next;
  925         free(rt, M_MRTABLE);
  926 
  927         splx(s);
  928 
  929         return (0);
  930 }
  931 
  932 static int
  933 socket_send(s, mm, src)
  934         struct socket *s;
  935         struct mbuf *mm;
  936         struct sockaddr_in6 *src;
  937 {
  938         if (s) {
  939                 if (sbappendaddr(&s->so_rcv,
  940                                  (struct sockaddr *)src,
  941                                  mm, (struct mbuf *)0) != 0) {
  942                         sorwakeup(s);
  943                         return (0);
  944                 }
  945         }
  946         m_freem(mm);
  947         return (-1);
  948 }
  949 
  950 /*
  951  * IPv6 multicast forwarding function. This function assumes that the packet
  952  * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
  953  * pointed to by "ifp", and the packet is to be relayed to other networks
  954  * that have members of the packet's destination IPv6 multicast group.
  955  *
  956  * The packet is returned unscathed to the caller, unless it is
  957  * erroneous, in which case a non-zero return value tells the caller to
  958  * discard it.
  959  */
  960 
  961 int
  962 ip6_mforward(ip6, ifp, m)
  963         struct ip6_hdr *ip6;
  964         struct ifnet *ifp;
  965         struct mbuf *m;
  966 {
  967         struct mf6c *rt;
  968         struct mif6 *mifp;
  969         struct mbuf *mm;
  970         int s;
  971         mifi_t mifi;
  972 
  973 #ifdef MRT6DEBUG
  974         if (mrt6debug & DEBUG_FORWARD)
  975                 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
  976                     ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst),
  977                     ifp->if_index);
  978 #endif
  979 
  980         /*
  981          * Don't forward a packet with Hop limit of zero or one,
  982          * or a packet destined to a local-only group.
  983          */
  984         if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
  985             IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
  986                 return (0);
  987         ip6->ip6_hlim--;
  988 
  989         /*
  990          * Source address check: do not forward packets with unspecified
  991          * source. It was discussed in July 2000, on ipngwg mailing list.
  992          * This is rather more serious than unicast cases, because some
  993          * MLD packets can be sent with the unspecified source address
  994          * (although such packets must normally set 1 to the hop limit field).
  995          */
  996         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
  997                 ip6stat.ip6s_cantforward++;
  998                 if (ip6_log_time + ip6_log_interval < time_second) {
  999                         ip6_log_time = time_second;
 1000                         log(LOG_DEBUG,
 1001                             "cannot forward "
 1002                             "from %s to %s nxt %d received on %s\n",
 1003                             ip6_sprintf(&ip6->ip6_src),
 1004                             ip6_sprintf(&ip6->ip6_dst),
 1005                             ip6->ip6_nxt,
 1006                             if_name(m->m_pkthdr.rcvif));
 1007                 }
 1008                 return (0);
 1009         }
 1010 
 1011         /*
 1012          * Determine forwarding mifs from the forwarding cache table
 1013          */
 1014         s = splnet();
 1015         MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
 1016 
 1017         /* Entry exists, so forward if necessary */
 1018         if (rt) {
 1019                 splx(s);
 1020                 return (ip6_mdq(m, ifp, rt));
 1021         } else {
 1022                 /*
 1023                  * If we don't have a route for packet's origin,
 1024                  * Make a copy of the packet &
 1025                  * send message to routing daemon
 1026                  */
 1027 
 1028                 struct mbuf *mb0;
 1029                 struct rtdetq *rte;
 1030                 u_long hash;
 1031 /*              int i, npkts;*/
 1032 #ifdef UPCALL_TIMING
 1033                 struct timeval tp;
 1034 
 1035                 GET_TIME(tp);
 1036 #endif /* UPCALL_TIMING */
 1037 
 1038                 mrt6stat.mrt6s_no_route++;
 1039 #ifdef MRT6DEBUG
 1040                 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
 1041                         log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
 1042                             ip6_sprintf(&ip6->ip6_src),
 1043                             ip6_sprintf(&ip6->ip6_dst));
 1044 #endif
 1045 
 1046                 /*
 1047                  * Allocate mbufs early so that we don't do extra work if we
 1048                  * are just going to fail anyway.
 1049                  */
 1050                 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE,
 1051                                               M_NOWAIT);
 1052                 if (rte == NULL) {
 1053                         splx(s);
 1054                         return (ENOBUFS);
 1055                 }
 1056                 mb0 = m_copy(m, 0, M_COPYALL);
 1057                 /*
 1058                  * Pullup packet header if needed before storing it,
 1059                  * as other references may modify it in the meantime.
 1060                  */
 1061                 if (mb0 &&
 1062                     (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
 1063                         mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
 1064                 if (mb0 == NULL) {
 1065                         free(rte, M_MRTABLE);
 1066                         splx(s);
 1067                         return (ENOBUFS);
 1068                 }
 1069 
 1070                 /* is there an upcall waiting for this packet? */
 1071                 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
 1072                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
 1073                         if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
 1074                                                &rt->mf6c_origin.sin6_addr) &&
 1075                             IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
 1076                                                &rt->mf6c_mcastgrp.sin6_addr) &&
 1077                             (rt->mf6c_stall != NULL))
 1078                                 break;
 1079                 }
 1080 
 1081                 if (rt == NULL) {
 1082                         struct mrt6msg *im;
 1083 #ifdef MRT6_OINIT
 1084                         struct omrt6msg *oim;
 1085 #endif
 1086 
 1087                         /* no upcall, so make a new entry */
 1088                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE,
 1089                                                   M_NOWAIT);
 1090                         if (rt == NULL) {
 1091                                 free(rte, M_MRTABLE);
 1092                                 m_freem(mb0);
 1093                                 splx(s);
 1094                                 return (ENOBUFS);
 1095                         }
 1096                         /*
 1097                          * Make a copy of the header to send to the user
 1098                          * level process
 1099                          */
 1100                         mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
 1101 
 1102                         if (mm == NULL) {
 1103                                 free(rte, M_MRTABLE);
 1104                                 m_freem(mb0);
 1105                                 free(rt, M_MRTABLE);
 1106                                 splx(s);
 1107                                 return (ENOBUFS);
 1108                         }
 1109 
 1110                         /*
 1111                          * Send message to routing daemon
 1112                          */
 1113                         sin6.sin6_addr = ip6->ip6_src;
 1114 
 1115                         im = NULL;
 1116 #ifdef MRT6_OINIT
 1117                         oim = NULL;
 1118 #endif
 1119                         switch (ip6_mrouter_ver) {
 1120 #ifdef MRT6_OINIT
 1121                         case MRT6_OINIT:
 1122                                 oim = mtod(mm, struct omrt6msg *);
 1123                                 oim->im6_msgtype = MRT6MSG_NOCACHE;
 1124                                 oim->im6_mbz = 0;
 1125                                 break;
 1126 #endif
 1127                         case MRT6_INIT:
 1128                                 im = mtod(mm, struct mrt6msg *);
 1129                                 im->im6_msgtype = MRT6MSG_NOCACHE;
 1130                                 im->im6_mbz = 0;
 1131                                 break;
 1132                         default:
 1133                                 free(rte, M_MRTABLE);
 1134                                 m_freem(mb0);
 1135                                 free(rt, M_MRTABLE);
 1136                                 splx(s);
 1137                                 return (EINVAL);
 1138                         }
 1139 
 1140 #ifdef MRT6DEBUG
 1141                         if (mrt6debug & DEBUG_FORWARD)
 1142                                 log(LOG_DEBUG,
 1143                                     "getting the iif info in the kernel\n");
 1144 #endif
 1145 
 1146                         for (mifp = mif6table, mifi = 0;
 1147                              mifi < nummifs && mifp->m6_ifp != ifp;
 1148                              mifp++, mifi++)
 1149                                 ;
 1150 
 1151                         switch (ip6_mrouter_ver) {
 1152 #ifdef MRT6_OINIT
 1153                         case MRT6_OINIT:
 1154                                 oim->im6_mif = mifi;
 1155                                 break;
 1156 #endif
 1157                         case MRT6_INIT:
 1158                                 im->im6_mif = mifi;
 1159                                 break;
 1160                         }
 1161 
 1162                         if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1163                                 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
 1164                                     "socket queue full\n");
 1165                                 mrt6stat.mrt6s_upq_sockfull++;
 1166                                 free(rte, M_MRTABLE);
 1167                                 m_freem(mb0);
 1168                                 free(rt, M_MRTABLE);
 1169                                 splx(s);
 1170                                 return (ENOBUFS);
 1171                         }
 1172 
 1173                         mrt6stat.mrt6s_upcalls++;
 1174 
 1175                         /* insert new entry at head of hash chain */
 1176                         bzero(rt, sizeof(*rt));
 1177                         rt->mf6c_origin.sin6_family = AF_INET6;
 1178                         rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
 1179                         rt->mf6c_origin.sin6_addr = ip6->ip6_src;
 1180                         rt->mf6c_mcastgrp.sin6_family = AF_INET6;
 1181                         rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
 1182                         rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
 1183                         rt->mf6c_expire = UPCALL_EXPIRE;
 1184                         n6expire[hash]++;
 1185                         rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
 1186 
 1187                         /* link into table */
 1188                         rt->mf6c_next  = mf6ctable[hash];
 1189                         mf6ctable[hash] = rt;
 1190                         /* Add this entry to the end of the queue */
 1191                         rt->mf6c_stall = rte;
 1192                 } else {
 1193                         /* determine if q has overflowed */
 1194                         struct rtdetq **p;
 1195                         int npkts = 0;
 1196 
 1197                         for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
 1198                                 if (++npkts > MAX_UPQ6) {
 1199                                         mrt6stat.mrt6s_upq_ovflw++;
 1200                                         free(rte, M_MRTABLE);
 1201                                         m_freem(mb0);
 1202                                         splx(s);
 1203                                         return (0);
 1204                                 }
 1205 
 1206                         /* Add this entry to the end of the queue */
 1207                         *p = rte;
 1208                 }
 1209 
 1210                 rte->next = NULL;
 1211                 rte->m = mb0;
 1212                 rte->ifp = ifp;
 1213 #ifdef UPCALL_TIMING
 1214                 rte->t = tp;
 1215 #endif /* UPCALL_TIMING */
 1216 
 1217                 splx(s);
 1218 
 1219                 return (0);
 1220         }
 1221 }
 1222 
 1223 /*
 1224  * Clean up cache entries if upcalls are not serviced
 1225  * Call from the Slow Timeout mechanism, every half second.
 1226  */
 1227 static void
 1228 expire_upcalls(unused)
 1229         void *unused;
 1230 {
 1231         struct rtdetq *rte;
 1232         struct mf6c *mfc, **nptr;
 1233         int i;
 1234         int s;
 1235 
 1236         s = splnet();
 1237         for (i = 0; i < MF6CTBLSIZ; i++) {
 1238                 if (n6expire[i] == 0)
 1239                         continue;
 1240                 nptr = &mf6ctable[i];
 1241                 while ((mfc = *nptr) != NULL) {
 1242                         rte = mfc->mf6c_stall;
 1243                         /*
 1244                          * Skip real cache entries
 1245                          * Make sure it wasn't marked to not expire (shouldn't happen)
 1246                          * If it expires now
 1247                          */
 1248                         if (rte != NULL &&
 1249                             mfc->mf6c_expire != 0 &&
 1250                             --mfc->mf6c_expire == 0) {
 1251 #ifdef MRT6DEBUG
 1252                                 if (mrt6debug & DEBUG_EXPIRE)
 1253                                         log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
 1254                                             ip6_sprintf(&mfc->mf6c_origin.sin6_addr),
 1255                                             ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr));
 1256 #endif
 1257                                 /*
 1258                                  * drop all the packets
 1259                                  * free the mbuf with the pkt, if, timing info
 1260                                  */
 1261                                 do {
 1262                                         struct rtdetq *n = rte->next;
 1263                                         m_freem(rte->m);
 1264                                         free(rte, M_MRTABLE);
 1265                                         rte = n;
 1266                                 } while (rte != NULL);
 1267                                 mrt6stat.mrt6s_cache_cleanups++;
 1268                                 n6expire[i]--;
 1269 
 1270                                 *nptr = mfc->mf6c_next;
 1271                                 free(mfc, M_MRTABLE);
 1272                         } else {
 1273                                 nptr = &mfc->mf6c_next;
 1274                         }
 1275                 }
 1276         }
 1277         splx(s);
 1278         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
 1279             expire_upcalls, NULL);
 1280 }
 1281 
 1282 /*
 1283  * Packet forwarding routine once entry in the cache is made
 1284  */
 1285 static int
 1286 ip6_mdq(m, ifp, rt)
 1287         struct mbuf *m;
 1288         struct ifnet *ifp;
 1289         struct mf6c *rt;
 1290 {
 1291         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1292         mifi_t mifi, iif;
 1293         struct mif6 *mifp;
 1294         int plen = m->m_pkthdr.len;
 1295         u_int32_t dscopein, sscopein;
 1296 
 1297 /*
 1298  * Macro to send packet on mif.  Since RSVP packets don't get counted on
 1299  * input, they shouldn't get counted on output, so statistics keeping is
 1300  * separate.
 1301  */
 1302 
 1303 #define MC6_SEND(ip6, mifp, m) do {                             \
 1304         if ((mifp)->m6_flags & MIFF_REGISTER)                   \
 1305                 register_send((ip6), (mifp), (m));              \
 1306         else                                                    \
 1307                 phyint_send((ip6), (mifp), (m));                \
 1308 } while (/*CONSTCOND*/ 0)
 1309 
 1310         /*
 1311          * Don't forward if it didn't arrive from the parent mif
 1312          * for its origin.
 1313          */
 1314         mifi = rt->mf6c_parent;
 1315         if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
 1316                 /* came in the wrong interface */
 1317 #ifdef MRT6DEBUG
 1318                 if (mrt6debug & DEBUG_FORWARD)
 1319                         log(LOG_DEBUG,
 1320                             "wrong if: ifid %d mifi %d mififid %x\n",
 1321                             ifp->if_index, mifi,
 1322                             mif6table[mifi].m6_ifp->if_index);
 1323 #endif
 1324                 mrt6stat.mrt6s_wrong_if++;
 1325                 rt->mf6c_wrong_if++;
 1326                 /*
 1327                  * If we are doing PIM processing, and we are forwarding
 1328                  * packets on this interface, send a message to the
 1329                  * routing daemon.
 1330                  */
 1331                 /* have to make sure this is a valid mif */
 1332                 if (mifi < nummifs && mif6table[mifi].m6_ifp)
 1333                         if (pim6 && (m->m_flags & M_LOOP) == 0) {
 1334                                 /*
 1335                                  * Check the M_LOOP flag to avoid an
 1336                                  * unnecessary PIM assert.
 1337                                  * XXX: M_LOOP is an ad-hoc hack...
 1338                                  */
 1339                                 static struct sockaddr_in6 sin6 =
 1340                                 { sizeof(sin6), AF_INET6 };
 1341 
 1342                                 struct mbuf *mm;
 1343                                 struct mrt6msg *im;
 1344 #ifdef MRT6_OINIT
 1345                                 struct omrt6msg *oim;
 1346 #endif
 1347 
 1348                                 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
 1349                                 if (mm &&
 1350                                     (M_HASCL(mm) ||
 1351                                      mm->m_len < sizeof(struct ip6_hdr)))
 1352                                         mm = m_pullup(mm, sizeof(struct ip6_hdr));
 1353                                 if (mm == NULL)
 1354                                         return (ENOBUFS);
 1355 
 1356 #ifdef MRT6_OINIT
 1357                                 oim = NULL;
 1358 #endif
 1359                                 im = NULL;
 1360                                 switch (ip6_mrouter_ver) {
 1361 #ifdef MRT6_OINIT
 1362                                 case MRT6_OINIT:
 1363                                         oim = mtod(mm, struct omrt6msg *);
 1364                                         oim->im6_msgtype = MRT6MSG_WRONGMIF;
 1365                                         oim->im6_mbz = 0;
 1366                                         break;
 1367 #endif
 1368                                 case MRT6_INIT:
 1369                                         im = mtod(mm, struct mrt6msg *);
 1370                                         im->im6_msgtype = MRT6MSG_WRONGMIF;
 1371                                         im->im6_mbz = 0;
 1372                                         break;
 1373                                 default:
 1374                                         m_freem(mm);
 1375                                         return (EINVAL);
 1376                                 }
 1377 
 1378                                 for (mifp = mif6table, iif = 0;
 1379                                      iif < nummifs && mifp &&
 1380                                              mifp->m6_ifp != ifp;
 1381                                      mifp++, iif++)
 1382                                         ;
 1383 
 1384                                 switch (ip6_mrouter_ver) {
 1385 #ifdef MRT6_OINIT
 1386                                 case MRT6_OINIT:
 1387                                         oim->im6_mif = iif;
 1388                                         sin6.sin6_addr = oim->im6_src;
 1389                                         break;
 1390 #endif
 1391                                 case MRT6_INIT:
 1392                                         im->im6_mif = iif;
 1393                                         sin6.sin6_addr = im->im6_src;
 1394                                         break;
 1395                                 }
 1396 
 1397                                 mrt6stat.mrt6s_upcalls++;
 1398 
 1399                                 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1400 #ifdef MRT6DEBUG
 1401                                         if (mrt6debug)
 1402                                                 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
 1403 #endif
 1404                                         ++mrt6stat.mrt6s_upq_sockfull;
 1405                                         return (ENOBUFS);
 1406                                 }       /* if socket Q full */
 1407                         }               /* if PIM */
 1408                 return (0);
 1409         }                       /* if wrong iif */
 1410 
 1411         /* If I sourced this packet, it counts as output, else it was input. */
 1412         if (m->m_pkthdr.rcvif == NULL) {
 1413                 /* XXX: is rcvif really NULL when output?? */
 1414                 mif6table[mifi].m6_pkt_out++;
 1415                 mif6table[mifi].m6_bytes_out += plen;
 1416         } else {
 1417                 mif6table[mifi].m6_pkt_in++;
 1418                 mif6table[mifi].m6_bytes_in += plen;
 1419         }
 1420         rt->mf6c_pkt_cnt++;
 1421         rt->mf6c_byte_cnt += plen;
 1422 
 1423         /*
 1424          * For each mif, forward a copy of the packet if there are group
 1425          * members downstream on the interface.
 1426          */
 1427         if (in6_addr2zoneid(ifp, &ip6->ip6_dst, &dscopein) ||
 1428             in6_addr2zoneid(ifp, &ip6->ip6_src, &sscopein))
 1429                 return (EINVAL);
 1430         for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
 1431                 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
 1432                         u_int32_t dscopeout, sscopeout;
 1433 
 1434                         /*
 1435                          * check if the outgoing packet is going to break
 1436                          * a scope boundary.
 1437                          * XXX For packets through PIM register tunnel
 1438                          * interface, we believe a routing daemon.
 1439                          */
 1440                         if (!(mif6table[rt->mf6c_parent].m6_flags &
 1441                               MIFF_REGISTER) &&
 1442                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
 1443                                 if (in6_addr2zoneid(mif6table[mifi].m6_ifp,
 1444                                                     &ip6->ip6_dst,
 1445                                                     &dscopeout) ||
 1446                                     in6_addr2zoneid(mif6table[mifi].m6_ifp,
 1447                                                     &ip6->ip6_src,
 1448                                                     &sscopeout) ||
 1449                                     dscopein != dscopeout ||
 1450                                     sscopein != sscopeout) {
 1451                                         ip6stat.ip6s_badscope++;
 1452                                         continue;
 1453                                 }
 1454                         }
 1455 
 1456                         mifp->m6_pkt_out++;
 1457                         mifp->m6_bytes_out += plen;
 1458                         MC6_SEND(ip6, mifp, m);
 1459                 }
 1460         }
 1461         return (0);
 1462 }
 1463 
 1464 static void
 1465 phyint_send(ip6, mifp, m)
 1466     struct ip6_hdr *ip6;
 1467     struct mif6 *mifp;
 1468     struct mbuf *m;
 1469 {
 1470         struct mbuf *mb_copy;
 1471         struct ifnet *ifp = mifp->m6_ifp;
 1472         int error = 0;
 1473         int s = splnet();       /* needs to protect static "ro" below. */
 1474         static struct route_in6 ro;
 1475         struct  in6_multi *in6m;
 1476         struct sockaddr_in6 *dst6;
 1477         u_long linkmtu;
 1478 
 1479         /*
 1480          * Make a new reference to the packet; make sure that
 1481          * the IPv6 header is actually copied, not just referenced,
 1482          * so that ip6_output() only scribbles on the copy.
 1483          */
 1484         mb_copy = m_copy(m, 0, M_COPYALL);
 1485         if (mb_copy &&
 1486             (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
 1487                 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
 1488         if (mb_copy == NULL) {
 1489                 splx(s);
 1490                 return;
 1491         }
 1492         /* set MCAST flag to the outgoing packet */
 1493         mb_copy->m_flags |= M_MCAST;
 1494 
 1495         /*
 1496          * If we sourced the packet, call ip6_output since we may devide
 1497          * the packet into fragments when the packet is too big for the
 1498          * outgoing interface.
 1499          * Otherwise, we can simply send the packet to the interface
 1500          * sending queue.
 1501          */
 1502         if (m->m_pkthdr.rcvif == NULL) {
 1503                 struct ip6_moptions im6o;
 1504 
 1505                 im6o.im6o_multicast_ifp = ifp;
 1506                 /* XXX: ip6_output will override ip6->ip6_hlim */
 1507                 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
 1508                 im6o.im6o_multicast_loop = 1;
 1509                 error = ip6_output(mb_copy, NULL, &ro,
 1510                                    IPV6_FORWARDING, &im6o, NULL, NULL);
 1511 
 1512 #ifdef MRT6DEBUG
 1513                 if (mrt6debug & DEBUG_XMIT)
 1514                         log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
 1515                             mifp - mif6table, error);
 1516 #endif
 1517                 splx(s);
 1518                 return;
 1519         }
 1520 
 1521         /*
 1522          * If we belong to the destination multicast group
 1523          * on the outgoing interface, loop back a copy.
 1524          */
 1525         dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
 1526         IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
 1527         if (in6m != NULL) {
 1528                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1529                 dst6->sin6_family = AF_INET6;
 1530                 dst6->sin6_addr = ip6->ip6_dst;
 1531                 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
 1532         }
 1533         /*
 1534          * Put the packet into the sending queue of the outgoing interface
 1535          * if it would fit in the MTU of the interface.
 1536          */
 1537         linkmtu = IN6_LINKMTU(ifp);
 1538         if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
 1539                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1540                 dst6->sin6_family = AF_INET6;
 1541                 dst6->sin6_addr = ip6->ip6_dst;
 1542                 /*
 1543                  * We just call if_output instead of nd6_output here, since
 1544                  * we need no ND for a multicast forwarded packet...right?
 1545                  */
 1546                 error = (*ifp->if_output)(ifp, mb_copy,
 1547                     (struct sockaddr *)&ro.ro_dst, NULL);
 1548 #ifdef MRT6DEBUG
 1549                 if (mrt6debug & DEBUG_XMIT)
 1550                         log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
 1551                             mifp - mif6table, error);
 1552 #endif
 1553         } else {
 1554 #ifdef MULTICAST_PMTUD
 1555                 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
 1556 #else
 1557 #ifdef MRT6DEBUG
 1558                 if (mrt6debug & DEBUG_XMIT)
 1559                         log(LOG_DEBUG,
 1560                             "phyint_send: packet too big on %s o %s g %s"
 1561                             " size %d(discarded)\n",
 1562                             if_name(ifp),
 1563                             ip6_sprintf(&ip6->ip6_src),
 1564                             ip6_sprintf(&ip6->ip6_dst),
 1565                             mb_copy->m_pkthdr.len);
 1566 #endif /* MRT6DEBUG */
 1567                 m_freem(mb_copy); /* simply discard the packet */
 1568 #endif
 1569         }
 1570 
 1571         splx(s);
 1572 }
 1573 
 1574 static int
 1575 register_send(ip6, mif, m)
 1576         struct ip6_hdr *ip6;
 1577         struct mif6 *mif;
 1578         struct mbuf *m;
 1579 {
 1580         struct mbuf *mm;
 1581         int i, len = m->m_pkthdr.len;
 1582         static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
 1583         struct mrt6msg *im6;
 1584 
 1585 #ifdef MRT6DEBUG
 1586         if (mrt6debug)
 1587                 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
 1588                     ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst));
 1589 #endif
 1590         ++pim6stat.pim6s_snd_registers;
 1591 
 1592         /* Make a copy of the packet to send to the user level process */
 1593         MGETHDR(mm, M_DONTWAIT, MT_HEADER);
 1594         if (mm == NULL)
 1595                 return (ENOBUFS);
 1596         mm->m_pkthdr.rcvif = NULL;
 1597         mm->m_data += max_linkhdr;
 1598         mm->m_len = sizeof(struct ip6_hdr);
 1599 
 1600         if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
 1601                 m_freem(mm);
 1602                 return (ENOBUFS);
 1603         }
 1604         i = MHLEN - M_LEADINGSPACE(mm);
 1605         if (i > len)
 1606                 i = len;
 1607         mm = m_pullup(mm, i);
 1608         if (mm == NULL)
 1609                 return (ENOBUFS);
 1610 /* TODO: check it! */
 1611         mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
 1612 
 1613         /*
 1614          * Send message to routing daemon
 1615          */
 1616         sin6.sin6_addr = ip6->ip6_src;
 1617 
 1618         im6 = mtod(mm, struct mrt6msg *);
 1619         im6->im6_msgtype      = MRT6MSG_WHOLEPKT;
 1620         im6->im6_mbz          = 0;
 1621 
 1622         im6->im6_mif = mif - mif6table;
 1623 
 1624         /* iif info is not given for reg. encap.n */
 1625         mrt6stat.mrt6s_upcalls++;
 1626 
 1627         if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1628 #ifdef MRT6DEBUG
 1629                 if (mrt6debug)
 1630                         log(LOG_WARNING,
 1631                             "register_send: ip6_mrouter socket queue full\n");
 1632 #endif
 1633                 ++mrt6stat.mrt6s_upq_sockfull;
 1634                 return (ENOBUFS);
 1635         }
 1636         return (0);
 1637 }
 1638 
 1639 /*
 1640  * PIM sparse mode hook
 1641  * Receives the pim control messages, and passes them up to the listening
 1642  * socket, using rip6_input.
 1643  * The only message processed is the REGISTER pim message; the pim header
 1644  * is stripped off, and the inner packet is passed to register_mforward.
 1645  */
 1646 int
 1647 pim6_input(mp, offp, proto)
 1648         struct mbuf **mp;
 1649         int *offp, proto;
 1650 {
 1651         struct pim *pim; /* pointer to a pim struct */
 1652         struct ip6_hdr *ip6;
 1653         int pimlen;
 1654         struct mbuf *m = *mp;
 1655         int minlen;
 1656         int off = *offp;
 1657 
 1658         ++pim6stat.pim6s_rcv_total;
 1659 
 1660         ip6 = mtod(m, struct ip6_hdr *);
 1661         pimlen = m->m_pkthdr.len - *offp;
 1662 
 1663         /*
 1664          * Validate lengths
 1665          */
 1666         if (pimlen < PIM_MINLEN) {
 1667                 ++pim6stat.pim6s_rcv_tooshort;
 1668 #ifdef MRT6DEBUG
 1669                 if (mrt6debug & DEBUG_PIM)
 1670                         log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
 1671 #endif
 1672                 m_freem(m);
 1673                 return (IPPROTO_DONE);
 1674         }
 1675 
 1676         /*
 1677          * if the packet is at least as big as a REGISTER, go ahead
 1678          * and grab the PIM REGISTER header size, to avoid another
 1679          * possible m_pullup() later.
 1680          *
 1681          * PIM_MINLEN       == pimhdr + u_int32 == 8
 1682          * PIM6_REG_MINLEN   == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
 1683          */
 1684         minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
 1685 
 1686         /*
 1687          * Make sure that the IP6 and PIM headers in contiguous memory, and
 1688          * possibly the PIM REGISTER header
 1689          */
 1690 #ifndef PULLDOWN_TEST
 1691         IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
 1692         /* adjust pointer */
 1693         ip6 = mtod(m, struct ip6_hdr *);
 1694 
 1695         /* adjust mbuf to point to the PIM header */
 1696         pim = (struct pim *)((caddr_t)ip6 + off);
 1697 #else
 1698         IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
 1699         if (pim == NULL) {
 1700                 pim6stat.pim6s_rcv_tooshort++;
 1701                 return (IPPROTO_DONE);
 1702         }
 1703 #endif
 1704 
 1705 #define PIM6_CHECKSUM
 1706 #ifdef PIM6_CHECKSUM
 1707         {
 1708                 int cksumlen;
 1709 
 1710                 /*
 1711                  * Validate checksum.
 1712                  * If PIM REGISTER, exclude the data packet
 1713                  */
 1714                 if (pim->pim_type == PIM_REGISTER)
 1715                         cksumlen = PIM_MINLEN;
 1716                 else
 1717                         cksumlen = pimlen;
 1718 
 1719                 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
 1720                         ++pim6stat.pim6s_rcv_badsum;
 1721 #ifdef MRT6DEBUG
 1722                         if (mrt6debug & DEBUG_PIM)
 1723                                 log(LOG_DEBUG,
 1724                                     "pim6_input: invalid checksum\n");
 1725 #endif
 1726                         m_freem(m);
 1727                         return (IPPROTO_DONE);
 1728                 }
 1729         }
 1730 #endif /* PIM_CHECKSUM */
 1731 
 1732         /* PIM version check */
 1733         if (pim->pim_ver != PIM_VERSION) {
 1734                 ++pim6stat.pim6s_rcv_badversion;
 1735 #ifdef MRT6DEBUG
 1736                 log(LOG_ERR,
 1737                     "pim6_input: incorrect version %d, expecting %d\n",
 1738                     pim->pim_ver, PIM_VERSION);
 1739 #endif
 1740                 m_freem(m);
 1741                 return (IPPROTO_DONE);
 1742         }
 1743 
 1744         if (pim->pim_type == PIM_REGISTER) {
 1745                 /*
 1746                  * since this is a REGISTER, we'll make a copy of the register
 1747                  * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
 1748                  * routing daemon.
 1749                  */
 1750                 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
 1751 
 1752                 struct mbuf *mcp;
 1753                 struct ip6_hdr *eip6;
 1754                 u_int32_t *reghdr;
 1755                 int rc;
 1756 
 1757                 ++pim6stat.pim6s_rcv_registers;
 1758 
 1759                 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
 1760 #ifdef MRT6DEBUG
 1761                         if (mrt6debug & DEBUG_PIM)
 1762                                 log(LOG_DEBUG,
 1763                                     "pim6_input: register mif not set: %d\n",
 1764                                     reg_mif_num);
 1765 #endif
 1766                         m_freem(m);
 1767                         return (IPPROTO_DONE);
 1768                 }
 1769 
 1770                 reghdr = (u_int32_t *)(pim + 1);
 1771 
 1772                 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
 1773                         goto pim6_input_to_daemon;
 1774 
 1775                 /*
 1776                  * Validate length
 1777                  */
 1778                 if (pimlen < PIM6_REG_MINLEN) {
 1779                         ++pim6stat.pim6s_rcv_tooshort;
 1780                         ++pim6stat.pim6s_rcv_badregisters;
 1781 #ifdef MRT6DEBUG
 1782                         log(LOG_ERR,
 1783                             "pim6_input: register packet size too "
 1784                             "small %d from %s\n",
 1785                             pimlen, ip6_sprintf(&ip6->ip6_src));
 1786 #endif
 1787                         m_freem(m);
 1788                         return (IPPROTO_DONE);
 1789                 }
 1790 
 1791                 eip6 = (struct ip6_hdr *) (reghdr + 1);
 1792 #ifdef MRT6DEBUG
 1793                 if (mrt6debug & DEBUG_PIM)
 1794                         log(LOG_DEBUG,
 1795                             "pim6_input[register], eip6: %s -> %s, "
 1796                             "eip6 plen %d\n",
 1797                             ip6_sprintf(&eip6->ip6_src),
 1798                             ip6_sprintf(&eip6->ip6_dst),
 1799                             ntohs(eip6->ip6_plen));
 1800 #endif
 1801 
 1802                 /* verify the version number of the inner packet */
 1803                 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
 1804                         ++pim6stat.pim6s_rcv_badregisters;
 1805 #ifdef MRT6DEBUG
 1806                         log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
 1807                             "of the inner packet\n",
 1808                             (eip6->ip6_vfc & IPV6_VERSION));
 1809 #endif
 1810                         m_freem(m);
 1811                         return (IPPROTO_NONE);
 1812                 }
 1813 
 1814                 /* verify the inner packet is destined to a mcast group */
 1815                 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
 1816                         ++pim6stat.pim6s_rcv_badregisters;
 1817 #ifdef MRT6DEBUG
 1818                         if (mrt6debug & DEBUG_PIM)
 1819                                 log(LOG_DEBUG,
 1820                                     "pim6_input: inner packet of register "
 1821                                     "is not multicast %s\n",
 1822                                     ip6_sprintf(&eip6->ip6_dst));
 1823 #endif
 1824                         m_freem(m);
 1825                         return (IPPROTO_DONE);
 1826                 }
 1827 
 1828                 /*
 1829                  * make a copy of the whole header to pass to the daemon later.
 1830                  */
 1831                 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
 1832                 if (mcp == NULL) {
 1833 #ifdef MRT6DEBUG
 1834                         log(LOG_ERR,
 1835                             "pim6_input: pim register: "
 1836                             "could not copy register head\n");
 1837 #endif
 1838                         m_freem(m);
 1839                         return (IPPROTO_DONE);
 1840                 }
 1841 
 1842                 /*
 1843                  * forward the inner ip6 packet; point m_data at the inner ip6.
 1844                  */
 1845                 m_adj(m, off + PIM_MINLEN);
 1846 #ifdef MRT6DEBUG
 1847                 if (mrt6debug & DEBUG_PIM) {
 1848                         log(LOG_DEBUG,
 1849                             "pim6_input: forwarding decapsulated register: "
 1850                             "src %s, dst %s, mif %d\n",
 1851                             ip6_sprintf(&eip6->ip6_src),
 1852                             ip6_sprintf(&eip6->ip6_dst),
 1853                             reg_mif_num);
 1854                 }
 1855 #endif
 1856 
 1857                 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
 1858                                 dst.sin6_family, 0);
 1859 
 1860                 /* prepare the register head to send to the mrouting daemon */
 1861                 m = mcp;
 1862         }
 1863 
 1864         /*
 1865          * Pass the PIM message up to the daemon; if it is a register message
 1866          * pass the 'head' only up to the daemon. This includes the
 1867          * encapsulator ip6 header, pim header, register header and the
 1868          * encapsulated ip6 header.
 1869          */
 1870   pim6_input_to_daemon:
 1871         rip6_input(&m, offp, proto);
 1872         return (IPPROTO_DONE);
 1873 }

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