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 /*      $FreeBSD$       */
    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/sysctl.h>
  100 #include <sys/syslog.h>
  101 #include <sys/systm.h>
  102 #include <sys/time.h>
  103 
  104 #include <net/if.h>
  105 #include <net/if_types.h>
  106 #include <net/raw_cb.h>
  107 #include <net/route.h>
  108 
  109 #include <netinet/in.h>
  110 #include <netinet/in_var.h>
  111 #include <netinet/icmp6.h>
  112 
  113 #include <netinet/ip6.h>
  114 #include <netinet6/ip6_var.h>
  115 #include <netinet6/scope6_var.h>
  116 #include <netinet6/nd6.h>
  117 #include <netinet6/ip6_mroute.h>
  118 #include <netinet6/ip6protosw.h>
  119 #include <netinet6/pim6.h>
  120 #include <netinet6/pim6_var.h>
  121 
  122 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
  123 
  124 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
  125 #define M_HASCL(m) ((m)->m_flags & M_EXT)
  126 
  127 static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *));
  128 static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *));
  129 
  130 static int set_pim6 __P((int *));
  131 static int socket_send __P((struct socket *, struct mbuf *,
  132             struct sockaddr_in6 *));
  133 static int register_send __P((struct ip6_hdr *, struct mif6 *,
  134             struct mbuf *));
  135 
  136 extern struct domain inet6domain;
  137 
  138 /* XXX: referenced from ip_mroute.c for dynamically loading this code. */
  139 struct ip6protosw in6_pim_protosw = {
  140         .pr_type =              SOCK_RAW,
  141         .pr_domain =            &inet6domain,
  142         .pr_protocol =          IPPROTO_PIM,
  143         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  144         .pr_input =             pim6_input,
  145         .pr_output =            rip6_output,
  146         .pr_ctloutput =         rip6_ctloutput,
  147         .pr_usrreqs =           &rip6_usrreqs
  148 };
  149 
  150 static int ip6_mrouter_ver = 0;
  151 
  152 SYSCTL_DECL(_net_inet6);
  153 SYSCTL_DECL(_net_inet6_ip6);
  154 SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
  155 
  156 static struct mrt6stat mrt6stat;
  157 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
  158     &mrt6stat, mrt6stat,
  159     "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
  160 
  161 #define NO_RTE_FOUND    0x1
  162 #define RTE_FOUND       0x2
  163 
  164 static struct mf6c *mf6ctable[MF6CTBLSIZ];
  165 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
  166     &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
  167     "Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
  168     "netinet6/ip6_mroute.h)");
  169 
  170 static u_char n6expire[MF6CTBLSIZ];
  171 
  172 static struct mif6 mif6table[MAXMIFS];
  173 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
  174     &mif6table, sizeof(mif6table), "S,vif[MAXMIFS]",
  175     "Multicast Interfaces (struct mif[MAXMIFS], netinet6/ip6_mroute.h)");
  176 
  177 #ifdef MRT6DEBUG
  178 static u_int mrt6debug = 0;             /* debug level */
  179 #define DEBUG_MFC       0x02
  180 #define DEBUG_FORWARD   0x04
  181 #define DEBUG_EXPIRE    0x08
  182 #define DEBUG_XMIT      0x10
  183 #define DEBUG_REG       0x20
  184 #define DEBUG_PIM       0x40
  185 #endif
  186 
  187 static void     expire_upcalls __P((void *));
  188 #define EXPIRE_TIMEOUT  (hz / 4)        /* 4x / second */
  189 #define UPCALL_EXPIRE   6               /* number of timeouts */
  190 
  191 #ifdef INET
  192 #ifdef MROUTING
  193 extern struct socket *ip_mrouter;
  194 #endif
  195 #endif
  196 
  197 /*
  198  * 'Interfaces' associated with decapsulator (so we can tell
  199  * packets that went through it from ones that get reflected
  200  * by a broken gateway).  Different from IPv4 register_if,
  201  * these interfaces are linked into the system ifnet list,
  202  * because per-interface IPv6 statistics are maintained in
  203  * ifp->if_afdata.  But it does not have any routes point
  204  * to them.  I.e., packets can't be sent this way.  They
  205  * only exist as a placeholder for multicast source
  206  * verification.
  207  */
  208 static struct ifnet *multicast_register_if6;
  209 
  210 #define ENCAP_HOPS 64
  211 
  212 /*
  213  * Private variables.
  214  */
  215 static mifi_t nummifs = 0;
  216 static mifi_t reg_mif_num = (mifi_t)-1;
  217 
  218 static struct pim6stat pim6stat;
  219 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD,
  220     &pim6stat, pim6stat,
  221     "PIM Statistics (struct pim6stat, netinet6/pim_var.h)");
  222 
  223 static int pim6;
  224 
  225 /*
  226  * Hash function for a source, group entry
  227  */
  228 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
  229                                    (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
  230                                    (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
  231                                    (g).s6_addr32[2] ^ (g).s6_addr32[3])
  232 
  233 /*
  234  * Find a route for a given origin IPv6 address and Multicast group address.
  235  */
  236 #define MF6CFIND(o, g, rt) do { \
  237         struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
  238         rt = NULL; \
  239         mrt6stat.mrt6s_mfc_lookups++; \
  240         while (_rt) { \
  241                 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
  242                     IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
  243                     (_rt->mf6c_stall == NULL)) { \
  244                         rt = _rt; \
  245                         break; \
  246                 } \
  247                 _rt = _rt->mf6c_next; \
  248         } \
  249         if (rt == NULL) { \
  250                 mrt6stat.mrt6s_mfc_misses++; \
  251         } \
  252 } while (/*CONSTCOND*/ 0)
  253 
  254 /*
  255  * Macros to compute elapsed time efficiently
  256  * Borrowed from Van Jacobson's scheduling code
  257  * XXX: replace with timersub() ?
  258  */
  259 #define TV_DELTA(a, b, delta) do { \
  260             int xxs; \
  261                 \
  262             delta = (a).tv_usec - (b).tv_usec; \
  263             if ((xxs = (a).tv_sec - (b).tv_sec)) { \
  264                switch (xxs) { \
  265                       case 2: \
  266                           delta += 1000000; \
  267                               /* FALLTHROUGH */ \
  268                       case 1: \
  269                           delta += 1000000; \
  270                           break; \
  271                       default: \
  272                           delta += (1000000 * xxs); \
  273                } \
  274             } \
  275 } while (/*CONSTCOND*/ 0)
  276 
  277 /* XXX: replace with timercmp(a, b, <) ? */
  278 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
  279               (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
  280 
  281 #ifdef UPCALL_TIMING
  282 #define UPCALL_MAX      50
  283 static u_long upcall_data[UPCALL_MAX + 1];
  284 static void collate();
  285 #endif /* UPCALL_TIMING */
  286 
  287 static int get_sg_cnt __P((struct sioc_sg_req6 *));
  288 static int get_mif6_cnt __P((struct sioc_mif_req6 *));
  289 static int ip6_mrouter_init __P((struct socket *, int, int));
  290 static int add_m6if __P((struct mif6ctl *));
  291 static int del_m6if __P((mifi_t *));
  292 static int add_m6fc __P((struct mf6cctl *));
  293 static int del_m6fc __P((struct mf6cctl *));
  294 
  295 static struct callout expire_upcalls_ch;
  296 
  297 int X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m);
  298 int X_ip6_mrouter_done(void);
  299 int X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt);
  300 int X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt);
  301 int X_mrt6_ioctl(int cmd, caddr_t data);
  302 
  303 /*
  304  * Handle MRT setsockopt commands to modify the multicast routing tables.
  305  */
  306 int
  307 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
  308 {
  309         int error = 0;
  310         int optval;
  311         struct mif6ctl mifc;
  312         struct mf6cctl mfcc;
  313         mifi_t mifi;
  314 
  315         if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
  316                 return (EACCES);
  317 
  318         switch (sopt->sopt_name) {
  319         case MRT6_INIT:
  320 #ifdef MRT6_OINIT
  321         case MRT6_OINIT:
  322 #endif
  323                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  324                     sizeof(optval));
  325                 if (error)
  326                         break;
  327                 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
  328                 break;
  329         case MRT6_DONE:
  330                 error = X_ip6_mrouter_done();
  331                 break;
  332         case MRT6_ADD_MIF:
  333                 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
  334                 if (error)
  335                         break;
  336                 error = add_m6if(&mifc);
  337                 break;
  338         case MRT6_ADD_MFC:
  339                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  340                 if (error)
  341                         break;
  342                 error = add_m6fc(&mfcc);
  343                 break;
  344         case MRT6_DEL_MFC:
  345                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  346                 if (error)
  347                         break;
  348                 error = del_m6fc(&mfcc);
  349                 break;
  350         case MRT6_DEL_MIF:
  351                 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
  352                 if (error)
  353                         break;
  354                 error = del_m6if(&mifi);
  355                 break;
  356         case MRT6_PIM:
  357                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  358                     sizeof(optval));
  359                 if (error)
  360                         break;
  361                 error = set_pim6(&optval);
  362                 break;
  363         default:
  364                 error = EOPNOTSUPP;
  365                 break;
  366         }
  367 
  368         return (error);
  369 }
  370 
  371 /*
  372  * Handle MRT getsockopt commands
  373  */
  374 int
  375 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
  376 {
  377         int error = 0;
  378 
  379         if (so != ip6_mrouter)
  380                 return (EACCES);
  381 
  382         switch (sopt->sopt_name) {
  383                 case MRT6_PIM:
  384                         error = sooptcopyout(sopt, &pim6, sizeof(pim6));
  385                         break;
  386         }
  387         return (error);
  388 }
  389 
  390 /*
  391  * Handle ioctl commands to obtain information from the cache
  392  */
  393 int
  394 X_mrt6_ioctl(int cmd, caddr_t data)
  395 {
  396         switch (cmd) {
  397         case SIOCGETSGCNT_IN6:
  398                 return (get_sg_cnt((struct sioc_sg_req6 *)data));
  399         case SIOCGETMIFCNT_IN6:
  400                 return (get_mif6_cnt((struct sioc_mif_req6 *)data));
  401         default:
  402                 return (EINVAL);
  403         }
  404 }
  405 
  406 /*
  407  * returns the packet, byte, rpf-failure count for the source group provided
  408  */
  409 static int
  410 get_sg_cnt(struct sioc_sg_req6 *req)
  411 {
  412         struct mf6c *rt;
  413         int s;
  414 
  415         s = splnet();
  416         MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
  417         splx(s);
  418         if (rt != NULL) {
  419                 req->pktcnt = rt->mf6c_pkt_cnt;
  420                 req->bytecnt = rt->mf6c_byte_cnt;
  421                 req->wrong_if = rt->mf6c_wrong_if;
  422         } else
  423                 return (ESRCH);
  424 #if 0
  425                 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
  426 #endif
  427 
  428         return (0);
  429 }
  430 
  431 /*
  432  * returns the input and output packet and byte counts on the mif provided
  433  */
  434 static int
  435 get_mif6_cnt(struct sioc_mif_req6 *req)
  436 {
  437         mifi_t mifi = req->mifi;
  438 
  439         if (mifi >= nummifs)
  440                 return (EINVAL);
  441 
  442         req->icount = mif6table[mifi].m6_pkt_in;
  443         req->ocount = mif6table[mifi].m6_pkt_out;
  444         req->ibytes = mif6table[mifi].m6_bytes_in;
  445         req->obytes = mif6table[mifi].m6_bytes_out;
  446 
  447         return (0);
  448 }
  449 
  450 static int
  451 set_pim6(int *i)
  452 {
  453         if ((*i != 1) && (*i != 0))
  454                 return (EINVAL);
  455 
  456         pim6 = *i;
  457 
  458         return (0);
  459 }
  460 
  461 /*
  462  * Enable multicast routing
  463  */
  464 static int
  465 ip6_mrouter_init(struct socket *so, int v, int cmd)
  466 {
  467 #ifdef MRT6DEBUG
  468         if (mrt6debug)
  469                 log(LOG_DEBUG,
  470                     "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
  471                     so->so_type, so->so_proto->pr_protocol);
  472 #endif
  473 
  474         if (so->so_type != SOCK_RAW ||
  475             so->so_proto->pr_protocol != IPPROTO_ICMPV6)
  476                 return (EOPNOTSUPP);
  477 
  478         if (v != 1)
  479                 return (ENOPROTOOPT);
  480 
  481         if (ip6_mrouter != NULL)
  482                 return (EADDRINUSE);
  483 
  484         ip6_mrouter = so;
  485         ip6_mrouter_ver = cmd;
  486 
  487         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  488         bzero((caddr_t)n6expire, sizeof(n6expire));
  489 
  490         pim6 = 0;/* used for stubbing out/in pim stuff */
  491 
  492         callout_init(&expire_upcalls_ch, 0);
  493         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
  494             expire_upcalls, NULL);
  495 
  496 #ifdef MRT6DEBUG
  497         if (mrt6debug)
  498                 log(LOG_DEBUG, "ip6_mrouter_init\n");
  499 #endif
  500 
  501         return (0);
  502 }
  503 
  504 /*
  505  * Disable multicast routing
  506  */
  507 int
  508 X_ip6_mrouter_done(void)
  509 {
  510         mifi_t mifi;
  511         int i;
  512         struct mf6c *rt;
  513         struct rtdetq *rte;
  514         int s;
  515 
  516         s = splnet();
  517 
  518         /*
  519          * For each phyint in use, disable promiscuous reception of all IPv6
  520          * multicasts.
  521          */
  522 #ifdef INET
  523 #ifdef MROUTING
  524         /*
  525          * If there is still IPv4 multicast routing daemon,
  526          * we remain interfaces to receive all muliticasted packets.
  527          * XXX: there may be an interface in which the IPv4 multicast
  528          * daemon is not interested...
  529          */
  530         if (!ip_mrouter)
  531 #endif
  532 #endif
  533         {
  534                 for (mifi = 0; mifi < nummifs; mifi++) {
  535                         if (mif6table[mifi].m6_ifp &&
  536                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
  537                                 if_allmulti(mif6table[mifi].m6_ifp, 0);
  538                         }
  539                 }
  540         }
  541         bzero((caddr_t)mif6table, sizeof(mif6table));
  542         nummifs = 0;
  543 
  544         pim6 = 0; /* used to stub out/in pim specific code */
  545 
  546         callout_stop(&expire_upcalls_ch);
  547 
  548         /*
  549          * Free all multicast forwarding cache entries.
  550          */
  551         for (i = 0; i < MF6CTBLSIZ; i++) {
  552                 rt = mf6ctable[i];
  553                 while (rt) {
  554                         struct mf6c *frt;
  555 
  556                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  557                                 struct rtdetq *n = rte->next;
  558 
  559                                 m_free(rte->m);
  560                                 free(rte, M_MRTABLE6);
  561                                 rte = n;
  562                         }
  563                         frt = rt;
  564                         rt = rt->mf6c_next;
  565                         free(frt, M_MRTABLE6);
  566                 }
  567         }
  568 
  569         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  570 
  571         /*
  572          * Reset register interface
  573          */
  574         if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
  575                 if_detach(multicast_register_if6);
  576                 if_free(multicast_register_if6);
  577                 reg_mif_num = (mifi_t)-1;
  578                 multicast_register_if6 = NULL;
  579         }
  580 
  581         ip6_mrouter = NULL;
  582         ip6_mrouter_ver = 0;
  583 
  584         splx(s);
  585 
  586 #ifdef MRT6DEBUG
  587         if (mrt6debug)
  588                 log(LOG_DEBUG, "ip6_mrouter_done\n");
  589 #endif
  590 
  591         return (0);
  592 }
  593 
  594 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
  595 
  596 /*
  597  * Add a mif to the mif table
  598  */
  599 static int
  600 add_m6if(struct mif6ctl *mifcp)
  601 {
  602         struct mif6 *mifp;
  603         struct ifnet *ifp;
  604         int error, s;
  605 
  606         if (mifcp->mif6c_mifi >= MAXMIFS)
  607                 return (EINVAL);
  608         mifp = mif6table + mifcp->mif6c_mifi;
  609         if (mifp->m6_ifp)
  610                 return (EADDRINUSE); /* XXX: is it appropriate? */
  611         if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
  612                 return (ENXIO);
  613         ifp = ifnet_byindex(mifcp->mif6c_pifi);
  614 
  615         if (mifcp->mif6c_flags & MIFF_REGISTER) {
  616                 if (reg_mif_num == (mifi_t)-1) {
  617                         ifp = if_alloc(IFT_OTHER);
  618 
  619                         if_initname(ifp, "register_mif", 0);
  620                         ifp->if_flags |= IFF_LOOPBACK;
  621                         if_attach(ifp);
  622                         multicast_register_if6 = ifp;
  623                         reg_mif_num = mifcp->mif6c_mifi;
  624                         /*
  625                          * it is impossible to guess the ifindex of the
  626                          * register interface.  So mif6c_pifi is automatically
  627                          * calculated.
  628                          */
  629                         mifcp->mif6c_pifi = ifp->if_index;
  630                 } else {
  631                         ifp = multicast_register_if6;
  632                 }
  633 
  634         } /* if REGISTER */
  635         else {
  636                 /* Make sure the interface supports multicast */
  637                 if ((ifp->if_flags & IFF_MULTICAST) == 0)
  638                         return (EOPNOTSUPP);
  639 
  640                 s = splnet();
  641                 error = if_allmulti(ifp, 1);
  642                 splx(s);
  643                 if (error)
  644                         return (error);
  645         }
  646 
  647         s = splnet();
  648         mifp->m6_flags     = mifcp->mif6c_flags;
  649         mifp->m6_ifp       = ifp;
  650 
  651         /* initialize per mif pkt counters */
  652         mifp->m6_pkt_in    = 0;
  653         mifp->m6_pkt_out   = 0;
  654         mifp->m6_bytes_in  = 0;
  655         mifp->m6_bytes_out = 0;
  656         splx(s);
  657 
  658         /* Adjust nummifs up if the mifi is higher than nummifs */
  659         if (nummifs <= mifcp->mif6c_mifi)
  660                 nummifs = mifcp->mif6c_mifi + 1;
  661 
  662 #ifdef MRT6DEBUG
  663         if (mrt6debug)
  664                 log(LOG_DEBUG,
  665                     "add_mif #%d, phyint %s\n",
  666                     mifcp->mif6c_mifi,
  667                     ifp->if_xname);
  668 #endif
  669 
  670         return (0);
  671 }
  672 
  673 /*
  674  * Delete a mif from the mif table
  675  */
  676 static int
  677 del_m6if(mifi_t *mifip)
  678 {
  679         struct mif6 *mifp = mif6table + *mifip;
  680         mifi_t mifi;
  681         struct ifnet *ifp;
  682         int s;
  683 
  684         if (*mifip >= nummifs)
  685                 return (EINVAL);
  686         if (mifp->m6_ifp == NULL)
  687                 return (EINVAL);
  688 
  689         s = splnet();
  690 
  691         if (!(mifp->m6_flags & MIFF_REGISTER)) {
  692                 /*
  693                  * XXX: what if there is yet IPv4 multicast daemon
  694                  *      using the interface?
  695                  */
  696                 ifp = mifp->m6_ifp;
  697 
  698                 if_allmulti(ifp, 0);
  699         } else {
  700                 if (reg_mif_num != (mifi_t)-1 &&
  701                     multicast_register_if6 != NULL) {
  702                         if_detach(multicast_register_if6);
  703                         if_free(multicast_register_if6);
  704                         reg_mif_num = (mifi_t)-1;
  705                         multicast_register_if6 = NULL;
  706                 }
  707         }
  708 
  709         bzero((caddr_t)mifp, sizeof(*mifp));
  710 
  711         /* Adjust nummifs down */
  712         for (mifi = nummifs; mifi > 0; mifi--)
  713                 if (mif6table[mifi - 1].m6_ifp)
  714                         break;
  715         nummifs = mifi;
  716 
  717         splx(s);
  718 
  719 #ifdef MRT6DEBUG
  720         if (mrt6debug)
  721                 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
  722 #endif
  723 
  724         return (0);
  725 }
  726 
  727 /*
  728  * Add an mfc entry
  729  */
  730 static int
  731 add_m6fc(struct mf6cctl *mfccp)
  732 {
  733         struct mf6c *rt;
  734         u_long hash;
  735         struct rtdetq *rte;
  736         u_short nstl;
  737         int s;
  738         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  739 
  740         MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
  741                  mfccp->mf6cc_mcastgrp.sin6_addr, rt);
  742 
  743         /* If an entry already exists, just update the fields */
  744         if (rt) {
  745 #ifdef MRT6DEBUG
  746                 if (mrt6debug & DEBUG_MFC) {
  747                     log(LOG_DEBUG,
  748                         "add_m6fc no upcall h %d o %s g %s p %x\n",
  749                         ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  750                         ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  751                         mfccp->mf6cc_parent);
  752                 }
  753 #endif
  754 
  755                 s = splnet();
  756                 rt->mf6c_parent = mfccp->mf6cc_parent;
  757                 rt->mf6c_ifset = mfccp->mf6cc_ifset;
  758                 splx(s);
  759                 return (0);
  760         }
  761 
  762         /*
  763          * Find the entry for which the upcall was made and update
  764          */
  765         s = splnet();
  766         hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
  767                         mfccp->mf6cc_mcastgrp.sin6_addr);
  768         for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
  769                 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  770                                        &mfccp->mf6cc_origin.sin6_addr) &&
  771                     IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  772                                        &mfccp->mf6cc_mcastgrp.sin6_addr) &&
  773                     (rt->mf6c_stall != NULL)) {
  774 
  775                         if (nstl++)
  776                                 log(LOG_ERR,
  777                                     "add_m6fc: %s o %s g %s p %x dbx %p\n",
  778                                     "multiple kernel entries",
  779                                     ip6_sprintf(ip6bufo,
  780                                             &mfccp->mf6cc_origin.sin6_addr),
  781                                     ip6_sprintf(ip6bufg,
  782                                             &mfccp->mf6cc_mcastgrp.sin6_addr),
  783                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  784 
  785 #ifdef MRT6DEBUG
  786                         if (mrt6debug & DEBUG_MFC)
  787                                 log(LOG_DEBUG,
  788                                     "add_m6fc o %s g %s p %x dbg %x\n",
  789                                     ip6_sprintf(ip6bufo,
  790                                             &mfccp->mf6cc_origin.sin6_addr),
  791                                     ip6_sprintf(ip6bufg,
  792                                             &mfccp->mf6cc_mcastgrp.sin6_addr),
  793                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  794 #endif
  795 
  796                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  797                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  798                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  799                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  800                         /* initialize pkt counters per src-grp */
  801                         rt->mf6c_pkt_cnt    = 0;
  802                         rt->mf6c_byte_cnt   = 0;
  803                         rt->mf6c_wrong_if   = 0;
  804 
  805                         rt->mf6c_expire = 0;    /* Don't clean this guy up */
  806                         n6expire[hash]--;
  807 
  808                         /* free packets Qed at the end of this entry */
  809                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  810                                 struct rtdetq *n = rte->next;
  811                                 ip6_mdq(rte->m, rte->ifp, rt);
  812                                 m_freem(rte->m);
  813 #ifdef UPCALL_TIMING
  814                                 collate(&(rte->t));
  815 #endif /* UPCALL_TIMING */
  816                                 free(rte, M_MRTABLE6);
  817                                 rte = n;
  818                         }
  819                         rt->mf6c_stall = NULL;
  820                 }
  821         }
  822 
  823         /*
  824          * It is possible that an entry is being inserted without an upcall
  825          */
  826         if (nstl == 0) {
  827 #ifdef MRT6DEBUG
  828                 if (mrt6debug & DEBUG_MFC)
  829                     log(LOG_DEBUG,
  830                         "add_mfc no upcall h %d o %s g %s p %x\n",
  831                         hash,
  832                         ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  833                         ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  834                         mfccp->mf6cc_parent);
  835 #endif
  836 
  837                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
  838 
  839                         if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  840                                                &mfccp->mf6cc_origin.sin6_addr)&&
  841                             IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  842                                                &mfccp->mf6cc_mcastgrp.sin6_addr)) {
  843 
  844                                 rt->mf6c_origin     = mfccp->mf6cc_origin;
  845                                 rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  846                                 rt->mf6c_parent     = mfccp->mf6cc_parent;
  847                                 rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  848                                 /* initialize pkt counters per src-grp */
  849                                 rt->mf6c_pkt_cnt    = 0;
  850                                 rt->mf6c_byte_cnt   = 0;
  851                                 rt->mf6c_wrong_if   = 0;
  852 
  853                                 if (rt->mf6c_expire)
  854                                         n6expire[hash]--;
  855                                 rt->mf6c_expire    = 0;
  856                         }
  857                 }
  858                 if (rt == NULL) {
  859                         /* no upcall, so make a new entry */
  860                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
  861                                                   M_NOWAIT);
  862                         if (rt == NULL) {
  863                                 splx(s);
  864                                 return (ENOBUFS);
  865                         }
  866 
  867                         /* insert new entry at head of hash chain */
  868                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  869                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  870                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  871                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  872                         /* initialize pkt counters per src-grp */
  873                         rt->mf6c_pkt_cnt    = 0;
  874                         rt->mf6c_byte_cnt   = 0;
  875                         rt->mf6c_wrong_if   = 0;
  876                         rt->mf6c_expire     = 0;
  877                         rt->mf6c_stall = NULL;
  878 
  879                         /* link into table */
  880                         rt->mf6c_next  = mf6ctable[hash];
  881                         mf6ctable[hash] = rt;
  882                 }
  883         }
  884         splx(s);
  885         return (0);
  886 }
  887 
  888 #ifdef UPCALL_TIMING
  889 /*
  890  * collect delay statistics on the upcalls
  891  */
  892 static void
  893 collate(struct timeval *t)
  894 {
  895         u_long d;
  896         struct timeval tp;
  897         u_long delta;
  898 
  899         GET_TIME(tp);
  900 
  901         if (TV_LT(*t, tp))
  902         {
  903                 TV_DELTA(tp, *t, delta);
  904 
  905                 d = delta >> 10;
  906                 if (d > UPCALL_MAX)
  907                         d = UPCALL_MAX;
  908 
  909                 ++upcall_data[d];
  910         }
  911 }
  912 #endif /* UPCALL_TIMING */
  913 
  914 /*
  915  * Delete an mfc entry
  916  */
  917 static int
  918 del_m6fc(struct mf6cctl *mfccp)
  919 {
  920         struct sockaddr_in6     origin;
  921         struct sockaddr_in6     mcastgrp;
  922         struct mf6c             *rt;
  923         struct mf6c             **nptr;
  924         u_long          hash;
  925         int s;
  926 
  927         origin = mfccp->mf6cc_origin;
  928         mcastgrp = mfccp->mf6cc_mcastgrp;
  929         hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
  930 
  931 #ifdef MRT6DEBUG
  932         if (mrt6debug & DEBUG_MFC) {
  933                 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  934                 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
  935                     ip6_sprintf(ip6bufo, &origin.sin6_addr),
  936                     ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
  937         }
  938 #endif
  939 
  940         s = splnet();
  941 
  942         nptr = &mf6ctable[hash];
  943         while ((rt = *nptr) != NULL) {
  944                 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
  945                                        &rt->mf6c_origin.sin6_addr) &&
  946                     IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
  947                                        &rt->mf6c_mcastgrp.sin6_addr) &&
  948                     rt->mf6c_stall == NULL)
  949                         break;
  950 
  951                 nptr = &rt->mf6c_next;
  952         }
  953         if (rt == NULL) {
  954                 splx(s);
  955                 return (EADDRNOTAVAIL);
  956         }
  957 
  958         *nptr = rt->mf6c_next;
  959         free(rt, M_MRTABLE6);
  960 
  961         splx(s);
  962 
  963         return (0);
  964 }
  965 
  966 static int
  967 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
  968 {
  969 
  970         if (s) {
  971                 if (sbappendaddr(&s->so_rcv,
  972                                  (struct sockaddr *)src,
  973                                  mm, (struct mbuf *)0) != 0) {
  974                         sorwakeup(s);
  975                         return (0);
  976                 }
  977         }
  978         m_freem(mm);
  979         return (-1);
  980 }
  981 
  982 /*
  983  * IPv6 multicast forwarding function. This function assumes that the packet
  984  * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
  985  * pointed to by "ifp", and the packet is to be relayed to other networks
  986  * that have members of the packet's destination IPv6 multicast group.
  987  *
  988  * The packet is returned unscathed to the caller, unless it is
  989  * erroneous, in which case a non-zero return value tells the caller to
  990  * discard it.
  991  *
  992  * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
  993  * this function is called in the originating context (i.e., not when
  994  * forwarding a packet from other node).  ip6_output(), which is currently the
  995  * only function that calls this function is called in the originating context,
  996  * explicitly ensures this condition.  It is caller's responsibility to ensure
  997  * that if this function is called from somewhere else in the originating
  998  * context in the future.
  999  */
 1000 int
 1001 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
 1002 {
 1003         struct mf6c *rt;
 1004         struct mif6 *mifp;
 1005         struct mbuf *mm;
 1006         int s;
 1007         mifi_t mifi;
 1008         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1009 
 1010 #ifdef MRT6DEBUG
 1011         if (mrt6debug & DEBUG_FORWARD)
 1012                 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
 1013                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1014                     ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1015                     ifp->if_index);
 1016 #endif
 1017 
 1018         /*
 1019          * Don't forward a packet with Hop limit of zero or one,
 1020          * or a packet destined to a local-only group.
 1021          */
 1022         if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
 1023             IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
 1024                 return (0);
 1025         ip6->ip6_hlim--;
 1026 
 1027         /*
 1028          * Source address check: do not forward packets with unspecified
 1029          * source. It was discussed in July 2000, on ipngwg mailing list.
 1030          * This is rather more serious than unicast cases, because some
 1031          * MLD packets can be sent with the unspecified source address
 1032          * (although such packets must normally set 1 to the hop limit field).
 1033          */
 1034         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
 1035                 ip6stat.ip6s_cantforward++;
 1036                 if (ip6_log_time + ip6_log_interval < time_second) {
 1037                         ip6_log_time = time_second;
 1038                         log(LOG_DEBUG,
 1039                             "cannot forward "
 1040                             "from %s to %s nxt %d received on %s\n",
 1041                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1042                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1043                             ip6->ip6_nxt,
 1044                             if_name(m->m_pkthdr.rcvif));
 1045                 }
 1046                 return (0);
 1047         }
 1048 
 1049         /*
 1050          * Determine forwarding mifs from the forwarding cache table
 1051          */
 1052         s = splnet();
 1053         MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
 1054 
 1055         /* Entry exists, so forward if necessary */
 1056         if (rt) {
 1057                 splx(s);
 1058                 return (ip6_mdq(m, ifp, rt));
 1059         } else {
 1060                 /*
 1061                  * If we don't have a route for packet's origin,
 1062                  * Make a copy of the packet &
 1063                  * send message to routing daemon
 1064                  */
 1065 
 1066                 struct mbuf *mb0;
 1067                 struct rtdetq *rte;
 1068                 u_long hash;
 1069 /*              int i, npkts;*/
 1070 #ifdef UPCALL_TIMING
 1071                 struct timeval tp;
 1072 
 1073                 GET_TIME(tp);
 1074 #endif /* UPCALL_TIMING */
 1075 
 1076                 mrt6stat.mrt6s_no_route++;
 1077 #ifdef MRT6DEBUG
 1078                 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
 1079                         log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
 1080                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1081                             ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1082 #endif
 1083 
 1084                 /*
 1085                  * Allocate mbufs early so that we don't do extra work if we
 1086                  * are just going to fail anyway.
 1087                  */
 1088                 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6,
 1089                                               M_NOWAIT);
 1090                 if (rte == NULL) {
 1091                         splx(s);
 1092                         return (ENOBUFS);
 1093                 }
 1094                 mb0 = m_copy(m, 0, M_COPYALL);
 1095                 /*
 1096                  * Pullup packet header if needed before storing it,
 1097                  * as other references may modify it in the meantime.
 1098                  */
 1099                 if (mb0 &&
 1100                     (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
 1101                         mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
 1102                 if (mb0 == NULL) {
 1103                         free(rte, M_MRTABLE6);
 1104                         splx(s);
 1105                         return (ENOBUFS);
 1106                 }
 1107 
 1108                 /* is there an upcall waiting for this packet? */
 1109                 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
 1110                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
 1111                         if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
 1112                                                &rt->mf6c_origin.sin6_addr) &&
 1113                             IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
 1114                                                &rt->mf6c_mcastgrp.sin6_addr) &&
 1115                             (rt->mf6c_stall != NULL))
 1116                                 break;
 1117                 }
 1118 
 1119                 if (rt == NULL) {
 1120                         struct mrt6msg *im;
 1121 #ifdef MRT6_OINIT
 1122                         struct omrt6msg *oim;
 1123 #endif
 1124 
 1125                         /* no upcall, so make a new entry */
 1126                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
 1127                                                   M_NOWAIT);
 1128                         if (rt == NULL) {
 1129                                 free(rte, M_MRTABLE6);
 1130                                 m_freem(mb0);
 1131                                 splx(s);
 1132                                 return (ENOBUFS);
 1133                         }
 1134                         /*
 1135                          * Make a copy of the header to send to the user
 1136                          * level process
 1137                          */
 1138                         mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
 1139 
 1140                         if (mm == NULL) {
 1141                                 free(rte, M_MRTABLE6);
 1142                                 m_freem(mb0);
 1143                                 free(rt, M_MRTABLE6);
 1144                                 splx(s);
 1145                                 return (ENOBUFS);
 1146                         }
 1147 
 1148                         /*
 1149                          * Send message to routing daemon
 1150                          */
 1151                         sin6.sin6_addr = ip6->ip6_src;
 1152 
 1153                         im = NULL;
 1154 #ifdef MRT6_OINIT
 1155                         oim = NULL;
 1156 #endif
 1157                         switch (ip6_mrouter_ver) {
 1158 #ifdef MRT6_OINIT
 1159                         case MRT6_OINIT:
 1160                                 oim = mtod(mm, struct omrt6msg *);
 1161                                 oim->im6_msgtype = MRT6MSG_NOCACHE;
 1162                                 oim->im6_mbz = 0;
 1163                                 break;
 1164 #endif
 1165                         case MRT6_INIT:
 1166                                 im = mtod(mm, struct mrt6msg *);
 1167                                 im->im6_msgtype = MRT6MSG_NOCACHE;
 1168                                 im->im6_mbz = 0;
 1169                                 break;
 1170                         default:
 1171                                 free(rte, M_MRTABLE6);
 1172                                 m_freem(mb0);
 1173                                 free(rt, M_MRTABLE6);
 1174                                 splx(s);
 1175                                 return (EINVAL);
 1176                         }
 1177 
 1178 #ifdef MRT6DEBUG
 1179                         if (mrt6debug & DEBUG_FORWARD)
 1180                                 log(LOG_DEBUG,
 1181                                     "getting the iif info in the kernel\n");
 1182 #endif
 1183 
 1184                         for (mifp = mif6table, mifi = 0;
 1185                              mifi < nummifs && mifp->m6_ifp != ifp;
 1186                              mifp++, mifi++)
 1187                                 ;
 1188 
 1189                         switch (ip6_mrouter_ver) {
 1190 #ifdef MRT6_OINIT
 1191                         case MRT6_OINIT:
 1192                                 oim->im6_mif = mifi;
 1193                                 break;
 1194 #endif
 1195                         case MRT6_INIT:
 1196                                 im->im6_mif = mifi;
 1197                                 break;
 1198                         }
 1199 
 1200                         if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1201                                 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
 1202                                     "socket queue full\n");
 1203                                 mrt6stat.mrt6s_upq_sockfull++;
 1204                                 free(rte, M_MRTABLE6);
 1205                                 m_freem(mb0);
 1206                                 free(rt, M_MRTABLE6);
 1207                                 splx(s);
 1208                                 return (ENOBUFS);
 1209                         }
 1210 
 1211                         mrt6stat.mrt6s_upcalls++;
 1212 
 1213                         /* insert new entry at head of hash chain */
 1214                         bzero(rt, sizeof(*rt));
 1215                         rt->mf6c_origin.sin6_family = AF_INET6;
 1216                         rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
 1217                         rt->mf6c_origin.sin6_addr = ip6->ip6_src;
 1218                         rt->mf6c_mcastgrp.sin6_family = AF_INET6;
 1219                         rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
 1220                         rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
 1221                         rt->mf6c_expire = UPCALL_EXPIRE;
 1222                         n6expire[hash]++;
 1223                         rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
 1224 
 1225                         /* link into table */
 1226                         rt->mf6c_next  = mf6ctable[hash];
 1227                         mf6ctable[hash] = rt;
 1228                         /* Add this entry to the end of the queue */
 1229                         rt->mf6c_stall = rte;
 1230                 } else {
 1231                         /* determine if q has overflowed */
 1232                         struct rtdetq **p;
 1233                         int npkts = 0;
 1234 
 1235                         for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
 1236                                 if (++npkts > MAX_UPQ6) {
 1237                                         mrt6stat.mrt6s_upq_ovflw++;
 1238                                         free(rte, M_MRTABLE6);
 1239                                         m_freem(mb0);
 1240                                         splx(s);
 1241                                         return (0);
 1242                                 }
 1243 
 1244                         /* Add this entry to the end of the queue */
 1245                         *p = rte;
 1246                 }
 1247 
 1248                 rte->next = NULL;
 1249                 rte->m = mb0;
 1250                 rte->ifp = ifp;
 1251 #ifdef UPCALL_TIMING
 1252                 rte->t = tp;
 1253 #endif /* UPCALL_TIMING */
 1254 
 1255                 splx(s);
 1256 
 1257                 return (0);
 1258         }
 1259 }
 1260 
 1261 /*
 1262  * Clean up cache entries if upcalls are not serviced
 1263  * Call from the Slow Timeout mechanism, every half second.
 1264  */
 1265 static void
 1266 expire_upcalls(void *unused)
 1267 {
 1268         struct rtdetq *rte;
 1269         struct mf6c *mfc, **nptr;
 1270         int i;
 1271         int s;
 1272 
 1273         s = splnet();
 1274         for (i = 0; i < MF6CTBLSIZ; i++) {
 1275                 if (n6expire[i] == 0)
 1276                         continue;
 1277                 nptr = &mf6ctable[i];
 1278                 while ((mfc = *nptr) != NULL) {
 1279                         rte = mfc->mf6c_stall;
 1280                         /*
 1281                          * Skip real cache entries
 1282                          * Make sure it wasn't marked to not expire (shouldn't happen)
 1283                          * If it expires now
 1284                          */
 1285                         if (rte != NULL &&
 1286                             mfc->mf6c_expire != 0 &&
 1287                             --mfc->mf6c_expire == 0) {
 1288 #ifdef MRT6DEBUG
 1289                                 if (mrt6debug & DEBUG_EXPIRE) {
 1290                                         char ip6bufo[INET6_ADDRSTRLEN];
 1291                                         char ip6bufg[INET6_ADDRSTRLEN];
 1292                                         log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
 1293                                             ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
 1294                                             ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
 1295                                 }
 1296 #endif
 1297                                 /*
 1298                                  * drop all the packets
 1299                                  * free the mbuf with the pkt, if, timing info
 1300                                  */
 1301                                 do {
 1302                                         struct rtdetq *n = rte->next;
 1303                                         m_freem(rte->m);
 1304                                         free(rte, M_MRTABLE6);
 1305                                         rte = n;
 1306                                 } while (rte != NULL);
 1307                                 mrt6stat.mrt6s_cache_cleanups++;
 1308                                 n6expire[i]--;
 1309 
 1310                                 *nptr = mfc->mf6c_next;
 1311                                 free(mfc, M_MRTABLE6);
 1312                         } else {
 1313                                 nptr = &mfc->mf6c_next;
 1314                         }
 1315                 }
 1316         }
 1317         splx(s);
 1318         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
 1319             expire_upcalls, NULL);
 1320 }
 1321 
 1322 /*
 1323  * Packet forwarding routine once entry in the cache is made
 1324  */
 1325 static int
 1326 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
 1327 {
 1328         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1329         mifi_t mifi, iif;
 1330         struct mif6 *mifp;
 1331         int plen = m->m_pkthdr.len;
 1332         struct in6_addr src0, dst0; /* copies for local work */
 1333         u_int32_t iszone, idzone, oszone, odzone;
 1334         int error = 0;
 1335 
 1336 /*
 1337  * Macro to send packet on mif.  Since RSVP packets don't get counted on
 1338  * input, they shouldn't get counted on output, so statistics keeping is
 1339  * separate.
 1340  */
 1341 
 1342 #define MC6_SEND(ip6, mifp, m) do {                             \
 1343         if ((mifp)->m6_flags & MIFF_REGISTER)                   \
 1344                 register_send((ip6), (mifp), (m));              \
 1345         else                                                    \
 1346                 phyint_send((ip6), (mifp), (m));                \
 1347 } while (/*CONSTCOND*/ 0)
 1348 
 1349         /*
 1350          * Don't forward if it didn't arrive from the parent mif
 1351          * for its origin.
 1352          */
 1353         mifi = rt->mf6c_parent;
 1354         if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
 1355                 /* came in the wrong interface */
 1356 #ifdef MRT6DEBUG
 1357                 if (mrt6debug & DEBUG_FORWARD)
 1358                         log(LOG_DEBUG,
 1359                             "wrong if: ifid %d mifi %d mififid %x\n",
 1360                             ifp->if_index, mifi,
 1361                             mif6table[mifi].m6_ifp->if_index);
 1362 #endif
 1363                 mrt6stat.mrt6s_wrong_if++;
 1364                 rt->mf6c_wrong_if++;
 1365                 /*
 1366                  * If we are doing PIM processing, and we are forwarding
 1367                  * packets on this interface, send a message to the
 1368                  * routing daemon.
 1369                  */
 1370                 /* have to make sure this is a valid mif */
 1371                 if (mifi < nummifs && mif6table[mifi].m6_ifp)
 1372                         if (pim6 && (m->m_flags & M_LOOP) == 0) {
 1373                                 /*
 1374                                  * Check the M_LOOP flag to avoid an
 1375                                  * unnecessary PIM assert.
 1376                                  * XXX: M_LOOP is an ad-hoc hack...
 1377                                  */
 1378                                 static struct sockaddr_in6 sin6 =
 1379                                 { sizeof(sin6), AF_INET6 };
 1380 
 1381                                 struct mbuf *mm;
 1382                                 struct mrt6msg *im;
 1383 #ifdef MRT6_OINIT
 1384                                 struct omrt6msg *oim;
 1385 #endif
 1386 
 1387                                 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
 1388                                 if (mm &&
 1389                                     (M_HASCL(mm) ||
 1390                                      mm->m_len < sizeof(struct ip6_hdr)))
 1391                                         mm = m_pullup(mm, sizeof(struct ip6_hdr));
 1392                                 if (mm == NULL)
 1393                                         return (ENOBUFS);
 1394 
 1395 #ifdef MRT6_OINIT
 1396                                 oim = NULL;
 1397 #endif
 1398                                 im = NULL;
 1399                                 switch (ip6_mrouter_ver) {
 1400 #ifdef MRT6_OINIT
 1401                                 case MRT6_OINIT:
 1402                                         oim = mtod(mm, struct omrt6msg *);
 1403                                         oim->im6_msgtype = MRT6MSG_WRONGMIF;
 1404                                         oim->im6_mbz = 0;
 1405                                         break;
 1406 #endif
 1407                                 case MRT6_INIT:
 1408                                         im = mtod(mm, struct mrt6msg *);
 1409                                         im->im6_msgtype = MRT6MSG_WRONGMIF;
 1410                                         im->im6_mbz = 0;
 1411                                         break;
 1412                                 default:
 1413                                         m_freem(mm);
 1414                                         return (EINVAL);
 1415                                 }
 1416 
 1417                                 for (mifp = mif6table, iif = 0;
 1418                                      iif < nummifs && mifp &&
 1419                                              mifp->m6_ifp != ifp;
 1420                                      mifp++, iif++)
 1421                                         ;
 1422 
 1423                                 switch (ip6_mrouter_ver) {
 1424 #ifdef MRT6_OINIT
 1425                                 case MRT6_OINIT:
 1426                                         oim->im6_mif = iif;
 1427                                         sin6.sin6_addr = oim->im6_src;
 1428                                         break;
 1429 #endif
 1430                                 case MRT6_INIT:
 1431                                         im->im6_mif = iif;
 1432                                         sin6.sin6_addr = im->im6_src;
 1433                                         break;
 1434                                 }
 1435 
 1436                                 mrt6stat.mrt6s_upcalls++;
 1437 
 1438                                 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1439 #ifdef MRT6DEBUG
 1440                                         if (mrt6debug)
 1441                                                 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
 1442 #endif
 1443                                         ++mrt6stat.mrt6s_upq_sockfull;
 1444                                         return (ENOBUFS);
 1445                                 }       /* if socket Q full */
 1446                         }               /* if PIM */
 1447                 return (0);
 1448         }                       /* if wrong iif */
 1449 
 1450         /* If I sourced this packet, it counts as output, else it was input. */
 1451         if (m->m_pkthdr.rcvif == NULL) {
 1452                 /* XXX: is rcvif really NULL when output?? */
 1453                 mif6table[mifi].m6_pkt_out++;
 1454                 mif6table[mifi].m6_bytes_out += plen;
 1455         } else {
 1456                 mif6table[mifi].m6_pkt_in++;
 1457                 mif6table[mifi].m6_bytes_in += plen;
 1458         }
 1459         rt->mf6c_pkt_cnt++;
 1460         rt->mf6c_byte_cnt += plen;
 1461 
 1462         /*
 1463          * For each mif, forward a copy of the packet if there are group
 1464          * members downstream on the interface.
 1465          */
 1466         src0 = ip6->ip6_src;
 1467         dst0 = ip6->ip6_dst;
 1468         if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
 1469             (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
 1470                 ip6stat.ip6s_badscope++;
 1471                 return (error);
 1472         }
 1473         for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
 1474                 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
 1475                         /*
 1476                          * check if the outgoing packet is going to break
 1477                          * a scope boundary.
 1478                          * XXX For packets through PIM register tunnel
 1479                          * interface, we believe a routing daemon.
 1480                          */
 1481                         if (!(mif6table[rt->mf6c_parent].m6_flags &
 1482                               MIFF_REGISTER) &&
 1483                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
 1484                                 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
 1485                                     &oszone) ||
 1486                                     in6_setscope(&dst0, mif6table[mifi].m6_ifp,
 1487                                     &odzone) ||
 1488                                     iszone != oszone ||
 1489                                     idzone != odzone) {
 1490                                         ip6stat.ip6s_badscope++;
 1491                                         continue;
 1492                                 }
 1493                         }
 1494 
 1495                         mifp->m6_pkt_out++;
 1496                         mifp->m6_bytes_out += plen;
 1497                         MC6_SEND(ip6, mifp, m);
 1498                 }
 1499         }
 1500         return (0);
 1501 }
 1502 
 1503 static void
 1504 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
 1505 {
 1506         struct mbuf *mb_copy;
 1507         struct ifnet *ifp = mifp->m6_ifp;
 1508         int error = 0;
 1509         int s = splnet();       /* needs to protect static "ro" below. */
 1510         static struct route_in6 ro;
 1511         struct  in6_multi *in6m;
 1512         struct sockaddr_in6 *dst6;
 1513         u_long linkmtu;
 1514 
 1515         /*
 1516          * Make a new reference to the packet; make sure that
 1517          * the IPv6 header is actually copied, not just referenced,
 1518          * so that ip6_output() only scribbles on the copy.
 1519          */
 1520         mb_copy = m_copy(m, 0, M_COPYALL);
 1521         if (mb_copy &&
 1522             (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
 1523                 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
 1524         if (mb_copy == NULL) {
 1525                 splx(s);
 1526                 return;
 1527         }
 1528         /* set MCAST flag to the outgoing packet */
 1529         mb_copy->m_flags |= M_MCAST;
 1530 
 1531         /*
 1532          * If we sourced the packet, call ip6_output since we may devide
 1533          * the packet into fragments when the packet is too big for the
 1534          * outgoing interface.
 1535          * Otherwise, we can simply send the packet to the interface
 1536          * sending queue.
 1537          */
 1538         if (m->m_pkthdr.rcvif == NULL) {
 1539                 struct ip6_moptions im6o;
 1540 
 1541                 im6o.im6o_multicast_ifp = ifp;
 1542                 /* XXX: ip6_output will override ip6->ip6_hlim */
 1543                 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
 1544                 im6o.im6o_multicast_loop = 1;
 1545                 error = ip6_output(mb_copy, NULL, &ro,
 1546                                    IPV6_FORWARDING, &im6o, NULL, NULL);
 1547 
 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                 splx(s);
 1554                 return;
 1555         }
 1556 
 1557         /*
 1558          * If we belong to the destination multicast group
 1559          * on the outgoing interface, loop back a copy.
 1560          */
 1561         dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
 1562         IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
 1563         if (in6m != NULL) {
 1564                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1565                 dst6->sin6_family = AF_INET6;
 1566                 dst6->sin6_addr = ip6->ip6_dst;
 1567                 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
 1568         }
 1569         /*
 1570          * Put the packet into the sending queue of the outgoing interface
 1571          * if it would fit in the MTU of the interface.
 1572          */
 1573         linkmtu = IN6_LINKMTU(ifp);
 1574         if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
 1575                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1576                 dst6->sin6_family = AF_INET6;
 1577                 dst6->sin6_addr = ip6->ip6_dst;
 1578                 /*
 1579                  * We just call if_output instead of nd6_output here, since
 1580                  * we need no ND for a multicast forwarded packet...right?
 1581                  */
 1582                 error = (*ifp->if_output)(ifp, mb_copy,
 1583                     (struct sockaddr *)&ro.ro_dst, NULL);
 1584 #ifdef MRT6DEBUG
 1585                 if (mrt6debug & DEBUG_XMIT)
 1586                         log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
 1587                             mifp - mif6table, error);
 1588 #endif
 1589         } else {
 1590                 /*
 1591                  * pMTU discovery is intentionally disabled by default, since
 1592                  * various router may notify pMTU in multicast, which can be
 1593                  * a DDoS to a router
 1594                  */
 1595                 if (ip6_mcast_pmtu)
 1596                         icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
 1597                 else {
 1598 #ifdef MRT6DEBUG
 1599                         if (mrt6debug & DEBUG_XMIT) {
 1600                                 char ip6bufs[INET6_ADDRSTRLEN];
 1601                                 char ip6bufd[INET6_ADDRSTRLEN];
 1602                                 log(LOG_DEBUG,
 1603                                     "phyint_send: packet too big on %s o %s "
 1604                                     "g %s size %d(discarded)\n",
 1605                                     if_name(ifp),
 1606                                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1607                                     ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1608                                     mb_copy->m_pkthdr.len);
 1609                         }
 1610 #endif /* MRT6DEBUG */
 1611                         m_freem(mb_copy); /* simply discard the packet */
 1612                 }
 1613         }
 1614 
 1615         splx(s);
 1616 }
 1617 
 1618 static int
 1619 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
 1620 {
 1621         struct mbuf *mm;
 1622         int i, len = m->m_pkthdr.len;
 1623         static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
 1624         struct mrt6msg *im6;
 1625 
 1626 #ifdef MRT6DEBUG
 1627         if (mrt6debug) {
 1628                 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1629                 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
 1630                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1631                     ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1632         }
 1633 #endif
 1634         ++pim6stat.pim6s_snd_registers;
 1635 
 1636         /* Make a copy of the packet to send to the user level process */
 1637         MGETHDR(mm, M_DONTWAIT, MT_HEADER);
 1638         if (mm == NULL)
 1639                 return (ENOBUFS);
 1640         mm->m_pkthdr.rcvif = NULL;
 1641         mm->m_data += max_linkhdr;
 1642         mm->m_len = sizeof(struct ip6_hdr);
 1643 
 1644         if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
 1645                 m_freem(mm);
 1646                 return (ENOBUFS);
 1647         }
 1648         i = MHLEN - M_LEADINGSPACE(mm);
 1649         if (i > len)
 1650                 i = len;
 1651         mm = m_pullup(mm, i);
 1652         if (mm == NULL)
 1653                 return (ENOBUFS);
 1654 /* TODO: check it! */
 1655         mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
 1656 
 1657         /*
 1658          * Send message to routing daemon
 1659          */
 1660         sin6.sin6_addr = ip6->ip6_src;
 1661 
 1662         im6 = mtod(mm, struct mrt6msg *);
 1663         im6->im6_msgtype      = MRT6MSG_WHOLEPKT;
 1664         im6->im6_mbz          = 0;
 1665 
 1666         im6->im6_mif = mif - mif6table;
 1667 
 1668         /* iif info is not given for reg. encap.n */
 1669         mrt6stat.mrt6s_upcalls++;
 1670 
 1671         if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1672 #ifdef MRT6DEBUG
 1673                 if (mrt6debug)
 1674                         log(LOG_WARNING,
 1675                             "register_send: ip6_mrouter socket queue full\n");
 1676 #endif
 1677                 ++mrt6stat.mrt6s_upq_sockfull;
 1678                 return (ENOBUFS);
 1679         }
 1680         return (0);
 1681 }
 1682 
 1683 /*
 1684  * PIM sparse mode hook
 1685  * Receives the pim control messages, and passes them up to the listening
 1686  * socket, using rip6_input.
 1687  * The only message processed is the REGISTER pim message; the pim header
 1688  * is stripped off, and the inner packet is passed to register_mforward.
 1689  */
 1690 int
 1691 pim6_input(struct mbuf **mp, int *offp, int proto)
 1692 {
 1693         struct pim *pim; /* pointer to a pim struct */
 1694         struct ip6_hdr *ip6;
 1695         int pimlen;
 1696         struct mbuf *m = *mp;
 1697         int minlen;
 1698         int off = *offp;
 1699 
 1700         ++pim6stat.pim6s_rcv_total;
 1701 
 1702         ip6 = mtod(m, struct ip6_hdr *);
 1703         pimlen = m->m_pkthdr.len - *offp;
 1704 
 1705         /*
 1706          * Validate lengths
 1707          */
 1708         if (pimlen < PIM_MINLEN) {
 1709                 ++pim6stat.pim6s_rcv_tooshort;
 1710 #ifdef MRT6DEBUG
 1711                 if (mrt6debug & DEBUG_PIM)
 1712                         log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
 1713 #endif
 1714                 m_freem(m);
 1715                 return (IPPROTO_DONE);
 1716         }
 1717 
 1718         /*
 1719          * if the packet is at least as big as a REGISTER, go ahead
 1720          * and grab the PIM REGISTER header size, to avoid another
 1721          * possible m_pullup() later.
 1722          *
 1723          * PIM_MINLEN       == pimhdr + u_int32 == 8
 1724          * PIM6_REG_MINLEN   == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
 1725          */
 1726         minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
 1727 
 1728         /*
 1729          * Make sure that the IP6 and PIM headers in contiguous memory, and
 1730          * possibly the PIM REGISTER header
 1731          */
 1732 #ifndef PULLDOWN_TEST
 1733         IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
 1734         /* adjust pointer */
 1735         ip6 = mtod(m, struct ip6_hdr *);
 1736 
 1737         /* adjust mbuf to point to the PIM header */
 1738         pim = (struct pim *)((caddr_t)ip6 + off);
 1739 #else
 1740         IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
 1741         if (pim == NULL) {
 1742                 pim6stat.pim6s_rcv_tooshort++;
 1743                 return (IPPROTO_DONE);
 1744         }
 1745 #endif
 1746 
 1747 #define PIM6_CHECKSUM
 1748 #ifdef PIM6_CHECKSUM
 1749         {
 1750                 int cksumlen;
 1751 
 1752                 /*
 1753                  * Validate checksum.
 1754                  * If PIM REGISTER, exclude the data packet
 1755                  */
 1756                 if (pim->pim_type == PIM_REGISTER)
 1757                         cksumlen = PIM_MINLEN;
 1758                 else
 1759                         cksumlen = pimlen;
 1760 
 1761                 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
 1762                         ++pim6stat.pim6s_rcv_badsum;
 1763 #ifdef MRT6DEBUG
 1764                         if (mrt6debug & DEBUG_PIM)
 1765                                 log(LOG_DEBUG,
 1766                                     "pim6_input: invalid checksum\n");
 1767 #endif
 1768                         m_freem(m);
 1769                         return (IPPROTO_DONE);
 1770                 }
 1771         }
 1772 #endif /* PIM_CHECKSUM */
 1773 
 1774         /* PIM version check */
 1775         if (pim->pim_ver != PIM_VERSION) {
 1776                 ++pim6stat.pim6s_rcv_badversion;
 1777 #ifdef MRT6DEBUG
 1778                 log(LOG_ERR,
 1779                     "pim6_input: incorrect version %d, expecting %d\n",
 1780                     pim->pim_ver, PIM_VERSION);
 1781 #endif
 1782                 m_freem(m);
 1783                 return (IPPROTO_DONE);
 1784         }
 1785 
 1786         if (pim->pim_type == PIM_REGISTER) {
 1787                 /*
 1788                  * since this is a REGISTER, we'll make a copy of the register
 1789                  * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
 1790                  * routing daemon.
 1791                  */
 1792                 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
 1793 
 1794                 struct mbuf *mcp;
 1795                 struct ip6_hdr *eip6;
 1796                 u_int32_t *reghdr;
 1797                 int rc;
 1798 #ifdef MRT6DEBUG
 1799                 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1800 #endif
 1801 
 1802                 ++pim6stat.pim6s_rcv_registers;
 1803 
 1804                 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
 1805 #ifdef MRT6DEBUG
 1806                         if (mrt6debug & DEBUG_PIM)
 1807                                 log(LOG_DEBUG,
 1808                                     "pim6_input: register mif not set: %d\n",
 1809                                     reg_mif_num);
 1810 #endif
 1811                         m_freem(m);
 1812                         return (IPPROTO_DONE);
 1813                 }
 1814 
 1815                 reghdr = (u_int32_t *)(pim + 1);
 1816 
 1817                 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
 1818                         goto pim6_input_to_daemon;
 1819 
 1820                 /*
 1821                  * Validate length
 1822                  */
 1823                 if (pimlen < PIM6_REG_MINLEN) {
 1824                         ++pim6stat.pim6s_rcv_tooshort;
 1825                         ++pim6stat.pim6s_rcv_badregisters;
 1826 #ifdef MRT6DEBUG
 1827                         log(LOG_ERR,
 1828                             "pim6_input: register packet size too "
 1829                             "small %d from %s\n",
 1830                             pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
 1831 #endif
 1832                         m_freem(m);
 1833                         return (IPPROTO_DONE);
 1834                 }
 1835 
 1836                 eip6 = (struct ip6_hdr *) (reghdr + 1);
 1837 #ifdef MRT6DEBUG
 1838                 if (mrt6debug & DEBUG_PIM)
 1839                         log(LOG_DEBUG,
 1840                             "pim6_input[register], eip6: %s -> %s, "
 1841                             "eip6 plen %d\n",
 1842                             ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1843                             ip6_sprintf(ip6bufd, &eip6->ip6_dst),
 1844                             ntohs(eip6->ip6_plen));
 1845 #endif
 1846 
 1847                 /* verify the version number of the inner packet */
 1848                 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
 1849                         ++pim6stat.pim6s_rcv_badregisters;
 1850 #ifdef MRT6DEBUG
 1851                         log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
 1852                             "of the inner packet\n",
 1853                             (eip6->ip6_vfc & IPV6_VERSION));
 1854 #endif
 1855                         m_freem(m);
 1856                         return (IPPROTO_NONE);
 1857                 }
 1858 
 1859                 /* verify the inner packet is destined to a mcast group */
 1860                 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
 1861                         ++pim6stat.pim6s_rcv_badregisters;
 1862 #ifdef MRT6DEBUG
 1863                         if (mrt6debug & DEBUG_PIM)
 1864                                 log(LOG_DEBUG,
 1865                                     "pim6_input: inner packet of register "
 1866                                     "is not multicast %s\n",
 1867                                     ip6_sprintf(ip6bufd, &eip6->ip6_dst));
 1868 #endif
 1869                         m_freem(m);
 1870                         return (IPPROTO_DONE);
 1871                 }
 1872 
 1873                 /*
 1874                  * make a copy of the whole header to pass to the daemon later.
 1875                  */
 1876                 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
 1877                 if (mcp == NULL) {
 1878 #ifdef MRT6DEBUG
 1879                         log(LOG_ERR,
 1880                             "pim6_input: pim register: "
 1881                             "could not copy register head\n");
 1882 #endif
 1883                         m_freem(m);
 1884                         return (IPPROTO_DONE);
 1885                 }
 1886 
 1887                 /*
 1888                  * forward the inner ip6 packet; point m_data at the inner ip6.
 1889                  */
 1890                 m_adj(m, off + PIM_MINLEN);
 1891 #ifdef MRT6DEBUG
 1892                 if (mrt6debug & DEBUG_PIM) {
 1893                         log(LOG_DEBUG,
 1894                             "pim6_input: forwarding decapsulated register: "
 1895                             "src %s, dst %s, mif %d\n",
 1896                             ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1897                             ip6_sprintf(ip6bufd, &eip6->ip6_dst),
 1898                             reg_mif_num);
 1899                 }
 1900 #endif
 1901 
 1902                 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
 1903                                 dst.sin6_family, 0);
 1904 
 1905                 /* prepare the register head to send to the mrouting daemon */
 1906                 m = mcp;
 1907         }
 1908 
 1909         /*
 1910          * Pass the PIM message up to the daemon; if it is a register message
 1911          * pass the 'head' only up to the daemon. This includes the
 1912          * encapsulator ip6 header, pim header, register header and the
 1913          * encapsulated ip6 header.
 1914          */
 1915   pim6_input_to_daemon:
 1916         rip6_input(&m, offp, proto);
 1917         return (IPPROTO_DONE);
 1918 }

Cache object: 47d2844d36e582e98973b27a37cba62f


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