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

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    1 /*-
    2  * Copyright (C) 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
   30  */
   31 
   32 /*-
   33  * Copyright (c) 1989 Stephen Deering
   34  * Copyright (c) 1992, 1993
   35  *      The Regents of the University of California.  All rights reserved.
   36  *
   37  * This code is derived from software contributed to Berkeley by
   38  * Stephen Deering of Stanford University.
   39  *
   40  * Redistribution and use in source and binary forms, with or without
   41  * modification, are permitted provided that the following conditions
   42  * are met:
   43  * 1. Redistributions of source code must retain the above copyright
   44  *    notice, this list of conditions and the following disclaimer.
   45  * 2. Redistributions in binary form must reproduce the above copyright
   46  *    notice, this list of conditions and the following disclaimer in the
   47  *    documentation and/or other materials provided with the distribution.
   48  * 4. Neither the name of the University nor the names of its contributors
   49  *    may be used to endorse or promote products derived from this software
   50  *    without specific prior written permission.
   51  *
   52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   62  * SUCH DAMAGE.
   63  *
   64  *      @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
   65  *      BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp
   66  */
   67 
   68 /*
   69  * IP multicast forwarding procedures
   70  *
   71  * Written by David Waitzman, BBN Labs, August 1988.
   72  * Modified by Steve Deering, Stanford, February 1989.
   73  * Modified by Mark J. Steiglitz, Stanford, May, 1991
   74  * Modified by Van Jacobson, LBL, January 1993
   75  * Modified by Ajit Thyagarajan, PARC, August 1993
   76  * Modified by Bill Fenner, PARC, April 1994
   77  *
   78  * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
   79  */
   80 
   81 #include <sys/cdefs.h>
   82 __FBSDID("$FreeBSD: releng/8.3/sys/netinet6/ip6_mroute.c 207695 2010-05-06 06:44:19Z bz $");
   83 
   84 #include "opt_inet.h"
   85 #include "opt_inet6.h"
   86 
   87 #include <sys/param.h>
   88 #include <sys/callout.h>
   89 #include <sys/errno.h>
   90 #include <sys/kernel.h>
   91 #include <sys/lock.h>
   92 #include <sys/malloc.h>
   93 #include <sys/mbuf.h>
   94 #include <sys/module.h>
   95 #include <sys/domain.h>
   96 #include <sys/protosw.h>
   97 #include <sys/signalvar.h>
   98 #include <sys/socket.h>
   99 #include <sys/socketvar.h>
  100 #include <sys/sockio.h>
  101 #include <sys/sx.h>
  102 #include <sys/sysctl.h>
  103 #include <sys/syslog.h>
  104 #include <sys/systm.h>
  105 #include <sys/time.h>
  106 
  107 #include <net/if.h>
  108 #include <net/if_types.h>
  109 #include <net/raw_cb.h>
  110 #include <net/vnet.h>
  111 
  112 #include <netinet/in.h>
  113 #include <netinet/in_var.h>
  114 #include <netinet/icmp6.h>
  115 #include <netinet/ip_encap.h>
  116 
  117 #include <netinet/ip6.h>
  118 #include <netinet6/ip6_var.h>
  119 #include <netinet6/scope6_var.h>
  120 #include <netinet6/nd6.h>
  121 #include <netinet6/ip6_mroute.h>
  122 #include <netinet6/ip6protosw.h>
  123 #include <netinet6/pim6.h>
  124 #include <netinet6/pim6_var.h>
  125 
  126 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
  127 
  128 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
  129 #define M_HASCL(m) ((m)->m_flags & M_EXT)
  130 
  131 static int      ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
  132 static void     phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
  133 static int      register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
  134 static int      set_pim6(int *);
  135 static int      socket_send(struct socket *, struct mbuf *,
  136                     struct sockaddr_in6 *);
  137 
  138 extern int in6_mcast_loop;
  139 extern struct domain inet6domain;
  140 
  141 static const struct encaptab *pim6_encap_cookie;
  142 static const struct ip6protosw in6_pim_protosw = {
  143         .pr_type =              SOCK_RAW,
  144         .pr_domain =            &inet6domain,
  145         .pr_protocol =          IPPROTO_PIM,
  146         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  147         .pr_input =             pim6_input,
  148         .pr_output =            rip6_output,
  149         .pr_ctloutput =         rip6_ctloutput,
  150         .pr_usrreqs =           &rip6_usrreqs
  151 };
  152 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
  153 
  154 static VNET_DEFINE(int, ip6_mrouter_ver) = 0;
  155 #define V_ip6_mrouter_ver       VNET(ip6_mrouter_ver)
  156 
  157 SYSCTL_DECL(_net_inet6);
  158 SYSCTL_DECL(_net_inet6_ip6);
  159 SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
  160 
  161 static struct mrt6stat mrt6stat;
  162 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
  163     &mrt6stat, mrt6stat,
  164     "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
  165 
  166 #define NO_RTE_FOUND    0x1
  167 #define RTE_FOUND       0x2
  168 
  169 static struct mtx mrouter6_mtx;
  170 #define MROUTER6_LOCK()         mtx_lock(&mrouter6_mtx)
  171 #define MROUTER6_UNLOCK()       mtx_unlock(&mrouter6_mtx)
  172 #define MROUTER6_LOCK_ASSERT()  do {                                    \
  173         mtx_assert(&mrouter6_mtx, MA_OWNED);                            \
  174         NET_ASSERT_GIANT();                                             \
  175 } while (0)
  176 #define MROUTER6_LOCK_INIT()    \
  177         mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
  178 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
  179 
  180 static struct mf6c *mf6ctable[MF6CTBLSIZ];
  181 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
  182     &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
  183     "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
  184     "netinet6/ip6_mroute.h)");
  185 
  186 static struct mtx mfc6_mtx;
  187 #define MFC6_LOCK()             mtx_lock(&mfc6_mtx)
  188 #define MFC6_UNLOCK()           mtx_unlock(&mfc6_mtx)
  189 #define MFC6_LOCK_ASSERT()      do {                                    \
  190         mtx_assert(&mfc6_mtx, MA_OWNED);                                \
  191         NET_ASSERT_GIANT();                                             \
  192 } while (0)
  193 #define MFC6_LOCK_INIT()                \
  194         mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
  195 #define MFC6_LOCK_DESTROY()     mtx_destroy(&mfc6_mtx)
  196 
  197 static u_char n6expire[MF6CTBLSIZ];
  198 
  199 static struct mif6 mif6table[MAXMIFS];
  200 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
  201     &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]",
  202     "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)");
  203 
  204 static struct mtx mif6_mtx;
  205 #define MIF6_LOCK()             mtx_lock(&mif6_mtx)
  206 #define MIF6_UNLOCK()           mtx_unlock(&mif6_mtx)
  207 #define MIF6_LOCK_ASSERT()      mtx_assert(&mif6_mtx, MA_OWNED)
  208 #define MIF6_LOCK_INIT()        \
  209         mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
  210 #define MIF6_LOCK_DESTROY()     mtx_destroy(&mif6_mtx)
  211 
  212 #ifdef MRT6DEBUG
  213 static VNET_DEFINE(u_int, mrt6debug) = 0;       /* debug level */
  214 #define V_mrt6debug             VNET(mrt6debug)
  215 #define DEBUG_MFC       0x02
  216 #define DEBUG_FORWARD   0x04
  217 #define DEBUG_EXPIRE    0x08
  218 #define DEBUG_XMIT      0x10
  219 #define DEBUG_REG       0x20
  220 #define DEBUG_PIM       0x40
  221 #endif
  222 
  223 static void     expire_upcalls(void *);
  224 #define EXPIRE_TIMEOUT  (hz / 4)        /* 4x / second */
  225 #define UPCALL_EXPIRE   6               /* number of timeouts */
  226 
  227 /*
  228  * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
  229  */
  230 
  231 /*
  232  * 'Interfaces' associated with decapsulator (so we can tell
  233  * packets that went through it from ones that get reflected
  234  * by a broken gateway).  Different from IPv4 register_if,
  235  * these interfaces are linked into the system ifnet list,
  236  * because per-interface IPv6 statistics are maintained in
  237  * ifp->if_afdata.  But it does not have any routes point
  238  * to them.  I.e., packets can't be sent this way.  They
  239  * only exist as a placeholder for multicast source
  240  * verification.
  241  */
  242 static struct ifnet *multicast_register_if6;
  243 
  244 #define ENCAP_HOPS 64
  245 
  246 /*
  247  * Private variables.
  248  */
  249 static mifi_t nummifs = 0;
  250 static mifi_t reg_mif_num = (mifi_t)-1;
  251 
  252 static struct pim6stat pim6stat;
  253 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD,
  254     &pim6stat, pim6stat,
  255     "PIM Statistics (struct pim6stat, netinet6/pim_var.h)");
  256 
  257 static VNET_DEFINE(int, pim6);
  258 #define V_pim6          VNET(pim6)
  259 
  260 /*
  261  * Hash function for a source, group entry
  262  */
  263 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
  264                                    (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
  265                                    (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
  266                                    (g).s6_addr32[2] ^ (g).s6_addr32[3])
  267 
  268 /*
  269  * Find a route for a given origin IPv6 address and Multicast group address.
  270  */
  271 #define MF6CFIND(o, g, rt) do { \
  272         struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
  273         rt = NULL; \
  274         mrt6stat.mrt6s_mfc_lookups++; \
  275         while (_rt) { \
  276                 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
  277                     IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
  278                     (_rt->mf6c_stall == NULL)) { \
  279                         rt = _rt; \
  280                         break; \
  281                 } \
  282                 _rt = _rt->mf6c_next; \
  283         } \
  284         if (rt == NULL) { \
  285                 mrt6stat.mrt6s_mfc_misses++; \
  286         } \
  287 } while (/*CONSTCOND*/ 0)
  288 
  289 /*
  290  * Macros to compute elapsed time efficiently
  291  * Borrowed from Van Jacobson's scheduling code
  292  * XXX: replace with timersub() ?
  293  */
  294 #define TV_DELTA(a, b, delta) do { \
  295             int xxs; \
  296                 \
  297             delta = (a).tv_usec - (b).tv_usec; \
  298             if ((xxs = (a).tv_sec - (b).tv_sec)) { \
  299                switch (xxs) { \
  300                       case 2: \
  301                           delta += 1000000; \
  302                               /* FALLTHROUGH */ \
  303                       case 1: \
  304                           delta += 1000000; \
  305                           break; \
  306                       default: \
  307                           delta += (1000000 * xxs); \
  308                } \
  309             } \
  310 } while (/*CONSTCOND*/ 0)
  311 
  312 /* XXX: replace with timercmp(a, b, <) ? */
  313 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
  314               (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
  315 
  316 #ifdef UPCALL_TIMING
  317 #define UPCALL_MAX      50
  318 static u_long upcall_data[UPCALL_MAX + 1];
  319 static void collate();
  320 #endif /* UPCALL_TIMING */
  321 
  322 static int ip6_mrouter_init(struct socket *, int, int);
  323 static int add_m6fc(struct mf6cctl *);
  324 static int add_m6if(struct mif6ctl *);
  325 static int del_m6fc(struct mf6cctl *);
  326 static int del_m6if(mifi_t *);
  327 static int del_m6if_locked(mifi_t *);
  328 static int get_mif6_cnt(struct sioc_mif_req6 *);
  329 static int get_sg_cnt(struct sioc_sg_req6 *);
  330 
  331 static struct callout expire_upcalls_ch;
  332 
  333 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
  334 int X_ip6_mrouter_done(void);
  335 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
  336 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
  337 int X_mrt6_ioctl(u_long, caddr_t);
  338 
  339 /*
  340  * Handle MRT setsockopt commands to modify the multicast routing tables.
  341  */
  342 int
  343 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
  344 {
  345         int error = 0;
  346         int optval;
  347         struct mif6ctl mifc;
  348         struct mf6cctl mfcc;
  349         mifi_t mifi;
  350 
  351         if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
  352                 return (EACCES);
  353 
  354         switch (sopt->sopt_name) {
  355         case MRT6_INIT:
  356 #ifdef MRT6_OINIT
  357         case MRT6_OINIT:
  358 #endif
  359                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  360                     sizeof(optval));
  361                 if (error)
  362                         break;
  363                 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
  364                 break;
  365         case MRT6_DONE:
  366                 error = X_ip6_mrouter_done();
  367                 break;
  368         case MRT6_ADD_MIF:
  369                 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
  370                 if (error)
  371                         break;
  372                 error = add_m6if(&mifc);
  373                 break;
  374         case MRT6_ADD_MFC:
  375                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  376                 if (error)
  377                         break;
  378                 error = add_m6fc(&mfcc);
  379                 break;
  380         case MRT6_DEL_MFC:
  381                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  382                 if (error)
  383                         break;
  384                 error = del_m6fc(&mfcc);
  385                 break;
  386         case MRT6_DEL_MIF:
  387                 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
  388                 if (error)
  389                         break;
  390                 error = del_m6if(&mifi);
  391                 break;
  392         case MRT6_PIM:
  393                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  394                     sizeof(optval));
  395                 if (error)
  396                         break;
  397                 error = set_pim6(&optval);
  398                 break;
  399         default:
  400                 error = EOPNOTSUPP;
  401                 break;
  402         }
  403 
  404         return (error);
  405 }
  406 
  407 /*
  408  * Handle MRT getsockopt commands
  409  */
  410 int
  411 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
  412 {
  413         int error = 0;
  414 
  415         if (so != V_ip6_mrouter)
  416                 return (EACCES);
  417 
  418         switch (sopt->sopt_name) {
  419                 case MRT6_PIM:
  420                         error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
  421                         break;
  422         }
  423         return (error);
  424 }
  425 
  426 /*
  427  * Handle ioctl commands to obtain information from the cache
  428  */
  429 int
  430 X_mrt6_ioctl(u_long cmd, caddr_t data)
  431 {
  432         int ret;
  433 
  434         ret = EINVAL;
  435 
  436         switch (cmd) {
  437         case SIOCGETSGCNT_IN6:
  438                 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
  439                 break;
  440 
  441         case SIOCGETMIFCNT_IN6:
  442                 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
  443                 break;
  444 
  445         default:
  446                 break;
  447         }
  448 
  449         return (ret);
  450 }
  451 
  452 /*
  453  * returns the packet, byte, rpf-failure count for the source group provided
  454  */
  455 static int
  456 get_sg_cnt(struct sioc_sg_req6 *req)
  457 {
  458         struct mf6c *rt;
  459         int ret;
  460 
  461         ret = 0;
  462 
  463         MFC6_LOCK();
  464 
  465         MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
  466         if (rt == NULL) {
  467                 ret = ESRCH;
  468         } else {
  469                 req->pktcnt = rt->mf6c_pkt_cnt;
  470                 req->bytecnt = rt->mf6c_byte_cnt;
  471                 req->wrong_if = rt->mf6c_wrong_if;
  472         }
  473 
  474         MFC6_UNLOCK();
  475 
  476         return (ret);
  477 }
  478 
  479 /*
  480  * returns the input and output packet and byte counts on the mif provided
  481  */
  482 static int
  483 get_mif6_cnt(struct sioc_mif_req6 *req)
  484 {
  485         mifi_t mifi;
  486         int ret;
  487 
  488         ret = 0;
  489         mifi = req->mifi;
  490 
  491         MIF6_LOCK();
  492 
  493         if (mifi >= nummifs) {
  494                 ret = EINVAL;
  495         } else {
  496                 req->icount = mif6table[mifi].m6_pkt_in;
  497                 req->ocount = mif6table[mifi].m6_pkt_out;
  498                 req->ibytes = mif6table[mifi].m6_bytes_in;
  499                 req->obytes = mif6table[mifi].m6_bytes_out;
  500         }
  501 
  502         MIF6_UNLOCK();
  503 
  504         return (ret);
  505 }
  506 
  507 static int
  508 set_pim6(int *i)
  509 {
  510         if ((*i != 1) && (*i != 0))
  511                 return (EINVAL);
  512 
  513         V_pim6 = *i;
  514 
  515         return (0);
  516 }
  517 
  518 /*
  519  * Enable multicast routing
  520  */
  521 static int
  522 ip6_mrouter_init(struct socket *so, int v, int cmd)
  523 {
  524 
  525 #ifdef MRT6DEBUG
  526         if (V_mrt6debug)
  527                 log(LOG_DEBUG,
  528                     "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
  529                     so->so_type, so->so_proto->pr_protocol);
  530 #endif
  531 
  532         if (so->so_type != SOCK_RAW ||
  533             so->so_proto->pr_protocol != IPPROTO_ICMPV6)
  534                 return (EOPNOTSUPP);
  535 
  536         if (v != 1)
  537                 return (ENOPROTOOPT);
  538 
  539         MROUTER6_LOCK();
  540 
  541         if (V_ip6_mrouter != NULL) {
  542                 MROUTER6_UNLOCK();
  543                 return (EADDRINUSE);
  544         }
  545 
  546         V_ip6_mrouter = so;
  547         V_ip6_mrouter_ver = cmd;
  548 
  549         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  550         bzero((caddr_t)n6expire, sizeof(n6expire));
  551 
  552         V_pim6 = 0;/* used for stubbing out/in pim stuff */
  553 
  554         callout_init(&expire_upcalls_ch, 0);
  555         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
  556             expire_upcalls, NULL);
  557 
  558         MROUTER6_UNLOCK();
  559 
  560 #ifdef MRT6DEBUG
  561         if (V_mrt6debug)
  562                 log(LOG_DEBUG, "ip6_mrouter_init\n");
  563 #endif
  564 
  565         return (0);
  566 }
  567 
  568 /*
  569  * Disable IPv6 multicast forwarding.
  570  */
  571 int
  572 X_ip6_mrouter_done(void)
  573 {
  574         mifi_t mifi;
  575         int i;
  576         struct mf6c *rt;
  577         struct rtdetq *rte;
  578 
  579         MROUTER6_LOCK();
  580 
  581         if (V_ip6_mrouter == NULL) {
  582                 MROUTER6_UNLOCK();
  583                 return (EINVAL);
  584         }
  585 
  586         /*
  587          * For each phyint in use, disable promiscuous reception of all IPv6
  588          * multicasts.
  589          */
  590         for (mifi = 0; mifi < nummifs; mifi++) {
  591                 if (mif6table[mifi].m6_ifp &&
  592                     !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
  593                         if_allmulti(mif6table[mifi].m6_ifp, 0);
  594                 }
  595         }
  596         bzero((caddr_t)mif6table, sizeof(mif6table));
  597         nummifs = 0;
  598 
  599         V_pim6 = 0; /* used to stub out/in pim specific code */
  600 
  601         callout_stop(&expire_upcalls_ch);
  602 
  603         /*
  604          * Free all multicast forwarding cache entries.
  605          */
  606         MFC6_LOCK();
  607         for (i = 0; i < MF6CTBLSIZ; i++) {
  608                 rt = mf6ctable[i];
  609                 while (rt) {
  610                         struct mf6c *frt;
  611 
  612                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  613                                 struct rtdetq *n = rte->next;
  614 
  615                                 m_free(rte->m);
  616                                 free(rte, M_MRTABLE6);
  617                                 rte = n;
  618                         }
  619                         frt = rt;
  620                         rt = rt->mf6c_next;
  621                         free(frt, M_MRTABLE6);
  622                 }
  623         }
  624         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  625         MFC6_UNLOCK();
  626 
  627         /*
  628          * Reset register interface
  629          */
  630         if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
  631                 if_detach(multicast_register_if6);
  632                 if_free(multicast_register_if6);
  633                 reg_mif_num = (mifi_t)-1;
  634                 multicast_register_if6 = NULL;
  635         }
  636 
  637         V_ip6_mrouter = NULL;
  638         V_ip6_mrouter_ver = 0;
  639 
  640         MROUTER6_UNLOCK();
  641 
  642 #ifdef MRT6DEBUG
  643         if (V_mrt6debug)
  644                 log(LOG_DEBUG, "ip6_mrouter_done\n");
  645 #endif
  646 
  647         return (0);
  648 }
  649 
  650 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
  651 
  652 /*
  653  * Add a mif to the mif table
  654  */
  655 static int
  656 add_m6if(struct mif6ctl *mifcp)
  657 {
  658         struct mif6 *mifp;
  659         struct ifnet *ifp;
  660         int error;
  661 
  662         MIF6_LOCK();
  663 
  664         if (mifcp->mif6c_mifi >= MAXMIFS) {
  665                 MIF6_UNLOCK();
  666                 return (EINVAL);
  667         }
  668         mifp = mif6table + mifcp->mif6c_mifi;
  669         if (mifp->m6_ifp != NULL) {
  670                 MIF6_UNLOCK();
  671                 return (EADDRINUSE); /* XXX: is it appropriate? */
  672         }
  673         if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
  674                 MIF6_UNLOCK();
  675                 return (ENXIO);
  676         }
  677 
  678         ifp = ifnet_byindex(mifcp->mif6c_pifi);
  679 
  680         if (mifcp->mif6c_flags & MIFF_REGISTER) {
  681                 if (reg_mif_num == (mifi_t)-1) {
  682                         ifp = if_alloc(IFT_OTHER);
  683 
  684                         if_initname(ifp, "register_mif", 0);
  685                         ifp->if_flags |= IFF_LOOPBACK;
  686                         if_attach(ifp);
  687                         multicast_register_if6 = ifp;
  688                         reg_mif_num = mifcp->mif6c_mifi;
  689                         /*
  690                          * it is impossible to guess the ifindex of the
  691                          * register interface.  So mif6c_pifi is automatically
  692                          * calculated.
  693                          */
  694                         mifcp->mif6c_pifi = ifp->if_index;
  695                 } else {
  696                         ifp = multicast_register_if6;
  697                 }
  698         } else {
  699                 /* Make sure the interface supports multicast */
  700                 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
  701                         MIF6_UNLOCK();
  702                         return (EOPNOTSUPP);
  703                 }
  704 
  705                 error = if_allmulti(ifp, 1);
  706                 if (error) {
  707                         MIF6_UNLOCK();
  708                         return (error);
  709                 }
  710         }
  711 
  712         mifp->m6_flags     = mifcp->mif6c_flags;
  713         mifp->m6_ifp       = ifp;
  714 
  715         /* initialize per mif pkt counters */
  716         mifp->m6_pkt_in    = 0;
  717         mifp->m6_pkt_out   = 0;
  718         mifp->m6_bytes_in  = 0;
  719         mifp->m6_bytes_out = 0;
  720         bzero(&mifp->m6_route, sizeof(mifp->m6_route));
  721 
  722         /* Adjust nummifs up if the mifi is higher than nummifs */
  723         if (nummifs <= mifcp->mif6c_mifi)
  724                 nummifs = mifcp->mif6c_mifi + 1;
  725 
  726         MIF6_UNLOCK();
  727 
  728 #ifdef MRT6DEBUG
  729         if (V_mrt6debug)
  730                 log(LOG_DEBUG,
  731                     "add_mif #%d, phyint %s\n",
  732                     mifcp->mif6c_mifi,
  733                     ifp->if_xname);
  734 #endif
  735 
  736         return (0);
  737 }
  738 
  739 /*
  740  * Delete a mif from the mif table
  741  */
  742 static int
  743 del_m6if_locked(mifi_t *mifip)
  744 {
  745         struct mif6 *mifp = mif6table + *mifip;
  746         mifi_t mifi;
  747         struct ifnet *ifp;
  748 
  749         MIF6_LOCK_ASSERT();
  750 
  751         if (*mifip >= nummifs)
  752                 return (EINVAL);
  753         if (mifp->m6_ifp == NULL)
  754                 return (EINVAL);
  755 
  756         if (!(mifp->m6_flags & MIFF_REGISTER)) {
  757                 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
  758                 ifp = mifp->m6_ifp;
  759                 if_allmulti(ifp, 0);
  760         } else {
  761                 if (reg_mif_num != (mifi_t)-1 &&
  762                     multicast_register_if6 != NULL) {
  763                         if_detach(multicast_register_if6);
  764                         if_free(multicast_register_if6);
  765                         reg_mif_num = (mifi_t)-1;
  766                         multicast_register_if6 = NULL;
  767                 }
  768         }
  769 
  770         bzero((caddr_t)mifp, sizeof(*mifp));
  771 
  772         /* Adjust nummifs down */
  773         for (mifi = nummifs; mifi > 0; mifi--)
  774                 if (mif6table[mifi - 1].m6_ifp)
  775                         break;
  776         nummifs = mifi;
  777 
  778 #ifdef MRT6DEBUG
  779         if (V_mrt6debug)
  780                 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
  781 #endif
  782 
  783         return (0);
  784 }
  785 
  786 static int
  787 del_m6if(mifi_t *mifip)
  788 {
  789         int cc;
  790 
  791         MIF6_LOCK();
  792         cc = del_m6if_locked(mifip);
  793         MIF6_UNLOCK();
  794 
  795         return (cc);
  796 }
  797 
  798 /*
  799  * Add an mfc entry
  800  */
  801 static int
  802 add_m6fc(struct mf6cctl *mfccp)
  803 {
  804         struct mf6c *rt;
  805         u_long hash;
  806         struct rtdetq *rte;
  807         u_short nstl;
  808         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  809 
  810         MFC6_LOCK();
  811 
  812         MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
  813                  mfccp->mf6cc_mcastgrp.sin6_addr, rt);
  814 
  815         /* If an entry already exists, just update the fields */
  816         if (rt) {
  817 #ifdef MRT6DEBUG
  818                 if (V_mrt6debug & DEBUG_MFC) {
  819                     log(LOG_DEBUG,
  820                         "add_m6fc no upcall h %d o %s g %s p %x\n",
  821                         ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  822                         ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  823                         mfccp->mf6cc_parent);
  824                 }
  825 #endif
  826 
  827                 rt->mf6c_parent = mfccp->mf6cc_parent;
  828                 rt->mf6c_ifset = mfccp->mf6cc_ifset;
  829 
  830                 MFC6_UNLOCK();
  831                 return (0);
  832         }
  833 
  834         /*
  835          * Find the entry for which the upcall was made and update
  836          */
  837         hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
  838                         mfccp->mf6cc_mcastgrp.sin6_addr);
  839         for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
  840                 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  841                                        &mfccp->mf6cc_origin.sin6_addr) &&
  842                     IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  843                                        &mfccp->mf6cc_mcastgrp.sin6_addr) &&
  844                     (rt->mf6c_stall != NULL)) {
  845 
  846                         if (nstl++)
  847                                 log(LOG_ERR,
  848                                     "add_m6fc: %s o %s g %s p %x dbx %p\n",
  849                                     "multiple kernel entries",
  850                                     ip6_sprintf(ip6bufo,
  851                                             &mfccp->mf6cc_origin.sin6_addr),
  852                                     ip6_sprintf(ip6bufg,
  853                                             &mfccp->mf6cc_mcastgrp.sin6_addr),
  854                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  855 
  856 #ifdef MRT6DEBUG
  857                         if (V_mrt6debug & DEBUG_MFC)
  858                                 log(LOG_DEBUG,
  859                                     "add_m6fc o %s g %s p %x dbg %x\n",
  860                                     ip6_sprintf(ip6bufo,
  861                                             &mfccp->mf6cc_origin.sin6_addr),
  862                                     ip6_sprintf(ip6bufg,
  863                                             &mfccp->mf6cc_mcastgrp.sin6_addr),
  864                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  865 #endif
  866 
  867                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  868                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  869                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  870                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  871                         /* initialize pkt counters per src-grp */
  872                         rt->mf6c_pkt_cnt    = 0;
  873                         rt->mf6c_byte_cnt   = 0;
  874                         rt->mf6c_wrong_if   = 0;
  875 
  876                         rt->mf6c_expire = 0;    /* Don't clean this guy up */
  877                         n6expire[hash]--;
  878 
  879                         /* free packets Qed at the end of this entry */
  880                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  881                                 struct rtdetq *n = rte->next;
  882                                 ip6_mdq(rte->m, rte->ifp, rt);
  883                                 m_freem(rte->m);
  884 #ifdef UPCALL_TIMING
  885                                 collate(&(rte->t));
  886 #endif /* UPCALL_TIMING */
  887                                 free(rte, M_MRTABLE6);
  888                                 rte = n;
  889                         }
  890                         rt->mf6c_stall = NULL;
  891                 }
  892         }
  893 
  894         /*
  895          * It is possible that an entry is being inserted without an upcall
  896          */
  897         if (nstl == 0) {
  898 #ifdef MRT6DEBUG
  899                 if (V_mrt6debug & DEBUG_MFC)
  900                     log(LOG_DEBUG,
  901                         "add_mfc no upcall h %d o %s g %s p %x\n",
  902                         hash,
  903                         ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  904                         ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  905                         mfccp->mf6cc_parent);
  906 #endif
  907 
  908                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
  909 
  910                         if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  911                                                &mfccp->mf6cc_origin.sin6_addr)&&
  912                             IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  913                                                &mfccp->mf6cc_mcastgrp.sin6_addr)) {
  914 
  915                                 rt->mf6c_origin     = mfccp->mf6cc_origin;
  916                                 rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  917                                 rt->mf6c_parent     = mfccp->mf6cc_parent;
  918                                 rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  919                                 /* initialize pkt counters per src-grp */
  920                                 rt->mf6c_pkt_cnt    = 0;
  921                                 rt->mf6c_byte_cnt   = 0;
  922                                 rt->mf6c_wrong_if   = 0;
  923 
  924                                 if (rt->mf6c_expire)
  925                                         n6expire[hash]--;
  926                                 rt->mf6c_expire    = 0;
  927                         }
  928                 }
  929                 if (rt == NULL) {
  930                         /* no upcall, so make a new entry */
  931                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
  932                                                   M_NOWAIT);
  933                         if (rt == NULL) {
  934                                 MFC6_UNLOCK();
  935                                 return (ENOBUFS);
  936                         }
  937 
  938                         /* insert new entry at head of hash chain */
  939                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  940                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  941                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  942                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  943                         /* initialize pkt counters per src-grp */
  944                         rt->mf6c_pkt_cnt    = 0;
  945                         rt->mf6c_byte_cnt   = 0;
  946                         rt->mf6c_wrong_if   = 0;
  947                         rt->mf6c_expire     = 0;
  948                         rt->mf6c_stall = NULL;
  949 
  950                         /* link into table */
  951                         rt->mf6c_next  = mf6ctable[hash];
  952                         mf6ctable[hash] = rt;
  953                 }
  954         }
  955 
  956         MFC6_UNLOCK();
  957         return (0);
  958 }
  959 
  960 #ifdef UPCALL_TIMING
  961 /*
  962  * collect delay statistics on the upcalls
  963  */
  964 static void
  965 collate(struct timeval *t)
  966 {
  967         u_long d;
  968         struct timeval tp;
  969         u_long delta;
  970 
  971         GET_TIME(tp);
  972 
  973         if (TV_LT(*t, tp))
  974         {
  975                 TV_DELTA(tp, *t, delta);
  976 
  977                 d = delta >> 10;
  978                 if (d > UPCALL_MAX)
  979                         d = UPCALL_MAX;
  980 
  981                 ++upcall_data[d];
  982         }
  983 }
  984 #endif /* UPCALL_TIMING */
  985 
  986 /*
  987  * Delete an mfc entry
  988  */
  989 static int
  990 del_m6fc(struct mf6cctl *mfccp)
  991 {
  992         struct sockaddr_in6     origin;
  993         struct sockaddr_in6     mcastgrp;
  994         struct mf6c             *rt;
  995         struct mf6c             **nptr;
  996         u_long          hash;
  997 
  998         origin = mfccp->mf6cc_origin;
  999         mcastgrp = mfccp->mf6cc_mcastgrp;
 1000         hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
 1001 
 1002 #ifdef MRT6DEBUG
 1003         if (V_mrt6debug & DEBUG_MFC) {
 1004                 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
 1005                 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
 1006                     ip6_sprintf(ip6bufo, &origin.sin6_addr),
 1007                     ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
 1008         }
 1009 #endif
 1010 
 1011         MFC6_LOCK();
 1012 
 1013         nptr = &mf6ctable[hash];
 1014         while ((rt = *nptr) != NULL) {
 1015                 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
 1016                                        &rt->mf6c_origin.sin6_addr) &&
 1017                     IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
 1018                                        &rt->mf6c_mcastgrp.sin6_addr) &&
 1019                     rt->mf6c_stall == NULL)
 1020                         break;
 1021 
 1022                 nptr = &rt->mf6c_next;
 1023         }
 1024         if (rt == NULL) {
 1025                 MFC6_UNLOCK();
 1026                 return (EADDRNOTAVAIL);
 1027         }
 1028 
 1029         *nptr = rt->mf6c_next;
 1030         free(rt, M_MRTABLE6);
 1031 
 1032         MFC6_UNLOCK();
 1033 
 1034         return (0);
 1035 }
 1036 
 1037 static int
 1038 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
 1039 {
 1040 
 1041         if (s) {
 1042                 if (sbappendaddr(&s->so_rcv,
 1043                                  (struct sockaddr *)src,
 1044                                  mm, (struct mbuf *)0) != 0) {
 1045                         sorwakeup(s);
 1046                         return (0);
 1047                 }
 1048         }
 1049         m_freem(mm);
 1050         return (-1);
 1051 }
 1052 
 1053 /*
 1054  * IPv6 multicast forwarding function. This function assumes that the packet
 1055  * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
 1056  * pointed to by "ifp", and the packet is to be relayed to other networks
 1057  * that have members of the packet's destination IPv6 multicast group.
 1058  *
 1059  * The packet is returned unscathed to the caller, unless it is
 1060  * erroneous, in which case a non-zero return value tells the caller to
 1061  * discard it.
 1062  *
 1063  * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
 1064  * this function is called in the originating context (i.e., not when
 1065  * forwarding a packet from other node).  ip6_output(), which is currently the
 1066  * only function that calls this function is called in the originating context,
 1067  * explicitly ensures this condition.  It is caller's responsibility to ensure
 1068  * that if this function is called from somewhere else in the originating
 1069  * context in the future.
 1070  */
 1071 int
 1072 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
 1073 {
 1074         struct mf6c *rt;
 1075         struct mif6 *mifp;
 1076         struct mbuf *mm;
 1077         mifi_t mifi;
 1078         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1079 
 1080 #ifdef MRT6DEBUG
 1081         if (V_mrt6debug & DEBUG_FORWARD)
 1082                 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
 1083                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1084                     ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1085                     ifp->if_index);
 1086 #endif
 1087 
 1088         /*
 1089          * Don't forward a packet with Hop limit of zero or one,
 1090          * or a packet destined to a local-only group.
 1091          */
 1092         if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
 1093             IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
 1094                 return (0);
 1095         ip6->ip6_hlim--;
 1096 
 1097         /*
 1098          * Source address check: do not forward packets with unspecified
 1099          * source. It was discussed in July 2000, on ipngwg mailing list.
 1100          * This is rather more serious than unicast cases, because some
 1101          * MLD packets can be sent with the unspecified source address
 1102          * (although such packets must normally set 1 to the hop limit field).
 1103          */
 1104         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
 1105                 V_ip6stat.ip6s_cantforward++;
 1106                 if (V_ip6_log_time + V_ip6_log_interval < time_second) {
 1107                         V_ip6_log_time = time_second;
 1108                         log(LOG_DEBUG,
 1109                             "cannot forward "
 1110                             "from %s to %s nxt %d received on %s\n",
 1111                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1112                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1113                             ip6->ip6_nxt,
 1114                             if_name(m->m_pkthdr.rcvif));
 1115                 }
 1116                 return (0);
 1117         }
 1118 
 1119         MFC6_LOCK();
 1120 
 1121         /*
 1122          * Determine forwarding mifs from the forwarding cache table
 1123          */
 1124         MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
 1125 
 1126         /* Entry exists, so forward if necessary */
 1127         if (rt) {
 1128                 MFC6_UNLOCK();
 1129                 return (ip6_mdq(m, ifp, rt));
 1130         } else {
 1131                 /*
 1132                  * If we don't have a route for packet's origin,
 1133                  * Make a copy of the packet &
 1134                  * send message to routing daemon
 1135                  */
 1136 
 1137                 struct mbuf *mb0;
 1138                 struct rtdetq *rte;
 1139                 u_long hash;
 1140 /*              int i, npkts;*/
 1141 #ifdef UPCALL_TIMING
 1142                 struct timeval tp;
 1143 
 1144                 GET_TIME(tp);
 1145 #endif /* UPCALL_TIMING */
 1146 
 1147                 mrt6stat.mrt6s_no_route++;
 1148 #ifdef MRT6DEBUG
 1149                 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
 1150                         log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
 1151                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1152                             ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1153 #endif
 1154 
 1155                 /*
 1156                  * Allocate mbufs early so that we don't do extra work if we
 1157                  * are just going to fail anyway.
 1158                  */
 1159                 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6,
 1160                                               M_NOWAIT);
 1161                 if (rte == NULL) {
 1162                         MFC6_UNLOCK();
 1163                         return (ENOBUFS);
 1164                 }
 1165                 mb0 = m_copy(m, 0, M_COPYALL);
 1166                 /*
 1167                  * Pullup packet header if needed before storing it,
 1168                  * as other references may modify it in the meantime.
 1169                  */
 1170                 if (mb0 &&
 1171                     (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
 1172                         mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
 1173                 if (mb0 == NULL) {
 1174                         free(rte, M_MRTABLE6);
 1175                         MFC6_UNLOCK();
 1176                         return (ENOBUFS);
 1177                 }
 1178 
 1179                 /* is there an upcall waiting for this packet? */
 1180                 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
 1181                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
 1182                         if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
 1183                                                &rt->mf6c_origin.sin6_addr) &&
 1184                             IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
 1185                                                &rt->mf6c_mcastgrp.sin6_addr) &&
 1186                             (rt->mf6c_stall != NULL))
 1187                                 break;
 1188                 }
 1189 
 1190                 if (rt == NULL) {
 1191                         struct mrt6msg *im;
 1192 #ifdef MRT6_OINIT
 1193                         struct omrt6msg *oim;
 1194 #endif
 1195 
 1196                         /* no upcall, so make a new entry */
 1197                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
 1198                                                   M_NOWAIT);
 1199                         if (rt == NULL) {
 1200                                 free(rte, M_MRTABLE6);
 1201                                 m_freem(mb0);
 1202                                 MFC6_UNLOCK();
 1203                                 return (ENOBUFS);
 1204                         }
 1205                         /*
 1206                          * Make a copy of the header to send to the user
 1207                          * level process
 1208                          */
 1209                         mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
 1210 
 1211                         if (mm == NULL) {
 1212                                 free(rte, M_MRTABLE6);
 1213                                 m_freem(mb0);
 1214                                 free(rt, M_MRTABLE6);
 1215                                 MFC6_UNLOCK();
 1216                                 return (ENOBUFS);
 1217                         }
 1218 
 1219                         /*
 1220                          * Send message to routing daemon
 1221                          */
 1222                         sin6.sin6_addr = ip6->ip6_src;
 1223 
 1224                         im = NULL;
 1225 #ifdef MRT6_OINIT
 1226                         oim = NULL;
 1227 #endif
 1228                         switch (V_ip6_mrouter_ver) {
 1229 #ifdef MRT6_OINIT
 1230                         case MRT6_OINIT:
 1231                                 oim = mtod(mm, struct omrt6msg *);
 1232                                 oim->im6_msgtype = MRT6MSG_NOCACHE;
 1233                                 oim->im6_mbz = 0;
 1234                                 break;
 1235 #endif
 1236                         case MRT6_INIT:
 1237                                 im = mtod(mm, struct mrt6msg *);
 1238                                 im->im6_msgtype = MRT6MSG_NOCACHE;
 1239                                 im->im6_mbz = 0;
 1240                                 break;
 1241                         default:
 1242                                 free(rte, M_MRTABLE6);
 1243                                 m_freem(mb0);
 1244                                 free(rt, M_MRTABLE6);
 1245                                 MFC6_UNLOCK();
 1246                                 return (EINVAL);
 1247                         }
 1248 
 1249 #ifdef MRT6DEBUG
 1250                         if (V_mrt6debug & DEBUG_FORWARD)
 1251                                 log(LOG_DEBUG,
 1252                                     "getting the iif info in the kernel\n");
 1253 #endif
 1254 
 1255                         for (mifp = mif6table, mifi = 0;
 1256                              mifi < nummifs && mifp->m6_ifp != ifp;
 1257                              mifp++, mifi++)
 1258                                 ;
 1259 
 1260                         switch (V_ip6_mrouter_ver) {
 1261 #ifdef MRT6_OINIT
 1262                         case MRT6_OINIT:
 1263                                 oim->im6_mif = mifi;
 1264                                 break;
 1265 #endif
 1266                         case MRT6_INIT:
 1267                                 im->im6_mif = mifi;
 1268                                 break;
 1269                         }
 1270 
 1271                         if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1272                                 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
 1273                                     "socket queue full\n");
 1274                                 mrt6stat.mrt6s_upq_sockfull++;
 1275                                 free(rte, M_MRTABLE6);
 1276                                 m_freem(mb0);
 1277                                 free(rt, M_MRTABLE6);
 1278                                 MFC6_UNLOCK();
 1279                                 return (ENOBUFS);
 1280                         }
 1281 
 1282                         mrt6stat.mrt6s_upcalls++;
 1283 
 1284                         /* insert new entry at head of hash chain */
 1285                         bzero(rt, sizeof(*rt));
 1286                         rt->mf6c_origin.sin6_family = AF_INET6;
 1287                         rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
 1288                         rt->mf6c_origin.sin6_addr = ip6->ip6_src;
 1289                         rt->mf6c_mcastgrp.sin6_family = AF_INET6;
 1290                         rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
 1291                         rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
 1292                         rt->mf6c_expire = UPCALL_EXPIRE;
 1293                         n6expire[hash]++;
 1294                         rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
 1295 
 1296                         /* link into table */
 1297                         rt->mf6c_next  = mf6ctable[hash];
 1298                         mf6ctable[hash] = rt;
 1299                         /* Add this entry to the end of the queue */
 1300                         rt->mf6c_stall = rte;
 1301                 } else {
 1302                         /* determine if q has overflowed */
 1303                         struct rtdetq **p;
 1304                         int npkts = 0;
 1305 
 1306                         for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
 1307                                 if (++npkts > MAX_UPQ6) {
 1308                                         mrt6stat.mrt6s_upq_ovflw++;
 1309                                         free(rte, M_MRTABLE6);
 1310                                         m_freem(mb0);
 1311                                         MFC6_UNLOCK();
 1312                                         return (0);
 1313                                 }
 1314 
 1315                         /* Add this entry to the end of the queue */
 1316                         *p = rte;
 1317                 }
 1318 
 1319                 rte->next = NULL;
 1320                 rte->m = mb0;
 1321                 rte->ifp = ifp;
 1322 #ifdef UPCALL_TIMING
 1323                 rte->t = tp;
 1324 #endif /* UPCALL_TIMING */
 1325 
 1326                 MFC6_UNLOCK();
 1327 
 1328                 return (0);
 1329         }
 1330 }
 1331 
 1332 /*
 1333  * Clean up cache entries if upcalls are not serviced
 1334  * Call from the Slow Timeout mechanism, every half second.
 1335  */
 1336 static void
 1337 expire_upcalls(void *unused)
 1338 {
 1339         struct rtdetq *rte;
 1340         struct mf6c *mfc, **nptr;
 1341         int i;
 1342 
 1343         MFC6_LOCK();
 1344         for (i = 0; i < MF6CTBLSIZ; i++) {
 1345                 if (n6expire[i] == 0)
 1346                         continue;
 1347                 nptr = &mf6ctable[i];
 1348                 while ((mfc = *nptr) != NULL) {
 1349                         rte = mfc->mf6c_stall;
 1350                         /*
 1351                          * Skip real cache entries
 1352                          * Make sure it wasn't marked to not expire (shouldn't happen)
 1353                          * If it expires now
 1354                          */
 1355                         if (rte != NULL &&
 1356                             mfc->mf6c_expire != 0 &&
 1357                             --mfc->mf6c_expire == 0) {
 1358 #ifdef MRT6DEBUG
 1359                                 if (V_mrt6debug & DEBUG_EXPIRE) {
 1360                                         char ip6bufo[INET6_ADDRSTRLEN];
 1361                                         char ip6bufg[INET6_ADDRSTRLEN];
 1362                                         log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
 1363                                             ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
 1364                                             ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
 1365                                 }
 1366 #endif
 1367                                 /*
 1368                                  * drop all the packets
 1369                                  * free the mbuf with the pkt, if, timing info
 1370                                  */
 1371                                 do {
 1372                                         struct rtdetq *n = rte->next;
 1373                                         m_freem(rte->m);
 1374                                         free(rte, M_MRTABLE6);
 1375                                         rte = n;
 1376                                 } while (rte != NULL);
 1377                                 mrt6stat.mrt6s_cache_cleanups++;
 1378                                 n6expire[i]--;
 1379 
 1380                                 *nptr = mfc->mf6c_next;
 1381                                 free(mfc, M_MRTABLE6);
 1382                         } else {
 1383                                 nptr = &mfc->mf6c_next;
 1384                         }
 1385                 }
 1386         }
 1387         MFC6_UNLOCK();
 1388         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
 1389             expire_upcalls, NULL);
 1390 }
 1391 
 1392 /*
 1393  * Packet forwarding routine once entry in the cache is made
 1394  */
 1395 static int
 1396 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
 1397 {
 1398         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1399         mifi_t mifi, iif;
 1400         struct mif6 *mifp;
 1401         int plen = m->m_pkthdr.len;
 1402         struct in6_addr src0, dst0; /* copies for local work */
 1403         u_int32_t iszone, idzone, oszone, odzone;
 1404         int error = 0;
 1405 
 1406 /*
 1407  * Macro to send packet on mif.  Since RSVP packets don't get counted on
 1408  * input, they shouldn't get counted on output, so statistics keeping is
 1409  * separate.
 1410  */
 1411 
 1412 #define MC6_SEND(ip6, mifp, m) do {                             \
 1413         if ((mifp)->m6_flags & MIFF_REGISTER)                   \
 1414                 register_send((ip6), (mifp), (m));              \
 1415         else                                                    \
 1416                 phyint_send((ip6), (mifp), (m));                \
 1417 } while (/*CONSTCOND*/ 0)
 1418 
 1419         /*
 1420          * Don't forward if it didn't arrive from the parent mif
 1421          * for its origin.
 1422          */
 1423         mifi = rt->mf6c_parent;
 1424         if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
 1425                 /* came in the wrong interface */
 1426 #ifdef MRT6DEBUG
 1427                 if (V_mrt6debug & DEBUG_FORWARD)
 1428                         log(LOG_DEBUG,
 1429                             "wrong if: ifid %d mifi %d mififid %x\n",
 1430                             ifp->if_index, mifi,
 1431                             mif6table[mifi].m6_ifp->if_index);
 1432 #endif
 1433                 mrt6stat.mrt6s_wrong_if++;
 1434                 rt->mf6c_wrong_if++;
 1435                 /*
 1436                  * If we are doing PIM processing, and we are forwarding
 1437                  * packets on this interface, send a message to the
 1438                  * routing daemon.
 1439                  */
 1440                 /* have to make sure this is a valid mif */
 1441                 if (mifi < nummifs && mif6table[mifi].m6_ifp)
 1442                         if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
 1443                                 /*
 1444                                  * Check the M_LOOP flag to avoid an
 1445                                  * unnecessary PIM assert.
 1446                                  * XXX: M_LOOP is an ad-hoc hack...
 1447                                  */
 1448                                 static struct sockaddr_in6 sin6 =
 1449                                 { sizeof(sin6), AF_INET6 };
 1450 
 1451                                 struct mbuf *mm;
 1452                                 struct mrt6msg *im;
 1453 #ifdef MRT6_OINIT
 1454                                 struct omrt6msg *oim;
 1455 #endif
 1456 
 1457                                 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
 1458                                 if (mm &&
 1459                                     (M_HASCL(mm) ||
 1460                                      mm->m_len < sizeof(struct ip6_hdr)))
 1461                                         mm = m_pullup(mm, sizeof(struct ip6_hdr));
 1462                                 if (mm == NULL)
 1463                                         return (ENOBUFS);
 1464 
 1465 #ifdef MRT6_OINIT
 1466                                 oim = NULL;
 1467 #endif
 1468                                 im = NULL;
 1469                                 switch (V_ip6_mrouter_ver) {
 1470 #ifdef MRT6_OINIT
 1471                                 case MRT6_OINIT:
 1472                                         oim = mtod(mm, struct omrt6msg *);
 1473                                         oim->im6_msgtype = MRT6MSG_WRONGMIF;
 1474                                         oim->im6_mbz = 0;
 1475                                         break;
 1476 #endif
 1477                                 case MRT6_INIT:
 1478                                         im = mtod(mm, struct mrt6msg *);
 1479                                         im->im6_msgtype = MRT6MSG_WRONGMIF;
 1480                                         im->im6_mbz = 0;
 1481                                         break;
 1482                                 default:
 1483                                         m_freem(mm);
 1484                                         return (EINVAL);
 1485                                 }
 1486 
 1487                                 for (mifp = mif6table, iif = 0;
 1488                                      iif < nummifs && mifp &&
 1489                                              mifp->m6_ifp != ifp;
 1490                                      mifp++, iif++)
 1491                                         ;
 1492 
 1493                                 switch (V_ip6_mrouter_ver) {
 1494 #ifdef MRT6_OINIT
 1495                                 case MRT6_OINIT:
 1496                                         oim->im6_mif = iif;
 1497                                         sin6.sin6_addr = oim->im6_src;
 1498                                         break;
 1499 #endif
 1500                                 case MRT6_INIT:
 1501                                         im->im6_mif = iif;
 1502                                         sin6.sin6_addr = im->im6_src;
 1503                                         break;
 1504                                 }
 1505 
 1506                                 mrt6stat.mrt6s_upcalls++;
 1507 
 1508                                 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1509 #ifdef MRT6DEBUG
 1510                                         if (V_mrt6debug)
 1511                                                 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
 1512 #endif
 1513                                         ++mrt6stat.mrt6s_upq_sockfull;
 1514                                         return (ENOBUFS);
 1515                                 }       /* if socket Q full */
 1516                         }               /* if PIM */
 1517                 return (0);
 1518         }                       /* if wrong iif */
 1519 
 1520         /* If I sourced this packet, it counts as output, else it was input. */
 1521         if (m->m_pkthdr.rcvif == NULL) {
 1522                 /* XXX: is rcvif really NULL when output?? */
 1523                 mif6table[mifi].m6_pkt_out++;
 1524                 mif6table[mifi].m6_bytes_out += plen;
 1525         } else {
 1526                 mif6table[mifi].m6_pkt_in++;
 1527                 mif6table[mifi].m6_bytes_in += plen;
 1528         }
 1529         rt->mf6c_pkt_cnt++;
 1530         rt->mf6c_byte_cnt += plen;
 1531 
 1532         /*
 1533          * For each mif, forward a copy of the packet if there are group
 1534          * members downstream on the interface.
 1535          */
 1536         src0 = ip6->ip6_src;
 1537         dst0 = ip6->ip6_dst;
 1538         if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
 1539             (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
 1540                 V_ip6stat.ip6s_badscope++;
 1541                 return (error);
 1542         }
 1543         for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
 1544                 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
 1545                         /*
 1546                          * check if the outgoing packet is going to break
 1547                          * a scope boundary.
 1548                          * XXX For packets through PIM register tunnel
 1549                          * interface, we believe a routing daemon.
 1550                          */
 1551                         if (!(mif6table[rt->mf6c_parent].m6_flags &
 1552                               MIFF_REGISTER) &&
 1553                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
 1554                                 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
 1555                                     &oszone) ||
 1556                                     in6_setscope(&dst0, mif6table[mifi].m6_ifp,
 1557                                     &odzone) ||
 1558                                     iszone != oszone ||
 1559                                     idzone != odzone) {
 1560                                         V_ip6stat.ip6s_badscope++;
 1561                                         continue;
 1562                                 }
 1563                         }
 1564 
 1565                         mifp->m6_pkt_out++;
 1566                         mifp->m6_bytes_out += plen;
 1567                         MC6_SEND(ip6, mifp, m);
 1568                 }
 1569         }
 1570         return (0);
 1571 }
 1572 
 1573 static void
 1574 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
 1575 {
 1576         struct mbuf *mb_copy;
 1577         struct ifnet *ifp = mifp->m6_ifp;
 1578         int error = 0;
 1579         struct sockaddr_in6 *dst6;
 1580         u_long linkmtu;
 1581 
 1582         dst6 = &mifp->m6_route.ro_dst;
 1583 
 1584         /*
 1585          * Make a new reference to the packet; make sure that
 1586          * the IPv6 header is actually copied, not just referenced,
 1587          * so that ip6_output() only scribbles on the copy.
 1588          */
 1589         mb_copy = m_copy(m, 0, M_COPYALL);
 1590         if (mb_copy &&
 1591             (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
 1592                 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
 1593         if (mb_copy == NULL) {
 1594                 return;
 1595         }
 1596         /* set MCAST flag to the outgoing packet */
 1597         mb_copy->m_flags |= M_MCAST;
 1598 
 1599         /*
 1600          * If we sourced the packet, call ip6_output since we may devide
 1601          * the packet into fragments when the packet is too big for the
 1602          * outgoing interface.
 1603          * Otherwise, we can simply send the packet to the interface
 1604          * sending queue.
 1605          */
 1606         if (m->m_pkthdr.rcvif == NULL) {
 1607                 struct ip6_moptions im6o;
 1608 
 1609                 im6o.im6o_multicast_ifp = ifp;
 1610                 /* XXX: ip6_output will override ip6->ip6_hlim */
 1611                 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
 1612                 im6o.im6o_multicast_loop = 1;
 1613                 error = ip6_output(mb_copy, NULL, &mifp->m6_route,
 1614                                    IPV6_FORWARDING, &im6o, NULL, NULL);
 1615 
 1616 #ifdef MRT6DEBUG
 1617                 if (V_mrt6debug & DEBUG_XMIT)
 1618                         log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
 1619                             mifp - mif6table, error);
 1620 #endif
 1621                 return;
 1622         }
 1623 
 1624         /*
 1625          * If configured to loop back multicasts by default,
 1626          * loop back a copy now.
 1627          */
 1628         if (in6_mcast_loop) {
 1629                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1630                 dst6->sin6_family = AF_INET6;
 1631                 dst6->sin6_addr = ip6->ip6_dst;
 1632                 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst);
 1633         }
 1634 
 1635         /*
 1636          * Put the packet into the sending queue of the outgoing interface
 1637          * if it would fit in the MTU of the interface.
 1638          */
 1639         linkmtu = IN6_LINKMTU(ifp);
 1640         if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
 1641                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1642                 dst6->sin6_family = AF_INET6;
 1643                 dst6->sin6_addr = ip6->ip6_dst;
 1644                 /*
 1645                  * We just call if_output instead of nd6_output here, since
 1646                  * we need no ND for a multicast forwarded packet...right?
 1647                  */
 1648                 error = (*ifp->if_output)(ifp, mb_copy,
 1649                     (struct sockaddr *)&mifp->m6_route.ro_dst, NULL);
 1650 #ifdef MRT6DEBUG
 1651                 if (V_mrt6debug & DEBUG_XMIT)
 1652                         log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
 1653                             mifp - mif6table, error);
 1654 #endif
 1655         } else {
 1656                 /*
 1657                  * pMTU discovery is intentionally disabled by default, since
 1658                  * various router may notify pMTU in multicast, which can be
 1659                  * a DDoS to a router
 1660                  */
 1661                 if (V_ip6_mcast_pmtu)
 1662                         icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
 1663                 else {
 1664 #ifdef MRT6DEBUG
 1665                         if (V_mrt6debug & DEBUG_XMIT) {
 1666                                 char ip6bufs[INET6_ADDRSTRLEN];
 1667                                 char ip6bufd[INET6_ADDRSTRLEN];
 1668                                 log(LOG_DEBUG,
 1669                                     "phyint_send: packet too big on %s o %s "
 1670                                     "g %s size %d(discarded)\n",
 1671                                     if_name(ifp),
 1672                                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1673                                     ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1674                                     mb_copy->m_pkthdr.len);
 1675                         }
 1676 #endif /* MRT6DEBUG */
 1677                         m_freem(mb_copy); /* simply discard the packet */
 1678                 }
 1679         }
 1680 }
 1681 
 1682 static int
 1683 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
 1684 {
 1685         struct mbuf *mm;
 1686         int i, len = m->m_pkthdr.len;
 1687         static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
 1688         struct mrt6msg *im6;
 1689 
 1690 #ifdef MRT6DEBUG
 1691         if (V_mrt6debug) {
 1692                 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1693                 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
 1694                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1695                     ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1696         }
 1697 #endif
 1698         ++pim6stat.pim6s_snd_registers;
 1699 
 1700         /* Make a copy of the packet to send to the user level process */
 1701         MGETHDR(mm, M_DONTWAIT, MT_HEADER);
 1702         if (mm == NULL)
 1703                 return (ENOBUFS);
 1704         mm->m_pkthdr.rcvif = NULL;
 1705         mm->m_data += max_linkhdr;
 1706         mm->m_len = sizeof(struct ip6_hdr);
 1707 
 1708         if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
 1709                 m_freem(mm);
 1710                 return (ENOBUFS);
 1711         }
 1712         i = MHLEN - M_LEADINGSPACE(mm);
 1713         if (i > len)
 1714                 i = len;
 1715         mm = m_pullup(mm, i);
 1716         if (mm == NULL)
 1717                 return (ENOBUFS);
 1718 /* TODO: check it! */
 1719         mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
 1720 
 1721         /*
 1722          * Send message to routing daemon
 1723          */
 1724         sin6.sin6_addr = ip6->ip6_src;
 1725 
 1726         im6 = mtod(mm, struct mrt6msg *);
 1727         im6->im6_msgtype      = MRT6MSG_WHOLEPKT;
 1728         im6->im6_mbz          = 0;
 1729 
 1730         im6->im6_mif = mif - mif6table;
 1731 
 1732         /* iif info is not given for reg. encap.n */
 1733         mrt6stat.mrt6s_upcalls++;
 1734 
 1735         if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1736 #ifdef MRT6DEBUG
 1737                 if (V_mrt6debug)
 1738                         log(LOG_WARNING,
 1739                             "register_send: ip6_mrouter socket queue full\n");
 1740 #endif
 1741                 ++mrt6stat.mrt6s_upq_sockfull;
 1742                 return (ENOBUFS);
 1743         }
 1744         return (0);
 1745 }
 1746 
 1747 /*
 1748  * pim6_encapcheck() is called by the encap6_input() path at runtime to
 1749  * determine if a packet is for PIM; allowing PIM to be dynamically loaded
 1750  * into the kernel.
 1751  */
 1752 static int
 1753 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
 1754 {
 1755 
 1756 #ifdef DIAGNOSTIC
 1757     KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
 1758 #endif
 1759     if (proto != IPPROTO_PIM)
 1760         return 0;       /* not for us; reject the datagram. */
 1761 
 1762     return 64;          /* claim the datagram. */
 1763 }
 1764 
 1765 /*
 1766  * PIM sparse mode hook
 1767  * Receives the pim control messages, and passes them up to the listening
 1768  * socket, using rip6_input.
 1769  * The only message processed is the REGISTER pim message; the pim header
 1770  * is stripped off, and the inner packet is passed to register_mforward.
 1771  */
 1772 int
 1773 pim6_input(struct mbuf **mp, int *offp, int proto)
 1774 {
 1775         struct pim *pim; /* pointer to a pim struct */
 1776         struct ip6_hdr *ip6;
 1777         int pimlen;
 1778         struct mbuf *m = *mp;
 1779         int minlen;
 1780         int off = *offp;
 1781 
 1782         ++pim6stat.pim6s_rcv_total;
 1783 
 1784         ip6 = mtod(m, struct ip6_hdr *);
 1785         pimlen = m->m_pkthdr.len - *offp;
 1786 
 1787         /*
 1788          * Validate lengths
 1789          */
 1790         if (pimlen < PIM_MINLEN) {
 1791                 ++pim6stat.pim6s_rcv_tooshort;
 1792 #ifdef MRT6DEBUG
 1793                 if (V_mrt6debug & DEBUG_PIM)
 1794                         log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
 1795 #endif
 1796                 m_freem(m);
 1797                 return (IPPROTO_DONE);
 1798         }
 1799 
 1800         /*
 1801          * if the packet is at least as big as a REGISTER, go ahead
 1802          * and grab the PIM REGISTER header size, to avoid another
 1803          * possible m_pullup() later.
 1804          *
 1805          * PIM_MINLEN       == pimhdr + u_int32 == 8
 1806          * PIM6_REG_MINLEN   == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
 1807          */
 1808         minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
 1809 
 1810         /*
 1811          * Make sure that the IP6 and PIM headers in contiguous memory, and
 1812          * possibly the PIM REGISTER header
 1813          */
 1814 #ifndef PULLDOWN_TEST
 1815         IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
 1816         /* adjust pointer */
 1817         ip6 = mtod(m, struct ip6_hdr *);
 1818 
 1819         /* adjust mbuf to point to the PIM header */
 1820         pim = (struct pim *)((caddr_t)ip6 + off);
 1821 #else
 1822         IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
 1823         if (pim == NULL) {
 1824                 pim6stat.pim6s_rcv_tooshort++;
 1825                 return (IPPROTO_DONE);
 1826         }
 1827 #endif
 1828 
 1829 #define PIM6_CHECKSUM
 1830 #ifdef PIM6_CHECKSUM
 1831         {
 1832                 int cksumlen;
 1833 
 1834                 /*
 1835                  * Validate checksum.
 1836                  * If PIM REGISTER, exclude the data packet
 1837                  */
 1838                 if (pim->pim_type == PIM_REGISTER)
 1839                         cksumlen = PIM_MINLEN;
 1840                 else
 1841                         cksumlen = pimlen;
 1842 
 1843                 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
 1844                         ++pim6stat.pim6s_rcv_badsum;
 1845 #ifdef MRT6DEBUG
 1846                         if (V_mrt6debug & DEBUG_PIM)
 1847                                 log(LOG_DEBUG,
 1848                                     "pim6_input: invalid checksum\n");
 1849 #endif
 1850                         m_freem(m);
 1851                         return (IPPROTO_DONE);
 1852                 }
 1853         }
 1854 #endif /* PIM_CHECKSUM */
 1855 
 1856         /* PIM version check */
 1857         if (pim->pim_ver != PIM_VERSION) {
 1858                 ++pim6stat.pim6s_rcv_badversion;
 1859 #ifdef MRT6DEBUG
 1860                 log(LOG_ERR,
 1861                     "pim6_input: incorrect version %d, expecting %d\n",
 1862                     pim->pim_ver, PIM_VERSION);
 1863 #endif
 1864                 m_freem(m);
 1865                 return (IPPROTO_DONE);
 1866         }
 1867 
 1868         if (pim->pim_type == PIM_REGISTER) {
 1869                 /*
 1870                  * since this is a REGISTER, we'll make a copy of the register
 1871                  * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
 1872                  * routing daemon.
 1873                  */
 1874                 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
 1875 
 1876                 struct mbuf *mcp;
 1877                 struct ip6_hdr *eip6;
 1878                 u_int32_t *reghdr;
 1879                 int rc;
 1880 #ifdef MRT6DEBUG
 1881                 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1882 #endif
 1883 
 1884                 ++pim6stat.pim6s_rcv_registers;
 1885 
 1886                 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
 1887 #ifdef MRT6DEBUG
 1888                         if (V_mrt6debug & DEBUG_PIM)
 1889                                 log(LOG_DEBUG,
 1890                                     "pim6_input: register mif not set: %d\n",
 1891                                     reg_mif_num);
 1892 #endif
 1893                         m_freem(m);
 1894                         return (IPPROTO_DONE);
 1895                 }
 1896 
 1897                 reghdr = (u_int32_t *)(pim + 1);
 1898 
 1899                 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
 1900                         goto pim6_input_to_daemon;
 1901 
 1902                 /*
 1903                  * Validate length
 1904                  */
 1905                 if (pimlen < PIM6_REG_MINLEN) {
 1906                         ++pim6stat.pim6s_rcv_tooshort;
 1907                         ++pim6stat.pim6s_rcv_badregisters;
 1908 #ifdef MRT6DEBUG
 1909                         log(LOG_ERR,
 1910                             "pim6_input: register packet size too "
 1911                             "small %d from %s\n",
 1912                             pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
 1913 #endif
 1914                         m_freem(m);
 1915                         return (IPPROTO_DONE);
 1916                 }
 1917 
 1918                 eip6 = (struct ip6_hdr *) (reghdr + 1);
 1919 #ifdef MRT6DEBUG
 1920                 if (V_mrt6debug & DEBUG_PIM)
 1921                         log(LOG_DEBUG,
 1922                             "pim6_input[register], eip6: %s -> %s, "
 1923                             "eip6 plen %d\n",
 1924                             ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1925                             ip6_sprintf(ip6bufd, &eip6->ip6_dst),
 1926                             ntohs(eip6->ip6_plen));
 1927 #endif
 1928 
 1929                 /* verify the version number of the inner packet */
 1930                 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
 1931                         ++pim6stat.pim6s_rcv_badregisters;
 1932 #ifdef MRT6DEBUG
 1933                         log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
 1934                             "of the inner packet\n",
 1935                             (eip6->ip6_vfc & IPV6_VERSION));
 1936 #endif
 1937                         m_freem(m);
 1938                         return (IPPROTO_NONE);
 1939                 }
 1940 
 1941                 /* verify the inner packet is destined to a mcast group */
 1942                 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
 1943                         ++pim6stat.pim6s_rcv_badregisters;
 1944 #ifdef MRT6DEBUG
 1945                         if (V_mrt6debug & DEBUG_PIM)
 1946                                 log(LOG_DEBUG,
 1947                                     "pim6_input: inner packet of register "
 1948                                     "is not multicast %s\n",
 1949                                     ip6_sprintf(ip6bufd, &eip6->ip6_dst));
 1950 #endif
 1951                         m_freem(m);
 1952                         return (IPPROTO_DONE);
 1953                 }
 1954 
 1955                 /*
 1956                  * make a copy of the whole header to pass to the daemon later.
 1957                  */
 1958                 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
 1959                 if (mcp == NULL) {
 1960 #ifdef MRT6DEBUG
 1961                         log(LOG_ERR,
 1962                             "pim6_input: pim register: "
 1963                             "could not copy register head\n");
 1964 #endif
 1965                         m_freem(m);
 1966                         return (IPPROTO_DONE);
 1967                 }
 1968 
 1969                 /*
 1970                  * forward the inner ip6 packet; point m_data at the inner ip6.
 1971                  */
 1972                 m_adj(m, off + PIM_MINLEN);
 1973 #ifdef MRT6DEBUG
 1974                 if (V_mrt6debug & DEBUG_PIM) {
 1975                         log(LOG_DEBUG,
 1976                             "pim6_input: forwarding decapsulated register: "
 1977                             "src %s, dst %s, mif %d\n",
 1978                             ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1979                             ip6_sprintf(ip6bufd, &eip6->ip6_dst),
 1980                             reg_mif_num);
 1981                 }
 1982 #endif
 1983 
 1984                 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
 1985                                 dst.sin6_family, 0);
 1986 
 1987                 /* prepare the register head to send to the mrouting daemon */
 1988                 m = mcp;
 1989         }
 1990 
 1991         /*
 1992          * Pass the PIM message up to the daemon; if it is a register message
 1993          * pass the 'head' only up to the daemon. This includes the
 1994          * encapsulator ip6 header, pim header, register header and the
 1995          * encapsulated ip6 header.
 1996          */
 1997   pim6_input_to_daemon:
 1998         rip6_input(&m, offp, proto);
 1999         return (IPPROTO_DONE);
 2000 }
 2001 
 2002 static int
 2003 ip6_mroute_modevent(module_t mod, int type, void *unused)
 2004 {
 2005 
 2006         switch (type) {
 2007         case MOD_LOAD:
 2008                 MROUTER6_LOCK_INIT();
 2009                 MFC6_LOCK_INIT();
 2010                 MIF6_LOCK_INIT();
 2011 
 2012                 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
 2013                         pim6_encapcheck,
 2014                         (const struct protosw *)&in6_pim_protosw, NULL);
 2015                 if (pim6_encap_cookie == NULL) {
 2016                         printf("ip6_mroute: unable to attach pim6 encap\n");
 2017                         MIF6_LOCK_DESTROY();
 2018                         MFC6_LOCK_DESTROY();
 2019                         MROUTER6_LOCK_DESTROY();
 2020                         return (EINVAL);
 2021                 }
 2022 
 2023                 ip6_mforward = X_ip6_mforward;
 2024                 ip6_mrouter_done = X_ip6_mrouter_done;
 2025                 ip6_mrouter_get = X_ip6_mrouter_get;
 2026                 ip6_mrouter_set = X_ip6_mrouter_set;
 2027                 mrt6_ioctl = X_mrt6_ioctl;
 2028                 break;
 2029 
 2030         case MOD_UNLOAD:
 2031                 if (V_ip6_mrouter != NULL)
 2032                         return EINVAL;
 2033 
 2034                 if (pim6_encap_cookie) {
 2035                         encap_detach(pim6_encap_cookie);
 2036                         pim6_encap_cookie = NULL;
 2037                 }
 2038                 X_ip6_mrouter_done();
 2039                 ip6_mforward = NULL;
 2040                 ip6_mrouter_done = NULL;
 2041                 ip6_mrouter_get = NULL;
 2042                 ip6_mrouter_set = NULL;
 2043                 mrt6_ioctl = NULL;
 2044 
 2045                 MIF6_LOCK_DESTROY();
 2046                 MFC6_LOCK_DESTROY();
 2047                 MROUTER6_LOCK_DESTROY();
 2048                 break;
 2049 
 2050         default:
 2051                 return (EOPNOTSUPP);
 2052         }
 2053 
 2054         return (0);
 2055 }
 2056 
 2057 static moduledata_t ip6_mroutemod = {
 2058         "ip6_mroute",
 2059         ip6_mroute_modevent,
 2060         0
 2061 };
 2062 
 2063 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);

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