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/8.4/sys/netinet6/ip6_mroute.c 243677 2012-11-29 17:41:19Z ae $");
   83 
   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/module.h>
   94 #include <sys/domain.h>
   95 #include <sys/protosw.h>
   96 #include <sys/signalvar.h>
   97 #include <sys/socket.h>
   98 #include <sys/socketvar.h>
   99 #include <sys/sockio.h>
  100 #include <sys/sx.h>
  101 #include <sys/sysctl.h>
  102 #include <sys/syslog.h>
  103 #include <sys/systm.h>
  104 #include <sys/time.h>
  105 
  106 #include <net/if.h>
  107 #include <net/if_types.h>
  108 #include <net/raw_cb.h>
  109 #include <net/vnet.h>
  110 
  111 #include <netinet/in.h>
  112 #include <netinet/in_var.h>
  113 #include <netinet/icmp6.h>
  114 #include <netinet/ip_encap.h>
  115 
  116 #include <netinet/ip6.h>
  117 #include <netinet6/ip6_var.h>
  118 #include <netinet6/scope6_var.h>
  119 #include <netinet6/nd6.h>
  120 #include <netinet6/ip6_mroute.h>
  121 #include <netinet6/ip6protosw.h>
  122 #include <netinet6/pim6.h>
  123 #include <netinet6/pim6_var.h>
  124 
  125 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
  126 
  127 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
  128 #define M_HASCL(m) ((m)->m_flags & M_EXT)
  129 
  130 static int      ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
  131 static void     phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
  132 static int      register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
  133 static int      set_pim6(int *);
  134 static int      socket_send(struct socket *, struct mbuf *,
  135                     struct sockaddr_in6 *);
  136 
  137 extern int in6_mcast_loop;
  138 extern struct domain inet6domain;
  139 
  140 static const struct encaptab *pim6_encap_cookie;
  141 static const struct ip6protosw in6_pim_protosw = {
  142         .pr_type =              SOCK_RAW,
  143         .pr_domain =            &inet6domain,
  144         .pr_protocol =          IPPROTO_PIM,
  145         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  146         .pr_input =             pim6_input,
  147         .pr_output =            rip6_output,
  148         .pr_ctloutput =         rip6_ctloutput,
  149         .pr_usrreqs =           &rip6_usrreqs
  150 };
  151 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
  152 
  153 static VNET_DEFINE(int, ip6_mrouter_ver) = 0;
  154 #define V_ip6_mrouter_ver       VNET(ip6_mrouter_ver)
  155 
  156 SYSCTL_DECL(_net_inet6);
  157 SYSCTL_DECL(_net_inet6_ip6);
  158 SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
  159 
  160 static struct mrt6stat mrt6stat;
  161 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
  162     &mrt6stat, mrt6stat,
  163     "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
  164 
  165 #define NO_RTE_FOUND    0x1
  166 #define RTE_FOUND       0x2
  167 
  168 static struct mtx mrouter6_mtx;
  169 #define MROUTER6_LOCK()         mtx_lock(&mrouter6_mtx)
  170 #define MROUTER6_UNLOCK()       mtx_unlock(&mrouter6_mtx)
  171 #define MROUTER6_LOCK_ASSERT()  do {                                    \
  172         mtx_assert(&mrouter6_mtx, MA_OWNED);                            \
  173         NET_ASSERT_GIANT();                                             \
  174 } while (0)
  175 #define MROUTER6_LOCK_INIT()    \
  176         mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
  177 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
  178 
  179 static struct mf6c *mf6ctable[MF6CTBLSIZ];
  180 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
  181     &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
  182     "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
  183     "netinet6/ip6_mroute.h)");
  184 
  185 static struct mtx mfc6_mtx;
  186 #define MFC6_LOCK()             mtx_lock(&mfc6_mtx)
  187 #define MFC6_UNLOCK()           mtx_unlock(&mfc6_mtx)
  188 #define MFC6_LOCK_ASSERT()      do {                                    \
  189         mtx_assert(&mfc6_mtx, MA_OWNED);                                \
  190         NET_ASSERT_GIANT();                                             \
  191 } while (0)
  192 #define MFC6_LOCK_INIT()                \
  193         mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
  194 #define MFC6_LOCK_DESTROY()     mtx_destroy(&mfc6_mtx)
  195 
  196 static u_char n6expire[MF6CTBLSIZ];
  197 
  198 static struct mif6 mif6table[MAXMIFS];
  199 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
  200     &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]",
  201     "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)");
  202 
  203 static struct mtx mif6_mtx;
  204 #define MIF6_LOCK()             mtx_lock(&mif6_mtx)
  205 #define MIF6_UNLOCK()           mtx_unlock(&mif6_mtx)
  206 #define MIF6_LOCK_ASSERT()      mtx_assert(&mif6_mtx, MA_OWNED)
  207 #define MIF6_LOCK_INIT()        \
  208         mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
  209 #define MIF6_LOCK_DESTROY()     mtx_destroy(&mif6_mtx)
  210 
  211 #ifdef MRT6DEBUG
  212 static VNET_DEFINE(u_int, mrt6debug) = 0;       /* debug level */
  213 #define V_mrt6debug             VNET(mrt6debug)
  214 #define DEBUG_MFC       0x02
  215 #define DEBUG_FORWARD   0x04
  216 #define DEBUG_EXPIRE    0x08
  217 #define DEBUG_XMIT      0x10
  218 #define DEBUG_REG       0x20
  219 #define DEBUG_PIM       0x40
  220 #endif
  221 
  222 static void     expire_upcalls(void *);
  223 #define EXPIRE_TIMEOUT  (hz / 4)        /* 4x / second */
  224 #define UPCALL_EXPIRE   6               /* number of timeouts */
  225 
  226 /*
  227  * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
  228  */
  229 
  230 /*
  231  * 'Interfaces' associated with decapsulator (so we can tell
  232  * packets that went through it from ones that get reflected
  233  * by a broken gateway).  Different from IPv4 register_if,
  234  * these interfaces are linked into the system ifnet list,
  235  * because per-interface IPv6 statistics are maintained in
  236  * ifp->if_afdata.  But it does not have any routes point
  237  * to them.  I.e., packets can't be sent this way.  They
  238  * only exist as a placeholder for multicast source
  239  * verification.
  240  */
  241 static struct ifnet *multicast_register_if6;
  242 
  243 #define ENCAP_HOPS 64
  244 
  245 /*
  246  * Private variables.
  247  */
  248 static mifi_t nummifs = 0;
  249 static mifi_t reg_mif_num = (mifi_t)-1;
  250 
  251 static struct pim6stat pim6stat;
  252 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD,
  253     &pim6stat, pim6stat,
  254     "PIM Statistics (struct pim6stat, netinet6/pim_var.h)");
  255 
  256 static VNET_DEFINE(int, pim6);
  257 #define V_pim6          VNET(pim6)
  258 
  259 /*
  260  * Hash function for a source, group entry
  261  */
  262 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
  263                                    (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
  264                                    (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
  265                                    (g).s6_addr32[2] ^ (g).s6_addr32[3])
  266 
  267 /*
  268  * Find a route for a given origin IPv6 address and Multicast group address.
  269  */
  270 #define MF6CFIND(o, g, rt) do { \
  271         struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
  272         rt = NULL; \
  273         mrt6stat.mrt6s_mfc_lookups++; \
  274         while (_rt) { \
  275                 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
  276                     IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
  277                     (_rt->mf6c_stall == NULL)) { \
  278                         rt = _rt; \
  279                         break; \
  280                 } \
  281                 _rt = _rt->mf6c_next; \
  282         } \
  283         if (rt == NULL) { \
  284                 mrt6stat.mrt6s_mfc_misses++; \
  285         } \
  286 } while (/*CONSTCOND*/ 0)
  287 
  288 /*
  289  * Macros to compute elapsed time efficiently
  290  * Borrowed from Van Jacobson's scheduling code
  291  * XXX: replace with timersub() ?
  292  */
  293 #define TV_DELTA(a, b, delta) do { \
  294             int xxs; \
  295                 \
  296             delta = (a).tv_usec - (b).tv_usec; \
  297             if ((xxs = (a).tv_sec - (b).tv_sec)) { \
  298                switch (xxs) { \
  299                       case 2: \
  300                           delta += 1000000; \
  301                               /* FALLTHROUGH */ \
  302                       case 1: \
  303                           delta += 1000000; \
  304                           break; \
  305                       default: \
  306                           delta += (1000000 * xxs); \
  307                } \
  308             } \
  309 } while (/*CONSTCOND*/ 0)
  310 
  311 /* XXX: replace with timercmp(a, b, <) ? */
  312 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
  313               (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
  314 
  315 #ifdef UPCALL_TIMING
  316 #define UPCALL_MAX      50
  317 static u_long upcall_data[UPCALL_MAX + 1];
  318 static void collate();
  319 #endif /* UPCALL_TIMING */
  320 
  321 static int ip6_mrouter_init(struct socket *, int, int);
  322 static int add_m6fc(struct mf6cctl *);
  323 static int add_m6if(struct mif6ctl *);
  324 static int del_m6fc(struct mf6cctl *);
  325 static int del_m6if(mifi_t *);
  326 static int del_m6if_locked(mifi_t *);
  327 static int get_mif6_cnt(struct sioc_mif_req6 *);
  328 static int get_sg_cnt(struct sioc_sg_req6 *);
  329 
  330 static struct callout expire_upcalls_ch;
  331 
  332 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
  333 int X_ip6_mrouter_done(void);
  334 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
  335 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
  336 int X_mrt6_ioctl(u_long, caddr_t);
  337 
  338 /*
  339  * Handle MRT setsockopt commands to modify the multicast routing tables.
  340  */
  341 int
  342 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
  343 {
  344         int error = 0;
  345         int optval;
  346         struct mif6ctl mifc;
  347         struct mf6cctl mfcc;
  348         mifi_t mifi;
  349 
  350         if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
  351                 return (EACCES);
  352 
  353         switch (sopt->sopt_name) {
  354         case MRT6_INIT:
  355 #ifdef MRT6_OINIT
  356         case MRT6_OINIT:
  357 #endif
  358                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  359                     sizeof(optval));
  360                 if (error)
  361                         break;
  362                 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
  363                 break;
  364         case MRT6_DONE:
  365                 error = X_ip6_mrouter_done();
  366                 break;
  367         case MRT6_ADD_MIF:
  368                 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
  369                 if (error)
  370                         break;
  371                 error = add_m6if(&mifc);
  372                 break;
  373         case MRT6_ADD_MFC:
  374                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  375                 if (error)
  376                         break;
  377                 error = add_m6fc(&mfcc);
  378                 break;
  379         case MRT6_DEL_MFC:
  380                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  381                 if (error)
  382                         break;
  383                 error = del_m6fc(&mfcc);
  384                 break;
  385         case MRT6_DEL_MIF:
  386                 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
  387                 if (error)
  388                         break;
  389                 error = del_m6if(&mifi);
  390                 break;
  391         case MRT6_PIM:
  392                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  393                     sizeof(optval));
  394                 if (error)
  395                         break;
  396                 error = set_pim6(&optval);
  397                 break;
  398         default:
  399                 error = EOPNOTSUPP;
  400                 break;
  401         }
  402 
  403         return (error);
  404 }
  405 
  406 /*
  407  * Handle MRT getsockopt commands
  408  */
  409 int
  410 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
  411 {
  412         int error = 0;
  413 
  414         if (so != V_ip6_mrouter)
  415                 return (EACCES);
  416 
  417         switch (sopt->sopt_name) {
  418                 case MRT6_PIM:
  419                         error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
  420                         break;
  421         }
  422         return (error);
  423 }
  424 
  425 /*
  426  * Handle ioctl commands to obtain information from the cache
  427  */
  428 int
  429 X_mrt6_ioctl(u_long cmd, caddr_t data)
  430 {
  431         int ret;
  432 
  433         ret = EINVAL;
  434 
  435         switch (cmd) {
  436         case SIOCGETSGCNT_IN6:
  437                 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
  438                 break;
  439 
  440         case SIOCGETMIFCNT_IN6:
  441                 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
  442                 break;
  443 
  444         default:
  445                 break;
  446         }
  447 
  448         return (ret);
  449 }
  450 
  451 /*
  452  * returns the packet, byte, rpf-failure count for the source group provided
  453  */
  454 static int
  455 get_sg_cnt(struct sioc_sg_req6 *req)
  456 {
  457         struct mf6c *rt;
  458         int ret;
  459 
  460         ret = 0;
  461 
  462         MFC6_LOCK();
  463 
  464         MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
  465         if (rt == NULL) {
  466                 ret = ESRCH;
  467         } else {
  468                 req->pktcnt = rt->mf6c_pkt_cnt;
  469                 req->bytecnt = rt->mf6c_byte_cnt;
  470                 req->wrong_if = rt->mf6c_wrong_if;
  471         }
  472 
  473         MFC6_UNLOCK();
  474 
  475         return (ret);
  476 }
  477 
  478 /*
  479  * returns the input and output packet and byte counts on the mif provided
  480  */
  481 static int
  482 get_mif6_cnt(struct sioc_mif_req6 *req)
  483 {
  484         mifi_t mifi;
  485         int ret;
  486 
  487         ret = 0;
  488         mifi = req->mifi;
  489 
  490         MIF6_LOCK();
  491 
  492         if (mifi >= nummifs) {
  493                 ret = EINVAL;
  494         } else {
  495                 req->icount = mif6table[mifi].m6_pkt_in;
  496                 req->ocount = mif6table[mifi].m6_pkt_out;
  497                 req->ibytes = mif6table[mifi].m6_bytes_in;
  498                 req->obytes = mif6table[mifi].m6_bytes_out;
  499         }
  500 
  501         MIF6_UNLOCK();
  502 
  503         return (ret);
  504 }
  505 
  506 static int
  507 set_pim6(int *i)
  508 {
  509         if ((*i != 1) && (*i != 0))
  510                 return (EINVAL);
  511 
  512         V_pim6 = *i;
  513 
  514         return (0);
  515 }
  516 
  517 /*
  518  * Enable multicast routing
  519  */
  520 static int
  521 ip6_mrouter_init(struct socket *so, int v, int cmd)
  522 {
  523 
  524 #ifdef MRT6DEBUG
  525         if (V_mrt6debug)
  526                 log(LOG_DEBUG,
  527                     "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
  528                     so->so_type, so->so_proto->pr_protocol);
  529 #endif
  530 
  531         if (so->so_type != SOCK_RAW ||
  532             so->so_proto->pr_protocol != IPPROTO_ICMPV6)
  533                 return (EOPNOTSUPP);
  534 
  535         if (v != 1)
  536                 return (ENOPROTOOPT);
  537 
  538         MROUTER6_LOCK();
  539 
  540         if (V_ip6_mrouter != NULL) {
  541                 MROUTER6_UNLOCK();
  542                 return (EADDRINUSE);
  543         }
  544 
  545         V_ip6_mrouter = so;
  546         V_ip6_mrouter_ver = cmd;
  547 
  548         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  549         bzero((caddr_t)n6expire, sizeof(n6expire));
  550 
  551         V_pim6 = 0;/* used for stubbing out/in pim stuff */
  552 
  553         callout_init(&expire_upcalls_ch, 0);
  554         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
  555             expire_upcalls, NULL);
  556 
  557         MROUTER6_UNLOCK();
  558 
  559 #ifdef MRT6DEBUG
  560         if (V_mrt6debug)
  561                 log(LOG_DEBUG, "ip6_mrouter_init\n");
  562 #endif
  563 
  564         return (0);
  565 }
  566 
  567 /*
  568  * Disable IPv6 multicast forwarding.
  569  */
  570 int
  571 X_ip6_mrouter_done(void)
  572 {
  573         mifi_t mifi;
  574         int i;
  575         struct mf6c *rt;
  576         struct rtdetq *rte;
  577 
  578         MROUTER6_LOCK();
  579 
  580         if (V_ip6_mrouter == NULL) {
  581                 MROUTER6_UNLOCK();
  582                 return (EINVAL);
  583         }
  584 
  585         /*
  586          * For each phyint in use, disable promiscuous reception of all IPv6
  587          * multicasts.
  588          */
  589         for (mifi = 0; mifi < nummifs; mifi++) {
  590                 if (mif6table[mifi].m6_ifp &&
  591                     !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
  592                         if_allmulti(mif6table[mifi].m6_ifp, 0);
  593                 }
  594         }
  595         bzero((caddr_t)mif6table, sizeof(mif6table));
  596         nummifs = 0;
  597 
  598         V_pim6 = 0; /* used to stub out/in pim specific code */
  599 
  600         callout_stop(&expire_upcalls_ch);
  601 
  602         /*
  603          * Free all multicast forwarding cache entries.
  604          */
  605         MFC6_LOCK();
  606         for (i = 0; i < MF6CTBLSIZ; i++) {
  607                 rt = mf6ctable[i];
  608                 while (rt) {
  609                         struct mf6c *frt;
  610 
  611                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  612                                 struct rtdetq *n = rte->next;
  613 
  614                                 m_free(rte->m);
  615                                 free(rte, M_MRTABLE6);
  616                                 rte = n;
  617                         }
  618                         frt = rt;
  619                         rt = rt->mf6c_next;
  620                         free(frt, M_MRTABLE6);
  621                 }
  622         }
  623         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  624         MFC6_UNLOCK();
  625 
  626         /*
  627          * Reset register interface
  628          */
  629         if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
  630                 if_detach(multicast_register_if6);
  631                 if_free(multicast_register_if6);
  632                 reg_mif_num = (mifi_t)-1;
  633                 multicast_register_if6 = NULL;
  634         }
  635 
  636         V_ip6_mrouter = NULL;
  637         V_ip6_mrouter_ver = 0;
  638 
  639         MROUTER6_UNLOCK();
  640 
  641 #ifdef MRT6DEBUG
  642         if (V_mrt6debug)
  643                 log(LOG_DEBUG, "ip6_mrouter_done\n");
  644 #endif
  645 
  646         return (0);
  647 }
  648 
  649 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
  650 
  651 /*
  652  * Add a mif to the mif table
  653  */
  654 static int
  655 add_m6if(struct mif6ctl *mifcp)
  656 {
  657         struct mif6 *mifp;
  658         struct ifnet *ifp;
  659         int error;
  660 
  661         MIF6_LOCK();
  662 
  663         if (mifcp->mif6c_mifi >= MAXMIFS) {
  664                 MIF6_UNLOCK();
  665                 return (EINVAL);
  666         }
  667         mifp = mif6table + mifcp->mif6c_mifi;
  668         if (mifp->m6_ifp != NULL) {
  669                 MIF6_UNLOCK();
  670                 return (EADDRINUSE); /* XXX: is it appropriate? */
  671         }
  672         if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
  673                 MIF6_UNLOCK();
  674                 return (ENXIO);
  675         }
  676 
  677         ifp = ifnet_byindex(mifcp->mif6c_pifi);
  678 
  679         if (mifcp->mif6c_flags & MIFF_REGISTER) {
  680                 if (reg_mif_num == (mifi_t)-1) {
  681                         ifp = if_alloc(IFT_OTHER);
  682 
  683                         if_initname(ifp, "register_mif", 0);
  684                         ifp->if_flags |= IFF_LOOPBACK;
  685                         if_attach(ifp);
  686                         multicast_register_if6 = ifp;
  687                         reg_mif_num = mifcp->mif6c_mifi;
  688                         /*
  689                          * it is impossible to guess the ifindex of the
  690                          * register interface.  So mif6c_pifi is automatically
  691                          * calculated.
  692                          */
  693                         mifcp->mif6c_pifi = ifp->if_index;
  694                 } else {
  695                         ifp = multicast_register_if6;
  696                 }
  697         } else {
  698                 /* Make sure the interface supports multicast */
  699                 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
  700                         MIF6_UNLOCK();
  701                         return (EOPNOTSUPP);
  702                 }
  703 
  704                 error = if_allmulti(ifp, 1);
  705                 if (error) {
  706                         MIF6_UNLOCK();
  707                         return (error);
  708                 }
  709         }
  710 
  711         mifp->m6_flags     = mifcp->mif6c_flags;
  712         mifp->m6_ifp       = ifp;
  713 
  714         /* initialize per mif pkt counters */
  715         mifp->m6_pkt_in    = 0;
  716         mifp->m6_pkt_out   = 0;
  717         mifp->m6_bytes_in  = 0;
  718         mifp->m6_bytes_out = 0;
  719         bzero(&mifp->m6_route, sizeof(mifp->m6_route));
  720 
  721         /* Adjust nummifs up if the mifi is higher than nummifs */
  722         if (nummifs <= mifcp->mif6c_mifi)
  723                 nummifs = mifcp->mif6c_mifi + 1;
  724 
  725         MIF6_UNLOCK();
  726 
  727 #ifdef MRT6DEBUG
  728         if (V_mrt6debug)
  729                 log(LOG_DEBUG,
  730                     "add_mif #%d, phyint %s\n",
  731                     mifcp->mif6c_mifi,
  732                     ifp->if_xname);
  733 #endif
  734 
  735         return (0);
  736 }
  737 
  738 /*
  739  * Delete a mif from the mif table
  740  */
  741 static int
  742 del_m6if_locked(mifi_t *mifip)
  743 {
  744         struct mif6 *mifp = mif6table + *mifip;
  745         mifi_t mifi;
  746         struct ifnet *ifp;
  747 
  748         MIF6_LOCK_ASSERT();
  749 
  750         if (*mifip >= nummifs)
  751                 return (EINVAL);
  752         if (mifp->m6_ifp == NULL)
  753                 return (EINVAL);
  754 
  755         if (!(mifp->m6_flags & MIFF_REGISTER)) {
  756                 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
  757                 ifp = mifp->m6_ifp;
  758                 if_allmulti(ifp, 0);
  759         } else {
  760                 if (reg_mif_num != (mifi_t)-1 &&
  761                     multicast_register_if6 != NULL) {
  762                         if_detach(multicast_register_if6);
  763                         if_free(multicast_register_if6);
  764                         reg_mif_num = (mifi_t)-1;
  765                         multicast_register_if6 = NULL;
  766                 }
  767         }
  768 
  769         bzero((caddr_t)mifp, sizeof(*mifp));
  770 
  771         /* Adjust nummifs down */
  772         for (mifi = nummifs; mifi > 0; mifi--)
  773                 if (mif6table[mifi - 1].m6_ifp)
  774                         break;
  775         nummifs = mifi;
  776 
  777 #ifdef MRT6DEBUG
  778         if (V_mrt6debug)
  779                 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
  780 #endif
  781 
  782         return (0);
  783 }
  784 
  785 static int
  786 del_m6if(mifi_t *mifip)
  787 {
  788         int cc;
  789 
  790         MIF6_LOCK();
  791         cc = del_m6if_locked(mifip);
  792         MIF6_UNLOCK();
  793 
  794         return (cc);
  795 }
  796 
  797 /*
  798  * Add an mfc entry
  799  */
  800 static int
  801 add_m6fc(struct mf6cctl *mfccp)
  802 {
  803         struct mf6c *rt;
  804         u_long hash;
  805         struct rtdetq *rte;
  806         u_short nstl;
  807         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  808 
  809         MFC6_LOCK();
  810 
  811         MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
  812                  mfccp->mf6cc_mcastgrp.sin6_addr, rt);
  813 
  814         /* If an entry already exists, just update the fields */
  815         if (rt) {
  816 #ifdef MRT6DEBUG
  817                 if (V_mrt6debug & DEBUG_MFC) {
  818                     log(LOG_DEBUG,
  819                         "add_m6fc no upcall h %d o %s g %s p %x\n",
  820                         ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  821                         ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  822                         mfccp->mf6cc_parent);
  823                 }
  824 #endif
  825 
  826                 rt->mf6c_parent = mfccp->mf6cc_parent;
  827                 rt->mf6c_ifset = mfccp->mf6cc_ifset;
  828 
  829                 MFC6_UNLOCK();
  830                 return (0);
  831         }
  832 
  833         /*
  834          * Find the entry for which the upcall was made and update
  835          */
  836         hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
  837                         mfccp->mf6cc_mcastgrp.sin6_addr);
  838         for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
  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                     (rt->mf6c_stall != NULL)) {
  844 
  845                         if (nstl++)
  846                                 log(LOG_ERR,
  847                                     "add_m6fc: %s o %s g %s p %x dbx %p\n",
  848                                     "multiple kernel entries",
  849                                     ip6_sprintf(ip6bufo,
  850                                             &mfccp->mf6cc_origin.sin6_addr),
  851                                     ip6_sprintf(ip6bufg,
  852                                             &mfccp->mf6cc_mcastgrp.sin6_addr),
  853                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  854 
  855 #ifdef MRT6DEBUG
  856                         if (V_mrt6debug & DEBUG_MFC)
  857                                 log(LOG_DEBUG,
  858                                     "add_m6fc o %s g %s p %x dbg %x\n",
  859                                     ip6_sprintf(ip6bufo,
  860                                             &mfccp->mf6cc_origin.sin6_addr),
  861                                     ip6_sprintf(ip6bufg,
  862                                             &mfccp->mf6cc_mcastgrp.sin6_addr),
  863                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  864 #endif
  865 
  866                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  867                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  868                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  869                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  870                         /* initialize pkt counters per src-grp */
  871                         rt->mf6c_pkt_cnt    = 0;
  872                         rt->mf6c_byte_cnt   = 0;
  873                         rt->mf6c_wrong_if   = 0;
  874 
  875                         rt->mf6c_expire = 0;    /* Don't clean this guy up */
  876                         n6expire[hash]--;
  877 
  878                         /* free packets Qed at the end of this entry */
  879                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  880                                 struct rtdetq *n = rte->next;
  881                                 ip6_mdq(rte->m, rte->ifp, rt);
  882                                 m_freem(rte->m);
  883 #ifdef UPCALL_TIMING
  884                                 collate(&(rte->t));
  885 #endif /* UPCALL_TIMING */
  886                                 free(rte, M_MRTABLE6);
  887                                 rte = n;
  888                         }
  889                         rt->mf6c_stall = NULL;
  890                 }
  891         }
  892 
  893         /*
  894          * It is possible that an entry is being inserted without an upcall
  895          */
  896         if (nstl == 0) {
  897 #ifdef MRT6DEBUG
  898                 if (V_mrt6debug & DEBUG_MFC)
  899                     log(LOG_DEBUG,
  900                         "add_mfc no upcall h %d o %s g %s p %x\n",
  901                         hash,
  902                         ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  903                         ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  904                         mfccp->mf6cc_parent);
  905 #endif
  906 
  907                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
  908 
  909                         if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  910                                                &mfccp->mf6cc_origin.sin6_addr)&&
  911                             IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  912                                                &mfccp->mf6cc_mcastgrp.sin6_addr)) {
  913 
  914                                 rt->mf6c_origin     = mfccp->mf6cc_origin;
  915                                 rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  916                                 rt->mf6c_parent     = mfccp->mf6cc_parent;
  917                                 rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  918                                 /* initialize pkt counters per src-grp */
  919                                 rt->mf6c_pkt_cnt    = 0;
  920                                 rt->mf6c_byte_cnt   = 0;
  921                                 rt->mf6c_wrong_if   = 0;
  922 
  923                                 if (rt->mf6c_expire)
  924                                         n6expire[hash]--;
  925                                 rt->mf6c_expire    = 0;
  926                         }
  927                 }
  928                 if (rt == NULL) {
  929                         /* no upcall, so make a new entry */
  930                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
  931                                                   M_NOWAIT);
  932                         if (rt == NULL) {
  933                                 MFC6_UNLOCK();
  934                                 return (ENOBUFS);
  935                         }
  936 
  937                         /* insert new entry at head of hash chain */
  938                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  939                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  940                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  941                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  942                         /* initialize pkt counters per src-grp */
  943                         rt->mf6c_pkt_cnt    = 0;
  944                         rt->mf6c_byte_cnt   = 0;
  945                         rt->mf6c_wrong_if   = 0;
  946                         rt->mf6c_expire     = 0;
  947                         rt->mf6c_stall = NULL;
  948 
  949                         /* link into table */
  950                         rt->mf6c_next  = mf6ctable[hash];
  951                         mf6ctable[hash] = rt;
  952                 }
  953         }
  954 
  955         MFC6_UNLOCK();
  956         return (0);
  957 }
  958 
  959 #ifdef UPCALL_TIMING
  960 /*
  961  * collect delay statistics on the upcalls
  962  */
  963 static void
  964 collate(struct timeval *t)
  965 {
  966         u_long d;
  967         struct timeval tp;
  968         u_long delta;
  969 
  970         GET_TIME(tp);
  971 
  972         if (TV_LT(*t, tp))
  973         {
  974                 TV_DELTA(tp, *t, delta);
  975 
  976                 d = delta >> 10;
  977                 if (d > UPCALL_MAX)
  978                         d = UPCALL_MAX;
  979 
  980                 ++upcall_data[d];
  981         }
  982 }
  983 #endif /* UPCALL_TIMING */
  984 
  985 /*
  986  * Delete an mfc entry
  987  */
  988 static int
  989 del_m6fc(struct mf6cctl *mfccp)
  990 {
  991         struct sockaddr_in6     origin;
  992         struct sockaddr_in6     mcastgrp;
  993         struct mf6c             *rt;
  994         struct mf6c             **nptr;
  995         u_long          hash;
  996 
  997         origin = mfccp->mf6cc_origin;
  998         mcastgrp = mfccp->mf6cc_mcastgrp;
  999         hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
 1000 
 1001 #ifdef MRT6DEBUG
 1002         if (V_mrt6debug & DEBUG_MFC) {
 1003                 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
 1004                 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
 1005                     ip6_sprintf(ip6bufo, &origin.sin6_addr),
 1006                     ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
 1007         }
 1008 #endif
 1009 
 1010         MFC6_LOCK();
 1011 
 1012         nptr = &mf6ctable[hash];
 1013         while ((rt = *nptr) != NULL) {
 1014                 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
 1015                                        &rt->mf6c_origin.sin6_addr) &&
 1016                     IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
 1017                                        &rt->mf6c_mcastgrp.sin6_addr) &&
 1018                     rt->mf6c_stall == NULL)
 1019                         break;
 1020 
 1021                 nptr = &rt->mf6c_next;
 1022         }
 1023         if (rt == NULL) {
 1024                 MFC6_UNLOCK();
 1025                 return (EADDRNOTAVAIL);
 1026         }
 1027 
 1028         *nptr = rt->mf6c_next;
 1029         free(rt, M_MRTABLE6);
 1030 
 1031         MFC6_UNLOCK();
 1032 
 1033         return (0);
 1034 }
 1035 
 1036 static int
 1037 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
 1038 {
 1039 
 1040         if (s) {
 1041                 if (sbappendaddr(&s->so_rcv,
 1042                                  (struct sockaddr *)src,
 1043                                  mm, (struct mbuf *)0) != 0) {
 1044                         sorwakeup(s);
 1045                         return (0);
 1046                 }
 1047         }
 1048         m_freem(mm);
 1049         return (-1);
 1050 }
 1051 
 1052 /*
 1053  * IPv6 multicast forwarding function. This function assumes that the packet
 1054  * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
 1055  * pointed to by "ifp", and the packet is to be relayed to other networks
 1056  * that have members of the packet's destination IPv6 multicast group.
 1057  *
 1058  * The packet is returned unscathed to the caller, unless it is
 1059  * erroneous, in which case a non-zero return value tells the caller to
 1060  * discard it.
 1061  *
 1062  * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
 1063  * this function is called in the originating context (i.e., not when
 1064  * forwarding a packet from other node).  ip6_output(), which is currently the
 1065  * only function that calls this function is called in the originating context,
 1066  * explicitly ensures this condition.  It is caller's responsibility to ensure
 1067  * that if this function is called from somewhere else in the originating
 1068  * context in the future.
 1069  */
 1070 int
 1071 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
 1072 {
 1073         struct mf6c *rt;
 1074         struct mif6 *mifp;
 1075         struct mbuf *mm;
 1076         mifi_t mifi;
 1077         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1078 
 1079 #ifdef MRT6DEBUG
 1080         if (V_mrt6debug & DEBUG_FORWARD)
 1081                 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
 1082                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1083                     ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1084                     ifp->if_index);
 1085 #endif
 1086 
 1087         /*
 1088          * Don't forward a packet with Hop limit of zero or one,
 1089          * or a packet destined to a local-only group.
 1090          */
 1091         if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
 1092             IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
 1093                 return (0);
 1094         ip6->ip6_hlim--;
 1095 
 1096         /*
 1097          * Source address check: do not forward packets with unspecified
 1098          * source. It was discussed in July 2000, on ipngwg mailing list.
 1099          * This is rather more serious than unicast cases, because some
 1100          * MLD packets can be sent with the unspecified source address
 1101          * (although such packets must normally set 1 to the hop limit field).
 1102          */
 1103         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
 1104                 V_ip6stat.ip6s_cantforward++;
 1105                 if (V_ip6_log_time + V_ip6_log_interval < time_second) {
 1106                         V_ip6_log_time = time_second;
 1107                         log(LOG_DEBUG,
 1108                             "cannot forward "
 1109                             "from %s to %s nxt %d received on %s\n",
 1110                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1111                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1112                             ip6->ip6_nxt,
 1113                             if_name(m->m_pkthdr.rcvif));
 1114                 }
 1115                 return (0);
 1116         }
 1117 
 1118         MFC6_LOCK();
 1119 
 1120         /*
 1121          * Determine forwarding mifs from the forwarding cache table
 1122          */
 1123         MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
 1124 
 1125         /* Entry exists, so forward if necessary */
 1126         if (rt) {
 1127                 MFC6_UNLOCK();
 1128                 return (ip6_mdq(m, ifp, rt));
 1129         } else {
 1130                 /*
 1131                  * If we don't have a route for packet's origin,
 1132                  * Make a copy of the packet &
 1133                  * send message to routing daemon
 1134                  */
 1135 
 1136                 struct mbuf *mb0;
 1137                 struct rtdetq *rte;
 1138                 u_long hash;
 1139 /*              int i, npkts;*/
 1140 #ifdef UPCALL_TIMING
 1141                 struct timeval tp;
 1142 
 1143                 GET_TIME(tp);
 1144 #endif /* UPCALL_TIMING */
 1145 
 1146                 mrt6stat.mrt6s_no_route++;
 1147 #ifdef MRT6DEBUG
 1148                 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
 1149                         log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
 1150                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1151                             ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1152 #endif
 1153 
 1154                 /*
 1155                  * Allocate mbufs early so that we don't do extra work if we
 1156                  * are just going to fail anyway.
 1157                  */
 1158                 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6,
 1159                                               M_NOWAIT);
 1160                 if (rte == NULL) {
 1161                         MFC6_UNLOCK();
 1162                         return (ENOBUFS);
 1163                 }
 1164                 mb0 = m_copy(m, 0, M_COPYALL);
 1165                 /*
 1166                  * Pullup packet header if needed before storing it,
 1167                  * as other references may modify it in the meantime.
 1168                  */
 1169                 if (mb0 &&
 1170                     (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
 1171                         mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
 1172                 if (mb0 == NULL) {
 1173                         free(rte, M_MRTABLE6);
 1174                         MFC6_UNLOCK();
 1175                         return (ENOBUFS);
 1176                 }
 1177 
 1178                 /* is there an upcall waiting for this packet? */
 1179                 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
 1180                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
 1181                         if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
 1182                                                &rt->mf6c_origin.sin6_addr) &&
 1183                             IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
 1184                                                &rt->mf6c_mcastgrp.sin6_addr) &&
 1185                             (rt->mf6c_stall != NULL))
 1186                                 break;
 1187                 }
 1188 
 1189                 if (rt == NULL) {
 1190                         struct mrt6msg *im;
 1191 #ifdef MRT6_OINIT
 1192                         struct omrt6msg *oim;
 1193 #endif
 1194 
 1195                         /* no upcall, so make a new entry */
 1196                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
 1197                                                   M_NOWAIT);
 1198                         if (rt == NULL) {
 1199                                 free(rte, M_MRTABLE6);
 1200                                 m_freem(mb0);
 1201                                 MFC6_UNLOCK();
 1202                                 return (ENOBUFS);
 1203                         }
 1204                         /*
 1205                          * Make a copy of the header to send to the user
 1206                          * level process
 1207                          */
 1208                         mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
 1209 
 1210                         if (mm == NULL) {
 1211                                 free(rte, M_MRTABLE6);
 1212                                 m_freem(mb0);
 1213                                 free(rt, M_MRTABLE6);
 1214                                 MFC6_UNLOCK();
 1215                                 return (ENOBUFS);
 1216                         }
 1217 
 1218                         /*
 1219                          * Send message to routing daemon
 1220                          */
 1221                         sin6.sin6_addr = ip6->ip6_src;
 1222 
 1223                         im = NULL;
 1224 #ifdef MRT6_OINIT
 1225                         oim = NULL;
 1226 #endif
 1227                         switch (V_ip6_mrouter_ver) {
 1228 #ifdef MRT6_OINIT
 1229                         case MRT6_OINIT:
 1230                                 oim = mtod(mm, struct omrt6msg *);
 1231                                 oim->im6_msgtype = MRT6MSG_NOCACHE;
 1232                                 oim->im6_mbz = 0;
 1233                                 break;
 1234 #endif
 1235                         case MRT6_INIT:
 1236                                 im = mtod(mm, struct mrt6msg *);
 1237                                 im->im6_msgtype = MRT6MSG_NOCACHE;
 1238                                 im->im6_mbz = 0;
 1239                                 break;
 1240                         default:
 1241                                 free(rte, M_MRTABLE6);
 1242                                 m_freem(mb0);
 1243                                 free(rt, M_MRTABLE6);
 1244                                 MFC6_UNLOCK();
 1245                                 return (EINVAL);
 1246                         }
 1247 
 1248 #ifdef MRT6DEBUG
 1249                         if (V_mrt6debug & DEBUG_FORWARD)
 1250                                 log(LOG_DEBUG,
 1251                                     "getting the iif info in the kernel\n");
 1252 #endif
 1253 
 1254                         for (mifp = mif6table, mifi = 0;
 1255                              mifi < nummifs && mifp->m6_ifp != ifp;
 1256                              mifp++, mifi++)
 1257                                 ;
 1258 
 1259                         switch (V_ip6_mrouter_ver) {
 1260 #ifdef MRT6_OINIT
 1261                         case MRT6_OINIT:
 1262                                 oim->im6_mif = mifi;
 1263                                 break;
 1264 #endif
 1265                         case MRT6_INIT:
 1266                                 im->im6_mif = mifi;
 1267                                 break;
 1268                         }
 1269 
 1270                         if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1271                                 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
 1272                                     "socket queue full\n");
 1273                                 mrt6stat.mrt6s_upq_sockfull++;
 1274                                 free(rte, M_MRTABLE6);
 1275                                 m_freem(mb0);
 1276                                 free(rt, M_MRTABLE6);
 1277                                 MFC6_UNLOCK();
 1278                                 return (ENOBUFS);
 1279                         }
 1280 
 1281                         mrt6stat.mrt6s_upcalls++;
 1282 
 1283                         /* insert new entry at head of hash chain */
 1284                         bzero(rt, sizeof(*rt));
 1285                         rt->mf6c_origin.sin6_family = AF_INET6;
 1286                         rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
 1287                         rt->mf6c_origin.sin6_addr = ip6->ip6_src;
 1288                         rt->mf6c_mcastgrp.sin6_family = AF_INET6;
 1289                         rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
 1290                         rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
 1291                         rt->mf6c_expire = UPCALL_EXPIRE;
 1292                         n6expire[hash]++;
 1293                         rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
 1294 
 1295                         /* link into table */
 1296                         rt->mf6c_next  = mf6ctable[hash];
 1297                         mf6ctable[hash] = rt;
 1298                         /* Add this entry to the end of the queue */
 1299                         rt->mf6c_stall = rte;
 1300                 } else {
 1301                         /* determine if q has overflowed */
 1302                         struct rtdetq **p;
 1303                         int npkts = 0;
 1304 
 1305                         for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
 1306                                 if (++npkts > MAX_UPQ6) {
 1307                                         mrt6stat.mrt6s_upq_ovflw++;
 1308                                         free(rte, M_MRTABLE6);
 1309                                         m_freem(mb0);
 1310                                         MFC6_UNLOCK();
 1311                                         return (0);
 1312                                 }
 1313 
 1314                         /* Add this entry to the end of the queue */
 1315                         *p = rte;
 1316                 }
 1317 
 1318                 rte->next = NULL;
 1319                 rte->m = mb0;
 1320                 rte->ifp = ifp;
 1321 #ifdef UPCALL_TIMING
 1322                 rte->t = tp;
 1323 #endif /* UPCALL_TIMING */
 1324 
 1325                 MFC6_UNLOCK();
 1326 
 1327                 return (0);
 1328         }
 1329 }
 1330 
 1331 /*
 1332  * Clean up cache entries if upcalls are not serviced
 1333  * Call from the Slow Timeout mechanism, every half second.
 1334  */
 1335 static void
 1336 expire_upcalls(void *unused)
 1337 {
 1338         struct rtdetq *rte;
 1339         struct mf6c *mfc, **nptr;
 1340         int i;
 1341 
 1342         MFC6_LOCK();
 1343         for (i = 0; i < MF6CTBLSIZ; i++) {
 1344                 if (n6expire[i] == 0)
 1345                         continue;
 1346                 nptr = &mf6ctable[i];
 1347                 while ((mfc = *nptr) != NULL) {
 1348                         rte = mfc->mf6c_stall;
 1349                         /*
 1350                          * Skip real cache entries
 1351                          * Make sure it wasn't marked to not expire (shouldn't happen)
 1352                          * If it expires now
 1353                          */
 1354                         if (rte != NULL &&
 1355                             mfc->mf6c_expire != 0 &&
 1356                             --mfc->mf6c_expire == 0) {
 1357 #ifdef MRT6DEBUG
 1358                                 if (V_mrt6debug & DEBUG_EXPIRE) {
 1359                                         char ip6bufo[INET6_ADDRSTRLEN];
 1360                                         char ip6bufg[INET6_ADDRSTRLEN];
 1361                                         log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
 1362                                             ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
 1363                                             ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
 1364                                 }
 1365 #endif
 1366                                 /*
 1367                                  * drop all the packets
 1368                                  * free the mbuf with the pkt, if, timing info
 1369                                  */
 1370                                 do {
 1371                                         struct rtdetq *n = rte->next;
 1372                                         m_freem(rte->m);
 1373                                         free(rte, M_MRTABLE6);
 1374                                         rte = n;
 1375                                 } while (rte != NULL);
 1376                                 mrt6stat.mrt6s_cache_cleanups++;
 1377                                 n6expire[i]--;
 1378 
 1379                                 *nptr = mfc->mf6c_next;
 1380                                 free(mfc, M_MRTABLE6);
 1381                         } else {
 1382                                 nptr = &mfc->mf6c_next;
 1383                         }
 1384                 }
 1385         }
 1386         MFC6_UNLOCK();
 1387         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
 1388             expire_upcalls, NULL);
 1389 }
 1390 
 1391 /*
 1392  * Packet forwarding routine once entry in the cache is made
 1393  */
 1394 static int
 1395 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
 1396 {
 1397         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1398         mifi_t mifi, iif;
 1399         struct mif6 *mifp;
 1400         int plen = m->m_pkthdr.len;
 1401         struct in6_addr src0, dst0; /* copies for local work */
 1402         u_int32_t iszone, idzone, oszone, odzone;
 1403         int error = 0;
 1404 
 1405 /*
 1406  * Macro to send packet on mif.  Since RSVP packets don't get counted on
 1407  * input, they shouldn't get counted on output, so statistics keeping is
 1408  * separate.
 1409  */
 1410 
 1411 #define MC6_SEND(ip6, mifp, m) do {                             \
 1412         if ((mifp)->m6_flags & MIFF_REGISTER)                   \
 1413                 register_send((ip6), (mifp), (m));              \
 1414         else                                                    \
 1415                 phyint_send((ip6), (mifp), (m));                \
 1416 } while (/*CONSTCOND*/ 0)
 1417 
 1418         /*
 1419          * Don't forward if it didn't arrive from the parent mif
 1420          * for its origin.
 1421          */
 1422         mifi = rt->mf6c_parent;
 1423         if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
 1424                 /* came in the wrong interface */
 1425 #ifdef MRT6DEBUG
 1426                 if (V_mrt6debug & DEBUG_FORWARD)
 1427                         log(LOG_DEBUG,
 1428                             "wrong if: ifid %d mifi %d mififid %x\n",
 1429                             ifp->if_index, mifi,
 1430                             mif6table[mifi].m6_ifp->if_index);
 1431 #endif
 1432                 mrt6stat.mrt6s_wrong_if++;
 1433                 rt->mf6c_wrong_if++;
 1434                 /*
 1435                  * If we are doing PIM processing, and we are forwarding
 1436                  * packets on this interface, send a message to the
 1437                  * routing daemon.
 1438                  */
 1439                 /* have to make sure this is a valid mif */
 1440                 if (mifi < nummifs && mif6table[mifi].m6_ifp)
 1441                         if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
 1442                                 /*
 1443                                  * Check the M_LOOP flag to avoid an
 1444                                  * unnecessary PIM assert.
 1445                                  * XXX: M_LOOP is an ad-hoc hack...
 1446                                  */
 1447                                 static struct sockaddr_in6 sin6 =
 1448                                 { sizeof(sin6), AF_INET6 };
 1449 
 1450                                 struct mbuf *mm;
 1451                                 struct mrt6msg *im;
 1452 #ifdef MRT6_OINIT
 1453                                 struct omrt6msg *oim;
 1454 #endif
 1455 
 1456                                 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
 1457                                 if (mm &&
 1458                                     (M_HASCL(mm) ||
 1459                                      mm->m_len < sizeof(struct ip6_hdr)))
 1460                                         mm = m_pullup(mm, sizeof(struct ip6_hdr));
 1461                                 if (mm == NULL)
 1462                                         return (ENOBUFS);
 1463 
 1464 #ifdef MRT6_OINIT
 1465                                 oim = NULL;
 1466 #endif
 1467                                 im = NULL;
 1468                                 switch (V_ip6_mrouter_ver) {
 1469 #ifdef MRT6_OINIT
 1470                                 case MRT6_OINIT:
 1471                                         oim = mtod(mm, struct omrt6msg *);
 1472                                         oim->im6_msgtype = MRT6MSG_WRONGMIF;
 1473                                         oim->im6_mbz = 0;
 1474                                         break;
 1475 #endif
 1476                                 case MRT6_INIT:
 1477                                         im = mtod(mm, struct mrt6msg *);
 1478                                         im->im6_msgtype = MRT6MSG_WRONGMIF;
 1479                                         im->im6_mbz = 0;
 1480                                         break;
 1481                                 default:
 1482                                         m_freem(mm);
 1483                                         return (EINVAL);
 1484                                 }
 1485 
 1486                                 for (mifp = mif6table, iif = 0;
 1487                                      iif < nummifs && mifp &&
 1488                                              mifp->m6_ifp != ifp;
 1489                                      mifp++, iif++)
 1490                                         ;
 1491 
 1492                                 switch (V_ip6_mrouter_ver) {
 1493 #ifdef MRT6_OINIT
 1494                                 case MRT6_OINIT:
 1495                                         oim->im6_mif = iif;
 1496                                         sin6.sin6_addr = oim->im6_src;
 1497                                         break;
 1498 #endif
 1499                                 case MRT6_INIT:
 1500                                         im->im6_mif = iif;
 1501                                         sin6.sin6_addr = im->im6_src;
 1502                                         break;
 1503                                 }
 1504 
 1505                                 mrt6stat.mrt6s_upcalls++;
 1506 
 1507                                 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1508 #ifdef MRT6DEBUG
 1509                                         if (V_mrt6debug)
 1510                                                 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
 1511 #endif
 1512                                         ++mrt6stat.mrt6s_upq_sockfull;
 1513                                         return (ENOBUFS);
 1514                                 }       /* if socket Q full */
 1515                         }               /* if PIM */
 1516                 return (0);
 1517         }                       /* if wrong iif */
 1518 
 1519         /* If I sourced this packet, it counts as output, else it was input. */
 1520         if (m->m_pkthdr.rcvif == NULL) {
 1521                 /* XXX: is rcvif really NULL when output?? */
 1522                 mif6table[mifi].m6_pkt_out++;
 1523                 mif6table[mifi].m6_bytes_out += plen;
 1524         } else {
 1525                 mif6table[mifi].m6_pkt_in++;
 1526                 mif6table[mifi].m6_bytes_in += plen;
 1527         }
 1528         rt->mf6c_pkt_cnt++;
 1529         rt->mf6c_byte_cnt += plen;
 1530 
 1531         /*
 1532          * For each mif, forward a copy of the packet if there are group
 1533          * members downstream on the interface.
 1534          */
 1535         src0 = ip6->ip6_src;
 1536         dst0 = ip6->ip6_dst;
 1537         if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
 1538             (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
 1539                 V_ip6stat.ip6s_badscope++;
 1540                 return (error);
 1541         }
 1542         for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
 1543                 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
 1544                         /*
 1545                          * check if the outgoing packet is going to break
 1546                          * a scope boundary.
 1547                          * XXX For packets through PIM register tunnel
 1548                          * interface, we believe a routing daemon.
 1549                          */
 1550                         if (!(mif6table[rt->mf6c_parent].m6_flags &
 1551                               MIFF_REGISTER) &&
 1552                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
 1553                                 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
 1554                                     &oszone) ||
 1555                                     in6_setscope(&dst0, mif6table[mifi].m6_ifp,
 1556                                     &odzone) ||
 1557                                     iszone != oszone ||
 1558                                     idzone != odzone) {
 1559                                         V_ip6stat.ip6s_badscope++;
 1560                                         continue;
 1561                                 }
 1562                         }
 1563 
 1564                         mifp->m6_pkt_out++;
 1565                         mifp->m6_bytes_out += plen;
 1566                         MC6_SEND(ip6, mifp, m);
 1567                 }
 1568         }
 1569         return (0);
 1570 }
 1571 
 1572 static void
 1573 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
 1574 {
 1575         struct mbuf *mb_copy;
 1576         struct ifnet *ifp = mifp->m6_ifp;
 1577         int error = 0;
 1578         struct sockaddr_in6 *dst6;
 1579         u_long linkmtu;
 1580 
 1581         dst6 = &mifp->m6_route.ro_dst;
 1582 
 1583         /*
 1584          * Make a new reference to the packet; make sure that
 1585          * the IPv6 header is actually copied, not just referenced,
 1586          * so that ip6_output() only scribbles on the copy.
 1587          */
 1588         mb_copy = m_copy(m, 0, M_COPYALL);
 1589         if (mb_copy &&
 1590             (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
 1591                 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
 1592         if (mb_copy == NULL) {
 1593                 return;
 1594         }
 1595         /* set MCAST flag to the outgoing packet */
 1596         mb_copy->m_flags |= M_MCAST;
 1597 
 1598         /*
 1599          * If we sourced the packet, call ip6_output since we may devide
 1600          * the packet into fragments when the packet is too big for the
 1601          * outgoing interface.
 1602          * Otherwise, we can simply send the packet to the interface
 1603          * sending queue.
 1604          */
 1605         if (m->m_pkthdr.rcvif == NULL) {
 1606                 struct ip6_moptions im6o;
 1607 
 1608                 im6o.im6o_multicast_ifp = ifp;
 1609                 /* XXX: ip6_output will override ip6->ip6_hlim */
 1610                 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
 1611                 im6o.im6o_multicast_loop = 1;
 1612                 error = ip6_output(mb_copy, NULL, &mifp->m6_route,
 1613                                    IPV6_FORWARDING, &im6o, NULL, NULL);
 1614 
 1615 #ifdef MRT6DEBUG
 1616                 if (V_mrt6debug & DEBUG_XMIT)
 1617                         log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
 1618                             mifp - mif6table, error);
 1619 #endif
 1620                 return;
 1621         }
 1622 
 1623         /*
 1624          * If configured to loop back multicasts by default,
 1625          * loop back a copy now.
 1626          */
 1627         if (in6_mcast_loop) {
 1628                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1629                 dst6->sin6_family = AF_INET6;
 1630                 dst6->sin6_addr = ip6->ip6_dst;
 1631                 ip6_mloopback(ifp, m, &mifp->m6_route.ro_dst);
 1632         }
 1633 
 1634         /*
 1635          * Put the packet into the sending queue of the outgoing interface
 1636          * if it would fit in the MTU of the interface.
 1637          */
 1638         linkmtu = IN6_LINKMTU(ifp);
 1639         if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
 1640                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1641                 dst6->sin6_family = AF_INET6;
 1642                 dst6->sin6_addr = ip6->ip6_dst;
 1643                 /*
 1644                  * We just call if_output instead of nd6_output here, since
 1645                  * we need no ND for a multicast forwarded packet...right?
 1646                  */
 1647                 error = (*ifp->if_output)(ifp, mb_copy,
 1648                     (struct sockaddr *)&mifp->m6_route.ro_dst, NULL);
 1649 #ifdef MRT6DEBUG
 1650                 if (V_mrt6debug & DEBUG_XMIT)
 1651                         log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
 1652                             mifp - mif6table, error);
 1653 #endif
 1654         } else {
 1655                 /*
 1656                  * pMTU discovery is intentionally disabled by default, since
 1657                  * various router may notify pMTU in multicast, which can be
 1658                  * a DDoS to a router
 1659                  */
 1660                 if (V_ip6_mcast_pmtu)
 1661                         icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
 1662                 else {
 1663 #ifdef MRT6DEBUG
 1664                         if (V_mrt6debug & DEBUG_XMIT) {
 1665                                 char ip6bufs[INET6_ADDRSTRLEN];
 1666                                 char ip6bufd[INET6_ADDRSTRLEN];
 1667                                 log(LOG_DEBUG,
 1668                                     "phyint_send: packet too big on %s o %s "
 1669                                     "g %s size %d(discarded)\n",
 1670                                     if_name(ifp),
 1671                                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1672                                     ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1673                                     mb_copy->m_pkthdr.len);
 1674                         }
 1675 #endif /* MRT6DEBUG */
 1676                         m_freem(mb_copy); /* simply discard the packet */
 1677                 }
 1678         }
 1679 }
 1680 
 1681 static int
 1682 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
 1683 {
 1684         struct mbuf *mm;
 1685         int i, len = m->m_pkthdr.len;
 1686         static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
 1687         struct mrt6msg *im6;
 1688 
 1689 #ifdef MRT6DEBUG
 1690         if (V_mrt6debug) {
 1691                 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1692                 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
 1693                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1694                     ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1695         }
 1696 #endif
 1697         ++pim6stat.pim6s_snd_registers;
 1698 
 1699         /* Make a copy of the packet to send to the user level process */
 1700         MGETHDR(mm, M_DONTWAIT, MT_HEADER);
 1701         if (mm == NULL)
 1702                 return (ENOBUFS);
 1703         mm->m_pkthdr.rcvif = NULL;
 1704         mm->m_data += max_linkhdr;
 1705         mm->m_len = sizeof(struct ip6_hdr);
 1706 
 1707         if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
 1708                 m_freem(mm);
 1709                 return (ENOBUFS);
 1710         }
 1711         i = MHLEN - M_LEADINGSPACE(mm);
 1712         if (i > len)
 1713                 i = len;
 1714         mm = m_pullup(mm, i);
 1715         if (mm == NULL)
 1716                 return (ENOBUFS);
 1717 /* TODO: check it! */
 1718         mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
 1719 
 1720         /*
 1721          * Send message to routing daemon
 1722          */
 1723         sin6.sin6_addr = ip6->ip6_src;
 1724 
 1725         im6 = mtod(mm, struct mrt6msg *);
 1726         im6->im6_msgtype      = MRT6MSG_WHOLEPKT;
 1727         im6->im6_mbz          = 0;
 1728 
 1729         im6->im6_mif = mif - mif6table;
 1730 
 1731         /* iif info is not given for reg. encap.n */
 1732         mrt6stat.mrt6s_upcalls++;
 1733 
 1734         if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1735 #ifdef MRT6DEBUG
 1736                 if (V_mrt6debug)
 1737                         log(LOG_WARNING,
 1738                             "register_send: ip6_mrouter socket queue full\n");
 1739 #endif
 1740                 ++mrt6stat.mrt6s_upq_sockfull;
 1741                 return (ENOBUFS);
 1742         }
 1743         return (0);
 1744 }
 1745 
 1746 /*
 1747  * pim6_encapcheck() is called by the encap6_input() path at runtime to
 1748  * determine if a packet is for PIM; allowing PIM to be dynamically loaded
 1749  * into the kernel.
 1750  */
 1751 static int
 1752 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
 1753 {
 1754 
 1755 #ifdef DIAGNOSTIC
 1756     KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
 1757 #endif
 1758     if (proto != IPPROTO_PIM)
 1759         return 0;       /* not for us; reject the datagram. */
 1760 
 1761     return 64;          /* claim the datagram. */
 1762 }
 1763 
 1764 /*
 1765  * PIM sparse mode hook
 1766  * Receives the pim control messages, and passes them up to the listening
 1767  * socket, using rip6_input.
 1768  * The only message processed is the REGISTER pim message; the pim header
 1769  * is stripped off, and the inner packet is passed to register_mforward.
 1770  */
 1771 int
 1772 pim6_input(struct mbuf **mp, int *offp, int proto)
 1773 {
 1774         struct pim *pim; /* pointer to a pim struct */
 1775         struct ip6_hdr *ip6;
 1776         int pimlen;
 1777         struct mbuf *m = *mp;
 1778         int minlen;
 1779         int off = *offp;
 1780 
 1781         ++pim6stat.pim6s_rcv_total;
 1782 
 1783         ip6 = mtod(m, struct ip6_hdr *);
 1784         pimlen = m->m_pkthdr.len - *offp;
 1785 
 1786         /*
 1787          * Validate lengths
 1788          */
 1789         if (pimlen < PIM_MINLEN) {
 1790                 ++pim6stat.pim6s_rcv_tooshort;
 1791 #ifdef MRT6DEBUG
 1792                 if (V_mrt6debug & DEBUG_PIM)
 1793                         log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
 1794 #endif
 1795                 m_freem(m);
 1796                 return (IPPROTO_DONE);
 1797         }
 1798 
 1799         /*
 1800          * if the packet is at least as big as a REGISTER, go ahead
 1801          * and grab the PIM REGISTER header size, to avoid another
 1802          * possible m_pullup() later.
 1803          *
 1804          * PIM_MINLEN       == pimhdr + u_int32 == 8
 1805          * PIM6_REG_MINLEN   == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
 1806          */
 1807         minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
 1808 
 1809         /*
 1810          * Make sure that the IP6 and PIM headers in contiguous memory, and
 1811          * possibly the PIM REGISTER header
 1812          */
 1813 #ifndef PULLDOWN_TEST
 1814         IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
 1815         /* adjust pointer */
 1816         ip6 = mtod(m, struct ip6_hdr *);
 1817 
 1818         /* adjust mbuf to point to the PIM header */
 1819         pim = (struct pim *)((caddr_t)ip6 + off);
 1820 #else
 1821         IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
 1822         if (pim == NULL) {
 1823                 pim6stat.pim6s_rcv_tooshort++;
 1824                 return (IPPROTO_DONE);
 1825         }
 1826 #endif
 1827 
 1828 #define PIM6_CHECKSUM
 1829 #ifdef PIM6_CHECKSUM
 1830         {
 1831                 int cksumlen;
 1832 
 1833                 /*
 1834                  * Validate checksum.
 1835                  * If PIM REGISTER, exclude the data packet
 1836                  */
 1837                 if (pim->pim_type == PIM_REGISTER)
 1838                         cksumlen = PIM_MINLEN;
 1839                 else
 1840                         cksumlen = pimlen;
 1841 
 1842                 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
 1843                         ++pim6stat.pim6s_rcv_badsum;
 1844 #ifdef MRT6DEBUG
 1845                         if (V_mrt6debug & DEBUG_PIM)
 1846                                 log(LOG_DEBUG,
 1847                                     "pim6_input: invalid checksum\n");
 1848 #endif
 1849                         m_freem(m);
 1850                         return (IPPROTO_DONE);
 1851                 }
 1852         }
 1853 #endif /* PIM_CHECKSUM */
 1854 
 1855         /* PIM version check */
 1856         if (pim->pim_ver != PIM_VERSION) {
 1857                 ++pim6stat.pim6s_rcv_badversion;
 1858 #ifdef MRT6DEBUG
 1859                 log(LOG_ERR,
 1860                     "pim6_input: incorrect version %d, expecting %d\n",
 1861                     pim->pim_ver, PIM_VERSION);
 1862 #endif
 1863                 m_freem(m);
 1864                 return (IPPROTO_DONE);
 1865         }
 1866 
 1867         if (pim->pim_type == PIM_REGISTER) {
 1868                 /*
 1869                  * since this is a REGISTER, we'll make a copy of the register
 1870                  * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
 1871                  * routing daemon.
 1872                  */
 1873                 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
 1874 
 1875                 struct mbuf *mcp;
 1876                 struct ip6_hdr *eip6;
 1877                 u_int32_t *reghdr;
 1878                 int rc;
 1879 #ifdef MRT6DEBUG
 1880                 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1881 #endif
 1882 
 1883                 ++pim6stat.pim6s_rcv_registers;
 1884 
 1885                 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
 1886 #ifdef MRT6DEBUG
 1887                         if (V_mrt6debug & DEBUG_PIM)
 1888                                 log(LOG_DEBUG,
 1889                                     "pim6_input: register mif not set: %d\n",
 1890                                     reg_mif_num);
 1891 #endif
 1892                         m_freem(m);
 1893                         return (IPPROTO_DONE);
 1894                 }
 1895 
 1896                 reghdr = (u_int32_t *)(pim + 1);
 1897 
 1898                 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
 1899                         goto pim6_input_to_daemon;
 1900 
 1901                 /*
 1902                  * Validate length
 1903                  */
 1904                 if (pimlen < PIM6_REG_MINLEN) {
 1905                         ++pim6stat.pim6s_rcv_tooshort;
 1906                         ++pim6stat.pim6s_rcv_badregisters;
 1907 #ifdef MRT6DEBUG
 1908                         log(LOG_ERR,
 1909                             "pim6_input: register packet size too "
 1910                             "small %d from %s\n",
 1911                             pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
 1912 #endif
 1913                         m_freem(m);
 1914                         return (IPPROTO_DONE);
 1915                 }
 1916 
 1917                 eip6 = (struct ip6_hdr *) (reghdr + 1);
 1918 #ifdef MRT6DEBUG
 1919                 if (V_mrt6debug & DEBUG_PIM)
 1920                         log(LOG_DEBUG,
 1921                             "pim6_input[register], eip6: %s -> %s, "
 1922                             "eip6 plen %d\n",
 1923                             ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1924                             ip6_sprintf(ip6bufd, &eip6->ip6_dst),
 1925                             ntohs(eip6->ip6_plen));
 1926 #endif
 1927 
 1928                 /* verify the version number of the inner packet */
 1929                 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
 1930                         ++pim6stat.pim6s_rcv_badregisters;
 1931 #ifdef MRT6DEBUG
 1932                         log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
 1933                             "of the inner packet\n",
 1934                             (eip6->ip6_vfc & IPV6_VERSION));
 1935 #endif
 1936                         m_freem(m);
 1937                         return (IPPROTO_NONE);
 1938                 }
 1939 
 1940                 /* verify the inner packet is destined to a mcast group */
 1941                 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
 1942                         ++pim6stat.pim6s_rcv_badregisters;
 1943 #ifdef MRT6DEBUG
 1944                         if (V_mrt6debug & DEBUG_PIM)
 1945                                 log(LOG_DEBUG,
 1946                                     "pim6_input: inner packet of register "
 1947                                     "is not multicast %s\n",
 1948                                     ip6_sprintf(ip6bufd, &eip6->ip6_dst));
 1949 #endif
 1950                         m_freem(m);
 1951                         return (IPPROTO_DONE);
 1952                 }
 1953 
 1954                 /*
 1955                  * make a copy of the whole header to pass to the daemon later.
 1956                  */
 1957                 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
 1958                 if (mcp == NULL) {
 1959 #ifdef MRT6DEBUG
 1960                         log(LOG_ERR,
 1961                             "pim6_input: pim register: "
 1962                             "could not copy register head\n");
 1963 #endif
 1964                         m_freem(m);
 1965                         return (IPPROTO_DONE);
 1966                 }
 1967 
 1968                 /*
 1969                  * forward the inner ip6 packet; point m_data at the inner ip6.
 1970                  */
 1971                 m_adj(m, off + PIM_MINLEN);
 1972 #ifdef MRT6DEBUG
 1973                 if (V_mrt6debug & DEBUG_PIM) {
 1974                         log(LOG_DEBUG,
 1975                             "pim6_input: forwarding decapsulated register: "
 1976                             "src %s, dst %s, mif %d\n",
 1977                             ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1978                             ip6_sprintf(ip6bufd, &eip6->ip6_dst),
 1979                             reg_mif_num);
 1980                 }
 1981 #endif
 1982 
 1983                 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
 1984                                 dst.sin6_family, 0);
 1985 
 1986                 /* prepare the register head to send to the mrouting daemon */
 1987                 m = mcp;
 1988         }
 1989 
 1990         /*
 1991          * Pass the PIM message up to the daemon; if it is a register message
 1992          * pass the 'head' only up to the daemon. This includes the
 1993          * encapsulator ip6 header, pim header, register header and the
 1994          * encapsulated ip6 header.
 1995          */
 1996   pim6_input_to_daemon:
 1997         rip6_input(&m, offp, proto);
 1998         return (IPPROTO_DONE);
 1999 }
 2000 
 2001 static int
 2002 ip6_mroute_modevent(module_t mod, int type, void *unused)
 2003 {
 2004 
 2005         switch (type) {
 2006         case MOD_LOAD:
 2007                 MROUTER6_LOCK_INIT();
 2008                 MFC6_LOCK_INIT();
 2009                 MIF6_LOCK_INIT();
 2010 
 2011                 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
 2012                         pim6_encapcheck,
 2013                         (const struct protosw *)&in6_pim_protosw, NULL);
 2014                 if (pim6_encap_cookie == NULL) {
 2015                         printf("ip6_mroute: unable to attach pim6 encap\n");
 2016                         MIF6_LOCK_DESTROY();
 2017                         MFC6_LOCK_DESTROY();
 2018                         MROUTER6_LOCK_DESTROY();
 2019                         return (EINVAL);
 2020                 }
 2021 
 2022                 ip6_mforward = X_ip6_mforward;
 2023                 ip6_mrouter_done = X_ip6_mrouter_done;
 2024                 ip6_mrouter_get = X_ip6_mrouter_get;
 2025                 ip6_mrouter_set = X_ip6_mrouter_set;
 2026                 mrt6_ioctl = X_mrt6_ioctl;
 2027                 break;
 2028 
 2029         case MOD_UNLOAD:
 2030                 if (V_ip6_mrouter != NULL)
 2031                         return EINVAL;
 2032 
 2033                 if (pim6_encap_cookie) {
 2034                         encap_detach(pim6_encap_cookie);
 2035                         pim6_encap_cookie = NULL;
 2036                 }
 2037                 X_ip6_mrouter_done();
 2038                 ip6_mforward = NULL;
 2039                 ip6_mrouter_done = NULL;
 2040                 ip6_mrouter_get = NULL;
 2041                 ip6_mrouter_set = NULL;
 2042                 mrt6_ioctl = NULL;
 2043 
 2044                 MIF6_LOCK_DESTROY();
 2045                 MFC6_LOCK_DESTROY();
 2046                 MROUTER6_LOCK_DESTROY();
 2047                 break;
 2048 
 2049         default:
 2050                 return (EOPNOTSUPP);
 2051         }
 2052 
 2053         return (0);
 2054 }
 2055 
 2056 static moduledata_t ip6_mroutemod = {
 2057         "ip6_mroute",
 2058         ip6_mroute_modevent,
 2059         0
 2060 };
 2061 
 2062 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);

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