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("$FreeBSD$");
   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 static 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 MRT6STAT_INC(name)      mrt6stat.name += 1
  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 #define DEBUG_ERR       0x80
  222 #define DEBUG_ANY       0x7f
  223 #define MRT6_DLOG(m, fmt, ...)  \
  224         if (V_mrt6debug & (m))  \
  225                 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
  226                     "%s: " fmt "\n", __func__, ##__VA_ARGS__)
  227 #else
  228 #define MRT6_DLOG(m, fmt, ...)
  229 #endif
  230 
  231 static void     expire_upcalls(void *);
  232 #define EXPIRE_TIMEOUT  (hz / 4)        /* 4x / second */
  233 #define UPCALL_EXPIRE   6               /* number of timeouts */
  234 
  235 /*
  236  * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
  237  */
  238 
  239 /*
  240  * 'Interfaces' associated with decapsulator (so we can tell
  241  * packets that went through it from ones that get reflected
  242  * by a broken gateway).  Different from IPv4 register_if,
  243  * these interfaces are linked into the system ifnet list,
  244  * because per-interface IPv6 statistics are maintained in
  245  * ifp->if_afdata.  But it does not have any routes point
  246  * to them.  I.e., packets can't be sent this way.  They
  247  * only exist as a placeholder for multicast source
  248  * verification.
  249  */
  250 static struct ifnet *multicast_register_if6;
  251 
  252 #define ENCAP_HOPS 64
  253 
  254 /*
  255  * Private variables.
  256  */
  257 static mifi_t nummifs = 0;
  258 static mifi_t reg_mif_num = (mifi_t)-1;
  259 
  260 static struct pim6stat pim6stat;
  261 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
  262     &pim6stat, pim6stat,
  263     "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
  264 
  265 #define PIM6STAT_INC(name)      pim6stat.name += 1
  266 static VNET_DEFINE(int, pim6);
  267 #define V_pim6          VNET(pim6)
  268 
  269 /*
  270  * Hash function for a source, group entry
  271  */
  272 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
  273                                    (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
  274                                    (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
  275                                    (g).s6_addr32[2] ^ (g).s6_addr32[3])
  276 
  277 /*
  278  * Find a route for a given origin IPv6 address and Multicast group address.
  279  */
  280 #define MF6CFIND(o, g, rt) do { \
  281         struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
  282         rt = NULL; \
  283         while (_rt) { \
  284                 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
  285                     IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
  286                     (_rt->mf6c_stall == NULL)) { \
  287                         rt = _rt; \
  288                         break; \
  289                 } \
  290                 _rt = _rt->mf6c_next; \
  291         } \
  292         if (rt == NULL) { \
  293                 MRT6STAT_INC(mrt6s_mfc_misses); \
  294         } \
  295 } while (/*CONSTCOND*/ 0)
  296 
  297 /*
  298  * Macros to compute elapsed time efficiently
  299  * Borrowed from Van Jacobson's scheduling code
  300  * XXX: replace with timersub() ?
  301  */
  302 #define TV_DELTA(a, b, delta) do { \
  303             int xxs; \
  304                 \
  305             delta = (a).tv_usec - (b).tv_usec; \
  306             if ((xxs = (a).tv_sec - (b).tv_sec)) { \
  307                switch (xxs) { \
  308                       case 2: \
  309                           delta += 1000000; \
  310                               /* FALLTHROUGH */ \
  311                       case 1: \
  312                           delta += 1000000; \
  313                           break; \
  314                       default: \
  315                           delta += (1000000 * xxs); \
  316                } \
  317             } \
  318 } while (/*CONSTCOND*/ 0)
  319 
  320 /* XXX: replace with timercmp(a, b, <) ? */
  321 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
  322               (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
  323 
  324 #ifdef UPCALL_TIMING
  325 #define UPCALL_MAX      50
  326 static u_long upcall_data[UPCALL_MAX + 1];
  327 static void collate();
  328 #endif /* UPCALL_TIMING */
  329 
  330 static int ip6_mrouter_init(struct socket *, int, int);
  331 static int add_m6fc(struct mf6cctl *);
  332 static int add_m6if(struct mif6ctl *);
  333 static int del_m6fc(struct mf6cctl *);
  334 static int del_m6if(mifi_t *);
  335 static int del_m6if_locked(mifi_t *);
  336 static int get_mif6_cnt(struct sioc_mif_req6 *);
  337 static int get_sg_cnt(struct sioc_sg_req6 *);
  338 
  339 static struct callout expire_upcalls_ch;
  340 
  341 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
  342 int X_ip6_mrouter_done(void);
  343 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
  344 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
  345 int X_mrt6_ioctl(u_long, caddr_t);
  346 
  347 /*
  348  * Handle MRT setsockopt commands to modify the multicast routing tables.
  349  */
  350 int
  351 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
  352 {
  353         int error = 0;
  354         int optval;
  355         struct mif6ctl mifc;
  356         struct mf6cctl mfcc;
  357         mifi_t mifi;
  358 
  359         if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
  360                 return (EACCES);
  361 
  362         switch (sopt->sopt_name) {
  363         case MRT6_INIT:
  364 #ifdef MRT6_OINIT
  365         case MRT6_OINIT:
  366 #endif
  367                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  368                     sizeof(optval));
  369                 if (error)
  370                         break;
  371                 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
  372                 break;
  373         case MRT6_DONE:
  374                 error = X_ip6_mrouter_done();
  375                 break;
  376         case MRT6_ADD_MIF:
  377                 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
  378                 if (error)
  379                         break;
  380                 error = add_m6if(&mifc);
  381                 break;
  382         case MRT6_ADD_MFC:
  383                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  384                 if (error)
  385                         break;
  386                 error = add_m6fc(&mfcc);
  387                 break;
  388         case MRT6_DEL_MFC:
  389                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  390                 if (error)
  391                         break;
  392                 error = del_m6fc(&mfcc);
  393                 break;
  394         case MRT6_DEL_MIF:
  395                 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
  396                 if (error)
  397                         break;
  398                 error = del_m6if(&mifi);
  399                 break;
  400         case MRT6_PIM:
  401                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  402                     sizeof(optval));
  403                 if (error)
  404                         break;
  405                 error = set_pim6(&optval);
  406                 break;
  407         default:
  408                 error = EOPNOTSUPP;
  409                 break;
  410         }
  411 
  412         return (error);
  413 }
  414 
  415 /*
  416  * Handle MRT getsockopt commands
  417  */
  418 int
  419 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
  420 {
  421         int error = 0;
  422 
  423         if (so != V_ip6_mrouter)
  424                 return (EACCES);
  425 
  426         switch (sopt->sopt_name) {
  427                 case MRT6_PIM:
  428                         error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
  429                         break;
  430         }
  431         return (error);
  432 }
  433 
  434 /*
  435  * Handle ioctl commands to obtain information from the cache
  436  */
  437 int
  438 X_mrt6_ioctl(u_long cmd, caddr_t data)
  439 {
  440         int ret;
  441 
  442         ret = EINVAL;
  443 
  444         switch (cmd) {
  445         case SIOCGETSGCNT_IN6:
  446                 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
  447                 break;
  448 
  449         case SIOCGETMIFCNT_IN6:
  450                 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
  451                 break;
  452 
  453         default:
  454                 break;
  455         }
  456 
  457         return (ret);
  458 }
  459 
  460 /*
  461  * returns the packet, byte, rpf-failure count for the source group provided
  462  */
  463 static int
  464 get_sg_cnt(struct sioc_sg_req6 *req)
  465 {
  466         struct mf6c *rt;
  467         int ret;
  468 
  469         ret = 0;
  470 
  471         MFC6_LOCK();
  472 
  473         MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
  474         if (rt == NULL) {
  475                 ret = ESRCH;
  476         } else {
  477                 req->pktcnt = rt->mf6c_pkt_cnt;
  478                 req->bytecnt = rt->mf6c_byte_cnt;
  479                 req->wrong_if = rt->mf6c_wrong_if;
  480         }
  481 
  482         MFC6_UNLOCK();
  483 
  484         return (ret);
  485 }
  486 
  487 /*
  488  * returns the input and output packet and byte counts on the mif provided
  489  */
  490 static int
  491 get_mif6_cnt(struct sioc_mif_req6 *req)
  492 {
  493         mifi_t mifi;
  494         int ret;
  495 
  496         ret = 0;
  497         mifi = req->mifi;
  498 
  499         MIF6_LOCK();
  500 
  501         if (mifi >= nummifs) {
  502                 ret = EINVAL;
  503         } else {
  504                 req->icount = mif6table[mifi].m6_pkt_in;
  505                 req->ocount = mif6table[mifi].m6_pkt_out;
  506                 req->ibytes = mif6table[mifi].m6_bytes_in;
  507                 req->obytes = mif6table[mifi].m6_bytes_out;
  508         }
  509 
  510         MIF6_UNLOCK();
  511 
  512         return (ret);
  513 }
  514 
  515 static int
  516 set_pim6(int *i)
  517 {
  518         if ((*i != 1) && (*i != 0))
  519                 return (EINVAL);
  520 
  521         V_pim6 = *i;
  522 
  523         return (0);
  524 }
  525 
  526 /*
  527  * Enable multicast routing
  528  */
  529 static int
  530 ip6_mrouter_init(struct socket *so, int v, int cmd)
  531 {
  532 
  533         MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
  534             so->so_type, so->so_proto->pr_protocol);
  535 
  536         if (so->so_type != SOCK_RAW ||
  537             so->so_proto->pr_protocol != IPPROTO_ICMPV6)
  538                 return (EOPNOTSUPP);
  539 
  540         if (v != 1)
  541                 return (ENOPROTOOPT);
  542 
  543         MROUTER6_LOCK();
  544 
  545         if (V_ip6_mrouter != NULL) {
  546                 MROUTER6_UNLOCK();
  547                 return (EADDRINUSE);
  548         }
  549 
  550         V_ip6_mrouter = so;
  551         V_ip6_mrouter_ver = cmd;
  552 
  553         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  554         bzero((caddr_t)n6expire, sizeof(n6expire));
  555 
  556         V_pim6 = 0;/* used for stubbing out/in pim stuff */
  557 
  558         callout_init(&expire_upcalls_ch, 0);
  559         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
  560             expire_upcalls, NULL);
  561 
  562         MROUTER6_UNLOCK();
  563         MRT6_DLOG(DEBUG_ANY, "finished");
  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         u_long 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         MRT6_DLOG(DEBUG_ANY, "finished");
  642 
  643         return (0);
  644 }
  645 
  646 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
  647 
  648 /*
  649  * Add a mif to the mif table
  650  */
  651 static int
  652 add_m6if(struct mif6ctl *mifcp)
  653 {
  654         struct mif6 *mifp;
  655         struct ifnet *ifp;
  656         int error;
  657 
  658         MIF6_LOCK();
  659 
  660         if (mifcp->mif6c_mifi >= MAXMIFS) {
  661                 MIF6_UNLOCK();
  662                 return (EINVAL);
  663         }
  664         mifp = mif6table + mifcp->mif6c_mifi;
  665         if (mifp->m6_ifp != NULL) {
  666                 MIF6_UNLOCK();
  667                 return (EADDRINUSE); /* XXX: is it appropriate? */
  668         }
  669         if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
  670                 MIF6_UNLOCK();
  671                 return (ENXIO);
  672         }
  673 
  674         ifp = ifnet_byindex(mifcp->mif6c_pifi);
  675 
  676         if (mifcp->mif6c_flags & MIFF_REGISTER) {
  677                 if (reg_mif_num == (mifi_t)-1) {
  678                         ifp = if_alloc(IFT_OTHER);
  679 
  680                         if_initname(ifp, "register_mif", 0);
  681                         ifp->if_flags |= IFF_LOOPBACK;
  682                         if_attach(ifp);
  683                         multicast_register_if6 = ifp;
  684                         reg_mif_num = mifcp->mif6c_mifi;
  685                         /*
  686                          * it is impossible to guess the ifindex of the
  687                          * register interface.  So mif6c_pifi is automatically
  688                          * calculated.
  689                          */
  690                         mifcp->mif6c_pifi = ifp->if_index;
  691                 } else {
  692                         ifp = multicast_register_if6;
  693                 }
  694         } else {
  695                 /* Make sure the interface supports multicast */
  696                 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
  697                         MIF6_UNLOCK();
  698                         return (EOPNOTSUPP);
  699                 }
  700 
  701                 error = if_allmulti(ifp, 1);
  702                 if (error) {
  703                         MIF6_UNLOCK();
  704                         return (error);
  705                 }
  706         }
  707 
  708         mifp->m6_flags     = mifcp->mif6c_flags;
  709         mifp->m6_ifp       = ifp;
  710 
  711         /* initialize per mif pkt counters */
  712         mifp->m6_pkt_in    = 0;
  713         mifp->m6_pkt_out   = 0;
  714         mifp->m6_bytes_in  = 0;
  715         mifp->m6_bytes_out = 0;
  716 
  717         /* Adjust nummifs up if the mifi is higher than nummifs */
  718         if (nummifs <= mifcp->mif6c_mifi)
  719                 nummifs = mifcp->mif6c_mifi + 1;
  720 
  721         MIF6_UNLOCK();
  722         MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
  723             if_name(ifp));
  724 
  725         return (0);
  726 }
  727 
  728 /*
  729  * Delete a mif from the mif table
  730  */
  731 static int
  732 del_m6if_locked(mifi_t *mifip)
  733 {
  734         struct mif6 *mifp = mif6table + *mifip;
  735         mifi_t mifi;
  736         struct ifnet *ifp;
  737 
  738         MIF6_LOCK_ASSERT();
  739 
  740         if (*mifip >= nummifs)
  741                 return (EINVAL);
  742         if (mifp->m6_ifp == NULL)
  743                 return (EINVAL);
  744 
  745         if (!(mifp->m6_flags & MIFF_REGISTER)) {
  746                 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
  747                 ifp = mifp->m6_ifp;
  748                 if_allmulti(ifp, 0);
  749         } else {
  750                 if (reg_mif_num != (mifi_t)-1 &&
  751                     multicast_register_if6 != NULL) {
  752                         if_detach(multicast_register_if6);
  753                         if_free(multicast_register_if6);
  754                         reg_mif_num = (mifi_t)-1;
  755                         multicast_register_if6 = NULL;
  756                 }
  757         }
  758 
  759         bzero((caddr_t)mifp, sizeof(*mifp));
  760 
  761         /* Adjust nummifs down */
  762         for (mifi = nummifs; mifi > 0; mifi--)
  763                 if (mif6table[mifi - 1].m6_ifp)
  764                         break;
  765         nummifs = mifi;
  766         MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
  767 
  768         return (0);
  769 }
  770 
  771 static int
  772 del_m6if(mifi_t *mifip)
  773 {
  774         int cc;
  775 
  776         MIF6_LOCK();
  777         cc = del_m6if_locked(mifip);
  778         MIF6_UNLOCK();
  779 
  780         return (cc);
  781 }
  782 
  783 /*
  784  * Add an mfc entry
  785  */
  786 static int
  787 add_m6fc(struct mf6cctl *mfccp)
  788 {
  789         struct mf6c *rt;
  790         u_long hash;
  791         struct rtdetq *rte;
  792         u_short nstl;
  793         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  794 
  795         MFC6_LOCK();
  796 
  797         MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
  798                  mfccp->mf6cc_mcastgrp.sin6_addr, rt);
  799 
  800         /* If an entry already exists, just update the fields */
  801         if (rt) {
  802                 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
  803                     ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  804                     ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  805                     mfccp->mf6cc_parent);
  806 
  807                 rt->mf6c_parent = mfccp->mf6cc_parent;
  808                 rt->mf6c_ifset = mfccp->mf6cc_ifset;
  809 
  810                 MFC6_UNLOCK();
  811                 return (0);
  812         }
  813 
  814         /*
  815          * Find the entry for which the upcall was made and update
  816          */
  817         hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
  818                         mfccp->mf6cc_mcastgrp.sin6_addr);
  819         for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
  820                 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  821                                        &mfccp->mf6cc_origin.sin6_addr) &&
  822                     IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  823                                        &mfccp->mf6cc_mcastgrp.sin6_addr) &&
  824                     (rt->mf6c_stall != NULL)) {
  825 
  826                         if (nstl++)
  827                                 log(LOG_ERR,
  828                                     "add_m6fc: %s o %s g %s p %x dbx %p\n",
  829                                     "multiple kernel entries",
  830                                     ip6_sprintf(ip6bufo,
  831                                             &mfccp->mf6cc_origin.sin6_addr),
  832                                     ip6_sprintf(ip6bufg,
  833                                             &mfccp->mf6cc_mcastgrp.sin6_addr),
  834                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  835 
  836                         MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
  837                             ip6_sprintf(ip6bufo,
  838                             &mfccp->mf6cc_origin.sin6_addr),
  839                             ip6_sprintf(ip6bufg,
  840                                 &mfccp->mf6cc_mcastgrp.sin6_addr),
  841                             mfccp->mf6cc_parent, rt->mf6c_stall);
  842 
  843                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  844                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  845                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  846                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  847                         /* initialize pkt counters per src-grp */
  848                         rt->mf6c_pkt_cnt    = 0;
  849                         rt->mf6c_byte_cnt   = 0;
  850                         rt->mf6c_wrong_if   = 0;
  851 
  852                         rt->mf6c_expire = 0;    /* Don't clean this guy up */
  853                         n6expire[hash]--;
  854 
  855                         /* free packets Qed at the end of this entry */
  856                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  857                                 struct rtdetq *n = rte->next;
  858                                 ip6_mdq(rte->m, rte->ifp, rt);
  859                                 m_freem(rte->m);
  860 #ifdef UPCALL_TIMING
  861                                 collate(&(rte->t));
  862 #endif /* UPCALL_TIMING */
  863                                 free(rte, M_MRTABLE6);
  864                                 rte = n;
  865                         }
  866                         rt->mf6c_stall = NULL;
  867                 }
  868         }
  869 
  870         /*
  871          * It is possible that an entry is being inserted without an upcall
  872          */
  873         if (nstl == 0) {
  874                 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
  875                     ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  876                     ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  877                     mfccp->mf6cc_parent);
  878 
  879                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
  880 
  881                         if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  882                                                &mfccp->mf6cc_origin.sin6_addr)&&
  883                             IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  884                                                &mfccp->mf6cc_mcastgrp.sin6_addr)) {
  885 
  886                                 rt->mf6c_origin     = mfccp->mf6cc_origin;
  887                                 rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  888                                 rt->mf6c_parent     = mfccp->mf6cc_parent;
  889                                 rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  890                                 /* initialize pkt counters per src-grp */
  891                                 rt->mf6c_pkt_cnt    = 0;
  892                                 rt->mf6c_byte_cnt   = 0;
  893                                 rt->mf6c_wrong_if   = 0;
  894 
  895                                 if (rt->mf6c_expire)
  896                                         n6expire[hash]--;
  897                                 rt->mf6c_expire    = 0;
  898                         }
  899                 }
  900                 if (rt == NULL) {
  901                         /* no upcall, so make a new entry */
  902                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
  903                                                   M_NOWAIT);
  904                         if (rt == NULL) {
  905                                 MFC6_UNLOCK();
  906                                 return (ENOBUFS);
  907                         }
  908 
  909                         /* insert new entry at head of hash chain */
  910                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  911                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  912                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  913                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  914                         /* initialize pkt counters per src-grp */
  915                         rt->mf6c_pkt_cnt    = 0;
  916                         rt->mf6c_byte_cnt   = 0;
  917                         rt->mf6c_wrong_if   = 0;
  918                         rt->mf6c_expire     = 0;
  919                         rt->mf6c_stall = NULL;
  920 
  921                         /* link into table */
  922                         rt->mf6c_next  = mf6ctable[hash];
  923                         mf6ctable[hash] = rt;
  924                 }
  925         }
  926 
  927         MFC6_UNLOCK();
  928         return (0);
  929 }
  930 
  931 #ifdef UPCALL_TIMING
  932 /*
  933  * collect delay statistics on the upcalls
  934  */
  935 static void
  936 collate(struct timeval *t)
  937 {
  938         u_long d;
  939         struct timeval tp;
  940         u_long delta;
  941 
  942         GET_TIME(tp);
  943 
  944         if (TV_LT(*t, tp))
  945         {
  946                 TV_DELTA(tp, *t, delta);
  947 
  948                 d = delta >> 10;
  949                 if (d > UPCALL_MAX)
  950                         d = UPCALL_MAX;
  951 
  952                 ++upcall_data[d];
  953         }
  954 }
  955 #endif /* UPCALL_TIMING */
  956 
  957 /*
  958  * Delete an mfc entry
  959  */
  960 static int
  961 del_m6fc(struct mf6cctl *mfccp)
  962 {
  963 #ifdef MRT6DEBUG
  964         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  965 #endif
  966         struct sockaddr_in6     origin;
  967         struct sockaddr_in6     mcastgrp;
  968         struct mf6c             *rt;
  969         struct mf6c             **nptr;
  970         u_long          hash;
  971 
  972         origin = mfccp->mf6cc_origin;
  973         mcastgrp = mfccp->mf6cc_mcastgrp;
  974         hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
  975 
  976         MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
  977             ip6_sprintf(ip6bufo, &origin.sin6_addr),
  978             ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
  979 
  980         MFC6_LOCK();
  981 
  982         nptr = &mf6ctable[hash];
  983         while ((rt = *nptr) != NULL) {
  984                 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
  985                                        &rt->mf6c_origin.sin6_addr) &&
  986                     IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
  987                                        &rt->mf6c_mcastgrp.sin6_addr) &&
  988                     rt->mf6c_stall == NULL)
  989                         break;
  990 
  991                 nptr = &rt->mf6c_next;
  992         }
  993         if (rt == NULL) {
  994                 MFC6_UNLOCK();
  995                 return (EADDRNOTAVAIL);
  996         }
  997 
  998         *nptr = rt->mf6c_next;
  999         free(rt, M_MRTABLE6);
 1000 
 1001         MFC6_UNLOCK();
 1002 
 1003         return (0);
 1004 }
 1005 
 1006 static int
 1007 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
 1008 {
 1009 
 1010         if (s) {
 1011                 if (sbappendaddr(&s->so_rcv,
 1012                                  (struct sockaddr *)src,
 1013                                  mm, (struct mbuf *)0) != 0) {
 1014                         sorwakeup(s);
 1015                         return (0);
 1016                 }
 1017         }
 1018         m_freem(mm);
 1019         return (-1);
 1020 }
 1021 
 1022 /*
 1023  * IPv6 multicast forwarding function. This function assumes that the packet
 1024  * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
 1025  * pointed to by "ifp", and the packet is to be relayed to other networks
 1026  * that have members of the packet's destination IPv6 multicast group.
 1027  *
 1028  * The packet is returned unscathed to the caller, unless it is
 1029  * erroneous, in which case a non-zero return value tells the caller to
 1030  * discard it.
 1031  *
 1032  * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
 1033  * this function is called in the originating context (i.e., not when
 1034  * forwarding a packet from other node).  ip6_output(), which is currently the
 1035  * only function that calls this function is called in the originating context,
 1036  * explicitly ensures this condition.  It is caller's responsibility to ensure
 1037  * that if this function is called from somewhere else in the originating
 1038  * context in the future.
 1039  */
 1040 int
 1041 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
 1042 {
 1043         struct rtdetq *rte;
 1044         struct mbuf *mb0;
 1045         struct mf6c *rt;
 1046         struct mif6 *mifp;
 1047         struct mbuf *mm;
 1048         u_long hash;
 1049         mifi_t mifi;
 1050         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1051 #ifdef UPCALL_TIMING
 1052         struct timeval tp;
 1053 
 1054         GET_TIME(tp);
 1055 #endif /* UPCALL_TIMING */
 1056 
 1057         MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
 1058             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1059             ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
 1060 
 1061         /*
 1062          * Don't forward a packet with Hop limit of zero or one,
 1063          * or a packet destined to a local-only group.
 1064          */
 1065         if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
 1066             IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
 1067                 return (0);
 1068         ip6->ip6_hlim--;
 1069 
 1070         /*
 1071          * Source address check: do not forward packets with unspecified
 1072          * source. It was discussed in July 2000, on ipngwg mailing list.
 1073          * This is rather more serious than unicast cases, because some
 1074          * MLD packets can be sent with the unspecified source address
 1075          * (although such packets must normally set 1 to the hop limit field).
 1076          */
 1077         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
 1078                 IP6STAT_INC(ip6s_cantforward);
 1079                 if (V_ip6_log_time + V_ip6_log_interval < time_second) {
 1080                         V_ip6_log_time = time_second;
 1081                         log(LOG_DEBUG,
 1082                             "cannot forward "
 1083                             "from %s to %s nxt %d received on %s\n",
 1084                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1085                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1086                             ip6->ip6_nxt,
 1087                             if_name(m->m_pkthdr.rcvif));
 1088                 }
 1089                 return (0);
 1090         }
 1091 
 1092         MFC6_LOCK();
 1093 
 1094         /*
 1095          * Determine forwarding mifs from the forwarding cache table
 1096          */
 1097         MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
 1098         MRT6STAT_INC(mrt6s_mfc_lookups);
 1099 
 1100         /* Entry exists, so forward if necessary */
 1101         if (rt) {
 1102                 MFC6_UNLOCK();
 1103                 return (ip6_mdq(m, ifp, rt));
 1104         }
 1105 
 1106         /*
 1107          * If we don't have a route for packet's origin,
 1108          * Make a copy of the packet & send message to routing daemon.
 1109          */
 1110         MRT6STAT_INC(mrt6s_no_route);
 1111         MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
 1112             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1113             ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1114 
 1115         /*
 1116          * Allocate mbufs early so that we don't do extra work if we
 1117          * are just going to fail anyway.
 1118          */
 1119         rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
 1120         if (rte == NULL) {
 1121                 MFC6_UNLOCK();
 1122                 return (ENOBUFS);
 1123         }
 1124         mb0 = m_copy(m, 0, M_COPYALL);
 1125         /*
 1126          * Pullup packet header if needed before storing it,
 1127          * as other references may modify it in the meantime.
 1128          */
 1129         if (mb0 && (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
 1130                 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
 1131         if (mb0 == NULL) {
 1132                 free(rte, M_MRTABLE6);
 1133                 MFC6_UNLOCK();
 1134                 return (ENOBUFS);
 1135         }
 1136 
 1137         /* is there an upcall waiting for this packet? */
 1138         hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
 1139         for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
 1140                 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
 1141                     &rt->mf6c_origin.sin6_addr) &&
 1142                     IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
 1143                     &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
 1144                         break;
 1145         }
 1146 
 1147         if (rt == NULL) {
 1148                 struct mrt6msg *im;
 1149 #ifdef MRT6_OINIT
 1150                 struct omrt6msg *oim;
 1151 #endif
 1152                 /* no upcall, so make a new entry */
 1153                 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
 1154                 if (rt == NULL) {
 1155                         free(rte, M_MRTABLE6);
 1156                         m_freem(mb0);
 1157                         MFC6_UNLOCK();
 1158                         return (ENOBUFS);
 1159                 }
 1160                 /*
 1161                  * Make a copy of the header to send to the user
 1162                  * level process
 1163                  */
 1164                 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
 1165                 if (mm == NULL) {
 1166                         free(rte, M_MRTABLE6);
 1167                         m_freem(mb0);
 1168                         free(rt, M_MRTABLE6);
 1169                         MFC6_UNLOCK();
 1170                         return (ENOBUFS);
 1171                 }
 1172 
 1173                 /*
 1174                  * Send message to routing daemon
 1175                  */
 1176                 sin6.sin6_addr = ip6->ip6_src;
 1177                 im = NULL;
 1178 #ifdef MRT6_OINIT
 1179                 oim = NULL;
 1180 #endif
 1181                 switch (V_ip6_mrouter_ver) {
 1182 #ifdef MRT6_OINIT
 1183                 case MRT6_OINIT:
 1184                         oim = mtod(mm, struct omrt6msg *);
 1185                         oim->im6_msgtype = MRT6MSG_NOCACHE;
 1186                         oim->im6_mbz = 0;
 1187                         break;
 1188 #endif
 1189                 case MRT6_INIT:
 1190                         im = mtod(mm, struct mrt6msg *);
 1191                         im->im6_msgtype = MRT6MSG_NOCACHE;
 1192                         im->im6_mbz = 0;
 1193                         break;
 1194                 default:
 1195                         free(rte, M_MRTABLE6);
 1196                         m_freem(mb0);
 1197                         free(rt, M_MRTABLE6);
 1198                         MFC6_UNLOCK();
 1199                         return (EINVAL);
 1200                 }
 1201 
 1202                 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
 1203                 for (mifp = mif6table, mifi = 0;
 1204                     mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
 1205                                 ;
 1206 
 1207                 switch (V_ip6_mrouter_ver) {
 1208 #ifdef MRT6_OINIT
 1209                 case MRT6_OINIT:
 1210                         oim->im6_mif = mifi;
 1211                         break;
 1212 #endif
 1213                 case MRT6_INIT:
 1214                         im->im6_mif = mifi;
 1215                         break;
 1216                 }
 1217 
 1218                 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1219                         log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
 1220                             "socket queue full\n");
 1221                         MRT6STAT_INC(mrt6s_upq_sockfull);
 1222                         free(rte, M_MRTABLE6);
 1223                         m_freem(mb0);
 1224                         free(rt, M_MRTABLE6);
 1225                         MFC6_UNLOCK();
 1226                         return (ENOBUFS);
 1227                 }
 1228 
 1229                 MRT6STAT_INC(mrt6s_upcalls);
 1230 
 1231                 /* insert new entry at head of hash chain */
 1232                 bzero(rt, sizeof(*rt));
 1233                 rt->mf6c_origin.sin6_family = AF_INET6;
 1234                 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
 1235                 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
 1236                 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
 1237                 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
 1238                 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
 1239                 rt->mf6c_expire = UPCALL_EXPIRE;
 1240                 n6expire[hash]++;
 1241                 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
 1242 
 1243                 /* link into table */
 1244                 rt->mf6c_next  = mf6ctable[hash];
 1245                 mf6ctable[hash] = rt;
 1246                 /* Add this entry to the end of the queue */
 1247                 rt->mf6c_stall = rte;
 1248         } else {
 1249                 /* determine if q has overflowed */
 1250                 struct rtdetq **p;
 1251                 int npkts = 0;
 1252 
 1253                 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
 1254                         if (++npkts > MAX_UPQ6) {
 1255                                 MRT6STAT_INC(mrt6s_upq_ovflw);
 1256                                 free(rte, M_MRTABLE6);
 1257                                 m_freem(mb0);
 1258                                 MFC6_UNLOCK();
 1259                                 return (0);
 1260                         }
 1261 
 1262                 /* Add this entry to the end of the queue */
 1263                 *p = rte;
 1264         }
 1265 
 1266         rte->next = NULL;
 1267         rte->m = mb0;
 1268         rte->ifp = ifp;
 1269 #ifdef UPCALL_TIMING
 1270         rte->t = tp;
 1271 #endif /* UPCALL_TIMING */
 1272 
 1273         MFC6_UNLOCK();
 1274 
 1275         return (0);
 1276 }
 1277 
 1278 /*
 1279  * Clean up cache entries if upcalls are not serviced
 1280  * Call from the Slow Timeout mechanism, every half second.
 1281  */
 1282 static void
 1283 expire_upcalls(void *unused)
 1284 {
 1285 #ifdef MRT6DEBUG
 1286         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
 1287 #endif
 1288         struct rtdetq *rte;
 1289         struct mf6c *mfc, **nptr;
 1290         u_long i;
 1291 
 1292         MFC6_LOCK();
 1293         for (i = 0; i < MF6CTBLSIZ; i++) {
 1294                 if (n6expire[i] == 0)
 1295                         continue;
 1296                 nptr = &mf6ctable[i];
 1297                 while ((mfc = *nptr) != NULL) {
 1298                         rte = mfc->mf6c_stall;
 1299                         /*
 1300                          * Skip real cache entries
 1301                          * Make sure it wasn't marked to not expire (shouldn't happen)
 1302                          * If it expires now
 1303                          */
 1304                         if (rte != NULL &&
 1305                             mfc->mf6c_expire != 0 &&
 1306                             --mfc->mf6c_expire == 0) {
 1307                                 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
 1308                                     ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
 1309                                     ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
 1310                                 /*
 1311                                  * drop all the packets
 1312                                  * free the mbuf with the pkt, if, timing info
 1313                                  */
 1314                                 do {
 1315                                         struct rtdetq *n = rte->next;
 1316                                         m_freem(rte->m);
 1317                                         free(rte, M_MRTABLE6);
 1318                                         rte = n;
 1319                                 } while (rte != NULL);
 1320                                 MRT6STAT_INC(mrt6s_cache_cleanups);
 1321                                 n6expire[i]--;
 1322 
 1323                                 *nptr = mfc->mf6c_next;
 1324                                 free(mfc, M_MRTABLE6);
 1325                         } else {
 1326                                 nptr = &mfc->mf6c_next;
 1327                         }
 1328                 }
 1329         }
 1330         MFC6_UNLOCK();
 1331         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
 1332             expire_upcalls, NULL);
 1333 }
 1334 
 1335 /*
 1336  * Packet forwarding routine once entry in the cache is made
 1337  */
 1338 static int
 1339 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
 1340 {
 1341         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1342         mifi_t mifi, iif;
 1343         struct mif6 *mifp;
 1344         int plen = m->m_pkthdr.len;
 1345         struct in6_addr src0, dst0; /* copies for local work */
 1346         u_int32_t iszone, idzone, oszone, odzone;
 1347         int error = 0;
 1348 
 1349 /*
 1350  * Macro to send packet on mif.  Since RSVP packets don't get counted on
 1351  * input, they shouldn't get counted on output, so statistics keeping is
 1352  * separate.
 1353  */
 1354 
 1355 #define MC6_SEND(ip6, mifp, m) do {                             \
 1356         if ((mifp)->m6_flags & MIFF_REGISTER)                   \
 1357                 register_send((ip6), (mifp), (m));              \
 1358         else                                                    \
 1359                 phyint_send((ip6), (mifp), (m));                \
 1360 } while (/*CONSTCOND*/ 0)
 1361 
 1362         /*
 1363          * Don't forward if it didn't arrive from the parent mif
 1364          * for its origin.
 1365          */
 1366         mifi = rt->mf6c_parent;
 1367         if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
 1368                 /* came in the wrong interface */
 1369                 MRT6_DLOG(DEBUG_FORWARD,
 1370                     "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
 1371                     mifi, mif6table[mifi].m6_ifp->if_index);
 1372                 MRT6STAT_INC(mrt6s_wrong_if);
 1373                 rt->mf6c_wrong_if++;
 1374                 /*
 1375                  * If we are doing PIM processing, and we are forwarding
 1376                  * packets on this interface, send a message to the
 1377                  * routing daemon.
 1378                  */
 1379                 /* have to make sure this is a valid mif */
 1380                 if (mifi < nummifs && mif6table[mifi].m6_ifp)
 1381                         if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
 1382                                 /*
 1383                                  * Check the M_LOOP flag to avoid an
 1384                                  * unnecessary PIM assert.
 1385                                  * XXX: M_LOOP is an ad-hoc hack...
 1386                                  */
 1387                                 static struct sockaddr_in6 sin6 =
 1388                                 { sizeof(sin6), AF_INET6 };
 1389 
 1390                                 struct mbuf *mm;
 1391                                 struct mrt6msg *im;
 1392 #ifdef MRT6_OINIT
 1393                                 struct omrt6msg *oim;
 1394 #endif
 1395 
 1396                                 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
 1397                                 if (mm &&
 1398                                     (M_HASCL(mm) ||
 1399                                      mm->m_len < sizeof(struct ip6_hdr)))
 1400                                         mm = m_pullup(mm, sizeof(struct ip6_hdr));
 1401                                 if (mm == NULL)
 1402                                         return (ENOBUFS);
 1403 
 1404 #ifdef MRT6_OINIT
 1405                                 oim = NULL;
 1406 #endif
 1407                                 im = NULL;
 1408                                 switch (V_ip6_mrouter_ver) {
 1409 #ifdef MRT6_OINIT
 1410                                 case MRT6_OINIT:
 1411                                         oim = mtod(mm, struct omrt6msg *);
 1412                                         oim->im6_msgtype = MRT6MSG_WRONGMIF;
 1413                                         oim->im6_mbz = 0;
 1414                                         break;
 1415 #endif
 1416                                 case MRT6_INIT:
 1417                                         im = mtod(mm, struct mrt6msg *);
 1418                                         im->im6_msgtype = MRT6MSG_WRONGMIF;
 1419                                         im->im6_mbz = 0;
 1420                                         break;
 1421                                 default:
 1422                                         m_freem(mm);
 1423                                         return (EINVAL);
 1424                                 }
 1425 
 1426                                 for (mifp = mif6table, iif = 0;
 1427                                      iif < nummifs && mifp &&
 1428                                              mifp->m6_ifp != ifp;
 1429                                      mifp++, iif++)
 1430                                         ;
 1431 
 1432                                 switch (V_ip6_mrouter_ver) {
 1433 #ifdef MRT6_OINIT
 1434                                 case MRT6_OINIT:
 1435                                         oim->im6_mif = iif;
 1436                                         sin6.sin6_addr = oim->im6_src;
 1437                                         break;
 1438 #endif
 1439                                 case MRT6_INIT:
 1440                                         im->im6_mif = iif;
 1441                                         sin6.sin6_addr = im->im6_src;
 1442                                         break;
 1443                                 }
 1444 
 1445                                 MRT6STAT_INC(mrt6s_upcalls);
 1446 
 1447                                 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1448                                         MRT6_DLOG(DEBUG_ANY,
 1449                                             "ip6_mrouter socket queue full");
 1450                                         MRT6STAT_INC(mrt6s_upq_sockfull);
 1451                                         return (ENOBUFS);
 1452                                 }       /* if socket Q full */
 1453                         }               /* if PIM */
 1454                 return (0);
 1455         }                       /* if wrong iif */
 1456 
 1457         /* If I sourced this packet, it counts as output, else it was input. */
 1458         if (m->m_pkthdr.rcvif == NULL) {
 1459                 /* XXX: is rcvif really NULL when output?? */
 1460                 mif6table[mifi].m6_pkt_out++;
 1461                 mif6table[mifi].m6_bytes_out += plen;
 1462         } else {
 1463                 mif6table[mifi].m6_pkt_in++;
 1464                 mif6table[mifi].m6_bytes_in += plen;
 1465         }
 1466         rt->mf6c_pkt_cnt++;
 1467         rt->mf6c_byte_cnt += plen;
 1468 
 1469         /*
 1470          * For each mif, forward a copy of the packet if there are group
 1471          * members downstream on the interface.
 1472          */
 1473         src0 = ip6->ip6_src;
 1474         dst0 = ip6->ip6_dst;
 1475         if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
 1476             (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
 1477                 IP6STAT_INC(ip6s_badscope);
 1478                 return (error);
 1479         }
 1480         for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
 1481                 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
 1482                         /*
 1483                          * check if the outgoing packet is going to break
 1484                          * a scope boundary.
 1485                          * XXX For packets through PIM register tunnel
 1486                          * interface, we believe a routing daemon.
 1487                          */
 1488                         if (!(mif6table[rt->mf6c_parent].m6_flags &
 1489                               MIFF_REGISTER) &&
 1490                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
 1491                                 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
 1492                                     &oszone) ||
 1493                                     in6_setscope(&dst0, mif6table[mifi].m6_ifp,
 1494                                     &odzone) ||
 1495                                     iszone != oszone ||
 1496                                     idzone != odzone) {
 1497                                         IP6STAT_INC(ip6s_badscope);
 1498                                         continue;
 1499                                 }
 1500                         }
 1501 
 1502                         mifp->m6_pkt_out++;
 1503                         mifp->m6_bytes_out += plen;
 1504                         MC6_SEND(ip6, mifp, m);
 1505                 }
 1506         }
 1507         return (0);
 1508 }
 1509 
 1510 static void
 1511 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
 1512 {
 1513 #ifdef MRT6DEBUG
 1514         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1515 #endif
 1516         struct mbuf *mb_copy;
 1517         struct ifnet *ifp = mifp->m6_ifp;
 1518         int error = 0;
 1519         u_long linkmtu;
 1520 
 1521         /*
 1522          * Make a new reference to the packet; make sure that
 1523          * the IPv6 header is actually copied, not just referenced,
 1524          * so that ip6_output() only scribbles on the copy.
 1525          */
 1526         mb_copy = m_copy(m, 0, M_COPYALL);
 1527         if (mb_copy &&
 1528             (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
 1529                 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
 1530         if (mb_copy == NULL) {
 1531                 return;
 1532         }
 1533         /* set MCAST flag to the outgoing packet */
 1534         mb_copy->m_flags |= M_MCAST;
 1535 
 1536         /*
 1537          * If we sourced the packet, call ip6_output since we may devide
 1538          * the packet into fragments when the packet is too big for the
 1539          * outgoing interface.
 1540          * Otherwise, we can simply send the packet to the interface
 1541          * sending queue.
 1542          */
 1543         if (m->m_pkthdr.rcvif == NULL) {
 1544                 struct ip6_moptions im6o;
 1545 
 1546                 im6o.im6o_multicast_ifp = ifp;
 1547                 /* XXX: ip6_output will override ip6->ip6_hlim */
 1548                 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
 1549                 im6o.im6o_multicast_loop = 1;
 1550                 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
 1551                     NULL, NULL);
 1552 
 1553                 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
 1554                     (uint16_t)(mifp - mif6table), error);
 1555                 return;
 1556         }
 1557 
 1558         /*
 1559          * If configured to loop back multicasts by default,
 1560          * loop back a copy now.
 1561          */
 1562         if (in6_mcast_loop) {
 1563                 struct sockaddr_in6 dst6;
 1564 
 1565                 bzero(&dst6, sizeof(dst6));
 1566                 dst6.sin6_len = sizeof(struct sockaddr_in6);
 1567                 dst6.sin6_family = AF_INET6;
 1568                 dst6.sin6_addr = ip6->ip6_dst;
 1569                 ip6_mloopback(ifp, m, &dst6);
 1570         }
 1571 
 1572         /*
 1573          * Put the packet into the sending queue of the outgoing interface
 1574          * if it would fit in the MTU of the interface.
 1575          */
 1576         linkmtu = IN6_LINKMTU(ifp);
 1577         if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
 1578                 struct sockaddr_in6 dst6;
 1579 
 1580                 bzero(&dst6, sizeof(dst6));
 1581                 dst6.sin6_len = sizeof(struct sockaddr_in6);
 1582                 dst6.sin6_family = AF_INET6;
 1583                 dst6.sin6_addr = ip6->ip6_dst;
 1584                 /*
 1585                  * We just call if_output instead of nd6_output here, since
 1586                  * we need no ND for a multicast forwarded packet...right?
 1587                  */
 1588                 error = (*ifp->if_output)(ifp, mb_copy,
 1589                     (struct sockaddr *)&dst6, NULL);
 1590                 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
 1591                     (uint16_t)(mifp - mif6table), error);
 1592         } else {
 1593                 /*
 1594                  * pMTU discovery is intentionally disabled by default, since
 1595                  * various router may notify pMTU in multicast, which can be
 1596                  * a DDoS to a router
 1597                  */
 1598                 if (V_ip6_mcast_pmtu)
 1599                         icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
 1600                 else {
 1601                         MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
 1602                             "g %s size %d (discarded)", if_name(ifp),
 1603                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1604                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1605                             mb_copy->m_pkthdr.len);
 1606                         m_freem(mb_copy); /* simply discard the packet */
 1607                 }
 1608         }
 1609 }
 1610 
 1611 static int
 1612 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
 1613 {
 1614 #ifdef MRT6DEBUG
 1615         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1616 #endif
 1617         struct mbuf *mm;
 1618         int i, len = m->m_pkthdr.len;
 1619         static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
 1620         struct mrt6msg *im6;
 1621 
 1622         MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
 1623             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1624             ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1625         PIM6STAT_INC(pim6s_snd_registers);
 1626 
 1627         /* Make a copy of the packet to send to the user level process */
 1628         MGETHDR(mm, M_DONTWAIT, MT_HEADER);
 1629         if (mm == NULL)
 1630                 return (ENOBUFS);
 1631         mm->m_pkthdr.rcvif = NULL;
 1632         mm->m_data += max_linkhdr;
 1633         mm->m_len = sizeof(struct ip6_hdr);
 1634 
 1635         if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
 1636                 m_freem(mm);
 1637                 return (ENOBUFS);
 1638         }
 1639         i = MHLEN - M_LEADINGSPACE(mm);
 1640         if (i > len)
 1641                 i = len;
 1642         mm = m_pullup(mm, i);
 1643         if (mm == NULL)
 1644                 return (ENOBUFS);
 1645 /* TODO: check it! */
 1646         mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
 1647 
 1648         /*
 1649          * Send message to routing daemon
 1650          */
 1651         sin6.sin6_addr = ip6->ip6_src;
 1652 
 1653         im6 = mtod(mm, struct mrt6msg *);
 1654         im6->im6_msgtype      = MRT6MSG_WHOLEPKT;
 1655         im6->im6_mbz          = 0;
 1656 
 1657         im6->im6_mif = mif - mif6table;
 1658 
 1659         /* iif info is not given for reg. encap.n */
 1660         MRT6STAT_INC(mrt6s_upcalls);
 1661 
 1662         if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1663                 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
 1664                 MRT6STAT_INC(mrt6s_upq_sockfull);
 1665                 return (ENOBUFS);
 1666         }
 1667         return (0);
 1668 }
 1669 
 1670 /*
 1671  * pim6_encapcheck() is called by the encap6_input() path at runtime to
 1672  * determine if a packet is for PIM; allowing PIM to be dynamically loaded
 1673  * into the kernel.
 1674  */
 1675 static int
 1676 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
 1677 {
 1678 
 1679 #ifdef DIAGNOSTIC
 1680     KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
 1681 #endif
 1682     if (proto != IPPROTO_PIM)
 1683         return 0;       /* not for us; reject the datagram. */
 1684 
 1685     return 64;          /* claim the datagram. */
 1686 }
 1687 
 1688 /*
 1689  * PIM sparse mode hook
 1690  * Receives the pim control messages, and passes them up to the listening
 1691  * socket, using rip6_input.
 1692  * The only message processed is the REGISTER pim message; the pim header
 1693  * is stripped off, and the inner packet is passed to register_mforward.
 1694  */
 1695 int
 1696 pim6_input(struct mbuf **mp, int *offp, int proto)
 1697 {
 1698         struct pim *pim; /* pointer to a pim struct */
 1699         struct ip6_hdr *ip6;
 1700         int pimlen;
 1701         struct mbuf *m = *mp;
 1702         int minlen;
 1703         int off = *offp;
 1704 
 1705         PIM6STAT_INC(pim6s_rcv_total);
 1706 
 1707         ip6 = mtod(m, struct ip6_hdr *);
 1708         pimlen = m->m_pkthdr.len - *offp;
 1709 
 1710         /*
 1711          * Validate lengths
 1712          */
 1713         if (pimlen < PIM_MINLEN) {
 1714                 PIM6STAT_INC(pim6s_rcv_tooshort);
 1715                 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
 1716                 m_freem(m);
 1717                 return (IPPROTO_DONE);
 1718         }
 1719 
 1720         /*
 1721          * if the packet is at least as big as a REGISTER, go ahead
 1722          * and grab the PIM REGISTER header size, to avoid another
 1723          * possible m_pullup() later.
 1724          *
 1725          * PIM_MINLEN       == pimhdr + u_int32 == 8
 1726          * PIM6_REG_MINLEN   == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
 1727          */
 1728         minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
 1729 
 1730         /*
 1731          * Make sure that the IP6 and PIM headers in contiguous memory, and
 1732          * possibly the PIM REGISTER header
 1733          */
 1734 #ifndef PULLDOWN_TEST
 1735         IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
 1736         /* adjust pointer */
 1737         ip6 = mtod(m, struct ip6_hdr *);
 1738 
 1739         /* adjust mbuf to point to the PIM header */
 1740         pim = (struct pim *)((caddr_t)ip6 + off);
 1741 #else
 1742         IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
 1743         if (pim == NULL) {
 1744                 PIM6STAT_INC(pim6s_rcv_tooshort);
 1745                 return (IPPROTO_DONE);
 1746         }
 1747 #endif
 1748 
 1749 #define PIM6_CHECKSUM
 1750 #ifdef PIM6_CHECKSUM
 1751         {
 1752                 int cksumlen;
 1753 
 1754                 /*
 1755                  * Validate checksum.
 1756                  * If PIM REGISTER, exclude the data packet
 1757                  */
 1758                 if (pim->pim_type == PIM_REGISTER)
 1759                         cksumlen = PIM_MINLEN;
 1760                 else
 1761                         cksumlen = pimlen;
 1762 
 1763                 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
 1764                         PIM6STAT_INC(pim6s_rcv_badsum);
 1765                         MRT6_DLOG(DEBUG_PIM, "invalid checksum");
 1766                         m_freem(m);
 1767                         return (IPPROTO_DONE);
 1768                 }
 1769         }
 1770 #endif /* PIM_CHECKSUM */
 1771 
 1772         /* PIM version check */
 1773         if (pim->pim_ver != PIM_VERSION) {
 1774                 PIM6STAT_INC(pim6s_rcv_badversion);
 1775                 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
 1776                     "incorrect version %d, expecting %d",
 1777                     pim->pim_ver, PIM_VERSION);
 1778                 m_freem(m);
 1779                 return (IPPROTO_DONE);
 1780         }
 1781 
 1782         if (pim->pim_type == PIM_REGISTER) {
 1783                 /*
 1784                  * since this is a REGISTER, we'll make a copy of the register
 1785                  * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
 1786                  * routing daemon.
 1787                  */
 1788                 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
 1789 
 1790                 struct mbuf *mcp;
 1791                 struct ip6_hdr *eip6;
 1792                 u_int32_t *reghdr;
 1793                 int rc;
 1794 #ifdef MRT6DEBUG
 1795                 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1796 #endif
 1797 
 1798                 PIM6STAT_INC(pim6s_rcv_registers);
 1799 
 1800                 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
 1801                         MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
 1802                             reg_mif_num);
 1803                         m_freem(m);
 1804                         return (IPPROTO_DONE);
 1805                 }
 1806 
 1807                 reghdr = (u_int32_t *)(pim + 1);
 1808 
 1809                 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
 1810                         goto pim6_input_to_daemon;
 1811 
 1812                 /*
 1813                  * Validate length
 1814                  */
 1815                 if (pimlen < PIM6_REG_MINLEN) {
 1816                         PIM6STAT_INC(pim6s_rcv_tooshort);
 1817                         PIM6STAT_INC(pim6s_rcv_badregisters);
 1818                         MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
 1819                             "size too small %d from %s",
 1820                             pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
 1821                         m_freem(m);
 1822                         return (IPPROTO_DONE);
 1823                 }
 1824 
 1825                 eip6 = (struct ip6_hdr *) (reghdr + 1);
 1826                 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
 1827                     ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1828                     ip6_sprintf(ip6bufd, &eip6->ip6_dst),
 1829                     ntohs(eip6->ip6_plen));
 1830 
 1831                 /* verify the version number of the inner packet */
 1832                 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
 1833                         PIM6STAT_INC(pim6s_rcv_badregisters);
 1834                         MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
 1835                             "of the inner packet",
 1836                             (eip6->ip6_vfc & IPV6_VERSION));
 1837                         m_freem(m);
 1838                         return (IPPROTO_NONE);
 1839                 }
 1840 
 1841                 /* verify the inner packet is destined to a mcast group */
 1842                 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
 1843                         PIM6STAT_INC(pim6s_rcv_badregisters);
 1844                         MRT6_DLOG(DEBUG_PIM, "inner packet of register "
 1845                             "is not multicast %s",
 1846                             ip6_sprintf(ip6bufd, &eip6->ip6_dst));
 1847                         m_freem(m);
 1848                         return (IPPROTO_DONE);
 1849                 }
 1850 
 1851                 /*
 1852                  * make a copy of the whole header to pass to the daemon later.
 1853                  */
 1854                 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
 1855                 if (mcp == NULL) {
 1856                         MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
 1857                             "could not copy register head");
 1858                         m_freem(m);
 1859                         return (IPPROTO_DONE);
 1860                 }
 1861 
 1862                 /*
 1863                  * forward the inner ip6 packet; point m_data at the inner ip6.
 1864                  */
 1865                 m_adj(m, off + PIM_MINLEN);
 1866                 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
 1867                     "src %s, dst %s, mif %d",
 1868                     ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1869                     ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
 1870 
 1871                 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
 1872                                 dst.sin6_family, 0);
 1873 
 1874                 /* prepare the register head to send to the mrouting daemon */
 1875                 m = mcp;
 1876         }
 1877 
 1878         /*
 1879          * Pass the PIM message up to the daemon; if it is a register message
 1880          * pass the 'head' only up to the daemon. This includes the
 1881          * encapsulator ip6 header, pim header, register header and the
 1882          * encapsulated ip6 header.
 1883          */
 1884   pim6_input_to_daemon:
 1885         rip6_input(&m, offp, proto);
 1886         return (IPPROTO_DONE);
 1887 }
 1888 
 1889 static int
 1890 ip6_mroute_modevent(module_t mod, int type, void *unused)
 1891 {
 1892 
 1893         switch (type) {
 1894         case MOD_LOAD:
 1895                 MROUTER6_LOCK_INIT();
 1896                 MFC6_LOCK_INIT();
 1897                 MIF6_LOCK_INIT();
 1898 
 1899                 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
 1900                         pim6_encapcheck,
 1901                         (const struct protosw *)&in6_pim_protosw, NULL);
 1902                 if (pim6_encap_cookie == NULL) {
 1903                         printf("ip6_mroute: unable to attach pim6 encap\n");
 1904                         MIF6_LOCK_DESTROY();
 1905                         MFC6_LOCK_DESTROY();
 1906                         MROUTER6_LOCK_DESTROY();
 1907                         return (EINVAL);
 1908                 }
 1909 
 1910                 ip6_mforward = X_ip6_mforward;
 1911                 ip6_mrouter_done = X_ip6_mrouter_done;
 1912                 ip6_mrouter_get = X_ip6_mrouter_get;
 1913                 ip6_mrouter_set = X_ip6_mrouter_set;
 1914                 mrt6_ioctl = X_mrt6_ioctl;
 1915                 break;
 1916 
 1917         case MOD_UNLOAD:
 1918                 if (V_ip6_mrouter != NULL)
 1919                         return EINVAL;
 1920 
 1921                 if (pim6_encap_cookie) {
 1922                         encap_detach(pim6_encap_cookie);
 1923                         pim6_encap_cookie = NULL;
 1924                 }
 1925                 X_ip6_mrouter_done();
 1926                 ip6_mforward = NULL;
 1927                 ip6_mrouter_done = NULL;
 1928                 ip6_mrouter_get = NULL;
 1929                 ip6_mrouter_set = NULL;
 1930                 mrt6_ioctl = NULL;
 1931 
 1932                 MIF6_LOCK_DESTROY();
 1933                 MFC6_LOCK_DESTROY();
 1934                 MROUTER6_LOCK_DESTROY();
 1935                 break;
 1936 
 1937         default:
 1938                 return (EOPNOTSUPP);
 1939         }
 1940 
 1941         return (0);
 1942 }
 1943 
 1944 static moduledata_t ip6_mroutemod = {
 1945         "ip6_mroute",
 1946         ip6_mroute_modevent,
 1947         0
 1948 };
 1949 
 1950 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY);

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