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

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    1 /*-
    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_inet.h"
   85 #include "opt_inet6.h"
   86 
   87 #include <sys/param.h>
   88 #include <sys/callout.h>
   89 #include <sys/errno.h>
   90 #include <sys/kernel.h>
   91 #include <sys/lock.h>
   92 #include <sys/malloc.h>
   93 #include <sys/mbuf.h>
   94 #include <sys/protosw.h>
   95 #include <sys/signalvar.h>
   96 #include <sys/socket.h>
   97 #include <sys/socketvar.h>
   98 #include <sys/sockio.h>
   99 #include <sys/sx.h>
  100 #include <sys/sysctl.h>
  101 #include <sys/syslog.h>
  102 #include <sys/systm.h>
  103 #include <sys/time.h>
  104 
  105 #include <net/if.h>
  106 #include <net/if_types.h>
  107 #include <net/raw_cb.h>
  108 #include <net/route.h>
  109 
  110 #include <netinet/in.h>
  111 #include <netinet/in_var.h>
  112 #include <netinet/icmp6.h>
  113 
  114 #include <netinet/ip6.h>
  115 #include <netinet6/ip6_var.h>
  116 #include <netinet6/scope6_var.h>
  117 #include <netinet6/nd6.h>
  118 #include <netinet6/ip6_mroute.h>
  119 #include <netinet6/ip6protosw.h>
  120 #include <netinet6/pim6.h>
  121 #include <netinet6/pim6_var.h>
  122 
  123 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
  124 
  125 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
  126 #define M_HASCL(m) ((m)->m_flags & M_EXT)
  127 
  128 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
  129 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
  130 
  131 static int set_pim6(int *);
  132 static int socket_send __P((struct socket *, struct mbuf *,
  133             struct sockaddr_in6 *));
  134 static int register_send __P((struct ip6_hdr *, struct mif6 *,
  135             struct mbuf *));
  136 
  137 extern struct domain inet6domain;
  138 
  139 /* XXX: referenced from ip_mroute.c for dynamically loading this code. */
  140 struct ip6protosw in6_pim_protosw = {
  141         .pr_type =              SOCK_RAW,
  142         .pr_domain =            &inet6domain,
  143         .pr_protocol =          IPPROTO_PIM,
  144         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  145         .pr_input =             pim6_input,
  146         .pr_output =            rip6_output,
  147         .pr_ctloutput =         rip6_ctloutput,
  148         .pr_usrreqs =           &rip6_usrreqs
  149 };
  150 
  151 static int ip6_mrouter_ver = 0;
  152 
  153 SYSCTL_DECL(_net_inet6);
  154 SYSCTL_DECL(_net_inet6_ip6);
  155 SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
  156 
  157 static struct mrt6stat mrt6stat;
  158 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
  159     &mrt6stat, mrt6stat,
  160     "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
  161 
  162 #define NO_RTE_FOUND    0x1
  163 #define RTE_FOUND       0x2
  164 
  165 static struct mf6c *mf6ctable[MF6CTBLSIZ];
  166 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
  167     &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
  168     "Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
  169     "netinet6/ip6_mroute.h)");
  170 
  171 static u_char n6expire[MF6CTBLSIZ];
  172 
  173 static struct mif6 mif6table[MAXMIFS];
  174 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
  175     &mif6table, sizeof(mif6table), "S,vif[MAXMIFS]",
  176     "Multicast Interfaces (struct mif[MAXMIFS], netinet6/ip6_mroute.h)");
  177 
  178 #ifdef MRT6DEBUG
  179 static u_int mrt6debug = 0;             /* debug level */
  180 #define DEBUG_MFC       0x02
  181 #define DEBUG_FORWARD   0x04
  182 #define DEBUG_EXPIRE    0x08
  183 #define DEBUG_XMIT      0x10
  184 #define DEBUG_REG       0x20
  185 #define DEBUG_PIM       0x40
  186 #endif
  187 
  188 static void     expire_upcalls(void *);
  189 #define EXPIRE_TIMEOUT  (hz / 4)        /* 4x / second */
  190 #define UPCALL_EXPIRE   6               /* number of timeouts */
  191 
  192 #ifdef INET
  193 #ifdef MROUTING
  194 extern struct socket *ip_mrouter;
  195 #endif
  196 #endif
  197 
  198 /*
  199  * 'Interfaces' associated with decapsulator (so we can tell
  200  * packets that went through it from ones that get reflected
  201  * by a broken gateway).  Different from IPv4 register_if,
  202  * these interfaces are linked into the system ifnet list,
  203  * because per-interface IPv6 statistics are maintained in
  204  * ifp->if_afdata.  But it does not have any routes point
  205  * to them.  I.e., packets can't be sent this way.  They
  206  * only exist as a placeholder for multicast source
  207  * verification.
  208  */
  209 static struct ifnet *multicast_register_if6;
  210 
  211 #define ENCAP_HOPS 64
  212 
  213 /*
  214  * Private variables.
  215  */
  216 static mifi_t nummifs = 0;
  217 static mifi_t reg_mif_num = (mifi_t)-1;
  218 
  219 static struct pim6stat pim6stat;
  220 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD,
  221     &pim6stat, pim6stat,
  222     "PIM Statistics (struct pim6stat, netinet6/pim_var.h)");
  223 
  224 static int pim6;
  225 
  226 /*
  227  * Hash function for a source, group entry
  228  */
  229 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
  230                                    (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
  231                                    (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
  232                                    (g).s6_addr32[2] ^ (g).s6_addr32[3])
  233 
  234 /*
  235  * Find a route for a given origin IPv6 address and Multicast group address.
  236  */
  237 #define MF6CFIND(o, g, rt) do { \
  238         struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
  239         rt = NULL; \
  240         mrt6stat.mrt6s_mfc_lookups++; \
  241         while (_rt) { \
  242                 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
  243                     IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
  244                     (_rt->mf6c_stall == NULL)) { \
  245                         rt = _rt; \
  246                         break; \
  247                 } \
  248                 _rt = _rt->mf6c_next; \
  249         } \
  250         if (rt == NULL) { \
  251                 mrt6stat.mrt6s_mfc_misses++; \
  252         } \
  253 } while (/*CONSTCOND*/ 0)
  254 
  255 /*
  256  * Macros to compute elapsed time efficiently
  257  * Borrowed from Van Jacobson's scheduling code
  258  * XXX: replace with timersub() ?
  259  */
  260 #define TV_DELTA(a, b, delta) do { \
  261             int xxs; \
  262                 \
  263             delta = (a).tv_usec - (b).tv_usec; \
  264             if ((xxs = (a).tv_sec - (b).tv_sec)) { \
  265                switch (xxs) { \
  266                       case 2: \
  267                           delta += 1000000; \
  268                               /* FALLTHROUGH */ \
  269                       case 1: \
  270                           delta += 1000000; \
  271                           break; \
  272                       default: \
  273                           delta += (1000000 * xxs); \
  274                } \
  275             } \
  276 } while (/*CONSTCOND*/ 0)
  277 
  278 /* XXX: replace with timercmp(a, b, <) ? */
  279 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
  280               (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
  281 
  282 #ifdef UPCALL_TIMING
  283 #define UPCALL_MAX      50
  284 static u_long upcall_data[UPCALL_MAX + 1];
  285 static void collate();
  286 #endif /* UPCALL_TIMING */
  287 
  288 static int get_sg_cnt(struct sioc_sg_req6 *);
  289 static int get_mif6_cnt(struct sioc_mif_req6 *);
  290 static int ip6_mrouter_init(struct socket *, int, int);
  291 static int add_m6if(struct mif6ctl *);
  292 static int del_m6if(mifi_t *);
  293 static int add_m6fc(struct mf6cctl *);
  294 static int del_m6fc(struct mf6cctl *);
  295 
  296 static struct callout expire_upcalls_ch;
  297 
  298 int X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m);
  299 int X_ip6_mrouter_done(void);
  300 int X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt);
  301 int X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt);
  302 int X_mrt6_ioctl(int cmd, caddr_t data);
  303 
  304 /*
  305  * Handle MRT setsockopt commands to modify the multicast routing tables.
  306  */
  307 int
  308 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
  309 {
  310         int error = 0;
  311         int optval;
  312         struct mif6ctl mifc;
  313         struct mf6cctl mfcc;
  314         mifi_t mifi;
  315 
  316         if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
  317                 return (EACCES);
  318 
  319         switch (sopt->sopt_name) {
  320         case MRT6_INIT:
  321 #ifdef MRT6_OINIT
  322         case MRT6_OINIT:
  323 #endif
  324                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  325                     sizeof(optval));
  326                 if (error)
  327                         break;
  328                 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
  329                 break;
  330         case MRT6_DONE:
  331                 error = X_ip6_mrouter_done();
  332                 break;
  333         case MRT6_ADD_MIF:
  334                 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
  335                 if (error)
  336                         break;
  337                 error = add_m6if(&mifc);
  338                 break;
  339         case MRT6_ADD_MFC:
  340                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  341                 if (error)
  342                         break;
  343                 error = add_m6fc(&mfcc);
  344                 break;
  345         case MRT6_DEL_MFC:
  346                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  347                 if (error)
  348                         break;
  349                 error = del_m6fc(&mfcc);
  350                 break;
  351         case MRT6_DEL_MIF:
  352                 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
  353                 if (error)
  354                         break;
  355                 error = del_m6if(&mifi);
  356                 break;
  357         case MRT6_PIM:
  358                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  359                     sizeof(optval));
  360                 if (error)
  361                         break;
  362                 error = set_pim6(&optval);
  363                 break;
  364         default:
  365                 error = EOPNOTSUPP;
  366                 break;
  367         }
  368 
  369         return (error);
  370 }
  371 
  372 /*
  373  * Handle MRT getsockopt commands
  374  */
  375 int
  376 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
  377 {
  378         int error = 0;
  379 
  380         if (so != ip6_mrouter)
  381                 return (EACCES);
  382 
  383         switch (sopt->sopt_name) {
  384                 case MRT6_PIM:
  385                         error = sooptcopyout(sopt, &pim6, sizeof(pim6));
  386                         break;
  387         }
  388         return (error);
  389 }
  390 
  391 /*
  392  * Handle ioctl commands to obtain information from the cache
  393  */
  394 int
  395 X_mrt6_ioctl(int cmd, caddr_t data)
  396 {
  397         switch (cmd) {
  398         case SIOCGETSGCNT_IN6:
  399                 return (get_sg_cnt((struct sioc_sg_req6 *)data));
  400         case SIOCGETMIFCNT_IN6:
  401                 return (get_mif6_cnt((struct sioc_mif_req6 *)data));
  402         default:
  403                 return (EINVAL);
  404         }
  405 }
  406 
  407 /*
  408  * returns the packet, byte, rpf-failure count for the source group provided
  409  */
  410 static int
  411 get_sg_cnt(struct sioc_sg_req6 *req)
  412 {
  413         struct mf6c *rt;
  414         int s;
  415 
  416         s = splnet();
  417         MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
  418         splx(s);
  419         if (rt != NULL) {
  420                 req->pktcnt = rt->mf6c_pkt_cnt;
  421                 req->bytecnt = rt->mf6c_byte_cnt;
  422                 req->wrong_if = rt->mf6c_wrong_if;
  423         } else
  424                 return (ESRCH);
  425 #if 0
  426                 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
  427 #endif
  428 
  429         return (0);
  430 }
  431 
  432 /*
  433  * returns the input and output packet and byte counts on the mif provided
  434  */
  435 static int
  436 get_mif6_cnt(struct sioc_mif_req6 *req)
  437 {
  438         mifi_t mifi = req->mifi;
  439 
  440         if (mifi >= nummifs)
  441                 return (EINVAL);
  442 
  443         req->icount = mif6table[mifi].m6_pkt_in;
  444         req->ocount = mif6table[mifi].m6_pkt_out;
  445         req->ibytes = mif6table[mifi].m6_bytes_in;
  446         req->obytes = mif6table[mifi].m6_bytes_out;
  447 
  448         return (0);
  449 }
  450 
  451 static int
  452 set_pim6(int *i)
  453 {
  454         if ((*i != 1) && (*i != 0))
  455                 return (EINVAL);
  456 
  457         pim6 = *i;
  458 
  459         return (0);
  460 }
  461 
  462 /*
  463  * Enable multicast routing
  464  */
  465 static int
  466 ip6_mrouter_init(struct socket *so, int v, int cmd)
  467 {
  468 #ifdef MRT6DEBUG
  469         if (mrt6debug)
  470                 log(LOG_DEBUG,
  471                     "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
  472                     so->so_type, so->so_proto->pr_protocol);
  473 #endif
  474 
  475         if (so->so_type != SOCK_RAW ||
  476             so->so_proto->pr_protocol != IPPROTO_ICMPV6)
  477                 return (EOPNOTSUPP);
  478 
  479         if (v != 1)
  480                 return (ENOPROTOOPT);
  481 
  482         if (ip6_mrouter != NULL)
  483                 return (EADDRINUSE);
  484 
  485         ip6_mrouter = so;
  486         ip6_mrouter_ver = cmd;
  487 
  488         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  489         bzero((caddr_t)n6expire, sizeof(n6expire));
  490 
  491         pim6 = 0;/* used for stubbing out/in pim stuff */
  492 
  493         callout_init(&expire_upcalls_ch, 0);
  494         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
  495             expire_upcalls, NULL);
  496 
  497 #ifdef MRT6DEBUG
  498         if (mrt6debug)
  499                 log(LOG_DEBUG, "ip6_mrouter_init\n");
  500 #endif
  501 
  502         return (0);
  503 }
  504 
  505 /*
  506  * Disable multicast routing
  507  */
  508 int
  509 X_ip6_mrouter_done(void)
  510 {
  511         mifi_t mifi;
  512         int i;
  513         struct mf6c *rt;
  514         struct rtdetq *rte;
  515         int s;
  516 
  517         s = splnet();
  518 
  519         /*
  520          * For each phyint in use, disable promiscuous reception of all IPv6
  521          * multicasts.
  522          */
  523 #ifdef INET
  524 #ifdef MROUTING
  525         /*
  526          * If there is still IPv4 multicast routing daemon,
  527          * we remain interfaces to receive all muliticasted packets.
  528          * XXX: there may be an interface in which the IPv4 multicast
  529          * daemon is not interested...
  530          */
  531         if (!ip_mrouter)
  532 #endif
  533 #endif
  534         {
  535                 for (mifi = 0; mifi < nummifs; mifi++) {
  536                         if (mif6table[mifi].m6_ifp &&
  537                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
  538                                 if_allmulti(mif6table[mifi].m6_ifp, 0);
  539                         }
  540                 }
  541         }
  542         bzero((caddr_t)mif6table, sizeof(mif6table));
  543         nummifs = 0;
  544 
  545         pim6 = 0; /* used to stub out/in pim specific code */
  546 
  547         callout_stop(&expire_upcalls_ch);
  548 
  549         /*
  550          * Free all multicast forwarding cache entries.
  551          */
  552         for (i = 0; i < MF6CTBLSIZ; i++) {
  553                 rt = mf6ctable[i];
  554                 while (rt) {
  555                         struct mf6c *frt;
  556 
  557                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  558                                 struct rtdetq *n = rte->next;
  559 
  560                                 m_free(rte->m);
  561                                 free(rte, M_MRTABLE6);
  562                                 rte = n;
  563                         }
  564                         frt = rt;
  565                         rt = rt->mf6c_next;
  566                         free(frt, M_MRTABLE6);
  567                 }
  568         }
  569 
  570         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  571 
  572         /*
  573          * Reset register interface
  574          */
  575         if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
  576                 if_detach(multicast_register_if6);
  577                 if_free(multicast_register_if6);
  578                 reg_mif_num = (mifi_t)-1;
  579                 multicast_register_if6 = NULL;
  580         }
  581 
  582         ip6_mrouter = NULL;
  583         ip6_mrouter_ver = 0;
  584 
  585         splx(s);
  586 
  587 #ifdef MRT6DEBUG
  588         if (mrt6debug)
  589                 log(LOG_DEBUG, "ip6_mrouter_done\n");
  590 #endif
  591 
  592         return (0);
  593 }
  594 
  595 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
  596 
  597 /*
  598  * Add a mif to the mif table
  599  */
  600 static int
  601 add_m6if(struct mif6ctl *mifcp)
  602 {
  603         struct mif6 *mifp;
  604         struct ifnet *ifp;
  605         int error, s;
  606 
  607         if (mifcp->mif6c_mifi >= MAXMIFS)
  608                 return (EINVAL);
  609         mifp = mif6table + mifcp->mif6c_mifi;
  610         if (mifp->m6_ifp)
  611                 return (EADDRINUSE); /* XXX: is it appropriate? */
  612         if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
  613                 return (ENXIO);
  614         ifp = ifnet_byindex(mifcp->mif6c_pifi);
  615 
  616         if (mifcp->mif6c_flags & MIFF_REGISTER) {
  617                 if (reg_mif_num == (mifi_t)-1) {
  618                         ifp = if_alloc(IFT_OTHER);
  619 
  620                         if_initname(ifp, "register_mif", 0);
  621                         ifp->if_flags |= IFF_LOOPBACK;
  622                         if_attach(ifp);
  623                         multicast_register_if6 = ifp;
  624                         reg_mif_num = mifcp->mif6c_mifi;
  625                         /*
  626                          * it is impossible to guess the ifindex of the
  627                          * register interface.  So mif6c_pifi is automatically
  628                          * calculated.
  629                          */
  630                         mifcp->mif6c_pifi = ifp->if_index;
  631                 } else {
  632                         ifp = multicast_register_if6;
  633                 }
  634 
  635         } /* if REGISTER */
  636         else {
  637                 /* Make sure the interface supports multicast */
  638                 if ((ifp->if_flags & IFF_MULTICAST) == 0)
  639                         return (EOPNOTSUPP);
  640 
  641                 s = splnet();
  642                 error = if_allmulti(ifp, 1);
  643                 splx(s);
  644                 if (error)
  645                         return (error);
  646         }
  647 
  648         s = splnet();
  649         mifp->m6_flags     = mifcp->mif6c_flags;
  650         mifp->m6_ifp       = ifp;
  651 
  652         /* initialize per mif pkt counters */
  653         mifp->m6_pkt_in    = 0;
  654         mifp->m6_pkt_out   = 0;
  655         mifp->m6_bytes_in  = 0;
  656         mifp->m6_bytes_out = 0;
  657         splx(s);
  658 
  659         /* Adjust nummifs up if the mifi is higher than nummifs */
  660         if (nummifs <= mifcp->mif6c_mifi)
  661                 nummifs = mifcp->mif6c_mifi + 1;
  662 
  663 #ifdef MRT6DEBUG
  664         if (mrt6debug)
  665                 log(LOG_DEBUG,
  666                     "add_mif #%d, phyint %s\n",
  667                     mifcp->mif6c_mifi,
  668                     ifp->if_xname);
  669 #endif
  670 
  671         return (0);
  672 }
  673 
  674 /*
  675  * Delete a mif from the mif table
  676  */
  677 static int
  678 del_m6if(mifi_t *mifip)
  679 {
  680         struct mif6 *mifp = mif6table + *mifip;
  681         mifi_t mifi;
  682         struct ifnet *ifp;
  683         int s;
  684 
  685         if (*mifip >= nummifs)
  686                 return (EINVAL);
  687         if (mifp->m6_ifp == NULL)
  688                 return (EINVAL);
  689 
  690         s = splnet();
  691 
  692         if (!(mifp->m6_flags & MIFF_REGISTER)) {
  693                 /*
  694                  * XXX: what if there is yet IPv4 multicast daemon
  695                  *      using the interface?
  696                  */
  697                 ifp = mifp->m6_ifp;
  698 
  699                 if_allmulti(ifp, 0);
  700         } else {
  701                 if (reg_mif_num != (mifi_t)-1 &&
  702                     multicast_register_if6 != NULL) {
  703                         if_detach(multicast_register_if6);
  704                         if_free(multicast_register_if6);
  705                         reg_mif_num = (mifi_t)-1;
  706                         multicast_register_if6 = NULL;
  707                 }
  708         }
  709 
  710         bzero((caddr_t)mifp, sizeof(*mifp));
  711 
  712         /* Adjust nummifs down */
  713         for (mifi = nummifs; mifi > 0; mifi--)
  714                 if (mif6table[mifi - 1].m6_ifp)
  715                         break;
  716         nummifs = mifi;
  717 
  718         splx(s);
  719 
  720 #ifdef MRT6DEBUG
  721         if (mrt6debug)
  722                 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
  723 #endif
  724 
  725         return (0);
  726 }
  727 
  728 /*
  729  * Add an mfc entry
  730  */
  731 static int
  732 add_m6fc(struct mf6cctl *mfccp)
  733 {
  734         struct mf6c *rt;
  735         u_long hash;
  736         struct rtdetq *rte;
  737         u_short nstl;
  738         int s;
  739         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  740 
  741         MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
  742                  mfccp->mf6cc_mcastgrp.sin6_addr, rt);
  743 
  744         /* If an entry already exists, just update the fields */
  745         if (rt) {
  746 #ifdef MRT6DEBUG
  747                 if (mrt6debug & DEBUG_MFC) {
  748                     log(LOG_DEBUG,
  749                         "add_m6fc no upcall h %d o %s g %s p %x\n",
  750                         ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  751                         ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  752                         mfccp->mf6cc_parent);
  753                 }
  754 #endif
  755 
  756                 s = splnet();
  757                 rt->mf6c_parent = mfccp->mf6cc_parent;
  758                 rt->mf6c_ifset = mfccp->mf6cc_ifset;
  759                 splx(s);
  760                 return (0);
  761         }
  762 
  763         /*
  764          * Find the entry for which the upcall was made and update
  765          */
  766         s = splnet();
  767         hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
  768                         mfccp->mf6cc_mcastgrp.sin6_addr);
  769         for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
  770                 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  771                                        &mfccp->mf6cc_origin.sin6_addr) &&
  772                     IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  773                                        &mfccp->mf6cc_mcastgrp.sin6_addr) &&
  774                     (rt->mf6c_stall != NULL)) {
  775 
  776                         if (nstl++)
  777                                 log(LOG_ERR,
  778                                     "add_m6fc: %s o %s g %s p %x dbx %p\n",
  779                                     "multiple kernel entries",
  780                                     ip6_sprintf(ip6bufo,
  781                                             &mfccp->mf6cc_origin.sin6_addr),
  782                                     ip6_sprintf(ip6bufg,
  783                                             &mfccp->mf6cc_mcastgrp.sin6_addr),
  784                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  785 
  786 #ifdef MRT6DEBUG
  787                         if (mrt6debug & DEBUG_MFC)
  788                                 log(LOG_DEBUG,
  789                                     "add_m6fc o %s g %s p %x dbg %x\n",
  790                                     ip6_sprintf(ip6bufo,
  791                                             &mfccp->mf6cc_origin.sin6_addr),
  792                                     ip6_sprintf(ip6bufg,
  793                                             &mfccp->mf6cc_mcastgrp.sin6_addr),
  794                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  795 #endif
  796 
  797                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  798                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  799                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  800                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  801                         /* initialize pkt counters per src-grp */
  802                         rt->mf6c_pkt_cnt    = 0;
  803                         rt->mf6c_byte_cnt   = 0;
  804                         rt->mf6c_wrong_if   = 0;
  805 
  806                         rt->mf6c_expire = 0;    /* Don't clean this guy up */
  807                         n6expire[hash]--;
  808 
  809                         /* free packets Qed at the end of this entry */
  810                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  811                                 struct rtdetq *n = rte->next;
  812                                 ip6_mdq(rte->m, rte->ifp, rt);
  813                                 m_freem(rte->m);
  814 #ifdef UPCALL_TIMING
  815                                 collate(&(rte->t));
  816 #endif /* UPCALL_TIMING */
  817                                 free(rte, M_MRTABLE6);
  818                                 rte = n;
  819                         }
  820                         rt->mf6c_stall = NULL;
  821                 }
  822         }
  823 
  824         /*
  825          * It is possible that an entry is being inserted without an upcall
  826          */
  827         if (nstl == 0) {
  828 #ifdef MRT6DEBUG
  829                 if (mrt6debug & DEBUG_MFC)
  830                     log(LOG_DEBUG,
  831                         "add_mfc no upcall h %d o %s g %s p %x\n",
  832                         hash,
  833                         ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  834                         ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  835                         mfccp->mf6cc_parent);
  836 #endif
  837 
  838                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
  839 
  840                         if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  841                                                &mfccp->mf6cc_origin.sin6_addr)&&
  842                             IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  843                                                &mfccp->mf6cc_mcastgrp.sin6_addr)) {
  844 
  845                                 rt->mf6c_origin     = mfccp->mf6cc_origin;
  846                                 rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  847                                 rt->mf6c_parent     = mfccp->mf6cc_parent;
  848                                 rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  849                                 /* initialize pkt counters per src-grp */
  850                                 rt->mf6c_pkt_cnt    = 0;
  851                                 rt->mf6c_byte_cnt   = 0;
  852                                 rt->mf6c_wrong_if   = 0;
  853 
  854                                 if (rt->mf6c_expire)
  855                                         n6expire[hash]--;
  856                                 rt->mf6c_expire    = 0;
  857                         }
  858                 }
  859                 if (rt == NULL) {
  860                         /* no upcall, so make a new entry */
  861                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
  862                                                   M_NOWAIT);
  863                         if (rt == NULL) {
  864                                 splx(s);
  865                                 return (ENOBUFS);
  866                         }
  867 
  868                         /* insert new entry at head of hash chain */
  869                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  870                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  871                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  872                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  873                         /* initialize pkt counters per src-grp */
  874                         rt->mf6c_pkt_cnt    = 0;
  875                         rt->mf6c_byte_cnt   = 0;
  876                         rt->mf6c_wrong_if   = 0;
  877                         rt->mf6c_expire     = 0;
  878                         rt->mf6c_stall = NULL;
  879 
  880                         /* link into table */
  881                         rt->mf6c_next  = mf6ctable[hash];
  882                         mf6ctable[hash] = rt;
  883                 }
  884         }
  885         splx(s);
  886         return (0);
  887 }
  888 
  889 #ifdef UPCALL_TIMING
  890 /*
  891  * collect delay statistics on the upcalls
  892  */
  893 static void
  894 collate(struct timeval *t)
  895 {
  896         u_long d;
  897         struct timeval tp;
  898         u_long delta;
  899 
  900         GET_TIME(tp);
  901 
  902         if (TV_LT(*t, tp))
  903         {
  904                 TV_DELTA(tp, *t, delta);
  905 
  906                 d = delta >> 10;
  907                 if (d > UPCALL_MAX)
  908                         d = UPCALL_MAX;
  909 
  910                 ++upcall_data[d];
  911         }
  912 }
  913 #endif /* UPCALL_TIMING */
  914 
  915 /*
  916  * Delete an mfc entry
  917  */
  918 static int
  919 del_m6fc(struct mf6cctl *mfccp)
  920 {
  921         struct sockaddr_in6     origin;
  922         struct sockaddr_in6     mcastgrp;
  923         struct mf6c             *rt;
  924         struct mf6c             **nptr;
  925         u_long          hash;
  926         int s;
  927 
  928         origin = mfccp->mf6cc_origin;
  929         mcastgrp = mfccp->mf6cc_mcastgrp;
  930         hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
  931 
  932 #ifdef MRT6DEBUG
  933         if (mrt6debug & DEBUG_MFC) {
  934                 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  935                 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
  936                     ip6_sprintf(ip6bufo, &origin.sin6_addr),
  937                     ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
  938         }
  939 #endif
  940 
  941         s = splnet();
  942 
  943         nptr = &mf6ctable[hash];
  944         while ((rt = *nptr) != NULL) {
  945                 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
  946                                        &rt->mf6c_origin.sin6_addr) &&
  947                     IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
  948                                        &rt->mf6c_mcastgrp.sin6_addr) &&
  949                     rt->mf6c_stall == NULL)
  950                         break;
  951 
  952                 nptr = &rt->mf6c_next;
  953         }
  954         if (rt == NULL) {
  955                 splx(s);
  956                 return (EADDRNOTAVAIL);
  957         }
  958 
  959         *nptr = rt->mf6c_next;
  960         free(rt, M_MRTABLE6);
  961 
  962         splx(s);
  963 
  964         return (0);
  965 }
  966 
  967 static int
  968 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
  969 {
  970 
  971         if (s) {
  972                 if (sbappendaddr(&s->so_rcv,
  973                                  (struct sockaddr *)src,
  974                                  mm, (struct mbuf *)0) != 0) {
  975                         sorwakeup(s);
  976                         return (0);
  977                 }
  978         }
  979         m_freem(mm);
  980         return (-1);
  981 }
  982 
  983 /*
  984  * IPv6 multicast forwarding function. This function assumes that the packet
  985  * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
  986  * pointed to by "ifp", and the packet is to be relayed to other networks
  987  * that have members of the packet's destination IPv6 multicast group.
  988  *
  989  * The packet is returned unscathed to the caller, unless it is
  990  * erroneous, in which case a non-zero return value tells the caller to
  991  * discard it.
  992  *
  993  * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
  994  * this function is called in the originating context (i.e., not when
  995  * forwarding a packet from other node).  ip6_output(), which is currently the
  996  * only function that calls this function is called in the originating context,
  997  * explicitly ensures this condition.  It is caller's responsibility to ensure
  998  * that if this function is called from somewhere else in the originating
  999  * context in the future.
 1000  */
 1001 int
 1002 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
 1003 {
 1004         struct mf6c *rt;
 1005         struct mif6 *mifp;
 1006         struct mbuf *mm;
 1007         int s;
 1008         mifi_t mifi;
 1009         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1010 
 1011 #ifdef MRT6DEBUG
 1012         if (mrt6debug & DEBUG_FORWARD)
 1013                 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
 1014                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1015                     ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1016                     ifp->if_index);
 1017 #endif
 1018 
 1019         /*
 1020          * Don't forward a packet with Hop limit of zero or one,
 1021          * or a packet destined to a local-only group.
 1022          */
 1023         if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
 1024             IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
 1025                 return (0);
 1026         ip6->ip6_hlim--;
 1027 
 1028         /*
 1029          * Source address check: do not forward packets with unspecified
 1030          * source. It was discussed in July 2000, on ipngwg mailing list.
 1031          * This is rather more serious than unicast cases, because some
 1032          * MLD packets can be sent with the unspecified source address
 1033          * (although such packets must normally set 1 to the hop limit field).
 1034          */
 1035         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
 1036                 ip6stat.ip6s_cantforward++;
 1037                 if (ip6_log_time + ip6_log_interval < time_second) {
 1038                         ip6_log_time = time_second;
 1039                         log(LOG_DEBUG,
 1040                             "cannot forward "
 1041                             "from %s to %s nxt %d received on %s\n",
 1042                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1043                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1044                             ip6->ip6_nxt,
 1045                             if_name(m->m_pkthdr.rcvif));
 1046                 }
 1047                 return (0);
 1048         }
 1049 
 1050         /*
 1051          * Determine forwarding mifs from the forwarding cache table
 1052          */
 1053         s = splnet();
 1054         MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
 1055 
 1056         /* Entry exists, so forward if necessary */
 1057         if (rt) {
 1058                 splx(s);
 1059                 return (ip6_mdq(m, ifp, rt));
 1060         } else {
 1061                 /*
 1062                  * If we don't have a route for packet's origin,
 1063                  * Make a copy of the packet &
 1064                  * send message to routing daemon
 1065                  */
 1066 
 1067                 struct mbuf *mb0;
 1068                 struct rtdetq *rte;
 1069                 u_long hash;
 1070 /*              int i, npkts;*/
 1071 #ifdef UPCALL_TIMING
 1072                 struct timeval tp;
 1073 
 1074                 GET_TIME(tp);
 1075 #endif /* UPCALL_TIMING */
 1076 
 1077                 mrt6stat.mrt6s_no_route++;
 1078 #ifdef MRT6DEBUG
 1079                 if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
 1080                         log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
 1081                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1082                             ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1083 #endif
 1084 
 1085                 /*
 1086                  * Allocate mbufs early so that we don't do extra work if we
 1087                  * are just going to fail anyway.
 1088                  */
 1089                 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6,
 1090                                               M_NOWAIT);
 1091                 if (rte == NULL) {
 1092                         splx(s);
 1093                         return (ENOBUFS);
 1094                 }
 1095                 mb0 = m_copy(m, 0, M_COPYALL);
 1096                 /*
 1097                  * Pullup packet header if needed before storing it,
 1098                  * as other references may modify it in the meantime.
 1099                  */
 1100                 if (mb0 &&
 1101                     (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
 1102                         mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
 1103                 if (mb0 == NULL) {
 1104                         free(rte, M_MRTABLE6);
 1105                         splx(s);
 1106                         return (ENOBUFS);
 1107                 }
 1108 
 1109                 /* is there an upcall waiting for this packet? */
 1110                 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
 1111                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
 1112                         if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
 1113                                                &rt->mf6c_origin.sin6_addr) &&
 1114                             IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
 1115                                                &rt->mf6c_mcastgrp.sin6_addr) &&
 1116                             (rt->mf6c_stall != NULL))
 1117                                 break;
 1118                 }
 1119 
 1120                 if (rt == NULL) {
 1121                         struct mrt6msg *im;
 1122 #ifdef MRT6_OINIT
 1123                         struct omrt6msg *oim;
 1124 #endif
 1125 
 1126                         /* no upcall, so make a new entry */
 1127                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
 1128                                                   M_NOWAIT);
 1129                         if (rt == NULL) {
 1130                                 free(rte, M_MRTABLE6);
 1131                                 m_freem(mb0);
 1132                                 splx(s);
 1133                                 return (ENOBUFS);
 1134                         }
 1135                         /*
 1136                          * Make a copy of the header to send to the user
 1137                          * level process
 1138                          */
 1139                         mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
 1140 
 1141                         if (mm == NULL) {
 1142                                 free(rte, M_MRTABLE6);
 1143                                 m_freem(mb0);
 1144                                 free(rt, M_MRTABLE6);
 1145                                 splx(s);
 1146                                 return (ENOBUFS);
 1147                         }
 1148 
 1149                         /*
 1150                          * Send message to routing daemon
 1151                          */
 1152                         sin6.sin6_addr = ip6->ip6_src;
 1153 
 1154                         im = NULL;
 1155 #ifdef MRT6_OINIT
 1156                         oim = NULL;
 1157 #endif
 1158                         switch (ip6_mrouter_ver) {
 1159 #ifdef MRT6_OINIT
 1160                         case MRT6_OINIT:
 1161                                 oim = mtod(mm, struct omrt6msg *);
 1162                                 oim->im6_msgtype = MRT6MSG_NOCACHE;
 1163                                 oim->im6_mbz = 0;
 1164                                 break;
 1165 #endif
 1166                         case MRT6_INIT:
 1167                                 im = mtod(mm, struct mrt6msg *);
 1168                                 im->im6_msgtype = MRT6MSG_NOCACHE;
 1169                                 im->im6_mbz = 0;
 1170                                 break;
 1171                         default:
 1172                                 free(rte, M_MRTABLE6);
 1173                                 m_freem(mb0);
 1174                                 free(rt, M_MRTABLE6);
 1175                                 splx(s);
 1176                                 return (EINVAL);
 1177                         }
 1178 
 1179 #ifdef MRT6DEBUG
 1180                         if (mrt6debug & DEBUG_FORWARD)
 1181                                 log(LOG_DEBUG,
 1182                                     "getting the iif info in the kernel\n");
 1183 #endif
 1184 
 1185                         for (mifp = mif6table, mifi = 0;
 1186                              mifi < nummifs && mifp->m6_ifp != ifp;
 1187                              mifp++, mifi++)
 1188                                 ;
 1189 
 1190                         switch (ip6_mrouter_ver) {
 1191 #ifdef MRT6_OINIT
 1192                         case MRT6_OINIT:
 1193                                 oim->im6_mif = mifi;
 1194                                 break;
 1195 #endif
 1196                         case MRT6_INIT:
 1197                                 im->im6_mif = mifi;
 1198                                 break;
 1199                         }
 1200 
 1201                         if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1202                                 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
 1203                                     "socket queue full\n");
 1204                                 mrt6stat.mrt6s_upq_sockfull++;
 1205                                 free(rte, M_MRTABLE6);
 1206                                 m_freem(mb0);
 1207                                 free(rt, M_MRTABLE6);
 1208                                 splx(s);
 1209                                 return (ENOBUFS);
 1210                         }
 1211 
 1212                         mrt6stat.mrt6s_upcalls++;
 1213 
 1214                         /* insert new entry at head of hash chain */
 1215                         bzero(rt, sizeof(*rt));
 1216                         rt->mf6c_origin.sin6_family = AF_INET6;
 1217                         rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
 1218                         rt->mf6c_origin.sin6_addr = ip6->ip6_src;
 1219                         rt->mf6c_mcastgrp.sin6_family = AF_INET6;
 1220                         rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
 1221                         rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
 1222                         rt->mf6c_expire = UPCALL_EXPIRE;
 1223                         n6expire[hash]++;
 1224                         rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
 1225 
 1226                         /* link into table */
 1227                         rt->mf6c_next  = mf6ctable[hash];
 1228                         mf6ctable[hash] = rt;
 1229                         /* Add this entry to the end of the queue */
 1230                         rt->mf6c_stall = rte;
 1231                 } else {
 1232                         /* determine if q has overflowed */
 1233                         struct rtdetq **p;
 1234                         int npkts = 0;
 1235 
 1236                         for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
 1237                                 if (++npkts > MAX_UPQ6) {
 1238                                         mrt6stat.mrt6s_upq_ovflw++;
 1239                                         free(rte, M_MRTABLE6);
 1240                                         m_freem(mb0);
 1241                                         splx(s);
 1242                                         return (0);
 1243                                 }
 1244 
 1245                         /* Add this entry to the end of the queue */
 1246                         *p = rte;
 1247                 }
 1248 
 1249                 rte->next = NULL;
 1250                 rte->m = mb0;
 1251                 rte->ifp = ifp;
 1252 #ifdef UPCALL_TIMING
 1253                 rte->t = tp;
 1254 #endif /* UPCALL_TIMING */
 1255 
 1256                 splx(s);
 1257 
 1258                 return (0);
 1259         }
 1260 }
 1261 
 1262 /*
 1263  * Clean up cache entries if upcalls are not serviced
 1264  * Call from the Slow Timeout mechanism, every half second.
 1265  */
 1266 static void
 1267 expire_upcalls(void *unused)
 1268 {
 1269         struct rtdetq *rte;
 1270         struct mf6c *mfc, **nptr;
 1271         int i;
 1272         int s;
 1273 
 1274         s = splnet();
 1275         for (i = 0; i < MF6CTBLSIZ; i++) {
 1276                 if (n6expire[i] == 0)
 1277                         continue;
 1278                 nptr = &mf6ctable[i];
 1279                 while ((mfc = *nptr) != NULL) {
 1280                         rte = mfc->mf6c_stall;
 1281                         /*
 1282                          * Skip real cache entries
 1283                          * Make sure it wasn't marked to not expire (shouldn't happen)
 1284                          * If it expires now
 1285                          */
 1286                         if (rte != NULL &&
 1287                             mfc->mf6c_expire != 0 &&
 1288                             --mfc->mf6c_expire == 0) {
 1289 #ifdef MRT6DEBUG
 1290                                 if (mrt6debug & DEBUG_EXPIRE) {
 1291                                         char ip6bufo[INET6_ADDRSTRLEN];
 1292                                         char ip6bufg[INET6_ADDRSTRLEN];
 1293                                         log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
 1294                                             ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
 1295                                             ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
 1296                                 }
 1297 #endif
 1298                                 /*
 1299                                  * drop all the packets
 1300                                  * free the mbuf with the pkt, if, timing info
 1301                                  */
 1302                                 do {
 1303                                         struct rtdetq *n = rte->next;
 1304                                         m_freem(rte->m);
 1305                                         free(rte, M_MRTABLE6);
 1306                                         rte = n;
 1307                                 } while (rte != NULL);
 1308                                 mrt6stat.mrt6s_cache_cleanups++;
 1309                                 n6expire[i]--;
 1310 
 1311                                 *nptr = mfc->mf6c_next;
 1312                                 free(mfc, M_MRTABLE6);
 1313                         } else {
 1314                                 nptr = &mfc->mf6c_next;
 1315                         }
 1316                 }
 1317         }
 1318         splx(s);
 1319         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
 1320             expire_upcalls, NULL);
 1321 }
 1322 
 1323 /*
 1324  * Packet forwarding routine once entry in the cache is made
 1325  */
 1326 static int
 1327 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
 1328 {
 1329         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1330         mifi_t mifi, iif;
 1331         struct mif6 *mifp;
 1332         int plen = m->m_pkthdr.len;
 1333         struct in6_addr src0, dst0; /* copies for local work */
 1334         u_int32_t iszone, idzone, oszone, odzone;
 1335         int error = 0;
 1336 
 1337 /*
 1338  * Macro to send packet on mif.  Since RSVP packets don't get counted on
 1339  * input, they shouldn't get counted on output, so statistics keeping is
 1340  * separate.
 1341  */
 1342 
 1343 #define MC6_SEND(ip6, mifp, m) do {                             \
 1344         if ((mifp)->m6_flags & MIFF_REGISTER)                   \
 1345                 register_send((ip6), (mifp), (m));              \
 1346         else                                                    \
 1347                 phyint_send((ip6), (mifp), (m));                \
 1348 } while (/*CONSTCOND*/ 0)
 1349 
 1350         /*
 1351          * Don't forward if it didn't arrive from the parent mif
 1352          * for its origin.
 1353          */
 1354         mifi = rt->mf6c_parent;
 1355         if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
 1356                 /* came in the wrong interface */
 1357 #ifdef MRT6DEBUG
 1358                 if (mrt6debug & DEBUG_FORWARD)
 1359                         log(LOG_DEBUG,
 1360                             "wrong if: ifid %d mifi %d mififid %x\n",
 1361                             ifp->if_index, mifi,
 1362                             mif6table[mifi].m6_ifp->if_index);
 1363 #endif
 1364                 mrt6stat.mrt6s_wrong_if++;
 1365                 rt->mf6c_wrong_if++;
 1366                 /*
 1367                  * If we are doing PIM processing, and we are forwarding
 1368                  * packets on this interface, send a message to the
 1369                  * routing daemon.
 1370                  */
 1371                 /* have to make sure this is a valid mif */
 1372                 if (mifi < nummifs && mif6table[mifi].m6_ifp)
 1373                         if (pim6 && (m->m_flags & M_LOOP) == 0) {
 1374                                 /*
 1375                                  * Check the M_LOOP flag to avoid an
 1376                                  * unnecessary PIM assert.
 1377                                  * XXX: M_LOOP is an ad-hoc hack...
 1378                                  */
 1379                                 static struct sockaddr_in6 sin6 =
 1380                                 { sizeof(sin6), AF_INET6 };
 1381 
 1382                                 struct mbuf *mm;
 1383                                 struct mrt6msg *im;
 1384 #ifdef MRT6_OINIT
 1385                                 struct omrt6msg *oim;
 1386 #endif
 1387 
 1388                                 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
 1389                                 if (mm &&
 1390                                     (M_HASCL(mm) ||
 1391                                      mm->m_len < sizeof(struct ip6_hdr)))
 1392                                         mm = m_pullup(mm, sizeof(struct ip6_hdr));
 1393                                 if (mm == NULL)
 1394                                         return (ENOBUFS);
 1395 
 1396 #ifdef MRT6_OINIT
 1397                                 oim = NULL;
 1398 #endif
 1399                                 im = NULL;
 1400                                 switch (ip6_mrouter_ver) {
 1401 #ifdef MRT6_OINIT
 1402                                 case MRT6_OINIT:
 1403                                         oim = mtod(mm, struct omrt6msg *);
 1404                                         oim->im6_msgtype = MRT6MSG_WRONGMIF;
 1405                                         oim->im6_mbz = 0;
 1406                                         break;
 1407 #endif
 1408                                 case MRT6_INIT:
 1409                                         im = mtod(mm, struct mrt6msg *);
 1410                                         im->im6_msgtype = MRT6MSG_WRONGMIF;
 1411                                         im->im6_mbz = 0;
 1412                                         break;
 1413                                 default:
 1414                                         m_freem(mm);
 1415                                         return (EINVAL);
 1416                                 }
 1417 
 1418                                 for (mifp = mif6table, iif = 0;
 1419                                      iif < nummifs && mifp &&
 1420                                              mifp->m6_ifp != ifp;
 1421                                      mifp++, iif++)
 1422                                         ;
 1423 
 1424                                 switch (ip6_mrouter_ver) {
 1425 #ifdef MRT6_OINIT
 1426                                 case MRT6_OINIT:
 1427                                         oim->im6_mif = iif;
 1428                                         sin6.sin6_addr = oim->im6_src;
 1429                                         break;
 1430 #endif
 1431                                 case MRT6_INIT:
 1432                                         im->im6_mif = iif;
 1433                                         sin6.sin6_addr = im->im6_src;
 1434                                         break;
 1435                                 }
 1436 
 1437                                 mrt6stat.mrt6s_upcalls++;
 1438 
 1439                                 if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1440 #ifdef MRT6DEBUG
 1441                                         if (mrt6debug)
 1442                                                 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
 1443 #endif
 1444                                         ++mrt6stat.mrt6s_upq_sockfull;
 1445                                         return (ENOBUFS);
 1446                                 }       /* if socket Q full */
 1447                         }               /* if PIM */
 1448                 return (0);
 1449         }                       /* if wrong iif */
 1450 
 1451         /* If I sourced this packet, it counts as output, else it was input. */
 1452         if (m->m_pkthdr.rcvif == NULL) {
 1453                 /* XXX: is rcvif really NULL when output?? */
 1454                 mif6table[mifi].m6_pkt_out++;
 1455                 mif6table[mifi].m6_bytes_out += plen;
 1456         } else {
 1457                 mif6table[mifi].m6_pkt_in++;
 1458                 mif6table[mifi].m6_bytes_in += plen;
 1459         }
 1460         rt->mf6c_pkt_cnt++;
 1461         rt->mf6c_byte_cnt += plen;
 1462 
 1463         /*
 1464          * For each mif, forward a copy of the packet if there are group
 1465          * members downstream on the interface.
 1466          */
 1467         src0 = ip6->ip6_src;
 1468         dst0 = ip6->ip6_dst;
 1469         if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
 1470             (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
 1471                 ip6stat.ip6s_badscope++;
 1472                 return (error);
 1473         }
 1474         for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
 1475                 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
 1476                         /*
 1477                          * check if the outgoing packet is going to break
 1478                          * a scope boundary.
 1479                          * XXX For packets through PIM register tunnel
 1480                          * interface, we believe a routing daemon.
 1481                          */
 1482                         if (!(mif6table[rt->mf6c_parent].m6_flags &
 1483                               MIFF_REGISTER) &&
 1484                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
 1485                                 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
 1486                                     &oszone) ||
 1487                                     in6_setscope(&dst0, mif6table[mifi].m6_ifp,
 1488                                     &odzone) ||
 1489                                     iszone != oszone ||
 1490                                     idzone != odzone) {
 1491                                         ip6stat.ip6s_badscope++;
 1492                                         continue;
 1493                                 }
 1494                         }
 1495 
 1496                         mifp->m6_pkt_out++;
 1497                         mifp->m6_bytes_out += plen;
 1498                         MC6_SEND(ip6, mifp, m);
 1499                 }
 1500         }
 1501         return (0);
 1502 }
 1503 
 1504 static void
 1505 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
 1506 {
 1507         struct mbuf *mb_copy;
 1508         struct ifnet *ifp = mifp->m6_ifp;
 1509         int error = 0;
 1510         int s = splnet();       /* needs to protect static "ro" below. */
 1511         static struct route_in6 ro;
 1512         struct  in6_multi *in6m;
 1513         struct sockaddr_in6 *dst6;
 1514         u_long linkmtu;
 1515 
 1516         /*
 1517          * Make a new reference to the packet; make sure that
 1518          * the IPv6 header is actually copied, not just referenced,
 1519          * so that ip6_output() only scribbles on the copy.
 1520          */
 1521         mb_copy = m_copy(m, 0, M_COPYALL);
 1522         if (mb_copy &&
 1523             (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
 1524                 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
 1525         if (mb_copy == NULL) {
 1526                 splx(s);
 1527                 return;
 1528         }
 1529         /* set MCAST flag to the outgoing packet */
 1530         mb_copy->m_flags |= M_MCAST;
 1531 
 1532         /*
 1533          * If we sourced the packet, call ip6_output since we may devide
 1534          * the packet into fragments when the packet is too big for the
 1535          * outgoing interface.
 1536          * Otherwise, we can simply send the packet to the interface
 1537          * sending queue.
 1538          */
 1539         if (m->m_pkthdr.rcvif == NULL) {
 1540                 struct ip6_moptions im6o;
 1541 
 1542                 im6o.im6o_multicast_ifp = ifp;
 1543                 /* XXX: ip6_output will override ip6->ip6_hlim */
 1544                 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
 1545                 im6o.im6o_multicast_loop = 1;
 1546                 error = ip6_output(mb_copy, NULL, &ro,
 1547                                    IPV6_FORWARDING, &im6o, NULL, NULL);
 1548 
 1549 #ifdef MRT6DEBUG
 1550                 if (mrt6debug & DEBUG_XMIT)
 1551                         log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
 1552                             mifp - mif6table, error);
 1553 #endif
 1554                 splx(s);
 1555                 return;
 1556         }
 1557 
 1558         /*
 1559          * If we belong to the destination multicast group
 1560          * on the outgoing interface, loop back a copy.
 1561          */
 1562         dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
 1563         IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
 1564         if (in6m != NULL) {
 1565                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1566                 dst6->sin6_family = AF_INET6;
 1567                 dst6->sin6_addr = ip6->ip6_dst;
 1568                 ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
 1569         }
 1570         /*
 1571          * Put the packet into the sending queue of the outgoing interface
 1572          * if it would fit in the MTU of the interface.
 1573          */
 1574         linkmtu = IN6_LINKMTU(ifp);
 1575         if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
 1576                 dst6->sin6_len = sizeof(struct sockaddr_in6);
 1577                 dst6->sin6_family = AF_INET6;
 1578                 dst6->sin6_addr = ip6->ip6_dst;
 1579                 /*
 1580                  * We just call if_output instead of nd6_output here, since
 1581                  * we need no ND for a multicast forwarded packet...right?
 1582                  */
 1583                 error = (*ifp->if_output)(ifp, mb_copy,
 1584                     (struct sockaddr *)&ro.ro_dst, NULL);
 1585 #ifdef MRT6DEBUG
 1586                 if (mrt6debug & DEBUG_XMIT)
 1587                         log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
 1588                             mifp - mif6table, error);
 1589 #endif
 1590         } else {
 1591                 /*
 1592                  * pMTU discovery is intentionally disabled by default, since
 1593                  * various router may notify pMTU in multicast, which can be
 1594                  * a DDoS to a router
 1595                  */
 1596                 if (ip6_mcast_pmtu)
 1597                         icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
 1598                 else {
 1599 #ifdef MRT6DEBUG
 1600                         if (mrt6debug & DEBUG_XMIT) {
 1601                                 char ip6bufs[INET6_ADDRSTRLEN];
 1602                                 char ip6bufd[INET6_ADDRSTRLEN];
 1603                                 log(LOG_DEBUG,
 1604                                     "phyint_send: packet too big on %s o %s "
 1605                                     "g %s size %d(discarded)\n",
 1606                                     if_name(ifp),
 1607                                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1608                                     ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1609                                     mb_copy->m_pkthdr.len);
 1610                         }
 1611 #endif /* MRT6DEBUG */
 1612                         m_freem(mb_copy); /* simply discard the packet */
 1613                 }
 1614         }
 1615 
 1616         splx(s);
 1617 }
 1618 
 1619 static int
 1620 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
 1621 {
 1622         struct mbuf *mm;
 1623         int i, len = m->m_pkthdr.len;
 1624         static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
 1625         struct mrt6msg *im6;
 1626 
 1627 #ifdef MRT6DEBUG
 1628         if (mrt6debug) {
 1629                 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1630                 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
 1631                     ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1632                     ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1633         }
 1634 #endif
 1635         ++pim6stat.pim6s_snd_registers;
 1636 
 1637         /* Make a copy of the packet to send to the user level process */
 1638         MGETHDR(mm, M_DONTWAIT, MT_HEADER);
 1639         if (mm == NULL)
 1640                 return (ENOBUFS);
 1641         mm->m_pkthdr.rcvif = NULL;
 1642         mm->m_data += max_linkhdr;
 1643         mm->m_len = sizeof(struct ip6_hdr);
 1644 
 1645         if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
 1646                 m_freem(mm);
 1647                 return (ENOBUFS);
 1648         }
 1649         i = MHLEN - M_LEADINGSPACE(mm);
 1650         if (i > len)
 1651                 i = len;
 1652         mm = m_pullup(mm, i);
 1653         if (mm == NULL)
 1654                 return (ENOBUFS);
 1655 /* TODO: check it! */
 1656         mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
 1657 
 1658         /*
 1659          * Send message to routing daemon
 1660          */
 1661         sin6.sin6_addr = ip6->ip6_src;
 1662 
 1663         im6 = mtod(mm, struct mrt6msg *);
 1664         im6->im6_msgtype      = MRT6MSG_WHOLEPKT;
 1665         im6->im6_mbz          = 0;
 1666 
 1667         im6->im6_mif = mif - mif6table;
 1668 
 1669         /* iif info is not given for reg. encap.n */
 1670         mrt6stat.mrt6s_upcalls++;
 1671 
 1672         if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
 1673 #ifdef MRT6DEBUG
 1674                 if (mrt6debug)
 1675                         log(LOG_WARNING,
 1676                             "register_send: ip6_mrouter socket queue full\n");
 1677 #endif
 1678                 ++mrt6stat.mrt6s_upq_sockfull;
 1679                 return (ENOBUFS);
 1680         }
 1681         return (0);
 1682 }
 1683 
 1684 /*
 1685  * PIM sparse mode hook
 1686  * Receives the pim control messages, and passes them up to the listening
 1687  * socket, using rip6_input.
 1688  * The only message processed is the REGISTER pim message; the pim header
 1689  * is stripped off, and the inner packet is passed to register_mforward.
 1690  */
 1691 int
 1692 pim6_input(struct mbuf **mp, int *offp, int proto)
 1693 {
 1694         struct pim *pim; /* pointer to a pim struct */
 1695         struct ip6_hdr *ip6;
 1696         int pimlen;
 1697         struct mbuf *m = *mp;
 1698         int minlen;
 1699         int off = *offp;
 1700 
 1701         ++pim6stat.pim6s_rcv_total;
 1702 
 1703         ip6 = mtod(m, struct ip6_hdr *);
 1704         pimlen = m->m_pkthdr.len - *offp;
 1705 
 1706         /*
 1707          * Validate lengths
 1708          */
 1709         if (pimlen < PIM_MINLEN) {
 1710                 ++pim6stat.pim6s_rcv_tooshort;
 1711 #ifdef MRT6DEBUG
 1712                 if (mrt6debug & DEBUG_PIM)
 1713                         log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
 1714 #endif
 1715                 m_freem(m);
 1716                 return (IPPROTO_DONE);
 1717         }
 1718 
 1719         /*
 1720          * if the packet is at least as big as a REGISTER, go ahead
 1721          * and grab the PIM REGISTER header size, to avoid another
 1722          * possible m_pullup() later.
 1723          *
 1724          * PIM_MINLEN       == pimhdr + u_int32 == 8
 1725          * PIM6_REG_MINLEN   == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
 1726          */
 1727         minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
 1728 
 1729         /*
 1730          * Make sure that the IP6 and PIM headers in contiguous memory, and
 1731          * possibly the PIM REGISTER header
 1732          */
 1733 #ifndef PULLDOWN_TEST
 1734         IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
 1735         /* adjust pointer */
 1736         ip6 = mtod(m, struct ip6_hdr *);
 1737 
 1738         /* adjust mbuf to point to the PIM header */
 1739         pim = (struct pim *)((caddr_t)ip6 + off);
 1740 #else
 1741         IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
 1742         if (pim == NULL) {
 1743                 pim6stat.pim6s_rcv_tooshort++;
 1744                 return (IPPROTO_DONE);
 1745         }
 1746 #endif
 1747 
 1748 #define PIM6_CHECKSUM
 1749 #ifdef PIM6_CHECKSUM
 1750         {
 1751                 int cksumlen;
 1752 
 1753                 /*
 1754                  * Validate checksum.
 1755                  * If PIM REGISTER, exclude the data packet
 1756                  */
 1757                 if (pim->pim_type == PIM_REGISTER)
 1758                         cksumlen = PIM_MINLEN;
 1759                 else
 1760                         cksumlen = pimlen;
 1761 
 1762                 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
 1763                         ++pim6stat.pim6s_rcv_badsum;
 1764 #ifdef MRT6DEBUG
 1765                         if (mrt6debug & DEBUG_PIM)
 1766                                 log(LOG_DEBUG,
 1767                                     "pim6_input: invalid checksum\n");
 1768 #endif
 1769                         m_freem(m);
 1770                         return (IPPROTO_DONE);
 1771                 }
 1772         }
 1773 #endif /* PIM_CHECKSUM */
 1774 
 1775         /* PIM version check */
 1776         if (pim->pim_ver != PIM_VERSION) {
 1777                 ++pim6stat.pim6s_rcv_badversion;
 1778 #ifdef MRT6DEBUG
 1779                 log(LOG_ERR,
 1780                     "pim6_input: incorrect version %d, expecting %d\n",
 1781                     pim->pim_ver, PIM_VERSION);
 1782 #endif
 1783                 m_freem(m);
 1784                 return (IPPROTO_DONE);
 1785         }
 1786 
 1787         if (pim->pim_type == PIM_REGISTER) {
 1788                 /*
 1789                  * since this is a REGISTER, we'll make a copy of the register
 1790                  * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
 1791                  * routing daemon.
 1792                  */
 1793                 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
 1794 
 1795                 struct mbuf *mcp;
 1796                 struct ip6_hdr *eip6;
 1797                 u_int32_t *reghdr;
 1798                 int rc;
 1799 #ifdef MRT6DEBUG
 1800                 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1801 #endif
 1802 
 1803                 ++pim6stat.pim6s_rcv_registers;
 1804 
 1805                 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
 1806 #ifdef MRT6DEBUG
 1807                         if (mrt6debug & DEBUG_PIM)
 1808                                 log(LOG_DEBUG,
 1809                                     "pim6_input: register mif not set: %d\n",
 1810                                     reg_mif_num);
 1811 #endif
 1812                         m_freem(m);
 1813                         return (IPPROTO_DONE);
 1814                 }
 1815 
 1816                 reghdr = (u_int32_t *)(pim + 1);
 1817 
 1818                 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
 1819                         goto pim6_input_to_daemon;
 1820 
 1821                 /*
 1822                  * Validate length
 1823                  */
 1824                 if (pimlen < PIM6_REG_MINLEN) {
 1825                         ++pim6stat.pim6s_rcv_tooshort;
 1826                         ++pim6stat.pim6s_rcv_badregisters;
 1827 #ifdef MRT6DEBUG
 1828                         log(LOG_ERR,
 1829                             "pim6_input: register packet size too "
 1830                             "small %d from %s\n",
 1831                             pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
 1832 #endif
 1833                         m_freem(m);
 1834                         return (IPPROTO_DONE);
 1835                 }
 1836 
 1837                 eip6 = (struct ip6_hdr *) (reghdr + 1);
 1838 #ifdef MRT6DEBUG
 1839                 if (mrt6debug & DEBUG_PIM)
 1840                         log(LOG_DEBUG,
 1841                             "pim6_input[register], eip6: %s -> %s, "
 1842                             "eip6 plen %d\n",
 1843                             ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1844                             ip6_sprintf(ip6bufd, &eip6->ip6_dst),
 1845                             ntohs(eip6->ip6_plen));
 1846 #endif
 1847 
 1848                 /* verify the version number of the inner packet */
 1849                 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
 1850                         ++pim6stat.pim6s_rcv_badregisters;
 1851 #ifdef MRT6DEBUG
 1852                         log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
 1853                             "of the inner packet\n",
 1854                             (eip6->ip6_vfc & IPV6_VERSION));
 1855 #endif
 1856                         m_freem(m);
 1857                         return (IPPROTO_NONE);
 1858                 }
 1859 
 1860                 /* verify the inner packet is destined to a mcast group */
 1861                 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
 1862                         ++pim6stat.pim6s_rcv_badregisters;
 1863 #ifdef MRT6DEBUG
 1864                         if (mrt6debug & DEBUG_PIM)
 1865                                 log(LOG_DEBUG,
 1866                                     "pim6_input: inner packet of register "
 1867                                     "is not multicast %s\n",
 1868                                     ip6_sprintf(ip6bufd, &eip6->ip6_dst));
 1869 #endif
 1870                         m_freem(m);
 1871                         return (IPPROTO_DONE);
 1872                 }
 1873 
 1874                 /*
 1875                  * make a copy of the whole header to pass to the daemon later.
 1876                  */
 1877                 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
 1878                 if (mcp == NULL) {
 1879 #ifdef MRT6DEBUG
 1880                         log(LOG_ERR,
 1881                             "pim6_input: pim register: "
 1882                             "could not copy register head\n");
 1883 #endif
 1884                         m_freem(m);
 1885                         return (IPPROTO_DONE);
 1886                 }
 1887 
 1888                 /*
 1889                  * forward the inner ip6 packet; point m_data at the inner ip6.
 1890                  */
 1891                 m_adj(m, off + PIM_MINLEN);
 1892 #ifdef MRT6DEBUG
 1893                 if (mrt6debug & DEBUG_PIM) {
 1894                         log(LOG_DEBUG,
 1895                             "pim6_input: forwarding decapsulated register: "
 1896                             "src %s, dst %s, mif %d\n",
 1897                             ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1898                             ip6_sprintf(ip6bufd, &eip6->ip6_dst),
 1899                             reg_mif_num);
 1900                 }
 1901 #endif
 1902 
 1903                 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
 1904                                 dst.sin6_family, 0);
 1905 
 1906                 /* prepare the register head to send to the mrouting daemon */
 1907                 m = mcp;
 1908         }
 1909 
 1910         /*
 1911          * Pass the PIM message up to the daemon; if it is a register message
 1912          * pass the 'head' only up to the daemon. This includes the
 1913          * encapsulator ip6 header, pim header, register header and the
 1914          * encapsulated ip6 header.
 1915          */
 1916   pim6_input_to_daemon:
 1917         rip6_input(&m, offp, proto);
 1918         return (IPPROTO_DONE);
 1919 }

Cache object: 3b4c62b26ea2f048afa299f6c3022322


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