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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (C) 1998 WIDE Project.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the project nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
   32  */
   33 
   34 /*-
   35  * Copyright (c) 1989 Stephen Deering
   36  * Copyright (c) 1992, 1993
   37  *      The Regents of the University of California.  All rights reserved.
   38  *
   39  * This code is derived from software contributed to Berkeley by
   40  * Stephen Deering of Stanford University.
   41  *
   42  * Redistribution and use in source and binary forms, with or without
   43  * modification, are permitted provided that the following conditions
   44  * are met:
   45  * 1. Redistributions of source code must retain the above copyright
   46  *    notice, this list of conditions and the following disclaimer.
   47  * 2. Redistributions in binary form must reproduce the above copyright
   48  *    notice, this list of conditions and the following disclaimer in the
   49  *    documentation and/or other materials provided with the distribution.
   50  * 3. Neither the name of the University nor the names of its contributors
   51  *    may be used to endorse or promote products derived from this software
   52  *    without specific prior written permission.
   53  *
   54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   64  * SUCH DAMAGE.
   65  *
   66  *      @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
   67  *      BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp
   68  */
   69 
   70 /*
   71  * IP multicast forwarding procedures
   72  *
   73  * Written by David Waitzman, BBN Labs, August 1988.
   74  * Modified by Steve Deering, Stanford, February 1989.
   75  * Modified by Mark J. Steiglitz, Stanford, May, 1991
   76  * Modified by Van Jacobson, LBL, January 1993
   77  * Modified by Ajit Thyagarajan, PARC, August 1993
   78  * Modified by Bill Fenner, PARC, April 1994
   79  *
   80  * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
   81  */
   82 
   83 #include <sys/cdefs.h>
   84 __FBSDID("$FreeBSD$");
   85 
   86 #include "opt_inet6.h"
   87 
   88 #include <sys/param.h>
   89 #include <sys/callout.h>
   90 #include <sys/errno.h>
   91 #include <sys/kernel.h>
   92 #include <sys/lock.h>
   93 #include <sys/malloc.h>
   94 #include <sys/mbuf.h>
   95 #include <sys/module.h>
   96 #include <sys/domain.h>
   97 #include <sys/protosw.h>
   98 #include <sys/sdt.h>
   99 #include <sys/signalvar.h>
  100 #include <sys/socket.h>
  101 #include <sys/socketvar.h>
  102 #include <sys/sockio.h>
  103 #include <sys/sx.h>
  104 #include <sys/sysctl.h>
  105 #include <sys/syslog.h>
  106 #include <sys/systm.h>
  107 #include <sys/time.h>
  108 
  109 #include <net/if.h>
  110 #include <net/if_var.h>
  111 #include <net/if_types.h>
  112 #include <net/vnet.h>
  113 
  114 #include <netinet/in.h>
  115 #include <netinet/in_var.h>
  116 #include <netinet/icmp6.h>
  117 #include <netinet/ip_encap.h>
  118 
  119 #include <netinet/ip6.h>
  120 #include <netinet/in_kdtrace.h>
  121 #include <netinet6/ip6_var.h>
  122 #include <netinet6/scope6_var.h>
  123 #include <netinet6/nd6.h>
  124 #include <netinet6/ip6_mroute.h>
  125 #include <netinet6/pim6.h>
  126 #include <netinet6/pim6_var.h>
  127 
  128 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
  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 int pim6_encapcheck(const struct mbuf *, int, int, void *);
  142 static int pim6_input(struct mbuf *, int, int, void *);
  143 
  144 static const struct encap_config ipv6_encap_cfg = {
  145         .proto = IPPROTO_PIM,
  146         .min_length = sizeof(struct ip6_hdr) + PIM_MINLEN,
  147         .exact_match = 8,
  148         .check = pim6_encapcheck,
  149         .input = pim6_input
  150 };
  151 
  152 VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0;
  153 #define V_ip6_mrouter_ver       VNET(ip6_mrouter_ver)
  154 
  155 SYSCTL_DECL(_net_inet6);
  156 SYSCTL_DECL(_net_inet6_ip6);
  157 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim,
  158     CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
  159     "PIM");
  160 
  161 static struct mrt6stat mrt6stat;
  162 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
  163     &mrt6stat, mrt6stat,
  164     "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
  165 
  166 #define MRT6STAT_INC(name)      mrt6stat.name += 1
  167 #define NO_RTE_FOUND    0x1
  168 #define RTE_FOUND       0x2
  169 
  170 static struct sx mrouter6_mtx;
  171 #define MROUTER6_LOCKPTR()      (&mrouter6_mtx)
  172 #define MROUTER6_LOCK()         sx_xlock(MROUTER6_LOCKPTR())
  173 #define MROUTER6_UNLOCK()       sx_xunlock(MROUTER6_LOCKPTR())
  174 #define MROUTER6_LOCK_ASSERT()  sx_assert(MROUTER6_LOCKPTR(), SA_XLOCKED
  175 #define MROUTER6_LOCK_INIT()    sx_init(MROUTER6_LOCKPTR(), "mrouter6")
  176 #define MROUTER6_LOCK_DESTROY() sx_destroy(MROUTER6_LOCKPTR())
  177 
  178 static struct mf6c *mf6ctable[MF6CTBLSIZ];
  179 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
  180     &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
  181     "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
  182     "netinet6/ip6_mroute.h)");
  183 
  184 static struct mtx mfc6_mtx;
  185 #define MFC6_LOCKPTR()          (&mfc6_mtx)
  186 #define MFC6_LOCK()             mtx_lock(MFC6_LOCKPTR())
  187 #define MFC6_UNLOCK()           mtx_unlock(MFC6_LOCKPTR())
  188 #define MFC6_LOCK_ASSERT()      mtx_assert(MFC6_LOCKPTR(), MA_OWNED)
  189 #define MFC6_LOCK_INIT()        mtx_init(MFC6_LOCKPTR(),                \
  190                                     "IPv6 multicast forwarding cache",  \
  191                                     NULL, MTX_DEF)
  192 #define MFC6_LOCK_DESTROY()     mtx_destroy(MFC6_LOCKPTR())
  193 
  194 static u_char n6expire[MF6CTBLSIZ];
  195 
  196 static struct mif6 mif6table[MAXMIFS];
  197 static int
  198 sysctl_mif6table(SYSCTL_HANDLER_ARGS)
  199 {
  200         struct mif6_sctl *out;
  201         int error;
  202 
  203         out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
  204             M_WAITOK | M_ZERO);
  205         for (int i = 0; i < MAXMIFS; i++) {
  206                 out[i].m6_flags         = mif6table[i].m6_flags;
  207                 out[i].m6_rate_limit    = mif6table[i].m6_rate_limit;
  208                 out[i].m6_lcl_addr      = mif6table[i].m6_lcl_addr;
  209                 if (mif6table[i].m6_ifp != NULL)
  210                         out[i].m6_ifp   = mif6table[i].m6_ifp->if_index;
  211                 else
  212                         out[i].m6_ifp   = 0;
  213                 out[i].m6_pkt_in        = mif6table[i].m6_pkt_in;
  214                 out[i].m6_pkt_out       = mif6table[i].m6_pkt_out;
  215                 out[i].m6_bytes_in      = mif6table[i].m6_bytes_in;
  216                 out[i].m6_bytes_out     = mif6table[i].m6_bytes_out;
  217         }
  218         error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
  219         free(out, M_TEMP);
  220         return (error);
  221 }
  222 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table,
  223     CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
  224     NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
  225     "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
  226     "netinet6/ip6_mroute.h)");
  227 
  228 static struct mtx mif6_mtx;
  229 #define MIF6_LOCKPTR()          (&mif6_mtx)
  230 #define MIF6_LOCK()             mtx_lock(MIF6_LOCKPTR())
  231 #define MIF6_UNLOCK()           mtx_unlock(MIF6_LOCKPTR())
  232 #define MIF6_LOCK_ASSERT()      mtx_assert(MIF6_LOCKPTR(), MA_OWNED)
  233 #define MIF6_LOCK_INIT()        \
  234         mtx_init(MIF6_LOCKPTR(), "IPv6 multicast interfaces", NULL, MTX_DEF)
  235 #define MIF6_LOCK_DESTROY()     mtx_destroy(MIF6_LOCKPTR())
  236 
  237 #ifdef MRT6DEBUG
  238 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0;       /* debug level */
  239 #define V_mrt6debug             VNET(mrt6debug)
  240 #define DEBUG_MFC       0x02
  241 #define DEBUG_FORWARD   0x04
  242 #define DEBUG_EXPIRE    0x08
  243 #define DEBUG_XMIT      0x10
  244 #define DEBUG_REG       0x20
  245 #define DEBUG_PIM       0x40
  246 #define DEBUG_ERR       0x80
  247 #define DEBUG_ANY       0x7f
  248 #define MRT6_DLOG(m, fmt, ...)  \
  249         if (V_mrt6debug & (m))  \
  250                 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
  251                     "%s: " fmt "\n", __func__, ##__VA_ARGS__)
  252 #else
  253 #define MRT6_DLOG(m, fmt, ...)
  254 #endif
  255 
  256 static void     expire_upcalls(void *);
  257 #define EXPIRE_TIMEOUT  (hz / 4)        /* 4x / second */
  258 #define UPCALL_EXPIRE   6               /* number of timeouts */
  259 
  260 /*
  261  * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
  262  */
  263 
  264 /*
  265  * 'Interfaces' associated with decapsulator (so we can tell
  266  * packets that went through it from ones that get reflected
  267  * by a broken gateway).  Different from IPv4 register_if,
  268  * these interfaces are linked into the system ifnet list,
  269  * because per-interface IPv6 statistics are maintained in
  270  * ifp->if_afdata.  But it does not have any routes point
  271  * to them.  I.e., packets can't be sent this way.  They
  272  * only exist as a placeholder for multicast source
  273  * verification.
  274  */
  275 static struct ifnet *multicast_register_if6;
  276 
  277 #define ENCAP_HOPS 64
  278 
  279 /*
  280  * Private variables.
  281  */
  282 static mifi_t nummifs = 0;
  283 static mifi_t reg_mif_num = (mifi_t)-1;
  284 
  285 static struct pim6stat pim6stat;
  286 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
  287     &pim6stat, pim6stat,
  288     "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
  289 
  290 #define PIM6STAT_INC(name)      pim6stat.name += 1
  291 VNET_DEFINE_STATIC(int, pim6);
  292 #define V_pim6          VNET(pim6)
  293 
  294 /*
  295  * Hash function for a source, group entry
  296  */
  297 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
  298                                    (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
  299                                    (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
  300                                    (g).s6_addr32[2] ^ (g).s6_addr32[3])
  301 
  302 /*
  303  * Find a route for a given origin IPv6 address and Multicast group address.
  304  */
  305 #define MF6CFIND(o, g, rt) do { \
  306         struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
  307         rt = NULL; \
  308         while (_rt) { \
  309                 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
  310                     IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
  311                     (_rt->mf6c_stall == NULL)) { \
  312                         rt = _rt; \
  313                         break; \
  314                 } \
  315                 _rt = _rt->mf6c_next; \
  316         } \
  317         if (rt == NULL) { \
  318                 MRT6STAT_INC(mrt6s_mfc_misses); \
  319         } \
  320 } while (/*CONSTCOND*/ 0)
  321 
  322 /*
  323  * Macros to compute elapsed time efficiently
  324  * Borrowed from Van Jacobson's scheduling code
  325  * XXX: replace with timersub() ?
  326  */
  327 #define TV_DELTA(a, b, delta) do { \
  328             int xxs; \
  329                 \
  330             delta = (a).tv_usec - (b).tv_usec; \
  331             if ((xxs = (a).tv_sec - (b).tv_sec)) { \
  332                switch (xxs) { \
  333                       case 2: \
  334                           delta += 1000000; \
  335                               /* FALLTHROUGH */ \
  336                       case 1: \
  337                           delta += 1000000; \
  338                           break; \
  339                       default: \
  340                           delta += (1000000 * xxs); \
  341                } \
  342             } \
  343 } while (/*CONSTCOND*/ 0)
  344 
  345 /* XXX: replace with timercmp(a, b, <) ? */
  346 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
  347               (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
  348 
  349 #ifdef UPCALL_TIMING
  350 #define UPCALL_MAX      50
  351 static u_long upcall_data[UPCALL_MAX + 1];
  352 static void collate();
  353 #endif /* UPCALL_TIMING */
  354 
  355 static int ip6_mrouter_init(struct socket *, int, int);
  356 static int add_m6fc(struct mf6cctl *);
  357 static int add_m6if(struct mif6ctl *);
  358 static int del_m6fc(struct mf6cctl *);
  359 static int del_m6if(mifi_t *);
  360 static int del_m6if_locked(mifi_t *);
  361 static int get_mif6_cnt(struct sioc_mif_req6 *);
  362 static int get_sg_cnt(struct sioc_sg_req6 *);
  363 
  364 static struct callout expire_upcalls_ch;
  365 
  366 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
  367 int X_ip6_mrouter_done(void);
  368 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
  369 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
  370 int X_mrt6_ioctl(u_long, caddr_t);
  371 
  372 /*
  373  * Handle MRT setsockopt commands to modify the multicast routing tables.
  374  */
  375 int
  376 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
  377 {
  378         int error = 0;
  379         int optval;
  380         struct mif6ctl mifc;
  381         struct mf6cctl mfcc;
  382         mifi_t mifi;
  383 
  384         if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
  385                 return (EPERM);
  386 
  387         switch (sopt->sopt_name) {
  388         case MRT6_INIT:
  389 #ifdef MRT6_OINIT
  390         case MRT6_OINIT:
  391 #endif
  392                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  393                     sizeof(optval));
  394                 if (error)
  395                         break;
  396                 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
  397                 break;
  398         case MRT6_DONE:
  399                 error = X_ip6_mrouter_done();
  400                 break;
  401         case MRT6_ADD_MIF:
  402                 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
  403                 if (error)
  404                         break;
  405                 error = add_m6if(&mifc);
  406                 break;
  407         case MRT6_ADD_MFC:
  408                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  409                 if (error)
  410                         break;
  411                 error = add_m6fc(&mfcc);
  412                 break;
  413         case MRT6_DEL_MFC:
  414                 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
  415                 if (error)
  416                         break;
  417                 error = del_m6fc(&mfcc);
  418                 break;
  419         case MRT6_DEL_MIF:
  420                 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
  421                 if (error)
  422                         break;
  423                 error = del_m6if(&mifi);
  424                 break;
  425         case MRT6_PIM:
  426                 error = sooptcopyin(sopt, &optval, sizeof(optval),
  427                     sizeof(optval));
  428                 if (error)
  429                         break;
  430                 error = set_pim6(&optval);
  431                 break;
  432         default:
  433                 error = EOPNOTSUPP;
  434                 break;
  435         }
  436 
  437         return (error);
  438 }
  439 
  440 /*
  441  * Handle MRT getsockopt commands
  442  */
  443 int
  444 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
  445 {
  446         int error = 0;
  447 
  448         if (so != V_ip6_mrouter)
  449                 return (EACCES);
  450 
  451         switch (sopt->sopt_name) {
  452                 case MRT6_PIM:
  453                         error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
  454                         break;
  455         }
  456         return (error);
  457 }
  458 
  459 /*
  460  * Handle ioctl commands to obtain information from the cache
  461  */
  462 int
  463 X_mrt6_ioctl(u_long cmd, caddr_t data)
  464 {
  465         int ret;
  466 
  467         ret = EINVAL;
  468 
  469         switch (cmd) {
  470         case SIOCGETSGCNT_IN6:
  471                 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
  472                 break;
  473 
  474         case SIOCGETMIFCNT_IN6:
  475                 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
  476                 break;
  477 
  478         default:
  479                 break;
  480         }
  481 
  482         return (ret);
  483 }
  484 
  485 /*
  486  * returns the packet, byte, rpf-failure count for the source group provided
  487  */
  488 static int
  489 get_sg_cnt(struct sioc_sg_req6 *req)
  490 {
  491         struct mf6c *rt;
  492         int ret;
  493 
  494         ret = 0;
  495 
  496         MFC6_LOCK();
  497 
  498         MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
  499         if (rt == NULL) {
  500                 ret = ESRCH;
  501         } else {
  502                 req->pktcnt = rt->mf6c_pkt_cnt;
  503                 req->bytecnt = rt->mf6c_byte_cnt;
  504                 req->wrong_if = rt->mf6c_wrong_if;
  505         }
  506 
  507         MFC6_UNLOCK();
  508 
  509         return (ret);
  510 }
  511 
  512 /*
  513  * returns the input and output packet and byte counts on the mif provided
  514  */
  515 static int
  516 get_mif6_cnt(struct sioc_mif_req6 *req)
  517 {
  518         mifi_t mifi;
  519         int ret;
  520 
  521         ret = 0;
  522         mifi = req->mifi;
  523 
  524         MIF6_LOCK();
  525 
  526         if (mifi >= nummifs) {
  527                 ret = EINVAL;
  528         } else {
  529                 req->icount = mif6table[mifi].m6_pkt_in;
  530                 req->ocount = mif6table[mifi].m6_pkt_out;
  531                 req->ibytes = mif6table[mifi].m6_bytes_in;
  532                 req->obytes = mif6table[mifi].m6_bytes_out;
  533         }
  534 
  535         MIF6_UNLOCK();
  536 
  537         return (ret);
  538 }
  539 
  540 static int
  541 set_pim6(int *i)
  542 {
  543         if ((*i != 1) && (*i != 0))
  544                 return (EINVAL);
  545 
  546         V_pim6 = *i;
  547 
  548         return (0);
  549 }
  550 
  551 /*
  552  * Enable multicast routing
  553  */
  554 static int
  555 ip6_mrouter_init(struct socket *so, int v, int cmd)
  556 {
  557 
  558         MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
  559             so->so_type, so->so_proto->pr_protocol);
  560 
  561         if (so->so_type != SOCK_RAW ||
  562             so->so_proto->pr_protocol != IPPROTO_ICMPV6)
  563                 return (EOPNOTSUPP);
  564 
  565         if (v != 1)
  566                 return (ENOPROTOOPT);
  567 
  568         MROUTER6_LOCK();
  569 
  570         if (V_ip6_mrouter != NULL) {
  571                 MROUTER6_UNLOCK();
  572                 return (EADDRINUSE);
  573         }
  574 
  575         V_ip6_mrouter = so;
  576         V_ip6_mrouter_ver = cmd;
  577 
  578         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  579         bzero((caddr_t)n6expire, sizeof(n6expire));
  580 
  581         V_pim6 = 0;/* used for stubbing out/in pim stuff */
  582 
  583         callout_init_mtx(&expire_upcalls_ch, MFC6_LOCKPTR(), 0);
  584         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
  585             expire_upcalls, NULL);
  586 
  587         MROUTER6_UNLOCK();
  588 
  589         MRT6_DLOG(DEBUG_ANY, "finished");
  590 
  591         return (0);
  592 }
  593 
  594 /*
  595  * Disable IPv6 multicast forwarding.
  596  */
  597 int
  598 X_ip6_mrouter_done(void)
  599 {
  600         mifi_t mifi;
  601         u_long i;
  602         struct mf6c *rt;
  603         struct rtdetq *rte;
  604 
  605         MROUTER6_LOCK();
  606 
  607         if (V_ip6_mrouter == NULL) {
  608                 MROUTER6_UNLOCK();
  609                 return (EINVAL);
  610         }
  611 
  612         /*
  613          * For each phyint in use, disable promiscuous reception of all IPv6
  614          * multicasts.
  615          */
  616         for (mifi = 0; mifi < nummifs; mifi++) {
  617                 if (mif6table[mifi].m6_ifp &&
  618                     !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
  619                         if_allmulti(mif6table[mifi].m6_ifp, 0);
  620                 }
  621         }
  622         bzero((caddr_t)mif6table, sizeof(mif6table));
  623         nummifs = 0;
  624 
  625         V_pim6 = 0; /* used to stub out/in pim specific code */
  626 
  627         /*
  628          * Free all multicast forwarding cache entries.
  629          */
  630         MFC6_LOCK();
  631         for (i = 0; i < MF6CTBLSIZ; i++) {
  632                 rt = mf6ctable[i];
  633                 while (rt) {
  634                         struct mf6c *frt;
  635 
  636                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  637                                 struct rtdetq *n = rte->next;
  638 
  639                                 m_freem(rte->m);
  640                                 free(rte, M_MRTABLE6);
  641                                 rte = n;
  642                         }
  643                         frt = rt;
  644                         rt = rt->mf6c_next;
  645                         free(frt, M_MRTABLE6);
  646                 }
  647         }
  648         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  649         MFC6_UNLOCK();
  650 
  651         callout_drain(&expire_upcalls_ch);
  652 
  653         /*
  654          * Reset register interface
  655          */
  656         if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
  657                 if_detach(multicast_register_if6);
  658                 if_free(multicast_register_if6);
  659                 reg_mif_num = (mifi_t)-1;
  660                 multicast_register_if6 = NULL;
  661         }
  662 
  663         V_ip6_mrouter = NULL;
  664         V_ip6_mrouter_ver = 0;
  665 
  666         MROUTER6_UNLOCK();
  667         MRT6_DLOG(DEBUG_ANY, "finished");
  668 
  669         return (0);
  670 }
  671 
  672 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
  673 
  674 /*
  675  * Add a mif to the mif table
  676  */
  677 static int
  678 add_m6if(struct mif6ctl *mifcp)
  679 {
  680         struct mif6 *mifp;
  681         struct ifnet *ifp;
  682         int error;
  683 
  684         MIF6_LOCK();
  685 
  686         if (mifcp->mif6c_mifi >= MAXMIFS) {
  687                 MIF6_UNLOCK();
  688                 return (EINVAL);
  689         }
  690         mifp = mif6table + mifcp->mif6c_mifi;
  691         if (mifp->m6_ifp != NULL) {
  692                 MIF6_UNLOCK();
  693                 return (EADDRINUSE); /* XXX: is it appropriate? */
  694         }
  695         if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
  696                 MIF6_UNLOCK();
  697                 return (ENXIO);
  698         }
  699 
  700         ifp = ifnet_byindex(mifcp->mif6c_pifi);
  701 
  702         if (mifcp->mif6c_flags & MIFF_REGISTER) {
  703                 if (reg_mif_num == (mifi_t)-1) {
  704                         ifp = if_alloc(IFT_OTHER);
  705 
  706                         if_initname(ifp, "register_mif", 0);
  707                         ifp->if_flags |= IFF_LOOPBACK;
  708                         if_attach(ifp);
  709                         multicast_register_if6 = ifp;
  710                         reg_mif_num = mifcp->mif6c_mifi;
  711                         /*
  712                          * it is impossible to guess the ifindex of the
  713                          * register interface.  So mif6c_pifi is automatically
  714                          * calculated.
  715                          */
  716                         mifcp->mif6c_pifi = ifp->if_index;
  717                 } else {
  718                         ifp = multicast_register_if6;
  719                 }
  720         } else {
  721                 /* Make sure the interface supports multicast */
  722                 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
  723                         MIF6_UNLOCK();
  724                         return (EOPNOTSUPP);
  725                 }
  726 
  727                 error = if_allmulti(ifp, 1);
  728                 if (error) {
  729                         MIF6_UNLOCK();
  730                         return (error);
  731                 }
  732         }
  733 
  734         mifp->m6_flags     = mifcp->mif6c_flags;
  735         mifp->m6_ifp       = ifp;
  736 
  737         /* initialize per mif pkt counters */
  738         mifp->m6_pkt_in    = 0;
  739         mifp->m6_pkt_out   = 0;
  740         mifp->m6_bytes_in  = 0;
  741         mifp->m6_bytes_out = 0;
  742 
  743         /* Adjust nummifs up if the mifi is higher than nummifs */
  744         if (nummifs <= mifcp->mif6c_mifi)
  745                 nummifs = mifcp->mif6c_mifi + 1;
  746 
  747         MIF6_UNLOCK();
  748         MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
  749             if_name(ifp));
  750 
  751         return (0);
  752 }
  753 
  754 /*
  755  * Delete a mif from the mif table
  756  */
  757 static int
  758 del_m6if_locked(mifi_t *mifip)
  759 {
  760         struct mif6 *mifp = mif6table + *mifip;
  761         mifi_t mifi;
  762         struct ifnet *ifp;
  763 
  764         MIF6_LOCK_ASSERT();
  765 
  766         if (*mifip >= nummifs)
  767                 return (EINVAL);
  768         if (mifp->m6_ifp == NULL)
  769                 return (EINVAL);
  770 
  771         if (!(mifp->m6_flags & MIFF_REGISTER)) {
  772                 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
  773                 ifp = mifp->m6_ifp;
  774                 if_allmulti(ifp, 0);
  775         } else {
  776                 if (reg_mif_num != (mifi_t)-1 &&
  777                     multicast_register_if6 != NULL) {
  778                         if_detach(multicast_register_if6);
  779                         if_free(multicast_register_if6);
  780                         reg_mif_num = (mifi_t)-1;
  781                         multicast_register_if6 = NULL;
  782                 }
  783         }
  784 
  785         bzero((caddr_t)mifp, sizeof(*mifp));
  786 
  787         /* Adjust nummifs down */
  788         for (mifi = nummifs; mifi > 0; mifi--)
  789                 if (mif6table[mifi - 1].m6_ifp)
  790                         break;
  791         nummifs = mifi;
  792         MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
  793 
  794         return (0);
  795 }
  796 
  797 static int
  798 del_m6if(mifi_t *mifip)
  799 {
  800         int cc;
  801 
  802         MIF6_LOCK();
  803         cc = del_m6if_locked(mifip);
  804         MIF6_UNLOCK();
  805 
  806         return (cc);
  807 }
  808 
  809 /*
  810  * Add an mfc entry
  811  */
  812 static int
  813 add_m6fc(struct mf6cctl *mfccp)
  814 {
  815         struct mf6c *rt;
  816         u_long hash;
  817         struct rtdetq *rte;
  818         u_short nstl;
  819         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  820 
  821         MFC6_LOCK();
  822 
  823         MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
  824                  mfccp->mf6cc_mcastgrp.sin6_addr, rt);
  825 
  826         /* If an entry already exists, just update the fields */
  827         if (rt) {
  828                 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
  829                     ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  830                     ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  831                     mfccp->mf6cc_parent);
  832 
  833                 rt->mf6c_parent = mfccp->mf6cc_parent;
  834                 rt->mf6c_ifset = mfccp->mf6cc_ifset;
  835 
  836                 MFC6_UNLOCK();
  837                 return (0);
  838         }
  839 
  840         /*
  841          * Find the entry for which the upcall was made and update
  842          */
  843         hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
  844                         mfccp->mf6cc_mcastgrp.sin6_addr);
  845         for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
  846                 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  847                                        &mfccp->mf6cc_origin.sin6_addr) &&
  848                     IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  849                                        &mfccp->mf6cc_mcastgrp.sin6_addr) &&
  850                     (rt->mf6c_stall != NULL)) {
  851                         if (nstl++)
  852                                 log(LOG_ERR,
  853                                     "add_m6fc: %s o %s g %s p %x dbx %p\n",
  854                                     "multiple kernel entries",
  855                                     ip6_sprintf(ip6bufo,
  856                                             &mfccp->mf6cc_origin.sin6_addr),
  857                                     ip6_sprintf(ip6bufg,
  858                                             &mfccp->mf6cc_mcastgrp.sin6_addr),
  859                                     mfccp->mf6cc_parent, rt->mf6c_stall);
  860 
  861                         MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
  862                             ip6_sprintf(ip6bufo,
  863                             &mfccp->mf6cc_origin.sin6_addr),
  864                             ip6_sprintf(ip6bufg,
  865                                 &mfccp->mf6cc_mcastgrp.sin6_addr),
  866                             mfccp->mf6cc_parent, rt->mf6c_stall);
  867 
  868                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  869                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  870                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  871                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  872                         /* initialize pkt counters per src-grp */
  873                         rt->mf6c_pkt_cnt    = 0;
  874                         rt->mf6c_byte_cnt   = 0;
  875                         rt->mf6c_wrong_if   = 0;
  876 
  877                         rt->mf6c_expire = 0;    /* Don't clean this guy up */
  878                         n6expire[hash]--;
  879 
  880                         /* free packets Qed at the end of this entry */
  881                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  882                                 struct rtdetq *n = rte->next;
  883                                 ip6_mdq(rte->m, rte->ifp, rt);
  884                                 m_freem(rte->m);
  885 #ifdef UPCALL_TIMING
  886                                 collate(&(rte->t));
  887 #endif /* UPCALL_TIMING */
  888                                 free(rte, M_MRTABLE6);
  889                                 rte = n;
  890                         }
  891                         rt->mf6c_stall = NULL;
  892                 }
  893         }
  894 
  895         /*
  896          * It is possible that an entry is being inserted without an upcall
  897          */
  898         if (nstl == 0) {
  899                 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
  900                     ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  901                     ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  902                     mfccp->mf6cc_parent);
  903 
  904                 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
  905                         if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  906                                                &mfccp->mf6cc_origin.sin6_addr)&&
  907                             IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  908                                                &mfccp->mf6cc_mcastgrp.sin6_addr)) {
  909                                 rt->mf6c_origin     = mfccp->mf6cc_origin;
  910                                 rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  911                                 rt->mf6c_parent     = mfccp->mf6cc_parent;
  912                                 rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  913                                 /* initialize pkt counters per src-grp */
  914                                 rt->mf6c_pkt_cnt    = 0;
  915                                 rt->mf6c_byte_cnt   = 0;
  916                                 rt->mf6c_wrong_if   = 0;
  917 
  918                                 if (rt->mf6c_expire)
  919                                         n6expire[hash]--;
  920                                 rt->mf6c_expire    = 0;
  921                         }
  922                 }
  923                 if (rt == NULL) {
  924                         /* no upcall, so make a new entry */
  925                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
  926                                                   M_NOWAIT);
  927                         if (rt == NULL) {
  928                                 MFC6_UNLOCK();
  929                                 return (ENOBUFS);
  930                         }
  931 
  932                         /* insert new entry at head of hash chain */
  933                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  934                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  935                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  936                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  937                         /* initialize pkt counters per src-grp */
  938                         rt->mf6c_pkt_cnt    = 0;
  939                         rt->mf6c_byte_cnt   = 0;
  940                         rt->mf6c_wrong_if   = 0;
  941                         rt->mf6c_expire     = 0;
  942                         rt->mf6c_stall = NULL;
  943 
  944                         /* link into table */
  945                         rt->mf6c_next  = mf6ctable[hash];
  946                         mf6ctable[hash] = rt;
  947                 }
  948         }
  949 
  950         MFC6_UNLOCK();
  951         return (0);
  952 }
  953 
  954 #ifdef UPCALL_TIMING
  955 /*
  956  * collect delay statistics on the upcalls
  957  */
  958 static void
  959 collate(struct timeval *t)
  960 {
  961         u_long d;
  962         struct timeval tp;
  963         u_long delta;
  964 
  965         GET_TIME(tp);
  966 
  967         if (TV_LT(*t, tp))
  968         {
  969                 TV_DELTA(tp, *t, delta);
  970 
  971                 d = delta >> 10;
  972                 if (d > UPCALL_MAX)
  973                         d = UPCALL_MAX;
  974 
  975                 ++upcall_data[d];
  976         }
  977 }
  978 #endif /* UPCALL_TIMING */
  979 
  980 /*
  981  * Delete an mfc entry
  982  */
  983 static int
  984 del_m6fc(struct mf6cctl *mfccp)
  985 {
  986 #ifdef MRT6DEBUG
  987         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  988 #endif
  989         struct sockaddr_in6     origin;
  990         struct sockaddr_in6     mcastgrp;
  991         struct mf6c             *rt;
  992         struct mf6c             **nptr;
  993         u_long          hash;
  994 
  995         origin = mfccp->mf6cc_origin;
  996         mcastgrp = mfccp->mf6cc_mcastgrp;
  997         hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
  998 
  999         MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
 1000             ip6_sprintf(ip6bufo, &origin.sin6_addr),
 1001             ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
 1002 
 1003         MFC6_LOCK();
 1004 
 1005         nptr = &mf6ctable[hash];
 1006         while ((rt = *nptr) != NULL) {
 1007                 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
 1008                                        &rt->mf6c_origin.sin6_addr) &&
 1009                     IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
 1010                                        &rt->mf6c_mcastgrp.sin6_addr) &&
 1011                     rt->mf6c_stall == NULL)
 1012                         break;
 1013 
 1014                 nptr = &rt->mf6c_next;
 1015         }
 1016         if (rt == NULL) {
 1017                 MFC6_UNLOCK();
 1018                 return (EADDRNOTAVAIL);
 1019         }
 1020 
 1021         *nptr = rt->mf6c_next;
 1022         free(rt, M_MRTABLE6);
 1023 
 1024         MFC6_UNLOCK();
 1025 
 1026         return (0);
 1027 }
 1028 
 1029 static int
 1030 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
 1031 {
 1032 
 1033         if (s) {
 1034                 if (sbappendaddr(&s->so_rcv,
 1035                                  (struct sockaddr *)src,
 1036                                  mm, (struct mbuf *)0) != 0) {
 1037                         sorwakeup(s);
 1038                         return (0);
 1039                 } else
 1040                         soroverflow(s);
 1041         }
 1042         m_freem(mm);
 1043         return (-1);
 1044 }
 1045 
 1046 /*
 1047  * IPv6 multicast forwarding function. This function assumes that the packet
 1048  * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
 1049  * pointed to by "ifp", and the packet is to be relayed to other networks
 1050  * that have members of the packet's destination IPv6 multicast group.
 1051  *
 1052  * The packet is returned unscathed to the caller, unless it is
 1053  * erroneous, in which case a non-zero return value tells the caller to
 1054  * discard it.
 1055  *
 1056  * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
 1057  * this function is called in the originating context (i.e., not when
 1058  * forwarding a packet from other node).  ip6_output(), which is currently the
 1059  * only function that calls this function is called in the originating context,
 1060  * explicitly ensures this condition.  It is caller's responsibility to ensure
 1061  * that if this function is called from somewhere else in the originating
 1062  * context in the future.
 1063  */
 1064 int
 1065 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
 1066 {
 1067         struct rtdetq *rte;
 1068         struct mbuf *mb0;
 1069         struct mf6c *rt;
 1070         struct mif6 *mifp;
 1071         struct mbuf *mm;
 1072         u_long hash;
 1073         mifi_t mifi;
 1074         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1075 #ifdef UPCALL_TIMING
 1076         struct timeval tp;
 1077 
 1078         GET_TIME(tp);
 1079 #endif /* UPCALL_TIMING */
 1080 
 1081         MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
 1082             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1083             ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
 1084 
 1085         /*
 1086          * Don't forward a packet with Hop limit of zero or one,
 1087          * or a packet destined to a local-only group.
 1088          */
 1089         if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
 1090             IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
 1091                 return (0);
 1092         ip6->ip6_hlim--;
 1093 
 1094         /*
 1095          * Source address check: do not forward packets with unspecified
 1096          * source. It was discussed in July 2000, on ipngwg mailing list.
 1097          * This is rather more serious than unicast cases, because some
 1098          * MLD packets can be sent with the unspecified source address
 1099          * (although such packets must normally set 1 to the hop limit field).
 1100          */
 1101         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
 1102                 IP6STAT_INC(ip6s_cantforward);
 1103                 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
 1104                         V_ip6_log_time = time_uptime;
 1105                         log(LOG_DEBUG,
 1106                             "cannot forward "
 1107                             "from %s to %s nxt %d received on %s\n",
 1108                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1109                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1110                             ip6->ip6_nxt,
 1111                             if_name(m->m_pkthdr.rcvif));
 1112                 }
 1113                 return (0);
 1114         }
 1115 
 1116         MFC6_LOCK();
 1117 
 1118         /*
 1119          * Determine forwarding mifs from the forwarding cache table
 1120          */
 1121         MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
 1122         MRT6STAT_INC(mrt6s_mfc_lookups);
 1123 
 1124         /* Entry exists, so forward if necessary */
 1125         if (rt) {
 1126                 MFC6_UNLOCK();
 1127                 return (ip6_mdq(m, ifp, rt));
 1128         }
 1129 
 1130         /*
 1131          * If we don't have a route for packet's origin,
 1132          * Make a copy of the packet & send message to routing daemon.
 1133          */
 1134         MRT6STAT_INC(mrt6s_no_route);
 1135         MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
 1136             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1137             ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1138 
 1139         /*
 1140          * Allocate mbufs early so that we don't do extra work if we
 1141          * are just going to fail anyway.
 1142          */
 1143         rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
 1144         if (rte == NULL) {
 1145                 MFC6_UNLOCK();
 1146                 return (ENOBUFS);
 1147         }
 1148         mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT);
 1149         /*
 1150          * Pullup packet header if needed before storing it,
 1151          * as other references may modify it in the meantime.
 1152          */
 1153         if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
 1154                 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
 1155         if (mb0 == NULL) {
 1156                 free(rte, M_MRTABLE6);
 1157                 MFC6_UNLOCK();
 1158                 return (ENOBUFS);
 1159         }
 1160 
 1161         /* is there an upcall waiting for this packet? */
 1162         hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
 1163         for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
 1164                 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
 1165                     &rt->mf6c_origin.sin6_addr) &&
 1166                     IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
 1167                     &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
 1168                         break;
 1169         }
 1170 
 1171         if (rt == NULL) {
 1172                 struct mrt6msg *im;
 1173 #ifdef MRT6_OINIT
 1174                 struct omrt6msg *oim;
 1175 #endif
 1176                 /* no upcall, so make a new entry */
 1177                 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
 1178                 if (rt == NULL) {
 1179                         free(rte, M_MRTABLE6);
 1180                         m_freem(mb0);
 1181                         MFC6_UNLOCK();
 1182                         return (ENOBUFS);
 1183                 }
 1184                 /*
 1185                  * Make a copy of the header to send to the user
 1186                  * level process
 1187                  */
 1188                 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT);
 1189                 if (mm == NULL) {
 1190                         free(rte, M_MRTABLE6);
 1191                         m_freem(mb0);
 1192                         free(rt, M_MRTABLE6);
 1193                         MFC6_UNLOCK();
 1194                         return (ENOBUFS);
 1195                 }
 1196 
 1197                 /*
 1198                  * Send message to routing daemon
 1199                  */
 1200                 sin6.sin6_addr = ip6->ip6_src;
 1201                 im = NULL;
 1202 #ifdef MRT6_OINIT
 1203                 oim = NULL;
 1204 #endif
 1205                 switch (V_ip6_mrouter_ver) {
 1206 #ifdef MRT6_OINIT
 1207                 case MRT6_OINIT:
 1208                         oim = mtod(mm, struct omrt6msg *);
 1209                         oim->im6_msgtype = MRT6MSG_NOCACHE;
 1210                         oim->im6_mbz = 0;
 1211                         break;
 1212 #endif
 1213                 case MRT6_INIT:
 1214                         im = mtod(mm, struct mrt6msg *);
 1215                         im->im6_msgtype = MRT6MSG_NOCACHE;
 1216                         im->im6_mbz = 0;
 1217                         break;
 1218                 default:
 1219                         free(rte, M_MRTABLE6);
 1220                         m_freem(mb0);
 1221                         free(rt, M_MRTABLE6);
 1222                         MFC6_UNLOCK();
 1223                         return (EINVAL);
 1224                 }
 1225 
 1226                 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
 1227                 for (mifp = mif6table, mifi = 0;
 1228                     mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
 1229                                 ;
 1230 
 1231                 switch (V_ip6_mrouter_ver) {
 1232 #ifdef MRT6_OINIT
 1233                 case MRT6_OINIT:
 1234                         oim->im6_mif = mifi;
 1235                         break;
 1236 #endif
 1237                 case MRT6_INIT:
 1238                         im->im6_mif = mifi;
 1239                         break;
 1240                 }
 1241 
 1242                 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1243                         log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
 1244                             "socket queue full\n");
 1245                         MRT6STAT_INC(mrt6s_upq_sockfull);
 1246                         free(rte, M_MRTABLE6);
 1247                         m_freem(mb0);
 1248                         free(rt, M_MRTABLE6);
 1249                         MFC6_UNLOCK();
 1250                         return (ENOBUFS);
 1251                 }
 1252 
 1253                 MRT6STAT_INC(mrt6s_upcalls);
 1254 
 1255                 /* insert new entry at head of hash chain */
 1256                 bzero(rt, sizeof(*rt));
 1257                 rt->mf6c_origin.sin6_family = AF_INET6;
 1258                 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
 1259                 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
 1260                 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
 1261                 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
 1262                 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
 1263                 rt->mf6c_expire = UPCALL_EXPIRE;
 1264                 n6expire[hash]++;
 1265                 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
 1266 
 1267                 /* link into table */
 1268                 rt->mf6c_next  = mf6ctable[hash];
 1269                 mf6ctable[hash] = rt;
 1270                 /* Add this entry to the end of the queue */
 1271                 rt->mf6c_stall = rte;
 1272         } else {
 1273                 /* determine if q has overflowed */
 1274                 struct rtdetq **p;
 1275                 int npkts = 0;
 1276 
 1277                 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
 1278                         if (++npkts > MAX_UPQ6) {
 1279                                 MRT6STAT_INC(mrt6s_upq_ovflw);
 1280                                 free(rte, M_MRTABLE6);
 1281                                 m_freem(mb0);
 1282                                 MFC6_UNLOCK();
 1283                                 return (0);
 1284                         }
 1285 
 1286                 /* Add this entry to the end of the queue */
 1287                 *p = rte;
 1288         }
 1289 
 1290         rte->next = NULL;
 1291         rte->m = mb0;
 1292         rte->ifp = ifp;
 1293 #ifdef UPCALL_TIMING
 1294         rte->t = tp;
 1295 #endif /* UPCALL_TIMING */
 1296 
 1297         MFC6_UNLOCK();
 1298 
 1299         return (0);
 1300 }
 1301 
 1302 /*
 1303  * Clean up cache entries if upcalls are not serviced
 1304  * Call from the Slow Timeout mechanism, every half second.
 1305  */
 1306 static void
 1307 expire_upcalls(void *unused)
 1308 {
 1309 #ifdef MRT6DEBUG
 1310         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
 1311 #endif
 1312         struct rtdetq *rte;
 1313         struct mf6c *mfc, **nptr;
 1314         u_long i;
 1315 
 1316         MFC6_LOCK_ASSERT();
 1317 
 1318         for (i = 0; i < MF6CTBLSIZ; i++) {
 1319                 if (n6expire[i] == 0)
 1320                         continue;
 1321                 nptr = &mf6ctable[i];
 1322                 while ((mfc = *nptr) != NULL) {
 1323                         rte = mfc->mf6c_stall;
 1324                         /*
 1325                          * Skip real cache entries
 1326                          * Make sure it wasn't marked to not expire (shouldn't happen)
 1327                          * If it expires now
 1328                          */
 1329                         if (rte != NULL &&
 1330                             mfc->mf6c_expire != 0 &&
 1331                             --mfc->mf6c_expire == 0) {
 1332                                 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
 1333                                     ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
 1334                                     ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
 1335                                 /*
 1336                                  * drop all the packets
 1337                                  * free the mbuf with the pkt, if, timing info
 1338                                  */
 1339                                 do {
 1340                                         struct rtdetq *n = rte->next;
 1341                                         m_freem(rte->m);
 1342                                         free(rte, M_MRTABLE6);
 1343                                         rte = n;
 1344                                 } while (rte != NULL);
 1345                                 MRT6STAT_INC(mrt6s_cache_cleanups);
 1346                                 n6expire[i]--;
 1347 
 1348                                 *nptr = mfc->mf6c_next;
 1349                                 free(mfc, M_MRTABLE6);
 1350                         } else {
 1351                                 nptr = &mfc->mf6c_next;
 1352                         }
 1353                 }
 1354         }
 1355         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
 1356             expire_upcalls, NULL);
 1357 }
 1358 
 1359 /*
 1360  * Packet forwarding routine once entry in the cache is made
 1361  */
 1362 static int
 1363 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
 1364 {
 1365         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1366         mifi_t mifi, iif;
 1367         struct mif6 *mifp;
 1368         int plen = m->m_pkthdr.len;
 1369         struct in6_addr src0, dst0; /* copies for local work */
 1370         u_int32_t iszone, idzone, oszone, odzone;
 1371         int error = 0;
 1372 
 1373         /*
 1374          * Don't forward if it didn't arrive from the parent mif
 1375          * for its origin.
 1376          */
 1377         mifi = rt->mf6c_parent;
 1378         if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
 1379                 /* came in the wrong interface */
 1380                 MRT6_DLOG(DEBUG_FORWARD,
 1381                     "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
 1382                     mifi, mif6table[mifi].m6_ifp->if_index);
 1383                 MRT6STAT_INC(mrt6s_wrong_if);
 1384                 rt->mf6c_wrong_if++;
 1385                 /*
 1386                  * If we are doing PIM processing, and we are forwarding
 1387                  * packets on this interface, send a message to the
 1388                  * routing daemon.
 1389                  */
 1390                 /* have to make sure this is a valid mif */
 1391                 if (mifi < nummifs && mif6table[mifi].m6_ifp)
 1392                         if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
 1393                                 /*
 1394                                  * Check the M_LOOP flag to avoid an
 1395                                  * unnecessary PIM assert.
 1396                                  * XXX: M_LOOP is an ad-hoc hack...
 1397                                  */
 1398                                 static struct sockaddr_in6 sin6 =
 1399                                 { sizeof(sin6), AF_INET6 };
 1400 
 1401                                 struct mbuf *mm;
 1402                                 struct mrt6msg *im;
 1403 #ifdef MRT6_OINIT
 1404                                 struct omrt6msg *oim;
 1405 #endif
 1406 
 1407                                 mm = m_copym(m, 0, sizeof(struct ip6_hdr),
 1408                                     M_NOWAIT);
 1409                                 if (mm &&
 1410                                     (!M_WRITABLE(mm) ||
 1411                                      mm->m_len < sizeof(struct ip6_hdr)))
 1412                                         mm = m_pullup(mm, sizeof(struct ip6_hdr));
 1413                                 if (mm == NULL)
 1414                                         return (ENOBUFS);
 1415 
 1416 #ifdef MRT6_OINIT
 1417                                 oim = NULL;
 1418 #endif
 1419                                 im = NULL;
 1420                                 switch (V_ip6_mrouter_ver) {
 1421 #ifdef MRT6_OINIT
 1422                                 case MRT6_OINIT:
 1423                                         oim = mtod(mm, struct omrt6msg *);
 1424                                         oim->im6_msgtype = MRT6MSG_WRONGMIF;
 1425                                         oim->im6_mbz = 0;
 1426                                         break;
 1427 #endif
 1428                                 case MRT6_INIT:
 1429                                         im = mtod(mm, struct mrt6msg *);
 1430                                         im->im6_msgtype = MRT6MSG_WRONGMIF;
 1431                                         im->im6_mbz = 0;
 1432                                         break;
 1433                                 default:
 1434                                         m_freem(mm);
 1435                                         return (EINVAL);
 1436                                 }
 1437 
 1438                                 for (mifp = mif6table, iif = 0;
 1439                                      iif < nummifs && mifp &&
 1440                                              mifp->m6_ifp != ifp;
 1441                                      mifp++, iif++)
 1442                                         ;
 1443 
 1444                                 switch (V_ip6_mrouter_ver) {
 1445 #ifdef MRT6_OINIT
 1446                                 case MRT6_OINIT:
 1447                                         oim->im6_mif = iif;
 1448                                         sin6.sin6_addr = oim->im6_src;
 1449                                         break;
 1450 #endif
 1451                                 case MRT6_INIT:
 1452                                         im->im6_mif = iif;
 1453                                         sin6.sin6_addr = im->im6_src;
 1454                                         break;
 1455                                 }
 1456 
 1457                                 MRT6STAT_INC(mrt6s_upcalls);
 1458 
 1459                                 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1460                                         MRT6_DLOG(DEBUG_ANY,
 1461                                             "ip6_mrouter socket queue full");
 1462                                         MRT6STAT_INC(mrt6s_upq_sockfull);
 1463                                         return (ENOBUFS);
 1464                                 }       /* if socket Q full */
 1465                         }               /* if PIM */
 1466                 return (0);
 1467         }                       /* if wrong iif */
 1468 
 1469         /* If I sourced this packet, it counts as output, else it was input. */
 1470         if (m->m_pkthdr.rcvif == NULL) {
 1471                 /* XXX: is rcvif really NULL when output?? */
 1472                 mif6table[mifi].m6_pkt_out++;
 1473                 mif6table[mifi].m6_bytes_out += plen;
 1474         } else {
 1475                 mif6table[mifi].m6_pkt_in++;
 1476                 mif6table[mifi].m6_bytes_in += plen;
 1477         }
 1478         rt->mf6c_pkt_cnt++;
 1479         rt->mf6c_byte_cnt += plen;
 1480 
 1481         /*
 1482          * For each mif, forward a copy of the packet if there are group
 1483          * members downstream on the interface.
 1484          */
 1485         src0 = ip6->ip6_src;
 1486         dst0 = ip6->ip6_dst;
 1487         if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
 1488             (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
 1489                 IP6STAT_INC(ip6s_badscope);
 1490                 return (error);
 1491         }
 1492         for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
 1493                 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
 1494                         /*
 1495                          * check if the outgoing packet is going to break
 1496                          * a scope boundary.
 1497                          * XXX For packets through PIM register tunnel
 1498                          * interface, we believe a routing daemon.
 1499                          */
 1500                         if (!(mif6table[rt->mf6c_parent].m6_flags &
 1501                               MIFF_REGISTER) &&
 1502                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
 1503                                 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
 1504                                     &oszone) ||
 1505                                     in6_setscope(&dst0, mif6table[mifi].m6_ifp,
 1506                                     &odzone) ||
 1507                                     iszone != oszone ||
 1508                                     idzone != odzone) {
 1509                                         IP6STAT_INC(ip6s_badscope);
 1510                                         continue;
 1511                                 }
 1512                         }
 1513 
 1514                         mifp->m6_pkt_out++;
 1515                         mifp->m6_bytes_out += plen;
 1516                         if (mifp->m6_flags & MIFF_REGISTER)
 1517                                 register_send(ip6, mifp, m);
 1518                         else
 1519                                 phyint_send(ip6, mifp, m);
 1520                 }
 1521         }
 1522         return (0);
 1523 }
 1524 
 1525 static void
 1526 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
 1527 {
 1528 #ifdef MRT6DEBUG
 1529         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1530 #endif
 1531         struct mbuf *mb_copy;
 1532         struct ifnet *ifp = mifp->m6_ifp;
 1533         int error = 0;
 1534         u_long linkmtu;
 1535 
 1536         /*
 1537          * Make a new reference to the packet; make sure that
 1538          * the IPv6 header is actually copied, not just referenced,
 1539          * so that ip6_output() only scribbles on the copy.
 1540          */
 1541         mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
 1542         if (mb_copy &&
 1543             (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
 1544                 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
 1545         if (mb_copy == NULL) {
 1546                 return;
 1547         }
 1548         /* set MCAST flag to the outgoing packet */
 1549         mb_copy->m_flags |= M_MCAST;
 1550 
 1551         /*
 1552          * If we sourced the packet, call ip6_output since we may devide
 1553          * the packet into fragments when the packet is too big for the
 1554          * outgoing interface.
 1555          * Otherwise, we can simply send the packet to the interface
 1556          * sending queue.
 1557          */
 1558         if (m->m_pkthdr.rcvif == NULL) {
 1559                 struct ip6_moptions im6o;
 1560                 struct epoch_tracker et;
 1561 
 1562                 im6o.im6o_multicast_ifp = ifp;
 1563                 /* XXX: ip6_output will override ip6->ip6_hlim */
 1564                 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
 1565                 im6o.im6o_multicast_loop = 1;
 1566                 NET_EPOCH_ENTER(et);
 1567                 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
 1568                     NULL, NULL);
 1569                 NET_EPOCH_EXIT(et);
 1570 
 1571                 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
 1572                     (uint16_t)(mifp - mif6table), error);
 1573                 return;
 1574         }
 1575 
 1576         /*
 1577          * If configured to loop back multicasts by default,
 1578          * loop back a copy now.
 1579          */
 1580         if (in6_mcast_loop)
 1581                 ip6_mloopback(ifp, m);
 1582 
 1583         /*
 1584          * Put the packet into the sending queue of the outgoing interface
 1585          * if it would fit in the MTU of the interface.
 1586          */
 1587         linkmtu = IN6_LINKMTU(ifp);
 1588         if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
 1589                 struct sockaddr_in6 dst6;
 1590 
 1591                 bzero(&dst6, sizeof(dst6));
 1592                 dst6.sin6_len = sizeof(struct sockaddr_in6);
 1593                 dst6.sin6_family = AF_INET6;
 1594                 dst6.sin6_addr = ip6->ip6_dst;
 1595 
 1596                 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
 1597                 /*
 1598                  * We just call if_output instead of nd6_output here, since
 1599                  * we need no ND for a multicast forwarded packet...right?
 1600                  */
 1601                 m_clrprotoflags(m);     /* Avoid confusing lower layers. */
 1602                 error = (*ifp->if_output)(ifp, mb_copy,
 1603                     (struct sockaddr *)&dst6, NULL);
 1604                 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
 1605                     (uint16_t)(mifp - mif6table), error);
 1606         } else {
 1607                 /*
 1608                  * pMTU discovery is intentionally disabled by default, since
 1609                  * various router may notify pMTU in multicast, which can be
 1610                  * a DDoS to a router
 1611                  */
 1612                 if (V_ip6_mcast_pmtu)
 1613                         icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
 1614                 else {
 1615                         MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
 1616                             "g %s size %d (discarded)", if_name(ifp),
 1617                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1618                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1619                             mb_copy->m_pkthdr.len);
 1620                         m_freem(mb_copy); /* simply discard the packet */
 1621                 }
 1622         }
 1623 }
 1624 
 1625 static int
 1626 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
 1627 {
 1628 #ifdef MRT6DEBUG
 1629         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1630 #endif
 1631         struct mbuf *mm;
 1632         int i, len = m->m_pkthdr.len;
 1633         static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
 1634         struct mrt6msg *im6;
 1635 
 1636         MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
 1637             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1638             ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1639         PIM6STAT_INC(pim6s_snd_registers);
 1640 
 1641         /* Make a copy of the packet to send to the user level process. */
 1642         mm = m_gethdr(M_NOWAIT, MT_DATA);
 1643         if (mm == NULL)
 1644                 return (ENOBUFS);
 1645         mm->m_data += max_linkhdr;
 1646         mm->m_len = sizeof(struct ip6_hdr);
 1647 
 1648         if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
 1649                 m_freem(mm);
 1650                 return (ENOBUFS);
 1651         }
 1652         i = MHLEN - M_LEADINGSPACE(mm);
 1653         if (i > len)
 1654                 i = len;
 1655         mm = m_pullup(mm, i);
 1656         if (mm == NULL)
 1657                 return (ENOBUFS);
 1658 /* TODO: check it! */
 1659         mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
 1660 
 1661         /*
 1662          * Send message to routing daemon
 1663          */
 1664         sin6.sin6_addr = ip6->ip6_src;
 1665 
 1666         im6 = mtod(mm, struct mrt6msg *);
 1667         im6->im6_msgtype      = MRT6MSG_WHOLEPKT;
 1668         im6->im6_mbz          = 0;
 1669 
 1670         im6->im6_mif = mif - mif6table;
 1671 
 1672         /* iif info is not given for reg. encap.n */
 1673         MRT6STAT_INC(mrt6s_upcalls);
 1674 
 1675         if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1676                 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
 1677                 MRT6STAT_INC(mrt6s_upq_sockfull);
 1678                 return (ENOBUFS);
 1679         }
 1680         return (0);
 1681 }
 1682 
 1683 /*
 1684  * pim6_encapcheck() is called by the encap6_input() path at runtime to
 1685  * determine if a packet is for PIM; allowing PIM to be dynamically loaded
 1686  * into the kernel.
 1687  */
 1688 static int
 1689 pim6_encapcheck(const struct mbuf *m __unused, int off __unused,
 1690     int proto __unused, void *arg __unused)
 1691 {
 1692 
 1693     KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
 1694     return (8);         /* claim the datagram. */
 1695 }
 1696 
 1697 /*
 1698  * PIM sparse mode hook
 1699  * Receives the pim control messages, and passes them up to the listening
 1700  * socket, using rip6_input.
 1701  * The only message processed is the REGISTER pim message; the pim header
 1702  * is stripped off, and the inner packet is passed to register_mforward.
 1703  */
 1704 static int
 1705 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused)
 1706 {
 1707         struct pim *pim; /* pointer to a pim struct */
 1708         struct ip6_hdr *ip6;
 1709         int pimlen;
 1710         int minlen;
 1711 
 1712         PIM6STAT_INC(pim6s_rcv_total);
 1713 
 1714         /*
 1715          * Validate lengths
 1716          */
 1717         pimlen = m->m_pkthdr.len - off;
 1718         if (pimlen < PIM_MINLEN) {
 1719                 PIM6STAT_INC(pim6s_rcv_tooshort);
 1720                 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
 1721                 m_freem(m);
 1722                 return (IPPROTO_DONE);
 1723         }
 1724 
 1725         /*
 1726          * if the packet is at least as big as a REGISTER, go ahead
 1727          * and grab the PIM REGISTER header size, to avoid another
 1728          * possible m_pullup() later.
 1729          *
 1730          * PIM_MINLEN       == pimhdr + u_int32 == 8
 1731          * PIM6_REG_MINLEN   == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
 1732          */
 1733         minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
 1734 
 1735         /*
 1736          * Make sure that the IP6 and PIM headers in contiguous memory, and
 1737          * possibly the PIM REGISTER header
 1738          */
 1739         if (m->m_len < off + minlen) {
 1740                 m = m_pullup(m, off + minlen);
 1741                 if (m == NULL) {
 1742                         IP6STAT_INC(ip6s_exthdrtoolong);
 1743                         return (IPPROTO_DONE);
 1744                 }
 1745         }
 1746         ip6 = mtod(m, struct ip6_hdr *);
 1747         pim = (struct pim *)((caddr_t)ip6 + off);
 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_DONE);
 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_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT);
 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         return (rip6_input(&m, &off, proto));
 1886 }
 1887 
 1888 static int
 1889 ip6_mroute_modevent(module_t mod, int type, void *unused)
 1890 {
 1891 
 1892         switch (type) {
 1893         case MOD_LOAD:
 1894                 MROUTER6_LOCK_INIT();
 1895                 MFC6_LOCK_INIT();
 1896                 MIF6_LOCK_INIT();
 1897 
 1898                 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg,
 1899                     NULL, M_WAITOK);
 1900                 if (pim6_encap_cookie == NULL) {
 1901                         printf("ip6_mroute: unable to attach pim6 encap\n");
 1902                         MIF6_LOCK_DESTROY();
 1903                         MFC6_LOCK_DESTROY();
 1904                         MROUTER6_LOCK_DESTROY();
 1905                         return (EINVAL);
 1906                 }
 1907 
 1908                 ip6_mforward = X_ip6_mforward;
 1909                 ip6_mrouter_done = X_ip6_mrouter_done;
 1910                 ip6_mrouter_get = X_ip6_mrouter_get;
 1911                 ip6_mrouter_set = X_ip6_mrouter_set;
 1912                 mrt6_ioctl = X_mrt6_ioctl;
 1913                 break;
 1914 
 1915         case MOD_UNLOAD:
 1916                 if (V_ip6_mrouter != NULL)
 1917                         return EINVAL;
 1918 
 1919                 if (pim6_encap_cookie) {
 1920                         ip6_encap_detach(pim6_encap_cookie);
 1921                         pim6_encap_cookie = NULL;
 1922                 }
 1923                 X_ip6_mrouter_done();
 1924                 ip6_mforward = NULL;
 1925                 ip6_mrouter_done = NULL;
 1926                 ip6_mrouter_get = NULL;
 1927                 ip6_mrouter_set = NULL;
 1928                 mrt6_ioctl = NULL;
 1929 
 1930                 MIF6_LOCK_DESTROY();
 1931                 MFC6_LOCK_DESTROY();
 1932                 MROUTER6_LOCK_DESTROY();
 1933                 break;
 1934 
 1935         default:
 1936                 return (EOPNOTSUPP);
 1937         }
 1938 
 1939         return (0);
 1940 }
 1941 
 1942 static moduledata_t ip6_mroutemod = {
 1943         "ip6_mroute",
 1944         ip6_mroute_modevent,
 1945         0
 1946 };
 1947 
 1948 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);

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