The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ip6_mroute.c

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    1 /*-
    2  * Copyright (C) 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
   30  */
   31 
   32 /*-
   33  * Copyright (c) 1989 Stephen Deering
   34  * Copyright (c) 1992, 1993
   35  *      The Regents of the University of California.  All rights reserved.
   36  *
   37  * This code is derived from software contributed to Berkeley by
   38  * Stephen Deering of Stanford University.
   39  *
   40  * Redistribution and use in source and binary forms, with or without
   41  * modification, are permitted provided that the following conditions
   42  * are met:
   43  * 1. Redistributions of source code must retain the above copyright
   44  *    notice, this list of conditions and the following disclaimer.
   45  * 2. Redistributions in binary form must reproduce the above copyright
   46  *    notice, this list of conditions and the following disclaimer in the
   47  *    documentation and/or other materials provided with the distribution.
   48  * 4. Neither the name of the University nor the names of its contributors
   49  *    may be used to endorse or promote products derived from this software
   50  *    without specific prior written permission.
   51  *
   52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   62  * SUCH DAMAGE.
   63  *
   64  *      @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
   65  *      BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp
   66  */
   67 
   68 /*
   69  * IP multicast forwarding procedures
   70  *
   71  * Written by David Waitzman, BBN Labs, August 1988.
   72  * Modified by Steve Deering, Stanford, February 1989.
   73  * Modified by Mark J. Steiglitz, Stanford, May, 1991
   74  * Modified by Van Jacobson, LBL, January 1993
   75  * Modified by Ajit Thyagarajan, PARC, August 1993
   76  * Modified by Bill Fenner, PARC, April 1994
   77  *
   78  * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
   79  */
   80 
   81 #include <sys/cdefs.h>
   82 __FBSDID("$FreeBSD$");
   83 
   84 #include "opt_inet6.h"
   85 
   86 #include <sys/param.h>
   87 #include <sys/callout.h>
   88 #include <sys/errno.h>
   89 #include <sys/kernel.h>
   90 #include <sys/lock.h>
   91 #include <sys/malloc.h>
   92 #include <sys/mbuf.h>
   93 #include <sys/module.h>
   94 #include <sys/domain.h>
   95 #include <sys/protosw.h>
   96 #include <sys/sdt.h>
   97 #include <sys/signalvar.h>
   98 #include <sys/socket.h>
   99 #include <sys/socketvar.h>
  100 #include <sys/sockio.h>
  101 #include <sys/sx.h>
  102 #include <sys/sysctl.h>
  103 #include <sys/syslog.h>
  104 #include <sys/systm.h>
  105 #include <sys/time.h>
  106 
  107 #include <net/if.h>
  108 #include <net/if_var.h>
  109 #include <net/if_types.h>
  110 #include <net/raw_cb.h>
  111 #include <net/vnet.h>
  112 
  113 #include <netinet/in.h>
  114 #include <netinet/in_var.h>
  115 #include <netinet/icmp6.h>
  116 #include <netinet/ip_encap.h>
  117 
  118 #include <netinet/ip6.h>
  119 #include <netinet/in_kdtrace.h>
  120 #include <netinet6/ip6_var.h>
  121 #include <netinet6/scope6_var.h>
  122 #include <netinet6/nd6.h>
  123 #include <netinet6/ip6_mroute.h>
  124 #include <netinet6/pim6.h>
  125 #include <netinet6/pim6_var.h>
  126 
  127 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
  128 
  129 static int      ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
  130 static void     phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
  131 static int      register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
  132 static int      set_pim6(int *);
  133 static int      socket_send(struct socket *, struct mbuf *,
  134                     struct sockaddr_in6 *);
  135 
  136 extern int in6_mcast_loop;
  137 extern struct domain inet6domain;
  138 
  139 static const struct encaptab *pim6_encap_cookie;
  140 static const struct protosw 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 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
  151 
  152 static VNET_DEFINE(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, CTLFLAG_RW, 0, "PIM");
  158 
  159 static struct mrt6stat mrt6stat;
  160 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
  161     &mrt6stat, mrt6stat,
  162     "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
  163 
  164 #define MRT6STAT_INC(name)      mrt6stat.name += 1
  165 #define NO_RTE_FOUND    0x1
  166 #define RTE_FOUND       0x2
  167 
  168 static struct mtx mrouter6_mtx;
  169 #define MROUTER6_LOCK()         mtx_lock(&mrouter6_mtx)
  170 #define MROUTER6_UNLOCK()       mtx_unlock(&mrouter6_mtx)
  171 #define MROUTER6_LOCK_ASSERT()  do {                                    \
  172         mtx_assert(&mrouter6_mtx, MA_OWNED);                            \
  173         NET_ASSERT_GIANT();                                             \
  174 } while (0)
  175 #define MROUTER6_LOCK_INIT()    \
  176         mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
  177 #define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
  178 
  179 static struct mf6c *mf6ctable[MF6CTBLSIZ];
  180 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
  181     &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
  182     "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
  183     "netinet6/ip6_mroute.h)");
  184 
  185 static struct mtx mfc6_mtx;
  186 #define MFC6_LOCK()             mtx_lock(&mfc6_mtx)
  187 #define MFC6_UNLOCK()           mtx_unlock(&mfc6_mtx)
  188 #define MFC6_LOCK_ASSERT()      do {                                    \
  189         mtx_assert(&mfc6_mtx, MA_OWNED);                                \
  190         NET_ASSERT_GIANT();                                             \
  191 } while (0)
  192 #define MFC6_LOCK_INIT()                \
  193         mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
  194 #define MFC6_LOCK_DESTROY()     mtx_destroy(&mfc6_mtx)
  195 
  196 static u_char n6expire[MF6CTBLSIZ];
  197 
  198 static struct mif6 mif6table[MAXMIFS];
  199 static int
  200 sysctl_mif6table(SYSCTL_HANDLER_ARGS)
  201 {
  202         struct mif6_sctl *out;
  203         int error;
  204 
  205         out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
  206             M_WAITOK | M_ZERO);
  207         for (int i = 0; i < MAXMIFS; i++) {
  208                 out[i].m6_flags         = mif6table[i].m6_flags;
  209                 out[i].m6_rate_limit    = mif6table[i].m6_rate_limit;
  210                 out[i].m6_lcl_addr      = mif6table[i].m6_lcl_addr;
  211                 if (mif6table[i].m6_ifp != NULL)
  212                         out[i].m6_ifp   = mif6table[i].m6_ifp->if_index;
  213                 else
  214                         out[i].m6_ifp   = 0;
  215                 out[i].m6_pkt_in        = mif6table[i].m6_pkt_in;
  216                 out[i].m6_pkt_out       = mif6table[i].m6_pkt_out;
  217                 out[i].m6_bytes_in      = mif6table[i].m6_bytes_in;
  218                 out[i].m6_bytes_out     = mif6table[i].m6_bytes_out;
  219         }
  220         error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
  221         free(out, M_TEMP);
  222         return (error);
  223 }
  224 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, CTLTYPE_OPAQUE | CTLFLAG_RD,
  225     NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
  226     "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
  227     "netinet6/ip6_mroute.h)");
  228 
  229 static struct mtx mif6_mtx;
  230 #define MIF6_LOCK()             mtx_lock(&mif6_mtx)
  231 #define MIF6_UNLOCK()           mtx_unlock(&mif6_mtx)
  232 #define MIF6_LOCK_ASSERT()      mtx_assert(&mif6_mtx, MA_OWNED)
  233 #define MIF6_LOCK_INIT()        \
  234         mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
  235 #define MIF6_LOCK_DESTROY()     mtx_destroy(&mif6_mtx)
  236 
  237 #ifdef MRT6DEBUG
  238 static VNET_DEFINE(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 static VNET_DEFINE(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(&expire_upcalls_ch, 0);
  584         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
  585             expire_upcalls, NULL);
  586 
  587         MROUTER6_UNLOCK();
  588         MRT6_DLOG(DEBUG_ANY, "finished");
  589 
  590         return (0);
  591 }
  592 
  593 /*
  594  * Disable IPv6 multicast forwarding.
  595  */
  596 int
  597 X_ip6_mrouter_done(void)
  598 {
  599         mifi_t mifi;
  600         u_long i;
  601         struct mf6c *rt;
  602         struct rtdetq *rte;
  603 
  604         MROUTER6_LOCK();
  605 
  606         if (V_ip6_mrouter == NULL) {
  607                 MROUTER6_UNLOCK();
  608                 return (EINVAL);
  609         }
  610 
  611         /*
  612          * For each phyint in use, disable promiscuous reception of all IPv6
  613          * multicasts.
  614          */
  615         for (mifi = 0; mifi < nummifs; mifi++) {
  616                 if (mif6table[mifi].m6_ifp &&
  617                     !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
  618                         if_allmulti(mif6table[mifi].m6_ifp, 0);
  619                 }
  620         }
  621         bzero((caddr_t)mif6table, sizeof(mif6table));
  622         nummifs = 0;
  623 
  624         V_pim6 = 0; /* used to stub out/in pim specific code */
  625 
  626         callout_stop(&expire_upcalls_ch);
  627 
  628         /*
  629          * Free all multicast forwarding cache entries.
  630          */
  631         MFC6_LOCK();
  632         for (i = 0; i < MF6CTBLSIZ; i++) {
  633                 rt = mf6ctable[i];
  634                 while (rt) {
  635                         struct mf6c *frt;
  636 
  637                         for (rte = rt->mf6c_stall; rte != NULL; ) {
  638                                 struct rtdetq *n = rte->next;
  639 
  640                                 m_freem(rte->m);
  641                                 free(rte, M_MRTABLE6);
  642                                 rte = n;
  643                         }
  644                         frt = rt;
  645                         rt = rt->mf6c_next;
  646                         free(frt, M_MRTABLE6);
  647                 }
  648         }
  649         bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
  650         MFC6_UNLOCK();
  651 
  652         /*
  653          * Reset register interface
  654          */
  655         if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
  656                 if_detach(multicast_register_if6);
  657                 if_free(multicast_register_if6);
  658                 reg_mif_num = (mifi_t)-1;
  659                 multicast_register_if6 = NULL;
  660         }
  661 
  662         V_ip6_mrouter = NULL;
  663         V_ip6_mrouter_ver = 0;
  664 
  665         MROUTER6_UNLOCK();
  666         MRT6_DLOG(DEBUG_ANY, "finished");
  667 
  668         return (0);
  669 }
  670 
  671 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
  672 
  673 /*
  674  * Add a mif to the mif table
  675  */
  676 static int
  677 add_m6if(struct mif6ctl *mifcp)
  678 {
  679         struct mif6 *mifp;
  680         struct ifnet *ifp;
  681         int error;
  682 
  683         MIF6_LOCK();
  684 
  685         if (mifcp->mif6c_mifi >= MAXMIFS) {
  686                 MIF6_UNLOCK();
  687                 return (EINVAL);
  688         }
  689         mifp = mif6table + mifcp->mif6c_mifi;
  690         if (mifp->m6_ifp != NULL) {
  691                 MIF6_UNLOCK();
  692                 return (EADDRINUSE); /* XXX: is it appropriate? */
  693         }
  694         if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
  695                 MIF6_UNLOCK();
  696                 return (ENXIO);
  697         }
  698 
  699         ifp = ifnet_byindex(mifcp->mif6c_pifi);
  700 
  701         if (mifcp->mif6c_flags & MIFF_REGISTER) {
  702                 if (reg_mif_num == (mifi_t)-1) {
  703                         ifp = if_alloc(IFT_OTHER);
  704 
  705                         if_initname(ifp, "register_mif", 0);
  706                         ifp->if_flags |= IFF_LOOPBACK;
  707                         if_attach(ifp);
  708                         multicast_register_if6 = ifp;
  709                         reg_mif_num = mifcp->mif6c_mifi;
  710                         /*
  711                          * it is impossible to guess the ifindex of the
  712                          * register interface.  So mif6c_pifi is automatically
  713                          * calculated.
  714                          */
  715                         mifcp->mif6c_pifi = ifp->if_index;
  716                 } else {
  717                         ifp = multicast_register_if6;
  718                 }
  719         } else {
  720                 /* Make sure the interface supports multicast */
  721                 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
  722                         MIF6_UNLOCK();
  723                         return (EOPNOTSUPP);
  724                 }
  725 
  726                 error = if_allmulti(ifp, 1);
  727                 if (error) {
  728                         MIF6_UNLOCK();
  729                         return (error);
  730                 }
  731         }
  732 
  733         mifp->m6_flags     = mifcp->mif6c_flags;
  734         mifp->m6_ifp       = ifp;
  735 
  736         /* initialize per mif pkt counters */
  737         mifp->m6_pkt_in    = 0;
  738         mifp->m6_pkt_out   = 0;
  739         mifp->m6_bytes_in  = 0;
  740         mifp->m6_bytes_out = 0;
  741 
  742         /* Adjust nummifs up if the mifi is higher than nummifs */
  743         if (nummifs <= mifcp->mif6c_mifi)
  744                 nummifs = mifcp->mif6c_mifi + 1;
  745 
  746         MIF6_UNLOCK();
  747         MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
  748             if_name(ifp));
  749 
  750         return (0);
  751 }
  752 
  753 /*
  754  * Delete a mif from the mif table
  755  */
  756 static int
  757 del_m6if_locked(mifi_t *mifip)
  758 {
  759         struct mif6 *mifp = mif6table + *mifip;
  760         mifi_t mifi;
  761         struct ifnet *ifp;
  762 
  763         MIF6_LOCK_ASSERT();
  764 
  765         if (*mifip >= nummifs)
  766                 return (EINVAL);
  767         if (mifp->m6_ifp == NULL)
  768                 return (EINVAL);
  769 
  770         if (!(mifp->m6_flags & MIFF_REGISTER)) {
  771                 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
  772                 ifp = mifp->m6_ifp;
  773                 if_allmulti(ifp, 0);
  774         } else {
  775                 if (reg_mif_num != (mifi_t)-1 &&
  776                     multicast_register_if6 != NULL) {
  777                         if_detach(multicast_register_if6);
  778                         if_free(multicast_register_if6);
  779                         reg_mif_num = (mifi_t)-1;
  780                         multicast_register_if6 = NULL;
  781                 }
  782         }
  783 
  784         bzero((caddr_t)mifp, sizeof(*mifp));
  785 
  786         /* Adjust nummifs down */
  787         for (mifi = nummifs; mifi > 0; mifi--)
  788                 if (mif6table[mifi - 1].m6_ifp)
  789                         break;
  790         nummifs = mifi;
  791         MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
  792 
  793         return (0);
  794 }
  795 
  796 static int
  797 del_m6if(mifi_t *mifip)
  798 {
  799         int cc;
  800 
  801         MIF6_LOCK();
  802         cc = del_m6if_locked(mifip);
  803         MIF6_UNLOCK();
  804 
  805         return (cc);
  806 }
  807 
  808 /*
  809  * Add an mfc entry
  810  */
  811 static int
  812 add_m6fc(struct mf6cctl *mfccp)
  813 {
  814         struct mf6c *rt;
  815         u_long hash;
  816         struct rtdetq *rte;
  817         u_short nstl;
  818         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  819 
  820         MFC6_LOCK();
  821 
  822         MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
  823                  mfccp->mf6cc_mcastgrp.sin6_addr, rt);
  824 
  825         /* If an entry already exists, just update the fields */
  826         if (rt) {
  827                 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
  828                     ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
  829                     ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
  830                     mfccp->mf6cc_parent);
  831 
  832                 rt->mf6c_parent = mfccp->mf6cc_parent;
  833                 rt->mf6c_ifset = mfccp->mf6cc_ifset;
  834 
  835                 MFC6_UNLOCK();
  836                 return (0);
  837         }
  838 
  839         /*
  840          * Find the entry for which the upcall was made and update
  841          */
  842         hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
  843                         mfccp->mf6cc_mcastgrp.sin6_addr);
  844         for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
  845                 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  846                                        &mfccp->mf6cc_origin.sin6_addr) &&
  847                     IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  848                                        &mfccp->mf6cc_mcastgrp.sin6_addr) &&
  849                     (rt->mf6c_stall != NULL)) {
  850 
  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 
  906                         if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
  907                                                &mfccp->mf6cc_origin.sin6_addr)&&
  908                             IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
  909                                                &mfccp->mf6cc_mcastgrp.sin6_addr)) {
  910 
  911                                 rt->mf6c_origin     = mfccp->mf6cc_origin;
  912                                 rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  913                                 rt->mf6c_parent     = mfccp->mf6cc_parent;
  914                                 rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  915                                 /* initialize pkt counters per src-grp */
  916                                 rt->mf6c_pkt_cnt    = 0;
  917                                 rt->mf6c_byte_cnt   = 0;
  918                                 rt->mf6c_wrong_if   = 0;
  919 
  920                                 if (rt->mf6c_expire)
  921                                         n6expire[hash]--;
  922                                 rt->mf6c_expire    = 0;
  923                         }
  924                 }
  925                 if (rt == NULL) {
  926                         /* no upcall, so make a new entry */
  927                         rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
  928                                                   M_NOWAIT);
  929                         if (rt == NULL) {
  930                                 MFC6_UNLOCK();
  931                                 return (ENOBUFS);
  932                         }
  933 
  934                         /* insert new entry at head of hash chain */
  935                         rt->mf6c_origin     = mfccp->mf6cc_origin;
  936                         rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
  937                         rt->mf6c_parent     = mfccp->mf6cc_parent;
  938                         rt->mf6c_ifset      = mfccp->mf6cc_ifset;
  939                         /* initialize pkt counters per src-grp */
  940                         rt->mf6c_pkt_cnt    = 0;
  941                         rt->mf6c_byte_cnt   = 0;
  942                         rt->mf6c_wrong_if   = 0;
  943                         rt->mf6c_expire     = 0;
  944                         rt->mf6c_stall = NULL;
  945 
  946                         /* link into table */
  947                         rt->mf6c_next  = mf6ctable[hash];
  948                         mf6ctable[hash] = rt;
  949                 }
  950         }
  951 
  952         MFC6_UNLOCK();
  953         return (0);
  954 }
  955 
  956 #ifdef UPCALL_TIMING
  957 /*
  958  * collect delay statistics on the upcalls
  959  */
  960 static void
  961 collate(struct timeval *t)
  962 {
  963         u_long d;
  964         struct timeval tp;
  965         u_long delta;
  966 
  967         GET_TIME(tp);
  968 
  969         if (TV_LT(*t, tp))
  970         {
  971                 TV_DELTA(tp, *t, delta);
  972 
  973                 d = delta >> 10;
  974                 if (d > UPCALL_MAX)
  975                         d = UPCALL_MAX;
  976 
  977                 ++upcall_data[d];
  978         }
  979 }
  980 #endif /* UPCALL_TIMING */
  981 
  982 /*
  983  * Delete an mfc entry
  984  */
  985 static int
  986 del_m6fc(struct mf6cctl *mfccp)
  987 {
  988 #ifdef MRT6DEBUG
  989         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
  990 #endif
  991         struct sockaddr_in6     origin;
  992         struct sockaddr_in6     mcastgrp;
  993         struct mf6c             *rt;
  994         struct mf6c             **nptr;
  995         u_long          hash;
  996 
  997         origin = mfccp->mf6cc_origin;
  998         mcastgrp = mfccp->mf6cc_mcastgrp;
  999         hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
 1000 
 1001         MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
 1002             ip6_sprintf(ip6bufo, &origin.sin6_addr),
 1003             ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
 1004 
 1005         MFC6_LOCK();
 1006 
 1007         nptr = &mf6ctable[hash];
 1008         while ((rt = *nptr) != NULL) {
 1009                 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
 1010                                        &rt->mf6c_origin.sin6_addr) &&
 1011                     IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
 1012                                        &rt->mf6c_mcastgrp.sin6_addr) &&
 1013                     rt->mf6c_stall == NULL)
 1014                         break;
 1015 
 1016                 nptr = &rt->mf6c_next;
 1017         }
 1018         if (rt == NULL) {
 1019                 MFC6_UNLOCK();
 1020                 return (EADDRNOTAVAIL);
 1021         }
 1022 
 1023         *nptr = rt->mf6c_next;
 1024         free(rt, M_MRTABLE6);
 1025 
 1026         MFC6_UNLOCK();
 1027 
 1028         return (0);
 1029 }
 1030 
 1031 static int
 1032 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
 1033 {
 1034 
 1035         if (s) {
 1036                 if (sbappendaddr(&s->so_rcv,
 1037                                  (struct sockaddr *)src,
 1038                                  mm, (struct mbuf *)0) != 0) {
 1039                         sorwakeup(s);
 1040                         return (0);
 1041                 }
 1042         }
 1043         m_freem(mm);
 1044         return (-1);
 1045 }
 1046 
 1047 /*
 1048  * IPv6 multicast forwarding function. This function assumes that the packet
 1049  * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
 1050  * pointed to by "ifp", and the packet is to be relayed to other networks
 1051  * that have members of the packet's destination IPv6 multicast group.
 1052  *
 1053  * The packet is returned unscathed to the caller, unless it is
 1054  * erroneous, in which case a non-zero return value tells the caller to
 1055  * discard it.
 1056  *
 1057  * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
 1058  * this function is called in the originating context (i.e., not when
 1059  * forwarding a packet from other node).  ip6_output(), which is currently the
 1060  * only function that calls this function is called in the originating context,
 1061  * explicitly ensures this condition.  It is caller's responsibility to ensure
 1062  * that if this function is called from somewhere else in the originating
 1063  * context in the future.
 1064  */
 1065 int
 1066 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
 1067 {
 1068         struct rtdetq *rte;
 1069         struct mbuf *mb0;
 1070         struct mf6c *rt;
 1071         struct mif6 *mifp;
 1072         struct mbuf *mm;
 1073         u_long hash;
 1074         mifi_t mifi;
 1075         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1076 #ifdef UPCALL_TIMING
 1077         struct timeval tp;
 1078 
 1079         GET_TIME(tp);
 1080 #endif /* UPCALL_TIMING */
 1081 
 1082         MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
 1083             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1084             ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
 1085 
 1086         /*
 1087          * Don't forward a packet with Hop limit of zero or one,
 1088          * or a packet destined to a local-only group.
 1089          */
 1090         if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
 1091             IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
 1092                 return (0);
 1093         ip6->ip6_hlim--;
 1094 
 1095         /*
 1096          * Source address check: do not forward packets with unspecified
 1097          * source. It was discussed in July 2000, on ipngwg mailing list.
 1098          * This is rather more serious than unicast cases, because some
 1099          * MLD packets can be sent with the unspecified source address
 1100          * (although such packets must normally set 1 to the hop limit field).
 1101          */
 1102         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
 1103                 IP6STAT_INC(ip6s_cantforward);
 1104                 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
 1105                         V_ip6_log_time = time_uptime;
 1106                         log(LOG_DEBUG,
 1107                             "cannot forward "
 1108                             "from %s to %s nxt %d received on %s\n",
 1109                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1110                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1111                             ip6->ip6_nxt,
 1112                             if_name(m->m_pkthdr.rcvif));
 1113                 }
 1114                 return (0);
 1115         }
 1116 
 1117         MFC6_LOCK();
 1118 
 1119         /*
 1120          * Determine forwarding mifs from the forwarding cache table
 1121          */
 1122         MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
 1123         MRT6STAT_INC(mrt6s_mfc_lookups);
 1124 
 1125         /* Entry exists, so forward if necessary */
 1126         if (rt) {
 1127                 MFC6_UNLOCK();
 1128                 return (ip6_mdq(m, ifp, rt));
 1129         }
 1130 
 1131         /*
 1132          * If we don't have a route for packet's origin,
 1133          * Make a copy of the packet & send message to routing daemon.
 1134          */
 1135         MRT6STAT_INC(mrt6s_no_route);
 1136         MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
 1137             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1138             ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1139 
 1140         /*
 1141          * Allocate mbufs early so that we don't do extra work if we
 1142          * are just going to fail anyway.
 1143          */
 1144         rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
 1145         if (rte == NULL) {
 1146                 MFC6_UNLOCK();
 1147                 return (ENOBUFS);
 1148         }
 1149         mb0 = m_copy(m, 0, M_COPYALL);
 1150         /*
 1151          * Pullup packet header if needed before storing it,
 1152          * as other references may modify it in the meantime.
 1153          */
 1154         if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
 1155                 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
 1156         if (mb0 == NULL) {
 1157                 free(rte, M_MRTABLE6);
 1158                 MFC6_UNLOCK();
 1159                 return (ENOBUFS);
 1160         }
 1161 
 1162         /* is there an upcall waiting for this packet? */
 1163         hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
 1164         for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
 1165                 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
 1166                     &rt->mf6c_origin.sin6_addr) &&
 1167                     IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
 1168                     &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
 1169                         break;
 1170         }
 1171 
 1172         if (rt == NULL) {
 1173                 struct mrt6msg *im;
 1174 #ifdef MRT6_OINIT
 1175                 struct omrt6msg *oim;
 1176 #endif
 1177                 /* no upcall, so make a new entry */
 1178                 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
 1179                 if (rt == NULL) {
 1180                         free(rte, M_MRTABLE6);
 1181                         m_freem(mb0);
 1182                         MFC6_UNLOCK();
 1183                         return (ENOBUFS);
 1184                 }
 1185                 /*
 1186                  * Make a copy of the header to send to the user
 1187                  * level process
 1188                  */
 1189                 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
 1190                 if (mm == NULL) {
 1191                         free(rte, M_MRTABLE6);
 1192                         m_freem(mb0);
 1193                         free(rt, M_MRTABLE6);
 1194                         MFC6_UNLOCK();
 1195                         return (ENOBUFS);
 1196                 }
 1197 
 1198                 /*
 1199                  * Send message to routing daemon
 1200                  */
 1201                 sin6.sin6_addr = ip6->ip6_src;
 1202                 im = NULL;
 1203 #ifdef MRT6_OINIT
 1204                 oim = NULL;
 1205 #endif
 1206                 switch (V_ip6_mrouter_ver) {
 1207 #ifdef MRT6_OINIT
 1208                 case MRT6_OINIT:
 1209                         oim = mtod(mm, struct omrt6msg *);
 1210                         oim->im6_msgtype = MRT6MSG_NOCACHE;
 1211                         oim->im6_mbz = 0;
 1212                         break;
 1213 #endif
 1214                 case MRT6_INIT:
 1215                         im = mtod(mm, struct mrt6msg *);
 1216                         im->im6_msgtype = MRT6MSG_NOCACHE;
 1217                         im->im6_mbz = 0;
 1218                         break;
 1219                 default:
 1220                         free(rte, M_MRTABLE6);
 1221                         m_freem(mb0);
 1222                         free(rt, M_MRTABLE6);
 1223                         MFC6_UNLOCK();
 1224                         return (EINVAL);
 1225                 }
 1226 
 1227                 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
 1228                 for (mifp = mif6table, mifi = 0;
 1229                     mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
 1230                                 ;
 1231 
 1232                 switch (V_ip6_mrouter_ver) {
 1233 #ifdef MRT6_OINIT
 1234                 case MRT6_OINIT:
 1235                         oim->im6_mif = mifi;
 1236                         break;
 1237 #endif
 1238                 case MRT6_INIT:
 1239                         im->im6_mif = mifi;
 1240                         break;
 1241                 }
 1242 
 1243                 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1244                         log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
 1245                             "socket queue full\n");
 1246                         MRT6STAT_INC(mrt6s_upq_sockfull);
 1247                         free(rte, M_MRTABLE6);
 1248                         m_freem(mb0);
 1249                         free(rt, M_MRTABLE6);
 1250                         MFC6_UNLOCK();
 1251                         return (ENOBUFS);
 1252                 }
 1253 
 1254                 MRT6STAT_INC(mrt6s_upcalls);
 1255 
 1256                 /* insert new entry at head of hash chain */
 1257                 bzero(rt, sizeof(*rt));
 1258                 rt->mf6c_origin.sin6_family = AF_INET6;
 1259                 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
 1260                 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
 1261                 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
 1262                 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
 1263                 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
 1264                 rt->mf6c_expire = UPCALL_EXPIRE;
 1265                 n6expire[hash]++;
 1266                 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
 1267 
 1268                 /* link into table */
 1269                 rt->mf6c_next  = mf6ctable[hash];
 1270                 mf6ctable[hash] = rt;
 1271                 /* Add this entry to the end of the queue */
 1272                 rt->mf6c_stall = rte;
 1273         } else {
 1274                 /* determine if q has overflowed */
 1275                 struct rtdetq **p;
 1276                 int npkts = 0;
 1277 
 1278                 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
 1279                         if (++npkts > MAX_UPQ6) {
 1280                                 MRT6STAT_INC(mrt6s_upq_ovflw);
 1281                                 free(rte, M_MRTABLE6);
 1282                                 m_freem(mb0);
 1283                                 MFC6_UNLOCK();
 1284                                 return (0);
 1285                         }
 1286 
 1287                 /* Add this entry to the end of the queue */
 1288                 *p = rte;
 1289         }
 1290 
 1291         rte->next = NULL;
 1292         rte->m = mb0;
 1293         rte->ifp = ifp;
 1294 #ifdef UPCALL_TIMING
 1295         rte->t = tp;
 1296 #endif /* UPCALL_TIMING */
 1297 
 1298         MFC6_UNLOCK();
 1299 
 1300         return (0);
 1301 }
 1302 
 1303 /*
 1304  * Clean up cache entries if upcalls are not serviced
 1305  * Call from the Slow Timeout mechanism, every half second.
 1306  */
 1307 static void
 1308 expire_upcalls(void *unused)
 1309 {
 1310 #ifdef MRT6DEBUG
 1311         char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
 1312 #endif
 1313         struct rtdetq *rte;
 1314         struct mf6c *mfc, **nptr;
 1315         u_long i;
 1316 
 1317         MFC6_LOCK();
 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         MFC6_UNLOCK();
 1356         callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
 1357             expire_upcalls, NULL);
 1358 }
 1359 
 1360 /*
 1361  * Packet forwarding routine once entry in the cache is made
 1362  */
 1363 static int
 1364 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
 1365 {
 1366         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1367         mifi_t mifi, iif;
 1368         struct mif6 *mifp;
 1369         int plen = m->m_pkthdr.len;
 1370         struct in6_addr src0, dst0; /* copies for local work */
 1371         u_int32_t iszone, idzone, oszone, odzone;
 1372         int error = 0;
 1373 
 1374 /*
 1375  * Macro to send packet on mif.  Since RSVP packets don't get counted on
 1376  * input, they shouldn't get counted on output, so statistics keeping is
 1377  * separate.
 1378  */
 1379 
 1380 #define MC6_SEND(ip6, mifp, m) do {                             \
 1381         if ((mifp)->m6_flags & MIFF_REGISTER)                   \
 1382                 register_send((ip6), (mifp), (m));              \
 1383         else                                                    \
 1384                 phyint_send((ip6), (mifp), (m));                \
 1385 } while (/*CONSTCOND*/ 0)
 1386 
 1387         /*
 1388          * Don't forward if it didn't arrive from the parent mif
 1389          * for its origin.
 1390          */
 1391         mifi = rt->mf6c_parent;
 1392         if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
 1393                 /* came in the wrong interface */
 1394                 MRT6_DLOG(DEBUG_FORWARD,
 1395                     "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
 1396                     mifi, mif6table[mifi].m6_ifp->if_index);
 1397                 MRT6STAT_INC(mrt6s_wrong_if);
 1398                 rt->mf6c_wrong_if++;
 1399                 /*
 1400                  * If we are doing PIM processing, and we are forwarding
 1401                  * packets on this interface, send a message to the
 1402                  * routing daemon.
 1403                  */
 1404                 /* have to make sure this is a valid mif */
 1405                 if (mifi < nummifs && mif6table[mifi].m6_ifp)
 1406                         if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
 1407                                 /*
 1408                                  * Check the M_LOOP flag to avoid an
 1409                                  * unnecessary PIM assert.
 1410                                  * XXX: M_LOOP is an ad-hoc hack...
 1411                                  */
 1412                                 static struct sockaddr_in6 sin6 =
 1413                                 { sizeof(sin6), AF_INET6 };
 1414 
 1415                                 struct mbuf *mm;
 1416                                 struct mrt6msg *im;
 1417 #ifdef MRT6_OINIT
 1418                                 struct omrt6msg *oim;
 1419 #endif
 1420 
 1421                                 mm = m_copy(m, 0, sizeof(struct ip6_hdr));
 1422                                 if (mm &&
 1423                                     (!M_WRITABLE(mm) ||
 1424                                      mm->m_len < sizeof(struct ip6_hdr)))
 1425                                         mm = m_pullup(mm, sizeof(struct ip6_hdr));
 1426                                 if (mm == NULL)
 1427                                         return (ENOBUFS);
 1428 
 1429 #ifdef MRT6_OINIT
 1430                                 oim = NULL;
 1431 #endif
 1432                                 im = NULL;
 1433                                 switch (V_ip6_mrouter_ver) {
 1434 #ifdef MRT6_OINIT
 1435                                 case MRT6_OINIT:
 1436                                         oim = mtod(mm, struct omrt6msg *);
 1437                                         oim->im6_msgtype = MRT6MSG_WRONGMIF;
 1438                                         oim->im6_mbz = 0;
 1439                                         break;
 1440 #endif
 1441                                 case MRT6_INIT:
 1442                                         im = mtod(mm, struct mrt6msg *);
 1443                                         im->im6_msgtype = MRT6MSG_WRONGMIF;
 1444                                         im->im6_mbz = 0;
 1445                                         break;
 1446                                 default:
 1447                                         m_freem(mm);
 1448                                         return (EINVAL);
 1449                                 }
 1450 
 1451                                 for (mifp = mif6table, iif = 0;
 1452                                      iif < nummifs && mifp &&
 1453                                              mifp->m6_ifp != ifp;
 1454                                      mifp++, iif++)
 1455                                         ;
 1456 
 1457                                 switch (V_ip6_mrouter_ver) {
 1458 #ifdef MRT6_OINIT
 1459                                 case MRT6_OINIT:
 1460                                         oim->im6_mif = iif;
 1461                                         sin6.sin6_addr = oim->im6_src;
 1462                                         break;
 1463 #endif
 1464                                 case MRT6_INIT:
 1465                                         im->im6_mif = iif;
 1466                                         sin6.sin6_addr = im->im6_src;
 1467                                         break;
 1468                                 }
 1469 
 1470                                 MRT6STAT_INC(mrt6s_upcalls);
 1471 
 1472                                 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1473                                         MRT6_DLOG(DEBUG_ANY,
 1474                                             "ip6_mrouter socket queue full");
 1475                                         MRT6STAT_INC(mrt6s_upq_sockfull);
 1476                                         return (ENOBUFS);
 1477                                 }       /* if socket Q full */
 1478                         }               /* if PIM */
 1479                 return (0);
 1480         }                       /* if wrong iif */
 1481 
 1482         /* If I sourced this packet, it counts as output, else it was input. */
 1483         if (m->m_pkthdr.rcvif == NULL) {
 1484                 /* XXX: is rcvif really NULL when output?? */
 1485                 mif6table[mifi].m6_pkt_out++;
 1486                 mif6table[mifi].m6_bytes_out += plen;
 1487         } else {
 1488                 mif6table[mifi].m6_pkt_in++;
 1489                 mif6table[mifi].m6_bytes_in += plen;
 1490         }
 1491         rt->mf6c_pkt_cnt++;
 1492         rt->mf6c_byte_cnt += plen;
 1493 
 1494         /*
 1495          * For each mif, forward a copy of the packet if there are group
 1496          * members downstream on the interface.
 1497          */
 1498         src0 = ip6->ip6_src;
 1499         dst0 = ip6->ip6_dst;
 1500         if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
 1501             (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
 1502                 IP6STAT_INC(ip6s_badscope);
 1503                 return (error);
 1504         }
 1505         for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
 1506                 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
 1507                         /*
 1508                          * check if the outgoing packet is going to break
 1509                          * a scope boundary.
 1510                          * XXX For packets through PIM register tunnel
 1511                          * interface, we believe a routing daemon.
 1512                          */
 1513                         if (!(mif6table[rt->mf6c_parent].m6_flags &
 1514                               MIFF_REGISTER) &&
 1515                             !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
 1516                                 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
 1517                                     &oszone) ||
 1518                                     in6_setscope(&dst0, mif6table[mifi].m6_ifp,
 1519                                     &odzone) ||
 1520                                     iszone != oszone ||
 1521                                     idzone != odzone) {
 1522                                         IP6STAT_INC(ip6s_badscope);
 1523                                         continue;
 1524                                 }
 1525                         }
 1526 
 1527                         mifp->m6_pkt_out++;
 1528                         mifp->m6_bytes_out += plen;
 1529                         MC6_SEND(ip6, mifp, m);
 1530                 }
 1531         }
 1532         return (0);
 1533 }
 1534 
 1535 static void
 1536 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
 1537 {
 1538 #ifdef MRT6DEBUG
 1539         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1540 #endif
 1541         struct mbuf *mb_copy;
 1542         struct ifnet *ifp = mifp->m6_ifp;
 1543         int error = 0;
 1544         u_long linkmtu;
 1545 
 1546         /*
 1547          * Make a new reference to the packet; make sure that
 1548          * the IPv6 header is actually copied, not just referenced,
 1549          * so that ip6_output() only scribbles on the copy.
 1550          */
 1551         mb_copy = m_copy(m, 0, M_COPYALL);
 1552         if (mb_copy &&
 1553             (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
 1554                 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
 1555         if (mb_copy == NULL) {
 1556                 return;
 1557         }
 1558         /* set MCAST flag to the outgoing packet */
 1559         mb_copy->m_flags |= M_MCAST;
 1560 
 1561         /*
 1562          * If we sourced the packet, call ip6_output since we may devide
 1563          * the packet into fragments when the packet is too big for the
 1564          * outgoing interface.
 1565          * Otherwise, we can simply send the packet to the interface
 1566          * sending queue.
 1567          */
 1568         if (m->m_pkthdr.rcvif == NULL) {
 1569                 struct ip6_moptions im6o;
 1570 
 1571                 im6o.im6o_multicast_ifp = ifp;
 1572                 /* XXX: ip6_output will override ip6->ip6_hlim */
 1573                 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
 1574                 im6o.im6o_multicast_loop = 1;
 1575                 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
 1576                     NULL, NULL);
 1577 
 1578                 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
 1579                     (uint16_t)(mifp - mif6table), error);
 1580                 return;
 1581         }
 1582 
 1583         /*
 1584          * If configured to loop back multicasts by default,
 1585          * loop back a copy now.
 1586          */
 1587         if (in6_mcast_loop)
 1588                 ip6_mloopback(ifp, m);
 1589 
 1590         /*
 1591          * Put the packet into the sending queue of the outgoing interface
 1592          * if it would fit in the MTU of the interface.
 1593          */
 1594         linkmtu = IN6_LINKMTU(ifp);
 1595         if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
 1596                 struct sockaddr_in6 dst6;
 1597 
 1598                 bzero(&dst6, sizeof(dst6));
 1599                 dst6.sin6_len = sizeof(struct sockaddr_in6);
 1600                 dst6.sin6_family = AF_INET6;
 1601                 dst6.sin6_addr = ip6->ip6_dst;
 1602 
 1603                 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
 1604                 /*
 1605                  * We just call if_output instead of nd6_output here, since
 1606                  * we need no ND for a multicast forwarded packet...right?
 1607                  */
 1608                 m_clrprotoflags(m);     /* Avoid confusing lower layers. */
 1609                 error = (*ifp->if_output)(ifp, mb_copy,
 1610                     (struct sockaddr *)&dst6, NULL);
 1611                 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
 1612                     (uint16_t)(mifp - mif6table), error);
 1613         } else {
 1614                 /*
 1615                  * pMTU discovery is intentionally disabled by default, since
 1616                  * various router may notify pMTU in multicast, which can be
 1617                  * a DDoS to a router
 1618                  */
 1619                 if (V_ip6_mcast_pmtu)
 1620                         icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
 1621                 else {
 1622                         MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
 1623                             "g %s size %d (discarded)", if_name(ifp),
 1624                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1625                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
 1626                             mb_copy->m_pkthdr.len);
 1627                         m_freem(mb_copy); /* simply discard the packet */
 1628                 }
 1629         }
 1630 }
 1631 
 1632 static int
 1633 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
 1634 {
 1635 #ifdef MRT6DEBUG
 1636         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1637 #endif
 1638         struct mbuf *mm;
 1639         int i, len = m->m_pkthdr.len;
 1640         static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
 1641         struct mrt6msg *im6;
 1642 
 1643         MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
 1644             ip6_sprintf(ip6bufs, &ip6->ip6_src),
 1645             ip6_sprintf(ip6bufd, &ip6->ip6_dst));
 1646         PIM6STAT_INC(pim6s_snd_registers);
 1647 
 1648         /* Make a copy of the packet to send to the user level process. */
 1649         mm = m_gethdr(M_NOWAIT, MT_DATA);
 1650         if (mm == NULL)
 1651                 return (ENOBUFS);
 1652         mm->m_data += max_linkhdr;
 1653         mm->m_len = sizeof(struct ip6_hdr);
 1654 
 1655         if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
 1656                 m_freem(mm);
 1657                 return (ENOBUFS);
 1658         }
 1659         i = MHLEN - M_LEADINGSPACE(mm);
 1660         if (i > len)
 1661                 i = len;
 1662         mm = m_pullup(mm, i);
 1663         if (mm == NULL)
 1664                 return (ENOBUFS);
 1665 /* TODO: check it! */
 1666         mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
 1667 
 1668         /*
 1669          * Send message to routing daemon
 1670          */
 1671         sin6.sin6_addr = ip6->ip6_src;
 1672 
 1673         im6 = mtod(mm, struct mrt6msg *);
 1674         im6->im6_msgtype      = MRT6MSG_WHOLEPKT;
 1675         im6->im6_mbz          = 0;
 1676 
 1677         im6->im6_mif = mif - mif6table;
 1678 
 1679         /* iif info is not given for reg. encap.n */
 1680         MRT6STAT_INC(mrt6s_upcalls);
 1681 
 1682         if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
 1683                 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
 1684                 MRT6STAT_INC(mrt6s_upq_sockfull);
 1685                 return (ENOBUFS);
 1686         }
 1687         return (0);
 1688 }
 1689 
 1690 /*
 1691  * pim6_encapcheck() is called by the encap6_input() path at runtime to
 1692  * determine if a packet is for PIM; allowing PIM to be dynamically loaded
 1693  * into the kernel.
 1694  */
 1695 static int
 1696 pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
 1697 {
 1698 
 1699 #ifdef DIAGNOSTIC
 1700     KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
 1701 #endif
 1702     if (proto != IPPROTO_PIM)
 1703         return 0;       /* not for us; reject the datagram. */
 1704 
 1705     return 64;          /* claim the datagram. */
 1706 }
 1707 
 1708 /*
 1709  * PIM sparse mode hook
 1710  * Receives the pim control messages, and passes them up to the listening
 1711  * socket, using rip6_input.
 1712  * The only message processed is the REGISTER pim message; the pim header
 1713  * is stripped off, and the inner packet is passed to register_mforward.
 1714  */
 1715 int
 1716 pim6_input(struct mbuf **mp, int *offp, int proto)
 1717 {
 1718         struct pim *pim; /* pointer to a pim struct */
 1719         struct ip6_hdr *ip6;
 1720         int pimlen;
 1721         struct mbuf *m = *mp;
 1722         int minlen;
 1723         int off = *offp;
 1724 
 1725         PIM6STAT_INC(pim6s_rcv_total);
 1726 
 1727         ip6 = mtod(m, struct ip6_hdr *);
 1728         pimlen = m->m_pkthdr.len - *offp;
 1729 
 1730         /*
 1731          * Validate lengths
 1732          */
 1733         if (pimlen < PIM_MINLEN) {
 1734                 PIM6STAT_INC(pim6s_rcv_tooshort);
 1735                 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
 1736                 m_freem(m);
 1737                 return (IPPROTO_DONE);
 1738         }
 1739 
 1740         /*
 1741          * if the packet is at least as big as a REGISTER, go ahead
 1742          * and grab the PIM REGISTER header size, to avoid another
 1743          * possible m_pullup() later.
 1744          *
 1745          * PIM_MINLEN       == pimhdr + u_int32 == 8
 1746          * PIM6_REG_MINLEN   == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
 1747          */
 1748         minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
 1749 
 1750         /*
 1751          * Make sure that the IP6 and PIM headers in contiguous memory, and
 1752          * possibly the PIM REGISTER header
 1753          */
 1754 #ifndef PULLDOWN_TEST
 1755         IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
 1756         /* adjust pointer */
 1757         ip6 = mtod(m, struct ip6_hdr *);
 1758 
 1759         /* adjust mbuf to point to the PIM header */
 1760         pim = (struct pim *)((caddr_t)ip6 + off);
 1761 #else
 1762         IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
 1763         if (pim == NULL) {
 1764                 PIM6STAT_INC(pim6s_rcv_tooshort);
 1765                 return (IPPROTO_DONE);
 1766         }
 1767 #endif
 1768 
 1769 #define PIM6_CHECKSUM
 1770 #ifdef PIM6_CHECKSUM
 1771         {
 1772                 int cksumlen;
 1773 
 1774                 /*
 1775                  * Validate checksum.
 1776                  * If PIM REGISTER, exclude the data packet
 1777                  */
 1778                 if (pim->pim_type == PIM_REGISTER)
 1779                         cksumlen = PIM_MINLEN;
 1780                 else
 1781                         cksumlen = pimlen;
 1782 
 1783                 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
 1784                         PIM6STAT_INC(pim6s_rcv_badsum);
 1785                         MRT6_DLOG(DEBUG_PIM, "invalid checksum");
 1786                         m_freem(m);
 1787                         return (IPPROTO_DONE);
 1788                 }
 1789         }
 1790 #endif /* PIM_CHECKSUM */
 1791 
 1792         /* PIM version check */
 1793         if (pim->pim_ver != PIM_VERSION) {
 1794                 PIM6STAT_INC(pim6s_rcv_badversion);
 1795                 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
 1796                     "incorrect version %d, expecting %d",
 1797                     pim->pim_ver, PIM_VERSION);
 1798                 m_freem(m);
 1799                 return (IPPROTO_DONE);
 1800         }
 1801 
 1802         if (pim->pim_type == PIM_REGISTER) {
 1803                 /*
 1804                  * since this is a REGISTER, we'll make a copy of the register
 1805                  * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
 1806                  * routing daemon.
 1807                  */
 1808                 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
 1809 
 1810                 struct mbuf *mcp;
 1811                 struct ip6_hdr *eip6;
 1812                 u_int32_t *reghdr;
 1813                 int rc;
 1814 #ifdef MRT6DEBUG
 1815                 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
 1816 #endif
 1817 
 1818                 PIM6STAT_INC(pim6s_rcv_registers);
 1819 
 1820                 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
 1821                         MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
 1822                             reg_mif_num);
 1823                         m_freem(m);
 1824                         return (IPPROTO_DONE);
 1825                 }
 1826 
 1827                 reghdr = (u_int32_t *)(pim + 1);
 1828 
 1829                 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
 1830                         goto pim6_input_to_daemon;
 1831 
 1832                 /*
 1833                  * Validate length
 1834                  */
 1835                 if (pimlen < PIM6_REG_MINLEN) {
 1836                         PIM6STAT_INC(pim6s_rcv_tooshort);
 1837                         PIM6STAT_INC(pim6s_rcv_badregisters);
 1838                         MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
 1839                             "size too small %d from %s",
 1840                             pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
 1841                         m_freem(m);
 1842                         return (IPPROTO_DONE);
 1843                 }
 1844 
 1845                 eip6 = (struct ip6_hdr *) (reghdr + 1);
 1846                 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
 1847                     ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1848                     ip6_sprintf(ip6bufd, &eip6->ip6_dst),
 1849                     ntohs(eip6->ip6_plen));
 1850 
 1851                 /* verify the version number of the inner packet */
 1852                 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
 1853                         PIM6STAT_INC(pim6s_rcv_badregisters);
 1854                         MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
 1855                             "of the inner packet",
 1856                             (eip6->ip6_vfc & IPV6_VERSION));
 1857                         m_freem(m);
 1858                         return (IPPROTO_DONE);
 1859                 }
 1860 
 1861                 /* verify the inner packet is destined to a mcast group */
 1862                 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
 1863                         PIM6STAT_INC(pim6s_rcv_badregisters);
 1864                         MRT6_DLOG(DEBUG_PIM, "inner packet of register "
 1865                             "is not multicast %s",
 1866                             ip6_sprintf(ip6bufd, &eip6->ip6_dst));
 1867                         m_freem(m);
 1868                         return (IPPROTO_DONE);
 1869                 }
 1870 
 1871                 /*
 1872                  * make a copy of the whole header to pass to the daemon later.
 1873                  */
 1874                 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
 1875                 if (mcp == NULL) {
 1876                         MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
 1877                             "could not copy register head");
 1878                         m_freem(m);
 1879                         return (IPPROTO_DONE);
 1880                 }
 1881 
 1882                 /*
 1883                  * forward the inner ip6 packet; point m_data at the inner ip6.
 1884                  */
 1885                 m_adj(m, off + PIM_MINLEN);
 1886                 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
 1887                     "src %s, dst %s, mif %d",
 1888                     ip6_sprintf(ip6bufs, &eip6->ip6_src),
 1889                     ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
 1890 
 1891                 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
 1892                                 dst.sin6_family, 0);
 1893 
 1894                 /* prepare the register head to send to the mrouting daemon */
 1895                 m = mcp;
 1896         }
 1897 
 1898         /*
 1899          * Pass the PIM message up to the daemon; if it is a register message
 1900          * pass the 'head' only up to the daemon. This includes the
 1901          * encapsulator ip6 header, pim header, register header and the
 1902          * encapsulated ip6 header.
 1903          */
 1904   pim6_input_to_daemon:
 1905         rip6_input(&m, offp, proto);
 1906         return (IPPROTO_DONE);
 1907 }
 1908 
 1909 static int
 1910 ip6_mroute_modevent(module_t mod, int type, void *unused)
 1911 {
 1912 
 1913         switch (type) {
 1914         case MOD_LOAD:
 1915                 MROUTER6_LOCK_INIT();
 1916                 MFC6_LOCK_INIT();
 1917                 MIF6_LOCK_INIT();
 1918 
 1919                 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM,
 1920                         pim6_encapcheck,
 1921                         (const struct protosw *)&in6_pim_protosw, NULL);
 1922                 if (pim6_encap_cookie == NULL) {
 1923                         printf("ip6_mroute: unable to attach pim6 encap\n");
 1924                         MIF6_LOCK_DESTROY();
 1925                         MFC6_LOCK_DESTROY();
 1926                         MROUTER6_LOCK_DESTROY();
 1927                         return (EINVAL);
 1928                 }
 1929 
 1930                 ip6_mforward = X_ip6_mforward;
 1931                 ip6_mrouter_done = X_ip6_mrouter_done;
 1932                 ip6_mrouter_get = X_ip6_mrouter_get;
 1933                 ip6_mrouter_set = X_ip6_mrouter_set;
 1934                 mrt6_ioctl = X_mrt6_ioctl;
 1935                 break;
 1936 
 1937         case MOD_UNLOAD:
 1938                 if (V_ip6_mrouter != NULL)
 1939                         return EINVAL;
 1940 
 1941                 if (pim6_encap_cookie) {
 1942                         encap_detach(pim6_encap_cookie);
 1943                         pim6_encap_cookie = NULL;
 1944                 }
 1945                 X_ip6_mrouter_done();
 1946                 ip6_mforward = NULL;
 1947                 ip6_mrouter_done = NULL;
 1948                 ip6_mrouter_get = NULL;
 1949                 ip6_mrouter_set = NULL;
 1950                 mrt6_ioctl = NULL;
 1951 
 1952                 MIF6_LOCK_DESTROY();
 1953                 MFC6_LOCK_DESTROY();
 1954                 MROUTER6_LOCK_DESTROY();
 1955                 break;
 1956 
 1957         default:
 1958                 return (EOPNOTSUPP);
 1959         }
 1960 
 1961         return (0);
 1962 }
 1963 
 1964 static moduledata_t ip6_mroutemod = {
 1965         "ip6_mroute",
 1966         ip6_mroute_modevent,
 1967         0
 1968 };
 1969 
 1970 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);

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