The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/icmp6.c

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    1 /*      $FreeBSD: releng/6.1/sys/netinet6/icmp6.c 158179 2006-04-30 16:44:43Z cvs2svn $ */
    2 /*      $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */
    3 
    4 /*-
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*-
   34  * Copyright (c) 1982, 1986, 1988, 1993
   35  *      The Regents of the University of California.  All rights reserved.
   36  *
   37  * Redistribution and use in source and binary forms, with or without
   38  * modification, are permitted provided that the following conditions
   39  * are met:
   40  * 1. Redistributions of source code must retain the above copyright
   41  *    notice, this list of conditions and the following disclaimer.
   42  * 2. Redistributions in binary form must reproduce the above copyright
   43  *    notice, this list of conditions and the following disclaimer in the
   44  *    documentation and/or other materials provided with the distribution.
   45  * 4. Neither the name of the University nor the names of its contributors
   46  *    may be used to endorse or promote products derived from this software
   47  *    without specific prior written permission.
   48  *
   49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   59  * SUCH DAMAGE.
   60  *
   61  *      @(#)ip_icmp.c   8.2 (Berkeley) 1/4/94
   62  */
   63 
   64 #include "opt_inet.h"
   65 #include "opt_inet6.h"
   66 #include "opt_ipsec.h"
   67 
   68 #include <sys/param.h>
   69 #include <sys/domain.h>
   70 #include <sys/kernel.h>
   71 #include <sys/lock.h>
   72 #include <sys/malloc.h>
   73 #include <sys/mbuf.h>
   74 #include <sys/protosw.h>
   75 #include <sys/signalvar.h>
   76 #include <sys/socket.h>
   77 #include <sys/socketvar.h>
   78 #include <sys/sx.h>
   79 #include <sys/syslog.h>
   80 #include <sys/systm.h>
   81 #include <sys/time.h>
   82 
   83 #include <net/if.h>
   84 #include <net/if_dl.h>
   85 #include <net/if_types.h>
   86 #include <net/route.h>
   87 
   88 #include <netinet/in.h>
   89 #include <netinet/in_pcb.h>
   90 #include <netinet/in_var.h>
   91 #include <netinet/ip6.h>
   92 #include <netinet/icmp6.h>
   93 #include <netinet/tcp_var.h>
   94 #include <netinet6/in6_ifattach.h>
   95 #include <netinet6/in6_pcb.h>
   96 #include <netinet6/ip6protosw.h>
   97 #include <netinet6/ip6_var.h>
   98 #include <netinet6/scope6_var.h>
   99 #include <netinet6/mld6_var.h>
  100 #include <netinet6/nd6.h>
  101 
  102 #ifdef IPSEC
  103 #include <netinet6/ipsec.h>
  104 #include <netkey/key.h>
  105 #endif
  106 
  107 #ifdef FAST_IPSEC
  108 #include <netipsec/ipsec.h>
  109 #include <netipsec/key.h>
  110 #endif
  111 
  112 #include <net/net_osdep.h>
  113 
  114 extern struct domain inet6domain;
  115 
  116 struct icmp6stat icmp6stat;
  117 
  118 extern struct inpcbinfo ripcbinfo;
  119 extern struct inpcbhead ripcb;
  120 extern int icmp6errppslim;
  121 static int icmp6errpps_count = 0;
  122 static struct timeval icmp6errppslim_last;
  123 extern int icmp6_nodeinfo;
  124 
  125 static void icmp6_errcount __P((struct icmp6errstat *, int, int));
  126 static int icmp6_rip6_input __P((struct mbuf **, int));
  127 static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int));
  128 static const char *icmp6_redirect_diag __P((struct in6_addr *,
  129         struct in6_addr *, struct in6_addr *));
  130 static struct mbuf *ni6_input __P((struct mbuf *, int));
  131 static struct mbuf *ni6_nametodns __P((const char *, int, int));
  132 static int ni6_dnsmatch __P((const char *, int, const char *, int));
  133 static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
  134                           struct ifnet **, struct in6_addr *));
  135 static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
  136                                 struct ifnet *, int));
  137 static int icmp6_notify_error __P((struct mbuf **, int, int, int));
  138 
  139 
  140 void
  141 icmp6_init()
  142 {
  143         mld6_init();
  144 }
  145 
  146 static void
  147 icmp6_errcount(stat, type, code)
  148         struct icmp6errstat *stat;
  149         int type, code;
  150 {
  151         switch (type) {
  152         case ICMP6_DST_UNREACH:
  153                 switch (code) {
  154                 case ICMP6_DST_UNREACH_NOROUTE:
  155                         stat->icp6errs_dst_unreach_noroute++;
  156                         return;
  157                 case ICMP6_DST_UNREACH_ADMIN:
  158                         stat->icp6errs_dst_unreach_admin++;
  159                         return;
  160                 case ICMP6_DST_UNREACH_BEYONDSCOPE:
  161                         stat->icp6errs_dst_unreach_beyondscope++;
  162                         return;
  163                 case ICMP6_DST_UNREACH_ADDR:
  164                         stat->icp6errs_dst_unreach_addr++;
  165                         return;
  166                 case ICMP6_DST_UNREACH_NOPORT:
  167                         stat->icp6errs_dst_unreach_noport++;
  168                         return;
  169                 }
  170                 break;
  171         case ICMP6_PACKET_TOO_BIG:
  172                 stat->icp6errs_packet_too_big++;
  173                 return;
  174         case ICMP6_TIME_EXCEEDED:
  175                 switch (code) {
  176                 case ICMP6_TIME_EXCEED_TRANSIT:
  177                         stat->icp6errs_time_exceed_transit++;
  178                         return;
  179                 case ICMP6_TIME_EXCEED_REASSEMBLY:
  180                         stat->icp6errs_time_exceed_reassembly++;
  181                         return;
  182                 }
  183                 break;
  184         case ICMP6_PARAM_PROB:
  185                 switch (code) {
  186                 case ICMP6_PARAMPROB_HEADER:
  187                         stat->icp6errs_paramprob_header++;
  188                         return;
  189                 case ICMP6_PARAMPROB_NEXTHEADER:
  190                         stat->icp6errs_paramprob_nextheader++;
  191                         return;
  192                 case ICMP6_PARAMPROB_OPTION:
  193                         stat->icp6errs_paramprob_option++;
  194                         return;
  195                 }
  196                 break;
  197         case ND_REDIRECT:
  198                 stat->icp6errs_redirect++;
  199                 return;
  200         }
  201         stat->icp6errs_unknown++;
  202 }
  203 
  204 /*
  205  * A wrapper function for icmp6_error() necessary when the erroneous packet
  206  * may not contain enough scope zone information.
  207  */
  208 void
  209 icmp6_error2(m, type, code, param, ifp)
  210         struct mbuf *m;
  211         int type, code, param;
  212         struct ifnet *ifp;
  213 {
  214         struct ip6_hdr *ip6;
  215 
  216         if (ifp == NULL)
  217                 return;
  218 
  219 #ifndef PULLDOWN_TEST
  220         IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
  221 #else
  222         if (m->m_len < sizeof(struct ip6_hdr)) {
  223                 m = m_pullup(m, sizeof(struct ip6_hdr));
  224                 if (m == NULL)
  225                         return;
  226         }
  227 #endif
  228 
  229         ip6 = mtod(m, struct ip6_hdr *);
  230 
  231         if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
  232                 return;
  233         if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
  234                 return;
  235 
  236         icmp6_error(m, type, code, param);
  237 }
  238 
  239 /*
  240  * Generate an error packet of type error in response to bad IP6 packet.
  241  */
  242 void
  243 icmp6_error(m, type, code, param)
  244         struct mbuf *m;
  245         int type, code, param;
  246 {
  247         struct ip6_hdr *oip6, *nip6;
  248         struct icmp6_hdr *icmp6;
  249         u_int preplen;
  250         int off;
  251         int nxt;
  252 
  253         icmp6stat.icp6s_error++;
  254 
  255         /* count per-type-code statistics */
  256         icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
  257 
  258 #ifdef M_DECRYPTED      /*not openbsd*/
  259         if (m->m_flags & M_DECRYPTED) {
  260                 icmp6stat.icp6s_canterror++;
  261                 goto freeit;
  262         }
  263 #endif
  264 
  265 #ifndef PULLDOWN_TEST
  266         IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
  267 #else
  268         if (m->m_len < sizeof(struct ip6_hdr)) {
  269                 m = m_pullup(m, sizeof(struct ip6_hdr));
  270                 if (m == NULL)
  271                         return;
  272         }
  273 #endif
  274         oip6 = mtod(m, struct ip6_hdr *);
  275 
  276         /*
  277          * If the destination address of the erroneous packet is a multicast
  278          * address, or the packet was sent using link-layer multicast,
  279          * we should basically suppress sending an error (RFC 2463, Section
  280          * 2.4).
  281          * We have two exceptions (the item e.2 in that section):
  282          * - the Pakcet Too Big message can be sent for path MTU discovery.
  283          * - the Parameter Problem Message that can be allowed an icmp6 error
  284          *   in the option type field.  This check has been done in
  285          *   ip6_unknown_opt(), so we can just check the type and code.
  286          */
  287         if ((m->m_flags & (M_BCAST|M_MCAST) ||
  288              IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
  289             (type != ICMP6_PACKET_TOO_BIG &&
  290              (type != ICMP6_PARAM_PROB ||
  291               code != ICMP6_PARAMPROB_OPTION)))
  292                 goto freeit;
  293 
  294         /*
  295          * RFC 2463, 2.4 (e.5): source address check.
  296          * XXX: the case of anycast source?
  297          */
  298         if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
  299             IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
  300                 goto freeit;
  301 
  302         /*
  303          * If we are about to send ICMPv6 against ICMPv6 error/redirect,
  304          * don't do it.
  305          */
  306         nxt = -1;
  307         off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
  308         if (off >= 0 && nxt == IPPROTO_ICMPV6) {
  309                 struct icmp6_hdr *icp;
  310 
  311 #ifndef PULLDOWN_TEST
  312                 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
  313                 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
  314 #else
  315                 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
  316                         sizeof(*icp));
  317                 if (icp == NULL) {
  318                         icmp6stat.icp6s_tooshort++;
  319                         return;
  320                 }
  321 #endif
  322                 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
  323                     icp->icmp6_type == ND_REDIRECT) {
  324                         /*
  325                          * ICMPv6 error
  326                          * Special case: for redirect (which is
  327                          * informational) we must not send icmp6 error.
  328                          */
  329                         icmp6stat.icp6s_canterror++;
  330                         goto freeit;
  331                 } else {
  332                         /* ICMPv6 informational - send the error */
  333                 }
  334         } else {
  335                 /* non-ICMPv6 - send the error */
  336         }
  337 
  338         oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
  339 
  340         /* Finally, do rate limitation check. */
  341         if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
  342                 icmp6stat.icp6s_toofreq++;
  343                 goto freeit;
  344         }
  345 
  346         /*
  347          * OK, ICMP6 can be generated.
  348          */
  349 
  350         if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
  351                 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
  352 
  353         preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
  354         M_PREPEND(m, preplen, M_DONTWAIT);
  355         if (m && m->m_len < preplen)
  356                 m = m_pullup(m, preplen);
  357         if (m == NULL) {
  358                 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
  359                 return;
  360         }
  361 
  362         nip6 = mtod(m, struct ip6_hdr *);
  363         nip6->ip6_src  = oip6->ip6_src;
  364         nip6->ip6_dst  = oip6->ip6_dst;
  365 
  366         in6_clearscope(&oip6->ip6_src);
  367         in6_clearscope(&oip6->ip6_dst);
  368 
  369         icmp6 = (struct icmp6_hdr *)(nip6 + 1);
  370         icmp6->icmp6_type = type;
  371         icmp6->icmp6_code = code;
  372         icmp6->icmp6_pptr = htonl((u_int32_t)param);
  373 
  374         /*
  375          * icmp6_reflect() is designed to be in the input path.
  376          * icmp6_error() can be called from both input and output path,
  377          * and if we are in output path rcvif could contain bogus value.
  378          * clear m->m_pkthdr.rcvif for safety, we should have enough scope
  379          * information in ip header (nip6).
  380          */
  381         m->m_pkthdr.rcvif = NULL;
  382 
  383         icmp6stat.icp6s_outhist[type]++;
  384         icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
  385 
  386         return;
  387 
  388   freeit:
  389         /*
  390          * If we can't tell whether or not we can generate ICMP6, free it.
  391          */
  392         m_freem(m);
  393 }
  394 
  395 /*
  396  * Process a received ICMP6 message.
  397  */
  398 int
  399 icmp6_input(mp, offp, proto)
  400         struct mbuf **mp;
  401         int *offp, proto;
  402 {
  403         struct mbuf *m = *mp, *n;
  404         struct ip6_hdr *ip6, *nip6;
  405         struct icmp6_hdr *icmp6, *nicmp6;
  406         int off = *offp;
  407         int icmp6len = m->m_pkthdr.len - *offp;
  408         int code, sum, noff;
  409 
  410 #ifndef PULLDOWN_TEST
  411         IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
  412         /* m might change if M_LOOP.  So, call mtod after this */
  413 #endif
  414 
  415         /*
  416          * Locate icmp6 structure in mbuf, and check
  417          * that not corrupted and of at least minimum length
  418          */
  419 
  420         ip6 = mtod(m, struct ip6_hdr *);
  421         if (icmp6len < sizeof(struct icmp6_hdr)) {
  422                 icmp6stat.icp6s_tooshort++;
  423                 goto freeit;
  424         }
  425 
  426         /*
  427          * calculate the checksum
  428          */
  429 #ifndef PULLDOWN_TEST
  430         icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
  431 #else
  432         IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
  433         if (icmp6 == NULL) {
  434                 icmp6stat.icp6s_tooshort++;
  435                 return IPPROTO_DONE;
  436         }
  437 #endif
  438         code = icmp6->icmp6_code;
  439 
  440         if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
  441                 nd6log((LOG_ERR,
  442                     "ICMP6 checksum error(%d|%x) %s\n",
  443                     icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
  444                 icmp6stat.icp6s_checksum++;
  445                 goto freeit;
  446         }
  447 
  448         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  449                 /*
  450                  * Deliver very specific ICMP6 type only.
  451                  * This is important to deliver TOOBIG.  Otherwise PMTUD
  452                  * will not work.
  453                  */
  454                 switch (icmp6->icmp6_type) {
  455                 case ICMP6_DST_UNREACH:
  456                 case ICMP6_PACKET_TOO_BIG:
  457                 case ICMP6_TIME_EXCEEDED:
  458                         break;
  459                 default:
  460                         goto freeit;
  461                 }
  462         }
  463 
  464         icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
  465         icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
  466         if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
  467                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
  468 
  469         switch (icmp6->icmp6_type) {
  470         case ICMP6_DST_UNREACH:
  471                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
  472                 switch (code) {
  473                 case ICMP6_DST_UNREACH_NOROUTE:
  474                         code = PRC_UNREACH_NET;
  475                         break;
  476                 case ICMP6_DST_UNREACH_ADMIN:
  477                         icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
  478                         code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
  479                         break;
  480                 case ICMP6_DST_UNREACH_ADDR:
  481                         code = PRC_HOSTDEAD;
  482                         break;
  483                 case ICMP6_DST_UNREACH_BEYONDSCOPE:
  484                         /* I mean "source address was incorrect." */
  485                         code = PRC_PARAMPROB;
  486                         break;
  487                 case ICMP6_DST_UNREACH_NOPORT:
  488                         code = PRC_UNREACH_PORT;
  489                         break;
  490                 default:
  491                         goto badcode;
  492                 }
  493                 goto deliver;
  494                 break;
  495 
  496         case ICMP6_PACKET_TOO_BIG:
  497                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
  498 
  499                 /* validation is made in icmp6_mtudisc_update */
  500 
  501                 code = PRC_MSGSIZE;
  502 
  503                 /*
  504                  * Updating the path MTU will be done after examining
  505                  * intermediate extension headers.
  506                  */
  507                 goto deliver;
  508                 break;
  509 
  510         case ICMP6_TIME_EXCEEDED:
  511                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
  512                 switch (code) {
  513                 case ICMP6_TIME_EXCEED_TRANSIT:
  514                         code = PRC_TIMXCEED_INTRANS;
  515                         break;
  516                 case ICMP6_TIME_EXCEED_REASSEMBLY:
  517                         code = PRC_TIMXCEED_REASS;
  518                         break;
  519                 default:
  520                         goto badcode;
  521                 }
  522                 goto deliver;
  523                 break;
  524 
  525         case ICMP6_PARAM_PROB:
  526                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
  527                 switch (code) {
  528                 case ICMP6_PARAMPROB_NEXTHEADER:
  529                         code = PRC_UNREACH_PROTOCOL;
  530                         break;
  531                 case ICMP6_PARAMPROB_HEADER:
  532                 case ICMP6_PARAMPROB_OPTION:
  533                         code = PRC_PARAMPROB;
  534                         break;
  535                 default:
  536                         goto badcode;
  537                 }
  538                 goto deliver;
  539                 break;
  540 
  541         case ICMP6_ECHO_REQUEST:
  542                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
  543                 if (code != 0)
  544                         goto badcode;
  545                 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
  546                         /* Give up remote */
  547                         break;
  548                 }
  549                 if ((n->m_flags & M_EXT) != 0
  550                  || n->m_len < off + sizeof(struct icmp6_hdr)) {
  551                         struct mbuf *n0 = n;
  552                         const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
  553                         int n0len;
  554 
  555                         MGETHDR(n, M_DONTWAIT, n0->m_type);
  556                         n0len = n0->m_pkthdr.len;       /* save for use below */
  557                         if (n)
  558                                 M_MOVE_PKTHDR(n, n0);
  559                         if (n && maxlen >= MHLEN) {
  560                                 MCLGET(n, M_DONTWAIT);
  561                                 if ((n->m_flags & M_EXT) == 0) {
  562                                         m_free(n);
  563                                         n = NULL;
  564                                 }
  565                         }
  566                         if (n == NULL) {
  567                                 /* Give up remote */
  568                                 m_freem(n0);
  569                                 break;
  570                         }
  571                         /*
  572                          * Copy IPv6 and ICMPv6 only.
  573                          */
  574                         nip6 = mtod(n, struct ip6_hdr *);
  575                         bcopy(ip6, nip6, sizeof(struct ip6_hdr));
  576                         nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
  577                         bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
  578                         noff = sizeof(struct ip6_hdr);
  579                         /* new mbuf contains only ipv6+icmpv6 headers */
  580                         n->m_len = noff + sizeof(struct icmp6_hdr);
  581                         /*
  582                          * Adjust mbuf.  ip6_plen will be adjusted in
  583                          * ip6_output().
  584                          */
  585                         m_adj(n0, off + sizeof(struct icmp6_hdr));
  586                         /* recalculate complete packet size */
  587                         n->m_pkthdr.len = n0len + (noff - off);
  588                         n->m_next = n0;
  589                 } else {
  590                         nip6 = mtod(n, struct ip6_hdr *);
  591                         nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
  592                         noff = off;
  593                 }
  594                 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
  595                 nicmp6->icmp6_code = 0;
  596                 if (n) {
  597                         icmp6stat.icp6s_reflect++;
  598                         icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
  599                         icmp6_reflect(n, noff);
  600                 }
  601                 break;
  602 
  603         case ICMP6_ECHO_REPLY:
  604                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
  605                 if (code != 0)
  606                         goto badcode;
  607                 break;
  608 
  609         case MLD_LISTENER_QUERY:
  610         case MLD_LISTENER_REPORT:
  611                 if (icmp6len < sizeof(struct mld_hdr))
  612                         goto badlen;
  613                 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
  614                         icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
  615                 else
  616                         icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
  617                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  618                         /* give up local */
  619                         mld6_input(m, off);
  620                         m = NULL;
  621                         goto freeit;
  622                 }
  623                 mld6_input(n, off);
  624                 /* m stays. */
  625                 break;
  626 
  627         case MLD_LISTENER_DONE:
  628                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
  629                 if (icmp6len < sizeof(struct mld_hdr))  /* necessary? */
  630                         goto badlen;
  631                 break;          /* nothing to be done in kernel */
  632 
  633         case MLD_MTRACE_RESP:
  634         case MLD_MTRACE:
  635                 /* XXX: these two are experimental.  not officially defined. */
  636                 /* XXX: per-interface statistics? */
  637                 break;          /* just pass it to applications */
  638 
  639         case ICMP6_WRUREQUEST:  /* ICMP6_FQDN_QUERY */
  640             {
  641                 enum { WRU, FQDN } mode;
  642 
  643                 if (!icmp6_nodeinfo)
  644                         break;
  645 
  646                 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
  647                         mode = WRU;
  648                 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
  649                         mode = FQDN;
  650                 else
  651                         goto badlen;
  652 
  653 #define hostnamelen     strlen(hostname)
  654                 if (mode == FQDN) {
  655 #ifndef PULLDOWN_TEST
  656                         IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
  657                             IPPROTO_DONE);
  658 #endif
  659                         n = m_copy(m, 0, M_COPYALL);
  660                         if (n)
  661                                 n = ni6_input(n, off);
  662                         /* XXX meaningless if n == NULL */
  663                         noff = sizeof(struct ip6_hdr);
  664                 } else {
  665                         u_char *p;
  666                         int maxlen, maxhlen;
  667 
  668                         if ((icmp6_nodeinfo & 5) != 5)
  669                                 break;
  670 
  671                         if (code != 0)
  672                                 goto badcode;
  673                         maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
  674                         if (maxlen >= MCLBYTES) {
  675                                 /* Give up remote */
  676                                 break;
  677                         }
  678                         MGETHDR(n, M_DONTWAIT, m->m_type);
  679                         if (n && maxlen > MHLEN) {
  680                                 MCLGET(n, M_DONTWAIT);
  681                                 if ((n->m_flags & M_EXT) == 0) {
  682                                         m_free(n);
  683                                         n = NULL;
  684                                 }
  685                         }
  686                         if (!m_dup_pkthdr(n, m, M_DONTWAIT)) {
  687                                 /*
  688                                  * Previous code did a blind M_COPY_PKTHDR
  689                                  * and said "just for rcvif".  If true, then
  690                                  * we could tolerate the dup failing (due to
  691                                  * the deep copy of the tag chain).  For now
  692                                  * be conservative and just fail.
  693                                  */
  694                                 m_free(n);
  695                                 n = NULL;
  696                         }
  697                         if (n == NULL) {
  698                                 /* Give up remote */
  699                                 break;
  700                         }
  701                         n->m_pkthdr.rcvif = NULL;
  702                         n->m_len = 0;
  703                         maxhlen = M_TRAILINGSPACE(n) - maxlen;
  704                         if (maxhlen > hostnamelen)
  705                                 maxhlen = hostnamelen;
  706                         /*
  707                          * Copy IPv6 and ICMPv6 only.
  708                          */
  709                         nip6 = mtod(n, struct ip6_hdr *);
  710                         bcopy(ip6, nip6, sizeof(struct ip6_hdr));
  711                         nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
  712                         bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
  713                         p = (u_char *)(nicmp6 + 1);
  714                         bzero(p, 4);
  715                         bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
  716                         noff = sizeof(struct ip6_hdr);
  717                         n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
  718                                 sizeof(struct icmp6_hdr) + 4 + maxhlen;
  719                         nicmp6->icmp6_type = ICMP6_WRUREPLY;
  720                         nicmp6->icmp6_code = 0;
  721                 }
  722 #undef hostnamelen
  723                 if (n) {
  724                         icmp6stat.icp6s_reflect++;
  725                         icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
  726                         icmp6_reflect(n, noff);
  727                 }
  728                 break;
  729             }
  730 
  731         case ICMP6_WRUREPLY:
  732                 if (code != 0)
  733                         goto badcode;
  734                 break;
  735 
  736         case ND_ROUTER_SOLICIT:
  737                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
  738                 if (code != 0)
  739                         goto badcode;
  740                 if (icmp6len < sizeof(struct nd_router_solicit))
  741                         goto badlen;
  742                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  743                         /* give up local */
  744                         nd6_rs_input(m, off, icmp6len);
  745                         m = NULL;
  746                         goto freeit;
  747                 }
  748                 nd6_rs_input(n, off, icmp6len);
  749                 /* m stays. */
  750                 break;
  751 
  752         case ND_ROUTER_ADVERT:
  753                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
  754                 if (code != 0)
  755                         goto badcode;
  756                 if (icmp6len < sizeof(struct nd_router_advert))
  757                         goto badlen;
  758                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  759                         /* give up local */
  760                         nd6_ra_input(m, off, icmp6len);
  761                         m = NULL;
  762                         goto freeit;
  763                 }
  764                 nd6_ra_input(n, off, icmp6len);
  765                 /* m stays. */
  766                 break;
  767 
  768         case ND_NEIGHBOR_SOLICIT:
  769                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
  770                 if (code != 0)
  771                         goto badcode;
  772                 if (icmp6len < sizeof(struct nd_neighbor_solicit))
  773                         goto badlen;
  774                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  775                         /* give up local */
  776                         nd6_ns_input(m, off, icmp6len);
  777                         m = NULL;
  778                         goto freeit;
  779                 }
  780                 nd6_ns_input(n, off, icmp6len);
  781                 /* m stays. */
  782                 break;
  783 
  784         case ND_NEIGHBOR_ADVERT:
  785                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
  786                 if (code != 0)
  787                         goto badcode;
  788                 if (icmp6len < sizeof(struct nd_neighbor_advert))
  789                         goto badlen;
  790                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  791                         /* give up local */
  792                         nd6_na_input(m, off, icmp6len);
  793                         m = NULL;
  794                         goto freeit;
  795                 }
  796                 nd6_na_input(n, off, icmp6len);
  797                 /* m stays. */
  798                 break;
  799 
  800         case ND_REDIRECT:
  801                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
  802                 if (code != 0)
  803                         goto badcode;
  804                 if (icmp6len < sizeof(struct nd_redirect))
  805                         goto badlen;
  806                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  807                         /* give up local */
  808                         icmp6_redirect_input(m, off);
  809                         m = NULL;
  810                         goto freeit;
  811                 }
  812                 icmp6_redirect_input(n, off);
  813                 /* m stays. */
  814                 break;
  815 
  816         case ICMP6_ROUTER_RENUMBERING:
  817                 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
  818                     code != ICMP6_ROUTER_RENUMBERING_RESULT)
  819                         goto badcode;
  820                 if (icmp6len < sizeof(struct icmp6_router_renum))
  821                         goto badlen;
  822                 break;
  823 
  824         default:
  825                 nd6log((LOG_DEBUG,
  826                     "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
  827                     icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
  828                     ip6_sprintf(&ip6->ip6_dst),
  829                     m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
  830                 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
  831                         /* ICMPv6 error: MUST deliver it by spec... */
  832                         code = PRC_NCMDS;
  833                         /* deliver */
  834                 } else {
  835                         /* ICMPv6 informational: MUST not deliver */
  836                         break;
  837                 }
  838         deliver:
  839                 if (icmp6_notify_error(&m, off, icmp6len, code)) {
  840                         /* In this case, m should've been freed. */
  841                         return (IPPROTO_DONE);
  842                 }
  843                 break;
  844 
  845         badcode:
  846                 icmp6stat.icp6s_badcode++;
  847                 break;
  848 
  849         badlen:
  850                 icmp6stat.icp6s_badlen++;
  851                 break;
  852         }
  853 
  854         /* deliver the packet to appropriate sockets */
  855         icmp6_rip6_input(&m, *offp);
  856 
  857         return IPPROTO_DONE;
  858 
  859  freeit:
  860         m_freem(m);
  861         return IPPROTO_DONE;
  862 }
  863 
  864 static int
  865 icmp6_notify_error(mp, off, icmp6len, code)
  866         struct mbuf **mp;
  867         int off, icmp6len, code;
  868 {
  869         struct mbuf *m = *mp;
  870         struct icmp6_hdr *icmp6;
  871         struct ip6_hdr *eip6;
  872         u_int32_t notifymtu;
  873         struct sockaddr_in6 icmp6src, icmp6dst;
  874 
  875         if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
  876                 icmp6stat.icp6s_tooshort++;
  877                 goto freeit;
  878         }
  879 #ifndef PULLDOWN_TEST
  880         IP6_EXTHDR_CHECK(m, off,
  881             sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
  882         icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
  883 #else
  884         IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
  885             sizeof(*icmp6) + sizeof(struct ip6_hdr));
  886         if (icmp6 == NULL) {
  887                 icmp6stat.icp6s_tooshort++;
  888                 return (-1);
  889         }
  890 #endif
  891         eip6 = (struct ip6_hdr *)(icmp6 + 1);
  892 
  893         /* Detect the upper level protocol */
  894         {
  895                 void (*ctlfunc) __P((int, struct sockaddr *, void *));
  896                 u_int8_t nxt = eip6->ip6_nxt;
  897                 int eoff = off + sizeof(struct icmp6_hdr) +
  898                     sizeof(struct ip6_hdr);
  899                 struct ip6ctlparam ip6cp;
  900                 struct in6_addr *finaldst = NULL;
  901                 int icmp6type = icmp6->icmp6_type;
  902                 struct ip6_frag *fh;
  903                 struct ip6_rthdr *rth;
  904                 struct ip6_rthdr0 *rth0;
  905                 int rthlen;
  906 
  907                 while (1) { /* XXX: should avoid infinite loop explicitly? */
  908                         struct ip6_ext *eh;
  909 
  910                         switch (nxt) {
  911                         case IPPROTO_HOPOPTS:
  912                         case IPPROTO_DSTOPTS:
  913                         case IPPROTO_AH:
  914 #ifndef PULLDOWN_TEST
  915                                 IP6_EXTHDR_CHECK(m, 0,
  916                                     eoff + sizeof(struct ip6_ext), -1);
  917                                 eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
  918 #else
  919                                 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
  920                                     eoff, sizeof(*eh));
  921                                 if (eh == NULL) {
  922                                         icmp6stat.icp6s_tooshort++;
  923                                         return (-1);
  924                                 }
  925 #endif
  926 
  927                                 if (nxt == IPPROTO_AH)
  928                                         eoff += (eh->ip6e_len + 2) << 2;
  929                                 else
  930                                         eoff += (eh->ip6e_len + 1) << 3;
  931                                 nxt = eh->ip6e_nxt;
  932                                 break;
  933                         case IPPROTO_ROUTING:
  934                                 /*
  935                                  * When the erroneous packet contains a
  936                                  * routing header, we should examine the
  937                                  * header to determine the final destination.
  938                                  * Otherwise, we can't properly update
  939                                  * information that depends on the final
  940                                  * destination (e.g. path MTU).
  941                                  */
  942 #ifndef PULLDOWN_TEST
  943                                 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
  944                                 rth = (struct ip6_rthdr *)
  945                                     (mtod(m, caddr_t) + eoff);
  946 #else
  947                                 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
  948                                     eoff, sizeof(*rth));
  949                                 if (rth == NULL) {
  950                                         icmp6stat.icp6s_tooshort++;
  951                                         return (-1);
  952                                 }
  953 #endif
  954                                 rthlen = (rth->ip6r_len + 1) << 3;
  955                                 /*
  956                                  * XXX: currently there is no
  957                                  * officially defined type other
  958                                  * than type-0.
  959                                  * Note that if the segment left field
  960                                  * is 0, all intermediate hops must
  961                                  * have been passed.
  962                                  */
  963                                 if (rth->ip6r_segleft &&
  964                                     rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
  965                                         int hops;
  966 
  967 #ifndef PULLDOWN_TEST
  968                                         IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
  969                                         rth0 = (struct ip6_rthdr0 *)
  970                                             (mtod(m, caddr_t) + eoff);
  971 #else
  972                                         IP6_EXTHDR_GET(rth0,
  973                                             struct ip6_rthdr0 *, m,
  974                                             eoff, rthlen);
  975                                         if (rth0 == NULL) {
  976                                                 icmp6stat.icp6s_tooshort++;
  977                                                 return (-1);
  978                                         }
  979 #endif
  980                                         /* just ignore a bogus header */
  981                                         if ((rth0->ip6r0_len % 2) == 0 &&
  982                                             (hops = rth0->ip6r0_len/2))
  983                                                 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
  984                                 }
  985                                 eoff += rthlen;
  986                                 nxt = rth->ip6r_nxt;
  987                                 break;
  988                         case IPPROTO_FRAGMENT:
  989 #ifndef PULLDOWN_TEST
  990                                 IP6_EXTHDR_CHECK(m, 0, eoff +
  991                                     sizeof(struct ip6_frag), -1);
  992                                 fh = (struct ip6_frag *)(mtod(m, caddr_t) +
  993                                     eoff);
  994 #else
  995                                 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
  996                                     eoff, sizeof(*fh));
  997                                 if (fh == NULL) {
  998                                         icmp6stat.icp6s_tooshort++;
  999                                         return (-1);
 1000                                 }
 1001 #endif
 1002                                 /*
 1003                                  * Data after a fragment header is meaningless
 1004                                  * unless it is the first fragment, but
 1005                                  * we'll go to the notify label for path MTU
 1006                                  * discovery.
 1007                                  */
 1008                                 if (fh->ip6f_offlg & IP6F_OFF_MASK)
 1009                                         goto notify;
 1010 
 1011                                 eoff += sizeof(struct ip6_frag);
 1012                                 nxt = fh->ip6f_nxt;
 1013                                 break;
 1014                         default:
 1015                                 /*
 1016                                  * This case includes ESP and the No Next
 1017                                  * Header.  In such cases going to the notify
 1018                                  * label does not have any meaning
 1019                                  * (i.e. ctlfunc will be NULL), but we go
 1020                                  * anyway since we might have to update
 1021                                  * path MTU information.
 1022                                  */
 1023                                 goto notify;
 1024                         }
 1025                 }
 1026           notify:
 1027 #ifndef PULLDOWN_TEST
 1028                 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
 1029 #else
 1030                 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
 1031                     sizeof(*icmp6) + sizeof(struct ip6_hdr));
 1032                 if (icmp6 == NULL) {
 1033                         icmp6stat.icp6s_tooshort++;
 1034                         return (-1);
 1035                 }
 1036 #endif
 1037 
 1038                 /*
 1039                  * retrieve parameters from the inner IPv6 header, and convert
 1040                  * them into sockaddr structures.
 1041                  * XXX: there is no guarantee that the source or destination
 1042                  * addresses of the inner packet are in the same scope as
 1043                  * the addresses of the icmp packet.  But there is no other
 1044                  * way to determine the zone.
 1045                  */
 1046                 eip6 = (struct ip6_hdr *)(icmp6 + 1);
 1047 
 1048                 bzero(&icmp6dst, sizeof(icmp6dst));
 1049                 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
 1050                 icmp6dst.sin6_family = AF_INET6;
 1051                 if (finaldst == NULL)
 1052                         icmp6dst.sin6_addr = eip6->ip6_dst;
 1053                 else
 1054                         icmp6dst.sin6_addr = *finaldst;
 1055                 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
 1056                         goto freeit;
 1057                 bzero(&icmp6src, sizeof(icmp6src));
 1058                 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
 1059                 icmp6src.sin6_family = AF_INET6;
 1060                 icmp6src.sin6_addr = eip6->ip6_src;
 1061                 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
 1062                         goto freeit;
 1063                 icmp6src.sin6_flowinfo =
 1064                     (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
 1065 
 1066                 if (finaldst == NULL)
 1067                         finaldst = &eip6->ip6_dst;
 1068                 ip6cp.ip6c_m = m;
 1069                 ip6cp.ip6c_icmp6 = icmp6;
 1070                 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
 1071                 ip6cp.ip6c_off = eoff;
 1072                 ip6cp.ip6c_finaldst = finaldst;
 1073                 ip6cp.ip6c_src = &icmp6src;
 1074                 ip6cp.ip6c_nxt = nxt;
 1075 
 1076                 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
 1077                         notifymtu = ntohl(icmp6->icmp6_mtu);
 1078                         ip6cp.ip6c_cmdarg = (void *)&notifymtu;
 1079                         icmp6_mtudisc_update(&ip6cp, 1);        /*XXX*/
 1080                 }
 1081 
 1082                 ctlfunc = (void (*) __P((int, struct sockaddr *, void *)))
 1083                     (inet6sw[ip6_protox[nxt]].pr_ctlinput);
 1084                 if (ctlfunc) {
 1085                         (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
 1086                             &ip6cp);
 1087                 }
 1088         }
 1089         *mp = m;
 1090         return (0);
 1091 
 1092   freeit:
 1093         m_freem(m);
 1094         return (-1);
 1095 }
 1096 
 1097 void
 1098 icmp6_mtudisc_update(ip6cp, validated)
 1099         struct ip6ctlparam *ip6cp;
 1100         int validated;
 1101 {
 1102         struct in6_addr *dst = ip6cp->ip6c_finaldst;
 1103         struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
 1104         struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
 1105         u_int mtu = ntohl(icmp6->icmp6_mtu);
 1106         struct in_conninfo inc;
 1107 
 1108 #if 0
 1109         /*
 1110          * RFC2460 section 5, last paragraph.
 1111          * even though minimum link MTU for IPv6 is IPV6_MMTU,
 1112          * we may see ICMPv6 too big with mtu < IPV6_MMTU
 1113          * due to packet translator in the middle.
 1114          * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
 1115          * special handling.
 1116          */
 1117         if (mtu < IPV6_MMTU)
 1118                 return;
 1119 #endif
 1120 
 1121         /*
 1122          * we reject ICMPv6 too big with abnormally small value.
 1123          * XXX what is the good definition of "abnormally small"?
 1124          */
 1125         if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
 1126                 return;
 1127 
 1128         if (!validated)
 1129                 return;
 1130 
 1131         bzero(&inc, sizeof(inc));
 1132         inc.inc_flags = 1; /* IPv6 */
 1133         inc.inc6_faddr = *dst;
 1134         if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
 1135                 return;
 1136 
 1137         if (mtu < tcp_maxmtu6(&inc)) {
 1138                 tcp_hc_updatemtu(&inc, mtu);
 1139                 icmp6stat.icp6s_pmtuchg++;
 1140         }
 1141 }
 1142 
 1143 /*
 1144  * Process a Node Information Query packet, based on
 1145  * draft-ietf-ipngwg-icmp-name-lookups-07.
 1146  *
 1147  * Spec incompatibilities:
 1148  * - IPv6 Subject address handling
 1149  * - IPv4 Subject address handling support missing
 1150  * - Proxy reply (answer even if it's not for me)
 1151  * - joins NI group address at in6_ifattach() time only, does not cope
 1152  *   with hostname changes by sethostname(3)
 1153  */
 1154 #define hostnamelen     strlen(hostname)
 1155 static struct mbuf *
 1156 ni6_input(m, off)
 1157         struct mbuf *m;
 1158         int off;
 1159 {
 1160         struct icmp6_nodeinfo *ni6, *nni6;
 1161         struct mbuf *n = NULL;
 1162         u_int16_t qtype;
 1163         int subjlen;
 1164         int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
 1165         struct ni_reply_fqdn *fqdn;
 1166         int addrs;              /* for NI_QTYPE_NODEADDR */
 1167         struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
 1168         struct in6_addr in6_subj; /* subject address */
 1169         struct ip6_hdr *ip6;
 1170         int oldfqdn = 0;        /* if 1, return pascal string (03 draft) */
 1171         char *subj = NULL;
 1172         struct in6_ifaddr *ia6 = NULL;
 1173 
 1174         ip6 = mtod(m, struct ip6_hdr *);
 1175 #ifndef PULLDOWN_TEST
 1176         ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
 1177 #else
 1178         IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
 1179         if (ni6 == NULL) {
 1180                 /* m is already reclaimed */
 1181                 return (NULL);
 1182         }
 1183 #endif
 1184 
 1185         /*
 1186          * Validate IPv6 destination address.
 1187          *
 1188          * The Responder must discard the Query without further processing
 1189          * unless it is one of the Responder's unicast or anycast addresses, or
 1190          * a link-local scope multicast address which the Responder has joined.
 1191          * [icmp-name-lookups-08, Section 4.]
 1192          */
 1193         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 1194                 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
 1195                         goto bad;
 1196                 /* else it's a link-local multicast, fine */
 1197         } else {                /* unicast or anycast */
 1198                 if ((ia6 = ip6_getdstifaddr(m)) == NULL)
 1199                         goto bad; /* XXX impossible */
 1200 
 1201                 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
 1202                     !(icmp6_nodeinfo & 4)) {
 1203                         nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
 1204                                 "a temporary address in %s:%d",
 1205                                __FILE__, __LINE__));
 1206                         goto bad;
 1207                 }
 1208         }
 1209 
 1210         /* validate query Subject field. */
 1211         qtype = ntohs(ni6->ni_qtype);
 1212         subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
 1213         switch (qtype) {
 1214         case NI_QTYPE_NOOP:
 1215         case NI_QTYPE_SUPTYPES:
 1216                 /* 07 draft */
 1217                 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
 1218                         break;
 1219                 /* FALLTHROUGH */
 1220         case NI_QTYPE_FQDN:
 1221         case NI_QTYPE_NODEADDR:
 1222         case NI_QTYPE_IPV4ADDR:
 1223                 switch (ni6->ni_code) {
 1224                 case ICMP6_NI_SUBJ_IPV6:
 1225 #if ICMP6_NI_SUBJ_IPV6 != 0
 1226                 case 0:
 1227 #endif
 1228                         /*
 1229                          * backward compatibility - try to accept 03 draft
 1230                          * format, where no Subject is present.
 1231                          */
 1232                         if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
 1233                             subjlen == 0) {
 1234                                 oldfqdn++;
 1235                                 break;
 1236                         }
 1237 #if ICMP6_NI_SUBJ_IPV6 != 0
 1238                         if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
 1239                                 goto bad;
 1240 #endif
 1241 
 1242                         if (subjlen != sizeof(struct in6_addr))
 1243                                 goto bad;
 1244 
 1245                         /*
 1246                          * Validate Subject address.
 1247                          *
 1248                          * Not sure what exactly "address belongs to the node"
 1249                          * means in the spec, is it just unicast, or what?
 1250                          *
 1251                          * At this moment we consider Subject address as
 1252                          * "belong to the node" if the Subject address equals
 1253                          * to the IPv6 destination address; validation for
 1254                          * IPv6 destination address should have done enough
 1255                          * check for us.
 1256                          *
 1257                          * We do not do proxy at this moment.
 1258                          */
 1259                         /* m_pulldown instead of copy? */
 1260                         m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
 1261                             subjlen, (caddr_t)&in6_subj);
 1262                         if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
 1263                                 goto bad;
 1264 
 1265                         subj = (char *)&in6_subj;
 1266                         if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
 1267                                 break;
 1268 
 1269                         /*
 1270                          * XXX if we are to allow other cases, we should really
 1271                          * be careful about scope here.
 1272                          * basically, we should disallow queries toward IPv6
 1273                          * destination X with subject Y,
 1274                          * if scope(X) > scope(Y).
 1275                          * if we allow scope(X) > scope(Y), it will result in
 1276                          * information leakage across scope boundary.
 1277                          */
 1278                         goto bad;
 1279 
 1280                 case ICMP6_NI_SUBJ_FQDN:
 1281                         /*
 1282                          * Validate Subject name with gethostname(3).
 1283                          *
 1284                          * The behavior may need some debate, since:
 1285                          * - we are not sure if the node has FQDN as
 1286                          *   hostname (returned by gethostname(3)).
 1287                          * - the code does wildcard match for truncated names.
 1288                          *   however, we are not sure if we want to perform
 1289                          *   wildcard match, if gethostname(3) side has
 1290                          *   truncated hostname.
 1291                          */
 1292                         n = ni6_nametodns(hostname, hostnamelen, 0);
 1293                         if (!n || n->m_next || n->m_len == 0)
 1294                                 goto bad;
 1295                         IP6_EXTHDR_GET(subj, char *, m,
 1296                             off + sizeof(struct icmp6_nodeinfo), subjlen);
 1297                         if (subj == NULL)
 1298                                 goto bad;
 1299                         if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
 1300                             n->m_len)) {
 1301                                 goto bad;
 1302                         }
 1303                         m_freem(n);
 1304                         n = NULL;
 1305                         break;
 1306 
 1307                 case ICMP6_NI_SUBJ_IPV4:        /* XXX: to be implemented? */
 1308                 default:
 1309                         goto bad;
 1310                 }
 1311                 break;
 1312         }
 1313 
 1314         /* refuse based on configuration.  XXX ICMP6_NI_REFUSED? */
 1315         switch (qtype) {
 1316         case NI_QTYPE_FQDN:
 1317                 if ((icmp6_nodeinfo & 1) == 0)
 1318                         goto bad;
 1319                 break;
 1320         case NI_QTYPE_NODEADDR:
 1321         case NI_QTYPE_IPV4ADDR:
 1322                 if ((icmp6_nodeinfo & 2) == 0)
 1323                         goto bad;
 1324                 break;
 1325         }
 1326 
 1327         /* guess reply length */
 1328         switch (qtype) {
 1329         case NI_QTYPE_NOOP:
 1330                 break;          /* no reply data */
 1331         case NI_QTYPE_SUPTYPES:
 1332                 replylen += sizeof(u_int32_t);
 1333                 break;
 1334         case NI_QTYPE_FQDN:
 1335                 /* XXX will append an mbuf */
 1336                 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
 1337                 break;
 1338         case NI_QTYPE_NODEADDR:
 1339                 addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
 1340                 if ((replylen += addrs * (sizeof(struct in6_addr) +
 1341                     sizeof(u_int32_t))) > MCLBYTES)
 1342                         replylen = MCLBYTES; /* XXX: will truncate pkt later */
 1343                 break;
 1344         case NI_QTYPE_IPV4ADDR:
 1345                 /* unsupported - should respond with unknown Qtype? */
 1346                 break;
 1347         default:
 1348                 /*
 1349                  * XXX: We must return a reply with the ICMP6 code
 1350                  * `unknown Qtype' in this case.  However we regard the case
 1351                  * as an FQDN query for backward compatibility.
 1352                  * Older versions set a random value to this field,
 1353                  * so it rarely varies in the defined qtypes.
 1354                  * But the mechanism is not reliable...
 1355                  * maybe we should obsolete older versions.
 1356                  */
 1357                 qtype = NI_QTYPE_FQDN;
 1358                 /* XXX will append an mbuf */
 1359                 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
 1360                 oldfqdn++;
 1361                 break;
 1362         }
 1363 
 1364         /* allocate an mbuf to reply. */
 1365         MGETHDR(n, M_DONTWAIT, m->m_type);
 1366         if (n == NULL) {
 1367                 m_freem(m);
 1368                 return (NULL);
 1369         }
 1370         M_MOVE_PKTHDR(n, m); /* just for recvif */
 1371         if (replylen > MHLEN) {
 1372                 if (replylen > MCLBYTES) {
 1373                         /*
 1374                          * XXX: should we try to allocate more? But MCLBYTES
 1375                          * is probably much larger than IPV6_MMTU...
 1376                          */
 1377                         goto bad;
 1378                 }
 1379                 MCLGET(n, M_DONTWAIT);
 1380                 if ((n->m_flags & M_EXT) == 0) {
 1381                         goto bad;
 1382                 }
 1383         }
 1384         n->m_pkthdr.len = n->m_len = replylen;
 1385 
 1386         /* copy mbuf header and IPv6 + Node Information base headers */
 1387         bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
 1388         nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
 1389         bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
 1390 
 1391         /* qtype dependent procedure */
 1392         switch (qtype) {
 1393         case NI_QTYPE_NOOP:
 1394                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1395                 nni6->ni_flags = 0;
 1396                 break;
 1397         case NI_QTYPE_SUPTYPES:
 1398         {
 1399                 u_int32_t v;
 1400                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1401                 nni6->ni_flags = htons(0x0000); /* raw bitmap */
 1402                 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
 1403                 v = (u_int32_t)htonl(0x0000000f);
 1404                 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
 1405                 break;
 1406         }
 1407         case NI_QTYPE_FQDN:
 1408                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1409                 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
 1410                     sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
 1411                 nni6->ni_flags = 0; /* XXX: meaningless TTL */
 1412                 fqdn->ni_fqdn_ttl = 0;  /* ditto. */
 1413                 /*
 1414                  * XXX do we really have FQDN in variable "hostname"?
 1415                  */
 1416                 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
 1417                 if (n->m_next == NULL)
 1418                         goto bad;
 1419                 /* XXX we assume that n->m_next is not a chain */
 1420                 if (n->m_next->m_next != NULL)
 1421                         goto bad;
 1422                 n->m_pkthdr.len += n->m_next->m_len;
 1423                 break;
 1424         case NI_QTYPE_NODEADDR:
 1425         {
 1426                 int lenlim, copied;
 1427 
 1428                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1429                 n->m_pkthdr.len = n->m_len =
 1430                     sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
 1431                 lenlim = M_TRAILINGSPACE(n);
 1432                 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
 1433                 /* XXX: reset mbuf length */
 1434                 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
 1435                     sizeof(struct icmp6_nodeinfo) + copied;
 1436                 break;
 1437         }
 1438         default:
 1439                 break;          /* XXX impossible! */
 1440         }
 1441 
 1442         nni6->ni_type = ICMP6_NI_REPLY;
 1443         m_freem(m);
 1444         return (n);
 1445 
 1446   bad:
 1447         m_freem(m);
 1448         if (n)
 1449                 m_freem(n);
 1450         return (NULL);
 1451 }
 1452 #undef hostnamelen
 1453 
 1454 /*
 1455  * make a mbuf with DNS-encoded string.  no compression support.
 1456  *
 1457  * XXX names with less than 2 dots (like "foo" or "foo.section") will be
 1458  * treated as truncated name (two \0 at the end).  this is a wild guess.
 1459  */
 1460 static struct mbuf *
 1461 ni6_nametodns(name, namelen, old)
 1462         const char *name;
 1463         int namelen;
 1464         int old;        /* return pascal string if non-zero */
 1465 {
 1466         struct mbuf *m;
 1467         char *cp, *ep;
 1468         const char *p, *q;
 1469         int i, len, nterm;
 1470 
 1471         if (old)
 1472                 len = namelen + 1;
 1473         else
 1474                 len = MCLBYTES;
 1475 
 1476         /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
 1477         MGET(m, M_DONTWAIT, MT_DATA);
 1478         if (m && len > MLEN) {
 1479                 MCLGET(m, M_DONTWAIT);
 1480                 if ((m->m_flags & M_EXT) == 0)
 1481                         goto fail;
 1482         }
 1483         if (!m)
 1484                 goto fail;
 1485         m->m_next = NULL;
 1486 
 1487         if (old) {
 1488                 m->m_len = len;
 1489                 *mtod(m, char *) = namelen;
 1490                 bcopy(name, mtod(m, char *) + 1, namelen);
 1491                 return m;
 1492         } else {
 1493                 m->m_len = 0;
 1494                 cp = mtod(m, char *);
 1495                 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
 1496 
 1497                 /* if not certain about my name, return empty buffer */
 1498                 if (namelen == 0)
 1499                         return m;
 1500 
 1501                 /*
 1502                  * guess if it looks like shortened hostname, or FQDN.
 1503                  * shortened hostname needs two trailing "\0".
 1504                  */
 1505                 i = 0;
 1506                 for (p = name; p < name + namelen; p++) {
 1507                         if (*p && *p == '.')
 1508                                 i++;
 1509                 }
 1510                 if (i < 2)
 1511                         nterm = 2;
 1512                 else
 1513                         nterm = 1;
 1514 
 1515                 p = name;
 1516                 while (cp < ep && p < name + namelen) {
 1517                         i = 0;
 1518                         for (q = p; q < name + namelen && *q && *q != '.'; q++)
 1519                                 i++;
 1520                         /* result does not fit into mbuf */
 1521                         if (cp + i + 1 >= ep)
 1522                                 goto fail;
 1523                         /*
 1524                          * DNS label length restriction, RFC1035 page 8.
 1525                          * "i == 0" case is included here to avoid returning
 1526                          * 0-length label on "foo..bar".
 1527                          */
 1528                         if (i <= 0 || i >= 64)
 1529                                 goto fail;
 1530                         *cp++ = i;
 1531                         bcopy(p, cp, i);
 1532                         cp += i;
 1533                         p = q;
 1534                         if (p < name + namelen && *p == '.')
 1535                                 p++;
 1536                 }
 1537                 /* termination */
 1538                 if (cp + nterm >= ep)
 1539                         goto fail;
 1540                 while (nterm-- > 0)
 1541                         *cp++ = '\0';
 1542                 m->m_len = cp - mtod(m, char *);
 1543                 return m;
 1544         }
 1545 
 1546         panic("should not reach here");
 1547         /* NOTREACHED */
 1548 
 1549  fail:
 1550         if (m)
 1551                 m_freem(m);
 1552         return NULL;
 1553 }
 1554 
 1555 /*
 1556  * check if two DNS-encoded string matches.  takes care of truncated
 1557  * form (with \0\0 at the end).  no compression support.
 1558  * XXX upper/lowercase match (see RFC2065)
 1559  */
 1560 static int
 1561 ni6_dnsmatch(a, alen, b, blen)
 1562         const char *a;
 1563         int alen;
 1564         const char *b;
 1565         int blen;
 1566 {
 1567         const char *a0, *b0;
 1568         int l;
 1569 
 1570         /* simplest case - need validation? */
 1571         if (alen == blen && bcmp(a, b, alen) == 0)
 1572                 return 1;
 1573 
 1574         a0 = a;
 1575         b0 = b;
 1576 
 1577         /* termination is mandatory */
 1578         if (alen < 2 || blen < 2)
 1579                 return 0;
 1580         if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
 1581                 return 0;
 1582         alen--;
 1583         blen--;
 1584 
 1585         while (a - a0 < alen && b - b0 < blen) {
 1586                 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
 1587                         return 0;
 1588 
 1589                 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
 1590                         return 0;
 1591                 /* we don't support compression yet */
 1592                 if (a[0] >= 64 || b[0] >= 64)
 1593                         return 0;
 1594 
 1595                 /* truncated case */
 1596                 if (a[0] == 0 && a - a0 == alen - 1)
 1597                         return 1;
 1598                 if (b[0] == 0 && b - b0 == blen - 1)
 1599                         return 1;
 1600                 if (a[0] == 0 || b[0] == 0)
 1601                         return 0;
 1602 
 1603                 if (a[0] != b[0])
 1604                         return 0;
 1605                 l = a[0];
 1606                 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
 1607                         return 0;
 1608                 if (bcmp(a + 1, b + 1, l) != 0)
 1609                         return 0;
 1610 
 1611                 a += 1 + l;
 1612                 b += 1 + l;
 1613         }
 1614 
 1615         if (a - a0 == alen && b - b0 == blen)
 1616                 return 1;
 1617         else
 1618                 return 0;
 1619 }
 1620 
 1621 /*
 1622  * calculate the number of addresses to be returned in the node info reply.
 1623  */
 1624 static int
 1625 ni6_addrs(ni6, m, ifpp, subj)
 1626         struct icmp6_nodeinfo *ni6;
 1627         struct mbuf *m;
 1628         struct ifnet **ifpp;
 1629         struct in6_addr *subj;
 1630 {
 1631         struct ifnet *ifp;
 1632         struct in6_ifaddr *ifa6;
 1633         struct ifaddr *ifa;
 1634         int addrs = 0, addrsofif, iffound = 0;
 1635         int niflags = ni6->ni_flags;
 1636 
 1637         if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
 1638                 switch (ni6->ni_code) {
 1639                 case ICMP6_NI_SUBJ_IPV6:
 1640                         if (subj == NULL) /* must be impossible... */
 1641                                 return (0);
 1642                         break;
 1643                 default:
 1644                         /*
 1645                          * XXX: we only support IPv6 subject address for
 1646                          * this Qtype.
 1647                          */
 1648                         return (0);
 1649                 }
 1650         }
 1651 
 1652         IFNET_RLOCK();
 1653         for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
 1654                 addrsofif = 0;
 1655                 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
 1656                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1657                                 continue;
 1658                         ifa6 = (struct in6_ifaddr *)ifa;
 1659 
 1660                         if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
 1661                             IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
 1662                                 iffound = 1;
 1663 
 1664                         /*
 1665                          * IPv4-mapped addresses can only be returned by a
 1666                          * Node Information proxy, since they represent
 1667                          * addresses of IPv4-only nodes, which perforce do
 1668                          * not implement this protocol.
 1669                          * [icmp-name-lookups-07, Section 5.4]
 1670                          * So we don't support NI_NODEADDR_FLAG_COMPAT in
 1671                          * this function at this moment.
 1672                          */
 1673 
 1674                         /* What do we have to do about ::1? */
 1675                         switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
 1676                         case IPV6_ADDR_SCOPE_LINKLOCAL:
 1677                                 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
 1678                                         continue;
 1679                                 break;
 1680                         case IPV6_ADDR_SCOPE_SITELOCAL:
 1681                                 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
 1682                                         continue;
 1683                                 break;
 1684                         case IPV6_ADDR_SCOPE_GLOBAL:
 1685                                 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
 1686                                         continue;
 1687                                 break;
 1688                         default:
 1689                                 continue;
 1690                         }
 1691 
 1692                         /*
 1693                          * check if anycast is okay.
 1694                          * XXX: just experimental.  not in the spec.
 1695                          */
 1696                         if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
 1697                             (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
 1698                                 continue; /* we need only unicast addresses */
 1699                         if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
 1700                             (icmp6_nodeinfo & 4) == 0) {
 1701                                 continue;
 1702                         }
 1703                         addrsofif++; /* count the address */
 1704                 }
 1705                 if (iffound) {
 1706                         *ifpp = ifp;
 1707                         IFNET_RUNLOCK();
 1708                         return (addrsofif);
 1709                 }
 1710 
 1711                 addrs += addrsofif;
 1712         }
 1713         IFNET_RUNLOCK();
 1714 
 1715         return (addrs);
 1716 }
 1717 
 1718 static int
 1719 ni6_store_addrs(ni6, nni6, ifp0, resid)
 1720         struct icmp6_nodeinfo *ni6, *nni6;
 1721         struct ifnet *ifp0;
 1722         int resid;
 1723 {
 1724         struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
 1725         struct in6_ifaddr *ifa6;
 1726         struct ifaddr *ifa;
 1727         struct ifnet *ifp_dep = NULL;
 1728         int copied = 0, allow_deprecated = 0;
 1729         u_char *cp = (u_char *)(nni6 + 1);
 1730         int niflags = ni6->ni_flags;
 1731         u_int32_t ltime;
 1732 
 1733         if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
 1734                 return (0);     /* needless to copy */
 1735 
 1736         IFNET_RLOCK();
 1737   again:
 1738 
 1739         for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
 1740                 for (ifa = ifp->if_addrlist.tqh_first; ifa;
 1741                      ifa = ifa->ifa_list.tqe_next) {
 1742                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1743                                 continue;
 1744                         ifa6 = (struct in6_ifaddr *)ifa;
 1745 
 1746                         if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
 1747                             allow_deprecated == 0) {
 1748                                 /*
 1749                                  * prefererred address should be put before
 1750                                  * deprecated addresses.
 1751                                  */
 1752 
 1753                                 /* record the interface for later search */
 1754                                 if (ifp_dep == NULL)
 1755                                         ifp_dep = ifp;
 1756 
 1757                                 continue;
 1758                         } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
 1759                             allow_deprecated != 0)
 1760                                 continue; /* we now collect deprecated addrs */
 1761 
 1762                         /* What do we have to do about ::1? */
 1763                         switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
 1764                         case IPV6_ADDR_SCOPE_LINKLOCAL:
 1765                                 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
 1766                                         continue;
 1767                                 break;
 1768                         case IPV6_ADDR_SCOPE_SITELOCAL:
 1769                                 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
 1770                                         continue;
 1771                                 break;
 1772                         case IPV6_ADDR_SCOPE_GLOBAL:
 1773                                 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
 1774                                         continue;
 1775                                 break;
 1776                         default:
 1777                                 continue;
 1778                         }
 1779 
 1780                         /*
 1781                          * check if anycast is okay.
 1782                          * XXX: just experimental.  not in the spec.
 1783                          */
 1784                         if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
 1785                             (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
 1786                                 continue;
 1787                         if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
 1788                             (icmp6_nodeinfo & 4) == 0) {
 1789                                 continue;
 1790                         }
 1791 
 1792                         /* now we can copy the address */
 1793                         if (resid < sizeof(struct in6_addr) +
 1794                             sizeof(u_int32_t)) {
 1795                                 /*
 1796                                  * We give up much more copy.
 1797                                  * Set the truncate flag and return.
 1798                                  */
 1799                                 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
 1800                                 IFNET_RUNLOCK();
 1801                                 return (copied);
 1802                         }
 1803 
 1804                         /*
 1805                          * Set the TTL of the address.
 1806                          * The TTL value should be one of the following
 1807                          * according to the specification:
 1808                          *
 1809                          * 1. The remaining lifetime of a DHCP lease on the
 1810                          *    address, or
 1811                          * 2. The remaining Valid Lifetime of a prefix from
 1812                          *    which the address was derived through Stateless
 1813                          *    Autoconfiguration.
 1814                          *
 1815                          * Note that we currently do not support stateful
 1816                          * address configuration by DHCPv6, so the former
 1817                          * case can't happen.
 1818                          */
 1819                         if (ifa6->ia6_lifetime.ia6t_expire == 0)
 1820                                 ltime = ND6_INFINITE_LIFETIME;
 1821                         else {
 1822                                 if (ifa6->ia6_lifetime.ia6t_expire >
 1823                                     time_second)
 1824                                         ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
 1825                                 else
 1826                                         ltime = 0;
 1827                         }
 1828 
 1829                         bcopy(&ltime, cp, sizeof(u_int32_t));
 1830                         cp += sizeof(u_int32_t);
 1831 
 1832                         /* copy the address itself */
 1833                         bcopy(&ifa6->ia_addr.sin6_addr, cp,
 1834                             sizeof(struct in6_addr));
 1835                         in6_clearscope((struct in6_addr *)cp); /* XXX */
 1836                         cp += sizeof(struct in6_addr);
 1837 
 1838                         resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
 1839                         copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
 1840                 }
 1841                 if (ifp0)       /* we need search only on the specified IF */
 1842                         break;
 1843         }
 1844 
 1845         if (allow_deprecated == 0 && ifp_dep != NULL) {
 1846                 ifp = ifp_dep;
 1847                 allow_deprecated = 1;
 1848 
 1849                 goto again;
 1850         }
 1851 
 1852         IFNET_RUNLOCK();
 1853 
 1854         return (copied);
 1855 }
 1856 
 1857 /*
 1858  * XXX almost dup'ed code with rip6_input.
 1859  */
 1860 static int
 1861 icmp6_rip6_input(mp, off)
 1862         struct  mbuf **mp;
 1863         int     off;
 1864 {
 1865         struct mbuf *m = *mp;
 1866         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1867         struct in6pcb *in6p;
 1868         struct in6pcb *last = NULL;
 1869         struct sockaddr_in6 fromsa;
 1870         struct icmp6_hdr *icmp6;
 1871         struct mbuf *opts = NULL;
 1872 
 1873 #ifndef PULLDOWN_TEST
 1874         /* this is assumed to be safe. */
 1875         icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
 1876 #else
 1877         IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
 1878         if (icmp6 == NULL) {
 1879                 /* m is already reclaimed */
 1880                 return (IPPROTO_DONE);
 1881         }
 1882 #endif
 1883 
 1884         /*
 1885          * XXX: the address may have embedded scope zone ID, which should be
 1886          * hidden from applications.
 1887          */
 1888         bzero(&fromsa, sizeof(fromsa));
 1889         fromsa.sin6_family = AF_INET6;
 1890         fromsa.sin6_len = sizeof(struct sockaddr_in6);
 1891         fromsa.sin6_addr = ip6->ip6_src;
 1892         if (sa6_recoverscope(&fromsa)) {
 1893                 m_freem(m);
 1894                 return (IPPROTO_DONE);
 1895         }
 1896 
 1897         INP_INFO_RLOCK(&ripcbinfo);
 1898         LIST_FOREACH(in6p, &ripcb, inp_list) {
 1899                 INP_LOCK(in6p);
 1900                 if ((in6p->inp_vflag & INP_IPV6) == 0) {
 1901         docontinue:
 1902                         INP_UNLOCK(in6p);
 1903                         continue;
 1904                 }
 1905                 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
 1906                         goto docontinue;
 1907                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
 1908                    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
 1909                         goto docontinue;
 1910                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
 1911                    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
 1912                         goto docontinue;
 1913                 if (in6p->in6p_icmp6filt
 1914                     && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
 1915                                  in6p->in6p_icmp6filt))
 1916                         goto docontinue;
 1917                 if (last) {
 1918                         struct  mbuf *n = NULL;
 1919 
 1920                         /*
 1921                          * Recent network drivers tend to allocate a single
 1922                          * mbuf cluster, rather than to make a couple of
 1923                          * mbufs without clusters.  Also, since the IPv6 code
 1924                          * path tries to avoid m_pullup(), it is highly
 1925                          * probable that we still have an mbuf cluster here
 1926                          * even though the necessary length can be stored in an
 1927                          * mbuf's internal buffer.
 1928                          * Meanwhile, the default size of the receive socket
 1929                          * buffer for raw sockets is not so large.  This means
 1930                          * the possibility of packet loss is relatively higher
 1931                          * than before.  To avoid this scenario, we copy the
 1932                          * received data to a separate mbuf that does not use
 1933                          * a cluster, if possible.
 1934                          * XXX: it is better to copy the data after stripping
 1935                          * intermediate headers.
 1936                          */
 1937                         if ((m->m_flags & M_EXT) && m->m_next == NULL &&
 1938                             m->m_len <= MHLEN) {
 1939                                 MGET(n, M_DONTWAIT, m->m_type);
 1940                                 if (n != NULL) {
 1941                                         if (m_dup_pkthdr(n, m, M_NOWAIT)) {
 1942                                                 bcopy(m->m_data, n->m_data, 
 1943                                                       m->m_len);
 1944                                                 n->m_len = m->m_len;
 1945                                         } else {
 1946                                                 m_free(n);
 1947                                                 n = NULL;
 1948                                         }
 1949                                 }
 1950                         }
 1951                         if (n != NULL ||
 1952                             (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
 1953                                 if (last->in6p_flags & IN6P_CONTROLOPTS)
 1954                                         ip6_savecontrol(last, n, &opts);
 1955                                 /* strip intermediate headers */
 1956                                 m_adj(n, off);
 1957                                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 1958                                     (struct sockaddr *)&fromsa, n, opts)
 1959                                     == 0) {
 1960                                         /* should notify about lost packet */
 1961                                         m_freem(n);
 1962                                         if (opts) {
 1963                                                 m_freem(opts);
 1964                                         }
 1965                                 } else
 1966                                         sorwakeup(last->in6p_socket);
 1967                                 opts = NULL;
 1968                         }
 1969                         INP_UNLOCK(last);
 1970                 }
 1971                 last = in6p;
 1972         }
 1973         if (last) {
 1974                 if (last->in6p_flags & IN6P_CONTROLOPTS)
 1975                         ip6_savecontrol(last, m, &opts);
 1976                 /* strip intermediate headers */
 1977                 m_adj(m, off);
 1978 
 1979                 /* avoid using mbuf clusters if possible (see above) */
 1980                 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
 1981                     m->m_len <= MHLEN) {
 1982                         struct mbuf *n;
 1983 
 1984                         MGET(n, M_DONTWAIT, m->m_type);
 1985                         if (n != NULL) {
 1986                                 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
 1987                                         bcopy(m->m_data, n->m_data, m->m_len);
 1988                                         n->m_len = m->m_len;
 1989                                         
 1990                                         m_freem(m);
 1991                                         m = n;
 1992                                 } else {
 1993                                         m_freem(n);
 1994                                         n = NULL;
 1995                                 }
 1996                         }
 1997                 }
 1998                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 1999                     (struct sockaddr *)&fromsa, m, opts) == 0) {
 2000                         m_freem(m);
 2001                         if (opts)
 2002                                 m_freem(opts);
 2003                 } else
 2004                         sorwakeup(last->in6p_socket);
 2005                 INP_UNLOCK(last);
 2006         } else {
 2007                 m_freem(m);
 2008                 ip6stat.ip6s_delivered--;
 2009         }
 2010         INP_INFO_RUNLOCK(&ripcbinfo);
 2011         return IPPROTO_DONE;
 2012 }
 2013 
 2014 /*
 2015  * Reflect the ip6 packet back to the source.
 2016  * OFF points to the icmp6 header, counted from the top of the mbuf.
 2017  */
 2018 void
 2019 icmp6_reflect(m, off)
 2020         struct  mbuf *m;
 2021         size_t off;
 2022 {
 2023         struct ip6_hdr *ip6;
 2024         struct icmp6_hdr *icmp6;
 2025         struct in6_ifaddr *ia;
 2026         int plen;
 2027         int type, code;
 2028         struct ifnet *outif = NULL;
 2029         struct in6_addr origdst, *src = NULL;
 2030 
 2031         /* too short to reflect */
 2032         if (off < sizeof(struct ip6_hdr)) {
 2033                 nd6log((LOG_DEBUG,
 2034                     "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
 2035                     (u_long)off, (u_long)sizeof(struct ip6_hdr),
 2036                     __FILE__, __LINE__));
 2037                 goto bad;
 2038         }
 2039 
 2040         /*
 2041          * If there are extra headers between IPv6 and ICMPv6, strip
 2042          * off that header first.
 2043          */
 2044 #ifdef DIAGNOSTIC
 2045         if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
 2046                 panic("assumption failed in icmp6_reflect");
 2047 #endif
 2048         if (off > sizeof(struct ip6_hdr)) {
 2049                 size_t l;
 2050                 struct ip6_hdr nip6;
 2051 
 2052                 l = off - sizeof(struct ip6_hdr);
 2053                 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
 2054                 m_adj(m, l);
 2055                 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
 2056                 if (m->m_len < l) {
 2057                         if ((m = m_pullup(m, l)) == NULL)
 2058                                 return;
 2059                 }
 2060                 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
 2061         } else /* off == sizeof(struct ip6_hdr) */ {
 2062                 size_t l;
 2063                 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
 2064                 if (m->m_len < l) {
 2065                         if ((m = m_pullup(m, l)) == NULL)
 2066                                 return;
 2067                 }
 2068         }
 2069         plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
 2070         ip6 = mtod(m, struct ip6_hdr *);
 2071         ip6->ip6_nxt = IPPROTO_ICMPV6;
 2072         icmp6 = (struct icmp6_hdr *)(ip6 + 1);
 2073         type = icmp6->icmp6_type; /* keep type for statistics */
 2074         code = icmp6->icmp6_code; /* ditto. */
 2075 
 2076         origdst = ip6->ip6_dst;
 2077         /*
 2078          * ip6_input() drops a packet if its src is multicast.
 2079          * So, the src is never multicast.
 2080          */
 2081         ip6->ip6_dst = ip6->ip6_src;
 2082 
 2083         /*
 2084          * If the incoming packet was addressed directly to us (i.e. unicast),
 2085          * use dst as the src for the reply.
 2086          * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
 2087          * (for example) when we encounter an error while forwarding procedure
 2088          * destined to a duplicated address of ours.
 2089          * Note that ip6_getdstifaddr() may fail if we are in an error handling
 2090          * procedure of an outgoing packet of our own, in which case we need
 2091          * to search in the ifaddr list.
 2092          */
 2093         if (!IN6_IS_ADDR_MULTICAST(&origdst)) {
 2094                 if ((ia = ip6_getdstifaddr(m))) {
 2095                         if (!(ia->ia6_flags &
 2096                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)))
 2097                                 src = &ia->ia_addr.sin6_addr;
 2098                 } else {
 2099                         struct sockaddr_in6 d;
 2100 
 2101                         bzero(&d, sizeof(d));
 2102                         d.sin6_family = AF_INET6;
 2103                         d.sin6_len = sizeof(d);
 2104                         d.sin6_addr = origdst;
 2105                         ia = (struct in6_ifaddr *)
 2106                             ifa_ifwithaddr((struct sockaddr *)&d);
 2107                         if (ia &&
 2108                             !(ia->ia6_flags &
 2109                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
 2110                                 src = &ia->ia_addr.sin6_addr;
 2111                         }
 2112                 }
 2113         }
 2114 
 2115         if (src == NULL) {
 2116                 int e;
 2117                 struct sockaddr_in6 sin6;
 2118                 struct route_in6 ro;
 2119 
 2120                 /*
 2121                  * This case matches to multicasts, our anycast, or unicasts
 2122                  * that we do not own.  Select a source address based on the
 2123                  * source address of the erroneous packet.
 2124                  */
 2125                 bzero(&sin6, sizeof(sin6));
 2126                 sin6.sin6_family = AF_INET6;
 2127                 sin6.sin6_len = sizeof(sin6);
 2128                 sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
 2129 
 2130                 bzero(&ro, sizeof(ro));
 2131                 src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &e);
 2132                 if (ro.ro_rt)
 2133                         RTFREE(ro.ro_rt); /* XXX: we could use this */
 2134                 if (src == NULL) {
 2135                         nd6log((LOG_DEBUG,
 2136                             "icmp6_reflect: source can't be determined: "
 2137                             "dst=%s, error=%d\n",
 2138                             ip6_sprintf(&sin6.sin6_addr), e));
 2139                         goto bad;
 2140                 }
 2141         }
 2142 
 2143         ip6->ip6_src = *src;
 2144         ip6->ip6_flow = 0;
 2145         ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
 2146         ip6->ip6_vfc |= IPV6_VERSION;
 2147         ip6->ip6_nxt = IPPROTO_ICMPV6;
 2148         if (outif)
 2149                 ip6->ip6_hlim = ND_IFINFO(outif)->chlim;
 2150         else if (m->m_pkthdr.rcvif) {
 2151                 /* XXX: This may not be the outgoing interface */
 2152                 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
 2153         } else
 2154                 ip6->ip6_hlim = ip6_defhlim;
 2155 
 2156         icmp6->icmp6_cksum = 0;
 2157         icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
 2158             sizeof(struct ip6_hdr), plen);
 2159 
 2160         /*
 2161          * XXX option handling
 2162          */
 2163 
 2164         m->m_flags &= ~(M_BCAST|M_MCAST);
 2165 
 2166         ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
 2167         if (outif)
 2168                 icmp6_ifoutstat_inc(outif, type, code);
 2169 
 2170         return;
 2171 
 2172  bad:
 2173         m_freem(m);
 2174         return;
 2175 }
 2176 
 2177 void
 2178 icmp6_fasttimo()
 2179 {
 2180 
 2181         return;
 2182 }
 2183 
 2184 static const char *
 2185 icmp6_redirect_diag(src6, dst6, tgt6)
 2186         struct in6_addr *src6;
 2187         struct in6_addr *dst6;
 2188         struct in6_addr *tgt6;
 2189 {
 2190         static char buf[1024];
 2191         snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
 2192             ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
 2193         return buf;
 2194 }
 2195 
 2196 void
 2197 icmp6_redirect_input(m, off)
 2198         struct mbuf *m;
 2199         int off;
 2200 {
 2201         struct ifnet *ifp = m->m_pkthdr.rcvif;
 2202         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 2203         struct nd_redirect *nd_rd;
 2204         int icmp6len = ntohs(ip6->ip6_plen);
 2205         char *lladdr = NULL;
 2206         int lladdrlen = 0;
 2207         u_char *redirhdr = NULL;
 2208         int redirhdrlen = 0;
 2209         struct rtentry *rt = NULL;
 2210         int is_router;
 2211         int is_onlink;
 2212         struct in6_addr src6 = ip6->ip6_src;
 2213         struct in6_addr redtgt6;
 2214         struct in6_addr reddst6;
 2215         union nd_opts ndopts;
 2216 
 2217         if (!m || !ifp)
 2218                 return;
 2219 
 2220         /* XXX if we are router, we don't update route by icmp6 redirect */
 2221         if (ip6_forwarding)
 2222                 goto freeit;
 2223         if (!icmp6_rediraccept)
 2224                 goto freeit;
 2225 
 2226 #ifndef PULLDOWN_TEST
 2227         IP6_EXTHDR_CHECK(m, off, icmp6len,);
 2228         nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
 2229 #else
 2230         IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
 2231         if (nd_rd == NULL) {
 2232                 icmp6stat.icp6s_tooshort++;
 2233                 return;
 2234         }
 2235 #endif
 2236         redtgt6 = nd_rd->nd_rd_target;
 2237         reddst6 = nd_rd->nd_rd_dst;
 2238 
 2239         if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
 2240             in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
 2241                 goto freeit;
 2242         }
 2243 
 2244         /* validation */
 2245         if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
 2246                 nd6log((LOG_ERR,
 2247                     "ICMP6 redirect sent from %s rejected; "
 2248                     "must be from linklocal\n",
 2249                     ip6_sprintf(&src6)));
 2250                 goto bad;
 2251         }
 2252         if (ip6->ip6_hlim != 255) {
 2253                 nd6log((LOG_ERR,
 2254                     "ICMP6 redirect sent from %s rejected; "
 2255                     "hlim=%d (must be 255)\n",
 2256                     ip6_sprintf(&src6), ip6->ip6_hlim));
 2257                 goto bad;
 2258         }
 2259     {
 2260         /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
 2261         struct sockaddr_in6 sin6;
 2262         struct in6_addr *gw6;
 2263 
 2264         bzero(&sin6, sizeof(sin6));
 2265         sin6.sin6_family = AF_INET6;
 2266         sin6.sin6_len = sizeof(struct sockaddr_in6);
 2267         bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
 2268         rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
 2269         if (rt) {
 2270                 if (rt->rt_gateway == NULL ||
 2271                     rt->rt_gateway->sa_family != AF_INET6) {
 2272                         nd6log((LOG_ERR,
 2273                             "ICMP6 redirect rejected; no route "
 2274                             "with inet6 gateway found for redirect dst: %s\n",
 2275                             icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2276                         RTFREE_LOCKED(rt);
 2277                         goto bad;
 2278                 }
 2279 
 2280                 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
 2281                 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
 2282                         nd6log((LOG_ERR,
 2283                             "ICMP6 redirect rejected; "
 2284                             "not equal to gw-for-src=%s (must be same): "
 2285                             "%s\n",
 2286                             ip6_sprintf(gw6),
 2287                             icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2288                         RTFREE_LOCKED(rt);
 2289                         goto bad;
 2290                 }
 2291         } else {
 2292                 nd6log((LOG_ERR,
 2293                     "ICMP6 redirect rejected; "
 2294                     "no route found for redirect dst: %s\n",
 2295                     icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2296                 goto bad;
 2297         }
 2298         RTFREE_LOCKED(rt);
 2299         rt = NULL;
 2300     }
 2301         if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
 2302                 nd6log((LOG_ERR,
 2303                     "ICMP6 redirect rejected; "
 2304                     "redirect dst must be unicast: %s\n",
 2305                     icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2306                 goto bad;
 2307         }
 2308 
 2309         is_router = is_onlink = 0;
 2310         if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
 2311                 is_router = 1;  /* router case */
 2312         if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
 2313                 is_onlink = 1;  /* on-link destination case */
 2314         if (!is_router && !is_onlink) {
 2315                 nd6log((LOG_ERR,
 2316                     "ICMP6 redirect rejected; "
 2317                     "neither router case nor onlink case: %s\n",
 2318                     icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2319                 goto bad;
 2320         }
 2321         /* validation passed */
 2322 
 2323         icmp6len -= sizeof(*nd_rd);
 2324         nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
 2325         if (nd6_options(&ndopts) < 0) {
 2326                 nd6log((LOG_INFO, "icmp6_redirect_input: "
 2327                     "invalid ND option, rejected: %s\n",
 2328                     icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2329                 /* nd6_options have incremented stats */
 2330                 goto freeit;
 2331         }
 2332 
 2333         if (ndopts.nd_opts_tgt_lladdr) {
 2334                 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
 2335                 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
 2336         }
 2337 
 2338         if (ndopts.nd_opts_rh) {
 2339                 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
 2340                 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
 2341         }
 2342 
 2343         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
 2344                 nd6log((LOG_INFO,
 2345                     "icmp6_redirect_input: lladdrlen mismatch for %s "
 2346                     "(if %d, icmp6 packet %d): %s\n",
 2347                     ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
 2348                     icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2349                 goto bad;
 2350         }
 2351 
 2352         /* RFC 2461 8.3 */
 2353         nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
 2354             is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
 2355 
 2356         if (!is_onlink) {       /* better router case.  perform rtredirect. */
 2357                 /* perform rtredirect */
 2358                 struct sockaddr_in6 sdst;
 2359                 struct sockaddr_in6 sgw;
 2360                 struct sockaddr_in6 ssrc;
 2361 
 2362                 bzero(&sdst, sizeof(sdst));
 2363                 bzero(&sgw, sizeof(sgw));
 2364                 bzero(&ssrc, sizeof(ssrc));
 2365                 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
 2366                 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
 2367                         sizeof(struct sockaddr_in6);
 2368                 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
 2369                 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
 2370                 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
 2371                 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
 2372                     (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
 2373                     (struct sockaddr *)&ssrc);
 2374         }
 2375         /* finally update cached route in each socket via pfctlinput */
 2376     {
 2377         struct sockaddr_in6 sdst;
 2378 
 2379         bzero(&sdst, sizeof(sdst));
 2380         sdst.sin6_family = AF_INET6;
 2381         sdst.sin6_len = sizeof(struct sockaddr_in6);
 2382         bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
 2383         pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
 2384 #if defined(IPSEC) || defined(FAST_IPSEC)
 2385         key_sa_routechange((struct sockaddr *)&sdst);
 2386 #endif
 2387     }
 2388 
 2389  freeit:
 2390         m_freem(m);
 2391         return;
 2392 
 2393  bad:
 2394         icmp6stat.icp6s_badredirect++;
 2395         m_freem(m);
 2396 }
 2397 
 2398 void
 2399 icmp6_redirect_output(m0, rt)
 2400         struct mbuf *m0;
 2401         struct rtentry *rt;
 2402 {
 2403         struct ifnet *ifp;      /* my outgoing interface */
 2404         struct in6_addr *ifp_ll6;
 2405         struct in6_addr *router_ll6;
 2406         struct ip6_hdr *sip6;   /* m0 as struct ip6_hdr */
 2407         struct mbuf *m = NULL;  /* newly allocated one */
 2408         struct ip6_hdr *ip6;    /* m as struct ip6_hdr */
 2409         struct nd_redirect *nd_rd;
 2410         size_t maxlen;
 2411         u_char *p;
 2412         struct ifnet *outif = NULL;
 2413         struct sockaddr_in6 src_sa;
 2414 
 2415         icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
 2416 
 2417         /* if we are not router, we don't send icmp6 redirect */
 2418         if (!ip6_forwarding)
 2419                 goto fail;
 2420 
 2421         /* sanity check */
 2422         if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
 2423                 goto fail;
 2424 
 2425         /*
 2426          * Address check:
 2427          *  the source address must identify a neighbor, and
 2428          *  the destination address must not be a multicast address
 2429          *  [RFC 2461, sec 8.2]
 2430          */
 2431         sip6 = mtod(m0, struct ip6_hdr *);
 2432         bzero(&src_sa, sizeof(src_sa));
 2433         src_sa.sin6_family = AF_INET6;
 2434         src_sa.sin6_len = sizeof(src_sa);
 2435         src_sa.sin6_addr = sip6->ip6_src;
 2436         if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
 2437                 goto fail;
 2438         if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
 2439                 goto fail;      /* what should we do here? */
 2440 
 2441         /* rate limit */
 2442         if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
 2443                 goto fail;
 2444 
 2445         /*
 2446          * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
 2447          * we almost always ask for an mbuf cluster for simplicity.
 2448          * (MHLEN < IPV6_MMTU is almost always true)
 2449          */
 2450 #if IPV6_MMTU >= MCLBYTES
 2451 # error assumption failed about IPV6_MMTU and MCLBYTES
 2452 #endif
 2453         MGETHDR(m, M_DONTWAIT, MT_HEADER);
 2454         if (m && IPV6_MMTU >= MHLEN)
 2455                 MCLGET(m, M_DONTWAIT);
 2456         if (!m)
 2457                 goto fail;
 2458         m->m_pkthdr.rcvif = NULL;
 2459         m->m_len = 0;
 2460         maxlen = M_TRAILINGSPACE(m);
 2461         maxlen = min(IPV6_MMTU, maxlen);
 2462         /* just for safety */
 2463         if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
 2464             ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
 2465                 goto fail;
 2466         }
 2467 
 2468         {
 2469                 /* get ip6 linklocal address for ifp(my outgoing interface). */
 2470                 struct in6_ifaddr *ia;
 2471                 if ((ia = in6ifa_ifpforlinklocal(ifp,
 2472                                                  IN6_IFF_NOTREADY|
 2473                                                  IN6_IFF_ANYCAST)) == NULL)
 2474                         goto fail;
 2475                 ifp_ll6 = &ia->ia_addr.sin6_addr;
 2476         }
 2477 
 2478         /* get ip6 linklocal address for the router. */
 2479         if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
 2480                 struct sockaddr_in6 *sin6;
 2481                 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
 2482                 router_ll6 = &sin6->sin6_addr;
 2483                 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
 2484                         router_ll6 = (struct in6_addr *)NULL;
 2485         } else
 2486                 router_ll6 = (struct in6_addr *)NULL;
 2487 
 2488         /* ip6 */
 2489         ip6 = mtod(m, struct ip6_hdr *);
 2490         ip6->ip6_flow = 0;
 2491         ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
 2492         ip6->ip6_vfc |= IPV6_VERSION;
 2493         /* ip6->ip6_plen will be set later */
 2494         ip6->ip6_nxt = IPPROTO_ICMPV6;
 2495         ip6->ip6_hlim = 255;
 2496         /* ip6->ip6_src must be linklocal addr for my outgoing if. */
 2497         bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
 2498         bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
 2499 
 2500         /* ND Redirect */
 2501         nd_rd = (struct nd_redirect *)(ip6 + 1);
 2502         nd_rd->nd_rd_type = ND_REDIRECT;
 2503         nd_rd->nd_rd_code = 0;
 2504         nd_rd->nd_rd_reserved = 0;
 2505         if (rt->rt_flags & RTF_GATEWAY) {
 2506                 /*
 2507                  * nd_rd->nd_rd_target must be a link-local address in
 2508                  * better router cases.
 2509                  */
 2510                 if (!router_ll6)
 2511                         goto fail;
 2512                 bcopy(router_ll6, &nd_rd->nd_rd_target,
 2513                     sizeof(nd_rd->nd_rd_target));
 2514                 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
 2515                     sizeof(nd_rd->nd_rd_dst));
 2516         } else {
 2517                 /* make sure redtgt == reddst */
 2518                 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
 2519                     sizeof(nd_rd->nd_rd_target));
 2520                 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
 2521                     sizeof(nd_rd->nd_rd_dst));
 2522         }
 2523 
 2524         p = (u_char *)(nd_rd + 1);
 2525 
 2526         if (!router_ll6)
 2527                 goto nolladdropt;
 2528 
 2529         {
 2530                 /* target lladdr option */
 2531                 struct rtentry *rt_router = NULL;
 2532                 int len;
 2533                 struct sockaddr_dl *sdl;
 2534                 struct nd_opt_hdr *nd_opt;
 2535                 char *lladdr;
 2536 
 2537                 rt_router = nd6_lookup(router_ll6, 0, ifp);
 2538                 if (!rt_router)
 2539                         goto nolladdropt;
 2540                 len = sizeof(*nd_opt) + ifp->if_addrlen;
 2541                 len = (len + 7) & ~7;   /* round by 8 */
 2542                 /* safety check */
 2543                 if (len + (p - (u_char *)ip6) > maxlen)
 2544                         goto nolladdropt;
 2545                 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
 2546                     (rt_router->rt_flags & RTF_LLINFO) &&
 2547                     (rt_router->rt_gateway->sa_family == AF_LINK) &&
 2548                     (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
 2549                     sdl->sdl_alen) {
 2550                         nd_opt = (struct nd_opt_hdr *)p;
 2551                         nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
 2552                         nd_opt->nd_opt_len = len >> 3;
 2553                         lladdr = (char *)(nd_opt + 1);
 2554                         bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
 2555                         p += len;
 2556                 }
 2557         }
 2558 nolladdropt:;
 2559 
 2560         m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
 2561 
 2562         /* just to be safe */
 2563 #ifdef M_DECRYPTED      /*not openbsd*/
 2564         if (m0->m_flags & M_DECRYPTED)
 2565                 goto noredhdropt;
 2566 #endif
 2567         if (p - (u_char *)ip6 > maxlen)
 2568                 goto noredhdropt;
 2569 
 2570         {
 2571                 /* redirected header option */
 2572                 int len;
 2573                 struct nd_opt_rd_hdr *nd_opt_rh;
 2574 
 2575                 /*
 2576                  * compute the maximum size for icmp6 redirect header option.
 2577                  * XXX room for auth header?
 2578                  */
 2579                 len = maxlen - (p - (u_char *)ip6);
 2580                 len &= ~7;
 2581 
 2582                 /* This is just for simplicity. */
 2583                 if (m0->m_pkthdr.len != m0->m_len) {
 2584                         if (m0->m_next) {
 2585                                 m_freem(m0->m_next);
 2586                                 m0->m_next = NULL;
 2587                         }
 2588                         m0->m_pkthdr.len = m0->m_len;
 2589                 }
 2590 
 2591                 /*
 2592                  * Redirected header option spec (RFC2461 4.6.3) talks nothing
 2593                  * about padding/truncate rule for the original IP packet.
 2594                  * From the discussion on IPv6imp in Feb 1999,
 2595                  * the consensus was:
 2596                  * - "attach as much as possible" is the goal
 2597                  * - pad if not aligned (original size can be guessed by
 2598                  *   original ip6 header)
 2599                  * Following code adds the padding if it is simple enough,
 2600                  * and truncates if not.
 2601                  */
 2602                 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
 2603                         panic("assumption failed in %s:%d", __FILE__,
 2604                             __LINE__);
 2605 
 2606                 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
 2607                         /* not enough room, truncate */
 2608                         m0->m_pkthdr.len = m0->m_len = len -
 2609                             sizeof(*nd_opt_rh);
 2610                 } else {
 2611                         /* enough room, pad or truncate */
 2612                         size_t extra;
 2613 
 2614                         extra = m0->m_pkthdr.len % 8;
 2615                         if (extra) {
 2616                                 /* pad if easy enough, truncate if not */
 2617                                 if (8 - extra <= M_TRAILINGSPACE(m0)) {
 2618                                         /* pad */
 2619                                         m0->m_len += (8 - extra);
 2620                                         m0->m_pkthdr.len += (8 - extra);
 2621                                 } else {
 2622                                         /* truncate */
 2623                                         m0->m_pkthdr.len -= extra;
 2624                                         m0->m_len -= extra;
 2625                                 }
 2626                         }
 2627                         len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
 2628                         m0->m_pkthdr.len = m0->m_len = len -
 2629                             sizeof(*nd_opt_rh);
 2630                 }
 2631 
 2632                 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
 2633                 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
 2634                 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
 2635                 nd_opt_rh->nd_opt_rh_len = len >> 3;
 2636                 p += sizeof(*nd_opt_rh);
 2637                 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
 2638 
 2639                 /* connect m0 to m */
 2640                 m_tag_delete_chain(m0, NULL);
 2641                 m0->m_flags &= ~M_PKTHDR;
 2642                 m->m_next = m0;
 2643                 m->m_pkthdr.len = m->m_len + m0->m_len;
 2644                 m0 = NULL;
 2645         }
 2646 noredhdropt:;
 2647         if (m0) {
 2648                 m_freem(m0);
 2649                 m0 = NULL;
 2650         }
 2651 
 2652         /* XXX: clear embedded link IDs in the inner header */
 2653         in6_clearscope(&sip6->ip6_src);
 2654         in6_clearscope(&sip6->ip6_dst);
 2655         in6_clearscope(&nd_rd->nd_rd_target);
 2656         in6_clearscope(&nd_rd->nd_rd_dst);
 2657 
 2658         ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
 2659 
 2660         nd_rd->nd_rd_cksum = 0;
 2661         nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
 2662             sizeof(*ip6), ntohs(ip6->ip6_plen));
 2663 
 2664         /* send the packet to outside... */
 2665         ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
 2666         if (outif) {
 2667                 icmp6_ifstat_inc(outif, ifs6_out_msg);
 2668                 icmp6_ifstat_inc(outif, ifs6_out_redirect);
 2669         }
 2670         icmp6stat.icp6s_outhist[ND_REDIRECT]++;
 2671 
 2672         return;
 2673 
 2674 fail:
 2675         if (m)
 2676                 m_freem(m);
 2677         if (m0)
 2678                 m_freem(m0);
 2679 }
 2680 
 2681 /*
 2682  * ICMPv6 socket option processing.
 2683  */
 2684 int
 2685 icmp6_ctloutput(so, sopt)
 2686         struct socket *so;
 2687         struct sockopt *sopt;
 2688 {
 2689         int error = 0;
 2690         int optlen;
 2691         struct inpcb *inp = sotoinpcb(so);
 2692         int level, op, optname;
 2693 
 2694         if (sopt) {
 2695                 level = sopt->sopt_level;
 2696                 op = sopt->sopt_dir;
 2697                 optname = sopt->sopt_name;
 2698                 optlen = sopt->sopt_valsize;
 2699         } else
 2700                 level = op = optname = optlen = 0;
 2701 
 2702         if (level != IPPROTO_ICMPV6) {
 2703                 return EINVAL;
 2704         }
 2705 
 2706         switch (op) {
 2707         case PRCO_SETOPT:
 2708                 switch (optname) {
 2709                 case ICMP6_FILTER:
 2710                     {
 2711                         struct icmp6_filter *p;
 2712 
 2713                         if (optlen != sizeof(*p)) {
 2714                                 error = EMSGSIZE;
 2715                                 break;
 2716                         }
 2717                         if (inp->in6p_icmp6filt == NULL) {
 2718                                 error = EINVAL;
 2719                                 break;
 2720                         }
 2721                         error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
 2722                                 optlen);
 2723                         break;
 2724                     }
 2725 
 2726                 default:
 2727                         error = ENOPROTOOPT;
 2728                         break;
 2729                 }
 2730                 break;
 2731 
 2732         case PRCO_GETOPT:
 2733                 switch (optname) {
 2734                 case ICMP6_FILTER:
 2735                     {
 2736                         if (inp->in6p_icmp6filt == NULL) {
 2737                                 error = EINVAL;
 2738                                 break;
 2739                         }
 2740                         error = sooptcopyout(sopt, inp->in6p_icmp6filt,
 2741                                 sizeof(struct icmp6_filter));
 2742                         break;
 2743                     }
 2744 
 2745                 default:
 2746                         error = ENOPROTOOPT;
 2747                         break;
 2748                 }
 2749                 break;
 2750         }
 2751 
 2752         return (error);
 2753 }
 2754 
 2755 /*
 2756  * Perform rate limit check.
 2757  * Returns 0 if it is okay to send the icmp6 packet.
 2758  * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
 2759  * limitation.
 2760  *
 2761  * XXX per-destination/type check necessary?
 2762  */
 2763 static int
 2764 icmp6_ratelimit(dst, type, code)
 2765         const struct in6_addr *dst;     /* not used at this moment */
 2766         const int type;                 /* not used at this moment */
 2767         const int code;                 /* not used at this moment */
 2768 {
 2769         int ret;
 2770 
 2771         ret = 0;        /* okay to send */
 2772 
 2773         /* PPS limit */
 2774         if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
 2775             icmp6errppslim)) {
 2776                 /* The packet is subject to rate limit */
 2777                 ret++;
 2778         }
 2779 
 2780         return ret;
 2781 }

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