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/5.1/sys/netinet6/icmp6.c 114205 2003-04-29 08:43:56Z suz $     */
    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  * 3. All advertising materials mentioning features or use of this software
   46  *    must display the following acknowledgement:
   47  *      This product includes software developed by the University of
   48  *      California, Berkeley and its contributors.
   49  * 4. Neither the name of the University nor the names of its contributors
   50  *    may be used to endorse or promote products derived from this software
   51  *    without specific prior written permission.
   52  *
   53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   63  * SUCH DAMAGE.
   64  *
   65  *      @(#)ip_icmp.c   8.2 (Berkeley) 1/4/94
   66  */
   67 
   68 #include "opt_inet.h"
   69 #include "opt_inet6.h"
   70 #include "opt_ipsec.h"
   71 
   72 #include <sys/param.h>
   73 #include <sys/domain.h>
   74 #include <sys/kernel.h>
   75 #include <sys/lock.h>
   76 #include <sys/malloc.h>
   77 #include <sys/mbuf.h>
   78 #include <sys/protosw.h>
   79 #include <sys/signalvar.h>
   80 #include <sys/socket.h>
   81 #include <sys/socketvar.h>
   82 #include <sys/sx.h>
   83 #include <sys/syslog.h>
   84 #include <sys/systm.h>
   85 #include <sys/time.h>
   86 
   87 #include <net/if.h>
   88 #include <net/if_dl.h>
   89 #include <net/if_types.h>
   90 #include <net/route.h>
   91 
   92 #include <netinet/in.h>
   93 #include <netinet/in_pcb.h>
   94 #include <netinet/in_var.h>
   95 #include <netinet/ip6.h>
   96 #include <netinet/icmp6.h>
   97 #include <netinet6/in6_ifattach.h>
   98 #include <netinet6/in6_pcb.h>
   99 #include <netinet6/ip6protosw.h>
  100 #include <netinet6/ip6_var.h>
  101 #include <netinet6/mld6_var.h>
  102 #include <netinet6/nd6.h>
  103 
  104 #ifdef IPSEC
  105 #include <netinet6/ipsec.h>
  106 #include <netkey/key.h>
  107 #endif
  108 
  109 #ifdef FAST_IPSEC
  110 #include <netipsec/ipsec.h>
  111 #include <netipsec/key.h>
  112 #define IPSEC
  113 #endif
  114 
  115 #include <net/net_osdep.h>
  116 
  117 #ifdef HAVE_NRL_INPCB
  118 /* inpcb members */
  119 #define in6pcb          inpcb
  120 #define in6p_laddr      inp_laddr6
  121 #define in6p_faddr      inp_faddr6
  122 #define in6p_icmp6filt  inp_icmp6filt
  123 #define in6p_route      inp_route
  124 #define in6p_socket     inp_socket
  125 #define in6p_flags      inp_flags
  126 #define in6p_moptions   inp_moptions6
  127 #define in6p_outputopts inp_outputopts6
  128 #define in6p_ip6        inp_ipv6
  129 #define in6p_flowinfo   inp_flowinfo
  130 #define in6p_sp         inp_sp
  131 #define in6p_next       inp_next
  132 #define in6p_prev       inp_prev
  133 /* macro names */
  134 #define sotoin6pcb      sotoinpcb
  135 /* function names */
  136 #define in6_pcbdetach   in_pcbdetach
  137 #define in6_rtchange    in_rtchange
  138 
  139 /*
  140  * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
  141  * others...
  142  */
  143 #define in6p_ip6_nxt    inp_ipv6.ip6_nxt
  144 #endif
  145 
  146 extern struct domain inet6domain;
  147 
  148 struct icmp6stat icmp6stat;
  149 
  150 extern struct inpcbhead ripcb;
  151 extern int icmp6errppslim;
  152 static int icmp6errpps_count = 0;
  153 static struct timeval icmp6errppslim_last;
  154 extern int icmp6_nodeinfo;
  155 
  156 static void icmp6_errcount __P((struct icmp6errstat *, int, int));
  157 static int icmp6_rip6_input __P((struct mbuf **, int));
  158 static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int));
  159 static const char *icmp6_redirect_diag __P((struct in6_addr *,
  160         struct in6_addr *, struct in6_addr *));
  161 #define HAVE_PPSRATECHECK
  162 #ifndef HAVE_PPSRATECHECK
  163 static int ppsratecheck __P((struct timeval *, int *, int));
  164 #endif
  165 static struct mbuf *ni6_input __P((struct mbuf *, int));
  166 static struct mbuf *ni6_nametodns __P((const char *, int, int));
  167 static int ni6_dnsmatch __P((const char *, int, const char *, int));
  168 static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
  169                           struct ifnet **, char *));
  170 static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
  171                                 struct ifnet *, int));
  172 static int icmp6_notify_error __P((struct mbuf *, int, int, int));
  173 
  174 #ifdef COMPAT_RFC1885
  175 static struct route_in6 icmp6_reflect_rt;
  176 #endif
  177 
  178 
  179 void
  180 icmp6_init()
  181 {
  182         mld6_init();
  183 }
  184 
  185 static void
  186 icmp6_errcount(stat, type, code)
  187         struct icmp6errstat *stat;
  188         int type, code;
  189 {
  190         switch (type) {
  191         case ICMP6_DST_UNREACH:
  192                 switch (code) {
  193                 case ICMP6_DST_UNREACH_NOROUTE:
  194                         stat->icp6errs_dst_unreach_noroute++;
  195                         return;
  196                 case ICMP6_DST_UNREACH_ADMIN:
  197                         stat->icp6errs_dst_unreach_admin++;
  198                         return;
  199                 case ICMP6_DST_UNREACH_BEYONDSCOPE:
  200                         stat->icp6errs_dst_unreach_beyondscope++;
  201                         return;
  202                 case ICMP6_DST_UNREACH_ADDR:
  203                         stat->icp6errs_dst_unreach_addr++;
  204                         return;
  205                 case ICMP6_DST_UNREACH_NOPORT:
  206                         stat->icp6errs_dst_unreach_noport++;
  207                         return;
  208                 }
  209                 break;
  210         case ICMP6_PACKET_TOO_BIG:
  211                 stat->icp6errs_packet_too_big++;
  212                 return;
  213         case ICMP6_TIME_EXCEEDED:
  214                 switch (code) {
  215                 case ICMP6_TIME_EXCEED_TRANSIT:
  216                         stat->icp6errs_time_exceed_transit++;
  217                         return;
  218                 case ICMP6_TIME_EXCEED_REASSEMBLY:
  219                         stat->icp6errs_time_exceed_reassembly++;
  220                         return;
  221                 }
  222                 break;
  223         case ICMP6_PARAM_PROB:
  224                 switch (code) {
  225                 case ICMP6_PARAMPROB_HEADER:
  226                         stat->icp6errs_paramprob_header++;
  227                         return;
  228                 case ICMP6_PARAMPROB_NEXTHEADER:
  229                         stat->icp6errs_paramprob_nextheader++;
  230                         return;
  231                 case ICMP6_PARAMPROB_OPTION:
  232                         stat->icp6errs_paramprob_option++;
  233                         return;
  234                 }
  235                 break;
  236         case ND_REDIRECT:
  237                 stat->icp6errs_redirect++;
  238                 return;
  239         }
  240         stat->icp6errs_unknown++;
  241 }
  242 
  243 /*
  244  * Generate an error packet of type error in response to bad IP6 packet.
  245  */
  246 void
  247 icmp6_error(m, type, code, param)
  248         struct mbuf *m;
  249         int type, code, param;
  250 {
  251         struct ip6_hdr *oip6, *nip6;
  252         struct icmp6_hdr *icmp6;
  253         u_int preplen;
  254         int off;
  255         int nxt;
  256 
  257         icmp6stat.icp6s_error++;
  258 
  259         /* count per-type-code statistics */
  260         icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
  261 
  262 #ifdef M_DECRYPTED      /*not openbsd*/
  263         if (m->m_flags & M_DECRYPTED) {
  264                 icmp6stat.icp6s_canterror++;
  265                 goto freeit;
  266         }
  267 #endif
  268 
  269 #ifndef PULLDOWN_TEST
  270         IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
  271 #else
  272         if (m->m_len < sizeof(struct ip6_hdr)) {
  273                 m = m_pullup(m, sizeof(struct ip6_hdr));
  274                 if (m == NULL)
  275                         return;
  276         }
  277 #endif
  278         oip6 = mtod(m, struct ip6_hdr *);
  279 
  280         /*
  281          * Multicast destination check. For unrecognized option errors,
  282          * this check has already done in ip6_unknown_opt(), so we can
  283          * check only for other errors.
  284          */
  285         if ((m->m_flags & (M_BCAST|M_MCAST) ||
  286              IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
  287             (type != ICMP6_PACKET_TOO_BIG &&
  288              (type != ICMP6_PARAM_PROB ||
  289               code != ICMP6_PARAMPROB_OPTION)))
  290                 goto freeit;
  291 
  292         /* Source address check. XXX: the case of anycast source? */
  293         if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
  294             IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
  295                 goto freeit;
  296 
  297         /*
  298          * If we are about to send ICMPv6 against ICMPv6 error/redirect,
  299          * don't do it.
  300          */
  301         nxt = -1;
  302         off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
  303         if (off >= 0 && nxt == IPPROTO_ICMPV6) {
  304                 struct icmp6_hdr *icp;
  305 
  306 #ifndef PULLDOWN_TEST
  307                 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
  308                 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
  309 #else
  310                 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
  311                         sizeof(*icp));
  312                 if (icp == NULL) {
  313                         icmp6stat.icp6s_tooshort++;
  314                         return;
  315                 }
  316 #endif
  317                 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
  318                     icp->icmp6_type == ND_REDIRECT) {
  319                         /*
  320                          * ICMPv6 error
  321                          * Special case: for redirect (which is
  322                          * informational) we must not send icmp6 error.
  323                          */
  324                         icmp6stat.icp6s_canterror++;
  325                         goto freeit;
  326                 } else {
  327                         /* ICMPv6 informational - send the error */
  328                 }
  329         } else {
  330                 /* non-ICMPv6 - send the error */
  331         }
  332 
  333         oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
  334 
  335         /* Finally, do rate limitation check. */
  336         if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
  337                 icmp6stat.icp6s_toofreq++;
  338                 goto freeit;
  339         }
  340 
  341         /*
  342          * OK, ICMP6 can be generated.
  343          */
  344 
  345         if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
  346                 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
  347 
  348         preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
  349         M_PREPEND(m, preplen, M_DONTWAIT);
  350         if (m && m->m_len < preplen)
  351                 m = m_pullup(m, preplen);
  352         if (m == NULL) {
  353                 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
  354                 return;
  355         }
  356 
  357         nip6 = mtod(m, struct ip6_hdr *);
  358         nip6->ip6_src  = oip6->ip6_src;
  359         nip6->ip6_dst  = oip6->ip6_dst;
  360 
  361         if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
  362                 oip6->ip6_src.s6_addr16[1] = 0;
  363         if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
  364                 oip6->ip6_dst.s6_addr16[1] = 0;
  365 
  366         icmp6 = (struct icmp6_hdr *)(nip6 + 1);
  367         icmp6->icmp6_type = type;
  368         icmp6->icmp6_code = code;
  369         icmp6->icmp6_pptr = htonl((u_int32_t)param);
  370 
  371         /*
  372          * icmp6_reflect() is designed to be in the input path.
  373          * icmp6_error() can be called from both input and outut path,
  374          * and if we are in output path rcvif could contain bogus value.
  375          * clear m->m_pkthdr.rcvif for safety, we should have enough scope
  376          * information in ip header (nip6).
  377          */
  378         m->m_pkthdr.rcvif = NULL;
  379 
  380         icmp6stat.icp6s_outhist[type]++;
  381         icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
  382 
  383         return;
  384 
  385   freeit:
  386         /*
  387          * If we can't tell wheter or not we can generate ICMP6, free it.
  388          */
  389         m_freem(m);
  390 }
  391 
  392 /*
  393  * Process a received ICMP6 message.
  394  */
  395 int
  396 icmp6_input(mp, offp, proto)
  397         struct mbuf **mp;
  398         int *offp, proto;
  399 {
  400         struct mbuf *m = *mp, *n;
  401         struct ip6_hdr *ip6, *nip6;
  402         struct icmp6_hdr *icmp6, *nicmp6;
  403         int off = *offp;
  404         int icmp6len = m->m_pkthdr.len - *offp;
  405         int code, sum, noff;
  406 
  407 #ifndef PULLDOWN_TEST
  408         IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
  409         /* m might change if M_LOOP.  So, call mtod after this */
  410 #endif
  411 
  412         /*
  413          * Locate icmp6 structure in mbuf, and check
  414          * that not corrupted and of at least minimum length
  415          */
  416 
  417         ip6 = mtod(m, struct ip6_hdr *);
  418         if (icmp6len < sizeof(struct icmp6_hdr)) {
  419                 icmp6stat.icp6s_tooshort++;
  420                 goto freeit;
  421         }
  422 
  423         /*
  424          * calculate the checksum
  425          */
  426 #ifndef PULLDOWN_TEST
  427         icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
  428 #else
  429         IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
  430         if (icmp6 == NULL) {
  431                 icmp6stat.icp6s_tooshort++;
  432                 return IPPROTO_DONE;
  433         }
  434 #endif
  435         code = icmp6->icmp6_code;
  436 
  437         if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
  438                 nd6log((LOG_ERR,
  439                     "ICMP6 checksum error(%d|%x) %s\n",
  440                     icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
  441                 icmp6stat.icp6s_checksum++;
  442                 goto freeit;
  443         }
  444 
  445         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  446                 /*
  447                  * Deliver very specific ICMP6 type only.
  448                  * This is important to deilver TOOBIG.  Otherwise PMTUD
  449                  * will not work.
  450                  */
  451                 switch (icmp6->icmp6_type) {
  452                 case ICMP6_DST_UNREACH:
  453                 case ICMP6_PACKET_TOO_BIG:
  454                 case ICMP6_TIME_EXCEEDED:
  455                         break;
  456                 default:
  457                         goto freeit;
  458                 }
  459         }
  460 
  461         icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
  462         icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
  463         if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
  464                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
  465 
  466         switch (icmp6->icmp6_type) {
  467         case ICMP6_DST_UNREACH:
  468                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
  469                 switch (code) {
  470                 case ICMP6_DST_UNREACH_NOROUTE:
  471                         code = PRC_UNREACH_NET;
  472                         break;
  473                 case ICMP6_DST_UNREACH_ADMIN:
  474                         icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
  475                         code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
  476                         break;
  477                 case ICMP6_DST_UNREACH_ADDR:
  478                         code = PRC_HOSTDEAD;
  479                         break;
  480 #ifdef COMPAT_RFC1885
  481                 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
  482                         code = PRC_UNREACH_SRCFAIL;
  483                         break;
  484 #else
  485                 case ICMP6_DST_UNREACH_BEYONDSCOPE:
  486                         /* I mean "source address was incorrect." */
  487                         code = PRC_PARAMPROB;
  488                         break;
  489 #endif
  490                 case ICMP6_DST_UNREACH_NOPORT:
  491                         code = PRC_UNREACH_PORT;
  492                         break;
  493                 default:
  494                         goto badcode;
  495                 }
  496                 goto deliver;
  497                 break;
  498 
  499         case ICMP6_PACKET_TOO_BIG:
  500                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
  501                 if (code != 0)
  502                         goto badcode;
  503 
  504                 code = PRC_MSGSIZE;
  505 
  506                 /*
  507                  * Updating the path MTU will be done after examining
  508                  * intermediate extension headers.
  509                  */
  510                 goto deliver;
  511                 break;
  512 
  513         case ICMP6_TIME_EXCEEDED:
  514                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
  515                 switch (code) {
  516                 case ICMP6_TIME_EXCEED_TRANSIT:
  517                 case ICMP6_TIME_EXCEED_REASSEMBLY:
  518                         code += PRC_TIMXCEED_INTRANS;
  519                         break;
  520                 default:
  521                         goto badcode;
  522                 }
  523                 goto deliver;
  524                 break;
  525 
  526         case ICMP6_PARAM_PROB:
  527                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
  528                 switch (code) {
  529                 case ICMP6_PARAMPROB_NEXTHEADER:
  530                         code = PRC_UNREACH_PROTOCOL;
  531                         break;
  532                 case ICMP6_PARAMPROB_HEADER:
  533                 case ICMP6_PARAMPROB_OPTION:
  534                         code = PRC_PARAMPROB;
  535                         break;
  536                 default:
  537                         goto badcode;
  538                 }
  539                 goto deliver;
  540                 break;
  541 
  542         case ICMP6_ECHO_REQUEST:
  543                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
  544                 if (code != 0)
  545                         goto badcode;
  546                 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
  547                         /* Give up remote */
  548                         break;
  549                 }
  550                 if ((n->m_flags & M_EXT) != 0
  551                  || n->m_len < off + sizeof(struct icmp6_hdr)) {
  552                         struct mbuf *n0 = n;
  553                         const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
  554                         int n0len;
  555 
  556                         /*
  557                          * Prepare an internal mbuf. m_pullup() doesn't
  558                          * always copy the length we specified.
  559                          */
  560                         if (maxlen >= MCLBYTES) {
  561                                 /* Give up remote */
  562                                 m_freem(n0);
  563                                 break;
  564                         }
  565                         MGETHDR(n, M_DONTWAIT, n0->m_type);
  566                         n0len = n0->m_pkthdr.len;       /* save for use below */
  567                         if (n)
  568                                 M_MOVE_PKTHDR(n, n0);
  569                         if (n && maxlen >= MHLEN) {
  570                                 MCLGET(n, M_DONTWAIT);
  571                                 if ((n->m_flags & M_EXT) == 0) {
  572                                         m_free(n);
  573                                         n = NULL;
  574                                 }
  575                         }
  576                         if (n == NULL) {
  577                                 /* Give up remote */
  578                                 m_freem(n0);
  579                                 break;
  580                         }
  581                         /*
  582                          * Copy IPv6 and ICMPv6 only.
  583                          */
  584                         nip6 = mtod(n, struct ip6_hdr *);
  585                         bcopy(ip6, nip6, sizeof(struct ip6_hdr));
  586                         nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
  587                         bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
  588                         noff = sizeof(struct ip6_hdr);
  589                         /* new mbuf contains only ipv6+icmpv6 headers */
  590                         n->m_len = noff + sizeof(struct icmp6_hdr);
  591                         /*
  592                          * Adjust mbuf. ip6_plen will be adjusted in
  593                          * ip6_output().
  594                          */
  595                         m_adj(n0, off + sizeof(struct icmp6_hdr));
  596                         /* recalculate complete packet size */
  597                         n->m_pkthdr.len = n0len + (noff - off);
  598                         n->m_next = n0;
  599                 } else {
  600                         nip6 = mtod(n, struct ip6_hdr *);
  601                         nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
  602                         noff = off;
  603                 }
  604                 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
  605                 nicmp6->icmp6_code = 0;
  606                 if (n) {
  607                         icmp6stat.icp6s_reflect++;
  608                         icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
  609                         icmp6_reflect(n, noff);
  610                 }
  611                 break;
  612 
  613         case ICMP6_ECHO_REPLY:
  614                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
  615                 if (code != 0)
  616                         goto badcode;
  617                 break;
  618 
  619         case MLD_LISTENER_QUERY:
  620         case MLD_LISTENER_REPORT:
  621                 if (icmp6len < sizeof(struct mld_hdr))
  622                         goto badlen;
  623                 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
  624                         icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
  625                 else
  626                         icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
  627                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  628                         /* give up local */
  629                         mld6_input(m, off);
  630                         m = NULL;
  631                         goto freeit;
  632                 }
  633                 mld6_input(n, off);
  634                 /* m stays. */
  635                 break;
  636 
  637         case MLD_LISTENER_DONE:
  638                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
  639                 if (icmp6len < sizeof(struct mld_hdr))  /* necessary? */
  640                         goto badlen;
  641                 break;          /* nothing to be done in kernel */
  642 
  643         case MLD_MTRACE_RESP:
  644         case MLD_MTRACE:
  645                 /* XXX: these two are experimental.  not officially defind. */
  646                 /* XXX: per-interface statistics? */
  647                 break;          /* just pass it to applications */
  648 
  649         case ICMP6_WRUREQUEST:  /* ICMP6_FQDN_QUERY */
  650             {
  651                 enum { WRU, FQDN } mode;
  652 
  653                 if (!icmp6_nodeinfo)
  654                         break;
  655 
  656                 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
  657                         mode = WRU;
  658                 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
  659                         mode = FQDN;
  660                 else
  661                         goto badlen;
  662 
  663 #define hostnamelen     strlen(hostname)
  664                 if (mode == FQDN) {
  665 #ifndef PULLDOWN_TEST
  666                         IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
  667                                          IPPROTO_DONE);
  668 #endif
  669                         n = m_copy(m, 0, M_COPYALL);
  670                         if (n)
  671                                 n = ni6_input(n, off);
  672                         /* XXX meaningless if n == NULL */
  673                         noff = sizeof(struct ip6_hdr);
  674                 } else {
  675                         u_char *p;
  676                         int maxlen, maxhlen;
  677 
  678                         if ((icmp6_nodeinfo & 5) != 5) 
  679                                 break;
  680 
  681                         if (code != 0)
  682                                 goto badcode;
  683                         maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
  684                         if (maxlen >= MCLBYTES) {
  685                                 /* Give up remote */
  686                                 break;
  687                         }
  688                         MGETHDR(n, M_DONTWAIT, m->m_type);
  689                         if (n && maxlen > MHLEN) {
  690                                 MCLGET(n, M_DONTWAIT);
  691                                 if ((n->m_flags & M_EXT) == 0) {
  692                                         m_free(n);
  693                                         n = NULL;
  694                                 }
  695                         }
  696                         if (!m_dup_pkthdr(n, m, M_DONTWAIT)) {
  697                                 /*
  698                                  * Previous code did a blind M_COPY_PKTHDR
  699                                  * and said "just for rcvif".  If true, then
  700                                  * we could tolerate the dup failing (due to
  701                                  * the deep copy of the tag chain).  For now
  702                                  * be conservative and just fail.
  703                                  */
  704                                 m_free(n);
  705                                 n = NULL;
  706                         }
  707                         if (n == NULL) {
  708                                 /* Give up remote */
  709                                 break;
  710                         }
  711                         n->m_pkthdr.rcvif = NULL;
  712                         n->m_len = 0;
  713                         maxhlen = M_TRAILINGSPACE(n) - maxlen;
  714                         if (maxhlen > hostnamelen)
  715                                 maxhlen = hostnamelen;
  716                         /*
  717                          * Copy IPv6 and ICMPv6 only.
  718                          */
  719                         nip6 = mtod(n, struct ip6_hdr *);
  720                         bcopy(ip6, nip6, sizeof(struct ip6_hdr));
  721                         nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
  722                         bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
  723                         p = (u_char *)(nicmp6 + 1);
  724                         bzero(p, 4);
  725                         bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
  726                         noff = sizeof(struct ip6_hdr);
  727                         n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
  728                                 sizeof(struct icmp6_hdr) + 4 + maxhlen;
  729                         nicmp6->icmp6_type = ICMP6_WRUREPLY;
  730                         nicmp6->icmp6_code = 0;
  731                 }
  732 #undef hostnamelen
  733                 if (n) {
  734                         icmp6stat.icp6s_reflect++;
  735                         icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
  736                         icmp6_reflect(n, noff);
  737                 }
  738                 break;
  739             }
  740 
  741         case ICMP6_WRUREPLY:
  742                 if (code != 0)
  743                         goto badcode;
  744                 break;
  745 
  746         case ND_ROUTER_SOLICIT:
  747                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
  748                 if (code != 0)
  749                         goto badcode;
  750                 if (icmp6len < sizeof(struct nd_router_solicit))
  751                         goto badlen;
  752                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  753                         /* give up local */
  754                         nd6_rs_input(m, off, icmp6len);
  755                         m = NULL;
  756                         goto freeit;
  757                 }
  758                 nd6_rs_input(n, off, icmp6len);
  759                 /* m stays. */
  760                 break;
  761 
  762         case ND_ROUTER_ADVERT:
  763                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
  764                 if (code != 0)
  765                         goto badcode;
  766                 if (icmp6len < sizeof(struct nd_router_advert))
  767                         goto badlen;
  768                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  769                         /* give up local */
  770                         nd6_ra_input(m, off, icmp6len);
  771                         m = NULL;
  772                         goto freeit;
  773                 }
  774                 nd6_ra_input(n, off, icmp6len);
  775                 /* m stays. */
  776                 break;
  777 
  778         case ND_NEIGHBOR_SOLICIT:
  779                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
  780                 if (code != 0)
  781                         goto badcode;
  782                 if (icmp6len < sizeof(struct nd_neighbor_solicit))
  783                         goto badlen;
  784                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  785                         /* give up local */
  786                         nd6_ns_input(m, off, icmp6len);
  787                         m = NULL;
  788                         goto freeit;
  789                 }
  790                 nd6_ns_input(n, off, icmp6len);
  791                 /* m stays. */
  792                 break;
  793 
  794         case ND_NEIGHBOR_ADVERT:
  795                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
  796                 if (code != 0)
  797                         goto badcode;
  798                 if (icmp6len < sizeof(struct nd_neighbor_advert))
  799                         goto badlen;
  800                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  801                         /* give up local */
  802                         nd6_na_input(m, off, icmp6len);
  803                         m = NULL;
  804                         goto freeit;
  805                 }
  806                 nd6_na_input(n, off, icmp6len);
  807                 /* m stays. */
  808                 break;
  809 
  810         case ND_REDIRECT:
  811                 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
  812                 if (code != 0)
  813                         goto badcode;
  814                 if (icmp6len < sizeof(struct nd_redirect))
  815                         goto badlen;
  816                 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
  817                         /* give up local */
  818                         icmp6_redirect_input(m, off);
  819                         m = NULL;
  820                         goto freeit;
  821                 }
  822                 icmp6_redirect_input(n, off);
  823                 /* m stays. */
  824                 break;
  825 
  826         case ICMP6_ROUTER_RENUMBERING:
  827                 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
  828                     code != ICMP6_ROUTER_RENUMBERING_RESULT)
  829                         goto badcode;
  830                 if (icmp6len < sizeof(struct icmp6_router_renum))
  831                         goto badlen;
  832                 break;
  833 
  834         default:
  835                 nd6log((LOG_DEBUG,
  836                     "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
  837                     icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
  838                     ip6_sprintf(&ip6->ip6_dst),
  839                     m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
  840                 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
  841                         /* ICMPv6 error: MUST deliver it by spec... */
  842                         code = PRC_NCMDS;
  843                         /* deliver */
  844                 } else {
  845                         /* ICMPv6 informational: MUST not deliver */
  846                         break;
  847                 }
  848         deliver:
  849                 if (icmp6_notify_error(m, off, icmp6len, code)) {
  850                         /* In this case, m should've been freed. */
  851                         return(IPPROTO_DONE);
  852                 }
  853                 break;
  854 
  855         badcode:
  856                 icmp6stat.icp6s_badcode++;
  857                 break;
  858 
  859         badlen:
  860                 icmp6stat.icp6s_badlen++;
  861                 break;
  862         }
  863 
  864         /* deliver the packet to appropriate sockets */
  865         icmp6_rip6_input(&m, *offp);
  866 
  867         return IPPROTO_DONE;
  868 
  869  freeit:
  870         m_freem(m);
  871         return IPPROTO_DONE;
  872 }
  873 
  874 static int
  875 icmp6_notify_error(m, off, icmp6len, code)
  876         struct mbuf *m;
  877         int off, icmp6len, code;
  878 {
  879         struct icmp6_hdr *icmp6;
  880         struct ip6_hdr *eip6;
  881         u_int32_t notifymtu;
  882         struct sockaddr_in6 icmp6src, icmp6dst;
  883 
  884         if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
  885                 icmp6stat.icp6s_tooshort++;
  886                 goto freeit;
  887         }
  888 #ifndef PULLDOWN_TEST
  889         IP6_EXTHDR_CHECK(m, off,
  890                          sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
  891                          -1);
  892         icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
  893 #else
  894         IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
  895                        sizeof(*icmp6) + sizeof(struct ip6_hdr));
  896         if (icmp6 == NULL) {
  897                 icmp6stat.icp6s_tooshort++;
  898                 return(-1);
  899         }
  900 #endif
  901         eip6 = (struct ip6_hdr *)(icmp6 + 1);
  902 
  903         /* Detect the upper level protocol */
  904         {
  905                 void (*ctlfunc) __P((int, struct sockaddr *, void *));
  906                 u_int8_t nxt = eip6->ip6_nxt;
  907                 int eoff = off + sizeof(struct icmp6_hdr) +
  908                         sizeof(struct ip6_hdr);
  909                 struct ip6ctlparam ip6cp;
  910                 struct in6_addr *finaldst = NULL;
  911                 int icmp6type = icmp6->icmp6_type;
  912                 struct ip6_frag *fh;
  913                 struct ip6_rthdr *rth;
  914                 struct ip6_rthdr0 *rth0;
  915                 int rthlen;
  916 
  917                 while (1) { /* XXX: should avoid infinite loop explicitly? */
  918                         struct ip6_ext *eh;
  919 
  920                         switch (nxt) {
  921                         case IPPROTO_HOPOPTS:
  922                         case IPPROTO_DSTOPTS:
  923                         case IPPROTO_AH:
  924 #ifndef PULLDOWN_TEST
  925                                 IP6_EXTHDR_CHECK(m, 0, eoff +
  926                                                  sizeof(struct ip6_ext),
  927                                                  -1);
  928                                 eh = (struct ip6_ext *)(mtod(m, caddr_t)
  929                                                         + eoff);
  930 #else
  931                                 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
  932                                                eoff, sizeof(*eh));
  933                                 if (eh == NULL) {
  934                                         icmp6stat.icp6s_tooshort++;
  935                                         return(-1);
  936                                 }
  937 #endif
  938                                 
  939                                 if (nxt == IPPROTO_AH)
  940                                         eoff += (eh->ip6e_len + 2) << 2;
  941                                 else
  942                                         eoff += (eh->ip6e_len + 1) << 3;
  943                                 nxt = eh->ip6e_nxt;
  944                                 break;
  945                         case IPPROTO_ROUTING:
  946                                 /*
  947                                  * When the erroneous packet contains a
  948                                  * routing header, we should examine the
  949                                  * header to determine the final destination.
  950                                  * Otherwise, we can't properly update
  951                                  * information that depends on the final
  952                                  * destination (e.g. path MTU).
  953                                  */
  954 #ifndef PULLDOWN_TEST
  955                                 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
  956                                                  -1);
  957                                 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
  958                                                            + eoff);
  959 #else
  960                                 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
  961                                                eoff, sizeof(*rth));
  962                                 if (rth == NULL) {
  963                                         icmp6stat.icp6s_tooshort++;
  964                                         return(-1);
  965                                 }
  966 #endif
  967                                 rthlen = (rth->ip6r_len + 1) << 3;
  968                                 /*
  969                                  * XXX: currently there is no
  970                                  * officially defined type other
  971                                  * than type-0.
  972                                  * Note that if the segment left field
  973                                  * is 0, all intermediate hops must
  974                                  * have been passed.
  975                                  */
  976                                 if (rth->ip6r_segleft &&
  977                                     rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
  978                                         int hops;
  979 
  980 #ifndef PULLDOWN_TEST
  981                                         IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
  982                                                          -1);
  983                                         rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
  984 #else
  985                                         IP6_EXTHDR_GET(rth0,
  986                                                        struct ip6_rthdr0 *, m,
  987                                                        eoff, rthlen);
  988                                         if (rth0 == NULL) {
  989                                                 icmp6stat.icp6s_tooshort++;
  990                                                 return(-1);
  991                                         }
  992 #endif
  993                                         /* just ignore a bogus header */
  994                                         if ((rth0->ip6r0_len % 2) == 0 &&
  995                                             (hops = rth0->ip6r0_len/2))
  996                                                 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
  997                                 }
  998                                 eoff += rthlen;
  999                                 nxt = rth->ip6r_nxt;
 1000                                 break;
 1001                         case IPPROTO_FRAGMENT:
 1002 #ifndef PULLDOWN_TEST
 1003                                 IP6_EXTHDR_CHECK(m, 0, eoff +
 1004                                                  sizeof(struct ip6_frag),
 1005                                                  -1);
 1006                                 fh = (struct ip6_frag *)(mtod(m, caddr_t)
 1007                                                          + eoff);
 1008 #else
 1009                                 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
 1010                                                eoff, sizeof(*fh));
 1011                                 if (fh == NULL) {
 1012                                         icmp6stat.icp6s_tooshort++;
 1013                                         return(-1);
 1014                                 }
 1015 #endif
 1016                                 /*
 1017                                  * Data after a fragment header is meaningless
 1018                                  * unless it is the first fragment, but
 1019                                  * we'll go to the notify label for path MTU
 1020                                  * discovery.
 1021                                  */
 1022                                 if (fh->ip6f_offlg & IP6F_OFF_MASK)
 1023                                         goto notify;
 1024 
 1025                                 eoff += sizeof(struct ip6_frag);
 1026                                 nxt = fh->ip6f_nxt;
 1027                                 break;
 1028                         default:
 1029                                 /*
 1030                                  * This case includes ESP and the No Next
 1031                                  * Header.  In such cases going to the notify
 1032                                  * label does not have any meaning
 1033                                  * (i.e. ctlfunc will be NULL), but we go
 1034                                  * anyway since we might have to update
 1035                                  * path MTU information.
 1036                                  */
 1037                                 goto notify;
 1038                         }
 1039                 }
 1040           notify:
 1041 #ifndef PULLDOWN_TEST
 1042                 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
 1043 #else
 1044                 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
 1045                                sizeof(*icmp6) + sizeof(struct ip6_hdr));
 1046                 if (icmp6 == NULL) {
 1047                         icmp6stat.icp6s_tooshort++;
 1048                         return(-1);
 1049                 }
 1050 #endif
 1051 
 1052                 eip6 = (struct ip6_hdr *)(icmp6 + 1);
 1053                 bzero(&icmp6dst, sizeof(icmp6dst));
 1054                 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
 1055                 icmp6dst.sin6_family = AF_INET6;
 1056                 if (finaldst == NULL)
 1057                         icmp6dst.sin6_addr = eip6->ip6_dst;
 1058                 else
 1059                         icmp6dst.sin6_addr = *finaldst;
 1060                 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
 1061                                                           &icmp6dst.sin6_addr);
 1062 #ifndef SCOPEDROUTING
 1063                 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
 1064                                    NULL, NULL)) {
 1065                         /* should be impossbile */
 1066                         nd6log((LOG_DEBUG,
 1067                             "icmp6_notify_error: in6_embedscope failed\n"));
 1068                         goto freeit;
 1069                 }
 1070 #endif
 1071 
 1072                 /*
 1073                  * retrieve parameters from the inner IPv6 header, and convert
 1074                  * them into sockaddr structures.
 1075                  */
 1076                 bzero(&icmp6src, sizeof(icmp6src));
 1077                 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
 1078                 icmp6src.sin6_family = AF_INET6;
 1079                 icmp6src.sin6_addr = eip6->ip6_src;
 1080                 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
 1081                                                           &icmp6src.sin6_addr);
 1082 #ifndef SCOPEDROUTING
 1083                 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
 1084                                    NULL, NULL)) {
 1085                         /* should be impossbile */
 1086                         nd6log((LOG_DEBUG,
 1087                             "icmp6_notify_error: in6_embedscope failed\n"));
 1088                         goto freeit;
 1089                 }
 1090 #endif
 1091                 icmp6src.sin6_flowinfo =
 1092                         (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
 1093 
 1094                 if (finaldst == NULL)
 1095                         finaldst = &eip6->ip6_dst;
 1096                 ip6cp.ip6c_m = m;
 1097                 ip6cp.ip6c_icmp6 = icmp6;
 1098                 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
 1099                 ip6cp.ip6c_off = eoff;
 1100                 ip6cp.ip6c_finaldst = finaldst;
 1101                 ip6cp.ip6c_src = &icmp6src;
 1102                 ip6cp.ip6c_nxt = nxt;
 1103 
 1104                 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
 1105                         notifymtu = ntohl(icmp6->icmp6_mtu);
 1106                         ip6cp.ip6c_cmdarg = (void *)&notifymtu;
 1107                         icmp6_mtudisc_update(&ip6cp, 1);        /*XXX*/
 1108                 }
 1109 
 1110                 ctlfunc = (void (*) __P((int, struct sockaddr *, void *)))
 1111                         (inet6sw[ip6_protox[nxt]].pr_ctlinput);
 1112                 if (ctlfunc) {
 1113                         (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
 1114                                           &ip6cp);
 1115                 }
 1116         }
 1117         return(0);
 1118 
 1119   freeit:
 1120         m_freem(m);
 1121         return(-1);
 1122 }
 1123 
 1124 void
 1125 icmp6_mtudisc_update(ip6cp, validated)
 1126         struct ip6ctlparam *ip6cp;
 1127         int validated;
 1128 {
 1129         struct in6_addr *dst = ip6cp->ip6c_finaldst;
 1130         struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
 1131         struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
 1132         u_int mtu = ntohl(icmp6->icmp6_mtu);
 1133         struct rtentry *rt = NULL;
 1134         struct sockaddr_in6 sin6;
 1135 
 1136         if (!validated)
 1137                 return;
 1138 
 1139         bzero(&sin6, sizeof(sin6));
 1140         sin6.sin6_family = PF_INET6;
 1141         sin6.sin6_len = sizeof(struct sockaddr_in6);
 1142         sin6.sin6_addr = *dst;
 1143         /* XXX normally, this won't happen */
 1144         if (IN6_IS_ADDR_LINKLOCAL(dst)) {
 1145                 sin6.sin6_addr.s6_addr16[1] =
 1146                     htons(m->m_pkthdr.rcvif->if_index);
 1147         }
 1148         /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
 1149         rt = rtalloc1((struct sockaddr *)&sin6, 0,
 1150                       RTF_CLONING | RTF_PRCLONING);
 1151 
 1152         if (rt && (rt->rt_flags & RTF_HOST)
 1153             && !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
 1154                 if (mtu < IPV6_MMTU) {
 1155                                 /* xxx */
 1156                         rt->rt_rmx.rmx_locks |= RTV_MTU;
 1157                 } else if (mtu < rt->rt_ifp->if_mtu &&
 1158                            rt->rt_rmx.rmx_mtu > mtu) {
 1159                         icmp6stat.icp6s_pmtuchg++;
 1160                         rt->rt_rmx.rmx_mtu = mtu;
 1161                 }
 1162         }
 1163         if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */
 1164                 RTFREE(rt);
 1165         }
 1166 }
 1167 
 1168 /*
 1169  * Process a Node Information Query packet, based on
 1170  * draft-ietf-ipngwg-icmp-name-lookups-07.
 1171  * 
 1172  * Spec incompatibilities:
 1173  * - IPv6 Subject address handling
 1174  * - IPv4 Subject address handling support missing
 1175  * - Proxy reply (answer even if it's not for me)
 1176  * - joins NI group address at in6_ifattach() time only, does not cope
 1177  *   with hostname changes by sethostname(3)
 1178  */
 1179 #define hostnamelen     strlen(hostname)
 1180 static struct mbuf *
 1181 ni6_input(m, off)
 1182         struct mbuf *m;
 1183         int off;
 1184 {
 1185         struct icmp6_nodeinfo *ni6, *nni6;
 1186         struct mbuf *n = NULL;
 1187         u_int16_t qtype;
 1188         int subjlen;
 1189         int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
 1190         struct ni_reply_fqdn *fqdn;
 1191         int addrs;              /* for NI_QTYPE_NODEADDR */
 1192         struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
 1193         struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
 1194         struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
 1195         struct ip6_hdr *ip6;
 1196         int oldfqdn = 0;        /* if 1, return pascal string (03 draft) */
 1197         char *subj = NULL;
 1198         struct in6_ifaddr *ia6 = NULL;
 1199 
 1200         ip6 = mtod(m, struct ip6_hdr *);
 1201 #ifndef PULLDOWN_TEST
 1202         ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
 1203 #else
 1204         IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
 1205         if (ni6 == NULL) {
 1206                 /* m is already reclaimed */
 1207                 return NULL;
 1208         }
 1209 #endif
 1210 
 1211         /*
 1212          * Validate IPv6 destination address.
 1213          *
 1214          * The Responder must discard the Query without further processing
 1215          * unless it is one of the Responder's unicast or anycast addresses, or
 1216          * a link-local scope multicast address which the Responder has joined.
 1217          * [icmp-name-lookups-07, Section 4.]
 1218          */
 1219         bzero(&sin6, sizeof(sin6));
 1220         sin6.sin6_family = AF_INET6;
 1221         sin6.sin6_len = sizeof(struct sockaddr_in6);
 1222         bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
 1223         /* XXX scopeid */
 1224         if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
 1225                 /* unicast/anycast, fine */
 1226                 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
 1227                     (icmp6_nodeinfo & 4) == 0) {
 1228                         nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
 1229                                 "a temporary address in %s:%d",
 1230                                __FILE__, __LINE__));
 1231                         goto bad;
 1232                 }
 1233         } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
 1234                 ; /* link-local multicast, fine */
 1235         else
 1236                 goto bad;
 1237 
 1238         /* validate query Subject field. */
 1239         qtype = ntohs(ni6->ni_qtype);
 1240         subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
 1241         switch (qtype) {
 1242         case NI_QTYPE_NOOP:
 1243         case NI_QTYPE_SUPTYPES:
 1244                 /* 07 draft */
 1245                 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
 1246                         break;
 1247                 /* FALLTHROUGH */
 1248         case NI_QTYPE_FQDN:
 1249         case NI_QTYPE_NODEADDR:
 1250                 switch (ni6->ni_code) {
 1251                 case ICMP6_NI_SUBJ_IPV6:
 1252 #if ICMP6_NI_SUBJ_IPV6 != 0
 1253                 case 0:
 1254 #endif
 1255                         /*
 1256                          * backward compatibility - try to accept 03 draft
 1257                          * format, where no Subject is present.
 1258                          */
 1259                         if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
 1260                             subjlen == 0) {
 1261                                 oldfqdn++;
 1262                                 break;
 1263                         }
 1264 #if ICMP6_NI_SUBJ_IPV6 != 0
 1265                         if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
 1266                                 goto bad;
 1267 #endif
 1268 
 1269                         if (subjlen != sizeof(sin6.sin6_addr))
 1270                                 goto bad;
 1271 
 1272                         /*
 1273                          * Validate Subject address.
 1274                          *
 1275                          * Not sure what exactly "address belongs to the node"
 1276                          * means in the spec, is it just unicast, or what?
 1277                          *
 1278                          * At this moment we consider Subject address as
 1279                          * "belong to the node" if the Subject address equals
 1280                          * to the IPv6 destination address; validation for
 1281                          * IPv6 destination address should have done enough
 1282                          * check for us.
 1283                          *
 1284                          * We do not do proxy at this moment.
 1285                          */
 1286                         /* m_pulldown instead of copy? */
 1287                         m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
 1288                             subjlen, (caddr_t)&sin6.sin6_addr);
 1289                         sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
 1290                                                               &sin6.sin6_addr);
 1291 #ifndef SCOPEDROUTING
 1292                         in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
 1293 #endif
 1294                         bzero(&sin6_d, sizeof(sin6_d));
 1295                         sin6_d.sin6_family = AF_INET6; /* not used, actually */
 1296                         sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
 1297                         sin6_d.sin6_addr = ip6->ip6_dst;
 1298                         sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
 1299                                                                 &ip6->ip6_dst);
 1300 #ifndef SCOPEDROUTING
 1301                         in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
 1302 #endif
 1303                         subj = (char *)&sin6;
 1304                         if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
 1305                                 break;
 1306 
 1307                         /*
 1308                          * XXX if we are to allow other cases, we should really
 1309                          * be careful about scope here.
 1310                          * basically, we should disallow queries toward IPv6
 1311                          * destination X with subject Y, if scope(X) > scope(Y).
 1312                          * if we allow scope(X) > scope(Y), it will result in
 1313                          * information leakage across scope boundary.
 1314                          */
 1315                         goto bad;
 1316 
 1317                 case ICMP6_NI_SUBJ_FQDN:
 1318                         /*
 1319                          * Validate Subject name with gethostname(3).
 1320                          *
 1321                          * The behavior may need some debate, since:
 1322                          * - we are not sure if the node has FQDN as
 1323                          *   hostname (returned by gethostname(3)).
 1324                          * - the code does wildcard match for truncated names.
 1325                          *   however, we are not sure if we want to perform
 1326                          *   wildcard match, if gethostname(3) side has
 1327                          *   truncated hostname.
 1328                          */
 1329                         n = ni6_nametodns(hostname, hostnamelen, 0);
 1330                         if (!n || n->m_next || n->m_len == 0)
 1331                                 goto bad;
 1332                         IP6_EXTHDR_GET(subj, char *, m,
 1333                             off + sizeof(struct icmp6_nodeinfo), subjlen);
 1334                         if (subj == NULL)
 1335                                 goto bad;
 1336                         if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
 1337                                         n->m_len)) {
 1338                                 goto bad;
 1339                         }
 1340                         m_freem(n);
 1341                         n = NULL;
 1342                         break;
 1343 
 1344                 case ICMP6_NI_SUBJ_IPV4:        /* XXX: to be implemented? */
 1345                 default:
 1346                         goto bad;
 1347                 }
 1348                 break;
 1349         }
 1350 
 1351         /* refuse based on configuration.  XXX ICMP6_NI_REFUSED? */
 1352         switch (qtype) {
 1353         case NI_QTYPE_FQDN:
 1354                 if ((icmp6_nodeinfo & 1) == 0)
 1355                         goto bad;
 1356                 break;
 1357         case NI_QTYPE_NODEADDR:
 1358                 if ((icmp6_nodeinfo & 2) == 0)
 1359                         goto bad;
 1360                 break;
 1361         }
 1362 
 1363         /* guess reply length */
 1364         switch (qtype) {
 1365         case NI_QTYPE_NOOP:
 1366                 break;          /* no reply data */
 1367         case NI_QTYPE_SUPTYPES:
 1368                 replylen += sizeof(u_int32_t);
 1369                 break;
 1370         case NI_QTYPE_FQDN:
 1371                 /* XXX will append an mbuf */
 1372                 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
 1373                 break;
 1374         case NI_QTYPE_NODEADDR:
 1375                 addrs = ni6_addrs(ni6, m, &ifp, subj);
 1376                 if ((replylen += addrs * (sizeof(struct in6_addr) +
 1377                                           sizeof(u_int32_t))) > MCLBYTES)
 1378                         replylen = MCLBYTES; /* XXX: will truncate pkt later */
 1379                 break;
 1380         default:
 1381                 /*
 1382                  * XXX: We must return a reply with the ICMP6 code
 1383                  * `unknown Qtype' in this case. However we regard the case
 1384                  * as an FQDN query for backward compatibility.
 1385                  * Older versions set a random value to this field,
 1386                  * so it rarely varies in the defined qtypes.
 1387                  * But the mechanism is not reliable...
 1388                  * maybe we should obsolete older versions.
 1389                  */
 1390                 qtype = NI_QTYPE_FQDN;
 1391                 /* XXX will append an mbuf */
 1392                 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
 1393                 oldfqdn++;
 1394                 break;
 1395         }
 1396 
 1397         /* allocate an mbuf to reply. */
 1398         MGETHDR(n, M_DONTWAIT, m->m_type);
 1399         if (n == NULL) {
 1400                 m_freem(m);
 1401                 return(NULL);
 1402         }
 1403         M_MOVE_PKTHDR(n, m); /* just for recvif */
 1404         if (replylen > MHLEN) {
 1405                 if (replylen > MCLBYTES) {
 1406                         /*
 1407                          * XXX: should we try to allocate more? But MCLBYTES
 1408                          * is probably much larger than IPV6_MMTU...
 1409                          */
 1410                         goto bad;
 1411                 }
 1412                 MCLGET(n, M_DONTWAIT);
 1413                 if ((n->m_flags & M_EXT) == 0) {
 1414                         goto bad;
 1415                 }
 1416         }
 1417         n->m_pkthdr.len = n->m_len = replylen;
 1418 
 1419         /* copy mbuf header and IPv6 + Node Information base headers */
 1420         bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
 1421         nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
 1422         bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
 1423 
 1424         /* qtype dependent procedure */
 1425         switch (qtype) {
 1426         case NI_QTYPE_NOOP:
 1427                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1428                 nni6->ni_flags = 0;
 1429                 break;
 1430         case NI_QTYPE_SUPTYPES:
 1431         {
 1432                 u_int32_t v;
 1433                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1434                 nni6->ni_flags = htons(0x0000); /* raw bitmap */
 1435                 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
 1436                 v = (u_int32_t)htonl(0x0000000f);
 1437                 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
 1438                 break;
 1439         }
 1440         case NI_QTYPE_FQDN:
 1441                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1442                 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
 1443                                                 sizeof(struct ip6_hdr) +
 1444                                                 sizeof(struct icmp6_nodeinfo));
 1445                 nni6->ni_flags = 0; /* XXX: meaningless TTL */
 1446                 fqdn->ni_fqdn_ttl = 0;  /* ditto. */
 1447                 /*
 1448                  * XXX do we really have FQDN in variable "hostname"?
 1449                  */
 1450                 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
 1451                 if (n->m_next == NULL)
 1452                         goto bad;
 1453                 /* XXX we assume that n->m_next is not a chain */
 1454                 if (n->m_next->m_next != NULL)
 1455                         goto bad;
 1456                 n->m_pkthdr.len += n->m_next->m_len;
 1457                 break;
 1458         case NI_QTYPE_NODEADDR:
 1459         {
 1460                 int lenlim, copied;
 1461 
 1462                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1463                 n->m_pkthdr.len = n->m_len =
 1464                     sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
 1465                 lenlim = M_TRAILINGSPACE(n);
 1466                 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
 1467                 /* XXX: reset mbuf length */
 1468                 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
 1469                         sizeof(struct icmp6_nodeinfo) + copied;
 1470                 break;
 1471         }
 1472         default:
 1473                 break;          /* XXX impossible! */
 1474         }
 1475 
 1476         nni6->ni_type = ICMP6_NI_REPLY;
 1477         m_freem(m);
 1478         return(n);
 1479 
 1480   bad:
 1481         m_freem(m);
 1482         if (n)
 1483                 m_freem(n);
 1484         return(NULL);
 1485 }
 1486 #undef hostnamelen
 1487 
 1488 /*
 1489  * make a mbuf with DNS-encoded string.  no compression support.
 1490  *
 1491  * XXX names with less than 2 dots (like "foo" or "foo.section") will be
 1492  * treated as truncated name (two \0 at the end).  this is a wild guess.
 1493  */
 1494 static struct mbuf *
 1495 ni6_nametodns(name, namelen, old)
 1496         const char *name;
 1497         int namelen;
 1498         int old;        /* return pascal string if non-zero */
 1499 {
 1500         struct mbuf *m;
 1501         char *cp, *ep;
 1502         const char *p, *q;
 1503         int i, len, nterm;
 1504 
 1505         if (old)
 1506                 len = namelen + 1;
 1507         else
 1508                 len = MCLBYTES;
 1509 
 1510         /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
 1511         MGET(m, M_DONTWAIT, MT_DATA);
 1512         if (m && len > MLEN) {
 1513                 MCLGET(m, M_DONTWAIT);
 1514                 if ((m->m_flags & M_EXT) == 0)
 1515                         goto fail;
 1516         }
 1517         if (!m)
 1518                 goto fail;
 1519         m->m_next = NULL;
 1520 
 1521         if (old) {
 1522                 m->m_len = len;
 1523                 *mtod(m, char *) = namelen;
 1524                 bcopy(name, mtod(m, char *) + 1, namelen);
 1525                 return m;
 1526         } else {
 1527                 m->m_len = 0;
 1528                 cp = mtod(m, char *);
 1529                 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
 1530 
 1531                 /* if not certain about my name, return empty buffer */
 1532                 if (namelen == 0)
 1533                         return m;
 1534 
 1535                 /*
 1536                  * guess if it looks like shortened hostname, or FQDN.
 1537                  * shortened hostname needs two trailing "\0".
 1538                  */
 1539                 i = 0;
 1540                 for (p = name; p < name + namelen; p++) {
 1541                         if (*p && *p == '.')
 1542                                 i++;
 1543                 }
 1544                 if (i < 2)
 1545                         nterm = 2;
 1546                 else
 1547                         nterm = 1;
 1548 
 1549                 p = name;
 1550                 while (cp < ep && p < name + namelen) {
 1551                         i = 0;
 1552                         for (q = p; q < name + namelen && *q && *q != '.'; q++)
 1553                                 i++;
 1554                         /* result does not fit into mbuf */
 1555                         if (cp + i + 1 >= ep)
 1556                                 goto fail;
 1557                         /*
 1558                          * DNS label length restriction, RFC1035 page 8.
 1559                          * "i == 0" case is included here to avoid returning
 1560                          * 0-length label on "foo..bar".
 1561                          */
 1562                         if (i <= 0 || i >= 64)
 1563                                 goto fail;
 1564                         *cp++ = i;
 1565                         bcopy(p, cp, i);
 1566                         cp += i;
 1567                         p = q;
 1568                         if (p < name + namelen && *p == '.')
 1569                                 p++;
 1570                 }
 1571                 /* termination */
 1572                 if (cp + nterm >= ep)
 1573                         goto fail;
 1574                 while (nterm-- > 0)
 1575                         *cp++ = '\0';
 1576                 m->m_len = cp - mtod(m, char *);
 1577                 return m;
 1578         }
 1579 
 1580         panic("should not reach here");
 1581         /* NOTREACHED */
 1582 
 1583  fail:
 1584         if (m)
 1585                 m_freem(m);
 1586         return NULL;
 1587 }
 1588 
 1589 /*
 1590  * check if two DNS-encoded string matches.  takes care of truncated
 1591  * form (with \0\0 at the end).  no compression support.
 1592  * XXX upper/lowercase match (see RFC2065)
 1593  */
 1594 static int
 1595 ni6_dnsmatch(a, alen, b, blen)
 1596         const char *a;
 1597         int alen;
 1598         const char *b;
 1599         int blen;
 1600 {
 1601         const char *a0, *b0;
 1602         int l;
 1603 
 1604         /* simplest case - need validation? */
 1605         if (alen == blen && bcmp(a, b, alen) == 0)
 1606                 return 1;
 1607 
 1608         a0 = a;
 1609         b0 = b;
 1610 
 1611         /* termination is mandatory */
 1612         if (alen < 2 || blen < 2)
 1613                 return 0;
 1614         if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
 1615                 return 0;
 1616         alen--;
 1617         blen--;
 1618 
 1619         while (a - a0 < alen && b - b0 < blen) {
 1620                 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
 1621                         return 0;
 1622 
 1623                 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
 1624                         return 0;
 1625                 /* we don't support compression yet */
 1626                 if (a[0] >= 64 || b[0] >= 64)
 1627                         return 0;
 1628 
 1629                 /* truncated case */
 1630                 if (a[0] == 0 && a - a0 == alen - 1)
 1631                         return 1;
 1632                 if (b[0] == 0 && b - b0 == blen - 1)
 1633                         return 1;
 1634                 if (a[0] == 0 || b[0] == 0)
 1635                         return 0;
 1636 
 1637                 if (a[0] != b[0])
 1638                         return 0;
 1639                 l = a[0];
 1640                 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
 1641                         return 0;
 1642                 if (bcmp(a + 1, b + 1, l) != 0)
 1643                         return 0;
 1644 
 1645                 a += 1 + l;
 1646                 b += 1 + l;
 1647         }
 1648 
 1649         if (a - a0 == alen && b - b0 == blen)
 1650                 return 1;
 1651         else
 1652                 return 0;
 1653 }
 1654 
 1655 /*
 1656  * calculate the number of addresses to be returned in the node info reply.
 1657  */
 1658 static int
 1659 ni6_addrs(ni6, m, ifpp, subj)
 1660         struct icmp6_nodeinfo *ni6;
 1661         struct mbuf *m;
 1662         struct ifnet **ifpp;
 1663         char *subj;
 1664 {
 1665         struct ifnet *ifp;
 1666         struct in6_ifaddr *ifa6;
 1667         struct ifaddr *ifa;
 1668         struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
 1669         int addrs = 0, addrsofif, iffound = 0;
 1670         int niflags = ni6->ni_flags;
 1671 
 1672         if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
 1673                 switch (ni6->ni_code) {
 1674                 case ICMP6_NI_SUBJ_IPV6:
 1675                         if (subj == NULL) /* must be impossible... */
 1676                                 return(0);
 1677                         subj_ip6 = (struct sockaddr_in6 *)subj;
 1678                         break;
 1679                 default:
 1680                         /*
 1681                          * XXX: we only support IPv6 subject address for
 1682                          * this Qtype.
 1683                          */
 1684                         return(0);
 1685                 }
 1686         }
 1687 
 1688         IFNET_RLOCK();
 1689         for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
 1690         {
 1691                 addrsofif = 0;
 1692                 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
 1693                 {
 1694                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1695                                 continue;
 1696                         ifa6 = (struct in6_ifaddr *)ifa;
 1697 
 1698                         if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
 1699                             IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
 1700                                                &ifa6->ia_addr.sin6_addr))
 1701                                 iffound = 1;
 1702 
 1703                         /*
 1704                          * IPv4-mapped addresses can only be returned by a
 1705                          * Node Information proxy, since they represent
 1706                          * addresses of IPv4-only nodes, which perforce do
 1707                          * not implement this protocol.
 1708                          * [icmp-name-lookups-07, Section 5.4]
 1709                          * So we don't support NI_NODEADDR_FLAG_COMPAT in
 1710                          * this function at this moment.
 1711                          */
 1712 
 1713                         /* What do we have to do about ::1? */
 1714                         switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
 1715                         case IPV6_ADDR_SCOPE_LINKLOCAL:
 1716                                 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
 1717                                         continue;
 1718                                 break;
 1719                         case IPV6_ADDR_SCOPE_SITELOCAL:
 1720                                 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
 1721                                         continue;
 1722                                 break;
 1723                         case IPV6_ADDR_SCOPE_GLOBAL:
 1724                                 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
 1725                                         continue;
 1726                                 break;
 1727                         default:
 1728                                 continue;
 1729                         }
 1730 
 1731                         /*
 1732                          * check if anycast is okay.
 1733                          * XXX: just experimental.  not in the spec.
 1734                          */
 1735                         if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
 1736                             (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
 1737                                 continue; /* we need only unicast addresses */
 1738                         if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
 1739                             (icmp6_nodeinfo & 4) == 0) {
 1740                                 continue;
 1741                         }
 1742                         addrsofif++; /* count the address */
 1743                 }
 1744                 if (iffound) {
 1745                         *ifpp = ifp;
 1746                         IFNET_RUNLOCK();
 1747                         return(addrsofif);
 1748                 }
 1749 
 1750                 addrs += addrsofif;
 1751         }
 1752         IFNET_RUNLOCK();
 1753 
 1754         return(addrs);
 1755 }
 1756 
 1757 static int
 1758 ni6_store_addrs(ni6, nni6, ifp0, resid)
 1759         struct icmp6_nodeinfo *ni6, *nni6;
 1760         struct ifnet *ifp0;
 1761         int resid;
 1762 {
 1763         struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
 1764         struct in6_ifaddr *ifa6;
 1765         struct ifaddr *ifa;
 1766         struct ifnet *ifp_dep = NULL;
 1767         int copied = 0, allow_deprecated = 0;
 1768         u_char *cp = (u_char *)(nni6 + 1);
 1769         int niflags = ni6->ni_flags;
 1770         u_int32_t ltime;
 1771 
 1772         if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
 1773                 return(0);      /* needless to copy */
 1774                 
 1775         IFNET_RLOCK();
 1776   again:
 1777         for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
 1778         {
 1779                 for (ifa = ifp->if_addrlist.tqh_first; ifa;
 1780                      ifa = ifa->ifa_list.tqe_next)
 1781                 {
 1782                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1783                                 continue;
 1784                         ifa6 = (struct in6_ifaddr *)ifa;
 1785 
 1786                         if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
 1787                             allow_deprecated == 0) {
 1788                                 /*
 1789                                  * prefererred address should be put before
 1790                                  * deprecated addresses.
 1791                                  */
 1792 
 1793                                 /* record the interface for later search */
 1794                                 if (ifp_dep == NULL)
 1795                                         ifp_dep = ifp;
 1796 
 1797                                 continue;
 1798                         }
 1799                         else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
 1800                                  allow_deprecated != 0)
 1801                                 continue; /* we now collect deprecated addrs */
 1802 
 1803                         /* What do we have to do about ::1? */
 1804                         switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
 1805                         case IPV6_ADDR_SCOPE_LINKLOCAL:
 1806                                 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
 1807                                         continue;
 1808                                 break;
 1809                         case IPV6_ADDR_SCOPE_SITELOCAL:
 1810                                 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
 1811                                         continue;
 1812                                 break;
 1813                         case IPV6_ADDR_SCOPE_GLOBAL:
 1814                                 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
 1815                                         continue;
 1816                                 break;
 1817                         default:
 1818                                 continue;
 1819                         }
 1820 
 1821                         /*
 1822                          * check if anycast is okay.
 1823                          * XXX: just experimental. not in the spec.
 1824                          */
 1825                         if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
 1826                             (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
 1827                                 continue;
 1828                         if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
 1829                             (icmp6_nodeinfo & 4) == 0) {
 1830                                 continue;
 1831                         }
 1832 
 1833                         /* now we can copy the address */
 1834                         if (resid < sizeof(struct in6_addr) +
 1835                             sizeof(u_int32_t)) {
 1836                                 /*
 1837                                  * We give up much more copy.
 1838                                  * Set the truncate flag and return.
 1839                                  */
 1840                                 nni6->ni_flags |=
 1841                                         NI_NODEADDR_FLAG_TRUNCATE;
 1842                                 IFNET_RUNLOCK();
 1843                                 return(copied);
 1844                         }
 1845 
 1846                         /*
 1847                          * Set the TTL of the address.
 1848                          * The TTL value should be one of the following
 1849                          * according to the specification:
 1850                          *
 1851                          * 1. The remaining lifetime of a DHCP lease on the
 1852                          *    address, or
 1853                          * 2. The remaining Valid Lifetime of a prefix from
 1854                          *    which the address was derived through Stateless
 1855                          *    Autoconfiguration.
 1856                          *
 1857                          * Note that we currently do not support stateful
 1858                          * address configuration by DHCPv6, so the former
 1859                          * case can't happen.
 1860                          */
 1861                         if (ifa6->ia6_lifetime.ia6t_expire == 0)
 1862                                 ltime = ND6_INFINITE_LIFETIME;
 1863                         else {
 1864                                 if (ifa6->ia6_lifetime.ia6t_expire >
 1865                                     time_second)
 1866                                         ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
 1867                                 else
 1868                                         ltime = 0;
 1869                         }
 1870                         
 1871                         bcopy(&ltime, cp, sizeof(u_int32_t));
 1872                         cp += sizeof(u_int32_t);
 1873 
 1874                         /* copy the address itself */
 1875                         bcopy(&ifa6->ia_addr.sin6_addr, cp,
 1876                               sizeof(struct in6_addr));
 1877                         /* XXX: KAME link-local hack; remove ifindex */
 1878                         if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
 1879                                 ((struct in6_addr *)cp)->s6_addr16[1] = 0;
 1880                         cp += sizeof(struct in6_addr);
 1881                         
 1882                         resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
 1883                         copied += (sizeof(struct in6_addr) +
 1884                                    sizeof(u_int32_t));
 1885                 }
 1886                 if (ifp0)       /* we need search only on the specified IF */
 1887                         break;
 1888         }
 1889 
 1890         if (allow_deprecated == 0 && ifp_dep != NULL) {
 1891                 ifp = ifp_dep;
 1892                 allow_deprecated = 1;
 1893 
 1894                 goto again;
 1895         }
 1896 
 1897         IFNET_RUNLOCK();
 1898 
 1899         return(copied);
 1900 }
 1901 
 1902 /*
 1903  * XXX almost dup'ed code with rip6_input.
 1904  */
 1905 static int
 1906 icmp6_rip6_input(mp, off)
 1907         struct  mbuf **mp;
 1908         int     off;
 1909 {
 1910         struct mbuf *m = *mp;
 1911         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1912         struct in6pcb *in6p;
 1913         struct in6pcb *last = NULL;
 1914         struct sockaddr_in6 rip6src;
 1915         struct icmp6_hdr *icmp6;
 1916         struct mbuf *opts = NULL;
 1917 
 1918 #ifndef PULLDOWN_TEST
 1919         /* this is assumed to be safe. */
 1920         icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
 1921 #else
 1922         IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
 1923         if (icmp6 == NULL) {
 1924                 /* m is already reclaimed */
 1925                 return IPPROTO_DONE;
 1926         }
 1927 #endif
 1928 
 1929         bzero(&rip6src, sizeof(rip6src));
 1930         rip6src.sin6_len = sizeof(struct sockaddr_in6);
 1931         rip6src.sin6_family = AF_INET6;
 1932         /* KAME hack: recover scopeid */
 1933         (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
 1934 
 1935         LIST_FOREACH(in6p, &ripcb, inp_list)
 1936         {
 1937                 if ((in6p->inp_vflag & INP_IPV6) == 0)
 1938                         continue;
 1939 #ifdef HAVE_NRL_INPCB
 1940                 if (!(in6p->in6p_flags & INP_IPV6))
 1941                         continue;
 1942 #endif
 1943                 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
 1944                         continue;
 1945                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
 1946                    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
 1947                         continue;
 1948                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
 1949                    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
 1950                         continue;
 1951                 if (in6p->in6p_icmp6filt
 1952                     && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
 1953                                  in6p->in6p_icmp6filt))
 1954                         continue;
 1955                 if (last) {
 1956                         struct  mbuf *n;
 1957                         if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
 1958                                 if (last->in6p_flags & IN6P_CONTROLOPTS)
 1959                                         ip6_savecontrol(last, &opts, ip6, n);
 1960                                 /* strip intermediate headers */
 1961                                 m_adj(n, off);
 1962                                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 1963                                                  (struct sockaddr *)&rip6src,
 1964                                                  n, opts) == 0) {
 1965                                         /* should notify about lost packet */
 1966                                         m_freem(n);
 1967                                         if (opts) {
 1968                                                 m_freem(opts);
 1969                                         }
 1970                                 } else
 1971                                         sorwakeup(last->in6p_socket);
 1972                                 opts = NULL;
 1973                         }
 1974                 }
 1975                 last = in6p;
 1976         }
 1977         if (last) {
 1978                 if (last->in6p_flags & IN6P_CONTROLOPTS)
 1979                         ip6_savecontrol(last, &opts, ip6, m);
 1980                 /* strip intermediate headers */
 1981                 m_adj(m, off);
 1982                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 1983                                  (struct sockaddr *)&rip6src, m, opts) == 0) {
 1984                         m_freem(m);
 1985                         if (opts)
 1986                                 m_freem(opts);
 1987                 } else
 1988                         sorwakeup(last->in6p_socket);
 1989         } else {
 1990                 m_freem(m);
 1991                 ip6stat.ip6s_delivered--;
 1992         }
 1993         return IPPROTO_DONE;
 1994 }
 1995 
 1996 /*
 1997  * Reflect the ip6 packet back to the source.
 1998  * OFF points to the icmp6 header, counted from the top of the mbuf.
 1999  */
 2000 void
 2001 icmp6_reflect(m, off)
 2002         struct  mbuf *m;
 2003         size_t off;
 2004 {
 2005         struct ip6_hdr *ip6;
 2006         struct icmp6_hdr *icmp6;
 2007         struct in6_ifaddr *ia;
 2008         struct in6_addr t, *src = 0;
 2009         int plen;
 2010         int type, code;
 2011         struct ifnet *outif = NULL;
 2012         struct sockaddr_in6 sa6_src, sa6_dst;
 2013 #ifdef COMPAT_RFC1885
 2014         int mtu = IPV6_MMTU;
 2015         struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
 2016 #endif
 2017 
 2018         /* too short to reflect */
 2019         if (off < sizeof(struct ip6_hdr)) {
 2020                 nd6log((LOG_DEBUG,
 2021                     "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
 2022                     (u_long)off, (u_long)sizeof(struct ip6_hdr),
 2023                     __FILE__, __LINE__));
 2024                 goto bad;
 2025         }
 2026 
 2027         /*
 2028          * If there are extra headers between IPv6 and ICMPv6, strip
 2029          * off that header first.
 2030          */
 2031 #ifdef DIAGNOSTIC
 2032         if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
 2033                 panic("assumption failed in icmp6_reflect");
 2034 #endif
 2035         if (off > sizeof(struct ip6_hdr)) {
 2036                 size_t l;
 2037                 struct ip6_hdr nip6;
 2038 
 2039                 l = off - sizeof(struct ip6_hdr);
 2040                 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
 2041                 m_adj(m, l);
 2042                 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
 2043                 if (m->m_len < l) {
 2044                         if ((m = m_pullup(m, l)) == NULL)
 2045                                 return;
 2046                 }
 2047                 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
 2048         } else /* off == sizeof(struct ip6_hdr) */ {
 2049                 size_t l;
 2050                 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
 2051                 if (m->m_len < l) {
 2052                         if ((m = m_pullup(m, l)) == NULL)
 2053                                 return;
 2054                 }
 2055         }
 2056         plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
 2057         ip6 = mtod(m, struct ip6_hdr *);
 2058         ip6->ip6_nxt = IPPROTO_ICMPV6;
 2059         icmp6 = (struct icmp6_hdr *)(ip6 + 1);
 2060         type = icmp6->icmp6_type; /* keep type for statistics */
 2061         code = icmp6->icmp6_code; /* ditto. */
 2062 
 2063         t = ip6->ip6_dst;
 2064         /*
 2065          * ip6_input() drops a packet if its src is multicast.
 2066          * So, the src is never multicast.
 2067          */
 2068         ip6->ip6_dst = ip6->ip6_src;
 2069 
 2070         /*
 2071          * XXX: make sure to embed scope zone information, using
 2072          * already embedded IDs or the received interface (if any).
 2073          * Note that rcvif may be NULL.
 2074          * TODO: scoped routing case (XXX).
 2075          */
 2076         bzero(&sa6_src, sizeof(sa6_src));
 2077         sa6_src.sin6_family = AF_INET6;
 2078         sa6_src.sin6_len = sizeof(sa6_src);
 2079         sa6_src.sin6_addr = ip6->ip6_dst;
 2080         in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
 2081         in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
 2082         bzero(&sa6_dst, sizeof(sa6_dst));
 2083         sa6_dst.sin6_family = AF_INET6;
 2084         sa6_dst.sin6_len = sizeof(sa6_dst);
 2085         sa6_dst.sin6_addr = t;
 2086         in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
 2087         in6_embedscope(&t, &sa6_dst, NULL, NULL);
 2088 
 2089 #ifdef COMPAT_RFC1885
 2090         /*
 2091          * xxx guess MTU
 2092          * RFC 1885 requires that echo reply should be truncated if it
 2093          * does not fit in with (return) path MTU, but the description was
 2094          * removed in the new spec.
 2095          */
 2096         if (icmp6_reflect_rt.ro_rt == 0 ||
 2097             ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
 2098                 if (icmp6_reflect_rt.ro_rt) {
 2099                         RTFREE(icmp6_reflect_rt.ro_rt);
 2100                         icmp6_reflect_rt.ro_rt = 0;
 2101                 }
 2102                 bzero(sin6, sizeof(*sin6));
 2103                 sin6->sin6_family = PF_INET6;
 2104                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 2105                 sin6->sin6_addr = ip6->ip6_dst;
 2106 
 2107                 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
 2108                             RTF_PRCLONING);
 2109         }
 2110 
 2111         if (icmp6_reflect_rt.ro_rt == 0)
 2112                 goto bad;
 2113 
 2114         if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
 2115             && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
 2116                 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
 2117 
 2118         if (mtu < m->m_pkthdr.len) {
 2119                 plen -= (m->m_pkthdr.len - mtu);
 2120                 m_adj(m, mtu - m->m_pkthdr.len);
 2121         }
 2122 #endif
 2123         /*
 2124          * If the incoming packet was addressed directly to us(i.e. unicast),
 2125          * use dst as the src for the reply.
 2126          * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
 2127          * (for example) when we encounter an error while forwarding procedure
 2128          * destined to a duplicated address of ours.
 2129          */
 2130         for (ia = in6_ifaddr; ia; ia = ia->ia_next)
 2131                 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
 2132                     (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
 2133                         src = &t;
 2134                         break;
 2135                 }
 2136         if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
 2137                 /*
 2138                  * This is the case if the dst is our link-local address
 2139                  * and the sender is also ourselves.
 2140                  */
 2141                 src = &t;
 2142         }
 2143 
 2144         if (src == 0) {
 2145                 int e;
 2146                 struct route_in6 ro;
 2147 
 2148                 /*
 2149                  * This case matches to multicasts, our anycast, or unicasts
 2150                  * that we do not own.  Select a source address based on the
 2151                  * source address of the erroneous packet.
 2152                  */
 2153                 bzero(&ro, sizeof(ro));
 2154                 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e);
 2155                 if (ro.ro_rt)
 2156                         RTFREE(ro.ro_rt); /* XXX: we could use this */
 2157                 if (src == NULL) {
 2158                         nd6log((LOG_DEBUG,
 2159                             "icmp6_reflect: source can't be determined: "
 2160                             "dst=%s, error=%d\n",
 2161                             ip6_sprintf(&sa6_src.sin6_addr), e));
 2162                         goto bad;
 2163                 }
 2164         }
 2165 
 2166         ip6->ip6_src = *src;
 2167 
 2168         ip6->ip6_flow = 0;
 2169         ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
 2170         ip6->ip6_vfc |= IPV6_VERSION;
 2171         ip6->ip6_nxt = IPPROTO_ICMPV6;
 2172         if (m->m_pkthdr.rcvif) {
 2173                 /* XXX: This may not be the outgoing interface */
 2174                 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim;
 2175         } else
 2176                 ip6->ip6_hlim = ip6_defhlim;
 2177 
 2178         icmp6->icmp6_cksum = 0;
 2179         icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
 2180                                         sizeof(struct ip6_hdr), plen);
 2181 
 2182         /*
 2183          * XXX option handling
 2184          */
 2185 
 2186         m->m_flags &= ~(M_BCAST|M_MCAST);
 2187 
 2188 #ifdef COMPAT_RFC1885
 2189         ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
 2190 #else
 2191         ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
 2192 #endif
 2193         if (outif)
 2194                 icmp6_ifoutstat_inc(outif, type, code);
 2195 
 2196         return;
 2197 
 2198  bad:
 2199         m_freem(m);
 2200         return;
 2201 }
 2202 
 2203 void
 2204 icmp6_fasttimo()
 2205 {
 2206 
 2207         mld6_fasttimeo();
 2208 }
 2209 
 2210 static const char *
 2211 icmp6_redirect_diag(src6, dst6, tgt6)
 2212         struct in6_addr *src6;
 2213         struct in6_addr *dst6;
 2214         struct in6_addr *tgt6;
 2215 {
 2216         static char buf[1024];
 2217         snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
 2218                 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
 2219         return buf;
 2220 }
 2221 
 2222 void
 2223 icmp6_redirect_input(m, off)
 2224         struct mbuf *m;
 2225         int off;
 2226 {
 2227         struct ifnet *ifp = m->m_pkthdr.rcvif;
 2228         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 2229         struct nd_redirect *nd_rd;
 2230         int icmp6len = ntohs(ip6->ip6_plen);
 2231         char *lladdr = NULL;
 2232         int lladdrlen = 0;
 2233         u_char *redirhdr = NULL;
 2234         int redirhdrlen = 0;
 2235         struct rtentry *rt = NULL;
 2236         int is_router;
 2237         int is_onlink;
 2238         struct in6_addr src6 = ip6->ip6_src;
 2239         struct in6_addr redtgt6;
 2240         struct in6_addr reddst6;
 2241         union nd_opts ndopts;
 2242 
 2243         if (!m || !ifp)
 2244                 return;
 2245 
 2246         /* XXX if we are router, we don't update route by icmp6 redirect */
 2247         if (ip6_forwarding)
 2248                 goto freeit;
 2249         if (!icmp6_rediraccept)
 2250                 goto freeit;
 2251 
 2252 #ifndef PULLDOWN_TEST
 2253         IP6_EXTHDR_CHECK(m, off, icmp6len,);
 2254         nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
 2255 #else
 2256         IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
 2257         if (nd_rd == NULL) {
 2258                 icmp6stat.icp6s_tooshort++;
 2259                 return;
 2260         }
 2261 #endif
 2262         redtgt6 = nd_rd->nd_rd_target;
 2263         reddst6 = nd_rd->nd_rd_dst;
 2264 
 2265         if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
 2266                 redtgt6.s6_addr16[1] = htons(ifp->if_index);
 2267         if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
 2268                 reddst6.s6_addr16[1] = htons(ifp->if_index);
 2269 
 2270         /* validation */
 2271         if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
 2272                 nd6log((LOG_ERR,
 2273                         "ICMP6 redirect sent from %s rejected; "
 2274                         "must be from linklocal\n", ip6_sprintf(&src6)));
 2275                 goto bad;
 2276         }
 2277         if (ip6->ip6_hlim != 255) {
 2278                 nd6log((LOG_ERR,
 2279                         "ICMP6 redirect sent from %s rejected; "
 2280                         "hlim=%d (must be 255)\n",
 2281                         ip6_sprintf(&src6), ip6->ip6_hlim));
 2282                 goto bad;
 2283         }
 2284     {
 2285         /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
 2286         struct sockaddr_in6 sin6;
 2287         struct in6_addr *gw6;
 2288 
 2289         bzero(&sin6, sizeof(sin6));
 2290         sin6.sin6_family = AF_INET6;
 2291         sin6.sin6_len = sizeof(struct sockaddr_in6);
 2292         bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
 2293         rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
 2294         if (rt) {
 2295                 if (rt->rt_gateway == NULL ||
 2296                     rt->rt_gateway->sa_family != AF_INET6) {
 2297                         nd6log((LOG_ERR,
 2298                             "ICMP6 redirect rejected; no route "
 2299                             "with inet6 gateway found for redirect dst: %s\n",
 2300                             icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2301                         RTFREE(rt);
 2302                         goto bad;
 2303                 }
 2304 
 2305                 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
 2306                 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
 2307                         nd6log((LOG_ERR,
 2308                                 "ICMP6 redirect rejected; "
 2309                                 "not equal to gw-for-src=%s (must be same): "
 2310                                 "%s\n",
 2311                                 ip6_sprintf(gw6),
 2312                                 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2313                         RTFREE(rt);
 2314                         goto bad;
 2315                 }
 2316         } else {
 2317                 nd6log((LOG_ERR,
 2318                         "ICMP6 redirect rejected; "
 2319                         "no route found for redirect dst: %s\n",
 2320                         icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2321                 goto bad;
 2322         }
 2323         RTFREE(rt);
 2324         rt = NULL;
 2325     }
 2326         if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
 2327                 nd6log((LOG_ERR,
 2328                         "ICMP6 redirect rejected; "
 2329                         "redirect dst must be unicast: %s\n",
 2330                         icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2331                 goto bad;
 2332         }
 2333 
 2334         is_router = is_onlink = 0;
 2335         if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
 2336                 is_router = 1;  /* router case */
 2337         if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
 2338                 is_onlink = 1;  /* on-link destination case */
 2339         if (!is_router && !is_onlink) {
 2340                 nd6log((LOG_ERR,
 2341                         "ICMP6 redirect rejected; "
 2342                         "neither router case nor onlink case: %s\n",
 2343                         icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2344                 goto bad;
 2345         }
 2346         /* validation passed */
 2347 
 2348         icmp6len -= sizeof(*nd_rd);
 2349         nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
 2350         if (nd6_options(&ndopts) < 0) {
 2351                 nd6log((LOG_INFO, "icmp6_redirect_input: "
 2352                         "invalid ND option, rejected: %s\n",
 2353                         icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2354                 /* nd6_options have incremented stats */
 2355                 goto freeit;
 2356         }
 2357 
 2358         if (ndopts.nd_opts_tgt_lladdr) {
 2359                 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
 2360                 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
 2361         }
 2362 
 2363         if (ndopts.nd_opts_rh) {
 2364                 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
 2365                 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
 2366         }
 2367 
 2368         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
 2369                 nd6log((LOG_INFO,
 2370                         "icmp6_redirect_input: lladdrlen mismatch for %s "
 2371                         "(if %d, icmp6 packet %d): %s\n",
 2372                         ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
 2373                         icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2374                 goto bad;
 2375         }
 2376 
 2377         /* RFC 2461 8.3 */
 2378         nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
 2379                          is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
 2380 
 2381         if (!is_onlink) {       /* better router case.  perform rtredirect. */
 2382                 /* perform rtredirect */
 2383                 struct sockaddr_in6 sdst;
 2384                 struct sockaddr_in6 sgw;
 2385                 struct sockaddr_in6 ssrc;
 2386 
 2387                 bzero(&sdst, sizeof(sdst));
 2388                 bzero(&sgw, sizeof(sgw));
 2389                 bzero(&ssrc, sizeof(ssrc));
 2390                 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
 2391                 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
 2392                         sizeof(struct sockaddr_in6);
 2393                 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
 2394                 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
 2395                 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
 2396                 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
 2397                            (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
 2398                            (struct sockaddr *)&ssrc,
 2399                            (struct rtentry **)NULL);
 2400         }
 2401         /* finally update cached route in each socket via pfctlinput */
 2402     {
 2403         struct sockaddr_in6 sdst;
 2404 
 2405         bzero(&sdst, sizeof(sdst));
 2406         sdst.sin6_family = AF_INET6;
 2407         sdst.sin6_len = sizeof(struct sockaddr_in6);
 2408         bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
 2409         pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
 2410 #ifdef IPSEC
 2411         key_sa_routechange((struct sockaddr *)&sdst);
 2412 #endif
 2413     }
 2414 
 2415  freeit:
 2416         m_freem(m);
 2417         return;
 2418 
 2419  bad:
 2420         icmp6stat.icp6s_badredirect++;
 2421         m_freem(m);
 2422 }
 2423 
 2424 void
 2425 icmp6_redirect_output(m0, rt)
 2426         struct mbuf *m0;
 2427         struct rtentry *rt;
 2428 {
 2429         struct ifnet *ifp;      /* my outgoing interface */
 2430         struct in6_addr *ifp_ll6;
 2431         struct in6_addr *router_ll6;
 2432         struct ip6_hdr *sip6;   /* m0 as struct ip6_hdr */
 2433         struct mbuf *m = NULL;  /* newly allocated one */
 2434         struct ip6_hdr *ip6;    /* m as struct ip6_hdr */
 2435         struct nd_redirect *nd_rd;
 2436         size_t maxlen;
 2437         u_char *p;
 2438         struct ifnet *outif = NULL;
 2439         struct sockaddr_in6 src_sa;
 2440 
 2441         icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
 2442 
 2443         /* if we are not router, we don't send icmp6 redirect */
 2444         if (!ip6_forwarding || ip6_accept_rtadv)
 2445                 goto fail;
 2446 
 2447         /* sanity check */
 2448         if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
 2449                 goto fail;
 2450 
 2451         /*
 2452          * Address check:
 2453          *  the source address must identify a neighbor, and
 2454          *  the destination address must not be a multicast address
 2455          *  [RFC 2461, sec 8.2]
 2456          */
 2457         sip6 = mtod(m0, struct ip6_hdr *);
 2458         bzero(&src_sa, sizeof(src_sa));
 2459         src_sa.sin6_family = AF_INET6;
 2460         src_sa.sin6_len = sizeof(src_sa);
 2461         src_sa.sin6_addr = sip6->ip6_src;
 2462         /* we don't currently use sin6_scope_id, but eventually use it */
 2463         src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
 2464         if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
 2465                 goto fail;
 2466         if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
 2467                 goto fail;      /* what should we do here? */
 2468 
 2469         /* rate limit */
 2470         if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
 2471                 goto fail;
 2472 
 2473         /*
 2474          * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
 2475          * we almost always ask for an mbuf cluster for simplicity.
 2476          * (MHLEN < IPV6_MMTU is almost always true)
 2477          */
 2478 #if IPV6_MMTU >= MCLBYTES
 2479 # error assumption failed about IPV6_MMTU and MCLBYTES
 2480 #endif
 2481         MGETHDR(m, M_DONTWAIT, MT_HEADER);
 2482         if (m && IPV6_MMTU >= MHLEN)
 2483                 MCLGET(m, M_DONTWAIT);
 2484         if (!m)
 2485                 goto fail;
 2486         m->m_pkthdr.rcvif = NULL;
 2487         m->m_len = 0;
 2488         maxlen = M_TRAILINGSPACE(m);
 2489         maxlen = min(IPV6_MMTU, maxlen);
 2490         /* just for safety */
 2491         if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
 2492             ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
 2493                 goto fail;
 2494         }
 2495 
 2496         {
 2497                 /* get ip6 linklocal address for ifp(my outgoing interface). */
 2498                 struct in6_ifaddr *ia;
 2499                 if ((ia = in6ifa_ifpforlinklocal(ifp,
 2500                                                  IN6_IFF_NOTREADY|
 2501                                                  IN6_IFF_ANYCAST)) == NULL)
 2502                         goto fail;
 2503                 ifp_ll6 = &ia->ia_addr.sin6_addr;
 2504         }
 2505 
 2506         /* get ip6 linklocal address for the router. */
 2507         if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
 2508                 struct sockaddr_in6 *sin6;
 2509                 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
 2510                 router_ll6 = &sin6->sin6_addr;
 2511                 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
 2512                         router_ll6 = (struct in6_addr *)NULL;
 2513         } else
 2514                 router_ll6 = (struct in6_addr *)NULL;
 2515 
 2516         /* ip6 */
 2517         ip6 = mtod(m, struct ip6_hdr *);
 2518         ip6->ip6_flow = 0;
 2519         ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
 2520         ip6->ip6_vfc |= IPV6_VERSION;
 2521         /* ip6->ip6_plen will be set later */
 2522         ip6->ip6_nxt = IPPROTO_ICMPV6;
 2523         ip6->ip6_hlim = 255;
 2524         /* ip6->ip6_src must be linklocal addr for my outgoing if. */
 2525         bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
 2526         bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
 2527 
 2528         /* ND Redirect */
 2529         nd_rd = (struct nd_redirect *)(ip6 + 1);
 2530         nd_rd->nd_rd_type = ND_REDIRECT;
 2531         nd_rd->nd_rd_code = 0;
 2532         nd_rd->nd_rd_reserved = 0;
 2533         if (rt->rt_flags & RTF_GATEWAY) {
 2534                 /*
 2535                  * nd_rd->nd_rd_target must be a link-local address in
 2536                  * better router cases.
 2537                  */
 2538                 if (!router_ll6)
 2539                         goto fail;
 2540                 bcopy(router_ll6, &nd_rd->nd_rd_target,
 2541                       sizeof(nd_rd->nd_rd_target));
 2542                 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
 2543                       sizeof(nd_rd->nd_rd_dst));
 2544         } else {
 2545                 /* make sure redtgt == reddst */
 2546                 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
 2547                       sizeof(nd_rd->nd_rd_target));
 2548                 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
 2549                       sizeof(nd_rd->nd_rd_dst));
 2550         }
 2551 
 2552         p = (u_char *)(nd_rd + 1);
 2553 
 2554         if (!router_ll6)
 2555                 goto nolladdropt;
 2556 
 2557     {
 2558         /* target lladdr option */
 2559         struct rtentry *rt_router = NULL;
 2560         int len;
 2561         struct sockaddr_dl *sdl;
 2562         struct nd_opt_hdr *nd_opt;
 2563         char *lladdr;
 2564 
 2565         rt_router = nd6_lookup(router_ll6, 0, ifp);
 2566         if (!rt_router)
 2567                 goto nolladdropt;
 2568         len = sizeof(*nd_opt) + ifp->if_addrlen;
 2569         len = (len + 7) & ~7;   /* round by 8 */
 2570         /* safety check */
 2571         if (len + (p - (u_char *)ip6) > maxlen)
 2572                 goto nolladdropt;
 2573         if (!(rt_router->rt_flags & RTF_GATEWAY) &&
 2574             (rt_router->rt_flags & RTF_LLINFO) &&
 2575             (rt_router->rt_gateway->sa_family == AF_LINK) &&
 2576             (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
 2577             sdl->sdl_alen) {
 2578                 nd_opt = (struct nd_opt_hdr *)p;
 2579                 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
 2580                 nd_opt->nd_opt_len = len >> 3;
 2581                 lladdr = (char *)(nd_opt + 1);
 2582                 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
 2583                 p += len;
 2584         }
 2585     }
 2586 nolladdropt:;
 2587 
 2588         m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
 2589 
 2590         /* just to be safe */
 2591 #ifdef M_DECRYPTED      /*not openbsd*/
 2592         if (m0->m_flags & M_DECRYPTED)
 2593                 goto noredhdropt;
 2594 #endif
 2595         if (p - (u_char *)ip6 > maxlen)
 2596                 goto noredhdropt;
 2597 
 2598     {
 2599         /* redirected header option */
 2600         int len;
 2601         struct nd_opt_rd_hdr *nd_opt_rh;
 2602 
 2603         /*
 2604          * compute the maximum size for icmp6 redirect header option.
 2605          * XXX room for auth header?
 2606          */
 2607         len = maxlen - (p - (u_char *)ip6);
 2608         len &= ~7;
 2609 
 2610         /* This is just for simplicity. */
 2611         if (m0->m_pkthdr.len != m0->m_len) {
 2612                 if (m0->m_next) {
 2613                         m_freem(m0->m_next);
 2614                         m0->m_next = NULL;
 2615                 }
 2616                 m0->m_pkthdr.len = m0->m_len;
 2617         }
 2618 
 2619         /*
 2620          * Redirected header option spec (RFC2461 4.6.3) talks nothing
 2621          * about padding/truncate rule for the original IP packet.
 2622          * From the discussion on IPv6imp in Feb 1999, the consensus was:
 2623          * - "attach as much as possible" is the goal
 2624          * - pad if not aligned (original size can be guessed by original
 2625          *   ip6 header)
 2626          * Following code adds the padding if it is simple enough,
 2627          * and truncates if not.
 2628          */
 2629         if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
 2630                 panic("assumption failed in %s:%d", __FILE__, __LINE__);
 2631 
 2632         if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
 2633                 /* not enough room, truncate */
 2634                 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
 2635         } else {
 2636                 /* enough room, pad or truncate */
 2637                 size_t extra;
 2638 
 2639                 extra = m0->m_pkthdr.len % 8;
 2640                 if (extra) {
 2641                         /* pad if easy enough, truncate if not */
 2642                         if (8 - extra <= M_TRAILINGSPACE(m0)) {
 2643                                 /* pad */
 2644                                 m0->m_len += (8 - extra);
 2645                                 m0->m_pkthdr.len += (8 - extra);
 2646                         } else {
 2647                                 /* truncate */
 2648                                 m0->m_pkthdr.len -= extra;
 2649                                 m0->m_len -= extra;
 2650                         }
 2651                 }
 2652                 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
 2653                 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
 2654         }
 2655 
 2656         nd_opt_rh = (struct nd_opt_rd_hdr *)p;
 2657         bzero(nd_opt_rh, sizeof(*nd_opt_rh));
 2658         nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
 2659         nd_opt_rh->nd_opt_rh_len = len >> 3;
 2660         p += sizeof(*nd_opt_rh);
 2661         m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
 2662 
 2663         /* connect m0 to m */
 2664         m_tag_delete_chain(m0, NULL);
 2665         m0->m_flags &= ~M_PKTHDR;
 2666         m->m_next = m0;
 2667         m->m_pkthdr.len = m->m_len + m0->m_len;
 2668         m0 = NULL;
 2669     }
 2670 noredhdropt:;
 2671         if (m0) {
 2672                 m_freem(m0);
 2673                 m0 = NULL;
 2674         }
 2675 
 2676         if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
 2677                 sip6->ip6_src.s6_addr16[1] = 0;
 2678         if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
 2679                 sip6->ip6_dst.s6_addr16[1] = 0;
 2680 #if 0
 2681         if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
 2682                 ip6->ip6_src.s6_addr16[1] = 0;
 2683         if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
 2684                 ip6->ip6_dst.s6_addr16[1] = 0;
 2685 #endif
 2686         if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
 2687                 nd_rd->nd_rd_target.s6_addr16[1] = 0;
 2688         if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
 2689                 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
 2690 
 2691         ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
 2692 
 2693         nd_rd->nd_rd_cksum = 0;
 2694         nd_rd->nd_rd_cksum
 2695                 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
 2696 
 2697         /* send the packet to outside... */
 2698         ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
 2699         if (outif) {
 2700                 icmp6_ifstat_inc(outif, ifs6_out_msg);
 2701                 icmp6_ifstat_inc(outif, ifs6_out_redirect);
 2702         }
 2703         icmp6stat.icp6s_outhist[ND_REDIRECT]++;
 2704 
 2705         return;
 2706 
 2707 fail:
 2708         if (m)
 2709                 m_freem(m);
 2710         if (m0)
 2711                 m_freem(m0);
 2712 }
 2713 
 2714 #ifdef HAVE_NRL_INPCB
 2715 #define sotoin6pcb      sotoinpcb
 2716 #define in6pcb          inpcb
 2717 #define in6p_icmp6filt  inp_icmp6filt
 2718 #endif
 2719 /*
 2720  * ICMPv6 socket option processing.
 2721  */
 2722 int
 2723 icmp6_ctloutput(so, sopt)
 2724         struct socket *so;
 2725         struct sockopt *sopt;
 2726 {
 2727         int error = 0;
 2728         int optlen;
 2729         struct inpcb *inp = sotoinpcb(so);
 2730         int level, op, optname;
 2731 
 2732         if (sopt) {
 2733                 level = sopt->sopt_level;
 2734                 op = sopt->sopt_dir;
 2735                 optname = sopt->sopt_name;
 2736                 optlen = sopt->sopt_valsize;
 2737         } else
 2738                 level = op = optname = optlen = 0;
 2739 
 2740         if (level != IPPROTO_ICMPV6) {
 2741                 return EINVAL;
 2742         }
 2743 
 2744         switch (op) {
 2745         case PRCO_SETOPT:
 2746                 switch (optname) {
 2747                 case ICMP6_FILTER:
 2748                     {
 2749                         struct icmp6_filter *p;
 2750 
 2751                         if (optlen != sizeof(*p)) {
 2752                                 error = EMSGSIZE;
 2753                                 break;
 2754                         }
 2755                         if (inp->in6p_icmp6filt == NULL) {
 2756                                 error = EINVAL;
 2757                                 break;
 2758                         }
 2759                         error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
 2760                                 optlen);
 2761                         break;
 2762                     }
 2763 
 2764                 default:
 2765                         error = ENOPROTOOPT;
 2766                         break;
 2767                 }
 2768                 break;
 2769 
 2770         case PRCO_GETOPT:
 2771                 switch (optname) {
 2772                 case ICMP6_FILTER:
 2773                     {
 2774                         if (inp->in6p_icmp6filt == NULL) {
 2775                                 error = EINVAL;
 2776                                 break;
 2777                         }
 2778                         error = sooptcopyout(sopt, inp->in6p_icmp6filt,
 2779                                 sizeof(struct icmp6_filter));
 2780                         break;
 2781                     }
 2782 
 2783                 default:
 2784                         error = ENOPROTOOPT;
 2785                         break;
 2786                 }
 2787                 break;
 2788         }
 2789 
 2790         return(error);
 2791 }
 2792 #ifdef HAVE_NRL_INPCB
 2793 #undef sotoin6pcb
 2794 #undef in6pcb
 2795 #undef in6p_icmp6filt
 2796 #endif
 2797 
 2798 #ifndef HAVE_PPSRATECHECK
 2799 #ifndef timersub
 2800 #define timersub(tvp, uvp, vvp)                                         \
 2801         do {                                                            \
 2802                 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;          \
 2803                 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;       \
 2804                 if ((vvp)->tv_usec < 0) {                               \
 2805                         (vvp)->tv_sec--;                                \
 2806                         (vvp)->tv_usec += 1000000;                      \
 2807                 }                                                       \
 2808         } while (0)
 2809 #endif
 2810 
 2811 /*
 2812  * ppsratecheck(): packets (or events) per second limitation.
 2813  */
 2814 static int
 2815 ppsratecheck(lasttime, curpps, maxpps)
 2816         struct timeval *lasttime;
 2817         int *curpps;
 2818         int maxpps;     /* maximum pps allowed */
 2819 {
 2820         struct timeval tv, delta;
 2821         int s, rv;
 2822 
 2823         s = splclock(); 
 2824         microtime(&tv);
 2825         splx(s);
 2826 
 2827         timersub(&tv, lasttime, &delta);
 2828 
 2829         /*
 2830          * Check for 0,0 so that the message will be seen at least once.
 2831          * If more than one second has passed since the last update of
 2832          * lasttime, reset the counter.
 2833          *
 2834          * We do increment *curpps even in *curpps < maxpps case, as some may
 2835          * try to use *curpps for stat purposes as well.
 2836          */
 2837         if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
 2838             delta.tv_sec >= 1) {
 2839                 *lasttime = tv;
 2840                 *curpps = 0;
 2841                 rv = 1;
 2842         } else if (maxpps < 0)
 2843                 rv = 1;
 2844         else if (*curpps < maxpps)
 2845                 rv = 1;
 2846         else
 2847                 rv = 0;
 2848 
 2849 #if 1 /* DIAGNOSTIC? */
 2850         /* be careful about wrap-around */
 2851         if (*curpps + 1 > *curpps)
 2852                 *curpps = *curpps + 1;
 2853 #else
 2854         /*
 2855          * assume that there's not too many calls to this function.
 2856          * not sure if the assumption holds, as it depends on *caller's*
 2857          * behavior, not the behavior of this function.
 2858          * IMHO it is wrong to make assumption on the caller's behavior,
 2859          * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
 2860          */
 2861         *curpps = *curpps + 1;
 2862 #endif
 2863 
 2864         return (rv);
 2865 }
 2866 #endif
 2867 
 2868 /*
 2869  * Perform rate limit check.
 2870  * Returns 0 if it is okay to send the icmp6 packet.
 2871  * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
 2872  * limitation.
 2873  *
 2874  * XXX per-destination/type check necessary?
 2875  */
 2876 static int
 2877 icmp6_ratelimit(dst, type, code)
 2878         const struct in6_addr *dst;     /* not used at this moment */
 2879         const int type;                 /* not used at this moment */
 2880         const int code;                 /* not used at this moment */
 2881 {
 2882         int ret;
 2883 
 2884         ret = 0;        /* okay to send */
 2885 
 2886         /* PPS limit */
 2887         if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
 2888             icmp6errppslim)) {
 2889                 /* The packet is subject to rate limit */
 2890                 ret++;
 2891         }
 2892 
 2893         return ret;
 2894 }

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