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


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/icmp6.c

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $
   30  */
   31 
   32 /*-
   33  * Copyright (c) 1982, 1986, 1988, 1993
   34  *      The Regents of the University of California.  All rights reserved.
   35  *
   36  * Redistribution and use in source and binary forms, with or without
   37  * modification, are permitted provided that the following conditions
   38  * are met:
   39  * 1. Redistributions of source code must retain the above copyright
   40  *    notice, this list of conditions and the following disclaimer.
   41  * 2. Redistributions in binary form must reproduce the above copyright
   42  *    notice, this list of conditions and the following disclaimer in the
   43  *    documentation and/or other materials provided with the distribution.
   44  * 4. Neither the name of the University nor the names of its contributors
   45  *    may be used to endorse or promote products derived from this software
   46  *    without specific prior written permission.
   47  *
   48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   58  * SUCH DAMAGE.
   59  *
   60  *      @(#)ip_icmp.c   8.2 (Berkeley) 1/4/94
   61  */
   62 
   63 #include <sys/cdefs.h>
   64 __FBSDID("$FreeBSD$");
   65 
   66 #define MBUF_PRIVATE    /* XXXRW: Optimisation tries to avoid M_EXT mbufs */
   67 
   68 #include "opt_inet.h"
   69 #include "opt_inet6.h"
   70 
   71 #include <sys/param.h>
   72 #include <sys/domain.h>
   73 #include <sys/jail.h>
   74 #include <sys/kernel.h>
   75 #include <sys/lock.h>
   76 #include <sys/malloc.h>
   77 #include <sys/mbuf.h>
   78 #include <sys/proc.h>
   79 #include <sys/protosw.h>
   80 #include <sys/signalvar.h>
   81 #include <sys/socket.h>
   82 #include <sys/socketvar.h>
   83 #include <sys/sx.h>
   84 #include <sys/syslog.h>
   85 #include <sys/systm.h>
   86 #include <sys/time.h>
   87 
   88 #include <net/if.h>
   89 #include <net/if_var.h>
   90 #include <net/if_dl.h>
   91 #include <net/if_llatbl.h>
   92 #include <net/if_types.h>
   93 #include <net/route.h>
   94 #include <net/vnet.h>
   95 
   96 #include <netinet/in.h>
   97 #include <netinet/in_pcb.h>
   98 #include <netinet/in_var.h>
   99 #include <netinet/ip6.h>
  100 #include <netinet/icmp6.h>
  101 #include <netinet/tcp_var.h>
  102 
  103 #include <netinet6/in6_fib.h>
  104 #include <netinet6/in6_ifattach.h>
  105 #include <netinet6/in6_pcb.h>
  106 #include <netinet6/ip6protosw.h>
  107 #include <netinet6/ip6_var.h>
  108 #include <netinet6/scope6_var.h>
  109 #include <netinet6/mld6_var.h>
  110 #include <netinet6/nd6.h>
  111 #include <netinet6/send.h>
  112 
  113 extern struct domain inet6domain;
  114 
  115 VNET_PCPUSTAT_DEFINE(struct icmp6stat, icmp6stat);
  116 VNET_PCPUSTAT_SYSINIT(icmp6stat);
  117 
  118 #ifdef VIMAGE
  119 VNET_PCPUSTAT_SYSUNINIT(icmp6stat);
  120 #endif /* VIMAGE */
  121 
  122 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
  123 VNET_DECLARE(struct inpcbhead, ripcb);
  124 VNET_DECLARE(int, icmp6errppslim);
  125 static VNET_DEFINE(int, icmp6errpps_count) = 0;
  126 static VNET_DEFINE(struct timeval, icmp6errppslim_last);
  127 VNET_DECLARE(int, icmp6_nodeinfo);
  128 
  129 #define V_ripcbinfo                     VNET(ripcbinfo)
  130 #define V_ripcb                         VNET(ripcb)
  131 #define V_icmp6errppslim                VNET(icmp6errppslim)
  132 #define V_icmp6errpps_count             VNET(icmp6errpps_count)
  133 #define V_icmp6errppslim_last           VNET(icmp6errppslim_last)
  134 #define V_icmp6_nodeinfo                VNET(icmp6_nodeinfo)
  135 
  136 static void icmp6_errcount(int, int);
  137 static int icmp6_rip6_input(struct mbuf **, int);
  138 static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
  139 static const char *icmp6_redirect_diag(struct in6_addr *,
  140         struct in6_addr *, struct in6_addr *);
  141 static struct mbuf *ni6_input(struct mbuf *, int, struct prison *);
  142 static struct mbuf *ni6_nametodns(const char *, int, int);
  143 static int ni6_dnsmatch(const char *, int, const char *, int);
  144 static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *,
  145                           struct ifnet **, struct in6_addr *);
  146 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
  147                                 struct ifnet *, int);
  148 static int icmp6_notify_error(struct mbuf **, int, int, int);
  149 
  150 /*
  151  * Kernel module interface for updating icmp6stat.  The argument is an index
  152  * into icmp6stat treated as an array of u_quad_t.  While this encodes the
  153  * general layout of icmp6stat into the caller, it doesn't encode its
  154  * location, so that future changes to add, for example, per-CPU stats
  155  * support won't cause binary compatibility problems for kernel modules.
  156  */
  157 void
  158 kmod_icmp6stat_inc(int statnum)
  159 {
  160 
  161         counter_u64_add(VNET(icmp6stat)[statnum], 1);
  162 }
  163 
  164 static void
  165 icmp6_errcount(int type, int code)
  166 {
  167         switch (type) {
  168         case ICMP6_DST_UNREACH:
  169                 switch (code) {
  170                 case ICMP6_DST_UNREACH_NOROUTE:
  171                         ICMP6STAT_INC(icp6s_odst_unreach_noroute);
  172                         return;
  173                 case ICMP6_DST_UNREACH_ADMIN:
  174                         ICMP6STAT_INC(icp6s_odst_unreach_admin);
  175                         return;
  176                 case ICMP6_DST_UNREACH_BEYONDSCOPE:
  177                         ICMP6STAT_INC(icp6s_odst_unreach_beyondscope);
  178                         return;
  179                 case ICMP6_DST_UNREACH_ADDR:
  180                         ICMP6STAT_INC(icp6s_odst_unreach_addr);
  181                         return;
  182                 case ICMP6_DST_UNREACH_NOPORT:
  183                         ICMP6STAT_INC(icp6s_odst_unreach_noport);
  184                         return;
  185                 }
  186                 break;
  187         case ICMP6_PACKET_TOO_BIG:
  188                 ICMP6STAT_INC(icp6s_opacket_too_big);
  189                 return;
  190         case ICMP6_TIME_EXCEEDED:
  191                 switch (code) {
  192                 case ICMP6_TIME_EXCEED_TRANSIT:
  193                         ICMP6STAT_INC(icp6s_otime_exceed_transit);
  194                         return;
  195                 case ICMP6_TIME_EXCEED_REASSEMBLY:
  196                         ICMP6STAT_INC(icp6s_otime_exceed_reassembly);
  197                         return;
  198                 }
  199                 break;
  200         case ICMP6_PARAM_PROB:
  201                 switch (code) {
  202                 case ICMP6_PARAMPROB_HEADER:
  203                         ICMP6STAT_INC(icp6s_oparamprob_header);
  204                         return;
  205                 case ICMP6_PARAMPROB_NEXTHEADER:
  206                         ICMP6STAT_INC(icp6s_oparamprob_nextheader);
  207                         return;
  208                 case ICMP6_PARAMPROB_OPTION:
  209                         ICMP6STAT_INC(icp6s_oparamprob_option);
  210                         return;
  211                 }
  212                 break;
  213         case ND_REDIRECT:
  214                 ICMP6STAT_INC(icp6s_oredirect);
  215                 return;
  216         }
  217         ICMP6STAT_INC(icp6s_ounknown);
  218 }
  219 
  220 /*
  221  * A wrapper function for icmp6_error() necessary when the erroneous packet
  222  * may not contain enough scope zone information.
  223  */
  224 void
  225 icmp6_error2(struct mbuf *m, int type, int code, int param,
  226     struct ifnet *ifp)
  227 {
  228         struct ip6_hdr *ip6;
  229 
  230         if (ifp == NULL)
  231                 return;
  232 
  233 #ifndef PULLDOWN_TEST
  234         IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
  235 #else
  236         if (m->m_len < sizeof(struct ip6_hdr)) {
  237                 m = m_pullup(m, sizeof(struct ip6_hdr));
  238                 if (m == NULL)
  239                         return;
  240         }
  241 #endif
  242 
  243         ip6 = mtod(m, struct ip6_hdr *);
  244 
  245         if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
  246                 return;
  247         if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
  248                 return;
  249 
  250         icmp6_error(m, type, code, param);
  251 }
  252 
  253 /*
  254  * Generate an error packet of type error in response to bad IP6 packet.
  255  */
  256 void
  257 icmp6_error(struct mbuf *m, int type, int code, int param)
  258 {
  259         struct ip6_hdr *oip6, *nip6;
  260         struct icmp6_hdr *icmp6;
  261         u_int preplen;
  262         int off;
  263         int nxt;
  264 
  265         ICMP6STAT_INC(icp6s_error);
  266 
  267         /* count per-type-code statistics */
  268         icmp6_errcount(type, code);
  269 
  270 #ifdef M_DECRYPTED      /*not openbsd*/
  271         if (m->m_flags & M_DECRYPTED) {
  272                 ICMP6STAT_INC(icp6s_canterror);
  273                 goto freeit;
  274         }
  275 #endif
  276 
  277 #ifndef PULLDOWN_TEST
  278         IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
  279 #else
  280         if (m->m_len < sizeof(struct ip6_hdr)) {
  281                 m = m_pullup(m, sizeof(struct ip6_hdr));
  282                 if (m == NULL)
  283                         return;
  284         }
  285 #endif
  286         oip6 = mtod(m, struct ip6_hdr *);
  287 
  288         /*
  289          * If the destination address of the erroneous packet is a multicast
  290          * address, or the packet was sent using link-layer multicast,
  291          * we should basically suppress sending an error (RFC 2463, Section
  292          * 2.4).
  293          * We have two exceptions (the item e.2 in that section):
  294          * - the Packet Too Big message can be sent for path MTU discovery.
  295          * - the Parameter Problem Message that can be allowed an icmp6 error
  296          *   in the option type field.  This check has been done in
  297          *   ip6_unknown_opt(), so we can just check the type and code.
  298          */
  299         if ((m->m_flags & (M_BCAST|M_MCAST) ||
  300              IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
  301             (type != ICMP6_PACKET_TOO_BIG &&
  302              (type != ICMP6_PARAM_PROB ||
  303               code != ICMP6_PARAMPROB_OPTION)))
  304                 goto freeit;
  305 
  306         /*
  307          * RFC 2463, 2.4 (e.5): source address check.
  308          * XXX: the case of anycast source?
  309          */
  310         if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
  311             IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
  312                 goto freeit;
  313 
  314         /*
  315          * If we are about to send ICMPv6 against ICMPv6 error/redirect,
  316          * don't do it.
  317          */
  318         nxt = -1;
  319         off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
  320         if (off >= 0 && nxt == IPPROTO_ICMPV6) {
  321                 struct icmp6_hdr *icp;
  322 
  323 #ifndef PULLDOWN_TEST
  324                 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
  325                 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
  326 #else
  327                 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
  328                         sizeof(*icp));
  329                 if (icp == NULL) {
  330                         ICMP6STAT_INC(icp6s_tooshort);
  331                         return;
  332                 }
  333 #endif
  334                 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
  335                     icp->icmp6_type == ND_REDIRECT) {
  336                         /*
  337                          * ICMPv6 error
  338                          * Special case: for redirect (which is
  339                          * informational) we must not send icmp6 error.
  340                          */
  341                         ICMP6STAT_INC(icp6s_canterror);
  342                         goto freeit;
  343                 } else {
  344                         /* ICMPv6 informational - send the error */
  345                 }
  346         } else {
  347                 /* non-ICMPv6 - send the error */
  348         }
  349 
  350         oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
  351 
  352         /* Finally, do rate limitation check. */
  353         if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
  354                 ICMP6STAT_INC(icp6s_toofreq);
  355                 goto freeit;
  356         }
  357 
  358         /*
  359          * OK, ICMP6 can be generated.
  360          */
  361 
  362         if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
  363                 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
  364 
  365         preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
  366         M_PREPEND(m, preplen, M_NOWAIT);        /* FIB is also copied over. */
  367         if (m == NULL) {
  368                 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
  369                 return;
  370         }
  371 
  372         nip6 = mtod(m, struct ip6_hdr *);
  373         nip6->ip6_src  = oip6->ip6_src;
  374         nip6->ip6_dst  = oip6->ip6_dst;
  375 
  376         in6_clearscope(&oip6->ip6_src);
  377         in6_clearscope(&oip6->ip6_dst);
  378 
  379         icmp6 = (struct icmp6_hdr *)(nip6 + 1);
  380         icmp6->icmp6_type = type;
  381         icmp6->icmp6_code = code;
  382         icmp6->icmp6_pptr = htonl((u_int32_t)param);
  383 
  384         ICMP6STAT_INC(icp6s_outhist[type]);
  385         icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
  386 
  387         return;
  388 
  389   freeit:
  390         /*
  391          * If we can't tell whether or not we can generate ICMP6, free it.
  392          */
  393         m_freem(m);
  394 }
  395 
  396 /*
  397  * Process a received ICMP6 message.
  398  */
  399 int
  400 icmp6_input(struct mbuf **mp, int *offp, int proto)
  401 {
  402         struct mbuf *m = *mp, *n;
  403         struct ifnet *ifp;
  404         struct ip6_hdr *ip6, *nip6;
  405         struct icmp6_hdr *icmp6, *nicmp6;
  406         int off = *offp;
  407         int icmp6len = m->m_pkthdr.len - *offp;
  408         int code, sum, noff;
  409         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
  410         int ip6len, error;
  411 
  412         ifp = m->m_pkthdr.rcvif;
  413 
  414 #ifndef PULLDOWN_TEST
  415         IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
  416         /* m might change if M_LOOP.  So, call mtod after this */
  417 #endif
  418 
  419         /*
  420          * Locate icmp6 structure in mbuf, and check
  421          * that not corrupted and of at least minimum length
  422          */
  423 
  424         ip6 = mtod(m, struct ip6_hdr *);
  425         ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
  426         if (icmp6len < sizeof(struct icmp6_hdr)) {
  427                 ICMP6STAT_INC(icp6s_tooshort);
  428                 goto freeit;
  429         }
  430 
  431         /*
  432          * Check multicast group membership.
  433          * Note: SSM filters are not applied for ICMPv6 traffic.
  434          */
  435         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  436                 struct in6_multi        *inm;
  437 
  438                 inm = in6m_lookup(ifp, &ip6->ip6_dst);
  439                 if (inm == NULL) {
  440                         IP6STAT_INC(ip6s_notmember);
  441                         in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
  442                         goto freeit;
  443                 }
  444         }
  445 
  446         /*
  447          * calculate the checksum
  448          */
  449 #ifndef PULLDOWN_TEST
  450         icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
  451 #else
  452         IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
  453         if (icmp6 == NULL) {
  454                 ICMP6STAT_INC(icp6s_tooshort);
  455                 return IPPROTO_DONE;
  456         }
  457 #endif
  458         code = icmp6->icmp6_code;
  459 
  460         if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
  461                 nd6log((LOG_ERR,
  462                     "ICMP6 checksum error(%d|%x) %s\n",
  463                     icmp6->icmp6_type, sum,
  464                     ip6_sprintf(ip6bufs, &ip6->ip6_src)));
  465                 ICMP6STAT_INC(icp6s_checksum);
  466                 goto freeit;
  467         }
  468 
  469         ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
  470         icmp6_ifstat_inc(ifp, ifs6_in_msg);
  471         if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
  472                 icmp6_ifstat_inc(ifp, ifs6_in_error);
  473 
  474         switch (icmp6->icmp6_type) {
  475         case ICMP6_DST_UNREACH:
  476                 icmp6_ifstat_inc(ifp, ifs6_in_dstunreach);
  477                 switch (code) {
  478                 case ICMP6_DST_UNREACH_NOROUTE:
  479                 case ICMP6_DST_UNREACH_ADDR:    /* PRC_HOSTDEAD is a DOS */
  480                         code = PRC_UNREACH_NET;
  481                         break;
  482                 case ICMP6_DST_UNREACH_ADMIN:
  483                         icmp6_ifstat_inc(ifp, ifs6_in_adminprohib);
  484                         code = PRC_UNREACH_ADMIN_PROHIB;
  485                         break;
  486                 case ICMP6_DST_UNREACH_BEYONDSCOPE:
  487                         /* I mean "source address was incorrect." */
  488                         code = PRC_PARAMPROB;
  489                         break;
  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(ifp, ifs6_in_pkttoobig);
  501 
  502                 /* validation is made in icmp6_mtudisc_update */
  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(ifp, ifs6_in_timeexceed);
  515                 switch (code) {
  516                 case ICMP6_TIME_EXCEED_TRANSIT:
  517                         code = PRC_TIMXCEED_INTRANS;
  518                         break;
  519                 case ICMP6_TIME_EXCEED_REASSEMBLY:
  520                         code = PRC_TIMXCEED_REASS;
  521                         break;
  522                 default:
  523                         goto badcode;
  524                 }
  525                 goto deliver;
  526                 break;
  527 
  528         case ICMP6_PARAM_PROB:
  529                 icmp6_ifstat_inc(ifp, ifs6_in_paramprob);
  530                 switch (code) {
  531                 case ICMP6_PARAMPROB_NEXTHEADER:
  532                         code = PRC_UNREACH_PROTOCOL;
  533                         break;
  534                 case ICMP6_PARAMPROB_HEADER:
  535                 case ICMP6_PARAMPROB_OPTION:
  536                         code = PRC_PARAMPROB;
  537                         break;
  538                 default:
  539                         goto badcode;
  540                 }
  541                 goto deliver;
  542                 break;
  543 
  544         case ICMP6_ECHO_REQUEST:
  545                 icmp6_ifstat_inc(ifp, ifs6_in_echo);
  546                 if (code != 0)
  547                         goto badcode;
  548                 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
  549                         /* Give up remote */
  550                         break;
  551                 }
  552                 if (!M_WRITABLE(n)
  553                  || n->m_len < off + sizeof(struct icmp6_hdr)) {
  554                         struct mbuf *n0 = n;
  555                         int n0len;
  556 
  557                         CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN);
  558                         n = m_gethdr(M_NOWAIT, n0->m_type);
  559                         if (n == NULL) {
  560                                 /* Give up remote */
  561                                 m_freem(n0);
  562                                 break;
  563                         }
  564 
  565                         m_move_pkthdr(n, n0);   /* FIB copied. */
  566                         n0len = n0->m_pkthdr.len;       /* save for use below */
  567                         /*
  568                          * Copy IPv6 and ICMPv6 only.
  569                          */
  570                         nip6 = mtod(n, struct ip6_hdr *);
  571                         bcopy(ip6, nip6, sizeof(struct ip6_hdr));
  572                         nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
  573                         bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
  574                         noff = sizeof(struct ip6_hdr);
  575                         /* new mbuf contains only ipv6+icmpv6 headers */
  576                         n->m_len = noff + sizeof(struct icmp6_hdr);
  577                         /*
  578                          * Adjust mbuf.  ip6_plen will be adjusted in
  579                          * ip6_output().
  580                          */
  581                         m_adj(n0, off + sizeof(struct icmp6_hdr));
  582                         /* recalculate complete packet size */
  583                         n->m_pkthdr.len = n0len + (noff - off);
  584                         n->m_next = n0;
  585                 } else {
  586                         IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
  587                             sizeof(*nicmp6));
  588                         noff = off;
  589                 }
  590                 if (n) {
  591                         nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
  592                         nicmp6->icmp6_code = 0;
  593                         ICMP6STAT_INC(icp6s_reflect);
  594                         ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
  595                         icmp6_reflect(n, noff);
  596                 }
  597                 break;
  598 
  599         case ICMP6_ECHO_REPLY:
  600                 icmp6_ifstat_inc(ifp, ifs6_in_echoreply);
  601                 if (code != 0)
  602                         goto badcode;
  603                 break;
  604 
  605         case MLD_LISTENER_QUERY:
  606         case MLD_LISTENER_REPORT:
  607         case MLD_LISTENER_DONE:
  608         case MLDV2_LISTENER_REPORT:
  609                 /*
  610                  * Drop MLD traffic which is not link-local, has a hop limit
  611                  * of greater than 1 hop, or which does not have the
  612                  * IPv6 HBH Router Alert option.
  613                  * As IPv6 HBH options are stripped in ip6_input() we must
  614                  * check an mbuf header flag.
  615                  * XXX Should we also sanity check that these messages
  616                  * were directed to a link-local multicast prefix?
  617                  */
  618                 if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0)
  619                         goto freeit;
  620                 if (mld_input(m, off, icmp6len) != 0)
  621                         return (IPPROTO_DONE);
  622                 /* m stays. */
  623                 break;
  624 
  625         case ICMP6_WRUREQUEST:  /* ICMP6_FQDN_QUERY */
  626             {
  627                 enum { WRU, FQDN } mode;
  628                 struct prison *pr;
  629 
  630                 if (!V_icmp6_nodeinfo)
  631                         break;
  632 
  633                 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
  634                         mode = WRU;
  635                 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
  636                         mode = FQDN;
  637                 else
  638                         goto badlen;
  639 
  640                 pr = NULL;
  641                 sx_slock(&allprison_lock);
  642                 TAILQ_FOREACH(pr, &allprison, pr_list)
  643                         if (pr->pr_vnet == ifp->if_vnet)
  644                                 break; 
  645                 sx_sunlock(&allprison_lock);
  646                 if (pr == NULL)
  647                         pr = curthread->td_ucred->cr_prison;
  648                 if (mode == FQDN) {
  649 #ifndef PULLDOWN_TEST
  650                         IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
  651                             IPPROTO_DONE);
  652 #endif
  653                         n = m_copy(m, 0, M_COPYALL);
  654                         if (n)
  655                                 n = ni6_input(n, off, pr);
  656                         /* XXX meaningless if n == NULL */
  657                         noff = sizeof(struct ip6_hdr);
  658                 } else {
  659                         u_char *p;
  660                         int maxhlen, hlen;
  661 
  662                         /*
  663                          * XXX: this combination of flags is pointless,
  664                          * but should we keep this for compatibility?
  665                          */
  666                         if ((V_icmp6_nodeinfo & (ICMP6_NODEINFO_FQDNOK |
  667                             ICMP6_NODEINFO_TMPADDROK)) !=
  668                             (ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK))
  669                                 break;
  670 
  671                         if (code != 0)
  672                                 goto badcode;
  673 
  674                         CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN);
  675                         n = m_gethdr(M_NOWAIT, m->m_type);
  676                         if (n == NULL) {
  677                                 /* Give up remote */
  678                                 break;
  679                         }
  680                         if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
  681                                 /*
  682                                  * Previous code did a blind M_COPY_PKTHDR
  683                                  * and said "just for rcvif".  If true, then
  684                                  * we could tolerate the dup failing (due to
  685                                  * the deep copy of the tag chain).  For now
  686                                  * be conservative and just fail.
  687                                  */
  688                                 m_free(n);
  689                                 n = NULL;
  690                                 break;
  691                         }
  692                         /*
  693                          * Copy IPv6 and ICMPv6 only.
  694                          */
  695                         nip6 = mtod(n, struct ip6_hdr *);
  696                         bcopy(ip6, nip6, sizeof(struct ip6_hdr));
  697                         nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
  698                         bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
  699                         p = (u_char *)(nicmp6 + 1);
  700                         bzero(p, 4);
  701 
  702                         maxhlen = M_TRAILINGSPACE(n) -
  703                             (sizeof(*nip6) + sizeof(*nicmp6) + 4);
  704                         mtx_lock(&pr->pr_mtx);
  705                         hlen = strlen(pr->pr_hostname);
  706                         if (maxhlen > hlen)
  707                                 maxhlen = hlen;
  708                         /* meaningless TTL */
  709                         bcopy(pr->pr_hostname, p + 4, maxhlen);
  710                         mtx_unlock(&pr->pr_mtx);
  711                         noff = sizeof(struct ip6_hdr);
  712                         n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
  713                                 sizeof(struct icmp6_hdr) + 4 + maxhlen;
  714                         nicmp6->icmp6_type = ICMP6_WRUREPLY;
  715                         nicmp6->icmp6_code = 0;
  716                 }
  717                 if (n) {
  718                         ICMP6STAT_INC(icp6s_reflect);
  719                         ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
  720                         icmp6_reflect(n, noff);
  721                 }
  722                 break;
  723             }
  724 
  725         case ICMP6_WRUREPLY:
  726                 if (code != 0)
  727                         goto badcode;
  728                 break;
  729 
  730         case ND_ROUTER_SOLICIT:
  731                 icmp6_ifstat_inc(ifp, ifs6_in_routersolicit);
  732                 if (code != 0)
  733                         goto badcode;
  734                 if (icmp6len < sizeof(struct nd_router_solicit))
  735                         goto badlen;
  736                 if (send_sendso_input_hook != NULL) {
  737                         IP6_EXTHDR_CHECK(m, off, icmp6len, IPPROTO_DONE);
  738                         error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
  739                         if (error == 0) {
  740                                 m = NULL;
  741                                 goto freeit;
  742                         }
  743                 }
  744                 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
  745                 nd6_rs_input(m, off, icmp6len);
  746                 m = n;
  747                 if (m == NULL)
  748                         goto freeit;
  749                 break;
  750 
  751         case ND_ROUTER_ADVERT:
  752                 icmp6_ifstat_inc(ifp, ifs6_in_routeradvert);
  753                 if (code != 0)
  754                         goto badcode;
  755                 if (icmp6len < sizeof(struct nd_router_advert))
  756                         goto badlen;
  757                 if (send_sendso_input_hook != NULL) {
  758                         error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
  759                         if (error == 0) {
  760                                 m = NULL;
  761                                 goto freeit;
  762                         }
  763                 }
  764                 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
  765                 nd6_ra_input(m, off, icmp6len);
  766                 m = n;
  767                 if (m == NULL)
  768                         goto freeit;
  769                 break;
  770 
  771         case ND_NEIGHBOR_SOLICIT:
  772                 icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit);
  773                 if (code != 0)
  774                         goto badcode;
  775                 if (icmp6len < sizeof(struct nd_neighbor_solicit))
  776                         goto badlen;
  777                 if (send_sendso_input_hook != NULL) {
  778                         error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
  779                         if (error == 0) {
  780                                 m = NULL;
  781                                 goto freeit;
  782                         }
  783                 }
  784                 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
  785                 nd6_ns_input(m, off, icmp6len);
  786                 m = n;
  787                 if (m == NULL)
  788                         goto freeit;
  789                 break;
  790 
  791         case ND_NEIGHBOR_ADVERT:
  792                 icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert);
  793                 if (code != 0)
  794                         goto badcode;
  795                 if (icmp6len < sizeof(struct nd_neighbor_advert))
  796                         goto badlen;
  797                 if (send_sendso_input_hook != NULL) {
  798                         error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
  799                         if (error == 0) {
  800                                 m = NULL;
  801                                 goto freeit;
  802                         }
  803                 }
  804                 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
  805                 nd6_na_input(m, off, icmp6len);
  806                 m = n;
  807                 if (m == NULL)
  808                         goto freeit;
  809                 break;
  810 
  811         case ND_REDIRECT:
  812                 icmp6_ifstat_inc(ifp, ifs6_in_redirect);
  813                 if (code != 0)
  814                         goto badcode;
  815                 if (icmp6len < sizeof(struct nd_redirect))
  816                         goto badlen;
  817                 if (send_sendso_input_hook != NULL) {
  818                         error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
  819                         if (error == 0) {
  820                                 m = NULL;
  821                                 goto freeit;
  822                         }
  823                 }
  824                 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
  825                 icmp6_redirect_input(m, off);
  826                 m = n;
  827                 if (m == NULL)
  828                         goto freeit;
  829                 break;
  830 
  831         case ICMP6_ROUTER_RENUMBERING:
  832                 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
  833                     code != ICMP6_ROUTER_RENUMBERING_RESULT)
  834                         goto badcode;
  835                 if (icmp6len < sizeof(struct icmp6_router_renum))
  836                         goto badlen;
  837                 break;
  838 
  839         default:
  840                 nd6log((LOG_DEBUG,
  841                     "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
  842                     icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
  843                     ip6_sprintf(ip6bufd, &ip6->ip6_dst),
  844                     ifp ? ifp->if_index : 0));
  845                 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
  846                         /* ICMPv6 error: MUST deliver it by spec... */
  847                         code = PRC_NCMDS;
  848                         /* deliver */
  849                 } else {
  850                         /* ICMPv6 informational: MUST not deliver */
  851                         break;
  852                 }
  853         deliver:
  854                 if (icmp6_notify_error(&m, off, icmp6len, code) != 0) {
  855                         /* In this case, m should've been freed. */
  856                         return (IPPROTO_DONE);
  857                 }
  858                 break;
  859 
  860         badcode:
  861                 ICMP6STAT_INC(icp6s_badcode);
  862                 break;
  863 
  864         badlen:
  865                 ICMP6STAT_INC(icp6s_badlen);
  866                 break;
  867         }
  868 
  869         /* deliver the packet to appropriate sockets */
  870         icmp6_rip6_input(&m, *offp);
  871 
  872         *mp = m;
  873         return IPPROTO_DONE;
  874 
  875  freeit:
  876         m_freem(m);
  877         return IPPROTO_DONE;
  878 }
  879 
  880 static int
  881 icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code)
  882 {
  883         struct mbuf *m = *mp;
  884         struct icmp6_hdr *icmp6;
  885         struct ip6_hdr *eip6;
  886         u_int32_t notifymtu;
  887         struct sockaddr_in6 icmp6src, icmp6dst;
  888 
  889         if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
  890                 ICMP6STAT_INC(icp6s_tooshort);
  891                 goto freeit;
  892         }
  893 #ifndef PULLDOWN_TEST
  894         IP6_EXTHDR_CHECK(m, off,
  895             sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
  896         icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
  897 #else
  898         IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
  899             sizeof(*icmp6) + sizeof(struct ip6_hdr));
  900         if (icmp6 == NULL) {
  901                 ICMP6STAT_INC(icp6s_tooshort);
  902                 return (-1);
  903         }
  904 #endif
  905         eip6 = (struct ip6_hdr *)(icmp6 + 1);
  906         bzero(&icmp6dst, sizeof(icmp6dst));
  907 
  908         /* Detect the upper level protocol */
  909         {
  910                 void (*ctlfunc)(int, struct sockaddr *, void *);
  911                 u_int8_t nxt = eip6->ip6_nxt;
  912                 int eoff = off + sizeof(struct icmp6_hdr) +
  913                     sizeof(struct ip6_hdr);
  914                 struct ip6ctlparam ip6cp;
  915                 int icmp6type = icmp6->icmp6_type;
  916                 struct ip6_frag *fh;
  917                 struct ip6_rthdr *rth;
  918                 struct ip6_rthdr0 *rth0;
  919                 int rthlen;
  920 
  921                 while (1) { /* XXX: should avoid infinite loop explicitly? */
  922                         struct ip6_ext *eh;
  923 
  924                         switch (nxt) {
  925                         case IPPROTO_HOPOPTS:
  926                         case IPPROTO_DSTOPTS:
  927                         case IPPROTO_AH:
  928 #ifndef PULLDOWN_TEST
  929                                 IP6_EXTHDR_CHECK(m, 0,
  930                                     eoff + sizeof(struct ip6_ext), -1);
  931                                 eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
  932 #else
  933                                 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
  934                                     eoff, sizeof(*eh));
  935                                 if (eh == NULL) {
  936                                         ICMP6STAT_INC(icp6s_tooshort);
  937                                         return (-1);
  938                                 }
  939 #endif
  940 
  941                                 if (nxt == IPPROTO_AH)
  942                                         eoff += (eh->ip6e_len + 2) << 2;
  943                                 else
  944                                         eoff += (eh->ip6e_len + 1) << 3;
  945                                 nxt = eh->ip6e_nxt;
  946                                 break;
  947                         case IPPROTO_ROUTING:
  948                                 /*
  949                                  * When the erroneous packet contains a
  950                                  * routing header, we should examine the
  951                                  * header to determine the final destination.
  952                                  * Otherwise, we can't properly update
  953                                  * information that depends on the final
  954                                  * destination (e.g. path MTU).
  955                                  */
  956 #ifndef PULLDOWN_TEST
  957                                 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
  958                                 rth = (struct ip6_rthdr *)
  959                                     (mtod(m, caddr_t) + eoff);
  960 #else
  961                                 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
  962                                     eoff, sizeof(*rth));
  963                                 if (rth == NULL) {
  964                                         ICMP6STAT_INC(icp6s_tooshort);
  965                                         return (-1);
  966                                 }
  967 #endif
  968                                 rthlen = (rth->ip6r_len + 1) << 3;
  969                                 /*
  970                                  * XXX: currently there is no
  971                                  * officially defined type other
  972                                  * than type-0.
  973                                  * Note that if the segment left field
  974                                  * is 0, all intermediate hops must
  975                                  * have been passed.
  976                                  */
  977                                 if (rth->ip6r_segleft &&
  978                                     rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
  979                                         int hops;
  980 
  981 #ifndef PULLDOWN_TEST
  982                                         IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
  983                                         rth0 = (struct ip6_rthdr0 *)
  984                                             (mtod(m, caddr_t) + eoff);
  985 #else
  986                                         IP6_EXTHDR_GET(rth0,
  987                                             struct ip6_rthdr0 *, m,
  988                                             eoff, rthlen);
  989                                         if (rth0 == NULL) {
  990                                                 ICMP6STAT_INC(icp6s_tooshort);
  991                                                 return (-1);
  992                                         }
  993 #endif
  994                                         /* just ignore a bogus header */
  995                                         if ((rth0->ip6r0_len % 2) == 0 &&
  996                                             (hops = rth0->ip6r0_len/2))
  997                                                 icmp6dst.sin6_addr = *((struct in6_addr *)(rth0 + 1) + (hops - 1));
  998                                 }
  999                                 eoff += rthlen;
 1000                                 nxt = rth->ip6r_nxt;
 1001                                 break;
 1002                         case IPPROTO_FRAGMENT:
 1003 #ifndef PULLDOWN_TEST
 1004                                 IP6_EXTHDR_CHECK(m, 0, eoff +
 1005                                     sizeof(struct ip6_frag), -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_INC(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_INC(icp6s_tooshort);
 1048                         return (-1);
 1049                 }
 1050 #endif
 1051 
 1052                 /*
 1053                  * retrieve parameters from the inner IPv6 header, and convert
 1054                  * them into sockaddr structures.
 1055                  * XXX: there is no guarantee that the source or destination
 1056                  * addresses of the inner packet are in the same scope as
 1057                  * the addresses of the icmp packet.  But there is no other
 1058                  * way to determine the zone.
 1059                  */
 1060                 eip6 = (struct ip6_hdr *)(icmp6 + 1);
 1061 
 1062                 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
 1063                 icmp6dst.sin6_family = AF_INET6;
 1064                 if (IN6_IS_ADDR_UNSPECIFIED(&icmp6dst.sin6_addr))
 1065                         icmp6dst.sin6_addr = eip6->ip6_dst;
 1066                 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
 1067                         goto freeit;
 1068                 bzero(&icmp6src, sizeof(icmp6src));
 1069                 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
 1070                 icmp6src.sin6_family = AF_INET6;
 1071                 icmp6src.sin6_addr = eip6->ip6_src;
 1072                 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
 1073                         goto freeit;
 1074                 icmp6src.sin6_flowinfo =
 1075                     (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
 1076 
 1077                 ip6cp.ip6c_m = m;
 1078                 ip6cp.ip6c_icmp6 = icmp6;
 1079                 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
 1080                 ip6cp.ip6c_off = eoff;
 1081                 ip6cp.ip6c_finaldst = &icmp6dst.sin6_addr;
 1082                 ip6cp.ip6c_src = &icmp6src;
 1083                 ip6cp.ip6c_nxt = nxt;
 1084 
 1085                 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
 1086                         notifymtu = ntohl(icmp6->icmp6_mtu);
 1087                         ip6cp.ip6c_cmdarg = (void *)&notifymtu;
 1088                         icmp6_mtudisc_update(&ip6cp, 1);        /*XXX*/
 1089                 }
 1090 
 1091                 ctlfunc = (void (*)(int, struct sockaddr *, void *))
 1092                     (inet6sw[ip6_protox[nxt]].pr_ctlinput);
 1093                 if (ctlfunc) {
 1094                         (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
 1095                             &ip6cp);
 1096                 }
 1097         }
 1098         *mp = m;
 1099         return (0);
 1100 
 1101   freeit:
 1102         m_freem(m);
 1103         return (-1);
 1104 }
 1105 
 1106 void
 1107 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
 1108 {
 1109         struct in6_addr *dst = ip6cp->ip6c_finaldst;
 1110         struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
 1111         struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
 1112         u_int mtu = ntohl(icmp6->icmp6_mtu);
 1113         struct in_conninfo inc;
 1114 
 1115 #if 0
 1116         /*
 1117          * RFC2460 section 5, last paragraph.
 1118          * even though minimum link MTU for IPv6 is IPV6_MMTU,
 1119          * we may see ICMPv6 too big with mtu < IPV6_MMTU
 1120          * due to packet translator in the middle.
 1121          * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
 1122          * special handling.
 1123          */
 1124         if (mtu < IPV6_MMTU)
 1125                 return;
 1126 #endif
 1127 
 1128         /*
 1129          * we reject ICMPv6 too big with abnormally small value.
 1130          * XXX what is the good definition of "abnormally small"?
 1131          */
 1132         if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
 1133                 return;
 1134 
 1135         if (!validated)
 1136                 return;
 1137 
 1138         /*
 1139          * In case the suggested mtu is less than IPV6_MMTU, we
 1140          * only need to remember that it was for above mentioned
 1141          * "alwaysfrag" case.
 1142          * Try to be as close to the spec as possible.
 1143          */
 1144         if (mtu < IPV6_MMTU)
 1145                 mtu = IPV6_MMTU - 8;
 1146 
 1147         bzero(&inc, sizeof(inc));
 1148         inc.inc_fibnum = M_GETFIB(m);
 1149         inc.inc_flags |= INC_ISIPV6;
 1150         inc.inc6_faddr = *dst;
 1151         if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
 1152                 return;
 1153 
 1154         if (mtu < tcp_maxmtu6(&inc, NULL)) {
 1155                 tcp_hc_updatemtu(&inc, mtu);
 1156                 ICMP6STAT_INC(icp6s_pmtuchg);
 1157         }
 1158 }
 1159 
 1160 /*
 1161  * Process a Node Information Query packet, based on
 1162  * draft-ietf-ipngwg-icmp-name-lookups-07.
 1163  *
 1164  * Spec incompatibilities:
 1165  * - IPv6 Subject address handling
 1166  * - IPv4 Subject address handling support missing
 1167  * - Proxy reply (answer even if it's not for me)
 1168  * - joins NI group address at in6_ifattach() time only, does not cope
 1169  *   with hostname changes by sethostname(3)
 1170  */
 1171 static struct mbuf *
 1172 ni6_input(struct mbuf *m, int off, struct prison *pr)
 1173 {
 1174         struct icmp6_nodeinfo *ni6, *nni6;
 1175         struct mbuf *n = NULL;
 1176         u_int16_t qtype;
 1177         int subjlen;
 1178         int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
 1179         struct ni_reply_fqdn *fqdn;
 1180         int addrs;              /* for NI_QTYPE_NODEADDR */
 1181         struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
 1182         struct in6_addr in6_subj; /* subject address */
 1183         struct ip6_hdr *ip6;
 1184         int oldfqdn = 0;        /* if 1, return pascal string (03 draft) */
 1185         char *subj = NULL;
 1186         struct in6_ifaddr *ia6 = NULL;
 1187 
 1188         ip6 = mtod(m, struct ip6_hdr *);
 1189 #ifndef PULLDOWN_TEST
 1190         ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
 1191 #else
 1192         IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
 1193         if (ni6 == NULL) {
 1194                 /* m is already reclaimed */
 1195                 return (NULL);
 1196         }
 1197 #endif
 1198 
 1199         /*
 1200          * Validate IPv6 source address.
 1201          * The default configuration MUST be to refuse answering queries from
 1202          * global-scope addresses according to RFC4602.
 1203          * Notes:
 1204          *  - it's not very clear what "refuse" means; this implementation
 1205          *    simply drops it.
 1206          *  - it's not very easy to identify global-scope (unicast) addresses
 1207          *    since there are many prefixes for them.  It should be safer
 1208          *    and in practice sufficient to check "all" but loopback and
 1209          *    link-local (note that site-local unicast was deprecated and
 1210          *    ULA is defined as global scope-wise)
 1211          */
 1212         if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
 1213             !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
 1214             !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
 1215                 goto bad;
 1216 
 1217         /*
 1218          * Validate IPv6 destination address.
 1219          *
 1220          * The Responder must discard the Query without further processing
 1221          * unless it is one of the Responder's unicast or anycast addresses, or
 1222          * a link-local scope multicast address which the Responder has joined.
 1223          * [RFC4602, Section 5.]
 1224          */
 1225         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 1226                 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
 1227                         goto bad;
 1228                 /* else it's a link-local multicast, fine */
 1229         } else {                /* unicast or anycast */
 1230                 ia6 = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
 1231                 if (ia6 == NULL)
 1232                         goto bad; /* XXX impossible */
 1233 
 1234                 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
 1235                     !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
 1236                         ifa_free(&ia6->ia_ifa);
 1237                         nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
 1238                                 "a temporary address in %s:%d",
 1239                                __FILE__, __LINE__));
 1240                         goto bad;
 1241                 }
 1242                 ifa_free(&ia6->ia_ifa);
 1243         }
 1244 
 1245         /* validate query Subject field. */
 1246         qtype = ntohs(ni6->ni_qtype);
 1247         subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
 1248         switch (qtype) {
 1249         case NI_QTYPE_NOOP:
 1250         case NI_QTYPE_SUPTYPES:
 1251                 /* 07 draft */
 1252                 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
 1253                         break;
 1254                 /* FALLTHROUGH */
 1255         case NI_QTYPE_FQDN:
 1256         case NI_QTYPE_NODEADDR:
 1257         case NI_QTYPE_IPV4ADDR:
 1258                 switch (ni6->ni_code) {
 1259                 case ICMP6_NI_SUBJ_IPV6:
 1260 #if ICMP6_NI_SUBJ_IPV6 != 0
 1261                 case 0:
 1262 #endif
 1263                         /*
 1264                          * backward compatibility - try to accept 03 draft
 1265                          * format, where no Subject is present.
 1266                          */
 1267                         if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
 1268                             subjlen == 0) {
 1269                                 oldfqdn++;
 1270                                 break;
 1271                         }
 1272 #if ICMP6_NI_SUBJ_IPV6 != 0
 1273                         if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
 1274                                 goto bad;
 1275 #endif
 1276 
 1277                         if (subjlen != sizeof(struct in6_addr))
 1278                                 goto bad;
 1279 
 1280                         /*
 1281                          * Validate Subject address.
 1282                          *
 1283                          * Not sure what exactly "address belongs to the node"
 1284                          * means in the spec, is it just unicast, or what?
 1285                          *
 1286                          * At this moment we consider Subject address as
 1287                          * "belong to the node" if the Subject address equals
 1288                          * to the IPv6 destination address; validation for
 1289                          * IPv6 destination address should have done enough
 1290                          * check for us.
 1291                          *
 1292                          * We do not do proxy at this moment.
 1293                          */
 1294                         /* m_pulldown instead of copy? */
 1295                         m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
 1296                             subjlen, (caddr_t)&in6_subj);
 1297                         if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
 1298                                 goto bad;
 1299 
 1300                         subj = (char *)&in6_subj;
 1301                         if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
 1302                                 break;
 1303 
 1304                         /*
 1305                          * XXX if we are to allow other cases, we should really
 1306                          * be careful about scope here.
 1307                          * basically, we should disallow queries toward IPv6
 1308                          * destination X with subject Y,
 1309                          * if scope(X) > scope(Y).
 1310                          * if we allow scope(X) > scope(Y), it will result in
 1311                          * information leakage across scope boundary.
 1312                          */
 1313                         goto bad;
 1314 
 1315                 case ICMP6_NI_SUBJ_FQDN:
 1316                         /*
 1317                          * Validate Subject name with gethostname(3).
 1318                          *
 1319                          * The behavior may need some debate, since:
 1320                          * - we are not sure if the node has FQDN as
 1321                          *   hostname (returned by gethostname(3)).
 1322                          * - the code does wildcard match for truncated names.
 1323                          *   however, we are not sure if we want to perform
 1324                          *   wildcard match, if gethostname(3) side has
 1325                          *   truncated hostname.
 1326                          */
 1327                         mtx_lock(&pr->pr_mtx);
 1328                         n = ni6_nametodns(pr->pr_hostname,
 1329                             strlen(pr->pr_hostname), 0);
 1330                         mtx_unlock(&pr->pr_mtx);
 1331                         if (!n || n->m_next || n->m_len == 0)
 1332                                 goto bad;
 1333                         IP6_EXTHDR_GET(subj, char *, m,
 1334                             off + sizeof(struct icmp6_nodeinfo), subjlen);
 1335                         if (subj == NULL)
 1336                                 goto bad;
 1337                         if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
 1338                             n->m_len)) {
 1339                                 goto bad;
 1340                         }
 1341                         m_freem(n);
 1342                         n = NULL;
 1343                         break;
 1344 
 1345                 case ICMP6_NI_SUBJ_IPV4:        /* XXX: to be implemented? */
 1346                 default:
 1347                         goto bad;
 1348                 }
 1349                 break;
 1350         }
 1351 
 1352         /* refuse based on configuration.  XXX ICMP6_NI_REFUSED? */
 1353         switch (qtype) {
 1354         case NI_QTYPE_FQDN:
 1355                 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
 1356                         goto bad;
 1357                 break;
 1358         case NI_QTYPE_NODEADDR:
 1359         case NI_QTYPE_IPV4ADDR:
 1360                 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
 1361                         goto bad;
 1362                 break;
 1363         }
 1364 
 1365         /* guess reply length */
 1366         switch (qtype) {
 1367         case NI_QTYPE_NOOP:
 1368                 break;          /* no reply data */
 1369         case NI_QTYPE_SUPTYPES:
 1370                 replylen += sizeof(u_int32_t);
 1371                 break;
 1372         case NI_QTYPE_FQDN:
 1373                 /* XXX will append an mbuf */
 1374                 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
 1375                 break;
 1376         case NI_QTYPE_NODEADDR:
 1377                 addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
 1378                 if ((replylen += addrs * (sizeof(struct in6_addr) +
 1379                     sizeof(u_int32_t))) > MCLBYTES)
 1380                         replylen = MCLBYTES; /* XXX: will truncate pkt later */
 1381                 break;
 1382         case NI_QTYPE_IPV4ADDR:
 1383                 /* unsupported - should respond with unknown Qtype? */
 1384                 break;
 1385         default:
 1386                 /*
 1387                  * XXX: We must return a reply with the ICMP6 code
 1388                  * `unknown Qtype' in this case.  However we regard the case
 1389                  * as an FQDN query for backward compatibility.
 1390                  * Older versions set a random value to this field,
 1391                  * so it rarely varies in the defined qtypes.
 1392                  * But the mechanism is not reliable...
 1393                  * maybe we should obsolete older versions.
 1394                  */
 1395                 qtype = NI_QTYPE_FQDN;
 1396                 /* XXX will append an mbuf */
 1397                 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
 1398                 oldfqdn++;
 1399                 break;
 1400         }
 1401 
 1402         /* Allocate an mbuf to reply. */
 1403         if (replylen > MCLBYTES) {
 1404                 /*
 1405                  * XXX: should we try to allocate more? But MCLBYTES
 1406                  * is probably much larger than IPV6_MMTU...
 1407                  */
 1408                 goto bad;
 1409         }
 1410         if (replylen > MHLEN)
 1411                 n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR);
 1412         else
 1413                 n = m_gethdr(M_NOWAIT, m->m_type);
 1414         if (n == NULL) {
 1415                 m_freem(m);
 1416                 return (NULL);
 1417         }
 1418         m_move_pkthdr(n, m); /* just for recvif and FIB */
 1419         n->m_pkthdr.len = n->m_len = replylen;
 1420 
 1421         /* copy mbuf header and IPv6 + Node Information base headers */
 1422         bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
 1423         nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
 1424         bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
 1425 
 1426         /* qtype dependent procedure */
 1427         switch (qtype) {
 1428         case NI_QTYPE_NOOP:
 1429                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1430                 nni6->ni_flags = 0;
 1431                 break;
 1432         case NI_QTYPE_SUPTYPES:
 1433         {
 1434                 u_int32_t v;
 1435                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1436                 nni6->ni_flags = htons(0x0000); /* raw bitmap */
 1437                 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
 1438                 v = (u_int32_t)htonl(0x0000000f);
 1439                 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
 1440                 break;
 1441         }
 1442         case NI_QTYPE_FQDN:
 1443                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1444                 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
 1445                     sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
 1446                 nni6->ni_flags = 0; /* XXX: meaningless TTL */
 1447                 fqdn->ni_fqdn_ttl = 0;  /* ditto. */
 1448                 /*
 1449                  * XXX do we really have FQDN in hostname?
 1450                  */
 1451                 mtx_lock(&pr->pr_mtx);
 1452                 n->m_next = ni6_nametodns(pr->pr_hostname,
 1453                     strlen(pr->pr_hostname), oldfqdn);
 1454                 mtx_unlock(&pr->pr_mtx);
 1455                 if (n->m_next == NULL)
 1456                         goto bad;
 1457                 /* XXX we assume that n->m_next is not a chain */
 1458                 if (n->m_next->m_next != NULL)
 1459                         goto bad;
 1460                 n->m_pkthdr.len += n->m_next->m_len;
 1461                 break;
 1462         case NI_QTYPE_NODEADDR:
 1463         {
 1464                 int lenlim, copied;
 1465 
 1466                 nni6->ni_code = ICMP6_NI_SUCCESS;
 1467                 n->m_pkthdr.len = n->m_len =
 1468                     sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
 1469                 lenlim = M_TRAILINGSPACE(n);
 1470                 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
 1471                 /* XXX: reset mbuf length */
 1472                 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
 1473                     sizeof(struct icmp6_nodeinfo) + copied;
 1474                 break;
 1475         }
 1476         default:
 1477                 break;          /* XXX impossible! */
 1478         }
 1479 
 1480         nni6->ni_type = ICMP6_NI_REPLY;
 1481         m_freem(m);
 1482         return (n);
 1483 
 1484   bad:
 1485         m_freem(m);
 1486         if (n)
 1487                 m_freem(n);
 1488         return (NULL);
 1489 }
 1490 
 1491 /*
 1492  * make a mbuf with DNS-encoded string.  no compression support.
 1493  *
 1494  * XXX names with less than 2 dots (like "foo" or "foo.section") will be
 1495  * treated as truncated name (two \0 at the end).  this is a wild guess.
 1496  *
 1497  * old - return pascal string if non-zero
 1498  */
 1499 static struct mbuf *
 1500 ni6_nametodns(const char *name, int namelen, int old)
 1501 {
 1502         struct mbuf *m;
 1503         char *cp, *ep;
 1504         const char *p, *q;
 1505         int i, len, nterm;
 1506 
 1507         if (old)
 1508                 len = namelen + 1;
 1509         else
 1510                 len = MCLBYTES;
 1511 
 1512         /* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */
 1513         if (len > MLEN)
 1514                 m = m_getcl(M_NOWAIT, MT_DATA, 0);
 1515         else
 1516                 m = m_get(M_NOWAIT, MT_DATA);
 1517         if (m == NULL)
 1518                 goto fail;
 1519 
 1520         if (old) {
 1521                 m->m_len = len;
 1522                 *mtod(m, char *) = namelen;
 1523                 bcopy(name, mtod(m, char *) + 1, namelen);
 1524                 return m;
 1525         } else {
 1526                 m->m_len = 0;
 1527                 cp = mtod(m, char *);
 1528                 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
 1529 
 1530                 /* if not certain about my name, return empty buffer */
 1531                 if (namelen == 0)
 1532                         return m;
 1533 
 1534                 /*
 1535                  * guess if it looks like shortened hostname, or FQDN.
 1536                  * shortened hostname needs two trailing "\0".
 1537                  */
 1538                 i = 0;
 1539                 for (p = name; p < name + namelen; p++) {
 1540                         if (*p && *p == '.')
 1541                                 i++;
 1542                 }
 1543                 if (i < 2)
 1544                         nterm = 2;
 1545                 else
 1546                         nterm = 1;
 1547 
 1548                 p = name;
 1549                 while (cp < ep && p < name + namelen) {
 1550                         i = 0;
 1551                         for (q = p; q < name + namelen && *q && *q != '.'; q++)
 1552                                 i++;
 1553                         /* result does not fit into mbuf */
 1554                         if (cp + i + 1 >= ep)
 1555                                 goto fail;
 1556                         /*
 1557                          * DNS label length restriction, RFC1035 page 8.
 1558                          * "i == 0" case is included here to avoid returning
 1559                          * 0-length label on "foo..bar".
 1560                          */
 1561                         if (i <= 0 || i >= 64)
 1562                                 goto fail;
 1563                         *cp++ = i;
 1564                         bcopy(p, cp, i);
 1565                         cp += i;
 1566                         p = q;
 1567                         if (p < name + namelen && *p == '.')
 1568                                 p++;
 1569                 }
 1570                 /* termination */
 1571                 if (cp + nterm >= ep)
 1572                         goto fail;
 1573                 while (nterm-- > 0)
 1574                         *cp++ = '\0';
 1575                 m->m_len = cp - mtod(m, char *);
 1576                 return m;
 1577         }
 1578 
 1579         panic("should not reach here");
 1580         /* NOTREACHED */
 1581 
 1582  fail:
 1583         if (m)
 1584                 m_freem(m);
 1585         return NULL;
 1586 }
 1587 
 1588 /*
 1589  * check if two DNS-encoded string matches.  takes care of truncated
 1590  * form (with \0\0 at the end).  no compression support.
 1591  * XXX upper/lowercase match (see RFC2065)
 1592  */
 1593 static int
 1594 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
 1595 {
 1596         const char *a0, *b0;
 1597         int l;
 1598 
 1599         /* simplest case - need validation? */
 1600         if (alen == blen && bcmp(a, b, alen) == 0)
 1601                 return 1;
 1602 
 1603         a0 = a;
 1604         b0 = b;
 1605 
 1606         /* termination is mandatory */
 1607         if (alen < 2 || blen < 2)
 1608                 return 0;
 1609         if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
 1610                 return 0;
 1611         alen--;
 1612         blen--;
 1613 
 1614         while (a - a0 < alen && b - b0 < blen) {
 1615                 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
 1616                         return 0;
 1617 
 1618                 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
 1619                         return 0;
 1620                 /* we don't support compression yet */
 1621                 if (a[0] >= 64 || b[0] >= 64)
 1622                         return 0;
 1623 
 1624                 /* truncated case */
 1625                 if (a[0] == 0 && a - a0 == alen - 1)
 1626                         return 1;
 1627                 if (b[0] == 0 && b - b0 == blen - 1)
 1628                         return 1;
 1629                 if (a[0] == 0 || b[0] == 0)
 1630                         return 0;
 1631 
 1632                 if (a[0] != b[0])
 1633                         return 0;
 1634                 l = a[0];
 1635                 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
 1636                         return 0;
 1637                 if (bcmp(a + 1, b + 1, l) != 0)
 1638                         return 0;
 1639 
 1640                 a += 1 + l;
 1641                 b += 1 + l;
 1642         }
 1643 
 1644         if (a - a0 == alen && b - b0 == blen)
 1645                 return 1;
 1646         else
 1647                 return 0;
 1648 }
 1649 
 1650 /*
 1651  * calculate the number of addresses to be returned in the node info reply.
 1652  */
 1653 static int
 1654 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
 1655     struct in6_addr *subj)
 1656 {
 1657         struct ifnet *ifp;
 1658         struct in6_ifaddr *ifa6;
 1659         struct ifaddr *ifa;
 1660         int addrs = 0, addrsofif, iffound = 0;
 1661         int niflags = ni6->ni_flags;
 1662 
 1663         if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
 1664                 switch (ni6->ni_code) {
 1665                 case ICMP6_NI_SUBJ_IPV6:
 1666                         if (subj == NULL) /* must be impossible... */
 1667                                 return (0);
 1668                         break;
 1669                 default:
 1670                         /*
 1671                          * XXX: we only support IPv6 subject address for
 1672                          * this Qtype.
 1673                          */
 1674                         return (0);
 1675                 }
 1676         }
 1677 
 1678         IFNET_RLOCK_NOSLEEP();
 1679         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
 1680                 addrsofif = 0;
 1681                 IF_ADDR_RLOCK(ifp);
 1682                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1683                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1684                                 continue;
 1685                         ifa6 = (struct in6_ifaddr *)ifa;
 1686 
 1687                         if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
 1688                             IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
 1689                                 iffound = 1;
 1690 
 1691                         /*
 1692                          * IPv4-mapped addresses can only be returned by a
 1693                          * Node Information proxy, since they represent
 1694                          * addresses of IPv4-only nodes, which perforce do
 1695                          * not implement this protocol.
 1696                          * [icmp-name-lookups-07, Section 5.4]
 1697                          * So we don't support NI_NODEADDR_FLAG_COMPAT in
 1698                          * this function at this moment.
 1699                          */
 1700 
 1701                         /* What do we have to do about ::1? */
 1702                         switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
 1703                         case IPV6_ADDR_SCOPE_LINKLOCAL:
 1704                                 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
 1705                                         continue;
 1706                                 break;
 1707                         case IPV6_ADDR_SCOPE_SITELOCAL:
 1708                                 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
 1709                                         continue;
 1710                                 break;
 1711                         case IPV6_ADDR_SCOPE_GLOBAL:
 1712                                 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
 1713                                         continue;
 1714                                 break;
 1715                         default:
 1716                                 continue;
 1717                         }
 1718 
 1719                         /*
 1720                          * check if anycast is okay.
 1721                          * XXX: just experimental.  not in the spec.
 1722                          */
 1723                         if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
 1724                             (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
 1725                                 continue; /* we need only unicast addresses */
 1726                         if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
 1727                             (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
 1728                                 continue;
 1729                         }
 1730                         addrsofif++; /* count the address */
 1731                 }
 1732                 IF_ADDR_RUNLOCK(ifp);
 1733                 if (iffound) {
 1734                         *ifpp = ifp;
 1735                         IFNET_RUNLOCK_NOSLEEP();
 1736                         return (addrsofif);
 1737                 }
 1738 
 1739                 addrs += addrsofif;
 1740         }
 1741         IFNET_RUNLOCK_NOSLEEP();
 1742 
 1743         return (addrs);
 1744 }
 1745 
 1746 static int
 1747 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
 1748     struct ifnet *ifp0, int resid)
 1749 {
 1750         struct ifnet *ifp;
 1751         struct in6_ifaddr *ifa6;
 1752         struct ifaddr *ifa;
 1753         struct ifnet *ifp_dep = NULL;
 1754         int copied = 0, allow_deprecated = 0;
 1755         u_char *cp = (u_char *)(nni6 + 1);
 1756         int niflags = ni6->ni_flags;
 1757         u_int32_t ltime;
 1758 
 1759         if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
 1760                 return (0);     /* needless to copy */
 1761 
 1762         IFNET_RLOCK_NOSLEEP();
 1763         ifp = ifp0 ? ifp0 : TAILQ_FIRST(&V_ifnet);
 1764   again:
 1765 
 1766         for (; ifp; ifp = TAILQ_NEXT(ifp, if_link)) {
 1767                 IF_ADDR_RLOCK(ifp);
 1768                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1769                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1770                                 continue;
 1771                         ifa6 = (struct in6_ifaddr *)ifa;
 1772 
 1773                         if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
 1774                             allow_deprecated == 0) {
 1775                                 /*
 1776                                  * prefererred address should be put before
 1777                                  * deprecated addresses.
 1778                                  */
 1779 
 1780                                 /* record the interface for later search */
 1781                                 if (ifp_dep == NULL)
 1782                                         ifp_dep = ifp;
 1783 
 1784                                 continue;
 1785                         } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
 1786                             allow_deprecated != 0)
 1787                                 continue; /* we now collect deprecated addrs */
 1788 
 1789                         /* What do we have to do about ::1? */
 1790                         switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
 1791                         case IPV6_ADDR_SCOPE_LINKLOCAL:
 1792                                 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
 1793                                         continue;
 1794                                 break;
 1795                         case IPV6_ADDR_SCOPE_SITELOCAL:
 1796                                 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
 1797                                         continue;
 1798                                 break;
 1799                         case IPV6_ADDR_SCOPE_GLOBAL:
 1800                                 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
 1801                                         continue;
 1802                                 break;
 1803                         default:
 1804                                 continue;
 1805                         }
 1806 
 1807                         /*
 1808                          * check if anycast is okay.
 1809                          * XXX: just experimental.  not in the spec.
 1810                          */
 1811                         if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
 1812                             (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
 1813                                 continue;
 1814                         if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
 1815                             (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
 1816                                 continue;
 1817                         }
 1818 
 1819                         /* now we can copy the address */
 1820                         if (resid < sizeof(struct in6_addr) +
 1821                             sizeof(u_int32_t)) {
 1822                                 IF_ADDR_RUNLOCK(ifp);
 1823                                 /*
 1824                                  * We give up much more copy.
 1825                                  * Set the truncate flag and return.
 1826                                  */
 1827                                 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
 1828                                 IFNET_RUNLOCK_NOSLEEP();
 1829                                 return (copied);
 1830                         }
 1831 
 1832                         /*
 1833                          * Set the TTL of the address.
 1834                          * The TTL value should be one of the following
 1835                          * according to the specification:
 1836                          *
 1837                          * 1. The remaining lifetime of a DHCP lease on the
 1838                          *    address, or
 1839                          * 2. The remaining Valid Lifetime of a prefix from
 1840                          *    which the address was derived through Stateless
 1841                          *    Autoconfiguration.
 1842                          *
 1843                          * Note that we currently do not support stateful
 1844                          * address configuration by DHCPv6, so the former
 1845                          * case can't happen.
 1846                          */
 1847                         if (ifa6->ia6_lifetime.ia6t_expire == 0)
 1848                                 ltime = ND6_INFINITE_LIFETIME;
 1849                         else {
 1850                                 if (ifa6->ia6_lifetime.ia6t_expire >
 1851                                     time_uptime)
 1852                                         ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
 1853                                 else
 1854                                         ltime = 0;
 1855                         }
 1856 
 1857                         bcopy(&ltime, cp, sizeof(u_int32_t));
 1858                         cp += sizeof(u_int32_t);
 1859 
 1860                         /* copy the address itself */
 1861                         bcopy(&ifa6->ia_addr.sin6_addr, cp,
 1862                             sizeof(struct in6_addr));
 1863                         in6_clearscope((struct in6_addr *)cp); /* XXX */
 1864                         cp += sizeof(struct in6_addr);
 1865 
 1866                         resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
 1867                         copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
 1868                 }
 1869                 IF_ADDR_RUNLOCK(ifp);
 1870                 if (ifp0)       /* we need search only on the specified IF */
 1871                         break;
 1872         }
 1873 
 1874         if (allow_deprecated == 0 && ifp_dep != NULL) {
 1875                 ifp = ifp_dep;
 1876                 allow_deprecated = 1;
 1877 
 1878                 goto again;
 1879         }
 1880 
 1881         IFNET_RUNLOCK_NOSLEEP();
 1882 
 1883         return (copied);
 1884 }
 1885 
 1886 /*
 1887  * XXX almost dup'ed code with rip6_input.
 1888  */
 1889 static int
 1890 icmp6_rip6_input(struct mbuf **mp, int off)
 1891 {
 1892         struct mbuf *m = *mp;
 1893         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1894         struct inpcb *in6p;
 1895         struct inpcb *last = NULL;
 1896         struct sockaddr_in6 fromsa;
 1897         struct icmp6_hdr *icmp6;
 1898         struct mbuf *opts = NULL;
 1899 
 1900 #ifndef PULLDOWN_TEST
 1901         /* this is assumed to be safe. */
 1902         icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
 1903 #else
 1904         IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
 1905         if (icmp6 == NULL) {
 1906                 /* m is already reclaimed */
 1907                 return (IPPROTO_DONE);
 1908         }
 1909 #endif
 1910 
 1911         /*
 1912          * XXX: the address may have embedded scope zone ID, which should be
 1913          * hidden from applications.
 1914          */
 1915         bzero(&fromsa, sizeof(fromsa));
 1916         fromsa.sin6_family = AF_INET6;
 1917         fromsa.sin6_len = sizeof(struct sockaddr_in6);
 1918         fromsa.sin6_addr = ip6->ip6_src;
 1919         if (sa6_recoverscope(&fromsa)) {
 1920                 m_freem(m);
 1921                 return (IPPROTO_DONE);
 1922         }
 1923 
 1924         INP_INFO_RLOCK(&V_ripcbinfo);
 1925         LIST_FOREACH(in6p, &V_ripcb, inp_list) {
 1926                 if ((in6p->inp_vflag & INP_IPV6) == 0)
 1927                         continue;
 1928                 if (in6p->inp_ip_p != IPPROTO_ICMPV6)
 1929                         continue;
 1930                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
 1931                    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
 1932                         continue;
 1933                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
 1934                    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
 1935                         continue;
 1936                 INP_RLOCK(in6p);
 1937                 if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
 1938                     in6p->in6p_icmp6filt)) {
 1939                         INP_RUNLOCK(in6p);
 1940                         continue;
 1941                 }
 1942                 if (last != NULL) {
 1943                         struct  mbuf *n = NULL;
 1944 
 1945                         /*
 1946                          * Recent network drivers tend to allocate a single
 1947                          * mbuf cluster, rather than to make a couple of
 1948                          * mbufs without clusters.  Also, since the IPv6 code
 1949                          * path tries to avoid m_pullup(), it is highly
 1950                          * probable that we still have an mbuf cluster here
 1951                          * even though the necessary length can be stored in an
 1952                          * mbuf's internal buffer.
 1953                          * Meanwhile, the default size of the receive socket
 1954                          * buffer for raw sockets is not so large.  This means
 1955                          * the possibility of packet loss is relatively higher
 1956                          * than before.  To avoid this scenario, we copy the
 1957                          * received data to a separate mbuf that does not use
 1958                          * a cluster, if possible.
 1959                          * XXX: it is better to copy the data after stripping
 1960                          * intermediate headers.
 1961                          */
 1962                         if ((m->m_flags & M_EXT) && m->m_next == NULL &&
 1963                             m->m_len <= MHLEN) {
 1964                                 n = m_get(M_NOWAIT, m->m_type);
 1965                                 if (n != NULL) {
 1966                                         if (m_dup_pkthdr(n, m, M_NOWAIT)) {
 1967                                                 bcopy(m->m_data, n->m_data,
 1968                                                       m->m_len);
 1969                                                 n->m_len = m->m_len;
 1970                                         } else {
 1971                                                 m_free(n);
 1972                                                 n = NULL;
 1973                                         }
 1974                                 }
 1975                         }
 1976                         if (n != NULL ||
 1977                             (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
 1978                                 if (last->inp_flags & INP_CONTROLOPTS)
 1979                                         ip6_savecontrol(last, n, &opts);
 1980                                 /* strip intermediate headers */
 1981                                 m_adj(n, off);
 1982                                 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
 1983                                 if (sbappendaddr_locked(
 1984                                     &last->inp_socket->so_rcv,
 1985                                     (struct sockaddr *)&fromsa, n, opts)
 1986                                     == 0) {
 1987                                         /* should notify about lost packet */
 1988                                         m_freem(n);
 1989                                         if (opts) {
 1990                                                 m_freem(opts);
 1991                                         }
 1992                                         SOCKBUF_UNLOCK(
 1993                                             &last->inp_socket->so_rcv);
 1994                                 } else
 1995                                         sorwakeup_locked(last->inp_socket);
 1996                                 opts = NULL;
 1997                         }
 1998                         INP_RUNLOCK(last);
 1999                 }
 2000                 last = in6p;
 2001         }
 2002         INP_INFO_RUNLOCK(&V_ripcbinfo);
 2003         if (last != NULL) {
 2004                 if (last->inp_flags & INP_CONTROLOPTS)
 2005                         ip6_savecontrol(last, m, &opts);
 2006                 /* strip intermediate headers */
 2007                 m_adj(m, off);
 2008 
 2009                 /* avoid using mbuf clusters if possible (see above) */
 2010                 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
 2011                     m->m_len <= MHLEN) {
 2012                         struct mbuf *n;
 2013 
 2014                         n = m_get(M_NOWAIT, m->m_type);
 2015                         if (n != NULL) {
 2016                                 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
 2017                                         bcopy(m->m_data, n->m_data, m->m_len);
 2018                                         n->m_len = m->m_len;
 2019 
 2020                                         m_freem(m);
 2021                                         m = n;
 2022                                 } else {
 2023                                         m_freem(n);
 2024                                         n = NULL;
 2025                                 }
 2026                         }
 2027                 }
 2028                 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
 2029                 if (sbappendaddr_locked(&last->inp_socket->so_rcv,
 2030                     (struct sockaddr *)&fromsa, m, opts) == 0) {
 2031                         m_freem(m);
 2032                         if (opts)
 2033                                 m_freem(opts);
 2034                         SOCKBUF_UNLOCK(&last->inp_socket->so_rcv);
 2035                 } else
 2036                         sorwakeup_locked(last->inp_socket);
 2037                 INP_RUNLOCK(last);
 2038         } else {
 2039                 m_freem(m);
 2040                 IP6STAT_DEC(ip6s_delivered);
 2041         }
 2042         return IPPROTO_DONE;
 2043 }
 2044 
 2045 /*
 2046  * Reflect the ip6 packet back to the source.
 2047  * OFF points to the icmp6 header, counted from the top of the mbuf.
 2048  */
 2049 void
 2050 icmp6_reflect(struct mbuf *m, size_t off)
 2051 {
 2052         struct in6_addr src6, *srcp;
 2053         struct ip6_hdr *ip6;
 2054         struct icmp6_hdr *icmp6;
 2055         struct in6_ifaddr *ia = NULL;
 2056         struct ifnet *outif = NULL;
 2057         int plen;
 2058         int type, code, hlim;
 2059 
 2060         /* too short to reflect */
 2061         if (off < sizeof(struct ip6_hdr)) {
 2062                 nd6log((LOG_DEBUG,
 2063                     "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
 2064                     (u_long)off, (u_long)sizeof(struct ip6_hdr),
 2065                     __FILE__, __LINE__));
 2066                 goto bad;
 2067         }
 2068 
 2069         /*
 2070          * If there are extra headers between IPv6 and ICMPv6, strip
 2071          * off that header first.
 2072          */
 2073 #ifdef DIAGNOSTIC
 2074         if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
 2075                 panic("assumption failed in icmp6_reflect");
 2076 #endif
 2077         if (off > sizeof(struct ip6_hdr)) {
 2078                 size_t l;
 2079                 struct ip6_hdr nip6;
 2080 
 2081                 l = off - sizeof(struct ip6_hdr);
 2082                 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
 2083                 m_adj(m, l);
 2084                 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
 2085                 if (m->m_len < l) {
 2086                         if ((m = m_pullup(m, l)) == NULL)
 2087                                 return;
 2088                 }
 2089                 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
 2090         } else /* off == sizeof(struct ip6_hdr) */ {
 2091                 size_t l;
 2092                 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
 2093                 if (m->m_len < l) {
 2094                         if ((m = m_pullup(m, l)) == NULL)
 2095                                 return;
 2096                 }
 2097         }
 2098         plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
 2099         ip6 = mtod(m, struct ip6_hdr *);
 2100         ip6->ip6_nxt = IPPROTO_ICMPV6;
 2101         icmp6 = (struct icmp6_hdr *)(ip6 + 1);
 2102         type = icmp6->icmp6_type; /* keep type for statistics */
 2103         code = icmp6->icmp6_code; /* ditto. */
 2104         hlim = 0;
 2105         srcp = NULL;
 2106 
 2107         /*
 2108          * If the incoming packet was addressed directly to us (i.e. unicast),
 2109          * use dst as the src for the reply.
 2110          * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
 2111          * (for example) when we encounter an error while forwarding procedure
 2112          * destined to a duplicated address of ours.
 2113          */
 2114         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 2115                 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
 2116                 if (ia != NULL && !(ia->ia6_flags &
 2117                     (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
 2118                         src6 = ia->ia_addr.sin6_addr;
 2119                         srcp = &src6;
 2120 
 2121                         if (m->m_pkthdr.rcvif != NULL) {
 2122                                 /* XXX: This may not be the outgoing interface */
 2123                                 hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
 2124                         } else
 2125                                 hlim = V_ip6_defhlim;
 2126                 }
 2127                 if (ia != NULL)
 2128                         ifa_free(&ia->ia_ifa);
 2129         }
 2130 
 2131         if (srcp == NULL) {
 2132                 int error;
 2133                 struct in6_addr dst6;
 2134                 uint32_t scopeid;
 2135 
 2136                 /*
 2137                  * This case matches to multicasts, our anycast, or unicasts
 2138                  * that we do not own.  Select a source address based on the
 2139                  * source address of the erroneous packet.
 2140                  */
 2141                 in6_splitscope(&ip6->ip6_src, &dst6, &scopeid);
 2142                 error = in6_selectsrc_addr(M_GETFIB(m), &dst6,
 2143                     scopeid, NULL, &src6, &hlim);
 2144 
 2145                 if (error) {
 2146                         char ip6buf[INET6_ADDRSTRLEN];
 2147                         nd6log((LOG_DEBUG,
 2148                             "icmp6_reflect: source can't be determined: "
 2149                             "dst=%s, error=%d\n",
 2150                             ip6_sprintf(ip6buf, &ip6->ip6_dst), error));
 2151                         goto bad;
 2152                 }
 2153                 srcp = &src6;
 2154         }
 2155         /*
 2156          * ip6_input() drops a packet if its src is multicast.
 2157          * So, the src is never multicast.
 2158          */
 2159         ip6->ip6_dst = ip6->ip6_src;
 2160         ip6->ip6_src = *srcp;
 2161         ip6->ip6_flow = 0;
 2162         ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
 2163         ip6->ip6_vfc |= IPV6_VERSION;
 2164         ip6->ip6_nxt = IPPROTO_ICMPV6;
 2165         ip6->ip6_hlim = hlim;
 2166 
 2167         icmp6->icmp6_cksum = 0;
 2168         icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
 2169             sizeof(struct ip6_hdr), plen);
 2170 
 2171         /*
 2172          * XXX option handling
 2173          */
 2174 
 2175         m->m_flags &= ~(M_BCAST|M_MCAST);
 2176         m->m_pkthdr.rcvif = NULL;
 2177         ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
 2178         if (outif)
 2179                 icmp6_ifoutstat_inc(outif, type, code);
 2180 
 2181         return;
 2182 
 2183  bad:
 2184         m_freem(m);
 2185         return;
 2186 }
 2187 
 2188 void
 2189 icmp6_fasttimo(void)
 2190 {
 2191 
 2192         mld_fasttimo();
 2193 }
 2194 
 2195 void
 2196 icmp6_slowtimo(void)
 2197 {
 2198 
 2199         mld_slowtimo();
 2200 }
 2201 
 2202 static const char *
 2203 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
 2204     struct in6_addr *tgt6)
 2205 {
 2206         static char buf[1024];
 2207         char ip6bufs[INET6_ADDRSTRLEN];
 2208         char ip6bufd[INET6_ADDRSTRLEN];
 2209         char ip6buft[INET6_ADDRSTRLEN];
 2210         snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
 2211             ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
 2212             ip6_sprintf(ip6buft, tgt6));
 2213         return buf;
 2214 }
 2215 
 2216 void
 2217 icmp6_redirect_input(struct mbuf *m, int off)
 2218 {
 2219         struct ifnet *ifp;
 2220         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 2221         struct nd_redirect *nd_rd;
 2222         int icmp6len = ntohs(ip6->ip6_plen);
 2223         char *lladdr = NULL;
 2224         int lladdrlen = 0;
 2225         int is_router;
 2226         int is_onlink;
 2227         struct in6_addr src6 = ip6->ip6_src;
 2228         struct in6_addr redtgt6;
 2229         struct in6_addr reddst6;
 2230         union nd_opts ndopts;
 2231         char ip6buf[INET6_ADDRSTRLEN];
 2232 
 2233         M_ASSERTPKTHDR(m);
 2234         KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__));
 2235 
 2236         ifp = m->m_pkthdr.rcvif;
 2237 
 2238         /* XXX if we are router, we don't update route by icmp6 redirect */
 2239         if (V_ip6_forwarding)
 2240                 goto freeit;
 2241         if (!V_icmp6_rediraccept)
 2242                 goto freeit;
 2243 
 2244         /* RFC 6980: Nodes MUST silently ignore fragments */
 2245         if(m->m_flags & M_FRAGMENTED)
 2246                 goto freeit;
 2247 
 2248 #ifndef PULLDOWN_TEST
 2249         IP6_EXTHDR_CHECK(m, off, icmp6len,);
 2250         nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
 2251 #else
 2252         IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
 2253         if (nd_rd == NULL) {
 2254                 ICMP6STAT_INC(icp6s_tooshort);
 2255                 return;
 2256         }
 2257 #endif
 2258         redtgt6 = nd_rd->nd_rd_target;
 2259         reddst6 = nd_rd->nd_rd_dst;
 2260 
 2261         if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
 2262             in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
 2263                 goto freeit;
 2264         }
 2265 
 2266         /* validation */
 2267         if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
 2268                 nd6log((LOG_ERR,
 2269                     "ICMP6 redirect sent from %s rejected; "
 2270                     "must be from linklocal\n",
 2271                     ip6_sprintf(ip6buf, &src6)));
 2272                 goto bad;
 2273         }
 2274         if (ip6->ip6_hlim != 255) {
 2275                 nd6log((LOG_ERR,
 2276                     "ICMP6 redirect sent from %s rejected; "
 2277                     "hlim=%d (must be 255)\n",
 2278                     ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
 2279                 goto bad;
 2280         }
 2281     {
 2282         /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
 2283         struct nhop6_basic nh6;
 2284         struct in6_addr kdst;
 2285         uint32_t scopeid;
 2286 
 2287         in6_splitscope(&reddst6, &kdst, &scopeid);
 2288         if (fib6_lookup_nh_basic(ifp->if_fib, &kdst, scopeid, 0, 0,&nh6)==0){
 2289                 if ((nh6.nh_flags & NHF_GATEWAY) == 0) {
 2290                         nd6log((LOG_ERR,
 2291                             "ICMP6 redirect rejected; no route "
 2292                             "with inet6 gateway found for redirect dst: %s\n",
 2293                             icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2294                         goto bad;
 2295                 }
 2296 
 2297                 /*
 2298                  * Embed scope zone id into next hop address, since
 2299                  * fib6_lookup_nh_basic() returns address without embedded
 2300                  * scope zone id.
 2301                  */
 2302                 if (in6_setscope(&nh6.nh_addr, m->m_pkthdr.rcvif, NULL))
 2303                         goto freeit;
 2304 
 2305                 if (IN6_ARE_ADDR_EQUAL(&src6, &nh6.nh_addr) == 0) {
 2306                         nd6log((LOG_ERR,
 2307                             "ICMP6 redirect rejected; "
 2308                             "not equal to gw-for-src=%s (must be same): "
 2309                             "%s\n",
 2310                             ip6_sprintf(ip6buf, &nh6.nh_addr),
 2311                             icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2312                         goto bad;
 2313                 }
 2314         } else {
 2315                 nd6log((LOG_ERR,
 2316                     "ICMP6 redirect rejected; "
 2317                     "no route found for redirect dst: %s\n",
 2318                     icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2319                 goto bad;
 2320         }
 2321     }
 2322         if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
 2323                 nd6log((LOG_ERR,
 2324                     "ICMP6 redirect rejected; "
 2325                     "redirect dst must be unicast: %s\n",
 2326                     icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2327                 goto bad;
 2328         }
 2329 
 2330         is_router = is_onlink = 0;
 2331         if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
 2332                 is_router = 1;  /* router case */
 2333         if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
 2334                 is_onlink = 1;  /* on-link destination case */
 2335         if (!is_router && !is_onlink) {
 2336                 nd6log((LOG_ERR,
 2337                     "ICMP6 redirect rejected; "
 2338                     "neither router case nor onlink case: %s\n",
 2339                     icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2340                 goto bad;
 2341         }
 2342 
 2343         icmp6len -= sizeof(*nd_rd);
 2344         nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
 2345         if (nd6_options(&ndopts) < 0) {
 2346                 nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n",
 2347                     __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2348                 /* nd6_options have incremented stats */
 2349                 goto freeit;
 2350         }
 2351 
 2352         if (ndopts.nd_opts_tgt_lladdr) {
 2353                 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
 2354                 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
 2355         }
 2356 
 2357         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
 2358                 nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s "
 2359                     "(if %d, icmp6 packet %d): %s\n",
 2360                     __func__, ip6_sprintf(ip6buf, &redtgt6),
 2361                     ifp->if_addrlen, lladdrlen - 2,
 2362                     icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
 2363                 goto bad;
 2364         }
 2365 
 2366         /* Validation passed. */
 2367 
 2368         /* RFC 2461 8.3 */
 2369         nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
 2370             is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
 2371 
 2372         /*
 2373          * Install a gateway route in the better-router case or an interface
 2374          * route in the on-link-destination case.
 2375          */
 2376         {
 2377                 struct sockaddr_in6 sdst;
 2378                 struct sockaddr_in6 sgw;
 2379                 struct sockaddr_in6 ssrc;
 2380                 struct sockaddr *gw;
 2381                 int rt_flags;
 2382                 u_int fibnum;
 2383 
 2384                 bzero(&sdst, sizeof(sdst));
 2385                 bzero(&ssrc, sizeof(ssrc));
 2386                 sdst.sin6_family = ssrc.sin6_family = AF_INET6;
 2387                 sdst.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6);
 2388                 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
 2389                 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
 2390                 rt_flags = RTF_HOST;
 2391                 if (is_router) {
 2392                         bzero(&sgw, sizeof(sgw));
 2393                         sgw.sin6_family = AF_INET6;
 2394                         sgw.sin6_len = sizeof(struct sockaddr_in6);
 2395                         bcopy(&redtgt6, &sgw.sin6_addr,
 2396                                 sizeof(struct in6_addr));
 2397                         gw = (struct sockaddr *)&sgw;
 2398                         rt_flags |= RTF_GATEWAY;
 2399                 } else
 2400                         gw = ifp->if_addr->ifa_addr;
 2401                 for (fibnum = 0; fibnum < rt_numfibs; fibnum++)
 2402                         in6_rtredirect((struct sockaddr *)&sdst, gw,
 2403                             (struct sockaddr *)NULL, rt_flags,
 2404                             (struct sockaddr *)&ssrc, fibnum);
 2405         }
 2406         /* finally update cached route in each socket via pfctlinput */
 2407     {
 2408         struct sockaddr_in6 sdst;
 2409 
 2410         bzero(&sdst, sizeof(sdst));
 2411         sdst.sin6_family = AF_INET6;
 2412         sdst.sin6_len = sizeof(struct sockaddr_in6);
 2413         bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
 2414         pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
 2415     }
 2416 
 2417  freeit:
 2418         m_freem(m);
 2419         return;
 2420 
 2421  bad:
 2422         ICMP6STAT_INC(icp6s_badredirect);
 2423         m_freem(m);
 2424 }
 2425 
 2426 void
 2427 icmp6_redirect_output(struct mbuf *m0, 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 m_tag *mtag;
 2435         struct ip6_hdr *ip6;    /* m as struct ip6_hdr */
 2436         struct nd_redirect *nd_rd;
 2437         struct llentry *ln = NULL;
 2438         size_t maxlen;
 2439         u_char *p;
 2440         struct ifnet *outif = NULL;
 2441         struct sockaddr_in6 src_sa;
 2442 
 2443         icmp6_errcount(ND_REDIRECT, 0);
 2444 
 2445         /* if we are not router, we don't send icmp6 redirect */
 2446         if (!V_ip6_forwarding)
 2447                 goto fail;
 2448 
 2449         /* sanity check */
 2450         if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
 2451                 goto fail;
 2452 
 2453         /*
 2454          * Address check:
 2455          *  the source address must identify a neighbor, and
 2456          *  the destination address must not be a multicast address
 2457          *  [RFC 2461, sec 8.2]
 2458          */
 2459         sip6 = mtod(m0, struct ip6_hdr *);
 2460         bzero(&src_sa, sizeof(src_sa));
 2461         src_sa.sin6_family = AF_INET6;
 2462         src_sa.sin6_len = sizeof(src_sa);
 2463         src_sa.sin6_addr = 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         m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 2482         if (m == NULL)
 2483                 goto fail;
 2484         M_SETFIB(m, rt->rt_fibnum);
 2485         maxlen = M_TRAILINGSPACE(m);
 2486         maxlen = min(IPV6_MMTU, maxlen);
 2487         /* just for safety */
 2488         if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
 2489             ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
 2490                 goto fail;
 2491         }
 2492 
 2493         {
 2494                 /* get ip6 linklocal address for ifp(my outgoing interface). */
 2495                 struct in6_ifaddr *ia;
 2496                 if ((ia = in6ifa_ifpforlinklocal(ifp,
 2497                                                  IN6_IFF_NOTREADY|
 2498                                                  IN6_IFF_ANYCAST)) == NULL)
 2499                         goto fail;
 2500                 ifp_ll6 = &ia->ia_addr.sin6_addr;
 2501                 /* XXXRW: reference released prematurely. */
 2502                 ifa_free(&ia->ia_ifa);
 2503         }
 2504 
 2505         /* get ip6 linklocal address for the router. */
 2506         if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
 2507                 struct sockaddr_in6 *sin6;
 2508                 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
 2509                 router_ll6 = &sin6->sin6_addr;
 2510                 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
 2511                         router_ll6 = (struct in6_addr *)NULL;
 2512         } else
 2513                 router_ll6 = (struct in6_addr *)NULL;
 2514 
 2515         /* ip6 */
 2516         ip6 = mtod(m, struct ip6_hdr *);
 2517         ip6->ip6_flow = 0;
 2518         ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
 2519         ip6->ip6_vfc |= IPV6_VERSION;
 2520         /* ip6->ip6_plen will be set later */
 2521         ip6->ip6_nxt = IPPROTO_ICMPV6;
 2522         ip6->ip6_hlim = 255;
 2523         /* ip6->ip6_src must be linklocal addr for my outgoing if. */
 2524         bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
 2525         bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
 2526 
 2527         /* ND Redirect */
 2528         nd_rd = (struct nd_redirect *)(ip6 + 1);
 2529         nd_rd->nd_rd_type = ND_REDIRECT;
 2530         nd_rd->nd_rd_code = 0;
 2531         nd_rd->nd_rd_reserved = 0;
 2532         if (rt->rt_flags & RTF_GATEWAY) {
 2533                 /*
 2534                  * nd_rd->nd_rd_target must be a link-local address in
 2535                  * better router cases.
 2536                  */
 2537                 if (!router_ll6)
 2538                         goto fail;
 2539                 bcopy(router_ll6, &nd_rd->nd_rd_target,
 2540                     sizeof(nd_rd->nd_rd_target));
 2541                 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
 2542                     sizeof(nd_rd->nd_rd_dst));
 2543         } else {
 2544                 /* make sure redtgt == reddst */
 2545                 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
 2546                     sizeof(nd_rd->nd_rd_target));
 2547                 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
 2548                     sizeof(nd_rd->nd_rd_dst));
 2549         }
 2550 
 2551         p = (u_char *)(nd_rd + 1);
 2552 
 2553         if (!router_ll6)
 2554                 goto nolladdropt;
 2555 
 2556         {
 2557                 /* target lladdr option */
 2558                 int len;
 2559                 struct nd_opt_hdr *nd_opt;
 2560                 char *lladdr;
 2561 
 2562                 IF_AFDATA_RLOCK(ifp);
 2563                 ln = nd6_lookup(router_ll6, 0, ifp);
 2564                 IF_AFDATA_RUNLOCK(ifp);
 2565                 if (ln == NULL)
 2566                         goto nolladdropt;
 2567 
 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 
 2574                 if (ln->la_flags & LLE_VALID) {
 2575                         nd_opt = (struct nd_opt_hdr *)p;
 2576                         nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
 2577                         nd_opt->nd_opt_len = len >> 3;
 2578                         lladdr = (char *)(nd_opt + 1);
 2579                         bcopy(ln->ll_addr, lladdr, ifp->if_addrlen);
 2580                         p += len;
 2581                 }
 2582         }
 2583 nolladdropt:
 2584         if (ln != NULL)
 2585                 LLE_RUNLOCK(ln);
 2586                 
 2587         m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
 2588 
 2589         /* just to be safe */
 2590 #ifdef M_DECRYPTED      /*not openbsd*/
 2591         if (m0->m_flags & M_DECRYPTED)
 2592                 goto noredhdropt;
 2593 #endif
 2594         if (p - (u_char *)ip6 > maxlen)
 2595                 goto noredhdropt;
 2596 
 2597         {
 2598                 /* redirected header option */
 2599                 int len;
 2600                 struct nd_opt_rd_hdr *nd_opt_rh;
 2601 
 2602                 /*
 2603                  * compute the maximum size for icmp6 redirect header option.
 2604                  * XXX room for auth header?
 2605                  */
 2606                 len = maxlen - (p - (u_char *)ip6);
 2607                 len &= ~7;
 2608 
 2609                 /* This is just for simplicity. */
 2610                 if (m0->m_pkthdr.len != m0->m_len) {
 2611                         if (m0->m_next) {
 2612                                 m_freem(m0->m_next);
 2613                                 m0->m_next = NULL;
 2614                         }
 2615                         m0->m_pkthdr.len = m0->m_len;
 2616                 }
 2617 
 2618                 /*
 2619                  * Redirected header option spec (RFC2461 4.6.3) talks nothing
 2620                  * about padding/truncate rule for the original IP packet.
 2621                  * From the discussion on IPv6imp in Feb 1999,
 2622                  * the consensus was:
 2623                  * - "attach as much as possible" is the goal
 2624                  * - pad if not aligned (original size can be guessed by
 2625                  *   original 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__,
 2631                             __LINE__);
 2632 
 2633                 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
 2634                         /* not enough room, truncate */
 2635                         m0->m_pkthdr.len = m0->m_len = len -
 2636                             sizeof(*nd_opt_rh);
 2637                 } else {
 2638                         /* enough room, pad or truncate */
 2639                         size_t extra;
 2640 
 2641                         extra = m0->m_pkthdr.len % 8;
 2642                         if (extra) {
 2643                                 /* pad if easy enough, truncate if not */
 2644                                 if (8 - extra <= M_TRAILINGSPACE(m0)) {
 2645                                         /* pad */
 2646                                         m0->m_len += (8 - extra);
 2647                                         m0->m_pkthdr.len += (8 - extra);
 2648                                 } else {
 2649                                         /* truncate */
 2650                                         m0->m_pkthdr.len -= extra;
 2651                                         m0->m_len -= extra;
 2652                                 }
 2653                         }
 2654                         len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
 2655                         m0->m_pkthdr.len = m0->m_len = len -
 2656                             sizeof(*nd_opt_rh);
 2657                 }
 2658 
 2659                 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
 2660                 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
 2661                 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
 2662                 nd_opt_rh->nd_opt_rh_len = len >> 3;
 2663                 p += sizeof(*nd_opt_rh);
 2664                 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
 2665 
 2666                 /* connect m0 to m */
 2667                 m_tag_delete_chain(m0, NULL);
 2668                 m0->m_flags &= ~M_PKTHDR;
 2669                 m->m_next = m0;
 2670                 m->m_pkthdr.len = m->m_len + m0->m_len;
 2671                 m0 = NULL;
 2672         }
 2673 noredhdropt:;
 2674         if (m0) {
 2675                 m_freem(m0);
 2676                 m0 = NULL;
 2677         }
 2678 
 2679         /* XXX: clear embedded link IDs in the inner header */
 2680         in6_clearscope(&sip6->ip6_src);
 2681         in6_clearscope(&sip6->ip6_dst);
 2682         in6_clearscope(&nd_rd->nd_rd_target);
 2683         in6_clearscope(&nd_rd->nd_rd_dst);
 2684 
 2685         ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
 2686 
 2687         nd_rd->nd_rd_cksum = 0;
 2688         nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
 2689             sizeof(*ip6), ntohs(ip6->ip6_plen));
 2690 
 2691         if (send_sendso_input_hook != NULL) {
 2692                 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short),
 2693                         M_NOWAIT);
 2694                 if (mtag == NULL)
 2695                         goto fail;
 2696                 *(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type;
 2697                 m_tag_prepend(m, mtag);
 2698         }
 2699 
 2700         /* send the packet to outside... */
 2701         ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
 2702         if (outif) {
 2703                 icmp6_ifstat_inc(outif, ifs6_out_msg);
 2704                 icmp6_ifstat_inc(outif, ifs6_out_redirect);
 2705         }
 2706         ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
 2707 
 2708         return;
 2709 
 2710 fail:
 2711         if (m)
 2712                 m_freem(m);
 2713         if (m0)
 2714                 m_freem(m0);
 2715 }
 2716 
 2717 /*
 2718  * ICMPv6 socket option processing.
 2719  */
 2720 int
 2721 icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
 2722 {
 2723         int error = 0;
 2724         int optlen;
 2725         struct inpcb *inp = sotoinpcb(so);
 2726         int level, op, optname;
 2727 
 2728         if (sopt) {
 2729                 level = sopt->sopt_level;
 2730                 op = sopt->sopt_dir;
 2731                 optname = sopt->sopt_name;
 2732                 optlen = sopt->sopt_valsize;
 2733         } else
 2734                 level = op = optname = optlen = 0;
 2735 
 2736         if (level != IPPROTO_ICMPV6) {
 2737                 return EINVAL;
 2738         }
 2739 
 2740         switch (op) {
 2741         case PRCO_SETOPT:
 2742                 switch (optname) {
 2743                 case ICMP6_FILTER:
 2744                     {
 2745                         struct icmp6_filter ic6f;
 2746 
 2747                         if (optlen != sizeof(ic6f)) {
 2748                                 error = EMSGSIZE;
 2749                                 break;
 2750                         }
 2751                         error = sooptcopyin(sopt, &ic6f, optlen, optlen);
 2752                         if (error == 0) {
 2753                                 INP_WLOCK(inp);
 2754                                 *inp->in6p_icmp6filt = ic6f;
 2755                                 INP_WUNLOCK(inp);
 2756                         }
 2757                         break;
 2758                     }
 2759 
 2760                 default:
 2761                         error = ENOPROTOOPT;
 2762                         break;
 2763                 }
 2764                 break;
 2765 
 2766         case PRCO_GETOPT:
 2767                 switch (optname) {
 2768                 case ICMP6_FILTER:
 2769                     {
 2770                         struct icmp6_filter ic6f;
 2771 
 2772                         INP_RLOCK(inp);
 2773                         ic6f = *inp->in6p_icmp6filt;
 2774                         INP_RUNLOCK(inp);
 2775                         error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
 2776                         break;
 2777                     }
 2778 
 2779                 default:
 2780                         error = ENOPROTOOPT;
 2781                         break;
 2782                 }
 2783                 break;
 2784         }
 2785 
 2786         return (error);
 2787 }
 2788 
 2789 /*
 2790  * Perform rate limit check.
 2791  * Returns 0 if it is okay to send the icmp6 packet.
 2792  * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
 2793  * limitation.
 2794  *
 2795  * XXX per-destination/type check necessary?
 2796  *
 2797  * dst - not used at this moment
 2798  * type - not used at this moment
 2799  * code - not used at this moment
 2800  */
 2801 static int
 2802 icmp6_ratelimit(const struct in6_addr *dst, const int type,
 2803     const int code)
 2804 {
 2805         int ret;
 2806 
 2807         ret = 0;        /* okay to send */
 2808 
 2809         /* PPS limit */
 2810         if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count,
 2811             V_icmp6errppslim)) {
 2812                 /* The packet is subject to rate limit */
 2813                 ret++;
 2814         }
 2815 
 2816         return ret;
 2817 }

Cache object: ec4491961aa771f5b2538032d37e6835


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