The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ip6_input.c

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    1 /*      $NetBSD: ip6_input.c,v 1.227 2022/10/28 05:18:39 ozaki-r Exp $  */
    2 /*      $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
    3 
    4 /*
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * Copyright (c) 1982, 1986, 1988, 1993
   35  *      The Regents of the University of California.  All rights reserved.
   36  *
   37  * Redistribution and use in source and binary forms, with or without
   38  * modification, are permitted provided that the following conditions
   39  * are met:
   40  * 1. Redistributions of source code must retain the above copyright
   41  *    notice, this list of conditions and the following disclaimer.
   42  * 2. Redistributions in binary form must reproduce the above copyright
   43  *    notice, this list of conditions and the following disclaimer in the
   44  *    documentation and/or other materials provided with the distribution.
   45  * 3. Neither the name of the University nor the names of its contributors
   46  *    may be used to endorse or promote products derived from this software
   47  *    without specific prior written permission.
   48  *
   49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   59  * SUCH DAMAGE.
   60  *
   61  *      @(#)ip_input.c  8.2 (Berkeley) 1/4/94
   62  */
   63 
   64 #include <sys/cdefs.h>
   65 __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.227 2022/10/28 05:18:39 ozaki-r Exp $");
   66 
   67 #ifdef _KERNEL_OPT
   68 #include "opt_gateway.h"
   69 #include "opt_inet.h"
   70 #include "opt_inet6.h"
   71 #include "opt_ipsec.h"
   72 #include "opt_net_mpsafe.h"
   73 #endif
   74 
   75 #include <sys/param.h>
   76 #include <sys/systm.h>
   77 #include <sys/mbuf.h>
   78 #include <sys/domain.h>
   79 #include <sys/protosw.h>
   80 #include <sys/socket.h>
   81 #include <sys/socketvar.h>
   82 #include <sys/errno.h>
   83 #include <sys/time.h>
   84 #include <sys/kernel.h>
   85 #include <sys/syslog.h>
   86 #include <sys/proc.h>
   87 #include <sys/sysctl.h>
   88 #include <sys/cprng.h>
   89 #include <sys/percpu.h>
   90 
   91 #include <net/if.h>
   92 #include <net/if_types.h>
   93 #include <net/if_dl.h>
   94 #include <net/route.h>
   95 #include <net/pktqueue.h>
   96 #include <net/pfil.h>
   97 
   98 #include <netinet/in.h>
   99 #include <netinet/in_systm.h>
  100 #ifdef INET
  101 #include <netinet/ip.h>
  102 #include <netinet/ip_var.h>
  103 #include <netinet/ip_icmp.h>
  104 #endif /* INET */
  105 #include <netinet/ip6.h>
  106 #include <netinet/portalgo.h>
  107 #include <netinet6/in6_var.h>
  108 #include <netinet6/ip6_var.h>
  109 #include <netinet6/ip6_private.h>
  110 #include <netinet6/in6_pcb.h>
  111 #include <netinet/icmp6.h>
  112 #include <netinet6/scope6_var.h>
  113 #include <netinet6/in6_ifattach.h>
  114 #include <netinet6/nd6.h>
  115 
  116 #ifdef IPSEC
  117 #include <netipsec/ipsec.h>
  118 #include <netipsec/ipsec6.h>
  119 #include <netipsec/key.h>
  120 #endif /* IPSEC */
  121 
  122 #include <netinet6/ip6protosw.h>
  123 
  124 #include "faith.h"
  125 
  126 extern struct domain inet6domain;
  127 
  128 u_char ip6_protox[IPPROTO_MAX];
  129 pktqueue_t *ip6_pktq __read_mostly;
  130 
  131 pfil_head_t *inet6_pfil_hook;
  132 
  133 percpu_t *ip6stat_percpu;
  134 
  135 percpu_t *ip6_forward_rt_percpu __cacheline_aligned;
  136 
  137 static void ip6intr(void *);
  138 static void ip6_input(struct mbuf *, struct ifnet *);
  139 static bool ip6_badaddr(struct ip6_hdr *);
  140 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
  141 
  142 static struct m_tag *ip6_addaux(struct mbuf *);
  143 static struct m_tag *ip6_findaux(struct mbuf *);
  144 static void ip6_delaux(struct mbuf *);
  145 
  146 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
  147     u_int32_t *);
  148 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
  149 static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
  150 
  151 #ifdef NET_MPSAFE
  152 #define SOFTNET_LOCK()          mutex_enter(softnet_lock)
  153 #define SOFTNET_UNLOCK()        mutex_exit(softnet_lock)
  154 #else
  155 #define SOFTNET_LOCK()          KASSERT(mutex_owned(softnet_lock))
  156 #define SOFTNET_UNLOCK()        KASSERT(mutex_owned(softnet_lock))
  157 #endif
  158 
  159 /* Ensure that non packed structures are the desired size. */
  160 __CTASSERT(sizeof(struct ip6_hdr) == 40);
  161 __CTASSERT(sizeof(struct ip6_ext) == 2);
  162 __CTASSERT(sizeof(struct ip6_hbh) == 2);
  163 __CTASSERT(sizeof(struct ip6_dest) == 2);
  164 __CTASSERT(sizeof(struct ip6_opt) == 2);
  165 __CTASSERT(sizeof(struct ip6_opt_jumbo) == 6);
  166 __CTASSERT(sizeof(struct ip6_opt_nsap) == 4);
  167 __CTASSERT(sizeof(struct ip6_opt_tunnel) == 3);
  168 __CTASSERT(sizeof(struct ip6_opt_router) == 4);
  169 __CTASSERT(sizeof(struct ip6_rthdr) == 4);
  170 __CTASSERT(sizeof(struct ip6_rthdr0) == 8);
  171 __CTASSERT(sizeof(struct ip6_frag) == 8);
  172 
  173 /*
  174  * IP6 initialization: fill in IP6 protocol switch table.
  175  * All protocols not implemented in kernel go to raw IP6 protocol handler.
  176  */
  177 void
  178 ip6_init(void)
  179 {
  180         const struct ip6protosw *pr;
  181         int i;
  182 
  183         in6_init();
  184 
  185         ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL);
  186         KASSERT(ip6_pktq != NULL);
  187 
  188         sysctl_net_inet6_ip6_setup(NULL);
  189         pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
  190         if (pr == 0)
  191                 panic("ip6_init");
  192         for (i = 0; i < IPPROTO_MAX; i++)
  193                 ip6_protox[i] = pr - inet6sw;
  194         for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
  195             pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
  196                 if (pr->pr_domain->dom_family == PF_INET6 &&
  197                     pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
  198                         ip6_protox[pr->pr_protocol] = pr - inet6sw;
  199 
  200         scope6_init();
  201         addrsel_policy_init();
  202         nd6_init();
  203         frag6_init();
  204 
  205 #ifdef GATEWAY
  206         ip6flow_init(ip6_hashsize);
  207 #endif
  208         /* Register our Packet Filter hook. */
  209         inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6);
  210         KASSERT(inet6_pfil_hook != NULL);
  211 
  212         ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
  213         ip6_forward_rt_percpu = rtcache_percpu_alloc();
  214 }
  215 
  216 /*
  217  * IP6 input interrupt handling. Just pass the packet to ip6_input.
  218  */
  219 static void
  220 ip6intr(void *arg __unused)
  221 {
  222         struct mbuf *m;
  223 
  224         SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
  225         while ((m = pktq_dequeue(ip6_pktq)) != NULL) {
  226                 struct psref psref;
  227                 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref);
  228 
  229                 if (rcvif == NULL) {
  230                         IP6_STATINC(IP6_STAT_IFDROP);
  231                         m_freem(m);
  232                         continue;
  233                 }
  234                 /*
  235                  * Drop the packet if IPv6 is disabled on the interface.
  236                  */
  237                 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) {
  238                         m_put_rcvif_psref(rcvif, &psref);
  239                         IP6_STATINC(IP6_STAT_IFDROP);
  240                         m_freem(m);
  241                         continue;
  242                 }
  243                 ip6_input(m, rcvif);
  244                 m_put_rcvif_psref(rcvif, &psref);
  245         }
  246         SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
  247 }
  248 
  249 static void
  250 ip6_input(struct mbuf *m, struct ifnet *rcvif)
  251 {
  252         struct ip6_hdr *ip6;
  253         int hit, off = sizeof(struct ip6_hdr), nest;
  254         u_int32_t plen;
  255         u_int32_t rtalert = ~0;
  256         int nxt, ours = 0, rh_present = 0, frg_present;
  257         struct ifnet *deliverifp = NULL;
  258         int srcrt = 0;
  259         struct rtentry *rt = NULL;
  260         union {
  261                 struct sockaddr         dst;
  262                 struct sockaddr_in6     dst6;
  263         } u;
  264         struct route *ro;
  265 
  266         KASSERT(rcvif != NULL);
  267 
  268         /*
  269          * make sure we don't have onion peering information into m_tag.
  270          */
  271         ip6_delaux(m);
  272 
  273         /*
  274          * mbuf statistics
  275          */
  276         if (m->m_flags & M_EXT) {
  277                 if (m->m_next)
  278                         IP6_STATINC(IP6_STAT_MEXT2M);
  279                 else
  280                         IP6_STATINC(IP6_STAT_MEXT1);
  281         } else {
  282 #define M2MMAX  32
  283                 if (m->m_next) {
  284                         if (m->m_flags & M_LOOP)
  285                         /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
  286                         else if (rcvif->if_index < M2MMAX)
  287                                 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index);
  288                         else
  289                                 IP6_STATINC(IP6_STAT_M2M);
  290                 } else
  291                         IP6_STATINC(IP6_STAT_M1);
  292 #undef M2MMAX
  293         }
  294 
  295         in6_ifstat_inc(rcvif, ifs6_in_receive);
  296         IP6_STATINC(IP6_STAT_TOTAL);
  297 
  298         /*
  299          * If the IPv6 header is not aligned, slurp it up into a new
  300          * mbuf with space for link headers, in the event we forward
  301          * it.  Otherwise, if it is aligned, make sure the entire base
  302          * IPv6 header is in the first mbuf of the chain.
  303          */
  304         if (M_GET_ALIGNED_HDR(&m, struct ip6_hdr, true) != 0) {
  305                 /* XXXJRT new stat, please */
  306                 IP6_STATINC(IP6_STAT_TOOSMALL);
  307                 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
  308                 return;
  309         }
  310 
  311         ip6 = mtod(m, struct ip6_hdr *);
  312 
  313         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
  314                 IP6_STATINC(IP6_STAT_BADVERS);
  315                 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
  316                 goto bad;
  317         }
  318 
  319         if (ip6_badaddr(ip6)) {
  320                 IP6_STATINC(IP6_STAT_BADSCOPE);
  321                 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
  322                 goto bad;
  323         }
  324 
  325         /*
  326          * Assume that we can create a fast-forward IP flow entry
  327          * based on this packet.
  328          */
  329         m->m_flags |= M_CANFASTFWD;
  330 
  331         /*
  332          * Run through list of hooks for input packets.  If there are any
  333          * filters which require that additional packets in the flow are
  334          * not fast-forwarded, they must clear the M_CANFASTFWD flag.
  335          * Note that filters must _never_ set this flag, as another filter
  336          * in the list may have previously cleared it.
  337          *
  338          * Don't call hooks if the packet has already been processed by
  339          * IPsec (encapsulated, tunnel mode).
  340          */
  341 #if defined(IPSEC)
  342         if (!ipsec_used || !ipsec_skip_pfil(m))
  343 #else
  344         if (1)
  345 #endif
  346         {
  347                 struct in6_addr odst;
  348                 int error;
  349 
  350                 odst = ip6->ip6_dst;
  351                 error = pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN);
  352                 if (error != 0 || m == NULL) {
  353                         IP6_STATINC(IP6_STAT_PFILDROP_IN);
  354                         return;
  355                 }
  356                 if (m->m_len < sizeof(struct ip6_hdr)) {
  357                         if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
  358                                 IP6_STATINC(IP6_STAT_TOOSMALL);
  359                                 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
  360                                 return;
  361                         }
  362                 }
  363                 ip6 = mtod(m, struct ip6_hdr *);
  364                 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
  365         }
  366 
  367         IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
  368 
  369 #ifdef ALTQ
  370         if (altq_input != NULL) {
  371                 SOFTNET_LOCK();
  372                 if ((*altq_input)(m, AF_INET6) == 0) {
  373                         SOFTNET_UNLOCK();
  374                         /* packet is dropped by traffic conditioner */
  375                         return;
  376                 }
  377                 SOFTNET_UNLOCK();
  378         }
  379 #endif
  380 
  381         /*
  382          * Disambiguate address scope zones (if there is ambiguity).
  383          * We first make sure that the original source or destination address
  384          * is not in our internal form for scoped addresses.  Such addresses
  385          * are not necessarily invalid spec-wise, but we cannot accept them due
  386          * to the usage conflict.
  387          * in6_setscope() then also checks and rejects the cases where src or
  388          * dst are the loopback address and the receiving interface
  389          * is not loopback.
  390          */
  391         if (__predict_false(
  392             m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) {
  393                 IP6_STATINC(IP6_STAT_IDROPPED);
  394                 goto bad;
  395         }
  396         ip6 = mtod(m, struct ip6_hdr *);
  397         if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
  398                 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
  399                 goto bad;
  400         }
  401         if (in6_setscope(&ip6->ip6_src, rcvif, NULL) ||
  402             in6_setscope(&ip6->ip6_dst, rcvif, NULL)) {
  403                 IP6_STATINC(IP6_STAT_BADSCOPE);
  404                 goto bad;
  405         }
  406 
  407         ro = rtcache_percpu_getref(ip6_forward_rt_percpu);
  408 
  409         /*
  410          * Multicast check
  411          */
  412         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  413                 bool ingroup;
  414 
  415                 in6_ifstat_inc(rcvif, ifs6_in_mcast);
  416                 /*
  417                  * See if we belong to the destination multicast group on the
  418                  * arrival interface.
  419                  */
  420                 ingroup = in6_multi_group(&ip6->ip6_dst, rcvif);
  421                 if (ingroup) {
  422                         ours = 1;
  423                 } else if (!ip6_mrouter) {
  424                         uint64_t *ip6s = IP6_STAT_GETREF();
  425                         ip6s[IP6_STAT_NOTMEMBER]++;
  426                         ip6s[IP6_STAT_CANTFORWARD]++;
  427                         IP6_STAT_PUTREF();
  428                         in6_ifstat_inc(rcvif, ifs6_in_discard);
  429                         goto bad_unref;
  430                 }
  431                 deliverifp = rcvif;
  432                 goto hbhcheck;
  433         }
  434 
  435         sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
  436 
  437         /*
  438          * Unicast check
  439          */
  440         rt = rtcache_lookup2(ro, &u.dst, 1, &hit);
  441         if (hit)
  442                 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
  443         else
  444                 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
  445 
  446         /*
  447          * Accept the packet if the forwarding interface to the destination
  448          * (according to the routing table) is the loopback interface,
  449          * unless the associated route has a gateway.
  450          *
  451          * We don't explicitly match ip6_dst against an interface here. It
  452          * is already done in rtcache_lookup2: rt->rt_ifp->if_type will be
  453          * IFT_LOOP if the packet is for us.
  454          *
  455          * Note that this approach causes to accept a packet if there is a
  456          * route to the loopback interface for the destination of the packet.
  457          * But we think it's even useful in some situations, e.g. when using
  458          * a special daemon which wants to intercept the packet.
  459          */
  460         if (rt != NULL &&
  461             (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
  462             rt->rt_ifp->if_type == IFT_LOOP) {
  463                 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
  464                 int addrok;
  465 
  466                 if (ia6->ia6_flags & IN6_IFF_ANYCAST)
  467                         m->m_flags |= M_ANYCAST6;
  468                 /*
  469                  * packets to a tentative, duplicated, or somehow invalid
  470                  * address must not be accepted.
  471                  */
  472                 if (ia6->ia6_flags & IN6_IFF_NOTREADY)
  473                         addrok = 0;
  474                 else if (ia6->ia6_flags & IN6_IFF_DETACHED &&
  475                     !IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src))
  476                 {
  477                         /* Allow internal traffic to DETACHED addresses */
  478                         struct sockaddr_in6 sin6;
  479                         int s;
  480 
  481                         memset(&sin6, 0, sizeof(sin6));
  482                         sin6.sin6_family = AF_INET6;
  483                         sin6.sin6_len = sizeof(sin6);
  484                         sin6.sin6_addr = ip6->ip6_src;
  485                         s = pserialize_read_enter();
  486                         addrok = (ifa_ifwithaddr(sin6tosa(&sin6)) != NULL);
  487                         pserialize_read_exit(s);
  488                 } else
  489                         addrok = 1;
  490                 if (addrok) {
  491                         /* this address is ready */
  492                         ours = 1;
  493                         deliverifp = ia6->ia_ifp;       /* correct? */
  494                         goto hbhcheck;
  495                 } else {
  496                         /* address is not ready, so discard the packet. */
  497                         char ip6bufs[INET6_ADDRSTRLEN];
  498                         char ip6bufd[INET6_ADDRSTRLEN];
  499                         nd6log(LOG_INFO, "packet to an unready address %s->%s\n",
  500                             IN6_PRINT(ip6bufs, &ip6->ip6_src),
  501                             IN6_PRINT(ip6bufd, &ip6->ip6_dst));
  502 
  503                         IP6_STATINC(IP6_STAT_IDROPPED);
  504                         goto bad_unref;
  505                 }
  506         }
  507 
  508         /*
  509          * FAITH (Firewall Aided Internet Translator)
  510          */
  511 #if defined(NFAITH) && 0 < NFAITH
  512         if (ip6_keepfaith) {
  513                 if (rt != NULL && rt->rt_ifp != NULL &&
  514                     rt->rt_ifp->if_type == IFT_FAITH) {
  515                         /* XXX do we need more sanity checks? */
  516                         ours = 1;
  517                         deliverifp = rt->rt_ifp; /* faith */
  518                         goto hbhcheck;
  519                 }
  520         }
  521 #endif
  522 
  523         /*
  524          * Now there is no reason to process the packet if it's not our own
  525          * and we're not a router.
  526          */
  527         if (!ip6_forwarding) {
  528                 IP6_STATINC(IP6_STAT_CANTFORWARD);
  529                 in6_ifstat_inc(rcvif, ifs6_in_discard);
  530                 goto bad_unref;
  531         }
  532 
  533 hbhcheck:
  534         /*
  535          * Record address information into m_tag, if we don't have one yet.
  536          * Note that we are unable to record it, if the address is not listed
  537          * as our interface address (e.g. multicast addresses, addresses
  538          * within FAITH prefixes and such).
  539          */
  540         if (deliverifp && ip6_getdstifaddr(m) == NULL) {
  541                 struct in6_ifaddr *ia6;
  542                 int s = pserialize_read_enter();
  543 
  544                 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
  545                 /* Depends on ip6_setdstifaddr never sleep */
  546                 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
  547                         /*
  548                          * XXX maybe we should drop the packet here,
  549                          * as we could not provide enough information
  550                          * to the upper layers.
  551                          */
  552                 }
  553                 pserialize_read_exit(s);
  554         }
  555 
  556         /*
  557          * Process Hop-by-Hop options header if it's contained.
  558          * m may be modified in ip6_hopopts_input().
  559          * If a JumboPayload option is included, plen will also be modified.
  560          */
  561         plen = (u_int32_t)ntohs(ip6->ip6_plen);
  562         if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
  563                 struct ip6_hbh *hbh;
  564 
  565                 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
  566                         /* m already freed */
  567                         in6_ifstat_inc(rcvif, ifs6_in_discard);
  568                         rtcache_unref(rt, ro);
  569                         rtcache_percpu_putref(ip6_forward_rt_percpu);
  570                         return;
  571                 }
  572 
  573                 /* adjust pointer */
  574                 ip6 = mtod(m, struct ip6_hdr *);
  575 
  576                 /*
  577                  * if the payload length field is 0 and the next header field
  578                  * indicates Hop-by-Hop Options header, then a Jumbo Payload
  579                  * option MUST be included.
  580                  */
  581                 if (ip6->ip6_plen == 0 && plen == 0) {
  582                         /*
  583                          * Note that if a valid jumbo payload option is
  584                          * contained, ip6_hopopts_input() must set a valid
  585                          * (non-zero) payload length to the variable plen.
  586                          */
  587                         IP6_STATINC(IP6_STAT_BADOPTIONS);
  588                         in6_ifstat_inc(rcvif, ifs6_in_discard);
  589                         in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
  590                         icmp6_error(m, ICMP6_PARAM_PROB,
  591                                     ICMP6_PARAMPROB_HEADER,
  592                                     (char *)&ip6->ip6_plen - (char *)ip6);
  593                         rtcache_unref(rt, ro);
  594                         rtcache_percpu_putref(ip6_forward_rt_percpu);
  595                         return;
  596                 }
  597                 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
  598                         sizeof(struct ip6_hbh));
  599                 if (hbh == NULL) {
  600                         IP6_STATINC(IP6_STAT_TOOSHORT);
  601                         rtcache_unref(rt, ro);
  602                         rtcache_percpu_putref(ip6_forward_rt_percpu);
  603                         return;
  604                 }
  605                 KASSERT(ACCESSIBLE_POINTER(hbh, struct ip6_hdr));
  606                 nxt = hbh->ip6h_nxt;
  607 
  608                 /*
  609                  * accept the packet if a router alert option is included
  610                  * and we act as an IPv6 router.
  611                  */
  612                 if (rtalert != ~0 && ip6_forwarding)
  613                         ours = 1;
  614         } else
  615                 nxt = ip6->ip6_nxt;
  616 
  617         /*
  618          * Check that the amount of data in the buffers is at least much as
  619          * the IPv6 header would have us expect. Trim mbufs if longer than we
  620          * expect. Drop packet if shorter than we expect.
  621          */
  622         if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
  623                 IP6_STATINC(IP6_STAT_TOOSHORT);
  624                 in6_ifstat_inc(rcvif, ifs6_in_truncated);
  625                 goto bad_unref;
  626         }
  627         if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
  628                 if (m->m_len == m->m_pkthdr.len) {
  629                         m->m_len = sizeof(struct ip6_hdr) + plen;
  630                         m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
  631                 } else
  632                         m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
  633         }
  634 
  635         /*
  636          * Forward if desirable.
  637          */
  638         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  639                 /*
  640                  * If we are acting as a multicast router, all
  641                  * incoming multicast packets are passed to the
  642                  * kernel-level multicast forwarding function.
  643                  * The packet is returned (relatively) intact; if
  644                  * ip6_mforward() returns a non-zero value, the packet
  645                  * must be discarded, else it may be accepted below.
  646                  */
  647                 if (ip6_mrouter != NULL) {
  648                         int error;
  649 
  650                         SOFTNET_LOCK();
  651                         error = ip6_mforward(ip6, rcvif, m);
  652                         SOFTNET_UNLOCK();
  653 
  654                         if (error != 0) {
  655                                 rtcache_unref(rt, ro);
  656                                 rtcache_percpu_putref(ip6_forward_rt_percpu);
  657                                 IP6_STATINC(IP6_STAT_CANTFORWARD);
  658                                 goto bad;
  659                         }
  660                 }
  661                 if (!ours) {
  662                         IP6_STATINC(IP6_STAT_CANTFORWARD);
  663                         goto bad_unref;
  664                 }
  665         } else if (!ours) {
  666                 rtcache_unref(rt, ro);
  667                 rtcache_percpu_putref(ip6_forward_rt_percpu);
  668                 ip6_forward(m, srcrt, rcvif);
  669                 return;
  670         }
  671 
  672         ip6 = mtod(m, struct ip6_hdr *);
  673 
  674         /*
  675          * Malicious party may be able to use IPv4 mapped addr to confuse
  676          * tcp/udp stack and bypass security checks (act as if it was from
  677          * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
  678          *
  679          * For SIIT end node behavior, you may want to disable the check.
  680          * However, you will  become vulnerable to attacks using IPv4 mapped
  681          * source.
  682          */
  683         if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
  684             IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
  685                 IP6_STATINC(IP6_STAT_BADSCOPE);
  686                 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
  687                 goto bad_unref;
  688         }
  689 
  690 #ifdef IFA_STATS
  691         if (deliverifp != NULL) {
  692                 struct in6_ifaddr *ia6;
  693                 int s = pserialize_read_enter();
  694                 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
  695                 if (ia6)
  696                         ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
  697                 pserialize_read_exit(s);
  698         }
  699 #endif
  700         IP6_STATINC(IP6_STAT_DELIVERED);
  701         in6_ifstat_inc(deliverifp, ifs6_in_deliver);
  702         nest = 0;
  703 
  704         if (rt != NULL) {
  705                 rtcache_unref(rt, ro);
  706                 rt = NULL;
  707         }
  708         rtcache_percpu_putref(ip6_forward_rt_percpu);
  709 
  710         rh_present = 0;
  711         frg_present = 0;
  712         while (nxt != IPPROTO_DONE) {
  713                 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
  714                         IP6_STATINC(IP6_STAT_TOOMANYHDR);
  715                         in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
  716                         goto bad;
  717                 }
  718 
  719                 M_VERIFY_PACKET(m);
  720 
  721                 /*
  722                  * protection against faulty packet - there should be
  723                  * more sanity checks in header chain processing.
  724                  */
  725                 if (m->m_pkthdr.len < off) {
  726                         IP6_STATINC(IP6_STAT_TOOSHORT);
  727                         in6_ifstat_inc(rcvif, ifs6_in_truncated);
  728                         goto bad;
  729                 }
  730 
  731                 if (nxt == IPPROTO_ROUTING) {
  732                         if (rh_present++) {
  733                                 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
  734                                 IP6_STATINC(IP6_STAT_BADOPTIONS);
  735                                 goto bad;
  736                         }
  737                 } else if (nxt == IPPROTO_FRAGMENT) {
  738                         if (frg_present++) {
  739                                 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
  740                                 IP6_STATINC(IP6_STAT_BADOPTIONS);
  741                                 goto bad;
  742                         }
  743                 }
  744 
  745 #ifdef IPSEC
  746                 if (ipsec_used) {
  747                         /*
  748                          * Enforce IPsec policy checking if we are seeing last
  749                          * header. Note that we do not visit this with
  750                          * protocols with pcb layer code - like udp/tcp/raw ip.
  751                          */
  752                         if ((inet6sw[ip6_protox[nxt]].pr_flags
  753                             & PR_LASTHDR) != 0) {
  754                                 int error;
  755 
  756                                 error = ipsec_ip_input_checkpolicy(m, false);
  757                                 if (error) {
  758                                         IP6_STATINC(IP6_STAT_IPSECDROP_IN);
  759                                         goto bad;
  760                                 }
  761                         }
  762                 }
  763 #endif
  764 
  765                 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
  766         }
  767         return;
  768 
  769 bad_unref:
  770         rtcache_unref(rt, ro);
  771         rtcache_percpu_putref(ip6_forward_rt_percpu);
  772 bad:
  773         m_freem(m);
  774         return;
  775 }
  776 
  777 static bool
  778 ip6_badaddr(struct ip6_hdr *ip6)
  779 {
  780         /* Check against address spoofing/corruption. */
  781         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
  782             IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
  783                 return true;
  784         }
  785 
  786         /*
  787          * The following check is not documented in specs.  A malicious
  788          * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
  789          * and bypass security checks (act as if it was from 127.0.0.1 by using
  790          * IPv6 src ::ffff:127.0.0.1).  Be cautious.
  791          *
  792          * This check chokes if we are in an SIIT cloud.  As none of BSDs
  793          * support IPv4-less kernel compilation, we cannot support SIIT
  794          * environment at all.  So, it makes more sense for us to reject any
  795          * malicious packets for non-SIIT environment, than try to do a
  796          * partial support for SIIT environment.
  797          */
  798         if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
  799             IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
  800                 return true;
  801         }
  802 
  803         /*
  804          * Reject packets with IPv4-compatible IPv6 addresses (RFC4291).
  805          */
  806         if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
  807             IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
  808                 return true;
  809         }
  810 
  811         return false;
  812 }
  813 
  814 /*
  815  * set/grab in6_ifaddr correspond to IPv6 destination address.
  816  */
  817 static struct m_tag *
  818 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
  819 {
  820         struct m_tag *mtag;
  821         struct ip6aux *ip6a;
  822 
  823         mtag = ip6_addaux(m);
  824         if (mtag == NULL)
  825                 return NULL;
  826 
  827         ip6a = (struct ip6aux *)(mtag + 1);
  828         if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) {
  829                 IP6_STATINC(IP6_STAT_BADSCOPE);
  830                 return NULL;
  831         }
  832 
  833         ip6a->ip6a_src = ia->ia_addr.sin6_addr;
  834         ip6a->ip6a_flags = ia->ia6_flags;
  835         return mtag;
  836 }
  837 
  838 const struct ip6aux *
  839 ip6_getdstifaddr(struct mbuf *m)
  840 {
  841         struct m_tag *mtag;
  842 
  843         mtag = ip6_findaux(m);
  844         if (mtag != NULL)
  845                 return (struct ip6aux *)(mtag + 1);
  846         else
  847                 return NULL;
  848 }
  849 
  850 /*
  851  * Hop-by-Hop options header processing. If a valid jumbo payload option is
  852  * included, the real payload length will be stored in plenp.
  853  *
  854  * rtalertp - XXX: should be stored more smart way
  855  */
  856 int
  857 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 
  858         struct mbuf **mp, int *offp)
  859 {
  860         struct mbuf *m = *mp;
  861         int off = *offp, hbhlen;
  862         struct ip6_hbh *hbh;
  863 
  864         /* validation of the length of the header */
  865         IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
  866             sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
  867         if (hbh == NULL) {
  868                 IP6_STATINC(IP6_STAT_TOOSHORT);
  869                 return -1;
  870         }
  871         hbhlen = (hbh->ip6h_len + 1) << 3;
  872         IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
  873             hbhlen);
  874         if (hbh == NULL) {
  875                 IP6_STATINC(IP6_STAT_TOOSHORT);
  876                 return -1;
  877         }
  878         KASSERT(ACCESSIBLE_POINTER(hbh, struct ip6_hdr));
  879         off += hbhlen;
  880         hbhlen -= sizeof(struct ip6_hbh);
  881 
  882         if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
  883             hbhlen, rtalertp, plenp) < 0)
  884                 return -1;
  885 
  886         *offp = off;
  887         *mp = m;
  888         return 0;
  889 }
  890 
  891 /*
  892  * Search header for all Hop-by-hop options and process each option.
  893  * This function is separate from ip6_hopopts_input() in order to
  894  * handle a case where the sending node itself process its hop-by-hop
  895  * options header. In such a case, the function is called from ip6_output().
  896  *
  897  * The function assumes that hbh header is located right after the IPv6 header
  898  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
  899  * opthead + hbhlen is located in continuous memory region.
  900  */
  901 static int
  902 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 
  903         u_int32_t *rtalertp, u_int32_t *plenp)
  904 {
  905         struct ip6_hdr *ip6;
  906         int optlen = 0;
  907         u_int8_t *opt = opthead;
  908         u_int16_t rtalert_val;
  909         u_int32_t jumboplen;
  910         const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
  911 
  912         for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
  913                 switch (*opt) {
  914                 case IP6OPT_PAD1:
  915                         optlen = 1;
  916                         break;
  917                 case IP6OPT_PADN:
  918                         if (hbhlen < IP6OPT_MINLEN) {
  919                                 IP6_STATINC(IP6_STAT_TOOSMALL);
  920                                 goto bad;
  921                         }
  922                         optlen = *(opt + 1) + 2;
  923                         break;
  924                 case IP6OPT_RTALERT:
  925                         /* XXX may need check for alignment */
  926                         if (hbhlen < IP6OPT_RTALERT_LEN) {
  927                                 IP6_STATINC(IP6_STAT_TOOSMALL);
  928                                 goto bad;
  929                         }
  930                         if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
  931                                 IP6_STATINC(IP6_STAT_BADOPTIONS);
  932                                 icmp6_error(m, ICMP6_PARAM_PROB,
  933                                     ICMP6_PARAMPROB_HEADER,
  934                                     erroff + opt + 1 - opthead);
  935                                 return (-1);
  936                         }
  937                         optlen = IP6OPT_RTALERT_LEN;
  938                         memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
  939                         *rtalertp = ntohs(rtalert_val);
  940                         break;
  941                 case IP6OPT_JUMBO:
  942                         /* XXX may need check for alignment */
  943                         if (hbhlen < IP6OPT_JUMBO_LEN) {
  944                                 IP6_STATINC(IP6_STAT_TOOSMALL);
  945                                 goto bad;
  946                         }
  947                         if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
  948                                 IP6_STATINC(IP6_STAT_BADOPTIONS);
  949                                 icmp6_error(m, ICMP6_PARAM_PROB,
  950                                     ICMP6_PARAMPROB_HEADER,
  951                                     erroff + opt + 1 - opthead);
  952                                 return (-1);
  953                         }
  954                         optlen = IP6OPT_JUMBO_LEN;
  955 
  956                         /*
  957                          * IPv6 packets that have non 0 payload length
  958                          * must not contain a jumbo payload option.
  959                          */
  960                         ip6 = mtod(m, struct ip6_hdr *);
  961                         if (ip6->ip6_plen) {
  962                                 IP6_STATINC(IP6_STAT_BADOPTIONS);
  963                                 icmp6_error(m, ICMP6_PARAM_PROB,
  964                                     ICMP6_PARAMPROB_HEADER,
  965                                     erroff + opt - opthead);
  966                                 return (-1);
  967                         }
  968 
  969                         /*
  970                          * We may see jumbolen in unaligned location, so
  971                          * we'd need to perform memcpy().
  972                          */
  973                         memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
  974                         jumboplen = (u_int32_t)htonl(jumboplen);
  975 
  976 #if 1
  977                         /*
  978                          * if there are multiple jumbo payload options,
  979                          * *plenp will be non-zero and the packet will be
  980                          * rejected.
  981                          * the behavior may need some debate in ipngwg -
  982                          * multiple options does not make sense, however,
  983                          * there's no explicit mention in specification.
  984                          */
  985                         if (*plenp != 0) {
  986                                 IP6_STATINC(IP6_STAT_BADOPTIONS);
  987                                 icmp6_error(m, ICMP6_PARAM_PROB,
  988                                     ICMP6_PARAMPROB_HEADER,
  989                                     erroff + opt + 2 - opthead);
  990                                 return (-1);
  991                         }
  992 #endif
  993 
  994                         /*
  995                          * jumbo payload length must be larger than 65535.
  996                          */
  997                         if (jumboplen <= IPV6_MAXPACKET) {
  998                                 IP6_STATINC(IP6_STAT_BADOPTIONS);
  999                                 icmp6_error(m, ICMP6_PARAM_PROB,
 1000                                     ICMP6_PARAMPROB_HEADER,
 1001                                     erroff + opt + 2 - opthead);
 1002                                 return (-1);
 1003                         }
 1004                         *plenp = jumboplen;
 1005 
 1006                         break;
 1007                 default:                /* unknown option */
 1008                         if (hbhlen < IP6OPT_MINLEN) {
 1009                                 IP6_STATINC(IP6_STAT_TOOSMALL);
 1010                                 goto bad;
 1011                         }
 1012                         optlen = ip6_unknown_opt(opt, m,
 1013                             erroff + opt - opthead);
 1014                         if (optlen == -1)
 1015                                 return (-1);
 1016                         optlen += 2;
 1017                         break;
 1018                 }
 1019         }
 1020 
 1021         return (0);
 1022 
 1023   bad:
 1024         m_freem(m);
 1025         return (-1);
 1026 }
 1027 
 1028 /*
 1029  * Unknown option processing.
 1030  * The third argument `off' is the offset from the IPv6 header to the option,
 1031  * which is necessary if the IPv6 header the and option header and IPv6 header
 1032  * is not continuous in order to return an ICMPv6 error.
 1033  */
 1034 int
 1035 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
 1036 {
 1037         struct ip6_hdr *ip6;
 1038 
 1039         switch (IP6OPT_TYPE(*optp)) {
 1040         case IP6OPT_TYPE_SKIP: /* ignore the option */
 1041                 return ((int)*(optp + 1));
 1042         case IP6OPT_TYPE_DISCARD:       /* silently discard */
 1043                 m_freem(m);
 1044                 return (-1);
 1045         case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
 1046                 IP6_STATINC(IP6_STAT_BADOPTIONS);
 1047                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
 1048                 return (-1);
 1049         case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
 1050                 IP6_STATINC(IP6_STAT_BADOPTIONS);
 1051                 ip6 = mtod(m, struct ip6_hdr *);
 1052                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
 1053                     (m->m_flags & (M_BCAST|M_MCAST)))
 1054                         m_freem(m);
 1055                 else
 1056                         icmp6_error(m, ICMP6_PARAM_PROB,
 1057                                     ICMP6_PARAMPROB_OPTION, off);
 1058                 return (-1);
 1059         }
 1060 
 1061         m_freem(m);             /* XXX: NOTREACHED */
 1062         return (-1);
 1063 }
 1064 
 1065 void
 1066 ip6_savecontrol(struct inpcb *inp, struct mbuf **mp, 
 1067         struct ip6_hdr *ip6, struct mbuf *m)
 1068 {
 1069         struct socket *so = inp->inp_socket;
 1070 #ifdef RFC2292
 1071 #define IS2292(x, y)    ((inp->inp_flags & IN6P_RFC2292) ? (x) : (y))
 1072 #else
 1073 #define IS2292(x, y)    (y)
 1074 #endif
 1075 
 1076         KASSERT(m->m_flags & M_PKTHDR);
 1077 
 1078         if (SOOPT_TIMESTAMP(so->so_options))
 1079                 mp = sbsavetimestamp(so->so_options, mp);
 1080 
 1081         /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
 1082         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
 1083                 return;
 1084 
 1085         /* RFC 2292 sec. 5 */
 1086         if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
 1087                 struct in6_pktinfo pi6;
 1088 
 1089                 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
 1090                 in6_clearscope(&pi6.ipi6_addr); /* XXX */
 1091                 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index;
 1092                 *mp = sbcreatecontrol(&pi6, sizeof(pi6),
 1093                     IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
 1094                 if (*mp)
 1095                         mp = &(*mp)->m_next;
 1096         }
 1097 
 1098         if (inp->inp_flags & IN6P_HOPLIMIT) {
 1099                 int hlim = ip6->ip6_hlim & 0xff;
 1100 
 1101                 *mp = sbcreatecontrol(&hlim, sizeof(hlim),
 1102                     IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
 1103                 if (*mp)
 1104                         mp = &(*mp)->m_next;
 1105         }
 1106 
 1107         if ((inp->inp_flags & IN6P_TCLASS) != 0) {
 1108                 u_int32_t flowinfo;
 1109                 int tclass;
 1110 
 1111                 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
 1112                 flowinfo >>= 20;
 1113 
 1114                 tclass = flowinfo & 0xff;
 1115                 *mp = sbcreatecontrol(&tclass, sizeof(tclass),
 1116                     IPV6_TCLASS, IPPROTO_IPV6);
 1117 
 1118                 if (*mp)
 1119                         mp = &(*mp)->m_next;
 1120         }
 1121 
 1122         /*
 1123          * IPV6_HOPOPTS socket option.  Recall that we required super-user
 1124          * privilege for the option (see ip6_ctloutput), but it might be too
 1125          * strict, since there might be some hop-by-hop options which can be
 1126          * returned to normal user.
 1127          * See also RFC3542 section 8 (or RFC2292 section 6).
 1128          */
 1129         if ((inp->inp_flags & IN6P_HOPOPTS) != 0) {
 1130                 /*
 1131                  * Check if a hop-by-hop options header is contatined in the
 1132                  * received packet, and if so, store the options as ancillary
 1133                  * data. Note that a hop-by-hop options header must be
 1134                  * just after the IPv6 header, which fact is assured through
 1135                  * the IPv6 input processing.
 1136                  */
 1137                 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
 1138                 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
 1139                         struct ip6_hbh *hbh;
 1140                         int hbhlen;
 1141                         struct mbuf *ext;
 1142 
 1143                         ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
 1144                             xip6->ip6_nxt);
 1145                         if (ext == NULL) {
 1146                                 IP6_STATINC(IP6_STAT_TOOSHORT);
 1147                                 return;
 1148                         }
 1149                         hbh = mtod(ext, struct ip6_hbh *);
 1150                         hbhlen = (hbh->ip6h_len + 1) << 3;
 1151                         if (hbhlen != ext->m_len) {
 1152                                 m_freem(ext);
 1153                                 IP6_STATINC(IP6_STAT_TOOSHORT);
 1154                                 return;
 1155                         }
 1156 
 1157                         /*
 1158                          * XXX: We copy whole the header even if a jumbo
 1159                          * payload option is included, which option is to
 1160                          * be removed before returning in the RFC 2292.
 1161                          * Note: this constraint is removed in RFC3542.
 1162                          */
 1163                         *mp = sbcreatecontrol(hbh, hbhlen,
 1164                             IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
 1165                             IPPROTO_IPV6);
 1166                         if (*mp)
 1167                                 mp = &(*mp)->m_next;
 1168                         m_freem(ext);
 1169                 }
 1170         }
 1171 
 1172         /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
 1173         if (inp->inp_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
 1174                 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
 1175                 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
 1176 
 1177                 /*
 1178                  * Search for destination options headers or routing
 1179                  * header(s) through the header chain, and stores each
 1180                  * header as ancillary data.
 1181                  * Note that the order of the headers remains in
 1182                  * the chain of ancillary data.
 1183                  */
 1184                 for (;;) {      /* is explicit loop prevention necessary? */
 1185                         struct ip6_ext *ip6e = NULL;
 1186                         int elen;
 1187                         struct mbuf *ext = NULL;
 1188 
 1189                         /*
 1190                          * if it is not an extension header, don't try to
 1191                          * pull it from the chain.
 1192                          */
 1193                         switch (nxt) {
 1194                         case IPPROTO_DSTOPTS:
 1195                         case IPPROTO_ROUTING:
 1196                         case IPPROTO_HOPOPTS:
 1197                         case IPPROTO_AH: /* is it possible? */
 1198                                 break;
 1199                         default:
 1200                                 goto loopend;
 1201                         }
 1202 
 1203                         ext = ip6_pullexthdr(m, off, nxt);
 1204                         if (ext == NULL) {
 1205                                 IP6_STATINC(IP6_STAT_TOOSHORT);
 1206                                 return;
 1207                         }
 1208                         ip6e = mtod(ext, struct ip6_ext *);
 1209                         if (nxt == IPPROTO_AH)
 1210                                 elen = (ip6e->ip6e_len + 2) << 2;
 1211                         else
 1212                                 elen = (ip6e->ip6e_len + 1) << 3;
 1213                         if (elen != ext->m_len) {
 1214                                 m_freem(ext);
 1215                                 IP6_STATINC(IP6_STAT_TOOSHORT);
 1216                                 return;
 1217                         }
 1218                         KASSERT(ACCESSIBLE_POINTER(ip6e, struct ip6_hdr));
 1219 
 1220                         switch (nxt) {
 1221                         case IPPROTO_DSTOPTS:
 1222                                 if (!(inp->inp_flags & IN6P_DSTOPTS))
 1223                                         break;
 1224 
 1225                                 *mp = sbcreatecontrol(ip6e, elen,
 1226                                     IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
 1227                                     IPPROTO_IPV6);
 1228                                 if (*mp)
 1229                                         mp = &(*mp)->m_next;
 1230                                 break;
 1231 
 1232                         case IPPROTO_ROUTING:
 1233                                 if (!(inp->inp_flags & IN6P_RTHDR))
 1234                                         break;
 1235 
 1236                                 *mp = sbcreatecontrol(ip6e, elen,
 1237                                     IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
 1238                                     IPPROTO_IPV6);
 1239                                 if (*mp)
 1240                                         mp = &(*mp)->m_next;
 1241                                 break;
 1242 
 1243                         case IPPROTO_HOPOPTS:
 1244                         case IPPROTO_AH: /* is it possible? */
 1245                                 break;
 1246 
 1247                         default:
 1248                                 /*
 1249                                  * other cases have been filtered in the above.
 1250                                  * none will visit this case.  here we supply
 1251                                  * the code just in case (nxt overwritten or
 1252                                  * other cases).
 1253                                  */
 1254                                 m_freem(ext);
 1255                                 goto loopend;
 1256 
 1257                         }
 1258 
 1259                         /* proceed with the next header. */
 1260                         off += elen;
 1261                         nxt = ip6e->ip6e_nxt;
 1262                         ip6e = NULL;
 1263                         m_freem(ext);
 1264                         ext = NULL;
 1265                 }
 1266           loopend:
 1267                 ;
 1268         }
 1269 }
 1270 #undef IS2292
 1271 
 1272 
 1273 void
 1274 ip6_notify_pmtu(struct inpcb *inp, const struct sockaddr_in6 *dst,
 1275     uint32_t *mtu)
 1276 {
 1277         struct socket *so;
 1278         struct mbuf *m_mtu;
 1279         struct ip6_mtuinfo mtuctl;
 1280 
 1281         so = inp->inp_socket;
 1282 
 1283         if (mtu == NULL)
 1284                 return;
 1285 
 1286         KASSERT(so != NULL);
 1287 
 1288         memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
 1289         mtuctl.ip6m_mtu = *mtu;
 1290         mtuctl.ip6m_addr = *dst;
 1291         if (sa6_recoverscope(&mtuctl.ip6m_addr))
 1292                 return;
 1293 
 1294         if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl),
 1295             IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
 1296                 return;
 1297 
 1298         if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
 1299             == 0) {
 1300                 soroverflow(so);
 1301                 m_freem(m_mtu);
 1302         } else
 1303                 sorwakeup(so);
 1304 
 1305         return;
 1306 }
 1307 
 1308 /*
 1309  * pull single extension header from mbuf chain.  returns single mbuf that
 1310  * contains the result, or NULL on error.
 1311  */
 1312 static struct mbuf *
 1313 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
 1314 {
 1315         struct ip6_ext ip6e;
 1316         size_t elen;
 1317         struct mbuf *n;
 1318 
 1319         if (off + sizeof(ip6e) > m->m_pkthdr.len)
 1320                 return NULL;
 1321 
 1322         m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
 1323         if (nxt == IPPROTO_AH)
 1324                 elen = (ip6e.ip6e_len + 2) << 2;
 1325         else
 1326                 elen = (ip6e.ip6e_len + 1) << 3;
 1327 
 1328         if (off + elen > m->m_pkthdr.len)
 1329                 return NULL;
 1330 
 1331         MGET(n, M_DONTWAIT, MT_DATA);
 1332         if (n && elen >= MLEN) {
 1333                 MCLGET(n, M_DONTWAIT);
 1334                 if ((n->m_flags & M_EXT) == 0) {
 1335                         m_free(n);
 1336                         n = NULL;
 1337                 }
 1338         }
 1339         if (!n)
 1340                 return NULL;
 1341 
 1342         n->m_len = 0;
 1343         if (elen >= M_TRAILINGSPACE(n)) {
 1344                 m_free(n);
 1345                 return NULL;
 1346         }
 1347 
 1348         m_copydata(m, off, elen, mtod(n, void *));
 1349         n->m_len = elen;
 1350         return n;
 1351 }
 1352 
 1353 /*
 1354  * Get offset to the previous header followed by the header
 1355  * currently processed.
 1356  */
 1357 int
 1358 ip6_get_prevhdr(struct mbuf *m, int off)
 1359 {
 1360         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1361 
 1362         if (off == sizeof(struct ip6_hdr)) {
 1363                 return offsetof(struct ip6_hdr, ip6_nxt);
 1364         } else if (off < sizeof(struct ip6_hdr)) {
 1365                 panic("%s: off < sizeof(struct ip6_hdr)", __func__);
 1366         } else {
 1367                 int len, nlen, nxt;
 1368                 struct ip6_ext ip6e;
 1369 
 1370                 nxt = ip6->ip6_nxt;
 1371                 len = sizeof(struct ip6_hdr);
 1372                 nlen = 0;
 1373                 while (len < off) {
 1374                         m_copydata(m, len, sizeof(ip6e), &ip6e);
 1375 
 1376                         switch (nxt) {
 1377                         case IPPROTO_FRAGMENT:
 1378                                 nlen = sizeof(struct ip6_frag);
 1379                                 break;
 1380                         case IPPROTO_AH:
 1381                                 nlen = (ip6e.ip6e_len + 2) << 2;
 1382                                 break;
 1383                         default:
 1384                                 nlen = (ip6e.ip6e_len + 1) << 3;
 1385                                 break;
 1386                         }
 1387                         len += nlen;
 1388                         nxt = ip6e.ip6e_nxt;
 1389                 }
 1390 
 1391                 return (len - nlen);
 1392         }
 1393 }
 1394 
 1395 /*
 1396  * get next header offset.  m will be retained.
 1397  */
 1398 int
 1399 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
 1400 {
 1401         struct ip6_hdr ip6;
 1402         struct ip6_ext ip6e;
 1403         struct ip6_frag fh;
 1404 
 1405         /* just in case */
 1406         if (m == NULL)
 1407                 panic("%s: m == NULL", __func__);
 1408         if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
 1409                 return -1;
 1410 
 1411         switch (proto) {
 1412         case IPPROTO_IPV6:
 1413                 /* do not chase beyond intermediate IPv6 headers */
 1414                 if (off != 0)
 1415                         return -1;
 1416                 if (m->m_pkthdr.len < off + sizeof(ip6))
 1417                         return -1;
 1418                 m_copydata(m, off, sizeof(ip6), (void *)&ip6);
 1419                 if (nxtp)
 1420                         *nxtp = ip6.ip6_nxt;
 1421                 off += sizeof(ip6);
 1422                 return off;
 1423 
 1424         case IPPROTO_FRAGMENT:
 1425                 /*
 1426                  * terminate parsing if it is not the first fragment,
 1427                  * it does not make sense to parse through it.
 1428                  */
 1429                 if (m->m_pkthdr.len < off + sizeof(fh))
 1430                         return -1;
 1431                 m_copydata(m, off, sizeof(fh), (void *)&fh);
 1432                 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
 1433                         return -1;
 1434                 if (nxtp)
 1435                         *nxtp = fh.ip6f_nxt;
 1436                 off += sizeof(struct ip6_frag);
 1437                 return off;
 1438 
 1439         case IPPROTO_AH:
 1440                 if (m->m_pkthdr.len < off + sizeof(ip6e))
 1441                         return -1;
 1442                 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
 1443                 if (nxtp)
 1444                         *nxtp = ip6e.ip6e_nxt;
 1445                 off += (ip6e.ip6e_len + 2) << 2;
 1446                 if (m->m_pkthdr.len < off)
 1447                         return -1;
 1448                 return off;
 1449 
 1450         case IPPROTO_HOPOPTS:
 1451         case IPPROTO_ROUTING:
 1452         case IPPROTO_DSTOPTS:
 1453                 if (m->m_pkthdr.len < off + sizeof(ip6e))
 1454                         return -1;
 1455                 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
 1456                 if (nxtp)
 1457                         *nxtp = ip6e.ip6e_nxt;
 1458                 off += (ip6e.ip6e_len + 1) << 3;
 1459                 if (m->m_pkthdr.len < off)
 1460                         return -1;
 1461                 return off;
 1462 
 1463         case IPPROTO_NONE:
 1464         case IPPROTO_ESP:
 1465         case IPPROTO_IPCOMP:
 1466                 /* give up */
 1467                 return -1;
 1468 
 1469         default:
 1470                 return -1;
 1471         }
 1472 }
 1473 
 1474 /*
 1475  * get offset for the last header in the chain.  m will be kept untainted.
 1476  */
 1477 int
 1478 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
 1479 {
 1480         int newoff;
 1481         int nxt;
 1482 
 1483         if (!nxtp) {
 1484                 nxt = -1;
 1485                 nxtp = &nxt;
 1486         }
 1487         for (;;) {
 1488                 newoff = ip6_nexthdr(m, off, proto, nxtp);
 1489                 if (newoff < 0)
 1490                         return off;
 1491                 else if (newoff < off)
 1492                         return -1;      /* invalid */
 1493                 else if (newoff == off)
 1494                         return newoff;
 1495 
 1496                 off = newoff;
 1497                 proto = *nxtp;
 1498         }
 1499 }
 1500 
 1501 static struct m_tag *
 1502 ip6_addaux(struct mbuf *m)
 1503 {
 1504         struct m_tag *mtag;
 1505 
 1506         mtag = m_tag_find(m, PACKET_TAG_INET6);
 1507         if (!mtag) {
 1508                 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
 1509                     M_NOWAIT);
 1510                 if (mtag) {
 1511                         m_tag_prepend(m, mtag);
 1512                         memset(mtag + 1, 0, sizeof(struct ip6aux));
 1513                 }
 1514         }
 1515         return mtag;
 1516 }
 1517 
 1518 static struct m_tag *
 1519 ip6_findaux(struct mbuf *m)
 1520 {
 1521         struct m_tag *mtag;
 1522 
 1523         mtag = m_tag_find(m, PACKET_TAG_INET6);
 1524         return mtag;
 1525 }
 1526 
 1527 static void
 1528 ip6_delaux(struct mbuf *m)
 1529 {
 1530         struct m_tag *mtag;
 1531 
 1532         mtag = m_tag_find(m, PACKET_TAG_INET6);
 1533         if (mtag)
 1534                 m_tag_delete(m, mtag);
 1535 }
 1536 
 1537 /*
 1538  * System control for IP6
 1539  */
 1540 
 1541 const u_char inet6ctlerrmap[PRC_NCMDS] = {
 1542         0,              0,              0,              0,
 1543         0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
 1544         EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
 1545         EMSGSIZE,       EHOSTUNREACH,   0,              0,
 1546         0,              0,              0,              0,
 1547         ENOPROTOOPT
 1548 };
 1549 
 1550 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS);
 1551 
 1552 static int
 1553 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
 1554 {
 1555 
 1556         return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
 1557 }
 1558 
 1559 static void
 1560 sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
 1561 {
 1562         const struct sysctlnode *ip6_node;
 1563 
 1564         sysctl_createv(clog, 0, NULL, NULL,
 1565                        CTLFLAG_PERMANENT,
 1566                        CTLTYPE_NODE, "inet6",
 1567                        SYSCTL_DESCR("PF_INET6 related settings"),
 1568                        NULL, 0, NULL, 0,
 1569                        CTL_NET, PF_INET6, CTL_EOL);
 1570         sysctl_createv(clog, 0, NULL, &ip6_node,
 1571                        CTLFLAG_PERMANENT,
 1572                        CTLTYPE_NODE, "ip6",
 1573                        SYSCTL_DESCR("IPv6 related settings"),
 1574                        NULL, 0, NULL, 0,
 1575                        CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
 1576 
 1577         sysctl_createv(clog, 0, NULL, NULL,
 1578                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1579                        CTLTYPE_INT, "forwarding",
 1580                        SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
 1581                        NULL, 0, &ip6_forwarding, 0,
 1582                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1583                        IPV6CTL_FORWARDING, CTL_EOL);
 1584         sysctl_createv(clog, 0, NULL, NULL,
 1585                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1586                        CTLTYPE_INT, "redirect",
 1587                        SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
 1588                        NULL, 0, &ip6_sendredirects, 0,
 1589                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1590                        IPV6CTL_SENDREDIRECTS, CTL_EOL);
 1591         sysctl_createv(clog, 0, NULL, NULL,
 1592                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1593                        CTLTYPE_INT, "hlim",
 1594                        SYSCTL_DESCR("Hop limit for an INET6 datagram"),
 1595                        NULL, 0, &ip6_defhlim, 0,
 1596                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1597                        IPV6CTL_DEFHLIM, CTL_EOL);
 1598         sysctl_createv(clog, 0, NULL, NULL,
 1599                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1600                        CTLTYPE_INT, "maxfragpackets",
 1601                        SYSCTL_DESCR("Maximum number of fragments to buffer "
 1602                                     "for reassembly"),
 1603                        NULL, 0, &ip6_maxfragpackets, 0,
 1604                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1605                        IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
 1606 
 1607         pktq_sysctl_setup(ip6_pktq, clog, ip6_node, IPV6CTL_IFQ);
 1608 
 1609         sysctl_createv(clog, 0, NULL, NULL,
 1610                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1611                        CTLTYPE_INT, "keepfaith",
 1612                        SYSCTL_DESCR("Activate faith interface"),
 1613                        NULL, 0, &ip6_keepfaith, 0,
 1614                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1615                        IPV6CTL_KEEPFAITH, CTL_EOL);
 1616         sysctl_createv(clog, 0, NULL, NULL,
 1617                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1618                        CTLTYPE_INT, "log_interval",
 1619                        SYSCTL_DESCR("Minimum interval between logging "
 1620                                     "unroutable packets"),
 1621                        NULL, 0, &ip6_log_interval, 0,
 1622                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1623                        IPV6CTL_LOG_INTERVAL, CTL_EOL);
 1624         sysctl_createv(clog, 0, NULL, NULL,
 1625                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1626                        CTLTYPE_INT, "hdrnestlimit",
 1627                        SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
 1628                        NULL, 0, &ip6_hdrnestlimit, 0,
 1629                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1630                        IPV6CTL_HDRNESTLIMIT, CTL_EOL);
 1631         sysctl_createv(clog, 0, NULL, NULL,
 1632                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1633                        CTLTYPE_INT, "dad_count",
 1634                        SYSCTL_DESCR("Number of Duplicate Address Detection "
 1635                                     "probes to send"),
 1636                        NULL, 0, &ip6_dad_count, 0,
 1637                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1638                        IPV6CTL_DAD_COUNT, CTL_EOL);
 1639         sysctl_createv(clog, 0, NULL, NULL,
 1640                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1641                        CTLTYPE_INT, "auto_flowlabel",
 1642                        SYSCTL_DESCR("Assign random IPv6 flow labels"),
 1643                        NULL, 0, &ip6_auto_flowlabel, 0,
 1644                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1645                        IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
 1646         sysctl_createv(clog, 0, NULL, NULL,
 1647                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1648                        CTLTYPE_INT, "defmcasthlim",
 1649                        SYSCTL_DESCR("Default multicast hop limit"),
 1650                        NULL, 0, &ip6_defmcasthlim, 0,
 1651                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1652                        IPV6CTL_DEFMCASTHLIM, CTL_EOL);
 1653         sysctl_createv(clog, 0, NULL, NULL,
 1654                        CTLFLAG_PERMANENT,
 1655                        CTLTYPE_STRING, "kame_version",
 1656                        SYSCTL_DESCR("KAME Version"),
 1657                        NULL, 0, __UNCONST(__KAME_VERSION), 0,
 1658                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1659                        IPV6CTL_KAME_VERSION, CTL_EOL);
 1660         sysctl_createv(clog, 0, NULL, NULL,
 1661                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1662                        CTLTYPE_INT, "use_deprecated",
 1663                        SYSCTL_DESCR("Allow use of deprecated addresses as "
 1664                                     "source addresses"),
 1665                        NULL, 0, &ip6_use_deprecated, 0,
 1666                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1667                        IPV6CTL_USE_DEPRECATED, CTL_EOL);
 1668         sysctl_createv(clog, 0, NULL, NULL,
 1669                        CTLFLAG_PERMANENT
 1670 #ifndef INET6_BINDV6ONLY
 1671                        |CTLFLAG_READWRITE,
 1672 #endif
 1673                        CTLTYPE_INT, "v6only",
 1674                        SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
 1675                                     "to PF_INET sockets"),
 1676                        NULL, 0, &ip6_v6only, 0,
 1677                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1678                        IPV6CTL_V6ONLY, CTL_EOL);
 1679         sysctl_createv(clog, 0, NULL, NULL,
 1680                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1681                        CTLTYPE_INT, "anonportmin",
 1682                        SYSCTL_DESCR("Lowest ephemeral port number to assign"),
 1683                        sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
 1684                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1685                        IPV6CTL_ANONPORTMIN, CTL_EOL);
 1686         sysctl_createv(clog, 0, NULL, NULL,
 1687                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1688                        CTLTYPE_INT, "anonportmax",
 1689                        SYSCTL_DESCR("Highest ephemeral port number to assign"),
 1690                        sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
 1691                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1692                        IPV6CTL_ANONPORTMAX, CTL_EOL);
 1693 #ifndef IPNOPRIVPORTS
 1694         sysctl_createv(clog, 0, NULL, NULL,
 1695                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1696                        CTLTYPE_INT, "lowportmin",
 1697                        SYSCTL_DESCR("Lowest privileged ephemeral port number "
 1698                                     "to assign"),
 1699                        sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
 1700                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1701                        IPV6CTL_LOWPORTMIN, CTL_EOL);
 1702         sysctl_createv(clog, 0, NULL, NULL,
 1703                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1704                        CTLTYPE_INT, "lowportmax",
 1705                        SYSCTL_DESCR("Highest privileged ephemeral port number "
 1706                                     "to assign"),
 1707                        sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
 1708                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1709                        IPV6CTL_LOWPORTMAX, CTL_EOL);
 1710 #endif /* IPNOPRIVPORTS */
 1711         sysctl_createv(clog, 0, NULL, NULL,
 1712                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1713                        CTLTYPE_INT, "auto_linklocal",
 1714                        SYSCTL_DESCR("Default value of per-interface flag for "
 1715                                     "adding an IPv6 link-local address to "
 1716                                     "interfaces when attached"),
 1717                        NULL, 0, &ip6_auto_linklocal, 0,
 1718                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1719                        IPV6CTL_AUTO_LINKLOCAL, CTL_EOL);
 1720         sysctl_createv(clog, 0, NULL, NULL,
 1721                        CTLFLAG_PERMANENT|CTLFLAG_READONLY,
 1722                        CTLTYPE_STRUCT, "addctlpolicy",
 1723                        SYSCTL_DESCR("Return the current address control"
 1724                            " policy"),
 1725                        sysctl_net_inet6_addrctlpolicy, 0, NULL, 0,
 1726                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1727                        IPV6CTL_ADDRCTLPOLICY, CTL_EOL);
 1728         sysctl_createv(clog, 0, NULL, NULL,
 1729                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1730                        CTLTYPE_INT, "prefer_tempaddr",
 1731                        SYSCTL_DESCR("Prefer temporary address as source "
 1732                                     "address"),
 1733                        NULL, 0, &ip6_prefer_tempaddr, 0,
 1734                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1735                        CTL_CREATE, CTL_EOL);
 1736         sysctl_createv(clog, 0, NULL, NULL,
 1737                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1738                        CTLTYPE_INT, "maxfrags",
 1739                        SYSCTL_DESCR("Maximum fragments in reassembly queue"),
 1740                        NULL, 0, &ip6_maxfrags, 0,
 1741                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1742                        IPV6CTL_MAXFRAGS, CTL_EOL);
 1743         sysctl_createv(clog, 0, NULL, NULL,
 1744                        CTLFLAG_PERMANENT,
 1745                        CTLTYPE_STRUCT, "stats",
 1746                        SYSCTL_DESCR("IPv6 statistics"),
 1747                        sysctl_net_inet6_ip6_stats, 0, NULL, 0,
 1748                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1749                        IPV6CTL_STATS, CTL_EOL);
 1750         sysctl_createv(clog, 0, NULL, NULL,
 1751                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1752                        CTLTYPE_INT, "use_defaultzone",
 1753                        SYSCTL_DESCR("Whether to use the default scope zones"),
 1754                        NULL, 0, &ip6_use_defzone, 0,
 1755                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1756                        IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
 1757         sysctl_createv(clog, 0, NULL, NULL,
 1758                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1759                        CTLTYPE_INT, "mcast_pmtu",
 1760                        SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
 1761                        NULL, 0, &ip6_mcast_pmtu, 0,
 1762                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1763                        CTL_CREATE, CTL_EOL);
 1764         /* anonportalgo RFC6056 subtree */
 1765         const struct sysctlnode *portalgo_node;
 1766         sysctl_createv(clog, 0, NULL, &portalgo_node,
 1767                        CTLFLAG_PERMANENT,
 1768                        CTLTYPE_NODE, "anonportalgo",
 1769                        SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"),
 1770                        NULL, 0, NULL, 0,
 1771                        CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL);
 1772         sysctl_createv(clog, 0, &portalgo_node, NULL,
 1773                        CTLFLAG_PERMANENT,
 1774                        CTLTYPE_STRING, "available",
 1775                        SYSCTL_DESCR("available algorithms"),
 1776                        sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
 1777                        CTL_CREATE, CTL_EOL);
 1778         sysctl_createv(clog, 0, &portalgo_node, NULL,
 1779                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1780                        CTLTYPE_STRING, "selected",
 1781                        SYSCTL_DESCR("selected algorithm"),
 1782                        sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN,
 1783                        CTL_CREATE, CTL_EOL);
 1784         sysctl_createv(clog, 0, &portalgo_node, NULL,
 1785                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1786                        CTLTYPE_STRUCT, "reserve",
 1787                        SYSCTL_DESCR("bitmap of reserved ports"),
 1788                        sysctl_portalgo_reserve6, 0, NULL, 0,
 1789                        CTL_CREATE, CTL_EOL);
 1790         sysctl_createv(clog, 0, NULL, NULL,
 1791                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1792                        CTLTYPE_INT, "neighborgcthresh",
 1793                        SYSCTL_DESCR("Maximum number of entries in neighbor"
 1794                         " cache"),
 1795                        NULL, 1, &ip6_neighborgcthresh, 0,
 1796                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1797                        CTL_CREATE, CTL_EOL);
 1798         sysctl_createv(clog, 0, NULL, NULL,
 1799                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1800                        CTLTYPE_INT, "maxdynroutes",
 1801                        SYSCTL_DESCR("Maximum number of routes created via"
 1802                            " redirect"),
 1803                        NULL, 1, &ip6_maxdynroutes, 0,
 1804                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1805                        CTL_CREATE, CTL_EOL);
 1806         sysctl_createv(clog, 0, NULL, NULL,
 1807                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1808                        CTLTYPE_INT, "param_rt_msg",
 1809                        SYSCTL_DESCR("How to send parameter changing"
 1810                            " routing message"),
 1811                        NULL, 0, &ip6_param_rt_msg, 0,
 1812                        CTL_NET, PF_INET6, IPPROTO_IPV6,
 1813                        CTL_CREATE, CTL_EOL);
 1814 }
 1815 
 1816 void
 1817 ip6_statinc(u_int stat)
 1818 {
 1819 
 1820         KASSERT(stat < IP6_NSTATS);
 1821         IP6_STATINC(stat);
 1822 }

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