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 /*      $FreeBSD: src/sys/netinet6/ip6_input.c,v 1.11.2.15 2003/01/24 05:11:35 sam Exp $        */
    2 /*      $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei 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 "opt_ip6fw.h"
   65 #include "opt_inet.h"
   66 #include "opt_inet6.h"
   67 #include "opt_ipsec.h"
   68 
   69 #include <sys/param.h>
   70 #include <sys/systm.h>
   71 #include <sys/malloc.h>
   72 #include <sys/mbuf.h>
   73 #include <sys/domain.h>
   74 #include <sys/protosw.h>
   75 #include <sys/socket.h>
   76 #include <sys/socketvar.h>
   77 #include <sys/errno.h>
   78 #include <sys/time.h>
   79 #include <sys/kernel.h>
   80 #include <sys/syslog.h>
   81 #include <sys/proc.h>
   82 #include <sys/priv.h>
   83 
   84 #include <net/if.h>
   85 #include <net/if_types.h>
   86 #include <net/if_dl.h>
   87 #include <net/route.h>
   88 #include <net/netisr.h>
   89 #include <net/pfil.h>
   90 
   91 #include <sys/thread2.h>
   92 #include <sys/msgport2.h>
   93 #include <net/netmsg2.h>
   94 #include <net/netisr2.h>
   95 
   96 #include <netinet/in.h>
   97 #include <netinet/in_systm.h>
   98 #ifdef INET
   99 #include <netinet/ip.h>
  100 #include <netinet/ip_icmp.h>
  101 #endif /* INET */
  102 #include <netinet/ip6.h>
  103 #include <netinet6/in6_var.h>
  104 #include <netinet6/ip6_var.h>
  105 #include <netinet/in_pcb.h>
  106 #include <netinet/icmp6.h>
  107 #include <netinet6/scope6_var.h>
  108 #include <netinet6/in6_ifattach.h>
  109 #include <netinet6/nd6.h>
  110 #include <netinet6/in6_prefix.h>
  111 
  112 #ifdef IPSEC
  113 #include <netinet6/ipsec.h>
  114 #ifdef INET6
  115 #include <netinet6/ipsec6.h>
  116 #endif
  117 #endif
  118 
  119 #ifdef FAST_IPSEC
  120 #include <netproto/ipsec/ipsec.h>
  121 #include <netproto/ipsec/ipsec6.h>
  122 #define IPSEC
  123 #endif /* FAST_IPSEC */
  124 
  125 #include <net/ip6fw/ip6_fw.h>
  126 
  127 #include <netinet6/ip6protosw.h>
  128 
  129 #include <net/net_osdep.h>
  130 
  131 extern struct domain inet6domain;
  132 extern struct protosw inet6sw[];
  133 
  134 u_char ip6_protox[IPPROTO_MAX];
  135 struct in6_ifaddr *in6_ifaddr;
  136 
  137 extern struct callout in6_tmpaddrtimer_ch;
  138 
  139 int ip6_forward_srcrt;                  /* XXX */
  140 int ip6_sourcecheck;                    /* XXX */
  141 int ip6_sourcecheck_interval;           /* XXX */
  142 
  143 int ip6_ours_check_algorithm;
  144 
  145 struct pfil_head inet6_pfil_hook;
  146 
  147 /* firewall hooks */
  148 ip6_fw_chk_t *ip6_fw_chk_ptr;
  149 ip6_fw_ctl_t *ip6_fw_ctl_ptr;
  150 int ip6_fw_enable = 1;
  151 
  152 struct ip6stat ip6stat;
  153 
  154 static void ip6_init2 (void *);
  155 static struct ip6aux *ip6_setdstifaddr (struct mbuf *, struct in6_ifaddr *);
  156 static int ip6_hopopts_input (u_int32_t *, u_int32_t *, struct mbuf **, int *);
  157 static void ip6_input(netmsg_t msg);
  158 #ifdef PULLDOWN_TEST
  159 static struct mbuf *ip6_pullexthdr (struct mbuf *, size_t, int);
  160 #endif
  161 static void transport6_processing_handler(netmsg_t netmsg);
  162 
  163 /*
  164  * IP6 initialization: fill in IP6 protocol switch table.
  165  * All protocols not implemented in kernel go to raw IP6 protocol handler.
  166  */
  167 void
  168 ip6_init(void)
  169 {
  170         struct protosw *pr;
  171         int i;
  172         struct timeval tv;
  173 
  174         pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
  175         if (pr == NULL)
  176                 panic("ip6_init");
  177         for (i = 0; i < IPPROTO_MAX; i++)
  178                 ip6_protox[i] = pr - inet6sw;
  179         for (pr = inet6domain.dom_protosw;
  180             pr < inet6domain.dom_protoswNPROTOSW; pr++)
  181                 if (pr->pr_domain->dom_family == PF_INET6 &&
  182                     pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
  183                         ip6_protox[pr->pr_protocol] = pr - inet6sw;
  184 
  185         inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
  186         inet6_pfil_hook.ph_af = AF_INET6;
  187         if ((i = pfil_head_register(&inet6_pfil_hook)) != 0) {
  188                 kprintf("%s: WARNING: unable to register pfil hook, "
  189                         "error %d\n", __func__, i);
  190         }
  191 
  192         netisr_register(NETISR_IPV6, ip6_input, NULL); /* XXX hashfn */
  193         scope6_init();
  194         addrsel_policy_init();
  195         nd6_init();
  196         frag6_init();
  197         /*
  198          * in many cases, random() here does NOT return random number
  199          * as initialization during bootstrap time occur in fixed order.
  200          */
  201         microtime(&tv);
  202         ip6_flow_seq = krandom() ^ tv.tv_usec;
  203         microtime(&tv);
  204         ip6_desync_factor = (krandom() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
  205 }
  206 
  207 static void
  208 ip6_init2(void *dummy)
  209 {
  210         /* nd6_timer_init */
  211         callout_init(&nd6_timer_ch);
  212         callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
  213 
  214         /* router renumbering prefix list maintenance */
  215         callout_init(&in6_rr_timer_ch);
  216         callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
  217 
  218         /* timer for regeneranation of temporary addresses randomize ID */
  219         callout_init(&in6_tmpaddrtimer_ch);
  220         callout_reset(&in6_tmpaddrtimer_ch,
  221                       (ip6_temp_preferred_lifetime - ip6_desync_factor -
  222                        ip6_temp_regen_advance) * hz,
  223                       in6_tmpaddrtimer, NULL);
  224 }
  225 
  226 /* cheat */
  227 /* This must be after route_init(), which is now SI_ORDER_THIRD */
  228 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
  229 
  230 extern struct   route_in6 ip6_forward_rt;
  231 
  232 static
  233 void
  234 ip6_input(netmsg_t msg)
  235 {
  236         struct mbuf *m = msg->packet.nm_packet;
  237         struct ip6_hdr *ip6;
  238         int off = sizeof(struct ip6_hdr), nest;
  239         u_int32_t plen;
  240         u_int32_t rtalert = ~0;
  241         int nxt, ours = 0, rh_present = 0;
  242         struct ifnet *deliverifp = NULL;
  243         struct in6_addr odst;
  244         int srcrt = 0;
  245 
  246 #ifdef IPSEC
  247         /*
  248          * should the inner packet be considered authentic?
  249          * see comment in ah4_input().
  250          */
  251         if (m) {
  252                 m->m_flags &= ~M_AUTHIPHDR;
  253                 m->m_flags &= ~M_AUTHIPDGM;
  254         }
  255 #endif
  256 
  257         /*
  258          * make sure we don't have onion peering information into m_aux.
  259          */
  260         ip6_delaux(m);
  261 
  262         /*
  263          * mbuf statistics
  264          */
  265         if (m->m_flags & M_EXT) {
  266                 if (m->m_next)
  267                         ip6stat.ip6s_mext2m++;
  268                 else
  269                         ip6stat.ip6s_mext1++;
  270         } else {
  271 #define M2MMAX  NELEM(ip6stat.ip6s_m2m)
  272                 if (m->m_next) {
  273                         if (m->m_flags & M_LOOP) {
  274                                 ip6stat.ip6s_m2m[loif[0].if_index]++;   /* XXX */
  275                         } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
  276                                 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
  277                         else
  278                                 ip6stat.ip6s_m2m[0]++;
  279                 } else
  280                         ip6stat.ip6s_m1++;
  281 #undef M2MMAX
  282         }
  283 
  284         in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
  285         ip6stat.ip6s_total++;
  286 
  287 #ifndef PULLDOWN_TEST
  288         /*
  289          * L2 bridge code and some other code can return mbuf chain
  290          * that does not conform to KAME requirement.  too bad.
  291          * XXX: fails to join if interface MTU > MCLBYTES.  jumbogram?
  292          */
  293         if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
  294                 struct mbuf *n;
  295 
  296                 n = m_getb(m->m_pkthdr.len, MB_DONTWAIT, MT_HEADER, M_PKTHDR);
  297                 if (n == NULL)
  298                         goto bad;
  299                 M_MOVE_PKTHDR(n, m);
  300 
  301                 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
  302                 n->m_len = n->m_pkthdr.len;
  303                 m_freem(m);
  304                 m = n;
  305         }
  306         IP6_EXTHDR_CHECK_VOIDRET(m, 0, sizeof(struct ip6_hdr));
  307 #endif
  308 
  309         if (m->m_len < sizeof(struct ip6_hdr)) {
  310                 struct ifnet *inifp;
  311                 inifp = m->m_pkthdr.rcvif;
  312                 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
  313                         ip6stat.ip6s_toosmall++;
  314                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
  315                         goto bad2;
  316                 }
  317         }
  318 
  319         ip6 = mtod(m, struct ip6_hdr *);
  320 
  321         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
  322                 ip6stat.ip6s_badvers++;
  323                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
  324                 goto bad;
  325         }
  326 
  327         /*
  328          * Run through list of hooks for input packets.
  329          *
  330          * NB: Beware of the destination address changing
  331          *     (e.g. by NAT rewriting). When this happens,
  332          *     tell ip6_forward to do the right thing.
  333          */
  334         if (pfil_has_hooks(&inet6_pfil_hook)) {
  335                 odst = ip6->ip6_dst;
  336                 if (pfil_run_hooks(&inet6_pfil_hook, &m,
  337                     m->m_pkthdr.rcvif, PFIL_IN)) {
  338                         goto bad2;
  339                 }
  340                 if (m == NULL)                  /* consumed by filter */
  341                         goto bad2;
  342                 ip6 = mtod(m, struct ip6_hdr *);
  343                 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
  344         }
  345 
  346         ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
  347 
  348 #ifdef ALTQ
  349         if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
  350                 /* packet is dropped by traffic conditioner */
  351                 return;
  352         }
  353 #endif
  354 
  355         /*
  356          * Check with the firewall...
  357          */
  358         if (ip6_fw_enable && ip6_fw_chk_ptr) {
  359                 u_short port = 0;
  360                 /* If ipfw says divert, we have to just drop packet */
  361                 /* use port as a dummy argument */
  362                 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
  363                         m_freem(m);
  364                         m = NULL;
  365                 }
  366                 if (!m)
  367                         goto bad2;
  368         }
  369 
  370         /*
  371          * Check against address spoofing/corruption.
  372          */
  373         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
  374             IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
  375                 /*
  376                  * XXX: "badscope" is not very suitable for a multicast source.
  377                  */
  378                 ip6stat.ip6s_badscope++;
  379                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
  380                 goto bad;
  381         }
  382         if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
  383              IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
  384             (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
  385                 ip6stat.ip6s_badscope++;
  386                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
  387                 goto bad;
  388         }
  389 
  390         /*
  391          * The following check is not documented in specs.  A malicious
  392          * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
  393          * and bypass security checks (act as if it was from 127.0.0.1 by using
  394          * IPv6 src ::ffff:127.0.0.1).  Be cautious.
  395          *
  396          * This check chokes if we are in an SIIT cloud.  As none of BSDs
  397          * support IPv4-less kernel compilation, we cannot support SIIT
  398          * environment at all.  So, it makes more sense for us to reject any
  399          * malicious packets for non-SIIT environment, than try to do a
  400          * partical support for SIIT environment.
  401          */
  402         if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
  403             IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
  404                 ip6stat.ip6s_badscope++;
  405                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
  406                 goto bad;
  407         }
  408 #if 0
  409         /*
  410          * Reject packets with IPv4 compatible addresses (auto tunnel).
  411          *
  412          * The code forbids auto tunnel relay case in RFC1933 (the check is
  413          * stronger than RFC1933).  We may want to re-enable it if mech-xx
  414          * is revised to forbid relaying case.
  415          */
  416         if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
  417             IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
  418                 ip6stat.ip6s_badscope++;
  419                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
  420                 goto bad;
  421         }
  422 #endif
  423 
  424         /* drop packets if interface ID portion is already filled */
  425         if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
  426                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
  427                     ip6->ip6_src.s6_addr16[1]) {
  428                         ip6stat.ip6s_badscope++;
  429                         goto bad;
  430                 }
  431                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
  432                     ip6->ip6_dst.s6_addr16[1]) {
  433                         ip6stat.ip6s_badscope++;
  434                         goto bad;
  435                 }
  436         }
  437 
  438         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
  439                 ip6->ip6_src.s6_addr16[1]
  440                         = htons(m->m_pkthdr.rcvif->if_index);
  441         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
  442                 ip6->ip6_dst.s6_addr16[1]
  443                         = htons(m->m_pkthdr.rcvif->if_index);
  444 
  445 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
  446         /*
  447          * We use rt->rt_ifp to determine if the address is ours or not.
  448          * If rt_ifp is lo0, the address is ours.
  449          * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
  450          * so any address under fe80::%lo0/64 will be mistakenly considered
  451          * local.  The special case is supplied to handle the case properly
  452          * by actually looking at interface addresses
  453          * (using in6ifa_ifpwithaddr).
  454          */
  455         if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) &&
  456             IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
  457                 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
  458                         icmp6_error(m, ICMP6_DST_UNREACH,
  459                             ICMP6_DST_UNREACH_ADDR, 0);
  460                         /* m is already freed */
  461                         goto bad2;
  462                 }
  463 
  464                 ours = 1;
  465                 deliverifp = m->m_pkthdr.rcvif;
  466                 goto hbhcheck;
  467         }
  468 #endif
  469 
  470         /*
  471          * Multicast check
  472          *
  473          * WARNING!  For general subnet proxying the interface hw will
  474          *           likely filter out the multicast solicitations, so
  475          *           the interface must be in promiscuous mode.
  476          */
  477         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  478                 ours = 1;
  479                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
  480                 deliverifp = m->m_pkthdr.rcvif;
  481                 goto hbhcheck;
  482         }
  483 
  484         /*
  485          *  Unicast check
  486          */
  487         switch (ip6_ours_check_algorithm) {
  488         default:
  489                 /*
  490                  * XXX: I intentionally broke our indentation rule here,
  491                  *      since this switch-case is just for measurement and
  492                  *      therefore should soon be removed.
  493                  */
  494         if (ip6_forward_rt.ro_rt != NULL &&
  495             (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) &&
  496             IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
  497                                &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
  498                 ip6stat.ip6s_forward_cachehit++;
  499         else {
  500                 struct sockaddr_in6 *dst6;
  501 
  502                 if (ip6_forward_rt.ro_rt) {
  503                         /* route is down or destination is different */
  504                         ip6stat.ip6s_forward_cachemiss++;
  505                         RTFREE(ip6_forward_rt.ro_rt);
  506                         ip6_forward_rt.ro_rt = 0;
  507                 }
  508 
  509                 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
  510                 dst6 = &ip6_forward_rt.ro_dst;
  511                 dst6->sin6_len = sizeof(struct sockaddr_in6);
  512                 dst6->sin6_family = AF_INET6;
  513                 dst6->sin6_addr = ip6->ip6_dst;
  514 
  515                 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
  516         }
  517 
  518 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
  519 
  520         /*
  521          * Accept the packet if the forwarding interface to the destination
  522          * according to the routing table is the loopback interface,
  523          * unless the associated route has a gateway.
  524          * Note that this approach causes to accept a packet if there is a
  525          * route to the loopback interface for the destination of the packet.
  526          * But we think it's even useful in some situations, e.g. when using
  527          * a special daemon which wants to intercept the packet.
  528          *
  529          * XXX: some OSes automatically make a cloned route for the destination
  530          * of an outgoing packet.  If the outgoing interface of the packet
  531          * is a loopback one, the kernel would consider the packet to be
  532          * accepted, even if we have no such address assinged on the interface.
  533          * We check the cloned flag of the route entry to reject such cases,
  534          * assuming that route entries for our own addresses are not made by
  535          * cloning (it should be true because in6_addloop explicitly installs
  536          * the host route).  However, we might have to do an explicit check
  537          * while it would be less efficient.  Or, should we rather install a
  538          * reject route for such a case?
  539          */
  540         if (ip6_forward_rt.ro_rt &&
  541             (ip6_forward_rt.ro_rt->rt_flags &
  542              (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
  543 #ifdef RTF_WASCLONED
  544             !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
  545 #endif
  546 #ifdef RTF_CLONED
  547             !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
  548 #endif
  549 #if 0
  550             /*
  551              * The check below is redundant since the comparison of
  552              * the destination and the key of the rtentry has
  553              * already done through looking up the routing table.
  554              */
  555             IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
  556                                 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
  557 #endif
  558             ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
  559                 struct in6_ifaddr *ia6 =
  560                         (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
  561 
  562                 /*
  563                  * record address information into m_aux.
  564                  */
  565                 ip6_setdstifaddr(m, ia6);
  566 
  567                 /*
  568                  * packets to a tentative, duplicated, or somehow invalid
  569                  * address must not be accepted.
  570                  */
  571                 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
  572                         /* this address is ready */
  573                         ours = 1;
  574                         deliverifp = ia6->ia_ifp;       /* correct? */
  575                         /* Count the packet in the ip address stats */
  576                         IFA_STAT_INC(&ia6->ia_ifa, ipackets, 1);
  577                         IFA_STAT_INC(&ia6->ia_ifa, ibytes, m->m_pkthdr.len);
  578                         goto hbhcheck;
  579                 } else {
  580                         /* address is not ready, so discard the packet. */
  581                         nd6log((LOG_INFO,
  582                             "ip6_input: packet to an unready address %s->%s\n",
  583                             ip6_sprintf(&ip6->ip6_src),
  584                             ip6_sprintf(&ip6->ip6_dst)));
  585 
  586                         goto bad;
  587                 }
  588         }
  589         } /* XXX indentation (see above) */
  590 
  591         /*
  592          * FAITH(Firewall Aided Internet Translator)
  593          */
  594         if (ip6_keepfaith) {
  595                 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
  596                  && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
  597                         /* XXX do we need more sanity checks? */
  598                         ours = 1;
  599                         deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
  600                         goto hbhcheck;
  601                 }
  602         }
  603 
  604         /*
  605          * Now there is no reason to process the packet if it's not our own
  606          * and we're not a router.
  607          */
  608         if (!ip6_forwarding) {
  609                 ip6stat.ip6s_cantforward++;
  610                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
  611                 goto bad;
  612         }
  613 
  614 hbhcheck:
  615         /*
  616          * record address information into m_aux, if we don't have one yet.
  617          * note that we are unable to record it, if the address is not listed
  618          * as our interface address (e.g. multicast addresses, addresses
  619          * within FAITH prefixes and such).
  620          */
  621         if (deliverifp && !ip6_getdstifaddr(m)) {
  622                 struct in6_ifaddr *ia6;
  623 
  624                 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
  625                 if (ia6) {
  626                         if (!ip6_setdstifaddr(m, ia6)) {
  627                                 /*
  628                                  * XXX maybe we should drop the packet here,
  629                                  * as we could not provide enough information
  630                                  * to the upper layers.
  631                                  */
  632                         }
  633                 }
  634         }
  635 
  636         /*
  637          * Process Hop-by-Hop options header if it's contained.
  638          * m may be modified in ip6_hopopts_input().
  639          * If a JumboPayload option is included, plen will also be modified.
  640          */
  641         plen = (u_int32_t)ntohs(ip6->ip6_plen);
  642         if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
  643                 struct ip6_hbh *hbh;
  644 
  645                 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
  646 #if 0   /*touches NULL pointer*/
  647                         in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
  648 #endif
  649                         goto bad2;      /* m have already been freed */
  650                 }
  651 
  652                 /* adjust pointer */
  653                 ip6 = mtod(m, struct ip6_hdr *);
  654 
  655                 /*
  656                  * if the payload length field is 0 and the next header field
  657                  * indicates Hop-by-Hop Options header, then a Jumbo Payload
  658                  * option MUST be included.
  659                  */
  660                 if (ip6->ip6_plen == 0 && plen == 0) {
  661                         /*
  662                          * Note that if a valid jumbo payload option is
  663                          * contained, ip6_hoptops_input() must set a valid
  664                          * (non-zero) payload length to the variable plen.
  665                          */
  666                         ip6stat.ip6s_badoptions++;
  667                         in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
  668                         in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
  669                         icmp6_error(m, ICMP6_PARAM_PROB,
  670                                     ICMP6_PARAMPROB_HEADER,
  671                                     (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
  672                         goto bad2;
  673                 }
  674 #ifndef PULLDOWN_TEST
  675                 /* ip6_hopopts_input() ensures that mbuf is contiguous */
  676                 hbh = (struct ip6_hbh *)(ip6 + 1);
  677 #else
  678                 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
  679                         sizeof(struct ip6_hbh));
  680                 if (hbh == NULL) {
  681                         ip6stat.ip6s_tooshort++;
  682                         goto bad2;
  683                 }
  684 #endif
  685                 nxt = hbh->ip6h_nxt;
  686 
  687                 /*
  688                  * If we are acting as a router and the packet contains a
  689                  * router alert option, see if we know the option value.
  690                  * Currently, we only support the option value for MLD, in which
  691                  * case we should pass the packet to the multicast routing
  692                  * daemon.
  693                  */
  694                 if (rtalert != ~0 && ip6_forwarding) {
  695                         switch (rtalert) {
  696                         case IP6OPT_RTALERT_MLD:
  697                                 ours = 1;
  698                                 break;
  699                         default:
  700                                 /*
  701                                  * RFC2711 requires unrecognized values must be
  702                                  * silently ignored.
  703                                  */
  704                                 break;
  705                         }
  706                 }
  707         } else
  708                 nxt = ip6->ip6_nxt;
  709 
  710         /*
  711          * Check that the amount of data in the buffers
  712          * is as at least much as the IPv6 header would have us expect.
  713          * Trim mbufs if longer than we expect.
  714          * Drop packet if shorter than we expect.
  715          */
  716         if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
  717                 ip6stat.ip6s_tooshort++;
  718                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
  719                 goto bad;
  720         }
  721         if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
  722                 if (m->m_len == m->m_pkthdr.len) {
  723                         m->m_len = sizeof(struct ip6_hdr) + plen;
  724                         m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
  725                 } else
  726                         m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
  727         }
  728 
  729         /*
  730          * Forward if desirable.
  731          */
  732         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  733                 /*
  734                  * If we are acting as a multicast router, all
  735                  * incoming multicast packets are passed to the
  736                  * kernel-level multicast forwarding function.
  737                  * The packet is returned (relatively) intact; if
  738                  * ip6_mforward() returns a non-zero value, the packet
  739                  * must be discarded, else it may be accepted below.
  740                  */
  741                 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
  742                         ip6stat.ip6s_cantforward++;
  743                         goto bad;
  744                 }
  745                 if (!ours)
  746                         goto bad;
  747         } else if (!ours) {
  748                 ip6_forward(m, srcrt);
  749                 goto bad2;
  750         }       
  751 
  752         ip6 = mtod(m, struct ip6_hdr *);
  753 
  754         /*
  755          * Malicious party may be able to use IPv4 mapped addr to confuse
  756          * tcp/udp stack and bypass security checks (act as if it was from
  757          * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
  758          *
  759          * For SIIT end node behavior, you may want to disable the check.
  760          * However, you will  become vulnerable to attacks using IPv4 mapped
  761          * source.
  762          */
  763         if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
  764             IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
  765                 ip6stat.ip6s_badscope++;
  766                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
  767                 goto bad;
  768         }
  769 
  770         /*
  771          * Tell launch routine the next header
  772          */
  773         ip6stat.ip6s_delivered++;
  774         in6_ifstat_inc(deliverifp, ifs6_in_deliver);
  775         nest = 0;
  776 
  777         rh_present = 0;
  778         while (nxt != IPPROTO_DONE) {
  779                 struct protosw *sw6;
  780 
  781                 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
  782                         ip6stat.ip6s_toomanyhdr++;
  783                         in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
  784                         goto bad;
  785                 }
  786 
  787                 /*
  788                  * protection against faulty packet - there should be
  789                  * more sanity checks in header chain processing.
  790                  */
  791                 if (m->m_pkthdr.len < off) {
  792                         ip6stat.ip6s_tooshort++;
  793                         in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
  794                         goto bad;
  795                 }
  796 
  797 #if 0
  798                 /*
  799                  * do we need to do it for every header?  yeah, other
  800                  * functions can play with it (like re-allocate and copy).
  801                  */
  802                 mhist = ip6_addaux(m);
  803                 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
  804                         hist = mtod(mhist, caddr_t) + mhist->m_len;
  805                         bcopy(&nxt, hist, sizeof(nxt));
  806                         mhist->m_len += sizeof(nxt);
  807                 } else {
  808                         ip6stat.ip6s_toomanyhdr++;
  809                         goto bad;
  810                 }
  811 #endif
  812 
  813                 if (nxt == IPPROTO_ROUTING) {
  814                         if (rh_present++) {
  815                                 in6_ifstat_inc(m->m_pkthdr.rcvif,
  816                                     ifs6_in_hdrerr);
  817                                 ip6stat.ip6s_badoptions++;
  818                                 goto bad;
  819                         }
  820                 }
  821 
  822                 sw6 = &inet6sw[ip6_protox[nxt]];
  823 #ifdef IPSEC
  824                 /*
  825                  * enforce IPsec policy checking if we are seeing last header.
  826                  * note that we do not visit this with protocols with pcb layer
  827                  * code - like udp/tcp/raw ip.
  828                  */
  829                 if ((sw6->pr_flags & PR_LASTHDR) && ipsec6_in_reject(m, NULL)) {
  830                         ipsec6stat.in_polvio++;
  831                         goto bad;
  832                 }
  833 #endif
  834                 /*
  835                  * If this is a terminal header forward to the port, otherwise
  836                  * process synchronously for more headers.
  837                  */
  838                 if (sw6->pr_flags & PR_LASTHDR) {
  839                         struct netmsg_packet *pmsg;
  840                         lwkt_port_t port;
  841 
  842                         port = netisr_cpuport(0); /* XXX */
  843                         KKASSERT(port != NULL);
  844                         pmsg = &m->m_hdr.mh_netmsg;
  845                         netmsg_init(&pmsg->base, NULL,
  846                                     &netisr_apanic_rport,
  847                                     0, transport6_processing_handler);
  848                         pmsg->nm_packet = m;
  849                         pmsg->nm_nxt = nxt;
  850                         pmsg->base.lmsg.u.ms_result = off;
  851                         lwkt_sendmsg(port, &pmsg->base.lmsg);
  852                         /* done with m */
  853                         nxt = IPPROTO_DONE;
  854                 } else {
  855                         nxt = sw6->pr_input(&m, &off, nxt);
  856                 }
  857         }
  858         goto bad2;
  859 bad:
  860         m_freem(m);
  861 bad2:
  862         ;
  863         /* msg was embedded in the mbuf, do not reply! */
  864 }
  865 
  866 /*
  867  * We have to call the pr_input() function from the correct protocol
  868  * thread.  The sw6->pr_soport() request at the end of ip6_input()
  869  * returns the port and we forward a netmsg to the port to execute
  870  * this function.
  871  */
  872 static void
  873 transport6_processing_handler(netmsg_t netmsg)
  874 {
  875         struct netmsg_packet *pmsg = (struct netmsg_packet *)netmsg;
  876         struct protosw *sw6;
  877         int hlen;
  878         int nxt;
  879 
  880         sw6 = &inet6sw[ip6_protox[pmsg->nm_nxt]];
  881         hlen = pmsg->base.lmsg.u.ms_result;
  882 
  883         nxt = sw6->pr_input(&pmsg->nm_packet, &hlen, pmsg->nm_nxt);
  884         KKASSERT(nxt == IPPROTO_DONE);
  885         /* netmsg was embedded in the mbuf, do not reply! */
  886 }
  887 
  888 /*
  889  * set/grab in6_ifaddr correspond to IPv6 destination address.
  890  * XXX backward compatibility wrapper
  891  */
  892 static struct ip6aux *
  893 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
  894 {
  895         struct ip6aux *n;
  896 
  897         n = ip6_addaux(m);
  898         if (n)
  899                 n->ip6a_dstia6 = ia6;
  900         return n;       /* NULL if failed to set */
  901 }
  902 
  903 struct in6_ifaddr *
  904 ip6_getdstifaddr(struct mbuf *m)
  905 {
  906         struct ip6aux *n;
  907 
  908         n = ip6_findaux(m);
  909         if (n)
  910                 return n->ip6a_dstia6;
  911         else
  912                 return NULL;
  913 }
  914 
  915 /*
  916  * Hop-by-Hop options header processing. If a valid jumbo payload option is
  917  * included, the real payload length will be stored in plenp.
  918  */
  919 static int
  920 ip6_hopopts_input(u_int32_t *plenp,
  921                   u_int32_t *rtalertp,/* XXX: should be stored more smart way */
  922                   struct mbuf **mp,
  923                   int *offp)
  924 {
  925         struct mbuf *m = *mp;
  926         int off = *offp, hbhlen;
  927         struct ip6_hbh *hbh;
  928 
  929         /* validation of the length of the header */
  930 #ifndef PULLDOWN_TEST
  931         IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
  932         hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
  933         hbhlen = (hbh->ip6h_len + 1) << 3;
  934 
  935         IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
  936         hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
  937 #else
  938         IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
  939                 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
  940         if (hbh == NULL) {
  941                 ip6stat.ip6s_tooshort++;
  942                 return -1;
  943         }
  944         hbhlen = (hbh->ip6h_len + 1) << 3;
  945         IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
  946                 hbhlen);
  947         if (hbh == NULL) {
  948                 ip6stat.ip6s_tooshort++;
  949                 return -1;
  950         }
  951 #endif
  952         off += hbhlen;
  953         hbhlen -= sizeof(struct ip6_hbh);
  954 
  955         if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
  956                                 hbhlen, rtalertp, plenp) < 0)
  957                 return (-1);
  958 
  959         *offp = off;
  960         *mp = m;
  961         return (0);
  962 }
  963 
  964 /*
  965  * Search header for all Hop-by-hop options and process each option.
  966  * This function is separate from ip6_hopopts_input() in order to
  967  * handle a case where the sending node itself process its hop-by-hop
  968  * options header. In such a case, the function is called from ip6_output().
  969  *
  970  * The function assumes that hbh header is located right after the IPv6 header
  971  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
  972  * opthead + hbhlen is located in continuous memory region.
  973  */
  974 int
  975 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
  976                     u_int32_t *rtalertp, u_int32_t *plenp)
  977 {
  978         struct ip6_hdr *ip6;
  979         int optlen = 0;
  980         u_int8_t *opt = opthead;
  981         u_int16_t rtalert_val;
  982         u_int32_t jumboplen;
  983         const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
  984 
  985         for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
  986                 switch (*opt) {
  987                 case IP6OPT_PAD1:
  988                         optlen = 1;
  989                         break;
  990                 case IP6OPT_PADN:
  991                         if (hbhlen < IP6OPT_MINLEN) {
  992                                 ip6stat.ip6s_toosmall++;
  993                                 goto bad;
  994                         }
  995                         optlen = *(opt + 1) + 2;
  996                         break;
  997                 case IP6OPT_RTALERT:
  998                         /* XXX may need check for alignment */
  999                         if (hbhlen < IP6OPT_RTALERT_LEN) {
 1000                                 ip6stat.ip6s_toosmall++;
 1001                                 goto bad;
 1002                         }
 1003                         if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
 1004                                 /* XXX stat */
 1005                                 icmp6_error(m, ICMP6_PARAM_PROB,
 1006                                             ICMP6_PARAMPROB_HEADER,
 1007                                             erroff + opt + 1 - opthead);
 1008                                 return (-1);
 1009                         }
 1010                         optlen = IP6OPT_RTALERT_LEN;
 1011                         bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
 1012                         *rtalertp = ntohs(rtalert_val);
 1013                         break;
 1014                 case IP6OPT_JUMBO:
 1015                         /* XXX may need check for alignment */
 1016                         if (hbhlen < IP6OPT_JUMBO_LEN) {
 1017                                 ip6stat.ip6s_toosmall++;
 1018                                 goto bad;
 1019                         }
 1020                         if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
 1021                                 /* XXX stat */
 1022                                 icmp6_error(m, ICMP6_PARAM_PROB,
 1023                                             ICMP6_PARAMPROB_HEADER,
 1024                                             erroff + opt + 1 - opthead);
 1025                                 return (-1);
 1026                         }
 1027                         optlen = IP6OPT_JUMBO_LEN;
 1028 
 1029                         /*
 1030                          * IPv6 packets that have non 0 payload length
 1031                          * must not contain a jumbo payload option.
 1032                          */
 1033                         ip6 = mtod(m, struct ip6_hdr *);
 1034                         if (ip6->ip6_plen) {
 1035                                 ip6stat.ip6s_badoptions++;
 1036                                 icmp6_error(m, ICMP6_PARAM_PROB,
 1037                                             ICMP6_PARAMPROB_HEADER,
 1038                                             erroff + opt - opthead);
 1039                                 return (-1);
 1040                         }
 1041 
 1042                         /*
 1043                          * We may see jumbolen in unaligned location, so
 1044                          * we'd need to perform bcopy().
 1045                          */
 1046                         bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
 1047                         jumboplen = (u_int32_t)htonl(jumboplen);
 1048 
 1049 #if 1
 1050                         /*
 1051                          * if there are multiple jumbo payload options,
 1052                          * *plenp will be non-zero and the packet will be
 1053                          * rejected.
 1054                          * the behavior may need some debate in ipngwg -
 1055                          * multiple options does not make sense, however,
 1056                          * there's no explicit mention in specification.
 1057                          */
 1058                         if (*plenp != 0) {
 1059                                 ip6stat.ip6s_badoptions++;
 1060                                 icmp6_error(m, ICMP6_PARAM_PROB,
 1061                                             ICMP6_PARAMPROB_HEADER,
 1062                                             erroff + opt + 2 - opthead);
 1063                                 return (-1);
 1064                         }
 1065 #endif
 1066 
 1067                         /*
 1068                          * jumbo payload length must be larger than 65535.
 1069                          */
 1070                         if (jumboplen <= IPV6_MAXPACKET) {
 1071                                 ip6stat.ip6s_badoptions++;
 1072                                 icmp6_error(m, ICMP6_PARAM_PROB,
 1073                                             ICMP6_PARAMPROB_HEADER,
 1074                                             erroff + opt + 2 - opthead);
 1075                                 return (-1);
 1076                         }
 1077                         *plenp = jumboplen;
 1078 
 1079                         break;
 1080                 default:                /* unknown option */
 1081                         if (hbhlen < IP6OPT_MINLEN) {
 1082                                 ip6stat.ip6s_toosmall++;
 1083                                 goto bad;
 1084                         }
 1085                         optlen = ip6_unknown_opt(opt, m,
 1086                             erroff + opt - opthead);
 1087                         if (optlen == -1)
 1088                                 return (-1);
 1089                         optlen += 2;
 1090                         break;
 1091                 }
 1092         }
 1093 
 1094         return (0);
 1095 
 1096 bad:
 1097         m_freem(m);
 1098         return (-1);
 1099 }
 1100 
 1101 /*
 1102  * Unknown option processing.
 1103  * The third argument `off' is the offset from the IPv6 header to the option,
 1104  * which is necessary if the IPv6 header the and option header and IPv6 header
 1105  * is not continuous in order to return an ICMPv6 error.
 1106  */
 1107 int
 1108 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
 1109 {
 1110         struct ip6_hdr *ip6;
 1111 
 1112         switch (IP6OPT_TYPE(*optp)) {
 1113         case IP6OPT_TYPE_SKIP: /* ignore the option */
 1114                 return ((int)*(optp + 1));
 1115         case IP6OPT_TYPE_DISCARD:       /* silently discard */
 1116                 m_freem(m);
 1117                 return (-1);
 1118         case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
 1119                 ip6stat.ip6s_badoptions++;
 1120                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
 1121                 return (-1);
 1122         case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
 1123                 ip6stat.ip6s_badoptions++;
 1124                 ip6 = mtod(m, struct ip6_hdr *);
 1125                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
 1126                     (m->m_flags & (M_BCAST|M_MCAST)))
 1127                         m_freem(m);
 1128                 else
 1129                         icmp6_error(m, ICMP6_PARAM_PROB,
 1130                                     ICMP6_PARAMPROB_OPTION, off);
 1131                 return (-1);
 1132         }
 1133 
 1134         m_freem(m);             /* XXX: NOTREACHED */
 1135         return (-1);
 1136 }
 1137 
 1138 /*
 1139  * Create the "control" list for this pcb.
 1140  * The function will not modify mbuf chain at all.
 1141  *
 1142  * with KAME mbuf chain restriction:
 1143  * The routine will be called from upper layer handlers like tcp6_input().
 1144  * Thus the routine assumes that the caller (tcp6_input) have already
 1145  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
 1146  * very first mbuf on the mbuf chain.
 1147  */
 1148 void
 1149 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
 1150                 struct mbuf *m)
 1151 {
 1152         #define IS2292(x, y)    ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
 1153         struct thread *td = curthread;  /* XXX */
 1154         int privileged = 0;
 1155 
 1156 
 1157         if (priv_check(td, PRIV_ROOT) == 0)
 1158                 privileged++;
 1159 
 1160 #ifdef SO_TIMESTAMP
 1161         if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
 1162                 struct timeval tv;
 1163 
 1164                 microtime(&tv);
 1165                 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
 1166                                       SCM_TIMESTAMP, SOL_SOCKET);
 1167                 if (*mp) {
 1168                         mp = &(*mp)->m_next;
 1169                 }
 1170         }
 1171 #endif
 1172 
 1173         /* RFC 2292 sec. 5 */
 1174         if (in6p->in6p_flags & IN6P_PKTINFO) {
 1175                 struct in6_pktinfo pi6;
 1176                 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
 1177                 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
 1178                         pi6.ipi6_addr.s6_addr16[1] = 0;
 1179                 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
 1180                                         ? m->m_pkthdr.rcvif->if_index
 1181                                         : 0;
 1182                 *mp = sbcreatecontrol((caddr_t) &pi6,
 1183                         sizeof(struct in6_pktinfo), IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO),
 1184                         IPPROTO_IPV6);
 1185                 if (*mp)
 1186                         mp = &(*mp)->m_next;
 1187         }
 1188 
 1189         if (in6p->in6p_flags & IN6P_HOPLIMIT) {
 1190                 int hlim = ip6->ip6_hlim & 0xff;
 1191                 *mp = sbcreatecontrol((caddr_t) &hlim,
 1192                         sizeof(int), IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
 1193                 if (*mp)
 1194                         mp = &(*mp)->m_next;
 1195         }
 1196 
 1197         if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
 1198                 u_int32_t flowinfo;
 1199                 int tclass;
 1200 
 1201                 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
 1202                 flowinfo >>= 20;
 1203 
 1204                 tclass = flowinfo & 0xff;
 1205                 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(tclass),
 1206                     IPV6_TCLASS, IPPROTO_IPV6);
 1207                 if (*mp)
 1208                         mp = &(*mp)->m_next;
 1209         }
 1210 
 1211         /*
 1212          * IPV6_HOPOPTS socket option. We require super-user privilege
 1213          * for the option, but it might be too strict, since there might
 1214          * be some hop-by-hop options which can be returned to normal user.
 1215          * See RFC 2292 section 6.
 1216          */
 1217         if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
 1218                 /*
 1219                  * Check if a hop-by-hop options header is contatined in the
 1220                  * received packet, and if so, store the options as ancillary
 1221                  * data. Note that a hop-by-hop options header must be
 1222                  * just after the IPv6 header, which fact is assured through
 1223                  * the IPv6 input processing.
 1224                  */
 1225                 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1226                 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
 1227                         struct ip6_hbh *hbh;
 1228                         int hbhlen = 0;
 1229 #ifdef PULLDOWN_TEST
 1230                         struct mbuf *ext;
 1231 #endif
 1232 
 1233 #ifndef PULLDOWN_TEST
 1234                         hbh = (struct ip6_hbh *)(ip6 + 1);
 1235                         hbhlen = (hbh->ip6h_len + 1) << 3;
 1236 #else
 1237                         ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
 1238                             ip6->ip6_nxt);
 1239                         if (ext == NULL) {
 1240                                 ip6stat.ip6s_tooshort++;
 1241                                 return;
 1242                         }
 1243                         hbh = mtod(ext, struct ip6_hbh *);
 1244                         hbhlen = (hbh->ip6h_len + 1) << 3;
 1245                         if (hbhlen != ext->m_len) {
 1246                                 m_freem(ext);
 1247                                 ip6stat.ip6s_tooshort++;
 1248                                 return;
 1249                         }
 1250 #endif
 1251 
 1252                         /*
 1253                          * XXX: We copy whole the header even if a jumbo
 1254                          * payload option is included, which option is to
 1255                          * be removed before returning in the RFC 2292.
 1256                          * Note: this constraint is removed in 2292bis.
 1257                          */
 1258                         *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
 1259                                  IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), IPPROTO_IPV6);
 1260                         if (*mp)
 1261                                 mp = &(*mp)->m_next;
 1262 #ifdef PULLDOWN_TEST
 1263                         m_freem(ext);
 1264 #endif
 1265                 }
 1266         }
 1267 
 1268         /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
 1269         if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
 1270                 int proto, off, nxt;
 1271 
 1272                 /*
 1273                  * go through the header chain to see if a routing header is
 1274                  * contained in the packet. We need this information to store
 1275                  * destination options headers (if any) properly.
 1276                  * XXX: performance issue. We should record this info when
 1277                  * processing extension headers in incoming routine.
 1278                  * (todo) use m_aux?
 1279                  */
 1280                 proto = IPPROTO_IPV6;
 1281                 off = 0;
 1282                 nxt = -1;
 1283                 while (1) {
 1284                         int newoff;
 1285 
 1286                         newoff = ip6_nexthdr(m, off, proto, &nxt);
 1287                         if (newoff < 0)
 1288                                 break;
 1289                         if (newoff < off) /* invalid, check for safety */
 1290                                 break;
 1291                         if ((proto = nxt) == IPPROTO_ROUTING)
 1292                                 break;
 1293                         off = newoff;
 1294                 }
 1295         }
 1296 
 1297         if ((in6p->in6p_flags &
 1298              (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
 1299                 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1300                 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
 1301 
 1302                 /*
 1303                  * Search for destination options headers or routing
 1304                  * header(s) through the header chain, and stores each
 1305                  * header as ancillary data.
 1306                  * Note that the order of the headers remains in
 1307                  * the chain of ancillary data.
 1308                  */
 1309                 while (1) {     /* is explicit loop prevention necessary? */
 1310                         struct ip6_ext *ip6e = NULL;
 1311                         int elen;
 1312 #ifdef PULLDOWN_TEST
 1313                         struct mbuf *ext = NULL;
 1314 #endif
 1315 
 1316                         /*
 1317                          * if it is not an extension header, don't try to
 1318                          * pull it from the chain.
 1319                          */
 1320                         switch (nxt) {
 1321                         case IPPROTO_DSTOPTS:
 1322                         case IPPROTO_ROUTING:
 1323                         case IPPROTO_HOPOPTS:
 1324                         case IPPROTO_AH: /* is it possible? */
 1325                                 break;
 1326                         default:
 1327                                 goto loopend;
 1328                         }
 1329 
 1330 #ifndef PULLDOWN_TEST
 1331                         if (off + sizeof(*ip6e) > m->m_len)
 1332                                 goto loopend;
 1333                         ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
 1334                         if (nxt == IPPROTO_AH)
 1335                                 elen = (ip6e->ip6e_len + 2) << 2;
 1336                         else
 1337                                 elen = (ip6e->ip6e_len + 1) << 3;
 1338                         if (off + elen > m->m_len)
 1339                                 goto loopend;
 1340 #else
 1341                         ext = ip6_pullexthdr(m, off, nxt);
 1342                         if (ext == NULL) {
 1343                                 ip6stat.ip6s_tooshort++;
 1344                                 return;
 1345                         }
 1346                         ip6e = mtod(ext, struct ip6_ext *);
 1347                         if (nxt == IPPROTO_AH)
 1348                                 elen = (ip6e->ip6e_len + 2) << 2;
 1349                         else
 1350                                 elen = (ip6e->ip6e_len + 1) << 3;
 1351                         if (elen != ext->m_len) {
 1352                                 m_freem(ext);
 1353                                 ip6stat.ip6s_tooshort++;
 1354                                 return;
 1355                         }
 1356 #endif
 1357 
 1358                         switch (nxt) {
 1359                         case IPPROTO_DSTOPTS:
 1360                                 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
 1361                                         break;
 1362 
 1363                                 /*
 1364                                  * We also require super-user privilege for
 1365                                  * the option.
 1366                                  * See the comments on IN6_HOPOPTS.
 1367                                  */
 1368                                 if (!privileged)
 1369                                         break;
 1370 
 1371                                 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
 1372                                                       IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
 1373                                                       IPPROTO_IPV6);
 1374                                 if (*mp)
 1375                                         mp = &(*mp)->m_next;
 1376                                 break;
 1377                         case IPPROTO_ROUTING:
 1378                                 if (!(in6p->in6p_flags & IN6P_RTHDR))
 1379                                         break;
 1380 
 1381                                 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
 1382                                                       IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
 1383                                                       IPPROTO_IPV6);
 1384                                 if (*mp)
 1385                                         mp = &(*mp)->m_next;
 1386                                 break;
 1387                         case IPPROTO_HOPOPTS:
 1388                         case IPPROTO_AH: /* is it possible? */
 1389                                 break;
 1390 
 1391                         default:
 1392                                 /*
 1393                                  * other cases have been filtered in the above.
 1394                                  * none will visit this case.  here we supply
 1395                                  * the code just in case (nxt overwritten or
 1396                                  * other cases).
 1397                                  */
 1398 #ifdef PULLDOWN_TEST
 1399                                 m_freem(ext);
 1400 #endif
 1401                                 goto loopend;
 1402 
 1403                         }
 1404 
 1405                         /* proceed with the next header. */
 1406                         off += elen;
 1407                         nxt = ip6e->ip6e_nxt;
 1408                         ip6e = NULL;
 1409 #ifdef PULLDOWN_TEST
 1410                         m_freem(ext);
 1411                         ext = NULL;
 1412 #endif
 1413                 }
 1414           loopend:
 1415                 ;
 1416         }
 1417 #undef IS2292
 1418 }
 1419 
 1420 void
 1421 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
 1422 {
 1423         struct socket *so;
 1424         struct mbuf *m_mtu;
 1425         struct ip6_mtuinfo mtuctl;
 1426 
 1427         so =  in6p->inp_socket;
 1428 
 1429         if (mtu == NULL)
 1430                 return;
 1431 
 1432 #ifdef DIAGNOSTIC
 1433         if (so == NULL)         /* I believe this is impossible */
 1434                 panic("ip6_notify_pmtu: socket is NULL");
 1435 #endif
 1436 
 1437         bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
 1438         mtuctl.ip6m_mtu = *mtu;
 1439         mtuctl.ip6m_addr = *dst;
 1440 
 1441         if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
 1442             IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
 1443                 return;
 1444 
 1445         lwkt_gettoken(&so->so_rcv.ssb_token);
 1446         if (sbappendaddr(&so->so_rcv.sb, (struct sockaddr *)dst, NULL, m_mtu)
 1447             == 0) {
 1448                 m_freem(m_mtu);
 1449                 /* XXX: should count statistics */
 1450         } else {
 1451                 sorwakeup(so);
 1452         }
 1453         lwkt_reltoken(&so->so_rcv.ssb_token);
 1454 }
 1455 
 1456 #ifdef PULLDOWN_TEST
 1457 /*
 1458  * pull single extension header from mbuf chain.  returns single mbuf that
 1459  * contains the result, or NULL on error.
 1460  */
 1461 static struct mbuf *
 1462 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
 1463 {
 1464         struct ip6_ext ip6e;
 1465         size_t elen;
 1466         struct mbuf *n;
 1467 
 1468 #ifdef DIAGNOSTIC
 1469         switch (nxt) {
 1470         case IPPROTO_DSTOPTS:
 1471         case IPPROTO_ROUTING:
 1472         case IPPROTO_HOPOPTS:
 1473         case IPPROTO_AH: /* is it possible? */
 1474                 break;
 1475         default:
 1476                 kprintf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
 1477         }
 1478 #endif
 1479 
 1480         m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
 1481         if (nxt == IPPROTO_AH)
 1482                 elen = (ip6e.ip6e_len + 2) << 2;
 1483         else
 1484                 elen = (ip6e.ip6e_len + 1) << 3;
 1485 
 1486         n = m_getb(elen, MB_DONTWAIT, MT_DATA, 0);
 1487         if (n == NULL)
 1488                 return NULL;
 1489         n->m_len = 0;
 1490 
 1491         if (elen >= M_TRAILINGSPACE(n)) {
 1492                 m_free(n);
 1493                 return NULL;
 1494         }
 1495 
 1496         m_copydata(m, off, elen, mtod(n, caddr_t));
 1497         n->m_len = elen;
 1498         return n;
 1499 }
 1500 #endif
 1501 
 1502 /*
 1503  * Get pointer to the previous header followed by the header
 1504  * currently processed.
 1505  * XXX: This function supposes that
 1506  *      M includes all headers,
 1507  *      the next header field and the header length field of each header
 1508  *      are valid, and
 1509  *      the sum of each header length equals to OFF.
 1510  * Because of these assumptions, this function must be called very
 1511  * carefully. Moreover, it will not be used in the near future when
 1512  * we develop `neater' mechanism to process extension headers.
 1513  */
 1514 char *
 1515 ip6_get_prevhdr(struct mbuf *m, int off)
 1516 {
 1517         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 1518 
 1519         if (off == sizeof(struct ip6_hdr))
 1520                 return (&ip6->ip6_nxt);
 1521         else {
 1522                 int len, nxt;
 1523                 struct ip6_ext *ip6e = NULL;
 1524 
 1525                 nxt = ip6->ip6_nxt;
 1526                 len = sizeof(struct ip6_hdr);
 1527                 while (len < off) {
 1528                         ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
 1529 
 1530                         switch (nxt) {
 1531                         case IPPROTO_FRAGMENT:
 1532                                 len += sizeof(struct ip6_frag);
 1533                                 break;
 1534                         case IPPROTO_AH:
 1535                                 len += (ip6e->ip6e_len + 2) << 2;
 1536                                 break;
 1537                         default:
 1538                                 len += (ip6e->ip6e_len + 1) << 3;
 1539                                 break;
 1540                         }
 1541                         nxt = ip6e->ip6e_nxt;
 1542                 }
 1543                 if (ip6e)
 1544                         return (&ip6e->ip6e_nxt);
 1545                 else
 1546                         return NULL;
 1547         }
 1548 }
 1549 
 1550 /*
 1551  * get next header offset.  m will be retained.
 1552  */
 1553 int
 1554 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
 1555 {
 1556         struct ip6_hdr ip6;
 1557         struct ip6_ext ip6e;
 1558         struct ip6_frag fh;
 1559 
 1560         /* just in case */
 1561         if (m == NULL)
 1562                 panic("ip6_nexthdr: m == NULL");
 1563         if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
 1564                 return -1;
 1565 
 1566         switch (proto) {
 1567         case IPPROTO_IPV6:
 1568                 if (m->m_pkthdr.len < off + sizeof(ip6))
 1569                         return -1;
 1570                 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
 1571                 if (nxtp)
 1572                         *nxtp = ip6.ip6_nxt;
 1573                 off += sizeof(ip6);
 1574                 return off;
 1575 
 1576         case IPPROTO_FRAGMENT:
 1577                 /*
 1578                  * terminate parsing if it is not the first fragment,
 1579                  * it does not make sense to parse through it.
 1580                  */
 1581                 if (m->m_pkthdr.len < off + sizeof(fh))
 1582                         return -1;
 1583                 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
 1584                 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
 1585                 if (fh.ip6f_offlg & IP6F_OFF_MASK)
 1586                         return -1;
 1587                 if (nxtp)
 1588                         *nxtp = fh.ip6f_nxt;
 1589                 off += sizeof(struct ip6_frag);
 1590                 return off;
 1591 
 1592         case IPPROTO_AH:
 1593                 if (m->m_pkthdr.len < off + sizeof(ip6e))
 1594                         return -1;
 1595                 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
 1596                 if (nxtp)
 1597                         *nxtp = ip6e.ip6e_nxt;
 1598                 off += (ip6e.ip6e_len + 2) << 2;
 1599                 return off;
 1600 
 1601         case IPPROTO_HOPOPTS:
 1602         case IPPROTO_ROUTING:
 1603         case IPPROTO_DSTOPTS:
 1604                 if (m->m_pkthdr.len < off + sizeof(ip6e))
 1605                         return -1;
 1606                 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
 1607                 if (nxtp)
 1608                         *nxtp = ip6e.ip6e_nxt;
 1609                 off += (ip6e.ip6e_len + 1) << 3;
 1610                 return off;
 1611 
 1612         case IPPROTO_NONE:
 1613         case IPPROTO_ESP:
 1614         case IPPROTO_IPCOMP:
 1615                 /* give up */
 1616                 return -1;
 1617 
 1618         default:
 1619                 return -1;
 1620         }
 1621 
 1622         return -1;
 1623 }
 1624 
 1625 /*
 1626  * get offset for the last header in the chain.  m will be kept untainted.
 1627  */
 1628 int
 1629 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
 1630 {
 1631         int newoff;
 1632         int nxt;
 1633 
 1634         if (!nxtp) {
 1635                 nxt = -1;
 1636                 nxtp = &nxt;
 1637         }
 1638         while (1) {
 1639                 newoff = ip6_nexthdr(m, off, proto, nxtp);
 1640                 if (newoff < 0)
 1641                         return off;
 1642                 else if (newoff < off)
 1643                         return -1;      /* invalid */
 1644                 else if (newoff == off)
 1645                         return newoff;
 1646 
 1647                 off = newoff;
 1648                 proto = *nxtp;
 1649         }
 1650 }
 1651 
 1652 struct ip6aux *
 1653 ip6_addaux(struct mbuf *m)
 1654 {
 1655         struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
 1656         if (!tag) {
 1657                 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
 1658                                 sizeof (struct ip6aux),
 1659                                 MB_DONTWAIT);
 1660                 if (tag)
 1661                         m_tag_prepend(m, tag);
 1662         }
 1663         if (tag)
 1664                 bzero(m_tag_data(tag), sizeof (struct ip6aux));
 1665         return tag ? (struct ip6aux *)m_tag_data(tag) : NULL;
 1666 }
 1667 
 1668 struct ip6aux *
 1669 ip6_findaux(struct mbuf *m)
 1670 {
 1671         struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
 1672         return tag ? (struct ip6aux*)(tag+1) : NULL;
 1673 }
 1674 
 1675 void
 1676 ip6_delaux(struct mbuf *m)
 1677 {
 1678         struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
 1679         if (tag)
 1680                 m_tag_delete(m, tag);
 1681 }
 1682 
 1683 /*
 1684  * System control for IP6
 1685  */
 1686 
 1687 u_char  inet6ctlerrmap[PRC_NCMDS] = {
 1688         0,              0,              0,              0,
 1689         0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
 1690         EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
 1691         EMSGSIZE,       EHOSTUNREACH,   0,              0,
 1692         0,              0,              0,              0,
 1693         ENOPROTOOPT
 1694 };

Cache object: 689d03eaafbaffd3856567ea977b4ebb


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