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


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ip6_output.c

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $
   30  */
   31 
   32 /*-
   33  * Copyright (c) 1982, 1986, 1988, 1990, 1993
   34  *      The Regents of the University of California.  All rights reserved.
   35  *
   36  * Redistribution and use in source and binary forms, with or without
   37  * modification, are permitted provided that the following conditions
   38  * are met:
   39  * 1. Redistributions of source code must retain the above copyright
   40  *    notice, this list of conditions and the following disclaimer.
   41  * 2. Redistributions in binary form must reproduce the above copyright
   42  *    notice, this list of conditions and the following disclaimer in the
   43  *    documentation and/or other materials provided with the distribution.
   44  * 4. Neither the name of the University nor the names of its contributors
   45  *    may be used to endorse or promote products derived from this software
   46  *    without specific prior written permission.
   47  *
   48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   58  * SUCH DAMAGE.
   59  *
   60  *      @(#)ip_output.c 8.3 (Berkeley) 1/21/94
   61  */
   62 
   63 #include <sys/cdefs.h>
   64 __FBSDID("$FreeBSD: releng/10.1/sys/netinet6/ip6_output.c 293894 2016-01-14 09:11:16Z glebius $");
   65 
   66 #include "opt_inet.h"
   67 #include "opt_inet6.h"
   68 #include "opt_ipfw.h"
   69 #include "opt_ipsec.h"
   70 #include "opt_sctp.h"
   71 #include "opt_route.h"
   72 
   73 #include <sys/param.h>
   74 #include <sys/kernel.h>
   75 #include <sys/malloc.h>
   76 #include <sys/mbuf.h>
   77 #include <sys/errno.h>
   78 #include <sys/priv.h>
   79 #include <sys/proc.h>
   80 #include <sys/protosw.h>
   81 #include <sys/socket.h>
   82 #include <sys/socketvar.h>
   83 #include <sys/syslog.h>
   84 #include <sys/ucred.h>
   85 
   86 #include <machine/in_cksum.h>
   87 
   88 #include <net/if.h>
   89 #include <net/netisr.h>
   90 #include <net/route.h>
   91 #include <net/pfil.h>
   92 #include <net/vnet.h>
   93 
   94 #include <netinet/in.h>
   95 #include <netinet/in_var.h>
   96 #include <netinet/ip_var.h>
   97 #include <netinet6/in6_var.h>
   98 #include <netinet/ip6.h>
   99 #include <netinet/icmp6.h>
  100 #include <netinet6/ip6_var.h>
  101 #include <netinet/in_pcb.h>
  102 #include <netinet/tcp_var.h>
  103 #include <netinet6/nd6.h>
  104 
  105 #ifdef IPSEC
  106 #include <netipsec/ipsec.h>
  107 #include <netipsec/ipsec6.h>
  108 #include <netipsec/key.h>
  109 #include <netinet6/ip6_ipsec.h>
  110 #endif /* IPSEC */
  111 #ifdef SCTP
  112 #include <netinet/sctp.h>
  113 #include <netinet/sctp_crc32.h>
  114 #endif
  115 
  116 #include <netinet6/ip6protosw.h>
  117 #include <netinet6/scope6_var.h>
  118 
  119 #ifdef FLOWTABLE
  120 #include <net/flowtable.h>
  121 #endif
  122 
  123 extern int in6_mcast_loop;
  124 
  125 struct ip6_exthdrs {
  126         struct mbuf *ip6e_ip6;
  127         struct mbuf *ip6e_hbh;
  128         struct mbuf *ip6e_dest1;
  129         struct mbuf *ip6e_rthdr;
  130         struct mbuf *ip6e_dest2;
  131 };
  132 
  133 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
  134                            struct ucred *, int);
  135 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
  136         struct socket *, struct sockopt *);
  137 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *);
  138 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
  139         struct ucred *, int, int, int);
  140 
  141 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
  142 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
  143         struct ip6_frag **);
  144 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
  145 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
  146 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *,
  147         struct ifnet *, struct in6_addr *, u_long *, int *, u_int);
  148 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
  149 
  150 
  151 /*
  152  * Make an extension header from option data.  hp is the source, and
  153  * mp is the destination.
  154  */
  155 #define MAKE_EXTHDR(hp, mp)                                             \
  156     do {                                                                \
  157         if (hp) {                                                       \
  158                 struct ip6_ext *eh = (struct ip6_ext *)(hp);            \
  159                 error = ip6_copyexthdr((mp), (caddr_t)(hp),             \
  160                     ((eh)->ip6e_len + 1) << 3);                         \
  161                 if (error)                                              \
  162                         goto freehdrs;                                  \
  163         }                                                               \
  164     } while (/*CONSTCOND*/ 0)
  165 
  166 /*
  167  * Form a chain of extension headers.
  168  * m is the extension header mbuf
  169  * mp is the previous mbuf in the chain
  170  * p is the next header
  171  * i is the type of option.
  172  */
  173 #define MAKE_CHAIN(m, mp, p, i)\
  174     do {\
  175         if (m) {\
  176                 if (!hdrsplit) \
  177                         panic("assumption failed: hdr not split"); \
  178                 *mtod((m), u_char *) = *(p);\
  179                 *(p) = (i);\
  180                 p = mtod((m), u_char *);\
  181                 (m)->m_next = (mp)->m_next;\
  182                 (mp)->m_next = (m);\
  183                 (mp) = (m);\
  184         }\
  185     } while (/*CONSTCOND*/ 0)
  186 
  187 void
  188 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
  189 {
  190         u_short csum;
  191 
  192         csum = in_cksum_skip(m, offset + plen, offset);
  193         if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
  194                 csum = 0xffff;
  195         offset += m->m_pkthdr.csum_data;        /* checksum offset */
  196 
  197         if (offset + sizeof(u_short) > m->m_len) {
  198                 printf("%s: delayed m_pullup, m->len: %d plen %u off %u "
  199                     "csum_flags=%b\n", __func__, m->m_len, plen, offset,
  200                     (int)m->m_pkthdr.csum_flags, CSUM_BITS);
  201                 /*
  202                  * XXX this should not happen, but if it does, the correct
  203                  * behavior may be to insert the checksum in the appropriate
  204                  * next mbuf in the chain.
  205                  */
  206                 return;
  207         }
  208         *(u_short *)(m->m_data + offset) = csum;
  209 }
  210 
  211 /*
  212  * IP6 output. The packet in mbuf chain m contains a skeletal IP6
  213  * header (with pri, len, nxt, hlim, src, dst).
  214  * This function may modify ver and hlim only.
  215  * The mbuf chain containing the packet will be freed.
  216  * The mbuf opt, if present, will not be freed.
  217  * If route_in6 ro is present and has ro_rt initialized, route lookup would be
  218  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
  219  * then result of route lookup is stored in ro->ro_rt.
  220  *
  221  * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and
  222  * nd_ifinfo.linkmtu is u_int32_t.  so we use u_long to hold largest one,
  223  * which is rt_mtu.
  224  *
  225  * ifpp - XXX: just for statistics
  226  */
  227 int
  228 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
  229     struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
  230     struct ifnet **ifpp, struct inpcb *inp)
  231 {
  232         struct ip6_hdr *ip6, *mhip6;
  233         struct ifnet *ifp, *origifp;
  234         struct mbuf *m = m0;
  235         struct mbuf *mprev = NULL;
  236         int hlen, tlen, len, off;
  237         struct route_in6 ip6route;
  238         struct rtentry *rt = NULL;
  239         struct sockaddr_in6 *dst, src_sa, dst_sa;
  240         struct in6_addr odst;
  241         int error = 0;
  242         struct in6_ifaddr *ia = NULL;
  243         u_long mtu;
  244         int alwaysfrag, dontfrag;
  245         u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
  246         struct ip6_exthdrs exthdrs;
  247         struct in6_addr finaldst, src0, dst0;
  248         u_int32_t zone;
  249         struct route_in6 *ro_pmtu = NULL;
  250         int hdrsplit = 0;
  251         int needipsec = 0;
  252         int sw_csum, tso;
  253 #ifdef IPSEC
  254         struct ipsec_output_state state;
  255         struct ip6_rthdr *rh = NULL;
  256         int needipsectun = 0;
  257         int segleft_org = 0;
  258         struct secpolicy *sp = NULL;
  259 #endif /* IPSEC */
  260         struct m_tag *fwd_tag = NULL;
  261 
  262         ip6 = mtod(m, struct ip6_hdr *);
  263         if (ip6 == NULL) {
  264                 printf ("ip6 is NULL");
  265                 goto bad;
  266         }
  267 
  268         if (inp != NULL)
  269                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
  270 
  271         finaldst = ip6->ip6_dst;
  272         bzero(&exthdrs, sizeof(exthdrs));
  273         if (opt) {
  274                 /* Hop-by-Hop options header */
  275                 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
  276                 /* Destination options header(1st part) */
  277                 if (opt->ip6po_rthdr) {
  278                         /*
  279                          * Destination options header(1st part)
  280                          * This only makes sense with a routing header.
  281                          * See Section 9.2 of RFC 3542.
  282                          * Disabling this part just for MIP6 convenience is
  283                          * a bad idea.  We need to think carefully about a
  284                          * way to make the advanced API coexist with MIP6
  285                          * options, which might automatically be inserted in
  286                          * the kernel.
  287                          */
  288                         MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
  289                 }
  290                 /* Routing header */
  291                 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
  292                 /* Destination options header(2nd part) */
  293                 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
  294         }
  295 
  296 #ifdef IPSEC
  297         /*
  298          * IPSec checking which handles several cases.
  299          * FAST IPSEC: We re-injected the packet.
  300          */
  301         switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp, &sp))
  302         {
  303         case 1:                 /* Bad packet */
  304                 goto freehdrs;
  305         case -1:                /* Do IPSec */
  306                 needipsec = 1;
  307                 /*
  308                  * Do delayed checksums now, as we may send before returning.
  309                  */
  310                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
  311                         plen = m->m_pkthdr.len - sizeof(*ip6);
  312                         in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
  313                         m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
  314                 }
  315 #ifdef SCTP
  316                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
  317                         sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
  318                         m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
  319                 }
  320 #endif
  321         case 0:                 /* No IPSec */
  322         default:
  323                 break;
  324         }
  325 #endif /* IPSEC */
  326 
  327         /*
  328          * Calculate the total length of the extension header chain.
  329          * Keep the length of the unfragmentable part for fragmentation.
  330          */
  331         optlen = 0;
  332         if (exthdrs.ip6e_hbh)
  333                 optlen += exthdrs.ip6e_hbh->m_len;
  334         if (exthdrs.ip6e_dest1)
  335                 optlen += exthdrs.ip6e_dest1->m_len;
  336         if (exthdrs.ip6e_rthdr)
  337                 optlen += exthdrs.ip6e_rthdr->m_len;
  338         unfragpartlen = optlen + sizeof(struct ip6_hdr);
  339 
  340         /* NOTE: we don't add AH/ESP length here. do that later. */
  341         if (exthdrs.ip6e_dest2)
  342                 optlen += exthdrs.ip6e_dest2->m_len;
  343 
  344         /*
  345          * If we need IPsec, or there is at least one extension header,
  346          * separate IP6 header from the payload.
  347          */
  348         if ((needipsec || optlen) && !hdrsplit) {
  349                 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
  350                         m = NULL;
  351                         goto freehdrs;
  352                 }
  353                 m = exthdrs.ip6e_ip6;
  354                 hdrsplit++;
  355         }
  356 
  357         /* adjust pointer */
  358         ip6 = mtod(m, struct ip6_hdr *);
  359 
  360         /* adjust mbuf packet header length */
  361         m->m_pkthdr.len += optlen;
  362         plen = m->m_pkthdr.len - sizeof(*ip6);
  363 
  364         /* If this is a jumbo payload, insert a jumbo payload option. */
  365         if (plen > IPV6_MAXPACKET) {
  366                 if (!hdrsplit) {
  367                         if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
  368                                 m = NULL;
  369                                 goto freehdrs;
  370                         }
  371                         m = exthdrs.ip6e_ip6;
  372                         hdrsplit++;
  373                 }
  374                 /* adjust pointer */
  375                 ip6 = mtod(m, struct ip6_hdr *);
  376                 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
  377                         goto freehdrs;
  378                 ip6->ip6_plen = 0;
  379         } else
  380                 ip6->ip6_plen = htons(plen);
  381 
  382         /*
  383          * Concatenate headers and fill in next header fields.
  384          * Here we have, on "m"
  385          *      IPv6 payload
  386          * and we insert headers accordingly.  Finally, we should be getting:
  387          *      IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
  388          *
  389          * during the header composing process, "m" points to IPv6 header.
  390          * "mprev" points to an extension header prior to esp.
  391          */
  392         u_char *nexthdrp = &ip6->ip6_nxt;
  393         mprev = m;
  394 
  395         /*
  396          * we treat dest2 specially.  this makes IPsec processing
  397          * much easier.  the goal here is to make mprev point the
  398          * mbuf prior to dest2.
  399          *
  400          * result: IPv6 dest2 payload
  401          * m and mprev will point to IPv6 header.
  402          */
  403         if (exthdrs.ip6e_dest2) {
  404                 if (!hdrsplit)
  405                         panic("assumption failed: hdr not split");
  406                 exthdrs.ip6e_dest2->m_next = m->m_next;
  407                 m->m_next = exthdrs.ip6e_dest2;
  408                 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
  409                 ip6->ip6_nxt = IPPROTO_DSTOPTS;
  410         }
  411 
  412         /*
  413          * result: IPv6 hbh dest1 rthdr dest2 payload
  414          * m will point to IPv6 header.  mprev will point to the
  415          * extension header prior to dest2 (rthdr in the above case).
  416          */
  417         MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
  418         MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
  419                    IPPROTO_DSTOPTS);
  420         MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
  421                    IPPROTO_ROUTING);
  422 
  423 #ifdef IPSEC
  424         if (!needipsec)
  425                 goto skip_ipsec2;
  426 
  427         /*
  428          * pointers after IPsec headers are not valid any more.
  429          * other pointers need a great care too.
  430          * (IPsec routines should not mangle mbufs prior to AH/ESP)
  431          */
  432         exthdrs.ip6e_dest2 = NULL;
  433 
  434         if (exthdrs.ip6e_rthdr) {
  435                 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
  436                 segleft_org = rh->ip6r_segleft;
  437                 rh->ip6r_segleft = 0;
  438         }
  439 
  440         bzero(&state, sizeof(state));
  441         state.m = m;
  442         error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags,
  443                                     &needipsectun);
  444         m = state.m;
  445         if (error == EJUSTRETURN) {
  446                 /*
  447                  * We had a SP with a level of 'use' and no SA. We
  448                  * will just continue to process the packet without
  449                  * IPsec processing.
  450                  */
  451                 ;
  452         } else if (error) {
  453                 /* mbuf is already reclaimed in ipsec6_output_trans. */
  454                 m = NULL;
  455                 switch (error) {
  456                 case EHOSTUNREACH:
  457                 case ENETUNREACH:
  458                 case EMSGSIZE:
  459                 case ENOBUFS:
  460                 case ENOMEM:
  461                         break;
  462                 default:
  463                         printf("[%s:%d] (ipsec): error code %d\n",
  464                             __func__, __LINE__, error);
  465                         /* FALLTHROUGH */
  466                 case ENOENT:
  467                         /* don't show these error codes to the user */
  468                         error = 0;
  469                         break;
  470                 }
  471                 goto bad;
  472         } else if (!needipsectun) {
  473                 /*
  474                  * In the FAST IPSec case we have already
  475                  * re-injected the packet and it has been freed
  476                  * by the ipsec_done() function.  So, just clean
  477                  * up after ourselves.
  478                  */
  479                 m = NULL;
  480                 goto done;
  481         }
  482         if (exthdrs.ip6e_rthdr) {
  483                 /* ah6_output doesn't modify mbuf chain */
  484                 rh->ip6r_segleft = segleft_org;
  485         }
  486 skip_ipsec2:;
  487 #endif /* IPSEC */
  488 
  489         /*
  490          * If there is a routing header, discard the packet.
  491          */
  492         if (exthdrs.ip6e_rthdr) {
  493                  error = EINVAL;
  494                  goto bad;
  495         }
  496 
  497         /* Source address validation */
  498         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
  499             (flags & IPV6_UNSPECSRC) == 0) {
  500                 error = EOPNOTSUPP;
  501                 IP6STAT_INC(ip6s_badscope);
  502                 goto bad;
  503         }
  504         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
  505                 error = EOPNOTSUPP;
  506                 IP6STAT_INC(ip6s_badscope);
  507                 goto bad;
  508         }
  509 
  510         IP6STAT_INC(ip6s_localout);
  511 
  512         /*
  513          * Route packet.
  514          */
  515         if (ro == 0) {
  516                 ro = &ip6route;
  517                 bzero((caddr_t)ro, sizeof(*ro));
  518         }
  519         ro_pmtu = ro;
  520         if (opt && opt->ip6po_rthdr)
  521                 ro = &opt->ip6po_route;
  522         dst = (struct sockaddr_in6 *)&ro->ro_dst;
  523 #ifdef FLOWTABLE
  524         if (ro->ro_rt == NULL)
  525                 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro);
  526 #endif
  527 again:
  528         /*
  529          * if specified, try to fill in the traffic class field.
  530          * do not override if a non-zero value is already set.
  531          * we check the diffserv field and the ecn field separately.
  532          */
  533         if (opt && opt->ip6po_tclass >= 0) {
  534                 int mask = 0;
  535 
  536                 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
  537                         mask |= 0xfc;
  538                 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
  539                         mask |= 0x03;
  540                 if (mask != 0)
  541                         ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
  542         }
  543 
  544         /* fill in or override the hop limit field, if necessary. */
  545         if (opt && opt->ip6po_hlim != -1)
  546                 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
  547         else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  548                 if (im6o != NULL)
  549                         ip6->ip6_hlim = im6o->im6o_multicast_hlim;
  550                 else
  551                         ip6->ip6_hlim = V_ip6_defmcasthlim;
  552         }
  553 
  554 #ifdef IPSEC
  555         /*
  556          * We may re-inject packets into the stack here.
  557          */
  558         if (needipsec && needipsectun) {
  559                 struct ipsec_output_state state;
  560 
  561                 /*
  562                  * All the extension headers will become inaccessible
  563                  * (since they can be encrypted).
  564                  * Don't panic, we need no more updates to extension headers
  565                  * on inner IPv6 packet (since they are now encapsulated).
  566                  *
  567                  * IPv6 [ESP|AH] IPv6 [extension headers] payload
  568                  */
  569                 bzero(&exthdrs, sizeof(exthdrs));
  570                 exthdrs.ip6e_ip6 = m;
  571 
  572                 bzero(&state, sizeof(state));
  573                 state.m = m;
  574                 state.ro = (struct route *)ro;
  575                 state.dst = (struct sockaddr *)dst;
  576 
  577                 error = ipsec6_output_tunnel(&state, sp, flags);
  578 
  579                 m = state.m;
  580                 ro = (struct route_in6 *)state.ro;
  581                 dst = (struct sockaddr_in6 *)state.dst;
  582                 if (error == EJUSTRETURN) {
  583                         /*
  584                          * We had a SP with a level of 'use' and no SA. We
  585                          * will just continue to process the packet without
  586                          * IPsec processing.
  587                          */
  588                         ;
  589                 } else if (error) {
  590                         /* mbuf is already reclaimed in ipsec6_output_tunnel. */
  591                         m0 = m = NULL;
  592                         m = NULL;
  593                         switch (error) {
  594                         case EHOSTUNREACH:
  595                         case ENETUNREACH:
  596                         case EMSGSIZE:
  597                         case ENOBUFS:
  598                         case ENOMEM:
  599                                 break;
  600                         default:
  601                                 printf("[%s:%d] (ipsec): error code %d\n",
  602                                     __func__, __LINE__, error);
  603                                 /* FALLTHROUGH */
  604                         case ENOENT:
  605                                 /* don't show these error codes to the user */
  606                                 error = 0;
  607                                 break;
  608                         }
  609                         goto bad;
  610                 } else {
  611                         /*
  612                          * In the FAST IPSec case we have already
  613                          * re-injected the packet and it has been freed
  614                          * by the ipsec_done() function.  So, just clean
  615                          * up after ourselves.
  616                          */
  617                         m = NULL;
  618                         goto done;
  619                 }
  620 
  621                 exthdrs.ip6e_ip6 = m;
  622         }
  623 #endif /* IPSEC */
  624 
  625         /* adjust pointer */
  626         ip6 = mtod(m, struct ip6_hdr *);
  627 
  628         if (ro->ro_rt && fwd_tag == NULL) {
  629                 rt = ro->ro_rt;
  630                 ifp = ro->ro_rt->rt_ifp;
  631         } else {
  632                 if (fwd_tag == NULL) {
  633                         bzero(&dst_sa, sizeof(dst_sa));
  634                         dst_sa.sin6_family = AF_INET6;
  635                         dst_sa.sin6_len = sizeof(dst_sa);
  636                         dst_sa.sin6_addr = ip6->ip6_dst;
  637                 }
  638                 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
  639                     &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m));
  640                 if (error != 0) {
  641                         if (ifp != NULL)
  642                                 in6_ifstat_inc(ifp, ifs6_out_discard);
  643                         goto bad;
  644                 }
  645         }
  646         if (rt == NULL) {
  647                 /*
  648                  * If in6_selectroute() does not return a route entry,
  649                  * dst may not have been updated.
  650                  */
  651                 *dst = dst_sa;  /* XXX */
  652         }
  653 
  654         /*
  655          * then rt (for unicast) and ifp must be non-NULL valid values.
  656          */
  657         if ((flags & IPV6_FORWARDING) == 0) {
  658                 /* XXX: the FORWARDING flag can be set for mrouting. */
  659                 in6_ifstat_inc(ifp, ifs6_out_request);
  660         }
  661         if (rt != NULL) {
  662                 ia = (struct in6_ifaddr *)(rt->rt_ifa);
  663                 counter_u64_add(rt->rt_pksent, 1);
  664         }
  665 
  666 
  667         /*
  668          * The outgoing interface must be in the zone of source and
  669          * destination addresses.
  670          */
  671         origifp = ifp;
  672 
  673         src0 = ip6->ip6_src;
  674         if (in6_setscope(&src0, origifp, &zone))
  675                 goto badscope;
  676         bzero(&src_sa, sizeof(src_sa));
  677         src_sa.sin6_family = AF_INET6;
  678         src_sa.sin6_len = sizeof(src_sa);
  679         src_sa.sin6_addr = ip6->ip6_src;
  680         if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
  681                 goto badscope;
  682 
  683         dst0 = ip6->ip6_dst;
  684         if (in6_setscope(&dst0, origifp, &zone))
  685                 goto badscope;
  686         /* re-initialize to be sure */
  687         bzero(&dst_sa, sizeof(dst_sa));
  688         dst_sa.sin6_family = AF_INET6;
  689         dst_sa.sin6_len = sizeof(dst_sa);
  690         dst_sa.sin6_addr = ip6->ip6_dst;
  691         if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
  692                 goto badscope;
  693         }
  694 
  695         /* We should use ia_ifp to support the case of
  696          * sending packets to an address of our own.
  697          */
  698         if (ia != NULL && ia->ia_ifp)
  699                 ifp = ia->ia_ifp;
  700 
  701         /* scope check is done. */
  702         goto routefound;
  703 
  704   badscope:
  705         IP6STAT_INC(ip6s_badscope);
  706         in6_ifstat_inc(origifp, ifs6_out_discard);
  707         if (error == 0)
  708                 error = EHOSTUNREACH; /* XXX */
  709         goto bad;
  710 
  711   routefound:
  712         if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  713                 if (opt && opt->ip6po_nextroute.ro_rt) {
  714                         /*
  715                          * The nexthop is explicitly specified by the
  716                          * application.  We assume the next hop is an IPv6
  717                          * address.
  718                          */
  719                         dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
  720                 }
  721                 else if ((rt->rt_flags & RTF_GATEWAY))
  722                         dst = (struct sockaddr_in6 *)rt->rt_gateway;
  723         }
  724 
  725         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  726                 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
  727         } else {
  728                 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
  729                 in6_ifstat_inc(ifp, ifs6_out_mcast);
  730                 /*
  731                  * Confirm that the outgoing interface supports multicast.
  732                  */
  733                 if (!(ifp->if_flags & IFF_MULTICAST)) {
  734                         IP6STAT_INC(ip6s_noroute);
  735                         in6_ifstat_inc(ifp, ifs6_out_discard);
  736                         error = ENETUNREACH;
  737                         goto bad;
  738                 }
  739                 if ((im6o == NULL && in6_mcast_loop) ||
  740                     (im6o && im6o->im6o_multicast_loop)) {
  741                         /*
  742                          * Loop back multicast datagram if not expressly
  743                          * forbidden to do so, even if we have not joined
  744                          * the address; protocols will filter it later,
  745                          * thus deferring a hash lookup and lock acquisition
  746                          * at the expense of an m_copym().
  747                          */
  748                         ip6_mloopback(ifp, m, dst);
  749                 } else {
  750                         /*
  751                          * If we are acting as a multicast router, perform
  752                          * multicast forwarding as if the packet had just
  753                          * arrived on the interface to which we are about
  754                          * to send.  The multicast forwarding function
  755                          * recursively calls this function, using the
  756                          * IPV6_FORWARDING flag to prevent infinite recursion.
  757                          *
  758                          * Multicasts that are looped back by ip6_mloopback(),
  759                          * above, will be forwarded by the ip6_input() routine,
  760                          * if necessary.
  761                          */
  762                         if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
  763                                 /*
  764                                  * XXX: ip6_mforward expects that rcvif is NULL
  765                                  * when it is called from the originating path.
  766                                  * However, it may not always be the case.
  767                                  */
  768                                 m->m_pkthdr.rcvif = NULL;
  769                                 if (ip6_mforward(ip6, ifp, m) != 0) {
  770                                         m_freem(m);
  771                                         goto done;
  772                                 }
  773                         }
  774                 }
  775                 /*
  776                  * Multicasts with a hoplimit of zero may be looped back,
  777                  * above, but must not be transmitted on a network.
  778                  * Also, multicasts addressed to the loopback interface
  779                  * are not sent -- the above call to ip6_mloopback() will
  780                  * loop back a copy if this host actually belongs to the
  781                  * destination group on the loopback interface.
  782                  */
  783                 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
  784                     IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
  785                         m_freem(m);
  786                         goto done;
  787                 }
  788         }
  789 
  790         /*
  791          * Fill the outgoing inteface to tell the upper layer
  792          * to increment per-interface statistics.
  793          */
  794         if (ifpp)
  795                 *ifpp = ifp;
  796 
  797         /* Determine path MTU. */
  798         if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
  799             &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0)
  800                 goto bad;
  801 
  802         /*
  803          * The caller of this function may specify to use the minimum MTU
  804          * in some cases.
  805          * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
  806          * setting.  The logic is a bit complicated; by default, unicast
  807          * packets will follow path MTU while multicast packets will be sent at
  808          * the minimum MTU.  If IP6PO_MINMTU_ALL is specified, all packets
  809          * including unicast ones will be sent at the minimum MTU.  Multicast
  810          * packets will always be sent at the minimum MTU unless
  811          * IP6PO_MINMTU_DISABLE is explicitly specified.
  812          * See RFC 3542 for more details.
  813          */
  814         if (mtu > IPV6_MMTU) {
  815                 if ((flags & IPV6_MINMTU))
  816                         mtu = IPV6_MMTU;
  817                 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
  818                         mtu = IPV6_MMTU;
  819                 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
  820                          (opt == NULL ||
  821                           opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
  822                         mtu = IPV6_MMTU;
  823                 }
  824         }
  825 
  826         /*
  827          * clear embedded scope identifiers if necessary.
  828          * in6_clearscope will touch the addresses only when necessary.
  829          */
  830         in6_clearscope(&ip6->ip6_src);
  831         in6_clearscope(&ip6->ip6_dst);
  832 
  833         /*
  834          * If the outgoing packet contains a hop-by-hop options header,
  835          * it must be examined and processed even by the source node.
  836          * (RFC 2460, section 4.)
  837          */
  838         if (exthdrs.ip6e_hbh) {
  839                 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
  840                 u_int32_t dummy; /* XXX unused */
  841                 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
  842 
  843 #ifdef DIAGNOSTIC
  844                 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
  845                         panic("ip6e_hbh is not contiguous");
  846 #endif
  847                 /*
  848                  *  XXX: if we have to send an ICMPv6 error to the sender,
  849                  *       we need the M_LOOP flag since icmp6_error() expects
  850                  *       the IPv6 and the hop-by-hop options header are
  851                  *       contiguous unless the flag is set.
  852                  */
  853                 m->m_flags |= M_LOOP;
  854                 m->m_pkthdr.rcvif = ifp;
  855                 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
  856                     ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
  857                     &dummy, &plen) < 0) {
  858                         /* m was already freed at this point */
  859                         error = EINVAL;/* better error? */
  860                         goto done;
  861                 }
  862                 m->m_flags &= ~M_LOOP; /* XXX */
  863                 m->m_pkthdr.rcvif = NULL;
  864         }
  865 
  866         /* Jump over all PFIL processing if hooks are not active. */
  867         if (!PFIL_HOOKED(&V_inet6_pfil_hook))
  868                 goto passout;
  869 
  870         odst = ip6->ip6_dst;
  871         /* Run through list of hooks for output packets. */
  872         error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp);
  873         if (error != 0 || m == NULL)
  874                 goto done;
  875         ip6 = mtod(m, struct ip6_hdr *);
  876 
  877         /* See if destination IP address was changed by packet filter. */
  878         if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
  879                 m->m_flags |= M_SKIP_FIREWALL;
  880                 /* If destination is now ourself drop to ip6_input(). */
  881                 if (in6_localip(&ip6->ip6_dst)) {
  882                         m->m_flags |= M_FASTFWD_OURS;
  883                         if (m->m_pkthdr.rcvif == NULL)
  884                                 m->m_pkthdr.rcvif = V_loif;
  885                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
  886                                 m->m_pkthdr.csum_flags |=
  887                                     CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
  888                                 m->m_pkthdr.csum_data = 0xffff;
  889                         }
  890 #ifdef SCTP
  891                         if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
  892                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
  893 #endif
  894                         error = netisr_queue(NETISR_IPV6, m);
  895                         goto done;
  896                 } else
  897                         goto again;     /* Redo the routing table lookup. */
  898         }
  899 
  900         /* See if local, if yes, send it to netisr. */
  901         if (m->m_flags & M_FASTFWD_OURS) {
  902                 if (m->m_pkthdr.rcvif == NULL)
  903                         m->m_pkthdr.rcvif = V_loif;
  904                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
  905                         m->m_pkthdr.csum_flags |=
  906                             CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
  907                         m->m_pkthdr.csum_data = 0xffff;
  908                 }
  909 #ifdef SCTP
  910                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
  911                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
  912 #endif
  913                 error = netisr_queue(NETISR_IPV6, m);
  914                 goto done;
  915         }
  916         /* Or forward to some other address? */
  917         if ((m->m_flags & M_IP6_NEXTHOP) &&
  918             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
  919                 dst = (struct sockaddr_in6 *)&ro->ro_dst;
  920                 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
  921                 m->m_flags |= M_SKIP_FIREWALL;
  922                 m->m_flags &= ~M_IP6_NEXTHOP;
  923                 m_tag_delete(m, fwd_tag);
  924                 goto again;
  925         }
  926 
  927 passout:
  928         /*
  929          * Send the packet to the outgoing interface.
  930          * If necessary, do IPv6 fragmentation before sending.
  931          *
  932          * the logic here is rather complex:
  933          * 1: normal case (dontfrag == 0, alwaysfrag == 0)
  934          * 1-a: send as is if tlen <= path mtu
  935          * 1-b: fragment if tlen > path mtu
  936          *
  937          * 2: if user asks us not to fragment (dontfrag == 1)
  938          * 2-a: send as is if tlen <= interface mtu
  939          * 2-b: error if tlen > interface mtu
  940          *
  941          * 3: if we always need to attach fragment header (alwaysfrag == 1)
  942          *      always fragment
  943          *
  944          * 4: if dontfrag == 1 && alwaysfrag == 1
  945          *      error, as we cannot handle this conflicting request
  946          */
  947         sw_csum = m->m_pkthdr.csum_flags;
  948         if (!hdrsplit) {
  949                 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0;
  950                 sw_csum &= ~ifp->if_hwassist;
  951         } else
  952                 tso = 0;
  953         /*
  954          * If we added extension headers, we will not do TSO and calculate the
  955          * checksums ourselves for now.
  956          * XXX-BZ  Need a framework to know when the NIC can handle it, even
  957          * with ext. hdrs.
  958          */
  959         if (sw_csum & CSUM_DELAY_DATA_IPV6) {
  960                 sw_csum &= ~CSUM_DELAY_DATA_IPV6;
  961                 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
  962         }
  963 #ifdef SCTP
  964         if (sw_csum & CSUM_SCTP_IPV6) {
  965                 sw_csum &= ~CSUM_SCTP_IPV6;
  966                 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
  967         }
  968 #endif
  969         m->m_pkthdr.csum_flags &= ifp->if_hwassist;
  970         tlen = m->m_pkthdr.len;
  971 
  972         if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
  973                 dontfrag = 1;
  974         else
  975                 dontfrag = 0;
  976         if (dontfrag && alwaysfrag) {   /* case 4 */
  977                 /* conflicting request - can't transmit */
  978                 error = EMSGSIZE;
  979                 goto bad;
  980         }
  981         if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) {      /* case 2-b */
  982                 /*
  983                  * Even if the DONTFRAG option is specified, we cannot send the
  984                  * packet when the data length is larger than the MTU of the
  985                  * outgoing interface.
  986                  * Notify the error by sending IPV6_PATHMTU ancillary data as
  987                  * well as returning an error code (the latter is not described
  988                  * in the API spec.)
  989                  */
  990                 u_int32_t mtu32;
  991                 struct ip6ctlparam ip6cp;
  992 
  993                 mtu32 = (u_int32_t)mtu;
  994                 bzero(&ip6cp, sizeof(ip6cp));
  995                 ip6cp.ip6c_cmdarg = (void *)&mtu32;
  996                 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
  997                     (void *)&ip6cp);
  998 
  999                 error = EMSGSIZE;
 1000                 goto bad;
 1001         }
 1002 
 1003         /*
 1004          * transmit packet without fragmentation
 1005          */
 1006         if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
 1007                 struct in6_ifaddr *ia6;
 1008 
 1009                 ip6 = mtod(m, struct ip6_hdr *);
 1010                 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
 1011                 if (ia6) {
 1012                         /* Record statistics for this interface address. */
 1013                         ia6->ia_ifa.if_opackets++;
 1014                         ia6->ia_ifa.if_obytes += m->m_pkthdr.len;
 1015                         ifa_free(&ia6->ia_ifa);
 1016                 }
 1017                 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
 1018                 goto done;
 1019         }
 1020 
 1021         /*
 1022          * try to fragment the packet.  case 1-b and 3
 1023          */
 1024         if (mtu < IPV6_MMTU) {
 1025                 /* path MTU cannot be less than IPV6_MMTU */
 1026                 error = EMSGSIZE;
 1027                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
 1028                 goto bad;
 1029         } else if (ip6->ip6_plen == 0) {
 1030                 /* jumbo payload cannot be fragmented */
 1031                 error = EMSGSIZE;
 1032                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
 1033                 goto bad;
 1034         } else {
 1035                 struct mbuf **mnext, *m_frgpart;
 1036                 struct ip6_frag *ip6f;
 1037                 u_int32_t id = htonl(ip6_randomid());
 1038                 u_char nextproto;
 1039 
 1040                 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len;
 1041 
 1042                 /*
 1043                  * Too large for the destination or interface;
 1044                  * fragment if possible.
 1045                  * Must be able to put at least 8 bytes per fragment.
 1046                  */
 1047                 hlen = unfragpartlen;
 1048                 if (mtu > IPV6_MAXPACKET)
 1049                         mtu = IPV6_MAXPACKET;
 1050 
 1051                 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
 1052                 if (len < 8) {
 1053                         error = EMSGSIZE;
 1054                         in6_ifstat_inc(ifp, ifs6_out_fragfail);
 1055                         goto bad;
 1056                 }
 1057 
 1058                 /*
 1059                  * Verify that we have any chance at all of being able to queue
 1060                  *      the packet or packet fragments
 1061                  */
 1062                 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen)
 1063                     < tlen  /* - hlen */)) {
 1064                         error = ENOBUFS;
 1065                         IP6STAT_INC(ip6s_odropped);
 1066                         goto bad;
 1067                 }
 1068 
 1069 
 1070                 /*
 1071                  * If the interface will not calculate checksums on
 1072                  * fragmented packets, then do it here.
 1073                  * XXX-BZ handle the hw offloading case.  Need flags.
 1074                  */
 1075                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
 1076                         in6_delayed_cksum(m, plen, hlen);
 1077                         m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
 1078                 }
 1079 #ifdef SCTP
 1080                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
 1081                         sctp_delayed_cksum(m, hlen);
 1082                         m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
 1083                 }
 1084 #endif
 1085                 mnext = &m->m_nextpkt;
 1086 
 1087                 /*
 1088                  * Change the next header field of the last header in the
 1089                  * unfragmentable part.
 1090                  */
 1091                 if (exthdrs.ip6e_rthdr) {
 1092                         nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
 1093                         *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
 1094                 } else if (exthdrs.ip6e_dest1) {
 1095                         nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
 1096                         *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
 1097                 } else if (exthdrs.ip6e_hbh) {
 1098                         nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
 1099                         *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
 1100                 } else {
 1101                         nextproto = ip6->ip6_nxt;
 1102                         ip6->ip6_nxt = IPPROTO_FRAGMENT;
 1103                 }
 1104 
 1105                 /*
 1106                  * Loop through length of segment after first fragment,
 1107                  * make new header and copy data of each part and link onto
 1108                  * chain.
 1109                  */
 1110                 m0 = m;
 1111                 for (off = hlen; off < tlen; off += len) {
 1112                         m = m_gethdr(M_NOWAIT, MT_DATA);
 1113                         if (!m) {
 1114                                 error = ENOBUFS;
 1115                                 IP6STAT_INC(ip6s_odropped);
 1116                                 goto sendorfree;
 1117                         }
 1118                         m->m_flags = m0->m_flags & M_COPYFLAGS;
 1119                         *mnext = m;
 1120                         mnext = &m->m_nextpkt;
 1121                         m->m_data += max_linkhdr;
 1122                         mhip6 = mtod(m, struct ip6_hdr *);
 1123                         *mhip6 = *ip6;
 1124                         m->m_len = sizeof(*mhip6);
 1125                         error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
 1126                         if (error) {
 1127                                 IP6STAT_INC(ip6s_odropped);
 1128                                 goto sendorfree;
 1129                         }
 1130                         ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
 1131                         if (off + len >= tlen)
 1132                                 len = tlen - off;
 1133                         else
 1134                                 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
 1135                         mhip6->ip6_plen = htons((u_short)(len + hlen +
 1136                             sizeof(*ip6f) - sizeof(struct ip6_hdr)));
 1137                         if ((m_frgpart = m_copy(m0, off, len)) == 0) {
 1138                                 error = ENOBUFS;
 1139                                 IP6STAT_INC(ip6s_odropped);
 1140                                 goto sendorfree;
 1141                         }
 1142                         m_cat(m, m_frgpart);
 1143                         m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
 1144                         m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
 1145                         m->m_pkthdr.rcvif = NULL;
 1146                         ip6f->ip6f_reserved = 0;
 1147                         ip6f->ip6f_ident = id;
 1148                         ip6f->ip6f_nxt = nextproto;
 1149                         IP6STAT_INC(ip6s_ofragments);
 1150                         in6_ifstat_inc(ifp, ifs6_out_fragcreat);
 1151                 }
 1152 
 1153                 in6_ifstat_inc(ifp, ifs6_out_fragok);
 1154         }
 1155 
 1156         /*
 1157          * Remove leading garbages.
 1158          */
 1159 sendorfree:
 1160         m = m0->m_nextpkt;
 1161         m0->m_nextpkt = 0;
 1162         m_freem(m0);
 1163         for (m0 = m; m; m = m0) {
 1164                 m0 = m->m_nextpkt;
 1165                 m->m_nextpkt = 0;
 1166                 if (error == 0) {
 1167                         /* Record statistics for this interface address. */
 1168                         if (ia) {
 1169                                 ia->ia_ifa.if_opackets++;
 1170                                 ia->ia_ifa.if_obytes += m->m_pkthdr.len;
 1171                         }
 1172                         error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
 1173                 } else
 1174                         m_freem(m);
 1175         }
 1176 
 1177         if (error == 0)
 1178                 IP6STAT_INC(ip6s_fragmented);
 1179 
 1180 done:
 1181         if (ro == &ip6route)
 1182                 RO_RTFREE(ro);
 1183         if (ro_pmtu == &ip6route)
 1184                 RO_RTFREE(ro_pmtu);
 1185 #ifdef IPSEC
 1186         if (sp != NULL)
 1187                 KEY_FREESP(&sp);
 1188 #endif
 1189 
 1190         return (error);
 1191 
 1192 freehdrs:
 1193         m_freem(exthdrs.ip6e_hbh);      /* m_freem will check if mbuf is 0 */
 1194         m_freem(exthdrs.ip6e_dest1);
 1195         m_freem(exthdrs.ip6e_rthdr);
 1196         m_freem(exthdrs.ip6e_dest2);
 1197         /* FALLTHROUGH */
 1198 bad:
 1199         if (m)
 1200                 m_freem(m);
 1201         goto done;
 1202 }
 1203 
 1204 static int
 1205 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
 1206 {
 1207         struct mbuf *m;
 1208 
 1209         if (hlen > MCLBYTES)
 1210                 return (ENOBUFS); /* XXX */
 1211 
 1212         if (hlen > MLEN)
 1213                 m = m_getcl(M_NOWAIT, MT_DATA, 0);
 1214         else
 1215                 m = m_get(M_NOWAIT, MT_DATA);
 1216         if (m == NULL)
 1217                 return (ENOBUFS);
 1218         m->m_len = hlen;
 1219         if (hdr)
 1220                 bcopy(hdr, mtod(m, caddr_t), hlen);
 1221 
 1222         *mp = m;
 1223         return (0);
 1224 }
 1225 
 1226 /*
 1227  * Insert jumbo payload option.
 1228  */
 1229 static int
 1230 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
 1231 {
 1232         struct mbuf *mopt;
 1233         u_char *optbuf;
 1234         u_int32_t v;
 1235 
 1236 #define JUMBOOPTLEN     8       /* length of jumbo payload option and padding */
 1237 
 1238         /*
 1239          * If there is no hop-by-hop options header, allocate new one.
 1240          * If there is one but it doesn't have enough space to store the
 1241          * jumbo payload option, allocate a cluster to store the whole options.
 1242          * Otherwise, use it to store the options.
 1243          */
 1244         if (exthdrs->ip6e_hbh == 0) {
 1245                 mopt = m_get(M_NOWAIT, MT_DATA);
 1246                 if (mopt == NULL)
 1247                         return (ENOBUFS);
 1248                 mopt->m_len = JUMBOOPTLEN;
 1249                 optbuf = mtod(mopt, u_char *);
 1250                 optbuf[1] = 0;  /* = ((JUMBOOPTLEN) >> 3) - 1 */
 1251                 exthdrs->ip6e_hbh = mopt;
 1252         } else {
 1253                 struct ip6_hbh *hbh;
 1254 
 1255                 mopt = exthdrs->ip6e_hbh;
 1256                 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
 1257                         /*
 1258                          * XXX assumption:
 1259                          * - exthdrs->ip6e_hbh is not referenced from places
 1260                          *   other than exthdrs.
 1261                          * - exthdrs->ip6e_hbh is not an mbuf chain.
 1262                          */
 1263                         int oldoptlen = mopt->m_len;
 1264                         struct mbuf *n;
 1265 
 1266                         /*
 1267                          * XXX: give up if the whole (new) hbh header does
 1268                          * not fit even in an mbuf cluster.
 1269                          */
 1270                         if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
 1271                                 return (ENOBUFS);
 1272 
 1273                         /*
 1274                          * As a consequence, we must always prepare a cluster
 1275                          * at this point.
 1276                          */
 1277                         n = m_getcl(M_NOWAIT, MT_DATA, 0);
 1278                         if (n == NULL)
 1279                                 return (ENOBUFS);
 1280                         n->m_len = oldoptlen + JUMBOOPTLEN;
 1281                         bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
 1282                             oldoptlen);
 1283                         optbuf = mtod(n, caddr_t) + oldoptlen;
 1284                         m_freem(mopt);
 1285                         mopt = exthdrs->ip6e_hbh = n;
 1286                 } else {
 1287                         optbuf = mtod(mopt, u_char *) + mopt->m_len;
 1288                         mopt->m_len += JUMBOOPTLEN;
 1289                 }
 1290                 optbuf[0] = IP6OPT_PADN;
 1291                 optbuf[1] = 1;
 1292 
 1293                 /*
 1294                  * Adjust the header length according to the pad and
 1295                  * the jumbo payload option.
 1296                  */
 1297                 hbh = mtod(mopt, struct ip6_hbh *);
 1298                 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
 1299         }
 1300 
 1301         /* fill in the option. */
 1302         optbuf[2] = IP6OPT_JUMBO;
 1303         optbuf[3] = 4;
 1304         v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
 1305         bcopy(&v, &optbuf[4], sizeof(u_int32_t));
 1306 
 1307         /* finally, adjust the packet header length */
 1308         exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
 1309 
 1310         return (0);
 1311 #undef JUMBOOPTLEN
 1312 }
 1313 
 1314 /*
 1315  * Insert fragment header and copy unfragmentable header portions.
 1316  */
 1317 static int
 1318 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
 1319     struct ip6_frag **frghdrp)
 1320 {
 1321         struct mbuf *n, *mlast;
 1322 
 1323         if (hlen > sizeof(struct ip6_hdr)) {
 1324                 n = m_copym(m0, sizeof(struct ip6_hdr),
 1325                     hlen - sizeof(struct ip6_hdr), M_NOWAIT);
 1326                 if (n == 0)
 1327                         return (ENOBUFS);
 1328                 m->m_next = n;
 1329         } else
 1330                 n = m;
 1331 
 1332         /* Search for the last mbuf of unfragmentable part. */
 1333         for (mlast = n; mlast->m_next; mlast = mlast->m_next)
 1334                 ;
 1335 
 1336         if ((mlast->m_flags & M_EXT) == 0 &&
 1337             M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
 1338                 /* use the trailing space of the last mbuf for the fragment hdr */
 1339                 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
 1340                     mlast->m_len);
 1341                 mlast->m_len += sizeof(struct ip6_frag);
 1342                 m->m_pkthdr.len += sizeof(struct ip6_frag);
 1343         } else {
 1344                 /* allocate a new mbuf for the fragment header */
 1345                 struct mbuf *mfrg;
 1346 
 1347                 mfrg = m_get(M_NOWAIT, MT_DATA);
 1348                 if (mfrg == NULL)
 1349                         return (ENOBUFS);
 1350                 mfrg->m_len = sizeof(struct ip6_frag);
 1351                 *frghdrp = mtod(mfrg, struct ip6_frag *);
 1352                 mlast->m_next = mfrg;
 1353         }
 1354 
 1355         return (0);
 1356 }
 1357 
 1358 static int
 1359 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro,
 1360     struct ifnet *ifp, struct in6_addr *dst, u_long *mtup,
 1361     int *alwaysfragp, u_int fibnum)
 1362 {
 1363         u_int32_t mtu = 0;
 1364         int alwaysfrag = 0;
 1365         int error = 0;
 1366 
 1367         if (ro_pmtu != ro) {
 1368                 /* The first hop and the final destination may differ. */
 1369                 struct sockaddr_in6 *sa6_dst =
 1370                     (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
 1371                 if (ro_pmtu->ro_rt &&
 1372                     ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
 1373                      !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
 1374                         RTFREE(ro_pmtu->ro_rt);
 1375                         ro_pmtu->ro_rt = (struct rtentry *)NULL;
 1376                 }
 1377                 if (ro_pmtu->ro_rt == NULL) {
 1378                         bzero(sa6_dst, sizeof(*sa6_dst));
 1379                         sa6_dst->sin6_family = AF_INET6;
 1380                         sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
 1381                         sa6_dst->sin6_addr = *dst;
 1382 
 1383                         in6_rtalloc(ro_pmtu, fibnum);
 1384                 }
 1385         }
 1386         if (ro_pmtu->ro_rt) {
 1387                 u_int32_t ifmtu;
 1388                 struct in_conninfo inc;
 1389 
 1390                 bzero(&inc, sizeof(inc));
 1391                 inc.inc_flags |= INC_ISIPV6;
 1392                 inc.inc6_faddr = *dst;
 1393 
 1394                 if (ifp == NULL)
 1395                         ifp = ro_pmtu->ro_rt->rt_ifp;
 1396                 ifmtu = IN6_LINKMTU(ifp);
 1397                 mtu = tcp_hc_getmtu(&inc);
 1398                 if (mtu)
 1399                         mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu);
 1400                 else
 1401                         mtu = ro_pmtu->ro_rt->rt_mtu;
 1402                 if (mtu == 0)
 1403                         mtu = ifmtu;
 1404                 else if (mtu < IPV6_MMTU) {
 1405                         /*
 1406                          * RFC2460 section 5, last paragraph:
 1407                          * if we record ICMPv6 too big message with
 1408                          * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
 1409                          * or smaller, with framgent header attached.
 1410                          * (fragment header is needed regardless from the
 1411                          * packet size, for translators to identify packets)
 1412                          */
 1413                         alwaysfrag = 1;
 1414                         mtu = IPV6_MMTU;
 1415                 } else if (mtu > ifmtu) {
 1416                         /*
 1417                          * The MTU on the route is larger than the MTU on
 1418                          * the interface!  This shouldn't happen, unless the
 1419                          * MTU of the interface has been changed after the
 1420                          * interface was brought up.  Change the MTU in the
 1421                          * route to match the interface MTU (as long as the
 1422                          * field isn't locked).
 1423                          */
 1424                         mtu = ifmtu;
 1425                         ro_pmtu->ro_rt->rt_mtu = mtu;
 1426                 }
 1427         } else if (ifp) {
 1428                 mtu = IN6_LINKMTU(ifp);
 1429         } else
 1430                 error = EHOSTUNREACH; /* XXX */
 1431 
 1432         *mtup = mtu;
 1433         if (alwaysfragp)
 1434                 *alwaysfragp = alwaysfrag;
 1435         return (error);
 1436 }
 1437 
 1438 /*
 1439  * IP6 socket option processing.
 1440  */
 1441 int
 1442 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
 1443 {
 1444         int optdatalen, uproto;
 1445         void *optdata;
 1446         struct inpcb *in6p = sotoinpcb(so);
 1447         int error, optval;
 1448         int level, op, optname;
 1449         int optlen;
 1450         struct thread *td;
 1451 
 1452         level = sopt->sopt_level;
 1453         op = sopt->sopt_dir;
 1454         optname = sopt->sopt_name;
 1455         optlen = sopt->sopt_valsize;
 1456         td = sopt->sopt_td;
 1457         error = 0;
 1458         optval = 0;
 1459         uproto = (int)so->so_proto->pr_protocol;
 1460 
 1461         if (level != IPPROTO_IPV6) {
 1462                 error = EINVAL;
 1463 
 1464                 if (sopt->sopt_level == SOL_SOCKET &&
 1465                     sopt->sopt_dir == SOPT_SET) {
 1466                         switch (sopt->sopt_name) {
 1467                         case SO_REUSEADDR:
 1468                                 INP_WLOCK(in6p);
 1469                                 if ((so->so_options & SO_REUSEADDR) != 0)
 1470                                         in6p->inp_flags2 |= INP_REUSEADDR;
 1471                                 else
 1472                                         in6p->inp_flags2 &= ~INP_REUSEADDR;
 1473                                 INP_WUNLOCK(in6p);
 1474                                 error = 0;
 1475                                 break;
 1476                         case SO_REUSEPORT:
 1477                                 INP_WLOCK(in6p);
 1478                                 if ((so->so_options & SO_REUSEPORT) != 0)
 1479                                         in6p->inp_flags2 |= INP_REUSEPORT;
 1480                                 else
 1481                                         in6p->inp_flags2 &= ~INP_REUSEPORT;
 1482                                 INP_WUNLOCK(in6p);
 1483                                 error = 0;
 1484                                 break;
 1485                         case SO_SETFIB:
 1486                                 INP_WLOCK(in6p);
 1487                                 in6p->inp_inc.inc_fibnum = so->so_fibnum;
 1488                                 INP_WUNLOCK(in6p);
 1489                                 error = 0;
 1490                                 break;
 1491                         default:
 1492                                 break;
 1493                         }
 1494                 }
 1495         } else {                /* level == IPPROTO_IPV6 */
 1496                 switch (op) {
 1497 
 1498                 case SOPT_SET:
 1499                         switch (optname) {
 1500                         case IPV6_2292PKTOPTIONS:
 1501 #ifdef IPV6_PKTOPTIONS
 1502                         case IPV6_PKTOPTIONS:
 1503 #endif
 1504                         {
 1505                                 struct mbuf *m;
 1506 
 1507                                 error = soopt_getm(sopt, &m); /* XXX */
 1508                                 if (error != 0)
 1509                                         break;
 1510                                 error = soopt_mcopyin(sopt, m); /* XXX */
 1511                                 if (error != 0)
 1512                                         break;
 1513                                 error = ip6_pcbopts(&in6p->in6p_outputopts,
 1514                                                     m, so, sopt);
 1515                                 m_freem(m); /* XXX */
 1516                                 break;
 1517                         }
 1518 
 1519                         /*
 1520                          * Use of some Hop-by-Hop options or some
 1521                          * Destination options, might require special
 1522                          * privilege.  That is, normal applications
 1523                          * (without special privilege) might be forbidden
 1524                          * from setting certain options in outgoing packets,
 1525                          * and might never see certain options in received
 1526                          * packets. [RFC 2292 Section 6]
 1527                          * KAME specific note:
 1528                          *  KAME prevents non-privileged users from sending or
 1529                          *  receiving ANY hbh/dst options in order to avoid
 1530                          *  overhead of parsing options in the kernel.
 1531                          */
 1532                         case IPV6_RECVHOPOPTS:
 1533                         case IPV6_RECVDSTOPTS:
 1534                         case IPV6_RECVRTHDRDSTOPTS:
 1535                                 if (td != NULL) {
 1536                                         error = priv_check(td,
 1537                                             PRIV_NETINET_SETHDROPTS);
 1538                                         if (error)
 1539                                                 break;
 1540                                 }
 1541                                 /* FALLTHROUGH */
 1542                         case IPV6_UNICAST_HOPS:
 1543                         case IPV6_HOPLIMIT:
 1544                         case IPV6_FAITH:
 1545 
 1546                         case IPV6_RECVPKTINFO:
 1547                         case IPV6_RECVHOPLIMIT:
 1548                         case IPV6_RECVRTHDR:
 1549                         case IPV6_RECVPATHMTU:
 1550                         case IPV6_RECVTCLASS:
 1551                         case IPV6_V6ONLY:
 1552                         case IPV6_AUTOFLOWLABEL:
 1553                         case IPV6_BINDANY:
 1554                                 if (optname == IPV6_BINDANY && td != NULL) {
 1555                                         error = priv_check(td,
 1556                                             PRIV_NETINET_BINDANY);
 1557                                         if (error)
 1558                                                 break;
 1559                                 }
 1560 
 1561                                 if (optlen != sizeof(int)) {
 1562                                         error = EINVAL;
 1563                                         break;
 1564                                 }
 1565                                 error = sooptcopyin(sopt, &optval,
 1566                                         sizeof optval, sizeof optval);
 1567                                 if (error)
 1568                                         break;
 1569                                 switch (optname) {
 1570 
 1571                                 case IPV6_UNICAST_HOPS:
 1572                                         if (optval < -1 || optval >= 256)
 1573                                                 error = EINVAL;
 1574                                         else {
 1575                                                 /* -1 = kernel default */
 1576                                                 in6p->in6p_hops = optval;
 1577                                                 if ((in6p->inp_vflag &
 1578                                                      INP_IPV4) != 0)
 1579                                                         in6p->inp_ip_ttl = optval;
 1580                                         }
 1581                                         break;
 1582 #define OPTSET(bit) \
 1583 do { \
 1584         INP_WLOCK(in6p); \
 1585         if (optval) \
 1586                 in6p->inp_flags |= (bit); \
 1587         else \
 1588                 in6p->inp_flags &= ~(bit); \
 1589         INP_WUNLOCK(in6p); \
 1590 } while (/*CONSTCOND*/ 0)
 1591 #define OPTSET2292(bit) \
 1592 do { \
 1593         INP_WLOCK(in6p); \
 1594         in6p->inp_flags |= IN6P_RFC2292; \
 1595         if (optval) \
 1596                 in6p->inp_flags |= (bit); \
 1597         else \
 1598                 in6p->inp_flags &= ~(bit); \
 1599         INP_WUNLOCK(in6p); \
 1600 } while (/*CONSTCOND*/ 0)
 1601 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
 1602 
 1603                                 case IPV6_RECVPKTINFO:
 1604                                         /* cannot mix with RFC2292 */
 1605                                         if (OPTBIT(IN6P_RFC2292)) {
 1606                                                 error = EINVAL;
 1607                                                 break;
 1608                                         }
 1609                                         OPTSET(IN6P_PKTINFO);
 1610                                         break;
 1611 
 1612                                 case IPV6_HOPLIMIT:
 1613                                 {
 1614                                         struct ip6_pktopts **optp;
 1615 
 1616                                         /* cannot mix with RFC2292 */
 1617                                         if (OPTBIT(IN6P_RFC2292)) {
 1618                                                 error = EINVAL;
 1619                                                 break;
 1620                                         }
 1621                                         optp = &in6p->in6p_outputopts;
 1622                                         error = ip6_pcbopt(IPV6_HOPLIMIT,
 1623                                             (u_char *)&optval, sizeof(optval),
 1624                                             optp, (td != NULL) ? td->td_ucred :
 1625                                             NULL, uproto);
 1626                                         break;
 1627                                 }
 1628 
 1629                                 case IPV6_RECVHOPLIMIT:
 1630                                         /* cannot mix with RFC2292 */
 1631                                         if (OPTBIT(IN6P_RFC2292)) {
 1632                                                 error = EINVAL;
 1633                                                 break;
 1634                                         }
 1635                                         OPTSET(IN6P_HOPLIMIT);
 1636                                         break;
 1637 
 1638                                 case IPV6_RECVHOPOPTS:
 1639                                         /* cannot mix with RFC2292 */
 1640                                         if (OPTBIT(IN6P_RFC2292)) {
 1641                                                 error = EINVAL;
 1642                                                 break;
 1643                                         }
 1644                                         OPTSET(IN6P_HOPOPTS);
 1645                                         break;
 1646 
 1647                                 case IPV6_RECVDSTOPTS:
 1648                                         /* cannot mix with RFC2292 */
 1649                                         if (OPTBIT(IN6P_RFC2292)) {
 1650                                                 error = EINVAL;
 1651                                                 break;
 1652                                         }
 1653                                         OPTSET(IN6P_DSTOPTS);
 1654                                         break;
 1655 
 1656                                 case IPV6_RECVRTHDRDSTOPTS:
 1657                                         /* cannot mix with RFC2292 */
 1658                                         if (OPTBIT(IN6P_RFC2292)) {
 1659                                                 error = EINVAL;
 1660                                                 break;
 1661                                         }
 1662                                         OPTSET(IN6P_RTHDRDSTOPTS);
 1663                                         break;
 1664 
 1665                                 case IPV6_RECVRTHDR:
 1666                                         /* cannot mix with RFC2292 */
 1667                                         if (OPTBIT(IN6P_RFC2292)) {
 1668                                                 error = EINVAL;
 1669                                                 break;
 1670                                         }
 1671                                         OPTSET(IN6P_RTHDR);
 1672                                         break;
 1673 
 1674                                 case IPV6_FAITH:
 1675                                         OPTSET(INP_FAITH);
 1676                                         break;
 1677 
 1678                                 case IPV6_RECVPATHMTU:
 1679                                         /*
 1680                                          * We ignore this option for TCP
 1681                                          * sockets.
 1682                                          * (RFC3542 leaves this case
 1683                                          * unspecified.)
 1684                                          */
 1685                                         if (uproto != IPPROTO_TCP)
 1686                                                 OPTSET(IN6P_MTU);
 1687                                         break;
 1688 
 1689                                 case IPV6_V6ONLY:
 1690                                         /*
 1691                                          * make setsockopt(IPV6_V6ONLY)
 1692                                          * available only prior to bind(2).
 1693                                          * see ipng mailing list, Jun 22 2001.
 1694                                          */
 1695                                         if (in6p->inp_lport ||
 1696                                             !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 1697                                                 error = EINVAL;
 1698                                                 break;
 1699                                         }
 1700                                         OPTSET(IN6P_IPV6_V6ONLY);
 1701                                         if (optval)
 1702                                                 in6p->inp_vflag &= ~INP_IPV4;
 1703                                         else
 1704                                                 in6p->inp_vflag |= INP_IPV4;
 1705                                         break;
 1706                                 case IPV6_RECVTCLASS:
 1707                                         /* cannot mix with RFC2292 XXX */
 1708                                         if (OPTBIT(IN6P_RFC2292)) {
 1709                                                 error = EINVAL;
 1710                                                 break;
 1711                                         }
 1712                                         OPTSET(IN6P_TCLASS);
 1713                                         break;
 1714                                 case IPV6_AUTOFLOWLABEL:
 1715                                         OPTSET(IN6P_AUTOFLOWLABEL);
 1716                                         break;
 1717 
 1718                                 case IPV6_BINDANY:
 1719                                         OPTSET(INP_BINDANY);
 1720                                         break;
 1721                                 }
 1722                                 break;
 1723 
 1724                         case IPV6_TCLASS:
 1725                         case IPV6_DONTFRAG:
 1726                         case IPV6_USE_MIN_MTU:
 1727                         case IPV6_PREFER_TEMPADDR:
 1728                                 if (optlen != sizeof(optval)) {
 1729                                         error = EINVAL;
 1730                                         break;
 1731                                 }
 1732                                 error = sooptcopyin(sopt, &optval,
 1733                                         sizeof optval, sizeof optval);
 1734                                 if (error)
 1735                                         break;
 1736                                 {
 1737                                         struct ip6_pktopts **optp;
 1738                                         optp = &in6p->in6p_outputopts;
 1739                                         error = ip6_pcbopt(optname,
 1740                                             (u_char *)&optval, sizeof(optval),
 1741                                             optp, (td != NULL) ? td->td_ucred :
 1742                                             NULL, uproto);
 1743                                         break;
 1744                                 }
 1745 
 1746                         case IPV6_2292PKTINFO:
 1747                         case IPV6_2292HOPLIMIT:
 1748                         case IPV6_2292HOPOPTS:
 1749                         case IPV6_2292DSTOPTS:
 1750                         case IPV6_2292RTHDR:
 1751                                 /* RFC 2292 */
 1752                                 if (optlen != sizeof(int)) {
 1753                                         error = EINVAL;
 1754                                         break;
 1755                                 }
 1756                                 error = sooptcopyin(sopt, &optval,
 1757                                         sizeof optval, sizeof optval);
 1758                                 if (error)
 1759                                         break;
 1760                                 switch (optname) {
 1761                                 case IPV6_2292PKTINFO:
 1762                                         OPTSET2292(IN6P_PKTINFO);
 1763                                         break;
 1764                                 case IPV6_2292HOPLIMIT:
 1765                                         OPTSET2292(IN6P_HOPLIMIT);
 1766                                         break;
 1767                                 case IPV6_2292HOPOPTS:
 1768                                         /*
 1769                                          * Check super-user privilege.
 1770                                          * See comments for IPV6_RECVHOPOPTS.
 1771                                          */
 1772                                         if (td != NULL) {
 1773                                                 error = priv_check(td,
 1774                                                     PRIV_NETINET_SETHDROPTS);
 1775                                                 if (error)
 1776                                                         return (error);
 1777                                         }
 1778                                         OPTSET2292(IN6P_HOPOPTS);
 1779                                         break;
 1780                                 case IPV6_2292DSTOPTS:
 1781                                         if (td != NULL) {
 1782                                                 error = priv_check(td,
 1783                                                     PRIV_NETINET_SETHDROPTS);
 1784                                                 if (error)
 1785                                                         return (error);
 1786                                         }
 1787                                         OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
 1788                                         break;
 1789                                 case IPV6_2292RTHDR:
 1790                                         OPTSET2292(IN6P_RTHDR);
 1791                                         break;
 1792                                 }
 1793                                 break;
 1794                         case IPV6_PKTINFO:
 1795                         case IPV6_HOPOPTS:
 1796                         case IPV6_RTHDR:
 1797                         case IPV6_DSTOPTS:
 1798                         case IPV6_RTHDRDSTOPTS:
 1799                         case IPV6_NEXTHOP:
 1800                         {
 1801                                 /* new advanced API (RFC3542) */
 1802                                 u_char *optbuf;
 1803                                 u_char optbuf_storage[MCLBYTES];
 1804                                 int optlen;
 1805                                 struct ip6_pktopts **optp;
 1806 
 1807                                 /* cannot mix with RFC2292 */
 1808                                 if (OPTBIT(IN6P_RFC2292)) {
 1809                                         error = EINVAL;
 1810                                         break;
 1811                                 }
 1812 
 1813                                 /*
 1814                                  * We only ensure valsize is not too large
 1815                                  * here.  Further validation will be done
 1816                                  * later.
 1817                                  */
 1818                                 error = sooptcopyin(sopt, optbuf_storage,
 1819                                     sizeof(optbuf_storage), 0);
 1820                                 if (error)
 1821                                         break;
 1822                                 optlen = sopt->sopt_valsize;
 1823                                 optbuf = optbuf_storage;
 1824                                 optp = &in6p->in6p_outputopts;
 1825                                 error = ip6_pcbopt(optname, optbuf, optlen,
 1826                                     optp, (td != NULL) ? td->td_ucred : NULL,
 1827                                     uproto);
 1828                                 break;
 1829                         }
 1830 #undef OPTSET
 1831 
 1832                         case IPV6_MULTICAST_IF:
 1833                         case IPV6_MULTICAST_HOPS:
 1834                         case IPV6_MULTICAST_LOOP:
 1835                         case IPV6_JOIN_GROUP:
 1836                         case IPV6_LEAVE_GROUP:
 1837                         case IPV6_MSFILTER:
 1838                         case MCAST_BLOCK_SOURCE:
 1839                         case MCAST_UNBLOCK_SOURCE:
 1840                         case MCAST_JOIN_GROUP:
 1841                         case MCAST_LEAVE_GROUP:
 1842                         case MCAST_JOIN_SOURCE_GROUP:
 1843                         case MCAST_LEAVE_SOURCE_GROUP:
 1844                                 error = ip6_setmoptions(in6p, sopt);
 1845                                 break;
 1846 
 1847                         case IPV6_PORTRANGE:
 1848                                 error = sooptcopyin(sopt, &optval,
 1849                                     sizeof optval, sizeof optval);
 1850                                 if (error)
 1851                                         break;
 1852 
 1853                                 INP_WLOCK(in6p);
 1854                                 switch (optval) {
 1855                                 case IPV6_PORTRANGE_DEFAULT:
 1856                                         in6p->inp_flags &= ~(INP_LOWPORT);
 1857                                         in6p->inp_flags &= ~(INP_HIGHPORT);
 1858                                         break;
 1859 
 1860                                 case IPV6_PORTRANGE_HIGH:
 1861                                         in6p->inp_flags &= ~(INP_LOWPORT);
 1862                                         in6p->inp_flags |= INP_HIGHPORT;
 1863                                         break;
 1864 
 1865                                 case IPV6_PORTRANGE_LOW:
 1866                                         in6p->inp_flags &= ~(INP_HIGHPORT);
 1867                                         in6p->inp_flags |= INP_LOWPORT;
 1868                                         break;
 1869 
 1870                                 default:
 1871                                         error = EINVAL;
 1872                                         break;
 1873                                 }
 1874                                 INP_WUNLOCK(in6p);
 1875                                 break;
 1876 
 1877 #ifdef IPSEC
 1878                         case IPV6_IPSEC_POLICY:
 1879                         {
 1880                                 caddr_t req;
 1881                                 struct mbuf *m;
 1882 
 1883                                 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
 1884                                         break;
 1885                                 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
 1886                                         break;
 1887                                 req = mtod(m, caddr_t);
 1888                                 error = ipsec_set_policy(in6p, optname, req,
 1889                                     m->m_len, (sopt->sopt_td != NULL) ?
 1890                                     sopt->sopt_td->td_ucred : NULL);
 1891                                 m_freem(m);
 1892                                 break;
 1893                         }
 1894 #endif /* IPSEC */
 1895 
 1896                         default:
 1897                                 error = ENOPROTOOPT;
 1898                                 break;
 1899                         }
 1900                         break;
 1901 
 1902                 case SOPT_GET:
 1903                         switch (optname) {
 1904 
 1905                         case IPV6_2292PKTOPTIONS:
 1906 #ifdef IPV6_PKTOPTIONS
 1907                         case IPV6_PKTOPTIONS:
 1908 #endif
 1909                                 /*
 1910                                  * RFC3542 (effectively) deprecated the
 1911                                  * semantics of the 2292-style pktoptions.
 1912                                  * Since it was not reliable in nature (i.e.,
 1913                                  * applications had to expect the lack of some
 1914                                  * information after all), it would make sense
 1915                                  * to simplify this part by always returning
 1916                                  * empty data.
 1917                                  */
 1918                                 sopt->sopt_valsize = 0;
 1919                                 break;
 1920 
 1921                         case IPV6_RECVHOPOPTS:
 1922                         case IPV6_RECVDSTOPTS:
 1923                         case IPV6_RECVRTHDRDSTOPTS:
 1924                         case IPV6_UNICAST_HOPS:
 1925                         case IPV6_RECVPKTINFO:
 1926                         case IPV6_RECVHOPLIMIT:
 1927                         case IPV6_RECVRTHDR:
 1928                         case IPV6_RECVPATHMTU:
 1929 
 1930                         case IPV6_FAITH:
 1931                         case IPV6_V6ONLY:
 1932                         case IPV6_PORTRANGE:
 1933                         case IPV6_RECVTCLASS:
 1934                         case IPV6_AUTOFLOWLABEL:
 1935                         case IPV6_BINDANY:
 1936                                 switch (optname) {
 1937 
 1938                                 case IPV6_RECVHOPOPTS:
 1939                                         optval = OPTBIT(IN6P_HOPOPTS);
 1940                                         break;
 1941 
 1942                                 case IPV6_RECVDSTOPTS:
 1943                                         optval = OPTBIT(IN6P_DSTOPTS);
 1944                                         break;
 1945 
 1946                                 case IPV6_RECVRTHDRDSTOPTS:
 1947                                         optval = OPTBIT(IN6P_RTHDRDSTOPTS);
 1948                                         break;
 1949 
 1950                                 case IPV6_UNICAST_HOPS:
 1951                                         optval = in6p->in6p_hops;
 1952                                         break;
 1953 
 1954                                 case IPV6_RECVPKTINFO:
 1955                                         optval = OPTBIT(IN6P_PKTINFO);
 1956                                         break;
 1957 
 1958                                 case IPV6_RECVHOPLIMIT:
 1959                                         optval = OPTBIT(IN6P_HOPLIMIT);
 1960                                         break;
 1961 
 1962                                 case IPV6_RECVRTHDR:
 1963                                         optval = OPTBIT(IN6P_RTHDR);
 1964                                         break;
 1965 
 1966                                 case IPV6_RECVPATHMTU:
 1967                                         optval = OPTBIT(IN6P_MTU);
 1968                                         break;
 1969 
 1970                                 case IPV6_FAITH:
 1971                                         optval = OPTBIT(INP_FAITH);
 1972                                         break;
 1973 
 1974                                 case IPV6_V6ONLY:
 1975                                         optval = OPTBIT(IN6P_IPV6_V6ONLY);
 1976                                         break;
 1977 
 1978                                 case IPV6_PORTRANGE:
 1979                                     {
 1980                                         int flags;
 1981                                         flags = in6p->inp_flags;
 1982                                         if (flags & INP_HIGHPORT)
 1983                                                 optval = IPV6_PORTRANGE_HIGH;
 1984                                         else if (flags & INP_LOWPORT)
 1985                                                 optval = IPV6_PORTRANGE_LOW;
 1986                                         else
 1987                                                 optval = 0;
 1988                                         break;
 1989                                     }
 1990                                 case IPV6_RECVTCLASS:
 1991                                         optval = OPTBIT(IN6P_TCLASS);
 1992                                         break;
 1993 
 1994                                 case IPV6_AUTOFLOWLABEL:
 1995                                         optval = OPTBIT(IN6P_AUTOFLOWLABEL);
 1996                                         break;
 1997 
 1998                                 case IPV6_BINDANY:
 1999                                         optval = OPTBIT(INP_BINDANY);
 2000                                         break;
 2001                                 }
 2002                                 if (error)
 2003                                         break;
 2004                                 error = sooptcopyout(sopt, &optval,
 2005                                         sizeof optval);
 2006                                 break;
 2007 
 2008                         case IPV6_PATHMTU:
 2009                         {
 2010                                 u_long pmtu = 0;
 2011                                 struct ip6_mtuinfo mtuinfo;
 2012                                 struct route_in6 sro;
 2013 
 2014                                 bzero(&sro, sizeof(sro));
 2015 
 2016                                 if (!(so->so_state & SS_ISCONNECTED))
 2017                                         return (ENOTCONN);
 2018                                 /*
 2019                                  * XXX: we dot not consider the case of source
 2020                                  * routing, or optional information to specify
 2021                                  * the outgoing interface.
 2022                                  */
 2023                                 error = ip6_getpmtu(&sro, NULL, NULL,
 2024                                     &in6p->in6p_faddr, &pmtu, NULL,
 2025                                     so->so_fibnum);
 2026                                 if (sro.ro_rt)
 2027                                         RTFREE(sro.ro_rt);
 2028                                 if (error)
 2029                                         break;
 2030                                 if (pmtu > IPV6_MAXPACKET)
 2031                                         pmtu = IPV6_MAXPACKET;
 2032 
 2033                                 bzero(&mtuinfo, sizeof(mtuinfo));
 2034                                 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
 2035                                 optdata = (void *)&mtuinfo;
 2036                                 optdatalen = sizeof(mtuinfo);
 2037                                 error = sooptcopyout(sopt, optdata,
 2038                                     optdatalen);
 2039                                 break;
 2040                         }
 2041 
 2042                         case IPV6_2292PKTINFO:
 2043                         case IPV6_2292HOPLIMIT:
 2044                         case IPV6_2292HOPOPTS:
 2045                         case IPV6_2292RTHDR:
 2046                         case IPV6_2292DSTOPTS:
 2047                                 switch (optname) {
 2048                                 case IPV6_2292PKTINFO:
 2049                                         optval = OPTBIT(IN6P_PKTINFO);
 2050                                         break;
 2051                                 case IPV6_2292HOPLIMIT:
 2052                                         optval = OPTBIT(IN6P_HOPLIMIT);
 2053                                         break;
 2054                                 case IPV6_2292HOPOPTS:
 2055                                         optval = OPTBIT(IN6P_HOPOPTS);
 2056                                         break;
 2057                                 case IPV6_2292RTHDR:
 2058                                         optval = OPTBIT(IN6P_RTHDR);
 2059                                         break;
 2060                                 case IPV6_2292DSTOPTS:
 2061                                         optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
 2062                                         break;
 2063                                 }
 2064                                 error = sooptcopyout(sopt, &optval,
 2065                                     sizeof optval);
 2066                                 break;
 2067                         case IPV6_PKTINFO:
 2068                         case IPV6_HOPOPTS:
 2069                         case IPV6_RTHDR:
 2070                         case IPV6_DSTOPTS:
 2071                         case IPV6_RTHDRDSTOPTS:
 2072                         case IPV6_NEXTHOP:
 2073                         case IPV6_TCLASS:
 2074                         case IPV6_DONTFRAG:
 2075                         case IPV6_USE_MIN_MTU:
 2076                         case IPV6_PREFER_TEMPADDR:
 2077                                 error = ip6_getpcbopt(in6p->in6p_outputopts,
 2078                                     optname, sopt);
 2079                                 break;
 2080 
 2081                         case IPV6_MULTICAST_IF:
 2082                         case IPV6_MULTICAST_HOPS:
 2083                         case IPV6_MULTICAST_LOOP:
 2084                         case IPV6_MSFILTER:
 2085                                 error = ip6_getmoptions(in6p, sopt);
 2086                                 break;
 2087 
 2088 #ifdef IPSEC
 2089                         case IPV6_IPSEC_POLICY:
 2090                           {
 2091                                 caddr_t req = NULL;
 2092                                 size_t len = 0;
 2093                                 struct mbuf *m = NULL;
 2094                                 struct mbuf **mp = &m;
 2095                                 size_t ovalsize = sopt->sopt_valsize;
 2096                                 caddr_t oval = (caddr_t)sopt->sopt_val;
 2097 
 2098                                 error = soopt_getm(sopt, &m); /* XXX */
 2099                                 if (error != 0)
 2100                                         break;
 2101                                 error = soopt_mcopyin(sopt, m); /* XXX */
 2102                                 if (error != 0)
 2103                                         break;
 2104                                 sopt->sopt_valsize = ovalsize;
 2105                                 sopt->sopt_val = oval;
 2106                                 if (m) {
 2107                                         req = mtod(m, caddr_t);
 2108                                         len = m->m_len;
 2109                                 }
 2110                                 error = ipsec_get_policy(in6p, req, len, mp);
 2111                                 if (error == 0)
 2112                                         error = soopt_mcopyout(sopt, m); /* XXX */
 2113                                 if (error == 0 && m)
 2114                                         m_freem(m);
 2115                                 break;
 2116                           }
 2117 #endif /* IPSEC */
 2118 
 2119                         default:
 2120                                 error = ENOPROTOOPT;
 2121                                 break;
 2122                         }
 2123                         break;
 2124                 }
 2125         }
 2126         return (error);
 2127 }
 2128 
 2129 int
 2130 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
 2131 {
 2132         int error = 0, optval, optlen;
 2133         const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
 2134         struct inpcb *in6p = sotoinpcb(so);
 2135         int level, op, optname;
 2136 
 2137         level = sopt->sopt_level;
 2138         op = sopt->sopt_dir;
 2139         optname = sopt->sopt_name;
 2140         optlen = sopt->sopt_valsize;
 2141 
 2142         if (level != IPPROTO_IPV6) {
 2143                 return (EINVAL);
 2144         }
 2145 
 2146         switch (optname) {
 2147         case IPV6_CHECKSUM:
 2148                 /*
 2149                  * For ICMPv6 sockets, no modification allowed for checksum
 2150                  * offset, permit "no change" values to help existing apps.
 2151                  *
 2152                  * RFC3542 says: "An attempt to set IPV6_CHECKSUM
 2153                  * for an ICMPv6 socket will fail."
 2154                  * The current behavior does not meet RFC3542.
 2155                  */
 2156                 switch (op) {
 2157                 case SOPT_SET:
 2158                         if (optlen != sizeof(int)) {
 2159                                 error = EINVAL;
 2160                                 break;
 2161                         }
 2162                         error = sooptcopyin(sopt, &optval, sizeof(optval),
 2163                                             sizeof(optval));
 2164                         if (error)
 2165                                 break;
 2166                         if ((optval % 2) != 0) {
 2167                                 /* the API assumes even offset values */
 2168                                 error = EINVAL;
 2169                         } else if (so->so_proto->pr_protocol ==
 2170                             IPPROTO_ICMPV6) {
 2171                                 if (optval != icmp6off)
 2172                                         error = EINVAL;
 2173                         } else
 2174                                 in6p->in6p_cksum = optval;
 2175                         break;
 2176 
 2177                 case SOPT_GET:
 2178                         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
 2179                                 optval = icmp6off;
 2180                         else
 2181                                 optval = in6p->in6p_cksum;
 2182 
 2183                         error = sooptcopyout(sopt, &optval, sizeof(optval));
 2184                         break;
 2185 
 2186                 default:
 2187                         error = EINVAL;
 2188                         break;
 2189                 }
 2190                 break;
 2191 
 2192         default:
 2193                 error = ENOPROTOOPT;
 2194                 break;
 2195         }
 2196 
 2197         return (error);
 2198 }
 2199 
 2200 /*
 2201  * Set up IP6 options in pcb for insertion in output packets or
 2202  * specifying behavior of outgoing packets.
 2203  */
 2204 static int
 2205 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
 2206     struct socket *so, struct sockopt *sopt)
 2207 {
 2208         struct ip6_pktopts *opt = *pktopt;
 2209         int error = 0;
 2210         struct thread *td = sopt->sopt_td;
 2211 
 2212         /* turn off any old options. */
 2213         if (opt) {
 2214 #ifdef DIAGNOSTIC
 2215                 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
 2216                     opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
 2217                     opt->ip6po_rhinfo.ip6po_rhi_rthdr)
 2218                         printf("ip6_pcbopts: all specified options are cleared.\n");
 2219 #endif
 2220                 ip6_clearpktopts(opt, -1);
 2221         } else
 2222                 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
 2223         *pktopt = NULL;
 2224 
 2225         if (!m || m->m_len == 0) {
 2226                 /*
 2227                  * Only turning off any previous options, regardless of
 2228                  * whether the opt is just created or given.
 2229                  */
 2230                 free(opt, M_IP6OPT);
 2231                 return (0);
 2232         }
 2233 
 2234         /*  set options specified by user. */
 2235         if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
 2236             td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
 2237                 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
 2238                 free(opt, M_IP6OPT);
 2239                 return (error);
 2240         }
 2241         *pktopt = opt;
 2242         return (0);
 2243 }
 2244 
 2245 /*
 2246  * initialize ip6_pktopts.  beware that there are non-zero default values in
 2247  * the struct.
 2248  */
 2249 void
 2250 ip6_initpktopts(struct ip6_pktopts *opt)
 2251 {
 2252 
 2253         bzero(opt, sizeof(*opt));
 2254         opt->ip6po_hlim = -1;   /* -1 means default hop limit */
 2255         opt->ip6po_tclass = -1; /* -1 means default traffic class */
 2256         opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
 2257         opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
 2258 }
 2259 
 2260 static int
 2261 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
 2262     struct ucred *cred, int uproto)
 2263 {
 2264         struct ip6_pktopts *opt;
 2265 
 2266         if (*pktopt == NULL) {
 2267                 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
 2268                     M_WAITOK);
 2269                 ip6_initpktopts(*pktopt);
 2270         }
 2271         opt = *pktopt;
 2272 
 2273         return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
 2274 }
 2275 
 2276 static int
 2277 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
 2278 {
 2279         void *optdata = NULL;
 2280         int optdatalen = 0;
 2281         struct ip6_ext *ip6e;
 2282         int error = 0;
 2283         struct in6_pktinfo null_pktinfo;
 2284         int deftclass = 0, on;
 2285         int defminmtu = IP6PO_MINMTU_MCASTONLY;
 2286         int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
 2287 
 2288         switch (optname) {
 2289         case IPV6_PKTINFO:
 2290                 if (pktopt && pktopt->ip6po_pktinfo)
 2291                         optdata = (void *)pktopt->ip6po_pktinfo;
 2292                 else {
 2293                         /* XXX: we don't have to do this every time... */
 2294                         bzero(&null_pktinfo, sizeof(null_pktinfo));
 2295                         optdata = (void *)&null_pktinfo;
 2296                 }
 2297                 optdatalen = sizeof(struct in6_pktinfo);
 2298                 break;
 2299         case IPV6_TCLASS:
 2300                 if (pktopt && pktopt->ip6po_tclass >= 0)
 2301                         optdata = (void *)&pktopt->ip6po_tclass;
 2302                 else
 2303                         optdata = (void *)&deftclass;
 2304                 optdatalen = sizeof(int);
 2305                 break;
 2306         case IPV6_HOPOPTS:
 2307                 if (pktopt && pktopt->ip6po_hbh) {
 2308                         optdata = (void *)pktopt->ip6po_hbh;
 2309                         ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
 2310                         optdatalen = (ip6e->ip6e_len + 1) << 3;
 2311                 }
 2312                 break;
 2313         case IPV6_RTHDR:
 2314                 if (pktopt && pktopt->ip6po_rthdr) {
 2315                         optdata = (void *)pktopt->ip6po_rthdr;
 2316                         ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
 2317                         optdatalen = (ip6e->ip6e_len + 1) << 3;
 2318                 }
 2319                 break;
 2320         case IPV6_RTHDRDSTOPTS:
 2321                 if (pktopt && pktopt->ip6po_dest1) {
 2322                         optdata = (void *)pktopt->ip6po_dest1;
 2323                         ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
 2324                         optdatalen = (ip6e->ip6e_len + 1) << 3;
 2325                 }
 2326                 break;
 2327         case IPV6_DSTOPTS:
 2328                 if (pktopt && pktopt->ip6po_dest2) {
 2329                         optdata = (void *)pktopt->ip6po_dest2;
 2330                         ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
 2331                         optdatalen = (ip6e->ip6e_len + 1) << 3;
 2332                 }
 2333                 break;
 2334         case IPV6_NEXTHOP:
 2335                 if (pktopt && pktopt->ip6po_nexthop) {
 2336                         optdata = (void *)pktopt->ip6po_nexthop;
 2337                         optdatalen = pktopt->ip6po_nexthop->sa_len;
 2338                 }
 2339                 break;
 2340         case IPV6_USE_MIN_MTU:
 2341                 if (pktopt)
 2342                         optdata = (void *)&pktopt->ip6po_minmtu;
 2343                 else
 2344                         optdata = (void *)&defminmtu;
 2345                 optdatalen = sizeof(int);
 2346                 break;
 2347         case IPV6_DONTFRAG:
 2348                 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
 2349                         on = 1;
 2350                 else
 2351                         on = 0;
 2352                 optdata = (void *)&on;
 2353                 optdatalen = sizeof(on);
 2354                 break;
 2355         case IPV6_PREFER_TEMPADDR:
 2356                 if (pktopt)
 2357                         optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
 2358                 else
 2359                         optdata = (void *)&defpreftemp;
 2360                 optdatalen = sizeof(int);
 2361                 break;
 2362         default:                /* should not happen */
 2363 #ifdef DIAGNOSTIC
 2364                 panic("ip6_getpcbopt: unexpected option\n");
 2365 #endif
 2366                 return (ENOPROTOOPT);
 2367         }
 2368 
 2369         error = sooptcopyout(sopt, optdata, optdatalen);
 2370 
 2371         return (error);
 2372 }
 2373 
 2374 void
 2375 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
 2376 {
 2377         if (pktopt == NULL)
 2378                 return;
 2379 
 2380         if (optname == -1 || optname == IPV6_PKTINFO) {
 2381                 if (pktopt->ip6po_pktinfo)
 2382                         free(pktopt->ip6po_pktinfo, M_IP6OPT);
 2383                 pktopt->ip6po_pktinfo = NULL;
 2384         }
 2385         if (optname == -1 || optname == IPV6_HOPLIMIT)
 2386                 pktopt->ip6po_hlim = -1;
 2387         if (optname == -1 || optname == IPV6_TCLASS)
 2388                 pktopt->ip6po_tclass = -1;
 2389         if (optname == -1 || optname == IPV6_NEXTHOP) {
 2390                 if (pktopt->ip6po_nextroute.ro_rt) {
 2391                         RTFREE(pktopt->ip6po_nextroute.ro_rt);
 2392                         pktopt->ip6po_nextroute.ro_rt = NULL;
 2393                 }
 2394                 if (pktopt->ip6po_nexthop)
 2395                         free(pktopt->ip6po_nexthop, M_IP6OPT);
 2396                 pktopt->ip6po_nexthop = NULL;
 2397         }
 2398         if (optname == -1 || optname == IPV6_HOPOPTS) {
 2399                 if (pktopt->ip6po_hbh)
 2400                         free(pktopt->ip6po_hbh, M_IP6OPT);
 2401                 pktopt->ip6po_hbh = NULL;
 2402         }
 2403         if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
 2404                 if (pktopt->ip6po_dest1)
 2405                         free(pktopt->ip6po_dest1, M_IP6OPT);
 2406                 pktopt->ip6po_dest1 = NULL;
 2407         }
 2408         if (optname == -1 || optname == IPV6_RTHDR) {
 2409                 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
 2410                         free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
 2411                 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
 2412                 if (pktopt->ip6po_route.ro_rt) {
 2413                         RTFREE(pktopt->ip6po_route.ro_rt);
 2414                         pktopt->ip6po_route.ro_rt = NULL;
 2415                 }
 2416         }
 2417         if (optname == -1 || optname == IPV6_DSTOPTS) {
 2418                 if (pktopt->ip6po_dest2)
 2419                         free(pktopt->ip6po_dest2, M_IP6OPT);
 2420                 pktopt->ip6po_dest2 = NULL;
 2421         }
 2422 }
 2423 
 2424 #define PKTOPT_EXTHDRCPY(type) \
 2425 do {\
 2426         if (src->type) {\
 2427                 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
 2428                 dst->type = malloc(hlen, M_IP6OPT, canwait);\
 2429                 if (dst->type == NULL && canwait == M_NOWAIT)\
 2430                         goto bad;\
 2431                 bcopy(src->type, dst->type, hlen);\
 2432         }\
 2433 } while (/*CONSTCOND*/ 0)
 2434 
 2435 static int
 2436 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
 2437 {
 2438         if (dst == NULL || src == NULL)  {
 2439                 printf("ip6_clearpktopts: invalid argument\n");
 2440                 return (EINVAL);
 2441         }
 2442 
 2443         dst->ip6po_hlim = src->ip6po_hlim;
 2444         dst->ip6po_tclass = src->ip6po_tclass;
 2445         dst->ip6po_flags = src->ip6po_flags;
 2446         dst->ip6po_minmtu = src->ip6po_minmtu;
 2447         dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
 2448         if (src->ip6po_pktinfo) {
 2449                 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
 2450                     M_IP6OPT, canwait);
 2451                 if (dst->ip6po_pktinfo == NULL)
 2452                         goto bad;
 2453                 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
 2454         }
 2455         if (src->ip6po_nexthop) {
 2456                 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
 2457                     M_IP6OPT, canwait);
 2458                 if (dst->ip6po_nexthop == NULL)
 2459                         goto bad;
 2460                 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
 2461                     src->ip6po_nexthop->sa_len);
 2462         }
 2463         PKTOPT_EXTHDRCPY(ip6po_hbh);
 2464         PKTOPT_EXTHDRCPY(ip6po_dest1);
 2465         PKTOPT_EXTHDRCPY(ip6po_dest2);
 2466         PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
 2467         return (0);
 2468 
 2469   bad:
 2470         ip6_clearpktopts(dst, -1);
 2471         return (ENOBUFS);
 2472 }
 2473 #undef PKTOPT_EXTHDRCPY
 2474 
 2475 struct ip6_pktopts *
 2476 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
 2477 {
 2478         int error;
 2479         struct ip6_pktopts *dst;
 2480 
 2481         dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
 2482         if (dst == NULL)
 2483                 return (NULL);
 2484         ip6_initpktopts(dst);
 2485 
 2486         if ((error = copypktopts(dst, src, canwait)) != 0) {
 2487                 free(dst, M_IP6OPT);
 2488                 return (NULL);
 2489         }
 2490 
 2491         return (dst);
 2492 }
 2493 
 2494 void
 2495 ip6_freepcbopts(struct ip6_pktopts *pktopt)
 2496 {
 2497         if (pktopt == NULL)
 2498                 return;
 2499 
 2500         ip6_clearpktopts(pktopt, -1);
 2501 
 2502         free(pktopt, M_IP6OPT);
 2503 }
 2504 
 2505 /*
 2506  * Set IPv6 outgoing packet options based on advanced API.
 2507  */
 2508 int
 2509 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
 2510     struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
 2511 {
 2512         struct cmsghdr *cm = 0;
 2513 
 2514         if (control == NULL || opt == NULL)
 2515                 return (EINVAL);
 2516 
 2517         ip6_initpktopts(opt);
 2518         if (stickyopt) {
 2519                 int error;
 2520 
 2521                 /*
 2522                  * If stickyopt is provided, make a local copy of the options
 2523                  * for this particular packet, then override them by ancillary
 2524                  * objects.
 2525                  * XXX: copypktopts() does not copy the cached route to a next
 2526                  * hop (if any).  This is not very good in terms of efficiency,
 2527                  * but we can allow this since this option should be rarely
 2528                  * used.
 2529                  */
 2530                 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
 2531                         return (error);
 2532         }
 2533 
 2534         /*
 2535          * XXX: Currently, we assume all the optional information is stored
 2536          * in a single mbuf.
 2537          */
 2538         if (control->m_next)
 2539                 return (EINVAL);
 2540 
 2541         for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
 2542             control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
 2543                 int error;
 2544 
 2545                 if (control->m_len < CMSG_LEN(0))
 2546                         return (EINVAL);
 2547 
 2548                 cm = mtod(control, struct cmsghdr *);
 2549                 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
 2550                         return (EINVAL);
 2551                 if (cm->cmsg_level != IPPROTO_IPV6)
 2552                         continue;
 2553 
 2554                 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
 2555                     cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
 2556                 if (error)
 2557                         return (error);
 2558         }
 2559 
 2560         return (0);
 2561 }
 2562 
 2563 /*
 2564  * Set a particular packet option, as a sticky option or an ancillary data
 2565  * item.  "len" can be 0 only when it's a sticky option.
 2566  * We have 4 cases of combination of "sticky" and "cmsg":
 2567  * "sticky=0, cmsg=0": impossible
 2568  * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
 2569  * "sticky=1, cmsg=0": RFC3542 socket option
 2570  * "sticky=1, cmsg=1": RFC2292 socket option
 2571  */
 2572 static int
 2573 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
 2574     struct ucred *cred, int sticky, int cmsg, int uproto)
 2575 {
 2576         int minmtupolicy, preftemp;
 2577         int error;
 2578 
 2579         if (!sticky && !cmsg) {
 2580 #ifdef DIAGNOSTIC
 2581                 printf("ip6_setpktopt: impossible case\n");
 2582 #endif
 2583                 return (EINVAL);
 2584         }
 2585 
 2586         /*
 2587          * IPV6_2292xxx is for backward compatibility to RFC2292, and should
 2588          * not be specified in the context of RFC3542.  Conversely,
 2589          * RFC3542 types should not be specified in the context of RFC2292.
 2590          */
 2591         if (!cmsg) {
 2592                 switch (optname) {
 2593                 case IPV6_2292PKTINFO:
 2594                 case IPV6_2292HOPLIMIT:
 2595                 case IPV6_2292NEXTHOP:
 2596                 case IPV6_2292HOPOPTS:
 2597                 case IPV6_2292DSTOPTS:
 2598                 case IPV6_2292RTHDR:
 2599                 case IPV6_2292PKTOPTIONS:
 2600                         return (ENOPROTOOPT);
 2601                 }
 2602         }
 2603         if (sticky && cmsg) {
 2604                 switch (optname) {
 2605                 case IPV6_PKTINFO:
 2606                 case IPV6_HOPLIMIT:
 2607                 case IPV6_NEXTHOP:
 2608                 case IPV6_HOPOPTS:
 2609                 case IPV6_DSTOPTS:
 2610                 case IPV6_RTHDRDSTOPTS:
 2611                 case IPV6_RTHDR:
 2612                 case IPV6_USE_MIN_MTU:
 2613                 case IPV6_DONTFRAG:
 2614                 case IPV6_TCLASS:
 2615                 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
 2616                         return (ENOPROTOOPT);
 2617                 }
 2618         }
 2619 
 2620         switch (optname) {
 2621         case IPV6_2292PKTINFO:
 2622         case IPV6_PKTINFO:
 2623         {
 2624                 struct ifnet *ifp = NULL;
 2625                 struct in6_pktinfo *pktinfo;
 2626 
 2627                 if (len != sizeof(struct in6_pktinfo))
 2628                         return (EINVAL);
 2629 
 2630                 pktinfo = (struct in6_pktinfo *)buf;
 2631 
 2632                 /*
 2633                  * An application can clear any sticky IPV6_PKTINFO option by
 2634                  * doing a "regular" setsockopt with ipi6_addr being
 2635                  * in6addr_any and ipi6_ifindex being zero.
 2636                  * [RFC 3542, Section 6]
 2637                  */
 2638                 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
 2639                     pktinfo->ipi6_ifindex == 0 &&
 2640                     IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
 2641                         ip6_clearpktopts(opt, optname);
 2642                         break;
 2643                 }
 2644 
 2645                 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
 2646                     sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
 2647                         return (EINVAL);
 2648                 }
 2649 
 2650                 /* validate the interface index if specified. */
 2651                 if (pktinfo->ipi6_ifindex > V_if_index ||
 2652                     pktinfo->ipi6_ifindex < 0) {
 2653                          return (ENXIO);
 2654                 }
 2655                 if (pktinfo->ipi6_ifindex) {
 2656                         ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
 2657                         if (ifp == NULL)
 2658                                 return (ENXIO);
 2659                 }
 2660 
 2661                 /*
 2662                  * We store the address anyway, and let in6_selectsrc()
 2663                  * validate the specified address.  This is because ipi6_addr
 2664                  * may not have enough information about its scope zone, and
 2665                  * we may need additional information (such as outgoing
 2666                  * interface or the scope zone of a destination address) to
 2667                  * disambiguate the scope.
 2668                  * XXX: the delay of the validation may confuse the
 2669                  * application when it is used as a sticky option.
 2670                  */
 2671                 if (opt->ip6po_pktinfo == NULL) {
 2672                         opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
 2673                             M_IP6OPT, M_NOWAIT);
 2674                         if (opt->ip6po_pktinfo == NULL)
 2675                                 return (ENOBUFS);
 2676                 }
 2677                 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
 2678                 break;
 2679         }
 2680 
 2681         case IPV6_2292HOPLIMIT:
 2682         case IPV6_HOPLIMIT:
 2683         {
 2684                 int *hlimp;
 2685 
 2686                 /*
 2687                  * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
 2688                  * to simplify the ordering among hoplimit options.
 2689                  */
 2690                 if (optname == IPV6_HOPLIMIT && sticky)
 2691                         return (ENOPROTOOPT);
 2692 
 2693                 if (len != sizeof(int))
 2694                         return (EINVAL);
 2695                 hlimp = (int *)buf;
 2696                 if (*hlimp < -1 || *hlimp > 255)
 2697                         return (EINVAL);
 2698 
 2699                 opt->ip6po_hlim = *hlimp;
 2700                 break;
 2701         }
 2702 
 2703         case IPV6_TCLASS:
 2704         {
 2705                 int tclass;
 2706 
 2707                 if (len != sizeof(int))
 2708                         return (EINVAL);
 2709                 tclass = *(int *)buf;
 2710                 if (tclass < -1 || tclass > 255)
 2711                         return (EINVAL);
 2712 
 2713                 opt->ip6po_tclass = tclass;
 2714                 break;
 2715         }
 2716 
 2717         case IPV6_2292NEXTHOP:
 2718         case IPV6_NEXTHOP:
 2719                 if (cred != NULL) {
 2720                         error = priv_check_cred(cred,
 2721                             PRIV_NETINET_SETHDROPTS, 0);
 2722                         if (error)
 2723                                 return (error);
 2724                 }
 2725 
 2726                 if (len == 0) { /* just remove the option */
 2727                         ip6_clearpktopts(opt, IPV6_NEXTHOP);
 2728                         break;
 2729                 }
 2730 
 2731                 /* check if cmsg_len is large enough for sa_len */
 2732                 if (len < sizeof(struct sockaddr) || len < *buf)
 2733                         return (EINVAL);
 2734 
 2735                 switch (((struct sockaddr *)buf)->sa_family) {
 2736                 case AF_INET6:
 2737                 {
 2738                         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
 2739                         int error;
 2740 
 2741                         if (sa6->sin6_len != sizeof(struct sockaddr_in6))
 2742                                 return (EINVAL);
 2743 
 2744                         if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
 2745                             IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
 2746                                 return (EINVAL);
 2747                         }
 2748                         if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
 2749                             != 0) {
 2750                                 return (error);
 2751                         }
 2752                         break;
 2753                 }
 2754                 case AF_LINK:   /* should eventually be supported */
 2755                 default:
 2756                         return (EAFNOSUPPORT);
 2757                 }
 2758 
 2759                 /* turn off the previous option, then set the new option. */
 2760                 ip6_clearpktopts(opt, IPV6_NEXTHOP);
 2761                 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
 2762                 if (opt->ip6po_nexthop == NULL)
 2763                         return (ENOBUFS);
 2764                 bcopy(buf, opt->ip6po_nexthop, *buf);
 2765                 break;
 2766 
 2767         case IPV6_2292HOPOPTS:
 2768         case IPV6_HOPOPTS:
 2769         {
 2770                 struct ip6_hbh *hbh;
 2771                 int hbhlen;
 2772 
 2773                 /*
 2774                  * XXX: We don't allow a non-privileged user to set ANY HbH
 2775                  * options, since per-option restriction has too much
 2776                  * overhead.
 2777                  */
 2778                 if (cred != NULL) {
 2779                         error = priv_check_cred(cred,
 2780                             PRIV_NETINET_SETHDROPTS, 0);
 2781                         if (error)
 2782                                 return (error);
 2783                 }
 2784 
 2785                 if (len == 0) {
 2786                         ip6_clearpktopts(opt, IPV6_HOPOPTS);
 2787                         break;  /* just remove the option */
 2788                 }
 2789 
 2790                 /* message length validation */
 2791                 if (len < sizeof(struct ip6_hbh))
 2792                         return (EINVAL);
 2793                 hbh = (struct ip6_hbh *)buf;
 2794                 hbhlen = (hbh->ip6h_len + 1) << 3;
 2795                 if (len != hbhlen)
 2796                         return (EINVAL);
 2797 
 2798                 /* turn off the previous option, then set the new option. */
 2799                 ip6_clearpktopts(opt, IPV6_HOPOPTS);
 2800                 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
 2801                 if (opt->ip6po_hbh == NULL)
 2802                         return (ENOBUFS);
 2803                 bcopy(hbh, opt->ip6po_hbh, hbhlen);
 2804 
 2805                 break;
 2806         }
 2807 
 2808         case IPV6_2292DSTOPTS:
 2809         case IPV6_DSTOPTS:
 2810         case IPV6_RTHDRDSTOPTS:
 2811         {
 2812                 struct ip6_dest *dest, **newdest = NULL;
 2813                 int destlen;
 2814 
 2815                 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
 2816                         error = priv_check_cred(cred,
 2817                             PRIV_NETINET_SETHDROPTS, 0);
 2818                         if (error)
 2819                                 return (error);
 2820                 }
 2821 
 2822                 if (len == 0) {
 2823                         ip6_clearpktopts(opt, optname);
 2824                         break;  /* just remove the option */
 2825                 }
 2826 
 2827                 /* message length validation */
 2828                 if (len < sizeof(struct ip6_dest))
 2829                         return (EINVAL);
 2830                 dest = (struct ip6_dest *)buf;
 2831                 destlen = (dest->ip6d_len + 1) << 3;
 2832                 if (len != destlen)
 2833                         return (EINVAL);
 2834 
 2835                 /*
 2836                  * Determine the position that the destination options header
 2837                  * should be inserted; before or after the routing header.
 2838                  */
 2839                 switch (optname) {
 2840                 case IPV6_2292DSTOPTS:
 2841                         /*
 2842                          * The old advacned API is ambiguous on this point.
 2843                          * Our approach is to determine the position based
 2844                          * according to the existence of a routing header.
 2845                          * Note, however, that this depends on the order of the
 2846                          * extension headers in the ancillary data; the 1st
 2847                          * part of the destination options header must appear
 2848                          * before the routing header in the ancillary data,
 2849                          * too.
 2850                          * RFC3542 solved the ambiguity by introducing
 2851                          * separate ancillary data or option types.
 2852                          */
 2853                         if (opt->ip6po_rthdr == NULL)
 2854                                 newdest = &opt->ip6po_dest1;
 2855                         else
 2856                                 newdest = &opt->ip6po_dest2;
 2857                         break;
 2858                 case IPV6_RTHDRDSTOPTS:
 2859                         newdest = &opt->ip6po_dest1;
 2860                         break;
 2861                 case IPV6_DSTOPTS:
 2862                         newdest = &opt->ip6po_dest2;
 2863                         break;
 2864                 }
 2865 
 2866                 /* turn off the previous option, then set the new option. */
 2867                 ip6_clearpktopts(opt, optname);
 2868                 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
 2869                 if (*newdest == NULL)
 2870                         return (ENOBUFS);
 2871                 bcopy(dest, *newdest, destlen);
 2872 
 2873                 break;
 2874         }
 2875 
 2876         case IPV6_2292RTHDR:
 2877         case IPV6_RTHDR:
 2878         {
 2879                 struct ip6_rthdr *rth;
 2880                 int rthlen;
 2881 
 2882                 if (len == 0) {
 2883                         ip6_clearpktopts(opt, IPV6_RTHDR);
 2884                         break;  /* just remove the option */
 2885                 }
 2886 
 2887                 /* message length validation */
 2888                 if (len < sizeof(struct ip6_rthdr))
 2889                         return (EINVAL);
 2890                 rth = (struct ip6_rthdr *)buf;
 2891                 rthlen = (rth->ip6r_len + 1) << 3;
 2892                 if (len != rthlen)
 2893                         return (EINVAL);
 2894 
 2895                 switch (rth->ip6r_type) {
 2896                 case IPV6_RTHDR_TYPE_0:
 2897                         if (rth->ip6r_len == 0) /* must contain one addr */
 2898                                 return (EINVAL);
 2899                         if (rth->ip6r_len % 2) /* length must be even */
 2900                                 return (EINVAL);
 2901                         if (rth->ip6r_len / 2 != rth->ip6r_segleft)
 2902                                 return (EINVAL);
 2903                         break;
 2904                 default:
 2905                         return (EINVAL);        /* not supported */
 2906                 }
 2907 
 2908                 /* turn off the previous option */
 2909                 ip6_clearpktopts(opt, IPV6_RTHDR);
 2910                 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
 2911                 if (opt->ip6po_rthdr == NULL)
 2912                         return (ENOBUFS);
 2913                 bcopy(rth, opt->ip6po_rthdr, rthlen);
 2914 
 2915                 break;
 2916         }
 2917 
 2918         case IPV6_USE_MIN_MTU:
 2919                 if (len != sizeof(int))
 2920                         return (EINVAL);
 2921                 minmtupolicy = *(int *)buf;
 2922                 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
 2923                     minmtupolicy != IP6PO_MINMTU_DISABLE &&
 2924                     minmtupolicy != IP6PO_MINMTU_ALL) {
 2925                         return (EINVAL);
 2926                 }
 2927                 opt->ip6po_minmtu = minmtupolicy;
 2928                 break;
 2929 
 2930         case IPV6_DONTFRAG:
 2931                 if (len != sizeof(int))
 2932                         return (EINVAL);
 2933 
 2934                 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
 2935                         /*
 2936                          * we ignore this option for TCP sockets.
 2937                          * (RFC3542 leaves this case unspecified.)
 2938                          */
 2939                         opt->ip6po_flags &= ~IP6PO_DONTFRAG;
 2940                 } else
 2941                         opt->ip6po_flags |= IP6PO_DONTFRAG;
 2942                 break;
 2943 
 2944         case IPV6_PREFER_TEMPADDR:
 2945                 if (len != sizeof(int))
 2946                         return (EINVAL);
 2947                 preftemp = *(int *)buf;
 2948                 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
 2949                     preftemp != IP6PO_TEMPADDR_NOTPREFER &&
 2950                     preftemp != IP6PO_TEMPADDR_PREFER) {
 2951                         return (EINVAL);
 2952                 }
 2953                 opt->ip6po_prefer_tempaddr = preftemp;
 2954                 break;
 2955 
 2956         default:
 2957                 return (ENOPROTOOPT);
 2958         } /* end of switch */
 2959 
 2960         return (0);
 2961 }
 2962 
 2963 /*
 2964  * Routine called from ip6_output() to loop back a copy of an IP6 multicast
 2965  * packet to the input queue of a specified interface.  Note that this
 2966  * calls the output routine of the loopback "driver", but with an interface
 2967  * pointer that might NOT be &loif -- easier than replicating that code here.
 2968  */
 2969 void
 2970 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst)
 2971 {
 2972         struct mbuf *copym;
 2973         struct ip6_hdr *ip6;
 2974 
 2975         copym = m_copy(m, 0, M_COPYALL);
 2976         if (copym == NULL)
 2977                 return;
 2978 
 2979         /*
 2980          * Make sure to deep-copy IPv6 header portion in case the data
 2981          * is in an mbuf cluster, so that we can safely override the IPv6
 2982          * header portion later.
 2983          */
 2984         if ((copym->m_flags & M_EXT) != 0 ||
 2985             copym->m_len < sizeof(struct ip6_hdr)) {
 2986                 copym = m_pullup(copym, sizeof(struct ip6_hdr));
 2987                 if (copym == NULL)
 2988                         return;
 2989         }
 2990 
 2991 #ifdef DIAGNOSTIC
 2992         if (copym->m_len < sizeof(*ip6)) {
 2993                 m_freem(copym);
 2994                 return;
 2995         }
 2996 #endif
 2997 
 2998         ip6 = mtod(copym, struct ip6_hdr *);
 2999         /*
 3000          * clear embedded scope identifiers if necessary.
 3001          * in6_clearscope will touch the addresses only when necessary.
 3002          */
 3003         in6_clearscope(&ip6->ip6_src);
 3004         in6_clearscope(&ip6->ip6_dst);
 3005 
 3006         (void)if_simloop(ifp, copym, dst->sin6_family, 0);
 3007 }
 3008 
 3009 /*
 3010  * Chop IPv6 header off from the payload.
 3011  */
 3012 static int
 3013 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
 3014 {
 3015         struct mbuf *mh;
 3016         struct ip6_hdr *ip6;
 3017 
 3018         ip6 = mtod(m, struct ip6_hdr *);
 3019         if (m->m_len > sizeof(*ip6)) {
 3020                 mh = m_gethdr(M_NOWAIT, MT_DATA);
 3021                 if (mh == NULL) {
 3022                         m_freem(m);
 3023                         return ENOBUFS;
 3024                 }
 3025                 m_move_pkthdr(mh, m);
 3026                 MH_ALIGN(mh, sizeof(*ip6));
 3027                 m->m_len -= sizeof(*ip6);
 3028                 m->m_data += sizeof(*ip6);
 3029                 mh->m_next = m;
 3030                 m = mh;
 3031                 m->m_len = sizeof(*ip6);
 3032                 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
 3033         }
 3034         exthdrs->ip6e_ip6 = m;
 3035         return 0;
 3036 }
 3037 
 3038 /*
 3039  * Compute IPv6 extension header length.
 3040  */
 3041 int
 3042 ip6_optlen(struct inpcb *in6p)
 3043 {
 3044         int len;
 3045 
 3046         if (!in6p->in6p_outputopts)
 3047                 return 0;
 3048 
 3049         len = 0;
 3050 #define elen(x) \
 3051     (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
 3052 
 3053         len += elen(in6p->in6p_outputopts->ip6po_hbh);
 3054         if (in6p->in6p_outputopts->ip6po_rthdr)
 3055                 /* dest1 is valid with rthdr only */
 3056                 len += elen(in6p->in6p_outputopts->ip6po_dest1);
 3057         len += elen(in6p->in6p_outputopts->ip6po_rthdr);
 3058         len += elen(in6p->in6p_outputopts->ip6po_dest2);
 3059         return len;
 3060 #undef elen
 3061 }

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