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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the project nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $
   32  */
   33 
   34 /*-
   35  * Copyright (c) 1982, 1986, 1988, 1990, 1993
   36  *      The Regents of the University of California.  All rights reserved.
   37  *
   38  * Redistribution and use in source and binary forms, with or without
   39  * modification, are permitted provided that the following conditions
   40  * are met:
   41  * 1. Redistributions of source code must retain the above copyright
   42  *    notice, this list of conditions and the following disclaimer.
   43  * 2. Redistributions in binary form must reproduce the above copyright
   44  *    notice, this list of conditions and the following disclaimer in the
   45  *    documentation and/or other materials provided with the distribution.
   46  * 3. Neither the name of the University nor the names of its contributors
   47  *    may be used to endorse or promote products derived from this software
   48  *    without specific prior written permission.
   49  *
   50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   60  * SUCH DAMAGE.
   61  *
   62  *      @(#)ip_output.c 8.3 (Berkeley) 1/21/94
   63  */
   64 
   65 #include <sys/cdefs.h>
   66 __FBSDID("$FreeBSD: releng/12.0/sys/netinet6/ip6_output.c 338450 2018-09-03 22:27:27Z bz $");
   67 
   68 #include "opt_inet.h"
   69 #include "opt_inet6.h"
   70 #include "opt_ratelimit.h"
   71 #include "opt_ipsec.h"
   72 #include "opt_sctp.h"
   73 #include "opt_route.h"
   74 #include "opt_rss.h"
   75 
   76 #include <sys/param.h>
   77 #include <sys/kernel.h>
   78 #include <sys/malloc.h>
   79 #include <sys/mbuf.h>
   80 #include <sys/errno.h>
   81 #include <sys/priv.h>
   82 #include <sys/proc.h>
   83 #include <sys/protosw.h>
   84 #include <sys/socket.h>
   85 #include <sys/socketvar.h>
   86 #include <sys/syslog.h>
   87 #include <sys/ucred.h>
   88 
   89 #include <machine/in_cksum.h>
   90 
   91 #include <net/if.h>
   92 #include <net/if_var.h>
   93 #include <net/if_llatbl.h>
   94 #include <net/netisr.h>
   95 #include <net/route.h>
   96 #include <net/pfil.h>
   97 #include <net/rss_config.h>
   98 #include <net/vnet.h>
   99 
  100 #include <netinet/in.h>
  101 #include <netinet/in_var.h>
  102 #include <netinet/ip_var.h>
  103 #include <netinet6/in6_fib.h>
  104 #include <netinet6/in6_var.h>
  105 #include <netinet/ip6.h>
  106 #include <netinet/icmp6.h>
  107 #include <netinet6/ip6_var.h>
  108 #include <netinet/in_pcb.h>
  109 #include <netinet/tcp_var.h>
  110 #include <netinet6/nd6.h>
  111 #include <netinet6/in6_rss.h>
  112 
  113 #include <netipsec/ipsec_support.h>
  114 #ifdef SCTP
  115 #include <netinet/sctp.h>
  116 #include <netinet/sctp_crc32.h>
  117 #endif
  118 
  119 #include <netinet6/ip6protosw.h>
  120 #include <netinet6/scope6_var.h>
  121 
  122 extern int in6_mcast_loop;
  123 
  124 struct ip6_exthdrs {
  125         struct mbuf *ip6e_ip6;
  126         struct mbuf *ip6e_hbh;
  127         struct mbuf *ip6e_dest1;
  128         struct mbuf *ip6e_rthdr;
  129         struct mbuf *ip6e_dest2;
  130 };
  131 
  132 static MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
  133 
  134 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
  135                            struct ucred *, int);
  136 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
  137         struct socket *, struct sockopt *);
  138 static int ip6_getpcbopt(struct inpcb *, int, struct sockopt *);
  139 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
  140         struct ucred *, int, int, int);
  141 
  142 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
  143 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
  144         struct ip6_frag **);
  145 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
  146 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
  147 static int ip6_getpmtu(struct route_in6 *, int,
  148         struct ifnet *, const struct in6_addr *, u_long *, int *, u_int,
  149         u_int);
  150 static int ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long,
  151         u_long *, int *, u_int);
  152 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *);
  153 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
  154 
  155 
  156 /*
  157  * Make an extension header from option data.  hp is the source, and
  158  * mp is the destination.
  159  */
  160 #define MAKE_EXTHDR(hp, mp)                                             \
  161     do {                                                                \
  162         if (hp) {                                                       \
  163                 struct ip6_ext *eh = (struct ip6_ext *)(hp);            \
  164                 error = ip6_copyexthdr((mp), (caddr_t)(hp),             \
  165                     ((eh)->ip6e_len + 1) << 3);                         \
  166                 if (error)                                              \
  167                         goto freehdrs;                                  \
  168         }                                                               \
  169     } while (/*CONSTCOND*/ 0)
  170 
  171 /*
  172  * Form a chain of extension headers.
  173  * m is the extension header mbuf
  174  * mp is the previous mbuf in the chain
  175  * p is the next header
  176  * i is the type of option.
  177  */
  178 #define MAKE_CHAIN(m, mp, p, i)\
  179     do {\
  180         if (m) {\
  181                 if (!hdrsplit) \
  182                         panic("assumption failed: hdr not split"); \
  183                 *mtod((m), u_char *) = *(p);\
  184                 *(p) = (i);\
  185                 p = mtod((m), u_char *);\
  186                 (m)->m_next = (mp)->m_next;\
  187                 (mp)->m_next = (m);\
  188                 (mp) = (m);\
  189         }\
  190     } while (/*CONSTCOND*/ 0)
  191 
  192 void
  193 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
  194 {
  195         u_short csum;
  196 
  197         csum = in_cksum_skip(m, offset + plen, offset);
  198         if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
  199                 csum = 0xffff;
  200         offset += m->m_pkthdr.csum_data;        /* checksum offset */
  201 
  202         if (offset + sizeof(csum) > m->m_len)
  203                 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
  204         else
  205                 *(u_short *)mtodo(m, offset) = csum;
  206 }
  207 
  208 int
  209 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto,
  210     int fraglen , uint32_t id)
  211 {
  212         struct mbuf *m, **mnext, *m_frgpart;
  213         struct ip6_hdr *ip6, *mhip6;
  214         struct ip6_frag *ip6f;
  215         int off;
  216         int error;
  217         int tlen = m0->m_pkthdr.len;
  218 
  219         KASSERT((fraglen % 8 == 0), ("Fragment length must be a multiple of 8"));
  220 
  221         m = m0;
  222         ip6 = mtod(m, struct ip6_hdr *);
  223         mnext = &m->m_nextpkt;
  224 
  225         for (off = hlen; off < tlen; off += fraglen) {
  226                 m = m_gethdr(M_NOWAIT, MT_DATA);
  227                 if (!m) {
  228                         IP6STAT_INC(ip6s_odropped);
  229                         return (ENOBUFS);
  230                 }
  231                 m->m_flags = m0->m_flags & M_COPYFLAGS;
  232                 *mnext = m;
  233                 mnext = &m->m_nextpkt;
  234                 m->m_data += max_linkhdr;
  235                 mhip6 = mtod(m, struct ip6_hdr *);
  236                 *mhip6 = *ip6;
  237                 m->m_len = sizeof(*mhip6);
  238                 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
  239                 if (error) {
  240                         IP6STAT_INC(ip6s_odropped);
  241                         return (error);
  242                 }
  243                 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
  244                 if (off + fraglen >= tlen)
  245                         fraglen = tlen - off;
  246                 else
  247                         ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
  248                 mhip6->ip6_plen = htons((u_short)(fraglen + hlen +
  249                     sizeof(*ip6f) - sizeof(struct ip6_hdr)));
  250                 if ((m_frgpart = m_copym(m0, off, fraglen, M_NOWAIT)) == NULL) {
  251                         IP6STAT_INC(ip6s_odropped);
  252                         return (ENOBUFS);
  253                 }
  254                 m_cat(m, m_frgpart);
  255                 m->m_pkthdr.len = fraglen + hlen + sizeof(*ip6f);
  256                 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
  257                 m->m_pkthdr.rcvif = NULL;
  258                 ip6f->ip6f_reserved = 0;
  259                 ip6f->ip6f_ident = id;
  260                 ip6f->ip6f_nxt = nextproto;
  261                 IP6STAT_INC(ip6s_ofragments);
  262                 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
  263         }
  264 
  265         return (0);
  266 }
  267 
  268 /*
  269  * IP6 output. The packet in mbuf chain m contains a skeletal IP6
  270  * header (with pri, len, nxt, hlim, src, dst).
  271  * This function may modify ver and hlim only.
  272  * The mbuf chain containing the packet will be freed.
  273  * The mbuf opt, if present, will not be freed.
  274  * If route_in6 ro is present and has ro_rt initialized, route lookup would be
  275  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
  276  * then result of route lookup is stored in ro->ro_rt.
  277  *
  278  * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and
  279  * nd_ifinfo.linkmtu is u_int32_t.  so we use u_long to hold largest one,
  280  * which is rt_mtu.
  281  *
  282  * ifpp - XXX: just for statistics
  283  */
  284 /*
  285  * XXX TODO: no flowid is assigned for outbound flows?
  286  */
  287 int
  288 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
  289     struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
  290     struct ifnet **ifpp, struct inpcb *inp)
  291 {
  292         struct ip6_hdr *ip6;
  293         struct ifnet *ifp, *origifp;
  294         struct mbuf *m = m0;
  295         struct mbuf *mprev = NULL;
  296         int hlen, tlen, len;
  297         struct route_in6 ip6route;
  298         struct rtentry *rt = NULL;
  299         struct sockaddr_in6 *dst, src_sa, dst_sa;
  300         struct in6_addr odst;
  301         int error = 0;
  302         struct in6_ifaddr *ia = NULL;
  303         u_long mtu;
  304         int alwaysfrag, dontfrag;
  305         u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
  306         struct ip6_exthdrs exthdrs;
  307         struct in6_addr src0, dst0;
  308         u_int32_t zone;
  309         struct route_in6 *ro_pmtu = NULL;
  310         int hdrsplit = 0;
  311         int sw_csum, tso;
  312         int needfiblookup;
  313         uint32_t fibnum;
  314         struct m_tag *fwd_tag = NULL;
  315         uint32_t id;
  316 
  317         if (inp != NULL) {
  318                 INP_LOCK_ASSERT(inp);
  319                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
  320                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
  321                         /* unconditionally set flowid */
  322                         m->m_pkthdr.flowid = inp->inp_flowid;
  323                         M_HASHTYPE_SET(m, inp->inp_flowtype);
  324                 }
  325         }
  326 
  327 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
  328         /*
  329          * IPSec checking which handles several cases.
  330          * FAST IPSEC: We re-injected the packet.
  331          * XXX: need scope argument.
  332          */
  333         if (IPSEC_ENABLED(ipv6)) {
  334                 if ((error = IPSEC_OUTPUT(ipv6, m, inp)) != 0) {
  335                         if (error == EINPROGRESS)
  336                                 error = 0;
  337                         goto done;
  338                 }
  339         }
  340 #endif /* IPSEC */
  341 
  342         bzero(&exthdrs, sizeof(exthdrs));
  343         if (opt) {
  344                 /* Hop-by-Hop options header */
  345                 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
  346                 /* Destination options header(1st part) */
  347                 if (opt->ip6po_rthdr) {
  348                         /*
  349                          * Destination options header(1st part)
  350                          * This only makes sense with a routing header.
  351                          * See Section 9.2 of RFC 3542.
  352                          * Disabling this part just for MIP6 convenience is
  353                          * a bad idea.  We need to think carefully about a
  354                          * way to make the advanced API coexist with MIP6
  355                          * options, which might automatically be inserted in
  356                          * the kernel.
  357                          */
  358                         MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
  359                 }
  360                 /* Routing header */
  361                 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
  362                 /* Destination options header(2nd part) */
  363                 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
  364         }
  365 
  366         /*
  367          * Calculate the total length of the extension header chain.
  368          * Keep the length of the unfragmentable part for fragmentation.
  369          */
  370         optlen = 0;
  371         if (exthdrs.ip6e_hbh)
  372                 optlen += exthdrs.ip6e_hbh->m_len;
  373         if (exthdrs.ip6e_dest1)
  374                 optlen += exthdrs.ip6e_dest1->m_len;
  375         if (exthdrs.ip6e_rthdr)
  376                 optlen += exthdrs.ip6e_rthdr->m_len;
  377         unfragpartlen = optlen + sizeof(struct ip6_hdr);
  378 
  379         /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */
  380         if (exthdrs.ip6e_dest2)
  381                 optlen += exthdrs.ip6e_dest2->m_len;
  382 
  383         /*
  384          * If there is at least one extension header,
  385          * separate IP6 header from the payload.
  386          */
  387         if (optlen && !hdrsplit) {
  388                 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
  389                         m = NULL;
  390                         goto freehdrs;
  391                 }
  392                 m = exthdrs.ip6e_ip6;
  393                 hdrsplit++;
  394         }
  395 
  396         ip6 = mtod(m, struct ip6_hdr *);
  397 
  398         /* adjust mbuf packet header length */
  399         m->m_pkthdr.len += optlen;
  400         plen = m->m_pkthdr.len - sizeof(*ip6);
  401 
  402         /* If this is a jumbo payload, insert a jumbo payload option. */
  403         if (plen > IPV6_MAXPACKET) {
  404                 if (!hdrsplit) {
  405                         if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
  406                                 m = NULL;
  407                                 goto freehdrs;
  408                         }
  409                         m = exthdrs.ip6e_ip6;
  410                         hdrsplit++;
  411                 }
  412                 /* adjust pointer */
  413                 ip6 = mtod(m, struct ip6_hdr *);
  414                 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
  415                         goto freehdrs;
  416                 ip6->ip6_plen = 0;
  417         } else
  418                 ip6->ip6_plen = htons(plen);
  419 
  420         /*
  421          * Concatenate headers and fill in next header fields.
  422          * Here we have, on "m"
  423          *      IPv6 payload
  424          * and we insert headers accordingly.  Finally, we should be getting:
  425          *      IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
  426          *
  427          * during the header composing process, "m" points to IPv6 header.
  428          * "mprev" points to an extension header prior to esp.
  429          */
  430         u_char *nexthdrp = &ip6->ip6_nxt;
  431         mprev = m;
  432 
  433         /*
  434          * we treat dest2 specially.  this makes IPsec processing
  435          * much easier.  the goal here is to make mprev point the
  436          * mbuf prior to dest2.
  437          *
  438          * result: IPv6 dest2 payload
  439          * m and mprev will point to IPv6 header.
  440          */
  441         if (exthdrs.ip6e_dest2) {
  442                 if (!hdrsplit)
  443                         panic("assumption failed: hdr not split");
  444                 exthdrs.ip6e_dest2->m_next = m->m_next;
  445                 m->m_next = exthdrs.ip6e_dest2;
  446                 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
  447                 ip6->ip6_nxt = IPPROTO_DSTOPTS;
  448         }
  449 
  450         /*
  451          * result: IPv6 hbh dest1 rthdr dest2 payload
  452          * m will point to IPv6 header.  mprev will point to the
  453          * extension header prior to dest2 (rthdr in the above case).
  454          */
  455         MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
  456         MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
  457                    IPPROTO_DSTOPTS);
  458         MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
  459                    IPPROTO_ROUTING);
  460 
  461         /*
  462          * If there is a routing header, discard the packet.
  463          */
  464         if (exthdrs.ip6e_rthdr) {
  465                  error = EINVAL;
  466                  goto bad;
  467         }
  468 
  469         /* Source address validation */
  470         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
  471             (flags & IPV6_UNSPECSRC) == 0) {
  472                 error = EOPNOTSUPP;
  473                 IP6STAT_INC(ip6s_badscope);
  474                 goto bad;
  475         }
  476         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
  477                 error = EOPNOTSUPP;
  478                 IP6STAT_INC(ip6s_badscope);
  479                 goto bad;
  480         }
  481 
  482         IP6STAT_INC(ip6s_localout);
  483 
  484         /*
  485          * Route packet.
  486          */
  487         if (ro == NULL) {
  488                 ro = &ip6route;
  489                 bzero((caddr_t)ro, sizeof(*ro));
  490         }
  491         ro_pmtu = ro;
  492         if (opt && opt->ip6po_rthdr)
  493                 ro = &opt->ip6po_route;
  494         dst = (struct sockaddr_in6 *)&ro->ro_dst;
  495         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
  496 again:
  497         /*
  498          * if specified, try to fill in the traffic class field.
  499          * do not override if a non-zero value is already set.
  500          * we check the diffserv field and the ecn field separately.
  501          */
  502         if (opt && opt->ip6po_tclass >= 0) {
  503                 int mask = 0;
  504 
  505                 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
  506                         mask |= 0xfc;
  507                 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
  508                         mask |= 0x03;
  509                 if (mask != 0)
  510                         ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
  511         }
  512 
  513         /* fill in or override the hop limit field, if necessary. */
  514         if (opt && opt->ip6po_hlim != -1)
  515                 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
  516         else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  517                 if (im6o != NULL)
  518                         ip6->ip6_hlim = im6o->im6o_multicast_hlim;
  519                 else
  520                         ip6->ip6_hlim = V_ip6_defmcasthlim;
  521         }
  522         /*
  523          * Validate route against routing table additions;
  524          * a better/more specific route might have been added.
  525          * Make sure address family is set in route.
  526          */
  527         if (inp) {
  528                 ro->ro_dst.sin6_family = AF_INET6;
  529                 RT_VALIDATE((struct route *)ro, &inp->inp_rt_cookie, fibnum);
  530         }
  531         if (ro->ro_rt && fwd_tag == NULL && (ro->ro_rt->rt_flags & RTF_UP) &&
  532             ro->ro_dst.sin6_family == AF_INET6 &&
  533             IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) {
  534                 rt = ro->ro_rt;
  535                 ifp = ro->ro_rt->rt_ifp;
  536         } else {
  537                 if (ro->ro_lle)
  538                         LLE_FREE(ro->ro_lle);   /* zeros ro_lle */
  539                 ro->ro_lle = NULL;
  540                 if (fwd_tag == NULL) {
  541                         bzero(&dst_sa, sizeof(dst_sa));
  542                         dst_sa.sin6_family = AF_INET6;
  543                         dst_sa.sin6_len = sizeof(dst_sa);
  544                         dst_sa.sin6_addr = ip6->ip6_dst;
  545                 }
  546                 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
  547                     &rt, fibnum);
  548                 if (error != 0) {
  549                         if (ifp != NULL)
  550                                 in6_ifstat_inc(ifp, ifs6_out_discard);
  551                         goto bad;
  552                 }
  553         }
  554         if (rt == NULL) {
  555                 /*
  556                  * If in6_selectroute() does not return a route entry,
  557                  * dst may not have been updated.
  558                  */
  559                 *dst = dst_sa;  /* XXX */
  560         }
  561 
  562         /*
  563          * then rt (for unicast) and ifp must be non-NULL valid values.
  564          */
  565         if ((flags & IPV6_FORWARDING) == 0) {
  566                 /* XXX: the FORWARDING flag can be set for mrouting. */
  567                 in6_ifstat_inc(ifp, ifs6_out_request);
  568         }
  569         if (rt != NULL) {
  570                 ia = (struct in6_ifaddr *)(rt->rt_ifa);
  571                 counter_u64_add(rt->rt_pksent, 1);
  572         }
  573 
  574 
  575         /*
  576          * The outgoing interface must be in the zone of source and
  577          * destination addresses.
  578          */
  579         origifp = ifp;
  580 
  581         src0 = ip6->ip6_src;
  582         if (in6_setscope(&src0, origifp, &zone))
  583                 goto badscope;
  584         bzero(&src_sa, sizeof(src_sa));
  585         src_sa.sin6_family = AF_INET6;
  586         src_sa.sin6_len = sizeof(src_sa);
  587         src_sa.sin6_addr = ip6->ip6_src;
  588         if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
  589                 goto badscope;
  590 
  591         dst0 = ip6->ip6_dst;
  592         if (in6_setscope(&dst0, origifp, &zone))
  593                 goto badscope;
  594         /* re-initialize to be sure */
  595         bzero(&dst_sa, sizeof(dst_sa));
  596         dst_sa.sin6_family = AF_INET6;
  597         dst_sa.sin6_len = sizeof(dst_sa);
  598         dst_sa.sin6_addr = ip6->ip6_dst;
  599         if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
  600                 goto badscope;
  601         }
  602 
  603         /* We should use ia_ifp to support the case of
  604          * sending packets to an address of our own.
  605          */
  606         if (ia != NULL && ia->ia_ifp)
  607                 ifp = ia->ia_ifp;
  608 
  609         /* scope check is done. */
  610         goto routefound;
  611 
  612   badscope:
  613         IP6STAT_INC(ip6s_badscope);
  614         in6_ifstat_inc(origifp, ifs6_out_discard);
  615         if (error == 0)
  616                 error = EHOSTUNREACH; /* XXX */
  617         goto bad;
  618 
  619   routefound:
  620         if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  621                 if (opt && opt->ip6po_nextroute.ro_rt) {
  622                         /*
  623                          * The nexthop is explicitly specified by the
  624                          * application.  We assume the next hop is an IPv6
  625                          * address.
  626                          */
  627                         dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
  628                 }
  629                 else if ((rt->rt_flags & RTF_GATEWAY))
  630                         dst = (struct sockaddr_in6 *)rt->rt_gateway;
  631         }
  632 
  633         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  634                 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
  635         } else {
  636                 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
  637                 in6_ifstat_inc(ifp, ifs6_out_mcast);
  638                 /*
  639                  * Confirm that the outgoing interface supports multicast.
  640                  */
  641                 if (!(ifp->if_flags & IFF_MULTICAST)) {
  642                         IP6STAT_INC(ip6s_noroute);
  643                         in6_ifstat_inc(ifp, ifs6_out_discard);
  644                         error = ENETUNREACH;
  645                         goto bad;
  646                 }
  647                 if ((im6o == NULL && in6_mcast_loop) ||
  648                     (im6o && im6o->im6o_multicast_loop)) {
  649                         /*
  650                          * Loop back multicast datagram if not expressly
  651                          * forbidden to do so, even if we have not joined
  652                          * the address; protocols will filter it later,
  653                          * thus deferring a hash lookup and lock acquisition
  654                          * at the expense of an m_copym().
  655                          */
  656                         ip6_mloopback(ifp, m);
  657                 } else {
  658                         /*
  659                          * If we are acting as a multicast router, perform
  660                          * multicast forwarding as if the packet had just
  661                          * arrived on the interface to which we are about
  662                          * to send.  The multicast forwarding function
  663                          * recursively calls this function, using the
  664                          * IPV6_FORWARDING flag to prevent infinite recursion.
  665                          *
  666                          * Multicasts that are looped back by ip6_mloopback(),
  667                          * above, will be forwarded by the ip6_input() routine,
  668                          * if necessary.
  669                          */
  670                         if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
  671                                 /*
  672                                  * XXX: ip6_mforward expects that rcvif is NULL
  673                                  * when it is called from the originating path.
  674                                  * However, it may not always be the case.
  675                                  */
  676                                 m->m_pkthdr.rcvif = NULL;
  677                                 if (ip6_mforward(ip6, ifp, m) != 0) {
  678                                         m_freem(m);
  679                                         goto done;
  680                                 }
  681                         }
  682                 }
  683                 /*
  684                  * Multicasts with a hoplimit of zero may be looped back,
  685                  * above, but must not be transmitted on a network.
  686                  * Also, multicasts addressed to the loopback interface
  687                  * are not sent -- the above call to ip6_mloopback() will
  688                  * loop back a copy if this host actually belongs to the
  689                  * destination group on the loopback interface.
  690                  */
  691                 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
  692                     IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
  693                         m_freem(m);
  694                         goto done;
  695                 }
  696         }
  697 
  698         /*
  699          * Fill the outgoing inteface to tell the upper layer
  700          * to increment per-interface statistics.
  701          */
  702         if (ifpp)
  703                 *ifpp = ifp;
  704 
  705         /* Determine path MTU. */
  706         if ((error = ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst,
  707                     &mtu, &alwaysfrag, fibnum, *nexthdrp)) != 0)
  708                 goto bad;
  709 
  710         /*
  711          * The caller of this function may specify to use the minimum MTU
  712          * in some cases.
  713          * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
  714          * setting.  The logic is a bit complicated; by default, unicast
  715          * packets will follow path MTU while multicast packets will be sent at
  716          * the minimum MTU.  If IP6PO_MINMTU_ALL is specified, all packets
  717          * including unicast ones will be sent at the minimum MTU.  Multicast
  718          * packets will always be sent at the minimum MTU unless
  719          * IP6PO_MINMTU_DISABLE is explicitly specified.
  720          * See RFC 3542 for more details.
  721          */
  722         if (mtu > IPV6_MMTU) {
  723                 if ((flags & IPV6_MINMTU))
  724                         mtu = IPV6_MMTU;
  725                 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
  726                         mtu = IPV6_MMTU;
  727                 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
  728                          (opt == NULL ||
  729                           opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
  730                         mtu = IPV6_MMTU;
  731                 }
  732         }
  733 
  734         /*
  735          * clear embedded scope identifiers if necessary.
  736          * in6_clearscope will touch the addresses only when necessary.
  737          */
  738         in6_clearscope(&ip6->ip6_src);
  739         in6_clearscope(&ip6->ip6_dst);
  740 
  741         /*
  742          * If the outgoing packet contains a hop-by-hop options header,
  743          * it must be examined and processed even by the source node.
  744          * (RFC 2460, section 4.)
  745          */
  746         if (exthdrs.ip6e_hbh) {
  747                 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
  748                 u_int32_t dummy; /* XXX unused */
  749                 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
  750 
  751 #ifdef DIAGNOSTIC
  752                 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
  753                         panic("ip6e_hbh is not contiguous");
  754 #endif
  755                 /*
  756                  *  XXX: if we have to send an ICMPv6 error to the sender,
  757                  *       we need the M_LOOP flag since icmp6_error() expects
  758                  *       the IPv6 and the hop-by-hop options header are
  759                  *       contiguous unless the flag is set.
  760                  */
  761                 m->m_flags |= M_LOOP;
  762                 m->m_pkthdr.rcvif = ifp;
  763                 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
  764                     ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
  765                     &dummy, &plen) < 0) {
  766                         /* m was already freed at this point */
  767                         error = EINVAL;/* better error? */
  768                         goto done;
  769                 }
  770                 m->m_flags &= ~M_LOOP; /* XXX */
  771                 m->m_pkthdr.rcvif = NULL;
  772         }
  773 
  774         /* Jump over all PFIL processing if hooks are not active. */
  775         if (!PFIL_HOOKED(&V_inet6_pfil_hook))
  776                 goto passout;
  777 
  778         odst = ip6->ip6_dst;
  779         /* Run through list of hooks for output packets. */
  780         error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, 0, inp);
  781         if (error != 0 || m == NULL)
  782                 goto done;
  783         /* adjust pointer */
  784         ip6 = mtod(m, struct ip6_hdr *);
  785 
  786         needfiblookup = 0;
  787         /* See if destination IP address was changed by packet filter. */
  788         if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
  789                 m->m_flags |= M_SKIP_FIREWALL;
  790                 /* If destination is now ourself drop to ip6_input(). */
  791                 if (in6_localip(&ip6->ip6_dst)) {
  792                         m->m_flags |= M_FASTFWD_OURS;
  793                         if (m->m_pkthdr.rcvif == NULL)
  794                                 m->m_pkthdr.rcvif = V_loif;
  795                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
  796                                 m->m_pkthdr.csum_flags |=
  797                                     CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
  798                                 m->m_pkthdr.csum_data = 0xffff;
  799                         }
  800 #ifdef SCTP
  801                         if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
  802                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
  803 #endif
  804                         error = netisr_queue(NETISR_IPV6, m);
  805                         goto done;
  806                 } else {
  807                         RO_INVALIDATE_CACHE(ro);
  808                         needfiblookup = 1; /* Redo the routing table lookup. */
  809                 }
  810         }
  811         /* See if fib was changed by packet filter. */
  812         if (fibnum != M_GETFIB(m)) {
  813                 m->m_flags |= M_SKIP_FIREWALL;
  814                 fibnum = M_GETFIB(m);
  815                 RO_INVALIDATE_CACHE(ro);
  816                 needfiblookup = 1;
  817         }
  818         if (needfiblookup)
  819                 goto again;
  820 
  821         /* See if local, if yes, send it to netisr. */
  822         if (m->m_flags & M_FASTFWD_OURS) {
  823                 if (m->m_pkthdr.rcvif == NULL)
  824                         m->m_pkthdr.rcvif = V_loif;
  825                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
  826                         m->m_pkthdr.csum_flags |=
  827                             CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
  828                         m->m_pkthdr.csum_data = 0xffff;
  829                 }
  830 #ifdef SCTP
  831                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
  832                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
  833 #endif
  834                 error = netisr_queue(NETISR_IPV6, m);
  835                 goto done;
  836         }
  837         /* Or forward to some other address? */
  838         if ((m->m_flags & M_IP6_NEXTHOP) &&
  839             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
  840                 dst = (struct sockaddr_in6 *)&ro->ro_dst;
  841                 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
  842                 m->m_flags |= M_SKIP_FIREWALL;
  843                 m->m_flags &= ~M_IP6_NEXTHOP;
  844                 m_tag_delete(m, fwd_tag);
  845                 goto again;
  846         }
  847 
  848 passout:
  849         /*
  850          * Send the packet to the outgoing interface.
  851          * If necessary, do IPv6 fragmentation before sending.
  852          *
  853          * the logic here is rather complex:
  854          * 1: normal case (dontfrag == 0, alwaysfrag == 0)
  855          * 1-a: send as is if tlen <= path mtu
  856          * 1-b: fragment if tlen > path mtu
  857          *
  858          * 2: if user asks us not to fragment (dontfrag == 1)
  859          * 2-a: send as is if tlen <= interface mtu
  860          * 2-b: error if tlen > interface mtu
  861          *
  862          * 3: if we always need to attach fragment header (alwaysfrag == 1)
  863          *      always fragment
  864          *
  865          * 4: if dontfrag == 1 && alwaysfrag == 1
  866          *      error, as we cannot handle this conflicting request
  867          */
  868         sw_csum = m->m_pkthdr.csum_flags;
  869         if (!hdrsplit) {
  870                 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0;
  871                 sw_csum &= ~ifp->if_hwassist;
  872         } else
  873                 tso = 0;
  874         /*
  875          * If we added extension headers, we will not do TSO and calculate the
  876          * checksums ourselves for now.
  877          * XXX-BZ  Need a framework to know when the NIC can handle it, even
  878          * with ext. hdrs.
  879          */
  880         if (sw_csum & CSUM_DELAY_DATA_IPV6) {
  881                 sw_csum &= ~CSUM_DELAY_DATA_IPV6;
  882                 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
  883         }
  884 #ifdef SCTP
  885         if (sw_csum & CSUM_SCTP_IPV6) {
  886                 sw_csum &= ~CSUM_SCTP_IPV6;
  887                 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
  888         }
  889 #endif
  890         m->m_pkthdr.csum_flags &= ifp->if_hwassist;
  891         tlen = m->m_pkthdr.len;
  892 
  893         if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
  894                 dontfrag = 1;
  895         else
  896                 dontfrag = 0;
  897         if (dontfrag && alwaysfrag) {   /* case 4 */
  898                 /* conflicting request - can't transmit */
  899                 error = EMSGSIZE;
  900                 goto bad;
  901         }
  902         if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) {      /* case 2-b */
  903                 /*
  904                  * Even if the DONTFRAG option is specified, we cannot send the
  905                  * packet when the data length is larger than the MTU of the
  906                  * outgoing interface.
  907                  * Notify the error by sending IPV6_PATHMTU ancillary data if
  908                  * application wanted to know the MTU value. Also return an
  909                  * error code (this is not described in the API spec).
  910                  */
  911                 if (inp != NULL)
  912                         ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu);
  913                 error = EMSGSIZE;
  914                 goto bad;
  915         }
  916 
  917         /*
  918          * transmit packet without fragmentation
  919          */
  920         if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
  921                 struct in6_ifaddr *ia6;
  922 
  923                 ip6 = mtod(m, struct ip6_hdr *);
  924                 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
  925                 if (ia6) {
  926                         /* Record statistics for this interface address. */
  927                         counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
  928                         counter_u64_add(ia6->ia_ifa.ifa_obytes,
  929                             m->m_pkthdr.len);
  930                         ifa_free(&ia6->ia_ifa);
  931                 }
  932 #ifdef RATELIMIT
  933                 if (inp != NULL) {
  934                         if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
  935                                 in_pcboutput_txrtlmt(inp, ifp, m);
  936                         /* stamp send tag on mbuf */
  937                         m->m_pkthdr.snd_tag = inp->inp_snd_tag;
  938                 } else {
  939                         m->m_pkthdr.snd_tag = NULL;
  940                 }
  941 #endif
  942                 error = nd6_output_ifp(ifp, origifp, m, dst,
  943                     (struct route *)ro);
  944 #ifdef RATELIMIT
  945                 /* check for route change */
  946                 if (error == EAGAIN)
  947                         in_pcboutput_eagain(inp);
  948 #endif
  949                 goto done;
  950         }
  951 
  952         /*
  953          * try to fragment the packet.  case 1-b and 3
  954          */
  955         if (mtu < IPV6_MMTU) {
  956                 /* path MTU cannot be less than IPV6_MMTU */
  957                 error = EMSGSIZE;
  958                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
  959                 goto bad;
  960         } else if (ip6->ip6_plen == 0) {
  961                 /* jumbo payload cannot be fragmented */
  962                 error = EMSGSIZE;
  963                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
  964                 goto bad;
  965         } else {
  966                 u_char nextproto;
  967 
  968                 /*
  969                  * Too large for the destination or interface;
  970                  * fragment if possible.
  971                  * Must be able to put at least 8 bytes per fragment.
  972                  */
  973                 hlen = unfragpartlen;
  974                 if (mtu > IPV6_MAXPACKET)
  975                         mtu = IPV6_MAXPACKET;
  976 
  977                 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
  978                 if (len < 8) {
  979                         error = EMSGSIZE;
  980                         in6_ifstat_inc(ifp, ifs6_out_fragfail);
  981                         goto bad;
  982                 }
  983 
  984                 /*
  985                  * If the interface will not calculate checksums on
  986                  * fragmented packets, then do it here.
  987                  * XXX-BZ handle the hw offloading case.  Need flags.
  988                  */
  989                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
  990                         in6_delayed_cksum(m, plen, hlen);
  991                         m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
  992                 }
  993 #ifdef SCTP
  994                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
  995                         sctp_delayed_cksum(m, hlen);
  996                         m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
  997                 }
  998 #endif
  999                 /*
 1000                  * Change the next header field of the last header in the
 1001                  * unfragmentable part.
 1002                  */
 1003                 if (exthdrs.ip6e_rthdr) {
 1004                         nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
 1005                         *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
 1006                 } else if (exthdrs.ip6e_dest1) {
 1007                         nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
 1008                         *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
 1009                 } else if (exthdrs.ip6e_hbh) {
 1010                         nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
 1011                         *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
 1012                 } else {
 1013                         nextproto = ip6->ip6_nxt;
 1014                         ip6->ip6_nxt = IPPROTO_FRAGMENT;
 1015                 }
 1016 
 1017                 /*
 1018                  * Loop through length of segment after first fragment,
 1019                  * make new header and copy data of each part and link onto
 1020                  * chain.
 1021                  */
 1022                 m0 = m;
 1023                 id = htonl(ip6_randomid());
 1024                 if ((error = ip6_fragment(ifp, m, hlen, nextproto, len, id)))
 1025                         goto sendorfree;
 1026 
 1027                 in6_ifstat_inc(ifp, ifs6_out_fragok);
 1028         }
 1029 
 1030         /*
 1031          * Remove leading garbages.
 1032          */
 1033 sendorfree:
 1034         m = m0->m_nextpkt;
 1035         m0->m_nextpkt = 0;
 1036         m_freem(m0);
 1037         for (; m; m = m0) {
 1038                 m0 = m->m_nextpkt;
 1039                 m->m_nextpkt = 0;
 1040                 if (error == 0) {
 1041                         /* Record statistics for this interface address. */
 1042                         if (ia) {
 1043                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 1044                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
 1045                                     m->m_pkthdr.len);
 1046                         }
 1047 #ifdef RATELIMIT
 1048                         if (inp != NULL) {
 1049                                 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
 1050                                         in_pcboutput_txrtlmt(inp, ifp, m);
 1051                                 /* stamp send tag on mbuf */
 1052                                 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
 1053                         } else {
 1054                                 m->m_pkthdr.snd_tag = NULL;
 1055                         }
 1056 #endif
 1057                         error = nd6_output_ifp(ifp, origifp, m, dst,
 1058                             (struct route *)ro);
 1059 #ifdef RATELIMIT
 1060                         /* check for route change */
 1061                         if (error == EAGAIN)
 1062                                 in_pcboutput_eagain(inp);
 1063 #endif
 1064                 } else
 1065                         m_freem(m);
 1066         }
 1067 
 1068         if (error == 0)
 1069                 IP6STAT_INC(ip6s_fragmented);
 1070 
 1071 done:
 1072         if (ro == &ip6route)
 1073                 RO_RTFREE(ro);
 1074         return (error);
 1075 
 1076 freehdrs:
 1077         m_freem(exthdrs.ip6e_hbh);      /* m_freem will check if mbuf is 0 */
 1078         m_freem(exthdrs.ip6e_dest1);
 1079         m_freem(exthdrs.ip6e_rthdr);
 1080         m_freem(exthdrs.ip6e_dest2);
 1081         /* FALLTHROUGH */
 1082 bad:
 1083         if (m)
 1084                 m_freem(m);
 1085         goto done;
 1086 }
 1087 
 1088 static int
 1089 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
 1090 {
 1091         struct mbuf *m;
 1092 
 1093         if (hlen > MCLBYTES)
 1094                 return (ENOBUFS); /* XXX */
 1095 
 1096         if (hlen > MLEN)
 1097                 m = m_getcl(M_NOWAIT, MT_DATA, 0);
 1098         else
 1099                 m = m_get(M_NOWAIT, MT_DATA);
 1100         if (m == NULL)
 1101                 return (ENOBUFS);
 1102         m->m_len = hlen;
 1103         if (hdr)
 1104                 bcopy(hdr, mtod(m, caddr_t), hlen);
 1105 
 1106         *mp = m;
 1107         return (0);
 1108 }
 1109 
 1110 /*
 1111  * Insert jumbo payload option.
 1112  */
 1113 static int
 1114 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
 1115 {
 1116         struct mbuf *mopt;
 1117         u_char *optbuf;
 1118         u_int32_t v;
 1119 
 1120 #define JUMBOOPTLEN     8       /* length of jumbo payload option and padding */
 1121 
 1122         /*
 1123          * If there is no hop-by-hop options header, allocate new one.
 1124          * If there is one but it doesn't have enough space to store the
 1125          * jumbo payload option, allocate a cluster to store the whole options.
 1126          * Otherwise, use it to store the options.
 1127          */
 1128         if (exthdrs->ip6e_hbh == NULL) {
 1129                 mopt = m_get(M_NOWAIT, MT_DATA);
 1130                 if (mopt == NULL)
 1131                         return (ENOBUFS);
 1132                 mopt->m_len = JUMBOOPTLEN;
 1133                 optbuf = mtod(mopt, u_char *);
 1134                 optbuf[1] = 0;  /* = ((JUMBOOPTLEN) >> 3) - 1 */
 1135                 exthdrs->ip6e_hbh = mopt;
 1136         } else {
 1137                 struct ip6_hbh *hbh;
 1138 
 1139                 mopt = exthdrs->ip6e_hbh;
 1140                 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
 1141                         /*
 1142                          * XXX assumption:
 1143                          * - exthdrs->ip6e_hbh is not referenced from places
 1144                          *   other than exthdrs.
 1145                          * - exthdrs->ip6e_hbh is not an mbuf chain.
 1146                          */
 1147                         int oldoptlen = mopt->m_len;
 1148                         struct mbuf *n;
 1149 
 1150                         /*
 1151                          * XXX: give up if the whole (new) hbh header does
 1152                          * not fit even in an mbuf cluster.
 1153                          */
 1154                         if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
 1155                                 return (ENOBUFS);
 1156 
 1157                         /*
 1158                          * As a consequence, we must always prepare a cluster
 1159                          * at this point.
 1160                          */
 1161                         n = m_getcl(M_NOWAIT, MT_DATA, 0);
 1162                         if (n == NULL)
 1163                                 return (ENOBUFS);
 1164                         n->m_len = oldoptlen + JUMBOOPTLEN;
 1165                         bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
 1166                             oldoptlen);
 1167                         optbuf = mtod(n, caddr_t) + oldoptlen;
 1168                         m_freem(mopt);
 1169                         mopt = exthdrs->ip6e_hbh = n;
 1170                 } else {
 1171                         optbuf = mtod(mopt, u_char *) + mopt->m_len;
 1172                         mopt->m_len += JUMBOOPTLEN;
 1173                 }
 1174                 optbuf[0] = IP6OPT_PADN;
 1175                 optbuf[1] = 1;
 1176 
 1177                 /*
 1178                  * Adjust the header length according to the pad and
 1179                  * the jumbo payload option.
 1180                  */
 1181                 hbh = mtod(mopt, struct ip6_hbh *);
 1182                 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
 1183         }
 1184 
 1185         /* fill in the option. */
 1186         optbuf[2] = IP6OPT_JUMBO;
 1187         optbuf[3] = 4;
 1188         v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
 1189         bcopy(&v, &optbuf[4], sizeof(u_int32_t));
 1190 
 1191         /* finally, adjust the packet header length */
 1192         exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
 1193 
 1194         return (0);
 1195 #undef JUMBOOPTLEN
 1196 }
 1197 
 1198 /*
 1199  * Insert fragment header and copy unfragmentable header portions.
 1200  */
 1201 static int
 1202 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
 1203     struct ip6_frag **frghdrp)
 1204 {
 1205         struct mbuf *n, *mlast;
 1206 
 1207         if (hlen > sizeof(struct ip6_hdr)) {
 1208                 n = m_copym(m0, sizeof(struct ip6_hdr),
 1209                     hlen - sizeof(struct ip6_hdr), M_NOWAIT);
 1210                 if (n == NULL)
 1211                         return (ENOBUFS);
 1212                 m->m_next = n;
 1213         } else
 1214                 n = m;
 1215 
 1216         /* Search for the last mbuf of unfragmentable part. */
 1217         for (mlast = n; mlast->m_next; mlast = mlast->m_next)
 1218                 ;
 1219 
 1220         if (M_WRITABLE(mlast) &&
 1221             M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
 1222                 /* use the trailing space of the last mbuf for the fragment hdr */
 1223                 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
 1224                     mlast->m_len);
 1225                 mlast->m_len += sizeof(struct ip6_frag);
 1226                 m->m_pkthdr.len += sizeof(struct ip6_frag);
 1227         } else {
 1228                 /* allocate a new mbuf for the fragment header */
 1229                 struct mbuf *mfrg;
 1230 
 1231                 mfrg = m_get(M_NOWAIT, MT_DATA);
 1232                 if (mfrg == NULL)
 1233                         return (ENOBUFS);
 1234                 mfrg->m_len = sizeof(struct ip6_frag);
 1235                 *frghdrp = mtod(mfrg, struct ip6_frag *);
 1236                 mlast->m_next = mfrg;
 1237         }
 1238 
 1239         return (0);
 1240 }
 1241 
 1242 /*
 1243  * Calculates IPv6 path mtu for destination @dst.
 1244  * Resulting MTU is stored in @mtup.
 1245  *
 1246  * Returns 0 on success.
 1247  */
 1248 static int
 1249 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup)
 1250 {
 1251         struct nhop6_extended nh6;
 1252         struct in6_addr kdst;
 1253         uint32_t scopeid;
 1254         struct ifnet *ifp;
 1255         u_long mtu;
 1256         int error;
 1257 
 1258         in6_splitscope(dst, &kdst, &scopeid);
 1259         if (fib6_lookup_nh_ext(fibnum, &kdst, scopeid, NHR_REF, 0, &nh6) != 0)
 1260                 return (EHOSTUNREACH);
 1261 
 1262         ifp = nh6.nh_ifp;
 1263         mtu = nh6.nh_mtu;
 1264 
 1265         error = ip6_calcmtu(ifp, dst, mtu, mtup, NULL, 0);
 1266         fib6_free_nh_ext(fibnum, &nh6);
 1267 
 1268         return (error);
 1269 }
 1270 
 1271 /*
 1272  * Calculates IPv6 path MTU for @dst based on transmit @ifp,
 1273  * and cached data in @ro_pmtu.
 1274  * MTU from (successful) route lookup is saved (along with dst)
 1275  * inside @ro_pmtu to avoid subsequent route lookups after packet
 1276  * filter processing.
 1277  *
 1278  * Stores mtu and always-frag value into @mtup and @alwaysfragp.
 1279  * Returns 0 on success.
 1280  */
 1281 static int
 1282 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup,
 1283     struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup,
 1284     int *alwaysfragp, u_int fibnum, u_int proto)
 1285 {
 1286         struct nhop6_basic nh6;
 1287         struct in6_addr kdst;
 1288         uint32_t scopeid;
 1289         struct sockaddr_in6 *sa6_dst;
 1290         u_long mtu;
 1291 
 1292         mtu = 0;
 1293         if (do_lookup) {
 1294 
 1295                 /*
 1296                  * Here ro_pmtu has final destination address, while
 1297                  * ro might represent immediate destination.
 1298                  * Use ro_pmtu destination since mtu might differ.
 1299                  */
 1300                 sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
 1301                 if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))
 1302                         ro_pmtu->ro_mtu = 0;
 1303 
 1304                 if (ro_pmtu->ro_mtu == 0) {
 1305                         bzero(sa6_dst, sizeof(*sa6_dst));
 1306                         sa6_dst->sin6_family = AF_INET6;
 1307                         sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
 1308                         sa6_dst->sin6_addr = *dst;
 1309 
 1310                         in6_splitscope(dst, &kdst, &scopeid);
 1311                         if (fib6_lookup_nh_basic(fibnum, &kdst, scopeid, 0, 0,
 1312                             &nh6) == 0)
 1313                                 ro_pmtu->ro_mtu = nh6.nh_mtu;
 1314                 }
 1315 
 1316                 mtu = ro_pmtu->ro_mtu;
 1317         }
 1318 
 1319         if (ro_pmtu->ro_rt)
 1320                 mtu = ro_pmtu->ro_rt->rt_mtu;
 1321 
 1322         return (ip6_calcmtu(ifp, dst, mtu, mtup, alwaysfragp, proto));
 1323 }
 1324 
 1325 /*
 1326  * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and
 1327  * hostcache data for @dst.
 1328  * Stores mtu and always-frag value into @mtup and @alwaysfragp.
 1329  *
 1330  * Returns 0 on success.
 1331  */
 1332 static int
 1333 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu,
 1334     u_long *mtup, int *alwaysfragp, u_int proto)
 1335 {
 1336         u_long mtu = 0;
 1337         int alwaysfrag = 0;
 1338         int error = 0;
 1339 
 1340         if (rt_mtu > 0) {
 1341                 u_int32_t ifmtu;
 1342                 struct in_conninfo inc;
 1343 
 1344                 bzero(&inc, sizeof(inc));
 1345                 inc.inc_flags |= INC_ISIPV6;
 1346                 inc.inc6_faddr = *dst;
 1347 
 1348                 ifmtu = IN6_LINKMTU(ifp);
 1349 
 1350                 /* TCP is known to react to pmtu changes so skip hc */
 1351                 if (proto != IPPROTO_TCP)
 1352                         mtu = tcp_hc_getmtu(&inc);
 1353 
 1354                 if (mtu)
 1355                         mtu = min(mtu, rt_mtu);
 1356                 else
 1357                         mtu = rt_mtu;
 1358                 if (mtu == 0)
 1359                         mtu = ifmtu;
 1360                 else if (mtu < IPV6_MMTU) {
 1361                         /*
 1362                          * RFC2460 section 5, last paragraph:
 1363                          * if we record ICMPv6 too big message with
 1364                          * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
 1365                          * or smaller, with framgent header attached.
 1366                          * (fragment header is needed regardless from the
 1367                          * packet size, for translators to identify packets)
 1368                          */
 1369                         alwaysfrag = 1;
 1370                         mtu = IPV6_MMTU;
 1371                 }
 1372         } else if (ifp) {
 1373                 mtu = IN6_LINKMTU(ifp);
 1374         } else
 1375                 error = EHOSTUNREACH; /* XXX */
 1376 
 1377         *mtup = mtu;
 1378         if (alwaysfragp)
 1379                 *alwaysfragp = alwaysfrag;
 1380         return (error);
 1381 }
 1382 
 1383 /*
 1384  * IP6 socket option processing.
 1385  */
 1386 int
 1387 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
 1388 {
 1389         int optdatalen, uproto;
 1390         void *optdata;
 1391         struct inpcb *in6p = sotoinpcb(so);
 1392         int error, optval;
 1393         int level, op, optname;
 1394         int optlen;
 1395         struct thread *td;
 1396 #ifdef  RSS
 1397         uint32_t rss_bucket;
 1398         int retval;
 1399 #endif
 1400 
 1401 /*
 1402  * Don't use more than a quarter of mbuf clusters.  N.B.:
 1403  * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow
 1404  * on LP64 architectures, so cast to u_long to avoid undefined
 1405  * behavior.  ILP32 architectures cannot have nmbclusters
 1406  * large enough to overflow for other reasons.
 1407  */
 1408 #define IPV6_PKTOPTIONS_MBUF_LIMIT      ((u_long)nmbclusters * MCLBYTES / 4)
 1409 
 1410         level = sopt->sopt_level;
 1411         op = sopt->sopt_dir;
 1412         optname = sopt->sopt_name;
 1413         optlen = sopt->sopt_valsize;
 1414         td = sopt->sopt_td;
 1415         error = 0;
 1416         optval = 0;
 1417         uproto = (int)so->so_proto->pr_protocol;
 1418 
 1419         if (level != IPPROTO_IPV6) {
 1420                 error = EINVAL;
 1421 
 1422                 if (sopt->sopt_level == SOL_SOCKET &&
 1423                     sopt->sopt_dir == SOPT_SET) {
 1424                         switch (sopt->sopt_name) {
 1425                         case SO_REUSEADDR:
 1426                                 INP_WLOCK(in6p);
 1427                                 if ((so->so_options & SO_REUSEADDR) != 0)
 1428                                         in6p->inp_flags2 |= INP_REUSEADDR;
 1429                                 else
 1430                                         in6p->inp_flags2 &= ~INP_REUSEADDR;
 1431                                 INP_WUNLOCK(in6p);
 1432                                 error = 0;
 1433                                 break;
 1434                         case SO_REUSEPORT:
 1435                                 INP_WLOCK(in6p);
 1436                                 if ((so->so_options & SO_REUSEPORT) != 0)
 1437                                         in6p->inp_flags2 |= INP_REUSEPORT;
 1438                                 else
 1439                                         in6p->inp_flags2 &= ~INP_REUSEPORT;
 1440                                 INP_WUNLOCK(in6p);
 1441                                 error = 0;
 1442                                 break;
 1443                         case SO_REUSEPORT_LB:
 1444                                 INP_WLOCK(in6p);
 1445                                 if ((so->so_options & SO_REUSEPORT_LB) != 0)
 1446                                         in6p->inp_flags2 |= INP_REUSEPORT_LB;
 1447                                 else
 1448                                         in6p->inp_flags2 &= ~INP_REUSEPORT_LB;
 1449                                 INP_WUNLOCK(in6p);
 1450                                 error = 0;
 1451                                 break;
 1452                         case SO_SETFIB:
 1453                                 INP_WLOCK(in6p);
 1454                                 in6p->inp_inc.inc_fibnum = so->so_fibnum;
 1455                                 INP_WUNLOCK(in6p);
 1456                                 error = 0;
 1457                                 break;
 1458                         case SO_MAX_PACING_RATE:
 1459 #ifdef RATELIMIT
 1460                                 INP_WLOCK(in6p);
 1461                                 in6p->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
 1462                                 INP_WUNLOCK(in6p);
 1463                                 error = 0;
 1464 #else
 1465                                 error = EOPNOTSUPP;
 1466 #endif
 1467                                 break;
 1468                         default:
 1469                                 break;
 1470                         }
 1471                 }
 1472         } else {                /* level == IPPROTO_IPV6 */
 1473                 switch (op) {
 1474 
 1475                 case SOPT_SET:
 1476                         switch (optname) {
 1477                         case IPV6_2292PKTOPTIONS:
 1478 #ifdef IPV6_PKTOPTIONS
 1479                         case IPV6_PKTOPTIONS:
 1480 #endif
 1481                         {
 1482                                 struct mbuf *m;
 1483 
 1484                                 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) {
 1485                                         printf("ip6_ctloutput: mbuf limit hit\n");
 1486                                         error = ENOBUFS;
 1487                                         break;
 1488                                 }
 1489 
 1490                                 error = soopt_getm(sopt, &m); /* XXX */
 1491                                 if (error != 0)
 1492                                         break;
 1493                                 error = soopt_mcopyin(sopt, m); /* XXX */
 1494                                 if (error != 0)
 1495                                         break;
 1496                                 error = ip6_pcbopts(&in6p->in6p_outputopts,
 1497                                                     m, so, sopt);
 1498                                 m_freem(m); /* XXX */
 1499                                 break;
 1500                         }
 1501 
 1502                         /*
 1503                          * Use of some Hop-by-Hop options or some
 1504                          * Destination options, might require special
 1505                          * privilege.  That is, normal applications
 1506                          * (without special privilege) might be forbidden
 1507                          * from setting certain options in outgoing packets,
 1508                          * and might never see certain options in received
 1509                          * packets. [RFC 2292 Section 6]
 1510                          * KAME specific note:
 1511                          *  KAME prevents non-privileged users from sending or
 1512                          *  receiving ANY hbh/dst options in order to avoid
 1513                          *  overhead of parsing options in the kernel.
 1514                          */
 1515                         case IPV6_RECVHOPOPTS:
 1516                         case IPV6_RECVDSTOPTS:
 1517                         case IPV6_RECVRTHDRDSTOPTS:
 1518                                 if (td != NULL) {
 1519                                         error = priv_check(td,
 1520                                             PRIV_NETINET_SETHDROPTS);
 1521                                         if (error)
 1522                                                 break;
 1523                                 }
 1524                                 /* FALLTHROUGH */
 1525                         case IPV6_UNICAST_HOPS:
 1526                         case IPV6_HOPLIMIT:
 1527 
 1528                         case IPV6_RECVPKTINFO:
 1529                         case IPV6_RECVHOPLIMIT:
 1530                         case IPV6_RECVRTHDR:
 1531                         case IPV6_RECVPATHMTU:
 1532                         case IPV6_RECVTCLASS:
 1533                         case IPV6_RECVFLOWID:
 1534 #ifdef  RSS
 1535                         case IPV6_RECVRSSBUCKETID:
 1536 #endif
 1537                         case IPV6_V6ONLY:
 1538                         case IPV6_AUTOFLOWLABEL:
 1539                         case IPV6_ORIGDSTADDR:
 1540                         case IPV6_BINDANY:
 1541                         case IPV6_BINDMULTI:
 1542 #ifdef  RSS
 1543                         case IPV6_RSS_LISTEN_BUCKET:
 1544 #endif
 1545                                 if (optname == IPV6_BINDANY && td != NULL) {
 1546                                         error = priv_check(td,
 1547                                             PRIV_NETINET_BINDANY);
 1548                                         if (error)
 1549                                                 break;
 1550                                 }
 1551 
 1552                                 if (optlen != sizeof(int)) {
 1553                                         error = EINVAL;
 1554                                         break;
 1555                                 }
 1556                                 error = sooptcopyin(sopt, &optval,
 1557                                         sizeof optval, sizeof optval);
 1558                                 if (error)
 1559                                         break;
 1560                                 switch (optname) {
 1561 
 1562                                 case IPV6_UNICAST_HOPS:
 1563                                         if (optval < -1 || optval >= 256)
 1564                                                 error = EINVAL;
 1565                                         else {
 1566                                                 /* -1 = kernel default */
 1567                                                 in6p->in6p_hops = optval;
 1568                                                 if ((in6p->inp_vflag &
 1569                                                      INP_IPV4) != 0)
 1570                                                         in6p->inp_ip_ttl = optval;
 1571                                         }
 1572                                         break;
 1573 #define OPTSET(bit) \
 1574 do { \
 1575         INP_WLOCK(in6p); \
 1576         if (optval) \
 1577                 in6p->inp_flags |= (bit); \
 1578         else \
 1579                 in6p->inp_flags &= ~(bit); \
 1580         INP_WUNLOCK(in6p); \
 1581 } while (/*CONSTCOND*/ 0)
 1582 #define OPTSET2292(bit) \
 1583 do { \
 1584         INP_WLOCK(in6p); \
 1585         in6p->inp_flags |= IN6P_RFC2292; \
 1586         if (optval) \
 1587                 in6p->inp_flags |= (bit); \
 1588         else \
 1589                 in6p->inp_flags &= ~(bit); \
 1590         INP_WUNLOCK(in6p); \
 1591 } while (/*CONSTCOND*/ 0)
 1592 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
 1593 
 1594 #define OPTSET2_N(bit, val) do {                                        \
 1595         if (val)                                                        \
 1596                 in6p->inp_flags2 |= bit;                                \
 1597         else                                                            \
 1598                 in6p->inp_flags2 &= ~bit;                               \
 1599 } while (0)
 1600 #define OPTSET2(bit, val) do {                                          \
 1601         INP_WLOCK(in6p);                                                \
 1602         OPTSET2_N(bit, val);                                            \
 1603         INP_WUNLOCK(in6p);                                              \
 1604 } while (0)
 1605 #define OPTBIT2(bit) (in6p->inp_flags2 & (bit) ? 1 : 0)
 1606 #define OPTSET2292_EXCLUSIVE(bit)                                       \
 1607 do {                                                                    \
 1608         INP_WLOCK(in6p);                                                \
 1609         if (OPTBIT(IN6P_RFC2292)) {                                     \
 1610                 error = EINVAL;                                         \
 1611         } else {                                                        \
 1612                 if (optval)                                             \
 1613                         in6p->inp_flags |= (bit);                       \
 1614                 else                                                    \
 1615                         in6p->inp_flags &= ~(bit);                      \
 1616         }                                                               \
 1617         INP_WUNLOCK(in6p);                                              \
 1618 } while (/*CONSTCOND*/ 0)
 1619 
 1620                                 case IPV6_RECVPKTINFO:
 1621                                         OPTSET2292_EXCLUSIVE(IN6P_PKTINFO);
 1622                                         break;
 1623 
 1624                                 case IPV6_HOPLIMIT:
 1625                                 {
 1626                                         struct ip6_pktopts **optp;
 1627 
 1628                                         /* cannot mix with RFC2292 */
 1629                                         if (OPTBIT(IN6P_RFC2292)) {
 1630                                                 error = EINVAL;
 1631                                                 break;
 1632                                         }
 1633                                         INP_WLOCK(in6p);
 1634                                         if (in6p->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 1635                                                 INP_WUNLOCK(in6p);
 1636                                                 return (ECONNRESET);
 1637                                         }
 1638                                         optp = &in6p->in6p_outputopts;
 1639                                         error = ip6_pcbopt(IPV6_HOPLIMIT,
 1640                                             (u_char *)&optval, sizeof(optval),
 1641                                             optp, (td != NULL) ? td->td_ucred :
 1642                                             NULL, uproto);
 1643                                         INP_WUNLOCK(in6p);
 1644                                         break;
 1645                                 }
 1646 
 1647                                 case IPV6_RECVHOPLIMIT:
 1648                                         OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT);
 1649                                         break;
 1650 
 1651                                 case IPV6_RECVHOPOPTS:
 1652                                         OPTSET2292_EXCLUSIVE(IN6P_HOPOPTS);
 1653                                         break;
 1654 
 1655                                 case IPV6_RECVDSTOPTS:
 1656                                         OPTSET2292_EXCLUSIVE(IN6P_DSTOPTS);
 1657                                         break;
 1658 
 1659                                 case IPV6_RECVRTHDRDSTOPTS:
 1660                                         OPTSET2292_EXCLUSIVE(IN6P_RTHDRDSTOPTS);
 1661                                         break;
 1662 
 1663                                 case IPV6_RECVRTHDR:
 1664                                         OPTSET2292_EXCLUSIVE(IN6P_RTHDR);
 1665                                         break;
 1666 
 1667                                 case IPV6_RECVPATHMTU:
 1668                                         /*
 1669                                          * We ignore this option for TCP
 1670                                          * sockets.
 1671                                          * (RFC3542 leaves this case
 1672                                          * unspecified.)
 1673                                          */
 1674                                         if (uproto != IPPROTO_TCP)
 1675                                                 OPTSET(IN6P_MTU);
 1676                                         break;
 1677 
 1678                                 case IPV6_RECVFLOWID:
 1679                                         OPTSET2(INP_RECVFLOWID, optval);
 1680                                         break;
 1681 
 1682 #ifdef  RSS
 1683                                 case IPV6_RECVRSSBUCKETID:
 1684                                         OPTSET2(INP_RECVRSSBUCKETID, optval);
 1685                                         break;
 1686 #endif
 1687 
 1688                                 case IPV6_V6ONLY:
 1689                                         /*
 1690                                          * make setsockopt(IPV6_V6ONLY)
 1691                                          * available only prior to bind(2).
 1692                                          * see ipng mailing list, Jun 22 2001.
 1693                                          */
 1694                                         if (in6p->inp_lport ||
 1695                                             !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 1696                                                 error = EINVAL;
 1697                                                 break;
 1698                                         }
 1699                                         OPTSET(IN6P_IPV6_V6ONLY);
 1700                                         if (optval)
 1701                                                 in6p->inp_vflag &= ~INP_IPV4;
 1702                                         else
 1703                                                 in6p->inp_vflag |= INP_IPV4;
 1704                                         break;
 1705                                 case IPV6_RECVTCLASS:
 1706                                         /* cannot mix with RFC2292 XXX */
 1707                                         OPTSET2292_EXCLUSIVE(IN6P_TCLASS);
 1708                                         break;
 1709                                 case IPV6_AUTOFLOWLABEL:
 1710                                         OPTSET(IN6P_AUTOFLOWLABEL);
 1711                                         break;
 1712 
 1713                                 case IPV6_ORIGDSTADDR:
 1714                                         OPTSET2(INP_ORIGDSTADDR, optval);
 1715                                         break;
 1716                                 case IPV6_BINDANY:
 1717                                         OPTSET(INP_BINDANY);
 1718                                         break;
 1719 
 1720                                 case IPV6_BINDMULTI:
 1721                                         OPTSET2(INP_BINDMULTI, optval);
 1722                                         break;
 1723 #ifdef  RSS
 1724                                 case IPV6_RSS_LISTEN_BUCKET:
 1725                                         if ((optval >= 0) &&
 1726                                             (optval < rss_getnumbuckets())) {
 1727                                                 INP_WLOCK(in6p);
 1728                                                 in6p->inp_rss_listen_bucket = optval;
 1729                                                 OPTSET2_N(INP_RSS_BUCKET_SET, 1);
 1730                                                 INP_WUNLOCK(in6p);
 1731                                         } else {
 1732                                                 error = EINVAL;
 1733                                         }
 1734                                         break;
 1735 #endif
 1736                                 }
 1737                                 break;
 1738 
 1739                         case IPV6_TCLASS:
 1740                         case IPV6_DONTFRAG:
 1741                         case IPV6_USE_MIN_MTU:
 1742                         case IPV6_PREFER_TEMPADDR:
 1743                                 if (optlen != sizeof(optval)) {
 1744                                         error = EINVAL;
 1745                                         break;
 1746                                 }
 1747                                 error = sooptcopyin(sopt, &optval,
 1748                                         sizeof optval, sizeof optval);
 1749                                 if (error)
 1750                                         break;
 1751                                 {
 1752                                         struct ip6_pktopts **optp;
 1753                                         INP_WLOCK(in6p);
 1754                                         if (in6p->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 1755                                                 INP_WUNLOCK(in6p);
 1756                                                 return (ECONNRESET);
 1757                                         }
 1758                                         optp = &in6p->in6p_outputopts;
 1759                                         error = ip6_pcbopt(optname,
 1760                                             (u_char *)&optval, sizeof(optval),
 1761                                             optp, (td != NULL) ? td->td_ucred :
 1762                                             NULL, uproto);
 1763                                         INP_WUNLOCK(in6p);
 1764                                         break;
 1765                                 }
 1766 
 1767                         case IPV6_2292PKTINFO:
 1768                         case IPV6_2292HOPLIMIT:
 1769                         case IPV6_2292HOPOPTS:
 1770                         case IPV6_2292DSTOPTS:
 1771                         case IPV6_2292RTHDR:
 1772                                 /* RFC 2292 */
 1773                                 if (optlen != sizeof(int)) {
 1774                                         error = EINVAL;
 1775                                         break;
 1776                                 }
 1777                                 error = sooptcopyin(sopt, &optval,
 1778                                         sizeof optval, sizeof optval);
 1779                                 if (error)
 1780                                         break;
 1781                                 switch (optname) {
 1782                                 case IPV6_2292PKTINFO:
 1783                                         OPTSET2292(IN6P_PKTINFO);
 1784                                         break;
 1785                                 case IPV6_2292HOPLIMIT:
 1786                                         OPTSET2292(IN6P_HOPLIMIT);
 1787                                         break;
 1788                                 case IPV6_2292HOPOPTS:
 1789                                         /*
 1790                                          * Check super-user privilege.
 1791                                          * See comments for IPV6_RECVHOPOPTS.
 1792                                          */
 1793                                         if (td != NULL) {
 1794                                                 error = priv_check(td,
 1795                                                     PRIV_NETINET_SETHDROPTS);
 1796                                                 if (error)
 1797                                                         return (error);
 1798                                         }
 1799                                         OPTSET2292(IN6P_HOPOPTS);
 1800                                         break;
 1801                                 case IPV6_2292DSTOPTS:
 1802                                         if (td != NULL) {
 1803                                                 error = priv_check(td,
 1804                                                     PRIV_NETINET_SETHDROPTS);
 1805                                                 if (error)
 1806                                                         return (error);
 1807                                         }
 1808                                         OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
 1809                                         break;
 1810                                 case IPV6_2292RTHDR:
 1811                                         OPTSET2292(IN6P_RTHDR);
 1812                                         break;
 1813                                 }
 1814                                 break;
 1815                         case IPV6_PKTINFO:
 1816                         case IPV6_HOPOPTS:
 1817                         case IPV6_RTHDR:
 1818                         case IPV6_DSTOPTS:
 1819                         case IPV6_RTHDRDSTOPTS:
 1820                         case IPV6_NEXTHOP:
 1821                         {
 1822                                 /* new advanced API (RFC3542) */
 1823                                 u_char *optbuf;
 1824                                 u_char optbuf_storage[MCLBYTES];
 1825                                 int optlen;
 1826                                 struct ip6_pktopts **optp;
 1827 
 1828                                 /* cannot mix with RFC2292 */
 1829                                 if (OPTBIT(IN6P_RFC2292)) {
 1830                                         error = EINVAL;
 1831                                         break;
 1832                                 }
 1833 
 1834                                 /*
 1835                                  * We only ensure valsize is not too large
 1836                                  * here.  Further validation will be done
 1837                                  * later.
 1838                                  */
 1839                                 error = sooptcopyin(sopt, optbuf_storage,
 1840                                     sizeof(optbuf_storage), 0);
 1841                                 if (error)
 1842                                         break;
 1843                                 optlen = sopt->sopt_valsize;
 1844                                 optbuf = optbuf_storage;
 1845                                 INP_WLOCK(in6p);
 1846                                 if (in6p->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 1847                                         INP_WUNLOCK(in6p);
 1848                                         return (ECONNRESET);
 1849                                 }
 1850                                 optp = &in6p->in6p_outputopts;
 1851                                 error = ip6_pcbopt(optname, optbuf, optlen,
 1852                                     optp, (td != NULL) ? td->td_ucred : NULL,
 1853                                     uproto);
 1854                                 INP_WUNLOCK(in6p);
 1855                                 break;
 1856                         }
 1857 #undef OPTSET
 1858 
 1859                         case IPV6_MULTICAST_IF:
 1860                         case IPV6_MULTICAST_HOPS:
 1861                         case IPV6_MULTICAST_LOOP:
 1862                         case IPV6_JOIN_GROUP:
 1863                         case IPV6_LEAVE_GROUP:
 1864                         case IPV6_MSFILTER:
 1865                         case MCAST_BLOCK_SOURCE:
 1866                         case MCAST_UNBLOCK_SOURCE:
 1867                         case MCAST_JOIN_GROUP:
 1868                         case MCAST_LEAVE_GROUP:
 1869                         case MCAST_JOIN_SOURCE_GROUP:
 1870                         case MCAST_LEAVE_SOURCE_GROUP:
 1871                                 error = ip6_setmoptions(in6p, sopt);
 1872                                 break;
 1873 
 1874                         case IPV6_PORTRANGE:
 1875                                 error = sooptcopyin(sopt, &optval,
 1876                                     sizeof optval, sizeof optval);
 1877                                 if (error)
 1878                                         break;
 1879 
 1880                                 INP_WLOCK(in6p);
 1881                                 switch (optval) {
 1882                                 case IPV6_PORTRANGE_DEFAULT:
 1883                                         in6p->inp_flags &= ~(INP_LOWPORT);
 1884                                         in6p->inp_flags &= ~(INP_HIGHPORT);
 1885                                         break;
 1886 
 1887                                 case IPV6_PORTRANGE_HIGH:
 1888                                         in6p->inp_flags &= ~(INP_LOWPORT);
 1889                                         in6p->inp_flags |= INP_HIGHPORT;
 1890                                         break;
 1891 
 1892                                 case IPV6_PORTRANGE_LOW:
 1893                                         in6p->inp_flags &= ~(INP_HIGHPORT);
 1894                                         in6p->inp_flags |= INP_LOWPORT;
 1895                                         break;
 1896 
 1897                                 default:
 1898                                         error = EINVAL;
 1899                                         break;
 1900                                 }
 1901                                 INP_WUNLOCK(in6p);
 1902                                 break;
 1903 
 1904 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 1905                         case IPV6_IPSEC_POLICY:
 1906                                 if (IPSEC_ENABLED(ipv6)) {
 1907                                         error = IPSEC_PCBCTL(ipv6, in6p, sopt);
 1908                                         break;
 1909                                 }
 1910                                 /* FALLTHROUGH */
 1911 #endif /* IPSEC */
 1912 
 1913                         default:
 1914                                 error = ENOPROTOOPT;
 1915                                 break;
 1916                         }
 1917                         break;
 1918 
 1919                 case SOPT_GET:
 1920                         switch (optname) {
 1921 
 1922                         case IPV6_2292PKTOPTIONS:
 1923 #ifdef IPV6_PKTOPTIONS
 1924                         case IPV6_PKTOPTIONS:
 1925 #endif
 1926                                 /*
 1927                                  * RFC3542 (effectively) deprecated the
 1928                                  * semantics of the 2292-style pktoptions.
 1929                                  * Since it was not reliable in nature (i.e.,
 1930                                  * applications had to expect the lack of some
 1931                                  * information after all), it would make sense
 1932                                  * to simplify this part by always returning
 1933                                  * empty data.
 1934                                  */
 1935                                 sopt->sopt_valsize = 0;
 1936                                 break;
 1937 
 1938                         case IPV6_RECVHOPOPTS:
 1939                         case IPV6_RECVDSTOPTS:
 1940                         case IPV6_RECVRTHDRDSTOPTS:
 1941                         case IPV6_UNICAST_HOPS:
 1942                         case IPV6_RECVPKTINFO:
 1943                         case IPV6_RECVHOPLIMIT:
 1944                         case IPV6_RECVRTHDR:
 1945                         case IPV6_RECVPATHMTU:
 1946 
 1947                         case IPV6_V6ONLY:
 1948                         case IPV6_PORTRANGE:
 1949                         case IPV6_RECVTCLASS:
 1950                         case IPV6_AUTOFLOWLABEL:
 1951                         case IPV6_BINDANY:
 1952                         case IPV6_FLOWID:
 1953                         case IPV6_FLOWTYPE:
 1954                         case IPV6_RECVFLOWID:
 1955 #ifdef  RSS
 1956                         case IPV6_RSSBUCKETID:
 1957                         case IPV6_RECVRSSBUCKETID:
 1958 #endif
 1959                         case IPV6_BINDMULTI:
 1960                                 switch (optname) {
 1961 
 1962                                 case IPV6_RECVHOPOPTS:
 1963                                         optval = OPTBIT(IN6P_HOPOPTS);
 1964                                         break;
 1965 
 1966                                 case IPV6_RECVDSTOPTS:
 1967                                         optval = OPTBIT(IN6P_DSTOPTS);
 1968                                         break;
 1969 
 1970                                 case IPV6_RECVRTHDRDSTOPTS:
 1971                                         optval = OPTBIT(IN6P_RTHDRDSTOPTS);
 1972                                         break;
 1973 
 1974                                 case IPV6_UNICAST_HOPS:
 1975                                         optval = in6p->in6p_hops;
 1976                                         break;
 1977 
 1978                                 case IPV6_RECVPKTINFO:
 1979                                         optval = OPTBIT(IN6P_PKTINFO);
 1980                                         break;
 1981 
 1982                                 case IPV6_RECVHOPLIMIT:
 1983                                         optval = OPTBIT(IN6P_HOPLIMIT);
 1984                                         break;
 1985 
 1986                                 case IPV6_RECVRTHDR:
 1987                                         optval = OPTBIT(IN6P_RTHDR);
 1988                                         break;
 1989 
 1990                                 case IPV6_RECVPATHMTU:
 1991                                         optval = OPTBIT(IN6P_MTU);
 1992                                         break;
 1993 
 1994                                 case IPV6_V6ONLY:
 1995                                         optval = OPTBIT(IN6P_IPV6_V6ONLY);
 1996                                         break;
 1997 
 1998                                 case IPV6_PORTRANGE:
 1999                                     {
 2000                                         int flags;
 2001                                         flags = in6p->inp_flags;
 2002                                         if (flags & INP_HIGHPORT)
 2003                                                 optval = IPV6_PORTRANGE_HIGH;
 2004                                         else if (flags & INP_LOWPORT)
 2005                                                 optval = IPV6_PORTRANGE_LOW;
 2006                                         else
 2007                                                 optval = 0;
 2008                                         break;
 2009                                     }
 2010                                 case IPV6_RECVTCLASS:
 2011                                         optval = OPTBIT(IN6P_TCLASS);
 2012                                         break;
 2013 
 2014                                 case IPV6_AUTOFLOWLABEL:
 2015                                         optval = OPTBIT(IN6P_AUTOFLOWLABEL);
 2016                                         break;
 2017 
 2018                                 case IPV6_ORIGDSTADDR:
 2019                                         optval = OPTBIT2(INP_ORIGDSTADDR);
 2020                                         break;
 2021 
 2022                                 case IPV6_BINDANY:
 2023                                         optval = OPTBIT(INP_BINDANY);
 2024                                         break;
 2025 
 2026                                 case IPV6_FLOWID:
 2027                                         optval = in6p->inp_flowid;
 2028                                         break;
 2029 
 2030                                 case IPV6_FLOWTYPE:
 2031                                         optval = in6p->inp_flowtype;
 2032                                         break;
 2033 
 2034                                 case IPV6_RECVFLOWID:
 2035                                         optval = OPTBIT2(INP_RECVFLOWID);
 2036                                         break;
 2037 #ifdef  RSS
 2038                                 case IPV6_RSSBUCKETID:
 2039                                         retval =
 2040                                             rss_hash2bucket(in6p->inp_flowid,
 2041                                             in6p->inp_flowtype,
 2042                                             &rss_bucket);
 2043                                         if (retval == 0)
 2044                                                 optval = rss_bucket;
 2045                                         else
 2046                                                 error = EINVAL;
 2047                                         break;
 2048 
 2049                                 case IPV6_RECVRSSBUCKETID:
 2050                                         optval = OPTBIT2(INP_RECVRSSBUCKETID);
 2051                                         break;
 2052 #endif
 2053 
 2054                                 case IPV6_BINDMULTI:
 2055                                         optval = OPTBIT2(INP_BINDMULTI);
 2056                                         break;
 2057 
 2058                                 }
 2059                                 if (error)
 2060                                         break;
 2061                                 error = sooptcopyout(sopt, &optval,
 2062                                         sizeof optval);
 2063                                 break;
 2064 
 2065                         case IPV6_PATHMTU:
 2066                         {
 2067                                 u_long pmtu = 0;
 2068                                 struct ip6_mtuinfo mtuinfo;
 2069                                 struct in6_addr addr;
 2070 
 2071                                 if (!(so->so_state & SS_ISCONNECTED))
 2072                                         return (ENOTCONN);
 2073                                 /*
 2074                                  * XXX: we dot not consider the case of source
 2075                                  * routing, or optional information to specify
 2076                                  * the outgoing interface.
 2077                                  * Copy faddr out of in6p to avoid holding lock
 2078                                  * on inp during route lookup.
 2079                                  */
 2080                                 INP_RLOCK(in6p);
 2081                                 bcopy(&in6p->in6p_faddr, &addr, sizeof(addr));
 2082                                 INP_RUNLOCK(in6p);
 2083                                 error = ip6_getpmtu_ctl(so->so_fibnum,
 2084                                     &addr, &pmtu);
 2085                                 if (error)
 2086                                         break;
 2087                                 if (pmtu > IPV6_MAXPACKET)
 2088                                         pmtu = IPV6_MAXPACKET;
 2089 
 2090                                 bzero(&mtuinfo, sizeof(mtuinfo));
 2091                                 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
 2092                                 optdata = (void *)&mtuinfo;
 2093                                 optdatalen = sizeof(mtuinfo);
 2094                                 error = sooptcopyout(sopt, optdata,
 2095                                     optdatalen);
 2096                                 break;
 2097                         }
 2098 
 2099                         case IPV6_2292PKTINFO:
 2100                         case IPV6_2292HOPLIMIT:
 2101                         case IPV6_2292HOPOPTS:
 2102                         case IPV6_2292RTHDR:
 2103                         case IPV6_2292DSTOPTS:
 2104                                 switch (optname) {
 2105                                 case IPV6_2292PKTINFO:
 2106                                         optval = OPTBIT(IN6P_PKTINFO);
 2107                                         break;
 2108                                 case IPV6_2292HOPLIMIT:
 2109                                         optval = OPTBIT(IN6P_HOPLIMIT);
 2110                                         break;
 2111                                 case IPV6_2292HOPOPTS:
 2112                                         optval = OPTBIT(IN6P_HOPOPTS);
 2113                                         break;
 2114                                 case IPV6_2292RTHDR:
 2115                                         optval = OPTBIT(IN6P_RTHDR);
 2116                                         break;
 2117                                 case IPV6_2292DSTOPTS:
 2118                                         optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
 2119                                         break;
 2120                                 }
 2121                                 error = sooptcopyout(sopt, &optval,
 2122                                     sizeof optval);
 2123                                 break;
 2124                         case IPV6_PKTINFO:
 2125                         case IPV6_HOPOPTS:
 2126                         case IPV6_RTHDR:
 2127                         case IPV6_DSTOPTS:
 2128                         case IPV6_RTHDRDSTOPTS:
 2129                         case IPV6_NEXTHOP:
 2130                         case IPV6_TCLASS:
 2131                         case IPV6_DONTFRAG:
 2132                         case IPV6_USE_MIN_MTU:
 2133                         case IPV6_PREFER_TEMPADDR:
 2134                                 error = ip6_getpcbopt(in6p, optname, sopt);
 2135                                 break;
 2136 
 2137                         case IPV6_MULTICAST_IF:
 2138                         case IPV6_MULTICAST_HOPS:
 2139                         case IPV6_MULTICAST_LOOP:
 2140                         case IPV6_MSFILTER:
 2141                                 error = ip6_getmoptions(in6p, sopt);
 2142                                 break;
 2143 
 2144 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 2145                         case IPV6_IPSEC_POLICY:
 2146                                 if (IPSEC_ENABLED(ipv6)) {
 2147                                         error = IPSEC_PCBCTL(ipv6, in6p, sopt);
 2148                                         break;
 2149                                 }
 2150                                 /* FALLTHROUGH */
 2151 #endif /* IPSEC */
 2152                         default:
 2153                                 error = ENOPROTOOPT;
 2154                                 break;
 2155                         }
 2156                         break;
 2157                 }
 2158         }
 2159         return (error);
 2160 }
 2161 
 2162 int
 2163 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
 2164 {
 2165         int error = 0, optval, optlen;
 2166         const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
 2167         struct inpcb *in6p = sotoinpcb(so);
 2168         int level, op, optname;
 2169 
 2170         level = sopt->sopt_level;
 2171         op = sopt->sopt_dir;
 2172         optname = sopt->sopt_name;
 2173         optlen = sopt->sopt_valsize;
 2174 
 2175         if (level != IPPROTO_IPV6) {
 2176                 return (EINVAL);
 2177         }
 2178 
 2179         switch (optname) {
 2180         case IPV6_CHECKSUM:
 2181                 /*
 2182                  * For ICMPv6 sockets, no modification allowed for checksum
 2183                  * offset, permit "no change" values to help existing apps.
 2184                  *
 2185                  * RFC3542 says: "An attempt to set IPV6_CHECKSUM
 2186                  * for an ICMPv6 socket will fail."
 2187                  * The current behavior does not meet RFC3542.
 2188                  */
 2189                 switch (op) {
 2190                 case SOPT_SET:
 2191                         if (optlen != sizeof(int)) {
 2192                                 error = EINVAL;
 2193                                 break;
 2194                         }
 2195                         error = sooptcopyin(sopt, &optval, sizeof(optval),
 2196                                             sizeof(optval));
 2197                         if (error)
 2198                                 break;
 2199                         if ((optval % 2) != 0) {
 2200                                 /* the API assumes even offset values */
 2201                                 error = EINVAL;
 2202                         } else if (so->so_proto->pr_protocol ==
 2203                             IPPROTO_ICMPV6) {
 2204                                 if (optval != icmp6off)
 2205                                         error = EINVAL;
 2206                         } else
 2207                                 in6p->in6p_cksum = optval;
 2208                         break;
 2209 
 2210                 case SOPT_GET:
 2211                         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
 2212                                 optval = icmp6off;
 2213                         else
 2214                                 optval = in6p->in6p_cksum;
 2215 
 2216                         error = sooptcopyout(sopt, &optval, sizeof(optval));
 2217                         break;
 2218 
 2219                 default:
 2220                         error = EINVAL;
 2221                         break;
 2222                 }
 2223                 break;
 2224 
 2225         default:
 2226                 error = ENOPROTOOPT;
 2227                 break;
 2228         }
 2229 
 2230         return (error);
 2231 }
 2232 
 2233 /*
 2234  * Set up IP6 options in pcb for insertion in output packets or
 2235  * specifying behavior of outgoing packets.
 2236  */
 2237 static int
 2238 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
 2239     struct socket *so, struct sockopt *sopt)
 2240 {
 2241         struct ip6_pktopts *opt = *pktopt;
 2242         int error = 0;
 2243         struct thread *td = sopt->sopt_td;
 2244 
 2245         /* turn off any old options. */
 2246         if (opt) {
 2247 #ifdef DIAGNOSTIC
 2248                 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
 2249                     opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
 2250                     opt->ip6po_rhinfo.ip6po_rhi_rthdr)
 2251                         printf("ip6_pcbopts: all specified options are cleared.\n");
 2252 #endif
 2253                 ip6_clearpktopts(opt, -1);
 2254         } else
 2255                 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
 2256         *pktopt = NULL;
 2257 
 2258         if (!m || m->m_len == 0) {
 2259                 /*
 2260                  * Only turning off any previous options, regardless of
 2261                  * whether the opt is just created or given.
 2262                  */
 2263                 free(opt, M_IP6OPT);
 2264                 return (0);
 2265         }
 2266 
 2267         /*  set options specified by user. */
 2268         if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
 2269             td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
 2270                 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
 2271                 free(opt, M_IP6OPT);
 2272                 return (error);
 2273         }
 2274         *pktopt = opt;
 2275         return (0);
 2276 }
 2277 
 2278 /*
 2279  * initialize ip6_pktopts.  beware that there are non-zero default values in
 2280  * the struct.
 2281  */
 2282 void
 2283 ip6_initpktopts(struct ip6_pktopts *opt)
 2284 {
 2285 
 2286         bzero(opt, sizeof(*opt));
 2287         opt->ip6po_hlim = -1;   /* -1 means default hop limit */
 2288         opt->ip6po_tclass = -1; /* -1 means default traffic class */
 2289         opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
 2290         opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
 2291 }
 2292 
 2293 static int
 2294 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
 2295     struct ucred *cred, int uproto)
 2296 {
 2297         struct ip6_pktopts *opt;
 2298 
 2299         if (*pktopt == NULL) {
 2300                 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
 2301                     M_NOWAIT);
 2302                 if (*pktopt == NULL)
 2303                         return (ENOBUFS);
 2304                 ip6_initpktopts(*pktopt);
 2305         }
 2306         opt = *pktopt;
 2307 
 2308         return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
 2309 }
 2310 
 2311 #define GET_PKTOPT_VAR(field, lenexpr) do {                                     \
 2312         if (pktopt && pktopt->field) {                                          \
 2313                 INP_RUNLOCK(in6p);                                              \
 2314                 optdata = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK);         \
 2315                 malloc_optdata = true;                                          \
 2316                 INP_RLOCK(in6p);                                                \
 2317                 if (in6p->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {           \
 2318                         INP_RUNLOCK(in6p);                                      \
 2319                         free(optdata, M_TEMP);                                  \
 2320                         return (ECONNRESET);                                    \
 2321                 }                                                               \
 2322                 pktopt = in6p->in6p_outputopts;                                 \
 2323                 if (pktopt && pktopt->field) {                                  \
 2324                         optdatalen = min(lenexpr, sopt->sopt_valsize);          \
 2325                         bcopy(&pktopt->field, optdata, optdatalen);             \
 2326                 } else {                                                        \
 2327                         free(optdata, M_TEMP);                                  \
 2328                         optdata = NULL;                                         \
 2329                         malloc_optdata = false;                                 \
 2330                 }                                                               \
 2331         }                                                                       \
 2332 } while(0)
 2333 
 2334 #define GET_PKTOPT_EXT_HDR(field) GET_PKTOPT_VAR(field,                         \
 2335         (((struct ip6_ext *)pktopt->field)->ip6e_len + 1) << 3)
 2336 
 2337 #define GET_PKTOPT_SOCKADDR(field) GET_PKTOPT_VAR(field,                        \
 2338         pktopt->field->sa_len)
 2339 
 2340 static int
 2341 ip6_getpcbopt(struct inpcb *in6p, int optname, struct sockopt *sopt)
 2342 {
 2343         void *optdata = NULL;
 2344         bool malloc_optdata = false;
 2345         int optdatalen = 0;
 2346         int error = 0;
 2347         struct in6_pktinfo null_pktinfo;
 2348         int deftclass = 0, on;
 2349         int defminmtu = IP6PO_MINMTU_MCASTONLY;
 2350         int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
 2351         struct ip6_pktopts *pktopt;
 2352 
 2353         INP_RLOCK(in6p);
 2354         pktopt = in6p->in6p_outputopts;
 2355 
 2356         switch (optname) {
 2357         case IPV6_PKTINFO:
 2358                 optdata = (void *)&null_pktinfo;
 2359                 if (pktopt && pktopt->ip6po_pktinfo) {
 2360                         bcopy(pktopt->ip6po_pktinfo, &null_pktinfo,
 2361                             sizeof(null_pktinfo));
 2362                         in6_clearscope(&null_pktinfo.ipi6_addr);
 2363                 } else {
 2364                         /* XXX: we don't have to do this every time... */
 2365                         bzero(&null_pktinfo, sizeof(null_pktinfo));
 2366                 }
 2367                 optdatalen = sizeof(struct in6_pktinfo);
 2368                 break;
 2369         case IPV6_TCLASS:
 2370                 if (pktopt && pktopt->ip6po_tclass >= 0)
 2371                         deftclass = pktopt->ip6po_tclass;
 2372                 optdata = (void *)&deftclass;
 2373                 optdatalen = sizeof(int);
 2374                 break;
 2375         case IPV6_HOPOPTS:
 2376                 GET_PKTOPT_EXT_HDR(ip6po_hbh);
 2377                 break;
 2378         case IPV6_RTHDR:
 2379                 GET_PKTOPT_EXT_HDR(ip6po_rthdr);
 2380                 break;
 2381         case IPV6_RTHDRDSTOPTS:
 2382                 GET_PKTOPT_EXT_HDR(ip6po_dest1);
 2383                 break;
 2384         case IPV6_DSTOPTS:
 2385                 GET_PKTOPT_EXT_HDR(ip6po_dest2);
 2386                 break;
 2387         case IPV6_NEXTHOP:
 2388                 GET_PKTOPT_SOCKADDR(ip6po_nexthop);
 2389                 break;
 2390         case IPV6_USE_MIN_MTU:
 2391                 if (pktopt)
 2392                         defminmtu = pktopt->ip6po_minmtu;
 2393                 optdata = (void *)&defminmtu;
 2394                 optdatalen = sizeof(int);
 2395                 break;
 2396         case IPV6_DONTFRAG:
 2397                 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
 2398                         on = 1;
 2399                 else
 2400                         on = 0;
 2401                 optdata = (void *)&on;
 2402                 optdatalen = sizeof(on);
 2403                 break;
 2404         case IPV6_PREFER_TEMPADDR:
 2405                 if (pktopt)
 2406                         defpreftemp = pktopt->ip6po_prefer_tempaddr;
 2407                 optdata = (void *)&defpreftemp;
 2408                 optdatalen = sizeof(int);
 2409                 break;
 2410         default:                /* should not happen */
 2411 #ifdef DIAGNOSTIC
 2412                 panic("ip6_getpcbopt: unexpected option\n");
 2413 #endif
 2414                 INP_RUNLOCK(in6p);
 2415                 return (ENOPROTOOPT);
 2416         }
 2417         INP_RUNLOCK(in6p);
 2418 
 2419         error = sooptcopyout(sopt, optdata, optdatalen);
 2420         if (malloc_optdata)
 2421                 free(optdata, M_TEMP);
 2422 
 2423         return (error);
 2424 }
 2425 
 2426 void
 2427 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
 2428 {
 2429         if (pktopt == NULL)
 2430                 return;
 2431 
 2432         if (optname == -1 || optname == IPV6_PKTINFO) {
 2433                 if (pktopt->ip6po_pktinfo)
 2434                         free(pktopt->ip6po_pktinfo, M_IP6OPT);
 2435                 pktopt->ip6po_pktinfo = NULL;
 2436         }
 2437         if (optname == -1 || optname == IPV6_HOPLIMIT)
 2438                 pktopt->ip6po_hlim = -1;
 2439         if (optname == -1 || optname == IPV6_TCLASS)
 2440                 pktopt->ip6po_tclass = -1;
 2441         if (optname == -1 || optname == IPV6_NEXTHOP) {
 2442                 if (pktopt->ip6po_nextroute.ro_rt) {
 2443                         RTFREE(pktopt->ip6po_nextroute.ro_rt);
 2444                         pktopt->ip6po_nextroute.ro_rt = NULL;
 2445                 }
 2446                 if (pktopt->ip6po_nexthop)
 2447                         free(pktopt->ip6po_nexthop, M_IP6OPT);
 2448                 pktopt->ip6po_nexthop = NULL;
 2449         }
 2450         if (optname == -1 || optname == IPV6_HOPOPTS) {
 2451                 if (pktopt->ip6po_hbh)
 2452                         free(pktopt->ip6po_hbh, M_IP6OPT);
 2453                 pktopt->ip6po_hbh = NULL;
 2454         }
 2455         if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
 2456                 if (pktopt->ip6po_dest1)
 2457                         free(pktopt->ip6po_dest1, M_IP6OPT);
 2458                 pktopt->ip6po_dest1 = NULL;
 2459         }
 2460         if (optname == -1 || optname == IPV6_RTHDR) {
 2461                 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
 2462                         free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
 2463                 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
 2464                 if (pktopt->ip6po_route.ro_rt) {
 2465                         RTFREE(pktopt->ip6po_route.ro_rt);
 2466                         pktopt->ip6po_route.ro_rt = NULL;
 2467                 }
 2468         }
 2469         if (optname == -1 || optname == IPV6_DSTOPTS) {
 2470                 if (pktopt->ip6po_dest2)
 2471                         free(pktopt->ip6po_dest2, M_IP6OPT);
 2472                 pktopt->ip6po_dest2 = NULL;
 2473         }
 2474 }
 2475 
 2476 #define PKTOPT_EXTHDRCPY(type) \
 2477 do {\
 2478         if (src->type) {\
 2479                 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
 2480                 dst->type = malloc(hlen, M_IP6OPT, canwait);\
 2481                 if (dst->type == NULL)\
 2482                         goto bad;\
 2483                 bcopy(src->type, dst->type, hlen);\
 2484         }\
 2485 } while (/*CONSTCOND*/ 0)
 2486 
 2487 static int
 2488 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
 2489 {
 2490         if (dst == NULL || src == NULL)  {
 2491                 printf("ip6_clearpktopts: invalid argument\n");
 2492                 return (EINVAL);
 2493         }
 2494 
 2495         dst->ip6po_hlim = src->ip6po_hlim;
 2496         dst->ip6po_tclass = src->ip6po_tclass;
 2497         dst->ip6po_flags = src->ip6po_flags;
 2498         dst->ip6po_minmtu = src->ip6po_minmtu;
 2499         dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
 2500         if (src->ip6po_pktinfo) {
 2501                 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
 2502                     M_IP6OPT, canwait);
 2503                 if (dst->ip6po_pktinfo == NULL)
 2504                         goto bad;
 2505                 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
 2506         }
 2507         if (src->ip6po_nexthop) {
 2508                 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
 2509                     M_IP6OPT, canwait);
 2510                 if (dst->ip6po_nexthop == NULL)
 2511                         goto bad;
 2512                 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
 2513                     src->ip6po_nexthop->sa_len);
 2514         }
 2515         PKTOPT_EXTHDRCPY(ip6po_hbh);
 2516         PKTOPT_EXTHDRCPY(ip6po_dest1);
 2517         PKTOPT_EXTHDRCPY(ip6po_dest2);
 2518         PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
 2519         return (0);
 2520 
 2521   bad:
 2522         ip6_clearpktopts(dst, -1);
 2523         return (ENOBUFS);
 2524 }
 2525 #undef PKTOPT_EXTHDRCPY
 2526 
 2527 struct ip6_pktopts *
 2528 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
 2529 {
 2530         int error;
 2531         struct ip6_pktopts *dst;
 2532 
 2533         dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
 2534         if (dst == NULL)
 2535                 return (NULL);
 2536         ip6_initpktopts(dst);
 2537 
 2538         if ((error = copypktopts(dst, src, canwait)) != 0) {
 2539                 free(dst, M_IP6OPT);
 2540                 return (NULL);
 2541         }
 2542 
 2543         return (dst);
 2544 }
 2545 
 2546 void
 2547 ip6_freepcbopts(struct ip6_pktopts *pktopt)
 2548 {
 2549         if (pktopt == NULL)
 2550                 return;
 2551 
 2552         ip6_clearpktopts(pktopt, -1);
 2553 
 2554         free(pktopt, M_IP6OPT);
 2555 }
 2556 
 2557 /*
 2558  * Set IPv6 outgoing packet options based on advanced API.
 2559  */
 2560 int
 2561 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
 2562     struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
 2563 {
 2564         struct cmsghdr *cm = NULL;
 2565 
 2566         if (control == NULL || opt == NULL)
 2567                 return (EINVAL);
 2568 
 2569         ip6_initpktopts(opt);
 2570         if (stickyopt) {
 2571                 int error;
 2572 
 2573                 /*
 2574                  * If stickyopt is provided, make a local copy of the options
 2575                  * for this particular packet, then override them by ancillary
 2576                  * objects.
 2577                  * XXX: copypktopts() does not copy the cached route to a next
 2578                  * hop (if any).  This is not very good in terms of efficiency,
 2579                  * but we can allow this since this option should be rarely
 2580                  * used.
 2581                  */
 2582                 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
 2583                         return (error);
 2584         }
 2585 
 2586         /*
 2587          * XXX: Currently, we assume all the optional information is stored
 2588          * in a single mbuf.
 2589          */
 2590         if (control->m_next)
 2591                 return (EINVAL);
 2592 
 2593         for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
 2594             control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
 2595                 int error;
 2596 
 2597                 if (control->m_len < CMSG_LEN(0))
 2598                         return (EINVAL);
 2599 
 2600                 cm = mtod(control, struct cmsghdr *);
 2601                 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
 2602                         return (EINVAL);
 2603                 if (cm->cmsg_level != IPPROTO_IPV6)
 2604                         continue;
 2605 
 2606                 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
 2607                     cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
 2608                 if (error)
 2609                         return (error);
 2610         }
 2611 
 2612         return (0);
 2613 }
 2614 
 2615 /*
 2616  * Set a particular packet option, as a sticky option or an ancillary data
 2617  * item.  "len" can be 0 only when it's a sticky option.
 2618  * We have 4 cases of combination of "sticky" and "cmsg":
 2619  * "sticky=0, cmsg=0": impossible
 2620  * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
 2621  * "sticky=1, cmsg=0": RFC3542 socket option
 2622  * "sticky=1, cmsg=1": RFC2292 socket option
 2623  */
 2624 static int
 2625 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
 2626     struct ucred *cred, int sticky, int cmsg, int uproto)
 2627 {
 2628         int minmtupolicy, preftemp;
 2629         int error;
 2630 
 2631         if (!sticky && !cmsg) {
 2632 #ifdef DIAGNOSTIC
 2633                 printf("ip6_setpktopt: impossible case\n");
 2634 #endif
 2635                 return (EINVAL);
 2636         }
 2637 
 2638         /*
 2639          * IPV6_2292xxx is for backward compatibility to RFC2292, and should
 2640          * not be specified in the context of RFC3542.  Conversely,
 2641          * RFC3542 types should not be specified in the context of RFC2292.
 2642          */
 2643         if (!cmsg) {
 2644                 switch (optname) {
 2645                 case IPV6_2292PKTINFO:
 2646                 case IPV6_2292HOPLIMIT:
 2647                 case IPV6_2292NEXTHOP:
 2648                 case IPV6_2292HOPOPTS:
 2649                 case IPV6_2292DSTOPTS:
 2650                 case IPV6_2292RTHDR:
 2651                 case IPV6_2292PKTOPTIONS:
 2652                         return (ENOPROTOOPT);
 2653                 }
 2654         }
 2655         if (sticky && cmsg) {
 2656                 switch (optname) {
 2657                 case IPV6_PKTINFO:
 2658                 case IPV6_HOPLIMIT:
 2659                 case IPV6_NEXTHOP:
 2660                 case IPV6_HOPOPTS:
 2661                 case IPV6_DSTOPTS:
 2662                 case IPV6_RTHDRDSTOPTS:
 2663                 case IPV6_RTHDR:
 2664                 case IPV6_USE_MIN_MTU:
 2665                 case IPV6_DONTFRAG:
 2666                 case IPV6_TCLASS:
 2667                 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
 2668                         return (ENOPROTOOPT);
 2669                 }
 2670         }
 2671 
 2672         switch (optname) {
 2673         case IPV6_2292PKTINFO:
 2674         case IPV6_PKTINFO:
 2675         {
 2676                 struct ifnet *ifp = NULL;
 2677                 struct in6_pktinfo *pktinfo;
 2678 
 2679                 if (len != sizeof(struct in6_pktinfo))
 2680                         return (EINVAL);
 2681 
 2682                 pktinfo = (struct in6_pktinfo *)buf;
 2683 
 2684                 /*
 2685                  * An application can clear any sticky IPV6_PKTINFO option by
 2686                  * doing a "regular" setsockopt with ipi6_addr being
 2687                  * in6addr_any and ipi6_ifindex being zero.
 2688                  * [RFC 3542, Section 6]
 2689                  */
 2690                 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
 2691                     pktinfo->ipi6_ifindex == 0 &&
 2692                     IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
 2693                         ip6_clearpktopts(opt, optname);
 2694                         break;
 2695                 }
 2696 
 2697                 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
 2698                     sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
 2699                         return (EINVAL);
 2700                 }
 2701                 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
 2702                         return (EINVAL);
 2703                 /* validate the interface index if specified. */
 2704                 if (pktinfo->ipi6_ifindex > V_if_index)
 2705                          return (ENXIO);
 2706                 if (pktinfo->ipi6_ifindex) {
 2707                         ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
 2708                         if (ifp == NULL)
 2709                                 return (ENXIO);
 2710                 }
 2711                 if (ifp != NULL && (ifp->if_afdata[AF_INET6] == NULL ||
 2712                     (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) != 0))
 2713                         return (ENETDOWN);
 2714 
 2715                 if (ifp != NULL &&
 2716                     !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
 2717                         struct in6_ifaddr *ia;
 2718 
 2719                         in6_setscope(&pktinfo->ipi6_addr, ifp, NULL);
 2720                         ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr);
 2721                         if (ia == NULL)
 2722                                 return (EADDRNOTAVAIL);
 2723                         ifa_free(&ia->ia_ifa);
 2724                 }
 2725                 /*
 2726                  * We store the address anyway, and let in6_selectsrc()
 2727                  * validate the specified address.  This is because ipi6_addr
 2728                  * may not have enough information about its scope zone, and
 2729                  * we may need additional information (such as outgoing
 2730                  * interface or the scope zone of a destination address) to
 2731                  * disambiguate the scope.
 2732                  * XXX: the delay of the validation may confuse the
 2733                  * application when it is used as a sticky option.
 2734                  */
 2735                 if (opt->ip6po_pktinfo == NULL) {
 2736                         opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
 2737                             M_IP6OPT, M_NOWAIT);
 2738                         if (opt->ip6po_pktinfo == NULL)
 2739                                 return (ENOBUFS);
 2740                 }
 2741                 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
 2742                 break;
 2743         }
 2744 
 2745         case IPV6_2292HOPLIMIT:
 2746         case IPV6_HOPLIMIT:
 2747         {
 2748                 int *hlimp;
 2749 
 2750                 /*
 2751                  * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
 2752                  * to simplify the ordering among hoplimit options.
 2753                  */
 2754                 if (optname == IPV6_HOPLIMIT && sticky)
 2755                         return (ENOPROTOOPT);
 2756 
 2757                 if (len != sizeof(int))
 2758                         return (EINVAL);
 2759                 hlimp = (int *)buf;
 2760                 if (*hlimp < -1 || *hlimp > 255)
 2761                         return (EINVAL);
 2762 
 2763                 opt->ip6po_hlim = *hlimp;
 2764                 break;
 2765         }
 2766 
 2767         case IPV6_TCLASS:
 2768         {
 2769                 int tclass;
 2770 
 2771                 if (len != sizeof(int))
 2772                         return (EINVAL);
 2773                 tclass = *(int *)buf;
 2774                 if (tclass < -1 || tclass > 255)
 2775                         return (EINVAL);
 2776 
 2777                 opt->ip6po_tclass = tclass;
 2778                 break;
 2779         }
 2780 
 2781         case IPV6_2292NEXTHOP:
 2782         case IPV6_NEXTHOP:
 2783                 if (cred != NULL) {
 2784                         error = priv_check_cred(cred,
 2785                             PRIV_NETINET_SETHDROPTS, 0);
 2786                         if (error)
 2787                                 return (error);
 2788                 }
 2789 
 2790                 if (len == 0) { /* just remove the option */
 2791                         ip6_clearpktopts(opt, IPV6_NEXTHOP);
 2792                         break;
 2793                 }
 2794 
 2795                 /* check if cmsg_len is large enough for sa_len */
 2796                 if (len < sizeof(struct sockaddr) || len < *buf)
 2797                         return (EINVAL);
 2798 
 2799                 switch (((struct sockaddr *)buf)->sa_family) {
 2800                 case AF_INET6:
 2801                 {
 2802                         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
 2803                         int error;
 2804 
 2805                         if (sa6->sin6_len != sizeof(struct sockaddr_in6))
 2806                                 return (EINVAL);
 2807 
 2808                         if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
 2809                             IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
 2810                                 return (EINVAL);
 2811                         }
 2812                         if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
 2813                             != 0) {
 2814                                 return (error);
 2815                         }
 2816                         break;
 2817                 }
 2818                 case AF_LINK:   /* should eventually be supported */
 2819                 default:
 2820                         return (EAFNOSUPPORT);
 2821                 }
 2822 
 2823                 /* turn off the previous option, then set the new option. */
 2824                 ip6_clearpktopts(opt, IPV6_NEXTHOP);
 2825                 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
 2826                 if (opt->ip6po_nexthop == NULL)
 2827                         return (ENOBUFS);
 2828                 bcopy(buf, opt->ip6po_nexthop, *buf);
 2829                 break;
 2830 
 2831         case IPV6_2292HOPOPTS:
 2832         case IPV6_HOPOPTS:
 2833         {
 2834                 struct ip6_hbh *hbh;
 2835                 int hbhlen;
 2836 
 2837                 /*
 2838                  * XXX: We don't allow a non-privileged user to set ANY HbH
 2839                  * options, since per-option restriction has too much
 2840                  * overhead.
 2841                  */
 2842                 if (cred != NULL) {
 2843                         error = priv_check_cred(cred,
 2844                             PRIV_NETINET_SETHDROPTS, 0);
 2845                         if (error)
 2846                                 return (error);
 2847                 }
 2848 
 2849                 if (len == 0) {
 2850                         ip6_clearpktopts(opt, IPV6_HOPOPTS);
 2851                         break;  /* just remove the option */
 2852                 }
 2853 
 2854                 /* message length validation */
 2855                 if (len < sizeof(struct ip6_hbh))
 2856                         return (EINVAL);
 2857                 hbh = (struct ip6_hbh *)buf;
 2858                 hbhlen = (hbh->ip6h_len + 1) << 3;
 2859                 if (len != hbhlen)
 2860                         return (EINVAL);
 2861 
 2862                 /* turn off the previous option, then set the new option. */
 2863                 ip6_clearpktopts(opt, IPV6_HOPOPTS);
 2864                 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
 2865                 if (opt->ip6po_hbh == NULL)
 2866                         return (ENOBUFS);
 2867                 bcopy(hbh, opt->ip6po_hbh, hbhlen);
 2868 
 2869                 break;
 2870         }
 2871 
 2872         case IPV6_2292DSTOPTS:
 2873         case IPV6_DSTOPTS:
 2874         case IPV6_RTHDRDSTOPTS:
 2875         {
 2876                 struct ip6_dest *dest, **newdest = NULL;
 2877                 int destlen;
 2878 
 2879                 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
 2880                         error = priv_check_cred(cred,
 2881                             PRIV_NETINET_SETHDROPTS, 0);
 2882                         if (error)
 2883                                 return (error);
 2884                 }
 2885 
 2886                 if (len == 0) {
 2887                         ip6_clearpktopts(opt, optname);
 2888                         break;  /* just remove the option */
 2889                 }
 2890 
 2891                 /* message length validation */
 2892                 if (len < sizeof(struct ip6_dest))
 2893                         return (EINVAL);
 2894                 dest = (struct ip6_dest *)buf;
 2895                 destlen = (dest->ip6d_len + 1) << 3;
 2896                 if (len != destlen)
 2897                         return (EINVAL);
 2898 
 2899                 /*
 2900                  * Determine the position that the destination options header
 2901                  * should be inserted; before or after the routing header.
 2902                  */
 2903                 switch (optname) {
 2904                 case IPV6_2292DSTOPTS:
 2905                         /*
 2906                          * The old advacned API is ambiguous on this point.
 2907                          * Our approach is to determine the position based
 2908                          * according to the existence of a routing header.
 2909                          * Note, however, that this depends on the order of the
 2910                          * extension headers in the ancillary data; the 1st
 2911                          * part of the destination options header must appear
 2912                          * before the routing header in the ancillary data,
 2913                          * too.
 2914                          * RFC3542 solved the ambiguity by introducing
 2915                          * separate ancillary data or option types.
 2916                          */
 2917                         if (opt->ip6po_rthdr == NULL)
 2918                                 newdest = &opt->ip6po_dest1;
 2919                         else
 2920                                 newdest = &opt->ip6po_dest2;
 2921                         break;
 2922                 case IPV6_RTHDRDSTOPTS:
 2923                         newdest = &opt->ip6po_dest1;
 2924                         break;
 2925                 case IPV6_DSTOPTS:
 2926                         newdest = &opt->ip6po_dest2;
 2927                         break;
 2928                 }
 2929 
 2930                 /* turn off the previous option, then set the new option. */
 2931                 ip6_clearpktopts(opt, optname);
 2932                 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
 2933                 if (*newdest == NULL)
 2934                         return (ENOBUFS);
 2935                 bcopy(dest, *newdest, destlen);
 2936 
 2937                 break;
 2938         }
 2939 
 2940         case IPV6_2292RTHDR:
 2941         case IPV6_RTHDR:
 2942         {
 2943                 struct ip6_rthdr *rth;
 2944                 int rthlen;
 2945 
 2946                 if (len == 0) {
 2947                         ip6_clearpktopts(opt, IPV6_RTHDR);
 2948                         break;  /* just remove the option */
 2949                 }
 2950 
 2951                 /* message length validation */
 2952                 if (len < sizeof(struct ip6_rthdr))
 2953                         return (EINVAL);
 2954                 rth = (struct ip6_rthdr *)buf;
 2955                 rthlen = (rth->ip6r_len + 1) << 3;
 2956                 if (len != rthlen)
 2957                         return (EINVAL);
 2958 
 2959                 switch (rth->ip6r_type) {
 2960                 case IPV6_RTHDR_TYPE_0:
 2961                         if (rth->ip6r_len == 0) /* must contain one addr */
 2962                                 return (EINVAL);
 2963                         if (rth->ip6r_len % 2) /* length must be even */
 2964                                 return (EINVAL);
 2965                         if (rth->ip6r_len / 2 != rth->ip6r_segleft)
 2966                                 return (EINVAL);
 2967                         break;
 2968                 default:
 2969                         return (EINVAL);        /* not supported */
 2970                 }
 2971 
 2972                 /* turn off the previous option */
 2973                 ip6_clearpktopts(opt, IPV6_RTHDR);
 2974                 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
 2975                 if (opt->ip6po_rthdr == NULL)
 2976                         return (ENOBUFS);
 2977                 bcopy(rth, opt->ip6po_rthdr, rthlen);
 2978 
 2979                 break;
 2980         }
 2981 
 2982         case IPV6_USE_MIN_MTU:
 2983                 if (len != sizeof(int))
 2984                         return (EINVAL);
 2985                 minmtupolicy = *(int *)buf;
 2986                 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
 2987                     minmtupolicy != IP6PO_MINMTU_DISABLE &&
 2988                     minmtupolicy != IP6PO_MINMTU_ALL) {
 2989                         return (EINVAL);
 2990                 }
 2991                 opt->ip6po_minmtu = minmtupolicy;
 2992                 break;
 2993 
 2994         case IPV6_DONTFRAG:
 2995                 if (len != sizeof(int))
 2996                         return (EINVAL);
 2997 
 2998                 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
 2999                         /*
 3000                          * we ignore this option for TCP sockets.
 3001                          * (RFC3542 leaves this case unspecified.)
 3002                          */
 3003                         opt->ip6po_flags &= ~IP6PO_DONTFRAG;
 3004                 } else
 3005                         opt->ip6po_flags |= IP6PO_DONTFRAG;
 3006                 break;
 3007 
 3008         case IPV6_PREFER_TEMPADDR:
 3009                 if (len != sizeof(int))
 3010                         return (EINVAL);
 3011                 preftemp = *(int *)buf;
 3012                 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
 3013                     preftemp != IP6PO_TEMPADDR_NOTPREFER &&
 3014                     preftemp != IP6PO_TEMPADDR_PREFER) {
 3015                         return (EINVAL);
 3016                 }
 3017                 opt->ip6po_prefer_tempaddr = preftemp;
 3018                 break;
 3019 
 3020         default:
 3021                 return (ENOPROTOOPT);
 3022         } /* end of switch */
 3023 
 3024         return (0);
 3025 }
 3026 
 3027 /*
 3028  * Routine called from ip6_output() to loop back a copy of an IP6 multicast
 3029  * packet to the input queue of a specified interface.  Note that this
 3030  * calls the output routine of the loopback "driver", but with an interface
 3031  * pointer that might NOT be &loif -- easier than replicating that code here.
 3032  */
 3033 void
 3034 ip6_mloopback(struct ifnet *ifp, struct mbuf *m)
 3035 {
 3036         struct mbuf *copym;
 3037         struct ip6_hdr *ip6;
 3038 
 3039         copym = m_copym(m, 0, M_COPYALL, M_NOWAIT);
 3040         if (copym == NULL)
 3041                 return;
 3042 
 3043         /*
 3044          * Make sure to deep-copy IPv6 header portion in case the data
 3045          * is in an mbuf cluster, so that we can safely override the IPv6
 3046          * header portion later.
 3047          */
 3048         if (!M_WRITABLE(copym) ||
 3049             copym->m_len < sizeof(struct ip6_hdr)) {
 3050                 copym = m_pullup(copym, sizeof(struct ip6_hdr));
 3051                 if (copym == NULL)
 3052                         return;
 3053         }
 3054         ip6 = mtod(copym, struct ip6_hdr *);
 3055         /*
 3056          * clear embedded scope identifiers if necessary.
 3057          * in6_clearscope will touch the addresses only when necessary.
 3058          */
 3059         in6_clearscope(&ip6->ip6_src);
 3060         in6_clearscope(&ip6->ip6_dst);
 3061         if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
 3062                 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 |
 3063                     CSUM_PSEUDO_HDR;
 3064                 copym->m_pkthdr.csum_data = 0xffff;
 3065         }
 3066         if_simloop(ifp, copym, AF_INET6, 0);
 3067 }
 3068 
 3069 /*
 3070  * Chop IPv6 header off from the payload.
 3071  */
 3072 static int
 3073 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
 3074 {
 3075         struct mbuf *mh;
 3076         struct ip6_hdr *ip6;
 3077 
 3078         ip6 = mtod(m, struct ip6_hdr *);
 3079         if (m->m_len > sizeof(*ip6)) {
 3080                 mh = m_gethdr(M_NOWAIT, MT_DATA);
 3081                 if (mh == NULL) {
 3082                         m_freem(m);
 3083                         return ENOBUFS;
 3084                 }
 3085                 m_move_pkthdr(mh, m);
 3086                 M_ALIGN(mh, sizeof(*ip6));
 3087                 m->m_len -= sizeof(*ip6);
 3088                 m->m_data += sizeof(*ip6);
 3089                 mh->m_next = m;
 3090                 m = mh;
 3091                 m->m_len = sizeof(*ip6);
 3092                 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
 3093         }
 3094         exthdrs->ip6e_ip6 = m;
 3095         return 0;
 3096 }
 3097 
 3098 /*
 3099  * Compute IPv6 extension header length.
 3100  */
 3101 int
 3102 ip6_optlen(struct inpcb *in6p)
 3103 {
 3104         int len;
 3105 
 3106         if (!in6p->in6p_outputopts)
 3107                 return 0;
 3108 
 3109         len = 0;
 3110 #define elen(x) \
 3111     (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
 3112 
 3113         len += elen(in6p->in6p_outputopts->ip6po_hbh);
 3114         if (in6p->in6p_outputopts->ip6po_rthdr)
 3115                 /* dest1 is valid with rthdr only */
 3116                 len += elen(in6p->in6p_outputopts->ip6po_dest1);
 3117         len += elen(in6p->in6p_outputopts->ip6po_rthdr);
 3118         len += elen(in6p->in6p_outputopts->ip6po_dest2);
 3119         return len;
 3120 #undef elen
 3121 }

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