sys/netinet6/ip6_output.c

   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
  63 #include <sys/cdefs.h>
  64 #include "opt_inet.h"
  65 #include "opt_inet6.h"
  66 #include "opt_ipsec.h"
  67 #include "opt_kern_tls.h"
  68 #include "opt_ratelimit.h"
  69 #include "opt_route.h"
  70 #include "opt_rss.h"
  71 #include "opt_sctp.h"
  72
  73 #include <sys/param.h>
  74 #include <sys/kernel.h>
  75 #include <sys/ktls.h>
  76 #include <sys/malloc.h>
  77 #include <sys/mbuf.h>
  78 #include <sys/errno.h>
  79 #include <sys/priv.h>
  80 #include <sys/proc.h>
  81 #include <sys/protosw.h>
  82 #include <sys/socket.h>
  83 #include <sys/socketvar.h>
  84 #include <sys/syslog.h>
  85 #include <sys/ucred.h>
  86
  87 #include <machine/in_cksum.h>
  88
  89 #include <net/if.h>
  90 #include <net/if_var.h>
  91 #include <net/if_private.h>
  92 #include <net/if_vlan_var.h>
  93 #include <net/if_llatbl.h>
  94 #include <net/ethernet.h>
  95 #include <net/netisr.h>
  96 #include <net/route.h>
  97 #include <net/route/nhop.h>
  98 #include <net/pfil.h>
  99 #include <net/rss_config.h>
 100 #include <net/vnet.h>
 101
 102 #include <netinet/in.h>
 103 #include <netinet/in_var.h>
 104 #include <netinet/ip_var.h>
 105 #include <netinet6/in6_fib.h>
 106 #include <netinet6/in6_var.h>
 107 #include <netinet/ip6.h>
 108 #include <netinet/icmp6.h>
 109 #include <netinet6/ip6_var.h>
 110 #include <netinet/in_pcb.h>
 111 #include <netinet/tcp_var.h>
 112 #include <netinet6/nd6.h>
 113 #include <netinet6/in6_rss.h>
 114
 115 #include <netipsec/ipsec_support.h>
 116 #if defined(SCTP) || defined(SCTP_SUPPORT)
 117 #include <netinet/sctp.h>
 118 #include <netinet/sctp_crc32.h>
 119 #endif
 120
 121 #include <netinet6/scope6_var.h>
 122
 123 extern int in6_mcast_loop;
 124
 125 struct ip6_exthdrs {
 126         struct mbuf *ip6e_ip6;
 127         struct mbuf *ip6e_hbh;
 128         struct mbuf *ip6e_dest1;
 129         struct mbuf *ip6e_rthdr;
 130         struct mbuf *ip6e_dest2;
 131 };
 132
 133 static MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
 134
 135 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
 136                            struct ucred *, int);
 137 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
 138         struct socket *, struct sockopt *);
 139 static int ip6_getpcbopt(struct inpcb *, int, struct sockopt *);
 140 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
 141         struct ucred *, int, int, int);
 142
 143 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
 144 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
 145         struct ip6_frag **);
 146 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
 147 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
 148 static int ip6_getpmtu(struct route_in6 *, int,
 149         struct ifnet *, const struct in6_addr *, u_long *, int *, u_int,
 150         u_int);
 151 static int ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long,
 152         u_long *, int *, u_int);
 153 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *);
 154 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
 155
 156 /*
 157  * Make an extension header from option data.  hp is the source,
 158  * mp is the destination, and _ol is the optlen.
 159  */
 160 #define MAKE_EXTHDR(hp, mp, _ol)                                        \
 161     do {                                                                \
 162         struct ip6_ext *eh = (struct ip6_ext *)(hp);            \
 163         error = ip6_copyexthdr((mp), (caddr_t)(hp),             \
 164             ((eh)->ip6e_len + 1) << 3);                         \
 165         if (error)                                              \
 166                 goto freehdrs;                                  \
 167         (_ol) += (*(mp))->m_len;                                \
 168     } while (/*CONSTCOND*/ 0)
 169
 170 /*
 171  * Form a chain of extension headers.
 172  * m is the extension header mbuf
 173  * mp is the previous mbuf in the chain
 174  * p is the next header
 175  * i is the type of option.
 176  */
 177 #define MAKE_CHAIN(m, mp, p, i)\
 178     do {\
 179         if (m) {\
 180                 if (!hdrsplit) \
 181                         panic("%s:%d: assumption failed: "\
 182                             "hdr not split: hdrsplit %d exthdrs %p",\
 183                             __func__, __LINE__, hdrsplit, &exthdrs);\
 184                 *mtod((m), u_char *) = *(p);\
 185                 *(p) = (i);\
 186                 p = mtod((m), u_char *);\
 187                 (m)->m_next = (mp)->m_next;\
 188                 (mp)->m_next = (m);\
 189                 (mp) = (m);\
 190         }\
 191     } while (/*CONSTCOND*/ 0)
 192
 193 void
 194 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
 195 {
 196         u_short csum;
 197
 198         csum = in_cksum_skip(m, offset + plen, offset);
 199         if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
 200                 csum = 0xffff;
 201         offset += m->m_pkthdr.csum_data;        /* checksum offset */
 202
 203         if (offset + sizeof(csum) > m->m_len)
 204                 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
 205         else
 206                 *(u_short *)mtodo(m, offset) = csum;
 207 }
 208
 209 static void
 210 ip6_output_delayed_csum(struct mbuf *m, struct ifnet *ifp, int csum_flags,
 211     int plen, int optlen)
 212 {
 213
 214         KASSERT((plen >= optlen), ("%s:%d: plen %d < optlen %d, m %p, ifp %p "
 215             "csum_flags %#x",
 216             __func__, __LINE__, plen, optlen, m, ifp, csum_flags));
 217
 218         if (csum_flags & CSUM_DELAY_DATA_IPV6) {
 219                 in6_delayed_cksum(m, plen - optlen,
 220                     sizeof(struct ip6_hdr) + optlen);
 221                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
 222         }
 223 #if defined(SCTP) || defined(SCTP_SUPPORT)
 224         if (csum_flags & CSUM_SCTP_IPV6) {
 225                 sctp_delayed_cksum(m, sizeof(struct ip6_hdr) + optlen);
 226                 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
 227         }
 228 #endif
 229 }
 230
 231 int
 232 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto,
 233     int fraglen , uint32_t id)
 234 {
 235         struct mbuf *m, **mnext, *m_frgpart;
 236         struct ip6_hdr *ip6, *mhip6;
 237         struct ip6_frag *ip6f;
 238         int off;
 239         int error;
 240         int tlen = m0->m_pkthdr.len;
 241
 242         KASSERT((fraglen % 8 == 0), ("Fragment length must be a multiple of 8"));
 243
 244         m = m0;
 245         ip6 = mtod(m, struct ip6_hdr *);
 246         mnext = &m->m_nextpkt;
 247
 248         for (off = hlen; off < tlen; off += fraglen) {
 249                 m = m_gethdr(M_NOWAIT, MT_DATA);
 250                 if (!m) {
 251                         IP6STAT_INC(ip6s_odropped);
 252                         return (ENOBUFS);
 253                 }
 254
 255                 /*
 256                  * Make sure the complete packet header gets copied
 257                  * from the originating mbuf to the newly created
 258                  * mbuf. This also ensures that existing firewall
 259                  * classification(s), VLAN tags and so on get copied
 260                  * to the resulting fragmented packet(s):
 261                  */
 262                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
 263                         m_free(m);
 264                         IP6STAT_INC(ip6s_odropped);
 265                         return (ENOBUFS);
 266                 }
 267
 268                 *mnext = m;
 269                 mnext = &m->m_nextpkt;
 270                 m->m_data += max_linkhdr;
 271                 mhip6 = mtod(m, struct ip6_hdr *);
 272                 *mhip6 = *ip6;
 273                 m->m_len = sizeof(*mhip6);
 274                 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
 275                 if (error) {
 276                         IP6STAT_INC(ip6s_odropped);
 277                         return (error);
 278                 }
 279                 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
 280                 if (off + fraglen >= tlen)
 281                         fraglen = tlen - off;
 282                 else
 283                         ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
 284                 mhip6->ip6_plen = htons((u_short)(fraglen + hlen +
 285                     sizeof(*ip6f) - sizeof(struct ip6_hdr)));
 286                 if ((m_frgpart = m_copym(m0, off, fraglen, M_NOWAIT)) == NULL) {
 287                         IP6STAT_INC(ip6s_odropped);
 288                         return (ENOBUFS);
 289                 }
 290                 m_cat(m, m_frgpart);
 291                 m->m_pkthdr.len = fraglen + hlen + sizeof(*ip6f);
 292                 ip6f->ip6f_reserved = 0;
 293                 ip6f->ip6f_ident = id;
 294                 ip6f->ip6f_nxt = nextproto;
 295                 IP6STAT_INC(ip6s_ofragments);
 296                 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
 297         }
 298
 299         return (0);
 300 }
 301
 302 static int
 303 ip6_output_send(struct inpcb *inp, struct ifnet *ifp, struct ifnet *origifp,
 304     struct mbuf *m, struct sockaddr_in6 *dst, struct route_in6 *ro,
 305     bool stamp_tag)
 306 {
 307 #ifdef KERN_TLS
 308         struct ktls_session *tls = NULL;
 309 #endif
 310         struct m_snd_tag *mst;
 311         int error;
 312
 313         MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
 314         mst = NULL;
 315
 316 #ifdef KERN_TLS
 317         /*
 318          * If this is an unencrypted TLS record, save a reference to
 319          * the record.  This local reference is used to call
 320          * ktls_output_eagain after the mbuf has been freed (thus
 321          * dropping the mbuf's reference) in if_output.
 322          */
 323         if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) {
 324                 tls = ktls_hold(m->m_next->m_epg_tls);
 325                 mst = tls->snd_tag;
 326
 327                 /*
 328                  * If a TLS session doesn't have a valid tag, it must
 329                  * have had an earlier ifp mismatch, so drop this
 330                  * packet.
 331                  */
 332                 if (mst == NULL) {
 333                         m_freem(m);
 334                         error = EAGAIN;
 335                         goto done;
 336                 }
 337                 /*
 338                  * Always stamp tags that include NIC ktls.
 339                  */
 340                 stamp_tag = true;
 341         }
 342 #endif
 343 #ifdef RATELIMIT
 344         if (inp != NULL && mst == NULL) {
 345                 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 ||
 346                     (inp->inp_snd_tag != NULL &&
 347                     inp->inp_snd_tag->ifp != ifp))
 348                         in_pcboutput_txrtlmt(inp, ifp, m);
 349
 350                 if (inp->inp_snd_tag != NULL)
 351                         mst = inp->inp_snd_tag;
 352         }
 353 #endif
 354         if (stamp_tag && mst != NULL) {
 355                 KASSERT(m->m_pkthdr.rcvif == NULL,
 356                     ("trying to add a send tag to a forwarded packet"));
 357                 if (mst->ifp != ifp) {
 358                         m_freem(m);
 359                         error = EAGAIN;
 360                         goto done;
 361                 }
 362
 363                 /* stamp send tag on mbuf */
 364                 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst);
 365                 m->m_pkthdr.csum_flags |= CSUM_SND_TAG;
 366         }
 367
 368         error = nd6_output_ifp(ifp, origifp, m, dst, (struct route *)ro);
 369
 370 done:
 371         /* Check for route change invalidating send tags. */
 372 #ifdef KERN_TLS
 373         if (tls != NULL) {
 374                 if (error == EAGAIN)
 375                         error = ktls_output_eagain(inp, tls);
 376                 ktls_free(tls);
 377         }
 378 #endif
 379 #ifdef RATELIMIT
 380         if (error == EAGAIN)
 381                 in_pcboutput_eagain(inp);
 382 #endif
 383         return (error);
 384 }
 385
 386 /*
 387  * IP6 output.
 388  * The packet in mbuf chain m contains a skeletal IP6 header (with pri, len,
 389  * nxt, hlim, src, dst).
 390  * This function may modify ver and hlim only.
 391  * The mbuf chain containing the packet will be freed.
 392  * The mbuf opt, if present, will not be freed.
 393  * If route_in6 ro is present and has ro_nh initialized, route lookup would be
 394  * skipped and ro->ro_nh would be used. If ro is present but ro->ro_nh is NULL,
 395  * then result of route lookup is stored in ro->ro_nh.
 396  *
 397  * Type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and nd_ifinfo.linkmtu
 398  * is uint32_t.  So we use u_long to hold largest one, which is rt_mtu.
 399  *
 400  * ifpp - XXX: just for statistics
 401  */
 402 int
 403 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
 404     struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
 405     struct ifnet **ifpp, struct inpcb *inp)
 406 {
 407         struct ip6_hdr *ip6;
 408         struct ifnet *ifp, *origifp;
 409         struct mbuf *m = m0;
 410         struct mbuf *mprev;
 411         struct route_in6 *ro_pmtu;
 412         struct nhop_object *nh;
 413         struct sockaddr_in6 *dst, sin6, src_sa, dst_sa;
 414         struct in6_addr odst;
 415         u_char *nexthdrp;
 416         int tlen, len;
 417         int error = 0;
 418         int vlan_pcp = -1;
 419         struct in6_ifaddr *ia = NULL;
 420         u_long mtu;
 421         int alwaysfrag, dontfrag;
 422         u_int32_t optlen, plen = 0, unfragpartlen;
 423         struct ip6_exthdrs exthdrs;
 424         struct in6_addr src0, dst0;
 425         u_int32_t zone;
 426         bool hdrsplit;
 427         int sw_csum, tso;
 428         int needfiblookup;
 429         uint32_t fibnum;
 430         struct m_tag *fwd_tag = NULL;
 431         uint32_t id;
 432         uint32_t optvalid;
 433
 434         NET_EPOCH_ASSERT();
 435
 436         if (inp != NULL) {
 437                 INP_LOCK_ASSERT(inp);
 438                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 439                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 440                         /* Unconditionally set flowid. */
 441                         m->m_pkthdr.flowid = inp->inp_flowid;
 442                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 443                 }
 444                 if ((inp->inp_flags2 & INP_2PCP_SET) != 0)
 445                         vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >>
 446                             INP_2PCP_SHIFT;
 447 #ifdef NUMA
 448                 m->m_pkthdr.numa_domain = inp->inp_numa_domain;
 449 #endif
 450         }
 451
 452 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 453         /*
 454          * IPSec checking which handles several cases.
 455          * FAST IPSEC: We re-injected the packet.
 456          * XXX: need scope argument.
 457          */
 458         if (IPSEC_ENABLED(ipv6)) {
 459                 m = mb_unmapped_to_ext(m);
 460                 if (m == NULL) {
 461                         IP6STAT_INC(ip6s_odropped);
 462                         error = ENOBUFS;
 463                         goto bad;
 464                 }
 465                 if ((error = IPSEC_OUTPUT(ipv6, m, inp)) != 0) {
 466                         if (error == EINPROGRESS)
 467                                 error = 0;
 468                         goto done;
 469                 }
 470         }
 471 #endif /* IPSEC */
 472
 473         /* Source address validation. */
 474         ip6 = mtod(m, struct ip6_hdr *);
 475         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
 476             (flags & IPV6_UNSPECSRC) == 0) {
 477                 error = EOPNOTSUPP;
 478                 IP6STAT_INC(ip6s_badscope);
 479                 goto bad;
 480         }
 481         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
 482                 error = EOPNOTSUPP;
 483                 IP6STAT_INC(ip6s_badscope);
 484                 goto bad;
 485         }
 486
 487         /*
 488          * If we are given packet options to add extension headers prepare them.
 489          * Calculate the total length of the extension header chain.
 490          * Keep the length of the unfragmentable part for fragmentation.
 491          */
 492         bzero(&exthdrs, sizeof(exthdrs));
 493         optlen = optvalid = 0;
 494         unfragpartlen = sizeof(struct ip6_hdr);
 495         if (opt) {
 496                 optvalid = opt->ip6po_valid;
 497
 498                 /* Hop-by-Hop options header. */
 499                 if ((optvalid & IP6PO_VALID_HBH) != 0)
 500                         MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh, optlen);
 501
 502                 /* Destination options header (1st part). */
 503                 if ((optvalid & IP6PO_VALID_RHINFO) != 0) {
 504 #ifndef RTHDR_SUPPORT_IMPLEMENTED
 505                         /*
 506                          * If there is a routing header, discard the packet
 507                          * right away here. RH0/1 are obsolete and we do not
 508                          * currently support RH2/3/4.
 509                          * People trying to use RH253/254 may want to disable
 510                          * this check.
 511                          * The moment we do support any routing header (again)
 512                          * this block should check the routing type more
 513                          * selectively.
 514                          */
 515                         error = EINVAL;
 516                         goto bad;
 517 #endif
 518
 519                         /*
 520                          * Destination options header (1st part).
 521                          * This only makes sense with a routing header.
 522                          * See Section 9.2 of RFC 3542.
 523                          * Disabling this part just for MIP6 convenience is
 524                          * a bad idea.  We need to think carefully about a
 525                          * way to make the advanced API coexist with MIP6
 526                          * options, which might automatically be inserted in
 527                          * the kernel.
 528                          */
 529                         if ((optvalid & IP6PO_VALID_DEST1) != 0)
 530                                 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1,
 531                                     optlen);
 532                 }
 533                 /* Routing header. */
 534                 if ((optvalid & IP6PO_VALID_RHINFO) != 0)
 535                         MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr, optlen);
 536
 537                 unfragpartlen += optlen;
 538
 539                 /*
 540                  * NOTE: we don't add AH/ESP length here (done in
 541                  * ip6_ipsec_output()).
 542                  */
 543
 544                 /* Destination options header (2nd part). */
 545                 if ((optvalid & IP6PO_VALID_DEST2) != 0)
 546                         MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2, optlen);
 547         }
 548
 549         /*
 550          * If there is at least one extension header,
 551          * separate IP6 header from the payload.
 552          */
 553         hdrsplit = false;
 554         if (optlen) {
 555                 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
 556                         m = NULL;
 557                         goto freehdrs;
 558                 }
 559                 m = exthdrs.ip6e_ip6;
 560                 ip6 = mtod(m, struct ip6_hdr *);
 561                 hdrsplit = true;
 562         }
 563
 564         /* Adjust mbuf packet header length. */
 565         m->m_pkthdr.len += optlen;
 566         plen = m->m_pkthdr.len - sizeof(*ip6);
 567
 568         /* If this is a jumbo payload, insert a jumbo payload option. */
 569         if (plen > IPV6_MAXPACKET) {
 570                 if (!hdrsplit) {
 571                         if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
 572                                 m = NULL;
 573                                 goto freehdrs;
 574                         }
 575                         m = exthdrs.ip6e_ip6;
 576                         ip6 = mtod(m, struct ip6_hdr *);
 577                         hdrsplit = true;
 578                 }
 579                 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
 580                         goto freehdrs;
 581                 ip6->ip6_plen = 0;
 582         } else
 583                 ip6->ip6_plen = htons(plen);
 584         nexthdrp = &ip6->ip6_nxt;
 585
 586         if (optlen) {
 587                 /*
 588                  * Concatenate headers and fill in next header fields.
 589                  * Here we have, on "m"
 590                  *      IPv6 payload
 591                  * and we insert headers accordingly.
 592                  * Finally, we should be getting:
 593                  *      IPv6 hbh dest1 rthdr ah* [esp* dest2 payload].
 594                  *
 595                  * During the header composing process "m" points to IPv6
 596                  * header.  "mprev" points to an extension header prior to esp.
 597                  */
 598                 mprev = m;
 599
 600                 /*
 601                  * We treat dest2 specially.  This makes IPsec processing
 602                  * much easier.  The goal here is to make mprev point the
 603                  * mbuf prior to dest2.
 604                  *
 605                  * Result: IPv6 dest2 payload.
 606                  * m and mprev will point to IPv6 header.
 607                  */
 608                 if (exthdrs.ip6e_dest2) {
 609                         if (!hdrsplit)
 610                                 panic("%s:%d: assumption failed: "
 611                                     "hdr not split: hdrsplit %d exthdrs %p",
 612                                     __func__, __LINE__, hdrsplit, &exthdrs);
 613                         exthdrs.ip6e_dest2->m_next = m->m_next;
 614                         m->m_next = exthdrs.ip6e_dest2;
 615                         *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
 616                         ip6->ip6_nxt = IPPROTO_DSTOPTS;
 617                 }
 618
 619                 /*
 620                  * Result: IPv6 hbh dest1 rthdr dest2 payload.
 621                  * m will point to IPv6 header.  mprev will point to the
 622                  * extension header prior to dest2 (rthdr in the above case).
 623                  */
 624                 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
 625                 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
 626                            IPPROTO_DSTOPTS);
 627                 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
 628                            IPPROTO_ROUTING);
 629         }
 630
 631         IP6STAT_INC(ip6s_localout);
 632
 633         /* Route packet. */
 634         ro_pmtu = ro;
 635         if ((optvalid & IP6PO_VALID_RHINFO) != 0)
 636                 ro = &opt->ip6po_route;
 637         if (ro != NULL)
 638                 dst = (struct sockaddr_in6 *)&ro->ro_dst;
 639         else
 640                 dst = &sin6;
 641         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 642
 643 again:
 644         /*
 645          * If specified, try to fill in the traffic class field.
 646          * Do not override if a non-zero value is already set.
 647          * We check the diffserv field and the ECN field separately.
 648          */
 649         if ((optvalid & IP6PO_VALID_TC) != 0){
 650                 int mask = 0;
 651
 652                 if (IPV6_DSCP(ip6) == 0)
 653                         mask |= 0xfc;
 654                 if (IPV6_ECN(ip6) == 0)
 655                         mask |= 0x03;
 656                 if (mask != 0)
 657                         ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
 658         }
 659
 660         /* Fill in or override the hop limit field, if necessary. */
 661         if ((optvalid & IP6PO_VALID_HLIM) != 0)
 662                 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
 663         else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 664                 if (im6o != NULL)
 665                         ip6->ip6_hlim = im6o->im6o_multicast_hlim;
 666                 else
 667                         ip6->ip6_hlim = V_ip6_defmcasthlim;
 668         }
 669
 670         if (ro == NULL || ro->ro_nh == NULL) {
 671                 bzero(dst, sizeof(*dst));
 672                 dst->sin6_family = AF_INET6;
 673                 dst->sin6_len = sizeof(*dst);
 674                 dst->sin6_addr = ip6->ip6_dst;
 675         }
 676         /*
 677          * Validate route against routing table changes.
 678          * Make sure that the address family is set in route.
 679          */
 680         nh = NULL;
 681         ifp = NULL;
 682         mtu = 0;
 683         if (ro != NULL) {
 684                 if (ro->ro_nh != NULL && inp != NULL) {
 685                         ro->ro_dst.sin6_family = AF_INET6; /* XXX KASSERT? */
 686                         NH_VALIDATE((struct route *)ro, &inp->inp_rt_cookie,
 687                             fibnum);
 688                 }
 689                 if (ro->ro_nh != NULL && fwd_tag == NULL &&
 690                     (!NH_IS_VALID(ro->ro_nh) ||
 691                     ro->ro_dst.sin6_family != AF_INET6 ||
 692                     !IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)))
 693                         RO_INVALIDATE_CACHE(ro);
 694
 695                 if (ro->ro_nh != NULL && fwd_tag == NULL &&
 696                     ro->ro_dst.sin6_family == AF_INET6 &&
 697                     IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) {
 698                         /* Nexthop is valid and contains valid ifp */
 699                         nh = ro->ro_nh;
 700                 } else {
 701                         if (ro->ro_lle)
 702                                 LLE_FREE(ro->ro_lle);   /* zeros ro_lle */
 703                         ro->ro_lle = NULL;
 704                         if (fwd_tag == NULL) {
 705                                 bzero(&dst_sa, sizeof(dst_sa));
 706                                 dst_sa.sin6_family = AF_INET6;
 707                                 dst_sa.sin6_len = sizeof(dst_sa);
 708                                 dst_sa.sin6_addr = ip6->ip6_dst;
 709                         }
 710                         error = in6_selectroute(&dst_sa, opt, im6o, ro, &ifp,
 711                             &nh, fibnum, m->m_pkthdr.flowid);
 712                         if (error != 0) {
 713                                 IP6STAT_INC(ip6s_noroute);
 714                                 if (ifp != NULL)
 715                                         in6_ifstat_inc(ifp, ifs6_out_discard);
 716                                 goto bad;
 717                         }
 718                         /*
 719                          * At this point at least @ifp is not NULL
 720                          * Can be the case when dst is multicast, link-local or
 721                          * interface is explicitly specificed by the caller.
 722                          */
 723                 }
 724                 if (nh == NULL) {
 725                         /*
 726                          * If in6_selectroute() does not return a nexthop
 727                          * dst may not have been updated.
 728                          */
 729                         *dst = dst_sa;  /* XXX */
 730                         origifp = ifp;
 731                         mtu = ifp->if_mtu;
 732                 } else {
 733                         ifp = nh->nh_ifp;
 734                         origifp = nh->nh_aifp;
 735                         ia = (struct in6_ifaddr *)(nh->nh_ifa);
 736                         counter_u64_add(nh->nh_pksent, 1);
 737                 }
 738         } else {
 739                 struct nhop_object *nh;
 740                 struct in6_addr kdst;
 741                 uint32_t scopeid;
 742
 743                 if (fwd_tag == NULL) {
 744                         bzero(&dst_sa, sizeof(dst_sa));
 745                         dst_sa.sin6_family = AF_INET6;
 746                         dst_sa.sin6_len = sizeof(dst_sa);
 747                         dst_sa.sin6_addr = ip6->ip6_dst;
 748                 }
 749
 750                 if (IN6_IS_ADDR_MULTICAST(&dst_sa.sin6_addr) &&
 751                     im6o != NULL &&
 752                     (ifp = im6o->im6o_multicast_ifp) != NULL) {
 753                         /* We do not need a route lookup. */
 754                         *dst = dst_sa;  /* XXX */
 755                         origifp = ifp;
 756                         goto nonh6lookup;
 757                 }
 758
 759                 in6_splitscope(&dst_sa.sin6_addr, &kdst, &scopeid);
 760
 761                 if (IN6_IS_ADDR_MC_LINKLOCAL(&dst_sa.sin6_addr) ||
 762                     IN6_IS_ADDR_MC_NODELOCAL(&dst_sa.sin6_addr)) {
 763                         if (scopeid > 0) {
 764                                 ifp = in6_getlinkifnet(scopeid);
 765                                 if (ifp == NULL) {
 766                                         error = EHOSTUNREACH;
 767                                         goto bad;
 768                                 }
 769                                 *dst = dst_sa;  /* XXX */
 770                                 origifp = ifp;
 771                                 goto nonh6lookup;
 772                         }
 773                 }
 774
 775                 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE,
 776                     m->m_pkthdr.flowid);
 777                 if (nh == NULL) {
 778                         IP6STAT_INC(ip6s_noroute);
 779                         /* No ifp in6_ifstat_inc(ifp, ifs6_out_discard); */
 780                         error = EHOSTUNREACH;
 781                         goto bad;
 782                 }
 783
 784                 ifp = nh->nh_ifp;
 785                 origifp = nh->nh_aifp;
 786                 ia = ifatoia6(nh->nh_ifa);
 787                 if (nh->nh_flags & NHF_GATEWAY)
 788                         dst->sin6_addr = nh->gw6_sa.sin6_addr;
 789                 else if (fwd_tag != NULL)
 790                         dst->sin6_addr = dst_sa.sin6_addr;
 791 nonh6lookup:
 792                 ;
 793         }
 794         /*
 795          * At this point ifp MUST be pointing to the valid transmit ifp.
 796          * origifp MUST be valid and pointing to either the same ifp or,
 797          * in case of loopback output, to the interface which ip6_src
 798          * belongs to.
 799          * Examples:
 800          *  fe80::1%em0 -> fe80::2%em0 -> ifp=em0, origifp=em0
 801          *  fe80::1%em0 -> fe80::1%em0 -> ifp=lo0, origifp=em0
 802          *  ::1 -> ::1 -> ifp=lo0, origifp=lo0
 803          *
 804          * mtu can be 0 and will be refined later.
 805          */
 806         KASSERT((ifp != NULL), ("output interface must not be NULL"));
 807         KASSERT((origifp != NULL), ("output address interface must not be NULL"));
 808
 809         if ((flags & IPV6_FORWARDING) == 0) {
 810                 /* XXX: the FORWARDING flag can be set for mrouting. */
 811                 in6_ifstat_inc(ifp, ifs6_out_request);
 812         }
 813
 814         /* Setup data structures for scope ID checks. */
 815         src0 = ip6->ip6_src;
 816         bzero(&src_sa, sizeof(src_sa));
 817         src_sa.sin6_family = AF_INET6;
 818         src_sa.sin6_len = sizeof(src_sa);
 819         src_sa.sin6_addr = ip6->ip6_src;
 820
 821         dst0 = ip6->ip6_dst;
 822         /* Re-initialize to be sure. */
 823         bzero(&dst_sa, sizeof(dst_sa));
 824         dst_sa.sin6_family = AF_INET6;
 825         dst_sa.sin6_len = sizeof(dst_sa);
 826         dst_sa.sin6_addr = ip6->ip6_dst;
 827
 828         /* Check for valid scope ID. */
 829         if (in6_setscope(&src0, origifp, &zone) == 0 &&
 830             sa6_recoverscope(&src_sa) == 0 && zone == src_sa.sin6_scope_id &&
 831             in6_setscope(&dst0, origifp, &zone) == 0 &&
 832             sa6_recoverscope(&dst_sa) == 0 && zone == dst_sa.sin6_scope_id) {
 833                 /*
 834                  * The outgoing interface is in the zone of the source
 835                  * and destination addresses.
 836                  *
 837                  */
 838         } else if ((origifp->if_flags & IFF_LOOPBACK) == 0 ||
 839             sa6_recoverscope(&src_sa) != 0 ||
 840             sa6_recoverscope(&dst_sa) != 0 ||
 841             dst_sa.sin6_scope_id == 0 ||
 842             (src_sa.sin6_scope_id != 0 &&
 843             src_sa.sin6_scope_id != dst_sa.sin6_scope_id) ||
 844             ifnet_byindex(dst_sa.sin6_scope_id) == NULL) {
 845                 /*
 846                  * If the destination network interface is not a
 847                  * loopback interface, or the destination network
 848                  * address has no scope ID, or the source address has
 849                  * a scope ID set which is different from the
 850                  * destination address one, or there is no network
 851                  * interface representing this scope ID, the address
 852                  * pair is considered invalid.
 853                  */
 854                 IP6STAT_INC(ip6s_badscope);
 855                 in6_ifstat_inc(origifp, ifs6_out_discard);
 856                 if (error == 0)
 857                         error = EHOSTUNREACH; /* XXX */
 858                 goto bad;
 859         }
 860         /* All scope ID checks are successful. */
 861
 862         if (nh && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 863                 if ((optvalid & IP6PO_VALID_NHINFO) != 0) {
 864                         /*
 865                          * The nexthop is explicitly specified by the
 866                          * application.  We assume the next hop is an IPv6
 867                          * address.
 868                          */
 869                         dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
 870                 }
 871                 else if ((nh->nh_flags & NHF_GATEWAY))
 872                         dst = &nh->gw6_sa;
 873         }
 874
 875         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 876                 m->m_flags &= ~(M_BCAST | M_MCAST); /* Just in case. */
 877         } else {
 878                 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
 879                 in6_ifstat_inc(ifp, ifs6_out_mcast);
 880
 881                 /* Confirm that the outgoing interface supports multicast. */
 882                 if (!(ifp->if_flags & IFF_MULTICAST)) {
 883                         IP6STAT_INC(ip6s_noroute);
 884                         in6_ifstat_inc(ifp, ifs6_out_discard);
 885                         error = ENETUNREACH;
 886                         goto bad;
 887                 }
 888                 if ((im6o == NULL && in6_mcast_loop) ||
 889                     (im6o && im6o->im6o_multicast_loop)) {
 890                         /*
 891                          * Loop back multicast datagram if not expressly
 892                          * forbidden to do so, even if we have not joined
 893                          * the address; protocols will filter it later,
 894                          * thus deferring a hash lookup and lock acquisition
 895                          * at the expense of an m_copym().
 896                          */
 897                         ip6_mloopback(ifp, m);
 898                 } else {
 899                         /*
 900                          * If we are acting as a multicast router, perform
 901                          * multicast forwarding as if the packet had just
 902                          * arrived on the interface to which we are about
 903                          * to send.  The multicast forwarding function
 904                          * recursively calls this function, using the
 905                          * IPV6_FORWARDING flag to prevent infinite recursion.
 906                          *
 907                          * Multicasts that are looped back by ip6_mloopback(),
 908                          * above, will be forwarded by the ip6_input() routine,
 909                          * if necessary.
 910                          */
 911                         if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
 912                                 /*
 913                                  * XXX: ip6_mforward expects that rcvif is NULL
 914                                  * when it is called from the originating path.
 915                                  * However, it may not always be the case.
 916                                  */
 917                                 m->m_pkthdr.rcvif = NULL;
 918                                 if (ip6_mforward(ip6, ifp, m) != 0) {
 919                                         m_freem(m);
 920                                         goto done;
 921                                 }
 922                         }
 923                 }
 924                 /*
 925                  * Multicasts with a hoplimit of zero may be looped back,
 926                  * above, but must not be transmitted on a network.
 927                  * Also, multicasts addressed to the loopback interface
 928                  * are not sent -- the above call to ip6_mloopback() will
 929                  * loop back a copy if this host actually belongs to the
 930                  * destination group on the loopback interface.
 931                  */
 932                 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
 933                     IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
 934                         m_freem(m);
 935                         goto done;
 936                 }
 937         }
 938
 939         /*
 940          * Fill the outgoing inteface to tell the upper layer
 941          * to increment per-interface statistics.
 942          */
 943         if (ifpp)
 944                 *ifpp = ifp;
 945
 946         /* Determine path MTU. */
 947         if ((error = ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst,
 948                     &mtu, &alwaysfrag, fibnum, *nexthdrp)) != 0)
 949                 goto bad;
 950         KASSERT(mtu > 0, ("%s:%d: mtu %ld, ro_pmtu %p ro %p ifp %p "
 951             "alwaysfrag %d fibnum %u\n", __func__, __LINE__, mtu, ro_pmtu, ro,
 952             ifp, alwaysfrag, fibnum));
 953
 954         /*
 955          * The caller of this function may specify to use the minimum MTU
 956          * in some cases.
 957          * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
 958          * setting.  The logic is a bit complicated; by default, unicast
 959          * packets will follow path MTU while multicast packets will be sent at
 960          * the minimum MTU.  If IP6PO_MINMTU_ALL is specified, all packets
 961          * including unicast ones will be sent at the minimum MTU.  Multicast
 962          * packets will always be sent at the minimum MTU unless
 963          * IP6PO_MINMTU_DISABLE is explicitly specified.
 964          * See RFC 3542 for more details.
 965          */
 966         if (mtu > IPV6_MMTU) {
 967                 if ((flags & IPV6_MINMTU))
 968                         mtu = IPV6_MMTU;
 969                 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
 970                         mtu = IPV6_MMTU;
 971                 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
 972                          (opt == NULL ||
 973                           opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
 974                         mtu = IPV6_MMTU;
 975                 }
 976         }
 977
 978         /*
 979          * Clear embedded scope identifiers if necessary.
 980          * in6_clearscope() will touch the addresses only when necessary.
 981          */
 982         in6_clearscope(&ip6->ip6_src);
 983         in6_clearscope(&ip6->ip6_dst);
 984
 985         /*
 986          * If the outgoing packet contains a hop-by-hop options header,
 987          * it must be examined and processed even by the source node.
 988          * (RFC 2460, section 4.)
 989          */
 990         if (exthdrs.ip6e_hbh) {
 991                 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
 992                 u_int32_t dummy; /* XXX unused */
 993                 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
 994
 995 #ifdef DIAGNOSTIC
 996                 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
 997                         panic("ip6e_hbh is not contiguous");
 998 #endif
 999                 /*
1000                  *  XXX: if we have to send an ICMPv6 error to the sender,
1001                  *       we need the M_LOOP flag since icmp6_error() expects
1002                  *       the IPv6 and the hop-by-hop options header are
1003                  *       contiguous unless the flag is set.
1004                  */
1005                 m->m_flags |= M_LOOP;
1006                 m->m_pkthdr.rcvif = ifp;
1007                 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
1008                     ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
1009                     &dummy, &plen) < 0) {
1010                         /* m was already freed at this point. */
1011                         error = EINVAL;/* better error? */
1012                         goto done;
1013                 }
1014                 m->m_flags &= ~M_LOOP; /* XXX */
1015                 m->m_pkthdr.rcvif = NULL;
1016         }
1017
1018         /* Jump over all PFIL processing if hooks are not active. */
1019         if (!PFIL_HOOKED_OUT(V_inet6_pfil_head))
1020                 goto passout;
1021
1022         odst = ip6->ip6_dst;
1023         /* Run through list of hooks for output packets. */
1024         switch (pfil_mbuf_out(V_inet6_pfil_head, &m, ifp, inp)) {
1025         case PFIL_PASS:
1026                 ip6 = mtod(m, struct ip6_hdr *);
1027                 break;
1028         case PFIL_DROPPED:
1029                 error = EACCES;
1030                 /* FALLTHROUGH */
1031         case PFIL_CONSUMED:
1032                 goto done;
1033         }
1034
1035         needfiblookup = 0;
1036         /* See if destination IP address was changed by packet filter. */
1037         if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
1038                 m->m_flags |= M_SKIP_FIREWALL;
1039                 /* If destination is now ourself drop to ip6_input(). */
1040                 if (in6_localip(&ip6->ip6_dst)) {
1041                         m->m_flags |= M_FASTFWD_OURS;
1042                         if (m->m_pkthdr.rcvif == NULL)
1043                                 m->m_pkthdr.rcvif = V_loif;
1044                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1045                                 m->m_pkthdr.csum_flags |=
1046                                     CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
1047                                 m->m_pkthdr.csum_data = 0xffff;
1048                         }
1049 #if defined(SCTP) || defined(SCTP_SUPPORT)
1050                         if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
1051                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
1052 #endif
1053                         error = netisr_queue(NETISR_IPV6, m);
1054                         goto done;
1055                 } else {
1056                         if (ro != NULL)
1057                                 RO_INVALIDATE_CACHE(ro);
1058                         needfiblookup = 1; /* Redo the routing table lookup. */
1059                 }
1060         }
1061         /* See if fib was changed by packet filter. */
1062         if (fibnum != M_GETFIB(m)) {
1063                 m->m_flags |= M_SKIP_FIREWALL;
1064                 fibnum = M_GETFIB(m);
1065                 if (ro != NULL)
1066                         RO_INVALIDATE_CACHE(ro);
1067                 needfiblookup = 1;
1068         }
1069         if (needfiblookup)
1070                 goto again;
1071
1072         /* See if local, if yes, send it to netisr. */
1073         if (m->m_flags & M_FASTFWD_OURS) {
1074                 if (m->m_pkthdr.rcvif == NULL)
1075                         m->m_pkthdr.rcvif = V_loif;
1076                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1077                         m->m_pkthdr.csum_flags |=
1078                             CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
1079                         m->m_pkthdr.csum_data = 0xffff;
1080                 }
1081 #if defined(SCTP) || defined(SCTP_SUPPORT)
1082                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
1083                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
1084 #endif
1085                 error = netisr_queue(NETISR_IPV6, m);
1086                 goto done;
1087         }
1088         /* Or forward to some other address? */
1089         if ((m->m_flags & M_IP6_NEXTHOP) &&
1090             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
1091                 if (ro != NULL)
1092                         dst = (struct sockaddr_in6 *)&ro->ro_dst;
1093                 else
1094                         dst = &sin6;
1095                 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
1096                 m->m_flags |= M_SKIP_FIREWALL;
1097                 m->m_flags &= ~M_IP6_NEXTHOP;
1098                 m_tag_delete(m, fwd_tag);
1099                 goto again;
1100         }
1101
1102 passout:
1103         if (vlan_pcp > -1)
1104                 EVL_APPLY_PRI(m, vlan_pcp);
1105
1106         /* Ensure the packet data is mapped if the interface requires it. */
1107         if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) {
1108                 m = mb_unmapped_to_ext(m);
1109                 if (m == NULL) {
1110                         IP6STAT_INC(ip6s_odropped);
1111                         return (ENOBUFS);
1112                 }
1113         }
1114
1115         /*
1116          * Send the packet to the outgoing interface.
1117          * If necessary, do IPv6 fragmentation before sending.
1118          *
1119          * The logic here is rather complex:
1120          * 1: normal case (dontfrag == 0, alwaysfrag == 0)
1121          * 1-a: send as is if tlen <= path mtu
1122          * 1-b: fragment if tlen > path mtu
1123          *
1124          * 2: if user asks us not to fragment (dontfrag == 1)
1125          * 2-a: send as is if tlen <= interface mtu
1126          * 2-b: error if tlen > interface mtu
1127          *
1128          * 3: if we always need to attach fragment header (alwaysfrag == 1)
1129          *      always fragment
1130          *
1131          * 4: if dontfrag == 1 && alwaysfrag == 1
1132          *      error, as we cannot handle this conflicting request.
1133          */
1134         sw_csum = m->m_pkthdr.csum_flags;
1135         if (!hdrsplit) {
1136                 tso = ((sw_csum & ifp->if_hwassist &
1137                     (CSUM_TSO | CSUM_INNER_TSO)) != 0) ? 1 : 0;
1138                 sw_csum &= ~ifp->if_hwassist;
1139         } else
1140                 tso = 0;
1141         /*
1142          * If we added extension headers, we will not do TSO and calculate the
1143          * checksums ourselves for now.
1144          * XXX-BZ  Need a framework to know when the NIC can handle it, even
1145          * with ext. hdrs.
1146          */
1147         ip6_output_delayed_csum(m, ifp, sw_csum, plen, optlen);
1148         /* XXX-BZ m->m_pkthdr.csum_flags &= ~ifp->if_hwassist; */
1149         tlen = m->m_pkthdr.len;
1150
1151         if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
1152                 dontfrag = 1;
1153         else
1154                 dontfrag = 0;
1155         if (dontfrag && alwaysfrag) {   /* Case 4. */
1156                 /* Conflicting request - can't transmit. */
1157                 error = EMSGSIZE;
1158                 goto bad;
1159         }
1160         if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) {      /* Case 2-b. */
1161                 /*
1162                  * Even if the DONTFRAG option is specified, we cannot send the
1163                  * packet when the data length is larger than the MTU of the
1164                  * outgoing interface.
1165                  * Notify the error by sending IPV6_PATHMTU ancillary data if
1166                  * application wanted to know the MTU value. Also return an
1167                  * error code (this is not described in the API spec).
1168                  */
1169                 if (inp != NULL)
1170                         ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu);
1171                 error = EMSGSIZE;
1172                 goto bad;
1173         }
1174
1175         /* Transmit packet without fragmentation. */
1176         if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* Cases 1-a and 2-a. */
1177                 struct in6_ifaddr *ia6;
1178
1179                 ip6 = mtod(m, struct ip6_hdr *);
1180                 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
1181                 if (ia6) {
1182                         /* Record statistics for this interface address. */
1183                         counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
1184                         counter_u64_add(ia6->ia_ifa.ifa_obytes,
1185                             m->m_pkthdr.len);
1186                 }
1187                 error = ip6_output_send(inp, ifp, origifp, m, dst, ro,
1188                     (flags & IP_NO_SND_TAG_RL) ? false : true);
1189                 goto done;
1190         }
1191
1192         /* Try to fragment the packet.  Cases 1-b and 3. */
1193         if (mtu < IPV6_MMTU) {
1194                 /* Path MTU cannot be less than IPV6_MMTU. */
1195                 error = EMSGSIZE;
1196                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1197                 goto bad;
1198         } else if (ip6->ip6_plen == 0) {
1199                 /* Jumbo payload cannot be fragmented. */
1200                 error = EMSGSIZE;
1201                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1202                 goto bad;
1203         } else {
1204                 u_char nextproto;
1205
1206                 /*
1207                  * Too large for the destination or interface;
1208                  * fragment if possible.
1209                  * Must be able to put at least 8 bytes per fragment.
1210                  */
1211                 if (mtu > IPV6_MAXPACKET)
1212                         mtu = IPV6_MAXPACKET;
1213
1214                 len = (mtu - unfragpartlen - sizeof(struct ip6_frag)) & ~7;
1215                 if (len < 8) {
1216                         error = EMSGSIZE;
1217                         in6_ifstat_inc(ifp, ifs6_out_fragfail);
1218                         goto bad;
1219                 }
1220
1221                 /*
1222                  * If the interface will not calculate checksums on
1223                  * fragmented packets, then do it here.
1224                  * XXX-BZ handle the hw offloading case.  Need flags.
1225                  */
1226                 ip6_output_delayed_csum(m, ifp, m->m_pkthdr.csum_flags, plen,
1227                     optlen);
1228
1229                 /*
1230                  * Change the next header field of the last header in the
1231                  * unfragmentable part.
1232                  */
1233                 if (exthdrs.ip6e_rthdr) {
1234                         nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
1235                         *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
1236                 } else if (exthdrs.ip6e_dest1) {
1237                         nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
1238                         *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
1239                 } else if (exthdrs.ip6e_hbh) {
1240                         nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
1241                         *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
1242                 } else {
1243                         ip6 = mtod(m, struct ip6_hdr *);
1244                         nextproto = ip6->ip6_nxt;
1245                         ip6->ip6_nxt = IPPROTO_FRAGMENT;
1246                 }
1247
1248                 /*
1249                  * Loop through length of segment after first fragment,
1250                  * make new header and copy data of each part and link onto
1251                  * chain.
1252                  */
1253                 m0 = m;
1254                 id = htonl(ip6_randomid());
1255                 error = ip6_fragment(ifp, m, unfragpartlen, nextproto,len, id);
1256                 if (error != 0)
1257                         goto sendorfree;
1258
1259                 in6_ifstat_inc(ifp, ifs6_out_fragok);
1260         }
1261
1262         /* Remove leading garbage. */
1263 sendorfree:
1264         m = m0->m_nextpkt;
1265         m0->m_nextpkt = 0;
1266         m_freem(m0);
1267         for (; m; m = m0) {
1268                 m0 = m->m_nextpkt;
1269                 m->m_nextpkt = 0;
1270                 if (error == 0) {
1271                         /* Record statistics for this interface address. */
1272                         if (ia) {
1273                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1274                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
1275                                     m->m_pkthdr.len);
1276                         }
1277                         if (vlan_pcp > -1)
1278                                 EVL_APPLY_PRI(m, vlan_pcp);
1279                         error = ip6_output_send(inp, ifp, origifp, m, dst, ro,
1280                             true);
1281                 } else
1282                         m_freem(m);
1283         }
1284
1285         if (error == 0)
1286                 IP6STAT_INC(ip6s_fragmented);
1287
1288 done:
1289         return (error);
1290
1291 freehdrs:
1292         m_freem(exthdrs.ip6e_hbh);      /* m_freem() checks if mbuf is NULL. */
1293         m_freem(exthdrs.ip6e_dest1);
1294         m_freem(exthdrs.ip6e_rthdr);
1295         m_freem(exthdrs.ip6e_dest2);
1296         /* FALLTHROUGH */
1297 bad:
1298         if (m)
1299                 m_freem(m);
1300         goto done;
1301 }
1302
1303 static int
1304 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1305 {
1306         struct mbuf *m;
1307
1308         if (hlen > MCLBYTES)
1309                 return (ENOBUFS); /* XXX */
1310
1311         if (hlen > MLEN)
1312                 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1313         else
1314                 m = m_get(M_NOWAIT, MT_DATA);
1315         if (m == NULL)
1316                 return (ENOBUFS);
1317         m->m_len = hlen;
1318         if (hdr)
1319                 bcopy(hdr, mtod(m, caddr_t), hlen);
1320
1321         *mp = m;
1322         return (0);
1323 }
1324
1325 /*
1326  * Insert jumbo payload option.
1327  */
1328 static int
1329 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1330 {
1331         struct mbuf *mopt;
1332         u_char *optbuf;
1333         u_int32_t v;
1334
1335 #define JUMBOOPTLEN     8       /* length of jumbo payload option and padding */
1336
1337         /*
1338          * If there is no hop-by-hop options header, allocate new one.
1339          * If there is one but it doesn't have enough space to store the
1340          * jumbo payload option, allocate a cluster to store the whole options.
1341          * Otherwise, use it to store the options.
1342          */
1343         if (exthdrs->ip6e_hbh == NULL) {
1344                 mopt = m_get(M_NOWAIT, MT_DATA);
1345                 if (mopt == NULL)
1346                         return (ENOBUFS);
1347                 mopt->m_len = JUMBOOPTLEN;
1348                 optbuf = mtod(mopt, u_char *);
1349                 optbuf[1] = 0;  /* = ((JUMBOOPTLEN) >> 3) - 1 */
1350                 exthdrs->ip6e_hbh = mopt;
1351         } else {
1352                 struct ip6_hbh *hbh;
1353
1354                 mopt = exthdrs->ip6e_hbh;
1355                 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1356                         /*
1357                          * XXX assumption:
1358                          * - exthdrs->ip6e_hbh is not referenced from places
1359                          *   other than exthdrs.
1360                          * - exthdrs->ip6e_hbh is not an mbuf chain.
1361                          */
1362                         int oldoptlen = mopt->m_len;
1363                         struct mbuf *n;
1364
1365                         /*
1366                          * XXX: give up if the whole (new) hbh header does
1367                          * not fit even in an mbuf cluster.
1368                          */
1369                         if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1370                                 return (ENOBUFS);
1371
1372                         /*
1373                          * As a consequence, we must always prepare a cluster
1374                          * at this point.
1375                          */
1376                         n = m_getcl(M_NOWAIT, MT_DATA, 0);
1377                         if (n == NULL)
1378                                 return (ENOBUFS);
1379                         n->m_len = oldoptlen + JUMBOOPTLEN;
1380                         bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1381                             oldoptlen);
1382                         optbuf = mtod(n, caddr_t) + oldoptlen;
1383                         m_freem(mopt);
1384                         mopt = exthdrs->ip6e_hbh = n;
1385                 } else {
1386                         optbuf = mtod(mopt, u_char *) + mopt->m_len;
1387                         mopt->m_len += JUMBOOPTLEN;
1388                 }
1389                 optbuf[0] = IP6OPT_PADN;
1390                 optbuf[1] = 1;
1391
1392                 /*
1393                  * Adjust the header length according to the pad and
1394                  * the jumbo payload option.
1395                  */
1396                 hbh = mtod(mopt, struct ip6_hbh *);
1397                 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1398         }
1399
1400         /* fill in the option. */
1401         optbuf[2] = IP6OPT_JUMBO;
1402         optbuf[3] = 4;
1403         v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1404         bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1405
1406         /* finally, adjust the packet header length */
1407         exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1408
1409         return (0);
1410 #undef JUMBOOPTLEN
1411 }
1412
1413 /*
1414  * Insert fragment header and copy unfragmentable header portions.
1415  */
1416 static int
1417 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1418     struct ip6_frag **frghdrp)
1419 {
1420         struct mbuf *n, *mlast;
1421
1422         if (hlen > sizeof(struct ip6_hdr)) {
1423                 n = m_copym(m0, sizeof(struct ip6_hdr),
1424                     hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1425                 if (n == NULL)
1426                         return (ENOBUFS);
1427                 m->m_next = n;
1428         } else
1429                 n = m;
1430
1431         /* Search for the last mbuf of unfragmentable part. */
1432         for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1433                 ;
1434
1435         if (M_WRITABLE(mlast) &&
1436             M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1437                 /* use the trailing space of the last mbuf for the fragment hdr */
1438                 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1439                     mlast->m_len);
1440                 mlast->m_len += sizeof(struct ip6_frag);
1441                 m->m_pkthdr.len += sizeof(struct ip6_frag);
1442         } else {
1443                 /* allocate a new mbuf for the fragment header */
1444                 struct mbuf *mfrg;
1445
1446                 mfrg = m_get(M_NOWAIT, MT_DATA);
1447                 if (mfrg == NULL)
1448                         return (ENOBUFS);
1449                 mfrg->m_len = sizeof(struct ip6_frag);
1450                 *frghdrp = mtod(mfrg, struct ip6_frag *);
1451                 mlast->m_next = mfrg;
1452         }
1453
1454         return (0);
1455 }
1456
1457 /*
1458  * Calculates IPv6 path mtu for destination @dst.
1459  * Resulting MTU is stored in @mtup.
1460  *
1461  * Returns 0 on success.
1462  */
1463 static int
1464 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup)
1465 {
1466         struct epoch_tracker et;
1467         struct nhop_object *nh;
1468         struct in6_addr kdst;
1469         uint32_t scopeid;
1470         int error;
1471
1472         in6_splitscope(dst, &kdst, &scopeid);
1473
1474         NET_EPOCH_ENTER(et);
1475         nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0);
1476         if (nh != NULL)
1477                 error = ip6_calcmtu(nh->nh_ifp, dst, nh->nh_mtu, mtup, NULL, 0);
1478         else
1479                 error = EHOSTUNREACH;
1480         NET_EPOCH_EXIT(et);
1481
1482         return (error);
1483 }
1484
1485 /*
1486  * Calculates IPv6 path MTU for @dst based on transmit @ifp,
1487  * and cached data in @ro_pmtu.
1488  * MTU from (successful) route lookup is saved (along with dst)
1489  * inside @ro_pmtu to avoid subsequent route lookups after packet
1490  * filter processing.
1491  *
1492  * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1493  * Returns 0 on success.
1494  */
1495 static int
1496 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup,
1497     struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup,
1498     int *alwaysfragp, u_int fibnum, u_int proto)
1499 {
1500         struct nhop_object *nh;
1501         struct in6_addr kdst;
1502         uint32_t scopeid;
1503         struct sockaddr_in6 *sa6_dst, sin6;
1504         u_long mtu;
1505
1506         NET_EPOCH_ASSERT();
1507
1508         mtu = 0;
1509         if (ro_pmtu == NULL || do_lookup) {
1510                 /*
1511                  * Here ro_pmtu has final destination address, while
1512                  * ro might represent immediate destination.
1513                  * Use ro_pmtu destination since mtu might differ.
1514                  */
1515                 if (ro_pmtu != NULL) {
1516                         sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1517                         if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))
1518                                 ro_pmtu->ro_mtu = 0;
1519                 } else
1520                         sa6_dst = &sin6;
1521
1522                 if (ro_pmtu == NULL || ro_pmtu->ro_mtu == 0) {
1523                         bzero(sa6_dst, sizeof(*sa6_dst));
1524                         sa6_dst->sin6_family = AF_INET6;
1525                         sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1526                         sa6_dst->sin6_addr = *dst;
1527
1528                         in6_splitscope(dst, &kdst, &scopeid);
1529                         nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0);
1530                         if (nh != NULL) {
1531                                 mtu = nh->nh_mtu;
1532                                 if (ro_pmtu != NULL)
1533                                         ro_pmtu->ro_mtu = mtu;
1534                         }
1535                 } else
1536                         mtu = ro_pmtu->ro_mtu;
1537         }
1538
1539         if (ro_pmtu != NULL && ro_pmtu->ro_nh != NULL)
1540                 mtu = ro_pmtu->ro_nh->nh_mtu;
1541
1542         return (ip6_calcmtu(ifp, dst, mtu, mtup, alwaysfragp, proto));
1543 }
1544
1545 /*
1546  * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and
1547  * hostcache data for @dst.
1548  * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1549  *
1550  * Returns 0 on success.
1551  */
1552 static int
1553 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu,
1554     u_long *mtup, int *alwaysfragp, u_int proto)
1555 {
1556         u_long mtu = 0;
1557         int alwaysfrag = 0;
1558         int error = 0;
1559
1560         if (rt_mtu > 0) {
1561                 u_int32_t ifmtu;
1562                 struct in_conninfo inc;
1563
1564                 bzero(&inc, sizeof(inc));
1565                 inc.inc_flags |= INC_ISIPV6;
1566                 inc.inc6_faddr = *dst;
1567
1568                 ifmtu = IN6_LINKMTU(ifp);
1569
1570                 /* TCP is known to react to pmtu changes so skip hc */
1571                 if (proto != IPPROTO_TCP)
1572                         mtu = tcp_hc_getmtu(&inc);
1573
1574                 if (mtu)
1575                         mtu = min(mtu, rt_mtu);
1576                 else
1577                         mtu = rt_mtu;
1578                 if (mtu == 0)
1579                         mtu = ifmtu;
1580                 else if (mtu < IPV6_MMTU) {
1581                         /*
1582                          * RFC2460 section 5, last paragraph:
1583                          * if we record ICMPv6 too big message with
1584                          * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1585                          * or smaller, with framgent header attached.
1586                          * (fragment header is needed regardless from the
1587                          * packet size, for translators to identify packets)
1588                          */
1589                         alwaysfrag = 1;
1590                         mtu = IPV6_MMTU;
1591                 }
1592         } else if (ifp) {
1593                 mtu = IN6_LINKMTU(ifp);
1594         } else
1595                 error = EHOSTUNREACH; /* XXX */
1596
1597         *mtup = mtu;
1598         if (alwaysfragp)
1599                 *alwaysfragp = alwaysfrag;
1600         return (error);
1601 }
1602
1603 /*
1604  * IP6 socket option processing.
1605  */
1606 int
1607 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1608 {
1609         int optdatalen, uproto;
1610         void *optdata;
1611         struct inpcb *inp = sotoinpcb(so);
1612         int error, optval;
1613         int level, op, optname;
1614         int optlen;
1615         struct thread *td;
1616 #ifdef  RSS
1617         uint32_t rss_bucket;
1618         int retval;
1619 #endif
1620
1621 /*
1622  * Don't use more than a quarter of mbuf clusters.  N.B.:
1623  * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow
1624  * on LP64 architectures, so cast to u_long to avoid undefined
1625  * behavior.  ILP32 architectures cannot have nmbclusters
1626  * large enough to overflow for other reasons.
1627  */
1628 #define IPV6_PKTOPTIONS_MBUF_LIMIT      ((u_long)nmbclusters * MCLBYTES / 4)
1629
1630         level = sopt->sopt_level;
1631         op = sopt->sopt_dir;
1632         optname = sopt->sopt_name;
1633         optlen = sopt->sopt_valsize;
1634         td = sopt->sopt_td;
1635         error = 0;
1636         optval = 0;
1637         uproto = (int)so->so_proto->pr_protocol;
1638
1639         if (level != IPPROTO_IPV6) {
1640                 error = EINVAL;
1641
1642                 if (sopt->sopt_level == SOL_SOCKET &&
1643                     sopt->sopt_dir == SOPT_SET) {
1644                         switch (sopt->sopt_name) {
1645                         case SO_SETFIB:
1646                                 INP_WLOCK(inp);
1647                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
1648                                 INP_WUNLOCK(inp);
1649                                 error = 0;
1650                                 break;
1651                         case SO_MAX_PACING_RATE:
1652 #ifdef RATELIMIT
1653                                 INP_WLOCK(inp);
1654                                 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1655                                 INP_WUNLOCK(inp);
1656                                 error = 0;
1657 #else
1658                                 error = EOPNOTSUPP;
1659 #endif
1660                                 break;
1661                         default:
1662                                 break;
1663                         }
1664                 }
1665         } else {                /* level == IPPROTO_IPV6 */
1666                 switch (op) {
1667                 case SOPT_SET:
1668                         switch (optname) {
1669                         case IPV6_2292PKTOPTIONS:
1670 #ifdef IPV6_PKTOPTIONS
1671                         case IPV6_PKTOPTIONS:
1672 #endif
1673                         {
1674                                 struct mbuf *m;
1675
1676                                 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) {
1677                                         printf("ip6_ctloutput: mbuf limit hit\n");
1678                                         error = ENOBUFS;
1679                                         break;
1680                                 }
1681
1682                                 error = soopt_getm(sopt, &m); /* XXX */
1683                                 if (error != 0)
1684                                         break;
1685                                 error = soopt_mcopyin(sopt, m); /* XXX */
1686                                 if (error != 0)
1687                                         break;
1688                                 INP_WLOCK(inp);
1689                                 error = ip6_pcbopts(&inp->in6p_outputopts, m,
1690                                     so, sopt);
1691                                 INP_WUNLOCK(inp);
1692                                 m_freem(m); /* XXX */
1693                                 break;
1694                         }
1695
1696                         /*
1697                          * Use of some Hop-by-Hop options or some
1698                          * Destination options, might require special
1699                          * privilege.  That is, normal applications
1700                          * (without special privilege) might be forbidden
1701                          * from setting certain options in outgoing packets,
1702                          * and might never see certain options in received
1703                          * packets. [RFC 2292 Section 6]
1704                          * KAME specific note:
1705                          *  KAME prevents non-privileged users from sending or
1706                          *  receiving ANY hbh/dst options in order to avoid
1707                          *  overhead of parsing options in the kernel.
1708                          */
1709                         case IPV6_RECVHOPOPTS:
1710                         case IPV6_RECVDSTOPTS:
1711                         case IPV6_RECVRTHDRDSTOPTS:
1712                                 if (td != NULL) {
1713                                         error = priv_check(td,
1714                                             PRIV_NETINET_SETHDROPTS);
1715                                         if (error)
1716                                                 break;
1717                                 }
1718                                 /* FALLTHROUGH */
1719                         case IPV6_UNICAST_HOPS:
1720                         case IPV6_HOPLIMIT:
1721
1722                         case IPV6_RECVPKTINFO:
1723                         case IPV6_RECVHOPLIMIT:
1724                         case IPV6_RECVRTHDR:
1725                         case IPV6_RECVPATHMTU:
1726                         case IPV6_RECVTCLASS:
1727                         case IPV6_RECVFLOWID:
1728 #ifdef  RSS
1729                         case IPV6_RECVRSSBUCKETID:
1730 #endif
1731                         case IPV6_V6ONLY:
1732                         case IPV6_AUTOFLOWLABEL:
1733                         case IPV6_ORIGDSTADDR:
1734                         case IPV6_BINDANY:
1735                         case IPV6_VLAN_PCP:
1736                                 if (optname == IPV6_BINDANY && td != NULL) {
1737                                         error = priv_check(td,
1738                                             PRIV_NETINET_BINDANY);
1739                                         if (error)
1740                                                 break;
1741                                 }
1742
1743                                 if (optlen != sizeof(int)) {
1744                                         error = EINVAL;
1745                                         break;
1746                                 }
1747                                 error = sooptcopyin(sopt, &optval,
1748                                         sizeof optval, sizeof optval);
1749                                 if (error)
1750                                         break;
1751                                 switch (optname) {
1752                                 case IPV6_UNICAST_HOPS:
1753                                         if (optval < -1 || optval >= 256)
1754                                                 error = EINVAL;
1755                                         else {
1756                                                 /* -1 = kernel default */
1757                                                 inp->in6p_hops = optval;
1758                                                 if ((inp->inp_vflag &
1759                                                      INP_IPV4) != 0)
1760                                                         inp->inp_ip_ttl = optval;
1761                                         }
1762                                         break;
1763 #define OPTSET(bit) \
1764 do { \
1765         INP_WLOCK(inp); \
1766         if (optval) \
1767                 inp->inp_flags |= (bit); \
1768         else \
1769                 inp->inp_flags &= ~(bit); \
1770         INP_WUNLOCK(inp); \
1771 } while (/*CONSTCOND*/ 0)
1772 #define OPTSET2292(bit) \
1773 do { \
1774         INP_WLOCK(inp); \
1775         inp->inp_flags |= IN6P_RFC2292; \
1776         if (optval) \
1777                 inp->inp_flags |= (bit); \
1778         else \
1779                 inp->inp_flags &= ~(bit); \
1780         INP_WUNLOCK(inp); \
1781 } while (/*CONSTCOND*/ 0)
1782 #define OPTBIT(bit) (inp->inp_flags & (bit) ? 1 : 0)
1783
1784 #define OPTSET2_N(bit, val) do {                                        \
1785         if (val)                                                        \
1786                 inp->inp_flags2 |= bit;                                 \
1787         else                                                            \
1788                 inp->inp_flags2 &= ~bit;                                \
1789 } while (0)
1790 #define OPTSET2(bit, val) do {                                          \
1791         INP_WLOCK(inp);                                                 \
1792         OPTSET2_N(bit, val);                                            \
1793         INP_WUNLOCK(inp);                                               \
1794 } while (0)
1795 #define OPTBIT2(bit) (inp->inp_flags2 & (bit) ? 1 : 0)
1796 #define OPTSET2292_EXCLUSIVE(bit)                                       \
1797 do {                                                                    \
1798         INP_WLOCK(inp);                                                 \
1799         if (OPTBIT(IN6P_RFC2292)) {                                     \
1800                 error = EINVAL;                                         \
1801         } else {                                                        \
1802                 if (optval)                                             \
1803                         inp->inp_flags |= (bit);                        \
1804                 else                                                    \
1805                         inp->inp_flags &= ~(bit);                       \
1806         }                                                               \
1807         INP_WUNLOCK(inp);                                               \
1808 } while (/*CONSTCOND*/ 0)
1809
1810                                 case IPV6_RECVPKTINFO:
1811                                         OPTSET2292_EXCLUSIVE(IN6P_PKTINFO);
1812                                         break;
1813
1814                                 case IPV6_HOPLIMIT:
1815                                 {
1816                                         struct ip6_pktopts **optp;
1817
1818                                         /* cannot mix with RFC2292 */
1819                                         if (OPTBIT(IN6P_RFC2292)) {
1820                                                 error = EINVAL;
1821                                                 break;
1822                                         }
1823                                         INP_WLOCK(inp);
1824                                         if (inp->inp_flags & INP_DROPPED) {
1825                                                 INP_WUNLOCK(inp);
1826                                                 return (ECONNRESET);
1827                                         }
1828                                         optp = &inp->in6p_outputopts;
1829                                         error = ip6_pcbopt(IPV6_HOPLIMIT,
1830                                             (u_char *)&optval, sizeof(optval),
1831                                             optp, (td != NULL) ? td->td_ucred :
1832                                             NULL, uproto);
1833                                         INP_WUNLOCK(inp);
1834                                         break;
1835                                 }
1836
1837                                 case IPV6_RECVHOPLIMIT:
1838                                         OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT);
1839                                         break;
1840
1841                                 case IPV6_RECVHOPOPTS:
1842                                         OPTSET2292_EXCLUSIVE(IN6P_HOPOPTS);
1843                                         break;
1844
1845                                 case IPV6_RECVDSTOPTS:
1846                                         OPTSET2292_EXCLUSIVE(IN6P_DSTOPTS);
1847                                         break;
1848
1849                                 case IPV6_RECVRTHDRDSTOPTS:
1850                                         OPTSET2292_EXCLUSIVE(IN6P_RTHDRDSTOPTS);
1851                                         break;
1852
1853                                 case IPV6_RECVRTHDR:
1854                                         OPTSET2292_EXCLUSIVE(IN6P_RTHDR);
1855                                         break;
1856
1857                                 case IPV6_RECVPATHMTU:
1858                                         /*
1859                                          * We ignore this option for TCP
1860                                          * sockets.
1861                                          * (RFC3542 leaves this case
1862                                          * unspecified.)
1863                                          */
1864                                         if (uproto != IPPROTO_TCP)
1865                                                 OPTSET(IN6P_MTU);
1866                                         break;
1867
1868                                 case IPV6_RECVFLOWID:
1869                                         OPTSET2(INP_RECVFLOWID, optval);
1870                                         break;
1871
1872 #ifdef  RSS
1873                                 case IPV6_RECVRSSBUCKETID:
1874                                         OPTSET2(INP_RECVRSSBUCKETID, optval);
1875                                         break;
1876 #endif
1877
1878                                 case IPV6_V6ONLY:
1879                                         INP_WLOCK(inp);
1880                                         if (inp->inp_lport ||
1881                                             !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1882                                                 /*
1883                                                  * The socket is already bound.
1884                                                  */
1885                                                 INP_WUNLOCK(inp);
1886                                                 error = EINVAL;
1887                                                 break;
1888                                         }
1889                                         if (optval) {
1890                                                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
1891                                                 inp->inp_vflag &= ~INP_IPV4;
1892                                         } else {
1893                                                 inp->inp_flags &= ~IN6P_IPV6_V6ONLY;
1894                                                 inp->inp_vflag |= INP_IPV4;
1895                                         }
1896                                         INP_WUNLOCK(inp);
1897                                         break;
1898                                 case IPV6_RECVTCLASS:
1899                                         /* cannot mix with RFC2292 XXX */
1900                                         OPTSET2292_EXCLUSIVE(IN6P_TCLASS);
1901                                         break;
1902                                 case IPV6_AUTOFLOWLABEL:
1903                                         OPTSET(IN6P_AUTOFLOWLABEL);
1904                                         break;
1905
1906                                 case IPV6_ORIGDSTADDR:
1907                                         OPTSET2(INP_ORIGDSTADDR, optval);
1908                                         break;
1909                                 case IPV6_BINDANY:
1910                                         OPTSET(INP_BINDANY);
1911                                         break;
1912                                 case IPV6_VLAN_PCP:
1913                                         if ((optval >= -1) && (optval <=
1914                                             (INP_2PCP_MASK >> INP_2PCP_SHIFT))) {
1915                                                 if (optval == -1) {
1916                                                         INP_WLOCK(inp);
1917                                                         inp->inp_flags2 &=
1918                                                             ~(INP_2PCP_SET |
1919                                                             INP_2PCP_MASK);
1920                                                         INP_WUNLOCK(inp);
1921                                                 } else {
1922                                                         INP_WLOCK(inp);
1923                                                         inp->inp_flags2 |=
1924                                                             INP_2PCP_SET;
1925                                                         inp->inp_flags2 &=
1926                                                             ~INP_2PCP_MASK;
1927                                                         inp->inp_flags2 |=
1928                                                             optval <<
1929                                                             INP_2PCP_SHIFT;
1930                                                         INP_WUNLOCK(inp);
1931                                                 }
1932                                         } else
1933                                                 error = EINVAL;
1934                                         break;
1935                                 }
1936                                 break;
1937
1938                         case IPV6_TCLASS:
1939                         case IPV6_DONTFRAG:
1940                         case IPV6_USE_MIN_MTU:
1941                         case IPV6_PREFER_TEMPADDR:
1942                                 if (optlen != sizeof(optval)) {
1943                                         error = EINVAL;
1944                                         break;
1945                                 }
1946                                 error = sooptcopyin(sopt, &optval,
1947                                         sizeof optval, sizeof optval);
1948                                 if (error)
1949                                         break;
1950                                 {
1951                                         struct ip6_pktopts **optp;
1952                                         INP_WLOCK(inp);
1953                                         if (inp->inp_flags & INP_DROPPED) {
1954                                                 INP_WUNLOCK(inp);
1955                                                 return (ECONNRESET);
1956                                         }
1957                                         optp = &inp->in6p_outputopts;
1958                                         error = ip6_pcbopt(optname,
1959                                             (u_char *)&optval, sizeof(optval),
1960                                             optp, (td != NULL) ? td->td_ucred :
1961                                             NULL, uproto);
1962                                         INP_WUNLOCK(inp);
1963                                         break;
1964                                 }
1965
1966                         case IPV6_2292PKTINFO:
1967                         case IPV6_2292HOPLIMIT:
1968                         case IPV6_2292HOPOPTS:
1969                         case IPV6_2292DSTOPTS:
1970                         case IPV6_2292RTHDR:
1971                                 /* RFC 2292 */
1972                                 if (optlen != sizeof(int)) {
1973                                         error = EINVAL;
1974                                         break;
1975                                 }
1976                                 error = sooptcopyin(sopt, &optval,
1977                                         sizeof optval, sizeof optval);
1978                                 if (error)
1979                                         break;
1980                                 switch (optname) {
1981                                 case IPV6_2292PKTINFO:
1982                                         OPTSET2292(IN6P_PKTINFO);
1983                                         break;
1984                                 case IPV6_2292HOPLIMIT:
1985                                         OPTSET2292(IN6P_HOPLIMIT);
1986                                         break;
1987                                 case IPV6_2292HOPOPTS:
1988                                         /*
1989                                          * Check super-user privilege.
1990                                          * See comments for IPV6_RECVHOPOPTS.
1991                                          */
1992                                         if (td != NULL) {
1993                                                 error = priv_check(td,
1994                                                     PRIV_NETINET_SETHDROPTS);
1995                                                 if (error)
1996                                                         return (error);
1997                                         }
1998                                         OPTSET2292(IN6P_HOPOPTS);
1999                                         break;
2000                                 case IPV6_2292DSTOPTS:
2001                                         if (td != NULL) {
2002                                                 error = priv_check(td,
2003                                                     PRIV_NETINET_SETHDROPTS);
2004                                                 if (error)
2005                                                         return (error);
2006                                         }
2007                                         OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
2008                                         break;
2009                                 case IPV6_2292RTHDR:
2010                                         OPTSET2292(IN6P_RTHDR);
2011                                         break;
2012                                 }
2013                                 break;
2014                         case IPV6_PKTINFO:
2015                         case IPV6_HOPOPTS:
2016                         case IPV6_RTHDR:
2017                         case IPV6_DSTOPTS:
2018                         case IPV6_RTHDRDSTOPTS:
2019                         case IPV6_NEXTHOP:
2020                         {
2021                                 /* new advanced API (RFC3542) */
2022                                 u_char *optbuf;
2023                                 u_char optbuf_storage[MCLBYTES];
2024                                 int optlen;
2025                                 struct ip6_pktopts **optp;
2026
2027                                 /* cannot mix with RFC2292 */
2028                                 if (OPTBIT(IN6P_RFC2292)) {
2029                                         error = EINVAL;
2030                                         break;
2031                                 }
2032
2033                                 /*
2034                                  * We only ensure valsize is not too large
2035                                  * here.  Further validation will be done
2036                                  * later.
2037                                  */
2038                                 error = sooptcopyin(sopt, optbuf_storage,
2039                                     sizeof(optbuf_storage), 0);
2040                                 if (error)
2041                                         break;
2042                                 optlen = sopt->sopt_valsize;
2043                                 optbuf = optbuf_storage;
2044                                 INP_WLOCK(inp);
2045                                 if (inp->inp_flags & INP_DROPPED) {
2046                                         INP_WUNLOCK(inp);
2047                                         return (ECONNRESET);
2048                                 }
2049                                 optp = &inp->in6p_outputopts;
2050                                 error = ip6_pcbopt(optname, optbuf, optlen,
2051                                     optp, (td != NULL) ? td->td_ucred : NULL,
2052                                     uproto);
2053                                 INP_WUNLOCK(inp);
2054                                 break;
2055                         }
2056 #undef OPTSET
2057
2058                         case IPV6_MULTICAST_IF:
2059                         case IPV6_MULTICAST_HOPS:
2060                         case IPV6_MULTICAST_LOOP:
2061                         case IPV6_JOIN_GROUP:
2062                         case IPV6_LEAVE_GROUP:
2063                         case IPV6_MSFILTER:
2064                         case MCAST_BLOCK_SOURCE:
2065                         case MCAST_UNBLOCK_SOURCE:
2066                         case MCAST_JOIN_GROUP:
2067                         case MCAST_LEAVE_GROUP:
2068                         case MCAST_JOIN_SOURCE_GROUP:
2069                         case MCAST_LEAVE_SOURCE_GROUP:
2070                                 error = ip6_setmoptions(inp, sopt);
2071                                 break;
2072
2073                         case IPV6_PORTRANGE:
2074                                 error = sooptcopyin(sopt, &optval,
2075                                     sizeof optval, sizeof optval);
2076                                 if (error)
2077                                         break;
2078
2079                                 INP_WLOCK(inp);
2080                                 switch (optval) {
2081                                 case IPV6_PORTRANGE_DEFAULT:
2082                                         inp->inp_flags &= ~(INP_LOWPORT);
2083                                         inp->inp_flags &= ~(INP_HIGHPORT);
2084                                         break;
2085
2086                                 case IPV6_PORTRANGE_HIGH:
2087                                         inp->inp_flags &= ~(INP_LOWPORT);
2088                                         inp->inp_flags |= INP_HIGHPORT;
2089                                         break;
2090
2091                                 case IPV6_PORTRANGE_LOW:
2092                                         inp->inp_flags &= ~(INP_HIGHPORT);
2093                                         inp->inp_flags |= INP_LOWPORT;
2094                                         break;
2095
2096                                 default:
2097                                         error = EINVAL;
2098                                         break;
2099                                 }
2100                                 INP_WUNLOCK(inp);
2101                                 break;
2102
2103 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
2104                         case IPV6_IPSEC_POLICY:
2105                                 if (IPSEC_ENABLED(ipv6)) {
2106                                         error = IPSEC_PCBCTL(ipv6, inp, sopt);
2107                                         break;
2108                                 }
2109                                 /* FALLTHROUGH */
2110 #endif /* IPSEC */
2111
2112                         default:
2113                                 error = ENOPROTOOPT;
2114                                 break;
2115                         }
2116                         break;
2117
2118                 case SOPT_GET:
2119                         switch (optname) {
2120                         case IPV6_2292PKTOPTIONS:
2121 #ifdef IPV6_PKTOPTIONS
2122                         case IPV6_PKTOPTIONS:
2123 #endif
2124                                 /*
2125                                  * RFC3542 (effectively) deprecated the
2126                                  * semantics of the 2292-style pktoptions.
2127                                  * Since it was not reliable in nature (i.e.,
2128                                  * applications had to expect the lack of some
2129                                  * information after all), it would make sense
2130                                  * to simplify this part by always returning
2131                                  * empty data.
2132                                  */
2133                                 sopt->sopt_valsize = 0;
2134                                 break;
2135
2136                         case IPV6_RECVHOPOPTS:
2137                         case IPV6_RECVDSTOPTS:
2138                         case IPV6_RECVRTHDRDSTOPTS:
2139                         case IPV6_UNICAST_HOPS:
2140                         case IPV6_RECVPKTINFO:
2141                         case IPV6_RECVHOPLIMIT:
2142                         case IPV6_RECVRTHDR:
2143                         case IPV6_RECVPATHMTU:
2144
2145                         case IPV6_V6ONLY:
2146                         case IPV6_PORTRANGE:
2147                         case IPV6_RECVTCLASS:
2148                         case IPV6_AUTOFLOWLABEL:
2149                         case IPV6_BINDANY:
2150                         case IPV6_FLOWID:
2151                         case IPV6_FLOWTYPE:
2152                         case IPV6_RECVFLOWID:
2153 #ifdef  RSS
2154                         case IPV6_RSSBUCKETID:
2155                         case IPV6_RECVRSSBUCKETID:
2156 #endif
2157                         case IPV6_VLAN_PCP:
2158                                 switch (optname) {
2159                                 case IPV6_RECVHOPOPTS:
2160                                         optval = OPTBIT(IN6P_HOPOPTS);
2161                                         break;
2162
2163                                 case IPV6_RECVDSTOPTS:
2164                                         optval = OPTBIT(IN6P_DSTOPTS);
2165                                         break;
2166
2167                                 case IPV6_RECVRTHDRDSTOPTS:
2168                                         optval = OPTBIT(IN6P_RTHDRDSTOPTS);
2169                                         break;
2170
2171                                 case IPV6_UNICAST_HOPS:
2172                                         optval = inp->in6p_hops;
2173                                         break;
2174
2175                                 case IPV6_RECVPKTINFO:
2176                                         optval = OPTBIT(IN6P_PKTINFO);
2177                                         break;
2178
2179                                 case IPV6_RECVHOPLIMIT:
2180                                         optval = OPTBIT(IN6P_HOPLIMIT);
2181                                         break;
2182
2183                                 case IPV6_RECVRTHDR:
2184                                         optval = OPTBIT(IN6P_RTHDR);
2185                                         break;
2186
2187                                 case IPV6_RECVPATHMTU:
2188                                         optval = OPTBIT(IN6P_MTU);
2189                                         break;
2190
2191                                 case IPV6_V6ONLY:
2192                                         optval = OPTBIT(IN6P_IPV6_V6ONLY);
2193                                         break;
2194
2195                                 case IPV6_PORTRANGE:
2196                                     {
2197                                         int flags;
2198                                         flags = inp->inp_flags;
2199                                         if (flags & INP_HIGHPORT)
2200                                                 optval = IPV6_PORTRANGE_HIGH;
2201                                         else if (flags & INP_LOWPORT)
2202                                                 optval = IPV6_PORTRANGE_LOW;
2203                                         else
2204                                                 optval = 0;
2205                                         break;
2206                                     }
2207                                 case IPV6_RECVTCLASS:
2208                                         optval = OPTBIT(IN6P_TCLASS);
2209                                         break;
2210
2211                                 case IPV6_AUTOFLOWLABEL:
2212                                         optval = OPTBIT(IN6P_AUTOFLOWLABEL);
2213                                         break;
2214
2215                                 case IPV6_ORIGDSTADDR:
2216                                         optval = OPTBIT2(INP_ORIGDSTADDR);
2217                                         break;
2218
2219                                 case IPV6_BINDANY:
2220                                         optval = OPTBIT(INP_BINDANY);
2221                                         break;
2222
2223                                 case IPV6_FLOWID:
2224                                         optval = inp->inp_flowid;
2225                                         break;
2226
2227                                 case IPV6_FLOWTYPE:
2228                                         optval = inp->inp_flowtype;
2229                                         break;
2230
2231                                 case IPV6_RECVFLOWID:
2232                                         optval = OPTBIT2(INP_RECVFLOWID);
2233                                         break;
2234 #ifdef  RSS
2235                                 case IPV6_RSSBUCKETID:
2236                                         retval =
2237                                             rss_hash2bucket(inp->inp_flowid,
2238                                             inp->inp_flowtype,
2239                                             &rss_bucket);
2240                                         if (retval == 0)
2241                                                 optval = rss_bucket;
2242                                         else
2243                                                 error = EINVAL;
2244                                         break;
2245
2246                                 case IPV6_RECVRSSBUCKETID:
2247                                         optval = OPTBIT2(INP_RECVRSSBUCKETID);
2248                                         break;
2249 #endif
2250
2251
2252                                 case IPV6_VLAN_PCP:
2253                                         if (OPTBIT2(INP_2PCP_SET)) {
2254                                                 optval = (inp->inp_flags2 &
2255                                                             INP_2PCP_MASK) >>
2256                                                             INP_2PCP_SHIFT;
2257                                         } else {
2258                                                 optval = -1;
2259                                         }
2260                                         break;
2261                                 }
2262
2263                                 if (error)
2264                                         break;
2265                                 error = sooptcopyout(sopt, &optval,
2266                                         sizeof optval);
2267                                 break;
2268
2269                         case IPV6_PATHMTU:
2270                         {
2271                                 u_long pmtu = 0;
2272                                 struct ip6_mtuinfo mtuinfo;
2273                                 struct in6_addr addr;
2274
2275                                 if (!(so->so_state & SS_ISCONNECTED))
2276                                         return (ENOTCONN);
2277                                 /*
2278                                  * XXX: we dot not consider the case of source
2279                                  * routing, or optional information to specify
2280                                  * the outgoing interface.
2281                                  * Copy faddr out of inp to avoid holding lock
2282                                  * on inp during route lookup.
2283                                  */
2284                                 INP_RLOCK(inp);
2285                                 bcopy(&inp->in6p_faddr, &addr, sizeof(addr));
2286                                 INP_RUNLOCK(inp);
2287                                 error = ip6_getpmtu_ctl(so->so_fibnum,
2288                                     &addr, &pmtu);
2289                                 if (error)
2290                                         break;
2291                                 if (pmtu > IPV6_MAXPACKET)
2292                                         pmtu = IPV6_MAXPACKET;
2293
2294                                 bzero(&mtuinfo, sizeof(mtuinfo));
2295                                 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
2296                                 optdata = (void *)&mtuinfo;
2297                                 optdatalen = sizeof(mtuinfo);
2298                                 error = sooptcopyout(sopt, optdata,
2299                                     optdatalen);
2300                                 break;
2301                         }
2302
2303                         case IPV6_2292PKTINFO:
2304                         case IPV6_2292HOPLIMIT:
2305                         case IPV6_2292HOPOPTS:
2306                         case IPV6_2292RTHDR:
2307                         case IPV6_2292DSTOPTS:
2308                                 switch (optname) {
2309                                 case IPV6_2292PKTINFO:
2310                                         optval = OPTBIT(IN6P_PKTINFO);
2311                                         break;
2312                                 case IPV6_2292HOPLIMIT:
2313                                         optval = OPTBIT(IN6P_HOPLIMIT);
2314                                         break;
2315                                 case IPV6_2292HOPOPTS:
2316                                         optval = OPTBIT(IN6P_HOPOPTS);
2317                                         break;
2318                                 case IPV6_2292RTHDR:
2319                                         optval = OPTBIT(IN6P_RTHDR);
2320                                         break;
2321                                 case IPV6_2292DSTOPTS:
2322                                         optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
2323                                         break;
2324                                 }
2325                                 error = sooptcopyout(sopt, &optval,
2326                                     sizeof optval);
2327                                 break;
2328                         case IPV6_PKTINFO:
2329                         case IPV6_HOPOPTS:
2330                         case IPV6_RTHDR:
2331                         case IPV6_DSTOPTS:
2332                         case IPV6_RTHDRDSTOPTS:
2333                         case IPV6_NEXTHOP:
2334                         case IPV6_TCLASS:
2335                         case IPV6_DONTFRAG:
2336                         case IPV6_USE_MIN_MTU:
2337                         case IPV6_PREFER_TEMPADDR:
2338                                 error = ip6_getpcbopt(inp, optname, sopt);
2339                                 break;
2340
2341                         case IPV6_MULTICAST_IF:
2342                         case IPV6_MULTICAST_HOPS:
2343                         case IPV6_MULTICAST_LOOP:
2344                         case IPV6_MSFILTER:
2345                                 error = ip6_getmoptions(inp, sopt);
2346                                 break;
2347
2348 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
2349                         case IPV6_IPSEC_POLICY:
2350                                 if (IPSEC_ENABLED(ipv6)) {
2351                                         error = IPSEC_PCBCTL(ipv6, inp, sopt);
2352                                         break;
2353                                 }
2354                                 /* FALLTHROUGH */
2355 #endif /* IPSEC */
2356                         default:
2357                                 error = ENOPROTOOPT;
2358                                 break;
2359                         }
2360                         break;
2361                 }
2362         }
2363         return (error);
2364 }
2365
2366 int
2367 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2368 {
2369         int error = 0, optval, optlen;
2370         const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2371         struct inpcb *inp = sotoinpcb(so);
2372         int level, op, optname;
2373
2374         level = sopt->sopt_level;
2375         op = sopt->sopt_dir;
2376         optname = sopt->sopt_name;
2377         optlen = sopt->sopt_valsize;
2378
2379         if (level != IPPROTO_IPV6) {
2380                 return (EINVAL);
2381         }
2382
2383         switch (optname) {
2384         case IPV6_CHECKSUM:
2385                 /*
2386                  * For ICMPv6 sockets, no modification allowed for checksum
2387                  * offset, permit "no change" values to help existing apps.
2388                  *
2389                  * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2390                  * for an ICMPv6 socket will fail."
2391                  * The current behavior does not meet RFC3542.
2392                  */
2393                 switch (op) {
2394                 case SOPT_SET:
2395                         if (optlen != sizeof(int)) {
2396                                 error = EINVAL;
2397                                 break;
2398                         }
2399                         error = sooptcopyin(sopt, &optval, sizeof(optval),
2400                                             sizeof(optval));
2401                         if (error)
2402                                 break;
2403                         if (optval < -1 || (optval % 2) != 0) {
2404                                 /*
2405                                  * The API assumes non-negative even offset
2406                                  * values or -1 as a special value.
2407                                  */
2408                                 error = EINVAL;
2409                         } else if (inp->inp_ip_p == IPPROTO_ICMPV6) {
2410                                 if (optval != icmp6off)
2411                                         error = EINVAL;
2412                         } else
2413                                 inp->in6p_cksum = optval;
2414                         break;
2415
2416                 case SOPT_GET:
2417                         if (inp->inp_ip_p == IPPROTO_ICMPV6)
2418                                 optval = icmp6off;
2419                         else
2420                                 optval = inp->in6p_cksum;
2421
2422                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2423                         break;
2424
2425                 default:
2426                         error = EINVAL;
2427                         break;
2428                 }
2429                 break;
2430
2431         default:
2432                 error = ENOPROTOOPT;
2433                 break;
2434         }
2435
2436         return (error);
2437 }
2438
2439 /*
2440  * Set up IP6 options in pcb for insertion in output packets or
2441  * specifying behavior of outgoing packets.
2442  */
2443 static int
2444 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2445     struct socket *so, struct sockopt *sopt)
2446 {
2447         struct ip6_pktopts *opt = *pktopt;
2448         int error = 0;
2449         struct thread *td = sopt->sopt_td;
2450         struct epoch_tracker et;
2451
2452         /* turn off any old options. */
2453         if (opt) {
2454 #ifdef DIAGNOSTIC
2455                 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2456                     opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2457                     opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2458                         printf("ip6_pcbopts: all specified options are cleared.\n");
2459 #endif
2460                 ip6_clearpktopts(opt, -1);
2461         } else {
2462                 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT);
2463                 if (opt == NULL)
2464                         return (ENOMEM);
2465         }
2466         *pktopt = NULL;
2467
2468         if (!m || m->m_len == 0) {
2469                 /*
2470                  * Only turning off any previous options, regardless of
2471                  * whether the opt is just created or given.
2472                  */
2473                 free(opt, M_IP6OPT);
2474                 return (0);
2475         }
2476
2477         /*  set options specified by user. */
2478         NET_EPOCH_ENTER(et);
2479         if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2480             td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2481                 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2482                 free(opt, M_IP6OPT);
2483                 NET_EPOCH_EXIT(et);
2484                 return (error);
2485         }
2486         NET_EPOCH_EXIT(et);
2487         *pktopt = opt;
2488         return (0);
2489 }
2490
2491 /*
2492  * initialize ip6_pktopts.  beware that there are non-zero default values in
2493  * the struct.
2494  */
2495 void
2496 ip6_initpktopts(struct ip6_pktopts *opt)
2497 {
2498
2499         bzero(opt, sizeof(*opt));
2500         opt->ip6po_hlim = -1;   /* -1 means default hop limit */
2501         opt->ip6po_tclass = -1; /* -1 means default traffic class */
2502         opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2503         opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2504 }
2505
2506 static int
2507 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2508     struct ucred *cred, int uproto)
2509 {
2510         struct epoch_tracker et;
2511         struct ip6_pktopts *opt;
2512         int ret;
2513
2514         if (*pktopt == NULL) {
2515                 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2516                     M_NOWAIT);
2517                 if (*pktopt == NULL)
2518                         return (ENOBUFS);
2519                 ip6_initpktopts(*pktopt);
2520         }
2521         opt = *pktopt;
2522
2523         NET_EPOCH_ENTER(et);
2524         ret = ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto);
2525         NET_EPOCH_EXIT(et);
2526
2527         return (ret);
2528 }
2529
2530 #define GET_PKTOPT_VAR(field, lenexpr) do {                             \
2531         if (pktopt && pktopt->field) {                                  \
2532                 INP_RUNLOCK(inp);                                       \
2533                 optdata = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK); \
2534                 malloc_optdata = true;                                  \
2535                 INP_RLOCK(inp);                                         \
2536                 if (inp->inp_flags & INP_DROPPED) {                     \
2537                         INP_RUNLOCK(inp);                               \
2538                         free(optdata, M_TEMP);                          \
2539                         return (ECONNRESET);                            \
2540                 }                                                       \
2541                 pktopt = inp->in6p_outputopts;                          \
2542                 if (pktopt && pktopt->field) {                          \
2543                         optdatalen = min(lenexpr, sopt->sopt_valsize);  \
2544                         bcopy(pktopt->field, optdata, optdatalen);      \
2545                 } else {                                                \
2546                         free(optdata, M_TEMP);                          \
2547                         optdata = NULL;                                 \
2548                         malloc_optdata = false;                         \
2549                 }                                                       \
2550         }                                                               \
2551 } while(0)
2552
2553 #define GET_PKTOPT_EXT_HDR(field) GET_PKTOPT_VAR(field,                 \
2554         (((struct ip6_ext *)pktopt->field)->ip6e_len + 1) << 3)
2555
2556 #define GET_PKTOPT_SOCKADDR(field) GET_PKTOPT_VAR(field,                \
2557         pktopt->field->sa_len)
2558
2559 static int
2560 ip6_getpcbopt(struct inpcb *inp, int optname, struct sockopt *sopt)
2561 {
2562         void *optdata = NULL;
2563         bool malloc_optdata = false;
2564         int optdatalen = 0;
2565         int error = 0;
2566         struct in6_pktinfo null_pktinfo;
2567         int deftclass = 0, on;
2568         int defminmtu = IP6PO_MINMTU_MCASTONLY;
2569         int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2570         struct ip6_pktopts *pktopt;
2571
2572         INP_RLOCK(inp);
2573         pktopt = inp->in6p_outputopts;
2574
2575         switch (optname) {
2576         case IPV6_PKTINFO:
2577                 optdata = (void *)&null_pktinfo;
2578                 if (pktopt && pktopt->ip6po_pktinfo) {
2579                         bcopy(pktopt->ip6po_pktinfo, &null_pktinfo,
2580                             sizeof(null_pktinfo));
2581                         in6_clearscope(&null_pktinfo.ipi6_addr);
2582                 } else {
2583                         /* XXX: we don't have to do this every time... */
2584                         bzero(&null_pktinfo, sizeof(null_pktinfo));
2585                 }
2586                 optdatalen = sizeof(struct in6_pktinfo);
2587                 break;
2588         case IPV6_TCLASS:
2589                 if (pktopt && pktopt->ip6po_tclass >= 0)
2590                         deftclass = pktopt->ip6po_tclass;
2591                 optdata = (void *)&deftclass;
2592                 optdatalen = sizeof(int);
2593                 break;
2594         case IPV6_HOPOPTS:
2595                 GET_PKTOPT_EXT_HDR(ip6po_hbh);
2596                 break;
2597         case IPV6_RTHDR:
2598                 GET_PKTOPT_EXT_HDR(ip6po_rthdr);
2599                 break;
2600         case IPV6_RTHDRDSTOPTS:
2601                 GET_PKTOPT_EXT_HDR(ip6po_dest1);
2602                 break;
2603         case IPV6_DSTOPTS:
2604                 GET_PKTOPT_EXT_HDR(ip6po_dest2);
2605                 break;
2606         case IPV6_NEXTHOP:
2607                 GET_PKTOPT_SOCKADDR(ip6po_nexthop);
2608                 break;
2609         case IPV6_USE_MIN_MTU:
2610                 if (pktopt)
2611                         defminmtu = pktopt->ip6po_minmtu;
2612                 optdata = (void *)&defminmtu;
2613                 optdatalen = sizeof(int);
2614                 break;
2615         case IPV6_DONTFRAG:
2616                 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2617                         on = 1;
2618                 else
2619                         on = 0;
2620                 optdata = (void *)&on;
2621                 optdatalen = sizeof(on);
2622                 break;
2623         case IPV6_PREFER_TEMPADDR:
2624                 if (pktopt)
2625                         defpreftemp = pktopt->ip6po_prefer_tempaddr;
2626                 optdata = (void *)&defpreftemp;
2627                 optdatalen = sizeof(int);
2628                 break;
2629         default:                /* should not happen */
2630 #ifdef DIAGNOSTIC
2631                 panic("ip6_getpcbopt: unexpected option\n");
2632 #endif
2633                 INP_RUNLOCK(inp);
2634                 return (ENOPROTOOPT);
2635         }
2636         INP_RUNLOCK(inp);
2637
2638         error = sooptcopyout(sopt, optdata, optdatalen);
2639         if (malloc_optdata)
2640                 free(optdata, M_TEMP);
2641
2642         return (error);
2643 }
2644
2645 void
2646 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2647 {
2648         if (pktopt == NULL)
2649                 return;
2650
2651         if (optname == -1 || optname == IPV6_PKTINFO) {
2652                 if (pktopt->ip6po_pktinfo)
2653                         free(pktopt->ip6po_pktinfo, M_IP6OPT);
2654                 pktopt->ip6po_pktinfo = NULL;
2655         }
2656         if (optname == -1 || optname == IPV6_HOPLIMIT) {
2657                 pktopt->ip6po_hlim = -1;
2658                 pktopt->ip6po_valid &= ~IP6PO_VALID_HLIM;
2659         }
2660         if (optname == -1 || optname == IPV6_TCLASS) {
2661                 pktopt->ip6po_tclass = -1;
2662                 pktopt->ip6po_valid &= ~IP6PO_VALID_TC;
2663         }
2664         if (optname == -1 || optname == IPV6_NEXTHOP) {
2665                 if (pktopt->ip6po_nextroute.ro_nh) {
2666                         NH_FREE(pktopt->ip6po_nextroute.ro_nh);
2667                         pktopt->ip6po_nextroute.ro_nh = NULL;
2668                 }
2669                 if (pktopt->ip6po_nexthop)
2670                         free(pktopt->ip6po_nexthop, M_IP6OPT);
2671                 pktopt->ip6po_nexthop = NULL;
2672                 pktopt->ip6po_valid &= ~IP6PO_VALID_NHINFO;
2673         }
2674         if (optname == -1 || optname == IPV6_HOPOPTS) {
2675                 if (pktopt->ip6po_hbh)
2676                         free(pktopt->ip6po_hbh, M_IP6OPT);
2677                 pktopt->ip6po_hbh = NULL;
2678                 pktopt->ip6po_valid &= ~IP6PO_VALID_HBH;
2679         }
2680         if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2681                 if (pktopt->ip6po_dest1)
2682                         free(pktopt->ip6po_dest1, M_IP6OPT);
2683                 pktopt->ip6po_dest1 = NULL;
2684                 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST1;
2685         }
2686         if (optname == -1 || optname == IPV6_RTHDR) {
2687                 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2688                         free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2689                 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2690                 if (pktopt->ip6po_route.ro_nh) {
2691                         NH_FREE(pktopt->ip6po_route.ro_nh);
2692                         pktopt->ip6po_route.ro_nh = NULL;
2693                 }
2694                 pktopt->ip6po_valid &= ~IP6PO_VALID_RHINFO;
2695         }
2696         if (optname == -1 || optname == IPV6_DSTOPTS) {
2697                 if (pktopt->ip6po_dest2)
2698                         free(pktopt->ip6po_dest2, M_IP6OPT);
2699                 pktopt->ip6po_dest2 = NULL;
2700                 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST2;
2701         }
2702 }
2703
2704 #define PKTOPT_EXTHDRCPY(type) \
2705 do {\
2706         if (src->type) {\
2707                 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2708                 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2709                 if (dst->type == NULL)\
2710                         goto bad;\
2711                 bcopy(src->type, dst->type, hlen);\
2712         }\
2713 } while (/*CONSTCOND*/ 0)
2714
2715 static int
2716 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2717 {
2718         if (dst == NULL || src == NULL)  {
2719                 printf("ip6_clearpktopts: invalid argument\n");
2720                 return (EINVAL);
2721         }
2722
2723         dst->ip6po_hlim = src->ip6po_hlim;
2724         dst->ip6po_tclass = src->ip6po_tclass;
2725         dst->ip6po_flags = src->ip6po_flags;
2726         dst->ip6po_minmtu = src->ip6po_minmtu;
2727         dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2728         if (src->ip6po_pktinfo) {
2729                 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2730                     M_IP6OPT, canwait);
2731                 if (dst->ip6po_pktinfo == NULL)
2732                         goto bad;
2733                 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2734         }
2735         if (src->ip6po_nexthop) {
2736                 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2737                     M_IP6OPT, canwait);
2738                 if (dst->ip6po_nexthop == NULL)
2739                         goto bad;
2740                 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2741                     src->ip6po_nexthop->sa_len);
2742         }
2743         PKTOPT_EXTHDRCPY(ip6po_hbh);
2744         PKTOPT_EXTHDRCPY(ip6po_dest1);
2745         PKTOPT_EXTHDRCPY(ip6po_dest2);
2746         PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2747         dst->ip6po_valid = src->ip6po_valid;
2748         return (0);
2749
2750   bad:
2751         ip6_clearpktopts(dst, -1);
2752         return (ENOBUFS);
2753 }
2754 #undef PKTOPT_EXTHDRCPY
2755
2756 struct ip6_pktopts *
2757 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2758 {
2759         int error;
2760         struct ip6_pktopts *dst;
2761
2762         dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2763         if (dst == NULL)
2764                 return (NULL);
2765         ip6_initpktopts(dst);
2766
2767         if ((error = copypktopts(dst, src, canwait)) != 0) {
2768                 free(dst, M_IP6OPT);
2769                 return (NULL);
2770         }
2771
2772         return (dst);
2773 }
2774
2775 void
2776 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2777 {
2778         if (pktopt == NULL)
2779                 return;
2780
2781         ip6_clearpktopts(pktopt, -1);
2782
2783         free(pktopt, M_IP6OPT);
2784 }
2785
2786 /*
2787  * Set IPv6 outgoing packet options based on advanced API.
2788  */
2789 int
2790 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2791     struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2792 {
2793         struct cmsghdr *cm = NULL;
2794
2795         if (control == NULL || opt == NULL)
2796                 return (EINVAL);
2797
2798         /*
2799          * ip6_setpktopt can call ifnet_byindex(), so it's imperative that we
2800          * are in the network epoch here.
2801          */
2802         NET_EPOCH_ASSERT();
2803
2804         ip6_initpktopts(opt);
2805         if (stickyopt) {
2806                 int error;
2807
2808                 /*
2809                  * If stickyopt is provided, make a local copy of the options
2810                  * for this particular packet, then override them by ancillary
2811                  * objects.
2812                  * XXX: copypktopts() does not copy the cached route to a next
2813                  * hop (if any).  This is not very good in terms of efficiency,
2814                  * but we can allow this since this option should be rarely
2815                  * used.
2816                  */
2817                 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2818                         return (error);
2819         }
2820
2821         /*
2822          * XXX: Currently, we assume all the optional information is stored
2823          * in a single mbuf.
2824          */
2825         if (control->m_next)
2826                 return (EINVAL);
2827
2828         for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2829             control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2830                 int error;
2831
2832                 if (control->m_len < CMSG_LEN(0))
2833                         return (EINVAL);
2834
2835                 cm = mtod(control, struct cmsghdr *);
2836                 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2837                         return (EINVAL);
2838                 if (cm->cmsg_level != IPPROTO_IPV6)
2839                         continue;
2840
2841                 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2842                     cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2843                 if (error)
2844                         return (error);
2845         }
2846
2847         return (0);
2848 }
2849
2850 /*
2851  * Set a particular packet option, as a sticky option or an ancillary data
2852  * item.  "len" can be 0 only when it's a sticky option.
2853  * We have 4 cases of combination of "sticky" and "cmsg":
2854  * "sticky=0, cmsg=0": impossible
2855  * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2856  * "sticky=1, cmsg=0": RFC3542 socket option
2857  * "sticky=1, cmsg=1": RFC2292 socket option
2858  */
2859 static int
2860 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2861     struct ucred *cred, int sticky, int cmsg, int uproto)
2862 {
2863         int minmtupolicy, preftemp;
2864         int error;
2865
2866         NET_EPOCH_ASSERT();
2867
2868         if (!sticky && !cmsg) {
2869 #ifdef DIAGNOSTIC
2870                 printf("ip6_setpktopt: impossible case\n");
2871 #endif
2872                 return (EINVAL);
2873         }
2874
2875         /*
2876          * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2877          * not be specified in the context of RFC3542.  Conversely,
2878          * RFC3542 types should not be specified in the context of RFC2292.
2879          */
2880         if (!cmsg) {
2881                 switch (optname) {
2882                 case IPV6_2292PKTINFO:
2883                 case IPV6_2292HOPLIMIT:
2884                 case IPV6_2292NEXTHOP:
2885                 case IPV6_2292HOPOPTS:
2886                 case IPV6_2292DSTOPTS:
2887                 case IPV6_2292RTHDR:
2888                 case IPV6_2292PKTOPTIONS:
2889                         return (ENOPROTOOPT);
2890                 }
2891         }
2892         if (sticky && cmsg) {
2893                 switch (optname) {
2894                 case IPV6_PKTINFO:
2895                 case IPV6_HOPLIMIT:
2896                 case IPV6_NEXTHOP:
2897                 case IPV6_HOPOPTS:
2898                 case IPV6_DSTOPTS:
2899                 case IPV6_RTHDRDSTOPTS:
2900                 case IPV6_RTHDR:
2901                 case IPV6_USE_MIN_MTU:
2902                 case IPV6_DONTFRAG:
2903                 case IPV6_TCLASS:
2904                 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2905                         return (ENOPROTOOPT);
2906                 }
2907         }
2908
2909         switch (optname) {
2910         case IPV6_2292PKTINFO:
2911         case IPV6_PKTINFO:
2912         {
2913                 struct ifnet *ifp = NULL;
2914                 struct in6_pktinfo *pktinfo;
2915
2916                 if (len != sizeof(struct in6_pktinfo))
2917                         return (EINVAL);
2918
2919                 pktinfo = (struct in6_pktinfo *)buf;
2920
2921                 /*
2922                  * An application can clear any sticky IPV6_PKTINFO option by
2923                  * doing a "regular" setsockopt with ipi6_addr being
2924                  * in6addr_any and ipi6_ifindex being zero.
2925                  * [RFC 3542, Section 6]
2926                  */
2927                 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2928                     pktinfo->ipi6_ifindex == 0 &&
2929                     IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2930                         ip6_clearpktopts(opt, optname);
2931                         break;
2932                 }
2933
2934                 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2935                     sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2936                         return (EINVAL);
2937                 }
2938                 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
2939                         return (EINVAL);
2940                 /* validate the interface index if specified. */
2941                 if (pktinfo->ipi6_ifindex) {
2942                         ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2943                         if (ifp == NULL)
2944                                 return (ENXIO);
2945                 }
2946                 if (ifp != NULL && (ifp->if_afdata[AF_INET6] == NULL ||
2947                     (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) != 0))
2948                         return (ENETDOWN);
2949
2950                 if (ifp != NULL &&
2951                     !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2952                         struct in6_ifaddr *ia;
2953
2954                         in6_setscope(&pktinfo->ipi6_addr, ifp, NULL);
2955                         ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr);
2956                         if (ia == NULL)
2957                                 return (EADDRNOTAVAIL);
2958                         ifa_free(&ia->ia_ifa);
2959                 }
2960                 /*
2961                  * We store the address anyway, and let in6_selectsrc()
2962                  * validate the specified address.  This is because ipi6_addr
2963                  * may not have enough information about its scope zone, and
2964                  * we may need additional information (such as outgoing
2965                  * interface or the scope zone of a destination address) to
2966                  * disambiguate the scope.
2967                  * XXX: the delay of the validation may confuse the
2968                  * application when it is used as a sticky option.
2969                  */
2970                 if (opt->ip6po_pktinfo == NULL) {
2971                         opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2972                             M_IP6OPT, M_NOWAIT);
2973                         if (opt->ip6po_pktinfo == NULL)
2974                                 return (ENOBUFS);
2975                 }
2976                 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2977                 opt->ip6po_valid |= IP6PO_VALID_PKTINFO;
2978                 break;
2979         }
2980
2981         case IPV6_2292HOPLIMIT:
2982         case IPV6_HOPLIMIT:
2983         {
2984                 int *hlimp;
2985
2986                 /*
2987                  * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2988                  * to simplify the ordering among hoplimit options.
2989                  */
2990                 if (optname == IPV6_HOPLIMIT && sticky)
2991                         return (ENOPROTOOPT);
2992
2993                 if (len != sizeof(int))
2994                         return (EINVAL);
2995                 hlimp = (int *)buf;
2996                 if (*hlimp < -1 || *hlimp > 255)
2997                         return (EINVAL);
2998
2999                 opt->ip6po_hlim = *hlimp;
3000                 opt->ip6po_valid |= IP6PO_VALID_HLIM;
3001                 break;
3002         }
3003
3004         case IPV6_TCLASS:
3005         {
3006                 int tclass;
3007
3008                 if (len != sizeof(int))
3009                         return (EINVAL);
3010                 tclass = *(int *)buf;
3011                 if (tclass < -1 || tclass > 255)
3012                         return (EINVAL);
3013
3014                 opt->ip6po_tclass = tclass;
3015                 opt->ip6po_valid |= IP6PO_VALID_TC;
3016                 break;
3017         }
3018
3019         case IPV6_2292NEXTHOP:
3020         case IPV6_NEXTHOP:
3021                 if (cred != NULL) {
3022                         error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
3023                         if (error)
3024                                 return (error);
3025                 }
3026
3027                 if (len == 0) { /* just remove the option */
3028                         ip6_clearpktopts(opt, IPV6_NEXTHOP);
3029                         break;
3030                 }
3031
3032                 /* check if cmsg_len is large enough for sa_len */
3033                 if (len < sizeof(struct sockaddr) || len < *buf)
3034                         return (EINVAL);
3035
3036                 switch (((struct sockaddr *)buf)->sa_family) {
3037                 case AF_INET6:
3038                 {
3039                         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
3040                         int error;
3041
3042                         if (sa6->sin6_len != sizeof(struct sockaddr_in6))
3043                                 return (EINVAL);
3044
3045                         if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
3046                             IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
3047                                 return (EINVAL);
3048                         }
3049                         if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
3050                             != 0) {
3051                                 return (error);
3052                         }
3053                         break;
3054                 }
3055                 case AF_LINK:   /* should eventually be supported */
3056                 default:
3057                         return (EAFNOSUPPORT);
3058                 }
3059
3060                 /* turn off the previous option, then set the new option. */
3061                 ip6_clearpktopts(opt, IPV6_NEXTHOP);
3062                 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
3063                 if (opt->ip6po_nexthop == NULL)
3064                         return (ENOBUFS);
3065                 bcopy(buf, opt->ip6po_nexthop, *buf);
3066                 opt->ip6po_valid |= IP6PO_VALID_NHINFO;
3067                 break;
3068
3069         case IPV6_2292HOPOPTS:
3070         case IPV6_HOPOPTS:
3071         {
3072                 struct ip6_hbh *hbh;
3073                 int hbhlen;
3074
3075                 /*
3076                  * XXX: We don't allow a non-privileged user to set ANY HbH
3077                  * options, since per-option restriction has too much
3078                  * overhead.
3079                  */
3080                 if (cred != NULL) {
3081                         error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
3082                         if (error)
3083                                 return (error);
3084                 }
3085
3086                 if (len == 0) {
3087                         ip6_clearpktopts(opt, IPV6_HOPOPTS);
3088                         break;  /* just remove the option */
3089                 }
3090
3091                 /* message length validation */
3092                 if (len < sizeof(struct ip6_hbh))
3093                         return (EINVAL);
3094                 hbh = (struct ip6_hbh *)buf;
3095                 hbhlen = (hbh->ip6h_len + 1) << 3;
3096                 if (len != hbhlen)
3097                         return (EINVAL);
3098
3099                 /* turn off the previous option, then set the new option. */
3100                 ip6_clearpktopts(opt, IPV6_HOPOPTS);
3101                 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
3102                 if (opt->ip6po_hbh == NULL)
3103                         return (ENOBUFS);
3104                 bcopy(hbh, opt->ip6po_hbh, hbhlen);
3105                 opt->ip6po_valid |= IP6PO_VALID_HBH;
3106
3107                 break;
3108         }
3109
3110         case IPV6_2292DSTOPTS:
3111         case IPV6_DSTOPTS:
3112         case IPV6_RTHDRDSTOPTS:
3113         {
3114                 struct ip6_dest *dest, **newdest = NULL;
3115                 int destlen;
3116
3117                 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
3118                         error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
3119                         if (error)
3120                                 return (error);
3121                 }
3122
3123                 if (len == 0) {
3124                         ip6_clearpktopts(opt, optname);
3125                         break;  /* just remove the option */
3126                 }
3127
3128                 /* message length validation */
3129                 if (len < sizeof(struct ip6_dest))
3130                         return (EINVAL);
3131                 dest = (struct ip6_dest *)buf;
3132                 destlen = (dest->ip6d_len + 1) << 3;
3133                 if (len != destlen)
3134                         return (EINVAL);
3135
3136                 /*
3137                  * Determine the position that the destination options header
3138                  * should be inserted; before or after the routing header.
3139                  */
3140                 switch (optname) {
3141                 case IPV6_2292DSTOPTS:
3142                         /*
3143                          * The old advacned API is ambiguous on this point.
3144                          * Our approach is to determine the position based
3145                          * according to the existence of a routing header.
3146                          * Note, however, that this depends on the order of the
3147                          * extension headers in the ancillary data; the 1st
3148                          * part of the destination options header must appear
3149                          * before the routing header in the ancillary data,
3150                          * too.
3151                          * RFC3542 solved the ambiguity by introducing
3152                          * separate ancillary data or option types.
3153                          */
3154                         if (opt->ip6po_rthdr == NULL)
3155                                 newdest = &opt->ip6po_dest1;
3156                         else
3157                                 newdest = &opt->ip6po_dest2;
3158                         break;
3159                 case IPV6_RTHDRDSTOPTS:
3160                         newdest = &opt->ip6po_dest1;
3161                         break;
3162                 case IPV6_DSTOPTS:
3163                         newdest = &opt->ip6po_dest2;
3164                         break;
3165                 }
3166
3167                 /* turn off the previous option, then set the new option. */
3168                 ip6_clearpktopts(opt, optname);
3169                 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
3170                 if (*newdest == NULL)
3171                         return (ENOBUFS);
3172                 bcopy(dest, *newdest, destlen);
3173                 if (newdest == &opt->ip6po_dest1)
3174                         opt->ip6po_valid |= IP6PO_VALID_DEST1;
3175                 else
3176                         opt->ip6po_valid |= IP6PO_VALID_DEST2;
3177
3178                 break;
3179         }
3180
3181         case IPV6_2292RTHDR:
3182         case IPV6_RTHDR:
3183         {
3184                 struct ip6_rthdr *rth;
3185                 int rthlen;
3186
3187                 if (len == 0) {
3188                         ip6_clearpktopts(opt, IPV6_RTHDR);
3189                         break;  /* just remove the option */
3190                 }
3191
3192                 /* message length validation */
3193                 if (len < sizeof(struct ip6_rthdr))
3194                         return (EINVAL);
3195                 rth = (struct ip6_rthdr *)buf;
3196                 rthlen = (rth->ip6r_len + 1) << 3;
3197                 if (len != rthlen)
3198                         return (EINVAL);
3199
3200                 switch (rth->ip6r_type) {
3201                 case IPV6_RTHDR_TYPE_0:
3202                         if (rth->ip6r_len == 0) /* must contain one addr */
3203                                 return (EINVAL);
3204                         if (rth->ip6r_len % 2) /* length must be even */
3205                                 return (EINVAL);
3206                         if (rth->ip6r_len / 2 != rth->ip6r_segleft)
3207                                 return (EINVAL);
3208                         break;
3209                 default:
3210                         return (EINVAL);        /* not supported */
3211                 }
3212
3213                 /* turn off the previous option */
3214                 ip6_clearpktopts(opt, IPV6_RTHDR);
3215                 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
3216                 if (opt->ip6po_rthdr == NULL)
3217                         return (ENOBUFS);
3218                 bcopy(rth, opt->ip6po_rthdr, rthlen);
3219                 opt->ip6po_valid |= IP6PO_VALID_RHINFO;
3220
3221                 break;
3222         }
3223
3224         case IPV6_USE_MIN_MTU:
3225                 if (len != sizeof(int))
3226                         return (EINVAL);
3227                 minmtupolicy = *(int *)buf;
3228                 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
3229                     minmtupolicy != IP6PO_MINMTU_DISABLE &&
3230                     minmtupolicy != IP6PO_MINMTU_ALL) {
3231                         return (EINVAL);
3232                 }
3233                 opt->ip6po_minmtu = minmtupolicy;
3234                 break;
3235
3236         case IPV6_DONTFRAG:
3237                 if (len != sizeof(int))
3238                         return (EINVAL);
3239
3240                 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
3241                         /*
3242                          * we ignore this option for TCP sockets.
3243                          * (RFC3542 leaves this case unspecified.)
3244                          */
3245                         opt->ip6po_flags &= ~IP6PO_DONTFRAG;
3246                 } else
3247                         opt->ip6po_flags |= IP6PO_DONTFRAG;
3248                 break;
3249
3250         case IPV6_PREFER_TEMPADDR:
3251                 if (len != sizeof(int))
3252                         return (EINVAL);
3253                 preftemp = *(int *)buf;
3254                 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
3255                     preftemp != IP6PO_TEMPADDR_NOTPREFER &&
3256                     preftemp != IP6PO_TEMPADDR_PREFER) {
3257                         return (EINVAL);
3258                 }
3259                 opt->ip6po_prefer_tempaddr = preftemp;
3260                 break;
3261
3262         default:
3263                 return (ENOPROTOOPT);
3264         } /* end of switch */
3265
3266         return (0);
3267 }
3268
3269 /*
3270  * Routine called from ip6_output() to loop back a copy of an IP6 multicast
3271  * packet to the input queue of a specified interface.  Note that this
3272  * calls the output routine of the loopback "driver", but with an interface
3273  * pointer that might NOT be &loif -- easier than replicating that code here.
3274  */
3275 void
3276 ip6_mloopback(struct ifnet *ifp, struct mbuf *m)
3277 {
3278         struct mbuf *copym;
3279         struct ip6_hdr *ip6;
3280
3281         copym = m_copym(m, 0, M_COPYALL, M_NOWAIT);
3282         if (copym == NULL)
3283                 return;
3284
3285         /*
3286          * Make sure to deep-copy IPv6 header portion in case the data
3287          * is in an mbuf cluster, so that we can safely override the IPv6
3288          * header portion later.
3289          */
3290         if (!M_WRITABLE(copym) ||
3291             copym->m_len < sizeof(struct ip6_hdr)) {
3292                 copym = m_pullup(copym, sizeof(struct ip6_hdr));
3293                 if (copym == NULL)
3294                         return;
3295         }
3296         ip6 = mtod(copym, struct ip6_hdr *);
3297         /*
3298          * clear embedded scope identifiers if necessary.
3299          * in6_clearscope will touch the addresses only when necessary.
3300          */
3301         in6_clearscope(&ip6->ip6_src);
3302         in6_clearscope(&ip6->ip6_dst);
3303         if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
3304                 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 |
3305                     CSUM_PSEUDO_HDR;
3306                 copym->m_pkthdr.csum_data = 0xffff;
3307         }
3308         if_simloop(ifp, copym, AF_INET6, 0);
3309 }
3310
3311 /*
3312  * Chop IPv6 header off from the payload.
3313  */
3314 static int
3315 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
3316 {
3317         struct mbuf *mh;
3318         struct ip6_hdr *ip6;
3319
3320         ip6 = mtod(m, struct ip6_hdr *);
3321         if (m->m_len > sizeof(*ip6)) {
3322                 mh = m_gethdr(M_NOWAIT, MT_DATA);
3323                 if (mh == NULL) {
3324                         m_freem(m);
3325                         return ENOBUFS;
3326                 }
3327                 m_move_pkthdr(mh, m);
3328                 M_ALIGN(mh, sizeof(*ip6));
3329                 m->m_len -= sizeof(*ip6);
3330                 m->m_data += sizeof(*ip6);
3331                 mh->m_next = m;
3332                 m = mh;
3333                 m->m_len = sizeof(*ip6);
3334                 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
3335         }
3336         exthdrs->ip6e_ip6 = m;
3337         return 0;
3338 }
3339
3340 /*
3341  * Compute IPv6 extension header length.
3342  */
3343 int
3344 ip6_optlen(struct inpcb *inp)
3345 {
3346         int len;
3347
3348         if (!inp->in6p_outputopts)
3349                 return 0;
3350
3351         len = 0;
3352 #define elen(x) \
3353     (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3354
3355         len += elen(inp->in6p_outputopts->ip6po_hbh);
3356         if (inp->in6p_outputopts->ip6po_rthdr)
3357                 /* dest1 is valid with rthdr only */
3358                 len += elen(inp->in6p_outputopts->ip6po_dest1);
3359         len += elen(inp->in6p_outputopts->ip6po_rthdr);
3360         len += elen(inp->in6p_outputopts->ip6po_dest2);
3361         return len;
3362 #undef elen
3363 }