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  *      @(#)ip_output.c 8.3 (Berkeley) 1/21/94
  63  */
  64
  65 #include <sys/cdefs.h>
  66 __FBSDID("$FreeBSD$");
  67
  68 #include "opt_inet.h"
  69 #include "opt_inet6.h"
  70 #include "opt_ipsec.h"
  71 #include "opt_kern_tls.h"
  72 #include "opt_ratelimit.h"
  73 #include "opt_route.h"
  74 #include "opt_rss.h"
  75 #include "opt_sctp.h"
  76
  77 #include <sys/param.h>
  78 #include <sys/kernel.h>
  79 #include <sys/ktls.h>
  80 #include <sys/malloc.h>
  81 #include <sys/mbuf.h>
  82 #include <sys/errno.h>
  83 #include <sys/priv.h>
  84 #include <sys/proc.h>
  85 #include <sys/protosw.h>
  86 #include <sys/socket.h>
  87 #include <sys/socketvar.h>
  88 #include <sys/syslog.h>
  89 #include <sys/ucred.h>
  90
  91 #include <machine/in_cksum.h>
  92
  93 #include <net/if.h>
  94 #include <net/if_var.h>
  95 #include <net/if_vlan_var.h>
  96 #include <net/if_llatbl.h>
  97 #include <net/ethernet.h>
  98 #include <net/netisr.h>
  99 #include <net/route.h>
 100 #include <net/route/nhop.h>
 101 #include <net/pfil.h>
 102 #include <net/rss_config.h>
 103 #include <net/vnet.h>
 104
 105 #include <netinet/in.h>
 106 #include <netinet/in_var.h>
 107 #include <netinet/ip_var.h>
 108 #include <netinet6/in6_fib.h>
 109 #include <netinet6/in6_var.h>
 110 #include <netinet/ip6.h>
 111 #include <netinet/icmp6.h>
 112 #include <netinet6/ip6_var.h>
 113 #include <netinet/in_pcb.h>
 114 #include <netinet/tcp_var.h>
 115 #include <netinet6/nd6.h>
 116 #include <netinet6/in6_rss.h>
 117
 118 #include <netipsec/ipsec_support.h>
 119 #if defined(SCTP) || defined(SCTP_SUPPORT)
 120 #include <netinet/sctp.h>
 121 #include <netinet/sctp_crc32.h>
 122 #endif
 123
 124 #include <netinet6/ip6protosw.h>
 125 #include <netinet6/scope6_var.h>
 126
 127 extern int in6_mcast_loop;
 128
 129 struct ip6_exthdrs {
 130         struct mbuf *ip6e_ip6;
 131         struct mbuf *ip6e_hbh;
 132         struct mbuf *ip6e_dest1;
 133         struct mbuf *ip6e_rthdr;
 134         struct mbuf *ip6e_dest2;
 135 };
 136
 137 static MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
 138
 139 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
 140                            struct ucred *, int);
 141 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
 142         struct socket *, struct sockopt *);
 143 static int ip6_getpcbopt(struct inpcb *, int, struct sockopt *);
 144 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
 145         struct ucred *, int, int, int);
 146
 147 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
 148 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
 149         struct ip6_frag **);
 150 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
 151 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
 152 static int ip6_getpmtu(struct route_in6 *, int,
 153         struct ifnet *, const struct in6_addr *, u_long *, int *, u_int,
 154         u_int);
 155 static int ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long,
 156         u_long *, int *, u_int);
 157 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *);
 158 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
 159
 160 /*
 161  * Make an extension header from option data.  hp is the source,
 162  * mp is the destination, and _ol is the optlen.
 163  */
 164 #define MAKE_EXTHDR(hp, mp, _ol)                                        \
 165     do {                                                                \
 166         if (hp) {                                                       \
 167                 struct ip6_ext *eh = (struct ip6_ext *)(hp);            \
 168                 error = ip6_copyexthdr((mp), (caddr_t)(hp),             \
 169                     ((eh)->ip6e_len + 1) << 3);                         \
 170                 if (error)                                              \
 171                         goto freehdrs;                                  \
 172                 (_ol) += (*(mp))->m_len;                                \
 173         }                                                               \
 174     } while (/*CONSTCOND*/ 0)
 175
 176 /*
 177  * Form a chain of extension headers.
 178  * m is the extension header mbuf
 179  * mp is the previous mbuf in the chain
 180  * p is the next header
 181  * i is the type of option.
 182  */
 183 #define MAKE_CHAIN(m, mp, p, i)\
 184     do {\
 185         if (m) {\
 186                 if (!hdrsplit) \
 187                         panic("%s:%d: assumption failed: "\
 188                             "hdr not split: hdrsplit %d exthdrs %p",\
 189                             __func__, __LINE__, hdrsplit, &exthdrs);\
 190                 *mtod((m), u_char *) = *(p);\
 191                 *(p) = (i);\
 192                 p = mtod((m), u_char *);\
 193                 (m)->m_next = (mp)->m_next;\
 194                 (mp)->m_next = (m);\
 195                 (mp) = (m);\
 196         }\
 197     } while (/*CONSTCOND*/ 0)
 198
 199 void
 200 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
 201 {
 202         u_short csum;
 203
 204         csum = in_cksum_skip(m, offset + plen, offset);
 205         if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
 206                 csum = 0xffff;
 207         offset += m->m_pkthdr.csum_data;        /* checksum offset */
 208
 209         if (offset + sizeof(csum) > m->m_len)
 210                 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
 211         else
 212                 *(u_short *)mtodo(m, offset) = csum;
 213 }
 214
 215 static int
 216 ip6_output_delayed_csum(struct mbuf *m, struct ifnet *ifp, int csum_flags,
 217     int plen, int optlen, bool frag)
 218 {
 219
 220         KASSERT((plen >= optlen), ("%s:%d: plen %d < optlen %d, m %p, ifp %p "
 221             "csum_flags %#x frag %d\n",
 222             __func__, __LINE__, plen, optlen, m, ifp, csum_flags, frag));
 223
 224         if ((csum_flags & CSUM_DELAY_DATA_IPV6) ||
 225 #if defined(SCTP) || defined(SCTP_SUPPORT)
 226             (csum_flags & CSUM_SCTP_IPV6) ||
 227 #endif
 228             (!frag && (ifp->if_capenable & IFCAP_NOMAP) == 0)) {
 229                 m = mb_unmapped_to_ext(m);
 230                 if (m == NULL) {
 231                         if (frag)
 232                                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
 233                         else
 234                                 IP6STAT_INC(ip6s_odropped);
 235                         return (ENOBUFS);
 236                 }
 237                 if (csum_flags & CSUM_DELAY_DATA_IPV6) {
 238                         in6_delayed_cksum(m, plen - optlen,
 239                             sizeof(struct ip6_hdr) + optlen);
 240                         m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
 241                 }
 242 #if defined(SCTP) || defined(SCTP_SUPPORT)
 243                 if (csum_flags & CSUM_SCTP_IPV6) {
 244                         sctp_delayed_cksum(m, sizeof(struct ip6_hdr) + optlen);
 245                         m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
 246                 }
 247 #endif
 248         }
 249
 250         return (0);
 251 }
 252
 253 int
 254 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto,
 255     int fraglen , uint32_t id)
 256 {
 257         struct mbuf *m, **mnext, *m_frgpart;
 258         struct ip6_hdr *ip6, *mhip6;
 259         struct ip6_frag *ip6f;
 260         int off;
 261         int error;
 262         int tlen = m0->m_pkthdr.len;
 263
 264         KASSERT((fraglen % 8 == 0), ("Fragment length must be a multiple of 8"));
 265
 266         m = m0;
 267         ip6 = mtod(m, struct ip6_hdr *);
 268         mnext = &m->m_nextpkt;
 269
 270         for (off = hlen; off < tlen; off += fraglen) {
 271                 m = m_gethdr(M_NOWAIT, MT_DATA);
 272                 if (!m) {
 273                         IP6STAT_INC(ip6s_odropped);
 274                         return (ENOBUFS);
 275                 }
 276
 277                 /*
 278                  * Make sure the complete packet header gets copied
 279                  * from the originating mbuf to the newly created
 280                  * mbuf. This also ensures that existing firewall
 281                  * classification(s), VLAN tags and so on get copied
 282                  * to the resulting fragmented packet(s):
 283                  */
 284                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
 285                         m_free(m);
 286                         IP6STAT_INC(ip6s_odropped);
 287                         return (ENOBUFS);
 288                 }
 289
 290                 *mnext = m;
 291                 mnext = &m->m_nextpkt;
 292                 m->m_data += max_linkhdr;
 293                 mhip6 = mtod(m, struct ip6_hdr *);
 294                 *mhip6 = *ip6;
 295                 m->m_len = sizeof(*mhip6);
 296                 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
 297                 if (error) {
 298                         IP6STAT_INC(ip6s_odropped);
 299                         return (error);
 300                 }
 301                 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
 302                 if (off + fraglen >= tlen)
 303                         fraglen = tlen - off;
 304                 else
 305                         ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
 306                 mhip6->ip6_plen = htons((u_short)(fraglen + hlen +
 307                     sizeof(*ip6f) - sizeof(struct ip6_hdr)));
 308                 if ((m_frgpart = m_copym(m0, off, fraglen, M_NOWAIT)) == NULL) {
 309                         IP6STAT_INC(ip6s_odropped);
 310                         return (ENOBUFS);
 311                 }
 312                 m_cat(m, m_frgpart);
 313                 m->m_pkthdr.len = fraglen + hlen + sizeof(*ip6f);
 314                 ip6f->ip6f_reserved = 0;
 315                 ip6f->ip6f_ident = id;
 316                 ip6f->ip6f_nxt = nextproto;
 317                 IP6STAT_INC(ip6s_ofragments);
 318                 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
 319         }
 320
 321         return (0);
 322 }
 323
 324 static int
 325 ip6_output_send(struct inpcb *inp, struct ifnet *ifp, struct ifnet *origifp,
 326     struct mbuf *m, struct sockaddr_in6 *dst, struct route_in6 *ro,
 327     bool stamp_tag)
 328 {
 329 #ifdef KERN_TLS
 330         struct ktls_session *tls = NULL;
 331 #endif
 332         struct m_snd_tag *mst;
 333         int error;
 334
 335         MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
 336         mst = NULL;
 337
 338 #ifdef KERN_TLS
 339         /*
 340          * If this is an unencrypted TLS record, save a reference to
 341          * the record.  This local reference is used to call
 342          * ktls_output_eagain after the mbuf has been freed (thus
 343          * dropping the mbuf's reference) in if_output.
 344          */
 345         if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) {
 346                 tls = ktls_hold(m->m_next->m_epg_tls);
 347                 mst = tls->snd_tag;
 348
 349                 /*
 350                  * If a TLS session doesn't have a valid tag, it must
 351                  * have had an earlier ifp mismatch, so drop this
 352                  * packet.
 353                  */
 354                 if (mst == NULL) {
 355                         error = EAGAIN;
 356                         goto done;
 357                 }
 358                 /*
 359                  * Always stamp tags that include NIC ktls.
 360                  */
 361                 stamp_tag = true;
 362         }
 363 #endif
 364 #ifdef RATELIMIT
 365         if (inp != NULL && mst == NULL) {
 366                 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 ||
 367                     (inp->inp_snd_tag != NULL &&
 368                     inp->inp_snd_tag->ifp != ifp))
 369                         in_pcboutput_txrtlmt(inp, ifp, m);
 370
 371                 if (inp->inp_snd_tag != NULL)
 372                         mst = inp->inp_snd_tag;
 373         }
 374 #endif
 375         if (stamp_tag && mst != NULL) {
 376                 KASSERT(m->m_pkthdr.rcvif == NULL,
 377                     ("trying to add a send tag to a forwarded packet"));
 378                 if (mst->ifp != ifp) {
 379                         error = EAGAIN;
 380                         goto done;
 381                 }
 382
 383                 /* stamp send tag on mbuf */
 384                 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst);
 385                 m->m_pkthdr.csum_flags |= CSUM_SND_TAG;
 386         }
 387
 388         error = nd6_output_ifp(ifp, origifp, m, dst, (struct route *)ro);
 389
 390 done:
 391         /* Check for route change invalidating send tags. */
 392 #ifdef KERN_TLS
 393         if (tls != NULL) {
 394                 if (error == EAGAIN)
 395                         error = ktls_output_eagain(inp, tls);
 396                 ktls_free(tls);
 397         }
 398 #endif
 399 #ifdef RATELIMIT
 400         if (error == EAGAIN)
 401                 in_pcboutput_eagain(inp);
 402 #endif
 403         return (error);
 404 }
 405
 406 /*
 407  * IP6 output.
 408  * The packet in mbuf chain m contains a skeletal IP6 header (with pri, len,
 409  * nxt, hlim, src, dst).
 410  * This function may modify ver and hlim only.
 411  * The mbuf chain containing the packet will be freed.
 412  * The mbuf opt, if present, will not be freed.
 413  * If route_in6 ro is present and has ro_nh initialized, route lookup would be
 414  * skipped and ro->ro_nh would be used. If ro is present but ro->ro_nh is NULL,
 415  * then result of route lookup is stored in ro->ro_nh.
 416  *
 417  * Type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and nd_ifinfo.linkmtu
 418  * is uint32_t.  So we use u_long to hold largest one, which is rt_mtu.
 419  *
 420  * ifpp - XXX: just for statistics
 421  */
 422 int
 423 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
 424     struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
 425     struct ifnet **ifpp, struct inpcb *inp)
 426 {
 427         struct ip6_hdr *ip6;
 428         struct ifnet *ifp, *origifp;
 429         struct mbuf *m = m0;
 430         struct mbuf *mprev;
 431         struct route_in6 *ro_pmtu;
 432         struct nhop_object *nh;
 433         struct sockaddr_in6 *dst, sin6, src_sa, dst_sa;
 434         struct in6_addr odst;
 435         u_char *nexthdrp;
 436         int tlen, len;
 437         int error = 0;
 438         int vlan_pcp = -1;
 439         struct in6_ifaddr *ia = NULL;
 440         u_long mtu;
 441         int alwaysfrag, dontfrag;
 442         u_int32_t optlen, plen = 0, unfragpartlen;
 443         struct ip6_exthdrs exthdrs;
 444         struct in6_addr src0, dst0;
 445         u_int32_t zone;
 446         bool hdrsplit;
 447         int sw_csum, tso;
 448         int needfiblookup;
 449         uint32_t fibnum;
 450         struct m_tag *fwd_tag = NULL;
 451         uint32_t id;
 452
 453         NET_EPOCH_ASSERT();
 454
 455         if (inp != NULL) {
 456                 INP_LOCK_ASSERT(inp);
 457                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 458                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 459                         /* Unconditionally set flowid. */
 460                         m->m_pkthdr.flowid = inp->inp_flowid;
 461                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 462                 }
 463                 if ((inp->inp_flags2 & INP_2PCP_SET) != 0)
 464                         vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >>
 465                             INP_2PCP_SHIFT;
 466 #ifdef NUMA
 467                 m->m_pkthdr.numa_domain = inp->inp_numa_domain;
 468 #endif
 469         }
 470
 471 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 472         /*
 473          * IPSec checking which handles several cases.
 474          * FAST IPSEC: We re-injected the packet.
 475          * XXX: need scope argument.
 476          */
 477         if (IPSEC_ENABLED(ipv6)) {
 478                 if ((error = IPSEC_OUTPUT(ipv6, m, inp)) != 0) {
 479                         if (error == EINPROGRESS)
 480                                 error = 0;
 481                         goto done;
 482                 }
 483         }
 484 #endif /* IPSEC */
 485
 486         /* Source address validation. */
 487         ip6 = mtod(m, struct ip6_hdr *);
 488         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
 489             (flags & IPV6_UNSPECSRC) == 0) {
 490                 error = EOPNOTSUPP;
 491                 IP6STAT_INC(ip6s_badscope);
 492                 goto bad;
 493         }
 494         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
 495                 error = EOPNOTSUPP;
 496                 IP6STAT_INC(ip6s_badscope);
 497                 goto bad;
 498         }
 499
 500         /*
 501          * If we are given packet options to add extension headers prepare them.
 502          * Calculate the total length of the extension header chain.
 503          * Keep the length of the unfragmentable part for fragmentation.
 504          */
 505         bzero(&exthdrs, sizeof(exthdrs));
 506         optlen = 0;
 507         unfragpartlen = sizeof(struct ip6_hdr);
 508         if (opt) {
 509                 /* Hop-by-Hop options header. */
 510                 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh, optlen);
 511
 512                 /* Destination options header (1st part). */
 513                 if (opt->ip6po_rthdr) {
 514 #ifndef RTHDR_SUPPORT_IMPLEMENTED
 515                         /*
 516                          * If there is a routing header, discard the packet
 517                          * right away here. RH0/1 are obsolete and we do not
 518                          * currently support RH2/3/4.
 519                          * People trying to use RH253/254 may want to disable
 520                          * this check.
 521                          * The moment we do support any routing header (again)
 522                          * this block should check the routing type more
 523                          * selectively.
 524                          */
 525                         error = EINVAL;
 526                         goto bad;
 527 #endif
 528
 529                         /*
 530                          * Destination options header (1st part).
 531                          * This only makes sense with a routing header.
 532                          * See Section 9.2 of RFC 3542.
 533                          * Disabling this part just for MIP6 convenience is
 534                          * a bad idea.  We need to think carefully about a
 535                          * way to make the advanced API coexist with MIP6
 536                          * options, which might automatically be inserted in
 537                          * the kernel.
 538                          */
 539                         MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1,
 540                             optlen);
 541                 }
 542                 /* Routing header. */
 543                 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr, optlen);
 544
 545                 unfragpartlen += optlen;
 546
 547                 /*
 548                  * NOTE: we don't add AH/ESP length here (done in
 549                  * ip6_ipsec_output()).
 550                  */
 551
 552                 /* Destination options header (2nd part). */
 553                 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2, optlen);
 554         }
 555
 556         /*
 557          * If there is at least one extension header,
 558          * separate IP6 header from the payload.
 559          */
 560         hdrsplit = false;
 561         if (optlen) {
 562                 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
 563                         m = NULL;
 564                         goto freehdrs;
 565                 }
 566                 m = exthdrs.ip6e_ip6;
 567                 ip6 = mtod(m, struct ip6_hdr *);
 568                 hdrsplit = true;
 569         }
 570
 571         /* Adjust mbuf packet header length. */
 572         m->m_pkthdr.len += optlen;
 573         plen = m->m_pkthdr.len - sizeof(*ip6);
 574
 575         /* If this is a jumbo payload, insert a jumbo payload option. */
 576         if (plen > IPV6_MAXPACKET) {
 577                 if (!hdrsplit) {
 578                         if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
 579                                 m = NULL;
 580                                 goto freehdrs;
 581                         }
 582                         m = exthdrs.ip6e_ip6;
 583                         ip6 = mtod(m, struct ip6_hdr *);
 584                         hdrsplit = true;
 585                 }
 586                 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
 587                         goto freehdrs;
 588                 ip6->ip6_plen = 0;
 589         } else
 590                 ip6->ip6_plen = htons(plen);
 591         nexthdrp = &ip6->ip6_nxt;
 592
 593         if (optlen) {
 594                 /*
 595                  * Concatenate headers and fill in next header fields.
 596                  * Here we have, on "m"
 597                  *      IPv6 payload
 598                  * and we insert headers accordingly.
 599                  * Finally, we should be getting:
 600                  *      IPv6 hbh dest1 rthdr ah* [esp* dest2 payload].
 601                  *
 602                  * During the header composing process "m" points to IPv6
 603                  * header.  "mprev" points to an extension header prior to esp.
 604                  */
 605                 mprev = m;
 606
 607                 /*
 608                  * We treat dest2 specially.  This makes IPsec processing
 609                  * much easier.  The goal here is to make mprev point the
 610                  * mbuf prior to dest2.
 611                  *
 612                  * Result: IPv6 dest2 payload.
 613                  * m and mprev will point to IPv6 header.
 614                  */
 615                 if (exthdrs.ip6e_dest2) {
 616                         if (!hdrsplit)
 617                                 panic("%s:%d: assumption failed: "
 618                                     "hdr not split: hdrsplit %d exthdrs %p",
 619                                     __func__, __LINE__, hdrsplit, &exthdrs);
 620                         exthdrs.ip6e_dest2->m_next = m->m_next;
 621                         m->m_next = exthdrs.ip6e_dest2;
 622                         *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
 623                         ip6->ip6_nxt = IPPROTO_DSTOPTS;
 624                 }
 625
 626                 /*
 627                  * Result: IPv6 hbh dest1 rthdr dest2 payload.
 628                  * m will point to IPv6 header.  mprev will point to the
 629                  * extension header prior to dest2 (rthdr in the above case).
 630                  */
 631                 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
 632                 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
 633                            IPPROTO_DSTOPTS);
 634                 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
 635                            IPPROTO_ROUTING);
 636         }
 637
 638         IP6STAT_INC(ip6s_localout);
 639
 640         /* Route packet. */
 641         ro_pmtu = ro;
 642         if (opt && opt->ip6po_rthdr)
 643                 ro = &opt->ip6po_route;
 644         if (ro != NULL)
 645                 dst = (struct sockaddr_in6 *)&ro->ro_dst;
 646         else
 647                 dst = &sin6;
 648         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 649
 650 again:
 651         /*
 652          * If specified, try to fill in the traffic class field.
 653          * Do not override if a non-zero value is already set.
 654          * We check the diffserv field and the ECN field separately.
 655          */
 656         if (opt && opt->ip6po_tclass >= 0) {
 657                 int mask = 0;
 658
 659                 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
 660                         mask |= 0xfc;
 661                 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
 662                         mask |= 0x03;
 663                 if (mask != 0)
 664                         ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
 665         }
 666
 667         /* Fill in or override the hop limit field, if necessary. */
 668         if (opt && opt->ip6po_hlim != -1)
 669                 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
 670         else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 671                 if (im6o != NULL)
 672                         ip6->ip6_hlim = im6o->im6o_multicast_hlim;
 673                 else
 674                         ip6->ip6_hlim = V_ip6_defmcasthlim;
 675         }
 676
 677         if (ro == NULL || ro->ro_nh == NULL) {
 678                 bzero(dst, sizeof(*dst));
 679                 dst->sin6_family = AF_INET6;
 680                 dst->sin6_len = sizeof(*dst);
 681                 dst->sin6_addr = ip6->ip6_dst;
 682         }
 683         /*
 684          * Validate route against routing table changes.
 685          * Make sure that the address family is set in route.
 686          */
 687         nh = NULL;
 688         ifp = NULL;
 689         mtu = 0;
 690         if (ro != NULL) {
 691                 if (ro->ro_nh != NULL && inp != NULL) {
 692                         ro->ro_dst.sin6_family = AF_INET6; /* XXX KASSERT? */
 693                         NH_VALIDATE((struct route *)ro, &inp->inp_rt_cookie,
 694                             fibnum);
 695                 }
 696                 if (ro->ro_nh != NULL && fwd_tag == NULL &&
 697                     (!NH_IS_VALID(ro->ro_nh) ||
 698                     ro->ro_dst.sin6_family != AF_INET6 ||
 699                     !IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)))
 700                         RO_INVALIDATE_CACHE(ro);
 701
 702                 if (ro->ro_nh != NULL && fwd_tag == NULL &&
 703                     ro->ro_dst.sin6_family == AF_INET6 &&
 704                     IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) {
 705                         nh = ro->ro_nh;
 706                         ifp = nh->nh_ifp;
 707                 } else {
 708                         if (ro->ro_lle)
 709                                 LLE_FREE(ro->ro_lle);   /* zeros ro_lle */
 710                         ro->ro_lle = NULL;
 711                         if (fwd_tag == NULL) {
 712                                 bzero(&dst_sa, sizeof(dst_sa));
 713                                 dst_sa.sin6_family = AF_INET6;
 714                                 dst_sa.sin6_len = sizeof(dst_sa);
 715                                 dst_sa.sin6_addr = ip6->ip6_dst;
 716                         }
 717                         error = in6_selectroute(&dst_sa, opt, im6o, ro, &ifp,
 718                             &nh, fibnum, m->m_pkthdr.flowid);
 719                         if (error != 0) {
 720                                 IP6STAT_INC(ip6s_noroute);
 721                                 if (ifp != NULL)
 722                                         in6_ifstat_inc(ifp, ifs6_out_discard);
 723                                 goto bad;
 724                         }
 725                         if (ifp != NULL)
 726                             mtu = ifp->if_mtu;
 727                 }
 728                 if (nh == NULL) {
 729                         /*
 730                          * If in6_selectroute() does not return a nexthop
 731                          * dst may not have been updated.
 732                          */
 733                         *dst = dst_sa;  /* XXX */
 734                 } else {
 735                         if (nh->nh_flags & NHF_HOST)
 736                             mtu = nh->nh_mtu;
 737                         ia = (struct in6_ifaddr *)(nh->nh_ifa);
 738                         counter_u64_add(nh->nh_pksent, 1);
 739                 }
 740         } else {
 741                 struct nhop_object *nh;
 742                 struct in6_addr kdst;
 743                 uint32_t scopeid;
 744
 745                 if (fwd_tag == NULL) {
 746                         bzero(&dst_sa, sizeof(dst_sa));
 747                         dst_sa.sin6_family = AF_INET6;
 748                         dst_sa.sin6_len = sizeof(dst_sa);
 749                         dst_sa.sin6_addr = ip6->ip6_dst;
 750                 }
 751
 752                 if (IN6_IS_ADDR_MULTICAST(&dst_sa.sin6_addr) &&
 753                     im6o != NULL &&
 754                     (ifp = im6o->im6o_multicast_ifp) != NULL) {
 755                         /* We do not need a route lookup. */
 756                         *dst = dst_sa;  /* XXX */
 757                         goto nonh6lookup;
 758                 }
 759
 760                 in6_splitscope(&dst_sa.sin6_addr, &kdst, &scopeid);
 761
 762                 if (IN6_IS_ADDR_MC_LINKLOCAL(&dst_sa.sin6_addr) ||
 763                     IN6_IS_ADDR_MC_NODELOCAL(&dst_sa.sin6_addr)) {
 764                         if (scopeid > 0) {
 765                                 ifp = in6_getlinkifnet(scopeid);
 766                                 if (ifp == NULL) {
 767                                         error = EHOSTUNREACH;
 768                                         goto bad;
 769                                 }
 770                                 *dst = dst_sa;  /* XXX */
 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                 mtu = nh->nh_mtu;
 786                 ia = ifatoia6(nh->nh_ifa);
 787                 if (nh->nh_flags & NHF_GATEWAY)
 788                         dst->sin6_addr = nh->gw6_sa.sin6_addr;
 789 nonh6lookup:
 790                 ;
 791         }
 792
 793         /* Then nh (for unicast) and ifp must be non-NULL valid values. */
 794         if ((flags & IPV6_FORWARDING) == 0) {
 795                 /* XXX: the FORWARDING flag can be set for mrouting. */
 796                 in6_ifstat_inc(ifp, ifs6_out_request);
 797         }
 798
 799         /* Setup data structures for scope ID checks. */
 800         src0 = ip6->ip6_src;
 801         bzero(&src_sa, sizeof(src_sa));
 802         src_sa.sin6_family = AF_INET6;
 803         src_sa.sin6_len = sizeof(src_sa);
 804         src_sa.sin6_addr = ip6->ip6_src;
 805
 806         dst0 = ip6->ip6_dst;
 807         /* Re-initialize to be sure. */
 808         bzero(&dst_sa, sizeof(dst_sa));
 809         dst_sa.sin6_family = AF_INET6;
 810         dst_sa.sin6_len = sizeof(dst_sa);
 811         dst_sa.sin6_addr = ip6->ip6_dst;
 812
 813         /* Check for valid scope ID. */
 814         if (in6_setscope(&src0, ifp, &zone) == 0 &&
 815             sa6_recoverscope(&src_sa) == 0 && zone == src_sa.sin6_scope_id &&
 816             in6_setscope(&dst0, ifp, &zone) == 0 &&
 817             sa6_recoverscope(&dst_sa) == 0 && zone == dst_sa.sin6_scope_id) {
 818                 /*
 819                  * The outgoing interface is in the zone of the source
 820                  * and destination addresses.
 821                  *
 822                  * Because the loopback interface cannot receive
 823                  * packets with a different scope ID than its own,
 824                  * there is a trick to pretend the outgoing packet
 825                  * was received by the real network interface, by
 826                  * setting "origifp" different from "ifp". This is
 827                  * only allowed when "ifp" is a loopback network
 828                  * interface. Refer to code in nd6_output_ifp() for
 829                  * more details.
 830                  */
 831                 origifp = ifp;
 832
 833                 /*
 834                  * We should use ia_ifp to support the case of sending
 835                  * packets to an address of our own.
 836                  */
 837                 if (ia != NULL && ia->ia_ifp)
 838                         ifp = ia->ia_ifp;
 839
 840         } else if ((ifp->if_flags & IFF_LOOPBACK) == 0 ||
 841             sa6_recoverscope(&src_sa) != 0 ||
 842             sa6_recoverscope(&dst_sa) != 0 ||
 843             dst_sa.sin6_scope_id == 0 ||
 844             (src_sa.sin6_scope_id != 0 &&
 845             src_sa.sin6_scope_id != dst_sa.sin6_scope_id) ||
 846             (origifp = ifnet_byindex(dst_sa.sin6_scope_id)) == NULL) {
 847                 /*
 848                  * If the destination network interface is not a
 849                  * loopback interface, or the destination network
 850                  * address has no scope ID, or the source address has
 851                  * a scope ID set which is different from the
 852                  * destination address one, or there is no network
 853                  * interface representing this scope ID, the address
 854                  * pair is considered invalid.
 855                  */
 856                 IP6STAT_INC(ip6s_badscope);
 857                 in6_ifstat_inc(ifp, ifs6_out_discard);
 858                 if (error == 0)
 859                         error = EHOSTUNREACH; /* XXX */
 860                 goto bad;
 861         }
 862         /* All scope ID checks are successful. */
 863
 864         if (nh && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 865                 if (opt && opt->ip6po_nextroute.ro_nh) {
 866                         /*
 867                          * The nexthop is explicitly specified by the
 868                          * application.  We assume the next hop is an IPv6
 869                          * address.
 870                          */
 871                         dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
 872                 }
 873                 else if ((nh->nh_flags & NHF_GATEWAY))
 874                         dst = &nh->gw6_sa;
 875         }
 876
 877         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 878                 m->m_flags &= ~(M_BCAST | M_MCAST); /* Just in case. */
 879         } else {
 880                 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
 881                 in6_ifstat_inc(ifp, ifs6_out_mcast);
 882
 883                 /* Confirm that the outgoing interface supports multicast. */
 884                 if (!(ifp->if_flags & IFF_MULTICAST)) {
 885                         IP6STAT_INC(ip6s_noroute);
 886                         in6_ifstat_inc(ifp, ifs6_out_discard);
 887                         error = ENETUNREACH;
 888                         goto bad;
 889                 }
 890                 if ((im6o == NULL && in6_mcast_loop) ||
 891                     (im6o && im6o->im6o_multicast_loop)) {
 892                         /*
 893                          * Loop back multicast datagram if not expressly
 894                          * forbidden to do so, even if we have not joined
 895                          * the address; protocols will filter it later,
 896                          * thus deferring a hash lookup and lock acquisition
 897                          * at the expense of an m_copym().
 898                          */
 899                         ip6_mloopback(ifp, m);
 900                 } else {
 901                         /*
 902                          * If we are acting as a multicast router, perform
 903                          * multicast forwarding as if the packet had just
 904                          * arrived on the interface to which we are about
 905                          * to send.  The multicast forwarding function
 906                          * recursively calls this function, using the
 907                          * IPV6_FORWARDING flag to prevent infinite recursion.
 908                          *
 909                          * Multicasts that are looped back by ip6_mloopback(),
 910                          * above, will be forwarded by the ip6_input() routine,
 911                          * if necessary.
 912                          */
 913                         if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
 914                                 /*
 915                                  * XXX: ip6_mforward expects that rcvif is NULL
 916                                  * when it is called from the originating path.
 917                                  * However, it may not always be the case.
 918                                  */
 919                                 m->m_pkthdr.rcvif = NULL;
 920                                 if (ip6_mforward(ip6, ifp, m) != 0) {
 921                                         m_freem(m);
 922                                         goto done;
 923                                 }
 924                         }
 925                 }
 926                 /*
 927                  * Multicasts with a hoplimit of zero may be looped back,
 928                  * above, but must not be transmitted on a network.
 929                  * Also, multicasts addressed to the loopback interface
 930                  * are not sent -- the above call to ip6_mloopback() will
 931                  * loop back a copy if this host actually belongs to the
 932                  * destination group on the loopback interface.
 933                  */
 934                 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
 935                     IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
 936                         m_freem(m);
 937                         goto done;
 938                 }
 939         }
 940
 941         /*
 942          * Fill the outgoing inteface to tell the upper layer
 943          * to increment per-interface statistics.
 944          */
 945         if (ifpp)
 946                 *ifpp = ifp;
 947
 948         /* Determine path MTU. */
 949         if ((error = ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst,
 950                     &mtu, &alwaysfrag, fibnum, *nexthdrp)) != 0)
 951                 goto bad;
 952         KASSERT(mtu > 0, ("%s:%d: mtu %ld, ro_pmtu %p ro %p ifp %p "
 953             "alwaysfrag %d fibnum %u\n", __func__, __LINE__, mtu, ro_pmtu, ro,
 954             ifp, alwaysfrag, fibnum));
 955
 956         /*
 957          * The caller of this function may specify to use the minimum MTU
 958          * in some cases.
 959          * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
 960          * setting.  The logic is a bit complicated; by default, unicast
 961          * packets will follow path MTU while multicast packets will be sent at
 962          * the minimum MTU.  If IP6PO_MINMTU_ALL is specified, all packets
 963          * including unicast ones will be sent at the minimum MTU.  Multicast
 964          * packets will always be sent at the minimum MTU unless
 965          * IP6PO_MINMTU_DISABLE is explicitly specified.
 966          * See RFC 3542 for more details.
 967          */
 968         if (mtu > IPV6_MMTU) {
 969                 if ((flags & IPV6_MINMTU))
 970                         mtu = IPV6_MMTU;
 971                 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
 972                         mtu = IPV6_MMTU;
 973                 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
 974                          (opt == NULL ||
 975                           opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
 976                         mtu = IPV6_MMTU;
 977                 }
 978         }
 979
 980         /*
 981          * Clear embedded scope identifiers if necessary.
 982          * in6_clearscope() will touch the addresses only when necessary.
 983          */
 984         in6_clearscope(&ip6->ip6_src);
 985         in6_clearscope(&ip6->ip6_dst);
 986
 987         /*
 988          * If the outgoing packet contains a hop-by-hop options header,
 989          * it must be examined and processed even by the source node.
 990          * (RFC 2460, section 4.)
 991          */
 992         if (exthdrs.ip6e_hbh) {
 993                 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
 994                 u_int32_t dummy; /* XXX unused */
 995                 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
 996
 997 #ifdef DIAGNOSTIC
 998                 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
 999                         panic("ip6e_hbh is not contiguous");
1000 #endif
1001                 /*
1002                  *  XXX: if we have to send an ICMPv6 error to the sender,
1003                  *       we need the M_LOOP flag since icmp6_error() expects
1004                  *       the IPv6 and the hop-by-hop options header are
1005                  *       contiguous unless the flag is set.
1006                  */
1007                 m->m_flags |= M_LOOP;
1008                 m->m_pkthdr.rcvif = ifp;
1009                 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
1010                     ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
1011                     &dummy, &plen) < 0) {
1012                         /* m was already freed at this point. */
1013                         error = EINVAL;/* better error? */
1014                         goto done;
1015                 }
1016                 m->m_flags &= ~M_LOOP; /* XXX */
1017                 m->m_pkthdr.rcvif = NULL;
1018         }
1019
1020         /* Jump over all PFIL processing if hooks are not active. */
1021         if (!PFIL_HOOKED_OUT(V_inet6_pfil_head))
1022                 goto passout;
1023
1024         odst = ip6->ip6_dst;
1025         /* Run through list of hooks for output packets. */
1026         switch (pfil_run_hooks(V_inet6_pfil_head, &m, ifp, PFIL_OUT, inp)) {
1027         case PFIL_PASS:
1028                 ip6 = mtod(m, struct ip6_hdr *);
1029                 break;
1030         case PFIL_DROPPED:
1031                 error = EACCES;
1032                 /* FALLTHROUGH */
1033         case PFIL_CONSUMED:
1034                 goto done;
1035         }
1036
1037         needfiblookup = 0;
1038         /* See if destination IP address was changed by packet filter. */
1039         if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
1040                 m->m_flags |= M_SKIP_FIREWALL;
1041                 /* If destination is now ourself drop to ip6_input(). */
1042                 if (in6_localip(&ip6->ip6_dst)) {
1043                         m->m_flags |= M_FASTFWD_OURS;
1044                         if (m->m_pkthdr.rcvif == NULL)
1045                                 m->m_pkthdr.rcvif = V_loif;
1046                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1047                                 m->m_pkthdr.csum_flags |=
1048                                     CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
1049                                 m->m_pkthdr.csum_data = 0xffff;
1050                         }
1051 #if defined(SCTP) || defined(SCTP_SUPPORT)
1052                         if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
1053                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
1054 #endif
1055                         error = netisr_queue(NETISR_IPV6, m);
1056                         goto done;
1057                 } else {
1058                         if (ro != NULL)
1059                                 RO_INVALIDATE_CACHE(ro);
1060                         needfiblookup = 1; /* Redo the routing table lookup. */
1061                 }
1062         }
1063         /* See if fib was changed by packet filter. */
1064         if (fibnum != M_GETFIB(m)) {
1065                 m->m_flags |= M_SKIP_FIREWALL;
1066                 fibnum = M_GETFIB(m);
1067                 if (ro != NULL)
1068                         RO_INVALIDATE_CACHE(ro);
1069                 needfiblookup = 1;
1070         }
1071         if (needfiblookup)
1072                 goto again;
1073
1074         /* See if local, if yes, send it to netisr. */
1075         if (m->m_flags & M_FASTFWD_OURS) {
1076                 if (m->m_pkthdr.rcvif == NULL)
1077                         m->m_pkthdr.rcvif = V_loif;
1078                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1079                         m->m_pkthdr.csum_flags |=
1080                             CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
1081                         m->m_pkthdr.csum_data = 0xffff;
1082                 }
1083 #if defined(SCTP) || defined(SCTP_SUPPORT)
1084                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
1085                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
1086 #endif
1087                 error = netisr_queue(NETISR_IPV6, m);
1088                 goto done;
1089         }
1090         /* Or forward to some other address? */
1091         if ((m->m_flags & M_IP6_NEXTHOP) &&
1092             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
1093                 if (ro != NULL)
1094                         dst = (struct sockaddr_in6 *)&ro->ro_dst;
1095                 else
1096                         dst = &sin6;
1097                 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
1098                 m->m_flags |= M_SKIP_FIREWALL;
1099                 m->m_flags &= ~M_IP6_NEXTHOP;
1100                 m_tag_delete(m, fwd_tag);
1101                 goto again;
1102         }
1103
1104 passout:
1105         if (vlan_pcp > -1)
1106                 EVL_APPLY_PRI(m, vlan_pcp);
1107         /*
1108          * Send the packet to the outgoing interface.
1109          * If necessary, do IPv6 fragmentation before sending.
1110          *
1111          * The logic here is rather complex:
1112          * 1: normal case (dontfrag == 0, alwaysfrag == 0)
1113          * 1-a: send as is if tlen <= path mtu
1114          * 1-b: fragment if tlen > path mtu
1115          *
1116          * 2: if user asks us not to fragment (dontfrag == 1)
1117          * 2-a: send as is if tlen <= interface mtu
1118          * 2-b: error if tlen > interface mtu
1119          *
1120          * 3: if we always need to attach fragment header (alwaysfrag == 1)
1121          *      always fragment
1122          *
1123          * 4: if dontfrag == 1 && alwaysfrag == 1
1124          *      error, as we cannot handle this conflicting request.
1125          */
1126         sw_csum = m->m_pkthdr.csum_flags;
1127         if (!hdrsplit) {
1128                 tso = ((sw_csum & ifp->if_hwassist &
1129                     (CSUM_TSO | CSUM_INNER_TSO)) != 0) ? 1 : 0;
1130                 sw_csum &= ~ifp->if_hwassist;
1131         } else
1132                 tso = 0;
1133         /*
1134          * If we added extension headers, we will not do TSO and calculate the
1135          * checksums ourselves for now.
1136          * XXX-BZ  Need a framework to know when the NIC can handle it, even
1137          * with ext. hdrs.
1138          */
1139         error = ip6_output_delayed_csum(m, ifp, sw_csum, plen, optlen, false);
1140         if (error != 0)
1141                 goto bad;
1142         /* XXX-BZ m->m_pkthdr.csum_flags &= ~ifp->if_hwassist; */
1143         tlen = m->m_pkthdr.len;
1144
1145         if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
1146                 dontfrag = 1;
1147         else
1148                 dontfrag = 0;
1149         if (dontfrag && alwaysfrag) {   /* Case 4. */
1150                 /* Conflicting request - can't transmit. */
1151                 error = EMSGSIZE;
1152                 goto bad;
1153         }
1154         if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) {      /* Case 2-b. */
1155                 /*
1156                  * Even if the DONTFRAG option is specified, we cannot send the
1157                  * packet when the data length is larger than the MTU of the
1158                  * outgoing interface.
1159                  * Notify the error by sending IPV6_PATHMTU ancillary data if
1160                  * application wanted to know the MTU value. Also return an
1161                  * error code (this is not described in the API spec).
1162                  */
1163                 if (inp != NULL)
1164                         ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu);
1165                 error = EMSGSIZE;
1166                 goto bad;
1167         }
1168
1169         /* Transmit packet without fragmentation. */
1170         if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* Cases 1-a and 2-a. */
1171                 struct in6_ifaddr *ia6;
1172
1173                 ip6 = mtod(m, struct ip6_hdr *);
1174                 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
1175                 if (ia6) {
1176                         /* Record statistics for this interface address. */
1177                         counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
1178                         counter_u64_add(ia6->ia_ifa.ifa_obytes,
1179                             m->m_pkthdr.len);
1180                         ifa_free(&ia6->ia_ifa);
1181                 }
1182                 error = ip6_output_send(inp, ifp, origifp, m, dst, ro,
1183                     (flags & IP_NO_SND_TAG_RL) ? false : true);
1184                 goto done;
1185         }
1186
1187         /* Try to fragment the packet.  Cases 1-b and 3. */
1188         if (mtu < IPV6_MMTU) {
1189                 /* Path MTU cannot be less than IPV6_MMTU. */
1190                 error = EMSGSIZE;
1191                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1192                 goto bad;
1193         } else if (ip6->ip6_plen == 0) {
1194                 /* Jumbo payload cannot be fragmented. */
1195                 error = EMSGSIZE;
1196                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1197                 goto bad;
1198         } else {
1199                 u_char nextproto;
1200
1201                 /*
1202                  * Too large for the destination or interface;
1203                  * fragment if possible.
1204                  * Must be able to put at least 8 bytes per fragment.
1205                  */
1206                 if (mtu > IPV6_MAXPACKET)
1207                         mtu = IPV6_MAXPACKET;
1208
1209                 len = (mtu - unfragpartlen - sizeof(struct ip6_frag)) & ~7;
1210                 if (len < 8) {
1211                         error = EMSGSIZE;
1212                         in6_ifstat_inc(ifp, ifs6_out_fragfail);
1213                         goto bad;
1214                 }
1215
1216                 /*
1217                  * If the interface will not calculate checksums on
1218                  * fragmented packets, then do it here.
1219                  * XXX-BZ handle the hw offloading case.  Need flags.
1220                  */
1221                 error = ip6_output_delayed_csum(m, ifp, m->m_pkthdr.csum_flags,
1222                     plen, optlen, true);
1223                 if (error != 0)
1224                         goto bad;
1225
1226                 /*
1227                  * Change the next header field of the last header in the
1228                  * unfragmentable part.
1229                  */
1230                 if (exthdrs.ip6e_rthdr) {
1231                         nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
1232                         *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
1233                 } else if (exthdrs.ip6e_dest1) {
1234                         nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
1235                         *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
1236                 } else if (exthdrs.ip6e_hbh) {
1237                         nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
1238                         *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
1239                 } else {
1240                         ip6 = mtod(m, struct ip6_hdr *);
1241                         nextproto = ip6->ip6_nxt;
1242                         ip6->ip6_nxt = IPPROTO_FRAGMENT;
1243                 }
1244
1245                 /*
1246                  * Loop through length of segment after first fragment,
1247                  * make new header and copy data of each part and link onto
1248                  * chain.
1249                  */
1250                 m0 = m;
1251                 id = htonl(ip6_randomid());
1252                 error = ip6_fragment(ifp, m, unfragpartlen, nextproto,len, id);
1253                 if (error != 0)
1254                         goto sendorfree;
1255
1256                 in6_ifstat_inc(ifp, ifs6_out_fragok);
1257         }
1258
1259         /* Remove leading garbage. */
1260 sendorfree:
1261         m = m0->m_nextpkt;
1262         m0->m_nextpkt = 0;
1263         m_freem(m0);
1264         for (; m; m = m0) {
1265                 m0 = m->m_nextpkt;
1266                 m->m_nextpkt = 0;
1267                 if (error == 0) {
1268                         /* Record statistics for this interface address. */
1269                         if (ia) {
1270                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1271                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
1272                                     m->m_pkthdr.len);
1273                         }
1274                         if (vlan_pcp > -1)
1275                                 EVL_APPLY_PRI(m, vlan_pcp);
1276                         error = ip6_output_send(inp, ifp, origifp, m, dst, ro,
1277                             true);
1278                 } else
1279                         m_freem(m);
1280         }
1281
1282         if (error == 0)
1283                 IP6STAT_INC(ip6s_fragmented);
1284
1285 done:
1286         return (error);
1287
1288 freehdrs:
1289         m_freem(exthdrs.ip6e_hbh);      /* m_freem() checks if mbuf is NULL. */
1290         m_freem(exthdrs.ip6e_dest1);
1291         m_freem(exthdrs.ip6e_rthdr);
1292         m_freem(exthdrs.ip6e_dest2);
1293         /* FALLTHROUGH */
1294 bad:
1295         if (m)
1296                 m_freem(m);
1297         goto done;
1298 }
1299
1300 static int
1301 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1302 {
1303         struct mbuf *m;
1304
1305         if (hlen > MCLBYTES)
1306                 return (ENOBUFS); /* XXX */
1307
1308         if (hlen > MLEN)
1309                 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1310         else
1311                 m = m_get(M_NOWAIT, MT_DATA);
1312         if (m == NULL)
1313                 return (ENOBUFS);
1314         m->m_len = hlen;
1315         if (hdr)
1316                 bcopy(hdr, mtod(m, caddr_t), hlen);
1317
1318         *mp = m;
1319         return (0);
1320 }
1321
1322 /*
1323  * Insert jumbo payload option.
1324  */
1325 static int
1326 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1327 {
1328         struct mbuf *mopt;
1329         u_char *optbuf;
1330         u_int32_t v;
1331
1332 #define JUMBOOPTLEN     8       /* length of jumbo payload option and padding */
1333
1334         /*
1335          * If there is no hop-by-hop options header, allocate new one.
1336          * If there is one but it doesn't have enough space to store the
1337          * jumbo payload option, allocate a cluster to store the whole options.
1338          * Otherwise, use it to store the options.
1339          */
1340         if (exthdrs->ip6e_hbh == NULL) {
1341                 mopt = m_get(M_NOWAIT, MT_DATA);
1342                 if (mopt == NULL)
1343                         return (ENOBUFS);
1344                 mopt->m_len = JUMBOOPTLEN;
1345                 optbuf = mtod(mopt, u_char *);
1346                 optbuf[1] = 0;  /* = ((JUMBOOPTLEN) >> 3) - 1 */
1347                 exthdrs->ip6e_hbh = mopt;
1348         } else {
1349                 struct ip6_hbh *hbh;
1350
1351                 mopt = exthdrs->ip6e_hbh;
1352                 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1353                         /*
1354                          * XXX assumption:
1355                          * - exthdrs->ip6e_hbh is not referenced from places
1356                          *   other than exthdrs.
1357                          * - exthdrs->ip6e_hbh is not an mbuf chain.
1358                          */
1359                         int oldoptlen = mopt->m_len;
1360                         struct mbuf *n;
1361
1362                         /*
1363                          * XXX: give up if the whole (new) hbh header does
1364                          * not fit even in an mbuf cluster.
1365                          */
1366                         if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1367                                 return (ENOBUFS);
1368
1369                         /*
1370                          * As a consequence, we must always prepare a cluster
1371                          * at this point.
1372                          */
1373                         n = m_getcl(M_NOWAIT, MT_DATA, 0);
1374                         if (n == NULL)
1375                                 return (ENOBUFS);
1376                         n->m_len = oldoptlen + JUMBOOPTLEN;
1377                         bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1378                             oldoptlen);
1379                         optbuf = mtod(n, caddr_t) + oldoptlen;
1380                         m_freem(mopt);
1381                         mopt = exthdrs->ip6e_hbh = n;
1382                 } else {
1383                         optbuf = mtod(mopt, u_char *) + mopt->m_len;
1384                         mopt->m_len += JUMBOOPTLEN;
1385                 }
1386                 optbuf[0] = IP6OPT_PADN;
1387                 optbuf[1] = 1;
1388
1389                 /*
1390                  * Adjust the header length according to the pad and
1391                  * the jumbo payload option.
1392                  */
1393                 hbh = mtod(mopt, struct ip6_hbh *);
1394                 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1395         }
1396
1397         /* fill in the option. */
1398         optbuf[2] = IP6OPT_JUMBO;
1399         optbuf[3] = 4;
1400         v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1401         bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1402
1403         /* finally, adjust the packet header length */
1404         exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1405
1406         return (0);
1407 #undef JUMBOOPTLEN
1408 }
1409
1410 /*
1411  * Insert fragment header and copy unfragmentable header portions.
1412  */
1413 static int
1414 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1415     struct ip6_frag **frghdrp)
1416 {
1417         struct mbuf *n, *mlast;
1418
1419         if (hlen > sizeof(struct ip6_hdr)) {
1420                 n = m_copym(m0, sizeof(struct ip6_hdr),
1421                     hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1422                 if (n == NULL)
1423                         return (ENOBUFS);
1424                 m->m_next = n;
1425         } else
1426                 n = m;
1427
1428         /* Search for the last mbuf of unfragmentable part. */
1429         for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1430                 ;
1431
1432         if (M_WRITABLE(mlast) &&
1433             M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1434                 /* use the trailing space of the last mbuf for the fragment hdr */
1435                 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1436                     mlast->m_len);
1437                 mlast->m_len += sizeof(struct ip6_frag);
1438                 m->m_pkthdr.len += sizeof(struct ip6_frag);
1439         } else {
1440                 /* allocate a new mbuf for the fragment header */
1441                 struct mbuf *mfrg;
1442
1443                 mfrg = m_get(M_NOWAIT, MT_DATA);
1444                 if (mfrg == NULL)
1445                         return (ENOBUFS);
1446                 mfrg->m_len = sizeof(struct ip6_frag);
1447                 *frghdrp = mtod(mfrg, struct ip6_frag *);
1448                 mlast->m_next = mfrg;
1449         }
1450
1451         return (0);
1452 }
1453
1454 /*
1455  * Calculates IPv6 path mtu for destination @dst.
1456  * Resulting MTU is stored in @mtup.
1457  *
1458  * Returns 0 on success.
1459  */
1460 static int
1461 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup)
1462 {
1463         struct epoch_tracker et;
1464         struct nhop_object *nh;
1465         struct in6_addr kdst;
1466         uint32_t scopeid;
1467         int error;
1468
1469         in6_splitscope(dst, &kdst, &scopeid);
1470
1471         NET_EPOCH_ENTER(et);
1472         nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0);
1473         if (nh != NULL)
1474                 error = ip6_calcmtu(nh->nh_ifp, dst, nh->nh_mtu, mtup, NULL, 0);
1475         else
1476                 error = EHOSTUNREACH;
1477         NET_EPOCH_EXIT(et);
1478
1479         return (error);
1480 }
1481
1482 /*
1483  * Calculates IPv6 path MTU for @dst based on transmit @ifp,
1484  * and cached data in @ro_pmtu.
1485  * MTU from (successful) route lookup is saved (along with dst)
1486  * inside @ro_pmtu to avoid subsequent route lookups after packet
1487  * filter processing.
1488  *
1489  * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1490  * Returns 0 on success.
1491  */
1492 static int
1493 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup,
1494     struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup,
1495     int *alwaysfragp, u_int fibnum, u_int proto)
1496 {
1497         struct nhop_object *nh;
1498         struct in6_addr kdst;
1499         uint32_t scopeid;
1500         struct sockaddr_in6 *sa6_dst, sin6;
1501         u_long mtu;
1502
1503         NET_EPOCH_ASSERT();
1504
1505         mtu = 0;
1506         if (ro_pmtu == NULL || do_lookup) {
1507                 /*
1508                  * Here ro_pmtu has final destination address, while
1509                  * ro might represent immediate destination.
1510                  * Use ro_pmtu destination since mtu might differ.
1511                  */
1512                 if (ro_pmtu != NULL) {
1513                         sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1514                         if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))
1515                                 ro_pmtu->ro_mtu = 0;
1516                 } else
1517                         sa6_dst = &sin6;
1518
1519                 if (ro_pmtu == NULL || ro_pmtu->ro_mtu == 0) {
1520                         bzero(sa6_dst, sizeof(*sa6_dst));
1521                         sa6_dst->sin6_family = AF_INET6;
1522                         sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1523                         sa6_dst->sin6_addr = *dst;
1524
1525                         in6_splitscope(dst, &kdst, &scopeid);
1526                         nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0);
1527                         if (nh != NULL) {
1528                                 mtu = nh->nh_mtu;
1529                                 if (ro_pmtu != NULL)
1530                                         ro_pmtu->ro_mtu = mtu;
1531                         }
1532                 } else
1533                         mtu = ro_pmtu->ro_mtu;
1534         }
1535
1536         if (ro_pmtu != NULL && ro_pmtu->ro_nh != NULL)
1537                 mtu = ro_pmtu->ro_nh->nh_mtu;
1538
1539         return (ip6_calcmtu(ifp, dst, mtu, mtup, alwaysfragp, proto));
1540 }
1541
1542 /*
1543  * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and
1544  * hostcache data for @dst.
1545  * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1546  *
1547  * Returns 0 on success.
1548  */
1549 static int
1550 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu,
1551     u_long *mtup, int *alwaysfragp, u_int proto)
1552 {
1553         u_long mtu = 0;
1554         int alwaysfrag = 0;
1555         int error = 0;
1556
1557         if (rt_mtu > 0) {
1558                 u_int32_t ifmtu;
1559                 struct in_conninfo inc;
1560
1561                 bzero(&inc, sizeof(inc));
1562                 inc.inc_flags |= INC_ISIPV6;
1563                 inc.inc6_faddr = *dst;
1564
1565                 ifmtu = IN6_LINKMTU(ifp);
1566
1567                 /* TCP is known to react to pmtu changes so skip hc */
1568                 if (proto != IPPROTO_TCP)
1569                         mtu = tcp_hc_getmtu(&inc);
1570
1571                 if (mtu)
1572                         mtu = min(mtu, rt_mtu);
1573                 else
1574                         mtu = rt_mtu;
1575                 if (mtu == 0)
1576                         mtu = ifmtu;
1577                 else if (mtu < IPV6_MMTU) {
1578                         /*
1579                          * RFC2460 section 5, last paragraph:
1580                          * if we record ICMPv6 too big message with
1581                          * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1582                          * or smaller, with framgent header attached.
1583                          * (fragment header is needed regardless from the
1584                          * packet size, for translators to identify packets)
1585                          */
1586                         alwaysfrag = 1;
1587                         mtu = IPV6_MMTU;
1588                 }
1589         } else if (ifp) {
1590                 mtu = IN6_LINKMTU(ifp);
1591         } else
1592                 error = EHOSTUNREACH; /* XXX */
1593
1594         *mtup = mtu;
1595         if (alwaysfragp)
1596                 *alwaysfragp = alwaysfrag;
1597         return (error);
1598 }
1599
1600 /*
1601  * IP6 socket option processing.
1602  */
1603 int
1604 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1605 {
1606         int optdatalen, uproto;
1607         void *optdata;
1608         struct inpcb *inp = sotoinpcb(so);
1609         int error, optval;
1610         int level, op, optname;
1611         int optlen;
1612         struct thread *td;
1613 #ifdef  RSS
1614         uint32_t rss_bucket;
1615         int retval;
1616 #endif
1617
1618 /*
1619  * Don't use more than a quarter of mbuf clusters.  N.B.:
1620  * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow
1621  * on LP64 architectures, so cast to u_long to avoid undefined
1622  * behavior.  ILP32 architectures cannot have nmbclusters
1623  * large enough to overflow for other reasons.
1624  */
1625 #define IPV6_PKTOPTIONS_MBUF_LIMIT      ((u_long)nmbclusters * MCLBYTES / 4)
1626
1627         level = sopt->sopt_level;
1628         op = sopt->sopt_dir;
1629         optname = sopt->sopt_name;
1630         optlen = sopt->sopt_valsize;
1631         td = sopt->sopt_td;
1632         error = 0;
1633         optval = 0;
1634         uproto = (int)so->so_proto->pr_protocol;
1635
1636         if (level != IPPROTO_IPV6) {
1637                 error = EINVAL;
1638
1639                 if (sopt->sopt_level == SOL_SOCKET &&
1640                     sopt->sopt_dir == SOPT_SET) {
1641                         switch (sopt->sopt_name) {
1642                         case SO_REUSEADDR:
1643                                 INP_WLOCK(inp);
1644                                 if ((so->so_options & SO_REUSEADDR) != 0)
1645                                         inp->inp_flags2 |= INP_REUSEADDR;
1646                                 else
1647                                         inp->inp_flags2 &= ~INP_REUSEADDR;
1648                                 INP_WUNLOCK(inp);
1649                                 error = 0;
1650                                 break;
1651                         case SO_REUSEPORT:
1652                                 INP_WLOCK(inp);
1653                                 if ((so->so_options & SO_REUSEPORT) != 0)
1654                                         inp->inp_flags2 |= INP_REUSEPORT;
1655                                 else
1656                                         inp->inp_flags2 &= ~INP_REUSEPORT;
1657                                 INP_WUNLOCK(inp);
1658                                 error = 0;
1659                                 break;
1660                         case SO_REUSEPORT_LB:
1661                                 INP_WLOCK(inp);
1662                                 if ((so->so_options & SO_REUSEPORT_LB) != 0)
1663                                         inp->inp_flags2 |= INP_REUSEPORT_LB;
1664                                 else
1665                                         inp->inp_flags2 &= ~INP_REUSEPORT_LB;
1666                                 INP_WUNLOCK(inp);
1667                                 error = 0;
1668                                 break;
1669                         case SO_SETFIB:
1670                                 INP_WLOCK(inp);
1671                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
1672                                 INP_WUNLOCK(inp);
1673                                 error = 0;
1674                                 break;
1675                         case SO_MAX_PACING_RATE:
1676 #ifdef RATELIMIT
1677                                 INP_WLOCK(inp);
1678                                 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1679                                 INP_WUNLOCK(inp);
1680                                 error = 0;
1681 #else
1682                                 error = EOPNOTSUPP;
1683 #endif
1684                                 break;
1685                         default:
1686                                 break;
1687                         }
1688                 }
1689         } else {                /* level == IPPROTO_IPV6 */
1690                 switch (op) {
1691                 case SOPT_SET:
1692                         switch (optname) {
1693                         case IPV6_2292PKTOPTIONS:
1694 #ifdef IPV6_PKTOPTIONS
1695                         case IPV6_PKTOPTIONS:
1696 #endif
1697                         {
1698                                 struct mbuf *m;
1699
1700                                 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) {
1701                                         printf("ip6_ctloutput: mbuf limit hit\n");
1702                                         error = ENOBUFS;
1703                                         break;
1704                                 }
1705
1706                                 error = soopt_getm(sopt, &m); /* XXX */
1707                                 if (error != 0)
1708                                         break;
1709                                 error = soopt_mcopyin(sopt, m); /* XXX */
1710                                 if (error != 0)
1711                                         break;
1712                                 INP_WLOCK(inp);
1713                                 error = ip6_pcbopts(&inp->in6p_outputopts, m,
1714                                     so, sopt);
1715                                 INP_WUNLOCK(inp);
1716                                 m_freem(m); /* XXX */
1717                                 break;
1718                         }
1719
1720                         /*
1721                          * Use of some Hop-by-Hop options or some
1722                          * Destination options, might require special
1723                          * privilege.  That is, normal applications
1724                          * (without special privilege) might be forbidden
1725                          * from setting certain options in outgoing packets,
1726                          * and might never see certain options in received
1727                          * packets. [RFC 2292 Section 6]
1728                          * KAME specific note:
1729                          *  KAME prevents non-privileged users from sending or
1730                          *  receiving ANY hbh/dst options in order to avoid
1731                          *  overhead of parsing options in the kernel.
1732                          */
1733                         case IPV6_RECVHOPOPTS:
1734                         case IPV6_RECVDSTOPTS:
1735                         case IPV6_RECVRTHDRDSTOPTS:
1736                                 if (td != NULL) {
1737                                         error = priv_check(td,
1738                                             PRIV_NETINET_SETHDROPTS);
1739                                         if (error)
1740                                                 break;
1741                                 }
1742                                 /* FALLTHROUGH */
1743                         case IPV6_UNICAST_HOPS:
1744                         case IPV6_HOPLIMIT:
1745
1746                         case IPV6_RECVPKTINFO:
1747                         case IPV6_RECVHOPLIMIT:
1748                         case IPV6_RECVRTHDR:
1749                         case IPV6_RECVPATHMTU:
1750                         case IPV6_RECVTCLASS:
1751                         case IPV6_RECVFLOWID:
1752 #ifdef  RSS
1753                         case IPV6_RECVRSSBUCKETID:
1754 #endif
1755                         case IPV6_V6ONLY:
1756                         case IPV6_AUTOFLOWLABEL:
1757                         case IPV6_ORIGDSTADDR:
1758                         case IPV6_BINDANY:
1759                         case IPV6_BINDMULTI:
1760 #ifdef  RSS
1761                         case IPV6_RSS_LISTEN_BUCKET:
1762 #endif
1763                         case IPV6_VLAN_PCP:
1764                                 if (optname == IPV6_BINDANY && td != NULL) {
1765                                         error = priv_check(td,
1766                                             PRIV_NETINET_BINDANY);
1767                                         if (error)
1768                                                 break;
1769                                 }
1770
1771                                 if (optlen != sizeof(int)) {
1772                                         error = EINVAL;
1773                                         break;
1774                                 }
1775                                 error = sooptcopyin(sopt, &optval,
1776                                         sizeof optval, sizeof optval);
1777                                 if (error)
1778                                         break;
1779                                 switch (optname) {
1780                                 case IPV6_UNICAST_HOPS:
1781                                         if (optval < -1 || optval >= 256)
1782                                                 error = EINVAL;
1783                                         else {
1784                                                 /* -1 = kernel default */
1785                                                 inp->in6p_hops = optval;
1786                                                 if ((inp->inp_vflag &
1787                                                      INP_IPV4) != 0)
1788                                                         inp->inp_ip_ttl = optval;
1789                                         }
1790                                         break;
1791 #define OPTSET(bit) \
1792 do { \
1793         INP_WLOCK(inp); \
1794         if (optval) \
1795                 inp->inp_flags |= (bit); \
1796         else \
1797                 inp->inp_flags &= ~(bit); \
1798         INP_WUNLOCK(inp); \
1799 } while (/*CONSTCOND*/ 0)
1800 #define OPTSET2292(bit) \
1801 do { \
1802         INP_WLOCK(inp); \
1803         inp->inp_flags |= IN6P_RFC2292; \
1804         if (optval) \
1805                 inp->inp_flags |= (bit); \
1806         else \
1807                 inp->inp_flags &= ~(bit); \
1808         INP_WUNLOCK(inp); \
1809 } while (/*CONSTCOND*/ 0)
1810 #define OPTBIT(bit) (inp->inp_flags & (bit) ? 1 : 0)
1811
1812 #define OPTSET2_N(bit, val) do {                                        \
1813         if (val)                                                        \
1814                 inp->inp_flags2 |= bit;                                 \
1815         else                                                            \
1816                 inp->inp_flags2 &= ~bit;                                \
1817 } while (0)
1818 #define OPTSET2(bit, val) do {                                          \
1819         INP_WLOCK(inp);                                                 \
1820         OPTSET2_N(bit, val);                                            \
1821         INP_WUNLOCK(inp);                                               \
1822 } while (0)
1823 #define OPTBIT2(bit) (inp->inp_flags2 & (bit) ? 1 : 0)
1824 #define OPTSET2292_EXCLUSIVE(bit)                                       \
1825 do {                                                                    \
1826         INP_WLOCK(inp);                                                 \
1827         if (OPTBIT(IN6P_RFC2292)) {                                     \
1828                 error = EINVAL;                                         \
1829         } else {                                                        \
1830                 if (optval)                                             \
1831                         inp->inp_flags |= (bit);                        \
1832                 else                                                    \
1833                         inp->inp_flags &= ~(bit);                       \
1834         }                                                               \
1835         INP_WUNLOCK(inp);                                               \
1836 } while (/*CONSTCOND*/ 0)
1837
1838                                 case IPV6_RECVPKTINFO:
1839                                         OPTSET2292_EXCLUSIVE(IN6P_PKTINFO);
1840                                         break;
1841
1842                                 case IPV6_HOPLIMIT:
1843                                 {
1844                                         struct ip6_pktopts **optp;
1845
1846                                         /* cannot mix with RFC2292 */
1847                                         if (OPTBIT(IN6P_RFC2292)) {
1848                                                 error = EINVAL;
1849                                                 break;
1850                                         }
1851                                         INP_WLOCK(inp);
1852                                         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1853                                                 INP_WUNLOCK(inp);
1854                                                 return (ECONNRESET);
1855                                         }
1856                                         optp = &inp->in6p_outputopts;
1857                                         error = ip6_pcbopt(IPV6_HOPLIMIT,
1858                                             (u_char *)&optval, sizeof(optval),
1859                                             optp, (td != NULL) ? td->td_ucred :
1860                                             NULL, uproto);
1861                                         INP_WUNLOCK(inp);
1862                                         break;
1863                                 }
1864
1865                                 case IPV6_RECVHOPLIMIT:
1866                                         OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT);
1867                                         break;
1868
1869                                 case IPV6_RECVHOPOPTS:
1870                                         OPTSET2292_EXCLUSIVE(IN6P_HOPOPTS);
1871                                         break;
1872
1873                                 case IPV6_RECVDSTOPTS:
1874                                         OPTSET2292_EXCLUSIVE(IN6P_DSTOPTS);
1875                                         break;
1876
1877                                 case IPV6_RECVRTHDRDSTOPTS:
1878                                         OPTSET2292_EXCLUSIVE(IN6P_RTHDRDSTOPTS);
1879                                         break;
1880
1881                                 case IPV6_RECVRTHDR:
1882                                         OPTSET2292_EXCLUSIVE(IN6P_RTHDR);
1883                                         break;
1884
1885                                 case IPV6_RECVPATHMTU:
1886                                         /*
1887                                          * We ignore this option for TCP
1888                                          * sockets.
1889                                          * (RFC3542 leaves this case
1890                                          * unspecified.)
1891                                          */
1892                                         if (uproto != IPPROTO_TCP)
1893                                                 OPTSET(IN6P_MTU);
1894                                         break;
1895
1896                                 case IPV6_RECVFLOWID:
1897                                         OPTSET2(INP_RECVFLOWID, optval);
1898                                         break;
1899
1900 #ifdef  RSS
1901                                 case IPV6_RECVRSSBUCKETID:
1902                                         OPTSET2(INP_RECVRSSBUCKETID, optval);
1903                                         break;
1904 #endif
1905
1906                                 case IPV6_V6ONLY:
1907                                         INP_WLOCK(inp);
1908                                         if (inp->inp_lport ||
1909                                             !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1910                                                 /*
1911                                                  * The socket is already bound.
1912                                                  */
1913                                                 INP_WUNLOCK(inp);
1914                                                 error = EINVAL;
1915                                                 break;
1916                                         }
1917                                         if (optval) {
1918                                                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
1919                                                 inp->inp_vflag &= ~INP_IPV4;
1920                                         } else {
1921                                                 inp->inp_flags &= ~IN6P_IPV6_V6ONLY;
1922                                                 inp->inp_vflag |= INP_IPV4;
1923                                         }
1924                                         INP_WUNLOCK(inp);
1925                                         break;
1926                                 case IPV6_RECVTCLASS:
1927                                         /* cannot mix with RFC2292 XXX */
1928                                         OPTSET2292_EXCLUSIVE(IN6P_TCLASS);
1929                                         break;
1930                                 case IPV6_AUTOFLOWLABEL:
1931                                         OPTSET(IN6P_AUTOFLOWLABEL);
1932                                         break;
1933
1934                                 case IPV6_ORIGDSTADDR:
1935                                         OPTSET2(INP_ORIGDSTADDR, optval);
1936                                         break;
1937                                 case IPV6_BINDANY:
1938                                         OPTSET(INP_BINDANY);
1939                                         break;
1940
1941                                 case IPV6_BINDMULTI:
1942                                         OPTSET2(INP_BINDMULTI, optval);
1943                                         break;
1944 #ifdef  RSS
1945                                 case IPV6_RSS_LISTEN_BUCKET:
1946                                         if ((optval >= 0) &&
1947                                             (optval < rss_getnumbuckets())) {
1948                                                 INP_WLOCK(inp);
1949                                                 inp->inp_rss_listen_bucket = optval;
1950                                                 OPTSET2_N(INP_RSS_BUCKET_SET, 1);
1951                                                 INP_WUNLOCK(inp);
1952                                         } else {
1953                                                 error = EINVAL;
1954                                         }
1955                                         break;
1956 #endif
1957                                 case IPV6_VLAN_PCP:
1958                                         if ((optval >= -1) && (optval <=
1959                                             (INP_2PCP_MASK >> INP_2PCP_SHIFT))) {
1960                                                 if (optval == -1) {
1961                                                         INP_WLOCK(inp);
1962                                                         inp->inp_flags2 &=
1963                                                             ~(INP_2PCP_SET |
1964                                                             INP_2PCP_MASK);
1965                                                         INP_WUNLOCK(inp);
1966                                                 } else {
1967                                                         INP_WLOCK(inp);
1968                                                         inp->inp_flags2 |=
1969                                                             INP_2PCP_SET;
1970                                                         inp->inp_flags2 &=
1971                                                             ~INP_2PCP_MASK;
1972                                                         inp->inp_flags2 |=
1973                                                             optval <<
1974                                                             INP_2PCP_SHIFT;
1975                                                         INP_WUNLOCK(inp);
1976                                                 }
1977                                         } else
1978                                                 error = EINVAL;
1979                                         break;
1980                                 }
1981                                 break;
1982
1983                         case IPV6_TCLASS:
1984                         case IPV6_DONTFRAG:
1985                         case IPV6_USE_MIN_MTU:
1986                         case IPV6_PREFER_TEMPADDR:
1987                                 if (optlen != sizeof(optval)) {
1988                                         error = EINVAL;
1989                                         break;
1990                                 }
1991                                 error = sooptcopyin(sopt, &optval,
1992                                         sizeof optval, sizeof optval);
1993                                 if (error)
1994                                         break;
1995                                 {
1996                                         struct ip6_pktopts **optp;
1997                                         INP_WLOCK(inp);
1998                                         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1999                                                 INP_WUNLOCK(inp);
2000                                                 return (ECONNRESET);
2001                                         }
2002                                         optp = &inp->in6p_outputopts;
2003                                         error = ip6_pcbopt(optname,
2004                                             (u_char *)&optval, sizeof(optval),
2005                                             optp, (td != NULL) ? td->td_ucred :
2006                                             NULL, uproto);
2007                                         INP_WUNLOCK(inp);
2008                                         break;
2009                                 }
2010
2011                         case IPV6_2292PKTINFO:
2012                         case IPV6_2292HOPLIMIT:
2013                         case IPV6_2292HOPOPTS:
2014                         case IPV6_2292DSTOPTS:
2015                         case IPV6_2292RTHDR:
2016                                 /* RFC 2292 */
2017                                 if (optlen != sizeof(int)) {
2018                                         error = EINVAL;
2019                                         break;
2020                                 }
2021                                 error = sooptcopyin(sopt, &optval,
2022                                         sizeof optval, sizeof optval);
2023                                 if (error)
2024                                         break;
2025                                 switch (optname) {
2026                                 case IPV6_2292PKTINFO:
2027                                         OPTSET2292(IN6P_PKTINFO);
2028                                         break;
2029                                 case IPV6_2292HOPLIMIT:
2030                                         OPTSET2292(IN6P_HOPLIMIT);
2031                                         break;
2032                                 case IPV6_2292HOPOPTS:
2033                                         /*
2034                                          * Check super-user privilege.
2035                                          * See comments for IPV6_RECVHOPOPTS.
2036                                          */
2037                                         if (td != NULL) {
2038                                                 error = priv_check(td,
2039                                                     PRIV_NETINET_SETHDROPTS);
2040                                                 if (error)
2041                                                         return (error);
2042                                         }
2043                                         OPTSET2292(IN6P_HOPOPTS);
2044                                         break;
2045                                 case IPV6_2292DSTOPTS:
2046                                         if (td != NULL) {
2047                                                 error = priv_check(td,
2048                                                     PRIV_NETINET_SETHDROPTS);
2049                                                 if (error)
2050                                                         return (error);
2051                                         }
2052                                         OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
2053                                         break;
2054                                 case IPV6_2292RTHDR:
2055                                         OPTSET2292(IN6P_RTHDR);
2056                                         break;
2057                                 }
2058                                 break;
2059                         case IPV6_PKTINFO:
2060                         case IPV6_HOPOPTS:
2061                         case IPV6_RTHDR:
2062                         case IPV6_DSTOPTS:
2063                         case IPV6_RTHDRDSTOPTS:
2064                         case IPV6_NEXTHOP:
2065                         {
2066                                 /* new advanced API (RFC3542) */
2067                                 u_char *optbuf;
2068                                 u_char optbuf_storage[MCLBYTES];
2069                                 int optlen;
2070                                 struct ip6_pktopts **optp;
2071
2072                                 /* cannot mix with RFC2292 */
2073                                 if (OPTBIT(IN6P_RFC2292)) {
2074                                         error = EINVAL;
2075                                         break;
2076                                 }
2077
2078                                 /*
2079                                  * We only ensure valsize is not too large
2080                                  * here.  Further validation will be done
2081                                  * later.
2082                                  */
2083                                 error = sooptcopyin(sopt, optbuf_storage,
2084                                     sizeof(optbuf_storage), 0);
2085                                 if (error)
2086                                         break;
2087                                 optlen = sopt->sopt_valsize;
2088                                 optbuf = optbuf_storage;
2089                                 INP_WLOCK(inp);
2090                                 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
2091                                         INP_WUNLOCK(inp);
2092                                         return (ECONNRESET);
2093                                 }
2094                                 optp = &inp->in6p_outputopts;
2095                                 error = ip6_pcbopt(optname, optbuf, optlen,
2096                                     optp, (td != NULL) ? td->td_ucred : NULL,
2097                                     uproto);
2098                                 INP_WUNLOCK(inp);
2099                                 break;
2100                         }
2101 #undef OPTSET
2102
2103                         case IPV6_MULTICAST_IF:
2104                         case IPV6_MULTICAST_HOPS:
2105                         case IPV6_MULTICAST_LOOP:
2106                         case IPV6_JOIN_GROUP:
2107                         case IPV6_LEAVE_GROUP:
2108                         case IPV6_MSFILTER:
2109                         case MCAST_BLOCK_SOURCE:
2110                         case MCAST_UNBLOCK_SOURCE:
2111                         case MCAST_JOIN_GROUP:
2112                         case MCAST_LEAVE_GROUP:
2113                         case MCAST_JOIN_SOURCE_GROUP:
2114                         case MCAST_LEAVE_SOURCE_GROUP:
2115                                 error = ip6_setmoptions(inp, sopt);
2116                                 break;
2117
2118                         case IPV6_PORTRANGE:
2119                                 error = sooptcopyin(sopt, &optval,
2120                                     sizeof optval, sizeof optval);
2121                                 if (error)
2122                                         break;
2123
2124                                 INP_WLOCK(inp);
2125                                 switch (optval) {
2126                                 case IPV6_PORTRANGE_DEFAULT:
2127                                         inp->inp_flags &= ~(INP_LOWPORT);
2128                                         inp->inp_flags &= ~(INP_HIGHPORT);
2129                                         break;
2130
2131                                 case IPV6_PORTRANGE_HIGH:
2132                                         inp->inp_flags &= ~(INP_LOWPORT);
2133                                         inp->inp_flags |= INP_HIGHPORT;
2134                                         break;
2135
2136                                 case IPV6_PORTRANGE_LOW:
2137                                         inp->inp_flags &= ~(INP_HIGHPORT);
2138                                         inp->inp_flags |= INP_LOWPORT;
2139                                         break;
2140
2141                                 default:
2142                                         error = EINVAL;
2143                                         break;
2144                                 }
2145                                 INP_WUNLOCK(inp);
2146                                 break;
2147
2148 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
2149                         case IPV6_IPSEC_POLICY:
2150                                 if (IPSEC_ENABLED(ipv6)) {
2151                                         error = IPSEC_PCBCTL(ipv6, inp, sopt);
2152                                         break;
2153                                 }
2154                                 /* FALLTHROUGH */
2155 #endif /* IPSEC */
2156
2157                         default:
2158                                 error = ENOPROTOOPT;
2159                                 break;
2160                         }
2161                         break;
2162
2163                 case SOPT_GET:
2164                         switch (optname) {
2165                         case IPV6_2292PKTOPTIONS:
2166 #ifdef IPV6_PKTOPTIONS
2167                         case IPV6_PKTOPTIONS:
2168 #endif
2169                                 /*
2170                                  * RFC3542 (effectively) deprecated the
2171                                  * semantics of the 2292-style pktoptions.
2172                                  * Since it was not reliable in nature (i.e.,
2173                                  * applications had to expect the lack of some
2174                                  * information after all), it would make sense
2175                                  * to simplify this part by always returning
2176                                  * empty data.
2177                                  */
2178                                 sopt->sopt_valsize = 0;
2179                                 break;
2180
2181                         case IPV6_RECVHOPOPTS:
2182                         case IPV6_RECVDSTOPTS:
2183                         case IPV6_RECVRTHDRDSTOPTS:
2184                         case IPV6_UNICAST_HOPS:
2185                         case IPV6_RECVPKTINFO:
2186                         case IPV6_RECVHOPLIMIT:
2187                         case IPV6_RECVRTHDR:
2188                         case IPV6_RECVPATHMTU:
2189
2190                         case IPV6_V6ONLY:
2191                         case IPV6_PORTRANGE:
2192                         case IPV6_RECVTCLASS:
2193                         case IPV6_AUTOFLOWLABEL:
2194                         case IPV6_BINDANY:
2195                         case IPV6_FLOWID:
2196                         case IPV6_FLOWTYPE:
2197                         case IPV6_RECVFLOWID:
2198 #ifdef  RSS
2199                         case IPV6_RSSBUCKETID:
2200                         case IPV6_RECVRSSBUCKETID:
2201 #endif
2202                         case IPV6_BINDMULTI:
2203                         case IPV6_VLAN_PCP:
2204                                 switch (optname) {
2205                                 case IPV6_RECVHOPOPTS:
2206                                         optval = OPTBIT(IN6P_HOPOPTS);
2207                                         break;
2208
2209                                 case IPV6_RECVDSTOPTS:
2210                                         optval = OPTBIT(IN6P_DSTOPTS);
2211                                         break;
2212
2213                                 case IPV6_RECVRTHDRDSTOPTS:
2214                                         optval = OPTBIT(IN6P_RTHDRDSTOPTS);
2215                                         break;
2216
2217                                 case IPV6_UNICAST_HOPS:
2218                                         optval = inp->in6p_hops;
2219                                         break;
2220
2221                                 case IPV6_RECVPKTINFO:
2222                                         optval = OPTBIT(IN6P_PKTINFO);
2223                                         break;
2224
2225                                 case IPV6_RECVHOPLIMIT:
2226                                         optval = OPTBIT(IN6P_HOPLIMIT);
2227                                         break;
2228
2229                                 case IPV6_RECVRTHDR:
2230                                         optval = OPTBIT(IN6P_RTHDR);
2231                                         break;
2232
2233                                 case IPV6_RECVPATHMTU:
2234                                         optval = OPTBIT(IN6P_MTU);
2235                                         break;
2236
2237                                 case IPV6_V6ONLY:
2238                                         optval = OPTBIT(IN6P_IPV6_V6ONLY);
2239                                         break;
2240
2241                                 case IPV6_PORTRANGE:
2242                                     {
2243                                         int flags;
2244                                         flags = inp->inp_flags;
2245                                         if (flags & INP_HIGHPORT)
2246                                                 optval = IPV6_PORTRANGE_HIGH;
2247                                         else if (flags & INP_LOWPORT)
2248                                                 optval = IPV6_PORTRANGE_LOW;
2249                                         else
2250                                                 optval = 0;
2251                                         break;
2252                                     }
2253                                 case IPV6_RECVTCLASS:
2254                                         optval = OPTBIT(IN6P_TCLASS);
2255                                         break;
2256
2257                                 case IPV6_AUTOFLOWLABEL:
2258                                         optval = OPTBIT(IN6P_AUTOFLOWLABEL);
2259                                         break;
2260
2261                                 case IPV6_ORIGDSTADDR:
2262                                         optval = OPTBIT2(INP_ORIGDSTADDR);
2263                                         break;
2264
2265                                 case IPV6_BINDANY:
2266                                         optval = OPTBIT(INP_BINDANY);
2267                                         break;
2268
2269                                 case IPV6_FLOWID:
2270                                         optval = inp->inp_flowid;
2271                                         break;
2272
2273                                 case IPV6_FLOWTYPE:
2274                                         optval = inp->inp_flowtype;
2275                                         break;
2276
2277                                 case IPV6_RECVFLOWID:
2278                                         optval = OPTBIT2(INP_RECVFLOWID);
2279                                         break;
2280 #ifdef  RSS
2281                                 case IPV6_RSSBUCKETID:
2282                                         retval =
2283                                             rss_hash2bucket(inp->inp_flowid,
2284                                             inp->inp_flowtype,
2285                                             &rss_bucket);
2286                                         if (retval == 0)
2287                                                 optval = rss_bucket;
2288                                         else
2289                                                 error = EINVAL;
2290                                         break;
2291
2292                                 case IPV6_RECVRSSBUCKETID:
2293                                         optval = OPTBIT2(INP_RECVRSSBUCKETID);
2294                                         break;
2295 #endif
2296
2297                                 case IPV6_BINDMULTI:
2298                                         optval = OPTBIT2(INP_BINDMULTI);
2299                                         break;
2300
2301                                 case IPV6_VLAN_PCP:
2302                                         if (OPTBIT2(INP_2PCP_SET)) {
2303                                                 optval = (inp->inp_flags2 &
2304                                                             INP_2PCP_MASK) >>
2305                                                             INP_2PCP_SHIFT;
2306                                         } else {
2307                                                 optval = -1;
2308                                         }
2309                                         break;
2310                                 }
2311
2312                                 if (error)
2313                                         break;
2314                                 error = sooptcopyout(sopt, &optval,
2315                                         sizeof optval);
2316                                 break;
2317
2318                         case IPV6_PATHMTU:
2319                         {
2320                                 u_long pmtu = 0;
2321                                 struct ip6_mtuinfo mtuinfo;
2322                                 struct in6_addr addr;
2323
2324                                 if (!(so->so_state & SS_ISCONNECTED))
2325                                         return (ENOTCONN);
2326                                 /*
2327                                  * XXX: we dot not consider the case of source
2328                                  * routing, or optional information to specify
2329                                  * the outgoing interface.
2330                                  * Copy faddr out of inp to avoid holding lock
2331                                  * on inp during route lookup.
2332                                  */
2333                                 INP_RLOCK(inp);
2334                                 bcopy(&inp->in6p_faddr, &addr, sizeof(addr));
2335                                 INP_RUNLOCK(inp);
2336                                 error = ip6_getpmtu_ctl(so->so_fibnum,
2337                                     &addr, &pmtu);
2338                                 if (error)
2339                                         break;
2340                                 if (pmtu > IPV6_MAXPACKET)
2341                                         pmtu = IPV6_MAXPACKET;
2342
2343                                 bzero(&mtuinfo, sizeof(mtuinfo));
2344                                 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
2345                                 optdata = (void *)&mtuinfo;
2346                                 optdatalen = sizeof(mtuinfo);
2347                                 error = sooptcopyout(sopt, optdata,
2348                                     optdatalen);
2349                                 break;
2350                         }
2351
2352                         case IPV6_2292PKTINFO:
2353                         case IPV6_2292HOPLIMIT:
2354                         case IPV6_2292HOPOPTS:
2355                         case IPV6_2292RTHDR:
2356                         case IPV6_2292DSTOPTS:
2357                                 switch (optname) {
2358                                 case IPV6_2292PKTINFO:
2359                                         optval = OPTBIT(IN6P_PKTINFO);
2360                                         break;
2361                                 case IPV6_2292HOPLIMIT:
2362                                         optval = OPTBIT(IN6P_HOPLIMIT);
2363                                         break;
2364                                 case IPV6_2292HOPOPTS:
2365                                         optval = OPTBIT(IN6P_HOPOPTS);
2366                                         break;
2367                                 case IPV6_2292RTHDR:
2368                                         optval = OPTBIT(IN6P_RTHDR);
2369                                         break;
2370                                 case IPV6_2292DSTOPTS:
2371                                         optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
2372                                         break;
2373                                 }
2374                                 error = sooptcopyout(sopt, &optval,
2375                                     sizeof optval);
2376                                 break;
2377                         case IPV6_PKTINFO:
2378                         case IPV6_HOPOPTS:
2379                         case IPV6_RTHDR:
2380                         case IPV6_DSTOPTS:
2381                         case IPV6_RTHDRDSTOPTS:
2382                         case IPV6_NEXTHOP:
2383                         case IPV6_TCLASS:
2384                         case IPV6_DONTFRAG:
2385                         case IPV6_USE_MIN_MTU:
2386                         case IPV6_PREFER_TEMPADDR:
2387                                 error = ip6_getpcbopt(inp, optname, sopt);
2388                                 break;
2389
2390                         case IPV6_MULTICAST_IF:
2391                         case IPV6_MULTICAST_HOPS:
2392                         case IPV6_MULTICAST_LOOP:
2393                         case IPV6_MSFILTER:
2394                                 error = ip6_getmoptions(inp, sopt);
2395                                 break;
2396
2397 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
2398                         case IPV6_IPSEC_POLICY:
2399                                 if (IPSEC_ENABLED(ipv6)) {
2400                                         error = IPSEC_PCBCTL(ipv6, inp, sopt);
2401                                         break;
2402                                 }
2403                                 /* FALLTHROUGH */
2404 #endif /* IPSEC */
2405                         default:
2406                                 error = ENOPROTOOPT;
2407                                 break;
2408                         }
2409                         break;
2410                 }
2411         }
2412         return (error);
2413 }
2414
2415 int
2416 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2417 {
2418         int error = 0, optval, optlen;
2419         const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2420         struct inpcb *inp = sotoinpcb(so);
2421         int level, op, optname;
2422
2423         level = sopt->sopt_level;
2424         op = sopt->sopt_dir;
2425         optname = sopt->sopt_name;
2426         optlen = sopt->sopt_valsize;
2427
2428         if (level != IPPROTO_IPV6) {
2429                 return (EINVAL);
2430         }
2431
2432         switch (optname) {
2433         case IPV6_CHECKSUM:
2434                 /*
2435                  * For ICMPv6 sockets, no modification allowed for checksum
2436                  * offset, permit "no change" values to help existing apps.
2437                  *
2438                  * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2439                  * for an ICMPv6 socket will fail."
2440                  * The current behavior does not meet RFC3542.
2441                  */
2442                 switch (op) {
2443                 case SOPT_SET:
2444                         if (optlen != sizeof(int)) {
2445                                 error = EINVAL;
2446                                 break;
2447                         }
2448                         error = sooptcopyin(sopt, &optval, sizeof(optval),
2449                                             sizeof(optval));
2450                         if (error)
2451                                 break;
2452                         if (optval < -1 || (optval % 2) != 0) {
2453                                 /*
2454                                  * The API assumes non-negative even offset
2455                                  * values or -1 as a special value.
2456                                  */
2457                                 error = EINVAL;
2458                         } else if (so->so_proto->pr_protocol ==
2459                             IPPROTO_ICMPV6) {
2460                                 if (optval != icmp6off)
2461                                         error = EINVAL;
2462                         } else
2463                                 inp->in6p_cksum = optval;
2464                         break;
2465
2466                 case SOPT_GET:
2467                         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2468                                 optval = icmp6off;
2469                         else
2470                                 optval = inp->in6p_cksum;
2471
2472                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2473                         break;
2474
2475                 default:
2476                         error = EINVAL;
2477                         break;
2478                 }
2479                 break;
2480
2481         default:
2482                 error = ENOPROTOOPT;
2483                 break;
2484         }
2485
2486         return (error);
2487 }
2488
2489 /*
2490  * Set up IP6 options in pcb for insertion in output packets or
2491  * specifying behavior of outgoing packets.
2492  */
2493 static int
2494 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2495     struct socket *so, struct sockopt *sopt)
2496 {
2497         struct ip6_pktopts *opt = *pktopt;
2498         int error = 0;
2499         struct thread *td = sopt->sopt_td;
2500
2501         /* turn off any old options. */
2502         if (opt) {
2503 #ifdef DIAGNOSTIC
2504                 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2505                     opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2506                     opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2507                         printf("ip6_pcbopts: all specified options are cleared.\n");
2508 #endif
2509                 ip6_clearpktopts(opt, -1);
2510         } else {
2511                 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT);
2512                 if (opt == NULL)
2513                         return (ENOMEM);
2514         }
2515         *pktopt = NULL;
2516
2517         if (!m || m->m_len == 0) {
2518                 /*
2519                  * Only turning off any previous options, regardless of
2520                  * whether the opt is just created or given.
2521                  */
2522                 free(opt, M_IP6OPT);
2523                 return (0);
2524         }
2525
2526         /*  set options specified by user. */
2527         if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2528             td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2529                 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2530                 free(opt, M_IP6OPT);
2531                 return (error);
2532         }
2533         *pktopt = opt;
2534         return (0);
2535 }
2536
2537 /*
2538  * initialize ip6_pktopts.  beware that there are non-zero default values in
2539  * the struct.
2540  */
2541 void
2542 ip6_initpktopts(struct ip6_pktopts *opt)
2543 {
2544
2545         bzero(opt, sizeof(*opt));
2546         opt->ip6po_hlim = -1;   /* -1 means default hop limit */
2547         opt->ip6po_tclass = -1; /* -1 means default traffic class */
2548         opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2549         opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2550 }
2551
2552 static int
2553 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2554     struct ucred *cred, int uproto)
2555 {
2556         struct ip6_pktopts *opt;
2557
2558         if (*pktopt == NULL) {
2559                 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2560                     M_NOWAIT);
2561                 if (*pktopt == NULL)
2562                         return (ENOBUFS);
2563                 ip6_initpktopts(*pktopt);
2564         }
2565         opt = *pktopt;
2566
2567         return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2568 }
2569
2570 #define GET_PKTOPT_VAR(field, lenexpr) do {                                     \
2571         if (pktopt && pktopt->field) {                                          \
2572                 INP_RUNLOCK(inp);                                               \
2573                 optdata = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK);         \
2574                 malloc_optdata = true;                                          \
2575                 INP_RLOCK(inp);                                                 \
2576                 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
2577                         INP_RUNLOCK(inp);                                       \
2578                         free(optdata, M_TEMP);                                  \
2579                         return (ECONNRESET);                                    \
2580                 }                                                               \
2581                 pktopt = inp->in6p_outputopts;                                  \
2582                 if (pktopt && pktopt->field) {                                  \
2583                         optdatalen = min(lenexpr, sopt->sopt_valsize);          \
2584                         bcopy(&pktopt->field, optdata, optdatalen);             \
2585                 } else {                                                        \
2586                         free(optdata, M_TEMP);                                  \
2587                         optdata = NULL;                                         \
2588                         malloc_optdata = false;                                 \
2589                 }                                                               \
2590         }                                                                       \
2591 } while(0)
2592
2593 #define GET_PKTOPT_EXT_HDR(field) GET_PKTOPT_VAR(field,                         \
2594         (((struct ip6_ext *)pktopt->field)->ip6e_len + 1) << 3)
2595
2596 #define GET_PKTOPT_SOCKADDR(field) GET_PKTOPT_VAR(field,                        \
2597         pktopt->field->sa_len)
2598
2599 static int
2600 ip6_getpcbopt(struct inpcb *inp, int optname, struct sockopt *sopt)
2601 {
2602         void *optdata = NULL;
2603         bool malloc_optdata = false;
2604         int optdatalen = 0;
2605         int error = 0;
2606         struct in6_pktinfo null_pktinfo;
2607         int deftclass = 0, on;
2608         int defminmtu = IP6PO_MINMTU_MCASTONLY;
2609         int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2610         struct ip6_pktopts *pktopt;
2611
2612         INP_RLOCK(inp);
2613         pktopt = inp->in6p_outputopts;
2614
2615         switch (optname) {
2616         case IPV6_PKTINFO:
2617                 optdata = (void *)&null_pktinfo;
2618                 if (pktopt && pktopt->ip6po_pktinfo) {
2619                         bcopy(pktopt->ip6po_pktinfo, &null_pktinfo,
2620                             sizeof(null_pktinfo));
2621                         in6_clearscope(&null_pktinfo.ipi6_addr);
2622                 } else {
2623                         /* XXX: we don't have to do this every time... */
2624                         bzero(&null_pktinfo, sizeof(null_pktinfo));
2625                 }
2626                 optdatalen = sizeof(struct in6_pktinfo);
2627                 break;
2628         case IPV6_TCLASS:
2629                 if (pktopt && pktopt->ip6po_tclass >= 0)
2630                         deftclass = pktopt->ip6po_tclass;
2631                 optdata = (void *)&deftclass;
2632                 optdatalen = sizeof(int);
2633                 break;
2634         case IPV6_HOPOPTS:
2635                 GET_PKTOPT_EXT_HDR(ip6po_hbh);
2636                 break;
2637         case IPV6_RTHDR:
2638                 GET_PKTOPT_EXT_HDR(ip6po_rthdr);
2639                 break;
2640         case IPV6_RTHDRDSTOPTS:
2641                 GET_PKTOPT_EXT_HDR(ip6po_dest1);
2642                 break;
2643         case IPV6_DSTOPTS:
2644                 GET_PKTOPT_EXT_HDR(ip6po_dest2);
2645                 break;
2646         case IPV6_NEXTHOP:
2647                 GET_PKTOPT_SOCKADDR(ip6po_nexthop);
2648                 break;
2649         case IPV6_USE_MIN_MTU:
2650                 if (pktopt)
2651                         defminmtu = pktopt->ip6po_minmtu;
2652                 optdata = (void *)&defminmtu;
2653                 optdatalen = sizeof(int);
2654                 break;
2655         case IPV6_DONTFRAG:
2656                 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2657                         on = 1;
2658                 else
2659                         on = 0;
2660                 optdata = (void *)&on;
2661                 optdatalen = sizeof(on);
2662                 break;
2663         case IPV6_PREFER_TEMPADDR:
2664                 if (pktopt)
2665                         defpreftemp = pktopt->ip6po_prefer_tempaddr;
2666                 optdata = (void *)&defpreftemp;
2667                 optdatalen = sizeof(int);
2668                 break;
2669         default:                /* should not happen */
2670 #ifdef DIAGNOSTIC
2671                 panic("ip6_getpcbopt: unexpected option\n");
2672 #endif
2673                 INP_RUNLOCK(inp);
2674                 return (ENOPROTOOPT);
2675         }
2676         INP_RUNLOCK(inp);
2677
2678         error = sooptcopyout(sopt, optdata, optdatalen);
2679         if (malloc_optdata)
2680                 free(optdata, M_TEMP);
2681
2682         return (error);
2683 }
2684
2685 void
2686 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2687 {
2688         if (pktopt == NULL)
2689                 return;
2690
2691         if (optname == -1 || optname == IPV6_PKTINFO) {
2692                 if (pktopt->ip6po_pktinfo)
2693                         free(pktopt->ip6po_pktinfo, M_IP6OPT);
2694                 pktopt->ip6po_pktinfo = NULL;
2695         }
2696         if (optname == -1 || optname == IPV6_HOPLIMIT)
2697                 pktopt->ip6po_hlim = -1;
2698         if (optname == -1 || optname == IPV6_TCLASS)
2699                 pktopt->ip6po_tclass = -1;
2700         if (optname == -1 || optname == IPV6_NEXTHOP) {
2701                 if (pktopt->ip6po_nextroute.ro_nh) {
2702                         NH_FREE(pktopt->ip6po_nextroute.ro_nh);
2703                         pktopt->ip6po_nextroute.ro_nh = NULL;
2704                 }
2705                 if (pktopt->ip6po_nexthop)
2706                         free(pktopt->ip6po_nexthop, M_IP6OPT);
2707                 pktopt->ip6po_nexthop = NULL;
2708         }
2709         if (optname == -1 || optname == IPV6_HOPOPTS) {
2710                 if (pktopt->ip6po_hbh)
2711                         free(pktopt->ip6po_hbh, M_IP6OPT);
2712                 pktopt->ip6po_hbh = NULL;
2713         }
2714         if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2715                 if (pktopt->ip6po_dest1)
2716                         free(pktopt->ip6po_dest1, M_IP6OPT);
2717                 pktopt->ip6po_dest1 = NULL;
2718         }
2719         if (optname == -1 || optname == IPV6_RTHDR) {
2720                 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2721                         free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2722                 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2723                 if (pktopt->ip6po_route.ro_nh) {
2724                         NH_FREE(pktopt->ip6po_route.ro_nh);
2725                         pktopt->ip6po_route.ro_nh = NULL;
2726                 }
2727         }
2728         if (optname == -1 || optname == IPV6_DSTOPTS) {
2729                 if (pktopt->ip6po_dest2)
2730                         free(pktopt->ip6po_dest2, M_IP6OPT);
2731                 pktopt->ip6po_dest2 = NULL;
2732         }
2733 }
2734
2735 #define PKTOPT_EXTHDRCPY(type) \
2736 do {\
2737         if (src->type) {\
2738                 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2739                 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2740                 if (dst->type == NULL)\
2741                         goto bad;\
2742                 bcopy(src->type, dst->type, hlen);\
2743         }\
2744 } while (/*CONSTCOND*/ 0)
2745
2746 static int
2747 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2748 {
2749         if (dst == NULL || src == NULL)  {
2750                 printf("ip6_clearpktopts: invalid argument\n");
2751                 return (EINVAL);
2752         }
2753
2754         dst->ip6po_hlim = src->ip6po_hlim;
2755         dst->ip6po_tclass = src->ip6po_tclass;
2756         dst->ip6po_flags = src->ip6po_flags;
2757         dst->ip6po_minmtu = src->ip6po_minmtu;
2758         dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2759         if (src->ip6po_pktinfo) {
2760                 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2761                     M_IP6OPT, canwait);
2762                 if (dst->ip6po_pktinfo == NULL)
2763                         goto bad;
2764                 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2765         }
2766         if (src->ip6po_nexthop) {
2767                 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2768                     M_IP6OPT, canwait);
2769                 if (dst->ip6po_nexthop == NULL)
2770                         goto bad;
2771                 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2772                     src->ip6po_nexthop->sa_len);
2773         }
2774         PKTOPT_EXTHDRCPY(ip6po_hbh);
2775         PKTOPT_EXTHDRCPY(ip6po_dest1);
2776         PKTOPT_EXTHDRCPY(ip6po_dest2);
2777         PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2778         return (0);
2779
2780   bad:
2781         ip6_clearpktopts(dst, -1);
2782         return (ENOBUFS);
2783 }
2784 #undef PKTOPT_EXTHDRCPY
2785
2786 struct ip6_pktopts *
2787 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2788 {
2789         int error;
2790         struct ip6_pktopts *dst;
2791
2792         dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2793         if (dst == NULL)
2794                 return (NULL);
2795         ip6_initpktopts(dst);
2796
2797         if ((error = copypktopts(dst, src, canwait)) != 0) {
2798                 free(dst, M_IP6OPT);
2799                 return (NULL);
2800         }
2801
2802         return (dst);
2803 }
2804
2805 void
2806 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2807 {
2808         if (pktopt == NULL)
2809                 return;
2810
2811         ip6_clearpktopts(pktopt, -1);
2812
2813         free(pktopt, M_IP6OPT);
2814 }
2815
2816 /*
2817  * Set IPv6 outgoing packet options based on advanced API.
2818  */
2819 int
2820 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2821     struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2822 {
2823         struct cmsghdr *cm = NULL;
2824
2825         if (control == NULL || opt == NULL)
2826                 return (EINVAL);
2827
2828         ip6_initpktopts(opt);
2829         if (stickyopt) {
2830                 int error;
2831
2832                 /*
2833                  * If stickyopt is provided, make a local copy of the options
2834                  * for this particular packet, then override them by ancillary
2835                  * objects.
2836                  * XXX: copypktopts() does not copy the cached route to a next
2837                  * hop (if any).  This is not very good in terms of efficiency,
2838                  * but we can allow this since this option should be rarely
2839                  * used.
2840                  */
2841                 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2842                         return (error);
2843         }
2844
2845         /*
2846          * XXX: Currently, we assume all the optional information is stored
2847          * in a single mbuf.
2848          */
2849         if (control->m_next)
2850                 return (EINVAL);
2851
2852         for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2853             control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2854                 int error;
2855
2856                 if (control->m_len < CMSG_LEN(0))
2857                         return (EINVAL);
2858
2859                 cm = mtod(control, struct cmsghdr *);
2860                 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2861                         return (EINVAL);
2862                 if (cm->cmsg_level != IPPROTO_IPV6)
2863                         continue;
2864
2865                 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2866                     cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2867                 if (error)
2868                         return (error);
2869         }
2870
2871         return (0);
2872 }
2873
2874 /*
2875  * Set a particular packet option, as a sticky option or an ancillary data
2876  * item.  "len" can be 0 only when it's a sticky option.
2877  * We have 4 cases of combination of "sticky" and "cmsg":
2878  * "sticky=0, cmsg=0": impossible
2879  * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2880  * "sticky=1, cmsg=0": RFC3542 socket option
2881  * "sticky=1, cmsg=1": RFC2292 socket option
2882  */
2883 static int
2884 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2885     struct ucred *cred, int sticky, int cmsg, int uproto)
2886 {
2887         int minmtupolicy, preftemp;
2888         int error;
2889
2890         if (!sticky && !cmsg) {
2891 #ifdef DIAGNOSTIC
2892                 printf("ip6_setpktopt: impossible case\n");
2893 #endif
2894                 return (EINVAL);
2895         }
2896
2897         /*
2898          * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2899          * not be specified in the context of RFC3542.  Conversely,
2900          * RFC3542 types should not be specified in the context of RFC2292.
2901          */
2902         if (!cmsg) {
2903                 switch (optname) {
2904                 case IPV6_2292PKTINFO:
2905                 case IPV6_2292HOPLIMIT:
2906                 case IPV6_2292NEXTHOP:
2907                 case IPV6_2292HOPOPTS:
2908                 case IPV6_2292DSTOPTS:
2909                 case IPV6_2292RTHDR:
2910                 case IPV6_2292PKTOPTIONS:
2911                         return (ENOPROTOOPT);
2912                 }
2913         }
2914         if (sticky && cmsg) {
2915                 switch (optname) {
2916                 case IPV6_PKTINFO:
2917                 case IPV6_HOPLIMIT:
2918                 case IPV6_NEXTHOP:
2919                 case IPV6_HOPOPTS:
2920                 case IPV6_DSTOPTS:
2921                 case IPV6_RTHDRDSTOPTS:
2922                 case IPV6_RTHDR:
2923                 case IPV6_USE_MIN_MTU:
2924                 case IPV6_DONTFRAG:
2925                 case IPV6_TCLASS:
2926                 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2927                         return (ENOPROTOOPT);
2928                 }
2929         }
2930
2931         switch (optname) {
2932         case IPV6_2292PKTINFO:
2933         case IPV6_PKTINFO:
2934         {
2935                 struct ifnet *ifp = NULL;
2936                 struct in6_pktinfo *pktinfo;
2937
2938                 if (len != sizeof(struct in6_pktinfo))
2939                         return (EINVAL);
2940
2941                 pktinfo = (struct in6_pktinfo *)buf;
2942
2943                 /*
2944                  * An application can clear any sticky IPV6_PKTINFO option by
2945                  * doing a "regular" setsockopt with ipi6_addr being
2946                  * in6addr_any and ipi6_ifindex being zero.
2947                  * [RFC 3542, Section 6]
2948                  */
2949                 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2950                     pktinfo->ipi6_ifindex == 0 &&
2951                     IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2952                         ip6_clearpktopts(opt, optname);
2953                         break;
2954                 }
2955
2956                 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2957                     sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2958                         return (EINVAL);
2959                 }
2960                 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
2961                         return (EINVAL);
2962                 /* validate the interface index if specified. */
2963                 if (pktinfo->ipi6_ifindex > V_if_index)
2964                          return (ENXIO);
2965                 if (pktinfo->ipi6_ifindex) {
2966                         ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2967                         if (ifp == NULL)
2968                                 return (ENXIO);
2969                 }
2970                 if (ifp != NULL && (ifp->if_afdata[AF_INET6] == NULL ||
2971                     (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) != 0))
2972                         return (ENETDOWN);
2973
2974                 if (ifp != NULL &&
2975                     !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2976                         struct in6_ifaddr *ia;
2977
2978                         in6_setscope(&pktinfo->ipi6_addr, ifp, NULL);
2979                         ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr);
2980                         if (ia == NULL)
2981                                 return (EADDRNOTAVAIL);
2982                         ifa_free(&ia->ia_ifa);
2983                 }
2984                 /*
2985                  * We store the address anyway, and let in6_selectsrc()
2986                  * validate the specified address.  This is because ipi6_addr
2987                  * may not have enough information about its scope zone, and
2988                  * we may need additional information (such as outgoing
2989                  * interface or the scope zone of a destination address) to
2990                  * disambiguate the scope.
2991                  * XXX: the delay of the validation may confuse the
2992                  * application when it is used as a sticky option.
2993                  */
2994                 if (opt->ip6po_pktinfo == NULL) {
2995                         opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2996                             M_IP6OPT, M_NOWAIT);
2997                         if (opt->ip6po_pktinfo == NULL)
2998                                 return (ENOBUFS);
2999                 }
3000                 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
3001                 break;
3002         }
3003
3004         case IPV6_2292HOPLIMIT:
3005         case IPV6_HOPLIMIT:
3006         {
3007                 int *hlimp;
3008
3009                 /*
3010                  * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
3011                  * to simplify the ordering among hoplimit options.
3012                  */
3013                 if (optname == IPV6_HOPLIMIT && sticky)
3014                         return (ENOPROTOOPT);
3015
3016                 if (len != sizeof(int))
3017                         return (EINVAL);
3018                 hlimp = (int *)buf;
3019                 if (*hlimp < -1 || *hlimp > 255)
3020                         return (EINVAL);
3021
3022                 opt->ip6po_hlim = *hlimp;
3023                 break;
3024         }
3025
3026         case IPV6_TCLASS:
3027         {
3028                 int tclass;
3029
3030                 if (len != sizeof(int))
3031                         return (EINVAL);
3032                 tclass = *(int *)buf;
3033                 if (tclass < -1 || tclass > 255)
3034                         return (EINVAL);
3035
3036                 opt->ip6po_tclass = tclass;
3037                 break;
3038         }
3039
3040         case IPV6_2292NEXTHOP:
3041         case IPV6_NEXTHOP:
3042                 if (cred != NULL) {
3043                         error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
3044                         if (error)
3045                                 return (error);
3046                 }
3047
3048                 if (len == 0) { /* just remove the option */
3049                         ip6_clearpktopts(opt, IPV6_NEXTHOP);
3050                         break;
3051                 }
3052
3053                 /* check if cmsg_len is large enough for sa_len */
3054                 if (len < sizeof(struct sockaddr) || len < *buf)
3055                         return (EINVAL);
3056
3057                 switch (((struct sockaddr *)buf)->sa_family) {
3058                 case AF_INET6:
3059                 {
3060                         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
3061                         int error;
3062
3063                         if (sa6->sin6_len != sizeof(struct sockaddr_in6))
3064                                 return (EINVAL);
3065
3066                         if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
3067                             IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
3068                                 return (EINVAL);
3069                         }
3070                         if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
3071                             != 0) {
3072                                 return (error);
3073                         }
3074                         break;
3075                 }
3076                 case AF_LINK:   /* should eventually be supported */
3077                 default:
3078                         return (EAFNOSUPPORT);
3079                 }
3080
3081                 /* turn off the previous option, then set the new option. */
3082                 ip6_clearpktopts(opt, IPV6_NEXTHOP);
3083                 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
3084                 if (opt->ip6po_nexthop == NULL)
3085                         return (ENOBUFS);
3086                 bcopy(buf, opt->ip6po_nexthop, *buf);
3087                 break;
3088
3089         case IPV6_2292HOPOPTS:
3090         case IPV6_HOPOPTS:
3091         {
3092                 struct ip6_hbh *hbh;
3093                 int hbhlen;
3094
3095                 /*
3096                  * XXX: We don't allow a non-privileged user to set ANY HbH
3097                  * options, since per-option restriction has too much
3098                  * overhead.
3099                  */
3100                 if (cred != NULL) {
3101                         error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
3102                         if (error)
3103                                 return (error);
3104                 }
3105
3106                 if (len == 0) {
3107                         ip6_clearpktopts(opt, IPV6_HOPOPTS);
3108                         break;  /* just remove the option */
3109                 }
3110
3111                 /* message length validation */
3112                 if (len < sizeof(struct ip6_hbh))
3113                         return (EINVAL);
3114                 hbh = (struct ip6_hbh *)buf;
3115                 hbhlen = (hbh->ip6h_len + 1) << 3;
3116                 if (len != hbhlen)
3117                         return (EINVAL);
3118
3119                 /* turn off the previous option, then set the new option. */
3120                 ip6_clearpktopts(opt, IPV6_HOPOPTS);
3121                 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
3122                 if (opt->ip6po_hbh == NULL)
3123                         return (ENOBUFS);
3124                 bcopy(hbh, opt->ip6po_hbh, hbhlen);
3125
3126                 break;
3127         }
3128
3129         case IPV6_2292DSTOPTS:
3130         case IPV6_DSTOPTS:
3131         case IPV6_RTHDRDSTOPTS:
3132         {
3133                 struct ip6_dest *dest, **newdest = NULL;
3134                 int destlen;
3135
3136                 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
3137                         error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
3138                         if (error)
3139                                 return (error);
3140                 }
3141
3142                 if (len == 0) {
3143                         ip6_clearpktopts(opt, optname);
3144                         break;  /* just remove the option */
3145                 }
3146
3147                 /* message length validation */
3148                 if (len < sizeof(struct ip6_dest))
3149                         return (EINVAL);
3150                 dest = (struct ip6_dest *)buf;
3151                 destlen = (dest->ip6d_len + 1) << 3;
3152                 if (len != destlen)
3153                         return (EINVAL);
3154
3155                 /*
3156                  * Determine the position that the destination options header
3157                  * should be inserted; before or after the routing header.
3158                  */
3159                 switch (optname) {
3160                 case IPV6_2292DSTOPTS:
3161                         /*
3162                          * The old advacned API is ambiguous on this point.
3163                          * Our approach is to determine the position based
3164                          * according to the existence of a routing header.
3165                          * Note, however, that this depends on the order of the
3166                          * extension headers in the ancillary data; the 1st
3167                          * part of the destination options header must appear
3168                          * before the routing header in the ancillary data,
3169                          * too.
3170                          * RFC3542 solved the ambiguity by introducing
3171                          * separate ancillary data or option types.
3172                          */
3173                         if (opt->ip6po_rthdr == NULL)
3174                                 newdest = &opt->ip6po_dest1;
3175                         else
3176                                 newdest = &opt->ip6po_dest2;
3177                         break;
3178                 case IPV6_RTHDRDSTOPTS:
3179                         newdest = &opt->ip6po_dest1;
3180                         break;
3181                 case IPV6_DSTOPTS:
3182                         newdest = &opt->ip6po_dest2;
3183                         break;
3184                 }
3185
3186                 /* turn off the previous option, then set the new option. */
3187                 ip6_clearpktopts(opt, optname);
3188                 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
3189                 if (*newdest == NULL)
3190                         return (ENOBUFS);
3191                 bcopy(dest, *newdest, destlen);
3192
3193                 break;
3194         }
3195
3196         case IPV6_2292RTHDR:
3197         case IPV6_RTHDR:
3198         {
3199                 struct ip6_rthdr *rth;
3200                 int rthlen;
3201
3202                 if (len == 0) {
3203                         ip6_clearpktopts(opt, IPV6_RTHDR);
3204                         break;  /* just remove the option */
3205                 }
3206
3207                 /* message length validation */
3208                 if (len < sizeof(struct ip6_rthdr))
3209                         return (EINVAL);
3210                 rth = (struct ip6_rthdr *)buf;
3211                 rthlen = (rth->ip6r_len + 1) << 3;
3212                 if (len != rthlen)
3213                         return (EINVAL);
3214
3215                 switch (rth->ip6r_type) {
3216                 case IPV6_RTHDR_TYPE_0:
3217                         if (rth->ip6r_len == 0) /* must contain one addr */
3218                                 return (EINVAL);
3219                         if (rth->ip6r_len % 2) /* length must be even */
3220                                 return (EINVAL);
3221                         if (rth->ip6r_len / 2 != rth->ip6r_segleft)
3222                                 return (EINVAL);
3223                         break;
3224                 default:
3225                         return (EINVAL);        /* not supported */
3226                 }
3227
3228                 /* turn off the previous option */
3229                 ip6_clearpktopts(opt, IPV6_RTHDR);
3230                 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
3231                 if (opt->ip6po_rthdr == NULL)
3232                         return (ENOBUFS);
3233                 bcopy(rth, opt->ip6po_rthdr, rthlen);
3234
3235                 break;
3236         }
3237
3238         case IPV6_USE_MIN_MTU:
3239                 if (len != sizeof(int))
3240                         return (EINVAL);
3241                 minmtupolicy = *(int *)buf;
3242                 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
3243                     minmtupolicy != IP6PO_MINMTU_DISABLE &&
3244                     minmtupolicy != IP6PO_MINMTU_ALL) {
3245                         return (EINVAL);
3246                 }
3247                 opt->ip6po_minmtu = minmtupolicy;
3248                 break;
3249
3250         case IPV6_DONTFRAG:
3251                 if (len != sizeof(int))
3252                         return (EINVAL);
3253
3254                 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
3255                         /*
3256                          * we ignore this option for TCP sockets.
3257                          * (RFC3542 leaves this case unspecified.)
3258                          */
3259                         opt->ip6po_flags &= ~IP6PO_DONTFRAG;
3260                 } else
3261                         opt->ip6po_flags |= IP6PO_DONTFRAG;
3262                 break;
3263
3264         case IPV6_PREFER_TEMPADDR:
3265                 if (len != sizeof(int))
3266                         return (EINVAL);
3267                 preftemp = *(int *)buf;
3268                 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
3269                     preftemp != IP6PO_TEMPADDR_NOTPREFER &&
3270                     preftemp != IP6PO_TEMPADDR_PREFER) {
3271                         return (EINVAL);
3272                 }
3273                 opt->ip6po_prefer_tempaddr = preftemp;
3274                 break;
3275
3276         default:
3277                 return (ENOPROTOOPT);
3278         } /* end of switch */
3279
3280         return (0);
3281 }
3282
3283 /*
3284  * Routine called from ip6_output() to loop back a copy of an IP6 multicast
3285  * packet to the input queue of a specified interface.  Note that this
3286  * calls the output routine of the loopback "driver", but with an interface
3287  * pointer that might NOT be &loif -- easier than replicating that code here.
3288  */
3289 void
3290 ip6_mloopback(struct ifnet *ifp, struct mbuf *m)
3291 {
3292         struct mbuf *copym;
3293         struct ip6_hdr *ip6;
3294
3295         copym = m_copym(m, 0, M_COPYALL, M_NOWAIT);
3296         if (copym == NULL)
3297                 return;
3298
3299         /*
3300          * Make sure to deep-copy IPv6 header portion in case the data
3301          * is in an mbuf cluster, so that we can safely override the IPv6
3302          * header portion later.
3303          */
3304         if (!M_WRITABLE(copym) ||
3305             copym->m_len < sizeof(struct ip6_hdr)) {
3306                 copym = m_pullup(copym, sizeof(struct ip6_hdr));
3307                 if (copym == NULL)
3308                         return;
3309         }
3310         ip6 = mtod(copym, struct ip6_hdr *);
3311         /*
3312          * clear embedded scope identifiers if necessary.
3313          * in6_clearscope will touch the addresses only when necessary.
3314          */
3315         in6_clearscope(&ip6->ip6_src);
3316         in6_clearscope(&ip6->ip6_dst);
3317         if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
3318                 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 |
3319                     CSUM_PSEUDO_HDR;
3320                 copym->m_pkthdr.csum_data = 0xffff;
3321         }
3322         if_simloop(ifp, copym, AF_INET6, 0);
3323 }
3324
3325 /*
3326  * Chop IPv6 header off from the payload.
3327  */
3328 static int
3329 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
3330 {
3331         struct mbuf *mh;
3332         struct ip6_hdr *ip6;
3333
3334         ip6 = mtod(m, struct ip6_hdr *);
3335         if (m->m_len > sizeof(*ip6)) {
3336                 mh = m_gethdr(M_NOWAIT, MT_DATA);
3337                 if (mh == NULL) {
3338                         m_freem(m);
3339                         return ENOBUFS;
3340                 }
3341                 m_move_pkthdr(mh, m);
3342                 M_ALIGN(mh, sizeof(*ip6));
3343                 m->m_len -= sizeof(*ip6);
3344                 m->m_data += sizeof(*ip6);
3345                 mh->m_next = m;
3346                 m = mh;
3347                 m->m_len = sizeof(*ip6);
3348                 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
3349         }
3350         exthdrs->ip6e_ip6 = m;
3351         return 0;
3352 }
3353
3354 /*
3355  * Compute IPv6 extension header length.
3356  */
3357 int
3358 ip6_optlen(struct inpcb *inp)
3359 {
3360         int len;
3361
3362         if (!inp->in6p_outputopts)
3363                 return 0;
3364
3365         len = 0;
3366 #define elen(x) \
3367     (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3368
3369         len += elen(inp->in6p_outputopts->ip6po_hbh);
3370         if (inp->in6p_outputopts->ip6po_rthdr)
3371                 /* dest1 is valid with rthdr only */
3372                 len += elen(inp->in6p_outputopts->ip6po_dest1);
3373         len += elen(inp->in6p_outputopts->ip6po_rthdr);
3374         len += elen(inp->in6p_outputopts->ip6po_dest2);
3375         return len;
3376 #undef elen
3377 }