sys/netinet6/ip6_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $
  32  */
  33
  34 /*-
  35  * Copyright (c) 1982, 1986, 1988, 1990, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  */
  62
  63 #include <sys/cdefs.h>
  64 #include "opt_inet.h"
  65 #include "opt_inet6.h"
  66 #include "opt_ipsec.h"
  67 #include "opt_kern_tls.h"
  68 #include "opt_ratelimit.h"
  69 #include "opt_route.h"
  70 #include "opt_rss.h"
  71 #include "opt_sctp.h"
  72
  73 #include <sys/param.h>
  74 #include <sys/kernel.h>
  75 #include <sys/ktls.h>
  76 #include <sys/malloc.h>
  77 #include <sys/mbuf.h>
  78 #include <sys/errno.h>
  79 #include <sys/priv.h>
  80 #include <sys/proc.h>
  81 #include <sys/protosw.h>
  82 #include <sys/socket.h>
  83 #include <sys/socketvar.h>
  84 #include <sys/syslog.h>
  85 #include <sys/ucred.h>
  86
  87 #include <machine/in_cksum.h>
  88
  89 #include <net/if.h>
  90 #include <net/if_var.h>
  91 #include <net/if_private.h>
  92 #include <net/if_vlan_var.h>
  93 #include <net/if_llatbl.h>
  94 #include <net/ethernet.h>
  95 #include <net/netisr.h>
  96 #include <net/route.h>
  97 #include <net/route/nhop.h>
  98 #include <net/pfil.h>
  99 #include <net/rss_config.h>
 100 #include <net/vnet.h>
 101
 102 #include <netinet/in.h>
 103 #include <netinet/in_var.h>
 104 #include <netinet/ip_var.h>
 105 #include <netinet6/in6_fib.h>
 106 #include <netinet6/in6_var.h>
 107 #include <netinet/ip6.h>
 108 #include <netinet/icmp6.h>
 109 #include <netinet6/ip6_var.h>
 110 #include <netinet/in_pcb.h>
 111 #include <netinet/tcp_var.h>
 112 #include <netinet6/nd6.h>
 113 #include <netinet6/in6_rss.h>
 114
 115 #include <netipsec/ipsec_support.h>
 116 #if defined(SCTP) || defined(SCTP_SUPPORT)
 117 #include <netinet/sctp.h>
 118 #include <netinet/sctp_crc32.h>
 119 #endif
 120
 121 #include <netinet6/scope6_var.h>
 122
 123 extern int in6_mcast_loop;
 124
 125 struct ip6_exthdrs {
 126         struct mbuf *ip6e_ip6;
 127         struct mbuf *ip6e_hbh;
 128         struct mbuf *ip6e_dest1;
 129         struct mbuf *ip6e_rthdr;
 130         struct mbuf *ip6e_dest2;
 131 };
 132
 133 static MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
 134
 135 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
 136                            struct ucred *, int);
 137 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
 138         struct socket *, struct sockopt *);
 139 static int ip6_getpcbopt(struct inpcb *, int, struct sockopt *);
 140 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
 141         struct ucred *, int, int, int);
 142
 143 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
 144 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
 145         struct ip6_frag **);
 146 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
 147 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
 148 static int ip6_getpmtu(struct route_in6 *, int,
 149         struct ifnet *, const struct in6_addr *, u_long *, int *, u_int,
 150         u_int);
 151 static int ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long,
 152         u_long *, int *, u_int);
 153 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *);
 154 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
 155
 156 /*
 157  * Make an extension header from option data.  hp is the source,
 158  * mp is the destination, and _ol is the optlen.
 159  */
 160 #define MAKE_EXTHDR(hp, mp, _ol)                                        \
 161     do {                                                                \
 162         if (hp) {                                                       \
 163                 struct ip6_ext *eh = (struct ip6_ext *)(hp);            \
 164                 error = ip6_copyexthdr((mp), (caddr_t)(hp),             \
 165                     ((eh)->ip6e_len + 1) << 3);                         \
 166                 if (error)                                              \
 167                         goto freehdrs;                                  \
 168                 (_ol) += (*(mp))->m_len;                                \
 169         }                                                               \
 170     } while (/*CONSTCOND*/ 0)
 171
 172 /*
 173  * Form a chain of extension headers.
 174  * m is the extension header mbuf
 175  * mp is the previous mbuf in the chain
 176  * p is the next header
 177  * i is the type of option.
 178  */
 179 #define MAKE_CHAIN(m, mp, p, i)\
 180     do {\
 181         if (m) {\
 182                 if (!hdrsplit) \
 183                         panic("%s:%d: assumption failed: "\
 184                             "hdr not split: hdrsplit %d exthdrs %p",\
 185                             __func__, __LINE__, hdrsplit, &exthdrs);\
 186                 *mtod((m), u_char *) = *(p);\
 187                 *(p) = (i);\
 188                 p = mtod((m), u_char *);\
 189                 (m)->m_next = (mp)->m_next;\
 190                 (mp)->m_next = (m);\
 191                 (mp) = (m);\
 192         }\
 193     } while (/*CONSTCOND*/ 0)
 194
 195 void
 196 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
 197 {
 198         u_short csum;
 199
 200         csum = in_cksum_skip(m, offset + plen, offset);
 201         if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
 202                 csum = 0xffff;
 203         offset += m->m_pkthdr.csum_data;        /* checksum offset */
 204
 205         if (offset + sizeof(csum) > m->m_len)
 206                 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
 207         else
 208                 *(u_short *)mtodo(m, offset) = csum;
 209 }
 210
 211 static void
 212 ip6_output_delayed_csum(struct mbuf *m, struct ifnet *ifp, int csum_flags,
 213     int plen, int optlen)
 214 {
 215
 216         KASSERT((plen >= optlen), ("%s:%d: plen %d < optlen %d, m %p, ifp %p "
 217             "csum_flags %#x",
 218             __func__, __LINE__, plen, optlen, m, ifp, csum_flags));
 219
 220         if (csum_flags & CSUM_DELAY_DATA_IPV6) {
 221                 in6_delayed_cksum(m, plen - optlen,
 222                     sizeof(struct ip6_hdr) + optlen);
 223                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
 224         }
 225 #if defined(SCTP) || defined(SCTP_SUPPORT)
 226         if (csum_flags & CSUM_SCTP_IPV6) {
 227                 sctp_delayed_cksum(m, sizeof(struct ip6_hdr) + optlen);
 228                 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
 229         }
 230 #endif
 231 }
 232
 233 int
 234 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto,
 235     int fraglen , uint32_t id)
 236 {
 237         struct mbuf *m, **mnext, *m_frgpart;
 238         struct ip6_hdr *ip6, *mhip6;
 239         struct ip6_frag *ip6f;
 240         int off;
 241         int error;
 242         int tlen = m0->m_pkthdr.len;
 243
 244         KASSERT((fraglen % 8 == 0), ("Fragment length must be a multiple of 8"));
 245
 246         m = m0;
 247         ip6 = mtod(m, struct ip6_hdr *);
 248         mnext = &m->m_nextpkt;
 249
 250         for (off = hlen; off < tlen; off += fraglen) {
 251                 m = m_gethdr(M_NOWAIT, MT_DATA);
 252                 if (!m) {
 253                         IP6STAT_INC(ip6s_odropped);
 254                         return (ENOBUFS);
 255                 }
 256
 257                 /*
 258                  * Make sure the complete packet header gets copied
 259                  * from the originating mbuf to the newly created
 260                  * mbuf. This also ensures that existing firewall
 261                  * classification(s), VLAN tags and so on get copied
 262                  * to the resulting fragmented packet(s):
 263                  */
 264                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
 265                         m_free(m);
 266                         IP6STAT_INC(ip6s_odropped);
 267                         return (ENOBUFS);
 268                 }
 269
 270                 *mnext = m;
 271                 mnext = &m->m_nextpkt;
 272                 m->m_data += max_linkhdr;
 273                 mhip6 = mtod(m, struct ip6_hdr *);
 274                 *mhip6 = *ip6;
 275                 m->m_len = sizeof(*mhip6);
 276                 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
 277                 if (error) {
 278                         IP6STAT_INC(ip6s_odropped);
 279                         return (error);
 280                 }
 281                 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
 282                 if (off + fraglen >= tlen)
 283                         fraglen = tlen - off;
 284                 else
 285                         ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
 286                 mhip6->ip6_plen = htons((u_short)(fraglen + hlen +
 287                     sizeof(*ip6f) - sizeof(struct ip6_hdr)));
 288                 if ((m_frgpart = m_copym(m0, off, fraglen, M_NOWAIT)) == NULL) {
 289                         IP6STAT_INC(ip6s_odropped);
 290                         return (ENOBUFS);
 291                 }
 292                 m_cat(m, m_frgpart);
 293                 m->m_pkthdr.len = fraglen + hlen + sizeof(*ip6f);
 294                 ip6f->ip6f_reserved = 0;
 295                 ip6f->ip6f_ident = id;
 296                 ip6f->ip6f_nxt = nextproto;
 297                 IP6STAT_INC(ip6s_ofragments);
 298                 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
 299         }
 300
 301         return (0);
 302 }
 303
 304 static int
 305 ip6_output_send(struct inpcb *inp, struct ifnet *ifp, struct ifnet *origifp,
 306     struct mbuf *m, struct sockaddr_in6 *dst, struct route_in6 *ro,
 307     bool stamp_tag)
 308 {
 309 #ifdef KERN_TLS
 310         struct ktls_session *tls = NULL;
 311 #endif
 312         struct m_snd_tag *mst;
 313         int error;
 314
 315         MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
 316         mst = NULL;
 317
 318 #ifdef KERN_TLS
 319         /*
 320          * If this is an unencrypted TLS record, save a reference to
 321          * the record.  This local reference is used to call
 322          * ktls_output_eagain after the mbuf has been freed (thus
 323          * dropping the mbuf's reference) in if_output.
 324          */
 325         if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) {
 326                 tls = ktls_hold(m->m_next->m_epg_tls);
 327                 mst = tls->snd_tag;
 328
 329                 /*
 330                  * If a TLS session doesn't have a valid tag, it must
 331                  * have had an earlier ifp mismatch, so drop this
 332                  * packet.
 333                  */
 334                 if (mst == NULL) {
 335                         m_freem(m);
 336                         error = EAGAIN;
 337                         goto done;
 338                 }
 339                 /*
 340                  * Always stamp tags that include NIC ktls.
 341                  */
 342                 stamp_tag = true;
 343         }
 344 #endif
 345 #ifdef RATELIMIT
 346         if (inp != NULL && mst == NULL) {
 347                 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 ||
 348                     (inp->inp_snd_tag != NULL &&
 349                     inp->inp_snd_tag->ifp != ifp))
 350                         in_pcboutput_txrtlmt(inp, ifp, m);
 351
 352                 if (inp->inp_snd_tag != NULL)
 353                         mst = inp->inp_snd_tag;
 354         }
 355 #endif
 356         if (stamp_tag && mst != NULL) {
 357                 KASSERT(m->m_pkthdr.rcvif == NULL,
 358                     ("trying to add a send tag to a forwarded packet"));
 359                 if (mst->ifp != ifp) {
 360                         m_freem(m);
 361                         error = EAGAIN;
 362                         goto done;
 363                 }
 364
 365                 /* stamp send tag on mbuf */
 366                 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst);
 367                 m->m_pkthdr.csum_flags |= CSUM_SND_TAG;
 368         }
 369
 370         error = nd6_output_ifp(ifp, origifp, m, dst, (struct route *)ro);
 371
 372 done:
 373         /* Check for route change invalidating send tags. */
 374 #ifdef KERN_TLS
 375         if (tls != NULL) {
 376                 if (error == EAGAIN)
 377                         error = ktls_output_eagain(inp, tls);
 378                 ktls_free(tls);
 379         }
 380 #endif
 381 #ifdef RATELIMIT
 382         if (error == EAGAIN)
 383                 in_pcboutput_eagain(inp);
 384 #endif
 385         return (error);
 386 }
 387
 388 /*
 389  * IP6 output.
 390  * The packet in mbuf chain m contains a skeletal IP6 header (with pri, len,
 391  * nxt, hlim, src, dst).
 392  * This function may modify ver and hlim only.
 393  * The mbuf chain containing the packet will be freed.
 394  * The mbuf opt, if present, will not be freed.
 395  * If route_in6 ro is present and has ro_nh initialized, route lookup would be
 396  * skipped and ro->ro_nh would be used. If ro is present but ro->ro_nh is NULL,
 397  * then result of route lookup is stored in ro->ro_nh.
 398  *
 399  * Type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and nd_ifinfo.linkmtu
 400  * is uint32_t.  So we use u_long to hold largest one, which is rt_mtu.
 401  *
 402  * ifpp - XXX: just for statistics
 403  */
 404 int
 405 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
 406     struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
 407     struct ifnet **ifpp, struct inpcb *inp)
 408 {
 409         struct ip6_hdr *ip6;
 410         struct ifnet *ifp, *origifp;
 411         struct mbuf *m = m0;
 412         struct mbuf *mprev;
 413         struct route_in6 *ro_pmtu;
 414         struct nhop_object *nh;
 415         struct sockaddr_in6 *dst, sin6, src_sa, dst_sa;
 416         struct in6_addr odst;
 417         u_char *nexthdrp;
 418         int tlen, len;
 419         int error = 0;
 420         int vlan_pcp = -1;
 421         struct in6_ifaddr *ia = NULL;
 422         u_long mtu;
 423         int alwaysfrag, dontfrag;
 424         u_int32_t optlen, plen = 0, unfragpartlen;
 425         struct ip6_exthdrs exthdrs;
 426         struct in6_addr src0, dst0;
 427         u_int32_t zone;
 428         bool hdrsplit;
 429         int sw_csum, tso;
 430         int needfiblookup;
 431         uint32_t fibnum;
 432         struct m_tag *fwd_tag = NULL;
 433         uint32_t id;
 434
 435         NET_EPOCH_ASSERT();
 436
 437         if (inp != NULL) {
 438                 INP_LOCK_ASSERT(inp);
 439                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 440                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 441                         /* Unconditionally set flowid. */
 442                         m->m_pkthdr.flowid = inp->inp_flowid;
 443                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 444                 }
 445                 if ((inp->inp_flags2 & INP_2PCP_SET) != 0)
 446                         vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >>
 447                             INP_2PCP_SHIFT;
 448 #ifdef NUMA
 449                 m->m_pkthdr.numa_domain = inp->inp_numa_domain;
 450 #endif
 451         }
 452
 453 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 454         /*
 455          * IPSec checking which handles several cases.
 456          * FAST IPSEC: We re-injected the packet.
 457          * XXX: need scope argument.
 458          */
 459         if (IPSEC_ENABLED(ipv6)) {
 460                 m = mb_unmapped_to_ext(m);
 461                 if (m == NULL) {
 462                         IP6STAT_INC(ip6s_odropped);
 463                         error = ENOBUFS;
 464                         goto bad;
 465                 }
 466                 if ((error = IPSEC_OUTPUT(ipv6, m, inp)) != 0) {
 467                         if (error == EINPROGRESS)
 468                                 error = 0;
 469                         goto done;
 470                 }
 471         }
 472 #endif /* IPSEC */
 473
 474         /* Source address validation. */
 475         ip6 = mtod(m, struct ip6_hdr *);
 476         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
 477             (flags & IPV6_UNSPECSRC) == 0) {
 478                 error = EOPNOTSUPP;
 479                 IP6STAT_INC(ip6s_badscope);
 480                 goto bad;
 481         }
 482         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
 483                 error = EOPNOTSUPP;
 484                 IP6STAT_INC(ip6s_badscope);
 485                 goto bad;
 486         }
 487
 488         /*
 489          * If we are given packet options to add extension headers prepare them.
 490          * Calculate the total length of the extension header chain.
 491          * Keep the length of the unfragmentable part for fragmentation.
 492          */
 493         bzero(&exthdrs, sizeof(exthdrs));
 494         optlen = 0;
 495         unfragpartlen = sizeof(struct ip6_hdr);
 496         if (opt) {
 497                 /* Hop-by-Hop options header. */
 498                 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh, optlen);
 499
 500                 /* Destination options header (1st part). */
 501                 if (opt->ip6po_rthdr) {
 502 #ifndef RTHDR_SUPPORT_IMPLEMENTED
 503                         /*
 504                          * If there is a routing header, discard the packet
 505                          * right away here. RH0/1 are obsolete and we do not
 506                          * currently support RH2/3/4.
 507                          * People trying to use RH253/254 may want to disable
 508                          * this check.
 509                          * The moment we do support any routing header (again)
 510                          * this block should check the routing type more
 511                          * selectively.
 512                          */
 513                         error = EINVAL;
 514                         goto bad;
 515 #endif
 516
 517                         /*
 518                          * Destination options header (1st part).
 519                          * This only makes sense with a routing header.
 520                          * See Section 9.2 of RFC 3542.
 521                          * Disabling this part just for MIP6 convenience is
 522                          * a bad idea.  We need to think carefully about a
 523                          * way to make the advanced API coexist with MIP6
 524                          * options, which might automatically be inserted in
 525                          * the kernel.
 526                          */
 527                         MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1,
 528                             optlen);
 529                 }
 530                 /* Routing header. */
 531                 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr, optlen);
 532
 533                 unfragpartlen += optlen;
 534
 535                 /*
 536                  * NOTE: we don't add AH/ESP length here (done in
 537                  * ip6_ipsec_output()).
 538                  */
 539
 540                 /* Destination options header (2nd part). */
 541                 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2, optlen);
 542         }
 543
 544         /*
 545          * If there is at least one extension header,
 546          * separate IP6 header from the payload.
 547          */
 548         hdrsplit = false;
 549         if (optlen) {
 550                 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
 551                         m = NULL;
 552                         goto freehdrs;
 553                 }
 554                 m = exthdrs.ip6e_ip6;
 555                 ip6 = mtod(m, struct ip6_hdr *);
 556                 hdrsplit = true;
 557         }
 558
 559         /* Adjust mbuf packet header length. */
 560         m->m_pkthdr.len += optlen;
 561         plen = m->m_pkthdr.len - sizeof(*ip6);
 562
 563         /* If this is a jumbo payload, insert a jumbo payload option. */
 564         if (plen > IPV6_MAXPACKET) {
 565                 if (!hdrsplit) {
 566                         if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
 567                                 m = NULL;
 568                                 goto freehdrs;
 569                         }
 570                         m = exthdrs.ip6e_ip6;
 571                         ip6 = mtod(m, struct ip6_hdr *);
 572                         hdrsplit = true;
 573                 }
 574                 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
 575                         goto freehdrs;
 576                 ip6->ip6_plen = 0;
 577         } else
 578                 ip6->ip6_plen = htons(plen);
 579         nexthdrp = &ip6->ip6_nxt;
 580
 581         if (optlen) {
 582                 /*
 583                  * Concatenate headers and fill in next header fields.
 584                  * Here we have, on "m"
 585                  *      IPv6 payload
 586                  * and we insert headers accordingly.
 587                  * Finally, we should be getting:
 588                  *      IPv6 hbh dest1 rthdr ah* [esp* dest2 payload].
 589                  *
 590                  * During the header composing process "m" points to IPv6
 591                  * header.  "mprev" points to an extension header prior to esp.
 592                  */
 593                 mprev = m;
 594
 595                 /*
 596                  * We treat dest2 specially.  This makes IPsec processing
 597                  * much easier.  The goal here is to make mprev point the
 598                  * mbuf prior to dest2.
 599                  *
 600                  * Result: IPv6 dest2 payload.
 601                  * m and mprev will point to IPv6 header.
 602                  */
 603                 if (exthdrs.ip6e_dest2) {
 604                         if (!hdrsplit)
 605                                 panic("%s:%d: assumption failed: "
 606                                     "hdr not split: hdrsplit %d exthdrs %p",
 607                                     __func__, __LINE__, hdrsplit, &exthdrs);
 608                         exthdrs.ip6e_dest2->m_next = m->m_next;
 609                         m->m_next = exthdrs.ip6e_dest2;
 610                         *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
 611                         ip6->ip6_nxt = IPPROTO_DSTOPTS;
 612                 }
 613
 614                 /*
 615                  * Result: IPv6 hbh dest1 rthdr dest2 payload.
 616                  * m will point to IPv6 header.  mprev will point to the
 617                  * extension header prior to dest2 (rthdr in the above case).
 618                  */
 619                 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
 620                 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
 621                            IPPROTO_DSTOPTS);
 622                 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
 623                            IPPROTO_ROUTING);
 624         }
 625
 626         IP6STAT_INC(ip6s_localout);
 627
 628         /* Route packet. */
 629         ro_pmtu = ro;
 630         if (opt && opt->ip6po_rthdr)
 631                 ro = &opt->ip6po_route;
 632         if (ro != NULL)
 633                 dst = (struct sockaddr_in6 *)&ro->ro_dst;
 634         else
 635                 dst = &sin6;
 636         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 637
 638 again:
 639         /*
 640          * If specified, try to fill in the traffic class field.
 641          * Do not override if a non-zero value is already set.
 642          * We check the diffserv field and the ECN field separately.
 643          */
 644         if (opt && opt->ip6po_tclass >= 0) {
 645                 int mask = 0;
 646
 647                 if (IPV6_DSCP(ip6) == 0)
 648                         mask |= 0xfc;
 649                 if (IPV6_ECN(ip6) == 0)
 650                         mask |= 0x03;
 651                 if (mask != 0)
 652                         ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
 653         }
 654
 655         /* Fill in or override the hop limit field, if necessary. */
 656         if (opt && opt->ip6po_hlim != -1)
 657                 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
 658         else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 659                 if (im6o != NULL)
 660                         ip6->ip6_hlim = im6o->im6o_multicast_hlim;
 661                 else
 662                         ip6->ip6_hlim = V_ip6_defmcasthlim;
 663         }
 664
 665         if (ro == NULL || ro->ro_nh == NULL) {
 666                 bzero(dst, sizeof(*dst));
 667                 dst->sin6_family = AF_INET6;
 668                 dst->sin6_len = sizeof(*dst);
 669                 dst->sin6_addr = ip6->ip6_dst;
 670         }
 671         /*
 672          * Validate route against routing table changes.
 673          * Make sure that the address family is set in route.
 674          */
 675         nh = NULL;
 676         ifp = NULL;
 677         mtu = 0;
 678         if (ro != NULL) {
 679                 if (ro->ro_nh != NULL && inp != NULL) {
 680                         ro->ro_dst.sin6_family = AF_INET6; /* XXX KASSERT? */
 681                         NH_VALIDATE((struct route *)ro, &inp->inp_rt_cookie,
 682                             fibnum);
 683                 }
 684                 if (ro->ro_nh != NULL && fwd_tag == NULL &&
 685                     (!NH_IS_VALID(ro->ro_nh) ||
 686                     ro->ro_dst.sin6_family != AF_INET6 ||
 687                     !IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)))
 688                         RO_INVALIDATE_CACHE(ro);
 689
 690                 if (ro->ro_nh != NULL && fwd_tag == NULL &&
 691                     ro->ro_dst.sin6_family == AF_INET6 &&
 692                     IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) {
 693                         /* Nexthop is valid and contains valid ifp */
 694                         nh = ro->ro_nh;
 695                 } else {
 696                         if (ro->ro_lle)
 697                                 LLE_FREE(ro->ro_lle);   /* zeros ro_lle */
 698                         ro->ro_lle = NULL;
 699                         if (fwd_tag == NULL) {
 700                                 bzero(&dst_sa, sizeof(dst_sa));
 701                                 dst_sa.sin6_family = AF_INET6;
 702                                 dst_sa.sin6_len = sizeof(dst_sa);
 703                                 dst_sa.sin6_addr = ip6->ip6_dst;
 704                         }
 705                         error = in6_selectroute(&dst_sa, opt, im6o, ro, &ifp,
 706                             &nh, fibnum, m->m_pkthdr.flowid);
 707                         if (error != 0) {
 708                                 IP6STAT_INC(ip6s_noroute);
 709                                 if (ifp != NULL)
 710                                         in6_ifstat_inc(ifp, ifs6_out_discard);
 711                                 goto bad;
 712                         }
 713                         /*
 714                          * At this point at least @ifp is not NULL
 715                          * Can be the case when dst is multicast, link-local or
 716                          * interface is explicitly specificed by the caller.
 717                          */
 718                 }
 719                 if (nh == NULL) {
 720                         /*
 721                          * If in6_selectroute() does not return a nexthop
 722                          * dst may not have been updated.
 723                          */
 724                         *dst = dst_sa;  /* XXX */
 725                         origifp = ifp;
 726                         mtu = ifp->if_mtu;
 727                 } else {
 728                         ifp = nh->nh_ifp;
 729                         origifp = nh->nh_aifp;
 730                         ia = (struct in6_ifaddr *)(nh->nh_ifa);
 731                         counter_u64_add(nh->nh_pksent, 1);
 732                 }
 733         } else {
 734                 struct nhop_object *nh;
 735                 struct in6_addr kdst;
 736                 uint32_t scopeid;
 737
 738                 if (fwd_tag == NULL) {
 739                         bzero(&dst_sa, sizeof(dst_sa));
 740                         dst_sa.sin6_family = AF_INET6;
 741                         dst_sa.sin6_len = sizeof(dst_sa);
 742                         dst_sa.sin6_addr = ip6->ip6_dst;
 743                 }
 744
 745                 if (IN6_IS_ADDR_MULTICAST(&dst_sa.sin6_addr) &&
 746                     im6o != NULL &&
 747                     (ifp = im6o->im6o_multicast_ifp) != NULL) {
 748                         /* We do not need a route lookup. */
 749                         *dst = dst_sa;  /* XXX */
 750                         origifp = ifp;
 751                         goto nonh6lookup;
 752                 }
 753
 754                 in6_splitscope(&dst_sa.sin6_addr, &kdst, &scopeid);
 755
 756                 if (IN6_IS_ADDR_MC_LINKLOCAL(&dst_sa.sin6_addr) ||
 757                     IN6_IS_ADDR_MC_NODELOCAL(&dst_sa.sin6_addr)) {
 758                         if (scopeid > 0) {
 759                                 ifp = in6_getlinkifnet(scopeid);
 760                                 if (ifp == NULL) {
 761                                         error = EHOSTUNREACH;
 762                                         goto bad;
 763                                 }
 764                                 *dst = dst_sa;  /* XXX */
 765                                 origifp = ifp;
 766                                 goto nonh6lookup;
 767                         }
 768                 }
 769
 770                 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE,
 771                     m->m_pkthdr.flowid);
 772                 if (nh == NULL) {
 773                         IP6STAT_INC(ip6s_noroute);
 774                         /* No ifp in6_ifstat_inc(ifp, ifs6_out_discard); */
 775                         error = EHOSTUNREACH;
 776                         goto bad;
 777                 }
 778
 779                 ifp = nh->nh_ifp;
 780                 origifp = nh->nh_aifp;
 781                 ia = ifatoia6(nh->nh_ifa);
 782                 if (nh->nh_flags & NHF_GATEWAY)
 783                         dst->sin6_addr = nh->gw6_sa.sin6_addr;
 784                 else if (fwd_tag != NULL)
 785                         dst->sin6_addr = dst_sa.sin6_addr;
 786 nonh6lookup:
 787                 ;
 788         }
 789         /*
 790          * At this point ifp MUST be pointing to the valid transmit ifp.
 791          * origifp MUST be valid and pointing to either the same ifp or,
 792          * in case of loopback output, to the interface which ip6_src
 793          * belongs to.
 794          * Examples:
 795          *  fe80::1%em0 -> fe80::2%em0 -> ifp=em0, origifp=em0
 796          *  fe80::1%em0 -> fe80::1%em0 -> ifp=lo0, origifp=em0
 797          *  ::1 -> ::1 -> ifp=lo0, origifp=lo0
 798          *
 799          * mtu can be 0 and will be refined later.
 800          */
 801         KASSERT((ifp != NULL), ("output interface must not be NULL"));
 802         KASSERT((origifp != NULL), ("output address interface must not be NULL"));
 803
 804         if ((flags & IPV6_FORWARDING) == 0) {
 805                 /* XXX: the FORWARDING flag can be set for mrouting. */
 806                 in6_ifstat_inc(ifp, ifs6_out_request);
 807         }
 808
 809         /* Setup data structures for scope ID checks. */
 810         src0 = ip6->ip6_src;
 811         bzero(&src_sa, sizeof(src_sa));
 812         src_sa.sin6_family = AF_INET6;
 813         src_sa.sin6_len = sizeof(src_sa);
 814         src_sa.sin6_addr = ip6->ip6_src;
 815
 816         dst0 = ip6->ip6_dst;
 817         /* Re-initialize to be sure. */
 818         bzero(&dst_sa, sizeof(dst_sa));
 819         dst_sa.sin6_family = AF_INET6;
 820         dst_sa.sin6_len = sizeof(dst_sa);
 821         dst_sa.sin6_addr = ip6->ip6_dst;
 822
 823         /* Check for valid scope ID. */
 824         if (in6_setscope(&src0, origifp, &zone) == 0 &&
 825             sa6_recoverscope(&src_sa) == 0 && zone == src_sa.sin6_scope_id &&
 826             in6_setscope(&dst0, origifp, &zone) == 0 &&
 827             sa6_recoverscope(&dst_sa) == 0 && zone == dst_sa.sin6_scope_id) {
 828                 /*
 829                  * The outgoing interface is in the zone of the source
 830                  * and destination addresses.
 831                  *
 832                  */
 833         } else if ((origifp->if_flags & IFF_LOOPBACK) == 0 ||
 834             sa6_recoverscope(&src_sa) != 0 ||
 835             sa6_recoverscope(&dst_sa) != 0 ||
 836             dst_sa.sin6_scope_id == 0 ||
 837             (src_sa.sin6_scope_id != 0 &&
 838             src_sa.sin6_scope_id != dst_sa.sin6_scope_id) ||
 839             ifnet_byindex(dst_sa.sin6_scope_id) == NULL) {
 840                 /*
 841                  * If the destination network interface is not a
 842                  * loopback interface, or the destination network
 843                  * address has no scope ID, or the source address has
 844                  * a scope ID set which is different from the
 845                  * destination address one, or there is no network
 846                  * interface representing this scope ID, the address
 847                  * pair is considered invalid.
 848                  */
 849                 IP6STAT_INC(ip6s_badscope);
 850                 in6_ifstat_inc(origifp, ifs6_out_discard);
 851                 if (error == 0)
 852                         error = EHOSTUNREACH; /* XXX */
 853                 goto bad;
 854         }
 855         /* All scope ID checks are successful. */
 856
 857         if (nh && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 858                 if (opt && opt->ip6po_nextroute.ro_nh) {
 859                         /*
 860                          * The nexthop is explicitly specified by the
 861                          * application.  We assume the next hop is an IPv6
 862                          * address.
 863                          */
 864                         dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
 865                 }
 866                 else if ((nh->nh_flags & NHF_GATEWAY))
 867                         dst = &nh->gw6_sa;
 868         }
 869
 870         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 871                 m->m_flags &= ~(M_BCAST | M_MCAST); /* Just in case. */
 872         } else {
 873                 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
 874                 in6_ifstat_inc(ifp, ifs6_out_mcast);
 875
 876                 /* Confirm that the outgoing interface supports multicast. */
 877                 if (!(ifp->if_flags & IFF_MULTICAST)) {
 878                         IP6STAT_INC(ip6s_noroute);
 879                         in6_ifstat_inc(ifp, ifs6_out_discard);
 880                         error = ENETUNREACH;
 881                         goto bad;
 882                 }
 883                 if ((im6o == NULL && in6_mcast_loop) ||
 884                     (im6o && im6o->im6o_multicast_loop)) {
 885                         /*
 886                          * Loop back multicast datagram if not expressly
 887                          * forbidden to do so, even if we have not joined
 888                          * the address; protocols will filter it later,
 889                          * thus deferring a hash lookup and lock acquisition
 890                          * at the expense of an m_copym().
 891                          */
 892                         ip6_mloopback(ifp, m);
 893                 } else {
 894                         /*
 895                          * If we are acting as a multicast router, perform
 896                          * multicast forwarding as if the packet had just
 897                          * arrived on the interface to which we are about
 898                          * to send.  The multicast forwarding function
 899                          * recursively calls this function, using the
 900                          * IPV6_FORWARDING flag to prevent infinite recursion.
 901                          *
 902                          * Multicasts that are looped back by ip6_mloopback(),
 903                          * above, will be forwarded by the ip6_input() routine,
 904                          * if necessary.
 905                          */
 906                         if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
 907                                 /*
 908                                  * XXX: ip6_mforward expects that rcvif is NULL
 909                                  * when it is called from the originating path.
 910                                  * However, it may not always be the case.
 911                                  */
 912                                 m->m_pkthdr.rcvif = NULL;
 913                                 if (ip6_mforward(ip6, ifp, m) != 0) {
 914                                         m_freem(m);
 915                                         goto done;
 916                                 }
 917                         }
 918                 }
 919                 /*
 920                  * Multicasts with a hoplimit of zero may be looped back,
 921                  * above, but must not be transmitted on a network.
 922                  * Also, multicasts addressed to the loopback interface
 923                  * are not sent -- the above call to ip6_mloopback() will
 924                  * loop back a copy if this host actually belongs to the
 925                  * destination group on the loopback interface.
 926                  */
 927                 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
 928                     IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
 929                         m_freem(m);
 930                         goto done;
 931                 }
 932         }
 933
 934         /*
 935          * Fill the outgoing inteface to tell the upper layer
 936          * to increment per-interface statistics.
 937          */
 938         if (ifpp)
 939                 *ifpp = ifp;
 940
 941         /* Determine path MTU. */
 942         if ((error = ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst,
 943                     &mtu, &alwaysfrag, fibnum, *nexthdrp)) != 0)
 944                 goto bad;
 945         KASSERT(mtu > 0, ("%s:%d: mtu %ld, ro_pmtu %p ro %p ifp %p "
 946             "alwaysfrag %d fibnum %u\n", __func__, __LINE__, mtu, ro_pmtu, ro,
 947             ifp, alwaysfrag, fibnum));
 948
 949         /*
 950          * The caller of this function may specify to use the minimum MTU
 951          * in some cases.
 952          * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
 953          * setting.  The logic is a bit complicated; by default, unicast
 954          * packets will follow path MTU while multicast packets will be sent at
 955          * the minimum MTU.  If IP6PO_MINMTU_ALL is specified, all packets
 956          * including unicast ones will be sent at the minimum MTU.  Multicast
 957          * packets will always be sent at the minimum MTU unless
 958          * IP6PO_MINMTU_DISABLE is explicitly specified.
 959          * See RFC 3542 for more details.
 960          */
 961         if (mtu > IPV6_MMTU) {
 962                 if ((flags & IPV6_MINMTU))
 963                         mtu = IPV6_MMTU;
 964                 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
 965                         mtu = IPV6_MMTU;
 966                 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
 967                          (opt == NULL ||
 968                           opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
 969                         mtu = IPV6_MMTU;
 970                 }
 971         }
 972
 973         /*
 974          * Clear embedded scope identifiers if necessary.
 975          * in6_clearscope() will touch the addresses only when necessary.
 976          */
 977         in6_clearscope(&ip6->ip6_src);
 978         in6_clearscope(&ip6->ip6_dst);
 979
 980         /*
 981          * If the outgoing packet contains a hop-by-hop options header,
 982          * it must be examined and processed even by the source node.
 983          * (RFC 2460, section 4.)
 984          */
 985         if (exthdrs.ip6e_hbh) {
 986                 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
 987                 u_int32_t dummy; /* XXX unused */
 988                 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
 989
 990 #ifdef DIAGNOSTIC
 991                 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
 992                         panic("ip6e_hbh is not contiguous");
 993 #endif
 994                 /*
 995                  *  XXX: if we have to send an ICMPv6 error to the sender,
 996                  *       we need the M_LOOP flag since icmp6_error() expects
 997                  *       the IPv6 and the hop-by-hop options header are
 998                  *       contiguous unless the flag is set.
 999                  */
1000                 m->m_flags |= M_LOOP;
1001                 m->m_pkthdr.rcvif = ifp;
1002                 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
1003                     ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
1004                     &dummy, &plen) < 0) {
1005                         /* m was already freed at this point. */
1006                         error = EINVAL;/* better error? */
1007                         goto done;
1008                 }
1009                 m->m_flags &= ~M_LOOP; /* XXX */
1010                 m->m_pkthdr.rcvif = NULL;
1011         }
1012
1013         /* Jump over all PFIL processing if hooks are not active. */
1014         if (!PFIL_HOOKED_OUT(V_inet6_pfil_head))
1015                 goto passout;
1016
1017         odst = ip6->ip6_dst;
1018         /* Run through list of hooks for output packets. */
1019         switch (pfil_mbuf_out(V_inet6_pfil_head, &m, ifp, inp)) {
1020         case PFIL_PASS:
1021                 ip6 = mtod(m, struct ip6_hdr *);
1022                 break;
1023         case PFIL_DROPPED:
1024                 error = EACCES;
1025                 /* FALLTHROUGH */
1026         case PFIL_CONSUMED:
1027                 goto done;
1028         }
1029
1030         needfiblookup = 0;
1031         /* See if destination IP address was changed by packet filter. */
1032         if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
1033                 m->m_flags |= M_SKIP_FIREWALL;
1034                 /* If destination is now ourself drop to ip6_input(). */
1035                 if (in6_localip(&ip6->ip6_dst)) {
1036                         m->m_flags |= M_FASTFWD_OURS;
1037                         if (m->m_pkthdr.rcvif == NULL)
1038                                 m->m_pkthdr.rcvif = V_loif;
1039                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1040                                 m->m_pkthdr.csum_flags |=
1041                                     CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
1042                                 m->m_pkthdr.csum_data = 0xffff;
1043                         }
1044 #if defined(SCTP) || defined(SCTP_SUPPORT)
1045                         if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
1046                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
1047 #endif
1048                         error = netisr_queue(NETISR_IPV6, m);
1049                         goto done;
1050                 } else {
1051                         if (ro != NULL)
1052                                 RO_INVALIDATE_CACHE(ro);
1053                         needfiblookup = 1; /* Redo the routing table lookup. */
1054                 }
1055         }
1056         /* See if fib was changed by packet filter. */
1057         if (fibnum != M_GETFIB(m)) {
1058                 m->m_flags |= M_SKIP_FIREWALL;
1059                 fibnum = M_GETFIB(m);
1060                 if (ro != NULL)
1061                         RO_INVALIDATE_CACHE(ro);
1062                 needfiblookup = 1;
1063         }
1064         if (needfiblookup)
1065                 goto again;
1066
1067         /* See if local, if yes, send it to netisr. */
1068         if (m->m_flags & M_FASTFWD_OURS) {
1069                 if (m->m_pkthdr.rcvif == NULL)
1070                         m->m_pkthdr.rcvif = V_loif;
1071                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1072                         m->m_pkthdr.csum_flags |=
1073                             CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
1074                         m->m_pkthdr.csum_data = 0xffff;
1075                 }
1076 #if defined(SCTP) || defined(SCTP_SUPPORT)
1077                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
1078                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
1079 #endif
1080                 error = netisr_queue(NETISR_IPV6, m);
1081                 goto done;
1082         }
1083         /* Or forward to some other address? */
1084         if ((m->m_flags & M_IP6_NEXTHOP) &&
1085             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
1086                 if (ro != NULL)
1087                         dst = (struct sockaddr_in6 *)&ro->ro_dst;
1088                 else
1089                         dst = &sin6;
1090                 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
1091                 m->m_flags |= M_SKIP_FIREWALL;
1092                 m->m_flags &= ~M_IP6_NEXTHOP;
1093                 m_tag_delete(m, fwd_tag);
1094                 goto again;
1095         }
1096
1097 passout:
1098         if (vlan_pcp > -1)
1099                 EVL_APPLY_PRI(m, vlan_pcp);
1100
1101         /* Ensure the packet data is mapped if the interface requires it. */
1102         if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) {
1103                 m = mb_unmapped_to_ext(m);
1104                 if (m == NULL) {
1105                         IP6STAT_INC(ip6s_odropped);
1106                         return (ENOBUFS);
1107                 }
1108         }
1109
1110         /*
1111          * Send the packet to the outgoing interface.
1112          * If necessary, do IPv6 fragmentation before sending.
1113          *
1114          * The logic here is rather complex:
1115          * 1: normal case (dontfrag == 0, alwaysfrag == 0)
1116          * 1-a: send as is if tlen <= path mtu
1117          * 1-b: fragment if tlen > path mtu
1118          *
1119          * 2: if user asks us not to fragment (dontfrag == 1)
1120          * 2-a: send as is if tlen <= interface mtu
1121          * 2-b: error if tlen > interface mtu
1122          *
1123          * 3: if we always need to attach fragment header (alwaysfrag == 1)
1124          *      always fragment
1125          *
1126          * 4: if dontfrag == 1 && alwaysfrag == 1
1127          *      error, as we cannot handle this conflicting request.
1128          */
1129         sw_csum = m->m_pkthdr.csum_flags;
1130         if (!hdrsplit) {
1131                 tso = ((sw_csum & ifp->if_hwassist &
1132                     (CSUM_TSO | CSUM_INNER_TSO)) != 0) ? 1 : 0;
1133                 sw_csum &= ~ifp->if_hwassist;
1134         } else
1135                 tso = 0;
1136         /*
1137          * If we added extension headers, we will not do TSO and calculate the
1138          * checksums ourselves for now.
1139          * XXX-BZ  Need a framework to know when the NIC can handle it, even
1140          * with ext. hdrs.
1141          */
1142         ip6_output_delayed_csum(m, ifp, sw_csum, plen, optlen);
1143         /* XXX-BZ m->m_pkthdr.csum_flags &= ~ifp->if_hwassist; */
1144         tlen = m->m_pkthdr.len;
1145
1146         if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
1147                 dontfrag = 1;
1148         else
1149                 dontfrag = 0;
1150         if (dontfrag && alwaysfrag) {   /* Case 4. */
1151                 /* Conflicting request - can't transmit. */
1152                 error = EMSGSIZE;
1153                 goto bad;
1154         }
1155         if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) {      /* Case 2-b. */
1156                 /*
1157                  * Even if the DONTFRAG option is specified, we cannot send the
1158                  * packet when the data length is larger than the MTU of the
1159                  * outgoing interface.
1160                  * Notify the error by sending IPV6_PATHMTU ancillary data if
1161                  * application wanted to know the MTU value. Also return an
1162                  * error code (this is not described in the API spec).
1163                  */
1164                 if (inp != NULL)
1165                         ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu);
1166                 error = EMSGSIZE;
1167                 goto bad;
1168         }
1169
1170         /* Transmit packet without fragmentation. */
1171         if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* Cases 1-a and 2-a. */
1172                 struct in6_ifaddr *ia6;
1173
1174                 ip6 = mtod(m, struct ip6_hdr *);
1175                 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
1176                 if (ia6) {
1177                         /* Record statistics for this interface address. */
1178                         counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
1179                         counter_u64_add(ia6->ia_ifa.ifa_obytes,
1180                             m->m_pkthdr.len);
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                 ip6_output_delayed_csum(m, ifp, m->m_pkthdr.csum_flags, plen,
1222                     optlen);
1223
1224                 /*
1225                  * Change the next header field of the last header in the
1226                  * unfragmentable part.
1227                  */
1228                 if (exthdrs.ip6e_rthdr) {
1229                         nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
1230                         *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
1231                 } else if (exthdrs.ip6e_dest1) {
1232                         nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
1233                         *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
1234                 } else if (exthdrs.ip6e_hbh) {
1235                         nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
1236                         *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
1237                 } else {
1238                         ip6 = mtod(m, struct ip6_hdr *);
1239                         nextproto = ip6->ip6_nxt;
1240                         ip6->ip6_nxt = IPPROTO_FRAGMENT;
1241                 }
1242
1243                 /*
1244                  * Loop through length of segment after first fragment,
1245                  * make new header and copy data of each part and link onto
1246                  * chain.
1247                  */
1248                 m0 = m;
1249                 id = htonl(ip6_randomid());
1250                 error = ip6_fragment(ifp, m, unfragpartlen, nextproto,len, id);
1251                 if (error != 0)
1252                         goto sendorfree;
1253
1254                 in6_ifstat_inc(ifp, ifs6_out_fragok);
1255         }
1256
1257         /* Remove leading garbage. */
1258 sendorfree:
1259         m = m0->m_nextpkt;
1260         m0->m_nextpkt = 0;
1261         m_freem(m0);
1262         for (; m; m = m0) {
1263                 m0 = m->m_nextpkt;
1264                 m->m_nextpkt = 0;
1265                 if (error == 0) {
1266                         /* Record statistics for this interface address. */
1267                         if (ia) {
1268                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1269                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
1270                                     m->m_pkthdr.len);
1271                         }
1272                         if (vlan_pcp > -1)
1273                                 EVL_APPLY_PRI(m, vlan_pcp);
1274                         error = ip6_output_send(inp, ifp, origifp, m, dst, ro,
1275                             true);
1276                 } else
1277                         m_freem(m);
1278         }
1279
1280         if (error == 0)
1281                 IP6STAT_INC(ip6s_fragmented);
1282
1283 done:
1284         return (error);
1285
1286 freehdrs:
1287         m_freem(exthdrs.ip6e_hbh);      /* m_freem() checks if mbuf is NULL. */
1288         m_freem(exthdrs.ip6e_dest1);
1289         m_freem(exthdrs.ip6e_rthdr);
1290         m_freem(exthdrs.ip6e_dest2);
1291         /* FALLTHROUGH */
1292 bad:
1293         if (m)
1294                 m_freem(m);
1295         goto done;
1296 }
1297
1298 static int
1299 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1300 {
1301         struct mbuf *m;
1302
1303         if (hlen > MCLBYTES)
1304                 return (ENOBUFS); /* XXX */
1305
1306         if (hlen > MLEN)
1307                 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1308         else
1309                 m = m_get(M_NOWAIT, MT_DATA);
1310         if (m == NULL)
1311                 return (ENOBUFS);
1312         m->m_len = hlen;
1313         if (hdr)
1314                 bcopy(hdr, mtod(m, caddr_t), hlen);
1315
1316         *mp = m;
1317         return (0);
1318 }
1319
1320 /*
1321  * Insert jumbo payload option.
1322  */
1323 static int
1324 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1325 {
1326         struct mbuf *mopt;
1327         u_char *optbuf;
1328         u_int32_t v;
1329
1330 #define JUMBOOPTLEN     8       /* length of jumbo payload option and padding */
1331
1332         /*
1333          * If there is no hop-by-hop options header, allocate new one.
1334          * If there is one but it doesn't have enough space to store the
1335          * jumbo payload option, allocate a cluster to store the whole options.
1336          * Otherwise, use it to store the options.
1337          */
1338         if (exthdrs->ip6e_hbh == NULL) {
1339                 mopt = m_get(M_NOWAIT, MT_DATA);
1340                 if (mopt == NULL)
1341                         return (ENOBUFS);
1342                 mopt->m_len = JUMBOOPTLEN;
1343                 optbuf = mtod(mopt, u_char *);
1344                 optbuf[1] = 0;  /* = ((JUMBOOPTLEN) >> 3) - 1 */
1345                 exthdrs->ip6e_hbh = mopt;
1346         } else {
1347                 struct ip6_hbh *hbh;
1348
1349                 mopt = exthdrs->ip6e_hbh;
1350                 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1351                         /*
1352                          * XXX assumption:
1353                          * - exthdrs->ip6e_hbh is not referenced from places
1354                          *   other than exthdrs.
1355                          * - exthdrs->ip6e_hbh is not an mbuf chain.
1356                          */
1357                         int oldoptlen = mopt->m_len;
1358                         struct mbuf *n;
1359
1360                         /*
1361                          * XXX: give up if the whole (new) hbh header does
1362                          * not fit even in an mbuf cluster.
1363                          */
1364                         if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1365                                 return (ENOBUFS);
1366
1367                         /*
1368                          * As a consequence, we must always prepare a cluster
1369                          * at this point.
1370                          */
1371                         n = m_getcl(M_NOWAIT, MT_DATA, 0);
1372                         if (n == NULL)
1373                                 return (ENOBUFS);
1374                         n->m_len = oldoptlen + JUMBOOPTLEN;
1375                         bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1376                             oldoptlen);
1377                         optbuf = mtod(n, caddr_t) + oldoptlen;
1378                         m_freem(mopt);
1379                         mopt = exthdrs->ip6e_hbh = n;
1380                 } else {
1381                         optbuf = mtod(mopt, u_char *) + mopt->m_len;
1382                         mopt->m_len += JUMBOOPTLEN;
1383                 }
1384                 optbuf[0] = IP6OPT_PADN;
1385                 optbuf[1] = 1;
1386
1387                 /*
1388                  * Adjust the header length according to the pad and
1389                  * the jumbo payload option.
1390                  */
1391                 hbh = mtod(mopt, struct ip6_hbh *);
1392                 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1393         }
1394
1395         /* fill in the option. */
1396         optbuf[2] = IP6OPT_JUMBO;
1397         optbuf[3] = 4;
1398         v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1399         bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1400
1401         /* finally, adjust the packet header length */
1402         exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1403
1404         return (0);
1405 #undef JUMBOOPTLEN
1406 }
1407
1408 /*
1409  * Insert fragment header and copy unfragmentable header portions.
1410  */
1411 static int
1412 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1413     struct ip6_frag **frghdrp)
1414 {
1415         struct mbuf *n, *mlast;
1416
1417         if (hlen > sizeof(struct ip6_hdr)) {
1418                 n = m_copym(m0, sizeof(struct ip6_hdr),
1419                     hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1420                 if (n == NULL)
1421                         return (ENOBUFS);
1422                 m->m_next = n;
1423         } else
1424                 n = m;
1425
1426         /* Search for the last mbuf of unfragmentable part. */
1427         for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1428                 ;
1429
1430         if (M_WRITABLE(mlast) &&
1431             M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1432                 /* use the trailing space of the last mbuf for the fragment hdr */
1433                 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1434                     mlast->m_len);
1435                 mlast->m_len += sizeof(struct ip6_frag);
1436                 m->m_pkthdr.len += sizeof(struct ip6_frag);
1437         } else {
1438                 /* allocate a new mbuf for the fragment header */
1439                 struct mbuf *mfrg;
1440
1441                 mfrg = m_get(M_NOWAIT, MT_DATA);
1442                 if (mfrg == NULL)
1443                         return (ENOBUFS);
1444                 mfrg->m_len = sizeof(struct ip6_frag);
1445                 *frghdrp = mtod(mfrg, struct ip6_frag *);
1446                 mlast->m_next = mfrg;
1447         }
1448
1449         return (0);
1450 }
1451
1452 /*
1453  * Calculates IPv6 path mtu for destination @dst.
1454  * Resulting MTU is stored in @mtup.
1455  *
1456  * Returns 0 on success.
1457  */
1458 static int
1459 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup)
1460 {
1461         struct epoch_tracker et;
1462         struct nhop_object *nh;
1463         struct in6_addr kdst;
1464         uint32_t scopeid;
1465         int error;
1466
1467         in6_splitscope(dst, &kdst, &scopeid);
1468
1469         NET_EPOCH_ENTER(et);
1470         nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0);
1471         if (nh != NULL)
1472                 error = ip6_calcmtu(nh->nh_ifp, dst, nh->nh_mtu, mtup, NULL, 0);
1473         else
1474                 error = EHOSTUNREACH;
1475         NET_EPOCH_EXIT(et);
1476
1477         return (error);
1478 }
1479
1480 /*
1481  * Calculates IPv6 path MTU for @dst based on transmit @ifp,
1482  * and cached data in @ro_pmtu.
1483  * MTU from (successful) route lookup is saved (along with dst)
1484  * inside @ro_pmtu to avoid subsequent route lookups after packet
1485  * filter processing.
1486  *
1487  * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1488  * Returns 0 on success.
1489  */
1490 static int
1491 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup,
1492     struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup,
1493     int *alwaysfragp, u_int fibnum, u_int proto)
1494 {
1495         struct nhop_object *nh;
1496         struct in6_addr kdst;
1497         uint32_t scopeid;
1498         struct sockaddr_in6 *sa6_dst, sin6;
1499         u_long mtu;
1500
1501         NET_EPOCH_ASSERT();
1502
1503         mtu = 0;
1504         if (ro_pmtu == NULL || do_lookup) {
1505                 /*
1506                  * Here ro_pmtu has final destination address, while
1507                  * ro might represent immediate destination.
1508                  * Use ro_pmtu destination since mtu might differ.
1509                  */
1510                 if (ro_pmtu != NULL) {
1511                         sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1512                         if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))
1513                                 ro_pmtu->ro_mtu = 0;
1514                 } else
1515                         sa6_dst = &sin6;
1516
1517                 if (ro_pmtu == NULL || ro_pmtu->ro_mtu == 0) {
1518                         bzero(sa6_dst, sizeof(*sa6_dst));
1519                         sa6_dst->sin6_family = AF_INET6;
1520                         sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1521                         sa6_dst->sin6_addr = *dst;
1522
1523                         in6_splitscope(dst, &kdst, &scopeid);
1524                         nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0);
1525                         if (nh != NULL) {
1526                                 mtu = nh->nh_mtu;
1527                                 if (ro_pmtu != NULL)
1528                                         ro_pmtu->ro_mtu = mtu;
1529                         }
1530                 } else
1531                         mtu = ro_pmtu->ro_mtu;
1532         }
1533
1534         if (ro_pmtu != NULL && ro_pmtu->ro_nh != NULL)
1535                 mtu = ro_pmtu->ro_nh->nh_mtu;
1536
1537         return (ip6_calcmtu(ifp, dst, mtu, mtup, alwaysfragp, proto));
1538 }
1539
1540 /*
1541  * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and
1542  * hostcache data for @dst.
1543  * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1544  *
1545  * Returns 0 on success.
1546  */
1547 static int
1548 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu,
1549     u_long *mtup, int *alwaysfragp, u_int proto)
1550 {
1551         u_long mtu = 0;
1552         int alwaysfrag = 0;
1553         int error = 0;
1554
1555         if (rt_mtu > 0) {
1556                 u_int32_t ifmtu;
1557                 struct in_conninfo inc;
1558
1559                 bzero(&inc, sizeof(inc));
1560                 inc.inc_flags |= INC_ISIPV6;
1561                 inc.inc6_faddr = *dst;
1562
1563                 ifmtu = IN6_LINKMTU(ifp);
1564
1565                 /* TCP is known to react to pmtu changes so skip hc */
1566                 if (proto != IPPROTO_TCP)
1567                         mtu = tcp_hc_getmtu(&inc);
1568
1569                 if (mtu)
1570                         mtu = min(mtu, rt_mtu);
1571                 else
1572                         mtu = rt_mtu;
1573                 if (mtu == 0)
1574                         mtu = ifmtu;
1575                 else if (mtu < IPV6_MMTU) {
1576                         /*
1577                          * RFC2460 section 5, last paragraph:
1578                          * if we record ICMPv6 too big message with
1579                          * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1580                          * or smaller, with framgent header attached.
1581                          * (fragment header is needed regardless from the
1582                          * packet size, for translators to identify packets)
1583                          */
1584                         alwaysfrag = 1;
1585                         mtu = IPV6_MMTU;
1586                 }
1587         } else if (ifp) {
1588                 mtu = IN6_LINKMTU(ifp);
1589         } else
1590                 error = EHOSTUNREACH; /* XXX */
1591
1592         *mtup = mtu;
1593         if (alwaysfragp)
1594                 *alwaysfragp = alwaysfrag;
1595         return (error);
1596 }
1597
1598 /*
1599  * IP6 socket option processing.
1600  */
1601 int
1602 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1603 {
1604         int optdatalen, uproto;
1605         void *optdata;
1606         struct inpcb *inp = sotoinpcb(so);
1607         int error, optval;
1608         int level, op, optname;
1609         int optlen;
1610         struct thread *td;
1611 #ifdef  RSS
1612         uint32_t rss_bucket;
1613         int retval;
1614 #endif
1615
1616 /*
1617  * Don't use more than a quarter of mbuf clusters.  N.B.:
1618  * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow
1619  * on LP64 architectures, so cast to u_long to avoid undefined
1620  * behavior.  ILP32 architectures cannot have nmbclusters
1621  * large enough to overflow for other reasons.
1622  */
1623 #define IPV6_PKTOPTIONS_MBUF_LIMIT      ((u_long)nmbclusters * MCLBYTES / 4)
1624
1625         level = sopt->sopt_level;
1626         op = sopt->sopt_dir;
1627         optname = sopt->sopt_name;
1628         optlen = sopt->sopt_valsize;
1629         td = sopt->sopt_td;
1630         error = 0;
1631         optval = 0;
1632         uproto = (int)so->so_proto->pr_protocol;
1633
1634         if (level != IPPROTO_IPV6) {
1635                 error = EINVAL;
1636
1637                 if (sopt->sopt_level == SOL_SOCKET &&
1638                     sopt->sopt_dir == SOPT_SET) {
1639                         switch (sopt->sopt_name) {
1640                         case SO_SETFIB:
1641                                 INP_WLOCK(inp);
1642                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
1643                                 INP_WUNLOCK(inp);
1644                                 error = 0;
1645                                 break;
1646                         case SO_MAX_PACING_RATE:
1647 #ifdef RATELIMIT
1648                                 INP_WLOCK(inp);
1649                                 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1650                                 INP_WUNLOCK(inp);
1651                                 error = 0;
1652 #else
1653                                 error = EOPNOTSUPP;
1654 #endif
1655                                 break;
1656                         default:
1657                                 break;
1658                         }
1659                 }
1660         } else {                /* level == IPPROTO_IPV6 */
1661                 switch (op) {
1662                 case SOPT_SET:
1663                         switch (optname) {
1664                         case IPV6_2292PKTOPTIONS:
1665 #ifdef IPV6_PKTOPTIONS
1666                         case IPV6_PKTOPTIONS:
1667 #endif
1668                         {
1669                                 struct mbuf *m;
1670
1671                                 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) {
1672                                         printf("ip6_ctloutput: mbuf limit hit\n");
1673                                         error = ENOBUFS;
1674                                         break;
1675                                 }
1676
1677                                 error = soopt_getm(sopt, &m); /* XXX */
1678                                 if (error != 0)
1679                                         break;
1680                                 error = soopt_mcopyin(sopt, m); /* XXX */
1681                                 if (error != 0)
1682                                         break;
1683                                 INP_WLOCK(inp);
1684                                 error = ip6_pcbopts(&inp->in6p_outputopts, m,
1685                                     so, sopt);
1686                                 INP_WUNLOCK(inp);
1687                                 m_freem(m); /* XXX */
1688                                 break;
1689                         }
1690
1691                         /*
1692                          * Use of some Hop-by-Hop options or some
1693                          * Destination options, might require special
1694                          * privilege.  That is, normal applications
1695                          * (without special privilege) might be forbidden
1696                          * from setting certain options in outgoing packets,
1697                          * and might never see certain options in received
1698                          * packets. [RFC 2292 Section 6]
1699                          * KAME specific note:
1700                          *  KAME prevents non-privileged users from sending or
1701                          *  receiving ANY hbh/dst options in order to avoid
1702                          *  overhead of parsing options in the kernel.
1703                          */
1704                         case IPV6_RECVHOPOPTS:
1705                         case IPV6_RECVDSTOPTS:
1706                         case IPV6_RECVRTHDRDSTOPTS:
1707                                 if (td != NULL) {
1708                                         error = priv_check(td,
1709                                             PRIV_NETINET_SETHDROPTS);
1710                                         if (error)
1711                                                 break;
1712                                 }
1713                                 /* FALLTHROUGH */
1714                         case IPV6_UNICAST_HOPS:
1715                         case IPV6_HOPLIMIT:
1716
1717                         case IPV6_RECVPKTINFO:
1718                         case IPV6_RECVHOPLIMIT:
1719                         case IPV6_RECVRTHDR:
1720                         case IPV6_RECVPATHMTU:
1721                         case IPV6_RECVTCLASS:
1722                         case IPV6_RECVFLOWID:
1723 #ifdef  RSS
1724                         case IPV6_RECVRSSBUCKETID:
1725 #endif
1726                         case IPV6_V6ONLY:
1727                         case IPV6_AUTOFLOWLABEL:
1728                         case IPV6_ORIGDSTADDR:
1729                         case IPV6_BINDANY:
1730                         case IPV6_VLAN_PCP:
1731                                 if (optname == IPV6_BINDANY && td != NULL) {
1732                                         error = priv_check(td,
1733                                             PRIV_NETINET_BINDANY);
1734                                         if (error)
1735                                                 break;
1736                                 }
1737
1738                                 if (optlen != sizeof(int)) {
1739                                         error = EINVAL;
1740                                         break;
1741                                 }
1742                                 error = sooptcopyin(sopt, &optval,
1743                                         sizeof optval, sizeof optval);
1744                                 if (error)
1745                                         break;
1746                                 switch (optname) {
1747                                 case IPV6_UNICAST_HOPS:
1748                                         if (optval < -1 || optval >= 256)
1749                                                 error = EINVAL;
1750                                         else {
1751                                                 /* -1 = kernel default */
1752                                                 inp->in6p_hops = optval;
1753                                                 if ((inp->inp_vflag &
1754                                                      INP_IPV4) != 0)
1755                                                         inp->inp_ip_ttl = optval;
1756                                         }
1757                                         break;
1758 #define OPTSET(bit) \
1759 do { \
1760         INP_WLOCK(inp); \
1761         if (optval) \
1762                 inp->inp_flags |= (bit); \
1763         else \
1764                 inp->inp_flags &= ~(bit); \
1765         INP_WUNLOCK(inp); \
1766 } while (/*CONSTCOND*/ 0)
1767 #define OPTSET2292(bit) \
1768 do { \
1769         INP_WLOCK(inp); \
1770         inp->inp_flags |= IN6P_RFC2292; \
1771         if (optval) \
1772                 inp->inp_flags |= (bit); \
1773         else \
1774                 inp->inp_flags &= ~(bit); \
1775         INP_WUNLOCK(inp); \
1776 } while (/*CONSTCOND*/ 0)
1777 #define OPTBIT(bit) (inp->inp_flags & (bit) ? 1 : 0)
1778
1779 #define OPTSET2_N(bit, val) do {                                        \
1780         if (val)                                                        \
1781                 inp->inp_flags2 |= bit;                                 \
1782         else                                                            \
1783                 inp->inp_flags2 &= ~bit;                                \
1784 } while (0)
1785 #define OPTSET2(bit, val) do {                                          \
1786         INP_WLOCK(inp);                                                 \
1787         OPTSET2_N(bit, val);                                            \
1788         INP_WUNLOCK(inp);                                               \
1789 } while (0)
1790 #define OPTBIT2(bit) (inp->inp_flags2 & (bit) ? 1 : 0)
1791 #define OPTSET2292_EXCLUSIVE(bit)                                       \
1792 do {                                                                    \
1793         INP_WLOCK(inp);                                                 \
1794         if (OPTBIT(IN6P_RFC2292)) {                                     \
1795                 error = EINVAL;                                         \
1796         } else {                                                        \
1797                 if (optval)                                             \
1798                         inp->inp_flags |= (bit);                        \
1799                 else                                                    \
1800                         inp->inp_flags &= ~(bit);                       \
1801         }                                                               \
1802         INP_WUNLOCK(inp);                                               \
1803 } while (/*CONSTCOND*/ 0)
1804
1805                                 case IPV6_RECVPKTINFO:
1806                                         OPTSET2292_EXCLUSIVE(IN6P_PKTINFO);
1807                                         break;
1808
1809                                 case IPV6_HOPLIMIT:
1810                                 {
1811                                         struct ip6_pktopts **optp;
1812
1813                                         /* cannot mix with RFC2292 */
1814                                         if (OPTBIT(IN6P_RFC2292)) {
1815                                                 error = EINVAL;
1816                                                 break;
1817                                         }
1818                                         INP_WLOCK(inp);
1819                                         if (inp->inp_flags & INP_DROPPED) {
1820                                                 INP_WUNLOCK(inp);
1821                                                 return (ECONNRESET);
1822                                         }
1823                                         optp = &inp->in6p_outputopts;
1824                                         error = ip6_pcbopt(IPV6_HOPLIMIT,
1825                                             (u_char *)&optval, sizeof(optval),
1826                                             optp, (td != NULL) ? td->td_ucred :
1827                                             NULL, uproto);
1828                                         INP_WUNLOCK(inp);
1829                                         break;
1830                                 }
1831
1832                                 case IPV6_RECVHOPLIMIT:
1833                                         OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT);
1834                                         break;
1835
1836                                 case IPV6_RECVHOPOPTS:
1837                                         OPTSET2292_EXCLUSIVE(IN6P_HOPOPTS);
1838                                         break;
1839
1840                                 case IPV6_RECVDSTOPTS:
1841                                         OPTSET2292_EXCLUSIVE(IN6P_DSTOPTS);
1842                                         break;
1843
1844                                 case IPV6_RECVRTHDRDSTOPTS:
1845                                         OPTSET2292_EXCLUSIVE(IN6P_RTHDRDSTOPTS);
1846                                         break;
1847
1848                                 case IPV6_RECVRTHDR:
1849                                         OPTSET2292_EXCLUSIVE(IN6P_RTHDR);
1850                                         break;
1851
1852                                 case IPV6_RECVPATHMTU:
1853                                         /*
1854                                          * We ignore this option for TCP
1855                                          * sockets.
1856                                          * (RFC3542 leaves this case
1857                                          * unspecified.)
1858                                          */
1859                                         if (uproto != IPPROTO_TCP)
1860                                                 OPTSET(IN6P_MTU);
1861                                         break;
1862
1863                                 case IPV6_RECVFLOWID:
1864                                         OPTSET2(INP_RECVFLOWID, optval);
1865                                         break;
1866
1867 #ifdef  RSS
1868                                 case IPV6_RECVRSSBUCKETID:
1869                                         OPTSET2(INP_RECVRSSBUCKETID, optval);
1870                                         break;
1871 #endif
1872
1873                                 case IPV6_V6ONLY:
1874                                         INP_WLOCK(inp);
1875                                         if (inp->inp_lport ||
1876                                             !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1877                                                 /*
1878                                                  * The socket is already bound.
1879                                                  */
1880                                                 INP_WUNLOCK(inp);
1881                                                 error = EINVAL;
1882                                                 break;
1883                                         }
1884                                         if (optval) {
1885                                                 inp->inp_flags |= IN6P_IPV6_V6ONLY;
1886                                                 inp->inp_vflag &= ~INP_IPV4;
1887                                         } else {
1888                                                 inp->inp_flags &= ~IN6P_IPV6_V6ONLY;
1889                                                 inp->inp_vflag |= INP_IPV4;
1890                                         }
1891                                         INP_WUNLOCK(inp);
1892                                         break;
1893                                 case IPV6_RECVTCLASS:
1894                                         /* cannot mix with RFC2292 XXX */
1895                                         OPTSET2292_EXCLUSIVE(IN6P_TCLASS);
1896                                         break;
1897                                 case IPV6_AUTOFLOWLABEL:
1898                                         OPTSET(IN6P_AUTOFLOWLABEL);
1899                                         break;
1900
1901                                 case IPV6_ORIGDSTADDR:
1902                                         OPTSET2(INP_ORIGDSTADDR, optval);
1903                                         break;
1904                                 case IPV6_BINDANY:
1905                                         OPTSET(INP_BINDANY);
1906                                         break;
1907                                 case IPV6_VLAN_PCP:
1908                                         if ((optval >= -1) && (optval <=
1909                                             (INP_2PCP_MASK >> INP_2PCP_SHIFT))) {
1910                                                 if (optval == -1) {
1911                                                         INP_WLOCK(inp);
1912                                                         inp->inp_flags2 &=
1913                                                             ~(INP_2PCP_SET |
1914                                                             INP_2PCP_MASK);
1915                                                         INP_WUNLOCK(inp);
1916                                                 } else {
1917                                                         INP_WLOCK(inp);
1918                                                         inp->inp_flags2 |=
1919                                                             INP_2PCP_SET;
1920                                                         inp->inp_flags2 &=
1921                                                             ~INP_2PCP_MASK;
1922                                                         inp->inp_flags2 |=
1923                                                             optval <<
1924                                                             INP_2PCP_SHIFT;
1925                                                         INP_WUNLOCK(inp);
1926                                                 }
1927                                         } else
1928                                                 error = EINVAL;
1929                                         break;
1930                                 }
1931                                 break;
1932
1933                         case IPV6_TCLASS:
1934                         case IPV6_DONTFRAG:
1935                         case IPV6_USE_MIN_MTU:
1936                         case IPV6_PREFER_TEMPADDR:
1937                                 if (optlen != sizeof(optval)) {
1938                                         error = EINVAL;
1939                                         break;
1940                                 }
1941                                 error = sooptcopyin(sopt, &optval,
1942                                         sizeof optval, sizeof optval);
1943                                 if (error)
1944                                         break;
1945                                 {
1946                                         struct ip6_pktopts **optp;
1947                                         INP_WLOCK(inp);
1948                                         if (inp->inp_flags & INP_DROPPED) {
1949                                                 INP_WUNLOCK(inp);
1950                                                 return (ECONNRESET);
1951                                         }
1952                                         optp = &inp->in6p_outputopts;
1953                                         error = ip6_pcbopt(optname,
1954                                             (u_char *)&optval, sizeof(optval),
1955                                             optp, (td != NULL) ? td->td_ucred :
1956                                             NULL, uproto);
1957                                         INP_WUNLOCK(inp);
1958                                         break;
1959                                 }
1960
1961                         case IPV6_2292PKTINFO:
1962                         case IPV6_2292HOPLIMIT:
1963                         case IPV6_2292HOPOPTS:
1964                         case IPV6_2292DSTOPTS:
1965                         case IPV6_2292RTHDR:
1966                                 /* RFC 2292 */
1967                                 if (optlen != sizeof(int)) {
1968                                         error = EINVAL;
1969                                         break;
1970                                 }
1971                                 error = sooptcopyin(sopt, &optval,
1972                                         sizeof optval, sizeof optval);
1973                                 if (error)
1974                                         break;
1975                                 switch (optname) {
1976                                 case IPV6_2292PKTINFO:
1977                                         OPTSET2292(IN6P_PKTINFO);
1978                                         break;
1979                                 case IPV6_2292HOPLIMIT:
1980                                         OPTSET2292(IN6P_HOPLIMIT);
1981                                         break;
1982                                 case IPV6_2292HOPOPTS:
1983                                         /*
1984                                          * Check super-user privilege.
1985                                          * See comments for IPV6_RECVHOPOPTS.
1986                                          */
1987                                         if (td != NULL) {
1988                                                 error = priv_check(td,
1989                                                     PRIV_NETINET_SETHDROPTS);
1990                                                 if (error)
1991                                                         return (error);
1992                                         }
1993                                         OPTSET2292(IN6P_HOPOPTS);
1994                                         break;
1995                                 case IPV6_2292DSTOPTS:
1996                                         if (td != NULL) {
1997                                                 error = priv_check(td,
1998                                                     PRIV_NETINET_SETHDROPTS);
1999                                                 if (error)
2000                                                         return (error);
2001                                         }
2002                                         OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
2003                                         break;
2004                                 case IPV6_2292RTHDR:
2005                                         OPTSET2292(IN6P_RTHDR);
2006                                         break;
2007                                 }
2008                                 break;
2009                         case IPV6_PKTINFO:
2010                         case IPV6_HOPOPTS:
2011                         case IPV6_RTHDR:
2012                         case IPV6_DSTOPTS:
2013                         case IPV6_RTHDRDSTOPTS:
2014                         case IPV6_NEXTHOP:
2015                         {
2016                                 /* new advanced API (RFC3542) */
2017                                 u_char *optbuf;
2018                                 u_char optbuf_storage[MCLBYTES];
2019                                 int optlen;
2020                                 struct ip6_pktopts **optp;
2021
2022                                 /* cannot mix with RFC2292 */
2023                                 if (OPTBIT(IN6P_RFC2292)) {
2024                                         error = EINVAL;
2025                                         break;
2026                                 }
2027
2028                                 /*
2029                                  * We only ensure valsize is not too large
2030                                  * here.  Further validation will be done
2031                                  * later.
2032                                  */
2033                                 error = sooptcopyin(sopt, optbuf_storage,
2034                                     sizeof(optbuf_storage), 0);
2035                                 if (error)
2036                                         break;
2037                                 optlen = sopt->sopt_valsize;
2038                                 optbuf = optbuf_storage;
2039                                 INP_WLOCK(inp);
2040                                 if (inp->inp_flags & INP_DROPPED) {
2041                                         INP_WUNLOCK(inp);
2042                                         return (ECONNRESET);
2043                                 }
2044                                 optp = &inp->in6p_outputopts;
2045                                 error = ip6_pcbopt(optname, optbuf, optlen,
2046                                     optp, (td != NULL) ? td->td_ucred : NULL,
2047                                     uproto);
2048                                 INP_WUNLOCK(inp);
2049                                 break;
2050                         }
2051 #undef OPTSET
2052
2053                         case IPV6_MULTICAST_IF:
2054                         case IPV6_MULTICAST_HOPS:
2055                         case IPV6_MULTICAST_LOOP:
2056                         case IPV6_JOIN_GROUP:
2057                         case IPV6_LEAVE_GROUP:
2058                         case IPV6_MSFILTER:
2059                         case MCAST_BLOCK_SOURCE:
2060                         case MCAST_UNBLOCK_SOURCE:
2061                         case MCAST_JOIN_GROUP:
2062                         case MCAST_LEAVE_GROUP:
2063                         case MCAST_JOIN_SOURCE_GROUP:
2064                         case MCAST_LEAVE_SOURCE_GROUP:
2065                                 error = ip6_setmoptions(inp, sopt);
2066                                 break;
2067
2068                         case IPV6_PORTRANGE:
2069                                 error = sooptcopyin(sopt, &optval,
2070                                     sizeof optval, sizeof optval);
2071                                 if (error)
2072                                         break;
2073
2074                                 INP_WLOCK(inp);
2075                                 switch (optval) {
2076                                 case IPV6_PORTRANGE_DEFAULT:
2077                                         inp->inp_flags &= ~(INP_LOWPORT);
2078                                         inp->inp_flags &= ~(INP_HIGHPORT);
2079                                         break;
2080
2081                                 case IPV6_PORTRANGE_HIGH:
2082                                         inp->inp_flags &= ~(INP_LOWPORT);
2083                                         inp->inp_flags |= INP_HIGHPORT;
2084                                         break;
2085
2086                                 case IPV6_PORTRANGE_LOW:
2087                                         inp->inp_flags &= ~(INP_HIGHPORT);
2088                                         inp->inp_flags |= INP_LOWPORT;
2089                                         break;
2090
2091                                 default:
2092                                         error = EINVAL;
2093                                         break;
2094                                 }
2095                                 INP_WUNLOCK(inp);
2096                                 break;
2097
2098 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
2099                         case IPV6_IPSEC_POLICY:
2100                                 if (IPSEC_ENABLED(ipv6)) {
2101                                         error = IPSEC_PCBCTL(ipv6, inp, sopt);
2102                                         break;
2103                                 }
2104                                 /* FALLTHROUGH */
2105 #endif /* IPSEC */
2106
2107                         default:
2108                                 error = ENOPROTOOPT;
2109                                 break;
2110                         }
2111                         break;
2112
2113                 case SOPT_GET:
2114                         switch (optname) {
2115                         case IPV6_2292PKTOPTIONS:
2116 #ifdef IPV6_PKTOPTIONS
2117                         case IPV6_PKTOPTIONS:
2118 #endif
2119                                 /*
2120                                  * RFC3542 (effectively) deprecated the
2121                                  * semantics of the 2292-style pktoptions.
2122                                  * Since it was not reliable in nature (i.e.,
2123                                  * applications had to expect the lack of some
2124                                  * information after all), it would make sense
2125                                  * to simplify this part by always returning
2126                                  * empty data.
2127                                  */
2128                                 sopt->sopt_valsize = 0;
2129                                 break;
2130
2131                         case IPV6_RECVHOPOPTS:
2132                         case IPV6_RECVDSTOPTS:
2133                         case IPV6_RECVRTHDRDSTOPTS:
2134                         case IPV6_UNICAST_HOPS:
2135                         case IPV6_RECVPKTINFO:
2136                         case IPV6_RECVHOPLIMIT:
2137                         case IPV6_RECVRTHDR:
2138                         case IPV6_RECVPATHMTU:
2139
2140                         case IPV6_V6ONLY:
2141                         case IPV6_PORTRANGE:
2142                         case IPV6_RECVTCLASS:
2143                         case IPV6_AUTOFLOWLABEL:
2144                         case IPV6_BINDANY:
2145                         case IPV6_FLOWID:
2146                         case IPV6_FLOWTYPE:
2147                         case IPV6_RECVFLOWID:
2148 #ifdef  RSS
2149                         case IPV6_RSSBUCKETID:
2150                         case IPV6_RECVRSSBUCKETID:
2151 #endif
2152                         case IPV6_VLAN_PCP:
2153                                 switch (optname) {
2154                                 case IPV6_RECVHOPOPTS:
2155                                         optval = OPTBIT(IN6P_HOPOPTS);
2156                                         break;
2157
2158                                 case IPV6_RECVDSTOPTS:
2159                                         optval = OPTBIT(IN6P_DSTOPTS);
2160                                         break;
2161
2162                                 case IPV6_RECVRTHDRDSTOPTS:
2163                                         optval = OPTBIT(IN6P_RTHDRDSTOPTS);
2164                                         break;
2165
2166                                 case IPV6_UNICAST_HOPS:
2167                                         optval = inp->in6p_hops;
2168                                         break;
2169
2170                                 case IPV6_RECVPKTINFO:
2171                                         optval = OPTBIT(IN6P_PKTINFO);
2172                                         break;
2173
2174                                 case IPV6_RECVHOPLIMIT:
2175                                         optval = OPTBIT(IN6P_HOPLIMIT);
2176                                         break;
2177
2178                                 case IPV6_RECVRTHDR:
2179                                         optval = OPTBIT(IN6P_RTHDR);
2180                                         break;
2181
2182                                 case IPV6_RECVPATHMTU:
2183                                         optval = OPTBIT(IN6P_MTU);
2184                                         break;
2185
2186                                 case IPV6_V6ONLY:
2187                                         optval = OPTBIT(IN6P_IPV6_V6ONLY);
2188                                         break;
2189
2190                                 case IPV6_PORTRANGE:
2191                                     {
2192                                         int flags;
2193                                         flags = inp->inp_flags;
2194                                         if (flags & INP_HIGHPORT)
2195                                                 optval = IPV6_PORTRANGE_HIGH;
2196                                         else if (flags & INP_LOWPORT)
2197                                                 optval = IPV6_PORTRANGE_LOW;
2198                                         else
2199                                                 optval = 0;
2200                                         break;
2201                                     }
2202                                 case IPV6_RECVTCLASS:
2203                                         optval = OPTBIT(IN6P_TCLASS);
2204                                         break;
2205
2206                                 case IPV6_AUTOFLOWLABEL:
2207                                         optval = OPTBIT(IN6P_AUTOFLOWLABEL);
2208                                         break;
2209
2210                                 case IPV6_ORIGDSTADDR:
2211                                         optval = OPTBIT2(INP_ORIGDSTADDR);
2212                                         break;
2213
2214                                 case IPV6_BINDANY:
2215                                         optval = OPTBIT(INP_BINDANY);
2216                                         break;
2217
2218                                 case IPV6_FLOWID:
2219                                         optval = inp->inp_flowid;
2220                                         break;
2221
2222                                 case IPV6_FLOWTYPE:
2223                                         optval = inp->inp_flowtype;
2224                                         break;
2225
2226                                 case IPV6_RECVFLOWID:
2227                                         optval = OPTBIT2(INP_RECVFLOWID);
2228                                         break;
2229 #ifdef  RSS
2230                                 case IPV6_RSSBUCKETID:
2231                                         retval =
2232                                             rss_hash2bucket(inp->inp_flowid,
2233                                             inp->inp_flowtype,
2234                                             &rss_bucket);
2235                                         if (retval == 0)
2236                                                 optval = rss_bucket;
2237                                         else
2238                                                 error = EINVAL;
2239                                         break;
2240
2241                                 case IPV6_RECVRSSBUCKETID:
2242                                         optval = OPTBIT2(INP_RECVRSSBUCKETID);
2243                                         break;
2244 #endif
2245
2246
2247                                 case IPV6_VLAN_PCP:
2248                                         if (OPTBIT2(INP_2PCP_SET)) {
2249                                                 optval = (inp->inp_flags2 &
2250                                                             INP_2PCP_MASK) >>
2251                                                             INP_2PCP_SHIFT;
2252                                         } else {
2253                                                 optval = -1;
2254                                         }
2255                                         break;
2256                                 }
2257
2258                                 if (error)
2259                                         break;
2260                                 error = sooptcopyout(sopt, &optval,
2261                                         sizeof optval);
2262                                 break;
2263
2264                         case IPV6_PATHMTU:
2265                         {
2266                                 u_long pmtu = 0;
2267                                 struct ip6_mtuinfo mtuinfo;
2268                                 struct in6_addr addr;
2269
2270                                 if (!(so->so_state & SS_ISCONNECTED))
2271                                         return (ENOTCONN);
2272                                 /*
2273                                  * XXX: we dot not consider the case of source
2274                                  * routing, or optional information to specify
2275                                  * the outgoing interface.
2276                                  * Copy faddr out of inp to avoid holding lock
2277                                  * on inp during route lookup.
2278                                  */
2279                                 INP_RLOCK(inp);
2280                                 bcopy(&inp->in6p_faddr, &addr, sizeof(addr));
2281                                 INP_RUNLOCK(inp);
2282                                 error = ip6_getpmtu_ctl(so->so_fibnum,
2283                                     &addr, &pmtu);
2284                                 if (error)
2285                                         break;
2286                                 if (pmtu > IPV6_MAXPACKET)
2287                                         pmtu = IPV6_MAXPACKET;
2288
2289                                 bzero(&mtuinfo, sizeof(mtuinfo));
2290                                 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
2291                                 optdata = (void *)&mtuinfo;
2292                                 optdatalen = sizeof(mtuinfo);
2293                                 error = sooptcopyout(sopt, optdata,
2294                                     optdatalen);
2295                                 break;
2296                         }
2297
2298                         case IPV6_2292PKTINFO:
2299                         case IPV6_2292HOPLIMIT:
2300                         case IPV6_2292HOPOPTS:
2301                         case IPV6_2292RTHDR:
2302                         case IPV6_2292DSTOPTS:
2303                                 switch (optname) {
2304                                 case IPV6_2292PKTINFO:
2305                                         optval = OPTBIT(IN6P_PKTINFO);
2306                                         break;
2307                                 case IPV6_2292HOPLIMIT:
2308                                         optval = OPTBIT(IN6P_HOPLIMIT);
2309                                         break;
2310                                 case IPV6_2292HOPOPTS:
2311                                         optval = OPTBIT(IN6P_HOPOPTS);
2312                                         break;
2313                                 case IPV6_2292RTHDR:
2314                                         optval = OPTBIT(IN6P_RTHDR);
2315                                         break;
2316                                 case IPV6_2292DSTOPTS:
2317                                         optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
2318                                         break;
2319                                 }
2320                                 error = sooptcopyout(sopt, &optval,
2321                                     sizeof optval);
2322                                 break;
2323                         case IPV6_PKTINFO:
2324                         case IPV6_HOPOPTS:
2325                         case IPV6_RTHDR:
2326                         case IPV6_DSTOPTS:
2327                         case IPV6_RTHDRDSTOPTS:
2328                         case IPV6_NEXTHOP:
2329                         case IPV6_TCLASS:
2330                         case IPV6_DONTFRAG:
2331                         case IPV6_USE_MIN_MTU:
2332                         case IPV6_PREFER_TEMPADDR:
2333                                 error = ip6_getpcbopt(inp, optname, sopt);
2334                                 break;
2335
2336                         case IPV6_MULTICAST_IF:
2337                         case IPV6_MULTICAST_HOPS:
2338                         case IPV6_MULTICAST_LOOP:
2339                         case IPV6_MSFILTER:
2340                                 error = ip6_getmoptions(inp, sopt);
2341                                 break;
2342
2343 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
2344                         case IPV6_IPSEC_POLICY:
2345                                 if (IPSEC_ENABLED(ipv6)) {
2346                                         error = IPSEC_PCBCTL(ipv6, inp, sopt);
2347                                         break;
2348                                 }
2349                                 /* FALLTHROUGH */
2350 #endif /* IPSEC */
2351                         default:
2352                                 error = ENOPROTOOPT;
2353                                 break;
2354                         }
2355                         break;
2356                 }
2357         }
2358         return (error);
2359 }
2360
2361 int
2362 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2363 {
2364         int error = 0, optval, optlen;
2365         const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2366         struct inpcb *inp = sotoinpcb(so);
2367         int level, op, optname;
2368
2369         level = sopt->sopt_level;
2370         op = sopt->sopt_dir;
2371         optname = sopt->sopt_name;
2372         optlen = sopt->sopt_valsize;
2373
2374         if (level != IPPROTO_IPV6) {
2375                 return (EINVAL);
2376         }
2377
2378         switch (optname) {
2379         case IPV6_CHECKSUM:
2380                 /*
2381                  * For ICMPv6 sockets, no modification allowed for checksum
2382                  * offset, permit "no change" values to help existing apps.
2383                  *
2384                  * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2385                  * for an ICMPv6 socket will fail."
2386                  * The current behavior does not meet RFC3542.
2387                  */
2388                 switch (op) {
2389                 case SOPT_SET:
2390                         if (optlen != sizeof(int)) {
2391                                 error = EINVAL;
2392                                 break;
2393                         }
2394                         error = sooptcopyin(sopt, &optval, sizeof(optval),
2395                                             sizeof(optval));
2396                         if (error)
2397                                 break;
2398                         if (optval < -1 || (optval % 2) != 0) {
2399                                 /*
2400                                  * The API assumes non-negative even offset
2401                                  * values or -1 as a special value.
2402                                  */
2403                                 error = EINVAL;
2404                         } else if (inp->inp_ip_p == IPPROTO_ICMPV6) {
2405                                 if (optval != icmp6off)
2406                                         error = EINVAL;
2407                         } else
2408                                 inp->in6p_cksum = optval;
2409                         break;
2410
2411                 case SOPT_GET:
2412                         if (inp->inp_ip_p == IPPROTO_ICMPV6)
2413                                 optval = icmp6off;
2414                         else
2415                                 optval = inp->in6p_cksum;
2416
2417                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2418                         break;
2419
2420                 default:
2421                         error = EINVAL;
2422                         break;
2423                 }
2424                 break;
2425
2426         default:
2427                 error = ENOPROTOOPT;
2428                 break;
2429         }
2430
2431         return (error);
2432 }
2433
2434 /*
2435  * Set up IP6 options in pcb for insertion in output packets or
2436  * specifying behavior of outgoing packets.
2437  */
2438 static int
2439 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2440     struct socket *so, struct sockopt *sopt)
2441 {
2442         struct ip6_pktopts *opt = *pktopt;
2443         int error = 0;
2444         struct thread *td = sopt->sopt_td;
2445         struct epoch_tracker et;
2446
2447         /* turn off any old options. */
2448         if (opt) {
2449 #ifdef DIAGNOSTIC
2450                 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2451                     opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2452                     opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2453                         printf("ip6_pcbopts: all specified options are cleared.\n");
2454 #endif
2455                 ip6_clearpktopts(opt, -1);
2456         } else {
2457                 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT);
2458                 if (opt == NULL)
2459                         return (ENOMEM);
2460         }
2461         *pktopt = NULL;
2462
2463         if (!m || m->m_len == 0) {
2464                 /*
2465                  * Only turning off any previous options, regardless of
2466                  * whether the opt is just created or given.
2467                  */
2468                 free(opt, M_IP6OPT);
2469                 return (0);
2470         }
2471
2472         /*  set options specified by user. */
2473         NET_EPOCH_ENTER(et);
2474         if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2475             td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2476                 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2477                 free(opt, M_IP6OPT);
2478                 NET_EPOCH_EXIT(et);
2479                 return (error);
2480         }
2481         NET_EPOCH_EXIT(et);
2482         *pktopt = opt;
2483         return (0);
2484 }
2485
2486 /*
2487  * initialize ip6_pktopts.  beware that there are non-zero default values in
2488  * the struct.
2489  */
2490 void
2491 ip6_initpktopts(struct ip6_pktopts *opt)
2492 {
2493
2494         bzero(opt, sizeof(*opt));
2495         opt->ip6po_hlim = -1;   /* -1 means default hop limit */
2496         opt->ip6po_tclass = -1; /* -1 means default traffic class */
2497         opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2498         opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2499 }
2500
2501 static int
2502 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2503     struct ucred *cred, int uproto)
2504 {
2505         struct epoch_tracker et;
2506         struct ip6_pktopts *opt;
2507         int ret;
2508
2509         if (*pktopt == NULL) {
2510                 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2511                     M_NOWAIT);
2512                 if (*pktopt == NULL)
2513                         return (ENOBUFS);
2514                 ip6_initpktopts(*pktopt);
2515         }
2516         opt = *pktopt;
2517
2518         NET_EPOCH_ENTER(et);
2519         ret = ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto);
2520         NET_EPOCH_EXIT(et);
2521
2522         return (ret);
2523 }
2524
2525 #define GET_PKTOPT_VAR(field, lenexpr) do {                             \
2526         if (pktopt && pktopt->field) {                                  \
2527                 INP_RUNLOCK(inp);                                       \
2528                 optdata = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK); \
2529                 malloc_optdata = true;                                  \
2530                 INP_RLOCK(inp);                                         \
2531                 if (inp->inp_flags & INP_DROPPED) {                     \
2532                         INP_RUNLOCK(inp);                               \
2533                         free(optdata, M_TEMP);                          \
2534                         return (ECONNRESET);                            \
2535                 }                                                       \
2536                 pktopt = inp->in6p_outputopts;                          \
2537                 if (pktopt && pktopt->field) {                          \
2538                         optdatalen = min(lenexpr, sopt->sopt_valsize);  \
2539                         bcopy(pktopt->field, optdata, optdatalen);      \
2540                 } else {                                                \
2541                         free(optdata, M_TEMP);                          \
2542                         optdata = NULL;                                 \
2543                         malloc_optdata = false;                         \
2544                 }                                                       \
2545         }                                                               \
2546 } while(0)
2547
2548 #define GET_PKTOPT_EXT_HDR(field) GET_PKTOPT_VAR(field,                 \
2549         (((struct ip6_ext *)pktopt->field)->ip6e_len + 1) << 3)
2550
2551 #define GET_PKTOPT_SOCKADDR(field) GET_PKTOPT_VAR(field,                \
2552         pktopt->field->sa_len)
2553
2554 static int
2555 ip6_getpcbopt(struct inpcb *inp, int optname, struct sockopt *sopt)
2556 {
2557         void *optdata = NULL;
2558         bool malloc_optdata = false;
2559         int optdatalen = 0;
2560         int error = 0;
2561         struct in6_pktinfo null_pktinfo;
2562         int deftclass = 0, on;
2563         int defminmtu = IP6PO_MINMTU_MCASTONLY;
2564         int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2565         struct ip6_pktopts *pktopt;
2566
2567         INP_RLOCK(inp);
2568         pktopt = inp->in6p_outputopts;
2569
2570         switch (optname) {
2571         case IPV6_PKTINFO:
2572                 optdata = (void *)&null_pktinfo;
2573                 if (pktopt && pktopt->ip6po_pktinfo) {
2574                         bcopy(pktopt->ip6po_pktinfo, &null_pktinfo,
2575                             sizeof(null_pktinfo));
2576                         in6_clearscope(&null_pktinfo.ipi6_addr);
2577                 } else {
2578                         /* XXX: we don't have to do this every time... */
2579                         bzero(&null_pktinfo, sizeof(null_pktinfo));
2580                 }
2581                 optdatalen = sizeof(struct in6_pktinfo);
2582                 break;
2583         case IPV6_TCLASS:
2584                 if (pktopt && pktopt->ip6po_tclass >= 0)
2585                         deftclass = pktopt->ip6po_tclass;
2586                 optdata = (void *)&deftclass;
2587                 optdatalen = sizeof(int);
2588                 break;
2589         case IPV6_HOPOPTS:
2590                 GET_PKTOPT_EXT_HDR(ip6po_hbh);
2591                 break;
2592         case IPV6_RTHDR:
2593                 GET_PKTOPT_EXT_HDR(ip6po_rthdr);
2594                 break;
2595         case IPV6_RTHDRDSTOPTS:
2596                 GET_PKTOPT_EXT_HDR(ip6po_dest1);
2597                 break;
2598         case IPV6_DSTOPTS:
2599                 GET_PKTOPT_EXT_HDR(ip6po_dest2);
2600                 break;
2601         case IPV6_NEXTHOP:
2602                 GET_PKTOPT_SOCKADDR(ip6po_nexthop);
2603                 break;
2604         case IPV6_USE_MIN_MTU:
2605                 if (pktopt)
2606                         defminmtu = pktopt->ip6po_minmtu;
2607                 optdata = (void *)&defminmtu;
2608                 optdatalen = sizeof(int);
2609                 break;
2610         case IPV6_DONTFRAG:
2611                 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2612                         on = 1;
2613                 else
2614                         on = 0;
2615                 optdata = (void *)&on;
2616                 optdatalen = sizeof(on);
2617                 break;
2618         case IPV6_PREFER_TEMPADDR:
2619                 if (pktopt)
2620                         defpreftemp = pktopt->ip6po_prefer_tempaddr;
2621                 optdata = (void *)&defpreftemp;
2622                 optdatalen = sizeof(int);
2623                 break;
2624         default:                /* should not happen */
2625 #ifdef DIAGNOSTIC
2626                 panic("ip6_getpcbopt: unexpected option\n");
2627 #endif
2628                 INP_RUNLOCK(inp);
2629                 return (ENOPROTOOPT);
2630         }
2631         INP_RUNLOCK(inp);
2632
2633         error = sooptcopyout(sopt, optdata, optdatalen);
2634         if (malloc_optdata)
2635                 free(optdata, M_TEMP);
2636
2637         return (error);
2638 }
2639
2640 void
2641 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2642 {
2643         if (pktopt == NULL)
2644                 return;
2645
2646         if (optname == -1 || optname == IPV6_PKTINFO) {
2647                 if (pktopt->ip6po_pktinfo)
2648                         free(pktopt->ip6po_pktinfo, M_IP6OPT);
2649                 pktopt->ip6po_pktinfo = NULL;
2650         }
2651         if (optname == -1 || optname == IPV6_HOPLIMIT)
2652                 pktopt->ip6po_hlim = -1;
2653         if (optname == -1 || optname == IPV6_TCLASS)
2654                 pktopt->ip6po_tclass = -1;
2655         if (optname == -1 || optname == IPV6_NEXTHOP) {
2656                 if (pktopt->ip6po_nextroute.ro_nh) {
2657                         NH_FREE(pktopt->ip6po_nextroute.ro_nh);
2658                         pktopt->ip6po_nextroute.ro_nh = NULL;
2659                 }
2660                 if (pktopt->ip6po_nexthop)
2661                         free(pktopt->ip6po_nexthop, M_IP6OPT);
2662                 pktopt->ip6po_nexthop = NULL;
2663         }
2664         if (optname == -1 || optname == IPV6_HOPOPTS) {
2665                 if (pktopt->ip6po_hbh)
2666                         free(pktopt->ip6po_hbh, M_IP6OPT);
2667                 pktopt->ip6po_hbh = NULL;
2668         }
2669         if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2670                 if (pktopt->ip6po_dest1)
2671                         free(pktopt->ip6po_dest1, M_IP6OPT);
2672                 pktopt->ip6po_dest1 = NULL;
2673         }
2674         if (optname == -1 || optname == IPV6_RTHDR) {
2675                 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2676                         free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2677                 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2678                 if (pktopt->ip6po_route.ro_nh) {
2679                         NH_FREE(pktopt->ip6po_route.ro_nh);
2680                         pktopt->ip6po_route.ro_nh = NULL;
2681                 }
2682         }
2683         if (optname == -1 || optname == IPV6_DSTOPTS) {
2684                 if (pktopt->ip6po_dest2)
2685                         free(pktopt->ip6po_dest2, M_IP6OPT);
2686                 pktopt->ip6po_dest2 = NULL;
2687         }
2688 }
2689
2690 #define PKTOPT_EXTHDRCPY(type) \
2691 do {\
2692         if (src->type) {\
2693                 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2694                 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2695                 if (dst->type == NULL)\
2696                         goto bad;\
2697                 bcopy(src->type, dst->type, hlen);\
2698         }\
2699 } while (/*CONSTCOND*/ 0)
2700
2701 static int
2702 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2703 {
2704         if (dst == NULL || src == NULL)  {
2705                 printf("ip6_clearpktopts: invalid argument\n");
2706                 return (EINVAL);
2707         }
2708
2709         dst->ip6po_hlim = src->ip6po_hlim;
2710         dst->ip6po_tclass = src->ip6po_tclass;
2711         dst->ip6po_flags = src->ip6po_flags;
2712         dst->ip6po_minmtu = src->ip6po_minmtu;
2713         dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2714         if (src->ip6po_pktinfo) {
2715                 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2716                     M_IP6OPT, canwait);
2717                 if (dst->ip6po_pktinfo == NULL)
2718                         goto bad;
2719                 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2720         }
2721         if (src->ip6po_nexthop) {
2722                 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2723                     M_IP6OPT, canwait);
2724                 if (dst->ip6po_nexthop == NULL)
2725                         goto bad;
2726                 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2727                     src->ip6po_nexthop->sa_len);
2728         }
2729         PKTOPT_EXTHDRCPY(ip6po_hbh);
2730         PKTOPT_EXTHDRCPY(ip6po_dest1);
2731         PKTOPT_EXTHDRCPY(ip6po_dest2);
2732         PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2733         return (0);
2734
2735   bad:
2736         ip6_clearpktopts(dst, -1);
2737         return (ENOBUFS);
2738 }
2739 #undef PKTOPT_EXTHDRCPY
2740
2741 struct ip6_pktopts *
2742 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2743 {
2744         int error;
2745         struct ip6_pktopts *dst;
2746
2747         dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2748         if (dst == NULL)
2749                 return (NULL);
2750         ip6_initpktopts(dst);
2751
2752         if ((error = copypktopts(dst, src, canwait)) != 0) {
2753                 free(dst, M_IP6OPT);
2754                 return (NULL);
2755         }
2756
2757         return (dst);
2758 }
2759
2760 void
2761 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2762 {
2763         if (pktopt == NULL)
2764                 return;
2765
2766         ip6_clearpktopts(pktopt, -1);
2767
2768         free(pktopt, M_IP6OPT);
2769 }
2770
2771 /*
2772  * Set IPv6 outgoing packet options based on advanced API.
2773  */
2774 int
2775 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2776     struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2777 {
2778         struct cmsghdr *cm = NULL;
2779
2780         if (control == NULL || opt == NULL)
2781                 return (EINVAL);
2782
2783         /*
2784          * ip6_setpktopt can call ifnet_byindex(), so it's imperative that we
2785          * are in the network epoch here.
2786          */
2787         NET_EPOCH_ASSERT();
2788
2789         ip6_initpktopts(opt);
2790         if (stickyopt) {
2791                 int error;
2792
2793                 /*
2794                  * If stickyopt is provided, make a local copy of the options
2795                  * for this particular packet, then override them by ancillary
2796                  * objects.
2797                  * XXX: copypktopts() does not copy the cached route to a next
2798                  * hop (if any).  This is not very good in terms of efficiency,
2799                  * but we can allow this since this option should be rarely
2800                  * used.
2801                  */
2802                 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2803                         return (error);
2804         }
2805
2806         /*
2807          * XXX: Currently, we assume all the optional information is stored
2808          * in a single mbuf.
2809          */
2810         if (control->m_next)
2811                 return (EINVAL);
2812
2813         for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2814             control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2815                 int error;
2816
2817                 if (control->m_len < CMSG_LEN(0))
2818                         return (EINVAL);
2819
2820                 cm = mtod(control, struct cmsghdr *);
2821                 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2822                         return (EINVAL);
2823                 if (cm->cmsg_level != IPPROTO_IPV6)
2824                         continue;
2825
2826                 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2827                     cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2828                 if (error)
2829                         return (error);
2830         }
2831
2832         return (0);
2833 }
2834
2835 /*
2836  * Set a particular packet option, as a sticky option or an ancillary data
2837  * item.  "len" can be 0 only when it's a sticky option.
2838  * We have 4 cases of combination of "sticky" and "cmsg":
2839  * "sticky=0, cmsg=0": impossible
2840  * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2841  * "sticky=1, cmsg=0": RFC3542 socket option
2842  * "sticky=1, cmsg=1": RFC2292 socket option
2843  */
2844 static int
2845 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2846     struct ucred *cred, int sticky, int cmsg, int uproto)
2847 {
2848         int minmtupolicy, preftemp;
2849         int error;
2850
2851         NET_EPOCH_ASSERT();
2852
2853         if (!sticky && !cmsg) {
2854 #ifdef DIAGNOSTIC
2855                 printf("ip6_setpktopt: impossible case\n");
2856 #endif
2857                 return (EINVAL);
2858         }
2859
2860         /*
2861          * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2862          * not be specified in the context of RFC3542.  Conversely,
2863          * RFC3542 types should not be specified in the context of RFC2292.
2864          */
2865         if (!cmsg) {
2866                 switch (optname) {
2867                 case IPV6_2292PKTINFO:
2868                 case IPV6_2292HOPLIMIT:
2869                 case IPV6_2292NEXTHOP:
2870                 case IPV6_2292HOPOPTS:
2871                 case IPV6_2292DSTOPTS:
2872                 case IPV6_2292RTHDR:
2873                 case IPV6_2292PKTOPTIONS:
2874                         return (ENOPROTOOPT);
2875                 }
2876         }
2877         if (sticky && cmsg) {
2878                 switch (optname) {
2879                 case IPV6_PKTINFO:
2880                 case IPV6_HOPLIMIT:
2881                 case IPV6_NEXTHOP:
2882                 case IPV6_HOPOPTS:
2883                 case IPV6_DSTOPTS:
2884                 case IPV6_RTHDRDSTOPTS:
2885                 case IPV6_RTHDR:
2886                 case IPV6_USE_MIN_MTU:
2887                 case IPV6_DONTFRAG:
2888                 case IPV6_TCLASS:
2889                 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2890                         return (ENOPROTOOPT);
2891                 }
2892         }
2893
2894         switch (optname) {
2895         case IPV6_2292PKTINFO:
2896         case IPV6_PKTINFO:
2897         {
2898                 struct ifnet *ifp = NULL;
2899                 struct in6_pktinfo *pktinfo;
2900
2901                 if (len != sizeof(struct in6_pktinfo))
2902                         return (EINVAL);
2903
2904                 pktinfo = (struct in6_pktinfo *)buf;
2905
2906                 /*
2907                  * An application can clear any sticky IPV6_PKTINFO option by
2908                  * doing a "regular" setsockopt with ipi6_addr being
2909                  * in6addr_any and ipi6_ifindex being zero.
2910                  * [RFC 3542, Section 6]
2911                  */
2912                 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2913                     pktinfo->ipi6_ifindex == 0 &&
2914                     IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2915                         ip6_clearpktopts(opt, optname);
2916                         break;
2917                 }
2918
2919                 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2920                     sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2921                         return (EINVAL);
2922                 }
2923                 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
2924                         return (EINVAL);
2925                 /* validate the interface index if specified. */
2926                 if (pktinfo->ipi6_ifindex) {
2927                         ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2928                         if (ifp == NULL)
2929                                 return (ENXIO);
2930                 }
2931                 if (ifp != NULL && (ifp->if_afdata[AF_INET6] == NULL ||
2932                     (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) != 0))
2933                         return (ENETDOWN);
2934
2935                 if (ifp != NULL &&
2936                     !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2937                         struct in6_ifaddr *ia;
2938
2939                         in6_setscope(&pktinfo->ipi6_addr, ifp, NULL);
2940                         ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr);
2941                         if (ia == NULL)
2942                                 return (EADDRNOTAVAIL);
2943                         ifa_free(&ia->ia_ifa);
2944                 }
2945                 /*
2946                  * We store the address anyway, and let in6_selectsrc()
2947                  * validate the specified address.  This is because ipi6_addr
2948                  * may not have enough information about its scope zone, and
2949                  * we may need additional information (such as outgoing
2950                  * interface or the scope zone of a destination address) to
2951                  * disambiguate the scope.
2952                  * XXX: the delay of the validation may confuse the
2953                  * application when it is used as a sticky option.
2954                  */
2955                 if (opt->ip6po_pktinfo == NULL) {
2956                         opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2957                             M_IP6OPT, M_NOWAIT);
2958                         if (opt->ip6po_pktinfo == NULL)
2959                                 return (ENOBUFS);
2960                 }
2961                 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2962                 break;
2963         }
2964
2965         case IPV6_2292HOPLIMIT:
2966         case IPV6_HOPLIMIT:
2967         {
2968                 int *hlimp;
2969
2970                 /*
2971                  * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2972                  * to simplify the ordering among hoplimit options.
2973                  */
2974                 if (optname == IPV6_HOPLIMIT && sticky)
2975                         return (ENOPROTOOPT);
2976
2977                 if (len != sizeof(int))
2978                         return (EINVAL);
2979                 hlimp = (int *)buf;
2980                 if (*hlimp < -1 || *hlimp > 255)
2981                         return (EINVAL);
2982
2983                 opt->ip6po_hlim = *hlimp;
2984                 break;
2985         }
2986
2987         case IPV6_TCLASS:
2988         {
2989                 int tclass;
2990
2991                 if (len != sizeof(int))
2992                         return (EINVAL);
2993                 tclass = *(int *)buf;
2994                 if (tclass < -1 || tclass > 255)
2995                         return (EINVAL);
2996
2997                 opt->ip6po_tclass = tclass;
2998                 break;
2999         }
3000
3001         case IPV6_2292NEXTHOP:
3002         case IPV6_NEXTHOP:
3003                 if (cred != NULL) {
3004                         error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
3005                         if (error)
3006                                 return (error);
3007                 }
3008
3009                 if (len == 0) { /* just remove the option */
3010                         ip6_clearpktopts(opt, IPV6_NEXTHOP);
3011                         break;
3012                 }
3013
3014                 /* check if cmsg_len is large enough for sa_len */
3015                 if (len < sizeof(struct sockaddr) || len < *buf)
3016                         return (EINVAL);
3017
3018                 switch (((struct sockaddr *)buf)->sa_family) {
3019                 case AF_INET6:
3020                 {
3021                         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
3022                         int error;
3023
3024                         if (sa6->sin6_len != sizeof(struct sockaddr_in6))
3025                                 return (EINVAL);
3026
3027                         if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
3028                             IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
3029                                 return (EINVAL);
3030                         }
3031                         if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
3032                             != 0) {
3033                                 return (error);
3034                         }
3035                         break;
3036                 }
3037                 case AF_LINK:   /* should eventually be supported */
3038                 default:
3039                         return (EAFNOSUPPORT);
3040                 }
3041
3042                 /* turn off the previous option, then set the new option. */
3043                 ip6_clearpktopts(opt, IPV6_NEXTHOP);
3044                 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
3045                 if (opt->ip6po_nexthop == NULL)
3046                         return (ENOBUFS);
3047                 bcopy(buf, opt->ip6po_nexthop, *buf);
3048                 break;
3049
3050         case IPV6_2292HOPOPTS:
3051         case IPV6_HOPOPTS:
3052         {
3053                 struct ip6_hbh *hbh;
3054                 int hbhlen;
3055
3056                 /*
3057                  * XXX: We don't allow a non-privileged user to set ANY HbH
3058                  * options, since per-option restriction has too much
3059                  * overhead.
3060                  */
3061                 if (cred != NULL) {
3062                         error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
3063                         if (error)
3064                                 return (error);
3065                 }
3066
3067                 if (len == 0) {
3068                         ip6_clearpktopts(opt, IPV6_HOPOPTS);
3069                         break;  /* just remove the option */
3070                 }
3071
3072                 /* message length validation */
3073                 if (len < sizeof(struct ip6_hbh))
3074                         return (EINVAL);
3075                 hbh = (struct ip6_hbh *)buf;
3076                 hbhlen = (hbh->ip6h_len + 1) << 3;
3077                 if (len != hbhlen)
3078                         return (EINVAL);
3079
3080                 /* turn off the previous option, then set the new option. */
3081                 ip6_clearpktopts(opt, IPV6_HOPOPTS);
3082                 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
3083                 if (opt->ip6po_hbh == NULL)
3084                         return (ENOBUFS);
3085                 bcopy(hbh, opt->ip6po_hbh, hbhlen);
3086
3087                 break;
3088         }
3089
3090         case IPV6_2292DSTOPTS:
3091         case IPV6_DSTOPTS:
3092         case IPV6_RTHDRDSTOPTS:
3093         {
3094                 struct ip6_dest *dest, **newdest = NULL;
3095                 int destlen;
3096
3097                 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
3098                         error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
3099                         if (error)
3100                                 return (error);
3101                 }
3102
3103                 if (len == 0) {
3104                         ip6_clearpktopts(opt, optname);
3105                         break;  /* just remove the option */
3106                 }
3107
3108                 /* message length validation */
3109                 if (len < sizeof(struct ip6_dest))
3110                         return (EINVAL);
3111                 dest = (struct ip6_dest *)buf;
3112                 destlen = (dest->ip6d_len + 1) << 3;
3113                 if (len != destlen)
3114                         return (EINVAL);
3115
3116                 /*
3117                  * Determine the position that the destination options header
3118                  * should be inserted; before or after the routing header.
3119                  */
3120                 switch (optname) {
3121                 case IPV6_2292DSTOPTS:
3122                         /*
3123                          * The old advacned API is ambiguous on this point.
3124                          * Our approach is to determine the position based
3125                          * according to the existence of a routing header.
3126                          * Note, however, that this depends on the order of the
3127                          * extension headers in the ancillary data; the 1st
3128                          * part of the destination options header must appear
3129                          * before the routing header in the ancillary data,
3130                          * too.
3131                          * RFC3542 solved the ambiguity by introducing
3132                          * separate ancillary data or option types.
3133                          */
3134                         if (opt->ip6po_rthdr == NULL)
3135                                 newdest = &opt->ip6po_dest1;
3136                         else
3137                                 newdest = &opt->ip6po_dest2;
3138                         break;
3139                 case IPV6_RTHDRDSTOPTS:
3140                         newdest = &opt->ip6po_dest1;
3141                         break;
3142                 case IPV6_DSTOPTS:
3143                         newdest = &opt->ip6po_dest2;
3144                         break;
3145                 }
3146
3147                 /* turn off the previous option, then set the new option. */
3148                 ip6_clearpktopts(opt, optname);
3149                 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
3150                 if (*newdest == NULL)
3151                         return (ENOBUFS);
3152                 bcopy(dest, *newdest, destlen);
3153
3154                 break;
3155         }
3156
3157         case IPV6_2292RTHDR:
3158         case IPV6_RTHDR:
3159         {
3160                 struct ip6_rthdr *rth;
3161                 int rthlen;
3162
3163                 if (len == 0) {
3164                         ip6_clearpktopts(opt, IPV6_RTHDR);
3165                         break;  /* just remove the option */
3166                 }
3167
3168                 /* message length validation */
3169                 if (len < sizeof(struct ip6_rthdr))
3170                         return (EINVAL);
3171                 rth = (struct ip6_rthdr *)buf;
3172                 rthlen = (rth->ip6r_len + 1) << 3;
3173                 if (len != rthlen)
3174                         return (EINVAL);
3175
3176                 switch (rth->ip6r_type) {
3177                 case IPV6_RTHDR_TYPE_0:
3178                         if (rth->ip6r_len == 0) /* must contain one addr */
3179                                 return (EINVAL);
3180                         if (rth->ip6r_len % 2) /* length must be even */
3181                                 return (EINVAL);
3182                         if (rth->ip6r_len / 2 != rth->ip6r_segleft)
3183                                 return (EINVAL);
3184                         break;
3185                 default:
3186                         return (EINVAL);        /* not supported */
3187                 }
3188
3189                 /* turn off the previous option */
3190                 ip6_clearpktopts(opt, IPV6_RTHDR);
3191                 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
3192                 if (opt->ip6po_rthdr == NULL)
3193                         return (ENOBUFS);
3194                 bcopy(rth, opt->ip6po_rthdr, rthlen);
3195
3196                 break;
3197         }
3198
3199         case IPV6_USE_MIN_MTU:
3200                 if (len != sizeof(int))
3201                         return (EINVAL);
3202                 minmtupolicy = *(int *)buf;
3203                 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
3204                     minmtupolicy != IP6PO_MINMTU_DISABLE &&
3205                     minmtupolicy != IP6PO_MINMTU_ALL) {
3206                         return (EINVAL);
3207                 }
3208                 opt->ip6po_minmtu = minmtupolicy;
3209                 break;
3210
3211         case IPV6_DONTFRAG:
3212                 if (len != sizeof(int))
3213                         return (EINVAL);
3214
3215                 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
3216                         /*
3217                          * we ignore this option for TCP sockets.
3218                          * (RFC3542 leaves this case unspecified.)
3219                          */
3220                         opt->ip6po_flags &= ~IP6PO_DONTFRAG;
3221                 } else
3222                         opt->ip6po_flags |= IP6PO_DONTFRAG;
3223                 break;
3224
3225         case IPV6_PREFER_TEMPADDR:
3226                 if (len != sizeof(int))
3227                         return (EINVAL);
3228                 preftemp = *(int *)buf;
3229                 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
3230                     preftemp != IP6PO_TEMPADDR_NOTPREFER &&
3231                     preftemp != IP6PO_TEMPADDR_PREFER) {
3232                         return (EINVAL);
3233                 }
3234                 opt->ip6po_prefer_tempaddr = preftemp;
3235                 break;
3236
3237         default:
3238                 return (ENOPROTOOPT);
3239         } /* end of switch */
3240
3241         return (0);
3242 }
3243
3244 /*
3245  * Routine called from ip6_output() to loop back a copy of an IP6 multicast
3246  * packet to the input queue of a specified interface.  Note that this
3247  * calls the output routine of the loopback "driver", but with an interface
3248  * pointer that might NOT be &loif -- easier than replicating that code here.
3249  */
3250 void
3251 ip6_mloopback(struct ifnet *ifp, struct mbuf *m)
3252 {
3253         struct mbuf *copym;
3254         struct ip6_hdr *ip6;
3255
3256         copym = m_copym(m, 0, M_COPYALL, M_NOWAIT);
3257         if (copym == NULL)
3258                 return;
3259
3260         /*
3261          * Make sure to deep-copy IPv6 header portion in case the data
3262          * is in an mbuf cluster, so that we can safely override the IPv6
3263          * header portion later.
3264          */
3265         if (!M_WRITABLE(copym) ||
3266             copym->m_len < sizeof(struct ip6_hdr)) {
3267                 copym = m_pullup(copym, sizeof(struct ip6_hdr));
3268                 if (copym == NULL)
3269                         return;
3270         }
3271         ip6 = mtod(copym, struct ip6_hdr *);
3272         /*
3273          * clear embedded scope identifiers if necessary.
3274          * in6_clearscope will touch the addresses only when necessary.
3275          */
3276         in6_clearscope(&ip6->ip6_src);
3277         in6_clearscope(&ip6->ip6_dst);
3278         if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
3279                 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 |
3280                     CSUM_PSEUDO_HDR;
3281                 copym->m_pkthdr.csum_data = 0xffff;
3282         }
3283         if_simloop(ifp, copym, AF_INET6, 0);
3284 }
3285
3286 /*
3287  * Chop IPv6 header off from the payload.
3288  */
3289 static int
3290 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
3291 {
3292         struct mbuf *mh;
3293         struct ip6_hdr *ip6;
3294
3295         ip6 = mtod(m, struct ip6_hdr *);
3296         if (m->m_len > sizeof(*ip6)) {
3297                 mh = m_gethdr(M_NOWAIT, MT_DATA);
3298                 if (mh == NULL) {
3299                         m_freem(m);
3300                         return ENOBUFS;
3301                 }
3302                 m_move_pkthdr(mh, m);
3303                 M_ALIGN(mh, sizeof(*ip6));
3304                 m->m_len -= sizeof(*ip6);
3305                 m->m_data += sizeof(*ip6);
3306                 mh->m_next = m;
3307                 m = mh;
3308                 m->m_len = sizeof(*ip6);
3309                 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
3310         }
3311         exthdrs->ip6e_ip6 = m;
3312         return 0;
3313 }
3314
3315 /*
3316  * Compute IPv6 extension header length.
3317  */
3318 int
3319 ip6_optlen(struct inpcb *inp)
3320 {
3321         int len;
3322
3323         if (!inp->in6p_outputopts)
3324                 return 0;
3325
3326         len = 0;
3327 #define elen(x) \
3328     (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3329
3330         len += elen(inp->in6p_outputopts->ip6po_hbh);
3331         if (inp->in6p_outputopts->ip6po_rthdr)
3332                 /* dest1 is valid with rthdr only */
3333                 len += elen(inp->in6p_outputopts->ip6po_dest1);
3334         len += elen(inp->in6p_outputopts->ip6po_rthdr);
3335         len += elen(inp->in6p_outputopts->ip6po_dest2);
3336         return len;
3337 #undef elen
3338 }