sys/netinet6/ip6_output.c

   1 /*-
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $
  30  */
  31
  32 /*-
  33  * Copyright (c) 1982, 1986, 1988, 1990, 1993
  34  *      The Regents of the University of California.  All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)ip_output.c 8.3 (Berkeley) 1/21/94
  61  */
  62
  63 #include <sys/cdefs.h>
  64 __FBSDID("$FreeBSD$");
  65
  66 #include "opt_inet.h"
  67 #include "opt_inet6.h"
  68 #include "opt_ipfw.h"
  69 #include "opt_ipsec.h"
  70 #include "opt_sctp.h"
  71 #include "opt_route.h"
  72 #include "opt_rss.h"
  73
  74 #include <sys/param.h>
  75 #include <sys/kernel.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/netisr.h>
  92 #include <net/route.h>
  93 #include <net/pfil.h>
  94 #include <net/vnet.h>
  95
  96 #include <netinet/in.h>
  97 #include <netinet/in_var.h>
  98 #include <netinet/ip_var.h>
  99 #include <netinet6/in6_var.h>
 100 #include <netinet/ip6.h>
 101 #include <netinet/icmp6.h>
 102 #include <netinet6/ip6_var.h>
 103 #include <netinet/in_pcb.h>
 104 #include <netinet/tcp_var.h>
 105 #include <netinet6/nd6.h>
 106 #include <netinet/in_rss.h>
 107
 108 #ifdef IPSEC
 109 #include <netipsec/ipsec.h>
 110 #include <netipsec/ipsec6.h>
 111 #include <netipsec/key.h>
 112 #include <netinet6/ip6_ipsec.h>
 113 #endif /* IPSEC */
 114 #ifdef SCTP
 115 #include <netinet/sctp.h>
 116 #include <netinet/sctp_crc32.h>
 117 #endif
 118
 119 #include <netinet6/ip6protosw.h>
 120 #include <netinet6/scope6_var.h>
 121
 122 #ifdef FLOWTABLE
 123 #include <net/flowtable.h>
 124 #endif
 125
 126 extern int in6_mcast_loop;
 127
 128 struct ip6_exthdrs {
 129         struct mbuf *ip6e_ip6;
 130         struct mbuf *ip6e_hbh;
 131         struct mbuf *ip6e_dest1;
 132         struct mbuf *ip6e_rthdr;
 133         struct mbuf *ip6e_dest2;
 134 };
 135
 136 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
 137                            struct ucred *, int);
 138 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
 139         struct socket *, struct sockopt *);
 140 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *);
 141 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
 142         struct ucred *, int, int, int);
 143
 144 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
 145 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
 146         struct ip6_frag **);
 147 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
 148 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
 149 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *,
 150         struct ifnet *, struct in6_addr *, u_long *, int *, u_int);
 151 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
 152
 153
 154 /*
 155  * Make an extension header from option data.  hp is the source, and
 156  * mp is the destination.
 157  */
 158 #define MAKE_EXTHDR(hp, mp)                                             \
 159     do {                                                                \
 160         if (hp) {                                                       \
 161                 struct ip6_ext *eh = (struct ip6_ext *)(hp);            \
 162                 error = ip6_copyexthdr((mp), (caddr_t)(hp),             \
 163                     ((eh)->ip6e_len + 1) << 3);                         \
 164                 if (error)                                              \
 165                         goto freehdrs;                                  \
 166         }                                                               \
 167     } while (/*CONSTCOND*/ 0)
 168
 169 /*
 170  * Form a chain of extension headers.
 171  * m is the extension header mbuf
 172  * mp is the previous mbuf in the chain
 173  * p is the next header
 174  * i is the type of option.
 175  */
 176 #define MAKE_CHAIN(m, mp, p, i)\
 177     do {\
 178         if (m) {\
 179                 if (!hdrsplit) \
 180                         panic("assumption failed: hdr not split"); \
 181                 *mtod((m), u_char *) = *(p);\
 182                 *(p) = (i);\
 183                 p = mtod((m), u_char *);\
 184                 (m)->m_next = (mp)->m_next;\
 185                 (mp)->m_next = (m);\
 186                 (mp) = (m);\
 187         }\
 188     } while (/*CONSTCOND*/ 0)
 189
 190 void
 191 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
 192 {
 193         u_short csum;
 194
 195         csum = in_cksum_skip(m, offset + plen, offset);
 196         if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
 197                 csum = 0xffff;
 198         offset += m->m_pkthdr.csum_data;        /* checksum offset */
 199
 200         if (offset + sizeof(u_short) > m->m_len) {
 201                 printf("%s: delayed m_pullup, m->len: %d plen %u off %u "
 202                     "csum_flags=%b\n", __func__, m->m_len, plen, offset,
 203                     (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 204                 /*
 205                  * XXX this should not happen, but if it does, the correct
 206                  * behavior may be to insert the checksum in the appropriate
 207                  * next mbuf in the chain.
 208                  */
 209                 return;
 210         }
 211         *(u_short *)(m->m_data + offset) = csum;
 212 }
 213
 214 /*
 215  * IP6 output. The packet in mbuf chain m contains a skeletal IP6
 216  * header (with pri, len, nxt, hlim, src, dst).
 217  * This function may modify ver and hlim only.
 218  * The mbuf chain containing the packet will be freed.
 219  * The mbuf opt, if present, will not be freed.
 220  * If route_in6 ro is present and has ro_rt initialized, route lookup would be
 221  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
 222  * then result of route lookup is stored in ro->ro_rt.
 223  *
 224  * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and
 225  * nd_ifinfo.linkmtu is u_int32_t.  so we use u_long to hold largest one,
 226  * which is rt_mtu.
 227  *
 228  * ifpp - XXX: just for statistics
 229  */
 230 int
 231 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
 232     struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
 233     struct ifnet **ifpp, struct inpcb *inp)
 234 {
 235         struct ip6_hdr *ip6, *mhip6;
 236         struct ifnet *ifp, *origifp;
 237         struct mbuf *m = m0;
 238         struct mbuf *mprev = NULL;
 239         int hlen, tlen, len, off;
 240         struct route_in6 ip6route;
 241         struct rtentry *rt = NULL;
 242         struct sockaddr_in6 *dst, src_sa, dst_sa;
 243         struct in6_addr odst;
 244         int error = 0;
 245         struct in6_ifaddr *ia = NULL;
 246         u_long mtu;
 247         int alwaysfrag, dontfrag;
 248         u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
 249         struct ip6_exthdrs exthdrs;
 250         struct in6_addr finaldst, src0, dst0;
 251         u_int32_t zone;
 252         struct route_in6 *ro_pmtu = NULL;
 253         int hdrsplit = 0;
 254         int sw_csum, tso;
 255         struct m_tag *fwd_tag = NULL;
 256
 257         ip6 = mtod(m, struct ip6_hdr *);
 258         if (ip6 == NULL) {
 259                 printf ("ip6 is NULL");
 260                 goto bad;
 261         }
 262
 263         if (inp != NULL)
 264                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 265
 266         finaldst = ip6->ip6_dst;
 267         bzero(&exthdrs, sizeof(exthdrs));
 268         if (opt) {
 269                 /* Hop-by-Hop options header */
 270                 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
 271                 /* Destination options header(1st part) */
 272                 if (opt->ip6po_rthdr) {
 273                         /*
 274                          * Destination options header(1st part)
 275                          * This only makes sense with a routing header.
 276                          * See Section 9.2 of RFC 3542.
 277                          * Disabling this part just for MIP6 convenience is
 278                          * a bad idea.  We need to think carefully about a
 279                          * way to make the advanced API coexist with MIP6
 280                          * options, which might automatically be inserted in
 281                          * the kernel.
 282                          */
 283                         MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
 284                 }
 285                 /* Routing header */
 286                 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
 287                 /* Destination options header(2nd part) */
 288                 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
 289         }
 290
 291 #ifdef IPSEC
 292         /*
 293          * IPSec checking which handles several cases.
 294          * FAST IPSEC: We re-injected the packet.
 295          */
 296         switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp))
 297         {
 298         case 1:                 /* Bad packet */
 299                 goto freehdrs;
 300         case -1:                /* IPSec done */
 301                 goto done;
 302         case 0:                 /* No IPSec */
 303         default:
 304                 break;
 305         }
 306 #endif /* IPSEC */
 307
 308         /*
 309          * Calculate the total length of the extension header chain.
 310          * Keep the length of the unfragmentable part for fragmentation.
 311          */
 312         optlen = 0;
 313         if (exthdrs.ip6e_hbh)
 314                 optlen += exthdrs.ip6e_hbh->m_len;
 315         if (exthdrs.ip6e_dest1)
 316                 optlen += exthdrs.ip6e_dest1->m_len;
 317         if (exthdrs.ip6e_rthdr)
 318                 optlen += exthdrs.ip6e_rthdr->m_len;
 319         unfragpartlen = optlen + sizeof(struct ip6_hdr);
 320
 321         /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */
 322         if (exthdrs.ip6e_dest2)
 323                 optlen += exthdrs.ip6e_dest2->m_len;
 324
 325         /*
 326          * If there is at least one extension header,
 327          * separate IP6 header from the payload.
 328          */
 329         if (optlen && !hdrsplit) {
 330                 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
 331                         m = NULL;
 332                         goto freehdrs;
 333                 }
 334                 m = exthdrs.ip6e_ip6;
 335                 hdrsplit++;
 336         }
 337
 338         /* adjust pointer */
 339         ip6 = mtod(m, struct ip6_hdr *);
 340
 341         /* adjust mbuf packet header length */
 342         m->m_pkthdr.len += optlen;
 343         plen = m->m_pkthdr.len - sizeof(*ip6);
 344
 345         /* If this is a jumbo payload, insert a jumbo payload option. */
 346         if (plen > IPV6_MAXPACKET) {
 347                 if (!hdrsplit) {
 348                         if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
 349                                 m = NULL;
 350                                 goto freehdrs;
 351                         }
 352                         m = exthdrs.ip6e_ip6;
 353                         hdrsplit++;
 354                 }
 355                 /* adjust pointer */
 356                 ip6 = mtod(m, struct ip6_hdr *);
 357                 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
 358                         goto freehdrs;
 359                 ip6->ip6_plen = 0;
 360         } else
 361                 ip6->ip6_plen = htons(plen);
 362
 363         /*
 364          * Concatenate headers and fill in next header fields.
 365          * Here we have, on "m"
 366          *      IPv6 payload
 367          * and we insert headers accordingly.  Finally, we should be getting:
 368          *      IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
 369          *
 370          * during the header composing process, "m" points to IPv6 header.
 371          * "mprev" points to an extension header prior to esp.
 372          */
 373         u_char *nexthdrp = &ip6->ip6_nxt;
 374         mprev = m;
 375
 376         /*
 377          * we treat dest2 specially.  this makes IPsec processing
 378          * much easier.  the goal here is to make mprev point the
 379          * mbuf prior to dest2.
 380          *
 381          * result: IPv6 dest2 payload
 382          * m and mprev will point to IPv6 header.
 383          */
 384         if (exthdrs.ip6e_dest2) {
 385                 if (!hdrsplit)
 386                         panic("assumption failed: hdr not split");
 387                 exthdrs.ip6e_dest2->m_next = m->m_next;
 388                 m->m_next = exthdrs.ip6e_dest2;
 389                 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
 390                 ip6->ip6_nxt = IPPROTO_DSTOPTS;
 391         }
 392
 393         /*
 394          * result: IPv6 hbh dest1 rthdr dest2 payload
 395          * m will point to IPv6 header.  mprev will point to the
 396          * extension header prior to dest2 (rthdr in the above case).
 397          */
 398         MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
 399         MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
 400                    IPPROTO_DSTOPTS);
 401         MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
 402                    IPPROTO_ROUTING);
 403
 404         /*
 405          * If there is a routing header, discard the packet.
 406          */
 407         if (exthdrs.ip6e_rthdr) {
 408                  error = EINVAL;
 409                  goto bad;
 410         }
 411
 412         /* Source address validation */
 413         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
 414             (flags & IPV6_UNSPECSRC) == 0) {
 415                 error = EOPNOTSUPP;
 416                 IP6STAT_INC(ip6s_badscope);
 417                 goto bad;
 418         }
 419         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
 420                 error = EOPNOTSUPP;
 421                 IP6STAT_INC(ip6s_badscope);
 422                 goto bad;
 423         }
 424
 425         IP6STAT_INC(ip6s_localout);
 426
 427         /*
 428          * Route packet.
 429          */
 430         if (ro == 0) {
 431                 ro = &ip6route;
 432                 bzero((caddr_t)ro, sizeof(*ro));
 433         }
 434         ro_pmtu = ro;
 435         if (opt && opt->ip6po_rthdr)
 436                 ro = &opt->ip6po_route;
 437         dst = (struct sockaddr_in6 *)&ro->ro_dst;
 438 #ifdef FLOWTABLE
 439         if (ro->ro_rt == NULL)
 440                 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro);
 441 #endif
 442 again:
 443         /*
 444          * if specified, try to fill in the traffic class field.
 445          * do not override if a non-zero value is already set.
 446          * we check the diffserv field and the ecn field separately.
 447          */
 448         if (opt && opt->ip6po_tclass >= 0) {
 449                 int mask = 0;
 450
 451                 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
 452                         mask |= 0xfc;
 453                 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
 454                         mask |= 0x03;
 455                 if (mask != 0)
 456                         ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
 457         }
 458
 459         /* fill in or override the hop limit field, if necessary. */
 460         if (opt && opt->ip6po_hlim != -1)
 461                 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
 462         else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 463                 if (im6o != NULL)
 464                         ip6->ip6_hlim = im6o->im6o_multicast_hlim;
 465                 else
 466                         ip6->ip6_hlim = V_ip6_defmcasthlim;
 467         }
 468
 469         /* adjust pointer */
 470         ip6 = mtod(m, struct ip6_hdr *);
 471
 472         if (ro->ro_rt && fwd_tag == NULL) {
 473                 rt = ro->ro_rt;
 474                 ifp = ro->ro_rt->rt_ifp;
 475         } else {
 476                 if (fwd_tag == NULL) {
 477                         bzero(&dst_sa, sizeof(dst_sa));
 478                         dst_sa.sin6_family = AF_INET6;
 479                         dst_sa.sin6_len = sizeof(dst_sa);
 480                         dst_sa.sin6_addr = ip6->ip6_dst;
 481                 }
 482                 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
 483                     &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m));
 484                 if (error != 0) {
 485                         if (ifp != NULL)
 486                                 in6_ifstat_inc(ifp, ifs6_out_discard);
 487                         goto bad;
 488                 }
 489         }
 490         if (rt == NULL) {
 491                 /*
 492                  * If in6_selectroute() does not return a route entry,
 493                  * dst may not have been updated.
 494                  */
 495                 *dst = dst_sa;  /* XXX */
 496         }
 497
 498         /*
 499          * then rt (for unicast) and ifp must be non-NULL valid values.
 500          */
 501         if ((flags & IPV6_FORWARDING) == 0) {
 502                 /* XXX: the FORWARDING flag can be set for mrouting. */
 503                 in6_ifstat_inc(ifp, ifs6_out_request);
 504         }
 505         if (rt != NULL) {
 506                 ia = (struct in6_ifaddr *)(rt->rt_ifa);
 507                 counter_u64_add(rt->rt_pksent, 1);
 508         }
 509
 510
 511         /*
 512          * The outgoing interface must be in the zone of source and
 513          * destination addresses.
 514          */
 515         origifp = ifp;
 516
 517         src0 = ip6->ip6_src;
 518         if (in6_setscope(&src0, origifp, &zone))
 519                 goto badscope;
 520         bzero(&src_sa, sizeof(src_sa));
 521         src_sa.sin6_family = AF_INET6;
 522         src_sa.sin6_len = sizeof(src_sa);
 523         src_sa.sin6_addr = ip6->ip6_src;
 524         if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
 525                 goto badscope;
 526
 527         dst0 = ip6->ip6_dst;
 528         if (in6_setscope(&dst0, origifp, &zone))
 529                 goto badscope;
 530         /* re-initialize to be sure */
 531         bzero(&dst_sa, sizeof(dst_sa));
 532         dst_sa.sin6_family = AF_INET6;
 533         dst_sa.sin6_len = sizeof(dst_sa);
 534         dst_sa.sin6_addr = ip6->ip6_dst;
 535         if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
 536                 goto badscope;
 537         }
 538
 539         /* We should use ia_ifp to support the case of
 540          * sending packets to an address of our own.
 541          */
 542         if (ia != NULL && ia->ia_ifp)
 543                 ifp = ia->ia_ifp;
 544
 545         /* scope check is done. */
 546         goto routefound;
 547
 548   badscope:
 549         IP6STAT_INC(ip6s_badscope);
 550         in6_ifstat_inc(origifp, ifs6_out_discard);
 551         if (error == 0)
 552                 error = EHOSTUNREACH; /* XXX */
 553         goto bad;
 554
 555   routefound:
 556         if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 557                 if (opt && opt->ip6po_nextroute.ro_rt) {
 558                         /*
 559                          * The nexthop is explicitly specified by the
 560                          * application.  We assume the next hop is an IPv6
 561                          * address.
 562                          */
 563                         dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
 564                 }
 565                 else if ((rt->rt_flags & RTF_GATEWAY))
 566                         dst = (struct sockaddr_in6 *)rt->rt_gateway;
 567         }
 568
 569         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 570                 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
 571         } else {
 572                 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
 573                 in6_ifstat_inc(ifp, ifs6_out_mcast);
 574                 /*
 575                  * Confirm that the outgoing interface supports multicast.
 576                  */
 577                 if (!(ifp->if_flags & IFF_MULTICAST)) {
 578                         IP6STAT_INC(ip6s_noroute);
 579                         in6_ifstat_inc(ifp, ifs6_out_discard);
 580                         error = ENETUNREACH;
 581                         goto bad;
 582                 }
 583                 if ((im6o == NULL && in6_mcast_loop) ||
 584                     (im6o && im6o->im6o_multicast_loop)) {
 585                         /*
 586                          * Loop back multicast datagram if not expressly
 587                          * forbidden to do so, even if we have not joined
 588                          * the address; protocols will filter it later,
 589                          * thus deferring a hash lookup and lock acquisition
 590                          * at the expense of an m_copym().
 591                          */
 592                         ip6_mloopback(ifp, m, dst);
 593                 } else {
 594                         /*
 595                          * If we are acting as a multicast router, perform
 596                          * multicast forwarding as if the packet had just
 597                          * arrived on the interface to which we are about
 598                          * to send.  The multicast forwarding function
 599                          * recursively calls this function, using the
 600                          * IPV6_FORWARDING flag to prevent infinite recursion.
 601                          *
 602                          * Multicasts that are looped back by ip6_mloopback(),
 603                          * above, will be forwarded by the ip6_input() routine,
 604                          * if necessary.
 605                          */
 606                         if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
 607                                 /*
 608                                  * XXX: ip6_mforward expects that rcvif is NULL
 609                                  * when it is called from the originating path.
 610                                  * However, it may not always be the case.
 611                                  */
 612                                 m->m_pkthdr.rcvif = NULL;
 613                                 if (ip6_mforward(ip6, ifp, m) != 0) {
 614                                         m_freem(m);
 615                                         goto done;
 616                                 }
 617                         }
 618                 }
 619                 /*
 620                  * Multicasts with a hoplimit of zero may be looped back,
 621                  * above, but must not be transmitted on a network.
 622                  * Also, multicasts addressed to the loopback interface
 623                  * are not sent -- the above call to ip6_mloopback() will
 624                  * loop back a copy if this host actually belongs to the
 625                  * destination group on the loopback interface.
 626                  */
 627                 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
 628                     IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
 629                         m_freem(m);
 630                         goto done;
 631                 }
 632         }
 633
 634         /*
 635          * Fill the outgoing inteface to tell the upper layer
 636          * to increment per-interface statistics.
 637          */
 638         if (ifpp)
 639                 *ifpp = ifp;
 640
 641         /* Determine path MTU. */
 642         if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
 643             &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0)
 644                 goto bad;
 645
 646         /*
 647          * The caller of this function may specify to use the minimum MTU
 648          * in some cases.
 649          * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
 650          * setting.  The logic is a bit complicated; by default, unicast
 651          * packets will follow path MTU while multicast packets will be sent at
 652          * the minimum MTU.  If IP6PO_MINMTU_ALL is specified, all packets
 653          * including unicast ones will be sent at the minimum MTU.  Multicast
 654          * packets will always be sent at the minimum MTU unless
 655          * IP6PO_MINMTU_DISABLE is explicitly specified.
 656          * See RFC 3542 for more details.
 657          */
 658         if (mtu > IPV6_MMTU) {
 659                 if ((flags & IPV6_MINMTU))
 660                         mtu = IPV6_MMTU;
 661                 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
 662                         mtu = IPV6_MMTU;
 663                 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
 664                          (opt == NULL ||
 665                           opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
 666                         mtu = IPV6_MMTU;
 667                 }
 668         }
 669
 670         /*
 671          * clear embedded scope identifiers if necessary.
 672          * in6_clearscope will touch the addresses only when necessary.
 673          */
 674         in6_clearscope(&ip6->ip6_src);
 675         in6_clearscope(&ip6->ip6_dst);
 676
 677         /*
 678          * If the outgoing packet contains a hop-by-hop options header,
 679          * it must be examined and processed even by the source node.
 680          * (RFC 2460, section 4.)
 681          */
 682         if (exthdrs.ip6e_hbh) {
 683                 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
 684                 u_int32_t dummy; /* XXX unused */
 685                 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
 686
 687 #ifdef DIAGNOSTIC
 688                 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
 689                         panic("ip6e_hbh is not contiguous");
 690 #endif
 691                 /*
 692                  *  XXX: if we have to send an ICMPv6 error to the sender,
 693                  *       we need the M_LOOP flag since icmp6_error() expects
 694                  *       the IPv6 and the hop-by-hop options header are
 695                  *       contiguous unless the flag is set.
 696                  */
 697                 m->m_flags |= M_LOOP;
 698                 m->m_pkthdr.rcvif = ifp;
 699                 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
 700                     ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
 701                     &dummy, &plen) < 0) {
 702                         /* m was already freed at this point */
 703                         error = EINVAL;/* better error? */
 704                         goto done;
 705                 }
 706                 m->m_flags &= ~M_LOOP; /* XXX */
 707                 m->m_pkthdr.rcvif = NULL;
 708         }
 709
 710         /* Jump over all PFIL processing if hooks are not active. */
 711         if (!PFIL_HOOKED(&V_inet6_pfil_hook))
 712                 goto passout;
 713
 714         odst = ip6->ip6_dst;
 715         /* Run through list of hooks for output packets. */
 716         error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp);
 717         if (error != 0 || m == NULL)
 718                 goto done;
 719         ip6 = mtod(m, struct ip6_hdr *);
 720
 721         /* See if destination IP address was changed by packet filter. */
 722         if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
 723                 m->m_flags |= M_SKIP_FIREWALL;
 724                 /* If destination is now ourself drop to ip6_input(). */
 725                 if (in6_localip(&ip6->ip6_dst)) {
 726                         m->m_flags |= M_FASTFWD_OURS;
 727                         if (m->m_pkthdr.rcvif == NULL)
 728                                 m->m_pkthdr.rcvif = V_loif;
 729                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
 730                                 m->m_pkthdr.csum_flags |=
 731                                     CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
 732                                 m->m_pkthdr.csum_data = 0xffff;
 733                         }
 734 #ifdef SCTP
 735                         if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
 736                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 737 #endif
 738                         error = netisr_queue(NETISR_IPV6, m);
 739                         goto done;
 740                 } else
 741                         goto again;     /* Redo the routing table lookup. */
 742         }
 743
 744         /* See if local, if yes, send it to netisr. */
 745         if (m->m_flags & M_FASTFWD_OURS) {
 746                 if (m->m_pkthdr.rcvif == NULL)
 747                         m->m_pkthdr.rcvif = V_loif;
 748                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
 749                         m->m_pkthdr.csum_flags |=
 750                             CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
 751                         m->m_pkthdr.csum_data = 0xffff;
 752                 }
 753 #ifdef SCTP
 754                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
 755                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 756 #endif
 757                 error = netisr_queue(NETISR_IPV6, m);
 758                 goto done;
 759         }
 760         /* Or forward to some other address? */
 761         if ((m->m_flags & M_IP6_NEXTHOP) &&
 762             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 763                 dst = (struct sockaddr_in6 *)&ro->ro_dst;
 764                 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
 765                 m->m_flags |= M_SKIP_FIREWALL;
 766                 m->m_flags &= ~M_IP6_NEXTHOP;
 767                 m_tag_delete(m, fwd_tag);
 768                 goto again;
 769         }
 770
 771 passout:
 772         /*
 773          * Send the packet to the outgoing interface.
 774          * If necessary, do IPv6 fragmentation before sending.
 775          *
 776          * the logic here is rather complex:
 777          * 1: normal case (dontfrag == 0, alwaysfrag == 0)
 778          * 1-a: send as is if tlen <= path mtu
 779          * 1-b: fragment if tlen > path mtu
 780          *
 781          * 2: if user asks us not to fragment (dontfrag == 1)
 782          * 2-a: send as is if tlen <= interface mtu
 783          * 2-b: error if tlen > interface mtu
 784          *
 785          * 3: if we always need to attach fragment header (alwaysfrag == 1)
 786          *      always fragment
 787          *
 788          * 4: if dontfrag == 1 && alwaysfrag == 1
 789          *      error, as we cannot handle this conflicting request
 790          */
 791         sw_csum = m->m_pkthdr.csum_flags;
 792         if (!hdrsplit) {
 793                 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0;
 794                 sw_csum &= ~ifp->if_hwassist;
 795         } else
 796                 tso = 0;
 797         /*
 798          * If we added extension headers, we will not do TSO and calculate the
 799          * checksums ourselves for now.
 800          * XXX-BZ  Need a framework to know when the NIC can handle it, even
 801          * with ext. hdrs.
 802          */
 803         if (sw_csum & CSUM_DELAY_DATA_IPV6) {
 804                 sw_csum &= ~CSUM_DELAY_DATA_IPV6;
 805                 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
 806         }
 807 #ifdef SCTP
 808         if (sw_csum & CSUM_SCTP_IPV6) {
 809                 sw_csum &= ~CSUM_SCTP_IPV6;
 810                 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
 811         }
 812 #endif
 813         m->m_pkthdr.csum_flags &= ifp->if_hwassist;
 814         tlen = m->m_pkthdr.len;
 815
 816         if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
 817                 dontfrag = 1;
 818         else
 819                 dontfrag = 0;
 820         if (dontfrag && alwaysfrag) {   /* case 4 */
 821                 /* conflicting request - can't transmit */
 822                 error = EMSGSIZE;
 823                 goto bad;
 824         }
 825         if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) {      /* case 2-b */
 826                 /*
 827                  * Even if the DONTFRAG option is specified, we cannot send the
 828                  * packet when the data length is larger than the MTU of the
 829                  * outgoing interface.
 830                  * Notify the error by sending IPV6_PATHMTU ancillary data as
 831                  * well as returning an error code (the latter is not described
 832                  * in the API spec.)
 833                  */
 834                 u_int32_t mtu32;
 835                 struct ip6ctlparam ip6cp;
 836
 837                 mtu32 = (u_int32_t)mtu;
 838                 bzero(&ip6cp, sizeof(ip6cp));
 839                 ip6cp.ip6c_cmdarg = (void *)&mtu32;
 840                 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
 841                     (void *)&ip6cp);
 842
 843                 error = EMSGSIZE;
 844                 goto bad;
 845         }
 846
 847         /*
 848          * transmit packet without fragmentation
 849          */
 850         if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
 851                 struct in6_ifaddr *ia6;
 852
 853                 ip6 = mtod(m, struct ip6_hdr *);
 854                 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
 855                 if (ia6) {
 856                         /* Record statistics for this interface address. */
 857                         counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
 858                         counter_u64_add(ia6->ia_ifa.ifa_obytes,
 859                             m->m_pkthdr.len);
 860                         ifa_free(&ia6->ia_ifa);
 861                 }
 862                 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
 863                 goto done;
 864         }
 865
 866         /*
 867          * try to fragment the packet.  case 1-b and 3
 868          */
 869         if (mtu < IPV6_MMTU) {
 870                 /* path MTU cannot be less than IPV6_MMTU */
 871                 error = EMSGSIZE;
 872                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
 873                 goto bad;
 874         } else if (ip6->ip6_plen == 0) {
 875                 /* jumbo payload cannot be fragmented */
 876                 error = EMSGSIZE;
 877                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
 878                 goto bad;
 879         } else {
 880                 struct mbuf **mnext, *m_frgpart;
 881                 struct ip6_frag *ip6f;
 882                 u_int32_t id = htonl(ip6_randomid());
 883                 u_char nextproto;
 884
 885                 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len;
 886
 887                 /*
 888                  * Too large for the destination or interface;
 889                  * fragment if possible.
 890                  * Must be able to put at least 8 bytes per fragment.
 891                  */
 892                 hlen = unfragpartlen;
 893                 if (mtu > IPV6_MAXPACKET)
 894                         mtu = IPV6_MAXPACKET;
 895
 896                 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
 897                 if (len < 8) {
 898                         error = EMSGSIZE;
 899                         in6_ifstat_inc(ifp, ifs6_out_fragfail);
 900                         goto bad;
 901                 }
 902
 903                 /*
 904                  * Verify that we have any chance at all of being able to queue
 905                  *      the packet or packet fragments
 906                  */
 907                 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen)
 908                     < tlen  /* - hlen */)) {
 909                         error = ENOBUFS;
 910                         IP6STAT_INC(ip6s_odropped);
 911                         goto bad;
 912                 }
 913
 914
 915                 /*
 916                  * If the interface will not calculate checksums on
 917                  * fragmented packets, then do it here.
 918                  * XXX-BZ handle the hw offloading case.  Need flags.
 919                  */
 920                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
 921                         in6_delayed_cksum(m, plen, hlen);
 922                         m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
 923                 }
 924 #ifdef SCTP
 925                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
 926                         sctp_delayed_cksum(m, hlen);
 927                         m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
 928                 }
 929 #endif
 930                 mnext = &m->m_nextpkt;
 931
 932                 /*
 933                  * Change the next header field of the last header in the
 934                  * unfragmentable part.
 935                  */
 936                 if (exthdrs.ip6e_rthdr) {
 937                         nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
 938                         *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
 939                 } else if (exthdrs.ip6e_dest1) {
 940                         nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
 941                         *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
 942                 } else if (exthdrs.ip6e_hbh) {
 943                         nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
 944                         *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
 945                 } else {
 946                         nextproto = ip6->ip6_nxt;
 947                         ip6->ip6_nxt = IPPROTO_FRAGMENT;
 948                 }
 949
 950                 /*
 951                  * Loop through length of segment after first fragment,
 952                  * make new header and copy data of each part and link onto
 953                  * chain.
 954                  */
 955                 m0 = m;
 956                 for (off = hlen; off < tlen; off += len) {
 957                         m = m_gethdr(M_NOWAIT, MT_DATA);
 958                         if (!m) {
 959                                 error = ENOBUFS;
 960                                 IP6STAT_INC(ip6s_odropped);
 961                                 goto sendorfree;
 962                         }
 963                         m->m_flags = m0->m_flags & M_COPYFLAGS;
 964                         *mnext = m;
 965                         mnext = &m->m_nextpkt;
 966                         m->m_data += max_linkhdr;
 967                         mhip6 = mtod(m, struct ip6_hdr *);
 968                         *mhip6 = *ip6;
 969                         m->m_len = sizeof(*mhip6);
 970                         error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
 971                         if (error) {
 972                                 IP6STAT_INC(ip6s_odropped);
 973                                 goto sendorfree;
 974                         }
 975                         ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
 976                         if (off + len >= tlen)
 977                                 len = tlen - off;
 978                         else
 979                                 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
 980                         mhip6->ip6_plen = htons((u_short)(len + hlen +
 981                             sizeof(*ip6f) - sizeof(struct ip6_hdr)));
 982                         if ((m_frgpart = m_copy(m0, off, len)) == 0) {
 983                                 error = ENOBUFS;
 984                                 IP6STAT_INC(ip6s_odropped);
 985                                 goto sendorfree;
 986                         }
 987                         m_cat(m, m_frgpart);
 988                         m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
 989                         m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
 990                         m->m_pkthdr.rcvif = NULL;
 991                         ip6f->ip6f_reserved = 0;
 992                         ip6f->ip6f_ident = id;
 993                         ip6f->ip6f_nxt = nextproto;
 994                         IP6STAT_INC(ip6s_ofragments);
 995                         in6_ifstat_inc(ifp, ifs6_out_fragcreat);
 996                 }
 997
 998                 in6_ifstat_inc(ifp, ifs6_out_fragok);
 999         }
1000
1001         /*
1002          * Remove leading garbages.
1003          */
1004 sendorfree:
1005         m = m0->m_nextpkt;
1006         m0->m_nextpkt = 0;
1007         m_freem(m0);
1008         for (m0 = m; m; m = m0) {
1009                 m0 = m->m_nextpkt;
1010                 m->m_nextpkt = 0;
1011                 if (error == 0) {
1012                         /* Record statistics for this interface address. */
1013                         if (ia) {
1014                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1015                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
1016                                     m->m_pkthdr.len);
1017                         }
1018                         error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
1019                 } else
1020                         m_freem(m);
1021         }
1022
1023         if (error == 0)
1024                 IP6STAT_INC(ip6s_fragmented);
1025
1026 done:
1027         if (ro == &ip6route)
1028                 RO_RTFREE(ro);
1029         if (ro_pmtu == &ip6route)
1030                 RO_RTFREE(ro_pmtu);
1031         return (error);
1032
1033 freehdrs:
1034         m_freem(exthdrs.ip6e_hbh);      /* m_freem will check if mbuf is 0 */
1035         m_freem(exthdrs.ip6e_dest1);
1036         m_freem(exthdrs.ip6e_rthdr);
1037         m_freem(exthdrs.ip6e_dest2);
1038         /* FALLTHROUGH */
1039 bad:
1040         if (m)
1041                 m_freem(m);
1042         goto done;
1043 }
1044
1045 static int
1046 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1047 {
1048         struct mbuf *m;
1049
1050         if (hlen > MCLBYTES)
1051                 return (ENOBUFS); /* XXX */
1052
1053         if (hlen > MLEN)
1054                 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1055         else
1056                 m = m_get(M_NOWAIT, MT_DATA);
1057         if (m == NULL)
1058                 return (ENOBUFS);
1059         m->m_len = hlen;
1060         if (hdr)
1061                 bcopy(hdr, mtod(m, caddr_t), hlen);
1062
1063         *mp = m;
1064         return (0);
1065 }
1066
1067 /*
1068  * Insert jumbo payload option.
1069  */
1070 static int
1071 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1072 {
1073         struct mbuf *mopt;
1074         u_char *optbuf;
1075         u_int32_t v;
1076
1077 #define JUMBOOPTLEN     8       /* length of jumbo payload option and padding */
1078
1079         /*
1080          * If there is no hop-by-hop options header, allocate new one.
1081          * If there is one but it doesn't have enough space to store the
1082          * jumbo payload option, allocate a cluster to store the whole options.
1083          * Otherwise, use it to store the options.
1084          */
1085         if (exthdrs->ip6e_hbh == 0) {
1086                 mopt = m_get(M_NOWAIT, MT_DATA);
1087                 if (mopt == NULL)
1088                         return (ENOBUFS);
1089                 mopt->m_len = JUMBOOPTLEN;
1090                 optbuf = mtod(mopt, u_char *);
1091                 optbuf[1] = 0;  /* = ((JUMBOOPTLEN) >> 3) - 1 */
1092                 exthdrs->ip6e_hbh = mopt;
1093         } else {
1094                 struct ip6_hbh *hbh;
1095
1096                 mopt = exthdrs->ip6e_hbh;
1097                 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1098                         /*
1099                          * XXX assumption:
1100                          * - exthdrs->ip6e_hbh is not referenced from places
1101                          *   other than exthdrs.
1102                          * - exthdrs->ip6e_hbh is not an mbuf chain.
1103                          */
1104                         int oldoptlen = mopt->m_len;
1105                         struct mbuf *n;
1106
1107                         /*
1108                          * XXX: give up if the whole (new) hbh header does
1109                          * not fit even in an mbuf cluster.
1110                          */
1111                         if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1112                                 return (ENOBUFS);
1113
1114                         /*
1115                          * As a consequence, we must always prepare a cluster
1116                          * at this point.
1117                          */
1118                         n = m_getcl(M_NOWAIT, MT_DATA, 0);
1119                         if (n == NULL)
1120                                 return (ENOBUFS);
1121                         n->m_len = oldoptlen + JUMBOOPTLEN;
1122                         bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1123                             oldoptlen);
1124                         optbuf = mtod(n, caddr_t) + oldoptlen;
1125                         m_freem(mopt);
1126                         mopt = exthdrs->ip6e_hbh = n;
1127                 } else {
1128                         optbuf = mtod(mopt, u_char *) + mopt->m_len;
1129                         mopt->m_len += JUMBOOPTLEN;
1130                 }
1131                 optbuf[0] = IP6OPT_PADN;
1132                 optbuf[1] = 1;
1133
1134                 /*
1135                  * Adjust the header length according to the pad and
1136                  * the jumbo payload option.
1137                  */
1138                 hbh = mtod(mopt, struct ip6_hbh *);
1139                 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1140         }
1141
1142         /* fill in the option. */
1143         optbuf[2] = IP6OPT_JUMBO;
1144         optbuf[3] = 4;
1145         v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1146         bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1147
1148         /* finally, adjust the packet header length */
1149         exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1150
1151         return (0);
1152 #undef JUMBOOPTLEN
1153 }
1154
1155 /*
1156  * Insert fragment header and copy unfragmentable header portions.
1157  */
1158 static int
1159 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1160     struct ip6_frag **frghdrp)
1161 {
1162         struct mbuf *n, *mlast;
1163
1164         if (hlen > sizeof(struct ip6_hdr)) {
1165                 n = m_copym(m0, sizeof(struct ip6_hdr),
1166                     hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1167                 if (n == 0)
1168                         return (ENOBUFS);
1169                 m->m_next = n;
1170         } else
1171                 n = m;
1172
1173         /* Search for the last mbuf of unfragmentable part. */
1174         for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1175                 ;
1176
1177         if ((mlast->m_flags & M_EXT) == 0 &&
1178             M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1179                 /* use the trailing space of the last mbuf for the fragment hdr */
1180                 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1181                     mlast->m_len);
1182                 mlast->m_len += sizeof(struct ip6_frag);
1183                 m->m_pkthdr.len += sizeof(struct ip6_frag);
1184         } else {
1185                 /* allocate a new mbuf for the fragment header */
1186                 struct mbuf *mfrg;
1187
1188                 mfrg = m_get(M_NOWAIT, MT_DATA);
1189                 if (mfrg == NULL)
1190                         return (ENOBUFS);
1191                 mfrg->m_len = sizeof(struct ip6_frag);
1192                 *frghdrp = mtod(mfrg, struct ip6_frag *);
1193                 mlast->m_next = mfrg;
1194         }
1195
1196         return (0);
1197 }
1198
1199 static int
1200 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro,
1201     struct ifnet *ifp, struct in6_addr *dst, u_long *mtup,
1202     int *alwaysfragp, u_int fibnum)
1203 {
1204         u_int32_t mtu = 0;
1205         int alwaysfrag = 0;
1206         int error = 0;
1207
1208         if (ro_pmtu != ro) {
1209                 /* The first hop and the final destination may differ. */
1210                 struct sockaddr_in6 *sa6_dst =
1211                     (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1212                 if (ro_pmtu->ro_rt &&
1213                     ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
1214                      !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
1215                         RTFREE(ro_pmtu->ro_rt);
1216                         ro_pmtu->ro_rt = (struct rtentry *)NULL;
1217                 }
1218                 if (ro_pmtu->ro_rt == NULL) {
1219                         bzero(sa6_dst, sizeof(*sa6_dst));
1220                         sa6_dst->sin6_family = AF_INET6;
1221                         sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1222                         sa6_dst->sin6_addr = *dst;
1223
1224                         in6_rtalloc(ro_pmtu, fibnum);
1225                 }
1226         }
1227         if (ro_pmtu->ro_rt) {
1228                 u_int32_t ifmtu;
1229                 struct in_conninfo inc;
1230
1231                 bzero(&inc, sizeof(inc));
1232                 inc.inc_flags |= INC_ISIPV6;
1233                 inc.inc6_faddr = *dst;
1234
1235                 if (ifp == NULL)
1236                         ifp = ro_pmtu->ro_rt->rt_ifp;
1237                 ifmtu = IN6_LINKMTU(ifp);
1238                 mtu = tcp_hc_getmtu(&inc);
1239                 if (mtu)
1240                         mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu);
1241                 else
1242                         mtu = ro_pmtu->ro_rt->rt_mtu;
1243                 if (mtu == 0)
1244                         mtu = ifmtu;
1245                 else if (mtu < IPV6_MMTU) {
1246                         /*
1247                          * RFC2460 section 5, last paragraph:
1248                          * if we record ICMPv6 too big message with
1249                          * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1250                          * or smaller, with framgent header attached.
1251                          * (fragment header is needed regardless from the
1252                          * packet size, for translators to identify packets)
1253                          */
1254                         alwaysfrag = 1;
1255                         mtu = IPV6_MMTU;
1256                 } else if (mtu > ifmtu) {
1257                         /*
1258                          * The MTU on the route is larger than the MTU on
1259                          * the interface!  This shouldn't happen, unless the
1260                          * MTU of the interface has been changed after the
1261                          * interface was brought up.  Change the MTU in the
1262                          * route to match the interface MTU (as long as the
1263                          * field isn't locked).
1264                          */
1265                         mtu = ifmtu;
1266                         ro_pmtu->ro_rt->rt_mtu = mtu;
1267                 }
1268         } else if (ifp) {
1269                 mtu = IN6_LINKMTU(ifp);
1270         } else
1271                 error = EHOSTUNREACH; /* XXX */
1272
1273         *mtup = mtu;
1274         if (alwaysfragp)
1275                 *alwaysfragp = alwaysfrag;
1276         return (error);
1277 }
1278
1279 /*
1280  * IP6 socket option processing.
1281  */
1282 int
1283 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1284 {
1285         int optdatalen, uproto;
1286         void *optdata;
1287         struct inpcb *in6p = sotoinpcb(so);
1288         int error, optval;
1289         int level, op, optname;
1290         int optlen;
1291         struct thread *td;
1292 #ifdef  RSS
1293         uint32_t rss_bucket;
1294         int retval;
1295 #endif
1296
1297         level = sopt->sopt_level;
1298         op = sopt->sopt_dir;
1299         optname = sopt->sopt_name;
1300         optlen = sopt->sopt_valsize;
1301         td = sopt->sopt_td;
1302         error = 0;
1303         optval = 0;
1304         uproto = (int)so->so_proto->pr_protocol;
1305
1306         if (level != IPPROTO_IPV6) {
1307                 error = EINVAL;
1308
1309                 if (sopt->sopt_level == SOL_SOCKET &&
1310                     sopt->sopt_dir == SOPT_SET) {
1311                         switch (sopt->sopt_name) {
1312                         case SO_REUSEADDR:
1313                                 INP_WLOCK(in6p);
1314                                 if ((so->so_options & SO_REUSEADDR) != 0)
1315                                         in6p->inp_flags2 |= INP_REUSEADDR;
1316                                 else
1317                                         in6p->inp_flags2 &= ~INP_REUSEADDR;
1318                                 INP_WUNLOCK(in6p);
1319                                 error = 0;
1320                                 break;
1321                         case SO_REUSEPORT:
1322                                 INP_WLOCK(in6p);
1323                                 if ((so->so_options & SO_REUSEPORT) != 0)
1324                                         in6p->inp_flags2 |= INP_REUSEPORT;
1325                                 else
1326                                         in6p->inp_flags2 &= ~INP_REUSEPORT;
1327                                 INP_WUNLOCK(in6p);
1328                                 error = 0;
1329                                 break;
1330                         case SO_SETFIB:
1331                                 INP_WLOCK(in6p);
1332                                 in6p->inp_inc.inc_fibnum = so->so_fibnum;
1333                                 INP_WUNLOCK(in6p);
1334                                 error = 0;
1335                                 break;
1336                         default:
1337                                 break;
1338                         }
1339                 }
1340         } else {                /* level == IPPROTO_IPV6 */
1341                 switch (op) {
1342
1343                 case SOPT_SET:
1344                         switch (optname) {
1345                         case IPV6_2292PKTOPTIONS:
1346 #ifdef IPV6_PKTOPTIONS
1347                         case IPV6_PKTOPTIONS:
1348 #endif
1349                         {
1350                                 struct mbuf *m;
1351
1352                                 error = soopt_getm(sopt, &m); /* XXX */
1353                                 if (error != 0)
1354                                         break;
1355                                 error = soopt_mcopyin(sopt, m); /* XXX */
1356                                 if (error != 0)
1357                                         break;
1358                                 error = ip6_pcbopts(&in6p->in6p_outputopts,
1359                                                     m, so, sopt);
1360                                 m_freem(m); /* XXX */
1361                                 break;
1362                         }
1363
1364                         /*
1365                          * Use of some Hop-by-Hop options or some
1366                          * Destination options, might require special
1367                          * privilege.  That is, normal applications
1368                          * (without special privilege) might be forbidden
1369                          * from setting certain options in outgoing packets,
1370                          * and might never see certain options in received
1371                          * packets. [RFC 2292 Section 6]
1372                          * KAME specific note:
1373                          *  KAME prevents non-privileged users from sending or
1374                          *  receiving ANY hbh/dst options in order to avoid
1375                          *  overhead of parsing options in the kernel.
1376                          */
1377                         case IPV6_RECVHOPOPTS:
1378                         case IPV6_RECVDSTOPTS:
1379                         case IPV6_RECVRTHDRDSTOPTS:
1380                                 if (td != NULL) {
1381                                         error = priv_check(td,
1382                                             PRIV_NETINET_SETHDROPTS);
1383                                         if (error)
1384                                                 break;
1385                                 }
1386                                 /* FALLTHROUGH */
1387                         case IPV6_UNICAST_HOPS:
1388                         case IPV6_HOPLIMIT:
1389                         case IPV6_FAITH:
1390
1391                         case IPV6_RECVPKTINFO:
1392                         case IPV6_RECVHOPLIMIT:
1393                         case IPV6_RECVRTHDR:
1394                         case IPV6_RECVPATHMTU:
1395                         case IPV6_RECVTCLASS:
1396                         case IPV6_V6ONLY:
1397                         case IPV6_AUTOFLOWLABEL:
1398                         case IPV6_BINDANY:
1399                         case IPV6_BINDMULTI:
1400 #ifdef  RSS
1401                         case IPV6_RSS_LISTEN_BUCKET:
1402 #endif
1403                                 if (optname == IPV6_BINDANY && td != NULL) {
1404                                         error = priv_check(td,
1405                                             PRIV_NETINET_BINDANY);
1406                                         if (error)
1407                                                 break;
1408                                 }
1409
1410                                 if (optlen != sizeof(int)) {
1411                                         error = EINVAL;
1412                                         break;
1413                                 }
1414                                 error = sooptcopyin(sopt, &optval,
1415                                         sizeof optval, sizeof optval);
1416                                 if (error)
1417                                         break;
1418                                 switch (optname) {
1419
1420                                 case IPV6_UNICAST_HOPS:
1421                                         if (optval < -1 || optval >= 256)
1422                                                 error = EINVAL;
1423                                         else {
1424                                                 /* -1 = kernel default */
1425                                                 in6p->in6p_hops = optval;
1426                                                 if ((in6p->inp_vflag &
1427                                                      INP_IPV4) != 0)
1428                                                         in6p->inp_ip_ttl = optval;
1429                                         }
1430                                         break;
1431 #define OPTSET(bit) \
1432 do { \
1433         INP_WLOCK(in6p); \
1434         if (optval) \
1435                 in6p->inp_flags |= (bit); \
1436         else \
1437                 in6p->inp_flags &= ~(bit); \
1438         INP_WUNLOCK(in6p); \
1439 } while (/*CONSTCOND*/ 0)
1440 #define OPTSET2292(bit) \
1441 do { \
1442         INP_WLOCK(in6p); \
1443         in6p->inp_flags |= IN6P_RFC2292; \
1444         if (optval) \
1445                 in6p->inp_flags |= (bit); \
1446         else \
1447                 in6p->inp_flags &= ~(bit); \
1448         INP_WUNLOCK(in6p); \
1449 } while (/*CONSTCOND*/ 0)
1450 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
1451
1452 #define OPTSET2(bit, val) do {                                          \
1453         INP_WLOCK(in6p);                                                \
1454         if (val)                                                        \
1455                 in6p->inp_flags2 |= bit;                                \
1456         else                                                            \
1457                 in6p->inp_flags2 &= ~bit;                               \
1458         INP_WUNLOCK(in6p);                                              \
1459 } while (0)
1460 #define OPTBIT2(bit) (in6p->inp_flags2 & (bit) ? 1 : 0)
1461
1462                                 case IPV6_RECVPKTINFO:
1463                                         /* cannot mix with RFC2292 */
1464                                         if (OPTBIT(IN6P_RFC2292)) {
1465                                                 error = EINVAL;
1466                                                 break;
1467                                         }
1468                                         OPTSET(IN6P_PKTINFO);
1469                                         break;
1470
1471                                 case IPV6_HOPLIMIT:
1472                                 {
1473                                         struct ip6_pktopts **optp;
1474
1475                                         /* cannot mix with RFC2292 */
1476                                         if (OPTBIT(IN6P_RFC2292)) {
1477                                                 error = EINVAL;
1478                                                 break;
1479                                         }
1480                                         optp = &in6p->in6p_outputopts;
1481                                         error = ip6_pcbopt(IPV6_HOPLIMIT,
1482                                             (u_char *)&optval, sizeof(optval),
1483                                             optp, (td != NULL) ? td->td_ucred :
1484                                             NULL, uproto);
1485                                         break;
1486                                 }
1487
1488                                 case IPV6_RECVHOPLIMIT:
1489                                         /* cannot mix with RFC2292 */
1490                                         if (OPTBIT(IN6P_RFC2292)) {
1491                                                 error = EINVAL;
1492                                                 break;
1493                                         }
1494                                         OPTSET(IN6P_HOPLIMIT);
1495                                         break;
1496
1497                                 case IPV6_RECVHOPOPTS:
1498                                         /* cannot mix with RFC2292 */
1499                                         if (OPTBIT(IN6P_RFC2292)) {
1500                                                 error = EINVAL;
1501                                                 break;
1502                                         }
1503                                         OPTSET(IN6P_HOPOPTS);
1504                                         break;
1505
1506                                 case IPV6_RECVDSTOPTS:
1507                                         /* cannot mix with RFC2292 */
1508                                         if (OPTBIT(IN6P_RFC2292)) {
1509                                                 error = EINVAL;
1510                                                 break;
1511                                         }
1512                                         OPTSET(IN6P_DSTOPTS);
1513                                         break;
1514
1515                                 case IPV6_RECVRTHDRDSTOPTS:
1516                                         /* cannot mix with RFC2292 */
1517                                         if (OPTBIT(IN6P_RFC2292)) {
1518                                                 error = EINVAL;
1519                                                 break;
1520                                         }
1521                                         OPTSET(IN6P_RTHDRDSTOPTS);
1522                                         break;
1523
1524                                 case IPV6_RECVRTHDR:
1525                                         /* cannot mix with RFC2292 */
1526                                         if (OPTBIT(IN6P_RFC2292)) {
1527                                                 error = EINVAL;
1528                                                 break;
1529                                         }
1530                                         OPTSET(IN6P_RTHDR);
1531                                         break;
1532
1533                                 case IPV6_FAITH:
1534                                         OPTSET(INP_FAITH);
1535                                         break;
1536
1537                                 case IPV6_RECVPATHMTU:
1538                                         /*
1539                                          * We ignore this option for TCP
1540                                          * sockets.
1541                                          * (RFC3542 leaves this case
1542                                          * unspecified.)
1543                                          */
1544                                         if (uproto != IPPROTO_TCP)
1545                                                 OPTSET(IN6P_MTU);
1546                                         break;
1547
1548                                 case IPV6_V6ONLY:
1549                                         /*
1550                                          * make setsockopt(IPV6_V6ONLY)
1551                                          * available only prior to bind(2).
1552                                          * see ipng mailing list, Jun 22 2001.
1553                                          */
1554                                         if (in6p->inp_lport ||
1555                                             !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1556                                                 error = EINVAL;
1557                                                 break;
1558                                         }
1559                                         OPTSET(IN6P_IPV6_V6ONLY);
1560                                         if (optval)
1561                                                 in6p->inp_vflag &= ~INP_IPV4;
1562                                         else
1563                                                 in6p->inp_vflag |= INP_IPV4;
1564                                         break;
1565                                 case IPV6_RECVTCLASS:
1566                                         /* cannot mix with RFC2292 XXX */
1567                                         if (OPTBIT(IN6P_RFC2292)) {
1568                                                 error = EINVAL;
1569                                                 break;
1570                                         }
1571                                         OPTSET(IN6P_TCLASS);
1572                                         break;
1573                                 case IPV6_AUTOFLOWLABEL:
1574                                         OPTSET(IN6P_AUTOFLOWLABEL);
1575                                         break;
1576
1577                                 case IPV6_BINDANY:
1578                                         OPTSET(INP_BINDANY);
1579                                         break;
1580
1581                                 case IPV6_BINDMULTI:
1582                                         OPTSET2(INP_BINDMULTI, optval);
1583                                         break;
1584 #ifdef  RSS
1585                                 case IPV6_RSS_LISTEN_BUCKET:
1586                                         if ((optval >= 0) &&
1587                                             (optval < rss_getnumbuckets())) {
1588                                                 in6p->inp_rss_listen_bucket = optval;
1589                                                 OPTSET2(INP_RSS_BUCKET_SET, 1);
1590                                         } else {
1591                                                 error = EINVAL;
1592                                         }
1593                                         break;
1594 #endif
1595                                 }
1596                                 break;
1597
1598                         case IPV6_TCLASS:
1599                         case IPV6_DONTFRAG:
1600                         case IPV6_USE_MIN_MTU:
1601                         case IPV6_PREFER_TEMPADDR:
1602                                 if (optlen != sizeof(optval)) {
1603                                         error = EINVAL;
1604                                         break;
1605                                 }
1606                                 error = sooptcopyin(sopt, &optval,
1607                                         sizeof optval, sizeof optval);
1608                                 if (error)
1609                                         break;
1610                                 {
1611                                         struct ip6_pktopts **optp;
1612                                         optp = &in6p->in6p_outputopts;
1613                                         error = ip6_pcbopt(optname,
1614                                             (u_char *)&optval, sizeof(optval),
1615                                             optp, (td != NULL) ? td->td_ucred :
1616                                             NULL, uproto);
1617                                         break;
1618                                 }
1619
1620                         case IPV6_2292PKTINFO:
1621                         case IPV6_2292HOPLIMIT:
1622                         case IPV6_2292HOPOPTS:
1623                         case IPV6_2292DSTOPTS:
1624                         case IPV6_2292RTHDR:
1625                                 /* RFC 2292 */
1626                                 if (optlen != sizeof(int)) {
1627                                         error = EINVAL;
1628                                         break;
1629                                 }
1630                                 error = sooptcopyin(sopt, &optval,
1631                                         sizeof optval, sizeof optval);
1632                                 if (error)
1633                                         break;
1634                                 switch (optname) {
1635                                 case IPV6_2292PKTINFO:
1636                                         OPTSET2292(IN6P_PKTINFO);
1637                                         break;
1638                                 case IPV6_2292HOPLIMIT:
1639                                         OPTSET2292(IN6P_HOPLIMIT);
1640                                         break;
1641                                 case IPV6_2292HOPOPTS:
1642                                         /*
1643                                          * Check super-user privilege.
1644                                          * See comments for IPV6_RECVHOPOPTS.
1645                                          */
1646                                         if (td != NULL) {
1647                                                 error = priv_check(td,
1648                                                     PRIV_NETINET_SETHDROPTS);
1649                                                 if (error)
1650                                                         return (error);
1651                                         }
1652                                         OPTSET2292(IN6P_HOPOPTS);
1653                                         break;
1654                                 case IPV6_2292DSTOPTS:
1655                                         if (td != NULL) {
1656                                                 error = priv_check(td,
1657                                                     PRIV_NETINET_SETHDROPTS);
1658                                                 if (error)
1659                                                         return (error);
1660                                         }
1661                                         OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1662                                         break;
1663                                 case IPV6_2292RTHDR:
1664                                         OPTSET2292(IN6P_RTHDR);
1665                                         break;
1666                                 }
1667                                 break;
1668                         case IPV6_PKTINFO:
1669                         case IPV6_HOPOPTS:
1670                         case IPV6_RTHDR:
1671                         case IPV6_DSTOPTS:
1672                         case IPV6_RTHDRDSTOPTS:
1673                         case IPV6_NEXTHOP:
1674                         {
1675                                 /* new advanced API (RFC3542) */
1676                                 u_char *optbuf;
1677                                 u_char optbuf_storage[MCLBYTES];
1678                                 int optlen;
1679                                 struct ip6_pktopts **optp;
1680
1681                                 /* cannot mix with RFC2292 */
1682                                 if (OPTBIT(IN6P_RFC2292)) {
1683                                         error = EINVAL;
1684                                         break;
1685                                 }
1686
1687                                 /*
1688                                  * We only ensure valsize is not too large
1689                                  * here.  Further validation will be done
1690                                  * later.
1691                                  */
1692                                 error = sooptcopyin(sopt, optbuf_storage,
1693                                     sizeof(optbuf_storage), 0);
1694                                 if (error)
1695                                         break;
1696                                 optlen = sopt->sopt_valsize;
1697                                 optbuf = optbuf_storage;
1698                                 optp = &in6p->in6p_outputopts;
1699                                 error = ip6_pcbopt(optname, optbuf, optlen,
1700                                     optp, (td != NULL) ? td->td_ucred : NULL,
1701                                     uproto);
1702                                 break;
1703                         }
1704 #undef OPTSET
1705
1706                         case IPV6_MULTICAST_IF:
1707                         case IPV6_MULTICAST_HOPS:
1708                         case IPV6_MULTICAST_LOOP:
1709                         case IPV6_JOIN_GROUP:
1710                         case IPV6_LEAVE_GROUP:
1711                         case IPV6_MSFILTER:
1712                         case MCAST_BLOCK_SOURCE:
1713                         case MCAST_UNBLOCK_SOURCE:
1714                         case MCAST_JOIN_GROUP:
1715                         case MCAST_LEAVE_GROUP:
1716                         case MCAST_JOIN_SOURCE_GROUP:
1717                         case MCAST_LEAVE_SOURCE_GROUP:
1718                                 error = ip6_setmoptions(in6p, sopt);
1719                                 break;
1720
1721                         case IPV6_PORTRANGE:
1722                                 error = sooptcopyin(sopt, &optval,
1723                                     sizeof optval, sizeof optval);
1724                                 if (error)
1725                                         break;
1726
1727                                 INP_WLOCK(in6p);
1728                                 switch (optval) {
1729                                 case IPV6_PORTRANGE_DEFAULT:
1730                                         in6p->inp_flags &= ~(INP_LOWPORT);
1731                                         in6p->inp_flags &= ~(INP_HIGHPORT);
1732                                         break;
1733
1734                                 case IPV6_PORTRANGE_HIGH:
1735                                         in6p->inp_flags &= ~(INP_LOWPORT);
1736                                         in6p->inp_flags |= INP_HIGHPORT;
1737                                         break;
1738
1739                                 case IPV6_PORTRANGE_LOW:
1740                                         in6p->inp_flags &= ~(INP_HIGHPORT);
1741                                         in6p->inp_flags |= INP_LOWPORT;
1742                                         break;
1743
1744                                 default:
1745                                         error = EINVAL;
1746                                         break;
1747                                 }
1748                                 INP_WUNLOCK(in6p);
1749                                 break;
1750
1751 #ifdef IPSEC
1752                         case IPV6_IPSEC_POLICY:
1753                         {
1754                                 caddr_t req;
1755                                 struct mbuf *m;
1756
1757                                 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1758                                         break;
1759                                 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1760                                         break;
1761                                 req = mtod(m, caddr_t);
1762                                 error = ipsec_set_policy(in6p, optname, req,
1763                                     m->m_len, (sopt->sopt_td != NULL) ?
1764                                     sopt->sopt_td->td_ucred : NULL);
1765                                 m_freem(m);
1766                                 break;
1767                         }
1768 #endif /* IPSEC */
1769
1770                         default:
1771                                 error = ENOPROTOOPT;
1772                                 break;
1773                         }
1774                         break;
1775
1776                 case SOPT_GET:
1777                         switch (optname) {
1778
1779                         case IPV6_2292PKTOPTIONS:
1780 #ifdef IPV6_PKTOPTIONS
1781                         case IPV6_PKTOPTIONS:
1782 #endif
1783                                 /*
1784                                  * RFC3542 (effectively) deprecated the
1785                                  * semantics of the 2292-style pktoptions.
1786                                  * Since it was not reliable in nature (i.e.,
1787                                  * applications had to expect the lack of some
1788                                  * information after all), it would make sense
1789                                  * to simplify this part by always returning
1790                                  * empty data.
1791                                  */
1792                                 sopt->sopt_valsize = 0;
1793                                 break;
1794
1795                         case IPV6_RECVHOPOPTS:
1796                         case IPV6_RECVDSTOPTS:
1797                         case IPV6_RECVRTHDRDSTOPTS:
1798                         case IPV6_UNICAST_HOPS:
1799                         case IPV6_RECVPKTINFO:
1800                         case IPV6_RECVHOPLIMIT:
1801                         case IPV6_RECVRTHDR:
1802                         case IPV6_RECVPATHMTU:
1803
1804                         case IPV6_FAITH:
1805                         case IPV6_V6ONLY:
1806                         case IPV6_PORTRANGE:
1807                         case IPV6_RECVTCLASS:
1808                         case IPV6_AUTOFLOWLABEL:
1809                         case IPV6_BINDANY:
1810                         case IPV6_FLOWID:
1811                         case IPV6_FLOWTYPE:
1812 #ifdef  RSS
1813                         case IPV6_RSSBUCKETID:
1814 #endif
1815                                 switch (optname) {
1816
1817                                 case IPV6_RECVHOPOPTS:
1818                                         optval = OPTBIT(IN6P_HOPOPTS);
1819                                         break;
1820
1821                                 case IPV6_RECVDSTOPTS:
1822                                         optval = OPTBIT(IN6P_DSTOPTS);
1823                                         break;
1824
1825                                 case IPV6_RECVRTHDRDSTOPTS:
1826                                         optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1827                                         break;
1828
1829                                 case IPV6_UNICAST_HOPS:
1830                                         optval = in6p->in6p_hops;
1831                                         break;
1832
1833                                 case IPV6_RECVPKTINFO:
1834                                         optval = OPTBIT(IN6P_PKTINFO);
1835                                         break;
1836
1837                                 case IPV6_RECVHOPLIMIT:
1838                                         optval = OPTBIT(IN6P_HOPLIMIT);
1839                                         break;
1840
1841                                 case IPV6_RECVRTHDR:
1842                                         optval = OPTBIT(IN6P_RTHDR);
1843                                         break;
1844
1845                                 case IPV6_RECVPATHMTU:
1846                                         optval = OPTBIT(IN6P_MTU);
1847                                         break;
1848
1849                                 case IPV6_FAITH:
1850                                         optval = OPTBIT(INP_FAITH);
1851                                         break;
1852
1853                                 case IPV6_V6ONLY:
1854                                         optval = OPTBIT(IN6P_IPV6_V6ONLY);
1855                                         break;
1856
1857                                 case IPV6_PORTRANGE:
1858                                     {
1859                                         int flags;
1860                                         flags = in6p->inp_flags;
1861                                         if (flags & INP_HIGHPORT)
1862                                                 optval = IPV6_PORTRANGE_HIGH;
1863                                         else if (flags & INP_LOWPORT)
1864                                                 optval = IPV6_PORTRANGE_LOW;
1865                                         else
1866                                                 optval = 0;
1867                                         break;
1868                                     }
1869                                 case IPV6_RECVTCLASS:
1870                                         optval = OPTBIT(IN6P_TCLASS);
1871                                         break;
1872
1873                                 case IPV6_AUTOFLOWLABEL:
1874                                         optval = OPTBIT(IN6P_AUTOFLOWLABEL);
1875                                         break;
1876
1877                                 case IPV6_BINDANY:
1878                                         optval = OPTBIT(INP_BINDANY);
1879                                         break;
1880
1881                                 case IPV6_FLOWID:
1882                                         optval = in6p->inp_flowid;
1883                                         break;
1884
1885                                 case IPV6_FLOWTYPE:
1886                                         optval = in6p->inp_flowtype;
1887                                         break;
1888 #ifdef  RSS
1889                                 case IPV6_RSSBUCKETID:
1890                                         retval =
1891                                             rss_hash2bucket(in6p->inp_flowid,
1892                                             in6p->inp_flowtype,
1893                                             &rss_bucket);
1894                                         if (retval == 0)
1895                                                 optval = rss_bucket;
1896                                         else
1897                                                 error = EINVAL;
1898                                         break;
1899 #endif
1900
1901                                 case IPV6_BINDMULTI:
1902                                         optval = OPTBIT2(INP_BINDMULTI);
1903                                         break;
1904
1905                                 }
1906                                 if (error)
1907                                         break;
1908                                 error = sooptcopyout(sopt, &optval,
1909                                         sizeof optval);
1910                                 break;
1911
1912                         case IPV6_PATHMTU:
1913                         {
1914                                 u_long pmtu = 0;
1915                                 struct ip6_mtuinfo mtuinfo;
1916                                 struct route_in6 sro;
1917
1918                                 bzero(&sro, sizeof(sro));
1919
1920                                 if (!(so->so_state & SS_ISCONNECTED))
1921                                         return (ENOTCONN);
1922                                 /*
1923                                  * XXX: we dot not consider the case of source
1924                                  * routing, or optional information to specify
1925                                  * the outgoing interface.
1926                                  */
1927                                 error = ip6_getpmtu(&sro, NULL, NULL,
1928                                     &in6p->in6p_faddr, &pmtu, NULL,
1929                                     so->so_fibnum);
1930                                 if (sro.ro_rt)
1931                                         RTFREE(sro.ro_rt);
1932                                 if (error)
1933                                         break;
1934                                 if (pmtu > IPV6_MAXPACKET)
1935                                         pmtu = IPV6_MAXPACKET;
1936
1937                                 bzero(&mtuinfo, sizeof(mtuinfo));
1938                                 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
1939                                 optdata = (void *)&mtuinfo;
1940                                 optdatalen = sizeof(mtuinfo);
1941                                 error = sooptcopyout(sopt, optdata,
1942                                     optdatalen);
1943                                 break;
1944                         }
1945
1946                         case IPV6_2292PKTINFO:
1947                         case IPV6_2292HOPLIMIT:
1948                         case IPV6_2292HOPOPTS:
1949                         case IPV6_2292RTHDR:
1950                         case IPV6_2292DSTOPTS:
1951                                 switch (optname) {
1952                                 case IPV6_2292PKTINFO:
1953                                         optval = OPTBIT(IN6P_PKTINFO);
1954                                         break;
1955                                 case IPV6_2292HOPLIMIT:
1956                                         optval = OPTBIT(IN6P_HOPLIMIT);
1957                                         break;
1958                                 case IPV6_2292HOPOPTS:
1959                                         optval = OPTBIT(IN6P_HOPOPTS);
1960                                         break;
1961                                 case IPV6_2292RTHDR:
1962                                         optval = OPTBIT(IN6P_RTHDR);
1963                                         break;
1964                                 case IPV6_2292DSTOPTS:
1965                                         optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
1966                                         break;
1967                                 }
1968                                 error = sooptcopyout(sopt, &optval,
1969                                     sizeof optval);
1970                                 break;
1971                         case IPV6_PKTINFO:
1972                         case IPV6_HOPOPTS:
1973                         case IPV6_RTHDR:
1974                         case IPV6_DSTOPTS:
1975                         case IPV6_RTHDRDSTOPTS:
1976                         case IPV6_NEXTHOP:
1977                         case IPV6_TCLASS:
1978                         case IPV6_DONTFRAG:
1979                         case IPV6_USE_MIN_MTU:
1980                         case IPV6_PREFER_TEMPADDR:
1981                                 error = ip6_getpcbopt(in6p->in6p_outputopts,
1982                                     optname, sopt);
1983                                 break;
1984
1985                         case IPV6_MULTICAST_IF:
1986                         case IPV6_MULTICAST_HOPS:
1987                         case IPV6_MULTICAST_LOOP:
1988                         case IPV6_MSFILTER:
1989                                 error = ip6_getmoptions(in6p, sopt);
1990                                 break;
1991
1992 #ifdef IPSEC
1993                         case IPV6_IPSEC_POLICY:
1994                           {
1995                                 caddr_t req = NULL;
1996                                 size_t len = 0;
1997                                 struct mbuf *m = NULL;
1998                                 struct mbuf **mp = &m;
1999                                 size_t ovalsize = sopt->sopt_valsize;
2000                                 caddr_t oval = (caddr_t)sopt->sopt_val;
2001
2002                                 error = soopt_getm(sopt, &m); /* XXX */
2003                                 if (error != 0)
2004                                         break;
2005                                 error = soopt_mcopyin(sopt, m); /* XXX */
2006                                 if (error != 0)
2007                                         break;
2008                                 sopt->sopt_valsize = ovalsize;
2009                                 sopt->sopt_val = oval;
2010                                 if (m) {
2011                                         req = mtod(m, caddr_t);
2012                                         len = m->m_len;
2013                                 }
2014                                 error = ipsec_get_policy(in6p, req, len, mp);
2015                                 if (error == 0)
2016                                         error = soopt_mcopyout(sopt, m); /* XXX */
2017                                 if (error == 0 && m)
2018                                         m_freem(m);
2019                                 break;
2020                           }
2021 #endif /* IPSEC */
2022
2023                         default:
2024                                 error = ENOPROTOOPT;
2025                                 break;
2026                         }
2027                         break;
2028                 }
2029         }
2030         return (error);
2031 }
2032
2033 int
2034 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2035 {
2036         int error = 0, optval, optlen;
2037         const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2038         struct inpcb *in6p = sotoinpcb(so);
2039         int level, op, optname;
2040
2041         level = sopt->sopt_level;
2042         op = sopt->sopt_dir;
2043         optname = sopt->sopt_name;
2044         optlen = sopt->sopt_valsize;
2045
2046         if (level != IPPROTO_IPV6) {
2047                 return (EINVAL);
2048         }
2049
2050         switch (optname) {
2051         case IPV6_CHECKSUM:
2052                 /*
2053                  * For ICMPv6 sockets, no modification allowed for checksum
2054                  * offset, permit "no change" values to help existing apps.
2055                  *
2056                  * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2057                  * for an ICMPv6 socket will fail."
2058                  * The current behavior does not meet RFC3542.
2059                  */
2060                 switch (op) {
2061                 case SOPT_SET:
2062                         if (optlen != sizeof(int)) {
2063                                 error = EINVAL;
2064                                 break;
2065                         }
2066                         error = sooptcopyin(sopt, &optval, sizeof(optval),
2067                                             sizeof(optval));
2068                         if (error)
2069                                 break;
2070                         if ((optval % 2) != 0) {
2071                                 /* the API assumes even offset values */
2072                                 error = EINVAL;
2073                         } else if (so->so_proto->pr_protocol ==
2074                             IPPROTO_ICMPV6) {
2075                                 if (optval != icmp6off)
2076                                         error = EINVAL;
2077                         } else
2078                                 in6p->in6p_cksum = optval;
2079                         break;
2080
2081                 case SOPT_GET:
2082                         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2083                                 optval = icmp6off;
2084                         else
2085                                 optval = in6p->in6p_cksum;
2086
2087                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2088                         break;
2089
2090                 default:
2091                         error = EINVAL;
2092                         break;
2093                 }
2094                 break;
2095
2096         default:
2097                 error = ENOPROTOOPT;
2098                 break;
2099         }
2100
2101         return (error);
2102 }
2103
2104 /*
2105  * Set up IP6 options in pcb for insertion in output packets or
2106  * specifying behavior of outgoing packets.
2107  */
2108 static int
2109 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2110     struct socket *so, struct sockopt *sopt)
2111 {
2112         struct ip6_pktopts *opt = *pktopt;
2113         int error = 0;
2114         struct thread *td = sopt->sopt_td;
2115
2116         /* turn off any old options. */
2117         if (opt) {
2118 #ifdef DIAGNOSTIC
2119                 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2120                     opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2121                     opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2122                         printf("ip6_pcbopts: all specified options are cleared.\n");
2123 #endif
2124                 ip6_clearpktopts(opt, -1);
2125         } else
2126                 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2127         *pktopt = NULL;
2128
2129         if (!m || m->m_len == 0) {
2130                 /*
2131                  * Only turning off any previous options, regardless of
2132                  * whether the opt is just created or given.
2133                  */
2134                 free(opt, M_IP6OPT);
2135                 return (0);
2136         }
2137
2138         /*  set options specified by user. */
2139         if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2140             td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2141                 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2142                 free(opt, M_IP6OPT);
2143                 return (error);
2144         }
2145         *pktopt = opt;
2146         return (0);
2147 }
2148
2149 /*
2150  * initialize ip6_pktopts.  beware that there are non-zero default values in
2151  * the struct.
2152  */
2153 void
2154 ip6_initpktopts(struct ip6_pktopts *opt)
2155 {
2156
2157         bzero(opt, sizeof(*opt));
2158         opt->ip6po_hlim = -1;   /* -1 means default hop limit */
2159         opt->ip6po_tclass = -1; /* -1 means default traffic class */
2160         opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2161         opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2162 }
2163
2164 static int
2165 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2166     struct ucred *cred, int uproto)
2167 {
2168         struct ip6_pktopts *opt;
2169
2170         if (*pktopt == NULL) {
2171                 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2172                     M_WAITOK);
2173                 ip6_initpktopts(*pktopt);
2174         }
2175         opt = *pktopt;
2176
2177         return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2178 }
2179
2180 static int
2181 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
2182 {
2183         void *optdata = NULL;
2184         int optdatalen = 0;
2185         struct ip6_ext *ip6e;
2186         int error = 0;
2187         struct in6_pktinfo null_pktinfo;
2188         int deftclass = 0, on;
2189         int defminmtu = IP6PO_MINMTU_MCASTONLY;
2190         int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2191
2192         switch (optname) {
2193         case IPV6_PKTINFO:
2194                 if (pktopt && pktopt->ip6po_pktinfo)
2195                         optdata = (void *)pktopt->ip6po_pktinfo;
2196                 else {
2197                         /* XXX: we don't have to do this every time... */
2198                         bzero(&null_pktinfo, sizeof(null_pktinfo));
2199                         optdata = (void *)&null_pktinfo;
2200                 }
2201                 optdatalen = sizeof(struct in6_pktinfo);
2202                 break;
2203         case IPV6_TCLASS:
2204                 if (pktopt && pktopt->ip6po_tclass >= 0)
2205                         optdata = (void *)&pktopt->ip6po_tclass;
2206                 else
2207                         optdata = (void *)&deftclass;
2208                 optdatalen = sizeof(int);
2209                 break;
2210         case IPV6_HOPOPTS:
2211                 if (pktopt && pktopt->ip6po_hbh) {
2212                         optdata = (void *)pktopt->ip6po_hbh;
2213                         ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
2214                         optdatalen = (ip6e->ip6e_len + 1) << 3;
2215                 }
2216                 break;
2217         case IPV6_RTHDR:
2218                 if (pktopt && pktopt->ip6po_rthdr) {
2219                         optdata = (void *)pktopt->ip6po_rthdr;
2220                         ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
2221                         optdatalen = (ip6e->ip6e_len + 1) << 3;
2222                 }
2223                 break;
2224         case IPV6_RTHDRDSTOPTS:
2225                 if (pktopt && pktopt->ip6po_dest1) {
2226                         optdata = (void *)pktopt->ip6po_dest1;
2227                         ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
2228                         optdatalen = (ip6e->ip6e_len + 1) << 3;
2229                 }
2230                 break;
2231         case IPV6_DSTOPTS:
2232                 if (pktopt && pktopt->ip6po_dest2) {
2233                         optdata = (void *)pktopt->ip6po_dest2;
2234                         ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
2235                         optdatalen = (ip6e->ip6e_len + 1) << 3;
2236                 }
2237                 break;
2238         case IPV6_NEXTHOP:
2239                 if (pktopt && pktopt->ip6po_nexthop) {
2240                         optdata = (void *)pktopt->ip6po_nexthop;
2241                         optdatalen = pktopt->ip6po_nexthop->sa_len;
2242                 }
2243                 break;
2244         case IPV6_USE_MIN_MTU:
2245                 if (pktopt)
2246                         optdata = (void *)&pktopt->ip6po_minmtu;
2247                 else
2248                         optdata = (void *)&defminmtu;
2249                 optdatalen = sizeof(int);
2250                 break;
2251         case IPV6_DONTFRAG:
2252                 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2253                         on = 1;
2254                 else
2255                         on = 0;
2256                 optdata = (void *)&on;
2257                 optdatalen = sizeof(on);
2258                 break;
2259         case IPV6_PREFER_TEMPADDR:
2260                 if (pktopt)
2261                         optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
2262                 else
2263                         optdata = (void *)&defpreftemp;
2264                 optdatalen = sizeof(int);
2265                 break;
2266         default:                /* should not happen */
2267 #ifdef DIAGNOSTIC
2268                 panic("ip6_getpcbopt: unexpected option\n");
2269 #endif
2270                 return (ENOPROTOOPT);
2271         }
2272
2273         error = sooptcopyout(sopt, optdata, optdatalen);
2274
2275         return (error);
2276 }
2277
2278 void
2279 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2280 {
2281         if (pktopt == NULL)
2282                 return;
2283
2284         if (optname == -1 || optname == IPV6_PKTINFO) {
2285                 if (pktopt->ip6po_pktinfo)
2286                         free(pktopt->ip6po_pktinfo, M_IP6OPT);
2287                 pktopt->ip6po_pktinfo = NULL;
2288         }
2289         if (optname == -1 || optname == IPV6_HOPLIMIT)
2290                 pktopt->ip6po_hlim = -1;
2291         if (optname == -1 || optname == IPV6_TCLASS)
2292                 pktopt->ip6po_tclass = -1;
2293         if (optname == -1 || optname == IPV6_NEXTHOP) {
2294                 if (pktopt->ip6po_nextroute.ro_rt) {
2295                         RTFREE(pktopt->ip6po_nextroute.ro_rt);
2296                         pktopt->ip6po_nextroute.ro_rt = NULL;
2297                 }
2298                 if (pktopt->ip6po_nexthop)
2299                         free(pktopt->ip6po_nexthop, M_IP6OPT);
2300                 pktopt->ip6po_nexthop = NULL;
2301         }
2302         if (optname == -1 || optname == IPV6_HOPOPTS) {
2303                 if (pktopt->ip6po_hbh)
2304                         free(pktopt->ip6po_hbh, M_IP6OPT);
2305                 pktopt->ip6po_hbh = NULL;
2306         }
2307         if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2308                 if (pktopt->ip6po_dest1)
2309                         free(pktopt->ip6po_dest1, M_IP6OPT);
2310                 pktopt->ip6po_dest1 = NULL;
2311         }
2312         if (optname == -1 || optname == IPV6_RTHDR) {
2313                 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2314                         free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2315                 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2316                 if (pktopt->ip6po_route.ro_rt) {
2317                         RTFREE(pktopt->ip6po_route.ro_rt);
2318                         pktopt->ip6po_route.ro_rt = NULL;
2319                 }
2320         }
2321         if (optname == -1 || optname == IPV6_DSTOPTS) {
2322                 if (pktopt->ip6po_dest2)
2323                         free(pktopt->ip6po_dest2, M_IP6OPT);
2324                 pktopt->ip6po_dest2 = NULL;
2325         }
2326 }
2327
2328 #define PKTOPT_EXTHDRCPY(type) \
2329 do {\
2330         if (src->type) {\
2331                 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2332                 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2333                 if (dst->type == NULL && canwait == M_NOWAIT)\
2334                         goto bad;\
2335                 bcopy(src->type, dst->type, hlen);\
2336         }\
2337 } while (/*CONSTCOND*/ 0)
2338
2339 static int
2340 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2341 {
2342         if (dst == NULL || src == NULL)  {
2343                 printf("ip6_clearpktopts: invalid argument\n");
2344                 return (EINVAL);
2345         }
2346
2347         dst->ip6po_hlim = src->ip6po_hlim;
2348         dst->ip6po_tclass = src->ip6po_tclass;
2349         dst->ip6po_flags = src->ip6po_flags;
2350         dst->ip6po_minmtu = src->ip6po_minmtu;
2351         dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2352         if (src->ip6po_pktinfo) {
2353                 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2354                     M_IP6OPT, canwait);
2355                 if (dst->ip6po_pktinfo == NULL)
2356                         goto bad;
2357                 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2358         }
2359         if (src->ip6po_nexthop) {
2360                 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2361                     M_IP6OPT, canwait);
2362                 if (dst->ip6po_nexthop == NULL)
2363                         goto bad;
2364                 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2365                     src->ip6po_nexthop->sa_len);
2366         }
2367         PKTOPT_EXTHDRCPY(ip6po_hbh);
2368         PKTOPT_EXTHDRCPY(ip6po_dest1);
2369         PKTOPT_EXTHDRCPY(ip6po_dest2);
2370         PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2371         return (0);
2372
2373   bad:
2374         ip6_clearpktopts(dst, -1);
2375         return (ENOBUFS);
2376 }
2377 #undef PKTOPT_EXTHDRCPY
2378
2379 struct ip6_pktopts *
2380 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2381 {
2382         int error;
2383         struct ip6_pktopts *dst;
2384
2385         dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2386         if (dst == NULL)
2387                 return (NULL);
2388         ip6_initpktopts(dst);
2389
2390         if ((error = copypktopts(dst, src, canwait)) != 0) {
2391                 free(dst, M_IP6OPT);
2392                 return (NULL);
2393         }
2394
2395         return (dst);
2396 }
2397
2398 void
2399 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2400 {
2401         if (pktopt == NULL)
2402                 return;
2403
2404         ip6_clearpktopts(pktopt, -1);
2405
2406         free(pktopt, M_IP6OPT);
2407 }
2408
2409 /*
2410  * Set IPv6 outgoing packet options based on advanced API.
2411  */
2412 int
2413 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2414     struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2415 {
2416         struct cmsghdr *cm = 0;
2417
2418         if (control == NULL || opt == NULL)
2419                 return (EINVAL);
2420
2421         ip6_initpktopts(opt);
2422         if (stickyopt) {
2423                 int error;
2424
2425                 /*
2426                  * If stickyopt is provided, make a local copy of the options
2427                  * for this particular packet, then override them by ancillary
2428                  * objects.
2429                  * XXX: copypktopts() does not copy the cached route to a next
2430                  * hop (if any).  This is not very good in terms of efficiency,
2431                  * but we can allow this since this option should be rarely
2432                  * used.
2433                  */
2434                 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2435                         return (error);
2436         }
2437
2438         /*
2439          * XXX: Currently, we assume all the optional information is stored
2440          * in a single mbuf.
2441          */
2442         if (control->m_next)
2443                 return (EINVAL);
2444
2445         for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2446             control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2447                 int error;
2448
2449                 if (control->m_len < CMSG_LEN(0))
2450                         return (EINVAL);
2451
2452                 cm = mtod(control, struct cmsghdr *);
2453                 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2454                         return (EINVAL);
2455                 if (cm->cmsg_level != IPPROTO_IPV6)
2456                         continue;
2457
2458                 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2459                     cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2460                 if (error)
2461                         return (error);
2462         }
2463
2464         return (0);
2465 }
2466
2467 /*
2468  * Set a particular packet option, as a sticky option or an ancillary data
2469  * item.  "len" can be 0 only when it's a sticky option.
2470  * We have 4 cases of combination of "sticky" and "cmsg":
2471  * "sticky=0, cmsg=0": impossible
2472  * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2473  * "sticky=1, cmsg=0": RFC3542 socket option
2474  * "sticky=1, cmsg=1": RFC2292 socket option
2475  */
2476 static int
2477 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2478     struct ucred *cred, int sticky, int cmsg, int uproto)
2479 {
2480         int minmtupolicy, preftemp;
2481         int error;
2482
2483         if (!sticky && !cmsg) {
2484 #ifdef DIAGNOSTIC
2485                 printf("ip6_setpktopt: impossible case\n");
2486 #endif
2487                 return (EINVAL);
2488         }
2489
2490         /*
2491          * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2492          * not be specified in the context of RFC3542.  Conversely,
2493          * RFC3542 types should not be specified in the context of RFC2292.
2494          */
2495         if (!cmsg) {
2496                 switch (optname) {
2497                 case IPV6_2292PKTINFO:
2498                 case IPV6_2292HOPLIMIT:
2499                 case IPV6_2292NEXTHOP:
2500                 case IPV6_2292HOPOPTS:
2501                 case IPV6_2292DSTOPTS:
2502                 case IPV6_2292RTHDR:
2503                 case IPV6_2292PKTOPTIONS:
2504                         return (ENOPROTOOPT);
2505                 }
2506         }
2507         if (sticky && cmsg) {
2508                 switch (optname) {
2509                 case IPV6_PKTINFO:
2510                 case IPV6_HOPLIMIT:
2511                 case IPV6_NEXTHOP:
2512                 case IPV6_HOPOPTS:
2513                 case IPV6_DSTOPTS:
2514                 case IPV6_RTHDRDSTOPTS:
2515                 case IPV6_RTHDR:
2516                 case IPV6_USE_MIN_MTU:
2517                 case IPV6_DONTFRAG:
2518                 case IPV6_TCLASS:
2519                 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2520                         return (ENOPROTOOPT);
2521                 }
2522         }
2523
2524         switch (optname) {
2525         case IPV6_2292PKTINFO:
2526         case IPV6_PKTINFO:
2527         {
2528                 struct ifnet *ifp = NULL;
2529                 struct in6_pktinfo *pktinfo;
2530
2531                 if (len != sizeof(struct in6_pktinfo))
2532                         return (EINVAL);
2533
2534                 pktinfo = (struct in6_pktinfo *)buf;
2535
2536                 /*
2537                  * An application can clear any sticky IPV6_PKTINFO option by
2538                  * doing a "regular" setsockopt with ipi6_addr being
2539                  * in6addr_any and ipi6_ifindex being zero.
2540                  * [RFC 3542, Section 6]
2541                  */
2542                 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2543                     pktinfo->ipi6_ifindex == 0 &&
2544                     IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2545                         ip6_clearpktopts(opt, optname);
2546                         break;
2547                 }
2548
2549                 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2550                     sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2551                         return (EINVAL);
2552                 }
2553
2554                 /* validate the interface index if specified. */
2555                 if (pktinfo->ipi6_ifindex > V_if_index)
2556                          return (ENXIO);
2557                 if (pktinfo->ipi6_ifindex) {
2558                         ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2559                         if (ifp == NULL)
2560                                 return (ENXIO);
2561                 }
2562
2563                 /*
2564                  * We store the address anyway, and let in6_selectsrc()
2565                  * validate the specified address.  This is because ipi6_addr
2566                  * may not have enough information about its scope zone, and
2567                  * we may need additional information (such as outgoing
2568                  * interface or the scope zone of a destination address) to
2569                  * disambiguate the scope.
2570                  * XXX: the delay of the validation may confuse the
2571                  * application when it is used as a sticky option.
2572                  */
2573                 if (opt->ip6po_pktinfo == NULL) {
2574                         opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2575                             M_IP6OPT, M_NOWAIT);
2576                         if (opt->ip6po_pktinfo == NULL)
2577                                 return (ENOBUFS);
2578                 }
2579                 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2580                 break;
2581         }
2582
2583         case IPV6_2292HOPLIMIT:
2584         case IPV6_HOPLIMIT:
2585         {
2586                 int *hlimp;
2587
2588                 /*
2589                  * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2590                  * to simplify the ordering among hoplimit options.
2591                  */
2592                 if (optname == IPV6_HOPLIMIT && sticky)
2593                         return (ENOPROTOOPT);
2594
2595                 if (len != sizeof(int))
2596                         return (EINVAL);
2597                 hlimp = (int *)buf;
2598                 if (*hlimp < -1 || *hlimp > 255)
2599                         return (EINVAL);
2600
2601                 opt->ip6po_hlim = *hlimp;
2602                 break;
2603         }
2604
2605         case IPV6_TCLASS:
2606         {
2607                 int tclass;
2608
2609                 if (len != sizeof(int))
2610                         return (EINVAL);
2611                 tclass = *(int *)buf;
2612                 if (tclass < -1 || tclass > 255)
2613                         return (EINVAL);
2614
2615                 opt->ip6po_tclass = tclass;
2616                 break;
2617         }
2618
2619         case IPV6_2292NEXTHOP:
2620         case IPV6_NEXTHOP:
2621                 if (cred != NULL) {
2622                         error = priv_check_cred(cred,
2623                             PRIV_NETINET_SETHDROPTS, 0);
2624                         if (error)
2625                                 return (error);
2626                 }
2627
2628                 if (len == 0) { /* just remove the option */
2629                         ip6_clearpktopts(opt, IPV6_NEXTHOP);
2630                         break;
2631                 }
2632
2633                 /* check if cmsg_len is large enough for sa_len */
2634                 if (len < sizeof(struct sockaddr) || len < *buf)
2635                         return (EINVAL);
2636
2637                 switch (((struct sockaddr *)buf)->sa_family) {
2638                 case AF_INET6:
2639                 {
2640                         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2641                         int error;
2642
2643                         if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2644                                 return (EINVAL);
2645
2646                         if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2647                             IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2648                                 return (EINVAL);
2649                         }
2650                         if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2651                             != 0) {
2652                                 return (error);
2653                         }
2654                         break;
2655                 }
2656                 case AF_LINK:   /* should eventually be supported */
2657                 default:
2658                         return (EAFNOSUPPORT);
2659                 }
2660
2661                 /* turn off the previous option, then set the new option. */
2662                 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2663                 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2664                 if (opt->ip6po_nexthop == NULL)
2665                         return (ENOBUFS);
2666                 bcopy(buf, opt->ip6po_nexthop, *buf);
2667                 break;
2668
2669         case IPV6_2292HOPOPTS:
2670         case IPV6_HOPOPTS:
2671         {
2672                 struct ip6_hbh *hbh;
2673                 int hbhlen;
2674
2675                 /*
2676                  * XXX: We don't allow a non-privileged user to set ANY HbH
2677                  * options, since per-option restriction has too much
2678                  * overhead.
2679                  */
2680                 if (cred != NULL) {
2681                         error = priv_check_cred(cred,
2682                             PRIV_NETINET_SETHDROPTS, 0);
2683                         if (error)
2684                                 return (error);
2685                 }
2686
2687                 if (len == 0) {
2688                         ip6_clearpktopts(opt, IPV6_HOPOPTS);
2689                         break;  /* just remove the option */
2690                 }
2691
2692                 /* message length validation */
2693                 if (len < sizeof(struct ip6_hbh))
2694                         return (EINVAL);
2695                 hbh = (struct ip6_hbh *)buf;
2696                 hbhlen = (hbh->ip6h_len + 1) << 3;
2697                 if (len != hbhlen)
2698                         return (EINVAL);
2699
2700                 /* turn off the previous option, then set the new option. */
2701                 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2702                 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2703                 if (opt->ip6po_hbh == NULL)
2704                         return (ENOBUFS);
2705                 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2706
2707                 break;
2708         }
2709
2710         case IPV6_2292DSTOPTS:
2711         case IPV6_DSTOPTS:
2712         case IPV6_RTHDRDSTOPTS:
2713         {
2714                 struct ip6_dest *dest, **newdest = NULL;
2715                 int destlen;
2716
2717                 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2718                         error = priv_check_cred(cred,
2719                             PRIV_NETINET_SETHDROPTS, 0);
2720                         if (error)
2721                                 return (error);
2722                 }
2723
2724                 if (len == 0) {
2725                         ip6_clearpktopts(opt, optname);
2726                         break;  /* just remove the option */
2727                 }
2728
2729                 /* message length validation */
2730                 if (len < sizeof(struct ip6_dest))
2731                         return (EINVAL);
2732                 dest = (struct ip6_dest *)buf;
2733                 destlen = (dest->ip6d_len + 1) << 3;
2734                 if (len != destlen)
2735                         return (EINVAL);
2736
2737                 /*
2738                  * Determine the position that the destination options header
2739                  * should be inserted; before or after the routing header.
2740                  */
2741                 switch (optname) {
2742                 case IPV6_2292DSTOPTS:
2743                         /*
2744                          * The old advacned API is ambiguous on this point.
2745                          * Our approach is to determine the position based
2746                          * according to the existence of a routing header.
2747                          * Note, however, that this depends on the order of the
2748                          * extension headers in the ancillary data; the 1st
2749                          * part of the destination options header must appear
2750                          * before the routing header in the ancillary data,
2751                          * too.
2752                          * RFC3542 solved the ambiguity by introducing
2753                          * separate ancillary data or option types.
2754                          */
2755                         if (opt->ip6po_rthdr == NULL)
2756                                 newdest = &opt->ip6po_dest1;
2757                         else
2758                                 newdest = &opt->ip6po_dest2;
2759                         break;
2760                 case IPV6_RTHDRDSTOPTS:
2761                         newdest = &opt->ip6po_dest1;
2762                         break;
2763                 case IPV6_DSTOPTS:
2764                         newdest = &opt->ip6po_dest2;
2765                         break;
2766                 }
2767
2768                 /* turn off the previous option, then set the new option. */
2769                 ip6_clearpktopts(opt, optname);
2770                 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
2771                 if (*newdest == NULL)
2772                         return (ENOBUFS);
2773                 bcopy(dest, *newdest, destlen);
2774
2775                 break;
2776         }
2777
2778         case IPV6_2292RTHDR:
2779         case IPV6_RTHDR:
2780         {
2781                 struct ip6_rthdr *rth;
2782                 int rthlen;
2783
2784                 if (len == 0) {
2785                         ip6_clearpktopts(opt, IPV6_RTHDR);
2786                         break;  /* just remove the option */
2787                 }
2788
2789                 /* message length validation */
2790                 if (len < sizeof(struct ip6_rthdr))
2791                         return (EINVAL);
2792                 rth = (struct ip6_rthdr *)buf;
2793                 rthlen = (rth->ip6r_len + 1) << 3;
2794                 if (len != rthlen)
2795                         return (EINVAL);
2796
2797                 switch (rth->ip6r_type) {
2798                 case IPV6_RTHDR_TYPE_0:
2799                         if (rth->ip6r_len == 0) /* must contain one addr */
2800                                 return (EINVAL);
2801                         if (rth->ip6r_len % 2) /* length must be even */
2802                                 return (EINVAL);
2803                         if (rth->ip6r_len / 2 != rth->ip6r_segleft)
2804                                 return (EINVAL);
2805                         break;
2806                 default:
2807                         return (EINVAL);        /* not supported */
2808                 }
2809
2810                 /* turn off the previous option */
2811                 ip6_clearpktopts(opt, IPV6_RTHDR);
2812                 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
2813                 if (opt->ip6po_rthdr == NULL)
2814                         return (ENOBUFS);
2815                 bcopy(rth, opt->ip6po_rthdr, rthlen);
2816
2817                 break;
2818         }
2819
2820         case IPV6_USE_MIN_MTU:
2821                 if (len != sizeof(int))
2822                         return (EINVAL);
2823                 minmtupolicy = *(int *)buf;
2824                 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
2825                     minmtupolicy != IP6PO_MINMTU_DISABLE &&
2826                     minmtupolicy != IP6PO_MINMTU_ALL) {
2827                         return (EINVAL);
2828                 }
2829                 opt->ip6po_minmtu = minmtupolicy;
2830                 break;
2831
2832         case IPV6_DONTFRAG:
2833                 if (len != sizeof(int))
2834                         return (EINVAL);
2835
2836                 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
2837                         /*
2838                          * we ignore this option for TCP sockets.
2839                          * (RFC3542 leaves this case unspecified.)
2840                          */
2841                         opt->ip6po_flags &= ~IP6PO_DONTFRAG;
2842                 } else
2843                         opt->ip6po_flags |= IP6PO_DONTFRAG;
2844                 break;
2845
2846         case IPV6_PREFER_TEMPADDR:
2847                 if (len != sizeof(int))
2848                         return (EINVAL);
2849                 preftemp = *(int *)buf;
2850                 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
2851                     preftemp != IP6PO_TEMPADDR_NOTPREFER &&
2852                     preftemp != IP6PO_TEMPADDR_PREFER) {
2853                         return (EINVAL);
2854                 }
2855                 opt->ip6po_prefer_tempaddr = preftemp;
2856                 break;
2857
2858         default:
2859                 return (ENOPROTOOPT);
2860         } /* end of switch */
2861
2862         return (0);
2863 }
2864
2865 /*
2866  * Routine called from ip6_output() to loop back a copy of an IP6 multicast
2867  * packet to the input queue of a specified interface.  Note that this
2868  * calls the output routine of the loopback "driver", but with an interface
2869  * pointer that might NOT be &loif -- easier than replicating that code here.
2870  */
2871 void
2872 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst)
2873 {
2874         struct mbuf *copym;
2875         struct ip6_hdr *ip6;
2876
2877         copym = m_copy(m, 0, M_COPYALL);
2878         if (copym == NULL)
2879                 return;
2880
2881         /*
2882          * Make sure to deep-copy IPv6 header portion in case the data
2883          * is in an mbuf cluster, so that we can safely override the IPv6
2884          * header portion later.
2885          */
2886         if ((copym->m_flags & M_EXT) != 0 ||
2887             copym->m_len < sizeof(struct ip6_hdr)) {
2888                 copym = m_pullup(copym, sizeof(struct ip6_hdr));
2889                 if (copym == NULL)
2890                         return;
2891         }
2892
2893 #ifdef DIAGNOSTIC
2894         if (copym->m_len < sizeof(*ip6)) {
2895                 m_freem(copym);
2896                 return;
2897         }
2898 #endif
2899
2900         ip6 = mtod(copym, struct ip6_hdr *);
2901         /*
2902          * clear embedded scope identifiers if necessary.
2903          * in6_clearscope will touch the addresses only when necessary.
2904          */
2905         in6_clearscope(&ip6->ip6_src);
2906         in6_clearscope(&ip6->ip6_dst);
2907
2908         (void)if_simloop(ifp, copym, dst->sin6_family, 0);
2909 }
2910
2911 /*
2912  * Chop IPv6 header off from the payload.
2913  */
2914 static int
2915 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
2916 {
2917         struct mbuf *mh;
2918         struct ip6_hdr *ip6;
2919
2920         ip6 = mtod(m, struct ip6_hdr *);
2921         if (m->m_len > sizeof(*ip6)) {
2922                 mh = m_gethdr(M_NOWAIT, MT_DATA);
2923                 if (mh == NULL) {
2924                         m_freem(m);
2925                         return ENOBUFS;
2926                 }
2927                 m_move_pkthdr(mh, m);
2928                 MH_ALIGN(mh, sizeof(*ip6));
2929                 m->m_len -= sizeof(*ip6);
2930                 m->m_data += sizeof(*ip6);
2931                 mh->m_next = m;
2932                 m = mh;
2933                 m->m_len = sizeof(*ip6);
2934                 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
2935         }
2936         exthdrs->ip6e_ip6 = m;
2937         return 0;
2938 }
2939
2940 /*
2941  * Compute IPv6 extension header length.
2942  */
2943 int
2944 ip6_optlen(struct inpcb *in6p)
2945 {
2946         int len;
2947
2948         if (!in6p->in6p_outputopts)
2949                 return 0;
2950
2951         len = 0;
2952 #define elen(x) \
2953     (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
2954
2955         len += elen(in6p->in6p_outputopts->ip6po_hbh);
2956         if (in6p->in6p_outputopts->ip6po_rthdr)
2957                 /* dest1 is valid with rthdr only */
2958                 len += elen(in6p->in6p_outputopts->ip6po_dest1);
2959         len += elen(in6p->in6p_outputopts->ip6po_rthdr);
2960         len += elen(in6p->in6p_outputopts->ip6po_dest2);
2961         return len;
2962 #undef elen
2963 }