sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #ifdef INET6
  38 #include <sys/proc.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_var.h>
  42 #ifdef INET6
  43 #include <netinet6/sctp6_var.h>
  44 #endif
  45 #include <netinet/sctp_sysctl.h>
  46 #include <netinet/sctp_output.h>
  47 #include <netinet/sctp_uio.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctputil.h>
  50 #include <netinet/sctp_indata.h>
  51 #include <netinet/sctp_timer.h>
  52 #include <netinet/sctp_auth.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_output.h>
  55 #include <netinet/sctp_bsd_addr.h>
  56 #include <netinet/sctp_crc32.h>
  57 #include <netinet/udp.h>
  58
  59 #ifdef IPSEC
  60 #include <netipsec/ipsec.h>
  61 #ifdef INET6
  62 #include <netipsec/ipsec6.h>
  63 #endif                          /* INET6 */
  64 #endif                          /* IPSEC */
  65
  66 extern struct protosw inetsw[];
  67
  68 int
  69 sctp6_input(struct mbuf **i_pak, int *offp, int proto)
  70 {
  71         struct mbuf *m;
  72         int iphlen;
  73         uint32_t vrf_id = 0;
  74         uint8_t ecn_bits;
  75         struct sockaddr_in6 src, dst;
  76         struct ip6_hdr *ip6;
  77         struct sctphdr *sh;
  78         struct sctp_chunkhdr *ch;
  79         struct sctp_inpcb *inp = NULL;
  80         struct sctp_tcb *stcb = NULL;
  81         struct sctp_nets *net = NULL;
  82         int refcount_up = 0;
  83         int length, offset;
  84         uint32_t mflowid;
  85         uint8_t use_mflowid;
  86
  87 #if !defined(SCTP_WITH_NO_CSUM)
  88         uint32_t check, calc_check;
  89
  90 #endif
  91         uint16_t port = 0;
  92
  93         iphlen = *offp;
  94         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  95                 SCTP_RELEASE_PKT(*i_pak);
  96                 return (IPPROTO_DONE);
  97         }
  98         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  99 #ifdef SCTP_MBUF_LOGGING
 100         /* Log in any input mbufs */
 101         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 102                 struct mbuf *mat;
 103
 104                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
 105                         if (SCTP_BUF_IS_EXTENDED(mat)) {
 106                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
 107                         }
 108                 }
 109         }
 110 #endif
 111 #ifdef SCTP_PACKET_LOGGING
 112         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
 113                 sctp_packet_log(m);
 114         }
 115 #endif
 116         if (m->m_flags & M_FLOWID) {
 117                 mflowid = m->m_pkthdr.flowid;
 118                 use_mflowid = 1;
 119         } else {
 120                 mflowid = 0;
 121                 use_mflowid = 0;
 122         }
 123         SCTP_STAT_INCR(sctps_recvpackets);
 124         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 125         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 126         ip6 = mtod(m, struct ip6_hdr *);
 127         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 128         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 129             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 130         if (sh == NULL) {
 131                 SCTP_STAT_INCR(sctps_hdrops);
 132                 return (IPPROTO_DONE);
 133         }
 134         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 135         offset -= sizeof(struct sctp_chunkhdr);
 136         memset(&src, 0, sizeof(struct sockaddr_in6));
 137         src.sin6_family = AF_INET6;
 138         src.sin6_len = sizeof(struct sockaddr_in6);
 139         src.sin6_port = sh->src_port;
 140         src.sin6_addr = ip6->ip6_src;
 141         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 142                 goto bad;
 143         }
 144         memset(&dst, 0, sizeof(struct sockaddr_in6));
 145         dst.sin6_family = AF_INET6;
 146         dst.sin6_len = sizeof(struct sockaddr_in6);
 147         dst.sin6_port = sh->dest_port;
 148         dst.sin6_addr = ip6->ip6_dst;
 149         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 150                 goto bad;
 151         }
 152         if (faithprefix_p != NULL && (*faithprefix_p) (&dst.sin6_addr)) {
 153                 /* XXX send icmp6 host/port unreach? */
 154                 goto bad;
 155         }
 156         length = ntohs(ip6->ip6_plen) + iphlen;
 157         /* Validate mbuf chain length with IP payload length. */
 158         if (SCTP_HEADER_LEN(*i_pak) != length) {
 159                 SCTPDBG(SCTP_DEBUG_INPUT1,
 160                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(*i_pak));
 161                 SCTP_STAT_INCR(sctps_hdrops);
 162                 goto bad;
 163         }
 164         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 165                 goto bad;
 166         }
 167         SCTPDBG(SCTP_DEBUG_INPUT1,
 168             "sctp6_input() length:%d iphlen:%d\n", length, iphlen);
 169         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 170             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
 171             m->m_pkthdr.len,
 172             if_name(m->m_pkthdr.rcvif),
 173             m->m_pkthdr.csum_flags);
 174 #if defined(SCTP_WITH_NO_CSUM)
 175         SCTP_STAT_INCR(sctps_recvnocrc);
 176 #else
 177         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 178                 SCTP_STAT_INCR(sctps_recvhwcrc);
 179                 goto sctp_skip_csum;
 180         }
 181         check = sh->checksum;
 182         sh->checksum = 0;
 183         calc_check = sctp_calculate_cksum(m, iphlen);
 184         sh->checksum = check;
 185         SCTP_STAT_INCR(sctps_recvswcrc);
 186         if (calc_check != check) {
 187                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
 188                     calc_check, check, m, length, iphlen);
 189                 stcb = sctp_findassociation_addr(m, offset,
 190                     (struct sockaddr *)&src,
 191                     (struct sockaddr *)&dst,
 192                     sh, ch, &inp, &net, vrf_id);
 193                 if ((net) && (port)) {
 194                         if (net->port == 0) {
 195                                 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
 196                         }
 197                         net->port = port;
 198                 }
 199                 if ((net != NULL) && (use_mflowid != 0)) {
 200                         net->flowid = mflowid;
 201 #ifdef INVARIANTS
 202                         net->flowidset = 1;
 203 #endif
 204                 }
 205                 if ((inp) && (stcb)) {
 206                         sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
 207                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 208                 } else if ((inp != NULL) && (stcb == NULL)) {
 209                         refcount_up = 1;
 210                 }
 211                 SCTP_STAT_INCR(sctps_badsum);
 212                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 213                 goto bad;
 214         }
 215 sctp_skip_csum:
 216 #endif
 217         /* destination port of 0 is illegal, based on RFC2960. */
 218         if (sh->dest_port == 0) {
 219                 SCTP_STAT_INCR(sctps_hdrops);
 220                 goto bad;
 221         }
 222         stcb = sctp_findassociation_addr(m, offset,
 223             (struct sockaddr *)&src,
 224             (struct sockaddr *)&dst,
 225             sh, ch, &inp, &net, vrf_id);
 226         if ((net) && (port)) {
 227                 if (net->port == 0) {
 228                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
 229                 }
 230                 net->port = port;
 231         }
 232         if ((net != NULL) && (use_mflowid != 0)) {
 233                 net->flowid = mflowid;
 234 #ifdef INVARIANTS
 235                 net->flowidset = 1;
 236 #endif
 237         }
 238         if (inp == NULL) {
 239                 SCTP_STAT_INCR(sctps_noport);
 240                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0)
 241                         goto bad;
 242                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 243                         sctp_send_shutdown_complete2((struct sockaddr *)&src,
 244                             (struct sockaddr *)&dst,
 245                             sh,
 246                             use_mflowid, mflowid,
 247                             vrf_id, port);
 248                         goto bad;
 249                 }
 250                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 251                         goto bad;
 252                 }
 253                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
 254                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
 255                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
 256                             (ch->chunk_type != SCTP_INIT))) {
 257                                 sctp_send_abort(m, iphlen,
 258                                     (struct sockaddr *)&src,
 259                                     (struct sockaddr *)&dst,
 260                                     sh, 0, NULL,
 261                                     use_mflowid, mflowid,
 262                                     vrf_id, port);
 263                         }
 264                 }
 265                 goto bad;
 266         } else if (stcb == NULL) {
 267                 refcount_up = 1;
 268         }
 269 #ifdef IPSEC
 270         /*-
 271          * I very much doubt any of the IPSEC stuff will work but I have no
 272          * idea, so I will leave it in place.
 273          */
 274         if (inp && ipsec6_in_reject(m, &inp->ip_inp.inp)) {
 275                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
 276                 SCTP_STAT_INCR(sctps_hdrops);
 277                 goto bad;
 278         }
 279 #endif
 280
 281         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 282         /* sa_ignore NO_NULL_CHK */
 283         sctp_common_input_processing(&m, iphlen, offset, length,
 284             (struct sockaddr *)&src,
 285             (struct sockaddr *)&dst,
 286             sh, ch, inp, stcb, net, ecn_bits,
 287             use_mflowid, mflowid,
 288             vrf_id, port);
 289         if (m) {
 290                 sctp_m_freem(m);
 291         }
 292         if ((inp) && (refcount_up)) {
 293                 /* reduce ref-count */
 294                 SCTP_INP_WLOCK(inp);
 295                 SCTP_INP_DECR_REF(inp);
 296                 SCTP_INP_WUNLOCK(inp);
 297         }
 298         return (IPPROTO_DONE);
 299 bad:
 300         if (stcb) {
 301                 SCTP_TCB_UNLOCK(stcb);
 302         }
 303         if ((inp) && (refcount_up)) {
 304                 /* reduce ref-count */
 305                 SCTP_INP_WLOCK(inp);
 306                 SCTP_INP_DECR_REF(inp);
 307                 SCTP_INP_WUNLOCK(inp);
 308         }
 309         if (m) {
 310                 sctp_m_freem(m);
 311         }
 312         return (IPPROTO_DONE);
 313 }
 314
 315
 316 static void
 317 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 318     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 319 {
 320         uint32_t nxtsz;
 321
 322         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 323             (icmp6 == NULL) || (sh == NULL)) {
 324                 goto out;
 325         }
 326         /* First do we even look at it? */
 327         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 328                 goto out;
 329
 330         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 331                 /* not PACKET TO BIG */
 332                 goto out;
 333         }
 334         /*
 335          * ok we need to look closely. We could even get smarter and look at
 336          * anyone that we sent to in case we get a different ICMP that tells
 337          * us there is no way to reach a host, but for this impl, all we
 338          * care about is MTU discovery.
 339          */
 340         nxtsz = ntohl(icmp6->icmp6_mtu);
 341         /* Stop any PMTU timer */
 342         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 343
 344         /* Adjust destination size limit */
 345         if (net->mtu > nxtsz) {
 346                 net->mtu = nxtsz;
 347                 if (net->port) {
 348                         net->mtu -= sizeof(struct udphdr);
 349                 }
 350         }
 351         /* now what about the ep? */
 352         if (stcb->asoc.smallest_mtu > nxtsz) {
 353                 struct sctp_tmit_chunk *chk;
 354
 355                 /* Adjust that too */
 356                 stcb->asoc.smallest_mtu = nxtsz;
 357                 /* now off to subtract IP_DF flag if needed */
 358
 359                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 360                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 361                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 362                         }
 363                 }
 364                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 365                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 366                                 /*
 367                                  * For this guy we also mark for immediate
 368                                  * resend since we sent to big of chunk
 369                                  */
 370                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 371                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 372                                         stcb->asoc.sent_queue_retran_cnt++;
 373                                 chk->sent = SCTP_DATAGRAM_RESEND;
 374                                 chk->rec.data.doing_fast_retransmit = 0;
 375
 376                                 chk->sent = SCTP_DATAGRAM_RESEND;
 377                                 /* Clear any time so NO RTT is being done */
 378                                 chk->sent_rcv_time.tv_sec = 0;
 379                                 chk->sent_rcv_time.tv_usec = 0;
 380                                 stcb->asoc.total_flight -= chk->send_size;
 381                                 net->flight_size -= chk->send_size;
 382                         }
 383                 }
 384         }
 385         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 386 out:
 387         if (stcb) {
 388                 SCTP_TCB_UNLOCK(stcb);
 389         }
 390 }
 391
 392
 393 void
 394 sctp6_notify(struct sctp_inpcb *inp,
 395     struct icmp6_hdr *icmph,
 396     struct sctphdr *sh,
 397     struct sockaddr *to,
 398     struct sctp_tcb *stcb,
 399     struct sctp_nets *net)
 400 {
 401 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 402         struct socket *so;
 403
 404 #endif
 405
 406         /* protection */
 407         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 408             (sh == NULL) || (to == NULL)) {
 409                 if (stcb)
 410                         SCTP_TCB_UNLOCK(stcb);
 411                 return;
 412         }
 413         /* First job is to verify the vtag matches what I would send */
 414         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 415                 SCTP_TCB_UNLOCK(stcb);
 416                 return;
 417         }
 418         if (icmph->icmp6_type != ICMP_UNREACH) {
 419                 /* We only care about unreachable */
 420                 SCTP_TCB_UNLOCK(stcb);
 421                 return;
 422         }
 423         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 424             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 425             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 426             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 427             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 428             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 429             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 430             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 431
 432                 /*
 433                  * Hmm reachablity problems we must examine closely. If its
 434                  * not reachable, we may have lost a network. Or if there is
 435                  * NO protocol at the other end named SCTP. well we consider
 436                  * it a OOTB abort.
 437                  */
 438                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 439                         /* Ok that destination is NOT reachable */
 440                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 441                         net->dest_state &= ~SCTP_ADDR_PF;
 442                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 443                             stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 444                 }
 445                 SCTP_TCB_UNLOCK(stcb);
 446         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 447             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 448                 /*
 449                  * Here the peer is either playing tricks on us, including
 450                  * an address that belongs to someone who does not support
 451                  * SCTP OR was a userland implementation that shutdown and
 452                  * now is dead. In either case treat it like a OOTB abort
 453                  * with no TCB
 454                  */
 455                 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 456 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 457                 so = SCTP_INP_SO(inp);
 458                 atomic_add_int(&stcb->asoc.refcnt, 1);
 459                 SCTP_TCB_UNLOCK(stcb);
 460                 SCTP_SOCKET_LOCK(so, 1);
 461                 SCTP_TCB_LOCK(stcb);
 462                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 463 #endif
 464                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 465 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 466                 SCTP_SOCKET_UNLOCK(so, 1);
 467                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 468 #endif
 469                 /* no need to unlock here, since the TCB is gone */
 470         } else {
 471                 SCTP_TCB_UNLOCK(stcb);
 472         }
 473 }
 474
 475
 476
 477 void
 478 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 479 {
 480         struct sctphdr sh;
 481         struct ip6ctlparam *ip6cp = NULL;
 482         uint32_t vrf_id;
 483
 484         vrf_id = SCTP_DEFAULT_VRFID;
 485
 486         if (pktdst->sa_family != AF_INET6 ||
 487             pktdst->sa_len != sizeof(struct sockaddr_in6))
 488                 return;
 489
 490         if ((unsigned)cmd >= PRC_NCMDS)
 491                 return;
 492         if (PRC_IS_REDIRECT(cmd)) {
 493                 d = NULL;
 494         } else if (inet6ctlerrmap[cmd] == 0) {
 495                 return;
 496         }
 497         /* if the parameter is from icmp6, decode it. */
 498         if (d != NULL) {
 499                 ip6cp = (struct ip6ctlparam *)d;
 500         } else {
 501                 ip6cp = (struct ip6ctlparam *)NULL;
 502         }
 503
 504         if (ip6cp) {
 505                 /*
 506                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 507                  * valid.
 508                  */
 509                 /* check if we can safely examine src and dst ports */
 510                 struct sctp_inpcb *inp = NULL;
 511                 struct sctp_tcb *stcb = NULL;
 512                 struct sctp_nets *net = NULL;
 513                 struct sockaddr_in6 final;
 514
 515                 if (ip6cp->ip6c_m == NULL)
 516                         return;
 517
 518                 bzero(&sh, sizeof(sh));
 519                 bzero(&final, sizeof(final));
 520                 inp = NULL;
 521                 net = NULL;
 522                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 523                     (caddr_t)&sh);
 524                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 525                 final.sin6_len = sizeof(final);
 526                 final.sin6_family = AF_INET6;
 527                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 528                 final.sin6_port = sh.dest_port;
 529                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
 530                     (struct sockaddr *)ip6cp->ip6c_src,
 531                     &inp, &net, 1, vrf_id);
 532                 /* inp's ref-count increased && stcb locked */
 533                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 534                         if (cmd == PRC_MSGSIZE) {
 535                                 sctp6_notify_mbuf(inp,
 536                                     ip6cp->ip6c_icmp6,
 537                                     &sh,
 538                                     stcb,
 539                                     net);
 540                                 /* inp's ref-count reduced && stcb unlocked */
 541                         } else {
 542                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 543                                     (struct sockaddr *)&final,
 544                                     stcb, net);
 545                                 /* inp's ref-count reduced && stcb unlocked */
 546                         }
 547                 } else {
 548                         if (PRC_IS_REDIRECT(cmd) && inp) {
 549                                 in6_rtchange((struct in6pcb *)inp,
 550                                     inet6ctlerrmap[cmd]);
 551                         }
 552                         if (inp) {
 553                                 /* reduce inp's ref-count */
 554                                 SCTP_INP_WLOCK(inp);
 555                                 SCTP_INP_DECR_REF(inp);
 556                                 SCTP_INP_WUNLOCK(inp);
 557                         }
 558                         if (stcb)
 559                                 SCTP_TCB_UNLOCK(stcb);
 560                 }
 561         }
 562 }
 563
 564 /*
 565  * this routine can probably be collasped into the one in sctp_userreq.c
 566  * since they do the same thing and now we lookup with a sockaddr
 567  */
 568 static int
 569 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 570 {
 571         struct xucred xuc;
 572         struct sockaddr_in6 addrs[2];
 573         struct sctp_inpcb *inp;
 574         struct sctp_nets *net;
 575         struct sctp_tcb *stcb;
 576         int error;
 577         uint32_t vrf_id;
 578
 579         vrf_id = SCTP_DEFAULT_VRFID;
 580
 581         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 582         if (error)
 583                 return (error);
 584
 585         if (req->newlen != sizeof(addrs)) {
 586                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 587                 return (EINVAL);
 588         }
 589         if (req->oldlen != sizeof(struct ucred)) {
 590                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 591                 return (EINVAL);
 592         }
 593         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 594         if (error)
 595                 return (error);
 596
 597         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 598             sin6tosa(&addrs[0]),
 599             &inp, &net, 1, vrf_id);
 600         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 601                 if ((inp != NULL) && (stcb == NULL)) {
 602                         /* reduce ref-count */
 603                         SCTP_INP_WLOCK(inp);
 604                         SCTP_INP_DECR_REF(inp);
 605                         goto cred_can_cont;
 606                 }
 607                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 608                 error = ENOENT;
 609                 goto out;
 610         }
 611         SCTP_TCB_UNLOCK(stcb);
 612         /*
 613          * We use the write lock here, only since in the error leg we need
 614          * it. If we used RLOCK, then we would have to
 615          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 616          * Better to use higher wlock.
 617          */
 618         SCTP_INP_WLOCK(inp);
 619 cred_can_cont:
 620         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 621         if (error) {
 622                 SCTP_INP_WUNLOCK(inp);
 623                 goto out;
 624         }
 625         cru2x(inp->sctp_socket->so_cred, &xuc);
 626         SCTP_INP_WUNLOCK(inp);
 627         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 628 out:
 629         return (error);
 630 }
 631
 632 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 633     0, 0,
 634     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 635
 636
 637 /* This is the same as the sctp_abort() could be made common */
 638 static void
 639 sctp6_abort(struct socket *so)
 640 {
 641         struct sctp_inpcb *inp;
 642         uint32_t flags;
 643
 644         inp = (struct sctp_inpcb *)so->so_pcb;
 645         if (inp == NULL) {
 646                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 647                 return;
 648         }
 649 sctp_must_try_again:
 650         flags = inp->sctp_flags;
 651 #ifdef SCTP_LOG_CLOSING
 652         sctp_log_closing(inp, NULL, 17);
 653 #endif
 654         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 655             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 656 #ifdef SCTP_LOG_CLOSING
 657                 sctp_log_closing(inp, NULL, 16);
 658 #endif
 659                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 660                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 661                 SOCK_LOCK(so);
 662                 SCTP_SB_CLEAR(so->so_snd);
 663                 /*
 664                  * same for the rcv ones, they are only here for the
 665                  * accounting/select.
 666                  */
 667                 SCTP_SB_CLEAR(so->so_rcv);
 668                 /* Now null out the reference, we are completely detached. */
 669                 so->so_pcb = NULL;
 670                 SOCK_UNLOCK(so);
 671         } else {
 672                 flags = inp->sctp_flags;
 673                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 674                         goto sctp_must_try_again;
 675                 }
 676         }
 677         return;
 678 }
 679
 680 static int
 681 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 682 {
 683         struct in6pcb *inp6;
 684         int error;
 685         struct sctp_inpcb *inp;
 686         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 687
 688         inp = (struct sctp_inpcb *)so->so_pcb;
 689         if (inp != NULL) {
 690                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 691                 return (EINVAL);
 692         }
 693         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 694                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 695                 if (error)
 696                         return (error);
 697         }
 698         error = sctp_inpcb_alloc(so, vrf_id);
 699         if (error)
 700                 return (error);
 701         inp = (struct sctp_inpcb *)so->so_pcb;
 702         SCTP_INP_WLOCK(inp);
 703         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 704         inp6 = (struct in6pcb *)inp;
 705
 706         inp6->inp_vflag |= INP_IPV6;
 707         inp6->in6p_hops = -1;   /* use kernel default */
 708         inp6->in6p_cksum = -1;  /* just to be sure */
 709 #ifdef INET
 710         /*
 711          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 712          * socket as well, because the socket may be bound to an IPv6
 713          * wildcard address, which may match an IPv4-mapped IPv6 address.
 714          */
 715         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 716 #endif
 717         /*
 718          * Hmm what about the IPSEC stuff that is missing here but in
 719          * sctp_attach()?
 720          */
 721         SCTP_INP_WUNLOCK(inp);
 722         return (0);
 723 }
 724
 725 static int
 726 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 727 {
 728         struct sctp_inpcb *inp;
 729         struct in6pcb *inp6;
 730         int error;
 731
 732         inp = (struct sctp_inpcb *)so->so_pcb;
 733         if (inp == NULL) {
 734                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 735                 return (EINVAL);
 736         }
 737         if (addr) {
 738                 switch (addr->sa_family) {
 739 #ifdef INET
 740                 case AF_INET:
 741                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 742                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 743                                 return (EINVAL);
 744                         }
 745                         break;
 746 #endif
 747 #ifdef INET6
 748                 case AF_INET6:
 749                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 750                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 751                                 return (EINVAL);
 752                         }
 753                         break;
 754 #endif
 755                 default:
 756                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 757                         return (EINVAL);
 758                 }
 759         }
 760         inp6 = (struct in6pcb *)inp;
 761         inp6->inp_vflag &= ~INP_IPV4;
 762         inp6->inp_vflag |= INP_IPV6;
 763         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 764                 switch (addr->sa_family) {
 765 #ifdef INET
 766                 case AF_INET:
 767                         /* binding v4 addr to v6 socket, so reset flags */
 768                         inp6->inp_vflag |= INP_IPV4;
 769                         inp6->inp_vflag &= ~INP_IPV6;
 770                         break;
 771 #endif
 772 #ifdef INET6
 773                 case AF_INET6:
 774                         {
 775                                 struct sockaddr_in6 *sin6_p;
 776
 777                                 sin6_p = (struct sockaddr_in6 *)addr;
 778
 779                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 780                                         inp6->inp_vflag |= INP_IPV4;
 781                                 }
 782 #ifdef INET
 783                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 784                                         struct sockaddr_in sin;
 785
 786                                         in6_sin6_2_sin(&sin, sin6_p);
 787                                         inp6->inp_vflag |= INP_IPV4;
 788                                         inp6->inp_vflag &= ~INP_IPV6;
 789                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 790                                         return (error);
 791                                 }
 792 #endif
 793                                 break;
 794                         }
 795 #endif
 796                 default:
 797                         break;
 798                 }
 799         } else if (addr != NULL) {
 800                 struct sockaddr_in6 *sin6_p;
 801
 802                 /* IPV6_V6ONLY socket */
 803 #ifdef INET
 804                 if (addr->sa_family == AF_INET) {
 805                         /* can't bind v4 addr to v6 only socket! */
 806                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 807                         return (EINVAL);
 808                 }
 809 #endif
 810                 sin6_p = (struct sockaddr_in6 *)addr;
 811
 812                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 813                         /* can't bind v4-mapped addrs either! */
 814                         /* NOTE: we don't support SIIT */
 815                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 816                         return (EINVAL);
 817                 }
 818         }
 819         error = sctp_inpcb_bind(so, addr, NULL, p);
 820         return (error);
 821 }
 822
 823
 824 static void
 825 sctp6_close(struct socket *so)
 826 {
 827         sctp_close(so);
 828 }
 829
 830 /* This could be made common with sctp_detach() since they are identical */
 831
 832 static
 833 int
 834 sctp6_disconnect(struct socket *so)
 835 {
 836         return (sctp_disconnect(so));
 837 }
 838
 839
 840 int
 841 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 842     struct mbuf *control, struct thread *p);
 843
 844
 845 static int
 846 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 847     struct mbuf *control, struct thread *p)
 848 {
 849         struct sctp_inpcb *inp;
 850         struct in6pcb *inp6;
 851
 852 #ifdef INET
 853         struct sockaddr_in6 *sin6;
 854
 855 #endif                          /* INET */
 856         /* No SPL needed since sctp_output does this */
 857
 858         inp = (struct sctp_inpcb *)so->so_pcb;
 859         if (inp == NULL) {
 860                 if (control) {
 861                         SCTP_RELEASE_PKT(control);
 862                         control = NULL;
 863                 }
 864                 SCTP_RELEASE_PKT(m);
 865                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 866                 return (EINVAL);
 867         }
 868         inp6 = (struct in6pcb *)inp;
 869         /*
 870          * For the TCP model we may get a NULL addr, if we are a connected
 871          * socket thats ok.
 872          */
 873         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 874             (addr == NULL)) {
 875                 goto connected_type;
 876         }
 877         if (addr == NULL) {
 878                 SCTP_RELEASE_PKT(m);
 879                 if (control) {
 880                         SCTP_RELEASE_PKT(control);
 881                         control = NULL;
 882                 }
 883                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 884                 return (EDESTADDRREQ);
 885         }
 886 #ifdef INET
 887         sin6 = (struct sockaddr_in6 *)addr;
 888         if (SCTP_IPV6_V6ONLY(inp6)) {
 889                 /*
 890                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 891                  * v4 addr or v4-mapped addr
 892                  */
 893                 if (addr->sa_family == AF_INET) {
 894                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 895                         return (EINVAL);
 896                 }
 897                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 898                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 899                         return (EINVAL);
 900                 }
 901         }
 902         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 903                 if (!MODULE_GLOBAL(ip6_v6only)) {
 904                         struct sockaddr_in sin;
 905
 906                         /* convert v4-mapped into v4 addr and send */
 907                         in6_sin6_2_sin(&sin, sin6);
 908                         return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 909                             control, p));
 910                 } else {
 911                         /* mapped addresses aren't enabled */
 912                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 913                         return (EINVAL);
 914                 }
 915         }
 916 #endif                          /* INET */
 917 connected_type:
 918         /* now what about control */
 919         if (control) {
 920                 if (inp->control) {
 921                         SCTP_PRINTF("huh? control set?\n");
 922                         SCTP_RELEASE_PKT(inp->control);
 923                         inp->control = NULL;
 924                 }
 925                 inp->control = control;
 926         }
 927         /* Place the data */
 928         if (inp->pkt) {
 929                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 930                 inp->pkt_last = m;
 931         } else {
 932                 inp->pkt_last = inp->pkt = m;
 933         }
 934         if (
 935         /* FreeBSD and MacOSX uses a flag passed */
 936             ((flags & PRUS_MORETOCOME) == 0)
 937             ) {
 938                 /*
 939                  * note with the current version this code will only be used
 940                  * by OpenBSD, NetBSD and FreeBSD have methods for
 941                  * re-defining sosend() to use sctp_sosend().  One can
 942                  * optionaly switch back to this code (by changing back the
 943                  * defininitions but this is not advisable.
 944                  */
 945                 int ret;
 946
 947                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 948                 inp->pkt = NULL;
 949                 inp->control = NULL;
 950                 return (ret);
 951         } else {
 952                 return (0);
 953         }
 954 }
 955
 956 static int
 957 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 958 {
 959         uint32_t vrf_id;
 960         int error = 0;
 961         struct sctp_inpcb *inp;
 962         struct in6pcb *inp6;
 963         struct sctp_tcb *stcb;
 964
 965 #ifdef INET
 966         struct sockaddr_in6 *sin6;
 967         struct sockaddr_storage ss;
 968
 969 #endif
 970
 971         inp6 = (struct in6pcb *)so->so_pcb;
 972         inp = (struct sctp_inpcb *)so->so_pcb;
 973         if (inp == NULL) {
 974                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 975                 return (ECONNRESET);    /* I made the same as TCP since we are
 976                                          * not setup? */
 977         }
 978         if (addr == NULL) {
 979                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 980                 return (EINVAL);
 981         }
 982         switch (addr->sa_family) {
 983 #ifdef INET
 984         case AF_INET:
 985                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 986                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 987                         return (EINVAL);
 988                 }
 989                 break;
 990 #endif
 991 #ifdef INET6
 992         case AF_INET6:
 993                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 994                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 995                         return (EINVAL);
 996                 }
 997                 break;
 998 #endif
 999         default:
1000                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1001                 return (EINVAL);
1002         }
1003
1004         vrf_id = inp->def_vrf_id;
1005         SCTP_ASOC_CREATE_LOCK(inp);
1006         SCTP_INP_RLOCK(inp);
1007         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
1008             SCTP_PCB_FLAGS_UNBOUND) {
1009                 /* Bind a ephemeral port */
1010                 SCTP_INP_RUNLOCK(inp);
1011                 error = sctp6_bind(so, NULL, p);
1012                 if (error) {
1013                         SCTP_ASOC_CREATE_UNLOCK(inp);
1014
1015                         return (error);
1016                 }
1017                 SCTP_INP_RLOCK(inp);
1018         }
1019         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
1020             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
1021                 /* We are already connected AND the TCP model */
1022                 SCTP_INP_RUNLOCK(inp);
1023                 SCTP_ASOC_CREATE_UNLOCK(inp);
1024                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
1025                 return (EADDRINUSE);
1026         }
1027 #ifdef INET
1028         sin6 = (struct sockaddr_in6 *)addr;
1029         if (SCTP_IPV6_V6ONLY(inp6)) {
1030                 /*
1031                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
1032                  * addr or v4-mapped addr
1033                  */
1034                 if (addr->sa_family == AF_INET) {
1035                         SCTP_INP_RUNLOCK(inp);
1036                         SCTP_ASOC_CREATE_UNLOCK(inp);
1037                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1038                         return (EINVAL);
1039                 }
1040                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1041                         SCTP_INP_RUNLOCK(inp);
1042                         SCTP_ASOC_CREATE_UNLOCK(inp);
1043                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1044                         return (EINVAL);
1045                 }
1046         }
1047         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1048                 if (!MODULE_GLOBAL(ip6_v6only)) {
1049                         /* convert v4-mapped into v4 addr */
1050                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
1051                         addr = (struct sockaddr *)&ss;
1052                 } else {
1053                         /* mapped addresses aren't enabled */
1054                         SCTP_INP_RUNLOCK(inp);
1055                         SCTP_ASOC_CREATE_UNLOCK(inp);
1056                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1057                         return (EINVAL);
1058                 }
1059         }
1060 #endif                          /* INET */
1061         /* Now do we connect? */
1062         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1063                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1064                 if (stcb) {
1065                         SCTP_TCB_UNLOCK(stcb);
1066                 }
1067                 SCTP_INP_RUNLOCK(inp);
1068         } else {
1069                 SCTP_INP_RUNLOCK(inp);
1070                 SCTP_INP_WLOCK(inp);
1071                 SCTP_INP_INCR_REF(inp);
1072                 SCTP_INP_WUNLOCK(inp);
1073                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
1074                 if (stcb == NULL) {
1075                         SCTP_INP_WLOCK(inp);
1076                         SCTP_INP_DECR_REF(inp);
1077                         SCTP_INP_WUNLOCK(inp);
1078                 }
1079         }
1080
1081         if (stcb != NULL) {
1082                 /* Already have or am bring up an association */
1083                 SCTP_ASOC_CREATE_UNLOCK(inp);
1084                 SCTP_TCB_UNLOCK(stcb);
1085                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
1086                 return (EALREADY);
1087         }
1088         /* We are GOOD to go */
1089         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
1090         SCTP_ASOC_CREATE_UNLOCK(inp);
1091         if (stcb == NULL) {
1092                 /* Gak! no memory */
1093                 return (error);
1094         }
1095         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
1096                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1097                 /* Set the connected flag so we can queue data */
1098                 soisconnecting(so);
1099         }
1100         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
1101         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1102
1103         /* initialize authentication parameters for the assoc */
1104         sctp_initialize_auth_params(inp, stcb);
1105
1106         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
1107         SCTP_TCB_UNLOCK(stcb);
1108         return (error);
1109 }
1110
1111 static int
1112 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
1113 {
1114         struct sockaddr_in6 *sin6;
1115         struct sctp_inpcb *inp;
1116         uint32_t vrf_id;
1117         struct sctp_ifa *sctp_ifa;
1118
1119         int error;
1120
1121         /*
1122          * Do the malloc first in case it blocks.
1123          */
1124         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
1125         if (sin6 == NULL)
1126                 return (ENOMEM);
1127         sin6->sin6_family = AF_INET6;
1128         sin6->sin6_len = sizeof(*sin6);
1129
1130         inp = (struct sctp_inpcb *)so->so_pcb;
1131         if (inp == NULL) {
1132                 SCTP_FREE_SONAME(sin6);
1133                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1134                 return (ECONNRESET);
1135         }
1136         SCTP_INP_RLOCK(inp);
1137         sin6->sin6_port = inp->sctp_lport;
1138         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1139                 /* For the bound all case you get back 0 */
1140                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1141                         struct sctp_tcb *stcb;
1142                         struct sockaddr_in6 *sin_a6;
1143                         struct sctp_nets *net;
1144                         int fnd;
1145
1146                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1147                         if (stcb == NULL) {
1148                                 goto notConn6;
1149                         }
1150                         fnd = 0;
1151                         sin_a6 = NULL;
1152                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1153                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1154                                 if (sin_a6 == NULL)
1155                                         /* this will make coverity happy */
1156                                         continue;
1157
1158                                 if (sin_a6->sin6_family == AF_INET6) {
1159                                         fnd = 1;
1160                                         break;
1161                                 }
1162                         }
1163                         if ((!fnd) || (sin_a6 == NULL)) {
1164                                 /* punt */
1165                                 goto notConn6;
1166                         }
1167                         vrf_id = inp->def_vrf_id;
1168                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1169                         if (sctp_ifa) {
1170                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1171                         }
1172                 } else {
1173                         /* For the bound all case you get back 0 */
1174         notConn6:
1175                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1176                 }
1177         } else {
1178                 /* Take the first IPv6 address in the list */
1179                 struct sctp_laddr *laddr;
1180                 int fnd = 0;
1181
1182                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1183                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1184                                 struct sockaddr_in6 *sin_a;
1185
1186                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1187                                 sin6->sin6_addr = sin_a->sin6_addr;
1188                                 fnd = 1;
1189                                 break;
1190                         }
1191                 }
1192                 if (!fnd) {
1193                         SCTP_FREE_SONAME(sin6);
1194                         SCTP_INP_RUNLOCK(inp);
1195                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1196                         return (ENOENT);
1197                 }
1198         }
1199         SCTP_INP_RUNLOCK(inp);
1200         /* Scoping things for v6 */
1201         if ((error = sa6_recoverscope(sin6)) != 0) {
1202                 SCTP_FREE_SONAME(sin6);
1203                 return (error);
1204         }
1205         (*addr) = (struct sockaddr *)sin6;
1206         return (0);
1207 }
1208
1209 static int
1210 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1211 {
1212         struct sockaddr_in6 *sin6;
1213         int fnd;
1214         struct sockaddr_in6 *sin_a6;
1215         struct sctp_inpcb *inp;
1216         struct sctp_tcb *stcb;
1217         struct sctp_nets *net;
1218         int error;
1219
1220         /* Do the malloc first in case it blocks. */
1221         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1222         if (sin6 == NULL)
1223                 return (ENOMEM);
1224         sin6->sin6_family = AF_INET6;
1225         sin6->sin6_len = sizeof(*sin6);
1226
1227         inp = (struct sctp_inpcb *)so->so_pcb;
1228         if ((inp == NULL) ||
1229             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1230                 /* UDP type and listeners will drop out here */
1231                 SCTP_FREE_SONAME(sin6);
1232                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1233                 return (ENOTCONN);
1234         }
1235         SCTP_INP_RLOCK(inp);
1236         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1237         if (stcb) {
1238                 SCTP_TCB_LOCK(stcb);
1239         }
1240         SCTP_INP_RUNLOCK(inp);
1241         if (stcb == NULL) {
1242                 SCTP_FREE_SONAME(sin6);
1243                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1244                 return (ECONNRESET);
1245         }
1246         fnd = 0;
1247         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1248                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1249                 if (sin_a6->sin6_family == AF_INET6) {
1250                         fnd = 1;
1251                         sin6->sin6_port = stcb->rport;
1252                         sin6->sin6_addr = sin_a6->sin6_addr;
1253                         break;
1254                 }
1255         }
1256         SCTP_TCB_UNLOCK(stcb);
1257         if (!fnd) {
1258                 /* No IPv4 address */
1259                 SCTP_FREE_SONAME(sin6);
1260                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1261                 return (ENOENT);
1262         }
1263         if ((error = sa6_recoverscope(sin6)) != 0)
1264                 return (error);
1265         *addr = (struct sockaddr *)sin6;
1266         return (0);
1267 }
1268
1269 static int
1270 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1271 {
1272 #ifdef INET
1273         struct sockaddr *addr;
1274
1275 #endif
1276         struct in6pcb *inp6 = sotoin6pcb(so);
1277         int error;
1278
1279         if (inp6 == NULL) {
1280                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1281                 return (EINVAL);
1282         }
1283         /* allow v6 addresses precedence */
1284         error = sctp6_getaddr(so, nam);
1285 #ifdef INET
1286         if (error) {
1287                 /* try v4 next if v6 failed */
1288                 error = sctp_ingetaddr(so, nam);
1289                 if (error) {
1290                         return (error);
1291                 }
1292                 addr = *nam;
1293                 /* if I'm V6ONLY, convert it to v4-mapped */
1294                 if (SCTP_IPV6_V6ONLY(inp6)) {
1295                         struct sockaddr_in6 sin6;
1296
1297                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1298                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1299                 }
1300         }
1301 #endif
1302         return (error);
1303 }
1304
1305
1306 static int
1307 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1308 {
1309 #ifdef INET
1310         struct sockaddr *addr;
1311
1312 #endif
1313         struct in6pcb *inp6 = sotoin6pcb(so);
1314         int error;
1315
1316         if (inp6 == NULL) {
1317                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1318                 return (EINVAL);
1319         }
1320         /* allow v6 addresses precedence */
1321         error = sctp6_peeraddr(so, nam);
1322 #ifdef INET
1323         if (error) {
1324                 /* try v4 next if v6 failed */
1325                 error = sctp_peeraddr(so, nam);
1326                 if (error) {
1327                         return (error);
1328                 }
1329                 addr = *nam;
1330                 /* if I'm V6ONLY, convert it to v4-mapped */
1331                 if (SCTP_IPV6_V6ONLY(inp6)) {
1332                         struct sockaddr_in6 sin6;
1333
1334                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1335                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1336                 }
1337         }
1338 #endif
1339         return (error);
1340 }
1341
1342 struct pr_usrreqs sctp6_usrreqs = {
1343         .pru_abort = sctp6_abort,
1344         .pru_accept = sctp_accept,
1345         .pru_attach = sctp6_attach,
1346         .pru_bind = sctp6_bind,
1347         .pru_connect = sctp6_connect,
1348         .pru_control = in6_control,
1349         .pru_close = sctp6_close,
1350         .pru_detach = sctp6_close,
1351         .pru_sopoll = sopoll_generic,
1352         .pru_flush = sctp_flush,
1353         .pru_disconnect = sctp6_disconnect,
1354         .pru_listen = sctp_listen,
1355         .pru_peeraddr = sctp6_getpeeraddr,
1356         .pru_send = sctp6_send,
1357         .pru_shutdown = sctp_shutdown,
1358         .pru_sockaddr = sctp6_in6getaddr,
1359         .pru_sosend = sctp_sosend,
1360         .pru_soreceive = sctp_soreceive
1361 };
1362
1363 #endif