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