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