sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2011, 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 /*      $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $      */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <netinet/sctp_os.h>
  38 #include <sys/proc.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_var.h>
  42 #if defined(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 #if defined(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         struct ip6_hdr *ip6;
  73         struct sctphdr *sh;
  74         struct sctp_inpcb *in6p = NULL;
  75         struct sctp_nets *net;
  76         int refcount_up = 0;
  77         uint32_t vrf_id = 0;
  78
  79 #ifdef IPSEC
  80         struct inpcb *in6p_ip;
  81
  82 #endif
  83         struct sctp_chunkhdr *ch;
  84         int length, offset, iphlen;
  85         uint8_t ecn_bits;
  86         struct sctp_tcb *stcb = NULL;
  87         int pkt_len = 0;
  88
  89 #if !defined(SCTP_WITH_NO_CSUM)
  90         uint32_t check, calc_check;
  91
  92 #endif
  93         int off = *offp;
  94         uint16_t port = 0;
  95
  96         /* get the VRF and table id's */
  97         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  98                 SCTP_RELEASE_PKT(*i_pak);
  99                 return (-1);
 100         }
 101         m = SCTP_HEADER_TO_CHAIN(*i_pak);
 102         pkt_len = SCTP_HEADER_LEN((*i_pak));
 103
 104 #ifdef  SCTP_PACKET_LOGGING
 105         sctp_packet_log(m, pkt_len);
 106 #endif
 107         ip6 = mtod(m, struct ip6_hdr *);
 108         /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
 109         IP6_EXTHDR_GET(sh, struct sctphdr *, m, off,
 110             (int)(sizeof(*sh) + sizeof(*ch)));
 111         if (sh == NULL) {
 112                 SCTP_STAT_INCR(sctps_hdrops);
 113                 return (IPPROTO_DONE);
 114         }
 115         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 116         iphlen = off;
 117         offset = iphlen + sizeof(*sh) + sizeof(*ch);
 118         SCTPDBG(SCTP_DEBUG_INPUT1,
 119             "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen);
 120
 121
 122 #if defined(NFAITH) && NFAITH > 0
 123
 124         if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
 125                 /* XXX send icmp6 host/port unreach? */
 126                 goto bad;
 127         }
 128 #endif                          /* NFAITH defined and > 0 */
 129         SCTP_STAT_INCR(sctps_recvpackets);
 130         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 131         SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n",
 132             iphlen, pkt_len);
 133         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 134                 /* No multi-cast support in SCTP */
 135                 goto bad;
 136         }
 137         /* destination port of 0 is illegal, based on RFC2960. */
 138         if (sh->dest_port == 0)
 139                 goto bad;
 140
 141         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 142             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
 143             m->m_pkthdr.len,
 144             if_name(m->m_pkthdr.rcvif),
 145             m->m_pkthdr.csum_flags);
 146 #if defined(SCTP_WITH_NO_CSUM)
 147         SCTP_STAT_INCR(sctps_recvnocrc);
 148 #else
 149         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 150                 SCTP_STAT_INCR(sctps_recvhwcrc);
 151                 goto sctp_skip_csum;
 152         }
 153         check = sh->checksum;   /* save incoming checksum */
 154         if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) &&
 155             (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) {
 156                 SCTP_STAT_INCR(sctps_recvnocrc);
 157                 goto sctp_skip_csum;
 158         }
 159         sh->checksum = 0;       /* prepare for calc */
 160         calc_check = sctp_calculate_cksum(m, iphlen);
 161         SCTP_STAT_INCR(sctps_recvswcrc);
 162         if (calc_check != check) {
 163                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p phlen:%d\n",
 164                     calc_check, check, m, iphlen);
 165                 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
 166                     sh, ch, &in6p, &net, vrf_id);
 167                 if ((net) && (port)) {
 168                         if (net->port == 0) {
 169                                 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
 170                         }
 171                         net->port = port;
 172                 }
 173                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
 174                         net->flowid = m->m_pkthdr.flowid;
 175 #ifdef INVARIANTS
 176                         net->flowidset = 1;
 177 #endif
 178                 }
 179                 /* in6p's ref-count increased && stcb locked */
 180                 if ((in6p) && (stcb)) {
 181                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
 182                         sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 183                 } else if ((in6p != NULL) && (stcb == NULL)) {
 184                         refcount_up = 1;
 185                 }
 186                 SCTP_STAT_INCR(sctps_badsum);
 187                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 188                 goto bad;
 189         }
 190         sh->checksum = calc_check;
 191
 192 sctp_skip_csum:
 193 #endif
 194         net = NULL;
 195         /*
 196          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
 197          * IP/SCTP/first chunk header...
 198          */
 199         stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
 200             sh, ch, &in6p, &net, vrf_id);
 201         if ((net) && (port)) {
 202                 if (net->port == 0) {
 203                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
 204                 }
 205                 net->port = port;
 206         }
 207         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
 208                 net->flowid = m->m_pkthdr.flowid;
 209 #ifdef INVARIANTS
 210                 net->flowidset = 1;
 211 #endif
 212         }
 213         /* in6p's ref-count increased */
 214         if (in6p == NULL) {
 215                 struct sctp_init_chunk *init_chk, chunk_buf;
 216
 217                 SCTP_STAT_INCR(sctps_noport);
 218                 if (ch->chunk_type == SCTP_INITIATION) {
 219                         /*
 220                          * we do a trick here to get the INIT tag, dig in
 221                          * and get the tag from the INIT and put it in the
 222                          * common header.
 223                          */
 224                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
 225                             iphlen + sizeof(*sh), sizeof(*init_chk),
 226                             (uint8_t *) & chunk_buf);
 227                         if (init_chk)
 228                                 sh->v_tag = init_chk->init.initiate_tag;
 229                         else
 230                                 sh->v_tag = 0;
 231                 }
 232                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 233                         sctp_send_shutdown_complete2(m, sh, vrf_id, port);
 234                         goto bad;
 235                 }
 236                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 237                         goto bad;
 238                 }
 239                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
 240                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
 241                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
 242                             (ch->chunk_type != SCTP_INIT))) {
 243                                 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
 244                         }
 245                 }
 246                 goto bad;
 247         } else if (stcb == NULL) {
 248                 refcount_up = 1;
 249         }
 250 #ifdef IPSEC
 251         /*
 252          * Check AH/ESP integrity.
 253          */
 254         in6p_ip = (struct inpcb *)in6p;
 255         if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) {
 256 /* XXX */
 257                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
 258                 goto bad;
 259         }
 260 #endif                          /* IPSEC */
 261
 262         /*
 263          * CONTROL chunk processing
 264          */
 265         offset -= sizeof(*ch);
 266         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 267
 268         /* Length now holds the total packet length payload + iphlen */
 269         length = ntohs(ip6->ip6_plen) + iphlen;
 270
 271         /* sa_ignore NO_NULL_CHK */
 272         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
 273             in6p, stcb, net, ecn_bits, vrf_id, port);
 274         /* inp's ref-count reduced && stcb unlocked */
 275         /* XXX this stuff below gets moved to appropriate parts later... */
 276         if (m)
 277                 sctp_m_freem(m);
 278         if ((in6p) && refcount_up) {
 279                 /* reduce ref-count */
 280                 SCTP_INP_WLOCK(in6p);
 281                 SCTP_INP_DECR_REF(in6p);
 282                 SCTP_INP_WUNLOCK(in6p);
 283         }
 284         return (IPPROTO_DONE);
 285
 286 bad:
 287         if (stcb) {
 288                 SCTP_TCB_UNLOCK(stcb);
 289         }
 290         if ((in6p) && refcount_up) {
 291                 /* reduce ref-count */
 292                 SCTP_INP_WLOCK(in6p);
 293                 SCTP_INP_DECR_REF(in6p);
 294                 SCTP_INP_WUNLOCK(in6p);
 295         }
 296         if (m)
 297                 sctp_m_freem(m);
 298         return (IPPROTO_DONE);
 299 }
 300
 301
 302 static void
 303 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 304     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 305 {
 306         uint32_t nxtsz;
 307
 308         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 309             (icmp6 == NULL) || (sh == NULL)) {
 310                 goto out;
 311         }
 312         /* First do we even look at it? */
 313         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 314                 goto out;
 315
 316         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 317                 /* not PACKET TO BIG */
 318                 goto out;
 319         }
 320         /*
 321          * ok we need to look closely. We could even get smarter and look at
 322          * anyone that we sent to in case we get a different ICMP that tells
 323          * us there is no way to reach a host, but for this impl, all we
 324          * care about is MTU discovery.
 325          */
 326         nxtsz = ntohl(icmp6->icmp6_mtu);
 327         /* Stop any PMTU timer */
 328         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 329
 330         /* Adjust destination size limit */
 331         if (net->mtu > nxtsz) {
 332                 net->mtu = nxtsz;
 333                 if (net->port) {
 334                         net->mtu -= sizeof(struct udphdr);
 335                 }
 336         }
 337         /* now what about the ep? */
 338         if (stcb->asoc.smallest_mtu > nxtsz) {
 339                 struct sctp_tmit_chunk *chk;
 340
 341                 /* Adjust that too */
 342                 stcb->asoc.smallest_mtu = nxtsz;
 343                 /* now off to subtract IP_DF flag if needed */
 344
 345                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 346                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 347                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 348                         }
 349                 }
 350                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 351                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 352                                 /*
 353                                  * For this guy we also mark for immediate
 354                                  * resend since we sent to big of chunk
 355                                  */
 356                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 357                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 358                                         stcb->asoc.sent_queue_retran_cnt++;
 359                                 chk->sent = SCTP_DATAGRAM_RESEND;
 360                                 chk->rec.data.doing_fast_retransmit = 0;
 361
 362                                 chk->sent = SCTP_DATAGRAM_RESEND;
 363                                 /* Clear any time so NO RTT is being done */
 364                                 chk->sent_rcv_time.tv_sec = 0;
 365                                 chk->sent_rcv_time.tv_usec = 0;
 366                                 stcb->asoc.total_flight -= chk->send_size;
 367                                 net->flight_size -= chk->send_size;
 368                         }
 369                 }
 370         }
 371         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 372 out:
 373         if (stcb) {
 374                 SCTP_TCB_UNLOCK(stcb);
 375         }
 376 }
 377
 378
 379 void
 380 sctp6_notify(struct sctp_inpcb *inp,
 381     struct icmp6_hdr *icmph,
 382     struct sctphdr *sh,
 383     struct sockaddr *to,
 384     struct sctp_tcb *stcb,
 385     struct sctp_nets *net)
 386 {
 387 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 388         struct socket *so;
 389
 390 #endif
 391
 392         /* protection */
 393         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 394             (sh == NULL) || (to == NULL)) {
 395                 if (stcb)
 396                         SCTP_TCB_UNLOCK(stcb);
 397                 return;
 398         }
 399         /* First job is to verify the vtag matches what I would send */
 400         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 401                 SCTP_TCB_UNLOCK(stcb);
 402                 return;
 403         }
 404         if (icmph->icmp6_type != ICMP_UNREACH) {
 405                 /* We only care about unreachable */
 406                 SCTP_TCB_UNLOCK(stcb);
 407                 return;
 408         }
 409         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 410             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 411             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 412             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 413             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 414             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 415             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 416             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 417
 418                 /*
 419                  * Hmm reachablity problems we must examine closely. If its
 420                  * not reachable, we may have lost a network. Or if there is
 421                  * NO protocol at the other end named SCTP. well we consider
 422                  * it a OOTB abort.
 423                  */
 424                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 425                         /* Ok that destination is NOT reachable */
 426                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 427                         net->dest_state &= ~SCTP_ADDR_PF;
 428                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 429                             stcb, SCTP_FAILED_THRESHOLD,
 430                             (void *)net, SCTP_SO_NOT_LOCKED);
 431                 }
 432                 SCTP_TCB_UNLOCK(stcb);
 433         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 434             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 435                 /*
 436                  * Here the peer is either playing tricks on us, including
 437                  * an address that belongs to someone who does not support
 438                  * SCTP OR was a userland implementation that shutdown and
 439                  * now is dead. In either case treat it like a OOTB abort
 440                  * with no TCB
 441                  */
 442                 sctp_abort_notification(stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 443 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 444                 so = SCTP_INP_SO(inp);
 445                 atomic_add_int(&stcb->asoc.refcnt, 1);
 446                 SCTP_TCB_UNLOCK(stcb);
 447                 SCTP_SOCKET_LOCK(so, 1);
 448                 SCTP_TCB_LOCK(stcb);
 449                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 450 #endif
 451                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 452 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 453                 SCTP_SOCKET_UNLOCK(so, 1);
 454                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 455 #endif
 456                 /* no need to unlock here, since the TCB is gone */
 457         } else {
 458                 SCTP_TCB_UNLOCK(stcb);
 459         }
 460 }
 461
 462
 463
 464 void
 465 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 466 {
 467         struct sctphdr sh;
 468         struct ip6ctlparam *ip6cp = NULL;
 469         uint32_t vrf_id;
 470
 471         vrf_id = SCTP_DEFAULT_VRFID;
 472
 473         if (pktdst->sa_family != AF_INET6 ||
 474             pktdst->sa_len != sizeof(struct sockaddr_in6))
 475                 return;
 476
 477         if ((unsigned)cmd >= PRC_NCMDS)
 478                 return;
 479         if (PRC_IS_REDIRECT(cmd)) {
 480                 d = NULL;
 481         } else if (inet6ctlerrmap[cmd] == 0) {
 482                 return;
 483         }
 484         /* if the parameter is from icmp6, decode it. */
 485         if (d != NULL) {
 486                 ip6cp = (struct ip6ctlparam *)d;
 487         } else {
 488                 ip6cp = (struct ip6ctlparam *)NULL;
 489         }
 490
 491         if (ip6cp) {
 492                 /*
 493                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 494                  * valid.
 495                  */
 496                 /* check if we can safely examine src and dst ports */
 497                 struct sctp_inpcb *inp = NULL;
 498                 struct sctp_tcb *stcb = NULL;
 499                 struct sctp_nets *net = NULL;
 500                 struct sockaddr_in6 final;
 501
 502                 if (ip6cp->ip6c_m == NULL)
 503                         return;
 504
 505                 bzero(&sh, sizeof(sh));
 506                 bzero(&final, sizeof(final));
 507                 inp = NULL;
 508                 net = NULL;
 509                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 510                     (caddr_t)&sh);
 511                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 512                 final.sin6_len = sizeof(final);
 513                 final.sin6_family = AF_INET6;
 514                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 515                 final.sin6_port = sh.dest_port;
 516                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
 517                     (struct sockaddr *)&final,
 518                     &inp, &net, 1, vrf_id);
 519                 /* inp's ref-count increased && stcb locked */
 520                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 521                         if (cmd == PRC_MSGSIZE) {
 522                                 sctp6_notify_mbuf(inp,
 523                                     ip6cp->ip6c_icmp6,
 524                                     &sh,
 525                                     stcb,
 526                                     net);
 527                                 /* inp's ref-count reduced && stcb unlocked */
 528                         } else {
 529                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 530                                     (struct sockaddr *)&final,
 531                                     stcb, net);
 532                                 /* inp's ref-count reduced && stcb unlocked */
 533                         }
 534                 } else {
 535                         if (PRC_IS_REDIRECT(cmd) && inp) {
 536                                 in6_rtchange((struct in6pcb *)inp,
 537                                     inet6ctlerrmap[cmd]);
 538                         }
 539                         if (inp) {
 540                                 /* reduce inp's ref-count */
 541                                 SCTP_INP_WLOCK(inp);
 542                                 SCTP_INP_DECR_REF(inp);
 543                                 SCTP_INP_WUNLOCK(inp);
 544                         }
 545                         if (stcb)
 546                                 SCTP_TCB_UNLOCK(stcb);
 547                 }
 548         }
 549 }
 550
 551 /*
 552  * this routine can probably be collasped into the one in sctp_userreq.c
 553  * since they do the same thing and now we lookup with a sockaddr
 554  */
 555 static int
 556 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 557 {
 558         struct xucred xuc;
 559         struct sockaddr_in6 addrs[2];
 560         struct sctp_inpcb *inp;
 561         struct sctp_nets *net;
 562         struct sctp_tcb *stcb;
 563         int error;
 564         uint32_t vrf_id;
 565
 566         vrf_id = SCTP_DEFAULT_VRFID;
 567
 568         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 569         if (error)
 570                 return (error);
 571
 572         if (req->newlen != sizeof(addrs)) {
 573                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 574                 return (EINVAL);
 575         }
 576         if (req->oldlen != sizeof(struct ucred)) {
 577                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 578                 return (EINVAL);
 579         }
 580         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 581         if (error)
 582                 return (error);
 583
 584         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
 585             sin6tosa(&addrs[1]),
 586             &inp, &net, 1, vrf_id);
 587         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 588                 if ((inp != NULL) && (stcb == NULL)) {
 589                         /* reduce ref-count */
 590                         SCTP_INP_WLOCK(inp);
 591                         SCTP_INP_DECR_REF(inp);
 592                         goto cred_can_cont;
 593                 }
 594                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 595                 error = ENOENT;
 596                 goto out;
 597         }
 598         SCTP_TCB_UNLOCK(stcb);
 599         /*
 600          * We use the write lock here, only since in the error leg we need
 601          * it. If we used RLOCK, then we would have to
 602          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 603          * Better to use higher wlock.
 604          */
 605         SCTP_INP_WLOCK(inp);
 606 cred_can_cont:
 607         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 608         if (error) {
 609                 SCTP_INP_WUNLOCK(inp);
 610                 goto out;
 611         }
 612         cru2x(inp->sctp_socket->so_cred, &xuc);
 613         SCTP_INP_WUNLOCK(inp);
 614         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 615 out:
 616         return (error);
 617 }
 618
 619 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 620     0, 0,
 621     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 622
 623
 624 /* This is the same as the sctp_abort() could be made common */
 625 static void
 626 sctp6_abort(struct socket *so)
 627 {
 628         struct sctp_inpcb *inp;
 629         uint32_t flags;
 630
 631         inp = (struct sctp_inpcb *)so->so_pcb;
 632         if (inp == NULL) {
 633                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 634                 return;
 635         }
 636 sctp_must_try_again:
 637         flags = inp->sctp_flags;
 638 #ifdef SCTP_LOG_CLOSING
 639         sctp_log_closing(inp, NULL, 17);
 640 #endif
 641         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 642             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 643 #ifdef SCTP_LOG_CLOSING
 644                 sctp_log_closing(inp, NULL, 16);
 645 #endif
 646                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 647                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 648                 SOCK_LOCK(so);
 649                 SCTP_SB_CLEAR(so->so_snd);
 650                 /*
 651                  * same for the rcv ones, they are only here for the
 652                  * accounting/select.
 653                  */
 654                 SCTP_SB_CLEAR(so->so_rcv);
 655                 /* Now null out the reference, we are completely detached. */
 656                 so->so_pcb = NULL;
 657                 SOCK_UNLOCK(so);
 658         } else {
 659                 flags = inp->sctp_flags;
 660                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 661                         goto sctp_must_try_again;
 662                 }
 663         }
 664         return;
 665 }
 666
 667 static int
 668 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 669 {
 670         struct in6pcb *inp6;
 671         int error;
 672         struct sctp_inpcb *inp;
 673         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 674
 675         inp = (struct sctp_inpcb *)so->so_pcb;
 676         if (inp != NULL) {
 677                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 678                 return (EINVAL);
 679         }
 680         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 681                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 682                 if (error)
 683                         return (error);
 684         }
 685         error = sctp_inpcb_alloc(so, vrf_id);
 686         if (error)
 687                 return (error);
 688         inp = (struct sctp_inpcb *)so->so_pcb;
 689         SCTP_INP_WLOCK(inp);
 690         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 691         inp6 = (struct in6pcb *)inp;
 692
 693         inp6->inp_vflag |= INP_IPV6;
 694         inp6->in6p_hops = -1;   /* use kernel default */
 695         inp6->in6p_cksum = -1;  /* just to be sure */
 696 #ifdef INET
 697         /*
 698          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 699          * socket as well, because the socket may be bound to an IPv6
 700          * wildcard address, which may match an IPv4-mapped IPv6 address.
 701          */
 702         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 703 #endif
 704         /*
 705          * Hmm what about the IPSEC stuff that is missing here but in
 706          * sctp_attach()?
 707          */
 708         SCTP_INP_WUNLOCK(inp);
 709         return (0);
 710 }
 711
 712 static int
 713 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 714 {
 715         struct sctp_inpcb *inp;
 716         struct in6pcb *inp6;
 717         int error;
 718
 719         inp = (struct sctp_inpcb *)so->so_pcb;
 720         if (inp == NULL) {
 721                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 722                 return (EINVAL);
 723         }
 724         if (addr) {
 725                 switch (addr->sa_family) {
 726 #ifdef INET
 727                 case AF_INET:
 728                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 729                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 730                                 return (EINVAL);
 731                         }
 732                         break;
 733 #endif
 734 #ifdef INET6
 735                 case AF_INET6:
 736                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 737                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 738                                 return (EINVAL);
 739                         }
 740                         break;
 741 #endif
 742                 default:
 743                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 744                         return (EINVAL);
 745                 }
 746         }
 747         inp6 = (struct in6pcb *)inp;
 748         inp6->inp_vflag &= ~INP_IPV4;
 749         inp6->inp_vflag |= INP_IPV6;
 750         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 751                 switch (addr->sa_family) {
 752 #ifdef INET
 753                 case AF_INET:
 754                         /* binding v4 addr to v6 socket, so reset flags */
 755                         inp6->inp_vflag |= INP_IPV4;
 756                         inp6->inp_vflag &= ~INP_IPV6;
 757                         break;
 758 #endif
 759 #ifdef INET6
 760                 case AF_INET6:
 761                         {
 762                                 struct sockaddr_in6 *sin6_p;
 763
 764                                 sin6_p = (struct sockaddr_in6 *)addr;
 765
 766                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 767                                         inp6->inp_vflag |= INP_IPV4;
 768                                 }
 769 #ifdef INET
 770                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 771                                         struct sockaddr_in sin;
 772
 773                                         in6_sin6_2_sin(&sin, sin6_p);
 774                                         inp6->inp_vflag |= INP_IPV4;
 775                                         inp6->inp_vflag &= ~INP_IPV6;
 776                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 777                                         return (error);
 778                                 }
 779 #endif
 780                                 break;
 781                         }
 782 #endif
 783                 default:
 784                         break;
 785                 }
 786         } else if (addr != NULL) {
 787                 struct sockaddr_in6 *sin6_p;
 788
 789                 /* IPV6_V6ONLY socket */
 790 #ifdef INET
 791                 if (addr->sa_family == AF_INET) {
 792                         /* can't bind v4 addr to v6 only socket! */
 793                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 794                         return (EINVAL);
 795                 }
 796 #endif
 797                 sin6_p = (struct sockaddr_in6 *)addr;
 798
 799                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 800                         /* can't bind v4-mapped addrs either! */
 801                         /* NOTE: we don't support SIIT */
 802                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 803                         return (EINVAL);
 804                 }
 805         }
 806         error = sctp_inpcb_bind(so, addr, NULL, p);
 807         return (error);
 808 }
 809
 810
 811 static void
 812 sctp6_close(struct socket *so)
 813 {
 814         sctp_close(so);
 815 }
 816
 817 /* This could be made common with sctp_detach() since they are identical */
 818
 819 static
 820 int
 821 sctp6_disconnect(struct socket *so)
 822 {
 823         return (sctp_disconnect(so));
 824 }
 825
 826
 827 int
 828 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 829     struct mbuf *control, struct thread *p);
 830
 831
 832 static int
 833 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 834     struct mbuf *control, struct thread *p)
 835 {
 836         struct sctp_inpcb *inp;
 837         struct in6pcb *inp6;
 838
 839 #ifdef INET
 840         struct sockaddr_in6 *sin6;
 841
 842 #endif                          /* INET */
 843         /* No SPL needed since sctp_output does this */
 844
 845         inp = (struct sctp_inpcb *)so->so_pcb;
 846         if (inp == NULL) {
 847                 if (control) {
 848                         SCTP_RELEASE_PKT(control);
 849                         control = NULL;
 850                 }
 851                 SCTP_RELEASE_PKT(m);
 852                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 853                 return (EINVAL);
 854         }
 855         inp6 = (struct in6pcb *)inp;
 856         /*
 857          * For the TCP model we may get a NULL addr, if we are a connected
 858          * socket thats ok.
 859          */
 860         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 861             (addr == NULL)) {
 862                 goto connected_type;
 863         }
 864         if (addr == NULL) {
 865                 SCTP_RELEASE_PKT(m);
 866                 if (control) {
 867                         SCTP_RELEASE_PKT(control);
 868                         control = NULL;
 869                 }
 870                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 871                 return (EDESTADDRREQ);
 872         }
 873 #ifdef INET
 874         sin6 = (struct sockaddr_in6 *)addr;
 875         if (SCTP_IPV6_V6ONLY(inp6)) {
 876                 /*
 877                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 878                  * v4 addr or v4-mapped addr
 879                  */
 880                 if (addr->sa_family == AF_INET) {
 881                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 882                         return (EINVAL);
 883                 }
 884                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 885                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 886                         return (EINVAL);
 887                 }
 888         }
 889         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 890                 if (!MODULE_GLOBAL(ip6_v6only)) {
 891                         struct sockaddr_in sin;
 892
 893                         /* convert v4-mapped into v4 addr and send */
 894                         in6_sin6_2_sin(&sin, sin6);
 895                         return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 896                             control, p));
 897                 } else {
 898                         /* mapped addresses aren't enabled */
 899                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 900                         return (EINVAL);
 901                 }
 902         }
 903 #endif                          /* INET */
 904 connected_type:
 905         /* now what about control */
 906         if (control) {
 907                 if (inp->control) {
 908                         SCTP_PRINTF("huh? control set?\n");
 909                         SCTP_RELEASE_PKT(inp->control);
 910                         inp->control = NULL;
 911                 }
 912                 inp->control = control;
 913         }
 914         /* Place the data */
 915         if (inp->pkt) {
 916                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 917                 inp->pkt_last = m;
 918         } else {
 919                 inp->pkt_last = inp->pkt = m;
 920         }
 921         if (
 922         /* FreeBSD and MacOSX uses a flag passed */
 923             ((flags & PRUS_MORETOCOME) == 0)
 924             ) {
 925                 /*
 926                  * note with the current version this code will only be used
 927                  * by OpenBSD, NetBSD and FreeBSD have methods for
 928                  * re-defining sosend() to use sctp_sosend().  One can
 929                  * optionaly switch back to this code (by changing back the
 930                  * defininitions but this is not advisable.
 931                  */
 932                 int ret;
 933
 934                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 935                 inp->pkt = NULL;
 936                 inp->control = NULL;
 937                 return (ret);
 938         } else {
 939                 return (0);
 940         }
 941 }
 942
 943 static int
 944 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 945 {
 946         uint32_t vrf_id;
 947         int error = 0;
 948         struct sctp_inpcb *inp;
 949         struct in6pcb *inp6;
 950         struct sctp_tcb *stcb;
 951
 952 #ifdef INET
 953         struct sockaddr_in6 *sin6;
 954         struct sockaddr_storage ss;
 955
 956 #endif
 957
 958         inp6 = (struct in6pcb *)so->so_pcb;
 959         inp = (struct sctp_inpcb *)so->so_pcb;
 960         if (inp == NULL) {
 961                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 962                 return (ECONNRESET);    /* I made the same as TCP since we are
 963                                          * not setup? */
 964         }
 965         if (addr == NULL) {
 966                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 967                 return (EINVAL);
 968         }
 969         switch (addr->sa_family) {
 970 #ifdef INET
 971         case AF_INET:
 972                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 973                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 974                         return (EINVAL);
 975                 }
 976                 break;
 977 #endif
 978 #ifdef INET6
 979         case AF_INET6:
 980                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 981                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 982                         return (EINVAL);
 983                 }
 984                 break;
 985 #endif
 986         default:
 987                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 988                 return (EINVAL);
 989         }
 990
 991         vrf_id = inp->def_vrf_id;
 992         SCTP_ASOC_CREATE_LOCK(inp);
 993         SCTP_INP_RLOCK(inp);
 994         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 995             SCTP_PCB_FLAGS_UNBOUND) {
 996                 /* Bind a ephemeral port */
 997                 SCTP_INP_RUNLOCK(inp);
 998                 error = sctp6_bind(so, NULL, p);
 999                 if (error) {
1000                         SCTP_ASOC_CREATE_UNLOCK(inp);
1001
1002                         return (error);
1003                 }
1004                 SCTP_INP_RLOCK(inp);
1005         }
1006         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
1007             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
1008                 /* We are already connected AND the TCP model */
1009                 SCTP_INP_RUNLOCK(inp);
1010                 SCTP_ASOC_CREATE_UNLOCK(inp);
1011                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
1012                 return (EADDRINUSE);
1013         }
1014 #ifdef INET
1015         sin6 = (struct sockaddr_in6 *)addr;
1016         if (SCTP_IPV6_V6ONLY(inp6)) {
1017                 /*
1018                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
1019                  * addr or v4-mapped addr
1020                  */
1021                 if (addr->sa_family == AF_INET) {
1022                         SCTP_INP_RUNLOCK(inp);
1023                         SCTP_ASOC_CREATE_UNLOCK(inp);
1024                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1025                         return (EINVAL);
1026                 }
1027                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1028                         SCTP_INP_RUNLOCK(inp);
1029                         SCTP_ASOC_CREATE_UNLOCK(inp);
1030                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1031                         return (EINVAL);
1032                 }
1033         }
1034         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1035                 if (!MODULE_GLOBAL(ip6_v6only)) {
1036                         /* convert v4-mapped into v4 addr */
1037                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
1038                         addr = (struct sockaddr *)&ss;
1039                 } else {
1040                         /* mapped addresses aren't enabled */
1041                         SCTP_INP_RUNLOCK(inp);
1042                         SCTP_ASOC_CREATE_UNLOCK(inp);
1043                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1044                         return (EINVAL);
1045                 }
1046         }
1047 #endif                          /* INET */
1048         /* Now do we connect? */
1049         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1050                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1051                 if (stcb) {
1052                         SCTP_TCB_UNLOCK(stcb);
1053                 }
1054                 SCTP_INP_RUNLOCK(inp);
1055         } else {
1056                 SCTP_INP_RUNLOCK(inp);
1057                 SCTP_INP_WLOCK(inp);
1058                 SCTP_INP_INCR_REF(inp);
1059                 SCTP_INP_WUNLOCK(inp);
1060                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
1061                 if (stcb == NULL) {
1062                         SCTP_INP_WLOCK(inp);
1063                         SCTP_INP_DECR_REF(inp);
1064                         SCTP_INP_WUNLOCK(inp);
1065                 }
1066         }
1067
1068         if (stcb != NULL) {
1069                 /* Already have or am bring up an association */
1070                 SCTP_ASOC_CREATE_UNLOCK(inp);
1071                 SCTP_TCB_UNLOCK(stcb);
1072                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
1073                 return (EALREADY);
1074         }
1075         /* We are GOOD to go */
1076         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
1077         SCTP_ASOC_CREATE_UNLOCK(inp);
1078         if (stcb == NULL) {
1079                 /* Gak! no memory */
1080                 return (error);
1081         }
1082         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
1083                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1084                 /* Set the connected flag so we can queue data */
1085                 soisconnecting(so);
1086         }
1087         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
1088         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1089
1090         /* initialize authentication parameters for the assoc */
1091         sctp_initialize_auth_params(inp, stcb);
1092
1093         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
1094         SCTP_TCB_UNLOCK(stcb);
1095         return (error);
1096 }
1097
1098 static int
1099 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
1100 {
1101         struct sockaddr_in6 *sin6;
1102         struct sctp_inpcb *inp;
1103         uint32_t vrf_id;
1104         struct sctp_ifa *sctp_ifa;
1105
1106         int error;
1107
1108         /*
1109          * Do the malloc first in case it blocks.
1110          */
1111         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
1112         if (sin6 == NULL)
1113                 return (ENOMEM);
1114         sin6->sin6_family = AF_INET6;
1115         sin6->sin6_len = sizeof(*sin6);
1116
1117         inp = (struct sctp_inpcb *)so->so_pcb;
1118         if (inp == NULL) {
1119                 SCTP_FREE_SONAME(sin6);
1120                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1121                 return (ECONNRESET);
1122         }
1123         SCTP_INP_RLOCK(inp);
1124         sin6->sin6_port = inp->sctp_lport;
1125         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1126                 /* For the bound all case you get back 0 */
1127                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1128                         struct sctp_tcb *stcb;
1129                         struct sockaddr_in6 *sin_a6;
1130                         struct sctp_nets *net;
1131                         int fnd;
1132
1133                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1134                         if (stcb == NULL) {
1135                                 goto notConn6;
1136                         }
1137                         fnd = 0;
1138                         sin_a6 = NULL;
1139                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1140                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1141                                 if (sin_a6 == NULL)
1142                                         /* this will make coverity happy */
1143                                         continue;
1144
1145                                 if (sin_a6->sin6_family == AF_INET6) {
1146                                         fnd = 1;
1147                                         break;
1148                                 }
1149                         }
1150                         if ((!fnd) || (sin_a6 == NULL)) {
1151                                 /* punt */
1152                                 goto notConn6;
1153                         }
1154                         vrf_id = inp->def_vrf_id;
1155                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1156                         if (sctp_ifa) {
1157                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1158                         }
1159                 } else {
1160                         /* For the bound all case you get back 0 */
1161         notConn6:
1162                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1163                 }
1164         } else {
1165                 /* Take the first IPv6 address in the list */
1166                 struct sctp_laddr *laddr;
1167                 int fnd = 0;
1168
1169                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1170                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1171                                 struct sockaddr_in6 *sin_a;
1172
1173                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1174                                 sin6->sin6_addr = sin_a->sin6_addr;
1175                                 fnd = 1;
1176                                 break;
1177                         }
1178                 }
1179                 if (!fnd) {
1180                         SCTP_FREE_SONAME(sin6);
1181                         SCTP_INP_RUNLOCK(inp);
1182                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1183                         return (ENOENT);
1184                 }
1185         }
1186         SCTP_INP_RUNLOCK(inp);
1187         /* Scoping things for v6 */
1188         if ((error = sa6_recoverscope(sin6)) != 0) {
1189                 SCTP_FREE_SONAME(sin6);
1190                 return (error);
1191         }
1192         (*addr) = (struct sockaddr *)sin6;
1193         return (0);
1194 }
1195
1196 static int
1197 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1198 {
1199         struct sockaddr_in6 *sin6;
1200         int fnd;
1201         struct sockaddr_in6 *sin_a6;
1202         struct sctp_inpcb *inp;
1203         struct sctp_tcb *stcb;
1204         struct sctp_nets *net;
1205         int error;
1206
1207         /* Do the malloc first in case it blocks. */
1208         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1209         if (sin6 == NULL)
1210                 return (ENOMEM);
1211         sin6->sin6_family = AF_INET6;
1212         sin6->sin6_len = sizeof(*sin6);
1213
1214         inp = (struct sctp_inpcb *)so->so_pcb;
1215         if ((inp == NULL) ||
1216             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1217                 /* UDP type and listeners will drop out here */
1218                 SCTP_FREE_SONAME(sin6);
1219                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1220                 return (ENOTCONN);
1221         }
1222         SCTP_INP_RLOCK(inp);
1223         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1224         if (stcb) {
1225                 SCTP_TCB_LOCK(stcb);
1226         }
1227         SCTP_INP_RUNLOCK(inp);
1228         if (stcb == NULL) {
1229                 SCTP_FREE_SONAME(sin6);
1230                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1231                 return (ECONNRESET);
1232         }
1233         fnd = 0;
1234         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1235                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1236                 if (sin_a6->sin6_family == AF_INET6) {
1237                         fnd = 1;
1238                         sin6->sin6_port = stcb->rport;
1239                         sin6->sin6_addr = sin_a6->sin6_addr;
1240                         break;
1241                 }
1242         }
1243         SCTP_TCB_UNLOCK(stcb);
1244         if (!fnd) {
1245                 /* No IPv4 address */
1246                 SCTP_FREE_SONAME(sin6);
1247                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1248                 return (ENOENT);
1249         }
1250         if ((error = sa6_recoverscope(sin6)) != 0)
1251                 return (error);
1252         *addr = (struct sockaddr *)sin6;
1253         return (0);
1254 }
1255
1256 static int
1257 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1258 {
1259 #ifdef INET
1260         struct sockaddr *addr;
1261
1262 #endif
1263         struct in6pcb *inp6 = sotoin6pcb(so);
1264         int error;
1265
1266         if (inp6 == NULL) {
1267                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1268                 return (EINVAL);
1269         }
1270         /* allow v6 addresses precedence */
1271         error = sctp6_getaddr(so, nam);
1272 #ifdef INET
1273         if (error) {
1274                 /* try v4 next if v6 failed */
1275                 error = sctp_ingetaddr(so, nam);
1276                 if (error) {
1277                         return (error);
1278                 }
1279                 addr = *nam;
1280                 /* if I'm V6ONLY, convert it to v4-mapped */
1281                 if (SCTP_IPV6_V6ONLY(inp6)) {
1282                         struct sockaddr_in6 sin6;
1283
1284                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1285                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1286                 }
1287         }
1288 #endif
1289         return (error);
1290 }
1291
1292
1293 static int
1294 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1295 {
1296 #ifdef INET
1297         struct sockaddr *addr;
1298
1299 #endif
1300         struct in6pcb *inp6 = sotoin6pcb(so);
1301         int error;
1302
1303         if (inp6 == NULL) {
1304                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1305                 return (EINVAL);
1306         }
1307         /* allow v6 addresses precedence */
1308         error = sctp6_peeraddr(so, nam);
1309 #ifdef INET
1310         if (error) {
1311                 /* try v4 next if v6 failed */
1312                 error = sctp_peeraddr(so, nam);
1313                 if (error) {
1314                         return (error);
1315                 }
1316                 addr = *nam;
1317                 /* if I'm V6ONLY, convert it to v4-mapped */
1318                 if (SCTP_IPV6_V6ONLY(inp6)) {
1319                         struct sockaddr_in6 sin6;
1320
1321                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1322                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1323                 }
1324         }
1325 #endif
1326         return (error);
1327 }
1328
1329 struct pr_usrreqs sctp6_usrreqs = {
1330         .pru_abort = sctp6_abort,
1331         .pru_accept = sctp_accept,
1332         .pru_attach = sctp6_attach,
1333         .pru_bind = sctp6_bind,
1334         .pru_connect = sctp6_connect,
1335         .pru_control = in6_control,
1336         .pru_close = sctp6_close,
1337         .pru_detach = sctp6_close,
1338         .pru_sopoll = sopoll_generic,
1339         .pru_flush = sctp_flush,
1340         .pru_disconnect = sctp6_disconnect,
1341         .pru_listen = sctp_listen,
1342         .pru_peeraddr = sctp6_getpeeraddr,
1343         .pru_send = sctp6_send,
1344         .pru_shutdown = sctp_shutdown,
1345         .pru_sockaddr = sctp6_in6getaddr,
1346         .pru_sosend = sctp_sosend,
1347         .pru_soreceive = sctp_soreceive
1348 };