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         /* protection */
 392         int reason;
 393
 394
 395         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 396             (sh == NULL) || (to == NULL)) {
 397                 if (stcb)
 398                         SCTP_TCB_UNLOCK(stcb);
 399                 return;
 400         }
 401         /* First job is to verify the vtag matches what I would send */
 402         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 403                 SCTP_TCB_UNLOCK(stcb);
 404                 return;
 405         }
 406         if (icmph->icmp6_type != ICMP_UNREACH) {
 407                 /* We only care about unreachable */
 408                 SCTP_TCB_UNLOCK(stcb);
 409                 return;
 410         }
 411         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 412             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 413             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 414             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 415             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 416             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 417             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 418             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 419
 420                 /*
 421                  * Hmm reachablity problems we must examine closely. If its
 422                  * not reachable, we may have lost a network. Or if there is
 423                  * NO protocol at the other end named SCTP. well we consider
 424                  * it a OOTB abort.
 425                  */
 426                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 427                         /* Ok that destination is NOT reachable */
 428                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 429                         net->dest_state &= ~SCTP_ADDR_PF;
 430                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 431                             stcb, SCTP_FAILED_THRESHOLD,
 432                             (void *)net, SCTP_SO_NOT_LOCKED);
 433                 }
 434                 SCTP_TCB_UNLOCK(stcb);
 435         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 436             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 437                 /*
 438                  * Here the peer is either playing tricks on us, including
 439                  * an address that belongs to someone who does not support
 440                  * SCTP OR was a userland implementation that shutdown and
 441                  * now is dead. In either case treat it like a OOTB abort
 442                  * with no TCB
 443                  */
 444                 reason = SCTP_PEER_FAULTY;
 445                 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED);
 446 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 447                 so = SCTP_INP_SO(inp);
 448                 atomic_add_int(&stcb->asoc.refcnt, 1);
 449                 SCTP_TCB_UNLOCK(stcb);
 450                 SCTP_SOCKET_LOCK(so, 1);
 451                 SCTP_TCB_LOCK(stcb);
 452                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 453 #endif
 454                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 455 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 456                 SCTP_SOCKET_UNLOCK(so, 1);
 457                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 458 #endif
 459                 /* no need to unlock here, since the TCB is gone */
 460         } else {
 461                 SCTP_TCB_UNLOCK(stcb);
 462         }
 463 }
 464
 465
 466
 467 void
 468 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 469 {
 470         struct sctphdr sh;
 471         struct ip6ctlparam *ip6cp = NULL;
 472         uint32_t vrf_id;
 473
 474         vrf_id = SCTP_DEFAULT_VRFID;
 475
 476         if (pktdst->sa_family != AF_INET6 ||
 477             pktdst->sa_len != sizeof(struct sockaddr_in6))
 478                 return;
 479
 480         if ((unsigned)cmd >= PRC_NCMDS)
 481                 return;
 482         if (PRC_IS_REDIRECT(cmd)) {
 483                 d = NULL;
 484         } else if (inet6ctlerrmap[cmd] == 0) {
 485                 return;
 486         }
 487         /* if the parameter is from icmp6, decode it. */
 488         if (d != NULL) {
 489                 ip6cp = (struct ip6ctlparam *)d;
 490         } else {
 491                 ip6cp = (struct ip6ctlparam *)NULL;
 492         }
 493
 494         if (ip6cp) {
 495                 /*
 496                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 497                  * valid.
 498                  */
 499                 /* check if we can safely examine src and dst ports */
 500                 struct sctp_inpcb *inp = NULL;
 501                 struct sctp_tcb *stcb = NULL;
 502                 struct sctp_nets *net = NULL;
 503                 struct sockaddr_in6 final;
 504
 505                 if (ip6cp->ip6c_m == NULL)
 506                         return;
 507
 508                 bzero(&sh, sizeof(sh));
 509                 bzero(&final, sizeof(final));
 510                 inp = NULL;
 511                 net = NULL;
 512                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 513                     (caddr_t)&sh);
 514                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 515                 final.sin6_len = sizeof(final);
 516                 final.sin6_family = AF_INET6;
 517                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 518                 final.sin6_port = sh.dest_port;
 519                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
 520                     (struct sockaddr *)&final,
 521                     &inp, &net, 1, vrf_id);
 522                 /* inp's ref-count increased && stcb locked */
 523                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 524                         if (cmd == PRC_MSGSIZE) {
 525                                 sctp6_notify_mbuf(inp,
 526                                     ip6cp->ip6c_icmp6,
 527                                     &sh,
 528                                     stcb,
 529                                     net);
 530                                 /* inp's ref-count reduced && stcb unlocked */
 531                         } else {
 532                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 533                                     (struct sockaddr *)&final,
 534                                     stcb, net);
 535                                 /* inp's ref-count reduced && stcb unlocked */
 536                         }
 537                 } else {
 538                         if (PRC_IS_REDIRECT(cmd) && inp) {
 539                                 in6_rtchange((struct in6pcb *)inp,
 540                                     inet6ctlerrmap[cmd]);
 541                         }
 542                         if (inp) {
 543                                 /* reduce inp's ref-count */
 544                                 SCTP_INP_WLOCK(inp);
 545                                 SCTP_INP_DECR_REF(inp);
 546                                 SCTP_INP_WUNLOCK(inp);
 547                         }
 548                         if (stcb)
 549                                 SCTP_TCB_UNLOCK(stcb);
 550                 }
 551         }
 552 }
 553
 554 /*
 555  * this routine can probably be collasped into the one in sctp_userreq.c
 556  * since they do the same thing and now we lookup with a sockaddr
 557  */
 558 static int
 559 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 560 {
 561         struct xucred xuc;
 562         struct sockaddr_in6 addrs[2];
 563         struct sctp_inpcb *inp;
 564         struct sctp_nets *net;
 565         struct sctp_tcb *stcb;
 566         int error;
 567         uint32_t vrf_id;
 568
 569         vrf_id = SCTP_DEFAULT_VRFID;
 570
 571         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 572         if (error)
 573                 return (error);
 574
 575         if (req->newlen != sizeof(addrs)) {
 576                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 577                 return (EINVAL);
 578         }
 579         if (req->oldlen != sizeof(struct ucred)) {
 580                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 581                 return (EINVAL);
 582         }
 583         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 584         if (error)
 585                 return (error);
 586
 587         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
 588             sin6tosa(&addrs[1]),
 589             &inp, &net, 1, vrf_id);
 590         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 591                 if ((inp != NULL) && (stcb == NULL)) {
 592                         /* reduce ref-count */
 593                         SCTP_INP_WLOCK(inp);
 594                         SCTP_INP_DECR_REF(inp);
 595                         goto cred_can_cont;
 596                 }
 597                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 598                 error = ENOENT;
 599                 goto out;
 600         }
 601         SCTP_TCB_UNLOCK(stcb);
 602         /*
 603          * We use the write lock here, only since in the error leg we need
 604          * it. If we used RLOCK, then we would have to
 605          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 606          * Better to use higher wlock.
 607          */
 608         SCTP_INP_WLOCK(inp);
 609 cred_can_cont:
 610         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 611         if (error) {
 612                 SCTP_INP_WUNLOCK(inp);
 613                 goto out;
 614         }
 615         cru2x(inp->sctp_socket->so_cred, &xuc);
 616         SCTP_INP_WUNLOCK(inp);
 617         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 618 out:
 619         return (error);
 620 }
 621
 622 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 623     0, 0,
 624     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 625
 626
 627 /* This is the same as the sctp_abort() could be made common */
 628 static void
 629 sctp6_abort(struct socket *so)
 630 {
 631         struct sctp_inpcb *inp;
 632         uint32_t flags;
 633
 634         inp = (struct sctp_inpcb *)so->so_pcb;
 635         if (inp == 0) {
 636                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 637                 return;
 638         }
 639 sctp_must_try_again:
 640         flags = inp->sctp_flags;
 641 #ifdef SCTP_LOG_CLOSING
 642         sctp_log_closing(inp, NULL, 17);
 643 #endif
 644         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 645             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 646 #ifdef SCTP_LOG_CLOSING
 647                 sctp_log_closing(inp, NULL, 16);
 648 #endif
 649                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 650                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 651                 SOCK_LOCK(so);
 652                 SCTP_SB_CLEAR(so->so_snd);
 653                 /*
 654                  * same for the rcv ones, they are only here for the
 655                  * accounting/select.
 656                  */
 657                 SCTP_SB_CLEAR(so->so_rcv);
 658                 /* Now null out the reference, we are completely detached. */
 659                 so->so_pcb = NULL;
 660                 SOCK_UNLOCK(so);
 661         } else {
 662                 flags = inp->sctp_flags;
 663                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 664                         goto sctp_must_try_again;
 665                 }
 666         }
 667         return;
 668 }
 669
 670 static int
 671 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 672 {
 673         struct in6pcb *inp6;
 674         int error;
 675         struct sctp_inpcb *inp;
 676         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 677
 678         inp = (struct sctp_inpcb *)so->so_pcb;
 679         if (inp != NULL) {
 680                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 681                 return (EINVAL);
 682         }
 683         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 684                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 685                 if (error)
 686                         return (error);
 687         }
 688         error = sctp_inpcb_alloc(so, vrf_id);
 689         if (error)
 690                 return (error);
 691         inp = (struct sctp_inpcb *)so->so_pcb;
 692         SCTP_INP_WLOCK(inp);
 693         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 694         inp6 = (struct in6pcb *)inp;
 695
 696         inp6->inp_vflag |= INP_IPV6;
 697         inp6->in6p_hops = -1;   /* use kernel default */
 698         inp6->in6p_cksum = -1;  /* just to be sure */
 699 #ifdef INET
 700         /*
 701          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 702          * socket as well, because the socket may be bound to an IPv6
 703          * wildcard address, which may match an IPv4-mapped IPv6 address.
 704          */
 705         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 706 #endif
 707         /*
 708          * Hmm what about the IPSEC stuff that is missing here but in
 709          * sctp_attach()?
 710          */
 711         SCTP_INP_WUNLOCK(inp);
 712         return (0);
 713 }
 714
 715 static int
 716 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 717 {
 718         struct sctp_inpcb *inp;
 719         struct in6pcb *inp6;
 720         int error;
 721
 722         inp = (struct sctp_inpcb *)so->so_pcb;
 723         if (inp == 0) {
 724                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 725                 return (EINVAL);
 726         }
 727         if (addr) {
 728                 switch (addr->sa_family) {
 729 #ifdef INET
 730                 case AF_INET:
 731                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 732                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 733                                 return (EINVAL);
 734                         }
 735                         break;
 736 #endif
 737 #ifdef INET6
 738                 case AF_INET6:
 739                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 740                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 741                                 return (EINVAL);
 742                         }
 743                         break;
 744 #endif
 745                 default:
 746                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 747                         return (EINVAL);
 748                 }
 749         }
 750         inp6 = (struct in6pcb *)inp;
 751         inp6->inp_vflag &= ~INP_IPV4;
 752         inp6->inp_vflag |= INP_IPV6;
 753         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 754                 switch (addr->sa_family) {
 755 #ifdef INET
 756                 case AF_INET:
 757                         /* binding v4 addr to v6 socket, so reset flags */
 758                         inp6->inp_vflag |= INP_IPV4;
 759                         inp6->inp_vflag &= ~INP_IPV6;
 760                         break;
 761 #endif
 762 #ifdef INET6
 763                 case AF_INET6:
 764                         {
 765                                 struct sockaddr_in6 *sin6_p;
 766
 767                                 sin6_p = (struct sockaddr_in6 *)addr;
 768
 769                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 770                                         inp6->inp_vflag |= INP_IPV4;
 771                                 }
 772 #ifdef INET
 773                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 774                                         struct sockaddr_in sin;
 775
 776                                         in6_sin6_2_sin(&sin, sin6_p);
 777                                         inp6->inp_vflag |= INP_IPV4;
 778                                         inp6->inp_vflag &= ~INP_IPV6;
 779                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 780                                         return (error);
 781                                 }
 782 #endif
 783                                 break;
 784                         }
 785 #endif
 786                 default:
 787                         break;
 788                 }
 789         } else if (addr != NULL) {
 790                 struct sockaddr_in6 *sin6_p;
 791
 792                 /* IPV6_V6ONLY socket */
 793 #ifdef INET
 794                 if (addr->sa_family == AF_INET) {
 795                         /* can't bind v4 addr to v6 only socket! */
 796                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 797                         return (EINVAL);
 798                 }
 799 #endif
 800                 sin6_p = (struct sockaddr_in6 *)addr;
 801
 802                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 803                         /* can't bind v4-mapped addrs either! */
 804                         /* NOTE: we don't support SIIT */
 805                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 806                         return (EINVAL);
 807                 }
 808         }
 809         error = sctp_inpcb_bind(so, addr, NULL, p);
 810         return (error);
 811 }
 812
 813
 814 static void
 815 sctp6_close(struct socket *so)
 816 {
 817         sctp_close(so);
 818 }
 819
 820 /* This could be made common with sctp_detach() since they are identical */
 821
 822 static
 823 int
 824 sctp6_disconnect(struct socket *so)
 825 {
 826         return (sctp_disconnect(so));
 827 }
 828
 829
 830 int
 831 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 832     struct mbuf *control, struct thread *p);
 833
 834
 835 static int
 836 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 837     struct mbuf *control, struct thread *p)
 838 {
 839         struct sctp_inpcb *inp;
 840         struct in6pcb *inp6;
 841
 842 #ifdef INET
 843         struct sockaddr_in6 *sin6;
 844
 845 #endif                          /* INET */
 846         /* No SPL needed since sctp_output does this */
 847
 848         inp = (struct sctp_inpcb *)so->so_pcb;
 849         if (inp == NULL) {
 850                 if (control) {
 851                         SCTP_RELEASE_PKT(control);
 852                         control = NULL;
 853                 }
 854                 SCTP_RELEASE_PKT(m);
 855                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 856                 return (EINVAL);
 857         }
 858         inp6 = (struct in6pcb *)inp;
 859         /*
 860          * For the TCP model we may get a NULL addr, if we are a connected
 861          * socket thats ok.
 862          */
 863         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 864             (addr == NULL)) {
 865                 goto connected_type;
 866         }
 867         if (addr == NULL) {
 868                 SCTP_RELEASE_PKT(m);
 869                 if (control) {
 870                         SCTP_RELEASE_PKT(control);
 871                         control = NULL;
 872                 }
 873                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 874                 return (EDESTADDRREQ);
 875         }
 876 #ifdef INET
 877         sin6 = (struct sockaddr_in6 *)addr;
 878         if (SCTP_IPV6_V6ONLY(inp6)) {
 879                 /*
 880                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 881                  * v4 addr or v4-mapped addr
 882                  */
 883                 if (addr->sa_family == AF_INET) {
 884                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 885                         return (EINVAL);
 886                 }
 887                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 888                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 889                         return (EINVAL);
 890                 }
 891         }
 892         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 893                 if (!MODULE_GLOBAL(ip6_v6only)) {
 894                         struct sockaddr_in sin;
 895
 896                         /* convert v4-mapped into v4 addr and send */
 897                         in6_sin6_2_sin(&sin, sin6);
 898                         return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 899                             control, p));
 900                 } else {
 901                         /* mapped addresses aren't enabled */
 902                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 903                         return (EINVAL);
 904                 }
 905         }
 906 #endif                          /* INET */
 907 connected_type:
 908         /* now what about control */
 909         if (control) {
 910                 if (inp->control) {
 911                         SCTP_PRINTF("huh? control set?\n");
 912                         SCTP_RELEASE_PKT(inp->control);
 913                         inp->control = NULL;
 914                 }
 915                 inp->control = control;
 916         }
 917         /* Place the data */
 918         if (inp->pkt) {
 919                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 920                 inp->pkt_last = m;
 921         } else {
 922                 inp->pkt_last = inp->pkt = m;
 923         }
 924         if (
 925         /* FreeBSD and MacOSX uses a flag passed */
 926             ((flags & PRUS_MORETOCOME) == 0)
 927             ) {
 928                 /*
 929                  * note with the current version this code will only be used
 930                  * by OpenBSD, NetBSD and FreeBSD have methods for
 931                  * re-defining sosend() to use sctp_sosend().  One can
 932                  * optionaly switch back to this code (by changing back the
 933                  * defininitions but this is not advisable.
 934                  */
 935                 int ret;
 936
 937                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 938                 inp->pkt = NULL;
 939                 inp->control = NULL;
 940                 return (ret);
 941         } else {
 942                 return (0);
 943         }
 944 }
 945
 946 static int
 947 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 948 {
 949         uint32_t vrf_id;
 950         int error = 0;
 951         struct sctp_inpcb *inp;
 952         struct in6pcb *inp6;
 953         struct sctp_tcb *stcb;
 954
 955 #ifdef INET
 956         struct sockaddr_in6 *sin6;
 957         struct sockaddr_storage ss;
 958
 959 #endif
 960
 961         inp6 = (struct in6pcb *)so->so_pcb;
 962         inp = (struct sctp_inpcb *)so->so_pcb;
 963         if (inp == 0) {
 964                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 965                 return (ECONNRESET);    /* I made the same as TCP since we are
 966                                          * not setup? */
 967         }
 968         if (addr == NULL) {
 969                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 970                 return (EINVAL);
 971         }
 972         switch (addr->sa_family) {
 973 #ifdef INET
 974         case AF_INET:
 975                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 976                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 977                         return (EINVAL);
 978                 }
 979                 break;
 980 #endif
 981 #ifdef INET6
 982         case AF_INET6:
 983                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 984                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 985                         return (EINVAL);
 986                 }
 987                 break;
 988 #endif
 989         default:
 990                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 991                 return (EINVAL);
 992         }
 993
 994         vrf_id = inp->def_vrf_id;
 995         SCTP_ASOC_CREATE_LOCK(inp);
 996         SCTP_INP_RLOCK(inp);
 997         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 998             SCTP_PCB_FLAGS_UNBOUND) {
 999                 /* Bind a ephemeral port */
1000                 SCTP_INP_RUNLOCK(inp);
1001                 error = sctp6_bind(so, NULL, p);
1002                 if (error) {
1003                         SCTP_ASOC_CREATE_UNLOCK(inp);
1004
1005                         return (error);
1006                 }
1007                 SCTP_INP_RLOCK(inp);
1008         }
1009         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
1010             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
1011                 /* We are already connected AND the TCP model */
1012                 SCTP_INP_RUNLOCK(inp);
1013                 SCTP_ASOC_CREATE_UNLOCK(inp);
1014                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
1015                 return (EADDRINUSE);
1016         }
1017 #ifdef INET
1018         sin6 = (struct sockaddr_in6 *)addr;
1019         if (SCTP_IPV6_V6ONLY(inp6)) {
1020                 /*
1021                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
1022                  * addr or v4-mapped addr
1023                  */
1024                 if (addr->sa_family == AF_INET) {
1025                         SCTP_INP_RUNLOCK(inp);
1026                         SCTP_ASOC_CREATE_UNLOCK(inp);
1027                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1028                         return (EINVAL);
1029                 }
1030                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1031                         SCTP_INP_RUNLOCK(inp);
1032                         SCTP_ASOC_CREATE_UNLOCK(inp);
1033                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1034                         return (EINVAL);
1035                 }
1036         }
1037         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1038                 if (!MODULE_GLOBAL(ip6_v6only)) {
1039                         /* convert v4-mapped into v4 addr */
1040                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
1041                         addr = (struct sockaddr *)&ss;
1042                 } else {
1043                         /* mapped addresses aren't enabled */
1044                         SCTP_INP_RUNLOCK(inp);
1045                         SCTP_ASOC_CREATE_UNLOCK(inp);
1046                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1047                         return (EINVAL);
1048                 }
1049         }
1050 #endif                          /* INET */
1051         /* Now do we connect? */
1052         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1053                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1054                 if (stcb) {
1055                         SCTP_TCB_UNLOCK(stcb);
1056                 }
1057                 SCTP_INP_RUNLOCK(inp);
1058         } else {
1059                 SCTP_INP_RUNLOCK(inp);
1060                 SCTP_INP_WLOCK(inp);
1061                 SCTP_INP_INCR_REF(inp);
1062                 SCTP_INP_WUNLOCK(inp);
1063                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
1064                 if (stcb == NULL) {
1065                         SCTP_INP_WLOCK(inp);
1066                         SCTP_INP_DECR_REF(inp);
1067                         SCTP_INP_WUNLOCK(inp);
1068                 }
1069         }
1070
1071         if (stcb != NULL) {
1072                 /* Already have or am bring up an association */
1073                 SCTP_ASOC_CREATE_UNLOCK(inp);
1074                 SCTP_TCB_UNLOCK(stcb);
1075                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
1076                 return (EALREADY);
1077         }
1078         /* We are GOOD to go */
1079         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
1080         SCTP_ASOC_CREATE_UNLOCK(inp);
1081         if (stcb == NULL) {
1082                 /* Gak! no memory */
1083                 return (error);
1084         }
1085         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
1086                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1087                 /* Set the connected flag so we can queue data */
1088                 soisconnecting(so);
1089         }
1090         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
1091         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1092
1093         /* initialize authentication parameters for the assoc */
1094         sctp_initialize_auth_params(inp, stcb);
1095
1096         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
1097         SCTP_TCB_UNLOCK(stcb);
1098         return (error);
1099 }
1100
1101 static int
1102 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
1103 {
1104         struct sockaddr_in6 *sin6;
1105         struct sctp_inpcb *inp;
1106         uint32_t vrf_id;
1107         struct sctp_ifa *sctp_ifa;
1108
1109         int error;
1110
1111         /*
1112          * Do the malloc first in case it blocks.
1113          */
1114         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
1115         if (sin6 == NULL)
1116                 return (ENOMEM);
1117         sin6->sin6_family = AF_INET6;
1118         sin6->sin6_len = sizeof(*sin6);
1119
1120         inp = (struct sctp_inpcb *)so->so_pcb;
1121         if (inp == NULL) {
1122                 SCTP_FREE_SONAME(sin6);
1123                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1124                 return (ECONNRESET);
1125         }
1126         SCTP_INP_RLOCK(inp);
1127         sin6->sin6_port = inp->sctp_lport;
1128         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1129                 /* For the bound all case you get back 0 */
1130                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1131                         struct sctp_tcb *stcb;
1132                         struct sockaddr_in6 *sin_a6;
1133                         struct sctp_nets *net;
1134                         int fnd;
1135
1136                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1137                         if (stcb == NULL) {
1138                                 goto notConn6;
1139                         }
1140                         fnd = 0;
1141                         sin_a6 = NULL;
1142                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1143                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1144                                 if (sin_a6 == NULL)
1145                                         /* this will make coverity happy */
1146                                         continue;
1147
1148                                 if (sin_a6->sin6_family == AF_INET6) {
1149                                         fnd = 1;
1150                                         break;
1151                                 }
1152                         }
1153                         if ((!fnd) || (sin_a6 == NULL)) {
1154                                 /* punt */
1155                                 goto notConn6;
1156                         }
1157                         vrf_id = inp->def_vrf_id;
1158                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1159                         if (sctp_ifa) {
1160                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1161                         }
1162                 } else {
1163                         /* For the bound all case you get back 0 */
1164         notConn6:
1165                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1166                 }
1167         } else {
1168                 /* Take the first IPv6 address in the list */
1169                 struct sctp_laddr *laddr;
1170                 int fnd = 0;
1171
1172                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1173                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1174                                 struct sockaddr_in6 *sin_a;
1175
1176                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1177                                 sin6->sin6_addr = sin_a->sin6_addr;
1178                                 fnd = 1;
1179                                 break;
1180                         }
1181                 }
1182                 if (!fnd) {
1183                         SCTP_FREE_SONAME(sin6);
1184                         SCTP_INP_RUNLOCK(inp);
1185                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1186                         return (ENOENT);
1187                 }
1188         }
1189         SCTP_INP_RUNLOCK(inp);
1190         /* Scoping things for v6 */
1191         if ((error = sa6_recoverscope(sin6)) != 0) {
1192                 SCTP_FREE_SONAME(sin6);
1193                 return (error);
1194         }
1195         (*addr) = (struct sockaddr *)sin6;
1196         return (0);
1197 }
1198
1199 static int
1200 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1201 {
1202         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr;
1203         int fnd;
1204         struct sockaddr_in6 *sin_a6;
1205         struct sctp_inpcb *inp;
1206         struct sctp_tcb *stcb;
1207         struct sctp_nets *net;
1208         int error;
1209
1210         /* Do the malloc first in case it blocks. */
1211         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1212         if (sin6 == NULL)
1213                 return (ENOMEM);
1214         sin6->sin6_family = AF_INET6;
1215         sin6->sin6_len = sizeof(*sin6);
1216
1217         inp = (struct sctp_inpcb *)so->so_pcb;
1218         if ((inp == NULL) ||
1219             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1220                 /* UDP type and listeners will drop out here */
1221                 SCTP_FREE_SONAME(sin6);
1222                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1223                 return (ENOTCONN);
1224         }
1225         SCTP_INP_RLOCK(inp);
1226         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1227         if (stcb) {
1228                 SCTP_TCB_LOCK(stcb);
1229         }
1230         SCTP_INP_RUNLOCK(inp);
1231         if (stcb == NULL) {
1232                 SCTP_FREE_SONAME(sin6);
1233                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1234                 return (ECONNRESET);
1235         }
1236         fnd = 0;
1237         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1238                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1239                 if (sin_a6->sin6_family == AF_INET6) {
1240                         fnd = 1;
1241                         sin6->sin6_port = stcb->rport;
1242                         sin6->sin6_addr = sin_a6->sin6_addr;
1243                         break;
1244                 }
1245         }
1246         SCTP_TCB_UNLOCK(stcb);
1247         if (!fnd) {
1248                 /* No IPv4 address */
1249                 SCTP_FREE_SONAME(sin6);
1250                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1251                 return (ENOENT);
1252         }
1253         if ((error = sa6_recoverscope(sin6)) != 0)
1254                 return (error);
1255         *addr = (struct sockaddr *)sin6;
1256         return (0);
1257 }
1258
1259 static int
1260 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1261 {
1262 #ifdef INET
1263         struct sockaddr *addr;
1264
1265 #endif
1266         struct in6pcb *inp6 = sotoin6pcb(so);
1267         int error;
1268
1269         if (inp6 == NULL) {
1270                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1271                 return (EINVAL);
1272         }
1273         /* allow v6 addresses precedence */
1274         error = sctp6_getaddr(so, nam);
1275 #ifdef INET
1276         if (error) {
1277                 /* try v4 next if v6 failed */
1278                 error = sctp_ingetaddr(so, nam);
1279                 if (error) {
1280                         return (error);
1281                 }
1282                 addr = *nam;
1283                 /* if I'm V6ONLY, convert it to v4-mapped */
1284                 if (SCTP_IPV6_V6ONLY(inp6)) {
1285                         struct sockaddr_in6 sin6;
1286
1287                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1288                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1289                 }
1290         }
1291 #endif
1292         return (error);
1293 }
1294
1295
1296 static int
1297 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1298 {
1299 #ifdef INET
1300         struct sockaddr *addr;
1301
1302 #endif
1303         struct in6pcb *inp6 = sotoin6pcb(so);
1304         int error;
1305
1306         if (inp6 == NULL) {
1307                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1308                 return (EINVAL);
1309         }
1310         /* allow v6 addresses precedence */
1311         error = sctp6_peeraddr(so, nam);
1312 #ifdef INET
1313         if (error) {
1314                 /* try v4 next if v6 failed */
1315                 error = sctp_peeraddr(so, nam);
1316                 if (error) {
1317                         return (error);
1318                 }
1319                 addr = *nam;
1320                 /* if I'm V6ONLY, convert it to v4-mapped */
1321                 if (SCTP_IPV6_V6ONLY(inp6)) {
1322                         struct sockaddr_in6 sin6;
1323
1324                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1325                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1326                 }
1327         }
1328 #endif
1329         return (error);
1330 }
1331
1332 struct pr_usrreqs sctp6_usrreqs = {
1333         .pru_abort = sctp6_abort,
1334         .pru_accept = sctp_accept,
1335         .pru_attach = sctp6_attach,
1336         .pru_bind = sctp6_bind,
1337         .pru_connect = sctp6_connect,
1338         .pru_control = in6_control,
1339         .pru_close = sctp6_close,
1340         .pru_detach = sctp6_close,
1341         .pru_sopoll = sopoll_generic,
1342         .pru_flush = sctp_flush,
1343         .pru_disconnect = sctp6_disconnect,
1344         .pru_listen = sctp_listen,
1345         .pru_peeraddr = sctp6_getpeeraddr,
1346         .pru_send = sctp6_send,
1347         .pru_shutdown = sctp_shutdown,
1348         .pru_sockaddr = sctp6_in6getaddr,
1349         .pru_sosend = sctp_sosend,
1350         .pru_soreceive = sctp_soreceive
1351 };