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