sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_pcb.h>
  39 #include <netinet/sctp_header.h>
  40 #include <netinet/sctp_var.h>
  41 #ifdef INET6
  42 #include <netinet6/sctp6_var.h>
  43 #endif
  44 #include <netinet/sctp_sysctl.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctp_asconf.h>
  48 #include <netinet/sctputil.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_auth.h>
  52 #include <netinet/sctp_input.h>
  53 #include <netinet/sctp_output.h>
  54 #include <netinet/sctp_bsd_addr.h>
  55 #include <netinet/sctp_crc32.h>
  56 #include <netinet/udp.h>
  57
  58 #ifdef IPSEC
  59 #include <netipsec/ipsec.h>
  60 #ifdef INET6
  61 #include <netipsec/ipsec6.h>
  62 #endif                          /* INET6 */
  63 #endif                          /* IPSEC */
  64
  65 extern struct protosw inetsw[];
  66
  67 int
  68 sctp6_input(struct mbuf **i_pak, int *offp, int proto)
  69 {
  70         struct mbuf *m;
  71         struct ip6_hdr *ip6;
  72         struct sctphdr *sh;
  73         struct sctp_inpcb *in6p = NULL;
  74         struct sctp_nets *net;
  75         int refcount_up = 0;
  76         uint32_t vrf_id = 0;
  77
  78 #ifdef IPSEC
  79         struct inpcb *in6p_ip;
  80
  81 #endif
  82         struct sctp_chunkhdr *ch;
  83         int length, offset, iphlen;
  84         uint8_t ecn_bits;
  85         struct sctp_tcb *stcb = NULL;
  86         int pkt_len = 0;
  87         uint32_t mflowid;
  88         uint8_t use_mflowid;
  89
  90 #if !defined(SCTP_WITH_NO_CSUM)
  91         uint32_t check, calc_check;
  92
  93 #endif
  94         int off = *offp;
  95         uint16_t port = 0;
  96
  97         /* get the VRF and table id's */
  98         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  99                 SCTP_RELEASE_PKT(*i_pak);
 100                 return (-1);
 101         }
 102         m = SCTP_HEADER_TO_CHAIN(*i_pak);
 103         pkt_len = SCTP_HEADER_LEN((*i_pak));
 104
 105 #ifdef  SCTP_PACKET_LOGGING
 106         sctp_packet_log(m, pkt_len);
 107 #endif
 108         if (m->m_flags & M_FLOWID) {
 109                 mflowid = m->m_pkthdr.flowid;
 110                 use_mflowid = 1;
 111         } else {
 112                 mflowid = 0;
 113                 use_mflowid = 0;
 114         }
 115         ip6 = mtod(m, struct ip6_hdr *);
 116         /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
 117         IP6_EXTHDR_GET(sh, struct sctphdr *, m, off,
 118             (int)(sizeof(*sh) + sizeof(*ch)));
 119         if (sh == NULL) {
 120                 SCTP_STAT_INCR(sctps_hdrops);
 121                 return (IPPROTO_DONE);
 122         }
 123         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 124         iphlen = off;
 125         offset = iphlen + sizeof(*sh) + sizeof(*ch);
 126         SCTPDBG(SCTP_DEBUG_INPUT1,
 127             "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen);
 128
 129
 130 #if defined(NFAITH) && NFAITH > 0
 131
 132         if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
 133                 /* XXX send icmp6 host/port unreach? */
 134                 goto bad;
 135         }
 136 #endif                          /* NFAITH defined and > 0 */
 137         SCTP_STAT_INCR(sctps_recvpackets);
 138         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 139         SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n",
 140             iphlen, pkt_len);
 141         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 142                 /* No multi-cast support in SCTP */
 143                 goto bad;
 144         }
 145         /* destination port of 0 is illegal, based on RFC2960. */
 146         if (sh->dest_port == 0)
 147                 goto bad;
 148
 149         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 150             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
 151             m->m_pkthdr.len,
 152             if_name(m->m_pkthdr.rcvif),
 153             m->m_pkthdr.csum_flags);
 154 #if defined(SCTP_WITH_NO_CSUM)
 155         SCTP_STAT_INCR(sctps_recvnocrc);
 156 #else
 157         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 158                 SCTP_STAT_INCR(sctps_recvhwcrc);
 159                 goto sctp_skip_csum;
 160         }
 161         check = sh->checksum;   /* save incoming checksum */
 162         sh->checksum = 0;       /* prepare for calc */
 163         calc_check = sctp_calculate_cksum(m, iphlen);
 164         SCTP_STAT_INCR(sctps_recvswcrc);
 165         if (calc_check != check) {
 166                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p phlen:%d\n",
 167                     calc_check, check, m, iphlen);
 168                 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
 169                     sh, ch, &in6p, &net, vrf_id);
 170                 if ((net) && (port)) {
 171                         if (net->port == 0) {
 172                                 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
 173                         }
 174                         net->port = port;
 175                 }
 176                 if ((net != NULL) && (use_mflowid != 0)) {
 177                         net->flowid = mflowid;
 178 #ifdef INVARIANTS
 179                         net->flowidset = 1;
 180 #endif
 181                 }
 182                 /* in6p's ref-count increased && stcb locked */
 183                 if ((in6p) && (stcb)) {
 184                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
 185                         sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 186                 } else if ((in6p != NULL) && (stcb == NULL)) {
 187                         refcount_up = 1;
 188                 }
 189                 SCTP_STAT_INCR(sctps_badsum);
 190                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 191                 goto bad;
 192         }
 193         sh->checksum = calc_check;
 194
 195 sctp_skip_csum:
 196 #endif
 197         net = NULL;
 198         /*
 199          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
 200          * IP/SCTP/first chunk header...
 201          */
 202         stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
 203             sh, ch, &in6p, &net, vrf_id);
 204         if ((net) && (port)) {
 205                 if (net->port == 0) {
 206                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
 207                 }
 208                 net->port = port;
 209         }
 210         if ((net != NULL) && (use_mflowid != 0)) {
 211                 net->flowid = mflowid;
 212 #ifdef INVARIANTS
 213                 net->flowidset = 1;
 214 #endif
 215         }
 216         /* in6p's ref-count increased */
 217         if (in6p == NULL) {
 218                 struct sctp_init_chunk *init_chk, chunk_buf;
 219
 220                 SCTP_STAT_INCR(sctps_noport);
 221                 if (ch->chunk_type == SCTP_INITIATION) {
 222                         /*
 223                          * we do a trick here to get the INIT tag, dig in
 224                          * and get the tag from the INIT and put it in the
 225                          * common header.
 226                          */
 227                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
 228                             iphlen + sizeof(*sh), sizeof(*init_chk),
 229                             (uint8_t *) & chunk_buf);
 230                         if (init_chk)
 231                                 sh->v_tag = init_chk->init.initiate_tag;
 232                         else
 233                                 sh->v_tag = 0;
 234                 }
 235                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 236                         sctp_send_shutdown_complete2(m, sh,
 237                             use_mflowid, mflowid,
 238                             vrf_id, port);
 239                         goto bad;
 240                 }
 241                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 242                         goto bad;
 243                 }
 244                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
 245                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
 246                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
 247                             (ch->chunk_type != SCTP_INIT))) {
 248                                 sctp_send_abort(m, iphlen, sh, 0, NULL,
 249                                     use_mflowid, mflowid,
 250                                     vrf_id, port);
 251                         }
 252                 }
 253                 goto bad;
 254         } else if (stcb == NULL) {
 255                 refcount_up = 1;
 256         }
 257 #ifdef IPSEC
 258         /*
 259          * Check AH/ESP integrity.
 260          */
 261         in6p_ip = (struct inpcb *)in6p;
 262         if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) {
 263 /* XXX */
 264                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
 265                 goto bad;
 266         }
 267 #endif                          /* IPSEC */
 268
 269         /*
 270          * CONTROL chunk processing
 271          */
 272         offset -= sizeof(*ch);
 273         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 274
 275         /* Length now holds the total packet length payload + iphlen */
 276         length = ntohs(ip6->ip6_plen) + iphlen;
 277
 278         /* sa_ignore NO_NULL_CHK */
 279         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
 280             in6p, stcb, net, ecn_bits,
 281             use_mflowid, mflowid,
 282             vrf_id, port);
 283         /* inp's ref-count reduced && stcb unlocked */
 284         /* XXX this stuff below gets moved to appropriate parts later... */
 285         if (m)
 286                 sctp_m_freem(m);
 287         if ((in6p) && refcount_up) {
 288                 /* reduce ref-count */
 289                 SCTP_INP_WLOCK(in6p);
 290                 SCTP_INP_DECR_REF(in6p);
 291                 SCTP_INP_WUNLOCK(in6p);
 292         }
 293         return (IPPROTO_DONE);
 294
 295 bad:
 296         if (stcb) {
 297                 SCTP_TCB_UNLOCK(stcb);
 298         }
 299         if ((in6p) && refcount_up) {
 300                 /* reduce ref-count */
 301                 SCTP_INP_WLOCK(in6p);
 302                 SCTP_INP_DECR_REF(in6p);
 303                 SCTP_INP_WUNLOCK(in6p);
 304         }
 305         if (m)
 306                 sctp_m_freem(m);
 307         return (IPPROTO_DONE);
 308 }
 309
 310
 311 static void
 312 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 313     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 314 {
 315         uint32_t nxtsz;
 316
 317         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 318             (icmp6 == NULL) || (sh == NULL)) {
 319                 goto out;
 320         }
 321         /* First do we even look at it? */
 322         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 323                 goto out;
 324
 325         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 326                 /* not PACKET TO BIG */
 327                 goto out;
 328         }
 329         /*
 330          * ok we need to look closely. We could even get smarter and look at
 331          * anyone that we sent to in case we get a different ICMP that tells
 332          * us there is no way to reach a host, but for this impl, all we
 333          * care about is MTU discovery.
 334          */
 335         nxtsz = ntohl(icmp6->icmp6_mtu);
 336         /* Stop any PMTU timer */
 337         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 338
 339         /* Adjust destination size limit */
 340         if (net->mtu > nxtsz) {
 341                 net->mtu = nxtsz;
 342                 if (net->port) {
 343                         net->mtu -= sizeof(struct udphdr);
 344                 }
 345         }
 346         /* now what about the ep? */
 347         if (stcb->asoc.smallest_mtu > nxtsz) {
 348                 struct sctp_tmit_chunk *chk;
 349
 350                 /* Adjust that too */
 351                 stcb->asoc.smallest_mtu = nxtsz;
 352                 /* now off to subtract IP_DF flag if needed */
 353
 354                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 355                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 356                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 357                         }
 358                 }
 359                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 360                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 361                                 /*
 362                                  * For this guy we also mark for immediate
 363                                  * resend since we sent to big of chunk
 364                                  */
 365                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 366                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 367                                         stcb->asoc.sent_queue_retran_cnt++;
 368                                 chk->sent = SCTP_DATAGRAM_RESEND;
 369                                 chk->rec.data.doing_fast_retransmit = 0;
 370
 371                                 chk->sent = SCTP_DATAGRAM_RESEND;
 372                                 /* Clear any time so NO RTT is being done */
 373                                 chk->sent_rcv_time.tv_sec = 0;
 374                                 chk->sent_rcv_time.tv_usec = 0;
 375                                 stcb->asoc.total_flight -= chk->send_size;
 376                                 net->flight_size -= chk->send_size;
 377                         }
 378                 }
 379         }
 380         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 381 out:
 382         if (stcb) {
 383                 SCTP_TCB_UNLOCK(stcb);
 384         }
 385 }
 386
 387
 388 void
 389 sctp6_notify(struct sctp_inpcb *inp,
 390     struct icmp6_hdr *icmph,
 391     struct sctphdr *sh,
 392     struct sockaddr *to,
 393     struct sctp_tcb *stcb,
 394     struct sctp_nets *net)
 395 {
 396 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 397         struct socket *so;
 398
 399 #endif
 400
 401         /* protection */
 402         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 403             (sh == NULL) || (to == NULL)) {
 404                 if (stcb)
 405                         SCTP_TCB_UNLOCK(stcb);
 406                 return;
 407         }
 408         /* First job is to verify the vtag matches what I would send */
 409         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 410                 SCTP_TCB_UNLOCK(stcb);
 411                 return;
 412         }
 413         if (icmph->icmp6_type != ICMP_UNREACH) {
 414                 /* We only care about unreachable */
 415                 SCTP_TCB_UNLOCK(stcb);
 416                 return;
 417         }
 418         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 419             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 420             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 421             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 422             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 423             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 424             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 425             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 426
 427                 /*
 428                  * Hmm reachablity problems we must examine closely. If its
 429                  * not reachable, we may have lost a network. Or if there is
 430                  * NO protocol at the other end named SCTP. well we consider
 431                  * it a OOTB abort.
 432                  */
 433                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 434                         /* Ok that destination is NOT reachable */
 435                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 436                         net->dest_state &= ~SCTP_ADDR_PF;
 437                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 438                             stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 439                 }
 440                 SCTP_TCB_UNLOCK(stcb);
 441         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 442             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 443                 /*
 444                  * Here the peer is either playing tricks on us, including
 445                  * an address that belongs to someone who does not support
 446                  * SCTP OR was a userland implementation that shutdown and
 447                  * now is dead. In either case treat it like a OOTB abort
 448                  * with no TCB
 449                  */
 450                 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 451 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 452                 so = SCTP_INP_SO(inp);
 453                 atomic_add_int(&stcb->asoc.refcnt, 1);
 454                 SCTP_TCB_UNLOCK(stcb);
 455                 SCTP_SOCKET_LOCK(so, 1);
 456                 SCTP_TCB_LOCK(stcb);
 457                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 458 #endif
 459                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 460 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 461                 SCTP_SOCKET_UNLOCK(so, 1);
 462                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 463 #endif
 464                 /* no need to unlock here, since the TCB is gone */
 465         } else {
 466                 SCTP_TCB_UNLOCK(stcb);
 467         }
 468 }
 469
 470
 471
 472 void
 473 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 474 {
 475         struct sctphdr sh;
 476         struct ip6ctlparam *ip6cp = NULL;
 477         uint32_t vrf_id;
 478
 479         vrf_id = SCTP_DEFAULT_VRFID;
 480
 481         if (pktdst->sa_family != AF_INET6 ||
 482             pktdst->sa_len != sizeof(struct sockaddr_in6))
 483                 return;
 484
 485         if ((unsigned)cmd >= PRC_NCMDS)
 486                 return;
 487         if (PRC_IS_REDIRECT(cmd)) {
 488                 d = NULL;
 489         } else if (inet6ctlerrmap[cmd] == 0) {
 490                 return;
 491         }
 492         /* if the parameter is from icmp6, decode it. */
 493         if (d != NULL) {
 494                 ip6cp = (struct ip6ctlparam *)d;
 495         } else {
 496                 ip6cp = (struct ip6ctlparam *)NULL;
 497         }
 498
 499         if (ip6cp) {
 500                 /*
 501                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 502                  * valid.
 503                  */
 504                 /* check if we can safely examine src and dst ports */
 505                 struct sctp_inpcb *inp = NULL;
 506                 struct sctp_tcb *stcb = NULL;
 507                 struct sctp_nets *net = NULL;
 508                 struct sockaddr_in6 final;
 509
 510                 if (ip6cp->ip6c_m == NULL)
 511                         return;
 512
 513                 bzero(&sh, sizeof(sh));
 514                 bzero(&final, sizeof(final));
 515                 inp = NULL;
 516                 net = NULL;
 517                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 518                     (caddr_t)&sh);
 519                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 520                 final.sin6_len = sizeof(final);
 521                 final.sin6_family = AF_INET6;
 522                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 523                 final.sin6_port = sh.dest_port;
 524                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
 525                     (struct sockaddr *)&final,
 526                     &inp, &net, 1, vrf_id);
 527                 /* inp's ref-count increased && stcb locked */
 528                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 529                         if (cmd == PRC_MSGSIZE) {
 530                                 sctp6_notify_mbuf(inp,
 531                                     ip6cp->ip6c_icmp6,
 532                                     &sh,
 533                                     stcb,
 534                                     net);
 535                                 /* inp's ref-count reduced && stcb unlocked */
 536                         } else {
 537                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 538                                     (struct sockaddr *)&final,
 539                                     stcb, net);
 540                                 /* inp's ref-count reduced && stcb unlocked */
 541                         }
 542                 } else {
 543                         if (PRC_IS_REDIRECT(cmd) && inp) {
 544                                 in6_rtchange((struct in6pcb *)inp,
 545                                     inet6ctlerrmap[cmd]);
 546                         }
 547                         if (inp) {
 548                                 /* reduce inp's ref-count */
 549                                 SCTP_INP_WLOCK(inp);
 550                                 SCTP_INP_DECR_REF(inp);
 551                                 SCTP_INP_WUNLOCK(inp);
 552                         }
 553                         if (stcb)
 554                                 SCTP_TCB_UNLOCK(stcb);
 555                 }
 556         }
 557 }
 558
 559 /*
 560  * this routine can probably be collasped into the one in sctp_userreq.c
 561  * since they do the same thing and now we lookup with a sockaddr
 562  */
 563 static int
 564 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 565 {
 566         struct xucred xuc;
 567         struct sockaddr_in6 addrs[2];
 568         struct sctp_inpcb *inp;
 569         struct sctp_nets *net;
 570         struct sctp_tcb *stcb;
 571         int error;
 572         uint32_t vrf_id;
 573
 574         vrf_id = SCTP_DEFAULT_VRFID;
 575
 576         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 577         if (error)
 578                 return (error);
 579
 580         if (req->newlen != sizeof(addrs)) {
 581                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 582                 return (EINVAL);
 583         }
 584         if (req->oldlen != sizeof(struct ucred)) {
 585                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 586                 return (EINVAL);
 587         }
 588         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 589         if (error)
 590                 return (error);
 591
 592         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
 593             sin6tosa(&addrs[1]),
 594             &inp, &net, 1, vrf_id);
 595         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 596                 if ((inp != NULL) && (stcb == NULL)) {
 597                         /* reduce ref-count */
 598                         SCTP_INP_WLOCK(inp);
 599                         SCTP_INP_DECR_REF(inp);
 600                         goto cred_can_cont;
 601                 }
 602                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 603                 error = ENOENT;
 604                 goto out;
 605         }
 606         SCTP_TCB_UNLOCK(stcb);
 607         /*
 608          * We use the write lock here, only since in the error leg we need
 609          * it. If we used RLOCK, then we would have to
 610          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 611          * Better to use higher wlock.
 612          */
 613         SCTP_INP_WLOCK(inp);
 614 cred_can_cont:
 615         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 616         if (error) {
 617                 SCTP_INP_WUNLOCK(inp);
 618                 goto out;
 619         }
 620         cru2x(inp->sctp_socket->so_cred, &xuc);
 621         SCTP_INP_WUNLOCK(inp);
 622         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 623 out:
 624         return (error);
 625 }
 626
 627 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 628     0, 0,
 629     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 630
 631
 632 /* This is the same as the sctp_abort() could be made common */
 633 static void
 634 sctp6_abort(struct socket *so)
 635 {
 636         struct sctp_inpcb *inp;
 637         uint32_t flags;
 638
 639         inp = (struct sctp_inpcb *)so->so_pcb;
 640         if (inp == NULL) {
 641                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 642                 return;
 643         }
 644 sctp_must_try_again:
 645         flags = inp->sctp_flags;
 646 #ifdef SCTP_LOG_CLOSING
 647         sctp_log_closing(inp, NULL, 17);
 648 #endif
 649         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 650             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 651 #ifdef SCTP_LOG_CLOSING
 652                 sctp_log_closing(inp, NULL, 16);
 653 #endif
 654                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 655                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 656                 SOCK_LOCK(so);
 657                 SCTP_SB_CLEAR(so->so_snd);
 658                 /*
 659                  * same for the rcv ones, they are only here for the
 660                  * accounting/select.
 661                  */
 662                 SCTP_SB_CLEAR(so->so_rcv);
 663                 /* Now null out the reference, we are completely detached. */
 664                 so->so_pcb = NULL;
 665                 SOCK_UNLOCK(so);
 666         } else {
 667                 flags = inp->sctp_flags;
 668                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 669                         goto sctp_must_try_again;
 670                 }
 671         }
 672         return;
 673 }
 674
 675 static int
 676 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 677 {
 678         struct in6pcb *inp6;
 679         int error;
 680         struct sctp_inpcb *inp;
 681         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 682
 683         inp = (struct sctp_inpcb *)so->so_pcb;
 684         if (inp != NULL) {
 685                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 686                 return (EINVAL);
 687         }
 688         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 689                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 690                 if (error)
 691                         return (error);
 692         }
 693         error = sctp_inpcb_alloc(so, vrf_id);
 694         if (error)
 695                 return (error);
 696         inp = (struct sctp_inpcb *)so->so_pcb;
 697         SCTP_INP_WLOCK(inp);
 698         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 699         inp6 = (struct in6pcb *)inp;
 700
 701         inp6->inp_vflag |= INP_IPV6;
 702         inp6->in6p_hops = -1;   /* use kernel default */
 703         inp6->in6p_cksum = -1;  /* just to be sure */
 704 #ifdef INET
 705         /*
 706          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 707          * socket as well, because the socket may be bound to an IPv6
 708          * wildcard address, which may match an IPv4-mapped IPv6 address.
 709          */
 710         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 711 #endif
 712         /*
 713          * Hmm what about the IPSEC stuff that is missing here but in
 714          * sctp_attach()?
 715          */
 716         SCTP_INP_WUNLOCK(inp);
 717         return (0);
 718 }
 719
 720 static int
 721 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 722 {
 723         struct sctp_inpcb *inp;
 724         struct in6pcb *inp6;
 725         int error;
 726
 727         inp = (struct sctp_inpcb *)so->so_pcb;
 728         if (inp == NULL) {
 729                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 730                 return (EINVAL);
 731         }
 732         if (addr) {
 733                 switch (addr->sa_family) {
 734 #ifdef INET
 735                 case AF_INET:
 736                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 737                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 738                                 return (EINVAL);
 739                         }
 740                         break;
 741 #endif
 742 #ifdef INET6
 743                 case AF_INET6:
 744                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 745                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 746                                 return (EINVAL);
 747                         }
 748                         break;
 749 #endif
 750                 default:
 751                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 752                         return (EINVAL);
 753                 }
 754         }
 755         inp6 = (struct in6pcb *)inp;
 756         inp6->inp_vflag &= ~INP_IPV4;
 757         inp6->inp_vflag |= INP_IPV6;
 758         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 759                 switch (addr->sa_family) {
 760 #ifdef INET
 761                 case AF_INET:
 762                         /* binding v4 addr to v6 socket, so reset flags */
 763                         inp6->inp_vflag |= INP_IPV4;
 764                         inp6->inp_vflag &= ~INP_IPV6;
 765                         break;
 766 #endif
 767 #ifdef INET6
 768                 case AF_INET6:
 769                         {
 770                                 struct sockaddr_in6 *sin6_p;
 771
 772                                 sin6_p = (struct sockaddr_in6 *)addr;
 773
 774                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 775                                         inp6->inp_vflag |= INP_IPV4;
 776                                 }
 777 #ifdef INET
 778                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 779                                         struct sockaddr_in sin;
 780
 781                                         in6_sin6_2_sin(&sin, sin6_p);
 782                                         inp6->inp_vflag |= INP_IPV4;
 783                                         inp6->inp_vflag &= ~INP_IPV6;
 784                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 785                                         return (error);
 786                                 }
 787 #endif
 788                                 break;
 789                         }
 790 #endif
 791                 default:
 792                         break;
 793                 }
 794         } else if (addr != NULL) {
 795                 struct sockaddr_in6 *sin6_p;
 796
 797                 /* IPV6_V6ONLY socket */
 798 #ifdef INET
 799                 if (addr->sa_family == AF_INET) {
 800                         /* can't bind v4 addr to v6 only socket! */
 801                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 802                         return (EINVAL);
 803                 }
 804 #endif
 805                 sin6_p = (struct sockaddr_in6 *)addr;
 806
 807                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 808                         /* can't bind v4-mapped addrs either! */
 809                         /* NOTE: we don't support SIIT */
 810                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 811                         return (EINVAL);
 812                 }
 813         }
 814         error = sctp_inpcb_bind(so, addr, NULL, p);
 815         return (error);
 816 }
 817
 818
 819 static void
 820 sctp6_close(struct socket *so)
 821 {
 822         sctp_close(so);
 823 }
 824
 825 /* This could be made common with sctp_detach() since they are identical */
 826
 827 static
 828 int
 829 sctp6_disconnect(struct socket *so)
 830 {
 831         return (sctp_disconnect(so));
 832 }
 833
 834
 835 int
 836 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 837     struct mbuf *control, struct thread *p);
 838
 839
 840 static int
 841 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 842     struct mbuf *control, struct thread *p)
 843 {
 844         struct sctp_inpcb *inp;
 845         struct in6pcb *inp6;
 846
 847 #ifdef INET
 848         struct sockaddr_in6 *sin6;
 849
 850 #endif                          /* INET */
 851         /* No SPL needed since sctp_output does this */
 852
 853         inp = (struct sctp_inpcb *)so->so_pcb;
 854         if (inp == NULL) {
 855                 if (control) {
 856                         SCTP_RELEASE_PKT(control);
 857                         control = NULL;
 858                 }
 859                 SCTP_RELEASE_PKT(m);
 860                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 861                 return (EINVAL);
 862         }
 863         inp6 = (struct in6pcb *)inp;
 864         /*
 865          * For the TCP model we may get a NULL addr, if we are a connected
 866          * socket thats ok.
 867          */
 868         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 869             (addr == NULL)) {
 870                 goto connected_type;
 871         }
 872         if (addr == NULL) {
 873                 SCTP_RELEASE_PKT(m);
 874                 if (control) {
 875                         SCTP_RELEASE_PKT(control);
 876                         control = NULL;
 877                 }
 878                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 879                 return (EDESTADDRREQ);
 880         }
 881 #ifdef INET
 882         sin6 = (struct sockaddr_in6 *)addr;
 883         if (SCTP_IPV6_V6ONLY(inp6)) {
 884                 /*
 885                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 886                  * v4 addr or v4-mapped addr
 887                  */
 888                 if (addr->sa_family == AF_INET) {
 889                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 890                         return (EINVAL);
 891                 }
 892                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 893                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 894                         return (EINVAL);
 895                 }
 896         }
 897         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 898                 if (!MODULE_GLOBAL(ip6_v6only)) {
 899                         struct sockaddr_in sin;
 900
 901                         /* convert v4-mapped into v4 addr and send */
 902                         in6_sin6_2_sin(&sin, sin6);
 903                         return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 904                             control, p));
 905                 } else {
 906                         /* mapped addresses aren't enabled */
 907                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 908                         return (EINVAL);
 909                 }
 910         }
 911 #endif                          /* INET */
 912 connected_type:
 913         /* now what about control */
 914         if (control) {
 915                 if (inp->control) {
 916                         SCTP_PRINTF("huh? control set?\n");
 917                         SCTP_RELEASE_PKT(inp->control);
 918                         inp->control = NULL;
 919                 }
 920                 inp->control = control;
 921         }
 922         /* Place the data */
 923         if (inp->pkt) {
 924                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 925                 inp->pkt_last = m;
 926         } else {
 927                 inp->pkt_last = inp->pkt = m;
 928         }
 929         if (
 930         /* FreeBSD and MacOSX uses a flag passed */
 931             ((flags & PRUS_MORETOCOME) == 0)
 932             ) {
 933                 /*
 934                  * note with the current version this code will only be used
 935                  * by OpenBSD, NetBSD and FreeBSD have methods for
 936                  * re-defining sosend() to use sctp_sosend().  One can
 937                  * optionaly switch back to this code (by changing back the
 938                  * defininitions but this is not advisable.
 939                  */
 940                 int ret;
 941
 942                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 943                 inp->pkt = NULL;
 944                 inp->control = NULL;
 945                 return (ret);
 946         } else {
 947                 return (0);
 948         }
 949 }
 950
 951 static int
 952 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 953 {
 954         uint32_t vrf_id;
 955         int error = 0;
 956         struct sctp_inpcb *inp;
 957         struct in6pcb *inp6;
 958         struct sctp_tcb *stcb;
 959
 960 #ifdef INET
 961         struct sockaddr_in6 *sin6;
 962         struct sockaddr_storage ss;
 963
 964 #endif
 965
 966         inp6 = (struct in6pcb *)so->so_pcb;
 967         inp = (struct sctp_inpcb *)so->so_pcb;
 968         if (inp == NULL) {
 969                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 970                 return (ECONNRESET);    /* I made the same as TCP since we are
 971                                          * not setup? */
 972         }
 973         if (addr == NULL) {
 974                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 975                 return (EINVAL);
 976         }
 977         switch (addr->sa_family) {
 978 #ifdef INET
 979         case AF_INET:
 980                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 981                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 982                         return (EINVAL);
 983                 }
 984                 break;
 985 #endif
 986 #ifdef INET6
 987         case AF_INET6:
 988                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 989                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 990                         return (EINVAL);
 991                 }
 992                 break;
 993 #endif
 994         default:
 995                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 996                 return (EINVAL);
 997         }
 998
 999         vrf_id = inp->def_vrf_id;
1000         SCTP_ASOC_CREATE_LOCK(inp);
1001         SCTP_INP_RLOCK(inp);
1002         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
1003             SCTP_PCB_FLAGS_UNBOUND) {
1004                 /* Bind a ephemeral port */
1005                 SCTP_INP_RUNLOCK(inp);
1006                 error = sctp6_bind(so, NULL, p);
1007                 if (error) {
1008                         SCTP_ASOC_CREATE_UNLOCK(inp);
1009
1010                         return (error);
1011                 }
1012                 SCTP_INP_RLOCK(inp);
1013         }
1014         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
1015             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
1016                 /* We are already connected AND the TCP model */
1017                 SCTP_INP_RUNLOCK(inp);
1018                 SCTP_ASOC_CREATE_UNLOCK(inp);
1019                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
1020                 return (EADDRINUSE);
1021         }
1022 #ifdef INET
1023         sin6 = (struct sockaddr_in6 *)addr;
1024         if (SCTP_IPV6_V6ONLY(inp6)) {
1025                 /*
1026                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
1027                  * addr or v4-mapped addr
1028                  */
1029                 if (addr->sa_family == AF_INET) {
1030                         SCTP_INP_RUNLOCK(inp);
1031                         SCTP_ASOC_CREATE_UNLOCK(inp);
1032                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1033                         return (EINVAL);
1034                 }
1035                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1036                         SCTP_INP_RUNLOCK(inp);
1037                         SCTP_ASOC_CREATE_UNLOCK(inp);
1038                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1039                         return (EINVAL);
1040                 }
1041         }
1042         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1043                 if (!MODULE_GLOBAL(ip6_v6only)) {
1044                         /* convert v4-mapped into v4 addr */
1045                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
1046                         addr = (struct sockaddr *)&ss;
1047                 } else {
1048                         /* mapped addresses aren't enabled */
1049                         SCTP_INP_RUNLOCK(inp);
1050                         SCTP_ASOC_CREATE_UNLOCK(inp);
1051                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1052                         return (EINVAL);
1053                 }
1054         }
1055 #endif                          /* INET */
1056         /* Now do we connect? */
1057         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1058                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1059                 if (stcb) {
1060                         SCTP_TCB_UNLOCK(stcb);
1061                 }
1062                 SCTP_INP_RUNLOCK(inp);
1063         } else {
1064                 SCTP_INP_RUNLOCK(inp);
1065                 SCTP_INP_WLOCK(inp);
1066                 SCTP_INP_INCR_REF(inp);
1067                 SCTP_INP_WUNLOCK(inp);
1068                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
1069                 if (stcb == NULL) {
1070                         SCTP_INP_WLOCK(inp);
1071                         SCTP_INP_DECR_REF(inp);
1072                         SCTP_INP_WUNLOCK(inp);
1073                 }
1074         }
1075
1076         if (stcb != NULL) {
1077                 /* Already have or am bring up an association */
1078                 SCTP_ASOC_CREATE_UNLOCK(inp);
1079                 SCTP_TCB_UNLOCK(stcb);
1080                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
1081                 return (EALREADY);
1082         }
1083         /* We are GOOD to go */
1084         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
1085         SCTP_ASOC_CREATE_UNLOCK(inp);
1086         if (stcb == NULL) {
1087                 /* Gak! no memory */
1088                 return (error);
1089         }
1090         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
1091                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1092                 /* Set the connected flag so we can queue data */
1093                 soisconnecting(so);
1094         }
1095         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
1096         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1097
1098         /* initialize authentication parameters for the assoc */
1099         sctp_initialize_auth_params(inp, stcb);
1100
1101         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
1102         SCTP_TCB_UNLOCK(stcb);
1103         return (error);
1104 }
1105
1106 static int
1107 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
1108 {
1109         struct sockaddr_in6 *sin6;
1110         struct sctp_inpcb *inp;
1111         uint32_t vrf_id;
1112         struct sctp_ifa *sctp_ifa;
1113
1114         int error;
1115
1116         /*
1117          * Do the malloc first in case it blocks.
1118          */
1119         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
1120         if (sin6 == NULL)
1121                 return (ENOMEM);
1122         sin6->sin6_family = AF_INET6;
1123         sin6->sin6_len = sizeof(*sin6);
1124
1125         inp = (struct sctp_inpcb *)so->so_pcb;
1126         if (inp == NULL) {
1127                 SCTP_FREE_SONAME(sin6);
1128                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1129                 return (ECONNRESET);
1130         }
1131         SCTP_INP_RLOCK(inp);
1132         sin6->sin6_port = inp->sctp_lport;
1133         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1134                 /* For the bound all case you get back 0 */
1135                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1136                         struct sctp_tcb *stcb;
1137                         struct sockaddr_in6 *sin_a6;
1138                         struct sctp_nets *net;
1139                         int fnd;
1140
1141                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1142                         if (stcb == NULL) {
1143                                 goto notConn6;
1144                         }
1145                         fnd = 0;
1146                         sin_a6 = NULL;
1147                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1148                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1149                                 if (sin_a6 == NULL)
1150                                         /* this will make coverity happy */
1151                                         continue;
1152
1153                                 if (sin_a6->sin6_family == AF_INET6) {
1154                                         fnd = 1;
1155                                         break;
1156                                 }
1157                         }
1158                         if ((!fnd) || (sin_a6 == NULL)) {
1159                                 /* punt */
1160                                 goto notConn6;
1161                         }
1162                         vrf_id = inp->def_vrf_id;
1163                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1164                         if (sctp_ifa) {
1165                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1166                         }
1167                 } else {
1168                         /* For the bound all case you get back 0 */
1169         notConn6:
1170                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1171                 }
1172         } else {
1173                 /* Take the first IPv6 address in the list */
1174                 struct sctp_laddr *laddr;
1175                 int fnd = 0;
1176
1177                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1178                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1179                                 struct sockaddr_in6 *sin_a;
1180
1181                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1182                                 sin6->sin6_addr = sin_a->sin6_addr;
1183                                 fnd = 1;
1184                                 break;
1185                         }
1186                 }
1187                 if (!fnd) {
1188                         SCTP_FREE_SONAME(sin6);
1189                         SCTP_INP_RUNLOCK(inp);
1190                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1191                         return (ENOENT);
1192                 }
1193         }
1194         SCTP_INP_RUNLOCK(inp);
1195         /* Scoping things for v6 */
1196         if ((error = sa6_recoverscope(sin6)) != 0) {
1197                 SCTP_FREE_SONAME(sin6);
1198                 return (error);
1199         }
1200         (*addr) = (struct sockaddr *)sin6;
1201         return (0);
1202 }
1203
1204 static int
1205 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1206 {
1207         struct sockaddr_in6 *sin6;
1208         int fnd;
1209         struct sockaddr_in6 *sin_a6;
1210         struct sctp_inpcb *inp;
1211         struct sctp_tcb *stcb;
1212         struct sctp_nets *net;
1213         int error;
1214
1215         /* Do the malloc first in case it blocks. */
1216         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1217         if (sin6 == NULL)
1218                 return (ENOMEM);
1219         sin6->sin6_family = AF_INET6;
1220         sin6->sin6_len = sizeof(*sin6);
1221
1222         inp = (struct sctp_inpcb *)so->so_pcb;
1223         if ((inp == NULL) ||
1224             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1225                 /* UDP type and listeners will drop out here */
1226                 SCTP_FREE_SONAME(sin6);
1227                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1228                 return (ENOTCONN);
1229         }
1230         SCTP_INP_RLOCK(inp);
1231         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1232         if (stcb) {
1233                 SCTP_TCB_LOCK(stcb);
1234         }
1235         SCTP_INP_RUNLOCK(inp);
1236         if (stcb == NULL) {
1237                 SCTP_FREE_SONAME(sin6);
1238                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1239                 return (ECONNRESET);
1240         }
1241         fnd = 0;
1242         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1243                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1244                 if (sin_a6->sin6_family == AF_INET6) {
1245                         fnd = 1;
1246                         sin6->sin6_port = stcb->rport;
1247                         sin6->sin6_addr = sin_a6->sin6_addr;
1248                         break;
1249                 }
1250         }
1251         SCTP_TCB_UNLOCK(stcb);
1252         if (!fnd) {
1253                 /* No IPv4 address */
1254                 SCTP_FREE_SONAME(sin6);
1255                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1256                 return (ENOENT);
1257         }
1258         if ((error = sa6_recoverscope(sin6)) != 0)
1259                 return (error);
1260         *addr = (struct sockaddr *)sin6;
1261         return (0);
1262 }
1263
1264 static int
1265 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1266 {
1267 #ifdef INET
1268         struct sockaddr *addr;
1269
1270 #endif
1271         struct in6pcb *inp6 = sotoin6pcb(so);
1272         int error;
1273
1274         if (inp6 == NULL) {
1275                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1276                 return (EINVAL);
1277         }
1278         /* allow v6 addresses precedence */
1279         error = sctp6_getaddr(so, nam);
1280 #ifdef INET
1281         if (error) {
1282                 /* try v4 next if v6 failed */
1283                 error = sctp_ingetaddr(so, nam);
1284                 if (error) {
1285                         return (error);
1286                 }
1287                 addr = *nam;
1288                 /* if I'm V6ONLY, convert it to v4-mapped */
1289                 if (SCTP_IPV6_V6ONLY(inp6)) {
1290                         struct sockaddr_in6 sin6;
1291
1292                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1293                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1294                 }
1295         }
1296 #endif
1297         return (error);
1298 }
1299
1300
1301 static int
1302 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1303 {
1304 #ifdef INET
1305         struct sockaddr *addr;
1306
1307 #endif
1308         struct in6pcb *inp6 = sotoin6pcb(so);
1309         int error;
1310
1311         if (inp6 == NULL) {
1312                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1313                 return (EINVAL);
1314         }
1315         /* allow v6 addresses precedence */
1316         error = sctp6_peeraddr(so, nam);
1317 #ifdef INET
1318         if (error) {
1319                 /* try v4 next if v6 failed */
1320                 error = sctp_peeraddr(so, nam);
1321                 if (error) {
1322                         return (error);
1323                 }
1324                 addr = *nam;
1325                 /* if I'm V6ONLY, convert it to v4-mapped */
1326                 if (SCTP_IPV6_V6ONLY(inp6)) {
1327                         struct sockaddr_in6 sin6;
1328
1329                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1330                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1331                 }
1332         }
1333 #endif
1334         return (error);
1335 }
1336
1337 struct pr_usrreqs sctp6_usrreqs = {
1338         .pru_abort = sctp6_abort,
1339         .pru_accept = sctp_accept,
1340         .pru_attach = sctp6_attach,
1341         .pru_bind = sctp6_bind,
1342         .pru_connect = sctp6_connect,
1343         .pru_control = in6_control,
1344         .pru_close = sctp6_close,
1345         .pru_detach = sctp6_close,
1346         .pru_sopoll = sopoll_generic,
1347         .pru_flush = sctp_flush,
1348         .pru_disconnect = sctp6_disconnect,
1349         .pru_listen = sctp_listen,
1350         .pru_peeraddr = sctp6_getpeeraddr,
1351         .pru_send = sctp6_send,
1352         .pru_shutdown = sctp_shutdown,
1353         .pru_sockaddr = sctp6_in6getaddr,
1354         .pru_sosend = sctp_sosend,
1355         .pru_soreceive = sctp_soreceive
1356 };