sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30 /*      $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $      */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include <netinet/sctp_os.h>
  36 #include <sys/proc.h>
  37 #include <netinet/sctp_pcb.h>
  38 #include <netinet/sctp_header.h>
  39 #include <netinet/sctp_var.h>
  40 #if defined(INET6)
  41 #include <netinet6/sctp6_var.h>
  42 #endif
  43 #include <netinet/sctp_sysctl.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_uio.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_indata.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_auth.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_output.h>
  53 #include <netinet/sctp_bsd_addr.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/udp.h>
  56
  57 #ifdef IPSEC
  58 #include <netipsec/ipsec.h>
  59 #if defined(INET6)
  60 #include <netipsec/ipsec6.h>
  61 #endif                          /* INET6 */
  62 #endif                          /* IPSEC */
  63
  64 extern struct protosw inetsw[];
  65
  66 int
  67 sctp6_input(struct mbuf **i_pak, int *offp, int proto)
  68 {
  69         struct mbuf *m;
  70         struct ip6_hdr *ip6;
  71         struct sctphdr *sh;
  72         struct sctp_inpcb *in6p = NULL;
  73         struct sctp_nets *net;
  74         int refcount_up = 0;
  75         uint32_t check, calc_check;
  76         uint32_t vrf_id = 0;
  77         struct inpcb *in6p_ip;
  78         struct sctp_chunkhdr *ch;
  79         int length, offset, iphlen;
  80         uint8_t ecn_bits;
  81         struct sctp_tcb *stcb = NULL;
  82         int pkt_len = 0;
  83         int off = *offp;
  84         uint16_t port = 0;
  85
  86         /* get the VRF and table id's */
  87         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  88                 SCTP_RELEASE_PKT(*i_pak);
  89                 return (-1);
  90         }
  91         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  92         pkt_len = SCTP_HEADER_LEN((*i_pak));
  93
  94 #ifdef  SCTP_PACKET_LOGGING
  95         sctp_packet_log(m, pkt_len);
  96 #endif
  97         ip6 = mtod(m, struct ip6_hdr *);
  98         /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
  99         IP6_EXTHDR_GET(sh, struct sctphdr *, m, off,
 100             (int)(sizeof(*sh) + sizeof(*ch)));
 101         if (sh == NULL) {
 102                 SCTP_STAT_INCR(sctps_hdrops);
 103                 return IPPROTO_DONE;
 104         }
 105         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 106         iphlen = off;
 107         offset = iphlen + sizeof(*sh) + sizeof(*ch);
 108         SCTPDBG(SCTP_DEBUG_INPUT1,
 109             "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen);
 110
 111
 112 #if defined(NFAITH) && NFAITH > 0
 113
 114         if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
 115                 /* XXX send icmp6 host/port unreach? */
 116                 goto bad;
 117         }
 118 #endif                          /* NFAITH defined and > 0 */
 119         SCTP_STAT_INCR(sctps_recvpackets);
 120         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 121         SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n",
 122             iphlen, pkt_len);
 123         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 124                 /* No multi-cast support in SCTP */
 125                 goto bad;
 126         }
 127         /* destination port of 0 is illegal, based on RFC2960. */
 128         if (sh->dest_port == 0)
 129                 goto bad;
 130
 131         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 132             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
 133             m->m_pkthdr.len,
 134             if_name(m->m_pkthdr.rcvif),
 135             m->m_pkthdr.csum_flags);
 136         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 137                 SCTP_STAT_INCR(sctps_recvhwcrc);
 138                 goto sctp_skip_csum;
 139         }
 140         check = sh->checksum;   /* save incoming checksum */
 141         if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) &&
 142             (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) {
 143                 SCTP_STAT_INCR(sctps_recvnocrc);
 144                 goto sctp_skip_csum;
 145         }
 146         sh->checksum = 0;       /* prepare for calc */
 147         calc_check = sctp_calculate_cksum(m, iphlen);
 148         SCTP_STAT_INCR(sctps_recvswcrc);
 149         if (calc_check != check) {
 150                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p phlen:%d\n",
 151                     calc_check, check, m, iphlen);
 152                 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 153                     sh, ch, &in6p, &net, vrf_id);
 154                 if ((net) && (port)) {
 155                         if (net->port == 0) {
 156                                 sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 157                         }
 158                         net->port = port;
 159                 }
 160                 /* in6p's ref-count increased && stcb locked */
 161                 if ((in6p) && (stcb)) {
 162                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
 163                         sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 164                 } else if ((in6p != NULL) && (stcb == NULL)) {
 165                         refcount_up = 1;
 166                 }
 167                 SCTP_STAT_INCR(sctps_badsum);
 168                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 169                 goto bad;
 170         }
 171         sh->checksum = calc_check;
 172
 173 sctp_skip_csum:
 174         net = NULL;
 175         /*
 176          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
 177          * IP/SCTP/first chunk header...
 178          */
 179         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 180             sh, ch, &in6p, &net, vrf_id);
 181         if ((net) && (port)) {
 182                 if (net->port == 0) {
 183                         sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 184                 }
 185                 net->port = port;
 186         }
 187         /* in6p's ref-count increased */
 188         if (in6p == NULL) {
 189                 struct sctp_init_chunk *init_chk, chunk_buf;
 190
 191                 SCTP_STAT_INCR(sctps_noport);
 192                 if (ch->chunk_type == SCTP_INITIATION) {
 193                         /*
 194                          * we do a trick here to get the INIT tag, dig in
 195                          * and get the tag from the INIT and put it in the
 196                          * common header.
 197                          */
 198                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
 199                             iphlen + sizeof(*sh), sizeof(*init_chk),
 200                             (uint8_t *) & chunk_buf);
 201                         if (init_chk)
 202                                 sh->v_tag = init_chk->init.initiate_tag;
 203                         else
 204                                 sh->v_tag = 0;
 205                 }
 206                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 207                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
 208                         goto bad;
 209                 }
 210                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 211                         goto bad;
 212                 }
 213                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
 214                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
 215                 goto bad;
 216         } else if (stcb == NULL) {
 217                 refcount_up = 1;
 218         }
 219         in6p_ip = (struct inpcb *)in6p;
 220 #ifdef IPSEC
 221         /*
 222          * Check AH/ESP integrity.
 223          */
 224         if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) {
 225 /* XXX */
 226                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
 227                 goto bad;
 228         }
 229 #endif                          /* IPSEC */
 230
 231         /*
 232          * CONTROL chunk processing
 233          */
 234         offset -= sizeof(*ch);
 235         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 236
 237         /* Length now holds the total packet length payload + iphlen */
 238         length = ntohs(ip6->ip6_plen) + iphlen;
 239
 240         /* sa_ignore NO_NULL_CHK */
 241         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
 242             in6p, stcb, net, ecn_bits, vrf_id, port);
 243         /* inp's ref-count reduced && stcb unlocked */
 244         /* XXX this stuff below gets moved to appropriate parts later... */
 245         if (m)
 246                 sctp_m_freem(m);
 247         if ((in6p) && refcount_up) {
 248                 /* reduce ref-count */
 249                 SCTP_INP_WLOCK(in6p);
 250                 SCTP_INP_DECR_REF(in6p);
 251                 SCTP_INP_WUNLOCK(in6p);
 252         }
 253         return IPPROTO_DONE;
 254
 255 bad:
 256         if (stcb) {
 257                 SCTP_TCB_UNLOCK(stcb);
 258         }
 259         if ((in6p) && refcount_up) {
 260                 /* reduce ref-count */
 261                 SCTP_INP_WLOCK(in6p);
 262                 SCTP_INP_DECR_REF(in6p);
 263                 SCTP_INP_WUNLOCK(in6p);
 264         }
 265         if (m)
 266                 sctp_m_freem(m);
 267         return IPPROTO_DONE;
 268 }
 269
 270
 271 static void
 272 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 273     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 274 {
 275         uint32_t nxtsz;
 276
 277         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 278             (icmp6 == NULL) || (sh == NULL)) {
 279                 goto out;
 280         }
 281         /* First do we even look at it? */
 282         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 283                 goto out;
 284
 285         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 286                 /* not PACKET TO BIG */
 287                 goto out;
 288         }
 289         /*
 290          * ok we need to look closely. We could even get smarter and look at
 291          * anyone that we sent to in case we get a different ICMP that tells
 292          * us there is no way to reach a host, but for this impl, all we
 293          * care about is MTU discovery.
 294          */
 295         nxtsz = ntohl(icmp6->icmp6_mtu);
 296         /* Stop any PMTU timer */
 297         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 298
 299         /* Adjust destination size limit */
 300         if (net->mtu > nxtsz) {
 301                 net->mtu = nxtsz;
 302                 if (net->port) {
 303                         net->mtu -= sizeof(struct udphdr);
 304                 }
 305         }
 306         /* now what about the ep? */
 307         if (stcb->asoc.smallest_mtu > nxtsz) {
 308                 struct sctp_tmit_chunk *chk;
 309
 310                 /* Adjust that too */
 311                 stcb->asoc.smallest_mtu = nxtsz;
 312                 /* now off to subtract IP_DF flag if needed */
 313
 314                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 315                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 316                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 317                         }
 318                 }
 319                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 320                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 321                                 /*
 322                                  * For this guy we also mark for immediate
 323                                  * resend since we sent to big of chunk
 324                                  */
 325                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 326                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 327                                         stcb->asoc.sent_queue_retran_cnt++;
 328                                 chk->sent = SCTP_DATAGRAM_RESEND;
 329                                 chk->rec.data.doing_fast_retransmit = 0;
 330
 331                                 chk->sent = SCTP_DATAGRAM_RESEND;
 332                                 /* Clear any time so NO RTT is being done */
 333                                 chk->sent_rcv_time.tv_sec = 0;
 334                                 chk->sent_rcv_time.tv_usec = 0;
 335                                 stcb->asoc.total_flight -= chk->send_size;
 336                                 net->flight_size -= chk->send_size;
 337                         }
 338                 }
 339         }
 340         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 341 out:
 342         if (stcb) {
 343                 SCTP_TCB_UNLOCK(stcb);
 344         }
 345 }
 346
 347
 348 void
 349 sctp6_notify(struct sctp_inpcb *inp,
 350     struct icmp6_hdr *icmph,
 351     struct sctphdr *sh,
 352     struct sockaddr *to,
 353     struct sctp_tcb *stcb,
 354     struct sctp_nets *net)
 355 {
 356 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 357         struct socket *so;
 358
 359 #endif
 360         /* protection */
 361         int reason;
 362
 363
 364         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 365             (sh == NULL) || (to == NULL)) {
 366                 if (stcb)
 367                         SCTP_TCB_UNLOCK(stcb);
 368                 return;
 369         }
 370         /* First job is to verify the vtag matches what I would send */
 371         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 372                 SCTP_TCB_UNLOCK(stcb);
 373                 return;
 374         }
 375         if (icmph->icmp6_type != ICMP_UNREACH) {
 376                 /* We only care about unreachable */
 377                 SCTP_TCB_UNLOCK(stcb);
 378                 return;
 379         }
 380         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 381             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 382             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 383             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 384             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 385             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 386             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 387             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 388
 389                 /*
 390                  * Hmm reachablity problems we must examine closely. If its
 391                  * not reachable, we may have lost a network. Or if there is
 392                  * NO protocol at the other end named SCTP. well we consider
 393                  * it a OOTB abort.
 394                  */
 395                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 396                         /* Ok that destination is NOT reachable */
 397                         SCTP_PRINTF("ICMP (thresh %d/%d) takes interface %p down\n",
 398                             net->error_count,
 399                             net->failure_threshold,
 400                             net);
 401
 402                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 403                         net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
 404                         /*
 405                          * JRS 5/14/07 - If a destination is unreachable,
 406                          * the PF bit is turned off.  This allows an
 407                          * unambiguous use of the PF bit for destinations
 408                          * that are reachable but potentially failed. If the
 409                          * destination is set to the unreachable state, also
 410                          * set the destination to the PF state.
 411                          */
 412                         /*
 413                          * Add debug message here if destination is not in
 414                          * PF state.
 415                          */
 416                         /* Stop any running T3 timers here? */
 417                         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
 418                                 net->dest_state &= ~SCTP_ADDR_PF;
 419                                 SCTPDBG(SCTP_DEBUG_TIMER4, "Destination %p moved from PF to unreachable.\n",
 420                                     net);
 421                         }
 422                         net->error_count = net->failure_threshold + 1;
 423                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 424                             stcb, SCTP_FAILED_THRESHOLD,
 425                             (void *)net, SCTP_SO_NOT_LOCKED);
 426                 }
 427                 SCTP_TCB_UNLOCK(stcb);
 428         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 429             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 430                 /*
 431                  * Here the peer is either playing tricks on us, including
 432                  * an address that belongs to someone who does not support
 433                  * SCTP OR was a userland implementation that shutdown and
 434                  * now is dead. In either case treat it like a OOTB abort
 435                  * with no TCB
 436                  */
 437                 reason = SCTP_PEER_FAULTY;
 438                 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED);
 439 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 440                 so = SCTP_INP_SO(inp);
 441                 atomic_add_int(&stcb->asoc.refcnt, 1);
 442                 SCTP_TCB_UNLOCK(stcb);
 443                 SCTP_SOCKET_LOCK(so, 1);
 444                 SCTP_TCB_LOCK(stcb);
 445                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 446 #endif
 447                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 448 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 449                 SCTP_SOCKET_UNLOCK(so, 1);
 450                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 451 #endif
 452                 /* no need to unlock here, since the TCB is gone */
 453         } else {
 454                 SCTP_TCB_UNLOCK(stcb);
 455         }
 456 }
 457
 458
 459
 460 void
 461 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 462 {
 463         struct sctphdr sh;
 464         struct ip6ctlparam *ip6cp = NULL;
 465         uint32_t vrf_id;
 466
 467         vrf_id = SCTP_DEFAULT_VRFID;
 468
 469         if (pktdst->sa_family != AF_INET6 ||
 470             pktdst->sa_len != sizeof(struct sockaddr_in6))
 471                 return;
 472
 473         if ((unsigned)cmd >= PRC_NCMDS)
 474                 return;
 475         if (PRC_IS_REDIRECT(cmd)) {
 476                 d = NULL;
 477         } else if (inet6ctlerrmap[cmd] == 0) {
 478                 return;
 479         }
 480         /* if the parameter is from icmp6, decode it. */
 481         if (d != NULL) {
 482                 ip6cp = (struct ip6ctlparam *)d;
 483         } else {
 484                 ip6cp = (struct ip6ctlparam *)NULL;
 485         }
 486
 487         if (ip6cp) {
 488                 /*
 489                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 490                  * valid.
 491                  */
 492                 /* check if we can safely examine src and dst ports */
 493                 struct sctp_inpcb *inp = NULL;
 494                 struct sctp_tcb *stcb = NULL;
 495                 struct sctp_nets *net = NULL;
 496                 struct sockaddr_in6 final;
 497
 498                 if (ip6cp->ip6c_m == NULL)
 499                         return;
 500
 501                 bzero(&sh, sizeof(sh));
 502                 bzero(&final, sizeof(final));
 503                 inp = NULL;
 504                 net = NULL;
 505                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 506                     (caddr_t)&sh);
 507                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 508                 final.sin6_len = sizeof(final);
 509                 final.sin6_family = AF_INET6;
 510                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 511                 final.sin6_port = sh.dest_port;
 512                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
 513                     (struct sockaddr *)&final,
 514                     &inp, &net, 1, vrf_id);
 515                 /* inp's ref-count increased && stcb locked */
 516                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 517                         if (cmd == PRC_MSGSIZE) {
 518                                 sctp6_notify_mbuf(inp,
 519                                     ip6cp->ip6c_icmp6,
 520                                     &sh,
 521                                     stcb,
 522                                     net);
 523                                 /* inp's ref-count reduced && stcb unlocked */
 524                         } else {
 525                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 526                                     (struct sockaddr *)&final,
 527                                     stcb, net);
 528                                 /* inp's ref-count reduced && stcb unlocked */
 529                         }
 530                 } else {
 531                         if (PRC_IS_REDIRECT(cmd) && inp) {
 532                                 in6_rtchange((struct in6pcb *)inp,
 533                                     inet6ctlerrmap[cmd]);
 534                         }
 535                         if (inp) {
 536                                 /* reduce inp's ref-count */
 537                                 SCTP_INP_WLOCK(inp);
 538                                 SCTP_INP_DECR_REF(inp);
 539                                 SCTP_INP_WUNLOCK(inp);
 540                         }
 541                         if (stcb)
 542                                 SCTP_TCB_UNLOCK(stcb);
 543                 }
 544         }
 545 }
 546
 547 /*
 548  * this routine can probably be collasped into the one in sctp_userreq.c
 549  * since they do the same thing and now we lookup with a sockaddr
 550  */
 551 static int
 552 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 553 {
 554         struct xucred xuc;
 555         struct sockaddr_in6 addrs[2];
 556         struct sctp_inpcb *inp;
 557         struct sctp_nets *net;
 558         struct sctp_tcb *stcb;
 559         int error;
 560         uint32_t vrf_id;
 561
 562         vrf_id = SCTP_DEFAULT_VRFID;
 563
 564         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 565         if (error)
 566                 return (error);
 567
 568         if (req->newlen != sizeof(addrs)) {
 569                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 570                 return (EINVAL);
 571         }
 572         if (req->oldlen != sizeof(struct ucred)) {
 573                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 574                 return (EINVAL);
 575         }
 576         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 577         if (error)
 578                 return (error);
 579
 580         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
 581             sin6tosa(&addrs[1]),
 582             &inp, &net, 1, vrf_id);
 583         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 584                 if ((inp != NULL) && (stcb == NULL)) {
 585                         /* reduce ref-count */
 586                         SCTP_INP_WLOCK(inp);
 587                         SCTP_INP_DECR_REF(inp);
 588                         goto cred_can_cont;
 589                 }
 590                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 591                 error = ENOENT;
 592                 goto out;
 593         }
 594         SCTP_TCB_UNLOCK(stcb);
 595         /*
 596          * We use the write lock here, only since in the error leg we need
 597          * it. If we used RLOCK, then we would have to
 598          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 599          * Better to use higher wlock.
 600          */
 601         SCTP_INP_WLOCK(inp);
 602 cred_can_cont:
 603         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 604         if (error) {
 605                 SCTP_INP_WUNLOCK(inp);
 606                 goto out;
 607         }
 608         cru2x(inp->sctp_socket->so_cred, &xuc);
 609         SCTP_INP_WUNLOCK(inp);
 610         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 611 out:
 612         return (error);
 613 }
 614
 615 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 616     0, 0,
 617     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 618
 619
 620 /* This is the same as the sctp_abort() could be made common */
 621 static void
 622 sctp6_abort(struct socket *so)
 623 {
 624         struct sctp_inpcb *inp;
 625         uint32_t flags;
 626
 627         inp = (struct sctp_inpcb *)so->so_pcb;
 628         if (inp == 0) {
 629                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 630                 return;
 631         }
 632 sctp_must_try_again:
 633         flags = inp->sctp_flags;
 634 #ifdef SCTP_LOG_CLOSING
 635         sctp_log_closing(inp, NULL, 17);
 636 #endif
 637         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 638             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 639 #ifdef SCTP_LOG_CLOSING
 640                 sctp_log_closing(inp, NULL, 16);
 641 #endif
 642                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 643                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 644                 SOCK_LOCK(so);
 645                 SCTP_SB_CLEAR(so->so_snd);
 646                 /*
 647                  * same for the rcv ones, they are only here for the
 648                  * accounting/select.
 649                  */
 650                 SCTP_SB_CLEAR(so->so_rcv);
 651                 /* Now null out the reference, we are completely detached. */
 652                 so->so_pcb = NULL;
 653                 SOCK_UNLOCK(so);
 654         } else {
 655                 flags = inp->sctp_flags;
 656                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 657                         goto sctp_must_try_again;
 658                 }
 659         }
 660         return;
 661 }
 662
 663 static int
 664 sctp6_attach(struct socket *so, int proto, struct thread *p)
 665 {
 666         struct in6pcb *inp6;
 667         int error;
 668         struct sctp_inpcb *inp;
 669         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 670
 671         inp = (struct sctp_inpcb *)so->so_pcb;
 672         if (inp != NULL) {
 673                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 674                 return EINVAL;
 675         }
 676         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 677                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 678                 if (error)
 679                         return error;
 680         }
 681         error = sctp_inpcb_alloc(so, vrf_id);
 682         if (error)
 683                 return error;
 684         inp = (struct sctp_inpcb *)so->so_pcb;
 685         SCTP_INP_WLOCK(inp);
 686         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 687         inp6 = (struct in6pcb *)inp;
 688
 689         inp6->inp_vflag |= INP_IPV6;
 690         inp6->in6p_hops = -1;   /* use kernel default */
 691         inp6->in6p_cksum = -1;  /* just to be sure */
 692 #ifdef INET
 693         /*
 694          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 695          * socket as well, because the socket may be bound to an IPv6
 696          * wildcard address, which may match an IPv4-mapped IPv6 address.
 697          */
 698         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 699 #endif
 700         /*
 701          * Hmm what about the IPSEC stuff that is missing here but in
 702          * sctp_attach()?
 703          */
 704         SCTP_INP_WUNLOCK(inp);
 705         return 0;
 706 }
 707
 708 static int
 709 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 710 {
 711         struct sctp_inpcb *inp;
 712         struct in6pcb *inp6;
 713         int error;
 714
 715         inp = (struct sctp_inpcb *)so->so_pcb;
 716         if (inp == 0) {
 717                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 718                 return EINVAL;
 719         }
 720         if (addr) {
 721                 if ((addr->sa_family == AF_INET6) &&
 722                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
 723                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 724                         return EINVAL;
 725                 }
 726                 if ((addr->sa_family == AF_INET) &&
 727                     (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         }
 732         inp6 = (struct in6pcb *)inp;
 733         inp6->inp_vflag &= ~INP_IPV4;
 734         inp6->inp_vflag |= INP_IPV6;
 735         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 736                 if (addr->sa_family == AF_INET) {
 737                         /* binding v4 addr to v6 socket, so reset flags */
 738                         inp6->inp_vflag |= INP_IPV4;
 739                         inp6->inp_vflag &= ~INP_IPV6;
 740                 } else {
 741                         struct sockaddr_in6 *sin6_p;
 742
 743                         sin6_p = (struct sockaddr_in6 *)addr;
 744
 745                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 746                                 inp6->inp_vflag |= INP_IPV4;
 747                         } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 748                                 struct sockaddr_in sin;
 749
 750                                 in6_sin6_2_sin(&sin, sin6_p);
 751                                 inp6->inp_vflag |= INP_IPV4;
 752                                 inp6->inp_vflag &= ~INP_IPV6;
 753                                 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 754                                 return error;
 755                         }
 756                 }
 757         } else if (addr != NULL) {
 758                 /* IPV6_V6ONLY socket */
 759                 if (addr->sa_family == AF_INET) {
 760                         /* can't bind v4 addr to v6 only socket! */
 761                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 762                         return EINVAL;
 763                 } else {
 764                         struct sockaddr_in6 *sin6_p;
 765
 766                         sin6_p = (struct sockaddr_in6 *)addr;
 767
 768                         if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 769                                 /* can't bind v4-mapped addrs either! */
 770                                 /* NOTE: we don't support SIIT */
 771                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 772                                 return EINVAL;
 773                         }
 774                 }
 775         }
 776         error = sctp_inpcb_bind(so, addr, NULL, p);
 777         return error;
 778 }
 779
 780
 781 static void
 782 sctp6_close(struct socket *so)
 783 {
 784         sctp_close(so);
 785 }
 786
 787 /* This could be made common with sctp_detach() since they are identical */
 788
 789 static
 790 int
 791 sctp6_disconnect(struct socket *so)
 792 {
 793         return (sctp_disconnect(so));
 794 }
 795
 796
 797 int
 798 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 799     struct mbuf *control, struct thread *p);
 800
 801
 802 static int
 803 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 804     struct mbuf *control, struct thread *p)
 805 {
 806         struct sctp_inpcb *inp;
 807         struct inpcb *in_inp;
 808         struct in6pcb *inp6;
 809
 810 #ifdef INET
 811         struct sockaddr_in6 *sin6;
 812
 813 #endif                          /* INET */
 814         /* No SPL needed since sctp_output does this */
 815
 816         inp = (struct sctp_inpcb *)so->so_pcb;
 817         if (inp == NULL) {
 818                 if (control) {
 819                         SCTP_RELEASE_PKT(control);
 820                         control = NULL;
 821                 }
 822                 SCTP_RELEASE_PKT(m);
 823                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 824                 return EINVAL;
 825         }
 826         in_inp = (struct inpcb *)inp;
 827         inp6 = (struct in6pcb *)inp;
 828         /*
 829          * For the TCP model we may get a NULL addr, if we are a connected
 830          * socket thats ok.
 831          */
 832         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 833             (addr == NULL)) {
 834                 goto connected_type;
 835         }
 836         if (addr == NULL) {
 837                 SCTP_RELEASE_PKT(m);
 838                 if (control) {
 839                         SCTP_RELEASE_PKT(control);
 840                         control = NULL;
 841                 }
 842                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 843                 return (EDESTADDRREQ);
 844         }
 845 #ifdef INET
 846         sin6 = (struct sockaddr_in6 *)addr;
 847         if (SCTP_IPV6_V6ONLY(inp6)) {
 848                 /*
 849                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 850                  * v4 addr or v4-mapped addr
 851                  */
 852                 if (addr->sa_family == AF_INET) {
 853                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 854                         return EINVAL;
 855                 }
 856                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 857                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 858                         return EINVAL;
 859                 }
 860         }
 861         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 862                 if (!MODULE_GLOBAL(ip6_v6only)) {
 863                         struct sockaddr_in sin;
 864
 865                         /* convert v4-mapped into v4 addr and send */
 866                         in6_sin6_2_sin(&sin, sin6);
 867                         return sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 868                             control, p);
 869                 } else {
 870                         /* mapped addresses aren't enabled */
 871                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 872                         return EINVAL;
 873                 }
 874         }
 875 #endif                          /* INET */
 876 connected_type:
 877         /* now what about control */
 878         if (control) {
 879                 if (inp->control) {
 880                         SCTP_PRINTF("huh? control set?\n");
 881                         SCTP_RELEASE_PKT(inp->control);
 882                         inp->control = NULL;
 883                 }
 884                 inp->control = control;
 885         }
 886         /* Place the data */
 887         if (inp->pkt) {
 888                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 889                 inp->pkt_last = m;
 890         } else {
 891                 inp->pkt_last = inp->pkt = m;
 892         }
 893         if (
 894         /* FreeBSD and MacOSX uses a flag passed */
 895             ((flags & PRUS_MORETOCOME) == 0)
 896             ) {
 897                 /*
 898                  * note with the current version this code will only be used
 899                  * by OpenBSD, NetBSD and FreeBSD have methods for
 900                  * re-defining sosend() to use sctp_sosend().  One can
 901                  * optionaly switch back to this code (by changing back the
 902                  * defininitions but this is not advisable.
 903                  */
 904                 int ret;
 905
 906                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 907                 inp->pkt = NULL;
 908                 inp->control = NULL;
 909                 return (ret);
 910         } else {
 911                 return (0);
 912         }
 913 }
 914
 915 static int
 916 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 917 {
 918         uint32_t vrf_id;
 919         int error = 0;
 920         struct sctp_inpcb *inp;
 921         struct in6pcb *inp6;
 922         struct sctp_tcb *stcb;
 923
 924 #ifdef INET
 925         struct sockaddr_in6 *sin6;
 926         struct sockaddr_storage ss;
 927
 928 #endif                          /* INET */
 929
 930         inp6 = (struct in6pcb *)so->so_pcb;
 931         inp = (struct sctp_inpcb *)so->so_pcb;
 932         if (inp == 0) {
 933                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 934                 return (ECONNRESET);    /* I made the same as TCP since we are
 935                                          * not setup? */
 936         }
 937         if (addr == NULL) {
 938                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 939                 return (EINVAL);
 940         }
 941         if ((addr->sa_family == AF_INET6) && (addr->sa_len != sizeof(struct sockaddr_in6))) {
 942                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 943                 return (EINVAL);
 944         }
 945         if ((addr->sa_family == AF_INET) && (addr->sa_len != sizeof(struct sockaddr_in))) {
 946                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 947                 return (EINVAL);
 948         }
 949         vrf_id = inp->def_vrf_id;
 950         SCTP_ASOC_CREATE_LOCK(inp);
 951         SCTP_INP_RLOCK(inp);
 952         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 953             SCTP_PCB_FLAGS_UNBOUND) {
 954                 /* Bind a ephemeral port */
 955                 SCTP_INP_RUNLOCK(inp);
 956                 error = sctp6_bind(so, NULL, p);
 957                 if (error) {
 958                         SCTP_ASOC_CREATE_UNLOCK(inp);
 959
 960                         return (error);
 961                 }
 962                 SCTP_INP_RLOCK(inp);
 963         }
 964         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 965             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 966                 /* We are already connected AND the TCP model */
 967                 SCTP_INP_RUNLOCK(inp);
 968                 SCTP_ASOC_CREATE_UNLOCK(inp);
 969                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 970                 return (EADDRINUSE);
 971         }
 972 #ifdef INET
 973         sin6 = (struct sockaddr_in6 *)addr;
 974         if (SCTP_IPV6_V6ONLY(inp6)) {
 975                 /*
 976                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 977                  * addr or v4-mapped addr
 978                  */
 979                 if (addr->sa_family == AF_INET) {
 980                         SCTP_INP_RUNLOCK(inp);
 981                         SCTP_ASOC_CREATE_UNLOCK(inp);
 982                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 983                         return EINVAL;
 984                 }
 985                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 986                         SCTP_INP_RUNLOCK(inp);
 987                         SCTP_ASOC_CREATE_UNLOCK(inp);
 988                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 989                         return EINVAL;
 990                 }
 991         }
 992         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 993                 if (!MODULE_GLOBAL(ip6_v6only)) {
 994                         /* convert v4-mapped into v4 addr */
 995                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
 996                         addr = (struct sockaddr *)&ss;
 997                 } else {
 998                         /* mapped addresses aren't enabled */
 999                         SCTP_INP_RUNLOCK(inp);
1000                         SCTP_ASOC_CREATE_UNLOCK(inp);
1001                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1002                         return EINVAL;
1003                 }
1004         } else
1005 #endif                          /* INET */
1006                 addr = addr;    /* for true v6 address case */
1007
1008         /* Now do we connect? */
1009         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1010                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1011                 if (stcb) {
1012                         SCTP_TCB_UNLOCK(stcb);
1013                 }
1014                 SCTP_INP_RUNLOCK(inp);
1015         } else {
1016                 SCTP_INP_RUNLOCK(inp);
1017                 SCTP_INP_WLOCK(inp);
1018                 SCTP_INP_INCR_REF(inp);
1019                 SCTP_INP_WUNLOCK(inp);
1020                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
1021                 if (stcb == NULL) {
1022                         SCTP_INP_WLOCK(inp);
1023                         SCTP_INP_DECR_REF(inp);
1024                         SCTP_INP_WUNLOCK(inp);
1025                 }
1026         }
1027
1028         if (stcb != NULL) {
1029                 /* Already have or am bring up an association */
1030                 SCTP_ASOC_CREATE_UNLOCK(inp);
1031                 SCTP_TCB_UNLOCK(stcb);
1032                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
1033                 return (EALREADY);
1034         }
1035         /* We are GOOD to go */
1036         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
1037         SCTP_ASOC_CREATE_UNLOCK(inp);
1038         if (stcb == NULL) {
1039                 /* Gak! no memory */
1040                 return (error);
1041         }
1042         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
1043                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1044                 /* Set the connected flag so we can queue data */
1045                 soisconnecting(so);
1046         }
1047         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
1048         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1049
1050         /* initialize authentication parameters for the assoc */
1051         sctp_initialize_auth_params(inp, stcb);
1052
1053         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
1054         SCTP_TCB_UNLOCK(stcb);
1055         return error;
1056 }
1057
1058 static int
1059 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
1060 {
1061         struct sockaddr_in6 *sin6;
1062         struct sctp_inpcb *inp;
1063         uint32_t vrf_id;
1064         struct sctp_ifa *sctp_ifa;
1065
1066         int error;
1067
1068         /*
1069          * Do the malloc first in case it blocks.
1070          */
1071         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1072         sin6->sin6_family = AF_INET6;
1073         sin6->sin6_len = sizeof(*sin6);
1074
1075         inp = (struct sctp_inpcb *)so->so_pcb;
1076         if (inp == NULL) {
1077                 SCTP_FREE_SONAME(sin6);
1078                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1079                 return ECONNRESET;
1080         }
1081         SCTP_INP_RLOCK(inp);
1082         sin6->sin6_port = inp->sctp_lport;
1083         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1084                 /* For the bound all case you get back 0 */
1085                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1086                         struct sctp_tcb *stcb;
1087                         struct sockaddr_in6 *sin_a6;
1088                         struct sctp_nets *net;
1089                         int fnd;
1090
1091                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1092                         if (stcb == NULL) {
1093                                 goto notConn6;
1094                         }
1095                         fnd = 0;
1096                         sin_a6 = NULL;
1097                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1098                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1099                                 if (sin_a6 == NULL)
1100                                         /* this will make coverity happy */
1101                                         continue;
1102
1103                                 if (sin_a6->sin6_family == AF_INET6) {
1104                                         fnd = 1;
1105                                         break;
1106                                 }
1107                         }
1108                         if ((!fnd) || (sin_a6 == NULL)) {
1109                                 /* punt */
1110                                 goto notConn6;
1111                         }
1112                         vrf_id = inp->def_vrf_id;
1113                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1114                         if (sctp_ifa) {
1115                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1116                         }
1117                 } else {
1118                         /* For the bound all case you get back 0 */
1119         notConn6:
1120                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1121                 }
1122         } else {
1123                 /* Take the first IPv6 address in the list */
1124                 struct sctp_laddr *laddr;
1125                 int fnd = 0;
1126
1127                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1128                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1129                                 struct sockaddr_in6 *sin_a;
1130
1131                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1132                                 sin6->sin6_addr = sin_a->sin6_addr;
1133                                 fnd = 1;
1134                                 break;
1135                         }
1136                 }
1137                 if (!fnd) {
1138                         SCTP_FREE_SONAME(sin6);
1139                         SCTP_INP_RUNLOCK(inp);
1140                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1141                         return ENOENT;
1142                 }
1143         }
1144         SCTP_INP_RUNLOCK(inp);
1145         /* Scoping things for v6 */
1146         if ((error = sa6_recoverscope(sin6)) != 0) {
1147                 SCTP_FREE_SONAME(sin6);
1148                 return (error);
1149         }
1150         (*addr) = (struct sockaddr *)sin6;
1151         return (0);
1152 }
1153
1154 static int
1155 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1156 {
1157         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr;
1158         int fnd;
1159         struct sockaddr_in6 *sin_a6;
1160         struct sctp_inpcb *inp;
1161         struct sctp_tcb *stcb;
1162         struct sctp_nets *net;
1163
1164         int error;
1165
1166         /*
1167          * Do the malloc first in case it blocks.
1168          */
1169         inp = (struct sctp_inpcb *)so->so_pcb;
1170         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) {
1171                 /* UDP type and listeners will drop out here */
1172                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1173                 return (ENOTCONN);
1174         }
1175         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1176         sin6->sin6_family = AF_INET6;
1177         sin6->sin6_len = sizeof(*sin6);
1178
1179         /* We must recapture incase we blocked */
1180         inp = (struct sctp_inpcb *)so->so_pcb;
1181         if (inp == NULL) {
1182                 SCTP_FREE_SONAME(sin6);
1183                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1184                 return ECONNRESET;
1185         }
1186         SCTP_INP_RLOCK(inp);
1187         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1188         if (stcb) {
1189                 SCTP_TCB_LOCK(stcb);
1190         }
1191         SCTP_INP_RUNLOCK(inp);
1192         if (stcb == NULL) {
1193                 SCTP_FREE_SONAME(sin6);
1194                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1195                 return ECONNRESET;
1196         }
1197         fnd = 0;
1198         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1199                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1200                 if (sin_a6->sin6_family == AF_INET6) {
1201                         fnd = 1;
1202                         sin6->sin6_port = stcb->rport;
1203                         sin6->sin6_addr = sin_a6->sin6_addr;
1204                         break;
1205                 }
1206         }
1207         SCTP_TCB_UNLOCK(stcb);
1208         if (!fnd) {
1209                 /* No IPv4 address */
1210                 SCTP_FREE_SONAME(sin6);
1211                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1212                 return ENOENT;
1213         }
1214         if ((error = sa6_recoverscope(sin6)) != 0)
1215                 return (error);
1216         *addr = (struct sockaddr *)sin6;
1217         return (0);
1218 }
1219
1220 static int
1221 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1222 {
1223         struct sockaddr *addr;
1224         struct in6pcb *inp6 = sotoin6pcb(so);
1225         int error;
1226
1227         if (inp6 == NULL) {
1228                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1229                 return EINVAL;
1230         }
1231         /* allow v6 addresses precedence */
1232         error = sctp6_getaddr(so, nam);
1233         if (error) {
1234                 /* try v4 next if v6 failed */
1235                 error = sctp_ingetaddr(so, nam);
1236                 if (error) {
1237                         return (error);
1238                 }
1239                 addr = *nam;
1240                 /* if I'm V6ONLY, convert it to v4-mapped */
1241                 if (SCTP_IPV6_V6ONLY(inp6)) {
1242                         struct sockaddr_in6 sin6;
1243
1244                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1245                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1246
1247                 }
1248         }
1249         return (error);
1250 }
1251
1252
1253 static int
1254 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1255 {
1256         struct sockaddr *addr = *nam;
1257         struct in6pcb *inp6 = sotoin6pcb(so);
1258         int error;
1259
1260         if (inp6 == NULL) {
1261                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1262                 return EINVAL;
1263         }
1264         /* allow v6 addresses precedence */
1265         error = sctp6_peeraddr(so, nam);
1266         if (error) {
1267                 /* try v4 next if v6 failed */
1268                 error = sctp_peeraddr(so, nam);
1269                 if (error) {
1270                         return (error);
1271                 }
1272                 /* if I'm V6ONLY, convert it to v4-mapped */
1273                 if (SCTP_IPV6_V6ONLY(inp6)) {
1274                         struct sockaddr_in6 sin6;
1275
1276                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1277                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1278                 }
1279         }
1280         return error;
1281 }
1282
1283 struct pr_usrreqs sctp6_usrreqs = {
1284         .pru_abort = sctp6_abort,
1285         .pru_accept = sctp_accept,
1286         .pru_attach = sctp6_attach,
1287         .pru_bind = sctp6_bind,
1288         .pru_connect = sctp6_connect,
1289         .pru_control = in6_control,
1290         .pru_close = sctp6_close,
1291         .pru_detach = sctp6_close,
1292         .pru_sopoll = sopoll_generic,
1293         .pru_flush = sctp_flush,
1294         .pru_disconnect = sctp6_disconnect,
1295         .pru_listen = sctp_listen,
1296         .pru_peeraddr = sctp6_getpeeraddr,
1297         .pru_send = sctp6_send,
1298         .pru_shutdown = sctp_shutdown,
1299         .pru_sockaddr = sctp6_in6getaddr,
1300         .pru_sosend = sctp_sosend,
1301         .pru_soreceive = sctp_soreceive
1302 };