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/udp.h>
  55
  56 #ifdef IPSEC
  57 #include <netipsec/ipsec.h>
  58 #if defined(INET6)
  59 #include <netipsec/ipsec6.h>
  60 #endif                          /* INET6 */
  61 #endif                          /* IPSEC */
  62
  63 extern struct protosw inetsw[];
  64
  65 int
  66 sctp6_input(struct mbuf **i_pak, int *offp, int proto)
  67 {
  68         struct mbuf *m;
  69         struct ip6_hdr *ip6;
  70         struct sctphdr *sh;
  71         struct sctp_inpcb *in6p = NULL;
  72         struct sctp_nets *net;
  73         int refcount_up = 0;
  74         uint32_t check, calc_check;
  75         uint32_t vrf_id = 0;
  76         struct inpcb *in6p_ip;
  77         struct sctp_chunkhdr *ch;
  78         int length, mlen, offset, iphlen;
  79         uint8_t ecn_bits;
  80         struct sctp_tcb *stcb = NULL;
  81         int pkt_len = 0;
  82         int off = *offp;
  83         uint16_t port = 0;
  84
  85         /* get the VRF and table id's */
  86         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  87                 SCTP_RELEASE_PKT(*i_pak);
  88                 return (-1);
  89         }
  90         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  91         pkt_len = SCTP_HEADER_LEN((*i_pak));
  92
  93 #ifdef  SCTP_PACKET_LOGGING
  94         sctp_packet_log(m, pkt_len);
  95 #endif
  96         ip6 = mtod(m, struct ip6_hdr *);
  97         /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
  98         IP6_EXTHDR_GET(sh, struct sctphdr *, m, off,
  99             (int)(sizeof(*sh) + sizeof(*ch)));
 100         if (sh == NULL) {
 101                 SCTP_STAT_INCR(sctps_hdrops);
 102                 return IPPROTO_DONE;
 103         }
 104         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 105         iphlen = off;
 106         offset = iphlen + sizeof(*sh) + sizeof(*ch);
 107         SCTPDBG(SCTP_DEBUG_INPUT1,
 108             "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen);
 109
 110
 111 #if defined(NFAITH) && NFAITH > 0
 112
 113         if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
 114                 /* XXX send icmp6 host/port unreach? */
 115                 goto bad;
 116         }
 117 #endif                          /* NFAITH defined and > 0 */
 118         SCTP_STAT_INCR(sctps_recvpackets);
 119         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 120         SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n",
 121             iphlen, pkt_len);
 122         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 123                 /* No multi-cast support in SCTP */
 124                 goto bad;
 125         }
 126         /* destination port of 0 is illegal, based on RFC2960. */
 127         if (sh->dest_port == 0)
 128                 goto bad;
 129         check = sh->checksum;   /* save incoming checksum */
 130         if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) &&
 131             (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) {
 132                 goto sctp_skip_csum;
 133         }
 134         sh->checksum = 0;       /* prepare for calc */
 135         calc_check = sctp_calculate_sum(m, &mlen, iphlen);
 136         if (calc_check != check) {
 137                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
 138                     calc_check, check, m, mlen, iphlen);
 139                 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 140                     sh, ch, &in6p, &net, vrf_id);
 141                 if ((net) && (port)) {
 142                         if (net->port == 0) {
 143                                 sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 144                         }
 145                         net->port = port;
 146                 }
 147                 /* in6p's ref-count increased && stcb locked */
 148                 if ((in6p) && (stcb)) {
 149                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
 150                         sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 151                 } else if ((in6p != NULL) && (stcb == NULL)) {
 152                         refcount_up = 1;
 153                 }
 154                 SCTP_STAT_INCR(sctps_badsum);
 155                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 156                 goto bad;
 157         }
 158         sh->checksum = calc_check;
 159
 160 sctp_skip_csum:
 161         net = NULL;
 162         /*
 163          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
 164          * IP/SCTP/first chunk header...
 165          */
 166         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 167             sh, ch, &in6p, &net, vrf_id);
 168         if ((net) && (port)) {
 169                 if (net->port == 0) {
 170                         sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 171                 }
 172                 net->port = port;
 173         }
 174         /* in6p's ref-count increased */
 175         if (in6p == NULL) {
 176                 struct sctp_init_chunk *init_chk, chunk_buf;
 177
 178                 SCTP_STAT_INCR(sctps_noport);
 179                 if (ch->chunk_type == SCTP_INITIATION) {
 180                         /*
 181                          * we do a trick here to get the INIT tag, dig in
 182                          * and get the tag from the INIT and put it in the
 183                          * common header.
 184                          */
 185                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
 186                             iphlen + sizeof(*sh), sizeof(*init_chk),
 187                             (uint8_t *) & chunk_buf);
 188                         if (init_chk)
 189                                 sh->v_tag = init_chk->init.initiate_tag;
 190                         else
 191                                 sh->v_tag = 0;
 192                 }
 193                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 194                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
 195                         goto bad;
 196                 }
 197                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 198                         goto bad;
 199                 }
 200                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
 201                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
 202                 goto bad;
 203         } else if (stcb == NULL) {
 204                 refcount_up = 1;
 205         }
 206         in6p_ip = (struct inpcb *)in6p;
 207 #ifdef IPSEC
 208         /*
 209          * Check AH/ESP integrity.
 210          */
 211         if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) {
 212 /* XXX */
 213                 MODULE_GLOBAL(MOD_IPSEC, ipsec6stat).in_polvio++;
 214                 goto bad;
 215         }
 216 #endif                          /* IPSEC */
 217
 218         /*
 219          * CONTROL chunk processing
 220          */
 221         offset -= sizeof(*ch);
 222         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 223
 224         /* Length now holds the total packet length payload + iphlen */
 225         length = ntohs(ip6->ip6_plen) + iphlen;
 226
 227         /* sa_ignore NO_NULL_CHK */
 228         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
 229             in6p, stcb, net, ecn_bits, vrf_id, port);
 230         /* inp's ref-count reduced && stcb unlocked */
 231         /* XXX this stuff below gets moved to appropriate parts later... */
 232         if (m)
 233                 sctp_m_freem(m);
 234         if ((in6p) && refcount_up) {
 235                 /* reduce ref-count */
 236                 SCTP_INP_WLOCK(in6p);
 237                 SCTP_INP_DECR_REF(in6p);
 238                 SCTP_INP_WUNLOCK(in6p);
 239         }
 240         return IPPROTO_DONE;
 241
 242 bad:
 243         if (stcb) {
 244                 SCTP_TCB_UNLOCK(stcb);
 245         }
 246         if ((in6p) && refcount_up) {
 247                 /* reduce ref-count */
 248                 SCTP_INP_WLOCK(in6p);
 249                 SCTP_INP_DECR_REF(in6p);
 250                 SCTP_INP_WUNLOCK(in6p);
 251         }
 252         if (m)
 253                 sctp_m_freem(m);
 254         return IPPROTO_DONE;
 255 }
 256
 257
 258 static void
 259 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 260     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 261 {
 262         uint32_t nxtsz;
 263
 264         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 265             (icmp6 == NULL) || (sh == NULL)) {
 266                 goto out;
 267         }
 268         /* First do we even look at it? */
 269         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 270                 goto out;
 271
 272         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 273                 /* not PACKET TO BIG */
 274                 goto out;
 275         }
 276         /*
 277          * ok we need to look closely. We could even get smarter and look at
 278          * anyone that we sent to in case we get a different ICMP that tells
 279          * us there is no way to reach a host, but for this impl, all we
 280          * care about is MTU discovery.
 281          */
 282         nxtsz = ntohl(icmp6->icmp6_mtu);
 283         /* Stop any PMTU timer */
 284         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 285
 286         /* Adjust destination size limit */
 287         if (net->mtu > nxtsz) {
 288                 net->mtu = nxtsz;
 289         }
 290         /* now what about the ep? */
 291         if (stcb->asoc.smallest_mtu > nxtsz) {
 292                 struct sctp_tmit_chunk *chk;
 293
 294                 /* Adjust that too */
 295                 stcb->asoc.smallest_mtu = nxtsz;
 296                 /* now off to subtract IP_DF flag if needed */
 297
 298                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 299                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 300                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 301                         }
 302                 }
 303                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 304                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 305                                 /*
 306                                  * For this guy we also mark for immediate
 307                                  * resend since we sent to big of chunk
 308                                  */
 309                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 310                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 311                                         stcb->asoc.sent_queue_retran_cnt++;
 312                                 chk->sent = SCTP_DATAGRAM_RESEND;
 313                                 chk->rec.data.doing_fast_retransmit = 0;
 314
 315                                 chk->sent = SCTP_DATAGRAM_RESEND;
 316                                 /* Clear any time so NO RTT is being done */
 317                                 chk->sent_rcv_time.tv_sec = 0;
 318                                 chk->sent_rcv_time.tv_usec = 0;
 319                                 stcb->asoc.total_flight -= chk->send_size;
 320                                 net->flight_size -= chk->send_size;
 321                         }
 322                 }
 323         }
 324         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 325 out:
 326         if (stcb) {
 327                 SCTP_TCB_UNLOCK(stcb);
 328         }
 329 }
 330
 331
 332 void
 333 sctp6_notify(struct sctp_inpcb *inp,
 334     struct icmp6_hdr *icmph,
 335     struct sctphdr *sh,
 336     struct sockaddr *to,
 337     struct sctp_tcb *stcb,
 338     struct sctp_nets *net)
 339 {
 340 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 341         struct socket *so;
 342
 343 #endif
 344         /* protection */
 345         int reason;
 346
 347
 348         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 349             (sh == NULL) || (to == NULL)) {
 350                 if (stcb)
 351                         SCTP_TCB_UNLOCK(stcb);
 352                 return;
 353         }
 354         /* First job is to verify the vtag matches what I would send */
 355         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 356                 SCTP_TCB_UNLOCK(stcb);
 357                 return;
 358         }
 359         if (icmph->icmp6_type != ICMP_UNREACH) {
 360                 /* We only care about unreachable */
 361                 SCTP_TCB_UNLOCK(stcb);
 362                 return;
 363         }
 364         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 365             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 366             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 367             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 368             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 369             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 370             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 371             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 372
 373                 /*
 374                  * Hmm reachablity problems we must examine closely. If its
 375                  * not reachable, we may have lost a network. Or if there is
 376                  * NO protocol at the other end named SCTP. well we consider
 377                  * it a OOTB abort.
 378                  */
 379                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 380                         /* Ok that destination is NOT reachable */
 381                         SCTP_PRINTF("ICMP (thresh %d/%d) takes interface %p down\n",
 382                             net->error_count,
 383                             net->failure_threshold,
 384                             net);
 385
 386                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 387                         net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
 388                         /*
 389                          * JRS 5/14/07 - If a destination is unreachable,
 390                          * the PF bit is turned off.  This allows an
 391                          * unambiguous use of the PF bit for destinations
 392                          * that are reachable but potentially failed. If the
 393                          * destination is set to the unreachable state, also
 394                          * set the destination to the PF state.
 395                          */
 396                         /*
 397                          * Add debug message here if destination is not in
 398                          * PF state.
 399                          */
 400                         /* Stop any running T3 timers here? */
 401                         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
 402                                 net->dest_state &= ~SCTP_ADDR_PF;
 403                                 SCTPDBG(SCTP_DEBUG_TIMER4, "Destination %p moved from PF to unreachable.\n",
 404                                     net);
 405                         }
 406                         net->error_count = net->failure_threshold + 1;
 407                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 408                             stcb, SCTP_FAILED_THRESHOLD,
 409                             (void *)net, SCTP_SO_NOT_LOCKED);
 410                 }
 411                 SCTP_TCB_UNLOCK(stcb);
 412         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 413             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 414                 /*
 415                  * Here the peer is either playing tricks on us, including
 416                  * an address that belongs to someone who does not support
 417                  * SCTP OR was a userland implementation that shutdown and
 418                  * now is dead. In either case treat it like a OOTB abort
 419                  * with no TCB
 420                  */
 421                 reason = SCTP_PEER_FAULTY;
 422                 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED);
 423 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 424                 so = SCTP_INP_SO(inp);
 425                 atomic_add_int(&stcb->asoc.refcnt, 1);
 426                 SCTP_TCB_UNLOCK(stcb);
 427                 SCTP_SOCKET_LOCK(so, 1);
 428                 SCTP_TCB_LOCK(stcb);
 429                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 430 #endif
 431                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 432 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 433                 SCTP_SOCKET_UNLOCK(so, 1);
 434                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 435 #endif
 436                 /* no need to unlock here, since the TCB is gone */
 437         } else {
 438                 SCTP_TCB_UNLOCK(stcb);
 439         }
 440 }
 441
 442
 443
 444 void
 445 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 446 {
 447         struct sctphdr sh;
 448         struct ip6ctlparam *ip6cp = NULL;
 449         uint32_t vrf_id;
 450
 451         vrf_id = SCTP_DEFAULT_VRFID;
 452
 453         if (pktdst->sa_family != AF_INET6 ||
 454             pktdst->sa_len != sizeof(struct sockaddr_in6))
 455                 return;
 456
 457         if ((unsigned)cmd >= PRC_NCMDS)
 458                 return;
 459         if (PRC_IS_REDIRECT(cmd)) {
 460                 d = NULL;
 461         } else if (inet6ctlerrmap[cmd] == 0) {
 462                 return;
 463         }
 464         /* if the parameter is from icmp6, decode it. */
 465         if (d != NULL) {
 466                 ip6cp = (struct ip6ctlparam *)d;
 467         } else {
 468                 ip6cp = (struct ip6ctlparam *)NULL;
 469         }
 470
 471         if (ip6cp) {
 472                 /*
 473                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 474                  * valid.
 475                  */
 476                 /* check if we can safely examine src and dst ports */
 477                 struct sctp_inpcb *inp = NULL;
 478                 struct sctp_tcb *stcb = NULL;
 479                 struct sctp_nets *net = NULL;
 480                 struct sockaddr_in6 final;
 481
 482                 if (ip6cp->ip6c_m == NULL)
 483                         return;
 484
 485                 bzero(&sh, sizeof(sh));
 486                 bzero(&final, sizeof(final));
 487                 inp = NULL;
 488                 net = NULL;
 489                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 490                     (caddr_t)&sh);
 491                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 492                 final.sin6_len = sizeof(final);
 493                 final.sin6_family = AF_INET6;
 494                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 495                 final.sin6_port = sh.dest_port;
 496                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
 497                     (struct sockaddr *)&final,
 498                     &inp, &net, 1, vrf_id);
 499                 /* inp's ref-count increased && stcb locked */
 500                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 501                         if (cmd == PRC_MSGSIZE) {
 502                                 sctp6_notify_mbuf(inp,
 503                                     ip6cp->ip6c_icmp6,
 504                                     &sh,
 505                                     stcb,
 506                                     net);
 507                                 /* inp's ref-count reduced && stcb unlocked */
 508                         } else {
 509                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 510                                     (struct sockaddr *)&final,
 511                                     stcb, net);
 512                                 /* inp's ref-count reduced && stcb unlocked */
 513                         }
 514                 } else {
 515                         if (PRC_IS_REDIRECT(cmd) && inp) {
 516                                 in6_rtchange((struct in6pcb *)inp,
 517                                     inet6ctlerrmap[cmd]);
 518                         }
 519                         if (inp) {
 520                                 /* reduce inp's ref-count */
 521                                 SCTP_INP_WLOCK(inp);
 522                                 SCTP_INP_DECR_REF(inp);
 523                                 SCTP_INP_WUNLOCK(inp);
 524                         }
 525                         if (stcb)
 526                                 SCTP_TCB_UNLOCK(stcb);
 527                 }
 528         }
 529 }
 530
 531 /*
 532  * this routine can probably be collasped into the one in sctp_userreq.c
 533  * since they do the same thing and now we lookup with a sockaddr
 534  */
 535 static int
 536 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 537 {
 538         struct xucred xuc;
 539         struct sockaddr_in6 addrs[2];
 540         struct sctp_inpcb *inp;
 541         struct sctp_nets *net;
 542         struct sctp_tcb *stcb;
 543         int error;
 544         uint32_t vrf_id;
 545
 546         vrf_id = SCTP_DEFAULT_VRFID;
 547
 548         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 549         if (error)
 550                 return (error);
 551
 552         if (req->newlen != sizeof(addrs)) {
 553                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 554                 return (EINVAL);
 555         }
 556         if (req->oldlen != sizeof(struct ucred)) {
 557                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 558                 return (EINVAL);
 559         }
 560         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 561         if (error)
 562                 return (error);
 563
 564         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
 565             sin6tosa(&addrs[1]),
 566             &inp, &net, 1, vrf_id);
 567         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 568                 if ((inp != NULL) && (stcb == NULL)) {
 569                         /* reduce ref-count */
 570                         SCTP_INP_WLOCK(inp);
 571                         SCTP_INP_DECR_REF(inp);
 572                         goto cred_can_cont;
 573                 }
 574                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 575                 error = ENOENT;
 576                 goto out;
 577         }
 578         SCTP_TCB_UNLOCK(stcb);
 579         /*
 580          * We use the write lock here, only since in the error leg we need
 581          * it. If we used RLOCK, then we would have to
 582          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 583          * Better to use higher wlock.
 584          */
 585         SCTP_INP_WLOCK(inp);
 586 cred_can_cont:
 587         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 588         if (error) {
 589                 SCTP_INP_WUNLOCK(inp);
 590                 goto out;
 591         }
 592         cru2x(inp->sctp_socket->so_cred, &xuc);
 593         SCTP_INP_WUNLOCK(inp);
 594         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 595 out:
 596         return (error);
 597 }
 598
 599 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 600     0, 0,
 601     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 602
 603
 604 /* This is the same as the sctp_abort() could be made common */
 605 static void
 606 sctp6_abort(struct socket *so)
 607 {
 608         struct sctp_inpcb *inp;
 609         uint32_t flags;
 610
 611         inp = (struct sctp_inpcb *)so->so_pcb;
 612         if (inp == 0) {
 613                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 614                 return;
 615         }
 616 sctp_must_try_again:
 617         flags = inp->sctp_flags;
 618 #ifdef SCTP_LOG_CLOSING
 619         sctp_log_closing(inp, NULL, 17);
 620 #endif
 621         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 622             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 623 #ifdef SCTP_LOG_CLOSING
 624                 sctp_log_closing(inp, NULL, 16);
 625 #endif
 626                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 627                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 628                 SOCK_LOCK(so);
 629                 SCTP_SB_CLEAR(so->so_snd);
 630                 /*
 631                  * same for the rcv ones, they are only here for the
 632                  * accounting/select.
 633                  */
 634                 SCTP_SB_CLEAR(so->so_rcv);
 635                 /* Now null out the reference, we are completely detached. */
 636                 so->so_pcb = NULL;
 637                 SOCK_UNLOCK(so);
 638         } else {
 639                 flags = inp->sctp_flags;
 640                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 641                         goto sctp_must_try_again;
 642                 }
 643         }
 644         return;
 645 }
 646
 647 static int
 648 sctp6_attach(struct socket *so, int proto, struct thread *p)
 649 {
 650         struct in6pcb *inp6;
 651         int error;
 652         struct sctp_inpcb *inp;
 653         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 654
 655         inp = (struct sctp_inpcb *)so->so_pcb;
 656         if (inp != NULL) {
 657                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 658                 return EINVAL;
 659         }
 660         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 661                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 662                 if (error)
 663                         return error;
 664         }
 665         error = sctp_inpcb_alloc(so, vrf_id);
 666         if (error)
 667                 return error;
 668         inp = (struct sctp_inpcb *)so->so_pcb;
 669         SCTP_INP_WLOCK(inp);
 670         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 671         inp6 = (struct in6pcb *)inp;
 672
 673         inp6->inp_vflag |= INP_IPV6;
 674         inp6->in6p_hops = -1;   /* use kernel default */
 675         inp6->in6p_cksum = -1;  /* just to be sure */
 676 #ifdef INET
 677         /*
 678          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 679          * socket as well, because the socket may be bound to an IPv6
 680          * wildcard address, which may match an IPv4-mapped IPv6 address.
 681          */
 682         inp6->inp_ip_ttl = MODULE_GLOBAL(MOD_INET, ip_defttl);
 683 #endif
 684         /*
 685          * Hmm what about the IPSEC stuff that is missing here but in
 686          * sctp_attach()?
 687          */
 688         SCTP_INP_WUNLOCK(inp);
 689         return 0;
 690 }
 691
 692 static int
 693 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 694 {
 695         struct sctp_inpcb *inp;
 696         struct in6pcb *inp6;
 697         int error;
 698
 699         inp = (struct sctp_inpcb *)so->so_pcb;
 700         if (inp == 0) {
 701                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 702                 return EINVAL;
 703         }
 704         if (addr) {
 705                 if ((addr->sa_family == AF_INET6) &&
 706                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
 707                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 708                         return EINVAL;
 709                 }
 710                 if ((addr->sa_family == AF_INET) &&
 711                     (addr->sa_len != sizeof(struct sockaddr_in))) {
 712                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 713                         return EINVAL;
 714                 }
 715         }
 716         inp6 = (struct in6pcb *)inp;
 717         inp6->inp_vflag &= ~INP_IPV4;
 718         inp6->inp_vflag |= INP_IPV6;
 719         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 720                 if (addr->sa_family == AF_INET) {
 721                         /* binding v4 addr to v6 socket, so reset flags */
 722                         inp6->inp_vflag |= INP_IPV4;
 723                         inp6->inp_vflag &= ~INP_IPV6;
 724                 } else {
 725                         struct sockaddr_in6 *sin6_p;
 726
 727                         sin6_p = (struct sockaddr_in6 *)addr;
 728
 729                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 730                                 inp6->inp_vflag |= INP_IPV4;
 731                         } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 732                                 struct sockaddr_in sin;
 733
 734                                 in6_sin6_2_sin(&sin, sin6_p);
 735                                 inp6->inp_vflag |= INP_IPV4;
 736                                 inp6->inp_vflag &= ~INP_IPV6;
 737                                 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 738                                 return error;
 739                         }
 740                 }
 741         } else if (addr != NULL) {
 742                 /* IPV6_V6ONLY socket */
 743                 if (addr->sa_family == AF_INET) {
 744                         /* can't bind v4 addr to v6 only socket! */
 745                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 746                         return EINVAL;
 747                 } else {
 748                         struct sockaddr_in6 *sin6_p;
 749
 750                         sin6_p = (struct sockaddr_in6 *)addr;
 751
 752                         if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 753                                 /* can't bind v4-mapped addrs either! */
 754                                 /* NOTE: we don't support SIIT */
 755                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 756                                 return EINVAL;
 757                         }
 758                 }
 759         }
 760         error = sctp_inpcb_bind(so, addr, NULL, p);
 761         return error;
 762 }
 763
 764
 765 static void
 766 sctp6_close(struct socket *so)
 767 {
 768         sctp_close(so);
 769 }
 770
 771 /* This could be made common with sctp_detach() since they are identical */
 772
 773 static
 774 int
 775 sctp6_disconnect(struct socket *so)
 776 {
 777         return (sctp_disconnect(so));
 778 }
 779
 780
 781 int
 782 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 783     struct mbuf *control, struct thread *p);
 784
 785
 786 static int
 787 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 788     struct mbuf *control, struct thread *p)
 789 {
 790         struct sctp_inpcb *inp;
 791         struct inpcb *in_inp;
 792         struct in6pcb *inp6;
 793
 794 #ifdef INET
 795         struct sockaddr_in6 *sin6;
 796
 797 #endif                          /* INET */
 798         /* No SPL needed since sctp_output does this */
 799
 800         inp = (struct sctp_inpcb *)so->so_pcb;
 801         if (inp == NULL) {
 802                 if (control) {
 803                         SCTP_RELEASE_PKT(control);
 804                         control = NULL;
 805                 }
 806                 SCTP_RELEASE_PKT(m);
 807                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 808                 return EINVAL;
 809         }
 810         in_inp = (struct inpcb *)inp;
 811         inp6 = (struct in6pcb *)inp;
 812         /*
 813          * For the TCP model we may get a NULL addr, if we are a connected
 814          * socket thats ok.
 815          */
 816         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 817             (addr == NULL)) {
 818                 goto connected_type;
 819         }
 820         if (addr == NULL) {
 821                 SCTP_RELEASE_PKT(m);
 822                 if (control) {
 823                         SCTP_RELEASE_PKT(control);
 824                         control = NULL;
 825                 }
 826                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 827                 return (EDESTADDRREQ);
 828         }
 829 #ifdef INET
 830         sin6 = (struct sockaddr_in6 *)addr;
 831         if (SCTP_IPV6_V6ONLY(inp6)) {
 832                 /*
 833                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 834                  * v4 addr or v4-mapped addr
 835                  */
 836                 if (addr->sa_family == AF_INET) {
 837                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 838                         return EINVAL;
 839                 }
 840                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 841                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 842                         return EINVAL;
 843                 }
 844         }
 845         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 846                 if (!MODULE_GLOBAL(MOD_INET6, ip6_v6only)) {
 847                         struct sockaddr_in sin;
 848
 849                         /* convert v4-mapped into v4 addr and send */
 850                         in6_sin6_2_sin(&sin, sin6);
 851                         return sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 852                             control, p);
 853                 } else {
 854                         /* mapped addresses aren't enabled */
 855                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 856                         return EINVAL;
 857                 }
 858         }
 859 #endif                          /* INET */
 860 connected_type:
 861         /* now what about control */
 862         if (control) {
 863                 if (inp->control) {
 864                         SCTP_PRINTF("huh? control set?\n");
 865                         SCTP_RELEASE_PKT(inp->control);
 866                         inp->control = NULL;
 867                 }
 868                 inp->control = control;
 869         }
 870         /* Place the data */
 871         if (inp->pkt) {
 872                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 873                 inp->pkt_last = m;
 874         } else {
 875                 inp->pkt_last = inp->pkt = m;
 876         }
 877         if (
 878         /* FreeBSD and MacOSX uses a flag passed */
 879             ((flags & PRUS_MORETOCOME) == 0)
 880             ) {
 881                 /*
 882                  * note with the current version this code will only be used
 883                  * by OpenBSD, NetBSD and FreeBSD have methods for
 884                  * re-defining sosend() to use sctp_sosend().  One can
 885                  * optionaly switch back to this code (by changing back the
 886                  * defininitions but this is not advisable.
 887                  */
 888                 int ret;
 889
 890                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 891                 inp->pkt = NULL;
 892                 inp->control = NULL;
 893                 return (ret);
 894         } else {
 895                 return (0);
 896         }
 897 }
 898
 899 static int
 900 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 901 {
 902         uint32_t vrf_id;
 903         int error = 0;
 904         struct sctp_inpcb *inp;
 905         struct in6pcb *inp6;
 906         struct sctp_tcb *stcb;
 907
 908 #ifdef INET
 909         struct sockaddr_in6 *sin6;
 910         struct sockaddr_storage ss;
 911
 912 #endif                          /* INET */
 913
 914         inp6 = (struct in6pcb *)so->so_pcb;
 915         inp = (struct sctp_inpcb *)so->so_pcb;
 916         if (inp == 0) {
 917                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 918                 return (ECONNRESET);    /* I made the same as TCP since we are
 919                                          * not setup? */
 920         }
 921         if (addr == NULL) {
 922                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 923                 return (EINVAL);
 924         }
 925         if ((addr->sa_family == AF_INET6) && (addr->sa_len != sizeof(struct sockaddr_in6))) {
 926                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 927                 return (EINVAL);
 928         }
 929         if ((addr->sa_family == AF_INET) && (addr->sa_len != sizeof(struct sockaddr_in))) {
 930                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 931                 return (EINVAL);
 932         }
 933         vrf_id = inp->def_vrf_id;
 934         SCTP_ASOC_CREATE_LOCK(inp);
 935         SCTP_INP_RLOCK(inp);
 936         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 937             SCTP_PCB_FLAGS_UNBOUND) {
 938                 /* Bind a ephemeral port */
 939                 SCTP_INP_RUNLOCK(inp);
 940                 error = sctp6_bind(so, NULL, p);
 941                 if (error) {
 942                         SCTP_ASOC_CREATE_UNLOCK(inp);
 943
 944                         return (error);
 945                 }
 946                 SCTP_INP_RLOCK(inp);
 947         }
 948         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 949             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 950                 /* We are already connected AND the TCP model */
 951                 SCTP_INP_RUNLOCK(inp);
 952                 SCTP_ASOC_CREATE_UNLOCK(inp);
 953                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 954                 return (EADDRINUSE);
 955         }
 956 #ifdef INET
 957         sin6 = (struct sockaddr_in6 *)addr;
 958         if (SCTP_IPV6_V6ONLY(inp6)) {
 959                 /*
 960                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 961                  * addr or v4-mapped addr
 962                  */
 963                 if (addr->sa_family == AF_INET) {
 964                         SCTP_INP_RUNLOCK(inp);
 965                         SCTP_ASOC_CREATE_UNLOCK(inp);
 966                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 967                         return EINVAL;
 968                 }
 969                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 970                         SCTP_INP_RUNLOCK(inp);
 971                         SCTP_ASOC_CREATE_UNLOCK(inp);
 972                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 973                         return EINVAL;
 974                 }
 975         }
 976         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 977                 if (!MODULE_GLOBAL(MOD_INET6, ip6_v6only)) {
 978                         /* convert v4-mapped into v4 addr */
 979                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
 980                         addr = (struct sockaddr *)&ss;
 981                 } else {
 982                         /* mapped addresses aren't enabled */
 983                         SCTP_INP_RUNLOCK(inp);
 984                         SCTP_ASOC_CREATE_UNLOCK(inp);
 985                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 986                         return EINVAL;
 987                 }
 988         } else
 989 #endif                          /* INET */
 990                 addr = addr;    /* for true v6 address case */
 991
 992         /* Now do we connect? */
 993         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 994                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 995                 if (stcb) {
 996                         SCTP_TCB_UNLOCK(stcb);
 997                 }
 998                 SCTP_INP_RUNLOCK(inp);
 999         } else {
1000                 SCTP_INP_RUNLOCK(inp);
1001                 SCTP_INP_WLOCK(inp);
1002                 SCTP_INP_INCR_REF(inp);
1003                 SCTP_INP_WUNLOCK(inp);
1004                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
1005                 if (stcb == NULL) {
1006                         SCTP_INP_WLOCK(inp);
1007                         SCTP_INP_DECR_REF(inp);
1008                         SCTP_INP_WUNLOCK(inp);
1009                 }
1010         }
1011
1012         if (stcb != NULL) {
1013                 /* Already have or am bring up an association */
1014                 SCTP_ASOC_CREATE_UNLOCK(inp);
1015                 SCTP_TCB_UNLOCK(stcb);
1016                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
1017                 return (EALREADY);
1018         }
1019         /* We are GOOD to go */
1020         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id, p);
1021         SCTP_ASOC_CREATE_UNLOCK(inp);
1022         if (stcb == NULL) {
1023                 /* Gak! no memory */
1024                 return (error);
1025         }
1026         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
1027                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1028                 /* Set the connected flag so we can queue data */
1029                 soisconnecting(so);
1030         }
1031         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
1032         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1033
1034         /* initialize authentication parameters for the assoc */
1035         sctp_initialize_auth_params(inp, stcb);
1036
1037         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
1038         SCTP_TCB_UNLOCK(stcb);
1039         return error;
1040 }
1041
1042 static int
1043 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
1044 {
1045         struct sockaddr_in6 *sin6;
1046         struct sctp_inpcb *inp;
1047         uint32_t vrf_id;
1048         struct sctp_ifa *sctp_ifa;
1049
1050         int error;
1051
1052         /*
1053          * Do the malloc first in case it blocks.
1054          */
1055         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1056         sin6->sin6_family = AF_INET6;
1057         sin6->sin6_len = sizeof(*sin6);
1058
1059         inp = (struct sctp_inpcb *)so->so_pcb;
1060         if (inp == NULL) {
1061                 SCTP_FREE_SONAME(sin6);
1062                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1063                 return ECONNRESET;
1064         }
1065         SCTP_INP_RLOCK(inp);
1066         sin6->sin6_port = inp->sctp_lport;
1067         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1068                 /* For the bound all case you get back 0 */
1069                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1070                         struct sctp_tcb *stcb;
1071                         struct sockaddr_in6 *sin_a6;
1072                         struct sctp_nets *net;
1073                         int fnd;
1074
1075                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1076                         if (stcb == NULL) {
1077                                 goto notConn6;
1078                         }
1079                         fnd = 0;
1080                         sin_a6 = NULL;
1081                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1082                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1083                                 if (sin_a6 == NULL)
1084                                         /* this will make coverity happy */
1085                                         continue;
1086
1087                                 if (sin_a6->sin6_family == AF_INET6) {
1088                                         fnd = 1;
1089                                         break;
1090                                 }
1091                         }
1092                         if ((!fnd) || (sin_a6 == NULL)) {
1093                                 /* punt */
1094                                 goto notConn6;
1095                         }
1096                         vrf_id = inp->def_vrf_id;
1097                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1098                         if (sctp_ifa) {
1099                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1100                         }
1101                 } else {
1102                         /* For the bound all case you get back 0 */
1103         notConn6:
1104                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1105                 }
1106         } else {
1107                 /* Take the first IPv6 address in the list */
1108                 struct sctp_laddr *laddr;
1109                 int fnd = 0;
1110
1111                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1112                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1113                                 struct sockaddr_in6 *sin_a;
1114
1115                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1116                                 sin6->sin6_addr = sin_a->sin6_addr;
1117                                 fnd = 1;
1118                                 break;
1119                         }
1120                 }
1121                 if (!fnd) {
1122                         SCTP_FREE_SONAME(sin6);
1123                         SCTP_INP_RUNLOCK(inp);
1124                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1125                         return ENOENT;
1126                 }
1127         }
1128         SCTP_INP_RUNLOCK(inp);
1129         /* Scoping things for v6 */
1130         if ((error = sa6_recoverscope(sin6)) != 0) {
1131                 SCTP_FREE_SONAME(sin6);
1132                 return (error);
1133         }
1134         (*addr) = (struct sockaddr *)sin6;
1135         return (0);
1136 }
1137
1138 static int
1139 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1140 {
1141         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr;
1142         int fnd;
1143         struct sockaddr_in6 *sin_a6;
1144         struct sctp_inpcb *inp;
1145         struct sctp_tcb *stcb;
1146         struct sctp_nets *net;
1147
1148         int error;
1149
1150         /*
1151          * Do the malloc first in case it blocks.
1152          */
1153         inp = (struct sctp_inpcb *)so->so_pcb;
1154         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) {
1155                 /* UDP type and listeners will drop out here */
1156                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1157                 return (ENOTCONN);
1158         }
1159         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1160         sin6->sin6_family = AF_INET6;
1161         sin6->sin6_len = sizeof(*sin6);
1162
1163         /* We must recapture incase we blocked */
1164         inp = (struct sctp_inpcb *)so->so_pcb;
1165         if (inp == NULL) {
1166                 SCTP_FREE_SONAME(sin6);
1167                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1168                 return ECONNRESET;
1169         }
1170         SCTP_INP_RLOCK(inp);
1171         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1172         if (stcb) {
1173                 SCTP_TCB_LOCK(stcb);
1174         }
1175         SCTP_INP_RUNLOCK(inp);
1176         if (stcb == NULL) {
1177                 SCTP_FREE_SONAME(sin6);
1178                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1179                 return ECONNRESET;
1180         }
1181         fnd = 0;
1182         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1183                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1184                 if (sin_a6->sin6_family == AF_INET6) {
1185                         fnd = 1;
1186                         sin6->sin6_port = stcb->rport;
1187                         sin6->sin6_addr = sin_a6->sin6_addr;
1188                         break;
1189                 }
1190         }
1191         SCTP_TCB_UNLOCK(stcb);
1192         if (!fnd) {
1193                 /* No IPv4 address */
1194                 SCTP_FREE_SONAME(sin6);
1195                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1196                 return ENOENT;
1197         }
1198         if ((error = sa6_recoverscope(sin6)) != 0)
1199                 return (error);
1200         *addr = (struct sockaddr *)sin6;
1201         return (0);
1202 }
1203
1204 static int
1205 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1206 {
1207         struct sockaddr *addr;
1208         struct in6pcb *inp6 = sotoin6pcb(so);
1209         int error;
1210
1211         if (inp6 == NULL) {
1212                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1213                 return EINVAL;
1214         }
1215         /* allow v6 addresses precedence */
1216         error = sctp6_getaddr(so, nam);
1217         if (error) {
1218                 /* try v4 next if v6 failed */
1219                 error = sctp_ingetaddr(so, nam);
1220                 if (error) {
1221                         return (error);
1222                 }
1223                 addr = *nam;
1224                 /* if I'm V6ONLY, convert it to v4-mapped */
1225                 if (SCTP_IPV6_V6ONLY(inp6)) {
1226                         struct sockaddr_in6 sin6;
1227
1228                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1229                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1230
1231                 }
1232         }
1233         return (error);
1234 }
1235
1236
1237 static int
1238 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1239 {
1240         struct sockaddr *addr = *nam;
1241         struct in6pcb *inp6 = sotoin6pcb(so);
1242         int error;
1243
1244         if (inp6 == NULL) {
1245                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1246                 return EINVAL;
1247         }
1248         /* allow v6 addresses precedence */
1249         error = sctp6_peeraddr(so, nam);
1250         if (error) {
1251                 /* try v4 next if v6 failed */
1252                 error = sctp_peeraddr(so, nam);
1253                 if (error) {
1254                         return (error);
1255                 }
1256                 /* if I'm V6ONLY, convert it to v4-mapped */
1257                 if (SCTP_IPV6_V6ONLY(inp6)) {
1258                         struct sockaddr_in6 sin6;
1259
1260                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1261                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1262                 }
1263         }
1264         return error;
1265 }
1266
1267 struct pr_usrreqs sctp6_usrreqs = {
1268         .pru_abort = sctp6_abort,
1269         .pru_accept = sctp_accept,
1270         .pru_attach = sctp6_attach,
1271         .pru_bind = sctp6_bind,
1272         .pru_connect = sctp6_connect,
1273         .pru_control = in6_control,
1274         .pru_close = sctp6_close,
1275         .pru_detach = sctp6_close,
1276         .pru_sopoll = sopoll_generic,
1277         .pru_flush = sctp_flush,
1278         .pru_disconnect = sctp6_disconnect,
1279         .pru_listen = sctp_listen,
1280         .pru_peeraddr = sctp6_getpeeraddr,
1281         .pru_send = sctp6_send,
1282         .pru_shutdown = sctp_shutdown,
1283         .pru_sockaddr = sctp6_in6getaddr,
1284         .pru_sosend = sctp_sosend,
1285         .pru_soreceive = sctp_soreceive
1286 };