sys/netinet6/sctp6_usrreq.c

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