sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30 /*      $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $      */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include <netinet/sctp_os.h>
  36 #include <sys/proc.h>
  37 #include <netinet/sctp_pcb.h>
  38 #include <netinet/sctp_header.h>
  39 #include <netinet/sctp_var.h>
  40 #if defined(INET6)
  41 #include <netinet6/sctp6_var.h>
  42 #endif
  43 #include <netinet/sctp_sysctl.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_uio.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_indata.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_auth.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_output.h>
  53 #include <netinet/sctp_bsd_addr.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/udp.h>
  56
  57 #ifdef IPSEC
  58 #include <netipsec/ipsec.h>
  59 #if defined(INET6)
  60 #include <netipsec/ipsec6.h>
  61 #endif                          /* INET6 */
  62 #endif                          /* IPSEC */
  63
  64 extern struct protosw inetsw[];
  65
  66 int
  67 sctp6_input(struct mbuf **i_pak, int *offp, int proto)
  68 {
  69         struct mbuf *m;
  70         struct ip6_hdr *ip6;
  71         struct sctphdr *sh;
  72         struct sctp_inpcb *in6p = NULL;
  73         struct sctp_nets *net;
  74         int refcount_up = 0;
  75         uint32_t vrf_id = 0;
  76
  77 #ifdef IPSEC
  78         struct inpcb *in6p_ip;
  79
  80 #endif
  81         struct sctp_chunkhdr *ch;
  82         int length, offset, iphlen;
  83         uint8_t ecn_bits;
  84         struct sctp_tcb *stcb = NULL;
  85         int pkt_len = 0;
  86
  87 #if !defined(SCTP_WITH_NO_CSUM)
  88         uint32_t check, calc_check;
  89
  90 #endif
  91         int off = *offp;
  92         uint16_t port = 0;
  93
  94         /* get the VRF and table id's */
  95         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  96                 SCTP_RELEASE_PKT(*i_pak);
  97                 return (-1);
  98         }
  99         m = SCTP_HEADER_TO_CHAIN(*i_pak);
 100         pkt_len = SCTP_HEADER_LEN((*i_pak));
 101
 102 #ifdef  SCTP_PACKET_LOGGING
 103         sctp_packet_log(m, pkt_len);
 104 #endif
 105         ip6 = mtod(m, struct ip6_hdr *);
 106         /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
 107         IP6_EXTHDR_GET(sh, struct sctphdr *, m, off,
 108             (int)(sizeof(*sh) + sizeof(*ch)));
 109         if (sh == NULL) {
 110                 SCTP_STAT_INCR(sctps_hdrops);
 111                 return IPPROTO_DONE;
 112         }
 113         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 114         iphlen = off;
 115         offset = iphlen + sizeof(*sh) + sizeof(*ch);
 116         SCTPDBG(SCTP_DEBUG_INPUT1,
 117             "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen);
 118
 119
 120 #if defined(NFAITH) && NFAITH > 0
 121
 122         if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
 123                 /* XXX send icmp6 host/port unreach? */
 124                 goto bad;
 125         }
 126 #endif                          /* NFAITH defined and > 0 */
 127         SCTP_STAT_INCR(sctps_recvpackets);
 128         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 129         SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n",
 130             iphlen, pkt_len);
 131         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 132                 /* No multi-cast support in SCTP */
 133                 goto bad;
 134         }
 135         /* destination port of 0 is illegal, based on RFC2960. */
 136         if (sh->dest_port == 0)
 137                 goto bad;
 138
 139         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 140             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
 141             m->m_pkthdr.len,
 142             if_name(m->m_pkthdr.rcvif),
 143             m->m_pkthdr.csum_flags);
 144 #if defined(SCTP_WITH_NO_CSUM)
 145         SCTP_STAT_INCR(sctps_recvnocrc);
 146 #else
 147         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 148                 SCTP_STAT_INCR(sctps_recvhwcrc);
 149                 goto sctp_skip_csum;
 150         }
 151         check = sh->checksum;   /* save incoming checksum */
 152         if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) &&
 153             (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) {
 154                 SCTP_STAT_INCR(sctps_recvnocrc);
 155                 goto sctp_skip_csum;
 156         }
 157         sh->checksum = 0;       /* prepare for calc */
 158         calc_check = sctp_calculate_cksum(m, iphlen);
 159         SCTP_STAT_INCR(sctps_recvswcrc);
 160         if (calc_check != check) {
 161                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p phlen:%d\n",
 162                     calc_check, check, m, iphlen);
 163                 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 164                     sh, ch, &in6p, &net, vrf_id);
 165                 if ((net) && (port)) {
 166                         if (net->port == 0) {
 167                                 sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 168                         }
 169                         net->port = port;
 170                 }
 171                 /* in6p's ref-count increased && stcb locked */
 172                 if ((in6p) && (stcb)) {
 173                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
 174                         sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 175                 } else if ((in6p != NULL) && (stcb == NULL)) {
 176                         refcount_up = 1;
 177                 }
 178                 SCTP_STAT_INCR(sctps_badsum);
 179                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 180                 goto bad;
 181         }
 182         sh->checksum = calc_check;
 183
 184 sctp_skip_csum:
 185 #endif
 186         net = NULL;
 187         /*
 188          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
 189          * IP/SCTP/first chunk header...
 190          */
 191         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 192             sh, ch, &in6p, &net, vrf_id);
 193         if ((net) && (port)) {
 194                 if (net->port == 0) {
 195                         sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 196                 }
 197                 net->port = port;
 198         }
 199         /* in6p's ref-count increased */
 200         if (in6p == NULL) {
 201                 struct sctp_init_chunk *init_chk, chunk_buf;
 202
 203                 SCTP_STAT_INCR(sctps_noport);
 204                 if (ch->chunk_type == SCTP_INITIATION) {
 205                         /*
 206                          * we do a trick here to get the INIT tag, dig in
 207                          * and get the tag from the INIT and put it in the
 208                          * common header.
 209                          */
 210                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
 211                             iphlen + sizeof(*sh), sizeof(*init_chk),
 212                             (uint8_t *) & chunk_buf);
 213                         if (init_chk)
 214                                 sh->v_tag = init_chk->init.initiate_tag;
 215                         else
 216                                 sh->v_tag = 0;
 217                 }
 218                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 219                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
 220                         goto bad;
 221                 }
 222                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 223                         goto bad;
 224                 }
 225                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
 226                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
 227                 goto bad;
 228         } else if (stcb == NULL) {
 229                 refcount_up = 1;
 230         }
 231 #ifdef IPSEC
 232         /*
 233          * Check AH/ESP integrity.
 234          */
 235         in6p_ip = (struct inpcb *)in6p;
 236         if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) {
 237 /* XXX */
 238                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
 239                 goto bad;
 240         }
 241 #endif                          /* IPSEC */
 242
 243         /*
 244          * CONTROL chunk processing
 245          */
 246         offset -= sizeof(*ch);
 247         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 248
 249         /* Length now holds the total packet length payload + iphlen */
 250         length = ntohs(ip6->ip6_plen) + iphlen;
 251
 252         /* sa_ignore NO_NULL_CHK */
 253         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
 254             in6p, stcb, net, ecn_bits, vrf_id, port);
 255         /* inp's ref-count reduced && stcb unlocked */
 256         /* XXX this stuff below gets moved to appropriate parts later... */
 257         if (m)
 258                 sctp_m_freem(m);
 259         if ((in6p) && refcount_up) {
 260                 /* reduce ref-count */
 261                 SCTP_INP_WLOCK(in6p);
 262                 SCTP_INP_DECR_REF(in6p);
 263                 SCTP_INP_WUNLOCK(in6p);
 264         }
 265         return IPPROTO_DONE;
 266
 267 bad:
 268         if (stcb) {
 269                 SCTP_TCB_UNLOCK(stcb);
 270         }
 271         if ((in6p) && refcount_up) {
 272                 /* reduce ref-count */
 273                 SCTP_INP_WLOCK(in6p);
 274                 SCTP_INP_DECR_REF(in6p);
 275                 SCTP_INP_WUNLOCK(in6p);
 276         }
 277         if (m)
 278                 sctp_m_freem(m);
 279         return IPPROTO_DONE;
 280 }
 281
 282
 283 static void
 284 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 285     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 286 {
 287         uint32_t nxtsz;
 288
 289         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 290             (icmp6 == NULL) || (sh == NULL)) {
 291                 goto out;
 292         }
 293         /* First do we even look at it? */
 294         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 295                 goto out;
 296
 297         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 298                 /* not PACKET TO BIG */
 299                 goto out;
 300         }
 301         /*
 302          * ok we need to look closely. We could even get smarter and look at
 303          * anyone that we sent to in case we get a different ICMP that tells
 304          * us there is no way to reach a host, but for this impl, all we
 305          * care about is MTU discovery.
 306          */
 307         nxtsz = ntohl(icmp6->icmp6_mtu);
 308         /* Stop any PMTU timer */
 309         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 310
 311         /* Adjust destination size limit */
 312         if (net->mtu > nxtsz) {
 313                 net->mtu = nxtsz;
 314                 if (net->port) {
 315                         net->mtu -= sizeof(struct udphdr);
 316                 }
 317         }
 318         /* now what about the ep? */
 319         if (stcb->asoc.smallest_mtu > nxtsz) {
 320                 struct sctp_tmit_chunk *chk;
 321
 322                 /* Adjust that too */
 323                 stcb->asoc.smallest_mtu = nxtsz;
 324                 /* now off to subtract IP_DF flag if needed */
 325
 326                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 327                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 328                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 329                         }
 330                 }
 331                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 332                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 333                                 /*
 334                                  * For this guy we also mark for immediate
 335                                  * resend since we sent to big of chunk
 336                                  */
 337                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 338                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 339                                         stcb->asoc.sent_queue_retran_cnt++;
 340                                 chk->sent = SCTP_DATAGRAM_RESEND;
 341                                 chk->rec.data.doing_fast_retransmit = 0;
 342
 343                                 chk->sent = SCTP_DATAGRAM_RESEND;
 344                                 /* Clear any time so NO RTT is being done */
 345                                 chk->sent_rcv_time.tv_sec = 0;
 346                                 chk->sent_rcv_time.tv_usec = 0;
 347                                 stcb->asoc.total_flight -= chk->send_size;
 348                                 net->flight_size -= chk->send_size;
 349                         }
 350                 }
 351         }
 352         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 353 out:
 354         if (stcb) {
 355                 SCTP_TCB_UNLOCK(stcb);
 356         }
 357 }
 358
 359
 360 void
 361 sctp6_notify(struct sctp_inpcb *inp,
 362     struct icmp6_hdr *icmph,
 363     struct sctphdr *sh,
 364     struct sockaddr *to,
 365     struct sctp_tcb *stcb,
 366     struct sctp_nets *net)
 367 {
 368 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 369         struct socket *so;
 370
 371 #endif
 372         /* protection */
 373         int reason;
 374
 375
 376         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 377             (sh == NULL) || (to == NULL)) {
 378                 if (stcb)
 379                         SCTP_TCB_UNLOCK(stcb);
 380                 return;
 381         }
 382         /* First job is to verify the vtag matches what I would send */
 383         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 384                 SCTP_TCB_UNLOCK(stcb);
 385                 return;
 386         }
 387         if (icmph->icmp6_type != ICMP_UNREACH) {
 388                 /* We only care about unreachable */
 389                 SCTP_TCB_UNLOCK(stcb);
 390                 return;
 391         }
 392         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 393             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 394             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 395             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 396             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 397             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 398             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 399             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 400
 401                 /*
 402                  * Hmm reachablity problems we must examine closely. If its
 403                  * not reachable, we may have lost a network. Or if there is
 404                  * NO protocol at the other end named SCTP. well we consider
 405                  * it a OOTB abort.
 406                  */
 407                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 408                         /* Ok that destination is NOT reachable */
 409                         SCTP_PRINTF("ICMP (thresh %d/%d) takes interface %p down\n",
 410                             net->error_count,
 411                             net->failure_threshold,
 412                             net);
 413
 414                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 415                         net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
 416                         /*
 417                          * JRS 5/14/07 - If a destination is unreachable,
 418                          * the PF bit is turned off.  This allows an
 419                          * unambiguous use of the PF bit for destinations
 420                          * that are reachable but potentially failed. If the
 421                          * destination is set to the unreachable state, also
 422                          * set the destination to the PF state.
 423                          */
 424                         /*
 425                          * Add debug message here if destination is not in
 426                          * PF state.
 427                          */
 428                         /* Stop any running T3 timers here? */
 429                         if ((stcb->asoc.sctp_cmt_on_off == 1) &&
 430                             (stcb->asoc.sctp_cmt_pf > 0)) {
 431                                 net->dest_state &= ~SCTP_ADDR_PF;
 432                                 SCTPDBG(SCTP_DEBUG_TIMER4, "Destination %p moved from PF to unreachable.\n",
 433                                     net);
 434                         }
 435                         net->error_count = net->failure_threshold + 1;
 436                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 437                             stcb, SCTP_FAILED_THRESHOLD,
 438                             (void *)net, SCTP_SO_NOT_LOCKED);
 439                 }
 440                 SCTP_TCB_UNLOCK(stcb);
 441         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 442             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 443                 /*
 444                  * Here the peer is either playing tricks on us, including
 445                  * an address that belongs to someone who does not support
 446                  * SCTP OR was a userland implementation that shutdown and
 447                  * now is dead. In either case treat it like a OOTB abort
 448                  * with no TCB
 449                  */
 450                 reason = SCTP_PEER_FAULTY;
 451                 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED);
 452 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 453                 so = SCTP_INP_SO(inp);
 454                 atomic_add_int(&stcb->asoc.refcnt, 1);
 455                 SCTP_TCB_UNLOCK(stcb);
 456                 SCTP_SOCKET_LOCK(so, 1);
 457                 SCTP_TCB_LOCK(stcb);
 458                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 459 #endif
 460                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 461 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 462                 SCTP_SOCKET_UNLOCK(so, 1);
 463                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 464 #endif
 465                 /* no need to unlock here, since the TCB is gone */
 466         } else {
 467                 SCTP_TCB_UNLOCK(stcb);
 468         }
 469 }
 470
 471
 472
 473 void
 474 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 475 {
 476         struct sctphdr sh;
 477         struct ip6ctlparam *ip6cp = NULL;
 478         uint32_t vrf_id;
 479
 480         vrf_id = SCTP_DEFAULT_VRFID;
 481
 482         if (pktdst->sa_family != AF_INET6 ||
 483             pktdst->sa_len != sizeof(struct sockaddr_in6))
 484                 return;
 485
 486         if ((unsigned)cmd >= PRC_NCMDS)
 487                 return;
 488         if (PRC_IS_REDIRECT(cmd)) {
 489                 d = NULL;
 490         } else if (inet6ctlerrmap[cmd] == 0) {
 491                 return;
 492         }
 493         /* if the parameter is from icmp6, decode it. */
 494         if (d != NULL) {
 495                 ip6cp = (struct ip6ctlparam *)d;
 496         } else {
 497                 ip6cp = (struct ip6ctlparam *)NULL;
 498         }
 499
 500         if (ip6cp) {
 501                 /*
 502                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 503                  * valid.
 504                  */
 505                 /* check if we can safely examine src and dst ports */
 506                 struct sctp_inpcb *inp = NULL;
 507                 struct sctp_tcb *stcb = NULL;
 508                 struct sctp_nets *net = NULL;
 509                 struct sockaddr_in6 final;
 510
 511                 if (ip6cp->ip6c_m == NULL)
 512                         return;
 513
 514                 bzero(&sh, sizeof(sh));
 515                 bzero(&final, sizeof(final));
 516                 inp = NULL;
 517                 net = NULL;
 518                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 519                     (caddr_t)&sh);
 520                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 521                 final.sin6_len = sizeof(final);
 522                 final.sin6_family = AF_INET6;
 523                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 524                 final.sin6_port = sh.dest_port;
 525                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
 526                     (struct sockaddr *)&final,
 527                     &inp, &net, 1, vrf_id);
 528                 /* inp's ref-count increased && stcb locked */
 529                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 530                         if (cmd == PRC_MSGSIZE) {
 531                                 sctp6_notify_mbuf(inp,
 532                                     ip6cp->ip6c_icmp6,
 533                                     &sh,
 534                                     stcb,
 535                                     net);
 536                                 /* inp's ref-count reduced && stcb unlocked */
 537                         } else {
 538                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 539                                     (struct sockaddr *)&final,
 540                                     stcb, net);
 541                                 /* inp's ref-count reduced && stcb unlocked */
 542                         }
 543                 } else {
 544                         if (PRC_IS_REDIRECT(cmd) && inp) {
 545                                 in6_rtchange((struct in6pcb *)inp,
 546                                     inet6ctlerrmap[cmd]);
 547                         }
 548                         if (inp) {
 549                                 /* reduce inp's ref-count */
 550                                 SCTP_INP_WLOCK(inp);
 551                                 SCTP_INP_DECR_REF(inp);
 552                                 SCTP_INP_WUNLOCK(inp);
 553                         }
 554                         if (stcb)
 555                                 SCTP_TCB_UNLOCK(stcb);
 556                 }
 557         }
 558 }
 559
 560 /*
 561  * this routine can probably be collasped into the one in sctp_userreq.c
 562  * since they do the same thing and now we lookup with a sockaddr
 563  */
 564 static int
 565 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 566 {
 567         struct xucred xuc;
 568         struct sockaddr_in6 addrs[2];
 569         struct sctp_inpcb *inp;
 570         struct sctp_nets *net;
 571         struct sctp_tcb *stcb;
 572         int error;
 573         uint32_t vrf_id;
 574
 575         vrf_id = SCTP_DEFAULT_VRFID;
 576
 577         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 578         if (error)
 579                 return (error);
 580
 581         if (req->newlen != sizeof(addrs)) {
 582                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 583                 return (EINVAL);
 584         }
 585         if (req->oldlen != sizeof(struct ucred)) {
 586                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 587                 return (EINVAL);
 588         }
 589         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 590         if (error)
 591                 return (error);
 592
 593         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
 594             sin6tosa(&addrs[1]),
 595             &inp, &net, 1, vrf_id);
 596         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 597                 if ((inp != NULL) && (stcb == NULL)) {
 598                         /* reduce ref-count */
 599                         SCTP_INP_WLOCK(inp);
 600                         SCTP_INP_DECR_REF(inp);
 601                         goto cred_can_cont;
 602                 }
 603                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 604                 error = ENOENT;
 605                 goto out;
 606         }
 607         SCTP_TCB_UNLOCK(stcb);
 608         /*
 609          * We use the write lock here, only since in the error leg we need
 610          * it. If we used RLOCK, then we would have to
 611          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 612          * Better to use higher wlock.
 613          */
 614         SCTP_INP_WLOCK(inp);
 615 cred_can_cont:
 616         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 617         if (error) {
 618                 SCTP_INP_WUNLOCK(inp);
 619                 goto out;
 620         }
 621         cru2x(inp->sctp_socket->so_cred, &xuc);
 622         SCTP_INP_WUNLOCK(inp);
 623         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 624 out:
 625         return (error);
 626 }
 627
 628 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 629     0, 0,
 630     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 631
 632
 633 /* This is the same as the sctp_abort() could be made common */
 634 static void
 635 sctp6_abort(struct socket *so)
 636 {
 637         struct sctp_inpcb *inp;
 638         uint32_t flags;
 639
 640         inp = (struct sctp_inpcb *)so->so_pcb;
 641         if (inp == 0) {
 642                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 643                 return;
 644         }
 645 sctp_must_try_again:
 646         flags = inp->sctp_flags;
 647 #ifdef SCTP_LOG_CLOSING
 648         sctp_log_closing(inp, NULL, 17);
 649 #endif
 650         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 651             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 652 #ifdef SCTP_LOG_CLOSING
 653                 sctp_log_closing(inp, NULL, 16);
 654 #endif
 655                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 656                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 657                 SOCK_LOCK(so);
 658                 SCTP_SB_CLEAR(so->so_snd);
 659                 /*
 660                  * same for the rcv ones, they are only here for the
 661                  * accounting/select.
 662                  */
 663                 SCTP_SB_CLEAR(so->so_rcv);
 664                 /* Now null out the reference, we are completely detached. */
 665                 so->so_pcb = NULL;
 666                 SOCK_UNLOCK(so);
 667         } else {
 668                 flags = inp->sctp_flags;
 669                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 670                         goto sctp_must_try_again;
 671                 }
 672         }
 673         return;
 674 }
 675
 676 static int
 677 sctp6_attach(struct socket *so, int proto, struct thread *p)
 678 {
 679         struct in6pcb *inp6;
 680         int error;
 681         struct sctp_inpcb *inp;
 682         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 683
 684         inp = (struct sctp_inpcb *)so->so_pcb;
 685         if (inp != NULL) {
 686                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 687                 return EINVAL;
 688         }
 689         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 690                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 691                 if (error)
 692                         return error;
 693         }
 694         error = sctp_inpcb_alloc(so, vrf_id);
 695         if (error)
 696                 return error;
 697         inp = (struct sctp_inpcb *)so->so_pcb;
 698         SCTP_INP_WLOCK(inp);
 699         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 700         inp6 = (struct in6pcb *)inp;
 701
 702         inp6->inp_vflag |= INP_IPV6;
 703         inp6->in6p_hops = -1;   /* use kernel default */
 704         inp6->in6p_cksum = -1;  /* just to be sure */
 705 #ifdef INET
 706         /*
 707          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 708          * socket as well, because the socket may be bound to an IPv6
 709          * wildcard address, which may match an IPv4-mapped IPv6 address.
 710          */
 711         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 712 #endif
 713         /*
 714          * Hmm what about the IPSEC stuff that is missing here but in
 715          * sctp_attach()?
 716          */
 717         SCTP_INP_WUNLOCK(inp);
 718         return 0;
 719 }
 720
 721 static int
 722 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 723 {
 724         struct sctp_inpcb *inp;
 725         struct in6pcb *inp6;
 726         int error;
 727
 728         inp = (struct sctp_inpcb *)so->so_pcb;
 729         if (inp == 0) {
 730                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 731                 return EINVAL;
 732         }
 733         if (addr) {
 734                 if ((addr->sa_family == AF_INET6) &&
 735                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
 736                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 737                         return EINVAL;
 738                 }
 739                 if ((addr->sa_family == AF_INET) &&
 740                     (addr->sa_len != sizeof(struct sockaddr_in))) {
 741                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 742                         return EINVAL;
 743                 }
 744         }
 745         inp6 = (struct in6pcb *)inp;
 746         inp6->inp_vflag &= ~INP_IPV4;
 747         inp6->inp_vflag |= INP_IPV6;
 748         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 749                 if (addr->sa_family == AF_INET) {
 750                         /* binding v4 addr to v6 socket, so reset flags */
 751                         inp6->inp_vflag |= INP_IPV4;
 752                         inp6->inp_vflag &= ~INP_IPV6;
 753                 } else {
 754                         struct sockaddr_in6 *sin6_p;
 755
 756                         sin6_p = (struct sockaddr_in6 *)addr;
 757
 758                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 759                                 inp6->inp_vflag |= INP_IPV4;
 760                         } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 761                                 struct sockaddr_in sin;
 762
 763                                 in6_sin6_2_sin(&sin, sin6_p);
 764                                 inp6->inp_vflag |= INP_IPV4;
 765                                 inp6->inp_vflag &= ~INP_IPV6;
 766                                 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 767                                 return error;
 768                         }
 769                 }
 770         } else if (addr != NULL) {
 771                 /* IPV6_V6ONLY socket */
 772                 if (addr->sa_family == AF_INET) {
 773                         /* can't bind v4 addr to v6 only socket! */
 774                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 775                         return EINVAL;
 776                 } else {
 777                         struct sockaddr_in6 *sin6_p;
 778
 779                         sin6_p = (struct sockaddr_in6 *)addr;
 780
 781                         if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 782                                 /* can't bind v4-mapped addrs either! */
 783                                 /* NOTE: we don't support SIIT */
 784                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 785                                 return EINVAL;
 786                         }
 787                 }
 788         }
 789         error = sctp_inpcb_bind(so, addr, NULL, p);
 790         return error;
 791 }
 792
 793
 794 static void
 795 sctp6_close(struct socket *so)
 796 {
 797         sctp_close(so);
 798 }
 799
 800 /* This could be made common with sctp_detach() since they are identical */
 801
 802 static
 803 int
 804 sctp6_disconnect(struct socket *so)
 805 {
 806         return (sctp_disconnect(so));
 807 }
 808
 809
 810 int
 811 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 812     struct mbuf *control, struct thread *p);
 813
 814
 815 static int
 816 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 817     struct mbuf *control, struct thread *p)
 818 {
 819         struct sctp_inpcb *inp;
 820         struct in6pcb *inp6;
 821
 822 #ifdef INET
 823         struct sockaddr_in6 *sin6;
 824
 825 #endif                          /* INET */
 826         /* No SPL needed since sctp_output does this */
 827
 828         inp = (struct sctp_inpcb *)so->so_pcb;
 829         if (inp == NULL) {
 830                 if (control) {
 831                         SCTP_RELEASE_PKT(control);
 832                         control = NULL;
 833                 }
 834                 SCTP_RELEASE_PKT(m);
 835                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 836                 return EINVAL;
 837         }
 838         inp6 = (struct in6pcb *)inp;
 839         /*
 840          * For the TCP model we may get a NULL addr, if we are a connected
 841          * socket thats ok.
 842          */
 843         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 844             (addr == NULL)) {
 845                 goto connected_type;
 846         }
 847         if (addr == NULL) {
 848                 SCTP_RELEASE_PKT(m);
 849                 if (control) {
 850                         SCTP_RELEASE_PKT(control);
 851                         control = NULL;
 852                 }
 853                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 854                 return (EDESTADDRREQ);
 855         }
 856 #ifdef INET
 857         sin6 = (struct sockaddr_in6 *)addr;
 858         if (SCTP_IPV6_V6ONLY(inp6)) {
 859                 /*
 860                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 861                  * v4 addr or v4-mapped addr
 862                  */
 863                 if (addr->sa_family == AF_INET) {
 864                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 865                         return EINVAL;
 866                 }
 867                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 868                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 869                         return EINVAL;
 870                 }
 871         }
 872         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 873                 if (!MODULE_GLOBAL(ip6_v6only)) {
 874                         struct sockaddr_in sin;
 875
 876                         /* convert v4-mapped into v4 addr and send */
 877                         in6_sin6_2_sin(&sin, sin6);
 878                         return sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 879                             control, p);
 880                 } else {
 881                         /* mapped addresses aren't enabled */
 882                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 883                         return EINVAL;
 884                 }
 885         }
 886 #endif                          /* INET */
 887 connected_type:
 888         /* now what about control */
 889         if (control) {
 890                 if (inp->control) {
 891                         SCTP_PRINTF("huh? control set?\n");
 892                         SCTP_RELEASE_PKT(inp->control);
 893                         inp->control = NULL;
 894                 }
 895                 inp->control = control;
 896         }
 897         /* Place the data */
 898         if (inp->pkt) {
 899                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 900                 inp->pkt_last = m;
 901         } else {
 902                 inp->pkt_last = inp->pkt = m;
 903         }
 904         if (
 905         /* FreeBSD and MacOSX uses a flag passed */
 906             ((flags & PRUS_MORETOCOME) == 0)
 907             ) {
 908                 /*
 909                  * note with the current version this code will only be used
 910                  * by OpenBSD, NetBSD and FreeBSD have methods for
 911                  * re-defining sosend() to use sctp_sosend().  One can
 912                  * optionaly switch back to this code (by changing back the
 913                  * defininitions but this is not advisable.
 914                  */
 915                 int ret;
 916
 917                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 918                 inp->pkt = NULL;
 919                 inp->control = NULL;
 920                 return (ret);
 921         } else {
 922                 return (0);
 923         }
 924 }
 925
 926 static int
 927 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 928 {
 929         uint32_t vrf_id;
 930         int error = 0;
 931         struct sctp_inpcb *inp;
 932         struct in6pcb *inp6;
 933         struct sctp_tcb *stcb;
 934
 935 #ifdef INET
 936         struct sockaddr_in6 *sin6;
 937         struct sockaddr_storage ss;
 938
 939 #endif                          /* INET */
 940
 941         inp6 = (struct in6pcb *)so->so_pcb;
 942         inp = (struct sctp_inpcb *)so->so_pcb;
 943         if (inp == 0) {
 944                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 945                 return (ECONNRESET);    /* I made the same as TCP since we are
 946                                          * not setup? */
 947         }
 948         if (addr == NULL) {
 949                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 950                 return (EINVAL);
 951         }
 952         if ((addr->sa_family == AF_INET6) && (addr->sa_len != sizeof(struct sockaddr_in6))) {
 953                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 954                 return (EINVAL);
 955         }
 956         if ((addr->sa_family == AF_INET) && (addr->sa_len != sizeof(struct sockaddr_in))) {
 957                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 958                 return (EINVAL);
 959         }
 960         vrf_id = inp->def_vrf_id;
 961         SCTP_ASOC_CREATE_LOCK(inp);
 962         SCTP_INP_RLOCK(inp);
 963         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 964             SCTP_PCB_FLAGS_UNBOUND) {
 965                 /* Bind a ephemeral port */
 966                 SCTP_INP_RUNLOCK(inp);
 967                 error = sctp6_bind(so, NULL, p);
 968                 if (error) {
 969                         SCTP_ASOC_CREATE_UNLOCK(inp);
 970
 971                         return (error);
 972                 }
 973                 SCTP_INP_RLOCK(inp);
 974         }
 975         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 976             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 977                 /* We are already connected AND the TCP model */
 978                 SCTP_INP_RUNLOCK(inp);
 979                 SCTP_ASOC_CREATE_UNLOCK(inp);
 980                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 981                 return (EADDRINUSE);
 982         }
 983 #ifdef INET
 984         sin6 = (struct sockaddr_in6 *)addr;
 985         if (SCTP_IPV6_V6ONLY(inp6)) {
 986                 /*
 987                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 988                  * addr or v4-mapped addr
 989                  */
 990                 if (addr->sa_family == AF_INET) {
 991                         SCTP_INP_RUNLOCK(inp);
 992                         SCTP_ASOC_CREATE_UNLOCK(inp);
 993                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 994                         return EINVAL;
 995                 }
 996                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 997                         SCTP_INP_RUNLOCK(inp);
 998                         SCTP_ASOC_CREATE_UNLOCK(inp);
 999                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1000                         return EINVAL;
1001                 }
1002         }
1003         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1004                 if (!MODULE_GLOBAL(ip6_v6only)) {
1005                         /* convert v4-mapped into v4 addr */
1006                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
1007                         addr = (struct sockaddr *)&ss;
1008                 } else {
1009                         /* mapped addresses aren't enabled */
1010                         SCTP_INP_RUNLOCK(inp);
1011                         SCTP_ASOC_CREATE_UNLOCK(inp);
1012                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1013                         return EINVAL;
1014                 }
1015         } else
1016 #endif                          /* INET */
1017                 addr = addr;    /* for true v6 address case */
1018
1019         /* Now do we connect? */
1020         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1021                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1022                 if (stcb) {
1023                         SCTP_TCB_UNLOCK(stcb);
1024                 }
1025                 SCTP_INP_RUNLOCK(inp);
1026         } else {
1027                 SCTP_INP_RUNLOCK(inp);
1028                 SCTP_INP_WLOCK(inp);
1029                 SCTP_INP_INCR_REF(inp);
1030                 SCTP_INP_WUNLOCK(inp);
1031                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
1032                 if (stcb == NULL) {
1033                         SCTP_INP_WLOCK(inp);
1034                         SCTP_INP_DECR_REF(inp);
1035                         SCTP_INP_WUNLOCK(inp);
1036                 }
1037         }
1038
1039         if (stcb != NULL) {
1040                 /* Already have or am bring up an association */
1041                 SCTP_ASOC_CREATE_UNLOCK(inp);
1042                 SCTP_TCB_UNLOCK(stcb);
1043                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
1044                 return (EALREADY);
1045         }
1046         /* We are GOOD to go */
1047         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
1048         SCTP_ASOC_CREATE_UNLOCK(inp);
1049         if (stcb == NULL) {
1050                 /* Gak! no memory */
1051                 return (error);
1052         }
1053         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
1054                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1055                 /* Set the connected flag so we can queue data */
1056                 soisconnecting(so);
1057         }
1058         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
1059         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1060
1061         /* initialize authentication parameters for the assoc */
1062         sctp_initialize_auth_params(inp, stcb);
1063
1064         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
1065         SCTP_TCB_UNLOCK(stcb);
1066         return error;
1067 }
1068
1069 static int
1070 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
1071 {
1072         struct sockaddr_in6 *sin6;
1073         struct sctp_inpcb *inp;
1074         uint32_t vrf_id;
1075         struct sctp_ifa *sctp_ifa;
1076
1077         int error;
1078
1079         /*
1080          * Do the malloc first in case it blocks.
1081          */
1082         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1083         if (sin6 == NULL)
1084                 return ENOMEM;
1085         sin6->sin6_family = AF_INET6;
1086         sin6->sin6_len = sizeof(*sin6);
1087
1088         inp = (struct sctp_inpcb *)so->so_pcb;
1089         if (inp == NULL) {
1090                 SCTP_FREE_SONAME(sin6);
1091                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1092                 return ECONNRESET;
1093         }
1094         SCTP_INP_RLOCK(inp);
1095         sin6->sin6_port = inp->sctp_lport;
1096         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1097                 /* For the bound all case you get back 0 */
1098                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1099                         struct sctp_tcb *stcb;
1100                         struct sockaddr_in6 *sin_a6;
1101                         struct sctp_nets *net;
1102                         int fnd;
1103
1104                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1105                         if (stcb == NULL) {
1106                                 goto notConn6;
1107                         }
1108                         fnd = 0;
1109                         sin_a6 = NULL;
1110                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1111                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1112                                 if (sin_a6 == NULL)
1113                                         /* this will make coverity happy */
1114                                         continue;
1115
1116                                 if (sin_a6->sin6_family == AF_INET6) {
1117                                         fnd = 1;
1118                                         break;
1119                                 }
1120                         }
1121                         if ((!fnd) || (sin_a6 == NULL)) {
1122                                 /* punt */
1123                                 goto notConn6;
1124                         }
1125                         vrf_id = inp->def_vrf_id;
1126                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1127                         if (sctp_ifa) {
1128                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1129                         }
1130                 } else {
1131                         /* For the bound all case you get back 0 */
1132         notConn6:
1133                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1134                 }
1135         } else {
1136                 /* Take the first IPv6 address in the list */
1137                 struct sctp_laddr *laddr;
1138                 int fnd = 0;
1139
1140                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1141                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1142                                 struct sockaddr_in6 *sin_a;
1143
1144                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1145                                 sin6->sin6_addr = sin_a->sin6_addr;
1146                                 fnd = 1;
1147                                 break;
1148                         }
1149                 }
1150                 if (!fnd) {
1151                         SCTP_FREE_SONAME(sin6);
1152                         SCTP_INP_RUNLOCK(inp);
1153                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1154                         return ENOENT;
1155                 }
1156         }
1157         SCTP_INP_RUNLOCK(inp);
1158         /* Scoping things for v6 */
1159         if ((error = sa6_recoverscope(sin6)) != 0) {
1160                 SCTP_FREE_SONAME(sin6);
1161                 return (error);
1162         }
1163         (*addr) = (struct sockaddr *)sin6;
1164         return (0);
1165 }
1166
1167 static int
1168 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1169 {
1170         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr;
1171         int fnd;
1172         struct sockaddr_in6 *sin_a6;
1173         struct sctp_inpcb *inp;
1174         struct sctp_tcb *stcb;
1175         struct sctp_nets *net;
1176
1177         int error;
1178
1179         /*
1180          * Do the malloc first in case it blocks.
1181          */
1182         inp = (struct sctp_inpcb *)so->so_pcb;
1183         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) {
1184                 /* UDP type and listeners will drop out here */
1185                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1186                 return (ENOTCONN);
1187         }
1188         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1189         if (sin6 == NULL)
1190                 return (ENOMEM);
1191         sin6->sin6_family = AF_INET6;
1192         sin6->sin6_len = sizeof(*sin6);
1193
1194         /* We must recapture incase we blocked */
1195         inp = (struct sctp_inpcb *)so->so_pcb;
1196         if (inp == NULL) {
1197                 SCTP_FREE_SONAME(sin6);
1198                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1199                 return ECONNRESET;
1200         }
1201         SCTP_INP_RLOCK(inp);
1202         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1203         if (stcb) {
1204                 SCTP_TCB_LOCK(stcb);
1205         }
1206         SCTP_INP_RUNLOCK(inp);
1207         if (stcb == NULL) {
1208                 SCTP_FREE_SONAME(sin6);
1209                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1210                 return ECONNRESET;
1211         }
1212         fnd = 0;
1213         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1214                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1215                 if (sin_a6->sin6_family == AF_INET6) {
1216                         fnd = 1;
1217                         sin6->sin6_port = stcb->rport;
1218                         sin6->sin6_addr = sin_a6->sin6_addr;
1219                         break;
1220                 }
1221         }
1222         SCTP_TCB_UNLOCK(stcb);
1223         if (!fnd) {
1224                 /* No IPv4 address */
1225                 SCTP_FREE_SONAME(sin6);
1226                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1227                 return ENOENT;
1228         }
1229         if ((error = sa6_recoverscope(sin6)) != 0)
1230                 return (error);
1231         *addr = (struct sockaddr *)sin6;
1232         return (0);
1233 }
1234
1235 static int
1236 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1237 {
1238         struct sockaddr *addr;
1239         struct in6pcb *inp6 = sotoin6pcb(so);
1240         int error;
1241
1242         if (inp6 == NULL) {
1243                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1244                 return EINVAL;
1245         }
1246         /* allow v6 addresses precedence */
1247         error = sctp6_getaddr(so, nam);
1248         if (error) {
1249                 /* try v4 next if v6 failed */
1250                 error = sctp_ingetaddr(so, nam);
1251                 if (error) {
1252                         return (error);
1253                 }
1254                 addr = *nam;
1255                 /* if I'm V6ONLY, convert it to v4-mapped */
1256                 if (SCTP_IPV6_V6ONLY(inp6)) {
1257                         struct sockaddr_in6 sin6;
1258
1259                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1260                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1261
1262                 }
1263         }
1264         return (error);
1265 }
1266
1267
1268 static int
1269 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1270 {
1271         struct sockaddr *addr = *nam;
1272         struct in6pcb *inp6 = sotoin6pcb(so);
1273         int error;
1274
1275         if (inp6 == NULL) {
1276                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1277                 return EINVAL;
1278         }
1279         /* allow v6 addresses precedence */
1280         error = sctp6_peeraddr(so, nam);
1281         if (error) {
1282                 /* try v4 next if v6 failed */
1283                 error = sctp_peeraddr(so, nam);
1284                 if (error) {
1285                         return (error);
1286                 }
1287                 /* if I'm V6ONLY, convert it to v4-mapped */
1288                 if (SCTP_IPV6_V6ONLY(inp6)) {
1289                         struct sockaddr_in6 sin6;
1290
1291                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1292                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1293                 }
1294         }
1295         return error;
1296 }
1297
1298 struct pr_usrreqs sctp6_usrreqs = {
1299         .pru_abort = sctp6_abort,
1300         .pru_accept = sctp_accept,
1301         .pru_attach = sctp6_attach,
1302         .pru_bind = sctp6_bind,
1303         .pru_connect = sctp6_connect,
1304         .pru_control = in6_control,
1305         .pru_close = sctp6_close,
1306         .pru_detach = sctp6_close,
1307         .pru_sopoll = sopoll_generic,
1308         .pru_flush = sctp_flush,
1309         .pru_disconnect = sctp6_disconnect,
1310         .pru_listen = sctp_listen,
1311         .pru_peeraddr = sctp6_getpeeraddr,
1312         .pru_send = sctp6_send,
1313         .pru_shutdown = sctp_shutdown,
1314         .pru_sockaddr = sctp6_in6getaddr,
1315         .pru_sosend = sctp_sosend,
1316         .pru_soreceive = sctp_soreceive
1317 };