sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30 /*      $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $      */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include <netinet/sctp_os.h>
  36 #include <sys/proc.h>
  37 #include <netinet/sctp_pcb.h>
  38 #include <netinet/sctp_header.h>
  39 #include <netinet/sctp_var.h>
  40 #if defined(INET6)
  41 #include <netinet6/sctp6_var.h>
  42 #endif
  43 #include <netinet/sctp_sysctl.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_uio.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_indata.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_auth.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_output.h>
  53 #include <netinet/sctp_bsd_addr.h>
  54 #include <netinet/udp.h>
  55
  56 #ifdef IPSEC
  57 #include <netipsec/ipsec.h>
  58 #if defined(INET6)
  59 #include <netipsec/ipsec6.h>
  60 #endif                          /* INET6 */
  61 #endif                          /* IPSEC */
  62
  63 extern struct protosw inetsw[];
  64
  65 int
  66 sctp6_input(struct mbuf **i_pak, int *offp, int proto)
  67 {
  68         struct mbuf *m;
  69         struct ip6_hdr *ip6;
  70         struct sctphdr *sh;
  71         struct sctp_inpcb *in6p = NULL;
  72         struct sctp_nets *net;
  73         int refcount_up = 0;
  74         uint32_t check, calc_check;
  75         uint32_t vrf_id = 0;
  76         struct inpcb *in6p_ip;
  77         struct sctp_chunkhdr *ch;
  78         int length, mlen, offset, iphlen;
  79         uint8_t ecn_bits;
  80         struct sctp_tcb *stcb = NULL;
  81         int pkt_len = 0;
  82         int off = *offp;
  83         uint16_t port = 0;
  84
  85         /* get the VRF and table id's */
  86         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  87                 SCTP_RELEASE_PKT(*i_pak);
  88                 return (-1);
  89         }
  90         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  91         pkt_len = SCTP_HEADER_LEN((*i_pak));
  92
  93 #ifdef  SCTP_PACKET_LOGGING
  94         sctp_packet_log(m, pkt_len);
  95 #endif
  96         ip6 = mtod(m, struct ip6_hdr *);
  97         /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
  98         IP6_EXTHDR_GET(sh, struct sctphdr *, m, off,
  99             (int)(sizeof(*sh) + sizeof(*ch)));
 100         if (sh == NULL) {
 101                 SCTP_STAT_INCR(sctps_hdrops);
 102                 return IPPROTO_DONE;
 103         }
 104         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 105         iphlen = off;
 106         offset = iphlen + sizeof(*sh) + sizeof(*ch);
 107         SCTPDBG(SCTP_DEBUG_INPUT1,
 108             "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen);
 109
 110
 111 #if defined(NFAITH) && NFAITH > 0
 112
 113         if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
 114                 /* XXX send icmp6 host/port unreach? */
 115                 goto bad;
 116         }
 117 #endif                          /* NFAITH defined and > 0 */
 118         SCTP_STAT_INCR(sctps_recvpackets);
 119         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 120         SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n",
 121             iphlen, pkt_len);
 122         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 123                 /* No multi-cast support in SCTP */
 124                 goto bad;
 125         }
 126         /* destination port of 0 is illegal, based on RFC2960. */
 127         if (sh->dest_port == 0)
 128                 goto bad;
 129         check = sh->checksum;   /* save incoming checksum */
 130         if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) &&
 131             (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) {
 132                 goto sctp_skip_csum;
 133         }
 134         sh->checksum = 0;       /* prepare for calc */
 135         calc_check = sctp_calculate_sum(m, &mlen, iphlen);
 136         if (calc_check != check) {
 137                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
 138                     calc_check, check, m, mlen, iphlen);
 139                 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 140                     sh, ch, &in6p, &net, vrf_id);
 141                 if ((net) && (port)) {
 142                         if (net->port == 0) {
 143                                 sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 144                         }
 145                         net->port = port;
 146                 }
 147                 /* in6p's ref-count increased && stcb locked */
 148                 if ((in6p) && (stcb)) {
 149                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
 150                         sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 151                 } else if ((in6p != NULL) && (stcb == NULL)) {
 152                         refcount_up = 1;
 153                 }
 154                 SCTP_STAT_INCR(sctps_badsum);
 155                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 156                 goto bad;
 157         }
 158         sh->checksum = calc_check;
 159
 160 sctp_skip_csum:
 161         net = NULL;
 162         /*
 163          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
 164          * IP/SCTP/first chunk header...
 165          */
 166         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 167             sh, ch, &in6p, &net, vrf_id);
 168         if ((net) && (port)) {
 169                 if (net->port == 0) {
 170                         sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 171                 }
 172                 net->port = port;
 173         }
 174         /* in6p's ref-count increased */
 175         if (in6p == NULL) {
 176                 struct sctp_init_chunk *init_chk, chunk_buf;
 177
 178                 SCTP_STAT_INCR(sctps_noport);
 179                 if (ch->chunk_type == SCTP_INITIATION) {
 180                         /*
 181                          * we do a trick here to get the INIT tag, dig in
 182                          * and get the tag from the INIT and put it in the
 183                          * common header.
 184                          */
 185                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
 186                             iphlen + sizeof(*sh), sizeof(*init_chk),
 187                             (uint8_t *) & chunk_buf);
 188                         if (init_chk)
 189                                 sh->v_tag = init_chk->init.initiate_tag;
 190                         else
 191                                 sh->v_tag = 0;
 192                 }
 193                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 194                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
 195                         goto bad;
 196                 }
 197                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 198                         goto bad;
 199                 }
 200                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
 201                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
 202                 goto bad;
 203         } else if (stcb == NULL) {
 204                 refcount_up = 1;
 205         }
 206         in6p_ip = (struct inpcb *)in6p;
 207 #ifdef IPSEC
 208         /*
 209          * Check AH/ESP integrity.
 210          */
 211         if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) {
 212 /* XXX */
 213                 MODULE_GLOBAL(MOD_IPSEC, ipsec6stat).in_polvio++;
 214                 goto bad;
 215         }
 216 #endif                          /* IPSEC */
 217
 218         /*
 219          * CONTROL chunk processing
 220          */
 221         offset -= sizeof(*ch);
 222         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 223
 224         /* Length now holds the total packet length payload + iphlen */
 225         length = ntohs(ip6->ip6_plen) + iphlen;
 226
 227         /* sa_ignore NO_NULL_CHK */
 228         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
 229             in6p, stcb, net, ecn_bits, vrf_id, port);
 230         /* inp's ref-count reduced && stcb unlocked */
 231         /* XXX this stuff below gets moved to appropriate parts later... */
 232         if (m)
 233                 sctp_m_freem(m);
 234         if ((in6p) && refcount_up) {
 235                 /* reduce ref-count */
 236                 SCTP_INP_WLOCK(in6p);
 237                 SCTP_INP_DECR_REF(in6p);
 238                 SCTP_INP_WUNLOCK(in6p);
 239         }
 240         return IPPROTO_DONE;
 241
 242 bad:
 243         if (stcb) {
 244                 SCTP_TCB_UNLOCK(stcb);
 245         }
 246         if ((in6p) && refcount_up) {
 247                 /* reduce ref-count */
 248                 SCTP_INP_WLOCK(in6p);
 249                 SCTP_INP_DECR_REF(in6p);
 250                 SCTP_INP_WUNLOCK(in6p);
 251         }
 252         if (m)
 253                 sctp_m_freem(m);
 254         return IPPROTO_DONE;
 255 }
 256
 257
 258 static void
 259 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 260     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 261 {
 262         uint32_t nxtsz;
 263
 264         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 265             (icmp6 == NULL) || (sh == NULL)) {
 266                 goto out;
 267         }
 268         /* First do we even look at it? */
 269         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 270                 goto out;
 271
 272         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 273                 /* not PACKET TO BIG */
 274                 goto out;
 275         }
 276         /*
 277          * ok we need to look closely. We could even get smarter and look at
 278          * anyone that we sent to in case we get a different ICMP that tells
 279          * us there is no way to reach a host, but for this impl, all we
 280          * care about is MTU discovery.
 281          */
 282         nxtsz = ntohl(icmp6->icmp6_mtu);
 283         /* Stop any PMTU timer */
 284         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 285
 286         /* Adjust destination size limit */
 287         if (net->mtu > nxtsz) {
 288                 net->mtu = nxtsz;
 289                 if (net->port) {
 290                         net->mtu -= sizeof(struct udphdr);
 291                 }
 292         }
 293         /* now what about the ep? */
 294         if (stcb->asoc.smallest_mtu > nxtsz) {
 295                 struct sctp_tmit_chunk *chk;
 296
 297                 /* Adjust that too */
 298                 stcb->asoc.smallest_mtu = nxtsz;
 299                 /* now off to subtract IP_DF flag if needed */
 300
 301                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 302                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 303                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 304                         }
 305                 }
 306                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 307                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 308                                 /*
 309                                  * For this guy we also mark for immediate
 310                                  * resend since we sent to big of chunk
 311                                  */
 312                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 313                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 314                                         stcb->asoc.sent_queue_retran_cnt++;
 315                                 chk->sent = SCTP_DATAGRAM_RESEND;
 316                                 chk->rec.data.doing_fast_retransmit = 0;
 317
 318                                 chk->sent = SCTP_DATAGRAM_RESEND;
 319                                 /* Clear any time so NO RTT is being done */
 320                                 chk->sent_rcv_time.tv_sec = 0;
 321                                 chk->sent_rcv_time.tv_usec = 0;
 322                                 stcb->asoc.total_flight -= chk->send_size;
 323                                 net->flight_size -= chk->send_size;
 324                         }
 325                 }
 326         }
 327         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 328 out:
 329         if (stcb) {
 330                 SCTP_TCB_UNLOCK(stcb);
 331         }
 332 }
 333
 334
 335 void
 336 sctp6_notify(struct sctp_inpcb *inp,
 337     struct icmp6_hdr *icmph,
 338     struct sctphdr *sh,
 339     struct sockaddr *to,
 340     struct sctp_tcb *stcb,
 341     struct sctp_nets *net)
 342 {
 343 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 344         struct socket *so;
 345
 346 #endif
 347         /* protection */
 348         int reason;
 349
 350
 351         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 352             (sh == NULL) || (to == NULL)) {
 353                 if (stcb)
 354                         SCTP_TCB_UNLOCK(stcb);
 355                 return;
 356         }
 357         /* First job is to verify the vtag matches what I would send */
 358         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 359                 SCTP_TCB_UNLOCK(stcb);
 360                 return;
 361         }
 362         if (icmph->icmp6_type != ICMP_UNREACH) {
 363                 /* We only care about unreachable */
 364                 SCTP_TCB_UNLOCK(stcb);
 365                 return;
 366         }
 367         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 368             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 369             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 370             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 371             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 372             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 373             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 374             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 375
 376                 /*
 377                  * Hmm reachablity problems we must examine closely. If its
 378                  * not reachable, we may have lost a network. Or if there is
 379                  * NO protocol at the other end named SCTP. well we consider
 380                  * it a OOTB abort.
 381                  */
 382                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 383                         /* Ok that destination is NOT reachable */
 384                         SCTP_PRINTF("ICMP (thresh %d/%d) takes interface %p down\n",
 385                             net->error_count,
 386                             net->failure_threshold,
 387                             net);
 388
 389                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 390                         net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
 391                         /*
 392                          * JRS 5/14/07 - If a destination is unreachable,
 393                          * the PF bit is turned off.  This allows an
 394                          * unambiguous use of the PF bit for destinations
 395                          * that are reachable but potentially failed. If the
 396                          * destination is set to the unreachable state, also
 397                          * set the destination to the PF state.
 398                          */
 399                         /*
 400                          * Add debug message here if destination is not in
 401                          * PF state.
 402                          */
 403                         /* Stop any running T3 timers here? */
 404                         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
 405                                 net->dest_state &= ~SCTP_ADDR_PF;
 406                                 SCTPDBG(SCTP_DEBUG_TIMER4, "Destination %p moved from PF to unreachable.\n",
 407                                     net);
 408                         }
 409                         net->error_count = net->failure_threshold + 1;
 410                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 411                             stcb, SCTP_FAILED_THRESHOLD,
 412                             (void *)net, SCTP_SO_NOT_LOCKED);
 413                 }
 414                 SCTP_TCB_UNLOCK(stcb);
 415         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 416             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 417                 /*
 418                  * Here the peer is either playing tricks on us, including
 419                  * an address that belongs to someone who does not support
 420                  * SCTP OR was a userland implementation that shutdown and
 421                  * now is dead. In either case treat it like a OOTB abort
 422                  * with no TCB
 423                  */
 424                 reason = SCTP_PEER_FAULTY;
 425                 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED);
 426 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 427                 so = SCTP_INP_SO(inp);
 428                 atomic_add_int(&stcb->asoc.refcnt, 1);
 429                 SCTP_TCB_UNLOCK(stcb);
 430                 SCTP_SOCKET_LOCK(so, 1);
 431                 SCTP_TCB_LOCK(stcb);
 432                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 433 #endif
 434                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 435 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 436                 SCTP_SOCKET_UNLOCK(so, 1);
 437                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 438 #endif
 439                 /* no need to unlock here, since the TCB is gone */
 440         } else {
 441                 SCTP_TCB_UNLOCK(stcb);
 442         }
 443 }
 444
 445
 446
 447 void
 448 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 449 {
 450         struct sctphdr sh;
 451         struct ip6ctlparam *ip6cp = NULL;
 452         uint32_t vrf_id;
 453
 454         vrf_id = SCTP_DEFAULT_VRFID;
 455
 456         if (pktdst->sa_family != AF_INET6 ||
 457             pktdst->sa_len != sizeof(struct sockaddr_in6))
 458                 return;
 459
 460         if ((unsigned)cmd >= PRC_NCMDS)
 461                 return;
 462         if (PRC_IS_REDIRECT(cmd)) {
 463                 d = NULL;
 464         } else if (inet6ctlerrmap[cmd] == 0) {
 465                 return;
 466         }
 467         /* if the parameter is from icmp6, decode it. */
 468         if (d != NULL) {
 469                 ip6cp = (struct ip6ctlparam *)d;
 470         } else {
 471                 ip6cp = (struct ip6ctlparam *)NULL;
 472         }
 473
 474         if (ip6cp) {
 475                 /*
 476                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 477                  * valid.
 478                  */
 479                 /* check if we can safely examine src and dst ports */
 480                 struct sctp_inpcb *inp = NULL;
 481                 struct sctp_tcb *stcb = NULL;
 482                 struct sctp_nets *net = NULL;
 483                 struct sockaddr_in6 final;
 484
 485                 if (ip6cp->ip6c_m == NULL)
 486                         return;
 487
 488                 bzero(&sh, sizeof(sh));
 489                 bzero(&final, sizeof(final));
 490                 inp = NULL;
 491                 net = NULL;
 492                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 493                     (caddr_t)&sh);
 494                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 495                 final.sin6_len = sizeof(final);
 496                 final.sin6_family = AF_INET6;
 497                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 498                 final.sin6_port = sh.dest_port;
 499                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
 500                     (struct sockaddr *)&final,
 501                     &inp, &net, 1, vrf_id);
 502                 /* inp's ref-count increased && stcb locked */
 503                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 504                         if (cmd == PRC_MSGSIZE) {
 505                                 sctp6_notify_mbuf(inp,
 506                                     ip6cp->ip6c_icmp6,
 507                                     &sh,
 508                                     stcb,
 509                                     net);
 510                                 /* inp's ref-count reduced && stcb unlocked */
 511                         } else {
 512                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 513                                     (struct sockaddr *)&final,
 514                                     stcb, net);
 515                                 /* inp's ref-count reduced && stcb unlocked */
 516                         }
 517                 } else {
 518                         if (PRC_IS_REDIRECT(cmd) && inp) {
 519                                 in6_rtchange((struct in6pcb *)inp,
 520                                     inet6ctlerrmap[cmd]);
 521                         }
 522                         if (inp) {
 523                                 /* reduce inp's ref-count */
 524                                 SCTP_INP_WLOCK(inp);
 525                                 SCTP_INP_DECR_REF(inp);
 526                                 SCTP_INP_WUNLOCK(inp);
 527                         }
 528                         if (stcb)
 529                                 SCTP_TCB_UNLOCK(stcb);
 530                 }
 531         }
 532 }
 533
 534 /*
 535  * this routine can probably be collasped into the one in sctp_userreq.c
 536  * since they do the same thing and now we lookup with a sockaddr
 537  */
 538 static int
 539 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 540 {
 541         struct xucred xuc;
 542         struct sockaddr_in6 addrs[2];
 543         struct sctp_inpcb *inp;
 544         struct sctp_nets *net;
 545         struct sctp_tcb *stcb;
 546         int error;
 547         uint32_t vrf_id;
 548
 549         vrf_id = SCTP_DEFAULT_VRFID;
 550
 551         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 552         if (error)
 553                 return (error);
 554
 555         if (req->newlen != sizeof(addrs)) {
 556                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 557                 return (EINVAL);
 558         }
 559         if (req->oldlen != sizeof(struct ucred)) {
 560                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 561                 return (EINVAL);
 562         }
 563         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 564         if (error)
 565                 return (error);
 566
 567         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
 568             sin6tosa(&addrs[1]),
 569             &inp, &net, 1, vrf_id);
 570         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 571                 if ((inp != NULL) && (stcb == NULL)) {
 572                         /* reduce ref-count */
 573                         SCTP_INP_WLOCK(inp);
 574                         SCTP_INP_DECR_REF(inp);
 575                         goto cred_can_cont;
 576                 }
 577                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 578                 error = ENOENT;
 579                 goto out;
 580         }
 581         SCTP_TCB_UNLOCK(stcb);
 582         /*
 583          * We use the write lock here, only since in the error leg we need
 584          * it. If we used RLOCK, then we would have to
 585          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 586          * Better to use higher wlock.
 587          */
 588         SCTP_INP_WLOCK(inp);
 589 cred_can_cont:
 590         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 591         if (error) {
 592                 SCTP_INP_WUNLOCK(inp);
 593                 goto out;
 594         }
 595         cru2x(inp->sctp_socket->so_cred, &xuc);
 596         SCTP_INP_WUNLOCK(inp);
 597         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 598 out:
 599         return (error);
 600 }
 601
 602 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 603     0, 0,
 604     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 605
 606
 607 /* This is the same as the sctp_abort() could be made common */
 608 static void
 609 sctp6_abort(struct socket *so)
 610 {
 611         struct sctp_inpcb *inp;
 612         uint32_t flags;
 613
 614         inp = (struct sctp_inpcb *)so->so_pcb;
 615         if (inp == 0) {
 616                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 617                 return;
 618         }
 619 sctp_must_try_again:
 620         flags = inp->sctp_flags;
 621 #ifdef SCTP_LOG_CLOSING
 622         sctp_log_closing(inp, NULL, 17);
 623 #endif
 624         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 625             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 626 #ifdef SCTP_LOG_CLOSING
 627                 sctp_log_closing(inp, NULL, 16);
 628 #endif
 629                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 630                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 631                 SOCK_LOCK(so);
 632                 SCTP_SB_CLEAR(so->so_snd);
 633                 /*
 634                  * same for the rcv ones, they are only here for the
 635                  * accounting/select.
 636                  */
 637                 SCTP_SB_CLEAR(so->so_rcv);
 638                 /* Now null out the reference, we are completely detached. */
 639                 so->so_pcb = NULL;
 640                 SOCK_UNLOCK(so);
 641         } else {
 642                 flags = inp->sctp_flags;
 643                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 644                         goto sctp_must_try_again;
 645                 }
 646         }
 647         return;
 648 }
 649
 650 static int
 651 sctp6_attach(struct socket *so, int proto, struct thread *p)
 652 {
 653         struct in6pcb *inp6;
 654         int error;
 655         struct sctp_inpcb *inp;
 656         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 657
 658         inp = (struct sctp_inpcb *)so->so_pcb;
 659         if (inp != NULL) {
 660                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 661                 return EINVAL;
 662         }
 663         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 664                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 665                 if (error)
 666                         return error;
 667         }
 668         error = sctp_inpcb_alloc(so, vrf_id);
 669         if (error)
 670                 return error;
 671         inp = (struct sctp_inpcb *)so->so_pcb;
 672         SCTP_INP_WLOCK(inp);
 673         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 674         inp6 = (struct in6pcb *)inp;
 675
 676         inp6->inp_vflag |= INP_IPV6;
 677         inp6->in6p_hops = -1;   /* use kernel default */
 678         inp6->in6p_cksum = -1;  /* just to be sure */
 679 #ifdef INET
 680         /*
 681          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 682          * socket as well, because the socket may be bound to an IPv6
 683          * wildcard address, which may match an IPv4-mapped IPv6 address.
 684          */
 685         inp6->inp_ip_ttl = MODULE_GLOBAL(MOD_INET, ip_defttl);
 686 #endif
 687         /*
 688          * Hmm what about the IPSEC stuff that is missing here but in
 689          * sctp_attach()?
 690          */
 691         SCTP_INP_WUNLOCK(inp);
 692         return 0;
 693 }
 694
 695 static int
 696 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 697 {
 698         struct sctp_inpcb *inp;
 699         struct in6pcb *inp6;
 700         int error;
 701
 702         inp = (struct sctp_inpcb *)so->so_pcb;
 703         if (inp == 0) {
 704                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 705                 return EINVAL;
 706         }
 707         if (addr) {
 708                 if ((addr->sa_family == AF_INET6) &&
 709                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
 710                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 711                         return EINVAL;
 712                 }
 713                 if ((addr->sa_family == AF_INET) &&
 714                     (addr->sa_len != sizeof(struct sockaddr_in))) {
 715                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 716                         return EINVAL;
 717                 }
 718         }
 719         inp6 = (struct in6pcb *)inp;
 720         inp6->inp_vflag &= ~INP_IPV4;
 721         inp6->inp_vflag |= INP_IPV6;
 722         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 723                 if (addr->sa_family == AF_INET) {
 724                         /* binding v4 addr to v6 socket, so reset flags */
 725                         inp6->inp_vflag |= INP_IPV4;
 726                         inp6->inp_vflag &= ~INP_IPV6;
 727                 } else {
 728                         struct sockaddr_in6 *sin6_p;
 729
 730                         sin6_p = (struct sockaddr_in6 *)addr;
 731
 732                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 733                                 inp6->inp_vflag |= INP_IPV4;
 734                         } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 735                                 struct sockaddr_in sin;
 736
 737                                 in6_sin6_2_sin(&sin, sin6_p);
 738                                 inp6->inp_vflag |= INP_IPV4;
 739                                 inp6->inp_vflag &= ~INP_IPV6;
 740                                 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 741                                 return error;
 742                         }
 743                 }
 744         } else if (addr != NULL) {
 745                 /* IPV6_V6ONLY socket */
 746                 if (addr->sa_family == AF_INET) {
 747                         /* can't bind v4 addr to v6 only socket! */
 748                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 749                         return EINVAL;
 750                 } else {
 751                         struct sockaddr_in6 *sin6_p;
 752
 753                         sin6_p = (struct sockaddr_in6 *)addr;
 754
 755                         if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 756                                 /* can't bind v4-mapped addrs either! */
 757                                 /* NOTE: we don't support SIIT */
 758                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 759                                 return EINVAL;
 760                         }
 761                 }
 762         }
 763         error = sctp_inpcb_bind(so, addr, NULL, p);
 764         return error;
 765 }
 766
 767
 768 static void
 769 sctp6_close(struct socket *so)
 770 {
 771         sctp_close(so);
 772 }
 773
 774 /* This could be made common with sctp_detach() since they are identical */
 775
 776 static
 777 int
 778 sctp6_disconnect(struct socket *so)
 779 {
 780         return (sctp_disconnect(so));
 781 }
 782
 783
 784 int
 785 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 786     struct mbuf *control, struct thread *p);
 787
 788
 789 static int
 790 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 791     struct mbuf *control, struct thread *p)
 792 {
 793         struct sctp_inpcb *inp;
 794         struct inpcb *in_inp;
 795         struct in6pcb *inp6;
 796
 797 #ifdef INET
 798         struct sockaddr_in6 *sin6;
 799
 800 #endif                          /* INET */
 801         /* No SPL needed since sctp_output does this */
 802
 803         inp = (struct sctp_inpcb *)so->so_pcb;
 804         if (inp == NULL) {
 805                 if (control) {
 806                         SCTP_RELEASE_PKT(control);
 807                         control = NULL;
 808                 }
 809                 SCTP_RELEASE_PKT(m);
 810                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 811                 return EINVAL;
 812         }
 813         in_inp = (struct inpcb *)inp;
 814         inp6 = (struct in6pcb *)inp;
 815         /*
 816          * For the TCP model we may get a NULL addr, if we are a connected
 817          * socket thats ok.
 818          */
 819         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 820             (addr == NULL)) {
 821                 goto connected_type;
 822         }
 823         if (addr == NULL) {
 824                 SCTP_RELEASE_PKT(m);
 825                 if (control) {
 826                         SCTP_RELEASE_PKT(control);
 827                         control = NULL;
 828                 }
 829                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 830                 return (EDESTADDRREQ);
 831         }
 832 #ifdef INET
 833         sin6 = (struct sockaddr_in6 *)addr;
 834         if (SCTP_IPV6_V6ONLY(inp6)) {
 835                 /*
 836                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 837                  * v4 addr or v4-mapped addr
 838                  */
 839                 if (addr->sa_family == AF_INET) {
 840                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 841                         return EINVAL;
 842                 }
 843                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 844                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 845                         return EINVAL;
 846                 }
 847         }
 848         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 849                 if (!MODULE_GLOBAL(MOD_INET6, ip6_v6only)) {
 850                         struct sockaddr_in sin;
 851
 852                         /* convert v4-mapped into v4 addr and send */
 853                         in6_sin6_2_sin(&sin, sin6);
 854                         return sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 855                             control, p);
 856                 } else {
 857                         /* mapped addresses aren't enabled */
 858                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 859                         return EINVAL;
 860                 }
 861         }
 862 #endif                          /* INET */
 863 connected_type:
 864         /* now what about control */
 865         if (control) {
 866                 if (inp->control) {
 867                         SCTP_PRINTF("huh? control set?\n");
 868                         SCTP_RELEASE_PKT(inp->control);
 869                         inp->control = NULL;
 870                 }
 871                 inp->control = control;
 872         }
 873         /* Place the data */
 874         if (inp->pkt) {
 875                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 876                 inp->pkt_last = m;
 877         } else {
 878                 inp->pkt_last = inp->pkt = m;
 879         }
 880         if (
 881         /* FreeBSD and MacOSX uses a flag passed */
 882             ((flags & PRUS_MORETOCOME) == 0)
 883             ) {
 884                 /*
 885                  * note with the current version this code will only be used
 886                  * by OpenBSD, NetBSD and FreeBSD have methods for
 887                  * re-defining sosend() to use sctp_sosend().  One can
 888                  * optionaly switch back to this code (by changing back the
 889                  * defininitions but this is not advisable.
 890                  */
 891                 int ret;
 892
 893                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 894                 inp->pkt = NULL;
 895                 inp->control = NULL;
 896                 return (ret);
 897         } else {
 898                 return (0);
 899         }
 900 }
 901
 902 static int
 903 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 904 {
 905         uint32_t vrf_id;
 906         int error = 0;
 907         struct sctp_inpcb *inp;
 908         struct in6pcb *inp6;
 909         struct sctp_tcb *stcb;
 910
 911 #ifdef INET
 912         struct sockaddr_in6 *sin6;
 913         struct sockaddr_storage ss;
 914
 915 #endif                          /* INET */
 916
 917         inp6 = (struct in6pcb *)so->so_pcb;
 918         inp = (struct sctp_inpcb *)so->so_pcb;
 919         if (inp == 0) {
 920                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 921                 return (ECONNRESET);    /* I made the same as TCP since we are
 922                                          * not setup? */
 923         }
 924         if (addr == NULL) {
 925                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 926                 return (EINVAL);
 927         }
 928         if ((addr->sa_family == AF_INET6) && (addr->sa_len != sizeof(struct sockaddr_in6))) {
 929                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 930                 return (EINVAL);
 931         }
 932         if ((addr->sa_family == AF_INET) && (addr->sa_len != sizeof(struct sockaddr_in))) {
 933                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 934                 return (EINVAL);
 935         }
 936         vrf_id = inp->def_vrf_id;
 937         SCTP_ASOC_CREATE_LOCK(inp);
 938         SCTP_INP_RLOCK(inp);
 939         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 940             SCTP_PCB_FLAGS_UNBOUND) {
 941                 /* Bind a ephemeral port */
 942                 SCTP_INP_RUNLOCK(inp);
 943                 error = sctp6_bind(so, NULL, p);
 944                 if (error) {
 945                         SCTP_ASOC_CREATE_UNLOCK(inp);
 946
 947                         return (error);
 948                 }
 949                 SCTP_INP_RLOCK(inp);
 950         }
 951         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 952             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 953                 /* We are already connected AND the TCP model */
 954                 SCTP_INP_RUNLOCK(inp);
 955                 SCTP_ASOC_CREATE_UNLOCK(inp);
 956                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 957                 return (EADDRINUSE);
 958         }
 959 #ifdef INET
 960         sin6 = (struct sockaddr_in6 *)addr;
 961         if (SCTP_IPV6_V6ONLY(inp6)) {
 962                 /*
 963                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 964                  * addr or v4-mapped addr
 965                  */
 966                 if (addr->sa_family == AF_INET) {
 967                         SCTP_INP_RUNLOCK(inp);
 968                         SCTP_ASOC_CREATE_UNLOCK(inp);
 969                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 970                         return EINVAL;
 971                 }
 972                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 973                         SCTP_INP_RUNLOCK(inp);
 974                         SCTP_ASOC_CREATE_UNLOCK(inp);
 975                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 976                         return EINVAL;
 977                 }
 978         }
 979         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 980                 if (!MODULE_GLOBAL(MOD_INET6, ip6_v6only)) {
 981                         /* convert v4-mapped into v4 addr */
 982                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
 983                         addr = (struct sockaddr *)&ss;
 984                 } else {
 985                         /* mapped addresses aren't enabled */
 986                         SCTP_INP_RUNLOCK(inp);
 987                         SCTP_ASOC_CREATE_UNLOCK(inp);
 988                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 989                         return EINVAL;
 990                 }
 991         } else
 992 #endif                          /* INET */
 993                 addr = addr;    /* for true v6 address case */
 994
 995         /* Now do we connect? */
 996         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 997                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 998                 if (stcb) {
 999                         SCTP_TCB_UNLOCK(stcb);
1000                 }
1001                 SCTP_INP_RUNLOCK(inp);
1002         } else {
1003                 SCTP_INP_RUNLOCK(inp);
1004                 SCTP_INP_WLOCK(inp);
1005                 SCTP_INP_INCR_REF(inp);
1006                 SCTP_INP_WUNLOCK(inp);
1007                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
1008                 if (stcb == NULL) {
1009                         SCTP_INP_WLOCK(inp);
1010                         SCTP_INP_DECR_REF(inp);
1011                         SCTP_INP_WUNLOCK(inp);
1012                 }
1013         }
1014
1015         if (stcb != NULL) {
1016                 /* Already have or am bring up an association */
1017                 SCTP_ASOC_CREATE_UNLOCK(inp);
1018                 SCTP_TCB_UNLOCK(stcb);
1019                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
1020                 return (EALREADY);
1021         }
1022         /* We are GOOD to go */
1023         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id, p);
1024         SCTP_ASOC_CREATE_UNLOCK(inp);
1025         if (stcb == NULL) {
1026                 /* Gak! no memory */
1027                 return (error);
1028         }
1029         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
1030                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1031                 /* Set the connected flag so we can queue data */
1032                 soisconnecting(so);
1033         }
1034         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
1035         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1036
1037         /* initialize authentication parameters for the assoc */
1038         sctp_initialize_auth_params(inp, stcb);
1039
1040         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
1041         SCTP_TCB_UNLOCK(stcb);
1042         return error;
1043 }
1044
1045 static int
1046 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
1047 {
1048         struct sockaddr_in6 *sin6;
1049         struct sctp_inpcb *inp;
1050         uint32_t vrf_id;
1051         struct sctp_ifa *sctp_ifa;
1052
1053         int error;
1054
1055         /*
1056          * Do the malloc first in case it blocks.
1057          */
1058         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1059         sin6->sin6_family = AF_INET6;
1060         sin6->sin6_len = sizeof(*sin6);
1061
1062         inp = (struct sctp_inpcb *)so->so_pcb;
1063         if (inp == NULL) {
1064                 SCTP_FREE_SONAME(sin6);
1065                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1066                 return ECONNRESET;
1067         }
1068         SCTP_INP_RLOCK(inp);
1069         sin6->sin6_port = inp->sctp_lport;
1070         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1071                 /* For the bound all case you get back 0 */
1072                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1073                         struct sctp_tcb *stcb;
1074                         struct sockaddr_in6 *sin_a6;
1075                         struct sctp_nets *net;
1076                         int fnd;
1077
1078                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1079                         if (stcb == NULL) {
1080                                 goto notConn6;
1081                         }
1082                         fnd = 0;
1083                         sin_a6 = NULL;
1084                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1085                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1086                                 if (sin_a6 == NULL)
1087                                         /* this will make coverity happy */
1088                                         continue;
1089
1090                                 if (sin_a6->sin6_family == AF_INET6) {
1091                                         fnd = 1;
1092                                         break;
1093                                 }
1094                         }
1095                         if ((!fnd) || (sin_a6 == NULL)) {
1096                                 /* punt */
1097                                 goto notConn6;
1098                         }
1099                         vrf_id = inp->def_vrf_id;
1100                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1101                         if (sctp_ifa) {
1102                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1103                         }
1104                 } else {
1105                         /* For the bound all case you get back 0 */
1106         notConn6:
1107                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1108                 }
1109         } else {
1110                 /* Take the first IPv6 address in the list */
1111                 struct sctp_laddr *laddr;
1112                 int fnd = 0;
1113
1114                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1115                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1116                                 struct sockaddr_in6 *sin_a;
1117
1118                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1119                                 sin6->sin6_addr = sin_a->sin6_addr;
1120                                 fnd = 1;
1121                                 break;
1122                         }
1123                 }
1124                 if (!fnd) {
1125                         SCTP_FREE_SONAME(sin6);
1126                         SCTP_INP_RUNLOCK(inp);
1127                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1128                         return ENOENT;
1129                 }
1130         }
1131         SCTP_INP_RUNLOCK(inp);
1132         /* Scoping things for v6 */
1133         if ((error = sa6_recoverscope(sin6)) != 0) {
1134                 SCTP_FREE_SONAME(sin6);
1135                 return (error);
1136         }
1137         (*addr) = (struct sockaddr *)sin6;
1138         return (0);
1139 }
1140
1141 static int
1142 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1143 {
1144         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr;
1145         int fnd;
1146         struct sockaddr_in6 *sin_a6;
1147         struct sctp_inpcb *inp;
1148         struct sctp_tcb *stcb;
1149         struct sctp_nets *net;
1150
1151         int error;
1152
1153         /*
1154          * Do the malloc first in case it blocks.
1155          */
1156         inp = (struct sctp_inpcb *)so->so_pcb;
1157         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) {
1158                 /* UDP type and listeners will drop out here */
1159                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1160                 return (ENOTCONN);
1161         }
1162         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1163         sin6->sin6_family = AF_INET6;
1164         sin6->sin6_len = sizeof(*sin6);
1165
1166         /* We must recapture incase we blocked */
1167         inp = (struct sctp_inpcb *)so->so_pcb;
1168         if (inp == NULL) {
1169                 SCTP_FREE_SONAME(sin6);
1170                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1171                 return ECONNRESET;
1172         }
1173         SCTP_INP_RLOCK(inp);
1174         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1175         if (stcb) {
1176                 SCTP_TCB_LOCK(stcb);
1177         }
1178         SCTP_INP_RUNLOCK(inp);
1179         if (stcb == NULL) {
1180                 SCTP_FREE_SONAME(sin6);
1181                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1182                 return ECONNRESET;
1183         }
1184         fnd = 0;
1185         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1186                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1187                 if (sin_a6->sin6_family == AF_INET6) {
1188                         fnd = 1;
1189                         sin6->sin6_port = stcb->rport;
1190                         sin6->sin6_addr = sin_a6->sin6_addr;
1191                         break;
1192                 }
1193         }
1194         SCTP_TCB_UNLOCK(stcb);
1195         if (!fnd) {
1196                 /* No IPv4 address */
1197                 SCTP_FREE_SONAME(sin6);
1198                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1199                 return ENOENT;
1200         }
1201         if ((error = sa6_recoverscope(sin6)) != 0)
1202                 return (error);
1203         *addr = (struct sockaddr *)sin6;
1204         return (0);
1205 }
1206
1207 static int
1208 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1209 {
1210         struct sockaddr *addr;
1211         struct in6pcb *inp6 = sotoin6pcb(so);
1212         int error;
1213
1214         if (inp6 == NULL) {
1215                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1216                 return EINVAL;
1217         }
1218         /* allow v6 addresses precedence */
1219         error = sctp6_getaddr(so, nam);
1220         if (error) {
1221                 /* try v4 next if v6 failed */
1222                 error = sctp_ingetaddr(so, nam);
1223                 if (error) {
1224                         return (error);
1225                 }
1226                 addr = *nam;
1227                 /* if I'm V6ONLY, convert it to v4-mapped */
1228                 if (SCTP_IPV6_V6ONLY(inp6)) {
1229                         struct sockaddr_in6 sin6;
1230
1231                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1232                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1233
1234                 }
1235         }
1236         return (error);
1237 }
1238
1239
1240 static int
1241 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1242 {
1243         struct sockaddr *addr = *nam;
1244         struct in6pcb *inp6 = sotoin6pcb(so);
1245         int error;
1246
1247         if (inp6 == NULL) {
1248                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1249                 return EINVAL;
1250         }
1251         /* allow v6 addresses precedence */
1252         error = sctp6_peeraddr(so, nam);
1253         if (error) {
1254                 /* try v4 next if v6 failed */
1255                 error = sctp_peeraddr(so, nam);
1256                 if (error) {
1257                         return (error);
1258                 }
1259                 /* if I'm V6ONLY, convert it to v4-mapped */
1260                 if (SCTP_IPV6_V6ONLY(inp6)) {
1261                         struct sockaddr_in6 sin6;
1262
1263                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1264                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1265                 }
1266         }
1267         return error;
1268 }
1269
1270 struct pr_usrreqs sctp6_usrreqs = {
1271         .pru_abort = sctp6_abort,
1272         .pru_accept = sctp_accept,
1273         .pru_attach = sctp6_attach,
1274         .pru_bind = sctp6_bind,
1275         .pru_connect = sctp6_connect,
1276         .pru_control = in6_control,
1277         .pru_close = sctp6_close,
1278         .pru_detach = sctp6_close,
1279         .pru_sopoll = sopoll_generic,
1280         .pru_flush = sctp_flush,
1281         .pru_disconnect = sctp6_disconnect,
1282         .pru_listen = sctp_listen,
1283         .pru_peeraddr = sctp6_getpeeraddr,
1284         .pru_send = sctp6_send,
1285         .pru_shutdown = sctp_shutdown,
1286         .pru_sockaddr = sctp6_in6getaddr,
1287         .pru_sosend = sctp_sosend,
1288         .pru_soreceive = sctp_soreceive
1289 };