sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #ifdef INET6
  38 #include <sys/proc.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_var.h>
  42 #ifdef INET6
  43 #include <netinet6/sctp6_var.h>
  44 #endif
  45 #include <netinet/sctp_sysctl.h>
  46 #include <netinet/sctp_output.h>
  47 #include <netinet/sctp_uio.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctputil.h>
  50 #include <netinet/sctp_indata.h>
  51 #include <netinet/sctp_timer.h>
  52 #include <netinet/sctp_auth.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_output.h>
  55 #include <netinet/sctp_bsd_addr.h>
  56 #include <netinet/sctp_crc32.h>
  57 #include <netinet/udp.h>
  58
  59 #ifdef IPSEC
  60 #include <netipsec/ipsec.h>
  61 #ifdef INET6
  62 #include <netipsec/ipsec6.h>
  63 #endif                          /* INET6 */
  64 #endif                          /* IPSEC */
  65
  66 extern struct protosw inetsw[];
  67
  68 int
  69 sctp6_input(struct mbuf **i_pak, int *offp, int proto)
  70 {
  71         struct mbuf *m;
  72         struct ip6_hdr *ip6;
  73         struct sctphdr *sh;
  74         struct sctp_inpcb *in6p = NULL;
  75         struct sctp_nets *net;
  76         int refcount_up = 0;
  77         uint32_t vrf_id = 0;
  78
  79 #ifdef IPSEC
  80         struct inpcb *in6p_ip;
  81
  82 #endif
  83         struct sctp_chunkhdr *ch;
  84         int length, offset, iphlen;
  85         uint8_t ecn_bits;
  86         struct sctp_tcb *stcb = NULL;
  87         int pkt_len = 0;
  88         uint32_t mflowid;
  89         uint8_t use_mflowid;
  90
  91 #if !defined(SCTP_WITH_NO_CSUM)
  92         uint32_t check, calc_check;
  93
  94 #endif
  95         int off = *offp;
  96         uint16_t port = 0;
  97
  98         /* get the VRF and table id's */
  99         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
 100                 SCTP_RELEASE_PKT(*i_pak);
 101                 return (-1);
 102         }
 103         m = SCTP_HEADER_TO_CHAIN(*i_pak);
 104         pkt_len = SCTP_HEADER_LEN((*i_pak));
 105
 106 #ifdef  SCTP_PACKET_LOGGING
 107         sctp_packet_log(m, pkt_len);
 108 #endif
 109         if (m->m_flags & M_FLOWID) {
 110                 mflowid = m->m_pkthdr.flowid;
 111                 use_mflowid = 1;
 112         } else {
 113                 mflowid = 0;
 114                 use_mflowid = 0;
 115         }
 116         ip6 = mtod(m, struct ip6_hdr *);
 117         /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
 118         IP6_EXTHDR_GET(sh, struct sctphdr *, m, off,
 119             (int)(sizeof(*sh) + sizeof(*ch)));
 120         if (sh == NULL) {
 121                 SCTP_STAT_INCR(sctps_hdrops);
 122                 return (IPPROTO_DONE);
 123         }
 124         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 125         iphlen = off;
 126         offset = iphlen + sizeof(*sh) + sizeof(*ch);
 127         SCTPDBG(SCTP_DEBUG_INPUT1,
 128             "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen);
 129
 130
 131 #if defined(NFAITH) && NFAITH > 0
 132
 133         if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
 134                 /* XXX send icmp6 host/port unreach? */
 135                 goto bad;
 136         }
 137 #endif                          /* NFAITH defined and > 0 */
 138         SCTP_STAT_INCR(sctps_recvpackets);
 139         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 140         SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n",
 141             iphlen, pkt_len);
 142         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 143                 /* No multi-cast support in SCTP */
 144                 goto bad;
 145         }
 146         /* destination port of 0 is illegal, based on RFC2960. */
 147         if (sh->dest_port == 0)
 148                 goto bad;
 149
 150         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 151             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
 152             m->m_pkthdr.len,
 153             if_name(m->m_pkthdr.rcvif),
 154             m->m_pkthdr.csum_flags);
 155 #if defined(SCTP_WITH_NO_CSUM)
 156         SCTP_STAT_INCR(sctps_recvnocrc);
 157 #else
 158         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 159                 SCTP_STAT_INCR(sctps_recvhwcrc);
 160                 goto sctp_skip_csum;
 161         }
 162         check = sh->checksum;   /* save incoming checksum */
 163         sh->checksum = 0;       /* prepare for calc */
 164         calc_check = sctp_calculate_cksum(m, iphlen);
 165         SCTP_STAT_INCR(sctps_recvswcrc);
 166         if (calc_check != check) {
 167                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p phlen:%d\n",
 168                     calc_check, check, m, iphlen);
 169                 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
 170                     sh, ch, &in6p, &net, vrf_id);
 171                 if ((net) && (port)) {
 172                         if (net->port == 0) {
 173                                 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
 174                         }
 175                         net->port = port;
 176                 }
 177                 if ((net != NULL) && (use_mflowid != 0)) {
 178                         net->flowid = mflowid;
 179 #ifdef INVARIANTS
 180                         net->flowidset = 1;
 181 #endif
 182                 }
 183                 /* in6p's ref-count increased && stcb locked */
 184                 if ((in6p) && (stcb)) {
 185                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
 186                         sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 187                 } else if ((in6p != NULL) && (stcb == NULL)) {
 188                         refcount_up = 1;
 189                 }
 190                 SCTP_STAT_INCR(sctps_badsum);
 191                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 192                 goto bad;
 193         }
 194         sh->checksum = calc_check;
 195
 196 sctp_skip_csum:
 197 #endif
 198         net = NULL;
 199         /*
 200          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
 201          * IP/SCTP/first chunk header...
 202          */
 203         stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
 204             sh, ch, &in6p, &net, vrf_id);
 205         if ((net) && (port)) {
 206                 if (net->port == 0) {
 207                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
 208                 }
 209                 net->port = port;
 210         }
 211         if ((net != NULL) && (use_mflowid != 0)) {
 212                 net->flowid = mflowid;
 213 #ifdef INVARIANTS
 214                 net->flowidset = 1;
 215 #endif
 216         }
 217         /* in6p's ref-count increased */
 218         if (in6p == NULL) {
 219                 struct sctp_init_chunk *init_chk, chunk_buf;
 220
 221                 SCTP_STAT_INCR(sctps_noport);
 222                 if (ch->chunk_type == SCTP_INITIATION) {
 223                         /*
 224                          * we do a trick here to get the INIT tag, dig in
 225                          * and get the tag from the INIT and put it in the
 226                          * common header.
 227                          */
 228                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
 229                             iphlen + sizeof(*sh), sizeof(*init_chk),
 230                             (uint8_t *) & chunk_buf);
 231                         if (init_chk)
 232                                 sh->v_tag = init_chk->init.initiate_tag;
 233                         else
 234                                 sh->v_tag = 0;
 235                 }
 236                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 237                         sctp_send_shutdown_complete2(m, sh,
 238                             use_mflowid, mflowid,
 239                             vrf_id, port);
 240                         goto bad;
 241                 }
 242                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 243                         goto bad;
 244                 }
 245                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
 246                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
 247                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
 248                             (ch->chunk_type != SCTP_INIT))) {
 249                                 sctp_send_abort(m, iphlen, sh, 0, NULL,
 250                                     use_mflowid, mflowid,
 251                                     vrf_id, port);
 252                         }
 253                 }
 254                 goto bad;
 255         } else if (stcb == NULL) {
 256                 refcount_up = 1;
 257         }
 258 #ifdef IPSEC
 259         /*
 260          * Check AH/ESP integrity.
 261          */
 262         in6p_ip = (struct inpcb *)in6p;
 263         if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) {
 264 /* XXX */
 265                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
 266                 goto bad;
 267         }
 268 #endif                          /* IPSEC */
 269
 270         /*
 271          * CONTROL chunk processing
 272          */
 273         offset -= sizeof(*ch);
 274         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 275
 276         /* Length now holds the total packet length payload + iphlen */
 277         length = ntohs(ip6->ip6_plen) + iphlen;
 278
 279         /* sa_ignore NO_NULL_CHK */
 280         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
 281             in6p, stcb, net, ecn_bits,
 282             use_mflowid, mflowid,
 283             vrf_id, port);
 284         /* inp's ref-count reduced && stcb unlocked */
 285         /* XXX this stuff below gets moved to appropriate parts later... */
 286         if (m)
 287                 sctp_m_freem(m);
 288         if ((in6p) && refcount_up) {
 289                 /* reduce ref-count */
 290                 SCTP_INP_WLOCK(in6p);
 291                 SCTP_INP_DECR_REF(in6p);
 292                 SCTP_INP_WUNLOCK(in6p);
 293         }
 294         return (IPPROTO_DONE);
 295
 296 bad:
 297         if (stcb) {
 298                 SCTP_TCB_UNLOCK(stcb);
 299         }
 300         if ((in6p) && refcount_up) {
 301                 /* reduce ref-count */
 302                 SCTP_INP_WLOCK(in6p);
 303                 SCTP_INP_DECR_REF(in6p);
 304                 SCTP_INP_WUNLOCK(in6p);
 305         }
 306         if (m)
 307                 sctp_m_freem(m);
 308         return (IPPROTO_DONE);
 309 }
 310
 311
 312 static void
 313 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 314     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 315 {
 316         uint32_t nxtsz;
 317
 318         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 319             (icmp6 == NULL) || (sh == NULL)) {
 320                 goto out;
 321         }
 322         /* First do we even look at it? */
 323         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 324                 goto out;
 325
 326         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 327                 /* not PACKET TO BIG */
 328                 goto out;
 329         }
 330         /*
 331          * ok we need to look closely. We could even get smarter and look at
 332          * anyone that we sent to in case we get a different ICMP that tells
 333          * us there is no way to reach a host, but for this impl, all we
 334          * care about is MTU discovery.
 335          */
 336         nxtsz = ntohl(icmp6->icmp6_mtu);
 337         /* Stop any PMTU timer */
 338         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 339
 340         /* Adjust destination size limit */
 341         if (net->mtu > nxtsz) {
 342                 net->mtu = nxtsz;
 343                 if (net->port) {
 344                         net->mtu -= sizeof(struct udphdr);
 345                 }
 346         }
 347         /* now what about the ep? */
 348         if (stcb->asoc.smallest_mtu > nxtsz) {
 349                 struct sctp_tmit_chunk *chk;
 350
 351                 /* Adjust that too */
 352                 stcb->asoc.smallest_mtu = nxtsz;
 353                 /* now off to subtract IP_DF flag if needed */
 354
 355                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 356                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 357                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 358                         }
 359                 }
 360                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 361                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 362                                 /*
 363                                  * For this guy we also mark for immediate
 364                                  * resend since we sent to big of chunk
 365                                  */
 366                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 367                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 368                                         stcb->asoc.sent_queue_retran_cnt++;
 369                                 chk->sent = SCTP_DATAGRAM_RESEND;
 370                                 chk->rec.data.doing_fast_retransmit = 0;
 371
 372                                 chk->sent = SCTP_DATAGRAM_RESEND;
 373                                 /* Clear any time so NO RTT is being done */
 374                                 chk->sent_rcv_time.tv_sec = 0;
 375                                 chk->sent_rcv_time.tv_usec = 0;
 376                                 stcb->asoc.total_flight -= chk->send_size;
 377                                 net->flight_size -= chk->send_size;
 378                         }
 379                 }
 380         }
 381         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 382 out:
 383         if (stcb) {
 384                 SCTP_TCB_UNLOCK(stcb);
 385         }
 386 }
 387
 388
 389 void
 390 sctp6_notify(struct sctp_inpcb *inp,
 391     struct icmp6_hdr *icmph,
 392     struct sctphdr *sh,
 393     struct sockaddr *to,
 394     struct sctp_tcb *stcb,
 395     struct sctp_nets *net)
 396 {
 397 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 398         struct socket *so;
 399
 400 #endif
 401
 402         /* protection */
 403         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 404             (sh == NULL) || (to == NULL)) {
 405                 if (stcb)
 406                         SCTP_TCB_UNLOCK(stcb);
 407                 return;
 408         }
 409         /* First job is to verify the vtag matches what I would send */
 410         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 411                 SCTP_TCB_UNLOCK(stcb);
 412                 return;
 413         }
 414         if (icmph->icmp6_type != ICMP_UNREACH) {
 415                 /* We only care about unreachable */
 416                 SCTP_TCB_UNLOCK(stcb);
 417                 return;
 418         }
 419         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 420             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 421             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 422             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 423             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 424             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 425             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 426             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 427
 428                 /*
 429                  * Hmm reachablity problems we must examine closely. If its
 430                  * not reachable, we may have lost a network. Or if there is
 431                  * NO protocol at the other end named SCTP. well we consider
 432                  * it a OOTB abort.
 433                  */
 434                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 435                         /* Ok that destination is NOT reachable */
 436                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 437                         net->dest_state &= ~SCTP_ADDR_PF;
 438                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 439                             stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 440                 }
 441                 SCTP_TCB_UNLOCK(stcb);
 442         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 443             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 444                 /*
 445                  * Here the peer is either playing tricks on us, including
 446                  * an address that belongs to someone who does not support
 447                  * SCTP OR was a userland implementation that shutdown and
 448                  * now is dead. In either case treat it like a OOTB abort
 449                  * with no TCB
 450                  */
 451                 sctp_abort_notification(stcb, 1, 0, NULL, 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 == NULL) {
 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 SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 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 == NULL) {
 730                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 731                 return (EINVAL);
 732         }
 733         if (addr) {
 734                 switch (addr->sa_family) {
 735 #ifdef INET
 736                 case AF_INET:
 737                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 738                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 739                                 return (EINVAL);
 740                         }
 741                         break;
 742 #endif
 743 #ifdef INET6
 744                 case AF_INET6:
 745                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 746                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 747                                 return (EINVAL);
 748                         }
 749                         break;
 750 #endif
 751                 default:
 752                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 753                         return (EINVAL);
 754                 }
 755         }
 756         inp6 = (struct in6pcb *)inp;
 757         inp6->inp_vflag &= ~INP_IPV4;
 758         inp6->inp_vflag |= INP_IPV6;
 759         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 760                 switch (addr->sa_family) {
 761 #ifdef INET
 762                 case AF_INET:
 763                         /* binding v4 addr to v6 socket, so reset flags */
 764                         inp6->inp_vflag |= INP_IPV4;
 765                         inp6->inp_vflag &= ~INP_IPV6;
 766                         break;
 767 #endif
 768 #ifdef INET6
 769                 case AF_INET6:
 770                         {
 771                                 struct sockaddr_in6 *sin6_p;
 772
 773                                 sin6_p = (struct sockaddr_in6 *)addr;
 774
 775                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 776                                         inp6->inp_vflag |= INP_IPV4;
 777                                 }
 778 #ifdef INET
 779                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 780                                         struct sockaddr_in sin;
 781
 782                                         in6_sin6_2_sin(&sin, sin6_p);
 783                                         inp6->inp_vflag |= INP_IPV4;
 784                                         inp6->inp_vflag &= ~INP_IPV6;
 785                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 786                                         return (error);
 787                                 }
 788 #endif
 789                                 break;
 790                         }
 791 #endif
 792                 default:
 793                         break;
 794                 }
 795         } else if (addr != NULL) {
 796                 struct sockaddr_in6 *sin6_p;
 797
 798                 /* IPV6_V6ONLY socket */
 799 #ifdef INET
 800                 if (addr->sa_family == AF_INET) {
 801                         /* can't bind v4 addr to v6 only socket! */
 802                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 803                         return (EINVAL);
 804                 }
 805 #endif
 806                 sin6_p = (struct sockaddr_in6 *)addr;
 807
 808                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 809                         /* can't bind v4-mapped addrs either! */
 810                         /* NOTE: we don't support SIIT */
 811                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 812                         return (EINVAL);
 813                 }
 814         }
 815         error = sctp_inpcb_bind(so, addr, NULL, p);
 816         return (error);
 817 }
 818
 819
 820 static void
 821 sctp6_close(struct socket *so)
 822 {
 823         sctp_close(so);
 824 }
 825
 826 /* This could be made common with sctp_detach() since they are identical */
 827
 828 static
 829 int
 830 sctp6_disconnect(struct socket *so)
 831 {
 832         return (sctp_disconnect(so));
 833 }
 834
 835
 836 int
 837 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 838     struct mbuf *control, struct thread *p);
 839
 840
 841 static int
 842 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 843     struct mbuf *control, struct thread *p)
 844 {
 845         struct sctp_inpcb *inp;
 846         struct in6pcb *inp6;
 847
 848 #ifdef INET
 849         struct sockaddr_in6 *sin6;
 850
 851 #endif                          /* INET */
 852         /* No SPL needed since sctp_output does this */
 853
 854         inp = (struct sctp_inpcb *)so->so_pcb;
 855         if (inp == NULL) {
 856                 if (control) {
 857                         SCTP_RELEASE_PKT(control);
 858                         control = NULL;
 859                 }
 860                 SCTP_RELEASE_PKT(m);
 861                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 862                 return (EINVAL);
 863         }
 864         inp6 = (struct in6pcb *)inp;
 865         /*
 866          * For the TCP model we may get a NULL addr, if we are a connected
 867          * socket thats ok.
 868          */
 869         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 870             (addr == NULL)) {
 871                 goto connected_type;
 872         }
 873         if (addr == NULL) {
 874                 SCTP_RELEASE_PKT(m);
 875                 if (control) {
 876                         SCTP_RELEASE_PKT(control);
 877                         control = NULL;
 878                 }
 879                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 880                 return (EDESTADDRREQ);
 881         }
 882 #ifdef INET
 883         sin6 = (struct sockaddr_in6 *)addr;
 884         if (SCTP_IPV6_V6ONLY(inp6)) {
 885                 /*
 886                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 887                  * v4 addr or v4-mapped addr
 888                  */
 889                 if (addr->sa_family == AF_INET) {
 890                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 891                         return (EINVAL);
 892                 }
 893                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 894                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 895                         return (EINVAL);
 896                 }
 897         }
 898         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 899                 if (!MODULE_GLOBAL(ip6_v6only)) {
 900                         struct sockaddr_in sin;
 901
 902                         /* convert v4-mapped into v4 addr and send */
 903                         in6_sin6_2_sin(&sin, sin6);
 904                         return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 905                             control, p));
 906                 } else {
 907                         /* mapped addresses aren't enabled */
 908                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 909                         return (EINVAL);
 910                 }
 911         }
 912 #endif                          /* INET */
 913 connected_type:
 914         /* now what about control */
 915         if (control) {
 916                 if (inp->control) {
 917                         SCTP_PRINTF("huh? control set?\n");
 918                         SCTP_RELEASE_PKT(inp->control);
 919                         inp->control = NULL;
 920                 }
 921                 inp->control = control;
 922         }
 923         /* Place the data */
 924         if (inp->pkt) {
 925                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 926                 inp->pkt_last = m;
 927         } else {
 928                 inp->pkt_last = inp->pkt = m;
 929         }
 930         if (
 931         /* FreeBSD and MacOSX uses a flag passed */
 932             ((flags & PRUS_MORETOCOME) == 0)
 933             ) {
 934                 /*
 935                  * note with the current version this code will only be used
 936                  * by OpenBSD, NetBSD and FreeBSD have methods for
 937                  * re-defining sosend() to use sctp_sosend().  One can
 938                  * optionaly switch back to this code (by changing back the
 939                  * defininitions but this is not advisable.
 940                  */
 941                 int ret;
 942
 943                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 944                 inp->pkt = NULL;
 945                 inp->control = NULL;
 946                 return (ret);
 947         } else {
 948                 return (0);
 949         }
 950 }
 951
 952 static int
 953 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 954 {
 955         uint32_t vrf_id;
 956         int error = 0;
 957         struct sctp_inpcb *inp;
 958         struct in6pcb *inp6;
 959         struct sctp_tcb *stcb;
 960
 961 #ifdef INET
 962         struct sockaddr_in6 *sin6;
 963         struct sockaddr_storage ss;
 964
 965 #endif
 966
 967         inp6 = (struct in6pcb *)so->so_pcb;
 968         inp = (struct sctp_inpcb *)so->so_pcb;
 969         if (inp == NULL) {
 970                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 971                 return (ECONNRESET);    /* I made the same as TCP since we are
 972                                          * not setup? */
 973         }
 974         if (addr == NULL) {
 975                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 976                 return (EINVAL);
 977         }
 978         switch (addr->sa_family) {
 979 #ifdef INET
 980         case AF_INET:
 981                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 982                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 983                         return (EINVAL);
 984                 }
 985                 break;
 986 #endif
 987 #ifdef INET6
 988         case AF_INET6:
 989                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 990                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 991                         return (EINVAL);
 992                 }
 993                 break;
 994 #endif
 995         default:
 996                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 997                 return (EINVAL);
 998         }
 999
1000         vrf_id = inp->def_vrf_id;
1001         SCTP_ASOC_CREATE_LOCK(inp);
1002         SCTP_INP_RLOCK(inp);
1003         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
1004             SCTP_PCB_FLAGS_UNBOUND) {
1005                 /* Bind a ephemeral port */
1006                 SCTP_INP_RUNLOCK(inp);
1007                 error = sctp6_bind(so, NULL, p);
1008                 if (error) {
1009                         SCTP_ASOC_CREATE_UNLOCK(inp);
1010
1011                         return (error);
1012                 }
1013                 SCTP_INP_RLOCK(inp);
1014         }
1015         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
1016             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
1017                 /* We are already connected AND the TCP model */
1018                 SCTP_INP_RUNLOCK(inp);
1019                 SCTP_ASOC_CREATE_UNLOCK(inp);
1020                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
1021                 return (EADDRINUSE);
1022         }
1023 #ifdef INET
1024         sin6 = (struct sockaddr_in6 *)addr;
1025         if (SCTP_IPV6_V6ONLY(inp6)) {
1026                 /*
1027                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
1028                  * addr or v4-mapped addr
1029                  */
1030                 if (addr->sa_family == AF_INET) {
1031                         SCTP_INP_RUNLOCK(inp);
1032                         SCTP_ASOC_CREATE_UNLOCK(inp);
1033                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1034                         return (EINVAL);
1035                 }
1036                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1037                         SCTP_INP_RUNLOCK(inp);
1038                         SCTP_ASOC_CREATE_UNLOCK(inp);
1039                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1040                         return (EINVAL);
1041                 }
1042         }
1043         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1044                 if (!MODULE_GLOBAL(ip6_v6only)) {
1045                         /* convert v4-mapped into v4 addr */
1046                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
1047                         addr = (struct sockaddr *)&ss;
1048                 } else {
1049                         /* mapped addresses aren't enabled */
1050                         SCTP_INP_RUNLOCK(inp);
1051                         SCTP_ASOC_CREATE_UNLOCK(inp);
1052                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1053                         return (EINVAL);
1054                 }
1055         }
1056 #endif                          /* INET */
1057         /* Now do we connect? */
1058         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1059                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1060                 if (stcb) {
1061                         SCTP_TCB_UNLOCK(stcb);
1062                 }
1063                 SCTP_INP_RUNLOCK(inp);
1064         } else {
1065                 SCTP_INP_RUNLOCK(inp);
1066                 SCTP_INP_WLOCK(inp);
1067                 SCTP_INP_INCR_REF(inp);
1068                 SCTP_INP_WUNLOCK(inp);
1069                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
1070                 if (stcb == NULL) {
1071                         SCTP_INP_WLOCK(inp);
1072                         SCTP_INP_DECR_REF(inp);
1073                         SCTP_INP_WUNLOCK(inp);
1074                 }
1075         }
1076
1077         if (stcb != NULL) {
1078                 /* Already have or am bring up an association */
1079                 SCTP_ASOC_CREATE_UNLOCK(inp);
1080                 SCTP_TCB_UNLOCK(stcb);
1081                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
1082                 return (EALREADY);
1083         }
1084         /* We are GOOD to go */
1085         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
1086         SCTP_ASOC_CREATE_UNLOCK(inp);
1087         if (stcb == NULL) {
1088                 /* Gak! no memory */
1089                 return (error);
1090         }
1091         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
1092                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1093                 /* Set the connected flag so we can queue data */
1094                 soisconnecting(so);
1095         }
1096         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
1097         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1098
1099         /* initialize authentication parameters for the assoc */
1100         sctp_initialize_auth_params(inp, stcb);
1101
1102         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
1103         SCTP_TCB_UNLOCK(stcb);
1104         return (error);
1105 }
1106
1107 static int
1108 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
1109 {
1110         struct sockaddr_in6 *sin6;
1111         struct sctp_inpcb *inp;
1112         uint32_t vrf_id;
1113         struct sctp_ifa *sctp_ifa;
1114
1115         int error;
1116
1117         /*
1118          * Do the malloc first in case it blocks.
1119          */
1120         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
1121         if (sin6 == NULL)
1122                 return (ENOMEM);
1123         sin6->sin6_family = AF_INET6;
1124         sin6->sin6_len = sizeof(*sin6);
1125
1126         inp = (struct sctp_inpcb *)so->so_pcb;
1127         if (inp == NULL) {
1128                 SCTP_FREE_SONAME(sin6);
1129                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1130                 return (ECONNRESET);
1131         }
1132         SCTP_INP_RLOCK(inp);
1133         sin6->sin6_port = inp->sctp_lport;
1134         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1135                 /* For the bound all case you get back 0 */
1136                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1137                         struct sctp_tcb *stcb;
1138                         struct sockaddr_in6 *sin_a6;
1139                         struct sctp_nets *net;
1140                         int fnd;
1141
1142                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1143                         if (stcb == NULL) {
1144                                 goto notConn6;
1145                         }
1146                         fnd = 0;
1147                         sin_a6 = NULL;
1148                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1149                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1150                                 if (sin_a6 == NULL)
1151                                         /* this will make coverity happy */
1152                                         continue;
1153
1154                                 if (sin_a6->sin6_family == AF_INET6) {
1155                                         fnd = 1;
1156                                         break;
1157                                 }
1158                         }
1159                         if ((!fnd) || (sin_a6 == NULL)) {
1160                                 /* punt */
1161                                 goto notConn6;
1162                         }
1163                         vrf_id = inp->def_vrf_id;
1164                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1165                         if (sctp_ifa) {
1166                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1167                         }
1168                 } else {
1169                         /* For the bound all case you get back 0 */
1170         notConn6:
1171                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1172                 }
1173         } else {
1174                 /* Take the first IPv6 address in the list */
1175                 struct sctp_laddr *laddr;
1176                 int fnd = 0;
1177
1178                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1179                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1180                                 struct sockaddr_in6 *sin_a;
1181
1182                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1183                                 sin6->sin6_addr = sin_a->sin6_addr;
1184                                 fnd = 1;
1185                                 break;
1186                         }
1187                 }
1188                 if (!fnd) {
1189                         SCTP_FREE_SONAME(sin6);
1190                         SCTP_INP_RUNLOCK(inp);
1191                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1192                         return (ENOENT);
1193                 }
1194         }
1195         SCTP_INP_RUNLOCK(inp);
1196         /* Scoping things for v6 */
1197         if ((error = sa6_recoverscope(sin6)) != 0) {
1198                 SCTP_FREE_SONAME(sin6);
1199                 return (error);
1200         }
1201         (*addr) = (struct sockaddr *)sin6;
1202         return (0);
1203 }
1204
1205 static int
1206 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1207 {
1208         struct sockaddr_in6 *sin6;
1209         int fnd;
1210         struct sockaddr_in6 *sin_a6;
1211         struct sctp_inpcb *inp;
1212         struct sctp_tcb *stcb;
1213         struct sctp_nets *net;
1214         int error;
1215
1216         /* Do the malloc first in case it blocks. */
1217         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1218         if (sin6 == NULL)
1219                 return (ENOMEM);
1220         sin6->sin6_family = AF_INET6;
1221         sin6->sin6_len = sizeof(*sin6);
1222
1223         inp = (struct sctp_inpcb *)so->so_pcb;
1224         if ((inp == NULL) ||
1225             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1226                 /* UDP type and listeners will drop out here */
1227                 SCTP_FREE_SONAME(sin6);
1228                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1229                 return (ENOTCONN);
1230         }
1231         SCTP_INP_RLOCK(inp);
1232         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1233         if (stcb) {
1234                 SCTP_TCB_LOCK(stcb);
1235         }
1236         SCTP_INP_RUNLOCK(inp);
1237         if (stcb == NULL) {
1238                 SCTP_FREE_SONAME(sin6);
1239                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1240                 return (ECONNRESET);
1241         }
1242         fnd = 0;
1243         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1244                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1245                 if (sin_a6->sin6_family == AF_INET6) {
1246                         fnd = 1;
1247                         sin6->sin6_port = stcb->rport;
1248                         sin6->sin6_addr = sin_a6->sin6_addr;
1249                         break;
1250                 }
1251         }
1252         SCTP_TCB_UNLOCK(stcb);
1253         if (!fnd) {
1254                 /* No IPv4 address */
1255                 SCTP_FREE_SONAME(sin6);
1256                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1257                 return (ENOENT);
1258         }
1259         if ((error = sa6_recoverscope(sin6)) != 0)
1260                 return (error);
1261         *addr = (struct sockaddr *)sin6;
1262         return (0);
1263 }
1264
1265 static int
1266 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1267 {
1268 #ifdef INET
1269         struct sockaddr *addr;
1270
1271 #endif
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_getaddr(so, nam);
1281 #ifdef INET
1282         if (error) {
1283                 /* try v4 next if v6 failed */
1284                 error = sctp_ingetaddr(so, nam);
1285                 if (error) {
1286                         return (error);
1287                 }
1288                 addr = *nam;
1289                 /* if I'm V6ONLY, convert it to v4-mapped */
1290                 if (SCTP_IPV6_V6ONLY(inp6)) {
1291                         struct sockaddr_in6 sin6;
1292
1293                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1294                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1295                 }
1296         }
1297 #endif
1298         return (error);
1299 }
1300
1301
1302 static int
1303 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1304 {
1305 #ifdef INET
1306         struct sockaddr *addr;
1307
1308 #endif
1309         struct in6pcb *inp6 = sotoin6pcb(so);
1310         int error;
1311
1312         if (inp6 == NULL) {
1313                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1314                 return (EINVAL);
1315         }
1316         /* allow v6 addresses precedence */
1317         error = sctp6_peeraddr(so, nam);
1318 #ifdef INET
1319         if (error) {
1320                 /* try v4 next if v6 failed */
1321                 error = sctp_peeraddr(so, nam);
1322                 if (error) {
1323                         return (error);
1324                 }
1325                 addr = *nam;
1326                 /* if I'm V6ONLY, convert it to v4-mapped */
1327                 if (SCTP_IPV6_V6ONLY(inp6)) {
1328                         struct sockaddr_in6 sin6;
1329
1330                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1331                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1332                 }
1333         }
1334 #endif
1335         return (error);
1336 }
1337
1338 struct pr_usrreqs sctp6_usrreqs = {
1339         .pru_abort = sctp6_abort,
1340         .pru_accept = sctp_accept,
1341         .pru_attach = sctp6_attach,
1342         .pru_bind = sctp6_bind,
1343         .pru_connect = sctp6_connect,
1344         .pru_control = in6_control,
1345         .pru_close = sctp6_close,
1346         .pru_detach = sctp6_close,
1347         .pru_sopoll = sopoll_generic,
1348         .pru_flush = sctp_flush,
1349         .pru_disconnect = sctp6_disconnect,
1350         .pru_listen = sctp_listen,
1351         .pru_peeraddr = sctp6_getpeeraddr,
1352         .pru_send = sctp6_send,
1353         .pru_shutdown = sctp_shutdown,
1354         .pru_sockaddr = sctp6_in6getaddr,
1355         .pru_sosend = sctp_sosend,
1356         .pru_soreceive = sctp_soreceive
1357 };
1358
1359 #endif