The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/sctp6_usrreq.c

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2011, 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 /*      $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $      */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/8.3/sys/netinet6/sctp6_usrreq.c 231496 2012-02-11 01:05:41Z tuexen $");
   36 
   37 #include <netinet/sctp_os.h>
   38 #include <sys/proc.h>
   39 #include <netinet/sctp_pcb.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctp_var.h>
   42 #if defined(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 #if defined(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 
   89 #if !defined(SCTP_WITH_NO_CSUM)
   90         uint32_t check, calc_check;
   91 
   92 #endif
   93         int off = *offp;
   94         uint16_t port = 0;
   95 
   96         /* get the VRF and table id's */
   97         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
   98                 SCTP_RELEASE_PKT(*i_pak);
   99                 return (-1);
  100         }
  101         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  102         pkt_len = SCTP_HEADER_LEN((*i_pak));
  103 
  104 #ifdef  SCTP_PACKET_LOGGING
  105         sctp_packet_log(m, pkt_len);
  106 #endif
  107         ip6 = mtod(m, struct ip6_hdr *);
  108         /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
  109         IP6_EXTHDR_GET(sh, struct sctphdr *, m, off,
  110             (int)(sizeof(*sh) + sizeof(*ch)));
  111         if (sh == NULL) {
  112                 SCTP_STAT_INCR(sctps_hdrops);
  113                 return (IPPROTO_DONE);
  114         }
  115         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
  116         iphlen = off;
  117         offset = iphlen + sizeof(*sh) + sizeof(*ch);
  118         SCTPDBG(SCTP_DEBUG_INPUT1,
  119             "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen);
  120 
  121 
  122 #if defined(NFAITH) && NFAITH > 0
  123 
  124         if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
  125                 /* XXX send icmp6 host/port unreach? */
  126                 goto bad;
  127         }
  128 #endif                          /* NFAITH defined and > 0 */
  129         SCTP_STAT_INCR(sctps_recvpackets);
  130         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
  131         SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n",
  132             iphlen, pkt_len);
  133         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  134                 /* No multi-cast support in SCTP */
  135                 goto bad;
  136         }
  137         /* destination port of 0 is illegal, based on RFC2960. */
  138         if (sh->dest_port == 0)
  139                 goto bad;
  140 
  141         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  142             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
  143             m->m_pkthdr.len,
  144             if_name(m->m_pkthdr.rcvif),
  145             m->m_pkthdr.csum_flags);
  146 #if defined(SCTP_WITH_NO_CSUM)
  147         SCTP_STAT_INCR(sctps_recvnocrc);
  148 #else
  149         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
  150                 SCTP_STAT_INCR(sctps_recvhwcrc);
  151                 goto sctp_skip_csum;
  152         }
  153         check = sh->checksum;   /* save incoming checksum */
  154         if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) &&
  155             (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) {
  156                 SCTP_STAT_INCR(sctps_recvnocrc);
  157                 goto sctp_skip_csum;
  158         }
  159         sh->checksum = 0;       /* prepare for calc */
  160         calc_check = sctp_calculate_cksum(m, iphlen);
  161         SCTP_STAT_INCR(sctps_recvswcrc);
  162         if (calc_check != check) {
  163                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p phlen:%d\n",
  164                     calc_check, check, m, iphlen);
  165                 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
  166                     sh, ch, &in6p, &net, vrf_id);
  167                 if ((net) && (port)) {
  168                         if (net->port == 0) {
  169                                 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
  170                         }
  171                         net->port = port;
  172                 }
  173                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
  174                         net->flowid = m->m_pkthdr.flowid;
  175 #ifdef INVARIANTS
  176                         net->flowidset = 1;
  177 #endif
  178                 }
  179                 /* in6p's ref-count increased && stcb locked */
  180                 if ((in6p) && (stcb)) {
  181                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
  182                         sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
  183                 } else if ((in6p != NULL) && (stcb == NULL)) {
  184                         refcount_up = 1;
  185                 }
  186                 SCTP_STAT_INCR(sctps_badsum);
  187                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
  188                 goto bad;
  189         }
  190         sh->checksum = calc_check;
  191 
  192 sctp_skip_csum:
  193 #endif
  194         net = NULL;
  195         /*
  196          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
  197          * IP/SCTP/first chunk header...
  198          */
  199         stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
  200             sh, ch, &in6p, &net, vrf_id);
  201         if ((net) && (port)) {
  202                 if (net->port == 0) {
  203                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
  204                 }
  205                 net->port = port;
  206         }
  207         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
  208                 net->flowid = m->m_pkthdr.flowid;
  209 #ifdef INVARIANTS
  210                 net->flowidset = 1;
  211 #endif
  212         }
  213         /* in6p's ref-count increased */
  214         if (in6p == NULL) {
  215                 struct sctp_init_chunk *init_chk, chunk_buf;
  216 
  217                 SCTP_STAT_INCR(sctps_noport);
  218                 if (ch->chunk_type == SCTP_INITIATION) {
  219                         /*
  220                          * we do a trick here to get the INIT tag, dig in
  221                          * and get the tag from the INIT and put it in the
  222                          * common header.
  223                          */
  224                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
  225                             iphlen + sizeof(*sh), sizeof(*init_chk),
  226                             (uint8_t *) & chunk_buf);
  227                         if (init_chk)
  228                                 sh->v_tag = init_chk->init.initiate_tag;
  229                         else
  230                                 sh->v_tag = 0;
  231                 }
  232                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
  233                         sctp_send_shutdown_complete2(m, sh, vrf_id, port);
  234                         goto bad;
  235                 }
  236                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
  237                         goto bad;
  238                 }
  239                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
  240                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
  241                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
  242                             (ch->chunk_type != SCTP_INIT))) {
  243                                 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
  244                         }
  245                 }
  246                 goto bad;
  247         } else if (stcb == NULL) {
  248                 refcount_up = 1;
  249         }
  250 #ifdef IPSEC
  251         /*
  252          * Check AH/ESP integrity.
  253          */
  254         in6p_ip = (struct inpcb *)in6p;
  255         if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) {
  256 /* XXX */
  257                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
  258                 goto bad;
  259         }
  260 #endif                          /* IPSEC */
  261 
  262         /*
  263          * CONTROL chunk processing
  264          */
  265         offset -= sizeof(*ch);
  266         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
  267 
  268         /* Length now holds the total packet length payload + iphlen */
  269         length = ntohs(ip6->ip6_plen) + iphlen;
  270 
  271         /* sa_ignore NO_NULL_CHK */
  272         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
  273             in6p, stcb, net, ecn_bits, vrf_id, port);
  274         /* inp's ref-count reduced && stcb unlocked */
  275         /* XXX this stuff below gets moved to appropriate parts later... */
  276         if (m)
  277                 sctp_m_freem(m);
  278         if ((in6p) && refcount_up) {
  279                 /* reduce ref-count */
  280                 SCTP_INP_WLOCK(in6p);
  281                 SCTP_INP_DECR_REF(in6p);
  282                 SCTP_INP_WUNLOCK(in6p);
  283         }
  284         return (IPPROTO_DONE);
  285 
  286 bad:
  287         if (stcb) {
  288                 SCTP_TCB_UNLOCK(stcb);
  289         }
  290         if ((in6p) && refcount_up) {
  291                 /* reduce ref-count */
  292                 SCTP_INP_WLOCK(in6p);
  293                 SCTP_INP_DECR_REF(in6p);
  294                 SCTP_INP_WUNLOCK(in6p);
  295         }
  296         if (m)
  297                 sctp_m_freem(m);
  298         return (IPPROTO_DONE);
  299 }
  300 
  301 
  302 static void
  303 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
  304     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
  305 {
  306         uint32_t nxtsz;
  307 
  308         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
  309             (icmp6 == NULL) || (sh == NULL)) {
  310                 goto out;
  311         }
  312         /* First do we even look at it? */
  313         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
  314                 goto out;
  315 
  316         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
  317                 /* not PACKET TO BIG */
  318                 goto out;
  319         }
  320         /*
  321          * ok we need to look closely. We could even get smarter and look at
  322          * anyone that we sent to in case we get a different ICMP that tells
  323          * us there is no way to reach a host, but for this impl, all we
  324          * care about is MTU discovery.
  325          */
  326         nxtsz = ntohl(icmp6->icmp6_mtu);
  327         /* Stop any PMTU timer */
  328         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
  329 
  330         /* Adjust destination size limit */
  331         if (net->mtu > nxtsz) {
  332                 net->mtu = nxtsz;
  333                 if (net->port) {
  334                         net->mtu -= sizeof(struct udphdr);
  335                 }
  336         }
  337         /* now what about the ep? */
  338         if (stcb->asoc.smallest_mtu > nxtsz) {
  339                 struct sctp_tmit_chunk *chk;
  340 
  341                 /* Adjust that too */
  342                 stcb->asoc.smallest_mtu = nxtsz;
  343                 /* now off to subtract IP_DF flag if needed */
  344 
  345                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
  346                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
  347                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  348                         }
  349                 }
  350                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  351                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
  352                                 /*
  353                                  * For this guy we also mark for immediate
  354                                  * resend since we sent to big of chunk
  355                                  */
  356                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  357                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
  358                                         stcb->asoc.sent_queue_retran_cnt++;
  359                                 chk->sent = SCTP_DATAGRAM_RESEND;
  360                                 chk->rec.data.doing_fast_retransmit = 0;
  361 
  362                                 chk->sent = SCTP_DATAGRAM_RESEND;
  363                                 /* Clear any time so NO RTT is being done */
  364                                 chk->sent_rcv_time.tv_sec = 0;
  365                                 chk->sent_rcv_time.tv_usec = 0;
  366                                 stcb->asoc.total_flight -= chk->send_size;
  367                                 net->flight_size -= chk->send_size;
  368                         }
  369                 }
  370         }
  371         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
  372 out:
  373         if (stcb) {
  374                 SCTP_TCB_UNLOCK(stcb);
  375         }
  376 }
  377 
  378 
  379 void
  380 sctp6_notify(struct sctp_inpcb *inp,
  381     struct icmp6_hdr *icmph,
  382     struct sctphdr *sh,
  383     struct sockaddr *to,
  384     struct sctp_tcb *stcb,
  385     struct sctp_nets *net)
  386 {
  387 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  388         struct socket *so;
  389 
  390 #endif
  391         /* protection */
  392         int reason;
  393 
  394 
  395         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
  396             (sh == NULL) || (to == NULL)) {
  397                 if (stcb)
  398                         SCTP_TCB_UNLOCK(stcb);
  399                 return;
  400         }
  401         /* First job is to verify the vtag matches what I would send */
  402         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
  403                 SCTP_TCB_UNLOCK(stcb);
  404                 return;
  405         }
  406         if (icmph->icmp6_type != ICMP_UNREACH) {
  407                 /* We only care about unreachable */
  408                 SCTP_TCB_UNLOCK(stcb);
  409                 return;
  410         }
  411         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
  412             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
  413             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
  414             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
  415             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
  416             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
  417             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
  418             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
  419 
  420                 /*
  421                  * Hmm reachablity problems we must examine closely. If its
  422                  * not reachable, we may have lost a network. Or if there is
  423                  * NO protocol at the other end named SCTP. well we consider
  424                  * it a OOTB abort.
  425                  */
  426                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
  427                         /* Ok that destination is NOT reachable */
  428                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
  429                         net->dest_state &= ~SCTP_ADDR_PF;
  430                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  431                             stcb, SCTP_FAILED_THRESHOLD,
  432                             (void *)net, SCTP_SO_NOT_LOCKED);
  433                 }
  434                 SCTP_TCB_UNLOCK(stcb);
  435         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
  436             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
  437                 /*
  438                  * Here the peer is either playing tricks on us, including
  439                  * an address that belongs to someone who does not support
  440                  * SCTP OR was a userland implementation that shutdown and
  441                  * now is dead. In either case treat it like a OOTB abort
  442                  * with no TCB
  443                  */
  444                 reason = SCTP_PEER_FAULTY;
  445                 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED);
  446 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  447                 so = SCTP_INP_SO(inp);
  448                 atomic_add_int(&stcb->asoc.refcnt, 1);
  449                 SCTP_TCB_UNLOCK(stcb);
  450                 SCTP_SOCKET_LOCK(so, 1);
  451                 SCTP_TCB_LOCK(stcb);
  452                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  453 #endif
  454                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
  455 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  456                 SCTP_SOCKET_UNLOCK(so, 1);
  457                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
  458 #endif
  459                 /* no need to unlock here, since the TCB is gone */
  460         } else {
  461                 SCTP_TCB_UNLOCK(stcb);
  462         }
  463 }
  464 
  465 
  466 
  467 void
  468 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
  469 {
  470         struct sctphdr sh;
  471         struct ip6ctlparam *ip6cp = NULL;
  472         uint32_t vrf_id;
  473 
  474         vrf_id = SCTP_DEFAULT_VRFID;
  475 
  476         if (pktdst->sa_family != AF_INET6 ||
  477             pktdst->sa_len != sizeof(struct sockaddr_in6))
  478                 return;
  479 
  480         if ((unsigned)cmd >= PRC_NCMDS)
  481                 return;
  482         if (PRC_IS_REDIRECT(cmd)) {
  483                 d = NULL;
  484         } else if (inet6ctlerrmap[cmd] == 0) {
  485                 return;
  486         }
  487         /* if the parameter is from icmp6, decode it. */
  488         if (d != NULL) {
  489                 ip6cp = (struct ip6ctlparam *)d;
  490         } else {
  491                 ip6cp = (struct ip6ctlparam *)NULL;
  492         }
  493 
  494         if (ip6cp) {
  495                 /*
  496                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
  497                  * valid.
  498                  */
  499                 /* check if we can safely examine src and dst ports */
  500                 struct sctp_inpcb *inp = NULL;
  501                 struct sctp_tcb *stcb = NULL;
  502                 struct sctp_nets *net = NULL;
  503                 struct sockaddr_in6 final;
  504 
  505                 if (ip6cp->ip6c_m == NULL)
  506                         return;
  507 
  508                 bzero(&sh, sizeof(sh));
  509                 bzero(&final, sizeof(final));
  510                 inp = NULL;
  511                 net = NULL;
  512                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
  513                     (caddr_t)&sh);
  514                 ip6cp->ip6c_src->sin6_port = sh.src_port;
  515                 final.sin6_len = sizeof(final);
  516                 final.sin6_family = AF_INET6;
  517                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
  518                 final.sin6_port = sh.dest_port;
  519                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
  520                     (struct sockaddr *)&final,
  521                     &inp, &net, 1, vrf_id);
  522                 /* inp's ref-count increased && stcb locked */
  523                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
  524                         if (cmd == PRC_MSGSIZE) {
  525                                 sctp6_notify_mbuf(inp,
  526                                     ip6cp->ip6c_icmp6,
  527                                     &sh,
  528                                     stcb,
  529                                     net);
  530                                 /* inp's ref-count reduced && stcb unlocked */
  531                         } else {
  532                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
  533                                     (struct sockaddr *)&final,
  534                                     stcb, net);
  535                                 /* inp's ref-count reduced && stcb unlocked */
  536                         }
  537                 } else {
  538                         if (PRC_IS_REDIRECT(cmd) && inp) {
  539                                 in6_rtchange((struct in6pcb *)inp,
  540                                     inet6ctlerrmap[cmd]);
  541                         }
  542                         if (inp) {
  543                                 /* reduce inp's ref-count */
  544                                 SCTP_INP_WLOCK(inp);
  545                                 SCTP_INP_DECR_REF(inp);
  546                                 SCTP_INP_WUNLOCK(inp);
  547                         }
  548                         if (stcb)
  549                                 SCTP_TCB_UNLOCK(stcb);
  550                 }
  551         }
  552 }
  553 
  554 /*
  555  * this routine can probably be collasped into the one in sctp_userreq.c
  556  * since they do the same thing and now we lookup with a sockaddr
  557  */
  558 static int
  559 sctp6_getcred(SYSCTL_HANDLER_ARGS)
  560 {
  561         struct xucred xuc;
  562         struct sockaddr_in6 addrs[2];
  563         struct sctp_inpcb *inp;
  564         struct sctp_nets *net;
  565         struct sctp_tcb *stcb;
  566         int error;
  567         uint32_t vrf_id;
  568 
  569         vrf_id = SCTP_DEFAULT_VRFID;
  570 
  571         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  572         if (error)
  573                 return (error);
  574 
  575         if (req->newlen != sizeof(addrs)) {
  576                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  577                 return (EINVAL);
  578         }
  579         if (req->oldlen != sizeof(struct ucred)) {
  580                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  581                 return (EINVAL);
  582         }
  583         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  584         if (error)
  585                 return (error);
  586 
  587         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
  588             sin6tosa(&addrs[1]),
  589             &inp, &net, 1, vrf_id);
  590         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
  591                 if ((inp != NULL) && (stcb == NULL)) {
  592                         /* reduce ref-count */
  593                         SCTP_INP_WLOCK(inp);
  594                         SCTP_INP_DECR_REF(inp);
  595                         goto cred_can_cont;
  596                 }
  597                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  598                 error = ENOENT;
  599                 goto out;
  600         }
  601         SCTP_TCB_UNLOCK(stcb);
  602         /*
  603          * We use the write lock here, only since in the error leg we need
  604          * it. If we used RLOCK, then we would have to
  605          * wlock/decr/unlock/rlock. Which in theory could create a hole.
  606          * Better to use higher wlock.
  607          */
  608         SCTP_INP_WLOCK(inp);
  609 cred_can_cont:
  610         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
  611         if (error) {
  612                 SCTP_INP_WUNLOCK(inp);
  613                 goto out;
  614         }
  615         cru2x(inp->sctp_socket->so_cred, &xuc);
  616         SCTP_INP_WUNLOCK(inp);
  617         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  618 out:
  619         return (error);
  620 }
  621 
  622 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
  623     0, 0,
  624     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
  625 
  626 
  627 /* This is the same as the sctp_abort() could be made common */
  628 static void
  629 sctp6_abort(struct socket *so)
  630 {
  631         struct sctp_inpcb *inp;
  632         uint32_t flags;
  633 
  634         inp = (struct sctp_inpcb *)so->so_pcb;
  635         if (inp == 0) {
  636                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  637                 return;
  638         }
  639 sctp_must_try_again:
  640         flags = inp->sctp_flags;
  641 #ifdef SCTP_LOG_CLOSING
  642         sctp_log_closing(inp, NULL, 17);
  643 #endif
  644         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
  645             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
  646 #ifdef SCTP_LOG_CLOSING
  647                 sctp_log_closing(inp, NULL, 16);
  648 #endif
  649                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
  650                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
  651                 SOCK_LOCK(so);
  652                 SCTP_SB_CLEAR(so->so_snd);
  653                 /*
  654                  * same for the rcv ones, they are only here for the
  655                  * accounting/select.
  656                  */
  657                 SCTP_SB_CLEAR(so->so_rcv);
  658                 /* Now null out the reference, we are completely detached. */
  659                 so->so_pcb = NULL;
  660                 SOCK_UNLOCK(so);
  661         } else {
  662                 flags = inp->sctp_flags;
  663                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
  664                         goto sctp_must_try_again;
  665                 }
  666         }
  667         return;
  668 }
  669 
  670 static int
  671 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
  672 {
  673         struct in6pcb *inp6;
  674         int error;
  675         struct sctp_inpcb *inp;
  676         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
  677 
  678         inp = (struct sctp_inpcb *)so->so_pcb;
  679         if (inp != NULL) {
  680                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  681                 return (EINVAL);
  682         }
  683         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  684                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
  685                 if (error)
  686                         return (error);
  687         }
  688         error = sctp_inpcb_alloc(so, vrf_id);
  689         if (error)
  690                 return (error);
  691         inp = (struct sctp_inpcb *)so->so_pcb;
  692         SCTP_INP_WLOCK(inp);
  693         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
  694         inp6 = (struct in6pcb *)inp;
  695 
  696         inp6->inp_vflag |= INP_IPV6;
  697         inp6->in6p_hops = -1;   /* use kernel default */
  698         inp6->in6p_cksum = -1;  /* just to be sure */
  699 #ifdef INET
  700         /*
  701          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
  702          * socket as well, because the socket may be bound to an IPv6
  703          * wildcard address, which may match an IPv4-mapped IPv6 address.
  704          */
  705         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
  706 #endif
  707         /*
  708          * Hmm what about the IPSEC stuff that is missing here but in
  709          * sctp_attach()?
  710          */
  711         SCTP_INP_WUNLOCK(inp);
  712         return (0);
  713 }
  714 
  715 static int
  716 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
  717 {
  718         struct sctp_inpcb *inp;
  719         struct in6pcb *inp6;
  720         int error;
  721 
  722         inp = (struct sctp_inpcb *)so->so_pcb;
  723         if (inp == 0) {
  724                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  725                 return (EINVAL);
  726         }
  727         if (addr) {
  728                 switch (addr->sa_family) {
  729 #ifdef INET
  730                 case AF_INET:
  731                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
  732                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  733                                 return (EINVAL);
  734                         }
  735                         break;
  736 #endif
  737 #ifdef INET6
  738                 case AF_INET6:
  739                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  740                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  741                                 return (EINVAL);
  742                         }
  743                         break;
  744 #endif
  745                 default:
  746                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  747                         return (EINVAL);
  748                 }
  749         }
  750         inp6 = (struct in6pcb *)inp;
  751         inp6->inp_vflag &= ~INP_IPV4;
  752         inp6->inp_vflag |= INP_IPV6;
  753         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
  754                 switch (addr->sa_family) {
  755 #ifdef INET
  756                 case AF_INET:
  757                         /* binding v4 addr to v6 socket, so reset flags */
  758                         inp6->inp_vflag |= INP_IPV4;
  759                         inp6->inp_vflag &= ~INP_IPV6;
  760                         break;
  761 #endif
  762 #ifdef INET6
  763                 case AF_INET6:
  764                         {
  765                                 struct sockaddr_in6 *sin6_p;
  766 
  767                                 sin6_p = (struct sockaddr_in6 *)addr;
  768 
  769                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
  770                                         inp6->inp_vflag |= INP_IPV4;
  771                                 }
  772 #ifdef INET
  773                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  774                                         struct sockaddr_in sin;
  775 
  776                                         in6_sin6_2_sin(&sin, sin6_p);
  777                                         inp6->inp_vflag |= INP_IPV4;
  778                                         inp6->inp_vflag &= ~INP_IPV6;
  779                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
  780                                         return (error);
  781                                 }
  782 #endif
  783                                 break;
  784                         }
  785 #endif
  786                 default:
  787                         break;
  788                 }
  789         } else if (addr != NULL) {
  790                 struct sockaddr_in6 *sin6_p;
  791 
  792                 /* IPV6_V6ONLY socket */
  793 #ifdef INET
  794                 if (addr->sa_family == AF_INET) {
  795                         /* can't bind v4 addr to v6 only socket! */
  796                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  797                         return (EINVAL);
  798                 }
  799 #endif
  800                 sin6_p = (struct sockaddr_in6 *)addr;
  801 
  802                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  803                         /* can't bind v4-mapped addrs either! */
  804                         /* NOTE: we don't support SIIT */
  805                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  806                         return (EINVAL);
  807                 }
  808         }
  809         error = sctp_inpcb_bind(so, addr, NULL, p);
  810         return (error);
  811 }
  812 
  813 
  814 static void
  815 sctp6_close(struct socket *so)
  816 {
  817         sctp_close(so);
  818 }
  819 
  820 /* This could be made common with sctp_detach() since they are identical */
  821 
  822 static
  823 int
  824 sctp6_disconnect(struct socket *so)
  825 {
  826         return (sctp_disconnect(so));
  827 }
  828 
  829 
  830 int
  831 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  832     struct mbuf *control, struct thread *p);
  833 
  834 
  835 static int
  836 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  837     struct mbuf *control, struct thread *p)
  838 {
  839         struct sctp_inpcb *inp;
  840         struct in6pcb *inp6;
  841 
  842 #ifdef INET
  843         struct sockaddr_in6 *sin6;
  844 
  845 #endif                          /* INET */
  846         /* No SPL needed since sctp_output does this */
  847 
  848         inp = (struct sctp_inpcb *)so->so_pcb;
  849         if (inp == NULL) {
  850                 if (control) {
  851                         SCTP_RELEASE_PKT(control);
  852                         control = NULL;
  853                 }
  854                 SCTP_RELEASE_PKT(m);
  855                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  856                 return (EINVAL);
  857         }
  858         inp6 = (struct in6pcb *)inp;
  859         /*
  860          * For the TCP model we may get a NULL addr, if we are a connected
  861          * socket thats ok.
  862          */
  863         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
  864             (addr == NULL)) {
  865                 goto connected_type;
  866         }
  867         if (addr == NULL) {
  868                 SCTP_RELEASE_PKT(m);
  869                 if (control) {
  870                         SCTP_RELEASE_PKT(control);
  871                         control = NULL;
  872                 }
  873                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
  874                 return (EDESTADDRREQ);
  875         }
  876 #ifdef INET
  877         sin6 = (struct sockaddr_in6 *)addr;
  878         if (SCTP_IPV6_V6ONLY(inp6)) {
  879                 /*
  880                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
  881                  * v4 addr or v4-mapped addr
  882                  */
  883                 if (addr->sa_family == AF_INET) {
  884                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  885                         return (EINVAL);
  886                 }
  887                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  888                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  889                         return (EINVAL);
  890                 }
  891         }
  892         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  893                 if (!MODULE_GLOBAL(ip6_v6only)) {
  894                         struct sockaddr_in sin;
  895 
  896                         /* convert v4-mapped into v4 addr and send */
  897                         in6_sin6_2_sin(&sin, sin6);
  898                         return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
  899                             control, p));
  900                 } else {
  901                         /* mapped addresses aren't enabled */
  902                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  903                         return (EINVAL);
  904                 }
  905         }
  906 #endif                          /* INET */
  907 connected_type:
  908         /* now what about control */
  909         if (control) {
  910                 if (inp->control) {
  911                         SCTP_PRINTF("huh? control set?\n");
  912                         SCTP_RELEASE_PKT(inp->control);
  913                         inp->control = NULL;
  914                 }
  915                 inp->control = control;
  916         }
  917         /* Place the data */
  918         if (inp->pkt) {
  919                 SCTP_BUF_NEXT(inp->pkt_last) = m;
  920                 inp->pkt_last = m;
  921         } else {
  922                 inp->pkt_last = inp->pkt = m;
  923         }
  924         if (
  925         /* FreeBSD and MacOSX uses a flag passed */
  926             ((flags & PRUS_MORETOCOME) == 0)
  927             ) {
  928                 /*
  929                  * note with the current version this code will only be used
  930                  * by OpenBSD, NetBSD and FreeBSD have methods for
  931                  * re-defining sosend() to use sctp_sosend().  One can
  932                  * optionaly switch back to this code (by changing back the
  933                  * defininitions but this is not advisable.
  934                  */
  935                 int ret;
  936 
  937                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
  938                 inp->pkt = NULL;
  939                 inp->control = NULL;
  940                 return (ret);
  941         } else {
  942                 return (0);
  943         }
  944 }
  945 
  946 static int
  947 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
  948 {
  949         uint32_t vrf_id;
  950         int error = 0;
  951         struct sctp_inpcb *inp;
  952         struct in6pcb *inp6;
  953         struct sctp_tcb *stcb;
  954 
  955 #ifdef INET
  956         struct sockaddr_in6 *sin6;
  957         struct sockaddr_storage ss;
  958 
  959 #endif
  960 
  961         inp6 = (struct in6pcb *)so->so_pcb;
  962         inp = (struct sctp_inpcb *)so->so_pcb;
  963         if (inp == 0) {
  964                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  965                 return (ECONNRESET);    /* I made the same as TCP since we are
  966                                          * not setup? */
  967         }
  968         if (addr == NULL) {
  969                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  970                 return (EINVAL);
  971         }
  972         switch (addr->sa_family) {
  973 #ifdef INET
  974         case AF_INET:
  975                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
  976                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  977                         return (EINVAL);
  978                 }
  979                 break;
  980 #endif
  981 #ifdef INET6
  982         case AF_INET6:
  983                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  984                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  985                         return (EINVAL);
  986                 }
  987                 break;
  988 #endif
  989         default:
  990                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  991                 return (EINVAL);
  992         }
  993 
  994         vrf_id = inp->def_vrf_id;
  995         SCTP_ASOC_CREATE_LOCK(inp);
  996         SCTP_INP_RLOCK(inp);
  997         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
  998             SCTP_PCB_FLAGS_UNBOUND) {
  999                 /* Bind a ephemeral port */
 1000                 SCTP_INP_RUNLOCK(inp);
 1001                 error = sctp6_bind(so, NULL, p);
 1002                 if (error) {
 1003                         SCTP_ASOC_CREATE_UNLOCK(inp);
 1004 
 1005                         return (error);
 1006                 }
 1007                 SCTP_INP_RLOCK(inp);
 1008         }
 1009         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 1010             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 1011                 /* We are already connected AND the TCP model */
 1012                 SCTP_INP_RUNLOCK(inp);
 1013                 SCTP_ASOC_CREATE_UNLOCK(inp);
 1014                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 1015                 return (EADDRINUSE);
 1016         }
 1017 #ifdef INET
 1018         sin6 = (struct sockaddr_in6 *)addr;
 1019         if (SCTP_IPV6_V6ONLY(inp6)) {
 1020                 /*
 1021                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 1022                  * addr or v4-mapped addr
 1023                  */
 1024                 if (addr->sa_family == AF_INET) {
 1025                         SCTP_INP_RUNLOCK(inp);
 1026                         SCTP_ASOC_CREATE_UNLOCK(inp);
 1027                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1028                         return (EINVAL);
 1029                 }
 1030                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 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         }
 1037         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 1038                 if (!MODULE_GLOBAL(ip6_v6only)) {
 1039                         /* convert v4-mapped into v4 addr */
 1040                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
 1041                         addr = (struct sockaddr *)&ss;
 1042                 } else {
 1043                         /* mapped addresses aren't enabled */
 1044                         SCTP_INP_RUNLOCK(inp);
 1045                         SCTP_ASOC_CREATE_UNLOCK(inp);
 1046                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1047                         return (EINVAL);
 1048                 }
 1049         }
 1050 #endif                          /* INET */
 1051         /* Now do we connect? */
 1052         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 1053                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1054                 if (stcb) {
 1055                         SCTP_TCB_UNLOCK(stcb);
 1056                 }
 1057                 SCTP_INP_RUNLOCK(inp);
 1058         } else {
 1059                 SCTP_INP_RUNLOCK(inp);
 1060                 SCTP_INP_WLOCK(inp);
 1061                 SCTP_INP_INCR_REF(inp);
 1062                 SCTP_INP_WUNLOCK(inp);
 1063                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 1064                 if (stcb == NULL) {
 1065                         SCTP_INP_WLOCK(inp);
 1066                         SCTP_INP_DECR_REF(inp);
 1067                         SCTP_INP_WUNLOCK(inp);
 1068                 }
 1069         }
 1070 
 1071         if (stcb != NULL) {
 1072                 /* Already have or am bring up an association */
 1073                 SCTP_ASOC_CREATE_UNLOCK(inp);
 1074                 SCTP_TCB_UNLOCK(stcb);
 1075                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 1076                 return (EALREADY);
 1077         }
 1078         /* We are GOOD to go */
 1079         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
 1080         SCTP_ASOC_CREATE_UNLOCK(inp);
 1081         if (stcb == NULL) {
 1082                 /* Gak! no memory */
 1083                 return (error);
 1084         }
 1085         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 1086                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 1087                 /* Set the connected flag so we can queue data */
 1088                 soisconnecting(so);
 1089         }
 1090         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 1091         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 1092 
 1093         /* initialize authentication parameters for the assoc */
 1094         sctp_initialize_auth_params(inp, stcb);
 1095 
 1096         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 1097         SCTP_TCB_UNLOCK(stcb);
 1098         return (error);
 1099 }
 1100 
 1101 static int
 1102 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 1103 {
 1104         struct sockaddr_in6 *sin6;
 1105         struct sctp_inpcb *inp;
 1106         uint32_t vrf_id;
 1107         struct sctp_ifa *sctp_ifa;
 1108 
 1109         int error;
 1110 
 1111         /*
 1112          * Do the malloc first in case it blocks.
 1113          */
 1114         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 1115         if (sin6 == NULL)
 1116                 return (ENOMEM);
 1117         sin6->sin6_family = AF_INET6;
 1118         sin6->sin6_len = sizeof(*sin6);
 1119 
 1120         inp = (struct sctp_inpcb *)so->so_pcb;
 1121         if (inp == NULL) {
 1122                 SCTP_FREE_SONAME(sin6);
 1123                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 1124                 return (ECONNRESET);
 1125         }
 1126         SCTP_INP_RLOCK(inp);
 1127         sin6->sin6_port = inp->sctp_lport;
 1128         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 1129                 /* For the bound all case you get back 0 */
 1130                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 1131                         struct sctp_tcb *stcb;
 1132                         struct sockaddr_in6 *sin_a6;
 1133                         struct sctp_nets *net;
 1134                         int fnd;
 1135 
 1136                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1137                         if (stcb == NULL) {
 1138                                 goto notConn6;
 1139                         }
 1140                         fnd = 0;
 1141                         sin_a6 = NULL;
 1142                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 1143                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1144                                 if (sin_a6 == NULL)
 1145                                         /* this will make coverity happy */
 1146                                         continue;
 1147 
 1148                                 if (sin_a6->sin6_family == AF_INET6) {
 1149                                         fnd = 1;
 1150                                         break;
 1151                                 }
 1152                         }
 1153                         if ((!fnd) || (sin_a6 == NULL)) {
 1154                                 /* punt */
 1155                                 goto notConn6;
 1156                         }
 1157                         vrf_id = inp->def_vrf_id;
 1158                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
 1159                         if (sctp_ifa) {
 1160                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
 1161                         }
 1162                 } else {
 1163                         /* For the bound all case you get back 0 */
 1164         notConn6:
 1165                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
 1166                 }
 1167         } else {
 1168                 /* Take the first IPv6 address in the list */
 1169                 struct sctp_laddr *laddr;
 1170                 int fnd = 0;
 1171 
 1172                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 1173                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
 1174                                 struct sockaddr_in6 *sin_a;
 1175 
 1176                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
 1177                                 sin6->sin6_addr = sin_a->sin6_addr;
 1178                                 fnd = 1;
 1179                                 break;
 1180                         }
 1181                 }
 1182                 if (!fnd) {
 1183                         SCTP_FREE_SONAME(sin6);
 1184                         SCTP_INP_RUNLOCK(inp);
 1185                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1186                         return (ENOENT);
 1187                 }
 1188         }
 1189         SCTP_INP_RUNLOCK(inp);
 1190         /* Scoping things for v6 */
 1191         if ((error = sa6_recoverscope(sin6)) != 0) {
 1192                 SCTP_FREE_SONAME(sin6);
 1193                 return (error);
 1194         }
 1195         (*addr) = (struct sockaddr *)sin6;
 1196         return (0);
 1197 }
 1198 
 1199 static int
 1200 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
 1201 {
 1202         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr;
 1203         int fnd;
 1204         struct sockaddr_in6 *sin_a6;
 1205         struct sctp_inpcb *inp;
 1206         struct sctp_tcb *stcb;
 1207         struct sctp_nets *net;
 1208         int error;
 1209 
 1210         /* Do the malloc first in case it blocks. */
 1211         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1212         if (sin6 == NULL)
 1213                 return (ENOMEM);
 1214         sin6->sin6_family = AF_INET6;
 1215         sin6->sin6_len = sizeof(*sin6);
 1216 
 1217         inp = (struct sctp_inpcb *)so->so_pcb;
 1218         if ((inp == NULL) ||
 1219             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 1220                 /* UDP type and listeners will drop out here */
 1221                 SCTP_FREE_SONAME(sin6);
 1222                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
 1223                 return (ENOTCONN);
 1224         }
 1225         SCTP_INP_RLOCK(inp);
 1226         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1227         if (stcb) {
 1228                 SCTP_TCB_LOCK(stcb);
 1229         }
 1230         SCTP_INP_RUNLOCK(inp);
 1231         if (stcb == NULL) {
 1232                 SCTP_FREE_SONAME(sin6);
 1233                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 1234                 return (ECONNRESET);
 1235         }
 1236         fnd = 0;
 1237         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 1238                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1239                 if (sin_a6->sin6_family == AF_INET6) {
 1240                         fnd = 1;
 1241                         sin6->sin6_port = stcb->rport;
 1242                         sin6->sin6_addr = sin_a6->sin6_addr;
 1243                         break;
 1244                 }
 1245         }
 1246         SCTP_TCB_UNLOCK(stcb);
 1247         if (!fnd) {
 1248                 /* No IPv4 address */
 1249                 SCTP_FREE_SONAME(sin6);
 1250                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1251                 return (ENOENT);
 1252         }
 1253         if ((error = sa6_recoverscope(sin6)) != 0)
 1254                 return (error);
 1255         *addr = (struct sockaddr *)sin6;
 1256         return (0);
 1257 }
 1258 
 1259 static int
 1260 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
 1261 {
 1262 #ifdef INET
 1263         struct sockaddr *addr;
 1264 
 1265 #endif
 1266         struct in6pcb *inp6 = sotoin6pcb(so);
 1267         int error;
 1268 
 1269         if (inp6 == NULL) {
 1270                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1271                 return (EINVAL);
 1272         }
 1273         /* allow v6 addresses precedence */
 1274         error = sctp6_getaddr(so, nam);
 1275 #ifdef INET
 1276         if (error) {
 1277                 /* try v4 next if v6 failed */
 1278                 error = sctp_ingetaddr(so, nam);
 1279                 if (error) {
 1280                         return (error);
 1281                 }
 1282                 addr = *nam;
 1283                 /* if I'm V6ONLY, convert it to v4-mapped */
 1284                 if (SCTP_IPV6_V6ONLY(inp6)) {
 1285                         struct sockaddr_in6 sin6;
 1286 
 1287                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
 1288                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
 1289                 }
 1290         }
 1291 #endif
 1292         return (error);
 1293 }
 1294 
 1295 
 1296 static int
 1297 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
 1298 {
 1299 #ifdef INET
 1300         struct sockaddr *addr;
 1301 
 1302 #endif
 1303         struct in6pcb *inp6 = sotoin6pcb(so);
 1304         int error;
 1305 
 1306         if (inp6 == NULL) {
 1307                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1308                 return (EINVAL);
 1309         }
 1310         /* allow v6 addresses precedence */
 1311         error = sctp6_peeraddr(so, nam);
 1312 #ifdef INET
 1313         if (error) {
 1314                 /* try v4 next if v6 failed */
 1315                 error = sctp_peeraddr(so, nam);
 1316                 if (error) {
 1317                         return (error);
 1318                 }
 1319                 addr = *nam;
 1320                 /* if I'm V6ONLY, convert it to v4-mapped */
 1321                 if (SCTP_IPV6_V6ONLY(inp6)) {
 1322                         struct sockaddr_in6 sin6;
 1323 
 1324                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
 1325                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
 1326                 }
 1327         }
 1328 #endif
 1329         return (error);
 1330 }
 1331 
 1332 struct pr_usrreqs sctp6_usrreqs = {
 1333         .pru_abort = sctp6_abort,
 1334         .pru_accept = sctp_accept,
 1335         .pru_attach = sctp6_attach,
 1336         .pru_bind = sctp6_bind,
 1337         .pru_connect = sctp6_connect,
 1338         .pru_control = in6_control,
 1339         .pru_close = sctp6_close,
 1340         .pru_detach = sctp6_close,
 1341         .pru_sopoll = sopoll_generic,
 1342         .pru_flush = sctp_flush,
 1343         .pru_disconnect = sctp6_disconnect,
 1344         .pru_listen = sctp_listen,
 1345         .pru_peeraddr = sctp6_getpeeraddr,
 1346         .pru_send = sctp6_send,
 1347         .pru_shutdown = sctp_shutdown,
 1348         .pru_sockaddr = sctp6_in6getaddr,
 1349         .pru_sosend = sctp_sosend,
 1350         .pru_soreceive = sctp_soreceive
 1351 };

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