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

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