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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions are met:
   10  *
   11  * a) Redistributions of source code must retain the above copyright notice,
   12  *    this list of conditions and the following disclaimer.
   13  *
   14  * b) Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in
   16  *    the documentation and/or other materials provided with the distribution.
   17  *
   18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   19  *    contributors may be used to endorse or promote products derived
   20  *    from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   32  * THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include <netinet/sctp_os.h>
   39 #ifdef INET6
   40 #include <sys/proc.h>
   41 #include <netinet/sctp_pcb.h>
   42 #include <netinet/sctp_header.h>
   43 #include <netinet/sctp_var.h>
   44 #include <netinet6/sctp6_var.h>
   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/icmp6.h>
   58 #include <netinet/udp.h>
   59 
   60 int
   61 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
   62 {
   63         struct mbuf *m;
   64         int iphlen;
   65         uint32_t vrf_id;
   66         uint8_t ecn_bits;
   67         struct sockaddr_in6 src, dst;
   68         struct ip6_hdr *ip6;
   69         struct sctphdr *sh;
   70         struct sctp_chunkhdr *ch;
   71         int length, offset;
   72         uint8_t compute_crc;
   73         uint32_t mflowid;
   74         uint8_t mflowtype;
   75         uint16_t fibnum;
   76 
   77         iphlen = *offp;
   78         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
   79                 SCTP_RELEASE_PKT(*i_pak);
   80                 return (IPPROTO_DONE);
   81         }
   82         m = SCTP_HEADER_TO_CHAIN(*i_pak);
   83 #ifdef SCTP_MBUF_LOGGING
   84         /* Log in any input mbufs */
   85         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
   86                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
   87         }
   88 #endif
   89 #ifdef SCTP_PACKET_LOGGING
   90         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
   91                 sctp_packet_log(m);
   92         }
   93 #endif
   94         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
   95             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
   96             m->m_pkthdr.len,
   97             if_name(m->m_pkthdr.rcvif),
   98             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
   99         mflowid = m->m_pkthdr.flowid;
  100         mflowtype = M_HASHTYPE_GET(m);
  101         fibnum = M_GETFIB(m);
  102         SCTP_STAT_INCR(sctps_recvpackets);
  103         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
  104         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
  105         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
  106         if (m->m_len < offset) {
  107                 m = m_pullup(m, offset);
  108                 if (m == NULL) {
  109                         SCTP_STAT_INCR(sctps_hdrops);
  110                         return (IPPROTO_DONE);
  111                 }
  112         }
  113         ip6 = mtod(m, struct ip6_hdr *);
  114         sh = (struct sctphdr *)(mtod(m, caddr_t)+iphlen);
  115         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
  116         offset -= sizeof(struct sctp_chunkhdr);
  117         memset(&src, 0, sizeof(struct sockaddr_in6));
  118         src.sin6_family = AF_INET6;
  119         src.sin6_len = sizeof(struct sockaddr_in6);
  120         src.sin6_port = sh->src_port;
  121         src.sin6_addr = ip6->ip6_src;
  122         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  123                 goto out;
  124         }
  125         memset(&dst, 0, sizeof(struct sockaddr_in6));
  126         dst.sin6_family = AF_INET6;
  127         dst.sin6_len = sizeof(struct sockaddr_in6);
  128         dst.sin6_port = sh->dest_port;
  129         dst.sin6_addr = ip6->ip6_dst;
  130         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  131                 goto out;
  132         }
  133         length = ntohs(ip6->ip6_plen) + iphlen;
  134         /* Validate mbuf chain length with IP payload length. */
  135         if (SCTP_HEADER_LEN(m) != length) {
  136                 SCTPDBG(SCTP_DEBUG_INPUT1,
  137                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
  138                 SCTP_STAT_INCR(sctps_hdrops);
  139                 goto out;
  140         }
  141         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  142                 goto out;
  143         }
  144         ecn_bits = IPV6_TRAFFIC_CLASS(ip6);
  145         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
  146                 SCTP_STAT_INCR(sctps_recvhwcrc);
  147                 compute_crc = 0;
  148         } else {
  149                 SCTP_STAT_INCR(sctps_recvswcrc);
  150                 compute_crc = 1;
  151         }
  152         sctp_common_input_processing(&m, iphlen, offset, length,
  153             (struct sockaddr *)&src,
  154             (struct sockaddr *)&dst,
  155             sh, ch,
  156             compute_crc,
  157             ecn_bits,
  158             mflowtype, mflowid, fibnum,
  159             vrf_id, port);
  160 out:
  161         if (m) {
  162                 sctp_m_freem(m);
  163         }
  164         return (IPPROTO_DONE);
  165 }
  166 
  167 int
  168 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
  169 {
  170         return (sctp6_input_with_port(i_pak, offp, 0));
  171 }
  172 
  173 void
  174 sctp6_notify(struct sctp_inpcb *inp,
  175     struct sctp_tcb *stcb,
  176     struct sctp_nets *net,
  177     uint8_t icmp6_type,
  178     uint8_t icmp6_code,
  179     uint32_t next_mtu)
  180 {
  181         int timer_stopped;
  182 
  183         switch (icmp6_type) {
  184         case ICMP6_DST_UNREACH:
  185                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
  186                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
  187                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
  188                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
  189                         /* Mark the net unreachable. */
  190                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
  191                                 /* Ok that destination is not reachable */
  192                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
  193                                 net->dest_state &= ~SCTP_ADDR_PF;
  194                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  195                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
  196                         }
  197                 }
  198                 SCTP_TCB_UNLOCK(stcb);
  199                 break;
  200         case ICMP6_PARAM_PROB:
  201                 /* Treat it like an ABORT. */
  202                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
  203                         sctp_abort_notification(stcb, true, false, 0, NULL, SCTP_SO_NOT_LOCKED);
  204                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
  205                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
  206                 } else {
  207                         SCTP_TCB_UNLOCK(stcb);
  208                 }
  209                 break;
  210         case ICMP6_PACKET_TOO_BIG:
  211                 if (net->dest_state & SCTP_ADDR_NO_PMTUD) {
  212                         SCTP_TCB_UNLOCK(stcb);
  213                         break;
  214                 }
  215                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
  216                         timer_stopped = 1;
  217                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
  218                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
  219                 } else {
  220                         timer_stopped = 0;
  221                 }
  222                 /* Update the path MTU. */
  223                 if (net->port) {
  224                         next_mtu -= sizeof(struct udphdr);
  225                 }
  226                 if (net->mtu > next_mtu) {
  227                         net->mtu = next_mtu;
  228                         if (net->port) {
  229                                 sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu + sizeof(struct udphdr));
  230                         } else {
  231                                 sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu);
  232                         }
  233                 }
  234                 /* Update the association MTU */
  235                 if (stcb->asoc.smallest_mtu > next_mtu) {
  236                         sctp_pathmtu_adjustment(stcb, next_mtu, true);
  237                 }
  238                 /* Finally, start the PMTU timer if it was running before. */
  239                 if (timer_stopped) {
  240                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
  241                 }
  242                 SCTP_TCB_UNLOCK(stcb);
  243                 break;
  244         default:
  245                 SCTP_TCB_UNLOCK(stcb);
  246                 break;
  247         }
  248 }
  249 
  250 void
  251 sctp6_ctlinput(struct ip6ctlparam *ip6cp)
  252 {
  253         struct sctp_inpcb *inp;
  254         struct sctp_tcb *stcb;
  255         struct sctp_nets *net;
  256         struct sctphdr sh;
  257         struct sockaddr_in6 src, dst;
  258 
  259         if (icmp6_errmap(ip6cp->ip6c_icmp6) == 0) {
  260                 return;
  261         }
  262 
  263         /*
  264          * Check if we can safely examine the ports and the verification tag
  265          * of the SCTP common header.
  266          */
  267         if (ip6cp->ip6c_m->m_pkthdr.len <
  268             (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
  269                 return;
  270         }
  271 
  272         /* Copy out the port numbers and the verification tag. */
  273         memset(&sh, 0, sizeof(sh));
  274         m_copydata(ip6cp->ip6c_m,
  275             ip6cp->ip6c_off,
  276             sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
  277             (caddr_t)&sh);
  278         memset(&src, 0, sizeof(struct sockaddr_in6));
  279         src.sin6_family = AF_INET6;
  280         src.sin6_len = sizeof(struct sockaddr_in6);
  281         src.sin6_port = sh.src_port;
  282         src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
  283         if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
  284                 return;
  285         }
  286         memset(&dst, 0, sizeof(struct sockaddr_in6));
  287         dst.sin6_family = AF_INET6;
  288         dst.sin6_len = sizeof(struct sockaddr_in6);
  289         dst.sin6_port = sh.dest_port;
  290         dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
  291         if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
  292                 return;
  293         }
  294         inp = NULL;
  295         net = NULL;
  296         stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
  297             (struct sockaddr *)&src,
  298             &inp, &net, 1, SCTP_DEFAULT_VRFID);
  299         if ((stcb != NULL) &&
  300             (net != NULL) &&
  301             (inp != NULL)) {
  302                 /* Check the verification tag */
  303                 if (ntohl(sh.v_tag) != 0) {
  304                         /*
  305                          * This must be the verification tag used for
  306                          * sending out packets. We don't consider packets
  307                          * reflecting the verification tag.
  308                          */
  309                         if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
  310                                 SCTP_TCB_UNLOCK(stcb);
  311                                 return;
  312                         }
  313                 } else {
  314                         if (ip6cp->ip6c_m->m_pkthdr.len >=
  315                             ip6cp->ip6c_off + sizeof(struct sctphdr) +
  316                             sizeof(struct sctp_chunkhdr) +
  317                             offsetof(struct sctp_init, a_rwnd)) {
  318                                 /*
  319                                  * In this case we can check if we got an
  320                                  * INIT chunk and if the initiate tag
  321                                  * matches.
  322                                  */
  323                                 uint32_t initiate_tag;
  324                                 uint8_t chunk_type;
  325 
  326                                 m_copydata(ip6cp->ip6c_m,
  327                                     ip6cp->ip6c_off +
  328                                     sizeof(struct sctphdr),
  329                                     sizeof(uint8_t),
  330                                     (caddr_t)&chunk_type);
  331                                 m_copydata(ip6cp->ip6c_m,
  332                                     ip6cp->ip6c_off +
  333                                     sizeof(struct sctphdr) +
  334                                     sizeof(struct sctp_chunkhdr),
  335                                     sizeof(uint32_t),
  336                                     (caddr_t)&initiate_tag);
  337                                 if ((chunk_type != SCTP_INITIATION) ||
  338                                     (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
  339                                         SCTP_TCB_UNLOCK(stcb);
  340                                         return;
  341                                 }
  342                         } else {
  343                                 SCTP_TCB_UNLOCK(stcb);
  344                                 return;
  345                         }
  346                 }
  347                 sctp6_notify(inp, stcb, net,
  348                     ip6cp->ip6c_icmp6->icmp6_type,
  349                     ip6cp->ip6c_icmp6->icmp6_code,
  350                     ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
  351         } else {
  352                 if ((stcb == NULL) && (inp != NULL)) {
  353                         /* reduce inp's ref-count */
  354                         SCTP_INP_WLOCK(inp);
  355                         SCTP_INP_DECR_REF(inp);
  356                         SCTP_INP_WUNLOCK(inp);
  357                 }
  358                 if (stcb) {
  359                         SCTP_TCB_UNLOCK(stcb);
  360                 }
  361         }
  362 }
  363 
  364 /*
  365  * this routine can probably be collasped into the one in sctp_userreq.c
  366  * since they do the same thing and now we lookup with a sockaddr
  367  */
  368 static int
  369 sctp6_getcred(SYSCTL_HANDLER_ARGS)
  370 {
  371         struct xucred xuc;
  372         struct sockaddr_in6 addrs[2];
  373         struct sctp_inpcb *inp;
  374         struct sctp_nets *net;
  375         struct sctp_tcb *stcb;
  376         int error;
  377         uint32_t vrf_id;
  378 
  379         vrf_id = SCTP_DEFAULT_VRFID;
  380 
  381         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  382         if (error)
  383                 return (error);
  384 
  385         if (req->newlen != sizeof(addrs)) {
  386                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  387                 return (EINVAL);
  388         }
  389         if (req->oldlen != sizeof(struct ucred)) {
  390                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  391                 return (EINVAL);
  392         }
  393         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  394         if (error)
  395                 return (error);
  396 
  397         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
  398             sin6tosa(&addrs[0]),
  399             &inp, &net, 1, vrf_id);
  400         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
  401                 if ((inp != NULL) && (stcb == NULL)) {
  402                         /* reduce ref-count */
  403                         SCTP_INP_WLOCK(inp);
  404                         SCTP_INP_DECR_REF(inp);
  405                         goto cred_can_cont;
  406                 }
  407                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  408                 error = ENOENT;
  409                 goto out;
  410         }
  411         SCTP_TCB_UNLOCK(stcb);
  412         /*
  413          * We use the write lock here, only since in the error leg we need
  414          * it. If we used RLOCK, then we would have to
  415          * wlock/decr/unlock/rlock. Which in theory could create a hole.
  416          * Better to use higher wlock.
  417          */
  418         SCTP_INP_WLOCK(inp);
  419 cred_can_cont:
  420         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
  421         if (error) {
  422                 SCTP_INP_WUNLOCK(inp);
  423                 goto out;
  424         }
  425         cru2x(inp->sctp_socket->so_cred, &xuc);
  426         SCTP_INP_WUNLOCK(inp);
  427         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  428 out:
  429         return (error);
  430 }
  431 
  432 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred,
  433     CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
  434     0, 0, sctp6_getcred, "S,ucred",
  435     "Get the ucred of a SCTP6 connection");
  436 
  437 /* This is the same as the sctp_abort() could be made common */
  438 static void
  439 sctp6_abort(struct socket *so)
  440 {
  441         struct epoch_tracker et;
  442         struct sctp_inpcb *inp;
  443         uint32_t flags;
  444 
  445         inp = (struct sctp_inpcb *)so->so_pcb;
  446         if (inp == NULL) {
  447                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  448                 return;
  449         }
  450         NET_EPOCH_ENTER(et);
  451 sctp_must_try_again:
  452         flags = inp->sctp_flags;
  453 #ifdef SCTP_LOG_CLOSING
  454         sctp_log_closing(inp, NULL, 17);
  455 #endif
  456         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
  457             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
  458 #ifdef SCTP_LOG_CLOSING
  459                 sctp_log_closing(inp, NULL, 16);
  460 #endif
  461                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
  462                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
  463                 SOCK_LOCK(so);
  464                 SCTP_SB_CLEAR(so->so_snd);
  465                 /*
  466                  * same for the rcv ones, they are only here for the
  467                  * accounting/select.
  468                  */
  469                 SCTP_SB_CLEAR(so->so_rcv);
  470                 /* Now null out the reference, we are completely detached. */
  471                 so->so_pcb = NULL;
  472                 SOCK_UNLOCK(so);
  473         } else {
  474                 flags = inp->sctp_flags;
  475                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
  476                         goto sctp_must_try_again;
  477                 }
  478         }
  479         NET_EPOCH_EXIT(et);
  480         return;
  481 }
  482 
  483 static int
  484 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
  485 {
  486         int error;
  487         struct sctp_inpcb *inp;
  488         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
  489 
  490         inp = (struct sctp_inpcb *)so->so_pcb;
  491         if (inp != NULL) {
  492                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  493                 return (EINVAL);
  494         }
  495 
  496         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  497                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
  498                 if (error)
  499                         return (error);
  500         }
  501         error = sctp_inpcb_alloc(so, vrf_id);
  502         if (error)
  503                 return (error);
  504         inp = (struct sctp_inpcb *)so->so_pcb;
  505         SCTP_INP_WLOCK(inp);
  506         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
  507 
  508         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
  509         inp->ip_inp.inp.in6p_hops = -1; /* use kernel default */
  510         inp->ip_inp.inp.in6p_cksum = -1;        /* just to be sure */
  511 #ifdef INET
  512         /*
  513          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
  514          * socket as well, because the socket may be bound to an IPv6
  515          * wildcard address, which may match an IPv4-mapped IPv6 address.
  516          */
  517         inp->ip_inp.inp.inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
  518 #endif
  519         SCTP_INP_WUNLOCK(inp);
  520         return (0);
  521 }
  522 
  523 static int
  524 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
  525 {
  526         struct sctp_inpcb *inp;
  527         int error;
  528         u_char vflagsav;
  529 
  530         inp = (struct sctp_inpcb *)so->so_pcb;
  531         if (inp == NULL) {
  532                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  533                 return (EINVAL);
  534         }
  535 
  536         if (addr) {
  537                 switch (addr->sa_family) {
  538 #ifdef INET
  539                 case AF_INET:
  540                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
  541                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  542                                 return (EINVAL);
  543                         }
  544                         break;
  545 #endif
  546 #ifdef INET6
  547                 case AF_INET6:
  548                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  549                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  550                                 return (EINVAL);
  551                         }
  552                         break;
  553 #endif
  554                 default:
  555                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  556                         return (EINVAL);
  557                 }
  558         }
  559         vflagsav = inp->ip_inp.inp.inp_vflag;
  560         inp->ip_inp.inp.inp_vflag &= ~INP_IPV4;
  561         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
  562         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp) == 0)) {
  563                 switch (addr->sa_family) {
  564 #ifdef INET
  565                 case AF_INET:
  566                         /* binding v4 addr to v6 socket, so reset flags */
  567                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
  568                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
  569                         break;
  570 #endif
  571 #ifdef INET6
  572                 case AF_INET6:
  573                         {
  574                                 struct sockaddr_in6 *sin6_p;
  575 
  576                                 sin6_p = (struct sockaddr_in6 *)addr;
  577 
  578                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
  579                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
  580                                 }
  581 #ifdef INET
  582                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  583                                         struct sockaddr_in sin;
  584 
  585                                         in6_sin6_2_sin(&sin, sin6_p);
  586                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
  587                                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
  588                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
  589                                         goto out;
  590                                 }
  591 #endif
  592                                 break;
  593                         }
  594 #endif
  595                 default:
  596                         break;
  597                 }
  598         } else if (addr != NULL) {
  599                 struct sockaddr_in6 *sin6_p;
  600 
  601                 /* IPV6_V6ONLY socket */
  602 #ifdef INET
  603                 if (addr->sa_family == AF_INET) {
  604                         /* can't bind v4 addr to v6 only socket! */
  605                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  606                         error = EINVAL;
  607                         goto out;
  608                 }
  609 #endif
  610                 sin6_p = (struct sockaddr_in6 *)addr;
  611 
  612                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  613                         /* can't bind v4-mapped addrs either! */
  614                         /* NOTE: we don't support SIIT */
  615                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  616                         error = EINVAL;
  617                         goto out;
  618                 }
  619         }
  620         error = sctp_inpcb_bind(so, addr, NULL, p);
  621 out:
  622         if (error != 0)
  623                 inp->ip_inp.inp.inp_vflag = vflagsav;
  624         return (error);
  625 }
  626 
  627 static void
  628 sctp6_close(struct socket *so)
  629 {
  630         sctp_close(so);
  631 }
  632 
  633 /* This could be made common with sctp_detach() since they are identical */
  634 
  635 static
  636 int
  637 sctp6_disconnect(struct socket *so)
  638 {
  639         return (sctp_disconnect(so));
  640 }
  641 
  642 int
  643 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  644     struct mbuf *control, struct thread *p);
  645 
  646 static int
  647 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  648     struct mbuf *control, struct thread *p)
  649 {
  650         struct sctp_inpcb *inp;
  651 
  652 #ifdef INET
  653         struct sockaddr_in6 *sin6;
  654 #endif                          /* INET */
  655         /* No SPL needed since sctp_output does this */
  656 
  657         inp = (struct sctp_inpcb *)so->so_pcb;
  658         if (inp == NULL) {
  659                 if (control) {
  660                         SCTP_RELEASE_PKT(control);
  661                         control = NULL;
  662                 }
  663                 SCTP_RELEASE_PKT(m);
  664                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  665                 return (EINVAL);
  666         }
  667         /*
  668          * For the TCP model we may get a NULL addr, if we are a connected
  669          * socket thats ok.
  670          */
  671         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
  672             (addr == NULL)) {
  673                 goto connected_type;
  674         }
  675         if (addr == NULL) {
  676                 SCTP_RELEASE_PKT(m);
  677                 if (control) {
  678                         SCTP_RELEASE_PKT(control);
  679                         control = NULL;
  680                 }
  681                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
  682                 return (EDESTADDRREQ);
  683         }
  684         switch (addr->sa_family) {
  685 #ifdef INET
  686         case AF_INET:
  687                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
  688                         if (control) {
  689                                 SCTP_RELEASE_PKT(control);
  690                                 control = NULL;
  691                         }
  692                         SCTP_RELEASE_PKT(m);
  693                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  694                         return (EINVAL);
  695                 }
  696                 break;
  697 #endif
  698 #ifdef INET6
  699         case AF_INET6:
  700                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  701                         if (control) {
  702                                 SCTP_RELEASE_PKT(control);
  703                                 control = NULL;
  704                         }
  705                         SCTP_RELEASE_PKT(m);
  706                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  707                         return (EINVAL);
  708                 }
  709                 break;
  710 #endif
  711         default:
  712                 if (control) {
  713                         SCTP_RELEASE_PKT(control);
  714                         control = NULL;
  715                 }
  716                 SCTP_RELEASE_PKT(m);
  717                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  718                 return (EINVAL);
  719         }
  720 #ifdef INET
  721         sin6 = (struct sockaddr_in6 *)addr;
  722         if (SCTP_IPV6_V6ONLY(inp)) {
  723                 /*
  724                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
  725                  * v4 addr or v4-mapped addr
  726                  */
  727                 if (addr->sa_family == AF_INET) {
  728                         if (control) {
  729                                 SCTP_RELEASE_PKT(control);
  730                                 control = NULL;
  731                         }
  732                         SCTP_RELEASE_PKT(m);
  733                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  734                         return (EINVAL);
  735                 }
  736                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  737                         if (control) {
  738                                 SCTP_RELEASE_PKT(control);
  739                                 control = NULL;
  740                         }
  741                         SCTP_RELEASE_PKT(m);
  742                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  743                         return (EINVAL);
  744                 }
  745         }
  746         if ((addr->sa_family == AF_INET6) &&
  747             IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  748                 struct sockaddr_in sin;
  749 
  750                 /* convert v4-mapped into v4 addr and send */
  751                 in6_sin6_2_sin(&sin, sin6);
  752                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
  753         }
  754 #endif                          /* INET */
  755 connected_type:
  756         /* now what about control */
  757         if (control) {
  758                 if (inp->control) {
  759                         SCTP_PRINTF("huh? control set?\n");
  760                         SCTP_RELEASE_PKT(inp->control);
  761                         inp->control = NULL;
  762                 }
  763                 inp->control = control;
  764         }
  765         /* Place the data */
  766         if (inp->pkt) {
  767                 SCTP_BUF_NEXT(inp->pkt_last) = m;
  768                 inp->pkt_last = m;
  769         } else {
  770                 inp->pkt_last = inp->pkt = m;
  771         }
  772         if (
  773         /* FreeBSD and MacOSX uses a flag passed */
  774             ((flags & PRUS_MORETOCOME) == 0)
  775             ) {
  776                 /*
  777                  * note with the current version this code will only be used
  778                  * by OpenBSD, NetBSD and FreeBSD have methods for
  779                  * re-defining sosend() to use sctp_sosend().  One can
  780                  * optionaly switch back to this code (by changing back the
  781                  * defininitions but this is not advisable.
  782                  */
  783                 struct epoch_tracker et;
  784                 int ret;
  785 
  786                 NET_EPOCH_ENTER(et);
  787                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
  788                 NET_EPOCH_EXIT(et);
  789                 inp->pkt = NULL;
  790                 inp->control = NULL;
  791                 return (ret);
  792         } else {
  793                 return (0);
  794         }
  795 }
  796 
  797 static int
  798 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
  799 {
  800         struct epoch_tracker et;
  801         uint32_t vrf_id;
  802         int error = 0;
  803         struct sctp_inpcb *inp;
  804         struct sctp_tcb *stcb;
  805 #ifdef INET
  806         struct sockaddr_in6 *sin6;
  807         union sctp_sockstore store;
  808 #endif
  809 
  810         inp = (struct sctp_inpcb *)so->so_pcb;
  811         if (inp == NULL) {
  812                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  813                 return (ECONNRESET);    /* I made the same as TCP since we are
  814                                          * not setup? */
  815         }
  816         if (addr == NULL) {
  817                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  818                 return (EINVAL);
  819         }
  820         switch (addr->sa_family) {
  821 #ifdef INET
  822         case AF_INET:
  823                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
  824                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  825                         return (EINVAL);
  826                 }
  827                 break;
  828 #endif
  829 #ifdef INET6
  830         case AF_INET6:
  831                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  832                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  833                         return (EINVAL);
  834                 }
  835                 break;
  836 #endif
  837         default:
  838                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  839                 return (EINVAL);
  840         }
  841 
  842         vrf_id = inp->def_vrf_id;
  843         SCTP_ASOC_CREATE_LOCK(inp);
  844         SCTP_INP_RLOCK(inp);
  845         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
  846             SCTP_PCB_FLAGS_UNBOUND) {
  847                 /* Bind a ephemeral port */
  848                 SCTP_INP_RUNLOCK(inp);
  849                 error = sctp6_bind(so, NULL, p);
  850                 if (error) {
  851                         SCTP_ASOC_CREATE_UNLOCK(inp);
  852 
  853                         return (error);
  854                 }
  855                 SCTP_INP_RLOCK(inp);
  856         }
  857         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
  858             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
  859                 /* We are already connected AND the TCP model */
  860                 SCTP_INP_RUNLOCK(inp);
  861                 SCTP_ASOC_CREATE_UNLOCK(inp);
  862                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
  863                 return (EADDRINUSE);
  864         }
  865 #ifdef INET
  866         sin6 = (struct sockaddr_in6 *)addr;
  867         if (SCTP_IPV6_V6ONLY(inp)) {
  868                 /*
  869                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
  870                  * addr or v4-mapped addr
  871                  */
  872                 if (addr->sa_family == AF_INET) {
  873                         SCTP_INP_RUNLOCK(inp);
  874                         SCTP_ASOC_CREATE_UNLOCK(inp);
  875                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  876                         return (EINVAL);
  877                 }
  878                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  879                         SCTP_INP_RUNLOCK(inp);
  880                         SCTP_ASOC_CREATE_UNLOCK(inp);
  881                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  882                         return (EINVAL);
  883                 }
  884         }
  885         if ((addr->sa_family == AF_INET6) &&
  886             IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  887                 /* convert v4-mapped into v4 addr */
  888                 in6_sin6_2_sin(&store.sin, sin6);
  889                 addr = &store.sa;
  890         }
  891 #endif                          /* INET */
  892         /* Now do we connect? */
  893         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
  894                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
  895                 if (stcb) {
  896                         SCTP_TCB_LOCK(stcb);
  897                 }
  898                 SCTP_INP_RUNLOCK(inp);
  899         } else {
  900                 SCTP_INP_RUNLOCK(inp);
  901                 SCTP_INP_WLOCK(inp);
  902                 SCTP_INP_INCR_REF(inp);
  903                 SCTP_INP_WUNLOCK(inp);
  904                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
  905                 if (stcb == NULL) {
  906                         SCTP_INP_WLOCK(inp);
  907                         SCTP_INP_DECR_REF(inp);
  908                         SCTP_INP_WUNLOCK(inp);
  909                 }
  910         }
  911 
  912         if (stcb != NULL) {
  913                 /* Already have or am bring up an association */
  914                 SCTP_ASOC_CREATE_UNLOCK(inp);
  915                 SCTP_TCB_UNLOCK(stcb);
  916                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
  917                 return (EALREADY);
  918         }
  919         /* We are GOOD to go */
  920         stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
  921             inp->sctp_ep.pre_open_stream_count,
  922             inp->sctp_ep.port, p,
  923             SCTP_INITIALIZE_AUTH_PARAMS);
  924         SCTP_ASOC_CREATE_UNLOCK(inp);
  925         if (stcb == NULL) {
  926                 /* Gak! no memory */
  927                 return (error);
  928         }
  929         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
  930         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
  931         NET_EPOCH_ENTER(et);
  932         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
  933         SCTP_TCB_UNLOCK(stcb);
  934         NET_EPOCH_EXIT(et);
  935         return (error);
  936 }
  937 
  938 static int
  939 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
  940 {
  941         struct sockaddr_in6 *sin6;
  942         struct sctp_inpcb *inp;
  943         uint32_t vrf_id;
  944         struct sctp_ifa *sctp_ifa;
  945 
  946         int error;
  947 
  948         /*
  949          * Do the malloc first in case it blocks.
  950          */
  951         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
  952         if (sin6 == NULL)
  953                 return (ENOMEM);
  954         sin6->sin6_family = AF_INET6;
  955         sin6->sin6_len = sizeof(*sin6);
  956 
  957         inp = (struct sctp_inpcb *)so->so_pcb;
  958         if (inp == NULL) {
  959                 SCTP_FREE_SONAME(sin6);
  960                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  961                 return (ECONNRESET);
  962         }
  963         SCTP_INP_RLOCK(inp);
  964         sin6->sin6_port = inp->sctp_lport;
  965         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
  966                 /* For the bound all case you get back 0 */
  967                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
  968                         struct sctp_tcb *stcb;
  969                         struct sockaddr_in6 *sin_a6;
  970                         struct sctp_nets *net;
  971                         int fnd;
  972 
  973                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
  974                         if (stcb == NULL) {
  975                                 SCTP_INP_RUNLOCK(inp);
  976                                 SCTP_FREE_SONAME(sin6);
  977                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  978                                 return (ENOENT);
  979                         }
  980                         fnd = 0;
  981                         sin_a6 = NULL;
  982                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  983                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
  984                                 if (sin_a6 == NULL)
  985                                         /* this will make coverity happy */
  986                                         continue;
  987 
  988                                 if (sin_a6->sin6_family == AF_INET6) {
  989                                         fnd = 1;
  990                                         break;
  991                                 }
  992                         }
  993                         if ((!fnd) || (sin_a6 == NULL)) {
  994                                 /* punt */
  995                                 SCTP_INP_RUNLOCK(inp);
  996                                 SCTP_FREE_SONAME(sin6);
  997                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  998                                 return (ENOENT);
  999                         }
 1000                         vrf_id = inp->def_vrf_id;
 1001                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
 1002                         if (sctp_ifa) {
 1003                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
 1004                         }
 1005                 } else {
 1006                         /* For the bound all case you get back 0 */
 1007                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
 1008                 }
 1009         } else {
 1010                 /* Take the first IPv6 address in the list */
 1011                 struct sctp_laddr *laddr;
 1012                 int fnd = 0;
 1013 
 1014                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 1015                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
 1016                                 struct sockaddr_in6 *sin_a;
 1017 
 1018                                 sin_a = &laddr->ifa->address.sin6;
 1019                                 sin6->sin6_addr = sin_a->sin6_addr;
 1020                                 fnd = 1;
 1021                                 break;
 1022                         }
 1023                 }
 1024                 if (!fnd) {
 1025                         SCTP_FREE_SONAME(sin6);
 1026                         SCTP_INP_RUNLOCK(inp);
 1027                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1028                         return (ENOENT);
 1029                 }
 1030         }
 1031         SCTP_INP_RUNLOCK(inp);
 1032         /* Scoping things for v6 */
 1033         if ((error = sa6_recoverscope(sin6)) != 0) {
 1034                 SCTP_FREE_SONAME(sin6);
 1035                 return (error);
 1036         }
 1037         (*addr) = (struct sockaddr *)sin6;
 1038         return (0);
 1039 }
 1040 
 1041 static int
 1042 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
 1043 {
 1044         struct sockaddr_in6 *sin6;
 1045         int fnd;
 1046         struct sockaddr_in6 *sin_a6;
 1047         struct sctp_inpcb *inp;
 1048         struct sctp_tcb *stcb;
 1049         struct sctp_nets *net;
 1050         int error;
 1051 
 1052         /* Do the malloc first in case it blocks. */
 1053         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1054         if (sin6 == NULL)
 1055                 return (ENOMEM);
 1056         sin6->sin6_family = AF_INET6;
 1057         sin6->sin6_len = sizeof(*sin6);
 1058 
 1059         inp = (struct sctp_inpcb *)so->so_pcb;
 1060         if ((inp == NULL) ||
 1061             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 1062                 /* UDP type and listeners will drop out here */
 1063                 SCTP_FREE_SONAME(sin6);
 1064                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
 1065                 return (ENOTCONN);
 1066         }
 1067         SCTP_INP_RLOCK(inp);
 1068         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1069         if (stcb) {
 1070                 SCTP_TCB_LOCK(stcb);
 1071         }
 1072         SCTP_INP_RUNLOCK(inp);
 1073         if (stcb == NULL) {
 1074                 SCTP_FREE_SONAME(sin6);
 1075                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 1076                 return (ECONNRESET);
 1077         }
 1078         fnd = 0;
 1079         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 1080                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1081                 if (sin_a6->sin6_family == AF_INET6) {
 1082                         fnd = 1;
 1083                         sin6->sin6_port = stcb->rport;
 1084                         sin6->sin6_addr = sin_a6->sin6_addr;
 1085                         break;
 1086                 }
 1087         }
 1088         SCTP_TCB_UNLOCK(stcb);
 1089         if (!fnd) {
 1090                 /* No IPv4 address */
 1091                 SCTP_FREE_SONAME(sin6);
 1092                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1093                 return (ENOENT);
 1094         }
 1095         if ((error = sa6_recoverscope(sin6)) != 0) {
 1096                 SCTP_FREE_SONAME(sin6);
 1097                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
 1098                 return (error);
 1099         }
 1100         *addr = (struct sockaddr *)sin6;
 1101         return (0);
 1102 }
 1103 
 1104 static int
 1105 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
 1106 {
 1107         struct inpcb *inp = sotoinpcb(so);
 1108         int error;
 1109 
 1110         if (inp == NULL) {
 1111                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1112                 return (EINVAL);
 1113         }
 1114 
 1115         /* allow v6 addresses precedence */
 1116         error = sctp6_getaddr(so, nam);
 1117 #ifdef INET
 1118         if (error) {
 1119                 struct sockaddr_in6 *sin6;
 1120 
 1121                 /* try v4 next if v6 failed */
 1122                 error = sctp_ingetaddr(so, nam);
 1123                 if (error) {
 1124                         return (error);
 1125                 }
 1126                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1127                 if (sin6 == NULL) {
 1128                         SCTP_FREE_SONAME(*nam);
 1129                         return (ENOMEM);
 1130                 }
 1131                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
 1132                 SCTP_FREE_SONAME(*nam);
 1133                 *nam = (struct sockaddr *)sin6;
 1134         }
 1135 #endif
 1136         return (error);
 1137 }
 1138 
 1139 static int
 1140 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
 1141 {
 1142         struct inpcb *inp = sotoinpcb(so);
 1143         int error;
 1144 
 1145         if (inp == NULL) {
 1146                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1147                 return (EINVAL);
 1148         }
 1149 
 1150         /* allow v6 addresses precedence */
 1151         error = sctp6_peeraddr(so, nam);
 1152 #ifdef INET
 1153         if (error) {
 1154                 struct sockaddr_in6 *sin6;
 1155 
 1156                 /* try v4 next if v6 failed */
 1157                 error = sctp_peeraddr(so, nam);
 1158                 if (error) {
 1159                         return (error);
 1160                 }
 1161                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1162                 if (sin6 == NULL) {
 1163                         SCTP_FREE_SONAME(*nam);
 1164                         return (ENOMEM);
 1165                 }
 1166                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
 1167                 SCTP_FREE_SONAME(*nam);
 1168                 *nam = (struct sockaddr *)sin6;
 1169         }
 1170 #endif
 1171         return (error);
 1172 }
 1173 
 1174 #define SCTP6_PROTOSW                                                   \
 1175         .pr_protocol =  IPPROTO_SCTP,                                   \
 1176         .pr_ctloutput = sctp_ctloutput,                                 \
 1177         .pr_abort =     sctp6_abort,                                    \
 1178         .pr_accept =    sctp_accept,                                    \
 1179         .pr_attach =    sctp6_attach,                                   \
 1180         .pr_bind =      sctp6_bind,                                     \
 1181         .pr_connect =   sctp6_connect,                                  \
 1182         .pr_control =   in6_control,                                    \
 1183         .pr_close =     sctp6_close,                                    \
 1184         .pr_detach =    sctp6_close,                                    \
 1185         .pr_sopoll =    sopoll_generic,                                 \
 1186         .pr_flush =     sctp_flush,                                     \
 1187         .pr_disconnect = sctp6_disconnect,                              \
 1188         .pr_listen =    sctp_listen,                                    \
 1189         .pr_peeraddr =  sctp6_getpeeraddr,                              \
 1190         .pr_send =      sctp6_send,                                     \
 1191         .pr_shutdown =  sctp_shutdown,                                  \
 1192         .pr_sockaddr =  sctp6_in6getaddr,                               \
 1193         .pr_sosend =    sctp_sosend,                                    \
 1194         .pr_soreceive = sctp_soreceive
 1195 
 1196 struct protosw sctp6_seqpacket_protosw = {
 1197         .pr_type = SOCK_SEQPACKET,
 1198         .pr_flags = PR_WANTRCVD,
 1199         SCTP6_PROTOSW
 1200 };
 1201 
 1202 struct protosw sctp6_stream_protosw = {
 1203         .pr_type = SOCK_STREAM,
 1204         .pr_flags = PR_CONNREQUIRED | PR_WANTRCVD,
 1205         SCTP6_PROTOSW
 1206 };
 1207 #endif

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