The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/sctp6_usrreq.c

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/11.2/sys/netinet6/sctp6_usrreq.c 338980 2018-09-27 18:34:42Z gordon $");
   35 
   36 #include <netinet/sctp_os.h>
   37 #ifdef INET6
   38 #include <sys/proc.h>
   39 #include <netinet/sctp_pcb.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctp_var.h>
   42 #include <netinet6/sctp6_var.h>
   43 #include <netinet/sctp_sysctl.h>
   44 #include <netinet/sctp_output.h>
   45 #include <netinet/sctp_uio.h>
   46 #include <netinet/sctp_asconf.h>
   47 #include <netinet/sctputil.h>
   48 #include <netinet/sctp_indata.h>
   49 #include <netinet/sctp_timer.h>
   50 #include <netinet/sctp_auth.h>
   51 #include <netinet/sctp_input.h>
   52 #include <netinet/sctp_output.h>
   53 #include <netinet/sctp_bsd_addr.h>
   54 #include <netinet/sctp_crc32.h>
   55 #include <netinet/icmp6.h>
   56 #include <netinet/udp.h>
   57 
   58 extern struct protosw inetsw[];
   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         ip6 = mtod(m, struct ip6_hdr *);
  107         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
  108             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
  109         if (sh == NULL) {
  110                 SCTP_STAT_INCR(sctps_hdrops);
  111                 return (IPPROTO_DONE);
  112         }
  113         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
  114         offset -= sizeof(struct sctp_chunkhdr);
  115         memset(&src, 0, sizeof(struct sockaddr_in6));
  116         src.sin6_family = AF_INET6;
  117         src.sin6_len = sizeof(struct sockaddr_in6);
  118         src.sin6_port = sh->src_port;
  119         src.sin6_addr = ip6->ip6_src;
  120         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  121                 goto out;
  122         }
  123         memset(&dst, 0, sizeof(struct sockaddr_in6));
  124         dst.sin6_family = AF_INET6;
  125         dst.sin6_len = sizeof(struct sockaddr_in6);
  126         dst.sin6_port = sh->dest_port;
  127         dst.sin6_addr = ip6->ip6_dst;
  128         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  129                 goto out;
  130         }
  131         length = ntohs(ip6->ip6_plen) + iphlen;
  132         /* Validate mbuf chain length with IP payload length. */
  133         if (SCTP_HEADER_LEN(m) != length) {
  134                 SCTPDBG(SCTP_DEBUG_INPUT1,
  135                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
  136                 SCTP_STAT_INCR(sctps_hdrops);
  137                 goto out;
  138         }
  139         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  140                 goto out;
  141         }
  142         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
  143         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
  144                 SCTP_STAT_INCR(sctps_recvhwcrc);
  145                 compute_crc = 0;
  146         } else {
  147                 SCTP_STAT_INCR(sctps_recvswcrc);
  148                 compute_crc = 1;
  149         }
  150         sctp_common_input_processing(&m, iphlen, offset, length,
  151             (struct sockaddr *)&src,
  152             (struct sockaddr *)&dst,
  153             sh, ch,
  154             compute_crc,
  155             ecn_bits,
  156             mflowtype, mflowid, fibnum,
  157             vrf_id, port);
  158 out:
  159         if (m) {
  160                 sctp_m_freem(m);
  161         }
  162         return (IPPROTO_DONE);
  163 }
  164 
  165 
  166 int
  167 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
  168 {
  169         return (sctp6_input_with_port(i_pak, offp, 0));
  170 }
  171 
  172 void
  173 sctp6_notify(struct sctp_inpcb *inp,
  174     struct sctp_tcb *stcb,
  175     struct sctp_nets *net,
  176     uint8_t icmp6_type,
  177     uint8_t icmp6_code,
  178     uint32_t next_mtu)
  179 {
  180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  181         struct socket *so;
  182 #endif
  183         int timer_stopped;
  184 
  185         switch (icmp6_type) {
  186         case ICMP6_DST_UNREACH:
  187                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
  188                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
  189                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
  190                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
  191                         /* Mark the net unreachable. */
  192                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
  193                                 /* Ok that destination is not reachable */
  194                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
  195                                 net->dest_state &= ~SCTP_ADDR_PF;
  196                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  197                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
  198                         }
  199                 }
  200                 SCTP_TCB_UNLOCK(stcb);
  201                 break;
  202         case ICMP6_PARAM_PROB:
  203                 /* Treat it like an ABORT. */
  204                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
  205                         sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
  206 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  207                         so = SCTP_INP_SO(inp);
  208                         atomic_add_int(&stcb->asoc.refcnt, 1);
  209                         SCTP_TCB_UNLOCK(stcb);
  210                         SCTP_SOCKET_LOCK(so, 1);
  211                         SCTP_TCB_LOCK(stcb);
  212                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  213 #endif
  214                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
  215                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
  216 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  217                         SCTP_SOCKET_UNLOCK(so, 1);
  218 #endif
  219                 } else {
  220                         SCTP_TCB_UNLOCK(stcb);
  221                 }
  222                 break;
  223         case ICMP6_PACKET_TOO_BIG:
  224                 if (net->dest_state & SCTP_ADDR_NO_PMTUD) {
  225                         SCTP_TCB_UNLOCK(stcb);
  226                         break;
  227                 }
  228                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
  229                         timer_stopped = 1;
  230                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
  231                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
  232                 } else {
  233                         timer_stopped = 0;
  234                 }
  235                 /* Update the path MTU. */
  236                 if (net->port) {
  237                         next_mtu -= sizeof(struct udphdr);
  238                 }
  239                 if (net->mtu > next_mtu) {
  240                         net->mtu = next_mtu;
  241                 }
  242                 /* Update the association MTU */
  243                 if (stcb->asoc.smallest_mtu > next_mtu) {
  244                         sctp_pathmtu_adjustment(stcb, next_mtu);
  245                 }
  246                 /* Finally, start the PMTU timer if it was running before. */
  247                 if (timer_stopped) {
  248                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
  249                 }
  250                 SCTP_TCB_UNLOCK(stcb);
  251                 break;
  252         default:
  253                 SCTP_TCB_UNLOCK(stcb);
  254                 break;
  255         }
  256 }
  257 
  258 void
  259 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
  260 {
  261         struct ip6ctlparam *ip6cp;
  262         struct sctp_inpcb *inp;
  263         struct sctp_tcb *stcb;
  264         struct sctp_nets *net;
  265         struct sctphdr sh;
  266         struct sockaddr_in6 src, dst;
  267 
  268         if (pktdst->sa_family != AF_INET6 ||
  269             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
  270                 return;
  271         }
  272         if ((unsigned)cmd >= PRC_NCMDS) {
  273                 return;
  274         }
  275         if (PRC_IS_REDIRECT(cmd)) {
  276                 d = NULL;
  277         } else if (inet6ctlerrmap[cmd] == 0) {
  278                 return;
  279         }
  280         /* If the parameter is from icmp6, decode it. */
  281         if (d != NULL) {
  282                 ip6cp = (struct ip6ctlparam *)d;
  283         } else {
  284                 ip6cp = (struct ip6ctlparam *)NULL;
  285         }
  286 
  287         if (ip6cp != NULL) {
  288                 /*
  289                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
  290                  * valid.
  291                  */
  292                 if (ip6cp->ip6c_m == NULL) {
  293                         return;
  294                 }
  295                 /*
  296                  * Check if we can safely examine the ports and the
  297                  * verification tag of the SCTP common header.
  298                  */
  299                 if (ip6cp->ip6c_m->m_pkthdr.len <
  300                     (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
  301                         return;
  302                 }
  303                 /* Copy out the port numbers and the verification tag. */
  304                 memset(&sh, 0, sizeof(sh));
  305                 m_copydata(ip6cp->ip6c_m,
  306                     ip6cp->ip6c_off,
  307                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
  308                     (caddr_t)&sh);
  309                 memset(&src, 0, sizeof(struct sockaddr_in6));
  310                 src.sin6_family = AF_INET6;
  311                 src.sin6_len = sizeof(struct sockaddr_in6);
  312                 src.sin6_port = sh.src_port;
  313                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
  314                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
  315                         return;
  316                 }
  317                 memset(&dst, 0, sizeof(struct sockaddr_in6));
  318                 dst.sin6_family = AF_INET6;
  319                 dst.sin6_len = sizeof(struct sockaddr_in6);
  320                 dst.sin6_port = sh.dest_port;
  321                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
  322                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
  323                         return;
  324                 }
  325                 inp = NULL;
  326                 net = NULL;
  327                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
  328                     (struct sockaddr *)&src,
  329                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
  330                 if ((stcb != NULL) &&
  331                     (net != NULL) &&
  332                     (inp != NULL)) {
  333                         /* Check the verification tag */
  334                         if (ntohl(sh.v_tag) != 0) {
  335                                 /*
  336                                  * This must be the verification tag used
  337                                  * for sending out packets. We don't
  338                                  * consider packets reflecting the
  339                                  * verification tag.
  340                                  */
  341                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
  342                                         SCTP_TCB_UNLOCK(stcb);
  343                                         return;
  344                                 }
  345                         } else {
  346                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
  347                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
  348                                     sizeof(struct sctp_chunkhdr) +
  349                                     offsetof(struct sctp_init, a_rwnd)) {
  350                                         /*
  351                                          * In this case we can check if we
  352                                          * got an INIT chunk and if the
  353                                          * initiate tag matches.
  354                                          */
  355                                         uint32_t initiate_tag;
  356                                         uint8_t chunk_type;
  357 
  358                                         m_copydata(ip6cp->ip6c_m,
  359                                             ip6cp->ip6c_off +
  360                                             sizeof(struct sctphdr),
  361                                             sizeof(uint8_t),
  362                                             (caddr_t)&chunk_type);
  363                                         m_copydata(ip6cp->ip6c_m,
  364                                             ip6cp->ip6c_off +
  365                                             sizeof(struct sctphdr) +
  366                                             sizeof(struct sctp_chunkhdr),
  367                                             sizeof(uint32_t),
  368                                             (caddr_t)&initiate_tag);
  369                                         if ((chunk_type != SCTP_INITIATION) ||
  370                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
  371                                                 SCTP_TCB_UNLOCK(stcb);
  372                                                 return;
  373                                         }
  374                                 } else {
  375                                         SCTP_TCB_UNLOCK(stcb);
  376                                         return;
  377                                 }
  378                         }
  379                         sctp6_notify(inp, stcb, net,
  380                             ip6cp->ip6c_icmp6->icmp6_type,
  381                             ip6cp->ip6c_icmp6->icmp6_code,
  382                             ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
  383                 } else {
  384                         if ((stcb == NULL) && (inp != NULL)) {
  385                                 /* reduce inp's ref-count */
  386                                 SCTP_INP_WLOCK(inp);
  387                                 SCTP_INP_DECR_REF(inp);
  388                                 SCTP_INP_WUNLOCK(inp);
  389                         }
  390                         if (stcb) {
  391                                 SCTP_TCB_UNLOCK(stcb);
  392                         }
  393                 }
  394         }
  395 }
  396 
  397 /*
  398  * this routine can probably be collasped into the one in sctp_userreq.c
  399  * since they do the same thing and now we lookup with a sockaddr
  400  */
  401 static int
  402 sctp6_getcred(SYSCTL_HANDLER_ARGS)
  403 {
  404         struct xucred xuc;
  405         struct sockaddr_in6 addrs[2];
  406         struct sctp_inpcb *inp;
  407         struct sctp_nets *net;
  408         struct sctp_tcb *stcb;
  409         int error;
  410         uint32_t vrf_id;
  411 
  412         vrf_id = SCTP_DEFAULT_VRFID;
  413 
  414         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  415         if (error)
  416                 return (error);
  417 
  418         if (req->newlen != sizeof(addrs)) {
  419                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  420                 return (EINVAL);
  421         }
  422         if (req->oldlen != sizeof(struct ucred)) {
  423                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  424                 return (EINVAL);
  425         }
  426         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  427         if (error)
  428                 return (error);
  429 
  430         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
  431             sin6tosa(&addrs[0]),
  432             &inp, &net, 1, vrf_id);
  433         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
  434                 if ((inp != NULL) && (stcb == NULL)) {
  435                         /* reduce ref-count */
  436                         SCTP_INP_WLOCK(inp);
  437                         SCTP_INP_DECR_REF(inp);
  438                         goto cred_can_cont;
  439                 }
  440                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  441                 error = ENOENT;
  442                 goto out;
  443         }
  444         SCTP_TCB_UNLOCK(stcb);
  445         /*
  446          * We use the write lock here, only since in the error leg we need
  447          * it. If we used RLOCK, then we would have to
  448          * wlock/decr/unlock/rlock. Which in theory could create a hole.
  449          * Better to use higher wlock.
  450          */
  451         SCTP_INP_WLOCK(inp);
  452 cred_can_cont:
  453         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
  454         if (error) {
  455                 SCTP_INP_WUNLOCK(inp);
  456                 goto out;
  457         }
  458         cru2x(inp->sctp_socket->so_cred, &xuc);
  459         SCTP_INP_WUNLOCK(inp);
  460         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  461 out:
  462         return (error);
  463 }
  464 
  465 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
  466     0, 0,
  467     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
  468 
  469 
  470 /* This is the same as the sctp_abort() could be made common */
  471 static void
  472 sctp6_abort(struct socket *so)
  473 {
  474         struct sctp_inpcb *inp;
  475         uint32_t flags;
  476 
  477         inp = (struct sctp_inpcb *)so->so_pcb;
  478         if (inp == NULL) {
  479                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  480                 return;
  481         }
  482 sctp_must_try_again:
  483         flags = inp->sctp_flags;
  484 #ifdef SCTP_LOG_CLOSING
  485         sctp_log_closing(inp, NULL, 17);
  486 #endif
  487         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
  488             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
  489 #ifdef SCTP_LOG_CLOSING
  490                 sctp_log_closing(inp, NULL, 16);
  491 #endif
  492                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
  493                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
  494                 SOCK_LOCK(so);
  495                 SCTP_SB_CLEAR(so->so_snd);
  496                 /*
  497                  * same for the rcv ones, they are only here for the
  498                  * accounting/select.
  499                  */
  500                 SCTP_SB_CLEAR(so->so_rcv);
  501                 /* Now null out the reference, we are completely detached. */
  502                 so->so_pcb = NULL;
  503                 SOCK_UNLOCK(so);
  504         } else {
  505                 flags = inp->sctp_flags;
  506                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
  507                         goto sctp_must_try_again;
  508                 }
  509         }
  510         return;
  511 }
  512 
  513 static int
  514 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
  515 {
  516         struct in6pcb *inp6;
  517         int error;
  518         struct sctp_inpcb *inp;
  519         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
  520 
  521         inp = (struct sctp_inpcb *)so->so_pcb;
  522         if (inp != NULL) {
  523                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  524                 return (EINVAL);
  525         }
  526         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  527                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
  528                 if (error)
  529                         return (error);
  530         }
  531         error = sctp_inpcb_alloc(so, vrf_id);
  532         if (error)
  533                 return (error);
  534         inp = (struct sctp_inpcb *)so->so_pcb;
  535         SCTP_INP_WLOCK(inp);
  536         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
  537         inp6 = (struct in6pcb *)inp;
  538 
  539         inp6->inp_vflag |= INP_IPV6;
  540         inp6->in6p_hops = -1;   /* use kernel default */
  541         inp6->in6p_cksum = -1;  /* just to be sure */
  542 #ifdef INET
  543         /*
  544          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
  545          * socket as well, because the socket may be bound to an IPv6
  546          * wildcard address, which may match an IPv4-mapped IPv6 address.
  547          */
  548         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
  549 #endif
  550         SCTP_INP_WUNLOCK(inp);
  551         return (0);
  552 }
  553 
  554 static int
  555 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
  556 {
  557         struct sctp_inpcb *inp;
  558         struct in6pcb *inp6;
  559         int error;
  560         u_char vflagsav;
  561 
  562         inp = (struct sctp_inpcb *)so->so_pcb;
  563         if (inp == NULL) {
  564                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  565                 return (EINVAL);
  566         }
  567         if (addr) {
  568                 switch (addr->sa_family) {
  569 #ifdef INET
  570                 case AF_INET:
  571                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
  572                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  573                                 return (EINVAL);
  574                         }
  575                         break;
  576 #endif
  577 #ifdef INET6
  578                 case AF_INET6:
  579                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  580                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  581                                 return (EINVAL);
  582                         }
  583                         break;
  584 #endif
  585                 default:
  586                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  587                         return (EINVAL);
  588                 }
  589         }
  590         inp6 = (struct in6pcb *)inp;
  591         vflagsav = inp6->inp_vflag;
  592         inp6->inp_vflag &= ~INP_IPV4;
  593         inp6->inp_vflag |= INP_IPV6;
  594         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
  595                 switch (addr->sa_family) {
  596 #ifdef INET
  597                 case AF_INET:
  598                         /* binding v4 addr to v6 socket, so reset flags */
  599                         inp6->inp_vflag |= INP_IPV4;
  600                         inp6->inp_vflag &= ~INP_IPV6;
  601                         break;
  602 #endif
  603 #ifdef INET6
  604                 case AF_INET6:
  605                         {
  606                                 struct sockaddr_in6 *sin6_p;
  607 
  608                                 sin6_p = (struct sockaddr_in6 *)addr;
  609 
  610                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
  611                                         inp6->inp_vflag |= INP_IPV4;
  612                                 }
  613 #ifdef INET
  614                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  615                                         struct sockaddr_in sin;
  616 
  617                                         in6_sin6_2_sin(&sin, sin6_p);
  618                                         inp6->inp_vflag |= INP_IPV4;
  619                                         inp6->inp_vflag &= ~INP_IPV6;
  620                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
  621                                         goto out;
  622                                 }
  623 #endif
  624                                 break;
  625                         }
  626 #endif
  627                 default:
  628                         break;
  629                 }
  630         } else if (addr != NULL) {
  631                 struct sockaddr_in6 *sin6_p;
  632 
  633                 /* IPV6_V6ONLY socket */
  634 #ifdef INET
  635                 if (addr->sa_family == AF_INET) {
  636                         /* can't bind v4 addr to v6 only socket! */
  637                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  638                         error = EINVAL;
  639                         goto out;
  640                 }
  641 #endif
  642                 sin6_p = (struct sockaddr_in6 *)addr;
  643 
  644                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  645                         /* can't bind v4-mapped addrs either! */
  646                         /* NOTE: we don't support SIIT */
  647                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  648                         error = EINVAL;
  649                         goto out;
  650                 }
  651         }
  652         error = sctp_inpcb_bind(so, addr, NULL, p);
  653 out:
  654         if (error != 0)
  655                 inp6->inp_vflag = vflagsav;
  656         return (error);
  657 }
  658 
  659 
  660 static void
  661 sctp6_close(struct socket *so)
  662 {
  663         sctp_close(so);
  664 }
  665 
  666 /* This could be made common with sctp_detach() since they are identical */
  667 
  668 static
  669 int
  670 sctp6_disconnect(struct socket *so)
  671 {
  672         return (sctp_disconnect(so));
  673 }
  674 
  675 
  676 int
  677 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  678     struct mbuf *control, struct thread *p);
  679 
  680 
  681 static int
  682 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  683     struct mbuf *control, struct thread *p)
  684 {
  685         struct sctp_inpcb *inp;
  686         struct in6pcb *inp6;
  687 
  688 #ifdef INET
  689         struct sockaddr_in6 *sin6;
  690 #endif                          /* INET */
  691         /* No SPL needed since sctp_output does this */
  692 
  693         inp = (struct sctp_inpcb *)so->so_pcb;
  694         if (inp == NULL) {
  695                 if (control) {
  696                         SCTP_RELEASE_PKT(control);
  697                         control = NULL;
  698                 }
  699                 SCTP_RELEASE_PKT(m);
  700                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  701                 return (EINVAL);
  702         }
  703         inp6 = (struct in6pcb *)inp;
  704         /*
  705          * For the TCP model we may get a NULL addr, if we are a connected
  706          * socket thats ok.
  707          */
  708         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
  709             (addr == NULL)) {
  710                 goto connected_type;
  711         }
  712         if (addr == NULL) {
  713                 SCTP_RELEASE_PKT(m);
  714                 if (control) {
  715                         SCTP_RELEASE_PKT(control);
  716                         control = NULL;
  717                 }
  718                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
  719                 return (EDESTADDRREQ);
  720         }
  721 #ifdef INET
  722         sin6 = (struct sockaddr_in6 *)addr;
  723         if (SCTP_IPV6_V6ONLY(inp6)) {
  724                 /*
  725                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
  726                  * v4 addr or v4-mapped addr
  727                  */
  728                 if (addr->sa_family == AF_INET) {
  729                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  730                         return (EINVAL);
  731                 }
  732                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  733                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  734                         return (EINVAL);
  735                 }
  736         }
  737         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  738                 struct sockaddr_in sin;
  739 
  740                 /* convert v4-mapped into v4 addr and send */
  741                 in6_sin6_2_sin(&sin, sin6);
  742                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
  743         }
  744 #endif                          /* INET */
  745 connected_type:
  746         /* now what about control */
  747         if (control) {
  748                 if (inp->control) {
  749                         SCTP_PRINTF("huh? control set?\n");
  750                         SCTP_RELEASE_PKT(inp->control);
  751                         inp->control = NULL;
  752                 }
  753                 inp->control = control;
  754         }
  755         /* Place the data */
  756         if (inp->pkt) {
  757                 SCTP_BUF_NEXT(inp->pkt_last) = m;
  758                 inp->pkt_last = m;
  759         } else {
  760                 inp->pkt_last = inp->pkt = m;
  761         }
  762         if (
  763         /* FreeBSD and MacOSX uses a flag passed */
  764             ((flags & PRUS_MORETOCOME) == 0)
  765             ) {
  766                 /*
  767                  * note with the current version this code will only be used
  768                  * by OpenBSD, NetBSD and FreeBSD have methods for
  769                  * re-defining sosend() to use sctp_sosend().  One can
  770                  * optionaly switch back to this code (by changing back the
  771                  * defininitions but this is not advisable.
  772                  */
  773                 int ret;
  774 
  775                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
  776                 inp->pkt = NULL;
  777                 inp->control = NULL;
  778                 return (ret);
  779         } else {
  780                 return (0);
  781         }
  782 }
  783 
  784 static int
  785 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
  786 {
  787         uint32_t vrf_id;
  788         int error = 0;
  789         struct sctp_inpcb *inp;
  790         struct sctp_tcb *stcb;
  791 #ifdef INET
  792         struct in6pcb *inp6;
  793         struct sockaddr_in6 *sin6;
  794         union sctp_sockstore store;
  795 #endif
  796 
  797 #ifdef INET
  798         inp6 = (struct in6pcb *)so->so_pcb;
  799 #endif
  800         inp = (struct sctp_inpcb *)so->so_pcb;
  801         if (inp == NULL) {
  802                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  803                 return (ECONNRESET);    /* I made the same as TCP since we are
  804                                          * not setup? */
  805         }
  806         if (addr == NULL) {
  807                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  808                 return (EINVAL);
  809         }
  810         switch (addr->sa_family) {
  811 #ifdef INET
  812         case AF_INET:
  813                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
  814                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  815                         return (EINVAL);
  816                 }
  817                 break;
  818 #endif
  819 #ifdef INET6
  820         case AF_INET6:
  821                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  822                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  823                         return (EINVAL);
  824                 }
  825                 break;
  826 #endif
  827         default:
  828                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  829                 return (EINVAL);
  830         }
  831 
  832         vrf_id = inp->def_vrf_id;
  833         SCTP_ASOC_CREATE_LOCK(inp);
  834         SCTP_INP_RLOCK(inp);
  835         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
  836             SCTP_PCB_FLAGS_UNBOUND) {
  837                 /* Bind a ephemeral port */
  838                 SCTP_INP_RUNLOCK(inp);
  839                 error = sctp6_bind(so, NULL, p);
  840                 if (error) {
  841                         SCTP_ASOC_CREATE_UNLOCK(inp);
  842 
  843                         return (error);
  844                 }
  845                 SCTP_INP_RLOCK(inp);
  846         }
  847         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
  848             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
  849                 /* We are already connected AND the TCP model */
  850                 SCTP_INP_RUNLOCK(inp);
  851                 SCTP_ASOC_CREATE_UNLOCK(inp);
  852                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
  853                 return (EADDRINUSE);
  854         }
  855 #ifdef INET
  856         sin6 = (struct sockaddr_in6 *)addr;
  857         if (SCTP_IPV6_V6ONLY(inp6)) {
  858                 /*
  859                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
  860                  * addr or v4-mapped addr
  861                  */
  862                 if (addr->sa_family == AF_INET) {
  863                         SCTP_INP_RUNLOCK(inp);
  864                         SCTP_ASOC_CREATE_UNLOCK(inp);
  865                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  866                         return (EINVAL);
  867                 }
  868                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  869                         SCTP_INP_RUNLOCK(inp);
  870                         SCTP_ASOC_CREATE_UNLOCK(inp);
  871                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  872                         return (EINVAL);
  873                 }
  874         }
  875         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  876                 /* convert v4-mapped into v4 addr */
  877                 in6_sin6_2_sin(&store.sin, sin6);
  878                 addr = &store.sa;
  879         }
  880 #endif                          /* INET */
  881         /* Now do we connect? */
  882         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
  883                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
  884                 if (stcb) {
  885                         SCTP_TCB_LOCK(stcb);
  886                 }
  887                 SCTP_INP_RUNLOCK(inp);
  888         } else {
  889                 SCTP_INP_RUNLOCK(inp);
  890                 SCTP_INP_WLOCK(inp);
  891                 SCTP_INP_INCR_REF(inp);
  892                 SCTP_INP_WUNLOCK(inp);
  893                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
  894                 if (stcb == NULL) {
  895                         SCTP_INP_WLOCK(inp);
  896                         SCTP_INP_DECR_REF(inp);
  897                         SCTP_INP_WUNLOCK(inp);
  898                 }
  899         }
  900 
  901         if (stcb != NULL) {
  902                 /* Already have or am bring up an association */
  903                 SCTP_ASOC_CREATE_UNLOCK(inp);
  904                 SCTP_TCB_UNLOCK(stcb);
  905                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
  906                 return (EALREADY);
  907         }
  908         /* We are GOOD to go */
  909         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
  910             inp->sctp_ep.pre_open_stream_count,
  911             inp->sctp_ep.port, p);
  912         SCTP_ASOC_CREATE_UNLOCK(inp);
  913         if (stcb == NULL) {
  914                 /* Gak! no memory */
  915                 return (error);
  916         }
  917         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
  918                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
  919                 /* Set the connected flag so we can queue data */
  920                 soisconnecting(so);
  921         }
  922         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
  923         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
  924 
  925         /* initialize authentication parameters for the assoc */
  926         sctp_initialize_auth_params(inp, stcb);
  927 
  928         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
  929         SCTP_TCB_UNLOCK(stcb);
  930         return (error);
  931 }
  932 
  933 static int
  934 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
  935 {
  936         struct sockaddr_in6 *sin6;
  937         struct sctp_inpcb *inp;
  938         uint32_t vrf_id;
  939         struct sctp_ifa *sctp_ifa;
  940 
  941         int error;
  942 
  943         /*
  944          * Do the malloc first in case it blocks.
  945          */
  946         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
  947         if (sin6 == NULL)
  948                 return (ENOMEM);
  949         sin6->sin6_family = AF_INET6;
  950         sin6->sin6_len = sizeof(*sin6);
  951 
  952         inp = (struct sctp_inpcb *)so->so_pcb;
  953         if (inp == NULL) {
  954                 SCTP_FREE_SONAME(sin6);
  955                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  956                 return (ECONNRESET);
  957         }
  958         SCTP_INP_RLOCK(inp);
  959         sin6->sin6_port = inp->sctp_lport;
  960         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
  961                 /* For the bound all case you get back 0 */
  962                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
  963                         struct sctp_tcb *stcb;
  964                         struct sockaddr_in6 *sin_a6;
  965                         struct sctp_nets *net;
  966                         int fnd;
  967 
  968                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
  969                         if (stcb == NULL) {
  970                                 SCTP_INP_RUNLOCK(inp);
  971                                 SCTP_FREE_SONAME(sin6);
  972                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  973                                 return (ENOENT);
  974                         }
  975                         fnd = 0;
  976                         sin_a6 = NULL;
  977                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  978                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
  979                                 if (sin_a6 == NULL)
  980                                         /* this will make coverity happy */
  981                                         continue;
  982 
  983                                 if (sin_a6->sin6_family == AF_INET6) {
  984                                         fnd = 1;
  985                                         break;
  986                                 }
  987                         }
  988                         if ((!fnd) || (sin_a6 == NULL)) {
  989                                 /* punt */
  990                                 SCTP_INP_RUNLOCK(inp);
  991                                 SCTP_FREE_SONAME(sin6);
  992                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  993                                 return (ENOENT);
  994                         }
  995                         vrf_id = inp->def_vrf_id;
  996                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
  997                         if (sctp_ifa) {
  998                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
  999                         }
 1000                 } else {
 1001                         /* For the bound all case you get back 0 */
 1002                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
 1003                 }
 1004         } else {
 1005                 /* Take the first IPv6 address in the list */
 1006                 struct sctp_laddr *laddr;
 1007                 int fnd = 0;
 1008 
 1009                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 1010                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
 1011                                 struct sockaddr_in6 *sin_a;
 1012 
 1013                                 sin_a = &laddr->ifa->address.sin6;
 1014                                 sin6->sin6_addr = sin_a->sin6_addr;
 1015                                 fnd = 1;
 1016                                 break;
 1017                         }
 1018                 }
 1019                 if (!fnd) {
 1020                         SCTP_FREE_SONAME(sin6);
 1021                         SCTP_INP_RUNLOCK(inp);
 1022                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1023                         return (ENOENT);
 1024                 }
 1025         }
 1026         SCTP_INP_RUNLOCK(inp);
 1027         /* Scoping things for v6 */
 1028         if ((error = sa6_recoverscope(sin6)) != 0) {
 1029                 SCTP_FREE_SONAME(sin6);
 1030                 return (error);
 1031         }
 1032         (*addr) = (struct sockaddr *)sin6;
 1033         return (0);
 1034 }
 1035 
 1036 static int
 1037 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
 1038 {
 1039         struct sockaddr_in6 *sin6;
 1040         int fnd;
 1041         struct sockaddr_in6 *sin_a6;
 1042         struct sctp_inpcb *inp;
 1043         struct sctp_tcb *stcb;
 1044         struct sctp_nets *net;
 1045         int error;
 1046 
 1047         /* Do the malloc first in case it blocks. */
 1048         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1049         if (sin6 == NULL)
 1050                 return (ENOMEM);
 1051         sin6->sin6_family = AF_INET6;
 1052         sin6->sin6_len = sizeof(*sin6);
 1053 
 1054         inp = (struct sctp_inpcb *)so->so_pcb;
 1055         if ((inp == NULL) ||
 1056             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 1057                 /* UDP type and listeners will drop out here */
 1058                 SCTP_FREE_SONAME(sin6);
 1059                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
 1060                 return (ENOTCONN);
 1061         }
 1062         SCTP_INP_RLOCK(inp);
 1063         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1064         if (stcb) {
 1065                 SCTP_TCB_LOCK(stcb);
 1066         }
 1067         SCTP_INP_RUNLOCK(inp);
 1068         if (stcb == NULL) {
 1069                 SCTP_FREE_SONAME(sin6);
 1070                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 1071                 return (ECONNRESET);
 1072         }
 1073         fnd = 0;
 1074         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 1075                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1076                 if (sin_a6->sin6_family == AF_INET6) {
 1077                         fnd = 1;
 1078                         sin6->sin6_port = stcb->rport;
 1079                         sin6->sin6_addr = sin_a6->sin6_addr;
 1080                         break;
 1081                 }
 1082         }
 1083         SCTP_TCB_UNLOCK(stcb);
 1084         if (!fnd) {
 1085                 /* No IPv4 address */
 1086                 SCTP_FREE_SONAME(sin6);
 1087                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1088                 return (ENOENT);
 1089         }
 1090         if ((error = sa6_recoverscope(sin6)) != 0) {
 1091                 SCTP_FREE_SONAME(sin6);
 1092                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
 1093                 return (error);
 1094         }
 1095         *addr = (struct sockaddr *)sin6;
 1096         return (0);
 1097 }
 1098 
 1099 static int
 1100 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
 1101 {
 1102         struct in6pcb *inp6 = sotoin6pcb(so);
 1103         int error;
 1104 
 1105         if (inp6 == NULL) {
 1106                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1107                 return (EINVAL);
 1108         }
 1109         /* allow v6 addresses precedence */
 1110         error = sctp6_getaddr(so, nam);
 1111 #ifdef INET
 1112         if (error) {
 1113                 struct sockaddr_in6 *sin6;
 1114 
 1115                 /* try v4 next if v6 failed */
 1116                 error = sctp_ingetaddr(so, nam);
 1117                 if (error) {
 1118                         return (error);
 1119                 }
 1120                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1121                 if (sin6 == NULL) {
 1122                         SCTP_FREE_SONAME(*nam);
 1123                         return (ENOMEM);
 1124                 }
 1125                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
 1126                 SCTP_FREE_SONAME(*nam);
 1127                 *nam = (struct sockaddr *)sin6;
 1128         }
 1129 #endif
 1130         return (error);
 1131 }
 1132 
 1133 
 1134 static int
 1135 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
 1136 {
 1137         struct in6pcb *inp6 = sotoin6pcb(so);
 1138         int error;
 1139 
 1140         if (inp6 == NULL) {
 1141                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1142                 return (EINVAL);
 1143         }
 1144         /* allow v6 addresses precedence */
 1145         error = sctp6_peeraddr(so, nam);
 1146 #ifdef INET
 1147         if (error) {
 1148                 struct sockaddr_in6 *sin6;
 1149 
 1150                 /* try v4 next if v6 failed */
 1151                 error = sctp_peeraddr(so, nam);
 1152                 if (error) {
 1153                         return (error);
 1154                 }
 1155                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1156                 if (sin6 == NULL) {
 1157                         SCTP_FREE_SONAME(*nam);
 1158                         return (ENOMEM);
 1159                 }
 1160                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
 1161                 SCTP_FREE_SONAME(*nam);
 1162                 *nam = (struct sockaddr *)sin6;
 1163         }
 1164 #endif
 1165         return (error);
 1166 }
 1167 
 1168 struct pr_usrreqs sctp6_usrreqs = {
 1169         .pru_abort = sctp6_abort,
 1170         .pru_accept = sctp_accept,
 1171         .pru_attach = sctp6_attach,
 1172         .pru_bind = sctp6_bind,
 1173         .pru_connect = sctp6_connect,
 1174         .pru_control = in6_control,
 1175         .pru_close = sctp6_close,
 1176         .pru_detach = sctp6_close,
 1177         .pru_sopoll = sopoll_generic,
 1178         .pru_flush = sctp_flush,
 1179         .pru_disconnect = sctp6_disconnect,
 1180         .pru_listen = sctp_listen,
 1181         .pru_peeraddr = sctp6_getpeeraddr,
 1182         .pru_send = sctp6_send,
 1183         .pru_shutdown = sctp_shutdown,
 1184         .pru_sockaddr = sctp6_in6getaddr,
 1185         .pru_sosend = sctp_sosend,
 1186         .pru_soreceive = sctp_soreceive
 1187 };
 1188 
 1189 #endif

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