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/11.0/sys/netinet6/sctp6_usrreq.c 302138 2016-06-23 09:13:15Z tuexen $");
   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 #ifdef IPSEC
   59 #include <netipsec/ipsec.h>
   60 #include <netipsec/ipsec6.h>
   61 #endif                          /* IPSEC */
   62 
   63 extern struct protosw inetsw[];
   64 
   65 int
   66 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
   67 {
   68         struct mbuf *m;
   69         int iphlen;
   70         uint32_t vrf_id;
   71         uint8_t ecn_bits;
   72         struct sockaddr_in6 src, dst;
   73         struct ip6_hdr *ip6;
   74         struct sctphdr *sh;
   75         struct sctp_chunkhdr *ch;
   76         int length, offset;
   77 
   78 #if !defined(SCTP_WITH_NO_CSUM)
   79         uint8_t compute_crc;
   80 
   81 #endif
   82         uint32_t mflowid;
   83         uint8_t mflowtype;
   84         uint16_t fibnum;
   85 
   86         iphlen = *offp;
   87         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
   88                 SCTP_RELEASE_PKT(*i_pak);
   89                 return (IPPROTO_DONE);
   90         }
   91         m = SCTP_HEADER_TO_CHAIN(*i_pak);
   92 #ifdef SCTP_MBUF_LOGGING
   93         /* Log in any input mbufs */
   94         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
   95                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
   96         }
   97 #endif
   98 #ifdef SCTP_PACKET_LOGGING
   99         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  100                 sctp_packet_log(m);
  101         }
  102 #endif
  103         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  104             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
  105             m->m_pkthdr.len,
  106             if_name(m->m_pkthdr.rcvif),
  107             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
  108         mflowid = m->m_pkthdr.flowid;
  109         mflowtype = M_HASHTYPE_GET(m);
  110         fibnum = M_GETFIB(m);
  111         SCTP_STAT_INCR(sctps_recvpackets);
  112         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
  113         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
  114         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
  115         ip6 = mtod(m, struct ip6_hdr *);
  116         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
  117             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
  118         if (sh == NULL) {
  119                 SCTP_STAT_INCR(sctps_hdrops);
  120                 return (IPPROTO_DONE);
  121         }
  122         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
  123         offset -= sizeof(struct sctp_chunkhdr);
  124         memset(&src, 0, sizeof(struct sockaddr_in6));
  125         src.sin6_family = AF_INET6;
  126         src.sin6_len = sizeof(struct sockaddr_in6);
  127         src.sin6_port = sh->src_port;
  128         src.sin6_addr = ip6->ip6_src;
  129         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  130                 goto out;
  131         }
  132         memset(&dst, 0, sizeof(struct sockaddr_in6));
  133         dst.sin6_family = AF_INET6;
  134         dst.sin6_len = sizeof(struct sockaddr_in6);
  135         dst.sin6_port = sh->dest_port;
  136         dst.sin6_addr = ip6->ip6_dst;
  137         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  138                 goto out;
  139         }
  140         length = ntohs(ip6->ip6_plen) + iphlen;
  141         /* Validate mbuf chain length with IP payload length. */
  142         if (SCTP_HEADER_LEN(m) != length) {
  143                 SCTPDBG(SCTP_DEBUG_INPUT1,
  144                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
  145                 SCTP_STAT_INCR(sctps_hdrops);
  146                 goto out;
  147         }
  148         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  149                 goto out;
  150         }
  151         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
  152 #if defined(SCTP_WITH_NO_CSUM)
  153         SCTP_STAT_INCR(sctps_recvnocrc);
  154 #else
  155         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
  156                 SCTP_STAT_INCR(sctps_recvhwcrc);
  157                 compute_crc = 0;
  158         } else {
  159                 SCTP_STAT_INCR(sctps_recvswcrc);
  160                 compute_crc = 1;
  161         }
  162 #endif
  163         sctp_common_input_processing(&m, iphlen, offset, length,
  164             (struct sockaddr *)&src,
  165             (struct sockaddr *)&dst,
  166             sh, ch,
  167 #if !defined(SCTP_WITH_NO_CSUM)
  168             compute_crc,
  169 #endif
  170             ecn_bits,
  171             mflowtype, mflowid, fibnum,
  172             vrf_id, port);
  173 out:
  174         if (m) {
  175                 sctp_m_freem(m);
  176         }
  177         return (IPPROTO_DONE);
  178 }
  179 
  180 
  181 int
  182 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
  183 {
  184         return (sctp6_input_with_port(i_pak, offp, 0));
  185 }
  186 
  187 void
  188 sctp6_notify(struct sctp_inpcb *inp,
  189     struct sctp_tcb *stcb,
  190     struct sctp_nets *net,
  191     uint8_t icmp6_type,
  192     uint8_t icmp6_code,
  193     uint16_t next_mtu)
  194 {
  195 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  196         struct socket *so;
  197 
  198 #endif
  199         int timer_stopped;
  200 
  201         switch (icmp6_type) {
  202         case ICMP6_DST_UNREACH:
  203                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
  204                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
  205                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
  206                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
  207                         /* Mark the net unreachable. */
  208                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
  209                                 /* Ok that destination is not reachable */
  210                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
  211                                 net->dest_state &= ~SCTP_ADDR_PF;
  212                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  213                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
  214                         }
  215                 }
  216                 SCTP_TCB_UNLOCK(stcb);
  217                 break;
  218         case ICMP6_PARAM_PROB:
  219                 /* Treat it like an ABORT. */
  220                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
  221                         sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
  222 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  223                         so = SCTP_INP_SO(inp);
  224                         atomic_add_int(&stcb->asoc.refcnt, 1);
  225                         SCTP_TCB_UNLOCK(stcb);
  226                         SCTP_SOCKET_LOCK(so, 1);
  227                         SCTP_TCB_LOCK(stcb);
  228                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  229 #endif
  230                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
  231                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
  232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  233                         SCTP_SOCKET_UNLOCK(so, 1);
  234 #endif
  235                 } else {
  236                         SCTP_TCB_UNLOCK(stcb);
  237                 }
  238                 break;
  239         case ICMP6_PACKET_TOO_BIG:
  240                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
  241                         timer_stopped = 1;
  242                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
  243                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
  244                 } else {
  245                         timer_stopped = 0;
  246                 }
  247                 /* Update the path MTU. */
  248                 if (net->mtu > next_mtu) {
  249                         net->mtu = next_mtu;
  250                         if (net->port) {
  251                                 net->mtu -= sizeof(struct udphdr);
  252                         }
  253                 }
  254                 /* Update the association MTU */
  255                 if (stcb->asoc.smallest_mtu > next_mtu) {
  256                         sctp_pathmtu_adjustment(stcb, next_mtu);
  257                 }
  258                 /* Finally, start the PMTU timer if it was running before. */
  259                 if (timer_stopped) {
  260                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
  261                 }
  262                 SCTP_TCB_UNLOCK(stcb);
  263                 break;
  264         default:
  265                 SCTP_TCB_UNLOCK(stcb);
  266                 break;
  267         }
  268 }
  269 
  270 void
  271 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
  272 {
  273         struct ip6ctlparam *ip6cp;
  274         struct sctp_inpcb *inp;
  275         struct sctp_tcb *stcb;
  276         struct sctp_nets *net;
  277         struct sctphdr sh;
  278         struct sockaddr_in6 src, dst;
  279 
  280         if (pktdst->sa_family != AF_INET6 ||
  281             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
  282                 return;
  283         }
  284         if ((unsigned)cmd >= PRC_NCMDS) {
  285                 return;
  286         }
  287         if (PRC_IS_REDIRECT(cmd)) {
  288                 d = NULL;
  289         } else if (inet6ctlerrmap[cmd] == 0) {
  290                 return;
  291         }
  292         /* If the parameter is from icmp6, decode it. */
  293         if (d != NULL) {
  294                 ip6cp = (struct ip6ctlparam *)d;
  295         } else {
  296                 ip6cp = (struct ip6ctlparam *)NULL;
  297         }
  298 
  299         if (ip6cp != NULL) {
  300                 /*
  301                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
  302                  * valid.
  303                  */
  304                 if (ip6cp->ip6c_m == NULL) {
  305                         return;
  306                 }
  307                 /*
  308                  * Check if we can safely examine the ports and the
  309                  * verification tag of the SCTP common header.
  310                  */
  311                 if (ip6cp->ip6c_m->m_pkthdr.len <
  312                     (int32_t) (ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
  313                         return;
  314                 }
  315                 /* Copy out the port numbers and the verification tag. */
  316                 bzero(&sh, sizeof(sh));
  317                 m_copydata(ip6cp->ip6c_m,
  318                     ip6cp->ip6c_off,
  319                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
  320                     (caddr_t)&sh);
  321                 memset(&src, 0, sizeof(struct sockaddr_in6));
  322                 src.sin6_family = AF_INET6;
  323                 src.sin6_len = sizeof(struct sockaddr_in6);
  324                 src.sin6_port = sh.src_port;
  325                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
  326                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
  327                         return;
  328                 }
  329                 memset(&dst, 0, sizeof(struct sockaddr_in6));
  330                 dst.sin6_family = AF_INET6;
  331                 dst.sin6_len = sizeof(struct sockaddr_in6);
  332                 dst.sin6_port = sh.dest_port;
  333                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
  334                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
  335                         return;
  336                 }
  337                 inp = NULL;
  338                 net = NULL;
  339                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
  340                     (struct sockaddr *)&src,
  341                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
  342                 if ((stcb != NULL) &&
  343                     (net != NULL) &&
  344                     (inp != NULL)) {
  345                         /* Check the verification tag */
  346                         if (ntohl(sh.v_tag) != 0) {
  347                                 /*
  348                                  * This must be the verification tag used
  349                                  * for sending out packets. We don't
  350                                  * consider packets reflecting the
  351                                  * verification tag.
  352                                  */
  353                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
  354                                         SCTP_TCB_UNLOCK(stcb);
  355                                         return;
  356                                 }
  357                         } else {
  358                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
  359                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
  360                                     sizeof(struct sctp_chunkhdr) +
  361                                     offsetof(struct sctp_init, a_rwnd)) {
  362                                         /*
  363                                          * In this case we can check if we
  364                                          * got an INIT chunk and if the
  365                                          * initiate tag matches.
  366                                          */
  367                                         uint32_t initiate_tag;
  368                                         uint8_t chunk_type;
  369 
  370                                         m_copydata(ip6cp->ip6c_m,
  371                                             ip6cp->ip6c_off +
  372                                             sizeof(struct sctphdr),
  373                                             sizeof(uint8_t),
  374                                             (caddr_t)&chunk_type);
  375                                         m_copydata(ip6cp->ip6c_m,
  376                                             ip6cp->ip6c_off +
  377                                             sizeof(struct sctphdr) +
  378                                             sizeof(struct sctp_chunkhdr),
  379                                             sizeof(uint32_t),
  380                                             (caddr_t)&initiate_tag);
  381                                         if ((chunk_type != SCTP_INITIATION) ||
  382                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
  383                                                 SCTP_TCB_UNLOCK(stcb);
  384                                                 return;
  385                                         }
  386                                 } else {
  387                                         SCTP_TCB_UNLOCK(stcb);
  388                                         return;
  389                                 }
  390                         }
  391                         sctp6_notify(inp, stcb, net,
  392                             ip6cp->ip6c_icmp6->icmp6_type,
  393                             ip6cp->ip6c_icmp6->icmp6_code,
  394                             (uint16_t) ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
  395                 } else {
  396                         if ((stcb == NULL) && (inp != NULL)) {
  397                                 /* reduce inp's ref-count */
  398                                 SCTP_INP_WLOCK(inp);
  399                                 SCTP_INP_DECR_REF(inp);
  400                                 SCTP_INP_WUNLOCK(inp);
  401                         }
  402                         if (stcb) {
  403                                 SCTP_TCB_UNLOCK(stcb);
  404                         }
  405                 }
  406         }
  407 }
  408 
  409 /*
  410  * this routine can probably be collasped into the one in sctp_userreq.c
  411  * since they do the same thing and now we lookup with a sockaddr
  412  */
  413 static int
  414 sctp6_getcred(SYSCTL_HANDLER_ARGS)
  415 {
  416         struct xucred xuc;
  417         struct sockaddr_in6 addrs[2];
  418         struct sctp_inpcb *inp;
  419         struct sctp_nets *net;
  420         struct sctp_tcb *stcb;
  421         int error;
  422         uint32_t vrf_id;
  423 
  424         vrf_id = SCTP_DEFAULT_VRFID;
  425 
  426         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  427         if (error)
  428                 return (error);
  429 
  430         if (req->newlen != sizeof(addrs)) {
  431                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  432                 return (EINVAL);
  433         }
  434         if (req->oldlen != sizeof(struct ucred)) {
  435                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  436                 return (EINVAL);
  437         }
  438         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  439         if (error)
  440                 return (error);
  441 
  442         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
  443             sin6tosa(&addrs[0]),
  444             &inp, &net, 1, vrf_id);
  445         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
  446                 if ((inp != NULL) && (stcb == NULL)) {
  447                         /* reduce ref-count */
  448                         SCTP_INP_WLOCK(inp);
  449                         SCTP_INP_DECR_REF(inp);
  450                         goto cred_can_cont;
  451                 }
  452                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  453                 error = ENOENT;
  454                 goto out;
  455         }
  456         SCTP_TCB_UNLOCK(stcb);
  457         /*
  458          * We use the write lock here, only since in the error leg we need
  459          * it. If we used RLOCK, then we would have to
  460          * wlock/decr/unlock/rlock. Which in theory could create a hole.
  461          * Better to use higher wlock.
  462          */
  463         SCTP_INP_WLOCK(inp);
  464 cred_can_cont:
  465         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
  466         if (error) {
  467                 SCTP_INP_WUNLOCK(inp);
  468                 goto out;
  469         }
  470         cru2x(inp->sctp_socket->so_cred, &xuc);
  471         SCTP_INP_WUNLOCK(inp);
  472         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  473 out:
  474         return (error);
  475 }
  476 
  477 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
  478     0, 0,
  479     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
  480 
  481 
  482 /* This is the same as the sctp_abort() could be made common */
  483 static void
  484 sctp6_abort(struct socket *so)
  485 {
  486         struct sctp_inpcb *inp;
  487         uint32_t flags;
  488 
  489         inp = (struct sctp_inpcb *)so->so_pcb;
  490         if (inp == NULL) {
  491                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  492                 return;
  493         }
  494 sctp_must_try_again:
  495         flags = inp->sctp_flags;
  496 #ifdef SCTP_LOG_CLOSING
  497         sctp_log_closing(inp, NULL, 17);
  498 #endif
  499         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
  500             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
  501 #ifdef SCTP_LOG_CLOSING
  502                 sctp_log_closing(inp, NULL, 16);
  503 #endif
  504                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
  505                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
  506                 SOCK_LOCK(so);
  507                 SCTP_SB_CLEAR(so->so_snd);
  508                 /*
  509                  * same for the rcv ones, they are only here for the
  510                  * accounting/select.
  511                  */
  512                 SCTP_SB_CLEAR(so->so_rcv);
  513                 /* Now null out the reference, we are completely detached. */
  514                 so->so_pcb = NULL;
  515                 SOCK_UNLOCK(so);
  516         } else {
  517                 flags = inp->sctp_flags;
  518                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
  519                         goto sctp_must_try_again;
  520                 }
  521         }
  522         return;
  523 }
  524 
  525 static int
  526 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
  527 {
  528         struct in6pcb *inp6;
  529         int error;
  530         struct sctp_inpcb *inp;
  531         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
  532 
  533         inp = (struct sctp_inpcb *)so->so_pcb;
  534         if (inp != NULL) {
  535                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  536                 return (EINVAL);
  537         }
  538         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  539                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
  540                 if (error)
  541                         return (error);
  542         }
  543         error = sctp_inpcb_alloc(so, vrf_id);
  544         if (error)
  545                 return (error);
  546         inp = (struct sctp_inpcb *)so->so_pcb;
  547         SCTP_INP_WLOCK(inp);
  548         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
  549         inp6 = (struct in6pcb *)inp;
  550 
  551         inp6->inp_vflag |= INP_IPV6;
  552         inp6->in6p_hops = -1;   /* use kernel default */
  553         inp6->in6p_cksum = -1;  /* just to be sure */
  554 #ifdef INET
  555         /*
  556          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
  557          * socket as well, because the socket may be bound to an IPv6
  558          * wildcard address, which may match an IPv4-mapped IPv6 address.
  559          */
  560         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
  561 #endif
  562         /*
  563          * Hmm what about the IPSEC stuff that is missing here but in
  564          * sctp_attach()?
  565          */
  566         SCTP_INP_WUNLOCK(inp);
  567         return (0);
  568 }
  569 
  570 static int
  571 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
  572 {
  573         struct sctp_inpcb *inp;
  574         struct in6pcb *inp6;
  575         int error;
  576 
  577         inp = (struct sctp_inpcb *)so->so_pcb;
  578         if (inp == NULL) {
  579                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  580                 return (EINVAL);
  581         }
  582         if (addr) {
  583                 switch (addr->sa_family) {
  584 #ifdef INET
  585                 case AF_INET:
  586                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
  587                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  588                                 return (EINVAL);
  589                         }
  590                         break;
  591 #endif
  592 #ifdef INET6
  593                 case AF_INET6:
  594                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  595                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  596                                 return (EINVAL);
  597                         }
  598                         break;
  599 #endif
  600                 default:
  601                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  602                         return (EINVAL);
  603                 }
  604         }
  605         inp6 = (struct in6pcb *)inp;
  606         inp6->inp_vflag &= ~INP_IPV4;
  607         inp6->inp_vflag |= INP_IPV6;
  608         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
  609                 switch (addr->sa_family) {
  610 #ifdef INET
  611                 case AF_INET:
  612                         /* binding v4 addr to v6 socket, so reset flags */
  613                         inp6->inp_vflag |= INP_IPV4;
  614                         inp6->inp_vflag &= ~INP_IPV6;
  615                         break;
  616 #endif
  617 #ifdef INET6
  618                 case AF_INET6:
  619                         {
  620                                 struct sockaddr_in6 *sin6_p;
  621 
  622                                 sin6_p = (struct sockaddr_in6 *)addr;
  623 
  624                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
  625                                         inp6->inp_vflag |= INP_IPV4;
  626                                 }
  627 #ifdef INET
  628                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  629                                         struct sockaddr_in sin;
  630 
  631                                         in6_sin6_2_sin(&sin, sin6_p);
  632                                         inp6->inp_vflag |= INP_IPV4;
  633                                         inp6->inp_vflag &= ~INP_IPV6;
  634                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
  635                                         return (error);
  636                                 }
  637 #endif
  638                                 break;
  639                         }
  640 #endif
  641                 default:
  642                         break;
  643                 }
  644         } else if (addr != NULL) {
  645                 struct sockaddr_in6 *sin6_p;
  646 
  647                 /* IPV6_V6ONLY socket */
  648 #ifdef INET
  649                 if (addr->sa_family == AF_INET) {
  650                         /* can't bind v4 addr to v6 only socket! */
  651                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  652                         return (EINVAL);
  653                 }
  654 #endif
  655                 sin6_p = (struct sockaddr_in6 *)addr;
  656 
  657                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  658                         /* can't bind v4-mapped addrs either! */
  659                         /* NOTE: we don't support SIIT */
  660                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  661                         return (EINVAL);
  662                 }
  663         }
  664         error = sctp_inpcb_bind(so, addr, NULL, p);
  665         return (error);
  666 }
  667 
  668 
  669 static void
  670 sctp6_close(struct socket *so)
  671 {
  672         sctp_close(so);
  673 }
  674 
  675 /* This could be made common with sctp_detach() since they are identical */
  676 
  677 static
  678 int
  679 sctp6_disconnect(struct socket *so)
  680 {
  681         return (sctp_disconnect(so));
  682 }
  683 
  684 
  685 int
  686 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  687     struct mbuf *control, struct thread *p);
  688 
  689 
  690 static int
  691 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  692     struct mbuf *control, struct thread *p)
  693 {
  694         struct sctp_inpcb *inp;
  695         struct in6pcb *inp6;
  696 
  697 #ifdef INET
  698         struct sockaddr_in6 *sin6;
  699 
  700 #endif                          /* INET */
  701         /* No SPL needed since sctp_output does this */
  702 
  703         inp = (struct sctp_inpcb *)so->so_pcb;
  704         if (inp == NULL) {
  705                 if (control) {
  706                         SCTP_RELEASE_PKT(control);
  707                         control = NULL;
  708                 }
  709                 SCTP_RELEASE_PKT(m);
  710                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  711                 return (EINVAL);
  712         }
  713         inp6 = (struct in6pcb *)inp;
  714         /*
  715          * For the TCP model we may get a NULL addr, if we are a connected
  716          * socket thats ok.
  717          */
  718         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
  719             (addr == NULL)) {
  720                 goto connected_type;
  721         }
  722         if (addr == NULL) {
  723                 SCTP_RELEASE_PKT(m);
  724                 if (control) {
  725                         SCTP_RELEASE_PKT(control);
  726                         control = NULL;
  727                 }
  728                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
  729                 return (EDESTADDRREQ);
  730         }
  731 #ifdef INET
  732         sin6 = (struct sockaddr_in6 *)addr;
  733         if (SCTP_IPV6_V6ONLY(inp6)) {
  734                 /*
  735                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
  736                  * v4 addr or v4-mapped addr
  737                  */
  738                 if (addr->sa_family == AF_INET) {
  739                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  740                         return (EINVAL);
  741                 }
  742                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  743                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  744                         return (EINVAL);
  745                 }
  746         }
  747         if (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                 int ret;
  784 
  785                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
  786                 inp->pkt = NULL;
  787                 inp->control = NULL;
  788                 return (ret);
  789         } else {
  790                 return (0);
  791         }
  792 }
  793 
  794 static int
  795 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
  796 {
  797         uint32_t vrf_id;
  798         int error = 0;
  799         struct sctp_inpcb *inp;
  800         struct sctp_tcb *stcb;
  801 
  802 #ifdef INET
  803         struct in6pcb *inp6;
  804         struct sockaddr_in6 *sin6;
  805         union sctp_sockstore store;
  806 
  807 #endif
  808 
  809 #ifdef INET
  810         inp6 = (struct in6pcb *)so->so_pcb;
  811 #endif
  812         inp = (struct sctp_inpcb *)so->so_pcb;
  813         if (inp == NULL) {
  814                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  815                 return (ECONNRESET);    /* I made the same as TCP since we are
  816                                          * not setup? */
  817         }
  818         if (addr == NULL) {
  819                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  820                 return (EINVAL);
  821         }
  822         switch (addr->sa_family) {
  823 #ifdef INET
  824         case AF_INET:
  825                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
  826                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  827                         return (EINVAL);
  828                 }
  829                 break;
  830 #endif
  831 #ifdef INET6
  832         case AF_INET6:
  833                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  834                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  835                         return (EINVAL);
  836                 }
  837                 break;
  838 #endif
  839         default:
  840                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  841                 return (EINVAL);
  842         }
  843 
  844         vrf_id = inp->def_vrf_id;
  845         SCTP_ASOC_CREATE_LOCK(inp);
  846         SCTP_INP_RLOCK(inp);
  847         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
  848             SCTP_PCB_FLAGS_UNBOUND) {
  849                 /* Bind a ephemeral port */
  850                 SCTP_INP_RUNLOCK(inp);
  851                 error = sctp6_bind(so, NULL, p);
  852                 if (error) {
  853                         SCTP_ASOC_CREATE_UNLOCK(inp);
  854 
  855                         return (error);
  856                 }
  857                 SCTP_INP_RLOCK(inp);
  858         }
  859         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
  860             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
  861                 /* We are already connected AND the TCP model */
  862                 SCTP_INP_RUNLOCK(inp);
  863                 SCTP_ASOC_CREATE_UNLOCK(inp);
  864                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
  865                 return (EADDRINUSE);
  866         }
  867 #ifdef INET
  868         sin6 = (struct sockaddr_in6 *)addr;
  869         if (SCTP_IPV6_V6ONLY(inp6)) {
  870                 /*
  871                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
  872                  * addr or v4-mapped addr
  873                  */
  874                 if (addr->sa_family == AF_INET) {
  875                         SCTP_INP_RUNLOCK(inp);
  876                         SCTP_ASOC_CREATE_UNLOCK(inp);
  877                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  878                         return (EINVAL);
  879                 }
  880                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  881                         SCTP_INP_RUNLOCK(inp);
  882                         SCTP_ASOC_CREATE_UNLOCK(inp);
  883                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  884                         return (EINVAL);
  885                 }
  886         }
  887         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  888                 /* convert v4-mapped into v4 addr */
  889                 in6_sin6_2_sin(&store.sin, sin6);
  890                 addr = &store.sa;
  891         }
  892 #endif                          /* INET */
  893         /* Now do we connect? */
  894         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
  895                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
  896                 if (stcb) {
  897                         SCTP_TCB_UNLOCK(stcb);
  898                 }
  899                 SCTP_INP_RUNLOCK(inp);
  900         } else {
  901                 SCTP_INP_RUNLOCK(inp);
  902                 SCTP_INP_WLOCK(inp);
  903                 SCTP_INP_INCR_REF(inp);
  904                 SCTP_INP_WUNLOCK(inp);
  905                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
  906                 if (stcb == NULL) {
  907                         SCTP_INP_WLOCK(inp);
  908                         SCTP_INP_DECR_REF(inp);
  909                         SCTP_INP_WUNLOCK(inp);
  910                 }
  911         }
  912 
  913         if (stcb != NULL) {
  914                 /* Already have or am bring up an association */
  915                 SCTP_ASOC_CREATE_UNLOCK(inp);
  916                 SCTP_TCB_UNLOCK(stcb);
  917                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
  918                 return (EALREADY);
  919         }
  920         /* We are GOOD to go */
  921         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
  922             inp->sctp_ep.pre_open_stream_count,
  923             inp->sctp_ep.port, p);
  924         SCTP_ASOC_CREATE_UNLOCK(inp);
  925         if (stcb == NULL) {
  926                 /* Gak! no memory */
  927                 return (error);
  928         }
  929         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
  930                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
  931                 /* Set the connected flag so we can queue data */
  932                 soisconnecting(so);
  933         }
  934         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
  935         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
  936 
  937         /* initialize authentication parameters for the assoc */
  938         sctp_initialize_auth_params(inp, stcb);
  939 
  940         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
  941         SCTP_TCB_UNLOCK(stcb);
  942         return (error);
  943 }
  944 
  945 static int
  946 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
  947 {
  948         struct sockaddr_in6 *sin6;
  949         struct sctp_inpcb *inp;
  950         uint32_t vrf_id;
  951         struct sctp_ifa *sctp_ifa;
  952 
  953         int error;
  954 
  955         /*
  956          * Do the malloc first in case it blocks.
  957          */
  958         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
  959         if (sin6 == NULL)
  960                 return (ENOMEM);
  961         sin6->sin6_family = AF_INET6;
  962         sin6->sin6_len = sizeof(*sin6);
  963 
  964         inp = (struct sctp_inpcb *)so->so_pcb;
  965         if (inp == NULL) {
  966                 SCTP_FREE_SONAME(sin6);
  967                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  968                 return (ECONNRESET);
  969         }
  970         SCTP_INP_RLOCK(inp);
  971         sin6->sin6_port = inp->sctp_lport;
  972         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
  973                 /* For the bound all case you get back 0 */
  974                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
  975                         struct sctp_tcb *stcb;
  976                         struct sockaddr_in6 *sin_a6;
  977                         struct sctp_nets *net;
  978                         int fnd;
  979 
  980                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
  981                         if (stcb == NULL) {
  982                                 SCTP_INP_RUNLOCK(inp);
  983                                 SCTP_FREE_SONAME(sin6);
  984                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  985                                 return (ENOENT);
  986                         }
  987                         fnd = 0;
  988                         sin_a6 = NULL;
  989                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  990                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
  991                                 if (sin_a6 == NULL)
  992                                         /* this will make coverity happy */
  993                                         continue;
  994 
  995                                 if (sin_a6->sin6_family == AF_INET6) {
  996                                         fnd = 1;
  997                                         break;
  998                                 }
  999                         }
 1000                         if ((!fnd) || (sin_a6 == NULL)) {
 1001                                 /* punt */
 1002                                 SCTP_INP_RUNLOCK(inp);
 1003                                 SCTP_FREE_SONAME(sin6);
 1004                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1005                                 return (ENOENT);
 1006                         }
 1007                         vrf_id = inp->def_vrf_id;
 1008                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
 1009                         if (sctp_ifa) {
 1010                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
 1011                         }
 1012                 } else {
 1013                         /* For the bound all case you get back 0 */
 1014                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
 1015                 }
 1016         } else {
 1017                 /* Take the first IPv6 address in the list */
 1018                 struct sctp_laddr *laddr;
 1019                 int fnd = 0;
 1020 
 1021                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 1022                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
 1023                                 struct sockaddr_in6 *sin_a;
 1024 
 1025                                 sin_a = &laddr->ifa->address.sin6;
 1026                                 sin6->sin6_addr = sin_a->sin6_addr;
 1027                                 fnd = 1;
 1028                                 break;
 1029                         }
 1030                 }
 1031                 if (!fnd) {
 1032                         SCTP_FREE_SONAME(sin6);
 1033                         SCTP_INP_RUNLOCK(inp);
 1034                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1035                         return (ENOENT);
 1036                 }
 1037         }
 1038         SCTP_INP_RUNLOCK(inp);
 1039         /* Scoping things for v6 */
 1040         if ((error = sa6_recoverscope(sin6)) != 0) {
 1041                 SCTP_FREE_SONAME(sin6);
 1042                 return (error);
 1043         }
 1044         (*addr) = (struct sockaddr *)sin6;
 1045         return (0);
 1046 }
 1047 
 1048 static int
 1049 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
 1050 {
 1051         struct sockaddr_in6 *sin6;
 1052         int fnd;
 1053         struct sockaddr_in6 *sin_a6;
 1054         struct sctp_inpcb *inp;
 1055         struct sctp_tcb *stcb;
 1056         struct sctp_nets *net;
 1057         int error;
 1058 
 1059         /* Do the malloc first in case it blocks. */
 1060         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1061         if (sin6 == NULL)
 1062                 return (ENOMEM);
 1063         sin6->sin6_family = AF_INET6;
 1064         sin6->sin6_len = sizeof(*sin6);
 1065 
 1066         inp = (struct sctp_inpcb *)so->so_pcb;
 1067         if ((inp == NULL) ||
 1068             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 1069                 /* UDP type and listeners will drop out here */
 1070                 SCTP_FREE_SONAME(sin6);
 1071                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
 1072                 return (ENOTCONN);
 1073         }
 1074         SCTP_INP_RLOCK(inp);
 1075         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1076         if (stcb) {
 1077                 SCTP_TCB_LOCK(stcb);
 1078         }
 1079         SCTP_INP_RUNLOCK(inp);
 1080         if (stcb == NULL) {
 1081                 SCTP_FREE_SONAME(sin6);
 1082                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 1083                 return (ECONNRESET);
 1084         }
 1085         fnd = 0;
 1086         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 1087                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1088                 if (sin_a6->sin6_family == AF_INET6) {
 1089                         fnd = 1;
 1090                         sin6->sin6_port = stcb->rport;
 1091                         sin6->sin6_addr = sin_a6->sin6_addr;
 1092                         break;
 1093                 }
 1094         }
 1095         SCTP_TCB_UNLOCK(stcb);
 1096         if (!fnd) {
 1097                 /* No IPv4 address */
 1098                 SCTP_FREE_SONAME(sin6);
 1099                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1100                 return (ENOENT);
 1101         }
 1102         if ((error = sa6_recoverscope(sin6)) != 0) {
 1103                 SCTP_FREE_SONAME(sin6);
 1104                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
 1105                 return (error);
 1106         }
 1107         *addr = (struct sockaddr *)sin6;
 1108         return (0);
 1109 }
 1110 
 1111 static int
 1112 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
 1113 {
 1114         struct in6pcb *inp6 = sotoin6pcb(so);
 1115         int error;
 1116 
 1117         if (inp6 == NULL) {
 1118                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1119                 return (EINVAL);
 1120         }
 1121         /* allow v6 addresses precedence */
 1122         error = sctp6_getaddr(so, nam);
 1123 #ifdef INET
 1124         if (error) {
 1125                 struct sockaddr_in6 *sin6;
 1126 
 1127                 /* try v4 next if v6 failed */
 1128                 error = sctp_ingetaddr(so, nam);
 1129                 if (error) {
 1130                         return (error);
 1131                 }
 1132                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1133                 if (sin6 == NULL) {
 1134                         SCTP_FREE_SONAME(*nam);
 1135                         return (ENOMEM);
 1136                 }
 1137                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
 1138                 SCTP_FREE_SONAME(*nam);
 1139                 *nam = (struct sockaddr *)sin6;
 1140         }
 1141 #endif
 1142         return (error);
 1143 }
 1144 
 1145 
 1146 static int
 1147 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
 1148 {
 1149         struct in6pcb *inp6 = sotoin6pcb(so);
 1150         int error;
 1151 
 1152         if (inp6 == NULL) {
 1153                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1154                 return (EINVAL);
 1155         }
 1156         /* allow v6 addresses precedence */
 1157         error = sctp6_peeraddr(so, nam);
 1158 #ifdef INET
 1159         if (error) {
 1160                 struct sockaddr_in6 *sin6;
 1161 
 1162                 /* try v4 next if v6 failed */
 1163                 error = sctp_peeraddr(so, nam);
 1164                 if (error) {
 1165                         return (error);
 1166                 }
 1167                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1168                 if (sin6 == NULL) {
 1169                         SCTP_FREE_SONAME(*nam);
 1170                         return (ENOMEM);
 1171                 }
 1172                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
 1173                 SCTP_FREE_SONAME(*nam);
 1174                 *nam = (struct sockaddr *)sin6;
 1175         }
 1176 #endif
 1177         return (error);
 1178 }
 1179 
 1180 struct pr_usrreqs sctp6_usrreqs = {
 1181         .pru_abort = sctp6_abort,
 1182         .pru_accept = sctp_accept,
 1183         .pru_attach = sctp6_attach,
 1184         .pru_bind = sctp6_bind,
 1185         .pru_connect = sctp6_connect,
 1186         .pru_control = in6_control,
 1187         .pru_close = sctp6_close,
 1188         .pru_detach = sctp6_close,
 1189         .pru_sopoll = sopoll_generic,
 1190         .pru_flush = sctp_flush,
 1191         .pru_disconnect = sctp6_disconnect,
 1192         .pru_listen = sctp_listen,
 1193         .pru_peeraddr = sctp6_getpeeraddr,
 1194         .pru_send = sctp6_send,
 1195         .pru_shutdown = sctp_shutdown,
 1196         .pru_sockaddr = sctp6_in6getaddr,
 1197         .pru_sosend = sctp_sosend,
 1198         .pru_soreceive = sctp_soreceive
 1199 };
 1200 
 1201 #endif

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