The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_bsd_addr.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("$FreeBSD$");
   35 
   36 #include <netinet/sctp_os.h>
   37 #include <netinet/sctp_var.h>
   38 #include <netinet/sctp_pcb.h>
   39 #include <netinet/sctp_header.h>
   40 #include <netinet/sctputil.h>
   41 #include <netinet/sctp_output.h>
   42 #include <netinet/sctp_bsd_addr.h>
   43 #include <netinet/sctp_uio.h>
   44 #include <netinet/sctputil.h>
   45 #include <netinet/sctp_timer.h>
   46 #include <netinet/sctp_asconf.h>
   47 #include <netinet/sctp_sysctl.h>
   48 #include <netinet/sctp_indata.h>
   49 #include <sys/unistd.h>
   50 
   51 /* Declare all of our malloc named types */
   52 MALLOC_DEFINE(SCTP_M_MAP, "sctp_map", "sctp asoc map descriptor");
   53 MALLOC_DEFINE(SCTP_M_STRMI, "sctp_stri", "sctp stream in array");
   54 MALLOC_DEFINE(SCTP_M_STRMO, "sctp_stro", "sctp stream out array");
   55 MALLOC_DEFINE(SCTP_M_ASC_ADDR, "sctp_aadr", "sctp asconf address");
   56 MALLOC_DEFINE(SCTP_M_ASC_IT, "sctp_a_it", "sctp asconf iterator");
   57 MALLOC_DEFINE(SCTP_M_AUTH_CL, "sctp_atcl", "sctp auth chunklist");
   58 MALLOC_DEFINE(SCTP_M_AUTH_KY, "sctp_atky", "sctp auth key");
   59 MALLOC_DEFINE(SCTP_M_AUTH_HL, "sctp_athm", "sctp auth hmac list");
   60 MALLOC_DEFINE(SCTP_M_AUTH_IF, "sctp_athi", "sctp auth info");
   61 MALLOC_DEFINE(SCTP_M_STRESET, "sctp_stre", "sctp stream reset");
   62 MALLOC_DEFINE(SCTP_M_CMSG, "sctp_cmsg", "sctp CMSG buffer");
   63 MALLOC_DEFINE(SCTP_M_COPYAL, "sctp_cpal", "sctp copy all");
   64 MALLOC_DEFINE(SCTP_M_VRF, "sctp_vrf", "sctp vrf struct");
   65 MALLOC_DEFINE(SCTP_M_IFA, "sctp_ifa", "sctp ifa struct");
   66 MALLOC_DEFINE(SCTP_M_IFN, "sctp_ifn", "sctp ifn struct");
   67 MALLOC_DEFINE(SCTP_M_TIMW, "sctp_timw", "sctp time block");
   68 MALLOC_DEFINE(SCTP_M_MVRF, "sctp_mvrf", "sctp mvrf pcb list");
   69 MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control");
   70 MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option");
   71 MALLOC_DEFINE(SCTP_M_MCORE, "sctp_mcore", "sctp mcore queue");
   72 
   73 /* Global NON-VNET structure that controls the iterator */
   74 struct iterator_control sctp_it_ctl;
   75 
   76 
   77 void
   78 sctp_wakeup_iterator(void)
   79 {
   80         wakeup(&sctp_it_ctl.iterator_running);
   81 }
   82 
   83 static void
   84 sctp_iterator_thread(void *v SCTP_UNUSED)
   85 {
   86         SCTP_IPI_ITERATOR_WQ_LOCK();
   87         /* In FreeBSD this thread never terminates. */
   88         for (;;) {
   89                 msleep(&sctp_it_ctl.iterator_running,
   90                     &sctp_it_ctl.ipi_iterator_wq_mtx,
   91                     0, "waiting_for_work", 0);
   92                 sctp_iterator_worker();
   93         }
   94 }
   95 
   96 void
   97 sctp_startup_iterator(void)
   98 {
   99         static int called = 0;
  100         int ret;
  101 
  102         if (called) {
  103                 /* You only get one */
  104                 return;
  105         }
  106         /* init the iterator head */
  107         called = 1;
  108         sctp_it_ctl.iterator_running = 0;
  109         sctp_it_ctl.iterator_flags = 0;
  110         sctp_it_ctl.cur_it = NULL;
  111         SCTP_ITERATOR_LOCK_INIT();
  112         SCTP_IPI_ITERATOR_WQ_INIT();
  113         TAILQ_INIT(&sctp_it_ctl.iteratorhead);
  114         ret = kproc_create(sctp_iterator_thread,
  115             (void *)NULL,
  116             &sctp_it_ctl.thread_proc,
  117             RFPROC,
  118             SCTP_KTHREAD_PAGES,
  119             SCTP_KTRHEAD_NAME);
  120 }
  121 
  122 #ifdef INET6
  123 
  124 void
  125 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)
  126 {
  127         struct in6_ifaddr *ifa6;
  128 
  129         ifa6 = (struct in6_ifaddr *)ifa->ifa;
  130         ifa->flags = ifa6->ia6_flags;
  131         if (!MODULE_GLOBAL(ip6_use_deprecated)) {
  132                 if (ifa->flags &
  133                     IN6_IFF_DEPRECATED) {
  134                         ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
  135                 } else {
  136                         ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  137                 }
  138         } else {
  139                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  140         }
  141         if (ifa->flags &
  142             (IN6_IFF_DETACHED |
  143             IN6_IFF_ANYCAST |
  144             IN6_IFF_NOTREADY)) {
  145                 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
  146         } else {
  147                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  148         }
  149 }
  150 
  151 #endif                          /* INET6 */
  152 
  153 
  154 static uint32_t
  155 sctp_is_desired_interface_type(struct ifnet *ifn)
  156 {
  157         int result;
  158 
  159         /* check the interface type to see if it's one we care about */
  160         switch (ifn->if_type) {
  161         case IFT_ETHER:
  162         case IFT_ISO88023:
  163         case IFT_ISO88024:
  164         case IFT_ISO88025:
  165         case IFT_ISO88026:
  166         case IFT_STARLAN:
  167         case IFT_P10:
  168         case IFT_P80:
  169         case IFT_HY:
  170         case IFT_FDDI:
  171         case IFT_XETHER:
  172         case IFT_ISDNBASIC:
  173         case IFT_ISDNPRIMARY:
  174         case IFT_PTPSERIAL:
  175         case IFT_OTHER:
  176         case IFT_PPP:
  177         case IFT_LOOP:
  178         case IFT_SLIP:
  179         case IFT_GIF:
  180         case IFT_L2VLAN:
  181         case IFT_STF:
  182         case IFT_IP:
  183         case IFT_IPOVERCDLC:
  184         case IFT_IPOVERCLAW:
  185         case IFT_PROPVIRTUAL:   /* NetGraph Virtual too */
  186         case IFT_VIRTUALIPADDRESS:
  187                 result = 1;
  188                 break;
  189         default:
  190                 result = 0;
  191         }
  192 
  193         return (result);
  194 }
  195 
  196 
  197 
  198 
  199 static void
  200 sctp_init_ifns_for_vrf(int vrfid)
  201 {
  202         /*
  203          * Here we must apply ANY locks needed by the IFN we access and also
  204          * make sure we lock any IFA that exists as we float through the
  205          * list of IFA's
  206          */
  207         struct ifnet *ifn;
  208         struct ifaddr *ifa;
  209         struct sctp_ifa *sctp_ifa;
  210         uint32_t ifa_flags;
  211 
  212 #ifdef INET6
  213         struct in6_ifaddr *ifa6;
  214 
  215 #endif
  216 
  217         IFNET_RLOCK();
  218         TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {
  219                 if (sctp_is_desired_interface_type(ifn) == 0) {
  220                         /* non desired type */
  221                         continue;
  222                 }
  223                 IF_ADDR_RLOCK(ifn);
  224                 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
  225                         if (ifa->ifa_addr == NULL) {
  226                                 continue;
  227                         }
  228                         switch (ifa->ifa_addr->sa_family) {
  229 #ifdef INET
  230                         case AF_INET:
  231                                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
  232                                         continue;
  233                                 }
  234                                 break;
  235 #endif
  236 #ifdef INET6
  237                         case AF_INET6:
  238                                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
  239                                         /* skip unspecifed addresses */
  240                                         continue;
  241                                 }
  242                                 break;
  243 #endif
  244                         default:
  245                                 continue;
  246                         }
  247                         switch (ifa->ifa_addr->sa_family) {
  248 #ifdef INET
  249                         case AF_INET:
  250                                 ifa_flags = 0;
  251                                 break;
  252 #endif
  253 #ifdef INET6
  254                         case AF_INET6:
  255                                 ifa6 = (struct in6_ifaddr *)ifa;
  256                                 ifa_flags = ifa6->ia6_flags;
  257                                 break;
  258 #endif
  259                         default:
  260                                 ifa_flags = 0;
  261                                 break;
  262                         }
  263                         sctp_ifa = sctp_add_addr_to_vrf(vrfid,
  264                             (void *)ifn,
  265                             ifn->if_index,
  266                             ifn->if_type,
  267                             ifn->if_xname,
  268                             (void *)ifa,
  269                             ifa->ifa_addr,
  270                             ifa_flags,
  271                             0);
  272                         if (sctp_ifa) {
  273                                 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
  274                         }
  275                 }
  276                 IF_ADDR_RUNLOCK(ifn);
  277         }
  278         IFNET_RUNLOCK();
  279 }
  280 
  281 void
  282 sctp_init_vrf_list(int vrfid)
  283 {
  284         if (vrfid > SCTP_MAX_VRF_ID)
  285                 /* can't do that */
  286                 return;
  287 
  288         /* Don't care about return here */
  289         (void)sctp_allocate_vrf(vrfid);
  290 
  291         /*
  292          * Now we need to build all the ifn's for this vrf and there
  293          * addresses
  294          */
  295         sctp_init_ifns_for_vrf(vrfid);
  296 }
  297 
  298 void
  299 sctp_addr_change(struct ifaddr *ifa, int cmd)
  300 {
  301         uint32_t ifa_flags = 0;
  302 
  303         /*
  304          * BSD only has one VRF, if this changes we will need to hook in the
  305          * right things here to get the id to pass to the address managment
  306          * routine.
  307          */
  308         if (SCTP_BASE_VAR(first_time) == 0) {
  309                 /* Special test to see if my ::1 will showup with this */
  310                 SCTP_BASE_VAR(first_time) = 1;
  311                 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
  312         }
  313         if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
  314                 /* don't know what to do with this */
  315                 return;
  316         }
  317         if (ifa->ifa_addr == NULL) {
  318                 return;
  319         }
  320         if (sctp_is_desired_interface_type(ifa->ifa_ifp) == 0) {
  321                 /* non desired type */
  322                 return;
  323         }
  324         switch (ifa->ifa_addr->sa_family) {
  325 #ifdef INET
  326         case AF_INET:
  327                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
  328                         return;
  329                 }
  330                 break;
  331 #endif
  332 #ifdef INET6
  333         case AF_INET6:
  334                 ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags;
  335                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
  336                         /* skip unspecifed addresses */
  337                         return;
  338                 }
  339                 break;
  340 #endif
  341         default:
  342                 /* non inet/inet6 skip */
  343                 return;
  344         }
  345         if (cmd == RTM_ADD) {
  346                 (void)sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
  347                     ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type, ifa->ifa_ifp->if_xname,
  348                     (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
  349         } else {
  350 
  351                 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr,
  352                     ifa->ifa_ifp->if_index,
  353                     ifa->ifa_ifp->if_xname);
  354 
  355                 /*
  356                  * We don't bump refcount here so when it completes the
  357                  * final delete will happen.
  358                  */
  359         }
  360 }
  361 
  362 void
  363      sctp_add_or_del_interfaces(int (*pred) (struct ifnet *), int add){
  364         struct ifnet *ifn;
  365         struct ifaddr *ifa;
  366 
  367         IFNET_RLOCK();
  368         TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {
  369                 if (!(*pred) (ifn)) {
  370                         continue;
  371                 }
  372                 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
  373                         sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE);
  374                 }
  375         }
  376         IFNET_RUNLOCK();
  377 }
  378 
  379 struct mbuf *
  380 sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
  381     int how, int allonebuf, int type)
  382 {
  383         struct mbuf *m = NULL;
  384 
  385         m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
  386         if (m == NULL) {
  387                 /* bad, no memory */
  388                 return (m);
  389         }
  390         if (allonebuf) {
  391                 int siz;
  392 
  393                 if (SCTP_BUF_IS_EXTENDED(m)) {
  394                         siz = SCTP_BUF_EXTEND_SIZE(m);
  395                 } else {
  396                         if (want_header)
  397                                 siz = MHLEN;
  398                         else
  399                                 siz = MLEN;
  400                 }
  401                 if (siz < space_needed) {
  402                         m_freem(m);
  403                         return (NULL);
  404                 }
  405         }
  406         if (SCTP_BUF_NEXT(m)) {
  407                 sctp_m_freem(SCTP_BUF_NEXT(m));
  408                 SCTP_BUF_NEXT(m) = NULL;
  409         }
  410 #ifdef SCTP_MBUF_LOGGING
  411         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  412                 if (SCTP_BUF_IS_EXTENDED(m)) {
  413                         sctp_log_mb(m, SCTP_MBUF_IALLOC);
  414                 }
  415         }
  416 #endif
  417         return (m);
  418 }
  419 
  420 
  421 #ifdef SCTP_PACKET_LOGGING
  422 void
  423 sctp_packet_log(struct mbuf *m)
  424 {
  425         int *lenat, thisone;
  426         void *copyto;
  427         uint32_t *tick_tock;
  428         int length;
  429         int total_len;
  430         int grabbed_lock = 0;
  431         int value, newval, thisend, thisbegin;
  432 
  433         /*
  434          * Buffer layout. -sizeof this entry (total_len) -previous end
  435          * (value) -ticks of log      (ticks) o -ip packet o -as logged -
  436          * where this started (thisbegin) x <--end points here
  437          */
  438         length = SCTP_HEADER_LEN(m);
  439         total_len = SCTP_SIZE32((length + (4 * sizeof(int))));
  440         /* Log a packet to the buffer. */
  441         if (total_len > SCTP_PACKET_LOG_SIZE) {
  442                 /* Can't log this packet I have not a buffer big enough */
  443                 return;
  444         }
  445         if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {
  446                 return;
  447         }
  448         atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1);
  449 try_again:
  450         if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  451                 SCTP_IP_PKTLOG_LOCK();
  452                 grabbed_lock = 1;
  453 again_locked:
  454                 value = SCTP_BASE_VAR(packet_log_end);
  455                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
  456                 if (newval >= SCTP_PACKET_LOG_SIZE) {
  457                         /* we wrapped */
  458                         thisbegin = 0;
  459                         thisend = total_len;
  460                 } else {
  461                         thisbegin = SCTP_BASE_VAR(packet_log_end);
  462                         thisend = newval;
  463                 }
  464                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
  465                         goto again_locked;
  466                 }
  467         } else {
  468                 value = SCTP_BASE_VAR(packet_log_end);
  469                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
  470                 if (newval >= SCTP_PACKET_LOG_SIZE) {
  471                         /* we wrapped */
  472                         thisbegin = 0;
  473                         thisend = total_len;
  474                 } else {
  475                         thisbegin = SCTP_BASE_VAR(packet_log_end);
  476                         thisend = newval;
  477                 }
  478                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
  479                         goto try_again;
  480                 }
  481         }
  482         /* Sanity check */
  483         if (thisend >= SCTP_PACKET_LOG_SIZE) {
  484                 SCTP_PRINTF("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",
  485                     thisbegin,
  486                     thisend,
  487                     SCTP_BASE_VAR(packet_log_writers),
  488                     grabbed_lock,
  489                     SCTP_BASE_VAR(packet_log_end));
  490                 SCTP_BASE_VAR(packet_log_end) = 0;
  491                 goto no_log;
  492 
  493         }
  494         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin];
  495         *lenat = total_len;
  496         lenat++;
  497         *lenat = value;
  498         lenat++;
  499         tick_tock = (uint32_t *) lenat;
  500         lenat++;
  501         *tick_tock = sctp_get_tick_count();
  502         copyto = (void *)lenat;
  503         thisone = thisend - sizeof(int);
  504         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone];
  505         *lenat = thisbegin;
  506         if (grabbed_lock) {
  507                 SCTP_IP_PKTLOG_UNLOCK();
  508                 grabbed_lock = 0;
  509         }
  510         m_copydata(m, 0, length, (caddr_t)copyto);
  511 no_log:
  512         if (grabbed_lock) {
  513                 SCTP_IP_PKTLOG_UNLOCK();
  514         }
  515         atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1);
  516 }
  517 
  518 
  519 int
  520 sctp_copy_out_packet_log(uint8_t * target, int length)
  521 {
  522         /*
  523          * We wind through the packet log starting at start copying up to
  524          * length bytes out. We return the number of bytes copied.
  525          */
  526         int tocopy, this_copy;
  527         int *lenat;
  528         int did_delay = 0;
  529 
  530         tocopy = length;
  531         if (length < (int)(2 * sizeof(int))) {
  532                 /* not enough room */
  533                 return (0);
  534         }
  535         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  536                 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK);
  537 again:
  538                 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {
  539                         /*
  540                          * we delay here for just a moment hoping the
  541                          * writer(s) that were present when we entered will
  542                          * have left and we only have locking ones that will
  543                          * contend with us for the lock. This does not
  544                          * assure 100% access, but its good enough for a
  545                          * logging facility like this.
  546                          */
  547                         did_delay = 1;
  548                         DELAY(10);
  549                         goto again;
  550                 }
  551         }
  552         SCTP_IP_PKTLOG_LOCK();
  553         lenat = (int *)target;
  554         *lenat = SCTP_BASE_VAR(packet_log_end);
  555         lenat++;
  556         this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);
  557         memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy);
  558         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  559                 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers),
  560                     SCTP_PKTLOG_WRITERS_NEED_LOCK);
  561         }
  562         SCTP_IP_PKTLOG_UNLOCK();
  563         return (this_copy + sizeof(int));
  564 }
  565 
  566 #endif

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