The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_bsd_addr.c

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions are met:
    6  *
    7  * a) Redistributions of source code must retain the above copyright notice,
    8  *   this list of conditions and the following disclaimer.
    9  *
   10  * b) Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in
   12  *   the documentation and/or other materials provided with the distribution.
   13  *
   14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   15  *    contributors may be used to endorse or promote products derived
   16  *    from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   28  * THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 /* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $  */
   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 
   53 /* Note to Michael/Peter for mac-os,
   54  * I think mac has this too since I
   55  * do see the M_PCB type, so I
   56  * will also put in the mac file the
   57  * MALLOC_DECLARE. If this does not
   58  * work for mac uncomment the defines for
   59  * the strings that we use in Panda, I put
   60  * them in comments in the mac-os file.
   61  */
   62 MALLOC_DEFINE(SCTP_M_MAP, "sctp_map", "sctp asoc map descriptor");
   63 MALLOC_DEFINE(SCTP_M_STRMI, "sctp_stri", "sctp stream in array");
   64 MALLOC_DEFINE(SCTP_M_STRMO, "sctp_stro", "sctp stream out array");
   65 MALLOC_DEFINE(SCTP_M_ASC_ADDR, "sctp_aadr", "sctp asconf address");
   66 MALLOC_DEFINE(SCTP_M_ASC_IT, "sctp_a_it", "sctp asconf iterator");
   67 MALLOC_DEFINE(SCTP_M_AUTH_CL, "sctp_atcl", "sctp auth chunklist");
   68 MALLOC_DEFINE(SCTP_M_AUTH_KY, "sctp_atky", "sctp auth key");
   69 MALLOC_DEFINE(SCTP_M_AUTH_HL, "sctp_athm", "sctp auth hmac list");
   70 MALLOC_DEFINE(SCTP_M_AUTH_IF, "sctp_athi", "sctp auth info");
   71 MALLOC_DEFINE(SCTP_M_STRESET, "sctp_stre", "sctp stream reset");
   72 MALLOC_DEFINE(SCTP_M_CMSG, "sctp_cmsg", "sctp CMSG buffer");
   73 MALLOC_DEFINE(SCTP_M_COPYAL, "sctp_cpal", "sctp copy all");
   74 MALLOC_DEFINE(SCTP_M_VRF, "sctp_vrf", "sctp vrf struct");
   75 MALLOC_DEFINE(SCTP_M_IFA, "sctp_ifa", "sctp ifa struct");
   76 MALLOC_DEFINE(SCTP_M_IFN, "sctp_ifn", "sctp ifn struct");
   77 MALLOC_DEFINE(SCTP_M_TIMW, "sctp_timw", "sctp time block");
   78 MALLOC_DEFINE(SCTP_M_MVRF, "sctp_mvrf", "sctp mvrf pcb list");
   79 MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control");
   80 MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option");
   81 
   82 #if defined(SCTP_USE_THREAD_BASED_ITERATOR)
   83 void
   84 sctp_wakeup_iterator(void)
   85 {
   86         wakeup(&SCTP_BASE_INFO(iterator_running));
   87 }
   88 
   89 static void
   90 sctp_iterator_thread(void *v)
   91 {
   92         SCTP_IPI_ITERATOR_WQ_LOCK();
   93         SCTP_BASE_INFO(iterator_running) = 0;
   94         while (1) {
   95                 msleep(&SCTP_BASE_INFO(iterator_running),
   96                     &SCTP_BASE_INFO(ipi_iterator_wq_mtx),
   97                     0, "waiting_for_work", 0);
   98                 if (SCTP_BASE_INFO(threads_must_exit)) {
   99                         kthread_exit(0);
  100                 }
  101                 sctp_iterator_worker();
  102         }
  103 }
  104 
  105 void
  106 sctp_startup_iterator(void)
  107 {
  108         int ret;
  109 
  110         ret = kthread_create(sctp_iterator_thread,
  111             (void *)NULL,
  112             &SCTP_BASE_INFO(thread_proc),
  113             RFPROC,
  114             SCTP_KTHREAD_PAGES,
  115             SCTP_KTRHEAD_NAME);
  116 }
  117 
  118 #endif
  119 
  120 #ifdef INET6
  121 
  122 void
  123 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)
  124 {
  125         struct in6_ifaddr *ifa6;
  126 
  127         ifa6 = (struct in6_ifaddr *)ifa->ifa;
  128         ifa->flags = ifa6->ia6_flags;
  129         if (!MODULE_GLOBAL(MOD_INET6, ip6_use_deprecated)) {
  130                 if (ifa->flags &
  131                     IN6_IFF_DEPRECATED) {
  132                         ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
  133                 } else {
  134                         ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  135                 }
  136         } else {
  137                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  138         }
  139         if (ifa->flags &
  140             (IN6_IFF_DETACHED |
  141             IN6_IFF_ANYCAST |
  142             IN6_IFF_NOTREADY)) {
  143                 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
  144         } else {
  145                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  146         }
  147 }
  148 
  149 #endif                          /* INET6 */
  150 
  151 
  152 static uint32_t
  153 sctp_is_desired_interface_type(struct ifaddr *ifa)
  154 {
  155         int result;
  156 
  157         /* check the interface type to see if it's one we care about */
  158         switch (ifa->ifa_ifp->if_type) {
  159         case IFT_ETHER:
  160         case IFT_ISO88023:
  161         case IFT_ISO88024:
  162         case IFT_ISO88025:
  163         case IFT_ISO88026:
  164         case IFT_STARLAN:
  165         case IFT_P10:
  166         case IFT_P80:
  167         case IFT_HY:
  168         case IFT_FDDI:
  169         case IFT_XETHER:
  170         case IFT_ISDNBASIC:
  171         case IFT_ISDNPRIMARY:
  172         case IFT_PTPSERIAL:
  173         case IFT_OTHER:
  174         case IFT_PPP:
  175         case IFT_LOOP:
  176         case IFT_SLIP:
  177         case IFT_GIF:
  178         case IFT_IP:
  179         case IFT_IPOVERCDLC:
  180         case IFT_IPOVERCLAW:
  181         case IFT_VIRTUALIPADDRESS:
  182                 result = 1;
  183                 break;
  184         default:
  185                 result = 0;
  186         }
  187 
  188         return (result);
  189 }
  190 
  191 
  192 static void
  193 sctp_init_ifns_for_vrf(int vrfid)
  194 {
  195 
  196 
  197         /*
  198          * Here we must apply ANY locks needed by the IFN we access and also
  199          * make sure we lock any IFA that exists as we float through the
  200          * list of IFA's
  201          */
  202         struct ifnet *ifn;
  203         struct ifaddr *ifa;
  204         struct in6_ifaddr *ifa6;
  205         struct sctp_ifa *sctp_ifa;
  206         uint32_t ifa_flags;
  207 
  208         TAILQ_FOREACH(ifn, &MODULE_GLOBAL(MOD_NET, ifnet), if_list) {
  209                 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
  210 
  211                         if (ifa->ifa_addr == NULL) {
  212                                 continue;
  213                         }
  214                         if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) {
  215                                 /* non inet/inet6 skip */
  216                                 continue;
  217                         }
  218                         if (ifa->ifa_addr->sa_family == AF_INET6) {
  219                                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
  220                                         /* skip unspecifed addresses */
  221                                         continue;
  222                                 }
  223                         } else {
  224                                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
  225                                         continue;
  226                                 }
  227                         }
  228                         if (sctp_is_desired_interface_type(ifa) == 0) {
  229                                 /* non desired type */
  230                                 continue;
  231                         }
  232                         if (ifa->ifa_addr->sa_family == AF_INET6) {
  233                                 ifa6 = (struct in6_ifaddr *)ifa;
  234                                 ifa_flags = ifa6->ia6_flags;
  235                         } else {
  236                                 ifa_flags = 0;
  237                         }
  238                         sctp_ifa = sctp_add_addr_to_vrf(vrfid,
  239                             (void *)ifn,
  240                             ifn->if_index,
  241                             ifn->if_type,
  242                             ifn->if_xname,
  243                             (void *)ifa,
  244                             ifa->ifa_addr,
  245                             ifa_flags,
  246                             0);
  247                         if (sctp_ifa) {
  248                                 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
  249                         }
  250                 }
  251         }
  252 }
  253 
  254 
  255 void
  256 sctp_init_vrf_list(int vrfid)
  257 {
  258         if (vrfid > SCTP_MAX_VRF_ID)
  259                 /* can't do that */
  260                 return;
  261 
  262         /* Don't care about return here */
  263         (void)sctp_allocate_vrf(vrfid);
  264 
  265         /*
  266          * Now we need to build all the ifn's for this vrf and there
  267          * addresses
  268          */
  269         sctp_init_ifns_for_vrf(vrfid);
  270 }
  271 
  272 void
  273 sctp_addr_change(struct ifaddr *ifa, int cmd)
  274 {
  275         struct sctp_ifa *ifap = NULL;
  276         uint32_t ifa_flags = 0;
  277 
  278         /*
  279          * BSD only has one VRF, if this changes we will need to hook in the
  280          * right things here to get the id to pass to the address managment
  281          * routine.
  282          */
  283         if (SCTP_BASE_VAR(first_time) == 0) {
  284                 /* Special test to see if my ::1 will showup with this */
  285                 SCTP_BASE_VAR(first_time) = 1;
  286                 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
  287         }
  288         if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
  289                 /* don't know what to do with this */
  290                 return;
  291         }
  292         if (ifa->ifa_addr == NULL) {
  293                 return;
  294         }
  295         if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) {
  296                 /* non inet/inet6 skip */
  297                 return;
  298         }
  299         if (ifa->ifa_addr->sa_family == AF_INET6) {
  300                 ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags;
  301                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
  302                         /* skip unspecifed addresses */
  303                         return;
  304                 }
  305         } else {
  306                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
  307                         return;
  308                 }
  309         }
  310 
  311         if (sctp_is_desired_interface_type(ifa) == 0) {
  312                 /* non desired type */
  313                 return;
  314         }
  315         if (cmd == RTM_ADD) {
  316                 ifap = sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
  317                     ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type,
  318                     ifa->ifa_ifp->if_xname,
  319                     (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
  320         } else {
  321 
  322                 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr,
  323                     ifa->ifa_ifp->if_index,
  324                     ifa->ifa_ifp->if_xname
  325                     );
  326                 /*
  327                  * We don't bump refcount here so when it completes the
  328                  * final delete will happen.
  329                  */
  330         }
  331 }
  332 
  333 void
  334      sctp_add_or_del_interfaces(int (*pred) (struct ifnet *), int add){
  335         struct ifnet *ifn;
  336         struct ifaddr *ifa;
  337 
  338         TAILQ_FOREACH(ifn, &MODULE_GLOBAL(MOD_NET, ifnet), if_list) {
  339                 if (!(*pred) (ifn)) {
  340                         continue;
  341                 }
  342                 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
  343                         sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE);
  344                 }
  345         }
  346 }
  347 
  348 struct mbuf *
  349 sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
  350     int how, int allonebuf, int type)
  351 {
  352         struct mbuf *m = NULL;
  353 
  354         m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
  355         if (m == NULL) {
  356                 /* bad, no memory */
  357                 return (m);
  358         }
  359         if (allonebuf) {
  360                 int siz;
  361 
  362                 if (SCTP_BUF_IS_EXTENDED(m)) {
  363                         siz = SCTP_BUF_EXTEND_SIZE(m);
  364                 } else {
  365                         if (want_header)
  366                                 siz = MHLEN;
  367                         else
  368                                 siz = MLEN;
  369                 }
  370                 if (siz < space_needed) {
  371                         m_freem(m);
  372                         return (NULL);
  373                 }
  374         }
  375         if (SCTP_BUF_NEXT(m)) {
  376                 sctp_m_freem(SCTP_BUF_NEXT(m));
  377                 SCTP_BUF_NEXT(m) = NULL;
  378         }
  379 #ifdef SCTP_MBUF_LOGGING
  380         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  381                 if (SCTP_BUF_IS_EXTENDED(m)) {
  382                         sctp_log_mb(m, SCTP_MBUF_IALLOC);
  383                 }
  384         }
  385 #endif
  386         return (m);
  387 }
  388 
  389 
  390 #ifdef SCTP_PACKET_LOGGING
  391 void
  392 sctp_packet_log(struct mbuf *m, int length)
  393 {
  394         int *lenat, thisone;
  395         void *copyto;
  396         uint32_t *tick_tock;
  397         int total_len;
  398         int grabbed_lock = 0;
  399         int value, newval, thisend, thisbegin;
  400 
  401         /*
  402          * Buffer layout. -sizeof this entry (total_len) -previous end
  403          * (value) -ticks of log      (ticks) o -ip packet o -as logged -
  404          * where this started (thisbegin) x <--end points here
  405          */
  406         total_len = SCTP_SIZE32((length + (4 * sizeof(int))));
  407         /* Log a packet to the buffer. */
  408         if (total_len > SCTP_PACKET_LOG_SIZE) {
  409                 /* Can't log this packet I have not a buffer big enough */
  410                 return;
  411         }
  412         if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {
  413                 return;
  414         }
  415         atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1);
  416 try_again:
  417         if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  418                 SCTP_IP_PKTLOG_LOCK();
  419                 grabbed_lock = 1;
  420 again_locked:
  421                 value = SCTP_BASE_VAR(packet_log_end);
  422                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
  423                 if (newval >= SCTP_PACKET_LOG_SIZE) {
  424                         /* we wrapped */
  425                         thisbegin = 0;
  426                         thisend = total_len;
  427                 } else {
  428                         thisbegin = SCTP_BASE_VAR(packet_log_end);
  429                         thisend = newval;
  430                 }
  431                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
  432                         goto again_locked;
  433                 }
  434         } else {
  435                 value = SCTP_BASE_VAR(packet_log_end);
  436                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
  437                 if (newval >= SCTP_PACKET_LOG_SIZE) {
  438                         /* we wrapped */
  439                         thisbegin = 0;
  440                         thisend = total_len;
  441                 } else {
  442                         thisbegin = SCTP_BASE_VAR(packet_log_end);
  443                         thisend = newval;
  444                 }
  445                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
  446                         goto try_again;
  447                 }
  448         }
  449         /* Sanity check */
  450         if (thisend >= SCTP_PACKET_LOG_SIZE) {
  451                 printf("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",
  452                     thisbegin,
  453                     thisend,
  454                     SCTP_BASE_VAR(packet_log_writers),
  455                     grabbed_lock,
  456                     SCTP_BASE_VAR(packet_log_end));
  457                 SCTP_BASE_VAR(packet_log_end) = 0;
  458                 goto no_log;
  459 
  460         }
  461         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin];
  462         *lenat = total_len;
  463         lenat++;
  464         *lenat = value;
  465         lenat++;
  466         tick_tock = (uint32_t *) lenat;
  467         lenat++;
  468         *tick_tock = sctp_get_tick_count();
  469         copyto = (void *)lenat;
  470         thisone = thisend - sizeof(int);
  471         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone];
  472         *lenat = thisbegin;
  473         if (grabbed_lock) {
  474                 SCTP_IP_PKTLOG_UNLOCK();
  475                 grabbed_lock = 0;
  476         }
  477         m_copydata(m, 0, length, (caddr_t)copyto);
  478 no_log:
  479         if (grabbed_lock) {
  480                 SCTP_IP_PKTLOG_UNLOCK();
  481         }
  482         atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1);
  483 }
  484 
  485 
  486 int
  487 sctp_copy_out_packet_log(uint8_t * target, int length)
  488 {
  489         /*
  490          * We wind through the packet log starting at start copying up to
  491          * length bytes out. We return the number of bytes copied.
  492          */
  493         int tocopy, this_copy;
  494         int *lenat;
  495         int did_delay = 0;
  496 
  497         tocopy = length;
  498         if (length < (int)(2 * sizeof(int))) {
  499                 /* not enough room */
  500                 return (0);
  501         }
  502         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  503                 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK);
  504 again:
  505                 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {
  506                         /*
  507                          * we delay here for just a moment hoping the
  508                          * writer(s) that were present when we entered will
  509                          * have left and we only have locking ones that will
  510                          * contend with us for the lock. This does not
  511                          * assure 100% access, but its good enough for a
  512                          * logging facility like this.
  513                          */
  514                         did_delay = 1;
  515                         DELAY(10);
  516                         goto again;
  517                 }
  518         }
  519         SCTP_IP_PKTLOG_LOCK();
  520         lenat = (int *)target;
  521         *lenat = SCTP_BASE_VAR(packet_log_end);
  522         lenat++;
  523         this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);
  524         memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy);
  525         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  526                 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers),
  527                     SCTP_PKTLOG_WRITERS_NEED_LOCK);
  528         }
  529         SCTP_IP_PKTLOG_UNLOCK();
  530         return (this_copy + sizeof(int));
  531 }
  532 
  533 #endif

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