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         if (sctp_it_ctl.thread_proc) {
  100                 /* You only get one */
  101                 return;
  102         }
  103         /* Initialize global locks here, thus only once. */
  104         SCTP_ITERATOR_LOCK_INIT();
  105         SCTP_IPI_ITERATOR_WQ_INIT();
  106         TAILQ_INIT(&sctp_it_ctl.iteratorhead);
  107         kproc_create(sctp_iterator_thread,
  108             (void *)NULL,
  109             &sctp_it_ctl.thread_proc,
  110             RFPROC,
  111             SCTP_KTHREAD_PAGES,
  112             SCTP_KTRHEAD_NAME);
  113 }
  114 
  115 #ifdef INET6
  116 
  117 void
  118 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)
  119 {
  120         struct in6_ifaddr *ifa6;
  121 
  122         ifa6 = (struct in6_ifaddr *)ifa->ifa;
  123         ifa->flags = ifa6->ia6_flags;
  124         if (!MODULE_GLOBAL(ip6_use_deprecated)) {
  125                 if (ifa->flags &
  126                     IN6_IFF_DEPRECATED) {
  127                         ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
  128                 } else {
  129                         ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  130                 }
  131         } else {
  132                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  133         }
  134         if (ifa->flags &
  135             (IN6_IFF_DETACHED |
  136             IN6_IFF_ANYCAST |
  137             IN6_IFF_NOTREADY)) {
  138                 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
  139         } else {
  140                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  141         }
  142 }
  143 #endif                          /* INET6 */
  144 
  145 
  146 static uint32_t
  147 sctp_is_desired_interface_type(struct ifnet *ifn)
  148 {
  149         int result;
  150 
  151         /* check the interface type to see if it's one we care about */
  152         switch (ifn->if_type) {
  153         case IFT_ETHER:
  154         case IFT_ISO88023:
  155         case IFT_ISO88024:
  156         case IFT_ISO88025:
  157         case IFT_ISO88026:
  158         case IFT_STARLAN:
  159         case IFT_P10:
  160         case IFT_P80:
  161         case IFT_HY:
  162         case IFT_FDDI:
  163         case IFT_XETHER:
  164         case IFT_ISDNBASIC:
  165         case IFT_ISDNPRIMARY:
  166         case IFT_PTPSERIAL:
  167         case IFT_OTHER:
  168         case IFT_PPP:
  169         case IFT_LOOP:
  170         case IFT_SLIP:
  171         case IFT_GIF:
  172         case IFT_L2VLAN:
  173         case IFT_STF:
  174         case IFT_IP:
  175         case IFT_IPOVERCDLC:
  176         case IFT_IPOVERCLAW:
  177         case IFT_PROPVIRTUAL:   /* NetGraph Virtual too */
  178         case IFT_VIRTUALIPADDRESS:
  179                 result = 1;
  180                 break;
  181         default:
  182                 result = 0;
  183         }
  184 
  185         return (result);
  186 }
  187 
  188 
  189 
  190 
  191 static void
  192 sctp_init_ifns_for_vrf(int vrfid)
  193 {
  194         /*
  195          * Here we must apply ANY locks needed by the IFN we access and also
  196          * make sure we lock any IFA that exists as we float through the
  197          * list of IFA's
  198          */
  199         struct ifnet *ifn;
  200         struct ifaddr *ifa;
  201         struct sctp_ifa *sctp_ifa;
  202         uint32_t ifa_flags;
  203 #ifdef INET6
  204         struct in6_ifaddr *ifa6;
  205 #endif
  206 
  207         IFNET_RLOCK();
  208         TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {
  209                 if (sctp_is_desired_interface_type(ifn) == 0) {
  210                         /* non desired type */
  211                         continue;
  212                 }
  213                 IF_ADDR_RLOCK(ifn);
  214                 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
  215                         if (ifa->ifa_addr == NULL) {
  216                                 continue;
  217                         }
  218                         switch (ifa->ifa_addr->sa_family) {
  219 #ifdef INET
  220                         case AF_INET:
  221                                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
  222                                         continue;
  223                                 }
  224                                 break;
  225 #endif
  226 #ifdef INET6
  227                         case AF_INET6:
  228                                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
  229                                         /* skip unspecifed addresses */
  230                                         continue;
  231                                 }
  232                                 break;
  233 #endif
  234                         default:
  235                                 continue;
  236                         }
  237                         switch (ifa->ifa_addr->sa_family) {
  238 #ifdef INET
  239                         case AF_INET:
  240                                 ifa_flags = 0;
  241                                 break;
  242 #endif
  243 #ifdef INET6
  244                         case AF_INET6:
  245                                 ifa6 = (struct in6_ifaddr *)ifa;
  246                                 ifa_flags = ifa6->ia6_flags;
  247                                 break;
  248 #endif
  249                         default:
  250                                 ifa_flags = 0;
  251                                 break;
  252                         }
  253                         sctp_ifa = sctp_add_addr_to_vrf(vrfid,
  254                             (void *)ifn,
  255                             ifn->if_index,
  256                             ifn->if_type,
  257                             ifn->if_xname,
  258                             (void *)ifa,
  259                             ifa->ifa_addr,
  260                             ifa_flags,
  261                             0);
  262                         if (sctp_ifa) {
  263                                 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
  264                         }
  265                 }
  266                 IF_ADDR_RUNLOCK(ifn);
  267         }
  268         IFNET_RUNLOCK();
  269 }
  270 
  271 void
  272 sctp_init_vrf_list(int vrfid)
  273 {
  274         if (vrfid > SCTP_MAX_VRF_ID)
  275                 /* can't do that */
  276                 return;
  277 
  278         /* Don't care about return here */
  279         (void)sctp_allocate_vrf(vrfid);
  280 
  281         /*
  282          * Now we need to build all the ifn's for this vrf and there
  283          * addresses
  284          */
  285         sctp_init_ifns_for_vrf(vrfid);
  286 }
  287 
  288 void
  289 sctp_addr_change(struct ifaddr *ifa, int cmd)
  290 {
  291         uint32_t ifa_flags = 0;
  292 
  293         if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
  294                 return;
  295         }
  296         /*
  297          * BSD only has one VRF, if this changes we will need to hook in the
  298          * right things here to get the id to pass to the address management
  299          * routine.
  300          */
  301         if (SCTP_BASE_VAR(first_time) == 0) {
  302                 /* Special test to see if my ::1 will showup with this */
  303                 SCTP_BASE_VAR(first_time) = 1;
  304                 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
  305         }
  306 
  307         if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
  308                 /* don't know what to do with this */
  309                 return;
  310         }
  311 
  312         if (ifa->ifa_addr == NULL) {
  313                 return;
  314         }
  315         if (sctp_is_desired_interface_type(ifa->ifa_ifp) == 0) {
  316                 /* non desired type */
  317                 return;
  318         }
  319         switch (ifa->ifa_addr->sa_family) {
  320 #ifdef INET
  321         case AF_INET:
  322                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
  323                         return;
  324                 }
  325                 break;
  326 #endif
  327 #ifdef INET6
  328         case AF_INET6:
  329                 ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags;
  330                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
  331                         /* skip unspecifed addresses */
  332                         return;
  333                 }
  334                 break;
  335 #endif
  336         default:
  337                 /* non inet/inet6 skip */
  338                 return;
  339         }
  340         if (cmd == RTM_ADD) {
  341                 (void)sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
  342                     ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type, ifa->ifa_ifp->if_xname,
  343                     (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
  344         } else {
  345 
  346                 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr,
  347                     ifa->ifa_ifp->if_index,
  348                     ifa->ifa_ifp->if_xname);
  349 
  350                 /*
  351                  * We don't bump refcount here so when it completes the
  352                  * final delete will happen.
  353                  */
  354         }
  355 }
  356 
  357 void
  358      sctp_add_or_del_interfaces(int (*pred) (struct ifnet *), int add){
  359         struct ifnet *ifn;
  360         struct ifaddr *ifa;
  361 
  362         IFNET_RLOCK();
  363         TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {
  364                 if (!(*pred) (ifn)) {
  365                         continue;
  366                 }
  367                 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
  368                         sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE);
  369                 }
  370         }
  371         IFNET_RUNLOCK();
  372 }
  373 
  374 struct mbuf *
  375 sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
  376     int how, int allonebuf, int type)
  377 {
  378         struct mbuf *m = NULL;
  379 
  380         m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
  381         if (m == NULL) {
  382                 /* bad, no memory */
  383                 return (m);
  384         }
  385         if (allonebuf) {
  386                 if (SCTP_BUF_SIZE(m) < space_needed) {
  387                         m_freem(m);
  388                         return (NULL);
  389                 }
  390                 KASSERT(SCTP_BUF_NEXT(m) == NULL, ("%s: no chain allowed", __FUNCTION__));
  391         }
  392 #ifdef SCTP_MBUF_LOGGING
  393         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  394                 sctp_log_mb(m, SCTP_MBUF_IALLOC);
  395         }
  396 #endif
  397         return (m);
  398 }
  399 
  400 
  401 #ifdef SCTP_PACKET_LOGGING
  402 void
  403 sctp_packet_log(struct mbuf *m)
  404 {
  405         int *lenat, thisone;
  406         void *copyto;
  407         uint32_t *tick_tock;
  408         int length;
  409         int total_len;
  410         int grabbed_lock = 0;
  411         int value, newval, thisend, thisbegin;
  412 
  413         /*
  414          * Buffer layout. -sizeof this entry (total_len) -previous end
  415          * (value) -ticks of log      (ticks) o -ip packet o -as logged -
  416          * where this started (thisbegin) x <--end points here
  417          */
  418         length = SCTP_HEADER_LEN(m);
  419         total_len = SCTP_SIZE32((length + (4 * sizeof(int))));
  420         /* Log a packet to the buffer. */
  421         if (total_len > SCTP_PACKET_LOG_SIZE) {
  422                 /* Can't log this packet I have not a buffer big enough */
  423                 return;
  424         }
  425         if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {
  426                 return;
  427         }
  428         atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1);
  429 try_again:
  430         if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  431                 SCTP_IP_PKTLOG_LOCK();
  432                 grabbed_lock = 1;
  433 again_locked:
  434                 value = SCTP_BASE_VAR(packet_log_end);
  435                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
  436                 if (newval >= SCTP_PACKET_LOG_SIZE) {
  437                         /* we wrapped */
  438                         thisbegin = 0;
  439                         thisend = total_len;
  440                 } else {
  441                         thisbegin = SCTP_BASE_VAR(packet_log_end);
  442                         thisend = newval;
  443                 }
  444                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
  445                         goto again_locked;
  446                 }
  447         } else {
  448                 value = SCTP_BASE_VAR(packet_log_end);
  449                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
  450                 if (newval >= SCTP_PACKET_LOG_SIZE) {
  451                         /* we wrapped */
  452                         thisbegin = 0;
  453                         thisend = total_len;
  454                 } else {
  455                         thisbegin = SCTP_BASE_VAR(packet_log_end);
  456                         thisend = newval;
  457                 }
  458                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
  459                         goto try_again;
  460                 }
  461         }
  462         /* Sanity check */
  463         if (thisend >= SCTP_PACKET_LOG_SIZE) {
  464                 SCTP_PRINTF("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",
  465                     thisbegin,
  466                     thisend,
  467                     SCTP_BASE_VAR(packet_log_writers),
  468                     grabbed_lock,
  469                     SCTP_BASE_VAR(packet_log_end));
  470                 SCTP_BASE_VAR(packet_log_end) = 0;
  471                 goto no_log;
  472 
  473         }
  474         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin];
  475         *lenat = total_len;
  476         lenat++;
  477         *lenat = value;
  478         lenat++;
  479         tick_tock = (uint32_t *)lenat;
  480         lenat++;
  481         *tick_tock = sctp_get_tick_count();
  482         copyto = (void *)lenat;
  483         thisone = thisend - sizeof(int);
  484         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone];
  485         *lenat = thisbegin;
  486         if (grabbed_lock) {
  487                 SCTP_IP_PKTLOG_UNLOCK();
  488                 grabbed_lock = 0;
  489         }
  490         m_copydata(m, 0, length, (caddr_t)copyto);
  491 no_log:
  492         if (grabbed_lock) {
  493                 SCTP_IP_PKTLOG_UNLOCK();
  494         }
  495         atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1);
  496 }
  497 
  498 
  499 int
  500 sctp_copy_out_packet_log(uint8_t *target, int length)
  501 {
  502         /*
  503          * We wind through the packet log starting at start copying up to
  504          * length bytes out. We return the number of bytes copied.
  505          */
  506         int tocopy, this_copy;
  507         int *lenat;
  508         int did_delay = 0;
  509 
  510         tocopy = length;
  511         if (length < (int)(2 * sizeof(int))) {
  512                 /* not enough room */
  513                 return (0);
  514         }
  515         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  516                 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK);
  517 again:
  518                 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {
  519                         /*
  520                          * we delay here for just a moment hoping the
  521                          * writer(s) that were present when we entered will
  522                          * have left and we only have locking ones that will
  523                          * contend with us for the lock. This does not
  524                          * assure 100% access, but its good enough for a
  525                          * logging facility like this.
  526                          */
  527                         did_delay = 1;
  528                         DELAY(10);
  529                         goto again;
  530                 }
  531         }
  532         SCTP_IP_PKTLOG_LOCK();
  533         lenat = (int *)target;
  534         *lenat = SCTP_BASE_VAR(packet_log_end);
  535         lenat++;
  536         this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);
  537         memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy);
  538         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  539                 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers),
  540                     SCTP_PKTLOG_WRITERS_NEED_LOCK);
  541         }
  542         SCTP_IP_PKTLOG_UNLOCK();
  543         return (this_copy + sizeof(int));
  544 }
  545 
  546 #endif
Cache object: a69afb0a7f87fada0891df1b470035b4
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FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_bsd_addr.c

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