sctp_bsd_addr.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions are met:
   10  *
   11  * a) Redistributions of source code must retain the above copyright notice,
   12  *    this list of conditions and the following disclaimer.
   13  *
   14  * b) Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in
   16  *    the documentation and/or other materials provided with the distribution.
   17  *
   18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   19  *    contributors may be used to endorse or promote products derived
   20  *    from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   32  * THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include <netinet/sctp_os.h>
   39 #include <netinet/sctp_var.h>
   40 #include <netinet/sctp_pcb.h>
   41 #include <netinet/sctp_header.h>
   42 #include <netinet/sctputil.h>
   43 #include <netinet/sctp_output.h>
   44 #include <netinet/sctp_bsd_addr.h>
   45 #include <netinet/sctp_uio.h>
   46 #include <netinet/sctputil.h>
   47 #include <netinet/sctp_timer.h>
   48 #include <netinet/sctp_asconf.h>
   49 #include <netinet/sctp_sysctl.h>
   50 #include <netinet/sctp_indata.h>
   51 #include <sys/unistd.h>
   52 
   53 /* Declare all of our malloc named types */
   54 MALLOC_DEFINE(SCTP_M_MAP, "sctp_map", "sctp asoc map descriptor");
   55 MALLOC_DEFINE(SCTP_M_STRMI, "sctp_stri", "sctp stream in array");
   56 MALLOC_DEFINE(SCTP_M_STRMO, "sctp_stro", "sctp stream out array");
   57 MALLOC_DEFINE(SCTP_M_ASC_ADDR, "sctp_aadr", "sctp asconf address");
   58 MALLOC_DEFINE(SCTP_M_ASC_IT, "sctp_a_it", "sctp asconf iterator");
   59 MALLOC_DEFINE(SCTP_M_AUTH_CL, "sctp_atcl", "sctp auth chunklist");
   60 MALLOC_DEFINE(SCTP_M_AUTH_KY, "sctp_atky", "sctp auth key");
   61 MALLOC_DEFINE(SCTP_M_AUTH_HL, "sctp_athm", "sctp auth hmac list");
   62 MALLOC_DEFINE(SCTP_M_AUTH_IF, "sctp_athi", "sctp auth info");
   63 MALLOC_DEFINE(SCTP_M_STRESET, "sctp_stre", "sctp stream reset");
   64 MALLOC_DEFINE(SCTP_M_CMSG, "sctp_cmsg", "sctp CMSG buffer");
   65 MALLOC_DEFINE(SCTP_M_COPYAL, "sctp_cpal", "sctp copy all");
   66 MALLOC_DEFINE(SCTP_M_VRF, "sctp_vrf", "sctp vrf struct");
   67 MALLOC_DEFINE(SCTP_M_IFA, "sctp_ifa", "sctp ifa struct");
   68 MALLOC_DEFINE(SCTP_M_IFN, "sctp_ifn", "sctp ifn struct");
   69 MALLOC_DEFINE(SCTP_M_TIMW, "sctp_timw", "sctp time block");
   70 MALLOC_DEFINE(SCTP_M_MVRF, "sctp_mvrf", "sctp mvrf pcb list");
   71 MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control");
   72 MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option");
   73 MALLOC_DEFINE(SCTP_M_MCORE, "sctp_mcore", "sctp mcore queue");
   74 
   75 /* Global NON-VNET structure that controls the iterator */
   76 struct iterator_control sctp_it_ctl;
   77 
   78 void
   79 sctp_wakeup_iterator(void)
   80 {
   81         wakeup(&sctp_it_ctl.iterator_running);
   82 }
   83 
   84 static void
   85 sctp_iterator_thread(void *v SCTP_UNUSED)
   86 {
   87         SCTP_IPI_ITERATOR_WQ_LOCK();
   88         /* In FreeBSD this thread never terminates. */
   89         for (;;) {
   90                 msleep(&sctp_it_ctl.iterator_running,
   91                     &sctp_it_ctl.ipi_iterator_wq_mtx,
   92                     0, "waiting_for_work", 0);
   93                 sctp_iterator_worker();
   94         }
   95 }
   96 
   97 void
   98 sctp_startup_iterator(void)
   99 {
  100         if (sctp_it_ctl.thread_proc) {
  101                 /* You only get one */
  102                 return;
  103         }
  104         /* Initialize global locks here, thus only once. */
  105         SCTP_ITERATOR_LOCK_INIT();
  106         SCTP_IPI_ITERATOR_WQ_INIT();
  107         TAILQ_INIT(&sctp_it_ctl.iteratorhead);
  108         kproc_create(sctp_iterator_thread,
  109             (void *)NULL,
  110             &sctp_it_ctl.thread_proc,
  111             0,
  112             SCTP_KTHREAD_PAGES,
  113             SCTP_KTRHEAD_NAME);
  114 }
  115 
  116 #ifdef INET6
  117 
  118 void
  119 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)
  120 {
  121         struct in6_ifaddr *ifa6;
  122 
  123         ifa6 = (struct in6_ifaddr *)ifa->ifa;
  124         ifa->flags = ifa6->ia6_flags;
  125         if (!MODULE_GLOBAL(ip6_use_deprecated)) {
  126                 if (ifa->flags &
  127                     IN6_IFF_DEPRECATED) {
  128                         ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
  129                 } else {
  130                         ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  131                 }
  132         } else {
  133                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  134         }
  135         if (ifa->flags &
  136             (IN6_IFF_DETACHED |
  137             IN6_IFF_ANYCAST |
  138             IN6_IFF_NOTREADY)) {
  139                 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
  140         } else {
  141                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  142         }
  143 }
  144 #endif                          /* INET6 */
  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 static void
  189 sctp_init_ifns_for_vrf(int vrfid)
  190 {
  191         /*
  192          * Here we must apply ANY locks needed by the IFN we access and also
  193          * make sure we lock any IFA that exists as we float through the
  194          * list of IFA's
  195          */
  196         struct epoch_tracker et;
  197         struct ifnet *ifn;
  198         struct ifaddr *ifa;
  199         struct sctp_ifa *sctp_ifa;
  200         uint32_t ifa_flags;
  201 #ifdef INET6
  202         struct in6_ifaddr *ifa6;
  203 #endif
  204 
  205         IFNET_RLOCK();
  206         NET_EPOCH_ENTER(et);
  207         CK_STAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_link) {
  208                 if (sctp_is_desired_interface_type(ifn) == 0) {
  209                         /* non desired type */
  210                         continue;
  211                 }
  212                 CK_STAILQ_FOREACH(ifa, &ifn->if_addrhead, ifa_link) {
  213                         if (ifa->ifa_addr == NULL) {
  214                                 continue;
  215                         }
  216                         switch (ifa->ifa_addr->sa_family) {
  217 #ifdef INET
  218                         case AF_INET:
  219                                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
  220                                         continue;
  221                                 }
  222                                 break;
  223 #endif
  224 #ifdef INET6
  225                         case AF_INET6:
  226                                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
  227                                         /* skip unspecified addresses */
  228                                         continue;
  229                                 }
  230                                 break;
  231 #endif
  232                         default:
  233                                 continue;
  234                         }
  235                         switch (ifa->ifa_addr->sa_family) {
  236 #ifdef INET
  237                         case AF_INET:
  238                                 ifa_flags = 0;
  239                                 break;
  240 #endif
  241 #ifdef INET6
  242                         case AF_INET6:
  243                                 ifa6 = (struct in6_ifaddr *)ifa;
  244                                 ifa_flags = ifa6->ia6_flags;
  245                                 break;
  246 #endif
  247                         default:
  248                                 ifa_flags = 0;
  249                                 break;
  250                         }
  251                         sctp_ifa = sctp_add_addr_to_vrf(vrfid,
  252                             (void *)ifn,
  253                             ifn->if_index,
  254                             ifn->if_type,
  255                             ifn->if_xname,
  256                             (void *)ifa,
  257                             ifa->ifa_addr,
  258                             ifa_flags,
  259                             0);
  260                         if (sctp_ifa) {
  261                                 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
  262                         }
  263                 }
  264         }
  265         NET_EPOCH_EXIT(et);
  266         IFNET_RUNLOCK();
  267 }
  268 
  269 void
  270 sctp_init_vrf_list(int vrfid)
  271 {
  272         if (vrfid > SCTP_MAX_VRF_ID)
  273                 /* can't do that */
  274                 return;
  275 
  276         /* Don't care about return here */
  277         (void)sctp_allocate_vrf(vrfid);
  278 
  279         /*
  280          * Now we need to build all the ifn's for this vrf and there
  281          * addresses
  282          */
  283         sctp_init_ifns_for_vrf(vrfid);
  284 }
  285 
  286 void
  287 sctp_addr_change(struct ifaddr *ifa, int cmd)
  288 {
  289         uint32_t ifa_flags = 0;
  290 
  291         if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
  292                 return;
  293         }
  294         /*
  295          * BSD only has one VRF, if this changes we will need to hook in the
  296          * right things here to get the id to pass to the address management
  297          * routine.
  298          */
  299         if (SCTP_BASE_VAR(first_time) == 0) {
  300                 /* Special test to see if my ::1 will showup with this */
  301                 SCTP_BASE_VAR(first_time) = 1;
  302                 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
  303         }
  304 
  305         if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
  306                 /* don't know what to do with this */
  307                 return;
  308         }
  309 
  310         if (ifa->ifa_addr == NULL) {
  311                 return;
  312         }
  313         if (sctp_is_desired_interface_type(ifa->ifa_ifp) == 0) {
  314                 /* non desired type */
  315                 return;
  316         }
  317         switch (ifa->ifa_addr->sa_family) {
  318 #ifdef INET
  319         case AF_INET:
  320                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
  321                         return;
  322                 }
  323                 break;
  324 #endif
  325 #ifdef INET6
  326         case AF_INET6:
  327                 ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags;
  328                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
  329                         /* skip unspecified addresses */
  330                         return;
  331                 }
  332                 break;
  333 #endif
  334         default:
  335                 /* non inet/inet6 skip */
  336                 return;
  337         }
  338         if (cmd == RTM_ADD) {
  339                 (void)sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
  340                     ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type, ifa->ifa_ifp->if_xname,
  341                     (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
  342         } else {
  343                 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr,
  344                     ifa->ifa_ifp->if_index,
  345                     ifa->ifa_ifp->if_xname);
  346 
  347                 /*
  348                  * We don't bump refcount here so when it completes the
  349                  * final delete will happen.
  350                  */
  351         }
  352 }
  353 
  354 void
  355 sctp_addr_change_event_handler(void *arg __unused, struct ifaddr *ifa, int cmd)
  356 {
  357         sctp_addr_change(ifa, cmd);
  358 }
  359 
  360 struct mbuf *
  361 sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
  362     int how, int allonebuf, int type)
  363 {
  364         struct mbuf *m = NULL;
  365 
  366         m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
  367         if (m == NULL) {
  368                 /* bad, no memory */
  369                 return (m);
  370         }
  371         if (allonebuf) {
  372                 if (SCTP_BUF_SIZE(m) < space_needed) {
  373                         m_freem(m);
  374                         return (NULL);
  375                 }
  376                 KASSERT(SCTP_BUF_NEXT(m) == NULL, ("%s: no chain allowed", __func__));
  377         }
  378 #ifdef SCTP_MBUF_LOGGING
  379         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  380                 sctp_log_mb(m, SCTP_MBUF_IALLOC);
  381         }
  382 #endif
  383         return (m);
  384 }
  385 
  386 #ifdef SCTP_PACKET_LOGGING
  387 void
  388 sctp_packet_log(struct mbuf *m)
  389 {
  390         int *lenat, thisone;
  391         void *copyto;
  392         uint32_t *tick_tock;
  393         int length;
  394         int total_len;
  395         int grabbed_lock = 0;
  396         int value, newval, thisend, thisbegin;
  397 
  398         /*
  399          * Buffer layout. -sizeof this entry (total_len) -previous end
  400          * (value) -ticks of log      (ticks) o -ip packet o -as logged -
  401          * where this started (thisbegin) x <--end points here
  402          */
  403         length = SCTP_HEADER_LEN(m);
  404         total_len = SCTP_SIZE32((length + (4 * sizeof(int))));
  405         /* Log a packet to the buffer. */
  406         if (total_len > SCTP_PACKET_LOG_SIZE) {
  407                 /* Can't log this packet I have not a buffer big enough */
  408                 return;
  409         }
  410         if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {
  411                 return;
  412         }
  413         atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1);
  414 try_again:
  415         if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  416                 SCTP_IP_PKTLOG_LOCK();
  417                 grabbed_lock = 1;
  418 again_locked:
  419                 value = SCTP_BASE_VAR(packet_log_end);
  420                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
  421                 if (newval >= SCTP_PACKET_LOG_SIZE) {
  422                         /* we wrapped */
  423                         thisbegin = 0;
  424                         thisend = total_len;
  425                 } else {
  426                         thisbegin = SCTP_BASE_VAR(packet_log_end);
  427                         thisend = newval;
  428                 }
  429                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
  430                         goto again_locked;
  431                 }
  432         } else {
  433                 value = SCTP_BASE_VAR(packet_log_end);
  434                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
  435                 if (newval >= SCTP_PACKET_LOG_SIZE) {
  436                         /* we wrapped */
  437                         thisbegin = 0;
  438                         thisend = total_len;
  439                 } else {
  440                         thisbegin = SCTP_BASE_VAR(packet_log_end);
  441                         thisend = newval;
  442                 }
  443                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
  444                         goto try_again;
  445                 }
  446         }
  447         /* Sanity check */
  448         if (thisend >= SCTP_PACKET_LOG_SIZE) {
  449                 SCTP_PRINTF("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",
  450                     thisbegin,
  451                     thisend,
  452                     SCTP_BASE_VAR(packet_log_writers),
  453                     grabbed_lock,
  454                     SCTP_BASE_VAR(packet_log_end));
  455                 SCTP_BASE_VAR(packet_log_end) = 0;
  456                 goto no_log;
  457         }
  458         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin];
  459         *lenat = total_len;
  460         lenat++;
  461         *lenat = value;
  462         lenat++;
  463         tick_tock = (uint32_t *)lenat;
  464         lenat++;
  465         *tick_tock = sctp_get_tick_count();
  466         copyto = (void *)lenat;
  467         thisone = thisend - sizeof(int);
  468         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone];
  469         *lenat = thisbegin;
  470         if (grabbed_lock) {
  471                 SCTP_IP_PKTLOG_UNLOCK();
  472                 grabbed_lock = 0;
  473         }
  474         m_copydata(m, 0, length, (caddr_t)copyto);
  475 no_log:
  476         if (grabbed_lock) {
  477                 SCTP_IP_PKTLOG_UNLOCK();
  478         }
  479         atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1);
  480 }
  481 
  482 int
  483 sctp_copy_out_packet_log(uint8_t *target, int length)
  484 {
  485         /*
  486          * We wind through the packet log starting at start copying up to
  487          * length bytes out. We return the number of bytes copied.
  488          */
  489         int this_copy;
  490         int *lenat;
  491         int did_delay = 0;
  492 
  493         if (length < (int)(2 * sizeof(int))) {
  494                 /* not enough room */
  495                 return (0);
  496         }
  497         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  498                 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK);
  499 again:
  500                 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {
  501                         /*
  502                          * we delay here for just a moment hoping the
  503                          * writer(s) that were present when we entered will
  504                          * have left and we only have locking ones that will
  505                          * contend with us for the lock. This does not
  506                          * assure 100% access, but its good enough for a
  507                          * logging facility like this.
  508                          */
  509                         did_delay = 1;
  510                         DELAY(10);
  511                         goto again;
  512                 }
  513         }
  514         SCTP_IP_PKTLOG_LOCK();
  515         lenat = (int *)target;
  516         *lenat = SCTP_BASE_VAR(packet_log_end);
  517         lenat++;
  518         this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);
  519         memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy);
  520         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  521                 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers),
  522                     SCTP_PKTLOG_WRITERS_NEED_LOCK);
  523         }
  524         SCTP_IP_PKTLOG_UNLOCK();
  525         return (this_copy + sizeof(int));
  526 }
  527 
  528 #endif
Cache object: 479815539e7932aff74a8eac4e37a919
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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
