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: releng/12.0/sys/netinet/sctp_bsd_addr.c 336511 2018-07-19 20:16:33Z tuexen $");
   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 
   79 void
   80 sctp_wakeup_iterator(void)
   81 {
   82         wakeup(&sctp_it_ctl.iterator_running);
   83 }
   84 
   85 static void
   86 sctp_iterator_thread(void *v SCTP_UNUSED)
   87 {
   88         SCTP_IPI_ITERATOR_WQ_LOCK();
   89         /* In FreeBSD this thread never terminates. */
   90         for (;;) {
   91                 msleep(&sctp_it_ctl.iterator_running,
   92                     &sctp_it_ctl.ipi_iterator_wq_mtx,
   93                     0, "waiting_for_work", 0);
   94                 sctp_iterator_worker();
   95         }
   96 }
   97 
   98 void
   99 sctp_startup_iterator(void)
  100 {
  101         if (sctp_it_ctl.thread_proc) {
  102                 /* You only get one */
  103                 return;
  104         }
  105         /* Initialize global locks here, thus only once. */
  106         SCTP_ITERATOR_LOCK_INIT();
  107         SCTP_IPI_ITERATOR_WQ_INIT();
  108         TAILQ_INIT(&sctp_it_ctl.iteratorhead);
  109         kproc_create(sctp_iterator_thread,
  110             (void *)NULL,
  111             &sctp_it_ctl.thread_proc,
  112             RFPROC,
  113             SCTP_KTHREAD_PAGES,
  114             SCTP_KTRHEAD_NAME);
  115 }
  116 
  117 #ifdef INET6
  118 
  119 void
  120 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)
  121 {
  122         struct in6_ifaddr *ifa6;
  123 
  124         ifa6 = (struct in6_ifaddr *)ifa->ifa;
  125         ifa->flags = ifa6->ia6_flags;
  126         if (!MODULE_GLOBAL(ip6_use_deprecated)) {
  127                 if (ifa->flags &
  128                     IN6_IFF_DEPRECATED) {
  129                         ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
  130                 } else {
  131                         ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  132                 }
  133         } else {
  134                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  135         }
  136         if (ifa->flags &
  137             (IN6_IFF_DETACHED |
  138             IN6_IFF_ANYCAST |
  139             IN6_IFF_NOTREADY)) {
  140                 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
  141         } else {
  142                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
  143         }
  144 }
  145 #endif                          /* INET6 */
  146 
  147 
  148 static uint32_t
  149 sctp_is_desired_interface_type(struct ifnet *ifn)
  150 {
  151         int result;
  152 
  153         /* check the interface type to see if it's one we care about */
  154         switch (ifn->if_type) {
  155         case IFT_ETHER:
  156         case IFT_ISO88023:
  157         case IFT_ISO88024:
  158         case IFT_ISO88025:
  159         case IFT_ISO88026:
  160         case IFT_STARLAN:
  161         case IFT_P10:
  162         case IFT_P80:
  163         case IFT_HY:
  164         case IFT_FDDI:
  165         case IFT_XETHER:
  166         case IFT_ISDNBASIC:
  167         case IFT_ISDNPRIMARY:
  168         case IFT_PTPSERIAL:
  169         case IFT_OTHER:
  170         case IFT_PPP:
  171         case IFT_LOOP:
  172         case IFT_SLIP:
  173         case IFT_GIF:
  174         case IFT_L2VLAN:
  175         case IFT_STF:
  176         case IFT_IP:
  177         case IFT_IPOVERCDLC:
  178         case IFT_IPOVERCLAW:
  179         case IFT_PROPVIRTUAL:   /* NetGraph Virtual too */
  180         case IFT_VIRTUALIPADDRESS:
  181                 result = 1;
  182                 break;
  183         default:
  184                 result = 0;
  185         }
  186 
  187         return (result);
  188 }
  189 
  190 
  191 
  192 
  193 static void
  194 sctp_init_ifns_for_vrf(int vrfid)
  195 {
  196         /*
  197          * Here we must apply ANY locks needed by the IFN we access and also
  198          * make sure we lock any IFA that exists as we float through the
  199          * list of IFA's
  200          */
  201         struct ifnet *ifn;
  202         struct ifaddr *ifa;
  203         struct sctp_ifa *sctp_ifa;
  204         uint32_t ifa_flags;
  205 #ifdef INET6
  206         struct in6_ifaddr *ifa6;
  207 #endif
  208 
  209         IFNET_RLOCK();
  210         CK_STAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_link) {
  211                 if (sctp_is_desired_interface_type(ifn) == 0) {
  212                         /* non desired type */
  213                         continue;
  214                 }
  215                 IF_ADDR_RLOCK(ifn);
  216                 CK_STAILQ_FOREACH(ifa, &ifn->if_addrhead, ifa_link) {
  217                         if (ifa->ifa_addr == NULL) {
  218                                 continue;
  219                         }
  220                         switch (ifa->ifa_addr->sa_family) {
  221 #ifdef INET
  222                         case AF_INET:
  223                                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
  224                                         continue;
  225                                 }
  226                                 break;
  227 #endif
  228 #ifdef INET6
  229                         case AF_INET6:
  230                                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
  231                                         /* skip unspecifed addresses */
  232                                         continue;
  233                                 }
  234                                 break;
  235 #endif
  236                         default:
  237                                 continue;
  238                         }
  239                         switch (ifa->ifa_addr->sa_family) {
  240 #ifdef INET
  241                         case AF_INET:
  242                                 ifa_flags = 0;
  243                                 break;
  244 #endif
  245 #ifdef INET6
  246                         case AF_INET6:
  247                                 ifa6 = (struct in6_ifaddr *)ifa;
  248                                 ifa_flags = ifa6->ia6_flags;
  249                                 break;
  250 #endif
  251                         default:
  252                                 ifa_flags = 0;
  253                                 break;
  254                         }
  255                         sctp_ifa = sctp_add_addr_to_vrf(vrfid,
  256                             (void *)ifn,
  257                             ifn->if_index,
  258                             ifn->if_type,
  259                             ifn->if_xname,
  260                             (void *)ifa,
  261                             ifa->ifa_addr,
  262                             ifa_flags,
  263                             0);
  264                         if (sctp_ifa) {
  265                                 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
  266                         }
  267                 }
  268                 IF_ADDR_RUNLOCK(ifn);
  269         }
  270         IFNET_RUNLOCK();
  271 }
  272 
  273 void
  274 sctp_init_vrf_list(int vrfid)
  275 {
  276         if (vrfid > SCTP_MAX_VRF_ID)
  277                 /* can't do that */
  278                 return;
  279 
  280         /* Don't care about return here */
  281         (void)sctp_allocate_vrf(vrfid);
  282 
  283         /*
  284          * Now we need to build all the ifn's for this vrf and there
  285          * addresses
  286          */
  287         sctp_init_ifns_for_vrf(vrfid);
  288 }
  289 
  290 void
  291 sctp_addr_change(struct ifaddr *ifa, int cmd)
  292 {
  293         uint32_t ifa_flags = 0;
  294 
  295         if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
  296                 return;
  297         }
  298         /*
  299          * BSD only has one VRF, if this changes we will need to hook in the
  300          * right things here to get the id to pass to the address management
  301          * routine.
  302          */
  303         if (SCTP_BASE_VAR(first_time) == 0) {
  304                 /* Special test to see if my ::1 will showup with this */
  305                 SCTP_BASE_VAR(first_time) = 1;
  306                 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
  307         }
  308 
  309         if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
  310                 /* don't know what to do with this */
  311                 return;
  312         }
  313 
  314         if (ifa->ifa_addr == NULL) {
  315                 return;
  316         }
  317         if (sctp_is_desired_interface_type(ifa->ifa_ifp) == 0) {
  318                 /* non desired type */
  319                 return;
  320         }
  321         switch (ifa->ifa_addr->sa_family) {
  322 #ifdef INET
  323         case AF_INET:
  324                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
  325                         return;
  326                 }
  327                 break;
  328 #endif
  329 #ifdef INET6
  330         case AF_INET6:
  331                 ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags;
  332                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
  333                         /* skip unspecifed addresses */
  334                         return;
  335                 }
  336                 break;
  337 #endif
  338         default:
  339                 /* non inet/inet6 skip */
  340                 return;
  341         }
  342         if (cmd == RTM_ADD) {
  343                 (void)sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
  344                     ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type, ifa->ifa_ifp->if_xname,
  345                     (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
  346         } else {
  347 
  348                 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr,
  349                     ifa->ifa_ifp->if_index,
  350                     ifa->ifa_ifp->if_xname);
  351 
  352                 /*
  353                  * We don't bump refcount here so when it completes the
  354                  * final delete will happen.
  355                  */
  356         }
  357 }
  358 
  359 void
  360      sctp_add_or_del_interfaces(int (*pred) (struct ifnet *), int add){
  361         struct ifnet *ifn;
  362         struct ifaddr *ifa;
  363 
  364         IFNET_RLOCK();
  365         CK_STAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_link) {
  366                 if (!(*pred) (ifn)) {
  367                         continue;
  368                 }
  369                 CK_STAILQ_FOREACH(ifa, &ifn->if_addrhead, ifa_link) {
  370                         sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE);
  371                 }
  372         }
  373         IFNET_RUNLOCK();
  374 }
  375 
  376 struct mbuf *
  377 sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
  378     int how, int allonebuf, int type)
  379 {
  380         struct mbuf *m = NULL;
  381 
  382         m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
  383         if (m == NULL) {
  384                 /* bad, no memory */
  385                 return (m);
  386         }
  387         if (allonebuf) {
  388                 if (SCTP_BUF_SIZE(m) < space_needed) {
  389                         m_freem(m);
  390                         return (NULL);
  391                 }
  392                 KASSERT(SCTP_BUF_NEXT(m) == NULL, ("%s: no chain allowed", __FUNCTION__));
  393         }
  394 #ifdef SCTP_MBUF_LOGGING
  395         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  396                 sctp_log_mb(m, SCTP_MBUF_IALLOC);
  397         }
  398 #endif
  399         return (m);
  400 }
  401 
  402 
  403 #ifdef SCTP_PACKET_LOGGING
  404 void
  405 sctp_packet_log(struct mbuf *m)
  406 {
  407         int *lenat, thisone;
  408         void *copyto;
  409         uint32_t *tick_tock;
  410         int length;
  411         int total_len;
  412         int grabbed_lock = 0;
  413         int value, newval, thisend, thisbegin;
  414 
  415         /*
  416          * Buffer layout. -sizeof this entry (total_len) -previous end
  417          * (value) -ticks of log      (ticks) o -ip packet o -as logged -
  418          * where this started (thisbegin) x <--end points here
  419          */
  420         length = SCTP_HEADER_LEN(m);
  421         total_len = SCTP_SIZE32((length + (4 * sizeof(int))));
  422         /* Log a packet to the buffer. */
  423         if (total_len > SCTP_PACKET_LOG_SIZE) {
  424                 /* Can't log this packet I have not a buffer big enough */
  425                 return;
  426         }
  427         if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {
  428                 return;
  429         }
  430         atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1);
  431 try_again:
  432         if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  433                 SCTP_IP_PKTLOG_LOCK();
  434                 grabbed_lock = 1;
  435 again_locked:
  436                 value = SCTP_BASE_VAR(packet_log_end);
  437                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
  438                 if (newval >= SCTP_PACKET_LOG_SIZE) {
  439                         /* we wrapped */
  440                         thisbegin = 0;
  441                         thisend = total_len;
  442                 } else {
  443                         thisbegin = SCTP_BASE_VAR(packet_log_end);
  444                         thisend = newval;
  445                 }
  446                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
  447                         goto again_locked;
  448                 }
  449         } else {
  450                 value = SCTP_BASE_VAR(packet_log_end);
  451                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
  452                 if (newval >= SCTP_PACKET_LOG_SIZE) {
  453                         /* we wrapped */
  454                         thisbegin = 0;
  455                         thisend = total_len;
  456                 } else {
  457                         thisbegin = SCTP_BASE_VAR(packet_log_end);
  458                         thisend = newval;
  459                 }
  460                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
  461                         goto try_again;
  462                 }
  463         }
  464         /* Sanity check */
  465         if (thisend >= SCTP_PACKET_LOG_SIZE) {
  466                 SCTP_PRINTF("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",
  467                     thisbegin,
  468                     thisend,
  469                     SCTP_BASE_VAR(packet_log_writers),
  470                     grabbed_lock,
  471                     SCTP_BASE_VAR(packet_log_end));
  472                 SCTP_BASE_VAR(packet_log_end) = 0;
  473                 goto no_log;
  474 
  475         }
  476         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin];
  477         *lenat = total_len;
  478         lenat++;
  479         *lenat = value;
  480         lenat++;
  481         tick_tock = (uint32_t *)lenat;
  482         lenat++;
  483         *tick_tock = sctp_get_tick_count();
  484         copyto = (void *)lenat;
  485         thisone = thisend - sizeof(int);
  486         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone];
  487         *lenat = thisbegin;
  488         if (grabbed_lock) {
  489                 SCTP_IP_PKTLOG_UNLOCK();
  490                 grabbed_lock = 0;
  491         }
  492         m_copydata(m, 0, length, (caddr_t)copyto);
  493 no_log:
  494         if (grabbed_lock) {
  495                 SCTP_IP_PKTLOG_UNLOCK();
  496         }
  497         atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1);
  498 }
  499 
  500 
  501 int
  502 sctp_copy_out_packet_log(uint8_t *target, int length)
  503 {
  504         /*
  505          * We wind through the packet log starting at start copying up to
  506          * length bytes out. We return the number of bytes copied.
  507          */
  508         int tocopy, this_copy;
  509         int *lenat;
  510         int did_delay = 0;
  511 
  512         tocopy = length;
  513         if (length < (int)(2 * sizeof(int))) {
  514                 /* not enough room */
  515                 return (0);
  516         }
  517         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  518                 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK);
  519 again:
  520                 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {
  521                         /*
  522                          * we delay here for just a moment hoping the
  523                          * writer(s) that were present when we entered will
  524                          * have left and we only have locking ones that will
  525                          * contend with us for the lock. This does not
  526                          * assure 100% access, but its good enough for a
  527                          * logging facility like this.
  528                          */
  529                         did_delay = 1;
  530                         DELAY(10);
  531                         goto again;
  532                 }
  533         }
  534         SCTP_IP_PKTLOG_LOCK();
  535         lenat = (int *)target;
  536         *lenat = SCTP_BASE_VAR(packet_log_end);
  537         lenat++;
  538         this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);
  539         memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy);
  540         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
  541                 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers),
  542                     SCTP_PKTLOG_WRITERS_NEED_LOCK);
  543         }
  544         SCTP_IP_PKTLOG_UNLOCK();
  545         return (this_copy + sizeof(int));
  546 }
  547 
  548 #endif
Cache object: dc07d0bd8c986099d88c0476f38922b0
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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
