sys/netinet/sctp_bsd_addr.c

   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();
 100                 }
 101                 sctp_iterator_worker();
 102         }
 103 }
 104
 105 void
 106 sctp_startup_iterator(void)
 107 {
 108         int ret;
 109
 110         ret = kproc_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