src/charon/sa/ike_sa_manager.c

   1 /**
   2  * @file ike_sa_manager.c
   3  *
   4  * @brief Implementation of ike_sa_mananger_t.
   5  *
   6  */
   7
   8 /*
   9  * Copyright (C) 2005-2006 Martin Willi
  10  * Copyright (C) 2005 Jan Hutter
  11  * Hochschule fuer Technik Rapperswil
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the
  15  * Free Software Foundation; either version 2 of the License, or (at your
  16  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  20  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  21  * for more details.
  22  */
  23
  24 #include <pthread.h>
  25 #include <string.h>
  26
  27 #include "ike_sa_manager.h"
  28
  29 #include <daemon.h>
  30 #include <sa/ike_sa_id.h>
  31 #include <bus/bus.h>
  32 #include <utils/linked_list.h>
  33
  34 typedef struct entry_t entry_t;
  35
  36 /**
  37  * An entry in the linked list, contains IKE_SA, locking and lookup data.
  38  */
  39 struct entry_t {
  40
  41         /**
  42          * Number of threads waiting for this ike_sa_t object.
  43          */
  44         int waiting_threads;
  45
  46         /**
  47          * Condvar where threads can wait until ike_sa_t object is free for use again.
  48          */
  49         pthread_cond_t condvar;
  50
  51         /**
  52          * Is this ike_sa currently checked out?
  53          */
  54         bool checked_out;
  55
  56         /**
  57          * Does this SA drives out new threads?
  58          */
  59         bool driveout_new_threads;
  60
  61         /**
  62          * Does this SA drives out waiting threads?
  63          */
  64         bool driveout_waiting_threads;
  65
  66         /**
  67          * Identifiaction of an IKE_SA (SPIs).
  68          */
  69         ike_sa_id_t *ike_sa_id;
  70
  71         /**
  72          * The contained ike_sa_t object.
  73          */
  74         ike_sa_t *ike_sa;
  75 };
  76
  77 /**
  78  * Implementation of entry_t.destroy.
  79  */
  80 static status_t entry_destroy(entry_t *this)
  81 {
  82         /* also destroy IKE SA */
  83         this->ike_sa->destroy(this->ike_sa);
  84         this->ike_sa_id->destroy(this->ike_sa_id);
  85         free(this);
  86         return SUCCESS;
  87 }
  88
  89 /**
  90  * Creates a new entry for the ike_sa_t list.
  91  */
  92 static entry_t *entry_create(ike_sa_id_t *ike_sa_id)
  93 {
  94         entry_t *this = malloc_thing(entry_t);
  95
  96         this->waiting_threads = 0;
  97         pthread_cond_init(&(this->condvar), NULL);
  98
  99         /* we set checkout flag when we really give it out */
 100         this->checked_out = FALSE;
 101         this->driveout_new_threads = FALSE;
 102         this->driveout_waiting_threads = FALSE;
 103
 104         /* ike_sa_id is always cloned */
 105         this->ike_sa_id = ike_sa_id->clone(ike_sa_id);
 106
 107         /* create new ike_sa */
 108         this->ike_sa = ike_sa_create(ike_sa_id);
 109
 110         return this;
 111 }
 112
 113
 114 typedef struct private_ike_sa_manager_t private_ike_sa_manager_t;
 115
 116 /**
 117  * Additional private members of ike_sa_manager_t.
 118  */
 119 struct private_ike_sa_manager_t {
 120         /**
 121          * Public interface of ike_sa_manager_t.
 122          */
 123          ike_sa_manager_t public;
 124
 125          /**
 126           * Lock for exclusivly accessing the manager.
 127           */
 128          pthread_mutex_t mutex;
 129
 130          /**
 131           * Linked list with entries for the ike_sa_t objects.
 132           */
 133          linked_list_t *ike_sa_list;
 134
 135          /**
 136           * A randomizer, to get random SPIs for our side
 137           */
 138          randomizer_t *randomizer;
 139 };
 140
 141 /**
 142  * Implementation of private_ike_sa_manager_t.get_entry_by_id.
 143  */
 144 static status_t get_entry_by_id(private_ike_sa_manager_t *this, ike_sa_id_t *ike_sa_id, entry_t **entry)
 145 {
 146         linked_list_t *list = this->ike_sa_list;
 147         iterator_t *iterator;
 148         entry_t *current;
 149         status_t status;
 150
 151         /* create iterator over list of ike_sa's */
 152         iterator = list->create_iterator(list, TRUE);
 153
 154         /* default status */
 155         status = NOT_FOUND;
 156
 157         while (iterator->iterate(iterator, (void**)&current))
 158         {
 159                 if (current->ike_sa_id->equals(current->ike_sa_id, ike_sa_id))
 160                 {
 161                         DBG2(DBG_MGR,  "found entry by both SPIs");
 162                         *entry = current;
 163                         status = SUCCESS;
 164                         break;
 165                 }
 166                 if (ike_sa_id->get_responder_spi(ike_sa_id) == 0 ||
 167                         current->ike_sa_id->get_responder_spi(current->ike_sa_id) == 0)
 168                 {
 169                         /* seems to be a half ready ike_sa */
 170                         if ((current->ike_sa_id->get_initiator_spi(current->ike_sa_id) ==
 171                                                   ike_sa_id->get_initiator_spi(ike_sa_id)) &&
 172                                 (current->ike_sa_id->is_initiator(ike_sa_id) ==
 173                                                   ike_sa_id->is_initiator(current->ike_sa_id)))
 174                         {
 175                                 DBG2(DBG_MGR, "found entry by initiator SPI");
 176                                 *entry = current;
 177                                 status = SUCCESS;
 178                                 break;
 179                         }
 180                 }
 181         }
 182
 183         iterator->destroy(iterator);
 184         return status;
 185 }
 186
 187 /**
 188  * Implementation of private_ike_sa_manager_t.get_entry_by_sa.
 189  */
 190 static status_t get_entry_by_sa(private_ike_sa_manager_t *this, ike_sa_t *ike_sa, entry_t **entry)
 191 {
 192         linked_list_t *list = this->ike_sa_list;
 193         iterator_t *iterator;
 194         entry_t *current;
 195         status_t status;
 196
 197         iterator = list->create_iterator(list, TRUE);
 198
 199         /* default status */
 200         status = NOT_FOUND;
 201
 202         while (iterator->iterate(iterator, (void**)&current))
 203         {
 204                 /* only pointers are compared */
 205                 if (current->ike_sa == ike_sa)
 206                 {
 207                         DBG2(DBG_MGR, "found entry by pointer");
 208                         *entry = current;
 209                         status = SUCCESS;
 210                         break;
 211                 }
 212         }
 213         iterator->destroy(iterator);
 214
 215         return status;
 216 }
 217
 218 /**
 219  * Implementation of private_ike_sa_manager_s.delete_entry.
 220  */
 221 static status_t delete_entry(private_ike_sa_manager_t *this, entry_t *entry)
 222 {
 223         linked_list_t *list = this->ike_sa_list;
 224         iterator_t *iterator;
 225         entry_t *current;
 226         status_t status;
 227
 228         iterator = list->create_iterator(list, TRUE);
 229
 230         status = NOT_FOUND;
 231
 232         while (iterator->iterate(iterator, (void**)&current))
 233         {
 234                 if (current == entry)
 235                 {
 236                         /* mark it, so now new threads can get this entry */
 237                         entry->driveout_new_threads = TRUE;
 238                         /* wait until all workers have done their work */
 239                         while (entry->waiting_threads)
 240                         {
 241                                 /* wake up all */
 242                                 pthread_cond_broadcast(&(entry->condvar));
 243                                 /* they will wake us again when their work is done */
 244                                 pthread_cond_wait(&(entry->condvar), &(this->mutex));
 245                         }
 246
 247                         DBG2(DBG_MGR,  "found entry by pointer, deleting it");
 248                         iterator->remove(iterator);
 249                         entry_destroy(entry);
 250                         status = SUCCESS;
 251                         break;
 252                 }
 253         }
 254         iterator->destroy(iterator);
 255         return status;
 256 }
 257
 258 /**
 259  * Wait until no other thread is using an IKE_SA, return FALSE if entry not
 260  * acquireable
 261  */
 262 static bool wait_for_entry(private_ike_sa_manager_t *this, entry_t *entry)
 263 {
 264         if (entry->driveout_new_threads)
 265         {
 266                 /* we are not allowed to get this */
 267                 return FALSE;
 268         }
 269         while (entry->checked_out && !entry->driveout_waiting_threads)
 270         {
 271                 /* so wait until we can get it for us.
 272                 * we register us as waiting. */
 273                 entry->waiting_threads++;
 274                 pthread_cond_wait(&(entry->condvar), &(this->mutex));
 275                 entry->waiting_threads--;
 276         }
 277         /* hm, a deletion request forbids us to get this SA, get next one */
 278         if (entry->driveout_waiting_threads)
 279         {
 280                 /* we must signal here, others may be waiting on it, too */
 281                 pthread_cond_signal(&(entry->condvar));
 282                 return FALSE;
 283         }
 284         return TRUE;
 285 }
 286
 287 /**
 288  * Implementation of private_ike_sa_manager_t.get_next_spi.
 289  */
 290 static u_int64_t get_next_spi(private_ike_sa_manager_t *this)
 291 {
 292         u_int64_t spi;
 293
 294         this->randomizer->get_pseudo_random_bytes(this->randomizer, 8, (u_int8_t*)&spi);
 295
 296         return spi;
 297 }
 298
 299 /**
 300  * Implementation of of ike_sa_manager.checkout.
 301  */
 302 static ike_sa_t* checkout(private_ike_sa_manager_t *this, ike_sa_id_t *ike_sa_id)
 303 {
 304         bool responder_spi_set;
 305         bool initiator_spi_set;
 306         bool original_initiator;
 307         ike_sa_t *ike_sa = NULL;
 308
 309         DBG2(DBG_MGR, "checkout IKE_SA: %J", ike_sa_id);
 310
 311         DBG2(DBG_MGR,  "%d IKE_SAs in manager",
 312                  this->ike_sa_list->get_count(this->ike_sa_list));
 313
 314         /* each access is locked */
 315         pthread_mutex_lock(&(this->mutex));
 316
 317         responder_spi_set = ike_sa_id->get_responder_spi(ike_sa_id);
 318         initiator_spi_set = ike_sa_id->get_initiator_spi(ike_sa_id);
 319         original_initiator = ike_sa_id->is_initiator(ike_sa_id);
 320
 321         if ((initiator_spi_set && responder_spi_set) ||
 322                 ((initiator_spi_set && !responder_spi_set) && (original_initiator)))
 323         {
 324                 /* we SHOULD have an IKE_SA for these SPIs in the list,
 325                  * if not, we can't handle the request...
 326                  */
 327                 entry_t *entry;
 328                 /* look for the entry */
 329                 if (get_entry_by_id(this, ike_sa_id, &entry) == SUCCESS)
 330                 {
 331                         if (wait_for_entry(this, entry))
 332                         {
 333                                 DBG2(DBG_MGR, "IKE_SA successfully checked out");
 334                                 /* ok, this IKE_SA is finally ours */
 335                                 entry->checked_out = TRUE;
 336                                 ike_sa = entry->ike_sa;
 337                                 /* update responder SPI when it's not set */
 338                                 if (entry->ike_sa_id->get_responder_spi(entry->ike_sa_id) == 0)
 339                                 {
 340                                         ike_sa_id_t *ike_sa_ike_sa_id = ike_sa->get_id(ike_sa);
 341                                         u_int64_t spi = ike_sa_id->get_responder_spi(ike_sa_id);
 342
 343                                         ike_sa_ike_sa_id->set_responder_spi(ike_sa_ike_sa_id, spi);
 344                                         entry->ike_sa_id->set_responder_spi(entry->ike_sa_id, spi);
 345                                 }
 346                         }
 347                         else
 348                         {
 349                                 DBG2(DBG_MGR, "IKE_SA found, but not allowed to check it out");
 350                         }
 351                 }
 352                 else
 353                 {
 354                         DBG2(DBG_MGR, "IKE_SA not stored in list");
 355                         /* looks like there is no such IKE_SA, better luck next time... */
 356                 }
 357         }
 358         else if ((initiator_spi_set && !responder_spi_set) && (!original_initiator))
 359         {
 360                 /* an IKE_SA_INIT from an another endpoint,
 361                  * he is the initiator.
 362                  * For simplicity, we do NOT check for retransmitted
 363                  * IKE_SA_INIT-Requests here, so EVERY single IKE_SA_INIT-
 364                  * Request (even a retransmitted one) will result in a
 365                  * IKE_SA. This could be improved...
 366                  */
 367                 u_int64_t responder_spi;
 368                 entry_t *new_entry;
 369
 370                 /* set SPIs, we are the responder */
 371                 responder_spi = get_next_spi(this);
 372
 373                 /* we also set arguments spi, so its still valid */
 374                 ike_sa_id->set_responder_spi(ike_sa_id, responder_spi);
 375
 376                 /* create entry */
 377                 new_entry = entry_create(ike_sa_id);
 378
 379                 this->ike_sa_list->insert_last(this->ike_sa_list, new_entry);
 380
 381                 /* check ike_sa out */
 382                 DBG2(DBG_MGR,  "IKE_SA added to list of known IKE_SAs");
 383                 new_entry->checked_out = TRUE;
 384                 ike_sa = new_entry->ike_sa;
 385         }
 386         else if (!initiator_spi_set && !responder_spi_set)
 387         {
 388                 /* checkout of a new and unused IKE_SA, used for rekeying */
 389                 entry_t *new_entry;
 390
 391                 if (original_initiator)
 392                 {
 393                         ike_sa_id->set_initiator_spi(ike_sa_id, get_next_spi(this));
 394                 }
 395                 else
 396                 {
 397                         ike_sa_id->set_responder_spi(ike_sa_id, get_next_spi(this));
 398                 }
 399                 /* create entry */
 400                 new_entry = entry_create(ike_sa_id);
 401                 DBG2(DBG_MGR, "created IKE_SA: %J", ike_sa_id);
 402
 403                 this->ike_sa_list->insert_last(this->ike_sa_list, new_entry);
 404
 405                 /* check ike_sa out */
 406                 new_entry->checked_out = TRUE;
 407                 ike_sa = new_entry->ike_sa;
 408         }
 409         else
 410         {
 411                 /* responder set, initiator not: here is something seriously wrong! */
 412                 DBG2(DBG_MGR, "invalid IKE_SA SPIs");
 413         }
 414
 415         pthread_mutex_unlock(&(this->mutex));
 416
 417         charon->bus->set_sa(charon->bus, ike_sa);
 418         return ike_sa;
 419 }
 420
 421 /**
 422  * Implementation of of ike_sa_manager.checkout_by_id.
 423  */
 424 static ike_sa_t* checkout_by_peer(private_ike_sa_manager_t *this,
 425                                                                   host_t *my_host, host_t *other_host,
 426                                                                   identification_t *my_id,
 427                                                                   identification_t *other_id)
 428 {
 429         iterator_t *iterator;
 430         entry_t *entry;
 431         ike_sa_t *ike_sa = NULL;
 432
 433         pthread_mutex_lock(&(this->mutex));
 434
 435         iterator = this->ike_sa_list->create_iterator(this->ike_sa_list, TRUE);
 436         while (iterator->iterate(iterator, (void**)&entry))
 437         {
 438                 identification_t *found_my_id, *found_other_id;
 439                 host_t *found_my_host, *found_other_host;
 440                 int wc;
 441
 442                 if (!wait_for_entry(this, entry))
 443                 {
 444                         continue;
 445                 }
 446
 447                 if (entry->ike_sa->get_state(entry->ike_sa) == IKE_DELETING)
 448                 {
 449                         /* skip IKE_SA which are not useable */
 450                         continue;
 451                 }
 452
 453                 found_my_id = entry->ike_sa->get_my_id(entry->ike_sa);
 454                 found_other_id = entry->ike_sa->get_other_id(entry->ike_sa);
 455                 found_my_host = entry->ike_sa->get_my_host(entry->ike_sa);
 456                 found_other_host = entry->ike_sa->get_other_host(entry->ike_sa);
 457
 458                 if (found_my_id->get_type(found_my_id) == ID_ANY &&
 459                         found_other_id->get_type(found_other_id) == ID_ANY)
 460                 {
 461                         /* IKE_SA has no IDs yet, so we can't use it */
 462                         continue;
 463                 }
 464
 465                 /* compare ID and hosts. Supplied ID may contain wildcards, and IP
 466                  * may be %any. */
 467                 if ((found_my_host->is_anyaddr(found_my_host) ||
 468                          my_host->ip_equals(my_host, found_my_host)) &&
 469                         (found_other_host->is_anyaddr(found_other_host) ||
 470                          other_host->ip_equals(other_host, found_other_host)) &&
 471                         found_my_id->matches(found_my_id, my_id, &wc) &&
 472                         found_other_id->matches(found_other_id, other_id, &wc))
 473                 {
 474                         /* looks good, we take this one */
 475                         DBG2(DBG_MGR, "found an existing IKE_SA for %H[%D]...%H[%D]",
 476                                  my_host, other_host, my_id, other_id);
 477                         entry->checked_out = TRUE;
 478                         ike_sa = entry->ike_sa;
 479                 }
 480         }
 481         iterator->destroy(iterator);
 482
 483         if (!ike_sa)
 484         {
 485                 u_int64_t initiator_spi;
 486                 entry_t *new_entry;
 487                 ike_sa_id_t *new_ike_sa_id;
 488
 489                 initiator_spi = get_next_spi(this);
 490                 new_ike_sa_id = ike_sa_id_create(0, 0, TRUE);
 491                 new_ike_sa_id->set_initiator_spi(new_ike_sa_id, initiator_spi);
 492
 493                 /* create entry */
 494                 new_entry = entry_create(new_ike_sa_id);
 495                 DBG2(DBG_MGR, "created IKE_SA: %J", new_ike_sa_id);
 496                 new_ike_sa_id->destroy(new_ike_sa_id);
 497
 498                 this->ike_sa_list->insert_last(this->ike_sa_list, new_entry);
 499
 500                 /* check ike_sa out */
 501                 DBG2(DBG_MGR, "new IKE_SA created for IDs [%D]...[%D]", my_id, other_id);
 502                 new_entry->checked_out = TRUE;
 503                 ike_sa = new_entry->ike_sa;
 504         }
 505         pthread_mutex_unlock(&(this->mutex));
 506         charon->bus->set_sa(charon->bus, ike_sa);
 507         return ike_sa;
 508 }
 509
 510 /**
 511  * Implementation of of ike_sa_manager.checkout_by_id.
 512  */
 513 static ike_sa_t* checkout_by_id(private_ike_sa_manager_t *this, u_int32_t id,
 514                                                                 bool child)
 515 {
 516         iterator_t *iterator, *children;
 517         entry_t *entry;
 518         ike_sa_t *ike_sa = NULL;
 519         child_sa_t *child_sa;
 520
 521         pthread_mutex_lock(&(this->mutex));
 522
 523         iterator = this->ike_sa_list->create_iterator(this->ike_sa_list, TRUE);
 524         while (iterator->iterate(iterator, (void**)&entry))
 525         {
 526                 if (wait_for_entry(this, entry))
 527                 {
 528                         /* look for a child with such a reqid ... */
 529                         if (child)
 530                         {
 531                                 children = entry->ike_sa->create_child_sa_iterator(entry->ike_sa);
 532                                 while (children->iterate(children, (void**)&child_sa))
 533                                 {
 534                                         if (child_sa->get_reqid(child_sa) == id)
 535                                         {
 536                                                 ike_sa = entry->ike_sa;
 537                                                 break;
 538                                         }
 539                                 }
 540                                 children->destroy(children);
 541                         }
 542                         else /* ... or for a IKE_SA with such a unique id */
 543                         {
 544                                 if (entry->ike_sa->get_unique_id(entry->ike_sa) == id)
 545                                 {
 546                                         ike_sa = entry->ike_sa;
 547                                 }
 548                         }
 549                         /* got one, return */
 550                         if (ike_sa)
 551                         {
 552                                 entry->checked_out = TRUE;
 553                                 break;
 554                         }
 555                 }
 556         }
 557         iterator->destroy(iterator);
 558         pthread_mutex_unlock(&(this->mutex));
 559
 560         charon->bus->set_sa(charon->bus, ike_sa);
 561         return ike_sa;
 562 }
 563
 564 /**
 565  * Implementation of of ike_sa_manager.checkout_by_name.
 566  */
 567 static ike_sa_t* checkout_by_name(private_ike_sa_manager_t *this, char *name,
 568                                                                   bool child)
 569 {
 570         iterator_t *iterator, *children;
 571         entry_t *entry;
 572         ike_sa_t *ike_sa = NULL;
 573         child_sa_t *child_sa;
 574
 575         pthread_mutex_lock(&(this->mutex));
 576
 577         iterator = this->ike_sa_list->create_iterator(this->ike_sa_list, TRUE);
 578         while (iterator->iterate(iterator, (void**)&entry))
 579         {
 580                 if (wait_for_entry(this, entry))
 581                 {
 582                         /* look for a child with such a policy name ... */
 583                         if (child)
 584                         {
 585                                 children = entry->ike_sa->create_child_sa_iterator(entry->ike_sa);
 586                                 while (children->iterate(children, (void**)&child_sa))
 587                                 {
 588                                         if (streq(child_sa->get_name(child_sa), name))
 589                                         {
 590                                                 ike_sa = entry->ike_sa;
 591                                                 break;
 592                                         }
 593                                 }
 594                                 children->destroy(children);
 595                         }
 596                         else /* ... or for a IKE_SA with such a connection name */
 597                         {
 598                                 if (streq(entry->ike_sa->get_name(entry->ike_sa), name))
 599                                 {
 600                                         ike_sa = entry->ike_sa;
 601                                 }
 602                         }
 603                         /* got one, return */
 604                         if (ike_sa)
 605                         {
 606                                 entry->checked_out = TRUE;
 607                                 break;
 608                         }
 609                 }
 610         }
 611         iterator->destroy(iterator);
 612         pthread_mutex_unlock(&(this->mutex));
 613
 614         charon->bus->set_sa(charon->bus, ike_sa);
 615         return ike_sa;
 616 }
 617
 618 /**
 619  * Iterator hook for iterate, gets ike_sas instead of entries
 620  */
 621 static bool iterator_hook(private_ike_sa_manager_t* this, entry_t *in,
 622                                                   ike_sa_t **out)
 623 {
 624         /* check out entry */
 625         if (wait_for_entry(this, in))
 626         {
 627                 *out = in->ike_sa;
 628                 return TRUE;
 629         }
 630         return FALSE;
 631 }
 632
 633 /**
 634  * Implementation of ike_sa_manager_t.create_iterator.
 635  */
 636 static iterator_t *create_iterator(private_ike_sa_manager_t* this)
 637 {
 638         iterator_t *iterator = this->ike_sa_list->create_iterator_locked(
 639                                                                                         this->ike_sa_list, &this->mutex);
 640         /* register hook to iterator over ike_sas, not entries */
 641         iterator->set_iterator_hook(iterator, (iterator_hook_t*)iterator_hook, this);
 642         return iterator;
 643 }
 644
 645 /**
 646  * Implementation of ike_sa_manager_t.checkin.
 647  */
 648 static status_t checkin(private_ike_sa_manager_t *this, ike_sa_t *ike_sa)
 649 {
 650         /* to check the SA back in, we look for the pointer of the ike_sa
 651          * in all entries.
 652          * We can't search by SPI's since the MAY have changed (e.g. on reception
 653          * of a IKE_SA_INIT response). Updating of the SPI MAY be necessary...
 654          */
 655         status_t retval;
 656         entry_t *entry;
 657         ike_sa_id_t *ike_sa_id;
 658
 659         ike_sa_id = ike_sa->get_id(ike_sa);
 660
 661         DBG2(DBG_MGR, "checkin IKE_SA: %J", ike_sa_id);
 662
 663         pthread_mutex_lock(&(this->mutex));
 664
 665         /* look for the entry */
 666         if (get_entry_by_sa(this, ike_sa, &entry) == SUCCESS)
 667         {
 668                 /* ike_sa_id must be updated */
 669                 entry->ike_sa_id->replace_values(entry->ike_sa_id, ike_sa->get_id(ike_sa));
 670                 /* signal waiting threads */
 671                 entry->checked_out = FALSE;
 672                 DBG2(DBG_MGR, "check-in of IKE_SA successful.");
 673                 pthread_cond_signal(&(entry->condvar));
 674                 retval = SUCCESS;
 675         }
 676         else
 677         {
 678                 DBG2(DBG_MGR, "tried to check in nonexisting IKE_SA");
 679                 /* this SA is no more, this REALLY should not happen */
 680                 retval = NOT_FOUND;
 681         }
 682
 683         DBG2(DBG_MGR, "%d IKE_SAs in manager now",
 684                  this->ike_sa_list->get_count(this->ike_sa_list));
 685         pthread_mutex_unlock(&(this->mutex));
 686
 687         charon->bus->set_sa(charon->bus, NULL);
 688         return retval;
 689 }
 690
 691
 692 /**
 693  * Implementation of ike_sa_manager_t.checkin_and_destroy.
 694  */
 695 static status_t checkin_and_destroy(private_ike_sa_manager_t *this, ike_sa_t *ike_sa)
 696 {
 697         /* deletion is a bit complex, we must garant that no thread is waiting for
 698          * this SA.
 699          * We take this SA from the list, and start signaling while threads
 700          * are in the condvar.
 701          */
 702         entry_t *entry;
 703         status_t retval;
 704         ike_sa_id_t *ike_sa_id;
 705
 706         ike_sa_id = ike_sa->get_id(ike_sa);
 707         DBG2(DBG_MGR, "checkin and destroy IKE_SA: %J", ike_sa_id);
 708
 709         pthread_mutex_lock(&(this->mutex));
 710
 711         if (get_entry_by_sa(this, ike_sa, &entry) == SUCCESS)
 712         {
 713                 /* drive out waiting threads, as we are in hurry */
 714                 entry->driveout_waiting_threads = TRUE;
 715
 716                 delete_entry(this, entry);
 717
 718                 DBG2(DBG_MGR, "check-in and destroy of IKE_SA successful");
 719                 retval = SUCCESS;
 720         }
 721         else
 722         {
 723                 DBG2(DBG_MGR, "tried to check-in and delete nonexisting IKE_SA");
 724                 retval = NOT_FOUND;
 725         }
 726
 727         pthread_mutex_unlock(&(this->mutex));
 728         charon->bus->set_sa(charon->bus, ike_sa);
 729         return retval;
 730 }
 731
 732 /**
 733  * Implementation of ike_sa_manager_t.get_half_open_count.
 734  */
 735 static int get_half_open_count(private_ike_sa_manager_t *this, host_t *ip)
 736 {
 737         iterator_t *iterator;
 738         entry_t *entry;
 739         int count = 0;
 740
 741         pthread_mutex_lock(&(this->mutex));
 742         iterator = this->ike_sa_list->create_iterator(this->ike_sa_list, TRUE);
 743         while (iterator->iterate(iterator, (void**)&entry))
 744         {
 745                 /* we check if we have a responder CONNECTING IKE_SA without checkout */
 746                 if (!entry->ike_sa_id->is_initiator(entry->ike_sa_id) &&
 747                         entry->ike_sa->get_state(entry->ike_sa) == IKE_CONNECTING)
 748                 {
 749                         /* if we have a host, we have wait until no other uses the IKE_SA */
 750                         if (ip)
 751                         {
 752                                 if (wait_for_entry(this, entry) && ip->ip_equals(ip,
 753                                                                 entry->ike_sa->get_other_host(entry->ike_sa)))
 754                                 {
 755                                         count++;
 756                                 }
 757                         }
 758                         else
 759                         {
 760                                 count++;
 761                         }
 762                 }
 763         }
 764         iterator->destroy(iterator);
 765
 766         pthread_mutex_unlock(&(this->mutex));
 767         return count;
 768 }
 769
 770 /**
 771  * Implementation of ike_sa_manager_t.destroy.
 772  */
 773 static void destroy(private_ike_sa_manager_t *this)
 774 {
 775         /* destroy all list entries */
 776         linked_list_t *list = this->ike_sa_list;
 777         iterator_t *iterator;
 778         entry_t *entry;
 779
 780         pthread_mutex_lock(&(this->mutex));
 781         DBG2(DBG_MGR, "going to destroy IKE_SA manager and all managed IKE_SA's");
 782         /* Step 1: drive out all waiting threads  */
 783         DBG2(DBG_MGR, "set driveout flags for all stored IKE_SA's");
 784         iterator = list->create_iterator(list, TRUE);
 785         while (iterator->iterate(iterator, (void**)&entry))
 786         {
 787                 /* do not accept new threads, drive out waiting threads */
 788                 entry->driveout_new_threads = TRUE;
 789                 entry->driveout_waiting_threads = TRUE;
 790         }
 791         DBG2(DBG_MGR, "wait for all threads to leave IKE_SA's");
 792         /* Step 2: wait until all are gone */
 793         iterator->reset(iterator);
 794         while (iterator->iterate(iterator, (void**)&entry))
 795         {
 796                 while (entry->waiting_threads)
 797                 {
 798                         /* wake up all */
 799                         pthread_cond_broadcast(&(entry->condvar));
 800                         /* go sleeping until they are gone */
 801                         pthread_cond_wait(&(entry->condvar), &(this->mutex));
 802                 }
 803         }
 804         DBG2(DBG_MGR, "delete all IKE_SA's");
 805         /* Step 3: initiate deletion of all IKE_SAs */
 806         iterator->reset(iterator);
 807         while (iterator->iterate(iterator, (void**)&entry))
 808         {
 809                 entry->ike_sa->delete(entry->ike_sa);
 810         }
 811         iterator->destroy(iterator);
 812
 813         DBG2(DBG_MGR, "destroy all entries");
 814         /* Step 4: destroy all entries */
 815         list->destroy_function(list, (void*)entry_destroy);
 816         pthread_mutex_unlock(&(this->mutex));
 817
 818         this->randomizer->destroy(this->randomizer);
 819
 820         free(this);
 821 }
 822
 823 /*
 824  * Described in header.
 825  */
 826 ike_sa_manager_t *ike_sa_manager_create()
 827 {
 828         private_ike_sa_manager_t *this = malloc_thing(private_ike_sa_manager_t);
 829
 830         /* assign public functions */
 831         this->public.destroy = (void(*)(ike_sa_manager_t*))destroy;
 832         this->public.checkout = (ike_sa_t*(*)(ike_sa_manager_t*, ike_sa_id_t*))checkout;
 833         this->public.checkout_by_peer = (ike_sa_t*(*)(ike_sa_manager_t*,host_t*,host_t*,identification_t*,identification_t*))checkout_by_peer;
 834         this->public.checkout_by_id = (ike_sa_t*(*)(ike_sa_manager_t*,u_int32_t,bool))checkout_by_id;
 835         this->public.checkout_by_name = (ike_sa_t*(*)(ike_sa_manager_t*,char*,bool))checkout_by_name;
 836         this->public.create_iterator = (iterator_t*(*)(ike_sa_manager_t*))create_iterator;
 837         this->public.checkin = (status_t(*)(ike_sa_manager_t*,ike_sa_t*))checkin;
 838         this->public.checkin_and_destroy = (status_t(*)(ike_sa_manager_t*,ike_sa_t*))checkin_and_destroy;
 839         this->public.get_half_open_count = (int(*)(ike_sa_manager_t*,host_t*))get_half_open_count;
 840
 841         /* initialize private variables */
 842         this->ike_sa_list = linked_list_create();
 843         pthread_mutex_init(&this->mutex, NULL);
 844         this->randomizer = randomizer_create();
 845
 846         return &this->public;
 847 }