child-sa: Replace reqid based marks by "unique" marks
[strongswan.git] / src / libcharon / sa / ikev1 / task_manager_v1.c
1 /*
2 * Copyright (C) 2007-2014 Tobias Brunner
3 * Copyright (C) 2007-2011 Martin Willi
4 * Hochschule fuer Technik Rapperswil
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 */
16
17 #include "task_manager_v1.h"
18
19 #include <math.h>
20
21 #include <daemon.h>
22 #include <sa/ikev1/tasks/main_mode.h>
23 #include <sa/ikev1/tasks/aggressive_mode.h>
24 #include <sa/ikev1/tasks/quick_mode.h>
25 #include <sa/ikev1/tasks/quick_delete.h>
26 #include <sa/ikev1/tasks/xauth.h>
27 #include <sa/ikev1/tasks/mode_config.h>
28 #include <sa/ikev1/tasks/informational.h>
29 #include <sa/ikev1/tasks/isakmp_natd.h>
30 #include <sa/ikev1/tasks/isakmp_vendor.h>
31 #include <sa/ikev1/tasks/isakmp_cert_pre.h>
32 #include <sa/ikev1/tasks/isakmp_cert_post.h>
33 #include <sa/ikev1/tasks/isakmp_delete.h>
34 #include <sa/ikev1/tasks/isakmp_dpd.h>
35
36 #include <processing/jobs/retransmit_job.h>
37 #include <processing/jobs/delete_ike_sa_job.h>
38 #include <processing/jobs/dpd_timeout_job.h>
39 #include <processing/jobs/process_message_job.h>
40
41 #include <collections/array.h>
42
43 /**
44 * Number of old messages hashes we keep for retransmission.
45 *
46 * In Main Mode, we must ignore messages from a previous message pair if
47 * we already continued to the next. Otherwise a late retransmission
48 * could be considered as a reply to the newer request.
49 */
50 #define MAX_OLD_HASHES 2
51
52 /**
53 * First sequence number of responding packets.
54 *
55 * To distinguish retransmission jobs for initiating and responding packets,
56 * we split up the sequence counter and use the upper half for responding.
57 */
58 #define RESPONDING_SEQ INT_MAX
59
60 typedef struct exchange_t exchange_t;
61
62 /**
63 * An exchange in the air, used do detect and handle retransmission
64 */
65 struct exchange_t {
66
67 /**
68 * Message ID used for this transaction
69 */
70 u_int32_t mid;
71
72 /**
73 * generated packet for retransmission
74 */
75 packet_t *packet;
76 };
77
78 typedef struct private_task_manager_t private_task_manager_t;
79
80 /**
81 * private data of the task manager
82 */
83 struct private_task_manager_t {
84
85 /**
86 * public functions
87 */
88 task_manager_v1_t public;
89
90 /**
91 * associated IKE_SA we are serving
92 */
93 ike_sa_t *ike_sa;
94
95 /**
96 * RNG to create message IDs
97 */
98 rng_t *rng;
99
100 /**
101 * Exchange we are currently handling as responder
102 */
103 struct {
104 /**
105 * Message ID of the last response
106 */
107 u_int32_t mid;
108
109 /**
110 * Hash of a previously received message
111 */
112 u_int32_t hash;
113
114 /**
115 * packet(s) for retransmission
116 */
117 array_t *packets;
118
119 /**
120 * Sequence number of the last sent message
121 */
122 u_int32_t seqnr;
123
124 /**
125 * how many times we have retransmitted so far
126 */
127 u_int retransmitted;
128
129 } responding;
130
131 /**
132 * Exchange we are currently handling as initiator
133 */
134 struct {
135 /**
136 * Message ID of the exchange
137 */
138 u_int32_t mid;
139
140 /**
141 * Hashes of old responses we can ignore
142 */
143 u_int32_t old_hashes[MAX_OLD_HASHES];
144
145 /**
146 * Position in old hash array
147 */
148 int old_hash_pos;
149
150 /**
151 * Sequence number of the last sent message
152 */
153 u_int32_t seqnr;
154
155 /**
156 * how many times we have retransmitted so far
157 */
158 u_int retransmitted;
159
160 /**
161 * packet(s) for retransmission
162 */
163 array_t *packets;
164
165 /**
166 * type of the initiated exchange
167 */
168 exchange_type_t type;
169
170 } initiating;
171
172 /**
173 * Message we are currently defragmenting, if any (only one at a time)
174 */
175 message_t *defrag;
176
177 /**
178 * List of queued tasks not yet in action
179 */
180 linked_list_t *queued_tasks;
181
182 /**
183 * List of active tasks, initiated by ourselves
184 */
185 linked_list_t *active_tasks;
186
187 /**
188 * List of tasks initiated by peer
189 */
190 linked_list_t *passive_tasks;
191
192 /**
193 * Queued messages not yet ready to process
194 */
195 message_t *queued;
196
197 /**
198 * Number of times we retransmit messages before giving up
199 */
200 u_int retransmit_tries;
201
202 /**
203 * Retransmission timeout
204 */
205 double retransmit_timeout;
206
207 /**
208 * Base to calculate retransmission timeout
209 */
210 double retransmit_base;
211
212 /**
213 * Sequence number for sending DPD requests
214 */
215 u_int32_t dpd_send;
216
217 /**
218 * Sequence number for received DPD requests
219 */
220 u_int32_t dpd_recv;
221 };
222
223 /**
224 * Reset retransmission packet list
225 */
226 static void clear_packets(array_t *array)
227 {
228 packet_t *packet;
229
230 while (array_remove(array, ARRAY_TAIL, &packet))
231 {
232 packet->destroy(packet);
233 }
234 }
235
236 METHOD(task_manager_t, flush_queue, void,
237 private_task_manager_t *this, task_queue_t queue)
238 {
239 linked_list_t *list;
240 task_t *task;
241
242 if (this->queued)
243 {
244 this->queued->destroy(this->queued);
245 this->queued = NULL;
246 }
247 switch (queue)
248 {
249 case TASK_QUEUE_ACTIVE:
250 list = this->active_tasks;
251 /* cancel pending retransmits */
252 this->initiating.type = EXCHANGE_TYPE_UNDEFINED;
253 clear_packets(this->initiating.packets);
254 break;
255 case TASK_QUEUE_PASSIVE:
256 list = this->passive_tasks;
257 break;
258 case TASK_QUEUE_QUEUED:
259 list = this->queued_tasks;
260 break;
261 default:
262 return;
263 }
264 while (list->remove_last(list, (void**)&task) == SUCCESS)
265 {
266 task->destroy(task);
267 }
268 }
269
270 METHOD(task_manager_t, flush, void,
271 private_task_manager_t *this)
272 {
273 flush_queue(this, TASK_QUEUE_QUEUED);
274 flush_queue(this, TASK_QUEUE_PASSIVE);
275 flush_queue(this, TASK_QUEUE_ACTIVE);
276 }
277
278 /**
279 * move a task of a specific type from the queue to the active list
280 */
281 static bool activate_task(private_task_manager_t *this, task_type_t type)
282 {
283 enumerator_t *enumerator;
284 task_t *task;
285 bool found = FALSE;
286
287 enumerator = this->queued_tasks->create_enumerator(this->queued_tasks);
288 while (enumerator->enumerate(enumerator, (void**)&task))
289 {
290 if (task->get_type(task) == type)
291 {
292 DBG2(DBG_IKE, " activating %N task", task_type_names, type);
293 this->queued_tasks->remove_at(this->queued_tasks, enumerator);
294 this->active_tasks->insert_last(this->active_tasks, task);
295 found = TRUE;
296 break;
297 }
298 }
299 enumerator->destroy(enumerator);
300 return found;
301 }
302
303 /**
304 * Send packets in the given array (they get cloned)
305 */
306 static void send_packets(private_task_manager_t *this, array_t *packets)
307 {
308 enumerator_t *enumerator;
309 packet_t *packet;
310
311 enumerator = array_create_enumerator(packets);
312 while (enumerator->enumerate(enumerator, &packet))
313 {
314 charon->sender->send(charon->sender, packet->clone(packet));
315 }
316 enumerator->destroy(enumerator);
317 }
318
319 /**
320 * Generates the given message and stores packet(s) in the given array
321 */
322 static bool generate_message(private_task_manager_t *this, message_t *message,
323 array_t **packets)
324 {
325 enumerator_t *fragments;
326 packet_t *fragment;
327
328 if (this->ike_sa->generate_message_fragmented(this->ike_sa, message,
329 &fragments) != SUCCESS)
330 {
331 return FALSE;
332 }
333 while (fragments->enumerate(fragments, &fragment))
334 {
335 array_insert_create(packets, ARRAY_TAIL, fragment);
336 }
337 fragments->destroy(fragments);
338 return TRUE;
339 }
340
341 /**
342 * Retransmit a packet (or its fragments)
343 */
344 static status_t retransmit_packet(private_task_manager_t *this, u_int32_t seqnr,
345 u_int mid, u_int retransmitted, array_t *packets)
346 {
347 packet_t *packet;
348 u_int32_t t;
349
350 array_get(packets, 0, &packet);
351 if (retransmitted > this->retransmit_tries)
352 {
353 DBG1(DBG_IKE, "giving up after %u retransmits", retransmitted - 1);
354 charon->bus->alert(charon->bus, ALERT_RETRANSMIT_SEND_TIMEOUT, packet);
355 return DESTROY_ME;
356 }
357 t = (u_int32_t)(this->retransmit_timeout * 1000.0 *
358 pow(this->retransmit_base, retransmitted));
359 if (retransmitted)
360 {
361 DBG1(DBG_IKE, "sending retransmit %u of %s message ID %u, seq %u",
362 retransmitted, seqnr < RESPONDING_SEQ ? "request" : "response",
363 mid, seqnr < RESPONDING_SEQ ? seqnr : seqnr - RESPONDING_SEQ);
364 charon->bus->alert(charon->bus, ALERT_RETRANSMIT_SEND, packet);
365 }
366 send_packets(this, packets);
367 lib->scheduler->schedule_job_ms(lib->scheduler, (job_t*)
368 retransmit_job_create(seqnr, this->ike_sa->get_id(this->ike_sa)), t);
369 return NEED_MORE;
370 }
371
372 METHOD(task_manager_t, retransmit, status_t,
373 private_task_manager_t *this, u_int32_t seqnr)
374 {
375 status_t status = SUCCESS;
376
377 if (seqnr == this->initiating.seqnr &&
378 array_count(this->initiating.packets))
379 {
380 status = retransmit_packet(this, seqnr, this->initiating.mid,
381 this->initiating.retransmitted, this->initiating.packets);
382 if (status == NEED_MORE)
383 {
384 this->initiating.retransmitted++;
385 status = SUCCESS;
386 }
387 }
388 if (seqnr == this->responding.seqnr &&
389 array_count(this->responding.packets))
390 {
391 status = retransmit_packet(this, seqnr, this->responding.mid,
392 this->responding.retransmitted, this->responding.packets);
393 if (status == NEED_MORE)
394 {
395 this->responding.retransmitted++;
396 status = SUCCESS;
397 }
398 }
399 return status;
400 }
401
402 /**
403 * Check if we have to wait for a mode config before starting a quick mode
404 */
405 static bool mode_config_expected(private_task_manager_t *this)
406 {
407 enumerator_t *enumerator;
408 peer_cfg_t *peer_cfg;
409 char *pool;
410 bool local;
411 host_t *host;
412
413 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
414 if (peer_cfg)
415 {
416 if (peer_cfg->use_pull_mode(peer_cfg))
417 {
418 enumerator = peer_cfg->create_pool_enumerator(peer_cfg);
419 if (!enumerator->enumerate(enumerator, &pool))
420 { /* no pool configured */
421 enumerator->destroy(enumerator);
422 return FALSE;
423 }
424 enumerator->destroy(enumerator);
425
426 local = FALSE;
427 }
428 else
429 {
430 enumerator = peer_cfg->create_virtual_ip_enumerator(peer_cfg);
431 if (!enumerator->enumerate(enumerator, &host))
432 { /* not requesting a vip */
433 enumerator->destroy(enumerator);
434 return FALSE;
435 }
436 enumerator->destroy(enumerator);
437
438 local = TRUE;
439 }
440 enumerator = this->ike_sa->create_virtual_ip_enumerator(this->ike_sa,
441 local);
442 if (!enumerator->enumerate(enumerator, &host))
443 { /* expecting a VIP exchange, but no VIP assigned yet */
444 enumerator->destroy(enumerator);
445 return TRUE;
446 }
447 enumerator->destroy(enumerator);
448 }
449 return FALSE;
450 }
451
452 METHOD(task_manager_t, initiate, status_t,
453 private_task_manager_t *this)
454 {
455 enumerator_t *enumerator;
456 task_t *task;
457 message_t *message;
458 host_t *me, *other;
459 exchange_type_t exchange = EXCHANGE_TYPE_UNDEFINED;
460 bool new_mid = FALSE, expect_response = FALSE, cancelled = FALSE, keep = FALSE;
461
462 if (this->initiating.type != EXCHANGE_TYPE_UNDEFINED &&
463 this->initiating.type != INFORMATIONAL_V1)
464 {
465 DBG2(DBG_IKE, "delaying task initiation, %N exchange in progress",
466 exchange_type_names, this->initiating.type);
467 /* do not initiate if we already have a message in the air */
468 return SUCCESS;
469 }
470
471 if (this->active_tasks->get_count(this->active_tasks) == 0)
472 {
473 DBG2(DBG_IKE, "activating new tasks");
474 switch (this->ike_sa->get_state(this->ike_sa))
475 {
476 case IKE_CREATED:
477 activate_task(this, TASK_ISAKMP_VENDOR);
478 activate_task(this, TASK_ISAKMP_CERT_PRE);
479 if (activate_task(this, TASK_MAIN_MODE))
480 {
481 exchange = ID_PROT;
482 }
483 else if (activate_task(this, TASK_AGGRESSIVE_MODE))
484 {
485 exchange = AGGRESSIVE;
486 }
487 activate_task(this, TASK_ISAKMP_CERT_POST);
488 activate_task(this, TASK_ISAKMP_NATD);
489 break;
490 case IKE_CONNECTING:
491 if (activate_task(this, TASK_ISAKMP_DELETE))
492 {
493 exchange = INFORMATIONAL_V1;
494 new_mid = TRUE;
495 break;
496 }
497 if (activate_task(this, TASK_XAUTH))
498 {
499 exchange = TRANSACTION;
500 new_mid = TRUE;
501 break;
502 }
503 if (activate_task(this, TASK_INFORMATIONAL))
504 {
505 exchange = INFORMATIONAL_V1;
506 new_mid = TRUE;
507 break;
508 }
509 break;
510 case IKE_ESTABLISHED:
511 if (activate_task(this, TASK_MODE_CONFIG))
512 {
513 exchange = TRANSACTION;
514 new_mid = TRUE;
515 break;
516 }
517 if (!mode_config_expected(this) &&
518 activate_task(this, TASK_QUICK_MODE))
519 {
520 exchange = QUICK_MODE;
521 new_mid = TRUE;
522 break;
523 }
524 if (activate_task(this, TASK_INFORMATIONAL))
525 {
526 exchange = INFORMATIONAL_V1;
527 new_mid = TRUE;
528 break;
529 }
530 if (activate_task(this, TASK_QUICK_DELETE))
531 {
532 exchange = INFORMATIONAL_V1;
533 new_mid = TRUE;
534 break;
535 }
536 if (activate_task(this, TASK_ISAKMP_DELETE))
537 {
538 exchange = INFORMATIONAL_V1;
539 new_mid = TRUE;
540 break;
541 }
542 if (activate_task(this, TASK_ISAKMP_DPD))
543 {
544 exchange = INFORMATIONAL_V1;
545 new_mid = TRUE;
546 break;
547 }
548 break;
549 default:
550 break;
551 }
552 }
553 else
554 {
555 DBG2(DBG_IKE, "reinitiating already active tasks");
556 enumerator = this->active_tasks->create_enumerator(this->active_tasks);
557 while (enumerator->enumerate(enumerator, (void**)&task))
558 {
559 DBG2(DBG_IKE, " %N task", task_type_names, task->get_type(task));
560 switch (task->get_type(task))
561 {
562 case TASK_MAIN_MODE:
563 exchange = ID_PROT;
564 break;
565 case TASK_AGGRESSIVE_MODE:
566 exchange = AGGRESSIVE;
567 break;
568 case TASK_QUICK_MODE:
569 exchange = QUICK_MODE;
570 break;
571 case TASK_XAUTH:
572 exchange = TRANSACTION;
573 new_mid = TRUE;
574 break;
575 default:
576 continue;
577 }
578 break;
579 }
580 enumerator->destroy(enumerator);
581 }
582
583 if (exchange == EXCHANGE_TYPE_UNDEFINED)
584 {
585 DBG2(DBG_IKE, "nothing to initiate");
586 /* nothing to do yet... */
587 return SUCCESS;
588 }
589
590 me = this->ike_sa->get_my_host(this->ike_sa);
591 other = this->ike_sa->get_other_host(this->ike_sa);
592
593 if (new_mid)
594 {
595 if (!this->rng->get_bytes(this->rng, sizeof(this->initiating.mid),
596 (void*)&this->initiating.mid))
597 {
598 DBG1(DBG_IKE, "failed to allocate message ID, destroying IKE_SA");
599 flush(this);
600 return DESTROY_ME;
601 }
602 }
603 message = message_create(IKEV1_MAJOR_VERSION, IKEV1_MINOR_VERSION);
604 message->set_message_id(message, this->initiating.mid);
605 message->set_source(message, me->clone(me));
606 message->set_destination(message, other->clone(other));
607 message->set_exchange_type(message, exchange);
608 this->initiating.type = exchange;
609 this->initiating.retransmitted = 0;
610
611 enumerator = this->active_tasks->create_enumerator(this->active_tasks);
612 while (enumerator->enumerate(enumerator, (void*)&task))
613 {
614 switch (task->build(task, message))
615 {
616 case SUCCESS:
617 /* task completed, remove it */
618 this->active_tasks->remove_at(this->active_tasks, enumerator);
619 if (task->get_type(task) == TASK_AGGRESSIVE_MODE ||
620 task->get_type(task) == TASK_QUICK_MODE)
621 { /* last message of three message exchange */
622 keep = TRUE;
623 }
624 task->destroy(task);
625 continue;
626 case NEED_MORE:
627 expect_response = TRUE;
628 /* processed, but task needs another exchange */
629 continue;
630 case ALREADY_DONE:
631 cancelled = TRUE;
632 break;
633 case FAILED:
634 default:
635 if (this->ike_sa->get_state(this->ike_sa) != IKE_CONNECTING)
636 {
637 charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
638 }
639 /* FALL */
640 case DESTROY_ME:
641 /* critical failure, destroy IKE_SA */
642 enumerator->destroy(enumerator);
643 message->destroy(message);
644 flush(this);
645 return DESTROY_ME;
646 }
647 break;
648 }
649 enumerator->destroy(enumerator);
650
651 if (this->active_tasks->get_count(this->active_tasks) == 0 &&
652 (exchange == QUICK_MODE || exchange == AGGRESSIVE))
653 { /* tasks completed, no exchange active anymore */
654 this->initiating.type = EXCHANGE_TYPE_UNDEFINED;
655 }
656 if (cancelled)
657 {
658 message->destroy(message);
659 return initiate(this);
660 }
661
662 clear_packets(this->initiating.packets);
663 if (!generate_message(this, message, &this->initiating.packets))
664 {
665 /* message generation failed. There is nothing more to do than to
666 * close the SA */
667 message->destroy(message);
668 flush(this);
669 charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
670 return DESTROY_ME;
671 }
672
673 this->initiating.seqnr++;
674 if (expect_response)
675 {
676 message->destroy(message);
677 return retransmit(this, this->initiating.seqnr);
678 }
679 if (keep)
680 { /* keep the packet for retransmission, the responder might request it */
681 send_packets(this, this->initiating.packets);
682 }
683 else
684 {
685 send_packets(this, this->initiating.packets);
686 clear_packets(this->initiating.packets);
687 }
688 message->destroy(message);
689
690 if (exchange == INFORMATIONAL_V1)
691 {
692 switch (this->ike_sa->get_state(this->ike_sa))
693 {
694 case IKE_CONNECTING:
695 /* close after sending an INFORMATIONAL when unestablished */
696 return FAILED;
697 case IKE_DELETING:
698 /* close after sending a DELETE */
699 return DESTROY_ME;
700 default:
701 break;
702 }
703 }
704 return initiate(this);
705 }
706
707 /**
708 * build a response depending on the "passive" task list
709 */
710 static status_t build_response(private_task_manager_t *this, message_t *request)
711 {
712 enumerator_t *enumerator;
713 task_t *task;
714 message_t *message;
715 host_t *me, *other;
716 bool delete = FALSE, cancelled = FALSE, expect_request = FALSE;
717
718 me = request->get_destination(request);
719 other = request->get_source(request);
720
721 message = message_create(IKEV1_MAJOR_VERSION, IKEV1_MINOR_VERSION);
722 message->set_exchange_type(message, request->get_exchange_type(request));
723 /* send response along the path the request came in */
724 message->set_source(message, me->clone(me));
725 message->set_destination(message, other->clone(other));
726 message->set_message_id(message, request->get_message_id(request));
727 message->set_request(message, FALSE);
728
729 this->responding.mid = request->get_message_id(request);
730 this->responding.retransmitted = 0;
731 this->responding.seqnr++;
732
733 enumerator = this->passive_tasks->create_enumerator(this->passive_tasks);
734 while (enumerator->enumerate(enumerator, (void*)&task))
735 {
736 switch (task->build(task, message))
737 {
738 case SUCCESS:
739 /* task completed, remove it */
740 this->passive_tasks->remove_at(this->passive_tasks, enumerator);
741 task->destroy(task);
742 continue;
743 case NEED_MORE:
744 /* processed, but task needs another exchange */
745 if (task->get_type(task) == TASK_QUICK_MODE ||
746 task->get_type(task) == TASK_AGGRESSIVE_MODE)
747 { /* we rely on initiator retransmission, except for
748 * three-message exchanges */
749 expect_request = TRUE;
750 }
751 continue;
752 case ALREADY_DONE:
753 cancelled = TRUE;
754 break;
755 case FAILED:
756 default:
757 charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
758 /* FALL */
759 case DESTROY_ME:
760 /* destroy IKE_SA, but SEND response first */
761 delete = TRUE;
762 break;
763 }
764 break;
765 }
766 enumerator->destroy(enumerator);
767
768 clear_packets(this->responding.packets);
769 if (cancelled)
770 {
771 message->destroy(message);
772 return initiate(this);
773 }
774 if (!generate_message(this, message, &this->responding.packets))
775 {
776 message->destroy(message);
777 charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
778 return DESTROY_ME;
779 }
780 message->destroy(message);
781
782 if (expect_request && !delete)
783 {
784 return retransmit(this, this->responding.seqnr);
785 }
786 send_packets(this, this->responding.packets);
787 if (delete)
788 {
789 return DESTROY_ME;
790 }
791 return SUCCESS;
792 }
793
794 /**
795 * Send a notify in a separate INFORMATIONAL exchange back to the sender.
796 * The notify protocol_id is set to ISAKMP
797 */
798 static void send_notify(private_task_manager_t *this, message_t *request,
799 notify_type_t type)
800 {
801 message_t *response;
802 array_t *packets = NULL;
803 host_t *me, *other;
804 u_int32_t mid;
805
806 if (request->get_exchange_type(request) == INFORMATIONAL_V1)
807 { /* don't respond to INFORMATIONAL requests to avoid a notify war */
808 DBG1(DBG_IKE, "ignore malformed INFORMATIONAL request");
809 return;
810 }
811 if (!this->rng->get_bytes(this->rng, sizeof(mid), (void*)&mid))
812 {
813 DBG1(DBG_IKE, "failed to allocate message ID");
814 return;
815 }
816 response = message_create(IKEV1_MAJOR_VERSION, IKEV1_MINOR_VERSION);
817 response->set_exchange_type(response, INFORMATIONAL_V1);
818 response->set_request(response, TRUE);
819 response->set_message_id(response, mid);
820 response->add_payload(response, (payload_t*)
821 notify_payload_create_from_protocol_and_type(PLV1_NOTIFY,
822 PROTO_IKE, type));
823
824 me = this->ike_sa->get_my_host(this->ike_sa);
825 if (me->is_anyaddr(me))
826 {
827 me = request->get_destination(request);
828 this->ike_sa->set_my_host(this->ike_sa, me->clone(me));
829 }
830 other = this->ike_sa->get_other_host(this->ike_sa);
831 if (other->is_anyaddr(other))
832 {
833 other = request->get_source(request);
834 this->ike_sa->set_other_host(this->ike_sa, other->clone(other));
835 }
836 response->set_source(response, me->clone(me));
837 response->set_destination(response, other->clone(other));
838 if (generate_message(this, response, &packets))
839 {
840 send_packets(this, packets);
841 }
842 clear_packets(packets);
843 array_destroy(packets);
844 response->destroy(response);
845 }
846
847 /**
848 * Process a DPD request/response
849 */
850 static bool process_dpd(private_task_manager_t *this, message_t *message)
851 {
852 notify_payload_t *notify;
853 notify_type_t type;
854 u_int32_t seq;
855 chunk_t data;
856
857 type = DPD_R_U_THERE;
858 notify = message->get_notify(message, type);
859 if (!notify)
860 {
861 type = DPD_R_U_THERE_ACK;
862 notify = message->get_notify(message, type);
863 }
864 if (!notify)
865 {
866 return FALSE;
867 }
868 data = notify->get_notification_data(notify);
869 if (data.len != 4)
870 {
871 return FALSE;
872 }
873 seq = untoh32(data.ptr);
874
875 if (type == DPD_R_U_THERE)
876 {
877 if (this->dpd_recv == 0 || seq == this->dpd_recv)
878 { /* check sequence validity */
879 this->dpd_recv = seq + 1;
880 this->ike_sa->set_statistic(this->ike_sa, STAT_INBOUND,
881 time_monotonic(NULL));
882 }
883 /* but respond anyway */
884 this->ike_sa->queue_task(this->ike_sa,
885 &isakmp_dpd_create(this->ike_sa, DPD_R_U_THERE_ACK, seq)->task);
886 }
887 else /* DPD_R_U_THERE_ACK */
888 {
889 if (seq == this->dpd_send - 1)
890 {
891 this->ike_sa->set_statistic(this->ike_sa, STAT_INBOUND,
892 time_monotonic(NULL));
893 }
894 else
895 {
896 DBG1(DBG_IKE, "received invalid DPD sequence number %u "
897 "(expected %u), ignored", seq, this->dpd_send - 1);
898 }
899 }
900 return TRUE;
901 }
902
903 /**
904 * handle an incoming request message
905 */
906 static status_t process_request(private_task_manager_t *this,
907 message_t *message)
908 {
909 enumerator_t *enumerator;
910 task_t *task = NULL;
911 bool send_response = FALSE, dpd = FALSE;
912
913 if (message->get_exchange_type(message) == INFORMATIONAL_V1 ||
914 this->passive_tasks->get_count(this->passive_tasks) == 0)
915 { /* create tasks depending on request type, if not already some queued */
916 switch (message->get_exchange_type(message))
917 {
918 case ID_PROT:
919 task = (task_t *)isakmp_vendor_create(this->ike_sa, FALSE);
920 this->passive_tasks->insert_last(this->passive_tasks, task);
921 task = (task_t*)isakmp_cert_pre_create(this->ike_sa, FALSE);
922 this->passive_tasks->insert_last(this->passive_tasks, task);
923 task = (task_t *)main_mode_create(this->ike_sa, FALSE);
924 this->passive_tasks->insert_last(this->passive_tasks, task);
925 task = (task_t*)isakmp_cert_post_create(this->ike_sa, FALSE);
926 this->passive_tasks->insert_last(this->passive_tasks, task);
927 task = (task_t *)isakmp_natd_create(this->ike_sa, FALSE);
928 this->passive_tasks->insert_last(this->passive_tasks, task);
929 break;
930 case AGGRESSIVE:
931 task = (task_t *)isakmp_vendor_create(this->ike_sa, FALSE);
932 this->passive_tasks->insert_last(this->passive_tasks, task);
933 task = (task_t*)isakmp_cert_pre_create(this->ike_sa, FALSE);
934 this->passive_tasks->insert_last(this->passive_tasks, task);
935 task = (task_t *)aggressive_mode_create(this->ike_sa, FALSE);
936 this->passive_tasks->insert_last(this->passive_tasks, task);
937 task = (task_t*)isakmp_cert_post_create(this->ike_sa, FALSE);
938 this->passive_tasks->insert_last(this->passive_tasks, task);
939 task = (task_t *)isakmp_natd_create(this->ike_sa, FALSE);
940 this->passive_tasks->insert_last(this->passive_tasks, task);
941 break;
942 case QUICK_MODE:
943 if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
944 {
945 DBG1(DBG_IKE, "received quick mode request for "
946 "unestablished IKE_SA, ignored");
947 return FAILED;
948 }
949 task = (task_t *)quick_mode_create(this->ike_sa, NULL,
950 NULL, NULL);
951 this->passive_tasks->insert_last(this->passive_tasks, task);
952 break;
953 case INFORMATIONAL_V1:
954 if (process_dpd(this, message))
955 {
956 dpd = TRUE;
957 }
958 else
959 {
960 task = (task_t *)informational_create(this->ike_sa, NULL);
961 this->passive_tasks->insert_first(this->passive_tasks, task);
962 }
963 break;
964 case TRANSACTION:
965 if (this->ike_sa->get_state(this->ike_sa) != IKE_CONNECTING)
966 {
967 task = (task_t *)mode_config_create(this->ike_sa,
968 FALSE, TRUE);
969 }
970 else
971 {
972 task = (task_t *)xauth_create(this->ike_sa, FALSE);
973 }
974 this->passive_tasks->insert_last(this->passive_tasks, task);
975 break;
976 default:
977 return FAILED;
978 }
979 }
980 if (dpd)
981 {
982 return initiate(this);
983 }
984 this->ike_sa->set_statistic(this->ike_sa, STAT_INBOUND, time_monotonic(NULL));
985
986 /* let the tasks process the message */
987 enumerator = this->passive_tasks->create_enumerator(this->passive_tasks);
988 while (enumerator->enumerate(enumerator, (void*)&task))
989 {
990 switch (task->process(task, message))
991 {
992 case SUCCESS:
993 /* task completed, remove it */
994 this->passive_tasks->remove_at(this->passive_tasks, enumerator);
995 task->destroy(task);
996 continue;
997 case NEED_MORE:
998 /* processed, but task needs at least another call to build() */
999 send_response = TRUE;
1000 continue;
1001 case ALREADY_DONE:
1002 send_response = FALSE;
1003 break;
1004 case FAILED:
1005 default:
1006 charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
1007 /* FALL */
1008 case DESTROY_ME:
1009 /* critical failure, destroy IKE_SA */
1010 this->passive_tasks->remove_at(this->passive_tasks, enumerator);
1011 enumerator->destroy(enumerator);
1012 task->destroy(task);
1013 return DESTROY_ME;
1014 }
1015 break;
1016 }
1017 enumerator->destroy(enumerator);
1018
1019 if (send_response)
1020 {
1021 if (build_response(this, message) != SUCCESS)
1022 {
1023 return DESTROY_ME;
1024 }
1025 }
1026 else
1027 { /* We don't send a response, so don't retransmit one if we get
1028 * the same message again. */
1029 clear_packets(this->responding.packets);
1030 }
1031 if (this->passive_tasks->get_count(this->passive_tasks) == 0 &&
1032 this->queued_tasks->get_count(this->queued_tasks) > 0)
1033 {
1034 /* passive tasks completed, check if an active task has been queued,
1035 * such as XAUTH or modeconfig push */
1036 return initiate(this);
1037 }
1038 return SUCCESS;
1039 }
1040
1041 /**
1042 * handle an incoming response message
1043 */
1044 static status_t process_response(private_task_manager_t *this,
1045 message_t *message)
1046 {
1047 enumerator_t *enumerator;
1048 message_t *queued;
1049 status_t status;
1050 task_t *task;
1051
1052 if (message->get_exchange_type(message) != this->initiating.type)
1053 {
1054 /* Windows server sends a fourth quick mode message having an initial
1055 * contact notify. Ignore this message for compatibility. */
1056 if (this->initiating.type == EXCHANGE_TYPE_UNDEFINED &&
1057 message->get_exchange_type(message) == QUICK_MODE &&
1058 message->get_notify(message, INITIAL_CONTACT))
1059 {
1060 DBG1(DBG_IKE, "ignoring fourth Quick Mode message");
1061 return SUCCESS;
1062 }
1063 DBG1(DBG_IKE, "received %N response, but expected %N",
1064 exchange_type_names, message->get_exchange_type(message),
1065 exchange_type_names, this->initiating.type);
1066 charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
1067 return DESTROY_ME;
1068 }
1069
1070 enumerator = this->active_tasks->create_enumerator(this->active_tasks);
1071 while (enumerator->enumerate(enumerator, (void*)&task))
1072 {
1073 switch (task->process(task, message))
1074 {
1075 case SUCCESS:
1076 /* task completed, remove it */
1077 this->active_tasks->remove_at(this->active_tasks, enumerator);
1078 task->destroy(task);
1079 continue;
1080 case NEED_MORE:
1081 /* processed, but task needs another exchange */
1082 continue;
1083 case ALREADY_DONE:
1084 break;
1085 case FAILED:
1086 default:
1087 charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
1088 /* FALL */
1089 case DESTROY_ME:
1090 /* critical failure, destroy IKE_SA */
1091 this->active_tasks->remove_at(this->active_tasks, enumerator);
1092 enumerator->destroy(enumerator);
1093 task->destroy(task);
1094 return DESTROY_ME;
1095 }
1096 break;
1097 }
1098 enumerator->destroy(enumerator);
1099
1100 this->initiating.type = EXCHANGE_TYPE_UNDEFINED;
1101 clear_packets(this->initiating.packets);
1102
1103 if (this->queued && this->active_tasks->get_count(this->active_tasks) == 0)
1104 {
1105 queued = this->queued;
1106 this->queued = NULL;
1107 status = this->public.task_manager.process_message(
1108 &this->public.task_manager, queued);
1109 queued->destroy(queued);
1110 if (status == DESTROY_ME)
1111 {
1112 return status;
1113 }
1114 }
1115
1116 return initiate(this);
1117 }
1118
1119 static status_t handle_fragment(private_task_manager_t *this, message_t *msg)
1120 {
1121 status_t status;
1122
1123 if (!this->defrag)
1124 {
1125 this->defrag = message_create_defrag(msg);
1126 if (!this->defrag)
1127 {
1128 return FAILED;
1129 }
1130 }
1131 status = this->defrag->add_fragment(this->defrag, msg);
1132 if (status == SUCCESS)
1133 {
1134 lib->processor->queue_job(lib->processor,
1135 (job_t*)process_message_job_create(this->defrag));
1136 this->defrag = NULL;
1137 /* do not process the last fragment */
1138 status = NEED_MORE;
1139 }
1140 return status;
1141 }
1142
1143 /**
1144 * Parse the given message and verify that it is valid.
1145 */
1146 static status_t parse_message(private_task_manager_t *this, message_t *msg)
1147 {
1148 status_t status;
1149
1150 status = msg->parse_body(msg, this->ike_sa->get_keymat(this->ike_sa));
1151
1152 if (status != SUCCESS)
1153 {
1154 switch (status)
1155 {
1156 case NOT_SUPPORTED:
1157 DBG1(DBG_IKE, "unsupported exchange type");
1158 send_notify(this, msg, INVALID_EXCHANGE_TYPE);
1159 break;
1160 case PARSE_ERROR:
1161 DBG1(DBG_IKE, "message parsing failed");
1162 send_notify(this, msg, PAYLOAD_MALFORMED);
1163 break;
1164 case VERIFY_ERROR:
1165 DBG1(DBG_IKE, "message verification failed");
1166 send_notify(this, msg, PAYLOAD_MALFORMED);
1167 break;
1168 case FAILED:
1169 DBG1(DBG_IKE, "integrity check failed");
1170 send_notify(this, msg, INVALID_HASH_INFORMATION);
1171 break;
1172 case INVALID_STATE:
1173 DBG1(DBG_IKE, "found encrypted message, but no keys available");
1174 send_notify(this, msg, PAYLOAD_MALFORMED);
1175 default:
1176 break;
1177 }
1178 DBG1(DBG_IKE, "%N %s with message ID %u processing failed",
1179 exchange_type_names, msg->get_exchange_type(msg),
1180 msg->get_request(msg) ? "request" : "response",
1181 msg->get_message_id(msg));
1182
1183 charon->bus->alert(charon->bus, ALERT_PARSE_ERROR_BODY, msg, status);
1184
1185 if (this->ike_sa->get_state(this->ike_sa) == IKE_CREATED)
1186 { /* invalid initiation attempt, close SA */
1187 return DESTROY_ME;
1188 }
1189 }
1190
1191 if (msg->get_first_payload_type(msg) == PLV1_FRAGMENT)
1192 {
1193 return handle_fragment(this, msg);
1194 }
1195 return status;
1196 }
1197
1198 METHOD(task_manager_t, process_message, status_t,
1199 private_task_manager_t *this, message_t *msg)
1200 {
1201 u_int32_t hash, mid, i;
1202 host_t *me, *other;
1203 status_t status;
1204
1205 /* TODO-IKEv1: update hosts more selectively */
1206 me = msg->get_destination(msg);
1207 other = msg->get_source(msg);
1208 mid = msg->get_message_id(msg);
1209 hash = chunk_hash(msg->get_packet_data(msg));
1210 for (i = 0; i < MAX_OLD_HASHES; i++)
1211 {
1212 if (this->initiating.old_hashes[i] == hash)
1213 {
1214 if (array_count(this->initiating.packets) &&
1215 i == (this->initiating.old_hash_pos % MAX_OLD_HASHES) &&
1216 (msg->get_exchange_type(msg) == QUICK_MODE ||
1217 msg->get_exchange_type(msg) == AGGRESSIVE))
1218 {
1219 DBG1(DBG_IKE, "received retransmit of response with ID %u, "
1220 "resending last request", mid);
1221 send_packets(this, this->initiating.packets);
1222 return SUCCESS;
1223 }
1224 DBG1(DBG_IKE, "received retransmit of response with ID %u, "
1225 "but next request already sent", mid);
1226 return SUCCESS;
1227 }
1228 }
1229
1230 if ((mid && mid == this->initiating.mid) ||
1231 (this->initiating.mid == 0 &&
1232 msg->get_exchange_type(msg) == this->initiating.type &&
1233 this->active_tasks->get_count(this->active_tasks)))
1234 {
1235 msg->set_request(msg, FALSE);
1236 charon->bus->message(charon->bus, msg, TRUE, FALSE);
1237 status = parse_message(this, msg);
1238 if (status == NEED_MORE)
1239 {
1240 return SUCCESS;
1241 }
1242 if (status != SUCCESS)
1243 {
1244 return status;
1245 }
1246 this->ike_sa->set_statistic(this->ike_sa, STAT_INBOUND,
1247 time_monotonic(NULL));
1248 this->ike_sa->update_hosts(this->ike_sa, me, other, TRUE);
1249 charon->bus->message(charon->bus, msg, TRUE, TRUE);
1250 if (process_response(this, msg) != SUCCESS)
1251 {
1252 flush(this);
1253 return DESTROY_ME;
1254 }
1255 this->initiating.old_hashes[(++this->initiating.old_hash_pos) %
1256 MAX_OLD_HASHES] = hash;
1257 }
1258 else
1259 {
1260 if (hash == this->responding.hash)
1261 {
1262 if (array_count(this->responding.packets))
1263 {
1264 DBG1(DBG_IKE, "received retransmit of request with ID %u, "
1265 "retransmitting response", mid);
1266 send_packets(this, this->responding.packets);
1267 }
1268 else if (array_count(this->initiating.packets) &&
1269 this->initiating.type == INFORMATIONAL_V1)
1270 {
1271 DBG1(DBG_IKE, "received retransmit of DPD request, "
1272 "retransmitting response");
1273 send_packets(this, this->initiating.packets);
1274 }
1275 else
1276 {
1277 DBG1(DBG_IKE, "received retransmit of request with ID %u, "
1278 "but no response to retransmit", mid);
1279 }
1280 charon->bus->alert(charon->bus, ALERT_RETRANSMIT_RECEIVE, msg);
1281 return SUCCESS;
1282 }
1283
1284 /* reject Main/Aggressive Modes once established */
1285 if (msg->get_exchange_type(msg) == ID_PROT ||
1286 msg->get_exchange_type(msg) == AGGRESSIVE)
1287 {
1288 if (this->ike_sa->get_state(this->ike_sa) != IKE_CREATED &&
1289 this->ike_sa->get_state(this->ike_sa) != IKE_CONNECTING &&
1290 msg->get_first_payload_type(msg) != PLV1_FRAGMENT)
1291 {
1292 DBG1(DBG_IKE, "ignoring %N in established IKE_SA state",
1293 exchange_type_names, msg->get_exchange_type(msg));
1294 return FAILED;
1295 }
1296 }
1297
1298 if (msg->get_exchange_type(msg) == TRANSACTION &&
1299 this->active_tasks->get_count(this->active_tasks))
1300 { /* main mode not yet complete, queue XAuth/Mode config tasks */
1301 if (this->queued)
1302 {
1303 DBG1(DBG_IKE, "ignoring additional %N request, queue full",
1304 exchange_type_names, TRANSACTION);
1305 return SUCCESS;
1306 }
1307 this->queued = message_create_from_packet(msg->get_packet(msg));
1308 if (this->queued->parse_header(this->queued) != SUCCESS)
1309 {
1310 this->queued->destroy(this->queued);
1311 this->queued = NULL;
1312 return FAILED;
1313 }
1314 DBG1(DBG_IKE, "queueing %N request as tasks still active",
1315 exchange_type_names, TRANSACTION);
1316 return SUCCESS;
1317 }
1318
1319 msg->set_request(msg, TRUE);
1320 charon->bus->message(charon->bus, msg, TRUE, FALSE);
1321 status = parse_message(this, msg);
1322 if (status == NEED_MORE)
1323 {
1324 return SUCCESS;
1325 }
1326 if (status != SUCCESS)
1327 {
1328 return status;
1329 }
1330 /* if this IKE_SA is virgin, we check for a config */
1331 if (this->ike_sa->get_ike_cfg(this->ike_sa) == NULL)
1332 {
1333 ike_sa_id_t *ike_sa_id;
1334 ike_cfg_t *ike_cfg;
1335 job_t *job;
1336
1337 ike_cfg = charon->backends->get_ike_cfg(charon->backends,
1338 me, other, IKEV1);
1339 if (ike_cfg == NULL)
1340 {
1341 /* no config found for these hosts, destroy */
1342 DBG1(DBG_IKE, "no IKE config found for %H...%H, sending %N",
1343 me, other, notify_type_names, NO_PROPOSAL_CHOSEN);
1344 send_notify(this, msg, NO_PROPOSAL_CHOSEN);
1345 return DESTROY_ME;
1346 }
1347 this->ike_sa->set_ike_cfg(this->ike_sa, ike_cfg);
1348 ike_cfg->destroy(ike_cfg);
1349 /* add a timeout if peer does not establish it completely */
1350 ike_sa_id = this->ike_sa->get_id(this->ike_sa);
1351 job = (job_t*)delete_ike_sa_job_create(ike_sa_id, FALSE);
1352 lib->scheduler->schedule_job(lib->scheduler, job,
1353 lib->settings->get_int(lib->settings,
1354 "%s.half_open_timeout", HALF_OPEN_IKE_SA_TIMEOUT,
1355 lib->ns));
1356 }
1357 this->ike_sa->update_hosts(this->ike_sa, me, other, TRUE);
1358 charon->bus->message(charon->bus, msg, TRUE, TRUE);
1359 if (process_request(this, msg) != SUCCESS)
1360 {
1361 flush(this);
1362 return DESTROY_ME;
1363 }
1364 this->responding.hash = hash;
1365 }
1366 return SUCCESS;
1367 }
1368
1369 /**
1370 * Check if a given task has been queued already
1371 */
1372 static bool has_queued(private_task_manager_t *this, task_type_t type)
1373 {
1374 enumerator_t *enumerator;
1375 bool found = FALSE;
1376 task_t *task;
1377
1378 enumerator = this->queued_tasks->create_enumerator(this->queued_tasks);
1379 while (enumerator->enumerate(enumerator, &task))
1380 {
1381 if (task->get_type(task) == type)
1382 {
1383 found = TRUE;
1384 break;
1385 }
1386 }
1387 enumerator->destroy(enumerator);
1388 return found;
1389 }
1390
1391 METHOD(task_manager_t, queue_task, void,
1392 private_task_manager_t *this, task_t *task)
1393 {
1394 task_type_t type = task->get_type(task);
1395
1396 switch (type)
1397 {
1398 case TASK_MODE_CONFIG:
1399 case TASK_XAUTH:
1400 if (has_queued(this, type))
1401 {
1402 task->destroy(task);
1403 return;
1404 }
1405 break;
1406 default:
1407 break;
1408 }
1409 DBG2(DBG_IKE, "queueing %N task", task_type_names, task->get_type(task));
1410 this->queued_tasks->insert_last(this->queued_tasks, task);
1411 }
1412
1413 METHOD(task_manager_t, queue_ike, void,
1414 private_task_manager_t *this)
1415 {
1416 peer_cfg_t *peer_cfg;
1417
1418 if (!has_queued(this, TASK_ISAKMP_VENDOR))
1419 {
1420 queue_task(this, (task_t*)isakmp_vendor_create(this->ike_sa, TRUE));
1421 }
1422 if (!has_queued(this, TASK_ISAKMP_CERT_PRE))
1423 {
1424 queue_task(this, (task_t*)isakmp_cert_pre_create(this->ike_sa, TRUE));
1425 }
1426 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
1427 if (peer_cfg->use_aggressive(peer_cfg))
1428 {
1429 if (!has_queued(this, TASK_AGGRESSIVE_MODE))
1430 {
1431 queue_task(this, (task_t*)aggressive_mode_create(this->ike_sa, TRUE));
1432 }
1433 }
1434 else
1435 {
1436 if (!has_queued(this, TASK_MAIN_MODE))
1437 {
1438 queue_task(this, (task_t*)main_mode_create(this->ike_sa, TRUE));
1439 }
1440 }
1441 if (!has_queued(this, TASK_ISAKMP_CERT_POST))
1442 {
1443 queue_task(this, (task_t*)isakmp_cert_post_create(this->ike_sa, TRUE));
1444 }
1445 if (!has_queued(this, TASK_ISAKMP_NATD))
1446 {
1447 queue_task(this, (task_t*)isakmp_natd_create(this->ike_sa, TRUE));
1448 }
1449 }
1450
1451 METHOD(task_manager_t, queue_ike_reauth, void,
1452 private_task_manager_t *this)
1453 {
1454 enumerator_t *enumerator;
1455 child_sa_t *child_sa;
1456 ike_sa_t *new;
1457 host_t *host;
1458
1459 new = charon->ike_sa_manager->checkout_new(charon->ike_sa_manager,
1460 this->ike_sa->get_version(this->ike_sa), TRUE);
1461 if (!new)
1462 { /* shouldn't happen */
1463 return;
1464 }
1465
1466 new->set_peer_cfg(new, this->ike_sa->get_peer_cfg(this->ike_sa));
1467 host = this->ike_sa->get_other_host(this->ike_sa);
1468 new->set_other_host(new, host->clone(host));
1469 host = this->ike_sa->get_my_host(this->ike_sa);
1470 new->set_my_host(new, host->clone(host));
1471 enumerator = this->ike_sa->create_virtual_ip_enumerator(this->ike_sa, TRUE);
1472 while (enumerator->enumerate(enumerator, &host))
1473 {
1474 new->add_virtual_ip(new, TRUE, host);
1475 }
1476 enumerator->destroy(enumerator);
1477
1478 enumerator = this->ike_sa->create_child_sa_enumerator(this->ike_sa);
1479 while (enumerator->enumerate(enumerator, &child_sa))
1480 {
1481 this->ike_sa->remove_child_sa(this->ike_sa, enumerator);
1482 new->add_child_sa(new, child_sa);
1483 }
1484 enumerator->destroy(enumerator);
1485
1486 if (!new->get_child_count(new))
1487 { /* check if a Quick Mode task is queued (UNITY_LOAD_BALANCE case) */
1488 task_t *task;
1489
1490 enumerator = this->queued_tasks->create_enumerator(this->queued_tasks);
1491 while (enumerator->enumerate(enumerator, &task))
1492 {
1493 if (task->get_type(task) == TASK_QUICK_MODE)
1494 {
1495 this->queued_tasks->remove_at(this->queued_tasks, enumerator);
1496 task->migrate(task, new);
1497 new->queue_task(new, task);
1498 }
1499 }
1500 enumerator->destroy(enumerator);
1501 }
1502
1503 if (new->initiate(new, NULL, 0, NULL, NULL) != DESTROY_ME)
1504 {
1505 charon->ike_sa_manager->checkin(charon->ike_sa_manager, new);
1506 this->ike_sa->set_state(this->ike_sa, IKE_REKEYING);
1507 }
1508 else
1509 {
1510 charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager, new);
1511 DBG1(DBG_IKE, "reauthenticating IKE_SA failed");
1512 }
1513 charon->bus->set_sa(charon->bus, this->ike_sa);
1514 }
1515
1516 METHOD(task_manager_t, queue_ike_rekey, void,
1517 private_task_manager_t *this)
1518 {
1519 queue_ike_reauth(this);
1520 }
1521
1522 METHOD(task_manager_t, queue_ike_delete, void,
1523 private_task_manager_t *this)
1524 {
1525 enumerator_t *enumerator;
1526 child_sa_t *child_sa;
1527
1528 enumerator = this->ike_sa->create_child_sa_enumerator(this->ike_sa);
1529 while (enumerator->enumerate(enumerator, &child_sa))
1530 {
1531 queue_task(this, (task_t*)
1532 quick_delete_create(this->ike_sa, child_sa->get_protocol(child_sa),
1533 child_sa->get_spi(child_sa, TRUE), FALSE, FALSE));
1534 }
1535 enumerator->destroy(enumerator);
1536
1537 queue_task(this, (task_t*)isakmp_delete_create(this->ike_sa, TRUE));
1538 }
1539
1540 METHOD(task_manager_t, queue_mobike, void,
1541 private_task_manager_t *this, bool roam, bool address)
1542 {
1543 /* Not supported in IKEv1 */
1544 }
1545
1546 METHOD(task_manager_t, queue_child, void,
1547 private_task_manager_t *this, child_cfg_t *cfg, u_int32_t reqid,
1548 traffic_selector_t *tsi, traffic_selector_t *tsr)
1549 {
1550 quick_mode_t *task;
1551
1552 task = quick_mode_create(this->ike_sa, cfg, tsi, tsr);
1553 task->use_reqid(task, reqid);
1554
1555 queue_task(this, &task->task);
1556 }
1557
1558 /**
1559 * Check if two CHILD_SAs have the same traffic selector
1560 */
1561 static bool have_equal_ts(child_sa_t *child1, child_sa_t *child2, bool local)
1562 {
1563 enumerator_t *e1, *e2;
1564 traffic_selector_t *ts1, *ts2;
1565 bool equal = FALSE;
1566
1567 e1 = child1->create_ts_enumerator(child1, local);
1568 e2 = child2->create_ts_enumerator(child2, local);
1569 if (e1->enumerate(e1, &ts1) && e2->enumerate(e2, &ts2))
1570 {
1571 equal = ts1->equals(ts1, ts2);
1572 }
1573 e2->destroy(e2);
1574 e1->destroy(e1);
1575
1576 return equal;
1577 }
1578
1579 /**
1580 * Check if a CHILD_SA is redundant and we should delete instead of rekey
1581 */
1582 static bool is_redundant(private_task_manager_t *this, child_sa_t *child_sa)
1583 {
1584 enumerator_t *enumerator;
1585 child_sa_t *current;
1586 bool redundant = FALSE;
1587
1588 enumerator = this->ike_sa->create_child_sa_enumerator(this->ike_sa);
1589 while (enumerator->enumerate(enumerator, &current))
1590 {
1591 if (current->get_state(current) == CHILD_INSTALLED &&
1592 streq(current->get_name(current), child_sa->get_name(child_sa)) &&
1593 have_equal_ts(current, child_sa, TRUE) &&
1594 have_equal_ts(current, child_sa, FALSE) &&
1595 current->get_lifetime(current, FALSE) >
1596 child_sa->get_lifetime(child_sa, FALSE))
1597 {
1598 DBG1(DBG_IKE, "deleting redundant CHILD_SA %s{%d}",
1599 child_sa->get_name(child_sa), child_sa->get_reqid(child_sa));
1600 redundant = TRUE;
1601 break;
1602 }
1603 }
1604 enumerator->destroy(enumerator);
1605
1606 return redundant;
1607 }
1608
1609 /**
1610 * Get the first traffic selector of a CHILD_SA, local or remote
1611 */
1612 static traffic_selector_t* get_first_ts(child_sa_t *child_sa, bool local)
1613 {
1614 traffic_selector_t *ts = NULL;
1615 enumerator_t *enumerator;
1616
1617 enumerator = child_sa->create_ts_enumerator(child_sa, local);
1618 enumerator->enumerate(enumerator, &ts);
1619 enumerator->destroy(enumerator);
1620
1621 return ts;
1622 }
1623
1624 METHOD(task_manager_t, queue_child_rekey, void,
1625 private_task_manager_t *this, protocol_id_t protocol, u_int32_t spi)
1626 {
1627 child_sa_t *child_sa;
1628 child_cfg_t *cfg;
1629 quick_mode_t *task;
1630
1631 child_sa = this->ike_sa->get_child_sa(this->ike_sa, protocol, spi, TRUE);
1632 if (!child_sa)
1633 {
1634 child_sa = this->ike_sa->get_child_sa(this->ike_sa, protocol, spi, FALSE);
1635 }
1636 if (child_sa && child_sa->get_state(child_sa) == CHILD_INSTALLED)
1637 {
1638 if (is_redundant(this, child_sa))
1639 {
1640 queue_task(this, (task_t*)quick_delete_create(this->ike_sa,
1641 protocol, spi, FALSE, FALSE));
1642 }
1643 else
1644 {
1645 child_sa->set_state(child_sa, CHILD_REKEYING);
1646 cfg = child_sa->get_config(child_sa);
1647 task = quick_mode_create(this->ike_sa, cfg->get_ref(cfg),
1648 get_first_ts(child_sa, TRUE), get_first_ts(child_sa, FALSE));
1649 task->use_reqid(task, child_sa->get_reqid(child_sa));
1650 task->use_marks(task, child_sa->get_mark(child_sa, TRUE).value,
1651 child_sa->get_mark(child_sa, FALSE).value);
1652 task->rekey(task, child_sa->get_spi(child_sa, TRUE));
1653
1654 queue_task(this, &task->task);
1655 }
1656 }
1657 }
1658
1659 METHOD(task_manager_t, queue_child_delete, void,
1660 private_task_manager_t *this, protocol_id_t protocol, u_int32_t spi,
1661 bool expired)
1662 {
1663 queue_task(this, (task_t*)quick_delete_create(this->ike_sa, protocol,
1664 spi, FALSE, expired));
1665 }
1666
1667 METHOD(task_manager_t, queue_dpd, void,
1668 private_task_manager_t *this)
1669 {
1670 peer_cfg_t *peer_cfg;
1671 u_int32_t t, retransmit;
1672
1673 queue_task(this, (task_t*)isakmp_dpd_create(this->ike_sa, DPD_R_U_THERE,
1674 this->dpd_send++));
1675 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
1676
1677 /* compute timeout in milliseconds */
1678 t = 1000 * peer_cfg->get_dpd_timeout(peer_cfg);
1679 if (t == 0)
1680 {
1681 /* use the same timeout as a retransmitting IKE message would have */
1682 for (retransmit = 0; retransmit <= this->retransmit_tries; retransmit++)
1683 {
1684 t += (u_int32_t)(this->retransmit_timeout * 1000.0 *
1685 pow(this->retransmit_base, retransmit));
1686 }
1687 }
1688
1689 /* schedule DPD timeout job */
1690 lib->scheduler->schedule_job_ms(lib->scheduler,
1691 (job_t*)dpd_timeout_job_create(this->ike_sa->get_id(this->ike_sa)), t);
1692 }
1693
1694 METHOD(task_manager_t, adopt_tasks, void,
1695 private_task_manager_t *this, task_manager_t *other_public)
1696 {
1697 private_task_manager_t *other = (private_task_manager_t*)other_public;
1698 task_t *task;
1699
1700 /* move queued tasks from other to this */
1701 while (other->queued_tasks->remove_last(other->queued_tasks,
1702 (void**)&task) == SUCCESS)
1703 {
1704 DBG2(DBG_IKE, "migrating %N task", task_type_names, task->get_type(task));
1705 task->migrate(task, this->ike_sa);
1706 this->queued_tasks->insert_first(this->queued_tasks, task);
1707 }
1708 }
1709
1710 /**
1711 * Migrates child-creating tasks from src to dst
1712 */
1713 static void migrate_child_tasks(private_task_manager_t *this,
1714 linked_list_t *src, linked_list_t *dst)
1715 {
1716 enumerator_t *enumerator;
1717 task_t *task;
1718
1719 enumerator = src->create_enumerator(src);
1720 while (enumerator->enumerate(enumerator, &task))
1721 {
1722 if (task->get_type(task) == TASK_QUICK_MODE)
1723 {
1724 src->remove_at(src, enumerator);
1725 task->migrate(task, this->ike_sa);
1726 dst->insert_last(dst, task);
1727 }
1728 }
1729 enumerator->destroy(enumerator);
1730 }
1731
1732 METHOD(task_manager_t, adopt_child_tasks, void,
1733 private_task_manager_t *this, task_manager_t *other_public)
1734 {
1735 private_task_manager_t *other = (private_task_manager_t*)other_public;
1736
1737 /* move active child tasks from other to this */
1738 migrate_child_tasks(this, other->active_tasks, this->queued_tasks);
1739 /* do the same for queued tasks */
1740 migrate_child_tasks(this, other->queued_tasks, this->queued_tasks);
1741 }
1742
1743 METHOD(task_manager_t, busy, bool,
1744 private_task_manager_t *this)
1745 {
1746 return (this->active_tasks->get_count(this->active_tasks) > 0);
1747 }
1748
1749 METHOD(task_manager_t, incr_mid, void,
1750 private_task_manager_t *this, bool initiate)
1751 {
1752 }
1753
1754 METHOD(task_manager_t, reset, void,
1755 private_task_manager_t *this, u_int32_t initiate, u_int32_t respond)
1756 {
1757 enumerator_t *enumerator;
1758 task_t *task;
1759
1760 /* reset message counters and retransmit packets */
1761 clear_packets(this->responding.packets);
1762 clear_packets(this->initiating.packets);
1763 this->responding.seqnr = RESPONDING_SEQ;
1764 this->responding.retransmitted = 0;
1765 this->initiating.mid = 0;
1766 this->initiating.seqnr = 0;
1767 this->initiating.retransmitted = 0;
1768 this->initiating.type = EXCHANGE_TYPE_UNDEFINED;
1769 DESTROY_IF(this->defrag);
1770 this->defrag = NULL;
1771 if (initiate != UINT_MAX)
1772 {
1773 this->dpd_send = initiate;
1774 }
1775 if (respond != UINT_MAX)
1776 {
1777 this->dpd_recv = respond;
1778 }
1779
1780 /* reset queued tasks */
1781 enumerator = this->queued_tasks->create_enumerator(this->queued_tasks);
1782 while (enumerator->enumerate(enumerator, &task))
1783 {
1784 task->migrate(task, this->ike_sa);
1785 }
1786 enumerator->destroy(enumerator);
1787
1788 /* reset active tasks */
1789 while (this->active_tasks->remove_last(this->active_tasks,
1790 (void**)&task) == SUCCESS)
1791 {
1792 task->migrate(task, this->ike_sa);
1793 this->queued_tasks->insert_first(this->queued_tasks, task);
1794 }
1795 }
1796
1797 METHOD(task_manager_t, create_task_enumerator, enumerator_t*,
1798 private_task_manager_t *this, task_queue_t queue)
1799 {
1800 switch (queue)
1801 {
1802 case TASK_QUEUE_ACTIVE:
1803 return this->active_tasks->create_enumerator(this->active_tasks);
1804 case TASK_QUEUE_PASSIVE:
1805 return this->passive_tasks->create_enumerator(this->passive_tasks);
1806 case TASK_QUEUE_QUEUED:
1807 return this->queued_tasks->create_enumerator(this->queued_tasks);
1808 default:
1809 return enumerator_create_empty();
1810 }
1811 }
1812
1813 METHOD(task_manager_t, destroy, void,
1814 private_task_manager_t *this)
1815 {
1816 flush(this);
1817
1818 this->active_tasks->destroy(this->active_tasks);
1819 this->queued_tasks->destroy(this->queued_tasks);
1820 this->passive_tasks->destroy(this->passive_tasks);
1821 DESTROY_IF(this->defrag);
1822
1823 DESTROY_IF(this->queued);
1824 clear_packets(this->responding.packets);
1825 array_destroy(this->responding.packets);
1826 clear_packets(this->initiating.packets);
1827 array_destroy(this->initiating.packets);
1828 DESTROY_IF(this->rng);
1829 free(this);
1830 }
1831
1832 /*
1833 * see header file
1834 */
1835 task_manager_v1_t *task_manager_v1_create(ike_sa_t *ike_sa)
1836 {
1837 private_task_manager_t *this;
1838
1839 INIT(this,
1840 .public = {
1841 .task_manager = {
1842 .process_message = _process_message,
1843 .queue_task = _queue_task,
1844 .queue_ike = _queue_ike,
1845 .queue_ike_rekey = _queue_ike_rekey,
1846 .queue_ike_reauth = _queue_ike_reauth,
1847 .queue_ike_delete = _queue_ike_delete,
1848 .queue_mobike = _queue_mobike,
1849 .queue_child = _queue_child,
1850 .queue_child_rekey = _queue_child_rekey,
1851 .queue_child_delete = _queue_child_delete,
1852 .queue_dpd = _queue_dpd,
1853 .initiate = _initiate,
1854 .retransmit = _retransmit,
1855 .incr_mid = _incr_mid,
1856 .reset = _reset,
1857 .adopt_tasks = _adopt_tasks,
1858 .adopt_child_tasks = _adopt_child_tasks,
1859 .busy = _busy,
1860 .create_task_enumerator = _create_task_enumerator,
1861 .flush = _flush,
1862 .flush_queue = _flush_queue,
1863 .destroy = _destroy,
1864 },
1865 },
1866 .initiating = {
1867 .type = EXCHANGE_TYPE_UNDEFINED,
1868 },
1869 .responding = {
1870 .seqnr = RESPONDING_SEQ,
1871 },
1872 .ike_sa = ike_sa,
1873 .rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK),
1874 .queued_tasks = linked_list_create(),
1875 .active_tasks = linked_list_create(),
1876 .passive_tasks = linked_list_create(),
1877 .retransmit_tries = lib->settings->get_int(lib->settings,
1878 "%s.retransmit_tries", RETRANSMIT_TRIES, lib->ns),
1879 .retransmit_timeout = lib->settings->get_double(lib->settings,
1880 "%s.retransmit_timeout", RETRANSMIT_TIMEOUT, lib->ns),
1881 .retransmit_base = lib->settings->get_double(lib->settings,
1882 "%s.retransmit_base", RETRANSMIT_BASE, lib->ns),
1883 );
1884
1885 if (!this->rng)
1886 {
1887 DBG1(DBG_IKE, "no RNG found, unable to create IKE_SA");
1888 destroy(this);
1889 return NULL;
1890 }
1891 if (!this->rng->get_bytes(this->rng, sizeof(this->dpd_send),
1892 (void*)&this->dpd_send))
1893 {
1894 DBG1(DBG_IKE, "failed to allocate message ID, unable to create IKE_SA");
1895 destroy(this);
1896 return NULL;
1897 }
1898 this->dpd_send &= 0x7FFFFFFF;
1899
1900 return &this->public;
1901 }