99d15377ed0b79eea34ea9e14d29732f01e4b8d1
[strongswan.git] / src / charon / sa / child_sa.c
1 /*
2 * Copyright (C) 2006-2009 Tobias Brunner
3 * Copyright (C) 2005-2008 Martin Willi
4 * Copyright (C) 2006 Daniel Roethlisberger
5 * Copyright (C) 2005 Jan Hutter
6 * Hochschule fuer Technik Rapperswil
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * for more details.
17 */
18
19 #define _GNU_SOURCE
20 #include "child_sa.h"
21
22 #include <stdio.h>
23 #include <string.h>
24 #include <time.h>
25
26 #include <daemon.h>
27
28 ENUM(child_sa_state_names, CHILD_CREATED, CHILD_DESTROYING,
29 "CREATED",
30 "ROUTED",
31 "INSTALLING",
32 "INSTALLED",
33 "UPDATING",
34 "REKEYING",
35 "DELETING",
36 "DESTROYING",
37 );
38
39 typedef struct private_child_sa_t private_child_sa_t;
40
41 /**
42 * Private data of a child_sa_t object.
43 */
44 struct private_child_sa_t {
45 /**
46 * Public interface of child_sa_t.
47 */
48 child_sa_t public;
49
50 /**
51 * address of us
52 */
53 host_t *my_addr;
54
55 /**
56 * address of remote
57 */
58 host_t *other_addr;
59
60 /**
61 * our actually used SPI, 0 if unused
62 */
63 u_int32_t my_spi;
64
65 /**
66 * others used SPI, 0 if unused
67 */
68 u_int32_t other_spi;
69
70 /**
71 * our Compression Parameter Index (CPI) used, 0 if unused
72 */
73 u_int16_t my_cpi;
74
75 /**
76 * others Compression Parameter Index (CPI) used, 0 if unused
77 */
78 u_int16_t other_cpi;
79
80 /**
81 * List for local traffic selectors
82 */
83 linked_list_t *my_ts;
84
85 /**
86 * List for remote traffic selectors
87 */
88 linked_list_t *other_ts;
89
90 /**
91 * Protocol used to protect this SA, ESP|AH
92 */
93 protocol_id_t protocol;
94
95 /**
96 * reqid used for this child_sa
97 */
98 u_int32_t reqid;
99
100 /**
101 * absolute time when rekeying is scheduled
102 */
103 time_t rekey_time;
104
105 /**
106 * absolute time when the SA expires
107 */
108 time_t expire_time;
109
110 /**
111 * state of the CHILD_SA
112 */
113 child_sa_state_t state;
114
115 /**
116 * Specifies if UDP encapsulation is enabled (NAT traversal)
117 */
118 bool encap;
119
120 /**
121 * Specifies the IPComp transform used (IPCOMP_NONE if disabled)
122 */
123 ipcomp_transform_t ipcomp;
124
125 /**
126 * mode this SA uses, tunnel/transport
127 */
128 ipsec_mode_t mode;
129
130 /**
131 * selected proposal
132 */
133 proposal_t *proposal;
134
135 /**
136 * config used to create this child
137 */
138 child_cfg_t *config;
139
140 /**
141 * time of last use in seconds (inbound)
142 */
143 u_int32_t my_usetime;
144
145 /**
146 * time of last use in seconds (outbound)
147 */
148 u_int32_t other_usetime;
149
150 /**
151 * last number of inbound bytes
152 */
153 u_int64_t my_usebytes;
154
155 /**
156 * last number of outbound bytes
157 */
158 u_int64_t other_usebytes;
159 };
160
161 /**
162 * Implementation of child_sa_t.get_name
163 */
164 static char *get_name(private_child_sa_t *this)
165 {
166 return this->config->get_name(this->config);
167 }
168
169 /**
170 * Implements child_sa_t.get_reqid
171 */
172 static u_int32_t get_reqid(private_child_sa_t *this)
173 {
174 return this->reqid;
175 }
176
177 /**
178 * Implements child_sa_t.get_config
179 */
180 static child_cfg_t* get_config(private_child_sa_t *this)
181 {
182 return this->config;
183 }
184
185 /**
186 * Implements child_sa_t.set_state
187 */
188 static void set_state(private_child_sa_t *this, child_sa_state_t state)
189 {
190 charon->bus->child_state_change(charon->bus, &this->public, state);
191 this->state = state;
192 }
193
194 /**
195 * Implements child_sa_t.get_state
196 */
197 static child_sa_state_t get_state(private_child_sa_t *this)
198 {
199 return this->state;
200 }
201
202 /**
203 * Implements child_sa_t.get_spi
204 */
205 u_int32_t get_spi(private_child_sa_t *this, bool inbound)
206 {
207 return inbound ? this->my_spi : this->other_spi;
208 }
209
210 /**
211 * Implements child_sa_t.get_cpi
212 */
213 u_int16_t get_cpi(private_child_sa_t *this, bool inbound)
214 {
215 return inbound ? this->my_cpi : this->other_cpi;
216 }
217
218 /**
219 * Implements child_sa_t.get_protocol
220 */
221 protocol_id_t get_protocol(private_child_sa_t *this)
222 {
223 return this->protocol;
224 }
225
226 /**
227 * Implementation of child_sa_t.set_protocol
228 */
229 static void set_protocol(private_child_sa_t *this, protocol_id_t protocol)
230 {
231 this->protocol = protocol;
232 }
233
234 /**
235 * Implementation of child_sa_t.get_mode
236 */
237 static ipsec_mode_t get_mode(private_child_sa_t *this)
238 {
239 return this->mode;
240 }
241
242 /**
243 * Implementation of child_sa_t.set_mode
244 */
245 static void set_mode(private_child_sa_t *this, ipsec_mode_t mode)
246 {
247 this->mode = mode;
248 }
249
250 /**
251 * Implementation of child_sa_t.has_encap
252 */
253 static bool has_encap(private_child_sa_t *this)
254 {
255 return this->encap;
256 }
257
258 /**
259 * Implementation of child_sa_t.get_ipcomp
260 */
261 static ipcomp_transform_t get_ipcomp(private_child_sa_t *this)
262 {
263 return this->ipcomp;
264 }
265
266 /**
267 * Implementation of child_sa_t.set_ipcomp.
268 */
269 static void set_ipcomp(private_child_sa_t *this, ipcomp_transform_t ipcomp)
270 {
271 this->ipcomp = ipcomp;
272 }
273
274 /**
275 * Implementation of child_sa_t.get_proposal
276 */
277 static proposal_t* get_proposal(private_child_sa_t *this)
278 {
279 return this->proposal;
280 }
281
282 /**
283 * Implementation of child_sa_t.set_proposal
284 */
285 static void set_proposal(private_child_sa_t *this, proposal_t *proposal)
286 {
287 this->proposal = proposal->clone(proposal);
288 }
289
290 /**
291 * Implementation of child_sa_t.get_traffic_selectors.
292 */
293 static linked_list_t *get_traffic_selectors(private_child_sa_t *this, bool local)
294 {
295 return local ? this->my_ts : this->other_ts;
296 }
297
298 typedef struct policy_enumerator_t policy_enumerator_t;
299
300 /**
301 * Private policy enumerator
302 */
303 struct policy_enumerator_t {
304 /** implements enumerator_t */
305 enumerator_t public;
306 /** enumerator over own TS */
307 enumerator_t *mine;
308 /** enumerator over others TS */
309 enumerator_t *other;
310 /** list of others TS, to recreate enumerator */
311 linked_list_t *list;
312 /** currently enumerating TS for "me" side */
313 traffic_selector_t *ts;
314 };
315
316 /**
317 * enumerator function of create_policy_enumerator()
318 */
319 static bool policy_enumerate(policy_enumerator_t *this,
320 traffic_selector_t **my_out, traffic_selector_t **other_out)
321 {
322 traffic_selector_t *other_ts;
323
324 while (this->ts || this->mine->enumerate(this->mine, &this->ts))
325 {
326 if (!this->other->enumerate(this->other, &other_ts))
327 { /* end of others list, restart with new of mine */
328 this->other->destroy(this->other);
329 this->other = this->list->create_enumerator(this->list);
330 this->ts = NULL;
331 continue;
332 }
333 if (this->ts->get_type(this->ts) != other_ts->get_type(other_ts))
334 { /* family mismatch */
335 continue;
336 }
337 if (this->ts->get_protocol(this->ts) &&
338 other_ts->get_protocol(other_ts) &&
339 this->ts->get_protocol(this->ts) != other_ts->get_protocol(other_ts))
340 { /* protocol mismatch */
341 continue;
342 }
343 *my_out = this->ts;
344 *other_out = other_ts;
345 return TRUE;
346 }
347 return FALSE;
348 }
349
350 /**
351 * destroy function of create_policy_enumerator()
352 */
353 static void policy_destroy(policy_enumerator_t *this)
354 {
355 this->mine->destroy(this->mine);
356 this->other->destroy(this->other);
357 free(this);
358 }
359
360 /**
361 * Implementation of child_sa_t.create_policy_enumerator
362 */
363 static enumerator_t* create_policy_enumerator(private_child_sa_t *this)
364 {
365 policy_enumerator_t *e = malloc_thing(policy_enumerator_t);
366
367 e->public.enumerate = (void*)policy_enumerate;
368 e->public.destroy = (void*)policy_destroy;
369 e->mine = this->my_ts->create_enumerator(this->my_ts);
370 e->other = this->other_ts->create_enumerator(this->other_ts);
371 e->list = this->other_ts;
372 e->ts = NULL;
373
374 return &e->public;
375 }
376
377 /**
378 * update the cached usebytes
379 * returns SUCCESS if the usebytes have changed, FAILED if not or no SPIs
380 * are available, and NOT_SUPPORTED if the kernel interface does not support
381 * querying the usebytes.
382 */
383 static status_t update_usebytes(private_child_sa_t *this, bool inbound)
384 {
385 status_t status = FAILED;
386 u_int64_t bytes;
387
388 if (inbound)
389 {
390 if (this->my_spi)
391 {
392 status = charon->kernel_interface->query_sa(
393 charon->kernel_interface,
394 this->other_addr, this->my_addr,
395 this->my_spi, this->protocol, &bytes);
396 if (status == SUCCESS)
397 {
398 if (bytes > this->my_usebytes)
399 {
400 this->my_usebytes = bytes;
401 return SUCCESS;
402 }
403 return FAILED;
404 }
405 }
406 }
407 else
408 {
409 if (this->other_spi)
410 {
411 status = charon->kernel_interface->query_sa(
412 charon->kernel_interface,
413 this->my_addr, this->other_addr,
414 this->other_spi, this->protocol, &bytes);
415 if (status == SUCCESS)
416 {
417 if (bytes > this->other_usebytes)
418 {
419 this->other_usebytes = bytes;
420 return SUCCESS;
421 }
422 return FAILED;
423 }
424 }
425 }
426 return status;
427 }
428
429 /**
430 * updates the cached usetime
431 */
432 static void update_usetime(private_child_sa_t *this, bool inbound)
433 {
434 enumerator_t *enumerator;
435 traffic_selector_t *my_ts, *other_ts;
436 u_int32_t last_use = 0;
437
438 enumerator = create_policy_enumerator(this);
439 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
440 {
441 u_int32_t in, out, fwd;
442
443 if (inbound)
444 {
445 if (charon->kernel_interface->query_policy(charon->kernel_interface,
446 other_ts, my_ts, POLICY_IN, &in) == SUCCESS)
447 {
448 last_use = max(last_use, in);
449 }
450 if (this->mode != MODE_TRANSPORT)
451 {
452 if (charon->kernel_interface->query_policy(charon->kernel_interface,
453 other_ts, my_ts, POLICY_FWD, &fwd) == SUCCESS)
454 {
455 last_use = max(last_use, fwd);
456 }
457 }
458 }
459 else
460 {
461 if (charon->kernel_interface->query_policy(charon->kernel_interface,
462 my_ts, other_ts, POLICY_OUT, &out) == SUCCESS)
463 {
464 last_use = max(last_use, out);
465 }
466 }
467 }
468 enumerator->destroy(enumerator);
469
470 if (last_use == 0)
471 {
472 return;
473 }
474 if (inbound)
475 {
476 this->my_usetime = last_use;
477 }
478 else
479 {
480 this->other_usetime = last_use;
481 }
482 }
483
484 /**
485 * Implementation of child_sa_t.get_usestats
486 */
487 static void get_usestats(private_child_sa_t *this, bool inbound,
488 time_t *time, u_int64_t *bytes)
489 {
490 if (update_usebytes(this, inbound) != FAILED)
491 {
492 /* there was traffic since last update or the kernel interface
493 * does not support querying the number of usebytes.
494 */
495 update_usetime(this, inbound);
496 }
497 if (time)
498 {
499 *time = inbound ? this->my_usetime : this->other_usetime;
500 }
501 if (bytes)
502 {
503 *bytes = inbound ? this->my_usebytes : this->other_usebytes;
504 }
505 }
506
507 /**
508 * Implementation of child_sa_t.get_lifetime
509 */
510 static u_int32_t get_lifetime(private_child_sa_t *this, bool hard)
511 {
512 return hard ? this->expire_time : this->rekey_time;
513 }
514
515 /**
516 * Implementation of child_sa_t.alloc_spi
517 */
518 static u_int32_t alloc_spi(private_child_sa_t *this, protocol_id_t protocol)
519 {
520 if (charon->kernel_interface->get_spi(charon->kernel_interface,
521 this->other_addr, this->my_addr, protocol,
522 this->reqid, &this->my_spi) == SUCCESS)
523 {
524 return this->my_spi;
525 }
526 return 0;
527 }
528
529 /**
530 * Implementation of child_sa_t.alloc_cpi
531 */
532 static u_int16_t alloc_cpi(private_child_sa_t *this)
533 {
534 if (charon->kernel_interface->get_cpi(charon->kernel_interface,
535 this->other_addr, this->my_addr, this->reqid,
536 &this->my_cpi) == SUCCESS)
537 {
538 return this->my_cpi;
539 }
540 return 0;
541 }
542
543 /**
544 * Implementation of child_sa_t.install
545 */
546 static status_t install(private_child_sa_t *this, chunk_t encr, chunk_t integ,
547 u_int32_t spi, u_int16_t cpi, bool inbound)
548 {
549 u_int16_t enc_alg = ENCR_UNDEFINED, int_alg = AUTH_UNDEFINED, size;
550 time_t now;
551 lifetime_cfg_t *lifetime;
552 host_t *src, *dst;
553 status_t status;
554 bool update = FALSE;
555
556 /* now we have to decide which spi to use. Use self allocated, if "in",
557 * or the one in the proposal, if not "in" (others). Additionally,
558 * source and dest host switch depending on the role */
559 if (inbound)
560 {
561 dst = this->my_addr;
562 src = this->other_addr;
563 if (this->my_spi == spi)
564 { /* alloc_spi has been called, do an SA update */
565 update = TRUE;
566 }
567 this->my_spi = spi;
568 this->my_cpi = cpi;
569 }
570 else
571 {
572 src = this->my_addr;
573 dst = this->other_addr;
574 this->other_spi = spi;
575 this->other_cpi = cpi;
576 }
577
578 DBG2(DBG_CHD, "adding %s %N SA", inbound ? "inbound" : "outbound",
579 protocol_id_names, this->protocol);
580
581 /* send SA down to the kernel */
582 DBG2(DBG_CHD, " SPI 0x%.8x, src %H dst %H", ntohl(spi), src, dst);
583
584 this->proposal->get_algorithm(this->proposal, ENCRYPTION_ALGORITHM,
585 &enc_alg, &size);
586 this->proposal->get_algorithm(this->proposal, INTEGRITY_ALGORITHM,
587 &int_alg, &size);
588
589 lifetime = this->config->get_lifetime(this->config);
590
591 now = time_monotonic(NULL);
592 if (lifetime->rekey_time)
593 {
594 this->rekey_time = now + lifetime->rekey_time;
595 }
596 if (lifetime->life_time)
597 {
598 this->expire_time = now + lifetime->life_time;
599 }
600
601 if (!lifetime->jitter_time && !inbound)
602 { /* avoid triggering multiple rekey events */
603 lifetime->rekey_time = 0;
604 }
605
606 status = charon->kernel_interface->add_sa(charon->kernel_interface,
607 src, dst, spi, this->protocol, this->reqid, lifetime,
608 enc_alg, encr, int_alg, integ, this->mode, this->ipcomp, cpi,
609 this->encap, update);
610
611 free(lifetime);
612
613 return status;
614 }
615
616 /**
617 * Implementation of child_sa_t.add_policies
618 */
619 static status_t add_policies(private_child_sa_t *this,
620 linked_list_t *my_ts_list, linked_list_t *other_ts_list)
621 {
622 enumerator_t *enumerator;
623 traffic_selector_t *my_ts, *other_ts;
624 status_t status = SUCCESS;
625 bool routed = (this->state == CHILD_CREATED);
626
627 /* apply traffic selectors */
628 enumerator = my_ts_list->create_enumerator(my_ts_list);
629 while (enumerator->enumerate(enumerator, &my_ts))
630 {
631 this->my_ts->insert_last(this->my_ts, my_ts->clone(my_ts));
632 }
633 enumerator->destroy(enumerator);
634 enumerator = other_ts_list->create_enumerator(other_ts_list);
635 while (enumerator->enumerate(enumerator, &other_ts))
636 {
637 this->other_ts->insert_last(this->other_ts, other_ts->clone(other_ts));
638 }
639 enumerator->destroy(enumerator);
640
641 if (this->config->install_policy(this->config))
642 {
643 /* enumerate pairs of traffic selectors */
644 enumerator = create_policy_enumerator(this);
645 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
646 {
647 /* install 3 policies: out, in and forward */
648 status |= charon->kernel_interface->add_policy(charon->kernel_interface,
649 this->my_addr, this->other_addr, my_ts, other_ts, POLICY_OUT,
650 this->other_spi, this->protocol, this->reqid, this->mode,
651 this->ipcomp, this->other_cpi, routed);
652
653 status |= charon->kernel_interface->add_policy(charon->kernel_interface,
654 this->other_addr, this->my_addr, other_ts, my_ts, POLICY_IN,
655 this->my_spi, this->protocol, this->reqid, this->mode,
656 this->ipcomp, this->my_cpi, routed);
657 if (this->mode != MODE_TRANSPORT)
658 {
659 status |= charon->kernel_interface->add_policy(charon->kernel_interface,
660 this->other_addr, this->my_addr, other_ts, my_ts, POLICY_FWD,
661 this->my_spi, this->protocol, this->reqid, this->mode,
662 this->ipcomp, this->my_cpi, routed);
663 }
664
665 if (status != SUCCESS)
666 {
667 break;
668 }
669 }
670 enumerator->destroy(enumerator);
671 }
672
673 if (status == SUCCESS && this->state == CHILD_CREATED)
674 { /* switch to routed state if no SAD entry set up */
675 set_state(this, CHILD_ROUTED);
676 }
677 return status;
678 }
679
680 /**
681 * Implementation of child_sa_t.update.
682 */
683 static status_t update(private_child_sa_t *this, host_t *me, host_t *other,
684 host_t *vip, bool encap)
685 {
686 child_sa_state_t old;
687 bool transport_proxy_mode;
688
689 /* anything changed at all? */
690 if (me->equals(me, this->my_addr) &&
691 other->equals(other, this->other_addr) && this->encap == encap)
692 {
693 return SUCCESS;
694 }
695
696 old = this->state;
697 set_state(this, CHILD_UPDATING);
698 transport_proxy_mode = this->config->use_proxy_mode(this->config) &&
699 this->mode == MODE_TRANSPORT;
700
701 if (!transport_proxy_mode)
702 {
703 /* update our (initator) SA */
704 if (this->my_spi)
705 {
706 if (charon->kernel_interface->update_sa(charon->kernel_interface,
707 this->my_spi, this->protocol,
708 this->ipcomp != IPCOMP_NONE ? this->my_cpi : 0,
709 this->other_addr, this->my_addr, other, me,
710 this->encap, encap) == NOT_SUPPORTED)
711 {
712 return NOT_SUPPORTED;
713 }
714 }
715
716 /* update his (responder) SA */
717 if (this->other_spi)
718 {
719 if (charon->kernel_interface->update_sa(charon->kernel_interface,
720 this->other_spi, this->protocol,
721 this->ipcomp != IPCOMP_NONE ? this->other_cpi : 0,
722 this->my_addr, this->other_addr, me, other,
723 this->encap, encap) == NOT_SUPPORTED)
724 {
725 return NOT_SUPPORTED;
726 }
727 }
728 }
729
730 if (this->config->install_policy(this->config))
731 {
732 /* update policies */
733 if (!me->ip_equals(me, this->my_addr) ||
734 !other->ip_equals(other, this->other_addr))
735 {
736 enumerator_t *enumerator;
737 traffic_selector_t *my_ts, *other_ts;
738
739 /* always use high priorities, as hosts getting updated are INSTALLED */
740 enumerator = create_policy_enumerator(this);
741 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
742 {
743 /* remove old policies first */
744 charon->kernel_interface->del_policy(charon->kernel_interface,
745 my_ts, other_ts, POLICY_OUT, FALSE);
746 charon->kernel_interface->del_policy(charon->kernel_interface,
747 other_ts, my_ts, POLICY_IN, FALSE);
748 if (this->mode != MODE_TRANSPORT)
749 {
750 charon->kernel_interface->del_policy(charon->kernel_interface,
751 other_ts, my_ts, POLICY_FWD, FALSE);
752 }
753
754 /* check whether we have to update a "dynamic" traffic selector */
755 if (!me->ip_equals(me, this->my_addr) &&
756 my_ts->is_host(my_ts, this->my_addr))
757 {
758 my_ts->set_address(my_ts, me);
759 }
760 if (!other->ip_equals(other, this->other_addr) &&
761 other_ts->is_host(other_ts, this->other_addr))
762 {
763 other_ts->set_address(other_ts, other);
764 }
765
766 /* we reinstall the virtual IP to handle interface roaming
767 * correctly */
768 if (vip)
769 {
770 charon->kernel_interface->del_ip(charon->kernel_interface, vip);
771 charon->kernel_interface->add_ip(charon->kernel_interface, vip, me);
772 }
773
774 /* reinstall updated policies */
775 charon->kernel_interface->add_policy(charon->kernel_interface,
776 me, other, my_ts, other_ts, POLICY_OUT, this->other_spi,
777 this->protocol, this->reqid, this->mode, this->ipcomp,
778 this->other_cpi, FALSE);
779 charon->kernel_interface->add_policy(charon->kernel_interface,
780 other, me, other_ts, my_ts, POLICY_IN, this->my_spi,
781 this->protocol, this->reqid, this->mode, this->ipcomp,
782 this->my_cpi, FALSE);
783 if (this->mode != MODE_TRANSPORT)
784 {
785 charon->kernel_interface->add_policy(charon->kernel_interface,
786 other, me, other_ts, my_ts, POLICY_FWD, this->my_spi,
787 this->protocol, this->reqid, this->mode, this->ipcomp,
788 this->my_cpi, FALSE);
789 }
790 }
791 enumerator->destroy(enumerator);
792 }
793 }
794
795 if (!transport_proxy_mode)
796 {
797 /* apply hosts */
798 if (!me->equals(me, this->my_addr))
799 {
800 this->my_addr->destroy(this->my_addr);
801 this->my_addr = me->clone(me);
802 }
803 if (!other->equals(other, this->other_addr))
804 {
805 this->other_addr->destroy(this->other_addr);
806 this->other_addr = other->clone(other);
807 }
808 }
809
810 this->encap = encap;
811 set_state(this, old);
812
813 return SUCCESS;
814 }
815
816 /**
817 * Implementation of child_sa_t.destroy.
818 */
819 static void destroy(private_child_sa_t *this)
820 {
821 enumerator_t *enumerator;
822 traffic_selector_t *my_ts, *other_ts;
823 bool unrouted = (this->state == CHILD_ROUTED);
824
825 set_state(this, CHILD_DESTROYING);
826
827 /* delete SAs in the kernel, if they are set up */
828 if (this->my_spi)
829 {
830 /* if CHILD was not established, use PROTO_ESP used during alloc_spi().
831 * TODO: For AH support, we have to store protocol specific SPI.s */
832 if (this->protocol == PROTO_NONE)
833 {
834 this->protocol = PROTO_ESP;
835 }
836 charon->kernel_interface->del_sa(charon->kernel_interface,
837 this->other_addr, this->my_addr, this->my_spi,
838 this->protocol, this->my_cpi);
839 }
840 if (this->other_spi)
841 {
842 charon->kernel_interface->del_sa(charon->kernel_interface,
843 this->my_addr, this->other_addr, this->other_spi,
844 this->protocol, this->other_cpi);
845 }
846
847 if (this->config->install_policy(this->config))
848 {
849 /* delete all policies in the kernel */
850 enumerator = create_policy_enumerator(this);
851 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
852 {
853 charon->kernel_interface->del_policy(charon->kernel_interface,
854 my_ts, other_ts, POLICY_OUT, unrouted);
855 charon->kernel_interface->del_policy(charon->kernel_interface,
856 other_ts, my_ts, POLICY_IN, unrouted);
857 if (this->mode != MODE_TRANSPORT)
858 {
859 charon->kernel_interface->del_policy(charon->kernel_interface,
860 other_ts, my_ts, POLICY_FWD, unrouted);
861 }
862 }
863 enumerator->destroy(enumerator);
864 }
865
866 this->my_ts->destroy_offset(this->my_ts, offsetof(traffic_selector_t, destroy));
867 this->other_ts->destroy_offset(this->other_ts, offsetof(traffic_selector_t, destroy));
868 this->my_addr->destroy(this->my_addr);
869 this->other_addr->destroy(this->other_addr);
870 DESTROY_IF(this->proposal);
871 this->config->destroy(this->config);
872 free(this);
873 }
874
875 /*
876 * Described in header.
877 */
878 child_sa_t * child_sa_create(host_t *me, host_t* other,
879 child_cfg_t *config, u_int32_t rekey, bool encap)
880 {
881 static u_int32_t reqid = 0;
882 private_child_sa_t *this = malloc_thing(private_child_sa_t);
883
884 /* public functions */
885 this->public.get_name = (char*(*)(child_sa_t*))get_name;
886 this->public.get_reqid = (u_int32_t(*)(child_sa_t*))get_reqid;
887 this->public.get_config = (child_cfg_t*(*)(child_sa_t*))get_config;
888 this->public.get_state = (child_sa_state_t(*)(child_sa_t*))get_state;
889 this->public.set_state = (void(*)(child_sa_t*,child_sa_state_t))set_state;
890 this->public.get_spi = (u_int32_t(*)(child_sa_t*, bool))get_spi;
891 this->public.get_cpi = (u_int16_t(*)(child_sa_t*, bool))get_cpi;
892 this->public.get_protocol = (protocol_id_t(*)(child_sa_t*))get_protocol;
893 this->public.set_protocol = (void(*)(child_sa_t*, protocol_id_t protocol))set_protocol;
894 this->public.get_mode = (ipsec_mode_t(*)(child_sa_t*))get_mode;
895 this->public.set_mode = (void(*)(child_sa_t*, ipsec_mode_t mode))set_mode;
896 this->public.get_proposal = (proposal_t*(*)(child_sa_t*))get_proposal;
897 this->public.set_proposal = (void(*)(child_sa_t*, proposal_t *proposal))set_proposal;
898 this->public.get_lifetime = (u_int32_t(*)(child_sa_t*, bool))get_lifetime;
899 this->public.get_usestats = (void(*)(child_sa_t*,bool,time_t*,u_int64_t*))get_usestats;
900 this->public.has_encap = (bool(*)(child_sa_t*))has_encap;
901 this->public.get_ipcomp = (ipcomp_transform_t(*)(child_sa_t*))get_ipcomp;
902 this->public.set_ipcomp = (void(*)(child_sa_t*,ipcomp_transform_t))set_ipcomp;
903 this->public.alloc_spi = (u_int32_t(*)(child_sa_t*, protocol_id_t protocol))alloc_spi;
904 this->public.alloc_cpi = (u_int16_t(*)(child_sa_t*))alloc_cpi;
905 this->public.install = (status_t(*)(child_sa_t*, chunk_t encr, chunk_t integ, u_int32_t spi, u_int16_t cpi, bool inbound))install;
906 this->public.update = (status_t (*)(child_sa_t*,host_t*,host_t*,host_t*,bool))update;
907 this->public.add_policies = (status_t (*)(child_sa_t*, linked_list_t*,linked_list_t*))add_policies;
908 this->public.get_traffic_selectors = (linked_list_t*(*)(child_sa_t*,bool))get_traffic_selectors;
909 this->public.create_policy_enumerator = (enumerator_t*(*)(child_sa_t*))create_policy_enumerator;
910 this->public.destroy = (void(*)(child_sa_t*))destroy;
911
912 /* private data */
913 this->my_addr = me->clone(me);
914 this->other_addr = other->clone(other);
915 this->my_spi = 0;
916 this->other_spi = 0;
917 this->my_cpi = 0;
918 this->other_cpi = 0;
919 this->encap = encap;
920 this->ipcomp = IPCOMP_NONE;
921 this->state = CHILD_CREATED;
922 this->my_usetime = 0;
923 this->other_usetime = 0;
924 this->my_usebytes = 0;
925 this->other_usebytes = 0;
926 /* reuse old reqid if we are rekeying an existing CHILD_SA */
927 this->reqid = rekey ? rekey : ++reqid;
928 this->my_ts = linked_list_create();
929 this->other_ts = linked_list_create();
930 this->protocol = PROTO_NONE;
931 this->mode = MODE_TUNNEL;
932 this->proposal = NULL;
933 this->rekey_time = 0;
934 this->expire_time = 0;
935 this->config = config;
936 config->get_ref(config);
937
938 /* MIPv6 proxy transport mode sets SA endpoints to TS hosts */
939 if (config->get_mode(config) == MODE_TRANSPORT &&
940 config->use_proxy_mode(config))
941 {
942 ts_type_t type;
943 int family;
944 chunk_t addr;
945 host_t *host;
946 enumerator_t *enumerator;
947 linked_list_t *my_ts_list, *other_ts_list;
948 traffic_selector_t *my_ts, *other_ts;
949
950 this->mode = MODE_TRANSPORT;
951
952 my_ts_list = config->get_traffic_selectors(config, TRUE, NULL, me);
953 enumerator = my_ts_list->create_enumerator(my_ts_list);
954 if (enumerator->enumerate(enumerator, &my_ts))
955 {
956 if (my_ts->is_host(my_ts, NULL) &&
957 !my_ts->is_host(my_ts, this->my_addr))
958 {
959 type = my_ts->get_type(my_ts);
960 family = (type == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
961 addr = my_ts->get_from_address(my_ts);
962 host = host_create_from_chunk(family, addr, 0);
963 free(addr.ptr);
964 DBG1(DBG_CHD, "my address: %H is a transport mode proxy for %H",
965 this->my_addr, host);
966 this->my_addr->destroy(this->my_addr);
967 this->my_addr = host;
968 }
969 }
970 enumerator->destroy(enumerator);
971 my_ts_list->destroy_offset(my_ts_list, offsetof(traffic_selector_t, destroy));
972
973 other_ts_list = config->get_traffic_selectors(config, FALSE, NULL, other);
974 enumerator = other_ts_list->create_enumerator(other_ts_list);
975 if (enumerator->enumerate(enumerator, &other_ts))
976 {
977 if (other_ts->is_host(other_ts, NULL) &&
978 !other_ts->is_host(other_ts, this->other_addr))
979 {
980 type = other_ts->get_type(other_ts);
981 family = (type == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
982 addr = other_ts->get_from_address(other_ts);
983 host = host_create_from_chunk(family, addr, 0);
984 free(addr.ptr);
985 DBG1(DBG_CHD, "other address: %H is a transport mode proxy for %H",
986 this->other_addr, host);
987 this->other_addr->destroy(this->other_addr);
988 this->other_addr = host;
989 }
990 }
991 enumerator->destroy(enumerator);
992 other_ts_list->destroy_offset(other_ts_list, offsetof(traffic_selector_t, destroy));
993 }
994
995 return &this->public;
996 }