cda150f8736d010cf8d897071427daf8a02a337a
[strongswan.git] / src / libcharon / sa / child_sa.c
1 /*
2 * Copyright (C) 2006-2011 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 <hydra.h>
27 #include <daemon.h>
28
29 ENUM(child_sa_state_names, CHILD_CREATED, CHILD_DESTROYING,
30 "CREATED",
31 "ROUTED",
32 "INSTALLING",
33 "INSTALLED",
34 "UPDATING",
35 "REKEYING",
36 "DELETING",
37 "DESTROYING",
38 );
39
40 typedef struct private_child_sa_t private_child_sa_t;
41
42 /**
43 * Private data of a child_sa_t object.
44 */
45 struct private_child_sa_t {
46 /**
47 * Public interface of child_sa_t.
48 */
49 child_sa_t public;
50
51 /**
52 * address of us
53 */
54 host_t *my_addr;
55
56 /**
57 * address of remote
58 */
59 host_t *other_addr;
60
61 /**
62 * our actually used SPI, 0 if unused
63 */
64 u_int32_t my_spi;
65
66 /**
67 * others used SPI, 0 if unused
68 */
69 u_int32_t other_spi;
70
71 /**
72 * our Compression Parameter Index (CPI) used, 0 if unused
73 */
74 u_int16_t my_cpi;
75
76 /**
77 * others Compression Parameter Index (CPI) used, 0 if unused
78 */
79 u_int16_t other_cpi;
80
81 /**
82 * List for local traffic selectors
83 */
84 linked_list_t *my_ts;
85
86 /**
87 * List for remote traffic selectors
88 */
89 linked_list_t *other_ts;
90
91 /**
92 * Protocol used to protect this SA, ESP|AH
93 */
94 protocol_id_t protocol;
95
96 /**
97 * reqid used for this child_sa
98 */
99 u_int32_t reqid;
100
101 /**
102 * inbound mark used for this child_sa
103 */
104 mark_t mark_in;
105
106 /**
107 * outbound mark used for this child_sa
108 */
109 mark_t mark_out;
110
111 /**
112 * absolute time when rekeying is scheduled
113 */
114 time_t rekey_time;
115
116 /**
117 * absolute time when the SA expires
118 */
119 time_t expire_time;
120
121 /**
122 * state of the CHILD_SA
123 */
124 child_sa_state_t state;
125
126 /**
127 * Specifies if UDP encapsulation is enabled (NAT traversal)
128 */
129 bool encap;
130
131 /**
132 * Specifies the IPComp transform used (IPCOMP_NONE if disabled)
133 */
134 ipcomp_transform_t ipcomp;
135
136 /**
137 * mode this SA uses, tunnel/transport
138 */
139 ipsec_mode_t mode;
140
141 /**
142 * Action to enforce if peer closes the CHILD_SA
143 */
144 action_t close_action;
145
146 /**
147 * Action to enforce if peer is considered dead
148 */
149 action_t dpd_action;
150
151 /**
152 * selected proposal
153 */
154 proposal_t *proposal;
155
156 /**
157 * config used to create this child
158 */
159 child_cfg_t *config;
160
161 /**
162 * time of last use in seconds (inbound)
163 */
164 u_int32_t my_usetime;
165
166 /**
167 * time of last use in seconds (outbound)
168 */
169 u_int32_t other_usetime;
170
171 /**
172 * last number of inbound bytes
173 */
174 u_int64_t my_usebytes;
175
176 /**
177 * last number of outbound bytes
178 */
179 u_int64_t other_usebytes;
180 };
181
182 /**
183 * convert an IKEv2 specific protocol identifier to the IP protocol identifier.
184 */
185 static inline u_int8_t proto_ike2ip(protocol_id_t protocol)
186 {
187 switch (protocol)
188 {
189 case PROTO_ESP:
190 return IPPROTO_ESP;
191 case PROTO_AH:
192 return IPPROTO_AH;
193 default:
194 return protocol;
195 }
196 }
197
198 METHOD(child_sa_t, get_name, char*,
199 private_child_sa_t *this)
200 {
201 return this->config->get_name(this->config);
202 }
203
204 METHOD(child_sa_t, get_reqid, u_int32_t,
205 private_child_sa_t *this)
206 {
207 return this->reqid;
208 }
209
210 METHOD(child_sa_t, get_config, child_cfg_t*,
211 private_child_sa_t *this)
212 {
213 return this->config;
214 }
215
216 METHOD(child_sa_t, set_state, void,
217 private_child_sa_t *this, child_sa_state_t state)
218 {
219 charon->bus->child_state_change(charon->bus, &this->public, state);
220 this->state = state;
221 }
222
223 METHOD(child_sa_t, get_state, child_sa_state_t,
224 private_child_sa_t *this)
225 {
226 return this->state;
227 }
228
229 METHOD(child_sa_t, get_spi, u_int32_t,
230 private_child_sa_t *this, bool inbound)
231 {
232 return inbound ? this->my_spi : this->other_spi;
233 }
234
235 METHOD(child_sa_t, get_cpi, u_int16_t,
236 private_child_sa_t *this, bool inbound)
237 {
238 return inbound ? this->my_cpi : this->other_cpi;
239 }
240
241 METHOD(child_sa_t, get_protocol, protocol_id_t,
242 private_child_sa_t *this)
243 {
244 return this->protocol;
245 }
246
247 METHOD(child_sa_t, set_protocol, void,
248 private_child_sa_t *this, protocol_id_t protocol)
249 {
250 this->protocol = protocol;
251 }
252
253 METHOD(child_sa_t, get_mode, ipsec_mode_t,
254 private_child_sa_t *this)
255 {
256 return this->mode;
257 }
258
259 METHOD(child_sa_t, set_mode, void,
260 private_child_sa_t *this, ipsec_mode_t mode)
261 {
262 this->mode = mode;
263 }
264
265 METHOD(child_sa_t, has_encap, bool,
266 private_child_sa_t *this)
267 {
268 return this->encap;
269 }
270
271 METHOD(child_sa_t, get_ipcomp, ipcomp_transform_t,
272 private_child_sa_t *this)
273 {
274 return this->ipcomp;
275 }
276
277 METHOD(child_sa_t, set_ipcomp, void,
278 private_child_sa_t *this, ipcomp_transform_t ipcomp)
279 {
280 this->ipcomp = ipcomp;
281 }
282
283 METHOD(child_sa_t, set_close_action, void,
284 private_child_sa_t *this, action_t action)
285 {
286 this->close_action = action;
287 }
288
289 METHOD(child_sa_t, get_close_action, action_t,
290 private_child_sa_t *this)
291 {
292 return this->close_action;
293 }
294
295 METHOD(child_sa_t, set_dpd_action, void,
296 private_child_sa_t *this, action_t action)
297 {
298 this->dpd_action = action;
299 }
300
301 METHOD(child_sa_t, get_dpd_action, action_t,
302 private_child_sa_t *this)
303 {
304 return this->dpd_action;
305 }
306
307 METHOD(child_sa_t, get_proposal, proposal_t*,
308 private_child_sa_t *this)
309 {
310 return this->proposal;
311 }
312
313 METHOD(child_sa_t, set_proposal, void,
314 private_child_sa_t *this, proposal_t *proposal)
315 {
316 this->proposal = proposal->clone(proposal);
317 }
318
319 METHOD(child_sa_t, get_traffic_selectors, linked_list_t*,
320 private_child_sa_t *this, bool local)
321 {
322 return local ? this->my_ts : this->other_ts;
323 }
324
325 typedef struct policy_enumerator_t policy_enumerator_t;
326
327 /**
328 * Private policy enumerator
329 */
330 struct policy_enumerator_t {
331 /** implements enumerator_t */
332 enumerator_t public;
333 /** enumerator over own TS */
334 enumerator_t *mine;
335 /** enumerator over others TS */
336 enumerator_t *other;
337 /** list of others TS, to recreate enumerator */
338 linked_list_t *list;
339 /** currently enumerating TS for "me" side */
340 traffic_selector_t *ts;
341 };
342
343 METHOD(enumerator_t, policy_enumerate, bool,
344 policy_enumerator_t *this, traffic_selector_t **my_out,
345 traffic_selector_t **other_out)
346 {
347 traffic_selector_t *other_ts;
348
349 while (this->ts || this->mine->enumerate(this->mine, &this->ts))
350 {
351 if (!this->other->enumerate(this->other, &other_ts))
352 { /* end of others list, restart with new of mine */
353 this->other->destroy(this->other);
354 this->other = this->list->create_enumerator(this->list);
355 this->ts = NULL;
356 continue;
357 }
358 if (this->ts->get_type(this->ts) != other_ts->get_type(other_ts))
359 { /* family mismatch */
360 continue;
361 }
362 if (this->ts->get_protocol(this->ts) &&
363 other_ts->get_protocol(other_ts) &&
364 this->ts->get_protocol(this->ts) != other_ts->get_protocol(other_ts))
365 { /* protocol mismatch */
366 continue;
367 }
368 *my_out = this->ts;
369 *other_out = other_ts;
370 return TRUE;
371 }
372 return FALSE;
373 }
374
375 METHOD(enumerator_t, policy_destroy, void,
376 policy_enumerator_t *this)
377 {
378 this->mine->destroy(this->mine);
379 this->other->destroy(this->other);
380 free(this);
381 }
382
383 METHOD(child_sa_t, create_policy_enumerator, enumerator_t*,
384 private_child_sa_t *this)
385 {
386 policy_enumerator_t *e;
387
388 INIT(e,
389 .public = {
390 .enumerate = (void*)_policy_enumerate,
391 .destroy = _policy_destroy,
392 },
393 .mine = this->my_ts->create_enumerator(this->my_ts),
394 .other = this->other_ts->create_enumerator(this->other_ts),
395 .list = this->other_ts,
396 .ts = NULL,
397 );
398
399 return &e->public;
400 }
401
402 /**
403 * update the cached usebytes
404 * returns SUCCESS if the usebytes have changed, FAILED if not or no SPIs
405 * are available, and NOT_SUPPORTED if the kernel interface does not support
406 * querying the usebytes.
407 */
408 static status_t update_usebytes(private_child_sa_t *this, bool inbound)
409 {
410 status_t status = FAILED;
411 u_int64_t bytes;
412
413 if (inbound)
414 {
415 if (this->my_spi)
416 {
417 status = hydra->kernel_interface->query_sa(hydra->kernel_interface,
418 this->other_addr, this->my_addr, this->my_spi,
419 proto_ike2ip(this->protocol), this->mark_in,
420 &bytes);
421 if (status == SUCCESS)
422 {
423 if (bytes > this->my_usebytes)
424 {
425 this->my_usebytes = bytes;
426 return SUCCESS;
427 }
428 return FAILED;
429 }
430 }
431 }
432 else
433 {
434 if (this->other_spi)
435 {
436 status = hydra->kernel_interface->query_sa(hydra->kernel_interface,
437 this->my_addr, this->other_addr, this->other_spi,
438 proto_ike2ip(this->protocol), this->mark_out,
439 &bytes);
440 if (status == SUCCESS)
441 {
442 if (bytes > this->other_usebytes)
443 {
444 this->other_usebytes = bytes;
445 return SUCCESS;
446 }
447 return FAILED;
448 }
449 }
450 }
451 return status;
452 }
453
454 /**
455 * updates the cached usetime
456 */
457 static void update_usetime(private_child_sa_t *this, bool inbound)
458 {
459 enumerator_t *enumerator;
460 traffic_selector_t *my_ts, *other_ts;
461 u_int32_t last_use = 0;
462
463 enumerator = create_policy_enumerator(this);
464 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
465 {
466 u_int32_t in, out, fwd;
467
468 if (inbound)
469 {
470 if (hydra->kernel_interface->query_policy(hydra->kernel_interface,
471 other_ts, my_ts, POLICY_IN, this->mark_in, &in) == SUCCESS)
472 {
473 last_use = max(last_use, in);
474 }
475 if (this->mode != MODE_TRANSPORT)
476 {
477 if (hydra->kernel_interface->query_policy(hydra->kernel_interface,
478 other_ts, my_ts, POLICY_FWD, this->mark_in, &fwd) == SUCCESS)
479 {
480 last_use = max(last_use, fwd);
481 }
482 }
483 }
484 else
485 {
486 if (hydra->kernel_interface->query_policy(hydra->kernel_interface,
487 my_ts, other_ts, POLICY_OUT, this->mark_out, &out) == SUCCESS)
488 {
489 last_use = max(last_use, out);
490 }
491 }
492 }
493 enumerator->destroy(enumerator);
494
495 if (last_use == 0)
496 {
497 return;
498 }
499 if (inbound)
500 {
501 this->my_usetime = last_use;
502 }
503 else
504 {
505 this->other_usetime = last_use;
506 }
507 }
508
509 METHOD(child_sa_t, get_usestats, void,
510 private_child_sa_t *this, bool inbound, time_t *time, u_int64_t *bytes)
511 {
512 if (update_usebytes(this, inbound) != FAILED)
513 {
514 /* there was traffic since last update or the kernel interface
515 * does not support querying the number of usebytes.
516 */
517 update_usetime(this, inbound);
518 }
519 if (time)
520 {
521 *time = inbound ? this->my_usetime : this->other_usetime;
522 }
523 if (bytes)
524 {
525 *bytes = inbound ? this->my_usebytes : this->other_usebytes;
526 }
527 }
528
529 METHOD(child_sa_t, get_lifetime, time_t,
530 private_child_sa_t *this, bool hard)
531 {
532 return hard ? this->expire_time : this->rekey_time;
533 }
534
535 METHOD(child_sa_t, alloc_spi, u_int32_t,
536 private_child_sa_t *this, protocol_id_t protocol)
537 {
538 if (hydra->kernel_interface->get_spi(hydra->kernel_interface,
539 this->other_addr, this->my_addr,
540 proto_ike2ip(protocol), this->reqid,
541 &this->my_spi) == SUCCESS)
542 {
543 return this->my_spi;
544 }
545 return 0;
546 }
547
548 METHOD(child_sa_t, alloc_cpi, u_int16_t,
549 private_child_sa_t *this)
550 {
551 if (hydra->kernel_interface->get_cpi(hydra->kernel_interface,
552 this->other_addr, this->my_addr,
553 this->reqid, &this->my_cpi) == SUCCESS)
554 {
555 return this->my_cpi;
556 }
557 return 0;
558 }
559
560 METHOD(child_sa_t, install, status_t,
561 private_child_sa_t *this, chunk_t encr, chunk_t integ, u_int32_t spi,
562 u_int16_t cpi, bool inbound, bool tfcv3, linked_list_t *my_ts,
563 linked_list_t *other_ts)
564 {
565 u_int16_t enc_alg = ENCR_UNDEFINED, int_alg = AUTH_UNDEFINED, size;
566 u_int16_t esn = NO_EXT_SEQ_NUMBERS;
567 traffic_selector_t *src_ts = NULL, *dst_ts = NULL;
568 time_t now;
569 lifetime_cfg_t *lifetime;
570 u_int32_t tfc = 0;
571 host_t *src, *dst;
572 status_t status;
573 bool update = FALSE;
574
575 /* now we have to decide which spi to use. Use self allocated, if "in",
576 * or the one in the proposal, if not "in" (others). Additionally,
577 * source and dest host switch depending on the role */
578 if (inbound)
579 {
580 dst = this->my_addr;
581 src = this->other_addr;
582 if (this->my_spi == spi)
583 { /* alloc_spi has been called, do an SA update */
584 update = TRUE;
585 }
586 this->my_spi = spi;
587 this->my_cpi = cpi;
588 }
589 else
590 {
591 src = this->my_addr;
592 dst = this->other_addr;
593 this->other_spi = spi;
594 this->other_cpi = cpi;
595
596 if (tfcv3)
597 {
598 tfc = this->config->get_tfc(this->config);
599 }
600 }
601
602 DBG2(DBG_CHD, "adding %s %N SA", inbound ? "inbound" : "outbound",
603 protocol_id_names, this->protocol);
604
605 /* send SA down to the kernel */
606 DBG2(DBG_CHD, " SPI 0x%.8x, src %H dst %H", ntohl(spi), src, dst);
607
608 this->proposal->get_algorithm(this->proposal, ENCRYPTION_ALGORITHM,
609 &enc_alg, &size);
610 this->proposal->get_algorithm(this->proposal, INTEGRITY_ALGORITHM,
611 &int_alg, &size);
612 this->proposal->get_algorithm(this->proposal, EXTENDED_SEQUENCE_NUMBERS,
613 &esn, NULL);
614
615 lifetime = this->config->get_lifetime(this->config);
616
617 now = time_monotonic(NULL);
618 if (lifetime->time.rekey)
619 {
620 this->rekey_time = now + lifetime->time.rekey;
621 }
622 if (lifetime->time.life)
623 {
624 this->expire_time = now + lifetime->time.life;
625 }
626
627 if (!lifetime->time.jitter && !inbound)
628 { /* avoid triggering multiple rekey events */
629 lifetime->time.rekey = 0;
630 }
631
632 if (this->mode == MODE_BEET || this->mode == MODE_TRANSPORT)
633 {
634 /* BEET requires the bound address from the traffic selectors.
635 * TODO: We add just the first traffic selector for now, as the
636 * kernel accepts a single TS per SA only */
637 if (inbound)
638 {
639 my_ts->get_first(my_ts, (void**)&dst_ts);
640 other_ts->get_first(other_ts, (void**)&src_ts);
641 }
642 else
643 {
644 my_ts->get_first(my_ts, (void**)&src_ts);
645 other_ts->get_first(other_ts, (void**)&dst_ts);
646 }
647 }
648
649 status = hydra->kernel_interface->add_sa(hydra->kernel_interface,
650 src, dst, spi, proto_ike2ip(this->protocol), this->reqid,
651 inbound ? this->mark_in : this->mark_out, tfc,
652 lifetime, enc_alg, encr, int_alg, integ, this->mode,
653 this->ipcomp, cpi, this->encap, esn, update, src_ts, dst_ts);
654
655 free(lifetime);
656
657 return status;
658 }
659
660 /**
661 * Install 3 policies: out, in and forward
662 */
663 static status_t install_policies_internal(private_child_sa_t *this,
664 host_t *my_addr, host_t *other_addr, traffic_selector_t *my_ts,
665 traffic_selector_t *other_ts, ipsec_sa_cfg_t *my_sa,
666 ipsec_sa_cfg_t *other_sa, policy_type_t type, policy_priority_t priority)
667 {
668 status_t status = SUCCESS;
669 status |= hydra->kernel_interface->add_policy(hydra->kernel_interface,
670 my_addr, other_addr, my_ts, other_ts,
671 POLICY_OUT, type, other_sa,
672 this->mark_out, priority);
673
674 status |= hydra->kernel_interface->add_policy(hydra->kernel_interface,
675 other_addr, my_addr, other_ts, my_ts,
676 POLICY_IN, type, my_sa,
677 this->mark_in, priority);
678 if (this->mode != MODE_TRANSPORT)
679 {
680 status |= hydra->kernel_interface->add_policy(hydra->kernel_interface,
681 other_addr, my_addr, other_ts, my_ts,
682 POLICY_FWD, type, my_sa,
683 this->mark_in, priority);
684 }
685 return status;
686 }
687
688 /**
689 * Delete 3 policies: out, in and forward
690 */
691 static void del_policies_internal(private_child_sa_t *this,
692 traffic_selector_t *my_ts, traffic_selector_t *other_ts,
693 policy_priority_t priority)
694 {
695 hydra->kernel_interface->del_policy(hydra->kernel_interface,
696 my_ts, other_ts, POLICY_OUT, this->reqid,
697 this->mark_out, priority);
698 hydra->kernel_interface->del_policy(hydra->kernel_interface,
699 other_ts, my_ts, POLICY_IN, this->reqid,
700 this->mark_in, priority);
701 if (this->mode != MODE_TRANSPORT)
702 {
703 hydra->kernel_interface->del_policy(hydra->kernel_interface,
704 other_ts, my_ts, POLICY_FWD, this->reqid,
705 this->mark_in, priority);
706 }
707 }
708
709 METHOD(child_sa_t, add_policies, status_t,
710 private_child_sa_t *this, linked_list_t *my_ts_list,
711 linked_list_t *other_ts_list)
712 {
713 enumerator_t *enumerator;
714 traffic_selector_t *my_ts, *other_ts;
715 status_t status = SUCCESS;
716
717 /* apply traffic selectors */
718 enumerator = my_ts_list->create_enumerator(my_ts_list);
719 while (enumerator->enumerate(enumerator, &my_ts))
720 {
721 this->my_ts->insert_last(this->my_ts, my_ts->clone(my_ts));
722 }
723 enumerator->destroy(enumerator);
724 enumerator = other_ts_list->create_enumerator(other_ts_list);
725 while (enumerator->enumerate(enumerator, &other_ts))
726 {
727 this->other_ts->insert_last(this->other_ts, other_ts->clone(other_ts));
728 }
729 enumerator->destroy(enumerator);
730
731 if (this->config->install_policy(this->config))
732 {
733 policy_priority_t priority;
734 ipsec_sa_cfg_t my_sa = {
735 .mode = this->mode,
736 .reqid = this->reqid,
737 .ipcomp = {
738 .transform = this->ipcomp,
739 },
740 }, other_sa = my_sa;
741
742 my_sa.ipcomp.cpi = this->my_cpi;
743 other_sa.ipcomp.cpi = this->other_cpi;
744
745 if (this->protocol == PROTO_ESP)
746 {
747 my_sa.esp.use = TRUE;
748 my_sa.esp.spi = this->my_spi;
749 other_sa.esp.use = TRUE;
750 other_sa.esp.spi = this->other_spi;
751 }
752 else
753 {
754 my_sa.ah.use = TRUE;
755 my_sa.ah.spi = this->my_spi;
756 other_sa.ah.use = TRUE;
757 other_sa.ah.spi = this->other_spi;
758 }
759
760 priority = this->state == CHILD_CREATED ? POLICY_PRIORITY_ROUTED
761 : POLICY_PRIORITY_DEFAULT;
762
763 /* enumerate pairs of traffic selectors */
764 enumerator = create_policy_enumerator(this);
765 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
766 {
767 /* install outbound drop policy to avoid packets leaving unencrypted
768 * when updating policies */
769 if (priority == POLICY_PRIORITY_DEFAULT)
770 {
771 status |= install_policies_internal(this, this->my_addr,
772 this->other_addr, my_ts, other_ts,
773 &my_sa, &other_sa, POLICY_DROP,
774 POLICY_PRIORITY_FALLBACK);
775 }
776
777 /* install policies */
778 status |= install_policies_internal(this, this->my_addr,
779 this->other_addr, my_ts, other_ts,
780 &my_sa, &other_sa, POLICY_IPSEC, priority);
781
782 if (status != SUCCESS)
783 {
784 break;
785 }
786 }
787 enumerator->destroy(enumerator);
788 }
789
790 if (status == SUCCESS && this->state == CHILD_CREATED)
791 { /* switch to routed state if no SAD entry set up */
792 set_state(this, CHILD_ROUTED);
793 }
794 return status;
795 }
796
797 METHOD(child_sa_t, update, status_t,
798 private_child_sa_t *this, host_t *me, host_t *other, host_t *vip,
799 bool encap)
800 {
801 child_sa_state_t old;
802 bool transport_proxy_mode;
803
804 /* anything changed at all? */
805 if (me->equals(me, this->my_addr) &&
806 other->equals(other, this->other_addr) && this->encap == encap)
807 {
808 return SUCCESS;
809 }
810
811 old = this->state;
812 set_state(this, CHILD_UPDATING);
813 transport_proxy_mode = this->config->use_proxy_mode(this->config) &&
814 this->mode == MODE_TRANSPORT;
815
816 if (!transport_proxy_mode)
817 {
818 /* update our (initator) SA */
819 if (this->my_spi)
820 {
821 if (hydra->kernel_interface->update_sa(hydra->kernel_interface,
822 this->my_spi, proto_ike2ip(this->protocol),
823 this->ipcomp != IPCOMP_NONE ? this->my_cpi : 0,
824 this->other_addr, this->my_addr, other, me,
825 this->encap, encap, this->mark_in) == NOT_SUPPORTED)
826 {
827 return NOT_SUPPORTED;
828 }
829 }
830
831 /* update his (responder) SA */
832 if (this->other_spi)
833 {
834 if (hydra->kernel_interface->update_sa(hydra->kernel_interface,
835 this->other_spi, proto_ike2ip(this->protocol),
836 this->ipcomp != IPCOMP_NONE ? this->other_cpi : 0,
837 this->my_addr, this->other_addr, me, other,
838 this->encap, encap, this->mark_out) == NOT_SUPPORTED)
839 {
840 return NOT_SUPPORTED;
841 }
842 }
843 }
844
845 if (this->config->install_policy(this->config))
846 {
847 ipsec_sa_cfg_t my_sa = {
848 .mode = this->mode,
849 .reqid = this->reqid,
850 .ipcomp = {
851 .transform = this->ipcomp,
852 },
853 }, other_sa = my_sa;
854
855 my_sa.ipcomp.cpi = this->my_cpi;
856 other_sa.ipcomp.cpi = this->other_cpi;
857
858 if (this->protocol == PROTO_ESP)
859 {
860 my_sa.esp.use = TRUE;
861 my_sa.esp.spi = this->my_spi;
862 other_sa.esp.use = TRUE;
863 other_sa.esp.spi = this->other_spi;
864 }
865 else
866 {
867 my_sa.ah.use = TRUE;
868 my_sa.ah.spi = this->my_spi;
869 other_sa.ah.use = TRUE;
870 other_sa.ah.spi = this->other_spi;
871 }
872
873 /* update policies */
874 if (!me->ip_equals(me, this->my_addr) ||
875 !other->ip_equals(other, this->other_addr))
876 {
877 enumerator_t *enumerator;
878 traffic_selector_t *my_ts, *other_ts;
879
880 /* always use high priorities, as hosts getting updated are INSTALLED */
881 enumerator = create_policy_enumerator(this);
882 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
883 {
884 /* remove old policies first */
885 del_policies_internal(this, my_ts, other_ts,
886 POLICY_PRIORITY_DEFAULT);
887
888 /* check if we have to update a "dynamic" traffic selector */
889 if (!me->ip_equals(me, this->my_addr) &&
890 my_ts->is_host(my_ts, this->my_addr))
891 {
892 my_ts->set_address(my_ts, me);
893 }
894 if (!other->ip_equals(other, this->other_addr) &&
895 other_ts->is_host(other_ts, this->other_addr))
896 {
897 other_ts->set_address(other_ts, other);
898 }
899
900 /* we reinstall the virtual IP to handle interface roaming
901 * correctly */
902 if (vip)
903 {
904 hydra->kernel_interface->del_ip(hydra->kernel_interface, vip);
905 hydra->kernel_interface->add_ip(hydra->kernel_interface, vip, me);
906 }
907
908 /* reinstall updated policies */
909 install_policies_internal(this, me, other, my_ts, other_ts,
910 &my_sa, &other_sa, POLICY_IPSEC,
911 POLICY_PRIORITY_DEFAULT);
912 }
913 enumerator->destroy(enumerator);
914 }
915 }
916
917 if (!transport_proxy_mode)
918 {
919 /* apply hosts */
920 if (!me->equals(me, this->my_addr))
921 {
922 this->my_addr->destroy(this->my_addr);
923 this->my_addr = me->clone(me);
924 }
925 if (!other->equals(other, this->other_addr))
926 {
927 this->other_addr->destroy(this->other_addr);
928 this->other_addr = other->clone(other);
929 }
930 }
931
932 this->encap = encap;
933 set_state(this, old);
934
935 return SUCCESS;
936 }
937
938 METHOD(child_sa_t, destroy, void,
939 private_child_sa_t *this)
940 {
941 enumerator_t *enumerator;
942 traffic_selector_t *my_ts, *other_ts;
943 policy_priority_t priority;
944
945 priority = this->state == CHILD_ROUTED ? POLICY_PRIORITY_ROUTED
946 : POLICY_PRIORITY_DEFAULT;
947
948 set_state(this, CHILD_DESTROYING);
949
950 /* delete SAs in the kernel, if they are set up */
951 if (this->my_spi)
952 {
953 /* if CHILD was not established, use PROTO_ESP used during alloc_spi().
954 * TODO: For AH support, we have to store protocol specific SPI.s */
955 if (this->protocol == PROTO_NONE)
956 {
957 this->protocol = PROTO_ESP;
958 }
959 hydra->kernel_interface->del_sa(hydra->kernel_interface,
960 this->other_addr, this->my_addr, this->my_spi,
961 proto_ike2ip(this->protocol), this->my_cpi,
962 this->mark_in);
963 }
964 if (this->other_spi)
965 {
966 hydra->kernel_interface->del_sa(hydra->kernel_interface,
967 this->my_addr, this->other_addr, this->other_spi,
968 proto_ike2ip(this->protocol), this->other_cpi,
969 this->mark_out);
970 }
971
972 if (this->config->install_policy(this->config))
973 {
974 /* delete all policies in the kernel */
975 enumerator = create_policy_enumerator(this);
976 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
977 {
978 del_policies_internal(this, my_ts, other_ts, priority);
979 if (priority == POLICY_PRIORITY_DEFAULT)
980 {
981 del_policies_internal(this, my_ts, other_ts,
982 POLICY_PRIORITY_FALLBACK);
983 }
984 }
985 enumerator->destroy(enumerator);
986 }
987
988 this->my_ts->destroy_offset(this->my_ts, offsetof(traffic_selector_t, destroy));
989 this->other_ts->destroy_offset(this->other_ts, offsetof(traffic_selector_t, destroy));
990 this->my_addr->destroy(this->my_addr);
991 this->other_addr->destroy(this->other_addr);
992 DESTROY_IF(this->proposal);
993 this->config->destroy(this->config);
994 free(this);
995 }
996
997 /**
998 * Described in header.
999 */
1000 child_sa_t * child_sa_create(host_t *me, host_t* other,
1001 child_cfg_t *config, u_int32_t rekey, bool encap)
1002 {
1003 static u_int32_t reqid = 0;
1004 private_child_sa_t *this;
1005
1006 INIT(this,
1007 .public = {
1008 .get_name = _get_name,
1009 .get_reqid = _get_reqid,
1010 .get_config = _get_config,
1011 .get_state = _get_state,
1012 .set_state = _set_state,
1013 .get_spi = _get_spi,
1014 .get_cpi = _get_cpi,
1015 .get_protocol = _get_protocol,
1016 .set_protocol = _set_protocol,
1017 .get_mode = _get_mode,
1018 .set_mode = _set_mode,
1019 .get_proposal = _get_proposal,
1020 .set_proposal = _set_proposal,
1021 .get_lifetime = _get_lifetime,
1022 .get_usestats = _get_usestats,
1023 .has_encap = _has_encap,
1024 .get_ipcomp = _get_ipcomp,
1025 .set_ipcomp = _set_ipcomp,
1026 .get_close_action = _get_close_action,
1027 .set_close_action = _set_close_action,
1028 .get_dpd_action = _get_dpd_action,
1029 .set_dpd_action = _set_dpd_action,
1030 .alloc_spi = _alloc_spi,
1031 .alloc_cpi = _alloc_cpi,
1032 .install = _install,
1033 .update = _update,
1034 .add_policies = _add_policies,
1035 .get_traffic_selectors = _get_traffic_selectors,
1036 .create_policy_enumerator = _create_policy_enumerator,
1037 .destroy = _destroy,
1038 },
1039 .my_addr = me->clone(me),
1040 .other_addr = other->clone(other),
1041 .encap = encap,
1042 .ipcomp = IPCOMP_NONE,
1043 .state = CHILD_CREATED,
1044 .my_ts = linked_list_create(),
1045 .other_ts = linked_list_create(),
1046 .protocol = PROTO_NONE,
1047 .mode = MODE_TUNNEL,
1048 .close_action = config->get_close_action(config),
1049 .dpd_action = config->get_dpd_action(config),
1050 .reqid = config->get_reqid(config),
1051 .mark_in = config->get_mark(config, TRUE),
1052 .mark_out = config->get_mark(config, FALSE),
1053 );
1054
1055 this->config = config;
1056 config->get_ref(config);
1057
1058 if (!this->reqid)
1059 {
1060 /* reuse old reqid if we are rekeying an existing CHILD_SA */
1061 this->reqid = rekey ? rekey : ++reqid;
1062 }
1063
1064 /* MIPv6 proxy transport mode sets SA endpoints to TS hosts */
1065 if (config->get_mode(config) == MODE_TRANSPORT &&
1066 config->use_proxy_mode(config))
1067 {
1068 ts_type_t type;
1069 int family;
1070 chunk_t addr;
1071 host_t *host;
1072 enumerator_t *enumerator;
1073 linked_list_t *my_ts_list, *other_ts_list;
1074 traffic_selector_t *my_ts, *other_ts;
1075
1076 this->mode = MODE_TRANSPORT;
1077
1078 my_ts_list = config->get_traffic_selectors(config, TRUE, NULL, me);
1079 enumerator = my_ts_list->create_enumerator(my_ts_list);
1080 if (enumerator->enumerate(enumerator, &my_ts))
1081 {
1082 if (my_ts->is_host(my_ts, NULL) &&
1083 !my_ts->is_host(my_ts, this->my_addr))
1084 {
1085 type = my_ts->get_type(my_ts);
1086 family = (type == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
1087 addr = my_ts->get_from_address(my_ts);
1088 host = host_create_from_chunk(family, addr, 0);
1089 free(addr.ptr);
1090 DBG1(DBG_CHD, "my address: %H is a transport mode proxy for %H",
1091 this->my_addr, host);
1092 this->my_addr->destroy(this->my_addr);
1093 this->my_addr = host;
1094 }
1095 }
1096 enumerator->destroy(enumerator);
1097 my_ts_list->destroy_offset(my_ts_list, offsetof(traffic_selector_t, destroy));
1098
1099 other_ts_list = config->get_traffic_selectors(config, FALSE, NULL, other);
1100 enumerator = other_ts_list->create_enumerator(other_ts_list);
1101 if (enumerator->enumerate(enumerator, &other_ts))
1102 {
1103 if (other_ts->is_host(other_ts, NULL) &&
1104 !other_ts->is_host(other_ts, this->other_addr))
1105 {
1106 type = other_ts->get_type(other_ts);
1107 family = (type == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
1108 addr = other_ts->get_from_address(other_ts);
1109 host = host_create_from_chunk(family, addr, 0);
1110 free(addr.ptr);
1111 DBG1(DBG_CHD, "other address: %H is a transport mode proxy for %H",
1112 this->other_addr, host);
1113 this->other_addr->destroy(this->other_addr);
1114 this->other_addr = host;
1115 }
1116 }
1117 enumerator->destroy(enumerator);
1118 other_ts_list->destroy_offset(other_ts_list, offsetof(traffic_selector_t, destroy));
1119 }
1120
1121 return &this->public;
1122 }