Added a TFC padding option to child_cfg
[strongswan.git] / src / libcharon / sa / child_sa.c
1 /*
2 * Copyright (C) 2006-2010 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, 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 traffic_selector_t *src_ts = NULL, *dst_ts = NULL;
567 time_t now;
568 lifetime_cfg_t *lifetime;
569 u_int32_t tfc = 0;
570 host_t *src, *dst;
571 status_t status;
572 bool update = FALSE;
573
574 /* now we have to decide which spi to use. Use self allocated, if "in",
575 * or the one in the proposal, if not "in" (others). Additionally,
576 * source and dest host switch depending on the role */
577 if (inbound)
578 {
579 dst = this->my_addr;
580 src = this->other_addr;
581 if (this->my_spi == spi)
582 { /* alloc_spi has been called, do an SA update */
583 update = TRUE;
584 }
585 this->my_spi = spi;
586 this->my_cpi = cpi;
587 }
588 else
589 {
590 src = this->my_addr;
591 dst = this->other_addr;
592 this->other_spi = spi;
593 this->other_cpi = cpi;
594
595 tfc = this->config->get_tfc(this->config);
596 }
597
598 DBG2(DBG_CHD, "adding %s %N SA", inbound ? "inbound" : "outbound",
599 protocol_id_names, this->protocol);
600
601 /* send SA down to the kernel */
602 DBG2(DBG_CHD, " SPI 0x%.8x, src %H dst %H", ntohl(spi), src, dst);
603
604 this->proposal->get_algorithm(this->proposal, ENCRYPTION_ALGORITHM,
605 &enc_alg, &size);
606 this->proposal->get_algorithm(this->proposal, INTEGRITY_ALGORITHM,
607 &int_alg, &size);
608
609 lifetime = this->config->get_lifetime(this->config);
610
611 now = time_monotonic(NULL);
612 if (lifetime->time.rekey)
613 {
614 this->rekey_time = now + lifetime->time.rekey;
615 }
616 if (lifetime->time.life)
617 {
618 this->expire_time = now + lifetime->time.life;
619 }
620
621 if (!lifetime->time.jitter && !inbound)
622 { /* avoid triggering multiple rekey events */
623 lifetime->time.rekey = 0;
624 }
625
626 if (this->mode == MODE_BEET || this->mode == MODE_TRANSPORT)
627 {
628 /* BEET requires the bound address from the traffic selectors.
629 * TODO: We add just the first traffic selector for now, as the
630 * kernel accepts a single TS per SA only */
631 if (inbound)
632 {
633 my_ts->get_first(my_ts, (void**)&dst_ts);
634 other_ts->get_first(other_ts, (void**)&src_ts);
635 }
636 else
637 {
638 my_ts->get_first(my_ts, (void**)&src_ts);
639 other_ts->get_first(other_ts, (void**)&dst_ts);
640 }
641 }
642
643 status = hydra->kernel_interface->add_sa(hydra->kernel_interface,
644 src, dst, spi, proto_ike2ip(this->protocol), this->reqid,
645 inbound ? this->mark_in : this->mark_out, tfc,
646 lifetime, enc_alg, encr, int_alg, integ, this->mode,
647 this->ipcomp, cpi, this->encap, update, src_ts, dst_ts);
648
649 free(lifetime);
650
651 return status;
652 }
653
654 METHOD(child_sa_t, add_policies, status_t,
655 private_child_sa_t *this, linked_list_t *my_ts_list,
656 linked_list_t *other_ts_list)
657 {
658 enumerator_t *enumerator;
659 traffic_selector_t *my_ts, *other_ts;
660 status_t status = SUCCESS;
661 bool routed = (this->state == CHILD_CREATED);
662
663 /* apply traffic selectors */
664 enumerator = my_ts_list->create_enumerator(my_ts_list);
665 while (enumerator->enumerate(enumerator, &my_ts))
666 {
667 this->my_ts->insert_last(this->my_ts, my_ts->clone(my_ts));
668 }
669 enumerator->destroy(enumerator);
670 enumerator = other_ts_list->create_enumerator(other_ts_list);
671 while (enumerator->enumerate(enumerator, &other_ts))
672 {
673 this->other_ts->insert_last(this->other_ts, other_ts->clone(other_ts));
674 }
675 enumerator->destroy(enumerator);
676
677 if (this->config->install_policy(this->config))
678 {
679 ipsec_sa_cfg_t my_sa = {
680 .mode = this->mode,
681 .reqid = this->reqid,
682 .ipcomp = {
683 .transform = this->ipcomp,
684 },
685 }, other_sa = my_sa;
686
687 my_sa.ipcomp.cpi = this->my_cpi;
688 other_sa.ipcomp.cpi = this->other_cpi;
689
690 if (this->protocol == PROTO_ESP)
691 {
692 my_sa.esp.use = TRUE;
693 my_sa.esp.spi = this->my_spi;
694 other_sa.esp.use = TRUE;
695 other_sa.esp.spi = this->other_spi;
696 }
697 else
698 {
699 my_sa.ah.use = TRUE;
700 my_sa.ah.spi = this->my_spi;
701 other_sa.ah.use = TRUE;
702 other_sa.ah.spi = this->other_spi;
703 }
704
705 /* enumerate pairs of traffic selectors */
706 enumerator = create_policy_enumerator(this);
707 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
708 {
709 /* install 3 policies: out, in and forward */
710 status |= hydra->kernel_interface->add_policy(
711 hydra->kernel_interface,
712 this->my_addr, this->other_addr, my_ts, other_ts,
713 POLICY_OUT, POLICY_IPSEC, &other_sa,
714 this->mark_out, routed);
715
716 status |= hydra->kernel_interface->add_policy(
717 hydra->kernel_interface,
718 this->other_addr, this->my_addr, other_ts, my_ts,
719 POLICY_IN, POLICY_IPSEC, &my_sa,
720 this->mark_in, routed);
721 if (this->mode != MODE_TRANSPORT)
722 {
723 status |= hydra->kernel_interface->add_policy(
724 hydra->kernel_interface,
725 this->other_addr, this->my_addr, other_ts, my_ts,
726 POLICY_FWD, POLICY_IPSEC, &my_sa,
727 this->mark_in, routed);
728 }
729
730 if (status != SUCCESS)
731 {
732 break;
733 }
734 }
735 enumerator->destroy(enumerator);
736 }
737
738 if (status == SUCCESS && this->state == CHILD_CREATED)
739 { /* switch to routed state if no SAD entry set up */
740 set_state(this, CHILD_ROUTED);
741 }
742 return status;
743 }
744
745 METHOD(child_sa_t, update, status_t,
746 private_child_sa_t *this, host_t *me, host_t *other, host_t *vip,
747 bool encap)
748 {
749 child_sa_state_t old;
750 bool transport_proxy_mode;
751
752 /* anything changed at all? */
753 if (me->equals(me, this->my_addr) &&
754 other->equals(other, this->other_addr) && this->encap == encap)
755 {
756 return SUCCESS;
757 }
758
759 old = this->state;
760 set_state(this, CHILD_UPDATING);
761 transport_proxy_mode = this->config->use_proxy_mode(this->config) &&
762 this->mode == MODE_TRANSPORT;
763
764 if (!transport_proxy_mode)
765 {
766 /* update our (initator) SA */
767 if (this->my_spi)
768 {
769 if (hydra->kernel_interface->update_sa(hydra->kernel_interface,
770 this->my_spi, proto_ike2ip(this->protocol),
771 this->ipcomp != IPCOMP_NONE ? this->my_cpi : 0,
772 this->other_addr, this->my_addr, other, me,
773 this->encap, encap, this->mark_in) == NOT_SUPPORTED)
774 {
775 return NOT_SUPPORTED;
776 }
777 }
778
779 /* update his (responder) SA */
780 if (this->other_spi)
781 {
782 if (hydra->kernel_interface->update_sa(hydra->kernel_interface,
783 this->other_spi, proto_ike2ip(this->protocol),
784 this->ipcomp != IPCOMP_NONE ? this->other_cpi : 0,
785 this->my_addr, this->other_addr, me, other,
786 this->encap, encap, this->mark_out) == NOT_SUPPORTED)
787 {
788 return NOT_SUPPORTED;
789 }
790 }
791 }
792
793 if (this->config->install_policy(this->config))
794 {
795 ipsec_sa_cfg_t my_sa = {
796 .mode = this->mode,
797 .reqid = this->reqid,
798 .ipcomp = {
799 .transform = this->ipcomp,
800 },
801 }, other_sa = my_sa;
802
803 my_sa.ipcomp.cpi = this->my_cpi;
804 other_sa.ipcomp.cpi = this->other_cpi;
805
806 if (this->protocol == PROTO_ESP)
807 {
808 my_sa.esp.use = TRUE;
809 my_sa.esp.spi = this->my_spi;
810 other_sa.esp.use = TRUE;
811 other_sa.esp.spi = this->other_spi;
812 }
813 else
814 {
815 my_sa.ah.use = TRUE;
816 my_sa.ah.spi = this->my_spi;
817 other_sa.ah.use = TRUE;
818 other_sa.ah.spi = this->other_spi;
819 }
820
821 /* update policies */
822 if (!me->ip_equals(me, this->my_addr) ||
823 !other->ip_equals(other, this->other_addr))
824 {
825 enumerator_t *enumerator;
826 traffic_selector_t *my_ts, *other_ts;
827
828 /* always use high priorities, as hosts getting updated are INSTALLED */
829 enumerator = create_policy_enumerator(this);
830 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
831 {
832 /* remove old policies first */
833 hydra->kernel_interface->del_policy(hydra->kernel_interface,
834 my_ts, other_ts, POLICY_OUT, this->mark_out, FALSE);
835 hydra->kernel_interface->del_policy(hydra->kernel_interface,
836 other_ts, my_ts, POLICY_IN, this->mark_in, FALSE);
837 if (this->mode != MODE_TRANSPORT)
838 {
839 hydra->kernel_interface->del_policy(hydra->kernel_interface,
840 other_ts, my_ts, POLICY_FWD, this->mark_in, FALSE);
841 }
842
843 /* check whether we have to update a "dynamic" traffic selector */
844 if (!me->ip_equals(me, this->my_addr) &&
845 my_ts->is_host(my_ts, this->my_addr))
846 {
847 my_ts->set_address(my_ts, me);
848 }
849 if (!other->ip_equals(other, this->other_addr) &&
850 other_ts->is_host(other_ts, this->other_addr))
851 {
852 other_ts->set_address(other_ts, other);
853 }
854
855 /* we reinstall the virtual IP to handle interface roaming
856 * correctly */
857 if (vip)
858 {
859 hydra->kernel_interface->del_ip(hydra->kernel_interface, vip);
860 hydra->kernel_interface->add_ip(hydra->kernel_interface, vip, me);
861 }
862
863 /* reinstall updated policies */
864 hydra->kernel_interface->add_policy(hydra->kernel_interface,
865 me, other, my_ts, other_ts, POLICY_OUT, POLICY_IPSEC,
866 &other_sa, this->mark_out, FALSE);
867 hydra->kernel_interface->add_policy(hydra->kernel_interface,
868 other, me, other_ts, my_ts, POLICY_IN, POLICY_IPSEC,
869 &my_sa, this->mark_in, FALSE);
870 if (this->mode != MODE_TRANSPORT)
871 {
872 hydra->kernel_interface->add_policy(hydra->kernel_interface,
873 other, me, other_ts, my_ts, POLICY_FWD, POLICY_IPSEC,
874 &my_sa, this->mark_in, FALSE);
875 }
876 }
877 enumerator->destroy(enumerator);
878 }
879 }
880
881 if (!transport_proxy_mode)
882 {
883 /* apply hosts */
884 if (!me->equals(me, this->my_addr))
885 {
886 this->my_addr->destroy(this->my_addr);
887 this->my_addr = me->clone(me);
888 }
889 if (!other->equals(other, this->other_addr))
890 {
891 this->other_addr->destroy(this->other_addr);
892 this->other_addr = other->clone(other);
893 }
894 }
895
896 this->encap = encap;
897 set_state(this, old);
898
899 return SUCCESS;
900 }
901
902 METHOD(child_sa_t, destroy, void,
903 private_child_sa_t *this)
904 {
905 enumerator_t *enumerator;
906 traffic_selector_t *my_ts, *other_ts;
907 bool unrouted = (this->state == CHILD_ROUTED);
908
909 set_state(this, CHILD_DESTROYING);
910
911 /* delete SAs in the kernel, if they are set up */
912 if (this->my_spi)
913 {
914 /* if CHILD was not established, use PROTO_ESP used during alloc_spi().
915 * TODO: For AH support, we have to store protocol specific SPI.s */
916 if (this->protocol == PROTO_NONE)
917 {
918 this->protocol = PROTO_ESP;
919 }
920 hydra->kernel_interface->del_sa(hydra->kernel_interface,
921 this->other_addr, this->my_addr, this->my_spi,
922 proto_ike2ip(this->protocol), this->my_cpi,
923 this->mark_in);
924 }
925 if (this->other_spi)
926 {
927 hydra->kernel_interface->del_sa(hydra->kernel_interface,
928 this->my_addr, this->other_addr, this->other_spi,
929 proto_ike2ip(this->protocol), this->other_cpi,
930 this->mark_out);
931 }
932
933 if (this->config->install_policy(this->config))
934 {
935 /* delete all policies in the kernel */
936 enumerator = create_policy_enumerator(this);
937 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
938 {
939 hydra->kernel_interface->del_policy(hydra->kernel_interface,
940 my_ts, other_ts, POLICY_OUT, this->mark_out, unrouted);
941 hydra->kernel_interface->del_policy(hydra->kernel_interface,
942 other_ts, my_ts, POLICY_IN, this->mark_in, unrouted);
943 if (this->mode != MODE_TRANSPORT)
944 {
945 hydra->kernel_interface->del_policy(hydra->kernel_interface,
946 other_ts, my_ts, POLICY_FWD, this->mark_in, unrouted);
947 }
948 }
949 enumerator->destroy(enumerator);
950 }
951
952 this->my_ts->destroy_offset(this->my_ts, offsetof(traffic_selector_t, destroy));
953 this->other_ts->destroy_offset(this->other_ts, offsetof(traffic_selector_t, destroy));
954 this->my_addr->destroy(this->my_addr);
955 this->other_addr->destroy(this->other_addr);
956 DESTROY_IF(this->proposal);
957 this->config->destroy(this->config);
958 free(this);
959 }
960
961 /**
962 * Described in header.
963 */
964 child_sa_t * child_sa_create(host_t *me, host_t* other,
965 child_cfg_t *config, u_int32_t rekey, bool encap)
966 {
967 static u_int32_t reqid = 0;
968 private_child_sa_t *this;
969
970 INIT(this,
971 .public = {
972 .get_name = _get_name,
973 .get_reqid = _get_reqid,
974 .get_config = _get_config,
975 .get_state = _get_state,
976 .set_state = _set_state,
977 .get_spi = _get_spi,
978 .get_cpi = _get_cpi,
979 .get_protocol = _get_protocol,
980 .set_protocol = _set_protocol,
981 .get_mode = _get_mode,
982 .set_mode = _set_mode,
983 .get_proposal = _get_proposal,
984 .set_proposal = _set_proposal,
985 .get_lifetime = _get_lifetime,
986 .get_usestats = _get_usestats,
987 .has_encap = _has_encap,
988 .get_ipcomp = _get_ipcomp,
989 .set_ipcomp = _set_ipcomp,
990 .get_close_action = _get_close_action,
991 .set_close_action = _set_close_action,
992 .get_dpd_action = _get_dpd_action,
993 .set_dpd_action = _set_dpd_action,
994 .alloc_spi = _alloc_spi,
995 .alloc_cpi = _alloc_cpi,
996 .install = _install,
997 .update = _update,
998 .add_policies = _add_policies,
999 .get_traffic_selectors = _get_traffic_selectors,
1000 .create_policy_enumerator = _create_policy_enumerator,
1001 .destroy = _destroy,
1002 },
1003 .my_addr = me->clone(me),
1004 .other_addr = other->clone(other),
1005 .encap = encap,
1006 .ipcomp = IPCOMP_NONE,
1007 .state = CHILD_CREATED,
1008 .my_ts = linked_list_create(),
1009 .other_ts = linked_list_create(),
1010 .protocol = PROTO_NONE,
1011 .mode = MODE_TUNNEL,
1012 .close_action = config->get_close_action(config),
1013 .dpd_action = config->get_dpd_action(config),
1014 .reqid = config->get_reqid(config),
1015 .mark_in = config->get_mark(config, TRUE),
1016 .mark_out = config->get_mark(config, FALSE),
1017 );
1018
1019 this->config = config;
1020 config->get_ref(config);
1021
1022 if (!this->reqid)
1023 {
1024 /* reuse old reqid if we are rekeying an existing CHILD_SA */
1025 this->reqid = rekey ? rekey : ++reqid;
1026 }
1027
1028 /* MIPv6 proxy transport mode sets SA endpoints to TS hosts */
1029 if (config->get_mode(config) == MODE_TRANSPORT &&
1030 config->use_proxy_mode(config))
1031 {
1032 ts_type_t type;
1033 int family;
1034 chunk_t addr;
1035 host_t *host;
1036 enumerator_t *enumerator;
1037 linked_list_t *my_ts_list, *other_ts_list;
1038 traffic_selector_t *my_ts, *other_ts;
1039
1040 this->mode = MODE_TRANSPORT;
1041
1042 my_ts_list = config->get_traffic_selectors(config, TRUE, NULL, me);
1043 enumerator = my_ts_list->create_enumerator(my_ts_list);
1044 if (enumerator->enumerate(enumerator, &my_ts))
1045 {
1046 if (my_ts->is_host(my_ts, NULL) &&
1047 !my_ts->is_host(my_ts, this->my_addr))
1048 {
1049 type = my_ts->get_type(my_ts);
1050 family = (type == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
1051 addr = my_ts->get_from_address(my_ts);
1052 host = host_create_from_chunk(family, addr, 0);
1053 free(addr.ptr);
1054 DBG1(DBG_CHD, "my address: %H is a transport mode proxy for %H",
1055 this->my_addr, host);
1056 this->my_addr->destroy(this->my_addr);
1057 this->my_addr = host;
1058 }
1059 }
1060 enumerator->destroy(enumerator);
1061 my_ts_list->destroy_offset(my_ts_list, offsetof(traffic_selector_t, destroy));
1062
1063 other_ts_list = config->get_traffic_selectors(config, FALSE, NULL, other);
1064 enumerator = other_ts_list->create_enumerator(other_ts_list);
1065 if (enumerator->enumerate(enumerator, &other_ts))
1066 {
1067 if (other_ts->is_host(other_ts, NULL) &&
1068 !other_ts->is_host(other_ts, this->other_addr))
1069 {
1070 type = other_ts->get_type(other_ts);
1071 family = (type == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
1072 addr = other_ts->get_from_address(other_ts);
1073 host = host_create_from_chunk(family, addr, 0);
1074 free(addr.ptr);
1075 DBG1(DBG_CHD, "other address: %H is a transport mode proxy for %H",
1076 this->other_addr, host);
1077 this->other_addr->destroy(this->other_addr);
1078 this->other_addr = host;
1079 }
1080 }
1081 enumerator->destroy(enumerator);
1082 other_ts_list->destroy_offset(other_ts_list, offsetof(traffic_selector_t, destroy));
1083 }
1084
1085 return &this->public;
1086 }