e316a50557f7fb58902bb725b93fdbf8198de50a
[strongswan.git] / src / charon / sa / child_sa.c
1 /*
2 * Copyright (C) 2006-2008 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 * Implementation of child_sa_t.get_usetime
379 */
380 static u_int32_t get_usetime(private_child_sa_t *this, bool inbound)
381 {
382 enumerator_t *enumerator;
383 traffic_selector_t *my_ts, *other_ts;
384 u_int32_t last_use = 0;
385
386 enumerator = create_policy_enumerator(this);
387 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
388 {
389 u_int32_t in, out, fwd;
390
391 if (inbound)
392 {
393 if (charon->kernel_interface->query_policy(charon->kernel_interface,
394 other_ts, my_ts, POLICY_IN, &in) == SUCCESS)
395 {
396 last_use = max(last_use, in);
397 }
398 if (this->mode != MODE_TRANSPORT)
399 {
400 if (charon->kernel_interface->query_policy(charon->kernel_interface,
401 other_ts, my_ts, POLICY_FWD, &fwd) == SUCCESS)
402 {
403 last_use = max(last_use, fwd);
404 }
405 }
406 }
407 else
408 {
409 if (charon->kernel_interface->query_policy(charon->kernel_interface,
410 my_ts, other_ts, POLICY_OUT, &out) == SUCCESS)
411 {
412 last_use = max(last_use, out);
413 }
414 }
415 }
416 enumerator->destroy(enumerator);
417 if (inbound)
418 {
419 this->my_usetime = last_use;
420 }
421 else
422 {
423 this->other_usetime = last_use;
424 }
425 return last_use;
426 }
427
428 /**
429 * Implementation of child_sa_t.get_usebytes
430 */
431 static u_int64_t get_usebytes(private_child_sa_t *this, bool inbound)
432 {
433 status_t status;
434 u_int64_t bytes;
435
436 if (inbound)
437 {
438 if (this->my_spi)
439 {
440 status = charon->kernel_interface->query_sa(charon->kernel_interface,
441 this->other_addr, this->my_addr,
442 this->my_spi, this->protocol, &bytes);
443 if (status == SUCCESS && bytes > this->my_usebytes)
444 {
445 this->my_usebytes = bytes;
446 }
447 }
448 return this->my_usebytes;
449 }
450 else
451 {
452 if (this->other_spi)
453 {
454 status = charon->kernel_interface->query_sa(charon->kernel_interface,
455 this->my_addr, this->other_addr,
456 this->other_spi, this->protocol, &bytes);
457 if (status == SUCCESS && bytes > this->other_usebytes)
458 {
459 this->other_usebytes = bytes;
460 }
461 }
462 return this->other_usebytes;
463 }
464 }
465
466 /**
467 * Implementation of child_sa_t.get_lifetime
468 */
469 static u_int32_t get_lifetime(private_child_sa_t *this, bool hard)
470 {
471 return hard ? this->expire_time : this->rekey_time;
472 }
473
474 /**
475 * Implementation of child_sa_t.alloc_spi
476 */
477 static u_int32_t alloc_spi(private_child_sa_t *this, protocol_id_t protocol)
478 {
479 if (charon->kernel_interface->get_spi(charon->kernel_interface,
480 this->other_addr, this->my_addr, protocol,
481 this->reqid, &this->my_spi) == SUCCESS)
482 {
483 return this->my_spi;
484 }
485 return 0;
486 }
487
488 /**
489 * Implementation of child_sa_t.alloc_cpi
490 */
491 static u_int16_t alloc_cpi(private_child_sa_t *this)
492 {
493 if (charon->kernel_interface->get_cpi(charon->kernel_interface,
494 this->other_addr, this->my_addr, this->reqid,
495 &this->my_cpi) == SUCCESS)
496 {
497 return this->my_cpi;
498 }
499 return 0;
500 }
501
502 /**
503 * Implementation of child_sa_t.install
504 */
505 static status_t install(private_child_sa_t *this, chunk_t encr, chunk_t integ,
506 u_int32_t spi, u_int16_t cpi, bool inbound)
507 {
508 u_int16_t enc_alg = ENCR_UNDEFINED, int_alg = AUTH_UNDEFINED, size;
509 u_int32_t soft, hard, now;
510 host_t *src, *dst;
511 status_t status;
512 bool update = FALSE;
513
514 /* now we have to decide which spi to use. Use self allocated, if "in",
515 * or the one in the proposal, if not "in" (others). Additionally,
516 * source and dest host switch depending on the role */
517 if (inbound)
518 {
519 dst = this->my_addr;
520 src = this->other_addr;
521 if (this->my_spi == spi)
522 { /* alloc_spi has been called, do an SA update */
523 update = TRUE;
524 }
525 this->my_spi = spi;
526 this->my_cpi = cpi;
527 }
528 else
529 {
530 src = this->my_addr;
531 dst = this->other_addr;
532 this->other_spi = spi;
533 this->other_cpi = cpi;
534 }
535
536 DBG2(DBG_CHD, "adding %s %N SA", inbound ? "inbound" : "outbound",
537 protocol_id_names, this->protocol);
538
539 /* send SA down to the kernel */
540 DBG2(DBG_CHD, " SPI 0x%.8x, src %H dst %H", ntohl(spi), src, dst);
541
542 this->proposal->get_algorithm(this->proposal, ENCRYPTION_ALGORITHM,
543 &enc_alg, &size);
544 this->proposal->get_algorithm(this->proposal, INTEGRITY_ALGORITHM,
545 &int_alg, &size);
546
547 soft = this->config->get_lifetime(this->config, TRUE);
548 hard = this->config->get_lifetime(this->config, FALSE);
549
550 status = charon->kernel_interface->add_sa(charon->kernel_interface,
551 src, dst, spi, this->protocol, this->reqid,
552 inbound ? soft : 0, hard, enc_alg, encr, int_alg, integ,
553 this->mode, this->ipcomp, cpi, this->encap, update);
554
555 now = time(NULL);
556 if (soft)
557 {
558 this->rekey_time = now + soft;
559 }
560 if (hard)
561 {
562 this->expire_time = now + hard;
563 }
564 return status;
565 }
566
567 /**
568 * Implementation of child_sa_t.add_policies
569 */
570 static status_t add_policies(private_child_sa_t *this,
571 linked_list_t *my_ts_list, linked_list_t *other_ts_list)
572 {
573 enumerator_t *enumerator;
574 traffic_selector_t *my_ts, *other_ts;
575 status_t status = SUCCESS;
576 bool routed = (this->state == CHILD_CREATED);
577
578 /* apply traffic selectors */
579 enumerator = my_ts_list->create_enumerator(my_ts_list);
580 while (enumerator->enumerate(enumerator, &my_ts))
581 {
582 this->my_ts->insert_last(this->my_ts, my_ts->clone(my_ts));
583 }
584 enumerator->destroy(enumerator);
585 enumerator = other_ts_list->create_enumerator(other_ts_list);
586 while (enumerator->enumerate(enumerator, &other_ts))
587 {
588 this->other_ts->insert_last(this->other_ts, other_ts->clone(other_ts));
589 }
590 enumerator->destroy(enumerator);
591
592 if (this->config->install_policy(this->config))
593 {
594 /* enumerate pairs of traffic selectors */
595 enumerator = create_policy_enumerator(this);
596 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
597 {
598 /* install 3 policies: out, in and forward */
599 status |= charon->kernel_interface->add_policy(charon->kernel_interface,
600 this->my_addr, this->other_addr, my_ts, other_ts, POLICY_OUT,
601 this->other_spi, this->protocol, this->reqid, this->mode,
602 this->ipcomp, this->other_cpi, routed);
603
604 status |= charon->kernel_interface->add_policy(charon->kernel_interface,
605 this->other_addr, this->my_addr, other_ts, my_ts, POLICY_IN,
606 this->my_spi, this->protocol, this->reqid, this->mode,
607 this->ipcomp, this->my_cpi, routed);
608 if (this->mode != MODE_TRANSPORT)
609 {
610 status |= charon->kernel_interface->add_policy(charon->kernel_interface,
611 this->other_addr, this->my_addr, other_ts, my_ts, POLICY_FWD,
612 this->my_spi, this->protocol, this->reqid, this->mode,
613 this->ipcomp, this->my_cpi, routed);
614 }
615
616 if (status != SUCCESS)
617 {
618 break;
619 }
620 }
621 enumerator->destroy(enumerator);
622 }
623
624 if (status == SUCCESS && this->state == CHILD_CREATED)
625 { /* switch to routed state if no SAD entry set up */
626 set_state(this, CHILD_ROUTED);
627 }
628 return status;
629 }
630
631 /**
632 * Implementation of child_sa_t.update.
633 */
634 static status_t update(private_child_sa_t *this, host_t *me, host_t *other,
635 host_t *vip, bool encap)
636 {
637 child_sa_state_t old;
638 bool transport_proxy_mode;
639
640 /* anything changed at all? */
641 if (me->equals(me, this->my_addr) &&
642 other->equals(other, this->other_addr) && this->encap == encap)
643 {
644 return SUCCESS;
645 }
646
647 old = this->state;
648 set_state(this, CHILD_UPDATING);
649 transport_proxy_mode = this->config->use_proxy_mode(this->config) &&
650 this->mode == MODE_TRANSPORT;
651
652 if (!transport_proxy_mode)
653 {
654 /* update our (initator) SA */
655 if (this->my_spi)
656 {
657 if (charon->kernel_interface->update_sa(charon->kernel_interface,
658 this->my_spi, this->protocol,
659 this->ipcomp != IPCOMP_NONE ? this->my_cpi : 0,
660 this->other_addr, this->my_addr, other, me,
661 this->encap, encap) == NOT_SUPPORTED)
662 {
663 return NOT_SUPPORTED;
664 }
665 }
666
667 /* update his (responder) SA */
668 if (this->other_spi)
669 {
670 if (charon->kernel_interface->update_sa(charon->kernel_interface,
671 this->other_spi, this->protocol,
672 this->ipcomp != IPCOMP_NONE ? this->other_cpi : 0,
673 this->my_addr, this->other_addr, me, other,
674 this->encap, encap) == NOT_SUPPORTED)
675 {
676 return NOT_SUPPORTED;
677 }
678 }
679 }
680
681 if (this->config->install_policy(this->config))
682 {
683 /* update policies */
684 if (!me->ip_equals(me, this->my_addr) ||
685 !other->ip_equals(other, this->other_addr))
686 {
687 enumerator_t *enumerator;
688 traffic_selector_t *my_ts, *other_ts;
689
690 /* always use high priorities, as hosts getting updated are INSTALLED */
691 enumerator = create_policy_enumerator(this);
692 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
693 {
694 /* remove old policies first */
695 charon->kernel_interface->del_policy(charon->kernel_interface,
696 my_ts, other_ts, POLICY_OUT, FALSE);
697 charon->kernel_interface->del_policy(charon->kernel_interface,
698 other_ts, my_ts, POLICY_IN, FALSE);
699 if (this->mode != MODE_TRANSPORT)
700 {
701 charon->kernel_interface->del_policy(charon->kernel_interface,
702 other_ts, my_ts, POLICY_FWD, FALSE);
703 }
704
705 /* check whether we have to update a "dynamic" traffic selector */
706 if (!me->ip_equals(me, this->my_addr) &&
707 my_ts->is_host(my_ts, this->my_addr))
708 {
709 my_ts->set_address(my_ts, me);
710 }
711 if (!other->ip_equals(other, this->other_addr) &&
712 other_ts->is_host(other_ts, this->other_addr))
713 {
714 other_ts->set_address(other_ts, other);
715 }
716
717 /* we reinstall the virtual IP to handle interface roaming
718 * correctly */
719 if (vip)
720 {
721 charon->kernel_interface->del_ip(charon->kernel_interface, vip);
722 charon->kernel_interface->add_ip(charon->kernel_interface, vip, me);
723 }
724
725 /* reinstall updated policies */
726 charon->kernel_interface->add_policy(charon->kernel_interface,
727 me, other, my_ts, other_ts, POLICY_OUT, this->other_spi,
728 this->protocol, this->reqid, this->mode, this->ipcomp,
729 this->other_cpi, FALSE);
730 charon->kernel_interface->add_policy(charon->kernel_interface,
731 other, me, other_ts, my_ts, POLICY_IN, this->my_spi,
732 this->protocol, this->reqid, this->mode, this->ipcomp,
733 this->my_cpi, FALSE);
734 if (this->mode != MODE_TRANSPORT)
735 {
736 charon->kernel_interface->add_policy(charon->kernel_interface,
737 other, me, other_ts, my_ts, POLICY_FWD, this->my_spi,
738 this->protocol, this->reqid, this->mode, this->ipcomp,
739 this->my_cpi, FALSE);
740 }
741 }
742 enumerator->destroy(enumerator);
743 }
744 }
745
746 if (!transport_proxy_mode)
747 {
748 /* apply hosts */
749 if (!me->equals(me, this->my_addr))
750 {
751 this->my_addr->destroy(this->my_addr);
752 this->my_addr = me->clone(me);
753 }
754 if (!other->equals(other, this->other_addr))
755 {
756 this->other_addr->destroy(this->other_addr);
757 this->other_addr = other->clone(other);
758 }
759 }
760
761 this->encap = encap;
762 set_state(this, old);
763
764 return SUCCESS;
765 }
766
767 /**
768 * Implementation of child_sa_t.destroy.
769 */
770 static void destroy(private_child_sa_t *this)
771 {
772 enumerator_t *enumerator;
773 traffic_selector_t *my_ts, *other_ts;
774 bool unrouted = (this->state == CHILD_ROUTED);
775
776 set_state(this, CHILD_DESTROYING);
777
778 /* delete SAs in the kernel, if they are set up */
779 if (this->my_spi)
780 {
781 charon->kernel_interface->del_sa(charon->kernel_interface,
782 this->other_addr, this->my_addr, this->my_spi,
783 this->protocol, this->my_cpi);
784 }
785 if (this->other_spi)
786 {
787 charon->kernel_interface->del_sa(charon->kernel_interface,
788 this->my_addr, this->other_addr, this->other_spi,
789 this->protocol, this->other_cpi);
790 }
791
792 if (this->config->install_policy(this->config))
793 {
794 /* delete all policies in the kernel */
795 enumerator = create_policy_enumerator(this);
796 while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
797 {
798 charon->kernel_interface->del_policy(charon->kernel_interface,
799 my_ts, other_ts, POLICY_OUT, unrouted);
800 charon->kernel_interface->del_policy(charon->kernel_interface,
801 other_ts, my_ts, POLICY_IN, unrouted);
802 if (this->mode != MODE_TRANSPORT)
803 {
804 charon->kernel_interface->del_policy(charon->kernel_interface,
805 other_ts, my_ts, POLICY_FWD, unrouted);
806 }
807 }
808 enumerator->destroy(enumerator);
809 }
810
811 this->my_ts->destroy_offset(this->my_ts, offsetof(traffic_selector_t, destroy));
812 this->other_ts->destroy_offset(this->other_ts, offsetof(traffic_selector_t, destroy));
813 this->my_addr->destroy(this->my_addr);
814 this->other_addr->destroy(this->other_addr);
815 DESTROY_IF(this->proposal);
816 this->config->destroy(this->config);
817 free(this);
818 }
819
820 /*
821 * Described in header.
822 */
823 child_sa_t * child_sa_create(host_t *me, host_t* other,
824 child_cfg_t *config, u_int32_t rekey, bool encap)
825 {
826 static u_int32_t reqid = 0;
827 private_child_sa_t *this = malloc_thing(private_child_sa_t);
828
829 /* public functions */
830 this->public.get_name = (char*(*)(child_sa_t*))get_name;
831 this->public.get_reqid = (u_int32_t(*)(child_sa_t*))get_reqid;
832 this->public.get_config = (child_cfg_t*(*)(child_sa_t*))get_config;
833 this->public.get_state = (child_sa_state_t(*)(child_sa_t*))get_state;
834 this->public.set_state = (void(*)(child_sa_t*,child_sa_state_t))set_state;
835 this->public.get_spi = (u_int32_t(*)(child_sa_t*, bool))get_spi;
836 this->public.get_cpi = (u_int16_t(*)(child_sa_t*, bool))get_cpi;
837 this->public.get_protocol = (protocol_id_t(*)(child_sa_t*))get_protocol;
838 this->public.set_protocol = (void(*)(child_sa_t*, protocol_id_t protocol))set_protocol;
839 this->public.get_mode = (ipsec_mode_t(*)(child_sa_t*))get_mode;
840 this->public.set_mode = (void(*)(child_sa_t*, ipsec_mode_t mode))set_mode;
841 this->public.get_proposal = (proposal_t*(*)(child_sa_t*))get_proposal;
842 this->public.set_proposal = (void(*)(child_sa_t*, proposal_t *proposal))set_proposal;
843 this->public.get_lifetime = (u_int32_t(*)(child_sa_t*, bool))get_lifetime;
844 this->public.get_usetime = (u_int32_t(*)(child_sa_t*, bool))get_usetime;
845 this->public.get_usebytes = (u_int64_t(*)(child_sa_t*, bool))get_usebytes;
846 this->public.has_encap = (bool(*)(child_sa_t*))has_encap;
847 this->public.get_ipcomp = (ipcomp_transform_t(*)(child_sa_t*))get_ipcomp;
848 this->public.set_ipcomp = (void(*)(child_sa_t*,ipcomp_transform_t))set_ipcomp;
849 this->public.alloc_spi = (u_int32_t(*)(child_sa_t*, protocol_id_t protocol))alloc_spi;
850 this->public.alloc_cpi = (u_int16_t(*)(child_sa_t*))alloc_cpi;
851 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;
852 this->public.update = (status_t (*)(child_sa_t*,host_t*,host_t*,host_t*,bool))update;
853 this->public.add_policies = (status_t (*)(child_sa_t*, linked_list_t*,linked_list_t*))add_policies;
854 this->public.get_traffic_selectors = (linked_list_t*(*)(child_sa_t*,bool))get_traffic_selectors;
855 this->public.create_policy_enumerator = (enumerator_t*(*)(child_sa_t*))create_policy_enumerator;
856 this->public.destroy = (void(*)(child_sa_t*))destroy;
857
858 /* private data */
859 this->my_addr = me->clone(me);
860 this->other_addr = other->clone(other);
861 this->my_spi = 0;
862 this->other_spi = 0;
863 this->my_cpi = 0;
864 this->other_cpi = 0;
865 this->encap = encap;
866 this->ipcomp = IPCOMP_NONE;
867 this->state = CHILD_CREATED;
868 this->my_usetime = 0;
869 this->other_usetime = 0;
870 this->my_usebytes = 0;
871 this->other_usebytes = 0;
872 /* reuse old reqid if we are rekeying an existing CHILD_SA */
873 this->reqid = rekey ? rekey : ++reqid;
874 this->my_ts = linked_list_create();
875 this->other_ts = linked_list_create();
876 this->protocol = PROTO_NONE;
877 this->mode = MODE_TUNNEL;
878 this->proposal = NULL;
879 this->rekey_time = 0;
880 this->expire_time = 0;
881 this->config = config;
882 config->get_ref(config);
883
884 /* MIPv6 proxy transport mode sets SA endpoints to TS hosts */
885 if (config->get_mode(config) == MODE_TRANSPORT &&
886 config->use_proxy_mode(config))
887 {
888 ts_type_t type;
889 int family;
890 chunk_t addr;
891 host_t *host;
892 enumerator_t *enumerator;
893 linked_list_t *my_ts_list, *other_ts_list;
894 traffic_selector_t *my_ts, *other_ts;
895
896 this->mode = MODE_TRANSPORT;
897
898 my_ts_list = config->get_traffic_selectors(config, TRUE, NULL, me);
899 enumerator = my_ts_list->create_enumerator(my_ts_list);
900 if (enumerator->enumerate(enumerator, &my_ts))
901 {
902 if (my_ts->is_host(my_ts, NULL) &&
903 !my_ts->is_host(my_ts, this->my_addr))
904 {
905 type = my_ts->get_type(my_ts);
906 family = (type == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
907 addr = my_ts->get_from_address(my_ts);
908 host = host_create_from_chunk(family, addr, 0);
909 free(addr.ptr);
910 DBG1(DBG_CHD, "my address: %H is a transport mode proxy for %H",
911 this->my_addr, host);
912 this->my_addr->destroy(this->my_addr);
913 this->my_addr = host;
914 }
915 }
916 enumerator->destroy(enumerator);
917 my_ts_list->destroy_offset(my_ts_list, offsetof(traffic_selector_t, destroy));
918
919 other_ts_list = config->get_traffic_selectors(config, FALSE, NULL, other);
920 enumerator = other_ts_list->create_enumerator(other_ts_list);
921 if (enumerator->enumerate(enumerator, &other_ts))
922 {
923 if (other_ts->is_host(other_ts, NULL) &&
924 !other_ts->is_host(other_ts, this->other_addr))
925 {
926 type = other_ts->get_type(other_ts);
927 family = (type == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
928 addr = other_ts->get_from_address(other_ts);
929 host = host_create_from_chunk(family, addr, 0);
930 free(addr.ptr);
931 DBG1(DBG_CHD, "other address: %H is a transport mode proxy for %H",
932 this->other_addr, host);
933 this->other_addr->destroy(this->other_addr);
934 this->other_addr = host;
935 }
936 }
937 enumerator->destroy(enumerator);
938 other_ts_list->destroy_offset(other_ts_list, offsetof(traffic_selector_t, destroy));
939 }
940
941 return &this->public;
942 }