kernel-pfkey: Don't update during add_sa(), but delete SPI allocation state
[strongswan.git] / src / libhydra / plugins / kernel_pfkey / kernel_pfkey_ipsec.c
1 /*
2 * Copyright (C) 2008-2012 Tobias Brunner
3 * Copyright (C) 2008 Andreas Steffen
4 * Hochschule fuer Technik Rapperswil
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 */
16 /*
17 * Copyright (C) 2014 Nanoteq Pty Ltd
18 *
19 * Permission is hereby granted, free of charge, to any person obtaining a copy
20 * of this software and associated documentation files (the "Software"), to deal
21 * in the Software without restriction, including without limitation the rights
22 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
23 * copies of the Software, and to permit persons to whom the Software is
24 * furnished to do so, subject to the following conditions:
25 *
26 * The above copyright notice and this permission notice shall be included in
27 * all copies or substantial portions of the Software.
28 *
29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
30 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
31 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
32 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
33 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
34 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
35 * THE SOFTWARE.
36 */
37
38 #include <stdint.h>
39 #include <sys/types.h>
40 #include <sys/socket.h>
41
42 #ifdef __FreeBSD__
43 #include <limits.h> /* for LONG_MAX */
44 #endif
45
46 #ifdef HAVE_NET_PFKEYV2_H
47 #include <net/pfkeyv2.h>
48 #else
49 #include <linux/pfkeyv2.h>
50 #endif
51
52 #ifdef SADB_X_EXT_NAT_T_TYPE
53 #define HAVE_NATT
54 #endif
55
56 #ifdef HAVE_NETIPSEC_IPSEC_H
57 #include <netipsec/ipsec.h>
58 #elif defined(HAVE_NETINET6_IPSEC_H)
59 #include <netinet6/ipsec.h>
60 #else
61 #include <linux/ipsec.h>
62 #endif
63
64 #ifdef HAVE_NATT
65 #ifdef HAVE_LINUX_UDP_H
66 #include <linux/udp.h>
67 #else
68 #include <netinet/udp.h>
69 #endif /*HAVE_LINUX_UDP_H*/
70 #endif /*HAVE_NATT*/
71
72 #include <unistd.h>
73 #include <time.h>
74 #include <errno.h>
75 #ifdef __APPLE__
76 #include <sys/sysctl.h>
77 #endif
78
79 #include "kernel_pfkey_ipsec.h"
80
81 #include <hydra.h>
82 #include <utils/debug.h>
83 #include <networking/host.h>
84 #include <collections/linked_list.h>
85 #include <collections/hashtable.h>
86 #include <threading/mutex.h>
87
88 /** non linux specific */
89 #ifndef IPPROTO_COMP
90 #ifdef IPPROTO_IPCOMP
91 #define IPPROTO_COMP IPPROTO_IPCOMP
92 #endif
93 #endif
94
95 #ifndef SADB_X_AALG_SHA2_256HMAC
96 #define SADB_X_AALG_SHA2_256HMAC SADB_X_AALG_SHA2_256
97 #define SADB_X_AALG_SHA2_384HMAC SADB_X_AALG_SHA2_384
98 #define SADB_X_AALG_SHA2_512HMAC SADB_X_AALG_SHA2_512
99 #endif
100
101 #ifndef SADB_X_EALG_AESCBC
102 #define SADB_X_EALG_AESCBC SADB_X_EALG_AES
103 #endif
104
105 #ifndef SADB_X_EALG_CASTCBC
106 #define SADB_X_EALG_CASTCBC SADB_X_EALG_CAST128CBC
107 #endif
108
109 #ifndef SOL_IP
110 #define SOL_IP IPPROTO_IP
111 #define SOL_IPV6 IPPROTO_IPV6
112 #endif
113
114 /** from linux/in.h */
115 #ifndef IP_IPSEC_POLICY
116 #define IP_IPSEC_POLICY 16
117 #endif
118
119 /** missing on uclibc */
120 #ifndef IPV6_IPSEC_POLICY
121 #define IPV6_IPSEC_POLICY 34
122 #endif
123
124 /* from linux/udp.h */
125 #ifndef UDP_ENCAP
126 #define UDP_ENCAP 100
127 #endif
128
129 #ifndef UDP_ENCAP_ESPINUDP
130 #define UDP_ENCAP_ESPINUDP 2
131 #endif
132
133 /* this is not defined on some platforms */
134 #ifndef SOL_UDP
135 #define SOL_UDP IPPROTO_UDP
136 #endif
137
138 /** base priority for installed policies */
139 #define PRIO_BASE 384
140
141 #ifdef __APPLE__
142 /** from xnu/bsd/net/pfkeyv2.h */
143 #define SADB_X_EXT_NATT 0x002
144 struct sadb_sa_2 {
145 struct sadb_sa sa;
146 u_int16_t sadb_sa_natt_port;
147 u_int16_t sadb_reserved0;
148 u_int32_t sadb_reserved1;
149 };
150 #endif
151
152 /** buffer size for PF_KEY messages */
153 #define PFKEY_BUFFER_SIZE 4096
154
155 /** PF_KEY messages are 64 bit aligned */
156 #define PFKEY_ALIGNMENT 8
157 /** aligns len to 64 bits */
158 #define PFKEY_ALIGN(len) (((len) + PFKEY_ALIGNMENT - 1) & ~(PFKEY_ALIGNMENT - 1))
159 /** calculates the properly padded length in 64 bit chunks */
160 #define PFKEY_LEN(len) ((PFKEY_ALIGN(len) / PFKEY_ALIGNMENT))
161 /** calculates user mode length i.e. in bytes */
162 #define PFKEY_USER_LEN(len) ((len) * PFKEY_ALIGNMENT)
163
164 /** given a PF_KEY message header and an extension this updates the length in the header */
165 #define PFKEY_EXT_ADD(msg, ext) ((msg)->sadb_msg_len += ((struct sadb_ext*)ext)->sadb_ext_len)
166 /** given a PF_KEY message header this returns a pointer to the next extension */
167 #define PFKEY_EXT_ADD_NEXT(msg) ((struct sadb_ext*)(((char*)(msg)) + PFKEY_USER_LEN((msg)->sadb_msg_len)))
168 /** copy an extension and append it to a PF_KEY message */
169 #define PFKEY_EXT_COPY(msg, ext) (PFKEY_EXT_ADD(msg, memcpy(PFKEY_EXT_ADD_NEXT(msg), ext, PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len))))
170 /** given a PF_KEY extension this returns a pointer to the next extension */
171 #define PFKEY_EXT_NEXT(ext) ((struct sadb_ext*)(((char*)(ext)) + PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len)))
172 /** given a PF_KEY extension this returns a pointer to the next extension also updates len (len in 64 bit words) */
173 #define PFKEY_EXT_NEXT_LEN(ext,len) ((len) -= (ext)->sadb_ext_len, PFKEY_EXT_NEXT(ext))
174 /** true if ext has a valid length and len is large enough to contain ext (assuming len in 64 bit words) */
175 #define PFKEY_EXT_OK(ext,len) ((len) >= PFKEY_LEN(sizeof(struct sadb_ext)) && \
176 (ext)->sadb_ext_len >= PFKEY_LEN(sizeof(struct sadb_ext)) && \
177 (ext)->sadb_ext_len <= (len))
178
179 typedef struct private_kernel_pfkey_ipsec_t private_kernel_pfkey_ipsec_t;
180
181 /**
182 * Private variables and functions of kernel_pfkey class.
183 */
184 struct private_kernel_pfkey_ipsec_t
185 {
186 /**
187 * Public part of the kernel_pfkey_t object.
188 */
189 kernel_pfkey_ipsec_t public;
190
191 /**
192 * mutex to lock access to various lists
193 */
194 mutex_t *mutex;
195
196 /**
197 * List of installed policies (policy_entry_t)
198 */
199 linked_list_t *policies;
200
201 /**
202 * List of exclude routes (exclude_route_t)
203 */
204 linked_list_t *excludes;
205
206 /**
207 * Hash table of IPsec SAs using policies (ipsec_sa_t)
208 */
209 hashtable_t *sas;
210
211 /**
212 * whether to install routes along policies
213 */
214 bool install_routes;
215
216 /**
217 * mutex to lock access to the PF_KEY socket
218 */
219 mutex_t *mutex_pfkey;
220
221 /**
222 * PF_KEY socket to communicate with the kernel
223 */
224 int socket;
225
226 /**
227 * PF_KEY socket to receive acquire and expire events
228 */
229 int socket_events;
230
231 /**
232 * sequence number for messages sent to the kernel
233 */
234 int seq;
235 };
236
237 typedef struct exclude_route_t exclude_route_t;
238
239 /**
240 * Exclude route definition
241 */
242 struct exclude_route_t {
243 /** destination address of exclude */
244 host_t *dst;
245 /** source address for route */
246 host_t *src;
247 /** nexthop exclude has been installed */
248 host_t *gtw;
249 /** references to this route */
250 int refs;
251 };
252
253 /**
254 * clean up a route exclude entry
255 */
256 static void exclude_route_destroy(exclude_route_t *this)
257 {
258 this->dst->destroy(this->dst);
259 this->src->destroy(this->src);
260 this->gtw->destroy(this->gtw);
261 free(this);
262 }
263
264 typedef struct route_entry_t route_entry_t;
265
266 /**
267 * installed routing entry
268 */
269 struct route_entry_t {
270 /** name of the interface the route is bound to */
271 char *if_name;
272
273 /** source ip of the route */
274 host_t *src_ip;
275
276 /** gateway for this route */
277 host_t *gateway;
278
279 /** destination net */
280 chunk_t dst_net;
281
282 /** destination net prefixlen */
283 u_int8_t prefixlen;
284
285 /** reference to exclude route, if any */
286 exclude_route_t *exclude;
287 };
288
289 /**
290 * destroy an route_entry_t object
291 */
292 static void route_entry_destroy(route_entry_t *this)
293 {
294 free(this->if_name);
295 DESTROY_IF(this->src_ip);
296 DESTROY_IF(this->gateway);
297 chunk_free(&this->dst_net);
298 free(this);
299 }
300
301 /**
302 * compare two route_entry_t objects
303 */
304 static bool route_entry_equals(route_entry_t *a, route_entry_t *b)
305 {
306 return a->if_name && b->if_name && streq(a->if_name, b->if_name) &&
307 a->src_ip->ip_equals(a->src_ip, b->src_ip) &&
308 a->gateway && b->gateway &&
309 a->gateway->ip_equals(a->gateway, b->gateway) &&
310 chunk_equals(a->dst_net, b->dst_net) && a->prefixlen == b->prefixlen;
311 }
312
313 typedef struct ipsec_sa_t ipsec_sa_t;
314
315 /**
316 * IPsec SA assigned to a policy.
317 */
318 struct ipsec_sa_t {
319 /** Source address of this SA */
320 host_t *src;
321
322 /** Destination address of this SA */
323 host_t *dst;
324
325 /** Description of this SA */
326 ipsec_sa_cfg_t cfg;
327
328 /** Reference count for this SA */
329 refcount_t refcount;
330 };
331
332 /**
333 * Hash function for ipsec_sa_t objects
334 */
335 static u_int ipsec_sa_hash(ipsec_sa_t *sa)
336 {
337 return chunk_hash_inc(sa->src->get_address(sa->src),
338 chunk_hash_inc(sa->dst->get_address(sa->dst),
339 chunk_hash(chunk_from_thing(sa->cfg))));
340 }
341
342 /**
343 * Equality function for ipsec_sa_t objects
344 */
345 static bool ipsec_sa_equals(ipsec_sa_t *sa, ipsec_sa_t *other_sa)
346 {
347 return sa->src->ip_equals(sa->src, other_sa->src) &&
348 sa->dst->ip_equals(sa->dst, other_sa->dst) &&
349 memeq(&sa->cfg, &other_sa->cfg, sizeof(ipsec_sa_cfg_t));
350 }
351
352 /**
353 * Allocate or reference an IPsec SA object
354 */
355 static ipsec_sa_t *ipsec_sa_create(private_kernel_pfkey_ipsec_t *this,
356 host_t *src, host_t *dst,
357 ipsec_sa_cfg_t *cfg)
358 {
359 ipsec_sa_t *sa, *found;
360 INIT(sa,
361 .src = src,
362 .dst = dst,
363 .cfg = *cfg,
364 );
365 found = this->sas->get(this->sas, sa);
366 if (!found)
367 {
368 sa->src = src->clone(src);
369 sa->dst = dst->clone(dst);
370 this->sas->put(this->sas, sa, sa);
371 }
372 else
373 {
374 free(sa);
375 sa = found;
376 }
377 ref_get(&sa->refcount);
378 return sa;
379 }
380
381 /**
382 * Release and destroy an IPsec SA object
383 */
384 static void ipsec_sa_destroy(private_kernel_pfkey_ipsec_t *this,
385 ipsec_sa_t *sa)
386 {
387 if (ref_put(&sa->refcount))
388 {
389 this->sas->remove(this->sas, sa);
390 DESTROY_IF(sa->src);
391 DESTROY_IF(sa->dst);
392 free(sa);
393 }
394 }
395
396 typedef struct policy_sa_t policy_sa_t;
397 typedef struct policy_sa_in_t policy_sa_in_t;
398
399 /**
400 * Mapping between a policy and an IPsec SA.
401 */
402 struct policy_sa_t {
403 /** Priority assigned to the policy when installed with this SA */
404 u_int32_t priority;
405
406 /** Type of the policy */
407 policy_type_t type;
408
409 /** Assigned SA */
410 ipsec_sa_t *sa;
411 };
412
413 /**
414 * For input policies we also cache the traffic selectors in order to install
415 * the route.
416 */
417 struct policy_sa_in_t {
418 /** Generic interface */
419 policy_sa_t generic;
420
421 /** Source traffic selector of this policy */
422 traffic_selector_t *src_ts;
423
424 /** Destination traffic selector of this policy */
425 traffic_selector_t *dst_ts;
426 };
427
428 /**
429 * Create a policy_sa(_in)_t object
430 */
431 static policy_sa_t *policy_sa_create(private_kernel_pfkey_ipsec_t *this,
432 policy_dir_t dir, policy_type_t type, host_t *src, host_t *dst,
433 traffic_selector_t *src_ts, traffic_selector_t *dst_ts, ipsec_sa_cfg_t *cfg)
434 {
435 policy_sa_t *policy;
436
437 if (dir == POLICY_IN)
438 {
439 policy_sa_in_t *in;
440 INIT(in,
441 .src_ts = src_ts->clone(src_ts),
442 .dst_ts = dst_ts->clone(dst_ts),
443 );
444 policy = &in->generic;
445 }
446 else
447 {
448 INIT(policy, .priority = 0);
449 }
450 policy->type = type;
451 policy->sa = ipsec_sa_create(this, src, dst, cfg);
452 return policy;
453 }
454
455 /**
456 * Destroy a policy_sa(_in)_t object
457 */
458 static void policy_sa_destroy(policy_sa_t *policy, policy_dir_t *dir,
459 private_kernel_pfkey_ipsec_t *this)
460 {
461 if (*dir == POLICY_IN)
462 {
463 policy_sa_in_t *in = (policy_sa_in_t*)policy;
464 in->src_ts->destroy(in->src_ts);
465 in->dst_ts->destroy(in->dst_ts);
466 }
467 ipsec_sa_destroy(this, policy->sa);
468 free(policy);
469 }
470
471 typedef struct policy_entry_t policy_entry_t;
472
473 /**
474 * installed kernel policy.
475 */
476 struct policy_entry_t {
477 /** Index assigned by the kernel */
478 u_int32_t index;
479
480 /** Direction of this policy: in, out, forward */
481 u_int8_t direction;
482
483 /** Parameters of installed policy */
484 struct {
485 /** Subnet and port */
486 host_t *net;
487 /** Subnet mask */
488 u_int8_t mask;
489 /** Protocol */
490 u_int8_t proto;
491 } src, dst;
492
493 /** Associated route installed for this policy */
494 route_entry_t *route;
495
496 /** List of SAs this policy is used by, ordered by priority */
497 linked_list_t *used_by;
498 };
499
500 /**
501 * Create a policy_entry_t object
502 */
503 static policy_entry_t *create_policy_entry(traffic_selector_t *src_ts,
504 traffic_selector_t *dst_ts,
505 policy_dir_t dir)
506 {
507 policy_entry_t *policy;
508 INIT(policy,
509 .direction = dir,
510 );
511
512 src_ts->to_subnet(src_ts, &policy->src.net, &policy->src.mask);
513 dst_ts->to_subnet(dst_ts, &policy->dst.net, &policy->dst.mask);
514
515 /* src or dest proto may be "any" (0), use more restrictive one */
516 policy->src.proto = max(src_ts->get_protocol(src_ts),
517 dst_ts->get_protocol(dst_ts));
518 policy->src.proto = policy->src.proto ? policy->src.proto : IPSEC_PROTO_ANY;
519 policy->dst.proto = policy->src.proto;
520
521 return policy;
522 }
523
524 /**
525 * Destroy a policy_entry_t object
526 */
527 static void policy_entry_destroy(policy_entry_t *policy,
528 private_kernel_pfkey_ipsec_t *this)
529 {
530 if (policy->route)
531 {
532 route_entry_destroy(policy->route);
533 }
534 if (policy->used_by)
535 {
536 policy->used_by->invoke_function(policy->used_by,
537 (linked_list_invoke_t)policy_sa_destroy,
538 &policy->direction, this);
539 policy->used_by->destroy(policy->used_by);
540 }
541 DESTROY_IF(policy->src.net);
542 DESTROY_IF(policy->dst.net);
543 free(policy);
544 }
545
546 /**
547 * compares two policy_entry_t
548 */
549 static inline bool policy_entry_equals(policy_entry_t *current,
550 policy_entry_t *policy)
551 {
552 return current->direction == policy->direction &&
553 current->src.proto == policy->src.proto &&
554 current->dst.proto == policy->dst.proto &&
555 current->src.mask == policy->src.mask &&
556 current->dst.mask == policy->dst.mask &&
557 current->src.net->equals(current->src.net, policy->src.net) &&
558 current->dst.net->equals(current->dst.net, policy->dst.net);
559 }
560
561 /**
562 * compare the given kernel index with that of a policy
563 */
564 static inline bool policy_entry_match_byindex(policy_entry_t *current,
565 u_int32_t *index)
566 {
567 return current->index == *index;
568 }
569
570 /**
571 * Calculate the priority of a policy
572 */
573 static inline u_int32_t get_priority(policy_entry_t *policy,
574 policy_priority_t prio)
575 {
576 u_int32_t priority = PRIO_BASE;
577 switch (prio)
578 {
579 case POLICY_PRIORITY_FALLBACK:
580 priority <<= 1;
581 /* fall-through */
582 case POLICY_PRIORITY_ROUTED:
583 priority <<= 1;
584 /* fall-through */
585 case POLICY_PRIORITY_DEFAULT:
586 priority <<= 1;
587 /* fall-trough */
588 case POLICY_PRIORITY_PASS:
589 break;
590 }
591 /* calculate priority based on selector size, small size = high prio */
592 priority -= policy->src.mask;
593 priority -= policy->dst.mask;
594 priority <<= 2; /* make some room for the two flags */
595 priority += policy->src.net->get_port(policy->src.net) ||
596 policy->dst.net->get_port(policy->dst.net) ?
597 0 : 2;
598 priority += policy->src.proto != IPSEC_PROTO_ANY ? 0 : 1;
599 return priority;
600 }
601
602 typedef struct pfkey_msg_t pfkey_msg_t;
603
604 struct pfkey_msg_t
605 {
606 /**
607 * PF_KEY message base
608 */
609 struct sadb_msg *msg;
610
611 /**
612 * PF_KEY message extensions
613 */
614 union {
615 struct sadb_ext *ext[SADB_EXT_MAX + 1];
616 struct {
617 struct sadb_ext *reserved; /* SADB_EXT_RESERVED */
618 struct sadb_sa *sa; /* SADB_EXT_SA */
619 struct sadb_lifetime *lft_current; /* SADB_EXT_LIFETIME_CURRENT */
620 struct sadb_lifetime *lft_hard; /* SADB_EXT_LIFETIME_HARD */
621 struct sadb_lifetime *lft_soft; /* SADB_EXT_LIFETIME_SOFT */
622 struct sadb_address *src; /* SADB_EXT_ADDRESS_SRC */
623 struct sadb_address *dst; /* SADB_EXT_ADDRESS_DST */
624 struct sadb_address *proxy; /* SADB_EXT_ADDRESS_PROXY */
625 struct sadb_key *key_auth; /* SADB_EXT_KEY_AUTH */
626 struct sadb_key *key_encr; /* SADB_EXT_KEY_ENCRYPT */
627 struct sadb_ident *id_src; /* SADB_EXT_IDENTITY_SRC */
628 struct sadb_ident *id_dst; /* SADB_EXT_IDENTITY_DST */
629 struct sadb_sens *sensitivity; /* SADB_EXT_SENSITIVITY */
630 struct sadb_prop *proposal; /* SADB_EXT_PROPOSAL */
631 struct sadb_supported *supported_auth; /* SADB_EXT_SUPPORTED_AUTH */
632 struct sadb_supported *supported_encr; /* SADB_EXT_SUPPORTED_ENCRYPT */
633 struct sadb_spirange *spirange; /* SADB_EXT_SPIRANGE */
634 struct sadb_x_kmprivate *x_kmprivate; /* SADB_X_EXT_KMPRIVATE */
635 struct sadb_x_policy *x_policy; /* SADB_X_EXT_POLICY */
636 struct sadb_x_sa2 *x_sa2; /* SADB_X_EXT_SA2 */
637 struct sadb_x_nat_t_type *x_natt_type; /* SADB_X_EXT_NAT_T_TYPE */
638 struct sadb_x_nat_t_port *x_natt_sport; /* SADB_X_EXT_NAT_T_SPORT */
639 struct sadb_x_nat_t_port *x_natt_dport; /* SADB_X_EXT_NAT_T_DPORT */
640 struct sadb_address *x_natt_oa; /* SADB_X_EXT_NAT_T_OA */
641 struct sadb_x_sec_ctx *x_sec_ctx; /* SADB_X_EXT_SEC_CTX */
642 struct sadb_x_kmaddress *x_kmaddress; /* SADB_X_EXT_KMADDRESS */
643 } __attribute__((__packed__));
644 };
645 };
646
647 ENUM(sadb_ext_type_names, SADB_EXT_RESERVED, SADB_EXT_MAX,
648 "SADB_EXT_RESERVED",
649 "SADB_EXT_SA",
650 "SADB_EXT_LIFETIME_CURRENT",
651 "SADB_EXT_LIFETIME_HARD",
652 "SADB_EXT_LIFETIME_SOFT",
653 "SADB_EXT_ADDRESS_SRC",
654 "SADB_EXT_ADDRESS_DST",
655 "SADB_EXT_ADDRESS_PROXY",
656 "SADB_EXT_KEY_AUTH",
657 "SADB_EXT_KEY_ENCRYPT",
658 "SADB_EXT_IDENTITY_SRC",
659 "SADB_EXT_IDENTITY_DST",
660 "SADB_EXT_SENSITIVITY",
661 "SADB_EXT_PROPOSAL",
662 "SADB_EXT_SUPPORTED_AUTH",
663 "SADB_EXT_SUPPORTED_ENCRYPT",
664 "SADB_EXT_SPIRANGE",
665 "SADB_X_EXT_KMPRIVATE",
666 "SADB_X_EXT_POLICY",
667 "SADB_X_EXT_SA2",
668 "SADB_X_EXT_NAT_T_TYPE",
669 "SADB_X_EXT_NAT_T_SPORT",
670 "SADB_X_EXT_NAT_T_DPORT",
671 "SADB_X_EXT_NAT_T_OA",
672 "SADB_X_EXT_SEC_CTX",
673 "SADB_X_EXT_KMADDRESS"
674 );
675
676 /**
677 * convert a protocol identifier to the PF_KEY sa type
678 */
679 static u_int8_t proto2satype(u_int8_t proto)
680 {
681 switch (proto)
682 {
683 case IPPROTO_ESP:
684 return SADB_SATYPE_ESP;
685 case IPPROTO_AH:
686 return SADB_SATYPE_AH;
687 case IPPROTO_COMP:
688 return SADB_X_SATYPE_IPCOMP;
689 default:
690 return proto;
691 }
692 }
693
694 /**
695 * convert a PF_KEY sa type to a protocol identifier
696 */
697 static u_int8_t satype2proto(u_int8_t satype)
698 {
699 switch (satype)
700 {
701 case SADB_SATYPE_ESP:
702 return IPPROTO_ESP;
703 case SADB_SATYPE_AH:
704 return IPPROTO_AH;
705 case SADB_X_SATYPE_IPCOMP:
706 return IPPROTO_COMP;
707 default:
708 return satype;
709 }
710 }
711
712 /**
713 * convert the general ipsec mode to the one defined in ipsec.h
714 */
715 static u_int8_t mode2kernel(ipsec_mode_t mode)
716 {
717 switch (mode)
718 {
719 case MODE_TRANSPORT:
720 return IPSEC_MODE_TRANSPORT;
721 case MODE_TUNNEL:
722 return IPSEC_MODE_TUNNEL;
723 #ifdef HAVE_IPSEC_MODE_BEET
724 case MODE_BEET:
725 return IPSEC_MODE_BEET;
726 #endif
727 default:
728 return mode;
729 }
730 }
731
732 /**
733 * convert the general policy direction to the one defined in ipsec.h
734 */
735 static u_int8_t dir2kernel(policy_dir_t dir)
736 {
737 switch (dir)
738 {
739 case POLICY_IN:
740 return IPSEC_DIR_INBOUND;
741 case POLICY_OUT:
742 return IPSEC_DIR_OUTBOUND;
743 #ifdef HAVE_IPSEC_DIR_FWD
744 case POLICY_FWD:
745 return IPSEC_DIR_FWD;
746 #endif
747 default:
748 return IPSEC_DIR_INVALID;
749 }
750 }
751
752 /**
753 * convert the policy type to the one defined in ipsec.h
754 */
755 static inline u_int16_t type2kernel(policy_type_t type)
756 {
757 switch (type)
758 {
759 case POLICY_IPSEC:
760 return IPSEC_POLICY_IPSEC;
761 case POLICY_PASS:
762 return IPSEC_POLICY_NONE;
763 case POLICY_DROP:
764 return IPSEC_POLICY_DISCARD;
765 }
766 return type;
767 }
768
769 #ifdef SADB_X_MIGRATE
770 /**
771 * convert the policy direction in ipsec.h to the general one.
772 */
773 static policy_dir_t kernel2dir(u_int8_t dir)
774 {
775 switch (dir)
776 {
777 case IPSEC_DIR_INBOUND:
778 return POLICY_IN;
779 case IPSEC_DIR_OUTBOUND:
780 return POLICY_OUT;
781 #ifdef HAVE_IPSEC_DIR_FWD
782 case IPSEC_DIR_FWD:
783 return POLICY_FWD;
784 #endif
785 default:
786 return dir;
787 }
788 }
789 #endif /*SADB_X_MIGRATE*/
790
791 typedef struct kernel_algorithm_t kernel_algorithm_t;
792
793 /**
794 * Mapping of IKEv2 algorithms to PF_KEY algorithms
795 */
796 struct kernel_algorithm_t {
797 /**
798 * Identifier specified in IKEv2
799 */
800 int ikev2;
801
802 /**
803 * Identifier as defined in pfkeyv2.h
804 */
805 int kernel;
806 };
807
808 #define END_OF_LIST -1
809
810 /**
811 * Algorithms for encryption
812 */
813 static kernel_algorithm_t encryption_algs[] = {
814 /* {ENCR_DES_IV64, 0 }, */
815 {ENCR_DES, SADB_EALG_DESCBC },
816 {ENCR_3DES, SADB_EALG_3DESCBC },
817 /* {ENCR_RC5, 0 }, */
818 /* {ENCR_IDEA, 0 }, */
819 {ENCR_CAST, SADB_X_EALG_CASTCBC },
820 {ENCR_BLOWFISH, SADB_X_EALG_BLOWFISHCBC },
821 /* {ENCR_3IDEA, 0 }, */
822 /* {ENCR_DES_IV32, 0 }, */
823 {ENCR_NULL, SADB_EALG_NULL },
824 {ENCR_AES_CBC, SADB_X_EALG_AESCBC },
825 /* {ENCR_AES_CTR, SADB_X_EALG_AESCTR }, */
826 /* {ENCR_AES_CCM_ICV8, SADB_X_EALG_AES_CCM_ICV8 }, */
827 /* {ENCR_AES_CCM_ICV12, SADB_X_EALG_AES_CCM_ICV12 }, */
828 /* {ENCR_AES_CCM_ICV16, SADB_X_EALG_AES_CCM_ICV16 }, */
829 /* {ENCR_AES_GCM_ICV8, SADB_X_EALG_AES_GCM_ICV8 }, */
830 /* {ENCR_AES_GCM_ICV12, SADB_X_EALG_AES_GCM_ICV12 }, */
831 /* {ENCR_AES_GCM_ICV16, SADB_X_EALG_AES_GCM_ICV16 }, */
832 {END_OF_LIST, 0 },
833 };
834
835 /**
836 * Algorithms for integrity protection
837 */
838 static kernel_algorithm_t integrity_algs[] = {
839 {AUTH_HMAC_MD5_96, SADB_AALG_MD5HMAC },
840 {AUTH_HMAC_SHA1_96, SADB_AALG_SHA1HMAC },
841 {AUTH_HMAC_SHA2_256_128, SADB_X_AALG_SHA2_256HMAC },
842 {AUTH_HMAC_SHA2_384_192, SADB_X_AALG_SHA2_384HMAC },
843 {AUTH_HMAC_SHA2_512_256, SADB_X_AALG_SHA2_512HMAC },
844 /* {AUTH_DES_MAC, 0, }, */
845 /* {AUTH_KPDK_MD5, 0, }, */
846 #ifdef SADB_X_AALG_AES_XCBC_MAC
847 {AUTH_AES_XCBC_96, SADB_X_AALG_AES_XCBC_MAC, },
848 #endif
849 {END_OF_LIST, 0, },
850 };
851
852 /**
853 * Algorithms for IPComp, unused yet
854 */
855 static kernel_algorithm_t compression_algs[] = {
856 /* {IPCOMP_OUI, 0 }, */
857 {IPCOMP_DEFLATE, SADB_X_CALG_DEFLATE },
858 #ifdef SADB_X_CALG_LZS
859 {IPCOMP_LZS, SADB_X_CALG_LZS },
860 #endif
861 #ifdef SADB_X_CALG_LZJH
862 {IPCOMP_LZJH, SADB_X_CALG_LZJH },
863 #endif
864 {END_OF_LIST, 0 },
865 };
866
867 /**
868 * Look up a kernel algorithm ID and its key size
869 */
870 static int lookup_algorithm(transform_type_t type, int ikev2)
871 {
872 kernel_algorithm_t *list;
873 u_int16_t alg = 0;
874
875 switch (type)
876 {
877 case ENCRYPTION_ALGORITHM:
878 list = encryption_algs;
879 break;
880 case INTEGRITY_ALGORITHM:
881 list = integrity_algs;
882 break;
883 case COMPRESSION_ALGORITHM:
884 list = compression_algs;
885 break;
886 default:
887 return 0;
888 }
889 while (list->ikev2 != END_OF_LIST)
890 {
891 if (ikev2 == list->ikev2)
892 {
893 return list->kernel;
894 }
895 list++;
896 }
897 hydra->kernel_interface->lookup_algorithm(hydra->kernel_interface, ikev2,
898 type, &alg, NULL);
899 return alg;
900 }
901
902 /**
903 * Helper to set a port in a sockaddr_t, the port has to be in host order
904 */
905 static void set_port(sockaddr_t *addr, u_int16_t port)
906 {
907 switch (addr->sa_family)
908 {
909 case AF_INET:
910 {
911 struct sockaddr_in *sin = (struct sockaddr_in*)addr;
912 sin->sin_port = htons(port);
913 break;
914 }
915 case AF_INET6:
916 {
917 struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)addr;
918 sin6->sin6_port = htons(port);
919 break;
920 }
921 }
922 }
923
924 /**
925 * Copy a host_t as sockaddr_t to the given memory location.
926 * @return the number of bytes copied
927 */
928 static size_t hostcpy(void *dest, host_t *host, bool include_port)
929 {
930 sockaddr_t *addr = host->get_sockaddr(host), *dest_addr = dest;
931 socklen_t *len = host->get_sockaddr_len(host);
932
933 memcpy(dest, addr, *len);
934 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
935 dest_addr->sa_len = *len;
936 #endif
937 if (!include_port)
938 {
939 set_port(dest_addr, 0);
940 }
941 return *len;
942 }
943
944 /**
945 * Copy a host_t as sockaddr_t to the given memory location and map the port to
946 * ICMP/ICMPv6 message type/code as the Linux kernel expects it, that is, the
947 * type in the source and the code in the destination address.
948 * @return the number of bytes copied
949 */
950 static size_t hostcpy_icmp(void *dest, host_t *host, u_int16_t type)
951 {
952 size_t len;
953
954 len = hostcpy(dest, host, TRUE);
955 if (type == SADB_EXT_ADDRESS_SRC)
956 {
957 set_port(dest, traffic_selector_icmp_type(host->get_port(host)));
958 }
959 else
960 {
961 set_port(dest, traffic_selector_icmp_code(host->get_port(host)));
962 }
963 return len;
964 }
965
966 /**
967 * add a host to the given sadb_msg
968 */
969 static void add_addr_ext(struct sadb_msg *msg, host_t *host, u_int16_t type,
970 u_int8_t proto, u_int8_t prefixlen, bool include_port)
971 {
972 struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg);
973 size_t len;
974
975 addr->sadb_address_exttype = type;
976 addr->sadb_address_proto = proto;
977 addr->sadb_address_prefixlen = prefixlen;
978 if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6)
979 {
980 len = hostcpy_icmp(addr + 1, host, type);
981 }
982 else
983 {
984 len = hostcpy(addr + 1, host, include_port);
985 }
986 addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len);
987 PFKEY_EXT_ADD(msg, addr);
988 }
989
990 /**
991 * adds an empty address extension to the given sadb_msg
992 */
993 static void add_anyaddr_ext(struct sadb_msg *msg, int family, u_int8_t type)
994 {
995 socklen_t len = (family == AF_INET) ? sizeof(struct sockaddr_in) :
996 sizeof(struct sockaddr_in6);
997 struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg);
998 addr->sadb_address_exttype = type;
999 sockaddr_t *saddr = (sockaddr_t*)(addr + 1);
1000 saddr->sa_family = family;
1001 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1002 saddr->sa_len = len;
1003 #endif
1004 addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len);
1005 PFKEY_EXT_ADD(msg, addr);
1006 }
1007
1008 #ifdef HAVE_NATT
1009 /**
1010 * add udp encap extensions to a sadb_msg
1011 */
1012 static void add_encap_ext(struct sadb_msg *msg, host_t *src, host_t *dst)
1013 {
1014 struct sadb_x_nat_t_type* nat_type;
1015 struct sadb_x_nat_t_port* nat_port;
1016
1017 nat_type = (struct sadb_x_nat_t_type*)PFKEY_EXT_ADD_NEXT(msg);
1018 nat_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1019 nat_type->sadb_x_nat_t_type_len = PFKEY_LEN(sizeof(*nat_type));
1020 nat_type->sadb_x_nat_t_type_type = UDP_ENCAP_ESPINUDP;
1021 PFKEY_EXT_ADD(msg, nat_type);
1022
1023 nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
1024 nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1025 nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port));
1026 nat_port->sadb_x_nat_t_port_port = htons(src->get_port(src));
1027 PFKEY_EXT_ADD(msg, nat_port);
1028
1029 nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
1030 nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1031 nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port));
1032 nat_port->sadb_x_nat_t_port_port = htons(dst->get_port(dst));
1033 PFKEY_EXT_ADD(msg, nat_port);
1034 }
1035 #endif /*HAVE_NATT*/
1036
1037 /**
1038 * Convert a sadb_address to a traffic_selector
1039 */
1040 static traffic_selector_t* sadb_address2ts(struct sadb_address *address)
1041 {
1042 traffic_selector_t *ts;
1043 host_t *host;
1044 u_int8_t proto;
1045
1046 proto = address->sadb_address_proto;
1047 proto = proto == IPSEC_PROTO_ANY ? 0 : proto;
1048
1049 /* The Linux 2.6 kernel does not set the protocol and port information
1050 * in the src and dst sadb_address extensions of the SADB_ACQUIRE message.
1051 */
1052 host = host_create_from_sockaddr((sockaddr_t*)&address[1]);
1053 ts = traffic_selector_create_from_subnet(host,
1054 address->sadb_address_prefixlen,
1055 proto, host->get_port(host),
1056 host->get_port(host) ?: 65535);
1057 return ts;
1058 }
1059
1060 /**
1061 * Parses a pfkey message received from the kernel
1062 */
1063 static status_t parse_pfkey_message(struct sadb_msg *msg, pfkey_msg_t *out)
1064 {
1065 struct sadb_ext* ext;
1066 size_t len;
1067
1068 memset(out, 0, sizeof(pfkey_msg_t));
1069 out->msg = msg;
1070
1071 len = msg->sadb_msg_len;
1072 len -= PFKEY_LEN(sizeof(struct sadb_msg));
1073
1074 ext = (struct sadb_ext*)(((char*)msg) + sizeof(struct sadb_msg));
1075
1076 while (len >= PFKEY_LEN(sizeof(struct sadb_ext)))
1077 {
1078 DBG3(DBG_KNL, " %N", sadb_ext_type_names, ext->sadb_ext_type);
1079 if (ext->sadb_ext_len < PFKEY_LEN(sizeof(struct sadb_ext)) ||
1080 ext->sadb_ext_len > len)
1081 {
1082 DBG1(DBG_KNL, "length of %N extension is invalid",
1083 sadb_ext_type_names, ext->sadb_ext_type);
1084 break;
1085 }
1086
1087 if ((ext->sadb_ext_type > SADB_EXT_MAX) || (!ext->sadb_ext_type))
1088 {
1089 DBG1(DBG_KNL, "type of PF_KEY extension (%d) is invalid",
1090 ext->sadb_ext_type);
1091 break;
1092 }
1093
1094 if (out->ext[ext->sadb_ext_type])
1095 {
1096 DBG1(DBG_KNL, "duplicate %N extension",
1097 sadb_ext_type_names, ext->sadb_ext_type);
1098 break;
1099 }
1100
1101 out->ext[ext->sadb_ext_type] = ext;
1102 ext = PFKEY_EXT_NEXT_LEN(ext, len);
1103 }
1104
1105 if (len)
1106 {
1107 DBG1(DBG_KNL, "PF_KEY message length is invalid");
1108 return FAILED;
1109 }
1110
1111 return SUCCESS;
1112 }
1113
1114 /**
1115 * Send a message to a specific PF_KEY socket and handle the response.
1116 */
1117 static status_t pfkey_send_socket(private_kernel_pfkey_ipsec_t *this, int socket,
1118 struct sadb_msg *in, struct sadb_msg **out, size_t *out_len)
1119 {
1120 unsigned char buf[PFKEY_BUFFER_SIZE];
1121 struct sadb_msg *msg;
1122 int in_len, len;
1123
1124 this->mutex_pfkey->lock(this->mutex_pfkey);
1125
1126 /* FIXME: our usage of sequence numbers is probably wrong. check RFC 2367,
1127 * in particular the behavior in response to an SADB_ACQUIRE. */
1128 in->sadb_msg_seq = ++this->seq;
1129 in->sadb_msg_pid = getpid();
1130
1131 in_len = PFKEY_USER_LEN(in->sadb_msg_len);
1132
1133 while (TRUE)
1134 {
1135 len = send(socket, in, in_len, 0);
1136
1137 if (len != in_len)
1138 {
1139 if (errno == EINTR)
1140 {
1141 /* interrupted, try again */
1142 continue;
1143 }
1144 this->mutex_pfkey->unlock(this->mutex_pfkey);
1145 DBG1(DBG_KNL, "error sending to PF_KEY socket: %s",
1146 strerror(errno));
1147 return FAILED;
1148 }
1149 break;
1150 }
1151
1152 while (TRUE)
1153 {
1154 msg = (struct sadb_msg*)buf;
1155
1156 len = recv(socket, buf, sizeof(buf), 0);
1157
1158 if (len < 0)
1159 {
1160 if (errno == EINTR)
1161 {
1162 DBG1(DBG_KNL, "got interrupted");
1163 /* interrupted, try again */
1164 continue;
1165 }
1166 DBG1(DBG_KNL, "error reading from PF_KEY socket: %s",
1167 strerror(errno));
1168 this->mutex_pfkey->unlock(this->mutex_pfkey);
1169 return FAILED;
1170 }
1171 if (len < sizeof(struct sadb_msg) ||
1172 msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
1173 {
1174 DBG1(DBG_KNL, "received corrupted PF_KEY message");
1175 this->mutex_pfkey->unlock(this->mutex_pfkey);
1176 return FAILED;
1177 }
1178 if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
1179 {
1180 DBG1(DBG_KNL, "buffer was too small to receive the complete PF_KEY "
1181 "message");
1182 this->mutex_pfkey->unlock(this->mutex_pfkey);
1183 return FAILED;
1184 }
1185 if (msg->sadb_msg_pid != in->sadb_msg_pid)
1186 {
1187 DBG2(DBG_KNL, "received PF_KEY message is not intended for us");
1188 continue;
1189 }
1190 if (msg->sadb_msg_seq != this->seq)
1191 {
1192 DBG2(DBG_KNL, "received PF_KEY message with unexpected sequence "
1193 "number, was %d expected %d", msg->sadb_msg_seq,
1194 this->seq);
1195 if (msg->sadb_msg_seq == 0)
1196 {
1197 /* FreeBSD and Mac OS X do this for the response to
1198 * SADB_X_SPDGET (but not for the response to SADB_GET).
1199 * FreeBSD: 'key_spdget' in /usr/src/sys/netipsec/key.c. */
1200 }
1201 else if (msg->sadb_msg_seq < this->seq)
1202 {
1203 continue;
1204 }
1205 else
1206 {
1207 this->mutex_pfkey->unlock(this->mutex_pfkey);
1208 return FAILED;
1209 }
1210 }
1211 if (msg->sadb_msg_type != in->sadb_msg_type)
1212 {
1213 DBG2(DBG_KNL, "received PF_KEY message of wrong type, "
1214 "was %d expected %d, ignoring", msg->sadb_msg_type,
1215 in->sadb_msg_type);
1216 }
1217 break;
1218 }
1219
1220 *out_len = len;
1221 *out = (struct sadb_msg*)malloc(len);
1222 memcpy(*out, buf, len);
1223
1224 this->mutex_pfkey->unlock(this->mutex_pfkey);
1225 return SUCCESS;
1226 }
1227
1228 /**
1229 * Send a message to the default PF_KEY socket and handle the response.
1230 */
1231 static status_t pfkey_send(private_kernel_pfkey_ipsec_t *this,
1232 struct sadb_msg *in, struct sadb_msg **out,
1233 size_t *out_len)
1234 {
1235 return pfkey_send_socket(this, this->socket, in, out, out_len);
1236 }
1237
1238 /**
1239 * Process a SADB_ACQUIRE message from the kernel
1240 */
1241 static void process_acquire(private_kernel_pfkey_ipsec_t *this,
1242 struct sadb_msg* msg)
1243 {
1244 pfkey_msg_t response;
1245 u_int32_t index, reqid = 0;
1246 traffic_selector_t *src_ts, *dst_ts;
1247 policy_entry_t *policy;
1248 policy_sa_t *sa;
1249
1250 switch (msg->sadb_msg_satype)
1251 {
1252 case SADB_SATYPE_UNSPEC:
1253 case SADB_SATYPE_ESP:
1254 case SADB_SATYPE_AH:
1255 break;
1256 default:
1257 /* acquire for AH/ESP only */
1258 return;
1259 }
1260 DBG2(DBG_KNL, "received an SADB_ACQUIRE");
1261
1262 if (parse_pfkey_message(msg, &response) != SUCCESS)
1263 {
1264 DBG1(DBG_KNL, "parsing SADB_ACQUIRE from kernel failed");
1265 return;
1266 }
1267
1268 index = response.x_policy->sadb_x_policy_id;
1269 this->mutex->lock(this->mutex);
1270 if (this->policies->find_first(this->policies,
1271 (linked_list_match_t)policy_entry_match_byindex,
1272 (void**)&policy, &index) == SUCCESS &&
1273 policy->used_by->get_first(policy->used_by, (void**)&sa) == SUCCESS)
1274 {
1275 reqid = sa->sa->cfg.reqid;
1276 }
1277 else
1278 {
1279 DBG1(DBG_KNL, "received an SADB_ACQUIRE with policy id %d but no "
1280 "matching policy found", index);
1281 }
1282 this->mutex->unlock(this->mutex);
1283
1284 src_ts = sadb_address2ts(response.src);
1285 dst_ts = sadb_address2ts(response.dst);
1286
1287 hydra->kernel_interface->acquire(hydra->kernel_interface, reqid, src_ts,
1288 dst_ts);
1289 }
1290
1291 /**
1292 * Process a SADB_EXPIRE message from the kernel
1293 */
1294 static void process_expire(private_kernel_pfkey_ipsec_t *this,
1295 struct sadb_msg* msg)
1296 {
1297 pfkey_msg_t response;
1298 u_int8_t protocol;
1299 u_int32_t spi, reqid;
1300 bool hard;
1301
1302 DBG2(DBG_KNL, "received an SADB_EXPIRE");
1303
1304 if (parse_pfkey_message(msg, &response) != SUCCESS)
1305 {
1306 DBG1(DBG_KNL, "parsing SADB_EXPIRE from kernel failed");
1307 return;
1308 }
1309
1310 protocol = satype2proto(msg->sadb_msg_satype);
1311 spi = response.sa->sadb_sa_spi;
1312 reqid = response.x_sa2->sadb_x_sa2_reqid;
1313 hard = response.lft_hard != NULL;
1314
1315 if (protocol != IPPROTO_ESP && protocol != IPPROTO_AH)
1316 {
1317 DBG2(DBG_KNL, "ignoring SADB_EXPIRE for SA with SPI %.8x and "
1318 "reqid {%u} which is not a CHILD_SA", ntohl(spi), reqid);
1319 return;
1320 }
1321
1322 hydra->kernel_interface->expire(hydra->kernel_interface, reqid, protocol,
1323 spi, hard);
1324 }
1325
1326 #ifdef SADB_X_MIGRATE
1327 /**
1328 * Process a SADB_X_MIGRATE message from the kernel
1329 */
1330 static void process_migrate(private_kernel_pfkey_ipsec_t *this,
1331 struct sadb_msg* msg)
1332 {
1333 pfkey_msg_t response;
1334 traffic_selector_t *src_ts, *dst_ts;
1335 policy_dir_t dir;
1336 u_int32_t reqid = 0;
1337 host_t *local = NULL, *remote = NULL;
1338
1339 DBG2(DBG_KNL, "received an SADB_X_MIGRATE");
1340
1341 if (parse_pfkey_message(msg, &response) != SUCCESS)
1342 {
1343 DBG1(DBG_KNL, "parsing SADB_X_MIGRATE from kernel failed");
1344 return;
1345 }
1346 src_ts = sadb_address2ts(response.src);
1347 dst_ts = sadb_address2ts(response.dst);
1348 dir = kernel2dir(response.x_policy->sadb_x_policy_dir);
1349 DBG2(DBG_KNL, " policy %R === %R %N, id %u", src_ts, dst_ts,
1350 policy_dir_names, dir);
1351
1352 /* SADB_X_EXT_KMADDRESS is not present in unpatched kernels < 2.6.28 */
1353 if (response.x_kmaddress)
1354 {
1355 sockaddr_t *local_addr, *remote_addr;
1356 u_int32_t local_len;
1357
1358 local_addr = (sockaddr_t*)&response.x_kmaddress[1];
1359 local = host_create_from_sockaddr(local_addr);
1360 local_len = (local_addr->sa_family == AF_INET6)?
1361 sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
1362 remote_addr = (sockaddr_t*)((u_int8_t*)local_addr + local_len);
1363 remote = host_create_from_sockaddr(remote_addr);
1364 DBG2(DBG_KNL, " kmaddress: %H...%H", local, remote);
1365 }
1366
1367 if (src_ts && dst_ts && local && remote)
1368 {
1369 hydra->kernel_interface->migrate(hydra->kernel_interface, reqid,
1370 src_ts, dst_ts, dir, local, remote);
1371 }
1372 else
1373 {
1374 DESTROY_IF(src_ts);
1375 DESTROY_IF(dst_ts);
1376 DESTROY_IF(local);
1377 DESTROY_IF(remote);
1378 }
1379 }
1380 #endif /*SADB_X_MIGRATE*/
1381
1382 #ifdef SADB_X_NAT_T_NEW_MAPPING
1383 /**
1384 * Process a SADB_X_NAT_T_NEW_MAPPING message from the kernel
1385 */
1386 static void process_mapping(private_kernel_pfkey_ipsec_t *this,
1387 struct sadb_msg* msg)
1388 {
1389 pfkey_msg_t response;
1390 u_int32_t spi, reqid;
1391 sockaddr_t *sa;
1392 host_t *host;
1393
1394 DBG2(DBG_KNL, "received an SADB_X_NAT_T_NEW_MAPPING");
1395
1396 if (parse_pfkey_message(msg, &response) != SUCCESS)
1397 {
1398 DBG1(DBG_KNL, "parsing SADB_X_NAT_T_NEW_MAPPING from kernel failed");
1399 return;
1400 }
1401
1402 if (!response.x_sa2)
1403 {
1404 DBG1(DBG_KNL, "received SADB_X_NAT_T_NEW_MAPPING is missing required "
1405 "information");
1406 return;
1407 }
1408
1409 spi = response.sa->sadb_sa_spi;
1410 reqid = response.x_sa2->sadb_x_sa2_reqid;
1411
1412 if (satype2proto(msg->sadb_msg_satype) != IPPROTO_ESP)
1413 {
1414 return;
1415 }
1416
1417 sa = (sockaddr_t*)(response.dst + 1);
1418 switch (sa->sa_family)
1419 {
1420 case AF_INET:
1421 {
1422 struct sockaddr_in *sin = (struct sockaddr_in*)sa;
1423 sin->sin_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1424 break;
1425 }
1426 case AF_INET6:
1427 {
1428 struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa;
1429 sin6->sin6_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1430 break;
1431 }
1432 default:
1433 break;
1434 }
1435
1436 host = host_create_from_sockaddr(sa);
1437 if (host)
1438 {
1439 hydra->kernel_interface->mapping(hydra->kernel_interface, reqid,
1440 spi, host);
1441 }
1442 }
1443 #endif /*SADB_X_NAT_T_NEW_MAPPING*/
1444
1445 /**
1446 * Receives events from kernel
1447 */
1448 static bool receive_events(private_kernel_pfkey_ipsec_t *this, int fd,
1449 watcher_event_t event)
1450 {
1451 unsigned char buf[PFKEY_BUFFER_SIZE];
1452 struct sadb_msg *msg = (struct sadb_msg*)buf;
1453 int len;
1454
1455 len = recvfrom(this->socket_events, buf, sizeof(buf), MSG_DONTWAIT, NULL, 0);
1456 if (len < 0)
1457 {
1458 switch (errno)
1459 {
1460 case EINTR:
1461 /* interrupted, try again */
1462 return TRUE;
1463 case EAGAIN:
1464 /* no data ready, select again */
1465 return TRUE;
1466 default:
1467 DBG1(DBG_KNL, "unable to receive from PF_KEY event socket");
1468 sleep(1);
1469 return TRUE;
1470 }
1471 }
1472
1473 if (len < sizeof(struct sadb_msg) ||
1474 msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
1475 {
1476 DBG2(DBG_KNL, "received corrupted PF_KEY message");
1477 return TRUE;
1478 }
1479 if (msg->sadb_msg_pid != 0)
1480 { /* not from kernel. not interested, try another one */
1481 return TRUE;
1482 }
1483 if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
1484 {
1485 DBG1(DBG_KNL, "buffer was too small to receive the complete "
1486 "PF_KEY message");
1487 return TRUE;
1488 }
1489
1490 switch (msg->sadb_msg_type)
1491 {
1492 case SADB_ACQUIRE:
1493 process_acquire(this, msg);
1494 break;
1495 case SADB_EXPIRE:
1496 process_expire(this, msg);
1497 break;
1498 #ifdef SADB_X_MIGRATE
1499 case SADB_X_MIGRATE:
1500 process_migrate(this, msg);
1501 break;
1502 #endif /*SADB_X_MIGRATE*/
1503 #ifdef SADB_X_NAT_T_NEW_MAPPING
1504 case SADB_X_NAT_T_NEW_MAPPING:
1505 process_mapping(this, msg);
1506 break;
1507 #endif /*SADB_X_NAT_T_NEW_MAPPING*/
1508 default:
1509 break;
1510 }
1511
1512 return TRUE;
1513 }
1514
1515 /**
1516 * Get an SPI for a specific protocol from the kernel.
1517 */
1518
1519 static status_t get_spi_internal(private_kernel_pfkey_ipsec_t *this,
1520 host_t *src, host_t *dst, u_int8_t proto, u_int32_t min, u_int32_t max,
1521 u_int32_t *spi)
1522 {
1523 unsigned char request[PFKEY_BUFFER_SIZE];
1524 struct sadb_msg *msg, *out;
1525 struct sadb_spirange *range;
1526 pfkey_msg_t response;
1527 u_int32_t received_spi = 0;
1528 size_t len;
1529
1530 memset(&request, 0, sizeof(request));
1531
1532 msg = (struct sadb_msg*)request;
1533 msg->sadb_msg_version = PF_KEY_V2;
1534 msg->sadb_msg_type = SADB_GETSPI;
1535 msg->sadb_msg_satype = proto2satype(proto);
1536 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1537
1538 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1539 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1540
1541 range = (struct sadb_spirange*)PFKEY_EXT_ADD_NEXT(msg);
1542 range->sadb_spirange_exttype = SADB_EXT_SPIRANGE;
1543 range->sadb_spirange_len = PFKEY_LEN(sizeof(struct sadb_spirange));
1544 range->sadb_spirange_min = min;
1545 range->sadb_spirange_max = max;
1546 PFKEY_EXT_ADD(msg, range);
1547
1548 if (pfkey_send(this, msg, &out, &len) == SUCCESS)
1549 {
1550 if (out->sadb_msg_errno)
1551 {
1552 DBG1(DBG_KNL, "allocating SPI failed: %s (%d)",
1553 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
1554 }
1555 else if (parse_pfkey_message(out, &response) == SUCCESS)
1556 {
1557 received_spi = response.sa->sadb_sa_spi;
1558 }
1559 free(out);
1560 }
1561
1562 if (received_spi == 0)
1563 {
1564 return FAILED;
1565 }
1566
1567 *spi = received_spi;
1568 return SUCCESS;
1569 }
1570
1571 METHOD(kernel_ipsec_t, get_spi, status_t,
1572 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1573 u_int8_t protocol, u_int32_t *spi)
1574 {
1575 if (get_spi_internal(this, src, dst, protocol,
1576 0xc0000000, 0xcFFFFFFF, spi) != SUCCESS)
1577 {
1578 DBG1(DBG_KNL, "unable to get SPI");
1579 return FAILED;
1580 }
1581
1582 DBG2(DBG_KNL, "got SPI %.8x", ntohl(*spi));
1583 return SUCCESS;
1584 }
1585
1586 METHOD(kernel_ipsec_t, get_cpi, status_t,
1587 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1588 u_int16_t *cpi)
1589 {
1590 u_int32_t received_spi = 0;
1591
1592 DBG2(DBG_KNL, "getting CPI");
1593
1594 if (get_spi_internal(this, src, dst, IPPROTO_COMP,
1595 0x100, 0xEFFF, &received_spi) != SUCCESS)
1596 {
1597 DBG1(DBG_KNL, "unable to get CPI");
1598 return FAILED;
1599 }
1600
1601 *cpi = htons((u_int16_t)ntohl(received_spi));
1602
1603 DBG2(DBG_KNL, "got CPI %.4x", ntohs(*cpi));
1604 return SUCCESS;
1605 }
1606
1607 METHOD(kernel_ipsec_t, add_sa, status_t,
1608 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, u_int32_t spi,
1609 u_int8_t protocol, u_int32_t reqid, mark_t mark, u_int32_t tfc,
1610 lifetime_cfg_t *lifetime, u_int16_t enc_alg, chunk_t enc_key,
1611 u_int16_t int_alg, chunk_t int_key, ipsec_mode_t mode,
1612 u_int16_t ipcomp, u_int16_t cpi, u_int32_t replay_window,
1613 bool initiator, bool encap, bool esn, bool inbound,
1614 traffic_selector_t *src_ts, traffic_selector_t *dst_ts)
1615 {
1616 unsigned char request[PFKEY_BUFFER_SIZE];
1617 struct sadb_msg *msg, *out;
1618 struct sadb_sa *sa;
1619 struct sadb_x_sa2 *sa2;
1620 struct sadb_lifetime *lft;
1621 struct sadb_key *key;
1622 size_t len;
1623
1624 /* if IPComp is used, we install an additional IPComp SA. if the cpi is 0
1625 * we are in the recursive call below */
1626 if (ipcomp != IPCOMP_NONE && cpi != 0)
1627 {
1628 lifetime_cfg_t lft = {{0,0,0},{0,0,0},{0,0,0}};
1629 add_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, reqid, mark,
1630 tfc, &lft, ENCR_UNDEFINED, chunk_empty, AUTH_UNDEFINED,
1631 chunk_empty, mode, ipcomp, 0, 0, FALSE, FALSE, FALSE, inbound,
1632 NULL, NULL);
1633 ipcomp = IPCOMP_NONE;
1634 /* use transport mode ESP SA, IPComp uses tunnel mode */
1635 mode = MODE_TRANSPORT;
1636 }
1637
1638 if (inbound)
1639 {
1640 /* As we didn't know the reqid during SPI allocation, we used reqid
1641 * zero. Unfortunately we can't SADB_UPDATE to the new reqid, hence we
1642 * have to delete the SPI allocation state manually. The reqid
1643 * selector does not count for that, therefore we have to delete
1644 * that state before installing the new SA to avoid deleting the
1645 * the new state after installing it. */
1646 mark_t zeromark = {0, 0};
1647
1648 if (this->public.interface.del_sa(&this->public.interface,
1649 src, dst, spi, protocol, 0, zeromark) != SUCCESS)
1650 {
1651 DBG1(DBG_KNL, "deleting SPI allocation SA failed");
1652 }
1653 }
1654
1655 memset(&request, 0, sizeof(request));
1656
1657 DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u}",
1658 ntohl(spi), reqid);
1659
1660 msg = (struct sadb_msg*)request;
1661 msg->sadb_msg_version = PF_KEY_V2;
1662 msg->sadb_msg_type = SADB_ADD;
1663 msg->sadb_msg_satype = proto2satype(protocol);
1664 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1665
1666 #ifdef __APPLE__
1667 if (encap)
1668 {
1669 struct sadb_sa_2 *sa_2;
1670 sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
1671 sa_2->sadb_sa_natt_port = dst->get_port(dst);
1672 sa = &sa_2->sa;
1673 sa->sadb_sa_flags |= SADB_X_EXT_NATT;
1674 len = sizeof(struct sadb_sa_2);
1675 }
1676 else
1677 #endif
1678 {
1679 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1680 len = sizeof(struct sadb_sa);
1681 }
1682 sa->sadb_sa_exttype = SADB_EXT_SA;
1683 sa->sadb_sa_len = PFKEY_LEN(len);
1684 sa->sadb_sa_spi = spi;
1685 if (protocol == IPPROTO_COMP)
1686 {
1687 sa->sadb_sa_encrypt = lookup_algorithm(COMPRESSION_ALGORITHM, ipcomp);
1688 }
1689 else
1690 {
1691 /* Linux interprets sadb_sa_replay as number of packets/bits in the
1692 * replay window, whereas on BSD it's the size of the window in bytes */
1693 #ifdef __linux__
1694 sa->sadb_sa_replay = min(replay_window, 32);
1695 #else
1696 sa->sadb_sa_replay = (replay_window + 7) / 8;
1697 #endif
1698 sa->sadb_sa_auth = lookup_algorithm(INTEGRITY_ALGORITHM, int_alg);
1699 sa->sadb_sa_encrypt = lookup_algorithm(ENCRYPTION_ALGORITHM, enc_alg);
1700 }
1701 PFKEY_EXT_ADD(msg, sa);
1702
1703 sa2 = (struct sadb_x_sa2*)PFKEY_EXT_ADD_NEXT(msg);
1704 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1705 sa2->sadb_x_sa2_len = PFKEY_LEN(sizeof(struct sadb_spirange));
1706 sa2->sadb_x_sa2_mode = mode2kernel(mode);
1707 sa2->sadb_x_sa2_reqid = reqid;
1708 PFKEY_EXT_ADD(msg, sa2);
1709
1710 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1711 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1712
1713 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
1714 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1715 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
1716 lft->sadb_lifetime_allocations = lifetime->packets.rekey;
1717 lft->sadb_lifetime_bytes = lifetime->bytes.rekey;
1718 lft->sadb_lifetime_addtime = lifetime->time.rekey;
1719 lft->sadb_lifetime_usetime = 0; /* we only use addtime */
1720 PFKEY_EXT_ADD(msg, lft);
1721
1722 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
1723 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1724 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
1725 lft->sadb_lifetime_allocations = lifetime->packets.life;
1726 lft->sadb_lifetime_bytes = lifetime->bytes.life;
1727 lft->sadb_lifetime_addtime = lifetime->time.life;
1728 lft->sadb_lifetime_usetime = 0; /* we only use addtime */
1729 PFKEY_EXT_ADD(msg, lft);
1730
1731 if (enc_alg != ENCR_UNDEFINED)
1732 {
1733 if (!sa->sadb_sa_encrypt)
1734 {
1735 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1736 encryption_algorithm_names, enc_alg);
1737 return FAILED;
1738 }
1739 DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
1740 encryption_algorithm_names, enc_alg, enc_key.len * 8);
1741
1742 key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
1743 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
1744 key->sadb_key_bits = enc_key.len * 8;
1745 key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + enc_key.len);
1746 memcpy(key + 1, enc_key.ptr, enc_key.len);
1747
1748 PFKEY_EXT_ADD(msg, key);
1749 }
1750
1751 if (int_alg != AUTH_UNDEFINED)
1752 {
1753 if (!sa->sadb_sa_auth)
1754 {
1755 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1756 integrity_algorithm_names, int_alg);
1757 return FAILED;
1758 }
1759 DBG2(DBG_KNL, " using integrity algorithm %N with key size %d",
1760 integrity_algorithm_names, int_alg, int_key.len * 8);
1761
1762 key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
1763 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
1764 key->sadb_key_bits = int_key.len * 8;
1765 key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + int_key.len);
1766 memcpy(key + 1, int_key.ptr, int_key.len);
1767
1768 PFKEY_EXT_ADD(msg, key);
1769 }
1770
1771 #ifdef HAVE_NATT
1772 if (encap)
1773 {
1774 add_encap_ext(msg, src, dst);
1775 }
1776 #endif /*HAVE_NATT*/
1777
1778 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1779 {
1780 DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi));
1781 return FAILED;
1782 }
1783 else if (out->sadb_msg_errno)
1784 {
1785 DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x: %s (%d)",
1786 ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno);
1787 free(out);
1788 return FAILED;
1789 }
1790
1791 free(out);
1792 return SUCCESS;
1793 }
1794
1795 METHOD(kernel_ipsec_t, update_sa, status_t,
1796 private_kernel_pfkey_ipsec_t *this, u_int32_t spi, u_int8_t protocol,
1797 u_int16_t cpi, host_t *src, host_t *dst, host_t *new_src, host_t *new_dst,
1798 bool encap, bool new_encap, mark_t mark)
1799 {
1800 unsigned char request[PFKEY_BUFFER_SIZE];
1801 struct sadb_msg *msg, *out;
1802 struct sadb_sa *sa;
1803 pfkey_msg_t response;
1804 size_t len;
1805
1806 /* we can't update the SA if any of the ip addresses have changed.
1807 * that's because we can't use SADB_UPDATE and by deleting and readding the
1808 * SA the sequence numbers would get lost */
1809 if (!src->ip_equals(src, new_src) ||
1810 !dst->ip_equals(dst, new_dst))
1811 {
1812 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: address "
1813 "changes are not supported", ntohl(spi));
1814 return NOT_SUPPORTED;
1815 }
1816
1817 /* if IPComp is used, we first update the IPComp SA */
1818 if (cpi)
1819 {
1820 update_sa(this, htonl(ntohs(cpi)), IPPROTO_COMP, 0,
1821 src, dst, new_src, new_dst, FALSE, FALSE, mark);
1822 }
1823
1824 memset(&request, 0, sizeof(request));
1825
1826 DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
1827
1828 msg = (struct sadb_msg*)request;
1829 msg->sadb_msg_version = PF_KEY_V2;
1830 msg->sadb_msg_type = SADB_GET;
1831 msg->sadb_msg_satype = proto2satype(protocol);
1832 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1833
1834 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1835 sa->sadb_sa_exttype = SADB_EXT_SA;
1836 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
1837 sa->sadb_sa_spi = spi;
1838 PFKEY_EXT_ADD(msg, sa);
1839
1840 /* the kernel wants a SADB_EXT_ADDRESS_SRC to be present even though
1841 * it is not used for anything. */
1842 add_anyaddr_ext(msg, dst->get_family(dst), SADB_EXT_ADDRESS_SRC);
1843 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1844
1845 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1846 {
1847 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1848 return FAILED;
1849 }
1850 else if (out->sadb_msg_errno)
1851 {
1852 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
1853 ntohl(spi), strerror(out->sadb_msg_errno),
1854 out->sadb_msg_errno);
1855 free(out);
1856 return FAILED;
1857 }
1858 else if (parse_pfkey_message(out, &response) != SUCCESS)
1859 {
1860 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: parsing "
1861 "response from kernel failed", ntohl(spi));
1862 free(out);
1863 return FAILED;
1864 }
1865
1866 DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H",
1867 ntohl(spi), src, dst, new_src, new_dst);
1868
1869 memset(&request, 0, sizeof(request));
1870
1871 msg = (struct sadb_msg*)request;
1872 msg->sadb_msg_version = PF_KEY_V2;
1873 msg->sadb_msg_type = SADB_UPDATE;
1874 msg->sadb_msg_satype = proto2satype(protocol);
1875 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1876
1877 #ifdef __APPLE__
1878 {
1879 struct sadb_sa_2 *sa_2;
1880 sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
1881 sa_2->sa.sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa_2));
1882 memcpy(&sa_2->sa, response.sa, sizeof(struct sadb_sa));
1883 if (encap)
1884 {
1885 sa_2->sadb_sa_natt_port = new_dst->get_port(new_dst);
1886 sa_2->sa.sadb_sa_flags |= SADB_X_EXT_NATT;
1887 }
1888 }
1889 #else
1890 PFKEY_EXT_COPY(msg, response.sa);
1891 #endif
1892 PFKEY_EXT_COPY(msg, response.x_sa2);
1893
1894 PFKEY_EXT_COPY(msg, response.src);
1895 PFKEY_EXT_COPY(msg, response.dst);
1896
1897 PFKEY_EXT_COPY(msg, response.lft_soft);
1898 PFKEY_EXT_COPY(msg, response.lft_hard);
1899
1900 if (response.key_encr)
1901 {
1902 PFKEY_EXT_COPY(msg, response.key_encr);
1903 }
1904
1905 if (response.key_auth)
1906 {
1907 PFKEY_EXT_COPY(msg, response.key_auth);
1908 }
1909
1910 #ifdef HAVE_NATT
1911 if (new_encap)
1912 {
1913 add_encap_ext(msg, new_src, new_dst);
1914 }
1915 #endif /*HAVE_NATT*/
1916
1917 free(out);
1918
1919 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1920 {
1921 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
1922 return FAILED;
1923 }
1924 else if (out->sadb_msg_errno)
1925 {
1926 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: %s (%d)",
1927 ntohl(spi), strerror(out->sadb_msg_errno),
1928 out->sadb_msg_errno);
1929 free(out);
1930 return FAILED;
1931 }
1932 free(out);
1933
1934 return SUCCESS;
1935 }
1936
1937 METHOD(kernel_ipsec_t, query_sa, status_t,
1938 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1939 u_int32_t spi, u_int8_t protocol, mark_t mark,
1940 u_int64_t *bytes, u_int64_t *packets, time_t *time)
1941 {
1942 unsigned char request[PFKEY_BUFFER_SIZE];
1943 struct sadb_msg *msg, *out;
1944 struct sadb_sa *sa;
1945 pfkey_msg_t response;
1946 size_t len;
1947
1948 memset(&request, 0, sizeof(request));
1949
1950 DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
1951
1952 msg = (struct sadb_msg*)request;
1953 msg->sadb_msg_version = PF_KEY_V2;
1954 msg->sadb_msg_type = SADB_GET;
1955 msg->sadb_msg_satype = proto2satype(protocol);
1956 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1957
1958 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1959 sa->sadb_sa_exttype = SADB_EXT_SA;
1960 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
1961 sa->sadb_sa_spi = spi;
1962 PFKEY_EXT_ADD(msg, sa);
1963
1964 /* the Linux Kernel doesn't care for the src address, but other systems do
1965 * (e.g. FreeBSD)
1966 */
1967 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1968 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1969
1970 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1971 {
1972 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1973 return FAILED;
1974 }
1975 else if (out->sadb_msg_errno)
1976 {
1977 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
1978 ntohl(spi), strerror(out->sadb_msg_errno),
1979 out->sadb_msg_errno);
1980 free(out);
1981 return FAILED;
1982 }
1983 else if (parse_pfkey_message(out, &response) != SUCCESS)
1984 {
1985 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1986 free(out);
1987 return FAILED;
1988 }
1989 if (bytes)
1990 {
1991 *bytes = response.lft_current->sadb_lifetime_bytes;
1992 }
1993 if (packets)
1994 {
1995 /* at least on Linux and FreeBSD this contains the number of packets */
1996 *packets = response.lft_current->sadb_lifetime_allocations;
1997 }
1998 if (time)
1999 {
2000 #ifdef __APPLE__
2001 /* OS X uses the "last" time of use in usetime */
2002 *time = response.lft_current->sadb_lifetime_usetime;
2003 #else /* !__APPLE__ */
2004 /* on Linux, sadb_lifetime_usetime is set to the "first" time of use,
2005 * which is actually correct according to PF_KEY. We have to query
2006 * policies for the last usetime. */
2007 *time = 0;
2008 #endif /* !__APPLE__ */
2009 }
2010
2011 free(out);
2012 return SUCCESS;
2013 }
2014
2015 METHOD(kernel_ipsec_t, del_sa, status_t,
2016 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
2017 u_int32_t spi, u_int8_t protocol, u_int16_t cpi, mark_t mark)
2018 {
2019 unsigned char request[PFKEY_BUFFER_SIZE];
2020 struct sadb_msg *msg, *out;
2021 struct sadb_sa *sa;
2022 size_t len;
2023
2024 /* if IPComp was used, we first delete the additional IPComp SA */
2025 if (cpi)
2026 {
2027 del_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, 0, mark);
2028 }
2029
2030 memset(&request, 0, sizeof(request));
2031
2032 DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(spi));
2033
2034 msg = (struct sadb_msg*)request;
2035 msg->sadb_msg_version = PF_KEY_V2;
2036 msg->sadb_msg_type = SADB_DELETE;
2037 msg->sadb_msg_satype = proto2satype(protocol);
2038 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2039
2040 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
2041 sa->sadb_sa_exttype = SADB_EXT_SA;
2042 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
2043 sa->sadb_sa_spi = spi;
2044 PFKEY_EXT_ADD(msg, sa);
2045
2046 /* the Linux Kernel doesn't care for the src address, but other systems do
2047 * (e.g. FreeBSD)
2048 */
2049 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
2050 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
2051
2052 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2053 {
2054 DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(spi));
2055 return FAILED;
2056 }
2057 else if (out->sadb_msg_errno)
2058 {
2059 DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x: %s (%d)",
2060 ntohl(spi), strerror(out->sadb_msg_errno),
2061 out->sadb_msg_errno);
2062 free(out);
2063 return FAILED;
2064 }
2065
2066 DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(spi));
2067 free(out);
2068 return SUCCESS;
2069 }
2070
2071 METHOD(kernel_ipsec_t, flush_sas, status_t,
2072 private_kernel_pfkey_ipsec_t *this)
2073 {
2074 unsigned char request[PFKEY_BUFFER_SIZE];
2075 struct sadb_msg *msg, *out;
2076 size_t len;
2077
2078 memset(&request, 0, sizeof(request));
2079
2080 DBG2(DBG_KNL, "flushing all SAD entries");
2081
2082 msg = (struct sadb_msg*)request;
2083 msg->sadb_msg_version = PF_KEY_V2;
2084 msg->sadb_msg_type = SADB_FLUSH;
2085 msg->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2086 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2087
2088 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2089 {
2090 DBG1(DBG_KNL, "unable to flush SAD entries");
2091 return FAILED;
2092 }
2093 else if (out->sadb_msg_errno)
2094 {
2095 DBG1(DBG_KNL, "unable to flush SAD entries: %s (%d)",
2096 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2097 free(out);
2098 return FAILED;
2099 }
2100 free(out);
2101 return SUCCESS;
2102 }
2103
2104 /**
2105 * Add an explicit exclude route to a routing entry
2106 */
2107 static void add_exclude_route(private_kernel_pfkey_ipsec_t *this,
2108 route_entry_t *route, host_t *src, host_t *dst)
2109 {
2110 enumerator_t *enumerator;
2111 exclude_route_t *exclude;
2112 host_t *gtw;
2113
2114 enumerator = this->excludes->create_enumerator(this->excludes);
2115 while (enumerator->enumerate(enumerator, &exclude))
2116 {
2117 if (dst->ip_equals(dst, exclude->dst))
2118 {
2119 route->exclude = exclude;
2120 exclude->refs++;
2121 }
2122 }
2123 enumerator->destroy(enumerator);
2124
2125 if (!route->exclude)
2126 {
2127 DBG2(DBG_KNL, "installing new exclude route for %H src %H", dst, src);
2128 gtw = hydra->kernel_interface->get_nexthop(hydra->kernel_interface,
2129 dst, -1, NULL);
2130 if (gtw)
2131 {
2132 char *if_name = NULL;
2133
2134 if (hydra->kernel_interface->get_interface(
2135 hydra->kernel_interface, src, &if_name) &&
2136 hydra->kernel_interface->add_route(hydra->kernel_interface,
2137 dst->get_address(dst),
2138 dst->get_family(dst) == AF_INET ? 32 : 128,
2139 gtw, src, if_name) == SUCCESS)
2140 {
2141 INIT(exclude,
2142 .dst = dst->clone(dst),
2143 .src = src->clone(src),
2144 .gtw = gtw->clone(gtw),
2145 .refs = 1,
2146 );
2147 route->exclude = exclude;
2148 this->excludes->insert_last(this->excludes, exclude);
2149 }
2150 else
2151 {
2152 DBG1(DBG_KNL, "installing exclude route for %H failed", dst);
2153 }
2154 gtw->destroy(gtw);
2155 free(if_name);
2156 }
2157 else
2158 {
2159 DBG1(DBG_KNL, "gateway lookup for for %H failed", dst);
2160 }
2161 }
2162 }
2163
2164 /**
2165 * Remove an exclude route attached to a routing entry
2166 */
2167 static void remove_exclude_route(private_kernel_pfkey_ipsec_t *this,
2168 route_entry_t *route)
2169 {
2170 if (route->exclude)
2171 {
2172 enumerator_t *enumerator;
2173 exclude_route_t *exclude;
2174 bool removed = FALSE;
2175 host_t *dst;
2176
2177 enumerator = this->excludes->create_enumerator(this->excludes);
2178 while (enumerator->enumerate(enumerator, &exclude))
2179 {
2180 if (route->exclude == exclude)
2181 {
2182 if (--exclude->refs == 0)
2183 {
2184 this->excludes->remove_at(this->excludes, enumerator);
2185 removed = TRUE;
2186 break;
2187 }
2188 }
2189 }
2190 enumerator->destroy(enumerator);
2191
2192 if (removed)
2193 {
2194 char *if_name = NULL;
2195
2196 dst = route->exclude->dst;
2197 DBG2(DBG_KNL, "uninstalling exclude route for %H src %H",
2198 dst, route->exclude->src);
2199 if (hydra->kernel_interface->get_interface(
2200 hydra->kernel_interface,
2201 route->exclude->src, &if_name) &&
2202 hydra->kernel_interface->del_route(hydra->kernel_interface,
2203 dst->get_address(dst),
2204 dst->get_family(dst) == AF_INET ? 32 : 128,
2205 route->exclude->gtw, route->exclude->src,
2206 if_name) != SUCCESS)
2207 {
2208 DBG1(DBG_KNL, "uninstalling exclude route for %H failed", dst);
2209 }
2210 exclude_route_destroy(route->exclude);
2211 free(if_name);
2212 }
2213 route->exclude = NULL;
2214 }
2215 }
2216
2217 /**
2218 * Try to install a route to the given inbound policy
2219 */
2220 static bool install_route(private_kernel_pfkey_ipsec_t *this,
2221 policy_entry_t *policy, policy_sa_in_t *in)
2222 {
2223 route_entry_t *route, *old;
2224 host_t *host, *src, *dst;
2225 bool is_virtual;
2226
2227 if (hydra->kernel_interface->get_address_by_ts(hydra->kernel_interface,
2228 in->dst_ts, &host, &is_virtual) != SUCCESS)
2229 {
2230 return FALSE;
2231 }
2232
2233 /* switch src/dst, as we handle an IN policy */
2234 src = in->generic.sa->dst;
2235 dst = in->generic.sa->src;
2236
2237 INIT(route,
2238 .prefixlen = policy->src.mask,
2239 .src_ip = host,
2240 .dst_net = chunk_clone(policy->src.net->get_address(policy->src.net)),
2241 );
2242
2243 if (!dst->is_anyaddr(dst))
2244 {
2245 route->gateway = hydra->kernel_interface->get_nexthop(
2246 hydra->kernel_interface, dst, -1, src);
2247
2248 /* if the IP is virtual, we install the route over the interface it has
2249 * been installed on. Otherwise we use the interface we use for IKE, as
2250 * this is required for example on Linux. */
2251 if (is_virtual)
2252 {
2253 src = route->src_ip;
2254 }
2255 }
2256 else
2257 { /* for shunt policies */
2258 route->gateway = hydra->kernel_interface->get_nexthop(
2259 hydra->kernel_interface, policy->src.net,
2260 policy->src.mask, route->src_ip);
2261
2262 /* we don't have a source address, use the address we found */
2263 src = route->src_ip;
2264 }
2265
2266 /* get interface for route, using source address */
2267 if (!hydra->kernel_interface->get_interface(hydra->kernel_interface,
2268 src, &route->if_name))
2269 {
2270 route_entry_destroy(route);
2271 return FALSE;
2272 }
2273
2274 if (policy->route)
2275 {
2276 old = policy->route;
2277
2278 if (route_entry_equals(old, route))
2279 { /* such a route already exists */
2280 route_entry_destroy(route);
2281 return TRUE;
2282 }
2283 /* uninstall previously installed route */
2284 if (hydra->kernel_interface->del_route(hydra->kernel_interface,
2285 old->dst_net, old->prefixlen, old->gateway,
2286 old->src_ip, old->if_name) != SUCCESS)
2287 {
2288 DBG1(DBG_KNL, "error uninstalling route installed with policy "
2289 "%R === %R %N", in->src_ts, in->dst_ts,
2290 policy_dir_names, policy->direction);
2291 }
2292 route_entry_destroy(old);
2293 policy->route = NULL;
2294 }
2295
2296 /* if remote traffic selector covers the IKE peer, add an exclude route */
2297 if (hydra->kernel_interface->get_features(
2298 hydra->kernel_interface) & KERNEL_REQUIRE_EXCLUDE_ROUTE)
2299 {
2300 if (in->src_ts->is_host(in->src_ts, dst))
2301 {
2302 DBG1(DBG_KNL, "can't install route for %R === %R %N, conflicts "
2303 "with IKE traffic", in->src_ts, in->dst_ts, policy_dir_names,
2304 policy->direction);
2305 route_entry_destroy(route);
2306 return FALSE;
2307 }
2308 if (in->src_ts->includes(in->src_ts, dst))
2309 {
2310 add_exclude_route(this, route, in->generic.sa->dst, dst);
2311 }
2312 }
2313
2314 DBG2(DBG_KNL, "installing route: %R via %H src %H dev %s",
2315 in->src_ts, route->gateway, route->src_ip, route->if_name);
2316
2317 switch (hydra->kernel_interface->add_route(hydra->kernel_interface,
2318 route->dst_net, route->prefixlen, route->gateway,
2319 route->src_ip, route->if_name))
2320 {
2321 case ALREADY_DONE:
2322 /* route exists, do not uninstall */
2323 remove_exclude_route(this, route);
2324 route_entry_destroy(route);
2325 return TRUE;
2326 case SUCCESS:
2327 /* cache the installed route */
2328 policy->route = route;
2329 return TRUE;
2330 default:
2331 DBG1(DBG_KNL, "installing route failed: %R via %H src %H dev %s",
2332 in->src_ts, route->gateway, route->src_ip, route->if_name);
2333 remove_exclude_route(this, route);
2334 route_entry_destroy(route);
2335 return FALSE;
2336 }
2337 }
2338
2339 /**
2340 * Add or update a policy in the kernel.
2341 *
2342 * Note: The mutex has to be locked when entering this function.
2343 */
2344 static status_t add_policy_internal(private_kernel_pfkey_ipsec_t *this,
2345 policy_entry_t *policy, policy_sa_t *mapping, bool update)
2346 {
2347 unsigned char request[PFKEY_BUFFER_SIZE];
2348 struct sadb_msg *msg, *out;
2349 struct sadb_x_policy *pol;
2350 struct sadb_x_ipsecrequest *req;
2351 ipsec_sa_t *ipsec = mapping->sa;
2352 pfkey_msg_t response;
2353 size_t len;
2354 ipsec_mode_t proto_mode;
2355
2356 memset(&request, 0, sizeof(request));
2357
2358 msg = (struct sadb_msg*)request;
2359 msg->sadb_msg_version = PF_KEY_V2;
2360 msg->sadb_msg_type = update ? SADB_X_SPDUPDATE : SADB_X_SPDADD;
2361 msg->sadb_msg_satype = 0;
2362 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2363
2364 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2365 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2366 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2367 pol->sadb_x_policy_id = 0;
2368 pol->sadb_x_policy_dir = dir2kernel(policy->direction);
2369 pol->sadb_x_policy_type = type2kernel(mapping->type);
2370 #ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY
2371 pol->sadb_x_policy_priority = mapping->priority;
2372 #endif
2373
2374 /* one or more sadb_x_ipsecrequest extensions are added to the
2375 * sadb_x_policy extension */
2376 proto_mode = ipsec->cfg.mode;
2377
2378 req = (struct sadb_x_ipsecrequest*)(pol + 1);
2379
2380 if (ipsec->cfg.ipcomp.transform != IPCOMP_NONE)
2381 {
2382 req->sadb_x_ipsecrequest_proto = IPPROTO_COMP;
2383
2384 /* !!! the length here MUST be in octets instead of 64 bit words */
2385 req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2386 req->sadb_x_ipsecrequest_mode = mode2kernel(ipsec->cfg.mode);
2387 req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2388 req->sadb_x_ipsecrequest_level = (policy->direction == POLICY_OUT) ?
2389 IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_USE;
2390 if (ipsec->cfg.mode == MODE_TUNNEL)
2391 {
2392 len = hostcpy(req + 1, ipsec->src, FALSE);
2393 req->sadb_x_ipsecrequest_len += len;
2394 len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2395 req->sadb_x_ipsecrequest_len += len;
2396 /* use transport mode for other SAs */
2397 proto_mode = MODE_TRANSPORT;
2398 }
2399
2400 pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2401 req = (struct sadb_x_ipsecrequest*)((char*)(req) +
2402 req->sadb_x_ipsecrequest_len);
2403 }
2404
2405 req->sadb_x_ipsecrequest_proto = ipsec->cfg.esp.use ? IPPROTO_ESP
2406 : IPPROTO_AH;
2407 /* !!! the length here MUST be in octets instead of 64 bit words */
2408 req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2409 req->sadb_x_ipsecrequest_mode = mode2kernel(proto_mode);
2410 req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2411 req->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2412 if (proto_mode == MODE_TUNNEL)
2413 {
2414 len = hostcpy(req + 1, ipsec->src, FALSE);
2415 req->sadb_x_ipsecrequest_len += len;
2416 len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2417 req->sadb_x_ipsecrequest_len += len;
2418 }
2419
2420 pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2421 PFKEY_EXT_ADD(msg, pol);
2422
2423 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2424 policy->src.mask, TRUE);
2425 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2426 policy->dst.mask, TRUE);
2427
2428 #ifdef __FreeBSD__
2429 { /* on FreeBSD a lifetime has to be defined to be able to later query
2430 * the current use time. */
2431 struct sadb_lifetime *lft;
2432 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
2433 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2434 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
2435 lft->sadb_lifetime_addtime = LONG_MAX;
2436 PFKEY_EXT_ADD(msg, lft);
2437 }
2438 #endif
2439
2440 this->mutex->unlock(this->mutex);
2441
2442 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2443 {
2444 return FAILED;
2445 }
2446 else if (out->sadb_msg_errno)
2447 {
2448 DBG1(DBG_KNL, "unable to %s policy: %s (%d)",
2449 update ? "update" : "add", strerror(out->sadb_msg_errno),
2450 out->sadb_msg_errno);
2451 free(out);
2452 return FAILED;
2453 }
2454 else if (parse_pfkey_message(out, &response) != SUCCESS)
2455 {
2456 DBG1(DBG_KNL, "unable to %s policy: parsing response from kernel "
2457 "failed", update ? "update" : "add");
2458 free(out);
2459 return FAILED;
2460 }
2461
2462 /* we try to find the policy again and update the kernel index */
2463 this->mutex->lock(this->mutex);
2464 if (this->policies->find_first(this->policies, NULL,
2465 (void**)&policy) != SUCCESS)
2466 {
2467 DBG2(DBG_KNL, "unable to update index, the policy is already gone, "
2468 "ignoring");
2469 this->mutex->unlock(this->mutex);
2470 free(out);
2471 return SUCCESS;
2472 }
2473 policy->index = response.x_policy->sadb_x_policy_id;
2474 free(out);
2475
2476 /* install a route, if:
2477 * - this is an inbound policy (to just get one for each child)
2478 * - we are in tunnel mode or install a bypass policy
2479 * - routing is not disabled via strongswan.conf
2480 */
2481 if (policy->direction == POLICY_IN && this->install_routes &&
2482 (mapping->type != POLICY_IPSEC || ipsec->cfg.mode != MODE_TRANSPORT))
2483 {
2484 install_route(this, policy, (policy_sa_in_t*)mapping);
2485 }
2486 this->mutex->unlock(this->mutex);
2487 return SUCCESS;
2488 }
2489
2490 METHOD(kernel_ipsec_t, add_policy, status_t,
2491 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
2492 traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
2493 policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa,
2494 mark_t mark, policy_priority_t priority)
2495 {
2496 policy_entry_t *policy, *found = NULL;
2497 policy_sa_t *assigned_sa, *current_sa;
2498 enumerator_t *enumerator;
2499 bool update = TRUE;
2500
2501 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2502 { /* FWD policies are not supported on all platforms */
2503 return SUCCESS;
2504 }
2505
2506 /* create a policy */
2507 policy = create_policy_entry(src_ts, dst_ts, direction);
2508
2509 /* find a matching policy */
2510 this->mutex->lock(this->mutex);
2511 if (this->policies->find_first(this->policies,
2512 (linked_list_match_t)policy_entry_equals,
2513 (void**)&found, policy) == SUCCESS)
2514 { /* use existing policy */
2515 DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing "
2516 "refcount", src_ts, dst_ts, policy_dir_names, direction);
2517 policy_entry_destroy(policy, this);
2518 policy = found;
2519 }
2520 else
2521 { /* use the new one, if we have no such policy */
2522 this->policies->insert_first(this->policies, policy);
2523 policy->used_by = linked_list_create();
2524 }
2525
2526 /* cache the assigned IPsec SA */
2527 assigned_sa = policy_sa_create(this, direction, type, src, dst, src_ts,
2528 dst_ts, sa);
2529 assigned_sa->priority = get_priority(policy, priority);
2530
2531 /* insert the SA according to its priority */
2532 enumerator = policy->used_by->create_enumerator(policy->used_by);
2533 while (enumerator->enumerate(enumerator, (void**)&current_sa))
2534 {
2535 if (current_sa->priority >= assigned_sa->priority)
2536 {
2537 break;
2538 }
2539 update = FALSE;
2540 }
2541 policy->used_by->insert_before(policy->used_by, enumerator, assigned_sa);
2542 enumerator->destroy(enumerator);
2543
2544 if (!update)
2545 { /* we don't update the policy if the priority is lower than that of the
2546 * currently installed one */
2547 this->mutex->unlock(this->mutex);
2548 return SUCCESS;
2549 }
2550
2551 DBG2(DBG_KNL, "%s policy %R === %R %N",
2552 found ? "updating" : "adding", src_ts, dst_ts,
2553 policy_dir_names, direction);
2554
2555 if (add_policy_internal(this, policy, assigned_sa, found) != SUCCESS)
2556 {
2557 DBG1(DBG_KNL, "unable to %s policy %R === %R %N",
2558 found ? "update" : "add", src_ts, dst_ts,
2559 policy_dir_names, direction);
2560 return FAILED;
2561 }
2562 return SUCCESS;
2563 }
2564
2565 METHOD(kernel_ipsec_t, query_policy, status_t,
2566 private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts,
2567 traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
2568 time_t *use_time)
2569 {
2570 unsigned char request[PFKEY_BUFFER_SIZE];
2571 struct sadb_msg *msg, *out;
2572 struct sadb_x_policy *pol;
2573 policy_entry_t *policy, *found = NULL;
2574 pfkey_msg_t response;
2575 size_t len;
2576
2577 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2578 { /* FWD policies are not supported on all platforms */
2579 return NOT_FOUND;
2580 }
2581
2582 DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts,
2583 policy_dir_names, direction);
2584
2585 /* create a policy */
2586 policy = create_policy_entry(src_ts, dst_ts, direction);
2587
2588 /* find a matching policy */
2589 this->mutex->lock(this->mutex);
2590 if (this->policies->find_first(this->policies,
2591 (linked_list_match_t)policy_entry_equals,
2592 (void**)&found, policy) != SUCCESS)
2593 {
2594 DBG1(DBG_KNL, "querying policy %R === %R %N failed, not found", src_ts,
2595 dst_ts, policy_dir_names, direction);
2596 policy_entry_destroy(policy, this);
2597 this->mutex->unlock(this->mutex);
2598 return NOT_FOUND;
2599 }
2600 policy_entry_destroy(policy, this);
2601 policy = found;
2602
2603 memset(&request, 0, sizeof(request));
2604
2605 msg = (struct sadb_msg*)request;
2606 msg->sadb_msg_version = PF_KEY_V2;
2607 msg->sadb_msg_type = SADB_X_SPDGET;
2608 msg->sadb_msg_satype = 0;
2609 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2610
2611 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2612 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2613 pol->sadb_x_policy_id = policy->index;
2614 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2615 pol->sadb_x_policy_dir = dir2kernel(direction);
2616 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2617 PFKEY_EXT_ADD(msg, pol);
2618
2619 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2620 policy->src.mask, TRUE);
2621 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2622 policy->dst.mask, TRUE);
2623
2624 this->mutex->unlock(this->mutex);
2625
2626 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2627 {
2628 DBG1(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts,
2629 policy_dir_names, direction);
2630 return FAILED;
2631 }
2632 else if (out->sadb_msg_errno)
2633 {
2634 DBG1(DBG_KNL, "unable to query policy %R === %R %N: %s (%d)", src_ts,
2635 dst_ts, policy_dir_names, direction,
2636 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2637 free(out);
2638 return FAILED;
2639 }
2640 else if (parse_pfkey_message(out, &response) != SUCCESS)
2641 {
2642 DBG1(DBG_KNL, "unable to query policy %R === %R %N: parsing response "
2643 "from kernel failed", src_ts, dst_ts, policy_dir_names,
2644 direction);
2645 free(out);
2646 return FAILED;
2647 }
2648 else if (response.lft_current == NULL)
2649 {
2650 DBG2(DBG_KNL, "unable to query policy %R === %R %N: kernel reports no "
2651 "use time", src_ts, dst_ts, policy_dir_names, direction);
2652 free(out);
2653 return FAILED;
2654 }
2655
2656 /* we need the monotonic time, but the kernel returns system time. */
2657 if (response.lft_current->sadb_lifetime_usetime)
2658 {
2659 *use_time = time_monotonic(NULL) -
2660 (time(NULL) - response.lft_current->sadb_lifetime_usetime);
2661 }
2662 else
2663 {
2664 *use_time = 0;
2665 }
2666 free(out);
2667 return SUCCESS;
2668 }
2669
2670 METHOD(kernel_ipsec_t, del_policy, status_t,
2671 private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts,
2672 traffic_selector_t *dst_ts, policy_dir_t direction, u_int32_t reqid,
2673 mark_t mark, policy_priority_t prio)
2674 {
2675 unsigned char request[PFKEY_BUFFER_SIZE];
2676 struct sadb_msg *msg, *out;
2677 struct sadb_x_policy *pol;
2678 policy_entry_t *policy, *found = NULL;
2679 policy_sa_t *mapping, *to_remove = NULL;
2680 enumerator_t *enumerator;
2681 bool first = TRUE, is_installed = TRUE;
2682 u_int32_t priority;
2683 size_t len;
2684
2685 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2686 { /* FWD policies are not supported on all platforms */
2687 return SUCCESS;
2688 }
2689
2690 DBG2(DBG_KNL, "deleting policy %R === %R %N", src_ts, dst_ts,
2691 policy_dir_names, direction);
2692
2693 /* create a policy */
2694 policy = create_policy_entry(src_ts, dst_ts, direction);
2695
2696 /* find a matching policy */
2697 this->mutex->lock(this->mutex);
2698 if (this->policies->find_first(this->policies,
2699 (linked_list_match_t)policy_entry_equals,
2700 (void**)&found, policy) != SUCCESS)
2701 {
2702 DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", src_ts,
2703 dst_ts, policy_dir_names, direction);
2704 policy_entry_destroy(policy, this);
2705 this->mutex->unlock(this->mutex);
2706 return NOT_FOUND;
2707 }
2708 policy_entry_destroy(policy, this);
2709 policy = found;
2710
2711 /* remove mapping to SA by reqid and priority, if multiple match, which
2712 * could happen when rekeying due to an address change, remove the oldest */
2713 priority = get_priority(policy, prio);
2714 enumerator = policy->used_by->create_enumerator(policy->used_by);
2715 while (enumerator->enumerate(enumerator, (void**)&mapping))
2716 {
2717 if (reqid == mapping->sa->cfg.reqid && priority == mapping->priority)
2718 {
2719 to_remove = mapping;
2720 is_installed = first;
2721 }
2722 else if (priority < mapping->priority)
2723 {
2724 break;
2725 }
2726 first = FALSE;
2727 }
2728 enumerator->destroy(enumerator);
2729 if (!to_remove)
2730 { /* sanity check */
2731 this->mutex->unlock(this->mutex);
2732 return SUCCESS;
2733 }
2734 policy->used_by->remove(policy->used_by, to_remove, NULL);
2735 mapping = to_remove;
2736
2737 if (policy->used_by->get_count(policy->used_by) > 0)
2738 { /* policy is used by more SAs, keep in kernel */
2739 DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
2740 policy_sa_destroy(mapping, &direction, this);
2741
2742 if (!is_installed)
2743 { /* no need to update as the policy was not installed for this SA */
2744 this->mutex->unlock(this->mutex);
2745 return SUCCESS;
2746 }
2747
2748 DBG2(DBG_KNL, "updating policy %R === %R %N", src_ts, dst_ts,
2749 policy_dir_names, direction);
2750 policy->used_by->get_first(policy->used_by, (void**)&mapping);
2751 if (add_policy_internal(this, policy, mapping, TRUE) != SUCCESS)
2752 {
2753 DBG1(DBG_KNL, "unable to update policy %R === %R %N",
2754 src_ts, dst_ts, policy_dir_names, direction);
2755 return FAILED;
2756 }
2757 return SUCCESS;
2758 }
2759
2760 memset(&request, 0, sizeof(request));
2761
2762 msg = (struct sadb_msg*)request;
2763 msg->sadb_msg_version = PF_KEY_V2;
2764 msg->sadb_msg_type = SADB_X_SPDDELETE;
2765 msg->sadb_msg_satype = 0;
2766 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2767
2768 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2769 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2770 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2771 pol->sadb_x_policy_dir = dir2kernel(direction);
2772 pol->sadb_x_policy_type = type2kernel(mapping->type);
2773 PFKEY_EXT_ADD(msg, pol);
2774
2775 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2776 policy->src.mask, TRUE);
2777 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2778 policy->dst.mask, TRUE);
2779
2780 if (policy->route)
2781 {
2782 route_entry_t *route = policy->route;
2783 if (hydra->kernel_interface->del_route(hydra->kernel_interface,
2784 route->dst_net, route->prefixlen, route->gateway,
2785 route->src_ip, route->if_name) != SUCCESS)
2786 {
2787 DBG1(DBG_KNL, "error uninstalling route installed with "
2788 "policy %R === %R %N", src_ts, dst_ts,
2789 policy_dir_names, direction);
2790 }
2791 remove_exclude_route(this, route);
2792 }
2793
2794 this->policies->remove(this->policies, found, NULL);
2795 policy_sa_destroy(mapping, &direction, this);
2796 policy_entry_destroy(policy, this);
2797 this->mutex->unlock(this->mutex);
2798
2799 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2800 {
2801 DBG1(DBG_KNL, "unable to delete policy %R === %R %N", src_ts, dst_ts,
2802 policy_dir_names, direction);
2803 return FAILED;
2804 }
2805 else if (out->sadb_msg_errno)
2806 {
2807 DBG1(DBG_KNL, "unable to delete policy %R === %R %N: %s (%d)", src_ts,
2808 dst_ts, policy_dir_names, direction,
2809 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2810 free(out);
2811 return FAILED;
2812 }
2813 free(out);
2814 return SUCCESS;
2815 }
2816
2817 METHOD(kernel_ipsec_t, flush_policies, status_t,
2818 private_kernel_pfkey_ipsec_t *this)
2819 {
2820 unsigned char request[PFKEY_BUFFER_SIZE];
2821 struct sadb_msg *msg, *out;
2822 size_t len;
2823
2824 memset(&request, 0, sizeof(request));
2825
2826 DBG2(DBG_KNL, "flushing all policies from SPD");
2827
2828 msg = (struct sadb_msg*)request;
2829 msg->sadb_msg_version = PF_KEY_V2;
2830 msg->sadb_msg_type = SADB_X_SPDFLUSH;
2831 msg->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2832 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2833
2834 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2835 {
2836 DBG1(DBG_KNL, "unable to flush SPD entries");
2837 return FAILED;
2838 }
2839 else if (out->sadb_msg_errno)
2840 {
2841 DBG1(DBG_KNL, "unable to flush SPD entries: %s (%d)",
2842 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2843 free(out);
2844 return FAILED;
2845 }
2846 free(out);
2847 return SUCCESS;
2848 }
2849
2850 /**
2851 * Register a socket for ACQUIRE/EXPIRE messages
2852 */
2853 static status_t register_pfkey_socket(private_kernel_pfkey_ipsec_t *this,
2854 u_int8_t satype)
2855 {
2856 unsigned char request[PFKEY_BUFFER_SIZE];
2857 struct sadb_msg *msg, *out;
2858 size_t len;
2859
2860 memset(&request, 0, sizeof(request));
2861
2862 msg = (struct sadb_msg*)request;
2863 msg->sadb_msg_version = PF_KEY_V2;
2864 msg->sadb_msg_type = SADB_REGISTER;
2865 msg->sadb_msg_satype = satype;
2866 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2867
2868 if (pfkey_send_socket(this, this->socket_events, msg, &out, &len) != SUCCESS)
2869 {
2870 DBG1(DBG_KNL, "unable to register PF_KEY socket");
2871 return FAILED;
2872 }
2873 else if (out->sadb_msg_errno)
2874 {
2875 DBG1(DBG_KNL, "unable to register PF_KEY socket: %s (%d)",
2876 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2877 free(out);
2878 return FAILED;
2879 }
2880 free(out);
2881 return SUCCESS;
2882 }
2883
2884 METHOD(kernel_ipsec_t, bypass_socket, bool,
2885 private_kernel_pfkey_ipsec_t *this, int fd, int family)
2886 {
2887 struct sadb_x_policy policy;
2888 u_int sol, ipsec_policy;
2889
2890 switch (family)
2891 {
2892 case AF_INET:
2893 {
2894 sol = SOL_IP;
2895 ipsec_policy = IP_IPSEC_POLICY;
2896 break;
2897 }
2898 case AF_INET6:
2899 {
2900 sol = SOL_IPV6;
2901 ipsec_policy = IPV6_IPSEC_POLICY;
2902 break;
2903 }
2904 default:
2905 return FALSE;
2906 }
2907
2908 memset(&policy, 0, sizeof(policy));
2909 policy.sadb_x_policy_len = sizeof(policy) / sizeof(u_int64_t);
2910 policy.sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2911 policy.sadb_x_policy_type = IPSEC_POLICY_BYPASS;
2912
2913 policy.sadb_x_policy_dir = IPSEC_DIR_OUTBOUND;
2914 if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy