kernel-netlink: Respect kernel routing priorities for IKE routes
[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;
1300 host_t *dst;
1301 bool hard;
1302
1303 DBG2(DBG_KNL, "received an SADB_EXPIRE");
1304
1305 if (parse_pfkey_message(msg, &response) != SUCCESS)
1306 {
1307 DBG1(DBG_KNL, "parsing SADB_EXPIRE from kernel failed");
1308 return;
1309 }
1310
1311 protocol = satype2proto(msg->sadb_msg_satype);
1312 spi = response.sa->sadb_sa_spi;
1313 hard = response.lft_hard != NULL;
1314
1315 if (protocol == IPPROTO_ESP || protocol == IPPROTO_AH)
1316 {
1317 dst = host_create_from_sockaddr((sockaddr_t*)(response.dst + 1));
1318 if (dst)
1319 {
1320 hydra->kernel_interface->expire(hydra->kernel_interface, protocol,
1321 spi, dst, hard);
1322 dst->destroy(dst);
1323 }
1324 }
1325 }
1326
1327 #ifdef SADB_X_MIGRATE
1328 /**
1329 * Process a SADB_X_MIGRATE message from the kernel
1330 */
1331 static void process_migrate(private_kernel_pfkey_ipsec_t *this,
1332 struct sadb_msg* msg)
1333 {
1334 pfkey_msg_t response;
1335 traffic_selector_t *src_ts, *dst_ts;
1336 policy_dir_t dir;
1337 u_int32_t reqid = 0;
1338 host_t *local = NULL, *remote = NULL;
1339
1340 DBG2(DBG_KNL, "received an SADB_X_MIGRATE");
1341
1342 if (parse_pfkey_message(msg, &response) != SUCCESS)
1343 {
1344 DBG1(DBG_KNL, "parsing SADB_X_MIGRATE from kernel failed");
1345 return;
1346 }
1347 src_ts = sadb_address2ts(response.src);
1348 dst_ts = sadb_address2ts(response.dst);
1349 dir = kernel2dir(response.x_policy->sadb_x_policy_dir);
1350 DBG2(DBG_KNL, " policy %R === %R %N, id %u", src_ts, dst_ts,
1351 policy_dir_names, dir);
1352
1353 /* SADB_X_EXT_KMADDRESS is not present in unpatched kernels < 2.6.28 */
1354 if (response.x_kmaddress)
1355 {
1356 sockaddr_t *local_addr, *remote_addr;
1357 u_int32_t local_len;
1358
1359 local_addr = (sockaddr_t*)&response.x_kmaddress[1];
1360 local = host_create_from_sockaddr(local_addr);
1361 local_len = (local_addr->sa_family == AF_INET6)?
1362 sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
1363 remote_addr = (sockaddr_t*)((u_int8_t*)local_addr + local_len);
1364 remote = host_create_from_sockaddr(remote_addr);
1365 DBG2(DBG_KNL, " kmaddress: %H...%H", local, remote);
1366 }
1367
1368 if (src_ts && dst_ts && local && remote)
1369 {
1370 hydra->kernel_interface->migrate(hydra->kernel_interface, reqid,
1371 src_ts, dst_ts, dir, local, remote);
1372 }
1373 else
1374 {
1375 DESTROY_IF(src_ts);
1376 DESTROY_IF(dst_ts);
1377 DESTROY_IF(local);
1378 DESTROY_IF(remote);
1379 }
1380 }
1381 #endif /*SADB_X_MIGRATE*/
1382
1383 #ifdef SADB_X_NAT_T_NEW_MAPPING
1384 /**
1385 * Process a SADB_X_NAT_T_NEW_MAPPING message from the kernel
1386 */
1387 static void process_mapping(private_kernel_pfkey_ipsec_t *this,
1388 struct sadb_msg* msg)
1389 {
1390 pfkey_msg_t response;
1391 u_int32_t spi;
1392 sockaddr_t *sa;
1393 host_t *dst, *new;
1394
1395 DBG2(DBG_KNL, "received an SADB_X_NAT_T_NEW_MAPPING");
1396
1397 if (parse_pfkey_message(msg, &response) != SUCCESS)
1398 {
1399 DBG1(DBG_KNL, "parsing SADB_X_NAT_T_NEW_MAPPING from kernel failed");
1400 return;
1401 }
1402
1403 if (!response.x_sa2)
1404 {
1405 DBG1(DBG_KNL, "received SADB_X_NAT_T_NEW_MAPPING is missing required "
1406 "information");
1407 return;
1408 }
1409
1410 spi = response.sa->sadb_sa_spi;
1411
1412 if (satype2proto(msg->sadb_msg_satype) != IPPROTO_ESP)
1413 {
1414 return;
1415 }
1416
1417 sa = (sockaddr_t*)(response.dst + 1);
1418 dst = host_create_from_sockaddr(sa);
1419 switch (sa->sa_family)
1420 {
1421 case AF_INET:
1422 {
1423 struct sockaddr_in *sin = (struct sockaddr_in*)sa;
1424 sin->sin_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1425 break;
1426 }
1427 case AF_INET6:
1428 {
1429 struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa;
1430 sin6->sin6_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1431 break;
1432 }
1433 default:
1434 break;
1435 }
1436 if (dst)
1437 {
1438 new = host_create_from_sockaddr(sa);
1439 if (new)
1440 {
1441 hydra->kernel_interface->mapping(hydra->kernel_interface,
1442 IPPROTO_ESP, spi, dst, new);
1443 new->destroy(new);
1444 }
1445 dst->destroy(dst);
1446 }
1447 }
1448 #endif /*SADB_X_NAT_T_NEW_MAPPING*/
1449
1450 /**
1451 * Receives events from kernel
1452 */
1453 static bool receive_events(private_kernel_pfkey_ipsec_t *this, int fd,
1454 watcher_event_t event)
1455 {
1456 unsigned char buf[PFKEY_BUFFER_SIZE];
1457 struct sadb_msg *msg = (struct sadb_msg*)buf;
1458 int len;
1459
1460 len = recvfrom(this->socket_events, buf, sizeof(buf), MSG_DONTWAIT, NULL, 0);
1461 if (len < 0)
1462 {
1463 switch (errno)
1464 {
1465 case EINTR:
1466 /* interrupted, try again */
1467 return TRUE;
1468 case EAGAIN:
1469 /* no data ready, select again */
1470 return TRUE;
1471 default:
1472 DBG1(DBG_KNL, "unable to receive from PF_KEY event socket");
1473 sleep(1);
1474 return TRUE;
1475 }
1476 }
1477
1478 if (len < sizeof(struct sadb_msg) ||
1479 msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
1480 {
1481 DBG2(DBG_KNL, "received corrupted PF_KEY message");
1482 return TRUE;
1483 }
1484 if (msg->sadb_msg_pid != 0)
1485 { /* not from kernel. not interested, try another one */
1486 return TRUE;
1487 }
1488 if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
1489 {
1490 DBG1(DBG_KNL, "buffer was too small to receive the complete "
1491 "PF_KEY message");
1492 return TRUE;
1493 }
1494
1495 switch (msg->sadb_msg_type)
1496 {
1497 case SADB_ACQUIRE:
1498 process_acquire(this, msg);
1499 break;
1500 case SADB_EXPIRE:
1501 process_expire(this, msg);
1502 break;
1503 #ifdef SADB_X_MIGRATE
1504 case SADB_X_MIGRATE:
1505 process_migrate(this, msg);
1506 break;
1507 #endif /*SADB_X_MIGRATE*/
1508 #ifdef SADB_X_NAT_T_NEW_MAPPING
1509 case SADB_X_NAT_T_NEW_MAPPING:
1510 process_mapping(this, msg);
1511 break;
1512 #endif /*SADB_X_NAT_T_NEW_MAPPING*/
1513 default:
1514 break;
1515 }
1516
1517 return TRUE;
1518 }
1519
1520 /**
1521 * Get an SPI for a specific protocol from the kernel.
1522 */
1523
1524 static status_t get_spi_internal(private_kernel_pfkey_ipsec_t *this,
1525 host_t *src, host_t *dst, u_int8_t proto, u_int32_t min, u_int32_t max,
1526 u_int32_t *spi)
1527 {
1528 unsigned char request[PFKEY_BUFFER_SIZE];
1529 struct sadb_msg *msg, *out;
1530 struct sadb_spirange *range;
1531 pfkey_msg_t response;
1532 u_int32_t received_spi = 0;
1533 size_t len;
1534
1535 memset(&request, 0, sizeof(request));
1536
1537 msg = (struct sadb_msg*)request;
1538 msg->sadb_msg_version = PF_KEY_V2;
1539 msg->sadb_msg_type = SADB_GETSPI;
1540 msg->sadb_msg_satype = proto2satype(proto);
1541 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1542
1543 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1544 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1545
1546 range = (struct sadb_spirange*)PFKEY_EXT_ADD_NEXT(msg);
1547 range->sadb_spirange_exttype = SADB_EXT_SPIRANGE;
1548 range->sadb_spirange_len = PFKEY_LEN(sizeof(struct sadb_spirange));
1549 range->sadb_spirange_min = min;
1550 range->sadb_spirange_max = max;
1551 PFKEY_EXT_ADD(msg, range);
1552
1553 if (pfkey_send(this, msg, &out, &len) == SUCCESS)
1554 {
1555 if (out->sadb_msg_errno)
1556 {
1557 DBG1(DBG_KNL, "allocating SPI failed: %s (%d)",
1558 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
1559 }
1560 else if (parse_pfkey_message(out, &response) == SUCCESS)
1561 {
1562 received_spi = response.sa->sadb_sa_spi;
1563 }
1564 free(out);
1565 }
1566
1567 if (received_spi == 0)
1568 {
1569 return FAILED;
1570 }
1571
1572 *spi = received_spi;
1573 return SUCCESS;
1574 }
1575
1576 METHOD(kernel_ipsec_t, get_spi, status_t,
1577 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1578 u_int8_t protocol, u_int32_t *spi)
1579 {
1580 if (get_spi_internal(this, src, dst, protocol,
1581 0xc0000000, 0xcFFFFFFF, spi) != SUCCESS)
1582 {
1583 DBG1(DBG_KNL, "unable to get SPI");
1584 return FAILED;
1585 }
1586
1587 DBG2(DBG_KNL, "got SPI %.8x", ntohl(*spi));
1588 return SUCCESS;
1589 }
1590
1591 METHOD(kernel_ipsec_t, get_cpi, status_t,
1592 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1593 u_int16_t *cpi)
1594 {
1595 u_int32_t received_spi = 0;
1596
1597 DBG2(DBG_KNL, "getting CPI");
1598
1599 if (get_spi_internal(this, src, dst, IPPROTO_COMP,
1600 0x100, 0xEFFF, &received_spi) != SUCCESS)
1601 {
1602 DBG1(DBG_KNL, "unable to get CPI");
1603 return FAILED;
1604 }
1605
1606 *cpi = htons((u_int16_t)ntohl(received_spi));
1607
1608 DBG2(DBG_KNL, "got CPI %.4x", ntohs(*cpi));
1609 return SUCCESS;
1610 }
1611
1612 METHOD(kernel_ipsec_t, add_sa, status_t,
1613 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, u_int32_t spi,
1614 u_int8_t protocol, u_int32_t reqid, mark_t mark, u_int32_t tfc,
1615 lifetime_cfg_t *lifetime, u_int16_t enc_alg, chunk_t enc_key,
1616 u_int16_t int_alg, chunk_t int_key, ipsec_mode_t mode,
1617 u_int16_t ipcomp, u_int16_t cpi, u_int32_t replay_window,
1618 bool initiator, bool encap, bool esn, bool inbound,
1619 linked_list_t *src_ts, linked_list_t *dst_ts)
1620 {
1621 unsigned char request[PFKEY_BUFFER_SIZE];
1622 struct sadb_msg *msg, *out;
1623 struct sadb_sa *sa;
1624 struct sadb_x_sa2 *sa2;
1625 struct sadb_lifetime *lft;
1626 struct sadb_key *key;
1627 size_t len;
1628
1629 /* if IPComp is used, we install an additional IPComp SA. if the cpi is 0
1630 * we are in the recursive call below */
1631 if (ipcomp != IPCOMP_NONE && cpi != 0)
1632 {
1633 lifetime_cfg_t lft = {{0,0,0},{0,0,0},{0,0,0}};
1634 add_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, reqid, mark,
1635 tfc, &lft, ENCR_UNDEFINED, chunk_empty, AUTH_UNDEFINED,
1636 chunk_empty, mode, ipcomp, 0, 0, FALSE, FALSE, FALSE, inbound,
1637 NULL, NULL);
1638 ipcomp = IPCOMP_NONE;
1639 /* use transport mode ESP SA, IPComp uses tunnel mode */
1640 mode = MODE_TRANSPORT;
1641 }
1642
1643 if (inbound)
1644 {
1645 /* As we didn't know the reqid during SPI allocation, we used reqid
1646 * zero. Unfortunately we can't SADB_UPDATE to the new reqid, hence we
1647 * have to delete the SPI allocation state manually. The reqid
1648 * selector does not count for that, therefore we have to delete
1649 * that state before installing the new SA to avoid deleting the
1650 * the new state after installing it. */
1651 mark_t zeromark = {0, 0};
1652
1653 if (this->public.interface.del_sa(&this->public.interface,
1654 src, dst, spi, protocol, 0, zeromark) != SUCCESS)
1655 {
1656 DBG1(DBG_KNL, "deleting SPI allocation SA failed");
1657 }
1658 }
1659
1660 memset(&request, 0, sizeof(request));
1661
1662 DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u}",
1663 ntohl(spi), reqid);
1664
1665 msg = (struct sadb_msg*)request;
1666 msg->sadb_msg_version = PF_KEY_V2;
1667 msg->sadb_msg_type = SADB_ADD;
1668 msg->sadb_msg_satype = proto2satype(protocol);
1669 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1670
1671 #ifdef __APPLE__
1672 if (encap)
1673 {
1674 struct sadb_sa_2 *sa_2;
1675 sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
1676 sa_2->sadb_sa_natt_port = dst->get_port(dst);
1677 sa = &sa_2->sa;
1678 sa->sadb_sa_flags |= SADB_X_EXT_NATT;
1679 len = sizeof(struct sadb_sa_2);
1680 }
1681 else
1682 #endif
1683 {
1684 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1685 len = sizeof(struct sadb_sa);
1686 }
1687 sa->sadb_sa_exttype = SADB_EXT_SA;
1688 sa->sadb_sa_len = PFKEY_LEN(len);
1689 sa->sadb_sa_spi = spi;
1690 if (protocol == IPPROTO_COMP)
1691 {
1692 sa->sadb_sa_encrypt = lookup_algorithm(COMPRESSION_ALGORITHM, ipcomp);
1693 }
1694 else
1695 {
1696 /* Linux interprets sadb_sa_replay as number of packets/bits in the
1697 * replay window, whereas on BSD it's the size of the window in bytes */
1698 #ifdef __linux__
1699 sa->sadb_sa_replay = min(replay_window, 32);
1700 #else
1701 sa->sadb_sa_replay = (replay_window + 7) / 8;
1702 #endif
1703 sa->sadb_sa_auth = lookup_algorithm(INTEGRITY_ALGORITHM, int_alg);
1704 sa->sadb_sa_encrypt = lookup_algorithm(ENCRYPTION_ALGORITHM, enc_alg);
1705 }
1706 PFKEY_EXT_ADD(msg, sa);
1707
1708 sa2 = (struct sadb_x_sa2*)PFKEY_EXT_ADD_NEXT(msg);
1709 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1710 sa2->sadb_x_sa2_len = PFKEY_LEN(sizeof(struct sadb_spirange));
1711 sa2->sadb_x_sa2_mode = mode2kernel(mode);
1712 sa2->sadb_x_sa2_reqid = reqid;
1713 PFKEY_EXT_ADD(msg, sa2);
1714
1715 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1716 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1717
1718 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
1719 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1720 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
1721 lft->sadb_lifetime_allocations = lifetime->packets.rekey;
1722 lft->sadb_lifetime_bytes = lifetime->bytes.rekey;
1723 lft->sadb_lifetime_addtime = lifetime->time.rekey;
1724 lft->sadb_lifetime_usetime = 0; /* we only use addtime */
1725 PFKEY_EXT_ADD(msg, lft);
1726
1727 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
1728 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1729 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
1730 lft->sadb_lifetime_allocations = lifetime->packets.life;
1731 lft->sadb_lifetime_bytes = lifetime->bytes.life;
1732 lft->sadb_lifetime_addtime = lifetime->time.life;
1733 lft->sadb_lifetime_usetime = 0; /* we only use addtime */
1734 PFKEY_EXT_ADD(msg, lft);
1735
1736 if (enc_alg != ENCR_UNDEFINED)
1737 {
1738 if (!sa->sadb_sa_encrypt)
1739 {
1740 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1741 encryption_algorithm_names, enc_alg);
1742 return FAILED;
1743 }
1744 DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
1745 encryption_algorithm_names, enc_alg, enc_key.len * 8);
1746
1747 key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
1748 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
1749 key->sadb_key_bits = enc_key.len * 8;
1750 key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + enc_key.len);
1751 memcpy(key + 1, enc_key.ptr, enc_key.len);
1752
1753 PFKEY_EXT_ADD(msg, key);
1754 }
1755
1756 if (int_alg != AUTH_UNDEFINED)
1757 {
1758 if (!sa->sadb_sa_auth)
1759 {
1760 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1761 integrity_algorithm_names, int_alg);
1762 return FAILED;
1763 }
1764 DBG2(DBG_KNL, " using integrity algorithm %N with key size %d",
1765 integrity_algorithm_names, int_alg, int_key.len * 8);
1766
1767 key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
1768 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
1769 key->sadb_key_bits = int_key.len * 8;
1770 key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + int_key.len);
1771 memcpy(key + 1, int_key.ptr, int_key.len);
1772
1773 PFKEY_EXT_ADD(msg, key);
1774 }
1775
1776 #ifdef HAVE_NATT
1777 if (encap)
1778 {
1779 add_encap_ext(msg, src, dst);
1780 }
1781 #endif /*HAVE_NATT*/
1782
1783 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1784 {
1785 DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi));
1786 return FAILED;
1787 }
1788 else if (out->sadb_msg_errno)
1789 {
1790 DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x: %s (%d)",
1791 ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno);
1792 free(out);
1793 return FAILED;
1794 }
1795
1796 free(out);
1797 return SUCCESS;
1798 }
1799
1800 METHOD(kernel_ipsec_t, update_sa, status_t,
1801 private_kernel_pfkey_ipsec_t *this, u_int32_t spi, u_int8_t protocol,
1802 u_int16_t cpi, host_t *src, host_t *dst, host_t *new_src, host_t *new_dst,
1803 bool encap, bool new_encap, mark_t mark)
1804 {
1805 unsigned char request[PFKEY_BUFFER_SIZE];
1806 struct sadb_msg *msg, *out;
1807 struct sadb_sa *sa;
1808 pfkey_msg_t response;
1809 size_t len;
1810
1811 /* we can't update the SA if any of the ip addresses have changed.
1812 * that's because we can't use SADB_UPDATE and by deleting and readding the
1813 * SA the sequence numbers would get lost */
1814 if (!src->ip_equals(src, new_src) ||
1815 !dst->ip_equals(dst, new_dst))
1816 {
1817 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: address "
1818 "changes are not supported", ntohl(spi));
1819 return NOT_SUPPORTED;
1820 }
1821
1822 /* if IPComp is used, we first update the IPComp SA */
1823 if (cpi)
1824 {
1825 update_sa(this, htonl(ntohs(cpi)), IPPROTO_COMP, 0,
1826 src, dst, new_src, new_dst, FALSE, FALSE, mark);
1827 }
1828
1829 memset(&request, 0, sizeof(request));
1830
1831 DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
1832
1833 msg = (struct sadb_msg*)request;
1834 msg->sadb_msg_version = PF_KEY_V2;
1835 msg->sadb_msg_type = SADB_GET;
1836 msg->sadb_msg_satype = proto2satype(protocol);
1837 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1838
1839 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1840 sa->sadb_sa_exttype = SADB_EXT_SA;
1841 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
1842 sa->sadb_sa_spi = spi;
1843 PFKEY_EXT_ADD(msg, sa);
1844
1845 /* the kernel wants a SADB_EXT_ADDRESS_SRC to be present even though
1846 * it is not used for anything. */
1847 add_anyaddr_ext(msg, dst->get_family(dst), SADB_EXT_ADDRESS_SRC);
1848 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1849
1850 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1851 {
1852 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1853 return FAILED;
1854 }
1855 else if (out->sadb_msg_errno)
1856 {
1857 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
1858 ntohl(spi), strerror(out->sadb_msg_errno),
1859 out->sadb_msg_errno);
1860 free(out);
1861 return FAILED;
1862 }
1863 else if (parse_pfkey_message(out, &response) != SUCCESS)
1864 {
1865 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: parsing "
1866 "response from kernel failed", ntohl(spi));
1867 free(out);
1868 return FAILED;
1869 }
1870
1871 DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H",
1872 ntohl(spi), src, dst, new_src, new_dst);
1873
1874 memset(&request, 0, sizeof(request));
1875
1876 msg = (struct sadb_msg*)request;
1877 msg->sadb_msg_version = PF_KEY_V2;
1878 msg->sadb_msg_type = SADB_UPDATE;
1879 msg->sadb_msg_satype = proto2satype(protocol);
1880 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1881
1882 #ifdef __APPLE__
1883 {
1884 struct sadb_sa_2 *sa_2;
1885 sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
1886 sa_2->sa.sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa_2));
1887 memcpy(&sa_2->sa, response.sa, sizeof(struct sadb_sa));
1888 if (encap)
1889 {
1890 sa_2->sadb_sa_natt_port = new_dst->get_port(new_dst);
1891 sa_2->sa.sadb_sa_flags |= SADB_X_EXT_NATT;
1892 }
1893 }
1894 #else
1895 PFKEY_EXT_COPY(msg, response.sa);
1896 #endif
1897 PFKEY_EXT_COPY(msg, response.x_sa2);
1898
1899 PFKEY_EXT_COPY(msg, response.src);
1900 PFKEY_EXT_COPY(msg, response.dst);
1901
1902 PFKEY_EXT_COPY(msg, response.lft_soft);
1903 PFKEY_EXT_COPY(msg, response.lft_hard);
1904
1905 if (response.key_encr)
1906 {
1907 PFKEY_EXT_COPY(msg, response.key_encr);
1908 }
1909
1910 if (response.key_auth)
1911 {
1912 PFKEY_EXT_COPY(msg, response.key_auth);
1913 }
1914
1915 #ifdef HAVE_NATT
1916 if (new_encap)
1917 {
1918 add_encap_ext(msg, new_src, new_dst);
1919 }
1920 #endif /*HAVE_NATT*/
1921
1922 free(out);
1923
1924 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1925 {
1926 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
1927 return FAILED;
1928 }
1929 else if (out->sadb_msg_errno)
1930 {
1931 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: %s (%d)",
1932 ntohl(spi), strerror(out->sadb_msg_errno),
1933 out->sadb_msg_errno);
1934 free(out);
1935 return FAILED;
1936 }
1937 free(out);
1938
1939 return SUCCESS;
1940 }
1941
1942 METHOD(kernel_ipsec_t, query_sa, status_t,
1943 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1944 u_int32_t spi, u_int8_t protocol, mark_t mark,
1945 u_int64_t *bytes, u_int64_t *packets, time_t *time)
1946 {
1947 unsigned char request[PFKEY_BUFFER_SIZE];
1948 struct sadb_msg *msg, *out;
1949 struct sadb_sa *sa;
1950 pfkey_msg_t response;
1951 size_t len;
1952
1953 memset(&request, 0, sizeof(request));
1954
1955 DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
1956
1957 msg = (struct sadb_msg*)request;
1958 msg->sadb_msg_version = PF_KEY_V2;
1959 msg->sadb_msg_type = SADB_GET;
1960 msg->sadb_msg_satype = proto2satype(protocol);
1961 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1962
1963 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1964 sa->sadb_sa_exttype = SADB_EXT_SA;
1965 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
1966 sa->sadb_sa_spi = spi;
1967 PFKEY_EXT_ADD(msg, sa);
1968
1969 /* the Linux Kernel doesn't care for the src address, but other systems do
1970 * (e.g. FreeBSD)
1971 */
1972 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1973 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1974
1975 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1976 {
1977 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1978 return FAILED;
1979 }
1980 else if (out->sadb_msg_errno)
1981 {
1982 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
1983 ntohl(spi), strerror(out->sadb_msg_errno),
1984 out->sadb_msg_errno);
1985 free(out);
1986 return FAILED;
1987 }
1988 else if (parse_pfkey_message(out, &response) != SUCCESS)
1989 {
1990 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1991 free(out);
1992 return FAILED;
1993 }
1994 if (bytes)
1995 {
1996 *bytes = response.lft_current->sadb_lifetime_bytes;
1997 }
1998 if (packets)
1999 {
2000 /* at least on Linux and FreeBSD this contains the number of packets */
2001 *packets = response.lft_current->sadb_lifetime_allocations;
2002 }
2003 if (time)
2004 {
2005 #ifdef __APPLE__
2006 /* OS X uses the "last" time of use in usetime */
2007 *time = response.lft_current->sadb_lifetime_usetime;
2008 #else /* !__APPLE__ */
2009 /* on Linux, sadb_lifetime_usetime is set to the "first" time of use,
2010 * which is actually correct according to PF_KEY. We have to query
2011 * policies for the last usetime. */
2012 *time = 0;
2013 #endif /* !__APPLE__ */
2014 }
2015
2016 free(out);
2017 return SUCCESS;
2018 }
2019
2020 METHOD(kernel_ipsec_t, del_sa, status_t,
2021 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
2022 u_int32_t spi, u_int8_t protocol, u_int16_t cpi, mark_t mark)
2023 {
2024 unsigned char request[PFKEY_BUFFER_SIZE];
2025 struct sadb_msg *msg, *out;
2026 struct sadb_sa *sa;
2027 size_t len;
2028
2029 /* if IPComp was used, we first delete the additional IPComp SA */
2030 if (cpi)
2031 {
2032 del_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, 0, mark);
2033 }
2034
2035 memset(&request, 0, sizeof(request));
2036
2037 DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(spi));
2038
2039 msg = (struct sadb_msg*)request;
2040 msg->sadb_msg_version = PF_KEY_V2;
2041 msg->sadb_msg_type = SADB_DELETE;
2042 msg->sadb_msg_satype = proto2satype(protocol);
2043 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2044
2045 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
2046 sa->sadb_sa_exttype = SADB_EXT_SA;
2047 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
2048 sa->sadb_sa_spi = spi;
2049 PFKEY_EXT_ADD(msg, sa);
2050
2051 /* the Linux Kernel doesn't care for the src address, but other systems do
2052 * (e.g. FreeBSD)
2053 */
2054 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
2055 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
2056
2057 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2058 {
2059 DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(spi));
2060 return FAILED;
2061 }
2062 else if (out->sadb_msg_errno)
2063 {
2064 DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x: %s (%d)",
2065 ntohl(spi), strerror(out->sadb_msg_errno),
2066 out->sadb_msg_errno);
2067 free(out);
2068 return FAILED;
2069 }
2070
2071 DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(spi));
2072 free(out);
2073 return SUCCESS;
2074 }
2075
2076 METHOD(kernel_ipsec_t, flush_sas, status_t,
2077 private_kernel_pfkey_ipsec_t *this)
2078 {
2079 unsigned char request[PFKEY_BUFFER_SIZE];
2080 struct sadb_msg *msg, *out;
2081 size_t len;
2082
2083 memset(&request, 0, sizeof(request));
2084
2085 DBG2(DBG_KNL, "flushing all SAD entries");
2086
2087 msg = (struct sadb_msg*)request;
2088 msg->sadb_msg_version = PF_KEY_V2;
2089 msg->sadb_msg_type = SADB_FLUSH;
2090 msg->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2091 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2092
2093 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2094 {
2095 DBG1(DBG_KNL, "unable to flush SAD entries");
2096 return FAILED;
2097 }
2098 else if (out->sadb_msg_errno)
2099 {
2100 DBG1(DBG_KNL, "unable to flush SAD entries: %s (%d)",
2101 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2102 free(out);
2103 return FAILED;
2104 }
2105 free(out);
2106 return SUCCESS;
2107 }
2108
2109 /**
2110 * Add an explicit exclude route to a routing entry
2111 */
2112 static void add_exclude_route(private_kernel_pfkey_ipsec_t *this,
2113 route_entry_t *route, host_t *src, host_t *dst)
2114 {
2115 enumerator_t *enumerator;
2116 exclude_route_t *exclude;
2117 host_t *gtw;
2118
2119 enumerator = this->excludes->create_enumerator(this->excludes);
2120 while (enumerator->enumerate(enumerator, &exclude))
2121 {
2122 if (dst->ip_equals(dst, exclude->dst))
2123 {
2124 route->exclude = exclude;
2125 exclude->refs++;
2126 }
2127 }
2128 enumerator->destroy(enumerator);
2129
2130 if (!route->exclude)
2131 {
2132 DBG2(DBG_KNL, "installing new exclude route for %H src %H", dst, src);
2133 gtw = hydra->kernel_interface->get_nexthop(hydra->kernel_interface,
2134 dst, -1, NULL);
2135 if (gtw)
2136 {
2137 char *if_name = NULL;
2138
2139 if (hydra->kernel_interface->get_interface(
2140 hydra->kernel_interface, src, &if_name) &&
2141 hydra->kernel_interface->add_route(hydra->kernel_interface,
2142 dst->get_address(dst),
2143 dst->get_family(dst) == AF_INET ? 32 : 128,
2144 gtw, src, if_name) == SUCCESS)
2145 {
2146 INIT(exclude,
2147 .dst = dst->clone(dst),
2148 .src = src->clone(src),
2149 .gtw = gtw->clone(gtw),
2150 .refs = 1,
2151 );
2152 route->exclude = exclude;
2153 this->excludes->insert_last(this->excludes, exclude);
2154 }
2155 else
2156 {
2157 DBG1(DBG_KNL, "installing exclude route for %H failed", dst);
2158 }
2159 gtw->destroy(gtw);
2160 free(if_name);
2161 }
2162 else
2163 {
2164 DBG1(DBG_KNL, "gateway lookup for for %H failed", dst);
2165 }
2166 }
2167 }
2168
2169 /**
2170 * Remove an exclude route attached to a routing entry
2171 */
2172 static void remove_exclude_route(private_kernel_pfkey_ipsec_t *this,
2173 route_entry_t *route)
2174 {
2175 if (route->exclude)
2176 {
2177 enumerator_t *enumerator;
2178 exclude_route_t *exclude;
2179 bool removed = FALSE;
2180 host_t *dst;
2181
2182 enumerator = this->excludes->create_enumerator(this->excludes);
2183 while (enumerator->enumerate(enumerator, &exclude))
2184 {
2185 if (route->exclude == exclude)
2186 {
2187 if (--exclude->refs == 0)
2188 {
2189 this->excludes->remove_at(this->excludes, enumerator);
2190 removed = TRUE;
2191 break;
2192 }
2193 }
2194 }
2195 enumerator->destroy(enumerator);
2196
2197 if (removed)
2198 {
2199 char *if_name = NULL;
2200
2201 dst = route->exclude->dst;
2202 DBG2(DBG_KNL, "uninstalling exclude route for %H src %H",
2203 dst, route->exclude->src);
2204 if (hydra->kernel_interface->get_interface(
2205 hydra->kernel_interface,
2206 route->exclude->src, &if_name) &&
2207 hydra->kernel_interface->del_route(hydra->kernel_interface,
2208 dst->get_address(dst),
2209 dst->get_family(dst) == AF_INET ? 32 : 128,
2210 route->exclude->gtw, route->exclude->src,
2211 if_name) != SUCCESS)
2212 {
2213 DBG1(DBG_KNL, "uninstalling exclude route for %H failed", dst);
2214 }
2215 exclude_route_destroy(route->exclude);
2216 free(if_name);
2217 }
2218 route->exclude = NULL;
2219 }
2220 }
2221
2222 /**
2223 * Try to install a route to the given inbound policy
2224 */
2225 static bool install_route(private_kernel_pfkey_ipsec_t *this,
2226 policy_entry_t *policy, policy_sa_in_t *in)
2227 {
2228 route_entry_t *route, *old;
2229 host_t *host, *src, *dst;
2230 bool is_virtual;
2231
2232 if (hydra->kernel_interface->get_address_by_ts(hydra->kernel_interface,
2233 in->dst_ts, &host, &is_virtual) != SUCCESS)
2234 {
2235 return FALSE;
2236 }
2237
2238 /* switch src/dst, as we handle an IN policy */
2239 src = in->generic.sa->dst;
2240 dst = in->generic.sa->src;
2241
2242 INIT(route,
2243 .prefixlen = policy->src.mask,
2244 .src_ip = host,
2245 .dst_net = chunk_clone(policy->src.net->get_address(policy->src.net)),
2246 );
2247
2248 if (!dst->is_anyaddr(dst))
2249 {
2250 route->gateway = hydra->kernel_interface->get_nexthop(
2251 hydra->kernel_interface, dst, -1, src);
2252
2253 /* if the IP is virtual, we install the route over the interface it has
2254 * been installed on. Otherwise we use the interface we use for IKE, as
2255 * this is required for example on Linux. */
2256 if (is_virtual)
2257 {
2258 src = route->src_ip;
2259 }
2260 }
2261 else
2262 { /* for shunt policies */
2263 route->gateway = hydra->kernel_interface->get_nexthop(
2264 hydra->kernel_interface, policy->src.net,
2265 policy->src.mask, route->src_ip);
2266
2267 /* we don't have a source address, use the address we found */
2268 src = route->src_ip;
2269 }
2270
2271 /* get interface for route, using source address */
2272 if (!hydra->kernel_interface->get_interface(hydra->kernel_interface,
2273 src, &route->if_name))
2274 {
2275 route_entry_destroy(route);
2276 return FALSE;
2277 }
2278
2279 if (policy->route)
2280 {
2281 old = policy->route;
2282
2283 if (route_entry_equals(old, route))
2284 { /* such a route already exists */
2285 route_entry_destroy(route);
2286 return TRUE;
2287 }
2288 /* uninstall previously installed route */
2289 if (hydra->kernel_interface->del_route(hydra->kernel_interface,
2290 old->dst_net, old->prefixlen, old->gateway,
2291 old->src_ip, old->if_name) != SUCCESS)
2292 {
2293 DBG1(DBG_KNL, "error uninstalling route installed with policy "
2294 "%R === %R %N", in->src_ts, in->dst_ts,
2295 policy_dir_names, policy->direction);
2296 }
2297 route_entry_destroy(old);
2298 policy->route = NULL;
2299 }
2300
2301 /* if remote traffic selector covers the IKE peer, add an exclude route */
2302 if (hydra->kernel_interface->get_features(
2303 hydra->kernel_interface) & KERNEL_REQUIRE_EXCLUDE_ROUTE)
2304 {
2305 if (in->src_ts->is_host(in->src_ts, dst))
2306 {
2307 DBG1(DBG_KNL, "can't install route for %R === %R %N, conflicts "
2308 "with IKE traffic", in->src_ts, in->dst_ts, policy_dir_names,
2309 policy->direction);
2310 route_entry_destroy(route);
2311 return FALSE;
2312 }
2313 if (in->src_ts->includes(in->src_ts, dst))
2314 {
2315 add_exclude_route(this, route, in->generic.sa->dst, dst);
2316 }
2317 }
2318
2319 DBG2(DBG_KNL, "installing route: %R via %H src %H dev %s",
2320 in->src_ts, route->gateway, route->src_ip, route->if_name);
2321
2322 switch (hydra->kernel_interface->add_route(hydra->kernel_interface,
2323 route->dst_net, route->prefixlen, route->gateway,
2324 route->src_ip, route->if_name))
2325 {
2326 case ALREADY_DONE:
2327 /* route exists, do not uninstall */
2328 remove_exclude_route(this, route);
2329 route_entry_destroy(route);
2330 return TRUE;
2331 case SUCCESS:
2332 /* cache the installed route */
2333 policy->route = route;
2334 return TRUE;
2335 default:
2336 DBG1(DBG_KNL, "installing route failed: %R via %H src %H dev %s",
2337 in->src_ts, route->gateway, route->src_ip, route->if_name);
2338 remove_exclude_route(this, route);
2339 route_entry_destroy(route);
2340 return FALSE;
2341 }
2342 }
2343
2344 /**
2345 * Add or update a policy in the kernel.
2346 *
2347 * Note: The mutex has to be locked when entering this function.
2348 */
2349 static status_t add_policy_internal(private_kernel_pfkey_ipsec_t *this,
2350 policy_entry_t *policy, policy_sa_t *mapping, bool update)
2351 {
2352 unsigned char request[PFKEY_BUFFER_SIZE];
2353 struct sadb_msg *msg, *out;
2354 struct sadb_x_policy *pol;
2355 struct sadb_x_ipsecrequest *req;
2356 ipsec_sa_t *ipsec = mapping->sa;
2357 pfkey_msg_t response;
2358 size_t len;
2359 ipsec_mode_t proto_mode;
2360
2361 memset(&request, 0, sizeof(request));
2362
2363 msg = (struct sadb_msg*)request;
2364 msg->sadb_msg_version = PF_KEY_V2;
2365 msg->sadb_msg_type = update ? SADB_X_SPDUPDATE : SADB_X_SPDADD;
2366 msg->sadb_msg_satype = 0;
2367 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2368
2369 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2370 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2371 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2372 pol->sadb_x_policy_id = 0;
2373 pol->sadb_x_policy_dir = dir2kernel(policy->direction);
2374 pol->sadb_x_policy_type = type2kernel(mapping->type);
2375 #ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY
2376 pol->sadb_x_policy_priority = mapping->priority;
2377 #endif
2378
2379 /* one or more sadb_x_ipsecrequest extensions are added to the
2380 * sadb_x_policy extension */
2381 proto_mode = ipsec->cfg.mode;
2382
2383 req = (struct sadb_x_ipsecrequest*)(pol + 1);
2384
2385 if (ipsec->cfg.ipcomp.transform != IPCOMP_NONE)
2386 {
2387 req->sadb_x_ipsecrequest_proto = IPPROTO_COMP;
2388
2389 /* !!! the length here MUST be in octets instead of 64 bit words */
2390 req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2391 req->sadb_x_ipsecrequest_mode = mode2kernel(ipsec->cfg.mode);
2392 req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2393 req->sadb_x_ipsecrequest_level = (policy->direction == POLICY_OUT) ?
2394 IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_USE;
2395 if (ipsec->cfg.mode == MODE_TUNNEL)
2396 {
2397 len = hostcpy(req + 1, ipsec->src, FALSE);
2398 req->sadb_x_ipsecrequest_len += len;
2399 len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2400 req->sadb_x_ipsecrequest_len += len;
2401 /* use transport mode for other SAs */
2402 proto_mode = MODE_TRANSPORT;
2403 }
2404
2405 pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2406 req = (struct sadb_x_ipsecrequest*)((char*)(req) +
2407 req->sadb_x_ipsecrequest_len);
2408 }
2409
2410 req->sadb_x_ipsecrequest_proto = ipsec->cfg.esp.use ? IPPROTO_ESP
2411 : IPPROTO_AH;
2412 /* !!! the length here MUST be in octets instead of 64 bit words */
2413 req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2414 req->sadb_x_ipsecrequest_mode = mode2kernel(proto_mode);
2415 req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2416 req->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2417 if (proto_mode == MODE_TUNNEL)
2418 {
2419 len = hostcpy(req + 1, ipsec->src, FALSE);
2420 req->sadb_x_ipsecrequest_len += len;
2421 len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2422 req->sadb_x_ipsecrequest_len += len;
2423 }
2424
2425 pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2426 PFKEY_EXT_ADD(msg, pol);
2427
2428 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2429 policy->src.mask, TRUE);
2430 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2431 policy->dst.mask, TRUE);
2432
2433 #ifdef __FreeBSD__
2434 { /* on FreeBSD a lifetime has to be defined to be able to later query
2435 * the current use time. */
2436 struct sadb_lifetime *lft;
2437 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
2438 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2439 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
2440 lft->sadb_lifetime_addtime = LONG_MAX;
2441 PFKEY_EXT_ADD(msg, lft);
2442 }
2443 #endif
2444
2445 this->mutex->unlock(this->mutex);
2446
2447 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2448 {
2449 return FAILED;
2450 }
2451 else if (out->sadb_msg_errno)
2452 {
2453 DBG1(DBG_KNL, "unable to %s policy: %s (%d)",
2454 update ? "update" : "add", strerror(out->sadb_msg_errno),
2455 out->sadb_msg_errno);
2456 free(out);
2457 return FAILED;
2458 }
2459 else if (parse_pfkey_message(out, &response) != SUCCESS)
2460 {
2461 DBG1(DBG_KNL, "unable to %s policy: parsing response from kernel "
2462 "failed", update ? "update" : "add");
2463 free(out);
2464 return FAILED;
2465 }
2466
2467 /* we try to find the policy again and update the kernel index */
2468 this->mutex->lock(this->mutex);
2469 if (this->policies->find_first(this->policies, NULL,
2470 (void**)&policy) != SUCCESS)
2471 {
2472 DBG2(DBG_KNL, "unable to update index, the policy is already gone, "
2473 "ignoring");
2474 this->mutex->unlock(this->mutex);
2475 free(out);
2476 return SUCCESS;
2477 }
2478 policy->index = response.x_policy->sadb_x_policy_id;
2479 free(out);
2480
2481 /* install a route, if:
2482 * - this is an inbound policy (to just get one for each child)
2483 * - we are in tunnel mode or install a bypass policy
2484 * - routing is not disabled via strongswan.conf
2485 */
2486 if (policy->direction == POLICY_IN && this->install_routes &&
2487 (mapping->type != POLICY_IPSEC || ipsec->cfg.mode != MODE_TRANSPORT))
2488 {
2489 install_route(this, policy, (policy_sa_in_t*)mapping);
2490 }
2491 this->mutex->unlock(this->mutex);
2492 return SUCCESS;
2493 }
2494
2495 METHOD(kernel_ipsec_t, add_policy, status_t,
2496 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
2497 traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
2498 policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa,
2499 mark_t mark, policy_priority_t priority)
2500 {
2501 policy_entry_t *policy, *found = NULL;
2502 policy_sa_t *assigned_sa, *current_sa;
2503 enumerator_t *enumerator;
2504 bool update = TRUE;
2505
2506 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2507 { /* FWD policies are not supported on all platforms */
2508 return SUCCESS;
2509 }
2510
2511 /* create a policy */
2512 policy = create_policy_entry(src_ts, dst_ts, direction);
2513
2514 /* find a matching policy */
2515 this->mutex->lock(this->mutex);
2516 if (this->policies->find_first(this->policies,
2517 (linked_list_match_t)policy_entry_equals,
2518 (void**)&found, policy) == SUCCESS)
2519 { /* use existing policy */
2520 DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing "
2521 "refcount", src_ts, dst_ts, policy_dir_names, direction);
2522 policy_entry_destroy(policy, this);
2523 policy = found;
2524 }
2525 else
2526 { /* use the new one, if we have no such policy */
2527 this->policies->insert_first(this->policies, policy);
2528 policy->used_by = linked_list_create();
2529 }
2530
2531 /* cache the assigned IPsec SA */
2532 assigned_sa = policy_sa_create(this, direction, type, src, dst, src_ts,
2533 dst_ts, sa);
2534 assigned_sa->priority = get_priority(policy, priority);
2535
2536 /* insert the SA according to its priority */
2537 enumerator = policy->used_by->create_enumerator(policy->used_by);
2538 while (enumerator->enumerate(enumerator, (void**)&current_sa))
2539 {
2540 if (current_sa->priority >= assigned_sa->priority)
2541 {
2542 break;
2543 }
2544 update = FALSE;
2545 }
2546 policy->used_by->insert_before(policy->used_by, enumerator, assigned_sa);
2547 enumerator->destroy(enumerator);
2548
2549 if (!update)
2550 { /* we don't update the policy if the priority is lower than that of the
2551 * currently installed one */
2552 this->mutex->unlock(this->mutex);
2553 return SUCCESS;
2554 }
2555
2556 DBG2(DBG_KNL, "%s policy %R === %R %N",
2557 found ? "updating" : "adding", src_ts, dst_ts,
2558 policy_dir_names, direction);
2559
2560 if (add_policy_internal(this, policy, assigned_sa, found) != SUCCESS)
2561 {
2562 DBG1(DBG_KNL, "unable to %s policy %R === %R %N",
2563 found ? "update" : "add", src_ts, dst_ts,
2564 policy_dir_names, direction);
2565 return FAILED;
2566 }
2567 return SUCCESS;
2568 }
2569
2570 METHOD(kernel_ipsec_t, query_policy, status_t,
2571 private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts,
2572 traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
2573 time_t *use_time)
2574 {
2575 unsigned char request[PFKEY_BUFFER_SIZE];
2576 struct sadb_msg *msg, *out;
2577 struct sadb_x_policy *pol;
2578 policy_entry_t *policy, *found = NULL;
2579 pfkey_msg_t response;
2580 size_t len;
2581
2582 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2583 { /* FWD policies are not supported on all platforms */
2584 return NOT_FOUND;
2585 }
2586
2587 DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts,
2588 policy_dir_names, direction);
2589
2590 /* create a policy */
2591 policy = create_policy_entry(src_ts, dst_ts, direction);
2592
2593 /* find a matching policy */
2594 this->mutex->lock(this->mutex);
2595 if (this->policies->find_first(this->policies,
2596 (linked_list_match_t)policy_entry_equals,
2597 (void**)&found, policy) != SUCCESS)
2598 {
2599 DBG1(DBG_KNL, "querying policy %R === %R %N failed, not found", src_ts,
2600 dst_ts, policy_dir_names, direction);
2601 policy_entry_destroy(policy, this);
2602 this->mutex->unlock(this->mutex);
2603 return NOT_FOUND;
2604 }
2605 policy_entry_destroy(policy, this);
2606 policy = found;
2607
2608 memset(&request, 0, sizeof(request));
2609
2610 msg = (struct sadb_msg*)request;
2611 msg->sadb_msg_version = PF_KEY_V2;
2612 msg->sadb_msg_type = SADB_X_SPDGET;
2613 msg->sadb_msg_satype = 0;
2614 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2615
2616 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2617 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2618 pol->sadb_x_policy_id = policy->index;
2619 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2620 pol->sadb_x_policy_dir = dir2kernel(direction);
2621 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2622 PFKEY_EXT_ADD(msg, pol);
2623
2624 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2625 policy->src.mask, TRUE);
2626 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2627 policy->dst.mask, TRUE);
2628
2629 this->mutex->unlock(this->mutex);
2630
2631 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2632 {
2633 DBG1(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts,
2634 policy_dir_names, direction);
2635 return FAILED;
2636 }
2637 else if (out->sadb_msg_errno)
2638 {
2639 DBG1(DBG_KNL, "unable to query policy %R === %R %N: %s (%d)", src_ts,
2640 dst_ts, policy_dir_names, direction,
2641 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2642 free(out);
2643 return FAILED;
2644 }
2645 else if (parse_pfkey_message(out, &response) != SUCCESS)
2646 {
2647 DBG1(DBG_KNL, "unable to query policy %R === %R %N: parsing response "
2648 "from kernel failed", src_ts, dst_ts, policy_dir_names,
2649 direction);
2650 free(out);
2651 return FAILED;
2652 }
2653 else if (response.lft_current == NULL)
2654 {
2655 DBG2(DBG_KNL, "unable to query policy %R === %R %N: kernel reports no "
2656 "use time", src_ts, dst_ts, policy_dir_names, direction);
2657 free(out);
2658 return FAILED;
2659 }
2660
2661 /* we need the monotonic time, but the kernel returns system time. */
2662 if (response.lft_current->sadb_lifetime_usetime)
2663 {
2664 *use_time = time_monotonic(NULL) -
2665 (time(NULL) - response.lft_current->sadb_lifetime_usetime);
2666 }
2667 else
2668 {
2669 *use_time = 0;
2670 }
2671 free(out);
2672 return SUCCESS;
2673 }
2674
2675 METHOD(kernel_ipsec_t, del_policy, status_t,
2676 private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts,
2677 traffic_selector_t *dst_ts, policy_dir_t direction, u_int32_t reqid,
2678 mark_t mark, policy_priority_t prio)
2679 {
2680 unsigned char request[PFKEY_BUFFER_SIZE];
2681 struct sadb_msg *msg, *out;
2682 struct sadb_x_policy *pol;
2683 policy_entry_t *policy, *found = NULL;
2684 policy_sa_t *mapping, *to_remove = NULL;
2685 enumerator_t *enumerator;
2686 bool first = TRUE, is_installed = TRUE;
2687 u_int32_t priority;
2688 size_t len;
2689
2690 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2691 { /* FWD policies are not supported on all platforms */
2692 return SUCCESS;
2693 }
2694
2695 DBG2(DBG_KNL, "deleting policy %R === %R %N", src_ts, dst_ts,
2696 policy_dir_names, direction);
2697
2698 /* create a policy */
2699 policy = create_policy_entry(src_ts, dst_ts, direction);
2700
2701 /* find a matching policy */
2702 this->mutex->lock(this->mutex);
2703 if (this->policies->find_first(this->policies,
2704 (linked_list_match_t)policy_entry_equals,
2705 (void**)&found, policy) != SUCCESS)
2706 {
2707 DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", src_ts,
2708 dst_ts, policy_dir_names, direction);
2709 policy_entry_destroy(policy, this);
2710 this->mutex->unlock(this->mutex);
2711 return NOT_FOUND;
2712 }
2713 policy_entry_destroy(policy, this);
2714 policy = found;
2715
2716 /* remove mapping to SA by reqid and priority, if multiple match, which
2717 * could happen when rekeying due to an address change, remove the oldest */
2718 priority = get_priority(policy, prio);
2719 enumerator = policy->used_by->create_enumerator(policy->used_by);
2720 while (enumerator->enumerate(enumerator, (void**)&mapping))
2721 {
2722 if (reqid == mapping->sa->cfg.reqid && priority == mapping->priority)
2723 {
2724 to_remove = mapping;
2725 is_installed = first;
2726 }
2727 else if (priority < mapping->priority)
2728 {
2729 break;
2730 }
2731 first = FALSE;
2732 }
2733 enumerator->destroy(enumerator);
2734 if (!to_remove)
2735 { /* sanity check */
2736 this->mutex->unlock(this->mutex);
2737 return SUCCESS;
2738 }
2739 policy->used_by->remove(policy->used_by, to_remove, NULL);
2740 mapping = to_remove;
2741
2742 if (policy->used_by->get_count(policy->used_by) > 0)
2743 { /* policy is used by more SAs, keep in kernel */
2744 DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
2745 policy_sa_destroy(mapping, &direction, this);
2746
2747 if (!is_installed)
2748 { /* no need to update as the policy was not installed for this SA */
2749 this->mutex->unlock(this->mutex);
2750 return SUCCESS;
2751 }
2752
2753 DBG2(DBG_KNL, "updating policy %R === %R %N", src_ts, dst_ts,
2754 policy_dir_names, direction);
2755 policy->used_by->get_first(policy->used_by, (void**)&mapping);
2756 if (add_policy_internal(this, policy, mapping, TRUE) != SUCCESS)
2757 {
2758 DBG1(DBG_KNL, "unable to update policy %R === %R %N",
2759 src_ts, dst_ts, policy_dir_names, direction);
2760 return FAILED;
2761 }
2762 return SUCCESS;
2763 }
2764
2765 memset(&request, 0, sizeof(request));
2766
2767 msg = (struct sadb_msg*)request;
2768 msg->sadb_msg_version = PF_KEY_V2;
2769 msg->sadb_msg_type = SADB_X_SPDDELETE;
2770 msg->sadb_msg_satype = 0;
2771 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2772
2773 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2774 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2775 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2776 pol->sadb_x_policy_dir = dir2kernel(direction);
2777 pol->sadb_x_policy_type = type2kernel(mapping->type);
2778 PFKEY_EXT_ADD(msg, pol);
2779
2780 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2781 policy->src.mask, TRUE);
2782 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2783 policy->dst.mask, TRUE);
2784
2785 if (policy->route)
2786 {
2787 route_entry_t *route = policy->route;
2788 if (hydra->kernel_interface->del_route(hydra->kernel_interface,
2789 route->dst_net, route->prefixlen, route->gateway,
2790 route->src_ip, route->if_name) != SUCCESS)
2791 {
2792 DBG1(DBG_KNL, "error uninstalling route installed with "
2793 "policy %R === %R %N", src_ts, dst_ts,
2794 policy_dir_names, direction);
2795 }
2796 remove_exclude_route(this, route);
2797 }
2798
2799 this->policies->remove(this->policies, found, NULL);
2800 policy_sa_destroy(mapping, &direction, this);
2801 policy_entry_destroy(policy, this);
2802 this->mutex->unlock(this->mutex);
2803
2804 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2805 {
2806 DBG1(DBG_KNL, "unable to delete policy %R === %R %N", src_ts, dst_ts,
2807 policy_dir_names, direction);
2808 return FAILED;
2809 }
2810 else if (out->sadb_msg_errno)
2811 {
2812 DBG1(DBG_KNL, "unable to delete policy %R === %R %N: %s (%d)", src_ts,
2813 dst_ts, policy_dir_names, direction,
2814 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2815 free(out);
2816 return FAILED;
2817 }
2818 free(out);
2819 return SUCCESS;
2820 }
2821
2822 METHOD(kernel_ipsec_t, flush_policies, status_t,
2823 private_kernel_pfkey_ipsec_t *this)
2824 {
2825 unsigned char request[PFKEY_BUFFER_SIZE];
2826 struct sadb_msg *msg, *out;
2827 size_t len;
2828
2829 memset(&request, 0, sizeof(request));
2830
2831 DBG2(DBG_KNL, "flushing all policies from SPD");
2832
2833 msg = (struct sadb_msg*)request;
2834 msg->sadb_msg_version = PF_KEY_V2;
2835 msg->sadb_msg_type = SADB_X_SPDFLUSH;
2836 msg->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2837 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2838
2839 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2840 {
2841 DBG1(DBG_KNL, "unable to flush SPD entries");
2842 return FAILED;
2843 }
2844 else if (out->sadb_msg_errno)
2845 {
2846 DBG1(DBG_KNL, "unable to flush SPD entries: %s (%d)",
2847 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2848 free(out);
2849 return FAILED;
2850 }
2851 free(out);
2852 return SUCCESS;
2853 }
2854
2855 /**
2856 * Register a socket for ACQUIRE/EXPIRE messages
2857 */
2858 static status_t register_pfkey_socket(private_kernel_pfkey_ipsec_t *this,
2859 u_int8_t satype)
2860 {
2861 unsigned char request[PFKEY_BUFFER_SIZE];
2862 struct sadb_msg *msg, *out;
2863 size_t len;
2864
2865 memset(&request, 0, sizeof(request));
2866
2867 msg = (struct sadb_msg*)request;
2868 msg->sadb_msg_version = PF_KEY_V2;
2869 msg->sadb_msg_type = SADB_REGISTER;
2870 msg->sadb_msg_satype = satype;
2871 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2872
2873 if (pfkey_send_socket(this, this->socket_events, msg, &out, &len) != SUCCESS)
2874 {
2875 DBG1(DBG_KNL, "unable to register PF_KEY socket");
2876 return FAILED;
2877 }
2878 else if (out->sadb_msg_errno)
2879 {
2880 DBG1(DBG_KNL, "unable to register PF_KEY socket: %s (%d)",
2881 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2882 free(out);
2883 return FAILED;
2884 }
2885 free(out);
2886 return SUCCESS;
2887 }
2888
2889 METHOD(kernel_ipsec_t, bypass_socket, bool,
2890 private_kernel_pfkey_ipsec_t *this, int fd, int family)
2891 {
2892 struct sadb_x_policy policy;
2893 u_int sol, ipsec_policy;
2894
2895 switch (family)
2896 {
2897 case AF_INET:
2898 {
2899 sol = SOL_IP;
2900 ipsec_policy = IP_IPSEC_POLICY;
2901 break;
2902 }
2903 case AF_INET6:
2904 {
2905 sol = SOL_IPV6;
2906 ipsec_policy = IPV6_IPSEC_POLICY;
2907 break;
2908 }
2909 default:
2910 return FALSE;
2911 }
2912
2913 memset(&policy, 0, sizeof(policy));
2914 policy.sadb_x_policy_len = sizeof(policy) / sizeof(u_int64_t);