libhydra: Move kernel interface to libcharon
[strongswan.git] / src / libcharon / plugins / kernel_pfkey / kernel_pfkey_ipsec.c
1 /*
2 * Copyright (C) 2008-2015 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 <daemon.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 #if !defined(SADB_X_EALG_AES_GCM_ICV8) && defined(SADB_X_EALG_AESGCM8)
110 #define SADB_X_EALG_AES_GCM_ICV8 SADB_X_EALG_AESGCM8
111 #define SADB_X_EALG_AES_GCM_ICV12 SADB_X_EALG_AESGCM12
112 #define SADB_X_EALG_AES_GCM_ICV16 SADB_X_EALG_AESGCM16
113 #endif
114
115 #ifndef SOL_IP
116 #define SOL_IP IPPROTO_IP
117 #define SOL_IPV6 IPPROTO_IPV6
118 #endif
119
120 /** from linux/in.h */
121 #ifndef IP_IPSEC_POLICY
122 #define IP_IPSEC_POLICY 16
123 #endif
124
125 /** missing on uclibc */
126 #ifndef IPV6_IPSEC_POLICY
127 #define IPV6_IPSEC_POLICY 34
128 #endif
129
130 /* from linux/udp.h */
131 #ifndef UDP_ENCAP
132 #define UDP_ENCAP 100
133 #endif
134
135 #ifndef UDP_ENCAP_ESPINUDP
136 #define UDP_ENCAP_ESPINUDP 2
137 #endif
138
139 /* this is not defined on some platforms */
140 #ifndef SOL_UDP
141 #define SOL_UDP IPPROTO_UDP
142 #endif
143
144 /** base priority for installed policies */
145 #define PRIO_BASE 384
146
147 #ifdef __APPLE__
148 /** from xnu/bsd/net/pfkeyv2.h */
149 #define SADB_X_EXT_NATT 0x002
150 struct sadb_sa_2 {
151 struct sadb_sa sa;
152 u_int16_t sadb_sa_natt_port;
153 u_int16_t sadb_reserved0;
154 u_int32_t sadb_reserved1;
155 };
156 #endif
157
158 /** buffer size for PF_KEY messages */
159 #define PFKEY_BUFFER_SIZE 4096
160
161 /** PF_KEY messages are 64 bit aligned */
162 #define PFKEY_ALIGNMENT 8
163 /** aligns len to 64 bits */
164 #define PFKEY_ALIGN(len) (((len) + PFKEY_ALIGNMENT - 1) & ~(PFKEY_ALIGNMENT - 1))
165 /** calculates the properly padded length in 64 bit chunks */
166 #define PFKEY_LEN(len) ((PFKEY_ALIGN(len) / PFKEY_ALIGNMENT))
167 /** calculates user mode length i.e. in bytes */
168 #define PFKEY_USER_LEN(len) ((len) * PFKEY_ALIGNMENT)
169
170 /** given a PF_KEY message header and an extension this updates the length in the header */
171 #define PFKEY_EXT_ADD(msg, ext) ((msg)->sadb_msg_len += ((struct sadb_ext*)ext)->sadb_ext_len)
172 /** given a PF_KEY message header this returns a pointer to the next extension */
173 #define PFKEY_EXT_ADD_NEXT(msg) ((struct sadb_ext*)(((char*)(msg)) + PFKEY_USER_LEN((msg)->sadb_msg_len)))
174 /** copy an extension and append it to a PF_KEY message */
175 #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))))
176 /** given a PF_KEY extension this returns a pointer to the next extension */
177 #define PFKEY_EXT_NEXT(ext) ((struct sadb_ext*)(((char*)(ext)) + PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len)))
178 /** given a PF_KEY extension this returns a pointer to the next extension also updates len (len in 64 bit words) */
179 #define PFKEY_EXT_NEXT_LEN(ext,len) ((len) -= (ext)->sadb_ext_len, PFKEY_EXT_NEXT(ext))
180 /** true if ext has a valid length and len is large enough to contain ext (assuming len in 64 bit words) */
181 #define PFKEY_EXT_OK(ext,len) ((len) >= PFKEY_LEN(sizeof(struct sadb_ext)) && \
182 (ext)->sadb_ext_len >= PFKEY_LEN(sizeof(struct sadb_ext)) && \
183 (ext)->sadb_ext_len <= (len))
184
185 typedef struct private_kernel_pfkey_ipsec_t private_kernel_pfkey_ipsec_t;
186
187 /**
188 * Private variables and functions of kernel_pfkey class.
189 */
190 struct private_kernel_pfkey_ipsec_t
191 {
192 /**
193 * Public part of the kernel_pfkey_t object.
194 */
195 kernel_pfkey_ipsec_t public;
196
197 /**
198 * mutex to lock access to various lists
199 */
200 mutex_t *mutex;
201
202 /**
203 * List of installed policies (policy_entry_t)
204 */
205 linked_list_t *policies;
206
207 /**
208 * List of exclude routes (exclude_route_t)
209 */
210 linked_list_t *excludes;
211
212 /**
213 * Hash table of IPsec SAs using policies (ipsec_sa_t)
214 */
215 hashtable_t *sas;
216
217 /**
218 * whether to install routes along policies
219 */
220 bool install_routes;
221
222 /**
223 * mutex to lock access to the PF_KEY socket
224 */
225 mutex_t *mutex_pfkey;
226
227 /**
228 * PF_KEY socket to communicate with the kernel
229 */
230 int socket;
231
232 /**
233 * PF_KEY socket to receive acquire and expire events
234 */
235 int socket_events;
236
237 /**
238 * sequence number for messages sent to the kernel
239 */
240 int seq;
241 };
242
243 typedef struct exclude_route_t exclude_route_t;
244
245 /**
246 * Exclude route definition
247 */
248 struct exclude_route_t {
249 /** destination address of exclude */
250 host_t *dst;
251 /** source address for route */
252 host_t *src;
253 /** nexthop exclude has been installed */
254 host_t *gtw;
255 /** references to this route */
256 int refs;
257 };
258
259 /**
260 * clean up a route exclude entry
261 */
262 static void exclude_route_destroy(exclude_route_t *this)
263 {
264 this->dst->destroy(this->dst);
265 this->src->destroy(this->src);
266 this->gtw->destroy(this->gtw);
267 free(this);
268 }
269
270 typedef struct route_entry_t route_entry_t;
271
272 /**
273 * installed routing entry
274 */
275 struct route_entry_t {
276 /** name of the interface the route is bound to */
277 char *if_name;
278
279 /** source ip of the route */
280 host_t *src_ip;
281
282 /** gateway for this route */
283 host_t *gateway;
284
285 /** destination net */
286 chunk_t dst_net;
287
288 /** destination net prefixlen */
289 u_int8_t prefixlen;
290
291 /** reference to exclude route, if any */
292 exclude_route_t *exclude;
293 };
294
295 /**
296 * destroy an route_entry_t object
297 */
298 static void route_entry_destroy(route_entry_t *this)
299 {
300 free(this->if_name);
301 DESTROY_IF(this->src_ip);
302 DESTROY_IF(this->gateway);
303 chunk_free(&this->dst_net);
304 free(this);
305 }
306
307 /**
308 * compare two route_entry_t objects
309 */
310 static bool route_entry_equals(route_entry_t *a, route_entry_t *b)
311 {
312 return a->if_name && b->if_name && streq(a->if_name, b->if_name) &&
313 a->src_ip->ip_equals(a->src_ip, b->src_ip) &&
314 a->gateway && b->gateway &&
315 a->gateway->ip_equals(a->gateway, b->gateway) &&
316 chunk_equals(a->dst_net, b->dst_net) && a->prefixlen == b->prefixlen;
317 }
318
319 typedef struct ipsec_sa_t ipsec_sa_t;
320
321 /**
322 * IPsec SA assigned to a policy.
323 */
324 struct ipsec_sa_t {
325 /** Source address of this SA */
326 host_t *src;
327
328 /** Destination address of this SA */
329 host_t *dst;
330
331 /** Description of this SA */
332 ipsec_sa_cfg_t cfg;
333
334 /** Reference count for this SA */
335 refcount_t refcount;
336 };
337
338 /**
339 * Hash function for ipsec_sa_t objects
340 */
341 static u_int ipsec_sa_hash(ipsec_sa_t *sa)
342 {
343 return chunk_hash_inc(sa->src->get_address(sa->src),
344 chunk_hash_inc(sa->dst->get_address(sa->dst),
345 chunk_hash(chunk_from_thing(sa->cfg))));
346 }
347
348 /**
349 * Equality function for ipsec_sa_t objects
350 */
351 static bool ipsec_sa_equals(ipsec_sa_t *sa, ipsec_sa_t *other_sa)
352 {
353 return sa->src->ip_equals(sa->src, other_sa->src) &&
354 sa->dst->ip_equals(sa->dst, other_sa->dst) &&
355 memeq(&sa->cfg, &other_sa->cfg, sizeof(ipsec_sa_cfg_t));
356 }
357
358 /**
359 * Allocate or reference an IPsec SA object
360 */
361 static ipsec_sa_t *ipsec_sa_create(private_kernel_pfkey_ipsec_t *this,
362 host_t *src, host_t *dst,
363 ipsec_sa_cfg_t *cfg)
364 {
365 ipsec_sa_t *sa, *found;
366 INIT(sa,
367 .src = src,
368 .dst = dst,
369 .cfg = *cfg,
370 );
371 found = this->sas->get(this->sas, sa);
372 if (!found)
373 {
374 sa->src = src->clone(src);
375 sa->dst = dst->clone(dst);
376 this->sas->put(this->sas, sa, sa);
377 }
378 else
379 {
380 free(sa);
381 sa = found;
382 }
383 ref_get(&sa->refcount);
384 return sa;
385 }
386
387 /**
388 * Release and destroy an IPsec SA object
389 */
390 static void ipsec_sa_destroy(private_kernel_pfkey_ipsec_t *this,
391 ipsec_sa_t *sa)
392 {
393 if (ref_put(&sa->refcount))
394 {
395 this->sas->remove(this->sas, sa);
396 DESTROY_IF(sa->src);
397 DESTROY_IF(sa->dst);
398 free(sa);
399 }
400 }
401
402 typedef struct policy_sa_t policy_sa_t;
403 typedef struct policy_sa_in_t policy_sa_in_t;
404
405 /**
406 * Mapping between a policy and an IPsec SA.
407 */
408 struct policy_sa_t {
409 /** Priority assigned to the policy when installed with this SA */
410 u_int32_t priority;
411
412 /** Type of the policy */
413 policy_type_t type;
414
415 /** Assigned SA */
416 ipsec_sa_t *sa;
417 };
418
419 /**
420 * For input policies we also cache the traffic selectors in order to install
421 * the route.
422 */
423 struct policy_sa_in_t {
424 /** Generic interface */
425 policy_sa_t generic;
426
427 /** Source traffic selector of this policy */
428 traffic_selector_t *src_ts;
429
430 /** Destination traffic selector of this policy */
431 traffic_selector_t *dst_ts;
432 };
433
434 /**
435 * Create a policy_sa(_in)_t object
436 */
437 static policy_sa_t *policy_sa_create(private_kernel_pfkey_ipsec_t *this,
438 policy_dir_t dir, policy_type_t type, host_t *src, host_t *dst,
439 traffic_selector_t *src_ts, traffic_selector_t *dst_ts, ipsec_sa_cfg_t *cfg)
440 {
441 policy_sa_t *policy;
442
443 if (dir == POLICY_IN)
444 {
445 policy_sa_in_t *in;
446 INIT(in,
447 .src_ts = src_ts->clone(src_ts),
448 .dst_ts = dst_ts->clone(dst_ts),
449 );
450 policy = &in->generic;
451 }
452 else
453 {
454 INIT(policy, .priority = 0);
455 }
456 policy->type = type;
457 policy->sa = ipsec_sa_create(this, src, dst, cfg);
458 return policy;
459 }
460
461 /**
462 * Destroy a policy_sa(_in)_t object
463 */
464 static void policy_sa_destroy(policy_sa_t *policy, policy_dir_t *dir,
465 private_kernel_pfkey_ipsec_t *this)
466 {
467 if (*dir == POLICY_IN)
468 {
469 policy_sa_in_t *in = (policy_sa_in_t*)policy;
470 in->src_ts->destroy(in->src_ts);
471 in->dst_ts->destroy(in->dst_ts);
472 }
473 ipsec_sa_destroy(this, policy->sa);
474 free(policy);
475 }
476
477 typedef struct policy_entry_t policy_entry_t;
478
479 /**
480 * installed kernel policy.
481 */
482 struct policy_entry_t {
483 /** Index assigned by the kernel */
484 u_int32_t index;
485
486 /** Direction of this policy: in, out, forward */
487 u_int8_t direction;
488
489 /** Parameters of installed policy */
490 struct {
491 /** Subnet and port */
492 host_t *net;
493 /** Subnet mask */
494 u_int8_t mask;
495 /** Protocol */
496 u_int8_t proto;
497 } src, dst;
498
499 /** Associated route installed for this policy */
500 route_entry_t *route;
501
502 /** List of SAs this policy is used by, ordered by priority */
503 linked_list_t *used_by;
504 };
505
506 /**
507 * Create a policy_entry_t object
508 */
509 static policy_entry_t *create_policy_entry(traffic_selector_t *src_ts,
510 traffic_selector_t *dst_ts,
511 policy_dir_t dir)
512 {
513 policy_entry_t *policy;
514 INIT(policy,
515 .direction = dir,
516 );
517 u_int16_t port;
518 u_int8_t proto;
519
520 src_ts->to_subnet(src_ts, &policy->src.net, &policy->src.mask);
521 dst_ts->to_subnet(dst_ts, &policy->dst.net, &policy->dst.mask);
522
523 /* src or dest proto may be "any" (0), use more restrictive one */
524 proto = max(src_ts->get_protocol(src_ts), dst_ts->get_protocol(dst_ts));
525 /* map the ports to ICMP type/code how the Linux kernel expects them, that
526 * is, type in src, code in dst */
527 if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6)
528 {
529 port = max(policy->src.net->get_port(policy->src.net),
530 policy->dst.net->get_port(policy->dst.net));
531 policy->src.net->set_port(policy->src.net,
532 traffic_selector_icmp_type(port));
533 policy->dst.net->set_port(policy->dst.net,
534 traffic_selector_icmp_code(port));
535 }
536 else if (!proto)
537 {
538 proto = IPSEC_PROTO_ANY;
539 }
540 policy->src.proto = policy->dst.proto = proto;
541
542 return policy;
543 }
544
545 /**
546 * Destroy a policy_entry_t object
547 */
548 static void policy_entry_destroy(policy_entry_t *policy,
549 private_kernel_pfkey_ipsec_t *this)
550 {
551 if (policy->route)
552 {
553 route_entry_destroy(policy->route);
554 }
555 if (policy->used_by)
556 {
557 policy->used_by->invoke_function(policy->used_by,
558 (linked_list_invoke_t)policy_sa_destroy,
559 &policy->direction, this);
560 policy->used_by->destroy(policy->used_by);
561 }
562 DESTROY_IF(policy->src.net);
563 DESTROY_IF(policy->dst.net);
564 free(policy);
565 }
566
567 /**
568 * compares two policy_entry_t
569 */
570 static inline bool policy_entry_equals(policy_entry_t *current,
571 policy_entry_t *policy)
572 {
573 return current->direction == policy->direction &&
574 current->src.proto == policy->src.proto &&
575 current->dst.proto == policy->dst.proto &&
576 current->src.mask == policy->src.mask &&
577 current->dst.mask == policy->dst.mask &&
578 current->src.net->equals(current->src.net, policy->src.net) &&
579 current->dst.net->equals(current->dst.net, policy->dst.net);
580 }
581
582 /**
583 * compare the given kernel index with that of a policy
584 */
585 static inline bool policy_entry_match_byindex(policy_entry_t *current,
586 u_int32_t *index)
587 {
588 return current->index == *index;
589 }
590
591 /**
592 * Calculate the priority of a policy
593 */
594 static inline u_int32_t get_priority(policy_entry_t *policy,
595 policy_priority_t prio)
596 {
597 u_int32_t priority = PRIO_BASE;
598 switch (prio)
599 {
600 case POLICY_PRIORITY_FALLBACK:
601 priority <<= 1;
602 /* fall-through */
603 case POLICY_PRIORITY_ROUTED:
604 priority <<= 1;
605 /* fall-through */
606 case POLICY_PRIORITY_DEFAULT:
607 priority <<= 1;
608 /* fall-trough */
609 case POLICY_PRIORITY_PASS:
610 break;
611 }
612 /* calculate priority based on selector size, small size = high prio */
613 priority -= policy->src.mask;
614 priority -= policy->dst.mask;
615 priority <<= 2; /* make some room for the two flags */
616 priority += policy->src.net->get_port(policy->src.net) ||
617 policy->dst.net->get_port(policy->dst.net) ?
618 0 : 2;
619 priority += policy->src.proto != IPSEC_PROTO_ANY ? 0 : 1;
620 return priority;
621 }
622
623 typedef struct pfkey_msg_t pfkey_msg_t;
624
625 struct pfkey_msg_t
626 {
627 /**
628 * PF_KEY message base
629 */
630 struct sadb_msg *msg;
631
632 /**
633 * PF_KEY message extensions
634 */
635 union {
636 struct sadb_ext *ext[SADB_EXT_MAX + 1];
637 struct {
638 struct sadb_ext *reserved; /* SADB_EXT_RESERVED */
639 struct sadb_sa *sa; /* SADB_EXT_SA */
640 struct sadb_lifetime *lft_current; /* SADB_EXT_LIFETIME_CURRENT */
641 struct sadb_lifetime *lft_hard; /* SADB_EXT_LIFETIME_HARD */
642 struct sadb_lifetime *lft_soft; /* SADB_EXT_LIFETIME_SOFT */
643 struct sadb_address *src; /* SADB_EXT_ADDRESS_SRC */
644 struct sadb_address *dst; /* SADB_EXT_ADDRESS_DST */
645 struct sadb_address *proxy; /* SADB_EXT_ADDRESS_PROXY */
646 struct sadb_key *key_auth; /* SADB_EXT_KEY_AUTH */
647 struct sadb_key *key_encr; /* SADB_EXT_KEY_ENCRYPT */
648 struct sadb_ident *id_src; /* SADB_EXT_IDENTITY_SRC */
649 struct sadb_ident *id_dst; /* SADB_EXT_IDENTITY_DST */
650 struct sadb_sens *sensitivity; /* SADB_EXT_SENSITIVITY */
651 struct sadb_prop *proposal; /* SADB_EXT_PROPOSAL */
652 struct sadb_supported *supported_auth; /* SADB_EXT_SUPPORTED_AUTH */
653 struct sadb_supported *supported_encr; /* SADB_EXT_SUPPORTED_ENCRYPT */
654 struct sadb_spirange *spirange; /* SADB_EXT_SPIRANGE */
655 struct sadb_x_kmprivate *x_kmprivate; /* SADB_X_EXT_KMPRIVATE */
656 struct sadb_x_policy *x_policy; /* SADB_X_EXT_POLICY */
657 struct sadb_x_sa2 *x_sa2; /* SADB_X_EXT_SA2 */
658 struct sadb_x_nat_t_type *x_natt_type; /* SADB_X_EXT_NAT_T_TYPE */
659 struct sadb_x_nat_t_port *x_natt_sport; /* SADB_X_EXT_NAT_T_SPORT */
660 struct sadb_x_nat_t_port *x_natt_dport; /* SADB_X_EXT_NAT_T_DPORT */
661 struct sadb_address *x_natt_oa; /* SADB_X_EXT_NAT_T_OA */
662 struct sadb_x_sec_ctx *x_sec_ctx; /* SADB_X_EXT_SEC_CTX */
663 struct sadb_x_kmaddress *x_kmaddress; /* SADB_X_EXT_KMADDRESS */
664 } __attribute__((__packed__));
665 };
666 };
667
668 ENUM(sadb_ext_type_names, SADB_EXT_RESERVED, SADB_EXT_MAX,
669 "SADB_EXT_RESERVED",
670 "SADB_EXT_SA",
671 "SADB_EXT_LIFETIME_CURRENT",
672 "SADB_EXT_LIFETIME_HARD",
673 "SADB_EXT_LIFETIME_SOFT",
674 "SADB_EXT_ADDRESS_SRC",
675 "SADB_EXT_ADDRESS_DST",
676 "SADB_EXT_ADDRESS_PROXY",
677 "SADB_EXT_KEY_AUTH",
678 "SADB_EXT_KEY_ENCRYPT",
679 "SADB_EXT_IDENTITY_SRC",
680 "SADB_EXT_IDENTITY_DST",
681 "SADB_EXT_SENSITIVITY",
682 "SADB_EXT_PROPOSAL",
683 "SADB_EXT_SUPPORTED_AUTH",
684 "SADB_EXT_SUPPORTED_ENCRYPT",
685 "SADB_EXT_SPIRANGE",
686 "SADB_X_EXT_KMPRIVATE",
687 "SADB_X_EXT_POLICY",
688 "SADB_X_EXT_SA2",
689 "SADB_X_EXT_NAT_T_TYPE",
690 "SADB_X_EXT_NAT_T_SPORT",
691 "SADB_X_EXT_NAT_T_DPORT",
692 "SADB_X_EXT_NAT_T_OA",
693 "SADB_X_EXT_SEC_CTX",
694 "SADB_X_EXT_KMADDRESS"
695 );
696
697 /**
698 * convert a protocol identifier to the PF_KEY sa type
699 */
700 static u_int8_t proto2satype(u_int8_t proto)
701 {
702 switch (proto)
703 {
704 case IPPROTO_ESP:
705 return SADB_SATYPE_ESP;
706 case IPPROTO_AH:
707 return SADB_SATYPE_AH;
708 case IPPROTO_COMP:
709 return SADB_X_SATYPE_IPCOMP;
710 default:
711 return proto;
712 }
713 }
714
715 /**
716 * convert a PF_KEY sa type to a protocol identifier
717 */
718 static u_int8_t satype2proto(u_int8_t satype)
719 {
720 switch (satype)
721 {
722 case SADB_SATYPE_ESP:
723 return IPPROTO_ESP;
724 case SADB_SATYPE_AH:
725 return IPPROTO_AH;
726 case SADB_X_SATYPE_IPCOMP:
727 return IPPROTO_COMP;
728 default:
729 return satype;
730 }
731 }
732
733 /**
734 * convert the general ipsec mode to the one defined in ipsec.h
735 */
736 static u_int8_t mode2kernel(ipsec_mode_t mode)
737 {
738 switch (mode)
739 {
740 case MODE_TRANSPORT:
741 return IPSEC_MODE_TRANSPORT;
742 case MODE_TUNNEL:
743 return IPSEC_MODE_TUNNEL;
744 #ifdef HAVE_IPSEC_MODE_BEET
745 case MODE_BEET:
746 return IPSEC_MODE_BEET;
747 #endif
748 default:
749 return mode;
750 }
751 }
752
753 /**
754 * convert the general policy direction to the one defined in ipsec.h
755 */
756 static u_int8_t dir2kernel(policy_dir_t dir)
757 {
758 switch (dir)
759 {
760 case POLICY_IN:
761 return IPSEC_DIR_INBOUND;
762 case POLICY_OUT:
763 return IPSEC_DIR_OUTBOUND;
764 #ifdef HAVE_IPSEC_DIR_FWD
765 case POLICY_FWD:
766 return IPSEC_DIR_FWD;
767 #endif
768 default:
769 return IPSEC_DIR_INVALID;
770 }
771 }
772
773 /**
774 * convert the policy type to the one defined in ipsec.h
775 */
776 static inline u_int16_t type2kernel(policy_type_t type)
777 {
778 switch (type)
779 {
780 case POLICY_IPSEC:
781 return IPSEC_POLICY_IPSEC;
782 case POLICY_PASS:
783 return IPSEC_POLICY_NONE;
784 case POLICY_DROP:
785 return IPSEC_POLICY_DISCARD;
786 }
787 return type;
788 }
789
790 #ifdef SADB_X_MIGRATE
791 /**
792 * convert the policy direction in ipsec.h to the general one.
793 */
794 static policy_dir_t kernel2dir(u_int8_t dir)
795 {
796 switch (dir)
797 {
798 case IPSEC_DIR_INBOUND:
799 return POLICY_IN;
800 case IPSEC_DIR_OUTBOUND:
801 return POLICY_OUT;
802 #ifdef HAVE_IPSEC_DIR_FWD
803 case IPSEC_DIR_FWD:
804 return POLICY_FWD;
805 #endif
806 default:
807 return dir;
808 }
809 }
810 #endif /*SADB_X_MIGRATE*/
811
812 typedef struct kernel_algorithm_t kernel_algorithm_t;
813
814 /**
815 * Mapping of IKEv2 algorithms to PF_KEY algorithms
816 */
817 struct kernel_algorithm_t {
818 /**
819 * Identifier specified in IKEv2
820 */
821 int ikev2;
822
823 /**
824 * Identifier as defined in pfkeyv2.h
825 */
826 int kernel;
827 };
828
829 #define END_OF_LIST -1
830
831 /**
832 * Algorithms for encryption
833 */
834 static kernel_algorithm_t encryption_algs[] = {
835 /* {ENCR_DES_IV64, 0 }, */
836 {ENCR_DES, SADB_EALG_DESCBC },
837 {ENCR_3DES, SADB_EALG_3DESCBC },
838 /* {ENCR_RC5, 0 }, */
839 /* {ENCR_IDEA, 0 }, */
840 {ENCR_CAST, SADB_X_EALG_CASTCBC },
841 {ENCR_BLOWFISH, SADB_X_EALG_BLOWFISHCBC },
842 /* {ENCR_3IDEA, 0 }, */
843 /* {ENCR_DES_IV32, 0 }, */
844 {ENCR_NULL, SADB_EALG_NULL },
845 {ENCR_AES_CBC, SADB_X_EALG_AESCBC },
846 #ifdef SADB_X_EALG_AESCTR
847 {ENCR_AES_CTR, SADB_X_EALG_AESCTR },
848 #endif
849 /* {ENCR_AES_CCM_ICV8, SADB_X_EALG_AES_CCM_ICV8 }, */
850 /* {ENCR_AES_CCM_ICV12, SADB_X_EALG_AES_CCM_ICV12 }, */
851 /* {ENCR_AES_CCM_ICV16, SADB_X_EALG_AES_CCM_ICV16 }, */
852 #ifdef SADB_X_EALG_AES_GCM_ICV8 /* assume the others are defined too */
853 {ENCR_AES_GCM_ICV8, SADB_X_EALG_AES_GCM_ICV8 },
854 {ENCR_AES_GCM_ICV12, SADB_X_EALG_AES_GCM_ICV12 },
855 {ENCR_AES_GCM_ICV16, SADB_X_EALG_AES_GCM_ICV16 },
856 #endif
857 #ifdef SADB_X_EALG_CAMELLIACBC
858 {ENCR_CAMELLIA_CBC, SADB_X_EALG_CAMELLIACBC },
859 #endif
860 {END_OF_LIST, 0 },
861 };
862
863 /**
864 * Algorithms for integrity protection
865 */
866 static kernel_algorithm_t integrity_algs[] = {
867 {AUTH_HMAC_MD5_96, SADB_AALG_MD5HMAC },
868 {AUTH_HMAC_SHA1_96, SADB_AALG_SHA1HMAC },
869 {AUTH_HMAC_SHA2_256_128, SADB_X_AALG_SHA2_256HMAC },
870 {AUTH_HMAC_SHA2_384_192, SADB_X_AALG_SHA2_384HMAC },
871 {AUTH_HMAC_SHA2_512_256, SADB_X_AALG_SHA2_512HMAC },
872 /* {AUTH_DES_MAC, 0, }, */
873 /* {AUTH_KPDK_MD5, 0, }, */
874 #ifdef SADB_X_AALG_AES_XCBC_MAC
875 {AUTH_AES_XCBC_96, SADB_X_AALG_AES_XCBC_MAC, },
876 #endif
877 {END_OF_LIST, 0, },
878 };
879
880 /**
881 * Algorithms for IPComp, unused yet
882 */
883 static kernel_algorithm_t compression_algs[] = {
884 /* {IPCOMP_OUI, 0 }, */
885 {IPCOMP_DEFLATE, SADB_X_CALG_DEFLATE },
886 #ifdef SADB_X_CALG_LZS
887 {IPCOMP_LZS, SADB_X_CALG_LZS },
888 #endif
889 #ifdef SADB_X_CALG_LZJH
890 {IPCOMP_LZJH, SADB_X_CALG_LZJH },
891 #endif
892 {END_OF_LIST, 0 },
893 };
894
895 /**
896 * Look up a kernel algorithm ID and its key size
897 */
898 static int lookup_algorithm(transform_type_t type, int ikev2)
899 {
900 kernel_algorithm_t *list;
901 u_int16_t alg = 0;
902
903 switch (type)
904 {
905 case ENCRYPTION_ALGORITHM:
906 list = encryption_algs;
907 break;
908 case INTEGRITY_ALGORITHM:
909 list = integrity_algs;
910 break;
911 case COMPRESSION_ALGORITHM:
912 list = compression_algs;
913 break;
914 default:
915 return 0;
916 }
917 while (list->ikev2 != END_OF_LIST)
918 {
919 if (ikev2 == list->ikev2)
920 {
921 return list->kernel;
922 }
923 list++;
924 }
925 charon->kernel->lookup_algorithm(charon->kernel, ikev2, type, &alg, NULL);
926 return alg;
927 }
928
929 /**
930 * Helper to set a port in a sockaddr_t, the port has to be in host order
931 */
932 static void set_port(sockaddr_t *addr, u_int16_t port)
933 {
934 switch (addr->sa_family)
935 {
936 case AF_INET:
937 {
938 struct sockaddr_in *sin = (struct sockaddr_in*)addr;
939 sin->sin_port = htons(port);
940 break;
941 }
942 case AF_INET6:
943 {
944 struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)addr;
945 sin6->sin6_port = htons(port);
946 break;
947 }
948 }
949 }
950
951 /**
952 * Copy a host_t as sockaddr_t to the given memory location.
953 * @return the number of bytes copied
954 */
955 static size_t hostcpy(void *dest, host_t *host, bool include_port)
956 {
957 sockaddr_t *addr = host->get_sockaddr(host), *dest_addr = dest;
958 socklen_t *len = host->get_sockaddr_len(host);
959
960 memcpy(dest, addr, *len);
961 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
962 dest_addr->sa_len = *len;
963 #endif
964 if (!include_port)
965 {
966 set_port(dest_addr, 0);
967 }
968 return *len;
969 }
970
971 /**
972 * add a host to the given sadb_msg
973 */
974 static void add_addr_ext(struct sadb_msg *msg, host_t *host, u_int16_t type,
975 u_int8_t proto, u_int8_t prefixlen, bool include_port)
976 {
977 struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg);
978 size_t len;
979
980 addr->sadb_address_exttype = type;
981 addr->sadb_address_proto = proto;
982 addr->sadb_address_prefixlen = prefixlen;
983 len = hostcpy(addr + 1, host, include_port);
984 addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len);
985 PFKEY_EXT_ADD(msg, addr);
986 }
987
988 /**
989 * adds an empty address extension to the given sadb_msg
990 */
991 static void add_anyaddr_ext(struct sadb_msg *msg, int family, u_int8_t type)
992 {
993 socklen_t len = (family == AF_INET) ? sizeof(struct sockaddr_in) :
994 sizeof(struct sockaddr_in6);
995 struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg);
996 addr->sadb_address_exttype = type;
997 sockaddr_t *saddr = (sockaddr_t*)(addr + 1);
998 saddr->sa_family = family;
999 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1000 saddr->sa_len = len;
1001 #endif
1002 addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len);
1003 PFKEY_EXT_ADD(msg, addr);
1004 }
1005
1006 #ifdef HAVE_NATT
1007 /**
1008 * add udp encap extensions to a sadb_msg
1009 */
1010 static void add_encap_ext(struct sadb_msg *msg, host_t *src, host_t *dst)
1011 {
1012 struct sadb_x_nat_t_type* nat_type;
1013 struct sadb_x_nat_t_port* nat_port;
1014
1015 nat_type = (struct sadb_x_nat_t_type*)PFKEY_EXT_ADD_NEXT(msg);
1016 nat_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1017 nat_type->sadb_x_nat_t_type_len = PFKEY_LEN(sizeof(*nat_type));
1018 nat_type->sadb_x_nat_t_type_type = UDP_ENCAP_ESPINUDP;
1019 PFKEY_EXT_ADD(msg, nat_type);
1020
1021 nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
1022 nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1023 nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port));
1024 nat_port->sadb_x_nat_t_port_port = htons(src->get_port(src));
1025 PFKEY_EXT_ADD(msg, nat_port);
1026
1027 nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
1028 nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1029 nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port));
1030 nat_port->sadb_x_nat_t_port_port = htons(dst->get_port(dst));
1031 PFKEY_EXT_ADD(msg, nat_port);
1032 }
1033 #endif /*HAVE_NATT*/
1034
1035 /**
1036 * Convert a sadb_address to a traffic_selector
1037 */
1038 static traffic_selector_t* sadb_address2ts(struct sadb_address *address)
1039 {
1040 traffic_selector_t *ts;
1041 host_t *host;
1042 u_int8_t proto;
1043
1044 proto = address->sadb_address_proto;
1045 proto = proto == IPSEC_PROTO_ANY ? 0 : proto;
1046
1047 /* The Linux 2.6 kernel does not set the protocol and port information
1048 * in the src and dst sadb_address extensions of the SADB_ACQUIRE message.
1049 */
1050 host = host_create_from_sockaddr((sockaddr_t*)&address[1]);
1051 ts = traffic_selector_create_from_subnet(host,
1052 address->sadb_address_prefixlen,
1053 proto, host->get_port(host),
1054 host->get_port(host) ?: 65535);
1055 return ts;
1056 }
1057
1058 /**
1059 * Parses a pfkey message received from the kernel
1060 */
1061 static status_t parse_pfkey_message(struct sadb_msg *msg, pfkey_msg_t *out)
1062 {
1063 struct sadb_ext* ext;
1064 size_t len;
1065
1066 memset(out, 0, sizeof(pfkey_msg_t));
1067 out->msg = msg;
1068
1069 len = msg->sadb_msg_len;
1070 len -= PFKEY_LEN(sizeof(struct sadb_msg));
1071
1072 ext = (struct sadb_ext*)(((char*)msg) + sizeof(struct sadb_msg));
1073
1074 while (len >= PFKEY_LEN(sizeof(struct sadb_ext)))
1075 {
1076 DBG3(DBG_KNL, " %N", sadb_ext_type_names, ext->sadb_ext_type);
1077 if (ext->sadb_ext_len < PFKEY_LEN(sizeof(struct sadb_ext)) ||
1078 ext->sadb_ext_len > len)
1079 {
1080 DBG1(DBG_KNL, "length of %N extension is invalid",
1081 sadb_ext_type_names, ext->sadb_ext_type);
1082 break;
1083 }
1084
1085 if ((ext->sadb_ext_type > SADB_EXT_MAX) || (!ext->sadb_ext_type))
1086 {
1087 DBG1(DBG_KNL, "type of PF_KEY extension (%d) is invalid",
1088 ext->sadb_ext_type);
1089 break;
1090 }
1091
1092 if (out->ext[ext->sadb_ext_type])
1093 {
1094 DBG1(DBG_KNL, "duplicate %N extension",
1095 sadb_ext_type_names, ext->sadb_ext_type);
1096 break;
1097 }
1098
1099 out->ext[ext->sadb_ext_type] = ext;
1100 ext = PFKEY_EXT_NEXT_LEN(ext, len);
1101 }
1102
1103 if (len)
1104 {
1105 DBG1(DBG_KNL, "PF_KEY message length is invalid");
1106 return FAILED;
1107 }
1108
1109 return SUCCESS;
1110 }
1111
1112 /**
1113 * Send a message to a specific PF_KEY socket and handle the response.
1114 */
1115 static status_t pfkey_send_socket(private_kernel_pfkey_ipsec_t *this, int socket,
1116 struct sadb_msg *in, struct sadb_msg **out, size_t *out_len)
1117 {
1118 unsigned char buf[PFKEY_BUFFER_SIZE];
1119 struct sadb_msg *msg;
1120 int in_len, len;
1121
1122 this->mutex_pfkey->lock(this->mutex_pfkey);
1123
1124 /* FIXME: our usage of sequence numbers is probably wrong. check RFC 2367,
1125 * in particular the behavior in response to an SADB_ACQUIRE. */
1126 in->sadb_msg_seq = ++this->seq;
1127 in->sadb_msg_pid = getpid();
1128
1129 in_len = PFKEY_USER_LEN(in->sadb_msg_len);
1130
1131 while (TRUE)
1132 {
1133 len = send(socket, in, in_len, 0);
1134
1135 if (len != in_len)
1136 {
1137 if (errno == EINTR)
1138 {
1139 /* interrupted, try again */
1140 continue;
1141 }
1142 this->mutex_pfkey->unlock(this->mutex_pfkey);
1143 DBG1(DBG_KNL, "error sending to PF_KEY socket: %s",
1144 strerror(errno));
1145 return FAILED;
1146 }
1147 break;
1148 }
1149
1150 while (TRUE)
1151 {
1152 msg = (struct sadb_msg*)buf;
1153
1154 len = recv(socket, buf, sizeof(buf), 0);
1155
1156 if (len < 0)
1157 {
1158 if (errno == EINTR)
1159 {
1160 DBG1(DBG_KNL, "got interrupted");
1161 /* interrupted, try again */
1162 continue;
1163 }
1164 DBG1(DBG_KNL, "error reading from PF_KEY socket: %s",
1165 strerror(errno));
1166 this->mutex_pfkey->unlock(this->mutex_pfkey);
1167 return FAILED;
1168 }
1169 if (len < sizeof(struct sadb_msg) ||
1170 msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
1171 {
1172 DBG1(DBG_KNL, "received corrupted PF_KEY message");
1173 this->mutex_pfkey->unlock(this->mutex_pfkey);
1174 return FAILED;
1175 }
1176 if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
1177 {
1178 DBG1(DBG_KNL, "buffer was too small to receive the complete PF_KEY "
1179 "message");
1180 this->mutex_pfkey->unlock(this->mutex_pfkey);
1181 return FAILED;
1182 }
1183 if (msg->sadb_msg_pid != in->sadb_msg_pid)
1184 {
1185 DBG2(DBG_KNL, "received PF_KEY message is not intended for us");
1186 continue;
1187 }
1188 if (msg->sadb_msg_seq != this->seq)
1189 {
1190 DBG2(DBG_KNL, "received PF_KEY message with unexpected sequence "
1191 "number, was %d expected %d", msg->sadb_msg_seq,
1192 this->seq);
1193 if (msg->sadb_msg_seq == 0)
1194 {
1195 /* FreeBSD and Mac OS X do this for the response to
1196 * SADB_X_SPDGET (but not for the response to SADB_GET).
1197 * FreeBSD: 'key_spdget' in /usr/src/sys/netipsec/key.c. */
1198 }
1199 else if (msg->sadb_msg_seq < this->seq)
1200 {
1201 continue;
1202 }
1203 else
1204 {
1205 this->mutex_pfkey->unlock(this->mutex_pfkey);
1206 return FAILED;
1207 }
1208 }
1209 if (msg->sadb_msg_type != in->sadb_msg_type)
1210 {
1211 DBG2(DBG_KNL, "received PF_KEY message of wrong type, "
1212 "was %d expected %d, ignoring", msg->sadb_msg_type,
1213 in->sadb_msg_type);
1214 }
1215 break;
1216 }
1217
1218 *out_len = len;
1219 *out = (struct sadb_msg*)malloc(len);
1220 memcpy(*out, buf, len);
1221
1222 this->mutex_pfkey->unlock(this->mutex_pfkey);
1223 return SUCCESS;
1224 }
1225
1226 /**
1227 * Send a message to the default PF_KEY socket and handle the response.
1228 */
1229 static status_t pfkey_send(private_kernel_pfkey_ipsec_t *this,
1230 struct sadb_msg *in, struct sadb_msg **out,
1231 size_t *out_len)
1232 {
1233 return pfkey_send_socket(this, this->socket, in, out, out_len);
1234 }
1235
1236 /**
1237 * Process a SADB_ACQUIRE message from the kernel
1238 */
1239 static void process_acquire(private_kernel_pfkey_ipsec_t *this,
1240 struct sadb_msg* msg)
1241 {
1242 pfkey_msg_t response;
1243 u_int32_t index, reqid = 0;
1244 traffic_selector_t *src_ts, *dst_ts;
1245 policy_entry_t *policy;
1246 policy_sa_t *sa;
1247
1248 switch (msg->sadb_msg_satype)
1249 {
1250 case SADB_SATYPE_UNSPEC:
1251 case SADB_SATYPE_ESP:
1252 case SADB_SATYPE_AH:
1253 break;
1254 default:
1255 /* acquire for AH/ESP only */
1256 return;
1257 }
1258 DBG2(DBG_KNL, "received an SADB_ACQUIRE");
1259
1260 if (parse_pfkey_message(msg, &response) != SUCCESS)
1261 {
1262 DBG1(DBG_KNL, "parsing SADB_ACQUIRE from kernel failed");
1263 return;
1264 }
1265
1266 index = response.x_policy->sadb_x_policy_id;
1267 this->mutex->lock(this->mutex);
1268 if (this->policies->find_first(this->policies,
1269 (linked_list_match_t)policy_entry_match_byindex,
1270 (void**)&policy, &index) == SUCCESS &&
1271 policy->used_by->get_first(policy->used_by, (void**)&sa) == SUCCESS)
1272 {
1273 reqid = sa->sa->cfg.reqid;
1274 }
1275 else
1276 {
1277 DBG1(DBG_KNL, "received an SADB_ACQUIRE with policy id %d but no "
1278 "matching policy found", index);
1279 }
1280 this->mutex->unlock(this->mutex);
1281
1282 src_ts = sadb_address2ts(response.src);
1283 dst_ts = sadb_address2ts(response.dst);
1284
1285 charon->kernel->acquire(charon->kernel, reqid, src_ts, dst_ts);
1286 }
1287
1288 /**
1289 * Process a SADB_EXPIRE message from the kernel
1290 */
1291 static void process_expire(private_kernel_pfkey_ipsec_t *this,
1292 struct sadb_msg* msg)
1293 {
1294 pfkey_msg_t response;
1295 u_int8_t protocol;
1296 u_int32_t spi;
1297 host_t *dst;
1298 bool hard;
1299
1300 DBG2(DBG_KNL, "received an SADB_EXPIRE");
1301
1302 if (parse_pfkey_message(msg, &response) != SUCCESS)
1303 {
1304 DBG1(DBG_KNL, "parsing SADB_EXPIRE from kernel failed");
1305 return;
1306 }
1307
1308 protocol = satype2proto(msg->sadb_msg_satype);
1309 spi = response.sa->sadb_sa_spi;
1310 hard = response.lft_hard != NULL;
1311
1312 if (protocol == IPPROTO_ESP || protocol == IPPROTO_AH)
1313 {
1314 dst = host_create_from_sockaddr((sockaddr_t*)(response.dst + 1));
1315 if (dst)
1316 {
1317 charon->kernel->expire(charon->kernel, protocol, spi, dst, hard);
1318 dst->destroy(dst);
1319 }
1320 }
1321 }
1322
1323 #ifdef SADB_X_MIGRATE
1324 /**
1325 * Process a SADB_X_MIGRATE message from the kernel
1326 */
1327 static void process_migrate(private_kernel_pfkey_ipsec_t *this,
1328 struct sadb_msg* msg)
1329 {
1330 pfkey_msg_t response;
1331 traffic_selector_t *src_ts, *dst_ts;
1332 policy_dir_t dir;
1333 u_int32_t reqid = 0;
1334 host_t *local = NULL, *remote = NULL;
1335
1336 DBG2(DBG_KNL, "received an SADB_X_MIGRATE");
1337
1338 if (parse_pfkey_message(msg, &response) != SUCCESS)
1339 {
1340 DBG1(DBG_KNL, "parsing SADB_X_MIGRATE from kernel failed");
1341 return;
1342 }
1343 src_ts = sadb_address2ts(response.src);
1344 dst_ts = sadb_address2ts(response.dst);
1345 dir = kernel2dir(response.x_policy->sadb_x_policy_dir);
1346 DBG2(DBG_KNL, " policy %R === %R %N, id %u", src_ts, dst_ts,
1347 policy_dir_names, dir);
1348
1349 /* SADB_X_EXT_KMADDRESS is not present in unpatched kernels < 2.6.28 */
1350 if (response.x_kmaddress)
1351 {
1352 sockaddr_t *local_addr, *remote_addr;
1353 u_int32_t local_len;
1354
1355 local_addr = (sockaddr_t*)&response.x_kmaddress[1];
1356 local = host_create_from_sockaddr(local_addr);
1357 local_len = (local_addr->sa_family == AF_INET6)?
1358 sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
1359 remote_addr = (sockaddr_t*)((u_int8_t*)local_addr + local_len);
1360 remote = host_create_from_sockaddr(remote_addr);
1361 DBG2(DBG_KNL, " kmaddress: %H...%H", local, remote);
1362 }
1363
1364 if (src_ts && dst_ts && local && remote)
1365 {
1366 charon->kernel->migrate(charon->kernel, reqid, src_ts, dst_ts, dir,
1367 local, remote);
1368 }
1369 else
1370 {
1371 DESTROY_IF(src_ts);
1372 DESTROY_IF(dst_ts);
1373 DESTROY_IF(local);
1374 DESTROY_IF(remote);
1375 }
1376 }
1377 #endif /*SADB_X_MIGRATE*/
1378
1379 #ifdef SADB_X_NAT_T_NEW_MAPPING
1380 /**
1381 * Process a SADB_X_NAT_T_NEW_MAPPING message from the kernel
1382 */
1383 static void process_mapping(private_kernel_pfkey_ipsec_t *this,
1384 struct sadb_msg* msg)
1385 {
1386 pfkey_msg_t response;
1387 u_int32_t spi;
1388 sockaddr_t *sa;
1389 host_t *dst, *new;
1390
1391 DBG2(DBG_KNL, "received an SADB_X_NAT_T_NEW_MAPPING");
1392
1393 if (parse_pfkey_message(msg, &response) != SUCCESS)
1394 {
1395 DBG1(DBG_KNL, "parsing SADB_X_NAT_T_NEW_MAPPING from kernel failed");
1396 return;
1397 }
1398
1399 if (!response.x_sa2)
1400 {
1401 DBG1(DBG_KNL, "received SADB_X_NAT_T_NEW_MAPPING is missing required "
1402 "information");
1403 return;
1404 }
1405
1406 spi = response.sa->sadb_sa_spi;
1407
1408 if (satype2proto(msg->sadb_msg_satype) != IPPROTO_ESP)
1409 {
1410 return;
1411 }
1412
1413 sa = (sockaddr_t*)(response.dst + 1);
1414 dst = host_create_from_sockaddr(sa);
1415 switch (sa->sa_family)
1416 {
1417 case AF_INET:
1418 {
1419 struct sockaddr_in *sin = (struct sockaddr_in*)sa;
1420 sin->sin_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1421 break;
1422 }
1423 case AF_INET6:
1424 {
1425 struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa;
1426 sin6->sin6_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1427 break;
1428 }
1429 default:
1430 break;
1431 }
1432 if (dst)
1433 {
1434 new = host_create_from_sockaddr(sa);
1435 if (new)
1436 {
1437 charon->kernel->mapping(charon->kernel, IPPROTO_ESP, spi, dst, new);
1438 new->destroy(new);
1439 }
1440 dst->destroy(dst);
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, bool update,
1614 linked_list_t *src_ts, linked_list_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 update, NULL, NULL);
1633 ipcomp = IPCOMP_NONE;
1634 /* use transport mode ESP SA, IPComp uses tunnel mode */
1635 mode = MODE_TRANSPORT;
1636 }
1637
1638 if (update)
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 struct {
2077 u_int8_t proto;
2078 char *name;
2079 } protos[] = {
2080 { SADB_SATYPE_AH, "AH" },
2081 { SADB_SATYPE_ESP, "ESP" },
2082 { SADB_X_SATYPE_IPCOMP, "IPComp" },
2083 };
2084 size_t len;
2085 int i;
2086
2087 memset(&request, 0, sizeof(request));
2088
2089 msg = (struct sadb_msg*)request;
2090 msg->sadb_msg_version = PF_KEY_V2;
2091 msg->sadb_msg_type = SADB_FLUSH;
2092 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2093
2094 for (i = 0; i < countof(protos); i++)
2095 {
2096 DBG2(DBG_KNL, "flushing all %s SAD entries", protos[i].name);
2097
2098 msg->sadb_msg_satype = protos[i].proto;
2099 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2100 {
2101 DBG1(DBG_KNL, "unable to flush %s SAD entries", protos[i].name);
2102 return FAILED;
2103 }
2104 else if (out->sadb_msg_errno)
2105 {
2106 DBG1(DBG_KNL, "unable to flush %s SAD entries: %s (%d)",
2107 protos[i].name, strerror(out->sadb_msg_errno),
2108 out->sadb_msg_errno);
2109 free(out);
2110 return FAILED;
2111 }
2112 free(out);
2113 }
2114 return SUCCESS;
2115 }
2116
2117 /**
2118 * Add an explicit exclude route to a routing entry
2119 */
2120 static void add_exclude_route(private_kernel_pfkey_ipsec_t *this,
2121 route_entry_t *route, host_t *src, host_t *dst)
2122 {
2123 enumerator_t *enumerator;
2124 exclude_route_t *exclude;
2125 host_t *gtw;
2126
2127 enumerator = this->excludes->create_enumerator(this->excludes);
2128 while (enumerator->enumerate(enumerator, &exclude))
2129 {
2130 if (dst->ip_equals(dst, exclude->dst))
2131 {
2132 route->exclude = exclude;
2133 exclude->refs++;
2134 }
2135 }
2136 enumerator->destroy(enumerator);
2137
2138 if (!route->exclude)
2139 {
2140 DBG2(DBG_KNL, "installing new exclude route for %H src %H", dst, src);
2141 gtw = charon->kernel->get_nexthop(charon->kernel, dst, -1, NULL);
2142 if (gtw)
2143 {
2144 char *if_name = NULL;
2145
2146 if (charon->kernel->get_interface(charon->kernel, src, &if_name) &&
2147 charon->kernel->add_route(charon->kernel,
2148 dst->get_address(dst),
2149 dst->get_family(dst) == AF_INET ? 32 : 128,
2150 gtw, src, if_name) == SUCCESS)
2151 {
2152 INIT(exclude,
2153 .dst = dst->clone(dst),
2154 .src = src->clone(src),
2155 .gtw = gtw->clone(gtw),
2156 .refs = 1,
2157 );
2158 route->exclude = exclude;
2159 this->excludes->insert_last(this->excludes, exclude);
2160 }
2161 else
2162 {
2163 DBG1(DBG_KNL, "installing exclude route for %H failed", dst);
2164 }
2165 gtw->destroy(gtw);
2166 free(if_name);
2167 }
2168 else
2169 {
2170 DBG1(DBG_KNL, "gateway lookup for for %H failed", dst);
2171 }
2172 }
2173 }
2174
2175 /**
2176 * Remove an exclude route attached to a routing entry
2177 */
2178 static void remove_exclude_route(private_kernel_pfkey_ipsec_t *this,
2179 route_entry_t *route)
2180 {
2181 if (route->exclude)
2182 {
2183 enumerator_t *enumerator;
2184 exclude_route_t *exclude;
2185 bool removed = FALSE;
2186 host_t *dst;
2187
2188 enumerator = this->excludes->create_enumerator(this->excludes);
2189 while (enumerator->enumerate(enumerator, &exclude))
2190 {
2191 if (route->exclude == exclude)
2192 {
2193 if (--exclude->refs == 0)
2194 {
2195 this->excludes->remove_at(this->excludes, enumerator);
2196 removed = TRUE;
2197 break;
2198 }
2199 }
2200 }
2201 enumerator->destroy(enumerator);
2202
2203 if (removed)
2204 {
2205 char *if_name = NULL;
2206
2207 dst = route->exclude->dst;
2208 DBG2(DBG_KNL, "uninstalling exclude route for %H src %H",
2209 dst, route->exclude->src);
2210 if (charon->kernel->get_interface(
2211 charon->kernel,
2212 route->exclude->src, &if_name) &&
2213 charon->kernel->del_route(charon->kernel,
2214 dst->get_address(dst),
2215 dst->get_family(dst) == AF_INET ? 32 : 128,
2216 route->exclude->gtw, route->exclude->src,
2217 if_name) != SUCCESS)
2218 {
2219 DBG1(DBG_KNL, "uninstalling exclude route for %H failed", dst);
2220 }
2221 exclude_route_destroy(route->exclude);
2222 free(if_name);
2223 }
2224 route->exclude = NULL;
2225 }
2226 }
2227
2228 /**
2229 * Try to install a route to the given inbound policy
2230 */
2231 static bool install_route(private_kernel_pfkey_ipsec_t *this,
2232 policy_entry_t *policy, policy_sa_in_t *in)
2233 {
2234 route_entry_t *route, *old;
2235 host_t *host, *src, *dst;
2236 bool is_virtual;
2237
2238 if (charon->kernel->get_address_by_ts(charon->kernel, in->dst_ts, &host,
2239 &is_virtual) != SUCCESS)
2240 {
2241 return FALSE;
2242 }
2243
2244 /* switch src/dst, as we handle an IN policy */
2245 src = in->generic.sa->dst;
2246 dst = in->generic.sa->src;
2247
2248 INIT(route,
2249 .prefixlen = policy->src.mask,
2250 .src_ip = host,
2251 .dst_net = chunk_clone(policy->src.net->get_address(policy->src.net)),
2252 );
2253
2254 if (!dst->is_anyaddr(dst))
2255 {
2256 route->gateway = charon->kernel->get_nexthop(charon->kernel, dst, -1,
2257 src);
2258
2259 /* if the IP is virtual, we install the route over the interface it has
2260 * been installed on. Otherwise we use the interface we use for IKE, as
2261 * this is required for example on Linux. */
2262 if (is_virtual)
2263 {
2264 src = route->src_ip;
2265 }
2266 }
2267 else
2268 { /* for shunt policies */
2269 route->gateway = charon->kernel->get_nexthop(charon->kernel,
2270 policy->src.net, policy->src.mask,
2271 route->src_ip);
2272
2273 /* we don't have a source address, use the address we found */
2274 src = route->src_ip;
2275 }
2276
2277 /* get interface for route, using source address */
2278 if (!charon->kernel->get_interface(charon->kernel, src, &route->if_name))
2279 {
2280 route_entry_destroy(route);
2281 return FALSE;
2282 }
2283
2284 if (policy->route)
2285 {
2286 old = policy->route;
2287
2288 if (route_entry_equals(old, route))
2289 { /* such a route already exists */
2290 route_entry_destroy(route);
2291 return TRUE;
2292 }
2293 /* uninstall previously installed route */
2294 if (charon->kernel->del_route(charon->kernel, old->dst_net,
2295 old->prefixlen, old->gateway,
2296 old->src_ip, old->if_name) != SUCCESS)
2297 {
2298 DBG1(DBG_KNL, "error uninstalling route installed with policy "
2299 "%R === %R %N", in->src_ts, in->dst_ts,
2300 policy_dir_names, policy->direction);
2301 }
2302 route_entry_destroy(old);
2303 policy->route = NULL;
2304 }
2305
2306 /* if remote traffic selector covers the IKE peer, add an exclude route */
2307 if (charon->kernel->get_features(charon->kernel) & KERNEL_REQUIRE_EXCLUDE_ROUTE)
2308 {
2309 if (in->src_ts->is_host(in->src_ts, dst))
2310 {
2311 DBG1(DBG_KNL, "can't install route for %R === %R %N, conflicts "
2312 "with IKE traffic", in->src_ts, in->dst_ts, policy_dir_names,
2313 policy->direction);
2314 route_entry_destroy(route);
2315 return FALSE;
2316 }
2317 if (in->src_ts->includes(in->src_ts, dst))
2318 {
2319 add_exclude_route(this, route, in->generic.sa->dst, dst);
2320 }
2321 }
2322
2323 DBG2(DBG_KNL, "installing route: %R via %H src %H dev %s",
2324 in->src_ts, route->gateway, route->src_ip, route->if_name);
2325
2326 switch (charon->kernel->add_route(charon->kernel, route->dst_net,
2327 route->prefixlen, route->gateway,
2328 route->src_ip, route->if_name))
2329 {
2330 case ALREADY_DONE:
2331 /* route exists, do not uninstall */
2332 remove_exclude_route(this, route);
2333 route_entry_destroy(route);
2334 return TRUE;
2335 case SUCCESS:
2336 /* cache the installed route */
2337 policy->route = route;
2338 return TRUE;
2339 default:
2340 DBG1(DBG_KNL, "installing route failed: %R via %H src %H dev %s",
2341 in->src_ts, route->gateway, route->src_ip, route->if_name);
2342 remove_exclude_route(this, route);
2343 route_entry_destroy(route);
2344 return FALSE;
2345 }
2346 }
2347
2348 /**
2349 * Add or update a policy in the kernel.
2350 *
2351 * Note: The mutex has to be locked when entering this function.
2352 */
2353 static status_t add_policy_internal(private_kernel_pfkey_ipsec_t *this,
2354 policy_entry_t *policy, policy_sa_t *mapping, bool update)
2355 {
2356 unsigned char request[PFKEY_BUFFER_SIZE];
2357 struct sadb_msg *msg, *out;
2358 struct sadb_x_policy *pol;
2359 struct sadb_x_ipsecrequest *req;
2360 ipsec_sa_t *ipsec = mapping->sa;
2361 pfkey_msg_t response;
2362 size_t len;
2363 ipsec_mode_t proto_mode;
2364 status_t status;
2365
2366 memset(&request, 0, sizeof(request));
2367
2368 msg = (struct sadb_msg*)request;
2369 msg->sadb_msg_version = PF_KEY_V2;
2370 msg->sadb_msg_type = update ? SADB_X_SPDUPDATE : SADB_X_SPDADD;
2371 msg->sadb_msg_satype = 0;
2372 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2373
2374 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2375 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2376 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2377 pol->sadb_x_policy_id = 0;
2378 pol->sadb_x_policy_dir = dir2kernel(policy->direction);
2379 pol->sadb_x_policy_type = type2kernel(mapping->type);
2380 #ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY
2381 pol->sadb_x_policy_priority = mapping->priority;
2382 #endif
2383
2384 /* one or more sadb_x_ipsecrequest extensions are added to the
2385 * sadb_x_policy extension */
2386 proto_mode = ipsec->cfg.mode;
2387
2388 req = (struct sadb_x_ipsecrequest*)(pol + 1);
2389
2390 if (ipsec->cfg.ipcomp.transform != IPCOMP_NONE)
2391 {
2392 req->sadb_x_ipsecrequest_proto = IPPROTO_COMP;
2393
2394 /* !!! the length here MUST be in octets instead of 64 bit words */
2395 req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2396 req->sadb_x_ipsecrequest_mode = mode2kernel(ipsec->cfg.mode);
2397 req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2398 req->sadb_x_ipsecrequest_level = (policy->direction == POLICY_OUT) ?
2399 IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_USE;
2400 if (ipsec->cfg.mode == MODE_TUNNEL)
2401 {
2402 len = hostcpy(req + 1, ipsec->src, FALSE);
2403 req->sadb_x_ipsecrequest_len += len;
2404 len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2405 req->sadb_x_ipsecrequest_len += len;
2406 /* use transport mode for other SAs */
2407 proto_mode = MODE_TRANSPORT;
2408 }
2409
2410 pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2411 req = (struct sadb_x_ipsecrequest*)((char*)(req) +
2412 req->sadb_x_ipsecrequest_len);
2413 }
2414
2415 req->sadb_x_ipsecrequest_proto = ipsec->cfg.esp.use ? IPPROTO_ESP
2416 : IPPROTO_AH;
2417 /* !!! the length here MUST be in octets instead of 64 bit words */
2418 req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2419 req->sadb_x_ipsecrequest_mode = mode2kernel(proto_mode);
2420 req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2421 req->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2422 if (proto_mode == MODE_TUNNEL)
2423 {
2424 len = hostcpy(req + 1, ipsec->src, FALSE);
2425 req->sadb_x_ipsecrequest_len += len;
2426 len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2427 req->sadb_x_ipsecrequest_len += len;
2428 }
2429
2430 pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2431 PFKEY_EXT_ADD(msg, pol);
2432
2433 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2434 policy->src.mask, TRUE);
2435 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2436 policy->dst.mask, TRUE);
2437
2438 #ifdef __FreeBSD__
2439 { /* on FreeBSD a lifetime has to be defined to be able to later query
2440 * the current use time. */
2441 struct sadb_lifetime *lft;
2442 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
2443 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2444 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
2445 lft->sadb_lifetime_addtime = LONG_MAX;
2446 PFKEY_EXT_ADD(msg, lft);
2447 }
2448 #endif
2449
2450 this->mutex->unlock(this->mutex);
2451
2452 status = pfkey_send(this, msg, &out, &len);
2453 if (status == SUCCESS && !update && out->sadb_msg_errno == EEXIST)
2454 {
2455 DBG1(DBG_KNL, "policy already exists, try to update it");
2456 free(out);
2457 msg->sadb_msg_type = SADB_X_SPDUPDATE;
2458 status = pfkey_send(this, msg, &out, &len);
2459 }
2460 if (status != SUCCESS)
2461 {
2462 return FAILED;
2463 }
2464 else if (out->sadb_msg_errno)
2465 {
2466 DBG1(DBG_KNL, "unable to %s policy: %s (%d)",
2467 update ? "update" : "add", strerror(out->sadb_msg_errno),
2468 out->sadb_msg_errno);
2469 free(out);
2470 return FAILED;
2471 }
2472 else if (parse_pfkey_message(out, &response) != SUCCESS)
2473 {
2474 DBG1(DBG_KNL, "unable to %s policy: parsing response from kernel "
2475 "failed", update ? "update" : "add");
2476 free(out);
2477 return FAILED;
2478 }
2479
2480 /* we try to find the policy again and update the kernel index */
2481 this->mutex->lock(this->mutex);
2482 if (this->policies->find_first(this->policies, NULL,
2483 (void**)&policy) != SUCCESS)
2484 {
2485 DBG2(DBG_KNL, "unable to update index, the policy is already gone, "
2486 "ignoring");
2487 this->mutex->unlock(this->mutex);
2488 free(out);
2489 return SUCCESS;
2490 }
2491 policy->index = response.x_policy->sadb_x_policy_id;
2492 free(out);
2493
2494 /* install a route, if:
2495 * - this is an inbound policy (to just get one for each child)
2496 * - we are in tunnel mode or install a bypass policy
2497 * - routing is not disabled via strongswan.conf
2498 */
2499 if (policy->direction == POLICY_IN && this->install_routes &&
2500 (mapping->type != POLICY_IPSEC || ipsec->cfg.mode != MODE_TRANSPORT))
2501 {
2502 install_route(this, policy, (policy_sa_in_t*)mapping);
2503 }
2504 this->mutex->unlock(this->mutex);
2505 return SUCCESS;
2506 }
2507
2508 METHOD(kernel_ipsec_t, add_policy, status_t,
2509 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
2510 traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
2511 policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa,
2512 mark_t mark, policy_priority_t priority)
2513 {
2514 policy_entry_t *policy, *found = NULL;
2515 policy_sa_t *assigned_sa, *current_sa;
2516 enumerator_t *enumerator;
2517 bool update = TRUE;
2518
2519 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2520 { /* FWD policies are not supported on all platforms */
2521 return SUCCESS;
2522 }
2523
2524 /* create a policy */
2525 policy = create_policy_entry(src_ts, dst_ts, direction);
2526
2527 /* find a matching policy */
2528 this->mutex->lock(this->mutex);
2529 if (this->policies->find_first(this->policies,
2530 (linked_list_match_t)policy_entry_equals,
2531 (void**)&found, policy) == SUCCESS)
2532 { /* use existing policy */
2533 DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing "
2534 "refcount", src_ts, dst_ts, policy_dir_names, direction);
2535 policy_entry_destroy(policy, this);
2536 policy = found;
2537 }
2538 else
2539 { /* use the new one, if we have no such policy */
2540 this->policies->insert_first(this->policies, policy);
2541 policy->used_by = linked_list_create();
2542 }
2543
2544 /* cache the assigned IPsec SA */
2545 assigned_sa = policy_sa_create(this, direction, type, src, dst, src_ts,
2546 dst_ts, sa);
2547 assigned_sa->priority = get_priority(policy, priority);
2548
2549 /* insert the SA according to its priority */
2550 enumerator = policy->used_by->create_enumerator(policy->used_by);
2551 while (enumerator->enumerate(enumerator, (void**)&current_sa))
2552 {
2553 if (current_sa->priority >= assigned_sa->priority)
2554 {
2555 break;
2556 }
2557 update = FALSE;
2558 }
2559 policy->used_by->insert_before(policy->used_by, enumerator, assigned_sa);
2560 enumerator->destroy(enumerator);
2561
2562 if (!update)
2563 { /* we don't update the policy if the priority is lower than that of the
2564 * currently installed one */
2565 this->mutex->unlock(this->mutex);
2566 return SUCCESS;
2567 }
2568
2569 DBG2(DBG_KNL, "%s policy %R === %R %N",
2570 found ? "updating" : "adding", src_ts, dst_ts,
2571 policy_dir_names, direction);
2572
2573 if (add_policy_internal(this, policy, assigned_sa, found) != SUCCESS)
2574 {
2575 DBG1(DBG_KNL, "unable to %s policy %R === %R %N",
2576 found ? "update" : "add", src_ts, dst_ts,
2577 policy_dir_names, direction);
2578 return FAILED;
2579 }
2580 return SUCCESS;
2581 }
2582
2583 METHOD(kernel_ipsec_t, query_policy, status_t,
2584 private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts,
2585 traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
2586 time_t *use_time)
2587 {
2588 unsigned char request[PFKEY_BUFFER_SIZE];
2589 struct sadb_msg *msg, *out;
2590 struct sadb_x_policy *pol;
2591 policy_entry_t *policy, *found = NULL;
2592 pfkey_msg_t response;
2593 size_t len;
2594
2595 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2596 { /* FWD policies are not supported on all platforms */
2597 return NOT_FOUND;
2598 }
2599
2600 DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts,
2601 policy_dir_names, direction);
2602
2603 /* create a policy */
2604 policy = create_policy_entry(src_ts, dst_ts, direction);
2605
2606 /* find a matching policy */
2607 this->mutex->lock(this->mutex);
2608 if (this->policies->find_first(this->policies,
2609 (linked_list_match_t)policy_entry_equals,
2610 (void**)&found, policy) != SUCCESS)
2611 {
2612 DBG1(DBG_KNL, "querying policy %R === %R %N failed, not found", src_ts,
2613 dst_ts, policy_dir_names, direction);
2614 policy_entry_destroy(policy, this);
2615 this->mutex->unlock(this->mutex);
2616 return NOT_FOUND;
2617 }
2618 policy_entry_destroy(policy, this);
2619 policy = found;
2620
2621 memset(&request, 0, sizeof(request));
2622
2623 msg = (struct sadb_msg*)request;
2624 msg->sadb_msg_version = PF_KEY_V2;
2625 msg->sadb_msg_type = SADB_X_SPDGET;
2626 msg->sadb_msg_satype = 0;
2627 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2628
2629 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2630 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2631 pol->sadb_x_policy_id = policy->index;
2632 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2633 pol->sadb_x_policy_dir = dir2kernel(direction);
2634 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2635 PFKEY_EXT_ADD(msg, pol);
2636
2637 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2638 policy->src.mask, TRUE);
2639 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2640 policy->dst.mask, TRUE);
2641
2642 this->mutex->unlock(this->mutex);
2643
2644 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2645 {
2646 DBG1(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts,
2647 policy_dir_names, direction);
2648 return FAILED;
2649 }
2650 else if (out->sadb_msg_errno)
2651 {
2652 DBG1(DBG_KNL, "unable to query policy %R === %R %N: %s (%d)", src_ts,
2653 dst_ts, policy_dir_names, direction,
2654 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2655 free(out);
2656 return FAILED;
2657 }
2658 else if (parse_pfkey_message(out, &response) != SUCCESS)
2659 {
2660 DBG1(DBG_KNL, "unable to query policy %R === %R %N: parsing response "
2661 "from kernel failed", src_ts, dst_ts, policy_dir_names,
2662 direction);
2663 free(out);
2664 return FAILED;
2665 }
2666 else if (response.lft_current == NULL)
2667 {
2668 DBG2(DBG_KNL, "unable to query policy %R === %R %N: kernel reports no "
2669 "use time", src_ts, dst_ts, policy_dir_names, direction);
2670 free(out);
2671 return FAILED;
2672 }
2673
2674 /* we need the monotonic time, but the kernel returns system time. */
2675 if (response.lft_current->sadb_lifetime_usetime)
2676 {
2677 *use_time = time_monotonic(NULL) -
2678 (time(NULL) - response.lft_current->sadb_lifetime_usetime);
2679 }
2680 else
2681 {
2682 *use_time = 0;
2683 }
2684 free(out);
2685 return SUCCESS;
2686 }
2687
2688 METHOD(kernel_ipsec_t, del_policy, status_t,
2689 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
2690 traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
2691 policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa,
2692 mark_t mark, policy_priority_t prio)
2693 {
2694 unsigned char request[PFKEY_BUFFER_SIZE];
2695 struct sadb_msg *msg, *out;
2696 struct sadb_x_policy *pol;
2697 policy_entry_t *policy, *found = NULL;
2698 policy_sa_t *mapping, *to_remove = NULL;
2699 enumerator_t *enumerator;
2700 bool first = TRUE, is_installed = TRUE;
2701 u_int32_t priority;
2702 size_t len;
2703 ipsec_sa_t assigned_sa = {
2704 .src = src,
2705 .dst = dst,
2706 .cfg = *sa,
2707 };
2708
2709 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2710 { /* FWD policies are not supported on all platforms */
2711 return SUCCESS;
2712 }
2713
2714 DBG2(DBG_KNL, "deleting policy %R === %R %N", src_ts, dst_ts,
2715 policy_dir_names, direction);
2716
2717 /* create a policy */
2718 policy = create_policy_entry(src_ts, dst_ts, direction);
2719
2720 /* find a matching policy */
2721 this->mutex->lock(this->mutex);
2722 if (this->policies->find_first(this->policies,
2723 (linked_list_match_t)policy_entry_equals,
2724 (void**)&found, policy) != SUCCESS)
2725 {
2726 DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", src_ts,
2727 dst_ts, policy_dir_names, direction);
2728 policy_entry_destroy(policy, this);
2729 this->mutex->unlock(this->mutex);
2730 return NOT_FOUND;
2731 }
2732 policy_entry_destroy(policy, this);
2733 policy = found;
2734
2735 /* remove mapping to SA by reqid and priority, if multiple match, which
2736 * could happen when rekeying due to an address change, remove the oldest */
2737 priority = get_priority(policy, prio);
2738 enumerator = policy->used_by->create_enumerator(policy->used_by);
2739 while (enumerator->enumerate(enumerator, (void**)&mapping))
2740 {
2741 if (priority == mapping->priority &&
2742 ipsec_sa_equals(mapping->sa, &assigned_sa))
2743 {
2744 to_remove = mapping;
2745 is_installed = first;
2746 }
2747 else if (priority < mapping->priority)
2748 {
2749 break;
2750 }
2751 first = FALSE;
2752 }
2753 enumerator->destroy(enumerator);
2754 if (!to_remove)
2755 { /* sanity check */
2756 this->mutex->unlock(this->mutex);
2757 return SUCCESS;
2758 }
2759 policy->used_by->remove(policy->used_by, to_remove, NULL);
2760 mapping = to_remove;
2761
2762 if (policy->used_by->get_count(policy->used_by) > 0)
2763 { /* policy is used by more SAs, keep in kernel */
2764 DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
2765 policy_sa_destroy(mapping, &direction, this);
2766
2767 if (!is_installed)
2768 { /* no need to update as the policy was not installed for this SA */
2769 this->mutex->unlock(this->mutex);
2770 return SUCCESS;
2771 }
2772
2773 DBG2(DBG_KNL, "updating policy %R === %R %N", src_ts, dst_ts,
2774 policy_dir_names, direction);
2775 policy->used_by->get_first(policy->used_by, (void**)&mapping);
2776 if (add_policy_internal(this, policy, mapping, TRUE) != SUCCESS)
2777 {
2778 DBG1(DBG_KNL, "unable to update policy %R === %R %N",
2779 src_ts, dst_ts, policy_dir_names, direction);
2780 return FAILED;
2781 }
2782 return SUCCESS;
2783 }
2784
2785 memset(&request, 0, sizeof(request));
2786
2787 msg = (struct sadb_msg*)request;
2788 msg->sadb_msg_version = PF_KEY_V2;
2789 msg->sadb_msg_type = SADB_X_SPDDELETE;
2790 msg->sadb_msg_satype = 0;
2791 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2792
2793 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2794 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2795 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2796 pol->sadb_x_policy_dir = dir2kernel(direction);
2797 pol->sadb_x_policy_type = type2kernel(mapping->type);
2798 PFKEY_EXT_ADD(msg, pol);
2799
2800 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2801 policy->src.mask, TRUE);
2802 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2803 policy->dst.mask, TRUE);
2804
2805 if (policy->route)
2806 {
2807 route_entry_t *route = policy->route;
2808 if (charon->kernel->del_route(charon->kernel, route->dst_net,
2809 route->prefixlen, route->gateway,
2810 route->src_ip, route->if_name) != SUCCESS)
2811 {
2812 DBG1(DBG_KNL, "error uninstalling route installed with "
2813 "policy %R === %R %N", src_ts, dst_ts,
2814 policy_dir_names, direction);
2815 }
2816 remove_exclude_route(this, route);
2817 }
2818
2819 this->policies->remove(this->policies, found, NULL);
2820 policy_sa_destroy(mapping, &direction, this);
2821 policy_entry_destroy(policy, this);
2822 this->mutex->unlock(this->mutex);
2823
2824 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2825 {
2826 DBG1(DBG_KNL, "unable to delete policy %R === %R %N", src_ts, dst_ts,
2827 policy_dir_names, direction);
2828 return FAILED;
2829 }
2830 else if (out->sadb_msg_errno)
2831 {
2832 DBG1(DBG_KNL, "unable to delete policy %R === %R %N: %s (%d)", src_ts,
2833 dst_ts, policy_dir_names, direction,
2834 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2835 free(out);
2836 return FAILED;
2837 }
2838 free(out);
2839 return SUCCESS;
2840 }
2841
2842 METHOD(kernel_ipsec_t, flush_policies, status_t,
2843 private_kernel_pfkey_ipsec_t *this)
2844 {
2845 unsigned char request[PFKEY_BUFFER_SIZE];
2846 struct sadb_msg *msg, *out;
2847 size_t len;
2848
2849 memset(&request, 0, sizeof(request));
2850
2851 DBG2(DBG_KNL, "flushing all policies from SPD");
2852
2853 msg = (struct sadb_msg*)request;
2854 msg->sadb_msg_version = PF_KEY_V2;
2855 msg->sadb_msg_type = SADB_X_SPDFLUSH;
2856 msg->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2857 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2858
2859 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2860 {
2861 DBG1(DBG_KNL, "unable to flush SPD entries");
2862 return FAILED;
2863 }
2864 else if (out->sadb_msg_errno)
2865 {
2866 DBG1(DBG_KNL, "unable to flush SPD entries: %s (%d)",
2867 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2868 free(out);
2869 return FAILED;
2870 }
2871 free(out);
2872 return SUCCESS;
2873 }
2874
2875 /**
2876 * Register a socket for ACQUIRE/EXPIRE messages
2877 */
2878 static status_t register_pfkey_socket(private_kernel_pfkey_ipsec_t *this,
2879 u_int8_t satype)
2880 {
2881 unsigned char request[PFKEY_BUFFER_SIZE];
2882 struct sadb_msg *msg, *out;
2883 size_t len;
2884
2885 memset(&request, 0, sizeof(request));
2886
2887 msg = (struct sadb_msg*)request;
2888 msg->sadb_msg_version = PF_KEY_V2;
2889 msg->sadb_msg_type = SADB_REGISTER;
2890 msg->sadb_msg_satype = satype;
2891 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2892
2893 if (pfkey_send_socket(this, this->socket_events, msg, &out, &len) != SUCCESS)
2894 {
2895 DBG1(DBG_KNL, "unable to register PF_KEY socket");
2896 return FAILED;
2897 }
2898 else if (out->sadb_msg_errno)
2899 {
2900 DBG1(DBG_KNL, "unable to register PF_KEY socket: %s (%d)",
2901 strerror(out->sadb