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[people/ms/strongswan.git] / src / libhydra / plugins / kernel_netlink / kernel_netlink_ipsec.c
1 /*
2 * Copyright (C) 2006-2012 Tobias Brunner
3 * Copyright (C) 2005-2009 Martin Willi
4 * Copyright (C) 2008 Andreas Steffen
5 * Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser
6 * Copyright (C) 2006 Daniel Roethlisberger
7 * Copyright (C) 2005 Jan Hutter
8 * Hochschule fuer Technik Rapperswil
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * for more details.
19 */
20
21 #include <sys/types.h>
22 #include <sys/socket.h>
23 #include <stdint.h>
24 #include <linux/ipsec.h>
25 #include <linux/netlink.h>
26 #include <linux/rtnetlink.h>
27 #include <linux/xfrm.h>
28 #include <linux/udp.h>
29 #include <unistd.h>
30 #include <time.h>
31 #include <errno.h>
32 #include <string.h>
33 #include <fcntl.h>
34
35 #include "kernel_netlink_ipsec.h"
36 #include "kernel_netlink_shared.h"
37
38 #include <hydra.h>
39 #include <utils/debug.h>
40 #include <threading/thread.h>
41 #include <threading/mutex.h>
42 #include <collections/hashtable.h>
43 #include <collections/linked_list.h>
44 #include <processing/jobs/callback_job.h>
45
46 /** Required for Linux 2.6.26 kernel and later */
47 #ifndef XFRM_STATE_AF_UNSPEC
48 #define XFRM_STATE_AF_UNSPEC 32
49 #endif
50
51 /** From linux/in.h */
52 #ifndef IP_XFRM_POLICY
53 #define IP_XFRM_POLICY 17
54 #endif
55
56 /** Missing on uclibc */
57 #ifndef IPV6_XFRM_POLICY
58 #define IPV6_XFRM_POLICY 34
59 #endif /*IPV6_XFRM_POLICY*/
60
61 /* from linux/udp.h */
62 #ifndef UDP_ENCAP
63 #define UDP_ENCAP 100
64 #endif
65
66 #ifndef UDP_ENCAP_ESPINUDP
67 #define UDP_ENCAP_ESPINUDP 2
68 #endif
69
70 /* this is not defined on some platforms */
71 #ifndef SOL_UDP
72 #define SOL_UDP IPPROTO_UDP
73 #endif
74
75 /** Default priority of installed policies */
76 #define PRIO_BASE 512
77
78 /** Default replay window size, if not set using charon.replay_window */
79 #define DEFAULT_REPLAY_WINDOW 32
80
81 /**
82 * Map the limit for bytes and packets to XFRM_INF by default
83 */
84 #define XFRM_LIMIT(x) ((x) == 0 ? XFRM_INF : (x))
85
86 /**
87 * Create ORable bitfield of XFRM NL groups
88 */
89 #define XFRMNLGRP(x) (1<<(XFRMNLGRP_##x-1))
90
91 /**
92 * Returns a pointer to the first rtattr following the nlmsghdr *nlh and the
93 * 'usual' netlink data x like 'struct xfrm_usersa_info'
94 */
95 #define XFRM_RTA(nlh, x) ((struct rtattr*)(NLMSG_DATA(nlh) + \
96 NLMSG_ALIGN(sizeof(x))))
97 /**
98 * Returns a pointer to the next rtattr following rta.
99 * !!! Do not use this to parse messages. Use RTA_NEXT and RTA_OK instead !!!
100 */
101 #define XFRM_RTA_NEXT(rta) ((struct rtattr*)(((char*)(rta)) + \
102 RTA_ALIGN((rta)->rta_len)))
103 /**
104 * Returns the total size of attached rta data
105 * (after 'usual' netlink data x like 'struct xfrm_usersa_info')
106 */
107 #define XFRM_PAYLOAD(nlh, x) NLMSG_PAYLOAD(nlh, sizeof(x))
108
109 typedef struct kernel_algorithm_t kernel_algorithm_t;
110
111 /**
112 * Mapping of IKEv2 kernel identifier to linux crypto API names
113 */
114 struct kernel_algorithm_t {
115 /**
116 * Identifier specified in IKEv2
117 */
118 int ikev2;
119
120 /**
121 * Name of the algorithm in linux crypto API
122 */
123 char *name;
124 };
125
126 ENUM(xfrm_msg_names, XFRM_MSG_NEWSA, XFRM_MSG_MAPPING,
127 "XFRM_MSG_NEWSA",
128 "XFRM_MSG_DELSA",
129 "XFRM_MSG_GETSA",
130 "XFRM_MSG_NEWPOLICY",
131 "XFRM_MSG_DELPOLICY",
132 "XFRM_MSG_GETPOLICY",
133 "XFRM_MSG_ALLOCSPI",
134 "XFRM_MSG_ACQUIRE",
135 "XFRM_MSG_EXPIRE",
136 "XFRM_MSG_UPDPOLICY",
137 "XFRM_MSG_UPDSA",
138 "XFRM_MSG_POLEXPIRE",
139 "XFRM_MSG_FLUSHSA",
140 "XFRM_MSG_FLUSHPOLICY",
141 "XFRM_MSG_NEWAE",
142 "XFRM_MSG_GETAE",
143 "XFRM_MSG_REPORT",
144 "XFRM_MSG_MIGRATE",
145 "XFRM_MSG_NEWSADINFO",
146 "XFRM_MSG_GETSADINFO",
147 "XFRM_MSG_NEWSPDINFO",
148 "XFRM_MSG_GETSPDINFO",
149 "XFRM_MSG_MAPPING"
150 );
151
152 ENUM(xfrm_attr_type_names, XFRMA_UNSPEC, XFRMA_REPLAY_ESN_VAL,
153 "XFRMA_UNSPEC",
154 "XFRMA_ALG_AUTH",
155 "XFRMA_ALG_CRYPT",
156 "XFRMA_ALG_COMP",
157 "XFRMA_ENCAP",
158 "XFRMA_TMPL",
159 "XFRMA_SA",
160 "XFRMA_POLICY",
161 "XFRMA_SEC_CTX",
162 "XFRMA_LTIME_VAL",
163 "XFRMA_REPLAY_VAL",
164 "XFRMA_REPLAY_THRESH",
165 "XFRMA_ETIMER_THRESH",
166 "XFRMA_SRCADDR",
167 "XFRMA_COADDR",
168 "XFRMA_LASTUSED",
169 "XFRMA_POLICY_TYPE",
170 "XFRMA_MIGRATE",
171 "XFRMA_ALG_AEAD",
172 "XFRMA_KMADDRESS",
173 "XFRMA_ALG_AUTH_TRUNC",
174 "XFRMA_MARK",
175 "XFRMA_TFCPAD",
176 "XFRMA_REPLAY_ESN_VAL",
177 );
178
179 #define END_OF_LIST -1
180
181 /**
182 * Algorithms for encryption
183 */
184 static kernel_algorithm_t encryption_algs[] = {
185 /* {ENCR_DES_IV64, "***" }, */
186 {ENCR_DES, "des" },
187 {ENCR_3DES, "des3_ede" },
188 /* {ENCR_RC5, "***" }, */
189 /* {ENCR_IDEA, "***" }, */
190 {ENCR_CAST, "cast128" },
191 {ENCR_BLOWFISH, "blowfish" },
192 /* {ENCR_3IDEA, "***" }, */
193 /* {ENCR_DES_IV32, "***" }, */
194 {ENCR_NULL, "cipher_null" },
195 {ENCR_AES_CBC, "aes" },
196 {ENCR_AES_CTR, "rfc3686(ctr(aes))" },
197 {ENCR_AES_CCM_ICV8, "rfc4309(ccm(aes))" },
198 {ENCR_AES_CCM_ICV12, "rfc4309(ccm(aes))" },
199 {ENCR_AES_CCM_ICV16, "rfc4309(ccm(aes))" },
200 {ENCR_AES_GCM_ICV8, "rfc4106(gcm(aes))" },
201 {ENCR_AES_GCM_ICV12, "rfc4106(gcm(aes))" },
202 {ENCR_AES_GCM_ICV16, "rfc4106(gcm(aes))" },
203 {ENCR_NULL_AUTH_AES_GMAC, "rfc4543(gcm(aes))" },
204 {ENCR_CAMELLIA_CBC, "cbc(camellia)" },
205 /* {ENCR_CAMELLIA_CTR, "***" }, */
206 /* {ENCR_CAMELLIA_CCM_ICV8, "***" }, */
207 /* {ENCR_CAMELLIA_CCM_ICV12, "***" }, */
208 /* {ENCR_CAMELLIA_CCM_ICV16, "***" }, */
209 {ENCR_SERPENT_CBC, "serpent" },
210 {ENCR_TWOFISH_CBC, "twofish" },
211 {END_OF_LIST, NULL }
212 };
213
214 /**
215 * Algorithms for integrity protection
216 */
217 static kernel_algorithm_t integrity_algs[] = {
218 {AUTH_HMAC_MD5_96, "md5" },
219 {AUTH_HMAC_MD5_128, "hmac(md5)" },
220 {AUTH_HMAC_SHA1_96, "sha1" },
221 {AUTH_HMAC_SHA1_160, "hmac(sha1)" },
222 {AUTH_HMAC_SHA2_256_96, "sha256" },
223 {AUTH_HMAC_SHA2_256_128, "hmac(sha256)" },
224 {AUTH_HMAC_SHA2_384_192, "hmac(sha384)" },
225 {AUTH_HMAC_SHA2_512_256, "hmac(sha512)" },
226 /* {AUTH_DES_MAC, "***" }, */
227 /* {AUTH_KPDK_MD5, "***" }, */
228 {AUTH_AES_XCBC_96, "xcbc(aes)" },
229 {END_OF_LIST, NULL }
230 };
231
232 /**
233 * Algorithms for IPComp
234 */
235 static kernel_algorithm_t compression_algs[] = {
236 /* {IPCOMP_OUI, "***" }, */
237 {IPCOMP_DEFLATE, "deflate" },
238 {IPCOMP_LZS, "lzs" },
239 {IPCOMP_LZJH, "lzjh" },
240 {END_OF_LIST, NULL }
241 };
242
243 /**
244 * Look up a kernel algorithm name and its key size
245 */
246 static char* lookup_algorithm(transform_type_t type, int ikev2)
247 {
248 kernel_algorithm_t *list;
249 char *name = NULL;
250
251 switch (type)
252 {
253 case ENCRYPTION_ALGORITHM:
254 list = encryption_algs;
255 break;
256 case INTEGRITY_ALGORITHM:
257 list = integrity_algs;
258 break;
259 case COMPRESSION_ALGORITHM:
260 list = compression_algs;
261 break;
262 default:
263 return NULL;
264 }
265 while (list->ikev2 != END_OF_LIST)
266 {
267 if (list->ikev2 == ikev2)
268 {
269 return list->name;
270 }
271 list++;
272 }
273 hydra->kernel_interface->lookup_algorithm(hydra->kernel_interface, ikev2,
274 type, NULL, &name);
275 return name;
276 }
277
278 typedef struct private_kernel_netlink_ipsec_t private_kernel_netlink_ipsec_t;
279
280 /**
281 * Private variables and functions of kernel_netlink class.
282 */
283 struct private_kernel_netlink_ipsec_t {
284 /**
285 * Public part of the kernel_netlink_t object
286 */
287 kernel_netlink_ipsec_t public;
288
289 /**
290 * Mutex to lock access to installed policies
291 */
292 mutex_t *mutex;
293
294 /**
295 * Hash table of installed policies (policy_entry_t)
296 */
297 hashtable_t *policies;
298
299 /**
300 * Hash table of IPsec SAs using policies (ipsec_sa_t)
301 */
302 hashtable_t *sas;
303
304 /**
305 * Netlink xfrm socket (IPsec)
306 */
307 netlink_socket_t *socket_xfrm;
308
309 /**
310 * Netlink xfrm socket to receive acquire and expire events
311 */
312 int socket_xfrm_events;
313
314 /**
315 * Whether to install routes along policies
316 */
317 bool install_routes;
318
319 /**
320 * Whether to track the history of a policy
321 */
322 bool policy_history;
323
324 /**
325 * Size of the replay window, in packets (= bits)
326 */
327 u_int32_t replay_window;
328
329 /**
330 * Size of the replay window bitmap, in number of __u32 blocks
331 */
332 u_int32_t replay_bmp;
333 };
334
335 typedef struct route_entry_t route_entry_t;
336
337 /**
338 * Installed routing entry
339 */
340 struct route_entry_t {
341 /** Name of the interface the route is bound to */
342 char *if_name;
343
344 /** Source ip of the route */
345 host_t *src_ip;
346
347 /** Gateway for this route */
348 host_t *gateway;
349
350 /** Destination net */
351 chunk_t dst_net;
352
353 /** Destination net prefixlen */
354 u_int8_t prefixlen;
355 };
356
357 /**
358 * Destroy a route_entry_t object
359 */
360 static void route_entry_destroy(route_entry_t *this)
361 {
362 free(this->if_name);
363 this->src_ip->destroy(this->src_ip);
364 DESTROY_IF(this->gateway);
365 chunk_free(&this->dst_net);
366 free(this);
367 }
368
369 /**
370 * Compare two route_entry_t objects
371 */
372 static bool route_entry_equals(route_entry_t *a, route_entry_t *b)
373 {
374 return a->if_name && b->if_name && streq(a->if_name, b->if_name) &&
375 a->src_ip->ip_equals(a->src_ip, b->src_ip) &&
376 a->gateway->ip_equals(a->gateway, b->gateway) &&
377 chunk_equals(a->dst_net, b->dst_net) && a->prefixlen == b->prefixlen;
378 }
379
380 typedef struct ipsec_sa_t ipsec_sa_t;
381
382 /**
383 * IPsec SA assigned to a policy.
384 */
385 struct ipsec_sa_t {
386 /** Source address of this SA */
387 host_t *src;
388
389 /** Destination address of this SA */
390 host_t *dst;
391
392 /** Optional mark */
393 mark_t mark;
394
395 /** Description of this SA */
396 ipsec_sa_cfg_t cfg;
397
398 /** Reference count for this SA */
399 refcount_t refcount;
400 };
401
402 /**
403 * Hash function for ipsec_sa_t objects
404 */
405 static u_int ipsec_sa_hash(ipsec_sa_t *sa)
406 {
407 return chunk_hash_inc(sa->src->get_address(sa->src),
408 chunk_hash_inc(sa->dst->get_address(sa->dst),
409 chunk_hash_inc(chunk_from_thing(sa->mark),
410 chunk_hash(chunk_from_thing(sa->cfg)))));
411 }
412
413 /**
414 * Equality function for ipsec_sa_t objects
415 */
416 static bool ipsec_sa_equals(ipsec_sa_t *sa, ipsec_sa_t *other_sa)
417 {
418 return sa->src->ip_equals(sa->src, other_sa->src) &&
419 sa->dst->ip_equals(sa->dst, other_sa->dst) &&
420 memeq(&sa->mark, &other_sa->mark, sizeof(mark_t)) &&
421 memeq(&sa->cfg, &other_sa->cfg, sizeof(ipsec_sa_cfg_t));
422 }
423
424 /**
425 * Allocate or reference an IPsec SA object
426 */
427 static ipsec_sa_t *ipsec_sa_create(private_kernel_netlink_ipsec_t *this,
428 host_t *src, host_t *dst, mark_t mark,
429 ipsec_sa_cfg_t *cfg)
430 {
431 ipsec_sa_t *sa, *found;
432 INIT(sa,
433 .src = src,
434 .dst = dst,
435 .mark = mark,
436 .cfg = *cfg,
437 );
438 found = this->sas->get(this->sas, sa);
439 if (!found)
440 {
441 sa->src = src->clone(src);
442 sa->dst = dst->clone(dst);
443 this->sas->put(this->sas, sa, sa);
444 }
445 else
446 {
447 free(sa);
448 sa = found;
449 }
450 ref_get(&sa->refcount);
451 return sa;
452 }
453
454 /**
455 * Release and destroy an IPsec SA object
456 */
457 static void ipsec_sa_destroy(private_kernel_netlink_ipsec_t *this,
458 ipsec_sa_t *sa)
459 {
460 if (ref_put(&sa->refcount))
461 {
462 this->sas->remove(this->sas, sa);
463 DESTROY_IF(sa->src);
464 DESTROY_IF(sa->dst);
465 free(sa);
466 }
467 }
468
469 typedef struct policy_sa_t policy_sa_t;
470 typedef struct policy_sa_fwd_t policy_sa_fwd_t;
471
472 /**
473 * Mapping between a policy and an IPsec SA.
474 */
475 struct policy_sa_t {
476 /** Priority assigned to the policy when installed with this SA */
477 u_int32_t priority;
478
479 /** Type of the policy */
480 policy_type_t type;
481
482 /** Assigned SA */
483 ipsec_sa_t *sa;
484 };
485
486 /**
487 * For forward policies we also cache the traffic selectors in order to install
488 * the route.
489 */
490 struct policy_sa_fwd_t {
491 /** Generic interface */
492 policy_sa_t generic;
493
494 /** Source traffic selector of this policy */
495 traffic_selector_t *src_ts;
496
497 /** Destination traffic selector of this policy */
498 traffic_selector_t *dst_ts;
499 };
500
501 /**
502 * Create a policy_sa(_fwd)_t object
503 */
504 static policy_sa_t *policy_sa_create(private_kernel_netlink_ipsec_t *this,
505 policy_dir_t dir, policy_type_t type, host_t *src, host_t *dst,
506 traffic_selector_t *src_ts, traffic_selector_t *dst_ts, mark_t mark,
507 ipsec_sa_cfg_t *cfg)
508 {
509 policy_sa_t *policy;
510
511 if (dir == POLICY_FWD)
512 {
513 policy_sa_fwd_t *fwd;
514 INIT(fwd,
515 .src_ts = src_ts->clone(src_ts),
516 .dst_ts = dst_ts->clone(dst_ts),
517 );
518 policy = &fwd->generic;
519 }
520 else
521 {
522 INIT(policy, .priority = 0);
523 }
524 policy->type = type;
525 policy->sa = ipsec_sa_create(this, src, dst, mark, cfg);
526 return policy;
527 }
528
529 /**
530 * Destroy a policy_sa(_fwd)_t object
531 */
532 static void policy_sa_destroy(policy_sa_t *policy, policy_dir_t *dir,
533 private_kernel_netlink_ipsec_t *this)
534 {
535 if (*dir == POLICY_FWD)
536 {
537 policy_sa_fwd_t *fwd = (policy_sa_fwd_t*)policy;
538 fwd->src_ts->destroy(fwd->src_ts);
539 fwd->dst_ts->destroy(fwd->dst_ts);
540 }
541 ipsec_sa_destroy(this, policy->sa);
542 free(policy);
543 }
544
545 typedef struct policy_entry_t policy_entry_t;
546
547 /**
548 * Installed kernel policy.
549 */
550 struct policy_entry_t {
551
552 /** Direction of this policy: in, out, forward */
553 u_int8_t direction;
554
555 /** Parameters of installed policy */
556 struct xfrm_selector sel;
557
558 /** Optional mark */
559 u_int32_t mark;
560
561 /** Associated route installed for this policy */
562 route_entry_t *route;
563
564 /** List of SAs this policy is used by, ordered by priority */
565 linked_list_t *used_by;
566 };
567
568 /**
569 * Destroy a policy_entry_t object
570 */
571 static void policy_entry_destroy(private_kernel_netlink_ipsec_t *this,
572 policy_entry_t *policy)
573 {
574 if (policy->route)
575 {
576 route_entry_destroy(policy->route);
577 }
578 if (policy->used_by)
579 {
580 policy->used_by->invoke_function(policy->used_by,
581 (linked_list_invoke_t)policy_sa_destroy,
582 &policy->direction, this);
583 policy->used_by->destroy(policy->used_by);
584 }
585 free(policy);
586 }
587
588 /**
589 * Hash function for policy_entry_t objects
590 */
591 static u_int policy_hash(policy_entry_t *key)
592 {
593 chunk_t chunk = chunk_from_thing(key->sel);
594 return chunk_hash_inc(chunk, chunk_hash(chunk_from_thing(key->mark)));
595 }
596
597 /**
598 * Equality function for policy_entry_t objects
599 */
600 static bool policy_equals(policy_entry_t *key, policy_entry_t *other_key)
601 {
602 return memeq(&key->sel, &other_key->sel, sizeof(struct xfrm_selector)) &&
603 key->mark == other_key->mark &&
604 key->direction == other_key->direction;
605 }
606
607 /**
608 * Calculate the priority of a policy
609 */
610 static inline u_int32_t get_priority(policy_entry_t *policy,
611 policy_priority_t prio)
612 {
613 u_int32_t priority = PRIO_BASE;
614 switch (prio)
615 {
616 case POLICY_PRIORITY_FALLBACK:
617 priority <<= 1;
618 /* fall-through */
619 case POLICY_PRIORITY_ROUTED:
620 priority <<= 1;
621 /* fall-through */
622 case POLICY_PRIORITY_DEFAULT:
623 break;
624 }
625 /* calculate priority based on selector size, small size = high prio */
626 priority -= policy->sel.prefixlen_s;
627 priority -= policy->sel.prefixlen_d;
628 priority <<= 2; /* make some room for the two flags */
629 priority += policy->sel.sport_mask || policy->sel.dport_mask ? 0 : 2;
630 priority += policy->sel.proto ? 0 : 1;
631 return priority;
632 }
633
634 /**
635 * Convert the general ipsec mode to the one defined in xfrm.h
636 */
637 static u_int8_t mode2kernel(ipsec_mode_t mode)
638 {
639 switch (mode)
640 {
641 case MODE_TRANSPORT:
642 return XFRM_MODE_TRANSPORT;
643 case MODE_TUNNEL:
644 return XFRM_MODE_TUNNEL;
645 case MODE_BEET:
646 return XFRM_MODE_BEET;
647 default:
648 return mode;
649 }
650 }
651
652 /**
653 * Convert a host_t to a struct xfrm_address
654 */
655 static void host2xfrm(host_t *host, xfrm_address_t *xfrm)
656 {
657 chunk_t chunk = host->get_address(host);
658 memcpy(xfrm, chunk.ptr, min(chunk.len, sizeof(xfrm_address_t)));
659 }
660
661 /**
662 * Convert a struct xfrm_address to a host_t
663 */
664 static host_t* xfrm2host(int family, xfrm_address_t *xfrm, u_int16_t port)
665 {
666 chunk_t chunk;
667
668 switch (family)
669 {
670 case AF_INET:
671 chunk = chunk_create((u_char*)&xfrm->a4, sizeof(xfrm->a4));
672 break;
673 case AF_INET6:
674 chunk = chunk_create((u_char*)&xfrm->a6, sizeof(xfrm->a6));
675 break;
676 default:
677 return NULL;
678 }
679 return host_create_from_chunk(family, chunk, ntohs(port));
680 }
681
682 /**
683 * Convert a traffic selector address range to subnet and its mask.
684 */
685 static void ts2subnet(traffic_selector_t* ts,
686 xfrm_address_t *net, u_int8_t *mask)
687 {
688 host_t *net_host;
689 chunk_t net_chunk;
690
691 ts->to_subnet(ts, &net_host, mask);
692 net_chunk = net_host->get_address(net_host);
693 memcpy(net, net_chunk.ptr, net_chunk.len);
694 net_host->destroy(net_host);
695 }
696
697 /**
698 * Convert a traffic selector port range to port/portmask
699 */
700 static void ts2ports(traffic_selector_t* ts,
701 u_int16_t *port, u_int16_t *mask)
702 {
703 /* Linux does not seem to accept complex portmasks. Only
704 * any or a specific port is allowed. We set to any, if we have
705 * a port range, or to a specific, if we have one port only.
706 */
707 u_int16_t from, to;
708
709 from = ts->get_from_port(ts);
710 to = ts->get_to_port(ts);
711
712 if (from == to)
713 {
714 *port = htons(from);
715 *mask = ~0;
716 }
717 else
718 {
719 *port = 0;
720 *mask = 0;
721 }
722 }
723
724 /**
725 * Convert a pair of traffic_selectors to an xfrm_selector
726 */
727 static struct xfrm_selector ts2selector(traffic_selector_t *src,
728 traffic_selector_t *dst)
729 {
730 struct xfrm_selector sel;
731
732 memset(&sel, 0, sizeof(sel));
733 sel.family = (src->get_type(src) == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
734 /* src or dest proto may be "any" (0), use more restrictive one */
735 sel.proto = max(src->get_protocol(src), dst->get_protocol(dst));
736 ts2subnet(dst, &sel.daddr, &sel.prefixlen_d);
737 ts2subnet(src, &sel.saddr, &sel.prefixlen_s);
738 ts2ports(dst, &sel.dport, &sel.dport_mask);
739 ts2ports(src, &sel.sport, &sel.sport_mask);
740 sel.ifindex = 0;
741 sel.user = 0;
742
743 return sel;
744 }
745
746 /**
747 * Convert an xfrm_selector to a src|dst traffic_selector
748 */
749 static traffic_selector_t* selector2ts(struct xfrm_selector *sel, bool src)
750 {
751 u_char *addr;
752 u_int8_t prefixlen;
753 u_int16_t port = 0;
754 host_t *host = NULL;
755
756 if (src)
757 {
758 addr = (u_char*)&sel->saddr;
759 prefixlen = sel->prefixlen_s;
760 if (sel->sport_mask)
761 {
762 port = htons(sel->sport);
763 }
764 }
765 else
766 {
767 addr = (u_char*)&sel->daddr;
768 prefixlen = sel->prefixlen_d;
769 if (sel->dport_mask)
770 {
771 port = htons(sel->dport);
772 }
773 }
774
775 /* The Linux 2.6 kernel does not set the selector's family field,
776 * so as a kludge we additionally test the prefix length.
777 */
778 if (sel->family == AF_INET || sel->prefixlen_s == 32)
779 {
780 host = host_create_from_chunk(AF_INET, chunk_create(addr, 4), 0);
781 }
782 else if (sel->family == AF_INET6 || sel->prefixlen_s == 128)
783 {
784 host = host_create_from_chunk(AF_INET6, chunk_create(addr, 16), 0);
785 }
786
787 if (host)
788 {
789 return traffic_selector_create_from_subnet(host, prefixlen,
790 sel->proto, port, port ?: 65535);
791 }
792 return NULL;
793 }
794
795 /**
796 * Process a XFRM_MSG_ACQUIRE from kernel
797 */
798 static void process_acquire(private_kernel_netlink_ipsec_t *this,
799 struct nlmsghdr *hdr)
800 {
801 struct xfrm_user_acquire *acquire;
802 struct rtattr *rta;
803 size_t rtasize;
804 traffic_selector_t *src_ts, *dst_ts;
805 u_int32_t reqid = 0;
806 int proto = 0;
807
808 acquire = (struct xfrm_user_acquire*)NLMSG_DATA(hdr);
809 rta = XFRM_RTA(hdr, struct xfrm_user_acquire);
810 rtasize = XFRM_PAYLOAD(hdr, struct xfrm_user_acquire);
811
812 DBG2(DBG_KNL, "received a XFRM_MSG_ACQUIRE");
813
814 while (RTA_OK(rta, rtasize))
815 {
816 DBG2(DBG_KNL, " %N", xfrm_attr_type_names, rta->rta_type);
817
818 if (rta->rta_type == XFRMA_TMPL)
819 {
820 struct xfrm_user_tmpl* tmpl;
821 tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rta);
822 reqid = tmpl->reqid;
823 proto = tmpl->id.proto;
824 }
825 rta = RTA_NEXT(rta, rtasize);
826 }
827 switch (proto)
828 {
829 case 0:
830 case IPPROTO_ESP:
831 case IPPROTO_AH:
832 break;
833 default:
834 /* acquire for AH/ESP only, not for IPCOMP */
835 return;
836 }
837 src_ts = selector2ts(&acquire->sel, TRUE);
838 dst_ts = selector2ts(&acquire->sel, FALSE);
839
840 hydra->kernel_interface->acquire(hydra->kernel_interface, reqid, src_ts,
841 dst_ts);
842 }
843
844 /**
845 * Process a XFRM_MSG_EXPIRE from kernel
846 */
847 static void process_expire(private_kernel_netlink_ipsec_t *this,
848 struct nlmsghdr *hdr)
849 {
850 struct xfrm_user_expire *expire;
851 u_int32_t spi, reqid;
852 u_int8_t protocol;
853
854 expire = (struct xfrm_user_expire*)NLMSG_DATA(hdr);
855 protocol = expire->state.id.proto;
856 spi = expire->state.id.spi;
857 reqid = expire->state.reqid;
858
859 DBG2(DBG_KNL, "received a XFRM_MSG_EXPIRE");
860
861 if (protocol != IPPROTO_ESP && protocol != IPPROTO_AH)
862 {
863 DBG2(DBG_KNL, "ignoring XFRM_MSG_EXPIRE for SA with SPI %.8x and "
864 "reqid {%u} which is not a CHILD_SA", ntohl(spi), reqid);
865 return;
866 }
867
868 hydra->kernel_interface->expire(hydra->kernel_interface, reqid, protocol,
869 spi, expire->hard != 0);
870 }
871
872 /**
873 * Process a XFRM_MSG_MIGRATE from kernel
874 */
875 static void process_migrate(private_kernel_netlink_ipsec_t *this,
876 struct nlmsghdr *hdr)
877 {
878 struct xfrm_userpolicy_id *policy_id;
879 struct rtattr *rta;
880 size_t rtasize;
881 traffic_selector_t *src_ts, *dst_ts;
882 host_t *local = NULL, *remote = NULL;
883 host_t *old_src = NULL, *old_dst = NULL;
884 host_t *new_src = NULL, *new_dst = NULL;
885 u_int32_t reqid = 0;
886 policy_dir_t dir;
887
888 policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
889 rta = XFRM_RTA(hdr, struct xfrm_userpolicy_id);
890 rtasize = XFRM_PAYLOAD(hdr, struct xfrm_userpolicy_id);
891
892 DBG2(DBG_KNL, "received a XFRM_MSG_MIGRATE");
893
894 src_ts = selector2ts(&policy_id->sel, TRUE);
895 dst_ts = selector2ts(&policy_id->sel, FALSE);
896 dir = (policy_dir_t)policy_id->dir;
897
898 DBG2(DBG_KNL, " policy: %R === %R %N", src_ts, dst_ts, policy_dir_names);
899
900 while (RTA_OK(rta, rtasize))
901 {
902 DBG2(DBG_KNL, " %N", xfrm_attr_type_names, rta->rta_type);
903 if (rta->rta_type == XFRMA_KMADDRESS)
904 {
905 struct xfrm_user_kmaddress *kmaddress;
906
907 kmaddress = (struct xfrm_user_kmaddress*)RTA_DATA(rta);
908 local = xfrm2host(kmaddress->family, &kmaddress->local, 0);
909 remote = xfrm2host(kmaddress->family, &kmaddress->remote, 0);
910 DBG2(DBG_KNL, " kmaddress: %H...%H", local, remote);
911 }
912 else if (rta->rta_type == XFRMA_MIGRATE)
913 {
914 struct xfrm_user_migrate *migrate;
915
916 migrate = (struct xfrm_user_migrate*)RTA_DATA(rta);
917 old_src = xfrm2host(migrate->old_family, &migrate->old_saddr, 0);
918 old_dst = xfrm2host(migrate->old_family, &migrate->old_daddr, 0);
919 new_src = xfrm2host(migrate->new_family, &migrate->new_saddr, 0);
920 new_dst = xfrm2host(migrate->new_family, &migrate->new_daddr, 0);
921 reqid = migrate->reqid;
922 DBG2(DBG_KNL, " migrate %H...%H to %H...%H, reqid {%u}",
923 old_src, old_dst, new_src, new_dst, reqid);
924 DESTROY_IF(old_src);
925 DESTROY_IF(old_dst);
926 DESTROY_IF(new_src);
927 DESTROY_IF(new_dst);
928 }
929 rta = RTA_NEXT(rta, rtasize);
930 }
931
932 if (src_ts && dst_ts && local && remote)
933 {
934 hydra->kernel_interface->migrate(hydra->kernel_interface, reqid,
935 src_ts, dst_ts, dir, local, remote);
936 }
937 else
938 {
939 DESTROY_IF(src_ts);
940 DESTROY_IF(dst_ts);
941 DESTROY_IF(local);
942 DESTROY_IF(remote);
943 }
944 }
945
946 /**
947 * Process a XFRM_MSG_MAPPING from kernel
948 */
949 static void process_mapping(private_kernel_netlink_ipsec_t *this,
950 struct nlmsghdr *hdr)
951 {
952 struct xfrm_user_mapping *mapping;
953 u_int32_t spi, reqid;
954
955 mapping = (struct xfrm_user_mapping*)NLMSG_DATA(hdr);
956 spi = mapping->id.spi;
957 reqid = mapping->reqid;
958
959 DBG2(DBG_KNL, "received a XFRM_MSG_MAPPING");
960
961 if (mapping->id.proto == IPPROTO_ESP)
962 {
963 host_t *host;
964 host = xfrm2host(mapping->id.family, &mapping->new_saddr,
965 mapping->new_sport);
966 if (host)
967 {
968 hydra->kernel_interface->mapping(hydra->kernel_interface, reqid,
969 spi, host);
970 }
971 }
972 }
973
974 /**
975 * Receives events from kernel
976 */
977 static job_requeue_t receive_events(private_kernel_netlink_ipsec_t *this)
978 {
979 char response[1024];
980 struct nlmsghdr *hdr = (struct nlmsghdr*)response;
981 struct sockaddr_nl addr;
982 socklen_t addr_len = sizeof(addr);
983 int len;
984 bool oldstate;
985
986 oldstate = thread_cancelability(TRUE);
987 len = recvfrom(this->socket_xfrm_events, response, sizeof(response), 0,
988 (struct sockaddr*)&addr, &addr_len);
989 thread_cancelability(oldstate);
990
991 if (len < 0)
992 {
993 switch (errno)
994 {
995 case EINTR:
996 /* interrupted, try again */
997 return JOB_REQUEUE_DIRECT;
998 case EAGAIN:
999 /* no data ready, select again */
1000 return JOB_REQUEUE_DIRECT;
1001 default:
1002 DBG1(DBG_KNL, "unable to receive from xfrm event socket");
1003 sleep(1);
1004 return JOB_REQUEUE_FAIR;
1005 }
1006 }
1007
1008 if (addr.nl_pid != 0)
1009 { /* not from kernel. not interested, try another one */
1010 return JOB_REQUEUE_DIRECT;
1011 }
1012
1013 while (NLMSG_OK(hdr, len))
1014 {
1015 switch (hdr->nlmsg_type)
1016 {
1017 case XFRM_MSG_ACQUIRE:
1018 process_acquire(this, hdr);
1019 break;
1020 case XFRM_MSG_EXPIRE:
1021 process_expire(this, hdr);
1022 break;
1023 case XFRM_MSG_MIGRATE:
1024 process_migrate(this, hdr);
1025 break;
1026 case XFRM_MSG_MAPPING:
1027 process_mapping(this, hdr);
1028 break;
1029 default:
1030 DBG1(DBG_KNL, "received unknown event from xfrm event "
1031 "socket: %d", hdr->nlmsg_type);
1032 break;
1033 }
1034 hdr = NLMSG_NEXT(hdr, len);
1035 }
1036 return JOB_REQUEUE_DIRECT;
1037 }
1038
1039 METHOD(kernel_ipsec_t, get_features, kernel_feature_t,
1040 private_kernel_netlink_ipsec_t *this)
1041 {
1042 return KERNEL_ESP_V3_TFC;
1043 }
1044
1045 /**
1046 * Get an SPI for a specific protocol from the kernel.
1047 */
1048 static status_t get_spi_internal(private_kernel_netlink_ipsec_t *this,
1049 host_t *src, host_t *dst, u_int8_t proto, u_int32_t min, u_int32_t max,
1050 u_int32_t reqid, u_int32_t *spi)
1051 {
1052 netlink_buf_t request;
1053 struct nlmsghdr *hdr, *out;
1054 struct xfrm_userspi_info *userspi;
1055 u_int32_t received_spi = 0;
1056 size_t len;
1057
1058 memset(&request, 0, sizeof(request));
1059
1060 hdr = (struct nlmsghdr*)request;
1061 hdr->nlmsg_flags = NLM_F_REQUEST;
1062 hdr->nlmsg_type = XFRM_MSG_ALLOCSPI;
1063 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userspi_info));
1064
1065 userspi = (struct xfrm_userspi_info*)NLMSG_DATA(hdr);
1066 host2xfrm(src, &userspi->info.saddr);
1067 host2xfrm(dst, &userspi->info.id.daddr);
1068 userspi->info.id.proto = proto;
1069 userspi->info.mode = XFRM_MODE_TUNNEL;
1070 userspi->info.reqid = reqid;
1071 userspi->info.family = src->get_family(src);
1072 userspi->min = min;
1073 userspi->max = max;
1074
1075 if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
1076 {
1077 hdr = out;
1078 while (NLMSG_OK(hdr, len))
1079 {
1080 switch (hdr->nlmsg_type)
1081 {
1082 case XFRM_MSG_NEWSA:
1083 {
1084 struct xfrm_usersa_info* usersa = NLMSG_DATA(hdr);
1085 received_spi = usersa->id.spi;
1086 break;
1087 }
1088 case NLMSG_ERROR:
1089 {
1090 struct nlmsgerr *err = NLMSG_DATA(hdr);
1091 DBG1(DBG_KNL, "allocating SPI failed: %s (%d)",
1092 strerror(-err->error), -err->error);
1093 break;
1094 }
1095 default:
1096 hdr = NLMSG_NEXT(hdr, len);
1097 continue;
1098 case NLMSG_DONE:
1099 break;
1100 }
1101 break;
1102 }
1103 free(out);
1104 }
1105
1106 if (received_spi == 0)
1107 {
1108 return FAILED;
1109 }
1110
1111 *spi = received_spi;
1112 return SUCCESS;
1113 }
1114
1115 METHOD(kernel_ipsec_t, get_spi, status_t,
1116 private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
1117 u_int8_t protocol, u_int32_t reqid, u_int32_t *spi)
1118 {
1119 DBG2(DBG_KNL, "getting SPI for reqid {%u}", reqid);
1120
1121 if (get_spi_internal(this, src, dst, protocol,
1122 0xc0000000, 0xcFFFFFFF, reqid, spi) != SUCCESS)
1123 {
1124 DBG1(DBG_KNL, "unable to get SPI for reqid {%u}", reqid);
1125 return FAILED;
1126 }
1127
1128 DBG2(DBG_KNL, "got SPI %.8x for reqid {%u}", ntohl(*spi), reqid);
1129 return SUCCESS;
1130 }
1131
1132 METHOD(kernel_ipsec_t, get_cpi, status_t,
1133 private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
1134 u_int32_t reqid, u_int16_t *cpi)
1135 {
1136 u_int32_t received_spi = 0;
1137
1138 DBG2(DBG_KNL, "getting CPI for reqid {%u}", reqid);
1139
1140 if (get_spi_internal(this, src, dst, IPPROTO_COMP,
1141 0x100, 0xEFFF, reqid, &received_spi) != SUCCESS)
1142 {
1143 DBG1(DBG_KNL, "unable to get CPI for reqid {%u}", reqid);
1144 return FAILED;
1145 }
1146
1147 *cpi = htons((u_int16_t)ntohl(received_spi));
1148
1149 DBG2(DBG_KNL, "got CPI %.4x for reqid {%u}", ntohs(*cpi), reqid);
1150 return SUCCESS;
1151 }
1152
1153 METHOD(kernel_ipsec_t, add_sa, status_t,
1154 private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
1155 u_int32_t spi, u_int8_t protocol, u_int32_t reqid, mark_t mark,
1156 u_int32_t tfc, lifetime_cfg_t *lifetime, u_int16_t enc_alg, chunk_t enc_key,
1157 u_int16_t int_alg, chunk_t int_key, ipsec_mode_t mode, u_int16_t ipcomp,
1158 u_int16_t cpi, bool encap, bool esn, bool inbound,
1159 traffic_selector_t* src_ts, traffic_selector_t* dst_ts)
1160 {
1161 netlink_buf_t request;
1162 char *alg_name;
1163 struct nlmsghdr *hdr;
1164 struct xfrm_usersa_info *sa;
1165 u_int16_t icv_size = 64;
1166 status_t status = FAILED;
1167
1168 /* if IPComp is used, we install an additional IPComp SA. if the cpi is 0
1169 * we are in the recursive call below */
1170 if (ipcomp != IPCOMP_NONE && cpi != 0)
1171 {
1172 lifetime_cfg_t lft = {{0,0,0},{0,0,0},{0,0,0}};
1173 add_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, reqid, mark,
1174 tfc, &lft, ENCR_UNDEFINED, chunk_empty, AUTH_UNDEFINED,
1175 chunk_empty, mode, ipcomp, 0, FALSE, FALSE, inbound, NULL, NULL);
1176 ipcomp = IPCOMP_NONE;
1177 /* use transport mode ESP SA, IPComp uses tunnel mode */
1178 mode = MODE_TRANSPORT;
1179 }
1180
1181 memset(&request, 0, sizeof(request));
1182
1183 DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u} (mark "
1184 "%u/0x%08x)", ntohl(spi), reqid, mark.value, mark.mask);
1185
1186 hdr = (struct nlmsghdr*)request;
1187 hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
1188 hdr->nlmsg_type = inbound ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA;
1189 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
1190
1191 sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr);
1192 host2xfrm(src, &sa->saddr);
1193 host2xfrm(dst, &sa->id.daddr);
1194 sa->id.spi = spi;
1195 sa->id.proto = protocol;
1196 sa->family = src->get_family(src);
1197 sa->mode = mode2kernel(mode);
1198 switch (mode)
1199 {
1200 case MODE_TUNNEL:
1201 sa->flags |= XFRM_STATE_AF_UNSPEC;
1202 break;
1203 case MODE_BEET:
1204 case MODE_TRANSPORT:
1205 if(src_ts && dst_ts)
1206 {
1207 sa->sel = ts2selector(src_ts, dst_ts);
1208 }
1209 break;
1210 default:
1211 break;
1212 }
1213
1214 sa->reqid = reqid;
1215 sa->lft.soft_byte_limit = XFRM_LIMIT(lifetime->bytes.rekey);
1216 sa->lft.hard_byte_limit = XFRM_LIMIT(lifetime->bytes.life);
1217 sa->lft.soft_packet_limit = XFRM_LIMIT(lifetime->packets.rekey);
1218 sa->lft.hard_packet_limit = XFRM_LIMIT(lifetime->packets.life);
1219 /* we use lifetimes since added, not since used */
1220 sa->lft.soft_add_expires_seconds = lifetime->time.rekey;
1221 sa->lft.hard_add_expires_seconds = lifetime->time.life;
1222 sa->lft.soft_use_expires_seconds = 0;
1223 sa->lft.hard_use_expires_seconds = 0;
1224
1225 struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_info);
1226
1227 switch (enc_alg)
1228 {
1229 case ENCR_UNDEFINED:
1230 /* no encryption */
1231 break;
1232 case ENCR_AES_CCM_ICV16:
1233 case ENCR_AES_GCM_ICV16:
1234 case ENCR_NULL_AUTH_AES_GMAC:
1235 case ENCR_CAMELLIA_CCM_ICV16:
1236 icv_size += 32;
1237 /* FALL */
1238 case ENCR_AES_CCM_ICV12:
1239 case ENCR_AES_GCM_ICV12:
1240 case ENCR_CAMELLIA_CCM_ICV12:
1241 icv_size += 32;
1242 /* FALL */
1243 case ENCR_AES_CCM_ICV8:
1244 case ENCR_AES_GCM_ICV8:
1245 case ENCR_CAMELLIA_CCM_ICV8:
1246 {
1247 struct xfrm_algo_aead *algo;
1248
1249 alg_name = lookup_algorithm(ENCRYPTION_ALGORITHM, enc_alg);
1250 if (alg_name == NULL)
1251 {
1252 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1253 encryption_algorithm_names, enc_alg);
1254 goto failed;
1255 }
1256 DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
1257 encryption_algorithm_names, enc_alg, enc_key.len * 8);
1258
1259 rthdr->rta_type = XFRMA_ALG_AEAD;
1260 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_aead) +
1261 enc_key.len);
1262 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1263 if (hdr->nlmsg_len > sizeof(request))
1264 {
1265 goto failed;
1266 }
1267
1268 algo = (struct xfrm_algo_aead*)RTA_DATA(rthdr);
1269 algo->alg_key_len = enc_key.len * 8;
1270 algo->alg_icv_len = icv_size;
1271 strncpy(algo->alg_name, alg_name, sizeof(algo->alg_name));
1272 algo->alg_name[sizeof(algo->alg_name) - 1] = '\0';
1273 memcpy(algo->alg_key, enc_key.ptr, enc_key.len);
1274
1275 rthdr = XFRM_RTA_NEXT(rthdr);
1276 break;
1277 }
1278 default:
1279 {
1280 struct xfrm_algo *algo;
1281
1282 alg_name = lookup_algorithm(ENCRYPTION_ALGORITHM, enc_alg);
1283 if (alg_name == NULL)
1284 {
1285 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1286 encryption_algorithm_names, enc_alg);
1287 goto failed;
1288 }
1289 DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
1290 encryption_algorithm_names, enc_alg, enc_key.len * 8);
1291
1292 rthdr->rta_type = XFRMA_ALG_CRYPT;
1293 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + enc_key.len);
1294 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1295 if (hdr->nlmsg_len > sizeof(request))
1296 {
1297 goto failed;
1298 }
1299
1300 algo = (struct xfrm_algo*)RTA_DATA(rthdr);
1301 algo->alg_key_len = enc_key.len * 8;
1302 strncpy(algo->alg_name, alg_name, sizeof(algo->alg_name));
1303 algo->alg_name[sizeof(algo->alg_name) - 1] = '\0';
1304 memcpy(algo->alg_key, enc_key.ptr, enc_key.len);
1305
1306 rthdr = XFRM_RTA_NEXT(rthdr);
1307 }
1308 }
1309
1310 if (int_alg != AUTH_UNDEFINED)
1311 {
1312 u_int trunc_len = 0;
1313
1314 alg_name = lookup_algorithm(INTEGRITY_ALGORITHM, int_alg);
1315 if (alg_name == NULL)
1316 {
1317 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1318 integrity_algorithm_names, int_alg);
1319 goto failed;
1320 }
1321 DBG2(DBG_KNL, " using integrity algorithm %N with key size %d",
1322 integrity_algorithm_names, int_alg, int_key.len * 8);
1323
1324 switch (int_alg)
1325 {
1326 case AUTH_HMAC_MD5_128:
1327 case AUTH_HMAC_SHA2_256_128:
1328 trunc_len = 128;
1329 break;
1330 case AUTH_HMAC_SHA1_160:
1331 trunc_len = 160;
1332 break;
1333 default:
1334 break;
1335 }
1336
1337 if (trunc_len)
1338 {
1339 struct xfrm_algo_auth* algo;
1340
1341 /* the kernel uses SHA256 with 96 bit truncation by default,
1342 * use specified truncation size supported by newer kernels.
1343 * also use this for untruncated MD5 and SHA1. */
1344 rthdr->rta_type = XFRMA_ALG_AUTH_TRUNC;
1345 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_auth) +
1346 int_key.len);
1347
1348 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1349 if (hdr->nlmsg_len > sizeof(request))
1350 {
1351 goto failed;
1352 }
1353
1354 algo = (struct xfrm_algo_auth*)RTA_DATA(rthdr);
1355 algo->alg_key_len = int_key.len * 8;
1356 algo->alg_trunc_len = trunc_len;
1357 strncpy(algo->alg_name, alg_name, sizeof(algo->alg_name));
1358 algo->alg_name[sizeof(algo->alg_name) - 1] = '\0';
1359 memcpy(algo->alg_key, int_key.ptr, int_key.len);
1360 }
1361 else
1362 {
1363 struct xfrm_algo* algo;
1364
1365 rthdr->rta_type = XFRMA_ALG_AUTH;
1366 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + int_key.len);
1367
1368 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1369 if (hdr->nlmsg_len > sizeof(request))
1370 {
1371 goto failed;
1372 }
1373
1374 algo = (struct xfrm_algo*)RTA_DATA(rthdr);
1375 algo->alg_key_len = int_key.len * 8;
1376 strncpy(algo->alg_name, alg_name, sizeof(algo->alg_name));
1377 algo->alg_name[sizeof(algo->alg_name) - 1] = '\0';
1378 memcpy(algo->alg_key, int_key.ptr, int_key.len);
1379 }
1380 rthdr = XFRM_RTA_NEXT(rthdr);
1381 }
1382
1383 if (ipcomp != IPCOMP_NONE)
1384 {
1385 rthdr->rta_type = XFRMA_ALG_COMP;
1386 alg_name = lookup_algorithm(COMPRESSION_ALGORITHM, ipcomp);
1387 if (alg_name == NULL)
1388 {
1389 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1390 ipcomp_transform_names, ipcomp);
1391 goto failed;
1392 }
1393 DBG2(DBG_KNL, " using compression algorithm %N",
1394 ipcomp_transform_names, ipcomp);
1395
1396 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo));
1397 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1398 if (hdr->nlmsg_len > sizeof(request))
1399 {
1400 goto failed;
1401 }
1402
1403 struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
1404 algo->alg_key_len = 0;
1405 strncpy(algo->alg_name, alg_name, sizeof(algo->alg_name));
1406 algo->alg_name[sizeof(algo->alg_name) - 1] = '\0';
1407
1408 rthdr = XFRM_RTA_NEXT(rthdr);
1409 }
1410
1411 if (encap)
1412 {
1413 struct xfrm_encap_tmpl *tmpl;
1414
1415 rthdr->rta_type = XFRMA_ENCAP;
1416 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl));
1417
1418 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1419 if (hdr->nlmsg_len > sizeof(request))
1420 {
1421 goto failed;
1422 }
1423
1424 tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rthdr);
1425 tmpl->encap_type = UDP_ENCAP_ESPINUDP;
1426 tmpl->encap_sport = htons(src->get_port(src));
1427 tmpl->encap_dport = htons(dst->get_port(dst));
1428 memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t));
1429 /* encap_oa could probably be derived from the
1430 * traffic selectors [rfc4306, p39]. In the netlink kernel
1431 * implementation pluto does the same as we do here but it uses
1432 * encap_oa in the pfkey implementation.
1433 * BUT as /usr/src/linux/net/key/af_key.c indicates the kernel ignores
1434 * it anyway
1435 * -> does that mean that NAT-T encap doesn't work in transport mode?
1436 * No. The reason the kernel ignores NAT-OA is that it recomputes
1437 * (or, rather, just ignores) the checksum. If packets pass the IPsec
1438 * checks it marks them "checksum ok" so OA isn't needed. */
1439 rthdr = XFRM_RTA_NEXT(rthdr);
1440 }
1441
1442 if (mark.value)
1443 {
1444 struct xfrm_mark *mrk;
1445
1446 rthdr->rta_type = XFRMA_MARK;
1447 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
1448
1449 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1450 if (hdr->nlmsg_len > sizeof(request))
1451 {
1452 goto failed;
1453 }
1454
1455 mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
1456 mrk->v = mark.value;
1457 mrk->m = mark.mask;
1458 rthdr = XFRM_RTA_NEXT(rthdr);
1459 }
1460
1461 if (tfc)
1462 {
1463 u_int32_t *tfcpad;
1464
1465 rthdr->rta_type = XFRMA_TFCPAD;
1466 rthdr->rta_len = RTA_LENGTH(sizeof(u_int32_t));
1467
1468 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1469 if (hdr->nlmsg_len > sizeof(request))
1470 {
1471 goto failed;
1472 }
1473
1474 tfcpad = (u_int32_t*)RTA_DATA(rthdr);
1475 *tfcpad = tfc;
1476 rthdr = XFRM_RTA_NEXT(rthdr);
1477 }
1478
1479 if (protocol != IPPROTO_COMP)
1480 {
1481 if (esn || this->replay_window > DEFAULT_REPLAY_WINDOW)
1482 {
1483 /* for ESN or larger replay windows we need the new
1484 * XFRMA_REPLAY_ESN_VAL attribute to configure a bitmap */
1485 struct xfrm_replay_state_esn *replay;
1486
1487 rthdr->rta_type = XFRMA_REPLAY_ESN_VAL;
1488 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state_esn) +
1489 (this->replay_window + 7) / 8);
1490
1491 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1492 if (hdr->nlmsg_len > sizeof(request))
1493 {
1494 goto failed;
1495 }
1496
1497 replay = (struct xfrm_replay_state_esn*)RTA_DATA(rthdr);
1498 /* bmp_len contains number uf __u32's */
1499 replay->bmp_len = this->replay_bmp;
1500 replay->replay_window = this->replay_window;
1501 DBG2(DBG_KNL, " using replay window of %u packets",
1502 this->replay_window);
1503
1504 rthdr = XFRM_RTA_NEXT(rthdr);
1505 if (esn)
1506 {
1507 DBG2(DBG_KNL, " using extended sequence numbers (ESN)");
1508 sa->flags |= XFRM_STATE_ESN;
1509 }
1510 }
1511 else
1512 {
1513 DBG2(DBG_KNL, " using replay window of %u packets",
1514 this->replay_window);
1515 sa->replay_window = this->replay_window;
1516 }
1517 }
1518
1519 if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
1520 {
1521 if (mark.value)
1522 {
1523 DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x "
1524 "(mark %u/0x%08x)", ntohl(spi), mark.value, mark.mask);
1525 }
1526 else
1527 {
1528 DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi));
1529 }
1530 goto failed;
1531 }
1532
1533 status = SUCCESS;
1534
1535 failed:
1536 memwipe(request, sizeof(request));
1537 return status;
1538 }
1539
1540 /**
1541 * Get the ESN replay state (i.e. sequence numbers) of an SA.
1542 *
1543 * Allocates into one the replay state structure we get from the kernel.
1544 */
1545 static void get_replay_state(private_kernel_netlink_ipsec_t *this,
1546 u_int32_t spi, u_int8_t protocol,
1547 host_t *dst, mark_t mark,
1548 struct xfrm_replay_state_esn **replay_esn,
1549 struct xfrm_replay_state **replay)
1550 {
1551 netlink_buf_t request;
1552 struct nlmsghdr *hdr, *out = NULL;
1553 struct xfrm_aevent_id *out_aevent = NULL, *aevent_id;
1554 size_t len;
1555 struct rtattr *rta;
1556 size_t rtasize;
1557
1558 memset(&request, 0, sizeof(request));
1559
1560 DBG2(DBG_KNL, "querying replay state from SAD entry with SPI %.8x",
1561 ntohl(spi));
1562
1563 hdr = (struct nlmsghdr*)request;
1564 hdr->nlmsg_flags = NLM_F_REQUEST;
1565 hdr->nlmsg_type = XFRM_MSG_GETAE;
1566 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1567
1568 aevent_id = (struct xfrm_aevent_id*)NLMSG_DATA(hdr);
1569 aevent_id->flags = XFRM_AE_RVAL;
1570
1571 host2xfrm(dst, &aevent_id->sa_id.daddr);
1572 aevent_id->sa_id.spi = spi;
1573 aevent_id->sa_id.proto = protocol;
1574 aevent_id->sa_id.family = dst->get_family(dst);
1575
1576 if (mark.value)
1577 {
1578 struct xfrm_mark *mrk;
1579 struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_aevent_id);
1580
1581 rthdr->rta_type = XFRMA_MARK;
1582 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
1583 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1584 if (hdr->nlmsg_len > sizeof(request))
1585 {
1586 return;
1587 }
1588
1589 mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
1590 mrk->v = mark.value;
1591 mrk->m = mark.mask;
1592 }
1593
1594 if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
1595 {
1596 hdr = out;
1597 while (NLMSG_OK(hdr, len))
1598 {
1599 switch (hdr->nlmsg_type)
1600 {
1601 case XFRM_MSG_NEWAE:
1602 {
1603 out_aevent = NLMSG_DATA(hdr);
1604 break;
1605 }
1606 case NLMSG_ERROR:
1607 {
1608 struct nlmsgerr *err = NLMSG_DATA(hdr);
1609 DBG1(DBG_KNL, "querying replay state from SAD entry "
1610 "failed: %s (%d)", strerror(-err->error),
1611 -err->error);
1612 break;
1613 }
1614 default:
1615 hdr = NLMSG_NEXT(hdr, len);
1616 continue;
1617 case NLMSG_DONE:
1618 break;
1619 }
1620 break;
1621 }
1622 }
1623
1624 if (out_aevent)
1625 {
1626 rta = XFRM_RTA(out, struct xfrm_aevent_id);
1627 rtasize = XFRM_PAYLOAD(out, struct xfrm_aevent_id);
1628 while (RTA_OK(rta, rtasize))
1629 {
1630 if (rta->rta_type == XFRMA_REPLAY_VAL &&
1631 RTA_PAYLOAD(rta) == sizeof(**replay))
1632 {
1633 *replay = malloc(RTA_PAYLOAD(rta));
1634 memcpy(*replay, RTA_DATA(rta), RTA_PAYLOAD(rta));
1635 break;
1636 }
1637 if (rta->rta_type == XFRMA_REPLAY_ESN_VAL &&
1638 RTA_PAYLOAD(rta) >= sizeof(**replay_esn) + this->replay_bmp)
1639 {
1640 *replay_esn = malloc(RTA_PAYLOAD(rta));
1641 memcpy(*replay_esn, RTA_DATA(rta), RTA_PAYLOAD(rta));
1642 break;
1643 }
1644 rta = RTA_NEXT(rta, rtasize);
1645 }
1646 }
1647 free(out);
1648 }
1649
1650 METHOD(kernel_ipsec_t, query_sa, status_t,
1651 private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
1652 u_int32_t spi, u_int8_t protocol, mark_t mark, u_int64_t *bytes)
1653 {
1654 netlink_buf_t request;
1655 struct nlmsghdr *out = NULL, *hdr;
1656 struct xfrm_usersa_id *sa_id;
1657 struct xfrm_usersa_info *sa = NULL;
1658 status_t status = FAILED;
1659 size_t len;
1660
1661 memset(&request, 0, sizeof(request));
1662
1663 DBG2(DBG_KNL, "querying SAD entry with SPI %.8x (mark %u/0x%08x)",
1664 ntohl(spi), mark.value, mark.mask);
1665
1666 hdr = (struct nlmsghdr*)request;
1667 hdr->nlmsg_flags = NLM_F_REQUEST;
1668 hdr->nlmsg_type = XFRM_MSG_GETSA;
1669 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
1670
1671 sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
1672 host2xfrm(dst, &sa_id->daddr);
1673 sa_id->spi = spi;
1674 sa_id->proto = protocol;
1675 sa_id->family = dst->get_family(dst);
1676
1677 if (mark.value)
1678 {
1679 struct xfrm_mark *mrk;
1680 struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_id);
1681
1682 rthdr->rta_type = XFRMA_MARK;
1683 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
1684 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1685 if (hdr->nlmsg_len > sizeof(request))
1686 {
1687 return FAILED;
1688 }
1689
1690 mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
1691 mrk->v = mark.value;
1692 mrk->m = mark.mask;
1693 }
1694
1695 if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
1696 {
1697 hdr = out;
1698 while (NLMSG_OK(hdr, len))
1699 {
1700 switch (hdr->nlmsg_type)
1701 {
1702 case XFRM_MSG_NEWSA:
1703 {
1704 sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr);
1705 break;
1706 }
1707 case NLMSG_ERROR:
1708 {
1709 struct nlmsgerr *err = NLMSG_DATA(hdr);
1710
1711 if (mark.value)
1712 {
1713 DBG1(DBG_KNL, "querying SAD entry with SPI %.8x "
1714 "(mark %u/0x%08x) failed: %s (%d)",
1715 ntohl(spi), mark.value, mark.mask,
1716 strerror(-err->error), -err->error);
1717 }
1718 else
1719 {
1720 DBG1(DBG_KNL, "querying SAD entry with SPI %.8x "
1721 "failed: %s (%d)", ntohl(spi),
1722 strerror(-err->error), -err->error);
1723 }
1724 break;
1725 }
1726 default:
1727 hdr = NLMSG_NEXT(hdr, len);
1728 continue;
1729 case NLMSG_DONE:
1730 break;
1731 }
1732 break;
1733 }
1734 }
1735
1736 if (sa == NULL)
1737 {
1738 DBG2(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1739 }
1740 else
1741 {
1742 *bytes = sa->curlft.bytes;
1743 status = SUCCESS;
1744 }
1745 memwipe(out, len);
1746 free(out);
1747 return status;
1748 }
1749
1750 METHOD(kernel_ipsec_t, del_sa, status_t,
1751 private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
1752 u_int32_t spi, u_int8_t protocol, u_int16_t cpi, mark_t mark)
1753 {
1754 netlink_buf_t request;
1755 struct nlmsghdr *hdr;
1756 struct xfrm_usersa_id *sa_id;
1757
1758 /* if IPComp was used, we first delete the additional IPComp SA */
1759 if (cpi)
1760 {
1761 del_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, 0, mark);
1762 }
1763
1764 memset(&request, 0, sizeof(request));
1765
1766 DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x (mark %u/0x%08x)",
1767 ntohl(spi), mark.value, mark.mask);
1768
1769 hdr = (struct nlmsghdr*)request;
1770 hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
1771 hdr->nlmsg_type = XFRM_MSG_DELSA;
1772 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
1773
1774 sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
1775 host2xfrm(dst, &sa_id->daddr);
1776 sa_id->spi = spi;
1777 sa_id->proto = protocol;
1778 sa_id->family = dst->get_family(dst);
1779
1780 if (mark.value)
1781 {
1782 struct xfrm_mark *mrk;
1783 struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_id);
1784
1785 rthdr->rta_type = XFRMA_MARK;
1786 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
1787 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1788 if (hdr->nlmsg_len > sizeof(request))
1789 {
1790 return FAILED;
1791 }
1792
1793 mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
1794 mrk->v = mark.value;
1795 mrk->m = mark.mask;
1796 }
1797
1798 switch (this->socket_xfrm->send_ack(this->socket_xfrm, hdr))
1799 {
1800 case SUCCESS:
1801 DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x (mark %u/0x%08x)",
1802 ntohl(spi), mark.value, mark.mask);
1803 return SUCCESS;
1804 case NOT_FOUND:
1805 return NOT_FOUND;
1806 default:
1807 if (mark.value)
1808 {
1809 DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x "
1810 "(mark %u/0x%08x)", ntohl(spi), mark.value, mark.mask);
1811 }
1812 else
1813 {
1814 DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x",
1815 ntohl(spi));
1816 }
1817 return FAILED;
1818 }
1819 }
1820
1821 METHOD(kernel_ipsec_t, update_sa, status_t,
1822 private_kernel_netlink_ipsec_t *this, u_int32_t spi, u_int8_t protocol,
1823 u_int16_t cpi, host_t *src, host_t *dst, host_t *new_src, host_t *new_dst,
1824 bool old_encap, bool new_encap, mark_t mark)
1825 {
1826 netlink_buf_t request;
1827 u_char *pos;
1828 struct nlmsghdr *hdr, *out = NULL;
1829 struct xfrm_usersa_id *sa_id;
1830 struct xfrm_usersa_info *out_sa = NULL, *sa;
1831 size_t len;
1832 struct rtattr *rta;
1833 size_t rtasize;
1834 struct xfrm_encap_tmpl* tmpl = NULL;
1835 struct xfrm_replay_state *replay = NULL;
1836 struct xfrm_replay_state_esn *replay_esn = NULL;
1837 status_t status = FAILED;
1838
1839 /* if IPComp is used, we first update the IPComp SA */
1840 if (cpi)
1841 {
1842 update_sa(this, htonl(ntohs(cpi)), IPPROTO_COMP, 0,
1843 src, dst, new_src, new_dst, FALSE, FALSE, mark);
1844 }
1845
1846 memset(&request, 0, sizeof(request));
1847
1848 DBG2(DBG_KNL, "querying SAD entry with SPI %.8x for update", ntohl(spi));
1849
1850 /* query the existing SA first */
1851 hdr = (struct nlmsghdr*)request;
1852 hdr->nlmsg_flags = NLM_F_REQUEST;
1853 hdr->nlmsg_type = XFRM_MSG_GETSA;
1854 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
1855
1856 sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
1857 host2xfrm(dst, &sa_id->daddr);
1858 sa_id->spi = spi;
1859 sa_id->proto = protocol;
1860 sa_id->family = dst->get_family(dst);
1861
1862 if (mark.value)
1863 {
1864 struct xfrm_mark *mrk;
1865 struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_id);
1866
1867 rthdr->rta_type = XFRMA_MARK;
1868 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
1869 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
1870 if (hdr->nlmsg_len > sizeof(request))
1871 {
1872 return FAILED;
1873 }
1874
1875 mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
1876 mrk->v = mark.value;
1877 mrk->m = mark.mask;
1878 }
1879
1880 if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
1881 {
1882 hdr = out;
1883 while (NLMSG_OK(hdr, len))
1884 {
1885 switch (hdr->nlmsg_type)
1886 {
1887 case XFRM_MSG_NEWSA:
1888 {
1889 out_sa = NLMSG_DATA(hdr);
1890 break;
1891 }
1892 case NLMSG_ERROR:
1893 {
1894 struct nlmsgerr *err = NLMSG_DATA(hdr);
1895 DBG1(DBG_KNL, "querying SAD entry failed: %s (%d)",
1896 strerror(-err->error), -err->error);
1897 break;
1898 }
1899 default:
1900 hdr = NLMSG_NEXT(hdr, len);
1901 continue;
1902 case NLMSG_DONE:
1903 break;
1904 }
1905 break;
1906 }
1907 }
1908 if (out_sa == NULL)
1909 {
1910 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
1911 goto failed;
1912 }
1913
1914 get_replay_state(this, spi, protocol, dst, mark, &replay_esn, &replay);
1915
1916 /* delete the old SA (without affecting the IPComp SA) */
1917 if (del_sa(this, src, dst, spi, protocol, 0, mark) != SUCCESS)
1918 {
1919 DBG1(DBG_KNL, "unable to delete old SAD entry with SPI %.8x",
1920 ntohl(spi));
1921 goto failed;
1922 }
1923
1924 DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H",
1925 ntohl(spi), src, dst, new_src, new_dst);
1926 /* copy over the SA from out to request */
1927 hdr = (struct nlmsghdr*)request;
1928 memcpy(hdr, out, min(out->nlmsg_len, sizeof(request)));
1929 hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
1930 hdr->nlmsg_type = XFRM_MSG_NEWSA;
1931 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
1932 sa = NLMSG_DATA(hdr);
1933 sa->family = new_dst->get_family(new_dst);
1934
1935 if (!src->ip_equals(src, new_src))
1936 {
1937 host2xfrm(new_src, &sa->saddr);
1938 }
1939 if (!dst->ip_equals(dst, new_dst))
1940 {
1941 host2xfrm(new_dst, &sa->id.daddr);
1942 }
1943
1944 rta = XFRM_RTA(out, struct xfrm_usersa_info);
1945 rtasize = XFRM_PAYLOAD(out, struct xfrm_usersa_info);
1946 pos = (u_char*)XFRM_RTA(hdr, struct xfrm_usersa_info);
1947 while(RTA_OK(rta, rtasize))
1948 {
1949 /* copy all attributes, but not XFRMA_ENCAP if we are disabling it */
1950 if (rta->rta_type != XFRMA_ENCAP || new_encap)
1951 {
1952 if (rta->rta_type == XFRMA_ENCAP)
1953 { /* update encap tmpl */
1954 tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta);
1955 tmpl->encap_sport = ntohs(new_src->get_port(new_src));
1956 tmpl->encap_dport = ntohs(new_dst->get_port(new_dst));
1957 }
1958 memcpy(pos, rta, rta->rta_len);
1959 pos += RTA_ALIGN(rta->rta_len);
1960 hdr->nlmsg_len += RTA_ALIGN(rta->rta_len);
1961 }
1962 rta = RTA_NEXT(rta, rtasize);
1963 }
1964
1965 rta = (struct rtattr*)pos;
1966 if (tmpl == NULL && new_encap)
1967 { /* add tmpl if we are enabling it */
1968 rta->rta_type = XFRMA_ENCAP;
1969 rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl));
1970
1971 hdr->nlmsg_len += RTA_ALIGN(rta->rta_len);
1972 if (hdr->nlmsg_len > sizeof(request))
1973 {
1974 goto failed;
1975 }
1976
1977 tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta);
1978 tmpl->encap_type = UDP_ENCAP_ESPINUDP;
1979 tmpl->encap_sport = ntohs(new_src->get_port(new_src));
1980 tmpl->encap_dport = ntohs(new_dst->get_port(new_dst));
1981 memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t));
1982
1983 rta = XFRM_RTA_NEXT(rta);
1984 }
1985
1986 if (replay_esn)
1987 {
1988 rta->rta_type = XFRMA_REPLAY_ESN_VAL;
1989 rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state_esn) +
1990 this->replay_bmp);
1991
1992 hdr->nlmsg_len += RTA_ALIGN(rta->rta_len);
1993 if (hdr->nlmsg_len > sizeof(request))
1994 {
1995 goto failed;
1996 }
1997 memcpy(RTA_DATA(rta), replay_esn,
1998 sizeof(struct xfrm_replay_state_esn) + this->replay_bmp);
1999
2000 rta = XFRM_RTA_NEXT(rta);
2001 }
2002 else if (replay)
2003 {
2004 rta->rta_type = XFRMA_REPLAY_VAL;
2005 rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state));
2006
2007 hdr->nlmsg_len += RTA_ALIGN(rta->rta_len);
2008 if (hdr->nlmsg_len > sizeof(request))
2009 {
2010 goto failed;
2011 }
2012 memcpy(RTA_DATA(rta), replay, sizeof(struct xfrm_replay_state));
2013
2014 rta = XFRM_RTA_NEXT(rta);
2015 }
2016 else
2017 {
2018 DBG1(DBG_KNL, "unable to copy replay state from old SAD entry "
2019 "with SPI %.8x", ntohl(spi));
2020 }
2021
2022 if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
2023 {
2024 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
2025 goto failed;
2026 }
2027
2028 status = SUCCESS;
2029 failed:
2030 free(replay);
2031 free(replay_esn);
2032 memwipe(out, len);
2033 memwipe(request, sizeof(request));
2034 free(out);
2035
2036 return status;
2037 }
2038
2039 METHOD(kernel_ipsec_t, flush_sas, status_t,
2040 private_kernel_netlink_ipsec_t *this)
2041 {
2042 netlink_buf_t request;
2043 struct nlmsghdr *hdr;
2044 struct xfrm_usersa_flush *flush;
2045
2046 memset(&request, 0, sizeof(request));
2047
2048 DBG2(DBG_KNL, "flushing all SAD entries");
2049
2050 hdr = (struct nlmsghdr*)request;
2051 hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
2052 hdr->nlmsg_type = XFRM_MSG_FLUSHSA;
2053 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
2054
2055 flush = (struct xfrm_usersa_flush*)NLMSG_DATA(hdr);
2056 flush->proto = IPSEC_PROTO_ANY;
2057
2058 if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
2059 {
2060 DBG1(DBG_KNL, "unable to flush SAD entries");
2061 return FAILED;
2062 }
2063 return SUCCESS;
2064 }
2065
2066 /**
2067 * Add or update a policy in the kernel.
2068 *
2069 * Note: The mutex has to be locked when entering this function
2070 * and is unlocked here in any case.
2071 */
2072 static status_t add_policy_internal(private_kernel_netlink_ipsec_t *this,
2073 policy_entry_t *policy, policy_sa_t *mapping, bool update)
2074 {
2075 netlink_buf_t request;
2076 policy_entry_t clone;
2077 ipsec_sa_t *ipsec = mapping->sa;
2078 struct xfrm_userpolicy_info *policy_info;
2079 struct nlmsghdr *hdr;
2080 int i;
2081
2082 /* clone the policy so we are able to check it out again later */
2083 memcpy(&clone, policy, sizeof(policy_entry_t));
2084
2085 memset(&request, 0, sizeof(request));
2086 hdr = (struct nlmsghdr*)request;
2087 hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
2088 hdr->nlmsg_type = update ? XFRM_MSG_UPDPOLICY : XFRM_MSG_NEWPOLICY;
2089 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info));
2090
2091 policy_info = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr);
2092 policy_info->sel = policy->sel;
2093 policy_info->dir = policy->direction;
2094
2095 /* calculate priority based on selector size, small size = high prio */
2096 policy_info->priority = mapping->priority;
2097 policy_info->action = mapping->type != POLICY_DROP ? XFRM_POLICY_ALLOW
2098 : XFRM_POLICY_BLOCK;
2099 policy_info->share = XFRM_SHARE_ANY;
2100
2101 /* policies don't expire */
2102 policy_info->lft.soft_byte_limit = XFRM_INF;
2103 policy_info->lft.soft_packet_limit = XFRM_INF;
2104 policy_info->lft.hard_byte_limit = XFRM_INF;
2105 policy_info->lft.hard_packet_limit = XFRM_INF;
2106 policy_info->lft.soft_add_expires_seconds = 0;
2107 policy_info->lft.hard_add_expires_seconds = 0;
2108 policy_info->lft.soft_use_expires_seconds = 0;
2109 policy_info->lft.hard_use_expires_seconds = 0;
2110
2111 struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_info);
2112
2113 if (mapping->type == POLICY_IPSEC)
2114 {
2115 struct xfrm_user_tmpl *tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rthdr);
2116 struct {
2117 u_int8_t proto;
2118 bool use;
2119 } protos[] = {
2120 { IPPROTO_COMP, ipsec->cfg.ipcomp.transform != IPCOMP_NONE },
2121 { IPPROTO_ESP, ipsec->cfg.esp.use },
2122 { IPPROTO_AH, ipsec->cfg.ah.use },
2123 };
2124 ipsec_mode_t proto_mode = ipsec->cfg.mode;
2125
2126 rthdr->rta_type = XFRMA_TMPL;
2127 rthdr->rta_len = 0; /* actual length is set below */
2128
2129 for (i = 0; i < countof(protos); i++)
2130 {
2131 if (!protos[i].use)
2132 {
2133 continue;
2134 }
2135
2136 rthdr->rta_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
2137 hdr->nlmsg_len += RTA_ALIGN(RTA_LENGTH(sizeof(struct xfrm_user_tmpl)));
2138 if (hdr->nlmsg_len > sizeof(request))
2139 {
2140 this->mutex->unlock(this->mutex);
2141 return FAILED;
2142 }
2143
2144 tmpl->reqid = ipsec->cfg.reqid;
2145 tmpl->id.proto = protos[i].proto;
2146 tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0;
2147 tmpl->mode = mode2kernel(proto_mode);
2148 tmpl->optional = protos[i].proto == IPPROTO_COMP &&
2149 policy->direction != POLICY_OUT;
2150 tmpl->family = ipsec->src->get_family(ipsec->src);
2151
2152 if (proto_mode == MODE_TUNNEL)
2153 { /* only for tunnel mode */
2154 host2xfrm(ipsec->src, &tmpl->saddr);
2155 host2xfrm(ipsec->dst, &tmpl->id.daddr);
2156 }
2157
2158 tmpl++;
2159
2160 /* use transport mode for other SAs */
2161 proto_mode = MODE_TRANSPORT;
2162 }
2163
2164 rthdr = XFRM_RTA_NEXT(rthdr);
2165 }
2166
2167 if (ipsec->mark.value)
2168 {
2169 struct xfrm_mark *mrk;
2170
2171 rthdr->rta_type = XFRMA_MARK;
2172 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
2173
2174 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
2175 if (hdr->nlmsg_len > sizeof(request))
2176 {
2177 this->mutex->unlock(this->mutex);
2178 return FAILED;
2179 }
2180
2181 mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
2182 mrk->v = ipsec->mark.value;
2183 mrk->m = ipsec->mark.mask;
2184 }
2185 this->mutex->unlock(this->mutex);
2186
2187 if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
2188 {
2189 return FAILED;
2190 }
2191
2192 /* find the policy again */
2193 this->mutex->lock(this->mutex);
2194 policy = this->policies->get(this->policies, &clone);
2195 if (!policy ||
2196 policy->used_by->find_first(policy->used_by,
2197 NULL, (void**)&mapping) != SUCCESS)
2198 { /* policy or mapping is already gone, ignore */
2199 this->mutex->unlock(this->mutex);
2200 return SUCCESS;
2201 }
2202
2203 /* install a route, if:
2204 * - this is a forward policy (to just get one for each child)
2205 * - we are in tunnel/BEET mode
2206 * - routing is not disabled via strongswan.conf
2207 */
2208 if (policy->direction == POLICY_FWD &&
2209 ipsec->cfg.mode != MODE_TRANSPORT && this->install_routes)
2210 {
2211 policy_sa_fwd_t *fwd = (policy_sa_fwd_t*)mapping;
2212 route_entry_t *route;
2213
2214 INIT(route,
2215 .prefixlen = policy->sel.prefixlen_s,
2216 );
2217
2218 if (hydra->kernel_interface->get_address_by_ts(hydra->kernel_interface,
2219 fwd->dst_ts, &route->src_ip) == SUCCESS)
2220 {
2221 /* get the nexthop to src (src as we are in POLICY_FWD) */
2222 route->gateway = hydra->kernel_interface->get_nexthop(
2223 hydra->kernel_interface, ipsec->src,
2224 ipsec->dst);
2225 route->dst_net = chunk_alloc(policy->sel.family == AF_INET ? 4 : 16);
2226 memcpy(route->dst_net.ptr, &policy->sel.saddr, route->dst_net.len);
2227
2228 /* install route via outgoing interface */
2229 if (!hydra->kernel_interface->get_interface(hydra->kernel_interface,
2230 ipsec->dst, &route->if_name))
2231 {
2232 this->mutex->unlock(this->mutex);
2233 route_entry_destroy(route);
2234 return SUCCESS;
2235 }
2236
2237 if (policy->route)
2238 {
2239 route_entry_t *old = policy->route;
2240 if (route_entry_equals(old, route))
2241 {
2242 this->mutex->unlock(this->mutex);
2243 route_entry_destroy(route);
2244 return SUCCESS;
2245 }
2246 /* uninstall previously installed route */
2247 if (hydra->kernel_interface->del_route(hydra->kernel_interface,
2248 old->dst_net, old->prefixlen, old->gateway,
2249 old->src_ip, old->if_name) != SUCCESS)
2250 {
2251 DBG1(DBG_KNL, "error uninstalling route installed with "
2252 "policy %R === %R %N", fwd->src_ts,
2253 fwd->dst_ts, policy_dir_names,
2254 policy->direction);
2255 }
2256 route_entry_destroy(old);
2257 policy->route = NULL;
2258 }
2259
2260 DBG2(DBG_KNL, "installing route: %R via %H src %H dev %s",
2261 fwd->src_ts, route->gateway, route->src_ip, route->if_name);
2262 switch (hydra->kernel_interface->add_route(
2263 hydra->kernel_interface, route->dst_net,
2264 route->prefixlen, route->gateway,
2265 route->src_ip, route->if_name))
2266 {
2267 default:
2268 DBG1(DBG_KNL, "unable to install source route for %H",
2269 route->src_ip);
2270 /* FALL */
2271 case ALREADY_DONE:
2272 /* route exists, do not uninstall */
2273 route_entry_destroy(route);
2274 break;
2275 case SUCCESS:
2276 /* cache the installed route */
2277 policy->route = route;
2278 break;
2279 }
2280 }
2281 else
2282 {
2283 free(route);
2284 }
2285 }
2286 this->mutex->unlock(this->mutex);
2287 return SUCCESS;
2288 }
2289
2290 METHOD(kernel_ipsec_t, add_policy, status_t,
2291 private_kernel_netlink_ipsec_t *this, host_t *src, host_t *dst,
2292 traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
2293 policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa,
2294 mark_t mark, policy_priority_t priority)
2295 {
2296 policy_entry_t *policy, *current;
2297 policy_sa_t *assigned_sa, *current_sa;
2298 enumerator_t *enumerator;
2299 bool found = FALSE, update = TRUE;
2300
2301 /* create a policy */
2302 INIT(policy,
2303 .sel = ts2selector(src_ts, dst_ts),
2304 .mark = mark.value & mark.mask,
2305 .direction = direction,
2306 );
2307
2308 /* find the policy, which matches EXACTLY */
2309 this->mutex->lock(this->mutex);
2310 current = this->policies->get(this->policies, policy);
2311 if (current)
2312 {
2313 /* use existing policy */
2314 DBG2(DBG_KNL, "policy %R === %R %N (mark %u/0x%08x) "
2315 "already exists, increasing refcount",
2316 src_ts, dst_ts, policy_dir_names, direction,
2317 mark.value, mark.mask);
2318 policy_entry_destroy(this, policy);
2319 policy = current;
2320 found = TRUE;
2321 }
2322 else
2323 { /* use the new one, if we have no such policy */
2324 policy->used_by = linked_list_create();
2325 this->policies->put(this->policies, policy, policy);
2326 }
2327
2328 /* cache the assigned IPsec SA */
2329 assigned_sa = policy_sa_create(this, direction, type, src, dst, src_ts,
2330 dst_ts, mark, sa);
2331 assigned_sa->priority = get_priority(policy, priority);
2332
2333 if (this->policy_history)
2334 { /* insert the SA according to its priority */
2335 enumerator = policy->used_by->create_enumerator(policy->used_by);
2336 while (enumerator->enumerate(enumerator, (void**)&current_sa))
2337 {
2338 if (current_sa->priority >= assigned_sa->priority)
2339 {
2340 break;
2341 }
2342 update = FALSE;
2343 }
2344 policy->used_by->insert_before(policy->used_by, enumerator,
2345 assigned_sa);
2346 enumerator->destroy(enumerator);
2347 }
2348 else
2349 { /* simply insert it last and only update if it is not installed yet */
2350 policy->used_by->insert_last(policy->used_by, assigned_sa);
2351 update = !found;
2352 }
2353
2354 if (!update)
2355 { /* we don't update the policy if the priority is lower than that of
2356 * the currently installed one */
2357 this->mutex->unlock(this->mutex);
2358 return SUCCESS;
2359 }
2360
2361 DBG2(DBG_KNL, "%s policy %R === %R %N (mark %u/0x%08x)",
2362 found ? "updating" : "adding", src_ts, dst_ts,
2363 policy_dir_names, direction, mark.value, mark.mask);
2364
2365 if (add_policy_internal(this, policy, assigned_sa, found) != SUCCESS)
2366 {
2367 DBG1(DBG_KNL, "unable to %s policy %R === %R %N",
2368 found ? "update" : "add", src_ts, dst_ts,
2369 policy_dir_names, direction);
2370 return FAILED;
2371 }
2372 return SUCCESS;
2373 }
2374
2375 METHOD(kernel_ipsec_t, query_policy, status_t,
2376 private_kernel_netlink_ipsec_t *this, traffic_selector_t *src_ts,
2377 traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
2378 u_int32_t *use_time)
2379 {
2380 netlink_buf_t request;
2381 struct nlmsghdr *out = NULL, *hdr;
2382 struct xfrm_userpolicy_id *policy_id;
2383 struct xfrm_userpolicy_info *policy = NULL;
2384 size_t len;
2385
2386 memset(&request, 0, sizeof(request));
2387
2388 DBG2(DBG_KNL, "querying policy %R === %R %N (mark %u/0x%08x)",
2389 src_ts, dst_ts, policy_dir_names, direction,
2390 mark.value, mark.mask);
2391
2392 hdr = (struct nlmsghdr*)request;
2393 hdr->nlmsg_flags = NLM_F_REQUEST;
2394 hdr->nlmsg_type = XFRM_MSG_GETPOLICY;
2395 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
2396
2397 policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
2398 policy_id->sel = ts2selector(src_ts, dst_ts);
2399 policy_id->dir = direction;
2400
2401 if (mark.value)
2402 {
2403 struct xfrm_mark *mrk;
2404 struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_id);
2405
2406 rthdr->rta_type = XFRMA_MARK;
2407 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
2408
2409 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
2410 if (hdr->nlmsg_len > sizeof(request))
2411 {
2412 return FAILED;
2413 }
2414
2415 mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
2416 mrk->v = mark.value;
2417 mrk->m = mark.mask;
2418 }
2419
2420 if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
2421 {
2422 hdr = out;
2423 while (NLMSG_OK(hdr, len))
2424 {
2425 switch (hdr->nlmsg_type)
2426 {
2427 case XFRM_MSG_NEWPOLICY:
2428 {
2429 policy = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr);
2430 break;
2431 }
2432 case NLMSG_ERROR:
2433 {
2434 struct nlmsgerr *err = NLMSG_DATA(hdr);
2435 DBG1(DBG_KNL, "querying policy failed: %s (%d)",
2436 strerror(-err->error), -err->error);
2437 break;
2438 }
2439 default:
2440 hdr = NLMSG_NEXT(hdr, len);
2441 continue;
2442 case NLMSG_DONE:
2443 break;
2444 }
2445 break;
2446 }
2447 }
2448
2449 if (policy == NULL)
2450 {
2451 DBG2(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts,
2452 policy_dir_names, direction);
2453 free(out);
2454 return FAILED;
2455 }
2456
2457 if (policy->curlft.use_time)
2458 {
2459 /* we need the monotonic time, but the kernel returns system time. */
2460 *use_time = time_monotonic(NULL) - (time(NULL) - policy->curlft.use_time);
2461 }
2462 else
2463 {
2464 *use_time = 0;
2465 }
2466
2467 free(out);
2468 return SUCCESS;
2469 }
2470
2471 METHOD(kernel_ipsec_t, del_policy, status_t,
2472 private_kernel_netlink_ipsec_t *this, traffic_selector_t *src_ts,
2473 traffic_selector_t *dst_ts, policy_dir_t direction, u_int32_t reqid,
2474 mark_t mark, policy_priority_t prio)
2475 {
2476 policy_entry_t *current, policy;
2477 enumerator_t *enumerator;
2478 policy_sa_t *mapping;
2479 netlink_buf_t request;
2480 struct nlmsghdr *hdr;
2481 struct xfrm_userpolicy_id *policy_id;
2482 bool is_installed = TRUE;
2483 u_int32_t priority;
2484
2485 DBG2(DBG_KNL, "deleting policy %R === %R %N (mark %u/0x%08x)",
2486 src_ts, dst_ts, policy_dir_names, direction,
2487 mark.value, mark.mask);
2488
2489 /* create a policy */
2490 memset(&policy, 0, sizeof(policy_entry_t));
2491 policy.sel = ts2selector(src_ts, dst_ts);
2492 policy.mark = mark.value & mark.mask;
2493 policy.direction = direction;
2494
2495 /* find the policy */
2496 this->mutex->lock(this->mutex);
2497 current = this->policies->get(this->policies, &policy);
2498 if (!current)
2499 {
2500 if (mark.value)
2501 {
2502 DBG1(DBG_KNL, "deleting policy %R === %R %N (mark %u/0x%08x) "
2503 "failed, not found", src_ts, dst_ts, policy_dir_names,
2504 direction, mark.value, mark.mask);
2505 }
2506 else
2507 {
2508 DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found",
2509 src_ts, dst_ts, policy_dir_names, direction);
2510 }
2511 this->mutex->unlock(this->mutex);
2512 return NOT_FOUND;
2513 }
2514
2515 if (this->policy_history)
2516 { /* remove mapping to SA by reqid and priority */
2517 priority = get_priority(current, prio);
2518 enumerator = current->used_by->create_enumerator(current->used_by);
2519 while (enumerator->enumerate(enumerator, (void**)&mapping))
2520 {
2521 if (reqid == mapping->sa->cfg.reqid &&
2522 priority == mapping->priority)
2523 {
2524 current->used_by->remove_at(current->used_by, enumerator);
2525 policy_sa_destroy(mapping, &direction, this);
2526 break;
2527 }
2528 is_installed = FALSE;
2529 }
2530 enumerator->destroy(enumerator);
2531 }
2532 else
2533 { /* remove one of the SAs but don't update the policy */
2534 current->used_by->remove_last(current->used_by, (void**)&mapping);
2535 policy_sa_destroy(mapping, &direction, this);
2536 is_installed = FALSE;
2537 }
2538
2539 if (current->used_by->get_count(current->used_by) > 0)
2540 { /* policy is used by more SAs, keep in kernel */
2541 DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
2542 if (!is_installed)
2543 { /* no need to update as the policy was not installed for this SA */
2544 this->mutex->unlock(this->mutex);
2545 return SUCCESS;
2546 }
2547
2548 DBG2(DBG_KNL, "updating policy %R === %R %N (mark %u/0x%08x)",
2549 src_ts, dst_ts, policy_dir_names, direction,
2550 mark.value, mark.mask);
2551
2552 current->used_by->get_first(current->used_by, (void**)&mapping);
2553 if (add_policy_internal(this, current, mapping, TRUE) != SUCCESS)
2554 {
2555 DBG1(DBG_KNL, "unable to update policy %R === %R %N",
2556 src_ts, dst_ts, policy_dir_names, direction);
2557 return FAILED;
2558 }
2559 return SUCCESS;
2560 }
2561
2562 memset(&request, 0, sizeof(request));
2563
2564 hdr = (struct nlmsghdr*)request;
2565 hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
2566 hdr->nlmsg_type = XFRM_MSG_DELPOLICY;
2567 hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
2568
2569 policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
2570 policy_id->sel = current->sel;
2571 policy_id->dir = direction;
2572
2573 if (mark.value)
2574 {
2575 struct xfrm_mark *mrk;
2576 struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_id);
2577
2578 rthdr->rta_type = XFRMA_MARK;
2579 rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_mark));
2580 hdr->nlmsg_len += RTA_ALIGN(rthdr->rta_len);
2581 if (hdr->nlmsg_len > sizeof(request))
2582 {
2583 this->mutex->unlock(this->mutex);
2584 return FAILED;
2585 }
2586
2587 mrk = (struct xfrm_mark*)RTA_DATA(rthdr);
2588 mrk->v = mark.value;
2589 mrk->m = mark.mask;
2590 }
2591
2592 if (current->route)
2593 {
2594 route_entry_t *route = current->route;
2595 if (hydra->kernel_interface->del_route(hydra->kernel_interface,
2596 route->dst_net, route->prefixlen, route->gateway,
2597 route->src_ip, route->if_name) != SUCCESS)
2598 {
2599 DBG1(DBG_KNL, "error uninstalling route installed with "
2600 "policy %R === %R %N", src_ts, dst_ts,
2601 policy_dir_names, direction);
2602 }
2603 }
2604
2605 this->policies->remove(this->policies, current);
2606 policy_entry_destroy(this, current);
2607 this->mutex->unlock(this->mutex);
2608
2609 if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
2610 {
2611 if (mark.value)
2612 {
2613 DBG1(DBG_KNL, "unable to delete policy %R === %R %N "
2614 "(mark %u/0x%08x)", src_ts, dst_ts, policy_dir_names,
2615 direction, mark.value, mark.mask);
2616 }
2617 else
2618 {
2619 DBG1(DBG_KNL, "unable to delete policy %R === %R %N",
2620 src_ts, dst_ts, policy_dir_names, direction);
2621 }
2622 return FAILED;
2623 }
2624 return SUCCESS;
2625 }
2626
2627 METHOD(kernel_ipsec_t, flush_policies, status_t,
2628 private_kernel_netlink_ipsec_t *this)
2629 {
2630 netlink_buf_t request;
2631 struct nlmsghdr *hdr;
2632
2633 memset(&request, 0, sizeof(request));
2634
2635 DBG2(DBG_KNL, "flushing all policies from SPD");
2636
2637 hdr = (struct nlmsghdr*)request;
2638 hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
2639 hdr->nlmsg_type = XFRM_MSG_FLUSHPOLICY;
2640 hdr->nlmsg_len = NLMSG_LENGTH(0); /* no data associated */
2641
2642 /* by adding an rtattr of type XFRMA_POLICY_TYPE we could restrict this
2643 * to main or sub policies (default is main) */
2644
2645 if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
2646 {
2647 DBG1(DBG_KNL, "unable to flush SPD entries");
2648 return FAILED;
2649 }
2650 return SUCCESS;
2651 }
2652
2653
2654 METHOD(kernel_ipsec_t, bypass_socket, bool,
2655 private_kernel_netlink_ipsec_t *this, int fd, int family)
2656 {
2657 struct xfrm_userpolicy_info policy;
2658 u_int sol, ipsec_policy;
2659
2660 switch (family)
2661 {
2662 case AF_INET:
2663 sol = SOL_IP;
2664 ipsec_policy = IP_XFRM_POLICY;
2665 break;
2666 case AF_INET6:
2667 sol = SOL_IPV6;
2668 ipsec_policy = IPV6_XFRM_POLICY;
2669 break;
2670 default:
2671 return FALSE;
2672 }
2673
2674 memset(&policy, 0, sizeof(policy));
2675 policy.action = XFRM_POLICY_ALLOW;
2676 policy.sel.family = family;
2677
2678 policy.dir = XFRM_POLICY_OUT;
2679 if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0)
2680 {
2681 DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s",
2682 strerror(errno));
2683 return FALSE;
2684 }
2685 policy.dir = XFRM_POLICY_IN;
2686 if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0)
2687 {
2688 DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s",
2689 strerror(errno));
2690 return FALSE;
2691 }
2692 return TRUE;
2693 }
2694
2695 METHOD(kernel_ipsec_t, enable_udp_decap, bool,
2696 private_kernel_netlink_ipsec_t *this, int fd, int family, u_int16_t port)
2697 {
2698 int type = UDP_ENCAP_ESPINUDP;
2699
2700 if (setsockopt(fd, SOL_UDP, UDP_ENCAP, &type, sizeof(type)) < 0)
2701 {
2702 DBG1(DBG_KNL, "unable to set UDP_ENCAP: %s", strerror(errno));
2703 return FALSE;
2704 }
2705 return TRUE;
2706 }
2707
2708 METHOD(kernel_ipsec_t, destroy, void,
2709 private_kernel_netlink_ipsec_t *this)
2710 {
2711 enumerator_t *enumerator;
2712 policy_entry_t *policy;
2713
2714 if (this->socket_xfrm_events > 0)
2715 {
2716 close(this->socket_xfrm_events);
2717 }
2718 DESTROY_IF(this->socket_xfrm);
2719 enumerator = this->policies->create_enumerator(this->policies);
2720 while (enumerator->enumerate(enumerator, &policy, &policy))
2721 {
2722 policy_entry_destroy(this, policy);
2723 }
2724 enumerator->destroy(enumerator);
2725 this->policies->destroy(this->policies);
2726 this->sas->destroy(this->sas);
2727 this->mutex->destroy(this->mutex);
2728 free(this);
2729 }
2730
2731 /*
2732 * Described in header.
2733 */
2734 kernel_netlink_ipsec_t *kernel_netlink_ipsec_create()
2735 {
2736 private_kernel_netlink_ipsec_t *this;
2737 bool register_for_events = TRUE;
2738 int fd;
2739
2740 INIT(this,
2741 .public = {
2742 .interface = {
2743 .get_features = _get_features,
2744 .get_spi = _get_spi,
2745 .get_cpi = _get_cpi,
2746 .add_sa = _add_sa,
2747 .update_sa = _update_sa,
2748 .query_sa = _query_sa,
2749 .del_sa = _del_sa,
2750 .flush_sas = _flush_sas,
2751 .add_policy = _add_policy,
2752 .query_policy = _query_policy,
2753 .del_policy = _del_policy,
2754 .flush_policies = _flush_policies,
2755 .bypass_socket = _bypass_socket,
2756 .enable_udp_decap = _enable_udp_decap,
2757 .destroy = _destroy,
2758 },
2759 },
2760 .policies = hashtable_create((hashtable_hash_t)policy_hash,
2761 (hashtable_equals_t)policy_equals, 32),
2762 .sas = hashtable_create((hashtable_hash_t)ipsec_sa_hash,
2763 (hashtable_equals_t)ipsec_sa_equals, 32),
2764 .mutex = mutex_create(MUTEX_TYPE_DEFAULT),
2765 .policy_history = TRUE,
2766 .install_routes = lib->settings->get_bool(lib->settings,
2767 "%s.install_routes", TRUE, hydra->daemon),
2768 .replay_window = lib->settings->get_int(lib->settings,
2769 "%s.replay_window", DEFAULT_REPLAY_WINDOW, hydra->daemon),
2770 );
2771
2772 this->replay_bmp = (this->replay_window + sizeof(u_int32_t) * 8 - 1) /
2773 (sizeof(u_int32_t) * 8);
2774
2775 if (streq(hydra->daemon, "pluto"))
2776 { /* no routes for pluto, they are installed via updown script */
2777 this->install_routes = FALSE;
2778 /* no policy history for pluto */
2779 this->policy_history = FALSE;
2780 }
2781 else if (streq(hydra->daemon, "starter"))
2782 { /* starter has no threads, so we do not register for kernel events */
2783 register_for_events = FALSE;
2784 }
2785
2786 /* disable lifetimes for allocated SPIs in kernel */
2787 fd = open("/proc/sys/net/core/xfrm_acq_expires", O_WRONLY);
2788 if (fd > 0)
2789 {
2790 ignore_result(write(fd, "165", 3));
2791 close(fd);
2792 }
2793
2794 this->socket_xfrm = netlink_socket_create(NETLINK_XFRM);
2795 if (!this->socket_xfrm)
2796 {
2797 destroy(this);
2798 return NULL;
2799 }
2800
2801 if (register_for_events)
2802 {
2803 struct sockaddr_nl addr;
2804
2805 memset(&addr, 0, sizeof(addr));
2806 addr.nl_family = AF_NETLINK;
2807
2808 /* create and bind XFRM socket for ACQUIRE, EXPIRE, MIGRATE & MAPPING */
2809 this->socket_xfrm_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_XFRM);
2810 if (this->socket_xfrm_events <= 0)
2811 {
2812 DBG1(DBG_KNL, "unable to create XFRM event socket");
2813 destroy(this);
2814 return NULL;
2815 }
2816 addr.nl_groups = XFRMNLGRP(ACQUIRE) | XFRMNLGRP(EXPIRE) |
2817 XFRMNLGRP(MIGRATE) | XFRMNLGRP(MAPPING);
2818 if (bind(this->socket_xfrm_events, (struct sockaddr*)&addr, sizeof(addr)))
2819 {
2820 DBG1(DBG_KNL, "unable to bind XFRM event socket");
2821 destroy(this);
2822 return NULL;
2823 }
2824 lib->processor->queue_job(lib->processor,
2825 (job_t*)callback_job_create_with_prio(
2826 (callback_job_cb_t)receive_events, this, NULL,
2827 (callback_job_cancel_t)return_false, JOB_PRIO_CRITICAL));
2828 }
2829
2830 return &this->public;
2831 }
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