1 /* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /*
35 * This code is referd to RFC 2367
36 */
37
38 #include "opt_inet.h"
39 #include "opt_inet6.h"
40 #include "opt_ipsec.h"
41
42 #include <sys/types.h>
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/kernel.h>
46 #include <sys/fnv_hash.h>
47 #include <sys/lock.h>
48 #include <sys/mutex.h>
49 #include <sys/mbuf.h>
50 #include <sys/domain.h>
51 #include <sys/protosw.h>
52 #include <sys/malloc.h>
53 #include <sys/rmlock.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
56 #include <sys/sysctl.h>
57 #include <sys/errno.h>
58 #include <sys/proc.h>
59 #include <sys/queue.h>
60 #include <sys/refcount.h>
61 #include <sys/syslog.h>
62
63 #include <vm/uma.h>
64
65 #include <net/if.h>
66 #include <net/if_var.h>
67 #include <net/vnet.h>
68 #include <net/raw_cb.h>
69
70 #include <netinet/in.h>
71 #include <netinet/in_systm.h>
72 #include <netinet/ip.h>
73 #include <netinet/in_var.h>
74 #include <netinet/udp.h>
75
76 #ifdef INET6
77 #include <netinet/ip6.h>
78 #include <netinet6/in6_var.h>
79 #include <netinet6/ip6_var.h>
80 #endif /* INET6 */
81
82 #include <net/pfkeyv2.h>
83 #include <netipsec/keydb.h>
84 #include <netipsec/key.h>
85 #include <netipsec/keysock.h>
86 #include <netipsec/key_debug.h>
87
88 #include <netipsec/ipsec.h>
89 #ifdef INET6
90 #include <netipsec/ipsec6.h>
91 #endif
92
93 #include <netipsec/xform.h>
94 #include <machine/in_cksum.h>
95 #include <machine/stdarg.h>
96
97 /* randomness */
98 #include <sys/random.h>
99
100 #define FULLMASK 0xff
101 #define _BITS(bytes) ((bytes) << 3)
102
103 #define UINT32_80PCT 0xcccccccc
104 /*
105 * Note on SA reference counting:
106 * - SAs that are not in DEAD state will have (total external reference + 1)
107 * following value in reference count field. they cannot be freed and are
108 * referenced from SA header.
109 * - SAs that are in DEAD state will have (total external reference)
110 * in reference count field. they are ready to be freed. reference from
111 * SA header will be removed in key_delsav(), when the reference count
112 * field hits 0 (= no external reference other than from SA header.
113 */
114
115 VNET_DEFINE(u_int32_t, key_debug_level) = 0;
116 VNET_DEFINE_STATIC(u_int, key_spi_trycnt) = 1000;
117 VNET_DEFINE_STATIC(u_int32_t, key_spi_minval) = 0x100;
118 VNET_DEFINE_STATIC(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */
119 VNET_DEFINE_STATIC(u_int32_t, policy_id) = 0;
120 /*interval to initialize randseed,1(m)*/
121 VNET_DEFINE_STATIC(u_int, key_int_random) = 60;
122 /* interval to expire acquiring, 30(s)*/
123 VNET_DEFINE_STATIC(u_int, key_larval_lifetime) = 30;
124 /* counter for blocking SADB_ACQUIRE.*/
125 VNET_DEFINE_STATIC(int, key_blockacq_count) = 10;
126 /* lifetime for blocking SADB_ACQUIRE.*/
127 VNET_DEFINE_STATIC(int, key_blockacq_lifetime) = 20;
128 /* preferred old sa rather than new sa.*/
129 VNET_DEFINE_STATIC(int, key_preferred_oldsa) = 1;
130 #define V_key_spi_trycnt VNET(key_spi_trycnt)
131 #define V_key_spi_minval VNET(key_spi_minval)
132 #define V_key_spi_maxval VNET(key_spi_maxval)
133 #define V_policy_id VNET(policy_id)
134 #define V_key_int_random VNET(key_int_random)
135 #define V_key_larval_lifetime VNET(key_larval_lifetime)
136 #define V_key_blockacq_count VNET(key_blockacq_count)
137 #define V_key_blockacq_lifetime VNET(key_blockacq_lifetime)
138 #define V_key_preferred_oldsa VNET(key_preferred_oldsa)
139
140 VNET_DEFINE_STATIC(u_int32_t, acq_seq) = 0;
141 #define V_acq_seq VNET(acq_seq)
142
143 VNET_DEFINE_STATIC(uint32_t, sp_genid) = 0;
144 #define V_sp_genid VNET(sp_genid)
145
146 /* SPD */
147 TAILQ_HEAD(secpolicy_queue, secpolicy);
148 LIST_HEAD(secpolicy_list, secpolicy);
149 VNET_DEFINE_STATIC(struct secpolicy_queue, sptree[IPSEC_DIR_MAX]);
150 VNET_DEFINE_STATIC(struct secpolicy_queue, sptree_ifnet[IPSEC_DIR_MAX]);
151 static struct rmlock sptree_lock;
152 #define V_sptree VNET(sptree)
153 #define V_sptree_ifnet VNET(sptree_ifnet)
154 #define SPTREE_LOCK_INIT() rm_init(&sptree_lock, "sptree")
155 #define SPTREE_LOCK_DESTROY() rm_destroy(&sptree_lock)
156 #define SPTREE_RLOCK_TRACKER struct rm_priotracker sptree_tracker
157 #define SPTREE_RLOCK() rm_rlock(&sptree_lock, &sptree_tracker)
158 #define SPTREE_RUNLOCK() rm_runlock(&sptree_lock, &sptree_tracker)
159 #define SPTREE_RLOCK_ASSERT() rm_assert(&sptree_lock, RA_RLOCKED)
160 #define SPTREE_WLOCK() rm_wlock(&sptree_lock)
161 #define SPTREE_WUNLOCK() rm_wunlock(&sptree_lock)
162 #define SPTREE_WLOCK_ASSERT() rm_assert(&sptree_lock, RA_WLOCKED)
163 #define SPTREE_UNLOCK_ASSERT() rm_assert(&sptree_lock, RA_UNLOCKED)
164
165 /* Hash table for lookup SP using unique id */
166 VNET_DEFINE_STATIC(struct secpolicy_list *, sphashtbl);
167 VNET_DEFINE_STATIC(u_long, sphash_mask);
168 #define V_sphashtbl VNET(sphashtbl)
169 #define V_sphash_mask VNET(sphash_mask)
170
171 #define SPHASH_NHASH_LOG2 7
172 #define SPHASH_NHASH (1 << SPHASH_NHASH_LOG2)
173 #define SPHASH_HASHVAL(id) (key_u32hash(id) & V_sphash_mask)
174 #define SPHASH_HASH(id) &V_sphashtbl[SPHASH_HASHVAL(id)]
175
176 /* SPD cache */
177 struct spdcache_entry {
178 struct secpolicyindex spidx; /* secpolicyindex */
179 struct secpolicy *sp; /* cached policy to be used */
180
181 LIST_ENTRY(spdcache_entry) chain;
182 };
183 LIST_HEAD(spdcache_entry_list, spdcache_entry);
184
185 #define SPDCACHE_MAX_ENTRIES_PER_HASH 8
186
187 VNET_DEFINE_STATIC(u_int, key_spdcache_maxentries) = 0;
188 #define V_key_spdcache_maxentries VNET(key_spdcache_maxentries)
189 VNET_DEFINE_STATIC(u_int, key_spdcache_threshold) = 32;
190 #define V_key_spdcache_threshold VNET(key_spdcache_threshold)
191 VNET_DEFINE_STATIC(unsigned long, spd_size) = 0;
192 #define V_spd_size VNET(spd_size)
193
194 #define SPDCACHE_ENABLED() (V_key_spdcache_maxentries != 0)
195 #define SPDCACHE_ACTIVE() \
196 (SPDCACHE_ENABLED() && V_spd_size >= V_key_spdcache_threshold)
197
198 VNET_DEFINE_STATIC(struct spdcache_entry_list *, spdcachehashtbl);
199 VNET_DEFINE_STATIC(u_long, spdcachehash_mask);
200 #define V_spdcachehashtbl VNET(spdcachehashtbl)
201 #define V_spdcachehash_mask VNET(spdcachehash_mask)
202
203 #define SPDCACHE_HASHVAL(idx) \
204 (key_addrprotohash(&(idx)->src, &(idx)->dst, &(idx)->ul_proto) & \
205 V_spdcachehash_mask)
206
207 /* Each cache line is protected by a mutex */
208 VNET_DEFINE_STATIC(struct mtx *, spdcache_lock);
209 #define V_spdcache_lock VNET(spdcache_lock)
210
211 #define SPDCACHE_LOCK_INIT(a) \
212 mtx_init(&V_spdcache_lock[a], "spdcache", \
213 "fast ipsec SPD cache", MTX_DEF|MTX_DUPOK)
214 #define SPDCACHE_LOCK_DESTROY(a) mtx_destroy(&V_spdcache_lock[a])
215 #define SPDCACHE_LOCK(a) mtx_lock(&V_spdcache_lock[a]);
216 #define SPDCACHE_UNLOCK(a) mtx_unlock(&V_spdcache_lock[a]);
217
218 /* SAD */
219 TAILQ_HEAD(secashead_queue, secashead);
220 LIST_HEAD(secashead_list, secashead);
221 VNET_DEFINE_STATIC(struct secashead_queue, sahtree);
222 static struct rmlock sahtree_lock;
223 #define V_sahtree VNET(sahtree)
224 #define SAHTREE_LOCK_INIT() rm_init(&sahtree_lock, "sahtree")
225 #define SAHTREE_LOCK_DESTROY() rm_destroy(&sahtree_lock)
226 #define SAHTREE_RLOCK_TRACKER struct rm_priotracker sahtree_tracker
227 #define SAHTREE_RLOCK() rm_rlock(&sahtree_lock, &sahtree_tracker)
228 #define SAHTREE_RUNLOCK() rm_runlock(&sahtree_lock, &sahtree_tracker)
229 #define SAHTREE_RLOCK_ASSERT() rm_assert(&sahtree_lock, RA_RLOCKED)
230 #define SAHTREE_WLOCK() rm_wlock(&sahtree_lock)
231 #define SAHTREE_WUNLOCK() rm_wunlock(&sahtree_lock)
232 #define SAHTREE_WLOCK_ASSERT() rm_assert(&sahtree_lock, RA_WLOCKED)
233 #define SAHTREE_UNLOCK_ASSERT() rm_assert(&sahtree_lock, RA_UNLOCKED)
234
235 /* Hash table for lookup in SAD using SA addresses */
236 VNET_DEFINE_STATIC(struct secashead_list *, sahaddrhashtbl);
237 VNET_DEFINE_STATIC(u_long, sahaddrhash_mask);
238 #define V_sahaddrhashtbl VNET(sahaddrhashtbl)
239 #define V_sahaddrhash_mask VNET(sahaddrhash_mask)
240
241 #define SAHHASH_NHASH_LOG2 7
242 #define SAHHASH_NHASH (1 << SAHHASH_NHASH_LOG2)
243 #define SAHADDRHASH_HASHVAL(idx) \
244 (key_addrprotohash(&(idx)->src, &(idx)->dst, &(idx)->proto) & \
245 V_sahaddrhash_mask)
246 #define SAHADDRHASH_HASH(saidx) \
247 &V_sahaddrhashtbl[SAHADDRHASH_HASHVAL(saidx)]
248
249 /* Hash table for lookup in SAD using SPI */
250 LIST_HEAD(secasvar_list, secasvar);
251 VNET_DEFINE_STATIC(struct secasvar_list *, savhashtbl);
252 VNET_DEFINE_STATIC(u_long, savhash_mask);
253 #define V_savhashtbl VNET(savhashtbl)
254 #define V_savhash_mask VNET(savhash_mask)
255 #define SAVHASH_NHASH_LOG2 7
256 #define SAVHASH_NHASH (1 << SAVHASH_NHASH_LOG2)
257 #define SAVHASH_HASHVAL(spi) (key_u32hash(spi) & V_savhash_mask)
258 #define SAVHASH_HASH(spi) &V_savhashtbl[SAVHASH_HASHVAL(spi)]
259
260 static uint32_t
key_addrprotohash(const union sockaddr_union * src,const union sockaddr_union * dst,const uint8_t * proto)261 key_addrprotohash(const union sockaddr_union *src,
262 const union sockaddr_union *dst, const uint8_t *proto)
263 {
264 uint32_t hval;
265
266 hval = fnv_32_buf(proto, sizeof(*proto),
267 FNV1_32_INIT);
268 switch (dst->sa.sa_family) {
269 #ifdef INET
270 case AF_INET:
271 hval = fnv_32_buf(&src->sin.sin_addr,
272 sizeof(in_addr_t), hval);
273 hval = fnv_32_buf(&dst->sin.sin_addr,
274 sizeof(in_addr_t), hval);
275 break;
276 #endif
277 #ifdef INET6
278 case AF_INET6:
279 hval = fnv_32_buf(&src->sin6.sin6_addr,
280 sizeof(struct in6_addr), hval);
281 hval = fnv_32_buf(&dst->sin6.sin6_addr,
282 sizeof(struct in6_addr), hval);
283 break;
284 #endif
285 default:
286 hval = 0;
287 ipseclog((LOG_DEBUG, "%s: unknown address family %d\n",
288 __func__, dst->sa.sa_family));
289 }
290 return (hval);
291 }
292
293 static uint32_t
key_u32hash(uint32_t val)294 key_u32hash(uint32_t val)
295 {
296
297 return (fnv_32_buf(&val, sizeof(val), FNV1_32_INIT));
298 }
299
300 /* registed list */
301 VNET_DEFINE_STATIC(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]);
302 #define V_regtree VNET(regtree)
303 static struct mtx regtree_lock;
304 #define REGTREE_LOCK_INIT() \
305 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF)
306 #define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock)
307 #define REGTREE_LOCK() mtx_lock(®tree_lock)
308 #define REGTREE_UNLOCK() mtx_unlock(®tree_lock)
309 #define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED)
310
311 /* Acquiring list */
312 LIST_HEAD(secacq_list, secacq);
313 VNET_DEFINE_STATIC(struct secacq_list, acqtree);
314 #define V_acqtree VNET(acqtree)
315 static struct mtx acq_lock;
316 #define ACQ_LOCK_INIT() \
317 mtx_init(&acq_lock, "acqtree", "ipsec SA acquiring list", MTX_DEF)
318 #define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock)
319 #define ACQ_LOCK() mtx_lock(&acq_lock)
320 #define ACQ_UNLOCK() mtx_unlock(&acq_lock)
321 #define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED)
322
323 /* Hash table for lookup in ACQ list using SA addresses */
324 VNET_DEFINE_STATIC(struct secacq_list *, acqaddrhashtbl);
325 VNET_DEFINE_STATIC(u_long, acqaddrhash_mask);
326 #define V_acqaddrhashtbl VNET(acqaddrhashtbl)
327 #define V_acqaddrhash_mask VNET(acqaddrhash_mask)
328
329 /* Hash table for lookup in ACQ list using SEQ number */
330 VNET_DEFINE_STATIC(struct secacq_list *, acqseqhashtbl);
331 VNET_DEFINE_STATIC(u_long, acqseqhash_mask);
332 #define V_acqseqhashtbl VNET(acqseqhashtbl)
333 #define V_acqseqhash_mask VNET(acqseqhash_mask)
334
335 #define ACQHASH_NHASH_LOG2 7
336 #define ACQHASH_NHASH (1 << ACQHASH_NHASH_LOG2)
337 #define ACQADDRHASH_HASHVAL(idx) \
338 (key_addrprotohash(&(idx)->src, &(idx)->dst, &(idx)->proto) & \
339 V_acqaddrhash_mask)
340 #define ACQSEQHASH_HASHVAL(seq) \
341 (key_u32hash(seq) & V_acqseqhash_mask)
342 #define ACQADDRHASH_HASH(saidx) \
343 &V_acqaddrhashtbl[ACQADDRHASH_HASHVAL(saidx)]
344 #define ACQSEQHASH_HASH(seq) \
345 &V_acqseqhashtbl[ACQSEQHASH_HASHVAL(seq)]
346 /* SP acquiring list */
347 VNET_DEFINE_STATIC(LIST_HEAD(_spacqtree, secspacq), spacqtree);
348 #define V_spacqtree VNET(spacqtree)
349 static struct mtx spacq_lock;
350 #define SPACQ_LOCK_INIT() \
351 mtx_init(&spacq_lock, "spacqtree", \
352 "fast ipsec security policy acquire list", MTX_DEF)
353 #define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock)
354 #define SPACQ_LOCK() mtx_lock(&spacq_lock)
355 #define SPACQ_UNLOCK() mtx_unlock(&spacq_lock)
356 #define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED)
357
358 static const int minsize[] = {
359 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
360 sizeof(struct sadb_sa), /* SADB_EXT_SA */
361 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
362 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
363 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
364 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */
365 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */
366 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */
367 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */
368 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */
369 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */
370 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */
371 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */
372 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */
373 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */
374 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */
375 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
376 0, /* SADB_X_EXT_KMPRIVATE */
377 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */
378 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
379 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */
380 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */
381 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */
382 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAI */
383 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAR */
384 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */
385 sizeof(struct sadb_x_sa_replay), /* SADB_X_EXT_SA_REPLAY */
386 sizeof(struct sadb_address), /* SADB_X_EXT_NEW_ADDRESS_SRC */
387 sizeof(struct sadb_address), /* SADB_X_EXT_NEW_ADDRESS_DST */
388 };
389 _Static_assert(sizeof(minsize)/sizeof(int) == SADB_EXT_MAX + 1, "minsize size mismatch");
390
391 static const int maxsize[] = {
392 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
393 sizeof(struct sadb_sa), /* SADB_EXT_SA */
394 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
395 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
396 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
397 0, /* SADB_EXT_ADDRESS_SRC */
398 0, /* SADB_EXT_ADDRESS_DST */
399 0, /* SADB_EXT_ADDRESS_PROXY */
400 0, /* SADB_EXT_KEY_AUTH */
401 0, /* SADB_EXT_KEY_ENCRYPT */
402 0, /* SADB_EXT_IDENTITY_SRC */
403 0, /* SADB_EXT_IDENTITY_DST */
404 0, /* SADB_EXT_SENSITIVITY */
405 0, /* SADB_EXT_PROPOSAL */
406 0, /* SADB_EXT_SUPPORTED_AUTH */
407 0, /* SADB_EXT_SUPPORTED_ENCRYPT */
408 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
409 0, /* SADB_X_EXT_KMPRIVATE */
410 0, /* SADB_X_EXT_POLICY */
411 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
412 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */
413 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */
414 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */
415 0, /* SADB_X_EXT_NAT_T_OAI */
416 0, /* SADB_X_EXT_NAT_T_OAR */
417 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */
418 sizeof(struct sadb_x_sa_replay), /* SADB_X_EXT_SA_REPLAY */
419 0, /* SADB_X_EXT_NEW_ADDRESS_SRC */
420 0, /* SADB_X_EXT_NEW_ADDRESS_DST */
421 };
422 _Static_assert(sizeof(maxsize)/sizeof(int) == SADB_EXT_MAX + 1, "minsize size mismatch");
423
424 /*
425 * Internal values for SA flags:
426 * SADB_X_EXT_F_CLONED means that SA was cloned by key_updateaddresses,
427 * thus we will not free the most of SA content in key_delsav().
428 */
429 #define SADB_X_EXT_F_CLONED 0x80000000
430
431 #define SADB_CHECKLEN(_mhp, _ext) \
432 ((_mhp)->extlen[(_ext)] < minsize[(_ext)] || (maxsize[(_ext)] != 0 && \
433 ((_mhp)->extlen[(_ext)] > maxsize[(_ext)])))
434 #define SADB_CHECKHDR(_mhp, _ext) ((_mhp)->ext[(_ext)] == NULL)
435
436 VNET_DEFINE_STATIC(int, ipsec_esp_keymin) = 256;
437 VNET_DEFINE_STATIC(int, ipsec_esp_auth) = 0;
438 VNET_DEFINE_STATIC(int, ipsec_ah_keymin) = 128;
439
440 #define V_ipsec_esp_keymin VNET(ipsec_esp_keymin)
441 #define V_ipsec_esp_auth VNET(ipsec_esp_auth)
442 #define V_ipsec_ah_keymin VNET(ipsec_ah_keymin)
443
444 #ifdef IPSEC_DEBUG
445 VNET_DEFINE(int, ipsec_debug) = 1;
446 #else
447 VNET_DEFINE(int, ipsec_debug) = 0;
448 #endif
449
450 #ifdef INET
451 SYSCTL_DECL(_net_inet_ipsec);
452 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, debug,
453 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_debug), 0,
454 "Enable IPsec debugging output when set.");
455 #endif
456 #ifdef INET6
457 SYSCTL_DECL(_net_inet6_ipsec6);
458 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, debug,
459 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_debug), 0,
460 "Enable IPsec debugging output when set.");
461 #endif
462
463 SYSCTL_DECL(_net_key);
464 SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug,
465 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_debug_level), 0, "");
466
467 /* max count of trial for the decision of spi value */
468 SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt,
469 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_trycnt), 0, "");
470
471 /* minimum spi value to allocate automatically. */
472 SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval,
473 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_minval), 0, "");
474
475 /* maximun spi value to allocate automatically. */
476 SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval,
477 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_maxval), 0, "");
478
479 /* interval to initialize randseed */
480 SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random,
481 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_int_random), 0, "");
482
483 /* lifetime for larval SA */
484 SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime,
485 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_larval_lifetime), 0, "");
486
487 /* counter for blocking to send SADB_ACQUIRE to IKEd */
488 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count,
489 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_count), 0, "");
490
491 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */
492 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime,
493 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, "");
494
495 /* ESP auth */
496 SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth,
497 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, "");
498
499 /* minimum ESP key length */
500 SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin,
501 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, "");
502
503 /* minimum AH key length */
504 SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin,
505 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_ah_keymin), 0, "");
506
507 /* perfered old SA rather than new SA */
508 SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, preferred_oldsa,
509 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_preferred_oldsa), 0, "");
510
511 static SYSCTL_NODE(_net_key, OID_AUTO, spdcache,
512 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
513 "SPD cache");
514
515 SYSCTL_UINT(_net_key_spdcache, OID_AUTO, maxentries,
516 CTLFLAG_VNET | CTLFLAG_RDTUN, &VNET_NAME(key_spdcache_maxentries), 0,
517 "Maximum number of entries in the SPD cache"
518 " (power of 2, 0 to disable)");
519
520 SYSCTL_UINT(_net_key_spdcache, OID_AUTO, threshold,
521 CTLFLAG_VNET | CTLFLAG_RDTUN, &VNET_NAME(key_spdcache_threshold), 0,
522 "Number of SPs that make the SPD cache active");
523
524 #define __LIST_CHAINED(elm) \
525 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL))
526
527 MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association");
528 MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head");
529 MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy");
530 MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request");
531 MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous");
532 MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire");
533 MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire");
534 MALLOC_DEFINE(M_IPSEC_SPDCACHE, "ipsec-spdcache", "ipsec SPD cache");
535
536 VNET_DEFINE_STATIC(uma_zone_t, key_lft_zone);
537 #define V_key_lft_zone VNET(key_lft_zone)
538
539 /*
540 * set parameters into secpolicyindex buffer.
541 * Must allocate secpolicyindex buffer passed to this function.
542 */
543 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \
544 do { \
545 bzero((idx), sizeof(struct secpolicyindex)); \
546 (idx)->dir = (_dir); \
547 (idx)->prefs = (ps); \
548 (idx)->prefd = (pd); \
549 (idx)->ul_proto = (ulp); \
550 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
551 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
552 } while (0)
553
554 /*
555 * set parameters into secasindex buffer.
556 * Must allocate secasindex buffer before calling this function.
557 */
558 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \
559 do { \
560 bzero((idx), sizeof(struct secasindex)); \
561 (idx)->proto = (p); \
562 (idx)->mode = (m); \
563 (idx)->reqid = (r); \
564 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
565 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
566 key_porttosaddr(&(idx)->src.sa, 0); \
567 key_porttosaddr(&(idx)->dst.sa, 0); \
568 } while (0)
569
570 /* key statistics */
571 struct _keystat {
572 u_long getspi_count; /* the avarage of count to try to get new SPI */
573 } keystat;
574
575 struct sadb_msghdr {
576 struct sadb_msg *msg;
577 struct sadb_ext *ext[SADB_EXT_MAX + 1];
578 int extoff[SADB_EXT_MAX + 1];
579 int extlen[SADB_EXT_MAX + 1];
580 };
581
582 static const struct supported_ealgs {
583 int sadb_alg;
584 const struct enc_xform *xform;
585 } supported_ealgs[] = {
586 { SADB_X_EALG_AES, &enc_xform_rijndael128 },
587 { SADB_EALG_NULL, &enc_xform_null },
588 { SADB_X_EALG_AESCTR, &enc_xform_aes_icm },
589 { SADB_X_EALG_AESGCM16, &enc_xform_aes_nist_gcm },
590 { SADB_X_EALG_AESGMAC, &enc_xform_aes_nist_gmac },
591 };
592
593 static const struct supported_aalgs {
594 int sadb_alg;
595 const struct auth_hash *xform;
596 } supported_aalgs[] = {
597 { SADB_X_AALG_NULL, &auth_hash_null },
598 { SADB_AALG_SHA1HMAC, &auth_hash_hmac_sha1 },
599 { SADB_X_AALG_SHA2_256, &auth_hash_hmac_sha2_256 },
600 { SADB_X_AALG_SHA2_384, &auth_hash_hmac_sha2_384 },
601 { SADB_X_AALG_SHA2_512, &auth_hash_hmac_sha2_512 },
602 { SADB_X_AALG_AES128GMAC, &auth_hash_nist_gmac_aes_128 },
603 { SADB_X_AALG_AES192GMAC, &auth_hash_nist_gmac_aes_192 },
604 { SADB_X_AALG_AES256GMAC, &auth_hash_nist_gmac_aes_256 },
605 };
606
607 static const struct supported_calgs {
608 int sadb_alg;
609 const struct comp_algo *xform;
610 } supported_calgs[] = {
611 { SADB_X_CALG_DEFLATE, &comp_algo_deflate },
612 };
613
614 #ifndef IPSEC_DEBUG2
615 static struct callout key_timer;
616 #endif
617
618 static void key_unlink(struct secpolicy *);
619 static struct secpolicy *key_do_allocsp(struct secpolicyindex *spidx, u_int dir);
620 static struct secpolicy *key_getsp(struct secpolicyindex *);
621 static struct secpolicy *key_getspbyid(u_int32_t);
622 static struct mbuf *key_gather_mbuf(struct mbuf *,
623 const struct sadb_msghdr *, int, int, ...);
624 static int key_spdadd(struct socket *, struct mbuf *,
625 const struct sadb_msghdr *);
626 static uint32_t key_getnewspid(void);
627 static int key_spddelete(struct socket *, struct mbuf *,
628 const struct sadb_msghdr *);
629 static int key_spddelete2(struct socket *, struct mbuf *,
630 const struct sadb_msghdr *);
631 static int key_spdget(struct socket *, struct mbuf *,
632 const struct sadb_msghdr *);
633 static int key_spdflush(struct socket *, struct mbuf *,
634 const struct sadb_msghdr *);
635 static int key_spddump(struct socket *, struct mbuf *,
636 const struct sadb_msghdr *);
637 static struct mbuf *key_setdumpsp(struct secpolicy *,
638 u_int8_t, u_int32_t, u_int32_t);
639 static struct mbuf *key_sp2mbuf(struct secpolicy *);
640 static size_t key_getspreqmsglen(struct secpolicy *);
641 static int key_spdexpire(struct secpolicy *);
642 static struct secashead *key_newsah(struct secasindex *);
643 static void key_freesah(struct secashead **);
644 static void key_delsah(struct secashead *);
645 static struct secasvar *key_newsav(const struct sadb_msghdr *,
646 struct secasindex *, uint32_t, int *);
647 static void key_delsav(struct secasvar *);
648 static void key_unlinksav(struct secasvar *);
649 static struct secashead *key_getsah(struct secasindex *);
650 static int key_checkspidup(uint32_t);
651 static struct secasvar *key_getsavbyspi(uint32_t);
652 static int key_setnatt(struct secasvar *, const struct sadb_msghdr *);
653 static int key_setsaval(struct secasvar *, const struct sadb_msghdr *);
654 static int key_updatelifetimes(struct secasvar *, const struct sadb_msghdr *);
655 static int key_updateaddresses(struct socket *, struct mbuf *,
656 const struct sadb_msghdr *, struct secasvar *, struct secasindex *);
657
658 static struct mbuf *key_setdumpsa(struct secasvar *, u_int8_t,
659 u_int8_t, u_int32_t, u_int32_t);
660 static struct mbuf *key_setsadbmsg(u_int8_t, u_int16_t, u_int8_t,
661 u_int32_t, pid_t, u_int16_t);
662 static struct mbuf *key_setsadbsa(struct secasvar *);
663 static struct mbuf *key_setsadbaddr(u_int16_t,
664 const struct sockaddr *, u_int8_t, u_int16_t);
665 static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t);
666 static struct mbuf *key_setsadbxtype(u_int16_t);
667 static struct mbuf *key_setsadbxsa2(u_int8_t, u_int32_t, u_int32_t);
668 static struct mbuf *key_setsadbxsareplay(u_int32_t);
669 static struct mbuf *key_setsadbxpolicy(u_int16_t, u_int8_t,
670 u_int32_t, u_int32_t);
671 static struct seckey *key_dup_keymsg(const struct sadb_key *,
672 struct malloc_type *);
673 static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src,
674 struct malloc_type *);
675
676 /* flags for key_cmpsaidx() */
677 #define CMP_HEAD 1 /* protocol, addresses. */
678 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */
679 #define CMP_REQID 3 /* additionally HEAD, reaid. */
680 #define CMP_EXACTLY 4 /* all elements. */
681 static int key_cmpsaidx(const struct secasindex *,
682 const struct secasindex *, int);
683 static int key_cmpspidx_exactly(struct secpolicyindex *,
684 struct secpolicyindex *);
685 static int key_cmpspidx_withmask(struct secpolicyindex *,
686 struct secpolicyindex *);
687 static int key_bbcmp(const void *, const void *, u_int);
688 static uint8_t key_satype2proto(uint8_t);
689 static uint8_t key_proto2satype(uint8_t);
690
691 static int key_getspi(struct socket *, struct mbuf *,
692 const struct sadb_msghdr *);
693 static uint32_t key_do_getnewspi(struct sadb_spirange *, struct secasindex *);
694 static int key_update(struct socket *, struct mbuf *,
695 const struct sadb_msghdr *);
696 static int key_add(struct socket *, struct mbuf *,
697 const struct sadb_msghdr *);
698 static int key_setident(struct secashead *, const struct sadb_msghdr *);
699 static struct mbuf *key_getmsgbuf_x1(struct mbuf *,
700 const struct sadb_msghdr *);
701 static int key_delete(struct socket *, struct mbuf *,
702 const struct sadb_msghdr *);
703 static int key_delete_all(struct socket *, struct mbuf *,
704 const struct sadb_msghdr *, struct secasindex *);
705 static int key_get(struct socket *, struct mbuf *,
706 const struct sadb_msghdr *);
707
708 static void key_getcomb_setlifetime(struct sadb_comb *);
709 static struct mbuf *key_getcomb_ealg(void);
710 static struct mbuf *key_getcomb_ah(void);
711 static struct mbuf *key_getcomb_ipcomp(void);
712 static struct mbuf *key_getprop(const struct secasindex *);
713
714 static int key_acquire(const struct secasindex *, struct secpolicy *);
715 static uint32_t key_newacq(const struct secasindex *, int *);
716 static uint32_t key_getacq(const struct secasindex *, int *);
717 static int key_acqdone(const struct secasindex *, uint32_t);
718 static int key_acqreset(uint32_t);
719 static struct secspacq *key_newspacq(struct secpolicyindex *);
720 static struct secspacq *key_getspacq(struct secpolicyindex *);
721 static int key_acquire2(struct socket *, struct mbuf *,
722 const struct sadb_msghdr *);
723 static int key_register(struct socket *, struct mbuf *,
724 const struct sadb_msghdr *);
725 static int key_expire(struct secasvar *, int);
726 static int key_flush(struct socket *, struct mbuf *,
727 const struct sadb_msghdr *);
728 static int key_dump(struct socket *, struct mbuf *,
729 const struct sadb_msghdr *);
730 static int key_promisc(struct socket *, struct mbuf *,
731 const struct sadb_msghdr *);
732 static int key_senderror(struct socket *, struct mbuf *, int);
733 static int key_validate_ext(const struct sadb_ext *, int);
734 static int key_align(struct mbuf *, struct sadb_msghdr *);
735 static struct mbuf *key_setlifetime(struct seclifetime *, uint16_t);
736 static struct mbuf *key_setkey(struct seckey *, uint16_t);
737
738 static void spdcache_init(void);
739 static void spdcache_clear(void);
740 static struct spdcache_entry *spdcache_entry_alloc(
741 const struct secpolicyindex *spidx,
742 struct secpolicy *policy);
743 static void spdcache_entry_free(struct spdcache_entry *entry);
744 #ifdef VIMAGE
745 static void spdcache_destroy(void);
746 #endif
747
748 #define DBG_IPSEC_INITREF(t, p) do { \
749 refcount_init(&(p)->refcnt, 1); \
750 KEYDBG(KEY_STAMP, \
751 printf("%s: Initialize refcnt %s(%p) = %u\n", \
752 __func__, #t, (p), (p)->refcnt)); \
753 } while (0)
754 #define DBG_IPSEC_ADDREF(t, p) do { \
755 refcount_acquire(&(p)->refcnt); \
756 KEYDBG(KEY_STAMP, \
757 printf("%s: Acquire refcnt %s(%p) -> %u\n", \
758 __func__, #t, (p), (p)->refcnt)); \
759 } while (0)
760 #define DBG_IPSEC_DELREF(t, p) do { \
761 KEYDBG(KEY_STAMP, \
762 printf("%s: Release refcnt %s(%p) -> %u\n", \
763 __func__, #t, (p), (p)->refcnt - 1)); \
764 refcount_release(&(p)->refcnt); \
765 } while (0)
766
767 #define IPSEC_INITREF(t, p) refcount_init(&(p)->refcnt, 1)
768 #define IPSEC_ADDREF(t, p) refcount_acquire(&(p)->refcnt)
769 #define IPSEC_DELREF(t, p) refcount_release(&(p)->refcnt)
770
771 #define SP_INITREF(p) IPSEC_INITREF(SP, p)
772 #define SP_ADDREF(p) IPSEC_ADDREF(SP, p)
773 #define SP_DELREF(p) IPSEC_DELREF(SP, p)
774
775 #define SAH_INITREF(p) IPSEC_INITREF(SAH, p)
776 #define SAH_ADDREF(p) IPSEC_ADDREF(SAH, p)
777 #define SAH_DELREF(p) IPSEC_DELREF(SAH, p)
778
779 #define SAV_INITREF(p) IPSEC_INITREF(SAV, p)
780 #define SAV_ADDREF(p) IPSEC_ADDREF(SAV, p)
781 #define SAV_DELREF(p) IPSEC_DELREF(SAV, p)
782
783 /*
784 * Update the refcnt while holding the SPTREE lock.
785 */
786 void
key_addref(struct secpolicy * sp)787 key_addref(struct secpolicy *sp)
788 {
789
790 SP_ADDREF(sp);
791 }
792
793 /*
794 * Return 0 when there are known to be no SP's for the specified
795 * direction. Otherwise return 1. This is used by IPsec code
796 * to optimize performance.
797 */
798 int
key_havesp(u_int dir)799 key_havesp(u_int dir)
800 {
801
802 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ?
803 TAILQ_FIRST(&V_sptree[dir]) != NULL : 1);
804 }
805
806 /*
807 * Allocate a single mbuf with a buffer of the desired length. The buffer is
808 * pre-zeroed to help ensure that uninitialized pad bytes are not leaked.
809 */
810 static struct mbuf *
key_mget(u_int len)811 key_mget(u_int len)
812 {
813 struct mbuf *m;
814
815 KASSERT(len <= MCLBYTES,
816 ("%s: invalid buffer length %u", __func__, len));
817
818 m = m_get2(len, M_NOWAIT, MT_DATA, M_PKTHDR);
819 if (m == NULL)
820 return (NULL);
821 memset(mtod(m, void *), 0, len);
822 return (m);
823 }
824
825 /* %%% IPsec policy management */
826 /*
827 * Return current SPDB generation.
828 */
829 uint32_t
key_getspgen(void)830 key_getspgen(void)
831 {
832
833 return (V_sp_genid);
834 }
835
836 void
key_bumpspgen(void)837 key_bumpspgen(void)
838 {
839
840 V_sp_genid++;
841 }
842
843 static int
key_checksockaddrs(struct sockaddr * src,struct sockaddr * dst)844 key_checksockaddrs(struct sockaddr *src, struct sockaddr *dst)
845 {
846
847 /* family match */
848 if (src->sa_family != dst->sa_family)
849 return (EINVAL);
850 /* sa_len match */
851 if (src->sa_len != dst->sa_len)
852 return (EINVAL);
853 switch (src->sa_family) {
854 #ifdef INET
855 case AF_INET:
856 if (src->sa_len != sizeof(struct sockaddr_in))
857 return (EINVAL);
858 break;
859 #endif
860 #ifdef INET6
861 case AF_INET6:
862 if (src->sa_len != sizeof(struct sockaddr_in6))
863 return (EINVAL);
864 break;
865 #endif
866 default:
867 return (EAFNOSUPPORT);
868 }
869 return (0);
870 }
871
872 struct secpolicy *
key_do_allocsp(struct secpolicyindex * spidx,u_int dir)873 key_do_allocsp(struct secpolicyindex *spidx, u_int dir)
874 {
875 SPTREE_RLOCK_TRACKER;
876 struct secpolicy *sp;
877
878 IPSEC_ASSERT(spidx != NULL, ("null spidx"));
879 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
880 ("invalid direction %u", dir));
881
882 SPTREE_RLOCK();
883 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
884 if (key_cmpspidx_withmask(&sp->spidx, spidx)) {
885 SP_ADDREF(sp);
886 break;
887 }
888 }
889 SPTREE_RUNLOCK();
890 return (sp);
891 }
892
893 /*
894 * allocating a SP for OUTBOUND or INBOUND packet.
895 * Must call key_freesp() later.
896 * OUT: NULL: not found
897 * others: found and return the pointer.
898 */
899 struct secpolicy *
key_allocsp(struct secpolicyindex * spidx,u_int dir)900 key_allocsp(struct secpolicyindex *spidx, u_int dir)
901 {
902 struct spdcache_entry *entry, *lastentry, *tmpentry;
903 struct secpolicy *sp;
904 uint32_t hashv;
905 int nb_entries;
906
907 if (!SPDCACHE_ACTIVE()) {
908 sp = key_do_allocsp(spidx, dir);
909 goto out;
910 }
911
912 hashv = SPDCACHE_HASHVAL(spidx);
913 SPDCACHE_LOCK(hashv);
914 nb_entries = 0;
915 LIST_FOREACH_SAFE(entry, &V_spdcachehashtbl[hashv], chain, tmpentry) {
916 /* Removed outdated entries */
917 if (entry->sp != NULL &&
918 entry->sp->state == IPSEC_SPSTATE_DEAD) {
919 LIST_REMOVE(entry, chain);
920 spdcache_entry_free(entry);
921 continue;
922 }
923
924 nb_entries++;
925 if (!key_cmpspidx_exactly(&entry->spidx, spidx)) {
926 lastentry = entry;
927 continue;
928 }
929
930 sp = entry->sp;
931 if (entry->sp != NULL)
932 SP_ADDREF(sp);
933
934 /* IPSECSTAT_INC(ips_spdcache_hits); */
935
936 SPDCACHE_UNLOCK(hashv);
937 goto out;
938 }
939
940 /* IPSECSTAT_INC(ips_spdcache_misses); */
941
942 sp = key_do_allocsp(spidx, dir);
943 entry = spdcache_entry_alloc(spidx, sp);
944 if (entry != NULL) {
945 if (nb_entries >= SPDCACHE_MAX_ENTRIES_PER_HASH) {
946 LIST_REMOVE(lastentry, chain);
947 spdcache_entry_free(lastentry);
948 }
949
950 LIST_INSERT_HEAD(&V_spdcachehashtbl[hashv], entry, chain);
951 }
952
953 SPDCACHE_UNLOCK(hashv);
954
955 out:
956 if (sp != NULL) { /* found a SPD entry */
957 sp->lastused = time_second;
958 KEYDBG(IPSEC_STAMP,
959 printf("%s: return SP(%p)\n", __func__, sp));
960 KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
961 } else {
962 KEYDBG(IPSEC_DATA,
963 printf("%s: lookup failed for ", __func__);
964 kdebug_secpolicyindex(spidx, NULL));
965 }
966 return (sp);
967 }
968
969 /*
970 * Allocating an SA entry for an *INBOUND* or *OUTBOUND* TCP packet, signed
971 * or should be signed by MD5 signature.
972 * We don't use key_allocsa() for such lookups, because we don't know SPI.
973 * Unlike ESP and AH protocols, SPI isn't transmitted in the TCP header with
974 * signed packet. We use SADB only as storage for password.
975 * OUT: positive: corresponding SA for given saidx found.
976 * NULL: SA not found
977 */
978 struct secasvar *
key_allocsa_tcpmd5(struct secasindex * saidx)979 key_allocsa_tcpmd5(struct secasindex *saidx)
980 {
981 SAHTREE_RLOCK_TRACKER;
982 struct secashead *sah;
983 struct secasvar *sav;
984
985 IPSEC_ASSERT(saidx->proto == IPPROTO_TCP,
986 ("unexpected security protocol %u", saidx->proto));
987 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TCPMD5,
988 ("unexpected mode %u", saidx->mode));
989
990 SAHTREE_RLOCK();
991 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
992 KEYDBG(IPSEC_DUMP,
993 printf("%s: checking SAH\n", __func__);
994 kdebug_secash(sah, " "));
995 if (sah->saidx.proto != IPPROTO_TCP)
996 continue;
997 if (!key_sockaddrcmp(&saidx->dst.sa, &sah->saidx.dst.sa, 0) &&
998 !key_sockaddrcmp(&saidx->src.sa, &sah->saidx.src.sa, 0))
999 break;
1000 }
1001 if (sah != NULL) {
1002 if (V_key_preferred_oldsa)
1003 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
1004 else
1005 sav = TAILQ_FIRST(&sah->savtree_alive);
1006 if (sav != NULL)
1007 SAV_ADDREF(sav);
1008 } else
1009 sav = NULL;
1010 SAHTREE_RUNLOCK();
1011
1012 if (sav != NULL) {
1013 KEYDBG(IPSEC_STAMP,
1014 printf("%s: return SA(%p)\n", __func__, sav));
1015 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1016 } else {
1017 KEYDBG(IPSEC_STAMP,
1018 printf("%s: SA not found\n", __func__));
1019 KEYDBG(IPSEC_DATA, kdebug_secasindex(saidx, NULL));
1020 }
1021 return (sav);
1022 }
1023
1024 /*
1025 * Allocating an SA entry for an *OUTBOUND* packet.
1026 * OUT: positive: corresponding SA for given saidx found.
1027 * NULL: SA not found, but will be acquired, check *error
1028 * for acquiring status.
1029 */
1030 struct secasvar *
key_allocsa_policy(struct secpolicy * sp,const struct secasindex * saidx,int * error)1031 key_allocsa_policy(struct secpolicy *sp, const struct secasindex *saidx,
1032 int *error)
1033 {
1034 SAHTREE_RLOCK_TRACKER;
1035 struct secashead *sah;
1036 struct secasvar *sav;
1037
1038 IPSEC_ASSERT(saidx != NULL, ("null saidx"));
1039 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT ||
1040 saidx->mode == IPSEC_MODE_TUNNEL,
1041 ("unexpected policy %u", saidx->mode));
1042
1043 /*
1044 * We check new SA in the IPsec request because a different
1045 * SA may be involved each time this request is checked, either
1046 * because new SAs are being configured, or this request is
1047 * associated with an unconnected datagram socket, or this request
1048 * is associated with a system default policy.
1049 */
1050 SAHTREE_RLOCK();
1051 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
1052 KEYDBG(IPSEC_DUMP,
1053 printf("%s: checking SAH\n", __func__);
1054 kdebug_secash(sah, " "));
1055 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID))
1056 break;
1057 }
1058 if (sah != NULL) {
1059 /*
1060 * Allocate the oldest SA available according to
1061 * draft-jenkins-ipsec-rekeying-03.
1062 */
1063 if (V_key_preferred_oldsa)
1064 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
1065 else
1066 sav = TAILQ_FIRST(&sah->savtree_alive);
1067 if (sav != NULL)
1068 SAV_ADDREF(sav);
1069 } else
1070 sav = NULL;
1071 SAHTREE_RUNLOCK();
1072
1073 if (sav != NULL) {
1074 *error = 0;
1075 KEYDBG(IPSEC_STAMP,
1076 printf("%s: chosen SA(%p) for SP(%p)\n", __func__,
1077 sav, sp));
1078 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1079 return (sav); /* return referenced SA */
1080 }
1081
1082 /* there is no SA */
1083 *error = key_acquire(saidx, sp);
1084 if ((*error) != 0)
1085 ipseclog((LOG_DEBUG,
1086 "%s: error %d returned from key_acquire()\n",
1087 __func__, *error));
1088 KEYDBG(IPSEC_STAMP,
1089 printf("%s: acquire SA for SP(%p), error %d\n",
1090 __func__, sp, *error));
1091 KEYDBG(IPSEC_DATA, kdebug_secasindex(saidx, NULL));
1092 return (NULL);
1093 }
1094
1095 /*
1096 * allocating a usable SA entry for a *INBOUND* packet.
1097 * Must call key_freesav() later.
1098 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state).
1099 * NULL: not found, or error occurred.
1100 *
1101 * According to RFC 2401 SA is uniquely identified by a triple SPI,
1102 * destination address, and security protocol. But according to RFC 4301,
1103 * SPI by itself suffices to specify an SA.
1104 *
1105 * Note that, however, we do need to keep source address in IPsec SA.
1106 * IKE specification and PF_KEY specification do assume that we
1107 * keep source address in IPsec SA. We see a tricky situation here.
1108 */
1109 struct secasvar *
key_allocsa(union sockaddr_union * dst,uint8_t proto,uint32_t spi)1110 key_allocsa(union sockaddr_union *dst, uint8_t proto, uint32_t spi)
1111 {
1112 SAHTREE_RLOCK_TRACKER;
1113 struct secasvar *sav;
1114
1115 IPSEC_ASSERT(proto == IPPROTO_ESP || proto == IPPROTO_AH ||
1116 proto == IPPROTO_IPCOMP, ("unexpected security protocol %u",
1117 proto));
1118
1119 SAHTREE_RLOCK();
1120 LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
1121 if (sav->spi == spi)
1122 break;
1123 }
1124 /*
1125 * We use single SPI namespace for all protocols, so it is
1126 * impossible to have SPI duplicates in the SAVHASH.
1127 */
1128 if (sav != NULL) {
1129 if (sav->state != SADB_SASTATE_LARVAL &&
1130 sav->sah->saidx.proto == proto &&
1131 key_sockaddrcmp(&dst->sa,
1132 &sav->sah->saidx.dst.sa, 0) == 0)
1133 SAV_ADDREF(sav);
1134 else
1135 sav = NULL;
1136 }
1137 SAHTREE_RUNLOCK();
1138
1139 if (sav == NULL) {
1140 KEYDBG(IPSEC_STAMP,
1141 char buf[IPSEC_ADDRSTRLEN];
1142 printf("%s: SA not found for spi %u proto %u dst %s\n",
1143 __func__, ntohl(spi), proto, ipsec_address(dst, buf,
1144 sizeof(buf))));
1145 } else {
1146 KEYDBG(IPSEC_STAMP,
1147 printf("%s: return SA(%p)\n", __func__, sav));
1148 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1149 }
1150 return (sav);
1151 }
1152
1153 struct secasvar *
key_allocsa_tunnel(union sockaddr_union * src,union sockaddr_union * dst,uint8_t proto)1154 key_allocsa_tunnel(union sockaddr_union *src, union sockaddr_union *dst,
1155 uint8_t proto)
1156 {
1157 SAHTREE_RLOCK_TRACKER;
1158 struct secasindex saidx;
1159 struct secashead *sah;
1160 struct secasvar *sav;
1161
1162 IPSEC_ASSERT(src != NULL, ("null src address"));
1163 IPSEC_ASSERT(dst != NULL, ("null dst address"));
1164
1165 KEY_SETSECASIDX(proto, IPSEC_MODE_TUNNEL, 0, &src->sa,
1166 &dst->sa, &saidx);
1167
1168 sav = NULL;
1169 SAHTREE_RLOCK();
1170 LIST_FOREACH(sah, SAHADDRHASH_HASH(&saidx), addrhash) {
1171 if (IPSEC_MODE_TUNNEL != sah->saidx.mode)
1172 continue;
1173 if (proto != sah->saidx.proto)
1174 continue;
1175 if (key_sockaddrcmp(&src->sa, &sah->saidx.src.sa, 0) != 0)
1176 continue;
1177 if (key_sockaddrcmp(&dst->sa, &sah->saidx.dst.sa, 0) != 0)
1178 continue;
1179 /* XXXAE: is key_preferred_oldsa reasonably?*/
1180 if (V_key_preferred_oldsa)
1181 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
1182 else
1183 sav = TAILQ_FIRST(&sah->savtree_alive);
1184 if (sav != NULL) {
1185 SAV_ADDREF(sav);
1186 break;
1187 }
1188 }
1189 SAHTREE_RUNLOCK();
1190 KEYDBG(IPSEC_STAMP,
1191 printf("%s: return SA(%p)\n", __func__, sav));
1192 if (sav != NULL)
1193 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1194 return (sav);
1195 }
1196
1197 /*
1198 * Must be called after calling key_allocsp().
1199 */
1200 void
key_freesp(struct secpolicy ** spp)1201 key_freesp(struct secpolicy **spp)
1202 {
1203 struct secpolicy *sp = *spp;
1204
1205 IPSEC_ASSERT(sp != NULL, ("null sp"));
1206 if (SP_DELREF(sp) == 0)
1207 return;
1208
1209 KEYDBG(IPSEC_STAMP,
1210 printf("%s: last reference to SP(%p)\n", __func__, sp));
1211 KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
1212
1213 *spp = NULL;
1214 while (sp->tcount > 0)
1215 ipsec_delisr(sp->req[--sp->tcount]);
1216 free(sp, M_IPSEC_SP);
1217 }
1218
1219 static void
key_unlink(struct secpolicy * sp)1220 key_unlink(struct secpolicy *sp)
1221 {
1222
1223 IPSEC_ASSERT(sp->spidx.dir == IPSEC_DIR_INBOUND ||
1224 sp->spidx.dir == IPSEC_DIR_OUTBOUND,
1225 ("invalid direction %u", sp->spidx.dir));
1226 SPTREE_UNLOCK_ASSERT();
1227
1228 KEYDBG(KEY_STAMP,
1229 printf("%s: SP(%p)\n", __func__, sp));
1230 SPTREE_WLOCK();
1231 if (sp->state != IPSEC_SPSTATE_ALIVE) {
1232 /* SP is already unlinked */
1233 SPTREE_WUNLOCK();
1234 return;
1235 }
1236 sp->state = IPSEC_SPSTATE_DEAD;
1237 TAILQ_REMOVE(&V_sptree[sp->spidx.dir], sp, chain);
1238 V_spd_size--;
1239 LIST_REMOVE(sp, idhash);
1240 V_sp_genid++;
1241 SPTREE_WUNLOCK();
1242 if (SPDCACHE_ENABLED())
1243 spdcache_clear();
1244 key_freesp(&sp);
1245 }
1246
1247 /*
1248 * insert a secpolicy into the SP database. Lower priorities first
1249 */
1250 static void
key_insertsp(struct secpolicy * newsp)1251 key_insertsp(struct secpolicy *newsp)
1252 {
1253 struct secpolicy *sp;
1254
1255 SPTREE_WLOCK_ASSERT();
1256 TAILQ_FOREACH(sp, &V_sptree[newsp->spidx.dir], chain) {
1257 if (newsp->priority < sp->priority) {
1258 TAILQ_INSERT_BEFORE(sp, newsp, chain);
1259 goto done;
1260 }
1261 }
1262 TAILQ_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, chain);
1263 done:
1264 LIST_INSERT_HEAD(SPHASH_HASH(newsp->id), newsp, idhash);
1265 newsp->state = IPSEC_SPSTATE_ALIVE;
1266 V_spd_size++;
1267 V_sp_genid++;
1268 }
1269
1270 /*
1271 * Insert a bunch of VTI secpolicies into the SPDB.
1272 * We keep VTI policies in the separate list due to following reasons:
1273 * 1) they should be immutable to user's or some deamon's attempts to
1274 * delete. The only way delete such policies - destroy or unconfigure
1275 * corresponding virtual inteface.
1276 * 2) such policies have traffic selector that matches all traffic per
1277 * address family.
1278 * Since all VTI policies have the same priority, we don't care about
1279 * policies order.
1280 */
1281 int
key_register_ifnet(struct secpolicy ** spp,u_int count)1282 key_register_ifnet(struct secpolicy **spp, u_int count)
1283 {
1284 struct mbuf *m;
1285 u_int i;
1286
1287 SPTREE_WLOCK();
1288 /*
1289 * First of try to acquire id for each SP.
1290 */
1291 for (i = 0; i < count; i++) {
1292 IPSEC_ASSERT(spp[i]->spidx.dir == IPSEC_DIR_INBOUND ||
1293 spp[i]->spidx.dir == IPSEC_DIR_OUTBOUND,
1294 ("invalid direction %u", spp[i]->spidx.dir));
1295
1296 if ((spp[i]->id = key_getnewspid()) == 0) {
1297 SPTREE_WUNLOCK();
1298 return (EAGAIN);
1299 }
1300 }
1301 for (i = 0; i < count; i++) {
1302 TAILQ_INSERT_TAIL(&V_sptree_ifnet[spp[i]->spidx.dir],
1303 spp[i], chain);
1304 /*
1305 * NOTE: despite the fact that we keep VTI SP in the
1306 * separate list, SPHASH contains policies from both
1307 * sources. Thus SADB_X_SPDGET will correctly return
1308 * SP by id, because it uses SPHASH for lookups.
1309 */
1310 LIST_INSERT_HEAD(SPHASH_HASH(spp[i]->id), spp[i], idhash);
1311 spp[i]->state = IPSEC_SPSTATE_IFNET;
1312 }
1313 SPTREE_WUNLOCK();
1314 /*
1315 * Notify user processes about new SP.
1316 */
1317 for (i = 0; i < count; i++) {
1318 m = key_setdumpsp(spp[i], SADB_X_SPDADD, 0, 0);
1319 if (m != NULL)
1320 key_sendup_mbuf(NULL, m, KEY_SENDUP_ALL);
1321 }
1322 return (0);
1323 }
1324
1325 void
key_unregister_ifnet(struct secpolicy ** spp,u_int count)1326 key_unregister_ifnet(struct secpolicy **spp, u_int count)
1327 {
1328 struct mbuf *m;
1329 u_int i;
1330
1331 SPTREE_WLOCK();
1332 for (i = 0; i < count; i++) {
1333 IPSEC_ASSERT(spp[i]->spidx.dir == IPSEC_DIR_INBOUND ||
1334 spp[i]->spidx.dir == IPSEC_DIR_OUTBOUND,
1335 ("invalid direction %u", spp[i]->spidx.dir));
1336
1337 if (spp[i]->state != IPSEC_SPSTATE_IFNET)
1338 continue;
1339 spp[i]->state = IPSEC_SPSTATE_DEAD;
1340 TAILQ_REMOVE(&V_sptree_ifnet[spp[i]->spidx.dir],
1341 spp[i], chain);
1342 V_spd_size--;
1343 LIST_REMOVE(spp[i], idhash);
1344 }
1345 SPTREE_WUNLOCK();
1346 if (SPDCACHE_ENABLED())
1347 spdcache_clear();
1348
1349 for (i = 0; i < count; i++) {
1350 m = key_setdumpsp(spp[i], SADB_X_SPDDELETE, 0, 0);
1351 if (m != NULL)
1352 key_sendup_mbuf(NULL, m, KEY_SENDUP_ALL);
1353 }
1354 }
1355
1356 /*
1357 * Must be called after calling key_allocsa().
1358 * This function is called by key_freesp() to free some SA allocated
1359 * for a policy.
1360 */
1361 void
key_freesav(struct secasvar ** psav)1362 key_freesav(struct secasvar **psav)
1363 {
1364 struct secasvar *sav = *psav;
1365
1366 IPSEC_ASSERT(sav != NULL, ("null sav"));
1367 if (SAV_DELREF(sav) == 0)
1368 return;
1369
1370 KEYDBG(IPSEC_STAMP,
1371 printf("%s: last reference to SA(%p)\n", __func__, sav));
1372
1373 *psav = NULL;
1374 key_delsav(sav);
1375 }
1376
1377 /*
1378 * Unlink SA from SAH and SPI hash under SAHTREE_WLOCK.
1379 * Expect that SA has extra reference due to lookup.
1380 * Release this references, also release SAH reference after unlink.
1381 */
1382 static void
key_unlinksav(struct secasvar * sav)1383 key_unlinksav(struct secasvar *sav)
1384 {
1385 struct secashead *sah;
1386
1387 KEYDBG(KEY_STAMP,
1388 printf("%s: SA(%p)\n", __func__, sav));
1389
1390 SAHTREE_UNLOCK_ASSERT();
1391 SAHTREE_WLOCK();
1392 if (sav->state == SADB_SASTATE_DEAD) {
1393 /* SA is already unlinked */
1394 SAHTREE_WUNLOCK();
1395 return;
1396 }
1397 /* Unlink from SAH */
1398 if (sav->state == SADB_SASTATE_LARVAL)
1399 TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
1400 else
1401 TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
1402 /* Unlink from SPI hash */
1403 LIST_REMOVE(sav, spihash);
1404 sav->state = SADB_SASTATE_DEAD;
1405 sah = sav->sah;
1406 SAHTREE_WUNLOCK();
1407 key_freesav(&sav);
1408 /* Since we are unlinked, release reference to SAH */
1409 key_freesah(&sah);
1410 }
1411
1412 /* %%% SPD management */
1413 /*
1414 * search SPD
1415 * OUT: NULL : not found
1416 * others : found, pointer to a SP.
1417 */
1418 static struct secpolicy *
key_getsp(struct secpolicyindex * spidx)1419 key_getsp(struct secpolicyindex *spidx)
1420 {
1421 SPTREE_RLOCK_TRACKER;
1422 struct secpolicy *sp;
1423
1424 IPSEC_ASSERT(spidx != NULL, ("null spidx"));
1425
1426 SPTREE_RLOCK();
1427 TAILQ_FOREACH(sp, &V_sptree[spidx->dir], chain) {
1428 if (key_cmpspidx_exactly(spidx, &sp->spidx)) {
1429 SP_ADDREF(sp);
1430 break;
1431 }
1432 }
1433 SPTREE_RUNLOCK();
1434
1435 return sp;
1436 }
1437
1438 /*
1439 * get SP by index.
1440 * OUT: NULL : not found
1441 * others : found, pointer to referenced SP.
1442 */
1443 static struct secpolicy *
key_getspbyid(uint32_t id)1444 key_getspbyid(uint32_t id)
1445 {
1446 SPTREE_RLOCK_TRACKER;
1447 struct secpolicy *sp;
1448
1449 SPTREE_RLOCK();
1450 LIST_FOREACH(sp, SPHASH_HASH(id), idhash) {
1451 if (sp->id == id) {
1452 SP_ADDREF(sp);
1453 break;
1454 }
1455 }
1456 SPTREE_RUNLOCK();
1457 return (sp);
1458 }
1459
1460 struct secpolicy *
key_newsp(void)1461 key_newsp(void)
1462 {
1463 struct secpolicy *sp;
1464
1465 sp = malloc(sizeof(*sp), M_IPSEC_SP, M_NOWAIT | M_ZERO);
1466 if (sp != NULL)
1467 SP_INITREF(sp);
1468 return (sp);
1469 }
1470
1471 struct ipsecrequest *
ipsec_newisr(void)1472 ipsec_newisr(void)
1473 {
1474
1475 return (malloc(sizeof(struct ipsecrequest), M_IPSEC_SR,
1476 M_NOWAIT | M_ZERO));
1477 }
1478
1479 void
ipsec_delisr(struct ipsecrequest * p)1480 ipsec_delisr(struct ipsecrequest *p)
1481 {
1482
1483 free(p, M_IPSEC_SR);
1484 }
1485
1486 /*
1487 * create secpolicy structure from sadb_x_policy structure.
1488 * NOTE: `state', `secpolicyindex' and 'id' in secpolicy structure
1489 * are not set, so must be set properly later.
1490 */
1491 struct secpolicy *
key_msg2sp(struct sadb_x_policy * xpl0,size_t len,int * error)1492 key_msg2sp(struct sadb_x_policy *xpl0, size_t len, int *error)
1493 {
1494 struct secpolicy *newsp;
1495
1496 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0"));
1497 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len));
1498
1499 if (len != PFKEY_EXTLEN(xpl0)) {
1500 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__));
1501 *error = EINVAL;
1502 return NULL;
1503 }
1504
1505 if ((newsp = key_newsp()) == NULL) {
1506 *error = ENOBUFS;
1507 return NULL;
1508 }
1509
1510 newsp->spidx.dir = xpl0->sadb_x_policy_dir;
1511 newsp->policy = xpl0->sadb_x_policy_type;
1512 newsp->priority = xpl0->sadb_x_policy_priority;
1513 newsp->tcount = 0;
1514
1515 /* check policy */
1516 switch (xpl0->sadb_x_policy_type) {
1517 case IPSEC_POLICY_DISCARD:
1518 case IPSEC_POLICY_NONE:
1519 case IPSEC_POLICY_ENTRUST:
1520 case IPSEC_POLICY_BYPASS:
1521 break;
1522
1523 case IPSEC_POLICY_IPSEC:
1524 {
1525 struct sadb_x_ipsecrequest *xisr;
1526 struct ipsecrequest *isr;
1527 int tlen;
1528
1529 /* validity check */
1530 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) {
1531 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n",
1532 __func__));
1533 key_freesp(&newsp);
1534 *error = EINVAL;
1535 return NULL;
1536 }
1537
1538 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0);
1539 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1);
1540
1541 while (tlen > 0) {
1542 /* length check */
1543 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr) ||
1544 xisr->sadb_x_ipsecrequest_len > tlen) {
1545 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest "
1546 "length.\n", __func__));
1547 key_freesp(&newsp);
1548 *error = EINVAL;
1549 return NULL;
1550 }
1551
1552 if (newsp->tcount >= IPSEC_MAXREQ) {
1553 ipseclog((LOG_DEBUG,
1554 "%s: too many ipsecrequests.\n",
1555 __func__));
1556 key_freesp(&newsp);
1557 *error = EINVAL;
1558 return (NULL);
1559 }
1560
1561 /* allocate request buffer */
1562 /* NB: data structure is zero'd */
1563 isr = ipsec_newisr();
1564 if (isr == NULL) {
1565 ipseclog((LOG_DEBUG,
1566 "%s: No more memory.\n", __func__));
1567 key_freesp(&newsp);
1568 *error = ENOBUFS;
1569 return NULL;
1570 }
1571
1572 newsp->req[newsp->tcount++] = isr;
1573
1574 /* set values */
1575 switch (xisr->sadb_x_ipsecrequest_proto) {
1576 case IPPROTO_ESP:
1577 case IPPROTO_AH:
1578 case IPPROTO_IPCOMP:
1579 break;
1580 default:
1581 ipseclog((LOG_DEBUG,
1582 "%s: invalid proto type=%u\n", __func__,
1583 xisr->sadb_x_ipsecrequest_proto));
1584 key_freesp(&newsp);
1585 *error = EPROTONOSUPPORT;
1586 return NULL;
1587 }
1588 isr->saidx.proto =
1589 (uint8_t)xisr->sadb_x_ipsecrequest_proto;
1590
1591 switch (xisr->sadb_x_ipsecrequest_mode) {
1592 case IPSEC_MODE_TRANSPORT:
1593 case IPSEC_MODE_TUNNEL:
1594 break;
1595 case IPSEC_MODE_ANY:
1596 default:
1597 ipseclog((LOG_DEBUG,
1598 "%s: invalid mode=%u\n", __func__,
1599 xisr->sadb_x_ipsecrequest_mode));
1600 key_freesp(&newsp);
1601 *error = EINVAL;
1602 return NULL;
1603 }
1604 isr->saidx.mode = xisr->sadb_x_ipsecrequest_mode;
1605
1606 switch (xisr->sadb_x_ipsecrequest_level) {
1607 case IPSEC_LEVEL_DEFAULT:
1608 case IPSEC_LEVEL_USE:
1609 case IPSEC_LEVEL_REQUIRE:
1610 break;
1611 case IPSEC_LEVEL_UNIQUE:
1612 /* validity check */
1613 /*
1614 * If range violation of reqid, kernel will
1615 * update it, don't refuse it.
1616 */
1617 if (xisr->sadb_x_ipsecrequest_reqid
1618 > IPSEC_MANUAL_REQID_MAX) {
1619 ipseclog((LOG_DEBUG,
1620 "%s: reqid=%d range "
1621 "violation, updated by kernel.\n",
1622 __func__,
1623 xisr->sadb_x_ipsecrequest_reqid));
1624 xisr->sadb_x_ipsecrequest_reqid = 0;
1625 }
1626
1627 /* allocate new reqid id if reqid is zero. */
1628 if (xisr->sadb_x_ipsecrequest_reqid == 0) {
1629 u_int32_t reqid;
1630 if ((reqid = key_newreqid()) == 0) {
1631 key_freesp(&newsp);
1632 *error = ENOBUFS;
1633 return NULL;
1634 }
1635 isr->saidx.reqid = reqid;
1636 xisr->sadb_x_ipsecrequest_reqid = reqid;
1637 } else {
1638 /* set it for manual keying. */
1639 isr->saidx.reqid =
1640 xisr->sadb_x_ipsecrequest_reqid;
1641 }
1642 break;
1643
1644 default:
1645 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n",
1646 __func__,
1647 xisr->sadb_x_ipsecrequest_level));
1648 key_freesp(&newsp);
1649 *error = EINVAL;
1650 return NULL;
1651 }
1652 isr->level = xisr->sadb_x_ipsecrequest_level;
1653
1654 /* set IP addresses if there */
1655 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
1656 struct sockaddr *paddr;
1657
1658 len = tlen - sizeof(*xisr);
1659 paddr = (struct sockaddr *)(xisr + 1);
1660 /* validity check */
1661 if (len < sizeof(struct sockaddr) ||
1662 len < 2 * paddr->sa_len ||
1663 paddr->sa_len > sizeof(isr->saidx.src)) {
1664 ipseclog((LOG_DEBUG, "%s: invalid "
1665 "request address length.\n",
1666 __func__));
1667 key_freesp(&newsp);
1668 *error = EINVAL;
1669 return NULL;
1670 }
1671 /*
1672 * Request length should be enough to keep
1673 * source and destination addresses.
1674 */
1675 if (xisr->sadb_x_ipsecrequest_len <
1676 sizeof(*xisr) + 2 * paddr->sa_len) {
1677 ipseclog((LOG_DEBUG, "%s: invalid "
1678 "ipsecrequest length.\n",
1679 __func__));
1680 key_freesp(&newsp);
1681 *error = EINVAL;
1682 return (NULL);
1683 }
1684 bcopy(paddr, &isr->saidx.src, paddr->sa_len);
1685 paddr = (struct sockaddr *)((caddr_t)paddr +
1686 paddr->sa_len);
1687
1688 /* validity check */
1689 if (paddr->sa_len !=
1690 isr->saidx.src.sa.sa_len) {
1691 ipseclog((LOG_DEBUG, "%s: invalid "
1692 "request address length.\n",
1693 __func__));
1694 key_freesp(&newsp);
1695 *error = EINVAL;
1696 return NULL;
1697 }
1698 /* AF family should match */
1699 if (paddr->sa_family !=
1700 isr->saidx.src.sa.sa_family) {
1701 ipseclog((LOG_DEBUG, "%s: address "
1702 "family doesn't match.\n",
1703 __func__));
1704 key_freesp(&newsp);
1705 *error = EINVAL;
1706 return (NULL);
1707 }
1708 bcopy(paddr, &isr->saidx.dst, paddr->sa_len);
1709 } else {
1710 /*
1711 * Addresses for TUNNEL mode requests are
1712 * mandatory.
1713 */
1714 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1715 ipseclog((LOG_DEBUG, "%s: missing "
1716 "request addresses.\n", __func__));
1717 key_freesp(&newsp);
1718 *error = EINVAL;
1719 return (NULL);
1720 }
1721 }
1722 tlen -= xisr->sadb_x_ipsecrequest_len;
1723
1724 /* validity check */
1725 if (tlen < 0) {
1726 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n",
1727 __func__));
1728 key_freesp(&newsp);
1729 *error = EINVAL;
1730 return NULL;
1731 }
1732
1733 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr
1734 + xisr->sadb_x_ipsecrequest_len);
1735 }
1736 /* XXXAE: LARVAL SP */
1737 if (newsp->tcount < 1) {
1738 ipseclog((LOG_DEBUG, "%s: valid IPSEC transforms "
1739 "not found.\n", __func__));
1740 key_freesp(&newsp);
1741 *error = EINVAL;
1742 return (NULL);
1743 }
1744 }
1745 break;
1746 default:
1747 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
1748 key_freesp(&newsp);
1749 *error = EINVAL;
1750 return NULL;
1751 }
1752
1753 *error = 0;
1754 return (newsp);
1755 }
1756
1757 uint32_t
key_newreqid(void)1758 key_newreqid(void)
1759 {
1760 static uint32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
1761
1762 if (auto_reqid == ~0)
1763 auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
1764 else
1765 auto_reqid++;
1766
1767 /* XXX should be unique check */
1768 return (auto_reqid);
1769 }
1770
1771 /*
1772 * copy secpolicy struct to sadb_x_policy structure indicated.
1773 */
1774 static struct mbuf *
key_sp2mbuf(struct secpolicy * sp)1775 key_sp2mbuf(struct secpolicy *sp)
1776 {
1777 struct mbuf *m;
1778 size_t tlen;
1779
1780 tlen = key_getspreqmsglen(sp);
1781 m = m_get2(tlen, M_NOWAIT, MT_DATA, 0);
1782 if (m == NULL)
1783 return (NULL);
1784 m_align(m, tlen);
1785 m->m_len = tlen;
1786 if (key_sp2msg(sp, m->m_data, &tlen) != 0) {
1787 m_freem(m);
1788 return (NULL);
1789 }
1790 return (m);
1791 }
1792
1793 int
key_sp2msg(struct secpolicy * sp,void * request,size_t * len)1794 key_sp2msg(struct secpolicy *sp, void *request, size_t *len)
1795 {
1796 struct sadb_x_ipsecrequest *xisr;
1797 struct sadb_x_policy *xpl;
1798 struct ipsecrequest *isr;
1799 size_t xlen, ilen;
1800 caddr_t p;
1801 int error, i;
1802
1803 IPSEC_ASSERT(sp != NULL, ("null policy"));
1804
1805 xlen = sizeof(*xpl);
1806 if (*len < xlen)
1807 return (EINVAL);
1808
1809 error = 0;
1810 bzero(request, *len);
1811 xpl = (struct sadb_x_policy *)request;
1812 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1813 xpl->sadb_x_policy_type = sp->policy;
1814 xpl->sadb_x_policy_dir = sp->spidx.dir;
1815 xpl->sadb_x_policy_id = sp->id;
1816 xpl->sadb_x_policy_priority = sp->priority;
1817 switch (sp->state) {
1818 case IPSEC_SPSTATE_IFNET:
1819 xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_IFNET;
1820 break;
1821 case IPSEC_SPSTATE_PCB:
1822 xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_PCB;
1823 break;
1824 default:
1825 xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_GLOBAL;
1826 }
1827
1828 /* if is the policy for ipsec ? */
1829 if (sp->policy == IPSEC_POLICY_IPSEC) {
1830 p = (caddr_t)xpl + sizeof(*xpl);
1831 for (i = 0; i < sp->tcount; i++) {
1832 isr = sp->req[i];
1833 ilen = PFKEY_ALIGN8(sizeof(*xisr) +
1834 isr->saidx.src.sa.sa_len +
1835 isr->saidx.dst.sa.sa_len);
1836 xlen += ilen;
1837 if (xlen > *len) {
1838 error = ENOBUFS;
1839 /* Calculate needed size */
1840 continue;
1841 }
1842 xisr = (struct sadb_x_ipsecrequest *)p;
1843 xisr->sadb_x_ipsecrequest_len = ilen;
1844 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto;
1845 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode;
1846 xisr->sadb_x_ipsecrequest_level = isr->level;
1847 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid;
1848
1849 p += sizeof(*xisr);
1850 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len);
1851 p += isr->saidx.src.sa.sa_len;
1852 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len);
1853 p += isr->saidx.dst.sa.sa_len;
1854 }
1855 }
1856 xpl->sadb_x_policy_len = PFKEY_UNIT64(xlen);
1857 if (error == 0)
1858 *len = xlen;
1859 else
1860 *len = sizeof(*xpl);
1861 return (error);
1862 }
1863
1864 /* m will not be freed nor modified */
1865 static struct mbuf *
key_gather_mbuf(struct mbuf * m,const struct sadb_msghdr * mhp,int ndeep,int nitem,...)1866 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp,
1867 int ndeep, int nitem, ...)
1868 {
1869 va_list ap;
1870 int idx;
1871 int i;
1872 struct mbuf *result = NULL, *n;
1873 int len;
1874
1875 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1876 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
1877
1878 va_start(ap, nitem);
1879 for (i = 0; i < nitem; i++) {
1880 idx = va_arg(ap, int);
1881 if (idx < 0 || idx > SADB_EXT_MAX)
1882 goto fail;
1883 /* don't attempt to pull empty extension */
1884 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL)
1885 continue;
1886 if (idx != SADB_EXT_RESERVED &&
1887 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0))
1888 continue;
1889
1890 if (idx == SADB_EXT_RESERVED) {
1891 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
1892
1893 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len));
1894
1895 MGETHDR(n, M_NOWAIT, MT_DATA);
1896 if (!n)
1897 goto fail;
1898 n->m_len = len;
1899 n->m_next = NULL;
1900 m_copydata(m, 0, sizeof(struct sadb_msg),
1901 mtod(n, caddr_t));
1902 } else if (i < ndeep) {
1903 len = mhp->extlen[idx];
1904 n = m_get2(len, M_NOWAIT, MT_DATA, 0);
1905 if (n == NULL)
1906 goto fail;
1907 m_align(n, len);
1908 n->m_len = len;
1909 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx],
1910 mtod(n, caddr_t));
1911 } else {
1912 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx],
1913 M_NOWAIT);
1914 }
1915 if (n == NULL)
1916 goto fail;
1917
1918 if (result)
1919 m_cat(result, n);
1920 else
1921 result = n;
1922 }
1923 va_end(ap);
1924
1925 if ((result->m_flags & M_PKTHDR) != 0) {
1926 result->m_pkthdr.len = 0;
1927 for (n = result; n; n = n->m_next)
1928 result->m_pkthdr.len += n->m_len;
1929 }
1930
1931 return result;
1932
1933 fail:
1934 m_freem(result);
1935 va_end(ap);
1936 return NULL;
1937 }
1938
1939 /*
1940 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing
1941 * add an entry to SP database, when received
1942 * <base, address(SD), (lifetime(H),) policy>
1943 * from the user(?).
1944 * Adding to SP database,
1945 * and send
1946 * <base, address(SD), (lifetime(H),) policy>
1947 * to the socket which was send.
1948 *
1949 * SPDADD set a unique policy entry.
1950 * SPDSETIDX like SPDADD without a part of policy requests.
1951 * SPDUPDATE replace a unique policy entry.
1952 *
1953 * XXXAE: serialize this in PF_KEY to avoid races.
1954 * m will always be freed.
1955 */
1956 static int
key_spdadd(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)1957 key_spdadd(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
1958 {
1959 struct secpolicyindex spidx;
1960 struct sadb_address *src0, *dst0;
1961 struct sadb_x_policy *xpl0, *xpl;
1962 struct sadb_lifetime *lft = NULL;
1963 struct secpolicy *newsp;
1964 int error;
1965
1966 IPSEC_ASSERT(so != NULL, ("null socket"));
1967 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1968 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
1969 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
1970
1971 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
1972 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
1973 SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY)) {
1974 ipseclog((LOG_DEBUG,
1975 "%s: invalid message: missing required header.\n",
1976 __func__));
1977 return key_senderror(so, m, EINVAL);
1978 }
1979 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
1980 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
1981 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
1982 ipseclog((LOG_DEBUG,
1983 "%s: invalid message: wrong header size.\n", __func__));
1984 return key_senderror(so, m, EINVAL);
1985 }
1986 if (!SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD)) {
1987 if (SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_HARD)) {
1988 ipseclog((LOG_DEBUG,
1989 "%s: invalid message: wrong header size.\n",
1990 __func__));
1991 return key_senderror(so, m, EINVAL);
1992 }
1993 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
1994 }
1995
1996 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
1997 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
1998 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
1999
2000 /* check the direciton */
2001 switch (xpl0->sadb_x_policy_dir) {
2002 case IPSEC_DIR_INBOUND:
2003 case IPSEC_DIR_OUTBOUND:
2004 break;
2005 default:
2006 ipseclog((LOG_DEBUG, "%s: invalid SP direction.\n", __func__));
2007 return key_senderror(so, m, EINVAL);
2008 }
2009 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */
2010 if (xpl0->sadb_x_policy_type != IPSEC_POLICY_DISCARD &&
2011 xpl0->sadb_x_policy_type != IPSEC_POLICY_NONE &&
2012 xpl0->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
2013 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
2014 return key_senderror(so, m, EINVAL);
2015 }
2016
2017 /* policy requests are mandatory when action is ipsec. */
2018 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2019 mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) {
2020 ipseclog((LOG_DEBUG,
2021 "%s: policy requests required.\n", __func__));
2022 return key_senderror(so, m, EINVAL);
2023 }
2024
2025 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
2026 (struct sockaddr *)(dst0 + 1));
2027 if (error != 0 ||
2028 src0->sadb_address_proto != dst0->sadb_address_proto) {
2029 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
2030 return key_senderror(so, m, error);
2031 }
2032 /* make secindex */
2033 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
2034 src0 + 1,
2035 dst0 + 1,
2036 src0->sadb_address_prefixlen,
2037 dst0->sadb_address_prefixlen,
2038 src0->sadb_address_proto,
2039 &spidx);
2040 /* Checking there is SP already or not. */
2041 newsp = key_getsp(&spidx);
2042 if (newsp != NULL) {
2043 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
2044 KEYDBG(KEY_STAMP,
2045 printf("%s: unlink SP(%p) for SPDUPDATE\n",
2046 __func__, newsp));
2047 KEYDBG(KEY_DATA, kdebug_secpolicy(newsp));
2048 key_unlink(newsp);
2049 key_freesp(&newsp);
2050 } else {
2051 key_freesp(&newsp);
2052 ipseclog((LOG_DEBUG,
2053 "%s: a SP entry exists already.\n", __func__));
2054 return (key_senderror(so, m, EEXIST));
2055 }
2056 }
2057
2058 /* allocate new SP entry */
2059 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) {
2060 return key_senderror(so, m, error);
2061 }
2062
2063 newsp->lastused = newsp->created = time_second;
2064 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0;
2065 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0;
2066 bcopy(&spidx, &newsp->spidx, sizeof(spidx));
2067
2068 /* XXXAE: there is race between key_getsp() and key_insertsp() */
2069 SPTREE_WLOCK();
2070 if ((newsp->id = key_getnewspid()) == 0) {
2071 SPTREE_WUNLOCK();
2072 key_freesp(&newsp);
2073 return key_senderror(so, m, ENOBUFS);
2074 }
2075 key_insertsp(newsp);
2076 SPTREE_WUNLOCK();
2077 if (SPDCACHE_ENABLED())
2078 spdcache_clear();
2079
2080 KEYDBG(KEY_STAMP,
2081 printf("%s: SP(%p)\n", __func__, newsp));
2082 KEYDBG(KEY_DATA, kdebug_secpolicy(newsp));
2083
2084 {
2085 struct mbuf *n, *mpolicy;
2086 struct sadb_msg *newmsg;
2087 int off;
2088
2089 /* create new sadb_msg to reply. */
2090 if (lft) {
2091 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED,
2092 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD,
2093 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
2094 } else {
2095 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED,
2096 SADB_X_EXT_POLICY,
2097 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
2098 }
2099 if (!n)
2100 return key_senderror(so, m, ENOBUFS);
2101
2102 if (n->m_len < sizeof(*newmsg)) {
2103 n = m_pullup(n, sizeof(*newmsg));
2104 if (!n)
2105 return key_senderror(so, m, ENOBUFS);
2106 }
2107 newmsg = mtod(n, struct sadb_msg *);
2108 newmsg->sadb_msg_errno = 0;
2109 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2110
2111 off = 0;
2112 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)),
2113 sizeof(*xpl), &off);
2114 if (mpolicy == NULL) {
2115 /* n is already freed */
2116 return key_senderror(so, m, ENOBUFS);
2117 }
2118 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off);
2119 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
2120 m_freem(n);
2121 return key_senderror(so, m, EINVAL);
2122 }
2123 xpl->sadb_x_policy_id = newsp->id;
2124
2125 m_freem(m);
2126 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2127 }
2128 }
2129
2130 /*
2131 * get new policy id.
2132 * OUT:
2133 * 0: failure.
2134 * others: success.
2135 */
2136 static uint32_t
key_getnewspid(void)2137 key_getnewspid(void)
2138 {
2139 struct secpolicy *sp;
2140 uint32_t newid = 0;
2141 int count = V_key_spi_trycnt; /* XXX */
2142
2143 SPTREE_WLOCK_ASSERT();
2144 while (count--) {
2145 if (V_policy_id == ~0) /* overflowed */
2146 newid = V_policy_id = 1;
2147 else
2148 newid = ++V_policy_id;
2149 LIST_FOREACH(sp, SPHASH_HASH(newid), idhash) {
2150 if (sp->id == newid)
2151 break;
2152 }
2153 if (sp == NULL)
2154 break;
2155 }
2156 if (count == 0 || newid == 0) {
2157 ipseclog((LOG_DEBUG, "%s: failed to allocate policy id.\n",
2158 __func__));
2159 return (0);
2160 }
2161 return (newid);
2162 }
2163
2164 /*
2165 * SADB_SPDDELETE processing
2166 * receive
2167 * <base, address(SD), policy(*)>
2168 * from the user(?), and set SADB_SASTATE_DEAD,
2169 * and send,
2170 * <base, address(SD), policy(*)>
2171 * to the ikmpd.
2172 * policy(*) including direction of policy.
2173 *
2174 * m will always be freed.
2175 */
2176 static int
key_spddelete(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2177 key_spddelete(struct socket *so, struct mbuf *m,
2178 const struct sadb_msghdr *mhp)
2179 {
2180 struct secpolicyindex spidx;
2181 struct sadb_address *src0, *dst0;
2182 struct sadb_x_policy *xpl0;
2183 struct secpolicy *sp;
2184
2185 IPSEC_ASSERT(so != NULL, ("null so"));
2186 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2187 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2188 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2189
2190 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
2191 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
2192 SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY)) {
2193 ipseclog((LOG_DEBUG,
2194 "%s: invalid message: missing required header.\n",
2195 __func__));
2196 return key_senderror(so, m, EINVAL);
2197 }
2198 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
2199 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
2200 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
2201 ipseclog((LOG_DEBUG,
2202 "%s: invalid message: wrong header size.\n", __func__));
2203 return key_senderror(so, m, EINVAL);
2204 }
2205
2206 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
2207 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
2208 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
2209
2210 /* check the direciton */
2211 switch (xpl0->sadb_x_policy_dir) {
2212 case IPSEC_DIR_INBOUND:
2213 case IPSEC_DIR_OUTBOUND:
2214 break;
2215 default:
2216 ipseclog((LOG_DEBUG, "%s: invalid SP direction.\n", __func__));
2217 return key_senderror(so, m, EINVAL);
2218 }
2219 /* Only DISCARD, NONE and IPSEC are allowed */
2220 if (xpl0->sadb_x_policy_type != IPSEC_POLICY_DISCARD &&
2221 xpl0->sadb_x_policy_type != IPSEC_POLICY_NONE &&
2222 xpl0->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
2223 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
2224 return key_senderror(so, m, EINVAL);
2225 }
2226 if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
2227 (struct sockaddr *)(dst0 + 1)) != 0 ||
2228 src0->sadb_address_proto != dst0->sadb_address_proto) {
2229 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
2230 return key_senderror(so, m, EINVAL);
2231 }
2232 /* make secindex */
2233 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
2234 src0 + 1,
2235 dst0 + 1,
2236 src0->sadb_address_prefixlen,
2237 dst0->sadb_address_prefixlen,
2238 src0->sadb_address_proto,
2239 &spidx);
2240
2241 /* Is there SP in SPD ? */
2242 if ((sp = key_getsp(&spidx)) == NULL) {
2243 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__));
2244 return key_senderror(so, m, EINVAL);
2245 }
2246
2247 /* save policy id to buffer to be returned. */
2248 xpl0->sadb_x_policy_id = sp->id;
2249
2250 KEYDBG(KEY_STAMP,
2251 printf("%s: SP(%p)\n", __func__, sp));
2252 KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
2253 key_unlink(sp);
2254 key_freesp(&sp);
2255
2256 {
2257 struct mbuf *n;
2258 struct sadb_msg *newmsg;
2259
2260 /* create new sadb_msg to reply. */
2261 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
2262 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
2263 if (!n)
2264 return key_senderror(so, m, ENOBUFS);
2265
2266 newmsg = mtod(n, struct sadb_msg *);
2267 newmsg->sadb_msg_errno = 0;
2268 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2269
2270 m_freem(m);
2271 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2272 }
2273 }
2274
2275 /*
2276 * SADB_SPDDELETE2 processing
2277 * receive
2278 * <base, policy(*)>
2279 * from the user(?), and set SADB_SASTATE_DEAD,
2280 * and send,
2281 * <base, policy(*)>
2282 * to the ikmpd.
2283 * policy(*) including direction of policy.
2284 *
2285 * m will always be freed.
2286 */
2287 static int
key_spddelete2(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2288 key_spddelete2(struct socket *so, struct mbuf *m,
2289 const struct sadb_msghdr *mhp)
2290 {
2291 struct secpolicy *sp;
2292 uint32_t id;
2293
2294 IPSEC_ASSERT(so != NULL, ("null socket"));
2295 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2296 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2297 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2298
2299 if (SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY) ||
2300 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
2301 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
2302 __func__));
2303 return key_senderror(so, m, EINVAL);
2304 }
2305
2306 id = ((struct sadb_x_policy *)
2307 mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2308
2309 /* Is there SP in SPD ? */
2310 if ((sp = key_getspbyid(id)) == NULL) {
2311 ipseclog((LOG_DEBUG, "%s: no SP found for id %u.\n",
2312 __func__, id));
2313 return key_senderror(so, m, EINVAL);
2314 }
2315
2316 KEYDBG(KEY_STAMP,
2317 printf("%s: SP(%p)\n", __func__, sp));
2318 KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
2319 key_unlink(sp);
2320 if (sp->state != IPSEC_SPSTATE_DEAD) {
2321 ipseclog((LOG_DEBUG, "%s: failed to delete SP with id %u.\n",
2322 __func__, id));
2323 key_freesp(&sp);
2324 return (key_senderror(so, m, EACCES));
2325 }
2326 key_freesp(&sp);
2327
2328 {
2329 struct mbuf *n, *nn;
2330 struct sadb_msg *newmsg;
2331 int off, len;
2332
2333 /* create new sadb_msg to reply. */
2334 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2335
2336 n = key_mget(len);
2337 if (n == NULL)
2338 return key_senderror(so, m, ENOBUFS);
2339
2340 n->m_len = len;
2341 n->m_next = NULL;
2342 off = 0;
2343
2344 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
2345 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
2346
2347 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)",
2348 off, len));
2349
2350 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY],
2351 mhp->extlen[SADB_X_EXT_POLICY], M_NOWAIT);
2352 if (!n->m_next) {
2353 m_freem(n);
2354 return key_senderror(so, m, ENOBUFS);
2355 }
2356
2357 n->m_pkthdr.len = 0;
2358 for (nn = n; nn; nn = nn->m_next)
2359 n->m_pkthdr.len += nn->m_len;
2360
2361 newmsg = mtod(n, struct sadb_msg *);
2362 newmsg->sadb_msg_errno = 0;
2363 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2364
2365 m_freem(m);
2366 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2367 }
2368 }
2369
2370 /*
2371 * SADB_X_SPDGET processing
2372 * receive
2373 * <base, policy(*)>
2374 * from the user(?),
2375 * and send,
2376 * <base, address(SD), policy>
2377 * to the ikmpd.
2378 * policy(*) including direction of policy.
2379 *
2380 * m will always be freed.
2381 */
2382 static int
key_spdget(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2383 key_spdget(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2384 {
2385 struct secpolicy *sp;
2386 struct mbuf *n;
2387 uint32_t id;
2388
2389 IPSEC_ASSERT(so != NULL, ("null socket"));
2390 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2391 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2392 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2393
2394 if (SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY) ||
2395 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
2396 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
2397 __func__));
2398 return key_senderror(so, m, EINVAL);
2399 }
2400
2401 id = ((struct sadb_x_policy *)
2402 mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2403
2404 /* Is there SP in SPD ? */
2405 if ((sp = key_getspbyid(id)) == NULL) {
2406 ipseclog((LOG_DEBUG, "%s: no SP found for id %u.\n",
2407 __func__, id));
2408 return key_senderror(so, m, ENOENT);
2409 }
2410
2411 n = key_setdumpsp(sp, SADB_X_SPDGET, mhp->msg->sadb_msg_seq,
2412 mhp->msg->sadb_msg_pid);
2413 key_freesp(&sp);
2414 if (n != NULL) {
2415 m_freem(m);
2416 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2417 } else
2418 return key_senderror(so, m, ENOBUFS);
2419 }
2420
2421 /*
2422 * SADB_X_SPDACQUIRE processing.
2423 * Acquire policy and SA(s) for a *OUTBOUND* packet.
2424 * send
2425 * <base, policy(*)>
2426 * to KMD, and expect to receive
2427 * <base> with SADB_X_SPDACQUIRE if error occurred,
2428 * or
2429 * <base, policy>
2430 * with SADB_X_SPDUPDATE from KMD by PF_KEY.
2431 * policy(*) is without policy requests.
2432 *
2433 * 0 : succeed
2434 * others: error number
2435 */
2436 int
key_spdacquire(struct secpolicy * sp)2437 key_spdacquire(struct secpolicy *sp)
2438 {
2439 struct mbuf *result = NULL, *m;
2440 struct secspacq *newspacq;
2441
2442 IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
2443 IPSEC_ASSERT(sp->req == NULL, ("policy exists"));
2444 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
2445 ("policy not IPSEC %u", sp->policy));
2446
2447 /* Get an entry to check whether sent message or not. */
2448 newspacq = key_getspacq(&sp->spidx);
2449 if (newspacq != NULL) {
2450 if (V_key_blockacq_count < newspacq->count) {
2451 /* reset counter and do send message. */
2452 newspacq->count = 0;
2453 } else {
2454 /* increment counter and do nothing. */
2455 newspacq->count++;
2456 SPACQ_UNLOCK();
2457 return (0);
2458 }
2459 SPACQ_UNLOCK();
2460 } else {
2461 /* make new entry for blocking to send SADB_ACQUIRE. */
2462 newspacq = key_newspacq(&sp->spidx);
2463 if (newspacq == NULL)
2464 return ENOBUFS;
2465 }
2466
2467 /* create new sadb_msg to reply. */
2468 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0);
2469 if (!m)
2470 return ENOBUFS;
2471
2472 result = m;
2473
2474 result->m_pkthdr.len = 0;
2475 for (m = result; m; m = m->m_next)
2476 result->m_pkthdr.len += m->m_len;
2477
2478 mtod(result, struct sadb_msg *)->sadb_msg_len =
2479 PFKEY_UNIT64(result->m_pkthdr.len);
2480
2481 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED);
2482 }
2483
2484 /*
2485 * SADB_SPDFLUSH processing
2486 * receive
2487 * <base>
2488 * from the user, and free all entries in secpctree.
2489 * and send,
2490 * <base>
2491 * to the user.
2492 * NOTE: what to do is only marking SADB_SASTATE_DEAD.
2493 *
2494 * m will always be freed.
2495 */
2496 static int
key_spdflush(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2497 key_spdflush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2498 {
2499 struct secpolicy_queue drainq;
2500 struct sadb_msg *newmsg;
2501 struct secpolicy *sp, *nextsp;
2502 u_int dir;
2503
2504 IPSEC_ASSERT(so != NULL, ("null socket"));
2505 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2506 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2507 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2508
2509 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg)))
2510 return key_senderror(so, m, EINVAL);
2511
2512 TAILQ_INIT(&drainq);
2513 SPTREE_WLOCK();
2514 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2515 TAILQ_CONCAT(&drainq, &V_sptree[dir], chain);
2516 }
2517 /*
2518 * We need to set state to DEAD for each policy to be sure,
2519 * that another thread won't try to unlink it.
2520 * Also remove SP from sphash.
2521 */
2522 TAILQ_FOREACH(sp, &drainq, chain) {
2523 sp->state = IPSEC_SPSTATE_DEAD;
2524 LIST_REMOVE(sp, idhash);
2525 }
2526 V_sp_genid++;
2527 V_spd_size = 0;
2528 SPTREE_WUNLOCK();
2529 if (SPDCACHE_ENABLED())
2530 spdcache_clear();
2531 sp = TAILQ_FIRST(&drainq);
2532 while (sp != NULL) {
2533 nextsp = TAILQ_NEXT(sp, chain);
2534 key_freesp(&sp);
2535 sp = nextsp;
2536 }
2537
2538 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
2539 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
2540 return key_senderror(so, m, ENOBUFS);
2541 }
2542
2543 if (m->m_next)
2544 m_freem(m->m_next);
2545 m->m_next = NULL;
2546 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2547 newmsg = mtod(m, struct sadb_msg *);
2548 newmsg->sadb_msg_errno = 0;
2549 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
2550
2551 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
2552 }
2553
2554 static uint8_t
key_satype2scopemask(uint8_t satype)2555 key_satype2scopemask(uint8_t satype)
2556 {
2557
2558 if (satype == IPSEC_POLICYSCOPE_ANY)
2559 return (0xff);
2560 return (satype);
2561 }
2562 /*
2563 * SADB_SPDDUMP processing
2564 * receive
2565 * <base>
2566 * from the user, and dump all SP leaves and send,
2567 * <base> .....
2568 * to the ikmpd.
2569 *
2570 * NOTE:
2571 * sadb_msg_satype is considered as mask of policy scopes.
2572 * m will always be freed.
2573 */
2574 static int
key_spddump(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2575 key_spddump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2576 {
2577 SPTREE_RLOCK_TRACKER;
2578 struct secpolicy *sp;
2579 struct mbuf *n;
2580 int cnt;
2581 u_int dir, scope;
2582
2583 IPSEC_ASSERT(so != NULL, ("null socket"));
2584 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2585 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2586 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2587
2588 /* search SPD entry and get buffer size. */
2589 cnt = 0;
2590 scope = key_satype2scopemask(mhp->msg->sadb_msg_satype);
2591 SPTREE_RLOCK();
2592 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2593 if (scope & IPSEC_POLICYSCOPE_GLOBAL) {
2594 TAILQ_FOREACH(sp, &V_sptree[dir], chain)
2595 cnt++;
2596 }
2597 if (scope & IPSEC_POLICYSCOPE_IFNET) {
2598 TAILQ_FOREACH(sp, &V_sptree_ifnet[dir], chain)
2599 cnt++;
2600 }
2601 }
2602
2603 if (cnt == 0) {
2604 SPTREE_RUNLOCK();
2605 return key_senderror(so, m, ENOENT);
2606 }
2607
2608 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2609 if (scope & IPSEC_POLICYSCOPE_GLOBAL) {
2610 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
2611 --cnt;
2612 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
2613 mhp->msg->sadb_msg_pid);
2614
2615 if (n != NULL)
2616 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2617 }
2618 }
2619 if (scope & IPSEC_POLICYSCOPE_IFNET) {
2620 TAILQ_FOREACH(sp, &V_sptree_ifnet[dir], chain) {
2621 --cnt;
2622 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
2623 mhp->msg->sadb_msg_pid);
2624
2625 if (n != NULL)
2626 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2627 }
2628 }
2629 }
2630
2631 SPTREE_RUNLOCK();
2632 m_freem(m);
2633 return (0);
2634 }
2635
2636 static struct mbuf *
key_setdumpsp(struct secpolicy * sp,u_int8_t type,u_int32_t seq,u_int32_t pid)2637 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq,
2638 u_int32_t pid)
2639 {
2640 struct mbuf *result = NULL, *m;
2641 struct seclifetime lt;
2642
2643 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt);
2644 if (!m)
2645 goto fail;
2646 result = m;
2647
2648 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2649 &sp->spidx.src.sa, sp->spidx.prefs,
2650 sp->spidx.ul_proto);
2651 if (!m)
2652 goto fail;
2653 m_cat(result, m);
2654
2655 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2656 &sp->spidx.dst.sa, sp->spidx.prefd,
2657 sp->spidx.ul_proto);
2658 if (!m)
2659 goto fail;
2660 m_cat(result, m);
2661
2662 m = key_sp2mbuf(sp);
2663 if (!m)
2664 goto fail;
2665 m_cat(result, m);
2666
2667 if(sp->lifetime){
2668 lt.addtime=sp->created;
2669 lt.usetime= sp->lastused;
2670 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT);
2671 if (!m)
2672 goto fail;
2673 m_cat(result, m);
2674
2675 lt.addtime=sp->lifetime;
2676 lt.usetime= sp->validtime;
2677 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD);
2678 if (!m)
2679 goto fail;
2680 m_cat(result, m);
2681 }
2682
2683 if ((result->m_flags & M_PKTHDR) == 0)
2684 goto fail;
2685
2686 if (result->m_len < sizeof(struct sadb_msg)) {
2687 result = m_pullup(result, sizeof(struct sadb_msg));
2688 if (result == NULL)
2689 goto fail;
2690 }
2691
2692 result->m_pkthdr.len = 0;
2693 for (m = result; m; m = m->m_next)
2694 result->m_pkthdr.len += m->m_len;
2695
2696 mtod(result, struct sadb_msg *)->sadb_msg_len =
2697 PFKEY_UNIT64(result->m_pkthdr.len);
2698
2699 return result;
2700
2701 fail:
2702 m_freem(result);
2703 return NULL;
2704 }
2705 /*
2706 * get PFKEY message length for security policy and request.
2707 */
2708 static size_t
key_getspreqmsglen(struct secpolicy * sp)2709 key_getspreqmsglen(struct secpolicy *sp)
2710 {
2711 size_t tlen, len;
2712 int i;
2713
2714 tlen = sizeof(struct sadb_x_policy);
2715 /* if is the policy for ipsec ? */
2716 if (sp->policy != IPSEC_POLICY_IPSEC)
2717 return (tlen);
2718
2719 /* get length of ipsec requests */
2720 for (i = 0; i < sp->tcount; i++) {
2721 len = sizeof(struct sadb_x_ipsecrequest)
2722 + sp->req[i]->saidx.src.sa.sa_len
2723 + sp->req[i]->saidx.dst.sa.sa_len;
2724
2725 tlen += PFKEY_ALIGN8(len);
2726 }
2727 return (tlen);
2728 }
2729
2730 /*
2731 * SADB_SPDEXPIRE processing
2732 * send
2733 * <base, address(SD), lifetime(CH), policy>
2734 * to KMD by PF_KEY.
2735 *
2736 * OUT: 0 : succeed
2737 * others : error number
2738 */
2739 static int
key_spdexpire(struct secpolicy * sp)2740 key_spdexpire(struct secpolicy *sp)
2741 {
2742 struct sadb_lifetime *lt;
2743 struct mbuf *result = NULL, *m;
2744 int len, error = -1;
2745
2746 IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
2747
2748 KEYDBG(KEY_STAMP,
2749 printf("%s: SP(%p)\n", __func__, sp));
2750 KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
2751
2752 /* set msg header */
2753 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0);
2754 if (!m) {
2755 error = ENOBUFS;
2756 goto fail;
2757 }
2758 result = m;
2759
2760 /* create lifetime extension (current and hard) */
2761 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
2762 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
2763 if (m == NULL) {
2764 error = ENOBUFS;
2765 goto fail;
2766 }
2767 m_align(m, len);
2768 m->m_len = len;
2769 bzero(mtod(m, caddr_t), len);
2770 lt = mtod(m, struct sadb_lifetime *);
2771 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2772 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2773 lt->sadb_lifetime_allocations = 0;
2774 lt->sadb_lifetime_bytes = 0;
2775 lt->sadb_lifetime_addtime = sp->created;
2776 lt->sadb_lifetime_usetime = sp->lastused;
2777 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
2778 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2779 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2780 lt->sadb_lifetime_allocations = 0;
2781 lt->sadb_lifetime_bytes = 0;
2782 lt->sadb_lifetime_addtime = sp->lifetime;
2783 lt->sadb_lifetime_usetime = sp->validtime;
2784 m_cat(result, m);
2785
2786 /* set sadb_address for source */
2787 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2788 &sp->spidx.src.sa,
2789 sp->spidx.prefs, sp->spidx.ul_proto);
2790 if (!m) {
2791 error = ENOBUFS;
2792 goto fail;
2793 }
2794 m_cat(result, m);
2795
2796 /* set sadb_address for destination */
2797 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2798 &sp->spidx.dst.sa,
2799 sp->spidx.prefd, sp->spidx.ul_proto);
2800 if (!m) {
2801 error = ENOBUFS;
2802 goto fail;
2803 }
2804 m_cat(result, m);
2805
2806 /* set secpolicy */
2807 m = key_sp2mbuf(sp);
2808 if (!m) {
2809 error = ENOBUFS;
2810 goto fail;
2811 }
2812 m_cat(result, m);
2813
2814 if ((result->m_flags & M_PKTHDR) == 0) {
2815 error = EINVAL;
2816 goto fail;
2817 }
2818
2819 if (result->m_len < sizeof(struct sadb_msg)) {
2820 result = m_pullup(result, sizeof(struct sadb_msg));
2821 if (result == NULL) {
2822 error = ENOBUFS;
2823 goto fail;
2824 }
2825 }
2826
2827 result->m_pkthdr.len = 0;
2828 for (m = result; m; m = m->m_next)
2829 result->m_pkthdr.len += m->m_len;
2830
2831 mtod(result, struct sadb_msg *)->sadb_msg_len =
2832 PFKEY_UNIT64(result->m_pkthdr.len);
2833
2834 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
2835
2836 fail:
2837 if (result)
2838 m_freem(result);
2839 return error;
2840 }
2841
2842 /* %%% SAD management */
2843 /*
2844 * allocating and initialize new SA head.
2845 * OUT: NULL : failure due to the lack of memory.
2846 * others : pointer to new SA head.
2847 */
2848 static struct secashead *
key_newsah(struct secasindex * saidx)2849 key_newsah(struct secasindex *saidx)
2850 {
2851 struct secashead *sah;
2852
2853 sah = malloc(sizeof(struct secashead), M_IPSEC_SAH,
2854 M_NOWAIT | M_ZERO);
2855 if (sah == NULL) {
2856 PFKEYSTAT_INC(in_nomem);
2857 return (NULL);
2858 }
2859 TAILQ_INIT(&sah->savtree_larval);
2860 TAILQ_INIT(&sah->savtree_alive);
2861 sah->saidx = *saidx;
2862 sah->state = SADB_SASTATE_DEAD;
2863 SAH_INITREF(sah);
2864
2865 KEYDBG(KEY_STAMP,
2866 printf("%s: SAH(%p)\n", __func__, sah));
2867 KEYDBG(KEY_DATA, kdebug_secash(sah, NULL));
2868 return (sah);
2869 }
2870
2871 static void
key_freesah(struct secashead ** psah)2872 key_freesah(struct secashead **psah)
2873 {
2874 struct secashead *sah = *psah;
2875
2876 if (SAH_DELREF(sah) == 0)
2877 return;
2878
2879 KEYDBG(KEY_STAMP,
2880 printf("%s: last reference to SAH(%p)\n", __func__, sah));
2881 KEYDBG(KEY_DATA, kdebug_secash(sah, NULL));
2882
2883 *psah = NULL;
2884 key_delsah(sah);
2885 }
2886
2887 static void
key_delsah(struct secashead * sah)2888 key_delsah(struct secashead *sah)
2889 {
2890 IPSEC_ASSERT(sah != NULL, ("NULL sah"));
2891 IPSEC_ASSERT(sah->state == SADB_SASTATE_DEAD,
2892 ("Attempt to free non DEAD SAH %p", sah));
2893 IPSEC_ASSERT(TAILQ_EMPTY(&sah->savtree_larval),
2894 ("Attempt to free SAH %p with LARVAL SA", sah));
2895 IPSEC_ASSERT(TAILQ_EMPTY(&sah->savtree_alive),
2896 ("Attempt to free SAH %p with ALIVE SA", sah));
2897
2898 free(sah, M_IPSEC_SAH);
2899 }
2900
2901 /*
2902 * allocating a new SA for key_add() and key_getspi() call,
2903 * and copy the values of mhp into new buffer.
2904 * When SAD message type is SADB_GETSPI set SA state to LARVAL.
2905 * For SADB_ADD create and initialize SA with MATURE state.
2906 * OUT: NULL : fail
2907 * others : pointer to new secasvar.
2908 */
2909 static struct secasvar *
key_newsav(const struct sadb_msghdr * mhp,struct secasindex * saidx,uint32_t spi,int * errp)2910 key_newsav(const struct sadb_msghdr *mhp, struct secasindex *saidx,
2911 uint32_t spi, int *errp)
2912 {
2913 struct secashead *sah;
2914 struct secasvar *sav;
2915 int isnew;
2916
2917 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2918 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2919 IPSEC_ASSERT(mhp->msg->sadb_msg_type == SADB_GETSPI ||
2920 mhp->msg->sadb_msg_type == SADB_ADD, ("wrong message type"));
2921
2922 sav = NULL;
2923 sah = NULL;
2924 /* check SPI value */
2925 switch (saidx->proto) {
2926 case IPPROTO_ESP:
2927 case IPPROTO_AH:
2928 /*
2929 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values
2930 * 1-255 reserved by IANA for future use,
2931 * 0 for implementation specific, local use.
2932 */
2933 if (ntohl(spi) <= 255) {
2934 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n",
2935 __func__, ntohl(spi)));
2936 *errp = EINVAL;
2937 goto done;
2938 }
2939 break;
2940 }
2941
2942 sav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT | M_ZERO);
2943 if (sav == NULL) {
2944 *errp = ENOBUFS;
2945 goto done;
2946 }
2947 sav->lock = malloc(sizeof(struct rmlock), M_IPSEC_MISC,
2948 M_NOWAIT | M_ZERO);
2949 if (sav->lock == NULL) {
2950 *errp = ENOBUFS;
2951 goto done;
2952 }
2953 rm_init(sav->lock, "ipsec association");
2954 sav->lft_c = uma_zalloc_pcpu(V_key_lft_zone, M_NOWAIT);
2955 if (sav->lft_c == NULL) {
2956 *errp = ENOBUFS;
2957 goto done;
2958 }
2959 counter_u64_zero(sav->lft_c_allocations);
2960 counter_u64_zero(sav->lft_c_bytes);
2961
2962 sav->spi = spi;
2963 sav->seq = mhp->msg->sadb_msg_seq;
2964 sav->state = SADB_SASTATE_LARVAL;
2965 sav->pid = (pid_t)mhp->msg->sadb_msg_pid;
2966 SAV_INITREF(sav);
2967 again:
2968 sah = key_getsah(saidx);
2969 if (sah == NULL) {
2970 /* create a new SA index */
2971 sah = key_newsah(saidx);
2972 if (sah == NULL) {
2973 ipseclog((LOG_DEBUG,
2974 "%s: No more memory.\n", __func__));
2975 *errp = ENOBUFS;
2976 goto done;
2977 }
2978 isnew = 1;
2979 } else
2980 isnew = 0;
2981
2982 sav->sah = sah;
2983 if (mhp->msg->sadb_msg_type == SADB_GETSPI) {
2984 sav->created = time_second;
2985 } else if (sav->state == SADB_SASTATE_LARVAL) {
2986 /*
2987 * Do not call key_setsaval() second time in case
2988 * of `goto again`. We will have MATURE state.
2989 */
2990 *errp = key_setsaval(sav, mhp);
2991 if (*errp != 0)
2992 goto done;
2993 sav->state = SADB_SASTATE_MATURE;
2994 }
2995
2996 SAHTREE_WLOCK();
2997 /*
2998 * Check that existing SAH wasn't unlinked.
2999 * Since we didn't hold the SAHTREE lock, it is possible,
3000 * that callout handler or key_flush() or key_delete() could
3001 * unlink this SAH.
3002 */
3003 if (isnew == 0 && sah->state == SADB_SASTATE_DEAD) {
3004 SAHTREE_WUNLOCK();
3005 key_freesah(&sah); /* reference from key_getsah() */
3006 goto again;
3007 }
3008 if (isnew != 0) {
3009 /*
3010 * Add new SAH into SADB.
3011 *
3012 * XXXAE: we can serialize key_add and key_getspi calls, so
3013 * several threads will not fight in the race.
3014 * Otherwise we should check under SAHTREE lock, that this
3015 * SAH would not added twice.
3016 */
3017 TAILQ_INSERT_HEAD(&V_sahtree, sah, chain);
3018 /* Add new SAH into hash by addresses */
3019 LIST_INSERT_HEAD(SAHADDRHASH_HASH(saidx), sah, addrhash);
3020 /* Now we are linked in the chain */
3021 sah->state = SADB_SASTATE_MATURE;
3022 /*
3023 * SAV references this new SAH.
3024 * In case of existing SAH we reuse reference
3025 * from key_getsah().
3026 */
3027 SAH_ADDREF(sah);
3028 }
3029 /* Link SAV with SAH */
3030 if (sav->state == SADB_SASTATE_MATURE)
3031 TAILQ_INSERT_HEAD(&sah->savtree_alive, sav, chain);
3032 else
3033 TAILQ_INSERT_HEAD(&sah->savtree_larval, sav, chain);
3034 /* Add SAV into SPI hash */
3035 LIST_INSERT_HEAD(SAVHASH_HASH(sav->spi), sav, spihash);
3036 SAHTREE_WUNLOCK();
3037 *errp = 0; /* success */
3038 done:
3039 if (*errp != 0) {
3040 if (sav != NULL) {
3041 if (sav->lock != NULL) {
3042 rm_destroy(sav->lock);
3043 free(sav->lock, M_IPSEC_MISC);
3044 }
3045 if (sav->lft_c != NULL)
3046 uma_zfree_pcpu(V_key_lft_zone, sav->lft_c);
3047 free(sav, M_IPSEC_SA), sav = NULL;
3048 }
3049 if (sah != NULL)
3050 key_freesah(&sah);
3051 if (*errp == ENOBUFS) {
3052 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3053 __func__));
3054 PFKEYSTAT_INC(in_nomem);
3055 }
3056 }
3057 return (sav);
3058 }
3059
3060 /*
3061 * free() SA variable entry.
3062 */
3063 static void
key_cleansav(struct secasvar * sav)3064 key_cleansav(struct secasvar *sav)
3065 {
3066
3067 if (sav->natt != NULL) {
3068 free(sav->natt, M_IPSEC_MISC);
3069 sav->natt = NULL;
3070 }
3071 if (sav->flags & SADB_X_EXT_F_CLONED)
3072 return;
3073 if (sav->tdb_xform != NULL) {
3074 sav->tdb_xform->xf_cleanup(sav);
3075 sav->tdb_xform = NULL;
3076 }
3077 if (sav->key_auth != NULL) {
3078 zfree(sav->key_auth->key_data, M_IPSEC_MISC);
3079 free(sav->key_auth, M_IPSEC_MISC);
3080 sav->key_auth = NULL;
3081 }
3082 if (sav->key_enc != NULL) {
3083 zfree(sav->key_enc->key_data, M_IPSEC_MISC);
3084 free(sav->key_enc, M_IPSEC_MISC);
3085 sav->key_enc = NULL;
3086 }
3087 if (sav->replay != NULL) {
3088 mtx_destroy(&sav->replay->lock);
3089 if (sav->replay->bitmap != NULL)
3090 free(sav->replay->bitmap, M_IPSEC_MISC);
3091 free(sav->replay, M_IPSEC_MISC);
3092 sav->replay = NULL;
3093 }
3094 if (sav->lft_h != NULL) {
3095 free(sav->lft_h, M_IPSEC_MISC);
3096 sav->lft_h = NULL;
3097 }
3098 if (sav->lft_s != NULL) {
3099 free(sav->lft_s, M_IPSEC_MISC);
3100 sav->lft_s = NULL;
3101 }
3102 }
3103
3104 /*
3105 * free() SA variable entry.
3106 */
3107 static void
key_delsav(struct secasvar * sav)3108 key_delsav(struct secasvar *sav)
3109 {
3110 IPSEC_ASSERT(sav != NULL, ("null sav"));
3111 IPSEC_ASSERT(sav->state == SADB_SASTATE_DEAD,
3112 ("attempt to free non DEAD SA %p", sav));
3113 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0",
3114 sav->refcnt));
3115
3116 /*
3117 * SA must be unlinked from the chain and hashtbl.
3118 * If SA was cloned, we leave all fields untouched,
3119 * except NAT-T config.
3120 */
3121 key_cleansav(sav);
3122 if ((sav->flags & SADB_X_EXT_F_CLONED) == 0) {
3123 rm_destroy(sav->lock);
3124 free(sav->lock, M_IPSEC_MISC);
3125 uma_zfree_pcpu(V_key_lft_zone, sav->lft_c);
3126 }
3127 free(sav, M_IPSEC_SA);
3128 }
3129
3130 /*
3131 * search SAH.
3132 * OUT:
3133 * NULL : not found
3134 * others : found, referenced pointer to a SAH.
3135 */
3136 static struct secashead *
key_getsah(struct secasindex * saidx)3137 key_getsah(struct secasindex *saidx)
3138 {
3139 SAHTREE_RLOCK_TRACKER;
3140 struct secashead *sah;
3141
3142 SAHTREE_RLOCK();
3143 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
3144 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID) != 0) {
3145 SAH_ADDREF(sah);
3146 break;
3147 }
3148 }
3149 SAHTREE_RUNLOCK();
3150 return (sah);
3151 }
3152
3153 /*
3154 * Check not to be duplicated SPI.
3155 * OUT:
3156 * 0 : not found
3157 * 1 : found SA with given SPI.
3158 */
3159 static int
key_checkspidup(uint32_t spi)3160 key_checkspidup(uint32_t spi)
3161 {
3162 SAHTREE_RLOCK_TRACKER;
3163 struct secasvar *sav;
3164
3165 /* Assume SPI is in network byte order */
3166 SAHTREE_RLOCK();
3167 LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
3168 if (sav->spi == spi)
3169 break;
3170 }
3171 SAHTREE_RUNLOCK();
3172 return (sav != NULL);
3173 }
3174
3175 /*
3176 * Search SA by SPI.
3177 * OUT:
3178 * NULL : not found
3179 * others : found, referenced pointer to a SA.
3180 */
3181 static struct secasvar *
key_getsavbyspi(uint32_t spi)3182 key_getsavbyspi(uint32_t spi)
3183 {
3184 SAHTREE_RLOCK_TRACKER;
3185 struct secasvar *sav;
3186
3187 /* Assume SPI is in network byte order */
3188 SAHTREE_RLOCK();
3189 LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
3190 if (sav->spi != spi)
3191 continue;
3192 SAV_ADDREF(sav);
3193 break;
3194 }
3195 SAHTREE_RUNLOCK();
3196 return (sav);
3197 }
3198
3199 static int
key_updatelifetimes(struct secasvar * sav,const struct sadb_msghdr * mhp)3200 key_updatelifetimes(struct secasvar *sav, const struct sadb_msghdr *mhp)
3201 {
3202 struct seclifetime *lft_h, *lft_s, *tmp;
3203
3204 /* Lifetime extension is optional, check that it is present. */
3205 if (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
3206 SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) {
3207 /*
3208 * In case of SADB_UPDATE we may need to change
3209 * existing lifetimes.
3210 */
3211 if (sav->state == SADB_SASTATE_MATURE) {
3212 lft_h = lft_s = NULL;
3213 goto reset;
3214 }
3215 return (0);
3216 }
3217 /* Both HARD and SOFT extensions must present */
3218 if ((SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
3219 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
3220 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
3221 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
3222 ipseclog((LOG_DEBUG,
3223 "%s: invalid message: missing required header.\n",
3224 __func__));
3225 return (EINVAL);
3226 }
3227 if (SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_HARD) ||
3228 SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_SOFT)) {
3229 ipseclog((LOG_DEBUG,
3230 "%s: invalid message: wrong header size.\n", __func__));
3231 return (EINVAL);
3232 }
3233 lft_h = key_dup_lifemsg((const struct sadb_lifetime *)
3234 mhp->ext[SADB_EXT_LIFETIME_HARD], M_IPSEC_MISC);
3235 if (lft_h == NULL) {
3236 PFKEYSTAT_INC(in_nomem);
3237 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
3238 return (ENOBUFS);
3239 }
3240 lft_s = key_dup_lifemsg((const struct sadb_lifetime *)
3241 mhp->ext[SADB_EXT_LIFETIME_SOFT], M_IPSEC_MISC);
3242 if (lft_s == NULL) {
3243 PFKEYSTAT_INC(in_nomem);
3244 free(lft_h, M_IPSEC_MISC);
3245 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
3246 return (ENOBUFS);
3247 }
3248 reset:
3249 if (sav->state != SADB_SASTATE_LARVAL) {
3250 /*
3251 * key_update() holds reference to this SA,
3252 * so it won't be deleted in meanwhile.
3253 */
3254 SECASVAR_WLOCK(sav);
3255 tmp = sav->lft_h;
3256 sav->lft_h = lft_h;
3257 lft_h = tmp;
3258
3259 tmp = sav->lft_s;
3260 sav->lft_s = lft_s;
3261 lft_s = tmp;
3262 SECASVAR_WUNLOCK(sav);
3263 if (lft_h != NULL)
3264 free(lft_h, M_IPSEC_MISC);
3265 if (lft_s != NULL)
3266 free(lft_s, M_IPSEC_MISC);
3267 return (0);
3268 }
3269 /* We can update lifetime without holding a lock */
3270 IPSEC_ASSERT(sav->lft_h == NULL, ("lft_h is already initialized\n"));
3271 IPSEC_ASSERT(sav->lft_s == NULL, ("lft_s is already initialized\n"));
3272 sav->lft_h = lft_h;
3273 sav->lft_s = lft_s;
3274 return (0);
3275 }
3276
3277 /*
3278 * copy SA values from PF_KEY message except *SPI, SEQ, PID and TYPE*.
3279 * You must update these if need. Expects only LARVAL SAs.
3280 * OUT: 0: success.
3281 * !0: failure.
3282 */
3283 static int
key_setsaval(struct secasvar * sav,const struct sadb_msghdr * mhp)3284 key_setsaval(struct secasvar *sav, const struct sadb_msghdr *mhp)
3285 {
3286 const struct sadb_sa *sa0;
3287 const struct sadb_key *key0;
3288 uint32_t replay;
3289 size_t len;
3290 int error;
3291
3292 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
3293 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
3294 IPSEC_ASSERT(sav->state == SADB_SASTATE_LARVAL,
3295 ("Attempt to update non LARVAL SA"));
3296
3297 /* XXX rewrite */
3298 error = key_setident(sav->sah, mhp);
3299 if (error != 0)
3300 goto fail;
3301
3302 /* SA */
3303 if (!SADB_CHECKHDR(mhp, SADB_EXT_SA)) {
3304 if (SADB_CHECKLEN(mhp, SADB_EXT_SA)) {
3305 error = EINVAL;
3306 goto fail;
3307 }
3308 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
3309 sav->alg_auth = sa0->sadb_sa_auth;
3310 sav->alg_enc = sa0->sadb_sa_encrypt;
3311 sav->flags = sa0->sadb_sa_flags;
3312 if ((sav->flags & SADB_KEY_FLAGS_MAX) != sav->flags) {
3313 ipseclog((LOG_DEBUG,
3314 "%s: invalid sa_flags 0x%08x.\n", __func__,
3315 sav->flags));
3316 error = EINVAL;
3317 goto fail;
3318 }
3319
3320 /* Optional replay window */
3321 replay = 0;
3322 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0)
3323 replay = sa0->sadb_sa_replay;
3324 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_SA_REPLAY)) {
3325 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA_REPLAY)) {
3326 error = EINVAL;
3327 goto fail;
3328 }
3329 replay = ((const struct sadb_x_sa_replay *)
3330 mhp->ext[SADB_X_EXT_SA_REPLAY])->sadb_x_sa_replay_replay;
3331
3332 if (replay > UINT32_MAX - 32) {
3333 ipseclog((LOG_DEBUG,
3334 "%s: replay window too big.\n", __func__));
3335 error = EINVAL;
3336 goto fail;
3337 }
3338
3339 replay = (replay + 7) >> 3;
3340 }
3341
3342 sav->replay = malloc(sizeof(struct secreplay), M_IPSEC_MISC,
3343 M_NOWAIT | M_ZERO);
3344 if (sav->replay == NULL) {
3345 PFKEYSTAT_INC(in_nomem);
3346 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3347 __func__));
3348 error = ENOBUFS;
3349 goto fail;
3350 }
3351 mtx_init(&sav->replay->lock, "ipsec replay", NULL, MTX_DEF);
3352
3353 if (replay != 0) {
3354 /* number of 32b blocks to be allocated */
3355 uint32_t bitmap_size;
3356
3357 /* RFC 6479:
3358 * - the allocated replay window size must be
3359 * a power of two.
3360 * - use an extra 32b block as a redundant window.
3361 */
3362 bitmap_size = 1;
3363 while (replay + 4 > bitmap_size)
3364 bitmap_size <<= 1;
3365 bitmap_size = bitmap_size / 4;
3366
3367 sav->replay->bitmap = malloc(
3368 bitmap_size * sizeof(uint32_t), M_IPSEC_MISC,
3369 M_NOWAIT | M_ZERO);
3370 if (sav->replay->bitmap == NULL) {
3371 PFKEYSTAT_INC(in_nomem);
3372 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3373 __func__));
3374 error = ENOBUFS;
3375 goto fail;
3376 }
3377 sav->replay->bitmap_size = bitmap_size;
3378 sav->replay->wsize = replay;
3379 }
3380 }
3381
3382 /* Authentication keys */
3383 if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH)) {
3384 if (SADB_CHECKLEN(mhp, SADB_EXT_KEY_AUTH)) {
3385 error = EINVAL;
3386 goto fail;
3387 }
3388 error = 0;
3389 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH];
3390 len = mhp->extlen[SADB_EXT_KEY_AUTH];
3391 switch (mhp->msg->sadb_msg_satype) {
3392 case SADB_SATYPE_AH:
3393 case SADB_SATYPE_ESP:
3394 case SADB_X_SATYPE_TCPSIGNATURE:
3395 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
3396 sav->alg_auth != SADB_X_AALG_NULL)
3397 error = EINVAL;
3398 if (key0->sadb_key_bits == 0 || (sizeof(struct sadb_key) +
3399 (key0->sadb_key_bits >> 3)) > len)
3400 error = EINVAL;
3401 break;
3402 case SADB_X_SATYPE_IPCOMP:
3403 default:
3404 error = EINVAL;
3405 break;
3406 }
3407 if (error) {
3408 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n",
3409 __func__));
3410 goto fail;
3411 }
3412
3413 sav->key_auth = key_dup_keymsg(key0, M_IPSEC_MISC);
3414 if (sav->key_auth == NULL ) {
3415 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3416 __func__));
3417 PFKEYSTAT_INC(in_nomem);
3418 error = ENOBUFS;
3419 goto fail;
3420 }
3421 }
3422
3423 /* Encryption key */
3424 if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT)) {
3425 if (SADB_CHECKLEN(mhp, SADB_EXT_KEY_ENCRYPT)) {
3426 error = EINVAL;
3427 goto fail;
3428 }
3429 error = 0;
3430 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT];
3431 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT];
3432 switch (mhp->msg->sadb_msg_satype) {
3433 case SADB_SATYPE_ESP:
3434 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
3435 sav->alg_enc != SADB_EALG_NULL) {
3436 error = EINVAL;
3437 break;
3438 }
3439 if (key0->sadb_key_bits == 0 || (sizeof(struct sadb_key) +
3440 (key0->sadb_key_bits >> 3)) > len) {
3441 error = EINVAL;
3442 break;
3443 }
3444 sav->key_enc = key_dup_keymsg(key0, M_IPSEC_MISC);
3445 if (sav->key_enc == NULL) {
3446 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3447 __func__));
3448 PFKEYSTAT_INC(in_nomem);
3449 error = ENOBUFS;
3450 goto fail;
3451 }
3452 break;
3453 case SADB_X_SATYPE_IPCOMP:
3454 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key)))
3455 error = EINVAL;
3456 sav->key_enc = NULL; /*just in case*/
3457 break;
3458 case SADB_SATYPE_AH:
3459 case SADB_X_SATYPE_TCPSIGNATURE:
3460 default:
3461 error = EINVAL;
3462 break;
3463 }
3464 if (error) {
3465 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n",
3466 __func__));
3467 goto fail;
3468 }
3469 }
3470
3471 /* set iv */
3472 sav->ivlen = 0;
3473 switch (mhp->msg->sadb_msg_satype) {
3474 case SADB_SATYPE_AH:
3475 if (sav->flags & SADB_X_EXT_DERIV) {
3476 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
3477 "given to AH SA.\n", __func__));
3478 error = EINVAL;
3479 goto fail;
3480 }
3481 if (sav->alg_enc != SADB_EALG_NONE) {
3482 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3483 "mismated.\n", __func__));
3484 error = EINVAL;
3485 goto fail;
3486 }
3487 error = xform_init(sav, XF_AH);
3488 break;
3489 case SADB_SATYPE_ESP:
3490 if ((sav->flags & (SADB_X_EXT_OLD | SADB_X_EXT_DERIV)) ==
3491 (SADB_X_EXT_OLD | SADB_X_EXT_DERIV)) {
3492 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
3493 "given to old-esp.\n", __func__));
3494 error = EINVAL;
3495 goto fail;
3496 }
3497 error = xform_init(sav, XF_ESP);
3498 break;
3499 case SADB_X_SATYPE_IPCOMP:
3500 if (sav->alg_auth != SADB_AALG_NONE) {
3501 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3502 "mismated.\n", __func__));
3503 error = EINVAL;
3504 goto fail;
3505 }
3506 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 &&
3507 ntohl(sav->spi) >= 0x10000) {
3508 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n",
3509 __func__));
3510 error = EINVAL;
3511 goto fail;
3512 }
3513 error = xform_init(sav, XF_IPCOMP);
3514 break;
3515 case SADB_X_SATYPE_TCPSIGNATURE:
3516 if (sav->alg_enc != SADB_EALG_NONE) {
3517 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3518 "mismated.\n", __func__));
3519 error = EINVAL;
3520 goto fail;
3521 }
3522 error = xform_init(sav, XF_TCPSIGNATURE);
3523 break;
3524 default:
3525 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__));
3526 error = EPROTONOSUPPORT;
3527 goto fail;
3528 }
3529 if (error) {
3530 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n",
3531 __func__, mhp->msg->sadb_msg_satype));
3532 goto fail;
3533 }
3534
3535 /* Handle NAT-T headers */
3536 error = key_setnatt(sav, mhp);
3537 if (error != 0)
3538 goto fail;
3539
3540 /* Initialize lifetime for CURRENT */
3541 sav->firstused = 0;
3542 sav->created = time_second;
3543
3544 /* lifetimes for HARD and SOFT */
3545 error = key_updatelifetimes(sav, mhp);
3546 if (error == 0)
3547 return (0);
3548 fail:
3549 key_cleansav(sav);
3550 return (error);
3551 }
3552
3553 /*
3554 * subroutine for SADB_GET and SADB_DUMP.
3555 */
3556 static struct mbuf *
key_setdumpsa(struct secasvar * sav,uint8_t type,uint8_t satype,uint32_t seq,uint32_t pid)3557 key_setdumpsa(struct secasvar *sav, uint8_t type, uint8_t satype,
3558 uint32_t seq, uint32_t pid)
3559 {
3560 struct seclifetime lft_c;
3561 struct mbuf *result = NULL, *tres = NULL, *m;
3562 int i, dumporder[] = {
3563 SADB_EXT_SA, SADB_X_EXT_SA2, SADB_X_EXT_SA_REPLAY,
3564 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
3565 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC,
3566 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY,
3567 SADB_EXT_KEY_AUTH, SADB_EXT_KEY_ENCRYPT,
3568 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST,
3569 SADB_EXT_SENSITIVITY,
3570 SADB_X_EXT_NAT_T_TYPE,
3571 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT,
3572 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR,
3573 SADB_X_EXT_NAT_T_FRAG,
3574 };
3575 uint32_t replay_count;
3576
3577 SECASVAR_RLOCK_TRACKER;
3578
3579 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt);
3580 if (m == NULL)
3581 goto fail;
3582 result = m;
3583
3584 for (i = nitems(dumporder) - 1; i >= 0; i--) {
3585 m = NULL;
3586 switch (dumporder[i]) {
3587 case SADB_EXT_SA:
3588 m = key_setsadbsa(sav);
3589 if (!m)
3590 goto fail;
3591 break;
3592
3593 case SADB_X_EXT_SA2: {
3594 SECASVAR_RLOCK(sav);
3595 replay_count = sav->replay ? sav->replay->count : 0;
3596 SECASVAR_RUNLOCK(sav);
3597 m = key_setsadbxsa2(sav->sah->saidx.mode, replay_count,
3598 sav->sah->saidx.reqid);
3599 if (!m)
3600 goto fail;
3601 break;
3602 }
3603 case SADB_X_EXT_SA_REPLAY:
3604 if (sav->replay == NULL ||
3605 sav->replay->wsize <= UINT8_MAX)
3606 continue;
3607
3608 m = key_setsadbxsareplay(sav->replay->wsize);
3609 if (!m)
3610 goto fail;
3611 break;
3612
3613 case SADB_EXT_ADDRESS_SRC:
3614 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
3615 &sav->sah->saidx.src.sa,
3616 FULLMASK, IPSEC_ULPROTO_ANY);
3617 if (!m)
3618 goto fail;
3619 break;
3620
3621 case SADB_EXT_ADDRESS_DST:
3622 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
3623 &sav->sah->saidx.dst.sa,
3624 FULLMASK, IPSEC_ULPROTO_ANY);
3625 if (!m)
3626 goto fail;
3627 break;
3628
3629 case SADB_EXT_KEY_AUTH:
3630 if (!sav->key_auth)
3631 continue;
3632 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH);
3633 if (!m)
3634 goto fail;
3635 break;
3636
3637 case SADB_EXT_KEY_ENCRYPT:
3638 if (!sav->key_enc)
3639 continue;
3640 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT);
3641 if (!m)
3642 goto fail;
3643 break;
3644
3645 case SADB_EXT_LIFETIME_CURRENT:
3646 lft_c.addtime = sav->created;
3647 lft_c.allocations = (uint32_t)counter_u64_fetch(
3648 sav->lft_c_allocations);
3649 lft_c.bytes = counter_u64_fetch(sav->lft_c_bytes);
3650 lft_c.usetime = sav->firstused;
3651 m = key_setlifetime(&lft_c, SADB_EXT_LIFETIME_CURRENT);
3652 if (!m)
3653 goto fail;
3654 break;
3655
3656 case SADB_EXT_LIFETIME_HARD:
3657 if (!sav->lft_h)
3658 continue;
3659 m = key_setlifetime(sav->lft_h,
3660 SADB_EXT_LIFETIME_HARD);
3661 if (!m)
3662 goto fail;
3663 break;
3664
3665 case SADB_EXT_LIFETIME_SOFT:
3666 if (!sav->lft_s)
3667 continue;
3668 m = key_setlifetime(sav->lft_s,
3669 SADB_EXT_LIFETIME_SOFT);
3670
3671 if (!m)
3672 goto fail;
3673 break;
3674
3675 case SADB_X_EXT_NAT_T_TYPE:
3676 if (sav->natt == NULL)
3677 continue;
3678 m = key_setsadbxtype(UDP_ENCAP_ESPINUDP);
3679 if (!m)
3680 goto fail;
3681 break;
3682
3683 case SADB_X_EXT_NAT_T_DPORT:
3684 if (sav->natt == NULL)
3685 continue;
3686 m = key_setsadbxport(sav->natt->dport,
3687 SADB_X_EXT_NAT_T_DPORT);
3688 if (!m)
3689 goto fail;
3690 break;
3691
3692 case SADB_X_EXT_NAT_T_SPORT:
3693 if (sav->natt == NULL)
3694 continue;
3695 m = key_setsadbxport(sav->natt->sport,
3696 SADB_X_EXT_NAT_T_SPORT);
3697 if (!m)
3698 goto fail;
3699 break;
3700
3701 case SADB_X_EXT_NAT_T_OAI:
3702 if (sav->natt == NULL ||
3703 (sav->natt->flags & IPSEC_NATT_F_OAI) == 0)
3704 continue;
3705 m = key_setsadbaddr(SADB_X_EXT_NAT_T_OAI,
3706 &sav->natt->oai.sa, FULLMASK, IPSEC_ULPROTO_ANY);
3707 if (!m)
3708 goto fail;
3709 break;
3710 case SADB_X_EXT_NAT_T_OAR:
3711 if (sav->natt == NULL ||
3712 (sav->natt->flags & IPSEC_NATT_F_OAR) == 0)
3713 continue;
3714 m = key_setsadbaddr(SADB_X_EXT_NAT_T_OAR,
3715 &sav->natt->oar.sa, FULLMASK, IPSEC_ULPROTO_ANY);
3716 if (!m)
3717 goto fail;
3718 break;
3719 case SADB_X_EXT_NAT_T_FRAG:
3720 /* We do not (yet) support those. */
3721 continue;
3722
3723 case SADB_EXT_ADDRESS_PROXY:
3724 case SADB_EXT_IDENTITY_SRC:
3725 case SADB_EXT_IDENTITY_DST:
3726 /* XXX: should we brought from SPD ? */
3727 case SADB_EXT_SENSITIVITY:
3728 default:
3729 continue;
3730 }
3731
3732 if (!m)
3733 goto fail;
3734 if (tres)
3735 m_cat(m, tres);
3736 tres = m;
3737 }
3738
3739 m_cat(result, tres);
3740 tres = NULL;
3741 if (result->m_len < sizeof(struct sadb_msg)) {
3742 result = m_pullup(result, sizeof(struct sadb_msg));
3743 if (result == NULL)
3744 goto fail;
3745 }
3746
3747 result->m_pkthdr.len = 0;
3748 for (m = result; m; m = m->m_next)
3749 result->m_pkthdr.len += m->m_len;
3750
3751 mtod(result, struct sadb_msg *)->sadb_msg_len =
3752 PFKEY_UNIT64(result->m_pkthdr.len);
3753
3754 return result;
3755
3756 fail:
3757 m_freem(result);
3758 m_freem(tres);
3759 return NULL;
3760 }
3761
3762 /*
3763 * set data into sadb_msg.
3764 */
3765 static struct mbuf *
key_setsadbmsg(u_int8_t type,u_int16_t tlen,u_int8_t satype,u_int32_t seq,pid_t pid,u_int16_t reserved)3766 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq,
3767 pid_t pid, u_int16_t reserved)
3768 {
3769 struct mbuf *m;
3770 struct sadb_msg *p;
3771 int len;
3772
3773 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
3774 if (len > MCLBYTES)
3775 return NULL;
3776 m = key_mget(len);
3777 if (m == NULL)
3778 return NULL;
3779 m->m_pkthdr.len = m->m_len = len;
3780 m->m_next = NULL;
3781
3782 p = mtod(m, struct sadb_msg *);
3783
3784 bzero(p, len);
3785 p->sadb_msg_version = PF_KEY_V2;
3786 p->sadb_msg_type = type;
3787 p->sadb_msg_errno = 0;
3788 p->sadb_msg_satype = satype;
3789 p->sadb_msg_len = PFKEY_UNIT64(tlen);
3790 p->sadb_msg_reserved = reserved;
3791 p->sadb_msg_seq = seq;
3792 p->sadb_msg_pid = (u_int32_t)pid;
3793
3794 return m;
3795 }
3796
3797 /*
3798 * copy secasvar data into sadb_address.
3799 */
3800 static struct mbuf *
key_setsadbsa(struct secasvar * sav)3801 key_setsadbsa(struct secasvar *sav)
3802 {
3803 struct mbuf *m;
3804 struct sadb_sa *p;
3805 int len;
3806
3807 len = PFKEY_ALIGN8(sizeof(struct sadb_sa));
3808 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3809 if (m == NULL)
3810 return (NULL);
3811 m_align(m, len);
3812 m->m_len = len;
3813 p = mtod(m, struct sadb_sa *);
3814 bzero(p, len);
3815 p->sadb_sa_len = PFKEY_UNIT64(len);
3816 p->sadb_sa_exttype = SADB_EXT_SA;
3817 p->sadb_sa_spi = sav->spi;
3818 p->sadb_sa_replay = sav->replay ?
3819 (sav->replay->wsize > UINT8_MAX ? UINT8_MAX :
3820 sav->replay->wsize): 0;
3821 p->sadb_sa_state = sav->state;
3822 p->sadb_sa_auth = sav->alg_auth;
3823 p->sadb_sa_encrypt = sav->alg_enc;
3824 p->sadb_sa_flags = sav->flags & SADB_KEY_FLAGS_MAX;
3825 return (m);
3826 }
3827
3828 /*
3829 * set data into sadb_address.
3830 */
3831 static struct mbuf *
key_setsadbaddr(u_int16_t exttype,const struct sockaddr * saddr,u_int8_t prefixlen,u_int16_t ul_proto)3832 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr,
3833 u_int8_t prefixlen, u_int16_t ul_proto)
3834 {
3835 struct mbuf *m;
3836 struct sadb_address *p;
3837 size_t len;
3838
3839 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) +
3840 PFKEY_ALIGN8(saddr->sa_len);
3841 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3842 if (m == NULL)
3843 return (NULL);
3844 m_align(m, len);
3845 m->m_len = len;
3846 p = mtod(m, struct sadb_address *);
3847
3848 bzero(p, len);
3849 p->sadb_address_len = PFKEY_UNIT64(len);
3850 p->sadb_address_exttype = exttype;
3851 p->sadb_address_proto = ul_proto;
3852 if (prefixlen == FULLMASK) {
3853 switch (saddr->sa_family) {
3854 case AF_INET:
3855 prefixlen = sizeof(struct in_addr) << 3;
3856 break;
3857 case AF_INET6:
3858 prefixlen = sizeof(struct in6_addr) << 3;
3859 break;
3860 default:
3861 ; /*XXX*/
3862 }
3863 }
3864 p->sadb_address_prefixlen = prefixlen;
3865 p->sadb_address_reserved = 0;
3866
3867 bcopy(saddr,
3868 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)),
3869 saddr->sa_len);
3870
3871 return m;
3872 }
3873
3874 /*
3875 * set data into sadb_x_sa2.
3876 */
3877 static struct mbuf *
key_setsadbxsa2(u_int8_t mode,u_int32_t seq,u_int32_t reqid)3878 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid)
3879 {
3880 struct mbuf *m;
3881 struct sadb_x_sa2 *p;
3882 size_t len;
3883
3884 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2));
3885 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3886 if (m == NULL)
3887 return (NULL);
3888 m_align(m, len);
3889 m->m_len = len;
3890 p = mtod(m, struct sadb_x_sa2 *);
3891
3892 bzero(p, len);
3893 p->sadb_x_sa2_len = PFKEY_UNIT64(len);
3894 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
3895 p->sadb_x_sa2_mode = mode;
3896 p->sadb_x_sa2_reserved1 = 0;
3897 p->sadb_x_sa2_reserved2 = 0;
3898 p->sadb_x_sa2_sequence = seq;
3899 p->sadb_x_sa2_reqid = reqid;
3900
3901 return m;
3902 }
3903
3904 /*
3905 * Set data into sadb_x_sa_replay.
3906 */
3907 static struct mbuf *
key_setsadbxsareplay(u_int32_t replay)3908 key_setsadbxsareplay(u_int32_t replay)
3909 {
3910 struct mbuf *m;
3911 struct sadb_x_sa_replay *p;
3912 size_t len;
3913
3914 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa_replay));
3915 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3916 if (m == NULL)
3917 return (NULL);
3918 m_align(m, len);
3919 m->m_len = len;
3920 p = mtod(m, struct sadb_x_sa_replay *);
3921
3922 bzero(p, len);
3923 p->sadb_x_sa_replay_len = PFKEY_UNIT64(len);
3924 p->sadb_x_sa_replay_exttype = SADB_X_EXT_SA_REPLAY;
3925 p->sadb_x_sa_replay_replay = (replay << 3);
3926
3927 return m;
3928 }
3929
3930 /*
3931 * Set a type in sadb_x_nat_t_type.
3932 */
3933 static struct mbuf *
key_setsadbxtype(u_int16_t type)3934 key_setsadbxtype(u_int16_t type)
3935 {
3936 struct mbuf *m;
3937 size_t len;
3938 struct sadb_x_nat_t_type *p;
3939
3940 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type));
3941
3942 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3943 if (m == NULL)
3944 return (NULL);
3945 m_align(m, len);
3946 m->m_len = len;
3947 p = mtod(m, struct sadb_x_nat_t_type *);
3948
3949 bzero(p, len);
3950 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len);
3951 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
3952 p->sadb_x_nat_t_type_type = type;
3953
3954 return (m);
3955 }
3956 /*
3957 * Set a port in sadb_x_nat_t_port.
3958 * In contrast to default RFC 2367 behaviour, port is in network byte order.
3959 */
3960 static struct mbuf *
key_setsadbxport(u_int16_t port,u_int16_t type)3961 key_setsadbxport(u_int16_t port, u_int16_t type)
3962 {
3963 struct mbuf *m;
3964 size_t len;
3965 struct sadb_x_nat_t_port *p;
3966
3967 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port));
3968
3969 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3970 if (m == NULL)
3971 return (NULL);
3972 m_align(m, len);
3973 m->m_len = len;
3974 p = mtod(m, struct sadb_x_nat_t_port *);
3975
3976 bzero(p, len);
3977 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len);
3978 p->sadb_x_nat_t_port_exttype = type;
3979 p->sadb_x_nat_t_port_port = port;
3980
3981 return (m);
3982 }
3983
3984 /*
3985 * Get port from sockaddr. Port is in network byte order.
3986 */
3987 uint16_t
key_portfromsaddr(struct sockaddr * sa)3988 key_portfromsaddr(struct sockaddr *sa)
3989 {
3990
3991 switch (sa->sa_family) {
3992 #ifdef INET
3993 case AF_INET:
3994 return ((struct sockaddr_in *)sa)->sin_port;
3995 #endif
3996 #ifdef INET6
3997 case AF_INET6:
3998 return ((struct sockaddr_in6 *)sa)->sin6_port;
3999 #endif
4000 }
4001 return (0);
4002 }
4003
4004 /*
4005 * Set port in struct sockaddr. Port is in network byte order.
4006 */
4007 void
key_porttosaddr(struct sockaddr * sa,uint16_t port)4008 key_porttosaddr(struct sockaddr *sa, uint16_t port)
4009 {
4010
4011 switch (sa->sa_family) {
4012 #ifdef INET
4013 case AF_INET:
4014 ((struct sockaddr_in *)sa)->sin_port = port;
4015 break;
4016 #endif
4017 #ifdef INET6
4018 case AF_INET6:
4019 ((struct sockaddr_in6 *)sa)->sin6_port = port;
4020 break;
4021 #endif
4022 default:
4023 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n",
4024 __func__, sa->sa_family));
4025 break;
4026 }
4027 }
4028
4029 /*
4030 * set data into sadb_x_policy
4031 */
4032 static struct mbuf *
key_setsadbxpolicy(u_int16_t type,u_int8_t dir,u_int32_t id,u_int32_t priority)4033 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id, u_int32_t priority)
4034 {
4035 struct mbuf *m;
4036 struct sadb_x_policy *p;
4037 size_t len;
4038
4039 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy));
4040 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
4041 if (m == NULL)
4042 return (NULL);
4043 m_align(m, len);
4044 m->m_len = len;
4045 p = mtod(m, struct sadb_x_policy *);
4046
4047 bzero(p, len);
4048 p->sadb_x_policy_len = PFKEY_UNIT64(len);
4049 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
4050 p->sadb_x_policy_type = type;
4051 p->sadb_x_policy_dir = dir;
4052 p->sadb_x_policy_id = id;
4053 p->sadb_x_policy_priority = priority;
4054
4055 return m;
4056 }
4057
4058 /* %%% utilities */
4059 /* Take a key message (sadb_key) from the socket and turn it into one
4060 * of the kernel's key structures (seckey).
4061 *
4062 * IN: pointer to the src
4063 * OUT: NULL no more memory
4064 */
4065 struct seckey *
key_dup_keymsg(const struct sadb_key * src,struct malloc_type * type)4066 key_dup_keymsg(const struct sadb_key *src, struct malloc_type *type)
4067 {
4068 struct seckey *dst;
4069 size_t len;
4070
4071 dst = malloc(sizeof(*dst), type, M_NOWAIT);
4072 if (dst != NULL) {
4073 len = src->sadb_key_bits >> 3;
4074 dst->bits = src->sadb_key_bits;
4075 dst->key_data = malloc(len, type, M_NOWAIT);
4076 if (dst->key_data != NULL) {
4077 bcopy((const char *)(src + 1), dst->key_data, len);
4078 } else {
4079 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
4080 __func__));
4081 free(dst, type);
4082 dst = NULL;
4083 }
4084 } else {
4085 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
4086 __func__));
4087 }
4088 return (dst);
4089 }
4090
4091 /* Take a lifetime message (sadb_lifetime) passed in on a socket and
4092 * turn it into one of the kernel's lifetime structures (seclifetime).
4093 *
4094 * IN: pointer to the destination, source and malloc type
4095 * OUT: NULL, no more memory
4096 */
4097
4098 static struct seclifetime *
key_dup_lifemsg(const struct sadb_lifetime * src,struct malloc_type * type)4099 key_dup_lifemsg(const struct sadb_lifetime *src, struct malloc_type *type)
4100 {
4101 struct seclifetime *dst;
4102
4103 dst = malloc(sizeof(*dst), type, M_NOWAIT);
4104 if (dst == NULL) {
4105 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
4106 return (NULL);
4107 }
4108 dst->allocations = src->sadb_lifetime_allocations;
4109 dst->bytes = src->sadb_lifetime_bytes;
4110 dst->addtime = src->sadb_lifetime_addtime;
4111 dst->usetime = src->sadb_lifetime_usetime;
4112 return (dst);
4113 }
4114
4115 /*
4116 * compare two secasindex structure.
4117 * flag can specify to compare 2 saidxes.
4118 * compare two secasindex structure without both mode and reqid.
4119 * don't compare port.
4120 * IN:
4121 * saidx0: source, it can be in SAD.
4122 * saidx1: object.
4123 * OUT:
4124 * 1 : equal
4125 * 0 : not equal
4126 */
4127 static int
key_cmpsaidx(const struct secasindex * saidx0,const struct secasindex * saidx1,int flag)4128 key_cmpsaidx(const struct secasindex *saidx0, const struct secasindex *saidx1,
4129 int flag)
4130 {
4131
4132 /* sanity */
4133 if (saidx0 == NULL && saidx1 == NULL)
4134 return 1;
4135
4136 if (saidx0 == NULL || saidx1 == NULL)
4137 return 0;
4138
4139 if (saidx0->proto != saidx1->proto)
4140 return 0;
4141
4142 if (flag == CMP_EXACTLY) {
4143 if (saidx0->mode != saidx1->mode)
4144 return 0;
4145 if (saidx0->reqid != saidx1->reqid)
4146 return 0;
4147 if (bcmp(&saidx0->src, &saidx1->src,
4148 saidx0->src.sa.sa_len) != 0 ||
4149 bcmp(&saidx0->dst, &saidx1->dst,
4150 saidx0->dst.sa.sa_len) != 0)
4151 return 0;
4152 } else {
4153 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */
4154 if (flag == CMP_MODE_REQID || flag == CMP_REQID) {
4155 /*
4156 * If reqid of SPD is non-zero, unique SA is required.
4157 * The result must be of same reqid in this case.
4158 */
4159 if (saidx1->reqid != 0 &&
4160 saidx0->reqid != saidx1->reqid)
4161 return 0;
4162 }
4163
4164 if (flag == CMP_MODE_REQID) {
4165 if (saidx0->mode != IPSEC_MODE_ANY
4166 && saidx0->mode != saidx1->mode)
4167 return 0;
4168 }
4169
4170 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0)
4171 return 0;
4172 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0)
4173 return 0;
4174 }
4175
4176 return 1;
4177 }
4178
4179 /*
4180 * compare two secindex structure exactly.
4181 * IN:
4182 * spidx0: source, it is often in SPD.
4183 * spidx1: object, it is often from PFKEY message.
4184 * OUT:
4185 * 1 : equal
4186 * 0 : not equal
4187 */
4188 static int
key_cmpspidx_exactly(struct secpolicyindex * spidx0,struct secpolicyindex * spidx1)4189 key_cmpspidx_exactly(struct secpolicyindex *spidx0,
4190 struct secpolicyindex *spidx1)
4191 {
4192 /* sanity */
4193 if (spidx0 == NULL && spidx1 == NULL)
4194 return 1;
4195
4196 if (spidx0 == NULL || spidx1 == NULL)
4197 return 0;
4198
4199 if (spidx0->prefs != spidx1->prefs
4200 || spidx0->prefd != spidx1->prefd
4201 || spidx0->ul_proto != spidx1->ul_proto
4202 || spidx0->dir != spidx1->dir)
4203 return 0;
4204
4205 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 &&
4206 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0;
4207 }
4208
4209 /*
4210 * compare two secindex structure with mask.
4211 * IN:
4212 * spidx0: source, it is often in SPD.
4213 * spidx1: object, it is often from IP header.
4214 * OUT:
4215 * 1 : equal
4216 * 0 : not equal
4217 */
4218 static int
key_cmpspidx_withmask(struct secpolicyindex * spidx0,struct secpolicyindex * spidx1)4219 key_cmpspidx_withmask(struct secpolicyindex *spidx0,
4220 struct secpolicyindex *spidx1)
4221 {
4222 /* sanity */
4223 if (spidx0 == NULL && spidx1 == NULL)
4224 return 1;
4225
4226 if (spidx0 == NULL || spidx1 == NULL)
4227 return 0;
4228
4229 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family ||
4230 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family ||
4231 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len ||
4232 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len)
4233 return 0;
4234
4235 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */
4236 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY
4237 && spidx0->ul_proto != spidx1->ul_proto)
4238 return 0;
4239
4240 switch (spidx0->src.sa.sa_family) {
4241 case AF_INET:
4242 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY
4243 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port)
4244 return 0;
4245 if (!key_bbcmp(&spidx0->src.sin.sin_addr,
4246 &spidx1->src.sin.sin_addr, spidx0->prefs))
4247 return 0;
4248 break;
4249 case AF_INET6:
4250 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY
4251 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port)
4252 return 0;
4253 /*
4254 * scope_id check. if sin6_scope_id is 0, we regard it
4255 * as a wildcard scope, which matches any scope zone ID.
4256 */
4257 if (spidx0->src.sin6.sin6_scope_id &&
4258 spidx1->src.sin6.sin6_scope_id &&
4259 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id)
4260 return 0;
4261 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr,
4262 &spidx1->src.sin6.sin6_addr, spidx0->prefs))
4263 return 0;
4264 break;
4265 default:
4266 /* XXX */
4267 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0)
4268 return 0;
4269 break;
4270 }
4271
4272 switch (spidx0->dst.sa.sa_family) {
4273 case AF_INET:
4274 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY
4275 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port)
4276 return 0;
4277 if (!key_bbcmp(&spidx0->dst.sin.sin_addr,
4278 &spidx1->dst.sin.sin_addr, spidx0->prefd))
4279 return 0;
4280 break;
4281 case AF_INET6:
4282 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY
4283 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port)
4284 return 0;
4285 /*
4286 * scope_id check. if sin6_scope_id is 0, we regard it
4287 * as a wildcard scope, which matches any scope zone ID.
4288 */
4289 if (spidx0->dst.sin6.sin6_scope_id &&
4290 spidx1->dst.sin6.sin6_scope_id &&
4291 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id)
4292 return 0;
4293 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr,
4294 &spidx1->dst.sin6.sin6_addr, spidx0->prefd))
4295 return 0;
4296 break;
4297 default:
4298 /* XXX */
4299 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0)
4300 return 0;
4301 break;
4302 }
4303
4304 /* XXX Do we check other field ? e.g. flowinfo */
4305
4306 return 1;
4307 }
4308
4309 #ifdef satosin
4310 #undef satosin
4311 #endif
4312 #define satosin(s) ((const struct sockaddr_in *)s)
4313 #ifdef satosin6
4314 #undef satosin6
4315 #endif
4316 #define satosin6(s) ((const struct sockaddr_in6 *)s)
4317 /* returns 0 on match */
4318 int
key_sockaddrcmp(const struct sockaddr * sa1,const struct sockaddr * sa2,int port)4319 key_sockaddrcmp(const struct sockaddr *sa1, const struct sockaddr *sa2,
4320 int port)
4321 {
4322 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
4323 return 1;
4324
4325 switch (sa1->sa_family) {
4326 #ifdef INET
4327 case AF_INET:
4328 if (sa1->sa_len != sizeof(struct sockaddr_in))
4329 return 1;
4330 if (satosin(sa1)->sin_addr.s_addr !=
4331 satosin(sa2)->sin_addr.s_addr) {
4332 return 1;
4333 }
4334 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port)
4335 return 1;
4336 break;
4337 #endif
4338 #ifdef INET6
4339 case AF_INET6:
4340 if (sa1->sa_len != sizeof(struct sockaddr_in6))
4341 return 1; /*EINVAL*/
4342 if (satosin6(sa1)->sin6_scope_id !=
4343 satosin6(sa2)->sin6_scope_id) {
4344 return 1;
4345 }
4346 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr,
4347 &satosin6(sa2)->sin6_addr)) {
4348 return 1;
4349 }
4350 if (port &&
4351 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) {
4352 return 1;
4353 }
4354 break;
4355 #endif
4356 default:
4357 if (bcmp(sa1, sa2, sa1->sa_len) != 0)
4358 return 1;
4359 break;
4360 }
4361
4362 return 0;
4363 }
4364
4365 /* returns 0 on match */
4366 int
key_sockaddrcmp_withmask(const struct sockaddr * sa1,const struct sockaddr * sa2,size_t mask)4367 key_sockaddrcmp_withmask(const struct sockaddr *sa1,
4368 const struct sockaddr *sa2, size_t mask)
4369 {
4370 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
4371 return (1);
4372
4373 switch (sa1->sa_family) {
4374 #ifdef INET
4375 case AF_INET:
4376 return (!key_bbcmp(&satosin(sa1)->sin_addr,
4377 &satosin(sa2)->sin_addr, mask));
4378 #endif
4379 #ifdef INET6
4380 case AF_INET6:
4381 if (satosin6(sa1)->sin6_scope_id !=
4382 satosin6(sa2)->sin6_scope_id)
4383 return (1);
4384 return (!key_bbcmp(&satosin6(sa1)->sin6_addr,
4385 &satosin6(sa2)->sin6_addr, mask));
4386 #endif
4387 }
4388 return (1);
4389 }
4390 #undef satosin
4391 #undef satosin6
4392
4393 /*
4394 * compare two buffers with mask.
4395 * IN:
4396 * addr1: source
4397 * addr2: object
4398 * bits: Number of bits to compare
4399 * OUT:
4400 * 1 : equal
4401 * 0 : not equal
4402 */
4403 static int
key_bbcmp(const void * a1,const void * a2,u_int bits)4404 key_bbcmp(const void *a1, const void *a2, u_int bits)
4405 {
4406 const unsigned char *p1 = a1;
4407 const unsigned char *p2 = a2;
4408
4409 /* XXX: This could be considerably faster if we compare a word
4410 * at a time, but it is complicated on LSB Endian machines */
4411
4412 /* Handle null pointers */
4413 if (p1 == NULL || p2 == NULL)
4414 return (p1 == p2);
4415
4416 while (bits >= 8) {
4417 if (*p1++ != *p2++)
4418 return 0;
4419 bits -= 8;
4420 }
4421
4422 if (bits > 0) {
4423 u_int8_t mask = ~((1<<(8-bits))-1);
4424 if ((*p1 & mask) != (*p2 & mask))
4425 return 0;
4426 }
4427 return 1; /* Match! */
4428 }
4429
4430 static void
key_flush_spd(time_t now)4431 key_flush_spd(time_t now)
4432 {
4433 SPTREE_RLOCK_TRACKER;
4434 struct secpolicy_list drainq;
4435 struct secpolicy *sp, *nextsp;
4436 u_int dir;
4437
4438 LIST_INIT(&drainq);
4439 SPTREE_RLOCK();
4440 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
4441 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
4442 if (sp->lifetime == 0 && sp->validtime == 0)
4443 continue;
4444 if ((sp->lifetime &&
4445 now - sp->created > sp->lifetime) ||
4446 (sp->validtime &&
4447 now - sp->lastused > sp->validtime)) {
4448 /* Hold extra reference to send SPDEXPIRE */
4449 SP_ADDREF(sp);
4450 LIST_INSERT_HEAD(&drainq, sp, drainq);
4451 }
4452 }
4453 }
4454 SPTREE_RUNLOCK();
4455 if (LIST_EMPTY(&drainq))
4456 return;
4457
4458 SPTREE_WLOCK();
4459 sp = LIST_FIRST(&drainq);
4460 while (sp != NULL) {
4461 nextsp = LIST_NEXT(sp, drainq);
4462 /* Check that SP is still linked */
4463 if (sp->state != IPSEC_SPSTATE_ALIVE) {
4464 LIST_REMOVE(sp, drainq);
4465 key_freesp(&sp); /* release extra reference */
4466 sp = nextsp;
4467 continue;
4468 }
4469 TAILQ_REMOVE(&V_sptree[sp->spidx.dir], sp, chain);
4470 V_spd_size--;
4471 LIST_REMOVE(sp, idhash);
4472 sp->state = IPSEC_SPSTATE_DEAD;
4473 sp = nextsp;
4474 }
4475 V_sp_genid++;
4476 SPTREE_WUNLOCK();
4477 if (SPDCACHE_ENABLED())
4478 spdcache_clear();
4479
4480 sp = LIST_FIRST(&drainq);
4481 while (sp != NULL) {
4482 nextsp = LIST_NEXT(sp, drainq);
4483 key_spdexpire(sp);
4484 key_freesp(&sp); /* release extra reference */
4485 key_freesp(&sp); /* release last reference */
4486 sp = nextsp;
4487 }
4488 }
4489
4490 static void
key_flush_sad(time_t now)4491 key_flush_sad(time_t now)
4492 {
4493 SAHTREE_RLOCK_TRACKER;
4494 struct secashead_list emptyq;
4495 struct secasvar_list drainq, hexpireq, sexpireq, freeq;
4496 struct secashead *sah, *nextsah;
4497 struct secasvar *sav, *nextsav;
4498
4499 SECASVAR_RLOCK_TRACKER;
4500
4501 LIST_INIT(&drainq);
4502 LIST_INIT(&hexpireq);
4503 LIST_INIT(&sexpireq);
4504 LIST_INIT(&emptyq);
4505
4506 SAHTREE_RLOCK();
4507 TAILQ_FOREACH(sah, &V_sahtree, chain) {
4508 /* Check for empty SAH */
4509 if (TAILQ_EMPTY(&sah->savtree_larval) &&
4510 TAILQ_EMPTY(&sah->savtree_alive)) {
4511 SAH_ADDREF(sah);
4512 LIST_INSERT_HEAD(&emptyq, sah, drainq);
4513 continue;
4514 }
4515 /* Add all stale LARVAL SAs into drainq */
4516 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
4517 if (now - sav->created < V_key_larval_lifetime)
4518 continue;
4519 SAV_ADDREF(sav);
4520 LIST_INSERT_HEAD(&drainq, sav, drainq);
4521 }
4522 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
4523 /* lifetimes aren't specified */
4524 if (sav->lft_h == NULL)
4525 continue;
4526 SECASVAR_RLOCK(sav);
4527 /*
4528 * Check again with lock held, because it may
4529 * be updated by SADB_UPDATE.
4530 */
4531 if (sav->lft_h == NULL) {
4532 SECASVAR_RUNLOCK(sav);
4533 continue;
4534 }
4535 /*
4536 * RFC 2367:
4537 * HARD lifetimes MUST take precedence over SOFT
4538 * lifetimes, meaning if the HARD and SOFT lifetimes
4539 * are the same, the HARD lifetime will appear on the
4540 * EXPIRE message.
4541 */
4542 /* check HARD lifetime */
4543 if ((sav->lft_h->addtime != 0 &&
4544 now - sav->created > sav->lft_h->addtime) ||
4545 (sav->lft_h->usetime != 0 && sav->firstused &&
4546 now - sav->firstused > sav->lft_h->usetime) ||
4547 (sav->lft_h->bytes != 0 && counter_u64_fetch(
4548 sav->lft_c_bytes) > sav->lft_h->bytes)) {
4549 SECASVAR_RUNLOCK(sav);
4550 SAV_ADDREF(sav);
4551 LIST_INSERT_HEAD(&hexpireq, sav, drainq);
4552 continue;
4553 }
4554 /* check SOFT lifetime (only for MATURE SAs) */
4555 if (sav->state == SADB_SASTATE_MATURE && (
4556 (sav->lft_s->addtime != 0 &&
4557 now - sav->created > sav->lft_s->addtime) ||
4558 (sav->lft_s->usetime != 0 && sav->firstused &&
4559 now - sav->firstused > sav->lft_s->usetime) ||
4560 (sav->lft_s->bytes != 0 && counter_u64_fetch(
4561 sav->lft_c_bytes) > sav->lft_s->bytes) ||
4562 (!(sav->flags & SADB_X_SAFLAGS_ESN) &&
4563 (sav->replay != NULL) && (
4564 (sav->replay->count > UINT32_80PCT) ||
4565 (sav->replay->last > UINT32_80PCT))))) {
4566 SECASVAR_RUNLOCK(sav);
4567 SAV_ADDREF(sav);
4568 LIST_INSERT_HEAD(&sexpireq, sav, drainq);
4569 continue;
4570 }
4571 SECASVAR_RUNLOCK(sav);
4572 }
4573 }
4574 SAHTREE_RUNLOCK();
4575
4576 if (LIST_EMPTY(&emptyq) && LIST_EMPTY(&drainq) &&
4577 LIST_EMPTY(&hexpireq) && LIST_EMPTY(&sexpireq))
4578 return;
4579
4580 LIST_INIT(&freeq);
4581 SAHTREE_WLOCK();
4582 /* Unlink stale LARVAL SAs */
4583 sav = LIST_FIRST(&drainq);
4584 while (sav != NULL) {
4585 nextsav = LIST_NEXT(sav, drainq);
4586 /* Check that SA is still LARVAL */
4587 if (sav->state != SADB_SASTATE_LARVAL) {
4588 LIST_REMOVE(sav, drainq);
4589 LIST_INSERT_HEAD(&freeq, sav, drainq);
4590 sav = nextsav;
4591 continue;
4592 }
4593 TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
4594 LIST_REMOVE(sav, spihash);
4595 sav->state = SADB_SASTATE_DEAD;
4596 sav = nextsav;
4597 }
4598 /* Unlink all SAs with expired HARD lifetime */
4599 sav = LIST_FIRST(&hexpireq);
4600 while (sav != NULL) {
4601 nextsav = LIST_NEXT(sav, drainq);
4602 /* Check that SA is not unlinked */
4603 if (sav->state == SADB_SASTATE_DEAD) {
4604 LIST_REMOVE(sav, drainq);
4605 LIST_INSERT_HEAD(&freeq, sav, drainq);
4606 sav = nextsav;
4607 continue;
4608 }
4609 TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
4610 LIST_REMOVE(sav, spihash);
4611 sav->state = SADB_SASTATE_DEAD;
4612 sav = nextsav;
4613 }
4614 /* Mark all SAs with expired SOFT lifetime as DYING */
4615 sav = LIST_FIRST(&sexpireq);
4616 while (sav != NULL) {
4617 nextsav = LIST_NEXT(sav, drainq);
4618 /* Check that SA is not unlinked */
4619 if (sav->state == SADB_SASTATE_DEAD) {
4620 LIST_REMOVE(sav, drainq);
4621 LIST_INSERT_HEAD(&freeq, sav, drainq);
4622 sav = nextsav;
4623 continue;
4624 }
4625 /*
4626 * NOTE: this doesn't change SA order in the chain.
4627 */
4628 sav->state = SADB_SASTATE_DYING;
4629 sav = nextsav;
4630 }
4631 /* Unlink empty SAHs */
4632 sah = LIST_FIRST(&emptyq);
4633 while (sah != NULL) {
4634 nextsah = LIST_NEXT(sah, drainq);
4635 /* Check that SAH is still empty and not unlinked */
4636 if (sah->state == SADB_SASTATE_DEAD ||
4637 !TAILQ_EMPTY(&sah->savtree_larval) ||
4638 !TAILQ_EMPTY(&sah->savtree_alive)) {
4639 LIST_REMOVE(sah, drainq);
4640 key_freesah(&sah); /* release extra reference */
4641 sah = nextsah;
4642 continue;
4643 }
4644 TAILQ_REMOVE(&V_sahtree, sah, chain);
4645 LIST_REMOVE(sah, addrhash);
4646 sah->state = SADB_SASTATE_DEAD;
4647 sah = nextsah;
4648 }
4649 SAHTREE_WUNLOCK();
4650
4651 /* Send SPDEXPIRE messages */
4652 sav = LIST_FIRST(&hexpireq);
4653 while (sav != NULL) {
4654 nextsav = LIST_NEXT(sav, drainq);
4655 key_expire(sav, 1);
4656 key_freesah(&sav->sah); /* release reference from SAV */
4657 key_freesav(&sav); /* release extra reference */
4658 key_freesav(&sav); /* release last reference */
4659 sav = nextsav;
4660 }
4661 sav = LIST_FIRST(&sexpireq);
4662 while (sav != NULL) {
4663 nextsav = LIST_NEXT(sav, drainq);
4664 key_expire(sav, 0);
4665 key_freesav(&sav); /* release extra reference */
4666 sav = nextsav;
4667 }
4668 /* Free stale LARVAL SAs */
4669 sav = LIST_FIRST(&drainq);
4670 while (sav != NULL) {
4671 nextsav = LIST_NEXT(sav, drainq);
4672 key_freesah(&sav->sah); /* release reference from SAV */
4673 key_freesav(&sav); /* release extra reference */
4674 key_freesav(&sav); /* release last reference */
4675 sav = nextsav;
4676 }
4677 /* Free SAs that were unlinked/changed by someone else */
4678 sav = LIST_FIRST(&freeq);
4679 while (sav != NULL) {
4680 nextsav = LIST_NEXT(sav, drainq);
4681 key_freesav(&sav); /* release extra reference */
4682 sav = nextsav;
4683 }
4684 /* Free empty SAH */
4685 sah = LIST_FIRST(&emptyq);
4686 while (sah != NULL) {
4687 nextsah = LIST_NEXT(sah, drainq);
4688 key_freesah(&sah); /* release extra reference */
4689 key_freesah(&sah); /* release last reference */
4690 sah = nextsah;
4691 }
4692 }
4693
4694 static void
key_flush_acq(time_t now)4695 key_flush_acq(time_t now)
4696 {
4697 struct secacq *acq, *nextacq;
4698
4699 /* ACQ tree */
4700 ACQ_LOCK();
4701 acq = LIST_FIRST(&V_acqtree);
4702 while (acq != NULL) {
4703 nextacq = LIST_NEXT(acq, chain);
4704 if (now - acq->created > V_key_blockacq_lifetime) {
4705 LIST_REMOVE(acq, chain);
4706 LIST_REMOVE(acq, addrhash);
4707 LIST_REMOVE(acq, seqhash);
4708 free(acq, M_IPSEC_SAQ);
4709 }
4710 acq = nextacq;
4711 }
4712 ACQ_UNLOCK();
4713 }
4714
4715 static void
key_flush_spacq(time_t now)4716 key_flush_spacq(time_t now)
4717 {
4718 struct secspacq *acq, *nextacq;
4719
4720 /* SP ACQ tree */
4721 SPACQ_LOCK();
4722 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) {
4723 nextacq = LIST_NEXT(acq, chain);
4724 if (now - acq->created > V_key_blockacq_lifetime
4725 && __LIST_CHAINED(acq)) {
4726 LIST_REMOVE(acq, chain);
4727 free(acq, M_IPSEC_SAQ);
4728 }
4729 }
4730 SPACQ_UNLOCK();
4731 }
4732
4733 /*
4734 * time handler.
4735 * scanning SPD and SAD to check status for each entries,
4736 * and do to remove or to expire.
4737 * XXX: year 2038 problem may remain.
4738 */
4739 static void
key_timehandler(void * arg)4740 key_timehandler(void *arg)
4741 {
4742 VNET_ITERATOR_DECL(vnet_iter);
4743 time_t now = time_second;
4744
4745 VNET_LIST_RLOCK_NOSLEEP();
4746 VNET_FOREACH(vnet_iter) {
4747 CURVNET_SET(vnet_iter);
4748 key_flush_spd(now);
4749 key_flush_sad(now);
4750 key_flush_acq(now);
4751 key_flush_spacq(now);
4752 CURVNET_RESTORE();
4753 }
4754 VNET_LIST_RUNLOCK_NOSLEEP();
4755
4756 #ifndef IPSEC_DEBUG2
4757 /* do exchange to tick time !! */
4758 callout_schedule(&key_timer, hz);
4759 #endif /* IPSEC_DEBUG2 */
4760 }
4761
4762 u_long
key_random(void)4763 key_random(void)
4764 {
4765 u_long value;
4766
4767 arc4random_buf(&value, sizeof(value));
4768 return value;
4769 }
4770
4771 /*
4772 * map SADB_SATYPE_* to IPPROTO_*.
4773 * if satype == SADB_SATYPE then satype is mapped to ~0.
4774 * OUT:
4775 * 0: invalid satype.
4776 */
4777 static uint8_t
key_satype2proto(uint8_t satype)4778 key_satype2proto(uint8_t satype)
4779 {
4780 switch (satype) {
4781 case SADB_SATYPE_UNSPEC:
4782 return IPSEC_PROTO_ANY;
4783 case SADB_SATYPE_AH:
4784 return IPPROTO_AH;
4785 case SADB_SATYPE_ESP:
4786 return IPPROTO_ESP;
4787 case SADB_X_SATYPE_IPCOMP:
4788 return IPPROTO_IPCOMP;
4789 case SADB_X_SATYPE_TCPSIGNATURE:
4790 return IPPROTO_TCP;
4791 default:
4792 return 0;
4793 }
4794 /* NOTREACHED */
4795 }
4796
4797 /*
4798 * map IPPROTO_* to SADB_SATYPE_*
4799 * OUT:
4800 * 0: invalid protocol type.
4801 */
4802 static uint8_t
key_proto2satype(uint8_t proto)4803 key_proto2satype(uint8_t proto)
4804 {
4805 switch (proto) {
4806 case IPPROTO_AH:
4807 return SADB_SATYPE_AH;
4808 case IPPROTO_ESP:
4809 return SADB_SATYPE_ESP;
4810 case IPPROTO_IPCOMP:
4811 return SADB_X_SATYPE_IPCOMP;
4812 case IPPROTO_TCP:
4813 return SADB_X_SATYPE_TCPSIGNATURE;
4814 default:
4815 return 0;
4816 }
4817 /* NOTREACHED */
4818 }
4819
4820 /* %%% PF_KEY */
4821 /*
4822 * SADB_GETSPI processing is to receive
4823 * <base, (SA2), src address, dst address, (SPI range)>
4824 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND
4825 * tree with the status of LARVAL, and send
4826 * <base, SA(*), address(SD)>
4827 * to the IKMPd.
4828 *
4829 * IN: mhp: pointer to the pointer to each header.
4830 * OUT: NULL if fail.
4831 * other if success, return pointer to the message to send.
4832 */
4833 static int
key_getspi(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)4834 key_getspi(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4835 {
4836 struct secasindex saidx;
4837 struct sadb_address *src0, *dst0;
4838 struct secasvar *sav;
4839 uint32_t reqid, spi;
4840 int error;
4841 uint8_t mode, proto;
4842
4843 IPSEC_ASSERT(so != NULL, ("null socket"));
4844 IPSEC_ASSERT(m != NULL, ("null mbuf"));
4845 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
4846 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
4847
4848 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
4849 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST)
4850 #ifdef PFKEY_STRICT_CHECKS
4851 || SADB_CHECKHDR(mhp, SADB_EXT_SPIRANGE)
4852 #endif
4853 ) {
4854 ipseclog((LOG_DEBUG,
4855 "%s: invalid message: missing required header.\n",
4856 __func__));
4857 error = EINVAL;
4858 goto fail;
4859 }
4860 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
4861 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)
4862 #ifdef PFKEY_STRICT_CHECKS
4863 || SADB_CHECKLEN(mhp, SADB_EXT_SPIRANGE)
4864 #endif
4865 ) {
4866 ipseclog((LOG_DEBUG,
4867 "%s: invalid message: wrong header size.\n", __func__));
4868 error = EINVAL;
4869 goto fail;
4870 }
4871 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
4872 mode = IPSEC_MODE_ANY;
4873 reqid = 0;
4874 } else {
4875 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
4876 ipseclog((LOG_DEBUG,
4877 "%s: invalid message: wrong header size.\n",
4878 __func__));
4879 error = EINVAL;
4880 goto fail;
4881 }
4882 mode = ((struct sadb_x_sa2 *)
4883 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4884 reqid = ((struct sadb_x_sa2 *)
4885 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4886 }
4887
4888 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4889 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4890
4891 /* map satype to proto */
4892 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4893 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
4894 __func__));
4895 error = EINVAL;
4896 goto fail;
4897 }
4898 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
4899 (struct sockaddr *)(dst0 + 1));
4900 if (error != 0) {
4901 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
4902 error = EINVAL;
4903 goto fail;
4904 }
4905 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4906
4907 /* SPI allocation */
4908 spi = key_do_getnewspi(
4909 (struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], &saidx);
4910 if (spi == 0) {
4911 /*
4912 * Requested SPI or SPI range is not available or
4913 * already used.
4914 */
4915 error = EEXIST;
4916 goto fail;
4917 }
4918 sav = key_newsav(mhp, &saidx, spi, &error);
4919 if (sav == NULL)
4920 goto fail;
4921
4922 if (sav->seq != 0) {
4923 /*
4924 * RFC2367:
4925 * If the SADB_GETSPI message is in response to a
4926 * kernel-generated SADB_ACQUIRE, the sadb_msg_seq
4927 * MUST be the same as the SADB_ACQUIRE message.
4928 *
4929 * XXXAE: However it doesn't definethe behaviour how to
4930 * check this and what to do if it doesn't match.
4931 * Also what we should do if it matches?
4932 *
4933 * We can compare saidx used in SADB_ACQUIRE with saidx
4934 * used in SADB_GETSPI, but this probably can break
4935 * existing software. For now just warn if it doesn't match.
4936 *
4937 * XXXAE: anyway it looks useless.
4938 */
4939 key_acqdone(&saidx, sav->seq);
4940 }
4941 KEYDBG(KEY_STAMP,
4942 printf("%s: SA(%p)\n", __func__, sav));
4943 KEYDBG(KEY_DATA, kdebug_secasv(sav));
4944
4945 {
4946 struct mbuf *n, *nn;
4947 struct sadb_sa *m_sa;
4948 struct sadb_msg *newmsg;
4949 int off, len;
4950
4951 /* create new sadb_msg to reply. */
4952 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) +
4953 PFKEY_ALIGN8(sizeof(struct sadb_sa));
4954
4955 n = key_mget(len);
4956 if (n == NULL) {
4957 error = ENOBUFS;
4958 goto fail;
4959 }
4960
4961 n->m_len = len;
4962 n->m_next = NULL;
4963 off = 0;
4964
4965 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
4966 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
4967
4968 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off);
4969 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa));
4970 m_sa->sadb_sa_exttype = SADB_EXT_SA;
4971 m_sa->sadb_sa_spi = spi; /* SPI is already in network byte order */
4972 off += PFKEY_ALIGN8(sizeof(struct sadb_sa));
4973
4974 IPSEC_ASSERT(off == len,
4975 ("length inconsistency (off %u len %u)", off, len));
4976
4977 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC,
4978 SADB_EXT_ADDRESS_DST);
4979 if (!n->m_next) {
4980 m_freem(n);
4981 error = ENOBUFS;
4982 goto fail;
4983 }
4984
4985 if (n->m_len < sizeof(struct sadb_msg)) {
4986 n = m_pullup(n, sizeof(struct sadb_msg));
4987 if (n == NULL)
4988 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
4989 }
4990
4991 n->m_pkthdr.len = 0;
4992 for (nn = n; nn; nn = nn->m_next)
4993 n->m_pkthdr.len += nn->m_len;
4994
4995 newmsg = mtod(n, struct sadb_msg *);
4996 newmsg->sadb_msg_seq = sav->seq;
4997 newmsg->sadb_msg_errno = 0;
4998 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
4999
5000 m_freem(m);
5001 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
5002 }
5003
5004 fail:
5005 return (key_senderror(so, m, error));
5006 }
5007
5008 /*
5009 * allocating new SPI
5010 * called by key_getspi().
5011 * OUT:
5012 * 0: failure.
5013 * others: success, SPI in network byte order.
5014 */
5015 static uint32_t
key_do_getnewspi(struct sadb_spirange * spirange,struct secasindex * saidx)5016 key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx)
5017 {
5018 uint32_t min, max, newspi, t;
5019 int count = V_key_spi_trycnt;
5020
5021 /* set spi range to allocate */
5022 if (spirange != NULL) {
5023 min = spirange->sadb_spirange_min;
5024 max = spirange->sadb_spirange_max;
5025 } else {
5026 min = V_key_spi_minval;
5027 max = V_key_spi_maxval;
5028 }
5029 /* IPCOMP needs 2-byte SPI */
5030 if (saidx->proto == IPPROTO_IPCOMP) {
5031 if (min >= 0x10000)
5032 min = 0xffff;
5033 if (max >= 0x10000)
5034 max = 0xffff;
5035 if (min > max) {
5036 t = min; min = max; max = t;
5037 }
5038 }
5039
5040 if (min == max) {
5041 if (key_checkspidup(htonl(min))) {
5042 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n",
5043 __func__, min));
5044 return 0;
5045 }
5046
5047 count--; /* taking one cost. */
5048 newspi = min;
5049 } else {
5050 /* init SPI */
5051 newspi = 0;
5052
5053 /* when requesting to allocate spi ranged */
5054 while (count--) {
5055 /* generate pseudo-random SPI value ranged. */
5056 newspi = min + (key_random() % (max - min + 1));
5057 if (!key_checkspidup(htonl(newspi)))
5058 break;
5059 }
5060
5061 if (count == 0 || newspi == 0) {
5062 ipseclog((LOG_DEBUG,
5063 "%s: failed to allocate SPI.\n", __func__));
5064 return 0;
5065 }
5066 }
5067
5068 /* statistics */
5069 keystat.getspi_count =
5070 (keystat.getspi_count + V_key_spi_trycnt - count) / 2;
5071
5072 return (htonl(newspi));
5073 }
5074
5075 /*
5076 * Find TCP-MD5 SA with corresponding secasindex.
5077 * If not found, return NULL and fill SPI with usable value if needed.
5078 */
5079 static struct secasvar *
key_getsav_tcpmd5(struct secasindex * saidx,uint32_t * spi)5080 key_getsav_tcpmd5(struct secasindex *saidx, uint32_t *spi)
5081 {
5082 SAHTREE_RLOCK_TRACKER;
5083 struct secashead *sah;
5084 struct secasvar *sav;
5085
5086 IPSEC_ASSERT(saidx->proto == IPPROTO_TCP, ("wrong proto"));
5087 SAHTREE_RLOCK();
5088 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
5089 if (sah->saidx.proto != IPPROTO_TCP)
5090 continue;
5091 if (!key_sockaddrcmp(&saidx->dst.sa, &sah->saidx.dst.sa, 0) &&
5092 !key_sockaddrcmp(&saidx->src.sa, &sah->saidx.src.sa, 0))
5093 break;
5094 }
5095 if (sah != NULL) {
5096 if (V_key_preferred_oldsa)
5097 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
5098 else
5099 sav = TAILQ_FIRST(&sah->savtree_alive);
5100 if (sav != NULL) {
5101 SAV_ADDREF(sav);
5102 SAHTREE_RUNLOCK();
5103 return (sav);
5104 }
5105 }
5106 if (spi == NULL) {
5107 /* No SPI required */
5108 SAHTREE_RUNLOCK();
5109 return (NULL);
5110 }
5111 /* Check that SPI is unique */
5112 LIST_FOREACH(sav, SAVHASH_HASH(*spi), spihash) {
5113 if (sav->spi == *spi)
5114 break;
5115 }
5116 if (sav == NULL) {
5117 SAHTREE_RUNLOCK();
5118 /* SPI is already unique */
5119 return (NULL);
5120 }
5121 SAHTREE_RUNLOCK();
5122 /* XXX: not optimal */
5123 *spi = key_do_getnewspi(NULL, saidx);
5124 return (NULL);
5125 }
5126
5127 static int
key_updateaddresses(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp,struct secasvar * sav,struct secasindex * saidx)5128 key_updateaddresses(struct socket *so, struct mbuf *m,
5129 const struct sadb_msghdr *mhp, struct secasvar *sav,
5130 struct secasindex *saidx)
5131 {
5132 struct sockaddr *newaddr;
5133 struct secashead *sah;
5134 struct secasvar *newsav, *tmp;
5135 struct mbuf *n;
5136 int error, isnew;
5137
5138 /* Check that we need to change SAH */
5139 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC)) {
5140 newaddr = (struct sockaddr *)(
5141 ((struct sadb_address *)
5142 mhp->ext[SADB_X_EXT_NEW_ADDRESS_SRC]) + 1);
5143 bcopy(newaddr, &saidx->src, newaddr->sa_len);
5144 key_porttosaddr(&saidx->src.sa, 0);
5145 }
5146 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST)) {
5147 newaddr = (struct sockaddr *)(
5148 ((struct sadb_address *)
5149 mhp->ext[SADB_X_EXT_NEW_ADDRESS_DST]) + 1);
5150 bcopy(newaddr, &saidx->dst, newaddr->sa_len);
5151 key_porttosaddr(&saidx->dst.sa, 0);
5152 }
5153 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC) ||
5154 !SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST)) {
5155 error = key_checksockaddrs(&saidx->src.sa, &saidx->dst.sa);
5156 if (error != 0) {
5157 ipseclog((LOG_DEBUG, "%s: invalid new sockaddr.\n",
5158 __func__));
5159 return (error);
5160 }
5161
5162 sah = key_getsah(saidx);
5163 if (sah == NULL) {
5164 /* create a new SA index */
5165 sah = key_newsah(saidx);
5166 if (sah == NULL) {
5167 ipseclog((LOG_DEBUG,
5168 "%s: No more memory.\n", __func__));
5169 return (ENOBUFS);
5170 }
5171 isnew = 2; /* SAH is new */
5172 } else
5173 isnew = 1; /* existing SAH is referenced */
5174 } else {
5175 /*
5176 * src and dst addresses are still the same.
5177 * Do we want to change NAT-T config?
5178 */
5179 if (sav->sah->saidx.proto != IPPROTO_ESP ||
5180 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5181 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_SPORT) ||
5182 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5183 ipseclog((LOG_DEBUG,
5184 "%s: invalid message: missing required header.\n",
5185 __func__));
5186 return (EINVAL);
5187 }
5188 /* We hold reference to SA, thus SAH will be referenced too. */
5189 sah = sav->sah;
5190 isnew = 0;
5191 }
5192
5193 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA,
5194 M_NOWAIT | M_ZERO);
5195 if (newsav == NULL) {
5196 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5197 error = ENOBUFS;
5198 goto fail;
5199 }
5200
5201 /* Clone SA's content into newsav */
5202 SAV_INITREF(newsav);
5203 bcopy(sav, newsav, offsetof(struct secasvar, chain));
5204 /*
5205 * We create new NAT-T config if it is needed.
5206 * Old NAT-T config will be freed by key_cleansav() when
5207 * last reference to SA will be released.
5208 */
5209 newsav->natt = NULL;
5210 newsav->sah = sah;
5211 newsav->state = SADB_SASTATE_MATURE;
5212 error = key_setnatt(newsav, mhp);
5213 if (error != 0)
5214 goto fail;
5215
5216 SAHTREE_WLOCK();
5217 /* Check that SA is still alive */
5218 if (sav->state == SADB_SASTATE_DEAD) {
5219 /* SA was unlinked */
5220 SAHTREE_WUNLOCK();
5221 error = ESRCH;
5222 goto fail;
5223 }
5224
5225 /* Unlink SA from SAH and SPI hash */
5226 IPSEC_ASSERT((sav->flags & SADB_X_EXT_F_CLONED) == 0,
5227 ("SA is already cloned"));
5228 IPSEC_ASSERT(sav->state == SADB_SASTATE_MATURE ||
5229 sav->state == SADB_SASTATE_DYING,
5230 ("Wrong SA state %u\n", sav->state));
5231 TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
5232 LIST_REMOVE(sav, spihash);
5233 sav->state = SADB_SASTATE_DEAD;
5234
5235 /*
5236 * Link new SA with SAH. Keep SAs ordered by
5237 * create time (newer are first).
5238 */
5239 TAILQ_FOREACH(tmp, &sah->savtree_alive, chain) {
5240 if (newsav->created > tmp->created) {
5241 TAILQ_INSERT_BEFORE(tmp, newsav, chain);
5242 break;
5243 }
5244 }
5245 if (tmp == NULL)
5246 TAILQ_INSERT_TAIL(&sah->savtree_alive, newsav, chain);
5247
5248 /* Add new SA into SPI hash. */
5249 LIST_INSERT_HEAD(SAVHASH_HASH(newsav->spi), newsav, spihash);
5250
5251 /* Add new SAH into SADB. */
5252 if (isnew == 2) {
5253 TAILQ_INSERT_HEAD(&V_sahtree, sah, chain);
5254 LIST_INSERT_HEAD(SAHADDRHASH_HASH(saidx), sah, addrhash);
5255 sah->state = SADB_SASTATE_MATURE;
5256 SAH_ADDREF(sah); /* newsav references new SAH */
5257 }
5258 /*
5259 * isnew == 1 -> @sah was referenced by key_getsah().
5260 * isnew == 0 -> we use the same @sah, that was used by @sav,
5261 * and we use its reference for @newsav.
5262 */
5263 SECASVAR_WLOCK(sav);
5264 /* XXX: replace cntr with pointer? */
5265 newsav->cntr = sav->cntr;
5266 sav->flags |= SADB_X_EXT_F_CLONED;
5267 SECASVAR_WUNLOCK(sav);
5268
5269 SAHTREE_WUNLOCK();
5270
5271 KEYDBG(KEY_STAMP,
5272 printf("%s: SA(%p) cloned into SA(%p)\n",
5273 __func__, sav, newsav));
5274 KEYDBG(KEY_DATA, kdebug_secasv(newsav));
5275
5276 key_freesav(&sav); /* release last reference */
5277
5278 /* set msg buf from mhp */
5279 n = key_getmsgbuf_x1(m, mhp);
5280 if (n == NULL) {
5281 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5282 return (ENOBUFS);
5283 }
5284 m_freem(m);
5285 key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5286 return (0);
5287 fail:
5288 if (isnew != 0)
5289 key_freesah(&sah);
5290 if (newsav != NULL) {
5291 if (newsav->natt != NULL)
5292 free(newsav->natt, M_IPSEC_MISC);
5293 free(newsav, M_IPSEC_SA);
5294 }
5295 return (error);
5296 }
5297
5298 /*
5299 * SADB_UPDATE processing
5300 * receive
5301 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5302 * key(AE), (identity(SD),) (sensitivity)>
5303 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL.
5304 * and send
5305 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5306 * (identity(SD),) (sensitivity)>
5307 * to the ikmpd.
5308 *
5309 * m will always be freed.
5310 */
5311 static int
key_update(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)5312 key_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5313 {
5314 struct secasindex saidx;
5315 struct sadb_address *src0, *dst0;
5316 struct sadb_sa *sa0;
5317 struct secasvar *sav;
5318 uint32_t reqid;
5319 int error;
5320 uint8_t mode, proto;
5321
5322 IPSEC_ASSERT(so != NULL, ("null socket"));
5323 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5324 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5325 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5326
5327 /* map satype to proto */
5328 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5329 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5330 __func__));
5331 return key_senderror(so, m, EINVAL);
5332 }
5333
5334 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
5335 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
5336 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
5337 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
5338 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
5339 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
5340 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
5341 ipseclog((LOG_DEBUG,
5342 "%s: invalid message: missing required header.\n",
5343 __func__));
5344 return key_senderror(so, m, EINVAL);
5345 }
5346 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
5347 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
5348 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
5349 ipseclog((LOG_DEBUG,
5350 "%s: invalid message: wrong header size.\n", __func__));
5351 return key_senderror(so, m, EINVAL);
5352 }
5353 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
5354 mode = IPSEC_MODE_ANY;
5355 reqid = 0;
5356 } else {
5357 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
5358 ipseclog((LOG_DEBUG,
5359 "%s: invalid message: wrong header size.\n",
5360 __func__));
5361 return key_senderror(so, m, EINVAL);
5362 }
5363 mode = ((struct sadb_x_sa2 *)
5364 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
5365 reqid = ((struct sadb_x_sa2 *)
5366 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
5367 }
5368
5369 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5370 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
5371 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
5372
5373 /*
5374 * Only SADB_SASTATE_MATURE SAs may be submitted in an
5375 * SADB_UPDATE message.
5376 */
5377 if (sa0->sadb_sa_state != SADB_SASTATE_MATURE) {
5378 ipseclog((LOG_DEBUG, "%s: invalid state.\n", __func__));
5379 #ifdef PFKEY_STRICT_CHECKS
5380 return key_senderror(so, m, EINVAL);
5381 #endif
5382 }
5383 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
5384 (struct sockaddr *)(dst0 + 1));
5385 if (error != 0) {
5386 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
5387 return key_senderror(so, m, error);
5388 }
5389 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
5390 sav = key_getsavbyspi(sa0->sadb_sa_spi);
5391 if (sav == NULL) {
5392 ipseclog((LOG_DEBUG, "%s: no SA found for SPI %u\n",
5393 __func__, ntohl(sa0->sadb_sa_spi)));
5394 return key_senderror(so, m, EINVAL);
5395 }
5396 /*
5397 * Check that SADB_UPDATE issued by the same process that did
5398 * SADB_GETSPI or SADB_ADD.
5399 */
5400 if (sav->pid != mhp->msg->sadb_msg_pid) {
5401 ipseclog((LOG_DEBUG,
5402 "%s: pid mismatched (SPI %u, pid %u vs. %u)\n", __func__,
5403 ntohl(sav->spi), sav->pid, mhp->msg->sadb_msg_pid));
5404 key_freesav(&sav);
5405 return key_senderror(so, m, EINVAL);
5406 }
5407 /* saidx should match with SA. */
5408 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_MODE_REQID) == 0) {
5409 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u\n",
5410 __func__, ntohl(sav->spi)));
5411 key_freesav(&sav);
5412 return key_senderror(so, m, ESRCH);
5413 }
5414
5415 if (sav->state == SADB_SASTATE_LARVAL) {
5416 if ((mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
5417 SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT)) ||
5418 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
5419 SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH))) {
5420 ipseclog((LOG_DEBUG,
5421 "%s: invalid message: missing required header.\n",
5422 __func__));
5423 key_freesav(&sav);
5424 return key_senderror(so, m, EINVAL);
5425 }
5426 /*
5427 * We can set any values except src, dst and SPI.
5428 */
5429 error = key_setsaval(sav, mhp);
5430 if (error != 0) {
5431 key_freesav(&sav);
5432 return (key_senderror(so, m, error));
5433 }
5434 /* Change SA state to MATURE */
5435 SAHTREE_WLOCK();
5436 if (sav->state != SADB_SASTATE_LARVAL) {
5437 /* SA was deleted or another thread made it MATURE. */
5438 SAHTREE_WUNLOCK();
5439 key_freesav(&sav);
5440 return (key_senderror(so, m, ESRCH));
5441 }
5442 /*
5443 * NOTE: we keep SAs in savtree_alive ordered by created
5444 * time. When SA's state changed from LARVAL to MATURE,
5445 * we update its created time in key_setsaval() and move
5446 * it into head of savtree_alive.
5447 */
5448 TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
5449 TAILQ_INSERT_HEAD(&sav->sah->savtree_alive, sav, chain);
5450 sav->state = SADB_SASTATE_MATURE;
5451 SAHTREE_WUNLOCK();
5452 } else {
5453 /*
5454 * For DYING and MATURE SA we can change only state
5455 * and lifetimes. Report EINVAL if something else attempted
5456 * to change.
5457 */
5458 if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT) ||
5459 !SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH)) {
5460 key_freesav(&sav);
5461 return (key_senderror(so, m, EINVAL));
5462 }
5463 error = key_updatelifetimes(sav, mhp);
5464 if (error != 0) {
5465 key_freesav(&sav);
5466 return (key_senderror(so, m, error));
5467 }
5468 /*
5469 * This is FreeBSD extension to RFC2367.
5470 * IKEd can specify SADB_X_EXT_NEW_ADDRESS_SRC and/or
5471 * SADB_X_EXT_NEW_ADDRESS_DST when it wants to change
5472 * SA addresses (for example to implement MOBIKE protocol
5473 * as described in RFC4555). Also we allow to change
5474 * NAT-T config.
5475 */
5476 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC) ||
5477 !SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST) ||
5478 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5479 sav->natt != NULL) {
5480 error = key_updateaddresses(so, m, mhp, sav, &saidx);
5481 key_freesav(&sav);
5482 if (error != 0)
5483 return (key_senderror(so, m, error));
5484 return (0);
5485 }
5486 /* Check that SA is still alive */
5487 SAHTREE_WLOCK();
5488 if (sav->state == SADB_SASTATE_DEAD) {
5489 /* SA was unlinked */
5490 SAHTREE_WUNLOCK();
5491 key_freesav(&sav);
5492 return (key_senderror(so, m, ESRCH));
5493 }
5494 /*
5495 * NOTE: there is possible state moving from DYING to MATURE,
5496 * but this doesn't change created time, so we won't reorder
5497 * this SA.
5498 */
5499 sav->state = SADB_SASTATE_MATURE;
5500 SAHTREE_WUNLOCK();
5501 }
5502 KEYDBG(KEY_STAMP,
5503 printf("%s: SA(%p)\n", __func__, sav));
5504 KEYDBG(KEY_DATA, kdebug_secasv(sav));
5505 key_freesav(&sav);
5506
5507 {
5508 struct mbuf *n;
5509
5510 /* set msg buf from mhp */
5511 n = key_getmsgbuf_x1(m, mhp);
5512 if (n == NULL) {
5513 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5514 return key_senderror(so, m, ENOBUFS);
5515 }
5516
5517 m_freem(m);
5518 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5519 }
5520 }
5521
5522 /*
5523 * SADB_ADD processing
5524 * add an entry to SA database, when received
5525 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5526 * key(AE), (identity(SD),) (sensitivity)>
5527 * from the ikmpd,
5528 * and send
5529 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5530 * (identity(SD),) (sensitivity)>
5531 * to the ikmpd.
5532 *
5533 * IGNORE identity and sensitivity messages.
5534 *
5535 * m will always be freed.
5536 */
5537 static int
key_add(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)5538 key_add(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5539 {
5540 struct secasindex saidx;
5541 struct sadb_address *src0, *dst0;
5542 struct sadb_sa *sa0;
5543 struct secasvar *sav;
5544 uint32_t reqid, spi;
5545 uint8_t mode, proto;
5546 int error;
5547
5548 IPSEC_ASSERT(so != NULL, ("null socket"));
5549 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5550 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5551 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5552
5553 /* map satype to proto */
5554 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5555 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5556 __func__));
5557 return key_senderror(so, m, EINVAL);
5558 }
5559
5560 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
5561 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
5562 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
5563 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && (
5564 SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT) ||
5565 SADB_CHECKLEN(mhp, SADB_EXT_KEY_ENCRYPT))) ||
5566 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && (
5567 SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH) ||
5568 SADB_CHECKLEN(mhp, SADB_EXT_KEY_AUTH))) ||
5569 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
5570 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
5571 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
5572 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
5573 ipseclog((LOG_DEBUG,
5574 "%s: invalid message: missing required header.\n",
5575 __func__));
5576 return key_senderror(so, m, EINVAL);
5577 }
5578 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
5579 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
5580 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
5581 ipseclog((LOG_DEBUG,
5582 "%s: invalid message: wrong header size.\n", __func__));
5583 return key_senderror(so, m, EINVAL);
5584 }
5585 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
5586 mode = IPSEC_MODE_ANY;
5587 reqid = 0;
5588 } else {
5589 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
5590 ipseclog((LOG_DEBUG,
5591 "%s: invalid message: wrong header size.\n",
5592 __func__));
5593 return key_senderror(so, m, EINVAL);
5594 }
5595 mode = ((struct sadb_x_sa2 *)
5596 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
5597 reqid = ((struct sadb_x_sa2 *)
5598 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
5599 }
5600
5601 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5602 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
5603 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
5604
5605 /*
5606 * Only SADB_SASTATE_MATURE SAs may be submitted in an
5607 * SADB_ADD message.
5608 */
5609 if (sa0->sadb_sa_state != SADB_SASTATE_MATURE) {
5610 ipseclog((LOG_DEBUG, "%s: invalid state.\n", __func__));
5611 #ifdef PFKEY_STRICT_CHECKS
5612 return key_senderror(so, m, EINVAL);
5613 #endif
5614 }
5615 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
5616 (struct sockaddr *)(dst0 + 1));
5617 if (error != 0) {
5618 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
5619 return key_senderror(so, m, error);
5620 }
5621 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
5622 spi = sa0->sadb_sa_spi;
5623 /*
5624 * For TCP-MD5 SAs we don't use SPI. Check the uniqueness using
5625 * secasindex.
5626 * XXXAE: IPComp seems also doesn't use SPI.
5627 */
5628 if (proto == IPPROTO_TCP) {
5629 sav = key_getsav_tcpmd5(&saidx, &spi);
5630 if (sav == NULL && spi == 0) {
5631 /* Failed to allocate SPI */
5632 ipseclog((LOG_DEBUG, "%s: SA already exists.\n",
5633 __func__));
5634 return key_senderror(so, m, EEXIST);
5635 }
5636 /* XXX: SPI that we report back can have another value */
5637 } else {
5638 /* We can create new SA only if SPI is different. */
5639 sav = key_getsavbyspi(spi);
5640 }
5641 if (sav != NULL) {
5642 key_freesav(&sav);
5643 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__));
5644 return key_senderror(so, m, EEXIST);
5645 }
5646
5647 sav = key_newsav(mhp, &saidx, spi, &error);
5648 if (sav == NULL)
5649 return key_senderror(so, m, error);
5650 KEYDBG(KEY_STAMP,
5651 printf("%s: return SA(%p)\n", __func__, sav));
5652 KEYDBG(KEY_DATA, kdebug_secasv(sav));
5653 /*
5654 * If SADB_ADD was in response to SADB_ACQUIRE, we need to schedule
5655 * ACQ for deletion.
5656 */
5657 if (sav->seq != 0)
5658 key_acqdone(&saidx, sav->seq);
5659
5660 {
5661 /*
5662 * Don't call key_freesav() on error here, as we would like to
5663 * keep the SA in the database.
5664 */
5665 struct mbuf *n;
5666
5667 /* set msg buf from mhp */
5668 n = key_getmsgbuf_x1(m, mhp);
5669 if (n == NULL) {
5670 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5671 return key_senderror(so, m, ENOBUFS);
5672 }
5673
5674 m_freem(m);
5675 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5676 }
5677 }
5678
5679 /*
5680 * NAT-T support.
5681 * IKEd may request the use ESP in UDP encapsulation when it detects the
5682 * presence of NAT. It uses NAT-T extension headers for such SAs to specify
5683 * parameters needed for encapsulation and decapsulation. These PF_KEY
5684 * extension headers are not standardized, so this comment addresses our
5685 * implementation.
5686 * SADB_X_EXT_NAT_T_TYPE specifies type of encapsulation, we support only
5687 * UDP_ENCAP_ESPINUDP as described in RFC3948.
5688 * SADB_X_EXT_NAT_T_SPORT/DPORT specifies source and destination ports for
5689 * UDP header. We use these ports in UDP encapsulation procedure, also we
5690 * can check them in UDP decapsulation procedure.
5691 * SADB_X_EXT_NAT_T_OA[IR] specifies original address of initiator or
5692 * responder. These addresses can be used for transport mode to adjust
5693 * checksum after decapsulation and decryption. Since original IP addresses
5694 * used by peer usually different (we detected presence of NAT), TCP/UDP
5695 * pseudo header checksum and IP header checksum was calculated using original
5696 * addresses. After decapsulation and decryption we need to adjust checksum
5697 * to have correct datagram.
5698 *
5699 * We expect presence of NAT-T extension headers only in SADB_ADD and
5700 * SADB_UPDATE messages. We report NAT-T extension headers in replies
5701 * to SADB_ADD, SADB_UPDATE, SADB_GET, and SADB_DUMP messages.
5702 */
5703 static int
key_setnatt(struct secasvar * sav,const struct sadb_msghdr * mhp)5704 key_setnatt(struct secasvar *sav, const struct sadb_msghdr *mhp)
5705 {
5706 struct sadb_x_nat_t_port *port;
5707 struct sadb_x_nat_t_type *type;
5708 struct sadb_address *oai, *oar;
5709 struct sockaddr *sa;
5710 uint32_t addr;
5711 uint16_t cksum;
5712
5713 IPSEC_ASSERT(sav->natt == NULL, ("natt is already initialized"));
5714 /*
5715 * Ignore NAT-T headers if sproto isn't ESP.
5716 */
5717 if (sav->sah->saidx.proto != IPPROTO_ESP)
5718 return (0);
5719
5720 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) &&
5721 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_SPORT) &&
5722 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5723 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5724 SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_SPORT) ||
5725 SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5726 ipseclog((LOG_DEBUG,
5727 "%s: invalid message: wrong header size.\n",
5728 __func__));
5729 return (EINVAL);
5730 }
5731 } else
5732 return (0);
5733
5734 type = (struct sadb_x_nat_t_type *)mhp->ext[SADB_X_EXT_NAT_T_TYPE];
5735 if (type->sadb_x_nat_t_type_type != UDP_ENCAP_ESPINUDP) {
5736 ipseclog((LOG_DEBUG, "%s: unsupported NAT-T type %u.\n",
5737 __func__, type->sadb_x_nat_t_type_type));
5738 return (EINVAL);
5739 }
5740 /*
5741 * Allocate storage for NAT-T config.
5742 * On error it will be released by key_cleansav().
5743 */
5744 sav->natt = malloc(sizeof(struct secnatt), M_IPSEC_MISC,
5745 M_NOWAIT | M_ZERO);
5746 if (sav->natt == NULL) {
5747 PFKEYSTAT_INC(in_nomem);
5748 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5749 return (ENOBUFS);
5750 }
5751 port = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_SPORT];
5752 if (port->sadb_x_nat_t_port_port == 0) {
5753 ipseclog((LOG_DEBUG, "%s: invalid NAT-T sport specified.\n",
5754 __func__));
5755 return (EINVAL);
5756 }
5757 sav->natt->sport = port->sadb_x_nat_t_port_port;
5758 port = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_DPORT];
5759 if (port->sadb_x_nat_t_port_port == 0) {
5760 ipseclog((LOG_DEBUG, "%s: invalid NAT-T dport specified.\n",
5761 __func__));
5762 return (EINVAL);
5763 }
5764 sav->natt->dport = port->sadb_x_nat_t_port_port;
5765
5766 /*
5767 * SADB_X_EXT_NAT_T_OAI and SADB_X_EXT_NAT_T_OAR are optional
5768 * and needed only for transport mode IPsec.
5769 * Usually NAT translates only one address, but it is possible,
5770 * that both addresses could be translated.
5771 * NOTE: Value of SADB_X_EXT_NAT_T_OAI is equal to SADB_X_EXT_NAT_T_OA.
5772 */
5773 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_OAI)) {
5774 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_OAI)) {
5775 ipseclog((LOG_DEBUG,
5776 "%s: invalid message: wrong header size.\n",
5777 __func__));
5778 return (EINVAL);
5779 }
5780 oai = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI];
5781 } else
5782 oai = NULL;
5783 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_OAR)) {
5784 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_OAR)) {
5785 ipseclog((LOG_DEBUG,
5786 "%s: invalid message: wrong header size.\n",
5787 __func__));
5788 return (EINVAL);
5789 }
5790 oar = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR];
5791 } else
5792 oar = NULL;
5793
5794 /* Initialize addresses only for transport mode */
5795 if (sav->sah->saidx.mode != IPSEC_MODE_TUNNEL) {
5796 cksum = 0;
5797 if (oai != NULL) {
5798 /* Currently we support only AF_INET */
5799 sa = (struct sockaddr *)(oai + 1);
5800 if (sa->sa_family != AF_INET ||
5801 sa->sa_len != sizeof(struct sockaddr_in)) {
5802 ipseclog((LOG_DEBUG,
5803 "%s: wrong NAT-OAi header.\n",
5804 __func__));
5805 return (EINVAL);
5806 }
5807 /* Ignore address if it the same */
5808 if (((struct sockaddr_in *)sa)->sin_addr.s_addr !=
5809 sav->sah->saidx.src.sin.sin_addr.s_addr) {
5810 bcopy(sa, &sav->natt->oai.sa, sa->sa_len);
5811 sav->natt->flags |= IPSEC_NATT_F_OAI;
5812 /* Calculate checksum delta */
5813 addr = sav->sah->saidx.src.sin.sin_addr.s_addr;
5814 cksum = in_addword(cksum, ~addr >> 16);
5815 cksum = in_addword(cksum, ~addr & 0xffff);
5816 addr = sav->natt->oai.sin.sin_addr.s_addr;
5817 cksum = in_addword(cksum, addr >> 16);
5818 cksum = in_addword(cksum, addr & 0xffff);
5819 }
5820 }
5821 if (oar != NULL) {
5822 /* Currently we support only AF_INET */
5823 sa = (struct sockaddr *)(oar + 1);
5824 if (sa->sa_family != AF_INET ||
5825 sa->sa_len != sizeof(struct sockaddr_in)) {
5826 ipseclog((LOG_DEBUG,
5827 "%s: wrong NAT-OAr header.\n",
5828 __func__));
5829 return (EINVAL);
5830 }
5831 /* Ignore address if it the same */
5832 if (((struct sockaddr_in *)sa)->sin_addr.s_addr !=
5833 sav->sah->saidx.dst.sin.sin_addr.s_addr) {
5834 bcopy(sa, &sav->natt->oar.sa, sa->sa_len);
5835 sav->natt->flags |= IPSEC_NATT_F_OAR;
5836 /* Calculate checksum delta */
5837 addr = sav->sah->saidx.dst.sin.sin_addr.s_addr;
5838 cksum = in_addword(cksum, ~addr >> 16);
5839 cksum = in_addword(cksum, ~addr & 0xffff);
5840 addr = sav->natt->oar.sin.sin_addr.s_addr;
5841 cksum = in_addword(cksum, addr >> 16);
5842 cksum = in_addword(cksum, addr & 0xffff);
5843 }
5844 }
5845 sav->natt->cksum = cksum;
5846 }
5847 return (0);
5848 }
5849
5850 static int
key_setident(struct secashead * sah,const struct sadb_msghdr * mhp)5851 key_setident(struct secashead *sah, const struct sadb_msghdr *mhp)
5852 {
5853 const struct sadb_ident *idsrc, *iddst;
5854
5855 IPSEC_ASSERT(sah != NULL, ("null secashead"));
5856 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5857 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5858
5859 /* don't make buffer if not there */
5860 if (SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_SRC) &&
5861 SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_DST)) {
5862 sah->idents = NULL;
5863 sah->identd = NULL;
5864 return (0);
5865 }
5866
5867 if (SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_SRC) ||
5868 SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_DST)) {
5869 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__));
5870 return (EINVAL);
5871 }
5872
5873 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC];
5874 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST];
5875
5876 /* validity check */
5877 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) {
5878 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__));
5879 return EINVAL;
5880 }
5881
5882 switch (idsrc->sadb_ident_type) {
5883 case SADB_IDENTTYPE_PREFIX:
5884 case SADB_IDENTTYPE_FQDN:
5885 case SADB_IDENTTYPE_USERFQDN:
5886 default:
5887 /* XXX do nothing */
5888 sah->idents = NULL;
5889 sah->identd = NULL;
5890 return 0;
5891 }
5892
5893 /* make structure */
5894 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
5895 if (sah->idents == NULL) {
5896 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5897 return ENOBUFS;
5898 }
5899 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
5900 if (sah->identd == NULL) {
5901 free(sah->idents, M_IPSEC_MISC);
5902 sah->idents = NULL;
5903 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5904 return ENOBUFS;
5905 }
5906 sah->idents->type = idsrc->sadb_ident_type;
5907 sah->idents->id = idsrc->sadb_ident_id;
5908
5909 sah->identd->type = iddst->sadb_ident_type;
5910 sah->identd->id = iddst->sadb_ident_id;
5911
5912 return 0;
5913 }
5914
5915 /*
5916 * m will not be freed on return.
5917 * it is caller's responsibility to free the result.
5918 *
5919 * Called from SADB_ADD and SADB_UPDATE. Reply will contain headers
5920 * from the request in defined order.
5921 */
5922 static struct mbuf *
key_getmsgbuf_x1(struct mbuf * m,const struct sadb_msghdr * mhp)5923 key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp)
5924 {
5925 struct mbuf *n;
5926
5927 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5928 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5929 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5930
5931 /* create new sadb_msg to reply. */
5932 n = key_gather_mbuf(m, mhp, 1, 16, SADB_EXT_RESERVED,
5933 SADB_EXT_SA, SADB_X_EXT_SA2,
5934 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST,
5935 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
5936 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST,
5937 SADB_X_EXT_NAT_T_TYPE, SADB_X_EXT_NAT_T_SPORT,
5938 SADB_X_EXT_NAT_T_DPORT, SADB_X_EXT_NAT_T_OAI,
5939 SADB_X_EXT_NAT_T_OAR, SADB_X_EXT_NEW_ADDRESS_SRC,
5940 SADB_X_EXT_NEW_ADDRESS_DST);
5941 if (!n)
5942 return NULL;
5943
5944 if (n->m_len < sizeof(struct sadb_msg)) {
5945 n = m_pullup(n, sizeof(struct sadb_msg));
5946 if (n == NULL)
5947 return NULL;
5948 }
5949 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0;
5950 mtod(n, struct sadb_msg *)->sadb_msg_len =
5951 PFKEY_UNIT64(n->m_pkthdr.len);
5952
5953 return n;
5954 }
5955
5956 /*
5957 * SADB_DELETE processing
5958 * receive
5959 * <base, SA(*), address(SD)>
5960 * from the ikmpd, and set SADB_SASTATE_DEAD,
5961 * and send,
5962 * <base, SA(*), address(SD)>
5963 * to the ikmpd.
5964 *
5965 * m will always be freed.
5966 */
5967 static int
key_delete(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)5968 key_delete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5969 {
5970 struct secasindex saidx;
5971 struct sadb_address *src0, *dst0;
5972 struct secasvar *sav;
5973 struct sadb_sa *sa0;
5974 uint8_t proto;
5975
5976 IPSEC_ASSERT(so != NULL, ("null socket"));
5977 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5978 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5979 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5980
5981 /* map satype to proto */
5982 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5983 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5984 __func__));
5985 return key_senderror(so, m, EINVAL);
5986 }
5987
5988 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
5989 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
5990 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
5991 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
5992 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
5993 __func__));
5994 return key_senderror(so, m, EINVAL);
5995 }
5996
5997 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
5998 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
5999
6000 if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
6001 (struct sockaddr *)(dst0 + 1)) != 0) {
6002 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
6003 return (key_senderror(so, m, EINVAL));
6004 }
6005 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
6006 if (SADB_CHECKHDR(mhp, SADB_EXT_SA)) {
6007 /*
6008 * Caller wants us to delete all non-LARVAL SAs
6009 * that match the src/dst. This is used during
6010 * IKE INITIAL-CONTACT.
6011 * XXXAE: this looks like some extension to RFC2367.
6012 */
6013 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__));
6014 return (key_delete_all(so, m, mhp, &saidx));
6015 }
6016 if (SADB_CHECKLEN(mhp, SADB_EXT_SA)) {
6017 ipseclog((LOG_DEBUG,
6018 "%s: invalid message: wrong header size.\n", __func__));
6019 return (key_senderror(so, m, EINVAL));
6020 }
6021 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
6022 if (proto == IPPROTO_TCP)
6023 sav = key_getsav_tcpmd5(&saidx, NULL);
6024 else
6025 sav = key_getsavbyspi(sa0->sadb_sa_spi);
6026 if (sav == NULL) {
6027 ipseclog((LOG_DEBUG, "%s: no SA found for SPI %u.\n",
6028 __func__, ntohl(sa0->sadb_sa_spi)));
6029 return (key_senderror(so, m, ESRCH));
6030 }
6031 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_HEAD) == 0) {
6032 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u.\n",
6033 __func__, ntohl(sav->spi)));
6034 key_freesav(&sav);
6035 return (key_senderror(so, m, ESRCH));
6036 }
6037 KEYDBG(KEY_STAMP,
6038 printf("%s: SA(%p)\n", __func__, sav));
6039 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6040 key_unlinksav(sav);
6041 key_freesav(&sav);
6042
6043 {
6044 struct mbuf *n;
6045 struct sadb_msg *newmsg;
6046
6047 /* create new sadb_msg to reply. */
6048 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
6049 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
6050 if (!n)
6051 return key_senderror(so, m, ENOBUFS);
6052
6053 if (n->m_len < sizeof(struct sadb_msg)) {
6054 n = m_pullup(n, sizeof(struct sadb_msg));
6055 if (n == NULL)
6056 return key_senderror(so, m, ENOBUFS);
6057 }
6058 newmsg = mtod(n, struct sadb_msg *);
6059 newmsg->sadb_msg_errno = 0;
6060 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
6061
6062 m_freem(m);
6063 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
6064 }
6065 }
6066
6067 /*
6068 * delete all SAs for src/dst. Called from key_delete().
6069 */
6070 static int
key_delete_all(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp,struct secasindex * saidx)6071 key_delete_all(struct socket *so, struct mbuf *m,
6072 const struct sadb_msghdr *mhp, struct secasindex *saidx)
6073 {
6074 struct secasvar_queue drainq;
6075 struct secashead *sah;
6076 struct secasvar *sav, *nextsav;
6077
6078 TAILQ_INIT(&drainq);
6079 SAHTREE_WLOCK();
6080 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
6081 if (key_cmpsaidx(&sah->saidx, saidx, CMP_HEAD) == 0)
6082 continue;
6083 /* Move all ALIVE SAs into drainq */
6084 TAILQ_CONCAT(&drainq, &sah->savtree_alive, chain);
6085 }
6086 /* Unlink all queued SAs from SPI hash */
6087 TAILQ_FOREACH(sav, &drainq, chain) {
6088 sav->state = SADB_SASTATE_DEAD;
6089 LIST_REMOVE(sav, spihash);
6090 }
6091 SAHTREE_WUNLOCK();
6092 /* Now we can release reference for all SAs in drainq */
6093 sav = TAILQ_FIRST(&drainq);
6094 while (sav != NULL) {
6095 KEYDBG(KEY_STAMP,
6096 printf("%s: SA(%p)\n", __func__, sav));
6097 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6098 nextsav = TAILQ_NEXT(sav, chain);
6099 key_freesah(&sav->sah); /* release reference from SAV */
6100 key_freesav(&sav); /* release last reference */
6101 sav = nextsav;
6102 }
6103
6104 {
6105 struct mbuf *n;
6106 struct sadb_msg *newmsg;
6107
6108 /* create new sadb_msg to reply. */
6109 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED,
6110 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
6111 if (!n)
6112 return key_senderror(so, m, ENOBUFS);
6113
6114 if (n->m_len < sizeof(struct sadb_msg)) {
6115 n = m_pullup(n, sizeof(struct sadb_msg));
6116 if (n == NULL)
6117 return key_senderror(so, m, ENOBUFS);
6118 }
6119 newmsg = mtod(n, struct sadb_msg *);
6120 newmsg->sadb_msg_errno = 0;
6121 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
6122
6123 m_freem(m);
6124 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
6125 }
6126 }
6127
6128 /*
6129 * Delete all alive SAs for corresponding xform.
6130 * Larval SAs have not initialized tdb_xform, so it is safe to leave them
6131 * here when xform disappears.
6132 */
6133 void
key_delete_xform(const struct xformsw * xsp)6134 key_delete_xform(const struct xformsw *xsp)
6135 {
6136 struct secasvar_queue drainq;
6137 struct secashead *sah;
6138 struct secasvar *sav, *nextsav;
6139
6140 TAILQ_INIT(&drainq);
6141 SAHTREE_WLOCK();
6142 TAILQ_FOREACH(sah, &V_sahtree, chain) {
6143 sav = TAILQ_FIRST(&sah->savtree_alive);
6144 if (sav == NULL)
6145 continue;
6146 if (sav->tdb_xform != xsp)
6147 continue;
6148 /*
6149 * It is supposed that all SAs in the chain are related to
6150 * one xform.
6151 */
6152 TAILQ_CONCAT(&drainq, &sah->savtree_alive, chain);
6153 }
6154 /* Unlink all queued SAs from SPI hash */
6155 TAILQ_FOREACH(sav, &drainq, chain) {
6156 sav->state = SADB_SASTATE_DEAD;
6157 LIST_REMOVE(sav, spihash);
6158 }
6159 SAHTREE_WUNLOCK();
6160
6161 /* Now we can release reference for all SAs in drainq */
6162 sav = TAILQ_FIRST(&drainq);
6163 while (sav != NULL) {
6164 KEYDBG(KEY_STAMP,
6165 printf("%s: SA(%p)\n", __func__, sav));
6166 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6167 nextsav = TAILQ_NEXT(sav, chain);
6168 key_freesah(&sav->sah); /* release reference from SAV */
6169 key_freesav(&sav); /* release last reference */
6170 sav = nextsav;
6171 }
6172 }
6173
6174 /*
6175 * SADB_GET processing
6176 * receive
6177 * <base, SA(*), address(SD)>
6178 * from the ikmpd, and get a SP and a SA to respond,
6179 * and send,
6180 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE),
6181 * (identity(SD),) (sensitivity)>
6182 * to the ikmpd.
6183 *
6184 * m will always be freed.
6185 */
6186 static int
key_get(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)6187 key_get(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6188 {
6189 struct secasindex saidx;
6190 struct sadb_address *src0, *dst0;
6191 struct sadb_sa *sa0;
6192 struct secasvar *sav;
6193 uint8_t proto;
6194
6195 IPSEC_ASSERT(so != NULL, ("null socket"));
6196 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6197 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6198 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6199
6200 /* map satype to proto */
6201 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6202 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
6203 __func__));
6204 return key_senderror(so, m, EINVAL);
6205 }
6206
6207 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
6208 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
6209 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST)) {
6210 ipseclog((LOG_DEBUG,
6211 "%s: invalid message: missing required header.\n",
6212 __func__));
6213 return key_senderror(so, m, EINVAL);
6214 }
6215 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
6216 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
6217 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
6218 ipseclog((LOG_DEBUG,
6219 "%s: invalid message: wrong header size.\n", __func__));
6220 return key_senderror(so, m, EINVAL);
6221 }
6222
6223 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
6224 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
6225 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
6226
6227 if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
6228 (struct sockaddr *)(dst0 + 1)) != 0) {
6229 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
6230 return key_senderror(so, m, EINVAL);
6231 }
6232 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
6233
6234 if (proto == IPPROTO_TCP)
6235 sav = key_getsav_tcpmd5(&saidx, NULL);
6236 else
6237 sav = key_getsavbyspi(sa0->sadb_sa_spi);
6238 if (sav == NULL) {
6239 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__));
6240 return key_senderror(so, m, ESRCH);
6241 }
6242 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_HEAD) == 0) {
6243 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u.\n",
6244 __func__, ntohl(sa0->sadb_sa_spi)));
6245 key_freesav(&sav);
6246 return (key_senderror(so, m, ESRCH));
6247 }
6248
6249 {
6250 struct mbuf *n;
6251 uint8_t satype;
6252
6253 /* map proto to satype */
6254 if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0) {
6255 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n",
6256 __func__));
6257 key_freesav(&sav);
6258 return key_senderror(so, m, EINVAL);
6259 }
6260
6261 /* create new sadb_msg to reply. */
6262 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq,
6263 mhp->msg->sadb_msg_pid);
6264
6265 key_freesav(&sav);
6266 if (!n)
6267 return key_senderror(so, m, ENOBUFS);
6268
6269 m_freem(m);
6270 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
6271 }
6272 }
6273
6274 /* XXX make it sysctl-configurable? */
6275 static void
key_getcomb_setlifetime(struct sadb_comb * comb)6276 key_getcomb_setlifetime(struct sadb_comb *comb)
6277 {
6278
6279 comb->sadb_comb_soft_allocations = 1;
6280 comb->sadb_comb_hard_allocations = 1;
6281 comb->sadb_comb_soft_bytes = 0;
6282 comb->sadb_comb_hard_bytes = 0;
6283 comb->sadb_comb_hard_addtime = 86400; /* 1 day */
6284 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100;
6285 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */
6286 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100;
6287 }
6288
6289 /*
6290 * XXX reorder combinations by preference
6291 * XXX no idea if the user wants ESP authentication or not
6292 */
6293 static struct mbuf *
key_getcomb_ealg(void)6294 key_getcomb_ealg(void)
6295 {
6296 struct sadb_comb *comb;
6297 const struct enc_xform *algo;
6298 struct mbuf *result = NULL, *m, *n;
6299 int encmin;
6300 int i, off, o;
6301 int totlen;
6302 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6303
6304 m = NULL;
6305 for (i = 1; i <= SADB_EALG_MAX; i++) {
6306 algo = enc_algorithm_lookup(i);
6307 if (algo == NULL)
6308 continue;
6309
6310 /* discard algorithms with key size smaller than system min */
6311 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin)
6312 continue;
6313 if (_BITS(algo->minkey) < V_ipsec_esp_keymin)
6314 encmin = V_ipsec_esp_keymin;
6315 else
6316 encmin = _BITS(algo->minkey);
6317
6318 if (V_ipsec_esp_auth)
6319 m = key_getcomb_ah();
6320 else {
6321 IPSEC_ASSERT(l <= MLEN,
6322 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6323 MGET(m, M_NOWAIT, MT_DATA);
6324 if (m) {
6325 M_ALIGN(m, l);
6326 m->m_len = l;
6327 m->m_next = NULL;
6328 bzero(mtod(m, caddr_t), m->m_len);
6329 }
6330 }
6331 if (!m)
6332 goto fail;
6333
6334 totlen = 0;
6335 for (n = m; n; n = n->m_next)
6336 totlen += n->m_len;
6337 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l));
6338
6339 for (off = 0; off < totlen; off += l) {
6340 n = m_pulldown(m, off, l, &o);
6341 if (!n) {
6342 /* m is already freed */
6343 goto fail;
6344 }
6345 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o);
6346 bzero(comb, sizeof(*comb));
6347 key_getcomb_setlifetime(comb);
6348 comb->sadb_comb_encrypt = i;
6349 comb->sadb_comb_encrypt_minbits = encmin;
6350 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey);
6351 }
6352
6353 if (!result)
6354 result = m;
6355 else
6356 m_cat(result, m);
6357 }
6358
6359 return result;
6360
6361 fail:
6362 if (result)
6363 m_freem(result);
6364 return NULL;
6365 }
6366
6367 static void
key_getsizes_ah(const struct auth_hash * ah,int alg,u_int16_t * min,u_int16_t * max)6368 key_getsizes_ah(const struct auth_hash *ah, int alg, u_int16_t* min,
6369 u_int16_t* max)
6370 {
6371
6372 *min = *max = ah->hashsize;
6373 if (ah->keysize == 0) {
6374 /*
6375 * Transform takes arbitrary key size but algorithm
6376 * key size is restricted. Enforce this here.
6377 */
6378 switch (alg) {
6379 case SADB_X_AALG_NULL: *min = 1; *max = 256; break;
6380 case SADB_X_AALG_SHA2_256: *min = *max = 32; break;
6381 case SADB_X_AALG_SHA2_384: *min = *max = 48; break;
6382 case SADB_X_AALG_SHA2_512: *min = *max = 64; break;
6383 default:
6384 DPRINTF(("%s: unknown AH algorithm %u\n",
6385 __func__, alg));
6386 break;
6387 }
6388 }
6389 }
6390
6391 /*
6392 * XXX reorder combinations by preference
6393 */
6394 static struct mbuf *
key_getcomb_ah(void)6395 key_getcomb_ah(void)
6396 {
6397 const struct auth_hash *algo;
6398 struct sadb_comb *comb;
6399 struct mbuf *m;
6400 u_int16_t minkeysize, maxkeysize;
6401 int i;
6402 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6403
6404 m = NULL;
6405 for (i = 1; i <= SADB_AALG_MAX; i++) {
6406 #if 1
6407 /* we prefer HMAC algorithms, not old algorithms */
6408 if (i != SADB_AALG_SHA1HMAC &&
6409 i != SADB_X_AALG_SHA2_256 &&
6410 i != SADB_X_AALG_SHA2_384 &&
6411 i != SADB_X_AALG_SHA2_512)
6412 continue;
6413 #endif
6414 algo = auth_algorithm_lookup(i);
6415 if (!algo)
6416 continue;
6417 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize);
6418 /* discard algorithms with key size smaller than system min */
6419 if (_BITS(minkeysize) < V_ipsec_ah_keymin)
6420 continue;
6421
6422 if (!m) {
6423 IPSEC_ASSERT(l <= MLEN,
6424 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6425 MGET(m, M_NOWAIT, MT_DATA);
6426 if (m) {
6427 M_ALIGN(m, l);
6428 m->m_len = l;
6429 m->m_next = NULL;
6430 }
6431 } else
6432 M_PREPEND(m, l, M_NOWAIT);
6433 if (!m)
6434 return NULL;
6435
6436 comb = mtod(m, struct sadb_comb *);
6437 bzero(comb, sizeof(*comb));
6438 key_getcomb_setlifetime(comb);
6439 comb->sadb_comb_auth = i;
6440 comb->sadb_comb_auth_minbits = _BITS(minkeysize);
6441 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize);
6442 }
6443
6444 return m;
6445 }
6446
6447 /*
6448 * not really an official behavior. discussed in pf_key@inner.net in Sep2000.
6449 * XXX reorder combinations by preference
6450 */
6451 static struct mbuf *
key_getcomb_ipcomp(void)6452 key_getcomb_ipcomp(void)
6453 {
6454 const struct comp_algo *algo;
6455 struct sadb_comb *comb;
6456 struct mbuf *m;
6457 int i;
6458 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6459
6460 m = NULL;
6461 for (i = 1; i <= SADB_X_CALG_MAX; i++) {
6462 algo = comp_algorithm_lookup(i);
6463 if (!algo)
6464 continue;
6465
6466 if (!m) {
6467 IPSEC_ASSERT(l <= MLEN,
6468 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6469 MGET(m, M_NOWAIT, MT_DATA);
6470 if (m) {
6471 M_ALIGN(m, l);
6472 m->m_len = l;
6473 m->m_next = NULL;
6474 }
6475 } else
6476 M_PREPEND(m, l, M_NOWAIT);
6477 if (!m)
6478 return NULL;
6479
6480 comb = mtod(m, struct sadb_comb *);
6481 bzero(comb, sizeof(*comb));
6482 key_getcomb_setlifetime(comb);
6483 comb->sadb_comb_encrypt = i;
6484 /* what should we set into sadb_comb_*_{min,max}bits? */
6485 }
6486
6487 return m;
6488 }
6489
6490 /*
6491 * XXX no way to pass mode (transport/tunnel) to userland
6492 * XXX replay checking?
6493 * XXX sysctl interface to ipsec_{ah,esp}_keymin
6494 */
6495 static struct mbuf *
key_getprop(const struct secasindex * saidx)6496 key_getprop(const struct secasindex *saidx)
6497 {
6498 struct sadb_prop *prop;
6499 struct mbuf *m, *n;
6500 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop));
6501 int totlen;
6502
6503 switch (saidx->proto) {
6504 case IPPROTO_ESP:
6505 m = key_getcomb_ealg();
6506 break;
6507 case IPPROTO_AH:
6508 m = key_getcomb_ah();
6509 break;
6510 case IPPROTO_IPCOMP:
6511 m = key_getcomb_ipcomp();
6512 break;
6513 default:
6514 return NULL;
6515 }
6516
6517 if (!m)
6518 return NULL;
6519 M_PREPEND(m, l, M_NOWAIT);
6520 if (!m)
6521 return NULL;
6522
6523 totlen = 0;
6524 for (n = m; n; n = n->m_next)
6525 totlen += n->m_len;
6526
6527 prop = mtod(m, struct sadb_prop *);
6528 bzero(prop, sizeof(*prop));
6529 prop->sadb_prop_len = PFKEY_UNIT64(totlen);
6530 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL;
6531 prop->sadb_prop_replay = 32; /* XXX */
6532
6533 return m;
6534 }
6535
6536 /*
6537 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2().
6538 * send
6539 * <base, SA, address(SD), (address(P)), x_policy,
6540 * (identity(SD),) (sensitivity,) proposal>
6541 * to KMD, and expect to receive
6542 * <base> with SADB_ACQUIRE if error occurred,
6543 * or
6544 * <base, src address, dst address, (SPI range)> with SADB_GETSPI
6545 * from KMD by PF_KEY.
6546 *
6547 * XXX x_policy is outside of RFC2367 (KAME extension).
6548 * XXX sensitivity is not supported.
6549 * XXX for ipcomp, RFC2367 does not define how to fill in proposal.
6550 * see comment for key_getcomb_ipcomp().
6551 *
6552 * OUT:
6553 * 0 : succeed
6554 * others: error number
6555 */
6556 static int
key_acquire(const struct secasindex * saidx,struct secpolicy * sp)6557 key_acquire(const struct secasindex *saidx, struct secpolicy *sp)
6558 {
6559 union sockaddr_union addr;
6560 struct mbuf *result, *m;
6561 uint32_t seq;
6562 int error;
6563 uint16_t ul_proto;
6564 uint8_t mask, satype;
6565
6566 IPSEC_ASSERT(saidx != NULL, ("null saidx"));
6567 satype = key_proto2satype(saidx->proto);
6568 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto));
6569
6570 error = -1;
6571 result = NULL;
6572 ul_proto = IPSEC_ULPROTO_ANY;
6573
6574 /* Get seq number to check whether sending message or not. */
6575 seq = key_getacq(saidx, &error);
6576 if (seq == 0)
6577 return (error);
6578
6579 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0);
6580 if (!m) {
6581 error = ENOBUFS;
6582 goto fail;
6583 }
6584 result = m;
6585
6586 /*
6587 * set sadb_address for saidx's.
6588 *
6589 * Note that if sp is supplied, then we're being called from
6590 * key_allocsa_policy() and should supply port and protocol
6591 * information.
6592 * XXXAE: why only TCP and UDP? ICMP and SCTP looks applicable too.
6593 * XXXAE: probably we can handle this in the ipsec[46]_allocsa().
6594 * XXXAE: it looks like we should save this info in the ACQ entry.
6595 */
6596 if (sp != NULL && (sp->spidx.ul_proto == IPPROTO_TCP ||
6597 sp->spidx.ul_proto == IPPROTO_UDP))
6598 ul_proto = sp->spidx.ul_proto;
6599
6600 addr = saidx->src;
6601 mask = FULLMASK;
6602 if (ul_proto != IPSEC_ULPROTO_ANY) {
6603 switch (sp->spidx.src.sa.sa_family) {
6604 case AF_INET:
6605 if (sp->spidx.src.sin.sin_port != IPSEC_PORT_ANY) {
6606 addr.sin.sin_port = sp->spidx.src.sin.sin_port;
6607 mask = sp->spidx.prefs;
6608 }
6609 break;
6610 case AF_INET6:
6611 if (sp->spidx.src.sin6.sin6_port != IPSEC_PORT_ANY) {
6612 addr.sin6.sin6_port =
6613 sp->spidx.src.sin6.sin6_port;
6614 mask = sp->spidx.prefs;
6615 }
6616 break;
6617 default:
6618 break;
6619 }
6620 }
6621 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &addr.sa, mask, ul_proto);
6622 if (!m) {
6623 error = ENOBUFS;
6624 goto fail;
6625 }
6626 m_cat(result, m);
6627
6628 addr = saidx->dst;
6629 mask = FULLMASK;
6630 if (ul_proto != IPSEC_ULPROTO_ANY) {
6631 switch (sp->spidx.dst.sa.sa_family) {
6632 case AF_INET:
6633 if (sp->spidx.dst.sin.sin_port != IPSEC_PORT_ANY) {
6634 addr.sin.sin_port = sp->spidx.dst.sin.sin_port;
6635 mask = sp->spidx.prefd;
6636 }
6637 break;
6638 case AF_INET6:
6639 if (sp->spidx.dst.sin6.sin6_port != IPSEC_PORT_ANY) {
6640 addr.sin6.sin6_port =
6641 sp->spidx.dst.sin6.sin6_port;
6642 mask = sp->spidx.prefd;
6643 }
6644 break;
6645 default:
6646 break;
6647 }
6648 }
6649 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &addr.sa, mask, ul_proto);
6650 if (!m) {
6651 error = ENOBUFS;
6652 goto fail;
6653 }
6654 m_cat(result, m);
6655
6656 /* XXX proxy address (optional) */
6657
6658 /*
6659 * Set sadb_x_policy. This is KAME extension to RFC2367.
6660 */
6661 if (sp != NULL) {
6662 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id,
6663 sp->priority);
6664 if (!m) {
6665 error = ENOBUFS;
6666 goto fail;
6667 }
6668 m_cat(result, m);
6669 }
6670
6671 /*
6672 * Set sadb_x_sa2 extension if saidx->reqid is not zero.
6673 * This is FreeBSD extension to RFC2367.
6674 */
6675 if (saidx->reqid != 0) {
6676 m = key_setsadbxsa2(saidx->mode, 0, saidx->reqid);
6677 if (m == NULL) {
6678 error = ENOBUFS;
6679 goto fail;
6680 }
6681 m_cat(result, m);
6682 }
6683 /* XXX identity (optional) */
6684 #if 0
6685 if (idexttype && fqdn) {
6686 /* create identity extension (FQDN) */
6687 struct sadb_ident *id;
6688 int fqdnlen;
6689
6690 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */
6691 id = (struct sadb_ident *)p;
6692 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
6693 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
6694 id->sadb_ident_exttype = idexttype;
6695 id->sadb_ident_type = SADB_IDENTTYPE_FQDN;
6696 bcopy(fqdn, id + 1, fqdnlen);
6697 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen);
6698 }
6699
6700 if (idexttype) {
6701 /* create identity extension (USERFQDN) */
6702 struct sadb_ident *id;
6703 int userfqdnlen;
6704
6705 if (userfqdn) {
6706 /* +1 for terminating-NUL */
6707 userfqdnlen = strlen(userfqdn) + 1;
6708 } else
6709 userfqdnlen = 0;
6710 id = (struct sadb_ident *)p;
6711 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
6712 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
6713 id->sadb_ident_exttype = idexttype;
6714 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN;
6715 /* XXX is it correct? */
6716 if (curproc && curproc->p_cred)
6717 id->sadb_ident_id = curproc->p_cred->p_ruid;
6718 if (userfqdn && userfqdnlen)
6719 bcopy(userfqdn, id + 1, userfqdnlen);
6720 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen);
6721 }
6722 #endif
6723
6724 /* XXX sensitivity (optional) */
6725
6726 /* create proposal/combination extension */
6727 m = key_getprop(saidx);
6728 #if 0
6729 /*
6730 * spec conformant: always attach proposal/combination extension,
6731 * the problem is that we have no way to attach it for ipcomp,
6732 * due to the way sadb_comb is declared in RFC2367.
6733 */
6734 if (!m) {
6735 error = ENOBUFS;
6736 goto fail;
6737 }
6738 m_cat(result, m);
6739 #else
6740 /*
6741 * outside of spec; make proposal/combination extension optional.
6742 */
6743 if (m)
6744 m_cat(result, m);
6745 #endif
6746
6747 if ((result->m_flags & M_PKTHDR) == 0) {
6748 error = EINVAL;
6749 goto fail;
6750 }
6751
6752 if (result->m_len < sizeof(struct sadb_msg)) {
6753 result = m_pullup(result, sizeof(struct sadb_msg));
6754 if (result == NULL) {
6755 error = ENOBUFS;
6756 goto fail;
6757 }
6758 }
6759
6760 result->m_pkthdr.len = 0;
6761 for (m = result; m; m = m->m_next)
6762 result->m_pkthdr.len += m->m_len;
6763
6764 mtod(result, struct sadb_msg *)->sadb_msg_len =
6765 PFKEY_UNIT64(result->m_pkthdr.len);
6766
6767 KEYDBG(KEY_STAMP,
6768 printf("%s: SP(%p)\n", __func__, sp));
6769 KEYDBG(KEY_DATA, kdebug_secasindex(saidx, NULL));
6770
6771 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
6772
6773 fail:
6774 if (result)
6775 m_freem(result);
6776 return error;
6777 }
6778
6779 static uint32_t
key_newacq(const struct secasindex * saidx,int * perror)6780 key_newacq(const struct secasindex *saidx, int *perror)
6781 {
6782 struct secacq *acq;
6783 uint32_t seq;
6784
6785 acq = malloc(sizeof(*acq), M_IPSEC_SAQ, M_NOWAIT | M_ZERO);
6786 if (acq == NULL) {
6787 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
6788 *perror = ENOBUFS;
6789 return (0);
6790 }
6791
6792 /* copy secindex */
6793 bcopy(saidx, &acq->saidx, sizeof(acq->saidx));
6794 acq->created = time_second;
6795 acq->count = 0;
6796
6797 /* add to acqtree */
6798 ACQ_LOCK();
6799 seq = acq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq);
6800 LIST_INSERT_HEAD(&V_acqtree, acq, chain);
6801 LIST_INSERT_HEAD(ACQADDRHASH_HASH(saidx), acq, addrhash);
6802 LIST_INSERT_HEAD(ACQSEQHASH_HASH(seq), acq, seqhash);
6803 ACQ_UNLOCK();
6804 *perror = 0;
6805 return (seq);
6806 }
6807
6808 static uint32_t
key_getacq(const struct secasindex * saidx,int * perror)6809 key_getacq(const struct secasindex *saidx, int *perror)
6810 {
6811 struct secacq *acq;
6812 uint32_t seq;
6813
6814 ACQ_LOCK();
6815 LIST_FOREACH(acq, ACQADDRHASH_HASH(saidx), addrhash) {
6816 if (key_cmpsaidx(&acq->saidx, saidx, CMP_EXACTLY)) {
6817 if (acq->count > V_key_blockacq_count) {
6818 /*
6819 * Reset counter and send message.
6820 * Also reset created time to keep ACQ for
6821 * this saidx.
6822 */
6823 acq->created = time_second;
6824 acq->count = 0;
6825 seq = acq->seq;
6826 } else {
6827 /*
6828 * Increment counter and do nothing.
6829 * We send SADB_ACQUIRE message only
6830 * for each V_key_blockacq_count packet.
6831 */
6832 acq->count++;
6833 seq = 0;
6834 }
6835 break;
6836 }
6837 }
6838 ACQ_UNLOCK();
6839 if (acq != NULL) {
6840 *perror = 0;
6841 return (seq);
6842 }
6843 /* allocate new entry */
6844 return (key_newacq(saidx, perror));
6845 }
6846
6847 static int
key_acqreset(uint32_t seq)6848 key_acqreset(uint32_t seq)
6849 {
6850 struct secacq *acq;
6851
6852 ACQ_LOCK();
6853 LIST_FOREACH(acq, ACQSEQHASH_HASH(seq), seqhash) {
6854 if (acq->seq == seq) {
6855 acq->count = 0;
6856 acq->created = time_second;
6857 break;
6858 }
6859 }
6860 ACQ_UNLOCK();
6861 if (acq == NULL)
6862 return (ESRCH);
6863 return (0);
6864 }
6865 /*
6866 * Mark ACQ entry as stale to remove it in key_flush_acq().
6867 * Called after successful SADB_GETSPI message.
6868 */
6869 static int
key_acqdone(const struct secasindex * saidx,uint32_t seq)6870 key_acqdone(const struct secasindex *saidx, uint32_t seq)
6871 {
6872 struct secacq *acq;
6873
6874 ACQ_LOCK();
6875 LIST_FOREACH(acq, ACQSEQHASH_HASH(seq), seqhash) {
6876 if (acq->seq == seq)
6877 break;
6878 }
6879 if (acq != NULL) {
6880 if (key_cmpsaidx(&acq->saidx, saidx, CMP_EXACTLY) == 0) {
6881 ipseclog((LOG_DEBUG,
6882 "%s: Mismatched saidx for ACQ %u\n", __func__, seq));
6883 acq = NULL;
6884 } else {
6885 acq->created = 0;
6886 }
6887 } else {
6888 ipseclog((LOG_DEBUG,
6889 "%s: ACQ %u is not found.\n", __func__, seq));
6890 }
6891 ACQ_UNLOCK();
6892 if (acq == NULL)
6893 return (ESRCH);
6894 return (0);
6895 }
6896
6897 static struct secspacq *
key_newspacq(struct secpolicyindex * spidx)6898 key_newspacq(struct secpolicyindex *spidx)
6899 {
6900 struct secspacq *acq;
6901
6902 /* get new entry */
6903 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO);
6904 if (acq == NULL) {
6905 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
6906 return NULL;
6907 }
6908
6909 /* copy secindex */
6910 bcopy(spidx, &acq->spidx, sizeof(acq->spidx));
6911 acq->created = time_second;
6912 acq->count = 0;
6913
6914 /* add to spacqtree */
6915 SPACQ_LOCK();
6916 LIST_INSERT_HEAD(&V_spacqtree, acq, chain);
6917 SPACQ_UNLOCK();
6918
6919 return acq;
6920 }
6921
6922 static struct secspacq *
key_getspacq(struct secpolicyindex * spidx)6923 key_getspacq(struct secpolicyindex *spidx)
6924 {
6925 struct secspacq *acq;
6926
6927 SPACQ_LOCK();
6928 LIST_FOREACH(acq, &V_spacqtree, chain) {
6929 if (key_cmpspidx_exactly(spidx, &acq->spidx)) {
6930 /* NB: return holding spacq_lock */
6931 return acq;
6932 }
6933 }
6934 SPACQ_UNLOCK();
6935
6936 return NULL;
6937 }
6938
6939 /*
6940 * SADB_ACQUIRE processing,
6941 * in first situation, is receiving
6942 * <base>
6943 * from the ikmpd, and clear sequence of its secasvar entry.
6944 *
6945 * In second situation, is receiving
6946 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
6947 * from a user land process, and return
6948 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
6949 * to the socket.
6950 *
6951 * m will always be freed.
6952 */
6953 static int
key_acquire2(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)6954 key_acquire2(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6955 {
6956 SAHTREE_RLOCK_TRACKER;
6957 struct sadb_address *src0, *dst0;
6958 struct secasindex saidx;
6959 struct secashead *sah;
6960 uint32_t reqid;
6961 int error;
6962 uint8_t mode, proto;
6963
6964 IPSEC_ASSERT(so != NULL, ("null socket"));
6965 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6966 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6967 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6968
6969 /*
6970 * Error message from KMd.
6971 * We assume that if error was occurred in IKEd, the length of PFKEY
6972 * message is equal to the size of sadb_msg structure.
6973 * We do not raise error even if error occurred in this function.
6974 */
6975 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) {
6976 /* check sequence number */
6977 if (mhp->msg->sadb_msg_seq == 0 ||
6978 mhp->msg->sadb_msg_errno == 0) {
6979 ipseclog((LOG_DEBUG, "%s: must specify sequence "
6980 "number and errno.\n", __func__));
6981 } else {
6982 /*
6983 * IKEd reported that error occurred.
6984 * XXXAE: what it expects from the kernel?
6985 * Probably we should send SADB_ACQUIRE again?
6986 * If so, reset ACQ's state.
6987 * XXXAE: it looks useless.
6988 */
6989 key_acqreset(mhp->msg->sadb_msg_seq);
6990 }
6991 m_freem(m);
6992 return (0);
6993 }
6994
6995 /*
6996 * This message is from user land.
6997 */
6998
6999 /* map satype to proto */
7000 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7001 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7002 __func__));
7003 return key_senderror(so, m, EINVAL);
7004 }
7005
7006 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
7007 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
7008 SADB_CHECKHDR(mhp, SADB_EXT_PROPOSAL)) {
7009 ipseclog((LOG_DEBUG,
7010 "%s: invalid message: missing required header.\n",
7011 __func__));
7012 return key_senderror(so, m, EINVAL);
7013 }
7014 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
7015 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
7016 SADB_CHECKLEN(mhp, SADB_EXT_PROPOSAL)) {
7017 ipseclog((LOG_DEBUG,
7018 "%s: invalid message: wrong header size.\n", __func__));
7019 return key_senderror(so, m, EINVAL);
7020 }
7021
7022 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
7023 mode = IPSEC_MODE_ANY;
7024 reqid = 0;
7025 } else {
7026 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
7027 ipseclog((LOG_DEBUG,
7028 "%s: invalid message: wrong header size.\n",
7029 __func__));
7030 return key_senderror(so, m, EINVAL);
7031 }
7032 mode = ((struct sadb_x_sa2 *)
7033 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
7034 reqid = ((struct sadb_x_sa2 *)
7035 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
7036 }
7037
7038 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
7039 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
7040
7041 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
7042 (struct sockaddr *)(dst0 + 1));
7043 if (error != 0) {
7044 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
7045 return key_senderror(so, m, EINVAL);
7046 }
7047 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
7048
7049 /* get a SA index */
7050 SAHTREE_RLOCK();
7051 LIST_FOREACH(sah, SAHADDRHASH_HASH(&saidx), addrhash) {
7052 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID))
7053 break;
7054 }
7055 SAHTREE_RUNLOCK();
7056 if (sah != NULL) {
7057 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__));
7058 return key_senderror(so, m, EEXIST);
7059 }
7060
7061 error = key_acquire(&saidx, NULL);
7062 if (error != 0) {
7063 ipseclog((LOG_DEBUG,
7064 "%s: error %d returned from key_acquire()\n",
7065 __func__, error));
7066 return key_senderror(so, m, error);
7067 }
7068 m_freem(m);
7069 return (0);
7070 }
7071
7072 /*
7073 * SADB_REGISTER processing.
7074 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported.
7075 * receive
7076 * <base>
7077 * from the ikmpd, and register a socket to send PF_KEY messages,
7078 * and send
7079 * <base, supported>
7080 * to KMD by PF_KEY.
7081 * If socket is detached, must free from regnode.
7082 *
7083 * m will always be freed.
7084 */
7085 static int
key_register(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7086 key_register(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7087 {
7088 struct secreg *reg, *newreg = NULL;
7089
7090 IPSEC_ASSERT(so != NULL, ("null socket"));
7091 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7092 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7093 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7094
7095 /* check for invalid register message */
7096 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0]))
7097 return key_senderror(so, m, EINVAL);
7098
7099 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */
7100 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC)
7101 goto setmsg;
7102
7103 /* check whether existing or not */
7104 REGTREE_LOCK();
7105 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) {
7106 if (reg->so == so) {
7107 REGTREE_UNLOCK();
7108 ipseclog((LOG_DEBUG, "%s: socket exists already.\n",
7109 __func__));
7110 return key_senderror(so, m, EEXIST);
7111 }
7112 }
7113
7114 /* create regnode */
7115 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO);
7116 if (newreg == NULL) {
7117 REGTREE_UNLOCK();
7118 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
7119 return key_senderror(so, m, ENOBUFS);
7120 }
7121
7122 newreg->so = so;
7123 ((struct keycb *)sotorawcb(so))->kp_registered++;
7124
7125 /* add regnode to regtree. */
7126 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain);
7127 REGTREE_UNLOCK();
7128
7129 setmsg:
7130 {
7131 struct mbuf *n;
7132 struct sadb_msg *newmsg;
7133 struct sadb_supported *sup;
7134 u_int len, alen, elen;
7135 int off;
7136 int i;
7137 struct sadb_alg *alg;
7138
7139 /* create new sadb_msg to reply. */
7140 alen = 0;
7141 for (i = 1; i <= SADB_AALG_MAX; i++) {
7142 if (auth_algorithm_lookup(i))
7143 alen += sizeof(struct sadb_alg);
7144 }
7145 if (alen)
7146 alen += sizeof(struct sadb_supported);
7147 elen = 0;
7148 for (i = 1; i <= SADB_EALG_MAX; i++) {
7149 if (enc_algorithm_lookup(i))
7150 elen += sizeof(struct sadb_alg);
7151 }
7152 if (elen)
7153 elen += sizeof(struct sadb_supported);
7154
7155 len = sizeof(struct sadb_msg) + alen + elen;
7156
7157 if (len > MCLBYTES)
7158 return key_senderror(so, m, ENOBUFS);
7159
7160 n = key_mget(len);
7161 if (n == NULL)
7162 return key_senderror(so, m, ENOBUFS);
7163
7164 n->m_pkthdr.len = n->m_len = len;
7165 n->m_next = NULL;
7166 off = 0;
7167
7168 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
7169 newmsg = mtod(n, struct sadb_msg *);
7170 newmsg->sadb_msg_errno = 0;
7171 newmsg->sadb_msg_len = PFKEY_UNIT64(len);
7172 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
7173
7174 /* for authentication algorithm */
7175 if (alen) {
7176 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
7177 sup->sadb_supported_len = PFKEY_UNIT64(alen);
7178 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
7179 off += PFKEY_ALIGN8(sizeof(*sup));
7180
7181 for (i = 1; i <= SADB_AALG_MAX; i++) {
7182 const struct auth_hash *aalgo;
7183 u_int16_t minkeysize, maxkeysize;
7184
7185 aalgo = auth_algorithm_lookup(i);
7186 if (!aalgo)
7187 continue;
7188 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
7189 alg->sadb_alg_id = i;
7190 alg->sadb_alg_ivlen = 0;
7191 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize);
7192 alg->sadb_alg_minbits = _BITS(minkeysize);
7193 alg->sadb_alg_maxbits = _BITS(maxkeysize);
7194 off += PFKEY_ALIGN8(sizeof(*alg));
7195 }
7196 }
7197
7198 /* for encryption algorithm */
7199 if (elen) {
7200 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
7201 sup->sadb_supported_len = PFKEY_UNIT64(elen);
7202 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
7203 off += PFKEY_ALIGN8(sizeof(*sup));
7204
7205 for (i = 1; i <= SADB_EALG_MAX; i++) {
7206 const struct enc_xform *ealgo;
7207
7208 ealgo = enc_algorithm_lookup(i);
7209 if (!ealgo)
7210 continue;
7211 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
7212 alg->sadb_alg_id = i;
7213 alg->sadb_alg_ivlen = ealgo->ivsize;
7214 alg->sadb_alg_minbits = _BITS(ealgo->minkey);
7215 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey);
7216 off += PFKEY_ALIGN8(sizeof(struct sadb_alg));
7217 }
7218 }
7219
7220 IPSEC_ASSERT(off == len,
7221 ("length assumption failed (off %u len %u)", off, len));
7222
7223 m_freem(m);
7224 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED);
7225 }
7226 }
7227
7228 /*
7229 * free secreg entry registered.
7230 * XXX: I want to do free a socket marked done SADB_RESIGER to socket.
7231 */
7232 void
key_freereg(struct socket * so)7233 key_freereg(struct socket *so)
7234 {
7235 struct secreg *reg;
7236 int i;
7237
7238 IPSEC_ASSERT(so != NULL, ("NULL so"));
7239
7240 /*
7241 * check whether existing or not.
7242 * check all type of SA, because there is a potential that
7243 * one socket is registered to multiple type of SA.
7244 */
7245 REGTREE_LOCK();
7246 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
7247 LIST_FOREACH(reg, &V_regtree[i], chain) {
7248 if (reg->so == so && __LIST_CHAINED(reg)) {
7249 LIST_REMOVE(reg, chain);
7250 free(reg, M_IPSEC_SAR);
7251 break;
7252 }
7253 }
7254 }
7255 REGTREE_UNLOCK();
7256 }
7257
7258 /*
7259 * SADB_EXPIRE processing
7260 * send
7261 * <base, SA, SA2, lifetime(C and one of HS), address(SD)>
7262 * to KMD by PF_KEY.
7263 * NOTE: We send only soft lifetime extension.
7264 *
7265 * OUT: 0 : succeed
7266 * others : error number
7267 */
7268 static int
key_expire(struct secasvar * sav,int hard)7269 key_expire(struct secasvar *sav, int hard)
7270 {
7271 struct mbuf *result = NULL, *m;
7272 struct sadb_lifetime *lt;
7273 uint32_t replay_count;
7274 int error, len;
7275 uint8_t satype;
7276
7277 SECASVAR_RLOCK_TRACKER;
7278
7279 IPSEC_ASSERT (sav != NULL, ("null sav"));
7280 IPSEC_ASSERT (sav->sah != NULL, ("null sa header"));
7281
7282 KEYDBG(KEY_STAMP,
7283 printf("%s: SA(%p) expired %s lifetime\n", __func__,
7284 sav, hard ? "hard": "soft"));
7285 KEYDBG(KEY_DATA, kdebug_secasv(sav));
7286 /* set msg header */
7287 satype = key_proto2satype(sav->sah->saidx.proto);
7288 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype));
7289 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt);
7290 if (!m) {
7291 error = ENOBUFS;
7292 goto fail;
7293 }
7294 result = m;
7295
7296 /* create SA extension */
7297 m = key_setsadbsa(sav);
7298 if (!m) {
7299 error = ENOBUFS;
7300 goto fail;
7301 }
7302 m_cat(result, m);
7303
7304 /* create SA extension */
7305 SECASVAR_RLOCK(sav);
7306 replay_count = sav->replay ? sav->replay->count : 0;
7307 SECASVAR_RUNLOCK(sav);
7308
7309 m = key_setsadbxsa2(sav->sah->saidx.mode, replay_count,
7310 sav->sah->saidx.reqid);
7311 if (!m) {
7312 error = ENOBUFS;
7313 goto fail;
7314 }
7315 m_cat(result, m);
7316
7317 if (sav->replay && sav->replay->wsize > UINT8_MAX) {
7318 m = key_setsadbxsareplay(sav->replay->wsize);
7319 if (!m) {
7320 error = ENOBUFS;
7321 goto fail;
7322 }
7323 m_cat(result, m);
7324 }
7325
7326 /* create lifetime extension (current and soft) */
7327 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
7328 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
7329 if (m == NULL) {
7330 error = ENOBUFS;
7331 goto fail;
7332 }
7333 m_align(m, len);
7334 m->m_len = len;
7335 bzero(mtod(m, caddr_t), len);
7336 lt = mtod(m, struct sadb_lifetime *);
7337 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
7338 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
7339 lt->sadb_lifetime_allocations =
7340 (uint32_t)counter_u64_fetch(sav->lft_c_allocations);
7341 lt->sadb_lifetime_bytes =
7342 counter_u64_fetch(sav->lft_c_bytes);
7343 lt->sadb_lifetime_addtime = sav->created;
7344 lt->sadb_lifetime_usetime = sav->firstused;
7345 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
7346 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
7347 if (hard) {
7348 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
7349 lt->sadb_lifetime_allocations = sav->lft_h->allocations;
7350 lt->sadb_lifetime_bytes = sav->lft_h->bytes;
7351 lt->sadb_lifetime_addtime = sav->lft_h->addtime;
7352 lt->sadb_lifetime_usetime = sav->lft_h->usetime;
7353 } else {
7354 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
7355 lt->sadb_lifetime_allocations = sav->lft_s->allocations;
7356 lt->sadb_lifetime_bytes = sav->lft_s->bytes;
7357 lt->sadb_lifetime_addtime = sav->lft_s->addtime;
7358 lt->sadb_lifetime_usetime = sav->lft_s->usetime;
7359 }
7360 m_cat(result, m);
7361
7362 /* set sadb_address for source */
7363 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
7364 &sav->sah->saidx.src.sa,
7365 FULLMASK, IPSEC_ULPROTO_ANY);
7366 if (!m) {
7367 error = ENOBUFS;
7368 goto fail;
7369 }
7370 m_cat(result, m);
7371
7372 /* set sadb_address for destination */
7373 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
7374 &sav->sah->saidx.dst.sa,
7375 FULLMASK, IPSEC_ULPROTO_ANY);
7376 if (!m) {
7377 error = ENOBUFS;
7378 goto fail;
7379 }
7380 m_cat(result, m);
7381
7382 /*
7383 * XXX-BZ Handle NAT-T extensions here.
7384 * XXXAE: it doesn't seem quite useful. IKEs should not depend on
7385 * this information, we report only significant SA fields.
7386 */
7387
7388 if ((result->m_flags & M_PKTHDR) == 0) {
7389 error = EINVAL;
7390 goto fail;
7391 }
7392
7393 if (result->m_len < sizeof(struct sadb_msg)) {
7394 result = m_pullup(result, sizeof(struct sadb_msg));
7395 if (result == NULL) {
7396 error = ENOBUFS;
7397 goto fail;
7398 }
7399 }
7400
7401 result->m_pkthdr.len = 0;
7402 for (m = result; m; m = m->m_next)
7403 result->m_pkthdr.len += m->m_len;
7404
7405 mtod(result, struct sadb_msg *)->sadb_msg_len =
7406 PFKEY_UNIT64(result->m_pkthdr.len);
7407
7408 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
7409
7410 fail:
7411 if (result)
7412 m_freem(result);
7413 return error;
7414 }
7415
7416 static void
key_freesah_flushed(struct secashead_queue * flushq)7417 key_freesah_flushed(struct secashead_queue *flushq)
7418 {
7419 struct secashead *sah, *nextsah;
7420 struct secasvar *sav, *nextsav;
7421
7422 sah = TAILQ_FIRST(flushq);
7423 while (sah != NULL) {
7424 sav = TAILQ_FIRST(&sah->savtree_larval);
7425 while (sav != NULL) {
7426 nextsav = TAILQ_NEXT(sav, chain);
7427 TAILQ_REMOVE(&sah->savtree_larval, sav, chain);
7428 key_freesav(&sav); /* release last reference */
7429 key_freesah(&sah); /* release reference from SAV */
7430 sav = nextsav;
7431 }
7432 sav = TAILQ_FIRST(&sah->savtree_alive);
7433 while (sav != NULL) {
7434 nextsav = TAILQ_NEXT(sav, chain);
7435 TAILQ_REMOVE(&sah->savtree_alive, sav, chain);
7436 key_freesav(&sav); /* release last reference */
7437 key_freesah(&sah); /* release reference from SAV */
7438 sav = nextsav;
7439 }
7440 nextsah = TAILQ_NEXT(sah, chain);
7441 key_freesah(&sah); /* release last reference */
7442 sah = nextsah;
7443 }
7444 }
7445
7446 /*
7447 * SADB_FLUSH processing
7448 * receive
7449 * <base>
7450 * from the ikmpd, and free all entries in secastree.
7451 * and send,
7452 * <base>
7453 * to the ikmpd.
7454 * NOTE: to do is only marking SADB_SASTATE_DEAD.
7455 *
7456 * m will always be freed.
7457 */
7458 static int
key_flush(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7459 key_flush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7460 {
7461 struct secashead_queue flushq;
7462 struct sadb_msg *newmsg;
7463 struct secashead *sah, *nextsah;
7464 struct secasvar *sav;
7465 uint8_t proto;
7466 int i;
7467
7468 IPSEC_ASSERT(so != NULL, ("null socket"));
7469 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7470 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7471
7472 /* map satype to proto */
7473 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7474 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7475 __func__));
7476 return key_senderror(so, m, EINVAL);
7477 }
7478 KEYDBG(KEY_STAMP,
7479 printf("%s: proto %u\n", __func__, proto));
7480
7481 TAILQ_INIT(&flushq);
7482 if (proto == IPSEC_PROTO_ANY) {
7483 /* no SATYPE specified, i.e. flushing all SA. */
7484 SAHTREE_WLOCK();
7485 /* Move all SAHs into flushq */
7486 TAILQ_CONCAT(&flushq, &V_sahtree, chain);
7487 /* Flush all buckets in SPI hash */
7488 for (i = 0; i < V_savhash_mask + 1; i++)
7489 LIST_INIT(&V_savhashtbl[i]);
7490 /* Flush all buckets in SAHADDRHASH */
7491 for (i = 0; i < V_sahaddrhash_mask + 1; i++)
7492 LIST_INIT(&V_sahaddrhashtbl[i]);
7493 /* Mark all SAHs as unlinked */
7494 TAILQ_FOREACH(sah, &flushq, chain) {
7495 sah->state = SADB_SASTATE_DEAD;
7496 /*
7497 * Callout handler makes its job using
7498 * RLOCK and drain queues. In case, when this
7499 * function will be called just before it
7500 * acquires WLOCK, we need to mark SAs as
7501 * unlinked to prevent second unlink.
7502 */
7503 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7504 sav->state = SADB_SASTATE_DEAD;
7505 }
7506 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7507 sav->state = SADB_SASTATE_DEAD;
7508 }
7509 }
7510 SAHTREE_WUNLOCK();
7511 } else {
7512 SAHTREE_WLOCK();
7513 sah = TAILQ_FIRST(&V_sahtree);
7514 while (sah != NULL) {
7515 IPSEC_ASSERT(sah->state != SADB_SASTATE_DEAD,
7516 ("DEAD SAH %p in SADB_FLUSH", sah));
7517 nextsah = TAILQ_NEXT(sah, chain);
7518 if (sah->saidx.proto != proto) {
7519 sah = nextsah;
7520 continue;
7521 }
7522 sah->state = SADB_SASTATE_DEAD;
7523 TAILQ_REMOVE(&V_sahtree, sah, chain);
7524 LIST_REMOVE(sah, addrhash);
7525 /* Unlink all SAs from SPI hash */
7526 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7527 LIST_REMOVE(sav, spihash);
7528 sav->state = SADB_SASTATE_DEAD;
7529 }
7530 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7531 LIST_REMOVE(sav, spihash);
7532 sav->state = SADB_SASTATE_DEAD;
7533 }
7534 /* Add SAH into flushq */
7535 TAILQ_INSERT_HEAD(&flushq, sah, chain);
7536 sah = nextsah;
7537 }
7538 SAHTREE_WUNLOCK();
7539 }
7540
7541 key_freesah_flushed(&flushq);
7542 /* Free all queued SAs and SAHs */
7543 if (m->m_len < sizeof(struct sadb_msg) ||
7544 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
7545 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
7546 return key_senderror(so, m, ENOBUFS);
7547 }
7548
7549 if (m->m_next)
7550 m_freem(m->m_next);
7551 m->m_next = NULL;
7552 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg);
7553 newmsg = mtod(m, struct sadb_msg *);
7554 newmsg->sadb_msg_errno = 0;
7555 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
7556
7557 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7558 }
7559
7560 /*
7561 * SADB_DUMP processing
7562 * dump all entries including status of DEAD in SAD.
7563 * receive
7564 * <base>
7565 * from the ikmpd, and dump all secasvar leaves
7566 * and send,
7567 * <base> .....
7568 * to the ikmpd.
7569 *
7570 * m will always be freed.
7571 */
7572 static int
key_dump(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7573 key_dump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7574 {
7575 SAHTREE_RLOCK_TRACKER;
7576 struct secashead *sah;
7577 struct secasvar *sav;
7578 struct mbuf *n;
7579 uint32_t cnt;
7580 uint8_t proto, satype;
7581
7582 IPSEC_ASSERT(so != NULL, ("null socket"));
7583 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7584 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7585 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7586
7587 /* map satype to proto */
7588 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7589 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7590 __func__));
7591 return key_senderror(so, m, EINVAL);
7592 }
7593
7594 /* count sav entries to be sent to the userland. */
7595 cnt = 0;
7596 SAHTREE_RLOCK();
7597 TAILQ_FOREACH(sah, &V_sahtree, chain) {
7598 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
7599 proto != sah->saidx.proto)
7600 continue;
7601
7602 TAILQ_FOREACH(sav, &sah->savtree_larval, chain)
7603 cnt++;
7604 TAILQ_FOREACH(sav, &sah->savtree_alive, chain)
7605 cnt++;
7606 }
7607
7608 if (cnt == 0) {
7609 SAHTREE_RUNLOCK();
7610 return key_senderror(so, m, ENOENT);
7611 }
7612
7613 /* send this to the userland, one at a time. */
7614 TAILQ_FOREACH(sah, &V_sahtree, chain) {
7615 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
7616 proto != sah->saidx.proto)
7617 continue;
7618
7619 /* map proto to satype */
7620 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
7621 SAHTREE_RUNLOCK();
7622 ipseclog((LOG_DEBUG, "%s: there was invalid proto in "
7623 "SAD.\n", __func__));
7624 return key_senderror(so, m, EINVAL);
7625 }
7626 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7627 n = key_setdumpsa(sav, SADB_DUMP, satype,
7628 --cnt, mhp->msg->sadb_msg_pid);
7629 if (n == NULL) {
7630 SAHTREE_RUNLOCK();
7631 return key_senderror(so, m, ENOBUFS);
7632 }
7633 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
7634 }
7635 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7636 n = key_setdumpsa(sav, SADB_DUMP, satype,
7637 --cnt, mhp->msg->sadb_msg_pid);
7638 if (n == NULL) {
7639 SAHTREE_RUNLOCK();
7640 return key_senderror(so, m, ENOBUFS);
7641 }
7642 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
7643 }
7644 }
7645 SAHTREE_RUNLOCK();
7646 m_freem(m);
7647 return (0);
7648 }
7649 /*
7650 * SADB_X_PROMISC processing
7651 *
7652 * m will always be freed.
7653 */
7654 static int
key_promisc(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7655 key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7656 {
7657 int olen;
7658
7659 IPSEC_ASSERT(so != NULL, ("null socket"));
7660 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7661 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7662 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7663
7664 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
7665
7666 if (olen < sizeof(struct sadb_msg)) {
7667 #if 1
7668 return key_senderror(so, m, EINVAL);
7669 #else
7670 m_freem(m);
7671 return 0;
7672 #endif
7673 } else if (olen == sizeof(struct sadb_msg)) {
7674 /* enable/disable promisc mode */
7675 struct keycb *kp;
7676
7677 if ((kp = (struct keycb *)sotorawcb(so)) == NULL)
7678 return key_senderror(so, m, EINVAL);
7679 mhp->msg->sadb_msg_errno = 0;
7680 switch (mhp->msg->sadb_msg_satype) {
7681 case 0:
7682 case 1:
7683 kp->kp_promisc = mhp->msg->sadb_msg_satype;
7684 break;
7685 default:
7686 return key_senderror(so, m, EINVAL);
7687 }
7688
7689 /* send the original message back to everyone */
7690 mhp->msg->sadb_msg_errno = 0;
7691 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7692 } else {
7693 /* send packet as is */
7694
7695 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg)));
7696
7697 /* TODO: if sadb_msg_seq is specified, send to specific pid */
7698 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7699 }
7700 }
7701
7702 static int (*key_typesw[])(struct socket *, struct mbuf *,
7703 const struct sadb_msghdr *) = {
7704 NULL, /* SADB_RESERVED */
7705 key_getspi, /* SADB_GETSPI */
7706 key_update, /* SADB_UPDATE */
7707 key_add, /* SADB_ADD */
7708 key_delete, /* SADB_DELETE */
7709 key_get, /* SADB_GET */
7710 key_acquire2, /* SADB_ACQUIRE */
7711 key_register, /* SADB_REGISTER */
7712 NULL, /* SADB_EXPIRE */
7713 key_flush, /* SADB_FLUSH */
7714 key_dump, /* SADB_DUMP */
7715 key_promisc, /* SADB_X_PROMISC */
7716 NULL, /* SADB_X_PCHANGE */
7717 key_spdadd, /* SADB_X_SPDUPDATE */
7718 key_spdadd, /* SADB_X_SPDADD */
7719 key_spddelete, /* SADB_X_SPDDELETE */
7720 key_spdget, /* SADB_X_SPDGET */
7721 NULL, /* SADB_X_SPDACQUIRE */
7722 key_spddump, /* SADB_X_SPDDUMP */
7723 key_spdflush, /* SADB_X_SPDFLUSH */
7724 key_spdadd, /* SADB_X_SPDSETIDX */
7725 NULL, /* SADB_X_SPDEXPIRE */
7726 key_spddelete2, /* SADB_X_SPDDELETE2 */
7727 };
7728
7729 /*
7730 * parse sadb_msg buffer to process PFKEYv2,
7731 * and create a data to response if needed.
7732 * I think to be dealed with mbuf directly.
7733 * IN:
7734 * msgp : pointer to pointer to a received buffer pulluped.
7735 * This is rewrited to response.
7736 * so : pointer to socket.
7737 * OUT:
7738 * length for buffer to send to user process.
7739 */
7740 int
key_parse(struct mbuf * m,struct socket * so)7741 key_parse(struct mbuf *m, struct socket *so)
7742 {
7743 struct sadb_msg *msg;
7744 struct sadb_msghdr mh;
7745 u_int orglen;
7746 int error;
7747 int target;
7748
7749 IPSEC_ASSERT(so != NULL, ("null socket"));
7750 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7751
7752 if (m->m_len < sizeof(struct sadb_msg)) {
7753 m = m_pullup(m, sizeof(struct sadb_msg));
7754 if (!m)
7755 return ENOBUFS;
7756 }
7757 msg = mtod(m, struct sadb_msg *);
7758 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len);
7759 target = KEY_SENDUP_ONE;
7760
7761 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len != orglen) {
7762 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__));
7763 PFKEYSTAT_INC(out_invlen);
7764 error = EINVAL;
7765 goto senderror;
7766 }
7767
7768 if (msg->sadb_msg_version != PF_KEY_V2) {
7769 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n",
7770 __func__, msg->sadb_msg_version));
7771 PFKEYSTAT_INC(out_invver);
7772 error = EINVAL;
7773 goto senderror;
7774 }
7775
7776 if (msg->sadb_msg_type > SADB_MAX) {
7777 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
7778 __func__, msg->sadb_msg_type));
7779 PFKEYSTAT_INC(out_invmsgtype);
7780 error = EINVAL;
7781 goto senderror;
7782 }
7783
7784 /* for old-fashioned code - should be nuked */
7785 if (m->m_pkthdr.len > MCLBYTES) {
7786 m_freem(m);
7787 return ENOBUFS;
7788 }
7789 if (m->m_next) {
7790 struct mbuf *n;
7791
7792 n = key_mget(m->m_pkthdr.len);
7793 if (n == NULL) {
7794 m_freem(m);
7795 return ENOBUFS;
7796 }
7797 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
7798 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len;
7799 n->m_next = NULL;
7800 m_freem(m);
7801 m = n;
7802 }
7803
7804 /* align the mbuf chain so that extensions are in contiguous region. */
7805 error = key_align(m, &mh);
7806 if (error)
7807 return error;
7808
7809 msg = mh.msg;
7810
7811 /* We use satype as scope mask for spddump */
7812 if (msg->sadb_msg_type == SADB_X_SPDDUMP) {
7813 switch (msg->sadb_msg_satype) {
7814 case IPSEC_POLICYSCOPE_ANY:
7815 case IPSEC_POLICYSCOPE_GLOBAL:
7816 case IPSEC_POLICYSCOPE_IFNET:
7817 case IPSEC_POLICYSCOPE_PCB:
7818 break;
7819 default:
7820 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
7821 __func__, msg->sadb_msg_type));
7822 PFKEYSTAT_INC(out_invsatype);
7823 error = EINVAL;
7824 goto senderror;
7825 }
7826 } else {
7827 switch (msg->sadb_msg_satype) { /* check SA type */
7828 case SADB_SATYPE_UNSPEC:
7829 switch (msg->sadb_msg_type) {
7830 case SADB_GETSPI:
7831 case SADB_UPDATE:
7832 case SADB_ADD:
7833 case SADB_DELETE:
7834 case SADB_GET:
7835 case SADB_ACQUIRE:
7836 case SADB_EXPIRE:
7837 ipseclog((LOG_DEBUG, "%s: must specify satype "
7838 "when msg type=%u.\n", __func__,
7839 msg->sadb_msg_type));
7840 PFKEYSTAT_INC(out_invsatype);
7841 error = EINVAL;
7842 goto senderror;
7843 }
7844 break;
7845 case SADB_SATYPE_AH:
7846 case SADB_SATYPE_ESP:
7847 case SADB_X_SATYPE_IPCOMP:
7848 case SADB_X_SATYPE_TCPSIGNATURE:
7849 switch (msg->sadb_msg_type) {
7850 case SADB_X_SPDADD:
7851 case SADB_X_SPDDELETE:
7852 case SADB_X_SPDGET:
7853 case SADB_X_SPDFLUSH:
7854 case SADB_X_SPDSETIDX:
7855 case SADB_X_SPDUPDATE:
7856 case SADB_X_SPDDELETE2:
7857 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
7858 __func__, msg->sadb_msg_type));
7859 PFKEYSTAT_INC(out_invsatype);
7860 error = EINVAL;
7861 goto senderror;
7862 }
7863 break;
7864 case SADB_SATYPE_RSVP:
7865 case SADB_SATYPE_OSPFV2:
7866 case SADB_SATYPE_RIPV2:
7867 case SADB_SATYPE_MIP:
7868 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n",
7869 __func__, msg->sadb_msg_satype));
7870 PFKEYSTAT_INC(out_invsatype);
7871 error = EOPNOTSUPP;
7872 goto senderror;
7873 case 1: /* XXX: What does it do? */
7874 if (msg->sadb_msg_type == SADB_X_PROMISC)
7875 break;
7876 /*FALLTHROUGH*/
7877 default:
7878 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
7879 __func__, msg->sadb_msg_satype));
7880 PFKEYSTAT_INC(out_invsatype);
7881 error = EINVAL;
7882 goto senderror;
7883 }
7884 }
7885
7886 /* check field of upper layer protocol and address family */
7887 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL
7888 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) {
7889 struct sadb_address *src0, *dst0;
7890 u_int plen;
7891
7892 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]);
7893 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]);
7894
7895 /* check upper layer protocol */
7896 if (src0->sadb_address_proto != dst0->sadb_address_proto) {
7897 ipseclog((LOG_DEBUG, "%s: upper layer protocol "
7898 "mismatched.\n", __func__));
7899 PFKEYSTAT_INC(out_invaddr);
7900 error = EINVAL;
7901 goto senderror;
7902 }
7903
7904 /* check family */
7905 if (PFKEY_ADDR_SADDR(src0)->sa_family !=
7906 PFKEY_ADDR_SADDR(dst0)->sa_family) {
7907 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n",
7908 __func__));
7909 PFKEYSTAT_INC(out_invaddr);
7910 error = EINVAL;
7911 goto senderror;
7912 }
7913 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
7914 PFKEY_ADDR_SADDR(dst0)->sa_len) {
7915 ipseclog((LOG_DEBUG, "%s: address struct size "
7916 "mismatched.\n", __func__));
7917 PFKEYSTAT_INC(out_invaddr);
7918 error = EINVAL;
7919 goto senderror;
7920 }
7921
7922 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
7923 case AF_INET:
7924 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
7925 sizeof(struct sockaddr_in)) {
7926 PFKEYSTAT_INC(out_invaddr);
7927 error = EINVAL;
7928 goto senderror;
7929 }
7930 break;
7931 case AF_INET6:
7932 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
7933 sizeof(struct sockaddr_in6)) {
7934 PFKEYSTAT_INC(out_invaddr);
7935 error = EINVAL;
7936 goto senderror;
7937 }
7938 break;
7939 default:
7940 ipseclog((LOG_DEBUG, "%s: unsupported address family\n",
7941 __func__));
7942 PFKEYSTAT_INC(out_invaddr);
7943 error = EAFNOSUPPORT;
7944 goto senderror;
7945 }
7946
7947 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
7948 case AF_INET:
7949 plen = sizeof(struct in_addr) << 3;
7950 break;
7951 case AF_INET6:
7952 plen = sizeof(struct in6_addr) << 3;
7953 break;
7954 default:
7955 plen = 0; /*fool gcc*/
7956 break;
7957 }
7958
7959 /* check max prefix length */
7960 if (src0->sadb_address_prefixlen > plen ||
7961 dst0->sadb_address_prefixlen > plen) {
7962 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n",
7963 __func__));
7964 PFKEYSTAT_INC(out_invaddr);
7965 error = EINVAL;
7966 goto senderror;
7967 }
7968
7969 /*
7970 * prefixlen == 0 is valid because there can be a case when
7971 * all addresses are matched.
7972 */
7973 }
7974
7975 if (msg->sadb_msg_type >= nitems(key_typesw) ||
7976 key_typesw[msg->sadb_msg_type] == NULL) {
7977 PFKEYSTAT_INC(out_invmsgtype);
7978 error = EINVAL;
7979 goto senderror;
7980 }
7981
7982 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh);
7983
7984 senderror:
7985 msg->sadb_msg_errno = error;
7986 return key_sendup_mbuf(so, m, target);
7987 }
7988
7989 static int
key_senderror(struct socket * so,struct mbuf * m,int code)7990 key_senderror(struct socket *so, struct mbuf *m, int code)
7991 {
7992 struct sadb_msg *msg;
7993
7994 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
7995 ("mbuf too small, len %u", m->m_len));
7996
7997 msg = mtod(m, struct sadb_msg *);
7998 msg->sadb_msg_errno = code;
7999 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
8000 }
8001
8002 /*
8003 * set the pointer to each header into message buffer.
8004 * m will be freed on error.
8005 * XXX larger-than-MCLBYTES extension?
8006 */
8007 static int
key_align(struct mbuf * m,struct sadb_msghdr * mhp)8008 key_align(struct mbuf *m, struct sadb_msghdr *mhp)
8009 {
8010 struct mbuf *n;
8011 struct sadb_ext *ext;
8012 size_t off, end;
8013 int extlen;
8014 int toff;
8015
8016 IPSEC_ASSERT(m != NULL, ("null mbuf"));
8017 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
8018 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
8019 ("mbuf too small, len %u", m->m_len));
8020
8021 /* initialize */
8022 bzero(mhp, sizeof(*mhp));
8023
8024 mhp->msg = mtod(m, struct sadb_msg *);
8025 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */
8026
8027 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
8028 extlen = end; /*just in case extlen is not updated*/
8029 for (off = sizeof(struct sadb_msg); off < end; off += extlen) {
8030 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff);
8031 if (!n) {
8032 /* m is already freed */
8033 return ENOBUFS;
8034 }
8035 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
8036
8037 /* set pointer */
8038 switch (ext->sadb_ext_type) {
8039 case SADB_EXT_SA:
8040 case SADB_EXT_ADDRESS_SRC:
8041 case SADB_EXT_ADDRESS_DST:
8042 case SADB_EXT_ADDRESS_PROXY:
8043 case SADB_EXT_LIFETIME_CURRENT:
8044 case SADB_EXT_LIFETIME_HARD:
8045 case SADB_EXT_LIFETIME_SOFT:
8046 case SADB_EXT_KEY_AUTH:
8047 case SADB_EXT_KEY_ENCRYPT:
8048 case SADB_EXT_IDENTITY_SRC:
8049 case SADB_EXT_IDENTITY_DST:
8050 case SADB_EXT_SENSITIVITY:
8051 case SADB_EXT_PROPOSAL:
8052 case SADB_EXT_SUPPORTED_AUTH:
8053 case SADB_EXT_SUPPORTED_ENCRYPT:
8054 case SADB_EXT_SPIRANGE:
8055 case SADB_X_EXT_POLICY:
8056 case SADB_X_EXT_SA2:
8057 case SADB_X_EXT_NAT_T_TYPE:
8058 case SADB_X_EXT_NAT_T_SPORT:
8059 case SADB_X_EXT_NAT_T_DPORT:
8060 case SADB_X_EXT_NAT_T_OAI:
8061 case SADB_X_EXT_NAT_T_OAR:
8062 case SADB_X_EXT_NAT_T_FRAG:
8063 case SADB_X_EXT_SA_REPLAY:
8064 case SADB_X_EXT_NEW_ADDRESS_SRC:
8065 case SADB_X_EXT_NEW_ADDRESS_DST:
8066 /* duplicate check */
8067 /*
8068 * XXX Are there duplication payloads of either
8069 * KEY_AUTH or KEY_ENCRYPT ?
8070 */
8071 if (mhp->ext[ext->sadb_ext_type] != NULL) {
8072 ipseclog((LOG_DEBUG, "%s: duplicate ext_type "
8073 "%u\n", __func__, ext->sadb_ext_type));
8074 m_freem(m);
8075 PFKEYSTAT_INC(out_dupext);
8076 return EINVAL;
8077 }
8078 break;
8079 default:
8080 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n",
8081 __func__, ext->sadb_ext_type));
8082 m_freem(m);
8083 PFKEYSTAT_INC(out_invexttype);
8084 return EINVAL;
8085 }
8086
8087 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
8088
8089 if (key_validate_ext(ext, extlen)) {
8090 m_freem(m);
8091 PFKEYSTAT_INC(out_invlen);
8092 return EINVAL;
8093 }
8094
8095 n = m_pulldown(m, off, extlen, &toff);
8096 if (!n) {
8097 /* m is already freed */
8098 return ENOBUFS;
8099 }
8100 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
8101
8102 mhp->ext[ext->sadb_ext_type] = ext;
8103 mhp->extoff[ext->sadb_ext_type] = off;
8104 mhp->extlen[ext->sadb_ext_type] = extlen;
8105 }
8106
8107 if (off != end) {
8108 m_freem(m);
8109 PFKEYSTAT_INC(out_invlen);
8110 return EINVAL;
8111 }
8112
8113 return 0;
8114 }
8115
8116 static int
key_validate_ext(const struct sadb_ext * ext,int len)8117 key_validate_ext(const struct sadb_ext *ext, int len)
8118 {
8119 const struct sockaddr *sa;
8120 enum { NONE, ADDR } checktype = NONE;
8121 int baselen = 0;
8122 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len);
8123
8124 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len))
8125 return EINVAL;
8126
8127 /* if it does not match minimum/maximum length, bail */
8128 if (ext->sadb_ext_type >= nitems(minsize) ||
8129 ext->sadb_ext_type >= nitems(maxsize))
8130 return EINVAL;
8131 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type])
8132 return EINVAL;
8133 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type])
8134 return EINVAL;
8135
8136 /* more checks based on sadb_ext_type XXX need more */
8137 switch (ext->sadb_ext_type) {
8138 case SADB_EXT_ADDRESS_SRC:
8139 case SADB_EXT_ADDRESS_DST:
8140 case SADB_EXT_ADDRESS_PROXY:
8141 case SADB_X_EXT_NAT_T_OAI:
8142 case SADB_X_EXT_NAT_T_OAR:
8143 case SADB_X_EXT_NEW_ADDRESS_SRC:
8144 case SADB_X_EXT_NEW_ADDRESS_DST:
8145 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
8146 checktype = ADDR;
8147 break;
8148 case SADB_EXT_IDENTITY_SRC:
8149 case SADB_EXT_IDENTITY_DST:
8150 if (((const struct sadb_ident *)ext)->sadb_ident_type ==
8151 SADB_X_IDENTTYPE_ADDR) {
8152 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident));
8153 checktype = ADDR;
8154 } else
8155 checktype = NONE;
8156 break;
8157 default:
8158 checktype = NONE;
8159 break;
8160 }
8161
8162 switch (checktype) {
8163 case NONE:
8164 break;
8165 case ADDR:
8166 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen);
8167 if (len < baselen + sal)
8168 return EINVAL;
8169 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len)
8170 return EINVAL;
8171 break;
8172 }
8173
8174 return 0;
8175 }
8176
8177 void
spdcache_init(void)8178 spdcache_init(void)
8179 {
8180 int i;
8181
8182 TUNABLE_INT_FETCH("net.key.spdcache.maxentries",
8183 &V_key_spdcache_maxentries);
8184 TUNABLE_INT_FETCH("net.key.spdcache.threshold",
8185 &V_key_spdcache_threshold);
8186
8187 if (V_key_spdcache_maxentries) {
8188 V_key_spdcache_maxentries = MAX(V_key_spdcache_maxentries,
8189 SPDCACHE_MAX_ENTRIES_PER_HASH);
8190 V_spdcachehashtbl = hashinit(V_key_spdcache_maxentries /
8191 SPDCACHE_MAX_ENTRIES_PER_HASH,
8192 M_IPSEC_SPDCACHE, &V_spdcachehash_mask);
8193 V_key_spdcache_maxentries = (V_spdcachehash_mask + 1)
8194 * SPDCACHE_MAX_ENTRIES_PER_HASH;
8195
8196 V_spdcache_lock = malloc(sizeof(struct mtx) *
8197 (V_spdcachehash_mask + 1),
8198 M_IPSEC_SPDCACHE, M_WAITOK|M_ZERO);
8199
8200 for (i = 0; i < V_spdcachehash_mask + 1; ++i)
8201 SPDCACHE_LOCK_INIT(i);
8202 }
8203 }
8204
8205 struct spdcache_entry *
spdcache_entry_alloc(const struct secpolicyindex * spidx,struct secpolicy * sp)8206 spdcache_entry_alloc(const struct secpolicyindex *spidx, struct secpolicy *sp)
8207 {
8208 struct spdcache_entry *entry;
8209
8210 entry = malloc(sizeof(struct spdcache_entry),
8211 M_IPSEC_SPDCACHE, M_NOWAIT|M_ZERO);
8212 if (entry == NULL)
8213 return NULL;
8214
8215 if (sp != NULL)
8216 SP_ADDREF(sp);
8217
8218 entry->spidx = *spidx;
8219 entry->sp = sp;
8220
8221 return (entry);
8222 }
8223
8224 void
spdcache_entry_free(struct spdcache_entry * entry)8225 spdcache_entry_free(struct spdcache_entry *entry)
8226 {
8227
8228 if (entry->sp != NULL)
8229 key_freesp(&entry->sp);
8230 free(entry, M_IPSEC_SPDCACHE);
8231 }
8232
8233 void
spdcache_clear(void)8234 spdcache_clear(void)
8235 {
8236 struct spdcache_entry *entry;
8237 int i;
8238
8239 for (i = 0; i < V_spdcachehash_mask + 1; ++i) {
8240 SPDCACHE_LOCK(i);
8241 while (!LIST_EMPTY(&V_spdcachehashtbl[i])) {
8242 entry = LIST_FIRST(&V_spdcachehashtbl[i]);
8243 LIST_REMOVE(entry, chain);
8244 spdcache_entry_free(entry);
8245 }
8246 SPDCACHE_UNLOCK(i);
8247 }
8248 }
8249
8250 #ifdef VIMAGE
8251 void
spdcache_destroy(void)8252 spdcache_destroy(void)
8253 {
8254 int i;
8255
8256 if (SPDCACHE_ENABLED()) {
8257 spdcache_clear();
8258 hashdestroy(V_spdcachehashtbl, M_IPSEC_SPDCACHE, V_spdcachehash_mask);
8259
8260 for (i = 0; i < V_spdcachehash_mask + 1; ++i)
8261 SPDCACHE_LOCK_DESTROY(i);
8262
8263 free(V_spdcache_lock, M_IPSEC_SPDCACHE);
8264 }
8265 }
8266 #endif
8267 void
key_init(void)8268 key_init(void)
8269 {
8270 int i;
8271
8272 for (i = 0; i < IPSEC_DIR_MAX; i++) {
8273 TAILQ_INIT(&V_sptree[i]);
8274 TAILQ_INIT(&V_sptree_ifnet[i]);
8275 }
8276
8277 V_key_lft_zone = uma_zcreate("IPsec SA lft_c",
8278 sizeof(uint64_t) * 2, NULL, NULL, NULL, NULL,
8279 UMA_ALIGN_PTR, UMA_ZONE_PCPU);
8280
8281 TAILQ_INIT(&V_sahtree);
8282 V_sphashtbl = hashinit(SPHASH_NHASH, M_IPSEC_SP, &V_sphash_mask);
8283 V_savhashtbl = hashinit(SAVHASH_NHASH, M_IPSEC_SA, &V_savhash_mask);
8284 V_sahaddrhashtbl = hashinit(SAHHASH_NHASH, M_IPSEC_SAH,
8285 &V_sahaddrhash_mask);
8286 V_acqaddrhashtbl = hashinit(ACQHASH_NHASH, M_IPSEC_SAQ,
8287 &V_acqaddrhash_mask);
8288 V_acqseqhashtbl = hashinit(ACQHASH_NHASH, M_IPSEC_SAQ,
8289 &V_acqseqhash_mask);
8290
8291 spdcache_init();
8292
8293 for (i = 0; i <= SADB_SATYPE_MAX; i++)
8294 LIST_INIT(&V_regtree[i]);
8295
8296 LIST_INIT(&V_acqtree);
8297 LIST_INIT(&V_spacqtree);
8298
8299 if (!IS_DEFAULT_VNET(curvnet))
8300 return;
8301
8302 SPTREE_LOCK_INIT();
8303 REGTREE_LOCK_INIT();
8304 SAHTREE_LOCK_INIT();
8305 ACQ_LOCK_INIT();
8306 SPACQ_LOCK_INIT();
8307
8308 #ifndef IPSEC_DEBUG2
8309 callout_init(&key_timer, 1);
8310 callout_reset(&key_timer, hz, key_timehandler, NULL);
8311 #endif /*IPSEC_DEBUG2*/
8312
8313 /* initialize key statistics */
8314 keystat.getspi_count = 1;
8315
8316 if (bootverbose)
8317 printf("IPsec: Initialized Security Association Processing.\n");
8318 }
8319
8320 #ifdef VIMAGE
8321 void
key_destroy(void)8322 key_destroy(void)
8323 {
8324 struct secashead_queue sahdrainq;
8325 struct secpolicy_queue drainq;
8326 struct secpolicy *sp, *nextsp;
8327 struct secacq *acq, *nextacq;
8328 struct secspacq *spacq, *nextspacq;
8329 struct secashead *sah;
8330 struct secasvar *sav;
8331 struct secreg *reg;
8332 int i;
8333
8334 /*
8335 * XXX: can we just call free() for each object without
8336 * walking through safe way with releasing references?
8337 */
8338 TAILQ_INIT(&drainq);
8339 SPTREE_WLOCK();
8340 for (i = 0; i < IPSEC_DIR_MAX; i++) {
8341 TAILQ_CONCAT(&drainq, &V_sptree[i], chain);
8342 TAILQ_CONCAT(&drainq, &V_sptree_ifnet[i], chain);
8343 }
8344 for (i = 0; i < V_sphash_mask + 1; i++)
8345 LIST_INIT(&V_sphashtbl[i]);
8346 SPTREE_WUNLOCK();
8347 spdcache_destroy();
8348
8349 sp = TAILQ_FIRST(&drainq);
8350 while (sp != NULL) {
8351 nextsp = TAILQ_NEXT(sp, chain);
8352 key_freesp(&sp);
8353 sp = nextsp;
8354 }
8355
8356 TAILQ_INIT(&sahdrainq);
8357 SAHTREE_WLOCK();
8358 TAILQ_CONCAT(&sahdrainq, &V_sahtree, chain);
8359 for (i = 0; i < V_savhash_mask + 1; i++)
8360 LIST_INIT(&V_savhashtbl[i]);
8361 for (i = 0; i < V_sahaddrhash_mask + 1; i++)
8362 LIST_INIT(&V_sahaddrhashtbl[i]);
8363 TAILQ_FOREACH(sah, &sahdrainq, chain) {
8364 sah->state = SADB_SASTATE_DEAD;
8365 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
8366 sav->state = SADB_SASTATE_DEAD;
8367 }
8368 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
8369 sav->state = SADB_SASTATE_DEAD;
8370 }
8371 }
8372 SAHTREE_WUNLOCK();
8373
8374 key_freesah_flushed(&sahdrainq);
8375 hashdestroy(V_sphashtbl, M_IPSEC_SP, V_sphash_mask);
8376 hashdestroy(V_savhashtbl, M_IPSEC_SA, V_savhash_mask);
8377 hashdestroy(V_sahaddrhashtbl, M_IPSEC_SAH, V_sahaddrhash_mask);
8378
8379 REGTREE_LOCK();
8380 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
8381 LIST_FOREACH(reg, &V_regtree[i], chain) {
8382 if (__LIST_CHAINED(reg)) {
8383 LIST_REMOVE(reg, chain);
8384 free(reg, M_IPSEC_SAR);
8385 break;
8386 }
8387 }
8388 }
8389 REGTREE_UNLOCK();
8390
8391 ACQ_LOCK();
8392 acq = LIST_FIRST(&V_acqtree);
8393 while (acq != NULL) {
8394 nextacq = LIST_NEXT(acq, chain);
8395 LIST_REMOVE(acq, chain);
8396 free(acq, M_IPSEC_SAQ);
8397 acq = nextacq;
8398 }
8399 for (i = 0; i < V_acqaddrhash_mask + 1; i++)
8400 LIST_INIT(&V_acqaddrhashtbl[i]);
8401 for (i = 0; i < V_acqseqhash_mask + 1; i++)
8402 LIST_INIT(&V_acqseqhashtbl[i]);
8403 ACQ_UNLOCK();
8404
8405 SPACQ_LOCK();
8406 for (spacq = LIST_FIRST(&V_spacqtree); spacq != NULL;
8407 spacq = nextspacq) {
8408 nextspacq = LIST_NEXT(spacq, chain);
8409 if (__LIST_CHAINED(spacq)) {
8410 LIST_REMOVE(spacq, chain);
8411 free(spacq, M_IPSEC_SAQ);
8412 }
8413 }
8414 SPACQ_UNLOCK();
8415 hashdestroy(V_acqaddrhashtbl, M_IPSEC_SAQ, V_acqaddrhash_mask);
8416 hashdestroy(V_acqseqhashtbl, M_IPSEC_SAQ, V_acqseqhash_mask);
8417 uma_zdestroy(V_key_lft_zone);
8418
8419 if (!IS_DEFAULT_VNET(curvnet))
8420 return;
8421 #ifndef IPSEC_DEBUG2
8422 callout_drain(&key_timer);
8423 #endif
8424 SPTREE_LOCK_DESTROY();
8425 REGTREE_LOCK_DESTROY();
8426 SAHTREE_LOCK_DESTROY();
8427 ACQ_LOCK_DESTROY();
8428 SPACQ_LOCK_DESTROY();
8429 }
8430 #endif
8431
8432 /* record data transfer on SA, and update timestamps */
8433 void
key_sa_recordxfer(struct secasvar * sav,struct mbuf * m)8434 key_sa_recordxfer(struct secasvar *sav, struct mbuf *m)
8435 {
8436 IPSEC_ASSERT(sav != NULL, ("Null secasvar"));
8437 IPSEC_ASSERT(m != NULL, ("Null mbuf"));
8438
8439 /*
8440 * XXX Currently, there is a difference of bytes size
8441 * between inbound and outbound processing.
8442 */
8443 counter_u64_add(sav->lft_c_bytes, m->m_pkthdr.len);
8444
8445 /*
8446 * We use the number of packets as the unit of
8447 * allocations. We increment the variable
8448 * whenever {esp,ah}_{in,out}put is called.
8449 */
8450 counter_u64_add(sav->lft_c_allocations, 1);
8451
8452 /*
8453 * NOTE: We record CURRENT usetime by using wall clock,
8454 * in seconds. HARD and SOFT lifetime are measured by the time
8455 * difference (again in seconds) from usetime.
8456 *
8457 * usetime
8458 * v expire expire
8459 * -----+-----+--------+---> t
8460 * <--------------> HARD
8461 * <-----> SOFT
8462 */
8463 if (sav->firstused == 0)
8464 sav->firstused = time_second;
8465 }
8466
8467 /*
8468 * Take one of the kernel's security keys and convert it into a PF_KEY
8469 * structure within an mbuf, suitable for sending up to a waiting
8470 * application in user land.
8471 *
8472 * IN:
8473 * src: A pointer to a kernel security key.
8474 * exttype: Which type of key this is. Refer to the PF_KEY data structures.
8475 * OUT:
8476 * a valid mbuf or NULL indicating an error
8477 *
8478 */
8479
8480 static struct mbuf *
key_setkey(struct seckey * src,uint16_t exttype)8481 key_setkey(struct seckey *src, uint16_t exttype)
8482 {
8483 struct mbuf *m;
8484 struct sadb_key *p;
8485 int len;
8486
8487 if (src == NULL)
8488 return NULL;
8489
8490 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src));
8491 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
8492 if (m == NULL)
8493 return NULL;
8494 m_align(m, len);
8495 m->m_len = len;
8496 p = mtod(m, struct sadb_key *);
8497 bzero(p, len);
8498 p->sadb_key_len = PFKEY_UNIT64(len);
8499 p->sadb_key_exttype = exttype;
8500 p->sadb_key_bits = src->bits;
8501 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src));
8502
8503 return m;
8504 }
8505
8506 /*
8507 * Take one of the kernel's lifetime data structures and convert it
8508 * into a PF_KEY structure within an mbuf, suitable for sending up to
8509 * a waiting application in user land.
8510 *
8511 * IN:
8512 * src: A pointer to a kernel lifetime structure.
8513 * exttype: Which type of lifetime this is. Refer to the PF_KEY
8514 * data structures for more information.
8515 * OUT:
8516 * a valid mbuf or NULL indicating an error
8517 *
8518 */
8519
8520 static struct mbuf *
key_setlifetime(struct seclifetime * src,uint16_t exttype)8521 key_setlifetime(struct seclifetime *src, uint16_t exttype)
8522 {
8523 struct mbuf *m = NULL;
8524 struct sadb_lifetime *p;
8525 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime));
8526
8527 if (src == NULL)
8528 return NULL;
8529
8530 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
8531 if (m == NULL)
8532 return m;
8533 m_align(m, len);
8534 m->m_len = len;
8535 p = mtod(m, struct sadb_lifetime *);
8536
8537 bzero(p, len);
8538 p->sadb_lifetime_len = PFKEY_UNIT64(len);
8539 p->sadb_lifetime_exttype = exttype;
8540 p->sadb_lifetime_allocations = src->allocations;
8541 p->sadb_lifetime_bytes = src->bytes;
8542 p->sadb_lifetime_addtime = src->addtime;
8543 p->sadb_lifetime_usetime = src->usetime;
8544
8545 return m;
8546
8547 }
8548
8549 const struct enc_xform *
enc_algorithm_lookup(int alg)8550 enc_algorithm_lookup(int alg)
8551 {
8552 int i;
8553
8554 for (i = 0; i < nitems(supported_ealgs); i++)
8555 if (alg == supported_ealgs[i].sadb_alg)
8556 return (supported_ealgs[i].xform);
8557 return (NULL);
8558 }
8559
8560 const struct auth_hash *
auth_algorithm_lookup(int alg)8561 auth_algorithm_lookup(int alg)
8562 {
8563 int i;
8564
8565 for (i = 0; i < nitems(supported_aalgs); i++)
8566 if (alg == supported_aalgs[i].sadb_alg)
8567 return (supported_aalgs[i].xform);
8568 return (NULL);
8569 }
8570
8571 const struct comp_algo *
comp_algorithm_lookup(int alg)8572 comp_algorithm_lookup(int alg)
8573 {
8574 int i;
8575
8576 for (i = 0; i < nitems(supported_calgs); i++)
8577 if (alg == supported_calgs[i].sadb_alg)
8578 return (supported_calgs[i].xform);
8579 return (NULL);
8580 }
8581