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
69 #include <netinet/in.h>
70 #include <netinet/in_systm.h>
71 #include <netinet/ip.h>
72 #include <netinet/in_var.h>
73 #include <netinet/udp.h>
74
75 #ifdef INET6
76 #include <netinet/ip6.h>
77 #include <netinet6/in6_var.h>
78 #include <netinet6/ip6_var.h>
79 #endif /* INET6 */
80
81 #include <net/pfkeyv2.h>
82 #include <netipsec/keydb.h>
83 #include <netipsec/key.h>
84 #include <netipsec/keysock.h>
85 #include <netipsec/key_debug.h>
86
87 #include <netipsec/ipsec.h>
88 #ifdef INET6
89 #include <netipsec/ipsec6.h>
90 #endif
91
92 #include <netipsec/xform.h>
93 #include <machine/in_cksum.h>
94 #include <machine/stdarg.h>
95
96 /* randomness */
97 #include <sys/random.h>
98
99 #define FULLMASK 0xff
100 #define _BITS(bytes) ((bytes) << 3)
101
102 #define UINT32_80PCT 0xcccccccc
103 /*
104 * Note on SA reference counting:
105 * - SAs that are not in DEAD state will have (total external reference + 1)
106 * following value in reference count field. they cannot be freed and are
107 * referenced from SA header.
108 * - SAs that are in DEAD state will have (total external reference)
109 * in reference count field. they are ready to be freed. reference from
110 * SA header will be removed in key_delsav(), when the reference count
111 * field hits 0 (= no external reference other than from SA header.
112 */
113
114 VNET_DEFINE(u_int32_t, key_debug_level) = 0;
115 VNET_DEFINE_STATIC(u_int, key_spi_trycnt) = 1000;
116 VNET_DEFINE_STATIC(u_int32_t, key_spi_minval) = 0x100;
117 VNET_DEFINE_STATIC(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */
118 VNET_DEFINE_STATIC(u_int32_t, policy_id) = 0;
119 /*interval to initialize randseed,1(m)*/
120 VNET_DEFINE_STATIC(u_int, key_int_random) = 60;
121 /* interval to expire acquiring, 30(s)*/
122 VNET_DEFINE_STATIC(u_int, key_larval_lifetime) = 30;
123 /* counter for blocking SADB_ACQUIRE.*/
124 VNET_DEFINE_STATIC(int, key_blockacq_count) = 10;
125 /* lifetime for blocking SADB_ACQUIRE.*/
126 VNET_DEFINE_STATIC(int, key_blockacq_lifetime) = 20;
127 /* preferred old sa rather than new sa.*/
128 VNET_DEFINE_STATIC(int, key_preferred_oldsa) = 1;
129 #define V_key_spi_trycnt VNET(key_spi_trycnt)
130 #define V_key_spi_minval VNET(key_spi_minval)
131 #define V_key_spi_maxval VNET(key_spi_maxval)
132 #define V_policy_id VNET(policy_id)
133 #define V_key_int_random VNET(key_int_random)
134 #define V_key_larval_lifetime VNET(key_larval_lifetime)
135 #define V_key_blockacq_count VNET(key_blockacq_count)
136 #define V_key_blockacq_lifetime VNET(key_blockacq_lifetime)
137 #define V_key_preferred_oldsa VNET(key_preferred_oldsa)
138
139 VNET_DEFINE_STATIC(u_int32_t, acq_seq) = 0;
140 #define V_acq_seq VNET(acq_seq)
141
142 VNET_DEFINE_STATIC(uint32_t, sp_genid) = 0;
143 #define V_sp_genid VNET(sp_genid)
144
145 /* SPD */
146 TAILQ_HEAD(secpolicy_queue, secpolicy);
147 LIST_HEAD(secpolicy_list, secpolicy);
148 VNET_DEFINE_STATIC(struct secpolicy_queue, sptree[IPSEC_DIR_MAX]);
149 VNET_DEFINE_STATIC(struct secpolicy_queue, sptree_ifnet[IPSEC_DIR_MAX]);
150 static struct rmlock sptree_lock;
151 #define V_sptree VNET(sptree)
152 #define V_sptree_ifnet VNET(sptree_ifnet)
153 #define SPTREE_LOCK_INIT() rm_init(&sptree_lock, "sptree")
154 #define SPTREE_LOCK_DESTROY() rm_destroy(&sptree_lock)
155 #define SPTREE_RLOCK_TRACKER struct rm_priotracker sptree_tracker
156 #define SPTREE_RLOCK() rm_rlock(&sptree_lock, &sptree_tracker)
157 #define SPTREE_RUNLOCK() rm_runlock(&sptree_lock, &sptree_tracker)
158 #define SPTREE_RLOCK_ASSERT() rm_assert(&sptree_lock, RA_RLOCKED)
159 #define SPTREE_WLOCK() rm_wlock(&sptree_lock)
160 #define SPTREE_WUNLOCK() rm_wunlock(&sptree_lock)
161 #define SPTREE_WLOCK_ASSERT() rm_assert(&sptree_lock, RA_WLOCKED)
162 #define SPTREE_UNLOCK_ASSERT() rm_assert(&sptree_lock, RA_UNLOCKED)
163
164 /* Hash table for lookup SP using unique id */
165 VNET_DEFINE_STATIC(struct secpolicy_list *, sphashtbl);
166 VNET_DEFINE_STATIC(u_long, sphash_mask);
167 #define V_sphashtbl VNET(sphashtbl)
168 #define V_sphash_mask VNET(sphash_mask)
169
170 #define SPHASH_NHASH_LOG2 7
171 #define SPHASH_NHASH (1 << SPHASH_NHASH_LOG2)
172 #define SPHASH_HASHVAL(id) (key_u32hash(id) & V_sphash_mask)
173 #define SPHASH_HASH(id) &V_sphashtbl[SPHASH_HASHVAL(id)]
174
175 /* SPD cache */
176 struct spdcache_entry {
177 struct secpolicyindex spidx; /* secpolicyindex */
178 struct secpolicy *sp; /* cached policy to be used */
179
180 LIST_ENTRY(spdcache_entry) chain;
181 };
182 LIST_HEAD(spdcache_entry_list, spdcache_entry);
183
184 #define SPDCACHE_MAX_ENTRIES_PER_HASH 8
185
186 VNET_DEFINE_STATIC(u_int, key_spdcache_maxentries) = 0;
187 #define V_key_spdcache_maxentries VNET(key_spdcache_maxentries)
188 VNET_DEFINE_STATIC(u_int, key_spdcache_threshold) = 32;
189 #define V_key_spdcache_threshold VNET(key_spdcache_threshold)
190 VNET_DEFINE_STATIC(unsigned long, spd_size) = 0;
191 #define V_spd_size VNET(spd_size)
192
193 #define SPDCACHE_ENABLED() (V_key_spdcache_maxentries != 0)
194 #define SPDCACHE_ACTIVE() \
195 (SPDCACHE_ENABLED() && V_spd_size >= V_key_spdcache_threshold)
196
197 VNET_DEFINE_STATIC(struct spdcache_entry_list *, spdcachehashtbl);
198 VNET_DEFINE_STATIC(u_long, spdcachehash_mask);
199 #define V_spdcachehashtbl VNET(spdcachehashtbl)
200 #define V_spdcachehash_mask VNET(spdcachehash_mask)
201
202 #define SPDCACHE_HASHVAL(idx) \
203 (key_addrprotohash(&(idx)->src, &(idx)->dst, &(idx)->ul_proto) & \
204 V_spdcachehash_mask)
205
206 /* Each cache line is protected by a mutex */
207 VNET_DEFINE_STATIC(struct mtx *, spdcache_lock);
208 #define V_spdcache_lock VNET(spdcache_lock)
209
210 #define SPDCACHE_LOCK_INIT(a) \
211 mtx_init(&V_spdcache_lock[a], "spdcache", \
212 "fast ipsec SPD cache", MTX_DEF|MTX_DUPOK)
213 #define SPDCACHE_LOCK_DESTROY(a) mtx_destroy(&V_spdcache_lock[a])
214 #define SPDCACHE_LOCK(a) mtx_lock(&V_spdcache_lock[a]);
215 #define SPDCACHE_UNLOCK(a) mtx_unlock(&V_spdcache_lock[a]);
216
217 static struct sx spi_alloc_lock;
218 #define SPI_ALLOC_LOCK_INIT() sx_init(&spi_alloc_lock, "spialloc")
219 #define SPI_ALLOC_LOCK_DESTROY() sx_destroy(&spi_alloc_lock)
220 #define SPI_ALLOC_LOCK() sx_xlock(&spi_alloc_lock)
221 #define SPI_ALLOC_UNLOCK() sx_unlock(&spi_alloc_lock)
222 #define SPI_ALLOC_LOCK_ASSERT() sx_assert(&spi_alloc_lock, SA_XLOCKED)
223
224 /* SAD */
225 TAILQ_HEAD(secashead_queue, secashead);
226 LIST_HEAD(secashead_list, secashead);
227 VNET_DEFINE_STATIC(struct secashead_queue, sahtree);
228 static struct rmlock sahtree_lock;
229 #define V_sahtree VNET(sahtree)
230 #define SAHTREE_LOCK_INIT() rm_init(&sahtree_lock, "sahtree")
231 #define SAHTREE_LOCK_DESTROY() rm_destroy(&sahtree_lock)
232 #define SAHTREE_RLOCK_TRACKER struct rm_priotracker sahtree_tracker
233 #define SAHTREE_RLOCK() rm_rlock(&sahtree_lock, &sahtree_tracker)
234 #define SAHTREE_RUNLOCK() rm_runlock(&sahtree_lock, &sahtree_tracker)
235 #define SAHTREE_RLOCK_ASSERT() rm_assert(&sahtree_lock, RA_RLOCKED)
236 #define SAHTREE_WLOCK() rm_wlock(&sahtree_lock)
237 #define SAHTREE_WUNLOCK() rm_wunlock(&sahtree_lock)
238 #define SAHTREE_WLOCK_ASSERT() rm_assert(&sahtree_lock, RA_WLOCKED)
239 #define SAHTREE_UNLOCK_ASSERT() rm_assert(&sahtree_lock, RA_UNLOCKED)
240
241 /* Hash table for lookup in SAD using SA addresses */
242 VNET_DEFINE_STATIC(struct secashead_list *, sahaddrhashtbl);
243 VNET_DEFINE_STATIC(u_long, sahaddrhash_mask);
244 #define V_sahaddrhashtbl VNET(sahaddrhashtbl)
245 #define V_sahaddrhash_mask VNET(sahaddrhash_mask)
246
247 #define SAHHASH_NHASH_LOG2 7
248 #define SAHHASH_NHASH (1 << SAHHASH_NHASH_LOG2)
249 #define SAHADDRHASH_HASHVAL(idx) \
250 (key_addrprotohash(&(idx)->src, &(idx)->dst, &(idx)->proto) & \
251 V_sahaddrhash_mask)
252 #define SAHADDRHASH_HASH(saidx) \
253 &V_sahaddrhashtbl[SAHADDRHASH_HASHVAL(saidx)]
254
255 /* Hash table for lookup in SAD using SPI */
256 LIST_HEAD(secasvar_list, secasvar);
257 VNET_DEFINE_STATIC(struct secasvar_list *, savhashtbl);
258 VNET_DEFINE_STATIC(u_long, savhash_mask);
259 #define V_savhashtbl VNET(savhashtbl)
260 #define V_savhash_mask VNET(savhash_mask)
261 #define SAVHASH_NHASH_LOG2 7
262 #define SAVHASH_NHASH (1 << SAVHASH_NHASH_LOG2)
263 #define SAVHASH_HASHVAL(spi) (key_u32hash(spi) & V_savhash_mask)
264 #define SAVHASH_HASH(spi) &V_savhashtbl[SAVHASH_HASHVAL(spi)]
265
266 static uint32_t
key_addrprotohash(const union sockaddr_union * src,const union sockaddr_union * dst,const uint8_t * proto)267 key_addrprotohash(const union sockaddr_union *src,
268 const union sockaddr_union *dst, const uint8_t *proto)
269 {
270 uint32_t hval;
271
272 hval = fnv_32_buf(proto, sizeof(*proto),
273 FNV1_32_INIT);
274 switch (dst->sa.sa_family) {
275 #ifdef INET
276 case AF_INET:
277 hval = fnv_32_buf(&src->sin.sin_addr,
278 sizeof(in_addr_t), hval);
279 hval = fnv_32_buf(&dst->sin.sin_addr,
280 sizeof(in_addr_t), hval);
281 break;
282 #endif
283 #ifdef INET6
284 case AF_INET6:
285 hval = fnv_32_buf(&src->sin6.sin6_addr,
286 sizeof(struct in6_addr), hval);
287 hval = fnv_32_buf(&dst->sin6.sin6_addr,
288 sizeof(struct in6_addr), hval);
289 break;
290 #endif
291 default:
292 hval = 0;
293 ipseclog((LOG_DEBUG, "%s: unknown address family %d\n",
294 __func__, dst->sa.sa_family));
295 }
296 return (hval);
297 }
298
299 static uint32_t
key_u32hash(uint32_t val)300 key_u32hash(uint32_t val)
301 {
302
303 return (fnv_32_buf(&val, sizeof(val), FNV1_32_INIT));
304 }
305
306 /* registed list */
307 VNET_DEFINE_STATIC(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]);
308 #define V_regtree VNET(regtree)
309 static struct mtx regtree_lock;
310 #define REGTREE_LOCK_INIT() \
311 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF)
312 #define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock)
313 #define REGTREE_LOCK() mtx_lock(®tree_lock)
314 #define REGTREE_UNLOCK() mtx_unlock(®tree_lock)
315 #define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED)
316
317 /* Acquiring list */
318 LIST_HEAD(secacq_list, secacq);
319 VNET_DEFINE_STATIC(struct secacq_list, acqtree);
320 #define V_acqtree VNET(acqtree)
321 static struct mtx acq_lock;
322 #define ACQ_LOCK_INIT() \
323 mtx_init(&acq_lock, "acqtree", "ipsec SA acquiring list", MTX_DEF)
324 #define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock)
325 #define ACQ_LOCK() mtx_lock(&acq_lock)
326 #define ACQ_UNLOCK() mtx_unlock(&acq_lock)
327 #define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED)
328
329 /* Hash table for lookup in ACQ list using SA addresses */
330 VNET_DEFINE_STATIC(struct secacq_list *, acqaddrhashtbl);
331 VNET_DEFINE_STATIC(u_long, acqaddrhash_mask);
332 #define V_acqaddrhashtbl VNET(acqaddrhashtbl)
333 #define V_acqaddrhash_mask VNET(acqaddrhash_mask)
334
335 /* Hash table for lookup in ACQ list using SEQ number */
336 VNET_DEFINE_STATIC(struct secacq_list *, acqseqhashtbl);
337 VNET_DEFINE_STATIC(u_long, acqseqhash_mask);
338 #define V_acqseqhashtbl VNET(acqseqhashtbl)
339 #define V_acqseqhash_mask VNET(acqseqhash_mask)
340
341 #define ACQHASH_NHASH_LOG2 7
342 #define ACQHASH_NHASH (1 << ACQHASH_NHASH_LOG2)
343 #define ACQADDRHASH_HASHVAL(idx) \
344 (key_addrprotohash(&(idx)->src, &(idx)->dst, &(idx)->proto) & \
345 V_acqaddrhash_mask)
346 #define ACQSEQHASH_HASHVAL(seq) \
347 (key_u32hash(seq) & V_acqseqhash_mask)
348 #define ACQADDRHASH_HASH(saidx) \
349 &V_acqaddrhashtbl[ACQADDRHASH_HASHVAL(saidx)]
350 #define ACQSEQHASH_HASH(seq) \
351 &V_acqseqhashtbl[ACQSEQHASH_HASHVAL(seq)]
352 /* SP acquiring list */
353 VNET_DEFINE_STATIC(LIST_HEAD(_spacqtree, secspacq), spacqtree);
354 #define V_spacqtree VNET(spacqtree)
355 static struct mtx spacq_lock;
356 #define SPACQ_LOCK_INIT() \
357 mtx_init(&spacq_lock, "spacqtree", \
358 "fast ipsec security policy acquire list", MTX_DEF)
359 #define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock)
360 #define SPACQ_LOCK() mtx_lock(&spacq_lock)
361 #define SPACQ_UNLOCK() mtx_unlock(&spacq_lock)
362 #define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED)
363
364 static const int minsize[] = {
365 [SADB_EXT_RESERVED] = sizeof(struct sadb_msg),
366 [SADB_EXT_SA] = sizeof(struct sadb_sa),
367 [SADB_EXT_LIFETIME_CURRENT] = sizeof(struct sadb_lifetime),
368 [SADB_EXT_LIFETIME_HARD] = sizeof(struct sadb_lifetime),
369 [SADB_EXT_LIFETIME_SOFT] = sizeof(struct sadb_lifetime),
370 [SADB_EXT_ADDRESS_SRC] = sizeof(struct sadb_address),
371 [SADB_EXT_ADDRESS_DST] = sizeof(struct sadb_address),
372 [SADB_EXT_ADDRESS_PROXY] = sizeof(struct sadb_address),
373 [SADB_EXT_KEY_AUTH] = sizeof(struct sadb_key),
374 [SADB_EXT_KEY_ENCRYPT] = sizeof(struct sadb_key),
375 [SADB_EXT_IDENTITY_SRC] = sizeof(struct sadb_ident),
376 [SADB_EXT_IDENTITY_DST] = sizeof(struct sadb_ident),
377 [SADB_EXT_SENSITIVITY] = sizeof(struct sadb_sens),
378 [SADB_EXT_PROPOSAL] = sizeof(struct sadb_prop),
379 [SADB_EXT_SUPPORTED_AUTH] = sizeof(struct sadb_supported),
380 [SADB_EXT_SUPPORTED_ENCRYPT] = sizeof(struct sadb_supported),
381 [SADB_EXT_SPIRANGE] = sizeof(struct sadb_spirange),
382 [SADB_X_EXT_KMPRIVATE] = 0,
383 [SADB_X_EXT_POLICY] = sizeof(struct sadb_x_policy),
384 [SADB_X_EXT_SA2] = sizeof(struct sadb_x_sa2),
385 [SADB_X_EXT_NAT_T_TYPE] = sizeof(struct sadb_x_nat_t_type),
386 [SADB_X_EXT_NAT_T_SPORT] = sizeof(struct sadb_x_nat_t_port),
387 [SADB_X_EXT_NAT_T_DPORT] = sizeof(struct sadb_x_nat_t_port),
388 [SADB_X_EXT_NAT_T_OAI] = sizeof(struct sadb_address),
389 [SADB_X_EXT_NAT_T_OAR] = sizeof(struct sadb_address),
390 [SADB_X_EXT_NAT_T_FRAG] = sizeof(struct sadb_x_nat_t_frag),
391 [SADB_X_EXT_SA_REPLAY] = sizeof(struct sadb_x_sa_replay),
392 [SADB_X_EXT_NEW_ADDRESS_SRC] = sizeof(struct sadb_address),
393 [SADB_X_EXT_NEW_ADDRESS_DST] = sizeof(struct sadb_address),
394 };
395 _Static_assert(nitems(minsize) == SADB_EXT_MAX + 1, "minsize size mismatch");
396
397 static const int maxsize[] = {
398 [SADB_EXT_RESERVED] = sizeof(struct sadb_msg),
399 [SADB_EXT_SA] = sizeof(struct sadb_sa),
400 [SADB_EXT_LIFETIME_CURRENT] = sizeof(struct sadb_lifetime),
401 [SADB_EXT_LIFETIME_HARD] = sizeof(struct sadb_lifetime),
402 [SADB_EXT_LIFETIME_SOFT] = sizeof(struct sadb_lifetime),
403 [SADB_EXT_ADDRESS_SRC] = 0,
404 [SADB_EXT_ADDRESS_DST] = 0,
405 [SADB_EXT_ADDRESS_PROXY] = 0,
406 [SADB_EXT_KEY_AUTH] = 0,
407 [SADB_EXT_KEY_ENCRYPT] = 0,
408 [SADB_EXT_IDENTITY_SRC] = 0,
409 [SADB_EXT_IDENTITY_DST] = 0,
410 [SADB_EXT_SENSITIVITY] = 0,
411 [SADB_EXT_PROPOSAL] = 0,
412 [SADB_EXT_SUPPORTED_AUTH] = 0,
413 [SADB_EXT_SUPPORTED_ENCRYPT] = 0,
414 [SADB_EXT_SPIRANGE] = sizeof(struct sadb_spirange),
415 [SADB_X_EXT_KMPRIVATE] = 0,
416 [SADB_X_EXT_POLICY] = 0,
417 [SADB_X_EXT_SA2] = sizeof(struct sadb_x_sa2),
418 [SADB_X_EXT_NAT_T_TYPE] = sizeof(struct sadb_x_nat_t_type),
419 [SADB_X_EXT_NAT_T_SPORT] = sizeof(struct sadb_x_nat_t_port),
420 [SADB_X_EXT_NAT_T_DPORT] = sizeof(struct sadb_x_nat_t_port),
421 [SADB_X_EXT_NAT_T_OAI] = 0,
422 [SADB_X_EXT_NAT_T_OAR] = 0,
423 [SADB_X_EXT_NAT_T_FRAG] = sizeof(struct sadb_x_nat_t_frag),
424 [SADB_X_EXT_SA_REPLAY] = sizeof(struct sadb_x_sa_replay),
425 [SADB_X_EXT_NEW_ADDRESS_SRC] = 0,
426 [SADB_X_EXT_NEW_ADDRESS_DST] = 0,
427 };
428 _Static_assert(nitems(maxsize) == SADB_EXT_MAX + 1, "maxsize size mismatch");
429
430 /*
431 * Internal values for SA flags:
432 * SADB_X_EXT_F_CLONED means that SA was cloned by key_updateaddresses,
433 * thus we will not free the most of SA content in key_delsav().
434 */
435 #define SADB_X_EXT_F_CLONED 0x80000000
436
437 #define SADB_CHECKLEN(_mhp, _ext) \
438 ((_mhp)->extlen[(_ext)] < minsize[(_ext)] || (maxsize[(_ext)] != 0 && \
439 ((_mhp)->extlen[(_ext)] > maxsize[(_ext)])))
440 #define SADB_CHECKHDR(_mhp, _ext) ((_mhp)->ext[(_ext)] == NULL)
441
442 VNET_DEFINE_STATIC(int, ipsec_esp_keymin) = 256;
443 VNET_DEFINE_STATIC(int, ipsec_esp_auth) = 0;
444 VNET_DEFINE_STATIC(int, ipsec_ah_keymin) = 128;
445
446 #define V_ipsec_esp_keymin VNET(ipsec_esp_keymin)
447 #define V_ipsec_esp_auth VNET(ipsec_esp_auth)
448 #define V_ipsec_ah_keymin VNET(ipsec_ah_keymin)
449
450 #ifdef IPSEC_DEBUG
451 VNET_DEFINE(int, ipsec_debug) = 1;
452 #else
453 VNET_DEFINE(int, ipsec_debug) = 0;
454 #endif
455
456 #ifdef INET
457 SYSCTL_DECL(_net_inet_ipsec);
458 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, debug,
459 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_debug), 0,
460 "Enable IPsec debugging output when set.");
461 #endif
462 #ifdef INET6
463 SYSCTL_DECL(_net_inet6_ipsec6);
464 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, debug,
465 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_debug), 0,
466 "Enable IPsec debugging output when set.");
467 #endif
468
469 SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug,
470 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_debug_level), 0, "");
471
472 /* max count of trial for the decision of spi value */
473 SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt,
474 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_trycnt), 0, "");
475
476 /* minimum spi value to allocate automatically. */
477 SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval,
478 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_minval), 0, "");
479
480 /* maximun spi value to allocate automatically. */
481 SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval,
482 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_maxval), 0, "");
483
484 /* interval to initialize randseed */
485 SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random,
486 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_int_random), 0, "");
487
488 /* lifetime for larval SA */
489 SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime,
490 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_larval_lifetime), 0, "");
491
492 /* counter for blocking to send SADB_ACQUIRE to IKEd */
493 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count,
494 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_count), 0, "");
495
496 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */
497 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime,
498 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, "");
499
500 /* ESP auth */
501 SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth,
502 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, "");
503
504 /* minimum ESP key length */
505 SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin,
506 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, "");
507
508 /* minimum AH key length */
509 SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin,
510 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_ah_keymin), 0, "");
511
512 /* perfered old SA rather than new SA */
513 SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, preferred_oldsa,
514 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_preferred_oldsa), 0, "");
515
516 SYSCTL_NODE(_net_key, OID_AUTO, spdcache, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
517 "SPD cache");
518
519 SYSCTL_UINT(_net_key_spdcache, OID_AUTO, maxentries,
520 CTLFLAG_VNET | CTLFLAG_RDTUN, &VNET_NAME(key_spdcache_maxentries), 0,
521 "Maximum number of entries in the SPD cache"
522 " (power of 2, 0 to disable)");
523
524 SYSCTL_UINT(_net_key_spdcache, OID_AUTO, threshold,
525 CTLFLAG_VNET | CTLFLAG_RDTUN, &VNET_NAME(key_spdcache_threshold), 0,
526 "Number of SPs that make the SPD cache active");
527
528 #define __LIST_CHAINED(elm) \
529 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL))
530
531 MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association");
532 MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head");
533 MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy");
534 MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request");
535 MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous");
536 MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire");
537 MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire");
538 MALLOC_DEFINE(M_IPSEC_SPDCACHE, "ipsec-spdcache", "ipsec SPD cache");
539
540 static uma_zone_t __read_mostly ipsec_key_lft_zone;
541
542 /*
543 * set parameters into secpolicyindex buffer.
544 * Must allocate secpolicyindex buffer passed to this function.
545 */
546 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \
547 do { \
548 bzero((idx), sizeof(struct secpolicyindex)); \
549 (idx)->dir = (_dir); \
550 (idx)->prefs = (ps); \
551 (idx)->prefd = (pd); \
552 (idx)->ul_proto = (ulp); \
553 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
554 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
555 } while (0)
556
557 /*
558 * set parameters into secasindex buffer.
559 * Must allocate secasindex buffer before calling this function.
560 */
561 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \
562 do { \
563 bzero((idx), sizeof(struct secasindex)); \
564 (idx)->proto = (p); \
565 (idx)->mode = (m); \
566 (idx)->reqid = (r); \
567 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
568 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
569 key_porttosaddr(&(idx)->src.sa, 0); \
570 key_porttosaddr(&(idx)->dst.sa, 0); \
571 } while (0)
572
573 /* key statistics */
574 struct _keystat {
575 u_long getspi_count; /* the avarage of count to try to get new SPI */
576 } keystat;
577
578 struct sadb_msghdr {
579 struct sadb_msg *msg;
580 struct sadb_ext *ext[SADB_EXT_MAX + 1];
581 int extoff[SADB_EXT_MAX + 1];
582 int extlen[SADB_EXT_MAX + 1];
583 };
584
585 static const struct supported_ealgs {
586 int sadb_alg;
587 const struct enc_xform *xform;
588 } supported_ealgs[] = {
589 { SADB_X_EALG_AES, &enc_xform_aes_cbc },
590 { SADB_EALG_NULL, &enc_xform_null },
591 { SADB_X_EALG_AESCTR, &enc_xform_aes_icm },
592 { SADB_X_EALG_AESGCM16, &enc_xform_aes_nist_gcm },
593 { SADB_X_EALG_AESGMAC, &enc_xform_aes_nist_gmac },
594 { SADB_X_EALG_CHACHA20POLY1305, &enc_xform_chacha20_poly1305 },
595 };
596
597 static const struct supported_aalgs {
598 int sadb_alg;
599 const struct auth_hash *xform;
600 } supported_aalgs[] = {
601 { SADB_X_AALG_NULL, &auth_hash_null },
602 { SADB_AALG_SHA1HMAC, &auth_hash_hmac_sha1 },
603 { SADB_X_AALG_SHA2_256, &auth_hash_hmac_sha2_256 },
604 { SADB_X_AALG_SHA2_384, &auth_hash_hmac_sha2_384 },
605 { SADB_X_AALG_SHA2_512, &auth_hash_hmac_sha2_512 },
606 { SADB_X_AALG_AES128GMAC, &auth_hash_nist_gmac_aes_128 },
607 { SADB_X_AALG_AES192GMAC, &auth_hash_nist_gmac_aes_192 },
608 { SADB_X_AALG_AES256GMAC, &auth_hash_nist_gmac_aes_256 },
609 { SADB_X_AALG_CHACHA20POLY1305, &auth_hash_poly1305 },
610 };
611
612 static const struct supported_calgs {
613 int sadb_alg;
614 const struct comp_algo *xform;
615 } supported_calgs[] = {
616 { SADB_X_CALG_DEFLATE, &comp_algo_deflate },
617 };
618
619 #ifndef IPSEC_DEBUG2
620 static struct callout key_timer;
621 #endif
622
623 static void key_unlink(struct secpolicy *);
624 static void key_detach(struct secpolicy *);
625 static struct secpolicy *key_do_allocsp(struct secpolicyindex *spidx, u_int dir);
626 static struct secpolicy *key_getsp(struct secpolicyindex *);
627 static struct secpolicy *key_getspbyid(u_int32_t);
628 static struct mbuf *key_gather_mbuf(struct mbuf *,
629 const struct sadb_msghdr *, int, int, ...);
630 static int key_spdadd(struct socket *, struct mbuf *,
631 const struct sadb_msghdr *);
632 static uint32_t key_getnewspid(void);
633 static int key_spddelete(struct socket *, struct mbuf *,
634 const struct sadb_msghdr *);
635 static int key_spddelete2(struct socket *, struct mbuf *,
636 const struct sadb_msghdr *);
637 static int key_spdget(struct socket *, struct mbuf *,
638 const struct sadb_msghdr *);
639 static int key_spdflush(struct socket *, struct mbuf *,
640 const struct sadb_msghdr *);
641 static int key_spddump(struct socket *, struct mbuf *,
642 const struct sadb_msghdr *);
643 static struct mbuf *key_setdumpsp(struct secpolicy *,
644 u_int8_t, u_int32_t, u_int32_t);
645 static struct mbuf *key_sp2mbuf(struct secpolicy *);
646 static size_t key_getspreqmsglen(struct secpolicy *);
647 static int key_spdexpire(struct secpolicy *);
648 static struct secashead *key_newsah(struct secasindex *);
649 static void key_freesah(struct secashead **);
650 static void key_delsah(struct secashead *);
651 static struct secasvar *key_newsav(const struct sadb_msghdr *,
652 struct secasindex *, uint32_t, int *);
653 static void key_delsav(struct secasvar *);
654 static void key_unlinksav(struct secasvar *);
655 static struct secashead *key_getsah(struct secasindex *);
656 static int key_checkspidup(uint32_t);
657 static struct secasvar *key_getsavbyspi(uint32_t);
658 static int key_setnatt(struct secasvar *, const struct sadb_msghdr *);
659 static int key_setsaval(struct secasvar *, const struct sadb_msghdr *);
660 static int key_updatelifetimes(struct secasvar *, const struct sadb_msghdr *);
661 static int key_updateaddresses(struct socket *, struct mbuf *,
662 const struct sadb_msghdr *, struct secasvar *, struct secasindex *);
663
664 static struct mbuf *key_setdumpsa(struct secasvar *, u_int8_t,
665 u_int8_t, u_int32_t, u_int32_t);
666 static struct mbuf *key_setsadbmsg(u_int8_t, u_int16_t, u_int8_t,
667 u_int32_t, pid_t, u_int16_t);
668 static struct mbuf *key_setsadbsa(struct secasvar *);
669 static struct mbuf *key_setsadbaddr(u_int16_t,
670 const struct sockaddr *, u_int8_t, u_int16_t);
671 static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t);
672 static struct mbuf *key_setsadbxtype(u_int16_t);
673 static struct mbuf *key_setsadbxsa2(u_int8_t, u_int32_t, u_int32_t);
674 static struct mbuf *key_setsadbxsareplay(u_int32_t);
675 static struct mbuf *key_setsadbxpolicy(u_int16_t, u_int8_t,
676 u_int32_t, u_int32_t);
677 static struct seckey *key_dup_keymsg(const struct sadb_key *, size_t,
678 struct malloc_type *);
679 static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src,
680 struct malloc_type *);
681
682 /* flags for key_cmpsaidx() */
683 #define CMP_HEAD 1 /* protocol, addresses. */
684 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */
685 #define CMP_REQID 3 /* additionally HEAD, reaid. */
686 #define CMP_EXACTLY 4 /* all elements. */
687 static int key_cmpsaidx(const struct secasindex *,
688 const struct secasindex *, int);
689 static int key_cmpspidx_exactly(struct secpolicyindex *,
690 struct secpolicyindex *);
691 static int key_cmpspidx_withmask(struct secpolicyindex *,
692 struct secpolicyindex *);
693 static int key_bbcmp(const void *, const void *, u_int);
694 static uint8_t key_satype2proto(uint8_t);
695 static uint8_t key_proto2satype(uint8_t);
696
697 static int key_getspi(struct socket *, struct mbuf *,
698 const struct sadb_msghdr *);
699 static uint32_t key_do_getnewspi(struct sadb_spirange *, struct secasindex *);
700 static int key_update(struct socket *, struct mbuf *,
701 const struct sadb_msghdr *);
702 static int key_add(struct socket *, struct mbuf *,
703 const struct sadb_msghdr *);
704 static int key_setident(struct secashead *, const struct sadb_msghdr *);
705 static struct mbuf *key_getmsgbuf_x1(struct mbuf *,
706 const struct sadb_msghdr *);
707 static int key_delete(struct socket *, struct mbuf *,
708 const struct sadb_msghdr *);
709 static int key_delete_all(struct socket *, struct mbuf *,
710 const struct sadb_msghdr *, struct secasindex *);
711 static int key_get(struct socket *, struct mbuf *,
712 const struct sadb_msghdr *);
713
714 static void key_getcomb_setlifetime(struct sadb_comb *);
715 static struct mbuf *key_getcomb_ealg(void);
716 static struct mbuf *key_getcomb_ah(void);
717 static struct mbuf *key_getcomb_ipcomp(void);
718 static struct mbuf *key_getprop(const struct secasindex *);
719
720 static int key_acquire(const struct secasindex *, struct secpolicy *);
721 static uint32_t key_newacq(const struct secasindex *, int *);
722 static uint32_t key_getacq(const struct secasindex *, int *);
723 static int key_acqdone(const struct secasindex *, uint32_t);
724 static int key_acqreset(uint32_t);
725 static struct secspacq *key_newspacq(struct secpolicyindex *);
726 static struct secspacq *key_getspacq(struct secpolicyindex *);
727 static int key_acquire2(struct socket *, struct mbuf *,
728 const struct sadb_msghdr *);
729 static int key_register(struct socket *, struct mbuf *,
730 const struct sadb_msghdr *);
731 static int key_expire(struct secasvar *, int);
732 static int key_flush(struct socket *, struct mbuf *,
733 const struct sadb_msghdr *);
734 static int key_dump(struct socket *, struct mbuf *,
735 const struct sadb_msghdr *);
736 static int key_promisc(struct socket *, struct mbuf *,
737 const struct sadb_msghdr *);
738 static int key_senderror(struct socket *, struct mbuf *, int);
739 static int key_validate_ext(const struct sadb_ext *, int);
740 static int key_align(struct mbuf *, struct sadb_msghdr *);
741 static struct mbuf *key_setlifetime(struct seclifetime *, uint16_t);
742 static struct mbuf *key_setkey(struct seckey *, uint16_t);
743
744 static void spdcache_init(void);
745 static void spdcache_clear(void);
746 static struct spdcache_entry *spdcache_entry_alloc(
747 const struct secpolicyindex *spidx,
748 struct secpolicy *policy);
749 static void spdcache_entry_free(struct spdcache_entry *entry);
750 #ifdef VIMAGE
751 static void spdcache_destroy(void);
752 #endif
753
754 #define DBG_IPSEC_INITREF(t, p) do { \
755 refcount_init(&(p)->refcnt, 1); \
756 KEYDBG(KEY_STAMP, \
757 printf("%s: Initialize refcnt %s(%p) = %u\n", \
758 __func__, #t, (p), (p)->refcnt)); \
759 } while (0)
760 #define DBG_IPSEC_ADDREF(t, p) do { \
761 refcount_acquire(&(p)->refcnt); \
762 KEYDBG(KEY_STAMP, \
763 printf("%s: Acquire refcnt %s(%p) -> %u\n", \
764 __func__, #t, (p), (p)->refcnt)); \
765 } while (0)
766 #define DBG_IPSEC_DELREF(t, p) do { \
767 KEYDBG(KEY_STAMP, \
768 printf("%s: Release refcnt %s(%p) -> %u\n", \
769 __func__, #t, (p), (p)->refcnt - 1)); \
770 refcount_release(&(p)->refcnt); \
771 } while (0)
772
773 #define IPSEC_INITREF(t, p) refcount_init(&(p)->refcnt, 1)
774 #define IPSEC_ADDREF(t, p) refcount_acquire(&(p)->refcnt)
775 #define IPSEC_DELREF(t, p) refcount_release(&(p)->refcnt)
776
777 #define SP_INITREF(p) IPSEC_INITREF(SP, p)
778 #define SP_ADDREF(p) IPSEC_ADDREF(SP, p)
779 #define SP_DELREF(p) IPSEC_DELREF(SP, p)
780
781 #define SAH_INITREF(p) IPSEC_INITREF(SAH, p)
782 #define SAH_ADDREF(p) IPSEC_ADDREF(SAH, p)
783 #define SAH_DELREF(p) IPSEC_DELREF(SAH, p)
784
785 #define SAV_INITREF(p) IPSEC_INITREF(SAV, p)
786 #define SAV_ADDREF(p) IPSEC_ADDREF(SAV, p)
787 #define SAV_DELREF(p) IPSEC_DELREF(SAV, p)
788
789 /*
790 * Update the refcnt while holding the SPTREE lock.
791 */
792 void
key_addref(struct secpolicy * sp)793 key_addref(struct secpolicy *sp)
794 {
795
796 SP_ADDREF(sp);
797 }
798
799 /*
800 * Return 0 when there are known to be no SP's for the specified
801 * direction. Otherwise return 1. This is used by IPsec code
802 * to optimize performance.
803 */
804 int
key_havesp(u_int dir)805 key_havesp(u_int dir)
806 {
807
808 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
809 ("invalid direction %u", dir));
810 return (TAILQ_FIRST(&V_sptree[dir]) != NULL);
811 }
812
813 int
key_havesp_any(void)814 key_havesp_any(void)
815 {
816
817 return (V_spd_size != 0);
818 }
819
820 /*
821 * Allocate a single mbuf with a buffer of the desired length. The buffer is
822 * pre-zeroed to help ensure that uninitialized pad bytes are not leaked.
823 */
824 static struct mbuf *
key_mget(u_int len)825 key_mget(u_int len)
826 {
827 struct mbuf *m;
828
829 KASSERT(len <= MCLBYTES,
830 ("%s: invalid buffer length %u", __func__, len));
831
832 m = m_get2(len, M_NOWAIT, MT_DATA, M_PKTHDR);
833 if (m == NULL)
834 return (NULL);
835 memset(mtod(m, void *), 0, len);
836 return (m);
837 }
838
839 /* %%% IPsec policy management */
840 /*
841 * Return current SPDB generation.
842 */
843 uint32_t
key_getspgen(void)844 key_getspgen(void)
845 {
846
847 return (V_sp_genid);
848 }
849
850 void
key_bumpspgen(void)851 key_bumpspgen(void)
852 {
853
854 V_sp_genid++;
855 }
856
857 static int
key_checksockaddrs(struct sockaddr * src,struct sockaddr * dst)858 key_checksockaddrs(struct sockaddr *src, struct sockaddr *dst)
859 {
860
861 /* family match */
862 if (src->sa_family != dst->sa_family)
863 return (EINVAL);
864 /* sa_len match */
865 if (src->sa_len != dst->sa_len)
866 return (EINVAL);
867 switch (src->sa_family) {
868 #ifdef INET
869 case AF_INET:
870 if (src->sa_len != sizeof(struct sockaddr_in))
871 return (EINVAL);
872 break;
873 #endif
874 #ifdef INET6
875 case AF_INET6:
876 if (src->sa_len != sizeof(struct sockaddr_in6))
877 return (EINVAL);
878 break;
879 #endif
880 default:
881 return (EAFNOSUPPORT);
882 }
883 return (0);
884 }
885
886 struct secpolicy *
key_do_allocsp(struct secpolicyindex * spidx,u_int dir)887 key_do_allocsp(struct secpolicyindex *spidx, u_int dir)
888 {
889 SPTREE_RLOCK_TRACKER;
890 struct secpolicy *sp;
891
892 IPSEC_ASSERT(spidx != NULL, ("null spidx"));
893 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
894 ("invalid direction %u", dir));
895
896 SPTREE_RLOCK();
897 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
898 if (key_cmpspidx_withmask(&sp->spidx, spidx)) {
899 SP_ADDREF(sp);
900 break;
901 }
902 }
903 SPTREE_RUNLOCK();
904 return (sp);
905 }
906
907 /*
908 * allocating a SP for OUTBOUND or INBOUND packet.
909 * Must call key_freesp() later.
910 * OUT: NULL: not found
911 * others: found and return the pointer.
912 */
913 struct secpolicy *
key_allocsp(struct secpolicyindex * spidx,u_int dir)914 key_allocsp(struct secpolicyindex *spidx, u_int dir)
915 {
916 struct spdcache_entry *entry, *lastentry, *tmpentry;
917 struct secpolicy *sp;
918 uint32_t hashv;
919 time_t ts;
920 int nb_entries;
921
922 if (!SPDCACHE_ACTIVE()) {
923 sp = key_do_allocsp(spidx, dir);
924 goto out;
925 }
926
927 hashv = SPDCACHE_HASHVAL(spidx);
928 SPDCACHE_LOCK(hashv);
929 nb_entries = 0;
930 LIST_FOREACH_SAFE(entry, &V_spdcachehashtbl[hashv], chain, tmpentry) {
931 /* Removed outdated entries */
932 if (entry->sp != NULL &&
933 entry->sp->state == IPSEC_SPSTATE_DEAD) {
934 LIST_REMOVE(entry, chain);
935 spdcache_entry_free(entry);
936 continue;
937 }
938
939 nb_entries++;
940 if (!key_cmpspidx_exactly(&entry->spidx, spidx)) {
941 lastentry = entry;
942 continue;
943 }
944
945 sp = entry->sp;
946 if (entry->sp != NULL)
947 SP_ADDREF(sp);
948
949 /* IPSECSTAT_INC(ips_spdcache_hits); */
950
951 SPDCACHE_UNLOCK(hashv);
952 goto out;
953 }
954
955 /* IPSECSTAT_INC(ips_spdcache_misses); */
956
957 sp = key_do_allocsp(spidx, dir);
958 entry = spdcache_entry_alloc(spidx, sp);
959 if (entry != NULL) {
960 if (nb_entries >= SPDCACHE_MAX_ENTRIES_PER_HASH) {
961 LIST_REMOVE(lastentry, chain);
962 spdcache_entry_free(lastentry);
963 }
964
965 LIST_INSERT_HEAD(&V_spdcachehashtbl[hashv], entry, chain);
966 }
967
968 SPDCACHE_UNLOCK(hashv);
969
970 out:
971 if (sp != NULL) { /* found a SPD entry */
972 ts = time_second;
973 if (__predict_false(sp->lastused != ts))
974 sp->lastused = ts;
975 KEYDBG(IPSEC_STAMP,
976 printf("%s: return SP(%p)\n", __func__, sp));
977 KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
978 } else {
979 KEYDBG(IPSEC_DATA,
980 printf("%s: lookup failed for ", __func__);
981 kdebug_secpolicyindex(spidx, NULL));
982 }
983 return (sp);
984 }
985
986 /*
987 * Allocating an SA entry for an *INBOUND* or *OUTBOUND* TCP packet, signed
988 * or should be signed by MD5 signature.
989 * We don't use key_allocsa() for such lookups, because we don't know SPI.
990 * Unlike ESP and AH protocols, SPI isn't transmitted in the TCP header with
991 * signed packet. We use SADB only as storage for password.
992 * OUT: positive: corresponding SA for given saidx found.
993 * NULL: SA not found
994 */
995 struct secasvar *
key_allocsa_tcpmd5(struct secasindex * saidx)996 key_allocsa_tcpmd5(struct secasindex *saidx)
997 {
998 SAHTREE_RLOCK_TRACKER;
999 struct secashead *sah;
1000 struct secasvar *sav;
1001
1002 IPSEC_ASSERT(saidx->proto == IPPROTO_TCP,
1003 ("unexpected security protocol %u", saidx->proto));
1004 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TCPMD5,
1005 ("unexpected mode %u", saidx->mode));
1006
1007 SAHTREE_RLOCK();
1008 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
1009 KEYDBG(IPSEC_DUMP,
1010 printf("%s: checking SAH\n", __func__);
1011 kdebug_secash(sah, " "));
1012 if (sah->saidx.proto != IPPROTO_TCP)
1013 continue;
1014 if (!key_sockaddrcmp(&saidx->dst.sa, &sah->saidx.dst.sa, 0) &&
1015 !key_sockaddrcmp(&saidx->src.sa, &sah->saidx.src.sa, 0))
1016 break;
1017 }
1018 if (sah != NULL) {
1019 if (V_key_preferred_oldsa)
1020 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
1021 else
1022 sav = TAILQ_FIRST(&sah->savtree_alive);
1023 if (sav != NULL)
1024 SAV_ADDREF(sav);
1025 } else
1026 sav = NULL;
1027 SAHTREE_RUNLOCK();
1028
1029 if (sav != NULL) {
1030 KEYDBG(IPSEC_STAMP,
1031 printf("%s: return SA(%p)\n", __func__, sav));
1032 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1033 } else {
1034 KEYDBG(IPSEC_STAMP,
1035 printf("%s: SA not found\n", __func__));
1036 KEYDBG(IPSEC_DATA, kdebug_secasindex(saidx, NULL));
1037 }
1038 return (sav);
1039 }
1040
1041 /*
1042 * Allocating an SA entry for an *OUTBOUND* packet.
1043 * OUT: positive: corresponding SA for given saidx found.
1044 * NULL: SA not found, but will be acquired, check *error
1045 * for acquiring status.
1046 */
1047 struct secasvar *
key_allocsa_policy(struct secpolicy * sp,const struct secasindex * saidx,int * error)1048 key_allocsa_policy(struct secpolicy *sp, const struct secasindex *saidx,
1049 int *error)
1050 {
1051 SAHTREE_RLOCK_TRACKER;
1052 struct secashead *sah;
1053 struct secasvar *sav;
1054
1055 IPSEC_ASSERT(saidx != NULL, ("null saidx"));
1056 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT ||
1057 saidx->mode == IPSEC_MODE_TUNNEL,
1058 ("unexpected policy %u", saidx->mode));
1059
1060 /*
1061 * We check new SA in the IPsec request because a different
1062 * SA may be involved each time this request is checked, either
1063 * because new SAs are being configured, or this request is
1064 * associated with an unconnected datagram socket, or this request
1065 * is associated with a system default policy.
1066 */
1067 SAHTREE_RLOCK();
1068 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
1069 KEYDBG(IPSEC_DUMP,
1070 printf("%s: checking SAH\n", __func__);
1071 kdebug_secash(sah, " "));
1072 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID))
1073 break;
1074 }
1075 if (sah != NULL) {
1076 /*
1077 * Allocate the oldest SA available according to
1078 * draft-jenkins-ipsec-rekeying-03.
1079 */
1080 if (V_key_preferred_oldsa)
1081 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
1082 else
1083 sav = TAILQ_FIRST(&sah->savtree_alive);
1084 if (sav != NULL)
1085 SAV_ADDREF(sav);
1086 } else
1087 sav = NULL;
1088 SAHTREE_RUNLOCK();
1089
1090 if (sav != NULL) {
1091 *error = 0;
1092 KEYDBG(IPSEC_STAMP,
1093 printf("%s: chosen SA(%p) for SP(%p)\n", __func__,
1094 sav, sp));
1095 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1096 return (sav); /* return referenced SA */
1097 }
1098
1099 /* there is no SA */
1100 *error = key_acquire(saidx, sp);
1101 if ((*error) != 0)
1102 ipseclog((LOG_DEBUG,
1103 "%s: error %d returned from key_acquire()\n",
1104 __func__, *error));
1105 KEYDBG(IPSEC_STAMP,
1106 printf("%s: acquire SA for SP(%p), error %d\n",
1107 __func__, sp, *error));
1108 KEYDBG(IPSEC_DATA, kdebug_secasindex(saidx, NULL));
1109 return (NULL);
1110 }
1111
1112 /*
1113 * allocating a usable SA entry for a *INBOUND* packet.
1114 * Must call key_freesav() later.
1115 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state).
1116 * NULL: not found, or error occurred.
1117 *
1118 * According to RFC 2401 SA is uniquely identified by a triple SPI,
1119 * destination address, and security protocol. But according to RFC 4301,
1120 * SPI by itself suffices to specify an SA.
1121 *
1122 * Note that, however, we do need to keep source address in IPsec SA.
1123 * IKE specification and PF_KEY specification do assume that we
1124 * keep source address in IPsec SA. We see a tricky situation here.
1125 */
1126 struct secasvar *
key_allocsa(union sockaddr_union * dst,uint8_t proto,uint32_t spi)1127 key_allocsa(union sockaddr_union *dst, uint8_t proto, uint32_t spi)
1128 {
1129 SAHTREE_RLOCK_TRACKER;
1130 struct secasvar *sav;
1131
1132 IPSEC_ASSERT(proto == IPPROTO_ESP || proto == IPPROTO_AH ||
1133 proto == IPPROTO_IPCOMP, ("unexpected security protocol %u",
1134 proto));
1135
1136 SAHTREE_RLOCK();
1137 LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
1138 if (sav->spi == spi)
1139 break;
1140 }
1141 /*
1142 * We use single SPI namespace for all protocols, so it is
1143 * impossible to have SPI duplicates in the SAVHASH.
1144 */
1145 if (sav != NULL) {
1146 if (sav->state != SADB_SASTATE_LARVAL &&
1147 sav->sah->saidx.proto == proto &&
1148 key_sockaddrcmp(&dst->sa,
1149 &sav->sah->saidx.dst.sa, 0) == 0)
1150 SAV_ADDREF(sav);
1151 else
1152 sav = NULL;
1153 }
1154 SAHTREE_RUNLOCK();
1155
1156 if (sav == NULL) {
1157 KEYDBG(IPSEC_STAMP,
1158 char buf[IPSEC_ADDRSTRLEN];
1159 printf("%s: SA not found for spi %u proto %u dst %s\n",
1160 __func__, ntohl(spi), proto, ipsec_address(dst, buf,
1161 sizeof(buf))));
1162 } else {
1163 KEYDBG(IPSEC_STAMP,
1164 printf("%s: return SA(%p)\n", __func__, sav));
1165 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1166 }
1167 return (sav);
1168 }
1169
1170 struct secasvar *
key_allocsa_tunnel(union sockaddr_union * src,union sockaddr_union * dst,uint8_t proto)1171 key_allocsa_tunnel(union sockaddr_union *src, union sockaddr_union *dst,
1172 uint8_t proto)
1173 {
1174 SAHTREE_RLOCK_TRACKER;
1175 struct secasindex saidx;
1176 struct secashead *sah;
1177 struct secasvar *sav;
1178
1179 IPSEC_ASSERT(src != NULL, ("null src address"));
1180 IPSEC_ASSERT(dst != NULL, ("null dst address"));
1181
1182 KEY_SETSECASIDX(proto, IPSEC_MODE_TUNNEL, 0, &src->sa,
1183 &dst->sa, &saidx);
1184
1185 sav = NULL;
1186 SAHTREE_RLOCK();
1187 LIST_FOREACH(sah, SAHADDRHASH_HASH(&saidx), addrhash) {
1188 if (IPSEC_MODE_TUNNEL != sah->saidx.mode)
1189 continue;
1190 if (proto != sah->saidx.proto)
1191 continue;
1192 if (key_sockaddrcmp(&src->sa, &sah->saidx.src.sa, 0) != 0)
1193 continue;
1194 if (key_sockaddrcmp(&dst->sa, &sah->saidx.dst.sa, 0) != 0)
1195 continue;
1196 /* XXXAE: is key_preferred_oldsa reasonably?*/
1197 if (V_key_preferred_oldsa)
1198 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
1199 else
1200 sav = TAILQ_FIRST(&sah->savtree_alive);
1201 if (sav != NULL) {
1202 SAV_ADDREF(sav);
1203 break;
1204 }
1205 }
1206 SAHTREE_RUNLOCK();
1207 KEYDBG(IPSEC_STAMP,
1208 printf("%s: return SA(%p)\n", __func__, sav));
1209 if (sav != NULL)
1210 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1211 return (sav);
1212 }
1213
1214 /*
1215 * Must be called after calling key_allocsp().
1216 */
1217 void
key_freesp(struct secpolicy ** spp)1218 key_freesp(struct secpolicy **spp)
1219 {
1220 struct secpolicy *sp = *spp;
1221
1222 IPSEC_ASSERT(sp != NULL, ("null sp"));
1223 if (SP_DELREF(sp) == 0)
1224 return;
1225
1226 KEYDBG(IPSEC_STAMP,
1227 printf("%s: last reference to SP(%p)\n", __func__, sp));
1228 KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
1229
1230 *spp = NULL;
1231 while (sp->tcount > 0)
1232 ipsec_delisr(sp->req[--sp->tcount]);
1233 free(sp, M_IPSEC_SP);
1234 }
1235
1236 static void
key_unlink(struct secpolicy * sp)1237 key_unlink(struct secpolicy *sp)
1238 {
1239 SPTREE_WLOCK();
1240 key_detach(sp);
1241 SPTREE_WUNLOCK();
1242 if (SPDCACHE_ENABLED())
1243 spdcache_clear();
1244 key_freesp(&sp);
1245 }
1246
1247 static void
key_detach(struct secpolicy * sp)1248 key_detach(struct secpolicy *sp)
1249 {
1250 IPSEC_ASSERT(sp->spidx.dir == IPSEC_DIR_INBOUND ||
1251 sp->spidx.dir == IPSEC_DIR_OUTBOUND,
1252 ("invalid direction %u", sp->spidx.dir));
1253 SPTREE_WLOCK_ASSERT();
1254
1255 KEYDBG(KEY_STAMP,
1256 printf("%s: SP(%p)\n", __func__, sp));
1257 if (sp->state != IPSEC_SPSTATE_ALIVE) {
1258 /* SP is already unlinked */
1259 return;
1260 }
1261 sp->state = IPSEC_SPSTATE_DEAD;
1262 TAILQ_REMOVE(&V_sptree[sp->spidx.dir], sp, chain);
1263 V_spd_size--;
1264 LIST_REMOVE(sp, idhash);
1265 V_sp_genid++;
1266 }
1267
1268 /*
1269 * insert a secpolicy into the SP database. Lower priorities first
1270 */
1271 static void
key_insertsp(struct secpolicy * newsp)1272 key_insertsp(struct secpolicy *newsp)
1273 {
1274 struct secpolicy *sp;
1275
1276 SPTREE_WLOCK_ASSERT();
1277 TAILQ_FOREACH(sp, &V_sptree[newsp->spidx.dir], chain) {
1278 if (newsp->priority < sp->priority) {
1279 TAILQ_INSERT_BEFORE(sp, newsp, chain);
1280 goto done;
1281 }
1282 }
1283 TAILQ_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, chain);
1284 done:
1285 LIST_INSERT_HEAD(SPHASH_HASH(newsp->id), newsp, idhash);
1286 newsp->state = IPSEC_SPSTATE_ALIVE;
1287 V_spd_size++;
1288 V_sp_genid++;
1289 }
1290
1291 /*
1292 * Insert a bunch of VTI secpolicies into the SPDB.
1293 * We keep VTI policies in the separate list due to following reasons:
1294 * 1) they should be immutable to user's or some deamon's attempts to
1295 * delete. The only way delete such policies - destroy or unconfigure
1296 * corresponding virtual inteface.
1297 * 2) such policies have traffic selector that matches all traffic per
1298 * address family.
1299 * Since all VTI policies have the same priority, we don't care about
1300 * policies order.
1301 */
1302 int
key_register_ifnet(struct secpolicy ** spp,u_int count)1303 key_register_ifnet(struct secpolicy **spp, u_int count)
1304 {
1305 struct mbuf *m;
1306 u_int i;
1307
1308 SPTREE_WLOCK();
1309 /*
1310 * First of try to acquire id for each SP.
1311 */
1312 for (i = 0; i < count; i++) {
1313 IPSEC_ASSERT(spp[i]->spidx.dir == IPSEC_DIR_INBOUND ||
1314 spp[i]->spidx.dir == IPSEC_DIR_OUTBOUND,
1315 ("invalid direction %u", spp[i]->spidx.dir));
1316
1317 if ((spp[i]->id = key_getnewspid()) == 0) {
1318 SPTREE_WUNLOCK();
1319 return (EAGAIN);
1320 }
1321 }
1322 for (i = 0; i < count; i++) {
1323 TAILQ_INSERT_TAIL(&V_sptree_ifnet[spp[i]->spidx.dir],
1324 spp[i], chain);
1325 /*
1326 * NOTE: despite the fact that we keep VTI SP in the
1327 * separate list, SPHASH contains policies from both
1328 * sources. Thus SADB_X_SPDGET will correctly return
1329 * SP by id, because it uses SPHASH for lookups.
1330 */
1331 LIST_INSERT_HEAD(SPHASH_HASH(spp[i]->id), spp[i], idhash);
1332 spp[i]->state = IPSEC_SPSTATE_IFNET;
1333 }
1334 SPTREE_WUNLOCK();
1335 /*
1336 * Notify user processes about new SP.
1337 */
1338 for (i = 0; i < count; i++) {
1339 m = key_setdumpsp(spp[i], SADB_X_SPDADD, 0, 0);
1340 if (m != NULL)
1341 key_sendup_mbuf(NULL, m, KEY_SENDUP_ALL);
1342 }
1343 return (0);
1344 }
1345
1346 void
key_unregister_ifnet(struct secpolicy ** spp,u_int count)1347 key_unregister_ifnet(struct secpolicy **spp, u_int count)
1348 {
1349 struct mbuf *m;
1350 u_int i;
1351
1352 SPTREE_WLOCK();
1353 for (i = 0; i < count; i++) {
1354 IPSEC_ASSERT(spp[i]->spidx.dir == IPSEC_DIR_INBOUND ||
1355 spp[i]->spidx.dir == IPSEC_DIR_OUTBOUND,
1356 ("invalid direction %u", spp[i]->spidx.dir));
1357
1358 if (spp[i]->state != IPSEC_SPSTATE_IFNET)
1359 continue;
1360 spp[i]->state = IPSEC_SPSTATE_DEAD;
1361 TAILQ_REMOVE(&V_sptree_ifnet[spp[i]->spidx.dir],
1362 spp[i], chain);
1363 V_spd_size--;
1364 LIST_REMOVE(spp[i], idhash);
1365 }
1366 SPTREE_WUNLOCK();
1367 if (SPDCACHE_ENABLED())
1368 spdcache_clear();
1369
1370 for (i = 0; i < count; i++) {
1371 m = key_setdumpsp(spp[i], SADB_X_SPDDELETE, 0, 0);
1372 if (m != NULL)
1373 key_sendup_mbuf(NULL, m, KEY_SENDUP_ALL);
1374 }
1375 }
1376
1377 /*
1378 * Must be called after calling key_allocsa().
1379 * This function is called by key_freesp() to free some SA allocated
1380 * for a policy.
1381 */
1382 void
key_freesav(struct secasvar ** psav)1383 key_freesav(struct secasvar **psav)
1384 {
1385 struct secasvar *sav = *psav;
1386
1387 IPSEC_ASSERT(sav != NULL, ("null sav"));
1388 CURVNET_ASSERT_SET();
1389 if (SAV_DELREF(sav) == 0)
1390 return;
1391
1392 KEYDBG(IPSEC_STAMP,
1393 printf("%s: last reference to SA(%p)\n", __func__, sav));
1394
1395 *psav = NULL;
1396 key_delsav(sav);
1397 }
1398
1399 /*
1400 * Unlink SA from SAH and SPI hash under SAHTREE_WLOCK.
1401 * Expect that SA has extra reference due to lookup.
1402 * Release this references, also release SAH reference after unlink.
1403 */
1404 static void
key_unlinksav(struct secasvar * sav)1405 key_unlinksav(struct secasvar *sav)
1406 {
1407 struct secashead *sah;
1408
1409 KEYDBG(KEY_STAMP,
1410 printf("%s: SA(%p)\n", __func__, sav));
1411
1412 CURVNET_ASSERT_SET();
1413 SAHTREE_UNLOCK_ASSERT();
1414 SAHTREE_WLOCK();
1415 if (sav->state == SADB_SASTATE_DEAD) {
1416 /* SA is already unlinked */
1417 SAHTREE_WUNLOCK();
1418 return;
1419 }
1420 /* Unlink from SAH */
1421 if (sav->state == SADB_SASTATE_LARVAL)
1422 TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
1423 else
1424 TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
1425 /* Unlink from SPI hash */
1426 LIST_REMOVE(sav, spihash);
1427 sav->state = SADB_SASTATE_DEAD;
1428 sah = sav->sah;
1429 SAHTREE_WUNLOCK();
1430 key_freesav(&sav);
1431 /* Since we are unlinked, release reference to SAH */
1432 key_freesah(&sah);
1433 }
1434
1435 /* %%% SPD management */
1436 /*
1437 * search SPD
1438 * OUT: NULL : not found
1439 * others : found, pointer to a SP.
1440 */
1441 static struct secpolicy *
key_getsp(struct secpolicyindex * spidx)1442 key_getsp(struct secpolicyindex *spidx)
1443 {
1444 SPTREE_RLOCK_TRACKER;
1445 struct secpolicy *sp;
1446
1447 IPSEC_ASSERT(spidx != NULL, ("null spidx"));
1448
1449 SPTREE_RLOCK();
1450 TAILQ_FOREACH(sp, &V_sptree[spidx->dir], chain) {
1451 if (key_cmpspidx_exactly(spidx, &sp->spidx)) {
1452 SP_ADDREF(sp);
1453 break;
1454 }
1455 }
1456 SPTREE_RUNLOCK();
1457
1458 return sp;
1459 }
1460
1461 /*
1462 * get SP by index.
1463 * OUT: NULL : not found
1464 * others : found, pointer to referenced SP.
1465 */
1466 static struct secpolicy *
key_getspbyid(uint32_t id)1467 key_getspbyid(uint32_t id)
1468 {
1469 SPTREE_RLOCK_TRACKER;
1470 struct secpolicy *sp;
1471
1472 SPTREE_RLOCK();
1473 LIST_FOREACH(sp, SPHASH_HASH(id), idhash) {
1474 if (sp->id == id) {
1475 SP_ADDREF(sp);
1476 break;
1477 }
1478 }
1479 SPTREE_RUNLOCK();
1480 return (sp);
1481 }
1482
1483 struct secpolicy *
key_newsp(void)1484 key_newsp(void)
1485 {
1486 struct secpolicy *sp;
1487
1488 sp = malloc(sizeof(*sp), M_IPSEC_SP, M_NOWAIT | M_ZERO);
1489 if (sp != NULL)
1490 SP_INITREF(sp);
1491 return (sp);
1492 }
1493
1494 struct ipsecrequest *
ipsec_newisr(void)1495 ipsec_newisr(void)
1496 {
1497
1498 return (malloc(sizeof(struct ipsecrequest), M_IPSEC_SR,
1499 M_NOWAIT | M_ZERO));
1500 }
1501
1502 void
ipsec_delisr(struct ipsecrequest * p)1503 ipsec_delisr(struct ipsecrequest *p)
1504 {
1505
1506 free(p, M_IPSEC_SR);
1507 }
1508
1509 /*
1510 * create secpolicy structure from sadb_x_policy structure.
1511 * NOTE: `state', `secpolicyindex' and 'id' in secpolicy structure
1512 * are not set, so must be set properly later.
1513 */
1514 struct secpolicy *
key_msg2sp(struct sadb_x_policy * xpl0,size_t len,int * error)1515 key_msg2sp(struct sadb_x_policy *xpl0, size_t len, int *error)
1516 {
1517 struct secpolicy *newsp;
1518
1519 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0"));
1520 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len));
1521
1522 if (len != PFKEY_EXTLEN(xpl0)) {
1523 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__));
1524 *error = EINVAL;
1525 return NULL;
1526 }
1527
1528 if ((newsp = key_newsp()) == NULL) {
1529 *error = ENOBUFS;
1530 return NULL;
1531 }
1532
1533 newsp->spidx.dir = xpl0->sadb_x_policy_dir;
1534 newsp->policy = xpl0->sadb_x_policy_type;
1535 newsp->priority = xpl0->sadb_x_policy_priority;
1536 newsp->tcount = 0;
1537
1538 /* check policy */
1539 switch (xpl0->sadb_x_policy_type) {
1540 case IPSEC_POLICY_DISCARD:
1541 case IPSEC_POLICY_NONE:
1542 case IPSEC_POLICY_ENTRUST:
1543 case IPSEC_POLICY_BYPASS:
1544 break;
1545
1546 case IPSEC_POLICY_IPSEC:
1547 {
1548 struct sadb_x_ipsecrequest *xisr;
1549 struct ipsecrequest *isr;
1550 int tlen;
1551
1552 /* validity check */
1553 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) {
1554 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n",
1555 __func__));
1556 key_freesp(&newsp);
1557 *error = EINVAL;
1558 return NULL;
1559 }
1560
1561 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0);
1562 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1);
1563
1564 while (tlen > 0) {
1565 /* length check */
1566 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr) ||
1567 xisr->sadb_x_ipsecrequest_len > tlen) {
1568 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest "
1569 "length.\n", __func__));
1570 key_freesp(&newsp);
1571 *error = EINVAL;
1572 return NULL;
1573 }
1574
1575 if (newsp->tcount >= IPSEC_MAXREQ) {
1576 ipseclog((LOG_DEBUG,
1577 "%s: too many ipsecrequests.\n",
1578 __func__));
1579 key_freesp(&newsp);
1580 *error = EINVAL;
1581 return (NULL);
1582 }
1583
1584 /* allocate request buffer */
1585 /* NB: data structure is zero'd */
1586 isr = ipsec_newisr();
1587 if (isr == NULL) {
1588 ipseclog((LOG_DEBUG,
1589 "%s: No more memory.\n", __func__));
1590 key_freesp(&newsp);
1591 *error = ENOBUFS;
1592 return NULL;
1593 }
1594
1595 newsp->req[newsp->tcount++] = isr;
1596
1597 /* set values */
1598 switch (xisr->sadb_x_ipsecrequest_proto) {
1599 case IPPROTO_ESP:
1600 case IPPROTO_AH:
1601 case IPPROTO_IPCOMP:
1602 break;
1603 default:
1604 ipseclog((LOG_DEBUG,
1605 "%s: invalid proto type=%u\n", __func__,
1606 xisr->sadb_x_ipsecrequest_proto));
1607 key_freesp(&newsp);
1608 *error = EPROTONOSUPPORT;
1609 return NULL;
1610 }
1611 isr->saidx.proto =
1612 (uint8_t)xisr->sadb_x_ipsecrequest_proto;
1613
1614 switch (xisr->sadb_x_ipsecrequest_mode) {
1615 case IPSEC_MODE_TRANSPORT:
1616 case IPSEC_MODE_TUNNEL:
1617 break;
1618 case IPSEC_MODE_ANY:
1619 default:
1620 ipseclog((LOG_DEBUG,
1621 "%s: invalid mode=%u\n", __func__,
1622 xisr->sadb_x_ipsecrequest_mode));
1623 key_freesp(&newsp);
1624 *error = EINVAL;
1625 return NULL;
1626 }
1627 isr->saidx.mode = xisr->sadb_x_ipsecrequest_mode;
1628
1629 switch (xisr->sadb_x_ipsecrequest_level) {
1630 case IPSEC_LEVEL_DEFAULT:
1631 case IPSEC_LEVEL_USE:
1632 case IPSEC_LEVEL_REQUIRE:
1633 break;
1634 case IPSEC_LEVEL_UNIQUE:
1635 /* validity check */
1636 /*
1637 * If range violation of reqid, kernel will
1638 * update it, don't refuse it.
1639 */
1640 if (xisr->sadb_x_ipsecrequest_reqid
1641 > IPSEC_MANUAL_REQID_MAX) {
1642 ipseclog((LOG_DEBUG,
1643 "%s: reqid=%d range "
1644 "violation, updated by kernel.\n",
1645 __func__,
1646 xisr->sadb_x_ipsecrequest_reqid));
1647 xisr->sadb_x_ipsecrequest_reqid = 0;
1648 }
1649
1650 /* allocate new reqid id if reqid is zero. */
1651 if (xisr->sadb_x_ipsecrequest_reqid == 0) {
1652 u_int32_t reqid;
1653 if ((reqid = key_newreqid()) == 0) {
1654 key_freesp(&newsp);
1655 *error = ENOBUFS;
1656 return NULL;
1657 }
1658 isr->saidx.reqid = reqid;
1659 xisr->sadb_x_ipsecrequest_reqid = reqid;
1660 } else {
1661 /* set it for manual keying. */
1662 isr->saidx.reqid =
1663 xisr->sadb_x_ipsecrequest_reqid;
1664 }
1665 break;
1666
1667 default:
1668 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n",
1669 __func__,
1670 xisr->sadb_x_ipsecrequest_level));
1671 key_freesp(&newsp);
1672 *error = EINVAL;
1673 return NULL;
1674 }
1675 isr->level = xisr->sadb_x_ipsecrequest_level;
1676
1677 /* set IP addresses if there */
1678 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
1679 struct sockaddr *paddr;
1680
1681 len = tlen - sizeof(*xisr);
1682 paddr = (struct sockaddr *)(xisr + 1);
1683 /* validity check */
1684 if (len < sizeof(struct sockaddr) ||
1685 len < 2 * paddr->sa_len ||
1686 paddr->sa_len > sizeof(isr->saidx.src)) {
1687 ipseclog((LOG_DEBUG, "%s: invalid "
1688 "request address length.\n",
1689 __func__));
1690 key_freesp(&newsp);
1691 *error = EINVAL;
1692 return NULL;
1693 }
1694 /*
1695 * Request length should be enough to keep
1696 * source and destination addresses.
1697 */
1698 if (xisr->sadb_x_ipsecrequest_len <
1699 sizeof(*xisr) + 2 * paddr->sa_len) {
1700 ipseclog((LOG_DEBUG, "%s: invalid "
1701 "ipsecrequest length.\n",
1702 __func__));
1703 key_freesp(&newsp);
1704 *error = EINVAL;
1705 return (NULL);
1706 }
1707 bcopy(paddr, &isr->saidx.src, paddr->sa_len);
1708 paddr = (struct sockaddr *)((caddr_t)paddr +
1709 paddr->sa_len);
1710
1711 /* validity check */
1712 if (paddr->sa_len !=
1713 isr->saidx.src.sa.sa_len) {
1714 ipseclog((LOG_DEBUG, "%s: invalid "
1715 "request address length.\n",
1716 __func__));
1717 key_freesp(&newsp);
1718 *error = EINVAL;
1719 return NULL;
1720 }
1721 /* AF family should match */
1722 if (paddr->sa_family !=
1723 isr->saidx.src.sa.sa_family) {
1724 ipseclog((LOG_DEBUG, "%s: address "
1725 "family doesn't match.\n",
1726 __func__));
1727 key_freesp(&newsp);
1728 *error = EINVAL;
1729 return (NULL);
1730 }
1731 bcopy(paddr, &isr->saidx.dst, paddr->sa_len);
1732 } else {
1733 /*
1734 * Addresses for TUNNEL mode requests are
1735 * mandatory.
1736 */
1737 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1738 ipseclog((LOG_DEBUG, "%s: missing "
1739 "request addresses.\n", __func__));
1740 key_freesp(&newsp);
1741 *error = EINVAL;
1742 return (NULL);
1743 }
1744 }
1745 tlen -= xisr->sadb_x_ipsecrequest_len;
1746
1747 /* validity check */
1748 if (tlen < 0) {
1749 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n",
1750 __func__));
1751 key_freesp(&newsp);
1752 *error = EINVAL;
1753 return NULL;
1754 }
1755
1756 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr
1757 + xisr->sadb_x_ipsecrequest_len);
1758 }
1759 /* XXXAE: LARVAL SP */
1760 if (newsp->tcount < 1) {
1761 ipseclog((LOG_DEBUG, "%s: valid IPSEC transforms "
1762 "not found.\n", __func__));
1763 key_freesp(&newsp);
1764 *error = EINVAL;
1765 return (NULL);
1766 }
1767 }
1768 break;
1769 default:
1770 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
1771 key_freesp(&newsp);
1772 *error = EINVAL;
1773 return NULL;
1774 }
1775
1776 *error = 0;
1777 return (newsp);
1778 }
1779
1780 uint32_t
key_newreqid(void)1781 key_newreqid(void)
1782 {
1783 static uint32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
1784
1785 if (auto_reqid == ~0)
1786 auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
1787 else
1788 auto_reqid++;
1789
1790 /* XXX should be unique check */
1791 return (auto_reqid);
1792 }
1793
1794 /*
1795 * copy secpolicy struct to sadb_x_policy structure indicated.
1796 */
1797 static struct mbuf *
key_sp2mbuf(struct secpolicy * sp)1798 key_sp2mbuf(struct secpolicy *sp)
1799 {
1800 struct mbuf *m;
1801 size_t tlen;
1802
1803 tlen = key_getspreqmsglen(sp);
1804 m = m_get2(tlen, M_NOWAIT, MT_DATA, 0);
1805 if (m == NULL)
1806 return (NULL);
1807 m_align(m, tlen);
1808 m->m_len = tlen;
1809 if (key_sp2msg(sp, m->m_data, &tlen) != 0) {
1810 m_freem(m);
1811 return (NULL);
1812 }
1813 return (m);
1814 }
1815
1816 int
key_sp2msg(struct secpolicy * sp,void * request,size_t * len)1817 key_sp2msg(struct secpolicy *sp, void *request, size_t *len)
1818 {
1819 struct sadb_x_ipsecrequest *xisr;
1820 struct sadb_x_policy *xpl;
1821 struct ipsecrequest *isr;
1822 size_t xlen, ilen;
1823 caddr_t p;
1824 int error, i;
1825
1826 IPSEC_ASSERT(sp != NULL, ("null policy"));
1827
1828 xlen = sizeof(*xpl);
1829 if (*len < xlen)
1830 return (EINVAL);
1831
1832 error = 0;
1833 bzero(request, *len);
1834 xpl = (struct sadb_x_policy *)request;
1835 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1836 xpl->sadb_x_policy_type = sp->policy;
1837 xpl->sadb_x_policy_dir = sp->spidx.dir;
1838 xpl->sadb_x_policy_id = sp->id;
1839 xpl->sadb_x_policy_priority = sp->priority;
1840 switch (sp->state) {
1841 case IPSEC_SPSTATE_IFNET:
1842 xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_IFNET;
1843 break;
1844 case IPSEC_SPSTATE_PCB:
1845 xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_PCB;
1846 break;
1847 default:
1848 xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_GLOBAL;
1849 }
1850
1851 /* if is the policy for ipsec ? */
1852 if (sp->policy == IPSEC_POLICY_IPSEC) {
1853 p = (caddr_t)xpl + sizeof(*xpl);
1854 for (i = 0; i < sp->tcount; i++) {
1855 isr = sp->req[i];
1856 ilen = PFKEY_ALIGN8(sizeof(*xisr) +
1857 isr->saidx.src.sa.sa_len +
1858 isr->saidx.dst.sa.sa_len);
1859 xlen += ilen;
1860 if (xlen > *len) {
1861 error = ENOBUFS;
1862 /* Calculate needed size */
1863 continue;
1864 }
1865 xisr = (struct sadb_x_ipsecrequest *)p;
1866 xisr->sadb_x_ipsecrequest_len = ilen;
1867 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto;
1868 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode;
1869 xisr->sadb_x_ipsecrequest_level = isr->level;
1870 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid;
1871
1872 p += sizeof(*xisr);
1873 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len);
1874 p += isr->saidx.src.sa.sa_len;
1875 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len);
1876 p += isr->saidx.dst.sa.sa_len;
1877 }
1878 }
1879 xpl->sadb_x_policy_len = PFKEY_UNIT64(xlen);
1880 if (error == 0)
1881 *len = xlen;
1882 else
1883 *len = sizeof(*xpl);
1884 return (error);
1885 }
1886
1887 /* m will not be freed nor modified */
1888 static struct mbuf *
key_gather_mbuf(struct mbuf * m,const struct sadb_msghdr * mhp,int ndeep,int nitem,...)1889 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp,
1890 int ndeep, int nitem, ...)
1891 {
1892 va_list ap;
1893 int idx;
1894 int i;
1895 struct mbuf *result = NULL, *n;
1896 int len;
1897
1898 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1899 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
1900
1901 va_start(ap, nitem);
1902 for (i = 0; i < nitem; i++) {
1903 idx = va_arg(ap, int);
1904 if (idx < 0 || idx > SADB_EXT_MAX)
1905 goto fail;
1906 /* don't attempt to pull empty extension */
1907 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL)
1908 continue;
1909 if (idx != SADB_EXT_RESERVED &&
1910 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0))
1911 continue;
1912
1913 if (idx == SADB_EXT_RESERVED) {
1914 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
1915
1916 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len));
1917
1918 MGETHDR(n, M_NOWAIT, MT_DATA);
1919 if (!n)
1920 goto fail;
1921 n->m_len = len;
1922 n->m_next = NULL;
1923 m_copydata(m, 0, sizeof(struct sadb_msg),
1924 mtod(n, caddr_t));
1925 } else if (i < ndeep) {
1926 len = mhp->extlen[idx];
1927 n = m_get2(len, M_NOWAIT, MT_DATA, 0);
1928 if (n == NULL)
1929 goto fail;
1930 m_align(n, len);
1931 n->m_len = len;
1932 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx],
1933 mtod(n, caddr_t));
1934 } else {
1935 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx],
1936 M_NOWAIT);
1937 }
1938 if (n == NULL)
1939 goto fail;
1940
1941 if (result)
1942 m_cat(result, n);
1943 else
1944 result = n;
1945 }
1946 va_end(ap);
1947
1948 if ((result->m_flags & M_PKTHDR) != 0) {
1949 result->m_pkthdr.len = 0;
1950 for (n = result; n; n = n->m_next)
1951 result->m_pkthdr.len += n->m_len;
1952 }
1953
1954 return result;
1955
1956 fail:
1957 m_freem(result);
1958 va_end(ap);
1959 return NULL;
1960 }
1961
1962 /*
1963 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing
1964 * add an entry to SP database, when received
1965 * <base, address(SD), (lifetime(H),) policy>
1966 * from the user(?).
1967 * Adding to SP database,
1968 * and send
1969 * <base, address(SD), (lifetime(H),) policy>
1970 * to the socket which was send.
1971 *
1972 * SPDADD set a unique policy entry.
1973 * SPDSETIDX like SPDADD without a part of policy requests.
1974 * SPDUPDATE replace a unique policy entry.
1975 *
1976 * XXXAE: serialize this in PF_KEY to avoid races.
1977 * m will always be freed.
1978 */
1979 static int
key_spdadd(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)1980 key_spdadd(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
1981 {
1982 struct secpolicyindex spidx;
1983 struct sadb_address *src0, *dst0;
1984 struct sadb_x_policy *xpl0, *xpl;
1985 struct sadb_lifetime *lft = NULL;
1986 struct secpolicy *newsp, *oldsp;
1987 int error;
1988
1989 IPSEC_ASSERT(so != NULL, ("null socket"));
1990 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1991 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
1992 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
1993
1994 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
1995 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
1996 SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY)) {
1997 ipseclog((LOG_DEBUG,
1998 "%s: invalid message: missing required header.\n",
1999 __func__));
2000 return key_senderror(so, m, EINVAL);
2001 }
2002 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
2003 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
2004 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
2005 ipseclog((LOG_DEBUG,
2006 "%s: invalid message: wrong header size.\n", __func__));
2007 return key_senderror(so, m, EINVAL);
2008 }
2009 if (!SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD)) {
2010 if (SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_HARD)) {
2011 ipseclog((LOG_DEBUG,
2012 "%s: invalid message: wrong header size.\n",
2013 __func__));
2014 return key_senderror(so, m, EINVAL);
2015 }
2016 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
2017 }
2018
2019 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
2020 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
2021 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
2022
2023 /* check the direciton */
2024 switch (xpl0->sadb_x_policy_dir) {
2025 case IPSEC_DIR_INBOUND:
2026 case IPSEC_DIR_OUTBOUND:
2027 break;
2028 default:
2029 ipseclog((LOG_DEBUG, "%s: invalid SP direction.\n", __func__));
2030 return key_senderror(so, m, EINVAL);
2031 }
2032 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */
2033 if (xpl0->sadb_x_policy_type != IPSEC_POLICY_DISCARD &&
2034 xpl0->sadb_x_policy_type != IPSEC_POLICY_NONE &&
2035 xpl0->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
2036 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
2037 return key_senderror(so, m, EINVAL);
2038 }
2039
2040 /* policy requests are mandatory when action is ipsec. */
2041 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2042 mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) {
2043 ipseclog((LOG_DEBUG,
2044 "%s: policy requests required.\n", __func__));
2045 return key_senderror(so, m, EINVAL);
2046 }
2047
2048 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
2049 (struct sockaddr *)(dst0 + 1));
2050 if (error != 0 ||
2051 src0->sadb_address_proto != dst0->sadb_address_proto) {
2052 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
2053 return key_senderror(so, m, error);
2054 }
2055 /* make secindex */
2056 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
2057 src0 + 1,
2058 dst0 + 1,
2059 src0->sadb_address_prefixlen,
2060 dst0->sadb_address_prefixlen,
2061 src0->sadb_address_proto,
2062 &spidx);
2063 /* Checking there is SP already or not. */
2064 oldsp = key_getsp(&spidx);
2065 if (oldsp != NULL) {
2066 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
2067 KEYDBG(KEY_STAMP,
2068 printf("%s: unlink SP(%p) for SPDUPDATE\n",
2069 __func__, oldsp));
2070 KEYDBG(KEY_DATA, kdebug_secpolicy(oldsp));
2071 } else {
2072 key_freesp(&oldsp);
2073 ipseclog((LOG_DEBUG,
2074 "%s: a SP entry exists already.\n", __func__));
2075 return (key_senderror(so, m, EEXIST));
2076 }
2077 }
2078
2079 /* allocate new SP entry */
2080 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) {
2081 if (oldsp != NULL) {
2082 key_unlink(oldsp);
2083 key_freesp(&oldsp); /* second for our reference */
2084 }
2085 return key_senderror(so, m, error);
2086 }
2087
2088 newsp->lastused = newsp->created = time_second;
2089 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0;
2090 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0;
2091 bcopy(&spidx, &newsp->spidx, sizeof(spidx));
2092
2093 SPTREE_WLOCK();
2094 if ((newsp->id = key_getnewspid()) == 0) {
2095 if (oldsp != NULL)
2096 key_detach(oldsp);
2097 SPTREE_WUNLOCK();
2098 if (oldsp != NULL) {
2099 key_freesp(&oldsp); /* first for key_detach */
2100 IPSEC_ASSERT(oldsp != NULL, ("null oldsp: refcount bug"));
2101 key_freesp(&oldsp); /* second for our reference */
2102 if (SPDCACHE_ENABLED()) /* refresh cache because of key_detach */
2103 spdcache_clear();
2104 }
2105 key_freesp(&newsp);
2106 return key_senderror(so, m, ENOBUFS);
2107 }
2108 if (oldsp != NULL)
2109 key_detach(oldsp);
2110 key_insertsp(newsp);
2111 SPTREE_WUNLOCK();
2112 if (oldsp != NULL) {
2113 key_freesp(&oldsp); /* first for key_detach */
2114 IPSEC_ASSERT(oldsp != NULL, ("null oldsp: refcount bug"));
2115 key_freesp(&oldsp); /* second for our reference */
2116 }
2117 if (SPDCACHE_ENABLED())
2118 spdcache_clear();
2119 KEYDBG(KEY_STAMP,
2120 printf("%s: SP(%p)\n", __func__, newsp));
2121 KEYDBG(KEY_DATA, kdebug_secpolicy(newsp));
2122
2123 {
2124 struct mbuf *n, *mpolicy;
2125 struct sadb_msg *newmsg;
2126 int off;
2127
2128 /* create new sadb_msg to reply. */
2129 if (lft) {
2130 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED,
2131 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD,
2132 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
2133 } else {
2134 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED,
2135 SADB_X_EXT_POLICY,
2136 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
2137 }
2138 if (!n)
2139 return key_senderror(so, m, ENOBUFS);
2140
2141 if (n->m_len < sizeof(*newmsg)) {
2142 n = m_pullup(n, sizeof(*newmsg));
2143 if (!n)
2144 return key_senderror(so, m, ENOBUFS);
2145 }
2146 newmsg = mtod(n, struct sadb_msg *);
2147 newmsg->sadb_msg_errno = 0;
2148 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2149
2150 off = 0;
2151 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)),
2152 sizeof(*xpl), &off);
2153 if (mpolicy == NULL) {
2154 /* n is already freed */
2155 return key_senderror(so, m, ENOBUFS);
2156 }
2157 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off);
2158 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
2159 m_freem(n);
2160 return key_senderror(so, m, EINVAL);
2161 }
2162 xpl->sadb_x_policy_id = newsp->id;
2163
2164 m_freem(m);
2165 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2166 }
2167 }
2168
2169 /*
2170 * get new policy id.
2171 * OUT:
2172 * 0: failure.
2173 * others: success.
2174 */
2175 static uint32_t
key_getnewspid(void)2176 key_getnewspid(void)
2177 {
2178 struct secpolicy *sp;
2179 uint32_t newid = 0;
2180 int tries, limit;
2181
2182 SPTREE_WLOCK_ASSERT();
2183
2184 limit = atomic_load_int(&V_key_spi_trycnt);
2185 for (tries = 0; tries < limit; tries++) {
2186 if (V_policy_id == ~0) /* overflowed */
2187 newid = V_policy_id = 1;
2188 else
2189 newid = ++V_policy_id;
2190 LIST_FOREACH(sp, SPHASH_HASH(newid), idhash) {
2191 if (sp->id == newid)
2192 break;
2193 }
2194 if (sp == NULL)
2195 break;
2196 }
2197 if (tries == limit || newid == 0) {
2198 ipseclog((LOG_DEBUG, "%s: failed to allocate policy id.\n",
2199 __func__));
2200 return (0);
2201 }
2202 return (newid);
2203 }
2204
2205 /*
2206 * SADB_SPDDELETE processing
2207 * receive
2208 * <base, address(SD), policy(*)>
2209 * from the user(?), and set SADB_SASTATE_DEAD,
2210 * and send,
2211 * <base, address(SD), policy(*)>
2212 * to the ikmpd.
2213 * policy(*) including direction of policy.
2214 *
2215 * m will always be freed.
2216 */
2217 static int
key_spddelete(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2218 key_spddelete(struct socket *so, struct mbuf *m,
2219 const struct sadb_msghdr *mhp)
2220 {
2221 struct secpolicyindex spidx;
2222 struct sadb_address *src0, *dst0;
2223 struct sadb_x_policy *xpl0;
2224 struct secpolicy *sp;
2225
2226 IPSEC_ASSERT(so != NULL, ("null so"));
2227 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2228 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2229 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2230
2231 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
2232 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
2233 SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY)) {
2234 ipseclog((LOG_DEBUG,
2235 "%s: invalid message: missing required header.\n",
2236 __func__));
2237 return key_senderror(so, m, EINVAL);
2238 }
2239 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
2240 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
2241 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
2242 ipseclog((LOG_DEBUG,
2243 "%s: invalid message: wrong header size.\n", __func__));
2244 return key_senderror(so, m, EINVAL);
2245 }
2246
2247 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
2248 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
2249 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
2250
2251 /* check the direciton */
2252 switch (xpl0->sadb_x_policy_dir) {
2253 case IPSEC_DIR_INBOUND:
2254 case IPSEC_DIR_OUTBOUND:
2255 break;
2256 default:
2257 ipseclog((LOG_DEBUG, "%s: invalid SP direction.\n", __func__));
2258 return key_senderror(so, m, EINVAL);
2259 }
2260 /* Only DISCARD, NONE and IPSEC are allowed */
2261 if (xpl0->sadb_x_policy_type != IPSEC_POLICY_DISCARD &&
2262 xpl0->sadb_x_policy_type != IPSEC_POLICY_NONE &&
2263 xpl0->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
2264 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
2265 return key_senderror(so, m, EINVAL);
2266 }
2267 if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
2268 (struct sockaddr *)(dst0 + 1)) != 0 ||
2269 src0->sadb_address_proto != dst0->sadb_address_proto) {
2270 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
2271 return key_senderror(so, m, EINVAL);
2272 }
2273 /* make secindex */
2274 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
2275 src0 + 1,
2276 dst0 + 1,
2277 src0->sadb_address_prefixlen,
2278 dst0->sadb_address_prefixlen,
2279 src0->sadb_address_proto,
2280 &spidx);
2281
2282 /* Is there SP in SPD ? */
2283 if ((sp = key_getsp(&spidx)) == NULL) {
2284 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__));
2285 return key_senderror(so, m, EINVAL);
2286 }
2287
2288 /* save policy id to buffer to be returned. */
2289 xpl0->sadb_x_policy_id = sp->id;
2290
2291 KEYDBG(KEY_STAMP,
2292 printf("%s: SP(%p)\n", __func__, sp));
2293 KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
2294 key_unlink(sp);
2295 key_freesp(&sp);
2296
2297 {
2298 struct mbuf *n;
2299 struct sadb_msg *newmsg;
2300
2301 /* create new sadb_msg to reply. */
2302 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
2303 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
2304 if (!n)
2305 return key_senderror(so, m, ENOBUFS);
2306
2307 newmsg = mtod(n, struct sadb_msg *);
2308 newmsg->sadb_msg_errno = 0;
2309 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2310
2311 m_freem(m);
2312 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2313 }
2314 }
2315
2316 /*
2317 * SADB_SPDDELETE2 processing
2318 * receive
2319 * <base, policy(*)>
2320 * from the user(?), and set SADB_SASTATE_DEAD,
2321 * and send,
2322 * <base, policy(*)>
2323 * to the ikmpd.
2324 * policy(*) including direction of policy.
2325 *
2326 * m will always be freed.
2327 */
2328 static int
key_spddelete2(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2329 key_spddelete2(struct socket *so, struct mbuf *m,
2330 const struct sadb_msghdr *mhp)
2331 {
2332 struct secpolicy *sp;
2333 uint32_t id;
2334
2335 IPSEC_ASSERT(so != NULL, ("null socket"));
2336 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2337 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2338 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2339
2340 if (SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY) ||
2341 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
2342 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
2343 __func__));
2344 return key_senderror(so, m, EINVAL);
2345 }
2346
2347 id = ((struct sadb_x_policy *)
2348 mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2349
2350 /* Is there SP in SPD ? */
2351 if ((sp = key_getspbyid(id)) == NULL) {
2352 ipseclog((LOG_DEBUG, "%s: no SP found for id %u.\n",
2353 __func__, id));
2354 return key_senderror(so, m, EINVAL);
2355 }
2356
2357 KEYDBG(KEY_STAMP,
2358 printf("%s: SP(%p)\n", __func__, sp));
2359 KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
2360 key_unlink(sp);
2361 if (sp->state != IPSEC_SPSTATE_DEAD) {
2362 ipseclog((LOG_DEBUG, "%s: failed to delete SP with id %u.\n",
2363 __func__, id));
2364 key_freesp(&sp);
2365 return (key_senderror(so, m, EACCES));
2366 }
2367 key_freesp(&sp);
2368
2369 {
2370 struct mbuf *n, *nn;
2371 struct sadb_msg *newmsg;
2372 int off, len;
2373
2374 /* create new sadb_msg to reply. */
2375 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2376
2377 n = key_mget(len);
2378 if (n == NULL)
2379 return key_senderror(so, m, ENOBUFS);
2380
2381 n->m_len = len;
2382 n->m_next = NULL;
2383 off = 0;
2384
2385 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
2386 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
2387
2388 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)",
2389 off, len));
2390
2391 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY],
2392 mhp->extlen[SADB_X_EXT_POLICY], M_NOWAIT);
2393 if (!n->m_next) {
2394 m_freem(n);
2395 return key_senderror(so, m, ENOBUFS);
2396 }
2397
2398 n->m_pkthdr.len = 0;
2399 for (nn = n; nn; nn = nn->m_next)
2400 n->m_pkthdr.len += nn->m_len;
2401
2402 newmsg = mtod(n, struct sadb_msg *);
2403 newmsg->sadb_msg_errno = 0;
2404 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2405
2406 m_freem(m);
2407 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2408 }
2409 }
2410
2411 /*
2412 * SADB_X_SPDGET processing
2413 * receive
2414 * <base, policy(*)>
2415 * from the user(?),
2416 * and send,
2417 * <base, address(SD), policy>
2418 * to the ikmpd.
2419 * policy(*) including direction of policy.
2420 *
2421 * m will always be freed.
2422 */
2423 static int
key_spdget(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2424 key_spdget(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2425 {
2426 struct secpolicy *sp;
2427 struct mbuf *n;
2428 uint32_t id;
2429
2430 IPSEC_ASSERT(so != NULL, ("null socket"));
2431 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2432 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2433 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2434
2435 if (SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY) ||
2436 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
2437 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
2438 __func__));
2439 return key_senderror(so, m, EINVAL);
2440 }
2441
2442 id = ((struct sadb_x_policy *)
2443 mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2444
2445 /* Is there SP in SPD ? */
2446 if ((sp = key_getspbyid(id)) == NULL) {
2447 ipseclog((LOG_DEBUG, "%s: no SP found for id %u.\n",
2448 __func__, id));
2449 return key_senderror(so, m, ENOENT);
2450 }
2451
2452 n = key_setdumpsp(sp, SADB_X_SPDGET, mhp->msg->sadb_msg_seq,
2453 mhp->msg->sadb_msg_pid);
2454 key_freesp(&sp);
2455 if (n != NULL) {
2456 m_freem(m);
2457 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2458 } else
2459 return key_senderror(so, m, ENOBUFS);
2460 }
2461
2462 /*
2463 * SADB_X_SPDACQUIRE processing.
2464 * Acquire policy and SA(s) for a *OUTBOUND* packet.
2465 * send
2466 * <base, policy(*)>
2467 * to KMD, and expect to receive
2468 * <base> with SADB_X_SPDACQUIRE if error occurred,
2469 * or
2470 * <base, policy>
2471 * with SADB_X_SPDUPDATE from KMD by PF_KEY.
2472 * policy(*) is without policy requests.
2473 *
2474 * 0 : succeed
2475 * others: error number
2476 */
2477 int
key_spdacquire(struct secpolicy * sp)2478 key_spdacquire(struct secpolicy *sp)
2479 {
2480 struct mbuf *result = NULL, *m;
2481 struct secspacq *newspacq;
2482
2483 IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
2484 IPSEC_ASSERT(sp->req == NULL, ("policy exists"));
2485 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
2486 ("policy not IPSEC %u", sp->policy));
2487
2488 /* Get an entry to check whether sent message or not. */
2489 newspacq = key_getspacq(&sp->spidx);
2490 if (newspacq != NULL) {
2491 if (V_key_blockacq_count < newspacq->count) {
2492 /* reset counter and do send message. */
2493 newspacq->count = 0;
2494 } else {
2495 /* increment counter and do nothing. */
2496 newspacq->count++;
2497 SPACQ_UNLOCK();
2498 return (0);
2499 }
2500 SPACQ_UNLOCK();
2501 } else {
2502 /* make new entry for blocking to send SADB_ACQUIRE. */
2503 newspacq = key_newspacq(&sp->spidx);
2504 if (newspacq == NULL)
2505 return ENOBUFS;
2506 }
2507
2508 /* create new sadb_msg to reply. */
2509 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0);
2510 if (!m)
2511 return ENOBUFS;
2512
2513 result = m;
2514
2515 result->m_pkthdr.len = 0;
2516 for (m = result; m; m = m->m_next)
2517 result->m_pkthdr.len += m->m_len;
2518
2519 mtod(result, struct sadb_msg *)->sadb_msg_len =
2520 PFKEY_UNIT64(result->m_pkthdr.len);
2521
2522 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED);
2523 }
2524
2525 /*
2526 * SADB_SPDFLUSH processing
2527 * receive
2528 * <base>
2529 * from the user, and free all entries in secpctree.
2530 * and send,
2531 * <base>
2532 * to the user.
2533 * NOTE: what to do is only marking SADB_SASTATE_DEAD.
2534 *
2535 * m will always be freed.
2536 */
2537 static int
key_spdflush(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2538 key_spdflush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2539 {
2540 struct secpolicy_queue drainq;
2541 struct sadb_msg *newmsg;
2542 struct secpolicy *sp, *nextsp;
2543 u_int dir;
2544
2545 IPSEC_ASSERT(so != NULL, ("null socket"));
2546 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2547 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2548 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2549
2550 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg)))
2551 return key_senderror(so, m, EINVAL);
2552
2553 TAILQ_INIT(&drainq);
2554 SPTREE_WLOCK();
2555 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2556 TAILQ_CONCAT(&drainq, &V_sptree[dir], chain);
2557 }
2558 /*
2559 * We need to set state to DEAD for each policy to be sure,
2560 * that another thread won't try to unlink it.
2561 * Also remove SP from sphash.
2562 */
2563 TAILQ_FOREACH(sp, &drainq, chain) {
2564 sp->state = IPSEC_SPSTATE_DEAD;
2565 LIST_REMOVE(sp, idhash);
2566 }
2567 V_sp_genid++;
2568 V_spd_size = 0;
2569 SPTREE_WUNLOCK();
2570 if (SPDCACHE_ENABLED())
2571 spdcache_clear();
2572 sp = TAILQ_FIRST(&drainq);
2573 while (sp != NULL) {
2574 nextsp = TAILQ_NEXT(sp, chain);
2575 key_freesp(&sp);
2576 sp = nextsp;
2577 }
2578
2579 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
2580 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
2581 return key_senderror(so, m, ENOBUFS);
2582 }
2583
2584 if (m->m_next)
2585 m_freem(m->m_next);
2586 m->m_next = NULL;
2587 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2588 newmsg = mtod(m, struct sadb_msg *);
2589 newmsg->sadb_msg_errno = 0;
2590 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
2591
2592 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
2593 }
2594
2595 static uint8_t
key_satype2scopemask(uint8_t satype)2596 key_satype2scopemask(uint8_t satype)
2597 {
2598
2599 if (satype == IPSEC_POLICYSCOPE_ANY)
2600 return (0xff);
2601 return (satype);
2602 }
2603 /*
2604 * SADB_SPDDUMP processing
2605 * receive
2606 * <base>
2607 * from the user, and dump all SP leaves and send,
2608 * <base> .....
2609 * to the ikmpd.
2610 *
2611 * NOTE:
2612 * sadb_msg_satype is considered as mask of policy scopes.
2613 * m will always be freed.
2614 */
2615 static int
key_spddump(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2616 key_spddump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2617 {
2618 SPTREE_RLOCK_TRACKER;
2619 struct secpolicy *sp;
2620 struct mbuf *n;
2621 int cnt;
2622 u_int dir, scope;
2623
2624 IPSEC_ASSERT(so != NULL, ("null socket"));
2625 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2626 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2627 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2628
2629 /* search SPD entry and get buffer size. */
2630 cnt = 0;
2631 scope = key_satype2scopemask(mhp->msg->sadb_msg_satype);
2632 SPTREE_RLOCK();
2633 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2634 if (scope & IPSEC_POLICYSCOPE_GLOBAL) {
2635 TAILQ_FOREACH(sp, &V_sptree[dir], chain)
2636 cnt++;
2637 }
2638 if (scope & IPSEC_POLICYSCOPE_IFNET) {
2639 TAILQ_FOREACH(sp, &V_sptree_ifnet[dir], chain)
2640 cnt++;
2641 }
2642 }
2643
2644 if (cnt == 0) {
2645 SPTREE_RUNLOCK();
2646 return key_senderror(so, m, ENOENT);
2647 }
2648
2649 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2650 if (scope & IPSEC_POLICYSCOPE_GLOBAL) {
2651 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
2652 --cnt;
2653 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
2654 mhp->msg->sadb_msg_pid);
2655
2656 if (n != NULL)
2657 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2658 }
2659 }
2660 if (scope & IPSEC_POLICYSCOPE_IFNET) {
2661 TAILQ_FOREACH(sp, &V_sptree_ifnet[dir], chain) {
2662 --cnt;
2663 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
2664 mhp->msg->sadb_msg_pid);
2665
2666 if (n != NULL)
2667 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2668 }
2669 }
2670 }
2671
2672 SPTREE_RUNLOCK();
2673 m_freem(m);
2674 return (0);
2675 }
2676
2677 static struct mbuf *
key_setdumpsp(struct secpolicy * sp,u_int8_t type,u_int32_t seq,u_int32_t pid)2678 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq,
2679 u_int32_t pid)
2680 {
2681 struct mbuf *result = NULL, *m;
2682 struct seclifetime lt;
2683
2684 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt);
2685 if (!m)
2686 goto fail;
2687 result = m;
2688
2689 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2690 &sp->spidx.src.sa, sp->spidx.prefs,
2691 sp->spidx.ul_proto);
2692 if (!m)
2693 goto fail;
2694 m_cat(result, m);
2695
2696 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2697 &sp->spidx.dst.sa, sp->spidx.prefd,
2698 sp->spidx.ul_proto);
2699 if (!m)
2700 goto fail;
2701 m_cat(result, m);
2702
2703 m = key_sp2mbuf(sp);
2704 if (!m)
2705 goto fail;
2706 m_cat(result, m);
2707
2708 if(sp->lifetime){
2709 lt.addtime=sp->created;
2710 lt.usetime= sp->lastused;
2711 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT);
2712 if (!m)
2713 goto fail;
2714 m_cat(result, m);
2715
2716 lt.addtime=sp->lifetime;
2717 lt.usetime= sp->validtime;
2718 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD);
2719 if (!m)
2720 goto fail;
2721 m_cat(result, m);
2722 }
2723
2724 if ((result->m_flags & M_PKTHDR) == 0)
2725 goto fail;
2726
2727 if (result->m_len < sizeof(struct sadb_msg)) {
2728 result = m_pullup(result, sizeof(struct sadb_msg));
2729 if (result == NULL)
2730 goto fail;
2731 }
2732
2733 result->m_pkthdr.len = 0;
2734 for (m = result; m; m = m->m_next)
2735 result->m_pkthdr.len += m->m_len;
2736
2737 mtod(result, struct sadb_msg *)->sadb_msg_len =
2738 PFKEY_UNIT64(result->m_pkthdr.len);
2739
2740 return result;
2741
2742 fail:
2743 m_freem(result);
2744 return NULL;
2745 }
2746 /*
2747 * get PFKEY message length for security policy and request.
2748 */
2749 static size_t
key_getspreqmsglen(struct secpolicy * sp)2750 key_getspreqmsglen(struct secpolicy *sp)
2751 {
2752 size_t tlen, len;
2753 int i;
2754
2755 tlen = sizeof(struct sadb_x_policy);
2756 /* if is the policy for ipsec ? */
2757 if (sp->policy != IPSEC_POLICY_IPSEC)
2758 return (tlen);
2759
2760 /* get length of ipsec requests */
2761 for (i = 0; i < sp->tcount; i++) {
2762 len = sizeof(struct sadb_x_ipsecrequest)
2763 + sp->req[i]->saidx.src.sa.sa_len
2764 + sp->req[i]->saidx.dst.sa.sa_len;
2765
2766 tlen += PFKEY_ALIGN8(len);
2767 }
2768 return (tlen);
2769 }
2770
2771 /*
2772 * SADB_SPDEXPIRE processing
2773 * send
2774 * <base, address(SD), lifetime(CH), policy>
2775 * to KMD by PF_KEY.
2776 *
2777 * OUT: 0 : succeed
2778 * others : error number
2779 */
2780 static int
key_spdexpire(struct secpolicy * sp)2781 key_spdexpire(struct secpolicy *sp)
2782 {
2783 struct sadb_lifetime *lt;
2784 struct mbuf *result = NULL, *m;
2785 int len, error = -1;
2786
2787 IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
2788
2789 KEYDBG(KEY_STAMP,
2790 printf("%s: SP(%p)\n", __func__, sp));
2791 KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
2792
2793 /* set msg header */
2794 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0);
2795 if (!m) {
2796 error = ENOBUFS;
2797 goto fail;
2798 }
2799 result = m;
2800
2801 /* create lifetime extension (current and hard) */
2802 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
2803 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
2804 if (m == NULL) {
2805 error = ENOBUFS;
2806 goto fail;
2807 }
2808 m_align(m, len);
2809 m->m_len = len;
2810 bzero(mtod(m, caddr_t), len);
2811 lt = mtod(m, struct sadb_lifetime *);
2812 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2813 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2814 lt->sadb_lifetime_allocations = 0;
2815 lt->sadb_lifetime_bytes = 0;
2816 lt->sadb_lifetime_addtime = sp->created;
2817 lt->sadb_lifetime_usetime = sp->lastused;
2818 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
2819 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2820 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2821 lt->sadb_lifetime_allocations = 0;
2822 lt->sadb_lifetime_bytes = 0;
2823 lt->sadb_lifetime_addtime = sp->lifetime;
2824 lt->sadb_lifetime_usetime = sp->validtime;
2825 m_cat(result, m);
2826
2827 /* set sadb_address for source */
2828 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2829 &sp->spidx.src.sa,
2830 sp->spidx.prefs, sp->spidx.ul_proto);
2831 if (!m) {
2832 error = ENOBUFS;
2833 goto fail;
2834 }
2835 m_cat(result, m);
2836
2837 /* set sadb_address for destination */
2838 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2839 &sp->spidx.dst.sa,
2840 sp->spidx.prefd, sp->spidx.ul_proto);
2841 if (!m) {
2842 error = ENOBUFS;
2843 goto fail;
2844 }
2845 m_cat(result, m);
2846
2847 /* set secpolicy */
2848 m = key_sp2mbuf(sp);
2849 if (!m) {
2850 error = ENOBUFS;
2851 goto fail;
2852 }
2853 m_cat(result, m);
2854
2855 if ((result->m_flags & M_PKTHDR) == 0) {
2856 error = EINVAL;
2857 goto fail;
2858 }
2859
2860 if (result->m_len < sizeof(struct sadb_msg)) {
2861 result = m_pullup(result, sizeof(struct sadb_msg));
2862 if (result == NULL) {
2863 error = ENOBUFS;
2864 goto fail;
2865 }
2866 }
2867
2868 result->m_pkthdr.len = 0;
2869 for (m = result; m; m = m->m_next)
2870 result->m_pkthdr.len += m->m_len;
2871
2872 mtod(result, struct sadb_msg *)->sadb_msg_len =
2873 PFKEY_UNIT64(result->m_pkthdr.len);
2874
2875 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
2876
2877 fail:
2878 if (result)
2879 m_freem(result);
2880 return error;
2881 }
2882
2883 /* %%% SAD management */
2884 /*
2885 * allocating and initialize new SA head.
2886 * OUT: NULL : failure due to the lack of memory.
2887 * others : pointer to new SA head.
2888 */
2889 static struct secashead *
key_newsah(struct secasindex * saidx)2890 key_newsah(struct secasindex *saidx)
2891 {
2892 struct secashead *sah;
2893
2894 sah = malloc(sizeof(struct secashead), M_IPSEC_SAH,
2895 M_NOWAIT | M_ZERO);
2896 if (sah == NULL) {
2897 PFKEYSTAT_INC(in_nomem);
2898 return (NULL);
2899 }
2900 TAILQ_INIT(&sah->savtree_larval);
2901 TAILQ_INIT(&sah->savtree_alive);
2902 sah->saidx = *saidx;
2903 sah->state = SADB_SASTATE_DEAD;
2904 SAH_INITREF(sah);
2905
2906 KEYDBG(KEY_STAMP,
2907 printf("%s: SAH(%p)\n", __func__, sah));
2908 KEYDBG(KEY_DATA, kdebug_secash(sah, NULL));
2909 return (sah);
2910 }
2911
2912 static void
key_freesah(struct secashead ** psah)2913 key_freesah(struct secashead **psah)
2914 {
2915 struct secashead *sah = *psah;
2916
2917 CURVNET_ASSERT_SET();
2918
2919 if (SAH_DELREF(sah) == 0)
2920 return;
2921
2922 KEYDBG(KEY_STAMP,
2923 printf("%s: last reference to SAH(%p)\n", __func__, sah));
2924 KEYDBG(KEY_DATA, kdebug_secash(sah, NULL));
2925
2926 *psah = NULL;
2927 key_delsah(sah);
2928 }
2929
2930 static void
key_delsah(struct secashead * sah)2931 key_delsah(struct secashead *sah)
2932 {
2933 IPSEC_ASSERT(sah != NULL, ("NULL sah"));
2934 IPSEC_ASSERT(sah->state == SADB_SASTATE_DEAD,
2935 ("Attempt to free non DEAD SAH %p", sah));
2936 IPSEC_ASSERT(TAILQ_EMPTY(&sah->savtree_larval),
2937 ("Attempt to free SAH %p with LARVAL SA", sah));
2938 IPSEC_ASSERT(TAILQ_EMPTY(&sah->savtree_alive),
2939 ("Attempt to free SAH %p with ALIVE SA", sah));
2940
2941 free(sah, M_IPSEC_SAH);
2942 }
2943
2944 /*
2945 * allocating a new SA for key_add() and key_getspi() call,
2946 * and copy the values of mhp into new buffer.
2947 * When SAD message type is SADB_GETSPI set SA state to LARVAL.
2948 * For SADB_ADD create and initialize SA with MATURE state.
2949 * OUT: NULL : fail
2950 * others : pointer to new secasvar.
2951 */
2952 static struct secasvar *
key_newsav(const struct sadb_msghdr * mhp,struct secasindex * saidx,uint32_t spi,int * errp)2953 key_newsav(const struct sadb_msghdr *mhp, struct secasindex *saidx,
2954 uint32_t spi, int *errp)
2955 {
2956 struct secashead *sah;
2957 struct secasvar *sav;
2958 int isnew;
2959
2960 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2961 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2962 IPSEC_ASSERT(mhp->msg->sadb_msg_type == SADB_GETSPI ||
2963 mhp->msg->sadb_msg_type == SADB_ADD, ("wrong message type"));
2964
2965 sav = NULL;
2966 sah = NULL;
2967 /* check SPI value */
2968 switch (saidx->proto) {
2969 case IPPROTO_ESP:
2970 case IPPROTO_AH:
2971 /*
2972 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values
2973 * 1-255 reserved by IANA for future use,
2974 * 0 for implementation specific, local use.
2975 */
2976 if (ntohl(spi) <= 255) {
2977 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n",
2978 __func__, ntohl(spi)));
2979 *errp = EINVAL;
2980 goto done;
2981 }
2982 break;
2983 }
2984
2985 sav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT | M_ZERO);
2986 if (sav == NULL) {
2987 *errp = ENOBUFS;
2988 goto done;
2989 }
2990 sav->lock = malloc_aligned(max(sizeof(struct rmlock),
2991 CACHE_LINE_SIZE), CACHE_LINE_SIZE, M_IPSEC_MISC,
2992 M_NOWAIT | M_ZERO);
2993 if (sav->lock == NULL) {
2994 *errp = ENOBUFS;
2995 goto done;
2996 }
2997 rm_init(sav->lock, "ipsec association");
2998 sav->lft_c = uma_zalloc_pcpu(ipsec_key_lft_zone, M_NOWAIT | M_ZERO);
2999 if (sav->lft_c == NULL) {
3000 *errp = ENOBUFS;
3001 goto done;
3002 }
3003
3004 sav->spi = spi;
3005 sav->seq = mhp->msg->sadb_msg_seq;
3006 sav->state = SADB_SASTATE_LARVAL;
3007 sav->pid = (pid_t)mhp->msg->sadb_msg_pid;
3008 SAV_INITREF(sav);
3009 again:
3010 sah = key_getsah(saidx);
3011 if (sah == NULL) {
3012 /* create a new SA index */
3013 sah = key_newsah(saidx);
3014 if (sah == NULL) {
3015 ipseclog((LOG_DEBUG,
3016 "%s: No more memory.\n", __func__));
3017 *errp = ENOBUFS;
3018 goto done;
3019 }
3020 isnew = 1;
3021 } else
3022 isnew = 0;
3023
3024 sav->sah = sah;
3025 if (mhp->msg->sadb_msg_type == SADB_GETSPI) {
3026 sav->created = time_second;
3027 } else if (sav->state == SADB_SASTATE_LARVAL) {
3028 /*
3029 * Do not call key_setsaval() second time in case
3030 * of `goto again`. We will have MATURE state.
3031 */
3032 *errp = key_setsaval(sav, mhp);
3033 if (*errp != 0)
3034 goto done;
3035 sav->state = SADB_SASTATE_MATURE;
3036 }
3037
3038 SAHTREE_WLOCK();
3039 /*
3040 * Check that existing SAH wasn't unlinked.
3041 * Since we didn't hold the SAHTREE lock, it is possible,
3042 * that callout handler or key_flush() or key_delete() could
3043 * unlink this SAH.
3044 */
3045 if (isnew == 0 && sah->state == SADB_SASTATE_DEAD) {
3046 SAHTREE_WUNLOCK();
3047 key_freesah(&sah); /* reference from key_getsah() */
3048 goto again;
3049 }
3050 if (isnew != 0) {
3051 /*
3052 * Add new SAH into SADB.
3053 *
3054 * XXXAE: we can serialize key_add and key_getspi calls, so
3055 * several threads will not fight in the race.
3056 * Otherwise we should check under SAHTREE lock, that this
3057 * SAH would not added twice.
3058 */
3059 TAILQ_INSERT_HEAD(&V_sahtree, sah, chain);
3060 /* Add new SAH into hash by addresses */
3061 LIST_INSERT_HEAD(SAHADDRHASH_HASH(saidx), sah, addrhash);
3062 /* Now we are linked in the chain */
3063 sah->state = SADB_SASTATE_MATURE;
3064 /*
3065 * SAV references this new SAH.
3066 * In case of existing SAH we reuse reference
3067 * from key_getsah().
3068 */
3069 SAH_ADDREF(sah);
3070 }
3071 /* Link SAV with SAH */
3072 if (sav->state == SADB_SASTATE_MATURE)
3073 TAILQ_INSERT_HEAD(&sah->savtree_alive, sav, chain);
3074 else
3075 TAILQ_INSERT_HEAD(&sah->savtree_larval, sav, chain);
3076 /* Add SAV into SPI hash */
3077 LIST_INSERT_HEAD(SAVHASH_HASH(sav->spi), sav, spihash);
3078 SAHTREE_WUNLOCK();
3079 *errp = 0; /* success */
3080 done:
3081 if (*errp != 0) {
3082 if (sav != NULL) {
3083 if (sav->lock != NULL) {
3084 rm_destroy(sav->lock);
3085 free(sav->lock, M_IPSEC_MISC);
3086 }
3087 if (sav->lft_c != NULL)
3088 uma_zfree_pcpu(ipsec_key_lft_zone, sav->lft_c);
3089 free(sav, M_IPSEC_SA), sav = NULL;
3090 }
3091 if (sah != NULL)
3092 key_freesah(&sah);
3093 if (*errp == ENOBUFS) {
3094 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3095 __func__));
3096 PFKEYSTAT_INC(in_nomem);
3097 }
3098 }
3099 return (sav);
3100 }
3101
3102 /*
3103 * free() SA variable entry.
3104 */
3105 static void
key_cleansav(struct secasvar * sav)3106 key_cleansav(struct secasvar *sav)
3107 {
3108
3109 if (sav->natt != NULL) {
3110 free(sav->natt, M_IPSEC_MISC);
3111 sav->natt = NULL;
3112 }
3113 if (sav->flags & SADB_X_EXT_F_CLONED)
3114 return;
3115 if (sav->tdb_xform != NULL) {
3116 sav->tdb_xform->xf_cleanup(sav);
3117 sav->tdb_xform = NULL;
3118 }
3119 if (sav->key_auth != NULL) {
3120 zfree(sav->key_auth->key_data, M_IPSEC_MISC);
3121 free(sav->key_auth, M_IPSEC_MISC);
3122 sav->key_auth = NULL;
3123 }
3124 if (sav->key_enc != NULL) {
3125 zfree(sav->key_enc->key_data, M_IPSEC_MISC);
3126 free(sav->key_enc, M_IPSEC_MISC);
3127 sav->key_enc = NULL;
3128 }
3129 if (sav->replay != NULL) {
3130 mtx_destroy(&sav->replay->lock);
3131 if (sav->replay->bitmap != NULL)
3132 free(sav->replay->bitmap, M_IPSEC_MISC);
3133 free(sav->replay, M_IPSEC_MISC);
3134 sav->replay = NULL;
3135 }
3136 if (sav->lft_h != NULL) {
3137 free(sav->lft_h, M_IPSEC_MISC);
3138 sav->lft_h = NULL;
3139 }
3140 if (sav->lft_s != NULL) {
3141 free(sav->lft_s, M_IPSEC_MISC);
3142 sav->lft_s = NULL;
3143 }
3144 }
3145
3146 /*
3147 * free() SA variable entry.
3148 */
3149 static void
key_delsav(struct secasvar * sav)3150 key_delsav(struct secasvar *sav)
3151 {
3152 IPSEC_ASSERT(sav != NULL, ("null sav"));
3153 IPSEC_ASSERT(sav->state == SADB_SASTATE_DEAD,
3154 ("attempt to free non DEAD SA %p", sav));
3155 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0",
3156 sav->refcnt));
3157
3158 /*
3159 * SA must be unlinked from the chain and hashtbl.
3160 * If SA was cloned, we leave all fields untouched,
3161 * except NAT-T config.
3162 */
3163 key_cleansav(sav);
3164 if ((sav->flags & SADB_X_EXT_F_CLONED) == 0) {
3165 rm_destroy(sav->lock);
3166 free(sav->lock, M_IPSEC_MISC);
3167 uma_zfree_pcpu(ipsec_key_lft_zone, sav->lft_c);
3168 }
3169 free(sav, M_IPSEC_SA);
3170 }
3171
3172 /*
3173 * search SAH.
3174 * OUT:
3175 * NULL : not found
3176 * others : found, referenced pointer to a SAH.
3177 */
3178 static struct secashead *
key_getsah(struct secasindex * saidx)3179 key_getsah(struct secasindex *saidx)
3180 {
3181 SAHTREE_RLOCK_TRACKER;
3182 struct secashead *sah;
3183
3184 SAHTREE_RLOCK();
3185 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
3186 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID) != 0) {
3187 SAH_ADDREF(sah);
3188 break;
3189 }
3190 }
3191 SAHTREE_RUNLOCK();
3192 return (sah);
3193 }
3194
3195 /*
3196 * Check not to be duplicated SPI.
3197 * OUT:
3198 * 0 : not found
3199 * 1 : found SA with given SPI.
3200 */
3201 static int
key_checkspidup(uint32_t spi)3202 key_checkspidup(uint32_t spi)
3203 {
3204 SAHTREE_RLOCK_TRACKER;
3205 struct secasvar *sav;
3206
3207 /* Assume SPI is in network byte order */
3208 SAHTREE_RLOCK();
3209 LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
3210 if (sav->spi == spi)
3211 break;
3212 }
3213 SAHTREE_RUNLOCK();
3214 return (sav != NULL);
3215 }
3216
3217 /*
3218 * Search SA by SPI.
3219 * OUT:
3220 * NULL : not found
3221 * others : found, referenced pointer to a SA.
3222 */
3223 static struct secasvar *
key_getsavbyspi(uint32_t spi)3224 key_getsavbyspi(uint32_t spi)
3225 {
3226 SAHTREE_RLOCK_TRACKER;
3227 struct secasvar *sav;
3228
3229 /* Assume SPI is in network byte order */
3230 SAHTREE_RLOCK();
3231 LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
3232 if (sav->spi != spi)
3233 continue;
3234 SAV_ADDREF(sav);
3235 break;
3236 }
3237 SAHTREE_RUNLOCK();
3238 return (sav);
3239 }
3240
3241 static int
key_updatelifetimes(struct secasvar * sav,const struct sadb_msghdr * mhp)3242 key_updatelifetimes(struct secasvar *sav, const struct sadb_msghdr *mhp)
3243 {
3244 struct seclifetime *lft_h, *lft_s, *tmp;
3245
3246 /* Lifetime extension is optional, check that it is present. */
3247 if (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
3248 SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) {
3249 /*
3250 * In case of SADB_UPDATE we may need to change
3251 * existing lifetimes.
3252 */
3253 if (sav->state == SADB_SASTATE_MATURE) {
3254 lft_h = lft_s = NULL;
3255 goto reset;
3256 }
3257 return (0);
3258 }
3259 /* Both HARD and SOFT extensions must present */
3260 if ((SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
3261 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
3262 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
3263 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
3264 ipseclog((LOG_DEBUG,
3265 "%s: invalid message: missing required header.\n",
3266 __func__));
3267 return (EINVAL);
3268 }
3269 if (SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_HARD) ||
3270 SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_SOFT)) {
3271 ipseclog((LOG_DEBUG,
3272 "%s: invalid message: wrong header size.\n", __func__));
3273 return (EINVAL);
3274 }
3275 lft_h = key_dup_lifemsg((const struct sadb_lifetime *)
3276 mhp->ext[SADB_EXT_LIFETIME_HARD], M_IPSEC_MISC);
3277 if (lft_h == NULL) {
3278 PFKEYSTAT_INC(in_nomem);
3279 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
3280 return (ENOBUFS);
3281 }
3282 lft_s = key_dup_lifemsg((const struct sadb_lifetime *)
3283 mhp->ext[SADB_EXT_LIFETIME_SOFT], M_IPSEC_MISC);
3284 if (lft_s == NULL) {
3285 PFKEYSTAT_INC(in_nomem);
3286 free(lft_h, M_IPSEC_MISC);
3287 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
3288 return (ENOBUFS);
3289 }
3290 reset:
3291 if (sav->state != SADB_SASTATE_LARVAL) {
3292 /*
3293 * key_update() holds reference to this SA,
3294 * so it won't be deleted in meanwhile.
3295 */
3296 SECASVAR_WLOCK(sav);
3297 tmp = sav->lft_h;
3298 sav->lft_h = lft_h;
3299 lft_h = tmp;
3300
3301 tmp = sav->lft_s;
3302 sav->lft_s = lft_s;
3303 lft_s = tmp;
3304 SECASVAR_WUNLOCK(sav);
3305 if (lft_h != NULL)
3306 free(lft_h, M_IPSEC_MISC);
3307 if (lft_s != NULL)
3308 free(lft_s, M_IPSEC_MISC);
3309 return (0);
3310 }
3311 /* We can update lifetime without holding a lock */
3312 IPSEC_ASSERT(sav->lft_h == NULL, ("lft_h is already initialized\n"));
3313 IPSEC_ASSERT(sav->lft_s == NULL, ("lft_s is already initialized\n"));
3314 sav->lft_h = lft_h;
3315 sav->lft_s = lft_s;
3316 return (0);
3317 }
3318
3319 /*
3320 * copy SA values from PF_KEY message except *SPI, SEQ, PID and TYPE*.
3321 * You must update these if need. Expects only LARVAL SAs.
3322 * OUT: 0: success.
3323 * !0: failure.
3324 */
3325 static int
key_setsaval(struct secasvar * sav,const struct sadb_msghdr * mhp)3326 key_setsaval(struct secasvar *sav, const struct sadb_msghdr *mhp)
3327 {
3328 const struct sadb_sa *sa0;
3329 const struct sadb_key *key0;
3330 uint32_t replay;
3331 size_t len;
3332 int error;
3333
3334 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
3335 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
3336 IPSEC_ASSERT(sav->state == SADB_SASTATE_LARVAL,
3337 ("Attempt to update non LARVAL SA"));
3338
3339 /* XXX rewrite */
3340 error = key_setident(sav->sah, mhp);
3341 if (error != 0)
3342 goto fail;
3343
3344 /* SA */
3345 if (!SADB_CHECKHDR(mhp, SADB_EXT_SA)) {
3346 if (SADB_CHECKLEN(mhp, SADB_EXT_SA)) {
3347 error = EINVAL;
3348 goto fail;
3349 }
3350 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
3351 sav->alg_auth = sa0->sadb_sa_auth;
3352 sav->alg_enc = sa0->sadb_sa_encrypt;
3353 sav->flags = sa0->sadb_sa_flags;
3354 if ((sav->flags & SADB_KEY_FLAGS_MAX) != sav->flags) {
3355 ipseclog((LOG_DEBUG,
3356 "%s: invalid sa_flags 0x%08x.\n", __func__,
3357 sav->flags));
3358 error = EINVAL;
3359 goto fail;
3360 }
3361
3362 /* Optional replay window */
3363 replay = 0;
3364 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0)
3365 replay = sa0->sadb_sa_replay;
3366 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_SA_REPLAY)) {
3367 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA_REPLAY)) {
3368 error = EINVAL;
3369 goto fail;
3370 }
3371 replay = ((const struct sadb_x_sa_replay *)
3372 mhp->ext[SADB_X_EXT_SA_REPLAY])->sadb_x_sa_replay_replay;
3373
3374 if (replay > UINT32_MAX - 32) {
3375 ipseclog((LOG_DEBUG,
3376 "%s: replay window too big.\n", __func__));
3377 error = EINVAL;
3378 goto fail;
3379 }
3380
3381 replay = (replay + 7) >> 3;
3382 }
3383
3384 sav->replay = malloc(sizeof(struct secreplay), M_IPSEC_MISC,
3385 M_NOWAIT | M_ZERO);
3386 if (sav->replay == NULL) {
3387 PFKEYSTAT_INC(in_nomem);
3388 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3389 __func__));
3390 error = ENOBUFS;
3391 goto fail;
3392 }
3393 mtx_init(&sav->replay->lock, "ipsec replay", NULL, MTX_DEF);
3394
3395 if (replay != 0) {
3396 /* number of 32b blocks to be allocated */
3397 uint32_t bitmap_size;
3398
3399 /* RFC 6479:
3400 * - the allocated replay window size must be
3401 * a power of two.
3402 * - use an extra 32b block as a redundant window.
3403 */
3404 bitmap_size = 1;
3405 while (replay + 4 > bitmap_size)
3406 bitmap_size <<= 1;
3407 bitmap_size = bitmap_size / 4;
3408
3409 sav->replay->bitmap = malloc(
3410 bitmap_size * sizeof(uint32_t), M_IPSEC_MISC,
3411 M_NOWAIT | M_ZERO);
3412 if (sav->replay->bitmap == NULL) {
3413 PFKEYSTAT_INC(in_nomem);
3414 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3415 __func__));
3416 error = ENOBUFS;
3417 goto fail;
3418 }
3419 sav->replay->bitmap_size = bitmap_size;
3420 sav->replay->wsize = replay;
3421 }
3422 }
3423
3424 /* Authentication keys */
3425 if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH)) {
3426 if (SADB_CHECKLEN(mhp, SADB_EXT_KEY_AUTH)) {
3427 error = EINVAL;
3428 goto fail;
3429 }
3430 error = 0;
3431 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH];
3432 len = mhp->extlen[SADB_EXT_KEY_AUTH];
3433 switch (mhp->msg->sadb_msg_satype) {
3434 case SADB_SATYPE_AH:
3435 case SADB_SATYPE_ESP:
3436 case SADB_X_SATYPE_TCPSIGNATURE:
3437 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
3438 sav->alg_auth != SADB_X_AALG_NULL)
3439 error = EINVAL;
3440 break;
3441 case SADB_X_SATYPE_IPCOMP:
3442 default:
3443 error = EINVAL;
3444 break;
3445 }
3446 if (error) {
3447 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n",
3448 __func__));
3449 goto fail;
3450 }
3451
3452 sav->key_auth = key_dup_keymsg(key0, len, M_IPSEC_MISC);
3453 if (sav->key_auth == NULL ) {
3454 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3455 __func__));
3456 PFKEYSTAT_INC(in_nomem);
3457 error = ENOBUFS;
3458 goto fail;
3459 }
3460 }
3461
3462 /* Encryption key */
3463 if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT)) {
3464 if (SADB_CHECKLEN(mhp, SADB_EXT_KEY_ENCRYPT)) {
3465 error = EINVAL;
3466 goto fail;
3467 }
3468 error = 0;
3469 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT];
3470 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT];
3471 switch (mhp->msg->sadb_msg_satype) {
3472 case SADB_SATYPE_ESP:
3473 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
3474 sav->alg_enc != SADB_EALG_NULL) {
3475 error = EINVAL;
3476 break;
3477 }
3478 sav->key_enc = key_dup_keymsg(key0, len, M_IPSEC_MISC);
3479 if (sav->key_enc == NULL) {
3480 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3481 __func__));
3482 PFKEYSTAT_INC(in_nomem);
3483 error = ENOBUFS;
3484 goto fail;
3485 }
3486 break;
3487 case SADB_X_SATYPE_IPCOMP:
3488 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key)))
3489 error = EINVAL;
3490 sav->key_enc = NULL; /*just in case*/
3491 break;
3492 case SADB_SATYPE_AH:
3493 case SADB_X_SATYPE_TCPSIGNATURE:
3494 default:
3495 error = EINVAL;
3496 break;
3497 }
3498 if (error) {
3499 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n",
3500 __func__));
3501 goto fail;
3502 }
3503 }
3504
3505 /* set iv */
3506 sav->ivlen = 0;
3507 switch (mhp->msg->sadb_msg_satype) {
3508 case SADB_SATYPE_AH:
3509 if (sav->flags & SADB_X_EXT_DERIV) {
3510 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
3511 "given to AH SA.\n", __func__));
3512 error = EINVAL;
3513 goto fail;
3514 }
3515 if (sav->alg_enc != SADB_EALG_NONE) {
3516 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3517 "mismated.\n", __func__));
3518 error = EINVAL;
3519 goto fail;
3520 }
3521 error = xform_init(sav, XF_AH);
3522 break;
3523 case SADB_SATYPE_ESP:
3524 if ((sav->flags & (SADB_X_EXT_OLD | SADB_X_EXT_DERIV)) ==
3525 (SADB_X_EXT_OLD | SADB_X_EXT_DERIV)) {
3526 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
3527 "given to old-esp.\n", __func__));
3528 error = EINVAL;
3529 goto fail;
3530 }
3531 error = xform_init(sav, XF_ESP);
3532 break;
3533 case SADB_X_SATYPE_IPCOMP:
3534 if (sav->alg_auth != SADB_AALG_NONE) {
3535 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3536 "mismated.\n", __func__));
3537 error = EINVAL;
3538 goto fail;
3539 }
3540 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 &&
3541 ntohl(sav->spi) >= 0x10000) {
3542 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n",
3543 __func__));
3544 error = EINVAL;
3545 goto fail;
3546 }
3547 error = xform_init(sav, XF_IPCOMP);
3548 break;
3549 case SADB_X_SATYPE_TCPSIGNATURE:
3550 if (sav->alg_enc != SADB_EALG_NONE) {
3551 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3552 "mismated.\n", __func__));
3553 error = EINVAL;
3554 goto fail;
3555 }
3556 error = xform_init(sav, XF_TCPSIGNATURE);
3557 break;
3558 default:
3559 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__));
3560 error = EPROTONOSUPPORT;
3561 goto fail;
3562 }
3563 if (error) {
3564 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n",
3565 __func__, mhp->msg->sadb_msg_satype));
3566 goto fail;
3567 }
3568
3569 /* Handle NAT-T headers */
3570 error = key_setnatt(sav, mhp);
3571 if (error != 0)
3572 goto fail;
3573
3574 /* Initialize lifetime for CURRENT */
3575 sav->firstused = 0;
3576 sav->created = time_second;
3577
3578 /* lifetimes for HARD and SOFT */
3579 error = key_updatelifetimes(sav, mhp);
3580 if (error == 0)
3581 return (0);
3582 fail:
3583 key_cleansav(sav);
3584 return (error);
3585 }
3586
3587 /*
3588 * subroutine for SADB_GET and SADB_DUMP.
3589 */
3590 static struct mbuf *
key_setdumpsa(struct secasvar * sav,uint8_t type,uint8_t satype,uint32_t seq,uint32_t pid)3591 key_setdumpsa(struct secasvar *sav, uint8_t type, uint8_t satype,
3592 uint32_t seq, uint32_t pid)
3593 {
3594 struct seclifetime lft_c;
3595 struct mbuf *result = NULL, *tres = NULL, *m;
3596 int i, dumporder[] = {
3597 SADB_EXT_SA, SADB_X_EXT_SA2, SADB_X_EXT_SA_REPLAY,
3598 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
3599 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC,
3600 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY,
3601 SADB_EXT_KEY_AUTH, SADB_EXT_KEY_ENCRYPT,
3602 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST,
3603 SADB_EXT_SENSITIVITY,
3604 SADB_X_EXT_NAT_T_TYPE,
3605 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT,
3606 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR,
3607 SADB_X_EXT_NAT_T_FRAG,
3608 };
3609 uint32_t replay_count;
3610
3611 SECASVAR_RLOCK_TRACKER;
3612
3613 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt);
3614 if (m == NULL)
3615 goto fail;
3616 result = m;
3617
3618 for (i = nitems(dumporder) - 1; i >= 0; i--) {
3619 m = NULL;
3620 switch (dumporder[i]) {
3621 case SADB_EXT_SA:
3622 m = key_setsadbsa(sav);
3623 if (!m)
3624 goto fail;
3625 break;
3626
3627 case SADB_X_EXT_SA2: {
3628 SECASVAR_RLOCK(sav);
3629 replay_count = sav->replay ? sav->replay->count : 0;
3630 SECASVAR_RUNLOCK(sav);
3631 m = key_setsadbxsa2(sav->sah->saidx.mode, replay_count,
3632 sav->sah->saidx.reqid);
3633 if (!m)
3634 goto fail;
3635 break;
3636 }
3637 case SADB_X_EXT_SA_REPLAY:
3638 if (sav->replay == NULL ||
3639 sav->replay->wsize <= UINT8_MAX)
3640 continue;
3641
3642 m = key_setsadbxsareplay(sav->replay->wsize);
3643 if (!m)
3644 goto fail;
3645 break;
3646
3647 case SADB_EXT_ADDRESS_SRC:
3648 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
3649 &sav->sah->saidx.src.sa,
3650 FULLMASK, IPSEC_ULPROTO_ANY);
3651 if (!m)
3652 goto fail;
3653 break;
3654
3655 case SADB_EXT_ADDRESS_DST:
3656 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
3657 &sav->sah->saidx.dst.sa,
3658 FULLMASK, IPSEC_ULPROTO_ANY);
3659 if (!m)
3660 goto fail;
3661 break;
3662
3663 case SADB_EXT_KEY_AUTH:
3664 if (!sav->key_auth)
3665 continue;
3666 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH);
3667 if (!m)
3668 goto fail;
3669 break;
3670
3671 case SADB_EXT_KEY_ENCRYPT:
3672 if (!sav->key_enc)
3673 continue;
3674 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT);
3675 if (!m)
3676 goto fail;
3677 break;
3678
3679 case SADB_EXT_LIFETIME_CURRENT:
3680 lft_c.addtime = sav->created;
3681 lft_c.allocations = (uint32_t)counter_u64_fetch(
3682 sav->lft_c_allocations);
3683 lft_c.bytes = counter_u64_fetch(sav->lft_c_bytes);
3684 lft_c.usetime = sav->firstused;
3685 m = key_setlifetime(&lft_c, SADB_EXT_LIFETIME_CURRENT);
3686 if (!m)
3687 goto fail;
3688 break;
3689
3690 case SADB_EXT_LIFETIME_HARD:
3691 if (!sav->lft_h)
3692 continue;
3693 m = key_setlifetime(sav->lft_h,
3694 SADB_EXT_LIFETIME_HARD);
3695 if (!m)
3696 goto fail;
3697 break;
3698
3699 case SADB_EXT_LIFETIME_SOFT:
3700 if (!sav->lft_s)
3701 continue;
3702 m = key_setlifetime(sav->lft_s,
3703 SADB_EXT_LIFETIME_SOFT);
3704
3705 if (!m)
3706 goto fail;
3707 break;
3708
3709 case SADB_X_EXT_NAT_T_TYPE:
3710 if (sav->natt == NULL)
3711 continue;
3712 m = key_setsadbxtype(UDP_ENCAP_ESPINUDP);
3713 if (!m)
3714 goto fail;
3715 break;
3716
3717 case SADB_X_EXT_NAT_T_DPORT:
3718 if (sav->natt == NULL)
3719 continue;
3720 m = key_setsadbxport(sav->natt->dport,
3721 SADB_X_EXT_NAT_T_DPORT);
3722 if (!m)
3723 goto fail;
3724 break;
3725
3726 case SADB_X_EXT_NAT_T_SPORT:
3727 if (sav->natt == NULL)
3728 continue;
3729 m = key_setsadbxport(sav->natt->sport,
3730 SADB_X_EXT_NAT_T_SPORT);
3731 if (!m)
3732 goto fail;
3733 break;
3734
3735 case SADB_X_EXT_NAT_T_OAI:
3736 if (sav->natt == NULL ||
3737 (sav->natt->flags & IPSEC_NATT_F_OAI) == 0)
3738 continue;
3739 m = key_setsadbaddr(SADB_X_EXT_NAT_T_OAI,
3740 &sav->natt->oai.sa, FULLMASK, IPSEC_ULPROTO_ANY);
3741 if (!m)
3742 goto fail;
3743 break;
3744 case SADB_X_EXT_NAT_T_OAR:
3745 if (sav->natt == NULL ||
3746 (sav->natt->flags & IPSEC_NATT_F_OAR) == 0)
3747 continue;
3748 m = key_setsadbaddr(SADB_X_EXT_NAT_T_OAR,
3749 &sav->natt->oar.sa, FULLMASK, IPSEC_ULPROTO_ANY);
3750 if (!m)
3751 goto fail;
3752 break;
3753 case SADB_X_EXT_NAT_T_FRAG:
3754 /* We do not (yet) support those. */
3755 continue;
3756
3757 case SADB_EXT_ADDRESS_PROXY:
3758 case SADB_EXT_IDENTITY_SRC:
3759 case SADB_EXT_IDENTITY_DST:
3760 /* XXX: should we brought from SPD ? */
3761 case SADB_EXT_SENSITIVITY:
3762 default:
3763 continue;
3764 }
3765
3766 if (!m)
3767 goto fail;
3768 if (tres)
3769 m_cat(m, tres);
3770 tres = m;
3771 }
3772
3773 m_cat(result, tres);
3774 tres = NULL;
3775 if (result->m_len < sizeof(struct sadb_msg)) {
3776 result = m_pullup(result, sizeof(struct sadb_msg));
3777 if (result == NULL)
3778 goto fail;
3779 }
3780
3781 result->m_pkthdr.len = 0;
3782 for (m = result; m; m = m->m_next)
3783 result->m_pkthdr.len += m->m_len;
3784
3785 mtod(result, struct sadb_msg *)->sadb_msg_len =
3786 PFKEY_UNIT64(result->m_pkthdr.len);
3787
3788 return result;
3789
3790 fail:
3791 m_freem(result);
3792 m_freem(tres);
3793 return NULL;
3794 }
3795
3796 /*
3797 * set data into sadb_msg.
3798 */
3799 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)3800 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq,
3801 pid_t pid, u_int16_t reserved)
3802 {
3803 struct mbuf *m;
3804 struct sadb_msg *p;
3805 int len;
3806
3807 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
3808 if (len > MCLBYTES)
3809 return NULL;
3810 m = key_mget(len);
3811 if (m == NULL)
3812 return NULL;
3813 m->m_pkthdr.len = m->m_len = len;
3814 m->m_next = NULL;
3815
3816 p = mtod(m, struct sadb_msg *);
3817
3818 bzero(p, len);
3819 p->sadb_msg_version = PF_KEY_V2;
3820 p->sadb_msg_type = type;
3821 p->sadb_msg_errno = 0;
3822 p->sadb_msg_satype = satype;
3823 p->sadb_msg_len = PFKEY_UNIT64(tlen);
3824 p->sadb_msg_reserved = reserved;
3825 p->sadb_msg_seq = seq;
3826 p->sadb_msg_pid = (u_int32_t)pid;
3827
3828 return m;
3829 }
3830
3831 /*
3832 * copy secasvar data into sadb_address.
3833 */
3834 static struct mbuf *
key_setsadbsa(struct secasvar * sav)3835 key_setsadbsa(struct secasvar *sav)
3836 {
3837 struct mbuf *m;
3838 struct sadb_sa *p;
3839 int len;
3840
3841 len = PFKEY_ALIGN8(sizeof(struct sadb_sa));
3842 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3843 if (m == NULL)
3844 return (NULL);
3845 m_align(m, len);
3846 m->m_len = len;
3847 p = mtod(m, struct sadb_sa *);
3848 bzero(p, len);
3849 p->sadb_sa_len = PFKEY_UNIT64(len);
3850 p->sadb_sa_exttype = SADB_EXT_SA;
3851 p->sadb_sa_spi = sav->spi;
3852 p->sadb_sa_replay = sav->replay ?
3853 (sav->replay->wsize > UINT8_MAX ? UINT8_MAX :
3854 sav->replay->wsize): 0;
3855 p->sadb_sa_state = sav->state;
3856 p->sadb_sa_auth = sav->alg_auth;
3857 p->sadb_sa_encrypt = sav->alg_enc;
3858 p->sadb_sa_flags = sav->flags & SADB_KEY_FLAGS_MAX;
3859 return (m);
3860 }
3861
3862 /*
3863 * set data into sadb_address.
3864 */
3865 static struct mbuf *
key_setsadbaddr(u_int16_t exttype,const struct sockaddr * saddr,u_int8_t prefixlen,u_int16_t ul_proto)3866 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr,
3867 u_int8_t prefixlen, u_int16_t ul_proto)
3868 {
3869 struct mbuf *m;
3870 struct sadb_address *p;
3871 size_t len;
3872
3873 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) +
3874 PFKEY_ALIGN8(saddr->sa_len);
3875 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3876 if (m == NULL)
3877 return (NULL);
3878 m_align(m, len);
3879 m->m_len = len;
3880 p = mtod(m, struct sadb_address *);
3881
3882 bzero(p, len);
3883 p->sadb_address_len = PFKEY_UNIT64(len);
3884 p->sadb_address_exttype = exttype;
3885 p->sadb_address_proto = ul_proto;
3886 if (prefixlen == FULLMASK) {
3887 switch (saddr->sa_family) {
3888 case AF_INET:
3889 prefixlen = sizeof(struct in_addr) << 3;
3890 break;
3891 case AF_INET6:
3892 prefixlen = sizeof(struct in6_addr) << 3;
3893 break;
3894 default:
3895 ; /*XXX*/
3896 }
3897 }
3898 p->sadb_address_prefixlen = prefixlen;
3899 p->sadb_address_reserved = 0;
3900
3901 bcopy(saddr,
3902 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)),
3903 saddr->sa_len);
3904
3905 return m;
3906 }
3907
3908 /*
3909 * set data into sadb_x_sa2.
3910 */
3911 static struct mbuf *
key_setsadbxsa2(u_int8_t mode,u_int32_t seq,u_int32_t reqid)3912 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid)
3913 {
3914 struct mbuf *m;
3915 struct sadb_x_sa2 *p;
3916 size_t len;
3917
3918 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2));
3919 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3920 if (m == NULL)
3921 return (NULL);
3922 m_align(m, len);
3923 m->m_len = len;
3924 p = mtod(m, struct sadb_x_sa2 *);
3925
3926 bzero(p, len);
3927 p->sadb_x_sa2_len = PFKEY_UNIT64(len);
3928 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
3929 p->sadb_x_sa2_mode = mode;
3930 p->sadb_x_sa2_reserved1 = 0;
3931 p->sadb_x_sa2_reserved2 = 0;
3932 p->sadb_x_sa2_sequence = seq;
3933 p->sadb_x_sa2_reqid = reqid;
3934
3935 return m;
3936 }
3937
3938 /*
3939 * Set data into sadb_x_sa_replay.
3940 */
3941 static struct mbuf *
key_setsadbxsareplay(u_int32_t replay)3942 key_setsadbxsareplay(u_int32_t replay)
3943 {
3944 struct mbuf *m;
3945 struct sadb_x_sa_replay *p;
3946 size_t len;
3947
3948 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa_replay));
3949 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3950 if (m == NULL)
3951 return (NULL);
3952 m_align(m, len);
3953 m->m_len = len;
3954 p = mtod(m, struct sadb_x_sa_replay *);
3955
3956 bzero(p, len);
3957 p->sadb_x_sa_replay_len = PFKEY_UNIT64(len);
3958 p->sadb_x_sa_replay_exttype = SADB_X_EXT_SA_REPLAY;
3959 p->sadb_x_sa_replay_replay = (replay << 3);
3960
3961 return m;
3962 }
3963
3964 /*
3965 * Set a type in sadb_x_nat_t_type.
3966 */
3967 static struct mbuf *
key_setsadbxtype(u_int16_t type)3968 key_setsadbxtype(u_int16_t type)
3969 {
3970 struct mbuf *m;
3971 size_t len;
3972 struct sadb_x_nat_t_type *p;
3973
3974 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type));
3975
3976 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3977 if (m == NULL)
3978 return (NULL);
3979 m_align(m, len);
3980 m->m_len = len;
3981 p = mtod(m, struct sadb_x_nat_t_type *);
3982
3983 bzero(p, len);
3984 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len);
3985 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
3986 p->sadb_x_nat_t_type_type = type;
3987
3988 return (m);
3989 }
3990 /*
3991 * Set a port in sadb_x_nat_t_port.
3992 * In contrast to default RFC 2367 behaviour, port is in network byte order.
3993 */
3994 static struct mbuf *
key_setsadbxport(u_int16_t port,u_int16_t type)3995 key_setsadbxport(u_int16_t port, u_int16_t type)
3996 {
3997 struct mbuf *m;
3998 size_t len;
3999 struct sadb_x_nat_t_port *p;
4000
4001 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port));
4002
4003 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
4004 if (m == NULL)
4005 return (NULL);
4006 m_align(m, len);
4007 m->m_len = len;
4008 p = mtod(m, struct sadb_x_nat_t_port *);
4009
4010 bzero(p, len);
4011 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len);
4012 p->sadb_x_nat_t_port_exttype = type;
4013 p->sadb_x_nat_t_port_port = port;
4014
4015 return (m);
4016 }
4017
4018 /*
4019 * Get port from sockaddr. Port is in network byte order.
4020 */
4021 uint16_t
key_portfromsaddr(struct sockaddr * sa)4022 key_portfromsaddr(struct sockaddr *sa)
4023 {
4024
4025 switch (sa->sa_family) {
4026 #ifdef INET
4027 case AF_INET:
4028 return ((struct sockaddr_in *)sa)->sin_port;
4029 #endif
4030 #ifdef INET6
4031 case AF_INET6:
4032 return ((struct sockaddr_in6 *)sa)->sin6_port;
4033 #endif
4034 }
4035 return (0);
4036 }
4037
4038 /*
4039 * Set port in struct sockaddr. Port is in network byte order.
4040 */
4041 void
key_porttosaddr(struct sockaddr * sa,uint16_t port)4042 key_porttosaddr(struct sockaddr *sa, uint16_t port)
4043 {
4044
4045 switch (sa->sa_family) {
4046 #ifdef INET
4047 case AF_INET:
4048 ((struct sockaddr_in *)sa)->sin_port = port;
4049 break;
4050 #endif
4051 #ifdef INET6
4052 case AF_INET6:
4053 ((struct sockaddr_in6 *)sa)->sin6_port = port;
4054 break;
4055 #endif
4056 default:
4057 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n",
4058 __func__, sa->sa_family));
4059 break;
4060 }
4061 }
4062
4063 /*
4064 * set data into sadb_x_policy
4065 */
4066 static struct mbuf *
key_setsadbxpolicy(u_int16_t type,u_int8_t dir,u_int32_t id,u_int32_t priority)4067 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id, u_int32_t priority)
4068 {
4069 struct mbuf *m;
4070 struct sadb_x_policy *p;
4071 size_t len;
4072
4073 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy));
4074 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
4075 if (m == NULL)
4076 return (NULL);
4077 m_align(m, len);
4078 m->m_len = len;
4079 p = mtod(m, struct sadb_x_policy *);
4080
4081 bzero(p, len);
4082 p->sadb_x_policy_len = PFKEY_UNIT64(len);
4083 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
4084 p->sadb_x_policy_type = type;
4085 p->sadb_x_policy_dir = dir;
4086 p->sadb_x_policy_id = id;
4087 p->sadb_x_policy_priority = priority;
4088
4089 return m;
4090 }
4091
4092 /* %%% utilities */
4093 /* Take a key message (sadb_key) from the socket and turn it into one
4094 * of the kernel's key structures (seckey).
4095 *
4096 * IN: pointer to the src
4097 * OUT: NULL no more memory
4098 */
4099 struct seckey *
key_dup_keymsg(const struct sadb_key * src,size_t len,struct malloc_type * type)4100 key_dup_keymsg(const struct sadb_key *src, size_t len,
4101 struct malloc_type *type)
4102 {
4103 struct seckey *dst;
4104
4105 dst = malloc(sizeof(*dst), type, M_NOWAIT);
4106 if (dst != NULL) {
4107 dst->bits = src->sadb_key_bits;
4108 dst->key_data = malloc(len, type, M_NOWAIT);
4109 if (dst->key_data != NULL) {
4110 bcopy((const char *)(src + 1), dst->key_data, len);
4111 } else {
4112 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
4113 __func__));
4114 free(dst, type);
4115 dst = NULL;
4116 }
4117 } else {
4118 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
4119 __func__));
4120 }
4121 return (dst);
4122 }
4123
4124 /* Take a lifetime message (sadb_lifetime) passed in on a socket and
4125 * turn it into one of the kernel's lifetime structures (seclifetime).
4126 *
4127 * IN: pointer to the destination, source and malloc type
4128 * OUT: NULL, no more memory
4129 */
4130
4131 static struct seclifetime *
key_dup_lifemsg(const struct sadb_lifetime * src,struct malloc_type * type)4132 key_dup_lifemsg(const struct sadb_lifetime *src, struct malloc_type *type)
4133 {
4134 struct seclifetime *dst;
4135
4136 dst = malloc(sizeof(*dst), type, M_NOWAIT);
4137 if (dst == NULL) {
4138 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
4139 return (NULL);
4140 }
4141 dst->allocations = src->sadb_lifetime_allocations;
4142 dst->bytes = src->sadb_lifetime_bytes;
4143 dst->addtime = src->sadb_lifetime_addtime;
4144 dst->usetime = src->sadb_lifetime_usetime;
4145 return (dst);
4146 }
4147
4148 /*
4149 * compare two secasindex structure.
4150 * flag can specify to compare 2 saidxes.
4151 * compare two secasindex structure without both mode and reqid.
4152 * don't compare port.
4153 * IN:
4154 * saidx0: source, it can be in SAD.
4155 * saidx1: object.
4156 * OUT:
4157 * 1 : equal
4158 * 0 : not equal
4159 */
4160 static int
key_cmpsaidx(const struct secasindex * saidx0,const struct secasindex * saidx1,int flag)4161 key_cmpsaidx(const struct secasindex *saidx0, const struct secasindex *saidx1,
4162 int flag)
4163 {
4164
4165 /* sanity */
4166 if (saidx0 == NULL && saidx1 == NULL)
4167 return 1;
4168
4169 if (saidx0 == NULL || saidx1 == NULL)
4170 return 0;
4171
4172 if (saidx0->proto != saidx1->proto)
4173 return 0;
4174
4175 if (flag == CMP_EXACTLY) {
4176 if (saidx0->mode != saidx1->mode)
4177 return 0;
4178 if (saidx0->reqid != saidx1->reqid)
4179 return 0;
4180 if (bcmp(&saidx0->src, &saidx1->src,
4181 saidx0->src.sa.sa_len) != 0 ||
4182 bcmp(&saidx0->dst, &saidx1->dst,
4183 saidx0->dst.sa.sa_len) != 0)
4184 return 0;
4185 } else {
4186 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */
4187 if (flag == CMP_MODE_REQID || flag == CMP_REQID) {
4188 /*
4189 * If reqid of SPD is non-zero, unique SA is required.
4190 * The result must be of same reqid in this case.
4191 */
4192 if (saidx1->reqid != 0 &&
4193 saidx0->reqid != saidx1->reqid)
4194 return 0;
4195 }
4196
4197 if (flag == CMP_MODE_REQID) {
4198 if (saidx0->mode != IPSEC_MODE_ANY
4199 && saidx0->mode != saidx1->mode)
4200 return 0;
4201 }
4202
4203 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0)
4204 return 0;
4205 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0)
4206 return 0;
4207 }
4208
4209 return 1;
4210 }
4211
4212 /*
4213 * compare two secindex structure exactly.
4214 * IN:
4215 * spidx0: source, it is often in SPD.
4216 * spidx1: object, it is often from PFKEY message.
4217 * OUT:
4218 * 1 : equal
4219 * 0 : not equal
4220 */
4221 static int
key_cmpspidx_exactly(struct secpolicyindex * spidx0,struct secpolicyindex * spidx1)4222 key_cmpspidx_exactly(struct secpolicyindex *spidx0,
4223 struct secpolicyindex *spidx1)
4224 {
4225 /* sanity */
4226 if (spidx0 == NULL && spidx1 == NULL)
4227 return 1;
4228
4229 if (spidx0 == NULL || spidx1 == NULL)
4230 return 0;
4231
4232 if (spidx0->prefs != spidx1->prefs
4233 || spidx0->prefd != spidx1->prefd
4234 || spidx0->ul_proto != spidx1->ul_proto
4235 || spidx0->dir != spidx1->dir)
4236 return 0;
4237
4238 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 &&
4239 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0;
4240 }
4241
4242 /*
4243 * compare two secindex structure with mask.
4244 * IN:
4245 * spidx0: source, it is often in SPD.
4246 * spidx1: object, it is often from IP header.
4247 * OUT:
4248 * 1 : equal
4249 * 0 : not equal
4250 */
4251 static int
key_cmpspidx_withmask(struct secpolicyindex * spidx0,struct secpolicyindex * spidx1)4252 key_cmpspidx_withmask(struct secpolicyindex *spidx0,
4253 struct secpolicyindex *spidx1)
4254 {
4255 /* sanity */
4256 if (spidx0 == NULL && spidx1 == NULL)
4257 return 1;
4258
4259 if (spidx0 == NULL || spidx1 == NULL)
4260 return 0;
4261
4262 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family ||
4263 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family ||
4264 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len ||
4265 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len)
4266 return 0;
4267
4268 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */
4269 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY
4270 && spidx0->ul_proto != spidx1->ul_proto)
4271 return 0;
4272
4273 switch (spidx0->src.sa.sa_family) {
4274 case AF_INET:
4275 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY
4276 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port)
4277 return 0;
4278 if (!key_bbcmp(&spidx0->src.sin.sin_addr,
4279 &spidx1->src.sin.sin_addr, spidx0->prefs))
4280 return 0;
4281 break;
4282 case AF_INET6:
4283 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY
4284 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port)
4285 return 0;
4286 /*
4287 * scope_id check. if sin6_scope_id is 0, we regard it
4288 * as a wildcard scope, which matches any scope zone ID.
4289 */
4290 if (spidx0->src.sin6.sin6_scope_id &&
4291 spidx1->src.sin6.sin6_scope_id &&
4292 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id)
4293 return 0;
4294 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr,
4295 &spidx1->src.sin6.sin6_addr, spidx0->prefs))
4296 return 0;
4297 break;
4298 default:
4299 /* XXX */
4300 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0)
4301 return 0;
4302 break;
4303 }
4304
4305 switch (spidx0->dst.sa.sa_family) {
4306 case AF_INET:
4307 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY
4308 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port)
4309 return 0;
4310 if (!key_bbcmp(&spidx0->dst.sin.sin_addr,
4311 &spidx1->dst.sin.sin_addr, spidx0->prefd))
4312 return 0;
4313 break;
4314 case AF_INET6:
4315 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY
4316 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port)
4317 return 0;
4318 /*
4319 * scope_id check. if sin6_scope_id is 0, we regard it
4320 * as a wildcard scope, which matches any scope zone ID.
4321 */
4322 if (spidx0->dst.sin6.sin6_scope_id &&
4323 spidx1->dst.sin6.sin6_scope_id &&
4324 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id)
4325 return 0;
4326 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr,
4327 &spidx1->dst.sin6.sin6_addr, spidx0->prefd))
4328 return 0;
4329 break;
4330 default:
4331 /* XXX */
4332 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0)
4333 return 0;
4334 break;
4335 }
4336
4337 /* XXX Do we check other field ? e.g. flowinfo */
4338
4339 return 1;
4340 }
4341
4342 #ifdef satosin
4343 #undef satosin
4344 #endif
4345 #define satosin(s) ((const struct sockaddr_in *)s)
4346 #ifdef satosin6
4347 #undef satosin6
4348 #endif
4349 #define satosin6(s) ((const struct sockaddr_in6 *)s)
4350 /* returns 0 on match */
4351 int
key_sockaddrcmp(const struct sockaddr * sa1,const struct sockaddr * sa2,int port)4352 key_sockaddrcmp(const struct sockaddr *sa1, const struct sockaddr *sa2,
4353 int port)
4354 {
4355 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
4356 return 1;
4357
4358 switch (sa1->sa_family) {
4359 #ifdef INET
4360 case AF_INET:
4361 if (sa1->sa_len != sizeof(struct sockaddr_in))
4362 return 1;
4363 if (satosin(sa1)->sin_addr.s_addr !=
4364 satosin(sa2)->sin_addr.s_addr) {
4365 return 1;
4366 }
4367 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port)
4368 return 1;
4369 break;
4370 #endif
4371 #ifdef INET6
4372 case AF_INET6:
4373 if (sa1->sa_len != sizeof(struct sockaddr_in6))
4374 return 1; /*EINVAL*/
4375 if (satosin6(sa1)->sin6_scope_id !=
4376 satosin6(sa2)->sin6_scope_id) {
4377 return 1;
4378 }
4379 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr,
4380 &satosin6(sa2)->sin6_addr)) {
4381 return 1;
4382 }
4383 if (port &&
4384 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) {
4385 return 1;
4386 }
4387 break;
4388 #endif
4389 default:
4390 if (bcmp(sa1, sa2, sa1->sa_len) != 0)
4391 return 1;
4392 break;
4393 }
4394
4395 return 0;
4396 }
4397
4398 /* returns 0 on match */
4399 int
key_sockaddrcmp_withmask(const struct sockaddr * sa1,const struct sockaddr * sa2,size_t mask)4400 key_sockaddrcmp_withmask(const struct sockaddr *sa1,
4401 const struct sockaddr *sa2, size_t mask)
4402 {
4403 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
4404 return (1);
4405
4406 switch (sa1->sa_family) {
4407 #ifdef INET
4408 case AF_INET:
4409 return (!key_bbcmp(&satosin(sa1)->sin_addr,
4410 &satosin(sa2)->sin_addr, mask));
4411 #endif
4412 #ifdef INET6
4413 case AF_INET6:
4414 if (satosin6(sa1)->sin6_scope_id !=
4415 satosin6(sa2)->sin6_scope_id)
4416 return (1);
4417 return (!key_bbcmp(&satosin6(sa1)->sin6_addr,
4418 &satosin6(sa2)->sin6_addr, mask));
4419 #endif
4420 }
4421 return (1);
4422 }
4423 #undef satosin
4424 #undef satosin6
4425
4426 /*
4427 * compare two buffers with mask.
4428 * IN:
4429 * addr1: source
4430 * addr2: object
4431 * bits: Number of bits to compare
4432 * OUT:
4433 * 1 : equal
4434 * 0 : not equal
4435 */
4436 static int
key_bbcmp(const void * a1,const void * a2,u_int bits)4437 key_bbcmp(const void *a1, const void *a2, u_int bits)
4438 {
4439 const unsigned char *p1 = a1;
4440 const unsigned char *p2 = a2;
4441
4442 /* XXX: This could be considerably faster if we compare a word
4443 * at a time, but it is complicated on LSB Endian machines */
4444
4445 /* Handle null pointers */
4446 if (p1 == NULL || p2 == NULL)
4447 return (p1 == p2);
4448
4449 while (bits >= 8) {
4450 if (*p1++ != *p2++)
4451 return 0;
4452 bits -= 8;
4453 }
4454
4455 if (bits > 0) {
4456 u_int8_t mask = ~((1<<(8-bits))-1);
4457 if ((*p1 & mask) != (*p2 & mask))
4458 return 0;
4459 }
4460 return 1; /* Match! */
4461 }
4462
4463 static void
key_flush_spd(time_t now)4464 key_flush_spd(time_t now)
4465 {
4466 SPTREE_RLOCK_TRACKER;
4467 struct secpolicy_list drainq;
4468 struct secpolicy *sp, *nextsp;
4469 u_int dir;
4470
4471 LIST_INIT(&drainq);
4472 SPTREE_RLOCK();
4473 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
4474 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
4475 if (sp->lifetime == 0 && sp->validtime == 0)
4476 continue;
4477 if ((sp->lifetime &&
4478 now - sp->created > sp->lifetime) ||
4479 (sp->validtime &&
4480 now - sp->lastused > sp->validtime)) {
4481 /* Hold extra reference to send SPDEXPIRE */
4482 SP_ADDREF(sp);
4483 LIST_INSERT_HEAD(&drainq, sp, drainq);
4484 }
4485 }
4486 }
4487 SPTREE_RUNLOCK();
4488 if (LIST_EMPTY(&drainq))
4489 return;
4490
4491 SPTREE_WLOCK();
4492 sp = LIST_FIRST(&drainq);
4493 while (sp != NULL) {
4494 nextsp = LIST_NEXT(sp, drainq);
4495 /* Check that SP is still linked */
4496 if (sp->state != IPSEC_SPSTATE_ALIVE) {
4497 LIST_REMOVE(sp, drainq);
4498 key_freesp(&sp); /* release extra reference */
4499 sp = nextsp;
4500 continue;
4501 }
4502 TAILQ_REMOVE(&V_sptree[sp->spidx.dir], sp, chain);
4503 V_spd_size--;
4504 LIST_REMOVE(sp, idhash);
4505 sp->state = IPSEC_SPSTATE_DEAD;
4506 sp = nextsp;
4507 }
4508 V_sp_genid++;
4509 SPTREE_WUNLOCK();
4510 if (SPDCACHE_ENABLED())
4511 spdcache_clear();
4512
4513 sp = LIST_FIRST(&drainq);
4514 while (sp != NULL) {
4515 nextsp = LIST_NEXT(sp, drainq);
4516 key_spdexpire(sp);
4517 key_freesp(&sp); /* release extra reference */
4518 key_freesp(&sp); /* release last reference */
4519 sp = nextsp;
4520 }
4521 }
4522
4523 static void
key_flush_sad(time_t now)4524 key_flush_sad(time_t now)
4525 {
4526 SAHTREE_RLOCK_TRACKER;
4527 struct secashead_list emptyq;
4528 struct secasvar_list drainq, hexpireq, sexpireq, freeq;
4529 struct secashead *sah, *nextsah;
4530 struct secasvar *sav, *nextsav;
4531
4532 SECASVAR_RLOCK_TRACKER;
4533
4534 LIST_INIT(&drainq);
4535 LIST_INIT(&hexpireq);
4536 LIST_INIT(&sexpireq);
4537 LIST_INIT(&emptyq);
4538
4539 SAHTREE_RLOCK();
4540 TAILQ_FOREACH(sah, &V_sahtree, chain) {
4541 /* Check for empty SAH */
4542 if (TAILQ_EMPTY(&sah->savtree_larval) &&
4543 TAILQ_EMPTY(&sah->savtree_alive)) {
4544 SAH_ADDREF(sah);
4545 LIST_INSERT_HEAD(&emptyq, sah, drainq);
4546 continue;
4547 }
4548 /* Add all stale LARVAL SAs into drainq */
4549 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
4550 if (now - sav->created < V_key_larval_lifetime)
4551 continue;
4552 SAV_ADDREF(sav);
4553 LIST_INSERT_HEAD(&drainq, sav, drainq);
4554 }
4555 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
4556 /* lifetimes aren't specified */
4557 if (sav->lft_h == NULL)
4558 continue;
4559 SECASVAR_RLOCK(sav);
4560 /*
4561 * Check again with lock held, because it may
4562 * be updated by SADB_UPDATE.
4563 */
4564 if (sav->lft_h == NULL) {
4565 SECASVAR_RUNLOCK(sav);
4566 continue;
4567 }
4568 /*
4569 * RFC 2367:
4570 * HARD lifetimes MUST take precedence over SOFT
4571 * lifetimes, meaning if the HARD and SOFT lifetimes
4572 * are the same, the HARD lifetime will appear on the
4573 * EXPIRE message.
4574 */
4575 /* check HARD lifetime */
4576 if ((sav->lft_h->addtime != 0 &&
4577 now - sav->created > sav->lft_h->addtime) ||
4578 (sav->lft_h->usetime != 0 && sav->firstused &&
4579 now - sav->firstused > sav->lft_h->usetime) ||
4580 (sav->lft_h->bytes != 0 && counter_u64_fetch(
4581 sav->lft_c_bytes) > sav->lft_h->bytes)) {
4582 SECASVAR_RUNLOCK(sav);
4583 SAV_ADDREF(sav);
4584 LIST_INSERT_HEAD(&hexpireq, sav, drainq);
4585 continue;
4586 }
4587 /* check SOFT lifetime (only for MATURE SAs) */
4588 if (sav->state == SADB_SASTATE_MATURE && (
4589 (sav->lft_s->addtime != 0 &&
4590 now - sav->created > sav->lft_s->addtime) ||
4591 (sav->lft_s->usetime != 0 && sav->firstused &&
4592 now - sav->firstused > sav->lft_s->usetime) ||
4593 (sav->lft_s->bytes != 0 && counter_u64_fetch(
4594 sav->lft_c_bytes) > sav->lft_s->bytes) ||
4595 (!(sav->flags & SADB_X_SAFLAGS_ESN) &&
4596 (sav->replay != NULL) && (
4597 (sav->replay->count > UINT32_80PCT) ||
4598 (sav->replay->last > UINT32_80PCT))))) {
4599 SECASVAR_RUNLOCK(sav);
4600 SAV_ADDREF(sav);
4601 LIST_INSERT_HEAD(&sexpireq, sav, drainq);
4602 continue;
4603 }
4604 SECASVAR_RUNLOCK(sav);
4605 }
4606 }
4607 SAHTREE_RUNLOCK();
4608
4609 if (LIST_EMPTY(&emptyq) && LIST_EMPTY(&drainq) &&
4610 LIST_EMPTY(&hexpireq) && LIST_EMPTY(&sexpireq))
4611 return;
4612
4613 LIST_INIT(&freeq);
4614 SAHTREE_WLOCK();
4615 /* Unlink stale LARVAL SAs */
4616 sav = LIST_FIRST(&drainq);
4617 while (sav != NULL) {
4618 nextsav = LIST_NEXT(sav, drainq);
4619 /* Check that SA is still LARVAL */
4620 if (sav->state != SADB_SASTATE_LARVAL) {
4621 LIST_REMOVE(sav, drainq);
4622 LIST_INSERT_HEAD(&freeq, sav, drainq);
4623 sav = nextsav;
4624 continue;
4625 }
4626 TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
4627 LIST_REMOVE(sav, spihash);
4628 sav->state = SADB_SASTATE_DEAD;
4629 sav = nextsav;
4630 }
4631 /* Unlink all SAs with expired HARD lifetime */
4632 sav = LIST_FIRST(&hexpireq);
4633 while (sav != NULL) {
4634 nextsav = LIST_NEXT(sav, drainq);
4635 /* Check that SA is not unlinked */
4636 if (sav->state == SADB_SASTATE_DEAD) {
4637 LIST_REMOVE(sav, drainq);
4638 LIST_INSERT_HEAD(&freeq, sav, drainq);
4639 sav = nextsav;
4640 continue;
4641 }
4642 TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
4643 LIST_REMOVE(sav, spihash);
4644 sav->state = SADB_SASTATE_DEAD;
4645 sav = nextsav;
4646 }
4647 /* Mark all SAs with expired SOFT lifetime as DYING */
4648 sav = LIST_FIRST(&sexpireq);
4649 while (sav != NULL) {
4650 nextsav = LIST_NEXT(sav, drainq);
4651 /* Check that SA is not unlinked */
4652 if (sav->state == SADB_SASTATE_DEAD) {
4653 LIST_REMOVE(sav, drainq);
4654 LIST_INSERT_HEAD(&freeq, sav, drainq);
4655 sav = nextsav;
4656 continue;
4657 }
4658 /*
4659 * NOTE: this doesn't change SA order in the chain.
4660 */
4661 sav->state = SADB_SASTATE_DYING;
4662 sav = nextsav;
4663 }
4664 /* Unlink empty SAHs */
4665 sah = LIST_FIRST(&emptyq);
4666 while (sah != NULL) {
4667 nextsah = LIST_NEXT(sah, drainq);
4668 /* Check that SAH is still empty and not unlinked */
4669 if (sah->state == SADB_SASTATE_DEAD ||
4670 !TAILQ_EMPTY(&sah->savtree_larval) ||
4671 !TAILQ_EMPTY(&sah->savtree_alive)) {
4672 LIST_REMOVE(sah, drainq);
4673 key_freesah(&sah); /* release extra reference */
4674 sah = nextsah;
4675 continue;
4676 }
4677 TAILQ_REMOVE(&V_sahtree, sah, chain);
4678 LIST_REMOVE(sah, addrhash);
4679 sah->state = SADB_SASTATE_DEAD;
4680 sah = nextsah;
4681 }
4682 SAHTREE_WUNLOCK();
4683
4684 /* Send SPDEXPIRE messages */
4685 sav = LIST_FIRST(&hexpireq);
4686 while (sav != NULL) {
4687 nextsav = LIST_NEXT(sav, drainq);
4688 key_expire(sav, 1);
4689 key_freesah(&sav->sah); /* release reference from SAV */
4690 key_freesav(&sav); /* release extra reference */
4691 key_freesav(&sav); /* release last reference */
4692 sav = nextsav;
4693 }
4694 sav = LIST_FIRST(&sexpireq);
4695 while (sav != NULL) {
4696 nextsav = LIST_NEXT(sav, drainq);
4697 key_expire(sav, 0);
4698 key_freesav(&sav); /* release extra reference */
4699 sav = nextsav;
4700 }
4701 /* Free stale LARVAL SAs */
4702 sav = LIST_FIRST(&drainq);
4703 while (sav != NULL) {
4704 nextsav = LIST_NEXT(sav, drainq);
4705 key_freesah(&sav->sah); /* release reference from SAV */
4706 key_freesav(&sav); /* release extra reference */
4707 key_freesav(&sav); /* release last reference */
4708 sav = nextsav;
4709 }
4710 /* Free SAs that were unlinked/changed by someone else */
4711 sav = LIST_FIRST(&freeq);
4712 while (sav != NULL) {
4713 nextsav = LIST_NEXT(sav, drainq);
4714 key_freesav(&sav); /* release extra reference */
4715 sav = nextsav;
4716 }
4717 /* Free empty SAH */
4718 sah = LIST_FIRST(&emptyq);
4719 while (sah != NULL) {
4720 nextsah = LIST_NEXT(sah, drainq);
4721 key_freesah(&sah); /* release extra reference */
4722 key_freesah(&sah); /* release last reference */
4723 sah = nextsah;
4724 }
4725 }
4726
4727 static void
key_flush_acq(time_t now)4728 key_flush_acq(time_t now)
4729 {
4730 struct secacq *acq, *nextacq;
4731
4732 /* ACQ tree */
4733 ACQ_LOCK();
4734 acq = LIST_FIRST(&V_acqtree);
4735 while (acq != NULL) {
4736 nextacq = LIST_NEXT(acq, chain);
4737 if (now - acq->created > V_key_blockacq_lifetime) {
4738 LIST_REMOVE(acq, chain);
4739 LIST_REMOVE(acq, addrhash);
4740 LIST_REMOVE(acq, seqhash);
4741 free(acq, M_IPSEC_SAQ);
4742 }
4743 acq = nextacq;
4744 }
4745 ACQ_UNLOCK();
4746 }
4747
4748 static void
key_flush_spacq(time_t now)4749 key_flush_spacq(time_t now)
4750 {
4751 struct secspacq *acq, *nextacq;
4752
4753 /* SP ACQ tree */
4754 SPACQ_LOCK();
4755 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) {
4756 nextacq = LIST_NEXT(acq, chain);
4757 if (now - acq->created > V_key_blockacq_lifetime
4758 && __LIST_CHAINED(acq)) {
4759 LIST_REMOVE(acq, chain);
4760 free(acq, M_IPSEC_SAQ);
4761 }
4762 }
4763 SPACQ_UNLOCK();
4764 }
4765
4766 /*
4767 * time handler.
4768 * scanning SPD and SAD to check status for each entries,
4769 * and do to remove or to expire.
4770 * XXX: year 2038 problem may remain.
4771 */
4772 static void
key_timehandler(void * arg)4773 key_timehandler(void *arg)
4774 {
4775 VNET_ITERATOR_DECL(vnet_iter);
4776 time_t now = time_second;
4777
4778 VNET_LIST_RLOCK_NOSLEEP();
4779 VNET_FOREACH(vnet_iter) {
4780 CURVNET_SET(vnet_iter);
4781 key_flush_spd(now);
4782 key_flush_sad(now);
4783 key_flush_acq(now);
4784 key_flush_spacq(now);
4785 CURVNET_RESTORE();
4786 }
4787 VNET_LIST_RUNLOCK_NOSLEEP();
4788
4789 #ifndef IPSEC_DEBUG2
4790 /* do exchange to tick time !! */
4791 callout_schedule(&key_timer, hz);
4792 #endif /* IPSEC_DEBUG2 */
4793 }
4794
4795 u_long
key_random(void)4796 key_random(void)
4797 {
4798 u_long value;
4799
4800 arc4random_buf(&value, sizeof(value));
4801 return value;
4802 }
4803
4804 /*
4805 * map SADB_SATYPE_* to IPPROTO_*.
4806 * if satype == SADB_SATYPE then satype is mapped to ~0.
4807 * OUT:
4808 * 0: invalid satype.
4809 */
4810 static uint8_t
key_satype2proto(uint8_t satype)4811 key_satype2proto(uint8_t satype)
4812 {
4813 switch (satype) {
4814 case SADB_SATYPE_UNSPEC:
4815 return IPSEC_PROTO_ANY;
4816 case SADB_SATYPE_AH:
4817 return IPPROTO_AH;
4818 case SADB_SATYPE_ESP:
4819 return IPPROTO_ESP;
4820 case SADB_X_SATYPE_IPCOMP:
4821 return IPPROTO_IPCOMP;
4822 case SADB_X_SATYPE_TCPSIGNATURE:
4823 return IPPROTO_TCP;
4824 default:
4825 return 0;
4826 }
4827 /* NOTREACHED */
4828 }
4829
4830 /*
4831 * map IPPROTO_* to SADB_SATYPE_*
4832 * OUT:
4833 * 0: invalid protocol type.
4834 */
4835 static uint8_t
key_proto2satype(uint8_t proto)4836 key_proto2satype(uint8_t proto)
4837 {
4838 switch (proto) {
4839 case IPPROTO_AH:
4840 return SADB_SATYPE_AH;
4841 case IPPROTO_ESP:
4842 return SADB_SATYPE_ESP;
4843 case IPPROTO_IPCOMP:
4844 return SADB_X_SATYPE_IPCOMP;
4845 case IPPROTO_TCP:
4846 return SADB_X_SATYPE_TCPSIGNATURE;
4847 default:
4848 return 0;
4849 }
4850 /* NOTREACHED */
4851 }
4852
4853 /* %%% PF_KEY */
4854 /*
4855 * SADB_GETSPI processing is to receive
4856 * <base, (SA2), src address, dst address, (SPI range)>
4857 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND
4858 * tree with the status of LARVAL, and send
4859 * <base, SA(*), address(SD)>
4860 * to the IKMPd.
4861 *
4862 * IN: mhp: pointer to the pointer to each header.
4863 * OUT: NULL if fail.
4864 * other if success, return pointer to the message to send.
4865 */
4866 static int
key_getspi(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)4867 key_getspi(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4868 {
4869 struct secasindex saidx;
4870 struct sadb_address *src0, *dst0;
4871 struct secasvar *sav;
4872 uint32_t reqid, spi;
4873 int error;
4874 uint8_t mode, proto;
4875
4876 IPSEC_ASSERT(so != NULL, ("null socket"));
4877 IPSEC_ASSERT(m != NULL, ("null mbuf"));
4878 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
4879 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
4880
4881 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
4882 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST)
4883 #ifdef PFKEY_STRICT_CHECKS
4884 || SADB_CHECKHDR(mhp, SADB_EXT_SPIRANGE)
4885 #endif
4886 ) {
4887 ipseclog((LOG_DEBUG,
4888 "%s: invalid message: missing required header.\n",
4889 __func__));
4890 error = EINVAL;
4891 goto fail;
4892 }
4893 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
4894 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)
4895 #ifdef PFKEY_STRICT_CHECKS
4896 || SADB_CHECKLEN(mhp, SADB_EXT_SPIRANGE)
4897 #endif
4898 ) {
4899 ipseclog((LOG_DEBUG,
4900 "%s: invalid message: wrong header size.\n", __func__));
4901 error = EINVAL;
4902 goto fail;
4903 }
4904 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
4905 mode = IPSEC_MODE_ANY;
4906 reqid = 0;
4907 } else {
4908 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
4909 ipseclog((LOG_DEBUG,
4910 "%s: invalid message: wrong header size.\n",
4911 __func__));
4912 error = EINVAL;
4913 goto fail;
4914 }
4915 mode = ((struct sadb_x_sa2 *)
4916 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4917 reqid = ((struct sadb_x_sa2 *)
4918 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4919 }
4920
4921 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4922 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4923
4924 /* map satype to proto */
4925 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4926 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
4927 __func__));
4928 error = EINVAL;
4929 goto fail;
4930 }
4931 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
4932 (struct sockaddr *)(dst0 + 1));
4933 if (error != 0) {
4934 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
4935 error = EINVAL;
4936 goto fail;
4937 }
4938 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4939
4940 /* SPI allocation */
4941 SPI_ALLOC_LOCK();
4942 spi = key_do_getnewspi(
4943 (struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], &saidx);
4944 if (spi == 0) {
4945 /*
4946 * Requested SPI or SPI range is not available or
4947 * already used.
4948 */
4949 SPI_ALLOC_UNLOCK();
4950 error = EEXIST;
4951 goto fail;
4952 }
4953 sav = key_newsav(mhp, &saidx, spi, &error);
4954 SPI_ALLOC_UNLOCK();
4955 if (sav == NULL)
4956 goto fail;
4957
4958 if (sav->seq != 0) {
4959 /*
4960 * RFC2367:
4961 * If the SADB_GETSPI message is in response to a
4962 * kernel-generated SADB_ACQUIRE, the sadb_msg_seq
4963 * MUST be the same as the SADB_ACQUIRE message.
4964 *
4965 * XXXAE: However it doesn't definethe behaviour how to
4966 * check this and what to do if it doesn't match.
4967 * Also what we should do if it matches?
4968 *
4969 * We can compare saidx used in SADB_ACQUIRE with saidx
4970 * used in SADB_GETSPI, but this probably can break
4971 * existing software. For now just warn if it doesn't match.
4972 *
4973 * XXXAE: anyway it looks useless.
4974 */
4975 key_acqdone(&saidx, sav->seq);
4976 }
4977 KEYDBG(KEY_STAMP,
4978 printf("%s: SA(%p)\n", __func__, sav));
4979 KEYDBG(KEY_DATA, kdebug_secasv(sav));
4980
4981 {
4982 struct mbuf *n, *nn;
4983 struct sadb_sa *m_sa;
4984 struct sadb_msg *newmsg;
4985 int off, len;
4986
4987 /* create new sadb_msg to reply. */
4988 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) +
4989 PFKEY_ALIGN8(sizeof(struct sadb_sa));
4990
4991 n = key_mget(len);
4992 if (n == NULL) {
4993 error = ENOBUFS;
4994 goto fail;
4995 }
4996
4997 n->m_len = len;
4998 n->m_next = NULL;
4999 off = 0;
5000
5001 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
5002 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
5003
5004 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off);
5005 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa));
5006 m_sa->sadb_sa_exttype = SADB_EXT_SA;
5007 m_sa->sadb_sa_spi = spi; /* SPI is already in network byte order */
5008 off += PFKEY_ALIGN8(sizeof(struct sadb_sa));
5009
5010 IPSEC_ASSERT(off == len,
5011 ("length inconsistency (off %u len %u)", off, len));
5012
5013 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC,
5014 SADB_EXT_ADDRESS_DST);
5015 if (!n->m_next) {
5016 m_freem(n);
5017 error = ENOBUFS;
5018 goto fail;
5019 }
5020
5021 if (n->m_len < sizeof(struct sadb_msg)) {
5022 n = m_pullup(n, sizeof(struct sadb_msg));
5023 if (n == NULL)
5024 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
5025 }
5026
5027 n->m_pkthdr.len = 0;
5028 for (nn = n; nn; nn = nn->m_next)
5029 n->m_pkthdr.len += nn->m_len;
5030
5031 newmsg = mtod(n, struct sadb_msg *);
5032 newmsg->sadb_msg_seq = sav->seq;
5033 newmsg->sadb_msg_errno = 0;
5034 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
5035
5036 m_freem(m);
5037 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
5038 }
5039
5040 fail:
5041 return (key_senderror(so, m, error));
5042 }
5043
5044 /*
5045 * allocating new SPI
5046 * called by key_getspi().
5047 * OUT:
5048 * 0: failure.
5049 * others: success, SPI in network byte order.
5050 */
5051 static uint32_t
key_do_getnewspi(struct sadb_spirange * spirange,struct secasindex * saidx)5052 key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx)
5053 {
5054 uint32_t min, max, newspi, t;
5055 int tries, limit;
5056
5057 SPI_ALLOC_LOCK_ASSERT();
5058
5059 /* set spi range to allocate */
5060 if (spirange != NULL) {
5061 min = spirange->sadb_spirange_min;
5062 max = spirange->sadb_spirange_max;
5063 } else {
5064 min = V_key_spi_minval;
5065 max = V_key_spi_maxval;
5066 }
5067 /* IPCOMP needs 2-byte SPI */
5068 if (saidx->proto == IPPROTO_IPCOMP) {
5069 if (min >= 0x10000)
5070 min = 0xffff;
5071 if (max >= 0x10000)
5072 max = 0xffff;
5073 if (min > max) {
5074 t = min; min = max; max = t;
5075 }
5076 }
5077
5078 if (min == max) {
5079 if (key_checkspidup(htonl(min))) {
5080 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n",
5081 __func__, min));
5082 return 0;
5083 }
5084
5085 tries = 1;
5086 newspi = min;
5087 } else {
5088 /* init SPI */
5089 newspi = 0;
5090
5091 limit = atomic_load_int(&V_key_spi_trycnt);
5092 /* when requesting to allocate spi ranged */
5093 for (tries = 0; tries < limit; tries++) {
5094 /* generate pseudo-random SPI value ranged. */
5095 newspi = min + (key_random() % (max - min + 1));
5096 if (!key_checkspidup(htonl(newspi)))
5097 break;
5098 }
5099
5100 if (tries == limit || newspi == 0) {
5101 ipseclog((LOG_DEBUG,
5102 "%s: failed to allocate SPI.\n", __func__));
5103 return 0;
5104 }
5105 }
5106
5107 /* statistics */
5108 keystat.getspi_count =
5109 (keystat.getspi_count + tries) / 2;
5110
5111 return (htonl(newspi));
5112 }
5113
5114 /*
5115 * Find TCP-MD5 SA with corresponding secasindex.
5116 * If not found, return NULL and fill SPI with usable value if needed.
5117 */
5118 static struct secasvar *
key_getsav_tcpmd5(struct secasindex * saidx,uint32_t * spi)5119 key_getsav_tcpmd5(struct secasindex *saidx, uint32_t *spi)
5120 {
5121 SAHTREE_RLOCK_TRACKER;
5122 struct secashead *sah;
5123 struct secasvar *sav;
5124
5125 IPSEC_ASSERT(saidx->proto == IPPROTO_TCP, ("wrong proto"));
5126 SAHTREE_RLOCK();
5127 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
5128 if (sah->saidx.proto != IPPROTO_TCP)
5129 continue;
5130 if (!key_sockaddrcmp(&saidx->dst.sa, &sah->saidx.dst.sa, 0) &&
5131 !key_sockaddrcmp(&saidx->src.sa, &sah->saidx.src.sa, 0))
5132 break;
5133 }
5134 if (sah != NULL) {
5135 if (V_key_preferred_oldsa)
5136 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
5137 else
5138 sav = TAILQ_FIRST(&sah->savtree_alive);
5139 if (sav != NULL) {
5140 SAV_ADDREF(sav);
5141 SAHTREE_RUNLOCK();
5142 return (sav);
5143 }
5144 }
5145 if (spi == NULL) {
5146 /* No SPI required */
5147 SAHTREE_RUNLOCK();
5148 return (NULL);
5149 }
5150 /* Check that SPI is unique */
5151 LIST_FOREACH(sav, SAVHASH_HASH(*spi), spihash) {
5152 if (sav->spi == *spi)
5153 break;
5154 }
5155 if (sav == NULL) {
5156 SAHTREE_RUNLOCK();
5157 /* SPI is already unique */
5158 return (NULL);
5159 }
5160 SAHTREE_RUNLOCK();
5161 /* XXX: not optimal */
5162 *spi = key_do_getnewspi(NULL, saidx);
5163 return (NULL);
5164 }
5165
5166 static int
key_updateaddresses(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp,struct secasvar * sav,struct secasindex * saidx)5167 key_updateaddresses(struct socket *so, struct mbuf *m,
5168 const struct sadb_msghdr *mhp, struct secasvar *sav,
5169 struct secasindex *saidx)
5170 {
5171 struct sockaddr *newaddr;
5172 struct secashead *sah;
5173 struct secasvar *newsav, *tmp;
5174 struct mbuf *n;
5175 int error, isnew;
5176
5177 /* Check that we need to change SAH */
5178 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC)) {
5179 newaddr = (struct sockaddr *)(
5180 ((struct sadb_address *)
5181 mhp->ext[SADB_X_EXT_NEW_ADDRESS_SRC]) + 1);
5182 bcopy(newaddr, &saidx->src, newaddr->sa_len);
5183 key_porttosaddr(&saidx->src.sa, 0);
5184 }
5185 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST)) {
5186 newaddr = (struct sockaddr *)(
5187 ((struct sadb_address *)
5188 mhp->ext[SADB_X_EXT_NEW_ADDRESS_DST]) + 1);
5189 bcopy(newaddr, &saidx->dst, newaddr->sa_len);
5190 key_porttosaddr(&saidx->dst.sa, 0);
5191 }
5192 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC) ||
5193 !SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST)) {
5194 error = key_checksockaddrs(&saidx->src.sa, &saidx->dst.sa);
5195 if (error != 0) {
5196 ipseclog((LOG_DEBUG, "%s: invalid new sockaddr.\n",
5197 __func__));
5198 return (error);
5199 }
5200
5201 sah = key_getsah(saidx);
5202 if (sah == NULL) {
5203 /* create a new SA index */
5204 sah = key_newsah(saidx);
5205 if (sah == NULL) {
5206 ipseclog((LOG_DEBUG,
5207 "%s: No more memory.\n", __func__));
5208 return (ENOBUFS);
5209 }
5210 isnew = 2; /* SAH is new */
5211 } else
5212 isnew = 1; /* existing SAH is referenced */
5213 } else {
5214 /*
5215 * src and dst addresses are still the same.
5216 * Do we want to change NAT-T config?
5217 */
5218 if (sav->sah->saidx.proto != IPPROTO_ESP ||
5219 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5220 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_SPORT) ||
5221 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5222 ipseclog((LOG_DEBUG,
5223 "%s: invalid message: missing required header.\n",
5224 __func__));
5225 return (EINVAL);
5226 }
5227 /* We hold reference to SA, thus SAH will be referenced too. */
5228 sah = sav->sah;
5229 isnew = 0;
5230 }
5231
5232 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA,
5233 M_NOWAIT | M_ZERO);
5234 if (newsav == NULL) {
5235 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5236 error = ENOBUFS;
5237 goto fail;
5238 }
5239
5240 /* Clone SA's content into newsav */
5241 SAV_INITREF(newsav);
5242 bcopy(sav, newsav, offsetof(struct secasvar, chain));
5243 /*
5244 * We create new NAT-T config if it is needed.
5245 * Old NAT-T config will be freed by key_cleansav() when
5246 * last reference to SA will be released.
5247 */
5248 newsav->natt = NULL;
5249 newsav->sah = sah;
5250 newsav->state = SADB_SASTATE_MATURE;
5251 error = key_setnatt(newsav, mhp);
5252 if (error != 0)
5253 goto fail;
5254
5255 SAHTREE_WLOCK();
5256 /* Check that SA is still alive */
5257 if (sav->state == SADB_SASTATE_DEAD) {
5258 /* SA was unlinked */
5259 SAHTREE_WUNLOCK();
5260 error = ESRCH;
5261 goto fail;
5262 }
5263
5264 /* Unlink SA from SAH and SPI hash */
5265 IPSEC_ASSERT((sav->flags & SADB_X_EXT_F_CLONED) == 0,
5266 ("SA is already cloned"));
5267 IPSEC_ASSERT(sav->state == SADB_SASTATE_MATURE ||
5268 sav->state == SADB_SASTATE_DYING,
5269 ("Wrong SA state %u\n", sav->state));
5270 TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
5271 LIST_REMOVE(sav, spihash);
5272 sav->state = SADB_SASTATE_DEAD;
5273
5274 /*
5275 * Link new SA with SAH. Keep SAs ordered by
5276 * create time (newer are first).
5277 */
5278 TAILQ_FOREACH(tmp, &sah->savtree_alive, chain) {
5279 if (newsav->created > tmp->created) {
5280 TAILQ_INSERT_BEFORE(tmp, newsav, chain);
5281 break;
5282 }
5283 }
5284 if (tmp == NULL)
5285 TAILQ_INSERT_TAIL(&sah->savtree_alive, newsav, chain);
5286
5287 /* Add new SA into SPI hash. */
5288 LIST_INSERT_HEAD(SAVHASH_HASH(newsav->spi), newsav, spihash);
5289
5290 /* Add new SAH into SADB. */
5291 if (isnew == 2) {
5292 TAILQ_INSERT_HEAD(&V_sahtree, sah, chain);
5293 LIST_INSERT_HEAD(SAHADDRHASH_HASH(saidx), sah, addrhash);
5294 sah->state = SADB_SASTATE_MATURE;
5295 SAH_ADDREF(sah); /* newsav references new SAH */
5296 }
5297 /*
5298 * isnew == 1 -> @sah was referenced by key_getsah().
5299 * isnew == 0 -> we use the same @sah, that was used by @sav,
5300 * and we use its reference for @newsav.
5301 */
5302 SECASVAR_WLOCK(sav);
5303 /* XXX: replace cntr with pointer? */
5304 newsav->cntr = sav->cntr;
5305 sav->flags |= SADB_X_EXT_F_CLONED;
5306 SECASVAR_WUNLOCK(sav);
5307
5308 SAHTREE_WUNLOCK();
5309
5310 KEYDBG(KEY_STAMP,
5311 printf("%s: SA(%p) cloned into SA(%p)\n",
5312 __func__, sav, newsav));
5313 KEYDBG(KEY_DATA, kdebug_secasv(newsav));
5314
5315 key_freesav(&sav); /* release last reference */
5316
5317 /* set msg buf from mhp */
5318 n = key_getmsgbuf_x1(m, mhp);
5319 if (n == NULL) {
5320 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5321 return (ENOBUFS);
5322 }
5323 m_freem(m);
5324 key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5325 return (0);
5326 fail:
5327 if (isnew != 0)
5328 key_freesah(&sah);
5329 if (newsav != NULL) {
5330 if (newsav->natt != NULL)
5331 free(newsav->natt, M_IPSEC_MISC);
5332 free(newsav, M_IPSEC_SA);
5333 }
5334 return (error);
5335 }
5336
5337 /*
5338 * SADB_UPDATE processing
5339 * receive
5340 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5341 * key(AE), (identity(SD),) (sensitivity)>
5342 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL.
5343 * and send
5344 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5345 * (identity(SD),) (sensitivity)>
5346 * to the ikmpd.
5347 *
5348 * m will always be freed.
5349 */
5350 static int
key_update(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)5351 key_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5352 {
5353 struct secasindex saidx;
5354 struct sadb_address *src0, *dst0;
5355 struct sadb_sa *sa0;
5356 struct secasvar *sav;
5357 uint32_t reqid;
5358 int error;
5359 uint8_t mode, proto;
5360
5361 IPSEC_ASSERT(so != NULL, ("null socket"));
5362 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5363 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5364 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5365
5366 /* map satype to proto */
5367 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5368 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5369 __func__));
5370 return key_senderror(so, m, EINVAL);
5371 }
5372
5373 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
5374 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
5375 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
5376 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
5377 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
5378 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
5379 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
5380 ipseclog((LOG_DEBUG,
5381 "%s: invalid message: missing required header.\n",
5382 __func__));
5383 return key_senderror(so, m, EINVAL);
5384 }
5385 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
5386 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
5387 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
5388 ipseclog((LOG_DEBUG,
5389 "%s: invalid message: wrong header size.\n", __func__));
5390 return key_senderror(so, m, EINVAL);
5391 }
5392 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
5393 mode = IPSEC_MODE_ANY;
5394 reqid = 0;
5395 } else {
5396 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
5397 ipseclog((LOG_DEBUG,
5398 "%s: invalid message: wrong header size.\n",
5399 __func__));
5400 return key_senderror(so, m, EINVAL);
5401 }
5402 mode = ((struct sadb_x_sa2 *)
5403 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
5404 reqid = ((struct sadb_x_sa2 *)
5405 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
5406 }
5407
5408 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5409 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
5410 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
5411
5412 /*
5413 * Only SADB_SASTATE_MATURE SAs may be submitted in an
5414 * SADB_UPDATE message.
5415 */
5416 if (sa0->sadb_sa_state != SADB_SASTATE_MATURE) {
5417 ipseclog((LOG_DEBUG, "%s: invalid state.\n", __func__));
5418 #ifdef PFKEY_STRICT_CHECKS
5419 return key_senderror(so, m, EINVAL);
5420 #endif
5421 }
5422 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
5423 (struct sockaddr *)(dst0 + 1));
5424 if (error != 0) {
5425 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
5426 return key_senderror(so, m, error);
5427 }
5428 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
5429 sav = key_getsavbyspi(sa0->sadb_sa_spi);
5430 if (sav == NULL) {
5431 ipseclog((LOG_DEBUG, "%s: no SA found for SPI %u\n",
5432 __func__, ntohl(sa0->sadb_sa_spi)));
5433 return key_senderror(so, m, EINVAL);
5434 }
5435 /*
5436 * Check that SADB_UPDATE issued by the same process that did
5437 * SADB_GETSPI or SADB_ADD.
5438 */
5439 if (sav->pid != mhp->msg->sadb_msg_pid) {
5440 ipseclog((LOG_DEBUG,
5441 "%s: pid mismatched (SPI %u, pid %u vs. %u)\n", __func__,
5442 ntohl(sav->spi), sav->pid, mhp->msg->sadb_msg_pid));
5443 key_freesav(&sav);
5444 return key_senderror(so, m, EINVAL);
5445 }
5446 /* saidx should match with SA. */
5447 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_MODE_REQID) == 0) {
5448 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u\n",
5449 __func__, ntohl(sav->spi)));
5450 key_freesav(&sav);
5451 return key_senderror(so, m, ESRCH);
5452 }
5453
5454 if (sav->state == SADB_SASTATE_LARVAL) {
5455 if ((mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
5456 SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT)) ||
5457 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
5458 SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH))) {
5459 ipseclog((LOG_DEBUG,
5460 "%s: invalid message: missing required header.\n",
5461 __func__));
5462 key_freesav(&sav);
5463 return key_senderror(so, m, EINVAL);
5464 }
5465 /*
5466 * We can set any values except src, dst and SPI.
5467 */
5468 error = key_setsaval(sav, mhp);
5469 if (error != 0) {
5470 key_freesav(&sav);
5471 return (key_senderror(so, m, error));
5472 }
5473 /* Change SA state to MATURE */
5474 SAHTREE_WLOCK();
5475 if (sav->state != SADB_SASTATE_LARVAL) {
5476 /* SA was deleted or another thread made it MATURE. */
5477 SAHTREE_WUNLOCK();
5478 key_freesav(&sav);
5479 return (key_senderror(so, m, ESRCH));
5480 }
5481 /*
5482 * NOTE: we keep SAs in savtree_alive ordered by created
5483 * time. When SA's state changed from LARVAL to MATURE,
5484 * we update its created time in key_setsaval() and move
5485 * it into head of savtree_alive.
5486 */
5487 TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
5488 TAILQ_INSERT_HEAD(&sav->sah->savtree_alive, sav, chain);
5489 sav->state = SADB_SASTATE_MATURE;
5490 SAHTREE_WUNLOCK();
5491 } else {
5492 /*
5493 * For DYING and MATURE SA we can change only state
5494 * and lifetimes. Report EINVAL if something else attempted
5495 * to change.
5496 */
5497 if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT) ||
5498 !SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH)) {
5499 key_freesav(&sav);
5500 return (key_senderror(so, m, EINVAL));
5501 }
5502 error = key_updatelifetimes(sav, mhp);
5503 if (error != 0) {
5504 key_freesav(&sav);
5505 return (key_senderror(so, m, error));
5506 }
5507 /*
5508 * This is FreeBSD extension to RFC2367.
5509 * IKEd can specify SADB_X_EXT_NEW_ADDRESS_SRC and/or
5510 * SADB_X_EXT_NEW_ADDRESS_DST when it wants to change
5511 * SA addresses (for example to implement MOBIKE protocol
5512 * as described in RFC4555). Also we allow to change
5513 * NAT-T config.
5514 */
5515 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC) ||
5516 !SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST) ||
5517 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5518 sav->natt != NULL) {
5519 error = key_updateaddresses(so, m, mhp, sav, &saidx);
5520 key_freesav(&sav);
5521 if (error != 0)
5522 return (key_senderror(so, m, error));
5523 return (0);
5524 }
5525 /* Check that SA is still alive */
5526 SAHTREE_WLOCK();
5527 if (sav->state == SADB_SASTATE_DEAD) {
5528 /* SA was unlinked */
5529 SAHTREE_WUNLOCK();
5530 key_freesav(&sav);
5531 return (key_senderror(so, m, ESRCH));
5532 }
5533 /*
5534 * NOTE: there is possible state moving from DYING to MATURE,
5535 * but this doesn't change created time, so we won't reorder
5536 * this SA.
5537 */
5538 sav->state = SADB_SASTATE_MATURE;
5539 SAHTREE_WUNLOCK();
5540 }
5541 KEYDBG(KEY_STAMP,
5542 printf("%s: SA(%p)\n", __func__, sav));
5543 KEYDBG(KEY_DATA, kdebug_secasv(sav));
5544 key_freesav(&sav);
5545
5546 {
5547 struct mbuf *n;
5548
5549 /* set msg buf from mhp */
5550 n = key_getmsgbuf_x1(m, mhp);
5551 if (n == NULL) {
5552 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5553 return key_senderror(so, m, ENOBUFS);
5554 }
5555
5556 m_freem(m);
5557 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5558 }
5559 }
5560
5561 /*
5562 * SADB_ADD processing
5563 * add an entry to SA database, when received
5564 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5565 * key(AE), (identity(SD),) (sensitivity)>
5566 * from the ikmpd,
5567 * and send
5568 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5569 * (identity(SD),) (sensitivity)>
5570 * to the ikmpd.
5571 *
5572 * IGNORE identity and sensitivity messages.
5573 *
5574 * m will always be freed.
5575 */
5576 static int
key_add(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)5577 key_add(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5578 {
5579 struct secasindex saidx;
5580 struct sadb_address *src0, *dst0;
5581 struct sadb_sa *sa0;
5582 struct secasvar *sav;
5583 uint32_t reqid, spi;
5584 uint8_t mode, proto;
5585 int error;
5586
5587 IPSEC_ASSERT(so != NULL, ("null socket"));
5588 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5589 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5590 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5591
5592 /* map satype to proto */
5593 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5594 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5595 __func__));
5596 return key_senderror(so, m, EINVAL);
5597 }
5598
5599 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
5600 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
5601 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
5602 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && (
5603 SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT) ||
5604 SADB_CHECKLEN(mhp, SADB_EXT_KEY_ENCRYPT))) ||
5605 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && (
5606 SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH) ||
5607 SADB_CHECKLEN(mhp, SADB_EXT_KEY_AUTH))) ||
5608 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
5609 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
5610 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
5611 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
5612 ipseclog((LOG_DEBUG,
5613 "%s: invalid message: missing required header.\n",
5614 __func__));
5615 return key_senderror(so, m, EINVAL);
5616 }
5617 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
5618 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
5619 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
5620 ipseclog((LOG_DEBUG,
5621 "%s: invalid message: wrong header size.\n", __func__));
5622 return key_senderror(so, m, EINVAL);
5623 }
5624 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
5625 mode = IPSEC_MODE_ANY;
5626 reqid = 0;
5627 } else {
5628 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
5629 ipseclog((LOG_DEBUG,
5630 "%s: invalid message: wrong header size.\n",
5631 __func__));
5632 return key_senderror(so, m, EINVAL);
5633 }
5634 mode = ((struct sadb_x_sa2 *)
5635 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
5636 reqid = ((struct sadb_x_sa2 *)
5637 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
5638 }
5639
5640 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5641 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
5642 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
5643
5644 /*
5645 * Only SADB_SASTATE_MATURE SAs may be submitted in an
5646 * SADB_ADD message.
5647 */
5648 if (sa0->sadb_sa_state != SADB_SASTATE_MATURE) {
5649 ipseclog((LOG_DEBUG, "%s: invalid state.\n", __func__));
5650 #ifdef PFKEY_STRICT_CHECKS
5651 return key_senderror(so, m, EINVAL);
5652 #endif
5653 }
5654 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
5655 (struct sockaddr *)(dst0 + 1));
5656 if (error != 0) {
5657 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
5658 return key_senderror(so, m, error);
5659 }
5660 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
5661 spi = sa0->sadb_sa_spi;
5662 /*
5663 * For TCP-MD5 SAs we don't use SPI. Check the uniqueness using
5664 * secasindex.
5665 * XXXAE: IPComp seems also doesn't use SPI.
5666 */
5667 SPI_ALLOC_LOCK();
5668 if (proto == IPPROTO_TCP) {
5669 sav = key_getsav_tcpmd5(&saidx, &spi);
5670 if (sav == NULL && spi == 0) {
5671 SPI_ALLOC_UNLOCK();
5672 /* Failed to allocate SPI */
5673 ipseclog((LOG_DEBUG, "%s: SA already exists.\n",
5674 __func__));
5675 return key_senderror(so, m, EEXIST);
5676 }
5677 /* XXX: SPI that we report back can have another value */
5678 } else {
5679 /* We can create new SA only if SPI is different. */
5680 sav = key_getsavbyspi(spi);
5681 }
5682 if (sav != NULL) {
5683 SPI_ALLOC_UNLOCK();
5684 key_freesav(&sav);
5685 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__));
5686 return key_senderror(so, m, EEXIST);
5687 }
5688
5689 sav = key_newsav(mhp, &saidx, spi, &error);
5690 SPI_ALLOC_UNLOCK();
5691 if (sav == NULL)
5692 return key_senderror(so, m, error);
5693 KEYDBG(KEY_STAMP,
5694 printf("%s: return SA(%p)\n", __func__, sav));
5695 KEYDBG(KEY_DATA, kdebug_secasv(sav));
5696 /*
5697 * If SADB_ADD was in response to SADB_ACQUIRE, we need to schedule
5698 * ACQ for deletion.
5699 */
5700 if (sav->seq != 0)
5701 key_acqdone(&saidx, sav->seq);
5702
5703 {
5704 /*
5705 * Don't call key_freesav() on error here, as we would like to
5706 * keep the SA in the database.
5707 */
5708 struct mbuf *n;
5709
5710 /* set msg buf from mhp */
5711 n = key_getmsgbuf_x1(m, mhp);
5712 if (n == NULL) {
5713 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5714 return key_senderror(so, m, ENOBUFS);
5715 }
5716
5717 m_freem(m);
5718 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5719 }
5720 }
5721
5722 /*
5723 * NAT-T support.
5724 * IKEd may request the use ESP in UDP encapsulation when it detects the
5725 * presence of NAT. It uses NAT-T extension headers for such SAs to specify
5726 * parameters needed for encapsulation and decapsulation. These PF_KEY
5727 * extension headers are not standardized, so this comment addresses our
5728 * implementation.
5729 * SADB_X_EXT_NAT_T_TYPE specifies type of encapsulation, we support only
5730 * UDP_ENCAP_ESPINUDP as described in RFC3948.
5731 * SADB_X_EXT_NAT_T_SPORT/DPORT specifies source and destination ports for
5732 * UDP header. We use these ports in UDP encapsulation procedure, also we
5733 * can check them in UDP decapsulation procedure.
5734 * SADB_X_EXT_NAT_T_OA[IR] specifies original address of initiator or
5735 * responder. These addresses can be used for transport mode to adjust
5736 * checksum after decapsulation and decryption. Since original IP addresses
5737 * used by peer usually different (we detected presence of NAT), TCP/UDP
5738 * pseudo header checksum and IP header checksum was calculated using original
5739 * addresses. After decapsulation and decryption we need to adjust checksum
5740 * to have correct datagram.
5741 *
5742 * We expect presence of NAT-T extension headers only in SADB_ADD and
5743 * SADB_UPDATE messages. We report NAT-T extension headers in replies
5744 * to SADB_ADD, SADB_UPDATE, SADB_GET, and SADB_DUMP messages.
5745 */
5746 static int
key_setnatt(struct secasvar * sav,const struct sadb_msghdr * mhp)5747 key_setnatt(struct secasvar *sav, const struct sadb_msghdr *mhp)
5748 {
5749 struct sadb_x_nat_t_port *port;
5750 struct sadb_x_nat_t_type *type;
5751 struct sadb_address *oai, *oar;
5752 struct sockaddr *sa;
5753 uint32_t addr;
5754 uint16_t cksum;
5755 int i;
5756
5757 IPSEC_ASSERT(sav->natt == NULL, ("natt is already initialized"));
5758 /*
5759 * Ignore NAT-T headers if sproto isn't ESP.
5760 */
5761 if (sav->sah->saidx.proto != IPPROTO_ESP)
5762 return (0);
5763
5764 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) &&
5765 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_SPORT) &&
5766 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5767 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5768 SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_SPORT) ||
5769 SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5770 ipseclog((LOG_DEBUG,
5771 "%s: invalid message: wrong header size.\n",
5772 __func__));
5773 return (EINVAL);
5774 }
5775 } else
5776 return (0);
5777
5778 type = (struct sadb_x_nat_t_type *)mhp->ext[SADB_X_EXT_NAT_T_TYPE];
5779 if (type->sadb_x_nat_t_type_type != UDP_ENCAP_ESPINUDP) {
5780 ipseclog((LOG_DEBUG, "%s: unsupported NAT-T type %u.\n",
5781 __func__, type->sadb_x_nat_t_type_type));
5782 return (EINVAL);
5783 }
5784 /*
5785 * Allocate storage for NAT-T config.
5786 * On error it will be released by key_cleansav().
5787 */
5788 sav->natt = malloc(sizeof(struct secnatt), M_IPSEC_MISC,
5789 M_NOWAIT | M_ZERO);
5790 if (sav->natt == NULL) {
5791 PFKEYSTAT_INC(in_nomem);
5792 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5793 return (ENOBUFS);
5794 }
5795 port = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_SPORT];
5796 if (port->sadb_x_nat_t_port_port == 0) {
5797 ipseclog((LOG_DEBUG, "%s: invalid NAT-T sport specified.\n",
5798 __func__));
5799 return (EINVAL);
5800 }
5801 sav->natt->sport = port->sadb_x_nat_t_port_port;
5802 port = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_DPORT];
5803 if (port->sadb_x_nat_t_port_port == 0) {
5804 ipseclog((LOG_DEBUG, "%s: invalid NAT-T dport specified.\n",
5805 __func__));
5806 return (EINVAL);
5807 }
5808 sav->natt->dport = port->sadb_x_nat_t_port_port;
5809
5810 /*
5811 * SADB_X_EXT_NAT_T_OAI and SADB_X_EXT_NAT_T_OAR are optional
5812 * and needed only for transport mode IPsec.
5813 * Usually NAT translates only one address, but it is possible,
5814 * that both addresses could be translated.
5815 * NOTE: Value of SADB_X_EXT_NAT_T_OAI is equal to SADB_X_EXT_NAT_T_OA.
5816 */
5817 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_OAI)) {
5818 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_OAI)) {
5819 ipseclog((LOG_DEBUG,
5820 "%s: invalid message: wrong header size.\n",
5821 __func__));
5822 return (EINVAL);
5823 }
5824 oai = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI];
5825 } else
5826 oai = NULL;
5827 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_OAR)) {
5828 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_OAR)) {
5829 ipseclog((LOG_DEBUG,
5830 "%s: invalid message: wrong header size.\n",
5831 __func__));
5832 return (EINVAL);
5833 }
5834 oar = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR];
5835 } else
5836 oar = NULL;
5837
5838 /* Initialize addresses only for transport mode */
5839 if (sav->sah->saidx.mode != IPSEC_MODE_TUNNEL) {
5840 cksum = 0;
5841 if (oai != NULL) {
5842 sa = (struct sockaddr *)(oai + 1);
5843 switch (sa->sa_family) {
5844 #ifdef AF_INET
5845 case AF_INET:
5846 if (sa->sa_len != sizeof(struct sockaddr_in)) {
5847 ipseclog((LOG_DEBUG,
5848 "%s: wrong NAT-OAi header.\n",
5849 __func__));
5850 return (EINVAL);
5851 }
5852 /* Ignore address if it the same */
5853 if (((struct sockaddr_in *)sa)->sin_addr.s_addr !=
5854 sav->sah->saidx.src.sin.sin_addr.s_addr) {
5855 bcopy(sa, &sav->natt->oai.sa, sa->sa_len);
5856 sav->natt->flags |= IPSEC_NATT_F_OAI;
5857 /* Calculate checksum delta */
5858 addr = sav->sah->saidx.src.sin.sin_addr.s_addr;
5859 cksum = in_addword(cksum, ~addr >> 16);
5860 cksum = in_addword(cksum, ~addr & 0xffff);
5861 addr = sav->natt->oai.sin.sin_addr.s_addr;
5862 cksum = in_addword(cksum, addr >> 16);
5863 cksum = in_addword(cksum, addr & 0xffff);
5864 }
5865 break;
5866 #endif
5867 #ifdef AF_INET6
5868 case AF_INET6:
5869 if (sa->sa_len != sizeof(struct sockaddr_in6)) {
5870 ipseclog((LOG_DEBUG,
5871 "%s: wrong NAT-OAi header.\n",
5872 __func__));
5873 return (EINVAL);
5874 }
5875 /* Ignore address if it the same */
5876 if (memcmp(&((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr,
5877 &sav->sah->saidx.src.sin6.sin6_addr.s6_addr,
5878 sizeof(struct in6_addr)) != 0) {
5879 bcopy(sa, &sav->natt->oai.sa, sa->sa_len);
5880 sav->natt->flags |= IPSEC_NATT_F_OAI;
5881 /* Calculate checksum delta */
5882 for (i = 0; i < 8; i++) {
5883 cksum = in_addword(cksum,
5884 ~sav->sah->saidx.src.sin6.sin6_addr.s6_addr16[i]);
5885 cksum = in_addword(cksum,
5886 sav->natt->oai.sin6.sin6_addr.s6_addr16[i]);
5887 }
5888 }
5889 break;
5890 #endif
5891 default:
5892 ipseclog((LOG_DEBUG,
5893 "%s: wrong NAT-OAi header.\n",
5894 __func__));
5895 return (EINVAL);
5896 }
5897 }
5898 if (oar != NULL) {
5899 sa = (struct sockaddr *)(oar + 1);
5900 switch (sa->sa_family) {
5901 #ifdef AF_INET
5902 case AF_INET:
5903 if (sa->sa_len != sizeof(struct sockaddr_in)) {
5904 ipseclog((LOG_DEBUG,
5905 "%s: wrong NAT-OAr header.\n",
5906 __func__));
5907 return (EINVAL);
5908 }
5909 /* Ignore address if it the same */
5910 if (((struct sockaddr_in *)sa)->sin_addr.s_addr !=
5911 sav->sah->saidx.dst.sin.sin_addr.s_addr) {
5912 bcopy(sa, &sav->natt->oar.sa, sa->sa_len);
5913 sav->natt->flags |= IPSEC_NATT_F_OAR;
5914 /* Calculate checksum delta */
5915 addr = sav->sah->saidx.dst.sin.sin_addr.s_addr;
5916 cksum = in_addword(cksum, ~addr >> 16);
5917 cksum = in_addword(cksum, ~addr & 0xffff);
5918 addr = sav->natt->oar.sin.sin_addr.s_addr;
5919 cksum = in_addword(cksum, addr >> 16);
5920 cksum = in_addword(cksum, addr & 0xffff);
5921 }
5922 break;
5923 #endif
5924 #ifdef AF_INET6
5925 case AF_INET6:
5926 if (sa->sa_len != sizeof(struct sockaddr_in6)) {
5927 ipseclog((LOG_DEBUG,
5928 "%s: wrong NAT-OAr header.\n",
5929 __func__));
5930 return (EINVAL);
5931 }
5932 /* Ignore address if it the same */
5933 if (memcmp(&((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr,
5934 &sav->sah->saidx.dst.sin6.sin6_addr.s6_addr, 16) != 0) {
5935 bcopy(sa, &sav->natt->oar.sa, sa->sa_len);
5936 sav->natt->flags |= IPSEC_NATT_F_OAR;
5937 /* Calculate checksum delta */
5938 for (i = 0; i < 8; i++) {
5939 cksum = in_addword(cksum,
5940 ~sav->sah->saidx.dst.sin6.sin6_addr.s6_addr16[i]);
5941 cksum = in_addword(cksum,
5942 sav->natt->oar.sin6.sin6_addr.s6_addr16[i]);
5943 }
5944 }
5945 break;
5946 #endif
5947 default:
5948 ipseclog((LOG_DEBUG,
5949 "%s: wrong NAT-OAr header.\n",
5950 __func__));
5951 return (EINVAL);
5952 }
5953 }
5954 sav->natt->cksum = cksum;
5955 }
5956 return (0);
5957 }
5958
5959 static int
key_setident(struct secashead * sah,const struct sadb_msghdr * mhp)5960 key_setident(struct secashead *sah, const struct sadb_msghdr *mhp)
5961 {
5962 const struct sadb_ident *idsrc, *iddst;
5963
5964 IPSEC_ASSERT(sah != NULL, ("null secashead"));
5965 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5966 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5967
5968 /* don't make buffer if not there */
5969 if (SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_SRC) &&
5970 SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_DST)) {
5971 sah->idents = NULL;
5972 sah->identd = NULL;
5973 return (0);
5974 }
5975
5976 if (SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_SRC) ||
5977 SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_DST)) {
5978 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__));
5979 return (EINVAL);
5980 }
5981
5982 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC];
5983 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST];
5984
5985 /* validity check */
5986 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) {
5987 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__));
5988 return EINVAL;
5989 }
5990
5991 switch (idsrc->sadb_ident_type) {
5992 case SADB_IDENTTYPE_PREFIX:
5993 case SADB_IDENTTYPE_FQDN:
5994 case SADB_IDENTTYPE_USERFQDN:
5995 default:
5996 /* XXX do nothing */
5997 sah->idents = NULL;
5998 sah->identd = NULL;
5999 return 0;
6000 }
6001
6002 /* make structure */
6003 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
6004 if (sah->idents == NULL) {
6005 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
6006 return ENOBUFS;
6007 }
6008 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
6009 if (sah->identd == NULL) {
6010 free(sah->idents, M_IPSEC_MISC);
6011 sah->idents = NULL;
6012 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
6013 return ENOBUFS;
6014 }
6015 sah->idents->type = idsrc->sadb_ident_type;
6016 sah->idents->id = idsrc->sadb_ident_id;
6017
6018 sah->identd->type = iddst->sadb_ident_type;
6019 sah->identd->id = iddst->sadb_ident_id;
6020
6021 return 0;
6022 }
6023
6024 /*
6025 * m will not be freed on return.
6026 * it is caller's responsibility to free the result.
6027 *
6028 * Called from SADB_ADD and SADB_UPDATE. Reply will contain headers
6029 * from the request in defined order.
6030 */
6031 static struct mbuf *
key_getmsgbuf_x1(struct mbuf * m,const struct sadb_msghdr * mhp)6032 key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp)
6033 {
6034 struct mbuf *n;
6035
6036 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6037 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6038 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6039
6040 /* create new sadb_msg to reply. */
6041 n = key_gather_mbuf(m, mhp, 1, 16, SADB_EXT_RESERVED,
6042 SADB_EXT_SA, SADB_X_EXT_SA2,
6043 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST,
6044 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
6045 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST,
6046 SADB_X_EXT_NAT_T_TYPE, SADB_X_EXT_NAT_T_SPORT,
6047 SADB_X_EXT_NAT_T_DPORT, SADB_X_EXT_NAT_T_OAI,
6048 SADB_X_EXT_NAT_T_OAR, SADB_X_EXT_NEW_ADDRESS_SRC,
6049 SADB_X_EXT_NEW_ADDRESS_DST);
6050 if (!n)
6051 return NULL;
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 NULL;
6057 }
6058 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0;
6059 mtod(n, struct sadb_msg *)->sadb_msg_len =
6060 PFKEY_UNIT64(n->m_pkthdr.len);
6061
6062 return n;
6063 }
6064
6065 /*
6066 * SADB_DELETE processing
6067 * receive
6068 * <base, SA(*), address(SD)>
6069 * from the ikmpd, and set SADB_SASTATE_DEAD,
6070 * and send,
6071 * <base, SA(*), address(SD)>
6072 * to the ikmpd.
6073 *
6074 * m will always be freed.
6075 */
6076 static int
key_delete(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)6077 key_delete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6078 {
6079 struct secasindex saidx;
6080 struct sadb_address *src0, *dst0;
6081 struct secasvar *sav;
6082 struct sadb_sa *sa0;
6083 uint8_t proto;
6084
6085 IPSEC_ASSERT(so != NULL, ("null socket"));
6086 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6087 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6088 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6089
6090 /* map satype to proto */
6091 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6092 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
6093 __func__));
6094 return key_senderror(so, m, EINVAL);
6095 }
6096
6097 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
6098 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
6099 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
6100 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
6101 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
6102 __func__));
6103 return key_senderror(so, m, EINVAL);
6104 }
6105
6106 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
6107 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
6108
6109 if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
6110 (struct sockaddr *)(dst0 + 1)) != 0) {
6111 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
6112 return (key_senderror(so, m, EINVAL));
6113 }
6114 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
6115 if (SADB_CHECKHDR(mhp, SADB_EXT_SA)) {
6116 /*
6117 * Caller wants us to delete all non-LARVAL SAs
6118 * that match the src/dst. This is used during
6119 * IKE INITIAL-CONTACT.
6120 * XXXAE: this looks like some extension to RFC2367.
6121 */
6122 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__));
6123 return (key_delete_all(so, m, mhp, &saidx));
6124 }
6125 if (SADB_CHECKLEN(mhp, SADB_EXT_SA)) {
6126 ipseclog((LOG_DEBUG,
6127 "%s: invalid message: wrong header size.\n", __func__));
6128 return (key_senderror(so, m, EINVAL));
6129 }
6130 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
6131 SPI_ALLOC_LOCK();
6132 if (proto == IPPROTO_TCP)
6133 sav = key_getsav_tcpmd5(&saidx, NULL);
6134 else
6135 sav = key_getsavbyspi(sa0->sadb_sa_spi);
6136 SPI_ALLOC_UNLOCK();
6137 if (sav == NULL) {
6138 ipseclog((LOG_DEBUG, "%s: no SA found for SPI %u.\n",
6139 __func__, ntohl(sa0->sadb_sa_spi)));
6140 return (key_senderror(so, m, ESRCH));
6141 }
6142 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_HEAD) == 0) {
6143 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u.\n",
6144 __func__, ntohl(sav->spi)));
6145 key_freesav(&sav);
6146 return (key_senderror(so, m, ESRCH));
6147 }
6148 KEYDBG(KEY_STAMP,
6149 printf("%s: SA(%p)\n", __func__, sav));
6150 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6151 key_unlinksav(sav);
6152 key_freesav(&sav);
6153
6154 {
6155 struct mbuf *n;
6156 struct sadb_msg *newmsg;
6157
6158 /* create new sadb_msg to reply. */
6159 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
6160 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
6161 if (!n)
6162 return key_senderror(so, m, ENOBUFS);
6163
6164 if (n->m_len < sizeof(struct sadb_msg)) {
6165 n = m_pullup(n, sizeof(struct sadb_msg));
6166 if (n == NULL)
6167 return key_senderror(so, m, ENOBUFS);
6168 }
6169 newmsg = mtod(n, struct sadb_msg *);
6170 newmsg->sadb_msg_errno = 0;
6171 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
6172
6173 m_freem(m);
6174 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
6175 }
6176 }
6177
6178 /*
6179 * delete all SAs for src/dst. Called from key_delete().
6180 */
6181 static int
key_delete_all(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp,struct secasindex * saidx)6182 key_delete_all(struct socket *so, struct mbuf *m,
6183 const struct sadb_msghdr *mhp, struct secasindex *saidx)
6184 {
6185 struct secasvar_queue drainq;
6186 struct secashead *sah;
6187 struct secasvar *sav, *nextsav;
6188
6189 TAILQ_INIT(&drainq);
6190 SAHTREE_WLOCK();
6191 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
6192 if (key_cmpsaidx(&sah->saidx, saidx, CMP_HEAD) == 0)
6193 continue;
6194 /* Move all ALIVE SAs into drainq */
6195 TAILQ_CONCAT(&drainq, &sah->savtree_alive, chain);
6196 }
6197 /* Unlink all queued SAs from SPI hash */
6198 TAILQ_FOREACH(sav, &drainq, chain) {
6199 sav->state = SADB_SASTATE_DEAD;
6200 LIST_REMOVE(sav, spihash);
6201 }
6202 SAHTREE_WUNLOCK();
6203 /* Now we can release reference for all SAs in drainq */
6204 sav = TAILQ_FIRST(&drainq);
6205 while (sav != NULL) {
6206 KEYDBG(KEY_STAMP,
6207 printf("%s: SA(%p)\n", __func__, sav));
6208 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6209 nextsav = TAILQ_NEXT(sav, chain);
6210 key_freesah(&sav->sah); /* release reference from SAV */
6211 key_freesav(&sav); /* release last reference */
6212 sav = nextsav;
6213 }
6214
6215 {
6216 struct mbuf *n;
6217 struct sadb_msg *newmsg;
6218
6219 /* create new sadb_msg to reply. */
6220 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED,
6221 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
6222 if (!n)
6223 return key_senderror(so, m, ENOBUFS);
6224
6225 if (n->m_len < sizeof(struct sadb_msg)) {
6226 n = m_pullup(n, sizeof(struct sadb_msg));
6227 if (n == NULL)
6228 return key_senderror(so, m, ENOBUFS);
6229 }
6230 newmsg = mtod(n, struct sadb_msg *);
6231 newmsg->sadb_msg_errno = 0;
6232 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
6233
6234 m_freem(m);
6235 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
6236 }
6237 }
6238
6239 /*
6240 * Delete all alive SAs for corresponding xform.
6241 * Larval SAs have not initialized tdb_xform, so it is safe to leave them
6242 * here when xform disappears.
6243 */
6244 void
key_delete_xform(const struct xformsw * xsp)6245 key_delete_xform(const struct xformsw *xsp)
6246 {
6247 struct secasvar_queue drainq;
6248 struct secashead *sah;
6249 struct secasvar *sav, *nextsav;
6250
6251 TAILQ_INIT(&drainq);
6252 SAHTREE_WLOCK();
6253 TAILQ_FOREACH(sah, &V_sahtree, chain) {
6254 sav = TAILQ_FIRST(&sah->savtree_alive);
6255 if (sav == NULL)
6256 continue;
6257 if (sav->tdb_xform != xsp)
6258 continue;
6259 /*
6260 * It is supposed that all SAs in the chain are related to
6261 * one xform.
6262 */
6263 TAILQ_CONCAT(&drainq, &sah->savtree_alive, chain);
6264 }
6265 /* Unlink all queued SAs from SPI hash */
6266 TAILQ_FOREACH(sav, &drainq, chain) {
6267 sav->state = SADB_SASTATE_DEAD;
6268 LIST_REMOVE(sav, spihash);
6269 }
6270 SAHTREE_WUNLOCK();
6271
6272 /* Now we can release reference for all SAs in drainq */
6273 sav = TAILQ_FIRST(&drainq);
6274 while (sav != NULL) {
6275 KEYDBG(KEY_STAMP,
6276 printf("%s: SA(%p)\n", __func__, sav));
6277 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6278 nextsav = TAILQ_NEXT(sav, chain);
6279 key_freesah(&sav->sah); /* release reference from SAV */
6280 key_freesav(&sav); /* release last reference */
6281 sav = nextsav;
6282 }
6283 }
6284
6285 /*
6286 * SADB_GET processing
6287 * receive
6288 * <base, SA(*), address(SD)>
6289 * from the ikmpd, and get a SP and a SA to respond,
6290 * and send,
6291 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE),
6292 * (identity(SD),) (sensitivity)>
6293 * to the ikmpd.
6294 *
6295 * m will always be freed.
6296 */
6297 static int
key_get(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)6298 key_get(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6299 {
6300 struct secasindex saidx;
6301 struct sadb_address *src0, *dst0;
6302 struct sadb_sa *sa0;
6303 struct secasvar *sav;
6304 uint8_t proto;
6305
6306 IPSEC_ASSERT(so != NULL, ("null socket"));
6307 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6308 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6309 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6310
6311 /* map satype to proto */
6312 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6313 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
6314 __func__));
6315 return key_senderror(so, m, EINVAL);
6316 }
6317
6318 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
6319 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
6320 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST)) {
6321 ipseclog((LOG_DEBUG,
6322 "%s: invalid message: missing required header.\n",
6323 __func__));
6324 return key_senderror(so, m, EINVAL);
6325 }
6326 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
6327 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
6328 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
6329 ipseclog((LOG_DEBUG,
6330 "%s: invalid message: wrong header size.\n", __func__));
6331 return key_senderror(so, m, EINVAL);
6332 }
6333
6334 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
6335 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
6336 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
6337
6338 if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
6339 (struct sockaddr *)(dst0 + 1)) != 0) {
6340 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
6341 return key_senderror(so, m, EINVAL);
6342 }
6343 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
6344
6345 SPI_ALLOC_LOCK();
6346 if (proto == IPPROTO_TCP)
6347 sav = key_getsav_tcpmd5(&saidx, NULL);
6348 else
6349 sav = key_getsavbyspi(sa0->sadb_sa_spi);
6350 SPI_ALLOC_UNLOCK();
6351 if (sav == NULL) {
6352 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__));
6353 return key_senderror(so, m, ESRCH);
6354 }
6355 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_HEAD) == 0) {
6356 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u.\n",
6357 __func__, ntohl(sa0->sadb_sa_spi)));
6358 key_freesav(&sav);
6359 return (key_senderror(so, m, ESRCH));
6360 }
6361
6362 {
6363 struct mbuf *n;
6364 uint8_t satype;
6365
6366 /* map proto to satype */
6367 if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0) {
6368 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n",
6369 __func__));
6370 key_freesav(&sav);
6371 return key_senderror(so, m, EINVAL);
6372 }
6373
6374 /* create new sadb_msg to reply. */
6375 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq,
6376 mhp->msg->sadb_msg_pid);
6377
6378 key_freesav(&sav);
6379 if (!n)
6380 return key_senderror(so, m, ENOBUFS);
6381
6382 m_freem(m);
6383 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
6384 }
6385 }
6386
6387 /* XXX make it sysctl-configurable? */
6388 static void
key_getcomb_setlifetime(struct sadb_comb * comb)6389 key_getcomb_setlifetime(struct sadb_comb *comb)
6390 {
6391
6392 comb->sadb_comb_soft_allocations = 1;
6393 comb->sadb_comb_hard_allocations = 1;
6394 comb->sadb_comb_soft_bytes = 0;
6395 comb->sadb_comb_hard_bytes = 0;
6396 comb->sadb_comb_hard_addtime = 86400; /* 1 day */
6397 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100;
6398 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */
6399 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100;
6400 }
6401
6402 /*
6403 * XXX reorder combinations by preference
6404 * XXX no idea if the user wants ESP authentication or not
6405 */
6406 static struct mbuf *
key_getcomb_ealg(void)6407 key_getcomb_ealg(void)
6408 {
6409 struct sadb_comb *comb;
6410 const struct enc_xform *algo;
6411 struct mbuf *result = NULL, *m, *n;
6412 int encmin;
6413 int i, off, o;
6414 int totlen;
6415 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6416
6417 m = NULL;
6418 for (i = 1; i <= SADB_EALG_MAX; i++) {
6419 algo = enc_algorithm_lookup(i);
6420 if (algo == NULL)
6421 continue;
6422
6423 /* discard algorithms with key size smaller than system min */
6424 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin)
6425 continue;
6426 if (_BITS(algo->minkey) < V_ipsec_esp_keymin)
6427 encmin = V_ipsec_esp_keymin;
6428 else
6429 encmin = _BITS(algo->minkey);
6430
6431 if (V_ipsec_esp_auth)
6432 m = key_getcomb_ah();
6433 else {
6434 IPSEC_ASSERT(l <= MLEN,
6435 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6436 MGET(m, M_NOWAIT, MT_DATA);
6437 if (m) {
6438 M_ALIGN(m, l);
6439 m->m_len = l;
6440 m->m_next = NULL;
6441 bzero(mtod(m, caddr_t), m->m_len);
6442 }
6443 }
6444 if (!m)
6445 goto fail;
6446
6447 totlen = 0;
6448 for (n = m; n; n = n->m_next)
6449 totlen += n->m_len;
6450 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l));
6451
6452 for (off = 0; off < totlen; off += l) {
6453 n = m_pulldown(m, off, l, &o);
6454 if (!n) {
6455 /* m is already freed */
6456 goto fail;
6457 }
6458 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o);
6459 bzero(comb, sizeof(*comb));
6460 key_getcomb_setlifetime(comb);
6461 comb->sadb_comb_encrypt = i;
6462 comb->sadb_comb_encrypt_minbits = encmin;
6463 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey);
6464 }
6465
6466 if (!result)
6467 result = m;
6468 else
6469 m_cat(result, m);
6470 }
6471
6472 return result;
6473
6474 fail:
6475 if (result)
6476 m_freem(result);
6477 return NULL;
6478 }
6479
6480 static void
key_getsizes_ah(const struct auth_hash * ah,int alg,u_int16_t * min,u_int16_t * max)6481 key_getsizes_ah(const struct auth_hash *ah, int alg, u_int16_t* min,
6482 u_int16_t* max)
6483 {
6484
6485 *min = *max = ah->hashsize;
6486 if (ah->keysize == 0) {
6487 /*
6488 * Transform takes arbitrary key size but algorithm
6489 * key size is restricted. Enforce this here.
6490 */
6491 switch (alg) {
6492 case SADB_X_AALG_NULL: *min = 1; *max = 256; break;
6493 case SADB_X_AALG_SHA2_256: *min = *max = 32; break;
6494 case SADB_X_AALG_SHA2_384: *min = *max = 48; break;
6495 case SADB_X_AALG_SHA2_512: *min = *max = 64; break;
6496 default:
6497 DPRINTF(("%s: unknown AH algorithm %u\n",
6498 __func__, alg));
6499 break;
6500 }
6501 }
6502 }
6503
6504 /*
6505 * XXX reorder combinations by preference
6506 */
6507 static struct mbuf *
key_getcomb_ah(void)6508 key_getcomb_ah(void)
6509 {
6510 const struct auth_hash *algo;
6511 struct sadb_comb *comb;
6512 struct mbuf *m;
6513 u_int16_t minkeysize, maxkeysize;
6514 int i;
6515 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6516
6517 m = NULL;
6518 for (i = 1; i <= SADB_AALG_MAX; i++) {
6519 #if 1
6520 /* we prefer HMAC algorithms, not old algorithms */
6521 if (i != SADB_AALG_SHA1HMAC &&
6522 i != SADB_X_AALG_SHA2_256 &&
6523 i != SADB_X_AALG_SHA2_384 &&
6524 i != SADB_X_AALG_SHA2_512)
6525 continue;
6526 #endif
6527 algo = auth_algorithm_lookup(i);
6528 if (!algo)
6529 continue;
6530 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize);
6531 /* discard algorithms with key size smaller than system min */
6532 if (_BITS(minkeysize) < V_ipsec_ah_keymin)
6533 continue;
6534
6535 if (!m) {
6536 IPSEC_ASSERT(l <= MLEN,
6537 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6538 MGET(m, M_NOWAIT, MT_DATA);
6539 if (m) {
6540 M_ALIGN(m, l);
6541 m->m_len = l;
6542 m->m_next = NULL;
6543 }
6544 } else
6545 M_PREPEND(m, l, M_NOWAIT);
6546 if (!m)
6547 return NULL;
6548
6549 comb = mtod(m, struct sadb_comb *);
6550 bzero(comb, sizeof(*comb));
6551 key_getcomb_setlifetime(comb);
6552 comb->sadb_comb_auth = i;
6553 comb->sadb_comb_auth_minbits = _BITS(minkeysize);
6554 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize);
6555 }
6556
6557 return m;
6558 }
6559
6560 /*
6561 * not really an official behavior. discussed in pf_key@inner.net in Sep2000.
6562 * XXX reorder combinations by preference
6563 */
6564 static struct mbuf *
key_getcomb_ipcomp(void)6565 key_getcomb_ipcomp(void)
6566 {
6567 const struct comp_algo *algo;
6568 struct sadb_comb *comb;
6569 struct mbuf *m;
6570 int i;
6571 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6572
6573 m = NULL;
6574 for (i = 1; i <= SADB_X_CALG_MAX; i++) {
6575 algo = comp_algorithm_lookup(i);
6576 if (!algo)
6577 continue;
6578
6579 if (!m) {
6580 IPSEC_ASSERT(l <= MLEN,
6581 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6582 MGET(m, M_NOWAIT, MT_DATA);
6583 if (m) {
6584 M_ALIGN(m, l);
6585 m->m_len = l;
6586 m->m_next = NULL;
6587 }
6588 } else
6589 M_PREPEND(m, l, M_NOWAIT);
6590 if (!m)
6591 return NULL;
6592
6593 comb = mtod(m, struct sadb_comb *);
6594 bzero(comb, sizeof(*comb));
6595 key_getcomb_setlifetime(comb);
6596 comb->sadb_comb_encrypt = i;
6597 /* what should we set into sadb_comb_*_{min,max}bits? */
6598 }
6599
6600 return m;
6601 }
6602
6603 /*
6604 * XXX no way to pass mode (transport/tunnel) to userland
6605 * XXX replay checking?
6606 * XXX sysctl interface to ipsec_{ah,esp}_keymin
6607 */
6608 static struct mbuf *
key_getprop(const struct secasindex * saidx)6609 key_getprop(const struct secasindex *saidx)
6610 {
6611 struct sadb_prop *prop;
6612 struct mbuf *m, *n;
6613 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop));
6614 int totlen;
6615
6616 switch (saidx->proto) {
6617 case IPPROTO_ESP:
6618 m = key_getcomb_ealg();
6619 break;
6620 case IPPROTO_AH:
6621 m = key_getcomb_ah();
6622 break;
6623 case IPPROTO_IPCOMP:
6624 m = key_getcomb_ipcomp();
6625 break;
6626 default:
6627 return NULL;
6628 }
6629
6630 if (!m)
6631 return NULL;
6632 M_PREPEND(m, l, M_NOWAIT);
6633 if (!m)
6634 return NULL;
6635
6636 totlen = 0;
6637 for (n = m; n; n = n->m_next)
6638 totlen += n->m_len;
6639
6640 prop = mtod(m, struct sadb_prop *);
6641 bzero(prop, sizeof(*prop));
6642 prop->sadb_prop_len = PFKEY_UNIT64(totlen);
6643 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL;
6644 prop->sadb_prop_replay = 32; /* XXX */
6645
6646 return m;
6647 }
6648
6649 /*
6650 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2().
6651 * send
6652 * <base, SA, address(SD), (address(P)), x_policy,
6653 * (identity(SD),) (sensitivity,) proposal>
6654 * to KMD, and expect to receive
6655 * <base> with SADB_ACQUIRE if error occurred,
6656 * or
6657 * <base, src address, dst address, (SPI range)> with SADB_GETSPI
6658 * from KMD by PF_KEY.
6659 *
6660 * XXX x_policy is outside of RFC2367 (KAME extension).
6661 * XXX sensitivity is not supported.
6662 * XXX for ipcomp, RFC2367 does not define how to fill in proposal.
6663 * see comment for key_getcomb_ipcomp().
6664 *
6665 * OUT:
6666 * 0 : succeed
6667 * others: error number
6668 */
6669 static int
key_acquire(const struct secasindex * saidx,struct secpolicy * sp)6670 key_acquire(const struct secasindex *saidx, struct secpolicy *sp)
6671 {
6672 union sockaddr_union addr;
6673 struct mbuf *result, *m;
6674 uint32_t seq;
6675 int error;
6676 uint16_t ul_proto;
6677 uint8_t mask, satype;
6678
6679 IPSEC_ASSERT(saidx != NULL, ("null saidx"));
6680 satype = key_proto2satype(saidx->proto);
6681 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto));
6682
6683 error = -1;
6684 result = NULL;
6685 ul_proto = IPSEC_ULPROTO_ANY;
6686
6687 /* Get seq number to check whether sending message or not. */
6688 seq = key_getacq(saidx, &error);
6689 if (seq == 0)
6690 return (error);
6691
6692 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0);
6693 if (!m) {
6694 error = ENOBUFS;
6695 goto fail;
6696 }
6697 result = m;
6698
6699 /*
6700 * set sadb_address for saidx's.
6701 *
6702 * Note that if sp is supplied, then we're being called from
6703 * key_allocsa_policy() and should supply port and protocol
6704 * information.
6705 * XXXAE: why only TCP and UDP? ICMP and SCTP looks applicable too.
6706 * XXXAE: probably we can handle this in the ipsec[46]_allocsa().
6707 * XXXAE: it looks like we should save this info in the ACQ entry.
6708 */
6709 if (sp != NULL && (sp->spidx.ul_proto == IPPROTO_TCP ||
6710 sp->spidx.ul_proto == IPPROTO_UDP))
6711 ul_proto = sp->spidx.ul_proto;
6712
6713 addr = saidx->src;
6714 mask = FULLMASK;
6715 if (ul_proto != IPSEC_ULPROTO_ANY) {
6716 switch (sp->spidx.src.sa.sa_family) {
6717 case AF_INET:
6718 if (sp->spidx.src.sin.sin_port != IPSEC_PORT_ANY) {
6719 addr.sin.sin_port = sp->spidx.src.sin.sin_port;
6720 mask = sp->spidx.prefs;
6721 }
6722 break;
6723 case AF_INET6:
6724 if (sp->spidx.src.sin6.sin6_port != IPSEC_PORT_ANY) {
6725 addr.sin6.sin6_port =
6726 sp->spidx.src.sin6.sin6_port;
6727 mask = sp->spidx.prefs;
6728 }
6729 break;
6730 default:
6731 break;
6732 }
6733 }
6734 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &addr.sa, mask, ul_proto);
6735 if (!m) {
6736 error = ENOBUFS;
6737 goto fail;
6738 }
6739 m_cat(result, m);
6740
6741 addr = saidx->dst;
6742 mask = FULLMASK;
6743 if (ul_proto != IPSEC_ULPROTO_ANY) {
6744 switch (sp->spidx.dst.sa.sa_family) {
6745 case AF_INET:
6746 if (sp->spidx.dst.sin.sin_port != IPSEC_PORT_ANY) {
6747 addr.sin.sin_port = sp->spidx.dst.sin.sin_port;
6748 mask = sp->spidx.prefd;
6749 }
6750 break;
6751 case AF_INET6:
6752 if (sp->spidx.dst.sin6.sin6_port != IPSEC_PORT_ANY) {
6753 addr.sin6.sin6_port =
6754 sp->spidx.dst.sin6.sin6_port;
6755 mask = sp->spidx.prefd;
6756 }
6757 break;
6758 default:
6759 break;
6760 }
6761 }
6762 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &addr.sa, mask, ul_proto);
6763 if (!m) {
6764 error = ENOBUFS;
6765 goto fail;
6766 }
6767 m_cat(result, m);
6768
6769 /* XXX proxy address (optional) */
6770
6771 /*
6772 * Set sadb_x_policy. This is KAME extension to RFC2367.
6773 */
6774 if (sp != NULL) {
6775 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id,
6776 sp->priority);
6777 if (!m) {
6778 error = ENOBUFS;
6779 goto fail;
6780 }
6781 m_cat(result, m);
6782 }
6783
6784 /*
6785 * Set sadb_x_sa2 extension if saidx->reqid is not zero.
6786 * This is FreeBSD extension to RFC2367.
6787 */
6788 if (saidx->reqid != 0) {
6789 m = key_setsadbxsa2(saidx->mode, 0, saidx->reqid);
6790 if (m == NULL) {
6791 error = ENOBUFS;
6792 goto fail;
6793 }
6794 m_cat(result, m);
6795 }
6796 /* XXX identity (optional) */
6797 #if 0
6798 if (idexttype && fqdn) {
6799 /* create identity extension (FQDN) */
6800 struct sadb_ident *id;
6801 int fqdnlen;
6802
6803 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */
6804 id = (struct sadb_ident *)p;
6805 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
6806 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
6807 id->sadb_ident_exttype = idexttype;
6808 id->sadb_ident_type = SADB_IDENTTYPE_FQDN;
6809 bcopy(fqdn, id + 1, fqdnlen);
6810 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen);
6811 }
6812
6813 if (idexttype) {
6814 /* create identity extension (USERFQDN) */
6815 struct sadb_ident *id;
6816 int userfqdnlen;
6817
6818 if (userfqdn) {
6819 /* +1 for terminating-NUL */
6820 userfqdnlen = strlen(userfqdn) + 1;
6821 } else
6822 userfqdnlen = 0;
6823 id = (struct sadb_ident *)p;
6824 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
6825 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
6826 id->sadb_ident_exttype = idexttype;
6827 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN;
6828 /* XXX is it correct? */
6829 if (curproc && curproc->p_cred)
6830 id->sadb_ident_id = curproc->p_cred->p_ruid;
6831 if (userfqdn && userfqdnlen)
6832 bcopy(userfqdn, id + 1, userfqdnlen);
6833 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen);
6834 }
6835 #endif
6836
6837 /* XXX sensitivity (optional) */
6838
6839 /* create proposal/combination extension */
6840 m = key_getprop(saidx);
6841 #if 0
6842 /*
6843 * spec conformant: always attach proposal/combination extension,
6844 * the problem is that we have no way to attach it for ipcomp,
6845 * due to the way sadb_comb is declared in RFC2367.
6846 */
6847 if (!m) {
6848 error = ENOBUFS;
6849 goto fail;
6850 }
6851 m_cat(result, m);
6852 #else
6853 /*
6854 * outside of spec; make proposal/combination extension optional.
6855 */
6856 if (m)
6857 m_cat(result, m);
6858 #endif
6859
6860 if ((result->m_flags & M_PKTHDR) == 0) {
6861 error = EINVAL;
6862 goto fail;
6863 }
6864
6865 if (result->m_len < sizeof(struct sadb_msg)) {
6866 result = m_pullup(result, sizeof(struct sadb_msg));
6867 if (result == NULL) {
6868 error = ENOBUFS;
6869 goto fail;
6870 }
6871 }
6872
6873 result->m_pkthdr.len = 0;
6874 for (m = result; m; m = m->m_next)
6875 result->m_pkthdr.len += m->m_len;
6876
6877 mtod(result, struct sadb_msg *)->sadb_msg_len =
6878 PFKEY_UNIT64(result->m_pkthdr.len);
6879
6880 KEYDBG(KEY_STAMP,
6881 printf("%s: SP(%p)\n", __func__, sp));
6882 KEYDBG(KEY_DATA, kdebug_secasindex(saidx, NULL));
6883
6884 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
6885
6886 fail:
6887 if (result)
6888 m_freem(result);
6889 return error;
6890 }
6891
6892 static uint32_t
key_newacq(const struct secasindex * saidx,int * perror)6893 key_newacq(const struct secasindex *saidx, int *perror)
6894 {
6895 struct secacq *acq;
6896 uint32_t seq;
6897
6898 acq = malloc(sizeof(*acq), M_IPSEC_SAQ, M_NOWAIT | M_ZERO);
6899 if (acq == NULL) {
6900 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
6901 *perror = ENOBUFS;
6902 return (0);
6903 }
6904
6905 /* copy secindex */
6906 bcopy(saidx, &acq->saidx, sizeof(acq->saidx));
6907 acq->created = time_second;
6908 acq->count = 0;
6909
6910 /* add to acqtree */
6911 ACQ_LOCK();
6912 seq = acq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq);
6913 LIST_INSERT_HEAD(&V_acqtree, acq, chain);
6914 LIST_INSERT_HEAD(ACQADDRHASH_HASH(saidx), acq, addrhash);
6915 LIST_INSERT_HEAD(ACQSEQHASH_HASH(seq), acq, seqhash);
6916 ACQ_UNLOCK();
6917 *perror = 0;
6918 return (seq);
6919 }
6920
6921 static uint32_t
key_getacq(const struct secasindex * saidx,int * perror)6922 key_getacq(const struct secasindex *saidx, int *perror)
6923 {
6924 struct secacq *acq;
6925 uint32_t seq;
6926
6927 ACQ_LOCK();
6928 LIST_FOREACH(acq, ACQADDRHASH_HASH(saidx), addrhash) {
6929 if (key_cmpsaidx(&acq->saidx, saidx, CMP_EXACTLY)) {
6930 if (acq->count > V_key_blockacq_count) {
6931 /*
6932 * Reset counter and send message.
6933 * Also reset created time to keep ACQ for
6934 * this saidx.
6935 */
6936 acq->created = time_second;
6937 acq->count = 0;
6938 seq = acq->seq;
6939 } else {
6940 /*
6941 * Increment counter and do nothing.
6942 * We send SADB_ACQUIRE message only
6943 * for each V_key_blockacq_count packet.
6944 */
6945 acq->count++;
6946 seq = 0;
6947 }
6948 break;
6949 }
6950 }
6951 ACQ_UNLOCK();
6952 if (acq != NULL) {
6953 *perror = 0;
6954 return (seq);
6955 }
6956 /* allocate new entry */
6957 return (key_newacq(saidx, perror));
6958 }
6959
6960 static int
key_acqreset(uint32_t seq)6961 key_acqreset(uint32_t seq)
6962 {
6963 struct secacq *acq;
6964
6965 ACQ_LOCK();
6966 LIST_FOREACH(acq, ACQSEQHASH_HASH(seq), seqhash) {
6967 if (acq->seq == seq) {
6968 acq->count = 0;
6969 acq->created = time_second;
6970 break;
6971 }
6972 }
6973 ACQ_UNLOCK();
6974 if (acq == NULL)
6975 return (ESRCH);
6976 return (0);
6977 }
6978 /*
6979 * Mark ACQ entry as stale to remove it in key_flush_acq().
6980 * Called after successful SADB_GETSPI message.
6981 */
6982 static int
key_acqdone(const struct secasindex * saidx,uint32_t seq)6983 key_acqdone(const struct secasindex *saidx, uint32_t seq)
6984 {
6985 struct secacq *acq;
6986
6987 ACQ_LOCK();
6988 LIST_FOREACH(acq, ACQSEQHASH_HASH(seq), seqhash) {
6989 if (acq->seq == seq)
6990 break;
6991 }
6992 if (acq != NULL) {
6993 if (key_cmpsaidx(&acq->saidx, saidx, CMP_EXACTLY) == 0) {
6994 ipseclog((LOG_DEBUG,
6995 "%s: Mismatched saidx for ACQ %u\n", __func__, seq));
6996 acq = NULL;
6997 } else {
6998 acq->created = 0;
6999 }
7000 } else {
7001 ipseclog((LOG_DEBUG,
7002 "%s: ACQ %u is not found.\n", __func__, seq));
7003 }
7004 ACQ_UNLOCK();
7005 if (acq == NULL)
7006 return (ESRCH);
7007 return (0);
7008 }
7009
7010 static struct secspacq *
key_newspacq(struct secpolicyindex * spidx)7011 key_newspacq(struct secpolicyindex *spidx)
7012 {
7013 struct secspacq *acq;
7014
7015 /* get new entry */
7016 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO);
7017 if (acq == NULL) {
7018 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
7019 return NULL;
7020 }
7021
7022 /* copy secindex */
7023 bcopy(spidx, &acq->spidx, sizeof(acq->spidx));
7024 acq->created = time_second;
7025 acq->count = 0;
7026
7027 /* add to spacqtree */
7028 SPACQ_LOCK();
7029 LIST_INSERT_HEAD(&V_spacqtree, acq, chain);
7030 SPACQ_UNLOCK();
7031
7032 return acq;
7033 }
7034
7035 static struct secspacq *
key_getspacq(struct secpolicyindex * spidx)7036 key_getspacq(struct secpolicyindex *spidx)
7037 {
7038 struct secspacq *acq;
7039
7040 SPACQ_LOCK();
7041 LIST_FOREACH(acq, &V_spacqtree, chain) {
7042 if (key_cmpspidx_exactly(spidx, &acq->spidx)) {
7043 /* NB: return holding spacq_lock */
7044 return acq;
7045 }
7046 }
7047 SPACQ_UNLOCK();
7048
7049 return NULL;
7050 }
7051
7052 /*
7053 * SADB_ACQUIRE processing,
7054 * in first situation, is receiving
7055 * <base>
7056 * from the ikmpd, and clear sequence of its secasvar entry.
7057 *
7058 * In second situation, is receiving
7059 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
7060 * from a user land process, and return
7061 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
7062 * to the socket.
7063 *
7064 * m will always be freed.
7065 */
7066 static int
key_acquire2(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7067 key_acquire2(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7068 {
7069 SAHTREE_RLOCK_TRACKER;
7070 struct sadb_address *src0, *dst0;
7071 struct secasindex saidx;
7072 struct secashead *sah;
7073 uint32_t reqid;
7074 int error;
7075 uint8_t mode, proto;
7076
7077 IPSEC_ASSERT(so != NULL, ("null socket"));
7078 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7079 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7080 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7081
7082 /*
7083 * Error message from KMd.
7084 * We assume that if error was occurred in IKEd, the length of PFKEY
7085 * message is equal to the size of sadb_msg structure.
7086 * We do not raise error even if error occurred in this function.
7087 */
7088 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) {
7089 /* check sequence number */
7090 if (mhp->msg->sadb_msg_seq == 0 ||
7091 mhp->msg->sadb_msg_errno == 0) {
7092 ipseclog((LOG_DEBUG, "%s: must specify sequence "
7093 "number and errno.\n", __func__));
7094 } else {
7095 /*
7096 * IKEd reported that error occurred.
7097 * XXXAE: what it expects from the kernel?
7098 * Probably we should send SADB_ACQUIRE again?
7099 * If so, reset ACQ's state.
7100 * XXXAE: it looks useless.
7101 */
7102 key_acqreset(mhp->msg->sadb_msg_seq);
7103 }
7104 m_freem(m);
7105 return (0);
7106 }
7107
7108 /*
7109 * This message is from user land.
7110 */
7111
7112 /* map satype to proto */
7113 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7114 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7115 __func__));
7116 return key_senderror(so, m, EINVAL);
7117 }
7118
7119 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
7120 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
7121 SADB_CHECKHDR(mhp, SADB_EXT_PROPOSAL)) {
7122 ipseclog((LOG_DEBUG,
7123 "%s: invalid message: missing required header.\n",
7124 __func__));
7125 return key_senderror(so, m, EINVAL);
7126 }
7127 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
7128 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
7129 SADB_CHECKLEN(mhp, SADB_EXT_PROPOSAL)) {
7130 ipseclog((LOG_DEBUG,
7131 "%s: invalid message: wrong header size.\n", __func__));
7132 return key_senderror(so, m, EINVAL);
7133 }
7134
7135 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
7136 mode = IPSEC_MODE_ANY;
7137 reqid = 0;
7138 } else {
7139 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
7140 ipseclog((LOG_DEBUG,
7141 "%s: invalid message: wrong header size.\n",
7142 __func__));
7143 return key_senderror(so, m, EINVAL);
7144 }
7145 mode = ((struct sadb_x_sa2 *)
7146 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
7147 reqid = ((struct sadb_x_sa2 *)
7148 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
7149 }
7150
7151 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
7152 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
7153
7154 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
7155 (struct sockaddr *)(dst0 + 1));
7156 if (error != 0) {
7157 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
7158 return key_senderror(so, m, EINVAL);
7159 }
7160 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
7161
7162 /* get a SA index */
7163 SAHTREE_RLOCK();
7164 LIST_FOREACH(sah, SAHADDRHASH_HASH(&saidx), addrhash) {
7165 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID))
7166 break;
7167 }
7168 SAHTREE_RUNLOCK();
7169 if (sah != NULL) {
7170 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__));
7171 return key_senderror(so, m, EEXIST);
7172 }
7173
7174 error = key_acquire(&saidx, NULL);
7175 if (error != 0) {
7176 ipseclog((LOG_DEBUG,
7177 "%s: error %d returned from key_acquire()\n",
7178 __func__, error));
7179 return key_senderror(so, m, error);
7180 }
7181 m_freem(m);
7182 return (0);
7183 }
7184
7185 /*
7186 * SADB_REGISTER processing.
7187 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported.
7188 * receive
7189 * <base>
7190 * from the ikmpd, and register a socket to send PF_KEY messages,
7191 * and send
7192 * <base, supported>
7193 * to KMD by PF_KEY.
7194 * If socket is detached, must free from regnode.
7195 *
7196 * m will always be freed.
7197 */
7198 static int
key_register(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7199 key_register(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7200 {
7201 struct secreg *reg, *newreg = NULL;
7202
7203 IPSEC_ASSERT(so != NULL, ("null socket"));
7204 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7205 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7206 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7207
7208 /* check for invalid register message */
7209 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0]))
7210 return key_senderror(so, m, EINVAL);
7211
7212 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */
7213 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC)
7214 goto setmsg;
7215
7216 /* check whether existing or not */
7217 REGTREE_LOCK();
7218 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) {
7219 if (reg->so == so) {
7220 REGTREE_UNLOCK();
7221 ipseclog((LOG_DEBUG, "%s: socket exists already.\n",
7222 __func__));
7223 return key_senderror(so, m, EEXIST);
7224 }
7225 }
7226
7227 /* create regnode */
7228 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO);
7229 if (newreg == NULL) {
7230 REGTREE_UNLOCK();
7231 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
7232 return key_senderror(so, m, ENOBUFS);
7233 }
7234
7235 newreg->so = so;
7236 ((struct keycb *)(so->so_pcb))->kp_registered++;
7237
7238 /* add regnode to regtree. */
7239 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain);
7240 REGTREE_UNLOCK();
7241
7242 setmsg:
7243 {
7244 struct mbuf *n;
7245 struct sadb_msg *newmsg;
7246 struct sadb_supported *sup;
7247 u_int len, alen, elen;
7248 int off;
7249 int i;
7250 struct sadb_alg *alg;
7251
7252 /* create new sadb_msg to reply. */
7253 alen = 0;
7254 for (i = 1; i <= SADB_AALG_MAX; i++) {
7255 if (auth_algorithm_lookup(i))
7256 alen += sizeof(struct sadb_alg);
7257 }
7258 if (alen)
7259 alen += sizeof(struct sadb_supported);
7260 elen = 0;
7261 for (i = 1; i <= SADB_EALG_MAX; i++) {
7262 if (enc_algorithm_lookup(i))
7263 elen += sizeof(struct sadb_alg);
7264 }
7265 if (elen)
7266 elen += sizeof(struct sadb_supported);
7267
7268 len = sizeof(struct sadb_msg) + alen + elen;
7269
7270 if (len > MCLBYTES)
7271 return key_senderror(so, m, ENOBUFS);
7272
7273 n = key_mget(len);
7274 if (n == NULL)
7275 return key_senderror(so, m, ENOBUFS);
7276
7277 n->m_pkthdr.len = n->m_len = len;
7278 n->m_next = NULL;
7279 off = 0;
7280
7281 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
7282 newmsg = mtod(n, struct sadb_msg *);
7283 newmsg->sadb_msg_errno = 0;
7284 newmsg->sadb_msg_len = PFKEY_UNIT64(len);
7285 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
7286
7287 /* for authentication algorithm */
7288 if (alen) {
7289 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
7290 sup->sadb_supported_len = PFKEY_UNIT64(alen);
7291 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
7292 off += PFKEY_ALIGN8(sizeof(*sup));
7293
7294 for (i = 1; i <= SADB_AALG_MAX; i++) {
7295 const struct auth_hash *aalgo;
7296 u_int16_t minkeysize, maxkeysize;
7297
7298 aalgo = auth_algorithm_lookup(i);
7299 if (!aalgo)
7300 continue;
7301 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
7302 alg->sadb_alg_id = i;
7303 alg->sadb_alg_ivlen = 0;
7304 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize);
7305 alg->sadb_alg_minbits = _BITS(minkeysize);
7306 alg->sadb_alg_maxbits = _BITS(maxkeysize);
7307 off += PFKEY_ALIGN8(sizeof(*alg));
7308 }
7309 }
7310
7311 /* for encryption algorithm */
7312 if (elen) {
7313 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
7314 sup->sadb_supported_len = PFKEY_UNIT64(elen);
7315 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
7316 off += PFKEY_ALIGN8(sizeof(*sup));
7317
7318 for (i = 1; i <= SADB_EALG_MAX; i++) {
7319 const struct enc_xform *ealgo;
7320
7321 ealgo = enc_algorithm_lookup(i);
7322 if (!ealgo)
7323 continue;
7324 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
7325 alg->sadb_alg_id = i;
7326 alg->sadb_alg_ivlen = ealgo->ivsize;
7327 alg->sadb_alg_minbits = _BITS(ealgo->minkey);
7328 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey);
7329 off += PFKEY_ALIGN8(sizeof(struct sadb_alg));
7330 }
7331 }
7332
7333 IPSEC_ASSERT(off == len,
7334 ("length assumption failed (off %u len %u)", off, len));
7335
7336 m_freem(m);
7337 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED);
7338 }
7339 }
7340
7341 /*
7342 * free secreg entry registered.
7343 * XXX: I want to do free a socket marked done SADB_RESIGER to socket.
7344 */
7345 void
key_freereg(struct socket * so)7346 key_freereg(struct socket *so)
7347 {
7348 struct secreg *reg;
7349 int i;
7350
7351 IPSEC_ASSERT(so != NULL, ("NULL so"));
7352
7353 /*
7354 * check whether existing or not.
7355 * check all type of SA, because there is a potential that
7356 * one socket is registered to multiple type of SA.
7357 */
7358 REGTREE_LOCK();
7359 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
7360 LIST_FOREACH(reg, &V_regtree[i], chain) {
7361 if (reg->so == so && __LIST_CHAINED(reg)) {
7362 LIST_REMOVE(reg, chain);
7363 free(reg, M_IPSEC_SAR);
7364 break;
7365 }
7366 }
7367 }
7368 REGTREE_UNLOCK();
7369 }
7370
7371 /*
7372 * SADB_EXPIRE processing
7373 * send
7374 * <base, SA, SA2, lifetime(C and one of HS), address(SD)>
7375 * to KMD by PF_KEY.
7376 * NOTE: We send only soft lifetime extension.
7377 *
7378 * OUT: 0 : succeed
7379 * others : error number
7380 */
7381 static int
key_expire(struct secasvar * sav,int hard)7382 key_expire(struct secasvar *sav, int hard)
7383 {
7384 struct mbuf *result = NULL, *m;
7385 struct sadb_lifetime *lt;
7386 uint32_t replay_count;
7387 int error, len;
7388 uint8_t satype;
7389
7390 SECASVAR_RLOCK_TRACKER;
7391
7392 IPSEC_ASSERT (sav != NULL, ("null sav"));
7393 IPSEC_ASSERT (sav->sah != NULL, ("null sa header"));
7394
7395 KEYDBG(KEY_STAMP,
7396 printf("%s: SA(%p) expired %s lifetime\n", __func__,
7397 sav, hard ? "hard": "soft"));
7398 KEYDBG(KEY_DATA, kdebug_secasv(sav));
7399 /* set msg header */
7400 satype = key_proto2satype(sav->sah->saidx.proto);
7401 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype));
7402 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt);
7403 if (!m) {
7404 error = ENOBUFS;
7405 goto fail;
7406 }
7407 result = m;
7408
7409 /* create SA extension */
7410 m = key_setsadbsa(sav);
7411 if (!m) {
7412 error = ENOBUFS;
7413 goto fail;
7414 }
7415 m_cat(result, m);
7416
7417 /* create SA extension */
7418 SECASVAR_RLOCK(sav);
7419 replay_count = sav->replay ? sav->replay->count : 0;
7420 SECASVAR_RUNLOCK(sav);
7421
7422 m = key_setsadbxsa2(sav->sah->saidx.mode, replay_count,
7423 sav->sah->saidx.reqid);
7424 if (!m) {
7425 error = ENOBUFS;
7426 goto fail;
7427 }
7428 m_cat(result, m);
7429
7430 if (sav->replay && sav->replay->wsize > UINT8_MAX) {
7431 m = key_setsadbxsareplay(sav->replay->wsize);
7432 if (!m) {
7433 error = ENOBUFS;
7434 goto fail;
7435 }
7436 m_cat(result, m);
7437 }
7438
7439 /* create lifetime extension (current and soft) */
7440 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
7441 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
7442 if (m == NULL) {
7443 error = ENOBUFS;
7444 goto fail;
7445 }
7446 m_align(m, len);
7447 m->m_len = len;
7448 bzero(mtod(m, caddr_t), len);
7449 lt = mtod(m, struct sadb_lifetime *);
7450 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
7451 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
7452 lt->sadb_lifetime_allocations =
7453 (uint32_t)counter_u64_fetch(sav->lft_c_allocations);
7454 lt->sadb_lifetime_bytes =
7455 counter_u64_fetch(sav->lft_c_bytes);
7456 lt->sadb_lifetime_addtime = sav->created;
7457 lt->sadb_lifetime_usetime = sav->firstused;
7458 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
7459 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
7460 if (hard) {
7461 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
7462 lt->sadb_lifetime_allocations = sav->lft_h->allocations;
7463 lt->sadb_lifetime_bytes = sav->lft_h->bytes;
7464 lt->sadb_lifetime_addtime = sav->lft_h->addtime;
7465 lt->sadb_lifetime_usetime = sav->lft_h->usetime;
7466 } else {
7467 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
7468 lt->sadb_lifetime_allocations = sav->lft_s->allocations;
7469 lt->sadb_lifetime_bytes = sav->lft_s->bytes;
7470 lt->sadb_lifetime_addtime = sav->lft_s->addtime;
7471 lt->sadb_lifetime_usetime = sav->lft_s->usetime;
7472 }
7473 m_cat(result, m);
7474
7475 /* set sadb_address for source */
7476 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
7477 &sav->sah->saidx.src.sa,
7478 FULLMASK, IPSEC_ULPROTO_ANY);
7479 if (!m) {
7480 error = ENOBUFS;
7481 goto fail;
7482 }
7483 m_cat(result, m);
7484
7485 /* set sadb_address for destination */
7486 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
7487 &sav->sah->saidx.dst.sa,
7488 FULLMASK, IPSEC_ULPROTO_ANY);
7489 if (!m) {
7490 error = ENOBUFS;
7491 goto fail;
7492 }
7493 m_cat(result, m);
7494
7495 /*
7496 * XXX-BZ Handle NAT-T extensions here.
7497 * XXXAE: it doesn't seem quite useful. IKEs should not depend on
7498 * this information, we report only significant SA fields.
7499 */
7500
7501 if ((result->m_flags & M_PKTHDR) == 0) {
7502 error = EINVAL;
7503 goto fail;
7504 }
7505
7506 if (result->m_len < sizeof(struct sadb_msg)) {
7507 result = m_pullup(result, sizeof(struct sadb_msg));
7508 if (result == NULL) {
7509 error = ENOBUFS;
7510 goto fail;
7511 }
7512 }
7513
7514 result->m_pkthdr.len = 0;
7515 for (m = result; m; m = m->m_next)
7516 result->m_pkthdr.len += m->m_len;
7517
7518 mtod(result, struct sadb_msg *)->sadb_msg_len =
7519 PFKEY_UNIT64(result->m_pkthdr.len);
7520
7521 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
7522
7523 fail:
7524 if (result)
7525 m_freem(result);
7526 return error;
7527 }
7528
7529 static void
key_freesah_flushed(struct secashead_queue * flushq)7530 key_freesah_flushed(struct secashead_queue *flushq)
7531 {
7532 struct secashead *sah, *nextsah;
7533 struct secasvar *sav, *nextsav;
7534
7535 sah = TAILQ_FIRST(flushq);
7536 while (sah != NULL) {
7537 sav = TAILQ_FIRST(&sah->savtree_larval);
7538 while (sav != NULL) {
7539 nextsav = TAILQ_NEXT(sav, chain);
7540 TAILQ_REMOVE(&sah->savtree_larval, sav, chain);
7541 key_freesav(&sav); /* release last reference */
7542 key_freesah(&sah); /* release reference from SAV */
7543 sav = nextsav;
7544 }
7545 sav = TAILQ_FIRST(&sah->savtree_alive);
7546 while (sav != NULL) {
7547 nextsav = TAILQ_NEXT(sav, chain);
7548 TAILQ_REMOVE(&sah->savtree_alive, sav, chain);
7549 key_freesav(&sav); /* release last reference */
7550 key_freesah(&sah); /* release reference from SAV */
7551 sav = nextsav;
7552 }
7553 nextsah = TAILQ_NEXT(sah, chain);
7554 key_freesah(&sah); /* release last reference */
7555 sah = nextsah;
7556 }
7557 }
7558
7559 /*
7560 * SADB_FLUSH processing
7561 * receive
7562 * <base>
7563 * from the ikmpd, and free all entries in secastree.
7564 * and send,
7565 * <base>
7566 * to the ikmpd.
7567 * NOTE: to do is only marking SADB_SASTATE_DEAD.
7568 *
7569 * m will always be freed.
7570 */
7571 static int
key_flush(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7572 key_flush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7573 {
7574 struct secashead_queue flushq;
7575 struct sadb_msg *newmsg;
7576 struct secashead *sah, *nextsah;
7577 struct secasvar *sav;
7578 uint8_t proto;
7579 int i;
7580
7581 IPSEC_ASSERT(so != NULL, ("null socket"));
7582 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7583 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7584
7585 /* map satype to proto */
7586 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7587 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7588 __func__));
7589 return key_senderror(so, m, EINVAL);
7590 }
7591 KEYDBG(KEY_STAMP,
7592 printf("%s: proto %u\n", __func__, proto));
7593
7594 TAILQ_INIT(&flushq);
7595 if (proto == IPSEC_PROTO_ANY) {
7596 /* no SATYPE specified, i.e. flushing all SA. */
7597 SAHTREE_WLOCK();
7598 /* Move all SAHs into flushq */
7599 TAILQ_CONCAT(&flushq, &V_sahtree, chain);
7600 /* Flush all buckets in SPI hash */
7601 for (i = 0; i < V_savhash_mask + 1; i++)
7602 LIST_INIT(&V_savhashtbl[i]);
7603 /* Flush all buckets in SAHADDRHASH */
7604 for (i = 0; i < V_sahaddrhash_mask + 1; i++)
7605 LIST_INIT(&V_sahaddrhashtbl[i]);
7606 /* Mark all SAHs as unlinked */
7607 TAILQ_FOREACH(sah, &flushq, chain) {
7608 sah->state = SADB_SASTATE_DEAD;
7609 /*
7610 * Callout handler makes its job using
7611 * RLOCK and drain queues. In case, when this
7612 * function will be called just before it
7613 * acquires WLOCK, we need to mark SAs as
7614 * unlinked to prevent second unlink.
7615 */
7616 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7617 sav->state = SADB_SASTATE_DEAD;
7618 }
7619 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7620 sav->state = SADB_SASTATE_DEAD;
7621 }
7622 }
7623 SAHTREE_WUNLOCK();
7624 } else {
7625 SAHTREE_WLOCK();
7626 sah = TAILQ_FIRST(&V_sahtree);
7627 while (sah != NULL) {
7628 IPSEC_ASSERT(sah->state != SADB_SASTATE_DEAD,
7629 ("DEAD SAH %p in SADB_FLUSH", sah));
7630 nextsah = TAILQ_NEXT(sah, chain);
7631 if (sah->saidx.proto != proto) {
7632 sah = nextsah;
7633 continue;
7634 }
7635 sah->state = SADB_SASTATE_DEAD;
7636 TAILQ_REMOVE(&V_sahtree, sah, chain);
7637 LIST_REMOVE(sah, addrhash);
7638 /* Unlink all SAs from SPI hash */
7639 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7640 LIST_REMOVE(sav, spihash);
7641 sav->state = SADB_SASTATE_DEAD;
7642 }
7643 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7644 LIST_REMOVE(sav, spihash);
7645 sav->state = SADB_SASTATE_DEAD;
7646 }
7647 /* Add SAH into flushq */
7648 TAILQ_INSERT_HEAD(&flushq, sah, chain);
7649 sah = nextsah;
7650 }
7651 SAHTREE_WUNLOCK();
7652 }
7653
7654 key_freesah_flushed(&flushq);
7655 /* Free all queued SAs and SAHs */
7656 if (m->m_len < sizeof(struct sadb_msg) ||
7657 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
7658 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
7659 return key_senderror(so, m, ENOBUFS);
7660 }
7661
7662 if (m->m_next)
7663 m_freem(m->m_next);
7664 m->m_next = NULL;
7665 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg);
7666 newmsg = mtod(m, struct sadb_msg *);
7667 newmsg->sadb_msg_errno = 0;
7668 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
7669
7670 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7671 }
7672
7673 /*
7674 * SADB_DUMP processing
7675 * dump all entries including status of DEAD in SAD.
7676 * receive
7677 * <base>
7678 * from the ikmpd, and dump all secasvar leaves
7679 * and send,
7680 * <base> .....
7681 * to the ikmpd.
7682 *
7683 * m will always be freed.
7684 */
7685 static int
key_dump(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7686 key_dump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7687 {
7688 SAHTREE_RLOCK_TRACKER;
7689 struct secashead *sah;
7690 struct secasvar *sav;
7691 struct mbuf *n;
7692 uint32_t cnt;
7693 uint8_t proto, satype;
7694
7695 IPSEC_ASSERT(so != NULL, ("null socket"));
7696 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7697 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7698 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7699
7700 /* map satype to proto */
7701 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7702 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7703 __func__));
7704 return key_senderror(so, m, EINVAL);
7705 }
7706
7707 /* count sav entries to be sent to the userland. */
7708 cnt = 0;
7709 SAHTREE_RLOCK();
7710 TAILQ_FOREACH(sah, &V_sahtree, chain) {
7711 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
7712 proto != sah->saidx.proto)
7713 continue;
7714
7715 TAILQ_FOREACH(sav, &sah->savtree_larval, chain)
7716 cnt++;
7717 TAILQ_FOREACH(sav, &sah->savtree_alive, chain)
7718 cnt++;
7719 }
7720
7721 if (cnt == 0) {
7722 SAHTREE_RUNLOCK();
7723 return key_senderror(so, m, ENOENT);
7724 }
7725
7726 /* send this to the userland, one at a time. */
7727 TAILQ_FOREACH(sah, &V_sahtree, chain) {
7728 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
7729 proto != sah->saidx.proto)
7730 continue;
7731
7732 /* map proto to satype */
7733 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
7734 SAHTREE_RUNLOCK();
7735 ipseclog((LOG_DEBUG, "%s: there was invalid proto in "
7736 "SAD.\n", __func__));
7737 return key_senderror(so, m, EINVAL);
7738 }
7739 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7740 n = key_setdumpsa(sav, SADB_DUMP, satype,
7741 --cnt, mhp->msg->sadb_msg_pid);
7742 if (n == NULL) {
7743 SAHTREE_RUNLOCK();
7744 return key_senderror(so, m, ENOBUFS);
7745 }
7746 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
7747 }
7748 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7749 n = key_setdumpsa(sav, SADB_DUMP, satype,
7750 --cnt, mhp->msg->sadb_msg_pid);
7751 if (n == NULL) {
7752 SAHTREE_RUNLOCK();
7753 return key_senderror(so, m, ENOBUFS);
7754 }
7755 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
7756 }
7757 }
7758 SAHTREE_RUNLOCK();
7759 m_freem(m);
7760 return (0);
7761 }
7762 /*
7763 * SADB_X_PROMISC processing
7764 *
7765 * m will always be freed.
7766 */
7767 static int
key_promisc(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7768 key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7769 {
7770 int olen;
7771
7772 IPSEC_ASSERT(so != NULL, ("null socket"));
7773 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7774 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7775 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7776
7777 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
7778
7779 if (olen < sizeof(struct sadb_msg)) {
7780 #if 1
7781 return key_senderror(so, m, EINVAL);
7782 #else
7783 m_freem(m);
7784 return 0;
7785 #endif
7786 } else if (olen == sizeof(struct sadb_msg)) {
7787 /* enable/disable promisc mode */
7788 struct keycb *kp;
7789
7790 if ((kp = so->so_pcb) == NULL)
7791 return key_senderror(so, m, EINVAL);
7792 mhp->msg->sadb_msg_errno = 0;
7793 switch (mhp->msg->sadb_msg_satype) {
7794 case 0:
7795 case 1:
7796 kp->kp_promisc = mhp->msg->sadb_msg_satype;
7797 break;
7798 default:
7799 return key_senderror(so, m, EINVAL);
7800 }
7801
7802 /* send the original message back to everyone */
7803 mhp->msg->sadb_msg_errno = 0;
7804 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7805 } else {
7806 /* send packet as is */
7807
7808 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg)));
7809
7810 /* TODO: if sadb_msg_seq is specified, send to specific pid */
7811 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7812 }
7813 }
7814
7815 static int (*key_typesw[])(struct socket *, struct mbuf *,
7816 const struct sadb_msghdr *) = {
7817 [SADB_RESERVED] = NULL,
7818 [SADB_GETSPI] = key_getspi,
7819 [SADB_UPDATE] = key_update,
7820 [SADB_ADD] = key_add,
7821 [SADB_DELETE] = key_delete,
7822 [SADB_GET] = key_get,
7823 [SADB_ACQUIRE] = key_acquire2,
7824 [SADB_REGISTER] = key_register,
7825 [SADB_EXPIRE] = NULL,
7826 [SADB_FLUSH] = key_flush,
7827 [SADB_DUMP] = key_dump,
7828 [SADB_X_PROMISC] = key_promisc,
7829 [SADB_X_PCHANGE] = NULL,
7830 [SADB_X_SPDUPDATE] = key_spdadd,
7831 [SADB_X_SPDADD] = key_spdadd,
7832 [SADB_X_SPDDELETE] = key_spddelete,
7833 [SADB_X_SPDGET] = key_spdget,
7834 [SADB_X_SPDACQUIRE] = NULL,
7835 [SADB_X_SPDDUMP] = key_spddump,
7836 [SADB_X_SPDFLUSH] = key_spdflush,
7837 [SADB_X_SPDSETIDX] = key_spdadd,
7838 [SADB_X_SPDEXPIRE] = NULL,
7839 [SADB_X_SPDDELETE2] = key_spddelete2,
7840 };
7841
7842 /*
7843 * parse sadb_msg buffer to process PFKEYv2,
7844 * and create a data to response if needed.
7845 * I think to be dealed with mbuf directly.
7846 * IN:
7847 * msgp : pointer to pointer to a received buffer pulluped.
7848 * This is rewrited to response.
7849 * so : pointer to socket.
7850 * OUT:
7851 * length for buffer to send to user process.
7852 */
7853 int
key_parse(struct mbuf * m,struct socket * so)7854 key_parse(struct mbuf *m, struct socket *so)
7855 {
7856 struct sadb_msg *msg;
7857 struct sadb_msghdr mh;
7858 u_int orglen;
7859 int error;
7860 int target;
7861
7862 IPSEC_ASSERT(so != NULL, ("null socket"));
7863 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7864
7865 if (m->m_len < sizeof(struct sadb_msg)) {
7866 m = m_pullup(m, sizeof(struct sadb_msg));
7867 if (!m)
7868 return ENOBUFS;
7869 }
7870 msg = mtod(m, struct sadb_msg *);
7871 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len);
7872 target = KEY_SENDUP_ONE;
7873
7874 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len != orglen) {
7875 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__));
7876 PFKEYSTAT_INC(out_invlen);
7877 error = EINVAL;
7878 goto senderror;
7879 }
7880
7881 if (msg->sadb_msg_version != PF_KEY_V2) {
7882 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n",
7883 __func__, msg->sadb_msg_version));
7884 PFKEYSTAT_INC(out_invver);
7885 error = EINVAL;
7886 goto senderror;
7887 }
7888
7889 if (msg->sadb_msg_type > SADB_MAX) {
7890 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
7891 __func__, msg->sadb_msg_type));
7892 PFKEYSTAT_INC(out_invmsgtype);
7893 error = EINVAL;
7894 goto senderror;
7895 }
7896
7897 /* for old-fashioned code - should be nuked */
7898 if (m->m_pkthdr.len > MCLBYTES) {
7899 m_freem(m);
7900 return ENOBUFS;
7901 }
7902 if (m->m_next) {
7903 struct mbuf *n;
7904
7905 n = key_mget(m->m_pkthdr.len);
7906 if (n == NULL) {
7907 m_freem(m);
7908 return ENOBUFS;
7909 }
7910 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
7911 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len;
7912 n->m_next = NULL;
7913 m_freem(m);
7914 m = n;
7915 }
7916
7917 /* align the mbuf chain so that extensions are in contiguous region. */
7918 error = key_align(m, &mh);
7919 if (error)
7920 return error;
7921
7922 msg = mh.msg;
7923
7924 /* We use satype as scope mask for spddump */
7925 if (msg->sadb_msg_type == SADB_X_SPDDUMP) {
7926 switch (msg->sadb_msg_satype) {
7927 case IPSEC_POLICYSCOPE_ANY:
7928 case IPSEC_POLICYSCOPE_GLOBAL:
7929 case IPSEC_POLICYSCOPE_IFNET:
7930 case IPSEC_POLICYSCOPE_PCB:
7931 break;
7932 default:
7933 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
7934 __func__, msg->sadb_msg_type));
7935 PFKEYSTAT_INC(out_invsatype);
7936 error = EINVAL;
7937 goto senderror;
7938 }
7939 } else {
7940 switch (msg->sadb_msg_satype) { /* check SA type */
7941 case SADB_SATYPE_UNSPEC:
7942 switch (msg->sadb_msg_type) {
7943 case SADB_GETSPI:
7944 case SADB_UPDATE:
7945 case SADB_ADD:
7946 case SADB_DELETE:
7947 case SADB_GET:
7948 case SADB_ACQUIRE:
7949 case SADB_EXPIRE:
7950 ipseclog((LOG_DEBUG, "%s: must specify satype "
7951 "when msg type=%u.\n", __func__,
7952 msg->sadb_msg_type));
7953 PFKEYSTAT_INC(out_invsatype);
7954 error = EINVAL;
7955 goto senderror;
7956 }
7957 break;
7958 case SADB_SATYPE_AH:
7959 case SADB_SATYPE_ESP:
7960 case SADB_X_SATYPE_IPCOMP:
7961 case SADB_X_SATYPE_TCPSIGNATURE:
7962 switch (msg->sadb_msg_type) {
7963 case SADB_X_SPDADD:
7964 case SADB_X_SPDDELETE:
7965 case SADB_X_SPDGET:
7966 case SADB_X_SPDFLUSH:
7967 case SADB_X_SPDSETIDX:
7968 case SADB_X_SPDUPDATE:
7969 case SADB_X_SPDDELETE2:
7970 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
7971 __func__, msg->sadb_msg_type));
7972 PFKEYSTAT_INC(out_invsatype);
7973 error = EINVAL;
7974 goto senderror;
7975 }
7976 break;
7977 case SADB_SATYPE_RSVP:
7978 case SADB_SATYPE_OSPFV2:
7979 case SADB_SATYPE_RIPV2:
7980 case SADB_SATYPE_MIP:
7981 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n",
7982 __func__, msg->sadb_msg_satype));
7983 PFKEYSTAT_INC(out_invsatype);
7984 error = EOPNOTSUPP;
7985 goto senderror;
7986 case 1: /* XXX: What does it do? */
7987 if (msg->sadb_msg_type == SADB_X_PROMISC)
7988 break;
7989 /*FALLTHROUGH*/
7990 default:
7991 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
7992 __func__, msg->sadb_msg_satype));
7993 PFKEYSTAT_INC(out_invsatype);
7994 error = EINVAL;
7995 goto senderror;
7996 }
7997 }
7998
7999 /* check field of upper layer protocol and address family */
8000 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL
8001 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) {
8002 struct sadb_address *src0, *dst0;
8003 u_int plen;
8004
8005 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]);
8006 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]);
8007
8008 /* check upper layer protocol */
8009 if (src0->sadb_address_proto != dst0->sadb_address_proto) {
8010 ipseclog((LOG_DEBUG, "%s: upper layer protocol "
8011 "mismatched.\n", __func__));
8012 PFKEYSTAT_INC(out_invaddr);
8013 error = EINVAL;
8014 goto senderror;
8015 }
8016
8017 /* check family */
8018 if (PFKEY_ADDR_SADDR(src0)->sa_family !=
8019 PFKEY_ADDR_SADDR(dst0)->sa_family) {
8020 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n",
8021 __func__));
8022 PFKEYSTAT_INC(out_invaddr);
8023 error = EINVAL;
8024 goto senderror;
8025 }
8026 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
8027 PFKEY_ADDR_SADDR(dst0)->sa_len) {
8028 ipseclog((LOG_DEBUG, "%s: address struct size "
8029 "mismatched.\n", __func__));
8030 PFKEYSTAT_INC(out_invaddr);
8031 error = EINVAL;
8032 goto senderror;
8033 }
8034
8035 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
8036 case AF_INET:
8037 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
8038 sizeof(struct sockaddr_in)) {
8039 PFKEYSTAT_INC(out_invaddr);
8040 error = EINVAL;
8041 goto senderror;
8042 }
8043 break;
8044 case AF_INET6:
8045 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
8046 sizeof(struct sockaddr_in6)) {
8047 PFKEYSTAT_INC(out_invaddr);
8048 error = EINVAL;
8049 goto senderror;
8050 }
8051 break;
8052 default:
8053 ipseclog((LOG_DEBUG, "%s: unsupported address family\n",
8054 __func__));
8055 PFKEYSTAT_INC(out_invaddr);
8056 error = EAFNOSUPPORT;
8057 goto senderror;
8058 }
8059
8060 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
8061 case AF_INET:
8062 plen = sizeof(struct in_addr) << 3;
8063 break;
8064 case AF_INET6:
8065 plen = sizeof(struct in6_addr) << 3;
8066 break;
8067 default:
8068 plen = 0; /*fool gcc*/
8069 break;
8070 }
8071
8072 /* check max prefix length */
8073 if (src0->sadb_address_prefixlen > plen ||
8074 dst0->sadb_address_prefixlen > plen) {
8075 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n",
8076 __func__));
8077 PFKEYSTAT_INC(out_invaddr);
8078 error = EINVAL;
8079 goto senderror;
8080 }
8081
8082 /*
8083 * prefixlen == 0 is valid because there can be a case when
8084 * all addresses are matched.
8085 */
8086 }
8087
8088 if (msg->sadb_msg_type >= nitems(key_typesw) ||
8089 key_typesw[msg->sadb_msg_type] == NULL) {
8090 PFKEYSTAT_INC(out_invmsgtype);
8091 error = EINVAL;
8092 goto senderror;
8093 }
8094
8095 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh);
8096
8097 senderror:
8098 msg->sadb_msg_errno = error;
8099 return key_sendup_mbuf(so, m, target);
8100 }
8101
8102 static int
key_senderror(struct socket * so,struct mbuf * m,int code)8103 key_senderror(struct socket *so, struct mbuf *m, int code)
8104 {
8105 struct sadb_msg *msg;
8106
8107 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
8108 ("mbuf too small, len %u", m->m_len));
8109
8110 msg = mtod(m, struct sadb_msg *);
8111 msg->sadb_msg_errno = code;
8112 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
8113 }
8114
8115 /*
8116 * set the pointer to each header into message buffer.
8117 * m will be freed on error.
8118 * XXX larger-than-MCLBYTES extension?
8119 */
8120 static int
key_align(struct mbuf * m,struct sadb_msghdr * mhp)8121 key_align(struct mbuf *m, struct sadb_msghdr *mhp)
8122 {
8123 struct mbuf *n;
8124 struct sadb_ext *ext;
8125 size_t off, end;
8126 int extlen;
8127 int toff;
8128
8129 IPSEC_ASSERT(m != NULL, ("null mbuf"));
8130 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
8131 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
8132 ("mbuf too small, len %u", m->m_len));
8133
8134 /* initialize */
8135 bzero(mhp, sizeof(*mhp));
8136
8137 mhp->msg = mtod(m, struct sadb_msg *);
8138 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */
8139
8140 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
8141 extlen = end; /*just in case extlen is not updated*/
8142 for (off = sizeof(struct sadb_msg); off < end; off += extlen) {
8143 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff);
8144 if (!n) {
8145 /* m is already freed */
8146 return ENOBUFS;
8147 }
8148 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
8149
8150 /* set pointer */
8151 switch (ext->sadb_ext_type) {
8152 case SADB_EXT_SA:
8153 case SADB_EXT_ADDRESS_SRC:
8154 case SADB_EXT_ADDRESS_DST:
8155 case SADB_EXT_ADDRESS_PROXY:
8156 case SADB_EXT_LIFETIME_CURRENT:
8157 case SADB_EXT_LIFETIME_HARD:
8158 case SADB_EXT_LIFETIME_SOFT:
8159 case SADB_EXT_KEY_AUTH:
8160 case SADB_EXT_KEY_ENCRYPT:
8161 case SADB_EXT_IDENTITY_SRC:
8162 case SADB_EXT_IDENTITY_DST:
8163 case SADB_EXT_SENSITIVITY:
8164 case SADB_EXT_PROPOSAL:
8165 case SADB_EXT_SUPPORTED_AUTH:
8166 case SADB_EXT_SUPPORTED_ENCRYPT:
8167 case SADB_EXT_SPIRANGE:
8168 case SADB_X_EXT_POLICY:
8169 case SADB_X_EXT_SA2:
8170 case SADB_X_EXT_NAT_T_TYPE:
8171 case SADB_X_EXT_NAT_T_SPORT:
8172 case SADB_X_EXT_NAT_T_DPORT:
8173 case SADB_X_EXT_NAT_T_OAI:
8174 case SADB_X_EXT_NAT_T_OAR:
8175 case SADB_X_EXT_NAT_T_FRAG:
8176 case SADB_X_EXT_SA_REPLAY:
8177 case SADB_X_EXT_NEW_ADDRESS_SRC:
8178 case SADB_X_EXT_NEW_ADDRESS_DST:
8179 /* duplicate check */
8180 /*
8181 * XXX Are there duplication payloads of either
8182 * KEY_AUTH or KEY_ENCRYPT ?
8183 */
8184 if (mhp->ext[ext->sadb_ext_type] != NULL) {
8185 ipseclog((LOG_DEBUG, "%s: duplicate ext_type "
8186 "%u\n", __func__, ext->sadb_ext_type));
8187 m_freem(m);
8188 PFKEYSTAT_INC(out_dupext);
8189 return EINVAL;
8190 }
8191 break;
8192 default:
8193 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n",
8194 __func__, ext->sadb_ext_type));
8195 m_freem(m);
8196 PFKEYSTAT_INC(out_invexttype);
8197 return EINVAL;
8198 }
8199
8200 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
8201
8202 if (key_validate_ext(ext, extlen)) {
8203 m_freem(m);
8204 PFKEYSTAT_INC(out_invlen);
8205 return EINVAL;
8206 }
8207
8208 n = m_pulldown(m, off, extlen, &toff);
8209 if (!n) {
8210 /* m is already freed */
8211 return ENOBUFS;
8212 }
8213 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
8214
8215 mhp->ext[ext->sadb_ext_type] = ext;
8216 mhp->extoff[ext->sadb_ext_type] = off;
8217 mhp->extlen[ext->sadb_ext_type] = extlen;
8218 }
8219
8220 if (off != end) {
8221 m_freem(m);
8222 PFKEYSTAT_INC(out_invlen);
8223 return EINVAL;
8224 }
8225
8226 return 0;
8227 }
8228
8229 static int
key_validate_ext(const struct sadb_ext * ext,int len)8230 key_validate_ext(const struct sadb_ext *ext, int len)
8231 {
8232 const struct sockaddr *sa;
8233 enum { NONE, ADDR } checktype = NONE;
8234 int baselen = 0;
8235 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len);
8236
8237 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len))
8238 return EINVAL;
8239
8240 /* if it does not match minimum/maximum length, bail */
8241 if (ext->sadb_ext_type >= nitems(minsize) ||
8242 ext->sadb_ext_type >= nitems(maxsize))
8243 return EINVAL;
8244 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type])
8245 return EINVAL;
8246 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type])
8247 return EINVAL;
8248
8249 /* more checks based on sadb_ext_type XXX need more */
8250 switch (ext->sadb_ext_type) {
8251 case SADB_EXT_ADDRESS_SRC:
8252 case SADB_EXT_ADDRESS_DST:
8253 case SADB_EXT_ADDRESS_PROXY:
8254 case SADB_X_EXT_NAT_T_OAI:
8255 case SADB_X_EXT_NAT_T_OAR:
8256 case SADB_X_EXT_NEW_ADDRESS_SRC:
8257 case SADB_X_EXT_NEW_ADDRESS_DST:
8258 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
8259 checktype = ADDR;
8260 break;
8261 case SADB_EXT_IDENTITY_SRC:
8262 case SADB_EXT_IDENTITY_DST:
8263 if (((const struct sadb_ident *)ext)->sadb_ident_type ==
8264 SADB_X_IDENTTYPE_ADDR) {
8265 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident));
8266 checktype = ADDR;
8267 } else
8268 checktype = NONE;
8269 break;
8270 default:
8271 checktype = NONE;
8272 break;
8273 }
8274
8275 switch (checktype) {
8276 case NONE:
8277 break;
8278 case ADDR:
8279 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen);
8280 if (len < baselen + sal)
8281 return EINVAL;
8282 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len)
8283 return EINVAL;
8284 break;
8285 }
8286
8287 return 0;
8288 }
8289
8290 void
spdcache_init(void)8291 spdcache_init(void)
8292 {
8293 int i;
8294
8295 TUNABLE_INT_FETCH("net.key.spdcache.maxentries",
8296 &V_key_spdcache_maxentries);
8297 TUNABLE_INT_FETCH("net.key.spdcache.threshold",
8298 &V_key_spdcache_threshold);
8299
8300 if (V_key_spdcache_maxentries) {
8301 V_key_spdcache_maxentries = MAX(V_key_spdcache_maxentries,
8302 SPDCACHE_MAX_ENTRIES_PER_HASH);
8303 V_spdcachehashtbl = hashinit(V_key_spdcache_maxentries /
8304 SPDCACHE_MAX_ENTRIES_PER_HASH,
8305 M_IPSEC_SPDCACHE, &V_spdcachehash_mask);
8306 V_key_spdcache_maxentries = (V_spdcachehash_mask + 1)
8307 * SPDCACHE_MAX_ENTRIES_PER_HASH;
8308
8309 V_spdcache_lock = malloc(sizeof(struct mtx) *
8310 (V_spdcachehash_mask + 1),
8311 M_IPSEC_SPDCACHE, M_WAITOK | M_ZERO);
8312
8313 for (i = 0; i < V_spdcachehash_mask + 1; ++i)
8314 SPDCACHE_LOCK_INIT(i);
8315 }
8316 }
8317
8318 struct spdcache_entry *
spdcache_entry_alloc(const struct secpolicyindex * spidx,struct secpolicy * sp)8319 spdcache_entry_alloc(const struct secpolicyindex *spidx, struct secpolicy *sp)
8320 {
8321 struct spdcache_entry *entry;
8322
8323 entry = malloc(sizeof(struct spdcache_entry), M_IPSEC_SPDCACHE,
8324 M_NOWAIT | M_ZERO);
8325 if (entry == NULL)
8326 return (NULL);
8327
8328 if (sp != NULL)
8329 SP_ADDREF(sp);
8330
8331 entry->spidx = *spidx;
8332 entry->sp = sp;
8333
8334 return (entry);
8335 }
8336
8337 void
spdcache_entry_free(struct spdcache_entry * entry)8338 spdcache_entry_free(struct spdcache_entry *entry)
8339 {
8340
8341 if (entry->sp != NULL)
8342 key_freesp(&entry->sp);
8343 free(entry, M_IPSEC_SPDCACHE);
8344 }
8345
8346 void
spdcache_clear(void)8347 spdcache_clear(void)
8348 {
8349 struct spdcache_entry *entry;
8350 int i;
8351
8352 for (i = 0; i < V_spdcachehash_mask + 1; ++i) {
8353 SPDCACHE_LOCK(i);
8354 while (!LIST_EMPTY(&V_spdcachehashtbl[i])) {
8355 entry = LIST_FIRST(&V_spdcachehashtbl[i]);
8356 LIST_REMOVE(entry, chain);
8357 spdcache_entry_free(entry);
8358 }
8359 SPDCACHE_UNLOCK(i);
8360 }
8361 }
8362
8363 #ifdef VIMAGE
8364 void
spdcache_destroy(void)8365 spdcache_destroy(void)
8366 {
8367 int i;
8368
8369 if (SPDCACHE_ENABLED()) {
8370 spdcache_clear();
8371 hashdestroy(V_spdcachehashtbl, M_IPSEC_SPDCACHE, V_spdcachehash_mask);
8372
8373 for (i = 0; i < V_spdcachehash_mask + 1; ++i)
8374 SPDCACHE_LOCK_DESTROY(i);
8375
8376 free(V_spdcache_lock, M_IPSEC_SPDCACHE);
8377 }
8378 }
8379 #endif
8380
8381 static void
key_vnet_init(void * arg __unused)8382 key_vnet_init(void *arg __unused)
8383 {
8384 int i;
8385
8386 for (i = 0; i < IPSEC_DIR_MAX; i++) {
8387 TAILQ_INIT(&V_sptree[i]);
8388 TAILQ_INIT(&V_sptree_ifnet[i]);
8389 }
8390
8391 TAILQ_INIT(&V_sahtree);
8392 V_sphashtbl = hashinit(SPHASH_NHASH, M_IPSEC_SP, &V_sphash_mask);
8393 V_savhashtbl = hashinit(SAVHASH_NHASH, M_IPSEC_SA, &V_savhash_mask);
8394 V_sahaddrhashtbl = hashinit(SAHHASH_NHASH, M_IPSEC_SAH,
8395 &V_sahaddrhash_mask);
8396 V_acqaddrhashtbl = hashinit(ACQHASH_NHASH, M_IPSEC_SAQ,
8397 &V_acqaddrhash_mask);
8398 V_acqseqhashtbl = hashinit(ACQHASH_NHASH, M_IPSEC_SAQ,
8399 &V_acqseqhash_mask);
8400
8401 spdcache_init();
8402
8403 for (i = 0; i <= SADB_SATYPE_MAX; i++)
8404 LIST_INIT(&V_regtree[i]);
8405
8406 LIST_INIT(&V_acqtree);
8407 LIST_INIT(&V_spacqtree);
8408 }
8409 VNET_SYSINIT(key_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_SECOND,
8410 key_vnet_init, NULL);
8411
8412 static void
key_init(void * arg __unused)8413 key_init(void *arg __unused)
8414 {
8415
8416 ipsec_key_lft_zone = uma_zcreate("IPsec SA lft_c",
8417 sizeof(uint64_t) * 2, NULL, NULL, NULL, NULL,
8418 UMA_ALIGN_PTR, UMA_ZONE_PCPU);
8419
8420 SPTREE_LOCK_INIT();
8421 REGTREE_LOCK_INIT();
8422 SAHTREE_LOCK_INIT();
8423 ACQ_LOCK_INIT();
8424 SPACQ_LOCK_INIT();
8425 SPI_ALLOC_LOCK_INIT();
8426
8427 #ifndef IPSEC_DEBUG2
8428 callout_init(&key_timer, 1);
8429 callout_reset(&key_timer, hz, key_timehandler, NULL);
8430 #endif /*IPSEC_DEBUG2*/
8431
8432 /* initialize key statistics */
8433 keystat.getspi_count = 1;
8434
8435 if (bootverbose)
8436 printf("IPsec: Initialized Security Association Processing.\n");
8437 }
8438 SYSINIT(key_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, key_init, NULL);
8439
8440 #ifdef VIMAGE
8441 static void
key_vnet_destroy(void * arg __unused)8442 key_vnet_destroy(void *arg __unused)
8443 {
8444 struct secashead_queue sahdrainq;
8445 struct secpolicy_queue drainq;
8446 struct secpolicy *sp, *nextsp;
8447 struct secacq *acq, *nextacq;
8448 struct secspacq *spacq, *nextspacq;
8449 struct secashead *sah;
8450 struct secasvar *sav;
8451 struct secreg *reg;
8452 int i;
8453
8454 /*
8455 * XXX: can we just call free() for each object without
8456 * walking through safe way with releasing references?
8457 */
8458 TAILQ_INIT(&drainq);
8459 SPTREE_WLOCK();
8460 for (i = 0; i < IPSEC_DIR_MAX; i++) {
8461 TAILQ_CONCAT(&drainq, &V_sptree[i], chain);
8462 TAILQ_CONCAT(&drainq, &V_sptree_ifnet[i], chain);
8463 }
8464 for (i = 0; i < V_sphash_mask + 1; i++)
8465 LIST_INIT(&V_sphashtbl[i]);
8466 SPTREE_WUNLOCK();
8467 spdcache_destroy();
8468
8469 sp = TAILQ_FIRST(&drainq);
8470 while (sp != NULL) {
8471 nextsp = TAILQ_NEXT(sp, chain);
8472 key_freesp(&sp);
8473 sp = nextsp;
8474 }
8475
8476 TAILQ_INIT(&sahdrainq);
8477 SAHTREE_WLOCK();
8478 TAILQ_CONCAT(&sahdrainq, &V_sahtree, chain);
8479 for (i = 0; i < V_savhash_mask + 1; i++)
8480 LIST_INIT(&V_savhashtbl[i]);
8481 for (i = 0; i < V_sahaddrhash_mask + 1; i++)
8482 LIST_INIT(&V_sahaddrhashtbl[i]);
8483 TAILQ_FOREACH(sah, &sahdrainq, chain) {
8484 sah->state = SADB_SASTATE_DEAD;
8485 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
8486 sav->state = SADB_SASTATE_DEAD;
8487 }
8488 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
8489 sav->state = SADB_SASTATE_DEAD;
8490 }
8491 }
8492 SAHTREE_WUNLOCK();
8493
8494 key_freesah_flushed(&sahdrainq);
8495 hashdestroy(V_sphashtbl, M_IPSEC_SP, V_sphash_mask);
8496 hashdestroy(V_savhashtbl, M_IPSEC_SA, V_savhash_mask);
8497 hashdestroy(V_sahaddrhashtbl, M_IPSEC_SAH, V_sahaddrhash_mask);
8498
8499 REGTREE_LOCK();
8500 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
8501 LIST_FOREACH(reg, &V_regtree[i], chain) {
8502 if (__LIST_CHAINED(reg)) {
8503 LIST_REMOVE(reg, chain);
8504 free(reg, M_IPSEC_SAR);
8505 break;
8506 }
8507 }
8508 }
8509 REGTREE_UNLOCK();
8510
8511 ACQ_LOCK();
8512 acq = LIST_FIRST(&V_acqtree);
8513 while (acq != NULL) {
8514 nextacq = LIST_NEXT(acq, chain);
8515 LIST_REMOVE(acq, chain);
8516 free(acq, M_IPSEC_SAQ);
8517 acq = nextacq;
8518 }
8519 for (i = 0; i < V_acqaddrhash_mask + 1; i++)
8520 LIST_INIT(&V_acqaddrhashtbl[i]);
8521 for (i = 0; i < V_acqseqhash_mask + 1; i++)
8522 LIST_INIT(&V_acqseqhashtbl[i]);
8523 ACQ_UNLOCK();
8524
8525 SPACQ_LOCK();
8526 for (spacq = LIST_FIRST(&V_spacqtree); spacq != NULL;
8527 spacq = nextspacq) {
8528 nextspacq = LIST_NEXT(spacq, chain);
8529 if (__LIST_CHAINED(spacq)) {
8530 LIST_REMOVE(spacq, chain);
8531 free(spacq, M_IPSEC_SAQ);
8532 }
8533 }
8534 SPACQ_UNLOCK();
8535 hashdestroy(V_acqaddrhashtbl, M_IPSEC_SAQ, V_acqaddrhash_mask);
8536 hashdestroy(V_acqseqhashtbl, M_IPSEC_SAQ, V_acqseqhash_mask);
8537 }
8538 VNET_SYSUNINIT(key_vnet_destroy, SI_SUB_PROTO_DOMAIN, SI_ORDER_SECOND,
8539 key_vnet_destroy, NULL);
8540 #endif
8541
8542 /*
8543 * XXX: as long as domains are not unloadable, this function is never called,
8544 * provided for consistensy and future unload support.
8545 */
8546 static void
key_destroy(void * arg __unused)8547 key_destroy(void *arg __unused)
8548 {
8549 uma_zdestroy(ipsec_key_lft_zone);
8550
8551 #ifndef IPSEC_DEBUG2
8552 callout_drain(&key_timer);
8553 #endif
8554 SPTREE_LOCK_DESTROY();
8555 REGTREE_LOCK_DESTROY();
8556 SAHTREE_LOCK_DESTROY();
8557 ACQ_LOCK_DESTROY();
8558 SPACQ_LOCK_DESTROY();
8559 SPI_ALLOC_LOCK_DESTROY();
8560 }
8561 SYSUNINIT(key_destroy, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, key_destroy, NULL);
8562
8563 /* record data transfer on SA, and update timestamps */
8564 void
key_sa_recordxfer(struct secasvar * sav,struct mbuf * m)8565 key_sa_recordxfer(struct secasvar *sav, struct mbuf *m)
8566 {
8567 IPSEC_ASSERT(sav != NULL, ("Null secasvar"));
8568 IPSEC_ASSERT(m != NULL, ("Null mbuf"));
8569
8570 /*
8571 * XXX Currently, there is a difference of bytes size
8572 * between inbound and outbound processing.
8573 */
8574 counter_u64_add(sav->lft_c_bytes, m->m_pkthdr.len);
8575
8576 /*
8577 * We use the number of packets as the unit of
8578 * allocations. We increment the variable
8579 * whenever {esp,ah}_{in,out}put is called.
8580 */
8581 counter_u64_add(sav->lft_c_allocations, 1);
8582
8583 /*
8584 * NOTE: We record CURRENT usetime by using wall clock,
8585 * in seconds. HARD and SOFT lifetime are measured by the time
8586 * difference (again in seconds) from usetime.
8587 *
8588 * usetime
8589 * v expire expire
8590 * -----+-----+--------+---> t
8591 * <--------------> HARD
8592 * <-----> SOFT
8593 */
8594 if (sav->firstused == 0)
8595 sav->firstused = time_second;
8596 }
8597
8598 /*
8599 * Take one of the kernel's security keys and convert it into a PF_KEY
8600 * structure within an mbuf, suitable for sending up to a waiting
8601 * application in user land.
8602 *
8603 * IN:
8604 * src: A pointer to a kernel security key.
8605 * exttype: Which type of key this is. Refer to the PF_KEY data structures.
8606 * OUT:
8607 * a valid mbuf or NULL indicating an error
8608 *
8609 */
8610
8611 static struct mbuf *
key_setkey(struct seckey * src,uint16_t exttype)8612 key_setkey(struct seckey *src, uint16_t exttype)
8613 {
8614 struct mbuf *m;
8615 struct sadb_key *p;
8616 int len;
8617
8618 if (src == NULL)
8619 return NULL;
8620
8621 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src));
8622 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
8623 if (m == NULL)
8624 return NULL;
8625 m_align(m, len);
8626 m->m_len = len;
8627 p = mtod(m, struct sadb_key *);
8628 bzero(p, len);
8629 p->sadb_key_len = PFKEY_UNIT64(len);
8630 p->sadb_key_exttype = exttype;
8631 p->sadb_key_bits = src->bits;
8632 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src));
8633
8634 return m;
8635 }
8636
8637 /*
8638 * Take one of the kernel's lifetime data structures and convert it
8639 * into a PF_KEY structure within an mbuf, suitable for sending up to
8640 * a waiting application in user land.
8641 *
8642 * IN:
8643 * src: A pointer to a kernel lifetime structure.
8644 * exttype: Which type of lifetime this is. Refer to the PF_KEY
8645 * data structures for more information.
8646 * OUT:
8647 * a valid mbuf or NULL indicating an error
8648 *
8649 */
8650
8651 static struct mbuf *
key_setlifetime(struct seclifetime * src,uint16_t exttype)8652 key_setlifetime(struct seclifetime *src, uint16_t exttype)
8653 {
8654 struct mbuf *m = NULL;
8655 struct sadb_lifetime *p;
8656 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime));
8657
8658 if (src == NULL)
8659 return NULL;
8660
8661 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
8662 if (m == NULL)
8663 return m;
8664 m_align(m, len);
8665 m->m_len = len;
8666 p = mtod(m, struct sadb_lifetime *);
8667
8668 bzero(p, len);
8669 p->sadb_lifetime_len = PFKEY_UNIT64(len);
8670 p->sadb_lifetime_exttype = exttype;
8671 p->sadb_lifetime_allocations = src->allocations;
8672 p->sadb_lifetime_bytes = src->bytes;
8673 p->sadb_lifetime_addtime = src->addtime;
8674 p->sadb_lifetime_usetime = src->usetime;
8675
8676 return m;
8677
8678 }
8679
8680 const struct enc_xform *
enc_algorithm_lookup(int alg)8681 enc_algorithm_lookup(int alg)
8682 {
8683 int i;
8684
8685 for (i = 0; i < nitems(supported_ealgs); i++)
8686 if (alg == supported_ealgs[i].sadb_alg)
8687 return (supported_ealgs[i].xform);
8688 return (NULL);
8689 }
8690
8691 const struct auth_hash *
auth_algorithm_lookup(int alg)8692 auth_algorithm_lookup(int alg)
8693 {
8694 int i;
8695
8696 for (i = 0; i < nitems(supported_aalgs); i++)
8697 if (alg == supported_aalgs[i].sadb_alg)
8698 return (supported_aalgs[i].xform);
8699 return (NULL);
8700 }
8701
8702 const struct comp_algo *
comp_algorithm_lookup(int alg)8703 comp_algorithm_lookup(int alg)
8704 {
8705 int i;
8706
8707 for (i = 0; i < nitems(supported_calgs); i++)
8708 if (alg == supported_calgs[i].sadb_alg)
8709 return (supported_calgs[i].xform);
8710 return (NULL);
8711 }
8712