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 *,
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, result, 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 if (key0->sadb_key_bits == 0 || (sizeof(struct sadb_key) +
3441 (key0->sadb_key_bits >> 3)) > len)
3442 error = EINVAL;
3443 break;
3444 case SADB_X_SATYPE_IPCOMP:
3445 default:
3446 error = EINVAL;
3447 break;
3448 }
3449 if (error) {
3450 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n",
3451 __func__));
3452 goto fail;
3453 }
3454
3455 sav->key_auth = key_dup_keymsg(key0, M_IPSEC_MISC);
3456 if (sav->key_auth == NULL ) {
3457 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3458 __func__));
3459 PFKEYSTAT_INC(in_nomem);
3460 error = ENOBUFS;
3461 goto fail;
3462 }
3463 }
3464
3465 /* Encryption key */
3466 if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT)) {
3467 if (SADB_CHECKLEN(mhp, SADB_EXT_KEY_ENCRYPT)) {
3468 error = EINVAL;
3469 goto fail;
3470 }
3471 error = 0;
3472 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT];
3473 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT];
3474 switch (mhp->msg->sadb_msg_satype) {
3475 case SADB_SATYPE_ESP:
3476 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
3477 sav->alg_enc != SADB_EALG_NULL) {
3478 error = EINVAL;
3479 break;
3480 }
3481 if (key0->sadb_key_bits == 0 || (sizeof(struct sadb_key) +
3482 (key0->sadb_key_bits >> 3)) > len) {
3483 error = EINVAL;
3484 break;
3485 }
3486 sav->key_enc = key_dup_keymsg(key0, M_IPSEC_MISC);
3487 if (sav->key_enc == NULL) {
3488 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3489 __func__));
3490 PFKEYSTAT_INC(in_nomem);
3491 error = ENOBUFS;
3492 goto fail;
3493 }
3494 break;
3495 case SADB_X_SATYPE_IPCOMP:
3496 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key)))
3497 error = EINVAL;
3498 sav->key_enc = NULL; /*just in case*/
3499 break;
3500 case SADB_SATYPE_AH:
3501 case SADB_X_SATYPE_TCPSIGNATURE:
3502 default:
3503 error = EINVAL;
3504 break;
3505 }
3506 if (error) {
3507 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n",
3508 __func__));
3509 goto fail;
3510 }
3511 }
3512
3513 /* set iv */
3514 sav->ivlen = 0;
3515 switch (mhp->msg->sadb_msg_satype) {
3516 case SADB_SATYPE_AH:
3517 if (sav->flags & SADB_X_EXT_DERIV) {
3518 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
3519 "given to AH SA.\n", __func__));
3520 error = EINVAL;
3521 goto fail;
3522 }
3523 if (sav->alg_enc != SADB_EALG_NONE) {
3524 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3525 "mismated.\n", __func__));
3526 error = EINVAL;
3527 goto fail;
3528 }
3529 error = xform_init(sav, XF_AH);
3530 break;
3531 case SADB_SATYPE_ESP:
3532 if ((sav->flags & (SADB_X_EXT_OLD | SADB_X_EXT_DERIV)) ==
3533 (SADB_X_EXT_OLD | SADB_X_EXT_DERIV)) {
3534 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
3535 "given to old-esp.\n", __func__));
3536 error = EINVAL;
3537 goto fail;
3538 }
3539 error = xform_init(sav, XF_ESP);
3540 break;
3541 case SADB_X_SATYPE_IPCOMP:
3542 if (sav->alg_auth != SADB_AALG_NONE) {
3543 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3544 "mismated.\n", __func__));
3545 error = EINVAL;
3546 goto fail;
3547 }
3548 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 &&
3549 ntohl(sav->spi) >= 0x10000) {
3550 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n",
3551 __func__));
3552 error = EINVAL;
3553 goto fail;
3554 }
3555 error = xform_init(sav, XF_IPCOMP);
3556 break;
3557 case SADB_X_SATYPE_TCPSIGNATURE:
3558 if (sav->alg_enc != SADB_EALG_NONE) {
3559 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3560 "mismated.\n", __func__));
3561 error = EINVAL;
3562 goto fail;
3563 }
3564 error = xform_init(sav, XF_TCPSIGNATURE);
3565 break;
3566 default:
3567 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__));
3568 error = EPROTONOSUPPORT;
3569 goto fail;
3570 }
3571 if (error) {
3572 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n",
3573 __func__, mhp->msg->sadb_msg_satype));
3574 goto fail;
3575 }
3576
3577 /* Handle NAT-T headers */
3578 error = key_setnatt(sav, mhp);
3579 if (error != 0)
3580 goto fail;
3581
3582 /* Initialize lifetime for CURRENT */
3583 sav->firstused = 0;
3584 sav->created = time_second;
3585
3586 /* lifetimes for HARD and SOFT */
3587 error = key_updatelifetimes(sav, mhp);
3588 if (error == 0)
3589 return (0);
3590 fail:
3591 key_cleansav(sav);
3592 return (error);
3593 }
3594
3595 /*
3596 * subroutine for SADB_GET and SADB_DUMP.
3597 */
3598 static struct mbuf *
key_setdumpsa(struct secasvar * sav,uint8_t type,uint8_t satype,uint32_t seq,uint32_t pid)3599 key_setdumpsa(struct secasvar *sav, uint8_t type, uint8_t satype,
3600 uint32_t seq, uint32_t pid)
3601 {
3602 struct seclifetime lft_c;
3603 struct mbuf *result = NULL, *tres = NULL, *m;
3604 int i, dumporder[] = {
3605 SADB_EXT_SA, SADB_X_EXT_SA2, SADB_X_EXT_SA_REPLAY,
3606 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
3607 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC,
3608 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY,
3609 SADB_EXT_KEY_AUTH, SADB_EXT_KEY_ENCRYPT,
3610 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST,
3611 SADB_EXT_SENSITIVITY,
3612 SADB_X_EXT_NAT_T_TYPE,
3613 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT,
3614 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR,
3615 SADB_X_EXT_NAT_T_FRAG,
3616 };
3617 uint32_t replay_count;
3618
3619 SECASVAR_RLOCK_TRACKER;
3620
3621 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt);
3622 if (m == NULL)
3623 goto fail;
3624 result = m;
3625
3626 for (i = nitems(dumporder) - 1; i >= 0; i--) {
3627 m = NULL;
3628 switch (dumporder[i]) {
3629 case SADB_EXT_SA:
3630 m = key_setsadbsa(sav);
3631 if (!m)
3632 goto fail;
3633 break;
3634
3635 case SADB_X_EXT_SA2: {
3636 SECASVAR_RLOCK(sav);
3637 replay_count = sav->replay ? sav->replay->count : 0;
3638 SECASVAR_RUNLOCK(sav);
3639 m = key_setsadbxsa2(sav->sah->saidx.mode, replay_count,
3640 sav->sah->saidx.reqid);
3641 if (!m)
3642 goto fail;
3643 break;
3644 }
3645 case SADB_X_EXT_SA_REPLAY:
3646 if (sav->replay == NULL ||
3647 sav->replay->wsize <= UINT8_MAX)
3648 continue;
3649
3650 m = key_setsadbxsareplay(sav->replay->wsize);
3651 if (!m)
3652 goto fail;
3653 break;
3654
3655 case SADB_EXT_ADDRESS_SRC:
3656 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
3657 &sav->sah->saidx.src.sa,
3658 FULLMASK, IPSEC_ULPROTO_ANY);
3659 if (!m)
3660 goto fail;
3661 break;
3662
3663 case SADB_EXT_ADDRESS_DST:
3664 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
3665 &sav->sah->saidx.dst.sa,
3666 FULLMASK, IPSEC_ULPROTO_ANY);
3667 if (!m)
3668 goto fail;
3669 break;
3670
3671 case SADB_EXT_KEY_AUTH:
3672 if (!sav->key_auth)
3673 continue;
3674 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH);
3675 if (!m)
3676 goto fail;
3677 break;
3678
3679 case SADB_EXT_KEY_ENCRYPT:
3680 if (!sav->key_enc)
3681 continue;
3682 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT);
3683 if (!m)
3684 goto fail;
3685 break;
3686
3687 case SADB_EXT_LIFETIME_CURRENT:
3688 lft_c.addtime = sav->created;
3689 lft_c.allocations = (uint32_t)counter_u64_fetch(
3690 sav->lft_c_allocations);
3691 lft_c.bytes = counter_u64_fetch(sav->lft_c_bytes);
3692 lft_c.usetime = sav->firstused;
3693 m = key_setlifetime(&lft_c, SADB_EXT_LIFETIME_CURRENT);
3694 if (!m)
3695 goto fail;
3696 break;
3697
3698 case SADB_EXT_LIFETIME_HARD:
3699 if (!sav->lft_h)
3700 continue;
3701 m = key_setlifetime(sav->lft_h,
3702 SADB_EXT_LIFETIME_HARD);
3703 if (!m)
3704 goto fail;
3705 break;
3706
3707 case SADB_EXT_LIFETIME_SOFT:
3708 if (!sav->lft_s)
3709 continue;
3710 m = key_setlifetime(sav->lft_s,
3711 SADB_EXT_LIFETIME_SOFT);
3712
3713 if (!m)
3714 goto fail;
3715 break;
3716
3717 case SADB_X_EXT_NAT_T_TYPE:
3718 if (sav->natt == NULL)
3719 continue;
3720 m = key_setsadbxtype(UDP_ENCAP_ESPINUDP);
3721 if (!m)
3722 goto fail;
3723 break;
3724
3725 case SADB_X_EXT_NAT_T_DPORT:
3726 if (sav->natt == NULL)
3727 continue;
3728 m = key_setsadbxport(sav->natt->dport,
3729 SADB_X_EXT_NAT_T_DPORT);
3730 if (!m)
3731 goto fail;
3732 break;
3733
3734 case SADB_X_EXT_NAT_T_SPORT:
3735 if (sav->natt == NULL)
3736 continue;
3737 m = key_setsadbxport(sav->natt->sport,
3738 SADB_X_EXT_NAT_T_SPORT);
3739 if (!m)
3740 goto fail;
3741 break;
3742
3743 case SADB_X_EXT_NAT_T_OAI:
3744 if (sav->natt == NULL ||
3745 (sav->natt->flags & IPSEC_NATT_F_OAI) == 0)
3746 continue;
3747 m = key_setsadbaddr(SADB_X_EXT_NAT_T_OAI,
3748 &sav->natt->oai.sa, FULLMASK, IPSEC_ULPROTO_ANY);
3749 if (!m)
3750 goto fail;
3751 break;
3752 case SADB_X_EXT_NAT_T_OAR:
3753 if (sav->natt == NULL ||
3754 (sav->natt->flags & IPSEC_NATT_F_OAR) == 0)
3755 continue;
3756 m = key_setsadbaddr(SADB_X_EXT_NAT_T_OAR,
3757 &sav->natt->oar.sa, FULLMASK, IPSEC_ULPROTO_ANY);
3758 if (!m)
3759 goto fail;
3760 break;
3761 case SADB_X_EXT_NAT_T_FRAG:
3762 /* We do not (yet) support those. */
3763 continue;
3764
3765 case SADB_EXT_ADDRESS_PROXY:
3766 case SADB_EXT_IDENTITY_SRC:
3767 case SADB_EXT_IDENTITY_DST:
3768 /* XXX: should we brought from SPD ? */
3769 case SADB_EXT_SENSITIVITY:
3770 default:
3771 continue;
3772 }
3773
3774 if (!m)
3775 goto fail;
3776 if (tres)
3777 m_cat(m, tres);
3778 tres = m;
3779 }
3780
3781 m_cat(result, tres);
3782 tres = NULL;
3783 if (result->m_len < sizeof(struct sadb_msg)) {
3784 result = m_pullup(result, sizeof(struct sadb_msg));
3785 if (result == NULL)
3786 goto fail;
3787 }
3788
3789 result->m_pkthdr.len = 0;
3790 for (m = result; m; m = m->m_next)
3791 result->m_pkthdr.len += m->m_len;
3792
3793 mtod(result, struct sadb_msg *)->sadb_msg_len =
3794 PFKEY_UNIT64(result->m_pkthdr.len);
3795
3796 return result;
3797
3798 fail:
3799 m_freem(result);
3800 m_freem(tres);
3801 return NULL;
3802 }
3803
3804 /*
3805 * set data into sadb_msg.
3806 */
3807 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)3808 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq,
3809 pid_t pid, u_int16_t reserved)
3810 {
3811 struct mbuf *m;
3812 struct sadb_msg *p;
3813 int len;
3814
3815 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
3816 if (len > MCLBYTES)
3817 return NULL;
3818 m = key_mget(len);
3819 if (m == NULL)
3820 return NULL;
3821 m->m_pkthdr.len = m->m_len = len;
3822 m->m_next = NULL;
3823
3824 p = mtod(m, struct sadb_msg *);
3825
3826 bzero(p, len);
3827 p->sadb_msg_version = PF_KEY_V2;
3828 p->sadb_msg_type = type;
3829 p->sadb_msg_errno = 0;
3830 p->sadb_msg_satype = satype;
3831 p->sadb_msg_len = PFKEY_UNIT64(tlen);
3832 p->sadb_msg_reserved = reserved;
3833 p->sadb_msg_seq = seq;
3834 p->sadb_msg_pid = (u_int32_t)pid;
3835
3836 return m;
3837 }
3838
3839 /*
3840 * copy secasvar data into sadb_address.
3841 */
3842 static struct mbuf *
key_setsadbsa(struct secasvar * sav)3843 key_setsadbsa(struct secasvar *sav)
3844 {
3845 struct mbuf *m;
3846 struct sadb_sa *p;
3847 int len;
3848
3849 len = PFKEY_ALIGN8(sizeof(struct sadb_sa));
3850 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3851 if (m == NULL)
3852 return (NULL);
3853 m_align(m, len);
3854 m->m_len = len;
3855 p = mtod(m, struct sadb_sa *);
3856 bzero(p, len);
3857 p->sadb_sa_len = PFKEY_UNIT64(len);
3858 p->sadb_sa_exttype = SADB_EXT_SA;
3859 p->sadb_sa_spi = sav->spi;
3860 p->sadb_sa_replay = sav->replay ?
3861 (sav->replay->wsize > UINT8_MAX ? UINT8_MAX :
3862 sav->replay->wsize): 0;
3863 p->sadb_sa_state = sav->state;
3864 p->sadb_sa_auth = sav->alg_auth;
3865 p->sadb_sa_encrypt = sav->alg_enc;
3866 p->sadb_sa_flags = sav->flags & SADB_KEY_FLAGS_MAX;
3867 return (m);
3868 }
3869
3870 /*
3871 * set data into sadb_address.
3872 */
3873 static struct mbuf *
key_setsadbaddr(u_int16_t exttype,const struct sockaddr * saddr,u_int8_t prefixlen,u_int16_t ul_proto)3874 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr,
3875 u_int8_t prefixlen, u_int16_t ul_proto)
3876 {
3877 struct mbuf *m;
3878 struct sadb_address *p;
3879 size_t len;
3880
3881 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) +
3882 PFKEY_ALIGN8(saddr->sa_len);
3883 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3884 if (m == NULL)
3885 return (NULL);
3886 m_align(m, len);
3887 m->m_len = len;
3888 p = mtod(m, struct sadb_address *);
3889
3890 bzero(p, len);
3891 p->sadb_address_len = PFKEY_UNIT64(len);
3892 p->sadb_address_exttype = exttype;
3893 p->sadb_address_proto = ul_proto;
3894 if (prefixlen == FULLMASK) {
3895 switch (saddr->sa_family) {
3896 case AF_INET:
3897 prefixlen = sizeof(struct in_addr) << 3;
3898 break;
3899 case AF_INET6:
3900 prefixlen = sizeof(struct in6_addr) << 3;
3901 break;
3902 default:
3903 ; /*XXX*/
3904 }
3905 }
3906 p->sadb_address_prefixlen = prefixlen;
3907 p->sadb_address_reserved = 0;
3908
3909 bcopy(saddr,
3910 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)),
3911 saddr->sa_len);
3912
3913 return m;
3914 }
3915
3916 /*
3917 * set data into sadb_x_sa2.
3918 */
3919 static struct mbuf *
key_setsadbxsa2(u_int8_t mode,u_int32_t seq,u_int32_t reqid)3920 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid)
3921 {
3922 struct mbuf *m;
3923 struct sadb_x_sa2 *p;
3924 size_t len;
3925
3926 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2));
3927 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3928 if (m == NULL)
3929 return (NULL);
3930 m_align(m, len);
3931 m->m_len = len;
3932 p = mtod(m, struct sadb_x_sa2 *);
3933
3934 bzero(p, len);
3935 p->sadb_x_sa2_len = PFKEY_UNIT64(len);
3936 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
3937 p->sadb_x_sa2_mode = mode;
3938 p->sadb_x_sa2_reserved1 = 0;
3939 p->sadb_x_sa2_reserved2 = 0;
3940 p->sadb_x_sa2_sequence = seq;
3941 p->sadb_x_sa2_reqid = reqid;
3942
3943 return m;
3944 }
3945
3946 /*
3947 * Set data into sadb_x_sa_replay.
3948 */
3949 static struct mbuf *
key_setsadbxsareplay(u_int32_t replay)3950 key_setsadbxsareplay(u_int32_t replay)
3951 {
3952 struct mbuf *m;
3953 struct sadb_x_sa_replay *p;
3954 size_t len;
3955
3956 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa_replay));
3957 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3958 if (m == NULL)
3959 return (NULL);
3960 m_align(m, len);
3961 m->m_len = len;
3962 p = mtod(m, struct sadb_x_sa_replay *);
3963
3964 bzero(p, len);
3965 p->sadb_x_sa_replay_len = PFKEY_UNIT64(len);
3966 p->sadb_x_sa_replay_exttype = SADB_X_EXT_SA_REPLAY;
3967 p->sadb_x_sa_replay_replay = (replay << 3);
3968
3969 return m;
3970 }
3971
3972 /*
3973 * Set a type in sadb_x_nat_t_type.
3974 */
3975 static struct mbuf *
key_setsadbxtype(u_int16_t type)3976 key_setsadbxtype(u_int16_t type)
3977 {
3978 struct mbuf *m;
3979 size_t len;
3980 struct sadb_x_nat_t_type *p;
3981
3982 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type));
3983
3984 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3985 if (m == NULL)
3986 return (NULL);
3987 m_align(m, len);
3988 m->m_len = len;
3989 p = mtod(m, struct sadb_x_nat_t_type *);
3990
3991 bzero(p, len);
3992 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len);
3993 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
3994 p->sadb_x_nat_t_type_type = type;
3995
3996 return (m);
3997 }
3998 /*
3999 * Set a port in sadb_x_nat_t_port.
4000 * In contrast to default RFC 2367 behaviour, port is in network byte order.
4001 */
4002 static struct mbuf *
key_setsadbxport(u_int16_t port,u_int16_t type)4003 key_setsadbxport(u_int16_t port, u_int16_t type)
4004 {
4005 struct mbuf *m;
4006 size_t len;
4007 struct sadb_x_nat_t_port *p;
4008
4009 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port));
4010
4011 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
4012 if (m == NULL)
4013 return (NULL);
4014 m_align(m, len);
4015 m->m_len = len;
4016 p = mtod(m, struct sadb_x_nat_t_port *);
4017
4018 bzero(p, len);
4019 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len);
4020 p->sadb_x_nat_t_port_exttype = type;
4021 p->sadb_x_nat_t_port_port = port;
4022
4023 return (m);
4024 }
4025
4026 /*
4027 * Get port from sockaddr. Port is in network byte order.
4028 */
4029 uint16_t
key_portfromsaddr(struct sockaddr * sa)4030 key_portfromsaddr(struct sockaddr *sa)
4031 {
4032
4033 switch (sa->sa_family) {
4034 #ifdef INET
4035 case AF_INET:
4036 return ((struct sockaddr_in *)sa)->sin_port;
4037 #endif
4038 #ifdef INET6
4039 case AF_INET6:
4040 return ((struct sockaddr_in6 *)sa)->sin6_port;
4041 #endif
4042 }
4043 return (0);
4044 }
4045
4046 /*
4047 * Set port in struct sockaddr. Port is in network byte order.
4048 */
4049 void
key_porttosaddr(struct sockaddr * sa,uint16_t port)4050 key_porttosaddr(struct sockaddr *sa, uint16_t port)
4051 {
4052
4053 switch (sa->sa_family) {
4054 #ifdef INET
4055 case AF_INET:
4056 ((struct sockaddr_in *)sa)->sin_port = port;
4057 break;
4058 #endif
4059 #ifdef INET6
4060 case AF_INET6:
4061 ((struct sockaddr_in6 *)sa)->sin6_port = port;
4062 break;
4063 #endif
4064 default:
4065 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n",
4066 __func__, sa->sa_family));
4067 break;
4068 }
4069 }
4070
4071 /*
4072 * set data into sadb_x_policy
4073 */
4074 static struct mbuf *
key_setsadbxpolicy(u_int16_t type,u_int8_t dir,u_int32_t id,u_int32_t priority)4075 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id, u_int32_t priority)
4076 {
4077 struct mbuf *m;
4078 struct sadb_x_policy *p;
4079 size_t len;
4080
4081 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy));
4082 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
4083 if (m == NULL)
4084 return (NULL);
4085 m_align(m, len);
4086 m->m_len = len;
4087 p = mtod(m, struct sadb_x_policy *);
4088
4089 bzero(p, len);
4090 p->sadb_x_policy_len = PFKEY_UNIT64(len);
4091 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
4092 p->sadb_x_policy_type = type;
4093 p->sadb_x_policy_dir = dir;
4094 p->sadb_x_policy_id = id;
4095 p->sadb_x_policy_priority = priority;
4096
4097 return m;
4098 }
4099
4100 /* %%% utilities */
4101 /* Take a key message (sadb_key) from the socket and turn it into one
4102 * of the kernel's key structures (seckey).
4103 *
4104 * IN: pointer to the src
4105 * OUT: NULL no more memory
4106 */
4107 struct seckey *
key_dup_keymsg(const struct sadb_key * src,struct malloc_type * type)4108 key_dup_keymsg(const struct sadb_key *src, struct malloc_type *type)
4109 {
4110 struct seckey *dst;
4111 size_t len;
4112
4113 dst = malloc(sizeof(*dst), type, M_NOWAIT);
4114 if (dst != NULL) {
4115 len = src->sadb_key_bits >> 3;
4116 dst->bits = src->sadb_key_bits;
4117 dst->key_data = malloc(len, type, M_NOWAIT);
4118 if (dst->key_data != NULL) {
4119 bcopy((const char *)(src + 1), dst->key_data, len);
4120 } else {
4121 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
4122 __func__));
4123 free(dst, type);
4124 dst = NULL;
4125 }
4126 } else {
4127 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
4128 __func__));
4129 }
4130 return (dst);
4131 }
4132
4133 /* Take a lifetime message (sadb_lifetime) passed in on a socket and
4134 * turn it into one of the kernel's lifetime structures (seclifetime).
4135 *
4136 * IN: pointer to the destination, source and malloc type
4137 * OUT: NULL, no more memory
4138 */
4139
4140 static struct seclifetime *
key_dup_lifemsg(const struct sadb_lifetime * src,struct malloc_type * type)4141 key_dup_lifemsg(const struct sadb_lifetime *src, struct malloc_type *type)
4142 {
4143 struct seclifetime *dst;
4144
4145 dst = malloc(sizeof(*dst), type, M_NOWAIT);
4146 if (dst == NULL) {
4147 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
4148 return (NULL);
4149 }
4150 dst->allocations = src->sadb_lifetime_allocations;
4151 dst->bytes = src->sadb_lifetime_bytes;
4152 dst->addtime = src->sadb_lifetime_addtime;
4153 dst->usetime = src->sadb_lifetime_usetime;
4154 return (dst);
4155 }
4156
4157 /*
4158 * compare two secasindex structure.
4159 * flag can specify to compare 2 saidxes.
4160 * compare two secasindex structure without both mode and reqid.
4161 * don't compare port.
4162 * IN:
4163 * saidx0: source, it can be in SAD.
4164 * saidx1: object.
4165 * OUT:
4166 * 1 : equal
4167 * 0 : not equal
4168 */
4169 static int
key_cmpsaidx(const struct secasindex * saidx0,const struct secasindex * saidx1,int flag)4170 key_cmpsaidx(const struct secasindex *saidx0, const struct secasindex *saidx1,
4171 int flag)
4172 {
4173
4174 /* sanity */
4175 if (saidx0 == NULL && saidx1 == NULL)
4176 return 1;
4177
4178 if (saidx0 == NULL || saidx1 == NULL)
4179 return 0;
4180
4181 if (saidx0->proto != saidx1->proto)
4182 return 0;
4183
4184 if (flag == CMP_EXACTLY) {
4185 if (saidx0->mode != saidx1->mode)
4186 return 0;
4187 if (saidx0->reqid != saidx1->reqid)
4188 return 0;
4189 if (bcmp(&saidx0->src, &saidx1->src,
4190 saidx0->src.sa.sa_len) != 0 ||
4191 bcmp(&saidx0->dst, &saidx1->dst,
4192 saidx0->dst.sa.sa_len) != 0)
4193 return 0;
4194 } else {
4195 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */
4196 if (flag == CMP_MODE_REQID || flag == CMP_REQID) {
4197 /*
4198 * If reqid of SPD is non-zero, unique SA is required.
4199 * The result must be of same reqid in this case.
4200 */
4201 if (saidx1->reqid != 0 &&
4202 saidx0->reqid != saidx1->reqid)
4203 return 0;
4204 }
4205
4206 if (flag == CMP_MODE_REQID) {
4207 if (saidx0->mode != IPSEC_MODE_ANY
4208 && saidx0->mode != saidx1->mode)
4209 return 0;
4210 }
4211
4212 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0)
4213 return 0;
4214 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0)
4215 return 0;
4216 }
4217
4218 return 1;
4219 }
4220
4221 /*
4222 * compare two secindex structure exactly.
4223 * IN:
4224 * spidx0: source, it is often in SPD.
4225 * spidx1: object, it is often from PFKEY message.
4226 * OUT:
4227 * 1 : equal
4228 * 0 : not equal
4229 */
4230 static int
key_cmpspidx_exactly(struct secpolicyindex * spidx0,struct secpolicyindex * spidx1)4231 key_cmpspidx_exactly(struct secpolicyindex *spidx0,
4232 struct secpolicyindex *spidx1)
4233 {
4234 /* sanity */
4235 if (spidx0 == NULL && spidx1 == NULL)
4236 return 1;
4237
4238 if (spidx0 == NULL || spidx1 == NULL)
4239 return 0;
4240
4241 if (spidx0->prefs != spidx1->prefs
4242 || spidx0->prefd != spidx1->prefd
4243 || spidx0->ul_proto != spidx1->ul_proto
4244 || spidx0->dir != spidx1->dir)
4245 return 0;
4246
4247 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 &&
4248 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0;
4249 }
4250
4251 /*
4252 * compare two secindex structure with mask.
4253 * IN:
4254 * spidx0: source, it is often in SPD.
4255 * spidx1: object, it is often from IP header.
4256 * OUT:
4257 * 1 : equal
4258 * 0 : not equal
4259 */
4260 static int
key_cmpspidx_withmask(struct secpolicyindex * spidx0,struct secpolicyindex * spidx1)4261 key_cmpspidx_withmask(struct secpolicyindex *spidx0,
4262 struct secpolicyindex *spidx1)
4263 {
4264 /* sanity */
4265 if (spidx0 == NULL && spidx1 == NULL)
4266 return 1;
4267
4268 if (spidx0 == NULL || spidx1 == NULL)
4269 return 0;
4270
4271 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family ||
4272 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family ||
4273 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len ||
4274 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len)
4275 return 0;
4276
4277 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */
4278 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY
4279 && spidx0->ul_proto != spidx1->ul_proto)
4280 return 0;
4281
4282 switch (spidx0->src.sa.sa_family) {
4283 case AF_INET:
4284 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY
4285 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port)
4286 return 0;
4287 if (!key_bbcmp(&spidx0->src.sin.sin_addr,
4288 &spidx1->src.sin.sin_addr, spidx0->prefs))
4289 return 0;
4290 break;
4291 case AF_INET6:
4292 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY
4293 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port)
4294 return 0;
4295 /*
4296 * scope_id check. if sin6_scope_id is 0, we regard it
4297 * as a wildcard scope, which matches any scope zone ID.
4298 */
4299 if (spidx0->src.sin6.sin6_scope_id &&
4300 spidx1->src.sin6.sin6_scope_id &&
4301 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id)
4302 return 0;
4303 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr,
4304 &spidx1->src.sin6.sin6_addr, spidx0->prefs))
4305 return 0;
4306 break;
4307 default:
4308 /* XXX */
4309 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0)
4310 return 0;
4311 break;
4312 }
4313
4314 switch (spidx0->dst.sa.sa_family) {
4315 case AF_INET:
4316 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY
4317 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port)
4318 return 0;
4319 if (!key_bbcmp(&spidx0->dst.sin.sin_addr,
4320 &spidx1->dst.sin.sin_addr, spidx0->prefd))
4321 return 0;
4322 break;
4323 case AF_INET6:
4324 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY
4325 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port)
4326 return 0;
4327 /*
4328 * scope_id check. if sin6_scope_id is 0, we regard it
4329 * as a wildcard scope, which matches any scope zone ID.
4330 */
4331 if (spidx0->dst.sin6.sin6_scope_id &&
4332 spidx1->dst.sin6.sin6_scope_id &&
4333 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id)
4334 return 0;
4335 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr,
4336 &spidx1->dst.sin6.sin6_addr, spidx0->prefd))
4337 return 0;
4338 break;
4339 default:
4340 /* XXX */
4341 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0)
4342 return 0;
4343 break;
4344 }
4345
4346 /* XXX Do we check other field ? e.g. flowinfo */
4347
4348 return 1;
4349 }
4350
4351 #ifdef satosin
4352 #undef satosin
4353 #endif
4354 #define satosin(s) ((const struct sockaddr_in *)s)
4355 #ifdef satosin6
4356 #undef satosin6
4357 #endif
4358 #define satosin6(s) ((const struct sockaddr_in6 *)s)
4359 /* returns 0 on match */
4360 int
key_sockaddrcmp(const struct sockaddr * sa1,const struct sockaddr * sa2,int port)4361 key_sockaddrcmp(const struct sockaddr *sa1, const struct sockaddr *sa2,
4362 int port)
4363 {
4364 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
4365 return 1;
4366
4367 switch (sa1->sa_family) {
4368 #ifdef INET
4369 case AF_INET:
4370 if (sa1->sa_len != sizeof(struct sockaddr_in))
4371 return 1;
4372 if (satosin(sa1)->sin_addr.s_addr !=
4373 satosin(sa2)->sin_addr.s_addr) {
4374 return 1;
4375 }
4376 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port)
4377 return 1;
4378 break;
4379 #endif
4380 #ifdef INET6
4381 case AF_INET6:
4382 if (sa1->sa_len != sizeof(struct sockaddr_in6))
4383 return 1; /*EINVAL*/
4384 if (satosin6(sa1)->sin6_scope_id !=
4385 satosin6(sa2)->sin6_scope_id) {
4386 return 1;
4387 }
4388 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr,
4389 &satosin6(sa2)->sin6_addr)) {
4390 return 1;
4391 }
4392 if (port &&
4393 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) {
4394 return 1;
4395 }
4396 break;
4397 #endif
4398 default:
4399 if (bcmp(sa1, sa2, sa1->sa_len) != 0)
4400 return 1;
4401 break;
4402 }
4403
4404 return 0;
4405 }
4406
4407 /* returns 0 on match */
4408 int
key_sockaddrcmp_withmask(const struct sockaddr * sa1,const struct sockaddr * sa2,size_t mask)4409 key_sockaddrcmp_withmask(const struct sockaddr *sa1,
4410 const struct sockaddr *sa2, size_t mask)
4411 {
4412 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
4413 return (1);
4414
4415 switch (sa1->sa_family) {
4416 #ifdef INET
4417 case AF_INET:
4418 return (!key_bbcmp(&satosin(sa1)->sin_addr,
4419 &satosin(sa2)->sin_addr, mask));
4420 #endif
4421 #ifdef INET6
4422 case AF_INET6:
4423 if (satosin6(sa1)->sin6_scope_id !=
4424 satosin6(sa2)->sin6_scope_id)
4425 return (1);
4426 return (!key_bbcmp(&satosin6(sa1)->sin6_addr,
4427 &satosin6(sa2)->sin6_addr, mask));
4428 #endif
4429 }
4430 return (1);
4431 }
4432 #undef satosin
4433 #undef satosin6
4434
4435 /*
4436 * compare two buffers with mask.
4437 * IN:
4438 * addr1: source
4439 * addr2: object
4440 * bits: Number of bits to compare
4441 * OUT:
4442 * 1 : equal
4443 * 0 : not equal
4444 */
4445 static int
key_bbcmp(const void * a1,const void * a2,u_int bits)4446 key_bbcmp(const void *a1, const void *a2, u_int bits)
4447 {
4448 const unsigned char *p1 = a1;
4449 const unsigned char *p2 = a2;
4450
4451 /* XXX: This could be considerably faster if we compare a word
4452 * at a time, but it is complicated on LSB Endian machines */
4453
4454 /* Handle null pointers */
4455 if (p1 == NULL || p2 == NULL)
4456 return (p1 == p2);
4457
4458 while (bits >= 8) {
4459 if (*p1++ != *p2++)
4460 return 0;
4461 bits -= 8;
4462 }
4463
4464 if (bits > 0) {
4465 u_int8_t mask = ~((1<<(8-bits))-1);
4466 if ((*p1 & mask) != (*p2 & mask))
4467 return 0;
4468 }
4469 return 1; /* Match! */
4470 }
4471
4472 static void
key_flush_spd(time_t now)4473 key_flush_spd(time_t now)
4474 {
4475 SPTREE_RLOCK_TRACKER;
4476 struct secpolicy_list drainq;
4477 struct secpolicy *sp, *nextsp;
4478 u_int dir;
4479
4480 LIST_INIT(&drainq);
4481 SPTREE_RLOCK();
4482 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
4483 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
4484 if (sp->lifetime == 0 && sp->validtime == 0)
4485 continue;
4486 if ((sp->lifetime &&
4487 now - sp->created > sp->lifetime) ||
4488 (sp->validtime &&
4489 now - sp->lastused > sp->validtime)) {
4490 /* Hold extra reference to send SPDEXPIRE */
4491 SP_ADDREF(sp);
4492 LIST_INSERT_HEAD(&drainq, sp, drainq);
4493 }
4494 }
4495 }
4496 SPTREE_RUNLOCK();
4497 if (LIST_EMPTY(&drainq))
4498 return;
4499
4500 SPTREE_WLOCK();
4501 sp = LIST_FIRST(&drainq);
4502 while (sp != NULL) {
4503 nextsp = LIST_NEXT(sp, drainq);
4504 /* Check that SP is still linked */
4505 if (sp->state != IPSEC_SPSTATE_ALIVE) {
4506 LIST_REMOVE(sp, drainq);
4507 key_freesp(&sp); /* release extra reference */
4508 sp = nextsp;
4509 continue;
4510 }
4511 TAILQ_REMOVE(&V_sptree[sp->spidx.dir], sp, chain);
4512 V_spd_size--;
4513 LIST_REMOVE(sp, idhash);
4514 sp->state = IPSEC_SPSTATE_DEAD;
4515 sp = nextsp;
4516 }
4517 V_sp_genid++;
4518 SPTREE_WUNLOCK();
4519 if (SPDCACHE_ENABLED())
4520 spdcache_clear();
4521
4522 sp = LIST_FIRST(&drainq);
4523 while (sp != NULL) {
4524 nextsp = LIST_NEXT(sp, drainq);
4525 key_spdexpire(sp);
4526 key_freesp(&sp); /* release extra reference */
4527 key_freesp(&sp); /* release last reference */
4528 sp = nextsp;
4529 }
4530 }
4531
4532 static void
key_flush_sad(time_t now)4533 key_flush_sad(time_t now)
4534 {
4535 SAHTREE_RLOCK_TRACKER;
4536 struct secashead_list emptyq;
4537 struct secasvar_list drainq, hexpireq, sexpireq, freeq;
4538 struct secashead *sah, *nextsah;
4539 struct secasvar *sav, *nextsav;
4540
4541 SECASVAR_RLOCK_TRACKER;
4542
4543 LIST_INIT(&drainq);
4544 LIST_INIT(&hexpireq);
4545 LIST_INIT(&sexpireq);
4546 LIST_INIT(&emptyq);
4547
4548 SAHTREE_RLOCK();
4549 TAILQ_FOREACH(sah, &V_sahtree, chain) {
4550 /* Check for empty SAH */
4551 if (TAILQ_EMPTY(&sah->savtree_larval) &&
4552 TAILQ_EMPTY(&sah->savtree_alive)) {
4553 SAH_ADDREF(sah);
4554 LIST_INSERT_HEAD(&emptyq, sah, drainq);
4555 continue;
4556 }
4557 /* Add all stale LARVAL SAs into drainq */
4558 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
4559 if (now - sav->created < V_key_larval_lifetime)
4560 continue;
4561 SAV_ADDREF(sav);
4562 LIST_INSERT_HEAD(&drainq, sav, drainq);
4563 }
4564 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
4565 /* lifetimes aren't specified */
4566 if (sav->lft_h == NULL)
4567 continue;
4568 SECASVAR_RLOCK(sav);
4569 /*
4570 * Check again with lock held, because it may
4571 * be updated by SADB_UPDATE.
4572 */
4573 if (sav->lft_h == NULL) {
4574 SECASVAR_RUNLOCK(sav);
4575 continue;
4576 }
4577 /*
4578 * RFC 2367:
4579 * HARD lifetimes MUST take precedence over SOFT
4580 * lifetimes, meaning if the HARD and SOFT lifetimes
4581 * are the same, the HARD lifetime will appear on the
4582 * EXPIRE message.
4583 */
4584 /* check HARD lifetime */
4585 if ((sav->lft_h->addtime != 0 &&
4586 now - sav->created > sav->lft_h->addtime) ||
4587 (sav->lft_h->usetime != 0 && sav->firstused &&
4588 now - sav->firstused > sav->lft_h->usetime) ||
4589 (sav->lft_h->bytes != 0 && counter_u64_fetch(
4590 sav->lft_c_bytes) > sav->lft_h->bytes)) {
4591 SECASVAR_RUNLOCK(sav);
4592 SAV_ADDREF(sav);
4593 LIST_INSERT_HEAD(&hexpireq, sav, drainq);
4594 continue;
4595 }
4596 /* check SOFT lifetime (only for MATURE SAs) */
4597 if (sav->state == SADB_SASTATE_MATURE && (
4598 (sav->lft_s->addtime != 0 &&
4599 now - sav->created > sav->lft_s->addtime) ||
4600 (sav->lft_s->usetime != 0 && sav->firstused &&
4601 now - sav->firstused > sav->lft_s->usetime) ||
4602 (sav->lft_s->bytes != 0 && counter_u64_fetch(
4603 sav->lft_c_bytes) > sav->lft_s->bytes) ||
4604 (!(sav->flags & SADB_X_SAFLAGS_ESN) &&
4605 (sav->replay != NULL) && (
4606 (sav->replay->count > UINT32_80PCT) ||
4607 (sav->replay->last > UINT32_80PCT))))) {
4608 SECASVAR_RUNLOCK(sav);
4609 SAV_ADDREF(sav);
4610 LIST_INSERT_HEAD(&sexpireq, sav, drainq);
4611 continue;
4612 }
4613 SECASVAR_RUNLOCK(sav);
4614 }
4615 }
4616 SAHTREE_RUNLOCK();
4617
4618 if (LIST_EMPTY(&emptyq) && LIST_EMPTY(&drainq) &&
4619 LIST_EMPTY(&hexpireq) && LIST_EMPTY(&sexpireq))
4620 return;
4621
4622 LIST_INIT(&freeq);
4623 SAHTREE_WLOCK();
4624 /* Unlink stale LARVAL SAs */
4625 sav = LIST_FIRST(&drainq);
4626 while (sav != NULL) {
4627 nextsav = LIST_NEXT(sav, drainq);
4628 /* Check that SA is still LARVAL */
4629 if (sav->state != SADB_SASTATE_LARVAL) {
4630 LIST_REMOVE(sav, drainq);
4631 LIST_INSERT_HEAD(&freeq, sav, drainq);
4632 sav = nextsav;
4633 continue;
4634 }
4635 TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
4636 LIST_REMOVE(sav, spihash);
4637 sav->state = SADB_SASTATE_DEAD;
4638 sav = nextsav;
4639 }
4640 /* Unlink all SAs with expired HARD lifetime */
4641 sav = LIST_FIRST(&hexpireq);
4642 while (sav != NULL) {
4643 nextsav = LIST_NEXT(sav, drainq);
4644 /* Check that SA is not unlinked */
4645 if (sav->state == SADB_SASTATE_DEAD) {
4646 LIST_REMOVE(sav, drainq);
4647 LIST_INSERT_HEAD(&freeq, sav, drainq);
4648 sav = nextsav;
4649 continue;
4650 }
4651 TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
4652 LIST_REMOVE(sav, spihash);
4653 sav->state = SADB_SASTATE_DEAD;
4654 sav = nextsav;
4655 }
4656 /* Mark all SAs with expired SOFT lifetime as DYING */
4657 sav = LIST_FIRST(&sexpireq);
4658 while (sav != NULL) {
4659 nextsav = LIST_NEXT(sav, drainq);
4660 /* Check that SA is not unlinked */
4661 if (sav->state == SADB_SASTATE_DEAD) {
4662 LIST_REMOVE(sav, drainq);
4663 LIST_INSERT_HEAD(&freeq, sav, drainq);
4664 sav = nextsav;
4665 continue;
4666 }
4667 /*
4668 * NOTE: this doesn't change SA order in the chain.
4669 */
4670 sav->state = SADB_SASTATE_DYING;
4671 sav = nextsav;
4672 }
4673 /* Unlink empty SAHs */
4674 sah = LIST_FIRST(&emptyq);
4675 while (sah != NULL) {
4676 nextsah = LIST_NEXT(sah, drainq);
4677 /* Check that SAH is still empty and not unlinked */
4678 if (sah->state == SADB_SASTATE_DEAD ||
4679 !TAILQ_EMPTY(&sah->savtree_larval) ||
4680 !TAILQ_EMPTY(&sah->savtree_alive)) {
4681 LIST_REMOVE(sah, drainq);
4682 key_freesah(&sah); /* release extra reference */
4683 sah = nextsah;
4684 continue;
4685 }
4686 TAILQ_REMOVE(&V_sahtree, sah, chain);
4687 LIST_REMOVE(sah, addrhash);
4688 sah->state = SADB_SASTATE_DEAD;
4689 sah = nextsah;
4690 }
4691 SAHTREE_WUNLOCK();
4692
4693 /* Send SPDEXPIRE messages */
4694 sav = LIST_FIRST(&hexpireq);
4695 while (sav != NULL) {
4696 nextsav = LIST_NEXT(sav, drainq);
4697 key_expire(sav, 1);
4698 key_freesah(&sav->sah); /* release reference from SAV */
4699 key_freesav(&sav); /* release extra reference */
4700 key_freesav(&sav); /* release last reference */
4701 sav = nextsav;
4702 }
4703 sav = LIST_FIRST(&sexpireq);
4704 while (sav != NULL) {
4705 nextsav = LIST_NEXT(sav, drainq);
4706 key_expire(sav, 0);
4707 key_freesav(&sav); /* release extra reference */
4708 sav = nextsav;
4709 }
4710 /* Free stale LARVAL SAs */
4711 sav = LIST_FIRST(&drainq);
4712 while (sav != NULL) {
4713 nextsav = LIST_NEXT(sav, drainq);
4714 key_freesah(&sav->sah); /* release reference from SAV */
4715 key_freesav(&sav); /* release extra reference */
4716 key_freesav(&sav); /* release last reference */
4717 sav = nextsav;
4718 }
4719 /* Free SAs that were unlinked/changed by someone else */
4720 sav = LIST_FIRST(&freeq);
4721 while (sav != NULL) {
4722 nextsav = LIST_NEXT(sav, drainq);
4723 key_freesav(&sav); /* release extra reference */
4724 sav = nextsav;
4725 }
4726 /* Free empty SAH */
4727 sah = LIST_FIRST(&emptyq);
4728 while (sah != NULL) {
4729 nextsah = LIST_NEXT(sah, drainq);
4730 key_freesah(&sah); /* release extra reference */
4731 key_freesah(&sah); /* release last reference */
4732 sah = nextsah;
4733 }
4734 }
4735
4736 static void
key_flush_acq(time_t now)4737 key_flush_acq(time_t now)
4738 {
4739 struct secacq *acq, *nextacq;
4740
4741 /* ACQ tree */
4742 ACQ_LOCK();
4743 acq = LIST_FIRST(&V_acqtree);
4744 while (acq != NULL) {
4745 nextacq = LIST_NEXT(acq, chain);
4746 if (now - acq->created > V_key_blockacq_lifetime) {
4747 LIST_REMOVE(acq, chain);
4748 LIST_REMOVE(acq, addrhash);
4749 LIST_REMOVE(acq, seqhash);
4750 free(acq, M_IPSEC_SAQ);
4751 }
4752 acq = nextacq;
4753 }
4754 ACQ_UNLOCK();
4755 }
4756
4757 static void
key_flush_spacq(time_t now)4758 key_flush_spacq(time_t now)
4759 {
4760 struct secspacq *acq, *nextacq;
4761
4762 /* SP ACQ tree */
4763 SPACQ_LOCK();
4764 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) {
4765 nextacq = LIST_NEXT(acq, chain);
4766 if (now - acq->created > V_key_blockacq_lifetime
4767 && __LIST_CHAINED(acq)) {
4768 LIST_REMOVE(acq, chain);
4769 free(acq, M_IPSEC_SAQ);
4770 }
4771 }
4772 SPACQ_UNLOCK();
4773 }
4774
4775 /*
4776 * time handler.
4777 * scanning SPD and SAD to check status for each entries,
4778 * and do to remove or to expire.
4779 * XXX: year 2038 problem may remain.
4780 */
4781 static void
key_timehandler(void * arg)4782 key_timehandler(void *arg)
4783 {
4784 VNET_ITERATOR_DECL(vnet_iter);
4785 time_t now = time_second;
4786
4787 VNET_LIST_RLOCK_NOSLEEP();
4788 VNET_FOREACH(vnet_iter) {
4789 CURVNET_SET(vnet_iter);
4790 key_flush_spd(now);
4791 key_flush_sad(now);
4792 key_flush_acq(now);
4793 key_flush_spacq(now);
4794 CURVNET_RESTORE();
4795 }
4796 VNET_LIST_RUNLOCK_NOSLEEP();
4797
4798 #ifndef IPSEC_DEBUG2
4799 /* do exchange to tick time !! */
4800 callout_schedule(&key_timer, hz);
4801 #endif /* IPSEC_DEBUG2 */
4802 }
4803
4804 u_long
key_random(void)4805 key_random(void)
4806 {
4807 u_long value;
4808
4809 arc4random_buf(&value, sizeof(value));
4810 return value;
4811 }
4812
4813 /*
4814 * map SADB_SATYPE_* to IPPROTO_*.
4815 * if satype == SADB_SATYPE then satype is mapped to ~0.
4816 * OUT:
4817 * 0: invalid satype.
4818 */
4819 static uint8_t
key_satype2proto(uint8_t satype)4820 key_satype2proto(uint8_t satype)
4821 {
4822 switch (satype) {
4823 case SADB_SATYPE_UNSPEC:
4824 return IPSEC_PROTO_ANY;
4825 case SADB_SATYPE_AH:
4826 return IPPROTO_AH;
4827 case SADB_SATYPE_ESP:
4828 return IPPROTO_ESP;
4829 case SADB_X_SATYPE_IPCOMP:
4830 return IPPROTO_IPCOMP;
4831 case SADB_X_SATYPE_TCPSIGNATURE:
4832 return IPPROTO_TCP;
4833 default:
4834 return 0;
4835 }
4836 /* NOTREACHED */
4837 }
4838
4839 /*
4840 * map IPPROTO_* to SADB_SATYPE_*
4841 * OUT:
4842 * 0: invalid protocol type.
4843 */
4844 static uint8_t
key_proto2satype(uint8_t proto)4845 key_proto2satype(uint8_t proto)
4846 {
4847 switch (proto) {
4848 case IPPROTO_AH:
4849 return SADB_SATYPE_AH;
4850 case IPPROTO_ESP:
4851 return SADB_SATYPE_ESP;
4852 case IPPROTO_IPCOMP:
4853 return SADB_X_SATYPE_IPCOMP;
4854 case IPPROTO_TCP:
4855 return SADB_X_SATYPE_TCPSIGNATURE;
4856 default:
4857 return 0;
4858 }
4859 /* NOTREACHED */
4860 }
4861
4862 /* %%% PF_KEY */
4863 /*
4864 * SADB_GETSPI processing is to receive
4865 * <base, (SA2), src address, dst address, (SPI range)>
4866 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND
4867 * tree with the status of LARVAL, and send
4868 * <base, SA(*), address(SD)>
4869 * to the IKMPd.
4870 *
4871 * IN: mhp: pointer to the pointer to each header.
4872 * OUT: NULL if fail.
4873 * other if success, return pointer to the message to send.
4874 */
4875 static int
key_getspi(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)4876 key_getspi(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4877 {
4878 struct secasindex saidx;
4879 struct sadb_address *src0, *dst0;
4880 struct secasvar *sav;
4881 uint32_t reqid, spi;
4882 int error;
4883 uint8_t mode, proto;
4884
4885 IPSEC_ASSERT(so != NULL, ("null socket"));
4886 IPSEC_ASSERT(m != NULL, ("null mbuf"));
4887 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
4888 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
4889
4890 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
4891 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST)
4892 #ifdef PFKEY_STRICT_CHECKS
4893 || SADB_CHECKHDR(mhp, SADB_EXT_SPIRANGE)
4894 #endif
4895 ) {
4896 ipseclog((LOG_DEBUG,
4897 "%s: invalid message: missing required header.\n",
4898 __func__));
4899 error = EINVAL;
4900 goto fail;
4901 }
4902 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
4903 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)
4904 #ifdef PFKEY_STRICT_CHECKS
4905 || SADB_CHECKLEN(mhp, SADB_EXT_SPIRANGE)
4906 #endif
4907 ) {
4908 ipseclog((LOG_DEBUG,
4909 "%s: invalid message: wrong header size.\n", __func__));
4910 error = EINVAL;
4911 goto fail;
4912 }
4913 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
4914 mode = IPSEC_MODE_ANY;
4915 reqid = 0;
4916 } else {
4917 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
4918 ipseclog((LOG_DEBUG,
4919 "%s: invalid message: wrong header size.\n",
4920 __func__));
4921 error = EINVAL;
4922 goto fail;
4923 }
4924 mode = ((struct sadb_x_sa2 *)
4925 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4926 reqid = ((struct sadb_x_sa2 *)
4927 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4928 }
4929
4930 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4931 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4932
4933 /* map satype to proto */
4934 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4935 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
4936 __func__));
4937 error = EINVAL;
4938 goto fail;
4939 }
4940 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
4941 (struct sockaddr *)(dst0 + 1));
4942 if (error != 0) {
4943 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
4944 error = EINVAL;
4945 goto fail;
4946 }
4947 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4948
4949 /* SPI allocation */
4950 SPI_ALLOC_LOCK();
4951 spi = key_do_getnewspi(
4952 (struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], &saidx);
4953 if (spi == 0) {
4954 /*
4955 * Requested SPI or SPI range is not available or
4956 * already used.
4957 */
4958 SPI_ALLOC_UNLOCK();
4959 error = EEXIST;
4960 goto fail;
4961 }
4962 sav = key_newsav(mhp, &saidx, spi, &error);
4963 SPI_ALLOC_UNLOCK();
4964 if (sav == NULL)
4965 goto fail;
4966
4967 if (sav->seq != 0) {
4968 /*
4969 * RFC2367:
4970 * If the SADB_GETSPI message is in response to a
4971 * kernel-generated SADB_ACQUIRE, the sadb_msg_seq
4972 * MUST be the same as the SADB_ACQUIRE message.
4973 *
4974 * XXXAE: However it doesn't definethe behaviour how to
4975 * check this and what to do if it doesn't match.
4976 * Also what we should do if it matches?
4977 *
4978 * We can compare saidx used in SADB_ACQUIRE with saidx
4979 * used in SADB_GETSPI, but this probably can break
4980 * existing software. For now just warn if it doesn't match.
4981 *
4982 * XXXAE: anyway it looks useless.
4983 */
4984 key_acqdone(&saidx, sav->seq);
4985 }
4986 KEYDBG(KEY_STAMP,
4987 printf("%s: SA(%p)\n", __func__, sav));
4988 KEYDBG(KEY_DATA, kdebug_secasv(sav));
4989
4990 {
4991 struct mbuf *n, *nn;
4992 struct sadb_sa *m_sa;
4993 struct sadb_msg *newmsg;
4994 int off, len;
4995
4996 /* create new sadb_msg to reply. */
4997 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) +
4998 PFKEY_ALIGN8(sizeof(struct sadb_sa));
4999
5000 n = key_mget(len);
5001 if (n == NULL) {
5002 error = ENOBUFS;
5003 goto fail;
5004 }
5005
5006 n->m_len = len;
5007 n->m_next = NULL;
5008 off = 0;
5009
5010 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
5011 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
5012
5013 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off);
5014 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa));
5015 m_sa->sadb_sa_exttype = SADB_EXT_SA;
5016 m_sa->sadb_sa_spi = spi; /* SPI is already in network byte order */
5017 off += PFKEY_ALIGN8(sizeof(struct sadb_sa));
5018
5019 IPSEC_ASSERT(off == len,
5020 ("length inconsistency (off %u len %u)", off, len));
5021
5022 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC,
5023 SADB_EXT_ADDRESS_DST);
5024 if (!n->m_next) {
5025 m_freem(n);
5026 error = ENOBUFS;
5027 goto fail;
5028 }
5029
5030 if (n->m_len < sizeof(struct sadb_msg)) {
5031 n = m_pullup(n, sizeof(struct sadb_msg));
5032 if (n == NULL)
5033 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
5034 }
5035
5036 n->m_pkthdr.len = 0;
5037 for (nn = n; nn; nn = nn->m_next)
5038 n->m_pkthdr.len += nn->m_len;
5039
5040 newmsg = mtod(n, struct sadb_msg *);
5041 newmsg->sadb_msg_seq = sav->seq;
5042 newmsg->sadb_msg_errno = 0;
5043 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
5044
5045 m_freem(m);
5046 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
5047 }
5048
5049 fail:
5050 return (key_senderror(so, m, error));
5051 }
5052
5053 /*
5054 * allocating new SPI
5055 * called by key_getspi().
5056 * OUT:
5057 * 0: failure.
5058 * others: success, SPI in network byte order.
5059 */
5060 static uint32_t
key_do_getnewspi(struct sadb_spirange * spirange,struct secasindex * saidx)5061 key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx)
5062 {
5063 uint32_t min, max, newspi, t;
5064 int tries, limit;
5065
5066 SPI_ALLOC_LOCK_ASSERT();
5067
5068 /* set spi range to allocate */
5069 if (spirange != NULL) {
5070 min = spirange->sadb_spirange_min;
5071 max = spirange->sadb_spirange_max;
5072 } else {
5073 min = V_key_spi_minval;
5074 max = V_key_spi_maxval;
5075 }
5076 /* IPCOMP needs 2-byte SPI */
5077 if (saidx->proto == IPPROTO_IPCOMP) {
5078 if (min >= 0x10000)
5079 min = 0xffff;
5080 if (max >= 0x10000)
5081 max = 0xffff;
5082 if (min > max) {
5083 t = min; min = max; max = t;
5084 }
5085 }
5086
5087 if (min == max) {
5088 if (key_checkspidup(htonl(min))) {
5089 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n",
5090 __func__, min));
5091 return 0;
5092 }
5093
5094 tries = 1;
5095 newspi = min;
5096 } else {
5097 /* init SPI */
5098 newspi = 0;
5099
5100 limit = atomic_load_int(&V_key_spi_trycnt);
5101 /* when requesting to allocate spi ranged */
5102 for (tries = 0; tries < limit; tries++) {
5103 /* generate pseudo-random SPI value ranged. */
5104 newspi = min + (key_random() % (max - min + 1));
5105 if (!key_checkspidup(htonl(newspi)))
5106 break;
5107 }
5108
5109 if (tries == limit || newspi == 0) {
5110 ipseclog((LOG_DEBUG,
5111 "%s: failed to allocate SPI.\n", __func__));
5112 return 0;
5113 }
5114 }
5115
5116 /* statistics */
5117 keystat.getspi_count =
5118 (keystat.getspi_count + tries) / 2;
5119
5120 return (htonl(newspi));
5121 }
5122
5123 /*
5124 * Find TCP-MD5 SA with corresponding secasindex.
5125 * If not found, return NULL and fill SPI with usable value if needed.
5126 */
5127 static struct secasvar *
key_getsav_tcpmd5(struct secasindex * saidx,uint32_t * spi)5128 key_getsav_tcpmd5(struct secasindex *saidx, uint32_t *spi)
5129 {
5130 SAHTREE_RLOCK_TRACKER;
5131 struct secashead *sah;
5132 struct secasvar *sav;
5133
5134 IPSEC_ASSERT(saidx->proto == IPPROTO_TCP, ("wrong proto"));
5135 SAHTREE_RLOCK();
5136 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
5137 if (sah->saidx.proto != IPPROTO_TCP)
5138 continue;
5139 if (!key_sockaddrcmp(&saidx->dst.sa, &sah->saidx.dst.sa, 0) &&
5140 !key_sockaddrcmp(&saidx->src.sa, &sah->saidx.src.sa, 0))
5141 break;
5142 }
5143 if (sah != NULL) {
5144 if (V_key_preferred_oldsa)
5145 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
5146 else
5147 sav = TAILQ_FIRST(&sah->savtree_alive);
5148 if (sav != NULL) {
5149 SAV_ADDREF(sav);
5150 SAHTREE_RUNLOCK();
5151 return (sav);
5152 }
5153 }
5154 if (spi == NULL) {
5155 /* No SPI required */
5156 SAHTREE_RUNLOCK();
5157 return (NULL);
5158 }
5159 /* Check that SPI is unique */
5160 LIST_FOREACH(sav, SAVHASH_HASH(*spi), spihash) {
5161 if (sav->spi == *spi)
5162 break;
5163 }
5164 if (sav == NULL) {
5165 SAHTREE_RUNLOCK();
5166 /* SPI is already unique */
5167 return (NULL);
5168 }
5169 SAHTREE_RUNLOCK();
5170 /* XXX: not optimal */
5171 *spi = key_do_getnewspi(NULL, saidx);
5172 return (NULL);
5173 }
5174
5175 static int
key_updateaddresses(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp,struct secasvar * sav,struct secasindex * saidx)5176 key_updateaddresses(struct socket *so, struct mbuf *m,
5177 const struct sadb_msghdr *mhp, struct secasvar *sav,
5178 struct secasindex *saidx)
5179 {
5180 struct sockaddr *newaddr;
5181 struct secashead *sah;
5182 struct secasvar *newsav, *tmp;
5183 struct mbuf *n;
5184 int error, isnew;
5185
5186 /* Check that we need to change SAH */
5187 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC)) {
5188 newaddr = (struct sockaddr *)(
5189 ((struct sadb_address *)
5190 mhp->ext[SADB_X_EXT_NEW_ADDRESS_SRC]) + 1);
5191 bcopy(newaddr, &saidx->src, newaddr->sa_len);
5192 key_porttosaddr(&saidx->src.sa, 0);
5193 }
5194 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST)) {
5195 newaddr = (struct sockaddr *)(
5196 ((struct sadb_address *)
5197 mhp->ext[SADB_X_EXT_NEW_ADDRESS_DST]) + 1);
5198 bcopy(newaddr, &saidx->dst, newaddr->sa_len);
5199 key_porttosaddr(&saidx->dst.sa, 0);
5200 }
5201 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC) ||
5202 !SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST)) {
5203 error = key_checksockaddrs(&saidx->src.sa, &saidx->dst.sa);
5204 if (error != 0) {
5205 ipseclog((LOG_DEBUG, "%s: invalid new sockaddr.\n",
5206 __func__));
5207 return (error);
5208 }
5209
5210 sah = key_getsah(saidx);
5211 if (sah == NULL) {
5212 /* create a new SA index */
5213 sah = key_newsah(saidx);
5214 if (sah == NULL) {
5215 ipseclog((LOG_DEBUG,
5216 "%s: No more memory.\n", __func__));
5217 return (ENOBUFS);
5218 }
5219 isnew = 2; /* SAH is new */
5220 } else
5221 isnew = 1; /* existing SAH is referenced */
5222 } else {
5223 /*
5224 * src and dst addresses are still the same.
5225 * Do we want to change NAT-T config?
5226 */
5227 if (sav->sah->saidx.proto != IPPROTO_ESP ||
5228 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5229 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_SPORT) ||
5230 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5231 ipseclog((LOG_DEBUG,
5232 "%s: invalid message: missing required header.\n",
5233 __func__));
5234 return (EINVAL);
5235 }
5236 /* We hold reference to SA, thus SAH will be referenced too. */
5237 sah = sav->sah;
5238 isnew = 0;
5239 }
5240
5241 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA,
5242 M_NOWAIT | M_ZERO);
5243 if (newsav == NULL) {
5244 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5245 error = ENOBUFS;
5246 goto fail;
5247 }
5248
5249 /* Clone SA's content into newsav */
5250 SAV_INITREF(newsav);
5251 bcopy(sav, newsav, offsetof(struct secasvar, chain));
5252 /*
5253 * We create new NAT-T config if it is needed.
5254 * Old NAT-T config will be freed by key_cleansav() when
5255 * last reference to SA will be released.
5256 */
5257 newsav->natt = NULL;
5258 newsav->sah = sah;
5259 newsav->state = SADB_SASTATE_MATURE;
5260 error = key_setnatt(newsav, mhp);
5261 if (error != 0)
5262 goto fail;
5263
5264 SAHTREE_WLOCK();
5265 /* Check that SA is still alive */
5266 if (sav->state == SADB_SASTATE_DEAD) {
5267 /* SA was unlinked */
5268 SAHTREE_WUNLOCK();
5269 error = ESRCH;
5270 goto fail;
5271 }
5272
5273 /* Unlink SA from SAH and SPI hash */
5274 IPSEC_ASSERT((sav->flags & SADB_X_EXT_F_CLONED) == 0,
5275 ("SA is already cloned"));
5276 IPSEC_ASSERT(sav->state == SADB_SASTATE_MATURE ||
5277 sav->state == SADB_SASTATE_DYING,
5278 ("Wrong SA state %u\n", sav->state));
5279 TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
5280 LIST_REMOVE(sav, spihash);
5281 sav->state = SADB_SASTATE_DEAD;
5282
5283 /*
5284 * Link new SA with SAH. Keep SAs ordered by
5285 * create time (newer are first).
5286 */
5287 TAILQ_FOREACH(tmp, &sah->savtree_alive, chain) {
5288 if (newsav->created > tmp->created) {
5289 TAILQ_INSERT_BEFORE(tmp, newsav, chain);
5290 break;
5291 }
5292 }
5293 if (tmp == NULL)
5294 TAILQ_INSERT_TAIL(&sah->savtree_alive, newsav, chain);
5295
5296 /* Add new SA into SPI hash. */
5297 LIST_INSERT_HEAD(SAVHASH_HASH(newsav->spi), newsav, spihash);
5298
5299 /* Add new SAH into SADB. */
5300 if (isnew == 2) {
5301 TAILQ_INSERT_HEAD(&V_sahtree, sah, chain);
5302 LIST_INSERT_HEAD(SAHADDRHASH_HASH(saidx), sah, addrhash);
5303 sah->state = SADB_SASTATE_MATURE;
5304 SAH_ADDREF(sah); /* newsav references new SAH */
5305 }
5306 /*
5307 * isnew == 1 -> @sah was referenced by key_getsah().
5308 * isnew == 0 -> we use the same @sah, that was used by @sav,
5309 * and we use its reference for @newsav.
5310 */
5311 SECASVAR_WLOCK(sav);
5312 /* XXX: replace cntr with pointer? */
5313 newsav->cntr = sav->cntr;
5314 sav->flags |= SADB_X_EXT_F_CLONED;
5315 SECASVAR_WUNLOCK(sav);
5316
5317 SAHTREE_WUNLOCK();
5318
5319 KEYDBG(KEY_STAMP,
5320 printf("%s: SA(%p) cloned into SA(%p)\n",
5321 __func__, sav, newsav));
5322 KEYDBG(KEY_DATA, kdebug_secasv(newsav));
5323
5324 key_freesav(&sav); /* release last reference */
5325
5326 /* set msg buf from mhp */
5327 n = key_getmsgbuf_x1(m, mhp);
5328 if (n == NULL) {
5329 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5330 return (ENOBUFS);
5331 }
5332 m_freem(m);
5333 key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5334 return (0);
5335 fail:
5336 if (isnew != 0)
5337 key_freesah(&sah);
5338 if (newsav != NULL) {
5339 if (newsav->natt != NULL)
5340 free(newsav->natt, M_IPSEC_MISC);
5341 free(newsav, M_IPSEC_SA);
5342 }
5343 return (error);
5344 }
5345
5346 /*
5347 * SADB_UPDATE processing
5348 * receive
5349 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5350 * key(AE), (identity(SD),) (sensitivity)>
5351 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL.
5352 * and send
5353 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5354 * (identity(SD),) (sensitivity)>
5355 * to the ikmpd.
5356 *
5357 * m will always be freed.
5358 */
5359 static int
key_update(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)5360 key_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5361 {
5362 struct secasindex saidx;
5363 struct sadb_address *src0, *dst0;
5364 struct sadb_sa *sa0;
5365 struct secasvar *sav;
5366 uint32_t reqid;
5367 int error;
5368 uint8_t mode, proto;
5369
5370 IPSEC_ASSERT(so != NULL, ("null socket"));
5371 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5372 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5373 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5374
5375 /* map satype to proto */
5376 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5377 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5378 __func__));
5379 return key_senderror(so, m, EINVAL);
5380 }
5381
5382 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
5383 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
5384 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
5385 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
5386 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
5387 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
5388 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
5389 ipseclog((LOG_DEBUG,
5390 "%s: invalid message: missing required header.\n",
5391 __func__));
5392 return key_senderror(so, m, EINVAL);
5393 }
5394 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
5395 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
5396 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
5397 ipseclog((LOG_DEBUG,
5398 "%s: invalid message: wrong header size.\n", __func__));
5399 return key_senderror(so, m, EINVAL);
5400 }
5401 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
5402 mode = IPSEC_MODE_ANY;
5403 reqid = 0;
5404 } else {
5405 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
5406 ipseclog((LOG_DEBUG,
5407 "%s: invalid message: wrong header size.\n",
5408 __func__));
5409 return key_senderror(so, m, EINVAL);
5410 }
5411 mode = ((struct sadb_x_sa2 *)
5412 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
5413 reqid = ((struct sadb_x_sa2 *)
5414 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
5415 }
5416
5417 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5418 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
5419 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
5420
5421 /*
5422 * Only SADB_SASTATE_MATURE SAs may be submitted in an
5423 * SADB_UPDATE message.
5424 */
5425 if (sa0->sadb_sa_state != SADB_SASTATE_MATURE) {
5426 ipseclog((LOG_DEBUG, "%s: invalid state.\n", __func__));
5427 #ifdef PFKEY_STRICT_CHECKS
5428 return key_senderror(so, m, EINVAL);
5429 #endif
5430 }
5431 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
5432 (struct sockaddr *)(dst0 + 1));
5433 if (error != 0) {
5434 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
5435 return key_senderror(so, m, error);
5436 }
5437 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
5438 sav = key_getsavbyspi(sa0->sadb_sa_spi);
5439 if (sav == NULL) {
5440 ipseclog((LOG_DEBUG, "%s: no SA found for SPI %u\n",
5441 __func__, ntohl(sa0->sadb_sa_spi)));
5442 return key_senderror(so, m, EINVAL);
5443 }
5444 /*
5445 * Check that SADB_UPDATE issued by the same process that did
5446 * SADB_GETSPI or SADB_ADD.
5447 */
5448 if (sav->pid != mhp->msg->sadb_msg_pid) {
5449 ipseclog((LOG_DEBUG,
5450 "%s: pid mismatched (SPI %u, pid %u vs. %u)\n", __func__,
5451 ntohl(sav->spi), sav->pid, mhp->msg->sadb_msg_pid));
5452 key_freesav(&sav);
5453 return key_senderror(so, m, EINVAL);
5454 }
5455 /* saidx should match with SA. */
5456 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_MODE_REQID) == 0) {
5457 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u\n",
5458 __func__, ntohl(sav->spi)));
5459 key_freesav(&sav);
5460 return key_senderror(so, m, ESRCH);
5461 }
5462
5463 if (sav->state == SADB_SASTATE_LARVAL) {
5464 if ((mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
5465 SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT)) ||
5466 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
5467 SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH))) {
5468 ipseclog((LOG_DEBUG,
5469 "%s: invalid message: missing required header.\n",
5470 __func__));
5471 key_freesav(&sav);
5472 return key_senderror(so, m, EINVAL);
5473 }
5474 /*
5475 * We can set any values except src, dst and SPI.
5476 */
5477 error = key_setsaval(sav, mhp);
5478 if (error != 0) {
5479 key_freesav(&sav);
5480 return (key_senderror(so, m, error));
5481 }
5482 /* Change SA state to MATURE */
5483 SAHTREE_WLOCK();
5484 if (sav->state != SADB_SASTATE_LARVAL) {
5485 /* SA was deleted or another thread made it MATURE. */
5486 SAHTREE_WUNLOCK();
5487 key_freesav(&sav);
5488 return (key_senderror(so, m, ESRCH));
5489 }
5490 /*
5491 * NOTE: we keep SAs in savtree_alive ordered by created
5492 * time. When SA's state changed from LARVAL to MATURE,
5493 * we update its created time in key_setsaval() and move
5494 * it into head of savtree_alive.
5495 */
5496 TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
5497 TAILQ_INSERT_HEAD(&sav->sah->savtree_alive, sav, chain);
5498 sav->state = SADB_SASTATE_MATURE;
5499 SAHTREE_WUNLOCK();
5500 } else {
5501 /*
5502 * For DYING and MATURE SA we can change only state
5503 * and lifetimes. Report EINVAL if something else attempted
5504 * to change.
5505 */
5506 if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT) ||
5507 !SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH)) {
5508 key_freesav(&sav);
5509 return (key_senderror(so, m, EINVAL));
5510 }
5511 error = key_updatelifetimes(sav, mhp);
5512 if (error != 0) {
5513 key_freesav(&sav);
5514 return (key_senderror(so, m, error));
5515 }
5516 /*
5517 * This is FreeBSD extension to RFC2367.
5518 * IKEd can specify SADB_X_EXT_NEW_ADDRESS_SRC and/or
5519 * SADB_X_EXT_NEW_ADDRESS_DST when it wants to change
5520 * SA addresses (for example to implement MOBIKE protocol
5521 * as described in RFC4555). Also we allow to change
5522 * NAT-T config.
5523 */
5524 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC) ||
5525 !SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST) ||
5526 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5527 sav->natt != NULL) {
5528 error = key_updateaddresses(so, m, mhp, sav, &saidx);
5529 key_freesav(&sav);
5530 if (error != 0)
5531 return (key_senderror(so, m, error));
5532 return (0);
5533 }
5534 /* Check that SA is still alive */
5535 SAHTREE_WLOCK();
5536 if (sav->state == SADB_SASTATE_DEAD) {
5537 /* SA was unlinked */
5538 SAHTREE_WUNLOCK();
5539 key_freesav(&sav);
5540 return (key_senderror(so, m, ESRCH));
5541 }
5542 /*
5543 * NOTE: there is possible state moving from DYING to MATURE,
5544 * but this doesn't change created time, so we won't reorder
5545 * this SA.
5546 */
5547 sav->state = SADB_SASTATE_MATURE;
5548 SAHTREE_WUNLOCK();
5549 }
5550 KEYDBG(KEY_STAMP,
5551 printf("%s: SA(%p)\n", __func__, sav));
5552 KEYDBG(KEY_DATA, kdebug_secasv(sav));
5553 key_freesav(&sav);
5554
5555 {
5556 struct mbuf *n;
5557
5558 /* set msg buf from mhp */
5559 n = key_getmsgbuf_x1(m, mhp);
5560 if (n == NULL) {
5561 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5562 return key_senderror(so, m, ENOBUFS);
5563 }
5564
5565 m_freem(m);
5566 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5567 }
5568 }
5569
5570 /*
5571 * SADB_ADD processing
5572 * add an entry to SA database, when received
5573 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5574 * key(AE), (identity(SD),) (sensitivity)>
5575 * from the ikmpd,
5576 * and send
5577 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5578 * (identity(SD),) (sensitivity)>
5579 * to the ikmpd.
5580 *
5581 * IGNORE identity and sensitivity messages.
5582 *
5583 * m will always be freed.
5584 */
5585 static int
key_add(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)5586 key_add(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5587 {
5588 struct secasindex saidx;
5589 struct sadb_address *src0, *dst0;
5590 struct sadb_sa *sa0;
5591 struct secasvar *sav;
5592 uint32_t reqid, spi;
5593 uint8_t mode, proto;
5594 int error;
5595
5596 IPSEC_ASSERT(so != NULL, ("null socket"));
5597 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5598 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5599 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5600
5601 /* map satype to proto */
5602 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5603 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5604 __func__));
5605 return key_senderror(so, m, EINVAL);
5606 }
5607
5608 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
5609 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
5610 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
5611 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && (
5612 SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT) ||
5613 SADB_CHECKLEN(mhp, SADB_EXT_KEY_ENCRYPT))) ||
5614 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && (
5615 SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH) ||
5616 SADB_CHECKLEN(mhp, SADB_EXT_KEY_AUTH))) ||
5617 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
5618 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
5619 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
5620 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
5621 ipseclog((LOG_DEBUG,
5622 "%s: invalid message: missing required header.\n",
5623 __func__));
5624 return key_senderror(so, m, EINVAL);
5625 }
5626 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
5627 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
5628 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
5629 ipseclog((LOG_DEBUG,
5630 "%s: invalid message: wrong header size.\n", __func__));
5631 return key_senderror(so, m, EINVAL);
5632 }
5633 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
5634 mode = IPSEC_MODE_ANY;
5635 reqid = 0;
5636 } else {
5637 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
5638 ipseclog((LOG_DEBUG,
5639 "%s: invalid message: wrong header size.\n",
5640 __func__));
5641 return key_senderror(so, m, EINVAL);
5642 }
5643 mode = ((struct sadb_x_sa2 *)
5644 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
5645 reqid = ((struct sadb_x_sa2 *)
5646 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
5647 }
5648
5649 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5650 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
5651 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
5652
5653 /*
5654 * Only SADB_SASTATE_MATURE SAs may be submitted in an
5655 * SADB_ADD message.
5656 */
5657 if (sa0->sadb_sa_state != SADB_SASTATE_MATURE) {
5658 ipseclog((LOG_DEBUG, "%s: invalid state.\n", __func__));
5659 #ifdef PFKEY_STRICT_CHECKS
5660 return key_senderror(so, m, EINVAL);
5661 #endif
5662 }
5663 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
5664 (struct sockaddr *)(dst0 + 1));
5665 if (error != 0) {
5666 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
5667 return key_senderror(so, m, error);
5668 }
5669 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
5670 spi = sa0->sadb_sa_spi;
5671 /*
5672 * For TCP-MD5 SAs we don't use SPI. Check the uniqueness using
5673 * secasindex.
5674 * XXXAE: IPComp seems also doesn't use SPI.
5675 */
5676 SPI_ALLOC_LOCK();
5677 if (proto == IPPROTO_TCP) {
5678 sav = key_getsav_tcpmd5(&saidx, &spi);
5679 if (sav == NULL && spi == 0) {
5680 SPI_ALLOC_UNLOCK();
5681 /* Failed to allocate SPI */
5682 ipseclog((LOG_DEBUG, "%s: SA already exists.\n",
5683 __func__));
5684 return key_senderror(so, m, EEXIST);
5685 }
5686 /* XXX: SPI that we report back can have another value */
5687 } else {
5688 /* We can create new SA only if SPI is different. */
5689 sav = key_getsavbyspi(spi);
5690 }
5691 if (sav != NULL) {
5692 SPI_ALLOC_UNLOCK();
5693 key_freesav(&sav);
5694 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__));
5695 return key_senderror(so, m, EEXIST);
5696 }
5697
5698 sav = key_newsav(mhp, &saidx, spi, &error);
5699 SPI_ALLOC_UNLOCK();
5700 if (sav == NULL)
5701 return key_senderror(so, m, error);
5702 KEYDBG(KEY_STAMP,
5703 printf("%s: return SA(%p)\n", __func__, sav));
5704 KEYDBG(KEY_DATA, kdebug_secasv(sav));
5705 /*
5706 * If SADB_ADD was in response to SADB_ACQUIRE, we need to schedule
5707 * ACQ for deletion.
5708 */
5709 if (sav->seq != 0)
5710 key_acqdone(&saidx, sav->seq);
5711
5712 {
5713 /*
5714 * Don't call key_freesav() on error here, as we would like to
5715 * keep the SA in the database.
5716 */
5717 struct mbuf *n;
5718
5719 /* set msg buf from mhp */
5720 n = key_getmsgbuf_x1(m, mhp);
5721 if (n == NULL) {
5722 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5723 return key_senderror(so, m, ENOBUFS);
5724 }
5725
5726 m_freem(m);
5727 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5728 }
5729 }
5730
5731 /*
5732 * NAT-T support.
5733 * IKEd may request the use ESP in UDP encapsulation when it detects the
5734 * presence of NAT. It uses NAT-T extension headers for such SAs to specify
5735 * parameters needed for encapsulation and decapsulation. These PF_KEY
5736 * extension headers are not standardized, so this comment addresses our
5737 * implementation.
5738 * SADB_X_EXT_NAT_T_TYPE specifies type of encapsulation, we support only
5739 * UDP_ENCAP_ESPINUDP as described in RFC3948.
5740 * SADB_X_EXT_NAT_T_SPORT/DPORT specifies source and destination ports for
5741 * UDP header. We use these ports in UDP encapsulation procedure, also we
5742 * can check them in UDP decapsulation procedure.
5743 * SADB_X_EXT_NAT_T_OA[IR] specifies original address of initiator or
5744 * responder. These addresses can be used for transport mode to adjust
5745 * checksum after decapsulation and decryption. Since original IP addresses
5746 * used by peer usually different (we detected presence of NAT), TCP/UDP
5747 * pseudo header checksum and IP header checksum was calculated using original
5748 * addresses. After decapsulation and decryption we need to adjust checksum
5749 * to have correct datagram.
5750 *
5751 * We expect presence of NAT-T extension headers only in SADB_ADD and
5752 * SADB_UPDATE messages. We report NAT-T extension headers in replies
5753 * to SADB_ADD, SADB_UPDATE, SADB_GET, and SADB_DUMP messages.
5754 */
5755 static int
key_setnatt(struct secasvar * sav,const struct sadb_msghdr * mhp)5756 key_setnatt(struct secasvar *sav, const struct sadb_msghdr *mhp)
5757 {
5758 struct sadb_x_nat_t_port *port;
5759 struct sadb_x_nat_t_type *type;
5760 struct sadb_address *oai, *oar;
5761 struct sockaddr *sa;
5762 uint32_t addr;
5763 uint16_t cksum;
5764
5765 IPSEC_ASSERT(sav->natt == NULL, ("natt is already initialized"));
5766 /*
5767 * Ignore NAT-T headers if sproto isn't ESP.
5768 */
5769 if (sav->sah->saidx.proto != IPPROTO_ESP)
5770 return (0);
5771
5772 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) &&
5773 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_SPORT) &&
5774 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5775 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5776 SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_SPORT) ||
5777 SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5778 ipseclog((LOG_DEBUG,
5779 "%s: invalid message: wrong header size.\n",
5780 __func__));
5781 return (EINVAL);
5782 }
5783 } else
5784 return (0);
5785
5786 type = (struct sadb_x_nat_t_type *)mhp->ext[SADB_X_EXT_NAT_T_TYPE];
5787 if (type->sadb_x_nat_t_type_type != UDP_ENCAP_ESPINUDP) {
5788 ipseclog((LOG_DEBUG, "%s: unsupported NAT-T type %u.\n",
5789 __func__, type->sadb_x_nat_t_type_type));
5790 return (EINVAL);
5791 }
5792 /*
5793 * Allocate storage for NAT-T config.
5794 * On error it will be released by key_cleansav().
5795 */
5796 sav->natt = malloc(sizeof(struct secnatt), M_IPSEC_MISC,
5797 M_NOWAIT | M_ZERO);
5798 if (sav->natt == NULL) {
5799 PFKEYSTAT_INC(in_nomem);
5800 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5801 return (ENOBUFS);
5802 }
5803 port = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_SPORT];
5804 if (port->sadb_x_nat_t_port_port == 0) {
5805 ipseclog((LOG_DEBUG, "%s: invalid NAT-T sport specified.\n",
5806 __func__));
5807 return (EINVAL);
5808 }
5809 sav->natt->sport = port->sadb_x_nat_t_port_port;
5810 port = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_DPORT];
5811 if (port->sadb_x_nat_t_port_port == 0) {
5812 ipseclog((LOG_DEBUG, "%s: invalid NAT-T dport specified.\n",
5813 __func__));
5814 return (EINVAL);
5815 }
5816 sav->natt->dport = port->sadb_x_nat_t_port_port;
5817
5818 /*
5819 * SADB_X_EXT_NAT_T_OAI and SADB_X_EXT_NAT_T_OAR are optional
5820 * and needed only for transport mode IPsec.
5821 * Usually NAT translates only one address, but it is possible,
5822 * that both addresses could be translated.
5823 * NOTE: Value of SADB_X_EXT_NAT_T_OAI is equal to SADB_X_EXT_NAT_T_OA.
5824 */
5825 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_OAI)) {
5826 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_OAI)) {
5827 ipseclog((LOG_DEBUG,
5828 "%s: invalid message: wrong header size.\n",
5829 __func__));
5830 return (EINVAL);
5831 }
5832 oai = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI];
5833 } else
5834 oai = NULL;
5835 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_OAR)) {
5836 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_OAR)) {
5837 ipseclog((LOG_DEBUG,
5838 "%s: invalid message: wrong header size.\n",
5839 __func__));
5840 return (EINVAL);
5841 }
5842 oar = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR];
5843 } else
5844 oar = NULL;
5845
5846 /* Initialize addresses only for transport mode */
5847 if (sav->sah->saidx.mode != IPSEC_MODE_TUNNEL) {
5848 cksum = 0;
5849 if (oai != NULL) {
5850 /* Currently we support only AF_INET */
5851 sa = (struct sockaddr *)(oai + 1);
5852 if (sa->sa_family != AF_INET ||
5853 sa->sa_len != sizeof(struct sockaddr_in)) {
5854 ipseclog((LOG_DEBUG,
5855 "%s: wrong NAT-OAi header.\n",
5856 __func__));
5857 return (EINVAL);
5858 }
5859 /* Ignore address if it the same */
5860 if (((struct sockaddr_in *)sa)->sin_addr.s_addr !=
5861 sav->sah->saidx.src.sin.sin_addr.s_addr) {
5862 bcopy(sa, &sav->natt->oai.sa, sa->sa_len);
5863 sav->natt->flags |= IPSEC_NATT_F_OAI;
5864 /* Calculate checksum delta */
5865 addr = sav->sah->saidx.src.sin.sin_addr.s_addr;
5866 cksum = in_addword(cksum, ~addr >> 16);
5867 cksum = in_addword(cksum, ~addr & 0xffff);
5868 addr = sav->natt->oai.sin.sin_addr.s_addr;
5869 cksum = in_addword(cksum, addr >> 16);
5870 cksum = in_addword(cksum, addr & 0xffff);
5871 }
5872 }
5873 if (oar != NULL) {
5874 /* Currently we support only AF_INET */
5875 sa = (struct sockaddr *)(oar + 1);
5876 if (sa->sa_family != AF_INET ||
5877 sa->sa_len != sizeof(struct sockaddr_in)) {
5878 ipseclog((LOG_DEBUG,
5879 "%s: wrong NAT-OAr header.\n",
5880 __func__));
5881 return (EINVAL);
5882 }
5883 /* Ignore address if it the same */
5884 if (((struct sockaddr_in *)sa)->sin_addr.s_addr !=
5885 sav->sah->saidx.dst.sin.sin_addr.s_addr) {
5886 bcopy(sa, &sav->natt->oar.sa, sa->sa_len);
5887 sav->natt->flags |= IPSEC_NATT_F_OAR;
5888 /* Calculate checksum delta */
5889 addr = sav->sah->saidx.dst.sin.sin_addr.s_addr;
5890 cksum = in_addword(cksum, ~addr >> 16);
5891 cksum = in_addword(cksum, ~addr & 0xffff);
5892 addr = sav->natt->oar.sin.sin_addr.s_addr;
5893 cksum = in_addword(cksum, addr >> 16);
5894 cksum = in_addword(cksum, addr & 0xffff);
5895 }
5896 }
5897 sav->natt->cksum = cksum;
5898 }
5899 return (0);
5900 }
5901
5902 static int
key_setident(struct secashead * sah,const struct sadb_msghdr * mhp)5903 key_setident(struct secashead *sah, const struct sadb_msghdr *mhp)
5904 {
5905 const struct sadb_ident *idsrc, *iddst;
5906
5907 IPSEC_ASSERT(sah != NULL, ("null secashead"));
5908 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5909 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5910
5911 /* don't make buffer if not there */
5912 if (SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_SRC) &&
5913 SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_DST)) {
5914 sah->idents = NULL;
5915 sah->identd = NULL;
5916 return (0);
5917 }
5918
5919 if (SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_SRC) ||
5920 SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_DST)) {
5921 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__));
5922 return (EINVAL);
5923 }
5924
5925 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC];
5926 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST];
5927
5928 /* validity check */
5929 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) {
5930 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__));
5931 return EINVAL;
5932 }
5933
5934 switch (idsrc->sadb_ident_type) {
5935 case SADB_IDENTTYPE_PREFIX:
5936 case SADB_IDENTTYPE_FQDN:
5937 case SADB_IDENTTYPE_USERFQDN:
5938 default:
5939 /* XXX do nothing */
5940 sah->idents = NULL;
5941 sah->identd = NULL;
5942 return 0;
5943 }
5944
5945 /* make structure */
5946 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
5947 if (sah->idents == NULL) {
5948 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5949 return ENOBUFS;
5950 }
5951 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
5952 if (sah->identd == NULL) {
5953 free(sah->idents, M_IPSEC_MISC);
5954 sah->idents = NULL;
5955 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5956 return ENOBUFS;
5957 }
5958 sah->idents->type = idsrc->sadb_ident_type;
5959 sah->idents->id = idsrc->sadb_ident_id;
5960
5961 sah->identd->type = iddst->sadb_ident_type;
5962 sah->identd->id = iddst->sadb_ident_id;
5963
5964 return 0;
5965 }
5966
5967 /*
5968 * m will not be freed on return.
5969 * it is caller's responsibility to free the result.
5970 *
5971 * Called from SADB_ADD and SADB_UPDATE. Reply will contain headers
5972 * from the request in defined order.
5973 */
5974 static struct mbuf *
key_getmsgbuf_x1(struct mbuf * m,const struct sadb_msghdr * mhp)5975 key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp)
5976 {
5977 struct mbuf *n;
5978
5979 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5980 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5981 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5982
5983 /* create new sadb_msg to reply. */
5984 n = key_gather_mbuf(m, mhp, 1, 16, SADB_EXT_RESERVED,
5985 SADB_EXT_SA, SADB_X_EXT_SA2,
5986 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST,
5987 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
5988 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST,
5989 SADB_X_EXT_NAT_T_TYPE, SADB_X_EXT_NAT_T_SPORT,
5990 SADB_X_EXT_NAT_T_DPORT, SADB_X_EXT_NAT_T_OAI,
5991 SADB_X_EXT_NAT_T_OAR, SADB_X_EXT_NEW_ADDRESS_SRC,
5992 SADB_X_EXT_NEW_ADDRESS_DST);
5993 if (!n)
5994 return NULL;
5995
5996 if (n->m_len < sizeof(struct sadb_msg)) {
5997 n = m_pullup(n, sizeof(struct sadb_msg));
5998 if (n == NULL)
5999 return NULL;
6000 }
6001 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0;
6002 mtod(n, struct sadb_msg *)->sadb_msg_len =
6003 PFKEY_UNIT64(n->m_pkthdr.len);
6004
6005 return n;
6006 }
6007
6008 /*
6009 * SADB_DELETE processing
6010 * receive
6011 * <base, SA(*), address(SD)>
6012 * from the ikmpd, and set SADB_SASTATE_DEAD,
6013 * and send,
6014 * <base, SA(*), address(SD)>
6015 * to the ikmpd.
6016 *
6017 * m will always be freed.
6018 */
6019 static int
key_delete(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)6020 key_delete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6021 {
6022 struct secasindex saidx;
6023 struct sadb_address *src0, *dst0;
6024 struct secasvar *sav;
6025 struct sadb_sa *sa0;
6026 uint8_t proto;
6027
6028 IPSEC_ASSERT(so != NULL, ("null socket"));
6029 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6030 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6031 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6032
6033 /* map satype to proto */
6034 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6035 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
6036 __func__));
6037 return key_senderror(so, m, EINVAL);
6038 }
6039
6040 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
6041 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
6042 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
6043 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
6044 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
6045 __func__));
6046 return key_senderror(so, m, EINVAL);
6047 }
6048
6049 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
6050 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
6051
6052 if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
6053 (struct sockaddr *)(dst0 + 1)) != 0) {
6054 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
6055 return (key_senderror(so, m, EINVAL));
6056 }
6057 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
6058 if (SADB_CHECKHDR(mhp, SADB_EXT_SA)) {
6059 /*
6060 * Caller wants us to delete all non-LARVAL SAs
6061 * that match the src/dst. This is used during
6062 * IKE INITIAL-CONTACT.
6063 * XXXAE: this looks like some extension to RFC2367.
6064 */
6065 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__));
6066 return (key_delete_all(so, m, mhp, &saidx));
6067 }
6068 if (SADB_CHECKLEN(mhp, SADB_EXT_SA)) {
6069 ipseclog((LOG_DEBUG,
6070 "%s: invalid message: wrong header size.\n", __func__));
6071 return (key_senderror(so, m, EINVAL));
6072 }
6073 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
6074 SPI_ALLOC_LOCK();
6075 if (proto == IPPROTO_TCP)
6076 sav = key_getsav_tcpmd5(&saidx, NULL);
6077 else
6078 sav = key_getsavbyspi(sa0->sadb_sa_spi);
6079 SPI_ALLOC_UNLOCK();
6080 if (sav == NULL) {
6081 ipseclog((LOG_DEBUG, "%s: no SA found for SPI %u.\n",
6082 __func__, ntohl(sa0->sadb_sa_spi)));
6083 return (key_senderror(so, m, ESRCH));
6084 }
6085 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_HEAD) == 0) {
6086 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u.\n",
6087 __func__, ntohl(sav->spi)));
6088 key_freesav(&sav);
6089 return (key_senderror(so, m, ESRCH));
6090 }
6091 KEYDBG(KEY_STAMP,
6092 printf("%s: SA(%p)\n", __func__, sav));
6093 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6094 key_unlinksav(sav);
6095 key_freesav(&sav);
6096
6097 {
6098 struct mbuf *n;
6099 struct sadb_msg *newmsg;
6100
6101 /* create new sadb_msg to reply. */
6102 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
6103 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
6104 if (!n)
6105 return key_senderror(so, m, ENOBUFS);
6106
6107 if (n->m_len < sizeof(struct sadb_msg)) {
6108 n = m_pullup(n, sizeof(struct sadb_msg));
6109 if (n == NULL)
6110 return key_senderror(so, m, ENOBUFS);
6111 }
6112 newmsg = mtod(n, struct sadb_msg *);
6113 newmsg->sadb_msg_errno = 0;
6114 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
6115
6116 m_freem(m);
6117 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
6118 }
6119 }
6120
6121 /*
6122 * delete all SAs for src/dst. Called from key_delete().
6123 */
6124 static int
key_delete_all(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp,struct secasindex * saidx)6125 key_delete_all(struct socket *so, struct mbuf *m,
6126 const struct sadb_msghdr *mhp, struct secasindex *saidx)
6127 {
6128 struct secasvar_queue drainq;
6129 struct secashead *sah;
6130 struct secasvar *sav, *nextsav;
6131
6132 TAILQ_INIT(&drainq);
6133 SAHTREE_WLOCK();
6134 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
6135 if (key_cmpsaidx(&sah->saidx, saidx, CMP_HEAD) == 0)
6136 continue;
6137 /* Move all ALIVE SAs into drainq */
6138 TAILQ_CONCAT(&drainq, &sah->savtree_alive, chain);
6139 }
6140 /* Unlink all queued SAs from SPI hash */
6141 TAILQ_FOREACH(sav, &drainq, chain) {
6142 sav->state = SADB_SASTATE_DEAD;
6143 LIST_REMOVE(sav, spihash);
6144 }
6145 SAHTREE_WUNLOCK();
6146 /* Now we can release reference for all SAs in drainq */
6147 sav = TAILQ_FIRST(&drainq);
6148 while (sav != NULL) {
6149 KEYDBG(KEY_STAMP,
6150 printf("%s: SA(%p)\n", __func__, sav));
6151 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6152 nextsav = TAILQ_NEXT(sav, chain);
6153 key_freesah(&sav->sah); /* release reference from SAV */
6154 key_freesav(&sav); /* release last reference */
6155 sav = nextsav;
6156 }
6157
6158 {
6159 struct mbuf *n;
6160 struct sadb_msg *newmsg;
6161
6162 /* create new sadb_msg to reply. */
6163 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED,
6164 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
6165 if (!n)
6166 return key_senderror(so, m, ENOBUFS);
6167
6168 if (n->m_len < sizeof(struct sadb_msg)) {
6169 n = m_pullup(n, sizeof(struct sadb_msg));
6170 if (n == NULL)
6171 return key_senderror(so, m, ENOBUFS);
6172 }
6173 newmsg = mtod(n, struct sadb_msg *);
6174 newmsg->sadb_msg_errno = 0;
6175 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
6176
6177 m_freem(m);
6178 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
6179 }
6180 }
6181
6182 /*
6183 * Delete all alive SAs for corresponding xform.
6184 * Larval SAs have not initialized tdb_xform, so it is safe to leave them
6185 * here when xform disappears.
6186 */
6187 void
key_delete_xform(const struct xformsw * xsp)6188 key_delete_xform(const struct xformsw *xsp)
6189 {
6190 struct secasvar_queue drainq;
6191 struct secashead *sah;
6192 struct secasvar *sav, *nextsav;
6193
6194 TAILQ_INIT(&drainq);
6195 SAHTREE_WLOCK();
6196 TAILQ_FOREACH(sah, &V_sahtree, chain) {
6197 sav = TAILQ_FIRST(&sah->savtree_alive);
6198 if (sav == NULL)
6199 continue;
6200 if (sav->tdb_xform != xsp)
6201 continue;
6202 /*
6203 * It is supposed that all SAs in the chain are related to
6204 * one xform.
6205 */
6206 TAILQ_CONCAT(&drainq, &sah->savtree_alive, chain);
6207 }
6208 /* Unlink all queued SAs from SPI hash */
6209 TAILQ_FOREACH(sav, &drainq, chain) {
6210 sav->state = SADB_SASTATE_DEAD;
6211 LIST_REMOVE(sav, spihash);
6212 }
6213 SAHTREE_WUNLOCK();
6214
6215 /* Now we can release reference for all SAs in drainq */
6216 sav = TAILQ_FIRST(&drainq);
6217 while (sav != NULL) {
6218 KEYDBG(KEY_STAMP,
6219 printf("%s: SA(%p)\n", __func__, sav));
6220 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6221 nextsav = TAILQ_NEXT(sav, chain);
6222 key_freesah(&sav->sah); /* release reference from SAV */
6223 key_freesav(&sav); /* release last reference */
6224 sav = nextsav;
6225 }
6226 }
6227
6228 /*
6229 * SADB_GET processing
6230 * receive
6231 * <base, SA(*), address(SD)>
6232 * from the ikmpd, and get a SP and a SA to respond,
6233 * and send,
6234 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE),
6235 * (identity(SD),) (sensitivity)>
6236 * to the ikmpd.
6237 *
6238 * m will always be freed.
6239 */
6240 static int
key_get(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)6241 key_get(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6242 {
6243 struct secasindex saidx;
6244 struct sadb_address *src0, *dst0;
6245 struct sadb_sa *sa0;
6246 struct secasvar *sav;
6247 uint8_t proto;
6248
6249 IPSEC_ASSERT(so != NULL, ("null socket"));
6250 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6251 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6252 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6253
6254 /* map satype to proto */
6255 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6256 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
6257 __func__));
6258 return key_senderror(so, m, EINVAL);
6259 }
6260
6261 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
6262 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
6263 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST)) {
6264 ipseclog((LOG_DEBUG,
6265 "%s: invalid message: missing required header.\n",
6266 __func__));
6267 return key_senderror(so, m, EINVAL);
6268 }
6269 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
6270 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
6271 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
6272 ipseclog((LOG_DEBUG,
6273 "%s: invalid message: wrong header size.\n", __func__));
6274 return key_senderror(so, m, EINVAL);
6275 }
6276
6277 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
6278 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
6279 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
6280
6281 if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
6282 (struct sockaddr *)(dst0 + 1)) != 0) {
6283 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
6284 return key_senderror(so, m, EINVAL);
6285 }
6286 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
6287
6288 SPI_ALLOC_LOCK();
6289 if (proto == IPPROTO_TCP)
6290 sav = key_getsav_tcpmd5(&saidx, NULL);
6291 else
6292 sav = key_getsavbyspi(sa0->sadb_sa_spi);
6293 SPI_ALLOC_UNLOCK();
6294 if (sav == NULL) {
6295 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__));
6296 return key_senderror(so, m, ESRCH);
6297 }
6298 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_HEAD) == 0) {
6299 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u.\n",
6300 __func__, ntohl(sa0->sadb_sa_spi)));
6301 key_freesav(&sav);
6302 return (key_senderror(so, m, ESRCH));
6303 }
6304
6305 {
6306 struct mbuf *n;
6307 uint8_t satype;
6308
6309 /* map proto to satype */
6310 if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0) {
6311 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n",
6312 __func__));
6313 key_freesav(&sav);
6314 return key_senderror(so, m, EINVAL);
6315 }
6316
6317 /* create new sadb_msg to reply. */
6318 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq,
6319 mhp->msg->sadb_msg_pid);
6320
6321 key_freesav(&sav);
6322 if (!n)
6323 return key_senderror(so, m, ENOBUFS);
6324
6325 m_freem(m);
6326 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
6327 }
6328 }
6329
6330 /* XXX make it sysctl-configurable? */
6331 static void
key_getcomb_setlifetime(struct sadb_comb * comb)6332 key_getcomb_setlifetime(struct sadb_comb *comb)
6333 {
6334
6335 comb->sadb_comb_soft_allocations = 1;
6336 comb->sadb_comb_hard_allocations = 1;
6337 comb->sadb_comb_soft_bytes = 0;
6338 comb->sadb_comb_hard_bytes = 0;
6339 comb->sadb_comb_hard_addtime = 86400; /* 1 day */
6340 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100;
6341 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */
6342 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100;
6343 }
6344
6345 /*
6346 * XXX reorder combinations by preference
6347 * XXX no idea if the user wants ESP authentication or not
6348 */
6349 static struct mbuf *
key_getcomb_ealg(void)6350 key_getcomb_ealg(void)
6351 {
6352 struct sadb_comb *comb;
6353 const struct enc_xform *algo;
6354 struct mbuf *result = NULL, *m, *n;
6355 int encmin;
6356 int i, off, o;
6357 int totlen;
6358 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6359
6360 m = NULL;
6361 for (i = 1; i <= SADB_EALG_MAX; i++) {
6362 algo = enc_algorithm_lookup(i);
6363 if (algo == NULL)
6364 continue;
6365
6366 /* discard algorithms with key size smaller than system min */
6367 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin)
6368 continue;
6369 if (_BITS(algo->minkey) < V_ipsec_esp_keymin)
6370 encmin = V_ipsec_esp_keymin;
6371 else
6372 encmin = _BITS(algo->minkey);
6373
6374 if (V_ipsec_esp_auth)
6375 m = key_getcomb_ah();
6376 else {
6377 IPSEC_ASSERT(l <= MLEN,
6378 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6379 MGET(m, M_NOWAIT, MT_DATA);
6380 if (m) {
6381 M_ALIGN(m, l);
6382 m->m_len = l;
6383 m->m_next = NULL;
6384 bzero(mtod(m, caddr_t), m->m_len);
6385 }
6386 }
6387 if (!m)
6388 goto fail;
6389
6390 totlen = 0;
6391 for (n = m; n; n = n->m_next)
6392 totlen += n->m_len;
6393 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l));
6394
6395 for (off = 0; off < totlen; off += l) {
6396 n = m_pulldown(m, off, l, &o);
6397 if (!n) {
6398 /* m is already freed */
6399 goto fail;
6400 }
6401 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o);
6402 bzero(comb, sizeof(*comb));
6403 key_getcomb_setlifetime(comb);
6404 comb->sadb_comb_encrypt = i;
6405 comb->sadb_comb_encrypt_minbits = encmin;
6406 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey);
6407 }
6408
6409 if (!result)
6410 result = m;
6411 else
6412 m_cat(result, m);
6413 }
6414
6415 return result;
6416
6417 fail:
6418 if (result)
6419 m_freem(result);
6420 return NULL;
6421 }
6422
6423 static void
key_getsizes_ah(const struct auth_hash * ah,int alg,u_int16_t * min,u_int16_t * max)6424 key_getsizes_ah(const struct auth_hash *ah, int alg, u_int16_t* min,
6425 u_int16_t* max)
6426 {
6427
6428 *min = *max = ah->hashsize;
6429 if (ah->keysize == 0) {
6430 /*
6431 * Transform takes arbitrary key size but algorithm
6432 * key size is restricted. Enforce this here.
6433 */
6434 switch (alg) {
6435 case SADB_X_AALG_NULL: *min = 1; *max = 256; break;
6436 case SADB_X_AALG_SHA2_256: *min = *max = 32; break;
6437 case SADB_X_AALG_SHA2_384: *min = *max = 48; break;
6438 case SADB_X_AALG_SHA2_512: *min = *max = 64; break;
6439 default:
6440 DPRINTF(("%s: unknown AH algorithm %u\n",
6441 __func__, alg));
6442 break;
6443 }
6444 }
6445 }
6446
6447 /*
6448 * XXX reorder combinations by preference
6449 */
6450 static struct mbuf *
key_getcomb_ah(void)6451 key_getcomb_ah(void)
6452 {
6453 const struct auth_hash *algo;
6454 struct sadb_comb *comb;
6455 struct mbuf *m;
6456 u_int16_t minkeysize, maxkeysize;
6457 int i;
6458 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6459
6460 m = NULL;
6461 for (i = 1; i <= SADB_AALG_MAX; i++) {
6462 #if 1
6463 /* we prefer HMAC algorithms, not old algorithms */
6464 if (i != SADB_AALG_SHA1HMAC &&
6465 i != SADB_X_AALG_SHA2_256 &&
6466 i != SADB_X_AALG_SHA2_384 &&
6467 i != SADB_X_AALG_SHA2_512)
6468 continue;
6469 #endif
6470 algo = auth_algorithm_lookup(i);
6471 if (!algo)
6472 continue;
6473 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize);
6474 /* discard algorithms with key size smaller than system min */
6475 if (_BITS(minkeysize) < V_ipsec_ah_keymin)
6476 continue;
6477
6478 if (!m) {
6479 IPSEC_ASSERT(l <= MLEN,
6480 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6481 MGET(m, M_NOWAIT, MT_DATA);
6482 if (m) {
6483 M_ALIGN(m, l);
6484 m->m_len = l;
6485 m->m_next = NULL;
6486 }
6487 } else
6488 M_PREPEND(m, l, M_NOWAIT);
6489 if (!m)
6490 return NULL;
6491
6492 comb = mtod(m, struct sadb_comb *);
6493 bzero(comb, sizeof(*comb));
6494 key_getcomb_setlifetime(comb);
6495 comb->sadb_comb_auth = i;
6496 comb->sadb_comb_auth_minbits = _BITS(minkeysize);
6497 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize);
6498 }
6499
6500 return m;
6501 }
6502
6503 /*
6504 * not really an official behavior. discussed in pf_key@inner.net in Sep2000.
6505 * XXX reorder combinations by preference
6506 */
6507 static struct mbuf *
key_getcomb_ipcomp(void)6508 key_getcomb_ipcomp(void)
6509 {
6510 const struct comp_algo *algo;
6511 struct sadb_comb *comb;
6512 struct mbuf *m;
6513 int i;
6514 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6515
6516 m = NULL;
6517 for (i = 1; i <= SADB_X_CALG_MAX; i++) {
6518 algo = comp_algorithm_lookup(i);
6519 if (!algo)
6520 continue;
6521
6522 if (!m) {
6523 IPSEC_ASSERT(l <= MLEN,
6524 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6525 MGET(m, M_NOWAIT, MT_DATA);
6526 if (m) {
6527 M_ALIGN(m, l);
6528 m->m_len = l;
6529 m->m_next = NULL;
6530 }
6531 } else
6532 M_PREPEND(m, l, M_NOWAIT);
6533 if (!m)
6534 return NULL;
6535
6536 comb = mtod(m, struct sadb_comb *);
6537 bzero(comb, sizeof(*comb));
6538 key_getcomb_setlifetime(comb);
6539 comb->sadb_comb_encrypt = i;
6540 /* what should we set into sadb_comb_*_{min,max}bits? */
6541 }
6542
6543 return m;
6544 }
6545
6546 /*
6547 * XXX no way to pass mode (transport/tunnel) to userland
6548 * XXX replay checking?
6549 * XXX sysctl interface to ipsec_{ah,esp}_keymin
6550 */
6551 static struct mbuf *
key_getprop(const struct secasindex * saidx)6552 key_getprop(const struct secasindex *saidx)
6553 {
6554 struct sadb_prop *prop;
6555 struct mbuf *m, *n;
6556 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop));
6557 int totlen;
6558
6559 switch (saidx->proto) {
6560 case IPPROTO_ESP:
6561 m = key_getcomb_ealg();
6562 break;
6563 case IPPROTO_AH:
6564 m = key_getcomb_ah();
6565 break;
6566 case IPPROTO_IPCOMP:
6567 m = key_getcomb_ipcomp();
6568 break;
6569 default:
6570 return NULL;
6571 }
6572
6573 if (!m)
6574 return NULL;
6575 M_PREPEND(m, l, M_NOWAIT);
6576 if (!m)
6577 return NULL;
6578
6579 totlen = 0;
6580 for (n = m; n; n = n->m_next)
6581 totlen += n->m_len;
6582
6583 prop = mtod(m, struct sadb_prop *);
6584 bzero(prop, sizeof(*prop));
6585 prop->sadb_prop_len = PFKEY_UNIT64(totlen);
6586 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL;
6587 prop->sadb_prop_replay = 32; /* XXX */
6588
6589 return m;
6590 }
6591
6592 /*
6593 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2().
6594 * send
6595 * <base, SA, address(SD), (address(P)), x_policy,
6596 * (identity(SD),) (sensitivity,) proposal>
6597 * to KMD, and expect to receive
6598 * <base> with SADB_ACQUIRE if error occurred,
6599 * or
6600 * <base, src address, dst address, (SPI range)> with SADB_GETSPI
6601 * from KMD by PF_KEY.
6602 *
6603 * XXX x_policy is outside of RFC2367 (KAME extension).
6604 * XXX sensitivity is not supported.
6605 * XXX for ipcomp, RFC2367 does not define how to fill in proposal.
6606 * see comment for key_getcomb_ipcomp().
6607 *
6608 * OUT:
6609 * 0 : succeed
6610 * others: error number
6611 */
6612 static int
key_acquire(const struct secasindex * saidx,struct secpolicy * sp)6613 key_acquire(const struct secasindex *saidx, struct secpolicy *sp)
6614 {
6615 union sockaddr_union addr;
6616 struct mbuf *result, *m;
6617 uint32_t seq;
6618 int error;
6619 uint16_t ul_proto;
6620 uint8_t mask, satype;
6621
6622 IPSEC_ASSERT(saidx != NULL, ("null saidx"));
6623 satype = key_proto2satype(saidx->proto);
6624 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto));
6625
6626 error = -1;
6627 result = NULL;
6628 ul_proto = IPSEC_ULPROTO_ANY;
6629
6630 /* Get seq number to check whether sending message or not. */
6631 seq = key_getacq(saidx, &error);
6632 if (seq == 0)
6633 return (error);
6634
6635 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0);
6636 if (!m) {
6637 error = ENOBUFS;
6638 goto fail;
6639 }
6640 result = m;
6641
6642 /*
6643 * set sadb_address for saidx's.
6644 *
6645 * Note that if sp is supplied, then we're being called from
6646 * key_allocsa_policy() and should supply port and protocol
6647 * information.
6648 * XXXAE: why only TCP and UDP? ICMP and SCTP looks applicable too.
6649 * XXXAE: probably we can handle this in the ipsec[46]_allocsa().
6650 * XXXAE: it looks like we should save this info in the ACQ entry.
6651 */
6652 if (sp != NULL && (sp->spidx.ul_proto == IPPROTO_TCP ||
6653 sp->spidx.ul_proto == IPPROTO_UDP))
6654 ul_proto = sp->spidx.ul_proto;
6655
6656 addr = saidx->src;
6657 mask = FULLMASK;
6658 if (ul_proto != IPSEC_ULPROTO_ANY) {
6659 switch (sp->spidx.src.sa.sa_family) {
6660 case AF_INET:
6661 if (sp->spidx.src.sin.sin_port != IPSEC_PORT_ANY) {
6662 addr.sin.sin_port = sp->spidx.src.sin.sin_port;
6663 mask = sp->spidx.prefs;
6664 }
6665 break;
6666 case AF_INET6:
6667 if (sp->spidx.src.sin6.sin6_port != IPSEC_PORT_ANY) {
6668 addr.sin6.sin6_port =
6669 sp->spidx.src.sin6.sin6_port;
6670 mask = sp->spidx.prefs;
6671 }
6672 break;
6673 default:
6674 break;
6675 }
6676 }
6677 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &addr.sa, mask, ul_proto);
6678 if (!m) {
6679 error = ENOBUFS;
6680 goto fail;
6681 }
6682 m_cat(result, m);
6683
6684 addr = saidx->dst;
6685 mask = FULLMASK;
6686 if (ul_proto != IPSEC_ULPROTO_ANY) {
6687 switch (sp->spidx.dst.sa.sa_family) {
6688 case AF_INET:
6689 if (sp->spidx.dst.sin.sin_port != IPSEC_PORT_ANY) {
6690 addr.sin.sin_port = sp->spidx.dst.sin.sin_port;
6691 mask = sp->spidx.prefd;
6692 }
6693 break;
6694 case AF_INET6:
6695 if (sp->spidx.dst.sin6.sin6_port != IPSEC_PORT_ANY) {
6696 addr.sin6.sin6_port =
6697 sp->spidx.dst.sin6.sin6_port;
6698 mask = sp->spidx.prefd;
6699 }
6700 break;
6701 default:
6702 break;
6703 }
6704 }
6705 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &addr.sa, mask, ul_proto);
6706 if (!m) {
6707 error = ENOBUFS;
6708 goto fail;
6709 }
6710 m_cat(result, m);
6711
6712 /* XXX proxy address (optional) */
6713
6714 /*
6715 * Set sadb_x_policy. This is KAME extension to RFC2367.
6716 */
6717 if (sp != NULL) {
6718 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id,
6719 sp->priority);
6720 if (!m) {
6721 error = ENOBUFS;
6722 goto fail;
6723 }
6724 m_cat(result, m);
6725 }
6726
6727 /*
6728 * Set sadb_x_sa2 extension if saidx->reqid is not zero.
6729 * This is FreeBSD extension to RFC2367.
6730 */
6731 if (saidx->reqid != 0) {
6732 m = key_setsadbxsa2(saidx->mode, 0, saidx->reqid);
6733 if (m == NULL) {
6734 error = ENOBUFS;
6735 goto fail;
6736 }
6737 m_cat(result, m);
6738 }
6739 /* XXX identity (optional) */
6740 #if 0
6741 if (idexttype && fqdn) {
6742 /* create identity extension (FQDN) */
6743 struct sadb_ident *id;
6744 int fqdnlen;
6745
6746 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */
6747 id = (struct sadb_ident *)p;
6748 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
6749 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
6750 id->sadb_ident_exttype = idexttype;
6751 id->sadb_ident_type = SADB_IDENTTYPE_FQDN;
6752 bcopy(fqdn, id + 1, fqdnlen);
6753 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen);
6754 }
6755
6756 if (idexttype) {
6757 /* create identity extension (USERFQDN) */
6758 struct sadb_ident *id;
6759 int userfqdnlen;
6760
6761 if (userfqdn) {
6762 /* +1 for terminating-NUL */
6763 userfqdnlen = strlen(userfqdn) + 1;
6764 } else
6765 userfqdnlen = 0;
6766 id = (struct sadb_ident *)p;
6767 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
6768 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
6769 id->sadb_ident_exttype = idexttype;
6770 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN;
6771 /* XXX is it correct? */
6772 if (curproc && curproc->p_cred)
6773 id->sadb_ident_id = curproc->p_cred->p_ruid;
6774 if (userfqdn && userfqdnlen)
6775 bcopy(userfqdn, id + 1, userfqdnlen);
6776 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen);
6777 }
6778 #endif
6779
6780 /* XXX sensitivity (optional) */
6781
6782 /* create proposal/combination extension */
6783 m = key_getprop(saidx);
6784 #if 0
6785 /*
6786 * spec conformant: always attach proposal/combination extension,
6787 * the problem is that we have no way to attach it for ipcomp,
6788 * due to the way sadb_comb is declared in RFC2367.
6789 */
6790 if (!m) {
6791 error = ENOBUFS;
6792 goto fail;
6793 }
6794 m_cat(result, m);
6795 #else
6796 /*
6797 * outside of spec; make proposal/combination extension optional.
6798 */
6799 if (m)
6800 m_cat(result, m);
6801 #endif
6802
6803 if ((result->m_flags & M_PKTHDR) == 0) {
6804 error = EINVAL;
6805 goto fail;
6806 }
6807
6808 if (result->m_len < sizeof(struct sadb_msg)) {
6809 result = m_pullup(result, sizeof(struct sadb_msg));
6810 if (result == NULL) {
6811 error = ENOBUFS;
6812 goto fail;
6813 }
6814 }
6815
6816 result->m_pkthdr.len = 0;
6817 for (m = result; m; m = m->m_next)
6818 result->m_pkthdr.len += m->m_len;
6819
6820 mtod(result, struct sadb_msg *)->sadb_msg_len =
6821 PFKEY_UNIT64(result->m_pkthdr.len);
6822
6823 KEYDBG(KEY_STAMP,
6824 printf("%s: SP(%p)\n", __func__, sp));
6825 KEYDBG(KEY_DATA, kdebug_secasindex(saidx, NULL));
6826
6827 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
6828
6829 fail:
6830 if (result)
6831 m_freem(result);
6832 return error;
6833 }
6834
6835 static uint32_t
key_newacq(const struct secasindex * saidx,int * perror)6836 key_newacq(const struct secasindex *saidx, int *perror)
6837 {
6838 struct secacq *acq;
6839 uint32_t seq;
6840
6841 acq = malloc(sizeof(*acq), M_IPSEC_SAQ, M_NOWAIT | M_ZERO);
6842 if (acq == NULL) {
6843 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
6844 *perror = ENOBUFS;
6845 return (0);
6846 }
6847
6848 /* copy secindex */
6849 bcopy(saidx, &acq->saidx, sizeof(acq->saidx));
6850 acq->created = time_second;
6851 acq->count = 0;
6852
6853 /* add to acqtree */
6854 ACQ_LOCK();
6855 seq = acq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq);
6856 LIST_INSERT_HEAD(&V_acqtree, acq, chain);
6857 LIST_INSERT_HEAD(ACQADDRHASH_HASH(saidx), acq, addrhash);
6858 LIST_INSERT_HEAD(ACQSEQHASH_HASH(seq), acq, seqhash);
6859 ACQ_UNLOCK();
6860 *perror = 0;
6861 return (seq);
6862 }
6863
6864 static uint32_t
key_getacq(const struct secasindex * saidx,int * perror)6865 key_getacq(const struct secasindex *saidx, int *perror)
6866 {
6867 struct secacq *acq;
6868 uint32_t seq;
6869
6870 ACQ_LOCK();
6871 LIST_FOREACH(acq, ACQADDRHASH_HASH(saidx), addrhash) {
6872 if (key_cmpsaidx(&acq->saidx, saidx, CMP_EXACTLY)) {
6873 if (acq->count > V_key_blockacq_count) {
6874 /*
6875 * Reset counter and send message.
6876 * Also reset created time to keep ACQ for
6877 * this saidx.
6878 */
6879 acq->created = time_second;
6880 acq->count = 0;
6881 seq = acq->seq;
6882 } else {
6883 /*
6884 * Increment counter and do nothing.
6885 * We send SADB_ACQUIRE message only
6886 * for each V_key_blockacq_count packet.
6887 */
6888 acq->count++;
6889 seq = 0;
6890 }
6891 break;
6892 }
6893 }
6894 ACQ_UNLOCK();
6895 if (acq != NULL) {
6896 *perror = 0;
6897 return (seq);
6898 }
6899 /* allocate new entry */
6900 return (key_newacq(saidx, perror));
6901 }
6902
6903 static int
key_acqreset(uint32_t seq)6904 key_acqreset(uint32_t seq)
6905 {
6906 struct secacq *acq;
6907
6908 ACQ_LOCK();
6909 LIST_FOREACH(acq, ACQSEQHASH_HASH(seq), seqhash) {
6910 if (acq->seq == seq) {
6911 acq->count = 0;
6912 acq->created = time_second;
6913 break;
6914 }
6915 }
6916 ACQ_UNLOCK();
6917 if (acq == NULL)
6918 return (ESRCH);
6919 return (0);
6920 }
6921 /*
6922 * Mark ACQ entry as stale to remove it in key_flush_acq().
6923 * Called after successful SADB_GETSPI message.
6924 */
6925 static int
key_acqdone(const struct secasindex * saidx,uint32_t seq)6926 key_acqdone(const struct secasindex *saidx, uint32_t seq)
6927 {
6928 struct secacq *acq;
6929
6930 ACQ_LOCK();
6931 LIST_FOREACH(acq, ACQSEQHASH_HASH(seq), seqhash) {
6932 if (acq->seq == seq)
6933 break;
6934 }
6935 if (acq != NULL) {
6936 if (key_cmpsaidx(&acq->saidx, saidx, CMP_EXACTLY) == 0) {
6937 ipseclog((LOG_DEBUG,
6938 "%s: Mismatched saidx for ACQ %u\n", __func__, seq));
6939 acq = NULL;
6940 } else {
6941 acq->created = 0;
6942 }
6943 } else {
6944 ipseclog((LOG_DEBUG,
6945 "%s: ACQ %u is not found.\n", __func__, seq));
6946 }
6947 ACQ_UNLOCK();
6948 if (acq == NULL)
6949 return (ESRCH);
6950 return (0);
6951 }
6952
6953 static struct secspacq *
key_newspacq(struct secpolicyindex * spidx)6954 key_newspacq(struct secpolicyindex *spidx)
6955 {
6956 struct secspacq *acq;
6957
6958 /* get new entry */
6959 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO);
6960 if (acq == NULL) {
6961 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
6962 return NULL;
6963 }
6964
6965 /* copy secindex */
6966 bcopy(spidx, &acq->spidx, sizeof(acq->spidx));
6967 acq->created = time_second;
6968 acq->count = 0;
6969
6970 /* add to spacqtree */
6971 SPACQ_LOCK();
6972 LIST_INSERT_HEAD(&V_spacqtree, acq, chain);
6973 SPACQ_UNLOCK();
6974
6975 return acq;
6976 }
6977
6978 static struct secspacq *
key_getspacq(struct secpolicyindex * spidx)6979 key_getspacq(struct secpolicyindex *spidx)
6980 {
6981 struct secspacq *acq;
6982
6983 SPACQ_LOCK();
6984 LIST_FOREACH(acq, &V_spacqtree, chain) {
6985 if (key_cmpspidx_exactly(spidx, &acq->spidx)) {
6986 /* NB: return holding spacq_lock */
6987 return acq;
6988 }
6989 }
6990 SPACQ_UNLOCK();
6991
6992 return NULL;
6993 }
6994
6995 /*
6996 * SADB_ACQUIRE processing,
6997 * in first situation, is receiving
6998 * <base>
6999 * from the ikmpd, and clear sequence of its secasvar entry.
7000 *
7001 * In second situation, is receiving
7002 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
7003 * from a user land process, and return
7004 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
7005 * to the socket.
7006 *
7007 * m will always be freed.
7008 */
7009 static int
key_acquire2(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7010 key_acquire2(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7011 {
7012 SAHTREE_RLOCK_TRACKER;
7013 struct sadb_address *src0, *dst0;
7014 struct secasindex saidx;
7015 struct secashead *sah;
7016 uint32_t reqid;
7017 int error;
7018 uint8_t mode, proto;
7019
7020 IPSEC_ASSERT(so != NULL, ("null socket"));
7021 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7022 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7023 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7024
7025 /*
7026 * Error message from KMd.
7027 * We assume that if error was occurred in IKEd, the length of PFKEY
7028 * message is equal to the size of sadb_msg structure.
7029 * We do not raise error even if error occurred in this function.
7030 */
7031 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) {
7032 /* check sequence number */
7033 if (mhp->msg->sadb_msg_seq == 0 ||
7034 mhp->msg->sadb_msg_errno == 0) {
7035 ipseclog((LOG_DEBUG, "%s: must specify sequence "
7036 "number and errno.\n", __func__));
7037 } else {
7038 /*
7039 * IKEd reported that error occurred.
7040 * XXXAE: what it expects from the kernel?
7041 * Probably we should send SADB_ACQUIRE again?
7042 * If so, reset ACQ's state.
7043 * XXXAE: it looks useless.
7044 */
7045 key_acqreset(mhp->msg->sadb_msg_seq);
7046 }
7047 m_freem(m);
7048 return (0);
7049 }
7050
7051 /*
7052 * This message is from user land.
7053 */
7054
7055 /* map satype to proto */
7056 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7057 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7058 __func__));
7059 return key_senderror(so, m, EINVAL);
7060 }
7061
7062 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
7063 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
7064 SADB_CHECKHDR(mhp, SADB_EXT_PROPOSAL)) {
7065 ipseclog((LOG_DEBUG,
7066 "%s: invalid message: missing required header.\n",
7067 __func__));
7068 return key_senderror(so, m, EINVAL);
7069 }
7070 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
7071 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
7072 SADB_CHECKLEN(mhp, SADB_EXT_PROPOSAL)) {
7073 ipseclog((LOG_DEBUG,
7074 "%s: invalid message: wrong header size.\n", __func__));
7075 return key_senderror(so, m, EINVAL);
7076 }
7077
7078 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
7079 mode = IPSEC_MODE_ANY;
7080 reqid = 0;
7081 } else {
7082 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
7083 ipseclog((LOG_DEBUG,
7084 "%s: invalid message: wrong header size.\n",
7085 __func__));
7086 return key_senderror(so, m, EINVAL);
7087 }
7088 mode = ((struct sadb_x_sa2 *)
7089 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
7090 reqid = ((struct sadb_x_sa2 *)
7091 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
7092 }
7093
7094 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
7095 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
7096
7097 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
7098 (struct sockaddr *)(dst0 + 1));
7099 if (error != 0) {
7100 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
7101 return key_senderror(so, m, EINVAL);
7102 }
7103 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
7104
7105 /* get a SA index */
7106 SAHTREE_RLOCK();
7107 LIST_FOREACH(sah, SAHADDRHASH_HASH(&saidx), addrhash) {
7108 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID))
7109 break;
7110 }
7111 SAHTREE_RUNLOCK();
7112 if (sah != NULL) {
7113 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__));
7114 return key_senderror(so, m, EEXIST);
7115 }
7116
7117 error = key_acquire(&saidx, NULL);
7118 if (error != 0) {
7119 ipseclog((LOG_DEBUG,
7120 "%s: error %d returned from key_acquire()\n",
7121 __func__, error));
7122 return key_senderror(so, m, error);
7123 }
7124 m_freem(m);
7125 return (0);
7126 }
7127
7128 /*
7129 * SADB_REGISTER processing.
7130 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported.
7131 * receive
7132 * <base>
7133 * from the ikmpd, and register a socket to send PF_KEY messages,
7134 * and send
7135 * <base, supported>
7136 * to KMD by PF_KEY.
7137 * If socket is detached, must free from regnode.
7138 *
7139 * m will always be freed.
7140 */
7141 static int
key_register(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7142 key_register(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7143 {
7144 struct secreg *reg, *newreg = NULL;
7145
7146 IPSEC_ASSERT(so != NULL, ("null socket"));
7147 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7148 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7149 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7150
7151 /* check for invalid register message */
7152 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0]))
7153 return key_senderror(so, m, EINVAL);
7154
7155 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */
7156 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC)
7157 goto setmsg;
7158
7159 /* check whether existing or not */
7160 REGTREE_LOCK();
7161 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) {
7162 if (reg->so == so) {
7163 REGTREE_UNLOCK();
7164 ipseclog((LOG_DEBUG, "%s: socket exists already.\n",
7165 __func__));
7166 return key_senderror(so, m, EEXIST);
7167 }
7168 }
7169
7170 /* create regnode */
7171 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO);
7172 if (newreg == NULL) {
7173 REGTREE_UNLOCK();
7174 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
7175 return key_senderror(so, m, ENOBUFS);
7176 }
7177
7178 newreg->so = so;
7179 ((struct keycb *)(so->so_pcb))->kp_registered++;
7180
7181 /* add regnode to regtree. */
7182 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain);
7183 REGTREE_UNLOCK();
7184
7185 setmsg:
7186 {
7187 struct mbuf *n;
7188 struct sadb_msg *newmsg;
7189 struct sadb_supported *sup;
7190 u_int len, alen, elen;
7191 int off;
7192 int i;
7193 struct sadb_alg *alg;
7194
7195 /* create new sadb_msg to reply. */
7196 alen = 0;
7197 for (i = 1; i <= SADB_AALG_MAX; i++) {
7198 if (auth_algorithm_lookup(i))
7199 alen += sizeof(struct sadb_alg);
7200 }
7201 if (alen)
7202 alen += sizeof(struct sadb_supported);
7203 elen = 0;
7204 for (i = 1; i <= SADB_EALG_MAX; i++) {
7205 if (enc_algorithm_lookup(i))
7206 elen += sizeof(struct sadb_alg);
7207 }
7208 if (elen)
7209 elen += sizeof(struct sadb_supported);
7210
7211 len = sizeof(struct sadb_msg) + alen + elen;
7212
7213 if (len > MCLBYTES)
7214 return key_senderror(so, m, ENOBUFS);
7215
7216 n = key_mget(len);
7217 if (n == NULL)
7218 return key_senderror(so, m, ENOBUFS);
7219
7220 n->m_pkthdr.len = n->m_len = len;
7221 n->m_next = NULL;
7222 off = 0;
7223
7224 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
7225 newmsg = mtod(n, struct sadb_msg *);
7226 newmsg->sadb_msg_errno = 0;
7227 newmsg->sadb_msg_len = PFKEY_UNIT64(len);
7228 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
7229
7230 /* for authentication algorithm */
7231 if (alen) {
7232 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
7233 sup->sadb_supported_len = PFKEY_UNIT64(alen);
7234 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
7235 off += PFKEY_ALIGN8(sizeof(*sup));
7236
7237 for (i = 1; i <= SADB_AALG_MAX; i++) {
7238 const struct auth_hash *aalgo;
7239 u_int16_t minkeysize, maxkeysize;
7240
7241 aalgo = auth_algorithm_lookup(i);
7242 if (!aalgo)
7243 continue;
7244 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
7245 alg->sadb_alg_id = i;
7246 alg->sadb_alg_ivlen = 0;
7247 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize);
7248 alg->sadb_alg_minbits = _BITS(minkeysize);
7249 alg->sadb_alg_maxbits = _BITS(maxkeysize);
7250 off += PFKEY_ALIGN8(sizeof(*alg));
7251 }
7252 }
7253
7254 /* for encryption algorithm */
7255 if (elen) {
7256 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
7257 sup->sadb_supported_len = PFKEY_UNIT64(elen);
7258 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
7259 off += PFKEY_ALIGN8(sizeof(*sup));
7260
7261 for (i = 1; i <= SADB_EALG_MAX; i++) {
7262 const struct enc_xform *ealgo;
7263
7264 ealgo = enc_algorithm_lookup(i);
7265 if (!ealgo)
7266 continue;
7267 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
7268 alg->sadb_alg_id = i;
7269 alg->sadb_alg_ivlen = ealgo->ivsize;
7270 alg->sadb_alg_minbits = _BITS(ealgo->minkey);
7271 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey);
7272 off += PFKEY_ALIGN8(sizeof(struct sadb_alg));
7273 }
7274 }
7275
7276 IPSEC_ASSERT(off == len,
7277 ("length assumption failed (off %u len %u)", off, len));
7278
7279 m_freem(m);
7280 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED);
7281 }
7282 }
7283
7284 /*
7285 * free secreg entry registered.
7286 * XXX: I want to do free a socket marked done SADB_RESIGER to socket.
7287 */
7288 void
key_freereg(struct socket * so)7289 key_freereg(struct socket *so)
7290 {
7291 struct secreg *reg;
7292 int i;
7293
7294 IPSEC_ASSERT(so != NULL, ("NULL so"));
7295
7296 /*
7297 * check whether existing or not.
7298 * check all type of SA, because there is a potential that
7299 * one socket is registered to multiple type of SA.
7300 */
7301 REGTREE_LOCK();
7302 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
7303 LIST_FOREACH(reg, &V_regtree[i], chain) {
7304 if (reg->so == so && __LIST_CHAINED(reg)) {
7305 LIST_REMOVE(reg, chain);
7306 free(reg, M_IPSEC_SAR);
7307 break;
7308 }
7309 }
7310 }
7311 REGTREE_UNLOCK();
7312 }
7313
7314 /*
7315 * SADB_EXPIRE processing
7316 * send
7317 * <base, SA, SA2, lifetime(C and one of HS), address(SD)>
7318 * to KMD by PF_KEY.
7319 * NOTE: We send only soft lifetime extension.
7320 *
7321 * OUT: 0 : succeed
7322 * others : error number
7323 */
7324 static int
key_expire(struct secasvar * sav,int hard)7325 key_expire(struct secasvar *sav, int hard)
7326 {
7327 struct mbuf *result = NULL, *m;
7328 struct sadb_lifetime *lt;
7329 uint32_t replay_count;
7330 int error, len;
7331 uint8_t satype;
7332
7333 SECASVAR_RLOCK_TRACKER;
7334
7335 IPSEC_ASSERT (sav != NULL, ("null sav"));
7336 IPSEC_ASSERT (sav->sah != NULL, ("null sa header"));
7337
7338 KEYDBG(KEY_STAMP,
7339 printf("%s: SA(%p) expired %s lifetime\n", __func__,
7340 sav, hard ? "hard": "soft"));
7341 KEYDBG(KEY_DATA, kdebug_secasv(sav));
7342 /* set msg header */
7343 satype = key_proto2satype(sav->sah->saidx.proto);
7344 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype));
7345 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt);
7346 if (!m) {
7347 error = ENOBUFS;
7348 goto fail;
7349 }
7350 result = m;
7351
7352 /* create SA extension */
7353 m = key_setsadbsa(sav);
7354 if (!m) {
7355 error = ENOBUFS;
7356 goto fail;
7357 }
7358 m_cat(result, m);
7359
7360 /* create SA extension */
7361 SECASVAR_RLOCK(sav);
7362 replay_count = sav->replay ? sav->replay->count : 0;
7363 SECASVAR_RUNLOCK(sav);
7364
7365 m = key_setsadbxsa2(sav->sah->saidx.mode, replay_count,
7366 sav->sah->saidx.reqid);
7367 if (!m) {
7368 error = ENOBUFS;
7369 goto fail;
7370 }
7371 m_cat(result, m);
7372
7373 if (sav->replay && sav->replay->wsize > UINT8_MAX) {
7374 m = key_setsadbxsareplay(sav->replay->wsize);
7375 if (!m) {
7376 error = ENOBUFS;
7377 goto fail;
7378 }
7379 m_cat(result, m);
7380 }
7381
7382 /* create lifetime extension (current and soft) */
7383 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
7384 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
7385 if (m == NULL) {
7386 error = ENOBUFS;
7387 goto fail;
7388 }
7389 m_align(m, len);
7390 m->m_len = len;
7391 bzero(mtod(m, caddr_t), len);
7392 lt = mtod(m, struct sadb_lifetime *);
7393 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
7394 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
7395 lt->sadb_lifetime_allocations =
7396 (uint32_t)counter_u64_fetch(sav->lft_c_allocations);
7397 lt->sadb_lifetime_bytes =
7398 counter_u64_fetch(sav->lft_c_bytes);
7399 lt->sadb_lifetime_addtime = sav->created;
7400 lt->sadb_lifetime_usetime = sav->firstused;
7401 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
7402 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
7403 if (hard) {
7404 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
7405 lt->sadb_lifetime_allocations = sav->lft_h->allocations;
7406 lt->sadb_lifetime_bytes = sav->lft_h->bytes;
7407 lt->sadb_lifetime_addtime = sav->lft_h->addtime;
7408 lt->sadb_lifetime_usetime = sav->lft_h->usetime;
7409 } else {
7410 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
7411 lt->sadb_lifetime_allocations = sav->lft_s->allocations;
7412 lt->sadb_lifetime_bytes = sav->lft_s->bytes;
7413 lt->sadb_lifetime_addtime = sav->lft_s->addtime;
7414 lt->sadb_lifetime_usetime = sav->lft_s->usetime;
7415 }
7416 m_cat(result, m);
7417
7418 /* set sadb_address for source */
7419 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
7420 &sav->sah->saidx.src.sa,
7421 FULLMASK, IPSEC_ULPROTO_ANY);
7422 if (!m) {
7423 error = ENOBUFS;
7424 goto fail;
7425 }
7426 m_cat(result, m);
7427
7428 /* set sadb_address for destination */
7429 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
7430 &sav->sah->saidx.dst.sa,
7431 FULLMASK, IPSEC_ULPROTO_ANY);
7432 if (!m) {
7433 error = ENOBUFS;
7434 goto fail;
7435 }
7436 m_cat(result, m);
7437
7438 /*
7439 * XXX-BZ Handle NAT-T extensions here.
7440 * XXXAE: it doesn't seem quite useful. IKEs should not depend on
7441 * this information, we report only significant SA fields.
7442 */
7443
7444 if ((result->m_flags & M_PKTHDR) == 0) {
7445 error = EINVAL;
7446 goto fail;
7447 }
7448
7449 if (result->m_len < sizeof(struct sadb_msg)) {
7450 result = m_pullup(result, sizeof(struct sadb_msg));
7451 if (result == NULL) {
7452 error = ENOBUFS;
7453 goto fail;
7454 }
7455 }
7456
7457 result->m_pkthdr.len = 0;
7458 for (m = result; m; m = m->m_next)
7459 result->m_pkthdr.len += m->m_len;
7460
7461 mtod(result, struct sadb_msg *)->sadb_msg_len =
7462 PFKEY_UNIT64(result->m_pkthdr.len);
7463
7464 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
7465
7466 fail:
7467 if (result)
7468 m_freem(result);
7469 return error;
7470 }
7471
7472 static void
key_freesah_flushed(struct secashead_queue * flushq)7473 key_freesah_flushed(struct secashead_queue *flushq)
7474 {
7475 struct secashead *sah, *nextsah;
7476 struct secasvar *sav, *nextsav;
7477
7478 sah = TAILQ_FIRST(flushq);
7479 while (sah != NULL) {
7480 sav = TAILQ_FIRST(&sah->savtree_larval);
7481 while (sav != NULL) {
7482 nextsav = TAILQ_NEXT(sav, chain);
7483 TAILQ_REMOVE(&sah->savtree_larval, sav, chain);
7484 key_freesav(&sav); /* release last reference */
7485 key_freesah(&sah); /* release reference from SAV */
7486 sav = nextsav;
7487 }
7488 sav = TAILQ_FIRST(&sah->savtree_alive);
7489 while (sav != NULL) {
7490 nextsav = TAILQ_NEXT(sav, chain);
7491 TAILQ_REMOVE(&sah->savtree_alive, sav, chain);
7492 key_freesav(&sav); /* release last reference */
7493 key_freesah(&sah); /* release reference from SAV */
7494 sav = nextsav;
7495 }
7496 nextsah = TAILQ_NEXT(sah, chain);
7497 key_freesah(&sah); /* release last reference */
7498 sah = nextsah;
7499 }
7500 }
7501
7502 /*
7503 * SADB_FLUSH processing
7504 * receive
7505 * <base>
7506 * from the ikmpd, and free all entries in secastree.
7507 * and send,
7508 * <base>
7509 * to the ikmpd.
7510 * NOTE: to do is only marking SADB_SASTATE_DEAD.
7511 *
7512 * m will always be freed.
7513 */
7514 static int
key_flush(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7515 key_flush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7516 {
7517 struct secashead_queue flushq;
7518 struct sadb_msg *newmsg;
7519 struct secashead *sah, *nextsah;
7520 struct secasvar *sav;
7521 uint8_t proto;
7522 int i;
7523
7524 IPSEC_ASSERT(so != NULL, ("null socket"));
7525 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7526 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7527
7528 /* map satype to proto */
7529 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7530 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7531 __func__));
7532 return key_senderror(so, m, EINVAL);
7533 }
7534 KEYDBG(KEY_STAMP,
7535 printf("%s: proto %u\n", __func__, proto));
7536
7537 TAILQ_INIT(&flushq);
7538 if (proto == IPSEC_PROTO_ANY) {
7539 /* no SATYPE specified, i.e. flushing all SA. */
7540 SAHTREE_WLOCK();
7541 /* Move all SAHs into flushq */
7542 TAILQ_CONCAT(&flushq, &V_sahtree, chain);
7543 /* Flush all buckets in SPI hash */
7544 for (i = 0; i < V_savhash_mask + 1; i++)
7545 LIST_INIT(&V_savhashtbl[i]);
7546 /* Flush all buckets in SAHADDRHASH */
7547 for (i = 0; i < V_sahaddrhash_mask + 1; i++)
7548 LIST_INIT(&V_sahaddrhashtbl[i]);
7549 /* Mark all SAHs as unlinked */
7550 TAILQ_FOREACH(sah, &flushq, chain) {
7551 sah->state = SADB_SASTATE_DEAD;
7552 /*
7553 * Callout handler makes its job using
7554 * RLOCK and drain queues. In case, when this
7555 * function will be called just before it
7556 * acquires WLOCK, we need to mark SAs as
7557 * unlinked to prevent second unlink.
7558 */
7559 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7560 sav->state = SADB_SASTATE_DEAD;
7561 }
7562 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7563 sav->state = SADB_SASTATE_DEAD;
7564 }
7565 }
7566 SAHTREE_WUNLOCK();
7567 } else {
7568 SAHTREE_WLOCK();
7569 sah = TAILQ_FIRST(&V_sahtree);
7570 while (sah != NULL) {
7571 IPSEC_ASSERT(sah->state != SADB_SASTATE_DEAD,
7572 ("DEAD SAH %p in SADB_FLUSH", sah));
7573 nextsah = TAILQ_NEXT(sah, chain);
7574 if (sah->saidx.proto != proto) {
7575 sah = nextsah;
7576 continue;
7577 }
7578 sah->state = SADB_SASTATE_DEAD;
7579 TAILQ_REMOVE(&V_sahtree, sah, chain);
7580 LIST_REMOVE(sah, addrhash);
7581 /* Unlink all SAs from SPI hash */
7582 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7583 LIST_REMOVE(sav, spihash);
7584 sav->state = SADB_SASTATE_DEAD;
7585 }
7586 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7587 LIST_REMOVE(sav, spihash);
7588 sav->state = SADB_SASTATE_DEAD;
7589 }
7590 /* Add SAH into flushq */
7591 TAILQ_INSERT_HEAD(&flushq, sah, chain);
7592 sah = nextsah;
7593 }
7594 SAHTREE_WUNLOCK();
7595 }
7596
7597 key_freesah_flushed(&flushq);
7598 /* Free all queued SAs and SAHs */
7599 if (m->m_len < sizeof(struct sadb_msg) ||
7600 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
7601 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
7602 return key_senderror(so, m, ENOBUFS);
7603 }
7604
7605 if (m->m_next)
7606 m_freem(m->m_next);
7607 m->m_next = NULL;
7608 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg);
7609 newmsg = mtod(m, struct sadb_msg *);
7610 newmsg->sadb_msg_errno = 0;
7611 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
7612
7613 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7614 }
7615
7616 /*
7617 * SADB_DUMP processing
7618 * dump all entries including status of DEAD in SAD.
7619 * receive
7620 * <base>
7621 * from the ikmpd, and dump all secasvar leaves
7622 * and send,
7623 * <base> .....
7624 * to the ikmpd.
7625 *
7626 * m will always be freed.
7627 */
7628 static int
key_dump(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7629 key_dump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7630 {
7631 SAHTREE_RLOCK_TRACKER;
7632 struct secashead *sah;
7633 struct secasvar *sav;
7634 struct mbuf *n;
7635 uint32_t cnt;
7636 uint8_t proto, satype;
7637
7638 IPSEC_ASSERT(so != NULL, ("null socket"));
7639 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7640 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7641 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7642
7643 /* map satype to proto */
7644 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7645 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7646 __func__));
7647 return key_senderror(so, m, EINVAL);
7648 }
7649
7650 /* count sav entries to be sent to the userland. */
7651 cnt = 0;
7652 SAHTREE_RLOCK();
7653 TAILQ_FOREACH(sah, &V_sahtree, chain) {
7654 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
7655 proto != sah->saidx.proto)
7656 continue;
7657
7658 TAILQ_FOREACH(sav, &sah->savtree_larval, chain)
7659 cnt++;
7660 TAILQ_FOREACH(sav, &sah->savtree_alive, chain)
7661 cnt++;
7662 }
7663
7664 if (cnt == 0) {
7665 SAHTREE_RUNLOCK();
7666 return key_senderror(so, m, ENOENT);
7667 }
7668
7669 /* send this to the userland, one at a time. */
7670 TAILQ_FOREACH(sah, &V_sahtree, chain) {
7671 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
7672 proto != sah->saidx.proto)
7673 continue;
7674
7675 /* map proto to satype */
7676 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
7677 SAHTREE_RUNLOCK();
7678 ipseclog((LOG_DEBUG, "%s: there was invalid proto in "
7679 "SAD.\n", __func__));
7680 return key_senderror(so, m, EINVAL);
7681 }
7682 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7683 n = key_setdumpsa(sav, SADB_DUMP, satype,
7684 --cnt, mhp->msg->sadb_msg_pid);
7685 if (n == NULL) {
7686 SAHTREE_RUNLOCK();
7687 return key_senderror(so, m, ENOBUFS);
7688 }
7689 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
7690 }
7691 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7692 n = key_setdumpsa(sav, SADB_DUMP, satype,
7693 --cnt, mhp->msg->sadb_msg_pid);
7694 if (n == NULL) {
7695 SAHTREE_RUNLOCK();
7696 return key_senderror(so, m, ENOBUFS);
7697 }
7698 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
7699 }
7700 }
7701 SAHTREE_RUNLOCK();
7702 m_freem(m);
7703 return (0);
7704 }
7705 /*
7706 * SADB_X_PROMISC processing
7707 *
7708 * m will always be freed.
7709 */
7710 static int
key_promisc(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7711 key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7712 {
7713 int olen;
7714
7715 IPSEC_ASSERT(so != NULL, ("null socket"));
7716 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7717 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7718 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7719
7720 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
7721
7722 if (olen < sizeof(struct sadb_msg)) {
7723 #if 1
7724 return key_senderror(so, m, EINVAL);
7725 #else
7726 m_freem(m);
7727 return 0;
7728 #endif
7729 } else if (olen == sizeof(struct sadb_msg)) {
7730 /* enable/disable promisc mode */
7731 struct keycb *kp;
7732
7733 if ((kp = so->so_pcb) == NULL)
7734 return key_senderror(so, m, EINVAL);
7735 mhp->msg->sadb_msg_errno = 0;
7736 switch (mhp->msg->sadb_msg_satype) {
7737 case 0:
7738 case 1:
7739 kp->kp_promisc = mhp->msg->sadb_msg_satype;
7740 break;
7741 default:
7742 return key_senderror(so, m, EINVAL);
7743 }
7744
7745 /* send the original message back to everyone */
7746 mhp->msg->sadb_msg_errno = 0;
7747 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7748 } else {
7749 /* send packet as is */
7750
7751 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg)));
7752
7753 /* TODO: if sadb_msg_seq is specified, send to specific pid */
7754 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7755 }
7756 }
7757
7758 static int (*key_typesw[])(struct socket *, struct mbuf *,
7759 const struct sadb_msghdr *) = {
7760 [SADB_RESERVED] = NULL,
7761 [SADB_GETSPI] = key_getspi,
7762 [SADB_UPDATE] = key_update,
7763 [SADB_ADD] = key_add,
7764 [SADB_DELETE] = key_delete,
7765 [SADB_GET] = key_get,
7766 [SADB_ACQUIRE] = key_acquire2,
7767 [SADB_REGISTER] = key_register,
7768 [SADB_EXPIRE] = NULL,
7769 [SADB_FLUSH] = key_flush,
7770 [SADB_DUMP] = key_dump,
7771 [SADB_X_PROMISC] = key_promisc,
7772 [SADB_X_PCHANGE] = NULL,
7773 [SADB_X_SPDUPDATE] = key_spdadd,
7774 [SADB_X_SPDADD] = key_spdadd,
7775 [SADB_X_SPDDELETE] = key_spddelete,
7776 [SADB_X_SPDGET] = key_spdget,
7777 [SADB_X_SPDACQUIRE] = NULL,
7778 [SADB_X_SPDDUMP] = key_spddump,
7779 [SADB_X_SPDFLUSH] = key_spdflush,
7780 [SADB_X_SPDSETIDX] = key_spdadd,
7781 [SADB_X_SPDEXPIRE] = NULL,
7782 [SADB_X_SPDDELETE2] = key_spddelete2,
7783 };
7784
7785 /*
7786 * parse sadb_msg buffer to process PFKEYv2,
7787 * and create a data to response if needed.
7788 * I think to be dealed with mbuf directly.
7789 * IN:
7790 * msgp : pointer to pointer to a received buffer pulluped.
7791 * This is rewrited to response.
7792 * so : pointer to socket.
7793 * OUT:
7794 * length for buffer to send to user process.
7795 */
7796 int
key_parse(struct mbuf * m,struct socket * so)7797 key_parse(struct mbuf *m, struct socket *so)
7798 {
7799 struct sadb_msg *msg;
7800 struct sadb_msghdr mh;
7801 u_int orglen;
7802 int error;
7803 int target;
7804
7805 IPSEC_ASSERT(so != NULL, ("null socket"));
7806 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7807
7808 if (m->m_len < sizeof(struct sadb_msg)) {
7809 m = m_pullup(m, sizeof(struct sadb_msg));
7810 if (!m)
7811 return ENOBUFS;
7812 }
7813 msg = mtod(m, struct sadb_msg *);
7814 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len);
7815 target = KEY_SENDUP_ONE;
7816
7817 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len != orglen) {
7818 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__));
7819 PFKEYSTAT_INC(out_invlen);
7820 error = EINVAL;
7821 goto senderror;
7822 }
7823
7824 if (msg->sadb_msg_version != PF_KEY_V2) {
7825 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n",
7826 __func__, msg->sadb_msg_version));
7827 PFKEYSTAT_INC(out_invver);
7828 error = EINVAL;
7829 goto senderror;
7830 }
7831
7832 if (msg->sadb_msg_type > SADB_MAX) {
7833 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
7834 __func__, msg->sadb_msg_type));
7835 PFKEYSTAT_INC(out_invmsgtype);
7836 error = EINVAL;
7837 goto senderror;
7838 }
7839
7840 /* for old-fashioned code - should be nuked */
7841 if (m->m_pkthdr.len > MCLBYTES) {
7842 m_freem(m);
7843 return ENOBUFS;
7844 }
7845 if (m->m_next) {
7846 struct mbuf *n;
7847
7848 n = key_mget(m->m_pkthdr.len);
7849 if (n == NULL) {
7850 m_freem(m);
7851 return ENOBUFS;
7852 }
7853 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
7854 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len;
7855 n->m_next = NULL;
7856 m_freem(m);
7857 m = n;
7858 }
7859
7860 /* align the mbuf chain so that extensions are in contiguous region. */
7861 error = key_align(m, &mh);
7862 if (error)
7863 return error;
7864
7865 msg = mh.msg;
7866
7867 /* We use satype as scope mask for spddump */
7868 if (msg->sadb_msg_type == SADB_X_SPDDUMP) {
7869 switch (msg->sadb_msg_satype) {
7870 case IPSEC_POLICYSCOPE_ANY:
7871 case IPSEC_POLICYSCOPE_GLOBAL:
7872 case IPSEC_POLICYSCOPE_IFNET:
7873 case IPSEC_POLICYSCOPE_PCB:
7874 break;
7875 default:
7876 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
7877 __func__, msg->sadb_msg_type));
7878 PFKEYSTAT_INC(out_invsatype);
7879 error = EINVAL;
7880 goto senderror;
7881 }
7882 } else {
7883 switch (msg->sadb_msg_satype) { /* check SA type */
7884 case SADB_SATYPE_UNSPEC:
7885 switch (msg->sadb_msg_type) {
7886 case SADB_GETSPI:
7887 case SADB_UPDATE:
7888 case SADB_ADD:
7889 case SADB_DELETE:
7890 case SADB_GET:
7891 case SADB_ACQUIRE:
7892 case SADB_EXPIRE:
7893 ipseclog((LOG_DEBUG, "%s: must specify satype "
7894 "when msg type=%u.\n", __func__,
7895 msg->sadb_msg_type));
7896 PFKEYSTAT_INC(out_invsatype);
7897 error = EINVAL;
7898 goto senderror;
7899 }
7900 break;
7901 case SADB_SATYPE_AH:
7902 case SADB_SATYPE_ESP:
7903 case SADB_X_SATYPE_IPCOMP:
7904 case SADB_X_SATYPE_TCPSIGNATURE:
7905 switch (msg->sadb_msg_type) {
7906 case SADB_X_SPDADD:
7907 case SADB_X_SPDDELETE:
7908 case SADB_X_SPDGET:
7909 case SADB_X_SPDFLUSH:
7910 case SADB_X_SPDSETIDX:
7911 case SADB_X_SPDUPDATE:
7912 case SADB_X_SPDDELETE2:
7913 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
7914 __func__, msg->sadb_msg_type));
7915 PFKEYSTAT_INC(out_invsatype);
7916 error = EINVAL;
7917 goto senderror;
7918 }
7919 break;
7920 case SADB_SATYPE_RSVP:
7921 case SADB_SATYPE_OSPFV2:
7922 case SADB_SATYPE_RIPV2:
7923 case SADB_SATYPE_MIP:
7924 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n",
7925 __func__, msg->sadb_msg_satype));
7926 PFKEYSTAT_INC(out_invsatype);
7927 error = EOPNOTSUPP;
7928 goto senderror;
7929 case 1: /* XXX: What does it do? */
7930 if (msg->sadb_msg_type == SADB_X_PROMISC)
7931 break;
7932 /*FALLTHROUGH*/
7933 default:
7934 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
7935 __func__, msg->sadb_msg_satype));
7936 PFKEYSTAT_INC(out_invsatype);
7937 error = EINVAL;
7938 goto senderror;
7939 }
7940 }
7941
7942 /* check field of upper layer protocol and address family */
7943 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL
7944 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) {
7945 struct sadb_address *src0, *dst0;
7946 u_int plen;
7947
7948 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]);
7949 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]);
7950
7951 /* check upper layer protocol */
7952 if (src0->sadb_address_proto != dst0->sadb_address_proto) {
7953 ipseclog((LOG_DEBUG, "%s: upper layer protocol "
7954 "mismatched.\n", __func__));
7955 PFKEYSTAT_INC(out_invaddr);
7956 error = EINVAL;
7957 goto senderror;
7958 }
7959
7960 /* check family */
7961 if (PFKEY_ADDR_SADDR(src0)->sa_family !=
7962 PFKEY_ADDR_SADDR(dst0)->sa_family) {
7963 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n",
7964 __func__));
7965 PFKEYSTAT_INC(out_invaddr);
7966 error = EINVAL;
7967 goto senderror;
7968 }
7969 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
7970 PFKEY_ADDR_SADDR(dst0)->sa_len) {
7971 ipseclog((LOG_DEBUG, "%s: address struct size "
7972 "mismatched.\n", __func__));
7973 PFKEYSTAT_INC(out_invaddr);
7974 error = EINVAL;
7975 goto senderror;
7976 }
7977
7978 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
7979 case AF_INET:
7980 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
7981 sizeof(struct sockaddr_in)) {
7982 PFKEYSTAT_INC(out_invaddr);
7983 error = EINVAL;
7984 goto senderror;
7985 }
7986 break;
7987 case AF_INET6:
7988 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
7989 sizeof(struct sockaddr_in6)) {
7990 PFKEYSTAT_INC(out_invaddr);
7991 error = EINVAL;
7992 goto senderror;
7993 }
7994 break;
7995 default:
7996 ipseclog((LOG_DEBUG, "%s: unsupported address family\n",
7997 __func__));
7998 PFKEYSTAT_INC(out_invaddr);
7999 error = EAFNOSUPPORT;
8000 goto senderror;
8001 }
8002
8003 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
8004 case AF_INET:
8005 plen = sizeof(struct in_addr) << 3;
8006 break;
8007 case AF_INET6:
8008 plen = sizeof(struct in6_addr) << 3;
8009 break;
8010 default:
8011 plen = 0; /*fool gcc*/
8012 break;
8013 }
8014
8015 /* check max prefix length */
8016 if (src0->sadb_address_prefixlen > plen ||
8017 dst0->sadb_address_prefixlen > plen) {
8018 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n",
8019 __func__));
8020 PFKEYSTAT_INC(out_invaddr);
8021 error = EINVAL;
8022 goto senderror;
8023 }
8024
8025 /*
8026 * prefixlen == 0 is valid because there can be a case when
8027 * all addresses are matched.
8028 */
8029 }
8030
8031 if (msg->sadb_msg_type >= nitems(key_typesw) ||
8032 key_typesw[msg->sadb_msg_type] == NULL) {
8033 PFKEYSTAT_INC(out_invmsgtype);
8034 error = EINVAL;
8035 goto senderror;
8036 }
8037
8038 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh);
8039
8040 senderror:
8041 msg->sadb_msg_errno = error;
8042 return key_sendup_mbuf(so, m, target);
8043 }
8044
8045 static int
key_senderror(struct socket * so,struct mbuf * m,int code)8046 key_senderror(struct socket *so, struct mbuf *m, int code)
8047 {
8048 struct sadb_msg *msg;
8049
8050 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
8051 ("mbuf too small, len %u", m->m_len));
8052
8053 msg = mtod(m, struct sadb_msg *);
8054 msg->sadb_msg_errno = code;
8055 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
8056 }
8057
8058 /*
8059 * set the pointer to each header into message buffer.
8060 * m will be freed on error.
8061 * XXX larger-than-MCLBYTES extension?
8062 */
8063 static int
key_align(struct mbuf * m,struct sadb_msghdr * mhp)8064 key_align(struct mbuf *m, struct sadb_msghdr *mhp)
8065 {
8066 struct mbuf *n;
8067 struct sadb_ext *ext;
8068 size_t off, end;
8069 int extlen;
8070 int toff;
8071
8072 IPSEC_ASSERT(m != NULL, ("null mbuf"));
8073 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
8074 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
8075 ("mbuf too small, len %u", m->m_len));
8076
8077 /* initialize */
8078 bzero(mhp, sizeof(*mhp));
8079
8080 mhp->msg = mtod(m, struct sadb_msg *);
8081 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */
8082
8083 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
8084 extlen = end; /*just in case extlen is not updated*/
8085 for (off = sizeof(struct sadb_msg); off < end; off += extlen) {
8086 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff);
8087 if (!n) {
8088 /* m is already freed */
8089 return ENOBUFS;
8090 }
8091 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
8092
8093 /* set pointer */
8094 switch (ext->sadb_ext_type) {
8095 case SADB_EXT_SA:
8096 case SADB_EXT_ADDRESS_SRC:
8097 case SADB_EXT_ADDRESS_DST:
8098 case SADB_EXT_ADDRESS_PROXY:
8099 case SADB_EXT_LIFETIME_CURRENT:
8100 case SADB_EXT_LIFETIME_HARD:
8101 case SADB_EXT_LIFETIME_SOFT:
8102 case SADB_EXT_KEY_AUTH:
8103 case SADB_EXT_KEY_ENCRYPT:
8104 case SADB_EXT_IDENTITY_SRC:
8105 case SADB_EXT_IDENTITY_DST:
8106 case SADB_EXT_SENSITIVITY:
8107 case SADB_EXT_PROPOSAL:
8108 case SADB_EXT_SUPPORTED_AUTH:
8109 case SADB_EXT_SUPPORTED_ENCRYPT:
8110 case SADB_EXT_SPIRANGE:
8111 case SADB_X_EXT_POLICY:
8112 case SADB_X_EXT_SA2:
8113 case SADB_X_EXT_NAT_T_TYPE:
8114 case SADB_X_EXT_NAT_T_SPORT:
8115 case SADB_X_EXT_NAT_T_DPORT:
8116 case SADB_X_EXT_NAT_T_OAI:
8117 case SADB_X_EXT_NAT_T_OAR:
8118 case SADB_X_EXT_NAT_T_FRAG:
8119 case SADB_X_EXT_SA_REPLAY:
8120 case SADB_X_EXT_NEW_ADDRESS_SRC:
8121 case SADB_X_EXT_NEW_ADDRESS_DST:
8122 /* duplicate check */
8123 /*
8124 * XXX Are there duplication payloads of either
8125 * KEY_AUTH or KEY_ENCRYPT ?
8126 */
8127 if (mhp->ext[ext->sadb_ext_type] != NULL) {
8128 ipseclog((LOG_DEBUG, "%s: duplicate ext_type "
8129 "%u\n", __func__, ext->sadb_ext_type));
8130 m_freem(m);
8131 PFKEYSTAT_INC(out_dupext);
8132 return EINVAL;
8133 }
8134 break;
8135 default:
8136 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n",
8137 __func__, ext->sadb_ext_type));
8138 m_freem(m);
8139 PFKEYSTAT_INC(out_invexttype);
8140 return EINVAL;
8141 }
8142
8143 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
8144
8145 if (key_validate_ext(ext, extlen)) {
8146 m_freem(m);
8147 PFKEYSTAT_INC(out_invlen);
8148 return EINVAL;
8149 }
8150
8151 n = m_pulldown(m, off, extlen, &toff);
8152 if (!n) {
8153 /* m is already freed */
8154 return ENOBUFS;
8155 }
8156 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
8157
8158 mhp->ext[ext->sadb_ext_type] = ext;
8159 mhp->extoff[ext->sadb_ext_type] = off;
8160 mhp->extlen[ext->sadb_ext_type] = extlen;
8161 }
8162
8163 if (off != end) {
8164 m_freem(m);
8165 PFKEYSTAT_INC(out_invlen);
8166 return EINVAL;
8167 }
8168
8169 return 0;
8170 }
8171
8172 static int
key_validate_ext(const struct sadb_ext * ext,int len)8173 key_validate_ext(const struct sadb_ext *ext, int len)
8174 {
8175 const struct sockaddr *sa;
8176 enum { NONE, ADDR } checktype = NONE;
8177 int baselen = 0;
8178 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len);
8179
8180 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len))
8181 return EINVAL;
8182
8183 /* if it does not match minimum/maximum length, bail */
8184 if (ext->sadb_ext_type >= nitems(minsize) ||
8185 ext->sadb_ext_type >= nitems(maxsize))
8186 return EINVAL;
8187 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type])
8188 return EINVAL;
8189 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type])
8190 return EINVAL;
8191
8192 /* more checks based on sadb_ext_type XXX need more */
8193 switch (ext->sadb_ext_type) {
8194 case SADB_EXT_ADDRESS_SRC:
8195 case SADB_EXT_ADDRESS_DST:
8196 case SADB_EXT_ADDRESS_PROXY:
8197 case SADB_X_EXT_NAT_T_OAI:
8198 case SADB_X_EXT_NAT_T_OAR:
8199 case SADB_X_EXT_NEW_ADDRESS_SRC:
8200 case SADB_X_EXT_NEW_ADDRESS_DST:
8201 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
8202 checktype = ADDR;
8203 break;
8204 case SADB_EXT_IDENTITY_SRC:
8205 case SADB_EXT_IDENTITY_DST:
8206 if (((const struct sadb_ident *)ext)->sadb_ident_type ==
8207 SADB_X_IDENTTYPE_ADDR) {
8208 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident));
8209 checktype = ADDR;
8210 } else
8211 checktype = NONE;
8212 break;
8213 default:
8214 checktype = NONE;
8215 break;
8216 }
8217
8218 switch (checktype) {
8219 case NONE:
8220 break;
8221 case ADDR:
8222 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen);
8223 if (len < baselen + sal)
8224 return EINVAL;
8225 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len)
8226 return EINVAL;
8227 break;
8228 }
8229
8230 return 0;
8231 }
8232
8233 void
spdcache_init(void)8234 spdcache_init(void)
8235 {
8236 int i;
8237
8238 TUNABLE_INT_FETCH("net.key.spdcache.maxentries",
8239 &V_key_spdcache_maxentries);
8240 TUNABLE_INT_FETCH("net.key.spdcache.threshold",
8241 &V_key_spdcache_threshold);
8242
8243 if (V_key_spdcache_maxentries) {
8244 V_key_spdcache_maxentries = MAX(V_key_spdcache_maxentries,
8245 SPDCACHE_MAX_ENTRIES_PER_HASH);
8246 V_spdcachehashtbl = hashinit(V_key_spdcache_maxentries /
8247 SPDCACHE_MAX_ENTRIES_PER_HASH,
8248 M_IPSEC_SPDCACHE, &V_spdcachehash_mask);
8249 V_key_spdcache_maxentries = (V_spdcachehash_mask + 1)
8250 * SPDCACHE_MAX_ENTRIES_PER_HASH;
8251
8252 V_spdcache_lock = malloc(sizeof(struct mtx) *
8253 (V_spdcachehash_mask + 1),
8254 M_IPSEC_SPDCACHE, M_WAITOK | M_ZERO);
8255
8256 for (i = 0; i < V_spdcachehash_mask + 1; ++i)
8257 SPDCACHE_LOCK_INIT(i);
8258 }
8259 }
8260
8261 struct spdcache_entry *
spdcache_entry_alloc(const struct secpolicyindex * spidx,struct secpolicy * sp)8262 spdcache_entry_alloc(const struct secpolicyindex *spidx, struct secpolicy *sp)
8263 {
8264 struct spdcache_entry *entry;
8265
8266 entry = malloc(sizeof(struct spdcache_entry), M_IPSEC_SPDCACHE,
8267 M_NOWAIT | M_ZERO);
8268 if (entry == NULL)
8269 return (NULL);
8270
8271 if (sp != NULL)
8272 SP_ADDREF(sp);
8273
8274 entry->spidx = *spidx;
8275 entry->sp = sp;
8276
8277 return (entry);
8278 }
8279
8280 void
spdcache_entry_free(struct spdcache_entry * entry)8281 spdcache_entry_free(struct spdcache_entry *entry)
8282 {
8283
8284 if (entry->sp != NULL)
8285 key_freesp(&entry->sp);
8286 free(entry, M_IPSEC_SPDCACHE);
8287 }
8288
8289 void
spdcache_clear(void)8290 spdcache_clear(void)
8291 {
8292 struct spdcache_entry *entry;
8293 int i;
8294
8295 for (i = 0; i < V_spdcachehash_mask + 1; ++i) {
8296 SPDCACHE_LOCK(i);
8297 while (!LIST_EMPTY(&V_spdcachehashtbl[i])) {
8298 entry = LIST_FIRST(&V_spdcachehashtbl[i]);
8299 LIST_REMOVE(entry, chain);
8300 spdcache_entry_free(entry);
8301 }
8302 SPDCACHE_UNLOCK(i);
8303 }
8304 }
8305
8306 #ifdef VIMAGE
8307 void
spdcache_destroy(void)8308 spdcache_destroy(void)
8309 {
8310 int i;
8311
8312 if (SPDCACHE_ENABLED()) {
8313 spdcache_clear();
8314 hashdestroy(V_spdcachehashtbl, M_IPSEC_SPDCACHE, V_spdcachehash_mask);
8315
8316 for (i = 0; i < V_spdcachehash_mask + 1; ++i)
8317 SPDCACHE_LOCK_DESTROY(i);
8318
8319 free(V_spdcache_lock, M_IPSEC_SPDCACHE);
8320 }
8321 }
8322 #endif
8323
8324 static void
key_vnet_init(void * arg __unused)8325 key_vnet_init(void *arg __unused)
8326 {
8327 int i;
8328
8329 for (i = 0; i < IPSEC_DIR_MAX; i++) {
8330 TAILQ_INIT(&V_sptree[i]);
8331 TAILQ_INIT(&V_sptree_ifnet[i]);
8332 }
8333
8334 TAILQ_INIT(&V_sahtree);
8335 V_sphashtbl = hashinit(SPHASH_NHASH, M_IPSEC_SP, &V_sphash_mask);
8336 V_savhashtbl = hashinit(SAVHASH_NHASH, M_IPSEC_SA, &V_savhash_mask);
8337 V_sahaddrhashtbl = hashinit(SAHHASH_NHASH, M_IPSEC_SAH,
8338 &V_sahaddrhash_mask);
8339 V_acqaddrhashtbl = hashinit(ACQHASH_NHASH, M_IPSEC_SAQ,
8340 &V_acqaddrhash_mask);
8341 V_acqseqhashtbl = hashinit(ACQHASH_NHASH, M_IPSEC_SAQ,
8342 &V_acqseqhash_mask);
8343
8344 spdcache_init();
8345
8346 for (i = 0; i <= SADB_SATYPE_MAX; i++)
8347 LIST_INIT(&V_regtree[i]);
8348
8349 LIST_INIT(&V_acqtree);
8350 LIST_INIT(&V_spacqtree);
8351 }
8352 VNET_SYSINIT(key_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_SECOND,
8353 key_vnet_init, NULL);
8354
8355 static void
key_init(void * arg __unused)8356 key_init(void *arg __unused)
8357 {
8358
8359 ipsec_key_lft_zone = uma_zcreate("IPsec SA lft_c",
8360 sizeof(uint64_t) * 2, NULL, NULL, NULL, NULL,
8361 UMA_ALIGN_PTR, UMA_ZONE_PCPU);
8362
8363 SPTREE_LOCK_INIT();
8364 REGTREE_LOCK_INIT();
8365 SAHTREE_LOCK_INIT();
8366 ACQ_LOCK_INIT();
8367 SPACQ_LOCK_INIT();
8368 SPI_ALLOC_LOCK_INIT();
8369
8370 #ifndef IPSEC_DEBUG2
8371 callout_init(&key_timer, 1);
8372 callout_reset(&key_timer, hz, key_timehandler, NULL);
8373 #endif /*IPSEC_DEBUG2*/
8374
8375 /* initialize key statistics */
8376 keystat.getspi_count = 1;
8377
8378 if (bootverbose)
8379 printf("IPsec: Initialized Security Association Processing.\n");
8380 }
8381 SYSINIT(key_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, key_init, NULL);
8382
8383 #ifdef VIMAGE
8384 static void
key_vnet_destroy(void * arg __unused)8385 key_vnet_destroy(void *arg __unused)
8386 {
8387 struct secashead_queue sahdrainq;
8388 struct secpolicy_queue drainq;
8389 struct secpolicy *sp, *nextsp;
8390 struct secacq *acq, *nextacq;
8391 struct secspacq *spacq, *nextspacq;
8392 struct secashead *sah;
8393 struct secasvar *sav;
8394 struct secreg *reg;
8395 int i;
8396
8397 /*
8398 * XXX: can we just call free() for each object without
8399 * walking through safe way with releasing references?
8400 */
8401 TAILQ_INIT(&drainq);
8402 SPTREE_WLOCK();
8403 for (i = 0; i < IPSEC_DIR_MAX; i++) {
8404 TAILQ_CONCAT(&drainq, &V_sptree[i], chain);
8405 TAILQ_CONCAT(&drainq, &V_sptree_ifnet[i], chain);
8406 }
8407 for (i = 0; i < V_sphash_mask + 1; i++)
8408 LIST_INIT(&V_sphashtbl[i]);
8409 SPTREE_WUNLOCK();
8410 spdcache_destroy();
8411
8412 sp = TAILQ_FIRST(&drainq);
8413 while (sp != NULL) {
8414 nextsp = TAILQ_NEXT(sp, chain);
8415 key_freesp(&sp);
8416 sp = nextsp;
8417 }
8418
8419 TAILQ_INIT(&sahdrainq);
8420 SAHTREE_WLOCK();
8421 TAILQ_CONCAT(&sahdrainq, &V_sahtree, chain);
8422 for (i = 0; i < V_savhash_mask + 1; i++)
8423 LIST_INIT(&V_savhashtbl[i]);
8424 for (i = 0; i < V_sahaddrhash_mask + 1; i++)
8425 LIST_INIT(&V_sahaddrhashtbl[i]);
8426 TAILQ_FOREACH(sah, &sahdrainq, chain) {
8427 sah->state = SADB_SASTATE_DEAD;
8428 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
8429 sav->state = SADB_SASTATE_DEAD;
8430 }
8431 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
8432 sav->state = SADB_SASTATE_DEAD;
8433 }
8434 }
8435 SAHTREE_WUNLOCK();
8436
8437 key_freesah_flushed(&sahdrainq);
8438 hashdestroy(V_sphashtbl, M_IPSEC_SP, V_sphash_mask);
8439 hashdestroy(V_savhashtbl, M_IPSEC_SA, V_savhash_mask);
8440 hashdestroy(V_sahaddrhashtbl, M_IPSEC_SAH, V_sahaddrhash_mask);
8441
8442 REGTREE_LOCK();
8443 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
8444 LIST_FOREACH(reg, &V_regtree[i], chain) {
8445 if (__LIST_CHAINED(reg)) {
8446 LIST_REMOVE(reg, chain);
8447 free(reg, M_IPSEC_SAR);
8448 break;
8449 }
8450 }
8451 }
8452 REGTREE_UNLOCK();
8453
8454 ACQ_LOCK();
8455 acq = LIST_FIRST(&V_acqtree);
8456 while (acq != NULL) {
8457 nextacq = LIST_NEXT(acq, chain);
8458 LIST_REMOVE(acq, chain);
8459 free(acq, M_IPSEC_SAQ);
8460 acq = nextacq;
8461 }
8462 for (i = 0; i < V_acqaddrhash_mask + 1; i++)
8463 LIST_INIT(&V_acqaddrhashtbl[i]);
8464 for (i = 0; i < V_acqseqhash_mask + 1; i++)
8465 LIST_INIT(&V_acqseqhashtbl[i]);
8466 ACQ_UNLOCK();
8467
8468 SPACQ_LOCK();
8469 for (spacq = LIST_FIRST(&V_spacqtree); spacq != NULL;
8470 spacq = nextspacq) {
8471 nextspacq = LIST_NEXT(spacq, chain);
8472 if (__LIST_CHAINED(spacq)) {
8473 LIST_REMOVE(spacq, chain);
8474 free(spacq, M_IPSEC_SAQ);
8475 }
8476 }
8477 SPACQ_UNLOCK();
8478 hashdestroy(V_acqaddrhashtbl, M_IPSEC_SAQ, V_acqaddrhash_mask);
8479 hashdestroy(V_acqseqhashtbl, M_IPSEC_SAQ, V_acqseqhash_mask);
8480 }
8481 VNET_SYSUNINIT(key_vnet_destroy, SI_SUB_PROTO_DOMAIN, SI_ORDER_SECOND,
8482 key_vnet_destroy, NULL);
8483 #endif
8484
8485 /*
8486 * XXX: as long as domains are not unloadable, this function is never called,
8487 * provided for consistensy and future unload support.
8488 */
8489 static void
key_destroy(void * arg __unused)8490 key_destroy(void *arg __unused)
8491 {
8492 uma_zdestroy(ipsec_key_lft_zone);
8493
8494 #ifndef IPSEC_DEBUG2
8495 callout_drain(&key_timer);
8496 #endif
8497 SPTREE_LOCK_DESTROY();
8498 REGTREE_LOCK_DESTROY();
8499 SAHTREE_LOCK_DESTROY();
8500 ACQ_LOCK_DESTROY();
8501 SPACQ_LOCK_DESTROY();
8502 SPI_ALLOC_LOCK_DESTROY();
8503 }
8504 SYSUNINIT(key_destroy, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, key_destroy, NULL);
8505
8506 /* record data transfer on SA, and update timestamps */
8507 void
key_sa_recordxfer(struct secasvar * sav,struct mbuf * m)8508 key_sa_recordxfer(struct secasvar *sav, struct mbuf *m)
8509 {
8510 IPSEC_ASSERT(sav != NULL, ("Null secasvar"));
8511 IPSEC_ASSERT(m != NULL, ("Null mbuf"));
8512
8513 /*
8514 * XXX Currently, there is a difference of bytes size
8515 * between inbound and outbound processing.
8516 */
8517 counter_u64_add(sav->lft_c_bytes, m->m_pkthdr.len);
8518
8519 /*
8520 * We use the number of packets as the unit of
8521 * allocations. We increment the variable
8522 * whenever {esp,ah}_{in,out}put is called.
8523 */
8524 counter_u64_add(sav->lft_c_allocations, 1);
8525
8526 /*
8527 * NOTE: We record CURRENT usetime by using wall clock,
8528 * in seconds. HARD and SOFT lifetime are measured by the time
8529 * difference (again in seconds) from usetime.
8530 *
8531 * usetime
8532 * v expire expire
8533 * -----+-----+--------+---> t
8534 * <--------------> HARD
8535 * <-----> SOFT
8536 */
8537 if (sav->firstused == 0)
8538 sav->firstused = time_second;
8539 }
8540
8541 /*
8542 * Take one of the kernel's security keys and convert it into a PF_KEY
8543 * structure within an mbuf, suitable for sending up to a waiting
8544 * application in user land.
8545 *
8546 * IN:
8547 * src: A pointer to a kernel security key.
8548 * exttype: Which type of key this is. Refer to the PF_KEY data structures.
8549 * OUT:
8550 * a valid mbuf or NULL indicating an error
8551 *
8552 */
8553
8554 static struct mbuf *
key_setkey(struct seckey * src,uint16_t exttype)8555 key_setkey(struct seckey *src, uint16_t exttype)
8556 {
8557 struct mbuf *m;
8558 struct sadb_key *p;
8559 int len;
8560
8561 if (src == NULL)
8562 return NULL;
8563
8564 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src));
8565 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
8566 if (m == NULL)
8567 return NULL;
8568 m_align(m, len);
8569 m->m_len = len;
8570 p = mtod(m, struct sadb_key *);
8571 bzero(p, len);
8572 p->sadb_key_len = PFKEY_UNIT64(len);
8573 p->sadb_key_exttype = exttype;
8574 p->sadb_key_bits = src->bits;
8575 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src));
8576
8577 return m;
8578 }
8579
8580 /*
8581 * Take one of the kernel's lifetime data structures and convert it
8582 * into a PF_KEY structure within an mbuf, suitable for sending up to
8583 * a waiting application in user land.
8584 *
8585 * IN:
8586 * src: A pointer to a kernel lifetime structure.
8587 * exttype: Which type of lifetime this is. Refer to the PF_KEY
8588 * data structures for more information.
8589 * OUT:
8590 * a valid mbuf or NULL indicating an error
8591 *
8592 */
8593
8594 static struct mbuf *
key_setlifetime(struct seclifetime * src,uint16_t exttype)8595 key_setlifetime(struct seclifetime *src, uint16_t exttype)
8596 {
8597 struct mbuf *m = NULL;
8598 struct sadb_lifetime *p;
8599 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime));
8600
8601 if (src == NULL)
8602 return NULL;
8603
8604 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
8605 if (m == NULL)
8606 return m;
8607 m_align(m, len);
8608 m->m_len = len;
8609 p = mtod(m, struct sadb_lifetime *);
8610
8611 bzero(p, len);
8612 p->sadb_lifetime_len = PFKEY_UNIT64(len);
8613 p->sadb_lifetime_exttype = exttype;
8614 p->sadb_lifetime_allocations = src->allocations;
8615 p->sadb_lifetime_bytes = src->bytes;
8616 p->sadb_lifetime_addtime = src->addtime;
8617 p->sadb_lifetime_usetime = src->usetime;
8618
8619 return m;
8620
8621 }
8622
8623 const struct enc_xform *
enc_algorithm_lookup(int alg)8624 enc_algorithm_lookup(int alg)
8625 {
8626 int i;
8627
8628 for (i = 0; i < nitems(supported_ealgs); i++)
8629 if (alg == supported_ealgs[i].sadb_alg)
8630 return (supported_ealgs[i].xform);
8631 return (NULL);
8632 }
8633
8634 const struct auth_hash *
auth_algorithm_lookup(int alg)8635 auth_algorithm_lookup(int alg)
8636 {
8637 int i;
8638
8639 for (i = 0; i < nitems(supported_aalgs); i++)
8640 if (alg == supported_aalgs[i].sadb_alg)
8641 return (supported_aalgs[i].xform);
8642 return (NULL);
8643 }
8644
8645 const struct comp_algo *
comp_algorithm_lookup(int alg)8646 comp_algorithm_lookup(int alg)
8647 {
8648 int i;
8649
8650 for (i = 0; i < nitems(supported_calgs); i++)
8651 if (alg == supported_calgs[i].sadb_alg)
8652 return (supported_calgs[i].xform);
8653 return (NULL);
8654 }
8655