1 /* $FreeBSD: stable/12/sys/netipsec/key.c 372345 2022-07-29 18:50:55Z dim $ */
2 /* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */
3
4 /*-
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the project nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 /*
36 * This code is referd to RFC 2367
37 */
38
39 #include "opt_inet.h"
40 #include "opt_inet6.h"
41 #include "opt_ipsec.h"
42
43 #include <sys/types.h>
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/fnv_hash.h>
48 #include <sys/lock.h>
49 #include <sys/mutex.h>
50 #include <sys/mbuf.h>
51 #include <sys/domain.h>
52 #include <sys/protosw.h>
53 #include <sys/malloc.h>
54 #include <sys/rmlock.h>
55 #include <sys/socket.h>
56 #include <sys/socketvar.h>
57 #include <sys/sysctl.h>
58 #include <sys/errno.h>
59 #include <sys/proc.h>
60 #include <sys/queue.h>
61 #include <sys/refcount.h>
62 #include <sys/syslog.h>
63
64 #include <vm/uma.h>
65
66 #include <net/if.h>
67 #include <net/if_var.h>
68 #include <net/vnet.h>
69 #include <net/raw_cb.h>
70
71 #include <netinet/in.h>
72 #include <netinet/in_systm.h>
73 #include <netinet/ip.h>
74 #include <netinet/in_var.h>
75 #include <netinet/udp.h>
76
77 #ifdef INET6
78 #include <netinet/ip6.h>
79 #include <netinet6/in6_var.h>
80 #include <netinet6/ip6_var.h>
81 #endif /* INET6 */
82
83 #include <net/pfkeyv2.h>
84 #include <netipsec/keydb.h>
85 #include <netipsec/key.h>
86 #include <netipsec/keysock.h>
87 #include <netipsec/key_debug.h>
88
89 #include <netipsec/ipsec.h>
90 #ifdef INET6
91 #include <netipsec/ipsec6.h>
92 #endif
93
94 #include <netipsec/xform.h>
95 #include <machine/in_cksum.h>
96 #include <machine/stdarg.h>
97
98 /* randomness */
99 #include <sys/random.h>
100
101 #define FULLMASK 0xff
102 #define _BITS(bytes) ((bytes) << 3)
103
104 /*
105 * Note on SA reference counting:
106 * - SAs that are not in DEAD state will have (total external reference + 1)
107 * following value in reference count field. they cannot be freed and are
108 * referenced from SA header.
109 * - SAs that are in DEAD state will have (total external reference)
110 * in reference count field. they are ready to be freed. reference from
111 * SA header will be removed in key_delsav(), when the reference count
112 * field hits 0 (= no external reference other than from SA header.
113 */
114
115 VNET_DEFINE(u_int32_t, key_debug_level) = 0;
116 VNET_DEFINE_STATIC(u_int, key_spi_trycnt) = 1000;
117 VNET_DEFINE_STATIC(u_int32_t, key_spi_minval) = 0x100;
118 VNET_DEFINE_STATIC(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */
119 VNET_DEFINE_STATIC(u_int32_t, policy_id) = 0;
120 /*interval to initialize randseed,1(m)*/
121 VNET_DEFINE_STATIC(u_int, key_int_random) = 60;
122 /* interval to expire acquiring, 30(s)*/
123 VNET_DEFINE_STATIC(u_int, key_larval_lifetime) = 30;
124 /* counter for blocking SADB_ACQUIRE.*/
125 VNET_DEFINE_STATIC(int, key_blockacq_count) = 10;
126 /* lifetime for blocking SADB_ACQUIRE.*/
127 VNET_DEFINE_STATIC(int, key_blockacq_lifetime) = 20;
128 /* preferred old sa rather than new sa.*/
129 VNET_DEFINE_STATIC(int, key_preferred_oldsa) = 1;
130 #define V_key_spi_trycnt VNET(key_spi_trycnt)
131 #define V_key_spi_minval VNET(key_spi_minval)
132 #define V_key_spi_maxval VNET(key_spi_maxval)
133 #define V_policy_id VNET(policy_id)
134 #define V_key_int_random VNET(key_int_random)
135 #define V_key_larval_lifetime VNET(key_larval_lifetime)
136 #define V_key_blockacq_count VNET(key_blockacq_count)
137 #define V_key_blockacq_lifetime VNET(key_blockacq_lifetime)
138 #define V_key_preferred_oldsa VNET(key_preferred_oldsa)
139
140 VNET_DEFINE_STATIC(u_int32_t, acq_seq) = 0;
141 #define V_acq_seq VNET(acq_seq)
142
143 VNET_DEFINE_STATIC(uint32_t, sp_genid) = 0;
144 #define V_sp_genid VNET(sp_genid)
145
146 /* SPD */
147 TAILQ_HEAD(secpolicy_queue, secpolicy);
148 LIST_HEAD(secpolicy_list, secpolicy);
149 VNET_DEFINE_STATIC(struct secpolicy_queue, sptree[IPSEC_DIR_MAX]);
150 VNET_DEFINE_STATIC(struct secpolicy_queue, sptree_ifnet[IPSEC_DIR_MAX]);
151 static struct rmlock sptree_lock;
152 #define V_sptree VNET(sptree)
153 #define V_sptree_ifnet VNET(sptree_ifnet)
154 #define SPTREE_LOCK_INIT() rm_init(&sptree_lock, "sptree")
155 #define SPTREE_LOCK_DESTROY() rm_destroy(&sptree_lock)
156 #define SPTREE_RLOCK_TRACKER struct rm_priotracker sptree_tracker
157 #define SPTREE_RLOCK() rm_rlock(&sptree_lock, &sptree_tracker)
158 #define SPTREE_RUNLOCK() rm_runlock(&sptree_lock, &sptree_tracker)
159 #define SPTREE_RLOCK_ASSERT() rm_assert(&sptree_lock, RA_RLOCKED)
160 #define SPTREE_WLOCK() rm_wlock(&sptree_lock)
161 #define SPTREE_WUNLOCK() rm_wunlock(&sptree_lock)
162 #define SPTREE_WLOCK_ASSERT() rm_assert(&sptree_lock, RA_WLOCKED)
163 #define SPTREE_UNLOCK_ASSERT() rm_assert(&sptree_lock, RA_UNLOCKED)
164
165 /* Hash table for lookup SP using unique id */
166 VNET_DEFINE_STATIC(struct secpolicy_list *, sphashtbl);
167 VNET_DEFINE_STATIC(u_long, sphash_mask);
168 #define V_sphashtbl VNET(sphashtbl)
169 #define V_sphash_mask VNET(sphash_mask)
170
171 #define SPHASH_NHASH_LOG2 7
172 #define SPHASH_NHASH (1 << SPHASH_NHASH_LOG2)
173 #define SPHASH_HASHVAL(id) (key_u32hash(id) & V_sphash_mask)
174 #define SPHASH_HASH(id) &V_sphashtbl[SPHASH_HASHVAL(id)]
175
176 /* SPD cache */
177 struct spdcache_entry {
178 struct secpolicyindex spidx; /* secpolicyindex */
179 struct secpolicy *sp; /* cached policy to be used */
180
181 LIST_ENTRY(spdcache_entry) chain;
182 };
183 LIST_HEAD(spdcache_entry_list, spdcache_entry);
184
185 #define SPDCACHE_MAX_ENTRIES_PER_HASH 8
186
187 VNET_DEFINE_STATIC(u_int, key_spdcache_maxentries) = 0;
188 #define V_key_spdcache_maxentries VNET(key_spdcache_maxentries)
189 VNET_DEFINE_STATIC(u_int, key_spdcache_threshold) = 32;
190 #define V_key_spdcache_threshold VNET(key_spdcache_threshold)
191 VNET_DEFINE_STATIC(unsigned long, spd_size) = 0;
192 #define V_spd_size VNET(spd_size)
193
194 #define SPDCACHE_ENABLED() (V_key_spdcache_maxentries != 0)
195 #define SPDCACHE_ACTIVE() \
196 (SPDCACHE_ENABLED() && V_spd_size >= V_key_spdcache_threshold)
197
198 VNET_DEFINE_STATIC(struct spdcache_entry_list *, spdcachehashtbl);
199 VNET_DEFINE_STATIC(u_long, spdcachehash_mask);
200 #define V_spdcachehashtbl VNET(spdcachehashtbl)
201 #define V_spdcachehash_mask VNET(spdcachehash_mask)
202
203 #define SPDCACHE_HASHVAL(idx) \
204 (key_addrprotohash(&(idx)->src, &(idx)->dst, &(idx)->ul_proto) & \
205 V_spdcachehash_mask)
206
207 /* Each cache line is protected by a mutex */
208 VNET_DEFINE_STATIC(struct mtx *, spdcache_lock);
209 #define V_spdcache_lock VNET(spdcache_lock)
210
211 #define SPDCACHE_LOCK_INIT(a) \
212 mtx_init(&V_spdcache_lock[a], "spdcache", \
213 "fast ipsec SPD cache", MTX_DEF|MTX_DUPOK)
214 #define SPDCACHE_LOCK_DESTROY(a) mtx_destroy(&V_spdcache_lock[a])
215 #define SPDCACHE_LOCK(a) mtx_lock(&V_spdcache_lock[a]);
216 #define SPDCACHE_UNLOCK(a) mtx_unlock(&V_spdcache_lock[a]);
217
218 /* SAD */
219 TAILQ_HEAD(secashead_queue, secashead);
220 LIST_HEAD(secashead_list, secashead);
221 VNET_DEFINE_STATIC(struct secashead_queue, sahtree);
222 static struct rmlock sahtree_lock;
223 #define V_sahtree VNET(sahtree)
224 #define SAHTREE_LOCK_INIT() rm_init(&sahtree_lock, "sahtree")
225 #define SAHTREE_LOCK_DESTROY() rm_destroy(&sahtree_lock)
226 #define SAHTREE_RLOCK_TRACKER struct rm_priotracker sahtree_tracker
227 #define SAHTREE_RLOCK() rm_rlock(&sahtree_lock, &sahtree_tracker)
228 #define SAHTREE_RUNLOCK() rm_runlock(&sahtree_lock, &sahtree_tracker)
229 #define SAHTREE_RLOCK_ASSERT() rm_assert(&sahtree_lock, RA_RLOCKED)
230 #define SAHTREE_WLOCK() rm_wlock(&sahtree_lock)
231 #define SAHTREE_WUNLOCK() rm_wunlock(&sahtree_lock)
232 #define SAHTREE_WLOCK_ASSERT() rm_assert(&sahtree_lock, RA_WLOCKED)
233 #define SAHTREE_UNLOCK_ASSERT() rm_assert(&sahtree_lock, RA_UNLOCKED)
234
235 /* Hash table for lookup in SAD using SA addresses */
236 VNET_DEFINE_STATIC(struct secashead_list *, sahaddrhashtbl);
237 VNET_DEFINE_STATIC(u_long, sahaddrhash_mask);
238 #define V_sahaddrhashtbl VNET(sahaddrhashtbl)
239 #define V_sahaddrhash_mask VNET(sahaddrhash_mask)
240
241 #define SAHHASH_NHASH_LOG2 7
242 #define SAHHASH_NHASH (1 << SAHHASH_NHASH_LOG2)
243 #define SAHADDRHASH_HASHVAL(idx) \
244 (key_addrprotohash(&(idx)->src, &(idx)->dst, &(idx)->proto) & \
245 V_sahaddrhash_mask)
246 #define SAHADDRHASH_HASH(saidx) \
247 &V_sahaddrhashtbl[SAHADDRHASH_HASHVAL(saidx)]
248
249 /* Hash table for lookup in SAD using SPI */
250 LIST_HEAD(secasvar_list, secasvar);
251 VNET_DEFINE_STATIC(struct secasvar_list *, savhashtbl);
252 VNET_DEFINE_STATIC(u_long, savhash_mask);
253 #define V_savhashtbl VNET(savhashtbl)
254 #define V_savhash_mask VNET(savhash_mask)
255 #define SAVHASH_NHASH_LOG2 7
256 #define SAVHASH_NHASH (1 << SAVHASH_NHASH_LOG2)
257 #define SAVHASH_HASHVAL(spi) (key_u32hash(spi) & V_savhash_mask)
258 #define SAVHASH_HASH(spi) &V_savhashtbl[SAVHASH_HASHVAL(spi)]
259
260 static uint32_t
key_addrprotohash(const union sockaddr_union * src,const union sockaddr_union * dst,const uint8_t * proto)261 key_addrprotohash(const union sockaddr_union *src,
262 const union sockaddr_union *dst, const uint8_t *proto)
263 {
264 uint32_t hval;
265
266 hval = fnv_32_buf(proto, sizeof(*proto),
267 FNV1_32_INIT);
268 switch (dst->sa.sa_family) {
269 #ifdef INET
270 case AF_INET:
271 hval = fnv_32_buf(&src->sin.sin_addr,
272 sizeof(in_addr_t), hval);
273 hval = fnv_32_buf(&dst->sin.sin_addr,
274 sizeof(in_addr_t), hval);
275 break;
276 #endif
277 #ifdef INET6
278 case AF_INET6:
279 hval = fnv_32_buf(&src->sin6.sin6_addr,
280 sizeof(struct in6_addr), hval);
281 hval = fnv_32_buf(&dst->sin6.sin6_addr,
282 sizeof(struct in6_addr), hval);
283 break;
284 #endif
285 default:
286 hval = 0;
287 ipseclog((LOG_DEBUG, "%s: unknown address family %d\n",
288 __func__, dst->sa.sa_family));
289 }
290 return (hval);
291 }
292
293 static uint32_t
key_u32hash(uint32_t val)294 key_u32hash(uint32_t val)
295 {
296
297 return (fnv_32_buf(&val, sizeof(val), FNV1_32_INIT));
298 }
299
300 /* registed list */
301 VNET_DEFINE_STATIC(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]);
302 #define V_regtree VNET(regtree)
303 static struct mtx regtree_lock;
304 #define REGTREE_LOCK_INIT() \
305 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF)
306 #define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock)
307 #define REGTREE_LOCK() mtx_lock(®tree_lock)
308 #define REGTREE_UNLOCK() mtx_unlock(®tree_lock)
309 #define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED)
310
311 /* Acquiring list */
312 LIST_HEAD(secacq_list, secacq);
313 VNET_DEFINE_STATIC(struct secacq_list, acqtree);
314 #define V_acqtree VNET(acqtree)
315 static struct mtx acq_lock;
316 #define ACQ_LOCK_INIT() \
317 mtx_init(&acq_lock, "acqtree", "ipsec SA acquiring list", MTX_DEF)
318 #define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock)
319 #define ACQ_LOCK() mtx_lock(&acq_lock)
320 #define ACQ_UNLOCK() mtx_unlock(&acq_lock)
321 #define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED)
322
323 /* Hash table for lookup in ACQ list using SA addresses */
324 VNET_DEFINE_STATIC(struct secacq_list *, acqaddrhashtbl);
325 VNET_DEFINE_STATIC(u_long, acqaddrhash_mask);
326 #define V_acqaddrhashtbl VNET(acqaddrhashtbl)
327 #define V_acqaddrhash_mask VNET(acqaddrhash_mask)
328
329 /* Hash table for lookup in ACQ list using SEQ number */
330 VNET_DEFINE_STATIC(struct secacq_list *, acqseqhashtbl);
331 VNET_DEFINE_STATIC(u_long, acqseqhash_mask);
332 #define V_acqseqhashtbl VNET(acqseqhashtbl)
333 #define V_acqseqhash_mask VNET(acqseqhash_mask)
334
335 #define ACQHASH_NHASH_LOG2 7
336 #define ACQHASH_NHASH (1 << ACQHASH_NHASH_LOG2)
337 #define ACQADDRHASH_HASHVAL(idx) \
338 (key_addrprotohash(&(idx)->src, &(idx)->dst, &(idx)->proto) & \
339 V_acqaddrhash_mask)
340 #define ACQSEQHASH_HASHVAL(seq) \
341 (key_u32hash(seq) & V_acqseqhash_mask)
342 #define ACQADDRHASH_HASH(saidx) \
343 &V_acqaddrhashtbl[ACQADDRHASH_HASHVAL(saidx)]
344 #define ACQSEQHASH_HASH(seq) \
345 &V_acqseqhashtbl[ACQSEQHASH_HASHVAL(seq)]
346 /* SP acquiring list */
347 VNET_DEFINE_STATIC(LIST_HEAD(_spacqtree, secspacq), spacqtree);
348 #define V_spacqtree VNET(spacqtree)
349 static struct mtx spacq_lock;
350 #define SPACQ_LOCK_INIT() \
351 mtx_init(&spacq_lock, "spacqtree", \
352 "fast ipsec security policy acquire list", MTX_DEF)
353 #define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock)
354 #define SPACQ_LOCK() mtx_lock(&spacq_lock)
355 #define SPACQ_UNLOCK() mtx_unlock(&spacq_lock)
356 #define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED)
357
358 static const int minsize[] = {
359 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
360 sizeof(struct sadb_sa), /* SADB_EXT_SA */
361 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
362 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
363 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
364 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */
365 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */
366 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */
367 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */
368 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */
369 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */
370 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */
371 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */
372 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */
373 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */
374 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */
375 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
376 0, /* SADB_X_EXT_KMPRIVATE */
377 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */
378 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
379 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */
380 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */
381 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */
382 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAI */
383 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAR */
384 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */
385 sizeof(struct sadb_x_sa_replay), /* SADB_X_EXT_SA_REPLAY */
386 sizeof(struct sadb_address), /* SADB_X_EXT_NEW_ADDRESS_SRC */
387 sizeof(struct sadb_address), /* SADB_X_EXT_NEW_ADDRESS_DST */
388 };
389 _Static_assert(sizeof(minsize)/sizeof(int) == SADB_EXT_MAX + 1, "minsize size mismatch");
390
391 static const int maxsize[] = {
392 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
393 sizeof(struct sadb_sa), /* SADB_EXT_SA */
394 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
395 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
396 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
397 0, /* SADB_EXT_ADDRESS_SRC */
398 0, /* SADB_EXT_ADDRESS_DST */
399 0, /* SADB_EXT_ADDRESS_PROXY */
400 0, /* SADB_EXT_KEY_AUTH */
401 0, /* SADB_EXT_KEY_ENCRYPT */
402 0, /* SADB_EXT_IDENTITY_SRC */
403 0, /* SADB_EXT_IDENTITY_DST */
404 0, /* SADB_EXT_SENSITIVITY */
405 0, /* SADB_EXT_PROPOSAL */
406 0, /* SADB_EXT_SUPPORTED_AUTH */
407 0, /* SADB_EXT_SUPPORTED_ENCRYPT */
408 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
409 0, /* SADB_X_EXT_KMPRIVATE */
410 0, /* SADB_X_EXT_POLICY */
411 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
412 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */
413 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */
414 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */
415 0, /* SADB_X_EXT_NAT_T_OAI */
416 0, /* SADB_X_EXT_NAT_T_OAR */
417 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */
418 sizeof(struct sadb_x_sa_replay), /* SADB_X_EXT_SA_REPLAY */
419 0, /* SADB_X_EXT_NEW_ADDRESS_SRC */
420 0, /* SADB_X_EXT_NEW_ADDRESS_DST */
421 };
422 _Static_assert(sizeof(maxsize)/sizeof(int) == SADB_EXT_MAX + 1, "minsize size mismatch");
423
424 /*
425 * Internal values for SA flags:
426 * SADB_X_EXT_F_CLONED means that SA was cloned by key_updateaddresses,
427 * thus we will not free the most of SA content in key_delsav().
428 */
429 #define SADB_X_EXT_F_CLONED 0x80000000
430
431 #define SADB_CHECKLEN(_mhp, _ext) \
432 ((_mhp)->extlen[(_ext)] < minsize[(_ext)] || (maxsize[(_ext)] != 0 && \
433 ((_mhp)->extlen[(_ext)] > maxsize[(_ext)])))
434 #define SADB_CHECKHDR(_mhp, _ext) ((_mhp)->ext[(_ext)] == NULL)
435
436 VNET_DEFINE_STATIC(int, ipsec_esp_keymin) = 256;
437 VNET_DEFINE_STATIC(int, ipsec_esp_auth) = 0;
438 VNET_DEFINE_STATIC(int, ipsec_ah_keymin) = 128;
439
440 #define V_ipsec_esp_keymin VNET(ipsec_esp_keymin)
441 #define V_ipsec_esp_auth VNET(ipsec_esp_auth)
442 #define V_ipsec_ah_keymin VNET(ipsec_ah_keymin)
443
444 #ifdef IPSEC_DEBUG
445 VNET_DEFINE(int, ipsec_debug) = 1;
446 #else
447 VNET_DEFINE(int, ipsec_debug) = 0;
448 #endif
449
450 #ifdef INET
451 SYSCTL_DECL(_net_inet_ipsec);
452 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, debug,
453 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_debug), 0,
454 "Enable IPsec debugging output when set.");
455 #endif
456 #ifdef INET6
457 SYSCTL_DECL(_net_inet6_ipsec6);
458 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, debug,
459 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_debug), 0,
460 "Enable IPsec debugging output when set.");
461 #endif
462
463 SYSCTL_DECL(_net_key);
464 SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug,
465 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_debug_level), 0, "");
466
467 /* max count of trial for the decision of spi value */
468 SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt,
469 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_trycnt), 0, "");
470
471 /* minimum spi value to allocate automatically. */
472 SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval,
473 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_minval), 0, "");
474
475 /* maximun spi value to allocate automatically. */
476 SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval,
477 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_spi_maxval), 0, "");
478
479 /* interval to initialize randseed */
480 SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random,
481 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_int_random), 0, "");
482
483 /* lifetime for larval SA */
484 SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime,
485 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_larval_lifetime), 0, "");
486
487 /* counter for blocking to send SADB_ACQUIRE to IKEd */
488 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count,
489 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_count), 0, "");
490
491 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */
492 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime,
493 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, "");
494
495 /* ESP auth */
496 SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth,
497 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, "");
498
499 /* minimum ESP key length */
500 SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin,
501 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, "");
502
503 /* minimum AH key length */
504 SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin,
505 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipsec_ah_keymin), 0, "");
506
507 /* perfered old SA rather than new SA */
508 SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, preferred_oldsa,
509 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(key_preferred_oldsa), 0, "");
510
511 static SYSCTL_NODE(_net_key, OID_AUTO, spdcache, CTLFLAG_RW, 0, "SPD cache");
512
513 SYSCTL_UINT(_net_key_spdcache, OID_AUTO, maxentries,
514 CTLFLAG_VNET | CTLFLAG_RDTUN, &VNET_NAME(key_spdcache_maxentries), 0,
515 "Maximum number of entries in the SPD cache"
516 " (power of 2, 0 to disable)");
517
518 SYSCTL_UINT(_net_key_spdcache, OID_AUTO, threshold,
519 CTLFLAG_VNET | CTLFLAG_RDTUN, &VNET_NAME(key_spdcache_threshold), 0,
520 "Number of SPs that make the SPD cache active");
521
522 #define __LIST_CHAINED(elm) \
523 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL))
524
525 MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association");
526 MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head");
527 MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy");
528 MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request");
529 MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous");
530 MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire");
531 MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire");
532 MALLOC_DEFINE(M_IPSEC_SPDCACHE, "ipsec-spdcache", "ipsec SPD cache");
533
534 VNET_DEFINE_STATIC(uma_zone_t, key_lft_zone);
535 #define V_key_lft_zone VNET(key_lft_zone)
536
537 /*
538 * set parameters into secpolicyindex buffer.
539 * Must allocate secpolicyindex buffer passed to this function.
540 */
541 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \
542 do { \
543 bzero((idx), sizeof(struct secpolicyindex)); \
544 (idx)->dir = (_dir); \
545 (idx)->prefs = (ps); \
546 (idx)->prefd = (pd); \
547 (idx)->ul_proto = (ulp); \
548 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
549 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
550 } while (0)
551
552 /*
553 * set parameters into secasindex buffer.
554 * Must allocate secasindex buffer before calling this function.
555 */
556 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \
557 do { \
558 bzero((idx), sizeof(struct secasindex)); \
559 (idx)->proto = (p); \
560 (idx)->mode = (m); \
561 (idx)->reqid = (r); \
562 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
563 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
564 key_porttosaddr(&(idx)->src.sa, 0); \
565 key_porttosaddr(&(idx)->dst.sa, 0); \
566 } while (0)
567
568 /* key statistics */
569 struct _keystat {
570 u_long getspi_count; /* the avarage of count to try to get new SPI */
571 } keystat;
572
573 struct sadb_msghdr {
574 struct sadb_msg *msg;
575 struct sadb_ext *ext[SADB_EXT_MAX + 1];
576 int extoff[SADB_EXT_MAX + 1];
577 int extlen[SADB_EXT_MAX + 1];
578 };
579
580 static struct supported_ealgs {
581 int sadb_alg;
582 const struct enc_xform *xform;
583 } supported_ealgs[] = {
584 { SADB_EALG_DESCBC, &enc_xform_des },
585 { SADB_EALG_3DESCBC, &enc_xform_3des },
586 { SADB_X_EALG_AES, &enc_xform_rijndael128 },
587 { SADB_X_EALG_BLOWFISHCBC, &enc_xform_blf },
588 { SADB_X_EALG_CAST128CBC, &enc_xform_cast5 },
589 { SADB_EALG_NULL, &enc_xform_null },
590 { SADB_X_EALG_CAMELLIACBC, &enc_xform_camellia },
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 };
595
596 static struct supported_aalgs {
597 int sadb_alg;
598 const struct auth_hash *xform;
599 } supported_aalgs[] = {
600 { SADB_X_AALG_NULL, &auth_hash_null },
601 { SADB_AALG_MD5HMAC, &auth_hash_hmac_md5 },
602 { SADB_AALG_SHA1HMAC, &auth_hash_hmac_sha1 },
603 { SADB_X_AALG_RIPEMD160HMAC, &auth_hash_hmac_ripemd_160 },
604 { SADB_X_AALG_MD5, &auth_hash_key_md5 },
605 { SADB_X_AALG_SHA, &auth_hash_key_sha1 },
606 { SADB_X_AALG_SHA2_256, &auth_hash_hmac_sha2_256 },
607 { SADB_X_AALG_SHA2_384, &auth_hash_hmac_sha2_384 },
608 { SADB_X_AALG_SHA2_512, &auth_hash_hmac_sha2_512 },
609 { SADB_X_AALG_AES128GMAC, &auth_hash_nist_gmac_aes_128 },
610 { SADB_X_AALG_AES192GMAC, &auth_hash_nist_gmac_aes_192 },
611 { SADB_X_AALG_AES256GMAC, &auth_hash_nist_gmac_aes_256 },
612 };
613
614 static struct supported_calgs {
615 int sadb_alg;
616 const struct comp_algo *xform;
617 } supported_calgs[] = {
618 { SADB_X_CALG_DEFLATE, &comp_algo_deflate },
619 };
620
621 #ifndef IPSEC_DEBUG2
622 static struct callout key_timer;
623 #endif
624
625 static void key_unlink(struct secpolicy *);
626 static struct secpolicy *key_do_allocsp(struct secpolicyindex *spidx, u_int dir);
627 static struct secpolicy *key_getsp(struct secpolicyindex *);
628 static struct secpolicy *key_getspbyid(u_int32_t);
629 static struct mbuf *key_gather_mbuf(struct mbuf *,
630 const struct sadb_msghdr *, int, int, ...);
631 static int key_spdadd(struct socket *, struct mbuf *,
632 const struct sadb_msghdr *);
633 static uint32_t key_getnewspid(void);
634 static int key_spddelete(struct socket *, struct mbuf *,
635 const struct sadb_msghdr *);
636 static int key_spddelete2(struct socket *, struct mbuf *,
637 const struct sadb_msghdr *);
638 static int key_spdget(struct socket *, struct mbuf *,
639 const struct sadb_msghdr *);
640 static int key_spdflush(struct socket *, struct mbuf *,
641 const struct sadb_msghdr *);
642 static int key_spddump(struct socket *, struct mbuf *,
643 const struct sadb_msghdr *);
644 static struct mbuf *key_setdumpsp(struct secpolicy *,
645 u_int8_t, u_int32_t, u_int32_t);
646 static struct mbuf *key_sp2mbuf(struct secpolicy *);
647 static size_t key_getspreqmsglen(struct secpolicy *);
648 static int key_spdexpire(struct secpolicy *);
649 static struct secashead *key_newsah(struct secasindex *);
650 static void key_freesah(struct secashead **);
651 static void key_delsah(struct secashead *);
652 static struct secasvar *key_newsav(const struct sadb_msghdr *,
653 struct secasindex *, uint32_t, int *);
654 static void key_delsav(struct secasvar *);
655 static void key_unlinksav(struct secasvar *);
656 static struct secashead *key_getsah(struct secasindex *);
657 static int key_checkspidup(uint32_t);
658 static struct secasvar *key_getsavbyspi(uint32_t);
659 static int key_setnatt(struct secasvar *, const struct sadb_msghdr *);
660 static int key_setsaval(struct secasvar *, const struct sadb_msghdr *);
661 static int key_updatelifetimes(struct secasvar *, const struct sadb_msghdr *);
662 static int key_updateaddresses(struct socket *, struct mbuf *,
663 const struct sadb_msghdr *, struct secasvar *, struct secasindex *);
664
665 static struct mbuf *key_setdumpsa(struct secasvar *, u_int8_t,
666 u_int8_t, u_int32_t, u_int32_t);
667 static struct mbuf *key_setsadbmsg(u_int8_t, u_int16_t, u_int8_t,
668 u_int32_t, pid_t, u_int16_t);
669 static struct mbuf *key_setsadbsa(struct secasvar *);
670 static struct mbuf *key_setsadbaddr(u_int16_t,
671 const struct sockaddr *, u_int8_t, u_int16_t);
672 static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t);
673 static struct mbuf *key_setsadbxtype(u_int16_t);
674 static struct mbuf *key_setsadbxsa2(u_int8_t, u_int32_t, u_int32_t);
675 static struct mbuf *key_setsadbxsareplay(u_int32_t);
676 static struct mbuf *key_setsadbxpolicy(u_int16_t, u_int8_t,
677 u_int32_t, u_int32_t);
678 static struct seckey *key_dup_keymsg(const struct sadb_key *, size_t,
679 struct malloc_type *);
680 static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src,
681 struct malloc_type *);
682
683 /* flags for key_cmpsaidx() */
684 #define CMP_HEAD 1 /* protocol, addresses. */
685 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */
686 #define CMP_REQID 3 /* additionally HEAD, reaid. */
687 #define CMP_EXACTLY 4 /* all elements. */
688 static int key_cmpsaidx(const struct secasindex *,
689 const struct secasindex *, int);
690 static int key_cmpspidx_exactly(struct secpolicyindex *,
691 struct secpolicyindex *);
692 static int key_cmpspidx_withmask(struct secpolicyindex *,
693 struct secpolicyindex *);
694 static int key_bbcmp(const void *, const void *, u_int);
695 static uint8_t key_satype2proto(uint8_t);
696 static uint8_t key_proto2satype(uint8_t);
697
698 static int key_getspi(struct socket *, struct mbuf *,
699 const struct sadb_msghdr *);
700 static uint32_t key_do_getnewspi(struct sadb_spirange *, struct secasindex *);
701 static int key_update(struct socket *, struct mbuf *,
702 const struct sadb_msghdr *);
703 static int key_add(struct socket *, struct mbuf *,
704 const struct sadb_msghdr *);
705 static int key_setident(struct secashead *, const struct sadb_msghdr *);
706 static struct mbuf *key_getmsgbuf_x1(struct mbuf *,
707 const struct sadb_msghdr *);
708 static int key_delete(struct socket *, struct mbuf *,
709 const struct sadb_msghdr *);
710 static int key_delete_all(struct socket *, struct mbuf *,
711 const struct sadb_msghdr *, struct secasindex *);
712 static int key_get(struct socket *, struct mbuf *,
713 const struct sadb_msghdr *);
714
715 static void key_getcomb_setlifetime(struct sadb_comb *);
716 static struct mbuf *key_getcomb_ealg(void);
717 static struct mbuf *key_getcomb_ah(void);
718 static struct mbuf *key_getcomb_ipcomp(void);
719 static struct mbuf *key_getprop(const struct secasindex *);
720
721 static int key_acquire(const struct secasindex *, struct secpolicy *);
722 static uint32_t key_newacq(const struct secasindex *, int *);
723 static uint32_t key_getacq(const struct secasindex *, int *);
724 static int key_acqdone(const struct secasindex *, uint32_t);
725 static int key_acqreset(uint32_t);
726 static struct secspacq *key_newspacq(struct secpolicyindex *);
727 static struct secspacq *key_getspacq(struct secpolicyindex *);
728 static int key_acquire2(struct socket *, struct mbuf *,
729 const struct sadb_msghdr *);
730 static int key_register(struct socket *, struct mbuf *,
731 const struct sadb_msghdr *);
732 static int key_expire(struct secasvar *, int);
733 static int key_flush(struct socket *, struct mbuf *,
734 const struct sadb_msghdr *);
735 static int key_dump(struct socket *, struct mbuf *,
736 const struct sadb_msghdr *);
737 static int key_promisc(struct socket *, struct mbuf *,
738 const struct sadb_msghdr *);
739 static int key_senderror(struct socket *, struct mbuf *, int);
740 static int key_validate_ext(const struct sadb_ext *, int);
741 static int key_align(struct mbuf *, struct sadb_msghdr *);
742 static struct mbuf *key_setlifetime(struct seclifetime *, uint16_t);
743 static struct mbuf *key_setkey(struct seckey *, uint16_t);
744
745 static void spdcache_init(void);
746 static void spdcache_clear(void);
747 static struct spdcache_entry *spdcache_entry_alloc(
748 const struct secpolicyindex *spidx,
749 struct secpolicy *policy);
750 static void spdcache_entry_free(struct spdcache_entry *entry);
751 #ifdef VIMAGE
752 static void spdcache_destroy(void);
753 #endif
754
755 #define DBG_IPSEC_INITREF(t, p) do { \
756 refcount_init(&(p)->refcnt, 1); \
757 KEYDBG(KEY_STAMP, \
758 printf("%s: Initialize refcnt %s(%p) = %u\n", \
759 __func__, #t, (p), (p)->refcnt)); \
760 } while (0)
761 #define DBG_IPSEC_ADDREF(t, p) do { \
762 refcount_acquire(&(p)->refcnt); \
763 KEYDBG(KEY_STAMP, \
764 printf("%s: Acquire refcnt %s(%p) -> %u\n", \
765 __func__, #t, (p), (p)->refcnt)); \
766 } while (0)
767 #define DBG_IPSEC_DELREF(t, p) do { \
768 KEYDBG(KEY_STAMP, \
769 printf("%s: Release refcnt %s(%p) -> %u\n", \
770 __func__, #t, (p), (p)->refcnt - 1)); \
771 refcount_release(&(p)->refcnt); \
772 } while (0)
773
774 #define IPSEC_INITREF(t, p) refcount_init(&(p)->refcnt, 1)
775 #define IPSEC_ADDREF(t, p) refcount_acquire(&(p)->refcnt)
776 #define IPSEC_DELREF(t, p) refcount_release(&(p)->refcnt)
777
778 #define SP_INITREF(p) IPSEC_INITREF(SP, p)
779 #define SP_ADDREF(p) IPSEC_ADDREF(SP, p)
780 #define SP_DELREF(p) IPSEC_DELREF(SP, p)
781
782 #define SAH_INITREF(p) IPSEC_INITREF(SAH, p)
783 #define SAH_ADDREF(p) IPSEC_ADDREF(SAH, p)
784 #define SAH_DELREF(p) IPSEC_DELREF(SAH, p)
785
786 #define SAV_INITREF(p) IPSEC_INITREF(SAV, p)
787 #define SAV_ADDREF(p) IPSEC_ADDREF(SAV, p)
788 #define SAV_DELREF(p) IPSEC_DELREF(SAV, p)
789
790 /*
791 * Update the refcnt while holding the SPTREE lock.
792 */
793 void
key_addref(struct secpolicy * sp)794 key_addref(struct secpolicy *sp)
795 {
796
797 SP_ADDREF(sp);
798 }
799
800 /*
801 * Return 0 when there are known to be no SP's for the specified
802 * direction. Otherwise return 1. This is used by IPsec code
803 * to optimize performance.
804 */
805 int
key_havesp(u_int dir)806 key_havesp(u_int dir)
807 {
808
809 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ?
810 TAILQ_FIRST(&V_sptree[dir]) != NULL : 1);
811 }
812
813 /* %%% IPsec policy management */
814 /*
815 * Return current SPDB generation.
816 */
817 uint32_t
key_getspgen(void)818 key_getspgen(void)
819 {
820
821 return (V_sp_genid);
822 }
823
824 void
key_bumpspgen(void)825 key_bumpspgen(void)
826 {
827
828 V_sp_genid++;
829 }
830
831 static int
key_checksockaddrs(struct sockaddr * src,struct sockaddr * dst)832 key_checksockaddrs(struct sockaddr *src, struct sockaddr *dst)
833 {
834
835 /* family match */
836 if (src->sa_family != dst->sa_family)
837 return (EINVAL);
838 /* sa_len match */
839 if (src->sa_len != dst->sa_len)
840 return (EINVAL);
841 switch (src->sa_family) {
842 #ifdef INET
843 case AF_INET:
844 if (src->sa_len != sizeof(struct sockaddr_in))
845 return (EINVAL);
846 break;
847 #endif
848 #ifdef INET6
849 case AF_INET6:
850 if (src->sa_len != sizeof(struct sockaddr_in6))
851 return (EINVAL);
852 break;
853 #endif
854 default:
855 return (EAFNOSUPPORT);
856 }
857 return (0);
858 }
859
860 struct secpolicy *
key_do_allocsp(struct secpolicyindex * spidx,u_int dir)861 key_do_allocsp(struct secpolicyindex *spidx, u_int dir)
862 {
863 SPTREE_RLOCK_TRACKER;
864 struct secpolicy *sp;
865
866 IPSEC_ASSERT(spidx != NULL, ("null spidx"));
867 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
868 ("invalid direction %u", dir));
869
870 SPTREE_RLOCK();
871 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
872 if (key_cmpspidx_withmask(&sp->spidx, spidx)) {
873 SP_ADDREF(sp);
874 break;
875 }
876 }
877 SPTREE_RUNLOCK();
878 return (sp);
879 }
880
881
882 /*
883 * allocating a SP for OUTBOUND or INBOUND packet.
884 * Must call key_freesp() later.
885 * OUT: NULL: not found
886 * others: found and return the pointer.
887 */
888 struct secpolicy *
key_allocsp(struct secpolicyindex * spidx,u_int dir)889 key_allocsp(struct secpolicyindex *spidx, u_int dir)
890 {
891 struct spdcache_entry *entry, *lastentry, *tmpentry;
892 struct secpolicy *sp;
893 uint32_t hashv;
894 int nb_entries;
895
896 if (!SPDCACHE_ACTIVE()) {
897 sp = key_do_allocsp(spidx, dir);
898 goto out;
899 }
900
901 hashv = SPDCACHE_HASHVAL(spidx);
902 SPDCACHE_LOCK(hashv);
903 nb_entries = 0;
904 LIST_FOREACH_SAFE(entry, &V_spdcachehashtbl[hashv], chain, tmpentry) {
905 /* Removed outdated entries */
906 if (entry->sp != NULL &&
907 entry->sp->state == IPSEC_SPSTATE_DEAD) {
908 LIST_REMOVE(entry, chain);
909 spdcache_entry_free(entry);
910 continue;
911 }
912
913 nb_entries++;
914 if (!key_cmpspidx_exactly(&entry->spidx, spidx)) {
915 lastentry = entry;
916 continue;
917 }
918
919 sp = entry->sp;
920 if (entry->sp != NULL)
921 SP_ADDREF(sp);
922
923 /* IPSECSTAT_INC(ips_spdcache_hits); */
924
925 SPDCACHE_UNLOCK(hashv);
926 goto out;
927 }
928
929 /* IPSECSTAT_INC(ips_spdcache_misses); */
930
931 sp = key_do_allocsp(spidx, dir);
932 entry = spdcache_entry_alloc(spidx, sp);
933 if (entry != NULL) {
934 if (nb_entries >= SPDCACHE_MAX_ENTRIES_PER_HASH) {
935 LIST_REMOVE(lastentry, chain);
936 spdcache_entry_free(lastentry);
937 }
938
939 LIST_INSERT_HEAD(&V_spdcachehashtbl[hashv], entry, chain);
940 }
941
942 SPDCACHE_UNLOCK(hashv);
943
944 out:
945 if (sp != NULL) { /* found a SPD entry */
946 sp->lastused = time_second;
947 KEYDBG(IPSEC_STAMP,
948 printf("%s: return SP(%p)\n", __func__, sp));
949 KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
950 } else {
951 KEYDBG(IPSEC_DATA,
952 printf("%s: lookup failed for ", __func__);
953 kdebug_secpolicyindex(spidx, NULL));
954 }
955 return (sp);
956 }
957
958 /*
959 * Allocating an SA entry for an *INBOUND* or *OUTBOUND* TCP packet, signed
960 * or should be signed by MD5 signature.
961 * We don't use key_allocsa() for such lookups, because we don't know SPI.
962 * Unlike ESP and AH protocols, SPI isn't transmitted in the TCP header with
963 * signed packet. We use SADB only as storage for password.
964 * OUT: positive: corresponding SA for given saidx found.
965 * NULL: SA not found
966 */
967 struct secasvar *
key_allocsa_tcpmd5(struct secasindex * saidx)968 key_allocsa_tcpmd5(struct secasindex *saidx)
969 {
970 SAHTREE_RLOCK_TRACKER;
971 struct secashead *sah;
972 struct secasvar *sav;
973
974 IPSEC_ASSERT(saidx->proto == IPPROTO_TCP,
975 ("unexpected security protocol %u", saidx->proto));
976 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TCPMD5,
977 ("unexpected mode %u", saidx->mode));
978
979 SAHTREE_RLOCK();
980 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
981 KEYDBG(IPSEC_DUMP,
982 printf("%s: checking SAH\n", __func__);
983 kdebug_secash(sah, " "));
984 if (sah->saidx.proto != IPPROTO_TCP)
985 continue;
986 if (!key_sockaddrcmp(&saidx->dst.sa, &sah->saidx.dst.sa, 0) &&
987 !key_sockaddrcmp(&saidx->src.sa, &sah->saidx.src.sa, 0))
988 break;
989 }
990 if (sah != NULL) {
991 if (V_key_preferred_oldsa)
992 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
993 else
994 sav = TAILQ_FIRST(&sah->savtree_alive);
995 if (sav != NULL)
996 SAV_ADDREF(sav);
997 } else
998 sav = NULL;
999 SAHTREE_RUNLOCK();
1000
1001 if (sav != NULL) {
1002 KEYDBG(IPSEC_STAMP,
1003 printf("%s: return SA(%p)\n", __func__, sav));
1004 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1005 } else {
1006 KEYDBG(IPSEC_STAMP,
1007 printf("%s: SA not found\n", __func__));
1008 KEYDBG(IPSEC_DATA, kdebug_secasindex(saidx, NULL));
1009 }
1010 return (sav);
1011 }
1012
1013 /*
1014 * Allocating an SA entry for an *OUTBOUND* packet.
1015 * OUT: positive: corresponding SA for given saidx found.
1016 * NULL: SA not found, but will be acquired, check *error
1017 * for acquiring status.
1018 */
1019 struct secasvar *
key_allocsa_policy(struct secpolicy * sp,const struct secasindex * saidx,int * error)1020 key_allocsa_policy(struct secpolicy *sp, const struct secasindex *saidx,
1021 int *error)
1022 {
1023 SAHTREE_RLOCK_TRACKER;
1024 struct secashead *sah;
1025 struct secasvar *sav;
1026
1027 IPSEC_ASSERT(saidx != NULL, ("null saidx"));
1028 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT ||
1029 saidx->mode == IPSEC_MODE_TUNNEL,
1030 ("unexpected policy %u", saidx->mode));
1031
1032 /*
1033 * We check new SA in the IPsec request because a different
1034 * SA may be involved each time this request is checked, either
1035 * because new SAs are being configured, or this request is
1036 * associated with an unconnected datagram socket, or this request
1037 * is associated with a system default policy.
1038 */
1039 SAHTREE_RLOCK();
1040 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
1041 KEYDBG(IPSEC_DUMP,
1042 printf("%s: checking SAH\n", __func__);
1043 kdebug_secash(sah, " "));
1044 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID))
1045 break;
1046
1047 }
1048 if (sah != NULL) {
1049 /*
1050 * Allocate the oldest SA available according to
1051 * draft-jenkins-ipsec-rekeying-03.
1052 */
1053 if (V_key_preferred_oldsa)
1054 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
1055 else
1056 sav = TAILQ_FIRST(&sah->savtree_alive);
1057 if (sav != NULL)
1058 SAV_ADDREF(sav);
1059 } else
1060 sav = NULL;
1061 SAHTREE_RUNLOCK();
1062
1063 if (sav != NULL) {
1064 *error = 0;
1065 KEYDBG(IPSEC_STAMP,
1066 printf("%s: chosen SA(%p) for SP(%p)\n", __func__,
1067 sav, sp));
1068 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1069 return (sav); /* return referenced SA */
1070 }
1071
1072 /* there is no SA */
1073 *error = key_acquire(saidx, sp);
1074 if ((*error) != 0)
1075 ipseclog((LOG_DEBUG,
1076 "%s: error %d returned from key_acquire()\n",
1077 __func__, *error));
1078 KEYDBG(IPSEC_STAMP,
1079 printf("%s: acquire SA for SP(%p), error %d\n",
1080 __func__, sp, *error));
1081 KEYDBG(IPSEC_DATA, kdebug_secasindex(saidx, NULL));
1082 return (NULL);
1083 }
1084
1085 /*
1086 * allocating a usable SA entry for a *INBOUND* packet.
1087 * Must call key_freesav() later.
1088 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state).
1089 * NULL: not found, or error occurred.
1090 *
1091 * According to RFC 2401 SA is uniquely identified by a triple SPI,
1092 * destination address, and security protocol. But according to RFC 4301,
1093 * SPI by itself suffices to specify an SA.
1094 *
1095 * Note that, however, we do need to keep source address in IPsec SA.
1096 * IKE specification and PF_KEY specification do assume that we
1097 * keep source address in IPsec SA. We see a tricky situation here.
1098 */
1099 struct secasvar *
key_allocsa(union sockaddr_union * dst,uint8_t proto,uint32_t spi)1100 key_allocsa(union sockaddr_union *dst, uint8_t proto, uint32_t spi)
1101 {
1102 SAHTREE_RLOCK_TRACKER;
1103 struct secasvar *sav;
1104
1105 IPSEC_ASSERT(proto == IPPROTO_ESP || proto == IPPROTO_AH ||
1106 proto == IPPROTO_IPCOMP, ("unexpected security protocol %u",
1107 proto));
1108
1109 SAHTREE_RLOCK();
1110 LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
1111 if (sav->spi == spi)
1112 break;
1113 }
1114 /*
1115 * We use single SPI namespace for all protocols, so it is
1116 * impossible to have SPI duplicates in the SAVHASH.
1117 */
1118 if (sav != NULL) {
1119 if (sav->state != SADB_SASTATE_LARVAL &&
1120 sav->sah->saidx.proto == proto &&
1121 key_sockaddrcmp(&dst->sa,
1122 &sav->sah->saidx.dst.sa, 0) == 0)
1123 SAV_ADDREF(sav);
1124 else
1125 sav = NULL;
1126 }
1127 SAHTREE_RUNLOCK();
1128
1129 if (sav == NULL) {
1130 KEYDBG(IPSEC_STAMP,
1131 char buf[IPSEC_ADDRSTRLEN];
1132 printf("%s: SA not found for spi %u proto %u dst %s\n",
1133 __func__, ntohl(spi), proto, ipsec_address(dst, buf,
1134 sizeof(buf))));
1135 } else {
1136 KEYDBG(IPSEC_STAMP,
1137 printf("%s: return SA(%p)\n", __func__, sav));
1138 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1139 }
1140 return (sav);
1141 }
1142
1143 struct secasvar *
key_allocsa_tunnel(union sockaddr_union * src,union sockaddr_union * dst,uint8_t proto)1144 key_allocsa_tunnel(union sockaddr_union *src, union sockaddr_union *dst,
1145 uint8_t proto)
1146 {
1147 SAHTREE_RLOCK_TRACKER;
1148 struct secasindex saidx;
1149 struct secashead *sah;
1150 struct secasvar *sav;
1151
1152 IPSEC_ASSERT(src != NULL, ("null src address"));
1153 IPSEC_ASSERT(dst != NULL, ("null dst address"));
1154
1155 KEY_SETSECASIDX(proto, IPSEC_MODE_TUNNEL, 0, &src->sa,
1156 &dst->sa, &saidx);
1157
1158 sav = NULL;
1159 SAHTREE_RLOCK();
1160 LIST_FOREACH(sah, SAHADDRHASH_HASH(&saidx), addrhash) {
1161 if (IPSEC_MODE_TUNNEL != sah->saidx.mode)
1162 continue;
1163 if (proto != sah->saidx.proto)
1164 continue;
1165 if (key_sockaddrcmp(&src->sa, &sah->saidx.src.sa, 0) != 0)
1166 continue;
1167 if (key_sockaddrcmp(&dst->sa, &sah->saidx.dst.sa, 0) != 0)
1168 continue;
1169 /* XXXAE: is key_preferred_oldsa reasonably?*/
1170 if (V_key_preferred_oldsa)
1171 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
1172 else
1173 sav = TAILQ_FIRST(&sah->savtree_alive);
1174 if (sav != NULL) {
1175 SAV_ADDREF(sav);
1176 break;
1177 }
1178 }
1179 SAHTREE_RUNLOCK();
1180 KEYDBG(IPSEC_STAMP,
1181 printf("%s: return SA(%p)\n", __func__, sav));
1182 if (sav != NULL)
1183 KEYDBG(IPSEC_DATA, kdebug_secasv(sav));
1184 return (sav);
1185 }
1186
1187 /*
1188 * Must be called after calling key_allocsp().
1189 */
1190 void
key_freesp(struct secpolicy ** spp)1191 key_freesp(struct secpolicy **spp)
1192 {
1193 struct secpolicy *sp = *spp;
1194
1195 IPSEC_ASSERT(sp != NULL, ("null sp"));
1196 if (SP_DELREF(sp) == 0)
1197 return;
1198
1199 KEYDBG(IPSEC_STAMP,
1200 printf("%s: last reference to SP(%p)\n", __func__, sp));
1201 KEYDBG(IPSEC_DATA, kdebug_secpolicy(sp));
1202
1203 *spp = NULL;
1204 while (sp->tcount > 0)
1205 ipsec_delisr(sp->req[--sp->tcount]);
1206 free(sp, M_IPSEC_SP);
1207 }
1208
1209 static void
key_unlink(struct secpolicy * sp)1210 key_unlink(struct secpolicy *sp)
1211 {
1212
1213 IPSEC_ASSERT(sp->spidx.dir == IPSEC_DIR_INBOUND ||
1214 sp->spidx.dir == IPSEC_DIR_OUTBOUND,
1215 ("invalid direction %u", sp->spidx.dir));
1216 SPTREE_UNLOCK_ASSERT();
1217
1218 KEYDBG(KEY_STAMP,
1219 printf("%s: SP(%p)\n", __func__, sp));
1220 SPTREE_WLOCK();
1221 if (sp->state != IPSEC_SPSTATE_ALIVE) {
1222 /* SP is already unlinked */
1223 SPTREE_WUNLOCK();
1224 return;
1225 }
1226 sp->state = IPSEC_SPSTATE_DEAD;
1227 TAILQ_REMOVE(&V_sptree[sp->spidx.dir], sp, chain);
1228 V_spd_size--;
1229 LIST_REMOVE(sp, idhash);
1230 V_sp_genid++;
1231 SPTREE_WUNLOCK();
1232 if (SPDCACHE_ENABLED())
1233 spdcache_clear();
1234 key_freesp(&sp);
1235 }
1236
1237 /*
1238 * insert a secpolicy into the SP database. Lower priorities first
1239 */
1240 static void
key_insertsp(struct secpolicy * newsp)1241 key_insertsp(struct secpolicy *newsp)
1242 {
1243 struct secpolicy *sp;
1244
1245 SPTREE_WLOCK_ASSERT();
1246 TAILQ_FOREACH(sp, &V_sptree[newsp->spidx.dir], chain) {
1247 if (newsp->priority < sp->priority) {
1248 TAILQ_INSERT_BEFORE(sp, newsp, chain);
1249 goto done;
1250 }
1251 }
1252 TAILQ_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, chain);
1253 done:
1254 LIST_INSERT_HEAD(SPHASH_HASH(newsp->id), newsp, idhash);
1255 newsp->state = IPSEC_SPSTATE_ALIVE;
1256 V_spd_size++;
1257 V_sp_genid++;
1258 }
1259
1260 /*
1261 * Insert a bunch of VTI secpolicies into the SPDB.
1262 * We keep VTI policies in the separate list due to following reasons:
1263 * 1) they should be immutable to user's or some deamon's attempts to
1264 * delete. The only way delete such policies - destroy or unconfigure
1265 * corresponding virtual inteface.
1266 * 2) such policies have traffic selector that matches all traffic per
1267 * address family.
1268 * Since all VTI policies have the same priority, we don't care about
1269 * policies order.
1270 */
1271 int
key_register_ifnet(struct secpolicy ** spp,u_int count)1272 key_register_ifnet(struct secpolicy **spp, u_int count)
1273 {
1274 struct mbuf *m;
1275 u_int i;
1276
1277 SPTREE_WLOCK();
1278 /*
1279 * First of try to acquire id for each SP.
1280 */
1281 for (i = 0; i < count; i++) {
1282 IPSEC_ASSERT(spp[i]->spidx.dir == IPSEC_DIR_INBOUND ||
1283 spp[i]->spidx.dir == IPSEC_DIR_OUTBOUND,
1284 ("invalid direction %u", spp[i]->spidx.dir));
1285
1286 if ((spp[i]->id = key_getnewspid()) == 0) {
1287 SPTREE_WUNLOCK();
1288 return (EAGAIN);
1289 }
1290 }
1291 for (i = 0; i < count; i++) {
1292 TAILQ_INSERT_TAIL(&V_sptree_ifnet[spp[i]->spidx.dir],
1293 spp[i], chain);
1294 /*
1295 * NOTE: despite the fact that we keep VTI SP in the
1296 * separate list, SPHASH contains policies from both
1297 * sources. Thus SADB_X_SPDGET will correctly return
1298 * SP by id, because it uses SPHASH for lookups.
1299 */
1300 LIST_INSERT_HEAD(SPHASH_HASH(spp[i]->id), spp[i], idhash);
1301 spp[i]->state = IPSEC_SPSTATE_IFNET;
1302 }
1303 SPTREE_WUNLOCK();
1304 /*
1305 * Notify user processes about new SP.
1306 */
1307 for (i = 0; i < count; i++) {
1308 m = key_setdumpsp(spp[i], SADB_X_SPDADD, 0, 0);
1309 if (m != NULL)
1310 key_sendup_mbuf(NULL, m, KEY_SENDUP_ALL);
1311 }
1312 return (0);
1313 }
1314
1315 void
key_unregister_ifnet(struct secpolicy ** spp,u_int count)1316 key_unregister_ifnet(struct secpolicy **spp, u_int count)
1317 {
1318 struct mbuf *m;
1319 u_int i;
1320
1321 SPTREE_WLOCK();
1322 for (i = 0; i < count; i++) {
1323 IPSEC_ASSERT(spp[i]->spidx.dir == IPSEC_DIR_INBOUND ||
1324 spp[i]->spidx.dir == IPSEC_DIR_OUTBOUND,
1325 ("invalid direction %u", spp[i]->spidx.dir));
1326
1327 if (spp[i]->state != IPSEC_SPSTATE_IFNET)
1328 continue;
1329 spp[i]->state = IPSEC_SPSTATE_DEAD;
1330 TAILQ_REMOVE(&V_sptree_ifnet[spp[i]->spidx.dir],
1331 spp[i], chain);
1332 V_spd_size--;
1333 LIST_REMOVE(spp[i], idhash);
1334 }
1335 SPTREE_WUNLOCK();
1336 if (SPDCACHE_ENABLED())
1337 spdcache_clear();
1338
1339 for (i = 0; i < count; i++) {
1340 m = key_setdumpsp(spp[i], SADB_X_SPDDELETE, 0, 0);
1341 if (m != NULL)
1342 key_sendup_mbuf(NULL, m, KEY_SENDUP_ALL);
1343 }
1344 }
1345
1346 /*
1347 * Must be called after calling key_allocsa().
1348 * This function is called by key_freesp() to free some SA allocated
1349 * for a policy.
1350 */
1351 void
key_freesav(struct secasvar ** psav)1352 key_freesav(struct secasvar **psav)
1353 {
1354 struct secasvar *sav = *psav;
1355
1356 IPSEC_ASSERT(sav != NULL, ("null sav"));
1357 if (SAV_DELREF(sav) == 0)
1358 return;
1359
1360 KEYDBG(IPSEC_STAMP,
1361 printf("%s: last reference to SA(%p)\n", __func__, sav));
1362
1363 *psav = NULL;
1364 key_delsav(sav);
1365 }
1366
1367 /*
1368 * Unlink SA from SAH and SPI hash under SAHTREE_WLOCK.
1369 * Expect that SA has extra reference due to lookup.
1370 * Release this references, also release SAH reference after unlink.
1371 */
1372 static void
key_unlinksav(struct secasvar * sav)1373 key_unlinksav(struct secasvar *sav)
1374 {
1375 struct secashead *sah;
1376
1377 KEYDBG(KEY_STAMP,
1378 printf("%s: SA(%p)\n", __func__, sav));
1379
1380 SAHTREE_UNLOCK_ASSERT();
1381 SAHTREE_WLOCK();
1382 if (sav->state == SADB_SASTATE_DEAD) {
1383 /* SA is already unlinked */
1384 SAHTREE_WUNLOCK();
1385 return;
1386 }
1387 /* Unlink from SAH */
1388 if (sav->state == SADB_SASTATE_LARVAL)
1389 TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
1390 else
1391 TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
1392 /* Unlink from SPI hash */
1393 LIST_REMOVE(sav, spihash);
1394 sav->state = SADB_SASTATE_DEAD;
1395 sah = sav->sah;
1396 SAHTREE_WUNLOCK();
1397 key_freesav(&sav);
1398 /* Since we are unlinked, release reference to SAH */
1399 key_freesah(&sah);
1400 }
1401
1402 /* %%% SPD management */
1403 /*
1404 * search SPD
1405 * OUT: NULL : not found
1406 * others : found, pointer to a SP.
1407 */
1408 static struct secpolicy *
key_getsp(struct secpolicyindex * spidx)1409 key_getsp(struct secpolicyindex *spidx)
1410 {
1411 SPTREE_RLOCK_TRACKER;
1412 struct secpolicy *sp;
1413
1414 IPSEC_ASSERT(spidx != NULL, ("null spidx"));
1415
1416 SPTREE_RLOCK();
1417 TAILQ_FOREACH(sp, &V_sptree[spidx->dir], chain) {
1418 if (key_cmpspidx_exactly(spidx, &sp->spidx)) {
1419 SP_ADDREF(sp);
1420 break;
1421 }
1422 }
1423 SPTREE_RUNLOCK();
1424
1425 return sp;
1426 }
1427
1428 /*
1429 * get SP by index.
1430 * OUT: NULL : not found
1431 * others : found, pointer to referenced SP.
1432 */
1433 static struct secpolicy *
key_getspbyid(uint32_t id)1434 key_getspbyid(uint32_t id)
1435 {
1436 SPTREE_RLOCK_TRACKER;
1437 struct secpolicy *sp;
1438
1439 SPTREE_RLOCK();
1440 LIST_FOREACH(sp, SPHASH_HASH(id), idhash) {
1441 if (sp->id == id) {
1442 SP_ADDREF(sp);
1443 break;
1444 }
1445 }
1446 SPTREE_RUNLOCK();
1447 return (sp);
1448 }
1449
1450 struct secpolicy *
key_newsp(void)1451 key_newsp(void)
1452 {
1453 struct secpolicy *sp;
1454
1455 sp = malloc(sizeof(*sp), M_IPSEC_SP, M_NOWAIT | M_ZERO);
1456 if (sp != NULL)
1457 SP_INITREF(sp);
1458 return (sp);
1459 }
1460
1461 struct ipsecrequest *
ipsec_newisr(void)1462 ipsec_newisr(void)
1463 {
1464
1465 return (malloc(sizeof(struct ipsecrequest), M_IPSEC_SR,
1466 M_NOWAIT | M_ZERO));
1467 }
1468
1469 void
ipsec_delisr(struct ipsecrequest * p)1470 ipsec_delisr(struct ipsecrequest *p)
1471 {
1472
1473 free(p, M_IPSEC_SR);
1474 }
1475
1476 /*
1477 * create secpolicy structure from sadb_x_policy structure.
1478 * NOTE: `state', `secpolicyindex' and 'id' in secpolicy structure
1479 * are not set, so must be set properly later.
1480 */
1481 struct secpolicy *
key_msg2sp(struct sadb_x_policy * xpl0,size_t len,int * error)1482 key_msg2sp(struct sadb_x_policy *xpl0, size_t len, int *error)
1483 {
1484 struct secpolicy *newsp;
1485
1486 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0"));
1487 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len));
1488
1489 if (len != PFKEY_EXTLEN(xpl0)) {
1490 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__));
1491 *error = EINVAL;
1492 return NULL;
1493 }
1494
1495 if ((newsp = key_newsp()) == NULL) {
1496 *error = ENOBUFS;
1497 return NULL;
1498 }
1499
1500 newsp->spidx.dir = xpl0->sadb_x_policy_dir;
1501 newsp->policy = xpl0->sadb_x_policy_type;
1502 newsp->priority = xpl0->sadb_x_policy_priority;
1503 newsp->tcount = 0;
1504
1505 /* check policy */
1506 switch (xpl0->sadb_x_policy_type) {
1507 case IPSEC_POLICY_DISCARD:
1508 case IPSEC_POLICY_NONE:
1509 case IPSEC_POLICY_ENTRUST:
1510 case IPSEC_POLICY_BYPASS:
1511 break;
1512
1513 case IPSEC_POLICY_IPSEC:
1514 {
1515 struct sadb_x_ipsecrequest *xisr;
1516 struct ipsecrequest *isr;
1517 int tlen;
1518
1519 /* validity check */
1520 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) {
1521 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n",
1522 __func__));
1523 key_freesp(&newsp);
1524 *error = EINVAL;
1525 return NULL;
1526 }
1527
1528 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0);
1529 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1);
1530
1531 while (tlen > 0) {
1532 /* length check */
1533 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr) ||
1534 xisr->sadb_x_ipsecrequest_len > tlen) {
1535 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest "
1536 "length.\n", __func__));
1537 key_freesp(&newsp);
1538 *error = EINVAL;
1539 return NULL;
1540 }
1541
1542 if (newsp->tcount >= IPSEC_MAXREQ) {
1543 ipseclog((LOG_DEBUG,
1544 "%s: too many ipsecrequests.\n",
1545 __func__));
1546 key_freesp(&newsp);
1547 *error = EINVAL;
1548 return (NULL);
1549 }
1550
1551 /* allocate request buffer */
1552 /* NB: data structure is zero'd */
1553 isr = ipsec_newisr();
1554 if (isr == NULL) {
1555 ipseclog((LOG_DEBUG,
1556 "%s: No more memory.\n", __func__));
1557 key_freesp(&newsp);
1558 *error = ENOBUFS;
1559 return NULL;
1560 }
1561
1562 newsp->req[newsp->tcount++] = isr;
1563
1564 /* set values */
1565 switch (xisr->sadb_x_ipsecrequest_proto) {
1566 case IPPROTO_ESP:
1567 case IPPROTO_AH:
1568 case IPPROTO_IPCOMP:
1569 break;
1570 default:
1571 ipseclog((LOG_DEBUG,
1572 "%s: invalid proto type=%u\n", __func__,
1573 xisr->sadb_x_ipsecrequest_proto));
1574 key_freesp(&newsp);
1575 *error = EPROTONOSUPPORT;
1576 return NULL;
1577 }
1578 isr->saidx.proto =
1579 (uint8_t)xisr->sadb_x_ipsecrequest_proto;
1580
1581 switch (xisr->sadb_x_ipsecrequest_mode) {
1582 case IPSEC_MODE_TRANSPORT:
1583 case IPSEC_MODE_TUNNEL:
1584 break;
1585 case IPSEC_MODE_ANY:
1586 default:
1587 ipseclog((LOG_DEBUG,
1588 "%s: invalid mode=%u\n", __func__,
1589 xisr->sadb_x_ipsecrequest_mode));
1590 key_freesp(&newsp);
1591 *error = EINVAL;
1592 return NULL;
1593 }
1594 isr->saidx.mode = xisr->sadb_x_ipsecrequest_mode;
1595
1596 switch (xisr->sadb_x_ipsecrequest_level) {
1597 case IPSEC_LEVEL_DEFAULT:
1598 case IPSEC_LEVEL_USE:
1599 case IPSEC_LEVEL_REQUIRE:
1600 break;
1601 case IPSEC_LEVEL_UNIQUE:
1602 /* validity check */
1603 /*
1604 * If range violation of reqid, kernel will
1605 * update it, don't refuse it.
1606 */
1607 if (xisr->sadb_x_ipsecrequest_reqid
1608 > IPSEC_MANUAL_REQID_MAX) {
1609 ipseclog((LOG_DEBUG,
1610 "%s: reqid=%d range "
1611 "violation, updated by kernel.\n",
1612 __func__,
1613 xisr->sadb_x_ipsecrequest_reqid));
1614 xisr->sadb_x_ipsecrequest_reqid = 0;
1615 }
1616
1617 /* allocate new reqid id if reqid is zero. */
1618 if (xisr->sadb_x_ipsecrequest_reqid == 0) {
1619 u_int32_t reqid;
1620 if ((reqid = key_newreqid()) == 0) {
1621 key_freesp(&newsp);
1622 *error = ENOBUFS;
1623 return NULL;
1624 }
1625 isr->saidx.reqid = reqid;
1626 xisr->sadb_x_ipsecrequest_reqid = reqid;
1627 } else {
1628 /* set it for manual keying. */
1629 isr->saidx.reqid =
1630 xisr->sadb_x_ipsecrequest_reqid;
1631 }
1632 break;
1633
1634 default:
1635 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n",
1636 __func__,
1637 xisr->sadb_x_ipsecrequest_level));
1638 key_freesp(&newsp);
1639 *error = EINVAL;
1640 return NULL;
1641 }
1642 isr->level = xisr->sadb_x_ipsecrequest_level;
1643
1644 /* set IP addresses if there */
1645 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
1646 struct sockaddr *paddr;
1647
1648 len = tlen - sizeof(*xisr);
1649 paddr = (struct sockaddr *)(xisr + 1);
1650 /* validity check */
1651 if (len < sizeof(struct sockaddr) ||
1652 len < 2 * paddr->sa_len ||
1653 paddr->sa_len > sizeof(isr->saidx.src)) {
1654 ipseclog((LOG_DEBUG, "%s: invalid "
1655 "request address length.\n",
1656 __func__));
1657 key_freesp(&newsp);
1658 *error = EINVAL;
1659 return NULL;
1660 }
1661 /*
1662 * Request length should be enough to keep
1663 * source and destination addresses.
1664 */
1665 if (xisr->sadb_x_ipsecrequest_len <
1666 sizeof(*xisr) + 2 * paddr->sa_len) {
1667 ipseclog((LOG_DEBUG, "%s: invalid "
1668 "ipsecrequest length.\n",
1669 __func__));
1670 key_freesp(&newsp);
1671 *error = EINVAL;
1672 return (NULL);
1673 }
1674 bcopy(paddr, &isr->saidx.src, paddr->sa_len);
1675 paddr = (struct sockaddr *)((caddr_t)paddr +
1676 paddr->sa_len);
1677
1678 /* validity check */
1679 if (paddr->sa_len !=
1680 isr->saidx.src.sa.sa_len) {
1681 ipseclog((LOG_DEBUG, "%s: invalid "
1682 "request address length.\n",
1683 __func__));
1684 key_freesp(&newsp);
1685 *error = EINVAL;
1686 return NULL;
1687 }
1688 /* AF family should match */
1689 if (paddr->sa_family !=
1690 isr->saidx.src.sa.sa_family) {
1691 ipseclog((LOG_DEBUG, "%s: address "
1692 "family doesn't match.\n",
1693 __func__));
1694 key_freesp(&newsp);
1695 *error = EINVAL;
1696 return (NULL);
1697 }
1698 bcopy(paddr, &isr->saidx.dst, paddr->sa_len);
1699 } else {
1700 /*
1701 * Addresses for TUNNEL mode requests are
1702 * mandatory.
1703 */
1704 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1705 ipseclog((LOG_DEBUG, "%s: missing "
1706 "request addresses.\n", __func__));
1707 key_freesp(&newsp);
1708 *error = EINVAL;
1709 return (NULL);
1710 }
1711 }
1712 tlen -= xisr->sadb_x_ipsecrequest_len;
1713
1714 /* validity check */
1715 if (tlen < 0) {
1716 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n",
1717 __func__));
1718 key_freesp(&newsp);
1719 *error = EINVAL;
1720 return NULL;
1721 }
1722
1723 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr
1724 + xisr->sadb_x_ipsecrequest_len);
1725 }
1726 /* XXXAE: LARVAL SP */
1727 if (newsp->tcount < 1) {
1728 ipseclog((LOG_DEBUG, "%s: valid IPSEC transforms "
1729 "not found.\n", __func__));
1730 key_freesp(&newsp);
1731 *error = EINVAL;
1732 return (NULL);
1733 }
1734 }
1735 break;
1736 default:
1737 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
1738 key_freesp(&newsp);
1739 *error = EINVAL;
1740 return NULL;
1741 }
1742
1743 *error = 0;
1744 return (newsp);
1745 }
1746
1747 uint32_t
key_newreqid(void)1748 key_newreqid(void)
1749 {
1750 static uint32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
1751
1752 if (auto_reqid == ~0)
1753 auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
1754 else
1755 auto_reqid++;
1756
1757 /* XXX should be unique check */
1758 return (auto_reqid);
1759 }
1760
1761 /*
1762 * copy secpolicy struct to sadb_x_policy structure indicated.
1763 */
1764 static struct mbuf *
key_sp2mbuf(struct secpolicy * sp)1765 key_sp2mbuf(struct secpolicy *sp)
1766 {
1767 struct mbuf *m;
1768 size_t tlen;
1769
1770 tlen = key_getspreqmsglen(sp);
1771 m = m_get2(tlen, M_NOWAIT, MT_DATA, 0);
1772 if (m == NULL)
1773 return (NULL);
1774 m_align(m, tlen);
1775 m->m_len = tlen;
1776 if (key_sp2msg(sp, m->m_data, &tlen) != 0) {
1777 m_freem(m);
1778 return (NULL);
1779 }
1780 return (m);
1781 }
1782
1783 int
key_sp2msg(struct secpolicy * sp,void * request,size_t * len)1784 key_sp2msg(struct secpolicy *sp, void *request, size_t *len)
1785 {
1786 struct sadb_x_ipsecrequest *xisr;
1787 struct sadb_x_policy *xpl;
1788 struct ipsecrequest *isr;
1789 size_t xlen, ilen;
1790 caddr_t p;
1791 int error, i;
1792
1793 IPSEC_ASSERT(sp != NULL, ("null policy"));
1794
1795 xlen = sizeof(*xpl);
1796 if (*len < xlen)
1797 return (EINVAL);
1798
1799 error = 0;
1800 bzero(request, *len);
1801 xpl = (struct sadb_x_policy *)request;
1802 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1803 xpl->sadb_x_policy_type = sp->policy;
1804 xpl->sadb_x_policy_dir = sp->spidx.dir;
1805 xpl->sadb_x_policy_id = sp->id;
1806 xpl->sadb_x_policy_priority = sp->priority;
1807 switch (sp->state) {
1808 case IPSEC_SPSTATE_IFNET:
1809 xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_IFNET;
1810 break;
1811 case IPSEC_SPSTATE_PCB:
1812 xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_PCB;
1813 break;
1814 default:
1815 xpl->sadb_x_policy_scope = IPSEC_POLICYSCOPE_GLOBAL;
1816 }
1817
1818 /* if is the policy for ipsec ? */
1819 if (sp->policy == IPSEC_POLICY_IPSEC) {
1820 p = (caddr_t)xpl + sizeof(*xpl);
1821 for (i = 0; i < sp->tcount; i++) {
1822 isr = sp->req[i];
1823 ilen = PFKEY_ALIGN8(sizeof(*xisr) +
1824 isr->saidx.src.sa.sa_len +
1825 isr->saidx.dst.sa.sa_len);
1826 xlen += ilen;
1827 if (xlen > *len) {
1828 error = ENOBUFS;
1829 /* Calculate needed size */
1830 continue;
1831 }
1832 xisr = (struct sadb_x_ipsecrequest *)p;
1833 xisr->sadb_x_ipsecrequest_len = ilen;
1834 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto;
1835 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode;
1836 xisr->sadb_x_ipsecrequest_level = isr->level;
1837 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid;
1838
1839 p += sizeof(*xisr);
1840 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len);
1841 p += isr->saidx.src.sa.sa_len;
1842 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len);
1843 p += isr->saidx.dst.sa.sa_len;
1844 }
1845 }
1846 xpl->sadb_x_policy_len = PFKEY_UNIT64(xlen);
1847 if (error == 0)
1848 *len = xlen;
1849 else
1850 *len = sizeof(*xpl);
1851 return (error);
1852 }
1853
1854 /* m will not be freed nor modified */
1855 static struct mbuf *
key_gather_mbuf(struct mbuf * m,const struct sadb_msghdr * mhp,int ndeep,int nitem,...)1856 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp,
1857 int ndeep, int nitem, ...)
1858 {
1859 va_list ap;
1860 int idx;
1861 int i;
1862 struct mbuf *result = NULL, *n;
1863 int len;
1864
1865 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1866 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
1867
1868 va_start(ap, nitem);
1869 for (i = 0; i < nitem; i++) {
1870 idx = va_arg(ap, int);
1871 if (idx < 0 || idx > SADB_EXT_MAX)
1872 goto fail;
1873 /* don't attempt to pull empty extension */
1874 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL)
1875 continue;
1876 if (idx != SADB_EXT_RESERVED &&
1877 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0))
1878 continue;
1879
1880 if (idx == SADB_EXT_RESERVED) {
1881 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
1882
1883 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len));
1884
1885 MGETHDR(n, M_NOWAIT, MT_DATA);
1886 if (!n)
1887 goto fail;
1888 n->m_len = len;
1889 n->m_next = NULL;
1890 m_copydata(m, 0, sizeof(struct sadb_msg),
1891 mtod(n, caddr_t));
1892 } else if (i < ndeep) {
1893 len = mhp->extlen[idx];
1894 n = m_get2(len, M_NOWAIT, MT_DATA, 0);
1895 if (n == NULL)
1896 goto fail;
1897 m_align(n, len);
1898 n->m_len = len;
1899 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx],
1900 mtod(n, caddr_t));
1901 } else {
1902 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx],
1903 M_NOWAIT);
1904 }
1905 if (n == NULL)
1906 goto fail;
1907
1908 if (result)
1909 m_cat(result, n);
1910 else
1911 result = n;
1912 }
1913 va_end(ap);
1914
1915 if ((result->m_flags & M_PKTHDR) != 0) {
1916 result->m_pkthdr.len = 0;
1917 for (n = result; n; n = n->m_next)
1918 result->m_pkthdr.len += n->m_len;
1919 }
1920
1921 return result;
1922
1923 fail:
1924 m_freem(result);
1925 va_end(ap);
1926 return NULL;
1927 }
1928
1929 /*
1930 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing
1931 * add an entry to SP database, when received
1932 * <base, address(SD), (lifetime(H),) policy>
1933 * from the user(?).
1934 * Adding to SP database,
1935 * and send
1936 * <base, address(SD), (lifetime(H),) policy>
1937 * to the socket which was send.
1938 *
1939 * SPDADD set a unique policy entry.
1940 * SPDSETIDX like SPDADD without a part of policy requests.
1941 * SPDUPDATE replace a unique policy entry.
1942 *
1943 * XXXAE: serialize this in PF_KEY to avoid races.
1944 * m will always be freed.
1945 */
1946 static int
key_spdadd(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)1947 key_spdadd(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
1948 {
1949 struct secpolicyindex spidx;
1950 struct sadb_address *src0, *dst0;
1951 struct sadb_x_policy *xpl0, *xpl;
1952 struct sadb_lifetime *lft = NULL;
1953 struct secpolicy *newsp;
1954 int error;
1955
1956 IPSEC_ASSERT(so != NULL, ("null socket"));
1957 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1958 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
1959 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
1960
1961 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
1962 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
1963 SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY)) {
1964 ipseclog((LOG_DEBUG,
1965 "%s: invalid message: missing required header.\n",
1966 __func__));
1967 return key_senderror(so, m, EINVAL);
1968 }
1969 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
1970 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
1971 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
1972 ipseclog((LOG_DEBUG,
1973 "%s: invalid message: wrong header size.\n", __func__));
1974 return key_senderror(so, m, EINVAL);
1975 }
1976 if (!SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD)) {
1977 if (SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_HARD)) {
1978 ipseclog((LOG_DEBUG,
1979 "%s: invalid message: wrong header size.\n",
1980 __func__));
1981 return key_senderror(so, m, EINVAL);
1982 }
1983 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
1984 }
1985
1986 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
1987 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
1988 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
1989
1990 /* check the direciton */
1991 switch (xpl0->sadb_x_policy_dir) {
1992 case IPSEC_DIR_INBOUND:
1993 case IPSEC_DIR_OUTBOUND:
1994 break;
1995 default:
1996 ipseclog((LOG_DEBUG, "%s: invalid SP direction.\n", __func__));
1997 return key_senderror(so, m, EINVAL);
1998 }
1999 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */
2000 if (xpl0->sadb_x_policy_type != IPSEC_POLICY_DISCARD &&
2001 xpl0->sadb_x_policy_type != IPSEC_POLICY_NONE &&
2002 xpl0->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
2003 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
2004 return key_senderror(so, m, EINVAL);
2005 }
2006
2007 /* policy requests are mandatory when action is ipsec. */
2008 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2009 mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) {
2010 ipseclog((LOG_DEBUG,
2011 "%s: policy requests required.\n", __func__));
2012 return key_senderror(so, m, EINVAL);
2013 }
2014
2015 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
2016 (struct sockaddr *)(dst0 + 1));
2017 if (error != 0 ||
2018 src0->sadb_address_proto != dst0->sadb_address_proto) {
2019 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
2020 return key_senderror(so, m, error);
2021 }
2022 /* make secindex */
2023 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
2024 src0 + 1,
2025 dst0 + 1,
2026 src0->sadb_address_prefixlen,
2027 dst0->sadb_address_prefixlen,
2028 src0->sadb_address_proto,
2029 &spidx);
2030 /* Checking there is SP already or not. */
2031 newsp = key_getsp(&spidx);
2032 if (newsp != NULL) {
2033 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
2034 KEYDBG(KEY_STAMP,
2035 printf("%s: unlink SP(%p) for SPDUPDATE\n",
2036 __func__, newsp));
2037 KEYDBG(KEY_DATA, kdebug_secpolicy(newsp));
2038 key_unlink(newsp);
2039 key_freesp(&newsp);
2040 } else {
2041 key_freesp(&newsp);
2042 ipseclog((LOG_DEBUG,
2043 "%s: a SP entry exists already.\n", __func__));
2044 return (key_senderror(so, m, EEXIST));
2045 }
2046 }
2047
2048 /* allocate new SP entry */
2049 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) {
2050 return key_senderror(so, m, error);
2051 }
2052
2053 newsp->lastused = newsp->created = time_second;
2054 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0;
2055 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0;
2056 bcopy(&spidx, &newsp->spidx, sizeof(spidx));
2057
2058 /* XXXAE: there is race between key_getsp() and key_insertsp() */
2059 SPTREE_WLOCK();
2060 if ((newsp->id = key_getnewspid()) == 0) {
2061 SPTREE_WUNLOCK();
2062 key_freesp(&newsp);
2063 return key_senderror(so, m, ENOBUFS);
2064 }
2065 key_insertsp(newsp);
2066 SPTREE_WUNLOCK();
2067 if (SPDCACHE_ENABLED())
2068 spdcache_clear();
2069
2070 KEYDBG(KEY_STAMP,
2071 printf("%s: SP(%p)\n", __func__, newsp));
2072 KEYDBG(KEY_DATA, kdebug_secpolicy(newsp));
2073
2074 {
2075 struct mbuf *n, *mpolicy;
2076 struct sadb_msg *newmsg;
2077 int off;
2078
2079 /* create new sadb_msg to reply. */
2080 if (lft) {
2081 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED,
2082 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD,
2083 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
2084 } else {
2085 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED,
2086 SADB_X_EXT_POLICY,
2087 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
2088 }
2089 if (!n)
2090 return key_senderror(so, m, ENOBUFS);
2091
2092 if (n->m_len < sizeof(*newmsg)) {
2093 n = m_pullup(n, sizeof(*newmsg));
2094 if (!n)
2095 return key_senderror(so, m, ENOBUFS);
2096 }
2097 newmsg = mtod(n, struct sadb_msg *);
2098 newmsg->sadb_msg_errno = 0;
2099 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2100
2101 off = 0;
2102 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)),
2103 sizeof(*xpl), &off);
2104 if (mpolicy == NULL) {
2105 /* n is already freed */
2106 return key_senderror(so, m, ENOBUFS);
2107 }
2108 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off);
2109 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
2110 m_freem(n);
2111 return key_senderror(so, m, EINVAL);
2112 }
2113 xpl->sadb_x_policy_id = newsp->id;
2114
2115 m_freem(m);
2116 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2117 }
2118 }
2119
2120 /*
2121 * get new policy id.
2122 * OUT:
2123 * 0: failure.
2124 * others: success.
2125 */
2126 static uint32_t
key_getnewspid(void)2127 key_getnewspid(void)
2128 {
2129 struct secpolicy *sp;
2130 uint32_t newid = 0;
2131 int count = V_key_spi_trycnt; /* XXX */
2132
2133 SPTREE_WLOCK_ASSERT();
2134 while (count--) {
2135 if (V_policy_id == ~0) /* overflowed */
2136 newid = V_policy_id = 1;
2137 else
2138 newid = ++V_policy_id;
2139 LIST_FOREACH(sp, SPHASH_HASH(newid), idhash) {
2140 if (sp->id == newid)
2141 break;
2142 }
2143 if (sp == NULL)
2144 break;
2145 }
2146 if (count == 0 || newid == 0) {
2147 ipseclog((LOG_DEBUG, "%s: failed to allocate policy id.\n",
2148 __func__));
2149 return (0);
2150 }
2151 return (newid);
2152 }
2153
2154 /*
2155 * SADB_SPDDELETE processing
2156 * receive
2157 * <base, address(SD), policy(*)>
2158 * from the user(?), and set SADB_SASTATE_DEAD,
2159 * and send,
2160 * <base, address(SD), policy(*)>
2161 * to the ikmpd.
2162 * policy(*) including direction of policy.
2163 *
2164 * m will always be freed.
2165 */
2166 static int
key_spddelete(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2167 key_spddelete(struct socket *so, struct mbuf *m,
2168 const struct sadb_msghdr *mhp)
2169 {
2170 struct secpolicyindex spidx;
2171 struct sadb_address *src0, *dst0;
2172 struct sadb_x_policy *xpl0;
2173 struct secpolicy *sp;
2174
2175 IPSEC_ASSERT(so != NULL, ("null so"));
2176 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2177 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2178 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2179
2180 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
2181 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
2182 SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY)) {
2183 ipseclog((LOG_DEBUG,
2184 "%s: invalid message: missing required header.\n",
2185 __func__));
2186 return key_senderror(so, m, EINVAL);
2187 }
2188 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
2189 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
2190 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
2191 ipseclog((LOG_DEBUG,
2192 "%s: invalid message: wrong header size.\n", __func__));
2193 return key_senderror(so, m, EINVAL);
2194 }
2195
2196 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
2197 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
2198 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
2199
2200 /* check the direciton */
2201 switch (xpl0->sadb_x_policy_dir) {
2202 case IPSEC_DIR_INBOUND:
2203 case IPSEC_DIR_OUTBOUND:
2204 break;
2205 default:
2206 ipseclog((LOG_DEBUG, "%s: invalid SP direction.\n", __func__));
2207 return key_senderror(so, m, EINVAL);
2208 }
2209 /* Only DISCARD, NONE and IPSEC are allowed */
2210 if (xpl0->sadb_x_policy_type != IPSEC_POLICY_DISCARD &&
2211 xpl0->sadb_x_policy_type != IPSEC_POLICY_NONE &&
2212 xpl0->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
2213 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
2214 return key_senderror(so, m, EINVAL);
2215 }
2216 if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
2217 (struct sockaddr *)(dst0 + 1)) != 0 ||
2218 src0->sadb_address_proto != dst0->sadb_address_proto) {
2219 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
2220 return key_senderror(so, m, EINVAL);
2221 }
2222 /* make secindex */
2223 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
2224 src0 + 1,
2225 dst0 + 1,
2226 src0->sadb_address_prefixlen,
2227 dst0->sadb_address_prefixlen,
2228 src0->sadb_address_proto,
2229 &spidx);
2230
2231 /* Is there SP in SPD ? */
2232 if ((sp = key_getsp(&spidx)) == NULL) {
2233 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__));
2234 return key_senderror(so, m, EINVAL);
2235 }
2236
2237 /* save policy id to buffer to be returned. */
2238 xpl0->sadb_x_policy_id = sp->id;
2239
2240 KEYDBG(KEY_STAMP,
2241 printf("%s: SP(%p)\n", __func__, sp));
2242 KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
2243 key_unlink(sp);
2244 key_freesp(&sp);
2245
2246 {
2247 struct mbuf *n;
2248 struct sadb_msg *newmsg;
2249
2250 /* create new sadb_msg to reply. */
2251 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
2252 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
2253 if (!n)
2254 return key_senderror(so, m, ENOBUFS);
2255
2256 newmsg = mtod(n, struct sadb_msg *);
2257 newmsg->sadb_msg_errno = 0;
2258 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2259
2260 m_freem(m);
2261 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2262 }
2263 }
2264
2265 /*
2266 * SADB_SPDDELETE2 processing
2267 * receive
2268 * <base, policy(*)>
2269 * from the user(?), and set SADB_SASTATE_DEAD,
2270 * and send,
2271 * <base, policy(*)>
2272 * to the ikmpd.
2273 * policy(*) including direction of policy.
2274 *
2275 * m will always be freed.
2276 */
2277 static int
key_spddelete2(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2278 key_spddelete2(struct socket *so, struct mbuf *m,
2279 const struct sadb_msghdr *mhp)
2280 {
2281 struct secpolicy *sp;
2282 uint32_t id;
2283
2284 IPSEC_ASSERT(so != NULL, ("null socket"));
2285 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2286 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2287 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2288
2289 if (SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY) ||
2290 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
2291 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
2292 __func__));
2293 return key_senderror(so, m, EINVAL);
2294 }
2295
2296 id = ((struct sadb_x_policy *)
2297 mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2298
2299 /* Is there SP in SPD ? */
2300 if ((sp = key_getspbyid(id)) == NULL) {
2301 ipseclog((LOG_DEBUG, "%s: no SP found for id %u.\n",
2302 __func__, id));
2303 return key_senderror(so, m, EINVAL);
2304 }
2305
2306 KEYDBG(KEY_STAMP,
2307 printf("%s: SP(%p)\n", __func__, sp));
2308 KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
2309 key_unlink(sp);
2310 if (sp->state != IPSEC_SPSTATE_DEAD) {
2311 ipseclog((LOG_DEBUG, "%s: failed to delete SP with id %u.\n",
2312 __func__, id));
2313 key_freesp(&sp);
2314 return (key_senderror(so, m, EACCES));
2315 }
2316 key_freesp(&sp);
2317
2318 {
2319 struct mbuf *n, *nn;
2320 struct sadb_msg *newmsg;
2321 int off, len;
2322
2323 /* create new sadb_msg to reply. */
2324 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2325
2326 MGETHDR(n, M_NOWAIT, MT_DATA);
2327 if (n && len > MHLEN) {
2328 if (!(MCLGET(n, M_NOWAIT))) {
2329 m_freem(n);
2330 n = NULL;
2331 }
2332 }
2333 if (!n)
2334 return key_senderror(so, m, ENOBUFS);
2335
2336 n->m_len = len;
2337 n->m_next = NULL;
2338 off = 0;
2339
2340 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
2341 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
2342
2343 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)",
2344 off, len));
2345
2346 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY],
2347 mhp->extlen[SADB_X_EXT_POLICY], M_NOWAIT);
2348 if (!n->m_next) {
2349 m_freem(n);
2350 return key_senderror(so, m, ENOBUFS);
2351 }
2352
2353 n->m_pkthdr.len = 0;
2354 for (nn = n; nn; nn = nn->m_next)
2355 n->m_pkthdr.len += nn->m_len;
2356
2357 newmsg = mtod(n, struct sadb_msg *);
2358 newmsg->sadb_msg_errno = 0;
2359 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2360
2361 m_freem(m);
2362 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2363 }
2364 }
2365
2366 /*
2367 * SADB_X_SPDGET processing
2368 * receive
2369 * <base, policy(*)>
2370 * from the user(?),
2371 * and send,
2372 * <base, address(SD), policy>
2373 * to the ikmpd.
2374 * policy(*) including direction of policy.
2375 *
2376 * m will always be freed.
2377 */
2378 static int
key_spdget(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2379 key_spdget(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2380 {
2381 struct secpolicy *sp;
2382 struct mbuf *n;
2383 uint32_t id;
2384
2385 IPSEC_ASSERT(so != NULL, ("null socket"));
2386 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2387 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2388 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2389
2390 if (SADB_CHECKHDR(mhp, SADB_X_EXT_POLICY) ||
2391 SADB_CHECKLEN(mhp, SADB_X_EXT_POLICY)) {
2392 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
2393 __func__));
2394 return key_senderror(so, m, EINVAL);
2395 }
2396
2397 id = ((struct sadb_x_policy *)
2398 mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2399
2400 /* Is there SP in SPD ? */
2401 if ((sp = key_getspbyid(id)) == NULL) {
2402 ipseclog((LOG_DEBUG, "%s: no SP found for id %u.\n",
2403 __func__, id));
2404 return key_senderror(so, m, ENOENT);
2405 }
2406
2407 n = key_setdumpsp(sp, SADB_X_SPDGET, mhp->msg->sadb_msg_seq,
2408 mhp->msg->sadb_msg_pid);
2409 key_freesp(&sp);
2410 if (n != NULL) {
2411 m_freem(m);
2412 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2413 } else
2414 return key_senderror(so, m, ENOBUFS);
2415 }
2416
2417 /*
2418 * SADB_X_SPDACQUIRE processing.
2419 * Acquire policy and SA(s) for a *OUTBOUND* packet.
2420 * send
2421 * <base, policy(*)>
2422 * to KMD, and expect to receive
2423 * <base> with SADB_X_SPDACQUIRE if error occurred,
2424 * or
2425 * <base, policy>
2426 * with SADB_X_SPDUPDATE from KMD by PF_KEY.
2427 * policy(*) is without policy requests.
2428 *
2429 * 0 : succeed
2430 * others: error number
2431 */
2432 int
key_spdacquire(struct secpolicy * sp)2433 key_spdacquire(struct secpolicy *sp)
2434 {
2435 struct mbuf *result = NULL, *m;
2436 struct secspacq *newspacq;
2437
2438 IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
2439 IPSEC_ASSERT(sp->req == NULL, ("policy exists"));
2440 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
2441 ("policy not IPSEC %u", sp->policy));
2442
2443 /* Get an entry to check whether sent message or not. */
2444 newspacq = key_getspacq(&sp->spidx);
2445 if (newspacq != NULL) {
2446 if (V_key_blockacq_count < newspacq->count) {
2447 /* reset counter and do send message. */
2448 newspacq->count = 0;
2449 } else {
2450 /* increment counter and do nothing. */
2451 newspacq->count++;
2452 SPACQ_UNLOCK();
2453 return (0);
2454 }
2455 SPACQ_UNLOCK();
2456 } else {
2457 /* make new entry for blocking to send SADB_ACQUIRE. */
2458 newspacq = key_newspacq(&sp->spidx);
2459 if (newspacq == NULL)
2460 return ENOBUFS;
2461 }
2462
2463 /* create new sadb_msg to reply. */
2464 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0);
2465 if (!m)
2466 return ENOBUFS;
2467
2468 result = m;
2469
2470 result->m_pkthdr.len = 0;
2471 for (m = result; m; m = m->m_next)
2472 result->m_pkthdr.len += m->m_len;
2473
2474 mtod(result, struct sadb_msg *)->sadb_msg_len =
2475 PFKEY_UNIT64(result->m_pkthdr.len);
2476
2477 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED);
2478 }
2479
2480 /*
2481 * SADB_SPDFLUSH processing
2482 * receive
2483 * <base>
2484 * from the user, and free all entries in secpctree.
2485 * and send,
2486 * <base>
2487 * to the user.
2488 * NOTE: what to do is only marking SADB_SASTATE_DEAD.
2489 *
2490 * m will always be freed.
2491 */
2492 static int
key_spdflush(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2493 key_spdflush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2494 {
2495 struct secpolicy_queue drainq;
2496 struct sadb_msg *newmsg;
2497 struct secpolicy *sp, *nextsp;
2498 u_int dir;
2499
2500 IPSEC_ASSERT(so != NULL, ("null socket"));
2501 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2502 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2503 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2504
2505 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg)))
2506 return key_senderror(so, m, EINVAL);
2507
2508 TAILQ_INIT(&drainq);
2509 SPTREE_WLOCK();
2510 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2511 TAILQ_CONCAT(&drainq, &V_sptree[dir], chain);
2512 }
2513 /*
2514 * We need to set state to DEAD for each policy to be sure,
2515 * that another thread won't try to unlink it.
2516 * Also remove SP from sphash.
2517 */
2518 TAILQ_FOREACH(sp, &drainq, chain) {
2519 sp->state = IPSEC_SPSTATE_DEAD;
2520 LIST_REMOVE(sp, idhash);
2521 }
2522 V_sp_genid++;
2523 V_spd_size = 0;
2524 SPTREE_WUNLOCK();
2525 if (SPDCACHE_ENABLED())
2526 spdcache_clear();
2527 sp = TAILQ_FIRST(&drainq);
2528 while (sp != NULL) {
2529 nextsp = TAILQ_NEXT(sp, chain);
2530 key_freesp(&sp);
2531 sp = nextsp;
2532 }
2533
2534 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
2535 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
2536 return key_senderror(so, m, ENOBUFS);
2537 }
2538
2539 if (m->m_next)
2540 m_freem(m->m_next);
2541 m->m_next = NULL;
2542 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2543 newmsg = mtod(m, struct sadb_msg *);
2544 newmsg->sadb_msg_errno = 0;
2545 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
2546
2547 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
2548 }
2549
2550 static uint8_t
key_satype2scopemask(uint8_t satype)2551 key_satype2scopemask(uint8_t satype)
2552 {
2553
2554 if (satype == IPSEC_POLICYSCOPE_ANY)
2555 return (0xff);
2556 return (satype);
2557 }
2558 /*
2559 * SADB_SPDDUMP processing
2560 * receive
2561 * <base>
2562 * from the user, and dump all SP leaves and send,
2563 * <base> .....
2564 * to the ikmpd.
2565 *
2566 * NOTE:
2567 * sadb_msg_satype is considered as mask of policy scopes.
2568 * m will always be freed.
2569 */
2570 static int
key_spddump(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)2571 key_spddump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2572 {
2573 SPTREE_RLOCK_TRACKER;
2574 struct secpolicy *sp;
2575 struct mbuf *n;
2576 int cnt;
2577 u_int dir, scope;
2578
2579 IPSEC_ASSERT(so != NULL, ("null socket"));
2580 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2581 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2582 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2583
2584 /* search SPD entry and get buffer size. */
2585 cnt = 0;
2586 scope = key_satype2scopemask(mhp->msg->sadb_msg_satype);
2587 SPTREE_RLOCK();
2588 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2589 if (scope & IPSEC_POLICYSCOPE_GLOBAL) {
2590 TAILQ_FOREACH(sp, &V_sptree[dir], chain)
2591 cnt++;
2592 }
2593 if (scope & IPSEC_POLICYSCOPE_IFNET) {
2594 TAILQ_FOREACH(sp, &V_sptree_ifnet[dir], chain)
2595 cnt++;
2596 }
2597 }
2598
2599 if (cnt == 0) {
2600 SPTREE_RUNLOCK();
2601 return key_senderror(so, m, ENOENT);
2602 }
2603
2604 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2605 if (scope & IPSEC_POLICYSCOPE_GLOBAL) {
2606 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
2607 --cnt;
2608 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
2609 mhp->msg->sadb_msg_pid);
2610
2611 if (n != NULL)
2612 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2613 }
2614 }
2615 if (scope & IPSEC_POLICYSCOPE_IFNET) {
2616 TAILQ_FOREACH(sp, &V_sptree_ifnet[dir], chain) {
2617 --cnt;
2618 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
2619 mhp->msg->sadb_msg_pid);
2620
2621 if (n != NULL)
2622 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2623 }
2624 }
2625 }
2626
2627 SPTREE_RUNLOCK();
2628 m_freem(m);
2629 return (0);
2630 }
2631
2632 static struct mbuf *
key_setdumpsp(struct secpolicy * sp,u_int8_t type,u_int32_t seq,u_int32_t pid)2633 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq,
2634 u_int32_t pid)
2635 {
2636 struct mbuf *result = NULL, *m;
2637 struct seclifetime lt;
2638
2639 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt);
2640 if (!m)
2641 goto fail;
2642 result = m;
2643
2644 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2645 &sp->spidx.src.sa, sp->spidx.prefs,
2646 sp->spidx.ul_proto);
2647 if (!m)
2648 goto fail;
2649 m_cat(result, m);
2650
2651 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2652 &sp->spidx.dst.sa, sp->spidx.prefd,
2653 sp->spidx.ul_proto);
2654 if (!m)
2655 goto fail;
2656 m_cat(result, m);
2657
2658 m = key_sp2mbuf(sp);
2659 if (!m)
2660 goto fail;
2661 m_cat(result, m);
2662
2663 if(sp->lifetime){
2664 lt.addtime=sp->created;
2665 lt.usetime= sp->lastused;
2666 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT);
2667 if (!m)
2668 goto fail;
2669 m_cat(result, m);
2670
2671 lt.addtime=sp->lifetime;
2672 lt.usetime= sp->validtime;
2673 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD);
2674 if (!m)
2675 goto fail;
2676 m_cat(result, m);
2677 }
2678
2679 if ((result->m_flags & M_PKTHDR) == 0)
2680 goto fail;
2681
2682 if (result->m_len < sizeof(struct sadb_msg)) {
2683 result = m_pullup(result, sizeof(struct sadb_msg));
2684 if (result == NULL)
2685 goto fail;
2686 }
2687
2688 result->m_pkthdr.len = 0;
2689 for (m = result; m; m = m->m_next)
2690 result->m_pkthdr.len += m->m_len;
2691
2692 mtod(result, struct sadb_msg *)->sadb_msg_len =
2693 PFKEY_UNIT64(result->m_pkthdr.len);
2694
2695 return result;
2696
2697 fail:
2698 m_freem(result);
2699 return NULL;
2700 }
2701 /*
2702 * get PFKEY message length for security policy and request.
2703 */
2704 static size_t
key_getspreqmsglen(struct secpolicy * sp)2705 key_getspreqmsglen(struct secpolicy *sp)
2706 {
2707 size_t tlen, len;
2708 int i;
2709
2710 tlen = sizeof(struct sadb_x_policy);
2711 /* if is the policy for ipsec ? */
2712 if (sp->policy != IPSEC_POLICY_IPSEC)
2713 return (tlen);
2714
2715 /* get length of ipsec requests */
2716 for (i = 0; i < sp->tcount; i++) {
2717 len = sizeof(struct sadb_x_ipsecrequest)
2718 + sp->req[i]->saidx.src.sa.sa_len
2719 + sp->req[i]->saidx.dst.sa.sa_len;
2720
2721 tlen += PFKEY_ALIGN8(len);
2722 }
2723 return (tlen);
2724 }
2725
2726 /*
2727 * SADB_SPDEXPIRE processing
2728 * send
2729 * <base, address(SD), lifetime(CH), policy>
2730 * to KMD by PF_KEY.
2731 *
2732 * OUT: 0 : succeed
2733 * others : error number
2734 */
2735 static int
key_spdexpire(struct secpolicy * sp)2736 key_spdexpire(struct secpolicy *sp)
2737 {
2738 struct sadb_lifetime *lt;
2739 struct mbuf *result = NULL, *m;
2740 int len, error = -1;
2741
2742 IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
2743
2744 KEYDBG(KEY_STAMP,
2745 printf("%s: SP(%p)\n", __func__, sp));
2746 KEYDBG(KEY_DATA, kdebug_secpolicy(sp));
2747
2748 /* set msg header */
2749 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0);
2750 if (!m) {
2751 error = ENOBUFS;
2752 goto fail;
2753 }
2754 result = m;
2755
2756 /* create lifetime extension (current and hard) */
2757 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
2758 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
2759 if (m == NULL) {
2760 error = ENOBUFS;
2761 goto fail;
2762 }
2763 m_align(m, len);
2764 m->m_len = len;
2765 bzero(mtod(m, caddr_t), len);
2766 lt = mtod(m, struct sadb_lifetime *);
2767 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2768 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2769 lt->sadb_lifetime_allocations = 0;
2770 lt->sadb_lifetime_bytes = 0;
2771 lt->sadb_lifetime_addtime = sp->created;
2772 lt->sadb_lifetime_usetime = sp->lastused;
2773 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
2774 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2775 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2776 lt->sadb_lifetime_allocations = 0;
2777 lt->sadb_lifetime_bytes = 0;
2778 lt->sadb_lifetime_addtime = sp->lifetime;
2779 lt->sadb_lifetime_usetime = sp->validtime;
2780 m_cat(result, m);
2781
2782 /* set sadb_address for source */
2783 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2784 &sp->spidx.src.sa,
2785 sp->spidx.prefs, sp->spidx.ul_proto);
2786 if (!m) {
2787 error = ENOBUFS;
2788 goto fail;
2789 }
2790 m_cat(result, m);
2791
2792 /* set sadb_address for destination */
2793 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2794 &sp->spidx.dst.sa,
2795 sp->spidx.prefd, sp->spidx.ul_proto);
2796 if (!m) {
2797 error = ENOBUFS;
2798 goto fail;
2799 }
2800 m_cat(result, m);
2801
2802 /* set secpolicy */
2803 m = key_sp2mbuf(sp);
2804 if (!m) {
2805 error = ENOBUFS;
2806 goto fail;
2807 }
2808 m_cat(result, m);
2809
2810 if ((result->m_flags & M_PKTHDR) == 0) {
2811 error = EINVAL;
2812 goto fail;
2813 }
2814
2815 if (result->m_len < sizeof(struct sadb_msg)) {
2816 result = m_pullup(result, sizeof(struct sadb_msg));
2817 if (result == NULL) {
2818 error = ENOBUFS;
2819 goto fail;
2820 }
2821 }
2822
2823 result->m_pkthdr.len = 0;
2824 for (m = result; m; m = m->m_next)
2825 result->m_pkthdr.len += m->m_len;
2826
2827 mtod(result, struct sadb_msg *)->sadb_msg_len =
2828 PFKEY_UNIT64(result->m_pkthdr.len);
2829
2830 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
2831
2832 fail:
2833 if (result)
2834 m_freem(result);
2835 return error;
2836 }
2837
2838 /* %%% SAD management */
2839 /*
2840 * allocating and initialize new SA head.
2841 * OUT: NULL : failure due to the lack of memory.
2842 * others : pointer to new SA head.
2843 */
2844 static struct secashead *
key_newsah(struct secasindex * saidx)2845 key_newsah(struct secasindex *saidx)
2846 {
2847 struct secashead *sah;
2848
2849 sah = malloc(sizeof(struct secashead), M_IPSEC_SAH,
2850 M_NOWAIT | M_ZERO);
2851 if (sah == NULL) {
2852 PFKEYSTAT_INC(in_nomem);
2853 return (NULL);
2854 }
2855 TAILQ_INIT(&sah->savtree_larval);
2856 TAILQ_INIT(&sah->savtree_alive);
2857 sah->saidx = *saidx;
2858 sah->state = SADB_SASTATE_DEAD;
2859 SAH_INITREF(sah);
2860
2861 KEYDBG(KEY_STAMP,
2862 printf("%s: SAH(%p)\n", __func__, sah));
2863 KEYDBG(KEY_DATA, kdebug_secash(sah, NULL));
2864 return (sah);
2865 }
2866
2867 static void
key_freesah(struct secashead ** psah)2868 key_freesah(struct secashead **psah)
2869 {
2870 struct secashead *sah = *psah;
2871
2872 if (SAH_DELREF(sah) == 0)
2873 return;
2874
2875 KEYDBG(KEY_STAMP,
2876 printf("%s: last reference to SAH(%p)\n", __func__, sah));
2877 KEYDBG(KEY_DATA, kdebug_secash(sah, NULL));
2878
2879 *psah = NULL;
2880 key_delsah(sah);
2881 }
2882
2883 static void
key_delsah(struct secashead * sah)2884 key_delsah(struct secashead *sah)
2885 {
2886 IPSEC_ASSERT(sah != NULL, ("NULL sah"));
2887 IPSEC_ASSERT(sah->state == SADB_SASTATE_DEAD,
2888 ("Attempt to free non DEAD SAH %p", sah));
2889 IPSEC_ASSERT(TAILQ_EMPTY(&sah->savtree_larval),
2890 ("Attempt to free SAH %p with LARVAL SA", sah));
2891 IPSEC_ASSERT(TAILQ_EMPTY(&sah->savtree_alive),
2892 ("Attempt to free SAH %p with ALIVE SA", sah));
2893
2894 free(sah, M_IPSEC_SAH);
2895 }
2896
2897 /*
2898 * allocating a new SA for key_add() and key_getspi() call,
2899 * and copy the values of mhp into new buffer.
2900 * When SAD message type is SADB_GETSPI set SA state to LARVAL.
2901 * For SADB_ADD create and initialize SA with MATURE state.
2902 * OUT: NULL : fail
2903 * others : pointer to new secasvar.
2904 */
2905 static struct secasvar *
key_newsav(const struct sadb_msghdr * mhp,struct secasindex * saidx,uint32_t spi,int * errp)2906 key_newsav(const struct sadb_msghdr *mhp, struct secasindex *saidx,
2907 uint32_t spi, int *errp)
2908 {
2909 struct secashead *sah;
2910 struct secasvar *sav;
2911 int isnew;
2912
2913 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2914 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2915 IPSEC_ASSERT(mhp->msg->sadb_msg_type == SADB_GETSPI ||
2916 mhp->msg->sadb_msg_type == SADB_ADD, ("wrong message type"));
2917
2918 sav = NULL;
2919 sah = NULL;
2920 /* check SPI value */
2921 switch (saidx->proto) {
2922 case IPPROTO_ESP:
2923 case IPPROTO_AH:
2924 /*
2925 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values
2926 * 1-255 reserved by IANA for future use,
2927 * 0 for implementation specific, local use.
2928 */
2929 if (ntohl(spi) <= 255) {
2930 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n",
2931 __func__, ntohl(spi)));
2932 *errp = EINVAL;
2933 goto done;
2934 }
2935 break;
2936 }
2937
2938 sav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT | M_ZERO);
2939 if (sav == NULL) {
2940 *errp = ENOBUFS;
2941 goto done;
2942 }
2943 sav->lock = malloc(sizeof(struct mtx), M_IPSEC_MISC,
2944 M_NOWAIT | M_ZERO);
2945 if (sav->lock == NULL) {
2946 *errp = ENOBUFS;
2947 goto done;
2948 }
2949 mtx_init(sav->lock, "ipsec association", NULL, MTX_DEF);
2950 sav->lft_c = uma_zalloc_pcpu(V_key_lft_zone, M_NOWAIT);
2951 if (sav->lft_c == NULL) {
2952 *errp = ENOBUFS;
2953 goto done;
2954 }
2955 counter_u64_zero(sav->lft_c_allocations);
2956 counter_u64_zero(sav->lft_c_bytes);
2957
2958 sav->spi = spi;
2959 sav->seq = mhp->msg->sadb_msg_seq;
2960 sav->state = SADB_SASTATE_LARVAL;
2961 sav->pid = (pid_t)mhp->msg->sadb_msg_pid;
2962 SAV_INITREF(sav);
2963 again:
2964 sah = key_getsah(saidx);
2965 if (sah == NULL) {
2966 /* create a new SA index */
2967 sah = key_newsah(saidx);
2968 if (sah == NULL) {
2969 ipseclog((LOG_DEBUG,
2970 "%s: No more memory.\n", __func__));
2971 *errp = ENOBUFS;
2972 goto done;
2973 }
2974 isnew = 1;
2975 } else
2976 isnew = 0;
2977
2978 sav->sah = sah;
2979 if (mhp->msg->sadb_msg_type == SADB_GETSPI) {
2980 sav->created = time_second;
2981 } else if (sav->state == SADB_SASTATE_LARVAL) {
2982 /*
2983 * Do not call key_setsaval() second time in case
2984 * of `goto again`. We will have MATURE state.
2985 */
2986 *errp = key_setsaval(sav, mhp);
2987 if (*errp != 0)
2988 goto done;
2989 sav->state = SADB_SASTATE_MATURE;
2990 }
2991
2992 SAHTREE_WLOCK();
2993 /*
2994 * Check that existing SAH wasn't unlinked.
2995 * Since we didn't hold the SAHTREE lock, it is possible,
2996 * that callout handler or key_flush() or key_delete() could
2997 * unlink this SAH.
2998 */
2999 if (isnew == 0 && sah->state == SADB_SASTATE_DEAD) {
3000 SAHTREE_WUNLOCK();
3001 key_freesah(&sah); /* reference from key_getsah() */
3002 goto again;
3003 }
3004 if (isnew != 0) {
3005 /*
3006 * Add new SAH into SADB.
3007 *
3008 * XXXAE: we can serialize key_add and key_getspi calls, so
3009 * several threads will not fight in the race.
3010 * Otherwise we should check under SAHTREE lock, that this
3011 * SAH would not added twice.
3012 */
3013 TAILQ_INSERT_HEAD(&V_sahtree, sah, chain);
3014 /* Add new SAH into hash by addresses */
3015 LIST_INSERT_HEAD(SAHADDRHASH_HASH(saidx), sah, addrhash);
3016 /* Now we are linked in the chain */
3017 sah->state = SADB_SASTATE_MATURE;
3018 /*
3019 * SAV references this new SAH.
3020 * In case of existing SAH we reuse reference
3021 * from key_getsah().
3022 */
3023 SAH_ADDREF(sah);
3024 }
3025 /* Link SAV with SAH */
3026 if (sav->state == SADB_SASTATE_MATURE)
3027 TAILQ_INSERT_HEAD(&sah->savtree_alive, sav, chain);
3028 else
3029 TAILQ_INSERT_HEAD(&sah->savtree_larval, sav, chain);
3030 /* Add SAV into SPI hash */
3031 LIST_INSERT_HEAD(SAVHASH_HASH(sav->spi), sav, spihash);
3032 SAHTREE_WUNLOCK();
3033 *errp = 0; /* success */
3034 done:
3035 if (*errp != 0) {
3036 if (sav != NULL) {
3037 if (sav->lock != NULL) {
3038 mtx_destroy(sav->lock);
3039 free(sav->lock, M_IPSEC_MISC);
3040 }
3041 if (sav->lft_c != NULL)
3042 uma_zfree_pcpu(V_key_lft_zone, sav->lft_c);
3043 free(sav, M_IPSEC_SA), sav = NULL;
3044 }
3045 if (sah != NULL)
3046 key_freesah(&sah);
3047 if (*errp == ENOBUFS) {
3048 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3049 __func__));
3050 PFKEYSTAT_INC(in_nomem);
3051 }
3052 }
3053 return (sav);
3054 }
3055
3056 /*
3057 * free() SA variable entry.
3058 */
3059 static void
key_cleansav(struct secasvar * sav)3060 key_cleansav(struct secasvar *sav)
3061 {
3062
3063 if (sav->natt != NULL) {
3064 free(sav->natt, M_IPSEC_MISC);
3065 sav->natt = NULL;
3066 }
3067 if (sav->flags & SADB_X_EXT_F_CLONED)
3068 return;
3069 /*
3070 * Cleanup xform state. Note that zeroize'ing causes the
3071 * keys to be cleared; otherwise we must do it ourself.
3072 */
3073 if (sav->tdb_xform != NULL) {
3074 sav->tdb_xform->xf_zeroize(sav);
3075 sav->tdb_xform = NULL;
3076 } else {
3077 if (sav->key_auth != NULL)
3078 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
3079 if (sav->key_enc != NULL)
3080 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc));
3081 }
3082 if (sav->key_auth != NULL) {
3083 if (sav->key_auth->key_data != NULL)
3084 free(sav->key_auth->key_data, M_IPSEC_MISC);
3085 free(sav->key_auth, M_IPSEC_MISC);
3086 sav->key_auth = NULL;
3087 }
3088 if (sav->key_enc != NULL) {
3089 if (sav->key_enc->key_data != NULL)
3090 free(sav->key_enc->key_data, M_IPSEC_MISC);
3091 free(sav->key_enc, M_IPSEC_MISC);
3092 sav->key_enc = NULL;
3093 }
3094 if (sav->replay != NULL) {
3095 if (sav->replay->bitmap != NULL)
3096 free(sav->replay->bitmap, M_IPSEC_MISC);
3097 free(sav->replay, M_IPSEC_MISC);
3098 sav->replay = NULL;
3099 }
3100 if (sav->lft_h != NULL) {
3101 free(sav->lft_h, M_IPSEC_MISC);
3102 sav->lft_h = NULL;
3103 }
3104 if (sav->lft_s != NULL) {
3105 free(sav->lft_s, M_IPSEC_MISC);
3106 sav->lft_s = NULL;
3107 }
3108 }
3109
3110 /*
3111 * free() SA variable entry.
3112 */
3113 static void
key_delsav(struct secasvar * sav)3114 key_delsav(struct secasvar *sav)
3115 {
3116 IPSEC_ASSERT(sav != NULL, ("null sav"));
3117 IPSEC_ASSERT(sav->state == SADB_SASTATE_DEAD,
3118 ("attempt to free non DEAD SA %p", sav));
3119 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0",
3120 sav->refcnt));
3121
3122 /*
3123 * SA must be unlinked from the chain and hashtbl.
3124 * If SA was cloned, we leave all fields untouched,
3125 * except NAT-T config.
3126 */
3127 key_cleansav(sav);
3128 if ((sav->flags & SADB_X_EXT_F_CLONED) == 0) {
3129 mtx_destroy(sav->lock);
3130 free(sav->lock, M_IPSEC_MISC);
3131 uma_zfree(V_key_lft_zone, sav->lft_c);
3132 }
3133 free(sav, M_IPSEC_SA);
3134 }
3135
3136 /*
3137 * search SAH.
3138 * OUT:
3139 * NULL : not found
3140 * others : found, referenced pointer to a SAH.
3141 */
3142 static struct secashead *
key_getsah(struct secasindex * saidx)3143 key_getsah(struct secasindex *saidx)
3144 {
3145 SAHTREE_RLOCK_TRACKER;
3146 struct secashead *sah;
3147
3148 SAHTREE_RLOCK();
3149 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
3150 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID) != 0) {
3151 SAH_ADDREF(sah);
3152 break;
3153 }
3154 }
3155 SAHTREE_RUNLOCK();
3156 return (sah);
3157 }
3158
3159 /*
3160 * Check not to be duplicated SPI.
3161 * OUT:
3162 * 0 : not found
3163 * 1 : found SA with given SPI.
3164 */
3165 static int
key_checkspidup(uint32_t spi)3166 key_checkspidup(uint32_t spi)
3167 {
3168 SAHTREE_RLOCK_TRACKER;
3169 struct secasvar *sav;
3170
3171 /* Assume SPI is in network byte order */
3172 SAHTREE_RLOCK();
3173 LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
3174 if (sav->spi == spi)
3175 break;
3176 }
3177 SAHTREE_RUNLOCK();
3178 return (sav != NULL);
3179 }
3180
3181 /*
3182 * Search SA by SPI.
3183 * OUT:
3184 * NULL : not found
3185 * others : found, referenced pointer to a SA.
3186 */
3187 static struct secasvar *
key_getsavbyspi(uint32_t spi)3188 key_getsavbyspi(uint32_t spi)
3189 {
3190 SAHTREE_RLOCK_TRACKER;
3191 struct secasvar *sav;
3192
3193 /* Assume SPI is in network byte order */
3194 SAHTREE_RLOCK();
3195 LIST_FOREACH(sav, SAVHASH_HASH(spi), spihash) {
3196 if (sav->spi != spi)
3197 continue;
3198 SAV_ADDREF(sav);
3199 break;
3200 }
3201 SAHTREE_RUNLOCK();
3202 return (sav);
3203 }
3204
3205 static int
key_updatelifetimes(struct secasvar * sav,const struct sadb_msghdr * mhp)3206 key_updatelifetimes(struct secasvar *sav, const struct sadb_msghdr *mhp)
3207 {
3208 struct seclifetime *lft_h, *lft_s, *tmp;
3209
3210 /* Lifetime extension is optional, check that it is present. */
3211 if (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
3212 SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) {
3213 /*
3214 * In case of SADB_UPDATE we may need to change
3215 * existing lifetimes.
3216 */
3217 if (sav->state == SADB_SASTATE_MATURE) {
3218 lft_h = lft_s = NULL;
3219 goto reset;
3220 }
3221 return (0);
3222 }
3223 /* Both HARD and SOFT extensions must present */
3224 if ((SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
3225 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
3226 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
3227 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
3228 ipseclog((LOG_DEBUG,
3229 "%s: invalid message: missing required header.\n",
3230 __func__));
3231 return (EINVAL);
3232 }
3233 if (SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_HARD) ||
3234 SADB_CHECKLEN(mhp, SADB_EXT_LIFETIME_SOFT)) {
3235 ipseclog((LOG_DEBUG,
3236 "%s: invalid message: wrong header size.\n", __func__));
3237 return (EINVAL);
3238 }
3239 lft_h = key_dup_lifemsg((const struct sadb_lifetime *)
3240 mhp->ext[SADB_EXT_LIFETIME_HARD], M_IPSEC_MISC);
3241 if (lft_h == NULL) {
3242 PFKEYSTAT_INC(in_nomem);
3243 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
3244 return (ENOBUFS);
3245 }
3246 lft_s = key_dup_lifemsg((const struct sadb_lifetime *)
3247 mhp->ext[SADB_EXT_LIFETIME_SOFT], M_IPSEC_MISC);
3248 if (lft_s == NULL) {
3249 PFKEYSTAT_INC(in_nomem);
3250 free(lft_h, M_IPSEC_MISC);
3251 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
3252 return (ENOBUFS);
3253 }
3254 reset:
3255 if (sav->state != SADB_SASTATE_LARVAL) {
3256 /*
3257 * key_update() holds reference to this SA,
3258 * so it won't be deleted in meanwhile.
3259 */
3260 SECASVAR_LOCK(sav);
3261 tmp = sav->lft_h;
3262 sav->lft_h = lft_h;
3263 lft_h = tmp;
3264
3265 tmp = sav->lft_s;
3266 sav->lft_s = lft_s;
3267 lft_s = tmp;
3268 SECASVAR_UNLOCK(sav);
3269 if (lft_h != NULL)
3270 free(lft_h, M_IPSEC_MISC);
3271 if (lft_s != NULL)
3272 free(lft_s, M_IPSEC_MISC);
3273 return (0);
3274 }
3275 /* We can update lifetime without holding a lock */
3276 IPSEC_ASSERT(sav->lft_h == NULL, ("lft_h is already initialized\n"));
3277 IPSEC_ASSERT(sav->lft_s == NULL, ("lft_s is already initialized\n"));
3278 sav->lft_h = lft_h;
3279 sav->lft_s = lft_s;
3280 return (0);
3281 }
3282
3283 /*
3284 * copy SA values from PF_KEY message except *SPI, SEQ, PID and TYPE*.
3285 * You must update these if need. Expects only LARVAL SAs.
3286 * OUT: 0: success.
3287 * !0: failure.
3288 */
3289 static int
key_setsaval(struct secasvar * sav,const struct sadb_msghdr * mhp)3290 key_setsaval(struct secasvar *sav, const struct sadb_msghdr *mhp)
3291 {
3292 const struct sadb_sa *sa0;
3293 const struct sadb_key *key0;
3294 uint32_t replay;
3295 size_t len;
3296 int error;
3297
3298 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
3299 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
3300 IPSEC_ASSERT(sav->state == SADB_SASTATE_LARVAL,
3301 ("Attempt to update non LARVAL SA"));
3302
3303 /* XXX rewrite */
3304 error = key_setident(sav->sah, mhp);
3305 if (error != 0)
3306 goto fail;
3307
3308 /* SA */
3309 if (!SADB_CHECKHDR(mhp, SADB_EXT_SA)) {
3310 if (SADB_CHECKLEN(mhp, SADB_EXT_SA)) {
3311 error = EINVAL;
3312 goto fail;
3313 }
3314 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
3315 sav->alg_auth = sa0->sadb_sa_auth;
3316 sav->alg_enc = sa0->sadb_sa_encrypt;
3317 sav->flags = sa0->sadb_sa_flags;
3318 if ((sav->flags & SADB_KEY_FLAGS_MAX) != sav->flags) {
3319 ipseclog((LOG_DEBUG,
3320 "%s: invalid sa_flags 0x%08x.\n", __func__,
3321 sav->flags));
3322 error = EINVAL;
3323 goto fail;
3324 }
3325
3326 /* Optional replay window */
3327 replay = 0;
3328 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0)
3329 replay = sa0->sadb_sa_replay;
3330 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_SA_REPLAY)) {
3331 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA_REPLAY)) {
3332 error = EINVAL;
3333 goto fail;
3334 }
3335 replay = ((const struct sadb_x_sa_replay *)
3336 mhp->ext[SADB_X_EXT_SA_REPLAY])->sadb_x_sa_replay_replay;
3337
3338 if (replay > UINT32_MAX - 32) {
3339 ipseclog((LOG_DEBUG,
3340 "%s: replay window too big.\n", __func__));
3341 error = EINVAL;
3342 goto fail;
3343 }
3344
3345 replay = (replay + 7) >> 3;
3346 }
3347
3348 sav->replay = malloc(sizeof(struct secreplay), M_IPSEC_MISC,
3349 M_NOWAIT | M_ZERO);
3350 if (sav->replay == NULL) {
3351 PFKEYSTAT_INC(in_nomem);
3352 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3353 __func__));
3354 error = ENOBUFS;
3355 goto fail;
3356 }
3357
3358 if (replay != 0) {
3359 /* number of 32b blocks to be allocated */
3360 uint32_t bitmap_size;
3361
3362 /* RFC 6479:
3363 * - the allocated replay window size must be
3364 * a power of two.
3365 * - use an extra 32b block as a redundant window.
3366 */
3367 bitmap_size = 1;
3368 while (replay + 4 > bitmap_size)
3369 bitmap_size <<= 1;
3370 bitmap_size = bitmap_size / 4;
3371
3372 sav->replay->bitmap = malloc(
3373 bitmap_size * sizeof(uint32_t), M_IPSEC_MISC,
3374 M_NOWAIT | M_ZERO);
3375 if (sav->replay->bitmap == NULL) {
3376 PFKEYSTAT_INC(in_nomem);
3377 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3378 __func__));
3379 error = ENOBUFS;
3380 goto fail;
3381 }
3382 sav->replay->bitmap_size = bitmap_size;
3383 sav->replay->wsize = replay;
3384 }
3385 }
3386
3387 /* Authentication keys */
3388 if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH)) {
3389 if (SADB_CHECKLEN(mhp, SADB_EXT_KEY_AUTH)) {
3390 error = EINVAL;
3391 goto fail;
3392 }
3393 error = 0;
3394 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH];
3395 len = mhp->extlen[SADB_EXT_KEY_AUTH];
3396 switch (mhp->msg->sadb_msg_satype) {
3397 case SADB_SATYPE_AH:
3398 case SADB_SATYPE_ESP:
3399 case SADB_X_SATYPE_TCPSIGNATURE:
3400 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
3401 sav->alg_auth != SADB_X_AALG_NULL)
3402 error = EINVAL;
3403 break;
3404 case SADB_X_SATYPE_IPCOMP:
3405 default:
3406 error = EINVAL;
3407 break;
3408 }
3409 if (error) {
3410 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n",
3411 __func__));
3412 goto fail;
3413 }
3414
3415 sav->key_auth = key_dup_keymsg(key0, len, M_IPSEC_MISC);
3416 if (sav->key_auth == NULL ) {
3417 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3418 __func__));
3419 PFKEYSTAT_INC(in_nomem);
3420 error = ENOBUFS;
3421 goto fail;
3422 }
3423 }
3424
3425 /* Encryption key */
3426 if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT)) {
3427 if (SADB_CHECKLEN(mhp, SADB_EXT_KEY_ENCRYPT)) {
3428 error = EINVAL;
3429 goto fail;
3430 }
3431 error = 0;
3432 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT];
3433 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT];
3434 switch (mhp->msg->sadb_msg_satype) {
3435 case SADB_SATYPE_ESP:
3436 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
3437 sav->alg_enc != SADB_EALG_NULL) {
3438 error = EINVAL;
3439 break;
3440 }
3441 sav->key_enc = key_dup_keymsg(key0, len, M_IPSEC_MISC);
3442 if (sav->key_enc == NULL) {
3443 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3444 __func__));
3445 PFKEYSTAT_INC(in_nomem);
3446 error = ENOBUFS;
3447 goto fail;
3448 }
3449 break;
3450 case SADB_X_SATYPE_IPCOMP:
3451 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key)))
3452 error = EINVAL;
3453 sav->key_enc = NULL; /*just in case*/
3454 break;
3455 case SADB_SATYPE_AH:
3456 case SADB_X_SATYPE_TCPSIGNATURE:
3457 default:
3458 error = EINVAL;
3459 break;
3460 }
3461 if (error) {
3462 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n",
3463 __func__));
3464 goto fail;
3465 }
3466 }
3467
3468 /* set iv */
3469 sav->ivlen = 0;
3470 switch (mhp->msg->sadb_msg_satype) {
3471 case SADB_SATYPE_AH:
3472 if (sav->flags & SADB_X_EXT_DERIV) {
3473 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
3474 "given to AH SA.\n", __func__));
3475 error = EINVAL;
3476 goto fail;
3477 }
3478 if (sav->alg_enc != SADB_EALG_NONE) {
3479 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3480 "mismated.\n", __func__));
3481 error = EINVAL;
3482 goto fail;
3483 }
3484 error = xform_init(sav, XF_AH);
3485 break;
3486 case SADB_SATYPE_ESP:
3487 if ((sav->flags & (SADB_X_EXT_OLD | SADB_X_EXT_DERIV)) ==
3488 (SADB_X_EXT_OLD | SADB_X_EXT_DERIV)) {
3489 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
3490 "given to old-esp.\n", __func__));
3491 error = EINVAL;
3492 goto fail;
3493 }
3494 error = xform_init(sav, XF_ESP);
3495 break;
3496 case SADB_X_SATYPE_IPCOMP:
3497 if (sav->alg_auth != SADB_AALG_NONE) {
3498 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3499 "mismated.\n", __func__));
3500 error = EINVAL;
3501 goto fail;
3502 }
3503 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 &&
3504 ntohl(sav->spi) >= 0x10000) {
3505 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n",
3506 __func__));
3507 error = EINVAL;
3508 goto fail;
3509 }
3510 error = xform_init(sav, XF_IPCOMP);
3511 break;
3512 case SADB_X_SATYPE_TCPSIGNATURE:
3513 if (sav->alg_enc != SADB_EALG_NONE) {
3514 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3515 "mismated.\n", __func__));
3516 error = EINVAL;
3517 goto fail;
3518 }
3519 error = xform_init(sav, XF_TCPSIGNATURE);
3520 break;
3521 default:
3522 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__));
3523 error = EPROTONOSUPPORT;
3524 goto fail;
3525 }
3526 if (error) {
3527 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n",
3528 __func__, mhp->msg->sadb_msg_satype));
3529 goto fail;
3530 }
3531
3532 /* Handle NAT-T headers */
3533 error = key_setnatt(sav, mhp);
3534 if (error != 0)
3535 goto fail;
3536
3537 /* Initialize lifetime for CURRENT */
3538 sav->firstused = 0;
3539 sav->created = time_second;
3540
3541 /* lifetimes for HARD and SOFT */
3542 error = key_updatelifetimes(sav, mhp);
3543 if (error == 0)
3544 return (0);
3545 fail:
3546 key_cleansav(sav);
3547 return (error);
3548 }
3549
3550 /*
3551 * subroutine for SADB_GET and SADB_DUMP.
3552 */
3553 static struct mbuf *
key_setdumpsa(struct secasvar * sav,uint8_t type,uint8_t satype,uint32_t seq,uint32_t pid)3554 key_setdumpsa(struct secasvar *sav, uint8_t type, uint8_t satype,
3555 uint32_t seq, uint32_t pid)
3556 {
3557 struct seclifetime lft_c;
3558 struct mbuf *result = NULL, *tres = NULL, *m;
3559 int i, dumporder[] = {
3560 SADB_EXT_SA, SADB_X_EXT_SA2, SADB_X_EXT_SA_REPLAY,
3561 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
3562 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC,
3563 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY,
3564 SADB_EXT_KEY_AUTH, SADB_EXT_KEY_ENCRYPT,
3565 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST,
3566 SADB_EXT_SENSITIVITY,
3567 SADB_X_EXT_NAT_T_TYPE,
3568 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT,
3569 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR,
3570 SADB_X_EXT_NAT_T_FRAG,
3571 };
3572 uint32_t replay_count;
3573
3574 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt);
3575 if (m == NULL)
3576 goto fail;
3577 result = m;
3578
3579 for (i = nitems(dumporder) - 1; i >= 0; i--) {
3580 m = NULL;
3581 switch (dumporder[i]) {
3582 case SADB_EXT_SA:
3583 m = key_setsadbsa(sav);
3584 if (!m)
3585 goto fail;
3586 break;
3587
3588 case SADB_X_EXT_SA2:
3589 SECASVAR_LOCK(sav);
3590 replay_count = sav->replay ? sav->replay->count : 0;
3591 SECASVAR_UNLOCK(sav);
3592 m = key_setsadbxsa2(sav->sah->saidx.mode, replay_count,
3593 sav->sah->saidx.reqid);
3594 if (!m)
3595 goto fail;
3596 break;
3597
3598 case SADB_X_EXT_SA_REPLAY:
3599 if (sav->replay == NULL ||
3600 sav->replay->wsize <= UINT8_MAX)
3601 continue;
3602
3603 m = key_setsadbxsareplay(sav->replay->wsize);
3604 if (!m)
3605 goto fail;
3606 break;
3607
3608 case SADB_EXT_ADDRESS_SRC:
3609 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
3610 &sav->sah->saidx.src.sa,
3611 FULLMASK, IPSEC_ULPROTO_ANY);
3612 if (!m)
3613 goto fail;
3614 break;
3615
3616 case SADB_EXT_ADDRESS_DST:
3617 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
3618 &sav->sah->saidx.dst.sa,
3619 FULLMASK, IPSEC_ULPROTO_ANY);
3620 if (!m)
3621 goto fail;
3622 break;
3623
3624 case SADB_EXT_KEY_AUTH:
3625 if (!sav->key_auth)
3626 continue;
3627 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH);
3628 if (!m)
3629 goto fail;
3630 break;
3631
3632 case SADB_EXT_KEY_ENCRYPT:
3633 if (!sav->key_enc)
3634 continue;
3635 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT);
3636 if (!m)
3637 goto fail;
3638 break;
3639
3640 case SADB_EXT_LIFETIME_CURRENT:
3641 lft_c.addtime = sav->created;
3642 lft_c.allocations = (uint32_t)counter_u64_fetch(
3643 sav->lft_c_allocations);
3644 lft_c.bytes = counter_u64_fetch(sav->lft_c_bytes);
3645 lft_c.usetime = sav->firstused;
3646 m = key_setlifetime(&lft_c, SADB_EXT_LIFETIME_CURRENT);
3647 if (!m)
3648 goto fail;
3649 break;
3650
3651 case SADB_EXT_LIFETIME_HARD:
3652 if (!sav->lft_h)
3653 continue;
3654 m = key_setlifetime(sav->lft_h,
3655 SADB_EXT_LIFETIME_HARD);
3656 if (!m)
3657 goto fail;
3658 break;
3659
3660 case SADB_EXT_LIFETIME_SOFT:
3661 if (!sav->lft_s)
3662 continue;
3663 m = key_setlifetime(sav->lft_s,
3664 SADB_EXT_LIFETIME_SOFT);
3665
3666 if (!m)
3667 goto fail;
3668 break;
3669
3670 case SADB_X_EXT_NAT_T_TYPE:
3671 if (sav->natt == NULL)
3672 continue;
3673 m = key_setsadbxtype(UDP_ENCAP_ESPINUDP);
3674 if (!m)
3675 goto fail;
3676 break;
3677
3678 case SADB_X_EXT_NAT_T_DPORT:
3679 if (sav->natt == NULL)
3680 continue;
3681 m = key_setsadbxport(sav->natt->dport,
3682 SADB_X_EXT_NAT_T_DPORT);
3683 if (!m)
3684 goto fail;
3685 break;
3686
3687 case SADB_X_EXT_NAT_T_SPORT:
3688 if (sav->natt == NULL)
3689 continue;
3690 m = key_setsadbxport(sav->natt->sport,
3691 SADB_X_EXT_NAT_T_SPORT);
3692 if (!m)
3693 goto fail;
3694 break;
3695
3696 case SADB_X_EXT_NAT_T_OAI:
3697 if (sav->natt == NULL ||
3698 (sav->natt->flags & IPSEC_NATT_F_OAI) == 0)
3699 continue;
3700 m = key_setsadbaddr(SADB_X_EXT_NAT_T_OAI,
3701 &sav->natt->oai.sa, FULLMASK, IPSEC_ULPROTO_ANY);
3702 if (!m)
3703 goto fail;
3704 break;
3705 case SADB_X_EXT_NAT_T_OAR:
3706 if (sav->natt == NULL ||
3707 (sav->natt->flags & IPSEC_NATT_F_OAR) == 0)
3708 continue;
3709 m = key_setsadbaddr(SADB_X_EXT_NAT_T_OAR,
3710 &sav->natt->oar.sa, FULLMASK, IPSEC_ULPROTO_ANY);
3711 if (!m)
3712 goto fail;
3713 break;
3714 case SADB_X_EXT_NAT_T_FRAG:
3715 /* We do not (yet) support those. */
3716 continue;
3717
3718 case SADB_EXT_ADDRESS_PROXY:
3719 case SADB_EXT_IDENTITY_SRC:
3720 case SADB_EXT_IDENTITY_DST:
3721 /* XXX: should we brought from SPD ? */
3722 case SADB_EXT_SENSITIVITY:
3723 default:
3724 continue;
3725 }
3726
3727 if (!m)
3728 goto fail;
3729 if (tres)
3730 m_cat(m, tres);
3731 tres = m;
3732 }
3733
3734 m_cat(result, tres);
3735 tres = NULL;
3736 if (result->m_len < sizeof(struct sadb_msg)) {
3737 result = m_pullup(result, sizeof(struct sadb_msg));
3738 if (result == NULL)
3739 goto fail;
3740 }
3741
3742 result->m_pkthdr.len = 0;
3743 for (m = result; m; m = m->m_next)
3744 result->m_pkthdr.len += m->m_len;
3745
3746 mtod(result, struct sadb_msg *)->sadb_msg_len =
3747 PFKEY_UNIT64(result->m_pkthdr.len);
3748
3749 return result;
3750
3751 fail:
3752 m_freem(result);
3753 m_freem(tres);
3754 return NULL;
3755 }
3756
3757 /*
3758 * set data into sadb_msg.
3759 */
3760 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)3761 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq,
3762 pid_t pid, u_int16_t reserved)
3763 {
3764 struct mbuf *m;
3765 struct sadb_msg *p;
3766 int len;
3767
3768 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
3769 if (len > MCLBYTES)
3770 return NULL;
3771 MGETHDR(m, M_NOWAIT, MT_DATA);
3772 if (m && len > MHLEN) {
3773 if (!(MCLGET(m, M_NOWAIT))) {
3774 m_freem(m);
3775 m = NULL;
3776 }
3777 }
3778 if (!m)
3779 return NULL;
3780 m->m_pkthdr.len = m->m_len = len;
3781 m->m_next = NULL;
3782
3783 p = mtod(m, struct sadb_msg *);
3784
3785 bzero(p, len);
3786 p->sadb_msg_version = PF_KEY_V2;
3787 p->sadb_msg_type = type;
3788 p->sadb_msg_errno = 0;
3789 p->sadb_msg_satype = satype;
3790 p->sadb_msg_len = PFKEY_UNIT64(tlen);
3791 p->sadb_msg_reserved = reserved;
3792 p->sadb_msg_seq = seq;
3793 p->sadb_msg_pid = (u_int32_t)pid;
3794
3795 return m;
3796 }
3797
3798 /*
3799 * copy secasvar data into sadb_address.
3800 */
3801 static struct mbuf *
key_setsadbsa(struct secasvar * sav)3802 key_setsadbsa(struct secasvar *sav)
3803 {
3804 struct mbuf *m;
3805 struct sadb_sa *p;
3806 int len;
3807
3808 len = PFKEY_ALIGN8(sizeof(struct sadb_sa));
3809 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3810 if (m == NULL)
3811 return (NULL);
3812 m_align(m, len);
3813 m->m_len = len;
3814 p = mtod(m, struct sadb_sa *);
3815 bzero(p, len);
3816 p->sadb_sa_len = PFKEY_UNIT64(len);
3817 p->sadb_sa_exttype = SADB_EXT_SA;
3818 p->sadb_sa_spi = sav->spi;
3819 p->sadb_sa_replay = sav->replay ?
3820 (sav->replay->wsize > UINT8_MAX ? UINT8_MAX :
3821 sav->replay->wsize): 0;
3822 p->sadb_sa_state = sav->state;
3823 p->sadb_sa_auth = sav->alg_auth;
3824 p->sadb_sa_encrypt = sav->alg_enc;
3825 p->sadb_sa_flags = sav->flags & SADB_KEY_FLAGS_MAX;
3826 return (m);
3827 }
3828
3829 /*
3830 * set data into sadb_address.
3831 */
3832 static struct mbuf *
key_setsadbaddr(u_int16_t exttype,const struct sockaddr * saddr,u_int8_t prefixlen,u_int16_t ul_proto)3833 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr,
3834 u_int8_t prefixlen, u_int16_t ul_proto)
3835 {
3836 struct mbuf *m;
3837 struct sadb_address *p;
3838 size_t len;
3839
3840 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) +
3841 PFKEY_ALIGN8(saddr->sa_len);
3842 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3843 if (m == NULL)
3844 return (NULL);
3845 m_align(m, len);
3846 m->m_len = len;
3847 p = mtod(m, struct sadb_address *);
3848
3849 bzero(p, len);
3850 p->sadb_address_len = PFKEY_UNIT64(len);
3851 p->sadb_address_exttype = exttype;
3852 p->sadb_address_proto = ul_proto;
3853 if (prefixlen == FULLMASK) {
3854 switch (saddr->sa_family) {
3855 case AF_INET:
3856 prefixlen = sizeof(struct in_addr) << 3;
3857 break;
3858 case AF_INET6:
3859 prefixlen = sizeof(struct in6_addr) << 3;
3860 break;
3861 default:
3862 ; /*XXX*/
3863 }
3864 }
3865 p->sadb_address_prefixlen = prefixlen;
3866 p->sadb_address_reserved = 0;
3867
3868 bcopy(saddr,
3869 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)),
3870 saddr->sa_len);
3871
3872 return m;
3873 }
3874
3875 /*
3876 * set data into sadb_x_sa2.
3877 */
3878 static struct mbuf *
key_setsadbxsa2(u_int8_t mode,u_int32_t seq,u_int32_t reqid)3879 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid)
3880 {
3881 struct mbuf *m;
3882 struct sadb_x_sa2 *p;
3883 size_t len;
3884
3885 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2));
3886 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3887 if (m == NULL)
3888 return (NULL);
3889 m_align(m, len);
3890 m->m_len = len;
3891 p = mtod(m, struct sadb_x_sa2 *);
3892
3893 bzero(p, len);
3894 p->sadb_x_sa2_len = PFKEY_UNIT64(len);
3895 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
3896 p->sadb_x_sa2_mode = mode;
3897 p->sadb_x_sa2_reserved1 = 0;
3898 p->sadb_x_sa2_reserved2 = 0;
3899 p->sadb_x_sa2_sequence = seq;
3900 p->sadb_x_sa2_reqid = reqid;
3901
3902 return m;
3903 }
3904
3905 /*
3906 * Set data into sadb_x_sa_replay.
3907 */
3908 static struct mbuf *
key_setsadbxsareplay(u_int32_t replay)3909 key_setsadbxsareplay(u_int32_t replay)
3910 {
3911 struct mbuf *m;
3912 struct sadb_x_sa_replay *p;
3913 size_t len;
3914
3915 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa_replay));
3916 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3917 if (m == NULL)
3918 return (NULL);
3919 m_align(m, len);
3920 m->m_len = len;
3921 p = mtod(m, struct sadb_x_sa_replay *);
3922
3923 bzero(p, len);
3924 p->sadb_x_sa_replay_len = PFKEY_UNIT64(len);
3925 p->sadb_x_sa_replay_exttype = SADB_X_EXT_SA_REPLAY;
3926 p->sadb_x_sa_replay_replay = (replay << 3);
3927
3928 return m;
3929 }
3930
3931 /*
3932 * Set a type in sadb_x_nat_t_type.
3933 */
3934 static struct mbuf *
key_setsadbxtype(u_int16_t type)3935 key_setsadbxtype(u_int16_t type)
3936 {
3937 struct mbuf *m;
3938 size_t len;
3939 struct sadb_x_nat_t_type *p;
3940
3941 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type));
3942
3943 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3944 if (m == NULL)
3945 return (NULL);
3946 m_align(m, len);
3947 m->m_len = len;
3948 p = mtod(m, struct sadb_x_nat_t_type *);
3949
3950 bzero(p, len);
3951 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len);
3952 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
3953 p->sadb_x_nat_t_type_type = type;
3954
3955 return (m);
3956 }
3957 /*
3958 * Set a port in sadb_x_nat_t_port.
3959 * In contrast to default RFC 2367 behaviour, port is in network byte order.
3960 */
3961 static struct mbuf *
key_setsadbxport(u_int16_t port,u_int16_t type)3962 key_setsadbxport(u_int16_t port, u_int16_t type)
3963 {
3964 struct mbuf *m;
3965 size_t len;
3966 struct sadb_x_nat_t_port *p;
3967
3968 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port));
3969
3970 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
3971 if (m == NULL)
3972 return (NULL);
3973 m_align(m, len);
3974 m->m_len = len;
3975 p = mtod(m, struct sadb_x_nat_t_port *);
3976
3977 bzero(p, len);
3978 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len);
3979 p->sadb_x_nat_t_port_exttype = type;
3980 p->sadb_x_nat_t_port_port = port;
3981
3982 return (m);
3983 }
3984
3985 /*
3986 * Get port from sockaddr. Port is in network byte order.
3987 */
3988 uint16_t
key_portfromsaddr(struct sockaddr * sa)3989 key_portfromsaddr(struct sockaddr *sa)
3990 {
3991
3992 switch (sa->sa_family) {
3993 #ifdef INET
3994 case AF_INET:
3995 return ((struct sockaddr_in *)sa)->sin_port;
3996 #endif
3997 #ifdef INET6
3998 case AF_INET6:
3999 return ((struct sockaddr_in6 *)sa)->sin6_port;
4000 #endif
4001 }
4002 return (0);
4003 }
4004
4005 /*
4006 * Set port in struct sockaddr. Port is in network byte order.
4007 */
4008 void
key_porttosaddr(struct sockaddr * sa,uint16_t port)4009 key_porttosaddr(struct sockaddr *sa, uint16_t port)
4010 {
4011
4012 switch (sa->sa_family) {
4013 #ifdef INET
4014 case AF_INET:
4015 ((struct sockaddr_in *)sa)->sin_port = port;
4016 break;
4017 #endif
4018 #ifdef INET6
4019 case AF_INET6:
4020 ((struct sockaddr_in6 *)sa)->sin6_port = port;
4021 break;
4022 #endif
4023 default:
4024 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n",
4025 __func__, sa->sa_family));
4026 break;
4027 }
4028 }
4029
4030 /*
4031 * set data into sadb_x_policy
4032 */
4033 static struct mbuf *
key_setsadbxpolicy(u_int16_t type,u_int8_t dir,u_int32_t id,u_int32_t priority)4034 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id, u_int32_t priority)
4035 {
4036 struct mbuf *m;
4037 struct sadb_x_policy *p;
4038 size_t len;
4039
4040 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy));
4041 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
4042 if (m == NULL)
4043 return (NULL);
4044 m_align(m, len);
4045 m->m_len = len;
4046 p = mtod(m, struct sadb_x_policy *);
4047
4048 bzero(p, len);
4049 p->sadb_x_policy_len = PFKEY_UNIT64(len);
4050 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
4051 p->sadb_x_policy_type = type;
4052 p->sadb_x_policy_dir = dir;
4053 p->sadb_x_policy_id = id;
4054 p->sadb_x_policy_priority = priority;
4055
4056 return m;
4057 }
4058
4059 /* %%% utilities */
4060 /* Take a key message (sadb_key) from the socket and turn it into one
4061 * of the kernel's key structures (seckey).
4062 *
4063 * IN: pointer to the src
4064 * OUT: NULL no more memory
4065 */
4066 struct seckey *
key_dup_keymsg(const struct sadb_key * src,size_t len,struct malloc_type * type)4067 key_dup_keymsg(const struct sadb_key *src, size_t len,
4068 struct malloc_type *type)
4069 {
4070 struct seckey *dst;
4071
4072 dst = malloc(sizeof(*dst), type, M_NOWAIT);
4073 if (dst != NULL) {
4074 dst->bits = src->sadb_key_bits;
4075 dst->key_data = malloc(len, type, M_NOWAIT);
4076 if (dst->key_data != NULL) {
4077 bcopy((const char *)(src + 1), dst->key_data, len);
4078 } else {
4079 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
4080 __func__));
4081 free(dst, type);
4082 dst = NULL;
4083 }
4084 } else {
4085 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
4086 __func__));
4087
4088 }
4089 return (dst);
4090 }
4091
4092 /* Take a lifetime message (sadb_lifetime) passed in on a socket and
4093 * turn it into one of the kernel's lifetime structures (seclifetime).
4094 *
4095 * IN: pointer to the destination, source and malloc type
4096 * OUT: NULL, no more memory
4097 */
4098
4099 static struct seclifetime *
key_dup_lifemsg(const struct sadb_lifetime * src,struct malloc_type * type)4100 key_dup_lifemsg(const struct sadb_lifetime *src, struct malloc_type *type)
4101 {
4102 struct seclifetime *dst;
4103
4104 dst = malloc(sizeof(*dst), type, M_NOWAIT);
4105 if (dst == NULL) {
4106 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
4107 return (NULL);
4108 }
4109 dst->allocations = src->sadb_lifetime_allocations;
4110 dst->bytes = src->sadb_lifetime_bytes;
4111 dst->addtime = src->sadb_lifetime_addtime;
4112 dst->usetime = src->sadb_lifetime_usetime;
4113 return (dst);
4114 }
4115
4116 /*
4117 * compare two secasindex structure.
4118 * flag can specify to compare 2 saidxes.
4119 * compare two secasindex structure without both mode and reqid.
4120 * don't compare port.
4121 * IN:
4122 * saidx0: source, it can be in SAD.
4123 * saidx1: object.
4124 * OUT:
4125 * 1 : equal
4126 * 0 : not equal
4127 */
4128 static int
key_cmpsaidx(const struct secasindex * saidx0,const struct secasindex * saidx1,int flag)4129 key_cmpsaidx(const struct secasindex *saidx0, const struct secasindex *saidx1,
4130 int flag)
4131 {
4132
4133 /* sanity */
4134 if (saidx0 == NULL && saidx1 == NULL)
4135 return 1;
4136
4137 if (saidx0 == NULL || saidx1 == NULL)
4138 return 0;
4139
4140 if (saidx0->proto != saidx1->proto)
4141 return 0;
4142
4143 if (flag == CMP_EXACTLY) {
4144 if (saidx0->mode != saidx1->mode)
4145 return 0;
4146 if (saidx0->reqid != saidx1->reqid)
4147 return 0;
4148 if (bcmp(&saidx0->src, &saidx1->src,
4149 saidx0->src.sa.sa_len) != 0 ||
4150 bcmp(&saidx0->dst, &saidx1->dst,
4151 saidx0->dst.sa.sa_len) != 0)
4152 return 0;
4153 } else {
4154
4155 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */
4156 if (flag == CMP_MODE_REQID || flag == CMP_REQID) {
4157 /*
4158 * If reqid of SPD is non-zero, unique SA is required.
4159 * The result must be of same reqid in this case.
4160 */
4161 if (saidx1->reqid != 0 &&
4162 saidx0->reqid != saidx1->reqid)
4163 return 0;
4164 }
4165
4166 if (flag == CMP_MODE_REQID) {
4167 if (saidx0->mode != IPSEC_MODE_ANY
4168 && saidx0->mode != saidx1->mode)
4169 return 0;
4170 }
4171
4172 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0)
4173 return 0;
4174 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0)
4175 return 0;
4176 }
4177
4178 return 1;
4179 }
4180
4181 /*
4182 * compare two secindex structure exactly.
4183 * IN:
4184 * spidx0: source, it is often in SPD.
4185 * spidx1: object, it is often from PFKEY message.
4186 * OUT:
4187 * 1 : equal
4188 * 0 : not equal
4189 */
4190 static int
key_cmpspidx_exactly(struct secpolicyindex * spidx0,struct secpolicyindex * spidx1)4191 key_cmpspidx_exactly(struct secpolicyindex *spidx0,
4192 struct secpolicyindex *spidx1)
4193 {
4194 /* sanity */
4195 if (spidx0 == NULL && spidx1 == NULL)
4196 return 1;
4197
4198 if (spidx0 == NULL || spidx1 == NULL)
4199 return 0;
4200
4201 if (spidx0->prefs != spidx1->prefs
4202 || spidx0->prefd != spidx1->prefd
4203 || spidx0->ul_proto != spidx1->ul_proto
4204 || spidx0->dir != spidx1->dir)
4205 return 0;
4206
4207 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 &&
4208 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0;
4209 }
4210
4211 /*
4212 * compare two secindex structure with mask.
4213 * IN:
4214 * spidx0: source, it is often in SPD.
4215 * spidx1: object, it is often from IP header.
4216 * OUT:
4217 * 1 : equal
4218 * 0 : not equal
4219 */
4220 static int
key_cmpspidx_withmask(struct secpolicyindex * spidx0,struct secpolicyindex * spidx1)4221 key_cmpspidx_withmask(struct secpolicyindex *spidx0,
4222 struct secpolicyindex *spidx1)
4223 {
4224 /* sanity */
4225 if (spidx0 == NULL && spidx1 == NULL)
4226 return 1;
4227
4228 if (spidx0 == NULL || spidx1 == NULL)
4229 return 0;
4230
4231 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family ||
4232 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family ||
4233 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len ||
4234 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len)
4235 return 0;
4236
4237 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */
4238 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY
4239 && spidx0->ul_proto != spidx1->ul_proto)
4240 return 0;
4241
4242 switch (spidx0->src.sa.sa_family) {
4243 case AF_INET:
4244 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY
4245 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port)
4246 return 0;
4247 if (!key_bbcmp(&spidx0->src.sin.sin_addr,
4248 &spidx1->src.sin.sin_addr, spidx0->prefs))
4249 return 0;
4250 break;
4251 case AF_INET6:
4252 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY
4253 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port)
4254 return 0;
4255 /*
4256 * scope_id check. if sin6_scope_id is 0, we regard it
4257 * as a wildcard scope, which matches any scope zone ID.
4258 */
4259 if (spidx0->src.sin6.sin6_scope_id &&
4260 spidx1->src.sin6.sin6_scope_id &&
4261 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id)
4262 return 0;
4263 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr,
4264 &spidx1->src.sin6.sin6_addr, spidx0->prefs))
4265 return 0;
4266 break;
4267 default:
4268 /* XXX */
4269 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0)
4270 return 0;
4271 break;
4272 }
4273
4274 switch (spidx0->dst.sa.sa_family) {
4275 case AF_INET:
4276 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY
4277 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port)
4278 return 0;
4279 if (!key_bbcmp(&spidx0->dst.sin.sin_addr,
4280 &spidx1->dst.sin.sin_addr, spidx0->prefd))
4281 return 0;
4282 break;
4283 case AF_INET6:
4284 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY
4285 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port)
4286 return 0;
4287 /*
4288 * scope_id check. if sin6_scope_id is 0, we regard it
4289 * as a wildcard scope, which matches any scope zone ID.
4290 */
4291 if (spidx0->dst.sin6.sin6_scope_id &&
4292 spidx1->dst.sin6.sin6_scope_id &&
4293 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id)
4294 return 0;
4295 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr,
4296 &spidx1->dst.sin6.sin6_addr, spidx0->prefd))
4297 return 0;
4298 break;
4299 default:
4300 /* XXX */
4301 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0)
4302 return 0;
4303 break;
4304 }
4305
4306 /* XXX Do we check other field ? e.g. flowinfo */
4307
4308 return 1;
4309 }
4310
4311 #ifdef satosin
4312 #undef satosin
4313 #endif
4314 #define satosin(s) ((const struct sockaddr_in *)s)
4315 #ifdef satosin6
4316 #undef satosin6
4317 #endif
4318 #define satosin6(s) ((const struct sockaddr_in6 *)s)
4319 /* returns 0 on match */
4320 int
key_sockaddrcmp(const struct sockaddr * sa1,const struct sockaddr * sa2,int port)4321 key_sockaddrcmp(const struct sockaddr *sa1, const struct sockaddr *sa2,
4322 int port)
4323 {
4324 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
4325 return 1;
4326
4327 switch (sa1->sa_family) {
4328 #ifdef INET
4329 case AF_INET:
4330 if (sa1->sa_len != sizeof(struct sockaddr_in))
4331 return 1;
4332 if (satosin(sa1)->sin_addr.s_addr !=
4333 satosin(sa2)->sin_addr.s_addr) {
4334 return 1;
4335 }
4336 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port)
4337 return 1;
4338 break;
4339 #endif
4340 #ifdef INET6
4341 case AF_INET6:
4342 if (sa1->sa_len != sizeof(struct sockaddr_in6))
4343 return 1; /*EINVAL*/
4344 if (satosin6(sa1)->sin6_scope_id !=
4345 satosin6(sa2)->sin6_scope_id) {
4346 return 1;
4347 }
4348 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr,
4349 &satosin6(sa2)->sin6_addr)) {
4350 return 1;
4351 }
4352 if (port &&
4353 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) {
4354 return 1;
4355 }
4356 break;
4357 #endif
4358 default:
4359 if (bcmp(sa1, sa2, sa1->sa_len) != 0)
4360 return 1;
4361 break;
4362 }
4363
4364 return 0;
4365 }
4366
4367 /* returns 0 on match */
4368 int
key_sockaddrcmp_withmask(const struct sockaddr * sa1,const struct sockaddr * sa2,size_t mask)4369 key_sockaddrcmp_withmask(const struct sockaddr *sa1,
4370 const struct sockaddr *sa2, size_t mask)
4371 {
4372 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
4373 return (1);
4374
4375 switch (sa1->sa_family) {
4376 #ifdef INET
4377 case AF_INET:
4378 return (!key_bbcmp(&satosin(sa1)->sin_addr,
4379 &satosin(sa2)->sin_addr, mask));
4380 #endif
4381 #ifdef INET6
4382 case AF_INET6:
4383 if (satosin6(sa1)->sin6_scope_id !=
4384 satosin6(sa2)->sin6_scope_id)
4385 return (1);
4386 return (!key_bbcmp(&satosin6(sa1)->sin6_addr,
4387 &satosin6(sa2)->sin6_addr, mask));
4388 #endif
4389 }
4390 return (1);
4391 }
4392 #undef satosin
4393 #undef satosin6
4394
4395 /*
4396 * compare two buffers with mask.
4397 * IN:
4398 * addr1: source
4399 * addr2: object
4400 * bits: Number of bits to compare
4401 * OUT:
4402 * 1 : equal
4403 * 0 : not equal
4404 */
4405 static int
key_bbcmp(const void * a1,const void * a2,u_int bits)4406 key_bbcmp(const void *a1, const void *a2, u_int bits)
4407 {
4408 const unsigned char *p1 = a1;
4409 const unsigned char *p2 = a2;
4410
4411 /* XXX: This could be considerably faster if we compare a word
4412 * at a time, but it is complicated on LSB Endian machines */
4413
4414 /* Handle null pointers */
4415 if (p1 == NULL || p2 == NULL)
4416 return (p1 == p2);
4417
4418 while (bits >= 8) {
4419 if (*p1++ != *p2++)
4420 return 0;
4421 bits -= 8;
4422 }
4423
4424 if (bits > 0) {
4425 u_int8_t mask = ~((1<<(8-bits))-1);
4426 if ((*p1 & mask) != (*p2 & mask))
4427 return 0;
4428 }
4429 return 1; /* Match! */
4430 }
4431
4432 static void
key_flush_spd(time_t now)4433 key_flush_spd(time_t now)
4434 {
4435 SPTREE_RLOCK_TRACKER;
4436 struct secpolicy_list drainq;
4437 struct secpolicy *sp, *nextsp;
4438 u_int dir;
4439
4440 LIST_INIT(&drainq);
4441 SPTREE_RLOCK();
4442 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
4443 TAILQ_FOREACH(sp, &V_sptree[dir], chain) {
4444 if (sp->lifetime == 0 && sp->validtime == 0)
4445 continue;
4446 if ((sp->lifetime &&
4447 now - sp->created > sp->lifetime) ||
4448 (sp->validtime &&
4449 now - sp->lastused > sp->validtime)) {
4450 /* Hold extra reference to send SPDEXPIRE */
4451 SP_ADDREF(sp);
4452 LIST_INSERT_HEAD(&drainq, sp, drainq);
4453 }
4454 }
4455 }
4456 SPTREE_RUNLOCK();
4457 if (LIST_EMPTY(&drainq))
4458 return;
4459
4460 SPTREE_WLOCK();
4461 sp = LIST_FIRST(&drainq);
4462 while (sp != NULL) {
4463 nextsp = LIST_NEXT(sp, drainq);
4464 /* Check that SP is still linked */
4465 if (sp->state != IPSEC_SPSTATE_ALIVE) {
4466 LIST_REMOVE(sp, drainq);
4467 key_freesp(&sp); /* release extra reference */
4468 sp = nextsp;
4469 continue;
4470 }
4471 TAILQ_REMOVE(&V_sptree[sp->spidx.dir], sp, chain);
4472 V_spd_size--;
4473 LIST_REMOVE(sp, idhash);
4474 sp->state = IPSEC_SPSTATE_DEAD;
4475 sp = nextsp;
4476 }
4477 V_sp_genid++;
4478 SPTREE_WUNLOCK();
4479 if (SPDCACHE_ENABLED())
4480 spdcache_clear();
4481
4482 sp = LIST_FIRST(&drainq);
4483 while (sp != NULL) {
4484 nextsp = LIST_NEXT(sp, drainq);
4485 key_spdexpire(sp);
4486 key_freesp(&sp); /* release extra reference */
4487 key_freesp(&sp); /* release last reference */
4488 sp = nextsp;
4489 }
4490 }
4491
4492 static void
key_flush_sad(time_t now)4493 key_flush_sad(time_t now)
4494 {
4495 SAHTREE_RLOCK_TRACKER;
4496 struct secashead_list emptyq;
4497 struct secasvar_list drainq, hexpireq, sexpireq, freeq;
4498 struct secashead *sah, *nextsah;
4499 struct secasvar *sav, *nextsav;
4500
4501 LIST_INIT(&drainq);
4502 LIST_INIT(&hexpireq);
4503 LIST_INIT(&sexpireq);
4504 LIST_INIT(&emptyq);
4505
4506 SAHTREE_RLOCK();
4507 TAILQ_FOREACH(sah, &V_sahtree, chain) {
4508 /* Check for empty SAH */
4509 if (TAILQ_EMPTY(&sah->savtree_larval) &&
4510 TAILQ_EMPTY(&sah->savtree_alive)) {
4511 SAH_ADDREF(sah);
4512 LIST_INSERT_HEAD(&emptyq, sah, drainq);
4513 continue;
4514 }
4515 /* Add all stale LARVAL SAs into drainq */
4516 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
4517 if (now - sav->created < V_key_larval_lifetime)
4518 continue;
4519 SAV_ADDREF(sav);
4520 LIST_INSERT_HEAD(&drainq, sav, drainq);
4521 }
4522 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
4523 /* lifetimes aren't specified */
4524 if (sav->lft_h == NULL)
4525 continue;
4526 SECASVAR_LOCK(sav);
4527 /*
4528 * Check again with lock held, because it may
4529 * be updated by SADB_UPDATE.
4530 */
4531 if (sav->lft_h == NULL) {
4532 SECASVAR_UNLOCK(sav);
4533 continue;
4534 }
4535 /*
4536 * RFC 2367:
4537 * HARD lifetimes MUST take precedence over SOFT
4538 * lifetimes, meaning if the HARD and SOFT lifetimes
4539 * are the same, the HARD lifetime will appear on the
4540 * EXPIRE message.
4541 */
4542 /* check HARD lifetime */
4543 if ((sav->lft_h->addtime != 0 &&
4544 now - sav->created > sav->lft_h->addtime) ||
4545 (sav->lft_h->usetime != 0 && sav->firstused &&
4546 now - sav->firstused > sav->lft_h->usetime) ||
4547 (sav->lft_h->bytes != 0 && counter_u64_fetch(
4548 sav->lft_c_bytes) > sav->lft_h->bytes)) {
4549 SECASVAR_UNLOCK(sav);
4550 SAV_ADDREF(sav);
4551 LIST_INSERT_HEAD(&hexpireq, sav, drainq);
4552 continue;
4553 }
4554 /* check SOFT lifetime (only for MATURE SAs) */
4555 if (sav->state == SADB_SASTATE_MATURE && (
4556 (sav->lft_s->addtime != 0 &&
4557 now - sav->created > sav->lft_s->addtime) ||
4558 (sav->lft_s->usetime != 0 && sav->firstused &&
4559 now - sav->firstused > sav->lft_s->usetime) ||
4560 (sav->lft_s->bytes != 0 && counter_u64_fetch(
4561 sav->lft_c_bytes) > sav->lft_s->bytes))) {
4562 SECASVAR_UNLOCK(sav);
4563 SAV_ADDREF(sav);
4564 LIST_INSERT_HEAD(&sexpireq, sav, drainq);
4565 continue;
4566 }
4567 SECASVAR_UNLOCK(sav);
4568 }
4569 }
4570 SAHTREE_RUNLOCK();
4571
4572 if (LIST_EMPTY(&emptyq) && LIST_EMPTY(&drainq) &&
4573 LIST_EMPTY(&hexpireq) && LIST_EMPTY(&sexpireq))
4574 return;
4575
4576 LIST_INIT(&freeq);
4577 SAHTREE_WLOCK();
4578 /* Unlink stale LARVAL SAs */
4579 sav = LIST_FIRST(&drainq);
4580 while (sav != NULL) {
4581 nextsav = LIST_NEXT(sav, drainq);
4582 /* Check that SA is still LARVAL */
4583 if (sav->state != SADB_SASTATE_LARVAL) {
4584 LIST_REMOVE(sav, drainq);
4585 LIST_INSERT_HEAD(&freeq, sav, drainq);
4586 sav = nextsav;
4587 continue;
4588 }
4589 TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
4590 LIST_REMOVE(sav, spihash);
4591 sav->state = SADB_SASTATE_DEAD;
4592 sav = nextsav;
4593 }
4594 /* Unlink all SAs with expired HARD lifetime */
4595 sav = LIST_FIRST(&hexpireq);
4596 while (sav != NULL) {
4597 nextsav = LIST_NEXT(sav, drainq);
4598 /* Check that SA is not unlinked */
4599 if (sav->state == SADB_SASTATE_DEAD) {
4600 LIST_REMOVE(sav, drainq);
4601 LIST_INSERT_HEAD(&freeq, sav, drainq);
4602 sav = nextsav;
4603 continue;
4604 }
4605 TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
4606 LIST_REMOVE(sav, spihash);
4607 sav->state = SADB_SASTATE_DEAD;
4608 sav = nextsav;
4609 }
4610 /* Mark all SAs with expired SOFT lifetime as DYING */
4611 sav = LIST_FIRST(&sexpireq);
4612 while (sav != NULL) {
4613 nextsav = LIST_NEXT(sav, drainq);
4614 /* Check that SA is not unlinked */
4615 if (sav->state == SADB_SASTATE_DEAD) {
4616 LIST_REMOVE(sav, drainq);
4617 LIST_INSERT_HEAD(&freeq, sav, drainq);
4618 sav = nextsav;
4619 continue;
4620 }
4621 /*
4622 * NOTE: this doesn't change SA order in the chain.
4623 */
4624 sav->state = SADB_SASTATE_DYING;
4625 sav = nextsav;
4626 }
4627 /* Unlink empty SAHs */
4628 sah = LIST_FIRST(&emptyq);
4629 while (sah != NULL) {
4630 nextsah = LIST_NEXT(sah, drainq);
4631 /* Check that SAH is still empty and not unlinked */
4632 if (sah->state == SADB_SASTATE_DEAD ||
4633 !TAILQ_EMPTY(&sah->savtree_larval) ||
4634 !TAILQ_EMPTY(&sah->savtree_alive)) {
4635 LIST_REMOVE(sah, drainq);
4636 key_freesah(&sah); /* release extra reference */
4637 sah = nextsah;
4638 continue;
4639 }
4640 TAILQ_REMOVE(&V_sahtree, sah, chain);
4641 LIST_REMOVE(sah, addrhash);
4642 sah->state = SADB_SASTATE_DEAD;
4643 sah = nextsah;
4644 }
4645 SAHTREE_WUNLOCK();
4646
4647 /* Send SPDEXPIRE messages */
4648 sav = LIST_FIRST(&hexpireq);
4649 while (sav != NULL) {
4650 nextsav = LIST_NEXT(sav, drainq);
4651 key_expire(sav, 1);
4652 key_freesah(&sav->sah); /* release reference from SAV */
4653 key_freesav(&sav); /* release extra reference */
4654 key_freesav(&sav); /* release last reference */
4655 sav = nextsav;
4656 }
4657 sav = LIST_FIRST(&sexpireq);
4658 while (sav != NULL) {
4659 nextsav = LIST_NEXT(sav, drainq);
4660 key_expire(sav, 0);
4661 key_freesav(&sav); /* release extra reference */
4662 sav = nextsav;
4663 }
4664 /* Free stale LARVAL SAs */
4665 sav = LIST_FIRST(&drainq);
4666 while (sav != NULL) {
4667 nextsav = LIST_NEXT(sav, drainq);
4668 key_freesah(&sav->sah); /* release reference from SAV */
4669 key_freesav(&sav); /* release extra reference */
4670 key_freesav(&sav); /* release last reference */
4671 sav = nextsav;
4672 }
4673 /* Free SAs that were unlinked/changed by someone else */
4674 sav = LIST_FIRST(&freeq);
4675 while (sav != NULL) {
4676 nextsav = LIST_NEXT(sav, drainq);
4677 key_freesav(&sav); /* release extra reference */
4678 sav = nextsav;
4679 }
4680 /* Free empty SAH */
4681 sah = LIST_FIRST(&emptyq);
4682 while (sah != NULL) {
4683 nextsah = LIST_NEXT(sah, drainq);
4684 key_freesah(&sah); /* release extra reference */
4685 key_freesah(&sah); /* release last reference */
4686 sah = nextsah;
4687 }
4688 }
4689
4690 static void
key_flush_acq(time_t now)4691 key_flush_acq(time_t now)
4692 {
4693 struct secacq *acq, *nextacq;
4694
4695 /* ACQ tree */
4696 ACQ_LOCK();
4697 acq = LIST_FIRST(&V_acqtree);
4698 while (acq != NULL) {
4699 nextacq = LIST_NEXT(acq, chain);
4700 if (now - acq->created > V_key_blockacq_lifetime) {
4701 LIST_REMOVE(acq, chain);
4702 LIST_REMOVE(acq, addrhash);
4703 LIST_REMOVE(acq, seqhash);
4704 free(acq, M_IPSEC_SAQ);
4705 }
4706 acq = nextacq;
4707 }
4708 ACQ_UNLOCK();
4709 }
4710
4711 static void
key_flush_spacq(time_t now)4712 key_flush_spacq(time_t now)
4713 {
4714 struct secspacq *acq, *nextacq;
4715
4716 /* SP ACQ tree */
4717 SPACQ_LOCK();
4718 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) {
4719 nextacq = LIST_NEXT(acq, chain);
4720 if (now - acq->created > V_key_blockacq_lifetime
4721 && __LIST_CHAINED(acq)) {
4722 LIST_REMOVE(acq, chain);
4723 free(acq, M_IPSEC_SAQ);
4724 }
4725 }
4726 SPACQ_UNLOCK();
4727 }
4728
4729 /*
4730 * time handler.
4731 * scanning SPD and SAD to check status for each entries,
4732 * and do to remove or to expire.
4733 * XXX: year 2038 problem may remain.
4734 */
4735 static void
key_timehandler(void * arg)4736 key_timehandler(void *arg)
4737 {
4738 VNET_ITERATOR_DECL(vnet_iter);
4739 time_t now = time_second;
4740
4741 VNET_LIST_RLOCK_NOSLEEP();
4742 VNET_FOREACH(vnet_iter) {
4743 CURVNET_SET(vnet_iter);
4744 key_flush_spd(now);
4745 key_flush_sad(now);
4746 key_flush_acq(now);
4747 key_flush_spacq(now);
4748 CURVNET_RESTORE();
4749 }
4750 VNET_LIST_RUNLOCK_NOSLEEP();
4751
4752 #ifndef IPSEC_DEBUG2
4753 /* do exchange to tick time !! */
4754 callout_schedule(&key_timer, hz);
4755 #endif /* IPSEC_DEBUG2 */
4756 }
4757
4758 u_long
key_random()4759 key_random()
4760 {
4761 u_long value;
4762
4763 arc4random_buf(&value, sizeof(value));
4764 return value;
4765 }
4766
4767 /*
4768 * map SADB_SATYPE_* to IPPROTO_*.
4769 * if satype == SADB_SATYPE then satype is mapped to ~0.
4770 * OUT:
4771 * 0: invalid satype.
4772 */
4773 static uint8_t
key_satype2proto(uint8_t satype)4774 key_satype2proto(uint8_t satype)
4775 {
4776 switch (satype) {
4777 case SADB_SATYPE_UNSPEC:
4778 return IPSEC_PROTO_ANY;
4779 case SADB_SATYPE_AH:
4780 return IPPROTO_AH;
4781 case SADB_SATYPE_ESP:
4782 return IPPROTO_ESP;
4783 case SADB_X_SATYPE_IPCOMP:
4784 return IPPROTO_IPCOMP;
4785 case SADB_X_SATYPE_TCPSIGNATURE:
4786 return IPPROTO_TCP;
4787 default:
4788 return 0;
4789 }
4790 /* NOTREACHED */
4791 }
4792
4793 /*
4794 * map IPPROTO_* to SADB_SATYPE_*
4795 * OUT:
4796 * 0: invalid protocol type.
4797 */
4798 static uint8_t
key_proto2satype(uint8_t proto)4799 key_proto2satype(uint8_t proto)
4800 {
4801 switch (proto) {
4802 case IPPROTO_AH:
4803 return SADB_SATYPE_AH;
4804 case IPPROTO_ESP:
4805 return SADB_SATYPE_ESP;
4806 case IPPROTO_IPCOMP:
4807 return SADB_X_SATYPE_IPCOMP;
4808 case IPPROTO_TCP:
4809 return SADB_X_SATYPE_TCPSIGNATURE;
4810 default:
4811 return 0;
4812 }
4813 /* NOTREACHED */
4814 }
4815
4816 /* %%% PF_KEY */
4817 /*
4818 * SADB_GETSPI processing is to receive
4819 * <base, (SA2), src address, dst address, (SPI range)>
4820 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND
4821 * tree with the status of LARVAL, and send
4822 * <base, SA(*), address(SD)>
4823 * to the IKMPd.
4824 *
4825 * IN: mhp: pointer to the pointer to each header.
4826 * OUT: NULL if fail.
4827 * other if success, return pointer to the message to send.
4828 */
4829 static int
key_getspi(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)4830 key_getspi(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4831 {
4832 struct secasindex saidx;
4833 struct sadb_address *src0, *dst0;
4834 struct secasvar *sav;
4835 uint32_t reqid, spi;
4836 int error;
4837 uint8_t mode, proto;
4838
4839 IPSEC_ASSERT(so != NULL, ("null socket"));
4840 IPSEC_ASSERT(m != NULL, ("null mbuf"));
4841 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
4842 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
4843
4844 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
4845 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST)
4846 #ifdef PFKEY_STRICT_CHECKS
4847 || SADB_CHECKHDR(mhp, SADB_EXT_SPIRANGE)
4848 #endif
4849 ) {
4850 ipseclog((LOG_DEBUG,
4851 "%s: invalid message: missing required header.\n",
4852 __func__));
4853 error = EINVAL;
4854 goto fail;
4855 }
4856 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
4857 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)
4858 #ifdef PFKEY_STRICT_CHECKS
4859 || SADB_CHECKLEN(mhp, SADB_EXT_SPIRANGE)
4860 #endif
4861 ) {
4862 ipseclog((LOG_DEBUG,
4863 "%s: invalid message: wrong header size.\n", __func__));
4864 error = EINVAL;
4865 goto fail;
4866 }
4867 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
4868 mode = IPSEC_MODE_ANY;
4869 reqid = 0;
4870 } else {
4871 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
4872 ipseclog((LOG_DEBUG,
4873 "%s: invalid message: wrong header size.\n",
4874 __func__));
4875 error = EINVAL;
4876 goto fail;
4877 }
4878 mode = ((struct sadb_x_sa2 *)
4879 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4880 reqid = ((struct sadb_x_sa2 *)
4881 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4882 }
4883
4884 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4885 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4886
4887 /* map satype to proto */
4888 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4889 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
4890 __func__));
4891 error = EINVAL;
4892 goto fail;
4893 }
4894 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
4895 (struct sockaddr *)(dst0 + 1));
4896 if (error != 0) {
4897 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
4898 error = EINVAL;
4899 goto fail;
4900 }
4901 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4902
4903 /* SPI allocation */
4904 spi = key_do_getnewspi(
4905 (struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], &saidx);
4906 if (spi == 0) {
4907 /*
4908 * Requested SPI or SPI range is not available or
4909 * already used.
4910 */
4911 error = EEXIST;
4912 goto fail;
4913 }
4914 sav = key_newsav(mhp, &saidx, spi, &error);
4915 if (sav == NULL)
4916 goto fail;
4917
4918 if (sav->seq != 0) {
4919 /*
4920 * RFC2367:
4921 * If the SADB_GETSPI message is in response to a
4922 * kernel-generated SADB_ACQUIRE, the sadb_msg_seq
4923 * MUST be the same as the SADB_ACQUIRE message.
4924 *
4925 * XXXAE: However it doesn't definethe behaviour how to
4926 * check this and what to do if it doesn't match.
4927 * Also what we should do if it matches?
4928 *
4929 * We can compare saidx used in SADB_ACQUIRE with saidx
4930 * used in SADB_GETSPI, but this probably can break
4931 * existing software. For now just warn if it doesn't match.
4932 *
4933 * XXXAE: anyway it looks useless.
4934 */
4935 key_acqdone(&saidx, sav->seq);
4936 }
4937 KEYDBG(KEY_STAMP,
4938 printf("%s: SA(%p)\n", __func__, sav));
4939 KEYDBG(KEY_DATA, kdebug_secasv(sav));
4940
4941 {
4942 struct mbuf *n, *nn;
4943 struct sadb_sa *m_sa;
4944 struct sadb_msg *newmsg;
4945 int off, len;
4946
4947 /* create new sadb_msg to reply. */
4948 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) +
4949 PFKEY_ALIGN8(sizeof(struct sadb_sa));
4950
4951 MGETHDR(n, M_NOWAIT, MT_DATA);
4952 if (len > MHLEN) {
4953 if (!(MCLGET(n, M_NOWAIT))) {
4954 m_freem(n);
4955 n = NULL;
4956 }
4957 }
4958 if (!n) {
4959 error = ENOBUFS;
4960 goto fail;
4961 }
4962
4963 n->m_len = len;
4964 n->m_next = NULL;
4965 off = 0;
4966
4967 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
4968 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
4969
4970 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off);
4971 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa));
4972 m_sa->sadb_sa_exttype = SADB_EXT_SA;
4973 m_sa->sadb_sa_spi = spi; /* SPI is already in network byte order */
4974 off += PFKEY_ALIGN8(sizeof(struct sadb_sa));
4975
4976 IPSEC_ASSERT(off == len,
4977 ("length inconsistency (off %u len %u)", off, len));
4978
4979 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC,
4980 SADB_EXT_ADDRESS_DST);
4981 if (!n->m_next) {
4982 m_freem(n);
4983 error = ENOBUFS;
4984 goto fail;
4985 }
4986
4987 if (n->m_len < sizeof(struct sadb_msg)) {
4988 n = m_pullup(n, sizeof(struct sadb_msg));
4989 if (n == NULL)
4990 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
4991 }
4992
4993 n->m_pkthdr.len = 0;
4994 for (nn = n; nn; nn = nn->m_next)
4995 n->m_pkthdr.len += nn->m_len;
4996
4997 newmsg = mtod(n, struct sadb_msg *);
4998 newmsg->sadb_msg_seq = sav->seq;
4999 newmsg->sadb_msg_errno = 0;
5000 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
5001
5002 m_freem(m);
5003 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
5004 }
5005
5006 fail:
5007 return (key_senderror(so, m, error));
5008 }
5009
5010 /*
5011 * allocating new SPI
5012 * called by key_getspi().
5013 * OUT:
5014 * 0: failure.
5015 * others: success, SPI in network byte order.
5016 */
5017 static uint32_t
key_do_getnewspi(struct sadb_spirange * spirange,struct secasindex * saidx)5018 key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx)
5019 {
5020 uint32_t min, max, newspi, t;
5021 int count = V_key_spi_trycnt;
5022
5023 /* set spi range to allocate */
5024 if (spirange != NULL) {
5025 min = spirange->sadb_spirange_min;
5026 max = spirange->sadb_spirange_max;
5027 } else {
5028 min = V_key_spi_minval;
5029 max = V_key_spi_maxval;
5030 }
5031 /* IPCOMP needs 2-byte SPI */
5032 if (saidx->proto == IPPROTO_IPCOMP) {
5033 if (min >= 0x10000)
5034 min = 0xffff;
5035 if (max >= 0x10000)
5036 max = 0xffff;
5037 if (min > max) {
5038 t = min; min = max; max = t;
5039 }
5040 }
5041
5042 if (min == max) {
5043 if (key_checkspidup(htonl(min))) {
5044 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n",
5045 __func__, min));
5046 return 0;
5047 }
5048
5049 count--; /* taking one cost. */
5050 newspi = min;
5051 } else {
5052
5053 /* init SPI */
5054 newspi = 0;
5055
5056 /* when requesting to allocate spi ranged */
5057 while (count--) {
5058 /* generate pseudo-random SPI value ranged. */
5059 newspi = min + (key_random() % (max - min + 1));
5060 if (!key_checkspidup(htonl(newspi)))
5061 break;
5062 }
5063
5064 if (count == 0 || newspi == 0) {
5065 ipseclog((LOG_DEBUG,
5066 "%s: failed to allocate SPI.\n", __func__));
5067 return 0;
5068 }
5069 }
5070
5071 /* statistics */
5072 keystat.getspi_count =
5073 (keystat.getspi_count + V_key_spi_trycnt - count) / 2;
5074
5075 return (htonl(newspi));
5076 }
5077
5078 /*
5079 * Find TCP-MD5 SA with corresponding secasindex.
5080 * If not found, return NULL and fill SPI with usable value if needed.
5081 */
5082 static struct secasvar *
key_getsav_tcpmd5(struct secasindex * saidx,uint32_t * spi)5083 key_getsav_tcpmd5(struct secasindex *saidx, uint32_t *spi)
5084 {
5085 SAHTREE_RLOCK_TRACKER;
5086 struct secashead *sah;
5087 struct secasvar *sav;
5088
5089 IPSEC_ASSERT(saidx->proto == IPPROTO_TCP, ("wrong proto"));
5090 SAHTREE_RLOCK();
5091 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
5092 if (sah->saidx.proto != IPPROTO_TCP)
5093 continue;
5094 if (!key_sockaddrcmp(&saidx->dst.sa, &sah->saidx.dst.sa, 0) &&
5095 !key_sockaddrcmp(&saidx->src.sa, &sah->saidx.src.sa, 0))
5096 break;
5097 }
5098 if (sah != NULL) {
5099 if (V_key_preferred_oldsa)
5100 sav = TAILQ_LAST(&sah->savtree_alive, secasvar_queue);
5101 else
5102 sav = TAILQ_FIRST(&sah->savtree_alive);
5103 if (sav != NULL) {
5104 SAV_ADDREF(sav);
5105 SAHTREE_RUNLOCK();
5106 return (sav);
5107 }
5108 }
5109 if (spi == NULL) {
5110 /* No SPI required */
5111 SAHTREE_RUNLOCK();
5112 return (NULL);
5113 }
5114 /* Check that SPI is unique */
5115 LIST_FOREACH(sav, SAVHASH_HASH(*spi), spihash) {
5116 if (sav->spi == *spi)
5117 break;
5118 }
5119 if (sav == NULL) {
5120 SAHTREE_RUNLOCK();
5121 /* SPI is already unique */
5122 return (NULL);
5123 }
5124 SAHTREE_RUNLOCK();
5125 /* XXX: not optimal */
5126 *spi = key_do_getnewspi(NULL, saidx);
5127 return (NULL);
5128 }
5129
5130 static int
key_updateaddresses(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp,struct secasvar * sav,struct secasindex * saidx)5131 key_updateaddresses(struct socket *so, struct mbuf *m,
5132 const struct sadb_msghdr *mhp, struct secasvar *sav,
5133 struct secasindex *saidx)
5134 {
5135 struct sockaddr *newaddr;
5136 struct secashead *sah;
5137 struct secasvar *newsav, *tmp;
5138 struct mbuf *n;
5139 int error, isnew;
5140
5141 /* Check that we need to change SAH */
5142 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC)) {
5143 newaddr = (struct sockaddr *)(
5144 ((struct sadb_address *)
5145 mhp->ext[SADB_X_EXT_NEW_ADDRESS_SRC]) + 1);
5146 bcopy(newaddr, &saidx->src, newaddr->sa_len);
5147 key_porttosaddr(&saidx->src.sa, 0);
5148 }
5149 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST)) {
5150 newaddr = (struct sockaddr *)(
5151 ((struct sadb_address *)
5152 mhp->ext[SADB_X_EXT_NEW_ADDRESS_DST]) + 1);
5153 bcopy(newaddr, &saidx->dst, newaddr->sa_len);
5154 key_porttosaddr(&saidx->dst.sa, 0);
5155 }
5156 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC) ||
5157 !SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST)) {
5158 error = key_checksockaddrs(&saidx->src.sa, &saidx->dst.sa);
5159 if (error != 0) {
5160 ipseclog((LOG_DEBUG, "%s: invalid new sockaddr.\n",
5161 __func__));
5162 return (error);
5163 }
5164
5165 sah = key_getsah(saidx);
5166 if (sah == NULL) {
5167 /* create a new SA index */
5168 sah = key_newsah(saidx);
5169 if (sah == NULL) {
5170 ipseclog((LOG_DEBUG,
5171 "%s: No more memory.\n", __func__));
5172 return (ENOBUFS);
5173 }
5174 isnew = 2; /* SAH is new */
5175 } else
5176 isnew = 1; /* existing SAH is referenced */
5177 } else {
5178 /*
5179 * src and dst addresses are still the same.
5180 * Do we want to change NAT-T config?
5181 */
5182 if (sav->sah->saidx.proto != IPPROTO_ESP ||
5183 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5184 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_SPORT) ||
5185 SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5186 ipseclog((LOG_DEBUG,
5187 "%s: invalid message: missing required header.\n",
5188 __func__));
5189 return (EINVAL);
5190 }
5191 /* We hold reference to SA, thus SAH will be referenced too. */
5192 sah = sav->sah;
5193 isnew = 0;
5194 }
5195
5196 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA,
5197 M_NOWAIT | M_ZERO);
5198 if (newsav == NULL) {
5199 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5200 error = ENOBUFS;
5201 goto fail;
5202 }
5203
5204 /* Clone SA's content into newsav */
5205 SAV_INITREF(newsav);
5206 bcopy(sav, newsav, offsetof(struct secasvar, chain));
5207 /*
5208 * We create new NAT-T config if it is needed.
5209 * Old NAT-T config will be freed by key_cleansav() when
5210 * last reference to SA will be released.
5211 */
5212 newsav->natt = NULL;
5213 newsav->sah = sah;
5214 newsav->state = SADB_SASTATE_MATURE;
5215 error = key_setnatt(newsav, mhp);
5216 if (error != 0)
5217 goto fail;
5218
5219 SAHTREE_WLOCK();
5220 /* Check that SA is still alive */
5221 if (sav->state == SADB_SASTATE_DEAD) {
5222 /* SA was unlinked */
5223 SAHTREE_WUNLOCK();
5224 error = ESRCH;
5225 goto fail;
5226 }
5227
5228 /* Unlink SA from SAH and SPI hash */
5229 IPSEC_ASSERT((sav->flags & SADB_X_EXT_F_CLONED) == 0,
5230 ("SA is already cloned"));
5231 IPSEC_ASSERT(sav->state == SADB_SASTATE_MATURE ||
5232 sav->state == SADB_SASTATE_DYING,
5233 ("Wrong SA state %u\n", sav->state));
5234 TAILQ_REMOVE(&sav->sah->savtree_alive, sav, chain);
5235 LIST_REMOVE(sav, spihash);
5236 sav->state = SADB_SASTATE_DEAD;
5237
5238 /*
5239 * Link new SA with SAH. Keep SAs ordered by
5240 * create time (newer are first).
5241 */
5242 TAILQ_FOREACH(tmp, &sah->savtree_alive, chain) {
5243 if (newsav->created > tmp->created) {
5244 TAILQ_INSERT_BEFORE(tmp, newsav, chain);
5245 break;
5246 }
5247 }
5248 if (tmp == NULL)
5249 TAILQ_INSERT_TAIL(&sah->savtree_alive, newsav, chain);
5250
5251 /* Add new SA into SPI hash. */
5252 LIST_INSERT_HEAD(SAVHASH_HASH(newsav->spi), newsav, spihash);
5253
5254 /* Add new SAH into SADB. */
5255 if (isnew == 2) {
5256 TAILQ_INSERT_HEAD(&V_sahtree, sah, chain);
5257 LIST_INSERT_HEAD(SAHADDRHASH_HASH(saidx), sah, addrhash);
5258 sah->state = SADB_SASTATE_MATURE;
5259 SAH_ADDREF(sah); /* newsav references new SAH */
5260 }
5261 /*
5262 * isnew == 1 -> @sah was referenced by key_getsah().
5263 * isnew == 0 -> we use the same @sah, that was used by @sav,
5264 * and we use its reference for @newsav.
5265 */
5266 SECASVAR_LOCK(sav);
5267 /* XXX: replace cntr with pointer? */
5268 newsav->cntr = sav->cntr;
5269 sav->flags |= SADB_X_EXT_F_CLONED;
5270 SECASVAR_UNLOCK(sav);
5271
5272 SAHTREE_WUNLOCK();
5273
5274 KEYDBG(KEY_STAMP,
5275 printf("%s: SA(%p) cloned into SA(%p)\n",
5276 __func__, sav, newsav));
5277 KEYDBG(KEY_DATA, kdebug_secasv(newsav));
5278
5279 key_freesav(&sav); /* release last reference */
5280
5281 /* set msg buf from mhp */
5282 n = key_getmsgbuf_x1(m, mhp);
5283 if (n == NULL) {
5284 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5285 return (ENOBUFS);
5286 }
5287 m_freem(m);
5288 key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5289 return (0);
5290 fail:
5291 if (isnew != 0)
5292 key_freesah(&sah);
5293 if (newsav != NULL) {
5294 if (newsav->natt != NULL)
5295 free(newsav->natt, M_IPSEC_MISC);
5296 free(newsav, M_IPSEC_SA);
5297 }
5298 return (error);
5299 }
5300
5301 /*
5302 * SADB_UPDATE processing
5303 * receive
5304 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5305 * key(AE), (identity(SD),) (sensitivity)>
5306 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL.
5307 * and send
5308 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5309 * (identity(SD),) (sensitivity)>
5310 * to the ikmpd.
5311 *
5312 * m will always be freed.
5313 */
5314 static int
key_update(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)5315 key_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5316 {
5317 struct secasindex saidx;
5318 struct sadb_address *src0, *dst0;
5319 struct sadb_sa *sa0;
5320 struct secasvar *sav;
5321 uint32_t reqid;
5322 int error;
5323 uint8_t mode, proto;
5324
5325 IPSEC_ASSERT(so != NULL, ("null socket"));
5326 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5327 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5328 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5329
5330 /* map satype to proto */
5331 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5332 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5333 __func__));
5334 return key_senderror(so, m, EINVAL);
5335 }
5336
5337 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
5338 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
5339 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
5340 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
5341 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
5342 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
5343 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
5344 ipseclog((LOG_DEBUG,
5345 "%s: invalid message: missing required header.\n",
5346 __func__));
5347 return key_senderror(so, m, EINVAL);
5348 }
5349 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
5350 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
5351 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
5352 ipseclog((LOG_DEBUG,
5353 "%s: invalid message: wrong header size.\n", __func__));
5354 return key_senderror(so, m, EINVAL);
5355 }
5356 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
5357 mode = IPSEC_MODE_ANY;
5358 reqid = 0;
5359 } else {
5360 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
5361 ipseclog((LOG_DEBUG,
5362 "%s: invalid message: wrong header size.\n",
5363 __func__));
5364 return key_senderror(so, m, EINVAL);
5365 }
5366 mode = ((struct sadb_x_sa2 *)
5367 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
5368 reqid = ((struct sadb_x_sa2 *)
5369 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
5370 }
5371
5372 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5373 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
5374 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
5375
5376 /*
5377 * Only SADB_SASTATE_MATURE SAs may be submitted in an
5378 * SADB_UPDATE message.
5379 */
5380 if (sa0->sadb_sa_state != SADB_SASTATE_MATURE) {
5381 ipseclog((LOG_DEBUG, "%s: invalid state.\n", __func__));
5382 #ifdef PFKEY_STRICT_CHECKS
5383 return key_senderror(so, m, EINVAL);
5384 #endif
5385 }
5386 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
5387 (struct sockaddr *)(dst0 + 1));
5388 if (error != 0) {
5389 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
5390 return key_senderror(so, m, error);
5391 }
5392 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
5393 sav = key_getsavbyspi(sa0->sadb_sa_spi);
5394 if (sav == NULL) {
5395 ipseclog((LOG_DEBUG, "%s: no SA found for SPI %u\n",
5396 __func__, ntohl(sa0->sadb_sa_spi)));
5397 return key_senderror(so, m, EINVAL);
5398 }
5399 /*
5400 * Check that SADB_UPDATE issued by the same process that did
5401 * SADB_GETSPI or SADB_ADD.
5402 */
5403 if (sav->pid != mhp->msg->sadb_msg_pid) {
5404 ipseclog((LOG_DEBUG,
5405 "%s: pid mismatched (SPI %u, pid %u vs. %u)\n", __func__,
5406 ntohl(sav->spi), sav->pid, mhp->msg->sadb_msg_pid));
5407 key_freesav(&sav);
5408 return key_senderror(so, m, EINVAL);
5409 }
5410 /* saidx should match with SA. */
5411 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_MODE_REQID) == 0) {
5412 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u\n",
5413 __func__, ntohl(sav->spi)));
5414 key_freesav(&sav);
5415 return key_senderror(so, m, ESRCH);
5416 }
5417
5418 if (sav->state == SADB_SASTATE_LARVAL) {
5419 if ((mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
5420 SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT)) ||
5421 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
5422 SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH))) {
5423 ipseclog((LOG_DEBUG,
5424 "%s: invalid message: missing required header.\n",
5425 __func__));
5426 key_freesav(&sav);
5427 return key_senderror(so, m, EINVAL);
5428 }
5429 /*
5430 * We can set any values except src, dst and SPI.
5431 */
5432 error = key_setsaval(sav, mhp);
5433 if (error != 0) {
5434 key_freesav(&sav);
5435 return (key_senderror(so, m, error));
5436 }
5437 /* Change SA state to MATURE */
5438 SAHTREE_WLOCK();
5439 if (sav->state != SADB_SASTATE_LARVAL) {
5440 /* SA was deleted or another thread made it MATURE. */
5441 SAHTREE_WUNLOCK();
5442 key_freesav(&sav);
5443 return (key_senderror(so, m, ESRCH));
5444 }
5445 /*
5446 * NOTE: we keep SAs in savtree_alive ordered by created
5447 * time. When SA's state changed from LARVAL to MATURE,
5448 * we update its created time in key_setsaval() and move
5449 * it into head of savtree_alive.
5450 */
5451 TAILQ_REMOVE(&sav->sah->savtree_larval, sav, chain);
5452 TAILQ_INSERT_HEAD(&sav->sah->savtree_alive, sav, chain);
5453 sav->state = SADB_SASTATE_MATURE;
5454 SAHTREE_WUNLOCK();
5455 } else {
5456 /*
5457 * For DYING and MATURE SA we can change only state
5458 * and lifetimes. Report EINVAL if something else attempted
5459 * to change.
5460 */
5461 if (!SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT) ||
5462 !SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH)) {
5463 key_freesav(&sav);
5464 return (key_senderror(so, m, EINVAL));
5465 }
5466 error = key_updatelifetimes(sav, mhp);
5467 if (error != 0) {
5468 key_freesav(&sav);
5469 return (key_senderror(so, m, error));
5470 }
5471 /*
5472 * This is FreeBSD extension to RFC2367.
5473 * IKEd can specify SADB_X_EXT_NEW_ADDRESS_SRC and/or
5474 * SADB_X_EXT_NEW_ADDRESS_DST when it wants to change
5475 * SA addresses (for example to implement MOBIKE protocol
5476 * as described in RFC4555). Also we allow to change
5477 * NAT-T config.
5478 */
5479 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_SRC) ||
5480 !SADB_CHECKHDR(mhp, SADB_X_EXT_NEW_ADDRESS_DST) ||
5481 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5482 sav->natt != NULL) {
5483 error = key_updateaddresses(so, m, mhp, sav, &saidx);
5484 key_freesav(&sav);
5485 if (error != 0)
5486 return (key_senderror(so, m, error));
5487 return (0);
5488 }
5489 /* Check that SA is still alive */
5490 SAHTREE_WLOCK();
5491 if (sav->state == SADB_SASTATE_DEAD) {
5492 /* SA was unlinked */
5493 SAHTREE_WUNLOCK();
5494 key_freesav(&sav);
5495 return (key_senderror(so, m, ESRCH));
5496 }
5497 /*
5498 * NOTE: there is possible state moving from DYING to MATURE,
5499 * but this doesn't change created time, so we won't reorder
5500 * this SA.
5501 */
5502 sav->state = SADB_SASTATE_MATURE;
5503 SAHTREE_WUNLOCK();
5504 }
5505 KEYDBG(KEY_STAMP,
5506 printf("%s: SA(%p)\n", __func__, sav));
5507 KEYDBG(KEY_DATA, kdebug_secasv(sav));
5508 key_freesav(&sav);
5509
5510 {
5511 struct mbuf *n;
5512
5513 /* set msg buf from mhp */
5514 n = key_getmsgbuf_x1(m, mhp);
5515 if (n == NULL) {
5516 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5517 return key_senderror(so, m, ENOBUFS);
5518 }
5519
5520 m_freem(m);
5521 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5522 }
5523 }
5524
5525 /*
5526 * SADB_ADD processing
5527 * add an entry to SA database, when received
5528 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5529 * key(AE), (identity(SD),) (sensitivity)>
5530 * from the ikmpd,
5531 * and send
5532 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
5533 * (identity(SD),) (sensitivity)>
5534 * to the ikmpd.
5535 *
5536 * IGNORE identity and sensitivity messages.
5537 *
5538 * m will always be freed.
5539 */
5540 static int
key_add(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)5541 key_add(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5542 {
5543 struct secasindex saidx;
5544 struct sadb_address *src0, *dst0;
5545 struct sadb_sa *sa0;
5546 struct secasvar *sav;
5547 uint32_t reqid, spi;
5548 uint8_t mode, proto;
5549 int error;
5550
5551 IPSEC_ASSERT(so != NULL, ("null socket"));
5552 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5553 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5554 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5555
5556 /* map satype to proto */
5557 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5558 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5559 __func__));
5560 return key_senderror(so, m, EINVAL);
5561 }
5562
5563 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
5564 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
5565 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
5566 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && (
5567 SADB_CHECKHDR(mhp, SADB_EXT_KEY_ENCRYPT) ||
5568 SADB_CHECKLEN(mhp, SADB_EXT_KEY_ENCRYPT))) ||
5569 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && (
5570 SADB_CHECKHDR(mhp, SADB_EXT_KEY_AUTH) ||
5571 SADB_CHECKLEN(mhp, SADB_EXT_KEY_AUTH))) ||
5572 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD) &&
5573 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT)) ||
5574 (SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_SOFT) &&
5575 !SADB_CHECKHDR(mhp, SADB_EXT_LIFETIME_HARD))) {
5576 ipseclog((LOG_DEBUG,
5577 "%s: invalid message: missing required header.\n",
5578 __func__));
5579 return key_senderror(so, m, EINVAL);
5580 }
5581 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
5582 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
5583 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
5584 ipseclog((LOG_DEBUG,
5585 "%s: invalid message: wrong header size.\n", __func__));
5586 return key_senderror(so, m, EINVAL);
5587 }
5588 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
5589 mode = IPSEC_MODE_ANY;
5590 reqid = 0;
5591 } else {
5592 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
5593 ipseclog((LOG_DEBUG,
5594 "%s: invalid message: wrong header size.\n",
5595 __func__));
5596 return key_senderror(so, m, EINVAL);
5597 }
5598 mode = ((struct sadb_x_sa2 *)
5599 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
5600 reqid = ((struct sadb_x_sa2 *)
5601 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
5602 }
5603
5604 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5605 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
5606 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
5607
5608 /*
5609 * Only SADB_SASTATE_MATURE SAs may be submitted in an
5610 * SADB_ADD message.
5611 */
5612 if (sa0->sadb_sa_state != SADB_SASTATE_MATURE) {
5613 ipseclog((LOG_DEBUG, "%s: invalid state.\n", __func__));
5614 #ifdef PFKEY_STRICT_CHECKS
5615 return key_senderror(so, m, EINVAL);
5616 #endif
5617 }
5618 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
5619 (struct sockaddr *)(dst0 + 1));
5620 if (error != 0) {
5621 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
5622 return key_senderror(so, m, error);
5623 }
5624 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
5625 spi = sa0->sadb_sa_spi;
5626 /*
5627 * For TCP-MD5 SAs we don't use SPI. Check the uniqueness using
5628 * secasindex.
5629 * XXXAE: IPComp seems also doesn't use SPI.
5630 */
5631 if (proto == IPPROTO_TCP) {
5632 sav = key_getsav_tcpmd5(&saidx, &spi);
5633 if (sav == NULL && spi == 0) {
5634 /* Failed to allocate SPI */
5635 ipseclog((LOG_DEBUG, "%s: SA already exists.\n",
5636 __func__));
5637 return key_senderror(so, m, EEXIST);
5638 }
5639 /* XXX: SPI that we report back can have another value */
5640 } else {
5641 /* We can create new SA only if SPI is different. */
5642 sav = key_getsavbyspi(spi);
5643 }
5644 if (sav != NULL) {
5645 key_freesav(&sav);
5646 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__));
5647 return key_senderror(so, m, EEXIST);
5648 }
5649
5650 sav = key_newsav(mhp, &saidx, spi, &error);
5651 if (sav == NULL)
5652 return key_senderror(so, m, error);
5653 KEYDBG(KEY_STAMP,
5654 printf("%s: return SA(%p)\n", __func__, sav));
5655 KEYDBG(KEY_DATA, kdebug_secasv(sav));
5656 /*
5657 * If SADB_ADD was in response to SADB_ACQUIRE, we need to schedule
5658 * ACQ for deletion.
5659 */
5660 if (sav->seq != 0)
5661 key_acqdone(&saidx, sav->seq);
5662
5663 {
5664 /*
5665 * Don't call key_freesav() on error here, as we would like to
5666 * keep the SA in the database.
5667 */
5668 struct mbuf *n;
5669
5670 /* set msg buf from mhp */
5671 n = key_getmsgbuf_x1(m, mhp);
5672 if (n == NULL) {
5673 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5674 return key_senderror(so, m, ENOBUFS);
5675 }
5676
5677 m_freem(m);
5678 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5679 }
5680 }
5681
5682 /*
5683 * NAT-T support.
5684 * IKEd may request the use ESP in UDP encapsulation when it detects the
5685 * presence of NAT. It uses NAT-T extension headers for such SAs to specify
5686 * parameters needed for encapsulation and decapsulation. These PF_KEY
5687 * extension headers are not standardized, so this comment addresses our
5688 * implementation.
5689 * SADB_X_EXT_NAT_T_TYPE specifies type of encapsulation, we support only
5690 * UDP_ENCAP_ESPINUDP as described in RFC3948.
5691 * SADB_X_EXT_NAT_T_SPORT/DPORT specifies source and destination ports for
5692 * UDP header. We use these ports in UDP encapsulation procedure, also we
5693 * can check them in UDP decapsulation procedure.
5694 * SADB_X_EXT_NAT_T_OA[IR] specifies original address of initiator or
5695 * responder. These addresses can be used for transport mode to adjust
5696 * checksum after decapsulation and decryption. Since original IP addresses
5697 * used by peer usually different (we detected presence of NAT), TCP/UDP
5698 * pseudo header checksum and IP header checksum was calculated using original
5699 * addresses. After decapsulation and decryption we need to adjust checksum
5700 * to have correct datagram.
5701 *
5702 * We expect presence of NAT-T extension headers only in SADB_ADD and
5703 * SADB_UPDATE messages. We report NAT-T extension headers in replies
5704 * to SADB_ADD, SADB_UPDATE, SADB_GET, and SADB_DUMP messages.
5705 */
5706 static int
key_setnatt(struct secasvar * sav,const struct sadb_msghdr * mhp)5707 key_setnatt(struct secasvar *sav, const struct sadb_msghdr *mhp)
5708 {
5709 struct sadb_x_nat_t_port *port;
5710 struct sadb_x_nat_t_type *type;
5711 struct sadb_address *oai, *oar;
5712 struct sockaddr *sa;
5713 uint32_t addr;
5714 uint16_t cksum;
5715
5716 IPSEC_ASSERT(sav->natt == NULL, ("natt is already initialized"));
5717 /*
5718 * Ignore NAT-T headers if sproto isn't ESP.
5719 */
5720 if (sav->sah->saidx.proto != IPPROTO_ESP)
5721 return (0);
5722
5723 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_TYPE) &&
5724 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_SPORT) &&
5725 !SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5726 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_TYPE) ||
5727 SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_SPORT) ||
5728 SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_DPORT)) {
5729 ipseclog((LOG_DEBUG,
5730 "%s: invalid message: wrong header size.\n",
5731 __func__));
5732 return (EINVAL);
5733 }
5734 } else
5735 return (0);
5736
5737 type = (struct sadb_x_nat_t_type *)mhp->ext[SADB_X_EXT_NAT_T_TYPE];
5738 if (type->sadb_x_nat_t_type_type != UDP_ENCAP_ESPINUDP) {
5739 ipseclog((LOG_DEBUG, "%s: unsupported NAT-T type %u.\n",
5740 __func__, type->sadb_x_nat_t_type_type));
5741 return (EINVAL);
5742 }
5743 /*
5744 * Allocate storage for NAT-T config.
5745 * On error it will be released by key_cleansav().
5746 */
5747 sav->natt = malloc(sizeof(struct secnatt), M_IPSEC_MISC,
5748 M_NOWAIT | M_ZERO);
5749 if (sav->natt == NULL) {
5750 PFKEYSTAT_INC(in_nomem);
5751 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5752 return (ENOBUFS);
5753 }
5754 port = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_SPORT];
5755 if (port->sadb_x_nat_t_port_port == 0) {
5756 ipseclog((LOG_DEBUG, "%s: invalid NAT-T sport specified.\n",
5757 __func__));
5758 return (EINVAL);
5759 }
5760 sav->natt->sport = port->sadb_x_nat_t_port_port;
5761 port = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_DPORT];
5762 if (port->sadb_x_nat_t_port_port == 0) {
5763 ipseclog((LOG_DEBUG, "%s: invalid NAT-T dport specified.\n",
5764 __func__));
5765 return (EINVAL);
5766 }
5767 sav->natt->dport = port->sadb_x_nat_t_port_port;
5768
5769 /*
5770 * SADB_X_EXT_NAT_T_OAI and SADB_X_EXT_NAT_T_OAR are optional
5771 * and needed only for transport mode IPsec.
5772 * Usually NAT translates only one address, but it is possible,
5773 * that both addresses could be translated.
5774 * NOTE: Value of SADB_X_EXT_NAT_T_OAI is equal to SADB_X_EXT_NAT_T_OA.
5775 */
5776 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_OAI)) {
5777 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_OAI)) {
5778 ipseclog((LOG_DEBUG,
5779 "%s: invalid message: wrong header size.\n",
5780 __func__));
5781 return (EINVAL);
5782 }
5783 oai = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI];
5784 } else
5785 oai = NULL;
5786 if (!SADB_CHECKHDR(mhp, SADB_X_EXT_NAT_T_OAR)) {
5787 if (SADB_CHECKLEN(mhp, SADB_X_EXT_NAT_T_OAR)) {
5788 ipseclog((LOG_DEBUG,
5789 "%s: invalid message: wrong header size.\n",
5790 __func__));
5791 return (EINVAL);
5792 }
5793 oar = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR];
5794 } else
5795 oar = NULL;
5796
5797 /* Initialize addresses only for transport mode */
5798 if (sav->sah->saidx.mode != IPSEC_MODE_TUNNEL) {
5799 cksum = 0;
5800 if (oai != NULL) {
5801 /* Currently we support only AF_INET */
5802 sa = (struct sockaddr *)(oai + 1);
5803 if (sa->sa_family != AF_INET ||
5804 sa->sa_len != sizeof(struct sockaddr_in)) {
5805 ipseclog((LOG_DEBUG,
5806 "%s: wrong NAT-OAi header.\n",
5807 __func__));
5808 return (EINVAL);
5809 }
5810 /* Ignore address if it the same */
5811 if (((struct sockaddr_in *)sa)->sin_addr.s_addr !=
5812 sav->sah->saidx.src.sin.sin_addr.s_addr) {
5813 bcopy(sa, &sav->natt->oai.sa, sa->sa_len);
5814 sav->natt->flags |= IPSEC_NATT_F_OAI;
5815 /* Calculate checksum delta */
5816 addr = sav->sah->saidx.src.sin.sin_addr.s_addr;
5817 cksum = in_addword(cksum, ~addr >> 16);
5818 cksum = in_addword(cksum, ~addr & 0xffff);
5819 addr = sav->natt->oai.sin.sin_addr.s_addr;
5820 cksum = in_addword(cksum, addr >> 16);
5821 cksum = in_addword(cksum, addr & 0xffff);
5822 }
5823 }
5824 if (oar != NULL) {
5825 /* Currently we support only AF_INET */
5826 sa = (struct sockaddr *)(oar + 1);
5827 if (sa->sa_family != AF_INET ||
5828 sa->sa_len != sizeof(struct sockaddr_in)) {
5829 ipseclog((LOG_DEBUG,
5830 "%s: wrong NAT-OAr header.\n",
5831 __func__));
5832 return (EINVAL);
5833 }
5834 /* Ignore address if it the same */
5835 if (((struct sockaddr_in *)sa)->sin_addr.s_addr !=
5836 sav->sah->saidx.dst.sin.sin_addr.s_addr) {
5837 bcopy(sa, &sav->natt->oar.sa, sa->sa_len);
5838 sav->natt->flags |= IPSEC_NATT_F_OAR;
5839 /* Calculate checksum delta */
5840 addr = sav->sah->saidx.dst.sin.sin_addr.s_addr;
5841 cksum = in_addword(cksum, ~addr >> 16);
5842 cksum = in_addword(cksum, ~addr & 0xffff);
5843 addr = sav->natt->oar.sin.sin_addr.s_addr;
5844 cksum = in_addword(cksum, addr >> 16);
5845 cksum = in_addword(cksum, addr & 0xffff);
5846 }
5847 }
5848 sav->natt->cksum = cksum;
5849 }
5850 return (0);
5851 }
5852
5853 static int
key_setident(struct secashead * sah,const struct sadb_msghdr * mhp)5854 key_setident(struct secashead *sah, const struct sadb_msghdr *mhp)
5855 {
5856 const struct sadb_ident *idsrc, *iddst;
5857
5858 IPSEC_ASSERT(sah != NULL, ("null secashead"));
5859 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5860 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5861
5862 /* don't make buffer if not there */
5863 if (SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_SRC) &&
5864 SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_DST)) {
5865 sah->idents = NULL;
5866 sah->identd = NULL;
5867 return (0);
5868 }
5869
5870 if (SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_SRC) ||
5871 SADB_CHECKHDR(mhp, SADB_EXT_IDENTITY_DST)) {
5872 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__));
5873 return (EINVAL);
5874 }
5875
5876 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC];
5877 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST];
5878
5879 /* validity check */
5880 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) {
5881 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__));
5882 return EINVAL;
5883 }
5884
5885 switch (idsrc->sadb_ident_type) {
5886 case SADB_IDENTTYPE_PREFIX:
5887 case SADB_IDENTTYPE_FQDN:
5888 case SADB_IDENTTYPE_USERFQDN:
5889 default:
5890 /* XXX do nothing */
5891 sah->idents = NULL;
5892 sah->identd = NULL;
5893 return 0;
5894 }
5895
5896 /* make structure */
5897 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
5898 if (sah->idents == NULL) {
5899 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5900 return ENOBUFS;
5901 }
5902 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
5903 if (sah->identd == NULL) {
5904 free(sah->idents, M_IPSEC_MISC);
5905 sah->idents = NULL;
5906 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5907 return ENOBUFS;
5908 }
5909 sah->idents->type = idsrc->sadb_ident_type;
5910 sah->idents->id = idsrc->sadb_ident_id;
5911
5912 sah->identd->type = iddst->sadb_ident_type;
5913 sah->identd->id = iddst->sadb_ident_id;
5914
5915 return 0;
5916 }
5917
5918 /*
5919 * m will not be freed on return.
5920 * it is caller's responsibility to free the result.
5921 *
5922 * Called from SADB_ADD and SADB_UPDATE. Reply will contain headers
5923 * from the request in defined order.
5924 */
5925 static struct mbuf *
key_getmsgbuf_x1(struct mbuf * m,const struct sadb_msghdr * mhp)5926 key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp)
5927 {
5928 struct mbuf *n;
5929
5930 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5931 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5932 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5933
5934 /* create new sadb_msg to reply. */
5935 n = key_gather_mbuf(m, mhp, 1, 16, SADB_EXT_RESERVED,
5936 SADB_EXT_SA, SADB_X_EXT_SA2,
5937 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST,
5938 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
5939 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST,
5940 SADB_X_EXT_NAT_T_TYPE, SADB_X_EXT_NAT_T_SPORT,
5941 SADB_X_EXT_NAT_T_DPORT, SADB_X_EXT_NAT_T_OAI,
5942 SADB_X_EXT_NAT_T_OAR, SADB_X_EXT_NEW_ADDRESS_SRC,
5943 SADB_X_EXT_NEW_ADDRESS_DST);
5944 if (!n)
5945 return NULL;
5946
5947 if (n->m_len < sizeof(struct sadb_msg)) {
5948 n = m_pullup(n, sizeof(struct sadb_msg));
5949 if (n == NULL)
5950 return NULL;
5951 }
5952 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0;
5953 mtod(n, struct sadb_msg *)->sadb_msg_len =
5954 PFKEY_UNIT64(n->m_pkthdr.len);
5955
5956 return n;
5957 }
5958
5959 /*
5960 * SADB_DELETE processing
5961 * receive
5962 * <base, SA(*), address(SD)>
5963 * from the ikmpd, and set SADB_SASTATE_DEAD,
5964 * and send,
5965 * <base, SA(*), address(SD)>
5966 * to the ikmpd.
5967 *
5968 * m will always be freed.
5969 */
5970 static int
key_delete(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)5971 key_delete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5972 {
5973 struct secasindex saidx;
5974 struct sadb_address *src0, *dst0;
5975 struct secasvar *sav;
5976 struct sadb_sa *sa0;
5977 uint8_t proto;
5978
5979 IPSEC_ASSERT(so != NULL, ("null socket"));
5980 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5981 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5982 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5983
5984 /* map satype to proto */
5985 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5986 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5987 __func__));
5988 return key_senderror(so, m, EINVAL);
5989 }
5990
5991 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
5992 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
5993 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
5994 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
5995 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
5996 __func__));
5997 return key_senderror(so, m, EINVAL);
5998 }
5999
6000 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
6001 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
6002
6003 if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
6004 (struct sockaddr *)(dst0 + 1)) != 0) {
6005 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
6006 return (key_senderror(so, m, EINVAL));
6007 }
6008 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
6009 if (SADB_CHECKHDR(mhp, SADB_EXT_SA)) {
6010 /*
6011 * Caller wants us to delete all non-LARVAL SAs
6012 * that match the src/dst. This is used during
6013 * IKE INITIAL-CONTACT.
6014 * XXXAE: this looks like some extension to RFC2367.
6015 */
6016 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__));
6017 return (key_delete_all(so, m, mhp, &saidx));
6018 }
6019 if (SADB_CHECKLEN(mhp, SADB_EXT_SA)) {
6020 ipseclog((LOG_DEBUG,
6021 "%s: invalid message: wrong header size.\n", __func__));
6022 return (key_senderror(so, m, EINVAL));
6023 }
6024 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
6025 if (proto == IPPROTO_TCP)
6026 sav = key_getsav_tcpmd5(&saidx, NULL);
6027 else
6028 sav = key_getsavbyspi(sa0->sadb_sa_spi);
6029 if (sav == NULL) {
6030 ipseclog((LOG_DEBUG, "%s: no SA found for SPI %u.\n",
6031 __func__, ntohl(sa0->sadb_sa_spi)));
6032 return (key_senderror(so, m, ESRCH));
6033 }
6034 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_HEAD) == 0) {
6035 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u.\n",
6036 __func__, ntohl(sav->spi)));
6037 key_freesav(&sav);
6038 return (key_senderror(so, m, ESRCH));
6039 }
6040 KEYDBG(KEY_STAMP,
6041 printf("%s: SA(%p)\n", __func__, sav));
6042 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6043 key_unlinksav(sav);
6044 key_freesav(&sav);
6045
6046 {
6047 struct mbuf *n;
6048 struct sadb_msg *newmsg;
6049
6050 /* create new sadb_msg to reply. */
6051 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
6052 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
6053 if (!n)
6054 return key_senderror(so, m, ENOBUFS);
6055
6056 if (n->m_len < sizeof(struct sadb_msg)) {
6057 n = m_pullup(n, sizeof(struct sadb_msg));
6058 if (n == NULL)
6059 return key_senderror(so, m, ENOBUFS);
6060 }
6061 newmsg = mtod(n, struct sadb_msg *);
6062 newmsg->sadb_msg_errno = 0;
6063 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
6064
6065 m_freem(m);
6066 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
6067 }
6068 }
6069
6070 /*
6071 * delete all SAs for src/dst. Called from key_delete().
6072 */
6073 static int
key_delete_all(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp,struct secasindex * saidx)6074 key_delete_all(struct socket *so, struct mbuf *m,
6075 const struct sadb_msghdr *mhp, struct secasindex *saidx)
6076 {
6077 struct secasvar_queue drainq;
6078 struct secashead *sah;
6079 struct secasvar *sav, *nextsav;
6080
6081 TAILQ_INIT(&drainq);
6082 SAHTREE_WLOCK();
6083 LIST_FOREACH(sah, SAHADDRHASH_HASH(saidx), addrhash) {
6084 if (key_cmpsaidx(&sah->saidx, saidx, CMP_HEAD) == 0)
6085 continue;
6086 /* Move all ALIVE SAs into drainq */
6087 TAILQ_CONCAT(&drainq, &sah->savtree_alive, chain);
6088 }
6089 /* Unlink all queued SAs from SPI hash */
6090 TAILQ_FOREACH(sav, &drainq, chain) {
6091 sav->state = SADB_SASTATE_DEAD;
6092 LIST_REMOVE(sav, spihash);
6093 }
6094 SAHTREE_WUNLOCK();
6095 /* Now we can release reference for all SAs in drainq */
6096 sav = TAILQ_FIRST(&drainq);
6097 while (sav != NULL) {
6098 KEYDBG(KEY_STAMP,
6099 printf("%s: SA(%p)\n", __func__, sav));
6100 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6101 nextsav = TAILQ_NEXT(sav, chain);
6102 key_freesah(&sav->sah); /* release reference from SAV */
6103 key_freesav(&sav); /* release last reference */
6104 sav = nextsav;
6105 }
6106
6107 {
6108 struct mbuf *n;
6109 struct sadb_msg *newmsg;
6110
6111 /* create new sadb_msg to reply. */
6112 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED,
6113 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
6114 if (!n)
6115 return key_senderror(so, m, ENOBUFS);
6116
6117 if (n->m_len < sizeof(struct sadb_msg)) {
6118 n = m_pullup(n, sizeof(struct sadb_msg));
6119 if (n == NULL)
6120 return key_senderror(so, m, ENOBUFS);
6121 }
6122 newmsg = mtod(n, struct sadb_msg *);
6123 newmsg->sadb_msg_errno = 0;
6124 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
6125
6126 m_freem(m);
6127 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
6128 }
6129 }
6130
6131 /*
6132 * Delete all alive SAs for corresponding xform.
6133 * Larval SAs have not initialized tdb_xform, so it is safe to leave them
6134 * here when xform disappears.
6135 */
6136 void
key_delete_xform(const struct xformsw * xsp)6137 key_delete_xform(const struct xformsw *xsp)
6138 {
6139 struct secasvar_queue drainq;
6140 struct secashead *sah;
6141 struct secasvar *sav, *nextsav;
6142
6143 TAILQ_INIT(&drainq);
6144 SAHTREE_WLOCK();
6145 TAILQ_FOREACH(sah, &V_sahtree, chain) {
6146 sav = TAILQ_FIRST(&sah->savtree_alive);
6147 if (sav == NULL)
6148 continue;
6149 if (sav->tdb_xform != xsp)
6150 continue;
6151 /*
6152 * It is supposed that all SAs in the chain are related to
6153 * one xform.
6154 */
6155 TAILQ_CONCAT(&drainq, &sah->savtree_alive, chain);
6156 }
6157 /* Unlink all queued SAs from SPI hash */
6158 TAILQ_FOREACH(sav, &drainq, chain) {
6159 sav->state = SADB_SASTATE_DEAD;
6160 LIST_REMOVE(sav, spihash);
6161 }
6162 SAHTREE_WUNLOCK();
6163
6164 /* Now we can release reference for all SAs in drainq */
6165 sav = TAILQ_FIRST(&drainq);
6166 while (sav != NULL) {
6167 KEYDBG(KEY_STAMP,
6168 printf("%s: SA(%p)\n", __func__, sav));
6169 KEYDBG(KEY_DATA, kdebug_secasv(sav));
6170 nextsav = TAILQ_NEXT(sav, chain);
6171 key_freesah(&sav->sah); /* release reference from SAV */
6172 key_freesav(&sav); /* release last reference */
6173 sav = nextsav;
6174 }
6175 }
6176
6177 /*
6178 * SADB_GET processing
6179 * receive
6180 * <base, SA(*), address(SD)>
6181 * from the ikmpd, and get a SP and a SA to respond,
6182 * and send,
6183 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE),
6184 * (identity(SD),) (sensitivity)>
6185 * to the ikmpd.
6186 *
6187 * m will always be freed.
6188 */
6189 static int
key_get(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)6190 key_get(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6191 {
6192 struct secasindex saidx;
6193 struct sadb_address *src0, *dst0;
6194 struct sadb_sa *sa0;
6195 struct secasvar *sav;
6196 uint8_t proto;
6197
6198 IPSEC_ASSERT(so != NULL, ("null socket"));
6199 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6200 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6201 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6202
6203 /* map satype to proto */
6204 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6205 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
6206 __func__));
6207 return key_senderror(so, m, EINVAL);
6208 }
6209
6210 if (SADB_CHECKHDR(mhp, SADB_EXT_SA) ||
6211 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
6212 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST)) {
6213 ipseclog((LOG_DEBUG,
6214 "%s: invalid message: missing required header.\n",
6215 __func__));
6216 return key_senderror(so, m, EINVAL);
6217 }
6218 if (SADB_CHECKLEN(mhp, SADB_EXT_SA) ||
6219 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
6220 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST)) {
6221 ipseclog((LOG_DEBUG,
6222 "%s: invalid message: wrong header size.\n", __func__));
6223 return key_senderror(so, m, EINVAL);
6224 }
6225
6226 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
6227 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
6228 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
6229
6230 if (key_checksockaddrs((struct sockaddr *)(src0 + 1),
6231 (struct sockaddr *)(dst0 + 1)) != 0) {
6232 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
6233 return key_senderror(so, m, EINVAL);
6234 }
6235 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
6236
6237 if (proto == IPPROTO_TCP)
6238 sav = key_getsav_tcpmd5(&saidx, NULL);
6239 else
6240 sav = key_getsavbyspi(sa0->sadb_sa_spi);
6241 if (sav == NULL) {
6242 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__));
6243 return key_senderror(so, m, ESRCH);
6244 }
6245 if (key_cmpsaidx(&sav->sah->saidx, &saidx, CMP_HEAD) == 0) {
6246 ipseclog((LOG_DEBUG, "%s: saidx mismatched for SPI %u.\n",
6247 __func__, ntohl(sa0->sadb_sa_spi)));
6248 key_freesav(&sav);
6249 return (key_senderror(so, m, ESRCH));
6250 }
6251
6252 {
6253 struct mbuf *n;
6254 uint8_t satype;
6255
6256 /* map proto to satype */
6257 if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0) {
6258 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n",
6259 __func__));
6260 key_freesav(&sav);
6261 return key_senderror(so, m, EINVAL);
6262 }
6263
6264 /* create new sadb_msg to reply. */
6265 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq,
6266 mhp->msg->sadb_msg_pid);
6267
6268 key_freesav(&sav);
6269 if (!n)
6270 return key_senderror(so, m, ENOBUFS);
6271
6272 m_freem(m);
6273 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
6274 }
6275 }
6276
6277 /* XXX make it sysctl-configurable? */
6278 static void
key_getcomb_setlifetime(struct sadb_comb * comb)6279 key_getcomb_setlifetime(struct sadb_comb *comb)
6280 {
6281
6282 comb->sadb_comb_soft_allocations = 1;
6283 comb->sadb_comb_hard_allocations = 1;
6284 comb->sadb_comb_soft_bytes = 0;
6285 comb->sadb_comb_hard_bytes = 0;
6286 comb->sadb_comb_hard_addtime = 86400; /* 1 day */
6287 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100;
6288 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */
6289 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100;
6290 }
6291
6292 /*
6293 * XXX reorder combinations by preference
6294 * XXX no idea if the user wants ESP authentication or not
6295 */
6296 static struct mbuf *
key_getcomb_ealg(void)6297 key_getcomb_ealg(void)
6298 {
6299 struct sadb_comb *comb;
6300 const struct enc_xform *algo;
6301 struct mbuf *result = NULL, *m, *n;
6302 int encmin;
6303 int i, off, o;
6304 int totlen;
6305 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6306
6307 m = NULL;
6308 for (i = 1; i <= SADB_EALG_MAX; i++) {
6309 algo = enc_algorithm_lookup(i);
6310 if (algo == NULL)
6311 continue;
6312
6313 /* discard algorithms with key size smaller than system min */
6314 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin)
6315 continue;
6316 if (_BITS(algo->minkey) < V_ipsec_esp_keymin)
6317 encmin = V_ipsec_esp_keymin;
6318 else
6319 encmin = _BITS(algo->minkey);
6320
6321 if (V_ipsec_esp_auth)
6322 m = key_getcomb_ah();
6323 else {
6324 IPSEC_ASSERT(l <= MLEN,
6325 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6326 MGET(m, M_NOWAIT, MT_DATA);
6327 if (m) {
6328 M_ALIGN(m, l);
6329 m->m_len = l;
6330 m->m_next = NULL;
6331 bzero(mtod(m, caddr_t), m->m_len);
6332 }
6333 }
6334 if (!m)
6335 goto fail;
6336
6337 totlen = 0;
6338 for (n = m; n; n = n->m_next)
6339 totlen += n->m_len;
6340 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l));
6341
6342 for (off = 0; off < totlen; off += l) {
6343 n = m_pulldown(m, off, l, &o);
6344 if (!n) {
6345 /* m is already freed */
6346 goto fail;
6347 }
6348 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o);
6349 bzero(comb, sizeof(*comb));
6350 key_getcomb_setlifetime(comb);
6351 comb->sadb_comb_encrypt = i;
6352 comb->sadb_comb_encrypt_minbits = encmin;
6353 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey);
6354 }
6355
6356 if (!result)
6357 result = m;
6358 else
6359 m_cat(result, m);
6360 }
6361
6362 return result;
6363
6364 fail:
6365 if (result)
6366 m_freem(result);
6367 return NULL;
6368 }
6369
6370 static void
key_getsizes_ah(const struct auth_hash * ah,int alg,u_int16_t * min,u_int16_t * max)6371 key_getsizes_ah(const struct auth_hash *ah, int alg, u_int16_t* min,
6372 u_int16_t* max)
6373 {
6374
6375 *min = *max = ah->hashsize;
6376 if (ah->keysize == 0) {
6377 /*
6378 * Transform takes arbitrary key size but algorithm
6379 * key size is restricted. Enforce this here.
6380 */
6381 switch (alg) {
6382 case SADB_X_AALG_MD5: *min = *max = 16; break;
6383 case SADB_X_AALG_SHA: *min = *max = 20; break;
6384 case SADB_X_AALG_NULL: *min = 1; *max = 256; break;
6385 case SADB_X_AALG_SHA2_256: *min = *max = 32; break;
6386 case SADB_X_AALG_SHA2_384: *min = *max = 48; break;
6387 case SADB_X_AALG_SHA2_512: *min = *max = 64; break;
6388 default:
6389 DPRINTF(("%s: unknown AH algorithm %u\n",
6390 __func__, alg));
6391 break;
6392 }
6393 }
6394 }
6395
6396 /*
6397 * XXX reorder combinations by preference
6398 */
6399 static struct mbuf *
key_getcomb_ah(void)6400 key_getcomb_ah(void)
6401 {
6402 const struct auth_hash *algo;
6403 struct sadb_comb *comb;
6404 struct mbuf *m;
6405 u_int16_t minkeysize, maxkeysize;
6406 int i;
6407 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6408
6409 m = NULL;
6410 for (i = 1; i <= SADB_AALG_MAX; i++) {
6411 #if 1
6412 /* we prefer HMAC algorithms, not old algorithms */
6413 if (i != SADB_AALG_SHA1HMAC &&
6414 i != SADB_AALG_MD5HMAC &&
6415 i != SADB_X_AALG_SHA2_256 &&
6416 i != SADB_X_AALG_SHA2_384 &&
6417 i != SADB_X_AALG_SHA2_512)
6418 continue;
6419 #endif
6420 algo = auth_algorithm_lookup(i);
6421 if (!algo)
6422 continue;
6423 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize);
6424 /* discard algorithms with key size smaller than system min */
6425 if (_BITS(minkeysize) < V_ipsec_ah_keymin)
6426 continue;
6427
6428 if (!m) {
6429 IPSEC_ASSERT(l <= MLEN,
6430 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6431 MGET(m, M_NOWAIT, MT_DATA);
6432 if (m) {
6433 M_ALIGN(m, l);
6434 m->m_len = l;
6435 m->m_next = NULL;
6436 }
6437 } else
6438 M_PREPEND(m, l, M_NOWAIT);
6439 if (!m)
6440 return NULL;
6441
6442 comb = mtod(m, struct sadb_comb *);
6443 bzero(comb, sizeof(*comb));
6444 key_getcomb_setlifetime(comb);
6445 comb->sadb_comb_auth = i;
6446 comb->sadb_comb_auth_minbits = _BITS(minkeysize);
6447 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize);
6448 }
6449
6450 return m;
6451 }
6452
6453 /*
6454 * not really an official behavior. discussed in pf_key@inner.net in Sep2000.
6455 * XXX reorder combinations by preference
6456 */
6457 static struct mbuf *
key_getcomb_ipcomp(void)6458 key_getcomb_ipcomp(void)
6459 {
6460 const struct comp_algo *algo;
6461 struct sadb_comb *comb;
6462 struct mbuf *m;
6463 int i;
6464 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
6465
6466 m = NULL;
6467 for (i = 1; i <= SADB_X_CALG_MAX; i++) {
6468 algo = comp_algorithm_lookup(i);
6469 if (!algo)
6470 continue;
6471
6472 if (!m) {
6473 IPSEC_ASSERT(l <= MLEN,
6474 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
6475 MGET(m, M_NOWAIT, MT_DATA);
6476 if (m) {
6477 M_ALIGN(m, l);
6478 m->m_len = l;
6479 m->m_next = NULL;
6480 }
6481 } else
6482 M_PREPEND(m, l, M_NOWAIT);
6483 if (!m)
6484 return NULL;
6485
6486 comb = mtod(m, struct sadb_comb *);
6487 bzero(comb, sizeof(*comb));
6488 key_getcomb_setlifetime(comb);
6489 comb->sadb_comb_encrypt = i;
6490 /* what should we set into sadb_comb_*_{min,max}bits? */
6491 }
6492
6493 return m;
6494 }
6495
6496 /*
6497 * XXX no way to pass mode (transport/tunnel) to userland
6498 * XXX replay checking?
6499 * XXX sysctl interface to ipsec_{ah,esp}_keymin
6500 */
6501 static struct mbuf *
key_getprop(const struct secasindex * saidx)6502 key_getprop(const struct secasindex *saidx)
6503 {
6504 struct sadb_prop *prop;
6505 struct mbuf *m, *n;
6506 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop));
6507 int totlen;
6508
6509 switch (saidx->proto) {
6510 case IPPROTO_ESP:
6511 m = key_getcomb_ealg();
6512 break;
6513 case IPPROTO_AH:
6514 m = key_getcomb_ah();
6515 break;
6516 case IPPROTO_IPCOMP:
6517 m = key_getcomb_ipcomp();
6518 break;
6519 default:
6520 return NULL;
6521 }
6522
6523 if (!m)
6524 return NULL;
6525 M_PREPEND(m, l, M_NOWAIT);
6526 if (!m)
6527 return NULL;
6528
6529 totlen = 0;
6530 for (n = m; n; n = n->m_next)
6531 totlen += n->m_len;
6532
6533 prop = mtod(m, struct sadb_prop *);
6534 bzero(prop, sizeof(*prop));
6535 prop->sadb_prop_len = PFKEY_UNIT64(totlen);
6536 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL;
6537 prop->sadb_prop_replay = 32; /* XXX */
6538
6539 return m;
6540 }
6541
6542 /*
6543 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2().
6544 * send
6545 * <base, SA, address(SD), (address(P)), x_policy,
6546 * (identity(SD),) (sensitivity,) proposal>
6547 * to KMD, and expect to receive
6548 * <base> with SADB_ACQUIRE if error occurred,
6549 * or
6550 * <base, src address, dst address, (SPI range)> with SADB_GETSPI
6551 * from KMD by PF_KEY.
6552 *
6553 * XXX x_policy is outside of RFC2367 (KAME extension).
6554 * XXX sensitivity is not supported.
6555 * XXX for ipcomp, RFC2367 does not define how to fill in proposal.
6556 * see comment for key_getcomb_ipcomp().
6557 *
6558 * OUT:
6559 * 0 : succeed
6560 * others: error number
6561 */
6562 static int
key_acquire(const struct secasindex * saidx,struct secpolicy * sp)6563 key_acquire(const struct secasindex *saidx, struct secpolicy *sp)
6564 {
6565 union sockaddr_union addr;
6566 struct mbuf *result, *m;
6567 uint32_t seq;
6568 int error;
6569 uint16_t ul_proto;
6570 uint8_t mask, satype;
6571
6572 IPSEC_ASSERT(saidx != NULL, ("null saidx"));
6573 satype = key_proto2satype(saidx->proto);
6574 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto));
6575
6576 error = -1;
6577 result = NULL;
6578 ul_proto = IPSEC_ULPROTO_ANY;
6579
6580 /* Get seq number to check whether sending message or not. */
6581 seq = key_getacq(saidx, &error);
6582 if (seq == 0)
6583 return (error);
6584
6585 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0);
6586 if (!m) {
6587 error = ENOBUFS;
6588 goto fail;
6589 }
6590 result = m;
6591
6592 /*
6593 * set sadb_address for saidx's.
6594 *
6595 * Note that if sp is supplied, then we're being called from
6596 * key_allocsa_policy() and should supply port and protocol
6597 * information.
6598 * XXXAE: why only TCP and UDP? ICMP and SCTP looks applicable too.
6599 * XXXAE: probably we can handle this in the ipsec[46]_allocsa().
6600 * XXXAE: it looks like we should save this info in the ACQ entry.
6601 */
6602 if (sp != NULL && (sp->spidx.ul_proto == IPPROTO_TCP ||
6603 sp->spidx.ul_proto == IPPROTO_UDP))
6604 ul_proto = sp->spidx.ul_proto;
6605
6606 addr = saidx->src;
6607 mask = FULLMASK;
6608 if (ul_proto != IPSEC_ULPROTO_ANY) {
6609 switch (sp->spidx.src.sa.sa_family) {
6610 case AF_INET:
6611 if (sp->spidx.src.sin.sin_port != IPSEC_PORT_ANY) {
6612 addr.sin.sin_port = sp->spidx.src.sin.sin_port;
6613 mask = sp->spidx.prefs;
6614 }
6615 break;
6616 case AF_INET6:
6617 if (sp->spidx.src.sin6.sin6_port != IPSEC_PORT_ANY) {
6618 addr.sin6.sin6_port =
6619 sp->spidx.src.sin6.sin6_port;
6620 mask = sp->spidx.prefs;
6621 }
6622 break;
6623 default:
6624 break;
6625 }
6626 }
6627 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &addr.sa, mask, ul_proto);
6628 if (!m) {
6629 error = ENOBUFS;
6630 goto fail;
6631 }
6632 m_cat(result, m);
6633
6634 addr = saidx->dst;
6635 mask = FULLMASK;
6636 if (ul_proto != IPSEC_ULPROTO_ANY) {
6637 switch (sp->spidx.dst.sa.sa_family) {
6638 case AF_INET:
6639 if (sp->spidx.dst.sin.sin_port != IPSEC_PORT_ANY) {
6640 addr.sin.sin_port = sp->spidx.dst.sin.sin_port;
6641 mask = sp->spidx.prefd;
6642 }
6643 break;
6644 case AF_INET6:
6645 if (sp->spidx.dst.sin6.sin6_port != IPSEC_PORT_ANY) {
6646 addr.sin6.sin6_port =
6647 sp->spidx.dst.sin6.sin6_port;
6648 mask = sp->spidx.prefd;
6649 }
6650 break;
6651 default:
6652 break;
6653 }
6654 }
6655 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &addr.sa, mask, ul_proto);
6656 if (!m) {
6657 error = ENOBUFS;
6658 goto fail;
6659 }
6660 m_cat(result, m);
6661
6662 /* XXX proxy address (optional) */
6663
6664 /*
6665 * Set sadb_x_policy. This is KAME extension to RFC2367.
6666 */
6667 if (sp != NULL) {
6668 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id,
6669 sp->priority);
6670 if (!m) {
6671 error = ENOBUFS;
6672 goto fail;
6673 }
6674 m_cat(result, m);
6675 }
6676
6677 /*
6678 * Set sadb_x_sa2 extension if saidx->reqid is not zero.
6679 * This is FreeBSD extension to RFC2367.
6680 */
6681 if (saidx->reqid != 0) {
6682 m = key_setsadbxsa2(saidx->mode, 0, saidx->reqid);
6683 if (m == NULL) {
6684 error = ENOBUFS;
6685 goto fail;
6686 }
6687 m_cat(result, m);
6688 }
6689 /* XXX identity (optional) */
6690 #if 0
6691 if (idexttype && fqdn) {
6692 /* create identity extension (FQDN) */
6693 struct sadb_ident *id;
6694 int fqdnlen;
6695
6696 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */
6697 id = (struct sadb_ident *)p;
6698 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
6699 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
6700 id->sadb_ident_exttype = idexttype;
6701 id->sadb_ident_type = SADB_IDENTTYPE_FQDN;
6702 bcopy(fqdn, id + 1, fqdnlen);
6703 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen);
6704 }
6705
6706 if (idexttype) {
6707 /* create identity extension (USERFQDN) */
6708 struct sadb_ident *id;
6709 int userfqdnlen;
6710
6711 if (userfqdn) {
6712 /* +1 for terminating-NUL */
6713 userfqdnlen = strlen(userfqdn) + 1;
6714 } else
6715 userfqdnlen = 0;
6716 id = (struct sadb_ident *)p;
6717 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
6718 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
6719 id->sadb_ident_exttype = idexttype;
6720 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN;
6721 /* XXX is it correct? */
6722 if (curproc && curproc->p_cred)
6723 id->sadb_ident_id = curproc->p_cred->p_ruid;
6724 if (userfqdn && userfqdnlen)
6725 bcopy(userfqdn, id + 1, userfqdnlen);
6726 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen);
6727 }
6728 #endif
6729
6730 /* XXX sensitivity (optional) */
6731
6732 /* create proposal/combination extension */
6733 m = key_getprop(saidx);
6734 #if 0
6735 /*
6736 * spec conformant: always attach proposal/combination extension,
6737 * the problem is that we have no way to attach it for ipcomp,
6738 * due to the way sadb_comb is declared in RFC2367.
6739 */
6740 if (!m) {
6741 error = ENOBUFS;
6742 goto fail;
6743 }
6744 m_cat(result, m);
6745 #else
6746 /*
6747 * outside of spec; make proposal/combination extension optional.
6748 */
6749 if (m)
6750 m_cat(result, m);
6751 #endif
6752
6753 if ((result->m_flags & M_PKTHDR) == 0) {
6754 error = EINVAL;
6755 goto fail;
6756 }
6757
6758 if (result->m_len < sizeof(struct sadb_msg)) {
6759 result = m_pullup(result, sizeof(struct sadb_msg));
6760 if (result == NULL) {
6761 error = ENOBUFS;
6762 goto fail;
6763 }
6764 }
6765
6766 result->m_pkthdr.len = 0;
6767 for (m = result; m; m = m->m_next)
6768 result->m_pkthdr.len += m->m_len;
6769
6770 mtod(result, struct sadb_msg *)->sadb_msg_len =
6771 PFKEY_UNIT64(result->m_pkthdr.len);
6772
6773 KEYDBG(KEY_STAMP,
6774 printf("%s: SP(%p)\n", __func__, sp));
6775 KEYDBG(KEY_DATA, kdebug_secasindex(saidx, NULL));
6776
6777 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
6778
6779 fail:
6780 if (result)
6781 m_freem(result);
6782 return error;
6783 }
6784
6785 static uint32_t
key_newacq(const struct secasindex * saidx,int * perror)6786 key_newacq(const struct secasindex *saidx, int *perror)
6787 {
6788 struct secacq *acq;
6789 uint32_t seq;
6790
6791 acq = malloc(sizeof(*acq), M_IPSEC_SAQ, M_NOWAIT | M_ZERO);
6792 if (acq == NULL) {
6793 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
6794 *perror = ENOBUFS;
6795 return (0);
6796 }
6797
6798 /* copy secindex */
6799 bcopy(saidx, &acq->saidx, sizeof(acq->saidx));
6800 acq->created = time_second;
6801 acq->count = 0;
6802
6803 /* add to acqtree */
6804 ACQ_LOCK();
6805 seq = acq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq);
6806 LIST_INSERT_HEAD(&V_acqtree, acq, chain);
6807 LIST_INSERT_HEAD(ACQADDRHASH_HASH(saidx), acq, addrhash);
6808 LIST_INSERT_HEAD(ACQSEQHASH_HASH(seq), acq, seqhash);
6809 ACQ_UNLOCK();
6810 *perror = 0;
6811 return (seq);
6812 }
6813
6814 static uint32_t
key_getacq(const struct secasindex * saidx,int * perror)6815 key_getacq(const struct secasindex *saidx, int *perror)
6816 {
6817 struct secacq *acq;
6818 uint32_t seq;
6819
6820 ACQ_LOCK();
6821 LIST_FOREACH(acq, ACQADDRHASH_HASH(saidx), addrhash) {
6822 if (key_cmpsaidx(&acq->saidx, saidx, CMP_EXACTLY)) {
6823 if (acq->count > V_key_blockacq_count) {
6824 /*
6825 * Reset counter and send message.
6826 * Also reset created time to keep ACQ for
6827 * this saidx.
6828 */
6829 acq->created = time_second;
6830 acq->count = 0;
6831 seq = acq->seq;
6832 } else {
6833 /*
6834 * Increment counter and do nothing.
6835 * We send SADB_ACQUIRE message only
6836 * for each V_key_blockacq_count packet.
6837 */
6838 acq->count++;
6839 seq = 0;
6840 }
6841 break;
6842 }
6843 }
6844 ACQ_UNLOCK();
6845 if (acq != NULL) {
6846 *perror = 0;
6847 return (seq);
6848 }
6849 /* allocate new entry */
6850 return (key_newacq(saidx, perror));
6851 }
6852
6853 static int
key_acqreset(uint32_t seq)6854 key_acqreset(uint32_t seq)
6855 {
6856 struct secacq *acq;
6857
6858 ACQ_LOCK();
6859 LIST_FOREACH(acq, ACQSEQHASH_HASH(seq), seqhash) {
6860 if (acq->seq == seq) {
6861 acq->count = 0;
6862 acq->created = time_second;
6863 break;
6864 }
6865 }
6866 ACQ_UNLOCK();
6867 if (acq == NULL)
6868 return (ESRCH);
6869 return (0);
6870 }
6871 /*
6872 * Mark ACQ entry as stale to remove it in key_flush_acq().
6873 * Called after successful SADB_GETSPI message.
6874 */
6875 static int
key_acqdone(const struct secasindex * saidx,uint32_t seq)6876 key_acqdone(const struct secasindex *saidx, uint32_t seq)
6877 {
6878 struct secacq *acq;
6879
6880 ACQ_LOCK();
6881 LIST_FOREACH(acq, ACQSEQHASH_HASH(seq), seqhash) {
6882 if (acq->seq == seq)
6883 break;
6884 }
6885 if (acq != NULL) {
6886 if (key_cmpsaidx(&acq->saidx, saidx, CMP_EXACTLY) == 0) {
6887 ipseclog((LOG_DEBUG,
6888 "%s: Mismatched saidx for ACQ %u\n", __func__, seq));
6889 acq = NULL;
6890 } else {
6891 acq->created = 0;
6892 }
6893 } else {
6894 ipseclog((LOG_DEBUG,
6895 "%s: ACQ %u is not found.\n", __func__, seq));
6896 }
6897 ACQ_UNLOCK();
6898 if (acq == NULL)
6899 return (ESRCH);
6900 return (0);
6901 }
6902
6903 static struct secspacq *
key_newspacq(struct secpolicyindex * spidx)6904 key_newspacq(struct secpolicyindex *spidx)
6905 {
6906 struct secspacq *acq;
6907
6908 /* get new entry */
6909 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO);
6910 if (acq == NULL) {
6911 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
6912 return NULL;
6913 }
6914
6915 /* copy secindex */
6916 bcopy(spidx, &acq->spidx, sizeof(acq->spidx));
6917 acq->created = time_second;
6918 acq->count = 0;
6919
6920 /* add to spacqtree */
6921 SPACQ_LOCK();
6922 LIST_INSERT_HEAD(&V_spacqtree, acq, chain);
6923 SPACQ_UNLOCK();
6924
6925 return acq;
6926 }
6927
6928 static struct secspacq *
key_getspacq(struct secpolicyindex * spidx)6929 key_getspacq(struct secpolicyindex *spidx)
6930 {
6931 struct secspacq *acq;
6932
6933 SPACQ_LOCK();
6934 LIST_FOREACH(acq, &V_spacqtree, chain) {
6935 if (key_cmpspidx_exactly(spidx, &acq->spidx)) {
6936 /* NB: return holding spacq_lock */
6937 return acq;
6938 }
6939 }
6940 SPACQ_UNLOCK();
6941
6942 return NULL;
6943 }
6944
6945 /*
6946 * SADB_ACQUIRE processing,
6947 * in first situation, is receiving
6948 * <base>
6949 * from the ikmpd, and clear sequence of its secasvar entry.
6950 *
6951 * In second situation, is receiving
6952 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
6953 * from a user land process, and return
6954 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
6955 * to the socket.
6956 *
6957 * m will always be freed.
6958 */
6959 static int
key_acquire2(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)6960 key_acquire2(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6961 {
6962 SAHTREE_RLOCK_TRACKER;
6963 struct sadb_address *src0, *dst0;
6964 struct secasindex saidx;
6965 struct secashead *sah;
6966 uint32_t reqid;
6967 int error;
6968 uint8_t mode, proto;
6969
6970 IPSEC_ASSERT(so != NULL, ("null socket"));
6971 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6972 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6973 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6974
6975 /*
6976 * Error message from KMd.
6977 * We assume that if error was occurred in IKEd, the length of PFKEY
6978 * message is equal to the size of sadb_msg structure.
6979 * We do not raise error even if error occurred in this function.
6980 */
6981 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) {
6982 /* check sequence number */
6983 if (mhp->msg->sadb_msg_seq == 0 ||
6984 mhp->msg->sadb_msg_errno == 0) {
6985 ipseclog((LOG_DEBUG, "%s: must specify sequence "
6986 "number and errno.\n", __func__));
6987 } else {
6988 /*
6989 * IKEd reported that error occurred.
6990 * XXXAE: what it expects from the kernel?
6991 * Probably we should send SADB_ACQUIRE again?
6992 * If so, reset ACQ's state.
6993 * XXXAE: it looks useless.
6994 */
6995 key_acqreset(mhp->msg->sadb_msg_seq);
6996 }
6997 m_freem(m);
6998 return (0);
6999 }
7000
7001 /*
7002 * This message is from user land.
7003 */
7004
7005 /* map satype to proto */
7006 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7007 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7008 __func__));
7009 return key_senderror(so, m, EINVAL);
7010 }
7011
7012 if (SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_SRC) ||
7013 SADB_CHECKHDR(mhp, SADB_EXT_ADDRESS_DST) ||
7014 SADB_CHECKHDR(mhp, SADB_EXT_PROPOSAL)) {
7015 ipseclog((LOG_DEBUG,
7016 "%s: invalid message: missing required header.\n",
7017 __func__));
7018 return key_senderror(so, m, EINVAL);
7019 }
7020 if (SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_SRC) ||
7021 SADB_CHECKLEN(mhp, SADB_EXT_ADDRESS_DST) ||
7022 SADB_CHECKLEN(mhp, SADB_EXT_PROPOSAL)) {
7023 ipseclog((LOG_DEBUG,
7024 "%s: invalid message: wrong header size.\n", __func__));
7025 return key_senderror(so, m, EINVAL);
7026 }
7027
7028 if (SADB_CHECKHDR(mhp, SADB_X_EXT_SA2)) {
7029 mode = IPSEC_MODE_ANY;
7030 reqid = 0;
7031 } else {
7032 if (SADB_CHECKLEN(mhp, SADB_X_EXT_SA2)) {
7033 ipseclog((LOG_DEBUG,
7034 "%s: invalid message: wrong header size.\n",
7035 __func__));
7036 return key_senderror(so, m, EINVAL);
7037 }
7038 mode = ((struct sadb_x_sa2 *)
7039 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
7040 reqid = ((struct sadb_x_sa2 *)
7041 mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
7042 }
7043
7044 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
7045 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
7046
7047 error = key_checksockaddrs((struct sockaddr *)(src0 + 1),
7048 (struct sockaddr *)(dst0 + 1));
7049 if (error != 0) {
7050 ipseclog((LOG_DEBUG, "%s: invalid sockaddr.\n", __func__));
7051 return key_senderror(so, m, EINVAL);
7052 }
7053 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
7054
7055 /* get a SA index */
7056 SAHTREE_RLOCK();
7057 LIST_FOREACH(sah, SAHADDRHASH_HASH(&saidx), addrhash) {
7058 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID))
7059 break;
7060 }
7061 SAHTREE_RUNLOCK();
7062 if (sah != NULL) {
7063 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__));
7064 return key_senderror(so, m, EEXIST);
7065 }
7066
7067 error = key_acquire(&saidx, NULL);
7068 if (error != 0) {
7069 ipseclog((LOG_DEBUG,
7070 "%s: error %d returned from key_acquire()\n",
7071 __func__, error));
7072 return key_senderror(so, m, error);
7073 }
7074 m_freem(m);
7075 return (0);
7076 }
7077
7078 /*
7079 * SADB_REGISTER processing.
7080 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported.
7081 * receive
7082 * <base>
7083 * from the ikmpd, and register a socket to send PF_KEY messages,
7084 * and send
7085 * <base, supported>
7086 * to KMD by PF_KEY.
7087 * If socket is detached, must free from regnode.
7088 *
7089 * m will always be freed.
7090 */
7091 static int
key_register(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7092 key_register(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7093 {
7094 struct secreg *reg, *newreg = NULL;
7095
7096 IPSEC_ASSERT(so != NULL, ("null socket"));
7097 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7098 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7099 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7100
7101 /* check for invalid register message */
7102 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0]))
7103 return key_senderror(so, m, EINVAL);
7104
7105 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */
7106 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC)
7107 goto setmsg;
7108
7109 /* check whether existing or not */
7110 REGTREE_LOCK();
7111 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) {
7112 if (reg->so == so) {
7113 REGTREE_UNLOCK();
7114 ipseclog((LOG_DEBUG, "%s: socket exists already.\n",
7115 __func__));
7116 return key_senderror(so, m, EEXIST);
7117 }
7118 }
7119
7120 /* create regnode */
7121 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO);
7122 if (newreg == NULL) {
7123 REGTREE_UNLOCK();
7124 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
7125 return key_senderror(so, m, ENOBUFS);
7126 }
7127
7128 newreg->so = so;
7129 ((struct keycb *)sotorawcb(so))->kp_registered++;
7130
7131 /* add regnode to regtree. */
7132 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain);
7133 REGTREE_UNLOCK();
7134
7135 setmsg:
7136 {
7137 struct mbuf *n;
7138 struct sadb_msg *newmsg;
7139 struct sadb_supported *sup;
7140 u_int len, alen, elen;
7141 int off;
7142 int i;
7143 struct sadb_alg *alg;
7144
7145 /* create new sadb_msg to reply. */
7146 alen = 0;
7147 for (i = 1; i <= SADB_AALG_MAX; i++) {
7148 if (auth_algorithm_lookup(i))
7149 alen += sizeof(struct sadb_alg);
7150 }
7151 if (alen)
7152 alen += sizeof(struct sadb_supported);
7153 elen = 0;
7154 for (i = 1; i <= SADB_EALG_MAX; i++) {
7155 if (enc_algorithm_lookup(i))
7156 elen += sizeof(struct sadb_alg);
7157 }
7158 if (elen)
7159 elen += sizeof(struct sadb_supported);
7160
7161 len = sizeof(struct sadb_msg) + alen + elen;
7162
7163 if (len > MCLBYTES)
7164 return key_senderror(so, m, ENOBUFS);
7165
7166 MGETHDR(n, M_NOWAIT, MT_DATA);
7167 if (len > MHLEN) {
7168 if (!(MCLGET(n, M_NOWAIT))) {
7169 m_freem(n);
7170 n = NULL;
7171 }
7172 }
7173 if (!n)
7174 return key_senderror(so, m, ENOBUFS);
7175
7176 n->m_pkthdr.len = n->m_len = len;
7177 n->m_next = NULL;
7178 off = 0;
7179
7180 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
7181 newmsg = mtod(n, struct sadb_msg *);
7182 newmsg->sadb_msg_errno = 0;
7183 newmsg->sadb_msg_len = PFKEY_UNIT64(len);
7184 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
7185
7186 /* for authentication algorithm */
7187 if (alen) {
7188 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
7189 sup->sadb_supported_len = PFKEY_UNIT64(alen);
7190 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
7191 off += PFKEY_ALIGN8(sizeof(*sup));
7192
7193 for (i = 1; i <= SADB_AALG_MAX; i++) {
7194 const struct auth_hash *aalgo;
7195 u_int16_t minkeysize, maxkeysize;
7196
7197 aalgo = auth_algorithm_lookup(i);
7198 if (!aalgo)
7199 continue;
7200 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
7201 alg->sadb_alg_id = i;
7202 alg->sadb_alg_ivlen = 0;
7203 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize);
7204 alg->sadb_alg_minbits = _BITS(minkeysize);
7205 alg->sadb_alg_maxbits = _BITS(maxkeysize);
7206 off += PFKEY_ALIGN8(sizeof(*alg));
7207 }
7208 }
7209
7210 /* for encryption algorithm */
7211 if (elen) {
7212 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
7213 sup->sadb_supported_len = PFKEY_UNIT64(elen);
7214 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
7215 off += PFKEY_ALIGN8(sizeof(*sup));
7216
7217 for (i = 1; i <= SADB_EALG_MAX; i++) {
7218 const struct enc_xform *ealgo;
7219
7220 ealgo = enc_algorithm_lookup(i);
7221 if (!ealgo)
7222 continue;
7223 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
7224 alg->sadb_alg_id = i;
7225 alg->sadb_alg_ivlen = ealgo->ivsize;
7226 alg->sadb_alg_minbits = _BITS(ealgo->minkey);
7227 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey);
7228 off += PFKEY_ALIGN8(sizeof(struct sadb_alg));
7229 }
7230 }
7231
7232 IPSEC_ASSERT(off == len,
7233 ("length assumption failed (off %u len %u)", off, len));
7234
7235 m_freem(m);
7236 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED);
7237 }
7238 }
7239
7240 /*
7241 * free secreg entry registered.
7242 * XXX: I want to do free a socket marked done SADB_RESIGER to socket.
7243 */
7244 void
key_freereg(struct socket * so)7245 key_freereg(struct socket *so)
7246 {
7247 struct secreg *reg;
7248 int i;
7249
7250 IPSEC_ASSERT(so != NULL, ("NULL so"));
7251
7252 /*
7253 * check whether existing or not.
7254 * check all type of SA, because there is a potential that
7255 * one socket is registered to multiple type of SA.
7256 */
7257 REGTREE_LOCK();
7258 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
7259 LIST_FOREACH(reg, &V_regtree[i], chain) {
7260 if (reg->so == so && __LIST_CHAINED(reg)) {
7261 LIST_REMOVE(reg, chain);
7262 free(reg, M_IPSEC_SAR);
7263 break;
7264 }
7265 }
7266 }
7267 REGTREE_UNLOCK();
7268 }
7269
7270 /*
7271 * SADB_EXPIRE processing
7272 * send
7273 * <base, SA, SA2, lifetime(C and one of HS), address(SD)>
7274 * to KMD by PF_KEY.
7275 * NOTE: We send only soft lifetime extension.
7276 *
7277 * OUT: 0 : succeed
7278 * others : error number
7279 */
7280 static int
key_expire(struct secasvar * sav,int hard)7281 key_expire(struct secasvar *sav, int hard)
7282 {
7283 struct mbuf *result = NULL, *m;
7284 struct sadb_lifetime *lt;
7285 uint32_t replay_count;
7286 int error, len;
7287 uint8_t satype;
7288
7289 IPSEC_ASSERT (sav != NULL, ("null sav"));
7290 IPSEC_ASSERT (sav->sah != NULL, ("null sa header"));
7291
7292 KEYDBG(KEY_STAMP,
7293 printf("%s: SA(%p) expired %s lifetime\n", __func__,
7294 sav, hard ? "hard": "soft"));
7295 KEYDBG(KEY_DATA, kdebug_secasv(sav));
7296 /* set msg header */
7297 satype = key_proto2satype(sav->sah->saidx.proto);
7298 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype));
7299 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt);
7300 if (!m) {
7301 error = ENOBUFS;
7302 goto fail;
7303 }
7304 result = m;
7305
7306 /* create SA extension */
7307 m = key_setsadbsa(sav);
7308 if (!m) {
7309 error = ENOBUFS;
7310 goto fail;
7311 }
7312 m_cat(result, m);
7313
7314 /* create SA extension */
7315 SECASVAR_LOCK(sav);
7316 replay_count = sav->replay ? sav->replay->count : 0;
7317 SECASVAR_UNLOCK(sav);
7318
7319 m = key_setsadbxsa2(sav->sah->saidx.mode, replay_count,
7320 sav->sah->saidx.reqid);
7321 if (!m) {
7322 error = ENOBUFS;
7323 goto fail;
7324 }
7325 m_cat(result, m);
7326
7327 if (sav->replay && sav->replay->wsize > UINT8_MAX) {
7328 m = key_setsadbxsareplay(sav->replay->wsize);
7329 if (!m) {
7330 error = ENOBUFS;
7331 goto fail;
7332 }
7333 m_cat(result, m);
7334 }
7335
7336 /* create lifetime extension (current and soft) */
7337 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
7338 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
7339 if (m == NULL) {
7340 error = ENOBUFS;
7341 goto fail;
7342 }
7343 m_align(m, len);
7344 m->m_len = len;
7345 bzero(mtod(m, caddr_t), len);
7346 lt = mtod(m, struct sadb_lifetime *);
7347 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
7348 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
7349 lt->sadb_lifetime_allocations =
7350 (uint32_t)counter_u64_fetch(sav->lft_c_allocations);
7351 lt->sadb_lifetime_bytes =
7352 counter_u64_fetch(sav->lft_c_bytes);
7353 lt->sadb_lifetime_addtime = sav->created;
7354 lt->sadb_lifetime_usetime = sav->firstused;
7355 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
7356 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
7357 if (hard) {
7358 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
7359 lt->sadb_lifetime_allocations = sav->lft_h->allocations;
7360 lt->sadb_lifetime_bytes = sav->lft_h->bytes;
7361 lt->sadb_lifetime_addtime = sav->lft_h->addtime;
7362 lt->sadb_lifetime_usetime = sav->lft_h->usetime;
7363 } else {
7364 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
7365 lt->sadb_lifetime_allocations = sav->lft_s->allocations;
7366 lt->sadb_lifetime_bytes = sav->lft_s->bytes;
7367 lt->sadb_lifetime_addtime = sav->lft_s->addtime;
7368 lt->sadb_lifetime_usetime = sav->lft_s->usetime;
7369 }
7370 m_cat(result, m);
7371
7372 /* set sadb_address for source */
7373 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
7374 &sav->sah->saidx.src.sa,
7375 FULLMASK, IPSEC_ULPROTO_ANY);
7376 if (!m) {
7377 error = ENOBUFS;
7378 goto fail;
7379 }
7380 m_cat(result, m);
7381
7382 /* set sadb_address for destination */
7383 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
7384 &sav->sah->saidx.dst.sa,
7385 FULLMASK, IPSEC_ULPROTO_ANY);
7386 if (!m) {
7387 error = ENOBUFS;
7388 goto fail;
7389 }
7390 m_cat(result, m);
7391
7392 /*
7393 * XXX-BZ Handle NAT-T extensions here.
7394 * XXXAE: it doesn't seem quite useful. IKEs should not depend on
7395 * this information, we report only significant SA fields.
7396 */
7397
7398 if ((result->m_flags & M_PKTHDR) == 0) {
7399 error = EINVAL;
7400 goto fail;
7401 }
7402
7403 if (result->m_len < sizeof(struct sadb_msg)) {
7404 result = m_pullup(result, sizeof(struct sadb_msg));
7405 if (result == NULL) {
7406 error = ENOBUFS;
7407 goto fail;
7408 }
7409 }
7410
7411 result->m_pkthdr.len = 0;
7412 for (m = result; m; m = m->m_next)
7413 result->m_pkthdr.len += m->m_len;
7414
7415 mtod(result, struct sadb_msg *)->sadb_msg_len =
7416 PFKEY_UNIT64(result->m_pkthdr.len);
7417
7418 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
7419
7420 fail:
7421 if (result)
7422 m_freem(result);
7423 return error;
7424 }
7425
7426 static void
key_freesah_flushed(struct secashead_queue * flushq)7427 key_freesah_flushed(struct secashead_queue *flushq)
7428 {
7429 struct secashead *sah, *nextsah;
7430 struct secasvar *sav, *nextsav;
7431
7432 sah = TAILQ_FIRST(flushq);
7433 while (sah != NULL) {
7434 sav = TAILQ_FIRST(&sah->savtree_larval);
7435 while (sav != NULL) {
7436 nextsav = TAILQ_NEXT(sav, chain);
7437 TAILQ_REMOVE(&sah->savtree_larval, sav, chain);
7438 key_freesav(&sav); /* release last reference */
7439 key_freesah(&sah); /* release reference from SAV */
7440 sav = nextsav;
7441 }
7442 sav = TAILQ_FIRST(&sah->savtree_alive);
7443 while (sav != NULL) {
7444 nextsav = TAILQ_NEXT(sav, chain);
7445 TAILQ_REMOVE(&sah->savtree_alive, sav, chain);
7446 key_freesav(&sav); /* release last reference */
7447 key_freesah(&sah); /* release reference from SAV */
7448 sav = nextsav;
7449 }
7450 nextsah = TAILQ_NEXT(sah, chain);
7451 key_freesah(&sah); /* release last reference */
7452 sah = nextsah;
7453 }
7454 }
7455
7456 /*
7457 * SADB_FLUSH processing
7458 * receive
7459 * <base>
7460 * from the ikmpd, and free all entries in secastree.
7461 * and send,
7462 * <base>
7463 * to the ikmpd.
7464 * NOTE: to do is only marking SADB_SASTATE_DEAD.
7465 *
7466 * m will always be freed.
7467 */
7468 static int
key_flush(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7469 key_flush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7470 {
7471 struct secashead_queue flushq;
7472 struct sadb_msg *newmsg;
7473 struct secashead *sah, *nextsah;
7474 struct secasvar *sav;
7475 uint8_t proto;
7476 int i;
7477
7478 IPSEC_ASSERT(so != NULL, ("null socket"));
7479 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7480 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7481
7482 /* map satype to proto */
7483 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7484 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7485 __func__));
7486 return key_senderror(so, m, EINVAL);
7487 }
7488 KEYDBG(KEY_STAMP,
7489 printf("%s: proto %u\n", __func__, proto));
7490
7491 TAILQ_INIT(&flushq);
7492 if (proto == IPSEC_PROTO_ANY) {
7493 /* no SATYPE specified, i.e. flushing all SA. */
7494 SAHTREE_WLOCK();
7495 /* Move all SAHs into flushq */
7496 TAILQ_CONCAT(&flushq, &V_sahtree, chain);
7497 /* Flush all buckets in SPI hash */
7498 for (i = 0; i < V_savhash_mask + 1; i++)
7499 LIST_INIT(&V_savhashtbl[i]);
7500 /* Flush all buckets in SAHADDRHASH */
7501 for (i = 0; i < V_sahaddrhash_mask + 1; i++)
7502 LIST_INIT(&V_sahaddrhashtbl[i]);
7503 /* Mark all SAHs as unlinked */
7504 TAILQ_FOREACH(sah, &flushq, chain) {
7505 sah->state = SADB_SASTATE_DEAD;
7506 /*
7507 * Callout handler makes its job using
7508 * RLOCK and drain queues. In case, when this
7509 * function will be called just before it
7510 * acquires WLOCK, we need to mark SAs as
7511 * unlinked to prevent second unlink.
7512 */
7513 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7514 sav->state = SADB_SASTATE_DEAD;
7515 }
7516 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7517 sav->state = SADB_SASTATE_DEAD;
7518 }
7519 }
7520 SAHTREE_WUNLOCK();
7521 } else {
7522 SAHTREE_WLOCK();
7523 sah = TAILQ_FIRST(&V_sahtree);
7524 while (sah != NULL) {
7525 IPSEC_ASSERT(sah->state != SADB_SASTATE_DEAD,
7526 ("DEAD SAH %p in SADB_FLUSH", sah));
7527 nextsah = TAILQ_NEXT(sah, chain);
7528 if (sah->saidx.proto != proto) {
7529 sah = nextsah;
7530 continue;
7531 }
7532 sah->state = SADB_SASTATE_DEAD;
7533 TAILQ_REMOVE(&V_sahtree, sah, chain);
7534 LIST_REMOVE(sah, addrhash);
7535 /* Unlink all SAs from SPI hash */
7536 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7537 LIST_REMOVE(sav, spihash);
7538 sav->state = SADB_SASTATE_DEAD;
7539 }
7540 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7541 LIST_REMOVE(sav, spihash);
7542 sav->state = SADB_SASTATE_DEAD;
7543 }
7544 /* Add SAH into flushq */
7545 TAILQ_INSERT_HEAD(&flushq, sah, chain);
7546 sah = nextsah;
7547 }
7548 SAHTREE_WUNLOCK();
7549 }
7550
7551 key_freesah_flushed(&flushq);
7552 /* Free all queued SAs and SAHs */
7553 if (m->m_len < sizeof(struct sadb_msg) ||
7554 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
7555 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
7556 return key_senderror(so, m, ENOBUFS);
7557 }
7558
7559 if (m->m_next)
7560 m_freem(m->m_next);
7561 m->m_next = NULL;
7562 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg);
7563 newmsg = mtod(m, struct sadb_msg *);
7564 newmsg->sadb_msg_errno = 0;
7565 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
7566
7567 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7568 }
7569
7570 /*
7571 * SADB_DUMP processing
7572 * dump all entries including status of DEAD in SAD.
7573 * receive
7574 * <base>
7575 * from the ikmpd, and dump all secasvar leaves
7576 * and send,
7577 * <base> .....
7578 * to the ikmpd.
7579 *
7580 * m will always be freed.
7581 */
7582 static int
key_dump(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7583 key_dump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7584 {
7585 SAHTREE_RLOCK_TRACKER;
7586 struct secashead *sah;
7587 struct secasvar *sav;
7588 struct mbuf *n;
7589 uint32_t cnt;
7590 uint8_t proto, satype;
7591
7592 IPSEC_ASSERT(so != NULL, ("null socket"));
7593 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7594 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7595 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7596
7597 /* map satype to proto */
7598 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
7599 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
7600 __func__));
7601 return key_senderror(so, m, EINVAL);
7602 }
7603
7604 /* count sav entries to be sent to the userland. */
7605 cnt = 0;
7606 SAHTREE_RLOCK();
7607 TAILQ_FOREACH(sah, &V_sahtree, chain) {
7608 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
7609 proto != sah->saidx.proto)
7610 continue;
7611
7612 TAILQ_FOREACH(sav, &sah->savtree_larval, chain)
7613 cnt++;
7614 TAILQ_FOREACH(sav, &sah->savtree_alive, chain)
7615 cnt++;
7616 }
7617
7618 if (cnt == 0) {
7619 SAHTREE_RUNLOCK();
7620 return key_senderror(so, m, ENOENT);
7621 }
7622
7623 /* send this to the userland, one at a time. */
7624 TAILQ_FOREACH(sah, &V_sahtree, chain) {
7625 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
7626 proto != sah->saidx.proto)
7627 continue;
7628
7629 /* map proto to satype */
7630 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
7631 SAHTREE_RUNLOCK();
7632 ipseclog((LOG_DEBUG, "%s: there was invalid proto in "
7633 "SAD.\n", __func__));
7634 return key_senderror(so, m, EINVAL);
7635 }
7636 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
7637 n = key_setdumpsa(sav, SADB_DUMP, satype,
7638 --cnt, mhp->msg->sadb_msg_pid);
7639 if (n == NULL) {
7640 SAHTREE_RUNLOCK();
7641 return key_senderror(so, m, ENOBUFS);
7642 }
7643 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
7644 }
7645 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
7646 n = key_setdumpsa(sav, SADB_DUMP, satype,
7647 --cnt, mhp->msg->sadb_msg_pid);
7648 if (n == NULL) {
7649 SAHTREE_RUNLOCK();
7650 return key_senderror(so, m, ENOBUFS);
7651 }
7652 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
7653 }
7654 }
7655 SAHTREE_RUNLOCK();
7656 m_freem(m);
7657 return (0);
7658 }
7659 /*
7660 * SADB_X_PROMISC processing
7661 *
7662 * m will always be freed.
7663 */
7664 static int
key_promisc(struct socket * so,struct mbuf * m,const struct sadb_msghdr * mhp)7665 key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
7666 {
7667 int olen;
7668
7669 IPSEC_ASSERT(so != NULL, ("null socket"));
7670 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7671 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
7672 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
7673
7674 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
7675
7676 if (olen < sizeof(struct sadb_msg)) {
7677 #if 1
7678 return key_senderror(so, m, EINVAL);
7679 #else
7680 m_freem(m);
7681 return 0;
7682 #endif
7683 } else if (olen == sizeof(struct sadb_msg)) {
7684 /* enable/disable promisc mode */
7685 struct keycb *kp;
7686
7687 if ((kp = (struct keycb *)sotorawcb(so)) == NULL)
7688 return key_senderror(so, m, EINVAL);
7689 mhp->msg->sadb_msg_errno = 0;
7690 switch (mhp->msg->sadb_msg_satype) {
7691 case 0:
7692 case 1:
7693 kp->kp_promisc = mhp->msg->sadb_msg_satype;
7694 break;
7695 default:
7696 return key_senderror(so, m, EINVAL);
7697 }
7698
7699 /* send the original message back to everyone */
7700 mhp->msg->sadb_msg_errno = 0;
7701 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7702 } else {
7703 /* send packet as is */
7704
7705 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg)));
7706
7707 /* TODO: if sadb_msg_seq is specified, send to specific pid */
7708 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
7709 }
7710 }
7711
7712 static int (*key_typesw[])(struct socket *, struct mbuf *,
7713 const struct sadb_msghdr *) = {
7714 NULL, /* SADB_RESERVED */
7715 key_getspi, /* SADB_GETSPI */
7716 key_update, /* SADB_UPDATE */
7717 key_add, /* SADB_ADD */
7718 key_delete, /* SADB_DELETE */
7719 key_get, /* SADB_GET */
7720 key_acquire2, /* SADB_ACQUIRE */
7721 key_register, /* SADB_REGISTER */
7722 NULL, /* SADB_EXPIRE */
7723 key_flush, /* SADB_FLUSH */
7724 key_dump, /* SADB_DUMP */
7725 key_promisc, /* SADB_X_PROMISC */
7726 NULL, /* SADB_X_PCHANGE */
7727 key_spdadd, /* SADB_X_SPDUPDATE */
7728 key_spdadd, /* SADB_X_SPDADD */
7729 key_spddelete, /* SADB_X_SPDDELETE */
7730 key_spdget, /* SADB_X_SPDGET */
7731 NULL, /* SADB_X_SPDACQUIRE */
7732 key_spddump, /* SADB_X_SPDDUMP */
7733 key_spdflush, /* SADB_X_SPDFLUSH */
7734 key_spdadd, /* SADB_X_SPDSETIDX */
7735 NULL, /* SADB_X_SPDEXPIRE */
7736 key_spddelete2, /* SADB_X_SPDDELETE2 */
7737 };
7738
7739 /*
7740 * parse sadb_msg buffer to process PFKEYv2,
7741 * and create a data to response if needed.
7742 * I think to be dealed with mbuf directly.
7743 * IN:
7744 * msgp : pointer to pointer to a received buffer pulluped.
7745 * This is rewrited to response.
7746 * so : pointer to socket.
7747 * OUT:
7748 * length for buffer to send to user process.
7749 */
7750 int
key_parse(struct mbuf * m,struct socket * so)7751 key_parse(struct mbuf *m, struct socket *so)
7752 {
7753 struct sadb_msg *msg;
7754 struct sadb_msghdr mh;
7755 u_int orglen;
7756 int error;
7757 int target;
7758
7759 IPSEC_ASSERT(so != NULL, ("null socket"));
7760 IPSEC_ASSERT(m != NULL, ("null mbuf"));
7761
7762 if (m->m_len < sizeof(struct sadb_msg)) {
7763 m = m_pullup(m, sizeof(struct sadb_msg));
7764 if (!m)
7765 return ENOBUFS;
7766 }
7767 msg = mtod(m, struct sadb_msg *);
7768 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len);
7769 target = KEY_SENDUP_ONE;
7770
7771 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len != orglen) {
7772 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__));
7773 PFKEYSTAT_INC(out_invlen);
7774 error = EINVAL;
7775 goto senderror;
7776 }
7777
7778 if (msg->sadb_msg_version != PF_KEY_V2) {
7779 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n",
7780 __func__, msg->sadb_msg_version));
7781 PFKEYSTAT_INC(out_invver);
7782 error = EINVAL;
7783 goto senderror;
7784 }
7785
7786 if (msg->sadb_msg_type > SADB_MAX) {
7787 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
7788 __func__, msg->sadb_msg_type));
7789 PFKEYSTAT_INC(out_invmsgtype);
7790 error = EINVAL;
7791 goto senderror;
7792 }
7793
7794 /* for old-fashioned code - should be nuked */
7795 if (m->m_pkthdr.len > MCLBYTES) {
7796 m_freem(m);
7797 return ENOBUFS;
7798 }
7799 if (m->m_next) {
7800 struct mbuf *n;
7801
7802 MGETHDR(n, M_NOWAIT, MT_DATA);
7803 if (n && m->m_pkthdr.len > MHLEN) {
7804 if (!(MCLGET(n, M_NOWAIT))) {
7805 m_free(n);
7806 n = NULL;
7807 }
7808 }
7809 if (!n) {
7810 m_freem(m);
7811 return ENOBUFS;
7812 }
7813 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
7814 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len;
7815 n->m_next = NULL;
7816 m_freem(m);
7817 m = n;
7818 }
7819
7820 /* align the mbuf chain so that extensions are in contiguous region. */
7821 error = key_align(m, &mh);
7822 if (error)
7823 return error;
7824
7825 msg = mh.msg;
7826
7827 /* We use satype as scope mask for spddump */
7828 if (msg->sadb_msg_type == SADB_X_SPDDUMP) {
7829 switch (msg->sadb_msg_satype) {
7830 case IPSEC_POLICYSCOPE_ANY:
7831 case IPSEC_POLICYSCOPE_GLOBAL:
7832 case IPSEC_POLICYSCOPE_IFNET:
7833 case IPSEC_POLICYSCOPE_PCB:
7834 break;
7835 default:
7836 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
7837 __func__, msg->sadb_msg_type));
7838 PFKEYSTAT_INC(out_invsatype);
7839 error = EINVAL;
7840 goto senderror;
7841 }
7842 } else {
7843 switch (msg->sadb_msg_satype) { /* check SA type */
7844 case SADB_SATYPE_UNSPEC:
7845 switch (msg->sadb_msg_type) {
7846 case SADB_GETSPI:
7847 case SADB_UPDATE:
7848 case SADB_ADD:
7849 case SADB_DELETE:
7850 case SADB_GET:
7851 case SADB_ACQUIRE:
7852 case SADB_EXPIRE:
7853 ipseclog((LOG_DEBUG, "%s: must specify satype "
7854 "when msg type=%u.\n", __func__,
7855 msg->sadb_msg_type));
7856 PFKEYSTAT_INC(out_invsatype);
7857 error = EINVAL;
7858 goto senderror;
7859 }
7860 break;
7861 case SADB_SATYPE_AH:
7862 case SADB_SATYPE_ESP:
7863 case SADB_X_SATYPE_IPCOMP:
7864 case SADB_X_SATYPE_TCPSIGNATURE:
7865 switch (msg->sadb_msg_type) {
7866 case SADB_X_SPDADD:
7867 case SADB_X_SPDDELETE:
7868 case SADB_X_SPDGET:
7869 case SADB_X_SPDFLUSH:
7870 case SADB_X_SPDSETIDX:
7871 case SADB_X_SPDUPDATE:
7872 case SADB_X_SPDDELETE2:
7873 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
7874 __func__, msg->sadb_msg_type));
7875 PFKEYSTAT_INC(out_invsatype);
7876 error = EINVAL;
7877 goto senderror;
7878 }
7879 break;
7880 case SADB_SATYPE_RSVP:
7881 case SADB_SATYPE_OSPFV2:
7882 case SADB_SATYPE_RIPV2:
7883 case SADB_SATYPE_MIP:
7884 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n",
7885 __func__, msg->sadb_msg_satype));
7886 PFKEYSTAT_INC(out_invsatype);
7887 error = EOPNOTSUPP;
7888 goto senderror;
7889 case 1: /* XXX: What does it do? */
7890 if (msg->sadb_msg_type == SADB_X_PROMISC)
7891 break;
7892 /*FALLTHROUGH*/
7893 default:
7894 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
7895 __func__, msg->sadb_msg_satype));
7896 PFKEYSTAT_INC(out_invsatype);
7897 error = EINVAL;
7898 goto senderror;
7899 }
7900 }
7901
7902 /* check field of upper layer protocol and address family */
7903 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL
7904 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) {
7905 struct sadb_address *src0, *dst0;
7906 u_int plen;
7907
7908 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]);
7909 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]);
7910
7911 /* check upper layer protocol */
7912 if (src0->sadb_address_proto != dst0->sadb_address_proto) {
7913 ipseclog((LOG_DEBUG, "%s: upper layer protocol "
7914 "mismatched.\n", __func__));
7915 PFKEYSTAT_INC(out_invaddr);
7916 error = EINVAL;
7917 goto senderror;
7918 }
7919
7920 /* check family */
7921 if (PFKEY_ADDR_SADDR(src0)->sa_family !=
7922 PFKEY_ADDR_SADDR(dst0)->sa_family) {
7923 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n",
7924 __func__));
7925 PFKEYSTAT_INC(out_invaddr);
7926 error = EINVAL;
7927 goto senderror;
7928 }
7929 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
7930 PFKEY_ADDR_SADDR(dst0)->sa_len) {
7931 ipseclog((LOG_DEBUG, "%s: address struct size "
7932 "mismatched.\n", __func__));
7933 PFKEYSTAT_INC(out_invaddr);
7934 error = EINVAL;
7935 goto senderror;
7936 }
7937
7938 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
7939 case AF_INET:
7940 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
7941 sizeof(struct sockaddr_in)) {
7942 PFKEYSTAT_INC(out_invaddr);
7943 error = EINVAL;
7944 goto senderror;
7945 }
7946 break;
7947 case AF_INET6:
7948 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
7949 sizeof(struct sockaddr_in6)) {
7950 PFKEYSTAT_INC(out_invaddr);
7951 error = EINVAL;
7952 goto senderror;
7953 }
7954 break;
7955 default:
7956 ipseclog((LOG_DEBUG, "%s: unsupported address family\n",
7957 __func__));
7958 PFKEYSTAT_INC(out_invaddr);
7959 error = EAFNOSUPPORT;
7960 goto senderror;
7961 }
7962
7963 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
7964 case AF_INET:
7965 plen = sizeof(struct in_addr) << 3;
7966 break;
7967 case AF_INET6:
7968 plen = sizeof(struct in6_addr) << 3;
7969 break;
7970 default:
7971 plen = 0; /*fool gcc*/
7972 break;
7973 }
7974
7975 /* check max prefix length */
7976 if (src0->sadb_address_prefixlen > plen ||
7977 dst0->sadb_address_prefixlen > plen) {
7978 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n",
7979 __func__));
7980 PFKEYSTAT_INC(out_invaddr);
7981 error = EINVAL;
7982 goto senderror;
7983 }
7984
7985 /*
7986 * prefixlen == 0 is valid because there can be a case when
7987 * all addresses are matched.
7988 */
7989 }
7990
7991 if (msg->sadb_msg_type >= nitems(key_typesw) ||
7992 key_typesw[msg->sadb_msg_type] == NULL) {
7993 PFKEYSTAT_INC(out_invmsgtype);
7994 error = EINVAL;
7995 goto senderror;
7996 }
7997
7998 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh);
7999
8000 senderror:
8001 msg->sadb_msg_errno = error;
8002 return key_sendup_mbuf(so, m, target);
8003 }
8004
8005 static int
key_senderror(struct socket * so,struct mbuf * m,int code)8006 key_senderror(struct socket *so, struct mbuf *m, int code)
8007 {
8008 struct sadb_msg *msg;
8009
8010 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
8011 ("mbuf too small, len %u", m->m_len));
8012
8013 msg = mtod(m, struct sadb_msg *);
8014 msg->sadb_msg_errno = code;
8015 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
8016 }
8017
8018 /*
8019 * set the pointer to each header into message buffer.
8020 * m will be freed on error.
8021 * XXX larger-than-MCLBYTES extension?
8022 */
8023 static int
key_align(struct mbuf * m,struct sadb_msghdr * mhp)8024 key_align(struct mbuf *m, struct sadb_msghdr *mhp)
8025 {
8026 struct mbuf *n;
8027 struct sadb_ext *ext;
8028 size_t off, end;
8029 int extlen;
8030 int toff;
8031
8032 IPSEC_ASSERT(m != NULL, ("null mbuf"));
8033 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
8034 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
8035 ("mbuf too small, len %u", m->m_len));
8036
8037 /* initialize */
8038 bzero(mhp, sizeof(*mhp));
8039
8040 mhp->msg = mtod(m, struct sadb_msg *);
8041 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */
8042
8043 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
8044 extlen = end; /*just in case extlen is not updated*/
8045 for (off = sizeof(struct sadb_msg); off < end; off += extlen) {
8046 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff);
8047 if (!n) {
8048 /* m is already freed */
8049 return ENOBUFS;
8050 }
8051 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
8052
8053 /* set pointer */
8054 switch (ext->sadb_ext_type) {
8055 case SADB_EXT_SA:
8056 case SADB_EXT_ADDRESS_SRC:
8057 case SADB_EXT_ADDRESS_DST:
8058 case SADB_EXT_ADDRESS_PROXY:
8059 case SADB_EXT_LIFETIME_CURRENT:
8060 case SADB_EXT_LIFETIME_HARD:
8061 case SADB_EXT_LIFETIME_SOFT:
8062 case SADB_EXT_KEY_AUTH:
8063 case SADB_EXT_KEY_ENCRYPT:
8064 case SADB_EXT_IDENTITY_SRC:
8065 case SADB_EXT_IDENTITY_DST:
8066 case SADB_EXT_SENSITIVITY:
8067 case SADB_EXT_PROPOSAL:
8068 case SADB_EXT_SUPPORTED_AUTH:
8069 case SADB_EXT_SUPPORTED_ENCRYPT:
8070 case SADB_EXT_SPIRANGE:
8071 case SADB_X_EXT_POLICY:
8072 case SADB_X_EXT_SA2:
8073 case SADB_X_EXT_NAT_T_TYPE:
8074 case SADB_X_EXT_NAT_T_SPORT:
8075 case SADB_X_EXT_NAT_T_DPORT:
8076 case SADB_X_EXT_NAT_T_OAI:
8077 case SADB_X_EXT_NAT_T_OAR:
8078 case SADB_X_EXT_NAT_T_FRAG:
8079 case SADB_X_EXT_SA_REPLAY:
8080 case SADB_X_EXT_NEW_ADDRESS_SRC:
8081 case SADB_X_EXT_NEW_ADDRESS_DST:
8082 /* duplicate check */
8083 /*
8084 * XXX Are there duplication payloads of either
8085 * KEY_AUTH or KEY_ENCRYPT ?
8086 */
8087 if (mhp->ext[ext->sadb_ext_type] != NULL) {
8088 ipseclog((LOG_DEBUG, "%s: duplicate ext_type "
8089 "%u\n", __func__, ext->sadb_ext_type));
8090 m_freem(m);
8091 PFKEYSTAT_INC(out_dupext);
8092 return EINVAL;
8093 }
8094 break;
8095 default:
8096 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n",
8097 __func__, ext->sadb_ext_type));
8098 m_freem(m);
8099 PFKEYSTAT_INC(out_invexttype);
8100 return EINVAL;
8101 }
8102
8103 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
8104
8105 if (key_validate_ext(ext, extlen)) {
8106 m_freem(m);
8107 PFKEYSTAT_INC(out_invlen);
8108 return EINVAL;
8109 }
8110
8111 n = m_pulldown(m, off, extlen, &toff);
8112 if (!n) {
8113 /* m is already freed */
8114 return ENOBUFS;
8115 }
8116 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
8117
8118 mhp->ext[ext->sadb_ext_type] = ext;
8119 mhp->extoff[ext->sadb_ext_type] = off;
8120 mhp->extlen[ext->sadb_ext_type] = extlen;
8121 }
8122
8123 if (off != end) {
8124 m_freem(m);
8125 PFKEYSTAT_INC(out_invlen);
8126 return EINVAL;
8127 }
8128
8129 return 0;
8130 }
8131
8132 static int
key_validate_ext(const struct sadb_ext * ext,int len)8133 key_validate_ext(const struct sadb_ext *ext, int len)
8134 {
8135 const struct sockaddr *sa;
8136 enum { NONE, ADDR } checktype = NONE;
8137 int baselen = 0;
8138 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len);
8139
8140 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len))
8141 return EINVAL;
8142
8143 /* if it does not match minimum/maximum length, bail */
8144 if (ext->sadb_ext_type >= nitems(minsize) ||
8145 ext->sadb_ext_type >= nitems(maxsize))
8146 return EINVAL;
8147 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type])
8148 return EINVAL;
8149 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type])
8150 return EINVAL;
8151
8152 /* more checks based on sadb_ext_type XXX need more */
8153 switch (ext->sadb_ext_type) {
8154 case SADB_EXT_ADDRESS_SRC:
8155 case SADB_EXT_ADDRESS_DST:
8156 case SADB_EXT_ADDRESS_PROXY:
8157 case SADB_X_EXT_NAT_T_OAI:
8158 case SADB_X_EXT_NAT_T_OAR:
8159 case SADB_X_EXT_NEW_ADDRESS_SRC:
8160 case SADB_X_EXT_NEW_ADDRESS_DST:
8161 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
8162 checktype = ADDR;
8163 break;
8164 case SADB_EXT_IDENTITY_SRC:
8165 case SADB_EXT_IDENTITY_DST:
8166 if (((const struct sadb_ident *)ext)->sadb_ident_type ==
8167 SADB_X_IDENTTYPE_ADDR) {
8168 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident));
8169 checktype = ADDR;
8170 } else
8171 checktype = NONE;
8172 break;
8173 default:
8174 checktype = NONE;
8175 break;
8176 }
8177
8178 switch (checktype) {
8179 case NONE:
8180 break;
8181 case ADDR:
8182 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen);
8183 if (len < baselen + sal)
8184 return EINVAL;
8185 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len)
8186 return EINVAL;
8187 break;
8188 }
8189
8190 return 0;
8191 }
8192
8193 void
spdcache_init(void)8194 spdcache_init(void)
8195 {
8196 int i;
8197
8198 TUNABLE_INT_FETCH("net.key.spdcache.maxentries",
8199 &V_key_spdcache_maxentries);
8200 TUNABLE_INT_FETCH("net.key.spdcache.threshold",
8201 &V_key_spdcache_threshold);
8202
8203 if (V_key_spdcache_maxentries) {
8204 V_key_spdcache_maxentries = MAX(V_key_spdcache_maxentries,
8205 SPDCACHE_MAX_ENTRIES_PER_HASH);
8206 V_spdcachehashtbl = hashinit(V_key_spdcache_maxentries /
8207 SPDCACHE_MAX_ENTRIES_PER_HASH,
8208 M_IPSEC_SPDCACHE, &V_spdcachehash_mask);
8209 V_key_spdcache_maxentries = (V_spdcachehash_mask + 1)
8210 * SPDCACHE_MAX_ENTRIES_PER_HASH;
8211
8212 V_spdcache_lock = malloc(sizeof(struct mtx) *
8213 (V_spdcachehash_mask + 1),
8214 M_IPSEC_SPDCACHE, M_WAITOK|M_ZERO);
8215
8216 for (i = 0; i < V_spdcachehash_mask + 1; ++i)
8217 SPDCACHE_LOCK_INIT(i);
8218 }
8219 }
8220
8221 struct spdcache_entry *
spdcache_entry_alloc(const struct secpolicyindex * spidx,struct secpolicy * sp)8222 spdcache_entry_alloc(const struct secpolicyindex *spidx, struct secpolicy *sp)
8223 {
8224 struct spdcache_entry *entry;
8225
8226 entry = malloc(sizeof(struct spdcache_entry),
8227 M_IPSEC_SPDCACHE, M_NOWAIT|M_ZERO);
8228 if (entry == NULL)
8229 return NULL;
8230
8231 if (sp != NULL)
8232 SP_ADDREF(sp);
8233
8234 entry->spidx = *spidx;
8235 entry->sp = sp;
8236
8237 return (entry);
8238 }
8239
8240 void
spdcache_entry_free(struct spdcache_entry * entry)8241 spdcache_entry_free(struct spdcache_entry *entry)
8242 {
8243
8244 if (entry->sp != NULL)
8245 key_freesp(&entry->sp);
8246 free(entry, M_IPSEC_SPDCACHE);
8247 }
8248
8249 void
spdcache_clear(void)8250 spdcache_clear(void)
8251 {
8252 struct spdcache_entry *entry;
8253 int i;
8254
8255 for (i = 0; i < V_spdcachehash_mask + 1; ++i) {
8256 SPDCACHE_LOCK(i);
8257 while (!LIST_EMPTY(&V_spdcachehashtbl[i])) {
8258 entry = LIST_FIRST(&V_spdcachehashtbl[i]);
8259 LIST_REMOVE(entry, chain);
8260 spdcache_entry_free(entry);
8261 }
8262 SPDCACHE_UNLOCK(i);
8263 }
8264 }
8265
8266 #ifdef VIMAGE
8267 void
spdcache_destroy(void)8268 spdcache_destroy(void)
8269 {
8270 int i;
8271
8272 if (SPDCACHE_ENABLED()) {
8273 spdcache_clear();
8274 hashdestroy(V_spdcachehashtbl, M_IPSEC_SPDCACHE, V_spdcachehash_mask);
8275
8276 for (i = 0; i < V_spdcachehash_mask + 1; ++i)
8277 SPDCACHE_LOCK_DESTROY(i);
8278
8279 free(V_spdcache_lock, M_IPSEC_SPDCACHE);
8280 }
8281 }
8282 #endif
8283 void
key_init(void)8284 key_init(void)
8285 {
8286 int i;
8287
8288 for (i = 0; i < IPSEC_DIR_MAX; i++) {
8289 TAILQ_INIT(&V_sptree[i]);
8290 TAILQ_INIT(&V_sptree_ifnet[i]);
8291 }
8292
8293 V_key_lft_zone = uma_zcreate("IPsec SA lft_c",
8294 sizeof(uint64_t) * 2, NULL, NULL, NULL, NULL,
8295 UMA_ALIGN_PTR, UMA_ZONE_PCPU);
8296
8297 TAILQ_INIT(&V_sahtree);
8298 V_sphashtbl = hashinit(SPHASH_NHASH, M_IPSEC_SP, &V_sphash_mask);
8299 V_savhashtbl = hashinit(SAVHASH_NHASH, M_IPSEC_SA, &V_savhash_mask);
8300 V_sahaddrhashtbl = hashinit(SAHHASH_NHASH, M_IPSEC_SAH,
8301 &V_sahaddrhash_mask);
8302 V_acqaddrhashtbl = hashinit(ACQHASH_NHASH, M_IPSEC_SAQ,
8303 &V_acqaddrhash_mask);
8304 V_acqseqhashtbl = hashinit(ACQHASH_NHASH, M_IPSEC_SAQ,
8305 &V_acqseqhash_mask);
8306
8307 spdcache_init();
8308
8309 for (i = 0; i <= SADB_SATYPE_MAX; i++)
8310 LIST_INIT(&V_regtree[i]);
8311
8312 LIST_INIT(&V_acqtree);
8313 LIST_INIT(&V_spacqtree);
8314
8315 if (!IS_DEFAULT_VNET(curvnet))
8316 return;
8317
8318 SPTREE_LOCK_INIT();
8319 REGTREE_LOCK_INIT();
8320 SAHTREE_LOCK_INIT();
8321 ACQ_LOCK_INIT();
8322 SPACQ_LOCK_INIT();
8323
8324 #ifndef IPSEC_DEBUG2
8325 callout_init(&key_timer, 1);
8326 callout_reset(&key_timer, hz, key_timehandler, NULL);
8327 #endif /*IPSEC_DEBUG2*/
8328
8329 /* initialize key statistics */
8330 keystat.getspi_count = 1;
8331
8332 if (bootverbose)
8333 printf("IPsec: Initialized Security Association Processing.\n");
8334 }
8335
8336 #ifdef VIMAGE
8337 void
key_destroy(void)8338 key_destroy(void)
8339 {
8340 struct secashead_queue sahdrainq;
8341 struct secpolicy_queue drainq;
8342 struct secpolicy *sp, *nextsp;
8343 struct secacq *acq, *nextacq;
8344 struct secspacq *spacq, *nextspacq;
8345 struct secashead *sah;
8346 struct secasvar *sav;
8347 struct secreg *reg;
8348 int i;
8349
8350 /*
8351 * XXX: can we just call free() for each object without
8352 * walking through safe way with releasing references?
8353 */
8354 TAILQ_INIT(&drainq);
8355 SPTREE_WLOCK();
8356 for (i = 0; i < IPSEC_DIR_MAX; i++) {
8357 TAILQ_CONCAT(&drainq, &V_sptree[i], chain);
8358 TAILQ_CONCAT(&drainq, &V_sptree_ifnet[i], chain);
8359 }
8360 for (i = 0; i < V_sphash_mask + 1; i++)
8361 LIST_INIT(&V_sphashtbl[i]);
8362 SPTREE_WUNLOCK();
8363 spdcache_destroy();
8364
8365 sp = TAILQ_FIRST(&drainq);
8366 while (sp != NULL) {
8367 nextsp = TAILQ_NEXT(sp, chain);
8368 key_freesp(&sp);
8369 sp = nextsp;
8370 }
8371
8372 TAILQ_INIT(&sahdrainq);
8373 SAHTREE_WLOCK();
8374 TAILQ_CONCAT(&sahdrainq, &V_sahtree, chain);
8375 for (i = 0; i < V_savhash_mask + 1; i++)
8376 LIST_INIT(&V_savhashtbl[i]);
8377 for (i = 0; i < V_sahaddrhash_mask + 1; i++)
8378 LIST_INIT(&V_sahaddrhashtbl[i]);
8379 TAILQ_FOREACH(sah, &sahdrainq, chain) {
8380 sah->state = SADB_SASTATE_DEAD;
8381 TAILQ_FOREACH(sav, &sah->savtree_larval, chain) {
8382 sav->state = SADB_SASTATE_DEAD;
8383 }
8384 TAILQ_FOREACH(sav, &sah->savtree_alive, chain) {
8385 sav->state = SADB_SASTATE_DEAD;
8386 }
8387 }
8388 SAHTREE_WUNLOCK();
8389
8390 key_freesah_flushed(&sahdrainq);
8391 hashdestroy(V_sphashtbl, M_IPSEC_SP, V_sphash_mask);
8392 hashdestroy(V_savhashtbl, M_IPSEC_SA, V_savhash_mask);
8393 hashdestroy(V_sahaddrhashtbl, M_IPSEC_SAH, V_sahaddrhash_mask);
8394
8395 REGTREE_LOCK();
8396 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
8397 LIST_FOREACH(reg, &V_regtree[i], chain) {
8398 if (__LIST_CHAINED(reg)) {
8399 LIST_REMOVE(reg, chain);
8400 free(reg, M_IPSEC_SAR);
8401 break;
8402 }
8403 }
8404 }
8405 REGTREE_UNLOCK();
8406
8407 ACQ_LOCK();
8408 acq = LIST_FIRST(&V_acqtree);
8409 while (acq != NULL) {
8410 nextacq = LIST_NEXT(acq, chain);
8411 LIST_REMOVE(acq, chain);
8412 free(acq, M_IPSEC_SAQ);
8413 acq = nextacq;
8414 }
8415 for (i = 0; i < V_acqaddrhash_mask + 1; i++)
8416 LIST_INIT(&V_acqaddrhashtbl[i]);
8417 for (i = 0; i < V_acqseqhash_mask + 1; i++)
8418 LIST_INIT(&V_acqseqhashtbl[i]);
8419 ACQ_UNLOCK();
8420
8421 SPACQ_LOCK();
8422 for (spacq = LIST_FIRST(&V_spacqtree); spacq != NULL;
8423 spacq = nextspacq) {
8424 nextspacq = LIST_NEXT(spacq, chain);
8425 if (__LIST_CHAINED(spacq)) {
8426 LIST_REMOVE(spacq, chain);
8427 free(spacq, M_IPSEC_SAQ);
8428 }
8429 }
8430 SPACQ_UNLOCK();
8431 hashdestroy(V_acqaddrhashtbl, M_IPSEC_SAQ, V_acqaddrhash_mask);
8432 hashdestroy(V_acqseqhashtbl, M_IPSEC_SAQ, V_acqseqhash_mask);
8433 uma_zdestroy(V_key_lft_zone);
8434
8435 if (!IS_DEFAULT_VNET(curvnet))
8436 return;
8437 #ifndef IPSEC_DEBUG2
8438 callout_drain(&key_timer);
8439 #endif
8440 SPTREE_LOCK_DESTROY();
8441 REGTREE_LOCK_DESTROY();
8442 SAHTREE_LOCK_DESTROY();
8443 ACQ_LOCK_DESTROY();
8444 SPACQ_LOCK_DESTROY();
8445 }
8446 #endif
8447
8448 /* record data transfer on SA, and update timestamps */
8449 void
key_sa_recordxfer(struct secasvar * sav,struct mbuf * m)8450 key_sa_recordxfer(struct secasvar *sav, struct mbuf *m)
8451 {
8452 IPSEC_ASSERT(sav != NULL, ("Null secasvar"));
8453 IPSEC_ASSERT(m != NULL, ("Null mbuf"));
8454
8455 /*
8456 * XXX Currently, there is a difference of bytes size
8457 * between inbound and outbound processing.
8458 */
8459 counter_u64_add(sav->lft_c_bytes, m->m_pkthdr.len);
8460
8461 /*
8462 * We use the number of packets as the unit of
8463 * allocations. We increment the variable
8464 * whenever {esp,ah}_{in,out}put is called.
8465 */
8466 counter_u64_add(sav->lft_c_allocations, 1);
8467
8468 /*
8469 * NOTE: We record CURRENT usetime by using wall clock,
8470 * in seconds. HARD and SOFT lifetime are measured by the time
8471 * difference (again in seconds) from usetime.
8472 *
8473 * usetime
8474 * v expire expire
8475 * -----+-----+--------+---> t
8476 * <--------------> HARD
8477 * <-----> SOFT
8478 */
8479 if (sav->firstused == 0)
8480 sav->firstused = time_second;
8481 }
8482
8483 /*
8484 * Take one of the kernel's security keys and convert it into a PF_KEY
8485 * structure within an mbuf, suitable for sending up to a waiting
8486 * application in user land.
8487 *
8488 * IN:
8489 * src: A pointer to a kernel security key.
8490 * exttype: Which type of key this is. Refer to the PF_KEY data structures.
8491 * OUT:
8492 * a valid mbuf or NULL indicating an error
8493 *
8494 */
8495
8496 static struct mbuf *
key_setkey(struct seckey * src,uint16_t exttype)8497 key_setkey(struct seckey *src, uint16_t exttype)
8498 {
8499 struct mbuf *m;
8500 struct sadb_key *p;
8501 int len;
8502
8503 if (src == NULL)
8504 return NULL;
8505
8506 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src));
8507 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
8508 if (m == NULL)
8509 return NULL;
8510 m_align(m, len);
8511 m->m_len = len;
8512 p = mtod(m, struct sadb_key *);
8513 bzero(p, len);
8514 p->sadb_key_len = PFKEY_UNIT64(len);
8515 p->sadb_key_exttype = exttype;
8516 p->sadb_key_bits = src->bits;
8517 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src));
8518
8519 return m;
8520 }
8521
8522 /*
8523 * Take one of the kernel's lifetime data structures and convert it
8524 * into a PF_KEY structure within an mbuf, suitable for sending up to
8525 * a waiting application in user land.
8526 *
8527 * IN:
8528 * src: A pointer to a kernel lifetime structure.
8529 * exttype: Which type of lifetime this is. Refer to the PF_KEY
8530 * data structures for more information.
8531 * OUT:
8532 * a valid mbuf or NULL indicating an error
8533 *
8534 */
8535
8536 static struct mbuf *
key_setlifetime(struct seclifetime * src,uint16_t exttype)8537 key_setlifetime(struct seclifetime *src, uint16_t exttype)
8538 {
8539 struct mbuf *m = NULL;
8540 struct sadb_lifetime *p;
8541 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime));
8542
8543 if (src == NULL)
8544 return NULL;
8545
8546 m = m_get2(len, M_NOWAIT, MT_DATA, 0);
8547 if (m == NULL)
8548 return m;
8549 m_align(m, len);
8550 m->m_len = len;
8551 p = mtod(m, struct sadb_lifetime *);
8552
8553 bzero(p, len);
8554 p->sadb_lifetime_len = PFKEY_UNIT64(len);
8555 p->sadb_lifetime_exttype = exttype;
8556 p->sadb_lifetime_allocations = src->allocations;
8557 p->sadb_lifetime_bytes = src->bytes;
8558 p->sadb_lifetime_addtime = src->addtime;
8559 p->sadb_lifetime_usetime = src->usetime;
8560
8561 return m;
8562
8563 }
8564
8565 const struct enc_xform *
enc_algorithm_lookup(int alg)8566 enc_algorithm_lookup(int alg)
8567 {
8568 int i;
8569
8570 for (i = 0; i < nitems(supported_ealgs); i++)
8571 if (alg == supported_ealgs[i].sadb_alg)
8572 return (supported_ealgs[i].xform);
8573 return (NULL);
8574 }
8575
8576 const struct auth_hash *
auth_algorithm_lookup(int alg)8577 auth_algorithm_lookup(int alg)
8578 {
8579 int i;
8580
8581 for (i = 0; i < nitems(supported_aalgs); i++)
8582 if (alg == supported_aalgs[i].sadb_alg)
8583 return (supported_aalgs[i].xform);
8584 return (NULL);
8585 }
8586
8587 const struct comp_algo *
comp_algorithm_lookup(int alg)8588 comp_algorithm_lookup(int alg)
8589 {
8590 int i;
8591
8592 for (i = 0; i < nitems(supported_calgs); i++)
8593 if (alg == supported_calgs[i].sadb_alg)
8594 return (supported_calgs[i].xform);
8595 return (NULL);
8596 }
8597
8598